1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* AF_RXRPC implementation
3 *
4 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 */
7
8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10 #include <linux/module.h>
11 #include <linux/kernel.h>
12 #include <linux/net.h>
13 #include <linux/slab.h>
14 #include <linux/skbuff.h>
15 #include <linux/random.h>
16 #include <linux/poll.h>
17 #include <linux/proc_fs.h>
18 #include <linux/key-type.h>
19 #include <net/net_namespace.h>
20 #include <net/sock.h>
21 #include <net/af_rxrpc.h>
22 #define CREATE_TRACE_POINTS
23 #include "ar-internal.h"
24
25 MODULE_DESCRIPTION("RxRPC network protocol");
26 MODULE_AUTHOR("Red Hat, Inc.");
27 MODULE_LICENSE("GPL");
28 MODULE_ALIAS_NETPROTO(PF_RXRPC);
29
30 unsigned int rxrpc_debug; // = RXRPC_DEBUG_KPROTO;
31 module_param_named(debug, rxrpc_debug, uint, 0644);
32 MODULE_PARM_DESC(debug, "RxRPC debugging mask");
33
34 static struct proto rxrpc_proto;
35 static const struct proto_ops rxrpc_rpc_ops;
36
37 /* current debugging ID */
38 atomic_t rxrpc_debug_id;
39 EXPORT_SYMBOL(rxrpc_debug_id);
40
41 /* count of skbs currently in use */
42 atomic_t rxrpc_n_rx_skbs;
43
44 struct workqueue_struct *rxrpc_workqueue;
45
46 static void rxrpc_sock_destructor(struct sock *);
47
48 /*
49 * see if an RxRPC socket is currently writable
50 */
rxrpc_writable(struct sock * sk)51 static inline int rxrpc_writable(struct sock *sk)
52 {
53 return refcount_read(&sk->sk_wmem_alloc) < (size_t) sk->sk_sndbuf;
54 }
55
56 /*
57 * wait for write bufferage to become available
58 */
rxrpc_write_space(struct sock * sk)59 static void rxrpc_write_space(struct sock *sk)
60 {
61 _enter("%p", sk);
62 rcu_read_lock();
63 if (rxrpc_writable(sk)) {
64 struct socket_wq *wq = rcu_dereference(sk->sk_wq);
65
66 if (skwq_has_sleeper(wq))
67 wake_up_interruptible(&wq->wait);
68 sk_wake_async_rcu(sk, SOCK_WAKE_SPACE, POLL_OUT);
69 }
70 rcu_read_unlock();
71 }
72
73 /*
74 * validate an RxRPC address
75 */
rxrpc_validate_address(struct rxrpc_sock * rx,struct sockaddr_rxrpc * srx,int len)76 static int rxrpc_validate_address(struct rxrpc_sock *rx,
77 struct sockaddr_rxrpc *srx,
78 int len)
79 {
80 unsigned int tail;
81
82 if (len < sizeof(struct sockaddr_rxrpc))
83 return -EINVAL;
84
85 if (srx->srx_family != AF_RXRPC)
86 return -EAFNOSUPPORT;
87
88 if (srx->transport_type != SOCK_DGRAM)
89 return -ESOCKTNOSUPPORT;
90
91 len -= offsetof(struct sockaddr_rxrpc, transport);
92 if (srx->transport_len < sizeof(sa_family_t) ||
93 srx->transport_len > len)
94 return -EINVAL;
95
96 switch (srx->transport.family) {
97 case AF_INET:
98 if (rx->family != AF_INET &&
99 rx->family != AF_INET6)
100 return -EAFNOSUPPORT;
101 if (srx->transport_len < sizeof(struct sockaddr_in))
102 return -EINVAL;
103 tail = offsetof(struct sockaddr_rxrpc, transport.sin.__pad);
104 break;
105
106 #ifdef CONFIG_AF_RXRPC_IPV6
107 case AF_INET6:
108 if (rx->family != AF_INET6)
109 return -EAFNOSUPPORT;
110 if (srx->transport_len < sizeof(struct sockaddr_in6))
111 return -EINVAL;
112 tail = offsetof(struct sockaddr_rxrpc, transport) +
113 sizeof(struct sockaddr_in6);
114 break;
115 #endif
116
117 default:
118 return -EAFNOSUPPORT;
119 }
120
121 if (tail < len)
122 memset((void *)srx + tail, 0, len - tail);
123 _debug("INET: %pISp", &srx->transport);
124 return 0;
125 }
126
127 /*
128 * bind a local address to an RxRPC socket
129 */
rxrpc_bind(struct socket * sock,struct sockaddr_unsized * saddr,int len)130 static int rxrpc_bind(struct socket *sock, struct sockaddr_unsized *saddr, int len)
131 {
132 struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)saddr;
133 struct rxrpc_local *local;
134 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
135 u16 service_id;
136 int ret;
137
138 _enter("%p,%p,%d", rx, saddr, len);
139
140 ret = rxrpc_validate_address(rx, srx, len);
141 if (ret < 0)
142 goto error;
143 service_id = srx->srx_service;
144
145 lock_sock(&rx->sk);
146
147 switch (rx->sk.sk_state) {
148 case RXRPC_UNBOUND:
149 rx->srx = *srx;
150 local = rxrpc_lookup_local(sock_net(&rx->sk), &rx->srx);
151 if (IS_ERR(local)) {
152 ret = PTR_ERR(local);
153 goto error_unlock;
154 }
155
156 if (service_id) {
157 write_lock(&local->services_lock);
158 if (local->service)
159 goto service_in_use;
160 rx->local = local;
161 local->service = rx;
162 write_unlock(&local->services_lock);
163
164 rx->sk.sk_state = RXRPC_SERVER_BOUND;
165 } else {
166 rx->local = local;
167 rx->sk.sk_state = RXRPC_CLIENT_BOUND;
168 }
169 break;
170
171 case RXRPC_SERVER_BOUND:
172 ret = -EINVAL;
173 if (service_id == 0)
174 goto error_unlock;
175 ret = -EADDRINUSE;
176 if (service_id == rx->srx.srx_service)
177 goto error_unlock;
178 ret = -EINVAL;
179 srx->srx_service = rx->srx.srx_service;
180 if (memcmp(srx, &rx->srx, sizeof(*srx)) != 0)
181 goto error_unlock;
182 rx->second_service = service_id;
183 rx->sk.sk_state = RXRPC_SERVER_BOUND2;
184 break;
185
186 default:
187 ret = -EINVAL;
188 goto error_unlock;
189 }
190
191 release_sock(&rx->sk);
192 _leave(" = 0");
193 return 0;
194
195 service_in_use:
196 write_unlock(&local->services_lock);
197 rxrpc_unuse_local(local, rxrpc_local_unuse_bind);
198 rxrpc_put_local(local, rxrpc_local_put_bind);
199 ret = -EADDRINUSE;
200 error_unlock:
201 release_sock(&rx->sk);
202 error:
203 _leave(" = %d", ret);
204 return ret;
205 }
206
207 /*
208 * set the number of pending calls permitted on a listening socket
209 */
rxrpc_listen(struct socket * sock,int backlog)210 static int rxrpc_listen(struct socket *sock, int backlog)
211 {
212 struct sock *sk = sock->sk;
213 struct rxrpc_sock *rx = rxrpc_sk(sk);
214 unsigned int max, old;
215 int ret;
216
217 _enter("%p,%d", rx, backlog);
218
219 lock_sock(&rx->sk);
220
221 switch (rx->sk.sk_state) {
222 case RXRPC_UNBOUND:
223 ret = -EADDRNOTAVAIL;
224 break;
225 case RXRPC_SERVER_BOUND:
226 case RXRPC_SERVER_BOUND2:
227 ASSERT(rx->local != NULL);
228 max = READ_ONCE(rxrpc_max_backlog);
229 ret = -EINVAL;
230 if (backlog == INT_MAX)
231 backlog = max;
232 else if (backlog < 0 || backlog > max)
233 break;
234 old = sk->sk_max_ack_backlog;
235 sk->sk_max_ack_backlog = backlog;
236 ret = rxrpc_service_prealloc(rx, GFP_KERNEL);
237 if (ret == 0)
238 rx->sk.sk_state = RXRPC_SERVER_LISTENING;
239 else
240 sk->sk_max_ack_backlog = old;
241 break;
242 case RXRPC_SERVER_LISTENING:
243 if (backlog == 0) {
244 rx->sk.sk_state = RXRPC_SERVER_LISTEN_DISABLED;
245 sk->sk_max_ack_backlog = 0;
246 rxrpc_discard_prealloc(rx);
247 ret = 0;
248 break;
249 }
250 fallthrough;
251 default:
252 ret = -EBUSY;
253 break;
254 }
255
256 release_sock(&rx->sk);
257 _leave(" = %d", ret);
258 return ret;
259 }
260
261 /**
262 * rxrpc_kernel_lookup_peer - Obtain remote transport endpoint for an address
263 * @sock: The socket through which it will be accessed
264 * @srx: The network address
265 * @gfp: Allocation flags
266 *
267 * Lookup or create a remote transport endpoint record for the specified
268 * address.
269 *
270 * Return: The peer record found with a reference or a negative error code if
271 * the address is invalid or unsupported.
272 */
rxrpc_kernel_lookup_peer(struct socket * sock,struct sockaddr_rxrpc * srx,gfp_t gfp)273 struct rxrpc_peer *rxrpc_kernel_lookup_peer(struct socket *sock,
274 struct sockaddr_rxrpc *srx, gfp_t gfp)
275 {
276 struct rxrpc_peer *peer;
277 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
278 int ret;
279
280 ret = rxrpc_validate_address(rx, srx, sizeof(*srx));
281 if (ret < 0)
282 return ERR_PTR(ret);
283
284 peer = rxrpc_lookup_peer(rx->local, srx, gfp);
285 return peer ?: ERR_PTR(-ENOMEM);
286 }
287 EXPORT_SYMBOL(rxrpc_kernel_lookup_peer);
288
289 /**
290 * rxrpc_kernel_get_peer - Get a reference on a peer
291 * @peer: The peer to get a reference on (may be NULL).
292 *
293 * Get a reference for a remote peer record (if not NULL).
294 *
295 * Return: The @peer argument.
296 */
rxrpc_kernel_get_peer(struct rxrpc_peer * peer)297 struct rxrpc_peer *rxrpc_kernel_get_peer(struct rxrpc_peer *peer)
298 {
299 return peer ? rxrpc_get_peer(peer, rxrpc_peer_get_application) : NULL;
300 }
301 EXPORT_SYMBOL(rxrpc_kernel_get_peer);
302
303 /**
304 * rxrpc_kernel_put_peer - Allow a kernel app to drop a peer reference
305 * @peer: The peer to drop a ref on
306 *
307 * Drop a reference on a peer record.
308 */
rxrpc_kernel_put_peer(struct rxrpc_peer * peer)309 void rxrpc_kernel_put_peer(struct rxrpc_peer *peer)
310 {
311 rxrpc_put_peer(peer, rxrpc_peer_put_application);
312 }
313 EXPORT_SYMBOL(rxrpc_kernel_put_peer);
314
315 /**
316 * rxrpc_kernel_begin_call - Allow a kernel service to begin a call
317 * @sock: The socket on which to make the call
318 * @peer: The peer to contact
319 * @key: The security context to use (defaults to socket setting)
320 * @user_call_ID: The ID to use
321 * @tx_total_len: Total length of data to transmit during the call (or -1)
322 * @hard_timeout: The maximum lifespan of the call in sec
323 * @gfp: The allocation constraints
324 * @notify_rx: Where to send notifications instead of socket queue
325 * @service_id: The ID of the service to contact
326 * @upgrade: Request service upgrade for call
327 * @interruptibility: The call is interruptible, or can be canceled.
328 * @debug_id: The debug ID for tracing to be assigned to the call
329 *
330 * Allow a kernel service to begin a call on the nominated socket. This just
331 * sets up all the internal tracking structures and allocates connection and
332 * call IDs as appropriate.
333 *
334 * The default socket destination address and security may be overridden by
335 * supplying @srx and @key.
336 *
337 * Return: The new call or an error code.
338 */
rxrpc_kernel_begin_call(struct socket * sock,struct rxrpc_peer * peer,struct key * key,unsigned long user_call_ID,s64 tx_total_len,u32 hard_timeout,gfp_t gfp,rxrpc_notify_rx_t notify_rx,u16 service_id,bool upgrade,enum rxrpc_interruptibility interruptibility,unsigned int debug_id)339 struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
340 struct rxrpc_peer *peer,
341 struct key *key,
342 unsigned long user_call_ID,
343 s64 tx_total_len,
344 u32 hard_timeout,
345 gfp_t gfp,
346 rxrpc_notify_rx_t notify_rx,
347 u16 service_id,
348 bool upgrade,
349 enum rxrpc_interruptibility interruptibility,
350 unsigned int debug_id)
351 {
352 struct rxrpc_conn_parameters cp;
353 struct rxrpc_call_params p;
354 struct rxrpc_call *call;
355 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
356
357 _enter(",,%x,%lx", key_serial(key), user_call_ID);
358
359 if (WARN_ON_ONCE(peer->local != rx->local))
360 return ERR_PTR(-EIO);
361
362 lock_sock(&rx->sk);
363
364 if (!key)
365 key = rx->key;
366 if (key && !key->payload.data[0])
367 key = NULL; /* a no-security key */
368
369 memset(&p, 0, sizeof(p));
370 p.user_call_ID = user_call_ID;
371 p.tx_total_len = tx_total_len;
372 p.interruptibility = interruptibility;
373 p.kernel = true;
374 p.timeouts.hard = hard_timeout;
375
376 memset(&cp, 0, sizeof(cp));
377 cp.local = rx->local;
378 cp.peer = peer;
379 cp.key = key;
380 cp.security_level = rx->min_sec_level;
381 cp.exclusive = false;
382 cp.upgrade = upgrade;
383 cp.service_id = service_id;
384 call = rxrpc_new_client_call(rx, &cp, &p, gfp, debug_id);
385 /* The socket has been unlocked. */
386 if (!IS_ERR(call)) {
387 call->notify_rx = notify_rx;
388 mutex_unlock(&call->user_mutex);
389 }
390
391 _leave(" = %p", call);
392 return call;
393 }
394 EXPORT_SYMBOL(rxrpc_kernel_begin_call);
395
396 /*
397 * Dummy function used to stop the notifier talking to recvmsg().
398 */
rxrpc_dummy_notify_rx(struct sock * sk,struct rxrpc_call * rxcall,unsigned long call_user_ID)399 static void rxrpc_dummy_notify_rx(struct sock *sk, struct rxrpc_call *rxcall,
400 unsigned long call_user_ID)
401 {
402 }
403
404 /**
405 * rxrpc_kernel_shutdown_call - Allow a kernel service to shut down a call it was using
406 * @sock: The socket the call is on
407 * @call: The call to end
408 *
409 * Allow a kernel service to shut down a call it was using. The call must be
410 * complete before this is called (the call should be aborted if necessary).
411 */
rxrpc_kernel_shutdown_call(struct socket * sock,struct rxrpc_call * call)412 void rxrpc_kernel_shutdown_call(struct socket *sock, struct rxrpc_call *call)
413 {
414 _enter("%d{%d}", call->debug_id, refcount_read(&call->ref));
415
416 mutex_lock(&call->user_mutex);
417 if (!test_bit(RXRPC_CALL_RELEASED, &call->flags)) {
418 rxrpc_release_call(rxrpc_sk(sock->sk), call);
419
420 /* Make sure we're not going to call back into a kernel service */
421 if (call->notify_rx) {
422 spin_lock_irq(&call->notify_lock);
423 call->notify_rx = rxrpc_dummy_notify_rx;
424 spin_unlock_irq(&call->notify_lock);
425 }
426 }
427 mutex_unlock(&call->user_mutex);
428 }
429 EXPORT_SYMBOL(rxrpc_kernel_shutdown_call);
430
431 /**
432 * rxrpc_kernel_put_call - Release a reference to a call
433 * @sock: The socket the call is on
434 * @call: The call to put
435 *
436 * Drop the application's ref on an rxrpc call.
437 */
rxrpc_kernel_put_call(struct socket * sock,struct rxrpc_call * call)438 void rxrpc_kernel_put_call(struct socket *sock, struct rxrpc_call *call)
439 {
440 rxrpc_put_call(call, rxrpc_call_put_kernel);
441 }
442 EXPORT_SYMBOL(rxrpc_kernel_put_call);
443
444 /**
445 * rxrpc_kernel_check_life - Check to see whether a call is still alive
446 * @sock: The socket the call is on
447 * @call: The call to check
448 *
449 * Allow a kernel service to find out whether a call is still alive - whether
450 * it has completed successfully and all received data has been consumed.
451 *
452 * Return: %true if the call is still ongoing and %false if it has completed.
453 */
rxrpc_kernel_check_life(const struct socket * sock,const struct rxrpc_call * call)454 bool rxrpc_kernel_check_life(const struct socket *sock,
455 const struct rxrpc_call *call)
456 {
457 if (!rxrpc_call_is_complete(call))
458 return true;
459 if (call->completion != RXRPC_CALL_SUCCEEDED)
460 return false;
461 return !skb_queue_empty(&call->recvmsg_queue);
462 }
463 EXPORT_SYMBOL(rxrpc_kernel_check_life);
464
465 /**
466 * rxrpc_kernel_set_notifications - Set table of callback operations
467 * @sock: The socket to install table upon
468 * @app_ops: Callback operation table to set
469 *
470 * Allow a kernel service to set a table of event notifications on a socket.
471 */
rxrpc_kernel_set_notifications(struct socket * sock,const struct rxrpc_kernel_ops * app_ops)472 void rxrpc_kernel_set_notifications(struct socket *sock,
473 const struct rxrpc_kernel_ops *app_ops)
474 {
475 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
476
477 rx->app_ops = app_ops;
478 }
479 EXPORT_SYMBOL(rxrpc_kernel_set_notifications);
480
481 /*
482 * connect an RxRPC socket
483 * - this just targets it at a specific destination; no actual connection
484 * negotiation takes place
485 */
rxrpc_connect(struct socket * sock,struct sockaddr_unsized * addr,int addr_len,int flags)486 static int rxrpc_connect(struct socket *sock, struct sockaddr_unsized *addr,
487 int addr_len, int flags)
488 {
489 struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)addr;
490 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
491 int ret;
492
493 _enter("%p,%p,%d,%d", rx, addr, addr_len, flags);
494
495 ret = rxrpc_validate_address(rx, srx, addr_len);
496 if (ret < 0) {
497 _leave(" = %d [bad addr]", ret);
498 return ret;
499 }
500
501 lock_sock(&rx->sk);
502
503 ret = -EISCONN;
504 if (test_bit(RXRPC_SOCK_CONNECTED, &rx->flags))
505 goto error;
506
507 switch (rx->sk.sk_state) {
508 case RXRPC_UNBOUND:
509 rx->sk.sk_state = RXRPC_CLIENT_UNBOUND;
510 break;
511 case RXRPC_CLIENT_UNBOUND:
512 case RXRPC_CLIENT_BOUND:
513 break;
514 default:
515 ret = -EBUSY;
516 goto error;
517 }
518
519 rx->connect_srx = *srx;
520 set_bit(RXRPC_SOCK_CONNECTED, &rx->flags);
521 ret = 0;
522
523 error:
524 release_sock(&rx->sk);
525 return ret;
526 }
527
528 /*
529 * send a message through an RxRPC socket
530 * - in a client this does a number of things:
531 * - finds/sets up a connection for the security specified (if any)
532 * - initiates a call (ID in control data)
533 * - ends the request phase of a call (if MSG_MORE is not set)
534 * - sends a call data packet
535 * - may send an abort (abort code in control data)
536 */
rxrpc_sendmsg(struct socket * sock,struct msghdr * m,size_t len)537 static int rxrpc_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
538 {
539 struct rxrpc_local *local;
540 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
541 int ret;
542
543 _enter(",{%d},,%zu", rx->sk.sk_state, len);
544
545 if (m->msg_flags & MSG_OOB)
546 return -EOPNOTSUPP;
547
548 if (m->msg_name) {
549 ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen);
550 if (ret < 0) {
551 _leave(" = %d [bad addr]", ret);
552 return ret;
553 }
554 }
555
556 lock_sock(&rx->sk);
557
558 switch (rx->sk.sk_state) {
559 case RXRPC_UNBOUND:
560 case RXRPC_CLIENT_UNBOUND:
561 rx->srx.srx_family = AF_RXRPC;
562 rx->srx.srx_service = 0;
563 rx->srx.transport_type = SOCK_DGRAM;
564 rx->srx.transport.family = rx->family;
565 switch (rx->family) {
566 case AF_INET:
567 rx->srx.transport_len = sizeof(struct sockaddr_in);
568 break;
569 #ifdef CONFIG_AF_RXRPC_IPV6
570 case AF_INET6:
571 rx->srx.transport_len = sizeof(struct sockaddr_in6);
572 break;
573 #endif
574 default:
575 ret = -EAFNOSUPPORT;
576 goto error_unlock;
577 }
578 local = rxrpc_lookup_local(sock_net(sock->sk), &rx->srx);
579 if (IS_ERR(local)) {
580 ret = PTR_ERR(local);
581 goto error_unlock;
582 }
583
584 rx->local = local;
585 rx->sk.sk_state = RXRPC_CLIENT_BOUND;
586 fallthrough;
587
588 case RXRPC_CLIENT_BOUND:
589 if (!m->msg_name &&
590 test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) {
591 m->msg_name = &rx->connect_srx;
592 m->msg_namelen = sizeof(rx->connect_srx);
593 }
594 fallthrough;
595 case RXRPC_SERVER_BOUND:
596 case RXRPC_SERVER_LISTENING:
597 if (m->msg_flags & MSG_OOB)
598 ret = rxrpc_sendmsg_oob(rx, m, len);
599 else
600 ret = rxrpc_do_sendmsg(rx, m, len);
601 /* The socket has been unlocked */
602 goto out;
603 default:
604 ret = -EINVAL;
605 goto error_unlock;
606 }
607
608 error_unlock:
609 release_sock(&rx->sk);
610 out:
611 _leave(" = %d", ret);
612 return ret;
613 }
614
rxrpc_sock_set_min_security_level(struct sock * sk,unsigned int val)615 int rxrpc_sock_set_min_security_level(struct sock *sk, unsigned int val)
616 {
617 if (sk->sk_state != RXRPC_UNBOUND)
618 return -EISCONN;
619 if (val > RXRPC_SECURITY_MAX)
620 return -EINVAL;
621 lock_sock(sk);
622 rxrpc_sk(sk)->min_sec_level = val;
623 release_sock(sk);
624 return 0;
625 }
626 EXPORT_SYMBOL(rxrpc_sock_set_min_security_level);
627
628 /*
629 * set RxRPC socket options
630 */
rxrpc_setsockopt(struct socket * sock,int level,int optname,sockptr_t optval,unsigned int optlen)631 static int rxrpc_setsockopt(struct socket *sock, int level, int optname,
632 sockptr_t optval, unsigned int optlen)
633 {
634 struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
635 unsigned int min_sec_level, val;
636 u16 service_upgrade[2];
637 int ret;
638
639 _enter(",%d,%d,,%d", level, optname, optlen);
640
641 lock_sock(&rx->sk);
642 ret = -EOPNOTSUPP;
643
644 if (level == SOL_RXRPC) {
645 switch (optname) {
646 case RXRPC_EXCLUSIVE_CONNECTION:
647 ret = -EINVAL;
648 if (optlen != 0)
649 goto error;
650 ret = -EISCONN;
651 if (rx->sk.sk_state != RXRPC_UNBOUND)
652 goto error;
653 rx->exclusive = true;
654 goto success;
655
656 case RXRPC_SECURITY_KEY:
657 ret = -EISCONN;
658 if (rx->sk.sk_state != RXRPC_UNBOUND)
659 goto error;
660 ret = rxrpc_request_key(rx, optval, optlen);
661 goto error;
662
663 case RXRPC_SECURITY_KEYRING:
664 ret = -EISCONN;
665 if (rx->sk.sk_state != RXRPC_UNBOUND)
666 goto error;
667 ret = rxrpc_server_keyring(rx, optval, optlen);
668 goto error;
669
670 case RXRPC_MIN_SECURITY_LEVEL:
671 ret = -EINVAL;
672 if (optlen != sizeof(unsigned int))
673 goto error;
674 ret = -EISCONN;
675 if (rx->sk.sk_state != RXRPC_UNBOUND)
676 goto error;
677 ret = copy_safe_from_sockptr(&min_sec_level,
678 sizeof(min_sec_level),
679 optval, optlen);
680 if (ret)
681 goto error;
682 ret = -EINVAL;
683 if (min_sec_level > RXRPC_SECURITY_MAX)
684 goto error;
685 rx->min_sec_level = min_sec_level;
686 goto success;
687
688 case RXRPC_UPGRADEABLE_SERVICE:
689 ret = -EINVAL;
690 if (optlen != sizeof(service_upgrade) ||
691 rx->service_upgrade.from != 0)
692 goto error;
693 ret = -EISCONN;
694 if (rx->sk.sk_state != RXRPC_SERVER_BOUND2)
695 goto error;
696 ret = -EFAULT;
697 if (copy_from_sockptr(service_upgrade, optval,
698 sizeof(service_upgrade)) != 0)
699 goto error;
700 ret = -EINVAL;
701 if ((service_upgrade[0] != rx->srx.srx_service ||
702 service_upgrade[1] != rx->second_service) &&
703 (service_upgrade[0] != rx->second_service ||
704 service_upgrade[1] != rx->srx.srx_service))
705 goto error;
706 rx->service_upgrade.from = service_upgrade[0];
707 rx->service_upgrade.to = service_upgrade[1];
708 goto success;
709
710 case RXRPC_MANAGE_RESPONSE:
711 ret = -EINVAL;
712 if (optlen != sizeof(unsigned int))
713 goto error;
714 ret = -EISCONN;
715 if (rx->sk.sk_state != RXRPC_UNBOUND)
716 goto error;
717 ret = copy_safe_from_sockptr(&val, sizeof(val),
718 optval, optlen);
719 if (ret)
720 goto error;
721 ret = -EINVAL;
722 if (val > 1)
723 goto error;
724 if (val)
725 set_bit(RXRPC_SOCK_MANAGE_RESPONSE, &rx->flags);
726 else
727 clear_bit(RXRPC_SOCK_MANAGE_RESPONSE, &rx->flags);
728 goto success;
729
730 default:
731 break;
732 }
733 }
734
735 success:
736 ret = 0;
737 error:
738 release_sock(&rx->sk);
739 return ret;
740 }
741
742 /*
743 * Get socket options.
744 */
rxrpc_getsockopt(struct socket * sock,int level,int optname,char __user * optval,int __user * _optlen)745 static int rxrpc_getsockopt(struct socket *sock, int level, int optname,
746 char __user *optval, int __user *_optlen)
747 {
748 int optlen;
749
750 if (level != SOL_RXRPC)
751 return -EOPNOTSUPP;
752
753 if (get_user(optlen, _optlen))
754 return -EFAULT;
755
756 switch (optname) {
757 case RXRPC_SUPPORTED_CMSG:
758 if (optlen < sizeof(int))
759 return -ETOOSMALL;
760 if (put_user(RXRPC__SUPPORTED - 1, (int __user *)optval) ||
761 put_user(sizeof(int), _optlen))
762 return -EFAULT;
763 return 0;
764
765 default:
766 return -EOPNOTSUPP;
767 }
768 }
769
770 /*
771 * permit an RxRPC socket to be polled
772 */
rxrpc_poll(struct file * file,struct socket * sock,poll_table * wait)773 static __poll_t rxrpc_poll(struct file *file, struct socket *sock,
774 poll_table *wait)
775 {
776 struct sock *sk = sock->sk;
777 struct rxrpc_sock *rx = rxrpc_sk(sk);
778 __poll_t mask;
779
780 sock_poll_wait(file, sock, wait);
781 mask = 0;
782
783 /* the socket is readable if there are any messages waiting on the Rx
784 * queue */
785 if (!list_empty(&rx->recvmsg_q))
786 mask |= EPOLLIN | EPOLLRDNORM;
787
788 /* the socket is writable if there is space to add new data to the
789 * socket; there is no guarantee that any particular call in progress
790 * on the socket may have space in the Tx ACK window */
791 if (rxrpc_writable(sk))
792 mask |= EPOLLOUT | EPOLLWRNORM;
793
794 return mask;
795 }
796
797 /*
798 * create an RxRPC socket
799 */
rxrpc_create(struct net * net,struct socket * sock,int protocol,int kern)800 static int rxrpc_create(struct net *net, struct socket *sock, int protocol,
801 int kern)
802 {
803 struct rxrpc_net *rxnet;
804 struct rxrpc_sock *rx;
805 struct sock *sk;
806
807 _enter("%p,%d", sock, protocol);
808
809 /* we support transport protocol UDP/UDP6 only */
810 if (protocol != PF_INET &&
811 IS_ENABLED(CONFIG_AF_RXRPC_IPV6) && protocol != PF_INET6)
812 return -EPROTONOSUPPORT;
813
814 if (sock->type != SOCK_DGRAM)
815 return -ESOCKTNOSUPPORT;
816
817 sock->ops = &rxrpc_rpc_ops;
818 sock->state = SS_UNCONNECTED;
819
820 sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto, kern);
821 if (!sk)
822 return -ENOMEM;
823
824 sock_init_data(sock, sk);
825 sock_set_flag(sk, SOCK_RCU_FREE);
826 sk->sk_state = RXRPC_UNBOUND;
827 sk->sk_write_space = rxrpc_write_space;
828 sk->sk_max_ack_backlog = 0;
829 sk->sk_destruct = rxrpc_sock_destructor;
830
831 rx = rxrpc_sk(sk);
832 rx->family = protocol;
833 rx->calls = RB_ROOT;
834
835 spin_lock_init(&rx->incoming_lock);
836 skb_queue_head_init(&rx->recvmsg_oobq);
837 rx->pending_oobq = RB_ROOT;
838 INIT_LIST_HEAD(&rx->sock_calls);
839 INIT_LIST_HEAD(&rx->to_be_accepted);
840 INIT_LIST_HEAD(&rx->recvmsg_q);
841 spin_lock_init(&rx->recvmsg_lock);
842 rwlock_init(&rx->call_lock);
843 memset(&rx->srx, 0, sizeof(rx->srx));
844
845 rxnet = rxrpc_net(sock_net(&rx->sk));
846 timer_reduce(&rxnet->peer_keepalive_timer, jiffies + 1);
847
848 _leave(" = 0 [%p]", rx);
849 return 0;
850 }
851
852 /*
853 * Kill all the calls on a socket and shut it down.
854 */
rxrpc_shutdown(struct socket * sock,int flags)855 static int rxrpc_shutdown(struct socket *sock, int flags)
856 {
857 struct sock *sk = sock->sk;
858 struct rxrpc_sock *rx = rxrpc_sk(sk);
859 int ret = 0;
860
861 _enter("%p,%d", sk, flags);
862
863 if (flags != SHUT_RDWR)
864 return -EOPNOTSUPP;
865 if (sk->sk_state == RXRPC_CLOSE)
866 return -ESHUTDOWN;
867
868 lock_sock(sk);
869
870 if (sk->sk_state < RXRPC_CLOSE) {
871 spin_lock_irq(&rx->recvmsg_lock);
872 sk->sk_state = RXRPC_CLOSE;
873 sk->sk_shutdown = SHUTDOWN_MASK;
874 spin_unlock_irq(&rx->recvmsg_lock);
875 } else {
876 ret = -ESHUTDOWN;
877 }
878
879 rxrpc_discard_prealloc(rx);
880
881 release_sock(sk);
882 return ret;
883 }
884
885 /*
886 * Purge the out-of-band queue.
887 */
rxrpc_purge_oob_queue(struct sock * sk)888 static void rxrpc_purge_oob_queue(struct sock *sk)
889 {
890 struct rxrpc_sock *rx = rxrpc_sk(sk);
891 struct sk_buff *skb;
892
893 while ((skb = skb_dequeue(&rx->recvmsg_oobq)))
894 rxrpc_kernel_free_oob(skb);
895 while (!RB_EMPTY_ROOT(&rx->pending_oobq)) {
896 skb = rb_entry(rx->pending_oobq.rb_node, struct sk_buff, rbnode);
897 rb_erase(&skb->rbnode, &rx->pending_oobq);
898 rxrpc_kernel_free_oob(skb);
899 }
900 }
901
902 /*
903 * RxRPC socket destructor
904 */
rxrpc_sock_destructor(struct sock * sk)905 static void rxrpc_sock_destructor(struct sock *sk)
906 {
907 _enter("%p", sk);
908
909 rxrpc_purge_oob_queue(sk);
910 rxrpc_purge_queue(&sk->sk_receive_queue);
911
912 WARN_ON(refcount_read(&sk->sk_wmem_alloc));
913 WARN_ON(!sk_unhashed(sk));
914 WARN_ON(sk->sk_socket);
915
916 if (!sock_flag(sk, SOCK_DEAD)) {
917 printk("Attempt to release alive rxrpc socket: %p\n", sk);
918 return;
919 }
920 }
921
922 /*
923 * release an RxRPC socket
924 */
rxrpc_release_sock(struct sock * sk)925 static int rxrpc_release_sock(struct sock *sk)
926 {
927 struct rxrpc_sock *rx = rxrpc_sk(sk);
928
929 _enter("%p{%d,%d}", sk, sk->sk_state, refcount_read(&sk->sk_refcnt));
930
931 /* declare the socket closed for business */
932 sock_orphan(sk);
933 sk->sk_shutdown = SHUTDOWN_MASK;
934
935 /* We want to kill off all connections from a service socket
936 * as fast as possible because we can't share these; client
937 * sockets, on the other hand, can share an endpoint.
938 */
939 switch (sk->sk_state) {
940 case RXRPC_SERVER_BOUND:
941 case RXRPC_SERVER_BOUND2:
942 case RXRPC_SERVER_LISTENING:
943 case RXRPC_SERVER_LISTEN_DISABLED:
944 rx->local->service_closed = true;
945 break;
946 }
947
948 spin_lock_irq(&rx->recvmsg_lock);
949 sk->sk_state = RXRPC_CLOSE;
950 spin_unlock_irq(&rx->recvmsg_lock);
951
952 if (rx->local && rx->local->service == rx) {
953 write_lock(&rx->local->services_lock);
954 rx->local->service = NULL;
955 write_unlock(&rx->local->services_lock);
956 }
957
958 /* try to flush out this socket */
959 rxrpc_discard_prealloc(rx);
960 rxrpc_release_calls_on_socket(rx);
961 flush_workqueue(rxrpc_workqueue);
962 rxrpc_purge_oob_queue(sk);
963 rxrpc_purge_queue(&sk->sk_receive_queue);
964
965 rxrpc_unuse_local(rx->local, rxrpc_local_unuse_release_sock);
966 rxrpc_put_local(rx->local, rxrpc_local_put_release_sock);
967 rx->local = NULL;
968 key_put(rx->key);
969 rx->key = NULL;
970 key_put(rx->securities);
971 rx->securities = NULL;
972 sock_put(sk);
973
974 _leave(" = 0");
975 return 0;
976 }
977
978 /*
979 * release an RxRPC BSD socket on close() or equivalent
980 */
rxrpc_release(struct socket * sock)981 static int rxrpc_release(struct socket *sock)
982 {
983 struct sock *sk = sock->sk;
984
985 _enter("%p{%p}", sock, sk);
986
987 if (!sk)
988 return 0;
989
990 sock->sk = NULL;
991
992 return rxrpc_release_sock(sk);
993 }
994
995 /*
996 * RxRPC network protocol
997 */
998 static const struct proto_ops rxrpc_rpc_ops = {
999 .family = PF_RXRPC,
1000 .owner = THIS_MODULE,
1001 .release = rxrpc_release,
1002 .bind = rxrpc_bind,
1003 .connect = rxrpc_connect,
1004 .socketpair = sock_no_socketpair,
1005 .accept = sock_no_accept,
1006 .getname = sock_no_getname,
1007 .poll = rxrpc_poll,
1008 .ioctl = sock_no_ioctl,
1009 .listen = rxrpc_listen,
1010 .shutdown = rxrpc_shutdown,
1011 .setsockopt = rxrpc_setsockopt,
1012 .getsockopt = rxrpc_getsockopt,
1013 .sendmsg = rxrpc_sendmsg,
1014 .recvmsg = rxrpc_recvmsg,
1015 .mmap = sock_no_mmap,
1016 };
1017
1018 static struct proto rxrpc_proto = {
1019 .name = "RXRPC",
1020 .owner = THIS_MODULE,
1021 .obj_size = sizeof(struct rxrpc_sock),
1022 .max_header = sizeof(struct rxrpc_wire_header),
1023 };
1024
1025 static const struct net_proto_family rxrpc_family_ops = {
1026 .family = PF_RXRPC,
1027 .create = rxrpc_create,
1028 .owner = THIS_MODULE,
1029 };
1030
1031 /*
1032 * initialise and register the RxRPC protocol
1033 */
af_rxrpc_init(void)1034 static int __init af_rxrpc_init(void)
1035 {
1036 int ret = -1;
1037
1038 BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > sizeof_field(struct sk_buff, cb));
1039
1040 ret = -ENOMEM;
1041 rxrpc_gen_version_string();
1042 rxrpc_call_jar = kmem_cache_create(
1043 "rxrpc_call_jar", sizeof(struct rxrpc_call), 0,
1044 SLAB_HWCACHE_ALIGN, NULL);
1045 if (!rxrpc_call_jar) {
1046 pr_notice("Failed to allocate call jar\n");
1047 goto error_call_jar;
1048 }
1049
1050 rxrpc_workqueue = alloc_ordered_workqueue("krxrpcd", WQ_HIGHPRI | WQ_MEM_RECLAIM);
1051 if (!rxrpc_workqueue) {
1052 pr_notice("Failed to allocate work queue\n");
1053 goto error_work_queue;
1054 }
1055
1056 ret = rxrpc_init_security();
1057 if (ret < 0) {
1058 pr_crit("Cannot initialise security\n");
1059 goto error_security;
1060 }
1061
1062 ret = register_pernet_device(&rxrpc_net_ops);
1063 if (ret)
1064 goto error_pernet;
1065
1066 ret = proto_register(&rxrpc_proto, 1);
1067 if (ret < 0) {
1068 pr_crit("Cannot register protocol\n");
1069 goto error_proto;
1070 }
1071
1072 ret = sock_register(&rxrpc_family_ops);
1073 if (ret < 0) {
1074 pr_crit("Cannot register socket family\n");
1075 goto error_sock;
1076 }
1077
1078 ret = register_key_type(&key_type_rxrpc);
1079 if (ret < 0) {
1080 pr_crit("Cannot register client key type\n");
1081 goto error_key_type;
1082 }
1083
1084 ret = register_key_type(&key_type_rxrpc_s);
1085 if (ret < 0) {
1086 pr_crit("Cannot register server key type\n");
1087 goto error_key_type_s;
1088 }
1089
1090 ret = rxrpc_sysctl_init();
1091 if (ret < 0) {
1092 pr_crit("Cannot register sysctls\n");
1093 goto error_sysctls;
1094 }
1095
1096 return 0;
1097
1098 error_sysctls:
1099 unregister_key_type(&key_type_rxrpc_s);
1100 error_key_type_s:
1101 unregister_key_type(&key_type_rxrpc);
1102 error_key_type:
1103 sock_unregister(PF_RXRPC);
1104 error_sock:
1105 proto_unregister(&rxrpc_proto);
1106 error_proto:
1107 unregister_pernet_device(&rxrpc_net_ops);
1108 error_pernet:
1109 rxrpc_exit_security();
1110 error_security:
1111 destroy_workqueue(rxrpc_workqueue);
1112 error_work_queue:
1113 kmem_cache_destroy(rxrpc_call_jar);
1114 error_call_jar:
1115 return ret;
1116 }
1117
1118 /*
1119 * unregister the RxRPC protocol
1120 */
af_rxrpc_exit(void)1121 static void __exit af_rxrpc_exit(void)
1122 {
1123 _enter("");
1124 rxrpc_sysctl_exit();
1125 unregister_key_type(&key_type_rxrpc_s);
1126 unregister_key_type(&key_type_rxrpc);
1127 sock_unregister(PF_RXRPC);
1128 proto_unregister(&rxrpc_proto);
1129 unregister_pernet_device(&rxrpc_net_ops);
1130 ASSERTCMP(atomic_read(&rxrpc_n_rx_skbs), ==, 0);
1131
1132 /* Make sure the local and peer records pinned by any dying connections
1133 * are released.
1134 */
1135 rcu_barrier();
1136
1137 destroy_workqueue(rxrpc_workqueue);
1138 rxrpc_exit_security();
1139 kmem_cache_destroy(rxrpc_call_jar);
1140 _leave("");
1141 }
1142
1143 module_init(af_rxrpc_init);
1144 module_exit(af_rxrpc_exit);
1145