blob: d8d36dee5ab6b91693e23800afb5ffd2ca5c7b36 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* 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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070069#include <net/ndisc.h>
Arnaldo Carvalho de Meloc752f072005-08-09 20:08:28 -070070#include <net/ip.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070071#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
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -080081/* Event handler for inet6 address addition/deletion events. */
82int sctp_inet6addr_event(struct notifier_block *this, unsigned long ev,
83 void *ptr)
84{
85 struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
86 struct sctp_sockaddr_entry *addr;
87 struct list_head *pos, *temp;
88
89 switch (ev) {
90 case NETDEV_UP:
91 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
92 if (addr) {
93 addr->a.v6.sin6_family = AF_INET6;
94 addr->a.v6.sin6_port = 0;
95 memcpy(&addr->a.v6.sin6_addr, &ifa->addr,
96 sizeof(struct in6_addr));
97 addr->a.v6.sin6_scope_id = ifa->idev->dev->ifindex;
98 list_add_tail(&addr->list, &sctp_local_addr_list);
99 }
100 break;
101 case NETDEV_DOWN:
102 list_for_each_safe(pos, temp, &sctp_local_addr_list) {
103 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
104 if (ipv6_addr_equal(&addr->a.v6.sin6_addr, &ifa->addr)) {
105 list_del(pos);
106 kfree(addr);
107 break;
108 }
109 }
110
111 break;
112 }
113
114 return NOTIFY_DONE;
115}
116
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117static struct notifier_block sctp_inet6addr_notifier = {
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800118 .notifier_call = sctp_inet6addr_event,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119};
120
121/* ICMP error handler. */
122SCTP_STATIC void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Al Viro04ce6902006-11-08 00:21:01 -0800123 int type, int code, int offset, __be32 info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124{
125 struct inet6_dev *idev;
126 struct ipv6hdr *iph = (struct ipv6hdr *)skb->data;
127 struct sctphdr *sh = (struct sctphdr *)(skb->data + offset);
128 struct sock *sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 struct sctp_association *asoc;
130 struct sctp_transport *transport;
131 struct ipv6_pinfo *np;
132 char *saveip, *savesctp;
133 int err;
134
135 idev = in6_dev_get(skb->dev);
136
137 /* Fix up skb to look at the embedded net header. */
138 saveip = skb->nh.raw;
139 savesctp = skb->h.raw;
140 skb->nh.ipv6h = iph;
141 skb->h.raw = (char *)sh;
Sridhar Samudralad1ad1ff2005-07-18 13:44:10 -0700142 sk = sctp_err_lookup(AF_INET6, skb, sh, &asoc, &transport);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 /* Put back, the original pointers. */
144 skb->nh.raw = saveip;
145 skb->h.raw = savesctp;
146 if (!sk) {
147 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INERRORS);
148 goto out;
149 }
150
151 /* Warning: The sock lock is held. Remember to call
152 * sctp_err_finish!
153 */
154
155 switch (type) {
156 case ICMPV6_PKT_TOOBIG:
157 sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info));
158 goto out_unlock;
159 case ICMPV6_PARAMPROB:
160 if (ICMPV6_UNK_NEXTHDR == code) {
Sridhar Samudralad1ad1ff2005-07-18 13:44:10 -0700161 sctp_icmp_proto_unreachable(sk, asoc, transport);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 goto out_unlock;
163 }
164 break;
165 default:
166 break;
167 }
168
169 np = inet6_sk(sk);
170 icmpv6_err_convert(type, code, &err);
171 if (!sock_owned_by_user(sk) && np->recverr) {
172 sk->sk_err = err;
173 sk->sk_error_report(sk);
174 } else { /* Only an error on timeout */
175 sk->sk_err_soft = err;
176 }
177
178out_unlock:
Sridhar Samudralad1ad1ff2005-07-18 13:44:10 -0700179 sctp_err_finish(sk, asoc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180out:
181 if (likely(idev != NULL))
182 in6_dev_put(idev);
183}
184
185/* Based on tcp_v6_xmit() in tcp_ipv6.c. */
186static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport,
187 int ipfragok)
188{
189 struct sock *sk = skb->sk;
190 struct ipv6_pinfo *np = inet6_sk(sk);
191 struct flowi fl;
192
193 memset(&fl, 0, sizeof(fl));
194
195 fl.proto = sk->sk_protocol;
196
197 /* Fill in the dest address from the route entry passed with the skb
198 * and the source address from the transport.
199 */
Al Virob3f5b3b2006-11-20 17:22:43 -0800200 ipv6_addr_copy(&fl.fl6_dst, &transport->ipaddr.v6.sin6_addr);
Al Viroa9266262006-11-20 17:13:58 -0800201 ipv6_addr_copy(&fl.fl6_src, &transport->saddr.v6.sin6_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202
203 fl.fl6_flowlabel = np->flow_label;
204 IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel);
205 if (ipv6_addr_type(&fl.fl6_src) & IPV6_ADDR_LINKLOCAL)
Al Viroa9266262006-11-20 17:13:58 -0800206 fl.oif = transport->saddr.v6.sin6_scope_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 else
208 fl.oif = sk->sk_bound_dev_if;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209
210 if (np->opt && np->opt->srcrt) {
211 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
212 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
213 }
214
215 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, "
Joe Perches46b86a22006-01-13 14:29:07 -0800216 "src:" NIP6_FMT " dst:" NIP6_FMT "\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 __FUNCTION__, skb, skb->len,
218 NIP6(fl.fl6_src), NIP6(fl.fl6_dst));
219
220 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
221
222 return ip6_xmit(sk, skb, &fl, np->opt, ipfragok);
223}
224
225/* Returns the dst cache entry for the given source and destination ip
226 * addresses.
227 */
228static struct dst_entry *sctp_v6_get_dst(struct sctp_association *asoc,
229 union sctp_addr *daddr,
230 union sctp_addr *saddr)
231{
232 struct dst_entry *dst;
233 struct flowi fl;
234
235 memset(&fl, 0, sizeof(fl));
236 ipv6_addr_copy(&fl.fl6_dst, &daddr->v6.sin6_addr);
237 if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
238 fl.oif = daddr->v6.sin6_scope_id;
239
240
Joe Perches46b86a22006-01-13 14:29:07 -0800241 SCTP_DEBUG_PRINTK("%s: DST=" NIP6_FMT " ",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 __FUNCTION__, NIP6(fl.fl6_dst));
243
244 if (saddr) {
245 ipv6_addr_copy(&fl.fl6_src, &saddr->v6.sin6_addr);
246 SCTP_DEBUG_PRINTK(
Joe Perches46b86a22006-01-13 14:29:07 -0800247 "SRC=" NIP6_FMT " - ",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 NIP6(fl.fl6_src));
249 }
250
251 dst = ip6_route_output(NULL, &fl);
Ville Nuorvala42513202006-10-16 22:10:05 -0700252 if (!dst->error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 struct rt6_info *rt;
254 rt = (struct rt6_info *)dst;
255 SCTP_DEBUG_PRINTK(
Joe Perches46b86a22006-01-13 14:29:07 -0800256 "rt6_dst:" NIP6_FMT " rt6_src:" NIP6_FMT "\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 NIP6(rt->rt6i_dst.addr), NIP6(rt->rt6i_src.addr));
Ville Nuorvala42513202006-10-16 22:10:05 -0700258 return dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 }
Ville Nuorvala42513202006-10-16 22:10:05 -0700260 SCTP_DEBUG_PRINTK("NO ROUTE\n");
261 dst_release(dst);
262 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263}
264
265/* Returns the number of consecutive initial bits that match in the 2 ipv6
266 * addresses.
267 */
268static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
269 union sctp_addr *s2)
270{
271 struct in6_addr *a1 = &s1->v6.sin6_addr;
272 struct in6_addr *a2 = &s2->v6.sin6_addr;
273 int i, j;
274
275 for (i = 0; i < 4 ; i++) {
Al Virodbc16db2006-11-20 17:01:42 -0800276 __be32 a1xora2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277
278 a1xora2 = a1->s6_addr32[i] ^ a2->s6_addr32[i];
279
280 if ((j = fls(ntohl(a1xora2))))
281 return (i * 32 + 32 - j);
282 }
283
284 return (i*32);
285}
286
287/* Fills in the source address(saddr) based on the destination address(daddr)
288 * and asoc's bind address list.
289 */
290static void sctp_v6_get_saddr(struct sctp_association *asoc,
291 struct dst_entry *dst,
292 union sctp_addr *daddr,
293 union sctp_addr *saddr)
294{
295 struct sctp_bind_addr *bp;
296 rwlock_t *addr_lock;
297 struct sctp_sockaddr_entry *laddr;
298 struct list_head *pos;
299 sctp_scope_t scope;
300 union sctp_addr *baddr = NULL;
301 __u8 matchlen = 0;
302 __u8 bmatchlen;
303
304 SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p "
Joe Perches46b86a22006-01-13 14:29:07 -0800305 "daddr:" NIP6_FMT " ",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 __FUNCTION__, asoc, dst, NIP6(daddr->v6.sin6_addr));
307
308 if (!asoc) {
309 ipv6_get_saddr(dst, &daddr->v6.sin6_addr,&saddr->v6.sin6_addr);
Joe Perches46b86a22006-01-13 14:29:07 -0800310 SCTP_DEBUG_PRINTK("saddr from ipv6_get_saddr: " NIP6_FMT "\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 NIP6(saddr->v6.sin6_addr));
312 return;
313 }
314
315 scope = sctp_scope(daddr);
316
317 bp = &asoc->base.bind_addr;
318 addr_lock = &asoc->base.addr_lock;
319
320 /* Go through the bind address list and find the best source address
321 * that matches the scope of the destination address.
322 */
323 sctp_read_lock(addr_lock);
324 list_for_each(pos, &bp->address_list) {
325 laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700326 if ((laddr->use_as_src) &&
Al Viro6244be42006-11-20 17:21:44 -0800327 (laddr->a.sa.sa_family == AF_INET6) &&
328 (scope <= sctp_scope(&laddr->a))) {
Al Virod3f7a542006-11-20 17:12:41 -0800329 bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 if (!baddr || (matchlen < bmatchlen)) {
Al Virod3f7a542006-11-20 17:12:41 -0800331 baddr = &laddr->a;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 matchlen = bmatchlen;
333 }
334 }
335 }
336
337 if (baddr) {
338 memcpy(saddr, baddr, sizeof(union sctp_addr));
Joe Perches46b86a22006-01-13 14:29:07 -0800339 SCTP_DEBUG_PRINTK("saddr: " NIP6_FMT "\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 NIP6(saddr->v6.sin6_addr));
341 } else {
342 printk(KERN_ERR "%s: asoc:%p Could not find a valid source "
Joe Perches46b86a22006-01-13 14:29:07 -0800343 "address for the dest:" NIP6_FMT "\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 __FUNCTION__, asoc, NIP6(daddr->v6.sin6_addr));
345 }
346
347 sctp_read_unlock(addr_lock);
348}
349
350/* Make a copy of all potential local addresses. */
351static void sctp_v6_copy_addrlist(struct list_head *addrlist,
352 struct net_device *dev)
353{
354 struct inet6_dev *in6_dev;
355 struct inet6_ifaddr *ifp;
356 struct sctp_sockaddr_entry *addr;
357
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -0700358 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 if ((in6_dev = __in6_dev_get(dev)) == NULL) {
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -0700360 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 return;
362 }
363
364 read_lock(&in6_dev->lock);
365 for (ifp = in6_dev->addr_list; ifp; ifp = ifp->if_next) {
366 /* Add the address to the local list. */
367 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
368 if (addr) {
Al Viro2a6fd782006-11-20 17:04:42 -0800369 addr->a.v6.sin6_family = AF_INET6;
370 addr->a.v6.sin6_port = 0;
371 addr->a.v6.sin6_addr = ifp->addr;
372 addr->a.v6.sin6_scope_id = dev->ifindex;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 INIT_LIST_HEAD(&addr->list);
374 list_add_tail(&addr->list, addrlist);
375 }
376 }
377
378 read_unlock(&in6_dev->lock);
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -0700379 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380}
381
382/* Initialize a sockaddr_storage from in incoming skb. */
383static void sctp_v6_from_skb(union sctp_addr *addr,struct sk_buff *skb,
384 int is_saddr)
385{
386 void *from;
Al Virod55c41b2006-11-20 17:09:40 -0800387 __be16 *port;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 struct sctphdr *sh;
389
390 port = &addr->v6.sin6_port;
391 addr->v6.sin6_family = AF_INET6;
392 addr->v6.sin6_flowinfo = 0; /* FIXME */
393 addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif;
394
395 sh = (struct sctphdr *) skb->h.raw;
396 if (is_saddr) {
Al Virod55c41b2006-11-20 17:09:40 -0800397 *port = sh->source;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 from = &skb->nh.ipv6h->saddr;
399 } else {
Al Virod55c41b2006-11-20 17:09:40 -0800400 *port = sh->dest;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 from = &skb->nh.ipv6h->daddr;
402 }
403 ipv6_addr_copy(&addr->v6.sin6_addr, from);
404}
405
406/* Initialize an sctp_addr from a socket. */
407static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk)
408{
409 addr->v6.sin6_family = AF_INET6;
Al Viro7dcdbd92006-11-20 17:24:21 -0800410 addr->v6.sin6_port = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 addr->v6.sin6_addr = inet6_sk(sk)->rcv_saddr;
412}
413
414/* Initialize sk->sk_rcv_saddr from sctp_addr. */
415static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
416{
417 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
418 inet6_sk(sk)->rcv_saddr.s6_addr32[0] = 0;
419 inet6_sk(sk)->rcv_saddr.s6_addr32[1] = 0;
420 inet6_sk(sk)->rcv_saddr.s6_addr32[2] = htonl(0x0000ffff);
421 inet6_sk(sk)->rcv_saddr.s6_addr32[3] =
422 addr->v4.sin_addr.s_addr;
423 } else {
424 inet6_sk(sk)->rcv_saddr = addr->v6.sin6_addr;
425 }
426}
427
428/* Initialize sk->sk_daddr from sctp_addr. */
429static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
430{
431 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
432 inet6_sk(sk)->daddr.s6_addr32[0] = 0;
433 inet6_sk(sk)->daddr.s6_addr32[1] = 0;
434 inet6_sk(sk)->daddr.s6_addr32[2] = htonl(0x0000ffff);
435 inet6_sk(sk)->daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
436 } else {
437 inet6_sk(sk)->daddr = addr->v6.sin6_addr;
438 }
439}
440
441/* Initialize a sctp_addr from an address parameter. */
442static void sctp_v6_from_addr_param(union sctp_addr *addr,
443 union sctp_addr_param *param,
Al Virodd86d132006-11-20 17:11:13 -0800444 __be16 port, int iif)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445{
446 addr->v6.sin6_family = AF_INET6;
447 addr->v6.sin6_port = port;
448 addr->v6.sin6_flowinfo = 0; /* BUG */
449 ipv6_addr_copy(&addr->v6.sin6_addr, &param->v6.addr);
450 addr->v6.sin6_scope_id = iif;
451}
452
453/* Initialize an address parameter from a sctp_addr and return the length
454 * of the address parameter.
455 */
456static int sctp_v6_to_addr_param(const union sctp_addr *addr,
457 union sctp_addr_param *param)
458{
459 int length = sizeof(sctp_ipv6addr_param_t);
460
461 param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS;
Al Virodbc16db2006-11-20 17:01:42 -0800462 param->v6.param_hdr.length = htons(length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 ipv6_addr_copy(&param->v6.addr, &addr->v6.sin6_addr);
464
465 return length;
466}
467
468/* Initialize a sctp_addr from a dst_entry. */
469static void sctp_v6_dst_saddr(union sctp_addr *addr, struct dst_entry *dst,
Al Viro854d43a2006-11-20 17:06:24 -0800470 __be16 port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471{
472 struct rt6_info *rt = (struct rt6_info *)dst;
473 addr->sa.sa_family = AF_INET6;
474 addr->v6.sin6_port = port;
475 ipv6_addr_copy(&addr->v6.sin6_addr, &rt->rt6i_src.addr);
476}
477
478/* Compare addresses exactly.
479 * v4-mapped-v6 is also in consideration.
480 */
481static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
482 const union sctp_addr *addr2)
483{
484 if (addr1->sa.sa_family != addr2->sa.sa_family) {
485 if (addr1->sa.sa_family == AF_INET &&
486 addr2->sa.sa_family == AF_INET6 &&
487 IPV6_ADDR_MAPPED == ipv6_addr_type(&addr2->v6.sin6_addr)) {
488 if (addr2->v6.sin6_port == addr1->v4.sin_port &&
489 addr2->v6.sin6_addr.s6_addr32[3] ==
490 addr1->v4.sin_addr.s_addr)
491 return 1;
492 }
493 if (addr2->sa.sa_family == AF_INET &&
494 addr1->sa.sa_family == AF_INET6 &&
495 IPV6_ADDR_MAPPED == ipv6_addr_type(&addr1->v6.sin6_addr)) {
496 if (addr1->v6.sin6_port == addr2->v4.sin_port &&
497 addr1->v6.sin6_addr.s6_addr32[3] ==
498 addr2->v4.sin_addr.s_addr)
499 return 1;
500 }
501 return 0;
502 }
503 if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr))
504 return 0;
505 /* If this is a linklocal address, compare the scope_id. */
506 if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) {
507 if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id &&
508 (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) {
509 return 0;
510 }
511 }
512
513 return 1;
514}
515
516/* Initialize addr struct to INADDR_ANY. */
Al Viro6fbfa9f2006-11-20 17:24:53 -0800517static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518{
519 memset(addr, 0x00, sizeof(union sctp_addr));
520 addr->v6.sin6_family = AF_INET6;
521 addr->v6.sin6_port = port;
522}
523
524/* Is this a wildcard address? */
525static int sctp_v6_is_any(const union sctp_addr *addr)
526{
Brian Haleyb9b9e102005-04-28 11:59:16 -0700527 return ipv6_addr_any(&addr->v6.sin6_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528}
529
530/* Should this be available for binding? */
531static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp)
532{
533 int type;
534 struct in6_addr *in6 = (struct in6_addr *)&addr->v6.sin6_addr;
535
536 type = ipv6_addr_type(in6);
537 if (IPV6_ADDR_ANY == type)
538 return 1;
539 if (type == IPV6_ADDR_MAPPED) {
540 if (sp && !sp->v4mapped)
541 return 0;
542 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
543 return 0;
544 sctp_v6_map_v4(addr);
545 return sctp_get_af_specific(AF_INET)->available(addr, sp);
546 }
547 if (!(type & IPV6_ADDR_UNICAST))
548 return 0;
549
550 return ipv6_chk_addr(in6, NULL, 0);
551}
552
553/* This function checks if the address is a valid address to be used for
554 * SCTP.
555 *
556 * Output:
557 * Return 0 - If the address is a non-unicast or an illegal address.
558 * Return 1 - If the address is a unicast.
559 */
Vlad Yasevich5636bef2006-06-17 22:55:35 -0700560static int sctp_v6_addr_valid(union sctp_addr *addr,
561 struct sctp_sock *sp,
562 const struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563{
564 int ret = ipv6_addr_type(&addr->v6.sin6_addr);
565
566 /* Support v4-mapped-v6 address. */
567 if (ret == IPV6_ADDR_MAPPED) {
568 /* Note: This routine is used in input, so v4-mapped-v6
569 * are disallowed here when there is no sctp_sock.
570 */
571 if (!sp || !sp->v4mapped)
572 return 0;
573 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
574 return 0;
575 sctp_v6_map_v4(addr);
Vlad Yasevich5636bef2006-06-17 22:55:35 -0700576 return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577 }
578
579 /* Is this a non-unicast address */
580 if (!(ret & IPV6_ADDR_UNICAST))
581 return 0;
582
583 return 1;
584}
585
586/* What is the scope of 'addr'? */
587static sctp_scope_t sctp_v6_scope(union sctp_addr *addr)
588{
589 int v6scope;
590 sctp_scope_t retval;
591
592 /* The IPv6 scope is really a set of bit fields.
593 * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope.
594 */
595
596 v6scope = ipv6_addr_scope(&addr->v6.sin6_addr);
597 switch (v6scope) {
598 case IFA_HOST:
599 retval = SCTP_SCOPE_LOOPBACK;
600 break;
601 case IFA_LINK:
602 retval = SCTP_SCOPE_LINK;
603 break;
604 case IFA_SITE:
605 retval = SCTP_SCOPE_PRIVATE;
606 break;
607 default:
608 retval = SCTP_SCOPE_GLOBAL;
609 break;
610 };
611
612 return retval;
613}
614
615/* Create and initialize a new sk for the socket to be returned by accept(). */
616static struct sock *sctp_v6_create_accept_sk(struct sock *sk,
617 struct sctp_association *asoc)
618{
619 struct inet_sock *inet = inet_sk(sk);
620 struct sock *newsk;
621 struct inet_sock *newinet;
622 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
623 struct sctp6_sock *newsctp6sk;
624
625 newsk = sk_alloc(PF_INET6, GFP_KERNEL, sk->sk_prot, 1);
626 if (!newsk)
627 goto out;
628
629 sock_init_data(NULL, newsk);
630
631 newsk->sk_type = SOCK_STREAM;
632
633 newsk->sk_prot = sk->sk_prot;
634 newsk->sk_no_check = sk->sk_no_check;
635 newsk->sk_reuse = sk->sk_reuse;
636
637 newsk->sk_destruct = inet_sock_destruct;
638 newsk->sk_family = PF_INET6;
639 newsk->sk_protocol = IPPROTO_SCTP;
640 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
641 newsk->sk_shutdown = sk->sk_shutdown;
642 sock_reset_flag(sk, SOCK_ZAPPED);
643
644 newsctp6sk = (struct sctp6_sock *)newsk;
645 inet_sk(newsk)->pinet6 = &newsctp6sk->inet6;
646
647 newinet = inet_sk(newsk);
648 newnp = inet6_sk(newsk);
649
650 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
651
652 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
653 * and getpeername().
654 */
655 newinet->sport = inet->sport;
656 newnp->saddr = np->saddr;
657 newnp->rcv_saddr = np->rcv_saddr;
658 newinet->dport = htons(asoc->peer.port);
659 sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);
660
661 /* Init the ipv4 part of the socket since we can have sockets
662 * using v6 API for ipv4.
663 */
664 newinet->uc_ttl = -1;
665 newinet->mc_loop = 1;
666 newinet->mc_ttl = 1;
667 newinet->mc_index = 0;
668 newinet->mc_list = NULL;
669
670 if (ipv4_config.no_pmtu_disc)
671 newinet->pmtudisc = IP_PMTUDISC_DONT;
672 else
673 newinet->pmtudisc = IP_PMTUDISC_WANT;
674
Arnaldo Carvalho de Meloe6848972005-08-09 19:45:38 -0700675 sk_refcnt_debug_inc(newsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676
677 if (newsk->sk_prot->init(newsk)) {
678 sk_common_release(newsk);
679 newsk = NULL;
680 }
681
682out:
683 return newsk;
684}
685
686/* Map v4 address to mapped v6 address */
687static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
688{
689 if (sp->v4mapped && AF_INET == addr->sa.sa_family)
690 sctp_v4_map_v6(addr);
691}
692
693/* Where did this skb come from? */
694static int sctp_v6_skb_iif(const struct sk_buff *skb)
695{
696 struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
697 return opt->iif;
698}
699
700/* Was this packet marked by Explicit Congestion Notification? */
701static int sctp_v6_is_ce(const struct sk_buff *skb)
702{
703 return *((__u32 *)(skb->nh.ipv6h)) & htonl(1<<20);
704}
705
706/* Dump the v6 addr to the seq file. */
707static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
708{
Joe Perches46b86a22006-01-13 14:29:07 -0800709 seq_printf(seq, NIP6_FMT " ", NIP6(addr->v6.sin6_addr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710}
711
712/* Initialize a PF_INET6 socket msg_name. */
713static void sctp_inet6_msgname(char *msgname, int *addr_len)
714{
715 struct sockaddr_in6 *sin6;
716
717 sin6 = (struct sockaddr_in6 *)msgname;
718 sin6->sin6_family = AF_INET6;
719 sin6->sin6_flowinfo = 0;
720 sin6->sin6_scope_id = 0; /*FIXME */
721 *addr_len = sizeof(struct sockaddr_in6);
722}
723
724/* Initialize a PF_INET msgname from a ulpevent. */
725static void sctp_inet6_event_msgname(struct sctp_ulpevent *event,
726 char *msgname, int *addrlen)
727{
728 struct sockaddr_in6 *sin6, *sin6from;
729
730 if (msgname) {
731 union sctp_addr *addr;
732 struct sctp_association *asoc;
733
734 asoc = event->asoc;
735 sctp_inet6_msgname(msgname, addrlen);
736 sin6 = (struct sockaddr_in6 *)msgname;
737 sin6->sin6_port = htons(asoc->peer.port);
738 addr = &asoc->peer.primary_addr;
739
740 /* Note: If we go to a common v6 format, this code
741 * will change.
742 */
743
744 /* Map ipv4 address into v4-mapped-on-v6 address. */
745 if (sctp_sk(asoc->base.sk)->v4mapped &&
746 AF_INET == addr->sa.sa_family) {
747 sctp_v4_map_v6((union sctp_addr *)sin6);
748 sin6->sin6_addr.s6_addr32[3] =
749 addr->v4.sin_addr.s_addr;
750 return;
751 }
752
753 sin6from = &asoc->peer.primary_addr.v6;
754 ipv6_addr_copy(&sin6->sin6_addr, &sin6from->sin6_addr);
755 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
756 sin6->sin6_scope_id = sin6from->sin6_scope_id;
757 }
758}
759
760/* Initialize a msg_name from an inbound skb. */
761static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname,
762 int *addr_len)
763{
764 struct sctphdr *sh;
765 struct sockaddr_in6 *sin6;
766
767 if (msgname) {
768 sctp_inet6_msgname(msgname, addr_len);
769 sin6 = (struct sockaddr_in6 *)msgname;
770 sh = (struct sctphdr *)skb->h.raw;
771 sin6->sin6_port = sh->source;
772
773 /* Map ipv4 address into v4-mapped-on-v6 address. */
774 if (sctp_sk(skb->sk)->v4mapped &&
775 skb->nh.iph->version == 4) {
776 sctp_v4_map_v6((union sctp_addr *)sin6);
777 sin6->sin6_addr.s6_addr32[3] = skb->nh.iph->saddr;
778 return;
779 }
780
781 /* Otherwise, just copy the v6 address. */
782 ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr);
783 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) {
784 struct sctp_ulpevent *ev = sctp_skb2event(skb);
785 sin6->sin6_scope_id = ev->iif;
786 }
787 }
788}
789
790/* Do we support this AF? */
791static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp)
792{
793 switch (family) {
794 case AF_INET6:
795 return 1;
796 /* v4-mapped-v6 addresses */
797 case AF_INET:
798 if (!__ipv6_only_sock(sctp_opt2sk(sp)) && sp->v4mapped)
799 return 1;
800 default:
801 return 0;
802 }
803}
804
805/* Address matching with wildcards allowed. This extra level
806 * of indirection lets us choose whether a PF_INET6 should
807 * disallow any v4 addresses if we so choose.
808 */
809static int sctp_inet6_cmp_addr(const union sctp_addr *addr1,
810 const union sctp_addr *addr2,
811 struct sctp_sock *opt)
812{
813 struct sctp_af *af1, *af2;
814
815 af1 = sctp_get_af_specific(addr1->sa.sa_family);
816 af2 = sctp_get_af_specific(addr2->sa.sa_family);
817
818 if (!af1 || !af2)
819 return 0;
820 /* Today, wildcard AF_INET/AF_INET6. */
821 if (sctp_is_any(addr1) || sctp_is_any(addr2))
822 return 1;
823
824 if (addr1->sa.sa_family != addr2->sa.sa_family)
825 return 0;
826
827 return af1->cmp_addr(addr1, addr2);
828}
829
830/* Verify that the provided sockaddr looks bindable. Common verification,
831 * has already been taken care of.
832 */
833static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
834{
835 struct sctp_af *af;
836
837 /* ASSERT: address family has already been verified. */
838 if (addr->sa.sa_family != AF_INET6)
839 af = sctp_get_af_specific(addr->sa.sa_family);
840 else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841 int type = ipv6_addr_type(&addr->v6.sin6_addr);
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700842 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700844 if (type & IPV6_ADDR_LINKLOCAL) {
845 if (!addr->v6.sin6_scope_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846 return 0;
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700847 dev = dev_get_by_index(addr->v6.sin6_scope_id);
848 if (!dev)
849 return 0;
850 dev_put(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851 }
852 af = opt->pf->af;
853 }
854 return af->available(addr, opt);
855}
856
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700857/* Verify that the provided sockaddr looks sendable. Common verification,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858 * has already been taken care of.
859 */
860static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
861{
862 struct sctp_af *af = NULL;
863
864 /* ASSERT: address family has already been verified. */
865 if (addr->sa.sa_family != AF_INET6)
866 af = sctp_get_af_specific(addr->sa.sa_family);
867 else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868 int type = ipv6_addr_type(&addr->v6.sin6_addr);
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700869 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700871 if (type & IPV6_ADDR_LINKLOCAL) {
872 if (!addr->v6.sin6_scope_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873 return 0;
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700874 dev = dev_get_by_index(addr->v6.sin6_scope_id);
875 if (!dev)
876 return 0;
877 dev_put(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878 }
879 af = opt->pf->af;
880 }
881
882 return af != NULL;
883}
884
885/* Fill in Supported Address Type information for INIT and INIT-ACK
886 * chunks. Note: In the future, we may want to look at sock options
887 * to determine whether a PF_INET6 socket really wants to have IPV4
888 * addresses.
889 * Returns number of addresses supported.
890 */
891static int sctp_inet6_supported_addrs(const struct sctp_sock *opt,
Al Viro3dbe8652006-11-20 17:25:49 -0800892 __be16 *types)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893{
894 types[0] = SCTP_PARAM_IPV4_ADDRESS;
895 types[1] = SCTP_PARAM_IPV6_ADDRESS;
896 return 2;
897}
898
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800899static const struct proto_ops inet6_seqpacket_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800900 .family = PF_INET6,
901 .owner = THIS_MODULE,
902 .release = inet6_release,
903 .bind = inet6_bind,
904 .connect = inet_dgram_connect,
905 .socketpair = sock_no_socketpair,
906 .accept = inet_accept,
907 .getname = inet6_getname,
908 .poll = sctp_poll,
909 .ioctl = inet6_ioctl,
910 .listen = sctp_inet_listen,
911 .shutdown = inet_shutdown,
912 .setsockopt = sock_common_setsockopt,
913 .getsockopt = sock_common_getsockopt,
914 .sendmsg = inet_sendmsg,
915 .recvmsg = sock_common_recvmsg,
916 .mmap = sock_no_mmap,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800917#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800918 .compat_setsockopt = compat_sock_common_setsockopt,
919 .compat_getsockopt = compat_sock_common_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800920#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921};
922
923static struct inet_protosw sctpv6_seqpacket_protosw = {
924 .type = SOCK_SEQPACKET,
925 .protocol = IPPROTO_SCTP,
926 .prot = &sctpv6_prot,
927 .ops = &inet6_seqpacket_ops,
928 .capability = -1,
929 .no_check = 0,
930 .flags = SCTP_PROTOSW_FLAG
931};
932static struct inet_protosw sctpv6_stream_protosw = {
933 .type = SOCK_STREAM,
934 .protocol = IPPROTO_SCTP,
935 .prot = &sctpv6_prot,
936 .ops = &inet6_seqpacket_ops,
937 .capability = -1,
938 .no_check = 0,
939 .flags = SCTP_PROTOSW_FLAG,
940};
941
Patrick McHardy951dbc82006-01-06 23:02:34 -0800942static int sctp6_rcv(struct sk_buff **pskb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943{
944 return sctp_rcv(*pskb) ? -1 : 0;
945}
946
947static struct inet6_protocol sctpv6_protocol = {
948 .handler = sctp6_rcv,
949 .err_handler = sctp_v6_err,
950 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
951};
952
953static struct sctp_af sctp_ipv6_specific = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800954 .sa_family = AF_INET6,
955 .sctp_xmit = sctp_v6_xmit,
956 .setsockopt = ipv6_setsockopt,
957 .getsockopt = ipv6_getsockopt,
958 .get_dst = sctp_v6_get_dst,
959 .get_saddr = sctp_v6_get_saddr,
960 .copy_addrlist = sctp_v6_copy_addrlist,
961 .from_skb = sctp_v6_from_skb,
962 .from_sk = sctp_v6_from_sk,
963 .to_sk_saddr = sctp_v6_to_sk_saddr,
964 .to_sk_daddr = sctp_v6_to_sk_daddr,
965 .from_addr_param = sctp_v6_from_addr_param,
966 .to_addr_param = sctp_v6_to_addr_param,
967 .dst_saddr = sctp_v6_dst_saddr,
968 .cmp_addr = sctp_v6_cmp_addr,
969 .scope = sctp_v6_scope,
970 .addr_valid = sctp_v6_addr_valid,
971 .inaddr_any = sctp_v6_inaddr_any,
972 .is_any = sctp_v6_is_any,
973 .available = sctp_v6_available,
974 .skb_iif = sctp_v6_skb_iif,
975 .is_ce = sctp_v6_is_ce,
976 .seq_dump_addr = sctp_v6_seq_dump_addr,
977 .net_header_len = sizeof(struct ipv6hdr),
978 .sockaddr_len = sizeof(struct sockaddr_in6),
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800979#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800980 .compat_setsockopt = compat_ipv6_setsockopt,
981 .compat_getsockopt = compat_ipv6_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800982#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983};
984
985static struct sctp_pf sctp_pf_inet6_specific = {
986 .event_msgname = sctp_inet6_event_msgname,
987 .skb_msgname = sctp_inet6_skb_msgname,
988 .af_supported = sctp_inet6_af_supported,
989 .cmp_addr = sctp_inet6_cmp_addr,
990 .bind_verify = sctp_inet6_bind_verify,
991 .send_verify = sctp_inet6_send_verify,
992 .supported_addrs = sctp_inet6_supported_addrs,
993 .create_accept_sk = sctp_v6_create_accept_sk,
994 .addr_v4map = sctp_v6_addr_v4map,
995 .af = &sctp_ipv6_specific,
996};
997
998/* Initialize IPv6 support and register with inet6 stack. */
999int sctp_v6_init(void)
1000{
1001 int rc = proto_register(&sctpv6_prot, 1);
1002
1003 if (rc)
1004 goto out;
1005 /* Register inet6 protocol. */
1006 rc = -EAGAIN;
1007 if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0)
1008 goto out_unregister_sctp_proto;
1009
1010 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
1011 inet6_register_protosw(&sctpv6_seqpacket_protosw);
1012 inet6_register_protosw(&sctpv6_stream_protosw);
1013
1014 /* Register the SCTP specific PF_INET6 functions. */
1015 sctp_register_pf(&sctp_pf_inet6_specific, PF_INET6);
1016
1017 /* Register the SCTP specific AF_INET6 functions. */
1018 sctp_register_af(&sctp_ipv6_specific);
1019
1020 /* Register notifier for inet6 address additions/deletions. */
1021 register_inet6addr_notifier(&sctp_inet6addr_notifier);
1022 rc = 0;
1023out:
1024 return rc;
1025out_unregister_sctp_proto:
1026 proto_unregister(&sctpv6_prot);
1027 goto out;
1028}
1029
1030/* IPv6 specific exit support. */
1031void sctp_v6_exit(void)
1032{
1033 list_del(&sctp_ipv6_specific.list);
1034 inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP);
1035 inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
1036 inet6_unregister_protosw(&sctpv6_stream_protosw);
1037 unregister_inet6addr_notifier(&sctp_inet6addr_notifier);
1038 proto_unregister(&sctpv6_prot);
1039}