1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* SCTP kernel implementation
3 * (C) Copyright IBM Corp. 2002, 2004
4 * Copyright (c) 2001 Nokia, Inc.
5 * Copyright (c) 2001 La Monte H.P. Yarroll
6 * Copyright (c) 2002-2003 Intel Corp.
7 *
8 * This file is part of the SCTP kernel implementation
9 *
10 * SCTP over IPv6.
11 *
12 * Please send any bug reports or fixes you make to the
13 * email address(es):
14 * lksctp developers <linux-sctp@vger.kernel.org>
15 *
16 * Written or modified by:
17 * Le Yanqun <yanqun.le@nokia.com>
18 * Hui Huang <hui.huang@nokia.com>
19 * La Monte H.P. Yarroll <piggy@acm.org>
20 * Sridhar Samudrala <sri@us.ibm.com>
21 * Jon Grimm <jgrimm@us.ibm.com>
22 * Ardelle Fan <ardelle.fan@intel.com>
23 *
24 * Based on:
25 * linux/net/ipv6/tcp_ipv6.c
26 */
27
28 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
29
30 #include <linux/module.h>
31 #include <linux/errno.h>
32 #include <linux/types.h>
33 #include <linux/socket.h>
34 #include <linux/sockios.h>
35 #include <linux/net.h>
36 #include <linux/in.h>
37 #include <linux/in6.h>
38 #include <linux/netdevice.h>
39 #include <linux/init.h>
40 #include <linux/ipsec.h>
41 #include <linux/slab.h>
42
43 #include <linux/ipv6.h>
44 #include <linux/icmpv6.h>
45 #include <linux/random.h>
46 #include <linux/seq_file.h>
47
48 #include <net/protocol.h>
49 #include <net/ndisc.h>
50 #include <net/ip.h>
51 #include <net/ipv6.h>
52 #include <net/transp_v6.h>
53 #include <net/addrconf.h>
54 #include <net/ip6_route.h>
55 #include <net/inet_common.h>
56 #include <net/inet_ecn.h>
57 #include <net/sctp/sctp.h>
58 #include <net/udp_tunnel.h>
59
60 #include <linux/uaccess.h>
61
62 static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
63 union sctp_addr *s2);
64 static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr,
65 __be16 port);
66 static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
67 const union sctp_addr *addr2);
68
69 /* Event handler for inet6 address addition/deletion events.
70 * The sctp_local_addr_list needs to be protocted by a spin lock since
71 * multiple notifiers (say IPv4 and IPv6) may be running at the same
72 * time and thus corrupt the list.
73 * The reader side is protected with RCU.
74 */
sctp_inet6addr_event(struct notifier_block * this,unsigned long ev,void * ptr)75 static int sctp_inet6addr_event(struct notifier_block *this, unsigned long ev,
76 void *ptr)
77 {
78 struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
79 struct sctp_sockaddr_entry *addr = NULL;
80 struct sctp_sockaddr_entry *temp;
81 struct net *net = dev_net(ifa->idev->dev);
82 int found = 0;
83
84 switch (ev) {
85 case NETDEV_UP:
86 addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
87 if (addr) {
88 addr->a.v6.sin6_family = AF_INET6;
89 addr->a.v6.sin6_addr = ifa->addr;
90 addr->a.v6.sin6_scope_id = ifa->idev->dev->ifindex;
91 addr->valid = 1;
92 spin_lock_bh(&net->sctp.local_addr_lock);
93 list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
94 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
95 spin_unlock_bh(&net->sctp.local_addr_lock);
96 }
97 break;
98 case NETDEV_DOWN:
99 spin_lock_bh(&net->sctp.local_addr_lock);
100 list_for_each_entry_safe(addr, temp,
101 &net->sctp.local_addr_list, list) {
102 if (addr->a.sa.sa_family == AF_INET6 &&
103 ipv6_addr_equal(&addr->a.v6.sin6_addr,
104 &ifa->addr) &&
105 addr->a.v6.sin6_scope_id == ifa->idev->dev->ifindex) {
106 found = 1;
107 addr->valid = 0;
108 list_del_rcu(&addr->list);
109 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
110 break;
111 }
112 }
113 spin_unlock_bh(&net->sctp.local_addr_lock);
114 if (found)
115 kfree_rcu(addr, rcu);
116 break;
117 }
118
119 return NOTIFY_DONE;
120 }
121
122 static struct notifier_block sctp_inet6addr_notifier = {
123 .notifier_call = sctp_inet6addr_event,
124 };
125
sctp_v6_err_handle(struct sctp_transport * t,struct sk_buff * skb,__u8 type,__u8 code,__u32 info)126 static void sctp_v6_err_handle(struct sctp_transport *t, struct sk_buff *skb,
127 __u8 type, __u8 code, __u32 info)
128 {
129 struct sctp_association *asoc = t->asoc;
130 struct sock *sk = asoc->base.sk;
131 int err = 0;
132
133 switch (type) {
134 case ICMPV6_PKT_TOOBIG:
135 if (ip6_sk_accept_pmtu(sk))
136 sctp_icmp_frag_needed(sk, asoc, t, info);
137 return;
138 case ICMPV6_PARAMPROB:
139 if (ICMPV6_UNK_NEXTHDR == code) {
140 sctp_icmp_proto_unreachable(sk, asoc, t);
141 return;
142 }
143 break;
144 case NDISC_REDIRECT:
145 sctp_icmp_redirect(sk, t, skb);
146 return;
147 default:
148 break;
149 }
150
151 icmpv6_err_convert(type, code, &err);
152 if (!sock_owned_by_user(sk) && inet6_test_bit(RECVERR6, sk)) {
153 sk->sk_err = err;
154 sk_error_report(sk);
155 } else {
156 WRITE_ONCE(sk->sk_err_soft, err);
157 }
158 }
159
160 /* ICMP error handler. */
sctp_v6_err(struct sk_buff * skb,struct inet6_skb_parm * opt,u8 type,u8 code,int offset,__be32 info)161 static int sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
162 u8 type, u8 code, int offset, __be32 info)
163 {
164 struct net *net = dev_net(skb->dev);
165 struct sctp_transport *transport;
166 struct sctp_association *asoc;
167 __u16 saveip, savesctp;
168 struct sock *sk;
169
170 /* Fix up skb to look at the embedded net header. */
171 saveip = skb->network_header;
172 savesctp = skb->transport_header;
173 skb_reset_network_header(skb);
174 skb_set_transport_header(skb, offset);
175 sk = sctp_err_lookup(net, AF_INET6, skb, sctp_hdr(skb), &asoc, &transport);
176 /* Put back, the original pointers. */
177 skb->network_header = saveip;
178 skb->transport_header = savesctp;
179 if (!sk) {
180 __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), ICMP6_MIB_INERRORS);
181 return -ENOENT;
182 }
183
184 sctp_v6_err_handle(transport, skb, type, code, ntohl(info));
185 sctp_err_finish(sk, transport);
186
187 return 0;
188 }
189
sctp_udp_v6_err(struct sock * sk,struct sk_buff * skb)190 int sctp_udp_v6_err(struct sock *sk, struct sk_buff *skb)
191 {
192 struct net *net = dev_net(skb->dev);
193 struct sctp_association *asoc;
194 struct sctp_transport *t;
195 struct icmp6hdr *hdr;
196 __u32 info = 0;
197
198 skb->transport_header += sizeof(struct udphdr);
199 sk = sctp_err_lookup(net, AF_INET6, skb, sctp_hdr(skb), &asoc, &t);
200 if (!sk) {
201 __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), ICMP6_MIB_INERRORS);
202 return -ENOENT;
203 }
204
205 skb->transport_header -= sizeof(struct udphdr);
206 hdr = (struct icmp6hdr *)(skb_network_header(skb) - sizeof(struct icmp6hdr));
207 if (hdr->icmp6_type == NDISC_REDIRECT) {
208 /* can't be handled without outer ip6hdr known, leave it to udpv6_err */
209 sctp_err_finish(sk, t);
210 return 0;
211 }
212 if (hdr->icmp6_type == ICMPV6_PKT_TOOBIG)
213 info = ntohl(hdr->icmp6_mtu);
214 sctp_v6_err_handle(t, skb, hdr->icmp6_type, hdr->icmp6_code, info);
215
216 sctp_err_finish(sk, t);
217 return 1;
218 }
219
sctp_v6_xmit(struct sk_buff * skb,struct sctp_transport * t)220 static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *t)
221 {
222 struct dst_entry *dst = dst_clone(t->dst);
223 struct flowi6 *fl6 = &t->fl.u.ip6;
224 struct sock *sk = skb->sk;
225 struct ipv6_pinfo *np = inet6_sk(sk);
226 __u8 tclass = np->tclass;
227 __be32 label;
228
229 pr_debug("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n", __func__, skb,
230 skb->len, &fl6->saddr, &fl6->daddr);
231
232 if (t->dscp & SCTP_DSCP_SET_MASK)
233 tclass = t->dscp & SCTP_DSCP_VAL_MASK;
234
235 if (INET_ECN_is_capable(tclass))
236 IP6_ECN_flow_xmit(sk, fl6->flowlabel);
237
238 if (!(t->param_flags & SPP_PMTUD_ENABLE))
239 skb->ignore_df = 1;
240
241 SCTP_INC_STATS(sock_net(sk), SCTP_MIB_OUTSCTPPACKS);
242
243 if (!t->encap_port || !sctp_sk(sk)->udp_port) {
244 int res;
245
246 skb_dst_set(skb, dst);
247 rcu_read_lock();
248 res = ip6_xmit(sk, skb, fl6, sk->sk_mark,
249 rcu_dereference(np->opt),
250 tclass, READ_ONCE(sk->sk_priority));
251 rcu_read_unlock();
252 return res;
253 }
254
255 if (skb_is_gso(skb))
256 skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL_CSUM;
257
258 skb->encapsulation = 1;
259 skb_reset_inner_mac_header(skb);
260 skb_reset_inner_transport_header(skb);
261 skb_set_inner_ipproto(skb, IPPROTO_SCTP);
262 label = ip6_make_flowlabel(sock_net(sk), skb, fl6->flowlabel, true, fl6);
263
264 udp_tunnel6_xmit_skb(dst, sk, skb, NULL, &fl6->saddr, &fl6->daddr,
265 tclass, ip6_dst_hoplimit(dst), label,
266 sctp_sk(sk)->udp_port, t->encap_port, false, 0);
267 return 0;
268 }
269
270 /* Returns the dst cache entry for the given source and destination ip
271 * addresses.
272 */
sctp_v6_get_dst(struct sctp_transport * t,union sctp_addr * saddr,struct flowi * fl,struct sock * sk)273 static void sctp_v6_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
274 struct flowi *fl, struct sock *sk)
275 {
276 struct sctp_association *asoc = t->asoc;
277 struct dst_entry *dst = NULL;
278 struct flowi _fl;
279 struct flowi6 *fl6 = &_fl.u.ip6;
280 struct sctp_bind_addr *bp;
281 struct ipv6_pinfo *np = inet6_sk(sk);
282 struct sctp_sockaddr_entry *laddr;
283 union sctp_addr *daddr = &t->ipaddr;
284 union sctp_addr dst_saddr;
285 struct in6_addr *final_p, final;
286 enum sctp_scope scope;
287 __u8 matchlen = 0;
288
289 memset(&_fl, 0, sizeof(_fl));
290 fl6->daddr = daddr->v6.sin6_addr;
291 fl6->fl6_dport = daddr->v6.sin6_port;
292 fl6->flowi6_proto = IPPROTO_SCTP;
293 if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
294 fl6->flowi6_oif = daddr->v6.sin6_scope_id;
295 else if (asoc)
296 fl6->flowi6_oif = asoc->base.sk->sk_bound_dev_if;
297 if (t->flowlabel & SCTP_FLOWLABEL_SET_MASK)
298 fl6->flowlabel = htonl(t->flowlabel & SCTP_FLOWLABEL_VAL_MASK);
299
300 if (inet6_test_bit(SNDFLOW, sk) &&
301 (fl6->flowlabel & IPV6_FLOWLABEL_MASK)) {
302 struct ip6_flowlabel *flowlabel;
303
304 flowlabel = fl6_sock_lookup(sk, fl6->flowlabel);
305 if (IS_ERR(flowlabel))
306 goto out;
307 fl6_sock_release(flowlabel);
308 }
309
310 pr_debug("%s: dst=%pI6 ", __func__, &fl6->daddr);
311
312 if (asoc)
313 fl6->fl6_sport = htons(asoc->base.bind_addr.port);
314
315 if (saddr) {
316 fl6->saddr = saddr->v6.sin6_addr;
317 if (!fl6->fl6_sport)
318 fl6->fl6_sport = saddr->v6.sin6_port;
319
320 pr_debug("src=%pI6 - ", &fl6->saddr);
321 }
322
323 rcu_read_lock();
324 final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
325 rcu_read_unlock();
326
327 dst = ip6_dst_lookup_flow(sock_net(sk), sk, fl6, final_p);
328 if (!asoc || saddr) {
329 t->dst = dst;
330 memcpy(fl, &_fl, sizeof(_fl));
331 goto out;
332 }
333
334 bp = &asoc->base.bind_addr;
335 scope = sctp_scope(daddr);
336 /* ip6_dst_lookup has filled in the fl6->saddr for us. Check
337 * to see if we can use it.
338 */
339 if (!IS_ERR(dst)) {
340 /* Walk through the bind address list and look for a bind
341 * address that matches the source address of the returned dst.
342 */
343 sctp_v6_to_addr(&dst_saddr, &fl6->saddr, htons(bp->port));
344 rcu_read_lock();
345 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
346 if (!laddr->valid || laddr->state == SCTP_ADDR_DEL ||
347 (laddr->state != SCTP_ADDR_SRC &&
348 !asoc->src_out_of_asoc_ok))
349 continue;
350
351 /* Do not compare against v4 addrs */
352 if ((laddr->a.sa.sa_family == AF_INET6) &&
353 (sctp_v6_cmp_addr(&dst_saddr, &laddr->a))) {
354 rcu_read_unlock();
355 t->dst = dst;
356 memcpy(fl, &_fl, sizeof(_fl));
357 goto out;
358 }
359 }
360 rcu_read_unlock();
361 /* None of the bound addresses match the source address of the
362 * dst. So release it.
363 */
364 dst_release(dst);
365 dst = NULL;
366 }
367
368 /* Walk through the bind address list and try to get the
369 * best source address for a given destination.
370 */
371 rcu_read_lock();
372 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
373 struct dst_entry *bdst;
374 __u8 bmatchlen;
375
376 if (!laddr->valid ||
377 laddr->state != SCTP_ADDR_SRC ||
378 laddr->a.sa.sa_family != AF_INET6 ||
379 scope > sctp_scope(&laddr->a))
380 continue;
381
382 fl6->saddr = laddr->a.v6.sin6_addr;
383 fl6->fl6_sport = laddr->a.v6.sin6_port;
384 final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
385 bdst = ip6_dst_lookup_flow(sock_net(sk), sk, fl6, final_p);
386
387 if (IS_ERR(bdst))
388 continue;
389
390 if (ipv6_chk_addr(dev_net(bdst->dev),
391 &laddr->a.v6.sin6_addr, bdst->dev, 1)) {
392 if (!IS_ERR_OR_NULL(dst))
393 dst_release(dst);
394 dst = bdst;
395 t->dst = dst;
396 memcpy(fl, &_fl, sizeof(_fl));
397 break;
398 }
399
400 bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a);
401 if (matchlen > bmatchlen) {
402 dst_release(bdst);
403 continue;
404 }
405
406 if (!IS_ERR_OR_NULL(dst))
407 dst_release(dst);
408 dst = bdst;
409 matchlen = bmatchlen;
410 t->dst = dst;
411 memcpy(fl, &_fl, sizeof(_fl));
412 }
413 rcu_read_unlock();
414
415 out:
416 if (!IS_ERR_OR_NULL(dst)) {
417 struct rt6_info *rt;
418
419 rt = dst_rt6_info(dst);
420 t->dst_cookie = rt6_get_cookie(rt);
421 pr_debug("rt6_dst:%pI6/%d rt6_src:%pI6\n",
422 &rt->rt6i_dst.addr, rt->rt6i_dst.plen,
423 &fl->u.ip6.saddr);
424 } else {
425 t->dst = NULL;
426 pr_debug("no route\n");
427 }
428 }
429
430 /* Returns the number of consecutive initial bits that match in the 2 ipv6
431 * addresses.
432 */
sctp_v6_addr_match_len(union sctp_addr * s1,union sctp_addr * s2)433 static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
434 union sctp_addr *s2)
435 {
436 return ipv6_addr_diff(&s1->v6.sin6_addr, &s2->v6.sin6_addr);
437 }
438
439 /* Fills in the source address(saddr) based on the destination address(daddr)
440 * and asoc's bind address list.
441 */
sctp_v6_get_saddr(struct sctp_sock * sk,struct sctp_transport * t,struct flowi * fl)442 static void sctp_v6_get_saddr(struct sctp_sock *sk,
443 struct sctp_transport *t,
444 struct flowi *fl)
445 {
446 struct flowi6 *fl6 = &fl->u.ip6;
447 union sctp_addr *saddr = &t->saddr;
448
449 pr_debug("%s: asoc:%p dst:%p\n", __func__, t->asoc, t->dst);
450
451 if (t->dst) {
452 saddr->v6.sin6_family = AF_INET6;
453 saddr->v6.sin6_addr = fl6->saddr;
454 }
455 }
456
457 /* Make a copy of all potential local addresses. */
sctp_v6_copy_addrlist(struct list_head * addrlist,struct net_device * dev)458 static void sctp_v6_copy_addrlist(struct list_head *addrlist,
459 struct net_device *dev)
460 {
461 struct inet6_dev *in6_dev;
462 struct inet6_ifaddr *ifp;
463 struct sctp_sockaddr_entry *addr;
464
465 rcu_read_lock();
466 if ((in6_dev = __in6_dev_get(dev)) == NULL) {
467 rcu_read_unlock();
468 return;
469 }
470
471 read_lock_bh(&in6_dev->lock);
472 list_for_each_entry(ifp, &in6_dev->addr_list, if_list) {
473 /* Add the address to the local list. */
474 addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
475 if (addr) {
476 addr->a.v6.sin6_family = AF_INET6;
477 addr->a.v6.sin6_addr = ifp->addr;
478 addr->a.v6.sin6_scope_id = dev->ifindex;
479 addr->valid = 1;
480 INIT_LIST_HEAD(&addr->list);
481 list_add_tail(&addr->list, addrlist);
482 }
483 }
484
485 read_unlock_bh(&in6_dev->lock);
486 rcu_read_unlock();
487 }
488
489 /* Copy over any ip options */
sctp_v6_copy_ip_options(struct sock * sk,struct sock * newsk)490 static void sctp_v6_copy_ip_options(struct sock *sk, struct sock *newsk)
491 {
492 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
493 struct ipv6_txoptions *opt;
494
495 newnp = inet6_sk(newsk);
496
497 rcu_read_lock();
498 opt = rcu_dereference(np->opt);
499 if (opt) {
500 opt = ipv6_dup_options(newsk, opt);
501 if (!opt)
502 pr_err("%s: Failed to copy ip options\n", __func__);
503 }
504 RCU_INIT_POINTER(newnp->opt, opt);
505 rcu_read_unlock();
506 }
507
508 /* Account for the IP options */
sctp_v6_ip_options_len(struct sock * sk)509 static int sctp_v6_ip_options_len(struct sock *sk)
510 {
511 struct ipv6_pinfo *np = inet6_sk(sk);
512 struct ipv6_txoptions *opt;
513 int len = 0;
514
515 rcu_read_lock();
516 opt = rcu_dereference(np->opt);
517 if (opt)
518 len = opt->opt_flen + opt->opt_nflen;
519
520 rcu_read_unlock();
521 return len;
522 }
523
524 /* Initialize a sockaddr_storage from in incoming skb. */
sctp_v6_from_skb(union sctp_addr * addr,struct sk_buff * skb,int is_saddr)525 static void sctp_v6_from_skb(union sctp_addr *addr, struct sk_buff *skb,
526 int is_saddr)
527 {
528 /* Always called on head skb, so this is safe */
529 struct sctphdr *sh = sctp_hdr(skb);
530 struct sockaddr_in6 *sa = &addr->v6;
531
532 addr->v6.sin6_family = AF_INET6;
533 addr->v6.sin6_flowinfo = 0; /* FIXME */
534 addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif;
535
536 if (is_saddr) {
537 sa->sin6_port = sh->source;
538 sa->sin6_addr = ipv6_hdr(skb)->saddr;
539 } else {
540 sa->sin6_port = sh->dest;
541 sa->sin6_addr = ipv6_hdr(skb)->daddr;
542 }
543 }
544
545 /* Initialize an sctp_addr from a socket. */
sctp_v6_from_sk(union sctp_addr * addr,struct sock * sk)546 static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk)
547 {
548 addr->v6.sin6_family = AF_INET6;
549 addr->v6.sin6_port = 0;
550 addr->v6.sin6_flowinfo = 0;
551 addr->v6.sin6_addr = sk->sk_v6_rcv_saddr;
552 addr->v6.sin6_scope_id = 0;
553 }
554
555 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
sctp_v6_to_sk_saddr(union sctp_addr * addr,struct sock * sk)556 static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
557 {
558 if (addr->sa.sa_family == AF_INET) {
559 sk->sk_v6_rcv_saddr.s6_addr32[0] = 0;
560 sk->sk_v6_rcv_saddr.s6_addr32[1] = 0;
561 sk->sk_v6_rcv_saddr.s6_addr32[2] = htonl(0x0000ffff);
562 sk->sk_v6_rcv_saddr.s6_addr32[3] =
563 addr->v4.sin_addr.s_addr;
564 } else {
565 sk->sk_v6_rcv_saddr = addr->v6.sin6_addr;
566 }
567 }
568
569 /* Initialize sk->sk_daddr from sctp_addr. */
sctp_v6_to_sk_daddr(union sctp_addr * addr,struct sock * sk)570 static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
571 {
572 if (addr->sa.sa_family == AF_INET) {
573 sk->sk_v6_daddr.s6_addr32[0] = 0;
574 sk->sk_v6_daddr.s6_addr32[1] = 0;
575 sk->sk_v6_daddr.s6_addr32[2] = htonl(0x0000ffff);
576 sk->sk_v6_daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
577 } else {
578 sk->sk_v6_daddr = addr->v6.sin6_addr;
579 }
580 }
581
582 /* Initialize a sctp_addr from an address parameter. */
sctp_v6_from_addr_param(union sctp_addr * addr,union sctp_addr_param * param,__be16 port,int iif)583 static bool sctp_v6_from_addr_param(union sctp_addr *addr,
584 union sctp_addr_param *param,
585 __be16 port, int iif)
586 {
587 if (ntohs(param->v6.param_hdr.length) < sizeof(struct sctp_ipv6addr_param))
588 return false;
589
590 addr->v6.sin6_family = AF_INET6;
591 addr->v6.sin6_port = port;
592 addr->v6.sin6_flowinfo = 0; /* BUG */
593 addr->v6.sin6_addr = param->v6.addr;
594 addr->v6.sin6_scope_id = iif;
595
596 return true;
597 }
598
599 /* Initialize an address parameter from a sctp_addr and return the length
600 * of the address parameter.
601 */
sctp_v6_to_addr_param(const union sctp_addr * addr,union sctp_addr_param * param)602 static int sctp_v6_to_addr_param(const union sctp_addr *addr,
603 union sctp_addr_param *param)
604 {
605 int length = sizeof(struct sctp_ipv6addr_param);
606
607 param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS;
608 param->v6.param_hdr.length = htons(length);
609 param->v6.addr = addr->v6.sin6_addr;
610
611 return length;
612 }
613
614 /* Initialize a sctp_addr from struct in6_addr. */
sctp_v6_to_addr(union sctp_addr * addr,struct in6_addr * saddr,__be16 port)615 static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr,
616 __be16 port)
617 {
618 addr->sa.sa_family = AF_INET6;
619 addr->v6.sin6_port = port;
620 addr->v6.sin6_flowinfo = 0;
621 addr->v6.sin6_addr = *saddr;
622 addr->v6.sin6_scope_id = 0;
623 }
624
__sctp_v6_cmp_addr(const union sctp_addr * addr1,const union sctp_addr * addr2)625 static int __sctp_v6_cmp_addr(const union sctp_addr *addr1,
626 const union sctp_addr *addr2)
627 {
628 if (addr1->sa.sa_family != addr2->sa.sa_family) {
629 if (addr1->sa.sa_family == AF_INET &&
630 addr2->sa.sa_family == AF_INET6 &&
631 ipv6_addr_v4mapped(&addr2->v6.sin6_addr) &&
632 addr2->v6.sin6_addr.s6_addr32[3] ==
633 addr1->v4.sin_addr.s_addr)
634 return 1;
635
636 if (addr2->sa.sa_family == AF_INET &&
637 addr1->sa.sa_family == AF_INET6 &&
638 ipv6_addr_v4mapped(&addr1->v6.sin6_addr) &&
639 addr1->v6.sin6_addr.s6_addr32[3] ==
640 addr2->v4.sin_addr.s_addr)
641 return 1;
642
643 return 0;
644 }
645
646 if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr))
647 return 0;
648
649 /* If this is a linklocal address, compare the scope_id. */
650 if ((ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) &&
651 addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id &&
652 addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)
653 return 0;
654
655 return 1;
656 }
657
658 /* Compare addresses exactly.
659 * v4-mapped-v6 is also in consideration.
660 */
sctp_v6_cmp_addr(const union sctp_addr * addr1,const union sctp_addr * addr2)661 static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
662 const union sctp_addr *addr2)
663 {
664 return __sctp_v6_cmp_addr(addr1, addr2) &&
665 addr1->v6.sin6_port == addr2->v6.sin6_port;
666 }
667
668 /* Initialize addr struct to INADDR_ANY. */
sctp_v6_inaddr_any(union sctp_addr * addr,__be16 port)669 static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port)
670 {
671 memset(addr, 0x00, sizeof(union sctp_addr));
672 addr->v6.sin6_family = AF_INET6;
673 addr->v6.sin6_port = port;
674 }
675
676 /* Is this a wildcard address? */
sctp_v6_is_any(const union sctp_addr * addr)677 static int sctp_v6_is_any(const union sctp_addr *addr)
678 {
679 return ipv6_addr_any(&addr->v6.sin6_addr);
680 }
681
682 /* Should this be available for binding? */
sctp_v6_available(union sctp_addr * addr,struct sctp_sock * sp)683 static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp)
684 {
685 const struct in6_addr *in6 = (const struct in6_addr *)&addr->v6.sin6_addr;
686 struct sock *sk = &sp->inet.sk;
687 struct net *net = sock_net(sk);
688 struct net_device *dev = NULL;
689 int type, res, bound_dev_if;
690
691 type = ipv6_addr_type(in6);
692 if (IPV6_ADDR_ANY == type)
693 return 1;
694 if (type == IPV6_ADDR_MAPPED) {
695 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
696 return 0;
697 sctp_v6_map_v4(addr);
698 return sctp_get_af_specific(AF_INET)->available(addr, sp);
699 }
700 if (!(type & IPV6_ADDR_UNICAST))
701 return 0;
702
703 rcu_read_lock();
704 bound_dev_if = READ_ONCE(sk->sk_bound_dev_if);
705 if (bound_dev_if) {
706 res = 0;
707 dev = dev_get_by_index_rcu(net, bound_dev_if);
708 if (!dev)
709 goto out;
710 }
711
712 res = ipv6_can_nonlocal_bind(net, &sp->inet) ||
713 ipv6_chk_addr(net, in6, dev, 0);
714
715 out:
716 rcu_read_unlock();
717 return res;
718 }
719
720 /* This function checks if the address is a valid address to be used for
721 * SCTP.
722 *
723 * Output:
724 * Return 0 - If the address is a non-unicast or an illegal address.
725 * Return 1 - If the address is a unicast.
726 */
sctp_v6_addr_valid(union sctp_addr * addr,struct sctp_sock * sp,const struct sk_buff * skb)727 static int sctp_v6_addr_valid(union sctp_addr *addr,
728 struct sctp_sock *sp,
729 const struct sk_buff *skb)
730 {
731 int ret = ipv6_addr_type(&addr->v6.sin6_addr);
732
733 /* Support v4-mapped-v6 address. */
734 if (ret == IPV6_ADDR_MAPPED) {
735 /* Note: This routine is used in input, so v4-mapped-v6
736 * are disallowed here when there is no sctp_sock.
737 */
738 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
739 return 0;
740 sctp_v6_map_v4(addr);
741 return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb);
742 }
743
744 /* Is this a non-unicast address */
745 if (!(ret & IPV6_ADDR_UNICAST))
746 return 0;
747
748 return 1;
749 }
750
751 /* What is the scope of 'addr'? */
sctp_v6_scope(union sctp_addr * addr)752 static enum sctp_scope sctp_v6_scope(union sctp_addr *addr)
753 {
754 enum sctp_scope retval;
755 int v6scope;
756
757 /* The IPv6 scope is really a set of bit fields.
758 * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope.
759 */
760
761 v6scope = ipv6_addr_scope(&addr->v6.sin6_addr);
762 switch (v6scope) {
763 case IFA_HOST:
764 retval = SCTP_SCOPE_LOOPBACK;
765 break;
766 case IFA_LINK:
767 retval = SCTP_SCOPE_LINK;
768 break;
769 case IFA_SITE:
770 retval = SCTP_SCOPE_PRIVATE;
771 break;
772 default:
773 retval = SCTP_SCOPE_GLOBAL;
774 break;
775 }
776
777 return retval;
778 }
779
780 /* Create and initialize a new sk for the socket to be returned by accept(). */
sctp_v6_create_accept_sk(struct sock * sk,struct sctp_association * asoc,bool kern)781 static struct sock *sctp_v6_create_accept_sk(struct sock *sk,
782 struct sctp_association *asoc,
783 bool kern)
784 {
785 struct sock *newsk;
786 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
787 struct sctp6_sock *newsctp6sk;
788
789 newsk = sk_alloc(sock_net(sk), PF_INET6, GFP_KERNEL, sk->sk_prot, kern);
790 if (!newsk)
791 goto out;
792
793 sock_init_data(NULL, newsk);
794
795 sctp_copy_sock(newsk, sk, asoc);
796 sock_reset_flag(sk, SOCK_ZAPPED);
797
798 newsctp6sk = (struct sctp6_sock *)newsk;
799 inet_sk(newsk)->pinet6 = &newsctp6sk->inet6;
800
801 sctp_sk(newsk)->v4mapped = sctp_sk(sk)->v4mapped;
802
803 newnp = inet6_sk(newsk);
804
805 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
806 newnp->ipv6_mc_list = NULL;
807 newnp->ipv6_ac_list = NULL;
808 newnp->ipv6_fl_list = NULL;
809
810 sctp_v6_copy_ip_options(sk, newsk);
811
812 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
813 * and getpeername().
814 */
815 sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);
816
817 newsk->sk_v6_rcv_saddr = sk->sk_v6_rcv_saddr;
818
819 if (newsk->sk_prot->init(newsk)) {
820 sk_common_release(newsk);
821 newsk = NULL;
822 }
823
824 out:
825 return newsk;
826 }
827
828 /* Format a sockaddr for return to user space. This makes sure the return is
829 * AF_INET or AF_INET6 depending on the SCTP_I_WANT_MAPPED_V4_ADDR option.
830 */
sctp_v6_addr_to_user(struct sctp_sock * sp,union sctp_addr * addr)831 static int sctp_v6_addr_to_user(struct sctp_sock *sp, union sctp_addr *addr)
832 {
833 if (sp->v4mapped) {
834 if (addr->sa.sa_family == AF_INET)
835 sctp_v4_map_v6(addr);
836 } else {
837 if (addr->sa.sa_family == AF_INET6 &&
838 ipv6_addr_v4mapped(&addr->v6.sin6_addr))
839 sctp_v6_map_v4(addr);
840 }
841
842 if (addr->sa.sa_family == AF_INET) {
843 memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero));
844 return sizeof(struct sockaddr_in);
845 }
846 return sizeof(struct sockaddr_in6);
847 }
848
849 /* Where did this skb come from? */
sctp_v6_skb_iif(const struct sk_buff * skb)850 static int sctp_v6_skb_iif(const struct sk_buff *skb)
851 {
852 return inet6_iif(skb);
853 }
854
sctp_v6_skb_sdif(const struct sk_buff * skb)855 static int sctp_v6_skb_sdif(const struct sk_buff *skb)
856 {
857 return inet6_sdif(skb);
858 }
859
860 /* Was this packet marked by Explicit Congestion Notification? */
sctp_v6_is_ce(const struct sk_buff * skb)861 static int sctp_v6_is_ce(const struct sk_buff *skb)
862 {
863 return *((__u32 *)(ipv6_hdr(skb))) & (__force __u32)htonl(1 << 20);
864 }
865
866 /* Dump the v6 addr to the seq file. */
sctp_v6_seq_dump_addr(struct seq_file * seq,union sctp_addr * addr)867 static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
868 {
869 seq_printf(seq, "%pI6 ", &addr->v6.sin6_addr);
870 }
871
sctp_v6_ecn_capable(struct sock * sk)872 static void sctp_v6_ecn_capable(struct sock *sk)
873 {
874 inet6_sk(sk)->tclass |= INET_ECN_ECT_0;
875 }
876
877 /* Initialize a PF_INET msgname from a ulpevent. */
sctp_inet6_event_msgname(struct sctp_ulpevent * event,char * msgname,int * addrlen)878 static void sctp_inet6_event_msgname(struct sctp_ulpevent *event,
879 char *msgname, int *addrlen)
880 {
881 union sctp_addr *addr;
882 struct sctp_association *asoc;
883 union sctp_addr *paddr;
884
885 if (!msgname)
886 return;
887
888 addr = (union sctp_addr *)msgname;
889 asoc = event->asoc;
890 paddr = &asoc->peer.primary_addr;
891
892 if (paddr->sa.sa_family == AF_INET) {
893 addr->v4.sin_family = AF_INET;
894 addr->v4.sin_port = htons(asoc->peer.port);
895 addr->v4.sin_addr = paddr->v4.sin_addr;
896 } else {
897 addr->v6.sin6_family = AF_INET6;
898 addr->v6.sin6_flowinfo = 0;
899 if (ipv6_addr_type(&paddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
900 addr->v6.sin6_scope_id = paddr->v6.sin6_scope_id;
901 else
902 addr->v6.sin6_scope_id = 0;
903 addr->v6.sin6_port = htons(asoc->peer.port);
904 addr->v6.sin6_addr = paddr->v6.sin6_addr;
905 }
906
907 *addrlen = sctp_v6_addr_to_user(sctp_sk(asoc->base.sk), addr);
908 }
909
910 /* Initialize a msg_name from an inbound skb. */
sctp_inet6_skb_msgname(struct sk_buff * skb,char * msgname,int * addr_len)911 static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname,
912 int *addr_len)
913 {
914 union sctp_addr *addr;
915 struct sctphdr *sh;
916
917 if (!msgname)
918 return;
919
920 addr = (union sctp_addr *)msgname;
921 sh = sctp_hdr(skb);
922
923 if (ip_hdr(skb)->version == 4) {
924 addr->v4.sin_family = AF_INET;
925 addr->v4.sin_port = sh->source;
926 addr->v4.sin_addr.s_addr = ip_hdr(skb)->saddr;
927 } else {
928 addr->v6.sin6_family = AF_INET6;
929 addr->v6.sin6_flowinfo = 0;
930 addr->v6.sin6_port = sh->source;
931 addr->v6.sin6_addr = ipv6_hdr(skb)->saddr;
932 if (ipv6_addr_type(&addr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
933 addr->v6.sin6_scope_id = sctp_v6_skb_iif(skb);
934 else
935 addr->v6.sin6_scope_id = 0;
936 }
937
938 *addr_len = sctp_v6_addr_to_user(sctp_sk(skb->sk), addr);
939 }
940
941 /* Do we support this AF? */
sctp_inet6_af_supported(sa_family_t family,struct sctp_sock * sp)942 static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp)
943 {
944 switch (family) {
945 case AF_INET6:
946 return 1;
947 /* v4-mapped-v6 addresses */
948 case AF_INET:
949 if (!ipv6_only_sock(sctp_opt2sk(sp)))
950 return 1;
951 fallthrough;
952 default:
953 return 0;
954 }
955 }
956
957 /* Address matching with wildcards allowed. This extra level
958 * of indirection lets us choose whether a PF_INET6 should
959 * disallow any v4 addresses if we so choose.
960 */
sctp_inet6_cmp_addr(const union sctp_addr * addr1,const union sctp_addr * addr2,struct sctp_sock * opt)961 static int sctp_inet6_cmp_addr(const union sctp_addr *addr1,
962 const union sctp_addr *addr2,
963 struct sctp_sock *opt)
964 {
965 struct sock *sk = sctp_opt2sk(opt);
966 struct sctp_af *af1, *af2;
967
968 af1 = sctp_get_af_specific(addr1->sa.sa_family);
969 af2 = sctp_get_af_specific(addr2->sa.sa_family);
970
971 if (!af1 || !af2)
972 return 0;
973
974 /* If the socket is IPv6 only, v4 addrs will not match */
975 if (ipv6_only_sock(sk) && af1 != af2)
976 return 0;
977
978 /* Today, wildcard AF_INET/AF_INET6. */
979 if (sctp_is_any(sk, addr1) || sctp_is_any(sk, addr2))
980 return 1;
981
982 if (addr1->sa.sa_family == AF_INET && addr2->sa.sa_family == AF_INET)
983 return addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr;
984
985 return __sctp_v6_cmp_addr(addr1, addr2);
986 }
987
988 /* Verify that the provided sockaddr looks bindable. Common verification,
989 * has already been taken care of.
990 */
sctp_inet6_bind_verify(struct sctp_sock * opt,union sctp_addr * addr)991 static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
992 {
993 struct sctp_af *af;
994
995 /* ASSERT: address family has already been verified. */
996 if (addr->sa.sa_family != AF_INET6)
997 af = sctp_get_af_specific(addr->sa.sa_family);
998 else {
999 int type = ipv6_addr_type(&addr->v6.sin6_addr);
1000 struct net_device *dev;
1001
1002 if (type & IPV6_ADDR_LINKLOCAL) {
1003 struct net *net;
1004 if (!addr->v6.sin6_scope_id)
1005 return 0;
1006 net = sock_net(&opt->inet.sk);
1007 rcu_read_lock();
1008 dev = dev_get_by_index_rcu(net, addr->v6.sin6_scope_id);
1009 if (!dev || !(ipv6_can_nonlocal_bind(net, &opt->inet) ||
1010 ipv6_chk_addr(net, &addr->v6.sin6_addr,
1011 dev, 0))) {
1012 rcu_read_unlock();
1013 return 0;
1014 }
1015 rcu_read_unlock();
1016 }
1017
1018 af = opt->pf->af;
1019 }
1020 return af->available(addr, opt);
1021 }
1022
1023 /* Verify that the provided sockaddr looks sendable. Common verification,
1024 * has already been taken care of.
1025 */
sctp_inet6_send_verify(struct sctp_sock * opt,union sctp_addr * addr)1026 static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
1027 {
1028 struct sctp_af *af = NULL;
1029
1030 /* ASSERT: address family has already been verified. */
1031 if (addr->sa.sa_family != AF_INET6)
1032 af = sctp_get_af_specific(addr->sa.sa_family);
1033 else {
1034 int type = ipv6_addr_type(&addr->v6.sin6_addr);
1035 struct net_device *dev;
1036
1037 if (type & IPV6_ADDR_LINKLOCAL) {
1038 if (!addr->v6.sin6_scope_id)
1039 return 0;
1040 rcu_read_lock();
1041 dev = dev_get_by_index_rcu(sock_net(&opt->inet.sk),
1042 addr->v6.sin6_scope_id);
1043 rcu_read_unlock();
1044 if (!dev)
1045 return 0;
1046 }
1047 af = opt->pf->af;
1048 }
1049
1050 return af != NULL;
1051 }
1052
1053 /* Fill in Supported Address Type information for INIT and INIT-ACK
1054 * chunks. Note: In the future, we may want to look at sock options
1055 * to determine whether a PF_INET6 socket really wants to have IPV4
1056 * addresses.
1057 * Returns number of addresses supported.
1058 */
sctp_inet6_supported_addrs(const struct sctp_sock * opt,__be16 * types)1059 static int sctp_inet6_supported_addrs(const struct sctp_sock *opt,
1060 __be16 *types)
1061 {
1062 types[0] = SCTP_PARAM_IPV6_ADDRESS;
1063 if (!opt || !ipv6_only_sock(sctp_opt2sk(opt))) {
1064 types[1] = SCTP_PARAM_IPV4_ADDRESS;
1065 return 2;
1066 }
1067 return 1;
1068 }
1069
1070 /* Handle SCTP_I_WANT_MAPPED_V4_ADDR for getpeername() and getsockname() */
sctp_getname(struct socket * sock,struct sockaddr * uaddr,int peer)1071 static int sctp_getname(struct socket *sock, struct sockaddr *uaddr,
1072 int peer)
1073 {
1074 int rc;
1075
1076 rc = inet6_getname(sock, uaddr, peer);
1077
1078 if (rc < 0)
1079 return rc;
1080
1081 rc = sctp_v6_addr_to_user(sctp_sk(sock->sk),
1082 (union sctp_addr *)uaddr);
1083
1084 return rc;
1085 }
1086
1087 static const struct proto_ops inet6_seqpacket_ops = {
1088 .family = PF_INET6,
1089 .owner = THIS_MODULE,
1090 .release = inet6_release,
1091 .bind = inet6_bind,
1092 .connect = sctp_inet_connect,
1093 .socketpair = sock_no_socketpair,
1094 .accept = inet_accept,
1095 .getname = sctp_getname,
1096 .poll = sctp_poll,
1097 .ioctl = inet6_ioctl,
1098 .gettstamp = sock_gettstamp,
1099 .listen = sctp_inet_listen,
1100 .shutdown = inet_shutdown,
1101 .setsockopt = sock_common_setsockopt,
1102 .getsockopt = sock_common_getsockopt,
1103 .sendmsg = inet_sendmsg,
1104 .recvmsg = inet_recvmsg,
1105 .mmap = sock_no_mmap,
1106 #ifdef CONFIG_COMPAT
1107 .compat_ioctl = inet6_compat_ioctl,
1108 #endif
1109 };
1110
1111 static struct inet_protosw sctpv6_seqpacket_protosw = {
1112 .type = SOCK_SEQPACKET,
1113 .protocol = IPPROTO_SCTP,
1114 .prot = &sctpv6_prot,
1115 .ops = &inet6_seqpacket_ops,
1116 .flags = SCTP_PROTOSW_FLAG
1117 };
1118 static struct inet_protosw sctpv6_stream_protosw = {
1119 .type = SOCK_STREAM,
1120 .protocol = IPPROTO_SCTP,
1121 .prot = &sctpv6_prot,
1122 .ops = &inet6_seqpacket_ops,
1123 .flags = SCTP_PROTOSW_FLAG,
1124 };
1125
sctp6_rcv(struct sk_buff * skb)1126 static int sctp6_rcv(struct sk_buff *skb)
1127 {
1128 SCTP_INPUT_CB(skb)->encap_port = 0;
1129 return sctp_rcv(skb) ? -1 : 0;
1130 }
1131
1132 static const struct inet6_protocol sctpv6_protocol = {
1133 .handler = sctp6_rcv,
1134 .err_handler = sctp_v6_err,
1135 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1136 };
1137
1138 static struct sctp_af sctp_af_inet6 = {
1139 .sa_family = AF_INET6,
1140 .sctp_xmit = sctp_v6_xmit,
1141 .setsockopt = ipv6_setsockopt,
1142 .getsockopt = ipv6_getsockopt,
1143 .get_dst = sctp_v6_get_dst,
1144 .get_saddr = sctp_v6_get_saddr,
1145 .copy_addrlist = sctp_v6_copy_addrlist,
1146 .from_skb = sctp_v6_from_skb,
1147 .from_sk = sctp_v6_from_sk,
1148 .from_addr_param = sctp_v6_from_addr_param,
1149 .to_addr_param = sctp_v6_to_addr_param,
1150 .cmp_addr = sctp_v6_cmp_addr,
1151 .scope = sctp_v6_scope,
1152 .addr_valid = sctp_v6_addr_valid,
1153 .inaddr_any = sctp_v6_inaddr_any,
1154 .is_any = sctp_v6_is_any,
1155 .available = sctp_v6_available,
1156 .skb_iif = sctp_v6_skb_iif,
1157 .skb_sdif = sctp_v6_skb_sdif,
1158 .is_ce = sctp_v6_is_ce,
1159 .seq_dump_addr = sctp_v6_seq_dump_addr,
1160 .ecn_capable = sctp_v6_ecn_capable,
1161 .net_header_len = sizeof(struct ipv6hdr),
1162 .sockaddr_len = sizeof(struct sockaddr_in6),
1163 .ip_options_len = sctp_v6_ip_options_len,
1164 };
1165
1166 static struct sctp_pf sctp_pf_inet6 = {
1167 .event_msgname = sctp_inet6_event_msgname,
1168 .skb_msgname = sctp_inet6_skb_msgname,
1169 .af_supported = sctp_inet6_af_supported,
1170 .cmp_addr = sctp_inet6_cmp_addr,
1171 .bind_verify = sctp_inet6_bind_verify,
1172 .send_verify = sctp_inet6_send_verify,
1173 .supported_addrs = sctp_inet6_supported_addrs,
1174 .create_accept_sk = sctp_v6_create_accept_sk,
1175 .addr_to_user = sctp_v6_addr_to_user,
1176 .to_sk_saddr = sctp_v6_to_sk_saddr,
1177 .to_sk_daddr = sctp_v6_to_sk_daddr,
1178 .copy_ip_options = sctp_v6_copy_ip_options,
1179 .af = &sctp_af_inet6,
1180 };
1181
1182 /* Initialize IPv6 support and register with socket layer. */
sctp_v6_pf_init(void)1183 void sctp_v6_pf_init(void)
1184 {
1185 /* Register the SCTP specific PF_INET6 functions. */
1186 sctp_register_pf(&sctp_pf_inet6, PF_INET6);
1187
1188 /* Register the SCTP specific AF_INET6 functions. */
1189 sctp_register_af(&sctp_af_inet6);
1190 }
1191
sctp_v6_pf_exit(void)1192 void sctp_v6_pf_exit(void)
1193 {
1194 list_del(&sctp_af_inet6.list);
1195 }
1196
1197 /* Initialize IPv6 support and register with socket layer. */
sctp_v6_protosw_init(void)1198 int sctp_v6_protosw_init(void)
1199 {
1200 int rc;
1201
1202 rc = proto_register(&sctpv6_prot, 1);
1203 if (rc)
1204 return rc;
1205
1206 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
1207 inet6_register_protosw(&sctpv6_seqpacket_protosw);
1208 inet6_register_protosw(&sctpv6_stream_protosw);
1209
1210 return 0;
1211 }
1212
sctp_v6_protosw_exit(void)1213 void sctp_v6_protosw_exit(void)
1214 {
1215 inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
1216 inet6_unregister_protosw(&sctpv6_stream_protosw);
1217 proto_unregister(&sctpv6_prot);
1218 }
1219
1220
1221 /* Register with inet6 layer. */
sctp_v6_add_protocol(void)1222 int sctp_v6_add_protocol(void)
1223 {
1224 /* Register notifier for inet6 address additions/deletions. */
1225 register_inet6addr_notifier(&sctp_inet6addr_notifier);
1226
1227 if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0)
1228 return -EAGAIN;
1229
1230 return 0;
1231 }
1232
1233 /* Unregister with inet6 layer. */
sctp_v6_del_protocol(void)1234 void sctp_v6_del_protocol(void)
1235 {
1236 inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP);
1237 unregister_inet6addr_notifier(&sctp_inet6addr_notifier);
1238 }
1239