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1 | /* SCTP kernel implementation | |
2 | * (C) Copyright IBM Corp. 2002, 2004 | |
3 | * Copyright (c) 2001 Nokia, Inc. | |
4 | * Copyright (c) 2001 La Monte H.P. Yarroll | |
5 | * Copyright (c) 2002-2003 Intel Corp. | |
6 | * | |
7 | * This file is part of the SCTP kernel implementation | |
8 | * | |
9 | * SCTP over IPv6. | |
10 | * | |
11 | * This SCTP implementation is free software; | |
12 | * you can redistribute it and/or modify it under the terms of | |
13 | * the GNU General Public License as published by | |
14 | * the Free Software Foundation; either version 2, or (at your option) | |
15 | * any later version. | |
16 | * | |
17 | * This SCTP implementation is distributed in the hope that it | |
18 | * will be useful, but WITHOUT ANY WARRANTY; without even the implied | |
19 | * ************************ | |
20 | * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
21 | * See the GNU General Public License for more details. | |
22 | * | |
23 | * You should have received a copy of the GNU General Public License | |
24 | * along with GNU CC; see the file COPYING. If not, write to | |
25 | * the Free Software Foundation, 59 Temple Place - Suite 330, | |
26 | * Boston, MA 02111-1307, USA. | |
27 | * | |
28 | * Please send any bug reports or fixes you make to the | |
29 | * email address(es): | |
30 | * lksctp developers <linux-sctp@vger.kernel.org> | |
31 | * | |
32 | * Written or modified by: | |
33 | * Le Yanqun <yanqun.le@nokia.com> | |
34 | * Hui Huang <hui.huang@nokia.com> | |
35 | * La Monte H.P. Yarroll <piggy@acm.org> | |
36 | * Sridhar Samudrala <sri@us.ibm.com> | |
37 | * Jon Grimm <jgrimm@us.ibm.com> | |
38 | * Ardelle Fan <ardelle.fan@intel.com> | |
39 | * | |
40 | * Based on: | |
41 | * linux/net/ipv6/tcp_ipv6.c | |
42 | */ | |
43 | ||
44 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
45 | ||
46 | #include <linux/module.h> | |
47 | #include <linux/errno.h> | |
48 | #include <linux/types.h> | |
49 | #include <linux/socket.h> | |
50 | #include <linux/sockios.h> | |
51 | #include <linux/net.h> | |
52 | #include <linux/in.h> | |
53 | #include <linux/in6.h> | |
54 | #include <linux/netdevice.h> | |
55 | #include <linux/init.h> | |
56 | #include <linux/ipsec.h> | |
57 | #include <linux/slab.h> | |
58 | ||
59 | #include <linux/ipv6.h> | |
60 | #include <linux/icmpv6.h> | |
61 | #include <linux/random.h> | |
62 | #include <linux/seq_file.h> | |
63 | ||
64 | #include <net/protocol.h> | |
65 | #include <net/ndisc.h> | |
66 | #include <net/ip.h> | |
67 | #include <net/ipv6.h> | |
68 | #include <net/transp_v6.h> | |
69 | #include <net/addrconf.h> | |
70 | #include <net/ip6_route.h> | |
71 | #include <net/inet_common.h> | |
72 | #include <net/inet_ecn.h> | |
73 | #include <net/sctp/sctp.h> | |
74 | ||
75 | #include <asm/uaccess.h> | |
76 | ||
77 | static inline int sctp_v6_addr_match_len(union sctp_addr *s1, | |
78 | union sctp_addr *s2); | |
79 | static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr, | |
80 | __be16 port); | |
81 | static int sctp_v6_cmp_addr(const union sctp_addr *addr1, | |
82 | const union sctp_addr *addr2); | |
83 | ||
84 | /* Event handler for inet6 address addition/deletion events. | |
85 | * The sctp_local_addr_list needs to be protocted by a spin lock since | |
86 | * multiple notifiers (say IPv4 and IPv6) may be running at the same | |
87 | * time and thus corrupt the list. | |
88 | * The reader side is protected with RCU. | |
89 | */ | |
90 | static int sctp_inet6addr_event(struct notifier_block *this, unsigned long ev, | |
91 | void *ptr) | |
92 | { | |
93 | struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr; | |
94 | struct sctp_sockaddr_entry *addr = NULL; | |
95 | struct sctp_sockaddr_entry *temp; | |
96 | struct net *net = dev_net(ifa->idev->dev); | |
97 | int found = 0; | |
98 | ||
99 | switch (ev) { | |
100 | case NETDEV_UP: | |
101 | addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC); | |
102 | if (addr) { | |
103 | addr->a.v6.sin6_family = AF_INET6; | |
104 | addr->a.v6.sin6_port = 0; | |
105 | addr->a.v6.sin6_addr = ifa->addr; | |
106 | addr->a.v6.sin6_scope_id = ifa->idev->dev->ifindex; | |
107 | addr->valid = 1; | |
108 | spin_lock_bh(&net->sctp.local_addr_lock); | |
109 | list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list); | |
110 | sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW); | |
111 | spin_unlock_bh(&net->sctp.local_addr_lock); | |
112 | } | |
113 | break; | |
114 | case NETDEV_DOWN: | |
115 | spin_lock_bh(&net->sctp.local_addr_lock); | |
116 | list_for_each_entry_safe(addr, temp, | |
117 | &net->sctp.local_addr_list, list) { | |
118 | if (addr->a.sa.sa_family == AF_INET6 && | |
119 | ipv6_addr_equal(&addr->a.v6.sin6_addr, | |
120 | &ifa->addr)) { | |
121 | sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL); | |
122 | found = 1; | |
123 | addr->valid = 0; | |
124 | list_del_rcu(&addr->list); | |
125 | break; | |
126 | } | |
127 | } | |
128 | spin_unlock_bh(&net->sctp.local_addr_lock); | |
129 | if (found) | |
130 | kfree_rcu(addr, rcu); | |
131 | break; | |
132 | } | |
133 | ||
134 | return NOTIFY_DONE; | |
135 | } | |
136 | ||
137 | static struct notifier_block sctp_inet6addr_notifier = { | |
138 | .notifier_call = sctp_inet6addr_event, | |
139 | }; | |
140 | ||
141 | /* ICMP error handler. */ | |
142 | static void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
143 | u8 type, u8 code, int offset, __be32 info) | |
144 | { | |
145 | struct inet6_dev *idev; | |
146 | struct sock *sk; | |
147 | struct sctp_association *asoc; | |
148 | struct sctp_transport *transport; | |
149 | struct ipv6_pinfo *np; | |
150 | __u16 saveip, savesctp; | |
151 | int err; | |
152 | struct net *net = dev_net(skb->dev); | |
153 | ||
154 | idev = in6_dev_get(skb->dev); | |
155 | ||
156 | /* Fix up skb to look at the embedded net header. */ | |
157 | saveip = skb->network_header; | |
158 | savesctp = skb->transport_header; | |
159 | skb_reset_network_header(skb); | |
160 | skb_set_transport_header(skb, offset); | |
161 | sk = sctp_err_lookup(net, AF_INET6, skb, sctp_hdr(skb), &asoc, &transport); | |
162 | /* Put back, the original pointers. */ | |
163 | skb->network_header = saveip; | |
164 | skb->transport_header = savesctp; | |
165 | if (!sk) { | |
166 | ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_INERRORS); | |
167 | goto out; | |
168 | } | |
169 | ||
170 | /* Warning: The sock lock is held. Remember to call | |
171 | * sctp_err_finish! | |
172 | */ | |
173 | ||
174 | switch (type) { | |
175 | case ICMPV6_PKT_TOOBIG: | |
176 | sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info)); | |
177 | goto out_unlock; | |
178 | case ICMPV6_PARAMPROB: | |
179 | if (ICMPV6_UNK_NEXTHDR == code) { | |
180 | sctp_icmp_proto_unreachable(sk, asoc, transport); | |
181 | goto out_unlock; | |
182 | } | |
183 | break; | |
184 | case NDISC_REDIRECT: | |
185 | sctp_icmp_redirect(sk, transport, skb); | |
186 | goto out_unlock; | |
187 | default: | |
188 | break; | |
189 | } | |
190 | ||
191 | np = inet6_sk(sk); | |
192 | icmpv6_err_convert(type, code, &err); | |
193 | if (!sock_owned_by_user(sk) && np->recverr) { | |
194 | sk->sk_err = err; | |
195 | sk->sk_error_report(sk); | |
196 | } else { /* Only an error on timeout */ | |
197 | sk->sk_err_soft = err; | |
198 | } | |
199 | ||
200 | out_unlock: | |
201 | sctp_err_finish(sk, asoc); | |
202 | out: | |
203 | if (likely(idev != NULL)) | |
204 | in6_dev_put(idev); | |
205 | } | |
206 | ||
207 | static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport) | |
208 | { | |
209 | struct sock *sk = skb->sk; | |
210 | struct ipv6_pinfo *np = inet6_sk(sk); | |
211 | struct flowi6 *fl6 = &transport->fl.u.ip6; | |
212 | ||
213 | pr_debug("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n", __func__, skb, | |
214 | skb->len, &fl6->saddr, &fl6->daddr); | |
215 | ||
216 | IP6_ECN_flow_xmit(sk, fl6->flowlabel); | |
217 | ||
218 | if (!(transport->param_flags & SPP_PMTUD_ENABLE)) | |
219 | skb->local_df = 1; | |
220 | ||
221 | SCTP_INC_STATS(sock_net(sk), SCTP_MIB_OUTSCTPPACKS); | |
222 | ||
223 | return ip6_xmit(sk, skb, fl6, np->opt, np->tclass); | |
224 | } | |
225 | ||
226 | /* Returns the dst cache entry for the given source and destination ip | |
227 | * addresses. | |
228 | */ | |
229 | static void sctp_v6_get_dst(struct sctp_transport *t, union sctp_addr *saddr, | |
230 | struct flowi *fl, struct sock *sk) | |
231 | { | |
232 | struct sctp_association *asoc = t->asoc; | |
233 | struct dst_entry *dst = NULL; | |
234 | struct flowi6 *fl6 = &fl->u.ip6; | |
235 | struct sctp_bind_addr *bp; | |
236 | struct ipv6_pinfo *np = inet6_sk(sk); | |
237 | struct sctp_sockaddr_entry *laddr; | |
238 | union sctp_addr *baddr = NULL; | |
239 | union sctp_addr *daddr = &t->ipaddr; | |
240 | union sctp_addr dst_saddr; | |
241 | struct in6_addr *final_p, final; | |
242 | __u8 matchlen = 0; | |
243 | __u8 bmatchlen; | |
244 | sctp_scope_t scope; | |
245 | ||
246 | memset(fl6, 0, sizeof(struct flowi6)); | |
247 | fl6->daddr = daddr->v6.sin6_addr; | |
248 | fl6->fl6_dport = daddr->v6.sin6_port; | |
249 | fl6->flowi6_proto = IPPROTO_SCTP; | |
250 | if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) | |
251 | fl6->flowi6_oif = daddr->v6.sin6_scope_id; | |
252 | ||
253 | pr_debug("%s: dst=%pI6 ", __func__, &fl6->daddr); | |
254 | ||
255 | if (asoc) | |
256 | fl6->fl6_sport = htons(asoc->base.bind_addr.port); | |
257 | ||
258 | if (saddr) { | |
259 | fl6->saddr = saddr->v6.sin6_addr; | |
260 | fl6->fl6_sport = saddr->v6.sin6_port; | |
261 | ||
262 | pr_debug("src=%pI6 - ", &fl6->saddr); | |
263 | } | |
264 | ||
265 | final_p = fl6_update_dst(fl6, np->opt, &final); | |
266 | dst = ip6_dst_lookup_flow(sk, fl6, final_p, false); | |
267 | if (!asoc || saddr) | |
268 | goto out; | |
269 | ||
270 | bp = &asoc->base.bind_addr; | |
271 | scope = sctp_scope(daddr); | |
272 | /* ip6_dst_lookup has filled in the fl6->saddr for us. Check | |
273 | * to see if we can use it. | |
274 | */ | |
275 | if (!IS_ERR(dst)) { | |
276 | /* Walk through the bind address list and look for a bind | |
277 | * address that matches the source address of the returned dst. | |
278 | */ | |
279 | sctp_v6_to_addr(&dst_saddr, &fl6->saddr, htons(bp->port)); | |
280 | rcu_read_lock(); | |
281 | list_for_each_entry_rcu(laddr, &bp->address_list, list) { | |
282 | if (!laddr->valid || laddr->state == SCTP_ADDR_DEL || | |
283 | (laddr->state != SCTP_ADDR_SRC && | |
284 | !asoc->src_out_of_asoc_ok)) | |
285 | continue; | |
286 | ||
287 | /* Do not compare against v4 addrs */ | |
288 | if ((laddr->a.sa.sa_family == AF_INET6) && | |
289 | (sctp_v6_cmp_addr(&dst_saddr, &laddr->a))) { | |
290 | rcu_read_unlock(); | |
291 | goto out; | |
292 | } | |
293 | } | |
294 | rcu_read_unlock(); | |
295 | /* None of the bound addresses match the source address of the | |
296 | * dst. So release it. | |
297 | */ | |
298 | dst_release(dst); | |
299 | dst = NULL; | |
300 | } | |
301 | ||
302 | /* Walk through the bind address list and try to get the | |
303 | * best source address for a given destination. | |
304 | */ | |
305 | rcu_read_lock(); | |
306 | list_for_each_entry_rcu(laddr, &bp->address_list, list) { | |
307 | if (!laddr->valid) | |
308 | continue; | |
309 | if ((laddr->state == SCTP_ADDR_SRC) && | |
310 | (laddr->a.sa.sa_family == AF_INET6) && | |
311 | (scope <= sctp_scope(&laddr->a))) { | |
312 | bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a); | |
313 | if (!baddr || (matchlen < bmatchlen)) { | |
314 | baddr = &laddr->a; | |
315 | matchlen = bmatchlen; | |
316 | } | |
317 | } | |
318 | } | |
319 | rcu_read_unlock(); | |
320 | ||
321 | if (baddr) { | |
322 | fl6->saddr = baddr->v6.sin6_addr; | |
323 | fl6->fl6_sport = baddr->v6.sin6_port; | |
324 | final_p = fl6_update_dst(fl6, np->opt, &final); | |
325 | dst = ip6_dst_lookup_flow(sk, fl6, final_p, false); | |
326 | } | |
327 | ||
328 | out: | |
329 | if (!IS_ERR_OR_NULL(dst)) { | |
330 | struct rt6_info *rt; | |
331 | ||
332 | rt = (struct rt6_info *)dst; | |
333 | t->dst = dst; | |
334 | t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0; | |
335 | pr_debug("rt6_dst:%pI6 rt6_src:%pI6\n", &rt->rt6i_dst.addr, | |
336 | &fl6->saddr); | |
337 | } else { | |
338 | t->dst = NULL; | |
339 | ||
340 | pr_debug("no route\n"); | |
341 | } | |
342 | } | |
343 | ||
344 | /* Returns the number of consecutive initial bits that match in the 2 ipv6 | |
345 | * addresses. | |
346 | */ | |
347 | static inline int sctp_v6_addr_match_len(union sctp_addr *s1, | |
348 | union sctp_addr *s2) | |
349 | { | |
350 | return ipv6_addr_diff(&s1->v6.sin6_addr, &s2->v6.sin6_addr); | |
351 | } | |
352 | ||
353 | /* Fills in the source address(saddr) based on the destination address(daddr) | |
354 | * and asoc's bind address list. | |
355 | */ | |
356 | static void sctp_v6_get_saddr(struct sctp_sock *sk, | |
357 | struct sctp_transport *t, | |
358 | struct flowi *fl) | |
359 | { | |
360 | struct flowi6 *fl6 = &fl->u.ip6; | |
361 | union sctp_addr *saddr = &t->saddr; | |
362 | ||
363 | pr_debug("%s: asoc:%p dst:%p\n", __func__, t->asoc, t->dst); | |
364 | ||
365 | if (t->dst) { | |
366 | saddr->v6.sin6_family = AF_INET6; | |
367 | saddr->v6.sin6_addr = fl6->saddr; | |
368 | } | |
369 | } | |
370 | ||
371 | /* Make a copy of all potential local addresses. */ | |
372 | static void sctp_v6_copy_addrlist(struct list_head *addrlist, | |
373 | struct net_device *dev) | |
374 | { | |
375 | struct inet6_dev *in6_dev; | |
376 | struct inet6_ifaddr *ifp; | |
377 | struct sctp_sockaddr_entry *addr; | |
378 | ||
379 | rcu_read_lock(); | |
380 | if ((in6_dev = __in6_dev_get(dev)) == NULL) { | |
381 | rcu_read_unlock(); | |
382 | return; | |
383 | } | |
384 | ||
385 | read_lock_bh(&in6_dev->lock); | |
386 | list_for_each_entry(ifp, &in6_dev->addr_list, if_list) { | |
387 | /* Add the address to the local list. */ | |
388 | addr = kzalloc(sizeof(*addr), GFP_ATOMIC); | |
389 | if (addr) { | |
390 | addr->a.v6.sin6_family = AF_INET6; | |
391 | addr->a.v6.sin6_port = 0; | |
392 | addr->a.v6.sin6_addr = ifp->addr; | |
393 | addr->a.v6.sin6_scope_id = dev->ifindex; | |
394 | addr->valid = 1; | |
395 | INIT_LIST_HEAD(&addr->list); | |
396 | list_add_tail(&addr->list, addrlist); | |
397 | } | |
398 | } | |
399 | ||
400 | read_unlock_bh(&in6_dev->lock); | |
401 | rcu_read_unlock(); | |
402 | } | |
403 | ||
404 | /* Initialize a sockaddr_storage from in incoming skb. */ | |
405 | static void sctp_v6_from_skb(union sctp_addr *addr,struct sk_buff *skb, | |
406 | int is_saddr) | |
407 | { | |
408 | __be16 *port; | |
409 | struct sctphdr *sh; | |
410 | ||
411 | port = &addr->v6.sin6_port; | |
412 | addr->v6.sin6_family = AF_INET6; | |
413 | addr->v6.sin6_flowinfo = 0; /* FIXME */ | |
414 | addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif; | |
415 | ||
416 | sh = sctp_hdr(skb); | |
417 | if (is_saddr) { | |
418 | *port = sh->source; | |
419 | addr->v6.sin6_addr = ipv6_hdr(skb)->saddr; | |
420 | } else { | |
421 | *port = sh->dest; | |
422 | addr->v6.sin6_addr = ipv6_hdr(skb)->daddr; | |
423 | } | |
424 | } | |
425 | ||
426 | /* Initialize an sctp_addr from a socket. */ | |
427 | static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk) | |
428 | { | |
429 | addr->v6.sin6_family = AF_INET6; | |
430 | addr->v6.sin6_port = 0; | |
431 | addr->v6.sin6_addr = sk->sk_v6_rcv_saddr; | |
432 | } | |
433 | ||
434 | /* Initialize sk->sk_rcv_saddr from sctp_addr. */ | |
435 | static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk) | |
436 | { | |
437 | if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) { | |
438 | sk->sk_v6_rcv_saddr.s6_addr32[0] = 0; | |
439 | sk->sk_v6_rcv_saddr.s6_addr32[1] = 0; | |
440 | sk->sk_v6_rcv_saddr.s6_addr32[2] = htonl(0x0000ffff); | |
441 | sk->sk_v6_rcv_saddr.s6_addr32[3] = | |
442 | addr->v4.sin_addr.s_addr; | |
443 | } else { | |
444 | sk->sk_v6_rcv_saddr = addr->v6.sin6_addr; | |
445 | } | |
446 | } | |
447 | ||
448 | /* Initialize sk->sk_daddr from sctp_addr. */ | |
449 | static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk) | |
450 | { | |
451 | if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) { | |
452 | sk->sk_v6_daddr.s6_addr32[0] = 0; | |
453 | sk->sk_v6_daddr.s6_addr32[1] = 0; | |
454 | sk->sk_v6_daddr.s6_addr32[2] = htonl(0x0000ffff); | |
455 | sk->sk_v6_daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr; | |
456 | } else { | |
457 | sk->sk_v6_daddr = addr->v6.sin6_addr; | |
458 | } | |
459 | } | |
460 | ||
461 | /* Initialize a sctp_addr from an address parameter. */ | |
462 | static void sctp_v6_from_addr_param(union sctp_addr *addr, | |
463 | union sctp_addr_param *param, | |
464 | __be16 port, int iif) | |
465 | { | |
466 | addr->v6.sin6_family = AF_INET6; | |
467 | addr->v6.sin6_port = port; | |
468 | addr->v6.sin6_flowinfo = 0; /* BUG */ | |
469 | addr->v6.sin6_addr = param->v6.addr; | |
470 | addr->v6.sin6_scope_id = iif; | |
471 | } | |
472 | ||
473 | /* Initialize an address parameter from a sctp_addr and return the length | |
474 | * of the address parameter. | |
475 | */ | |
476 | static int sctp_v6_to_addr_param(const union sctp_addr *addr, | |
477 | union sctp_addr_param *param) | |
478 | { | |
479 | int length = sizeof(sctp_ipv6addr_param_t); | |
480 | ||
481 | param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS; | |
482 | param->v6.param_hdr.length = htons(length); | |
483 | param->v6.addr = addr->v6.sin6_addr; | |
484 | ||
485 | return length; | |
486 | } | |
487 | ||
488 | /* Initialize a sctp_addr from struct in6_addr. */ | |
489 | static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr, | |
490 | __be16 port) | |
491 | { | |
492 | addr->sa.sa_family = AF_INET6; | |
493 | addr->v6.sin6_port = port; | |
494 | addr->v6.sin6_addr = *saddr; | |
495 | } | |
496 | ||
497 | /* Compare addresses exactly. | |
498 | * v4-mapped-v6 is also in consideration. | |
499 | */ | |
500 | static int sctp_v6_cmp_addr(const union sctp_addr *addr1, | |
501 | const union sctp_addr *addr2) | |
502 | { | |
503 | if (addr1->sa.sa_family != addr2->sa.sa_family) { | |
504 | if (addr1->sa.sa_family == AF_INET && | |
505 | addr2->sa.sa_family == AF_INET6 && | |
506 | ipv6_addr_v4mapped(&addr2->v6.sin6_addr)) { | |
507 | if (addr2->v6.sin6_port == addr1->v4.sin_port && | |
508 | addr2->v6.sin6_addr.s6_addr32[3] == | |
509 | addr1->v4.sin_addr.s_addr) | |
510 | return 1; | |
511 | } | |
512 | if (addr2->sa.sa_family == AF_INET && | |
513 | addr1->sa.sa_family == AF_INET6 && | |
514 | ipv6_addr_v4mapped(&addr1->v6.sin6_addr)) { | |
515 | if (addr1->v6.sin6_port == addr2->v4.sin_port && | |
516 | addr1->v6.sin6_addr.s6_addr32[3] == | |
517 | addr2->v4.sin_addr.s_addr) | |
518 | return 1; | |
519 | } | |
520 | return 0; | |
521 | } | |
522 | if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr)) | |
523 | return 0; | |
524 | /* If this is a linklocal address, compare the scope_id. */ | |
525 | if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) { | |
526 | if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id && | |
527 | (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) { | |
528 | return 0; | |
529 | } | |
530 | } | |
531 | ||
532 | return 1; | |
533 | } | |
534 | ||
535 | /* Initialize addr struct to INADDR_ANY. */ | |
536 | static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port) | |
537 | { | |
538 | memset(addr, 0x00, sizeof(union sctp_addr)); | |
539 | addr->v6.sin6_family = AF_INET6; | |
540 | addr->v6.sin6_port = port; | |
541 | } | |
542 | ||
543 | /* Is this a wildcard address? */ | |
544 | static int sctp_v6_is_any(const union sctp_addr *addr) | |
545 | { | |
546 | return ipv6_addr_any(&addr->v6.sin6_addr); | |
547 | } | |
548 | ||
549 | /* Should this be available for binding? */ | |
550 | static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp) | |
551 | { | |
552 | int type; | |
553 | const struct in6_addr *in6 = (const struct in6_addr *)&addr->v6.sin6_addr; | |
554 | ||
555 | type = ipv6_addr_type(in6); | |
556 | if (IPV6_ADDR_ANY == type) | |
557 | return 1; | |
558 | if (type == IPV6_ADDR_MAPPED) { | |
559 | if (sp && !sp->v4mapped) | |
560 | return 0; | |
561 | if (sp && ipv6_only_sock(sctp_opt2sk(sp))) | |
562 | return 0; | |
563 | sctp_v6_map_v4(addr); | |
564 | return sctp_get_af_specific(AF_INET)->available(addr, sp); | |
565 | } | |
566 | if (!(type & IPV6_ADDR_UNICAST)) | |
567 | return 0; | |
568 | ||
569 | return ipv6_chk_addr(sock_net(&sp->inet.sk), in6, NULL, 0); | |
570 | } | |
571 | ||
572 | /* This function checks if the address is a valid address to be used for | |
573 | * SCTP. | |
574 | * | |
575 | * Output: | |
576 | * Return 0 - If the address is a non-unicast or an illegal address. | |
577 | * Return 1 - If the address is a unicast. | |
578 | */ | |
579 | static int sctp_v6_addr_valid(union sctp_addr *addr, | |
580 | struct sctp_sock *sp, | |
581 | const struct sk_buff *skb) | |
582 | { | |
583 | int ret = ipv6_addr_type(&addr->v6.sin6_addr); | |
584 | ||
585 | /* Support v4-mapped-v6 address. */ | |
586 | if (ret == IPV6_ADDR_MAPPED) { | |
587 | /* Note: This routine is used in input, so v4-mapped-v6 | |
588 | * are disallowed here when there is no sctp_sock. | |
589 | */ | |
590 | if (!sp || !sp->v4mapped) | |
591 | return 0; | |
592 | if (sp && ipv6_only_sock(sctp_opt2sk(sp))) | |
593 | return 0; | |
594 | sctp_v6_map_v4(addr); | |
595 | return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb); | |
596 | } | |
597 | ||
598 | /* Is this a non-unicast address */ | |
599 | if (!(ret & IPV6_ADDR_UNICAST)) | |
600 | return 0; | |
601 | ||
602 | return 1; | |
603 | } | |
604 | ||
605 | /* What is the scope of 'addr'? */ | |
606 | static sctp_scope_t sctp_v6_scope(union sctp_addr *addr) | |
607 | { | |
608 | int v6scope; | |
609 | sctp_scope_t retval; | |
610 | ||
611 | /* The IPv6 scope is really a set of bit fields. | |
612 | * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope. | |
613 | */ | |
614 | ||
615 | v6scope = ipv6_addr_scope(&addr->v6.sin6_addr); | |
616 | switch (v6scope) { | |
617 | case IFA_HOST: | |
618 | retval = SCTP_SCOPE_LOOPBACK; | |
619 | break; | |
620 | case IFA_LINK: | |
621 | retval = SCTP_SCOPE_LINK; | |
622 | break; | |
623 | case IFA_SITE: | |
624 | retval = SCTP_SCOPE_PRIVATE; | |
625 | break; | |
626 | default: | |
627 | retval = SCTP_SCOPE_GLOBAL; | |
628 | break; | |
629 | } | |
630 | ||
631 | return retval; | |
632 | } | |
633 | ||
634 | /* Create and initialize a new sk for the socket to be returned by accept(). */ | |
635 | static struct sock *sctp_v6_create_accept_sk(struct sock *sk, | |
636 | struct sctp_association *asoc) | |
637 | { | |
638 | struct sock *newsk; | |
639 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); | |
640 | struct sctp6_sock *newsctp6sk; | |
641 | ||
642 | newsk = sk_alloc(sock_net(sk), PF_INET6, GFP_KERNEL, sk->sk_prot); | |
643 | if (!newsk) | |
644 | goto out; | |
645 | ||
646 | sock_init_data(NULL, newsk); | |
647 | ||
648 | sctp_copy_sock(newsk, sk, asoc); | |
649 | sock_reset_flag(sk, SOCK_ZAPPED); | |
650 | ||
651 | newsctp6sk = (struct sctp6_sock *)newsk; | |
652 | inet_sk(newsk)->pinet6 = &newsctp6sk->inet6; | |
653 | ||
654 | sctp_sk(newsk)->v4mapped = sctp_sk(sk)->v4mapped; | |
655 | ||
656 | newnp = inet6_sk(newsk); | |
657 | ||
658 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
659 | ||
660 | /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname() | |
661 | * and getpeername(). | |
662 | */ | |
663 | sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk); | |
664 | ||
665 | sk_refcnt_debug_inc(newsk); | |
666 | ||
667 | if (newsk->sk_prot->init(newsk)) { | |
668 | sk_common_release(newsk); | |
669 | newsk = NULL; | |
670 | } | |
671 | ||
672 | out: | |
673 | return newsk; | |
674 | } | |
675 | ||
676 | /* Map v4 address to mapped v6 address */ | |
677 | static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr) | |
678 | { | |
679 | if (sp->v4mapped && AF_INET == addr->sa.sa_family) | |
680 | sctp_v4_map_v6(addr); | |
681 | } | |
682 | ||
683 | /* Where did this skb come from? */ | |
684 | static int sctp_v6_skb_iif(const struct sk_buff *skb) | |
685 | { | |
686 | struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb; | |
687 | return opt->iif; | |
688 | } | |
689 | ||
690 | /* Was this packet marked by Explicit Congestion Notification? */ | |
691 | static int sctp_v6_is_ce(const struct sk_buff *skb) | |
692 | { | |
693 | return *((__u32 *)(ipv6_hdr(skb))) & htonl(1 << 20); | |
694 | } | |
695 | ||
696 | /* Dump the v6 addr to the seq file. */ | |
697 | static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr) | |
698 | { | |
699 | seq_printf(seq, "%pI6 ", &addr->v6.sin6_addr); | |
700 | } | |
701 | ||
702 | static void sctp_v6_ecn_capable(struct sock *sk) | |
703 | { | |
704 | inet6_sk(sk)->tclass |= INET_ECN_ECT_0; | |
705 | } | |
706 | ||
707 | /* Initialize a PF_INET6 socket msg_name. */ | |
708 | static void sctp_inet6_msgname(char *msgname, int *addr_len) | |
709 | { | |
710 | struct sockaddr_in6 *sin6; | |
711 | ||
712 | sin6 = (struct sockaddr_in6 *)msgname; | |
713 | sin6->sin6_family = AF_INET6; | |
714 | sin6->sin6_flowinfo = 0; | |
715 | sin6->sin6_scope_id = 0; /*FIXME */ | |
716 | *addr_len = sizeof(struct sockaddr_in6); | |
717 | } | |
718 | ||
719 | /* Initialize a PF_INET msgname from a ulpevent. */ | |
720 | static void sctp_inet6_event_msgname(struct sctp_ulpevent *event, | |
721 | char *msgname, int *addrlen) | |
722 | { | |
723 | struct sockaddr_in6 *sin6, *sin6from; | |
724 | ||
725 | if (msgname) { | |
726 | union sctp_addr *addr; | |
727 | struct sctp_association *asoc; | |
728 | ||
729 | asoc = event->asoc; | |
730 | sctp_inet6_msgname(msgname, addrlen); | |
731 | sin6 = (struct sockaddr_in6 *)msgname; | |
732 | sin6->sin6_port = htons(asoc->peer.port); | |
733 | addr = &asoc->peer.primary_addr; | |
734 | ||
735 | /* Note: If we go to a common v6 format, this code | |
736 | * will change. | |
737 | */ | |
738 | ||
739 | /* Map ipv4 address into v4-mapped-on-v6 address. */ | |
740 | if (sctp_sk(asoc->base.sk)->v4mapped && | |
741 | AF_INET == addr->sa.sa_family) { | |
742 | sctp_v4_map_v6((union sctp_addr *)sin6); | |
743 | sin6->sin6_addr.s6_addr32[3] = | |
744 | addr->v4.sin_addr.s_addr; | |
745 | return; | |
746 | } | |
747 | ||
748 | sin6from = &asoc->peer.primary_addr.v6; | |
749 | sin6->sin6_addr = sin6from->sin6_addr; | |
750 | if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) | |
751 | sin6->sin6_scope_id = sin6from->sin6_scope_id; | |
752 | } | |
753 | } | |
754 | ||
755 | /* Initialize a msg_name from an inbound skb. */ | |
756 | static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname, | |
757 | int *addr_len) | |
758 | { | |
759 | struct sctphdr *sh; | |
760 | struct sockaddr_in6 *sin6; | |
761 | ||
762 | if (msgname) { | |
763 | sctp_inet6_msgname(msgname, addr_len); | |
764 | sin6 = (struct sockaddr_in6 *)msgname; | |
765 | sh = sctp_hdr(skb); | |
766 | sin6->sin6_port = sh->source; | |
767 | ||
768 | /* Map ipv4 address into v4-mapped-on-v6 address. */ | |
769 | if (sctp_sk(skb->sk)->v4mapped && | |
770 | ip_hdr(skb)->version == 4) { | |
771 | sctp_v4_map_v6((union sctp_addr *)sin6); | |
772 | sin6->sin6_addr.s6_addr32[3] = ip_hdr(skb)->saddr; | |
773 | return; | |
774 | } | |
775 | ||
776 | /* Otherwise, just copy the v6 address. */ | |
777 | sin6->sin6_addr = ipv6_hdr(skb)->saddr; | |
778 | if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) { | |
779 | struct sctp_ulpevent *ev = sctp_skb2event(skb); | |
780 | sin6->sin6_scope_id = ev->iif; | |
781 | } | |
782 | } | |
783 | } | |
784 | ||
785 | /* Do we support this AF? */ | |
786 | static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp) | |
787 | { | |
788 | switch (family) { | |
789 | case AF_INET6: | |
790 | return 1; | |
791 | /* v4-mapped-v6 addresses */ | |
792 | case AF_INET: | |
793 | if (!__ipv6_only_sock(sctp_opt2sk(sp))) | |
794 | return 1; | |
795 | default: | |
796 | return 0; | |
797 | } | |
798 | } | |
799 | ||
800 | /* Address matching with wildcards allowed. This extra level | |
801 | * of indirection lets us choose whether a PF_INET6 should | |
802 | * disallow any v4 addresses if we so choose. | |
803 | */ | |
804 | static int sctp_inet6_cmp_addr(const union sctp_addr *addr1, | |
805 | const union sctp_addr *addr2, | |
806 | struct sctp_sock *opt) | |
807 | { | |
808 | struct sctp_af *af1, *af2; | |
809 | struct sock *sk = sctp_opt2sk(opt); | |
810 | ||
811 | af1 = sctp_get_af_specific(addr1->sa.sa_family); | |
812 | af2 = sctp_get_af_specific(addr2->sa.sa_family); | |
813 | ||
814 | if (!af1 || !af2) | |
815 | return 0; | |
816 | ||
817 | /* If the socket is IPv6 only, v4 addrs will not match */ | |
818 | if (__ipv6_only_sock(sk) && af1 != af2) | |
819 | return 0; | |
820 | ||
821 | /* Today, wildcard AF_INET/AF_INET6. */ | |
822 | if (sctp_is_any(sk, addr1) || sctp_is_any(sk, addr2)) | |
823 | return 1; | |
824 | ||
825 | if (addr1->sa.sa_family != addr2->sa.sa_family) | |
826 | return 0; | |
827 | ||
828 | return af1->cmp_addr(addr1, addr2); | |
829 | } | |
830 | ||
831 | /* Verify that the provided sockaddr looks bindable. Common verification, | |
832 | * has already been taken care of. | |
833 | */ | |
834 | static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) | |
835 | { | |
836 | struct sctp_af *af; | |
837 | ||
838 | /* ASSERT: address family has already been verified. */ | |
839 | if (addr->sa.sa_family != AF_INET6) | |
840 | af = sctp_get_af_specific(addr->sa.sa_family); | |
841 | else { | |
842 | int type = ipv6_addr_type(&addr->v6.sin6_addr); | |
843 | struct net_device *dev; | |
844 | ||
845 | if (type & IPV6_ADDR_LINKLOCAL) { | |
846 | struct net *net; | |
847 | if (!addr->v6.sin6_scope_id) | |
848 | return 0; | |
849 | net = sock_net(&opt->inet.sk); | |
850 | rcu_read_lock(); | |
851 | dev = dev_get_by_index_rcu(net, addr->v6.sin6_scope_id); | |
852 | if (!dev || | |
853 | !ipv6_chk_addr(net, &addr->v6.sin6_addr, dev, 0)) { | |
854 | rcu_read_unlock(); | |
855 | return 0; | |
856 | } | |
857 | rcu_read_unlock(); | |
858 | } else if (type == IPV6_ADDR_MAPPED) { | |
859 | if (!opt->v4mapped) | |
860 | return 0; | |
861 | } | |
862 | ||
863 | af = opt->pf->af; | |
864 | } | |
865 | return af->available(addr, opt); | |
866 | } | |
867 | ||
868 | /* Verify that the provided sockaddr looks sendable. Common verification, | |
869 | * has already been taken care of. | |
870 | */ | |
871 | static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr) | |
872 | { | |
873 | struct sctp_af *af = NULL; | |
874 | ||
875 | /* ASSERT: address family has already been verified. */ | |
876 | if (addr->sa.sa_family != AF_INET6) | |
877 | af = sctp_get_af_specific(addr->sa.sa_family); | |
878 | else { | |
879 | int type = ipv6_addr_type(&addr->v6.sin6_addr); | |
880 | struct net_device *dev; | |
881 | ||
882 | if (type & IPV6_ADDR_LINKLOCAL) { | |
883 | if (!addr->v6.sin6_scope_id) | |
884 | return 0; | |
885 | rcu_read_lock(); | |
886 | dev = dev_get_by_index_rcu(sock_net(&opt->inet.sk), | |
887 | addr->v6.sin6_scope_id); | |
888 | rcu_read_unlock(); | |
889 | if (!dev) | |
890 | return 0; | |
891 | } | |
892 | af = opt->pf->af; | |
893 | } | |
894 | ||
895 | return af != NULL; | |
896 | } | |
897 | ||
898 | /* Fill in Supported Address Type information for INIT and INIT-ACK | |
899 | * chunks. Note: In the future, we may want to look at sock options | |
900 | * to determine whether a PF_INET6 socket really wants to have IPV4 | |
901 | * addresses. | |
902 | * Returns number of addresses supported. | |
903 | */ | |
904 | static int sctp_inet6_supported_addrs(const struct sctp_sock *opt, | |
905 | __be16 *types) | |
906 | { | |
907 | types[0] = SCTP_PARAM_IPV6_ADDRESS; | |
908 | if (!opt || !ipv6_only_sock(sctp_opt2sk(opt))) { | |
909 | types[1] = SCTP_PARAM_IPV4_ADDRESS; | |
910 | return 2; | |
911 | } | |
912 | return 1; | |
913 | } | |
914 | ||
915 | static const struct proto_ops inet6_seqpacket_ops = { | |
916 | .family = PF_INET6, | |
917 | .owner = THIS_MODULE, | |
918 | .release = inet6_release, | |
919 | .bind = inet6_bind, | |
920 | .connect = inet_dgram_connect, | |
921 | .socketpair = sock_no_socketpair, | |
922 | .accept = inet_accept, | |
923 | .getname = inet6_getname, | |
924 | .poll = sctp_poll, | |
925 | .ioctl = inet6_ioctl, | |
926 | .listen = sctp_inet_listen, | |
927 | .shutdown = inet_shutdown, | |
928 | .setsockopt = sock_common_setsockopt, | |
929 | .getsockopt = sock_common_getsockopt, | |
930 | .sendmsg = inet_sendmsg, | |
931 | .recvmsg = sock_common_recvmsg, | |
932 | .mmap = sock_no_mmap, | |
933 | #ifdef CONFIG_COMPAT | |
934 | .compat_setsockopt = compat_sock_common_setsockopt, | |
935 | .compat_getsockopt = compat_sock_common_getsockopt, | |
936 | #endif | |
937 | }; | |
938 | ||
939 | static struct inet_protosw sctpv6_seqpacket_protosw = { | |
940 | .type = SOCK_SEQPACKET, | |
941 | .protocol = IPPROTO_SCTP, | |
942 | .prot = &sctpv6_prot, | |
943 | .ops = &inet6_seqpacket_ops, | |
944 | .no_check = 0, | |
945 | .flags = SCTP_PROTOSW_FLAG | |
946 | }; | |
947 | static struct inet_protosw sctpv6_stream_protosw = { | |
948 | .type = SOCK_STREAM, | |
949 | .protocol = IPPROTO_SCTP, | |
950 | .prot = &sctpv6_prot, | |
951 | .ops = &inet6_seqpacket_ops, | |
952 | .no_check = 0, | |
953 | .flags = SCTP_PROTOSW_FLAG, | |
954 | }; | |
955 | ||
956 | static int sctp6_rcv(struct sk_buff *skb) | |
957 | { | |
958 | return sctp_rcv(skb) ? -1 : 0; | |
959 | } | |
960 | ||
961 | static const struct inet6_protocol sctpv6_protocol = { | |
962 | .handler = sctp6_rcv, | |
963 | .err_handler = sctp_v6_err, | |
964 | .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, | |
965 | }; | |
966 | ||
967 | static struct sctp_af sctp_af_inet6 = { | |
968 | .sa_family = AF_INET6, | |
969 | .sctp_xmit = sctp_v6_xmit, | |
970 | .setsockopt = ipv6_setsockopt, | |
971 | .getsockopt = ipv6_getsockopt, | |
972 | .get_dst = sctp_v6_get_dst, | |
973 | .get_saddr = sctp_v6_get_saddr, | |
974 | .copy_addrlist = sctp_v6_copy_addrlist, | |
975 | .from_skb = sctp_v6_from_skb, | |
976 | .from_sk = sctp_v6_from_sk, | |
977 | .to_sk_saddr = sctp_v6_to_sk_saddr, | |
978 | .to_sk_daddr = sctp_v6_to_sk_daddr, | |
979 | .from_addr_param = sctp_v6_from_addr_param, | |
980 | .to_addr_param = sctp_v6_to_addr_param, | |
981 | .cmp_addr = sctp_v6_cmp_addr, | |
982 | .scope = sctp_v6_scope, | |
983 | .addr_valid = sctp_v6_addr_valid, | |
984 | .inaddr_any = sctp_v6_inaddr_any, | |
985 | .is_any = sctp_v6_is_any, | |
986 | .available = sctp_v6_available, | |
987 | .skb_iif = sctp_v6_skb_iif, | |
988 | .is_ce = sctp_v6_is_ce, | |
989 | .seq_dump_addr = sctp_v6_seq_dump_addr, | |
990 | .ecn_capable = sctp_v6_ecn_capable, | |
991 | .net_header_len = sizeof(struct ipv6hdr), | |
992 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
993 | #ifdef CONFIG_COMPAT | |
994 | .compat_setsockopt = compat_ipv6_setsockopt, | |
995 | .compat_getsockopt = compat_ipv6_getsockopt, | |
996 | #endif | |
997 | }; | |
998 | ||
999 | static struct sctp_pf sctp_pf_inet6 = { | |
1000 | .event_msgname = sctp_inet6_event_msgname, | |
1001 | .skb_msgname = sctp_inet6_skb_msgname, | |
1002 | .af_supported = sctp_inet6_af_supported, | |
1003 | .cmp_addr = sctp_inet6_cmp_addr, | |
1004 | .bind_verify = sctp_inet6_bind_verify, | |
1005 | .send_verify = sctp_inet6_send_verify, | |
1006 | .supported_addrs = sctp_inet6_supported_addrs, | |
1007 | .create_accept_sk = sctp_v6_create_accept_sk, | |
1008 | .addr_v4map = sctp_v6_addr_v4map, | |
1009 | .af = &sctp_af_inet6, | |
1010 | }; | |
1011 | ||
1012 | /* Initialize IPv6 support and register with socket layer. */ | |
1013 | void sctp_v6_pf_init(void) | |
1014 | { | |
1015 | /* Register the SCTP specific PF_INET6 functions. */ | |
1016 | sctp_register_pf(&sctp_pf_inet6, PF_INET6); | |
1017 | ||
1018 | /* Register the SCTP specific AF_INET6 functions. */ | |
1019 | sctp_register_af(&sctp_af_inet6); | |
1020 | } | |
1021 | ||
1022 | void sctp_v6_pf_exit(void) | |
1023 | { | |
1024 | list_del(&sctp_af_inet6.list); | |
1025 | } | |
1026 | ||
1027 | /* Initialize IPv6 support and register with socket layer. */ | |
1028 | int sctp_v6_protosw_init(void) | |
1029 | { | |
1030 | int rc; | |
1031 | ||
1032 | rc = proto_register(&sctpv6_prot, 1); | |
1033 | if (rc) | |
1034 | return rc; | |
1035 | ||
1036 | /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */ | |
1037 | inet6_register_protosw(&sctpv6_seqpacket_protosw); | |
1038 | inet6_register_protosw(&sctpv6_stream_protosw); | |
1039 | ||
1040 | return 0; | |
1041 | } | |
1042 | ||
1043 | void sctp_v6_protosw_exit(void) | |
1044 | { | |
1045 | inet6_unregister_protosw(&sctpv6_seqpacket_protosw); | |
1046 | inet6_unregister_protosw(&sctpv6_stream_protosw); | |
1047 | proto_unregister(&sctpv6_prot); | |
1048 | } | |
1049 | ||
1050 | ||
1051 | /* Register with inet6 layer. */ | |
1052 | int sctp_v6_add_protocol(void) | |
1053 | { | |
1054 | /* Register notifier for inet6 address additions/deletions. */ | |
1055 | register_inet6addr_notifier(&sctp_inet6addr_notifier); | |
1056 | ||
1057 | if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0) | |
1058 | return -EAGAIN; | |
1059 | ||
1060 | return 0; | |
1061 | } | |
1062 | ||
1063 | /* Unregister with inet6 layer. */ | |
1064 | void sctp_v6_del_protocol(void) | |
1065 | { | |
1066 | inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP); | |
1067 | unregister_inet6addr_notifier(&sctp_inet6addr_notifier); | |
1068 | } |