xref: /linux/net/sctp/socket.c (revision a3a02a52bcfcbcc4a637d4b68bf1bc391c9fad02)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* SCTP kernel implementation
3  * (C) Copyright IBM Corp. 2001, 2004
4  * Copyright (c) 1999-2000 Cisco, Inc.
5  * Copyright (c) 1999-2001 Motorola, Inc.
6  * Copyright (c) 2001-2003 Intel Corp.
7  * Copyright (c) 2001-2002 Nokia, Inc.
8  * Copyright (c) 2001 La Monte H.P. Yarroll
9  *
10  * This file is part of the SCTP kernel implementation
11  *
12  * These functions interface with the sockets layer to implement the
13  * SCTP Extensions for the Sockets API.
14  *
15  * Note that the descriptions from the specification are USER level
16  * functions--this file is the functions which populate the struct proto
17  * for SCTP which is the BOTTOM of the sockets interface.
18  *
19  * Please send any bug reports or fixes you make to the
20  * email address(es):
21  *    lksctp developers <linux-sctp@vger.kernel.org>
22  *
23  * Written or modified by:
24  *    La Monte H.P. Yarroll <piggy@acm.org>
25  *    Narasimha Budihal     <narsi@refcode.org>
26  *    Karl Knutson          <karl@athena.chicago.il.us>
27  *    Jon Grimm             <jgrimm@us.ibm.com>
28  *    Xingang Guo           <xingang.guo@intel.com>
29  *    Daisy Chang           <daisyc@us.ibm.com>
30  *    Sridhar Samudrala     <samudrala@us.ibm.com>
31  *    Inaky Perez-Gonzalez  <inaky.gonzalez@intel.com>
32  *    Ardelle Fan	    <ardelle.fan@intel.com>
33  *    Ryan Layer	    <rmlayer@us.ibm.com>
34  *    Anup Pemmaiah         <pemmaiah@cc.usu.edu>
35  *    Kevin Gao             <kevin.gao@intel.com>
36  */
37 
38 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
39 
40 #include <crypto/hash.h>
41 #include <linux/types.h>
42 #include <linux/kernel.h>
43 #include <linux/wait.h>
44 #include <linux/time.h>
45 #include <linux/sched/signal.h>
46 #include <linux/ip.h>
47 #include <linux/capability.h>
48 #include <linux/fcntl.h>
49 #include <linux/poll.h>
50 #include <linux/init.h>
51 #include <linux/slab.h>
52 #include <linux/file.h>
53 #include <linux/compat.h>
54 #include <linux/rhashtable.h>
55 
56 #include <net/ip.h>
57 #include <net/icmp.h>
58 #include <net/route.h>
59 #include <net/ipv6.h>
60 #include <net/inet_common.h>
61 #include <net/busy_poll.h>
62 #include <trace/events/sock.h>
63 
64 #include <linux/socket.h> /* for sa_family_t */
65 #include <linux/export.h>
66 #include <net/sock.h>
67 #include <net/sctp/sctp.h>
68 #include <net/sctp/sm.h>
69 #include <net/sctp/stream_sched.h>
70 #include <net/rps.h>
71 
72 /* Forward declarations for internal helper functions. */
73 static bool sctp_writeable(const struct sock *sk);
74 static void sctp_wfree(struct sk_buff *skb);
75 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
76 				size_t msg_len);
77 static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p);
78 static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p);
79 static int sctp_wait_for_accept(struct sock *sk, long timeo);
80 static void sctp_wait_for_close(struct sock *sk, long timeo);
81 static void sctp_destruct_sock(struct sock *sk);
82 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
83 					union sctp_addr *addr, int len);
84 static int sctp_bindx_add(struct sock *, struct sockaddr *, int);
85 static int sctp_bindx_rem(struct sock *, struct sockaddr *, int);
86 static int sctp_send_asconf_add_ip(struct sock *, struct sockaddr *, int);
87 static int sctp_send_asconf_del_ip(struct sock *, struct sockaddr *, int);
88 static int sctp_send_asconf(struct sctp_association *asoc,
89 			    struct sctp_chunk *chunk);
90 static int sctp_do_bind(struct sock *, union sctp_addr *, int);
91 static int sctp_autobind(struct sock *sk);
92 static int sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
93 			     struct sctp_association *assoc,
94 			     enum sctp_socket_type type);
95 
96 static unsigned long sctp_memory_pressure;
97 static atomic_long_t sctp_memory_allocated;
98 static DEFINE_PER_CPU(int, sctp_memory_per_cpu_fw_alloc);
99 struct percpu_counter sctp_sockets_allocated;
100 
101 static void sctp_enter_memory_pressure(struct sock *sk)
102 {
103 	WRITE_ONCE(sctp_memory_pressure, 1);
104 }
105 
106 
107 /* Get the sndbuf space available at the time on the association.  */
108 static inline int sctp_wspace(struct sctp_association *asoc)
109 {
110 	struct sock *sk = asoc->base.sk;
111 
112 	return asoc->ep->sndbuf_policy ? sk->sk_sndbuf - asoc->sndbuf_used
113 				       : sk_stream_wspace(sk);
114 }
115 
116 /* Increment the used sndbuf space count of the corresponding association by
117  * the size of the outgoing data chunk.
118  * Also, set the skb destructor for sndbuf accounting later.
119  *
120  * Since it is always 1-1 between chunk and skb, and also a new skb is always
121  * allocated for chunk bundling in sctp_packet_transmit(), we can use the
122  * destructor in the data chunk skb for the purpose of the sndbuf space
123  * tracking.
124  */
125 static inline void sctp_set_owner_w(struct sctp_chunk *chunk)
126 {
127 	struct sctp_association *asoc = chunk->asoc;
128 	struct sock *sk = asoc->base.sk;
129 
130 	/* The sndbuf space is tracked per association.  */
131 	sctp_association_hold(asoc);
132 
133 	if (chunk->shkey)
134 		sctp_auth_shkey_hold(chunk->shkey);
135 
136 	skb_set_owner_w(chunk->skb, sk);
137 
138 	chunk->skb->destructor = sctp_wfree;
139 	/* Save the chunk pointer in skb for sctp_wfree to use later.  */
140 	skb_shinfo(chunk->skb)->destructor_arg = chunk;
141 
142 	refcount_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
143 	asoc->sndbuf_used += chunk->skb->truesize + sizeof(struct sctp_chunk);
144 	sk_wmem_queued_add(sk, chunk->skb->truesize + sizeof(struct sctp_chunk));
145 	sk_mem_charge(sk, chunk->skb->truesize);
146 }
147 
148 static void sctp_clear_owner_w(struct sctp_chunk *chunk)
149 {
150 	skb_orphan(chunk->skb);
151 }
152 
153 #define traverse_and_process()	\
154 do {				\
155 	msg = chunk->msg;	\
156 	if (msg == prev_msg)	\
157 		continue;	\
158 	list_for_each_entry(c, &msg->chunks, frag_list) {	\
159 		if ((clear && asoc->base.sk == c->skb->sk) ||	\
160 		    (!clear && asoc->base.sk != c->skb->sk))	\
161 			cb(c);	\
162 	}			\
163 	prev_msg = msg;		\
164 } while (0)
165 
166 static void sctp_for_each_tx_datachunk(struct sctp_association *asoc,
167 				       bool clear,
168 				       void (*cb)(struct sctp_chunk *))
169 
170 {
171 	struct sctp_datamsg *msg, *prev_msg = NULL;
172 	struct sctp_outq *q = &asoc->outqueue;
173 	struct sctp_chunk *chunk, *c;
174 	struct sctp_transport *t;
175 
176 	list_for_each_entry(t, &asoc->peer.transport_addr_list, transports)
177 		list_for_each_entry(chunk, &t->transmitted, transmitted_list)
178 			traverse_and_process();
179 
180 	list_for_each_entry(chunk, &q->retransmit, transmitted_list)
181 		traverse_and_process();
182 
183 	list_for_each_entry(chunk, &q->sacked, transmitted_list)
184 		traverse_and_process();
185 
186 	list_for_each_entry(chunk, &q->abandoned, transmitted_list)
187 		traverse_and_process();
188 
189 	list_for_each_entry(chunk, &q->out_chunk_list, list)
190 		traverse_and_process();
191 }
192 
193 static void sctp_for_each_rx_skb(struct sctp_association *asoc, struct sock *sk,
194 				 void (*cb)(struct sk_buff *, struct sock *))
195 
196 {
197 	struct sk_buff *skb, *tmp;
198 
199 	sctp_skb_for_each(skb, &asoc->ulpq.lobby, tmp)
200 		cb(skb, sk);
201 
202 	sctp_skb_for_each(skb, &asoc->ulpq.reasm, tmp)
203 		cb(skb, sk);
204 
205 	sctp_skb_for_each(skb, &asoc->ulpq.reasm_uo, tmp)
206 		cb(skb, sk);
207 }
208 
209 /* Verify that this is a valid address. */
210 static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr,
211 				   int len)
212 {
213 	struct sctp_af *af;
214 
215 	/* Verify basic sockaddr. */
216 	af = sctp_sockaddr_af(sctp_sk(sk), addr, len);
217 	if (!af)
218 		return -EINVAL;
219 
220 	/* Is this a valid SCTP address?  */
221 	if (!af->addr_valid(addr, sctp_sk(sk), NULL))
222 		return -EINVAL;
223 
224 	if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr)))
225 		return -EINVAL;
226 
227 	return 0;
228 }
229 
230 /* Look up the association by its id.  If this is not a UDP-style
231  * socket, the ID field is always ignored.
232  */
233 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id)
234 {
235 	struct sctp_association *asoc = NULL;
236 
237 	/* If this is not a UDP-style socket, assoc id should be ignored. */
238 	if (!sctp_style(sk, UDP)) {
239 		/* Return NULL if the socket state is not ESTABLISHED. It
240 		 * could be a TCP-style listening socket or a socket which
241 		 * hasn't yet called connect() to establish an association.
242 		 */
243 		if (!sctp_sstate(sk, ESTABLISHED) && !sctp_sstate(sk, CLOSING))
244 			return NULL;
245 
246 		/* Get the first and the only association from the list. */
247 		if (!list_empty(&sctp_sk(sk)->ep->asocs))
248 			asoc = list_entry(sctp_sk(sk)->ep->asocs.next,
249 					  struct sctp_association, asocs);
250 		return asoc;
251 	}
252 
253 	/* Otherwise this is a UDP-style socket. */
254 	if (id <= SCTP_ALL_ASSOC)
255 		return NULL;
256 
257 	spin_lock_bh(&sctp_assocs_id_lock);
258 	asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id);
259 	if (asoc && (asoc->base.sk != sk || asoc->base.dead))
260 		asoc = NULL;
261 	spin_unlock_bh(&sctp_assocs_id_lock);
262 
263 	return asoc;
264 }
265 
266 /* Look up the transport from an address and an assoc id. If both address and
267  * id are specified, the associations matching the address and the id should be
268  * the same.
269  */
270 static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
271 					      struct sockaddr_storage *addr,
272 					      sctp_assoc_t id)
273 {
274 	struct sctp_association *addr_asoc = NULL, *id_asoc = NULL;
275 	struct sctp_af *af = sctp_get_af_specific(addr->ss_family);
276 	union sctp_addr *laddr = (union sctp_addr *)addr;
277 	struct sctp_transport *transport;
278 
279 	if (!af || sctp_verify_addr(sk, laddr, af->sockaddr_len))
280 		return NULL;
281 
282 	addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep,
283 					       laddr,
284 					       &transport);
285 
286 	if (!addr_asoc)
287 		return NULL;
288 
289 	id_asoc = sctp_id2assoc(sk, id);
290 	if (id_asoc && (id_asoc != addr_asoc))
291 		return NULL;
292 
293 	sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
294 						(union sctp_addr *)addr);
295 
296 	return transport;
297 }
298 
299 /* API 3.1.2 bind() - UDP Style Syntax
300  * The syntax of bind() is,
301  *
302  *   ret = bind(int sd, struct sockaddr *addr, int addrlen);
303  *
304  *   sd      - the socket descriptor returned by socket().
305  *   addr    - the address structure (struct sockaddr_in or struct
306  *             sockaddr_in6 [RFC 2553]),
307  *   addr_len - the size of the address structure.
308  */
309 static int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len)
310 {
311 	int retval = 0;
312 
313 	lock_sock(sk);
314 
315 	pr_debug("%s: sk:%p, addr:%p, addr_len:%d\n", __func__, sk,
316 		 addr, addr_len);
317 
318 	/* Disallow binding twice. */
319 	if (!sctp_sk(sk)->ep->base.bind_addr.port)
320 		retval = sctp_do_bind(sk, (union sctp_addr *)addr,
321 				      addr_len);
322 	else
323 		retval = -EINVAL;
324 
325 	release_sock(sk);
326 
327 	return retval;
328 }
329 
330 static int sctp_get_port_local(struct sock *, union sctp_addr *);
331 
332 /* Verify this is a valid sockaddr. */
333 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
334 					union sctp_addr *addr, int len)
335 {
336 	struct sctp_af *af;
337 
338 	/* Check minimum size.  */
339 	if (len < sizeof (struct sockaddr))
340 		return NULL;
341 
342 	if (!opt->pf->af_supported(addr->sa.sa_family, opt))
343 		return NULL;
344 
345 	if (addr->sa.sa_family == AF_INET6) {
346 		if (len < SIN6_LEN_RFC2133)
347 			return NULL;
348 		/* V4 mapped address are really of AF_INET family */
349 		if (ipv6_addr_v4mapped(&addr->v6.sin6_addr) &&
350 		    !opt->pf->af_supported(AF_INET, opt))
351 			return NULL;
352 	}
353 
354 	/* If we get this far, af is valid. */
355 	af = sctp_get_af_specific(addr->sa.sa_family);
356 
357 	if (len < af->sockaddr_len)
358 		return NULL;
359 
360 	return af;
361 }
362 
363 static void sctp_auto_asconf_init(struct sctp_sock *sp)
364 {
365 	struct net *net = sock_net(&sp->inet.sk);
366 
367 	if (net->sctp.default_auto_asconf) {
368 		spin_lock_bh(&net->sctp.addr_wq_lock);
369 		list_add_tail(&sp->auto_asconf_list, &net->sctp.auto_asconf_splist);
370 		spin_unlock_bh(&net->sctp.addr_wq_lock);
371 		sp->do_auto_asconf = 1;
372 	}
373 }
374 
375 /* Bind a local address either to an endpoint or to an association.  */
376 static int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
377 {
378 	struct net *net = sock_net(sk);
379 	struct sctp_sock *sp = sctp_sk(sk);
380 	struct sctp_endpoint *ep = sp->ep;
381 	struct sctp_bind_addr *bp = &ep->base.bind_addr;
382 	struct sctp_af *af;
383 	unsigned short snum;
384 	int ret = 0;
385 
386 	/* Common sockaddr verification. */
387 	af = sctp_sockaddr_af(sp, addr, len);
388 	if (!af) {
389 		pr_debug("%s: sk:%p, newaddr:%p, len:%d EINVAL\n",
390 			 __func__, sk, addr, len);
391 		return -EINVAL;
392 	}
393 
394 	snum = ntohs(addr->v4.sin_port);
395 
396 	pr_debug("%s: sk:%p, new addr:%pISc, port:%d, new port:%d, len:%d\n",
397 		 __func__, sk, &addr->sa, bp->port, snum, len);
398 
399 	/* PF specific bind() address verification. */
400 	if (!sp->pf->bind_verify(sp, addr))
401 		return -EADDRNOTAVAIL;
402 
403 	/* We must either be unbound, or bind to the same port.
404 	 * It's OK to allow 0 ports if we are already bound.
405 	 * We'll just inhert an already bound port in this case
406 	 */
407 	if (bp->port) {
408 		if (!snum)
409 			snum = bp->port;
410 		else if (snum != bp->port) {
411 			pr_debug("%s: new port %d doesn't match existing port "
412 				 "%d\n", __func__, snum, bp->port);
413 			return -EINVAL;
414 		}
415 	}
416 
417 	if (snum && inet_port_requires_bind_service(net, snum) &&
418 	    !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
419 		return -EACCES;
420 
421 	/* See if the address matches any of the addresses we may have
422 	 * already bound before checking against other endpoints.
423 	 */
424 	if (sctp_bind_addr_match(bp, addr, sp))
425 		return -EINVAL;
426 
427 	/* Make sure we are allowed to bind here.
428 	 * The function sctp_get_port_local() does duplicate address
429 	 * detection.
430 	 */
431 	addr->v4.sin_port = htons(snum);
432 	if (sctp_get_port_local(sk, addr))
433 		return -EADDRINUSE;
434 
435 	/* Refresh ephemeral port.  */
436 	if (!bp->port) {
437 		bp->port = inet_sk(sk)->inet_num;
438 		sctp_auto_asconf_init(sp);
439 	}
440 
441 	/* Add the address to the bind address list.
442 	 * Use GFP_ATOMIC since BHs will be disabled.
443 	 */
444 	ret = sctp_add_bind_addr(bp, addr, af->sockaddr_len,
445 				 SCTP_ADDR_SRC, GFP_ATOMIC);
446 
447 	if (ret) {
448 		sctp_put_port(sk);
449 		return ret;
450 	}
451 	/* Copy back into socket for getsockname() use. */
452 	inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num);
453 	sp->pf->to_sk_saddr(addr, sk);
454 
455 	return ret;
456 }
457 
458  /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
459  *
460  * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
461  * at any one time.  If a sender, after sending an ASCONF chunk, decides
462  * it needs to transfer another ASCONF Chunk, it MUST wait until the
463  * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
464  * subsequent ASCONF. Note this restriction binds each side, so at any
465  * time two ASCONF may be in-transit on any given association (one sent
466  * from each endpoint).
467  */
468 static int sctp_send_asconf(struct sctp_association *asoc,
469 			    struct sctp_chunk *chunk)
470 {
471 	int retval = 0;
472 
473 	/* If there is an outstanding ASCONF chunk, queue it for later
474 	 * transmission.
475 	 */
476 	if (asoc->addip_last_asconf) {
477 		list_add_tail(&chunk->list, &asoc->addip_chunk_list);
478 		goto out;
479 	}
480 
481 	/* Hold the chunk until an ASCONF_ACK is received. */
482 	sctp_chunk_hold(chunk);
483 	retval = sctp_primitive_ASCONF(asoc->base.net, asoc, chunk);
484 	if (retval)
485 		sctp_chunk_free(chunk);
486 	else
487 		asoc->addip_last_asconf = chunk;
488 
489 out:
490 	return retval;
491 }
492 
493 /* Add a list of addresses as bind addresses to local endpoint or
494  * association.
495  *
496  * Basically run through each address specified in the addrs/addrcnt
497  * array/length pair, determine if it is IPv6 or IPv4 and call
498  * sctp_do_bind() on it.
499  *
500  * If any of them fails, then the operation will be reversed and the
501  * ones that were added will be removed.
502  *
503  * Only sctp_setsockopt_bindx() is supposed to call this function.
504  */
505 static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
506 {
507 	int cnt;
508 	int retval = 0;
509 	void *addr_buf;
510 	struct sockaddr *sa_addr;
511 	struct sctp_af *af;
512 
513 	pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", __func__, sk,
514 		 addrs, addrcnt);
515 
516 	addr_buf = addrs;
517 	for (cnt = 0; cnt < addrcnt; cnt++) {
518 		/* The list may contain either IPv4 or IPv6 address;
519 		 * determine the address length for walking thru the list.
520 		 */
521 		sa_addr = addr_buf;
522 		af = sctp_get_af_specific(sa_addr->sa_family);
523 		if (!af) {
524 			retval = -EINVAL;
525 			goto err_bindx_add;
526 		}
527 
528 		retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr,
529 				      af->sockaddr_len);
530 
531 		addr_buf += af->sockaddr_len;
532 
533 err_bindx_add:
534 		if (retval < 0) {
535 			/* Failed. Cleanup the ones that have been added */
536 			if (cnt > 0)
537 				sctp_bindx_rem(sk, addrs, cnt);
538 			return retval;
539 		}
540 	}
541 
542 	return retval;
543 }
544 
545 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
546  * associations that are part of the endpoint indicating that a list of local
547  * addresses are added to the endpoint.
548  *
549  * If any of the addresses is already in the bind address list of the
550  * association, we do not send the chunk for that association.  But it will not
551  * affect other associations.
552  *
553  * Only sctp_setsockopt_bindx() is supposed to call this function.
554  */
555 static int sctp_send_asconf_add_ip(struct sock		*sk,
556 				   struct sockaddr	*addrs,
557 				   int 			addrcnt)
558 {
559 	struct sctp_sock		*sp;
560 	struct sctp_endpoint		*ep;
561 	struct sctp_association		*asoc;
562 	struct sctp_bind_addr		*bp;
563 	struct sctp_chunk		*chunk;
564 	struct sctp_sockaddr_entry	*laddr;
565 	union sctp_addr			*addr;
566 	union sctp_addr			saveaddr;
567 	void				*addr_buf;
568 	struct sctp_af			*af;
569 	struct list_head		*p;
570 	int 				i;
571 	int 				retval = 0;
572 
573 	sp = sctp_sk(sk);
574 	ep = sp->ep;
575 
576 	if (!ep->asconf_enable)
577 		return retval;
578 
579 	pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
580 		 __func__, sk, addrs, addrcnt);
581 
582 	list_for_each_entry(asoc, &ep->asocs, asocs) {
583 		if (!asoc->peer.asconf_capable)
584 			continue;
585 
586 		if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
587 			continue;
588 
589 		if (!sctp_state(asoc, ESTABLISHED))
590 			continue;
591 
592 		/* Check if any address in the packed array of addresses is
593 		 * in the bind address list of the association. If so,
594 		 * do not send the asconf chunk to its peer, but continue with
595 		 * other associations.
596 		 */
597 		addr_buf = addrs;
598 		for (i = 0; i < addrcnt; i++) {
599 			addr = addr_buf;
600 			af = sctp_get_af_specific(addr->v4.sin_family);
601 			if (!af) {
602 				retval = -EINVAL;
603 				goto out;
604 			}
605 
606 			if (sctp_assoc_lookup_laddr(asoc, addr))
607 				break;
608 
609 			addr_buf += af->sockaddr_len;
610 		}
611 		if (i < addrcnt)
612 			continue;
613 
614 		/* Use the first valid address in bind addr list of
615 		 * association as Address Parameter of ASCONF CHUNK.
616 		 */
617 		bp = &asoc->base.bind_addr;
618 		p = bp->address_list.next;
619 		laddr = list_entry(p, struct sctp_sockaddr_entry, list);
620 		chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
621 						   addrcnt, SCTP_PARAM_ADD_IP);
622 		if (!chunk) {
623 			retval = -ENOMEM;
624 			goto out;
625 		}
626 
627 		/* Add the new addresses to the bind address list with
628 		 * use_as_src set to 0.
629 		 */
630 		addr_buf = addrs;
631 		for (i = 0; i < addrcnt; i++) {
632 			addr = addr_buf;
633 			af = sctp_get_af_specific(addr->v4.sin_family);
634 			memcpy(&saveaddr, addr, af->sockaddr_len);
635 			retval = sctp_add_bind_addr(bp, &saveaddr,
636 						    sizeof(saveaddr),
637 						    SCTP_ADDR_NEW, GFP_ATOMIC);
638 			addr_buf += af->sockaddr_len;
639 		}
640 		if (asoc->src_out_of_asoc_ok) {
641 			struct sctp_transport *trans;
642 
643 			list_for_each_entry(trans,
644 			    &asoc->peer.transport_addr_list, transports) {
645 				trans->cwnd = min(4*asoc->pathmtu, max_t(__u32,
646 				    2*asoc->pathmtu, 4380));
647 				trans->ssthresh = asoc->peer.i.a_rwnd;
648 				trans->rto = asoc->rto_initial;
649 				sctp_max_rto(asoc, trans);
650 				trans->rtt = trans->srtt = trans->rttvar = 0;
651 				/* Clear the source and route cache */
652 				sctp_transport_route(trans, NULL,
653 						     sctp_sk(asoc->base.sk));
654 			}
655 		}
656 		retval = sctp_send_asconf(asoc, chunk);
657 	}
658 
659 out:
660 	return retval;
661 }
662 
663 /* Remove a list of addresses from bind addresses list.  Do not remove the
664  * last address.
665  *
666  * Basically run through each address specified in the addrs/addrcnt
667  * array/length pair, determine if it is IPv6 or IPv4 and call
668  * sctp_del_bind() on it.
669  *
670  * If any of them fails, then the operation will be reversed and the
671  * ones that were removed will be added back.
672  *
673  * At least one address has to be left; if only one address is
674  * available, the operation will return -EBUSY.
675  *
676  * Only sctp_setsockopt_bindx() is supposed to call this function.
677  */
678 static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
679 {
680 	struct sctp_sock *sp = sctp_sk(sk);
681 	struct sctp_endpoint *ep = sp->ep;
682 	int cnt;
683 	struct sctp_bind_addr *bp = &ep->base.bind_addr;
684 	int retval = 0;
685 	void *addr_buf;
686 	union sctp_addr *sa_addr;
687 	struct sctp_af *af;
688 
689 	pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
690 		 __func__, sk, addrs, addrcnt);
691 
692 	addr_buf = addrs;
693 	for (cnt = 0; cnt < addrcnt; cnt++) {
694 		/* If the bind address list is empty or if there is only one
695 		 * bind address, there is nothing more to be removed (we need
696 		 * at least one address here).
697 		 */
698 		if (list_empty(&bp->address_list) ||
699 		    (sctp_list_single_entry(&bp->address_list))) {
700 			retval = -EBUSY;
701 			goto err_bindx_rem;
702 		}
703 
704 		sa_addr = addr_buf;
705 		af = sctp_get_af_specific(sa_addr->sa.sa_family);
706 		if (!af) {
707 			retval = -EINVAL;
708 			goto err_bindx_rem;
709 		}
710 
711 		if (!af->addr_valid(sa_addr, sp, NULL)) {
712 			retval = -EADDRNOTAVAIL;
713 			goto err_bindx_rem;
714 		}
715 
716 		if (sa_addr->v4.sin_port &&
717 		    sa_addr->v4.sin_port != htons(bp->port)) {
718 			retval = -EINVAL;
719 			goto err_bindx_rem;
720 		}
721 
722 		if (!sa_addr->v4.sin_port)
723 			sa_addr->v4.sin_port = htons(bp->port);
724 
725 		/* FIXME - There is probably a need to check if sk->sk_saddr and
726 		 * sk->sk_rcv_addr are currently set to one of the addresses to
727 		 * be removed. This is something which needs to be looked into
728 		 * when we are fixing the outstanding issues with multi-homing
729 		 * socket routing and failover schemes. Refer to comments in
730 		 * sctp_do_bind(). -daisy
731 		 */
732 		retval = sctp_del_bind_addr(bp, sa_addr);
733 
734 		addr_buf += af->sockaddr_len;
735 err_bindx_rem:
736 		if (retval < 0) {
737 			/* Failed. Add the ones that has been removed back */
738 			if (cnt > 0)
739 				sctp_bindx_add(sk, addrs, cnt);
740 			return retval;
741 		}
742 	}
743 
744 	return retval;
745 }
746 
747 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
748  * the associations that are part of the endpoint indicating that a list of
749  * local addresses are removed from the endpoint.
750  *
751  * If any of the addresses is already in the bind address list of the
752  * association, we do not send the chunk for that association.  But it will not
753  * affect other associations.
754  *
755  * Only sctp_setsockopt_bindx() is supposed to call this function.
756  */
757 static int sctp_send_asconf_del_ip(struct sock		*sk,
758 				   struct sockaddr	*addrs,
759 				   int			addrcnt)
760 {
761 	struct sctp_sock	*sp;
762 	struct sctp_endpoint	*ep;
763 	struct sctp_association	*asoc;
764 	struct sctp_transport	*transport;
765 	struct sctp_bind_addr	*bp;
766 	struct sctp_chunk	*chunk;
767 	union sctp_addr		*laddr;
768 	void			*addr_buf;
769 	struct sctp_af		*af;
770 	struct sctp_sockaddr_entry *saddr;
771 	int 			i;
772 	int 			retval = 0;
773 	int			stored = 0;
774 
775 	chunk = NULL;
776 	sp = sctp_sk(sk);
777 	ep = sp->ep;
778 
779 	if (!ep->asconf_enable)
780 		return retval;
781 
782 	pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
783 		 __func__, sk, addrs, addrcnt);
784 
785 	list_for_each_entry(asoc, &ep->asocs, asocs) {
786 
787 		if (!asoc->peer.asconf_capable)
788 			continue;
789 
790 		if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP)
791 			continue;
792 
793 		if (!sctp_state(asoc, ESTABLISHED))
794 			continue;
795 
796 		/* Check if any address in the packed array of addresses is
797 		 * not present in the bind address list of the association.
798 		 * If so, do not send the asconf chunk to its peer, but
799 		 * continue with other associations.
800 		 */
801 		addr_buf = addrs;
802 		for (i = 0; i < addrcnt; i++) {
803 			laddr = addr_buf;
804 			af = sctp_get_af_specific(laddr->v4.sin_family);
805 			if (!af) {
806 				retval = -EINVAL;
807 				goto out;
808 			}
809 
810 			if (!sctp_assoc_lookup_laddr(asoc, laddr))
811 				break;
812 
813 			addr_buf += af->sockaddr_len;
814 		}
815 		if (i < addrcnt)
816 			continue;
817 
818 		/* Find one address in the association's bind address list
819 		 * that is not in the packed array of addresses. This is to
820 		 * make sure that we do not delete all the addresses in the
821 		 * association.
822 		 */
823 		bp = &asoc->base.bind_addr;
824 		laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs,
825 					       addrcnt, sp);
826 		if ((laddr == NULL) && (addrcnt == 1)) {
827 			if (asoc->asconf_addr_del_pending)
828 				continue;
829 			asoc->asconf_addr_del_pending =
830 			    kzalloc(sizeof(union sctp_addr), GFP_ATOMIC);
831 			if (asoc->asconf_addr_del_pending == NULL) {
832 				retval = -ENOMEM;
833 				goto out;
834 			}
835 			asoc->asconf_addr_del_pending->sa.sa_family =
836 				    addrs->sa_family;
837 			asoc->asconf_addr_del_pending->v4.sin_port =
838 				    htons(bp->port);
839 			if (addrs->sa_family == AF_INET) {
840 				struct sockaddr_in *sin;
841 
842 				sin = (struct sockaddr_in *)addrs;
843 				asoc->asconf_addr_del_pending->v4.sin_addr.s_addr = sin->sin_addr.s_addr;
844 			} else if (addrs->sa_family == AF_INET6) {
845 				struct sockaddr_in6 *sin6;
846 
847 				sin6 = (struct sockaddr_in6 *)addrs;
848 				asoc->asconf_addr_del_pending->v6.sin6_addr = sin6->sin6_addr;
849 			}
850 
851 			pr_debug("%s: keep the last address asoc:%p %pISc at %p\n",
852 				 __func__, asoc, &asoc->asconf_addr_del_pending->sa,
853 				 asoc->asconf_addr_del_pending);
854 
855 			asoc->src_out_of_asoc_ok = 1;
856 			stored = 1;
857 			goto skip_mkasconf;
858 		}
859 
860 		if (laddr == NULL)
861 			return -EINVAL;
862 
863 		/* We do not need RCU protection throughout this loop
864 		 * because this is done under a socket lock from the
865 		 * setsockopt call.
866 		 */
867 		chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
868 						   SCTP_PARAM_DEL_IP);
869 		if (!chunk) {
870 			retval = -ENOMEM;
871 			goto out;
872 		}
873 
874 skip_mkasconf:
875 		/* Reset use_as_src flag for the addresses in the bind address
876 		 * list that are to be deleted.
877 		 */
878 		addr_buf = addrs;
879 		for (i = 0; i < addrcnt; i++) {
880 			laddr = addr_buf;
881 			af = sctp_get_af_specific(laddr->v4.sin_family);
882 			list_for_each_entry(saddr, &bp->address_list, list) {
883 				if (sctp_cmp_addr_exact(&saddr->a, laddr))
884 					saddr->state = SCTP_ADDR_DEL;
885 			}
886 			addr_buf += af->sockaddr_len;
887 		}
888 
889 		/* Update the route and saddr entries for all the transports
890 		 * as some of the addresses in the bind address list are
891 		 * about to be deleted and cannot be used as source addresses.
892 		 */
893 		list_for_each_entry(transport, &asoc->peer.transport_addr_list,
894 					transports) {
895 			sctp_transport_route(transport, NULL,
896 					     sctp_sk(asoc->base.sk));
897 		}
898 
899 		if (stored)
900 			/* We don't need to transmit ASCONF */
901 			continue;
902 		retval = sctp_send_asconf(asoc, chunk);
903 	}
904 out:
905 	return retval;
906 }
907 
908 /* set addr events to assocs in the endpoint.  ep and addr_wq must be locked */
909 int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw)
910 {
911 	struct sock *sk = sctp_opt2sk(sp);
912 	union sctp_addr *addr;
913 	struct sctp_af *af;
914 
915 	/* It is safe to write port space in caller. */
916 	addr = &addrw->a;
917 	addr->v4.sin_port = htons(sp->ep->base.bind_addr.port);
918 	af = sctp_get_af_specific(addr->sa.sa_family);
919 	if (!af)
920 		return -EINVAL;
921 	if (sctp_verify_addr(sk, addr, af->sockaddr_len))
922 		return -EINVAL;
923 
924 	if (addrw->state == SCTP_ADDR_NEW)
925 		return sctp_send_asconf_add_ip(sk, (struct sockaddr *)addr, 1);
926 	else
927 		return sctp_send_asconf_del_ip(sk, (struct sockaddr *)addr, 1);
928 }
929 
930 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
931  *
932  * API 8.1
933  * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
934  *                int flags);
935  *
936  * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
937  * If the sd is an IPv6 socket, the addresses passed can either be IPv4
938  * or IPv6 addresses.
939  *
940  * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
941  * Section 3.1.2 for this usage.
942  *
943  * addrs is a pointer to an array of one or more socket addresses. Each
944  * address is contained in its appropriate structure (i.e. struct
945  * sockaddr_in or struct sockaddr_in6) the family of the address type
946  * must be used to distinguish the address length (note that this
947  * representation is termed a "packed array" of addresses). The caller
948  * specifies the number of addresses in the array with addrcnt.
949  *
950  * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
951  * -1, and sets errno to the appropriate error code.
952  *
953  * For SCTP, the port given in each socket address must be the same, or
954  * sctp_bindx() will fail, setting errno to EINVAL.
955  *
956  * The flags parameter is formed from the bitwise OR of zero or more of
957  * the following currently defined flags:
958  *
959  * SCTP_BINDX_ADD_ADDR
960  *
961  * SCTP_BINDX_REM_ADDR
962  *
963  * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
964  * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
965  * addresses from the association. The two flags are mutually exclusive;
966  * if both are given, sctp_bindx() will fail with EINVAL. A caller may
967  * not remove all addresses from an association; sctp_bindx() will
968  * reject such an attempt with EINVAL.
969  *
970  * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
971  * additional addresses with an endpoint after calling bind().  Or use
972  * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
973  * socket is associated with so that no new association accepted will be
974  * associated with those addresses. If the endpoint supports dynamic
975  * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
976  * endpoint to send the appropriate message to the peer to change the
977  * peers address lists.
978  *
979  * Adding and removing addresses from a connected association is
980  * optional functionality. Implementations that do not support this
981  * functionality should return EOPNOTSUPP.
982  *
983  * Basically do nothing but copying the addresses from user to kernel
984  * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
985  * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
986  * from userspace.
987  *
988  * On exit there is no need to do sockfd_put(), sys_setsockopt() does
989  * it.
990  *
991  * sk        The sk of the socket
992  * addrs     The pointer to the addresses
993  * addrssize Size of the addrs buffer
994  * op        Operation to perform (add or remove, see the flags of
995  *           sctp_bindx)
996  *
997  * Returns 0 if ok, <0 errno code on error.
998  */
999 static int sctp_setsockopt_bindx(struct sock *sk, struct sockaddr *addrs,
1000 				 int addrs_size, int op)
1001 {
1002 	int err;
1003 	int addrcnt = 0;
1004 	int walk_size = 0;
1005 	struct sockaddr *sa_addr;
1006 	void *addr_buf = addrs;
1007 	struct sctp_af *af;
1008 
1009 	pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n",
1010 		 __func__, sk, addr_buf, addrs_size, op);
1011 
1012 	if (unlikely(addrs_size <= 0))
1013 		return -EINVAL;
1014 
1015 	/* Walk through the addrs buffer and count the number of addresses. */
1016 	while (walk_size < addrs_size) {
1017 		if (walk_size + sizeof(sa_family_t) > addrs_size)
1018 			return -EINVAL;
1019 
1020 		sa_addr = addr_buf;
1021 		af = sctp_get_af_specific(sa_addr->sa_family);
1022 
1023 		/* If the address family is not supported or if this address
1024 		 * causes the address buffer to overflow return EINVAL.
1025 		 */
1026 		if (!af || (walk_size + af->sockaddr_len) > addrs_size)
1027 			return -EINVAL;
1028 		addrcnt++;
1029 		addr_buf += af->sockaddr_len;
1030 		walk_size += af->sockaddr_len;
1031 	}
1032 
1033 	/* Do the work. */
1034 	switch (op) {
1035 	case SCTP_BINDX_ADD_ADDR:
1036 		/* Allow security module to validate bindx addresses. */
1037 		err = security_sctp_bind_connect(sk, SCTP_SOCKOPT_BINDX_ADD,
1038 						 addrs, addrs_size);
1039 		if (err)
1040 			return err;
1041 		err = sctp_bindx_add(sk, addrs, addrcnt);
1042 		if (err)
1043 			return err;
1044 		return sctp_send_asconf_add_ip(sk, addrs, addrcnt);
1045 	case SCTP_BINDX_REM_ADDR:
1046 		err = sctp_bindx_rem(sk, addrs, addrcnt);
1047 		if (err)
1048 			return err;
1049 		return sctp_send_asconf_del_ip(sk, addrs, addrcnt);
1050 
1051 	default:
1052 		return -EINVAL;
1053 	}
1054 }
1055 
1056 static int sctp_bind_add(struct sock *sk, struct sockaddr *addrs,
1057 		int addrlen)
1058 {
1059 	int err;
1060 
1061 	lock_sock(sk);
1062 	err = sctp_setsockopt_bindx(sk, addrs, addrlen, SCTP_BINDX_ADD_ADDR);
1063 	release_sock(sk);
1064 	return err;
1065 }
1066 
1067 static int sctp_connect_new_asoc(struct sctp_endpoint *ep,
1068 				 const union sctp_addr *daddr,
1069 				 const struct sctp_initmsg *init,
1070 				 struct sctp_transport **tp)
1071 {
1072 	struct sctp_association *asoc;
1073 	struct sock *sk = ep->base.sk;
1074 	struct net *net = sock_net(sk);
1075 	enum sctp_scope scope;
1076 	int err;
1077 
1078 	if (sctp_endpoint_is_peeled_off(ep, daddr))
1079 		return -EADDRNOTAVAIL;
1080 
1081 	if (!ep->base.bind_addr.port) {
1082 		if (sctp_autobind(sk))
1083 			return -EAGAIN;
1084 	} else {
1085 		if (inet_port_requires_bind_service(net, ep->base.bind_addr.port) &&
1086 		    !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
1087 			return -EACCES;
1088 	}
1089 
1090 	scope = sctp_scope(daddr);
1091 	asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1092 	if (!asoc)
1093 		return -ENOMEM;
1094 
1095 	err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL);
1096 	if (err < 0)
1097 		goto free;
1098 
1099 	*tp = sctp_assoc_add_peer(asoc, daddr, GFP_KERNEL, SCTP_UNKNOWN);
1100 	if (!*tp) {
1101 		err = -ENOMEM;
1102 		goto free;
1103 	}
1104 
1105 	if (!init)
1106 		return 0;
1107 
1108 	if (init->sinit_num_ostreams) {
1109 		__u16 outcnt = init->sinit_num_ostreams;
1110 
1111 		asoc->c.sinit_num_ostreams = outcnt;
1112 		/* outcnt has been changed, need to re-init stream */
1113 		err = sctp_stream_init(&asoc->stream, outcnt, 0, GFP_KERNEL);
1114 		if (err)
1115 			goto free;
1116 	}
1117 
1118 	if (init->sinit_max_instreams)
1119 		asoc->c.sinit_max_instreams = init->sinit_max_instreams;
1120 
1121 	if (init->sinit_max_attempts)
1122 		asoc->max_init_attempts = init->sinit_max_attempts;
1123 
1124 	if (init->sinit_max_init_timeo)
1125 		asoc->max_init_timeo =
1126 			msecs_to_jiffies(init->sinit_max_init_timeo);
1127 
1128 	return 0;
1129 free:
1130 	sctp_association_free(asoc);
1131 	return err;
1132 }
1133 
1134 static int sctp_connect_add_peer(struct sctp_association *asoc,
1135 				 union sctp_addr *daddr, int addr_len)
1136 {
1137 	struct sctp_endpoint *ep = asoc->ep;
1138 	struct sctp_association *old;
1139 	struct sctp_transport *t;
1140 	int err;
1141 
1142 	err = sctp_verify_addr(ep->base.sk, daddr, addr_len);
1143 	if (err)
1144 		return err;
1145 
1146 	old = sctp_endpoint_lookup_assoc(ep, daddr, &t);
1147 	if (old && old != asoc)
1148 		return old->state >= SCTP_STATE_ESTABLISHED ? -EISCONN
1149 							    : -EALREADY;
1150 
1151 	if (sctp_endpoint_is_peeled_off(ep, daddr))
1152 		return -EADDRNOTAVAIL;
1153 
1154 	t = sctp_assoc_add_peer(asoc, daddr, GFP_KERNEL, SCTP_UNKNOWN);
1155 	if (!t)
1156 		return -ENOMEM;
1157 
1158 	return 0;
1159 }
1160 
1161 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1162  *
1163  * Common routine for handling connect() and sctp_connectx().
1164  * Connect will come in with just a single address.
1165  */
1166 static int __sctp_connect(struct sock *sk, struct sockaddr *kaddrs,
1167 			  int addrs_size, int flags, sctp_assoc_t *assoc_id)
1168 {
1169 	struct sctp_sock *sp = sctp_sk(sk);
1170 	struct sctp_endpoint *ep = sp->ep;
1171 	struct sctp_transport *transport;
1172 	struct sctp_association *asoc;
1173 	void *addr_buf = kaddrs;
1174 	union sctp_addr *daddr;
1175 	struct sctp_af *af;
1176 	int walk_size, err;
1177 	long timeo;
1178 
1179 	if (sctp_sstate(sk, ESTABLISHED) || sctp_sstate(sk, CLOSING) ||
1180 	    (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)))
1181 		return -EISCONN;
1182 
1183 	daddr = addr_buf;
1184 	af = sctp_get_af_specific(daddr->sa.sa_family);
1185 	if (!af || af->sockaddr_len > addrs_size)
1186 		return -EINVAL;
1187 
1188 	err = sctp_verify_addr(sk, daddr, af->sockaddr_len);
1189 	if (err)
1190 		return err;
1191 
1192 	asoc = sctp_endpoint_lookup_assoc(ep, daddr, &transport);
1193 	if (asoc)
1194 		return asoc->state >= SCTP_STATE_ESTABLISHED ? -EISCONN
1195 							     : -EALREADY;
1196 
1197 	err = sctp_connect_new_asoc(ep, daddr, NULL, &transport);
1198 	if (err)
1199 		return err;
1200 	asoc = transport->asoc;
1201 
1202 	addr_buf += af->sockaddr_len;
1203 	walk_size = af->sockaddr_len;
1204 	while (walk_size < addrs_size) {
1205 		err = -EINVAL;
1206 		if (walk_size + sizeof(sa_family_t) > addrs_size)
1207 			goto out_free;
1208 
1209 		daddr = addr_buf;
1210 		af = sctp_get_af_specific(daddr->sa.sa_family);
1211 		if (!af || af->sockaddr_len + walk_size > addrs_size)
1212 			goto out_free;
1213 
1214 		if (asoc->peer.port != ntohs(daddr->v4.sin_port))
1215 			goto out_free;
1216 
1217 		err = sctp_connect_add_peer(asoc, daddr, af->sockaddr_len);
1218 		if (err)
1219 			goto out_free;
1220 
1221 		addr_buf  += af->sockaddr_len;
1222 		walk_size += af->sockaddr_len;
1223 	}
1224 
1225 	/* In case the user of sctp_connectx() wants an association
1226 	 * id back, assign one now.
1227 	 */
1228 	if (assoc_id) {
1229 		err = sctp_assoc_set_id(asoc, GFP_KERNEL);
1230 		if (err < 0)
1231 			goto out_free;
1232 	}
1233 
1234 	err = sctp_primitive_ASSOCIATE(sock_net(sk), asoc, NULL);
1235 	if (err < 0)
1236 		goto out_free;
1237 
1238 	/* Initialize sk's dport and daddr for getpeername() */
1239 	inet_sk(sk)->inet_dport = htons(asoc->peer.port);
1240 	sp->pf->to_sk_daddr(daddr, sk);
1241 	sk->sk_err = 0;
1242 
1243 	if (assoc_id)
1244 		*assoc_id = asoc->assoc_id;
1245 
1246 	timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
1247 	return sctp_wait_for_connect(asoc, &timeo);
1248 
1249 out_free:
1250 	pr_debug("%s: took out_free path with asoc:%p kaddrs:%p err:%d\n",
1251 		 __func__, asoc, kaddrs, err);
1252 	sctp_association_free(asoc);
1253 	return err;
1254 }
1255 
1256 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1257  *
1258  * API 8.9
1259  * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1260  * 			sctp_assoc_t *asoc);
1261  *
1262  * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1263  * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1264  * or IPv6 addresses.
1265  *
1266  * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1267  * Section 3.1.2 for this usage.
1268  *
1269  * addrs is a pointer to an array of one or more socket addresses. Each
1270  * address is contained in its appropriate structure (i.e. struct
1271  * sockaddr_in or struct sockaddr_in6) the family of the address type
1272  * must be used to distengish the address length (note that this
1273  * representation is termed a "packed array" of addresses). The caller
1274  * specifies the number of addresses in the array with addrcnt.
1275  *
1276  * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1277  * the association id of the new association.  On failure, sctp_connectx()
1278  * returns -1, and sets errno to the appropriate error code.  The assoc_id
1279  * is not touched by the kernel.
1280  *
1281  * For SCTP, the port given in each socket address must be the same, or
1282  * sctp_connectx() will fail, setting errno to EINVAL.
1283  *
1284  * An application can use sctp_connectx to initiate an association with
1285  * an endpoint that is multi-homed.  Much like sctp_bindx() this call
1286  * allows a caller to specify multiple addresses at which a peer can be
1287  * reached.  The way the SCTP stack uses the list of addresses to set up
1288  * the association is implementation dependent.  This function only
1289  * specifies that the stack will try to make use of all the addresses in
1290  * the list when needed.
1291  *
1292  * Note that the list of addresses passed in is only used for setting up
1293  * the association.  It does not necessarily equal the set of addresses
1294  * the peer uses for the resulting association.  If the caller wants to
1295  * find out the set of peer addresses, it must use sctp_getpaddrs() to
1296  * retrieve them after the association has been set up.
1297  *
1298  * Basically do nothing but copying the addresses from user to kernel
1299  * land and invoking either sctp_connectx(). This is used for tunneling
1300  * the sctp_connectx() request through sctp_setsockopt() from userspace.
1301  *
1302  * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1303  * it.
1304  *
1305  * sk        The sk of the socket
1306  * addrs     The pointer to the addresses
1307  * addrssize Size of the addrs buffer
1308  *
1309  * Returns >=0 if ok, <0 errno code on error.
1310  */
1311 static int __sctp_setsockopt_connectx(struct sock *sk, struct sockaddr *kaddrs,
1312 				      int addrs_size, sctp_assoc_t *assoc_id)
1313 {
1314 	int err = 0, flags = 0;
1315 
1316 	pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n",
1317 		 __func__, sk, kaddrs, addrs_size);
1318 
1319 	/* make sure the 1st addr's sa_family is accessible later */
1320 	if (unlikely(addrs_size < sizeof(sa_family_t)))
1321 		return -EINVAL;
1322 
1323 	/* Allow security module to validate connectx addresses. */
1324 	err = security_sctp_bind_connect(sk, SCTP_SOCKOPT_CONNECTX,
1325 					 (struct sockaddr *)kaddrs,
1326 					  addrs_size);
1327 	if (err)
1328 		return err;
1329 
1330 	/* in-kernel sockets don't generally have a file allocated to them
1331 	 * if all they do is call sock_create_kern().
1332 	 */
1333 	if (sk->sk_socket->file)
1334 		flags = sk->sk_socket->file->f_flags;
1335 
1336 	return __sctp_connect(sk, kaddrs, addrs_size, flags, assoc_id);
1337 }
1338 
1339 /*
1340  * This is an older interface.  It's kept for backward compatibility
1341  * to the option that doesn't provide association id.
1342  */
1343 static int sctp_setsockopt_connectx_old(struct sock *sk,
1344 					struct sockaddr *kaddrs,
1345 					int addrs_size)
1346 {
1347 	return __sctp_setsockopt_connectx(sk, kaddrs, addrs_size, NULL);
1348 }
1349 
1350 /*
1351  * New interface for the API.  The since the API is done with a socket
1352  * option, to make it simple we feed back the association id is as a return
1353  * indication to the call.  Error is always negative and association id is
1354  * always positive.
1355  */
1356 static int sctp_setsockopt_connectx(struct sock *sk,
1357 				    struct sockaddr *kaddrs,
1358 				    int addrs_size)
1359 {
1360 	sctp_assoc_t assoc_id = 0;
1361 	int err = 0;
1362 
1363 	err = __sctp_setsockopt_connectx(sk, kaddrs, addrs_size, &assoc_id);
1364 
1365 	if (err)
1366 		return err;
1367 	else
1368 		return assoc_id;
1369 }
1370 
1371 /*
1372  * New (hopefully final) interface for the API.
1373  * We use the sctp_getaddrs_old structure so that use-space library
1374  * can avoid any unnecessary allocations. The only different part
1375  * is that we store the actual length of the address buffer into the
1376  * addrs_num structure member. That way we can re-use the existing
1377  * code.
1378  */
1379 #ifdef CONFIG_COMPAT
1380 struct compat_sctp_getaddrs_old {
1381 	sctp_assoc_t	assoc_id;
1382 	s32		addr_num;
1383 	compat_uptr_t	addrs;		/* struct sockaddr * */
1384 };
1385 #endif
1386 
1387 static int sctp_getsockopt_connectx3(struct sock *sk, int len,
1388 				     char __user *optval,
1389 				     int __user *optlen)
1390 {
1391 	struct sctp_getaddrs_old param;
1392 	sctp_assoc_t assoc_id = 0;
1393 	struct sockaddr *kaddrs;
1394 	int err = 0;
1395 
1396 #ifdef CONFIG_COMPAT
1397 	if (in_compat_syscall()) {
1398 		struct compat_sctp_getaddrs_old param32;
1399 
1400 		if (len < sizeof(param32))
1401 			return -EINVAL;
1402 		if (copy_from_user(&param32, optval, sizeof(param32)))
1403 			return -EFAULT;
1404 
1405 		param.assoc_id = param32.assoc_id;
1406 		param.addr_num = param32.addr_num;
1407 		param.addrs = compat_ptr(param32.addrs);
1408 	} else
1409 #endif
1410 	{
1411 		if (len < sizeof(param))
1412 			return -EINVAL;
1413 		if (copy_from_user(&param, optval, sizeof(param)))
1414 			return -EFAULT;
1415 	}
1416 
1417 	kaddrs = memdup_user(param.addrs, param.addr_num);
1418 	if (IS_ERR(kaddrs))
1419 		return PTR_ERR(kaddrs);
1420 
1421 	err = __sctp_setsockopt_connectx(sk, kaddrs, param.addr_num, &assoc_id);
1422 	kfree(kaddrs);
1423 	if (err == 0 || err == -EINPROGRESS) {
1424 		if (copy_to_user(optval, &assoc_id, sizeof(assoc_id)))
1425 			return -EFAULT;
1426 		if (put_user(sizeof(assoc_id), optlen))
1427 			return -EFAULT;
1428 	}
1429 
1430 	return err;
1431 }
1432 
1433 /* API 3.1.4 close() - UDP Style Syntax
1434  * Applications use close() to perform graceful shutdown (as described in
1435  * Section 10.1 of [SCTP]) on ALL the associations currently represented
1436  * by a UDP-style socket.
1437  *
1438  * The syntax is
1439  *
1440  *   ret = close(int sd);
1441  *
1442  *   sd      - the socket descriptor of the associations to be closed.
1443  *
1444  * To gracefully shutdown a specific association represented by the
1445  * UDP-style socket, an application should use the sendmsg() call,
1446  * passing no user data, but including the appropriate flag in the
1447  * ancillary data (see Section xxxx).
1448  *
1449  * If sd in the close() call is a branched-off socket representing only
1450  * one association, the shutdown is performed on that association only.
1451  *
1452  * 4.1.6 close() - TCP Style Syntax
1453  *
1454  * Applications use close() to gracefully close down an association.
1455  *
1456  * The syntax is:
1457  *
1458  *    int close(int sd);
1459  *
1460  *      sd      - the socket descriptor of the association to be closed.
1461  *
1462  * After an application calls close() on a socket descriptor, no further
1463  * socket operations will succeed on that descriptor.
1464  *
1465  * API 7.1.4 SO_LINGER
1466  *
1467  * An application using the TCP-style socket can use this option to
1468  * perform the SCTP ABORT primitive.  The linger option structure is:
1469  *
1470  *  struct  linger {
1471  *     int     l_onoff;                // option on/off
1472  *     int     l_linger;               // linger time
1473  * };
1474  *
1475  * To enable the option, set l_onoff to 1.  If the l_linger value is set
1476  * to 0, calling close() is the same as the ABORT primitive.  If the
1477  * value is set to a negative value, the setsockopt() call will return
1478  * an error.  If the value is set to a positive value linger_time, the
1479  * close() can be blocked for at most linger_time ms.  If the graceful
1480  * shutdown phase does not finish during this period, close() will
1481  * return but the graceful shutdown phase continues in the system.
1482  */
1483 static void sctp_close(struct sock *sk, long timeout)
1484 {
1485 	struct net *net = sock_net(sk);
1486 	struct sctp_endpoint *ep;
1487 	struct sctp_association *asoc;
1488 	struct list_head *pos, *temp;
1489 	unsigned int data_was_unread;
1490 
1491 	pr_debug("%s: sk:%p, timeout:%ld\n", __func__, sk, timeout);
1492 
1493 	lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
1494 	sk->sk_shutdown = SHUTDOWN_MASK;
1495 	inet_sk_set_state(sk, SCTP_SS_CLOSING);
1496 
1497 	ep = sctp_sk(sk)->ep;
1498 
1499 	/* Clean up any skbs sitting on the receive queue.  */
1500 	data_was_unread = sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
1501 	data_was_unread += sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);
1502 
1503 	/* Walk all associations on an endpoint.  */
1504 	list_for_each_safe(pos, temp, &ep->asocs) {
1505 		asoc = list_entry(pos, struct sctp_association, asocs);
1506 
1507 		if (sctp_style(sk, TCP)) {
1508 			/* A closed association can still be in the list if
1509 			 * it belongs to a TCP-style listening socket that is
1510 			 * not yet accepted. If so, free it. If not, send an
1511 			 * ABORT or SHUTDOWN based on the linger options.
1512 			 */
1513 			if (sctp_state(asoc, CLOSED)) {
1514 				sctp_association_free(asoc);
1515 				continue;
1516 			}
1517 		}
1518 
1519 		if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) ||
1520 		    !skb_queue_empty(&asoc->ulpq.reasm) ||
1521 		    !skb_queue_empty(&asoc->ulpq.reasm_uo) ||
1522 		    (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) {
1523 			struct sctp_chunk *chunk;
1524 
1525 			chunk = sctp_make_abort_user(asoc, NULL, 0);
1526 			sctp_primitive_ABORT(net, asoc, chunk);
1527 		} else
1528 			sctp_primitive_SHUTDOWN(net, asoc, NULL);
1529 	}
1530 
1531 	/* On a TCP-style socket, block for at most linger_time if set. */
1532 	if (sctp_style(sk, TCP) && timeout)
1533 		sctp_wait_for_close(sk, timeout);
1534 
1535 	/* This will run the backlog queue.  */
1536 	release_sock(sk);
1537 
1538 	/* Supposedly, no process has access to the socket, but
1539 	 * the net layers still may.
1540 	 * Also, sctp_destroy_sock() needs to be called with addr_wq_lock
1541 	 * held and that should be grabbed before socket lock.
1542 	 */
1543 	spin_lock_bh(&net->sctp.addr_wq_lock);
1544 	bh_lock_sock_nested(sk);
1545 
1546 	/* Hold the sock, since sk_common_release() will put sock_put()
1547 	 * and we have just a little more cleanup.
1548 	 */
1549 	sock_hold(sk);
1550 	sk_common_release(sk);
1551 
1552 	bh_unlock_sock(sk);
1553 	spin_unlock_bh(&net->sctp.addr_wq_lock);
1554 
1555 	sock_put(sk);
1556 
1557 	SCTP_DBG_OBJCNT_DEC(sock);
1558 }
1559 
1560 /* Handle EPIPE error. */
1561 static int sctp_error(struct sock *sk, int flags, int err)
1562 {
1563 	if (err == -EPIPE)
1564 		err = sock_error(sk) ? : -EPIPE;
1565 	if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1566 		send_sig(SIGPIPE, current, 0);
1567 	return err;
1568 }
1569 
1570 /* API 3.1.3 sendmsg() - UDP Style Syntax
1571  *
1572  * An application uses sendmsg() and recvmsg() calls to transmit data to
1573  * and receive data from its peer.
1574  *
1575  *  ssize_t sendmsg(int socket, const struct msghdr *message,
1576  *                  int flags);
1577  *
1578  *  socket  - the socket descriptor of the endpoint.
1579  *  message - pointer to the msghdr structure which contains a single
1580  *            user message and possibly some ancillary data.
1581  *
1582  *            See Section 5 for complete description of the data
1583  *            structures.
1584  *
1585  *  flags   - flags sent or received with the user message, see Section
1586  *            5 for complete description of the flags.
1587  *
1588  * Note:  This function could use a rewrite especially when explicit
1589  * connect support comes in.
1590  */
1591 /* BUG:  We do not implement the equivalent of sk_stream_wait_memory(). */
1592 
1593 static int sctp_msghdr_parse(const struct msghdr *msg,
1594 			     struct sctp_cmsgs *cmsgs);
1595 
1596 static int sctp_sendmsg_parse(struct sock *sk, struct sctp_cmsgs *cmsgs,
1597 			      struct sctp_sndrcvinfo *srinfo,
1598 			      const struct msghdr *msg, size_t msg_len)
1599 {
1600 	__u16 sflags;
1601 	int err;
1602 
1603 	if (sctp_sstate(sk, LISTENING) && sctp_style(sk, TCP))
1604 		return -EPIPE;
1605 
1606 	if (msg_len > sk->sk_sndbuf)
1607 		return -EMSGSIZE;
1608 
1609 	memset(cmsgs, 0, sizeof(*cmsgs));
1610 	err = sctp_msghdr_parse(msg, cmsgs);
1611 	if (err) {
1612 		pr_debug("%s: msghdr parse err:%x\n", __func__, err);
1613 		return err;
1614 	}
1615 
1616 	memset(srinfo, 0, sizeof(*srinfo));
1617 	if (cmsgs->srinfo) {
1618 		srinfo->sinfo_stream = cmsgs->srinfo->sinfo_stream;
1619 		srinfo->sinfo_flags = cmsgs->srinfo->sinfo_flags;
1620 		srinfo->sinfo_ppid = cmsgs->srinfo->sinfo_ppid;
1621 		srinfo->sinfo_context = cmsgs->srinfo->sinfo_context;
1622 		srinfo->sinfo_assoc_id = cmsgs->srinfo->sinfo_assoc_id;
1623 		srinfo->sinfo_timetolive = cmsgs->srinfo->sinfo_timetolive;
1624 	}
1625 
1626 	if (cmsgs->sinfo) {
1627 		srinfo->sinfo_stream = cmsgs->sinfo->snd_sid;
1628 		srinfo->sinfo_flags = cmsgs->sinfo->snd_flags;
1629 		srinfo->sinfo_ppid = cmsgs->sinfo->snd_ppid;
1630 		srinfo->sinfo_context = cmsgs->sinfo->snd_context;
1631 		srinfo->sinfo_assoc_id = cmsgs->sinfo->snd_assoc_id;
1632 	}
1633 
1634 	if (cmsgs->prinfo) {
1635 		srinfo->sinfo_timetolive = cmsgs->prinfo->pr_value;
1636 		SCTP_PR_SET_POLICY(srinfo->sinfo_flags,
1637 				   cmsgs->prinfo->pr_policy);
1638 	}
1639 
1640 	sflags = srinfo->sinfo_flags;
1641 	if (!sflags && msg_len)
1642 		return 0;
1643 
1644 	if (sctp_style(sk, TCP) && (sflags & (SCTP_EOF | SCTP_ABORT)))
1645 		return -EINVAL;
1646 
1647 	if (((sflags & SCTP_EOF) && msg_len > 0) ||
1648 	    (!(sflags & (SCTP_EOF | SCTP_ABORT)) && msg_len == 0))
1649 		return -EINVAL;
1650 
1651 	if ((sflags & SCTP_ADDR_OVER) && !msg->msg_name)
1652 		return -EINVAL;
1653 
1654 	return 0;
1655 }
1656 
1657 static int sctp_sendmsg_new_asoc(struct sock *sk, __u16 sflags,
1658 				 struct sctp_cmsgs *cmsgs,
1659 				 union sctp_addr *daddr,
1660 				 struct sctp_transport **tp)
1661 {
1662 	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
1663 	struct sctp_association *asoc;
1664 	struct cmsghdr *cmsg;
1665 	__be32 flowinfo = 0;
1666 	struct sctp_af *af;
1667 	int err;
1668 
1669 	*tp = NULL;
1670 
1671 	if (sflags & (SCTP_EOF | SCTP_ABORT))
1672 		return -EINVAL;
1673 
1674 	if (sctp_style(sk, TCP) && (sctp_sstate(sk, ESTABLISHED) ||
1675 				    sctp_sstate(sk, CLOSING)))
1676 		return -EADDRNOTAVAIL;
1677 
1678 	/* Label connection socket for first association 1-to-many
1679 	 * style for client sequence socket()->sendmsg(). This
1680 	 * needs to be done before sctp_assoc_add_peer() as that will
1681 	 * set up the initial packet that needs to account for any
1682 	 * security ip options (CIPSO/CALIPSO) added to the packet.
1683 	 */
1684 	af = sctp_get_af_specific(daddr->sa.sa_family);
1685 	if (!af)
1686 		return -EINVAL;
1687 	err = security_sctp_bind_connect(sk, SCTP_SENDMSG_CONNECT,
1688 					 (struct sockaddr *)daddr,
1689 					 af->sockaddr_len);
1690 	if (err < 0)
1691 		return err;
1692 
1693 	err = sctp_connect_new_asoc(ep, daddr, cmsgs->init, tp);
1694 	if (err)
1695 		return err;
1696 	asoc = (*tp)->asoc;
1697 
1698 	if (!cmsgs->addrs_msg)
1699 		return 0;
1700 
1701 	if (daddr->sa.sa_family == AF_INET6)
1702 		flowinfo = daddr->v6.sin6_flowinfo;
1703 
1704 	/* sendv addr list parse */
1705 	for_each_cmsghdr(cmsg, cmsgs->addrs_msg) {
1706 		union sctp_addr _daddr;
1707 		int dlen;
1708 
1709 		if (cmsg->cmsg_level != IPPROTO_SCTP ||
1710 		    (cmsg->cmsg_type != SCTP_DSTADDRV4 &&
1711 		     cmsg->cmsg_type != SCTP_DSTADDRV6))
1712 			continue;
1713 
1714 		daddr = &_daddr;
1715 		memset(daddr, 0, sizeof(*daddr));
1716 		dlen = cmsg->cmsg_len - sizeof(struct cmsghdr);
1717 		if (cmsg->cmsg_type == SCTP_DSTADDRV4) {
1718 			if (dlen < sizeof(struct in_addr)) {
1719 				err = -EINVAL;
1720 				goto free;
1721 			}
1722 
1723 			dlen = sizeof(struct in_addr);
1724 			daddr->v4.sin_family = AF_INET;
1725 			daddr->v4.sin_port = htons(asoc->peer.port);
1726 			memcpy(&daddr->v4.sin_addr, CMSG_DATA(cmsg), dlen);
1727 		} else {
1728 			if (dlen < sizeof(struct in6_addr)) {
1729 				err = -EINVAL;
1730 				goto free;
1731 			}
1732 
1733 			dlen = sizeof(struct in6_addr);
1734 			daddr->v6.sin6_flowinfo = flowinfo;
1735 			daddr->v6.sin6_family = AF_INET6;
1736 			daddr->v6.sin6_port = htons(asoc->peer.port);
1737 			memcpy(&daddr->v6.sin6_addr, CMSG_DATA(cmsg), dlen);
1738 		}
1739 
1740 		err = sctp_connect_add_peer(asoc, daddr, sizeof(*daddr));
1741 		if (err)
1742 			goto free;
1743 	}
1744 
1745 	return 0;
1746 
1747 free:
1748 	sctp_association_free(asoc);
1749 	return err;
1750 }
1751 
1752 static int sctp_sendmsg_check_sflags(struct sctp_association *asoc,
1753 				     __u16 sflags, struct msghdr *msg,
1754 				     size_t msg_len)
1755 {
1756 	struct sock *sk = asoc->base.sk;
1757 	struct net *net = sock_net(sk);
1758 
1759 	if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP))
1760 		return -EPIPE;
1761 
1762 	if ((sflags & SCTP_SENDALL) && sctp_style(sk, UDP) &&
1763 	    !sctp_state(asoc, ESTABLISHED))
1764 		return 0;
1765 
1766 	if (sflags & SCTP_EOF) {
1767 		pr_debug("%s: shutting down association:%p\n", __func__, asoc);
1768 		sctp_primitive_SHUTDOWN(net, asoc, NULL);
1769 
1770 		return 0;
1771 	}
1772 
1773 	if (sflags & SCTP_ABORT) {
1774 		struct sctp_chunk *chunk;
1775 
1776 		chunk = sctp_make_abort_user(asoc, msg, msg_len);
1777 		if (!chunk)
1778 			return -ENOMEM;
1779 
1780 		pr_debug("%s: aborting association:%p\n", __func__, asoc);
1781 		sctp_primitive_ABORT(net, asoc, chunk);
1782 		iov_iter_revert(&msg->msg_iter, msg_len);
1783 
1784 		return 0;
1785 	}
1786 
1787 	return 1;
1788 }
1789 
1790 static int sctp_sendmsg_to_asoc(struct sctp_association *asoc,
1791 				struct msghdr *msg, size_t msg_len,
1792 				struct sctp_transport *transport,
1793 				struct sctp_sndrcvinfo *sinfo)
1794 {
1795 	struct sock *sk = asoc->base.sk;
1796 	struct sctp_sock *sp = sctp_sk(sk);
1797 	struct net *net = sock_net(sk);
1798 	struct sctp_datamsg *datamsg;
1799 	bool wait_connect = false;
1800 	struct sctp_chunk *chunk;
1801 	long timeo;
1802 	int err;
1803 
1804 	if (sinfo->sinfo_stream >= asoc->stream.outcnt) {
1805 		err = -EINVAL;
1806 		goto err;
1807 	}
1808 
1809 	if (unlikely(!SCTP_SO(&asoc->stream, sinfo->sinfo_stream)->ext)) {
1810 		err = sctp_stream_init_ext(&asoc->stream, sinfo->sinfo_stream);
1811 		if (err)
1812 			goto err;
1813 	}
1814 
1815 	if (sp->disable_fragments && msg_len > asoc->frag_point) {
1816 		err = -EMSGSIZE;
1817 		goto err;
1818 	}
1819 
1820 	if (asoc->pmtu_pending) {
1821 		if (sp->param_flags & SPP_PMTUD_ENABLE)
1822 			sctp_assoc_sync_pmtu(asoc);
1823 		asoc->pmtu_pending = 0;
1824 	}
1825 
1826 	if (sctp_wspace(asoc) < (int)msg_len)
1827 		sctp_prsctp_prune(asoc, sinfo, msg_len - sctp_wspace(asoc));
1828 
1829 	if (sctp_wspace(asoc) <= 0 || !sk_wmem_schedule(sk, msg_len)) {
1830 		timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1831 		err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
1832 		if (err)
1833 			goto err;
1834 		if (unlikely(sinfo->sinfo_stream >= asoc->stream.outcnt)) {
1835 			err = -EINVAL;
1836 			goto err;
1837 		}
1838 	}
1839 
1840 	if (sctp_state(asoc, CLOSED)) {
1841 		err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1842 		if (err)
1843 			goto err;
1844 
1845 		if (asoc->ep->intl_enable) {
1846 			timeo = sock_sndtimeo(sk, 0);
1847 			err = sctp_wait_for_connect(asoc, &timeo);
1848 			if (err) {
1849 				err = -ESRCH;
1850 				goto err;
1851 			}
1852 		} else {
1853 			wait_connect = true;
1854 		}
1855 
1856 		pr_debug("%s: we associated primitively\n", __func__);
1857 	}
1858 
1859 	datamsg = sctp_datamsg_from_user(asoc, sinfo, &msg->msg_iter);
1860 	if (IS_ERR(datamsg)) {
1861 		err = PTR_ERR(datamsg);
1862 		goto err;
1863 	}
1864 
1865 	asoc->force_delay = !!(msg->msg_flags & MSG_MORE);
1866 
1867 	list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
1868 		sctp_chunk_hold(chunk);
1869 		sctp_set_owner_w(chunk);
1870 		chunk->transport = transport;
1871 	}
1872 
1873 	err = sctp_primitive_SEND(net, asoc, datamsg);
1874 	if (err) {
1875 		sctp_datamsg_free(datamsg);
1876 		goto err;
1877 	}
1878 
1879 	pr_debug("%s: we sent primitively\n", __func__);
1880 
1881 	sctp_datamsg_put(datamsg);
1882 
1883 	if (unlikely(wait_connect)) {
1884 		timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1885 		sctp_wait_for_connect(asoc, &timeo);
1886 	}
1887 
1888 	err = msg_len;
1889 
1890 err:
1891 	return err;
1892 }
1893 
1894 static union sctp_addr *sctp_sendmsg_get_daddr(struct sock *sk,
1895 					       const struct msghdr *msg,
1896 					       struct sctp_cmsgs *cmsgs)
1897 {
1898 	union sctp_addr *daddr = NULL;
1899 	int err;
1900 
1901 	if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
1902 		int len = msg->msg_namelen;
1903 
1904 		if (len > sizeof(*daddr))
1905 			len = sizeof(*daddr);
1906 
1907 		daddr = (union sctp_addr *)msg->msg_name;
1908 
1909 		err = sctp_verify_addr(sk, daddr, len);
1910 		if (err)
1911 			return ERR_PTR(err);
1912 	}
1913 
1914 	return daddr;
1915 }
1916 
1917 static void sctp_sendmsg_update_sinfo(struct sctp_association *asoc,
1918 				      struct sctp_sndrcvinfo *sinfo,
1919 				      struct sctp_cmsgs *cmsgs)
1920 {
1921 	if (!cmsgs->srinfo && !cmsgs->sinfo) {
1922 		sinfo->sinfo_stream = asoc->default_stream;
1923 		sinfo->sinfo_ppid = asoc->default_ppid;
1924 		sinfo->sinfo_context = asoc->default_context;
1925 		sinfo->sinfo_assoc_id = sctp_assoc2id(asoc);
1926 
1927 		if (!cmsgs->prinfo)
1928 			sinfo->sinfo_flags = asoc->default_flags;
1929 	}
1930 
1931 	if (!cmsgs->srinfo && !cmsgs->prinfo)
1932 		sinfo->sinfo_timetolive = asoc->default_timetolive;
1933 
1934 	if (cmsgs->authinfo) {
1935 		/* Reuse sinfo_tsn to indicate that authinfo was set and
1936 		 * sinfo_ssn to save the keyid on tx path.
1937 		 */
1938 		sinfo->sinfo_tsn = 1;
1939 		sinfo->sinfo_ssn = cmsgs->authinfo->auth_keynumber;
1940 	}
1941 }
1942 
1943 static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
1944 {
1945 	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
1946 	struct sctp_transport *transport = NULL;
1947 	struct sctp_sndrcvinfo _sinfo, *sinfo;
1948 	struct sctp_association *asoc, *tmp;
1949 	struct sctp_cmsgs cmsgs;
1950 	union sctp_addr *daddr;
1951 	bool new = false;
1952 	__u16 sflags;
1953 	int err;
1954 
1955 	/* Parse and get snd_info */
1956 	err = sctp_sendmsg_parse(sk, &cmsgs, &_sinfo, msg, msg_len);
1957 	if (err)
1958 		goto out;
1959 
1960 	sinfo  = &_sinfo;
1961 	sflags = sinfo->sinfo_flags;
1962 
1963 	/* Get daddr from msg */
1964 	daddr = sctp_sendmsg_get_daddr(sk, msg, &cmsgs);
1965 	if (IS_ERR(daddr)) {
1966 		err = PTR_ERR(daddr);
1967 		goto out;
1968 	}
1969 
1970 	lock_sock(sk);
1971 
1972 	/* SCTP_SENDALL process */
1973 	if ((sflags & SCTP_SENDALL) && sctp_style(sk, UDP)) {
1974 		list_for_each_entry_safe(asoc, tmp, &ep->asocs, asocs) {
1975 			err = sctp_sendmsg_check_sflags(asoc, sflags, msg,
1976 							msg_len);
1977 			if (err == 0)
1978 				continue;
1979 			if (err < 0)
1980 				goto out_unlock;
1981 
1982 			sctp_sendmsg_update_sinfo(asoc, sinfo, &cmsgs);
1983 
1984 			err = sctp_sendmsg_to_asoc(asoc, msg, msg_len,
1985 						   NULL, sinfo);
1986 			if (err < 0)
1987 				goto out_unlock;
1988 
1989 			iov_iter_revert(&msg->msg_iter, err);
1990 		}
1991 
1992 		goto out_unlock;
1993 	}
1994 
1995 	/* Get and check or create asoc */
1996 	if (daddr) {
1997 		asoc = sctp_endpoint_lookup_assoc(ep, daddr, &transport);
1998 		if (asoc) {
1999 			err = sctp_sendmsg_check_sflags(asoc, sflags, msg,
2000 							msg_len);
2001 			if (err <= 0)
2002 				goto out_unlock;
2003 		} else {
2004 			err = sctp_sendmsg_new_asoc(sk, sflags, &cmsgs, daddr,
2005 						    &transport);
2006 			if (err)
2007 				goto out_unlock;
2008 
2009 			asoc = transport->asoc;
2010 			new = true;
2011 		}
2012 
2013 		if (!sctp_style(sk, TCP) && !(sflags & SCTP_ADDR_OVER))
2014 			transport = NULL;
2015 	} else {
2016 		asoc = sctp_id2assoc(sk, sinfo->sinfo_assoc_id);
2017 		if (!asoc) {
2018 			err = -EPIPE;
2019 			goto out_unlock;
2020 		}
2021 
2022 		err = sctp_sendmsg_check_sflags(asoc, sflags, msg, msg_len);
2023 		if (err <= 0)
2024 			goto out_unlock;
2025 	}
2026 
2027 	/* Update snd_info with the asoc */
2028 	sctp_sendmsg_update_sinfo(asoc, sinfo, &cmsgs);
2029 
2030 	/* Send msg to the asoc */
2031 	err = sctp_sendmsg_to_asoc(asoc, msg, msg_len, transport, sinfo);
2032 	if (err < 0 && err != -ESRCH && new)
2033 		sctp_association_free(asoc);
2034 
2035 out_unlock:
2036 	release_sock(sk);
2037 out:
2038 	return sctp_error(sk, msg->msg_flags, err);
2039 }
2040 
2041 /* This is an extended version of skb_pull() that removes the data from the
2042  * start of a skb even when data is spread across the list of skb's in the
2043  * frag_list. len specifies the total amount of data that needs to be removed.
2044  * when 'len' bytes could be removed from the skb, it returns 0.
2045  * If 'len' exceeds the total skb length,  it returns the no. of bytes that
2046  * could not be removed.
2047  */
2048 static int sctp_skb_pull(struct sk_buff *skb, int len)
2049 {
2050 	struct sk_buff *list;
2051 	int skb_len = skb_headlen(skb);
2052 	int rlen;
2053 
2054 	if (len <= skb_len) {
2055 		__skb_pull(skb, len);
2056 		return 0;
2057 	}
2058 	len -= skb_len;
2059 	__skb_pull(skb, skb_len);
2060 
2061 	skb_walk_frags(skb, list) {
2062 		rlen = sctp_skb_pull(list, len);
2063 		skb->len -= (len-rlen);
2064 		skb->data_len -= (len-rlen);
2065 
2066 		if (!rlen)
2067 			return 0;
2068 
2069 		len = rlen;
2070 	}
2071 
2072 	return len;
2073 }
2074 
2075 /* API 3.1.3  recvmsg() - UDP Style Syntax
2076  *
2077  *  ssize_t recvmsg(int socket, struct msghdr *message,
2078  *                    int flags);
2079  *
2080  *  socket  - the socket descriptor of the endpoint.
2081  *  message - pointer to the msghdr structure which contains a single
2082  *            user message and possibly some ancillary data.
2083  *
2084  *            See Section 5 for complete description of the data
2085  *            structures.
2086  *
2087  *  flags   - flags sent or received with the user message, see Section
2088  *            5 for complete description of the flags.
2089  */
2090 static int sctp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
2091 			int flags, int *addr_len)
2092 {
2093 	struct sctp_ulpevent *event = NULL;
2094 	struct sctp_sock *sp = sctp_sk(sk);
2095 	struct sk_buff *skb, *head_skb;
2096 	int copied;
2097 	int err = 0;
2098 	int skb_len;
2099 
2100 	pr_debug("%s: sk:%p, msghdr:%p, len:%zd, flags:0x%x, addr_len:%p)\n",
2101 		 __func__, sk, msg, len, flags, addr_len);
2102 
2103 	if (unlikely(flags & MSG_ERRQUEUE))
2104 		return inet_recv_error(sk, msg, len, addr_len);
2105 
2106 	if (sk_can_busy_loop(sk) &&
2107 	    skb_queue_empty_lockless(&sk->sk_receive_queue))
2108 		sk_busy_loop(sk, flags & MSG_DONTWAIT);
2109 
2110 	lock_sock(sk);
2111 
2112 	if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED) &&
2113 	    !sctp_sstate(sk, CLOSING) && !sctp_sstate(sk, CLOSED)) {
2114 		err = -ENOTCONN;
2115 		goto out;
2116 	}
2117 
2118 	skb = sctp_skb_recv_datagram(sk, flags, &err);
2119 	if (!skb)
2120 		goto out;
2121 
2122 	/* Get the total length of the skb including any skb's in the
2123 	 * frag_list.
2124 	 */
2125 	skb_len = skb->len;
2126 
2127 	copied = skb_len;
2128 	if (copied > len)
2129 		copied = len;
2130 
2131 	err = skb_copy_datagram_msg(skb, 0, msg, copied);
2132 
2133 	event = sctp_skb2event(skb);
2134 
2135 	if (err)
2136 		goto out_free;
2137 
2138 	if (event->chunk && event->chunk->head_skb)
2139 		head_skb = event->chunk->head_skb;
2140 	else
2141 		head_skb = skb;
2142 	sock_recv_cmsgs(msg, sk, head_skb);
2143 	if (sctp_ulpevent_is_notification(event)) {
2144 		msg->msg_flags |= MSG_NOTIFICATION;
2145 		sp->pf->event_msgname(event, msg->msg_name, addr_len);
2146 	} else {
2147 		sp->pf->skb_msgname(head_skb, msg->msg_name, addr_len);
2148 	}
2149 
2150 	/* Check if we allow SCTP_NXTINFO. */
2151 	if (sp->recvnxtinfo)
2152 		sctp_ulpevent_read_nxtinfo(event, msg, sk);
2153 	/* Check if we allow SCTP_RCVINFO. */
2154 	if (sp->recvrcvinfo)
2155 		sctp_ulpevent_read_rcvinfo(event, msg);
2156 	/* Check if we allow SCTP_SNDRCVINFO. */
2157 	if (sctp_ulpevent_type_enabled(sp->subscribe, SCTP_DATA_IO_EVENT))
2158 		sctp_ulpevent_read_sndrcvinfo(event, msg);
2159 
2160 	err = copied;
2161 
2162 	/* If skb's length exceeds the user's buffer, update the skb and
2163 	 * push it back to the receive_queue so that the next call to
2164 	 * recvmsg() will return the remaining data. Don't set MSG_EOR.
2165 	 */
2166 	if (skb_len > copied) {
2167 		msg->msg_flags &= ~MSG_EOR;
2168 		if (flags & MSG_PEEK)
2169 			goto out_free;
2170 		sctp_skb_pull(skb, copied);
2171 		skb_queue_head(&sk->sk_receive_queue, skb);
2172 
2173 		/* When only partial message is copied to the user, increase
2174 		 * rwnd by that amount. If all the data in the skb is read,
2175 		 * rwnd is updated when the event is freed.
2176 		 */
2177 		if (!sctp_ulpevent_is_notification(event))
2178 			sctp_assoc_rwnd_increase(event->asoc, copied);
2179 		goto out;
2180 	} else if ((event->msg_flags & MSG_NOTIFICATION) ||
2181 		   (event->msg_flags & MSG_EOR))
2182 		msg->msg_flags |= MSG_EOR;
2183 	else
2184 		msg->msg_flags &= ~MSG_EOR;
2185 
2186 out_free:
2187 	if (flags & MSG_PEEK) {
2188 		/* Release the skb reference acquired after peeking the skb in
2189 		 * sctp_skb_recv_datagram().
2190 		 */
2191 		kfree_skb(skb);
2192 	} else {
2193 		/* Free the event which includes releasing the reference to
2194 		 * the owner of the skb, freeing the skb and updating the
2195 		 * rwnd.
2196 		 */
2197 		sctp_ulpevent_free(event);
2198 	}
2199 out:
2200 	release_sock(sk);
2201 	return err;
2202 }
2203 
2204 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2205  *
2206  * This option is a on/off flag.  If enabled no SCTP message
2207  * fragmentation will be performed.  Instead if a message being sent
2208  * exceeds the current PMTU size, the message will NOT be sent and
2209  * instead a error will be indicated to the user.
2210  */
2211 static int sctp_setsockopt_disable_fragments(struct sock *sk, int *val,
2212 					     unsigned int optlen)
2213 {
2214 	if (optlen < sizeof(int))
2215 		return -EINVAL;
2216 	sctp_sk(sk)->disable_fragments = (*val == 0) ? 0 : 1;
2217 	return 0;
2218 }
2219 
2220 static int sctp_setsockopt_events(struct sock *sk, __u8 *sn_type,
2221 				  unsigned int optlen)
2222 {
2223 	struct sctp_sock *sp = sctp_sk(sk);
2224 	struct sctp_association *asoc;
2225 	int i;
2226 
2227 	if (optlen > sizeof(struct sctp_event_subscribe))
2228 		return -EINVAL;
2229 
2230 	for (i = 0; i < optlen; i++)
2231 		sctp_ulpevent_type_set(&sp->subscribe, SCTP_SN_TYPE_BASE + i,
2232 				       sn_type[i]);
2233 
2234 	list_for_each_entry(asoc, &sp->ep->asocs, asocs)
2235 		asoc->subscribe = sctp_sk(sk)->subscribe;
2236 
2237 	/* At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2238 	 * if there is no data to be sent or retransmit, the stack will
2239 	 * immediately send up this notification.
2240 	 */
2241 	if (sctp_ulpevent_type_enabled(sp->subscribe, SCTP_SENDER_DRY_EVENT)) {
2242 		struct sctp_ulpevent *event;
2243 
2244 		asoc = sctp_id2assoc(sk, 0);
2245 		if (asoc && sctp_outq_is_empty(&asoc->outqueue)) {
2246 			event = sctp_ulpevent_make_sender_dry_event(asoc,
2247 					GFP_USER | __GFP_NOWARN);
2248 			if (!event)
2249 				return -ENOMEM;
2250 
2251 			asoc->stream.si->enqueue_event(&asoc->ulpq, event);
2252 		}
2253 	}
2254 
2255 	return 0;
2256 }
2257 
2258 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2259  *
2260  * This socket option is applicable to the UDP-style socket only.  When
2261  * set it will cause associations that are idle for more than the
2262  * specified number of seconds to automatically close.  An association
2263  * being idle is defined an association that has NOT sent or received
2264  * user data.  The special value of '0' indicates that no automatic
2265  * close of any associations should be performed.  The option expects an
2266  * integer defining the number of seconds of idle time before an
2267  * association is closed.
2268  */
2269 static int sctp_setsockopt_autoclose(struct sock *sk, u32 *optval,
2270 				     unsigned int optlen)
2271 {
2272 	struct sctp_sock *sp = sctp_sk(sk);
2273 	struct net *net = sock_net(sk);
2274 
2275 	/* Applicable to UDP-style socket only */
2276 	if (sctp_style(sk, TCP))
2277 		return -EOPNOTSUPP;
2278 	if (optlen != sizeof(int))
2279 		return -EINVAL;
2280 
2281 	sp->autoclose = *optval;
2282 	if (sp->autoclose > net->sctp.max_autoclose)
2283 		sp->autoclose = net->sctp.max_autoclose;
2284 
2285 	return 0;
2286 }
2287 
2288 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2289  *
2290  * Applications can enable or disable heartbeats for any peer address of
2291  * an association, modify an address's heartbeat interval, force a
2292  * heartbeat to be sent immediately, and adjust the address's maximum
2293  * number of retransmissions sent before an address is considered
2294  * unreachable.  The following structure is used to access and modify an
2295  * address's parameters:
2296  *
2297  *  struct sctp_paddrparams {
2298  *     sctp_assoc_t            spp_assoc_id;
2299  *     struct sockaddr_storage spp_address;
2300  *     uint32_t                spp_hbinterval;
2301  *     uint16_t                spp_pathmaxrxt;
2302  *     uint32_t                spp_pathmtu;
2303  *     uint32_t                spp_sackdelay;
2304  *     uint32_t                spp_flags;
2305  *     uint32_t                spp_ipv6_flowlabel;
2306  *     uint8_t                 spp_dscp;
2307  * };
2308  *
2309  *   spp_assoc_id    - (one-to-many style socket) This is filled in the
2310  *                     application, and identifies the association for
2311  *                     this query.
2312  *   spp_address     - This specifies which address is of interest.
2313  *   spp_hbinterval  - This contains the value of the heartbeat interval,
2314  *                     in milliseconds.  If a  value of zero
2315  *                     is present in this field then no changes are to
2316  *                     be made to this parameter.
2317  *   spp_pathmaxrxt  - This contains the maximum number of
2318  *                     retransmissions before this address shall be
2319  *                     considered unreachable. If a  value of zero
2320  *                     is present in this field then no changes are to
2321  *                     be made to this parameter.
2322  *   spp_pathmtu     - When Path MTU discovery is disabled the value
2323  *                     specified here will be the "fixed" path mtu.
2324  *                     Note that if the spp_address field is empty
2325  *                     then all associations on this address will
2326  *                     have this fixed path mtu set upon them.
2327  *
2328  *   spp_sackdelay   - When delayed sack is enabled, this value specifies
2329  *                     the number of milliseconds that sacks will be delayed
2330  *                     for. This value will apply to all addresses of an
2331  *                     association if the spp_address field is empty. Note
2332  *                     also, that if delayed sack is enabled and this
2333  *                     value is set to 0, no change is made to the last
2334  *                     recorded delayed sack timer value.
2335  *
2336  *   spp_flags       - These flags are used to control various features
2337  *                     on an association. The flag field may contain
2338  *                     zero or more of the following options.
2339  *
2340  *                     SPP_HB_ENABLE  - Enable heartbeats on the
2341  *                     specified address. Note that if the address
2342  *                     field is empty all addresses for the association
2343  *                     have heartbeats enabled upon them.
2344  *
2345  *                     SPP_HB_DISABLE - Disable heartbeats on the
2346  *                     speicifed address. Note that if the address
2347  *                     field is empty all addresses for the association
2348  *                     will have their heartbeats disabled. Note also
2349  *                     that SPP_HB_ENABLE and SPP_HB_DISABLE are
2350  *                     mutually exclusive, only one of these two should
2351  *                     be specified. Enabling both fields will have
2352  *                     undetermined results.
2353  *
2354  *                     SPP_HB_DEMAND - Request a user initiated heartbeat
2355  *                     to be made immediately.
2356  *
2357  *                     SPP_HB_TIME_IS_ZERO - Specify's that the time for
2358  *                     heartbeat delayis to be set to the value of 0
2359  *                     milliseconds.
2360  *
2361  *                     SPP_PMTUD_ENABLE - This field will enable PMTU
2362  *                     discovery upon the specified address. Note that
2363  *                     if the address feild is empty then all addresses
2364  *                     on the association are effected.
2365  *
2366  *                     SPP_PMTUD_DISABLE - This field will disable PMTU
2367  *                     discovery upon the specified address. Note that
2368  *                     if the address feild is empty then all addresses
2369  *                     on the association are effected. Not also that
2370  *                     SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2371  *                     exclusive. Enabling both will have undetermined
2372  *                     results.
2373  *
2374  *                     SPP_SACKDELAY_ENABLE - Setting this flag turns
2375  *                     on delayed sack. The time specified in spp_sackdelay
2376  *                     is used to specify the sack delay for this address. Note
2377  *                     that if spp_address is empty then all addresses will
2378  *                     enable delayed sack and take on the sack delay
2379  *                     value specified in spp_sackdelay.
2380  *                     SPP_SACKDELAY_DISABLE - Setting this flag turns
2381  *                     off delayed sack. If the spp_address field is blank then
2382  *                     delayed sack is disabled for the entire association. Note
2383  *                     also that this field is mutually exclusive to
2384  *                     SPP_SACKDELAY_ENABLE, setting both will have undefined
2385  *                     results.
2386  *
2387  *                     SPP_IPV6_FLOWLABEL:  Setting this flag enables the
2388  *                     setting of the IPV6 flow label value.  The value is
2389  *                     contained in the spp_ipv6_flowlabel field.
2390  *                     Upon retrieval, this flag will be set to indicate that
2391  *                     the spp_ipv6_flowlabel field has a valid value returned.
2392  *                     If a specific destination address is set (in the
2393  *                     spp_address field), then the value returned is that of
2394  *                     the address.  If just an association is specified (and
2395  *                     no address), then the association's default flow label
2396  *                     is returned.  If neither an association nor a destination
2397  *                     is specified, then the socket's default flow label is
2398  *                     returned.  For non-IPv6 sockets, this flag will be left
2399  *                     cleared.
2400  *
2401  *                     SPP_DSCP:  Setting this flag enables the setting of the
2402  *                     Differentiated Services Code Point (DSCP) value
2403  *                     associated with either the association or a specific
2404  *                     address.  The value is obtained in the spp_dscp field.
2405  *                     Upon retrieval, this flag will be set to indicate that
2406  *                     the spp_dscp field has a valid value returned.  If a
2407  *                     specific destination address is set when called (in the
2408  *                     spp_address field), then that specific destination
2409  *                     address's DSCP value is returned.  If just an association
2410  *                     is specified, then the association's default DSCP is
2411  *                     returned.  If neither an association nor a destination is
2412  *                     specified, then the socket's default DSCP is returned.
2413  *
2414  *   spp_ipv6_flowlabel
2415  *                   - This field is used in conjunction with the
2416  *                     SPP_IPV6_FLOWLABEL flag and contains the IPv6 flow label.
2417  *                     The 20 least significant bits are used for the flow
2418  *                     label.  This setting has precedence over any IPv6-layer
2419  *                     setting.
2420  *
2421  *   spp_dscp        - This field is used in conjunction with the SPP_DSCP flag
2422  *                     and contains the DSCP.  The 6 most significant bits are
2423  *                     used for the DSCP.  This setting has precedence over any
2424  *                     IPv4- or IPv6- layer setting.
2425  */
2426 static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2427 				       struct sctp_transport   *trans,
2428 				       struct sctp_association *asoc,
2429 				       struct sctp_sock        *sp,
2430 				       int                      hb_change,
2431 				       int                      pmtud_change,
2432 				       int                      sackdelay_change)
2433 {
2434 	int error;
2435 
2436 	if (params->spp_flags & SPP_HB_DEMAND && trans) {
2437 		error = sctp_primitive_REQUESTHEARTBEAT(trans->asoc->base.net,
2438 							trans->asoc, trans);
2439 		if (error)
2440 			return error;
2441 	}
2442 
2443 	/* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2444 	 * this field is ignored.  Note also that a value of zero indicates
2445 	 * the current setting should be left unchanged.
2446 	 */
2447 	if (params->spp_flags & SPP_HB_ENABLE) {
2448 
2449 		/* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2450 		 * set.  This lets us use 0 value when this flag
2451 		 * is set.
2452 		 */
2453 		if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2454 			params->spp_hbinterval = 0;
2455 
2456 		if (params->spp_hbinterval ||
2457 		    (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2458 			if (trans) {
2459 				trans->hbinterval =
2460 				    msecs_to_jiffies(params->spp_hbinterval);
2461 				sctp_transport_reset_hb_timer(trans);
2462 			} else if (asoc) {
2463 				asoc->hbinterval =
2464 				    msecs_to_jiffies(params->spp_hbinterval);
2465 			} else {
2466 				sp->hbinterval = params->spp_hbinterval;
2467 			}
2468 		}
2469 	}
2470 
2471 	if (hb_change) {
2472 		if (trans) {
2473 			trans->param_flags =
2474 				(trans->param_flags & ~SPP_HB) | hb_change;
2475 		} else if (asoc) {
2476 			asoc->param_flags =
2477 				(asoc->param_flags & ~SPP_HB) | hb_change;
2478 		} else {
2479 			sp->param_flags =
2480 				(sp->param_flags & ~SPP_HB) | hb_change;
2481 		}
2482 	}
2483 
2484 	/* When Path MTU discovery is disabled the value specified here will
2485 	 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2486 	 * include the flag SPP_PMTUD_DISABLE for this field to have any
2487 	 * effect).
2488 	 */
2489 	if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
2490 		if (trans) {
2491 			trans->pathmtu = params->spp_pathmtu;
2492 			sctp_assoc_sync_pmtu(asoc);
2493 		} else if (asoc) {
2494 			sctp_assoc_set_pmtu(asoc, params->spp_pathmtu);
2495 		} else {
2496 			sp->pathmtu = params->spp_pathmtu;
2497 		}
2498 	}
2499 
2500 	if (pmtud_change) {
2501 		if (trans) {
2502 			int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2503 				(params->spp_flags & SPP_PMTUD_ENABLE);
2504 			trans->param_flags =
2505 				(trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2506 			if (update) {
2507 				sctp_transport_pmtu(trans, sctp_opt2sk(sp));
2508 				sctp_assoc_sync_pmtu(asoc);
2509 			}
2510 			sctp_transport_pl_reset(trans);
2511 		} else if (asoc) {
2512 			asoc->param_flags =
2513 				(asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2514 		} else {
2515 			sp->param_flags =
2516 				(sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2517 		}
2518 	}
2519 
2520 	/* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2521 	 * value of this field is ignored.  Note also that a value of zero
2522 	 * indicates the current setting should be left unchanged.
2523 	 */
2524 	if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
2525 		if (trans) {
2526 			trans->sackdelay =
2527 				msecs_to_jiffies(params->spp_sackdelay);
2528 		} else if (asoc) {
2529 			asoc->sackdelay =
2530 				msecs_to_jiffies(params->spp_sackdelay);
2531 		} else {
2532 			sp->sackdelay = params->spp_sackdelay;
2533 		}
2534 	}
2535 
2536 	if (sackdelay_change) {
2537 		if (trans) {
2538 			trans->param_flags =
2539 				(trans->param_flags & ~SPP_SACKDELAY) |
2540 				sackdelay_change;
2541 		} else if (asoc) {
2542 			asoc->param_flags =
2543 				(asoc->param_flags & ~SPP_SACKDELAY) |
2544 				sackdelay_change;
2545 		} else {
2546 			sp->param_flags =
2547 				(sp->param_flags & ~SPP_SACKDELAY) |
2548 				sackdelay_change;
2549 		}
2550 	}
2551 
2552 	/* Note that a value of zero indicates the current setting should be
2553 	   left unchanged.
2554 	 */
2555 	if (params->spp_pathmaxrxt) {
2556 		if (trans) {
2557 			trans->pathmaxrxt = params->spp_pathmaxrxt;
2558 		} else if (asoc) {
2559 			asoc->pathmaxrxt = params->spp_pathmaxrxt;
2560 		} else {
2561 			sp->pathmaxrxt = params->spp_pathmaxrxt;
2562 		}
2563 	}
2564 
2565 	if (params->spp_flags & SPP_IPV6_FLOWLABEL) {
2566 		if (trans) {
2567 			if (trans->ipaddr.sa.sa_family == AF_INET6) {
2568 				trans->flowlabel = params->spp_ipv6_flowlabel &
2569 						   SCTP_FLOWLABEL_VAL_MASK;
2570 				trans->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2571 			}
2572 		} else if (asoc) {
2573 			struct sctp_transport *t;
2574 
2575 			list_for_each_entry(t, &asoc->peer.transport_addr_list,
2576 					    transports) {
2577 				if (t->ipaddr.sa.sa_family != AF_INET6)
2578 					continue;
2579 				t->flowlabel = params->spp_ipv6_flowlabel &
2580 					       SCTP_FLOWLABEL_VAL_MASK;
2581 				t->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2582 			}
2583 			asoc->flowlabel = params->spp_ipv6_flowlabel &
2584 					  SCTP_FLOWLABEL_VAL_MASK;
2585 			asoc->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2586 		} else if (sctp_opt2sk(sp)->sk_family == AF_INET6) {
2587 			sp->flowlabel = params->spp_ipv6_flowlabel &
2588 					SCTP_FLOWLABEL_VAL_MASK;
2589 			sp->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2590 		}
2591 	}
2592 
2593 	if (params->spp_flags & SPP_DSCP) {
2594 		if (trans) {
2595 			trans->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2596 			trans->dscp |= SCTP_DSCP_SET_MASK;
2597 		} else if (asoc) {
2598 			struct sctp_transport *t;
2599 
2600 			list_for_each_entry(t, &asoc->peer.transport_addr_list,
2601 					    transports) {
2602 				t->dscp = params->spp_dscp &
2603 					  SCTP_DSCP_VAL_MASK;
2604 				t->dscp |= SCTP_DSCP_SET_MASK;
2605 			}
2606 			asoc->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2607 			asoc->dscp |= SCTP_DSCP_SET_MASK;
2608 		} else {
2609 			sp->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2610 			sp->dscp |= SCTP_DSCP_SET_MASK;
2611 		}
2612 	}
2613 
2614 	return 0;
2615 }
2616 
2617 static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2618 					    struct sctp_paddrparams *params,
2619 					    unsigned int optlen)
2620 {
2621 	struct sctp_transport   *trans = NULL;
2622 	struct sctp_association *asoc = NULL;
2623 	struct sctp_sock        *sp = sctp_sk(sk);
2624 	int error;
2625 	int hb_change, pmtud_change, sackdelay_change;
2626 
2627 	if (optlen == ALIGN(offsetof(struct sctp_paddrparams,
2628 					    spp_ipv6_flowlabel), 4)) {
2629 		if (params->spp_flags & (SPP_DSCP | SPP_IPV6_FLOWLABEL))
2630 			return -EINVAL;
2631 	} else if (optlen != sizeof(*params)) {
2632 		return -EINVAL;
2633 	}
2634 
2635 	/* Validate flags and value parameters. */
2636 	hb_change        = params->spp_flags & SPP_HB;
2637 	pmtud_change     = params->spp_flags & SPP_PMTUD;
2638 	sackdelay_change = params->spp_flags & SPP_SACKDELAY;
2639 
2640 	if (hb_change        == SPP_HB ||
2641 	    pmtud_change     == SPP_PMTUD ||
2642 	    sackdelay_change == SPP_SACKDELAY ||
2643 	    params->spp_sackdelay > 500 ||
2644 	    (params->spp_pathmtu &&
2645 	     params->spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2646 		return -EINVAL;
2647 
2648 	/* If an address other than INADDR_ANY is specified, and
2649 	 * no transport is found, then the request is invalid.
2650 	 */
2651 	if (!sctp_is_any(sk, (union sctp_addr *)&params->spp_address)) {
2652 		trans = sctp_addr_id2transport(sk, &params->spp_address,
2653 					       params->spp_assoc_id);
2654 		if (!trans)
2655 			return -EINVAL;
2656 	}
2657 
2658 	/* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
2659 	 * socket is a one to many style socket, and an association
2660 	 * was not found, then the id was invalid.
2661 	 */
2662 	asoc = sctp_id2assoc(sk, params->spp_assoc_id);
2663 	if (!asoc && params->spp_assoc_id != SCTP_FUTURE_ASSOC &&
2664 	    sctp_style(sk, UDP))
2665 		return -EINVAL;
2666 
2667 	/* Heartbeat demand can only be sent on a transport or
2668 	 * association, but not a socket.
2669 	 */
2670 	if (params->spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2671 		return -EINVAL;
2672 
2673 	/* Process parameters. */
2674 	error = sctp_apply_peer_addr_params(params, trans, asoc, sp,
2675 					    hb_change, pmtud_change,
2676 					    sackdelay_change);
2677 
2678 	if (error)
2679 		return error;
2680 
2681 	/* If changes are for association, also apply parameters to each
2682 	 * transport.
2683 	 */
2684 	if (!trans && asoc) {
2685 		list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2686 				transports) {
2687 			sctp_apply_peer_addr_params(params, trans, asoc, sp,
2688 						    hb_change, pmtud_change,
2689 						    sackdelay_change);
2690 		}
2691 	}
2692 
2693 	return 0;
2694 }
2695 
2696 static inline __u32 sctp_spp_sackdelay_enable(__u32 param_flags)
2697 {
2698 	return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_ENABLE;
2699 }
2700 
2701 static inline __u32 sctp_spp_sackdelay_disable(__u32 param_flags)
2702 {
2703 	return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_DISABLE;
2704 }
2705 
2706 static void sctp_apply_asoc_delayed_ack(struct sctp_sack_info *params,
2707 					struct sctp_association *asoc)
2708 {
2709 	struct sctp_transport *trans;
2710 
2711 	if (params->sack_delay) {
2712 		asoc->sackdelay = msecs_to_jiffies(params->sack_delay);
2713 		asoc->param_flags =
2714 			sctp_spp_sackdelay_enable(asoc->param_flags);
2715 	}
2716 	if (params->sack_freq == 1) {
2717 		asoc->param_flags =
2718 			sctp_spp_sackdelay_disable(asoc->param_flags);
2719 	} else if (params->sack_freq > 1) {
2720 		asoc->sackfreq = params->sack_freq;
2721 		asoc->param_flags =
2722 			sctp_spp_sackdelay_enable(asoc->param_flags);
2723 	}
2724 
2725 	list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2726 			    transports) {
2727 		if (params->sack_delay) {
2728 			trans->sackdelay = msecs_to_jiffies(params->sack_delay);
2729 			trans->param_flags =
2730 				sctp_spp_sackdelay_enable(trans->param_flags);
2731 		}
2732 		if (params->sack_freq == 1) {
2733 			trans->param_flags =
2734 				sctp_spp_sackdelay_disable(trans->param_flags);
2735 		} else if (params->sack_freq > 1) {
2736 			trans->sackfreq = params->sack_freq;
2737 			trans->param_flags =
2738 				sctp_spp_sackdelay_enable(trans->param_flags);
2739 		}
2740 	}
2741 }
2742 
2743 /*
2744  * 7.1.23.  Get or set delayed ack timer (SCTP_DELAYED_SACK)
2745  *
2746  * This option will effect the way delayed acks are performed.  This
2747  * option allows you to get or set the delayed ack time, in
2748  * milliseconds.  It also allows changing the delayed ack frequency.
2749  * Changing the frequency to 1 disables the delayed sack algorithm.  If
2750  * the assoc_id is 0, then this sets or gets the endpoints default
2751  * values.  If the assoc_id field is non-zero, then the set or get
2752  * effects the specified association for the one to many model (the
2753  * assoc_id field is ignored by the one to one model).  Note that if
2754  * sack_delay or sack_freq are 0 when setting this option, then the
2755  * current values will remain unchanged.
2756  *
2757  * struct sctp_sack_info {
2758  *     sctp_assoc_t            sack_assoc_id;
2759  *     uint32_t                sack_delay;
2760  *     uint32_t                sack_freq;
2761  * };
2762  *
2763  * sack_assoc_id -  This parameter, indicates which association the user
2764  *    is performing an action upon.  Note that if this field's value is
2765  *    zero then the endpoints default value is changed (effecting future
2766  *    associations only).
2767  *
2768  * sack_delay -  This parameter contains the number of milliseconds that
2769  *    the user is requesting the delayed ACK timer be set to.  Note that
2770  *    this value is defined in the standard to be between 200 and 500
2771  *    milliseconds.
2772  *
2773  * sack_freq -  This parameter contains the number of packets that must
2774  *    be received before a sack is sent without waiting for the delay
2775  *    timer to expire.  The default value for this is 2, setting this
2776  *    value to 1 will disable the delayed sack algorithm.
2777  */
2778 static int __sctp_setsockopt_delayed_ack(struct sock *sk,
2779 					 struct sctp_sack_info *params)
2780 {
2781 	struct sctp_sock *sp = sctp_sk(sk);
2782 	struct sctp_association *asoc;
2783 
2784 	/* Validate value parameter. */
2785 	if (params->sack_delay > 500)
2786 		return -EINVAL;
2787 
2788 	/* Get association, if sack_assoc_id != SCTP_FUTURE_ASSOC and the
2789 	 * socket is a one to many style socket, and an association
2790 	 * was not found, then the id was invalid.
2791 	 */
2792 	asoc = sctp_id2assoc(sk, params->sack_assoc_id);
2793 	if (!asoc && params->sack_assoc_id > SCTP_ALL_ASSOC &&
2794 	    sctp_style(sk, UDP))
2795 		return -EINVAL;
2796 
2797 	if (asoc) {
2798 		sctp_apply_asoc_delayed_ack(params, asoc);
2799 
2800 		return 0;
2801 	}
2802 
2803 	if (sctp_style(sk, TCP))
2804 		params->sack_assoc_id = SCTP_FUTURE_ASSOC;
2805 
2806 	if (params->sack_assoc_id == SCTP_FUTURE_ASSOC ||
2807 	    params->sack_assoc_id == SCTP_ALL_ASSOC) {
2808 		if (params->sack_delay) {
2809 			sp->sackdelay = params->sack_delay;
2810 			sp->param_flags =
2811 				sctp_spp_sackdelay_enable(sp->param_flags);
2812 		}
2813 		if (params->sack_freq == 1) {
2814 			sp->param_flags =
2815 				sctp_spp_sackdelay_disable(sp->param_flags);
2816 		} else if (params->sack_freq > 1) {
2817 			sp->sackfreq = params->sack_freq;
2818 			sp->param_flags =
2819 				sctp_spp_sackdelay_enable(sp->param_flags);
2820 		}
2821 	}
2822 
2823 	if (params->sack_assoc_id == SCTP_CURRENT_ASSOC ||
2824 	    params->sack_assoc_id == SCTP_ALL_ASSOC)
2825 		list_for_each_entry(asoc, &sp->ep->asocs, asocs)
2826 			sctp_apply_asoc_delayed_ack(params, asoc);
2827 
2828 	return 0;
2829 }
2830 
2831 static int sctp_setsockopt_delayed_ack(struct sock *sk,
2832 				       struct sctp_sack_info *params,
2833 				       unsigned int optlen)
2834 {
2835 	if (optlen == sizeof(struct sctp_assoc_value)) {
2836 		struct sctp_assoc_value *v = (struct sctp_assoc_value *)params;
2837 		struct sctp_sack_info p;
2838 
2839 		pr_warn_ratelimited(DEPRECATED
2840 				    "%s (pid %d) "
2841 				    "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
2842 				    "Use struct sctp_sack_info instead\n",
2843 				    current->comm, task_pid_nr(current));
2844 
2845 		p.sack_assoc_id = v->assoc_id;
2846 		p.sack_delay = v->assoc_value;
2847 		p.sack_freq = v->assoc_value ? 0 : 1;
2848 		return __sctp_setsockopt_delayed_ack(sk, &p);
2849 	}
2850 
2851 	if (optlen != sizeof(struct sctp_sack_info))
2852 		return -EINVAL;
2853 	if (params->sack_delay == 0 && params->sack_freq == 0)
2854 		return 0;
2855 	return __sctp_setsockopt_delayed_ack(sk, params);
2856 }
2857 
2858 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2859  *
2860  * Applications can specify protocol parameters for the default association
2861  * initialization.  The option name argument to setsockopt() and getsockopt()
2862  * is SCTP_INITMSG.
2863  *
2864  * Setting initialization parameters is effective only on an unconnected
2865  * socket (for UDP-style sockets only future associations are effected
2866  * by the change).  With TCP-style sockets, this option is inherited by
2867  * sockets derived from a listener socket.
2868  */
2869 static int sctp_setsockopt_initmsg(struct sock *sk, struct sctp_initmsg *sinit,
2870 				   unsigned int optlen)
2871 {
2872 	struct sctp_sock *sp = sctp_sk(sk);
2873 
2874 	if (optlen != sizeof(struct sctp_initmsg))
2875 		return -EINVAL;
2876 
2877 	if (sinit->sinit_num_ostreams)
2878 		sp->initmsg.sinit_num_ostreams = sinit->sinit_num_ostreams;
2879 	if (sinit->sinit_max_instreams)
2880 		sp->initmsg.sinit_max_instreams = sinit->sinit_max_instreams;
2881 	if (sinit->sinit_max_attempts)
2882 		sp->initmsg.sinit_max_attempts = sinit->sinit_max_attempts;
2883 	if (sinit->sinit_max_init_timeo)
2884 		sp->initmsg.sinit_max_init_timeo = sinit->sinit_max_init_timeo;
2885 
2886 	return 0;
2887 }
2888 
2889 /*
2890  * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2891  *
2892  *   Applications that wish to use the sendto() system call may wish to
2893  *   specify a default set of parameters that would normally be supplied
2894  *   through the inclusion of ancillary data.  This socket option allows
2895  *   such an application to set the default sctp_sndrcvinfo structure.
2896  *   The application that wishes to use this socket option simply passes
2897  *   in to this call the sctp_sndrcvinfo structure defined in Section
2898  *   5.2.2) The input parameters accepted by this call include
2899  *   sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2900  *   sinfo_timetolive.  The user must provide the sinfo_assoc_id field in
2901  *   to this call if the caller is using the UDP model.
2902  */
2903 static int sctp_setsockopt_default_send_param(struct sock *sk,
2904 					      struct sctp_sndrcvinfo *info,
2905 					      unsigned int optlen)
2906 {
2907 	struct sctp_sock *sp = sctp_sk(sk);
2908 	struct sctp_association *asoc;
2909 
2910 	if (optlen != sizeof(*info))
2911 		return -EINVAL;
2912 	if (info->sinfo_flags &
2913 	    ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2914 	      SCTP_ABORT | SCTP_EOF))
2915 		return -EINVAL;
2916 
2917 	asoc = sctp_id2assoc(sk, info->sinfo_assoc_id);
2918 	if (!asoc && info->sinfo_assoc_id > SCTP_ALL_ASSOC &&
2919 	    sctp_style(sk, UDP))
2920 		return -EINVAL;
2921 
2922 	if (asoc) {
2923 		asoc->default_stream = info->sinfo_stream;
2924 		asoc->default_flags = info->sinfo_flags;
2925 		asoc->default_ppid = info->sinfo_ppid;
2926 		asoc->default_context = info->sinfo_context;
2927 		asoc->default_timetolive = info->sinfo_timetolive;
2928 
2929 		return 0;
2930 	}
2931 
2932 	if (sctp_style(sk, TCP))
2933 		info->sinfo_assoc_id = SCTP_FUTURE_ASSOC;
2934 
2935 	if (info->sinfo_assoc_id == SCTP_FUTURE_ASSOC ||
2936 	    info->sinfo_assoc_id == SCTP_ALL_ASSOC) {
2937 		sp->default_stream = info->sinfo_stream;
2938 		sp->default_flags = info->sinfo_flags;
2939 		sp->default_ppid = info->sinfo_ppid;
2940 		sp->default_context = info->sinfo_context;
2941 		sp->default_timetolive = info->sinfo_timetolive;
2942 	}
2943 
2944 	if (info->sinfo_assoc_id == SCTP_CURRENT_ASSOC ||
2945 	    info->sinfo_assoc_id == SCTP_ALL_ASSOC) {
2946 		list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
2947 			asoc->default_stream = info->sinfo_stream;
2948 			asoc->default_flags = info->sinfo_flags;
2949 			asoc->default_ppid = info->sinfo_ppid;
2950 			asoc->default_context = info->sinfo_context;
2951 			asoc->default_timetolive = info->sinfo_timetolive;
2952 		}
2953 	}
2954 
2955 	return 0;
2956 }
2957 
2958 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
2959  * (SCTP_DEFAULT_SNDINFO)
2960  */
2961 static int sctp_setsockopt_default_sndinfo(struct sock *sk,
2962 					   struct sctp_sndinfo *info,
2963 					   unsigned int optlen)
2964 {
2965 	struct sctp_sock *sp = sctp_sk(sk);
2966 	struct sctp_association *asoc;
2967 
2968 	if (optlen != sizeof(*info))
2969 		return -EINVAL;
2970 	if (info->snd_flags &
2971 	    ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2972 	      SCTP_ABORT | SCTP_EOF))
2973 		return -EINVAL;
2974 
2975 	asoc = sctp_id2assoc(sk, info->snd_assoc_id);
2976 	if (!asoc && info->snd_assoc_id > SCTP_ALL_ASSOC &&
2977 	    sctp_style(sk, UDP))
2978 		return -EINVAL;
2979 
2980 	if (asoc) {
2981 		asoc->default_stream = info->snd_sid;
2982 		asoc->default_flags = info->snd_flags;
2983 		asoc->default_ppid = info->snd_ppid;
2984 		asoc->default_context = info->snd_context;
2985 
2986 		return 0;
2987 	}
2988 
2989 	if (sctp_style(sk, TCP))
2990 		info->snd_assoc_id = SCTP_FUTURE_ASSOC;
2991 
2992 	if (info->snd_assoc_id == SCTP_FUTURE_ASSOC ||
2993 	    info->snd_assoc_id == SCTP_ALL_ASSOC) {
2994 		sp->default_stream = info->snd_sid;
2995 		sp->default_flags = info->snd_flags;
2996 		sp->default_ppid = info->snd_ppid;
2997 		sp->default_context = info->snd_context;
2998 	}
2999 
3000 	if (info->snd_assoc_id == SCTP_CURRENT_ASSOC ||
3001 	    info->snd_assoc_id == SCTP_ALL_ASSOC) {
3002 		list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
3003 			asoc->default_stream = info->snd_sid;
3004 			asoc->default_flags = info->snd_flags;
3005 			asoc->default_ppid = info->snd_ppid;
3006 			asoc->default_context = info->snd_context;
3007 		}
3008 	}
3009 
3010 	return 0;
3011 }
3012 
3013 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
3014  *
3015  * Requests that the local SCTP stack use the enclosed peer address as
3016  * the association primary.  The enclosed address must be one of the
3017  * association peer's addresses.
3018  */
3019 static int sctp_setsockopt_primary_addr(struct sock *sk, struct sctp_prim *prim,
3020 					unsigned int optlen)
3021 {
3022 	struct sctp_transport *trans;
3023 	struct sctp_af *af;
3024 	int err;
3025 
3026 	if (optlen != sizeof(struct sctp_prim))
3027 		return -EINVAL;
3028 
3029 	/* Allow security module to validate address but need address len. */
3030 	af = sctp_get_af_specific(prim->ssp_addr.ss_family);
3031 	if (!af)
3032 		return -EINVAL;
3033 
3034 	err = security_sctp_bind_connect(sk, SCTP_PRIMARY_ADDR,
3035 					 (struct sockaddr *)&prim->ssp_addr,
3036 					 af->sockaddr_len);
3037 	if (err)
3038 		return err;
3039 
3040 	trans = sctp_addr_id2transport(sk, &prim->ssp_addr, prim->ssp_assoc_id);
3041 	if (!trans)
3042 		return -EINVAL;
3043 
3044 	sctp_assoc_set_primary(trans->asoc, trans);
3045 
3046 	return 0;
3047 }
3048 
3049 /*
3050  * 7.1.5 SCTP_NODELAY
3051  *
3052  * Turn on/off any Nagle-like algorithm.  This means that packets are
3053  * generally sent as soon as possible and no unnecessary delays are
3054  * introduced, at the cost of more packets in the network.  Expects an
3055  *  integer boolean flag.
3056  */
3057 static int sctp_setsockopt_nodelay(struct sock *sk, int *val,
3058 				   unsigned int optlen)
3059 {
3060 	if (optlen < sizeof(int))
3061 		return -EINVAL;
3062 	sctp_sk(sk)->nodelay = (*val == 0) ? 0 : 1;
3063 	return 0;
3064 }
3065 
3066 /*
3067  *
3068  * 7.1.1 SCTP_RTOINFO
3069  *
3070  * The protocol parameters used to initialize and bound retransmission
3071  * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
3072  * and modify these parameters.
3073  * All parameters are time values, in milliseconds.  A value of 0, when
3074  * modifying the parameters, indicates that the current value should not
3075  * be changed.
3076  *
3077  */
3078 static int sctp_setsockopt_rtoinfo(struct sock *sk,
3079 				   struct sctp_rtoinfo *rtoinfo,
3080 				   unsigned int optlen)
3081 {
3082 	struct sctp_association *asoc;
3083 	unsigned long rto_min, rto_max;
3084 	struct sctp_sock *sp = sctp_sk(sk);
3085 
3086 	if (optlen != sizeof (struct sctp_rtoinfo))
3087 		return -EINVAL;
3088 
3089 	asoc = sctp_id2assoc(sk, rtoinfo->srto_assoc_id);
3090 
3091 	/* Set the values to the specific association */
3092 	if (!asoc && rtoinfo->srto_assoc_id != SCTP_FUTURE_ASSOC &&
3093 	    sctp_style(sk, UDP))
3094 		return -EINVAL;
3095 
3096 	rto_max = rtoinfo->srto_max;
3097 	rto_min = rtoinfo->srto_min;
3098 
3099 	if (rto_max)
3100 		rto_max = asoc ? msecs_to_jiffies(rto_max) : rto_max;
3101 	else
3102 		rto_max = asoc ? asoc->rto_max : sp->rtoinfo.srto_max;
3103 
3104 	if (rto_min)
3105 		rto_min = asoc ? msecs_to_jiffies(rto_min) : rto_min;
3106 	else
3107 		rto_min = asoc ? asoc->rto_min : sp->rtoinfo.srto_min;
3108 
3109 	if (rto_min > rto_max)
3110 		return -EINVAL;
3111 
3112 	if (asoc) {
3113 		if (rtoinfo->srto_initial != 0)
3114 			asoc->rto_initial =
3115 				msecs_to_jiffies(rtoinfo->srto_initial);
3116 		asoc->rto_max = rto_max;
3117 		asoc->rto_min = rto_min;
3118 	} else {
3119 		/* If there is no association or the association-id = 0
3120 		 * set the values to the endpoint.
3121 		 */
3122 		if (rtoinfo->srto_initial != 0)
3123 			sp->rtoinfo.srto_initial = rtoinfo->srto_initial;
3124 		sp->rtoinfo.srto_max = rto_max;
3125 		sp->rtoinfo.srto_min = rto_min;
3126 	}
3127 
3128 	return 0;
3129 }
3130 
3131 /*
3132  *
3133  * 7.1.2 SCTP_ASSOCINFO
3134  *
3135  * This option is used to tune the maximum retransmission attempts
3136  * of the association.
3137  * Returns an error if the new association retransmission value is
3138  * greater than the sum of the retransmission value  of the peer.
3139  * See [SCTP] for more information.
3140  *
3141  */
3142 static int sctp_setsockopt_associnfo(struct sock *sk,
3143 				     struct sctp_assocparams *assocparams,
3144 				     unsigned int optlen)
3145 {
3146 
3147 	struct sctp_association *asoc;
3148 
3149 	if (optlen != sizeof(struct sctp_assocparams))
3150 		return -EINVAL;
3151 
3152 	asoc = sctp_id2assoc(sk, assocparams->sasoc_assoc_id);
3153 
3154 	if (!asoc && assocparams->sasoc_assoc_id != SCTP_FUTURE_ASSOC &&
3155 	    sctp_style(sk, UDP))
3156 		return -EINVAL;
3157 
3158 	/* Set the values to the specific association */
3159 	if (asoc) {
3160 		if (assocparams->sasoc_asocmaxrxt != 0) {
3161 			__u32 path_sum = 0;
3162 			int   paths = 0;
3163 			struct sctp_transport *peer_addr;
3164 
3165 			list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
3166 					transports) {
3167 				path_sum += peer_addr->pathmaxrxt;
3168 				paths++;
3169 			}
3170 
3171 			/* Only validate asocmaxrxt if we have more than
3172 			 * one path/transport.  We do this because path
3173 			 * retransmissions are only counted when we have more
3174 			 * then one path.
3175 			 */
3176 			if (paths > 1 &&
3177 			    assocparams->sasoc_asocmaxrxt > path_sum)
3178 				return -EINVAL;
3179 
3180 			asoc->max_retrans = assocparams->sasoc_asocmaxrxt;
3181 		}
3182 
3183 		if (assocparams->sasoc_cookie_life != 0)
3184 			asoc->cookie_life =
3185 				ms_to_ktime(assocparams->sasoc_cookie_life);
3186 	} else {
3187 		/* Set the values to the endpoint */
3188 		struct sctp_sock *sp = sctp_sk(sk);
3189 
3190 		if (assocparams->sasoc_asocmaxrxt != 0)
3191 			sp->assocparams.sasoc_asocmaxrxt =
3192 						assocparams->sasoc_asocmaxrxt;
3193 		if (assocparams->sasoc_cookie_life != 0)
3194 			sp->assocparams.sasoc_cookie_life =
3195 						assocparams->sasoc_cookie_life;
3196 	}
3197 	return 0;
3198 }
3199 
3200 /*
3201  * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
3202  *
3203  * This socket option is a boolean flag which turns on or off mapped V4
3204  * addresses.  If this option is turned on and the socket is type
3205  * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
3206  * If this option is turned off, then no mapping will be done of V4
3207  * addresses and a user will receive both PF_INET6 and PF_INET type
3208  * addresses on the socket.
3209  */
3210 static int sctp_setsockopt_mappedv4(struct sock *sk, int *val,
3211 				    unsigned int optlen)
3212 {
3213 	struct sctp_sock *sp = sctp_sk(sk);
3214 
3215 	if (optlen < sizeof(int))
3216 		return -EINVAL;
3217 	if (*val)
3218 		sp->v4mapped = 1;
3219 	else
3220 		sp->v4mapped = 0;
3221 
3222 	return 0;
3223 }
3224 
3225 /*
3226  * 8.1.16.  Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
3227  * This option will get or set the maximum size to put in any outgoing
3228  * SCTP DATA chunk.  If a message is larger than this size it will be
3229  * fragmented by SCTP into the specified size.  Note that the underlying
3230  * SCTP implementation may fragment into smaller sized chunks when the
3231  * PMTU of the underlying association is smaller than the value set by
3232  * the user.  The default value for this option is '0' which indicates
3233  * the user is NOT limiting fragmentation and only the PMTU will effect
3234  * SCTP's choice of DATA chunk size.  Note also that values set larger
3235  * than the maximum size of an IP datagram will effectively let SCTP
3236  * control fragmentation (i.e. the same as setting this option to 0).
3237  *
3238  * The following structure is used to access and modify this parameter:
3239  *
3240  * struct sctp_assoc_value {
3241  *   sctp_assoc_t assoc_id;
3242  *   uint32_t assoc_value;
3243  * };
3244  *
3245  * assoc_id:  This parameter is ignored for one-to-one style sockets.
3246  *    For one-to-many style sockets this parameter indicates which
3247  *    association the user is performing an action upon.  Note that if
3248  *    this field's value is zero then the endpoints default value is
3249  *    changed (effecting future associations only).
3250  * assoc_value:  This parameter specifies the maximum size in bytes.
3251  */
3252 static int sctp_setsockopt_maxseg(struct sock *sk,
3253 				  struct sctp_assoc_value *params,
3254 				  unsigned int optlen)
3255 {
3256 	struct sctp_sock *sp = sctp_sk(sk);
3257 	struct sctp_association *asoc;
3258 	sctp_assoc_t assoc_id;
3259 	int val;
3260 
3261 	if (optlen == sizeof(int)) {
3262 		pr_warn_ratelimited(DEPRECATED
3263 				    "%s (pid %d) "
3264 				    "Use of int in maxseg socket option.\n"
3265 				    "Use struct sctp_assoc_value instead\n",
3266 				    current->comm, task_pid_nr(current));
3267 		assoc_id = SCTP_FUTURE_ASSOC;
3268 		val = *(int *)params;
3269 	} else if (optlen == sizeof(struct sctp_assoc_value)) {
3270 		assoc_id = params->assoc_id;
3271 		val = params->assoc_value;
3272 	} else {
3273 		return -EINVAL;
3274 	}
3275 
3276 	asoc = sctp_id2assoc(sk, assoc_id);
3277 	if (!asoc && assoc_id != SCTP_FUTURE_ASSOC &&
3278 	    sctp_style(sk, UDP))
3279 		return -EINVAL;
3280 
3281 	if (val) {
3282 		int min_len, max_len;
3283 		__u16 datasize = asoc ? sctp_datachk_len(&asoc->stream) :
3284 				 sizeof(struct sctp_data_chunk);
3285 
3286 		min_len = sctp_min_frag_point(sp, datasize);
3287 		max_len = SCTP_MAX_CHUNK_LEN - datasize;
3288 
3289 		if (val < min_len || val > max_len)
3290 			return -EINVAL;
3291 	}
3292 
3293 	if (asoc) {
3294 		asoc->user_frag = val;
3295 		sctp_assoc_update_frag_point(asoc);
3296 	} else {
3297 		sp->user_frag = val;
3298 	}
3299 
3300 	return 0;
3301 }
3302 
3303 
3304 /*
3305  *  7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3306  *
3307  *   Requests that the peer mark the enclosed address as the association
3308  *   primary. The enclosed address must be one of the association's
3309  *   locally bound addresses. The following structure is used to make a
3310  *   set primary request:
3311  */
3312 static int sctp_setsockopt_peer_primary_addr(struct sock *sk,
3313 					     struct sctp_setpeerprim *prim,
3314 					     unsigned int optlen)
3315 {
3316 	struct sctp_sock	*sp;
3317 	struct sctp_association	*asoc = NULL;
3318 	struct sctp_chunk	*chunk;
3319 	struct sctp_af		*af;
3320 	int 			err;
3321 
3322 	sp = sctp_sk(sk);
3323 
3324 	if (!sp->ep->asconf_enable)
3325 		return -EPERM;
3326 
3327 	if (optlen != sizeof(struct sctp_setpeerprim))
3328 		return -EINVAL;
3329 
3330 	asoc = sctp_id2assoc(sk, prim->sspp_assoc_id);
3331 	if (!asoc)
3332 		return -EINVAL;
3333 
3334 	if (!asoc->peer.asconf_capable)
3335 		return -EPERM;
3336 
3337 	if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
3338 		return -EPERM;
3339 
3340 	if (!sctp_state(asoc, ESTABLISHED))
3341 		return -ENOTCONN;
3342 
3343 	af = sctp_get_af_specific(prim->sspp_addr.ss_family);
3344 	if (!af)
3345 		return -EINVAL;
3346 
3347 	if (!af->addr_valid((union sctp_addr *)&prim->sspp_addr, sp, NULL))
3348 		return -EADDRNOTAVAIL;
3349 
3350 	if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim->sspp_addr))
3351 		return -EADDRNOTAVAIL;
3352 
3353 	/* Allow security module to validate address. */
3354 	err = security_sctp_bind_connect(sk, SCTP_SET_PEER_PRIMARY_ADDR,
3355 					 (struct sockaddr *)&prim->sspp_addr,
3356 					 af->sockaddr_len);
3357 	if (err)
3358 		return err;
3359 
3360 	/* Create an ASCONF chunk with SET_PRIMARY parameter	*/
3361 	chunk = sctp_make_asconf_set_prim(asoc,
3362 					  (union sctp_addr *)&prim->sspp_addr);
3363 	if (!chunk)
3364 		return -ENOMEM;
3365 
3366 	err = sctp_send_asconf(asoc, chunk);
3367 
3368 	pr_debug("%s: we set peer primary addr primitively\n", __func__);
3369 
3370 	return err;
3371 }
3372 
3373 static int sctp_setsockopt_adaptation_layer(struct sock *sk,
3374 					    struct sctp_setadaptation *adapt,
3375 					    unsigned int optlen)
3376 {
3377 	if (optlen != sizeof(struct sctp_setadaptation))
3378 		return -EINVAL;
3379 
3380 	sctp_sk(sk)->adaptation_ind = adapt->ssb_adaptation_ind;
3381 
3382 	return 0;
3383 }
3384 
3385 /*
3386  * 7.1.29.  Set or Get the default context (SCTP_CONTEXT)
3387  *
3388  * The context field in the sctp_sndrcvinfo structure is normally only
3389  * used when a failed message is retrieved holding the value that was
3390  * sent down on the actual send call.  This option allows the setting of
3391  * a default context on an association basis that will be received on
3392  * reading messages from the peer.  This is especially helpful in the
3393  * one-2-many model for an application to keep some reference to an
3394  * internal state machine that is processing messages on the
3395  * association.  Note that the setting of this value only effects
3396  * received messages from the peer and does not effect the value that is
3397  * saved with outbound messages.
3398  */
3399 static int sctp_setsockopt_context(struct sock *sk,
3400 				   struct sctp_assoc_value *params,
3401 				   unsigned int optlen)
3402 {
3403 	struct sctp_sock *sp = sctp_sk(sk);
3404 	struct sctp_association *asoc;
3405 
3406 	if (optlen != sizeof(struct sctp_assoc_value))
3407 		return -EINVAL;
3408 
3409 	asoc = sctp_id2assoc(sk, params->assoc_id);
3410 	if (!asoc && params->assoc_id > SCTP_ALL_ASSOC &&
3411 	    sctp_style(sk, UDP))
3412 		return -EINVAL;
3413 
3414 	if (asoc) {
3415 		asoc->default_rcv_context = params->assoc_value;
3416 
3417 		return 0;
3418 	}
3419 
3420 	if (sctp_style(sk, TCP))
3421 		params->assoc_id = SCTP_FUTURE_ASSOC;
3422 
3423 	if (params->assoc_id == SCTP_FUTURE_ASSOC ||
3424 	    params->assoc_id == SCTP_ALL_ASSOC)
3425 		sp->default_rcv_context = params->assoc_value;
3426 
3427 	if (params->assoc_id == SCTP_CURRENT_ASSOC ||
3428 	    params->assoc_id == SCTP_ALL_ASSOC)
3429 		list_for_each_entry(asoc, &sp->ep->asocs, asocs)
3430 			asoc->default_rcv_context = params->assoc_value;
3431 
3432 	return 0;
3433 }
3434 
3435 /*
3436  * 7.1.24.  Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3437  *
3438  * This options will at a minimum specify if the implementation is doing
3439  * fragmented interleave.  Fragmented interleave, for a one to many
3440  * socket, is when subsequent calls to receive a message may return
3441  * parts of messages from different associations.  Some implementations
3442  * may allow you to turn this value on or off.  If so, when turned off,
3443  * no fragment interleave will occur (which will cause a head of line
3444  * blocking amongst multiple associations sharing the same one to many
3445  * socket).  When this option is turned on, then each receive call may
3446  * come from a different association (thus the user must receive data
3447  * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3448  * association each receive belongs to.
3449  *
3450  * This option takes a boolean value.  A non-zero value indicates that
3451  * fragmented interleave is on.  A value of zero indicates that
3452  * fragmented interleave is off.
3453  *
3454  * Note that it is important that an implementation that allows this
3455  * option to be turned on, have it off by default.  Otherwise an unaware
3456  * application using the one to many model may become confused and act
3457  * incorrectly.
3458  */
3459 static int sctp_setsockopt_fragment_interleave(struct sock *sk, int *val,
3460 					       unsigned int optlen)
3461 {
3462 	if (optlen != sizeof(int))
3463 		return -EINVAL;
3464 
3465 	sctp_sk(sk)->frag_interleave = !!*val;
3466 
3467 	if (!sctp_sk(sk)->frag_interleave)
3468 		sctp_sk(sk)->ep->intl_enable = 0;
3469 
3470 	return 0;
3471 }
3472 
3473 /*
3474  * 8.1.21.  Set or Get the SCTP Partial Delivery Point
3475  *       (SCTP_PARTIAL_DELIVERY_POINT)
3476  *
3477  * This option will set or get the SCTP partial delivery point.  This
3478  * point is the size of a message where the partial delivery API will be
3479  * invoked to help free up rwnd space for the peer.  Setting this to a
3480  * lower value will cause partial deliveries to happen more often.  The
3481  * calls argument is an integer that sets or gets the partial delivery
3482  * point.  Note also that the call will fail if the user attempts to set
3483  * this value larger than the socket receive buffer size.
3484  *
3485  * Note that any single message having a length smaller than or equal to
3486  * the SCTP partial delivery point will be delivered in one single read
3487  * call as long as the user provided buffer is large enough to hold the
3488  * message.
3489  */
3490 static int sctp_setsockopt_partial_delivery_point(struct sock *sk, u32 *val,
3491 						  unsigned int optlen)
3492 {
3493 	if (optlen != sizeof(u32))
3494 		return -EINVAL;
3495 
3496 	/* Note: We double the receive buffer from what the user sets
3497 	 * it to be, also initial rwnd is based on rcvbuf/2.
3498 	 */
3499 	if (*val > (sk->sk_rcvbuf >> 1))
3500 		return -EINVAL;
3501 
3502 	sctp_sk(sk)->pd_point = *val;
3503 
3504 	return 0; /* is this the right error code? */
3505 }
3506 
3507 /*
3508  * 7.1.28.  Set or Get the maximum burst (SCTP_MAX_BURST)
3509  *
3510  * This option will allow a user to change the maximum burst of packets
3511  * that can be emitted by this association.  Note that the default value
3512  * is 4, and some implementations may restrict this setting so that it
3513  * can only be lowered.
3514  *
3515  * NOTE: This text doesn't seem right.  Do this on a socket basis with
3516  * future associations inheriting the socket value.
3517  */
3518 static int sctp_setsockopt_maxburst(struct sock *sk,
3519 				    struct sctp_assoc_value *params,
3520 				    unsigned int optlen)
3521 {
3522 	struct sctp_sock *sp = sctp_sk(sk);
3523 	struct sctp_association *asoc;
3524 	sctp_assoc_t assoc_id;
3525 	u32 assoc_value;
3526 
3527 	if (optlen == sizeof(int)) {
3528 		pr_warn_ratelimited(DEPRECATED
3529 				    "%s (pid %d) "
3530 				    "Use of int in max_burst socket option deprecated.\n"
3531 				    "Use struct sctp_assoc_value instead\n",
3532 				    current->comm, task_pid_nr(current));
3533 		assoc_id = SCTP_FUTURE_ASSOC;
3534 		assoc_value = *((int *)params);
3535 	} else if (optlen == sizeof(struct sctp_assoc_value)) {
3536 		assoc_id = params->assoc_id;
3537 		assoc_value = params->assoc_value;
3538 	} else
3539 		return -EINVAL;
3540 
3541 	asoc = sctp_id2assoc(sk, assoc_id);
3542 	if (!asoc && assoc_id > SCTP_ALL_ASSOC && sctp_style(sk, UDP))
3543 		return -EINVAL;
3544 
3545 	if (asoc) {
3546 		asoc->max_burst = assoc_value;
3547 
3548 		return 0;
3549 	}
3550 
3551 	if (sctp_style(sk, TCP))
3552 		assoc_id = SCTP_FUTURE_ASSOC;
3553 
3554 	if (assoc_id == SCTP_FUTURE_ASSOC || assoc_id == SCTP_ALL_ASSOC)
3555 		sp->max_burst = assoc_value;
3556 
3557 	if (assoc_id == SCTP_CURRENT_ASSOC || assoc_id == SCTP_ALL_ASSOC)
3558 		list_for_each_entry(asoc, &sp->ep->asocs, asocs)
3559 			asoc->max_burst = assoc_value;
3560 
3561 	return 0;
3562 }
3563 
3564 /*
3565  * 7.1.18.  Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3566  *
3567  * This set option adds a chunk type that the user is requesting to be
3568  * received only in an authenticated way.  Changes to the list of chunks
3569  * will only effect future associations on the socket.
3570  */
3571 static int sctp_setsockopt_auth_chunk(struct sock *sk,
3572 				      struct sctp_authchunk *val,
3573 				      unsigned int optlen)
3574 {
3575 	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3576 
3577 	if (!ep->auth_enable)
3578 		return -EACCES;
3579 
3580 	if (optlen != sizeof(struct sctp_authchunk))
3581 		return -EINVAL;
3582 
3583 	switch (val->sauth_chunk) {
3584 	case SCTP_CID_INIT:
3585 	case SCTP_CID_INIT_ACK:
3586 	case SCTP_CID_SHUTDOWN_COMPLETE:
3587 	case SCTP_CID_AUTH:
3588 		return -EINVAL;
3589 	}
3590 
3591 	/* add this chunk id to the endpoint */
3592 	return sctp_auth_ep_add_chunkid(ep, val->sauth_chunk);
3593 }
3594 
3595 /*
3596  * 7.1.19.  Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3597  *
3598  * This option gets or sets the list of HMAC algorithms that the local
3599  * endpoint requires the peer to use.
3600  */
3601 static int sctp_setsockopt_hmac_ident(struct sock *sk,
3602 				      struct sctp_hmacalgo *hmacs,
3603 				      unsigned int optlen)
3604 {
3605 	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3606 	u32 idents;
3607 
3608 	if (!ep->auth_enable)
3609 		return -EACCES;
3610 
3611 	if (optlen < sizeof(struct sctp_hmacalgo))
3612 		return -EINVAL;
3613 	optlen = min_t(unsigned int, optlen, sizeof(struct sctp_hmacalgo) +
3614 					     SCTP_AUTH_NUM_HMACS * sizeof(u16));
3615 
3616 	idents = hmacs->shmac_num_idents;
3617 	if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3618 	    (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo)))
3619 		return -EINVAL;
3620 
3621 	return sctp_auth_ep_set_hmacs(ep, hmacs);
3622 }
3623 
3624 /*
3625  * 7.1.20.  Set a shared key (SCTP_AUTH_KEY)
3626  *
3627  * This option will set a shared secret key which is used to build an
3628  * association shared key.
3629  */
3630 static int sctp_setsockopt_auth_key(struct sock *sk,
3631 				    struct sctp_authkey *authkey,
3632 				    unsigned int optlen)
3633 {
3634 	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3635 	struct sctp_association *asoc;
3636 	int ret = -EINVAL;
3637 
3638 	if (optlen <= sizeof(struct sctp_authkey))
3639 		return -EINVAL;
3640 	/* authkey->sca_keylength is u16, so optlen can't be bigger than
3641 	 * this.
3642 	 */
3643 	optlen = min_t(unsigned int, optlen, USHRT_MAX + sizeof(*authkey));
3644 
3645 	if (authkey->sca_keylength > optlen - sizeof(*authkey))
3646 		goto out;
3647 
3648 	asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
3649 	if (!asoc && authkey->sca_assoc_id > SCTP_ALL_ASSOC &&
3650 	    sctp_style(sk, UDP))
3651 		goto out;
3652 
3653 	if (asoc) {
3654 		ret = sctp_auth_set_key(ep, asoc, authkey);
3655 		goto out;
3656 	}
3657 
3658 	if (sctp_style(sk, TCP))
3659 		authkey->sca_assoc_id = SCTP_FUTURE_ASSOC;
3660 
3661 	if (authkey->sca_assoc_id == SCTP_FUTURE_ASSOC ||
3662 	    authkey->sca_assoc_id == SCTP_ALL_ASSOC) {
3663 		ret = sctp_auth_set_key(ep, asoc, authkey);
3664 		if (ret)
3665 			goto out;
3666 	}
3667 
3668 	ret = 0;
3669 
3670 	if (authkey->sca_assoc_id == SCTP_CURRENT_ASSOC ||
3671 	    authkey->sca_assoc_id == SCTP_ALL_ASSOC) {
3672 		list_for_each_entry(asoc, &ep->asocs, asocs) {
3673 			int res = sctp_auth_set_key(ep, asoc, authkey);
3674 
3675 			if (res && !ret)
3676 				ret = res;
3677 		}
3678 	}
3679 
3680 out:
3681 	memzero_explicit(authkey, optlen);
3682 	return ret;
3683 }
3684 
3685 /*
3686  * 7.1.21.  Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3687  *
3688  * This option will get or set the active shared key to be used to build
3689  * the association shared key.
3690  */
3691 static int sctp_setsockopt_active_key(struct sock *sk,
3692 				      struct sctp_authkeyid *val,
3693 				      unsigned int optlen)
3694 {
3695 	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3696 	struct sctp_association *asoc;
3697 	int ret = 0;
3698 
3699 	if (optlen != sizeof(struct sctp_authkeyid))
3700 		return -EINVAL;
3701 
3702 	asoc = sctp_id2assoc(sk, val->scact_assoc_id);
3703 	if (!asoc && val->scact_assoc_id > SCTP_ALL_ASSOC &&
3704 	    sctp_style(sk, UDP))
3705 		return -EINVAL;
3706 
3707 	if (asoc)
3708 		return sctp_auth_set_active_key(ep, asoc, val->scact_keynumber);
3709 
3710 	if (sctp_style(sk, TCP))
3711 		val->scact_assoc_id = SCTP_FUTURE_ASSOC;
3712 
3713 	if (val->scact_assoc_id == SCTP_FUTURE_ASSOC ||
3714 	    val->scact_assoc_id == SCTP_ALL_ASSOC) {
3715 		ret = sctp_auth_set_active_key(ep, asoc, val->scact_keynumber);
3716 		if (ret)
3717 			return ret;
3718 	}
3719 
3720 	if (val->scact_assoc_id == SCTP_CURRENT_ASSOC ||
3721 	    val->scact_assoc_id == SCTP_ALL_ASSOC) {
3722 		list_for_each_entry(asoc, &ep->asocs, asocs) {
3723 			int res = sctp_auth_set_active_key(ep, asoc,
3724 							   val->scact_keynumber);
3725 
3726 			if (res && !ret)
3727 				ret = res;
3728 		}
3729 	}
3730 
3731 	return ret;
3732 }
3733 
3734 /*
3735  * 7.1.22.  Delete a shared key (SCTP_AUTH_DELETE_KEY)
3736  *
3737  * This set option will delete a shared secret key from use.
3738  */
3739 static int sctp_setsockopt_del_key(struct sock *sk,
3740 				   struct sctp_authkeyid *val,
3741 				   unsigned int optlen)
3742 {
3743 	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3744 	struct sctp_association *asoc;
3745 	int ret = 0;
3746 
3747 	if (optlen != sizeof(struct sctp_authkeyid))
3748 		return -EINVAL;
3749 
3750 	asoc = sctp_id2assoc(sk, val->scact_assoc_id);
3751 	if (!asoc && val->scact_assoc_id > SCTP_ALL_ASSOC &&
3752 	    sctp_style(sk, UDP))
3753 		return -EINVAL;
3754 
3755 	if (asoc)
3756 		return sctp_auth_del_key_id(ep, asoc, val->scact_keynumber);
3757 
3758 	if (sctp_style(sk, TCP))
3759 		val->scact_assoc_id = SCTP_FUTURE_ASSOC;
3760 
3761 	if (val->scact_assoc_id == SCTP_FUTURE_ASSOC ||
3762 	    val->scact_assoc_id == SCTP_ALL_ASSOC) {
3763 		ret = sctp_auth_del_key_id(ep, asoc, val->scact_keynumber);
3764 		if (ret)
3765 			return ret;
3766 	}
3767 
3768 	if (val->scact_assoc_id == SCTP_CURRENT_ASSOC ||
3769 	    val->scact_assoc_id == SCTP_ALL_ASSOC) {
3770 		list_for_each_entry(asoc, &ep->asocs, asocs) {
3771 			int res = sctp_auth_del_key_id(ep, asoc,
3772 						       val->scact_keynumber);
3773 
3774 			if (res && !ret)
3775 				ret = res;
3776 		}
3777 	}
3778 
3779 	return ret;
3780 }
3781 
3782 /*
3783  * 8.3.4  Deactivate a Shared Key (SCTP_AUTH_DEACTIVATE_KEY)
3784  *
3785  * This set option will deactivate a shared secret key.
3786  */
3787 static int sctp_setsockopt_deactivate_key(struct sock *sk,
3788 					  struct sctp_authkeyid *val,
3789 					  unsigned int optlen)
3790 {
3791 	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3792 	struct sctp_association *asoc;
3793 	int ret = 0;
3794 
3795 	if (optlen != sizeof(struct sctp_authkeyid))
3796 		return -EINVAL;
3797 
3798 	asoc = sctp_id2assoc(sk, val->scact_assoc_id);
3799 	if (!asoc && val->scact_assoc_id > SCTP_ALL_ASSOC &&
3800 	    sctp_style(sk, UDP))
3801 		return -EINVAL;
3802 
3803 	if (asoc)
3804 		return sctp_auth_deact_key_id(ep, asoc, val->scact_keynumber);
3805 
3806 	if (sctp_style(sk, TCP))
3807 		val->scact_assoc_id = SCTP_FUTURE_ASSOC;
3808 
3809 	if (val->scact_assoc_id == SCTP_FUTURE_ASSOC ||
3810 	    val->scact_assoc_id == SCTP_ALL_ASSOC) {
3811 		ret = sctp_auth_deact_key_id(ep, asoc, val->scact_keynumber);
3812 		if (ret)
3813 			return ret;
3814 	}
3815 
3816 	if (val->scact_assoc_id == SCTP_CURRENT_ASSOC ||
3817 	    val->scact_assoc_id == SCTP_ALL_ASSOC) {
3818 		list_for_each_entry(asoc, &ep->asocs, asocs) {
3819 			int res = sctp_auth_deact_key_id(ep, asoc,
3820 							 val->scact_keynumber);
3821 
3822 			if (res && !ret)
3823 				ret = res;
3824 		}
3825 	}
3826 
3827 	return ret;
3828 }
3829 
3830 /*
3831  * 8.1.23 SCTP_AUTO_ASCONF
3832  *
3833  * This option will enable or disable the use of the automatic generation of
3834  * ASCONF chunks to add and delete addresses to an existing association.  Note
3835  * that this option has two caveats namely: a) it only affects sockets that
3836  * are bound to all addresses available to the SCTP stack, and b) the system
3837  * administrator may have an overriding control that turns the ASCONF feature
3838  * off no matter what setting the socket option may have.
3839  * This option expects an integer boolean flag, where a non-zero value turns on
3840  * the option, and a zero value turns off the option.
3841  * Note. In this implementation, socket operation overrides default parameter
3842  * being set by sysctl as well as FreeBSD implementation
3843  */
3844 static int sctp_setsockopt_auto_asconf(struct sock *sk, int *val,
3845 					unsigned int optlen)
3846 {
3847 	struct sctp_sock *sp = sctp_sk(sk);
3848 
3849 	if (optlen < sizeof(int))
3850 		return -EINVAL;
3851 	if (!sctp_is_ep_boundall(sk) && *val)
3852 		return -EINVAL;
3853 	if ((*val && sp->do_auto_asconf) || (!*val && !sp->do_auto_asconf))
3854 		return 0;
3855 
3856 	spin_lock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3857 	if (*val == 0 && sp->do_auto_asconf) {
3858 		list_del(&sp->auto_asconf_list);
3859 		sp->do_auto_asconf = 0;
3860 	} else if (*val && !sp->do_auto_asconf) {
3861 		list_add_tail(&sp->auto_asconf_list,
3862 		    &sock_net(sk)->sctp.auto_asconf_splist);
3863 		sp->do_auto_asconf = 1;
3864 	}
3865 	spin_unlock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3866 	return 0;
3867 }
3868 
3869 /*
3870  * SCTP_PEER_ADDR_THLDS
3871  *
3872  * This option allows us to alter the partially failed threshold for one or all
3873  * transports in an association.  See Section 6.1 of:
3874  * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
3875  */
3876 static int sctp_setsockopt_paddr_thresholds(struct sock *sk,
3877 					    struct sctp_paddrthlds_v2 *val,
3878 					    unsigned int optlen, bool v2)
3879 {
3880 	struct sctp_transport *trans;
3881 	struct sctp_association *asoc;
3882 	int len;
3883 
3884 	len = v2 ? sizeof(*val) : sizeof(struct sctp_paddrthlds);
3885 	if (optlen < len)
3886 		return -EINVAL;
3887 
3888 	if (v2 && val->spt_pathpfthld > val->spt_pathcpthld)
3889 		return -EINVAL;
3890 
3891 	if (!sctp_is_any(sk, (const union sctp_addr *)&val->spt_address)) {
3892 		trans = sctp_addr_id2transport(sk, &val->spt_address,
3893 					       val->spt_assoc_id);
3894 		if (!trans)
3895 			return -ENOENT;
3896 
3897 		if (val->spt_pathmaxrxt)
3898 			trans->pathmaxrxt = val->spt_pathmaxrxt;
3899 		if (v2)
3900 			trans->ps_retrans = val->spt_pathcpthld;
3901 		trans->pf_retrans = val->spt_pathpfthld;
3902 
3903 		return 0;
3904 	}
3905 
3906 	asoc = sctp_id2assoc(sk, val->spt_assoc_id);
3907 	if (!asoc && val->spt_assoc_id != SCTP_FUTURE_ASSOC &&
3908 	    sctp_style(sk, UDP))
3909 		return -EINVAL;
3910 
3911 	if (asoc) {
3912 		list_for_each_entry(trans, &asoc->peer.transport_addr_list,
3913 				    transports) {
3914 			if (val->spt_pathmaxrxt)
3915 				trans->pathmaxrxt = val->spt_pathmaxrxt;
3916 			if (v2)
3917 				trans->ps_retrans = val->spt_pathcpthld;
3918 			trans->pf_retrans = val->spt_pathpfthld;
3919 		}
3920 
3921 		if (val->spt_pathmaxrxt)
3922 			asoc->pathmaxrxt = val->spt_pathmaxrxt;
3923 		if (v2)
3924 			asoc->ps_retrans = val->spt_pathcpthld;
3925 		asoc->pf_retrans = val->spt_pathpfthld;
3926 	} else {
3927 		struct sctp_sock *sp = sctp_sk(sk);
3928 
3929 		if (val->spt_pathmaxrxt)
3930 			sp->pathmaxrxt = val->spt_pathmaxrxt;
3931 		if (v2)
3932 			sp->ps_retrans = val->spt_pathcpthld;
3933 		sp->pf_retrans = val->spt_pathpfthld;
3934 	}
3935 
3936 	return 0;
3937 }
3938 
3939 static int sctp_setsockopt_recvrcvinfo(struct sock *sk, int *val,
3940 				       unsigned int optlen)
3941 {
3942 	if (optlen < sizeof(int))
3943 		return -EINVAL;
3944 
3945 	sctp_sk(sk)->recvrcvinfo = (*val == 0) ? 0 : 1;
3946 
3947 	return 0;
3948 }
3949 
3950 static int sctp_setsockopt_recvnxtinfo(struct sock *sk, int *val,
3951 				       unsigned int optlen)
3952 {
3953 	if (optlen < sizeof(int))
3954 		return -EINVAL;
3955 
3956 	sctp_sk(sk)->recvnxtinfo = (*val == 0) ? 0 : 1;
3957 
3958 	return 0;
3959 }
3960 
3961 static int sctp_setsockopt_pr_supported(struct sock *sk,
3962 					struct sctp_assoc_value *params,
3963 					unsigned int optlen)
3964 {
3965 	struct sctp_association *asoc;
3966 
3967 	if (optlen != sizeof(*params))
3968 		return -EINVAL;
3969 
3970 	asoc = sctp_id2assoc(sk, params->assoc_id);
3971 	if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
3972 	    sctp_style(sk, UDP))
3973 		return -EINVAL;
3974 
3975 	sctp_sk(sk)->ep->prsctp_enable = !!params->assoc_value;
3976 
3977 	return 0;
3978 }
3979 
3980 static int sctp_setsockopt_default_prinfo(struct sock *sk,
3981 					  struct sctp_default_prinfo *info,
3982 					  unsigned int optlen)
3983 {
3984 	struct sctp_sock *sp = sctp_sk(sk);
3985 	struct sctp_association *asoc;
3986 	int retval = -EINVAL;
3987 
3988 	if (optlen != sizeof(*info))
3989 		goto out;
3990 
3991 	if (info->pr_policy & ~SCTP_PR_SCTP_MASK)
3992 		goto out;
3993 
3994 	if (info->pr_policy == SCTP_PR_SCTP_NONE)
3995 		info->pr_value = 0;
3996 
3997 	asoc = sctp_id2assoc(sk, info->pr_assoc_id);
3998 	if (!asoc && info->pr_assoc_id > SCTP_ALL_ASSOC &&
3999 	    sctp_style(sk, UDP))
4000 		goto out;
4001 
4002 	retval = 0;
4003 
4004 	if (asoc) {
4005 		SCTP_PR_SET_POLICY(asoc->default_flags, info->pr_policy);
4006 		asoc->default_timetolive = info->pr_value;
4007 		goto out;
4008 	}
4009 
4010 	if (sctp_style(sk, TCP))
4011 		info->pr_assoc_id = SCTP_FUTURE_ASSOC;
4012 
4013 	if (info->pr_assoc_id == SCTP_FUTURE_ASSOC ||
4014 	    info->pr_assoc_id == SCTP_ALL_ASSOC) {
4015 		SCTP_PR_SET_POLICY(sp->default_flags, info->pr_policy);
4016 		sp->default_timetolive = info->pr_value;
4017 	}
4018 
4019 	if (info->pr_assoc_id == SCTP_CURRENT_ASSOC ||
4020 	    info->pr_assoc_id == SCTP_ALL_ASSOC) {
4021 		list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4022 			SCTP_PR_SET_POLICY(asoc->default_flags,
4023 					   info->pr_policy);
4024 			asoc->default_timetolive = info->pr_value;
4025 		}
4026 	}
4027 
4028 out:
4029 	return retval;
4030 }
4031 
4032 static int sctp_setsockopt_reconfig_supported(struct sock *sk,
4033 					      struct sctp_assoc_value *params,
4034 					      unsigned int optlen)
4035 {
4036 	struct sctp_association *asoc;
4037 	int retval = -EINVAL;
4038 
4039 	if (optlen != sizeof(*params))
4040 		goto out;
4041 
4042 	asoc = sctp_id2assoc(sk, params->assoc_id);
4043 	if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4044 	    sctp_style(sk, UDP))
4045 		goto out;
4046 
4047 	sctp_sk(sk)->ep->reconf_enable = !!params->assoc_value;
4048 
4049 	retval = 0;
4050 
4051 out:
4052 	return retval;
4053 }
4054 
4055 static int sctp_setsockopt_enable_strreset(struct sock *sk,
4056 					   struct sctp_assoc_value *params,
4057 					   unsigned int optlen)
4058 {
4059 	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
4060 	struct sctp_association *asoc;
4061 	int retval = -EINVAL;
4062 
4063 	if (optlen != sizeof(*params))
4064 		goto out;
4065 
4066 	if (params->assoc_value & (~SCTP_ENABLE_STRRESET_MASK))
4067 		goto out;
4068 
4069 	asoc = sctp_id2assoc(sk, params->assoc_id);
4070 	if (!asoc && params->assoc_id > SCTP_ALL_ASSOC &&
4071 	    sctp_style(sk, UDP))
4072 		goto out;
4073 
4074 	retval = 0;
4075 
4076 	if (asoc) {
4077 		asoc->strreset_enable = params->assoc_value;
4078 		goto out;
4079 	}
4080 
4081 	if (sctp_style(sk, TCP))
4082 		params->assoc_id = SCTP_FUTURE_ASSOC;
4083 
4084 	if (params->assoc_id == SCTP_FUTURE_ASSOC ||
4085 	    params->assoc_id == SCTP_ALL_ASSOC)
4086 		ep->strreset_enable = params->assoc_value;
4087 
4088 	if (params->assoc_id == SCTP_CURRENT_ASSOC ||
4089 	    params->assoc_id == SCTP_ALL_ASSOC)
4090 		list_for_each_entry(asoc, &ep->asocs, asocs)
4091 			asoc->strreset_enable = params->assoc_value;
4092 
4093 out:
4094 	return retval;
4095 }
4096 
4097 static int sctp_setsockopt_reset_streams(struct sock *sk,
4098 					 struct sctp_reset_streams *params,
4099 					 unsigned int optlen)
4100 {
4101 	struct sctp_association *asoc;
4102 
4103 	if (optlen < sizeof(*params))
4104 		return -EINVAL;
4105 	/* srs_number_streams is u16, so optlen can't be bigger than this. */
4106 	optlen = min_t(unsigned int, optlen, USHRT_MAX +
4107 					     sizeof(__u16) * sizeof(*params));
4108 
4109 	if (params->srs_number_streams * sizeof(__u16) >
4110 	    optlen - sizeof(*params))
4111 		return -EINVAL;
4112 
4113 	asoc = sctp_id2assoc(sk, params->srs_assoc_id);
4114 	if (!asoc)
4115 		return -EINVAL;
4116 
4117 	return sctp_send_reset_streams(asoc, params);
4118 }
4119 
4120 static int sctp_setsockopt_reset_assoc(struct sock *sk, sctp_assoc_t *associd,
4121 				       unsigned int optlen)
4122 {
4123 	struct sctp_association *asoc;
4124 
4125 	if (optlen != sizeof(*associd))
4126 		return -EINVAL;
4127 
4128 	asoc = sctp_id2assoc(sk, *associd);
4129 	if (!asoc)
4130 		return -EINVAL;
4131 
4132 	return sctp_send_reset_assoc(asoc);
4133 }
4134 
4135 static int sctp_setsockopt_add_streams(struct sock *sk,
4136 				       struct sctp_add_streams *params,
4137 				       unsigned int optlen)
4138 {
4139 	struct sctp_association *asoc;
4140 
4141 	if (optlen != sizeof(*params))
4142 		return -EINVAL;
4143 
4144 	asoc = sctp_id2assoc(sk, params->sas_assoc_id);
4145 	if (!asoc)
4146 		return -EINVAL;
4147 
4148 	return sctp_send_add_streams(asoc, params);
4149 }
4150 
4151 static int sctp_setsockopt_scheduler(struct sock *sk,
4152 				     struct sctp_assoc_value *params,
4153 				     unsigned int optlen)
4154 {
4155 	struct sctp_sock *sp = sctp_sk(sk);
4156 	struct sctp_association *asoc;
4157 	int retval = 0;
4158 
4159 	if (optlen < sizeof(*params))
4160 		return -EINVAL;
4161 
4162 	if (params->assoc_value > SCTP_SS_MAX)
4163 		return -EINVAL;
4164 
4165 	asoc = sctp_id2assoc(sk, params->assoc_id);
4166 	if (!asoc && params->assoc_id > SCTP_ALL_ASSOC &&
4167 	    sctp_style(sk, UDP))
4168 		return -EINVAL;
4169 
4170 	if (asoc)
4171 		return sctp_sched_set_sched(asoc, params->assoc_value);
4172 
4173 	if (sctp_style(sk, TCP))
4174 		params->assoc_id = SCTP_FUTURE_ASSOC;
4175 
4176 	if (params->assoc_id == SCTP_FUTURE_ASSOC ||
4177 	    params->assoc_id == SCTP_ALL_ASSOC)
4178 		sp->default_ss = params->assoc_value;
4179 
4180 	if (params->assoc_id == SCTP_CURRENT_ASSOC ||
4181 	    params->assoc_id == SCTP_ALL_ASSOC) {
4182 		list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4183 			int ret = sctp_sched_set_sched(asoc,
4184 						       params->assoc_value);
4185 
4186 			if (ret && !retval)
4187 				retval = ret;
4188 		}
4189 	}
4190 
4191 	return retval;
4192 }
4193 
4194 static int sctp_setsockopt_scheduler_value(struct sock *sk,
4195 					   struct sctp_stream_value *params,
4196 					   unsigned int optlen)
4197 {
4198 	struct sctp_association *asoc;
4199 	int retval = -EINVAL;
4200 
4201 	if (optlen < sizeof(*params))
4202 		goto out;
4203 
4204 	asoc = sctp_id2assoc(sk, params->assoc_id);
4205 	if (!asoc && params->assoc_id != SCTP_CURRENT_ASSOC &&
4206 	    sctp_style(sk, UDP))
4207 		goto out;
4208 
4209 	if (asoc) {
4210 		retval = sctp_sched_set_value(asoc, params->stream_id,
4211 					      params->stream_value, GFP_KERNEL);
4212 		goto out;
4213 	}
4214 
4215 	retval = 0;
4216 
4217 	list_for_each_entry(asoc, &sctp_sk(sk)->ep->asocs, asocs) {
4218 		int ret = sctp_sched_set_value(asoc, params->stream_id,
4219 					       params->stream_value,
4220 					       GFP_KERNEL);
4221 		if (ret && !retval) /* try to return the 1st error. */
4222 			retval = ret;
4223 	}
4224 
4225 out:
4226 	return retval;
4227 }
4228 
4229 static int sctp_setsockopt_interleaving_supported(struct sock *sk,
4230 						  struct sctp_assoc_value *p,
4231 						  unsigned int optlen)
4232 {
4233 	struct sctp_sock *sp = sctp_sk(sk);
4234 	struct sctp_association *asoc;
4235 
4236 	if (optlen < sizeof(*p))
4237 		return -EINVAL;
4238 
4239 	asoc = sctp_id2assoc(sk, p->assoc_id);
4240 	if (!asoc && p->assoc_id != SCTP_FUTURE_ASSOC && sctp_style(sk, UDP))
4241 		return -EINVAL;
4242 
4243 	if (!sock_net(sk)->sctp.intl_enable || !sp->frag_interleave) {
4244 		return -EPERM;
4245 	}
4246 
4247 	sp->ep->intl_enable = !!p->assoc_value;
4248 	return 0;
4249 }
4250 
4251 static int sctp_setsockopt_reuse_port(struct sock *sk, int *val,
4252 				      unsigned int optlen)
4253 {
4254 	if (!sctp_style(sk, TCP))
4255 		return -EOPNOTSUPP;
4256 
4257 	if (sctp_sk(sk)->ep->base.bind_addr.port)
4258 		return -EFAULT;
4259 
4260 	if (optlen < sizeof(int))
4261 		return -EINVAL;
4262 
4263 	sctp_sk(sk)->reuse = !!*val;
4264 
4265 	return 0;
4266 }
4267 
4268 static int sctp_assoc_ulpevent_type_set(struct sctp_event *param,
4269 					struct sctp_association *asoc)
4270 {
4271 	struct sctp_ulpevent *event;
4272 
4273 	sctp_ulpevent_type_set(&asoc->subscribe, param->se_type, param->se_on);
4274 
4275 	if (param->se_type == SCTP_SENDER_DRY_EVENT && param->se_on) {
4276 		if (sctp_outq_is_empty(&asoc->outqueue)) {
4277 			event = sctp_ulpevent_make_sender_dry_event(asoc,
4278 					GFP_USER | __GFP_NOWARN);
4279 			if (!event)
4280 				return -ENOMEM;
4281 
4282 			asoc->stream.si->enqueue_event(&asoc->ulpq, event);
4283 		}
4284 	}
4285 
4286 	return 0;
4287 }
4288 
4289 static int sctp_setsockopt_event(struct sock *sk, struct sctp_event *param,
4290 				 unsigned int optlen)
4291 {
4292 	struct sctp_sock *sp = sctp_sk(sk);
4293 	struct sctp_association *asoc;
4294 	int retval = 0;
4295 
4296 	if (optlen < sizeof(*param))
4297 		return -EINVAL;
4298 
4299 	if (param->se_type < SCTP_SN_TYPE_BASE ||
4300 	    param->se_type > SCTP_SN_TYPE_MAX)
4301 		return -EINVAL;
4302 
4303 	asoc = sctp_id2assoc(sk, param->se_assoc_id);
4304 	if (!asoc && param->se_assoc_id > SCTP_ALL_ASSOC &&
4305 	    sctp_style(sk, UDP))
4306 		return -EINVAL;
4307 
4308 	if (asoc)
4309 		return sctp_assoc_ulpevent_type_set(param, asoc);
4310 
4311 	if (sctp_style(sk, TCP))
4312 		param->se_assoc_id = SCTP_FUTURE_ASSOC;
4313 
4314 	if (param->se_assoc_id == SCTP_FUTURE_ASSOC ||
4315 	    param->se_assoc_id == SCTP_ALL_ASSOC)
4316 		sctp_ulpevent_type_set(&sp->subscribe,
4317 				       param->se_type, param->se_on);
4318 
4319 	if (param->se_assoc_id == SCTP_CURRENT_ASSOC ||
4320 	    param->se_assoc_id == SCTP_ALL_ASSOC) {
4321 		list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4322 			int ret = sctp_assoc_ulpevent_type_set(param, asoc);
4323 
4324 			if (ret && !retval)
4325 				retval = ret;
4326 		}
4327 	}
4328 
4329 	return retval;
4330 }
4331 
4332 static int sctp_setsockopt_asconf_supported(struct sock *sk,
4333 					    struct sctp_assoc_value *params,
4334 					    unsigned int optlen)
4335 {
4336 	struct sctp_association *asoc;
4337 	struct sctp_endpoint *ep;
4338 	int retval = -EINVAL;
4339 
4340 	if (optlen != sizeof(*params))
4341 		goto out;
4342 
4343 	asoc = sctp_id2assoc(sk, params->assoc_id);
4344 	if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4345 	    sctp_style(sk, UDP))
4346 		goto out;
4347 
4348 	ep = sctp_sk(sk)->ep;
4349 	ep->asconf_enable = !!params->assoc_value;
4350 
4351 	if (ep->asconf_enable && ep->auth_enable) {
4352 		sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF);
4353 		sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF_ACK);
4354 	}
4355 
4356 	retval = 0;
4357 
4358 out:
4359 	return retval;
4360 }
4361 
4362 static int sctp_setsockopt_auth_supported(struct sock *sk,
4363 					  struct sctp_assoc_value *params,
4364 					  unsigned int optlen)
4365 {
4366 	struct sctp_association *asoc;
4367 	struct sctp_endpoint *ep;
4368 	int retval = -EINVAL;
4369 
4370 	if (optlen != sizeof(*params))
4371 		goto out;
4372 
4373 	asoc = sctp_id2assoc(sk, params->assoc_id);
4374 	if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4375 	    sctp_style(sk, UDP))
4376 		goto out;
4377 
4378 	ep = sctp_sk(sk)->ep;
4379 	if (params->assoc_value) {
4380 		retval = sctp_auth_init(ep, GFP_KERNEL);
4381 		if (retval)
4382 			goto out;
4383 		if (ep->asconf_enable) {
4384 			sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF);
4385 			sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF_ACK);
4386 		}
4387 	}
4388 
4389 	ep->auth_enable = !!params->assoc_value;
4390 	retval = 0;
4391 
4392 out:
4393 	return retval;
4394 }
4395 
4396 static int sctp_setsockopt_ecn_supported(struct sock *sk,
4397 					 struct sctp_assoc_value *params,
4398 					 unsigned int optlen)
4399 {
4400 	struct sctp_association *asoc;
4401 	int retval = -EINVAL;
4402 
4403 	if (optlen != sizeof(*params))
4404 		goto out;
4405 
4406 	asoc = sctp_id2assoc(sk, params->assoc_id);
4407 	if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4408 	    sctp_style(sk, UDP))
4409 		goto out;
4410 
4411 	sctp_sk(sk)->ep->ecn_enable = !!params->assoc_value;
4412 	retval = 0;
4413 
4414 out:
4415 	return retval;
4416 }
4417 
4418 static int sctp_setsockopt_pf_expose(struct sock *sk,
4419 				     struct sctp_assoc_value *params,
4420 				     unsigned int optlen)
4421 {
4422 	struct sctp_association *asoc;
4423 	int retval = -EINVAL;
4424 
4425 	if (optlen != sizeof(*params))
4426 		goto out;
4427 
4428 	if (params->assoc_value > SCTP_PF_EXPOSE_MAX)
4429 		goto out;
4430 
4431 	asoc = sctp_id2assoc(sk, params->assoc_id);
4432 	if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4433 	    sctp_style(sk, UDP))
4434 		goto out;
4435 
4436 	if (asoc)
4437 		asoc->pf_expose = params->assoc_value;
4438 	else
4439 		sctp_sk(sk)->pf_expose = params->assoc_value;
4440 	retval = 0;
4441 
4442 out:
4443 	return retval;
4444 }
4445 
4446 static int sctp_setsockopt_encap_port(struct sock *sk,
4447 				      struct sctp_udpencaps *encap,
4448 				      unsigned int optlen)
4449 {
4450 	struct sctp_association *asoc;
4451 	struct sctp_transport *t;
4452 	__be16 encap_port;
4453 
4454 	if (optlen != sizeof(*encap))
4455 		return -EINVAL;
4456 
4457 	/* If an address other than INADDR_ANY is specified, and
4458 	 * no transport is found, then the request is invalid.
4459 	 */
4460 	encap_port = (__force __be16)encap->sue_port;
4461 	if (!sctp_is_any(sk, (union sctp_addr *)&encap->sue_address)) {
4462 		t = sctp_addr_id2transport(sk, &encap->sue_address,
4463 					   encap->sue_assoc_id);
4464 		if (!t)
4465 			return -EINVAL;
4466 
4467 		t->encap_port = encap_port;
4468 		return 0;
4469 	}
4470 
4471 	/* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
4472 	 * socket is a one to many style socket, and an association
4473 	 * was not found, then the id was invalid.
4474 	 */
4475 	asoc = sctp_id2assoc(sk, encap->sue_assoc_id);
4476 	if (!asoc && encap->sue_assoc_id != SCTP_FUTURE_ASSOC &&
4477 	    sctp_style(sk, UDP))
4478 		return -EINVAL;
4479 
4480 	/* If changes are for association, also apply encap_port to
4481 	 * each transport.
4482 	 */
4483 	if (asoc) {
4484 		list_for_each_entry(t, &asoc->peer.transport_addr_list,
4485 				    transports)
4486 			t->encap_port = encap_port;
4487 
4488 		asoc->encap_port = encap_port;
4489 		return 0;
4490 	}
4491 
4492 	sctp_sk(sk)->encap_port = encap_port;
4493 	return 0;
4494 }
4495 
4496 static int sctp_setsockopt_probe_interval(struct sock *sk,
4497 					  struct sctp_probeinterval *params,
4498 					  unsigned int optlen)
4499 {
4500 	struct sctp_association *asoc;
4501 	struct sctp_transport *t;
4502 	__u32 probe_interval;
4503 
4504 	if (optlen != sizeof(*params))
4505 		return -EINVAL;
4506 
4507 	probe_interval = params->spi_interval;
4508 	if (probe_interval && probe_interval < SCTP_PROBE_TIMER_MIN)
4509 		return -EINVAL;
4510 
4511 	/* If an address other than INADDR_ANY is specified, and
4512 	 * no transport is found, then the request is invalid.
4513 	 */
4514 	if (!sctp_is_any(sk, (union sctp_addr *)&params->spi_address)) {
4515 		t = sctp_addr_id2transport(sk, &params->spi_address,
4516 					   params->spi_assoc_id);
4517 		if (!t)
4518 			return -EINVAL;
4519 
4520 		t->probe_interval = msecs_to_jiffies(probe_interval);
4521 		sctp_transport_pl_reset(t);
4522 		return 0;
4523 	}
4524 
4525 	/* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
4526 	 * socket is a one to many style socket, and an association
4527 	 * was not found, then the id was invalid.
4528 	 */
4529 	asoc = sctp_id2assoc(sk, params->spi_assoc_id);
4530 	if (!asoc && params->spi_assoc_id != SCTP_FUTURE_ASSOC &&
4531 	    sctp_style(sk, UDP))
4532 		return -EINVAL;
4533 
4534 	/* If changes are for association, also apply probe_interval to
4535 	 * each transport.
4536 	 */
4537 	if (asoc) {
4538 		list_for_each_entry(t, &asoc->peer.transport_addr_list, transports) {
4539 			t->probe_interval = msecs_to_jiffies(probe_interval);
4540 			sctp_transport_pl_reset(t);
4541 		}
4542 
4543 		asoc->probe_interval = msecs_to_jiffies(probe_interval);
4544 		return 0;
4545 	}
4546 
4547 	sctp_sk(sk)->probe_interval = probe_interval;
4548 	return 0;
4549 }
4550 
4551 /* API 6.2 setsockopt(), getsockopt()
4552  *
4553  * Applications use setsockopt() and getsockopt() to set or retrieve
4554  * socket options.  Socket options are used to change the default
4555  * behavior of sockets calls.  They are described in Section 7.
4556  *
4557  * The syntax is:
4558  *
4559  *   ret = getsockopt(int sd, int level, int optname, void __user *optval,
4560  *                    int __user *optlen);
4561  *   ret = setsockopt(int sd, int level, int optname, const void __user *optval,
4562  *                    int optlen);
4563  *
4564  *   sd      - the socket descript.
4565  *   level   - set to IPPROTO_SCTP for all SCTP options.
4566  *   optname - the option name.
4567  *   optval  - the buffer to store the value of the option.
4568  *   optlen  - the size of the buffer.
4569  */
4570 static int sctp_setsockopt(struct sock *sk, int level, int optname,
4571 			   sockptr_t optval, unsigned int optlen)
4572 {
4573 	void *kopt = NULL;
4574 	int retval = 0;
4575 
4576 	pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
4577 
4578 	/* I can hardly begin to describe how wrong this is.  This is
4579 	 * so broken as to be worse than useless.  The API draft
4580 	 * REALLY is NOT helpful here...  I am not convinced that the
4581 	 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
4582 	 * are at all well-founded.
4583 	 */
4584 	if (level != SOL_SCTP) {
4585 		struct sctp_af *af = sctp_sk(sk)->pf->af;
4586 
4587 		return af->setsockopt(sk, level, optname, optval, optlen);
4588 	}
4589 
4590 	if (optlen > 0) {
4591 		/* Trim it to the biggest size sctp sockopt may need if necessary */
4592 		optlen = min_t(unsigned int, optlen,
4593 			       PAGE_ALIGN(USHRT_MAX +
4594 					  sizeof(__u16) * sizeof(struct sctp_reset_streams)));
4595 		kopt = memdup_sockptr(optval, optlen);
4596 		if (IS_ERR(kopt))
4597 			return PTR_ERR(kopt);
4598 	}
4599 
4600 	lock_sock(sk);
4601 
4602 	switch (optname) {
4603 	case SCTP_SOCKOPT_BINDX_ADD:
4604 		/* 'optlen' is the size of the addresses buffer. */
4605 		retval = sctp_setsockopt_bindx(sk, kopt, optlen,
4606 					       SCTP_BINDX_ADD_ADDR);
4607 		break;
4608 
4609 	case SCTP_SOCKOPT_BINDX_REM:
4610 		/* 'optlen' is the size of the addresses buffer. */
4611 		retval = sctp_setsockopt_bindx(sk, kopt, optlen,
4612 					       SCTP_BINDX_REM_ADDR);
4613 		break;
4614 
4615 	case SCTP_SOCKOPT_CONNECTX_OLD:
4616 		/* 'optlen' is the size of the addresses buffer. */
4617 		retval = sctp_setsockopt_connectx_old(sk, kopt, optlen);
4618 		break;
4619 
4620 	case SCTP_SOCKOPT_CONNECTX:
4621 		/* 'optlen' is the size of the addresses buffer. */
4622 		retval = sctp_setsockopt_connectx(sk, kopt, optlen);
4623 		break;
4624 
4625 	case SCTP_DISABLE_FRAGMENTS:
4626 		retval = sctp_setsockopt_disable_fragments(sk, kopt, optlen);
4627 		break;
4628 
4629 	case SCTP_EVENTS:
4630 		retval = sctp_setsockopt_events(sk, kopt, optlen);
4631 		break;
4632 
4633 	case SCTP_AUTOCLOSE:
4634 		retval = sctp_setsockopt_autoclose(sk, kopt, optlen);
4635 		break;
4636 
4637 	case SCTP_PEER_ADDR_PARAMS:
4638 		retval = sctp_setsockopt_peer_addr_params(sk, kopt, optlen);
4639 		break;
4640 
4641 	case SCTP_DELAYED_SACK:
4642 		retval = sctp_setsockopt_delayed_ack(sk, kopt, optlen);
4643 		break;
4644 	case SCTP_PARTIAL_DELIVERY_POINT:
4645 		retval = sctp_setsockopt_partial_delivery_point(sk, kopt, optlen);
4646 		break;
4647 
4648 	case SCTP_INITMSG:
4649 		retval = sctp_setsockopt_initmsg(sk, kopt, optlen);
4650 		break;
4651 	case SCTP_DEFAULT_SEND_PARAM:
4652 		retval = sctp_setsockopt_default_send_param(sk, kopt, optlen);
4653 		break;
4654 	case SCTP_DEFAULT_SNDINFO:
4655 		retval = sctp_setsockopt_default_sndinfo(sk, kopt, optlen);
4656 		break;
4657 	case SCTP_PRIMARY_ADDR:
4658 		retval = sctp_setsockopt_primary_addr(sk, kopt, optlen);
4659 		break;
4660 	case SCTP_SET_PEER_PRIMARY_ADDR:
4661 		retval = sctp_setsockopt_peer_primary_addr(sk, kopt, optlen);
4662 		break;
4663 	case SCTP_NODELAY:
4664 		retval = sctp_setsockopt_nodelay(sk, kopt, optlen);
4665 		break;
4666 	case SCTP_RTOINFO:
4667 		retval = sctp_setsockopt_rtoinfo(sk, kopt, optlen);
4668 		break;
4669 	case SCTP_ASSOCINFO:
4670 		retval = sctp_setsockopt_associnfo(sk, kopt, optlen);
4671 		break;
4672 	case SCTP_I_WANT_MAPPED_V4_ADDR:
4673 		retval = sctp_setsockopt_mappedv4(sk, kopt, optlen);
4674 		break;
4675 	case SCTP_MAXSEG:
4676 		retval = sctp_setsockopt_maxseg(sk, kopt, optlen);
4677 		break;
4678 	case SCTP_ADAPTATION_LAYER:
4679 		retval = sctp_setsockopt_adaptation_layer(sk, kopt, optlen);
4680 		break;
4681 	case SCTP_CONTEXT:
4682 		retval = sctp_setsockopt_context(sk, kopt, optlen);
4683 		break;
4684 	case SCTP_FRAGMENT_INTERLEAVE:
4685 		retval = sctp_setsockopt_fragment_interleave(sk, kopt, optlen);
4686 		break;
4687 	case SCTP_MAX_BURST:
4688 		retval = sctp_setsockopt_maxburst(sk, kopt, optlen);
4689 		break;
4690 	case SCTP_AUTH_CHUNK:
4691 		retval = sctp_setsockopt_auth_chunk(sk, kopt, optlen);
4692 		break;
4693 	case SCTP_HMAC_IDENT:
4694 		retval = sctp_setsockopt_hmac_ident(sk, kopt, optlen);
4695 		break;
4696 	case SCTP_AUTH_KEY:
4697 		retval = sctp_setsockopt_auth_key(sk, kopt, optlen);
4698 		break;
4699 	case SCTP_AUTH_ACTIVE_KEY:
4700 		retval = sctp_setsockopt_active_key(sk, kopt, optlen);
4701 		break;
4702 	case SCTP_AUTH_DELETE_KEY:
4703 		retval = sctp_setsockopt_del_key(sk, kopt, optlen);
4704 		break;
4705 	case SCTP_AUTH_DEACTIVATE_KEY:
4706 		retval = sctp_setsockopt_deactivate_key(sk, kopt, optlen);
4707 		break;
4708 	case SCTP_AUTO_ASCONF:
4709 		retval = sctp_setsockopt_auto_asconf(sk, kopt, optlen);
4710 		break;
4711 	case SCTP_PEER_ADDR_THLDS:
4712 		retval = sctp_setsockopt_paddr_thresholds(sk, kopt, optlen,
4713 							  false);
4714 		break;
4715 	case SCTP_PEER_ADDR_THLDS_V2:
4716 		retval = sctp_setsockopt_paddr_thresholds(sk, kopt, optlen,
4717 							  true);
4718 		break;
4719 	case SCTP_RECVRCVINFO:
4720 		retval = sctp_setsockopt_recvrcvinfo(sk, kopt, optlen);
4721 		break;
4722 	case SCTP_RECVNXTINFO:
4723 		retval = sctp_setsockopt_recvnxtinfo(sk, kopt, optlen);
4724 		break;
4725 	case SCTP_PR_SUPPORTED:
4726 		retval = sctp_setsockopt_pr_supported(sk, kopt, optlen);
4727 		break;
4728 	case SCTP_DEFAULT_PRINFO:
4729 		retval = sctp_setsockopt_default_prinfo(sk, kopt, optlen);
4730 		break;
4731 	case SCTP_RECONFIG_SUPPORTED:
4732 		retval = sctp_setsockopt_reconfig_supported(sk, kopt, optlen);
4733 		break;
4734 	case SCTP_ENABLE_STREAM_RESET:
4735 		retval = sctp_setsockopt_enable_strreset(sk, kopt, optlen);
4736 		break;
4737 	case SCTP_RESET_STREAMS:
4738 		retval = sctp_setsockopt_reset_streams(sk, kopt, optlen);
4739 		break;
4740 	case SCTP_RESET_ASSOC:
4741 		retval = sctp_setsockopt_reset_assoc(sk, kopt, optlen);
4742 		break;
4743 	case SCTP_ADD_STREAMS:
4744 		retval = sctp_setsockopt_add_streams(sk, kopt, optlen);
4745 		break;
4746 	case SCTP_STREAM_SCHEDULER:
4747 		retval = sctp_setsockopt_scheduler(sk, kopt, optlen);
4748 		break;
4749 	case SCTP_STREAM_SCHEDULER_VALUE:
4750 		retval = sctp_setsockopt_scheduler_value(sk, kopt, optlen);
4751 		break;
4752 	case SCTP_INTERLEAVING_SUPPORTED:
4753 		retval = sctp_setsockopt_interleaving_supported(sk, kopt,
4754 								optlen);
4755 		break;
4756 	case SCTP_REUSE_PORT:
4757 		retval = sctp_setsockopt_reuse_port(sk, kopt, optlen);
4758 		break;
4759 	case SCTP_EVENT:
4760 		retval = sctp_setsockopt_event(sk, kopt, optlen);
4761 		break;
4762 	case SCTP_ASCONF_SUPPORTED:
4763 		retval = sctp_setsockopt_asconf_supported(sk, kopt, optlen);
4764 		break;
4765 	case SCTP_AUTH_SUPPORTED:
4766 		retval = sctp_setsockopt_auth_supported(sk, kopt, optlen);
4767 		break;
4768 	case SCTP_ECN_SUPPORTED:
4769 		retval = sctp_setsockopt_ecn_supported(sk, kopt, optlen);
4770 		break;
4771 	case SCTP_EXPOSE_POTENTIALLY_FAILED_STATE:
4772 		retval = sctp_setsockopt_pf_expose(sk, kopt, optlen);
4773 		break;
4774 	case SCTP_REMOTE_UDP_ENCAPS_PORT:
4775 		retval = sctp_setsockopt_encap_port(sk, kopt, optlen);
4776 		break;
4777 	case SCTP_PLPMTUD_PROBE_INTERVAL:
4778 		retval = sctp_setsockopt_probe_interval(sk, kopt, optlen);
4779 		break;
4780 	default:
4781 		retval = -ENOPROTOOPT;
4782 		break;
4783 	}
4784 
4785 	release_sock(sk);
4786 	kfree(kopt);
4787 	return retval;
4788 }
4789 
4790 /* API 3.1.6 connect() - UDP Style Syntax
4791  *
4792  * An application may use the connect() call in the UDP model to initiate an
4793  * association without sending data.
4794  *
4795  * The syntax is:
4796  *
4797  * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
4798  *
4799  * sd: the socket descriptor to have a new association added to.
4800  *
4801  * nam: the address structure (either struct sockaddr_in or struct
4802  *    sockaddr_in6 defined in RFC2553 [7]).
4803  *
4804  * len: the size of the address.
4805  */
4806 static int sctp_connect(struct sock *sk, struct sockaddr *addr,
4807 			int addr_len, int flags)
4808 {
4809 	struct sctp_af *af;
4810 	int err = -EINVAL;
4811 
4812 	lock_sock(sk);
4813 	pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__, sk,
4814 		 addr, addr_len);
4815 
4816 	/* Validate addr_len before calling common connect/connectx routine. */
4817 	af = sctp_get_af_specific(addr->sa_family);
4818 	if (af && addr_len >= af->sockaddr_len)
4819 		err = __sctp_connect(sk, addr, af->sockaddr_len, flags, NULL);
4820 
4821 	release_sock(sk);
4822 	return err;
4823 }
4824 
4825 int sctp_inet_connect(struct socket *sock, struct sockaddr *uaddr,
4826 		      int addr_len, int flags)
4827 {
4828 	if (addr_len < sizeof(uaddr->sa_family))
4829 		return -EINVAL;
4830 
4831 	if (uaddr->sa_family == AF_UNSPEC)
4832 		return -EOPNOTSUPP;
4833 
4834 	return sctp_connect(sock->sk, uaddr, addr_len, flags);
4835 }
4836 
4837 /* Only called when shutdown a listening SCTP socket. */
4838 static int sctp_disconnect(struct sock *sk, int flags)
4839 {
4840 	if (!sctp_style(sk, TCP))
4841 		return -EOPNOTSUPP;
4842 
4843 	sk->sk_shutdown |= RCV_SHUTDOWN;
4844 	return 0;
4845 }
4846 
4847 /* 4.1.4 accept() - TCP Style Syntax
4848  *
4849  * Applications use accept() call to remove an established SCTP
4850  * association from the accept queue of the endpoint.  A new socket
4851  * descriptor will be returned from accept() to represent the newly
4852  * formed association.
4853  */
4854 static struct sock *sctp_accept(struct sock *sk, struct proto_accept_arg *arg)
4855 {
4856 	struct sctp_sock *sp;
4857 	struct sctp_endpoint *ep;
4858 	struct sock *newsk = NULL;
4859 	struct sctp_association *asoc;
4860 	long timeo;
4861 	int error = 0;
4862 
4863 	lock_sock(sk);
4864 
4865 	sp = sctp_sk(sk);
4866 	ep = sp->ep;
4867 
4868 	if (!sctp_style(sk, TCP)) {
4869 		error = -EOPNOTSUPP;
4870 		goto out;
4871 	}
4872 
4873 	if (!sctp_sstate(sk, LISTENING) ||
4874 	    (sk->sk_shutdown & RCV_SHUTDOWN)) {
4875 		error = -EINVAL;
4876 		goto out;
4877 	}
4878 
4879 	timeo = sock_rcvtimeo(sk, arg->flags & O_NONBLOCK);
4880 
4881 	error = sctp_wait_for_accept(sk, timeo);
4882 	if (error)
4883 		goto out;
4884 
4885 	/* We treat the list of associations on the endpoint as the accept
4886 	 * queue and pick the first association on the list.
4887 	 */
4888 	asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
4889 
4890 	newsk = sp->pf->create_accept_sk(sk, asoc, arg->kern);
4891 	if (!newsk) {
4892 		error = -ENOMEM;
4893 		goto out;
4894 	}
4895 
4896 	/* Populate the fields of the newsk from the oldsk and migrate the
4897 	 * asoc to the newsk.
4898 	 */
4899 	error = sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
4900 	if (error) {
4901 		sk_common_release(newsk);
4902 		newsk = NULL;
4903 	}
4904 
4905 out:
4906 	release_sock(sk);
4907 	arg->err = error;
4908 	return newsk;
4909 }
4910 
4911 /* The SCTP ioctl handler. */
4912 static int sctp_ioctl(struct sock *sk, int cmd, int *karg)
4913 {
4914 	int rc = -ENOTCONN;
4915 
4916 	lock_sock(sk);
4917 
4918 	/*
4919 	 * SEQPACKET-style sockets in LISTENING state are valid, for
4920 	 * SCTP, so only discard TCP-style sockets in LISTENING state.
4921 	 */
4922 	if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
4923 		goto out;
4924 
4925 	switch (cmd) {
4926 	case SIOCINQ: {
4927 		struct sk_buff *skb;
4928 		*karg = 0;
4929 
4930 		skb = skb_peek(&sk->sk_receive_queue);
4931 		if (skb != NULL) {
4932 			/*
4933 			 * We will only return the amount of this packet since
4934 			 * that is all that will be read.
4935 			 */
4936 			*karg = skb->len;
4937 		}
4938 		rc = 0;
4939 		break;
4940 	}
4941 	default:
4942 		rc = -ENOIOCTLCMD;
4943 		break;
4944 	}
4945 out:
4946 	release_sock(sk);
4947 	return rc;
4948 }
4949 
4950 /* This is the function which gets called during socket creation to
4951  * initialized the SCTP-specific portion of the sock.
4952  * The sock structure should already be zero-filled memory.
4953  */
4954 static int sctp_init_sock(struct sock *sk)
4955 {
4956 	struct net *net = sock_net(sk);
4957 	struct sctp_sock *sp;
4958 
4959 	pr_debug("%s: sk:%p\n", __func__, sk);
4960 
4961 	sp = sctp_sk(sk);
4962 
4963 	/* Initialize the SCTP per socket area.  */
4964 	switch (sk->sk_type) {
4965 	case SOCK_SEQPACKET:
4966 		sp->type = SCTP_SOCKET_UDP;
4967 		break;
4968 	case SOCK_STREAM:
4969 		sp->type = SCTP_SOCKET_TCP;
4970 		break;
4971 	default:
4972 		return -ESOCKTNOSUPPORT;
4973 	}
4974 
4975 	sk->sk_gso_type = SKB_GSO_SCTP;
4976 
4977 	/* Initialize default send parameters. These parameters can be
4978 	 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
4979 	 */
4980 	sp->default_stream = 0;
4981 	sp->default_ppid = 0;
4982 	sp->default_flags = 0;
4983 	sp->default_context = 0;
4984 	sp->default_timetolive = 0;
4985 
4986 	sp->default_rcv_context = 0;
4987 	sp->max_burst = net->sctp.max_burst;
4988 
4989 	sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg;
4990 
4991 	/* Initialize default setup parameters. These parameters
4992 	 * can be modified with the SCTP_INITMSG socket option or
4993 	 * overridden by the SCTP_INIT CMSG.
4994 	 */
4995 	sp->initmsg.sinit_num_ostreams   = sctp_max_outstreams;
4996 	sp->initmsg.sinit_max_instreams  = sctp_max_instreams;
4997 	sp->initmsg.sinit_max_attempts   = net->sctp.max_retrans_init;
4998 	sp->initmsg.sinit_max_init_timeo = net->sctp.rto_max;
4999 
5000 	/* Initialize default RTO related parameters.  These parameters can
5001 	 * be modified for with the SCTP_RTOINFO socket option.
5002 	 */
5003 	sp->rtoinfo.srto_initial = net->sctp.rto_initial;
5004 	sp->rtoinfo.srto_max     = net->sctp.rto_max;
5005 	sp->rtoinfo.srto_min     = net->sctp.rto_min;
5006 
5007 	/* Initialize default association related parameters. These parameters
5008 	 * can be modified with the SCTP_ASSOCINFO socket option.
5009 	 */
5010 	sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association;
5011 	sp->assocparams.sasoc_number_peer_destinations = 0;
5012 	sp->assocparams.sasoc_peer_rwnd = 0;
5013 	sp->assocparams.sasoc_local_rwnd = 0;
5014 	sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life;
5015 
5016 	/* Initialize default event subscriptions. By default, all the
5017 	 * options are off.
5018 	 */
5019 	sp->subscribe = 0;
5020 
5021 	/* Default Peer Address Parameters.  These defaults can
5022 	 * be modified via SCTP_PEER_ADDR_PARAMS
5023 	 */
5024 	sp->hbinterval  = net->sctp.hb_interval;
5025 	sp->udp_port    = htons(net->sctp.udp_port);
5026 	sp->encap_port  = htons(net->sctp.encap_port);
5027 	sp->pathmaxrxt  = net->sctp.max_retrans_path;
5028 	sp->pf_retrans  = net->sctp.pf_retrans;
5029 	sp->ps_retrans  = net->sctp.ps_retrans;
5030 	sp->pf_expose   = net->sctp.pf_expose;
5031 	sp->pathmtu     = 0; /* allow default discovery */
5032 	sp->sackdelay   = net->sctp.sack_timeout;
5033 	sp->sackfreq	= 2;
5034 	sp->param_flags = SPP_HB_ENABLE |
5035 			  SPP_PMTUD_ENABLE |
5036 			  SPP_SACKDELAY_ENABLE;
5037 	sp->default_ss = SCTP_SS_DEFAULT;
5038 
5039 	/* If enabled no SCTP message fragmentation will be performed.
5040 	 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
5041 	 */
5042 	sp->disable_fragments = 0;
5043 
5044 	/* Enable Nagle algorithm by default.  */
5045 	sp->nodelay           = 0;
5046 
5047 	sp->recvrcvinfo = 0;
5048 	sp->recvnxtinfo = 0;
5049 
5050 	/* Enable by default. */
5051 	sp->v4mapped          = 1;
5052 
5053 	/* Auto-close idle associations after the configured
5054 	 * number of seconds.  A value of 0 disables this
5055 	 * feature.  Configure through the SCTP_AUTOCLOSE socket option,
5056 	 * for UDP-style sockets only.
5057 	 */
5058 	sp->autoclose         = 0;
5059 
5060 	/* User specified fragmentation limit. */
5061 	sp->user_frag         = 0;
5062 
5063 	sp->adaptation_ind = 0;
5064 
5065 	sp->pf = sctp_get_pf_specific(sk->sk_family);
5066 
5067 	/* Control variables for partial data delivery. */
5068 	atomic_set(&sp->pd_mode, 0);
5069 	skb_queue_head_init(&sp->pd_lobby);
5070 	sp->frag_interleave = 0;
5071 	sp->probe_interval = net->sctp.probe_interval;
5072 
5073 	/* Create a per socket endpoint structure.  Even if we
5074 	 * change the data structure relationships, this may still
5075 	 * be useful for storing pre-connect address information.
5076 	 */
5077 	sp->ep = sctp_endpoint_new(sk, GFP_KERNEL);
5078 	if (!sp->ep)
5079 		return -ENOMEM;
5080 
5081 	sp->hmac = NULL;
5082 
5083 	sk->sk_destruct = sctp_destruct_sock;
5084 
5085 	SCTP_DBG_OBJCNT_INC(sock);
5086 
5087 	sk_sockets_allocated_inc(sk);
5088 	sock_prot_inuse_add(net, sk->sk_prot, 1);
5089 
5090 	return 0;
5091 }
5092 
5093 /* Cleanup any SCTP per socket resources. Must be called with
5094  * sock_net(sk)->sctp.addr_wq_lock held if sp->do_auto_asconf is true
5095  */
5096 static void sctp_destroy_sock(struct sock *sk)
5097 {
5098 	struct sctp_sock *sp;
5099 
5100 	pr_debug("%s: sk:%p\n", __func__, sk);
5101 
5102 	/* Release our hold on the endpoint. */
5103 	sp = sctp_sk(sk);
5104 	/* This could happen during socket init, thus we bail out
5105 	 * early, since the rest of the below is not setup either.
5106 	 */
5107 	if (sp->ep == NULL)
5108 		return;
5109 
5110 	if (sp->do_auto_asconf) {
5111 		sp->do_auto_asconf = 0;
5112 		list_del(&sp->auto_asconf_list);
5113 	}
5114 	sctp_endpoint_free(sp->ep);
5115 	sk_sockets_allocated_dec(sk);
5116 	sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
5117 }
5118 
5119 /* Triggered when there are no references on the socket anymore */
5120 static void sctp_destruct_common(struct sock *sk)
5121 {
5122 	struct sctp_sock *sp = sctp_sk(sk);
5123 
5124 	/* Free up the HMAC transform. */
5125 	crypto_free_shash(sp->hmac);
5126 }
5127 
5128 static void sctp_destruct_sock(struct sock *sk)
5129 {
5130 	sctp_destruct_common(sk);
5131 	inet_sock_destruct(sk);
5132 }
5133 
5134 /* API 4.1.7 shutdown() - TCP Style Syntax
5135  *     int shutdown(int socket, int how);
5136  *
5137  *     sd      - the socket descriptor of the association to be closed.
5138  *     how     - Specifies the type of shutdown.  The  values  are
5139  *               as follows:
5140  *               SHUT_RD
5141  *                     Disables further receive operations. No SCTP
5142  *                     protocol action is taken.
5143  *               SHUT_WR
5144  *                     Disables further send operations, and initiates
5145  *                     the SCTP shutdown sequence.
5146  *               SHUT_RDWR
5147  *                     Disables further send  and  receive  operations
5148  *                     and initiates the SCTP shutdown sequence.
5149  */
5150 static void sctp_shutdown(struct sock *sk, int how)
5151 {
5152 	struct net *net = sock_net(sk);
5153 	struct sctp_endpoint *ep;
5154 
5155 	if (!sctp_style(sk, TCP))
5156 		return;
5157 
5158 	ep = sctp_sk(sk)->ep;
5159 	if (how & SEND_SHUTDOWN && !list_empty(&ep->asocs)) {
5160 		struct sctp_association *asoc;
5161 
5162 		inet_sk_set_state(sk, SCTP_SS_CLOSING);
5163 		asoc = list_entry(ep->asocs.next,
5164 				  struct sctp_association, asocs);
5165 		sctp_primitive_SHUTDOWN(net, asoc, NULL);
5166 	}
5167 }
5168 
5169 int sctp_get_sctp_info(struct sock *sk, struct sctp_association *asoc,
5170 		       struct sctp_info *info)
5171 {
5172 	struct sctp_transport *prim;
5173 	struct list_head *pos;
5174 	int mask;
5175 
5176 	memset(info, 0, sizeof(*info));
5177 	if (!asoc) {
5178 		struct sctp_sock *sp = sctp_sk(sk);
5179 
5180 		info->sctpi_s_autoclose = sp->autoclose;
5181 		info->sctpi_s_adaptation_ind = sp->adaptation_ind;
5182 		info->sctpi_s_pd_point = sp->pd_point;
5183 		info->sctpi_s_nodelay = sp->nodelay;
5184 		info->sctpi_s_disable_fragments = sp->disable_fragments;
5185 		info->sctpi_s_v4mapped = sp->v4mapped;
5186 		info->sctpi_s_frag_interleave = sp->frag_interleave;
5187 		info->sctpi_s_type = sp->type;
5188 
5189 		return 0;
5190 	}
5191 
5192 	info->sctpi_tag = asoc->c.my_vtag;
5193 	info->sctpi_state = asoc->state;
5194 	info->sctpi_rwnd = asoc->a_rwnd;
5195 	info->sctpi_unackdata = asoc->unack_data;
5196 	info->sctpi_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
5197 	info->sctpi_instrms = asoc->stream.incnt;
5198 	info->sctpi_outstrms = asoc->stream.outcnt;
5199 	list_for_each(pos, &asoc->base.inqueue.in_chunk_list)
5200 		info->sctpi_inqueue++;
5201 	list_for_each(pos, &asoc->outqueue.out_chunk_list)
5202 		info->sctpi_outqueue++;
5203 	info->sctpi_overall_error = asoc->overall_error_count;
5204 	info->sctpi_max_burst = asoc->max_burst;
5205 	info->sctpi_maxseg = asoc->frag_point;
5206 	info->sctpi_peer_rwnd = asoc->peer.rwnd;
5207 	info->sctpi_peer_tag = asoc->c.peer_vtag;
5208 
5209 	mask = asoc->peer.intl_capable << 1;
5210 	mask = (mask | asoc->peer.ecn_capable) << 1;
5211 	mask = (mask | asoc->peer.ipv4_address) << 1;
5212 	mask = (mask | asoc->peer.ipv6_address) << 1;
5213 	mask = (mask | asoc->peer.reconf_capable) << 1;
5214 	mask = (mask | asoc->peer.asconf_capable) << 1;
5215 	mask = (mask | asoc->peer.prsctp_capable) << 1;
5216 	mask = (mask | asoc->peer.auth_capable);
5217 	info->sctpi_peer_capable = mask;
5218 	mask = asoc->peer.sack_needed << 1;
5219 	mask = (mask | asoc->peer.sack_generation) << 1;
5220 	mask = (mask | asoc->peer.zero_window_announced);
5221 	info->sctpi_peer_sack = mask;
5222 
5223 	info->sctpi_isacks = asoc->stats.isacks;
5224 	info->sctpi_osacks = asoc->stats.osacks;
5225 	info->sctpi_opackets = asoc->stats.opackets;
5226 	info->sctpi_ipackets = asoc->stats.ipackets;
5227 	info->sctpi_rtxchunks = asoc->stats.rtxchunks;
5228 	info->sctpi_outofseqtsns = asoc->stats.outofseqtsns;
5229 	info->sctpi_idupchunks = asoc->stats.idupchunks;
5230 	info->sctpi_gapcnt = asoc->stats.gapcnt;
5231 	info->sctpi_ouodchunks = asoc->stats.ouodchunks;
5232 	info->sctpi_iuodchunks = asoc->stats.iuodchunks;
5233 	info->sctpi_oodchunks = asoc->stats.oodchunks;
5234 	info->sctpi_iodchunks = asoc->stats.iodchunks;
5235 	info->sctpi_octrlchunks = asoc->stats.octrlchunks;
5236 	info->sctpi_ictrlchunks = asoc->stats.ictrlchunks;
5237 
5238 	prim = asoc->peer.primary_path;
5239 	memcpy(&info->sctpi_p_address, &prim->ipaddr, sizeof(prim->ipaddr));
5240 	info->sctpi_p_state = prim->state;
5241 	info->sctpi_p_cwnd = prim->cwnd;
5242 	info->sctpi_p_srtt = prim->srtt;
5243 	info->sctpi_p_rto = jiffies_to_msecs(prim->rto);
5244 	info->sctpi_p_hbinterval = prim->hbinterval;
5245 	info->sctpi_p_pathmaxrxt = prim->pathmaxrxt;
5246 	info->sctpi_p_sackdelay = jiffies_to_msecs(prim->sackdelay);
5247 	info->sctpi_p_ssthresh = prim->ssthresh;
5248 	info->sctpi_p_partial_bytes_acked = prim->partial_bytes_acked;
5249 	info->sctpi_p_flight_size = prim->flight_size;
5250 	info->sctpi_p_error = prim->error_count;
5251 
5252 	return 0;
5253 }
5254 EXPORT_SYMBOL_GPL(sctp_get_sctp_info);
5255 
5256 /* use callback to avoid exporting the core structure */
5257 void sctp_transport_walk_start(struct rhashtable_iter *iter) __acquires(RCU)
5258 {
5259 	rhltable_walk_enter(&sctp_transport_hashtable, iter);
5260 
5261 	rhashtable_walk_start(iter);
5262 }
5263 
5264 void sctp_transport_walk_stop(struct rhashtable_iter *iter) __releases(RCU)
5265 {
5266 	rhashtable_walk_stop(iter);
5267 	rhashtable_walk_exit(iter);
5268 }
5269 
5270 struct sctp_transport *sctp_transport_get_next(struct net *net,
5271 					       struct rhashtable_iter *iter)
5272 {
5273 	struct sctp_transport *t;
5274 
5275 	t = rhashtable_walk_next(iter);
5276 	for (; t; t = rhashtable_walk_next(iter)) {
5277 		if (IS_ERR(t)) {
5278 			if (PTR_ERR(t) == -EAGAIN)
5279 				continue;
5280 			break;
5281 		}
5282 
5283 		if (!sctp_transport_hold(t))
5284 			continue;
5285 
5286 		if (net_eq(t->asoc->base.net, net) &&
5287 		    t->asoc->peer.primary_path == t)
5288 			break;
5289 
5290 		sctp_transport_put(t);
5291 	}
5292 
5293 	return t;
5294 }
5295 
5296 struct sctp_transport *sctp_transport_get_idx(struct net *net,
5297 					      struct rhashtable_iter *iter,
5298 					      int pos)
5299 {
5300 	struct sctp_transport *t;
5301 
5302 	if (!pos)
5303 		return SEQ_START_TOKEN;
5304 
5305 	while ((t = sctp_transport_get_next(net, iter)) && !IS_ERR(t)) {
5306 		if (!--pos)
5307 			break;
5308 		sctp_transport_put(t);
5309 	}
5310 
5311 	return t;
5312 }
5313 
5314 int sctp_for_each_endpoint(int (*cb)(struct sctp_endpoint *, void *),
5315 			   void *p) {
5316 	int err = 0;
5317 	int hash = 0;
5318 	struct sctp_endpoint *ep;
5319 	struct sctp_hashbucket *head;
5320 
5321 	for (head = sctp_ep_hashtable; hash < sctp_ep_hashsize;
5322 	     hash++, head++) {
5323 		read_lock_bh(&head->lock);
5324 		sctp_for_each_hentry(ep, &head->chain) {
5325 			err = cb(ep, p);
5326 			if (err)
5327 				break;
5328 		}
5329 		read_unlock_bh(&head->lock);
5330 	}
5331 
5332 	return err;
5333 }
5334 EXPORT_SYMBOL_GPL(sctp_for_each_endpoint);
5335 
5336 int sctp_transport_lookup_process(sctp_callback_t cb, struct net *net,
5337 				  const union sctp_addr *laddr,
5338 				  const union sctp_addr *paddr, void *p, int dif)
5339 {
5340 	struct sctp_transport *transport;
5341 	struct sctp_endpoint *ep;
5342 	int err = -ENOENT;
5343 
5344 	rcu_read_lock();
5345 	transport = sctp_addrs_lookup_transport(net, laddr, paddr, dif, dif);
5346 	if (!transport) {
5347 		rcu_read_unlock();
5348 		return err;
5349 	}
5350 	ep = transport->asoc->ep;
5351 	if (!sctp_endpoint_hold(ep)) { /* asoc can be peeled off */
5352 		sctp_transport_put(transport);
5353 		rcu_read_unlock();
5354 		return err;
5355 	}
5356 	rcu_read_unlock();
5357 
5358 	err = cb(ep, transport, p);
5359 	sctp_endpoint_put(ep);
5360 	sctp_transport_put(transport);
5361 	return err;
5362 }
5363 EXPORT_SYMBOL_GPL(sctp_transport_lookup_process);
5364 
5365 int sctp_transport_traverse_process(sctp_callback_t cb, sctp_callback_t cb_done,
5366 				    struct net *net, int *pos, void *p)
5367 {
5368 	struct rhashtable_iter hti;
5369 	struct sctp_transport *tsp;
5370 	struct sctp_endpoint *ep;
5371 	int ret;
5372 
5373 again:
5374 	ret = 0;
5375 	sctp_transport_walk_start(&hti);
5376 
5377 	tsp = sctp_transport_get_idx(net, &hti, *pos + 1);
5378 	for (; !IS_ERR_OR_NULL(tsp); tsp = sctp_transport_get_next(net, &hti)) {
5379 		ep = tsp->asoc->ep;
5380 		if (sctp_endpoint_hold(ep)) { /* asoc can be peeled off */
5381 			ret = cb(ep, tsp, p);
5382 			if (ret)
5383 				break;
5384 			sctp_endpoint_put(ep);
5385 		}
5386 		(*pos)++;
5387 		sctp_transport_put(tsp);
5388 	}
5389 	sctp_transport_walk_stop(&hti);
5390 
5391 	if (ret) {
5392 		if (cb_done && !cb_done(ep, tsp, p)) {
5393 			(*pos)++;
5394 			sctp_endpoint_put(ep);
5395 			sctp_transport_put(tsp);
5396 			goto again;
5397 		}
5398 		sctp_endpoint_put(ep);
5399 		sctp_transport_put(tsp);
5400 	}
5401 
5402 	return ret;
5403 }
5404 EXPORT_SYMBOL_GPL(sctp_transport_traverse_process);
5405 
5406 /* 7.2.1 Association Status (SCTP_STATUS)
5407 
5408  * Applications can retrieve current status information about an
5409  * association, including association state, peer receiver window size,
5410  * number of unacked data chunks, and number of data chunks pending
5411  * receipt.  This information is read-only.
5412  */
5413 static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
5414 				       char __user *optval,
5415 				       int __user *optlen)
5416 {
5417 	struct sctp_status status;
5418 	struct sctp_association *asoc = NULL;
5419 	struct sctp_transport *transport;
5420 	sctp_assoc_t associd;
5421 	int retval = 0;
5422 
5423 	if (len < sizeof(status)) {
5424 		retval = -EINVAL;
5425 		goto out;
5426 	}
5427 
5428 	len = sizeof(status);
5429 	if (copy_from_user(&status, optval, len)) {
5430 		retval = -EFAULT;
5431 		goto out;
5432 	}
5433 
5434 	associd = status.sstat_assoc_id;
5435 	asoc = sctp_id2assoc(sk, associd);
5436 	if (!asoc) {
5437 		retval = -EINVAL;
5438 		goto out;
5439 	}
5440 
5441 	transport = asoc->peer.primary_path;
5442 
5443 	status.sstat_assoc_id = sctp_assoc2id(asoc);
5444 	status.sstat_state = sctp_assoc_to_state(asoc);
5445 	status.sstat_rwnd =  asoc->peer.rwnd;
5446 	status.sstat_unackdata = asoc->unack_data;
5447 
5448 	status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
5449 	status.sstat_instrms = asoc->stream.incnt;
5450 	status.sstat_outstrms = asoc->stream.outcnt;
5451 	status.sstat_fragmentation_point = asoc->frag_point;
5452 	status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
5453 	memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
5454 			transport->af_specific->sockaddr_len);
5455 	/* Map ipv4 address into v4-mapped-on-v6 address.  */
5456 	sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
5457 		(union sctp_addr *)&status.sstat_primary.spinfo_address);
5458 	status.sstat_primary.spinfo_state = transport->state;
5459 	status.sstat_primary.spinfo_cwnd = transport->cwnd;
5460 	status.sstat_primary.spinfo_srtt = transport->srtt;
5461 	status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
5462 	status.sstat_primary.spinfo_mtu = transport->pathmtu;
5463 
5464 	if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
5465 		status.sstat_primary.spinfo_state = SCTP_ACTIVE;
5466 
5467 	if (put_user(len, optlen)) {
5468 		retval = -EFAULT;
5469 		goto out;
5470 	}
5471 
5472 	pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n",
5473 		 __func__, len, status.sstat_state, status.sstat_rwnd,
5474 		 status.sstat_assoc_id);
5475 
5476 	if (copy_to_user(optval, &status, len)) {
5477 		retval = -EFAULT;
5478 		goto out;
5479 	}
5480 
5481 out:
5482 	return retval;
5483 }
5484 
5485 
5486 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
5487  *
5488  * Applications can retrieve information about a specific peer address
5489  * of an association, including its reachability state, congestion
5490  * window, and retransmission timer values.  This information is
5491  * read-only.
5492  */
5493 static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
5494 					  char __user *optval,
5495 					  int __user *optlen)
5496 {
5497 	struct sctp_paddrinfo pinfo;
5498 	struct sctp_transport *transport;
5499 	int retval = 0;
5500 
5501 	if (len < sizeof(pinfo)) {
5502 		retval = -EINVAL;
5503 		goto out;
5504 	}
5505 
5506 	len = sizeof(pinfo);
5507 	if (copy_from_user(&pinfo, optval, len)) {
5508 		retval = -EFAULT;
5509 		goto out;
5510 	}
5511 
5512 	transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
5513 					   pinfo.spinfo_assoc_id);
5514 	if (!transport) {
5515 		retval = -EINVAL;
5516 		goto out;
5517 	}
5518 
5519 	if (transport->state == SCTP_PF &&
5520 	    transport->asoc->pf_expose == SCTP_PF_EXPOSE_DISABLE) {
5521 		retval = -EACCES;
5522 		goto out;
5523 	}
5524 
5525 	pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
5526 	pinfo.spinfo_state = transport->state;
5527 	pinfo.spinfo_cwnd = transport->cwnd;
5528 	pinfo.spinfo_srtt = transport->srtt;
5529 	pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
5530 	pinfo.spinfo_mtu = transport->pathmtu;
5531 
5532 	if (pinfo.spinfo_state == SCTP_UNKNOWN)
5533 		pinfo.spinfo_state = SCTP_ACTIVE;
5534 
5535 	if (put_user(len, optlen)) {
5536 		retval = -EFAULT;
5537 		goto out;
5538 	}
5539 
5540 	if (copy_to_user(optval, &pinfo, len)) {
5541 		retval = -EFAULT;
5542 		goto out;
5543 	}
5544 
5545 out:
5546 	return retval;
5547 }
5548 
5549 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
5550  *
5551  * This option is a on/off flag.  If enabled no SCTP message
5552  * fragmentation will be performed.  Instead if a message being sent
5553  * exceeds the current PMTU size, the message will NOT be sent and
5554  * instead a error will be indicated to the user.
5555  */
5556 static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
5557 					char __user *optval, int __user *optlen)
5558 {
5559 	int val;
5560 
5561 	if (len < sizeof(int))
5562 		return -EINVAL;
5563 
5564 	len = sizeof(int);
5565 	val = (sctp_sk(sk)->disable_fragments == 1);
5566 	if (put_user(len, optlen))
5567 		return -EFAULT;
5568 	if (copy_to_user(optval, &val, len))
5569 		return -EFAULT;
5570 	return 0;
5571 }
5572 
5573 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
5574  *
5575  * This socket option is used to specify various notifications and
5576  * ancillary data the user wishes to receive.
5577  */
5578 static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
5579 				  int __user *optlen)
5580 {
5581 	struct sctp_event_subscribe subscribe;
5582 	__u8 *sn_type = (__u8 *)&subscribe;
5583 	int i;
5584 
5585 	if (len == 0)
5586 		return -EINVAL;
5587 	if (len > sizeof(struct sctp_event_subscribe))
5588 		len = sizeof(struct sctp_event_subscribe);
5589 	if (put_user(len, optlen))
5590 		return -EFAULT;
5591 
5592 	for (i = 0; i < len; i++)
5593 		sn_type[i] = sctp_ulpevent_type_enabled(sctp_sk(sk)->subscribe,
5594 							SCTP_SN_TYPE_BASE + i);
5595 
5596 	if (copy_to_user(optval, &subscribe, len))
5597 		return -EFAULT;
5598 
5599 	return 0;
5600 }
5601 
5602 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
5603  *
5604  * This socket option is applicable to the UDP-style socket only.  When
5605  * set it will cause associations that are idle for more than the
5606  * specified number of seconds to automatically close.  An association
5607  * being idle is defined an association that has NOT sent or received
5608  * user data.  The special value of '0' indicates that no automatic
5609  * close of any associations should be performed.  The option expects an
5610  * integer defining the number of seconds of idle time before an
5611  * association is closed.
5612  */
5613 static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
5614 {
5615 	/* Applicable to UDP-style socket only */
5616 	if (sctp_style(sk, TCP))
5617 		return -EOPNOTSUPP;
5618 	if (len < sizeof(int))
5619 		return -EINVAL;
5620 	len = sizeof(int);
5621 	if (put_user(len, optlen))
5622 		return -EFAULT;
5623 	if (put_user(sctp_sk(sk)->autoclose, (int __user *)optval))
5624 		return -EFAULT;
5625 	return 0;
5626 }
5627 
5628 /* Helper routine to branch off an association to a new socket.  */
5629 int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
5630 {
5631 	struct sctp_association *asoc = sctp_id2assoc(sk, id);
5632 	struct sctp_sock *sp = sctp_sk(sk);
5633 	struct socket *sock;
5634 	int err = 0;
5635 
5636 	/* Do not peel off from one netns to another one. */
5637 	if (!net_eq(current->nsproxy->net_ns, sock_net(sk)))
5638 		return -EINVAL;
5639 
5640 	if (!asoc)
5641 		return -EINVAL;
5642 
5643 	/* An association cannot be branched off from an already peeled-off
5644 	 * socket, nor is this supported for tcp style sockets.
5645 	 */
5646 	if (!sctp_style(sk, UDP))
5647 		return -EINVAL;
5648 
5649 	/* Create a new socket.  */
5650 	err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
5651 	if (err < 0)
5652 		return err;
5653 
5654 	sctp_copy_sock(sock->sk, sk, asoc);
5655 
5656 	/* Make peeled-off sockets more like 1-1 accepted sockets.
5657 	 * Set the daddr and initialize id to something more random and also
5658 	 * copy over any ip options.
5659 	 */
5660 	sp->pf->to_sk_daddr(&asoc->peer.primary_addr, sock->sk);
5661 	sp->pf->copy_ip_options(sk, sock->sk);
5662 
5663 	/* Populate the fields of the newsk from the oldsk and migrate the
5664 	 * asoc to the newsk.
5665 	 */
5666 	err = sctp_sock_migrate(sk, sock->sk, asoc,
5667 				SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
5668 	if (err) {
5669 		sock_release(sock);
5670 		sock = NULL;
5671 	}
5672 
5673 	*sockp = sock;
5674 
5675 	return err;
5676 }
5677 EXPORT_SYMBOL(sctp_do_peeloff);
5678 
5679 static int sctp_getsockopt_peeloff_common(struct sock *sk, sctp_peeloff_arg_t *peeloff,
5680 					  struct file **newfile, unsigned flags)
5681 {
5682 	struct socket *newsock;
5683 	int retval;
5684 
5685 	retval = sctp_do_peeloff(sk, peeloff->associd, &newsock);
5686 	if (retval < 0)
5687 		goto out;
5688 
5689 	/* Map the socket to an unused fd that can be returned to the user.  */
5690 	retval = get_unused_fd_flags(flags & SOCK_CLOEXEC);
5691 	if (retval < 0) {
5692 		sock_release(newsock);
5693 		goto out;
5694 	}
5695 
5696 	*newfile = sock_alloc_file(newsock, 0, NULL);
5697 	if (IS_ERR(*newfile)) {
5698 		put_unused_fd(retval);
5699 		retval = PTR_ERR(*newfile);
5700 		*newfile = NULL;
5701 		return retval;
5702 	}
5703 
5704 	pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__, sk, newsock->sk,
5705 		 retval);
5706 
5707 	peeloff->sd = retval;
5708 
5709 	if (flags & SOCK_NONBLOCK)
5710 		(*newfile)->f_flags |= O_NONBLOCK;
5711 out:
5712 	return retval;
5713 }
5714 
5715 static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
5716 {
5717 	sctp_peeloff_arg_t peeloff;
5718 	struct file *newfile = NULL;
5719 	int retval = 0;
5720 
5721 	if (len < sizeof(sctp_peeloff_arg_t))
5722 		return -EINVAL;
5723 	len = sizeof(sctp_peeloff_arg_t);
5724 	if (copy_from_user(&peeloff, optval, len))
5725 		return -EFAULT;
5726 
5727 	retval = sctp_getsockopt_peeloff_common(sk, &peeloff, &newfile, 0);
5728 	if (retval < 0)
5729 		goto out;
5730 
5731 	/* Return the fd mapped to the new socket.  */
5732 	if (put_user(len, optlen)) {
5733 		fput(newfile);
5734 		put_unused_fd(retval);
5735 		return -EFAULT;
5736 	}
5737 
5738 	if (copy_to_user(optval, &peeloff, len)) {
5739 		fput(newfile);
5740 		put_unused_fd(retval);
5741 		return -EFAULT;
5742 	}
5743 	fd_install(retval, newfile);
5744 out:
5745 	return retval;
5746 }
5747 
5748 static int sctp_getsockopt_peeloff_flags(struct sock *sk, int len,
5749 					 char __user *optval, int __user *optlen)
5750 {
5751 	sctp_peeloff_flags_arg_t peeloff;
5752 	struct file *newfile = NULL;
5753 	int retval = 0;
5754 
5755 	if (len < sizeof(sctp_peeloff_flags_arg_t))
5756 		return -EINVAL;
5757 	len = sizeof(sctp_peeloff_flags_arg_t);
5758 	if (copy_from_user(&peeloff, optval, len))
5759 		return -EFAULT;
5760 
5761 	retval = sctp_getsockopt_peeloff_common(sk, &peeloff.p_arg,
5762 						&newfile, peeloff.flags);
5763 	if (retval < 0)
5764 		goto out;
5765 
5766 	/* Return the fd mapped to the new socket.  */
5767 	if (put_user(len, optlen)) {
5768 		fput(newfile);
5769 		put_unused_fd(retval);
5770 		return -EFAULT;
5771 	}
5772 
5773 	if (copy_to_user(optval, &peeloff, len)) {
5774 		fput(newfile);
5775 		put_unused_fd(retval);
5776 		return -EFAULT;
5777 	}
5778 	fd_install(retval, newfile);
5779 out:
5780 	return retval;
5781 }
5782 
5783 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
5784  *
5785  * Applications can enable or disable heartbeats for any peer address of
5786  * an association, modify an address's heartbeat interval, force a
5787  * heartbeat to be sent immediately, and adjust the address's maximum
5788  * number of retransmissions sent before an address is considered
5789  * unreachable.  The following structure is used to access and modify an
5790  * address's parameters:
5791  *
5792  *  struct sctp_paddrparams {
5793  *     sctp_assoc_t            spp_assoc_id;
5794  *     struct sockaddr_storage spp_address;
5795  *     uint32_t                spp_hbinterval;
5796  *     uint16_t                spp_pathmaxrxt;
5797  *     uint32_t                spp_pathmtu;
5798  *     uint32_t                spp_sackdelay;
5799  *     uint32_t                spp_flags;
5800  * };
5801  *
5802  *   spp_assoc_id    - (one-to-many style socket) This is filled in the
5803  *                     application, and identifies the association for
5804  *                     this query.
5805  *   spp_address     - This specifies which address is of interest.
5806  *   spp_hbinterval  - This contains the value of the heartbeat interval,
5807  *                     in milliseconds.  If a  value of zero
5808  *                     is present in this field then no changes are to
5809  *                     be made to this parameter.
5810  *   spp_pathmaxrxt  - This contains the maximum number of
5811  *                     retransmissions before this address shall be
5812  *                     considered unreachable. If a  value of zero
5813  *                     is present in this field then no changes are to
5814  *                     be made to this parameter.
5815  *   spp_pathmtu     - When Path MTU discovery is disabled the value
5816  *                     specified here will be the "fixed" path mtu.
5817  *                     Note that if the spp_address field is empty
5818  *                     then all associations on this address will
5819  *                     have this fixed path mtu set upon them.
5820  *
5821  *   spp_sackdelay   - When delayed sack is enabled, this value specifies
5822  *                     the number of milliseconds that sacks will be delayed
5823  *                     for. This value will apply to all addresses of an
5824  *                     association if the spp_address field is empty. Note
5825  *                     also, that if delayed sack is enabled and this
5826  *                     value is set to 0, no change is made to the last
5827  *                     recorded delayed sack timer value.
5828  *
5829  *   spp_flags       - These flags are used to control various features
5830  *                     on an association. The flag field may contain
5831  *                     zero or more of the following options.
5832  *
5833  *                     SPP_HB_ENABLE  - Enable heartbeats on the
5834  *                     specified address. Note that if the address
5835  *                     field is empty all addresses for the association
5836  *                     have heartbeats enabled upon them.
5837  *
5838  *                     SPP_HB_DISABLE - Disable heartbeats on the
5839  *                     speicifed address. Note that if the address
5840  *                     field is empty all addresses for the association
5841  *                     will have their heartbeats disabled. Note also
5842  *                     that SPP_HB_ENABLE and SPP_HB_DISABLE are
5843  *                     mutually exclusive, only one of these two should
5844  *                     be specified. Enabling both fields will have
5845  *                     undetermined results.
5846  *
5847  *                     SPP_HB_DEMAND - Request a user initiated heartbeat
5848  *                     to be made immediately.
5849  *
5850  *                     SPP_PMTUD_ENABLE - This field will enable PMTU
5851  *                     discovery upon the specified address. Note that
5852  *                     if the address feild is empty then all addresses
5853  *                     on the association are effected.
5854  *
5855  *                     SPP_PMTUD_DISABLE - This field will disable PMTU
5856  *                     discovery upon the specified address. Note that
5857  *                     if the address feild is empty then all addresses
5858  *                     on the association are effected. Not also that
5859  *                     SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
5860  *                     exclusive. Enabling both will have undetermined
5861  *                     results.
5862  *
5863  *                     SPP_SACKDELAY_ENABLE - Setting this flag turns
5864  *                     on delayed sack. The time specified in spp_sackdelay
5865  *                     is used to specify the sack delay for this address. Note
5866  *                     that if spp_address is empty then all addresses will
5867  *                     enable delayed sack and take on the sack delay
5868  *                     value specified in spp_sackdelay.
5869  *                     SPP_SACKDELAY_DISABLE - Setting this flag turns
5870  *                     off delayed sack. If the spp_address field is blank then
5871  *                     delayed sack is disabled for the entire association. Note
5872  *                     also that this field is mutually exclusive to
5873  *                     SPP_SACKDELAY_ENABLE, setting both will have undefined
5874  *                     results.
5875  *
5876  *                     SPP_IPV6_FLOWLABEL:  Setting this flag enables the
5877  *                     setting of the IPV6 flow label value.  The value is
5878  *                     contained in the spp_ipv6_flowlabel field.
5879  *                     Upon retrieval, this flag will be set to indicate that
5880  *                     the spp_ipv6_flowlabel field has a valid value returned.
5881  *                     If a specific destination address is set (in the
5882  *                     spp_address field), then the value returned is that of
5883  *                     the address.  If just an association is specified (and
5884  *                     no address), then the association's default flow label
5885  *                     is returned.  If neither an association nor a destination
5886  *                     is specified, then the socket's default flow label is
5887  *                     returned.  For non-IPv6 sockets, this flag will be left
5888  *                     cleared.
5889  *
5890  *                     SPP_DSCP:  Setting this flag enables the setting of the
5891  *                     Differentiated Services Code Point (DSCP) value
5892  *                     associated with either the association or a specific
5893  *                     address.  The value is obtained in the spp_dscp field.
5894  *                     Upon retrieval, this flag will be set to indicate that
5895  *                     the spp_dscp field has a valid value returned.  If a
5896  *                     specific destination address is set when called (in the
5897  *                     spp_address field), then that specific destination
5898  *                     address's DSCP value is returned.  If just an association
5899  *                     is specified, then the association's default DSCP is
5900  *                     returned.  If neither an association nor a destination is
5901  *                     specified, then the socket's default DSCP is returned.
5902  *
5903  *   spp_ipv6_flowlabel
5904  *                   - This field is used in conjunction with the
5905  *                     SPP_IPV6_FLOWLABEL flag and contains the IPv6 flow label.
5906  *                     The 20 least significant bits are used for the flow
5907  *                     label.  This setting has precedence over any IPv6-layer
5908  *                     setting.
5909  *
5910  *   spp_dscp        - This field is used in conjunction with the SPP_DSCP flag
5911  *                     and contains the DSCP.  The 6 most significant bits are
5912  *                     used for the DSCP.  This setting has precedence over any
5913  *                     IPv4- or IPv6- layer setting.
5914  */
5915 static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
5916 					    char __user *optval, int __user *optlen)
5917 {
5918 	struct sctp_paddrparams  params;
5919 	struct sctp_transport   *trans = NULL;
5920 	struct sctp_association *asoc = NULL;
5921 	struct sctp_sock        *sp = sctp_sk(sk);
5922 
5923 	if (len >= sizeof(params))
5924 		len = sizeof(params);
5925 	else if (len >= ALIGN(offsetof(struct sctp_paddrparams,
5926 				       spp_ipv6_flowlabel), 4))
5927 		len = ALIGN(offsetof(struct sctp_paddrparams,
5928 				     spp_ipv6_flowlabel), 4);
5929 	else
5930 		return -EINVAL;
5931 
5932 	if (copy_from_user(&params, optval, len))
5933 		return -EFAULT;
5934 
5935 	/* If an address other than INADDR_ANY is specified, and
5936 	 * no transport is found, then the request is invalid.
5937 	 */
5938 	if (!sctp_is_any(sk, (union sctp_addr *)&params.spp_address)) {
5939 		trans = sctp_addr_id2transport(sk, &params.spp_address,
5940 					       params.spp_assoc_id);
5941 		if (!trans) {
5942 			pr_debug("%s: failed no transport\n", __func__);
5943 			return -EINVAL;
5944 		}
5945 	}
5946 
5947 	/* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
5948 	 * socket is a one to many style socket, and an association
5949 	 * was not found, then the id was invalid.
5950 	 */
5951 	asoc = sctp_id2assoc(sk, params.spp_assoc_id);
5952 	if (!asoc && params.spp_assoc_id != SCTP_FUTURE_ASSOC &&
5953 	    sctp_style(sk, UDP)) {
5954 		pr_debug("%s: failed no association\n", __func__);
5955 		return -EINVAL;
5956 	}
5957 
5958 	if (trans) {
5959 		/* Fetch transport values. */
5960 		params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
5961 		params.spp_pathmtu    = trans->pathmtu;
5962 		params.spp_pathmaxrxt = trans->pathmaxrxt;
5963 		params.spp_sackdelay  = jiffies_to_msecs(trans->sackdelay);
5964 
5965 		/*draft-11 doesn't say what to return in spp_flags*/
5966 		params.spp_flags      = trans->param_flags;
5967 		if (trans->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5968 			params.spp_ipv6_flowlabel = trans->flowlabel &
5969 						    SCTP_FLOWLABEL_VAL_MASK;
5970 			params.spp_flags |= SPP_IPV6_FLOWLABEL;
5971 		}
5972 		if (trans->dscp & SCTP_DSCP_SET_MASK) {
5973 			params.spp_dscp	= trans->dscp & SCTP_DSCP_VAL_MASK;
5974 			params.spp_flags |= SPP_DSCP;
5975 		}
5976 	} else if (asoc) {
5977 		/* Fetch association values. */
5978 		params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
5979 		params.spp_pathmtu    = asoc->pathmtu;
5980 		params.spp_pathmaxrxt = asoc->pathmaxrxt;
5981 		params.spp_sackdelay  = jiffies_to_msecs(asoc->sackdelay);
5982 
5983 		/*draft-11 doesn't say what to return in spp_flags*/
5984 		params.spp_flags      = asoc->param_flags;
5985 		if (asoc->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5986 			params.spp_ipv6_flowlabel = asoc->flowlabel &
5987 						    SCTP_FLOWLABEL_VAL_MASK;
5988 			params.spp_flags |= SPP_IPV6_FLOWLABEL;
5989 		}
5990 		if (asoc->dscp & SCTP_DSCP_SET_MASK) {
5991 			params.spp_dscp	= asoc->dscp & SCTP_DSCP_VAL_MASK;
5992 			params.spp_flags |= SPP_DSCP;
5993 		}
5994 	} else {
5995 		/* Fetch socket values. */
5996 		params.spp_hbinterval = sp->hbinterval;
5997 		params.spp_pathmtu    = sp->pathmtu;
5998 		params.spp_sackdelay  = sp->sackdelay;
5999 		params.spp_pathmaxrxt = sp->pathmaxrxt;
6000 
6001 		/*draft-11 doesn't say what to return in spp_flags*/
6002 		params.spp_flags      = sp->param_flags;
6003 		if (sp->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
6004 			params.spp_ipv6_flowlabel = sp->flowlabel &
6005 						    SCTP_FLOWLABEL_VAL_MASK;
6006 			params.spp_flags |= SPP_IPV6_FLOWLABEL;
6007 		}
6008 		if (sp->dscp & SCTP_DSCP_SET_MASK) {
6009 			params.spp_dscp	= sp->dscp & SCTP_DSCP_VAL_MASK;
6010 			params.spp_flags |= SPP_DSCP;
6011 		}
6012 	}
6013 
6014 	if (copy_to_user(optval, &params, len))
6015 		return -EFAULT;
6016 
6017 	if (put_user(len, optlen))
6018 		return -EFAULT;
6019 
6020 	return 0;
6021 }
6022 
6023 /*
6024  * 7.1.23.  Get or set delayed ack timer (SCTP_DELAYED_SACK)
6025  *
6026  * This option will effect the way delayed acks are performed.  This
6027  * option allows you to get or set the delayed ack time, in
6028  * milliseconds.  It also allows changing the delayed ack frequency.
6029  * Changing the frequency to 1 disables the delayed sack algorithm.  If
6030  * the assoc_id is 0, then this sets or gets the endpoints default
6031  * values.  If the assoc_id field is non-zero, then the set or get
6032  * effects the specified association for the one to many model (the
6033  * assoc_id field is ignored by the one to one model).  Note that if
6034  * sack_delay or sack_freq are 0 when setting this option, then the
6035  * current values will remain unchanged.
6036  *
6037  * struct sctp_sack_info {
6038  *     sctp_assoc_t            sack_assoc_id;
6039  *     uint32_t                sack_delay;
6040  *     uint32_t                sack_freq;
6041  * };
6042  *
6043  * sack_assoc_id -  This parameter, indicates which association the user
6044  *    is performing an action upon.  Note that if this field's value is
6045  *    zero then the endpoints default value is changed (effecting future
6046  *    associations only).
6047  *
6048  * sack_delay -  This parameter contains the number of milliseconds that
6049  *    the user is requesting the delayed ACK timer be set to.  Note that
6050  *    this value is defined in the standard to be between 200 and 500
6051  *    milliseconds.
6052  *
6053  * sack_freq -  This parameter contains the number of packets that must
6054  *    be received before a sack is sent without waiting for the delay
6055  *    timer to expire.  The default value for this is 2, setting this
6056  *    value to 1 will disable the delayed sack algorithm.
6057  */
6058 static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
6059 					    char __user *optval,
6060 					    int __user *optlen)
6061 {
6062 	struct sctp_sack_info    params;
6063 	struct sctp_association *asoc = NULL;
6064 	struct sctp_sock        *sp = sctp_sk(sk);
6065 
6066 	if (len >= sizeof(struct sctp_sack_info)) {
6067 		len = sizeof(struct sctp_sack_info);
6068 
6069 		if (copy_from_user(&params, optval, len))
6070 			return -EFAULT;
6071 	} else if (len == sizeof(struct sctp_assoc_value)) {
6072 		pr_warn_ratelimited(DEPRECATED
6073 				    "%s (pid %d) "
6074 				    "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
6075 				    "Use struct sctp_sack_info instead\n",
6076 				    current->comm, task_pid_nr(current));
6077 		if (copy_from_user(&params, optval, len))
6078 			return -EFAULT;
6079 	} else
6080 		return -EINVAL;
6081 
6082 	/* Get association, if sack_assoc_id != SCTP_FUTURE_ASSOC and the
6083 	 * socket is a one to many style socket, and an association
6084 	 * was not found, then the id was invalid.
6085 	 */
6086 	asoc = sctp_id2assoc(sk, params.sack_assoc_id);
6087 	if (!asoc && params.sack_assoc_id != SCTP_FUTURE_ASSOC &&
6088 	    sctp_style(sk, UDP))
6089 		return -EINVAL;
6090 
6091 	if (asoc) {
6092 		/* Fetch association values. */
6093 		if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
6094 			params.sack_delay = jiffies_to_msecs(asoc->sackdelay);
6095 			params.sack_freq = asoc->sackfreq;
6096 
6097 		} else {
6098 			params.sack_delay = 0;
6099 			params.sack_freq = 1;
6100 		}
6101 	} else {
6102 		/* Fetch socket values. */
6103 		if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
6104 			params.sack_delay  = sp->sackdelay;
6105 			params.sack_freq = sp->sackfreq;
6106 		} else {
6107 			params.sack_delay  = 0;
6108 			params.sack_freq = 1;
6109 		}
6110 	}
6111 
6112 	if (copy_to_user(optval, &params, len))
6113 		return -EFAULT;
6114 
6115 	if (put_user(len, optlen))
6116 		return -EFAULT;
6117 
6118 	return 0;
6119 }
6120 
6121 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
6122  *
6123  * Applications can specify protocol parameters for the default association
6124  * initialization.  The option name argument to setsockopt() and getsockopt()
6125  * is SCTP_INITMSG.
6126  *
6127  * Setting initialization parameters is effective only on an unconnected
6128  * socket (for UDP-style sockets only future associations are effected
6129  * by the change).  With TCP-style sockets, this option is inherited by
6130  * sockets derived from a listener socket.
6131  */
6132 static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
6133 {
6134 	if (len < sizeof(struct sctp_initmsg))
6135 		return -EINVAL;
6136 	len = sizeof(struct sctp_initmsg);
6137 	if (put_user(len, optlen))
6138 		return -EFAULT;
6139 	if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
6140 		return -EFAULT;
6141 	return 0;
6142 }
6143 
6144 
6145 static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
6146 				      char __user *optval, int __user *optlen)
6147 {
6148 	struct sctp_association *asoc;
6149 	int cnt = 0;
6150 	struct sctp_getaddrs getaddrs;
6151 	struct sctp_transport *from;
6152 	void __user *to;
6153 	union sctp_addr temp;
6154 	struct sctp_sock *sp = sctp_sk(sk);
6155 	int addrlen;
6156 	size_t space_left;
6157 	int bytes_copied;
6158 
6159 	if (len < sizeof(struct sctp_getaddrs))
6160 		return -EINVAL;
6161 
6162 	if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
6163 		return -EFAULT;
6164 
6165 	/* For UDP-style sockets, id specifies the association to query.  */
6166 	asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
6167 	if (!asoc)
6168 		return -EINVAL;
6169 
6170 	to = optval + offsetof(struct sctp_getaddrs, addrs);
6171 	space_left = len - offsetof(struct sctp_getaddrs, addrs);
6172 
6173 	list_for_each_entry(from, &asoc->peer.transport_addr_list,
6174 				transports) {
6175 		memcpy(&temp, &from->ipaddr, sizeof(temp));
6176 		addrlen = sctp_get_pf_specific(sk->sk_family)
6177 			      ->addr_to_user(sp, &temp);
6178 		if (space_left < addrlen)
6179 			return -ENOMEM;
6180 		if (copy_to_user(to, &temp, addrlen))
6181 			return -EFAULT;
6182 		to += addrlen;
6183 		cnt++;
6184 		space_left -= addrlen;
6185 	}
6186 
6187 	if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
6188 		return -EFAULT;
6189 	bytes_copied = ((char __user *)to) - optval;
6190 	if (put_user(bytes_copied, optlen))
6191 		return -EFAULT;
6192 
6193 	return 0;
6194 }
6195 
6196 static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
6197 			    size_t space_left, int *bytes_copied)
6198 {
6199 	struct sctp_sockaddr_entry *addr;
6200 	union sctp_addr temp;
6201 	int cnt = 0;
6202 	int addrlen;
6203 	struct net *net = sock_net(sk);
6204 
6205 	rcu_read_lock();
6206 	list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
6207 		if (!addr->valid)
6208 			continue;
6209 
6210 		if ((PF_INET == sk->sk_family) &&
6211 		    (AF_INET6 == addr->a.sa.sa_family))
6212 			continue;
6213 		if ((PF_INET6 == sk->sk_family) &&
6214 		    inet_v6_ipv6only(sk) &&
6215 		    (AF_INET == addr->a.sa.sa_family))
6216 			continue;
6217 		memcpy(&temp, &addr->a, sizeof(temp));
6218 		if (!temp.v4.sin_port)
6219 			temp.v4.sin_port = htons(port);
6220 
6221 		addrlen = sctp_get_pf_specific(sk->sk_family)
6222 			      ->addr_to_user(sctp_sk(sk), &temp);
6223 
6224 		if (space_left < addrlen) {
6225 			cnt =  -ENOMEM;
6226 			break;
6227 		}
6228 		memcpy(to, &temp, addrlen);
6229 
6230 		to += addrlen;
6231 		cnt++;
6232 		space_left -= addrlen;
6233 		*bytes_copied += addrlen;
6234 	}
6235 	rcu_read_unlock();
6236 
6237 	return cnt;
6238 }
6239 
6240 
6241 static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
6242 				       char __user *optval, int __user *optlen)
6243 {
6244 	struct sctp_bind_addr *bp;
6245 	struct sctp_association *asoc;
6246 	int cnt = 0;
6247 	struct sctp_getaddrs getaddrs;
6248 	struct sctp_sockaddr_entry *addr;
6249 	void __user *to;
6250 	union sctp_addr temp;
6251 	struct sctp_sock *sp = sctp_sk(sk);
6252 	int addrlen;
6253 	int err = 0;
6254 	size_t space_left;
6255 	int bytes_copied = 0;
6256 	void *addrs;
6257 	void *buf;
6258 
6259 	if (len < sizeof(struct sctp_getaddrs))
6260 		return -EINVAL;
6261 
6262 	if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
6263 		return -EFAULT;
6264 
6265 	/*
6266 	 *  For UDP-style sockets, id specifies the association to query.
6267 	 *  If the id field is set to the value '0' then the locally bound
6268 	 *  addresses are returned without regard to any particular
6269 	 *  association.
6270 	 */
6271 	if (0 == getaddrs.assoc_id) {
6272 		bp = &sctp_sk(sk)->ep->base.bind_addr;
6273 	} else {
6274 		asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
6275 		if (!asoc)
6276 			return -EINVAL;
6277 		bp = &asoc->base.bind_addr;
6278 	}
6279 
6280 	to = optval + offsetof(struct sctp_getaddrs, addrs);
6281 	space_left = len - offsetof(struct sctp_getaddrs, addrs);
6282 
6283 	addrs = kmalloc(space_left, GFP_USER | __GFP_NOWARN);
6284 	if (!addrs)
6285 		return -ENOMEM;
6286 
6287 	/* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
6288 	 * addresses from the global local address list.
6289 	 */
6290 	if (sctp_list_single_entry(&bp->address_list)) {
6291 		addr = list_entry(bp->address_list.next,
6292 				  struct sctp_sockaddr_entry, list);
6293 		if (sctp_is_any(sk, &addr->a)) {
6294 			cnt = sctp_copy_laddrs(sk, bp->port, addrs,
6295 						space_left, &bytes_copied);
6296 			if (cnt < 0) {
6297 				err = cnt;
6298 				goto out;
6299 			}
6300 			goto copy_getaddrs;
6301 		}
6302 	}
6303 
6304 	buf = addrs;
6305 	/* Protection on the bound address list is not needed since
6306 	 * in the socket option context we hold a socket lock and
6307 	 * thus the bound address list can't change.
6308 	 */
6309 	list_for_each_entry(addr, &bp->address_list, list) {
6310 		memcpy(&temp, &addr->a, sizeof(temp));
6311 		addrlen = sctp_get_pf_specific(sk->sk_family)
6312 			      ->addr_to_user(sp, &temp);
6313 		if (space_left < addrlen) {
6314 			err =  -ENOMEM; /*fixme: right error?*/
6315 			goto out;
6316 		}
6317 		memcpy(buf, &temp, addrlen);
6318 		buf += addrlen;
6319 		bytes_copied += addrlen;
6320 		cnt++;
6321 		space_left -= addrlen;
6322 	}
6323 
6324 copy_getaddrs:
6325 	if (copy_to_user(to, addrs, bytes_copied)) {
6326 		err = -EFAULT;
6327 		goto out;
6328 	}
6329 	if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
6330 		err = -EFAULT;
6331 		goto out;
6332 	}
6333 	/* XXX: We should have accounted for sizeof(struct sctp_getaddrs) too,
6334 	 * but we can't change it anymore.
6335 	 */
6336 	if (put_user(bytes_copied, optlen))
6337 		err = -EFAULT;
6338 out:
6339 	kfree(addrs);
6340 	return err;
6341 }
6342 
6343 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
6344  *
6345  * Requests that the local SCTP stack use the enclosed peer address as
6346  * the association primary.  The enclosed address must be one of the
6347  * association peer's addresses.
6348  */
6349 static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
6350 					char __user *optval, int __user *optlen)
6351 {
6352 	struct sctp_prim prim;
6353 	struct sctp_association *asoc;
6354 	struct sctp_sock *sp = sctp_sk(sk);
6355 
6356 	if (len < sizeof(struct sctp_prim))
6357 		return -EINVAL;
6358 
6359 	len = sizeof(struct sctp_prim);
6360 
6361 	if (copy_from_user(&prim, optval, len))
6362 		return -EFAULT;
6363 
6364 	asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
6365 	if (!asoc)
6366 		return -EINVAL;
6367 
6368 	if (!asoc->peer.primary_path)
6369 		return -ENOTCONN;
6370 
6371 	memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
6372 		asoc->peer.primary_path->af_specific->sockaddr_len);
6373 
6374 	sctp_get_pf_specific(sk->sk_family)->addr_to_user(sp,
6375 			(union sctp_addr *)&prim.ssp_addr);
6376 
6377 	if (put_user(len, optlen))
6378 		return -EFAULT;
6379 	if (copy_to_user(optval, &prim, len))
6380 		return -EFAULT;
6381 
6382 	return 0;
6383 }
6384 
6385 /*
6386  * 7.1.11  Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
6387  *
6388  * Requests that the local endpoint set the specified Adaptation Layer
6389  * Indication parameter for all future INIT and INIT-ACK exchanges.
6390  */
6391 static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
6392 				  char __user *optval, int __user *optlen)
6393 {
6394 	struct sctp_setadaptation adaptation;
6395 
6396 	if (len < sizeof(struct sctp_setadaptation))
6397 		return -EINVAL;
6398 
6399 	len = sizeof(struct sctp_setadaptation);
6400 
6401 	adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
6402 
6403 	if (put_user(len, optlen))
6404 		return -EFAULT;
6405 	if (copy_to_user(optval, &adaptation, len))
6406 		return -EFAULT;
6407 
6408 	return 0;
6409 }
6410 
6411 /*
6412  *
6413  * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
6414  *
6415  *   Applications that wish to use the sendto() system call may wish to
6416  *   specify a default set of parameters that would normally be supplied
6417  *   through the inclusion of ancillary data.  This socket option allows
6418  *   such an application to set the default sctp_sndrcvinfo structure.
6419 
6420 
6421  *   The application that wishes to use this socket option simply passes
6422  *   in to this call the sctp_sndrcvinfo structure defined in Section
6423  *   5.2.2) The input parameters accepted by this call include
6424  *   sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
6425  *   sinfo_timetolive.  The user must provide the sinfo_assoc_id field in
6426  *   to this call if the caller is using the UDP model.
6427  *
6428  *   For getsockopt, it get the default sctp_sndrcvinfo structure.
6429  */
6430 static int sctp_getsockopt_default_send_param(struct sock *sk,
6431 					int len, char __user *optval,
6432 					int __user *optlen)
6433 {
6434 	struct sctp_sock *sp = sctp_sk(sk);
6435 	struct sctp_association *asoc;
6436 	struct sctp_sndrcvinfo info;
6437 
6438 	if (len < sizeof(info))
6439 		return -EINVAL;
6440 
6441 	len = sizeof(info);
6442 
6443 	if (copy_from_user(&info, optval, len))
6444 		return -EFAULT;
6445 
6446 	asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
6447 	if (!asoc && info.sinfo_assoc_id != SCTP_FUTURE_ASSOC &&
6448 	    sctp_style(sk, UDP))
6449 		return -EINVAL;
6450 
6451 	if (asoc) {
6452 		info.sinfo_stream = asoc->default_stream;
6453 		info.sinfo_flags = asoc->default_flags;
6454 		info.sinfo_ppid = asoc->default_ppid;
6455 		info.sinfo_context = asoc->default_context;
6456 		info.sinfo_timetolive = asoc->default_timetolive;
6457 	} else {
6458 		info.sinfo_stream = sp->default_stream;
6459 		info.sinfo_flags = sp->default_flags;
6460 		info.sinfo_ppid = sp->default_ppid;
6461 		info.sinfo_context = sp->default_context;
6462 		info.sinfo_timetolive = sp->default_timetolive;
6463 	}
6464 
6465 	if (put_user(len, optlen))
6466 		return -EFAULT;
6467 	if (copy_to_user(optval, &info, len))
6468 		return -EFAULT;
6469 
6470 	return 0;
6471 }
6472 
6473 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
6474  * (SCTP_DEFAULT_SNDINFO)
6475  */
6476 static int sctp_getsockopt_default_sndinfo(struct sock *sk, int len,
6477 					   char __user *optval,
6478 					   int __user *optlen)
6479 {
6480 	struct sctp_sock *sp = sctp_sk(sk);
6481 	struct sctp_association *asoc;
6482 	struct sctp_sndinfo info;
6483 
6484 	if (len < sizeof(info))
6485 		return -EINVAL;
6486 
6487 	len = sizeof(info);
6488 
6489 	if (copy_from_user(&info, optval, len))
6490 		return -EFAULT;
6491 
6492 	asoc = sctp_id2assoc(sk, info.snd_assoc_id);
6493 	if (!asoc && info.snd_assoc_id != SCTP_FUTURE_ASSOC &&
6494 	    sctp_style(sk, UDP))
6495 		return -EINVAL;
6496 
6497 	if (asoc) {
6498 		info.snd_sid = asoc->default_stream;
6499 		info.snd_flags = asoc->default_flags;
6500 		info.snd_ppid = asoc->default_ppid;
6501 		info.snd_context = asoc->default_context;
6502 	} else {
6503 		info.snd_sid = sp->default_stream;
6504 		info.snd_flags = sp->default_flags;
6505 		info.snd_ppid = sp->default_ppid;
6506 		info.snd_context = sp->default_context;
6507 	}
6508 
6509 	if (put_user(len, optlen))
6510 		return -EFAULT;
6511 	if (copy_to_user(optval, &info, len))
6512 		return -EFAULT;
6513 
6514 	return 0;
6515 }
6516 
6517 /*
6518  *
6519  * 7.1.5 SCTP_NODELAY
6520  *
6521  * Turn on/off any Nagle-like algorithm.  This means that packets are
6522  * generally sent as soon as possible and no unnecessary delays are
6523  * introduced, at the cost of more packets in the network.  Expects an
6524  * integer boolean flag.
6525  */
6526 
6527 static int sctp_getsockopt_nodelay(struct sock *sk, int len,
6528 				   char __user *optval, int __user *optlen)
6529 {
6530 	int val;
6531 
6532 	if (len < sizeof(int))
6533 		return -EINVAL;
6534 
6535 	len = sizeof(int);
6536 	val = (sctp_sk(sk)->nodelay == 1);
6537 	if (put_user(len, optlen))
6538 		return -EFAULT;
6539 	if (copy_to_user(optval, &val, len))
6540 		return -EFAULT;
6541 	return 0;
6542 }
6543 
6544 /*
6545  *
6546  * 7.1.1 SCTP_RTOINFO
6547  *
6548  * The protocol parameters used to initialize and bound retransmission
6549  * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
6550  * and modify these parameters.
6551  * All parameters are time values, in milliseconds.  A value of 0, when
6552  * modifying the parameters, indicates that the current value should not
6553  * be changed.
6554  *
6555  */
6556 static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
6557 				char __user *optval,
6558 				int __user *optlen) {
6559 	struct sctp_rtoinfo rtoinfo;
6560 	struct sctp_association *asoc;
6561 
6562 	if (len < sizeof (struct sctp_rtoinfo))
6563 		return -EINVAL;
6564 
6565 	len = sizeof(struct sctp_rtoinfo);
6566 
6567 	if (copy_from_user(&rtoinfo, optval, len))
6568 		return -EFAULT;
6569 
6570 	asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
6571 
6572 	if (!asoc && rtoinfo.srto_assoc_id != SCTP_FUTURE_ASSOC &&
6573 	    sctp_style(sk, UDP))
6574 		return -EINVAL;
6575 
6576 	/* Values corresponding to the specific association. */
6577 	if (asoc) {
6578 		rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
6579 		rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
6580 		rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
6581 	} else {
6582 		/* Values corresponding to the endpoint. */
6583 		struct sctp_sock *sp = sctp_sk(sk);
6584 
6585 		rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
6586 		rtoinfo.srto_max = sp->rtoinfo.srto_max;
6587 		rtoinfo.srto_min = sp->rtoinfo.srto_min;
6588 	}
6589 
6590 	if (put_user(len, optlen))
6591 		return -EFAULT;
6592 
6593 	if (copy_to_user(optval, &rtoinfo, len))
6594 		return -EFAULT;
6595 
6596 	return 0;
6597 }
6598 
6599 /*
6600  *
6601  * 7.1.2 SCTP_ASSOCINFO
6602  *
6603  * This option is used to tune the maximum retransmission attempts
6604  * of the association.
6605  * Returns an error if the new association retransmission value is
6606  * greater than the sum of the retransmission value  of the peer.
6607  * See [SCTP] for more information.
6608  *
6609  */
6610 static int sctp_getsockopt_associnfo(struct sock *sk, int len,
6611 				     char __user *optval,
6612 				     int __user *optlen)
6613 {
6614 
6615 	struct sctp_assocparams assocparams;
6616 	struct sctp_association *asoc;
6617 	struct list_head *pos;
6618 	int cnt = 0;
6619 
6620 	if (len < sizeof (struct sctp_assocparams))
6621 		return -EINVAL;
6622 
6623 	len = sizeof(struct sctp_assocparams);
6624 
6625 	if (copy_from_user(&assocparams, optval, len))
6626 		return -EFAULT;
6627 
6628 	asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
6629 
6630 	if (!asoc && assocparams.sasoc_assoc_id != SCTP_FUTURE_ASSOC &&
6631 	    sctp_style(sk, UDP))
6632 		return -EINVAL;
6633 
6634 	/* Values correspoinding to the specific association */
6635 	if (asoc) {
6636 		assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
6637 		assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
6638 		assocparams.sasoc_local_rwnd = asoc->a_rwnd;
6639 		assocparams.sasoc_cookie_life = ktime_to_ms(asoc->cookie_life);
6640 
6641 		list_for_each(pos, &asoc->peer.transport_addr_list) {
6642 			cnt++;
6643 		}
6644 
6645 		assocparams.sasoc_number_peer_destinations = cnt;
6646 	} else {
6647 		/* Values corresponding to the endpoint */
6648 		struct sctp_sock *sp = sctp_sk(sk);
6649 
6650 		assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
6651 		assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
6652 		assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
6653 		assocparams.sasoc_cookie_life =
6654 					sp->assocparams.sasoc_cookie_life;
6655 		assocparams.sasoc_number_peer_destinations =
6656 					sp->assocparams.
6657 					sasoc_number_peer_destinations;
6658 	}
6659 
6660 	if (put_user(len, optlen))
6661 		return -EFAULT;
6662 
6663 	if (copy_to_user(optval, &assocparams, len))
6664 		return -EFAULT;
6665 
6666 	return 0;
6667 }
6668 
6669 /*
6670  * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
6671  *
6672  * This socket option is a boolean flag which turns on or off mapped V4
6673  * addresses.  If this option is turned on and the socket is type
6674  * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
6675  * If this option is turned off, then no mapping will be done of V4
6676  * addresses and a user will receive both PF_INET6 and PF_INET type
6677  * addresses on the socket.
6678  */
6679 static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
6680 				    char __user *optval, int __user *optlen)
6681 {
6682 	int val;
6683 	struct sctp_sock *sp = sctp_sk(sk);
6684 
6685 	if (len < sizeof(int))
6686 		return -EINVAL;
6687 
6688 	len = sizeof(int);
6689 	val = sp->v4mapped;
6690 	if (put_user(len, optlen))
6691 		return -EFAULT;
6692 	if (copy_to_user(optval, &val, len))
6693 		return -EFAULT;
6694 
6695 	return 0;
6696 }
6697 
6698 /*
6699  * 7.1.29.  Set or Get the default context (SCTP_CONTEXT)
6700  * (chapter and verse is quoted at sctp_setsockopt_context())
6701  */
6702 static int sctp_getsockopt_context(struct sock *sk, int len,
6703 				   char __user *optval, int __user *optlen)
6704 {
6705 	struct sctp_assoc_value params;
6706 	struct sctp_association *asoc;
6707 
6708 	if (len < sizeof(struct sctp_assoc_value))
6709 		return -EINVAL;
6710 
6711 	len = sizeof(struct sctp_assoc_value);
6712 
6713 	if (copy_from_user(&params, optval, len))
6714 		return -EFAULT;
6715 
6716 	asoc = sctp_id2assoc(sk, params.assoc_id);
6717 	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6718 	    sctp_style(sk, UDP))
6719 		return -EINVAL;
6720 
6721 	params.assoc_value = asoc ? asoc->default_rcv_context
6722 				  : sctp_sk(sk)->default_rcv_context;
6723 
6724 	if (put_user(len, optlen))
6725 		return -EFAULT;
6726 	if (copy_to_user(optval, &params, len))
6727 		return -EFAULT;
6728 
6729 	return 0;
6730 }
6731 
6732 /*
6733  * 8.1.16.  Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
6734  * This option will get or set the maximum size to put in any outgoing
6735  * SCTP DATA chunk.  If a message is larger than this size it will be
6736  * fragmented by SCTP into the specified size.  Note that the underlying
6737  * SCTP implementation may fragment into smaller sized chunks when the
6738  * PMTU of the underlying association is smaller than the value set by
6739  * the user.  The default value for this option is '0' which indicates
6740  * the user is NOT limiting fragmentation and only the PMTU will effect
6741  * SCTP's choice of DATA chunk size.  Note also that values set larger
6742  * than the maximum size of an IP datagram will effectively let SCTP
6743  * control fragmentation (i.e. the same as setting this option to 0).
6744  *
6745  * The following structure is used to access and modify this parameter:
6746  *
6747  * struct sctp_assoc_value {
6748  *   sctp_assoc_t assoc_id;
6749  *   uint32_t assoc_value;
6750  * };
6751  *
6752  * assoc_id:  This parameter is ignored for one-to-one style sockets.
6753  *    For one-to-many style sockets this parameter indicates which
6754  *    association the user is performing an action upon.  Note that if
6755  *    this field's value is zero then the endpoints default value is
6756  *    changed (effecting future associations only).
6757  * assoc_value:  This parameter specifies the maximum size in bytes.
6758  */
6759 static int sctp_getsockopt_maxseg(struct sock *sk, int len,
6760 				  char __user *optval, int __user *optlen)
6761 {
6762 	struct sctp_assoc_value params;
6763 	struct sctp_association *asoc;
6764 
6765 	if (len == sizeof(int)) {
6766 		pr_warn_ratelimited(DEPRECATED
6767 				    "%s (pid %d) "
6768 				    "Use of int in maxseg socket option.\n"
6769 				    "Use struct sctp_assoc_value instead\n",
6770 				    current->comm, task_pid_nr(current));
6771 		params.assoc_id = SCTP_FUTURE_ASSOC;
6772 	} else if (len >= sizeof(struct sctp_assoc_value)) {
6773 		len = sizeof(struct sctp_assoc_value);
6774 		if (copy_from_user(&params, optval, len))
6775 			return -EFAULT;
6776 	} else
6777 		return -EINVAL;
6778 
6779 	asoc = sctp_id2assoc(sk, params.assoc_id);
6780 	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6781 	    sctp_style(sk, UDP))
6782 		return -EINVAL;
6783 
6784 	if (asoc)
6785 		params.assoc_value = asoc->frag_point;
6786 	else
6787 		params.assoc_value = sctp_sk(sk)->user_frag;
6788 
6789 	if (put_user(len, optlen))
6790 		return -EFAULT;
6791 	if (len == sizeof(int)) {
6792 		if (copy_to_user(optval, &params.assoc_value, len))
6793 			return -EFAULT;
6794 	} else {
6795 		if (copy_to_user(optval, &params, len))
6796 			return -EFAULT;
6797 	}
6798 
6799 	return 0;
6800 }
6801 
6802 /*
6803  * 7.1.24.  Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
6804  * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
6805  */
6806 static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
6807 					       char __user *optval, int __user *optlen)
6808 {
6809 	int val;
6810 
6811 	if (len < sizeof(int))
6812 		return -EINVAL;
6813 
6814 	len = sizeof(int);
6815 
6816 	val = sctp_sk(sk)->frag_interleave;
6817 	if (put_user(len, optlen))
6818 		return -EFAULT;
6819 	if (copy_to_user(optval, &val, len))
6820 		return -EFAULT;
6821 
6822 	return 0;
6823 }
6824 
6825 /*
6826  * 7.1.25.  Set or Get the sctp partial delivery point
6827  * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
6828  */
6829 static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
6830 						  char __user *optval,
6831 						  int __user *optlen)
6832 {
6833 	u32 val;
6834 
6835 	if (len < sizeof(u32))
6836 		return -EINVAL;
6837 
6838 	len = sizeof(u32);
6839 
6840 	val = sctp_sk(sk)->pd_point;
6841 	if (put_user(len, optlen))
6842 		return -EFAULT;
6843 	if (copy_to_user(optval, &val, len))
6844 		return -EFAULT;
6845 
6846 	return 0;
6847 }
6848 
6849 /*
6850  * 7.1.28.  Set or Get the maximum burst (SCTP_MAX_BURST)
6851  * (chapter and verse is quoted at sctp_setsockopt_maxburst())
6852  */
6853 static int sctp_getsockopt_maxburst(struct sock *sk, int len,
6854 				    char __user *optval,
6855 				    int __user *optlen)
6856 {
6857 	struct sctp_assoc_value params;
6858 	struct sctp_association *asoc;
6859 
6860 	if (len == sizeof(int)) {
6861 		pr_warn_ratelimited(DEPRECATED
6862 				    "%s (pid %d) "
6863 				    "Use of int in max_burst socket option.\n"
6864 				    "Use struct sctp_assoc_value instead\n",
6865 				    current->comm, task_pid_nr(current));
6866 		params.assoc_id = SCTP_FUTURE_ASSOC;
6867 	} else if (len >= sizeof(struct sctp_assoc_value)) {
6868 		len = sizeof(struct sctp_assoc_value);
6869 		if (copy_from_user(&params, optval, len))
6870 			return -EFAULT;
6871 	} else
6872 		return -EINVAL;
6873 
6874 	asoc = sctp_id2assoc(sk, params.assoc_id);
6875 	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6876 	    sctp_style(sk, UDP))
6877 		return -EINVAL;
6878 
6879 	params.assoc_value = asoc ? asoc->max_burst : sctp_sk(sk)->max_burst;
6880 
6881 	if (len == sizeof(int)) {
6882 		if (copy_to_user(optval, &params.assoc_value, len))
6883 			return -EFAULT;
6884 	} else {
6885 		if (copy_to_user(optval, &params, len))
6886 			return -EFAULT;
6887 	}
6888 
6889 	return 0;
6890 
6891 }
6892 
6893 static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
6894 				    char __user *optval, int __user *optlen)
6895 {
6896 	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6897 	struct sctp_hmacalgo  __user *p = (void __user *)optval;
6898 	struct sctp_hmac_algo_param *hmacs;
6899 	__u16 data_len = 0;
6900 	u32 num_idents;
6901 	int i;
6902 
6903 	if (!ep->auth_enable)
6904 		return -EACCES;
6905 
6906 	hmacs = ep->auth_hmacs_list;
6907 	data_len = ntohs(hmacs->param_hdr.length) -
6908 		   sizeof(struct sctp_paramhdr);
6909 
6910 	if (len < sizeof(struct sctp_hmacalgo) + data_len)
6911 		return -EINVAL;
6912 
6913 	len = sizeof(struct sctp_hmacalgo) + data_len;
6914 	num_idents = data_len / sizeof(u16);
6915 
6916 	if (put_user(len, optlen))
6917 		return -EFAULT;
6918 	if (put_user(num_idents, &p->shmac_num_idents))
6919 		return -EFAULT;
6920 	for (i = 0; i < num_idents; i++) {
6921 		__u16 hmacid = ntohs(hmacs->hmac_ids[i]);
6922 
6923 		if (copy_to_user(&p->shmac_idents[i], &hmacid, sizeof(__u16)))
6924 			return -EFAULT;
6925 	}
6926 	return 0;
6927 }
6928 
6929 static int sctp_getsockopt_active_key(struct sock *sk, int len,
6930 				    char __user *optval, int __user *optlen)
6931 {
6932 	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6933 	struct sctp_authkeyid val;
6934 	struct sctp_association *asoc;
6935 
6936 	if (len < sizeof(struct sctp_authkeyid))
6937 		return -EINVAL;
6938 
6939 	len = sizeof(struct sctp_authkeyid);
6940 	if (copy_from_user(&val, optval, len))
6941 		return -EFAULT;
6942 
6943 	asoc = sctp_id2assoc(sk, val.scact_assoc_id);
6944 	if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
6945 		return -EINVAL;
6946 
6947 	if (asoc) {
6948 		if (!asoc->peer.auth_capable)
6949 			return -EACCES;
6950 		val.scact_keynumber = asoc->active_key_id;
6951 	} else {
6952 		if (!ep->auth_enable)
6953 			return -EACCES;
6954 		val.scact_keynumber = ep->active_key_id;
6955 	}
6956 
6957 	if (put_user(len, optlen))
6958 		return -EFAULT;
6959 	if (copy_to_user(optval, &val, len))
6960 		return -EFAULT;
6961 
6962 	return 0;
6963 }
6964 
6965 static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
6966 				    char __user *optval, int __user *optlen)
6967 {
6968 	struct sctp_authchunks __user *p = (void __user *)optval;
6969 	struct sctp_authchunks val;
6970 	struct sctp_association *asoc;
6971 	struct sctp_chunks_param *ch;
6972 	u32    num_chunks = 0;
6973 	char __user *to;
6974 
6975 	if (len < sizeof(struct sctp_authchunks))
6976 		return -EINVAL;
6977 
6978 	if (copy_from_user(&val, optval, sizeof(val)))
6979 		return -EFAULT;
6980 
6981 	to = p->gauth_chunks;
6982 	asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
6983 	if (!asoc)
6984 		return -EINVAL;
6985 
6986 	if (!asoc->peer.auth_capable)
6987 		return -EACCES;
6988 
6989 	ch = asoc->peer.peer_chunks;
6990 	if (!ch)
6991 		goto num;
6992 
6993 	/* See if the user provided enough room for all the data */
6994 	num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
6995 	if (len < num_chunks)
6996 		return -EINVAL;
6997 
6998 	if (copy_to_user(to, ch->chunks, num_chunks))
6999 		return -EFAULT;
7000 num:
7001 	len = sizeof(struct sctp_authchunks) + num_chunks;
7002 	if (put_user(len, optlen))
7003 		return -EFAULT;
7004 	if (put_user(num_chunks, &p->gauth_number_of_chunks))
7005 		return -EFAULT;
7006 	return 0;
7007 }
7008 
7009 static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
7010 				    char __user *optval, int __user *optlen)
7011 {
7012 	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
7013 	struct sctp_authchunks __user *p = (void __user *)optval;
7014 	struct sctp_authchunks val;
7015 	struct sctp_association *asoc;
7016 	struct sctp_chunks_param *ch;
7017 	u32    num_chunks = 0;
7018 	char __user *to;
7019 
7020 	if (len < sizeof(struct sctp_authchunks))
7021 		return -EINVAL;
7022 
7023 	if (copy_from_user(&val, optval, sizeof(val)))
7024 		return -EFAULT;
7025 
7026 	to = p->gauth_chunks;
7027 	asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
7028 	if (!asoc && val.gauth_assoc_id != SCTP_FUTURE_ASSOC &&
7029 	    sctp_style(sk, UDP))
7030 		return -EINVAL;
7031 
7032 	if (asoc) {
7033 		if (!asoc->peer.auth_capable)
7034 			return -EACCES;
7035 		ch = (struct sctp_chunks_param *)asoc->c.auth_chunks;
7036 	} else {
7037 		if (!ep->auth_enable)
7038 			return -EACCES;
7039 		ch = ep->auth_chunk_list;
7040 	}
7041 	if (!ch)
7042 		goto num;
7043 
7044 	num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
7045 	if (len < sizeof(struct sctp_authchunks) + num_chunks)
7046 		return -EINVAL;
7047 
7048 	if (copy_to_user(to, ch->chunks, num_chunks))
7049 		return -EFAULT;
7050 num:
7051 	len = sizeof(struct sctp_authchunks) + num_chunks;
7052 	if (put_user(len, optlen))
7053 		return -EFAULT;
7054 	if (put_user(num_chunks, &p->gauth_number_of_chunks))
7055 		return -EFAULT;
7056 
7057 	return 0;
7058 }
7059 
7060 /*
7061  * 8.2.5.  Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
7062  * This option gets the current number of associations that are attached
7063  * to a one-to-many style socket.  The option value is an uint32_t.
7064  */
7065 static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
7066 				    char __user *optval, int __user *optlen)
7067 {
7068 	struct sctp_sock *sp = sctp_sk(sk);
7069 	struct sctp_association *asoc;
7070 	u32 val = 0;
7071 
7072 	if (sctp_style(sk, TCP))
7073 		return -EOPNOTSUPP;
7074 
7075 	if (len < sizeof(u32))
7076 		return -EINVAL;
7077 
7078 	len = sizeof(u32);
7079 
7080 	list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
7081 		val++;
7082 	}
7083 
7084 	if (put_user(len, optlen))
7085 		return -EFAULT;
7086 	if (copy_to_user(optval, &val, len))
7087 		return -EFAULT;
7088 
7089 	return 0;
7090 }
7091 
7092 /*
7093  * 8.1.23 SCTP_AUTO_ASCONF
7094  * See the corresponding setsockopt entry as description
7095  */
7096 static int sctp_getsockopt_auto_asconf(struct sock *sk, int len,
7097 				   char __user *optval, int __user *optlen)
7098 {
7099 	int val = 0;
7100 
7101 	if (len < sizeof(int))
7102 		return -EINVAL;
7103 
7104 	len = sizeof(int);
7105 	if (sctp_sk(sk)->do_auto_asconf && sctp_is_ep_boundall(sk))
7106 		val = 1;
7107 	if (put_user(len, optlen))
7108 		return -EFAULT;
7109 	if (copy_to_user(optval, &val, len))
7110 		return -EFAULT;
7111 	return 0;
7112 }
7113 
7114 /*
7115  * 8.2.6. Get the Current Identifiers of Associations
7116  *        (SCTP_GET_ASSOC_ID_LIST)
7117  *
7118  * This option gets the current list of SCTP association identifiers of
7119  * the SCTP associations handled by a one-to-many style socket.
7120  */
7121 static int sctp_getsockopt_assoc_ids(struct sock *sk, int len,
7122 				    char __user *optval, int __user *optlen)
7123 {
7124 	struct sctp_sock *sp = sctp_sk(sk);
7125 	struct sctp_association *asoc;
7126 	struct sctp_assoc_ids *ids;
7127 	size_t ids_size;
7128 	u32 num = 0;
7129 
7130 	if (sctp_style(sk, TCP))
7131 		return -EOPNOTSUPP;
7132 
7133 	if (len < sizeof(struct sctp_assoc_ids))
7134 		return -EINVAL;
7135 
7136 	list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
7137 		num++;
7138 	}
7139 
7140 	ids_size = struct_size(ids, gaids_assoc_id, num);
7141 	if (len < ids_size)
7142 		return -EINVAL;
7143 
7144 	len = ids_size;
7145 	ids = kmalloc(len, GFP_USER | __GFP_NOWARN);
7146 	if (unlikely(!ids))
7147 		return -ENOMEM;
7148 
7149 	ids->gaids_number_of_ids = num;
7150 	num = 0;
7151 	list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
7152 		ids->gaids_assoc_id[num++] = asoc->assoc_id;
7153 	}
7154 
7155 	if (put_user(len, optlen) || copy_to_user(optval, ids, len)) {
7156 		kfree(ids);
7157 		return -EFAULT;
7158 	}
7159 
7160 	kfree(ids);
7161 	return 0;
7162 }
7163 
7164 /*
7165  * SCTP_PEER_ADDR_THLDS
7166  *
7167  * This option allows us to fetch the partially failed threshold for one or all
7168  * transports in an association.  See Section 6.1 of:
7169  * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
7170  */
7171 static int sctp_getsockopt_paddr_thresholds(struct sock *sk,
7172 					    char __user *optval, int len,
7173 					    int __user *optlen, bool v2)
7174 {
7175 	struct sctp_paddrthlds_v2 val;
7176 	struct sctp_transport *trans;
7177 	struct sctp_association *asoc;
7178 	int min;
7179 
7180 	min = v2 ? sizeof(val) : sizeof(struct sctp_paddrthlds);
7181 	if (len < min)
7182 		return -EINVAL;
7183 	len = min;
7184 	if (copy_from_user(&val, optval, len))
7185 		return -EFAULT;
7186 
7187 	if (!sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
7188 		trans = sctp_addr_id2transport(sk, &val.spt_address,
7189 					       val.spt_assoc_id);
7190 		if (!trans)
7191 			return -ENOENT;
7192 
7193 		val.spt_pathmaxrxt = trans->pathmaxrxt;
7194 		val.spt_pathpfthld = trans->pf_retrans;
7195 		val.spt_pathcpthld = trans->ps_retrans;
7196 
7197 		goto out;
7198 	}
7199 
7200 	asoc = sctp_id2assoc(sk, val.spt_assoc_id);
7201 	if (!asoc && val.spt_assoc_id != SCTP_FUTURE_ASSOC &&
7202 	    sctp_style(sk, UDP))
7203 		return -EINVAL;
7204 
7205 	if (asoc) {
7206 		val.spt_pathpfthld = asoc->pf_retrans;
7207 		val.spt_pathmaxrxt = asoc->pathmaxrxt;
7208 		val.spt_pathcpthld = asoc->ps_retrans;
7209 	} else {
7210 		struct sctp_sock *sp = sctp_sk(sk);
7211 
7212 		val.spt_pathpfthld = sp->pf_retrans;
7213 		val.spt_pathmaxrxt = sp->pathmaxrxt;
7214 		val.spt_pathcpthld = sp->ps_retrans;
7215 	}
7216 
7217 out:
7218 	if (put_user(len, optlen) || copy_to_user(optval, &val, len))
7219 		return -EFAULT;
7220 
7221 	return 0;
7222 }
7223 
7224 /*
7225  * SCTP_GET_ASSOC_STATS
7226  *
7227  * This option retrieves local per endpoint statistics. It is modeled
7228  * after OpenSolaris' implementation
7229  */
7230 static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
7231 				       char __user *optval,
7232 				       int __user *optlen)
7233 {
7234 	struct sctp_assoc_stats sas;
7235 	struct sctp_association *asoc = NULL;
7236 
7237 	/* User must provide at least the assoc id */
7238 	if (len < sizeof(sctp_assoc_t))
7239 		return -EINVAL;
7240 
7241 	/* Allow the struct to grow and fill in as much as possible */
7242 	len = min_t(size_t, len, sizeof(sas));
7243 
7244 	if (copy_from_user(&sas, optval, len))
7245 		return -EFAULT;
7246 
7247 	asoc = sctp_id2assoc(sk, sas.sas_assoc_id);
7248 	if (!asoc)
7249 		return -EINVAL;
7250 
7251 	sas.sas_rtxchunks = asoc->stats.rtxchunks;
7252 	sas.sas_gapcnt = asoc->stats.gapcnt;
7253 	sas.sas_outofseqtsns = asoc->stats.outofseqtsns;
7254 	sas.sas_osacks = asoc->stats.osacks;
7255 	sas.sas_isacks = asoc->stats.isacks;
7256 	sas.sas_octrlchunks = asoc->stats.octrlchunks;
7257 	sas.sas_ictrlchunks = asoc->stats.ictrlchunks;
7258 	sas.sas_oodchunks = asoc->stats.oodchunks;
7259 	sas.sas_iodchunks = asoc->stats.iodchunks;
7260 	sas.sas_ouodchunks = asoc->stats.ouodchunks;
7261 	sas.sas_iuodchunks = asoc->stats.iuodchunks;
7262 	sas.sas_idupchunks = asoc->stats.idupchunks;
7263 	sas.sas_opackets = asoc->stats.opackets;
7264 	sas.sas_ipackets = asoc->stats.ipackets;
7265 
7266 	/* New high max rto observed, will return 0 if not a single
7267 	 * RTO update took place. obs_rto_ipaddr will be bogus
7268 	 * in such a case
7269 	 */
7270 	sas.sas_maxrto = asoc->stats.max_obs_rto;
7271 	memcpy(&sas.sas_obs_rto_ipaddr, &asoc->stats.obs_rto_ipaddr,
7272 		sizeof(struct sockaddr_storage));
7273 
7274 	/* Mark beginning of a new observation period */
7275 	asoc->stats.max_obs_rto = asoc->rto_min;
7276 
7277 	if (put_user(len, optlen))
7278 		return -EFAULT;
7279 
7280 	pr_debug("%s: len:%d, assoc_id:%d\n", __func__, len, sas.sas_assoc_id);
7281 
7282 	if (copy_to_user(optval, &sas, len))
7283 		return -EFAULT;
7284 
7285 	return 0;
7286 }
7287 
7288 static int sctp_getsockopt_recvrcvinfo(struct sock *sk,	int len,
7289 				       char __user *optval,
7290 				       int __user *optlen)
7291 {
7292 	int val = 0;
7293 
7294 	if (len < sizeof(int))
7295 		return -EINVAL;
7296 
7297 	len = sizeof(int);
7298 	if (sctp_sk(sk)->recvrcvinfo)
7299 		val = 1;
7300 	if (put_user(len, optlen))
7301 		return -EFAULT;
7302 	if (copy_to_user(optval, &val, len))
7303 		return -EFAULT;
7304 
7305 	return 0;
7306 }
7307 
7308 static int sctp_getsockopt_recvnxtinfo(struct sock *sk,	int len,
7309 				       char __user *optval,
7310 				       int __user *optlen)
7311 {
7312 	int val = 0;
7313 
7314 	if (len < sizeof(int))
7315 		return -EINVAL;
7316 
7317 	len = sizeof(int);
7318 	if (sctp_sk(sk)->recvnxtinfo)
7319 		val = 1;
7320 	if (put_user(len, optlen))
7321 		return -EFAULT;
7322 	if (copy_to_user(optval, &val, len))
7323 		return -EFAULT;
7324 
7325 	return 0;
7326 }
7327 
7328 static int sctp_getsockopt_pr_supported(struct sock *sk, int len,
7329 					char __user *optval,
7330 					int __user *optlen)
7331 {
7332 	struct sctp_assoc_value params;
7333 	struct sctp_association *asoc;
7334 	int retval = -EFAULT;
7335 
7336 	if (len < sizeof(params)) {
7337 		retval = -EINVAL;
7338 		goto out;
7339 	}
7340 
7341 	len = sizeof(params);
7342 	if (copy_from_user(&params, optval, len))
7343 		goto out;
7344 
7345 	asoc = sctp_id2assoc(sk, params.assoc_id);
7346 	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7347 	    sctp_style(sk, UDP)) {
7348 		retval = -EINVAL;
7349 		goto out;
7350 	}
7351 
7352 	params.assoc_value = asoc ? asoc->peer.prsctp_capable
7353 				  : sctp_sk(sk)->ep->prsctp_enable;
7354 
7355 	if (put_user(len, optlen))
7356 		goto out;
7357 
7358 	if (copy_to_user(optval, &params, len))
7359 		goto out;
7360 
7361 	retval = 0;
7362 
7363 out:
7364 	return retval;
7365 }
7366 
7367 static int sctp_getsockopt_default_prinfo(struct sock *sk, int len,
7368 					  char __user *optval,
7369 					  int __user *optlen)
7370 {
7371 	struct sctp_default_prinfo info;
7372 	struct sctp_association *asoc;
7373 	int retval = -EFAULT;
7374 
7375 	if (len < sizeof(info)) {
7376 		retval = -EINVAL;
7377 		goto out;
7378 	}
7379 
7380 	len = sizeof(info);
7381 	if (copy_from_user(&info, optval, len))
7382 		goto out;
7383 
7384 	asoc = sctp_id2assoc(sk, info.pr_assoc_id);
7385 	if (!asoc && info.pr_assoc_id != SCTP_FUTURE_ASSOC &&
7386 	    sctp_style(sk, UDP)) {
7387 		retval = -EINVAL;
7388 		goto out;
7389 	}
7390 
7391 	if (asoc) {
7392 		info.pr_policy = SCTP_PR_POLICY(asoc->default_flags);
7393 		info.pr_value = asoc->default_timetolive;
7394 	} else {
7395 		struct sctp_sock *sp = sctp_sk(sk);
7396 
7397 		info.pr_policy = SCTP_PR_POLICY(sp->default_flags);
7398 		info.pr_value = sp->default_timetolive;
7399 	}
7400 
7401 	if (put_user(len, optlen))
7402 		goto out;
7403 
7404 	if (copy_to_user(optval, &info, len))
7405 		goto out;
7406 
7407 	retval = 0;
7408 
7409 out:
7410 	return retval;
7411 }
7412 
7413 static int sctp_getsockopt_pr_assocstatus(struct sock *sk, int len,
7414 					  char __user *optval,
7415 					  int __user *optlen)
7416 {
7417 	struct sctp_prstatus params;
7418 	struct sctp_association *asoc;
7419 	int policy;
7420 	int retval = -EINVAL;
7421 
7422 	if (len < sizeof(params))
7423 		goto out;
7424 
7425 	len = sizeof(params);
7426 	if (copy_from_user(&params, optval, len)) {
7427 		retval = -EFAULT;
7428 		goto out;
7429 	}
7430 
7431 	policy = params.sprstat_policy;
7432 	if (!policy || (policy & ~(SCTP_PR_SCTP_MASK | SCTP_PR_SCTP_ALL)) ||
7433 	    ((policy & SCTP_PR_SCTP_ALL) && (policy & SCTP_PR_SCTP_MASK)))
7434 		goto out;
7435 
7436 	asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
7437 	if (!asoc)
7438 		goto out;
7439 
7440 	if (policy == SCTP_PR_SCTP_ALL) {
7441 		params.sprstat_abandoned_unsent = 0;
7442 		params.sprstat_abandoned_sent = 0;
7443 		for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
7444 			params.sprstat_abandoned_unsent +=
7445 				asoc->abandoned_unsent[policy];
7446 			params.sprstat_abandoned_sent +=
7447 				asoc->abandoned_sent[policy];
7448 		}
7449 	} else {
7450 		params.sprstat_abandoned_unsent =
7451 			asoc->abandoned_unsent[__SCTP_PR_INDEX(policy)];
7452 		params.sprstat_abandoned_sent =
7453 			asoc->abandoned_sent[__SCTP_PR_INDEX(policy)];
7454 	}
7455 
7456 	if (put_user(len, optlen)) {
7457 		retval = -EFAULT;
7458 		goto out;
7459 	}
7460 
7461 	if (copy_to_user(optval, &params, len)) {
7462 		retval = -EFAULT;
7463 		goto out;
7464 	}
7465 
7466 	retval = 0;
7467 
7468 out:
7469 	return retval;
7470 }
7471 
7472 static int sctp_getsockopt_pr_streamstatus(struct sock *sk, int len,
7473 					   char __user *optval,
7474 					   int __user *optlen)
7475 {
7476 	struct sctp_stream_out_ext *streamoute;
7477 	struct sctp_association *asoc;
7478 	struct sctp_prstatus params;
7479 	int retval = -EINVAL;
7480 	int policy;
7481 
7482 	if (len < sizeof(params))
7483 		goto out;
7484 
7485 	len = sizeof(params);
7486 	if (copy_from_user(&params, optval, len)) {
7487 		retval = -EFAULT;
7488 		goto out;
7489 	}
7490 
7491 	policy = params.sprstat_policy;
7492 	if (!policy || (policy & ~(SCTP_PR_SCTP_MASK | SCTP_PR_SCTP_ALL)) ||
7493 	    ((policy & SCTP_PR_SCTP_ALL) && (policy & SCTP_PR_SCTP_MASK)))
7494 		goto out;
7495 
7496 	asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
7497 	if (!asoc || params.sprstat_sid >= asoc->stream.outcnt)
7498 		goto out;
7499 
7500 	streamoute = SCTP_SO(&asoc->stream, params.sprstat_sid)->ext;
7501 	if (!streamoute) {
7502 		/* Not allocated yet, means all stats are 0 */
7503 		params.sprstat_abandoned_unsent = 0;
7504 		params.sprstat_abandoned_sent = 0;
7505 		retval = 0;
7506 		goto out;
7507 	}
7508 
7509 	if (policy == SCTP_PR_SCTP_ALL) {
7510 		params.sprstat_abandoned_unsent = 0;
7511 		params.sprstat_abandoned_sent = 0;
7512 		for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
7513 			params.sprstat_abandoned_unsent +=
7514 				streamoute->abandoned_unsent[policy];
7515 			params.sprstat_abandoned_sent +=
7516 				streamoute->abandoned_sent[policy];
7517 		}
7518 	} else {
7519 		params.sprstat_abandoned_unsent =
7520 			streamoute->abandoned_unsent[__SCTP_PR_INDEX(policy)];
7521 		params.sprstat_abandoned_sent =
7522 			streamoute->abandoned_sent[__SCTP_PR_INDEX(policy)];
7523 	}
7524 
7525 	if (put_user(len, optlen) || copy_to_user(optval, &params, len)) {
7526 		retval = -EFAULT;
7527 		goto out;
7528 	}
7529 
7530 	retval = 0;
7531 
7532 out:
7533 	return retval;
7534 }
7535 
7536 static int sctp_getsockopt_reconfig_supported(struct sock *sk, int len,
7537 					      char __user *optval,
7538 					      int __user *optlen)
7539 {
7540 	struct sctp_assoc_value params;
7541 	struct sctp_association *asoc;
7542 	int retval = -EFAULT;
7543 
7544 	if (len < sizeof(params)) {
7545 		retval = -EINVAL;
7546 		goto out;
7547 	}
7548 
7549 	len = sizeof(params);
7550 	if (copy_from_user(&params, optval, len))
7551 		goto out;
7552 
7553 	asoc = sctp_id2assoc(sk, params.assoc_id);
7554 	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7555 	    sctp_style(sk, UDP)) {
7556 		retval = -EINVAL;
7557 		goto out;
7558 	}
7559 
7560 	params.assoc_value = asoc ? asoc->peer.reconf_capable
7561 				  : sctp_sk(sk)->ep->reconf_enable;
7562 
7563 	if (put_user(len, optlen))
7564 		goto out;
7565 
7566 	if (copy_to_user(optval, &params, len))
7567 		goto out;
7568 
7569 	retval = 0;
7570 
7571 out:
7572 	return retval;
7573 }
7574 
7575 static int sctp_getsockopt_enable_strreset(struct sock *sk, int len,
7576 					   char __user *optval,
7577 					   int __user *optlen)
7578 {
7579 	struct sctp_assoc_value params;
7580 	struct sctp_association *asoc;
7581 	int retval = -EFAULT;
7582 
7583 	if (len < sizeof(params)) {
7584 		retval = -EINVAL;
7585 		goto out;
7586 	}
7587 
7588 	len = sizeof(params);
7589 	if (copy_from_user(&params, optval, len))
7590 		goto out;
7591 
7592 	asoc = sctp_id2assoc(sk, params.assoc_id);
7593 	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7594 	    sctp_style(sk, UDP)) {
7595 		retval = -EINVAL;
7596 		goto out;
7597 	}
7598 
7599 	params.assoc_value = asoc ? asoc->strreset_enable
7600 				  : sctp_sk(sk)->ep->strreset_enable;
7601 
7602 	if (put_user(len, optlen))
7603 		goto out;
7604 
7605 	if (copy_to_user(optval, &params, len))
7606 		goto out;
7607 
7608 	retval = 0;
7609 
7610 out:
7611 	return retval;
7612 }
7613 
7614 static int sctp_getsockopt_scheduler(struct sock *sk, int len,
7615 				     char __user *optval,
7616 				     int __user *optlen)
7617 {
7618 	struct sctp_assoc_value params;
7619 	struct sctp_association *asoc;
7620 	int retval = -EFAULT;
7621 
7622 	if (len < sizeof(params)) {
7623 		retval = -EINVAL;
7624 		goto out;
7625 	}
7626 
7627 	len = sizeof(params);
7628 	if (copy_from_user(&params, optval, len))
7629 		goto out;
7630 
7631 	asoc = sctp_id2assoc(sk, params.assoc_id);
7632 	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7633 	    sctp_style(sk, UDP)) {
7634 		retval = -EINVAL;
7635 		goto out;
7636 	}
7637 
7638 	params.assoc_value = asoc ? sctp_sched_get_sched(asoc)
7639 				  : sctp_sk(sk)->default_ss;
7640 
7641 	if (put_user(len, optlen))
7642 		goto out;
7643 
7644 	if (copy_to_user(optval, &params, len))
7645 		goto out;
7646 
7647 	retval = 0;
7648 
7649 out:
7650 	return retval;
7651 }
7652 
7653 static int sctp_getsockopt_scheduler_value(struct sock *sk, int len,
7654 					   char __user *optval,
7655 					   int __user *optlen)
7656 {
7657 	struct sctp_stream_value params;
7658 	struct sctp_association *asoc;
7659 	int retval = -EFAULT;
7660 
7661 	if (len < sizeof(params)) {
7662 		retval = -EINVAL;
7663 		goto out;
7664 	}
7665 
7666 	len = sizeof(params);
7667 	if (copy_from_user(&params, optval, len))
7668 		goto out;
7669 
7670 	asoc = sctp_id2assoc(sk, params.assoc_id);
7671 	if (!asoc) {
7672 		retval = -EINVAL;
7673 		goto out;
7674 	}
7675 
7676 	retval = sctp_sched_get_value(asoc, params.stream_id,
7677 				      &params.stream_value);
7678 	if (retval)
7679 		goto out;
7680 
7681 	if (put_user(len, optlen)) {
7682 		retval = -EFAULT;
7683 		goto out;
7684 	}
7685 
7686 	if (copy_to_user(optval, &params, len)) {
7687 		retval = -EFAULT;
7688 		goto out;
7689 	}
7690 
7691 out:
7692 	return retval;
7693 }
7694 
7695 static int sctp_getsockopt_interleaving_supported(struct sock *sk, int len,
7696 						  char __user *optval,
7697 						  int __user *optlen)
7698 {
7699 	struct sctp_assoc_value params;
7700 	struct sctp_association *asoc;
7701 	int retval = -EFAULT;
7702 
7703 	if (len < sizeof(params)) {
7704 		retval = -EINVAL;
7705 		goto out;
7706 	}
7707 
7708 	len = sizeof(params);
7709 	if (copy_from_user(&params, optval, len))
7710 		goto out;
7711 
7712 	asoc = sctp_id2assoc(sk, params.assoc_id);
7713 	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7714 	    sctp_style(sk, UDP)) {
7715 		retval = -EINVAL;
7716 		goto out;
7717 	}
7718 
7719 	params.assoc_value = asoc ? asoc->peer.intl_capable
7720 				  : sctp_sk(sk)->ep->intl_enable;
7721 
7722 	if (put_user(len, optlen))
7723 		goto out;
7724 
7725 	if (copy_to_user(optval, &params, len))
7726 		goto out;
7727 
7728 	retval = 0;
7729 
7730 out:
7731 	return retval;
7732 }
7733 
7734 static int sctp_getsockopt_reuse_port(struct sock *sk, int len,
7735 				      char __user *optval,
7736 				      int __user *optlen)
7737 {
7738 	int val;
7739 
7740 	if (len < sizeof(int))
7741 		return -EINVAL;
7742 
7743 	len = sizeof(int);
7744 	val = sctp_sk(sk)->reuse;
7745 	if (put_user(len, optlen))
7746 		return -EFAULT;
7747 
7748 	if (copy_to_user(optval, &val, len))
7749 		return -EFAULT;
7750 
7751 	return 0;
7752 }
7753 
7754 static int sctp_getsockopt_event(struct sock *sk, int len, char __user *optval,
7755 				 int __user *optlen)
7756 {
7757 	struct sctp_association *asoc;
7758 	struct sctp_event param;
7759 	__u16 subscribe;
7760 
7761 	if (len < sizeof(param))
7762 		return -EINVAL;
7763 
7764 	len = sizeof(param);
7765 	if (copy_from_user(&param, optval, len))
7766 		return -EFAULT;
7767 
7768 	if (param.se_type < SCTP_SN_TYPE_BASE ||
7769 	    param.se_type > SCTP_SN_TYPE_MAX)
7770 		return -EINVAL;
7771 
7772 	asoc = sctp_id2assoc(sk, param.se_assoc_id);
7773 	if (!asoc && param.se_assoc_id != SCTP_FUTURE_ASSOC &&
7774 	    sctp_style(sk, UDP))
7775 		return -EINVAL;
7776 
7777 	subscribe = asoc ? asoc->subscribe : sctp_sk(sk)->subscribe;
7778 	param.se_on = sctp_ulpevent_type_enabled(subscribe, param.se_type);
7779 
7780 	if (put_user(len, optlen))
7781 		return -EFAULT;
7782 
7783 	if (copy_to_user(optval, &param, len))
7784 		return -EFAULT;
7785 
7786 	return 0;
7787 }
7788 
7789 static int sctp_getsockopt_asconf_supported(struct sock *sk, int len,
7790 					    char __user *optval,
7791 					    int __user *optlen)
7792 {
7793 	struct sctp_assoc_value params;
7794 	struct sctp_association *asoc;
7795 	int retval = -EFAULT;
7796 
7797 	if (len < sizeof(params)) {
7798 		retval = -EINVAL;
7799 		goto out;
7800 	}
7801 
7802 	len = sizeof(params);
7803 	if (copy_from_user(&params, optval, len))
7804 		goto out;
7805 
7806 	asoc = sctp_id2assoc(sk, params.assoc_id);
7807 	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7808 	    sctp_style(sk, UDP)) {
7809 		retval = -EINVAL;
7810 		goto out;
7811 	}
7812 
7813 	params.assoc_value = asoc ? asoc->peer.asconf_capable
7814 				  : sctp_sk(sk)->ep->asconf_enable;
7815 
7816 	if (put_user(len, optlen))
7817 		goto out;
7818 
7819 	if (copy_to_user(optval, &params, len))
7820 		goto out;
7821 
7822 	retval = 0;
7823 
7824 out:
7825 	return retval;
7826 }
7827 
7828 static int sctp_getsockopt_auth_supported(struct sock *sk, int len,
7829 					  char __user *optval,
7830 					  int __user *optlen)
7831 {
7832 	struct sctp_assoc_value params;
7833 	struct sctp_association *asoc;
7834 	int retval = -EFAULT;
7835 
7836 	if (len < sizeof(params)) {
7837 		retval = -EINVAL;
7838 		goto out;
7839 	}
7840 
7841 	len = sizeof(params);
7842 	if (copy_from_user(&params, optval, len))
7843 		goto out;
7844 
7845 	asoc = sctp_id2assoc(sk, params.assoc_id);
7846 	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7847 	    sctp_style(sk, UDP)) {
7848 		retval = -EINVAL;
7849 		goto out;
7850 	}
7851 
7852 	params.assoc_value = asoc ? asoc->peer.auth_capable
7853 				  : sctp_sk(sk)->ep->auth_enable;
7854 
7855 	if (put_user(len, optlen))
7856 		goto out;
7857 
7858 	if (copy_to_user(optval, &params, len))
7859 		goto out;
7860 
7861 	retval = 0;
7862 
7863 out:
7864 	return retval;
7865 }
7866 
7867 static int sctp_getsockopt_ecn_supported(struct sock *sk, int len,
7868 					 char __user *optval,
7869 					 int __user *optlen)
7870 {
7871 	struct sctp_assoc_value params;
7872 	struct sctp_association *asoc;
7873 	int retval = -EFAULT;
7874 
7875 	if (len < sizeof(params)) {
7876 		retval = -EINVAL;
7877 		goto out;
7878 	}
7879 
7880 	len = sizeof(params);
7881 	if (copy_from_user(&params, optval, len))
7882 		goto out;
7883 
7884 	asoc = sctp_id2assoc(sk, params.assoc_id);
7885 	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7886 	    sctp_style(sk, UDP)) {
7887 		retval = -EINVAL;
7888 		goto out;
7889 	}
7890 
7891 	params.assoc_value = asoc ? asoc->peer.ecn_capable
7892 				  : sctp_sk(sk)->ep->ecn_enable;
7893 
7894 	if (put_user(len, optlen))
7895 		goto out;
7896 
7897 	if (copy_to_user(optval, &params, len))
7898 		goto out;
7899 
7900 	retval = 0;
7901 
7902 out:
7903 	return retval;
7904 }
7905 
7906 static int sctp_getsockopt_pf_expose(struct sock *sk, int len,
7907 				     char __user *optval,
7908 				     int __user *optlen)
7909 {
7910 	struct sctp_assoc_value params;
7911 	struct sctp_association *asoc;
7912 	int retval = -EFAULT;
7913 
7914 	if (len < sizeof(params)) {
7915 		retval = -EINVAL;
7916 		goto out;
7917 	}
7918 
7919 	len = sizeof(params);
7920 	if (copy_from_user(&params, optval, len))
7921 		goto out;
7922 
7923 	asoc = sctp_id2assoc(sk, params.assoc_id);
7924 	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7925 	    sctp_style(sk, UDP)) {
7926 		retval = -EINVAL;
7927 		goto out;
7928 	}
7929 
7930 	params.assoc_value = asoc ? asoc->pf_expose
7931 				  : sctp_sk(sk)->pf_expose;
7932 
7933 	if (put_user(len, optlen))
7934 		goto out;
7935 
7936 	if (copy_to_user(optval, &params, len))
7937 		goto out;
7938 
7939 	retval = 0;
7940 
7941 out:
7942 	return retval;
7943 }
7944 
7945 static int sctp_getsockopt_encap_port(struct sock *sk, int len,
7946 				      char __user *optval, int __user *optlen)
7947 {
7948 	struct sctp_association *asoc;
7949 	struct sctp_udpencaps encap;
7950 	struct sctp_transport *t;
7951 	__be16 encap_port;
7952 
7953 	if (len < sizeof(encap))
7954 		return -EINVAL;
7955 
7956 	len = sizeof(encap);
7957 	if (copy_from_user(&encap, optval, len))
7958 		return -EFAULT;
7959 
7960 	/* If an address other than INADDR_ANY is specified, and
7961 	 * no transport is found, then the request is invalid.
7962 	 */
7963 	if (!sctp_is_any(sk, (union sctp_addr *)&encap.sue_address)) {
7964 		t = sctp_addr_id2transport(sk, &encap.sue_address,
7965 					   encap.sue_assoc_id);
7966 		if (!t) {
7967 			pr_debug("%s: failed no transport\n", __func__);
7968 			return -EINVAL;
7969 		}
7970 
7971 		encap_port = t->encap_port;
7972 		goto out;
7973 	}
7974 
7975 	/* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
7976 	 * socket is a one to many style socket, and an association
7977 	 * was not found, then the id was invalid.
7978 	 */
7979 	asoc = sctp_id2assoc(sk, encap.sue_assoc_id);
7980 	if (!asoc && encap.sue_assoc_id != SCTP_FUTURE_ASSOC &&
7981 	    sctp_style(sk, UDP)) {
7982 		pr_debug("%s: failed no association\n", __func__);
7983 		return -EINVAL;
7984 	}
7985 
7986 	if (asoc) {
7987 		encap_port = asoc->encap_port;
7988 		goto out;
7989 	}
7990 
7991 	encap_port = sctp_sk(sk)->encap_port;
7992 
7993 out:
7994 	encap.sue_port = (__force uint16_t)encap_port;
7995 	if (copy_to_user(optval, &encap, len))
7996 		return -EFAULT;
7997 
7998 	if (put_user(len, optlen))
7999 		return -EFAULT;
8000 
8001 	return 0;
8002 }
8003 
8004 static int sctp_getsockopt_probe_interval(struct sock *sk, int len,
8005 					  char __user *optval,
8006 					  int __user *optlen)
8007 {
8008 	struct sctp_probeinterval params;
8009 	struct sctp_association *asoc;
8010 	struct sctp_transport *t;
8011 	__u32 probe_interval;
8012 
8013 	if (len < sizeof(params))
8014 		return -EINVAL;
8015 
8016 	len = sizeof(params);
8017 	if (copy_from_user(&params, optval, len))
8018 		return -EFAULT;
8019 
8020 	/* If an address other than INADDR_ANY is specified, and
8021 	 * no transport is found, then the request is invalid.
8022 	 */
8023 	if (!sctp_is_any(sk, (union sctp_addr *)&params.spi_address)) {
8024 		t = sctp_addr_id2transport(sk, &params.spi_address,
8025 					   params.spi_assoc_id);
8026 		if (!t) {
8027 			pr_debug("%s: failed no transport\n", __func__);
8028 			return -EINVAL;
8029 		}
8030 
8031 		probe_interval = jiffies_to_msecs(t->probe_interval);
8032 		goto out;
8033 	}
8034 
8035 	/* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
8036 	 * socket is a one to many style socket, and an association
8037 	 * was not found, then the id was invalid.
8038 	 */
8039 	asoc = sctp_id2assoc(sk, params.spi_assoc_id);
8040 	if (!asoc && params.spi_assoc_id != SCTP_FUTURE_ASSOC &&
8041 	    sctp_style(sk, UDP)) {
8042 		pr_debug("%s: failed no association\n", __func__);
8043 		return -EINVAL;
8044 	}
8045 
8046 	if (asoc) {
8047 		probe_interval = jiffies_to_msecs(asoc->probe_interval);
8048 		goto out;
8049 	}
8050 
8051 	probe_interval = sctp_sk(sk)->probe_interval;
8052 
8053 out:
8054 	params.spi_interval = probe_interval;
8055 	if (copy_to_user(optval, &params, len))
8056 		return -EFAULT;
8057 
8058 	if (put_user(len, optlen))
8059 		return -EFAULT;
8060 
8061 	return 0;
8062 }
8063 
8064 static int sctp_getsockopt(struct sock *sk, int level, int optname,
8065 			   char __user *optval, int __user *optlen)
8066 {
8067 	int retval = 0;
8068 	int len;
8069 
8070 	pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
8071 
8072 	/* I can hardly begin to describe how wrong this is.  This is
8073 	 * so broken as to be worse than useless.  The API draft
8074 	 * REALLY is NOT helpful here...  I am not convinced that the
8075 	 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
8076 	 * are at all well-founded.
8077 	 */
8078 	if (level != SOL_SCTP) {
8079 		struct sctp_af *af = sctp_sk(sk)->pf->af;
8080 
8081 		retval = af->getsockopt(sk, level, optname, optval, optlen);
8082 		return retval;
8083 	}
8084 
8085 	if (get_user(len, optlen))
8086 		return -EFAULT;
8087 
8088 	if (len < 0)
8089 		return -EINVAL;
8090 
8091 	lock_sock(sk);
8092 
8093 	switch (optname) {
8094 	case SCTP_STATUS:
8095 		retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
8096 		break;
8097 	case SCTP_DISABLE_FRAGMENTS:
8098 		retval = sctp_getsockopt_disable_fragments(sk, len, optval,
8099 							   optlen);
8100 		break;
8101 	case SCTP_EVENTS:
8102 		retval = sctp_getsockopt_events(sk, len, optval, optlen);
8103 		break;
8104 	case SCTP_AUTOCLOSE:
8105 		retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
8106 		break;
8107 	case SCTP_SOCKOPT_PEELOFF:
8108 		retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
8109 		break;
8110 	case SCTP_SOCKOPT_PEELOFF_FLAGS:
8111 		retval = sctp_getsockopt_peeloff_flags(sk, len, optval, optlen);
8112 		break;
8113 	case SCTP_PEER_ADDR_PARAMS:
8114 		retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
8115 							  optlen);
8116 		break;
8117 	case SCTP_DELAYED_SACK:
8118 		retval = sctp_getsockopt_delayed_ack(sk, len, optval,
8119 							  optlen);
8120 		break;
8121 	case SCTP_INITMSG:
8122 		retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
8123 		break;
8124 	case SCTP_GET_PEER_ADDRS:
8125 		retval = sctp_getsockopt_peer_addrs(sk, len, optval,
8126 						    optlen);
8127 		break;
8128 	case SCTP_GET_LOCAL_ADDRS:
8129 		retval = sctp_getsockopt_local_addrs(sk, len, optval,
8130 						     optlen);
8131 		break;
8132 	case SCTP_SOCKOPT_CONNECTX3:
8133 		retval = sctp_getsockopt_connectx3(sk, len, optval, optlen);
8134 		break;
8135 	case SCTP_DEFAULT_SEND_PARAM:
8136 		retval = sctp_getsockopt_default_send_param(sk, len,
8137 							    optval, optlen);
8138 		break;
8139 	case SCTP_DEFAULT_SNDINFO:
8140 		retval = sctp_getsockopt_default_sndinfo(sk, len,
8141 							 optval, optlen);
8142 		break;
8143 	case SCTP_PRIMARY_ADDR:
8144 		retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
8145 		break;
8146 	case SCTP_NODELAY:
8147 		retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
8148 		break;
8149 	case SCTP_RTOINFO:
8150 		retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
8151 		break;
8152 	case SCTP_ASSOCINFO:
8153 		retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
8154 		break;
8155 	case SCTP_I_WANT_MAPPED_V4_ADDR:
8156 		retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
8157 		break;
8158 	case SCTP_MAXSEG:
8159 		retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
8160 		break;
8161 	case SCTP_GET_PEER_ADDR_INFO:
8162 		retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
8163 							optlen);
8164 		break;
8165 	case SCTP_ADAPTATION_LAYER:
8166 		retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
8167 							optlen);
8168 		break;
8169 	case SCTP_CONTEXT:
8170 		retval = sctp_getsockopt_context(sk, len, optval, optlen);
8171 		break;
8172 	case SCTP_FRAGMENT_INTERLEAVE:
8173 		retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
8174 							     optlen);
8175 		break;
8176 	case SCTP_PARTIAL_DELIVERY_POINT:
8177 		retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
8178 								optlen);
8179 		break;
8180 	case SCTP_MAX_BURST:
8181 		retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
8182 		break;
8183 	case SCTP_AUTH_KEY:
8184 	case SCTP_AUTH_CHUNK:
8185 	case SCTP_AUTH_DELETE_KEY:
8186 	case SCTP_AUTH_DEACTIVATE_KEY:
8187 		retval = -EOPNOTSUPP;
8188 		break;
8189 	case SCTP_HMAC_IDENT:
8190 		retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen);
8191 		break;
8192 	case SCTP_AUTH_ACTIVE_KEY:
8193 		retval = sctp_getsockopt_active_key(sk, len, optval, optlen);
8194 		break;
8195 	case SCTP_PEER_AUTH_CHUNKS:
8196 		retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval,
8197 							optlen);
8198 		break;
8199 	case SCTP_LOCAL_AUTH_CHUNKS:
8200 		retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
8201 							optlen);
8202 		break;
8203 	case SCTP_GET_ASSOC_NUMBER:
8204 		retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
8205 		break;
8206 	case SCTP_GET_ASSOC_ID_LIST:
8207 		retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);
8208 		break;
8209 	case SCTP_AUTO_ASCONF:
8210 		retval = sctp_getsockopt_auto_asconf(sk, len, optval, optlen);
8211 		break;
8212 	case SCTP_PEER_ADDR_THLDS:
8213 		retval = sctp_getsockopt_paddr_thresholds(sk, optval, len,
8214 							  optlen, false);
8215 		break;
8216 	case SCTP_PEER_ADDR_THLDS_V2:
8217 		retval = sctp_getsockopt_paddr_thresholds(sk, optval, len,
8218 							  optlen, true);
8219 		break;
8220 	case SCTP_GET_ASSOC_STATS:
8221 		retval = sctp_getsockopt_assoc_stats(sk, len, optval, optlen);
8222 		break;
8223 	case SCTP_RECVRCVINFO:
8224 		retval = sctp_getsockopt_recvrcvinfo(sk, len, optval, optlen);
8225 		break;
8226 	case SCTP_RECVNXTINFO:
8227 		retval = sctp_getsockopt_recvnxtinfo(sk, len, optval, optlen);
8228 		break;
8229 	case SCTP_PR_SUPPORTED:
8230 		retval = sctp_getsockopt_pr_supported(sk, len, optval, optlen);
8231 		break;
8232 	case SCTP_DEFAULT_PRINFO:
8233 		retval = sctp_getsockopt_default_prinfo(sk, len, optval,
8234 							optlen);
8235 		break;
8236 	case SCTP_PR_ASSOC_STATUS:
8237 		retval = sctp_getsockopt_pr_assocstatus(sk, len, optval,
8238 							optlen);
8239 		break;
8240 	case SCTP_PR_STREAM_STATUS:
8241 		retval = sctp_getsockopt_pr_streamstatus(sk, len, optval,
8242 							 optlen);
8243 		break;
8244 	case SCTP_RECONFIG_SUPPORTED:
8245 		retval = sctp_getsockopt_reconfig_supported(sk, len, optval,
8246 							    optlen);
8247 		break;
8248 	case SCTP_ENABLE_STREAM_RESET:
8249 		retval = sctp_getsockopt_enable_strreset(sk, len, optval,
8250 							 optlen);
8251 		break;
8252 	case SCTP_STREAM_SCHEDULER:
8253 		retval = sctp_getsockopt_scheduler(sk, len, optval,
8254 						   optlen);
8255 		break;
8256 	case SCTP_STREAM_SCHEDULER_VALUE:
8257 		retval = sctp_getsockopt_scheduler_value(sk, len, optval,
8258 							 optlen);
8259 		break;
8260 	case SCTP_INTERLEAVING_SUPPORTED:
8261 		retval = sctp_getsockopt_interleaving_supported(sk, len, optval,
8262 								optlen);
8263 		break;
8264 	case SCTP_REUSE_PORT:
8265 		retval = sctp_getsockopt_reuse_port(sk, len, optval, optlen);
8266 		break;
8267 	case SCTP_EVENT:
8268 		retval = sctp_getsockopt_event(sk, len, optval, optlen);
8269 		break;
8270 	case SCTP_ASCONF_SUPPORTED:
8271 		retval = sctp_getsockopt_asconf_supported(sk, len, optval,
8272 							  optlen);
8273 		break;
8274 	case SCTP_AUTH_SUPPORTED:
8275 		retval = sctp_getsockopt_auth_supported(sk, len, optval,
8276 							optlen);
8277 		break;
8278 	case SCTP_ECN_SUPPORTED:
8279 		retval = sctp_getsockopt_ecn_supported(sk, len, optval, optlen);
8280 		break;
8281 	case SCTP_EXPOSE_POTENTIALLY_FAILED_STATE:
8282 		retval = sctp_getsockopt_pf_expose(sk, len, optval, optlen);
8283 		break;
8284 	case SCTP_REMOTE_UDP_ENCAPS_PORT:
8285 		retval = sctp_getsockopt_encap_port(sk, len, optval, optlen);
8286 		break;
8287 	case SCTP_PLPMTUD_PROBE_INTERVAL:
8288 		retval = sctp_getsockopt_probe_interval(sk, len, optval, optlen);
8289 		break;
8290 	default:
8291 		retval = -ENOPROTOOPT;
8292 		break;
8293 	}
8294 
8295 	release_sock(sk);
8296 	return retval;
8297 }
8298 
8299 static bool sctp_bpf_bypass_getsockopt(int level, int optname)
8300 {
8301 	if (level == SOL_SCTP) {
8302 		switch (optname) {
8303 		case SCTP_SOCKOPT_PEELOFF:
8304 		case SCTP_SOCKOPT_PEELOFF_FLAGS:
8305 		case SCTP_SOCKOPT_CONNECTX3:
8306 			return true;
8307 		default:
8308 			return false;
8309 		}
8310 	}
8311 
8312 	return false;
8313 }
8314 
8315 static int sctp_hash(struct sock *sk)
8316 {
8317 	/* STUB */
8318 	return 0;
8319 }
8320 
8321 static void sctp_unhash(struct sock *sk)
8322 {
8323 	/* STUB */
8324 }
8325 
8326 /* Check if port is acceptable.  Possibly find first available port.
8327  *
8328  * The port hash table (contained in the 'global' SCTP protocol storage
8329  * returned by struct sctp_protocol *sctp_get_protocol()). The hash
8330  * table is an array of 4096 lists (sctp_bind_hashbucket). Each
8331  * list (the list number is the port number hashed out, so as you
8332  * would expect from a hash function, all the ports in a given list have
8333  * such a number that hashes out to the same list number; you were
8334  * expecting that, right?); so each list has a set of ports, with a
8335  * link to the socket (struct sock) that uses it, the port number and
8336  * a fastreuse flag (FIXME: NPI ipg).
8337  */
8338 static struct sctp_bind_bucket *sctp_bucket_create(
8339 	struct sctp_bind_hashbucket *head, struct net *, unsigned short snum);
8340 
8341 static int sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
8342 {
8343 	struct sctp_sock *sp = sctp_sk(sk);
8344 	bool reuse = (sk->sk_reuse || sp->reuse);
8345 	struct sctp_bind_hashbucket *head; /* hash list */
8346 	struct net *net = sock_net(sk);
8347 	kuid_t uid = sock_i_uid(sk);
8348 	struct sctp_bind_bucket *pp;
8349 	unsigned short snum;
8350 	int ret;
8351 
8352 	snum = ntohs(addr->v4.sin_port);
8353 
8354 	pr_debug("%s: begins, snum:%d\n", __func__, snum);
8355 
8356 	if (snum == 0) {
8357 		/* Search for an available port. */
8358 		int low, high, remaining, index;
8359 		unsigned int rover;
8360 
8361 		inet_sk_get_local_port_range(sk, &low, &high);
8362 		remaining = (high - low) + 1;
8363 		rover = get_random_u32_below(remaining) + low;
8364 
8365 		do {
8366 			rover++;
8367 			if ((rover < low) || (rover > high))
8368 				rover = low;
8369 			if (inet_is_local_reserved_port(net, rover))
8370 				continue;
8371 			index = sctp_phashfn(net, rover);
8372 			head = &sctp_port_hashtable[index];
8373 			spin_lock_bh(&head->lock);
8374 			sctp_for_each_hentry(pp, &head->chain)
8375 				if ((pp->port == rover) &&
8376 				    net_eq(net, pp->net))
8377 					goto next;
8378 			break;
8379 		next:
8380 			spin_unlock_bh(&head->lock);
8381 			cond_resched();
8382 		} while (--remaining > 0);
8383 
8384 		/* Exhausted local port range during search? */
8385 		ret = 1;
8386 		if (remaining <= 0)
8387 			return ret;
8388 
8389 		/* OK, here is the one we will use.  HEAD (the port
8390 		 * hash table list entry) is non-NULL and we hold it's
8391 		 * mutex.
8392 		 */
8393 		snum = rover;
8394 	} else {
8395 		/* We are given an specific port number; we verify
8396 		 * that it is not being used. If it is used, we will
8397 		 * exahust the search in the hash list corresponding
8398 		 * to the port number (snum) - we detect that with the
8399 		 * port iterator, pp being NULL.
8400 		 */
8401 		head = &sctp_port_hashtable[sctp_phashfn(net, snum)];
8402 		spin_lock_bh(&head->lock);
8403 		sctp_for_each_hentry(pp, &head->chain) {
8404 			if ((pp->port == snum) && net_eq(pp->net, net))
8405 				goto pp_found;
8406 		}
8407 	}
8408 	pp = NULL;
8409 	goto pp_not_found;
8410 pp_found:
8411 	if (!hlist_empty(&pp->owner)) {
8412 		/* We had a port hash table hit - there is an
8413 		 * available port (pp != NULL) and it is being
8414 		 * used by other socket (pp->owner not empty); that other
8415 		 * socket is going to be sk2.
8416 		 */
8417 		struct sock *sk2;
8418 
8419 		pr_debug("%s: found a possible match\n", __func__);
8420 
8421 		if ((pp->fastreuse && reuse &&
8422 		     sk->sk_state != SCTP_SS_LISTENING) ||
8423 		    (pp->fastreuseport && sk->sk_reuseport &&
8424 		     uid_eq(pp->fastuid, uid)))
8425 			goto success;
8426 
8427 		/* Run through the list of sockets bound to the port
8428 		 * (pp->port) [via the pointers bind_next and
8429 		 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
8430 		 * we get the endpoint they describe and run through
8431 		 * the endpoint's list of IP (v4 or v6) addresses,
8432 		 * comparing each of the addresses with the address of
8433 		 * the socket sk. If we find a match, then that means
8434 		 * that this port/socket (sk) combination are already
8435 		 * in an endpoint.
8436 		 */
8437 		sk_for_each_bound(sk2, &pp->owner) {
8438 			int bound_dev_if2 = READ_ONCE(sk2->sk_bound_dev_if);
8439 			struct sctp_sock *sp2 = sctp_sk(sk2);
8440 			struct sctp_endpoint *ep2 = sp2->ep;
8441 
8442 			if (sk == sk2 ||
8443 			    (reuse && (sk2->sk_reuse || sp2->reuse) &&
8444 			     sk2->sk_state != SCTP_SS_LISTENING) ||
8445 			    (sk->sk_reuseport && sk2->sk_reuseport &&
8446 			     uid_eq(uid, sock_i_uid(sk2))))
8447 				continue;
8448 
8449 			if ((!sk->sk_bound_dev_if || !bound_dev_if2 ||
8450 			     sk->sk_bound_dev_if == bound_dev_if2) &&
8451 			    sctp_bind_addr_conflict(&ep2->base.bind_addr,
8452 						    addr, sp2, sp)) {
8453 				ret = 1;
8454 				goto fail_unlock;
8455 			}
8456 		}
8457 
8458 		pr_debug("%s: found a match\n", __func__);
8459 	}
8460 pp_not_found:
8461 	/* If there was a hash table miss, create a new port.  */
8462 	ret = 1;
8463 	if (!pp && !(pp = sctp_bucket_create(head, net, snum)))
8464 		goto fail_unlock;
8465 
8466 	/* In either case (hit or miss), make sure fastreuse is 1 only
8467 	 * if sk->sk_reuse is too (that is, if the caller requested
8468 	 * SO_REUSEADDR on this socket -sk-).
8469 	 */
8470 	if (hlist_empty(&pp->owner)) {
8471 		if (reuse && sk->sk_state != SCTP_SS_LISTENING)
8472 			pp->fastreuse = 1;
8473 		else
8474 			pp->fastreuse = 0;
8475 
8476 		if (sk->sk_reuseport) {
8477 			pp->fastreuseport = 1;
8478 			pp->fastuid = uid;
8479 		} else {
8480 			pp->fastreuseport = 0;
8481 		}
8482 	} else {
8483 		if (pp->fastreuse &&
8484 		    (!reuse || sk->sk_state == SCTP_SS_LISTENING))
8485 			pp->fastreuse = 0;
8486 
8487 		if (pp->fastreuseport &&
8488 		    (!sk->sk_reuseport || !uid_eq(pp->fastuid, uid)))
8489 			pp->fastreuseport = 0;
8490 	}
8491 
8492 	/* We are set, so fill up all the data in the hash table
8493 	 * entry, tie the socket list information with the rest of the
8494 	 * sockets FIXME: Blurry, NPI (ipg).
8495 	 */
8496 success:
8497 	if (!sp->bind_hash) {
8498 		inet_sk(sk)->inet_num = snum;
8499 		sk_add_bind_node(sk, &pp->owner);
8500 		sp->bind_hash = pp;
8501 	}
8502 	ret = 0;
8503 
8504 fail_unlock:
8505 	spin_unlock_bh(&head->lock);
8506 	return ret;
8507 }
8508 
8509 /* Assign a 'snum' port to the socket.  If snum == 0, an ephemeral
8510  * port is requested.
8511  */
8512 static int sctp_get_port(struct sock *sk, unsigned short snum)
8513 {
8514 	union sctp_addr addr;
8515 	struct sctp_af *af = sctp_sk(sk)->pf->af;
8516 
8517 	/* Set up a dummy address struct from the sk. */
8518 	af->from_sk(&addr, sk);
8519 	addr.v4.sin_port = htons(snum);
8520 
8521 	/* Note: sk->sk_num gets filled in if ephemeral port request. */
8522 	return sctp_get_port_local(sk, &addr);
8523 }
8524 
8525 /*
8526  *  Move a socket to LISTENING state.
8527  */
8528 static int sctp_listen_start(struct sock *sk, int backlog)
8529 {
8530 	struct sctp_sock *sp = sctp_sk(sk);
8531 	struct sctp_endpoint *ep = sp->ep;
8532 	struct crypto_shash *tfm = NULL;
8533 	char alg[32];
8534 
8535 	/* Allocate HMAC for generating cookie. */
8536 	if (!sp->hmac && sp->sctp_hmac_alg) {
8537 		sprintf(alg, "hmac(%s)", sp->sctp_hmac_alg);
8538 		tfm = crypto_alloc_shash(alg, 0, 0);
8539 		if (IS_ERR(tfm)) {
8540 			net_info_ratelimited("failed to load transform for %s: %ld\n",
8541 					     sp->sctp_hmac_alg, PTR_ERR(tfm));
8542 			return -ENOSYS;
8543 		}
8544 		sctp_sk(sk)->hmac = tfm;
8545 	}
8546 
8547 	/*
8548 	 * If a bind() or sctp_bindx() is not called prior to a listen()
8549 	 * call that allows new associations to be accepted, the system
8550 	 * picks an ephemeral port and will choose an address set equivalent
8551 	 * to binding with a wildcard address.
8552 	 *
8553 	 * This is not currently spelled out in the SCTP sockets
8554 	 * extensions draft, but follows the practice as seen in TCP
8555 	 * sockets.
8556 	 *
8557 	 */
8558 	inet_sk_set_state(sk, SCTP_SS_LISTENING);
8559 	if (!ep->base.bind_addr.port) {
8560 		if (sctp_autobind(sk))
8561 			return -EAGAIN;
8562 	} else {
8563 		if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
8564 			inet_sk_set_state(sk, SCTP_SS_CLOSED);
8565 			return -EADDRINUSE;
8566 		}
8567 	}
8568 
8569 	WRITE_ONCE(sk->sk_max_ack_backlog, backlog);
8570 	return sctp_hash_endpoint(ep);
8571 }
8572 
8573 /*
8574  * 4.1.3 / 5.1.3 listen()
8575  *
8576  *   By default, new associations are not accepted for UDP style sockets.
8577  *   An application uses listen() to mark a socket as being able to
8578  *   accept new associations.
8579  *
8580  *   On TCP style sockets, applications use listen() to ready the SCTP
8581  *   endpoint for accepting inbound associations.
8582  *
8583  *   On both types of endpoints a backlog of '0' disables listening.
8584  *
8585  *  Move a socket to LISTENING state.
8586  */
8587 int sctp_inet_listen(struct socket *sock, int backlog)
8588 {
8589 	struct sock *sk = sock->sk;
8590 	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
8591 	int err = -EINVAL;
8592 
8593 	if (unlikely(backlog < 0))
8594 		return err;
8595 
8596 	lock_sock(sk);
8597 
8598 	/* Peeled-off sockets are not allowed to listen().  */
8599 	if (sctp_style(sk, UDP_HIGH_BANDWIDTH))
8600 		goto out;
8601 
8602 	if (sock->state != SS_UNCONNECTED)
8603 		goto out;
8604 
8605 	if (!sctp_sstate(sk, LISTENING) && !sctp_sstate(sk, CLOSED))
8606 		goto out;
8607 
8608 	/* If backlog is zero, disable listening. */
8609 	if (!backlog) {
8610 		if (sctp_sstate(sk, CLOSED))
8611 			goto out;
8612 
8613 		err = 0;
8614 		sctp_unhash_endpoint(ep);
8615 		sk->sk_state = SCTP_SS_CLOSED;
8616 		if (sk->sk_reuse || sctp_sk(sk)->reuse)
8617 			sctp_sk(sk)->bind_hash->fastreuse = 1;
8618 		goto out;
8619 	}
8620 
8621 	/* If we are already listening, just update the backlog */
8622 	if (sctp_sstate(sk, LISTENING))
8623 		WRITE_ONCE(sk->sk_max_ack_backlog, backlog);
8624 	else {
8625 		err = sctp_listen_start(sk, backlog);
8626 		if (err)
8627 			goto out;
8628 	}
8629 
8630 	err = 0;
8631 out:
8632 	release_sock(sk);
8633 	return err;
8634 }
8635 
8636 /*
8637  * This function is done by modeling the current datagram_poll() and the
8638  * tcp_poll().  Note that, based on these implementations, we don't
8639  * lock the socket in this function, even though it seems that,
8640  * ideally, locking or some other mechanisms can be used to ensure
8641  * the integrity of the counters (sndbuf and wmem_alloc) used
8642  * in this place.  We assume that we don't need locks either until proven
8643  * otherwise.
8644  *
8645  * Another thing to note is that we include the Async I/O support
8646  * here, again, by modeling the current TCP/UDP code.  We don't have
8647  * a good way to test with it yet.
8648  */
8649 __poll_t sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
8650 {
8651 	struct sock *sk = sock->sk;
8652 	struct sctp_sock *sp = sctp_sk(sk);
8653 	__poll_t mask;
8654 
8655 	poll_wait(file, sk_sleep(sk), wait);
8656 
8657 	sock_rps_record_flow(sk);
8658 
8659 	/* A TCP-style listening socket becomes readable when the accept queue
8660 	 * is not empty.
8661 	 */
8662 	if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
8663 		return (!list_empty(&sp->ep->asocs)) ?
8664 			(EPOLLIN | EPOLLRDNORM) : 0;
8665 
8666 	mask = 0;
8667 
8668 	/* Is there any exceptional events?  */
8669 	if (sk->sk_err || !skb_queue_empty_lockless(&sk->sk_error_queue))
8670 		mask |= EPOLLERR |
8671 			(sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
8672 	if (sk->sk_shutdown & RCV_SHUTDOWN)
8673 		mask |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
8674 	if (sk->sk_shutdown == SHUTDOWN_MASK)
8675 		mask |= EPOLLHUP;
8676 
8677 	/* Is it readable?  Reconsider this code with TCP-style support.  */
8678 	if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
8679 		mask |= EPOLLIN | EPOLLRDNORM;
8680 
8681 	/* The association is either gone or not ready.  */
8682 	if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
8683 		return mask;
8684 
8685 	/* Is it writable?  */
8686 	if (sctp_writeable(sk)) {
8687 		mask |= EPOLLOUT | EPOLLWRNORM;
8688 	} else {
8689 		sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
8690 		/*
8691 		 * Since the socket is not locked, the buffer
8692 		 * might be made available after the writeable check and
8693 		 * before the bit is set.  This could cause a lost I/O
8694 		 * signal.  tcp_poll() has a race breaker for this race
8695 		 * condition.  Based on their implementation, we put
8696 		 * in the following code to cover it as well.
8697 		 */
8698 		if (sctp_writeable(sk))
8699 			mask |= EPOLLOUT | EPOLLWRNORM;
8700 	}
8701 	return mask;
8702 }
8703 
8704 /********************************************************************
8705  * 2nd Level Abstractions
8706  ********************************************************************/
8707 
8708 static struct sctp_bind_bucket *sctp_bucket_create(
8709 	struct sctp_bind_hashbucket *head, struct net *net, unsigned short snum)
8710 {
8711 	struct sctp_bind_bucket *pp;
8712 
8713 	pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
8714 	if (pp) {
8715 		SCTP_DBG_OBJCNT_INC(bind_bucket);
8716 		pp->port = snum;
8717 		pp->fastreuse = 0;
8718 		INIT_HLIST_HEAD(&pp->owner);
8719 		pp->net = net;
8720 		hlist_add_head(&pp->node, &head->chain);
8721 	}
8722 	return pp;
8723 }
8724 
8725 /* Caller must hold hashbucket lock for this tb with local BH disabled */
8726 static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
8727 {
8728 	if (pp && hlist_empty(&pp->owner)) {
8729 		__hlist_del(&pp->node);
8730 		kmem_cache_free(sctp_bucket_cachep, pp);
8731 		SCTP_DBG_OBJCNT_DEC(bind_bucket);
8732 	}
8733 }
8734 
8735 /* Release this socket's reference to a local port.  */
8736 static inline void __sctp_put_port(struct sock *sk)
8737 {
8738 	struct sctp_bind_hashbucket *head =
8739 		&sctp_port_hashtable[sctp_phashfn(sock_net(sk),
8740 						  inet_sk(sk)->inet_num)];
8741 	struct sctp_bind_bucket *pp;
8742 
8743 	spin_lock(&head->lock);
8744 	pp = sctp_sk(sk)->bind_hash;
8745 	__sk_del_bind_node(sk);
8746 	sctp_sk(sk)->bind_hash = NULL;
8747 	inet_sk(sk)->inet_num = 0;
8748 	sctp_bucket_destroy(pp);
8749 	spin_unlock(&head->lock);
8750 }
8751 
8752 void sctp_put_port(struct sock *sk)
8753 {
8754 	local_bh_disable();
8755 	__sctp_put_port(sk);
8756 	local_bh_enable();
8757 }
8758 
8759 /*
8760  * The system picks an ephemeral port and choose an address set equivalent
8761  * to binding with a wildcard address.
8762  * One of those addresses will be the primary address for the association.
8763  * This automatically enables the multihoming capability of SCTP.
8764  */
8765 static int sctp_autobind(struct sock *sk)
8766 {
8767 	union sctp_addr autoaddr;
8768 	struct sctp_af *af;
8769 	__be16 port;
8770 
8771 	/* Initialize a local sockaddr structure to INADDR_ANY. */
8772 	af = sctp_sk(sk)->pf->af;
8773 
8774 	port = htons(inet_sk(sk)->inet_num);
8775 	af->inaddr_any(&autoaddr, port);
8776 
8777 	return sctp_do_bind(sk, &autoaddr, af->sockaddr_len);
8778 }
8779 
8780 /* Parse out IPPROTO_SCTP CMSG headers.  Perform only minimal validation.
8781  *
8782  * From RFC 2292
8783  * 4.2 The cmsghdr Structure *
8784  *
8785  * When ancillary data is sent or received, any number of ancillary data
8786  * objects can be specified by the msg_control and msg_controllen members of
8787  * the msghdr structure, because each object is preceded by
8788  * a cmsghdr structure defining the object's length (the cmsg_len member).
8789  * Historically Berkeley-derived implementations have passed only one object
8790  * at a time, but this API allows multiple objects to be
8791  * passed in a single call to sendmsg() or recvmsg(). The following example
8792  * shows two ancillary data objects in a control buffer.
8793  *
8794  *   |<--------------------------- msg_controllen -------------------------->|
8795  *   |                                                                       |
8796  *
8797  *   |<----- ancillary data object ----->|<----- ancillary data object ----->|
8798  *
8799  *   |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
8800  *   |                                   |                                   |
8801  *
8802  *   |<---------- cmsg_len ---------->|  |<--------- cmsg_len ----------->|  |
8803  *
8804  *   |<--------- CMSG_LEN() --------->|  |<-------- CMSG_LEN() ---------->|  |
8805  *   |                                |  |                                |  |
8806  *
8807  *   +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
8808  *   |cmsg_|cmsg_|cmsg_|XX|           |XX|cmsg_|cmsg_|cmsg_|XX|           |XX|
8809  *
8810  *   |len  |level|type |XX|cmsg_data[]|XX|len  |level|type |XX|cmsg_data[]|XX|
8811  *
8812  *   +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
8813  *    ^
8814  *    |
8815  *
8816  * msg_control
8817  * points here
8818  */
8819 static int sctp_msghdr_parse(const struct msghdr *msg, struct sctp_cmsgs *cmsgs)
8820 {
8821 	struct msghdr *my_msg = (struct msghdr *)msg;
8822 	struct cmsghdr *cmsg;
8823 
8824 	for_each_cmsghdr(cmsg, my_msg) {
8825 		if (!CMSG_OK(my_msg, cmsg))
8826 			return -EINVAL;
8827 
8828 		/* Should we parse this header or ignore?  */
8829 		if (cmsg->cmsg_level != IPPROTO_SCTP)
8830 			continue;
8831 
8832 		/* Strictly check lengths following example in SCM code.  */
8833 		switch (cmsg->cmsg_type) {
8834 		case SCTP_INIT:
8835 			/* SCTP Socket API Extension
8836 			 * 5.3.1 SCTP Initiation Structure (SCTP_INIT)
8837 			 *
8838 			 * This cmsghdr structure provides information for
8839 			 * initializing new SCTP associations with sendmsg().
8840 			 * The SCTP_INITMSG socket option uses this same data
8841 			 * structure.  This structure is not used for
8842 			 * recvmsg().
8843 			 *
8844 			 * cmsg_level    cmsg_type      cmsg_data[]
8845 			 * ------------  ------------   ----------------------
8846 			 * IPPROTO_SCTP  SCTP_INIT      struct sctp_initmsg
8847 			 */
8848 			if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_initmsg)))
8849 				return -EINVAL;
8850 
8851 			cmsgs->init = CMSG_DATA(cmsg);
8852 			break;
8853 
8854 		case SCTP_SNDRCV:
8855 			/* SCTP Socket API Extension
8856 			 * 5.3.2 SCTP Header Information Structure(SCTP_SNDRCV)
8857 			 *
8858 			 * This cmsghdr structure specifies SCTP options for
8859 			 * sendmsg() and describes SCTP header information
8860 			 * about a received message through recvmsg().
8861 			 *
8862 			 * cmsg_level    cmsg_type      cmsg_data[]
8863 			 * ------------  ------------   ----------------------
8864 			 * IPPROTO_SCTP  SCTP_SNDRCV    struct sctp_sndrcvinfo
8865 			 */
8866 			if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
8867 				return -EINVAL;
8868 
8869 			cmsgs->srinfo = CMSG_DATA(cmsg);
8870 
8871 			if (cmsgs->srinfo->sinfo_flags &
8872 			    ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
8873 			      SCTP_SACK_IMMEDIATELY | SCTP_SENDALL |
8874 			      SCTP_PR_SCTP_MASK | SCTP_ABORT | SCTP_EOF))
8875 				return -EINVAL;
8876 			break;
8877 
8878 		case SCTP_SNDINFO:
8879 			/* SCTP Socket API Extension
8880 			 * 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO)
8881 			 *
8882 			 * This cmsghdr structure specifies SCTP options for
8883 			 * sendmsg(). This structure and SCTP_RCVINFO replaces
8884 			 * SCTP_SNDRCV which has been deprecated.
8885 			 *
8886 			 * cmsg_level    cmsg_type      cmsg_data[]
8887 			 * ------------  ------------   ---------------------
8888 			 * IPPROTO_SCTP  SCTP_SNDINFO    struct sctp_sndinfo
8889 			 */
8890 			if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndinfo)))
8891 				return -EINVAL;
8892 
8893 			cmsgs->sinfo = CMSG_DATA(cmsg);
8894 
8895 			if (cmsgs->sinfo->snd_flags &
8896 			    ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
8897 			      SCTP_SACK_IMMEDIATELY | SCTP_SENDALL |
8898 			      SCTP_PR_SCTP_MASK | SCTP_ABORT | SCTP_EOF))
8899 				return -EINVAL;
8900 			break;
8901 		case SCTP_PRINFO:
8902 			/* SCTP Socket API Extension
8903 			 * 5.3.7 SCTP PR-SCTP Information Structure (SCTP_PRINFO)
8904 			 *
8905 			 * This cmsghdr structure specifies SCTP options for sendmsg().
8906 			 *
8907 			 * cmsg_level    cmsg_type      cmsg_data[]
8908 			 * ------------  ------------   ---------------------
8909 			 * IPPROTO_SCTP  SCTP_PRINFO    struct sctp_prinfo
8910 			 */
8911 			if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_prinfo)))
8912 				return -EINVAL;
8913 
8914 			cmsgs->prinfo = CMSG_DATA(cmsg);
8915 			if (cmsgs->prinfo->pr_policy & ~SCTP_PR_SCTP_MASK)
8916 				return -EINVAL;
8917 
8918 			if (cmsgs->prinfo->pr_policy == SCTP_PR_SCTP_NONE)
8919 				cmsgs->prinfo->pr_value = 0;
8920 			break;
8921 		case SCTP_AUTHINFO:
8922 			/* SCTP Socket API Extension
8923 			 * 5.3.8 SCTP AUTH Information Structure (SCTP_AUTHINFO)
8924 			 *
8925 			 * This cmsghdr structure specifies SCTP options for sendmsg().
8926 			 *
8927 			 * cmsg_level    cmsg_type      cmsg_data[]
8928 			 * ------------  ------------   ---------------------
8929 			 * IPPROTO_SCTP  SCTP_AUTHINFO  struct sctp_authinfo
8930 			 */
8931 			if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_authinfo)))
8932 				return -EINVAL;
8933 
8934 			cmsgs->authinfo = CMSG_DATA(cmsg);
8935 			break;
8936 		case SCTP_DSTADDRV4:
8937 		case SCTP_DSTADDRV6:
8938 			/* SCTP Socket API Extension
8939 			 * 5.3.9/10 SCTP Destination IPv4/6 Address Structure (SCTP_DSTADDRV4/6)
8940 			 *
8941 			 * This cmsghdr structure specifies SCTP options for sendmsg().
8942 			 *
8943 			 * cmsg_level    cmsg_type         cmsg_data[]
8944 			 * ------------  ------------   ---------------------
8945 			 * IPPROTO_SCTP  SCTP_DSTADDRV4 struct in_addr
8946 			 * ------------  ------------   ---------------------
8947 			 * IPPROTO_SCTP  SCTP_DSTADDRV6 struct in6_addr
8948 			 */
8949 			cmsgs->addrs_msg = my_msg;
8950 			break;
8951 		default:
8952 			return -EINVAL;
8953 		}
8954 	}
8955 
8956 	return 0;
8957 }
8958 
8959 /*
8960  * Wait for a packet..
8961  * Note: This function is the same function as in core/datagram.c
8962  * with a few modifications to make lksctp work.
8963  */
8964 static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p)
8965 {
8966 	int error;
8967 	DEFINE_WAIT(wait);
8968 
8969 	prepare_to_wait_exclusive(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
8970 
8971 	/* Socket errors? */
8972 	error = sock_error(sk);
8973 	if (error)
8974 		goto out;
8975 
8976 	if (!skb_queue_empty(&sk->sk_receive_queue))
8977 		goto ready;
8978 
8979 	/* Socket shut down?  */
8980 	if (sk->sk_shutdown & RCV_SHUTDOWN)
8981 		goto out;
8982 
8983 	/* Sequenced packets can come disconnected.  If so we report the
8984 	 * problem.
8985 	 */
8986 	error = -ENOTCONN;
8987 
8988 	/* Is there a good reason to think that we may receive some data?  */
8989 	if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
8990 		goto out;
8991 
8992 	/* Handle signals.  */
8993 	if (signal_pending(current))
8994 		goto interrupted;
8995 
8996 	/* Let another process have a go.  Since we are going to sleep
8997 	 * anyway.  Note: This may cause odd behaviors if the message
8998 	 * does not fit in the user's buffer, but this seems to be the
8999 	 * only way to honor MSG_DONTWAIT realistically.
9000 	 */
9001 	release_sock(sk);
9002 	*timeo_p = schedule_timeout(*timeo_p);
9003 	lock_sock(sk);
9004 
9005 ready:
9006 	finish_wait(sk_sleep(sk), &wait);
9007 	return 0;
9008 
9009 interrupted:
9010 	error = sock_intr_errno(*timeo_p);
9011 
9012 out:
9013 	finish_wait(sk_sleep(sk), &wait);
9014 	*err = error;
9015 	return error;
9016 }
9017 
9018 /* Receive a datagram.
9019  * Note: This is pretty much the same routine as in core/datagram.c
9020  * with a few changes to make lksctp work.
9021  */
9022 struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags, int *err)
9023 {
9024 	int error;
9025 	struct sk_buff *skb;
9026 	long timeo;
9027 
9028 	timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
9029 
9030 	pr_debug("%s: timeo:%ld, max:%ld\n", __func__, timeo,
9031 		 MAX_SCHEDULE_TIMEOUT);
9032 
9033 	do {
9034 		/* Again only user level code calls this function,
9035 		 * so nothing interrupt level
9036 		 * will suddenly eat the receive_queue.
9037 		 *
9038 		 *  Look at current nfs client by the way...
9039 		 *  However, this function was correct in any case. 8)
9040 		 */
9041 		if (flags & MSG_PEEK) {
9042 			skb = skb_peek(&sk->sk_receive_queue);
9043 			if (skb)
9044 				refcount_inc(&skb->users);
9045 		} else {
9046 			skb = __skb_dequeue(&sk->sk_receive_queue);
9047 		}
9048 
9049 		if (skb)
9050 			return skb;
9051 
9052 		/* Caller is allowed not to check sk->sk_err before calling. */
9053 		error = sock_error(sk);
9054 		if (error)
9055 			goto no_packet;
9056 
9057 		if (sk->sk_shutdown & RCV_SHUTDOWN)
9058 			break;
9059 
9060 
9061 		/* User doesn't want to wait.  */
9062 		error = -EAGAIN;
9063 		if (!timeo)
9064 			goto no_packet;
9065 	} while (sctp_wait_for_packet(sk, err, &timeo) == 0);
9066 
9067 	return NULL;
9068 
9069 no_packet:
9070 	*err = error;
9071 	return NULL;
9072 }
9073 
9074 /* If sndbuf has changed, wake up per association sndbuf waiters.  */
9075 static void __sctp_write_space(struct sctp_association *asoc)
9076 {
9077 	struct sock *sk = asoc->base.sk;
9078 
9079 	if (sctp_wspace(asoc) <= 0)
9080 		return;
9081 
9082 	if (waitqueue_active(&asoc->wait))
9083 		wake_up_interruptible(&asoc->wait);
9084 
9085 	if (sctp_writeable(sk)) {
9086 		struct socket_wq *wq;
9087 
9088 		rcu_read_lock();
9089 		wq = rcu_dereference(sk->sk_wq);
9090 		if (wq) {
9091 			if (waitqueue_active(&wq->wait))
9092 				wake_up_interruptible(&wq->wait);
9093 
9094 			/* Note that we try to include the Async I/O support
9095 			 * here by modeling from the current TCP/UDP code.
9096 			 * We have not tested with it yet.
9097 			 */
9098 			if (!(sk->sk_shutdown & SEND_SHUTDOWN))
9099 				sock_wake_async(wq, SOCK_WAKE_SPACE, POLL_OUT);
9100 		}
9101 		rcu_read_unlock();
9102 	}
9103 }
9104 
9105 static void sctp_wake_up_waiters(struct sock *sk,
9106 				 struct sctp_association *asoc)
9107 {
9108 	struct sctp_association *tmp = asoc;
9109 
9110 	/* We do accounting for the sndbuf space per association,
9111 	 * so we only need to wake our own association.
9112 	 */
9113 	if (asoc->ep->sndbuf_policy)
9114 		return __sctp_write_space(asoc);
9115 
9116 	/* If association goes down and is just flushing its
9117 	 * outq, then just normally notify others.
9118 	 */
9119 	if (asoc->base.dead)
9120 		return sctp_write_space(sk);
9121 
9122 	/* Accounting for the sndbuf space is per socket, so we
9123 	 * need to wake up others, try to be fair and in case of
9124 	 * other associations, let them have a go first instead
9125 	 * of just doing a sctp_write_space() call.
9126 	 *
9127 	 * Note that we reach sctp_wake_up_waiters() only when
9128 	 * associations free up queued chunks, thus we are under
9129 	 * lock and the list of associations on a socket is
9130 	 * guaranteed not to change.
9131 	 */
9132 	for (tmp = list_next_entry(tmp, asocs); 1;
9133 	     tmp = list_next_entry(tmp, asocs)) {
9134 		/* Manually skip the head element. */
9135 		if (&tmp->asocs == &((sctp_sk(sk))->ep->asocs))
9136 			continue;
9137 		/* Wake up association. */
9138 		__sctp_write_space(tmp);
9139 		/* We've reached the end. */
9140 		if (tmp == asoc)
9141 			break;
9142 	}
9143 }
9144 
9145 /* Do accounting for the sndbuf space.
9146  * Decrement the used sndbuf space of the corresponding association by the
9147  * data size which was just transmitted(freed).
9148  */
9149 static void sctp_wfree(struct sk_buff *skb)
9150 {
9151 	struct sctp_chunk *chunk = skb_shinfo(skb)->destructor_arg;
9152 	struct sctp_association *asoc = chunk->asoc;
9153 	struct sock *sk = asoc->base.sk;
9154 
9155 	sk_mem_uncharge(sk, skb->truesize);
9156 	sk_wmem_queued_add(sk, -(skb->truesize + sizeof(struct sctp_chunk)));
9157 	asoc->sndbuf_used -= skb->truesize + sizeof(struct sctp_chunk);
9158 	WARN_ON(refcount_sub_and_test(sizeof(struct sctp_chunk),
9159 				      &sk->sk_wmem_alloc));
9160 
9161 	if (chunk->shkey) {
9162 		struct sctp_shared_key *shkey = chunk->shkey;
9163 
9164 		/* refcnt == 2 and !list_empty mean after this release, it's
9165 		 * not being used anywhere, and it's time to notify userland
9166 		 * that this shkey can be freed if it's been deactivated.
9167 		 */
9168 		if (shkey->deactivated && !list_empty(&shkey->key_list) &&
9169 		    refcount_read(&shkey->refcnt) == 2) {
9170 			struct sctp_ulpevent *ev;
9171 
9172 			ev = sctp_ulpevent_make_authkey(asoc, shkey->key_id,
9173 							SCTP_AUTH_FREE_KEY,
9174 							GFP_KERNEL);
9175 			if (ev)
9176 				asoc->stream.si->enqueue_event(&asoc->ulpq, ev);
9177 		}
9178 		sctp_auth_shkey_release(chunk->shkey);
9179 	}
9180 
9181 	sock_wfree(skb);
9182 	sctp_wake_up_waiters(sk, asoc);
9183 
9184 	sctp_association_put(asoc);
9185 }
9186 
9187 /* Do accounting for the receive space on the socket.
9188  * Accounting for the association is done in ulpevent.c
9189  * We set this as a destructor for the cloned data skbs so that
9190  * accounting is done at the correct time.
9191  */
9192 void sctp_sock_rfree(struct sk_buff *skb)
9193 {
9194 	struct sock *sk = skb->sk;
9195 	struct sctp_ulpevent *event = sctp_skb2event(skb);
9196 
9197 	atomic_sub(event->rmem_len, &sk->sk_rmem_alloc);
9198 
9199 	/*
9200 	 * Mimic the behavior of sock_rfree
9201 	 */
9202 	sk_mem_uncharge(sk, event->rmem_len);
9203 }
9204 
9205 
9206 /* Helper function to wait for space in the sndbuf.  */
9207 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
9208 				size_t msg_len)
9209 {
9210 	struct sock *sk = asoc->base.sk;
9211 	long current_timeo = *timeo_p;
9212 	DEFINE_WAIT(wait);
9213 	int err = 0;
9214 
9215 	pr_debug("%s: asoc:%p, timeo:%ld, msg_len:%zu\n", __func__, asoc,
9216 		 *timeo_p, msg_len);
9217 
9218 	/* Increment the association's refcnt.  */
9219 	sctp_association_hold(asoc);
9220 
9221 	/* Wait on the association specific sndbuf space. */
9222 	for (;;) {
9223 		prepare_to_wait_exclusive(&asoc->wait, &wait,
9224 					  TASK_INTERRUPTIBLE);
9225 		if (asoc->base.dead)
9226 			goto do_dead;
9227 		if (!*timeo_p)
9228 			goto do_nonblock;
9229 		if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING)
9230 			goto do_error;
9231 		if (signal_pending(current))
9232 			goto do_interrupted;
9233 		if ((int)msg_len <= sctp_wspace(asoc) &&
9234 		    sk_wmem_schedule(sk, msg_len))
9235 			break;
9236 
9237 		/* Let another process have a go.  Since we are going
9238 		 * to sleep anyway.
9239 		 */
9240 		release_sock(sk);
9241 		current_timeo = schedule_timeout(current_timeo);
9242 		lock_sock(sk);
9243 		if (sk != asoc->base.sk)
9244 			goto do_error;
9245 
9246 		*timeo_p = current_timeo;
9247 	}
9248 
9249 out:
9250 	finish_wait(&asoc->wait, &wait);
9251 
9252 	/* Release the association's refcnt.  */
9253 	sctp_association_put(asoc);
9254 
9255 	return err;
9256 
9257 do_dead:
9258 	err = -ESRCH;
9259 	goto out;
9260 
9261 do_error:
9262 	err = -EPIPE;
9263 	goto out;
9264 
9265 do_interrupted:
9266 	err = sock_intr_errno(*timeo_p);
9267 	goto out;
9268 
9269 do_nonblock:
9270 	err = -EAGAIN;
9271 	goto out;
9272 }
9273 
9274 void sctp_data_ready(struct sock *sk)
9275 {
9276 	struct socket_wq *wq;
9277 
9278 	trace_sk_data_ready(sk);
9279 
9280 	rcu_read_lock();
9281 	wq = rcu_dereference(sk->sk_wq);
9282 	if (skwq_has_sleeper(wq))
9283 		wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN |
9284 						EPOLLRDNORM | EPOLLRDBAND);
9285 	sk_wake_async_rcu(sk, SOCK_WAKE_WAITD, POLL_IN);
9286 	rcu_read_unlock();
9287 }
9288 
9289 /* If socket sndbuf has changed, wake up all per association waiters.  */
9290 void sctp_write_space(struct sock *sk)
9291 {
9292 	struct sctp_association *asoc;
9293 
9294 	/* Wake up the tasks in each wait queue.  */
9295 	list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) {
9296 		__sctp_write_space(asoc);
9297 	}
9298 }
9299 
9300 /* Is there any sndbuf space available on the socket?
9301  *
9302  * Note that sk_wmem_alloc is the sum of the send buffers on all of the
9303  * associations on the same socket.  For a UDP-style socket with
9304  * multiple associations, it is possible for it to be "unwriteable"
9305  * prematurely.  I assume that this is acceptable because
9306  * a premature "unwriteable" is better than an accidental "writeable" which
9307  * would cause an unwanted block under certain circumstances.  For the 1-1
9308  * UDP-style sockets or TCP-style sockets, this code should work.
9309  *  - Daisy
9310  */
9311 static bool sctp_writeable(const struct sock *sk)
9312 {
9313 	return READ_ONCE(sk->sk_sndbuf) > READ_ONCE(sk->sk_wmem_queued);
9314 }
9315 
9316 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
9317  * returns immediately with EINPROGRESS.
9318  */
9319 static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p)
9320 {
9321 	struct sock *sk = asoc->base.sk;
9322 	int err = 0;
9323 	long current_timeo = *timeo_p;
9324 	DEFINE_WAIT(wait);
9325 
9326 	pr_debug("%s: asoc:%p, timeo:%ld\n", __func__, asoc, *timeo_p);
9327 
9328 	/* Increment the association's refcnt.  */
9329 	sctp_association_hold(asoc);
9330 
9331 	for (;;) {
9332 		prepare_to_wait_exclusive(&asoc->wait, &wait,
9333 					  TASK_INTERRUPTIBLE);
9334 		if (!*timeo_p)
9335 			goto do_nonblock;
9336 		if (sk->sk_shutdown & RCV_SHUTDOWN)
9337 			break;
9338 		if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
9339 		    asoc->base.dead)
9340 			goto do_error;
9341 		if (signal_pending(current))
9342 			goto do_interrupted;
9343 
9344 		if (sctp_state(asoc, ESTABLISHED))
9345 			break;
9346 
9347 		/* Let another process have a go.  Since we are going
9348 		 * to sleep anyway.
9349 		 */
9350 		release_sock(sk);
9351 		current_timeo = schedule_timeout(current_timeo);
9352 		lock_sock(sk);
9353 
9354 		*timeo_p = current_timeo;
9355 	}
9356 
9357 out:
9358 	finish_wait(&asoc->wait, &wait);
9359 
9360 	/* Release the association's refcnt.  */
9361 	sctp_association_put(asoc);
9362 
9363 	return err;
9364 
9365 do_error:
9366 	if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
9367 		err = -ETIMEDOUT;
9368 	else
9369 		err = -ECONNREFUSED;
9370 	goto out;
9371 
9372 do_interrupted:
9373 	err = sock_intr_errno(*timeo_p);
9374 	goto out;
9375 
9376 do_nonblock:
9377 	err = -EINPROGRESS;
9378 	goto out;
9379 }
9380 
9381 static int sctp_wait_for_accept(struct sock *sk, long timeo)
9382 {
9383 	struct sctp_endpoint *ep;
9384 	int err = 0;
9385 	DEFINE_WAIT(wait);
9386 
9387 	ep = sctp_sk(sk)->ep;
9388 
9389 
9390 	for (;;) {
9391 		prepare_to_wait_exclusive(sk_sleep(sk), &wait,
9392 					  TASK_INTERRUPTIBLE);
9393 
9394 		if (list_empty(&ep->asocs)) {
9395 			release_sock(sk);
9396 			timeo = schedule_timeout(timeo);
9397 			lock_sock(sk);
9398 		}
9399 
9400 		err = -EINVAL;
9401 		if (!sctp_sstate(sk, LISTENING) ||
9402 		    (sk->sk_shutdown & RCV_SHUTDOWN))
9403 			break;
9404 
9405 		err = 0;
9406 		if (!list_empty(&ep->asocs))
9407 			break;
9408 
9409 		err = sock_intr_errno(timeo);
9410 		if (signal_pending(current))
9411 			break;
9412 
9413 		err = -EAGAIN;
9414 		if (!timeo)
9415 			break;
9416 	}
9417 
9418 	finish_wait(sk_sleep(sk), &wait);
9419 
9420 	return err;
9421 }
9422 
9423 static void sctp_wait_for_close(struct sock *sk, long timeout)
9424 {
9425 	DEFINE_WAIT(wait);
9426 
9427 	do {
9428 		prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
9429 		if (list_empty(&sctp_sk(sk)->ep->asocs))
9430 			break;
9431 		release_sock(sk);
9432 		timeout = schedule_timeout(timeout);
9433 		lock_sock(sk);
9434 	} while (!signal_pending(current) && timeout);
9435 
9436 	finish_wait(sk_sleep(sk), &wait);
9437 }
9438 
9439 static void sctp_skb_set_owner_r_frag(struct sk_buff *skb, struct sock *sk)
9440 {
9441 	struct sk_buff *frag;
9442 
9443 	if (!skb->data_len)
9444 		goto done;
9445 
9446 	/* Don't forget the fragments. */
9447 	skb_walk_frags(skb, frag)
9448 		sctp_skb_set_owner_r_frag(frag, sk);
9449 
9450 done:
9451 	sctp_skb_set_owner_r(skb, sk);
9452 }
9453 
9454 void sctp_copy_sock(struct sock *newsk, struct sock *sk,
9455 		    struct sctp_association *asoc)
9456 {
9457 	struct inet_sock *inet = inet_sk(sk);
9458 	struct inet_sock *newinet;
9459 	struct sctp_sock *sp = sctp_sk(sk);
9460 
9461 	newsk->sk_type = sk->sk_type;
9462 	newsk->sk_bound_dev_if = sk->sk_bound_dev_if;
9463 	newsk->sk_flags = sk->sk_flags;
9464 	newsk->sk_tsflags = sk->sk_tsflags;
9465 	newsk->sk_no_check_tx = sk->sk_no_check_tx;
9466 	newsk->sk_no_check_rx = sk->sk_no_check_rx;
9467 	newsk->sk_reuse = sk->sk_reuse;
9468 	sctp_sk(newsk)->reuse = sp->reuse;
9469 
9470 	newsk->sk_shutdown = sk->sk_shutdown;
9471 	newsk->sk_destruct = sk->sk_destruct;
9472 	newsk->sk_family = sk->sk_family;
9473 	newsk->sk_protocol = IPPROTO_SCTP;
9474 	newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
9475 	newsk->sk_sndbuf = sk->sk_sndbuf;
9476 	newsk->sk_rcvbuf = sk->sk_rcvbuf;
9477 	newsk->sk_lingertime = sk->sk_lingertime;
9478 	newsk->sk_rcvtimeo = sk->sk_rcvtimeo;
9479 	newsk->sk_sndtimeo = sk->sk_sndtimeo;
9480 	newsk->sk_rxhash = sk->sk_rxhash;
9481 
9482 	newinet = inet_sk(newsk);
9483 
9484 	/* Initialize sk's sport, dport, rcv_saddr and daddr for
9485 	 * getsockname() and getpeername()
9486 	 */
9487 	newinet->inet_sport = inet->inet_sport;
9488 	newinet->inet_saddr = inet->inet_saddr;
9489 	newinet->inet_rcv_saddr = inet->inet_rcv_saddr;
9490 	newinet->inet_dport = htons(asoc->peer.port);
9491 	newinet->pmtudisc = inet->pmtudisc;
9492 	atomic_set(&newinet->inet_id, get_random_u16());
9493 
9494 	newinet->uc_ttl = inet->uc_ttl;
9495 	inet_set_bit(MC_LOOP, newsk);
9496 	newinet->mc_ttl = 1;
9497 	newinet->mc_index = 0;
9498 	newinet->mc_list = NULL;
9499 
9500 	if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
9501 		net_enable_timestamp();
9502 
9503 	/* Set newsk security attributes from original sk and connection
9504 	 * security attribute from asoc.
9505 	 */
9506 	security_sctp_sk_clone(asoc, sk, newsk);
9507 }
9508 
9509 static inline void sctp_copy_descendant(struct sock *sk_to,
9510 					const struct sock *sk_from)
9511 {
9512 	size_t ancestor_size = sizeof(struct inet_sock);
9513 
9514 	ancestor_size += sk_from->sk_prot->obj_size;
9515 	ancestor_size -= offsetof(struct sctp_sock, pd_lobby);
9516 	__inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
9517 }
9518 
9519 /* Populate the fields of the newsk from the oldsk and migrate the assoc
9520  * and its messages to the newsk.
9521  */
9522 static int sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
9523 			     struct sctp_association *assoc,
9524 			     enum sctp_socket_type type)
9525 {
9526 	struct sctp_sock *oldsp = sctp_sk(oldsk);
9527 	struct sctp_sock *newsp = sctp_sk(newsk);
9528 	struct sctp_bind_bucket *pp; /* hash list port iterator */
9529 	struct sctp_endpoint *newep = newsp->ep;
9530 	struct sk_buff *skb, *tmp;
9531 	struct sctp_ulpevent *event;
9532 	struct sctp_bind_hashbucket *head;
9533 	int err;
9534 
9535 	/* Migrate socket buffer sizes and all the socket level options to the
9536 	 * new socket.
9537 	 */
9538 	newsk->sk_sndbuf = oldsk->sk_sndbuf;
9539 	newsk->sk_rcvbuf = oldsk->sk_rcvbuf;
9540 	/* Brute force copy old sctp opt. */
9541 	sctp_copy_descendant(newsk, oldsk);
9542 
9543 	/* Restore the ep value that was overwritten with the above structure
9544 	 * copy.
9545 	 */
9546 	newsp->ep = newep;
9547 	newsp->hmac = NULL;
9548 
9549 	/* Hook this new socket in to the bind_hash list. */
9550 	head = &sctp_port_hashtable[sctp_phashfn(sock_net(oldsk),
9551 						 inet_sk(oldsk)->inet_num)];
9552 	spin_lock_bh(&head->lock);
9553 	pp = sctp_sk(oldsk)->bind_hash;
9554 	sk_add_bind_node(newsk, &pp->owner);
9555 	sctp_sk(newsk)->bind_hash = pp;
9556 	inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num;
9557 	spin_unlock_bh(&head->lock);
9558 
9559 	/* Copy the bind_addr list from the original endpoint to the new
9560 	 * endpoint so that we can handle restarts properly
9561 	 */
9562 	err = sctp_bind_addr_dup(&newsp->ep->base.bind_addr,
9563 				 &oldsp->ep->base.bind_addr, GFP_KERNEL);
9564 	if (err)
9565 		return err;
9566 
9567 	/* New ep's auth_hmacs should be set if old ep's is set, in case
9568 	 * that net->sctp.auth_enable has been changed to 0 by users and
9569 	 * new ep's auth_hmacs couldn't be set in sctp_endpoint_init().
9570 	 */
9571 	if (oldsp->ep->auth_hmacs) {
9572 		err = sctp_auth_init_hmacs(newsp->ep, GFP_KERNEL);
9573 		if (err)
9574 			return err;
9575 	}
9576 
9577 	sctp_auto_asconf_init(newsp);
9578 
9579 	/* Move any messages in the old socket's receive queue that are for the
9580 	 * peeled off association to the new socket's receive queue.
9581 	 */
9582 	sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) {
9583 		event = sctp_skb2event(skb);
9584 		if (event->asoc == assoc) {
9585 			__skb_unlink(skb, &oldsk->sk_receive_queue);
9586 			__skb_queue_tail(&newsk->sk_receive_queue, skb);
9587 			sctp_skb_set_owner_r_frag(skb, newsk);
9588 		}
9589 	}
9590 
9591 	/* Clean up any messages pending delivery due to partial
9592 	 * delivery.   Three cases:
9593 	 * 1) No partial deliver;  no work.
9594 	 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
9595 	 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
9596 	 */
9597 	atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode);
9598 
9599 	if (atomic_read(&sctp_sk(oldsk)->pd_mode)) {
9600 		struct sk_buff_head *queue;
9601 
9602 		/* Decide which queue to move pd_lobby skbs to. */
9603 		if (assoc->ulpq.pd_mode) {
9604 			queue = &newsp->pd_lobby;
9605 		} else
9606 			queue = &newsk->sk_receive_queue;
9607 
9608 		/* Walk through the pd_lobby, looking for skbs that
9609 		 * need moved to the new socket.
9610 		 */
9611 		sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) {
9612 			event = sctp_skb2event(skb);
9613 			if (event->asoc == assoc) {
9614 				__skb_unlink(skb, &oldsp->pd_lobby);
9615 				__skb_queue_tail(queue, skb);
9616 				sctp_skb_set_owner_r_frag(skb, newsk);
9617 			}
9618 		}
9619 
9620 		/* Clear up any skbs waiting for the partial
9621 		 * delivery to finish.
9622 		 */
9623 		if (assoc->ulpq.pd_mode)
9624 			sctp_clear_pd(oldsk, NULL);
9625 
9626 	}
9627 
9628 	sctp_for_each_rx_skb(assoc, newsk, sctp_skb_set_owner_r_frag);
9629 
9630 	/* Set the type of socket to indicate that it is peeled off from the
9631 	 * original UDP-style socket or created with the accept() call on a
9632 	 * TCP-style socket..
9633 	 */
9634 	newsp->type = type;
9635 
9636 	/* Mark the new socket "in-use" by the user so that any packets
9637 	 * that may arrive on the association after we've moved it are
9638 	 * queued to the backlog.  This prevents a potential race between
9639 	 * backlog processing on the old socket and new-packet processing
9640 	 * on the new socket.
9641 	 *
9642 	 * The caller has just allocated newsk so we can guarantee that other
9643 	 * paths won't try to lock it and then oldsk.
9644 	 */
9645 	lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
9646 	sctp_for_each_tx_datachunk(assoc, true, sctp_clear_owner_w);
9647 	sctp_assoc_migrate(assoc, newsk);
9648 	sctp_for_each_tx_datachunk(assoc, false, sctp_set_owner_w);
9649 
9650 	/* If the association on the newsk is already closed before accept()
9651 	 * is called, set RCV_SHUTDOWN flag.
9652 	 */
9653 	if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP)) {
9654 		inet_sk_set_state(newsk, SCTP_SS_CLOSED);
9655 		newsk->sk_shutdown |= RCV_SHUTDOWN;
9656 	} else {
9657 		inet_sk_set_state(newsk, SCTP_SS_ESTABLISHED);
9658 	}
9659 
9660 	release_sock(newsk);
9661 
9662 	return 0;
9663 }
9664 
9665 
9666 /* This proto struct describes the ULP interface for SCTP.  */
9667 struct proto sctp_prot = {
9668 	.name        =	"SCTP",
9669 	.owner       =	THIS_MODULE,
9670 	.close       =	sctp_close,
9671 	.disconnect  =	sctp_disconnect,
9672 	.accept      =	sctp_accept,
9673 	.ioctl       =	sctp_ioctl,
9674 	.init        =	sctp_init_sock,
9675 	.destroy     =	sctp_destroy_sock,
9676 	.shutdown    =	sctp_shutdown,
9677 	.setsockopt  =	sctp_setsockopt,
9678 	.getsockopt  =	sctp_getsockopt,
9679 	.bpf_bypass_getsockopt	= sctp_bpf_bypass_getsockopt,
9680 	.sendmsg     =	sctp_sendmsg,
9681 	.recvmsg     =	sctp_recvmsg,
9682 	.bind        =	sctp_bind,
9683 	.bind_add    =  sctp_bind_add,
9684 	.backlog_rcv =	sctp_backlog_rcv,
9685 	.hash        =	sctp_hash,
9686 	.unhash      =	sctp_unhash,
9687 	.no_autobind =	true,
9688 	.obj_size    =  sizeof(struct sctp_sock),
9689 	.useroffset  =  offsetof(struct sctp_sock, subscribe),
9690 	.usersize    =  offsetof(struct sctp_sock, initmsg) -
9691 				offsetof(struct sctp_sock, subscribe) +
9692 				sizeof_field(struct sctp_sock, initmsg),
9693 	.sysctl_mem  =  sysctl_sctp_mem,
9694 	.sysctl_rmem =  sysctl_sctp_rmem,
9695 	.sysctl_wmem =  sysctl_sctp_wmem,
9696 	.memory_pressure = &sctp_memory_pressure,
9697 	.enter_memory_pressure = sctp_enter_memory_pressure,
9698 
9699 	.memory_allocated = &sctp_memory_allocated,
9700 	.per_cpu_fw_alloc = &sctp_memory_per_cpu_fw_alloc,
9701 
9702 	.sockets_allocated = &sctp_sockets_allocated,
9703 };
9704 
9705 #if IS_ENABLED(CONFIG_IPV6)
9706 
9707 static void sctp_v6_destruct_sock(struct sock *sk)
9708 {
9709 	sctp_destruct_common(sk);
9710 	inet6_sock_destruct(sk);
9711 }
9712 
9713 static int sctp_v6_init_sock(struct sock *sk)
9714 {
9715 	int ret = sctp_init_sock(sk);
9716 
9717 	if (!ret)
9718 		sk->sk_destruct = sctp_v6_destruct_sock;
9719 
9720 	return ret;
9721 }
9722 
9723 struct proto sctpv6_prot = {
9724 	.name		= "SCTPv6",
9725 	.owner		= THIS_MODULE,
9726 	.close		= sctp_close,
9727 	.disconnect	= sctp_disconnect,
9728 	.accept		= sctp_accept,
9729 	.ioctl		= sctp_ioctl,
9730 	.init		= sctp_v6_init_sock,
9731 	.destroy	= sctp_destroy_sock,
9732 	.shutdown	= sctp_shutdown,
9733 	.setsockopt	= sctp_setsockopt,
9734 	.getsockopt	= sctp_getsockopt,
9735 	.bpf_bypass_getsockopt	= sctp_bpf_bypass_getsockopt,
9736 	.sendmsg	= sctp_sendmsg,
9737 	.recvmsg	= sctp_recvmsg,
9738 	.bind		= sctp_bind,
9739 	.bind_add	= sctp_bind_add,
9740 	.backlog_rcv	= sctp_backlog_rcv,
9741 	.hash		= sctp_hash,
9742 	.unhash		= sctp_unhash,
9743 	.no_autobind	= true,
9744 	.obj_size	= sizeof(struct sctp6_sock),
9745 	.ipv6_pinfo_offset = offsetof(struct sctp6_sock, inet6),
9746 	.useroffset	= offsetof(struct sctp6_sock, sctp.subscribe),
9747 	.usersize	= offsetof(struct sctp6_sock, sctp.initmsg) -
9748 				offsetof(struct sctp6_sock, sctp.subscribe) +
9749 				sizeof_field(struct sctp6_sock, sctp.initmsg),
9750 	.sysctl_mem	= sysctl_sctp_mem,
9751 	.sysctl_rmem	= sysctl_sctp_rmem,
9752 	.sysctl_wmem	= sysctl_sctp_wmem,
9753 	.memory_pressure = &sctp_memory_pressure,
9754 	.enter_memory_pressure = sctp_enter_memory_pressure,
9755 
9756 	.memory_allocated = &sctp_memory_allocated,
9757 	.per_cpu_fw_alloc = &sctp_memory_per_cpu_fw_alloc,
9758 
9759 	.sockets_allocated = &sctp_sockets_allocated,
9760 };
9761 #endif /* IS_ENABLED(CONFIG_IPV6) */
9762