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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
Jeff Kirsher4b2f13a2013-12-06 06:28:48 -080024 * along with GNU CC; see the file COPYING. If not, see
25 * <http://www.gnu.org/licenses/>.
Linus Torvalds1da177e2005-04-16 15:20:36 -070026 *
27 * Please send any bug reports or fixes you make to the
28 * email address(es):
Daniel Borkmann91705c62013-07-23 14:51:47 +020029 * lksctp developers <linux-sctp@vger.kernel.org>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070031 * Written or modified by:
32 * Le Yanqun <yanqun.le@nokia.com>
33 * Hui Huang <hui.huang@nokia.com>
34 * La Monte H.P. Yarroll <piggy@acm.org>
35 * Sridhar Samudrala <sri@us.ibm.com>
36 * Jon Grimm <jgrimm@us.ibm.com>
37 * Ardelle Fan <ardelle.fan@intel.com>
38 *
39 * Based on:
40 * linux/net/ipv6/tcp_ipv6.c
Linus Torvalds1da177e2005-04-16 15:20:36 -070041 */
42
Joe Perches145ce502010-08-24 13:21:08 +000043#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
44
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#include <linux/module.h>
46#include <linux/errno.h>
47#include <linux/types.h>
48#include <linux/socket.h>
49#include <linux/sockios.h>
50#include <linux/net.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070051#include <linux/in.h>
52#include <linux/in6.h>
53#include <linux/netdevice.h>
54#include <linux/init.h>
55#include <linux/ipsec.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090056#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
58#include <linux/ipv6.h>
59#include <linux/icmpv6.h>
60#include <linux/random.h>
61#include <linux/seq_file.h>
62
63#include <net/protocol.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070064#include <net/ndisc.h>
Arnaldo Carvalho de Meloc752f072005-08-09 20:08:28 -070065#include <net/ip.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070066#include <net/ipv6.h>
67#include <net/transp_v6.h>
68#include <net/addrconf.h>
69#include <net/ip6_route.h>
70#include <net/inet_common.h>
71#include <net/inet_ecn.h>
72#include <net/sctp/sctp.h>
73
74#include <asm/uaccess.h>
75
Weixing Shi62503412011-04-26 21:36:32 +000076static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
77 union sctp_addr *s2);
Vlad Yasevich9914ae32011-04-26 21:51:31 +000078static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr,
79 __be16 port);
80static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
81 const union sctp_addr *addr2);
Weixing Shi62503412011-04-26 21:36:32 +000082
Vlad Yasevich29303542007-09-16 16:02:12 -070083/* Event handler for inet6 address addition/deletion events.
84 * The sctp_local_addr_list needs to be protocted by a spin lock since
85 * multiple notifiers (say IPv4 and IPv6) may be running at the same
86 * time and thus corrupt the list.
87 * The reader side is protected with RCU.
88 */
Adrian Bunk24123182006-12-20 16:08:22 -080089static int sctp_inet6addr_event(struct notifier_block *this, unsigned long ev,
90 void *ptr)
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -080091{
92 struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
Vlad Yasevich29303542007-09-16 16:02:12 -070093 struct sctp_sockaddr_entry *addr = NULL;
94 struct sctp_sockaddr_entry *temp;
Eric W. Biederman4db67e82012-08-06 08:42:04 +000095 struct net *net = dev_net(ifa->idev->dev);
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -070096 int found = 0;
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -080097
98 switch (ev) {
99 case NETDEV_UP:
100 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
101 if (addr) {
102 addr->a.v6.sin6_family = AF_INET6;
103 addr->a.v6.sin6_port = 0;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000104 addr->a.v6.sin6_addr = ifa->addr;
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800105 addr->a.v6.sin6_scope_id = ifa->idev->dev->ifindex;
Vlad Yasevich29303542007-09-16 16:02:12 -0700106 addr->valid = 1;
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000107 spin_lock_bh(&net->sctp.local_addr_lock);
108 list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
109 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
110 spin_unlock_bh(&net->sctp.local_addr_lock);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800111 }
112 break;
113 case NETDEV_DOWN:
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000114 spin_lock_bh(&net->sctp.local_addr_lock);
Vlad Yasevich29303542007-09-16 16:02:12 -0700115 list_for_each_entry_safe(addr, temp,
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000116 &net->sctp.local_addr_list, list) {
Pavel Emelyanova40a7d12008-04-12 18:40:38 -0700117 if (addr->a.sa.sa_family == AF_INET6 &&
118 ipv6_addr_equal(&addr->a.v6.sin6_addr,
119 &ifa->addr)) {
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000120 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -0700121 found = 1;
Vlad Yasevich29303542007-09-16 16:02:12 -0700122 addr->valid = 0;
123 list_del_rcu(&addr->list);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800124 break;
125 }
126 }
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000127 spin_unlock_bh(&net->sctp.local_addr_lock);
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -0700128 if (found)
Lai Jiangshan1231f0b2011-03-15 18:05:02 +0800129 kfree_rcu(addr, rcu);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800130 break;
131 }
132
133 return NOTIFY_DONE;
134}
135
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136static struct notifier_block sctp_inet6addr_notifier = {
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800137 .notifier_call = sctp_inet6addr_event,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138};
139
140/* ICMP error handler. */
Daniel Borkmanndda91922013-06-17 11:40:05 +0200141static void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
142 u8 type, u8 code, int offset, __be32 info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143{
144 struct inet6_dev *idev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 struct sock *sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 struct sctp_association *asoc;
147 struct sctp_transport *transport;
148 struct ipv6_pinfo *np;
Simon Horman2c928e02013-06-13 16:04:33 +0900149 __u16 saveip, savesctp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 int err;
Eric W. Biederman4110cc22012-08-06 08:41:13 +0000151 struct net *net = dev_net(skb->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152
153 idev = in6_dev_get(skb->dev);
154
155 /* Fix up skb to look at the embedded net header. */
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700156 saveip = skb->network_header;
157 savesctp = skb->transport_header;
Arnaldo Carvalho de Melo1ced98e2007-03-10 19:57:15 -0300158 skb_reset_network_header(skb);
Arnaldo Carvalho de Meloa27ef742007-03-13 17:17:10 -0300159 skb_set_transport_header(skb, offset);
Eric W. Biederman4110cc22012-08-06 08:41:13 +0000160 sk = sctp_err_lookup(net, AF_INET6, skb, sctp_hdr(skb), &asoc, &transport);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 /* Put back, the original pointers. */
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700162 skb->network_header = saveip;
163 skb->transport_header = savesctp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 if (!sk) {
Eric W. Biedermanb01a2402012-08-06 08:47:55 +0000165 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_INERRORS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 goto out;
167 }
168
169 /* Warning: The sock lock is held. Remember to call
170 * sctp_err_finish!
171 */
172
173 switch (type) {
174 case ICMPV6_PKT_TOOBIG:
Hannes Frederic Sowa790e38b2013-12-19 12:54:58 +0100175 if (ip6_sk_accept_pmtu(sk))
176 sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 goto out_unlock;
178 case ICMPV6_PARAMPROB:
179 if (ICMPV6_UNK_NEXTHDR == code) {
Sridhar Samudralad1ad1ff2005-07-18 13:44:10 -0700180 sctp_icmp_proto_unreachable(sk, asoc, transport);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 goto out_unlock;
182 }
183 break;
David S. Millerec18d9a2012-07-12 00:25:15 -0700184 case NDISC_REDIRECT:
185 sctp_icmp_redirect(sk, transport, skb);
Daniel Borkmann3f96a532013-09-16 12:36:02 +0200186 goto out_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 default:
188 break;
189 }
190
191 np = inet6_sk(sk);
192 icmpv6_err_convert(type, code, &err);
193 if (!sock_owned_by_user(sk) && np->recverr) {
194 sk->sk_err = err;
195 sk->sk_error_report(sk);
196 } else { /* Only an error on timeout */
197 sk->sk_err_soft = err;
198 }
199
200out_unlock:
Sridhar Samudralad1ad1ff2005-07-18 13:44:10 -0700201 sctp_err_finish(sk, asoc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202out:
203 if (likely(idev != NULL))
204 in6_dev_put(idev);
205}
206
Herbert Xuf8803742008-08-03 21:15:08 -0700207static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208{
209 struct sock *sk = skb->sk;
210 struct ipv6_pinfo *np = inet6_sk(sk);
Daniel Borkmann95ee6202013-09-11 16:58:36 +0200211 struct flowi6 *fl6 = &transport->fl.u.ip6;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212
Daniel Borkmannbb333812013-06-28 19:49:40 +0200213 pr_debug("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n", __func__, skb,
Daniel Borkmann95ee6202013-09-11 16:58:36 +0200214 skb->len, &fl6->saddr, &fl6->daddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215
Daniel Borkmann95ee6202013-09-11 16:58:36 +0200216 IP6_ECN_flow_xmit(sk, fl6->flowlabel);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217
Herbert Xuf8803742008-08-03 21:15:08 -0700218 if (!(transport->param_flags & SPP_PMTUD_ENABLE))
219 skb->local_df = 1;
220
Daniel Borkmann95ee6202013-09-11 16:58:36 +0200221 SCTP_INC_STATS(sock_net(sk), SCTP_MIB_OUTSCTPPACKS);
222
223 return ip6_xmit(sk, skb, fl6, np->opt, np->tclass);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224}
225
226/* Returns the dst cache entry for the given source and destination ip
227 * addresses.
228 */
Vlad Yasevichda0420b2011-04-26 21:54:17 +0000229static void sctp_v6_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
230 struct flowi *fl, struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231{
Vlad Yasevichda0420b2011-04-26 21:54:17 +0000232 struct sctp_association *asoc = t->asoc;
Weixing Shi62503412011-04-26 21:36:32 +0000233 struct dst_entry *dst = NULL;
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000234 struct flowi6 *fl6 = &fl->u.ip6;
Weixing Shi62503412011-04-26 21:36:32 +0000235 struct sctp_bind_addr *bp;
Daniel Borkmann95ee6202013-09-11 16:58:36 +0200236 struct ipv6_pinfo *np = inet6_sk(sk);
Weixing Shi62503412011-04-26 21:36:32 +0000237 struct sctp_sockaddr_entry *laddr;
238 union sctp_addr *baddr = NULL;
Vlad Yasevichda0420b2011-04-26 21:54:17 +0000239 union sctp_addr *daddr = &t->ipaddr;
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000240 union sctp_addr dst_saddr;
Daniel Borkmann95ee6202013-09-11 16:58:36 +0200241 struct in6_addr *final_p, final;
Weixing Shi62503412011-04-26 21:36:32 +0000242 __u8 matchlen = 0;
243 __u8 bmatchlen;
244 sctp_scope_t scope;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000246 memset(fl6, 0, sizeof(struct flowi6));
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000247 fl6->daddr = daddr->v6.sin6_addr;
Vlad Yasevich9c6a02f2011-04-26 21:52:27 +0000248 fl6->fl6_dport = daddr->v6.sin6_port;
249 fl6->flowi6_proto = IPPROTO_SCTP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000251 fl6->flowi6_oif = daddr->v6.sin6_scope_id;
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900252
Daniel Borkmannbb333812013-06-28 19:49:40 +0200253 pr_debug("%s: dst=%pI6 ", __func__, &fl6->daddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254
Vlad Yasevich9c6a02f2011-04-26 21:52:27 +0000255 if (asoc)
256 fl6->fl6_sport = htons(asoc->base.bind_addr.port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257
258 if (saddr) {
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000259 fl6->saddr = saddr->v6.sin6_addr;
Vlad Yasevich9c6a02f2011-04-26 21:52:27 +0000260 fl6->fl6_sport = saddr->v6.sin6_port;
Daniel Borkmannbb333812013-06-28 19:49:40 +0200261
262 pr_debug("src=%pI6 - ", &fl6->saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 }
264
Daniel Borkmann95ee6202013-09-11 16:58:36 +0200265 final_p = fl6_update_dst(fl6, np->opt, &final);
Steffen Klassert0e0d44a2013-08-28 08:04:14 +0200266 dst = ip6_dst_lookup_flow(sk, fl6, final_p);
Weixing Shi62503412011-04-26 21:36:32 +0000267 if (!asoc || saddr)
268 goto out;
269
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000270 bp = &asoc->base.bind_addr;
271 scope = sctp_scope(daddr);
272 /* ip6_dst_lookup has filled in the fl6->saddr for us. Check
273 * to see if we can use it.
274 */
Vlad Yasevich9c6a02f2011-04-26 21:52:27 +0000275 if (!IS_ERR(dst)) {
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000276 /* Walk through the bind address list and look for a bind
277 * address that matches the source address of the returned dst.
Weixing Shi62503412011-04-26 21:36:32 +0000278 */
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000279 sctp_v6_to_addr(&dst_saddr, &fl6->saddr, htons(bp->port));
Weixing Shi62503412011-04-26 21:36:32 +0000280 rcu_read_lock();
281 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
Daniel Borkmannfecda032013-10-22 18:34:56 +0200282 if (!laddr->valid || laddr->state == SCTP_ADDR_DEL ||
283 (laddr->state != SCTP_ADDR_SRC &&
284 !asoc->src_out_of_asoc_ok))
Weixing Shi62503412011-04-26 21:36:32 +0000285 continue;
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000286
287 /* Do not compare against v4 addrs */
288 if ((laddr->a.sa.sa_family == AF_INET6) &&
289 (sctp_v6_cmp_addr(&dst_saddr, &laddr->a))) {
290 rcu_read_unlock();
291 goto out;
Weixing Shi62503412011-04-26 21:36:32 +0000292 }
293 }
294 rcu_read_unlock();
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000295 /* None of the bound addresses match the source address of the
296 * dst. So release it.
297 */
298 dst_release(dst);
299 dst = NULL;
300 }
301
302 /* Walk through the bind address list and try to get the
303 * best source address for a given destination.
304 */
305 rcu_read_lock();
306 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
Daniel Borkmanne9c0dfb2013-02-12 13:30:16 +0000307 if (!laddr->valid)
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000308 continue;
Daniel Borkmanne9c0dfb2013-02-12 13:30:16 +0000309 if ((laddr->state == SCTP_ADDR_SRC) &&
310 (laddr->a.sa.sa_family == AF_INET6) &&
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000311 (scope <= sctp_scope(&laddr->a))) {
312 bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a);
313 if (!baddr || (matchlen < bmatchlen)) {
314 baddr = &laddr->a;
315 matchlen = bmatchlen;
316 }
Weixing Shi62503412011-04-26 21:36:32 +0000317 }
318 }
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000319 rcu_read_unlock();
Daniel Borkmann95ee6202013-09-11 16:58:36 +0200320
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000321 if (baddr) {
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000322 fl6->saddr = baddr->v6.sin6_addr;
Vlad Yasevich9c6a02f2011-04-26 21:52:27 +0000323 fl6->fl6_sport = baddr->v6.sin6_port;
Daniel Borkmann95ee6202013-09-11 16:58:36 +0200324 final_p = fl6_update_dst(fl6, np->opt, &final);
Steffen Klassert0e0d44a2013-08-28 08:04:14 +0200325 dst = ip6_dst_lookup_flow(sk, fl6, final_p);
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000326 }
327
Weixing Shi62503412011-04-26 21:36:32 +0000328out:
Tommi Rantalaee3f34e2012-11-29 23:17:42 +0000329 if (!IS_ERR_OR_NULL(dst)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 struct rt6_info *rt;
Daniel Borkmannbb333812013-06-28 19:49:40 +0200331
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 rt = (struct rt6_info *)dst;
Vlad Yasevichda0420b2011-04-26 21:54:17 +0000333 t->dst = dst;
fan.dud27fc782013-08-02 10:45:13 +0800334 t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
Daniel Borkmannbb333812013-06-28 19:49:40 +0200335 pr_debug("rt6_dst:%pI6 rt6_src:%pI6\n", &rt->rt6i_dst.addr,
336 &fl6->saddr);
Vlad Yasevichda0420b2011-04-26 21:54:17 +0000337 } else {
338 t->dst = NULL;
Daniel Borkmannbb333812013-06-28 19:49:40 +0200339
340 pr_debug("no route\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342}
343
344/* Returns the number of consecutive initial bits that match in the 2 ipv6
345 * addresses.
346 */
347static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
348 union sctp_addr *s2)
349{
YOSHIFUJI Hideaki / 吉藤英明de7737e2010-03-26 08:34:30 +0000350 return ipv6_addr_diff(&s1->v6.sin6_addr, &s2->v6.sin6_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351}
352
353/* Fills in the source address(saddr) based on the destination address(daddr)
354 * and asoc's bind address list.
355 */
YOSHIFUJI Hideakie5117102008-05-29 19:55:05 +0900356static void sctp_v6_get_saddr(struct sctp_sock *sk,
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000357 struct sctp_transport *t,
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000358 struct flowi *fl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359{
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000360 struct flowi6 *fl6 = &fl->u.ip6;
361 union sctp_addr *saddr = &t->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362
Daniel Borkmannbb333812013-06-28 19:49:40 +0200363 pr_debug("%s: asoc:%p dst:%p\n", __func__, t->asoc, t->dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000365 if (t->dst) {
366 saddr->v6.sin6_family = AF_INET6;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000367 saddr->v6.sin6_addr = fl6->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369}
370
371/* Make a copy of all potential local addresses. */
372static void sctp_v6_copy_addrlist(struct list_head *addrlist,
373 struct net_device *dev)
374{
375 struct inet6_dev *in6_dev;
376 struct inet6_ifaddr *ifp;
377 struct sctp_sockaddr_entry *addr;
378
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -0700379 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 if ((in6_dev = __in6_dev_get(dev)) == NULL) {
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -0700381 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 return;
383 }
384
Jarek Poplawskie2eb8d42007-03-08 14:43:41 -0800385 read_lock_bh(&in6_dev->lock);
stephen hemminger502a2ff2010-03-17 20:31:13 +0000386 list_for_each_entry(ifp, &in6_dev->addr_list, if_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 /* Add the address to the local list. */
Daniel Borkmann939cfa72013-06-17 11:40:04 +0200388 addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 if (addr) {
Al Viro2a6fd782006-11-20 17:04:42 -0800390 addr->a.v6.sin6_family = AF_INET6;
391 addr->a.v6.sin6_port = 0;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000392 addr->a.v6.sin6_addr = ifp->addr;
Al Viro2a6fd782006-11-20 17:04:42 -0800393 addr->a.v6.sin6_scope_id = dev->ifindex;
Vlad Yasevich29303542007-09-16 16:02:12 -0700394 addr->valid = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 INIT_LIST_HEAD(&addr->list);
396 list_add_tail(&addr->list, addrlist);
397 }
398 }
399
Jarek Poplawskie2eb8d42007-03-08 14:43:41 -0800400 read_unlock_bh(&in6_dev->lock);
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -0700401 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402}
403
404/* Initialize a sockaddr_storage from in incoming skb. */
wangweidongcb3f8372013-12-23 12:16:50 +0800405static void sctp_v6_from_skb(union sctp_addr *addr, struct sk_buff *skb,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 int is_saddr)
407{
Al Virod55c41b2006-11-20 17:09:40 -0800408 __be16 *port;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 struct sctphdr *sh;
410
411 port = &addr->v6.sin6_port;
412 addr->v6.sin6_family = AF_INET6;
413 addr->v6.sin6_flowinfo = 0; /* FIXME */
414 addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif;
415
Arnaldo Carvalho de Melo2c0fd382007-03-13 13:59:32 -0300416 sh = sctp_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 if (is_saddr) {
Al Virod55c41b2006-11-20 17:09:40 -0800418 *port = sh->source;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000419 addr->v6.sin6_addr = ipv6_hdr(skb)->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 } else {
Al Virod55c41b2006-11-20 17:09:40 -0800421 *port = sh->dest;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000422 addr->v6.sin6_addr = ipv6_hdr(skb)->daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424}
425
426/* Initialize an sctp_addr from a socket. */
427static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk)
428{
429 addr->v6.sin6_family = AF_INET6;
Al Viro7dcdbd92006-11-20 17:24:21 -0800430 addr->v6.sin6_port = 0;
Eric Dumazetefe42082013-10-03 15:42:29 -0700431 addr->v6.sin6_addr = sk->sk_v6_rcv_saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432}
433
434/* Initialize sk->sk_rcv_saddr from sctp_addr. */
435static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
436{
437 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
Eric Dumazetefe42082013-10-03 15:42:29 -0700438 sk->sk_v6_rcv_saddr.s6_addr32[0] = 0;
439 sk->sk_v6_rcv_saddr.s6_addr32[1] = 0;
440 sk->sk_v6_rcv_saddr.s6_addr32[2] = htonl(0x0000ffff);
441 sk->sk_v6_rcv_saddr.s6_addr32[3] =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442 addr->v4.sin_addr.s_addr;
443 } else {
Eric Dumazetefe42082013-10-03 15:42:29 -0700444 sk->sk_v6_rcv_saddr = addr->v6.sin6_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 }
446}
447
448/* Initialize sk->sk_daddr from sctp_addr. */
449static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
450{
451 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
Eric Dumazetefe42082013-10-03 15:42:29 -0700452 sk->sk_v6_daddr.s6_addr32[0] = 0;
453 sk->sk_v6_daddr.s6_addr32[1] = 0;
454 sk->sk_v6_daddr.s6_addr32[2] = htonl(0x0000ffff);
455 sk->sk_v6_daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 } else {
Eric Dumazetefe42082013-10-03 15:42:29 -0700457 sk->sk_v6_daddr = addr->v6.sin6_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 }
459}
460
461/* Initialize a sctp_addr from an address parameter. */
462static void sctp_v6_from_addr_param(union sctp_addr *addr,
463 union sctp_addr_param *param,
Al Virodd86d132006-11-20 17:11:13 -0800464 __be16 port, int iif)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465{
466 addr->v6.sin6_family = AF_INET6;
467 addr->v6.sin6_port = port;
468 addr->v6.sin6_flowinfo = 0; /* BUG */
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000469 addr->v6.sin6_addr = param->v6.addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 addr->v6.sin6_scope_id = iif;
471}
472
473/* Initialize an address parameter from a sctp_addr and return the length
474 * of the address parameter.
475 */
476static int sctp_v6_to_addr_param(const union sctp_addr *addr,
477 union sctp_addr_param *param)
478{
479 int length = sizeof(sctp_ipv6addr_param_t);
480
481 param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS;
Al Virodbc16db2006-11-20 17:01:42 -0800482 param->v6.param_hdr.length = htons(length);
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000483 param->v6.addr = addr->v6.sin6_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484
485 return length;
486}
487
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000488/* Initialize a sctp_addr from struct in6_addr. */
489static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr,
Al Viro854d43a2006-11-20 17:06:24 -0800490 __be16 port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492 addr->sa.sa_family = AF_INET6;
493 addr->v6.sin6_port = port;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000494 addr->v6.sin6_addr = *saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495}
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;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000553 const struct in6_addr *in6 = (const struct in6_addr *)&addr->v6.sin6_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554
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
Eric W. Biedermanbb2db452012-08-06 08:46:26 +0000569 return ipv6_chk_addr(sock_net(&sp->inet.sk), 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{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638 struct sock *newsk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
640 struct sctp6_sock *newsctp6sk;
641
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900642 newsk = sk_alloc(sock_net(sk), PF_INET6, GFP_KERNEL, sk->sk_prot);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643 if (!newsk)
644 goto out;
645
646 sock_init_data(NULL, newsk);
647
Vlad Yasevich914e1c82009-02-13 08:33:44 +0000648 sctp_copy_sock(newsk, sk, asoc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649 sock_reset_flag(sk, SOCK_ZAPPED);
650
651 newsctp6sk = (struct sctp6_sock *)newsk;
652 inet_sk(newsk)->pinet6 = &newsctp6sk->inet6;
653
Dave Johnsonb225b882007-07-25 19:49:29 -0400654 sctp_sk(newsk)->v4mapped = sctp_sk(sk)->v4mapped;
655
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656 newnp = inet6_sk(newsk);
657
658 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
659
660 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
661 * and getpeername().
662 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663 sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);
664
Matija Glavinic Pecotic661dbf32014-02-06 08:30:10 +0100665 newsk->sk_v6_rcv_saddr = sk->sk_v6_rcv_saddr;
666
Arnaldo Carvalho de Meloe6848972005-08-09 19:45:38 -0700667 sk_refcnt_debug_inc(newsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668
669 if (newsk->sk_prot->init(newsk)) {
670 sk_common_release(newsk);
671 newsk = NULL;
672 }
673
674out:
675 return newsk;
676}
677
678/* Map v4 address to mapped v6 address */
679static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
680{
681 if (sp->v4mapped && AF_INET == addr->sa.sa_family)
682 sctp_v4_map_v6(addr);
683}
684
685/* Where did this skb come from? */
686static int sctp_v6_skb_iif(const struct sk_buff *skb)
687{
688 struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
689 return opt->iif;
690}
691
692/* Was this packet marked by Explicit Congestion Notification? */
693static int sctp_v6_is_ce(const struct sk_buff *skb)
694{
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700695 return *((__u32 *)(ipv6_hdr(skb))) & htonl(1 << 20);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696}
697
698/* Dump the v6 addr to the seq file. */
699static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
700{
Harvey Harrison5b095d9892008-10-29 12:52:50 -0700701 seq_printf(seq, "%pI6 ", &addr->v6.sin6_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702}
703
Vlad Yasevichb9031d92008-06-04 12:40:15 -0700704static void sctp_v6_ecn_capable(struct sock *sk)
705{
706 inet6_sk(sk)->tclass |= INET_ECN_ECT_0;
707}
708
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709/* Initialize a PF_INET6 socket msg_name. */
710static void sctp_inet6_msgname(char *msgname, int *addr_len)
711{
712 struct sockaddr_in6 *sin6;
713
714 sin6 = (struct sockaddr_in6 *)msgname;
715 sin6->sin6_family = AF_INET6;
716 sin6->sin6_flowinfo = 0;
717 sin6->sin6_scope_id = 0; /*FIXME */
718 *addr_len = sizeof(struct sockaddr_in6);
719}
720
721/* Initialize a PF_INET msgname from a ulpevent. */
722static void sctp_inet6_event_msgname(struct sctp_ulpevent *event,
723 char *msgname, int *addrlen)
724{
725 struct sockaddr_in6 *sin6, *sin6from;
726
727 if (msgname) {
728 union sctp_addr *addr;
729 struct sctp_association *asoc;
730
731 asoc = event->asoc;
732 sctp_inet6_msgname(msgname, addrlen);
733 sin6 = (struct sockaddr_in6 *)msgname;
734 sin6->sin6_port = htons(asoc->peer.port);
735 addr = &asoc->peer.primary_addr;
736
737 /* Note: If we go to a common v6 format, this code
738 * will change.
739 */
740
741 /* Map ipv4 address into v4-mapped-on-v6 address. */
742 if (sctp_sk(asoc->base.sk)->v4mapped &&
743 AF_INET == addr->sa.sa_family) {
744 sctp_v4_map_v6((union sctp_addr *)sin6);
745 sin6->sin6_addr.s6_addr32[3] =
746 addr->v4.sin_addr.s_addr;
747 return;
748 }
749
750 sin6from = &asoc->peer.primary_addr.v6;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000751 sin6->sin6_addr = sin6from->sin6_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
753 sin6->sin6_scope_id = sin6from->sin6_scope_id;
754 }
755}
756
757/* Initialize a msg_name from an inbound skb. */
758static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname,
759 int *addr_len)
760{
761 struct sctphdr *sh;
762 struct sockaddr_in6 *sin6;
763
764 if (msgname) {
765 sctp_inet6_msgname(msgname, addr_len);
766 sin6 = (struct sockaddr_in6 *)msgname;
Arnaldo Carvalho de Melo2c0fd382007-03-13 13:59:32 -0300767 sh = sctp_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768 sin6->sin6_port = sh->source;
769
770 /* Map ipv4 address into v4-mapped-on-v6 address. */
771 if (sctp_sk(skb->sk)->v4mapped &&
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700772 ip_hdr(skb)->version == 4) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773 sctp_v4_map_v6((union sctp_addr *)sin6);
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700774 sin6->sin6_addr.s6_addr32[3] = ip_hdr(skb)->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775 return;
776 }
777
778 /* Otherwise, just copy the v6 address. */
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000779 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) {
781 struct sctp_ulpevent *ev = sctp_skb2event(skb);
782 sin6->sin6_scope_id = ev->iif;
783 }
784 }
785}
786
787/* Do we support this AF? */
788static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp)
789{
790 switch (family) {
791 case AF_INET6:
792 return 1;
793 /* v4-mapped-v6 addresses */
794 case AF_INET:
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700795 if (!__ipv6_only_sock(sctp_opt2sk(sp)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796 return 1;
797 default:
798 return 0;
799 }
800}
801
802/* Address matching with wildcards allowed. This extra level
803 * of indirection lets us choose whether a PF_INET6 should
804 * disallow any v4 addresses if we so choose.
805 */
806static int sctp_inet6_cmp_addr(const union sctp_addr *addr1,
807 const union sctp_addr *addr2,
808 struct sctp_sock *opt)
809{
810 struct sctp_af *af1, *af2;
Vlad Yasevich52cae8f2008-08-18 10:34:34 -0400811 struct sock *sk = sctp_opt2sk(opt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812
813 af1 = sctp_get_af_specific(addr1->sa.sa_family);
814 af2 = sctp_get_af_specific(addr2->sa.sa_family);
815
816 if (!af1 || !af2)
817 return 0;
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700818
819 /* If the socket is IPv6 only, v4 addrs will not match */
Vlad Yasevich52cae8f2008-08-18 10:34:34 -0400820 if (__ipv6_only_sock(sk) && af1 != af2)
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700821 return 0;
822
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823 /* Today, wildcard AF_INET/AF_INET6. */
Vlad Yasevich52cae8f2008-08-18 10:34:34 -0400824 if (sctp_is_any(sk, addr1) || sctp_is_any(sk, addr2))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825 return 1;
826
827 if (addr1->sa.sa_family != addr2->sa.sa_family)
828 return 0;
829
830 return af1->cmp_addr(addr1, addr2);
831}
832
833/* Verify that the provided sockaddr looks bindable. Common verification,
834 * has already been taken care of.
835 */
836static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
837{
838 struct sctp_af *af;
839
840 /* ASSERT: address family has already been verified. */
841 if (addr->sa.sa_family != AF_INET6)
842 af = sctp_get_af_specific(addr->sa.sa_family);
843 else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844 int type = ipv6_addr_type(&addr->v6.sin6_addr);
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700845 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700847 if (type & IPV6_ADDR_LINKLOCAL) {
Eric W. Biedermanbb2db452012-08-06 08:46:26 +0000848 struct net *net;
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700849 if (!addr->v6.sin6_scope_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850 return 0;
Eric W. Biedermanbb2db452012-08-06 08:46:26 +0000851 net = sock_net(&opt->inet.sk);
Eric Dumazet40c9c312009-11-05 20:56:46 -0800852 rcu_read_lock();
Eric W. Biedermanbb2db452012-08-06 08:46:26 +0000853 dev = dev_get_by_index_rcu(net, addr->v6.sin6_scope_id);
Eric Dumazet40c9c312009-11-05 20:56:46 -0800854 if (!dev ||
Eric W. Biedermanbb2db452012-08-06 08:46:26 +0000855 !ipv6_chk_addr(net, &addr->v6.sin6_addr, dev, 0)) {
Eric Dumazet40c9c312009-11-05 20:56:46 -0800856 rcu_read_unlock();
Vlad Yasevich1669d852007-07-03 14:29:23 -0400857 return 0;
858 }
Eric Dumazet40c9c312009-11-05 20:56:46 -0800859 rcu_read_unlock();
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700860 } else if (type == IPV6_ADDR_MAPPED) {
861 if (!opt->v4mapped)
862 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863 }
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700864
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865 af = opt->pf->af;
866 }
867 return af->available(addr, opt);
868}
869
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700870/* Verify that the provided sockaddr looks sendable. Common verification,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871 * has already been taken care of.
872 */
873static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
874{
875 struct sctp_af *af = NULL;
876
877 /* ASSERT: address family has already been verified. */
878 if (addr->sa.sa_family != AF_INET6)
879 af = sctp_get_af_specific(addr->sa.sa_family);
880 else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881 int type = ipv6_addr_type(&addr->v6.sin6_addr);
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700882 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700884 if (type & IPV6_ADDR_LINKLOCAL) {
885 if (!addr->v6.sin6_scope_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886 return 0;
Eric Dumazet40c9c312009-11-05 20:56:46 -0800887 rcu_read_lock();
Eric W. Biedermanbb2db452012-08-06 08:46:26 +0000888 dev = dev_get_by_index_rcu(sock_net(&opt->inet.sk),
Eric Dumazet40c9c312009-11-05 20:56:46 -0800889 addr->v6.sin6_scope_id);
890 rcu_read_unlock();
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700891 if (!dev)
892 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893 }
894 af = opt->pf->af;
895 }
896
897 return af != NULL;
898}
899
900/* Fill in Supported Address Type information for INIT and INIT-ACK
901 * chunks. Note: In the future, we may want to look at sock options
902 * to determine whether a PF_INET6 socket really wants to have IPV4
903 * addresses.
904 * Returns number of addresses supported.
905 */
906static int sctp_inet6_supported_addrs(const struct sctp_sock *opt,
Al Viro3dbe8652006-11-20 17:25:49 -0800907 __be16 *types)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908{
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700909 types[0] = SCTP_PARAM_IPV6_ADDRESS;
910 if (!opt || !ipv6_only_sock(sctp_opt2sk(opt))) {
911 types[1] = SCTP_PARAM_IPV4_ADDRESS;
912 return 2;
913 }
914 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915}
916
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800917static const struct proto_ops inet6_seqpacket_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800918 .family = PF_INET6,
919 .owner = THIS_MODULE,
920 .release = inet6_release,
921 .bind = inet6_bind,
922 .connect = inet_dgram_connect,
923 .socketpair = sock_no_socketpair,
924 .accept = inet_accept,
925 .getname = inet6_getname,
926 .poll = sctp_poll,
927 .ioctl = inet6_ioctl,
928 .listen = sctp_inet_listen,
929 .shutdown = inet_shutdown,
930 .setsockopt = sock_common_setsockopt,
931 .getsockopt = sock_common_getsockopt,
932 .sendmsg = inet_sendmsg,
933 .recvmsg = sock_common_recvmsg,
934 .mmap = sock_no_mmap,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800935#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800936 .compat_setsockopt = compat_sock_common_setsockopt,
937 .compat_getsockopt = compat_sock_common_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800938#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939};
940
941static struct inet_protosw sctpv6_seqpacket_protosw = {
942 .type = SOCK_SEQPACKET,
943 .protocol = IPPROTO_SCTP,
944 .prot = &sctpv6_prot,
945 .ops = &inet6_seqpacket_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700946 .no_check = 0,
947 .flags = SCTP_PROTOSW_FLAG
948};
949static struct inet_protosw sctpv6_stream_protosw = {
950 .type = SOCK_STREAM,
951 .protocol = IPPROTO_SCTP,
952 .prot = &sctpv6_prot,
953 .ops = &inet6_seqpacket_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700954 .no_check = 0,
955 .flags = SCTP_PROTOSW_FLAG,
956};
957
Herbert Xue5bbef22007-10-15 12:50:28 -0700958static int sctp6_rcv(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959{
Herbert Xue5bbef22007-10-15 12:50:28 -0700960 return sctp_rcv(skb) ? -1 : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961}
962
Alexey Dobriyan41135cc2009-09-14 12:22:28 +0000963static const struct inet6_protocol sctpv6_protocol = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964 .handler = sctp6_rcv,
965 .err_handler = sctp_v6_err,
966 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
967};
968
Neil Horman15efbe72008-02-15 09:53:59 -0500969static struct sctp_af sctp_af_inet6 = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800970 .sa_family = AF_INET6,
971 .sctp_xmit = sctp_v6_xmit,
972 .setsockopt = ipv6_setsockopt,
973 .getsockopt = ipv6_getsockopt,
974 .get_dst = sctp_v6_get_dst,
975 .get_saddr = sctp_v6_get_saddr,
976 .copy_addrlist = sctp_v6_copy_addrlist,
977 .from_skb = sctp_v6_from_skb,
978 .from_sk = sctp_v6_from_sk,
979 .to_sk_saddr = sctp_v6_to_sk_saddr,
980 .to_sk_daddr = sctp_v6_to_sk_daddr,
981 .from_addr_param = sctp_v6_from_addr_param,
982 .to_addr_param = sctp_v6_to_addr_param,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800983 .cmp_addr = sctp_v6_cmp_addr,
984 .scope = sctp_v6_scope,
985 .addr_valid = sctp_v6_addr_valid,
986 .inaddr_any = sctp_v6_inaddr_any,
987 .is_any = sctp_v6_is_any,
988 .available = sctp_v6_available,
989 .skb_iif = sctp_v6_skb_iif,
990 .is_ce = sctp_v6_is_ce,
991 .seq_dump_addr = sctp_v6_seq_dump_addr,
Vlad Yasevichb9031d92008-06-04 12:40:15 -0700992 .ecn_capable = sctp_v6_ecn_capable,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800993 .net_header_len = sizeof(struct ipv6hdr),
994 .sockaddr_len = sizeof(struct sockaddr_in6),
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800995#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800996 .compat_setsockopt = compat_ipv6_setsockopt,
997 .compat_getsockopt = compat_ipv6_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800998#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999};
1000
Neil Horman15efbe72008-02-15 09:53:59 -05001001static struct sctp_pf sctp_pf_inet6 = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002 .event_msgname = sctp_inet6_event_msgname,
1003 .skb_msgname = sctp_inet6_skb_msgname,
1004 .af_supported = sctp_inet6_af_supported,
1005 .cmp_addr = sctp_inet6_cmp_addr,
1006 .bind_verify = sctp_inet6_bind_verify,
1007 .send_verify = sctp_inet6_send_verify,
1008 .supported_addrs = sctp_inet6_supported_addrs,
1009 .create_accept_sk = sctp_v6_create_accept_sk,
1010 .addr_v4map = sctp_v6_addr_v4map,
Neil Horman15efbe72008-02-15 09:53:59 -05001011 .af = &sctp_af_inet6,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012};
1013
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001014/* Initialize IPv6 support and register with socket layer. */
Vlad Yasevich270637a2008-03-20 15:17:14 -07001015void sctp_v6_pf_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017 /* Register the SCTP specific PF_INET6 functions. */
Neil Horman15efbe72008-02-15 09:53:59 -05001018 sctp_register_pf(&sctp_pf_inet6, PF_INET6);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019
1020 /* Register the SCTP specific AF_INET6 functions. */
Neil Horman15efbe72008-02-15 09:53:59 -05001021 sctp_register_af(&sctp_af_inet6);
Vlad Yasevich270637a2008-03-20 15:17:14 -07001022}
1023
1024void sctp_v6_pf_exit(void)
1025{
1026 list_del(&sctp_af_inet6.list);
1027}
1028
1029/* Initialize IPv6 support and register with socket layer. */
1030int sctp_v6_protosw_init(void)
1031{
1032 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001034 rc = proto_register(&sctpv6_prot, 1);
1035 if (rc)
1036 return rc;
1037
1038 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
1039 inet6_register_protosw(&sctpv6_seqpacket_protosw);
1040 inet6_register_protosw(&sctpv6_stream_protosw);
1041
1042 return 0;
1043}
1044
Vlad Yasevich270637a2008-03-20 15:17:14 -07001045void sctp_v6_protosw_exit(void)
1046{
1047 inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
1048 inet6_unregister_protosw(&sctpv6_stream_protosw);
1049 proto_unregister(&sctpv6_prot);
1050}
1051
1052
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001053/* Register with inet6 layer. */
1054int sctp_v6_add_protocol(void)
1055{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056 /* Register notifier for inet6 address additions/deletions. */
1057 register_inet6addr_notifier(&sctp_inet6addr_notifier);
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001058
1059 if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0)
1060 return -EAGAIN;
1061
1062 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063}
1064
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001065/* Unregister with inet6 layer. */
1066void sctp_v6_del_protocol(void)
1067{
1068 inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP);
1069 unregister_inet6addr_notifier(&sctp_inet6addr_notifier);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070}