blob: f3f0f4dc31dd3adf33033e071e02cb891b982719 [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
Joe Perches145ce502010-08-24 13:21:08 +000050#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
51
Linus Torvalds1da177e2005-04-16 15:20:36 -070052#include <linux/module.h>
53#include <linux/errno.h>
54#include <linux/types.h>
55#include <linux/socket.h>
56#include <linux/sockios.h>
57#include <linux/net.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070058#include <linux/in.h>
59#include <linux/in6.h>
60#include <linux/netdevice.h>
61#include <linux/init.h>
62#include <linux/ipsec.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090063#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070064
65#include <linux/ipv6.h>
66#include <linux/icmpv6.h>
67#include <linux/random.h>
68#include <linux/seq_file.h>
69
70#include <net/protocol.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070071#include <net/ndisc.h>
Arnaldo Carvalho de Meloc752f072005-08-09 20:08:28 -070072#include <net/ip.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070073#include <net/ipv6.h>
74#include <net/transp_v6.h>
75#include <net/addrconf.h>
76#include <net/ip6_route.h>
77#include <net/inet_common.h>
78#include <net/inet_ecn.h>
79#include <net/sctp/sctp.h>
80
81#include <asm/uaccess.h>
82
Weixing Shi62503412011-04-26 21:36:32 +000083static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
84 union sctp_addr *s2);
Vlad Yasevich9914ae32011-04-26 21:51:31 +000085static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr,
86 __be16 port);
87static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
88 const union sctp_addr *addr2);
Weixing Shi62503412011-04-26 21:36:32 +000089
Vlad Yasevich29303542007-09-16 16:02:12 -070090/* Event handler for inet6 address addition/deletion events.
91 * The sctp_local_addr_list needs to be protocted by a spin lock since
92 * multiple notifiers (say IPv4 and IPv6) may be running at the same
93 * time and thus corrupt the list.
94 * The reader side is protected with RCU.
95 */
Adrian Bunk24123182006-12-20 16:08:22 -080096static int sctp_inet6addr_event(struct notifier_block *this, unsigned long ev,
97 void *ptr)
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -080098{
99 struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
Vlad Yasevich29303542007-09-16 16:02:12 -0700100 struct sctp_sockaddr_entry *addr = NULL;
101 struct sctp_sockaddr_entry *temp;
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000102 struct net *net = dev_net(ifa->idev->dev);
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -0700103 int found = 0;
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800104
105 switch (ev) {
106 case NETDEV_UP:
107 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
108 if (addr) {
109 addr->a.v6.sin6_family = AF_INET6;
110 addr->a.v6.sin6_port = 0;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000111 addr->a.v6.sin6_addr = ifa->addr;
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800112 addr->a.v6.sin6_scope_id = ifa->idev->dev->ifindex;
Vlad Yasevich29303542007-09-16 16:02:12 -0700113 addr->valid = 1;
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000114 spin_lock_bh(&net->sctp.local_addr_lock);
115 list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
116 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
117 spin_unlock_bh(&net->sctp.local_addr_lock);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800118 }
119 break;
120 case NETDEV_DOWN:
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000121 spin_lock_bh(&net->sctp.local_addr_lock);
Vlad Yasevich29303542007-09-16 16:02:12 -0700122 list_for_each_entry_safe(addr, temp,
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000123 &net->sctp.local_addr_list, list) {
Pavel Emelyanova40a7d12008-04-12 18:40:38 -0700124 if (addr->a.sa.sa_family == AF_INET6 &&
125 ipv6_addr_equal(&addr->a.v6.sin6_addr,
126 &ifa->addr)) {
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000127 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -0700128 found = 1;
Vlad Yasevich29303542007-09-16 16:02:12 -0700129 addr->valid = 0;
130 list_del_rcu(&addr->list);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800131 break;
132 }
133 }
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000134 spin_unlock_bh(&net->sctp.local_addr_lock);
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -0700135 if (found)
Lai Jiangshan1231f0b2011-03-15 18:05:02 +0800136 kfree_rcu(addr, rcu);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800137 break;
138 }
139
140 return NOTIFY_DONE;
141}
142
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143static struct notifier_block sctp_inet6addr_notifier = {
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800144 .notifier_call = sctp_inet6addr_event,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145};
146
147/* ICMP error handler. */
148SCTP_STATIC void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700149 u8 type, u8 code, int offset, __be32 info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150{
151 struct inet6_dev *idev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 struct sock *sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 struct sctp_association *asoc;
154 struct sctp_transport *transport;
155 struct ipv6_pinfo *np;
Arnaldo Carvalho de Melo2e07fa92007-04-10 21:22:35 -0700156 sk_buff_data_t saveip, savesctp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 int err;
Eric W. Biederman4110cc22012-08-06 08:41:13 +0000158 struct net *net = dev_net(skb->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159
160 idev = in6_dev_get(skb->dev);
161
162 /* Fix up skb to look at the embedded net header. */
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700163 saveip = skb->network_header;
164 savesctp = skb->transport_header;
Arnaldo Carvalho de Melo1ced98e2007-03-10 19:57:15 -0300165 skb_reset_network_header(skb);
Arnaldo Carvalho de Meloa27ef742007-03-13 17:17:10 -0300166 skb_set_transport_header(skb, offset);
Eric W. Biederman4110cc22012-08-06 08:41:13 +0000167 sk = sctp_err_lookup(net, AF_INET6, skb, sctp_hdr(skb), &asoc, &transport);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 /* Put back, the original pointers. */
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700169 skb->network_header = saveip;
170 skb->transport_header = savesctp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 if (!sk) {
Eric W. Biedermanb01a2402012-08-06 08:47:55 +0000172 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_INERRORS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 goto out;
174 }
175
176 /* Warning: The sock lock is held. Remember to call
177 * sctp_err_finish!
178 */
179
180 switch (type) {
181 case ICMPV6_PKT_TOOBIG:
182 sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info));
183 goto out_unlock;
184 case ICMPV6_PARAMPROB:
185 if (ICMPV6_UNK_NEXTHDR == code) {
Sridhar Samudralad1ad1ff2005-07-18 13:44:10 -0700186 sctp_icmp_proto_unreachable(sk, asoc, transport);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 goto out_unlock;
188 }
189 break;
David S. Millerec18d9a2012-07-12 00:25:15 -0700190 case NDISC_REDIRECT:
191 sctp_icmp_redirect(sk, transport, skb);
192 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 default:
194 break;
195 }
196
197 np = inet6_sk(sk);
198 icmpv6_err_convert(type, code, &err);
199 if (!sock_owned_by_user(sk) && np->recverr) {
200 sk->sk_err = err;
201 sk->sk_error_report(sk);
202 } else { /* Only an error on timeout */
203 sk->sk_err_soft = err;
204 }
205
206out_unlock:
Sridhar Samudralad1ad1ff2005-07-18 13:44:10 -0700207 sctp_err_finish(sk, asoc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208out:
209 if (likely(idev != NULL))
210 in6_dev_put(idev);
211}
212
213/* Based on tcp_v6_xmit() in tcp_ipv6.c. */
Herbert Xuf8803742008-08-03 21:15:08 -0700214static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215{
216 struct sock *sk = skb->sk;
217 struct ipv6_pinfo *np = inet6_sk(sk);
David S. Miller4c9483b2011-03-12 16:22:43 -0500218 struct flowi6 fl6;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219
David S. Miller4c9483b2011-03-12 16:22:43 -0500220 memset(&fl6, 0, sizeof(fl6));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221
David S. Miller4c9483b2011-03-12 16:22:43 -0500222 fl6.flowi6_proto = sk->sk_protocol;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223
224 /* Fill in the dest address from the route entry passed with the skb
225 * and the source address from the transport.
226 */
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000227 fl6.daddr = transport->ipaddr.v6.sin6_addr;
228 fl6.saddr = transport->saddr.v6.sin6_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229
David S. Miller4c9483b2011-03-12 16:22:43 -0500230 fl6.flowlabel = np->flow_label;
231 IP6_ECN_flow_xmit(sk, fl6.flowlabel);
232 if (ipv6_addr_type(&fl6.saddr) & IPV6_ADDR_LINKLOCAL)
233 fl6.flowi6_oif = transport->saddr.v6.sin6_scope_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 else
David S. Miller4c9483b2011-03-12 16:22:43 -0500235 fl6.flowi6_oif = sk->sk_bound_dev_if;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236
237 if (np->opt && np->opt->srcrt) {
238 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000239 fl6.daddr = *rt0->addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 }
241
Harvey Harrison5b095d9892008-10-29 12:52:50 -0700242 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800243 __func__, skb, skb->len,
David S. Miller4c9483b2011-03-12 16:22:43 -0500244 &fl6.saddr, &fl6.daddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245
Eric W. Biedermanb01a2402012-08-06 08:47:55 +0000246 SCTP_INC_STATS(sock_net(sk), SCTP_MIB_OUTSCTPPACKS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247
Herbert Xuf8803742008-08-03 21:15:08 -0700248 if (!(transport->param_flags & SPP_PMTUD_ENABLE))
249 skb->local_df = 1;
250
Eric Dumazetb903d322011-10-27 00:44:35 -0400251 return ip6_xmit(sk, skb, &fl6, np->opt, np->tclass);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252}
253
254/* Returns the dst cache entry for the given source and destination ip
255 * addresses.
256 */
Vlad Yasevichda0420b2011-04-26 21:54:17 +0000257static void sctp_v6_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
258 struct flowi *fl, struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259{
Vlad Yasevichda0420b2011-04-26 21:54:17 +0000260 struct sctp_association *asoc = t->asoc;
Weixing Shi62503412011-04-26 21:36:32 +0000261 struct dst_entry *dst = NULL;
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000262 struct flowi6 *fl6 = &fl->u.ip6;
Weixing Shi62503412011-04-26 21:36:32 +0000263 struct sctp_bind_addr *bp;
264 struct sctp_sockaddr_entry *laddr;
265 union sctp_addr *baddr = NULL;
Vlad Yasevichda0420b2011-04-26 21:54:17 +0000266 union sctp_addr *daddr = &t->ipaddr;
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000267 union sctp_addr dst_saddr;
Weixing Shi62503412011-04-26 21:36:32 +0000268 __u8 matchlen = 0;
269 __u8 bmatchlen;
270 sctp_scope_t scope;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000272 memset(fl6, 0, sizeof(struct flowi6));
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000273 fl6->daddr = daddr->v6.sin6_addr;
Vlad Yasevich9c6a02f2011-04-26 21:52:27 +0000274 fl6->fl6_dport = daddr->v6.sin6_port;
275 fl6->flowi6_proto = IPPROTO_SCTP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000277 fl6->flowi6_oif = daddr->v6.sin6_scope_id;
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900278
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000279 SCTP_DEBUG_PRINTK("%s: DST=%pI6 ", __func__, &fl6->daddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280
Vlad Yasevich9c6a02f2011-04-26 21:52:27 +0000281 if (asoc)
282 fl6->fl6_sport = htons(asoc->base.bind_addr.port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283
284 if (saddr) {
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000285 fl6->saddr = saddr->v6.sin6_addr;
Vlad Yasevich9c6a02f2011-04-26 21:52:27 +0000286 fl6->fl6_sport = saddr->v6.sin6_port;
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000287 SCTP_DEBUG_PRINTK("SRC=%pI6 - ", &fl6->saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 }
289
Vlad Yasevich9c6a02f2011-04-26 21:52:27 +0000290 dst = ip6_dst_lookup_flow(sk, fl6, NULL, false);
Weixing Shi62503412011-04-26 21:36:32 +0000291 if (!asoc || saddr)
292 goto out;
293
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000294 bp = &asoc->base.bind_addr;
295 scope = sctp_scope(daddr);
296 /* ip6_dst_lookup has filled in the fl6->saddr for us. Check
297 * to see if we can use it.
298 */
Vlad Yasevich9c6a02f2011-04-26 21:52:27 +0000299 if (!IS_ERR(dst)) {
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000300 /* Walk through the bind address list and look for a bind
301 * address that matches the source address of the returned dst.
Weixing Shi62503412011-04-26 21:36:32 +0000302 */
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000303 sctp_v6_to_addr(&dst_saddr, &fl6->saddr, htons(bp->port));
Weixing Shi62503412011-04-26 21:36:32 +0000304 rcu_read_lock();
305 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000306 if (!laddr->valid || (laddr->state != SCTP_ADDR_SRC))
Weixing Shi62503412011-04-26 21:36:32 +0000307 continue;
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000308
309 /* Do not compare against v4 addrs */
310 if ((laddr->a.sa.sa_family == AF_INET6) &&
311 (sctp_v6_cmp_addr(&dst_saddr, &laddr->a))) {
312 rcu_read_unlock();
313 goto out;
Weixing Shi62503412011-04-26 21:36:32 +0000314 }
315 }
316 rcu_read_unlock();
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000317 /* None of the bound addresses match the source address of the
318 * dst. So release it.
319 */
320 dst_release(dst);
321 dst = NULL;
322 }
323
324 /* Walk through the bind address list and try to get the
325 * best source address for a given destination.
326 */
327 rcu_read_lock();
328 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
329 if (!laddr->valid && laddr->state != SCTP_ADDR_SRC)
330 continue;
331 if ((laddr->a.sa.sa_family == AF_INET6) &&
332 (scope <= sctp_scope(&laddr->a))) {
333 bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a);
334 if (!baddr || (matchlen < bmatchlen)) {
335 baddr = &laddr->a;
336 matchlen = bmatchlen;
337 }
Weixing Shi62503412011-04-26 21:36:32 +0000338 }
339 }
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000340 rcu_read_unlock();
341 if (baddr) {
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000342 fl6->saddr = baddr->v6.sin6_addr;
Vlad Yasevich9c6a02f2011-04-26 21:52:27 +0000343 fl6->fl6_sport = baddr->v6.sin6_port;
344 dst = ip6_dst_lookup_flow(sk, fl6, NULL, false);
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000345 }
346
Weixing Shi62503412011-04-26 21:36:32 +0000347out:
Tommi Rantalaee3f34e2012-11-29 23:17:42 +0000348 if (!IS_ERR_OR_NULL(dst)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 struct rt6_info *rt;
350 rt = (struct rt6_info *)dst;
Vlad Yasevichda0420b2011-04-26 21:54:17 +0000351 t->dst = dst;
Harvey Harrison5b095d9892008-10-29 12:52:50 -0700352 SCTP_DEBUG_PRINTK("rt6_dst:%pI6 rt6_src:%pI6\n",
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000353 &rt->rt6i_dst.addr, &fl6->saddr);
Vlad Yasevichda0420b2011-04-26 21:54:17 +0000354 } else {
355 t->dst = NULL;
356 SCTP_DEBUG_PRINTK("NO ROUTE\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358}
359
360/* Returns the number of consecutive initial bits that match in the 2 ipv6
361 * addresses.
362 */
363static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
364 union sctp_addr *s2)
365{
YOSHIFUJI Hideaki / 吉藤英明de7737e2010-03-26 08:34:30 +0000366 return ipv6_addr_diff(&s1->v6.sin6_addr, &s2->v6.sin6_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367}
368
369/* Fills in the source address(saddr) based on the destination address(daddr)
370 * and asoc's bind address list.
371 */
YOSHIFUJI Hideakie5117102008-05-29 19:55:05 +0900372static void sctp_v6_get_saddr(struct sctp_sock *sk,
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000373 struct sctp_transport *t,
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000374 struct flowi *fl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375{
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000376 struct flowi6 *fl6 = &fl->u.ip6;
377 union sctp_addr *saddr = &t->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378
Vlad Yasevichaf138472011-04-26 21:53:20 +0000379 SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p\n", __func__, t->asoc, t->dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000381 if (t->dst) {
382 saddr->v6.sin6_family = AF_INET6;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000383 saddr->v6.sin6_addr = fl6->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385}
386
387/* Make a copy of all potential local addresses. */
388static void sctp_v6_copy_addrlist(struct list_head *addrlist,
389 struct net_device *dev)
390{
391 struct inet6_dev *in6_dev;
392 struct inet6_ifaddr *ifp;
393 struct sctp_sockaddr_entry *addr;
394
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -0700395 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 if ((in6_dev = __in6_dev_get(dev)) == NULL) {
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -0700397 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 return;
399 }
400
Jarek Poplawskie2eb8d42007-03-08 14:43:41 -0800401 read_lock_bh(&in6_dev->lock);
stephen hemminger502a2ff2010-03-17 20:31:13 +0000402 list_for_each_entry(ifp, &in6_dev->addr_list, if_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403 /* Add the address to the local list. */
404 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
405 if (addr) {
Al Viro2a6fd782006-11-20 17:04:42 -0800406 addr->a.v6.sin6_family = AF_INET6;
407 addr->a.v6.sin6_port = 0;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000408 addr->a.v6.sin6_addr = ifp->addr;
Al Viro2a6fd782006-11-20 17:04:42 -0800409 addr->a.v6.sin6_scope_id = dev->ifindex;
Vlad Yasevich29303542007-09-16 16:02:12 -0700410 addr->valid = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 INIT_LIST_HEAD(&addr->list);
412 list_add_tail(&addr->list, addrlist);
413 }
414 }
415
Jarek Poplawskie2eb8d42007-03-08 14:43:41 -0800416 read_unlock_bh(&in6_dev->lock);
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -0700417 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418}
419
420/* Initialize a sockaddr_storage from in incoming skb. */
421static void sctp_v6_from_skb(union sctp_addr *addr,struct sk_buff *skb,
422 int is_saddr)
423{
Al Virod55c41b2006-11-20 17:09:40 -0800424 __be16 *port;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 struct sctphdr *sh;
426
427 port = &addr->v6.sin6_port;
428 addr->v6.sin6_family = AF_INET6;
429 addr->v6.sin6_flowinfo = 0; /* FIXME */
430 addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif;
431
Arnaldo Carvalho de Melo2c0fd382007-03-13 13:59:32 -0300432 sh = sctp_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 if (is_saddr) {
Al Virod55c41b2006-11-20 17:09:40 -0800434 *port = sh->source;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000435 addr->v6.sin6_addr = ipv6_hdr(skb)->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 } else {
Al Virod55c41b2006-11-20 17:09:40 -0800437 *port = sh->dest;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000438 addr->v6.sin6_addr = ipv6_hdr(skb)->daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440}
441
442/* Initialize an sctp_addr from a socket. */
443static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk)
444{
445 addr->v6.sin6_family = AF_INET6;
Al Viro7dcdbd92006-11-20 17:24:21 -0800446 addr->v6.sin6_port = 0;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000447 addr->v6.sin6_addr = inet6_sk(sk)->rcv_saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448}
449
450/* Initialize sk->sk_rcv_saddr from sctp_addr. */
451static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
452{
453 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
454 inet6_sk(sk)->rcv_saddr.s6_addr32[0] = 0;
455 inet6_sk(sk)->rcv_saddr.s6_addr32[1] = 0;
456 inet6_sk(sk)->rcv_saddr.s6_addr32[2] = htonl(0x0000ffff);
457 inet6_sk(sk)->rcv_saddr.s6_addr32[3] =
458 addr->v4.sin_addr.s_addr;
459 } else {
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000460 inet6_sk(sk)->rcv_saddr = addr->v6.sin6_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 }
462}
463
464/* Initialize sk->sk_daddr from sctp_addr. */
465static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
466{
467 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
468 inet6_sk(sk)->daddr.s6_addr32[0] = 0;
469 inet6_sk(sk)->daddr.s6_addr32[1] = 0;
470 inet6_sk(sk)->daddr.s6_addr32[2] = htonl(0x0000ffff);
471 inet6_sk(sk)->daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
472 } else {
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000473 inet6_sk(sk)->daddr = addr->v6.sin6_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 }
475}
476
477/* Initialize a sctp_addr from an address parameter. */
478static void sctp_v6_from_addr_param(union sctp_addr *addr,
479 union sctp_addr_param *param,
Al Virodd86d132006-11-20 17:11:13 -0800480 __be16 port, int iif)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481{
482 addr->v6.sin6_family = AF_INET6;
483 addr->v6.sin6_port = port;
484 addr->v6.sin6_flowinfo = 0; /* BUG */
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000485 addr->v6.sin6_addr = param->v6.addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 addr->v6.sin6_scope_id = iif;
487}
488
489/* Initialize an address parameter from a sctp_addr and return the length
490 * of the address parameter.
491 */
492static int sctp_v6_to_addr_param(const union sctp_addr *addr,
493 union sctp_addr_param *param)
494{
495 int length = sizeof(sctp_ipv6addr_param_t);
496
497 param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS;
Al Virodbc16db2006-11-20 17:01:42 -0800498 param->v6.param_hdr.length = htons(length);
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000499 param->v6.addr = addr->v6.sin6_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500
501 return length;
502}
503
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000504/* Initialize a sctp_addr from struct in6_addr. */
505static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr,
Al Viro854d43a2006-11-20 17:06:24 -0800506 __be16 port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 addr->sa.sa_family = AF_INET6;
509 addr->v6.sin6_port = port;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000510 addr->v6.sin6_addr = *saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511}
512
513/* Compare addresses exactly.
514 * v4-mapped-v6 is also in consideration.
515 */
516static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
517 const union sctp_addr *addr2)
518{
519 if (addr1->sa.sa_family != addr2->sa.sa_family) {
520 if (addr1->sa.sa_family == AF_INET &&
521 addr2->sa.sa_family == AF_INET6 &&
Brian Haleye773e4f2007-08-24 23:16:08 -0700522 ipv6_addr_v4mapped(&addr2->v6.sin6_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 if (addr2->v6.sin6_port == addr1->v4.sin_port &&
524 addr2->v6.sin6_addr.s6_addr32[3] ==
525 addr1->v4.sin_addr.s_addr)
526 return 1;
527 }
528 if (addr2->sa.sa_family == AF_INET &&
529 addr1->sa.sa_family == AF_INET6 &&
Brian Haleye773e4f2007-08-24 23:16:08 -0700530 ipv6_addr_v4mapped(&addr1->v6.sin6_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 if (addr1->v6.sin6_port == addr2->v4.sin_port &&
532 addr1->v6.sin6_addr.s6_addr32[3] ==
533 addr2->v4.sin_addr.s_addr)
534 return 1;
535 }
536 return 0;
537 }
538 if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr))
539 return 0;
540 /* If this is a linklocal address, compare the scope_id. */
541 if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) {
542 if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id &&
543 (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) {
544 return 0;
545 }
546 }
547
548 return 1;
549}
550
551/* Initialize addr struct to INADDR_ANY. */
Al Viro6fbfa9f2006-11-20 17:24:53 -0800552static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553{
554 memset(addr, 0x00, sizeof(union sctp_addr));
555 addr->v6.sin6_family = AF_INET6;
556 addr->v6.sin6_port = port;
557}
558
559/* Is this a wildcard address? */
560static int sctp_v6_is_any(const union sctp_addr *addr)
561{
Brian Haleyb9b9e102005-04-28 11:59:16 -0700562 return ipv6_addr_any(&addr->v6.sin6_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563}
564
565/* Should this be available for binding? */
566static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp)
567{
568 int type;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000569 const struct in6_addr *in6 = (const struct in6_addr *)&addr->v6.sin6_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570
571 type = ipv6_addr_type(in6);
572 if (IPV6_ADDR_ANY == type)
573 return 1;
574 if (type == IPV6_ADDR_MAPPED) {
575 if (sp && !sp->v4mapped)
576 return 0;
577 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
578 return 0;
579 sctp_v6_map_v4(addr);
580 return sctp_get_af_specific(AF_INET)->available(addr, sp);
581 }
582 if (!(type & IPV6_ADDR_UNICAST))
583 return 0;
584
Eric W. Biedermanbb2db452012-08-06 08:46:26 +0000585 return ipv6_chk_addr(sock_net(&sp->inet.sk), in6, NULL, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586}
587
588/* This function checks if the address is a valid address to be used for
589 * SCTP.
590 *
591 * Output:
592 * Return 0 - If the address is a non-unicast or an illegal address.
593 * Return 1 - If the address is a unicast.
594 */
Vlad Yasevich5636bef2006-06-17 22:55:35 -0700595static int sctp_v6_addr_valid(union sctp_addr *addr,
596 struct sctp_sock *sp,
597 const struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598{
599 int ret = ipv6_addr_type(&addr->v6.sin6_addr);
600
601 /* Support v4-mapped-v6 address. */
602 if (ret == IPV6_ADDR_MAPPED) {
603 /* Note: This routine is used in input, so v4-mapped-v6
604 * are disallowed here when there is no sctp_sock.
605 */
606 if (!sp || !sp->v4mapped)
607 return 0;
608 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
609 return 0;
610 sctp_v6_map_v4(addr);
Vlad Yasevich5636bef2006-06-17 22:55:35 -0700611 return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612 }
613
614 /* Is this a non-unicast address */
615 if (!(ret & IPV6_ADDR_UNICAST))
616 return 0;
617
618 return 1;
619}
620
621/* What is the scope of 'addr'? */
622static sctp_scope_t sctp_v6_scope(union sctp_addr *addr)
623{
624 int v6scope;
625 sctp_scope_t retval;
626
627 /* The IPv6 scope is really a set of bit fields.
628 * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope.
629 */
630
631 v6scope = ipv6_addr_scope(&addr->v6.sin6_addr);
632 switch (v6scope) {
633 case IFA_HOST:
634 retval = SCTP_SCOPE_LOOPBACK;
635 break;
636 case IFA_LINK:
637 retval = SCTP_SCOPE_LINK;
638 break;
639 case IFA_SITE:
640 retval = SCTP_SCOPE_PRIVATE;
641 break;
642 default:
643 retval = SCTP_SCOPE_GLOBAL;
644 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700645 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646
647 return retval;
648}
649
650/* Create and initialize a new sk for the socket to be returned by accept(). */
651static struct sock *sctp_v6_create_accept_sk(struct sock *sk,
652 struct sctp_association *asoc)
653{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654 struct sock *newsk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
656 struct sctp6_sock *newsctp6sk;
657
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900658 newsk = sk_alloc(sock_net(sk), PF_INET6, GFP_KERNEL, sk->sk_prot);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659 if (!newsk)
660 goto out;
661
662 sock_init_data(NULL, newsk);
663
Vlad Yasevich914e1c82009-02-13 08:33:44 +0000664 sctp_copy_sock(newsk, sk, asoc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665 sock_reset_flag(sk, SOCK_ZAPPED);
666
667 newsctp6sk = (struct sctp6_sock *)newsk;
668 inet_sk(newsk)->pinet6 = &newsctp6sk->inet6;
669
Dave Johnsonb225b882007-07-25 19:49:29 -0400670 sctp_sk(newsk)->v4mapped = sctp_sk(sk)->v4mapped;
671
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672 newnp = inet6_sk(newsk);
673
674 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
675
676 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
677 * and getpeername().
678 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679 sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);
680
Arnaldo Carvalho de Meloe6848972005-08-09 19:45:38 -0700681 sk_refcnt_debug_inc(newsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682
683 if (newsk->sk_prot->init(newsk)) {
684 sk_common_release(newsk);
685 newsk = NULL;
686 }
687
688out:
689 return newsk;
690}
691
692/* Map v4 address to mapped v6 address */
693static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
694{
695 if (sp->v4mapped && AF_INET == addr->sa.sa_family)
696 sctp_v4_map_v6(addr);
697}
698
699/* Where did this skb come from? */
700static int sctp_v6_skb_iif(const struct sk_buff *skb)
701{
702 struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
703 return opt->iif;
704}
705
706/* Was this packet marked by Explicit Congestion Notification? */
707static int sctp_v6_is_ce(const struct sk_buff *skb)
708{
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700709 return *((__u32 *)(ipv6_hdr(skb))) & htonl(1 << 20);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710}
711
712/* Dump the v6 addr to the seq file. */
713static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
714{
Harvey Harrison5b095d9892008-10-29 12:52:50 -0700715 seq_printf(seq, "%pI6 ", &addr->v6.sin6_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716}
717
Vlad Yasevichb9031d92008-06-04 12:40:15 -0700718static void sctp_v6_ecn_capable(struct sock *sk)
719{
720 inet6_sk(sk)->tclass |= INET_ECN_ECT_0;
721}
722
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723/* Initialize a PF_INET6 socket msg_name. */
724static void sctp_inet6_msgname(char *msgname, int *addr_len)
725{
726 struct sockaddr_in6 *sin6;
727
728 sin6 = (struct sockaddr_in6 *)msgname;
729 sin6->sin6_family = AF_INET6;
730 sin6->sin6_flowinfo = 0;
731 sin6->sin6_scope_id = 0; /*FIXME */
732 *addr_len = sizeof(struct sockaddr_in6);
733}
734
735/* Initialize a PF_INET msgname from a ulpevent. */
736static void sctp_inet6_event_msgname(struct sctp_ulpevent *event,
737 char *msgname, int *addrlen)
738{
739 struct sockaddr_in6 *sin6, *sin6from;
740
741 if (msgname) {
742 union sctp_addr *addr;
743 struct sctp_association *asoc;
744
745 asoc = event->asoc;
746 sctp_inet6_msgname(msgname, addrlen);
747 sin6 = (struct sockaddr_in6 *)msgname;
748 sin6->sin6_port = htons(asoc->peer.port);
749 addr = &asoc->peer.primary_addr;
750
751 /* Note: If we go to a common v6 format, this code
752 * will change.
753 */
754
755 /* Map ipv4 address into v4-mapped-on-v6 address. */
756 if (sctp_sk(asoc->base.sk)->v4mapped &&
757 AF_INET == addr->sa.sa_family) {
758 sctp_v4_map_v6((union sctp_addr *)sin6);
759 sin6->sin6_addr.s6_addr32[3] =
760 addr->v4.sin_addr.s_addr;
761 return;
762 }
763
764 sin6from = &asoc->peer.primary_addr.v6;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000765 sin6->sin6_addr = sin6from->sin6_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
767 sin6->sin6_scope_id = sin6from->sin6_scope_id;
768 }
769}
770
771/* Initialize a msg_name from an inbound skb. */
772static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname,
773 int *addr_len)
774{
775 struct sctphdr *sh;
776 struct sockaddr_in6 *sin6;
777
778 if (msgname) {
779 sctp_inet6_msgname(msgname, addr_len);
780 sin6 = (struct sockaddr_in6 *)msgname;
Arnaldo Carvalho de Melo2c0fd382007-03-13 13:59:32 -0300781 sh = sctp_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782 sin6->sin6_port = sh->source;
783
784 /* Map ipv4 address into v4-mapped-on-v6 address. */
785 if (sctp_sk(skb->sk)->v4mapped &&
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700786 ip_hdr(skb)->version == 4) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787 sctp_v4_map_v6((union sctp_addr *)sin6);
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700788 sin6->sin6_addr.s6_addr32[3] = ip_hdr(skb)->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789 return;
790 }
791
792 /* Otherwise, just copy the v6 address. */
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000793 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) {
795 struct sctp_ulpevent *ev = sctp_skb2event(skb);
796 sin6->sin6_scope_id = ev->iif;
797 }
798 }
799}
800
801/* Do we support this AF? */
802static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp)
803{
804 switch (family) {
805 case AF_INET6:
806 return 1;
807 /* v4-mapped-v6 addresses */
808 case AF_INET:
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700809 if (!__ipv6_only_sock(sctp_opt2sk(sp)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810 return 1;
811 default:
812 return 0;
813 }
814}
815
816/* Address matching with wildcards allowed. This extra level
817 * of indirection lets us choose whether a PF_INET6 should
818 * disallow any v4 addresses if we so choose.
819 */
820static int sctp_inet6_cmp_addr(const union sctp_addr *addr1,
821 const union sctp_addr *addr2,
822 struct sctp_sock *opt)
823{
824 struct sctp_af *af1, *af2;
Vlad Yasevich52cae8f2008-08-18 10:34:34 -0400825 struct sock *sk = sctp_opt2sk(opt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826
827 af1 = sctp_get_af_specific(addr1->sa.sa_family);
828 af2 = sctp_get_af_specific(addr2->sa.sa_family);
829
830 if (!af1 || !af2)
831 return 0;
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700832
833 /* If the socket is IPv6 only, v4 addrs will not match */
Vlad Yasevich52cae8f2008-08-18 10:34:34 -0400834 if (__ipv6_only_sock(sk) && af1 != af2)
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700835 return 0;
836
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837 /* Today, wildcard AF_INET/AF_INET6. */
Vlad Yasevich52cae8f2008-08-18 10:34:34 -0400838 if (sctp_is_any(sk, addr1) || sctp_is_any(sk, addr2))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839 return 1;
840
841 if (addr1->sa.sa_family != addr2->sa.sa_family)
842 return 0;
843
844 return af1->cmp_addr(addr1, addr2);
845}
846
847/* Verify that the provided sockaddr looks bindable. Common verification,
848 * has already been taken care of.
849 */
850static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
851{
852 struct sctp_af *af;
853
854 /* ASSERT: address family has already been verified. */
855 if (addr->sa.sa_family != AF_INET6)
856 af = sctp_get_af_specific(addr->sa.sa_family);
857 else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858 int type = ipv6_addr_type(&addr->v6.sin6_addr);
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700859 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700861 if (type & IPV6_ADDR_LINKLOCAL) {
Eric W. Biedermanbb2db452012-08-06 08:46:26 +0000862 struct net *net;
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700863 if (!addr->v6.sin6_scope_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864 return 0;
Eric W. Biedermanbb2db452012-08-06 08:46:26 +0000865 net = sock_net(&opt->inet.sk);
Eric Dumazet40c9c312009-11-05 20:56:46 -0800866 rcu_read_lock();
Eric W. Biedermanbb2db452012-08-06 08:46:26 +0000867 dev = dev_get_by_index_rcu(net, addr->v6.sin6_scope_id);
Eric Dumazet40c9c312009-11-05 20:56:46 -0800868 if (!dev ||
Eric W. Biedermanbb2db452012-08-06 08:46:26 +0000869 !ipv6_chk_addr(net, &addr->v6.sin6_addr, dev, 0)) {
Eric Dumazet40c9c312009-11-05 20:56:46 -0800870 rcu_read_unlock();
Vlad Yasevich1669d852007-07-03 14:29:23 -0400871 return 0;
872 }
Eric Dumazet40c9c312009-11-05 20:56:46 -0800873 rcu_read_unlock();
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700874 } else if (type == IPV6_ADDR_MAPPED) {
875 if (!opt->v4mapped)
876 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877 }
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700878
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879 af = opt->pf->af;
880 }
881 return af->available(addr, opt);
882}
883
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700884/* Verify that the provided sockaddr looks sendable. Common verification,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885 * has already been taken care of.
886 */
887static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
888{
889 struct sctp_af *af = NULL;
890
891 /* ASSERT: address family has already been verified. */
892 if (addr->sa.sa_family != AF_INET6)
893 af = sctp_get_af_specific(addr->sa.sa_family);
894 else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895 int type = ipv6_addr_type(&addr->v6.sin6_addr);
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700896 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700898 if (type & IPV6_ADDR_LINKLOCAL) {
899 if (!addr->v6.sin6_scope_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900 return 0;
Eric Dumazet40c9c312009-11-05 20:56:46 -0800901 rcu_read_lock();
Eric W. Biedermanbb2db452012-08-06 08:46:26 +0000902 dev = dev_get_by_index_rcu(sock_net(&opt->inet.sk),
Eric Dumazet40c9c312009-11-05 20:56:46 -0800903 addr->v6.sin6_scope_id);
904 rcu_read_unlock();
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700905 if (!dev)
906 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907 }
908 af = opt->pf->af;
909 }
910
911 return af != NULL;
912}
913
914/* Fill in Supported Address Type information for INIT and INIT-ACK
915 * chunks. Note: In the future, we may want to look at sock options
916 * to determine whether a PF_INET6 socket really wants to have IPV4
917 * addresses.
918 * Returns number of addresses supported.
919 */
920static int sctp_inet6_supported_addrs(const struct sctp_sock *opt,
Al Viro3dbe8652006-11-20 17:25:49 -0800921 __be16 *types)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922{
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700923 types[0] = SCTP_PARAM_IPV6_ADDRESS;
924 if (!opt || !ipv6_only_sock(sctp_opt2sk(opt))) {
925 types[1] = SCTP_PARAM_IPV4_ADDRESS;
926 return 2;
927 }
928 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929}
930
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800931static const struct proto_ops inet6_seqpacket_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800932 .family = PF_INET6,
933 .owner = THIS_MODULE,
934 .release = inet6_release,
935 .bind = inet6_bind,
936 .connect = inet_dgram_connect,
937 .socketpair = sock_no_socketpair,
938 .accept = inet_accept,
939 .getname = inet6_getname,
940 .poll = sctp_poll,
941 .ioctl = inet6_ioctl,
942 .listen = sctp_inet_listen,
943 .shutdown = inet_shutdown,
944 .setsockopt = sock_common_setsockopt,
945 .getsockopt = sock_common_getsockopt,
946 .sendmsg = inet_sendmsg,
947 .recvmsg = sock_common_recvmsg,
948 .mmap = sock_no_mmap,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800949#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800950 .compat_setsockopt = compat_sock_common_setsockopt,
951 .compat_getsockopt = compat_sock_common_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800952#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953};
954
955static struct inet_protosw sctpv6_seqpacket_protosw = {
956 .type = SOCK_SEQPACKET,
957 .protocol = IPPROTO_SCTP,
958 .prot = &sctpv6_prot,
959 .ops = &inet6_seqpacket_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960 .no_check = 0,
961 .flags = SCTP_PROTOSW_FLAG
962};
963static struct inet_protosw sctpv6_stream_protosw = {
964 .type = SOCK_STREAM,
965 .protocol = IPPROTO_SCTP,
966 .prot = &sctpv6_prot,
967 .ops = &inet6_seqpacket_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968 .no_check = 0,
969 .flags = SCTP_PROTOSW_FLAG,
970};
971
Herbert Xue5bbef22007-10-15 12:50:28 -0700972static int sctp6_rcv(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973{
Herbert Xue5bbef22007-10-15 12:50:28 -0700974 return sctp_rcv(skb) ? -1 : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975}
976
Alexey Dobriyan41135cc2009-09-14 12:22:28 +0000977static const struct inet6_protocol sctpv6_protocol = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978 .handler = sctp6_rcv,
979 .err_handler = sctp_v6_err,
980 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
981};
982
Neil Horman15efbe72008-02-15 09:53:59 -0500983static struct sctp_af sctp_af_inet6 = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800984 .sa_family = AF_INET6,
985 .sctp_xmit = sctp_v6_xmit,
986 .setsockopt = ipv6_setsockopt,
987 .getsockopt = ipv6_getsockopt,
988 .get_dst = sctp_v6_get_dst,
989 .get_saddr = sctp_v6_get_saddr,
990 .copy_addrlist = sctp_v6_copy_addrlist,
991 .from_skb = sctp_v6_from_skb,
992 .from_sk = sctp_v6_from_sk,
993 .to_sk_saddr = sctp_v6_to_sk_saddr,
994 .to_sk_daddr = sctp_v6_to_sk_daddr,
995 .from_addr_param = sctp_v6_from_addr_param,
996 .to_addr_param = sctp_v6_to_addr_param,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800997 .cmp_addr = sctp_v6_cmp_addr,
998 .scope = sctp_v6_scope,
999 .addr_valid = sctp_v6_addr_valid,
1000 .inaddr_any = sctp_v6_inaddr_any,
1001 .is_any = sctp_v6_is_any,
1002 .available = sctp_v6_available,
1003 .skb_iif = sctp_v6_skb_iif,
1004 .is_ce = sctp_v6_is_ce,
1005 .seq_dump_addr = sctp_v6_seq_dump_addr,
Vlad Yasevichb9031d92008-06-04 12:40:15 -07001006 .ecn_capable = sctp_v6_ecn_capable,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001007 .net_header_len = sizeof(struct ipv6hdr),
1008 .sockaddr_len = sizeof(struct sockaddr_in6),
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001009#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001010 .compat_setsockopt = compat_ipv6_setsockopt,
1011 .compat_getsockopt = compat_ipv6_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001012#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013};
1014
Neil Horman15efbe72008-02-15 09:53:59 -05001015static struct sctp_pf sctp_pf_inet6 = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016 .event_msgname = sctp_inet6_event_msgname,
1017 .skb_msgname = sctp_inet6_skb_msgname,
1018 .af_supported = sctp_inet6_af_supported,
1019 .cmp_addr = sctp_inet6_cmp_addr,
1020 .bind_verify = sctp_inet6_bind_verify,
1021 .send_verify = sctp_inet6_send_verify,
1022 .supported_addrs = sctp_inet6_supported_addrs,
1023 .create_accept_sk = sctp_v6_create_accept_sk,
1024 .addr_v4map = sctp_v6_addr_v4map,
Neil Horman15efbe72008-02-15 09:53:59 -05001025 .af = &sctp_af_inet6,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001026};
1027
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001028/* Initialize IPv6 support and register with socket layer. */
Vlad Yasevich270637a2008-03-20 15:17:14 -07001029void sctp_v6_pf_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031 /* Register the SCTP specific PF_INET6 functions. */
Neil Horman15efbe72008-02-15 09:53:59 -05001032 sctp_register_pf(&sctp_pf_inet6, PF_INET6);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033
1034 /* Register the SCTP specific AF_INET6 functions. */
Neil Horman15efbe72008-02-15 09:53:59 -05001035 sctp_register_af(&sctp_af_inet6);
Vlad Yasevich270637a2008-03-20 15:17:14 -07001036}
1037
1038void sctp_v6_pf_exit(void)
1039{
1040 list_del(&sctp_af_inet6.list);
1041}
1042
1043/* Initialize IPv6 support and register with socket layer. */
1044int sctp_v6_protosw_init(void)
1045{
1046 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001047
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001048 rc = proto_register(&sctpv6_prot, 1);
1049 if (rc)
1050 return rc;
1051
1052 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
1053 inet6_register_protosw(&sctpv6_seqpacket_protosw);
1054 inet6_register_protosw(&sctpv6_stream_protosw);
1055
1056 return 0;
1057}
1058
Vlad Yasevich270637a2008-03-20 15:17:14 -07001059void sctp_v6_protosw_exit(void)
1060{
1061 inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
1062 inet6_unregister_protosw(&sctpv6_stream_protosw);
1063 proto_unregister(&sctpv6_prot);
1064}
1065
1066
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001067/* Register with inet6 layer. */
1068int sctp_v6_add_protocol(void)
1069{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070 /* Register notifier for inet6 address additions/deletions. */
1071 register_inet6addr_notifier(&sctp_inet6addr_notifier);
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001072
1073 if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0)
1074 return -EAGAIN;
1075
1076 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077}
1078
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001079/* Unregister with inet6 layer. */
1080void sctp_v6_del_protocol(void)
1081{
1082 inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP);
1083 unregister_inet6addr_notifier(&sctp_inet6addr_notifier);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084}