blob: c78da3c9dd347ed16952d4ba98eb1341574dff7d [file] [log] [blame]
Vlad Yasevich60c778b2008-01-11 09:57:09 -05001/* SCTP kernel implementation
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * (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 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -05007 * This file is part of the SCTP kernel implementation
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 *
9 * SCTP over IPv6.
10 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -050011 * This SCTP implementation is free software;
Linus Torvalds1da177e2005-04-16 15:20:36 -070012 * 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 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -050017 * This SCTP implementation is distributed in the hope that it
Linus Torvalds1da177e2005-04-16 15:20:36 -070018 * 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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070056#include <linux/in.h>
57#include <linux/in6.h>
58#include <linux/netdevice.h>
59#include <linux/init.h>
60#include <linux/ipsec.h>
61
62#include <linux/ipv6.h>
63#include <linux/icmpv6.h>
64#include <linux/random.h>
65#include <linux/seq_file.h>
66
67#include <net/protocol.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070068#include <net/ndisc.h>
Arnaldo Carvalho de Meloc752f072005-08-09 20:08:28 -070069#include <net/ip.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070070#include <net/ipv6.h>
71#include <net/transp_v6.h>
72#include <net/addrconf.h>
73#include <net/ip6_route.h>
74#include <net/inet_common.h>
75#include <net/inet_ecn.h>
76#include <net/sctp/sctp.h>
77
78#include <asm/uaccess.h>
79
Vlad Yasevich29303542007-09-16 16:02:12 -070080/* Event handler for inet6 address addition/deletion events.
81 * The sctp_local_addr_list needs to be protocted by a spin lock since
82 * multiple notifiers (say IPv4 and IPv6) may be running at the same
83 * time and thus corrupt the list.
84 * The reader side is protected with RCU.
85 */
Adrian Bunk24123182006-12-20 16:08:22 -080086static int sctp_inet6addr_event(struct notifier_block *this, unsigned long ev,
87 void *ptr)
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -080088{
89 struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
Vlad Yasevich29303542007-09-16 16:02:12 -070090 struct sctp_sockaddr_entry *addr = NULL;
91 struct sctp_sockaddr_entry *temp;
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -070092 int found = 0;
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -080093
94 switch (ev) {
95 case NETDEV_UP:
96 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
97 if (addr) {
98 addr->a.v6.sin6_family = AF_INET6;
99 addr->a.v6.sin6_port = 0;
100 memcpy(&addr->a.v6.sin6_addr, &ifa->addr,
101 sizeof(struct in6_addr));
102 addr->a.v6.sin6_scope_id = ifa->idev->dev->ifindex;
Vlad Yasevich29303542007-09-16 16:02:12 -0700103 addr->valid = 1;
104 spin_lock_bh(&sctp_local_addr_lock);
105 list_add_tail_rcu(&addr->list, &sctp_local_addr_list);
106 spin_unlock_bh(&sctp_local_addr_lock);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800107 }
108 break;
109 case NETDEV_DOWN:
Vlad Yasevich29303542007-09-16 16:02:12 -0700110 spin_lock_bh(&sctp_local_addr_lock);
111 list_for_each_entry_safe(addr, temp,
112 &sctp_local_addr_list, list) {
Pavel Emelyanova40a7d12008-04-12 18:40:38 -0700113 if (addr->a.sa.sa_family == AF_INET6 &&
114 ipv6_addr_equal(&addr->a.v6.sin6_addr,
115 &ifa->addr)) {
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -0700116 found = 1;
Vlad Yasevich29303542007-09-16 16:02:12 -0700117 addr->valid = 0;
118 list_del_rcu(&addr->list);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800119 break;
120 }
121 }
Vlad Yasevich29303542007-09-16 16:02:12 -0700122 spin_unlock_bh(&sctp_local_addr_lock);
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -0700123 if (found)
Vlad Yasevich29303542007-09-16 16:02:12 -0700124 call_rcu(&addr->rcu, sctp_local_addr_free);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800125 break;
126 }
127
128 return NOTIFY_DONE;
129}
130
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131static struct notifier_block sctp_inet6addr_notifier = {
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800132 .notifier_call = sctp_inet6addr_event,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133};
134
135/* ICMP error handler. */
136SCTP_STATIC void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Al Viro04ce6902006-11-08 00:21:01 -0800137 int type, int code, int offset, __be32 info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138{
139 struct inet6_dev *idev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 struct sock *sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 struct sctp_association *asoc;
142 struct sctp_transport *transport;
143 struct ipv6_pinfo *np;
Arnaldo Carvalho de Melo2e07fa92007-04-10 21:22:35 -0700144 sk_buff_data_t saveip, savesctp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 int err;
146
147 idev = in6_dev_get(skb->dev);
148
149 /* Fix up skb to look at the embedded net header. */
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700150 saveip = skb->network_header;
151 savesctp = skb->transport_header;
Arnaldo Carvalho de Melo1ced98e2007-03-10 19:57:15 -0300152 skb_reset_network_header(skb);
Arnaldo Carvalho de Meloa27ef742007-03-13 17:17:10 -0300153 skb_set_transport_header(skb, offset);
154 sk = sctp_err_lookup(AF_INET6, skb, sctp_hdr(skb), &asoc, &transport);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 /* Put back, the original pointers. */
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700156 skb->network_header = saveip;
157 skb->transport_header = savesctp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 if (!sk) {
159 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INERRORS);
160 goto out;
161 }
162
163 /* Warning: The sock lock is held. Remember to call
164 * sctp_err_finish!
165 */
166
167 switch (type) {
168 case ICMPV6_PKT_TOOBIG:
169 sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info));
170 goto out_unlock;
171 case ICMPV6_PARAMPROB:
172 if (ICMPV6_UNK_NEXTHDR == code) {
Sridhar Samudralad1ad1ff2005-07-18 13:44:10 -0700173 sctp_icmp_proto_unreachable(sk, asoc, transport);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 goto out_unlock;
175 }
176 break;
177 default:
178 break;
179 }
180
181 np = inet6_sk(sk);
182 icmpv6_err_convert(type, code, &err);
183 if (!sock_owned_by_user(sk) && np->recverr) {
184 sk->sk_err = err;
185 sk->sk_error_report(sk);
186 } else { /* Only an error on timeout */
187 sk->sk_err_soft = err;
188 }
189
190out_unlock:
Sridhar Samudralad1ad1ff2005-07-18 13:44:10 -0700191 sctp_err_finish(sk, asoc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192out:
193 if (likely(idev != NULL))
194 in6_dev_put(idev);
195}
196
197/* Based on tcp_v6_xmit() in tcp_ipv6.c. */
Herbert Xuf8803742008-08-03 21:15:08 -0700198static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199{
200 struct sock *sk = skb->sk;
201 struct ipv6_pinfo *np = inet6_sk(sk);
202 struct flowi fl;
203
204 memset(&fl, 0, sizeof(fl));
205
206 fl.proto = sk->sk_protocol;
207
208 /* Fill in the dest address from the route entry passed with the skb
209 * and the source address from the transport.
210 */
Al Virob3f5b3b2006-11-20 17:22:43 -0800211 ipv6_addr_copy(&fl.fl6_dst, &transport->ipaddr.v6.sin6_addr);
Al Viroa9266262006-11-20 17:13:58 -0800212 ipv6_addr_copy(&fl.fl6_src, &transport->saddr.v6.sin6_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213
214 fl.fl6_flowlabel = np->flow_label;
215 IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel);
216 if (ipv6_addr_type(&fl.fl6_src) & IPV6_ADDR_LINKLOCAL)
Al Viroa9266262006-11-20 17:13:58 -0800217 fl.oif = transport->saddr.v6.sin6_scope_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 else
219 fl.oif = sk->sk_bound_dev_if;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220
221 if (np->opt && np->opt->srcrt) {
222 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
223 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
224 }
225
226 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, "
Joe Perches46b86a22006-01-13 14:29:07 -0800227 "src:" NIP6_FMT " dst:" NIP6_FMT "\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800228 __func__, skb, skb->len,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 NIP6(fl.fl6_src), NIP6(fl.fl6_dst));
230
231 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
232
Herbert Xuf8803742008-08-03 21:15:08 -0700233 if (!(transport->param_flags & SPP_PMTUD_ENABLE))
234 skb->local_df = 1;
235
236 return ip6_xmit(sk, skb, &fl, np->opt, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237}
238
239/* Returns the dst cache entry for the given source and destination ip
240 * addresses.
241 */
242static struct dst_entry *sctp_v6_get_dst(struct sctp_association *asoc,
243 union sctp_addr *daddr,
244 union sctp_addr *saddr)
245{
246 struct dst_entry *dst;
247 struct flowi fl;
248
249 memset(&fl, 0, sizeof(fl));
250 ipv6_addr_copy(&fl.fl6_dst, &daddr->v6.sin6_addr);
251 if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
252 fl.oif = daddr->v6.sin6_scope_id;
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900253
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254
Joe Perches46b86a22006-01-13 14:29:07 -0800255 SCTP_DEBUG_PRINTK("%s: DST=" NIP6_FMT " ",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800256 __func__, NIP6(fl.fl6_dst));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257
258 if (saddr) {
259 ipv6_addr_copy(&fl.fl6_src, &saddr->v6.sin6_addr);
260 SCTP_DEBUG_PRINTK(
Joe Perches46b86a22006-01-13 14:29:07 -0800261 "SRC=" NIP6_FMT " - ",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 NIP6(fl.fl6_src));
263 }
264
Daniel Lezcano4591db42008-03-05 10:48:10 -0800265 dst = ip6_route_output(&init_net, NULL, &fl);
Ville Nuorvala42513202006-10-16 22:10:05 -0700266 if (!dst->error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 struct rt6_info *rt;
268 rt = (struct rt6_info *)dst;
269 SCTP_DEBUG_PRINTK(
Joe Perches46b86a22006-01-13 14:29:07 -0800270 "rt6_dst:" NIP6_FMT " rt6_src:" NIP6_FMT "\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 NIP6(rt->rt6i_dst.addr), NIP6(rt->rt6i_src.addr));
Ville Nuorvala42513202006-10-16 22:10:05 -0700272 return dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 }
Ville Nuorvala42513202006-10-16 22:10:05 -0700274 SCTP_DEBUG_PRINTK("NO ROUTE\n");
275 dst_release(dst);
276 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277}
278
279/* Returns the number of consecutive initial bits that match in the 2 ipv6
280 * addresses.
281 */
282static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
283 union sctp_addr *s2)
284{
285 struct in6_addr *a1 = &s1->v6.sin6_addr;
286 struct in6_addr *a2 = &s2->v6.sin6_addr;
287 int i, j;
288
289 for (i = 0; i < 4 ; i++) {
Al Virodbc16db2006-11-20 17:01:42 -0800290 __be32 a1xora2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291
292 a1xora2 = a1->s6_addr32[i] ^ a2->s6_addr32[i];
293
294 if ((j = fls(ntohl(a1xora2))))
295 return (i * 32 + 32 - j);
296 }
297
298 return (i*32);
299}
300
301/* Fills in the source address(saddr) based on the destination address(daddr)
302 * and asoc's bind address list.
303 */
YOSHIFUJI Hideakie5117102008-05-29 19:55:05 +0900304static void sctp_v6_get_saddr(struct sctp_sock *sk,
305 struct sctp_association *asoc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 struct dst_entry *dst,
307 union sctp_addr *daddr,
308 union sctp_addr *saddr)
309{
310 struct sctp_bind_addr *bp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 struct sctp_sockaddr_entry *laddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 sctp_scope_t scope;
313 union sctp_addr *baddr = NULL;
314 __u8 matchlen = 0;
315 __u8 bmatchlen;
316
317 SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p "
Joe Perches46b86a22006-01-13 14:29:07 -0800318 "daddr:" NIP6_FMT " ",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800319 __func__, asoc, dst, NIP6(daddr->v6.sin6_addr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320
321 if (!asoc) {
Brian Haley191cd582008-08-14 15:33:21 -0700322 ipv6_dev_get_saddr(sock_net(sctp_opt2sk(sk)),
323 dst ? ip6_dst_idev(dst)->dev : NULL,
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +0900324 &daddr->v6.sin6_addr,
YOSHIFUJI Hideakie5117102008-05-29 19:55:05 +0900325 inet6_sk(&sk->inet.sk)->srcprefs,
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +0900326 &saddr->v6.sin6_addr);
Joe Perches46b86a22006-01-13 14:29:07 -0800327 SCTP_DEBUG_PRINTK("saddr from ipv6_get_saddr: " NIP6_FMT "\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 NIP6(saddr->v6.sin6_addr));
329 return;
330 }
331
332 scope = sctp_scope(daddr);
333
334 bp = &asoc->base.bind_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335
336 /* Go through the bind address list and find the best source address
337 * that matches the scope of the destination address.
338 */
Vlad Yasevich559cf712007-09-16 16:03:28 -0700339 rcu_read_lock();
340 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
341 if (!laddr->valid)
342 continue;
Vlad Yasevichf57d96b2007-12-20 14:12:24 -0800343 if ((laddr->state == SCTP_ADDR_SRC) &&
Al Viro6244be42006-11-20 17:21:44 -0800344 (laddr->a.sa.sa_family == AF_INET6) &&
345 (scope <= sctp_scope(&laddr->a))) {
Al Virod3f7a542006-11-20 17:12:41 -0800346 bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 if (!baddr || (matchlen < bmatchlen)) {
Al Virod3f7a542006-11-20 17:12:41 -0800348 baddr = &laddr->a;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 matchlen = bmatchlen;
350 }
351 }
352 }
353
354 if (baddr) {
355 memcpy(saddr, baddr, sizeof(union sctp_addr));
Joe Perches46b86a22006-01-13 14:29:07 -0800356 SCTP_DEBUG_PRINTK("saddr: " NIP6_FMT "\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 NIP6(saddr->v6.sin6_addr));
358 } else {
359 printk(KERN_ERR "%s: asoc:%p Could not find a valid source "
Joe Perches46b86a22006-01-13 14:29:07 -0800360 "address for the dest:" NIP6_FMT "\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800361 __func__, asoc, NIP6(daddr->v6.sin6_addr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 }
363
Vlad Yasevich559cf712007-09-16 16:03:28 -0700364 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365}
366
367/* Make a copy of all potential local addresses. */
368static void sctp_v6_copy_addrlist(struct list_head *addrlist,
369 struct net_device *dev)
370{
371 struct inet6_dev *in6_dev;
372 struct inet6_ifaddr *ifp;
373 struct sctp_sockaddr_entry *addr;
374
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -0700375 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 if ((in6_dev = __in6_dev_get(dev)) == NULL) {
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -0700377 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 return;
379 }
380
Jarek Poplawskie2eb8d42007-03-08 14:43:41 -0800381 read_lock_bh(&in6_dev->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 for (ifp = in6_dev->addr_list; ifp; ifp = ifp->if_next) {
383 /* Add the address to the local list. */
384 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
385 if (addr) {
Al Viro2a6fd782006-11-20 17:04:42 -0800386 addr->a.v6.sin6_family = AF_INET6;
387 addr->a.v6.sin6_port = 0;
388 addr->a.v6.sin6_addr = ifp->addr;
389 addr->a.v6.sin6_scope_id = dev->ifindex;
Vlad Yasevich29303542007-09-16 16:02:12 -0700390 addr->valid = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 INIT_LIST_HEAD(&addr->list);
Vlad Yasevich29303542007-09-16 16:02:12 -0700392 INIT_RCU_HEAD(&addr->rcu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 list_add_tail(&addr->list, addrlist);
394 }
395 }
396
Jarek Poplawskie2eb8d42007-03-08 14:43:41 -0800397 read_unlock_bh(&in6_dev->lock);
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -0700398 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399}
400
401/* Initialize a sockaddr_storage from in incoming skb. */
402static void sctp_v6_from_skb(union sctp_addr *addr,struct sk_buff *skb,
403 int is_saddr)
404{
405 void *from;
Al Virod55c41b2006-11-20 17:09:40 -0800406 __be16 *port;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 struct sctphdr *sh;
408
409 port = &addr->v6.sin6_port;
410 addr->v6.sin6_family = AF_INET6;
411 addr->v6.sin6_flowinfo = 0; /* FIXME */
412 addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif;
413
Arnaldo Carvalho de Melo2c0fd382007-03-13 13:59:32 -0300414 sh = sctp_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 if (is_saddr) {
Al Virod55c41b2006-11-20 17:09:40 -0800416 *port = sh->source;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700417 from = &ipv6_hdr(skb)->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 } else {
Al Virod55c41b2006-11-20 17:09:40 -0800419 *port = sh->dest;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700420 from = &ipv6_hdr(skb)->daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 }
422 ipv6_addr_copy(&addr->v6.sin6_addr, from);
423}
424
425/* Initialize an sctp_addr from a socket. */
426static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk)
427{
428 addr->v6.sin6_family = AF_INET6;
Al Viro7dcdbd92006-11-20 17:24:21 -0800429 addr->v6.sin6_port = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 addr->v6.sin6_addr = inet6_sk(sk)->rcv_saddr;
431}
432
433/* Initialize sk->sk_rcv_saddr from sctp_addr. */
434static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
435{
436 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
437 inet6_sk(sk)->rcv_saddr.s6_addr32[0] = 0;
438 inet6_sk(sk)->rcv_saddr.s6_addr32[1] = 0;
439 inet6_sk(sk)->rcv_saddr.s6_addr32[2] = htonl(0x0000ffff);
440 inet6_sk(sk)->rcv_saddr.s6_addr32[3] =
441 addr->v4.sin_addr.s_addr;
442 } else {
443 inet6_sk(sk)->rcv_saddr = addr->v6.sin6_addr;
444 }
445}
446
447/* Initialize sk->sk_daddr from sctp_addr. */
448static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
449{
450 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
451 inet6_sk(sk)->daddr.s6_addr32[0] = 0;
452 inet6_sk(sk)->daddr.s6_addr32[1] = 0;
453 inet6_sk(sk)->daddr.s6_addr32[2] = htonl(0x0000ffff);
454 inet6_sk(sk)->daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
455 } else {
456 inet6_sk(sk)->daddr = addr->v6.sin6_addr;
457 }
458}
459
460/* Initialize a sctp_addr from an address parameter. */
461static void sctp_v6_from_addr_param(union sctp_addr *addr,
462 union sctp_addr_param *param,
Al Virodd86d132006-11-20 17:11:13 -0800463 __be16 port, int iif)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464{
465 addr->v6.sin6_family = AF_INET6;
466 addr->v6.sin6_port = port;
467 addr->v6.sin6_flowinfo = 0; /* BUG */
468 ipv6_addr_copy(&addr->v6.sin6_addr, &param->v6.addr);
469 addr->v6.sin6_scope_id = iif;
470}
471
472/* Initialize an address parameter from a sctp_addr and return the length
473 * of the address parameter.
474 */
475static int sctp_v6_to_addr_param(const union sctp_addr *addr,
476 union sctp_addr_param *param)
477{
478 int length = sizeof(sctp_ipv6addr_param_t);
479
480 param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS;
Al Virodbc16db2006-11-20 17:01:42 -0800481 param->v6.param_hdr.length = htons(length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 ipv6_addr_copy(&param->v6.addr, &addr->v6.sin6_addr);
483
484 return length;
485}
486
487/* Initialize a sctp_addr from a dst_entry. */
488static void sctp_v6_dst_saddr(union sctp_addr *addr, struct dst_entry *dst,
Al Viro854d43a2006-11-20 17:06:24 -0800489 __be16 port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490{
491 struct rt6_info *rt = (struct rt6_info *)dst;
492 addr->sa.sa_family = AF_INET6;
493 addr->v6.sin6_port = port;
494 ipv6_addr_copy(&addr->v6.sin6_addr, &rt->rt6i_src.addr);
495}
496
497/* Compare addresses exactly.
498 * v4-mapped-v6 is also in consideration.
499 */
500static 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 &&
Brian Haleye773e4f2007-08-24 23:16:08 -0700506 ipv6_addr_v4mapped(&addr2->v6.sin6_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 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 &&
Brian Haleye773e4f2007-08-24 23:16:08 -0700514 ipv6_addr_v4mapped(&addr1->v6.sin6_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 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. */
Al Viro6fbfa9f2006-11-20 17:24:53 -0800536static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537{
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? */
544static int sctp_v6_is_any(const union sctp_addr *addr)
545{
Brian Haleyb9b9e102005-04-28 11:59:16 -0700546 return ipv6_addr_any(&addr->v6.sin6_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547}
548
549/* Should this be available for binding? */
550static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp)
551{
552 int type;
553 struct in6_addr *in6 = (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
Daniel Lezcanobfeade02008-01-10 22:43:18 -0800569 return ipv6_chk_addr(&init_net, in6, NULL, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570}
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 */
Vlad Yasevich5636bef2006-06-17 22:55:35 -0700579static int sctp_v6_addr_valid(union sctp_addr *addr,
580 struct sctp_sock *sp,
581 const struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582{
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);
Vlad Yasevich5636bef2006-06-17 22:55:35 -0700595 return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596 }
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'? */
606static 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;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700629 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630
631 return retval;
632}
633
634/* Create and initialize a new sk for the socket to be returned by accept(). */
635static struct sock *sctp_v6_create_accept_sk(struct sock *sk,
636 struct sctp_association *asoc)
637{
638 struct inet_sock *inet = inet_sk(sk);
639 struct sock *newsk;
640 struct inet_sock *newinet;
641 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
642 struct sctp6_sock *newsctp6sk;
643
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900644 newsk = sk_alloc(sock_net(sk), PF_INET6, GFP_KERNEL, sk->sk_prot);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645 if (!newsk)
646 goto out;
647
648 sock_init_data(NULL, newsk);
649
650 newsk->sk_type = SOCK_STREAM;
651
652 newsk->sk_prot = sk->sk_prot;
653 newsk->sk_no_check = sk->sk_no_check;
654 newsk->sk_reuse = sk->sk_reuse;
655
656 newsk->sk_destruct = inet_sock_destruct;
657 newsk->sk_family = PF_INET6;
658 newsk->sk_protocol = IPPROTO_SCTP;
659 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
660 newsk->sk_shutdown = sk->sk_shutdown;
661 sock_reset_flag(sk, SOCK_ZAPPED);
662
663 newsctp6sk = (struct sctp6_sock *)newsk;
664 inet_sk(newsk)->pinet6 = &newsctp6sk->inet6;
665
Dave Johnsonb225b882007-07-25 19:49:29 -0400666 sctp_sk(newsk)->v4mapped = sctp_sk(sk)->v4mapped;
667
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668 newinet = inet_sk(newsk);
669 newnp = inet6_sk(newsk);
670
671 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
672
673 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
674 * and getpeername().
675 */
676 newinet->sport = inet->sport;
677 newnp->saddr = np->saddr;
678 newnp->rcv_saddr = np->rcv_saddr;
679 newinet->dport = htons(asoc->peer.port);
680 sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);
681
682 /* Init the ipv4 part of the socket since we can have sockets
683 * using v6 API for ipv4.
684 */
685 newinet->uc_ttl = -1;
686 newinet->mc_loop = 1;
687 newinet->mc_ttl = 1;
688 newinet->mc_index = 0;
689 newinet->mc_list = NULL;
690
691 if (ipv4_config.no_pmtu_disc)
692 newinet->pmtudisc = IP_PMTUDISC_DONT;
693 else
694 newinet->pmtudisc = IP_PMTUDISC_WANT;
695
Arnaldo Carvalho de Meloe6848972005-08-09 19:45:38 -0700696 sk_refcnt_debug_inc(newsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697
698 if (newsk->sk_prot->init(newsk)) {
699 sk_common_release(newsk);
700 newsk = NULL;
701 }
702
703out:
704 return newsk;
705}
706
707/* Map v4 address to mapped v6 address */
708static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
709{
710 if (sp->v4mapped && AF_INET == addr->sa.sa_family)
711 sctp_v4_map_v6(addr);
712}
713
714/* Where did this skb come from? */
715static int sctp_v6_skb_iif(const struct sk_buff *skb)
716{
717 struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
718 return opt->iif;
719}
720
721/* Was this packet marked by Explicit Congestion Notification? */
722static int sctp_v6_is_ce(const struct sk_buff *skb)
723{
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700724 return *((__u32 *)(ipv6_hdr(skb))) & htonl(1 << 20);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725}
726
727/* Dump the v6 addr to the seq file. */
728static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
729{
Joe Perches46b86a22006-01-13 14:29:07 -0800730 seq_printf(seq, NIP6_FMT " ", NIP6(addr->v6.sin6_addr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731}
732
Vlad Yasevichb9031d92008-06-04 12:40:15 -0700733static void sctp_v6_ecn_capable(struct sock *sk)
734{
735 inet6_sk(sk)->tclass |= INET_ECN_ECT_0;
736}
737
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738/* Initialize a PF_INET6 socket msg_name. */
739static void sctp_inet6_msgname(char *msgname, int *addr_len)
740{
741 struct sockaddr_in6 *sin6;
742
743 sin6 = (struct sockaddr_in6 *)msgname;
744 sin6->sin6_family = AF_INET6;
745 sin6->sin6_flowinfo = 0;
746 sin6->sin6_scope_id = 0; /*FIXME */
747 *addr_len = sizeof(struct sockaddr_in6);
748}
749
750/* Initialize a PF_INET msgname from a ulpevent. */
751static void sctp_inet6_event_msgname(struct sctp_ulpevent *event,
752 char *msgname, int *addrlen)
753{
754 struct sockaddr_in6 *sin6, *sin6from;
755
756 if (msgname) {
757 union sctp_addr *addr;
758 struct sctp_association *asoc;
759
760 asoc = event->asoc;
761 sctp_inet6_msgname(msgname, addrlen);
762 sin6 = (struct sockaddr_in6 *)msgname;
763 sin6->sin6_port = htons(asoc->peer.port);
764 addr = &asoc->peer.primary_addr;
765
766 /* Note: If we go to a common v6 format, this code
767 * will change.
768 */
769
770 /* Map ipv4 address into v4-mapped-on-v6 address. */
771 if (sctp_sk(asoc->base.sk)->v4mapped &&
772 AF_INET == addr->sa.sa_family) {
773 sctp_v4_map_v6((union sctp_addr *)sin6);
774 sin6->sin6_addr.s6_addr32[3] =
775 addr->v4.sin_addr.s_addr;
776 return;
777 }
778
779 sin6from = &asoc->peer.primary_addr.v6;
780 ipv6_addr_copy(&sin6->sin6_addr, &sin6from->sin6_addr);
781 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
782 sin6->sin6_scope_id = sin6from->sin6_scope_id;
783 }
784}
785
786/* Initialize a msg_name from an inbound skb. */
787static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname,
788 int *addr_len)
789{
790 struct sctphdr *sh;
791 struct sockaddr_in6 *sin6;
792
793 if (msgname) {
794 sctp_inet6_msgname(msgname, addr_len);
795 sin6 = (struct sockaddr_in6 *)msgname;
Arnaldo Carvalho de Melo2c0fd382007-03-13 13:59:32 -0300796 sh = sctp_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797 sin6->sin6_port = sh->source;
798
799 /* Map ipv4 address into v4-mapped-on-v6 address. */
800 if (sctp_sk(skb->sk)->v4mapped &&
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700801 ip_hdr(skb)->version == 4) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802 sctp_v4_map_v6((union sctp_addr *)sin6);
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700803 sin6->sin6_addr.s6_addr32[3] = ip_hdr(skb)->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804 return;
805 }
806
807 /* Otherwise, just copy the v6 address. */
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700808 ipv6_addr_copy(&sin6->sin6_addr, &ipv6_hdr(skb)->saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) {
810 struct sctp_ulpevent *ev = sctp_skb2event(skb);
811 sin6->sin6_scope_id = ev->iif;
812 }
813 }
814}
815
816/* Do we support this AF? */
817static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp)
818{
819 switch (family) {
820 case AF_INET6:
821 return 1;
822 /* v4-mapped-v6 addresses */
823 case AF_INET:
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700824 if (!__ipv6_only_sock(sctp_opt2sk(sp)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825 return 1;
826 default:
827 return 0;
828 }
829}
830
831/* Address matching with wildcards allowed. This extra level
832 * of indirection lets us choose whether a PF_INET6 should
833 * disallow any v4 addresses if we so choose.
834 */
835static int sctp_inet6_cmp_addr(const union sctp_addr *addr1,
836 const union sctp_addr *addr2,
837 struct sctp_sock *opt)
838{
839 struct sctp_af *af1, *af2;
Vlad Yasevich52cae8f2008-08-18 10:34:34 -0400840 struct sock *sk = sctp_opt2sk(opt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841
842 af1 = sctp_get_af_specific(addr1->sa.sa_family);
843 af2 = sctp_get_af_specific(addr2->sa.sa_family);
844
845 if (!af1 || !af2)
846 return 0;
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700847
848 /* If the socket is IPv6 only, v4 addrs will not match */
Vlad Yasevich52cae8f2008-08-18 10:34:34 -0400849 if (__ipv6_only_sock(sk) && af1 != af2)
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700850 return 0;
851
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852 /* Today, wildcard AF_INET/AF_INET6. */
Vlad Yasevich52cae8f2008-08-18 10:34:34 -0400853 if (sctp_is_any(sk, addr1) || sctp_is_any(sk, addr2))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854 return 1;
855
856 if (addr1->sa.sa_family != addr2->sa.sa_family)
857 return 0;
858
859 return af1->cmp_addr(addr1, addr2);
860}
861
862/* Verify that the provided sockaddr looks bindable. Common verification,
863 * has already been taken care of.
864 */
865static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
866{
867 struct sctp_af *af;
868
869 /* ASSERT: address family has already been verified. */
870 if (addr->sa.sa_family != AF_INET6)
871 af = sctp_get_af_specific(addr->sa.sa_family);
872 else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873 int type = ipv6_addr_type(&addr->v6.sin6_addr);
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700874 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700876 if (type & IPV6_ADDR_LINKLOCAL) {
877 if (!addr->v6.sin6_scope_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878 return 0;
Eric W. Biederman881d9662007-09-17 11:56:21 -0700879 dev = dev_get_by_index(&init_net, addr->v6.sin6_scope_id);
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700880 if (!dev)
881 return 0;
Daniel Lezcanobfeade02008-01-10 22:43:18 -0800882 if (!ipv6_chk_addr(&init_net, &addr->v6.sin6_addr,
883 dev, 0)) {
Vlad Yasevich1669d852007-07-03 14:29:23 -0400884 dev_put(dev);
885 return 0;
886 }
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700887 dev_put(dev);
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700888 } else if (type == IPV6_ADDR_MAPPED) {
889 if (!opt->v4mapped)
890 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891 }
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700892
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893 af = opt->pf->af;
894 }
895 return af->available(addr, opt);
896}
897
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700898/* Verify that the provided sockaddr looks sendable. Common verification,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899 * has already been taken care of.
900 */
901static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
902{
903 struct sctp_af *af = NULL;
904
905 /* ASSERT: address family has already been verified. */
906 if (addr->sa.sa_family != AF_INET6)
907 af = sctp_get_af_specific(addr->sa.sa_family);
908 else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909 int type = ipv6_addr_type(&addr->v6.sin6_addr);
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700910 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700912 if (type & IPV6_ADDR_LINKLOCAL) {
913 if (!addr->v6.sin6_scope_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914 return 0;
Eric W. Biederman881d9662007-09-17 11:56:21 -0700915 dev = dev_get_by_index(&init_net, addr->v6.sin6_scope_id);
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700916 if (!dev)
917 return 0;
918 dev_put(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919 }
920 af = opt->pf->af;
921 }
922
923 return af != NULL;
924}
925
926/* Fill in Supported Address Type information for INIT and INIT-ACK
927 * chunks. Note: In the future, we may want to look at sock options
928 * to determine whether a PF_INET6 socket really wants to have IPV4
929 * addresses.
930 * Returns number of addresses supported.
931 */
932static int sctp_inet6_supported_addrs(const struct sctp_sock *opt,
Al Viro3dbe8652006-11-20 17:25:49 -0800933 __be16 *types)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934{
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700935 types[0] = SCTP_PARAM_IPV6_ADDRESS;
936 if (!opt || !ipv6_only_sock(sctp_opt2sk(opt))) {
937 types[1] = SCTP_PARAM_IPV4_ADDRESS;
938 return 2;
939 }
940 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941}
942
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800943static const struct proto_ops inet6_seqpacket_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800944 .family = PF_INET6,
945 .owner = THIS_MODULE,
946 .release = inet6_release,
947 .bind = inet6_bind,
948 .connect = inet_dgram_connect,
949 .socketpair = sock_no_socketpair,
950 .accept = inet_accept,
951 .getname = inet6_getname,
952 .poll = sctp_poll,
953 .ioctl = inet6_ioctl,
954 .listen = sctp_inet_listen,
955 .shutdown = inet_shutdown,
956 .setsockopt = sock_common_setsockopt,
957 .getsockopt = sock_common_getsockopt,
958 .sendmsg = inet_sendmsg,
959 .recvmsg = sock_common_recvmsg,
960 .mmap = sock_no_mmap,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800961#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800962 .compat_setsockopt = compat_sock_common_setsockopt,
963 .compat_getsockopt = compat_sock_common_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800964#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965};
966
967static struct inet_protosw sctpv6_seqpacket_protosw = {
968 .type = SOCK_SEQPACKET,
969 .protocol = IPPROTO_SCTP,
970 .prot = &sctpv6_prot,
971 .ops = &inet6_seqpacket_ops,
972 .capability = -1,
973 .no_check = 0,
974 .flags = SCTP_PROTOSW_FLAG
975};
976static struct inet_protosw sctpv6_stream_protosw = {
977 .type = SOCK_STREAM,
978 .protocol = IPPROTO_SCTP,
979 .prot = &sctpv6_prot,
980 .ops = &inet6_seqpacket_ops,
981 .capability = -1,
982 .no_check = 0,
983 .flags = SCTP_PROTOSW_FLAG,
984};
985
Herbert Xue5bbef22007-10-15 12:50:28 -0700986static int sctp6_rcv(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987{
Herbert Xue5bbef22007-10-15 12:50:28 -0700988 return sctp_rcv(skb) ? -1 : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989}
990
991static struct inet6_protocol sctpv6_protocol = {
992 .handler = sctp6_rcv,
993 .err_handler = sctp_v6_err,
994 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
995};
996
Neil Horman15efbe72008-02-15 09:53:59 -0500997static struct sctp_af sctp_af_inet6 = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800998 .sa_family = AF_INET6,
999 .sctp_xmit = sctp_v6_xmit,
1000 .setsockopt = ipv6_setsockopt,
1001 .getsockopt = ipv6_getsockopt,
1002 .get_dst = sctp_v6_get_dst,
1003 .get_saddr = sctp_v6_get_saddr,
1004 .copy_addrlist = sctp_v6_copy_addrlist,
1005 .from_skb = sctp_v6_from_skb,
1006 .from_sk = sctp_v6_from_sk,
1007 .to_sk_saddr = sctp_v6_to_sk_saddr,
1008 .to_sk_daddr = sctp_v6_to_sk_daddr,
1009 .from_addr_param = sctp_v6_from_addr_param,
1010 .to_addr_param = sctp_v6_to_addr_param,
1011 .dst_saddr = sctp_v6_dst_saddr,
1012 .cmp_addr = sctp_v6_cmp_addr,
1013 .scope = sctp_v6_scope,
1014 .addr_valid = sctp_v6_addr_valid,
1015 .inaddr_any = sctp_v6_inaddr_any,
1016 .is_any = sctp_v6_is_any,
1017 .available = sctp_v6_available,
1018 .skb_iif = sctp_v6_skb_iif,
1019 .is_ce = sctp_v6_is_ce,
1020 .seq_dump_addr = sctp_v6_seq_dump_addr,
Vlad Yasevichb9031d92008-06-04 12:40:15 -07001021 .ecn_capable = sctp_v6_ecn_capable,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001022 .net_header_len = sizeof(struct ipv6hdr),
1023 .sockaddr_len = sizeof(struct sockaddr_in6),
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001024#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001025 .compat_setsockopt = compat_ipv6_setsockopt,
1026 .compat_getsockopt = compat_ipv6_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001027#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001028};
1029
Neil Horman15efbe72008-02-15 09:53:59 -05001030static struct sctp_pf sctp_pf_inet6 = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031 .event_msgname = sctp_inet6_event_msgname,
1032 .skb_msgname = sctp_inet6_skb_msgname,
1033 .af_supported = sctp_inet6_af_supported,
1034 .cmp_addr = sctp_inet6_cmp_addr,
1035 .bind_verify = sctp_inet6_bind_verify,
1036 .send_verify = sctp_inet6_send_verify,
1037 .supported_addrs = sctp_inet6_supported_addrs,
1038 .create_accept_sk = sctp_v6_create_accept_sk,
1039 .addr_v4map = sctp_v6_addr_v4map,
Neil Horman15efbe72008-02-15 09:53:59 -05001040 .af = &sctp_af_inet6,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041};
1042
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001043/* Initialize IPv6 support and register with socket layer. */
Vlad Yasevich270637a2008-03-20 15:17:14 -07001044void sctp_v6_pf_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046 /* Register the SCTP specific PF_INET6 functions. */
Neil Horman15efbe72008-02-15 09:53:59 -05001047 sctp_register_pf(&sctp_pf_inet6, PF_INET6);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048
1049 /* Register the SCTP specific AF_INET6 functions. */
Neil Horman15efbe72008-02-15 09:53:59 -05001050 sctp_register_af(&sctp_af_inet6);
Vlad Yasevich270637a2008-03-20 15:17:14 -07001051}
1052
1053void sctp_v6_pf_exit(void)
1054{
1055 list_del(&sctp_af_inet6.list);
1056}
1057
1058/* Initialize IPv6 support and register with socket layer. */
1059int sctp_v6_protosw_init(void)
1060{
1061 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001062
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001063 rc = proto_register(&sctpv6_prot, 1);
1064 if (rc)
1065 return rc;
1066
1067 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
1068 inet6_register_protosw(&sctpv6_seqpacket_protosw);
1069 inet6_register_protosw(&sctpv6_stream_protosw);
1070
1071 return 0;
1072}
1073
Vlad Yasevich270637a2008-03-20 15:17:14 -07001074void sctp_v6_protosw_exit(void)
1075{
1076 inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
1077 inet6_unregister_protosw(&sctpv6_stream_protosw);
1078 proto_unregister(&sctpv6_prot);
1079}
1080
1081
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001082/* Register with inet6 layer. */
1083int sctp_v6_add_protocol(void)
1084{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085 /* Register notifier for inet6 address additions/deletions. */
1086 register_inet6addr_notifier(&sctp_inet6addr_notifier);
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001087
1088 if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0)
1089 return -EAGAIN;
1090
1091 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001092}
1093
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001094/* Unregister with inet6 layer. */
1095void sctp_v6_del_protocol(void)
1096{
1097 inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP);
1098 unregister_inet6addr_notifier(&sctp_inet6addr_notifier);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099}