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1da177e4 LT |
1 | /* SCTP kernel reference 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 reference Implementation | |
8 | * | |
9 | * SCTP over IPv6. | |
10 | * | |
11 | * The SCTP reference 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 | * The SCTP reference 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 <lksctp-developers@lists.sourceforge.net> | |
31 | * | |
32 | * Or submit a bug report through the following website: | |
33 | * http://www.sf.net/projects/lksctp | |
34 | * | |
35 | * Written or modified by: | |
36 | * Le Yanqun <yanqun.le@nokia.com> | |
37 | * Hui Huang <hui.huang@nokia.com> | |
38 | * La Monte H.P. Yarroll <piggy@acm.org> | |
39 | * Sridhar Samudrala <sri@us.ibm.com> | |
40 | * Jon Grimm <jgrimm@us.ibm.com> | |
41 | * Ardelle Fan <ardelle.fan@intel.com> | |
42 | * | |
43 | * Based on: | |
44 | * linux/net/ipv6/tcp_ipv6.c | |
45 | * | |
46 | * Any bugs reported given to us we will try to fix... any fixes shared will | |
47 | * be incorporated into the next SCTP release. | |
48 | */ | |
49 | ||
50 | #include <linux/module.h> | |
51 | #include <linux/errno.h> | |
52 | #include <linux/types.h> | |
53 | #include <linux/socket.h> | |
54 | #include <linux/sockios.h> | |
55 | #include <linux/net.h> | |
56 | #include <linux/sched.h> | |
57 | #include <linux/in.h> | |
58 | #include <linux/in6.h> | |
59 | #include <linux/netdevice.h> | |
60 | #include <linux/init.h> | |
61 | #include <linux/ipsec.h> | |
62 | ||
63 | #include <linux/ipv6.h> | |
64 | #include <linux/icmpv6.h> | |
65 | #include <linux/random.h> | |
66 | #include <linux/seq_file.h> | |
67 | ||
68 | #include <net/protocol.h> | |
1da177e4 | 69 | #include <net/ndisc.h> |
c752f073 | 70 | #include <net/ip.h> |
1da177e4 LT |
71 | #include <net/ipv6.h> |
72 | #include <net/transp_v6.h> | |
73 | #include <net/addrconf.h> | |
74 | #include <net/ip6_route.h> | |
75 | #include <net/inet_common.h> | |
76 | #include <net/inet_ecn.h> | |
77 | #include <net/sctp/sctp.h> | |
78 | ||
79 | #include <asm/uaccess.h> | |
80 | ||
1da177e4 LT |
81 | static struct notifier_block sctp_inet6addr_notifier = { |
82 | .notifier_call = sctp_inetaddr_event, | |
83 | }; | |
84 | ||
85 | /* ICMP error handler. */ | |
86 | SCTP_STATIC void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
04ce6909 | 87 | int type, int code, int offset, __be32 info) |
1da177e4 LT |
88 | { |
89 | struct inet6_dev *idev; | |
90 | struct ipv6hdr *iph = (struct ipv6hdr *)skb->data; | |
91 | struct sctphdr *sh = (struct sctphdr *)(skb->data + offset); | |
92 | struct sock *sk; | |
1da177e4 LT |
93 | struct sctp_association *asoc; |
94 | struct sctp_transport *transport; | |
95 | struct ipv6_pinfo *np; | |
96 | char *saveip, *savesctp; | |
97 | int err; | |
98 | ||
99 | idev = in6_dev_get(skb->dev); | |
100 | ||
101 | /* Fix up skb to look at the embedded net header. */ | |
102 | saveip = skb->nh.raw; | |
103 | savesctp = skb->h.raw; | |
104 | skb->nh.ipv6h = iph; | |
105 | skb->h.raw = (char *)sh; | |
d1ad1ff2 | 106 | sk = sctp_err_lookup(AF_INET6, skb, sh, &asoc, &transport); |
1da177e4 LT |
107 | /* Put back, the original pointers. */ |
108 | skb->nh.raw = saveip; | |
109 | skb->h.raw = savesctp; | |
110 | if (!sk) { | |
111 | ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INERRORS); | |
112 | goto out; | |
113 | } | |
114 | ||
115 | /* Warning: The sock lock is held. Remember to call | |
116 | * sctp_err_finish! | |
117 | */ | |
118 | ||
119 | switch (type) { | |
120 | case ICMPV6_PKT_TOOBIG: | |
121 | sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info)); | |
122 | goto out_unlock; | |
123 | case ICMPV6_PARAMPROB: | |
124 | if (ICMPV6_UNK_NEXTHDR == code) { | |
d1ad1ff2 | 125 | sctp_icmp_proto_unreachable(sk, asoc, transport); |
1da177e4 LT |
126 | goto out_unlock; |
127 | } | |
128 | break; | |
129 | default: | |
130 | break; | |
131 | } | |
132 | ||
133 | np = inet6_sk(sk); | |
134 | icmpv6_err_convert(type, code, &err); | |
135 | if (!sock_owned_by_user(sk) && np->recverr) { | |
136 | sk->sk_err = err; | |
137 | sk->sk_error_report(sk); | |
138 | } else { /* Only an error on timeout */ | |
139 | sk->sk_err_soft = err; | |
140 | } | |
141 | ||
142 | out_unlock: | |
d1ad1ff2 | 143 | sctp_err_finish(sk, asoc); |
1da177e4 LT |
144 | out: |
145 | if (likely(idev != NULL)) | |
146 | in6_dev_put(idev); | |
147 | } | |
148 | ||
149 | /* Based on tcp_v6_xmit() in tcp_ipv6.c. */ | |
150 | static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport, | |
151 | int ipfragok) | |
152 | { | |
153 | struct sock *sk = skb->sk; | |
154 | struct ipv6_pinfo *np = inet6_sk(sk); | |
155 | struct flowi fl; | |
156 | ||
157 | memset(&fl, 0, sizeof(fl)); | |
158 | ||
159 | fl.proto = sk->sk_protocol; | |
160 | ||
161 | /* Fill in the dest address from the route entry passed with the skb | |
162 | * and the source address from the transport. | |
163 | */ | |
09ef7fec AV |
164 | ipv6_addr_copy(&fl.fl6_dst, &transport->ipaddr_h.v6.sin6_addr); |
165 | ipv6_addr_copy(&fl.fl6_src, &transport->saddr_h.v6.sin6_addr); | |
1da177e4 LT |
166 | |
167 | fl.fl6_flowlabel = np->flow_label; | |
168 | IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel); | |
169 | if (ipv6_addr_type(&fl.fl6_src) & IPV6_ADDR_LINKLOCAL) | |
09ef7fec | 170 | fl.oif = transport->saddr_h.v6.sin6_scope_id; |
1da177e4 LT |
171 | else |
172 | fl.oif = sk->sk_bound_dev_if; | |
173 | fl.fl_ip_sport = inet_sk(sk)->sport; | |
09ef7fec | 174 | fl.fl_ip_dport = transport->ipaddr_h.v6.sin6_port; |
1da177e4 LT |
175 | |
176 | if (np->opt && np->opt->srcrt) { | |
177 | struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt; | |
178 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
179 | } | |
180 | ||
181 | SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, " | |
46b86a2d | 182 | "src:" NIP6_FMT " dst:" NIP6_FMT "\n", |
1da177e4 LT |
183 | __FUNCTION__, skb, skb->len, |
184 | NIP6(fl.fl6_src), NIP6(fl.fl6_dst)); | |
185 | ||
186 | SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS); | |
187 | ||
188 | return ip6_xmit(sk, skb, &fl, np->opt, ipfragok); | |
189 | } | |
190 | ||
191 | /* Returns the dst cache entry for the given source and destination ip | |
192 | * addresses. | |
193 | */ | |
194 | static struct dst_entry *sctp_v6_get_dst(struct sctp_association *asoc, | |
195 | union sctp_addr *daddr, | |
196 | union sctp_addr *saddr) | |
197 | { | |
198 | struct dst_entry *dst; | |
199 | struct flowi fl; | |
200 | ||
201 | memset(&fl, 0, sizeof(fl)); | |
202 | ipv6_addr_copy(&fl.fl6_dst, &daddr->v6.sin6_addr); | |
203 | if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) | |
204 | fl.oif = daddr->v6.sin6_scope_id; | |
205 | ||
206 | ||
46b86a2d | 207 | SCTP_DEBUG_PRINTK("%s: DST=" NIP6_FMT " ", |
1da177e4 LT |
208 | __FUNCTION__, NIP6(fl.fl6_dst)); |
209 | ||
210 | if (saddr) { | |
211 | ipv6_addr_copy(&fl.fl6_src, &saddr->v6.sin6_addr); | |
212 | SCTP_DEBUG_PRINTK( | |
46b86a2d | 213 | "SRC=" NIP6_FMT " - ", |
1da177e4 LT |
214 | NIP6(fl.fl6_src)); |
215 | } | |
216 | ||
217 | dst = ip6_route_output(NULL, &fl); | |
4251320f | 218 | if (!dst->error) { |
1da177e4 LT |
219 | struct rt6_info *rt; |
220 | rt = (struct rt6_info *)dst; | |
221 | SCTP_DEBUG_PRINTK( | |
46b86a2d | 222 | "rt6_dst:" NIP6_FMT " rt6_src:" NIP6_FMT "\n", |
1da177e4 | 223 | NIP6(rt->rt6i_dst.addr), NIP6(rt->rt6i_src.addr)); |
4251320f | 224 | return dst; |
1da177e4 | 225 | } |
4251320f VN |
226 | SCTP_DEBUG_PRINTK("NO ROUTE\n"); |
227 | dst_release(dst); | |
228 | return NULL; | |
1da177e4 LT |
229 | } |
230 | ||
231 | /* Returns the number of consecutive initial bits that match in the 2 ipv6 | |
232 | * addresses. | |
233 | */ | |
234 | static inline int sctp_v6_addr_match_len(union sctp_addr *s1, | |
235 | union sctp_addr *s2) | |
236 | { | |
237 | struct in6_addr *a1 = &s1->v6.sin6_addr; | |
238 | struct in6_addr *a2 = &s2->v6.sin6_addr; | |
239 | int i, j; | |
240 | ||
241 | for (i = 0; i < 4 ; i++) { | |
dbc16db1 | 242 | __be32 a1xora2; |
1da177e4 LT |
243 | |
244 | a1xora2 = a1->s6_addr32[i] ^ a2->s6_addr32[i]; | |
245 | ||
246 | if ((j = fls(ntohl(a1xora2)))) | |
247 | return (i * 32 + 32 - j); | |
248 | } | |
249 | ||
250 | return (i*32); | |
251 | } | |
252 | ||
253 | /* Fills in the source address(saddr) based on the destination address(daddr) | |
254 | * and asoc's bind address list. | |
255 | */ | |
256 | static void sctp_v6_get_saddr(struct sctp_association *asoc, | |
257 | struct dst_entry *dst, | |
258 | union sctp_addr *daddr, | |
259 | union sctp_addr *saddr) | |
260 | { | |
261 | struct sctp_bind_addr *bp; | |
262 | rwlock_t *addr_lock; | |
263 | struct sctp_sockaddr_entry *laddr; | |
264 | struct list_head *pos; | |
265 | sctp_scope_t scope; | |
266 | union sctp_addr *baddr = NULL; | |
267 | __u8 matchlen = 0; | |
268 | __u8 bmatchlen; | |
269 | ||
270 | SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p " | |
46b86a2d | 271 | "daddr:" NIP6_FMT " ", |
1da177e4 LT |
272 | __FUNCTION__, asoc, dst, NIP6(daddr->v6.sin6_addr)); |
273 | ||
274 | if (!asoc) { | |
275 | ipv6_get_saddr(dst, &daddr->v6.sin6_addr,&saddr->v6.sin6_addr); | |
46b86a2d | 276 | SCTP_DEBUG_PRINTK("saddr from ipv6_get_saddr: " NIP6_FMT "\n", |
1da177e4 LT |
277 | NIP6(saddr->v6.sin6_addr)); |
278 | return; | |
279 | } | |
280 | ||
281 | scope = sctp_scope(daddr); | |
282 | ||
283 | bp = &asoc->base.bind_addr; | |
284 | addr_lock = &asoc->base.addr_lock; | |
285 | ||
286 | /* Go through the bind address list and find the best source address | |
287 | * that matches the scope of the destination address. | |
288 | */ | |
289 | sctp_read_lock(addr_lock); | |
290 | list_for_each(pos, &bp->address_list) { | |
291 | laddr = list_entry(pos, struct sctp_sockaddr_entry, list); | |
dc022a98 | 292 | if ((laddr->use_as_src) && |
09ef7fec AV |
293 | (laddr->a_h.sa.sa_family == AF_INET6) && |
294 | (scope <= sctp_scope(&laddr->a_h))) { | |
d3f7a54a | 295 | bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a); |
1da177e4 | 296 | if (!baddr || (matchlen < bmatchlen)) { |
d3f7a54a | 297 | baddr = &laddr->a; |
1da177e4 LT |
298 | matchlen = bmatchlen; |
299 | } | |
300 | } | |
301 | } | |
302 | ||
303 | if (baddr) { | |
304 | memcpy(saddr, baddr, sizeof(union sctp_addr)); | |
46b86a2d | 305 | SCTP_DEBUG_PRINTK("saddr: " NIP6_FMT "\n", |
1da177e4 LT |
306 | NIP6(saddr->v6.sin6_addr)); |
307 | } else { | |
308 | printk(KERN_ERR "%s: asoc:%p Could not find a valid source " | |
46b86a2d | 309 | "address for the dest:" NIP6_FMT "\n", |
1da177e4 LT |
310 | __FUNCTION__, asoc, NIP6(daddr->v6.sin6_addr)); |
311 | } | |
312 | ||
313 | sctp_read_unlock(addr_lock); | |
314 | } | |
315 | ||
316 | /* Make a copy of all potential local addresses. */ | |
317 | static void sctp_v6_copy_addrlist(struct list_head *addrlist, | |
318 | struct net_device *dev) | |
319 | { | |
320 | struct inet6_dev *in6_dev; | |
321 | struct inet6_ifaddr *ifp; | |
322 | struct sctp_sockaddr_entry *addr; | |
323 | ||
8814c4b5 | 324 | rcu_read_lock(); |
1da177e4 | 325 | if ((in6_dev = __in6_dev_get(dev)) == NULL) { |
8814c4b5 | 326 | rcu_read_unlock(); |
1da177e4 LT |
327 | return; |
328 | } | |
329 | ||
330 | read_lock(&in6_dev->lock); | |
331 | for (ifp = in6_dev->addr_list; ifp; ifp = ifp->if_next) { | |
332 | /* Add the address to the local list. */ | |
333 | addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC); | |
334 | if (addr) { | |
2a6fd78a AV |
335 | addr->a.v6.sin6_family = AF_INET6; |
336 | addr->a.v6.sin6_port = 0; | |
337 | addr->a.v6.sin6_addr = ifp->addr; | |
338 | addr->a.v6.sin6_scope_id = dev->ifindex; | |
339 | addr->a_h = addr->a; | |
1da177e4 LT |
340 | INIT_LIST_HEAD(&addr->list); |
341 | list_add_tail(&addr->list, addrlist); | |
342 | } | |
343 | } | |
344 | ||
345 | read_unlock(&in6_dev->lock); | |
8814c4b5 | 346 | rcu_read_unlock(); |
1da177e4 LT |
347 | } |
348 | ||
349 | /* Initialize a sockaddr_storage from in incoming skb. */ | |
350 | static void sctp_v6_from_skb(union sctp_addr *addr,struct sk_buff *skb, | |
351 | int is_saddr) | |
352 | { | |
353 | void *from; | |
d55c41b1 | 354 | __be16 *port; |
1da177e4 LT |
355 | struct sctphdr *sh; |
356 | ||
357 | port = &addr->v6.sin6_port; | |
358 | addr->v6.sin6_family = AF_INET6; | |
359 | addr->v6.sin6_flowinfo = 0; /* FIXME */ | |
360 | addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif; | |
361 | ||
362 | sh = (struct sctphdr *) skb->h.raw; | |
363 | if (is_saddr) { | |
d55c41b1 | 364 | *port = sh->source; |
1da177e4 LT |
365 | from = &skb->nh.ipv6h->saddr; |
366 | } else { | |
d55c41b1 | 367 | *port = sh->dest; |
1da177e4 LT |
368 | from = &skb->nh.ipv6h->daddr; |
369 | } | |
370 | ipv6_addr_copy(&addr->v6.sin6_addr, from); | |
371 | } | |
372 | ||
373 | /* Initialize an sctp_addr from a socket. */ | |
374 | static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk) | |
375 | { | |
376 | addr->v6.sin6_family = AF_INET6; | |
377 | addr->v6.sin6_port = inet_sk(sk)->num; | |
378 | addr->v6.sin6_addr = inet6_sk(sk)->rcv_saddr; | |
379 | } | |
380 | ||
381 | /* Initialize sk->sk_rcv_saddr from sctp_addr. */ | |
382 | static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk) | |
383 | { | |
384 | if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) { | |
385 | inet6_sk(sk)->rcv_saddr.s6_addr32[0] = 0; | |
386 | inet6_sk(sk)->rcv_saddr.s6_addr32[1] = 0; | |
387 | inet6_sk(sk)->rcv_saddr.s6_addr32[2] = htonl(0x0000ffff); | |
388 | inet6_sk(sk)->rcv_saddr.s6_addr32[3] = | |
389 | addr->v4.sin_addr.s_addr; | |
390 | } else { | |
391 | inet6_sk(sk)->rcv_saddr = addr->v6.sin6_addr; | |
392 | } | |
393 | } | |
394 | ||
395 | /* Initialize sk->sk_daddr from sctp_addr. */ | |
396 | static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk) | |
397 | { | |
398 | if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) { | |
399 | inet6_sk(sk)->daddr.s6_addr32[0] = 0; | |
400 | inet6_sk(sk)->daddr.s6_addr32[1] = 0; | |
401 | inet6_sk(sk)->daddr.s6_addr32[2] = htonl(0x0000ffff); | |
402 | inet6_sk(sk)->daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr; | |
403 | } else { | |
404 | inet6_sk(sk)->daddr = addr->v6.sin6_addr; | |
405 | } | |
406 | } | |
407 | ||
408 | /* Initialize a sctp_addr from an address parameter. */ | |
409 | static void sctp_v6_from_addr_param(union sctp_addr *addr, | |
410 | union sctp_addr_param *param, | |
dd86d136 | 411 | __be16 port, int iif) |
1da177e4 LT |
412 | { |
413 | addr->v6.sin6_family = AF_INET6; | |
414 | addr->v6.sin6_port = port; | |
415 | addr->v6.sin6_flowinfo = 0; /* BUG */ | |
416 | ipv6_addr_copy(&addr->v6.sin6_addr, ¶m->v6.addr); | |
417 | addr->v6.sin6_scope_id = iif; | |
418 | } | |
419 | ||
420 | /* Initialize an address parameter from a sctp_addr and return the length | |
421 | * of the address parameter. | |
422 | */ | |
423 | static int sctp_v6_to_addr_param(const union sctp_addr *addr, | |
424 | union sctp_addr_param *param) | |
425 | { | |
426 | int length = sizeof(sctp_ipv6addr_param_t); | |
427 | ||
428 | param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS; | |
dbc16db1 | 429 | param->v6.param_hdr.length = htons(length); |
1da177e4 LT |
430 | ipv6_addr_copy(¶m->v6.addr, &addr->v6.sin6_addr); |
431 | ||
432 | return length; | |
433 | } | |
434 | ||
435 | /* Initialize a sctp_addr from a dst_entry. */ | |
436 | static void sctp_v6_dst_saddr(union sctp_addr *addr, struct dst_entry *dst, | |
854d43a4 | 437 | __be16 port) |
1da177e4 LT |
438 | { |
439 | struct rt6_info *rt = (struct rt6_info *)dst; | |
440 | addr->sa.sa_family = AF_INET6; | |
441 | addr->v6.sin6_port = port; | |
442 | ipv6_addr_copy(&addr->v6.sin6_addr, &rt->rt6i_src.addr); | |
443 | } | |
444 | ||
445 | /* Compare addresses exactly. | |
446 | * v4-mapped-v6 is also in consideration. | |
447 | */ | |
448 | static int sctp_v6_cmp_addr(const union sctp_addr *addr1, | |
449 | const union sctp_addr *addr2) | |
450 | { | |
451 | if (addr1->sa.sa_family != addr2->sa.sa_family) { | |
452 | if (addr1->sa.sa_family == AF_INET && | |
453 | addr2->sa.sa_family == AF_INET6 && | |
454 | IPV6_ADDR_MAPPED == ipv6_addr_type(&addr2->v6.sin6_addr)) { | |
455 | if (addr2->v6.sin6_port == addr1->v4.sin_port && | |
456 | addr2->v6.sin6_addr.s6_addr32[3] == | |
457 | addr1->v4.sin_addr.s_addr) | |
458 | return 1; | |
459 | } | |
460 | if (addr2->sa.sa_family == AF_INET && | |
461 | addr1->sa.sa_family == AF_INET6 && | |
462 | IPV6_ADDR_MAPPED == ipv6_addr_type(&addr1->v6.sin6_addr)) { | |
463 | if (addr1->v6.sin6_port == addr2->v4.sin_port && | |
464 | addr1->v6.sin6_addr.s6_addr32[3] == | |
465 | addr2->v4.sin_addr.s_addr) | |
466 | return 1; | |
467 | } | |
468 | return 0; | |
469 | } | |
470 | if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr)) | |
471 | return 0; | |
472 | /* If this is a linklocal address, compare the scope_id. */ | |
473 | if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) { | |
474 | if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id && | |
475 | (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) { | |
476 | return 0; | |
477 | } | |
478 | } | |
479 | ||
480 | return 1; | |
481 | } | |
482 | ||
483 | /* Initialize addr struct to INADDR_ANY. */ | |
484 | static void sctp_v6_inaddr_any(union sctp_addr *addr, unsigned short port) | |
485 | { | |
486 | memset(addr, 0x00, sizeof(union sctp_addr)); | |
487 | addr->v6.sin6_family = AF_INET6; | |
488 | addr->v6.sin6_port = port; | |
489 | } | |
490 | ||
491 | /* Is this a wildcard address? */ | |
492 | static int sctp_v6_is_any(const union sctp_addr *addr) | |
493 | { | |
b9b9e10f | 494 | return ipv6_addr_any(&addr->v6.sin6_addr); |
1da177e4 LT |
495 | } |
496 | ||
497 | /* Should this be available for binding? */ | |
498 | static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp) | |
499 | { | |
500 | int type; | |
501 | struct in6_addr *in6 = (struct in6_addr *)&addr->v6.sin6_addr; | |
502 | ||
503 | type = ipv6_addr_type(in6); | |
504 | if (IPV6_ADDR_ANY == type) | |
505 | return 1; | |
506 | if (type == IPV6_ADDR_MAPPED) { | |
507 | if (sp && !sp->v4mapped) | |
508 | return 0; | |
509 | if (sp && ipv6_only_sock(sctp_opt2sk(sp))) | |
510 | return 0; | |
511 | sctp_v6_map_v4(addr); | |
512 | return sctp_get_af_specific(AF_INET)->available(addr, sp); | |
513 | } | |
514 | if (!(type & IPV6_ADDR_UNICAST)) | |
515 | return 0; | |
516 | ||
517 | return ipv6_chk_addr(in6, NULL, 0); | |
518 | } | |
519 | ||
520 | /* This function checks if the address is a valid address to be used for | |
521 | * SCTP. | |
522 | * | |
523 | * Output: | |
524 | * Return 0 - If the address is a non-unicast or an illegal address. | |
525 | * Return 1 - If the address is a unicast. | |
526 | */ | |
5636bef7 VY |
527 | static int sctp_v6_addr_valid(union sctp_addr *addr, |
528 | struct sctp_sock *sp, | |
529 | const struct sk_buff *skb) | |
1da177e4 LT |
530 | { |
531 | int ret = ipv6_addr_type(&addr->v6.sin6_addr); | |
532 | ||
533 | /* Support v4-mapped-v6 address. */ | |
534 | if (ret == IPV6_ADDR_MAPPED) { | |
535 | /* Note: This routine is used in input, so v4-mapped-v6 | |
536 | * are disallowed here when there is no sctp_sock. | |
537 | */ | |
538 | if (!sp || !sp->v4mapped) | |
539 | return 0; | |
540 | if (sp && ipv6_only_sock(sctp_opt2sk(sp))) | |
541 | return 0; | |
542 | sctp_v6_map_v4(addr); | |
5636bef7 | 543 | return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb); |
1da177e4 LT |
544 | } |
545 | ||
546 | /* Is this a non-unicast address */ | |
547 | if (!(ret & IPV6_ADDR_UNICAST)) | |
548 | return 0; | |
549 | ||
550 | return 1; | |
551 | } | |
552 | ||
553 | /* What is the scope of 'addr'? */ | |
554 | static sctp_scope_t sctp_v6_scope(union sctp_addr *addr) | |
555 | { | |
556 | int v6scope; | |
557 | sctp_scope_t retval; | |
558 | ||
559 | /* The IPv6 scope is really a set of bit fields. | |
560 | * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope. | |
561 | */ | |
562 | ||
563 | v6scope = ipv6_addr_scope(&addr->v6.sin6_addr); | |
564 | switch (v6scope) { | |
565 | case IFA_HOST: | |
566 | retval = SCTP_SCOPE_LOOPBACK; | |
567 | break; | |
568 | case IFA_LINK: | |
569 | retval = SCTP_SCOPE_LINK; | |
570 | break; | |
571 | case IFA_SITE: | |
572 | retval = SCTP_SCOPE_PRIVATE; | |
573 | break; | |
574 | default: | |
575 | retval = SCTP_SCOPE_GLOBAL; | |
576 | break; | |
577 | }; | |
578 | ||
579 | return retval; | |
580 | } | |
581 | ||
582 | /* Create and initialize a new sk for the socket to be returned by accept(). */ | |
583 | static struct sock *sctp_v6_create_accept_sk(struct sock *sk, | |
584 | struct sctp_association *asoc) | |
585 | { | |
586 | struct inet_sock *inet = inet_sk(sk); | |
587 | struct sock *newsk; | |
588 | struct inet_sock *newinet; | |
589 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); | |
590 | struct sctp6_sock *newsctp6sk; | |
591 | ||
592 | newsk = sk_alloc(PF_INET6, GFP_KERNEL, sk->sk_prot, 1); | |
593 | if (!newsk) | |
594 | goto out; | |
595 | ||
596 | sock_init_data(NULL, newsk); | |
597 | ||
598 | newsk->sk_type = SOCK_STREAM; | |
599 | ||
600 | newsk->sk_prot = sk->sk_prot; | |
601 | newsk->sk_no_check = sk->sk_no_check; | |
602 | newsk->sk_reuse = sk->sk_reuse; | |
603 | ||
604 | newsk->sk_destruct = inet_sock_destruct; | |
605 | newsk->sk_family = PF_INET6; | |
606 | newsk->sk_protocol = IPPROTO_SCTP; | |
607 | newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; | |
608 | newsk->sk_shutdown = sk->sk_shutdown; | |
609 | sock_reset_flag(sk, SOCK_ZAPPED); | |
610 | ||
611 | newsctp6sk = (struct sctp6_sock *)newsk; | |
612 | inet_sk(newsk)->pinet6 = &newsctp6sk->inet6; | |
613 | ||
614 | newinet = inet_sk(newsk); | |
615 | newnp = inet6_sk(newsk); | |
616 | ||
617 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
618 | ||
619 | /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname() | |
620 | * and getpeername(). | |
621 | */ | |
622 | newinet->sport = inet->sport; | |
623 | newnp->saddr = np->saddr; | |
624 | newnp->rcv_saddr = np->rcv_saddr; | |
625 | newinet->dport = htons(asoc->peer.port); | |
626 | sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk); | |
627 | ||
628 | /* Init the ipv4 part of the socket since we can have sockets | |
629 | * using v6 API for ipv4. | |
630 | */ | |
631 | newinet->uc_ttl = -1; | |
632 | newinet->mc_loop = 1; | |
633 | newinet->mc_ttl = 1; | |
634 | newinet->mc_index = 0; | |
635 | newinet->mc_list = NULL; | |
636 | ||
637 | if (ipv4_config.no_pmtu_disc) | |
638 | newinet->pmtudisc = IP_PMTUDISC_DONT; | |
639 | else | |
640 | newinet->pmtudisc = IP_PMTUDISC_WANT; | |
641 | ||
e6848976 | 642 | sk_refcnt_debug_inc(newsk); |
1da177e4 LT |
643 | |
644 | if (newsk->sk_prot->init(newsk)) { | |
645 | sk_common_release(newsk); | |
646 | newsk = NULL; | |
647 | } | |
648 | ||
649 | out: | |
650 | return newsk; | |
651 | } | |
652 | ||
653 | /* Map v4 address to mapped v6 address */ | |
654 | static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr) | |
655 | { | |
656 | if (sp->v4mapped && AF_INET == addr->sa.sa_family) | |
657 | sctp_v4_map_v6(addr); | |
658 | } | |
659 | ||
660 | /* Where did this skb come from? */ | |
661 | static int sctp_v6_skb_iif(const struct sk_buff *skb) | |
662 | { | |
663 | struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb; | |
664 | return opt->iif; | |
665 | } | |
666 | ||
667 | /* Was this packet marked by Explicit Congestion Notification? */ | |
668 | static int sctp_v6_is_ce(const struct sk_buff *skb) | |
669 | { | |
670 | return *((__u32 *)(skb->nh.ipv6h)) & htonl(1<<20); | |
671 | } | |
672 | ||
673 | /* Dump the v6 addr to the seq file. */ | |
674 | static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr) | |
675 | { | |
46b86a2d | 676 | seq_printf(seq, NIP6_FMT " ", NIP6(addr->v6.sin6_addr)); |
1da177e4 LT |
677 | } |
678 | ||
679 | /* Initialize a PF_INET6 socket msg_name. */ | |
680 | static void sctp_inet6_msgname(char *msgname, int *addr_len) | |
681 | { | |
682 | struct sockaddr_in6 *sin6; | |
683 | ||
684 | sin6 = (struct sockaddr_in6 *)msgname; | |
685 | sin6->sin6_family = AF_INET6; | |
686 | sin6->sin6_flowinfo = 0; | |
687 | sin6->sin6_scope_id = 0; /*FIXME */ | |
688 | *addr_len = sizeof(struct sockaddr_in6); | |
689 | } | |
690 | ||
691 | /* Initialize a PF_INET msgname from a ulpevent. */ | |
692 | static void sctp_inet6_event_msgname(struct sctp_ulpevent *event, | |
693 | char *msgname, int *addrlen) | |
694 | { | |
695 | struct sockaddr_in6 *sin6, *sin6from; | |
696 | ||
697 | if (msgname) { | |
698 | union sctp_addr *addr; | |
699 | struct sctp_association *asoc; | |
700 | ||
701 | asoc = event->asoc; | |
702 | sctp_inet6_msgname(msgname, addrlen); | |
703 | sin6 = (struct sockaddr_in6 *)msgname; | |
704 | sin6->sin6_port = htons(asoc->peer.port); | |
705 | addr = &asoc->peer.primary_addr; | |
706 | ||
707 | /* Note: If we go to a common v6 format, this code | |
708 | * will change. | |
709 | */ | |
710 | ||
711 | /* Map ipv4 address into v4-mapped-on-v6 address. */ | |
712 | if (sctp_sk(asoc->base.sk)->v4mapped && | |
713 | AF_INET == addr->sa.sa_family) { | |
714 | sctp_v4_map_v6((union sctp_addr *)sin6); | |
715 | sin6->sin6_addr.s6_addr32[3] = | |
716 | addr->v4.sin_addr.s_addr; | |
717 | return; | |
718 | } | |
719 | ||
720 | sin6from = &asoc->peer.primary_addr.v6; | |
721 | ipv6_addr_copy(&sin6->sin6_addr, &sin6from->sin6_addr); | |
722 | if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) | |
723 | sin6->sin6_scope_id = sin6from->sin6_scope_id; | |
724 | } | |
725 | } | |
726 | ||
727 | /* Initialize a msg_name from an inbound skb. */ | |
728 | static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname, | |
729 | int *addr_len) | |
730 | { | |
731 | struct sctphdr *sh; | |
732 | struct sockaddr_in6 *sin6; | |
733 | ||
734 | if (msgname) { | |
735 | sctp_inet6_msgname(msgname, addr_len); | |
736 | sin6 = (struct sockaddr_in6 *)msgname; | |
737 | sh = (struct sctphdr *)skb->h.raw; | |
738 | sin6->sin6_port = sh->source; | |
739 | ||
740 | /* Map ipv4 address into v4-mapped-on-v6 address. */ | |
741 | if (sctp_sk(skb->sk)->v4mapped && | |
742 | skb->nh.iph->version == 4) { | |
743 | sctp_v4_map_v6((union sctp_addr *)sin6); | |
744 | sin6->sin6_addr.s6_addr32[3] = skb->nh.iph->saddr; | |
745 | return; | |
746 | } | |
747 | ||
748 | /* Otherwise, just copy the v6 address. */ | |
749 | ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr); | |
750 | if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) { | |
751 | struct sctp_ulpevent *ev = sctp_skb2event(skb); | |
752 | sin6->sin6_scope_id = ev->iif; | |
753 | } | |
754 | } | |
755 | } | |
756 | ||
757 | /* Do we support this AF? */ | |
758 | static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp) | |
759 | { | |
760 | switch (family) { | |
761 | case AF_INET6: | |
762 | return 1; | |
763 | /* v4-mapped-v6 addresses */ | |
764 | case AF_INET: | |
765 | if (!__ipv6_only_sock(sctp_opt2sk(sp)) && sp->v4mapped) | |
766 | return 1; | |
767 | default: | |
768 | return 0; | |
769 | } | |
770 | } | |
771 | ||
772 | /* Address matching with wildcards allowed. This extra level | |
773 | * of indirection lets us choose whether a PF_INET6 should | |
774 | * disallow any v4 addresses if we so choose. | |
775 | */ | |
776 | static int sctp_inet6_cmp_addr(const union sctp_addr *addr1, | |
777 | const union sctp_addr *addr2, | |
778 | struct sctp_sock *opt) | |
779 | { | |
780 | struct sctp_af *af1, *af2; | |
781 | ||
782 | af1 = sctp_get_af_specific(addr1->sa.sa_family); | |
783 | af2 = sctp_get_af_specific(addr2->sa.sa_family); | |
784 | ||
785 | if (!af1 || !af2) | |
786 | return 0; | |
787 | /* Today, wildcard AF_INET/AF_INET6. */ | |
788 | if (sctp_is_any(addr1) || sctp_is_any(addr2)) | |
789 | return 1; | |
790 | ||
791 | if (addr1->sa.sa_family != addr2->sa.sa_family) | |
792 | return 0; | |
793 | ||
794 | return af1->cmp_addr(addr1, addr2); | |
795 | } | |
796 | ||
797 | /* Verify that the provided sockaddr looks bindable. Common verification, | |
798 | * has already been taken care of. | |
799 | */ | |
800 | static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) | |
801 | { | |
802 | struct sctp_af *af; | |
803 | ||
804 | /* ASSERT: address family has already been verified. */ | |
805 | if (addr->sa.sa_family != AF_INET6) | |
806 | af = sctp_get_af_specific(addr->sa.sa_family); | |
807 | else { | |
1da177e4 | 808 | int type = ipv6_addr_type(&addr->v6.sin6_addr); |
6a6ddb2a SS |
809 | struct net_device *dev; |
810 | ||
1da177e4 | 811 | if (type & IPV6_ADDR_LINKLOCAL) { |
6a6ddb2a SS |
812 | if (!addr->v6.sin6_scope_id) |
813 | return 0; | |
814 | dev = dev_get_by_index(addr->v6.sin6_scope_id); | |
815 | if (!dev) | |
1da177e4 | 816 | return 0; |
6a6ddb2a | 817 | dev_put(dev); |
1da177e4 LT |
818 | } |
819 | af = opt->pf->af; | |
820 | } | |
821 | return af->available(addr, opt); | |
822 | } | |
823 | ||
6a6ddb2a | 824 | /* Verify that the provided sockaddr looks sendable. Common verification, |
1da177e4 LT |
825 | * has already been taken care of. |
826 | */ | |
827 | static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr) | |
828 | { | |
829 | struct sctp_af *af = NULL; | |
830 | ||
831 | /* ASSERT: address family has already been verified. */ | |
832 | if (addr->sa.sa_family != AF_INET6) | |
833 | af = sctp_get_af_specific(addr->sa.sa_family); | |
834 | else { | |
1da177e4 | 835 | int type = ipv6_addr_type(&addr->v6.sin6_addr); |
6a6ddb2a SS |
836 | struct net_device *dev; |
837 | ||
1da177e4 | 838 | if (type & IPV6_ADDR_LINKLOCAL) { |
6a6ddb2a SS |
839 | if (!addr->v6.sin6_scope_id) |
840 | return 0; | |
841 | dev = dev_get_by_index(addr->v6.sin6_scope_id); | |
842 | if (!dev) | |
1da177e4 | 843 | return 0; |
6a6ddb2a | 844 | dev_put(dev); |
1da177e4 LT |
845 | } |
846 | af = opt->pf->af; | |
847 | } | |
848 | ||
849 | return af != NULL; | |
850 | } | |
851 | ||
852 | /* Fill in Supported Address Type information for INIT and INIT-ACK | |
853 | * chunks. Note: In the future, we may want to look at sock options | |
854 | * to determine whether a PF_INET6 socket really wants to have IPV4 | |
855 | * addresses. | |
856 | * Returns number of addresses supported. | |
857 | */ | |
858 | static int sctp_inet6_supported_addrs(const struct sctp_sock *opt, | |
859 | __u16 *types) | |
860 | { | |
861 | types[0] = SCTP_PARAM_IPV4_ADDRESS; | |
862 | types[1] = SCTP_PARAM_IPV6_ADDRESS; | |
863 | return 2; | |
864 | } | |
865 | ||
90ddc4f0 | 866 | static const struct proto_ops inet6_seqpacket_ops = { |
543d9cfe ACM |
867 | .family = PF_INET6, |
868 | .owner = THIS_MODULE, | |
869 | .release = inet6_release, | |
870 | .bind = inet6_bind, | |
871 | .connect = inet_dgram_connect, | |
872 | .socketpair = sock_no_socketpair, | |
873 | .accept = inet_accept, | |
874 | .getname = inet6_getname, | |
875 | .poll = sctp_poll, | |
876 | .ioctl = inet6_ioctl, | |
877 | .listen = sctp_inet_listen, | |
878 | .shutdown = inet_shutdown, | |
879 | .setsockopt = sock_common_setsockopt, | |
880 | .getsockopt = sock_common_getsockopt, | |
881 | .sendmsg = inet_sendmsg, | |
882 | .recvmsg = sock_common_recvmsg, | |
883 | .mmap = sock_no_mmap, | |
3fdadf7d | 884 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
885 | .compat_setsockopt = compat_sock_common_setsockopt, |
886 | .compat_getsockopt = compat_sock_common_getsockopt, | |
3fdadf7d | 887 | #endif |
1da177e4 LT |
888 | }; |
889 | ||
890 | static struct inet_protosw sctpv6_seqpacket_protosw = { | |
891 | .type = SOCK_SEQPACKET, | |
892 | .protocol = IPPROTO_SCTP, | |
893 | .prot = &sctpv6_prot, | |
894 | .ops = &inet6_seqpacket_ops, | |
895 | .capability = -1, | |
896 | .no_check = 0, | |
897 | .flags = SCTP_PROTOSW_FLAG | |
898 | }; | |
899 | static struct inet_protosw sctpv6_stream_protosw = { | |
900 | .type = SOCK_STREAM, | |
901 | .protocol = IPPROTO_SCTP, | |
902 | .prot = &sctpv6_prot, | |
903 | .ops = &inet6_seqpacket_ops, | |
904 | .capability = -1, | |
905 | .no_check = 0, | |
906 | .flags = SCTP_PROTOSW_FLAG, | |
907 | }; | |
908 | ||
951dbc8a | 909 | static int sctp6_rcv(struct sk_buff **pskb) |
1da177e4 LT |
910 | { |
911 | return sctp_rcv(*pskb) ? -1 : 0; | |
912 | } | |
913 | ||
914 | static struct inet6_protocol sctpv6_protocol = { | |
915 | .handler = sctp6_rcv, | |
916 | .err_handler = sctp_v6_err, | |
917 | .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, | |
918 | }; | |
919 | ||
920 | static struct sctp_af sctp_ipv6_specific = { | |
543d9cfe ACM |
921 | .sa_family = AF_INET6, |
922 | .sctp_xmit = sctp_v6_xmit, | |
923 | .setsockopt = ipv6_setsockopt, | |
924 | .getsockopt = ipv6_getsockopt, | |
925 | .get_dst = sctp_v6_get_dst, | |
926 | .get_saddr = sctp_v6_get_saddr, | |
927 | .copy_addrlist = sctp_v6_copy_addrlist, | |
928 | .from_skb = sctp_v6_from_skb, | |
929 | .from_sk = sctp_v6_from_sk, | |
930 | .to_sk_saddr = sctp_v6_to_sk_saddr, | |
931 | .to_sk_daddr = sctp_v6_to_sk_daddr, | |
932 | .from_addr_param = sctp_v6_from_addr_param, | |
933 | .to_addr_param = sctp_v6_to_addr_param, | |
934 | .dst_saddr = sctp_v6_dst_saddr, | |
935 | .cmp_addr = sctp_v6_cmp_addr, | |
936 | .scope = sctp_v6_scope, | |
937 | .addr_valid = sctp_v6_addr_valid, | |
938 | .inaddr_any = sctp_v6_inaddr_any, | |
939 | .is_any = sctp_v6_is_any, | |
940 | .available = sctp_v6_available, | |
941 | .skb_iif = sctp_v6_skb_iif, | |
942 | .is_ce = sctp_v6_is_ce, | |
943 | .seq_dump_addr = sctp_v6_seq_dump_addr, | |
944 | .net_header_len = sizeof(struct ipv6hdr), | |
945 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
3fdadf7d | 946 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
947 | .compat_setsockopt = compat_ipv6_setsockopt, |
948 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 949 | #endif |
1da177e4 LT |
950 | }; |
951 | ||
952 | static struct sctp_pf sctp_pf_inet6_specific = { | |
953 | .event_msgname = sctp_inet6_event_msgname, | |
954 | .skb_msgname = sctp_inet6_skb_msgname, | |
955 | .af_supported = sctp_inet6_af_supported, | |
956 | .cmp_addr = sctp_inet6_cmp_addr, | |
957 | .bind_verify = sctp_inet6_bind_verify, | |
958 | .send_verify = sctp_inet6_send_verify, | |
959 | .supported_addrs = sctp_inet6_supported_addrs, | |
960 | .create_accept_sk = sctp_v6_create_accept_sk, | |
961 | .addr_v4map = sctp_v6_addr_v4map, | |
962 | .af = &sctp_ipv6_specific, | |
963 | }; | |
964 | ||
965 | /* Initialize IPv6 support and register with inet6 stack. */ | |
966 | int sctp_v6_init(void) | |
967 | { | |
968 | int rc = proto_register(&sctpv6_prot, 1); | |
969 | ||
970 | if (rc) | |
971 | goto out; | |
972 | /* Register inet6 protocol. */ | |
973 | rc = -EAGAIN; | |
974 | if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0) | |
975 | goto out_unregister_sctp_proto; | |
976 | ||
977 | /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */ | |
978 | inet6_register_protosw(&sctpv6_seqpacket_protosw); | |
979 | inet6_register_protosw(&sctpv6_stream_protosw); | |
980 | ||
981 | /* Register the SCTP specific PF_INET6 functions. */ | |
982 | sctp_register_pf(&sctp_pf_inet6_specific, PF_INET6); | |
983 | ||
984 | /* Register the SCTP specific AF_INET6 functions. */ | |
985 | sctp_register_af(&sctp_ipv6_specific); | |
986 | ||
987 | /* Register notifier for inet6 address additions/deletions. */ | |
988 | register_inet6addr_notifier(&sctp_inet6addr_notifier); | |
989 | rc = 0; | |
990 | out: | |
991 | return rc; | |
992 | out_unregister_sctp_proto: | |
993 | proto_unregister(&sctpv6_prot); | |
994 | goto out; | |
995 | } | |
996 | ||
997 | /* IPv6 specific exit support. */ | |
998 | void sctp_v6_exit(void) | |
999 | { | |
1000 | list_del(&sctp_ipv6_specific.list); | |
1001 | inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP); | |
1002 | inet6_unregister_protosw(&sctpv6_seqpacket_protosw); | |
1003 | inet6_unregister_protosw(&sctpv6_stream_protosw); | |
1004 | unregister_inet6addr_notifier(&sctp_inet6addr_notifier); | |
1005 | proto_unregister(&sctpv6_prot); | |
1006 | } |