blob: ec529121f38a03c4b3e2317249cd0694fd619d3f [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
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;
Eric Dumazetc836a8b2015-12-02 21:48:14 -0800212 int res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213
Daniel Borkmannbb333812013-06-28 19:49:40 +0200214 pr_debug("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n", __func__, skb,
Daniel Borkmann95ee6202013-09-11 16:58:36 +0200215 skb->len, &fl6->saddr, &fl6->daddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216
Daniel Borkmann95ee6202013-09-11 16:58:36 +0200217 IP6_ECN_flow_xmit(sk, fl6->flowlabel);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218
Herbert Xuf8803742008-08-03 21:15:08 -0700219 if (!(transport->param_flags & SPP_PMTUD_ENABLE))
WANG Cong60ff7462014-05-04 16:39:18 -0700220 skb->ignore_df = 1;
Herbert Xuf8803742008-08-03 21:15:08 -0700221
Daniel Borkmann95ee6202013-09-11 16:58:36 +0200222 SCTP_INC_STATS(sock_net(sk), SCTP_MIB_OUTSCTPPACKS);
223
Eric Dumazetc836a8b2015-12-02 21:48:14 -0800224 rcu_read_lock();
225 res = ip6_xmit(sk, skb, fl6, rcu_dereference(np->opt), np->tclass);
226 rcu_read_unlock();
227 return res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228}
229
230/* Returns the dst cache entry for the given source and destination ip
231 * addresses.
232 */
Vlad Yasevichda0420b2011-04-26 21:54:17 +0000233static void sctp_v6_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
234 struct flowi *fl, struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235{
Vlad Yasevichda0420b2011-04-26 21:54:17 +0000236 struct sctp_association *asoc = t->asoc;
Weixing Shi62503412011-04-26 21:36:32 +0000237 struct dst_entry *dst = NULL;
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000238 struct flowi6 *fl6 = &fl->u.ip6;
Weixing Shi62503412011-04-26 21:36:32 +0000239 struct sctp_bind_addr *bp;
Daniel Borkmann95ee6202013-09-11 16:58:36 +0200240 struct ipv6_pinfo *np = inet6_sk(sk);
Weixing Shi62503412011-04-26 21:36:32 +0000241 struct sctp_sockaddr_entry *laddr;
242 union sctp_addr *baddr = NULL;
Vlad Yasevichda0420b2011-04-26 21:54:17 +0000243 union sctp_addr *daddr = &t->ipaddr;
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000244 union sctp_addr dst_saddr;
Daniel Borkmann95ee6202013-09-11 16:58:36 +0200245 struct in6_addr *final_p, final;
Weixing Shi62503412011-04-26 21:36:32 +0000246 __u8 matchlen = 0;
247 __u8 bmatchlen;
248 sctp_scope_t scope;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000250 memset(fl6, 0, sizeof(struct flowi6));
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000251 fl6->daddr = daddr->v6.sin6_addr;
Vlad Yasevich9c6a02f2011-04-26 21:52:27 +0000252 fl6->fl6_dport = daddr->v6.sin6_port;
253 fl6->flowi6_proto = IPPROTO_SCTP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000255 fl6->flowi6_oif = daddr->v6.sin6_scope_id;
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900256
Daniel Borkmannbb333812013-06-28 19:49:40 +0200257 pr_debug("%s: dst=%pI6 ", __func__, &fl6->daddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258
Vlad Yasevich9c6a02f2011-04-26 21:52:27 +0000259 if (asoc)
260 fl6->fl6_sport = htons(asoc->base.bind_addr.port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261
262 if (saddr) {
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000263 fl6->saddr = saddr->v6.sin6_addr;
Vlad Yasevich9c6a02f2011-04-26 21:52:27 +0000264 fl6->fl6_sport = saddr->v6.sin6_port;
Daniel Borkmannbb333812013-06-28 19:49:40 +0200265
266 pr_debug("src=%pI6 - ", &fl6->saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 }
268
Eric Dumazetc836a8b2015-12-02 21:48:14 -0800269 rcu_read_lock();
270 final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
271 rcu_read_unlock();
272
Steffen Klassert0e0d44a2013-08-28 08:04:14 +0200273 dst = ip6_dst_lookup_flow(sk, fl6, final_p);
Weixing Shi62503412011-04-26 21:36:32 +0000274 if (!asoc || saddr)
275 goto out;
276
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000277 bp = &asoc->base.bind_addr;
278 scope = sctp_scope(daddr);
279 /* ip6_dst_lookup has filled in the fl6->saddr for us. Check
280 * to see if we can use it.
281 */
Vlad Yasevich9c6a02f2011-04-26 21:52:27 +0000282 if (!IS_ERR(dst)) {
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000283 /* Walk through the bind address list and look for a bind
284 * address that matches the source address of the returned dst.
Weixing Shi62503412011-04-26 21:36:32 +0000285 */
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000286 sctp_v6_to_addr(&dst_saddr, &fl6->saddr, htons(bp->port));
Weixing Shi62503412011-04-26 21:36:32 +0000287 rcu_read_lock();
288 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
Daniel Borkmannfecda032013-10-22 18:34:56 +0200289 if (!laddr->valid || laddr->state == SCTP_ADDR_DEL ||
290 (laddr->state != SCTP_ADDR_SRC &&
291 !asoc->src_out_of_asoc_ok))
Weixing Shi62503412011-04-26 21:36:32 +0000292 continue;
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000293
294 /* Do not compare against v4 addrs */
295 if ((laddr->a.sa.sa_family == AF_INET6) &&
296 (sctp_v6_cmp_addr(&dst_saddr, &laddr->a))) {
297 rcu_read_unlock();
298 goto out;
Weixing Shi62503412011-04-26 21:36:32 +0000299 }
300 }
301 rcu_read_unlock();
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000302 /* None of the bound addresses match the source address of the
303 * dst. So release it.
304 */
305 dst_release(dst);
306 dst = NULL;
307 }
308
309 /* Walk through the bind address list and try to get the
310 * best source address for a given destination.
311 */
312 rcu_read_lock();
313 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
Daniel Borkmanne9c0dfb2013-02-12 13:30:16 +0000314 if (!laddr->valid)
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000315 continue;
Daniel Borkmanne9c0dfb2013-02-12 13:30:16 +0000316 if ((laddr->state == SCTP_ADDR_SRC) &&
317 (laddr->a.sa.sa_family == AF_INET6) &&
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000318 (scope <= sctp_scope(&laddr->a))) {
319 bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a);
320 if (!baddr || (matchlen < bmatchlen)) {
321 baddr = &laddr->a;
322 matchlen = bmatchlen;
323 }
Weixing Shi62503412011-04-26 21:36:32 +0000324 }
325 }
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000326 if (baddr) {
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000327 fl6->saddr = baddr->v6.sin6_addr;
Vlad Yasevich9c6a02f2011-04-26 21:52:27 +0000328 fl6->fl6_sport = baddr->v6.sin6_port;
Eric Dumazetc836a8b2015-12-02 21:48:14 -0800329 final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
Steffen Klassert0e0d44a2013-08-28 08:04:14 +0200330 dst = ip6_dst_lookup_flow(sk, fl6, final_p);
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000331 }
Eric Dumazet69ce6482015-12-07 08:25:21 -0800332 rcu_read_unlock();
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000333
Weixing Shi62503412011-04-26 21:36:32 +0000334out:
Tommi Rantalaee3f34e2012-11-29 23:17:42 +0000335 if (!IS_ERR_OR_NULL(dst)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 struct rt6_info *rt;
Daniel Borkmannbb333812013-06-28 19:49:40 +0200337
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 rt = (struct rt6_info *)dst;
Vlad Yasevichda0420b2011-04-26 21:54:17 +0000339 t->dst = dst;
Martin KaFai Laub197df42015-05-22 20:56:01 -0700340 t->dst_cookie = rt6_get_cookie(rt);
Martin KaFai Laufd0273d2015-05-22 20:55:57 -0700341 pr_debug("rt6_dst:%pI6/%d rt6_src:%pI6\n",
342 &rt->rt6i_dst.addr, rt->rt6i_dst.plen,
Daniel Borkmannbb333812013-06-28 19:49:40 +0200343 &fl6->saddr);
Vlad Yasevichda0420b2011-04-26 21:54:17 +0000344 } else {
345 t->dst = NULL;
Daniel Borkmannbb333812013-06-28 19:49:40 +0200346
347 pr_debug("no route\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349}
350
351/* Returns the number of consecutive initial bits that match in the 2 ipv6
352 * addresses.
353 */
354static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
355 union sctp_addr *s2)
356{
YOSHIFUJI Hideaki / 吉藤英明de7737e2010-03-26 08:34:30 +0000357 return ipv6_addr_diff(&s1->v6.sin6_addr, &s2->v6.sin6_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358}
359
360/* Fills in the source address(saddr) based on the destination address(daddr)
361 * and asoc's bind address list.
362 */
YOSHIFUJI Hideakie5117102008-05-29 19:55:05 +0900363static void sctp_v6_get_saddr(struct sctp_sock *sk,
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000364 struct sctp_transport *t,
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000365 struct flowi *fl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366{
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000367 struct flowi6 *fl6 = &fl->u.ip6;
368 union sctp_addr *saddr = &t->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369
Daniel Borkmannbb333812013-06-28 19:49:40 +0200370 pr_debug("%s: asoc:%p dst:%p\n", __func__, t->asoc, t->dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000372 if (t->dst) {
373 saddr->v6.sin6_family = AF_INET6;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000374 saddr->v6.sin6_addr = fl6->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376}
377
378/* Make a copy of all potential local addresses. */
379static void sctp_v6_copy_addrlist(struct list_head *addrlist,
380 struct net_device *dev)
381{
382 struct inet6_dev *in6_dev;
383 struct inet6_ifaddr *ifp;
384 struct sctp_sockaddr_entry *addr;
385
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -0700386 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 if ((in6_dev = __in6_dev_get(dev)) == NULL) {
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -0700388 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 return;
390 }
391
Jarek Poplawskie2eb8d42007-03-08 14:43:41 -0800392 read_lock_bh(&in6_dev->lock);
stephen hemminger502a2ff2010-03-17 20:31:13 +0000393 list_for_each_entry(ifp, &in6_dev->addr_list, if_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 /* Add the address to the local list. */
Daniel Borkmann939cfa72013-06-17 11:40:04 +0200395 addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 if (addr) {
Al Viro2a6fd782006-11-20 17:04:42 -0800397 addr->a.v6.sin6_family = AF_INET6;
398 addr->a.v6.sin6_port = 0;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000399 addr->a.v6.sin6_addr = ifp->addr;
Al Viro2a6fd782006-11-20 17:04:42 -0800400 addr->a.v6.sin6_scope_id = dev->ifindex;
Vlad Yasevich29303542007-09-16 16:02:12 -0700401 addr->valid = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 INIT_LIST_HEAD(&addr->list);
403 list_add_tail(&addr->list, addrlist);
404 }
405 }
406
Jarek Poplawskie2eb8d42007-03-08 14:43:41 -0800407 read_unlock_bh(&in6_dev->lock);
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -0700408 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409}
410
411/* Initialize a sockaddr_storage from in incoming skb. */
wangweidongcb3f8372013-12-23 12:16:50 +0800412static void sctp_v6_from_skb(union sctp_addr *addr, struct sk_buff *skb,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 int is_saddr)
414{
Al Virod55c41b2006-11-20 17:09:40 -0800415 __be16 *port;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 struct sctphdr *sh;
417
418 port = &addr->v6.sin6_port;
419 addr->v6.sin6_family = AF_INET6;
420 addr->v6.sin6_flowinfo = 0; /* FIXME */
421 addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif;
422
Arnaldo Carvalho de Melo2c0fd382007-03-13 13:59:32 -0300423 sh = sctp_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 if (is_saddr) {
Al Virod55c41b2006-11-20 17:09:40 -0800425 *port = sh->source;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000426 addr->v6.sin6_addr = ipv6_hdr(skb)->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 } else {
Al Virod55c41b2006-11-20 17:09:40 -0800428 *port = sh->dest;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000429 addr->v6.sin6_addr = ipv6_hdr(skb)->daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431}
432
433/* Initialize an sctp_addr from a socket. */
434static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk)
435{
436 addr->v6.sin6_family = AF_INET6;
Al Viro7dcdbd92006-11-20 17:24:21 -0800437 addr->v6.sin6_port = 0;
Eric Dumazetefe42082013-10-03 15:42:29 -0700438 addr->v6.sin6_addr = sk->sk_v6_rcv_saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439}
440
441/* Initialize sk->sk_rcv_saddr from sctp_addr. */
442static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
443{
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600444 if (addr->sa.sa_family == AF_INET) {
Eric Dumazetefe42082013-10-03 15:42:29 -0700445 sk->sk_v6_rcv_saddr.s6_addr32[0] = 0;
446 sk->sk_v6_rcv_saddr.s6_addr32[1] = 0;
447 sk->sk_v6_rcv_saddr.s6_addr32[2] = htonl(0x0000ffff);
448 sk->sk_v6_rcv_saddr.s6_addr32[3] =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 addr->v4.sin_addr.s_addr;
450 } else {
Eric Dumazetefe42082013-10-03 15:42:29 -0700451 sk->sk_v6_rcv_saddr = addr->v6.sin6_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 }
453}
454
455/* Initialize sk->sk_daddr from sctp_addr. */
456static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
457{
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600458 if (addr->sa.sa_family == AF_INET) {
Eric Dumazetefe42082013-10-03 15:42:29 -0700459 sk->sk_v6_daddr.s6_addr32[0] = 0;
460 sk->sk_v6_daddr.s6_addr32[1] = 0;
461 sk->sk_v6_daddr.s6_addr32[2] = htonl(0x0000ffff);
462 sk->sk_v6_daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 } else {
Eric Dumazetefe42082013-10-03 15:42:29 -0700464 sk->sk_v6_daddr = addr->v6.sin6_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 }
466}
467
468/* Initialize a sctp_addr from an address parameter. */
469static void sctp_v6_from_addr_param(union sctp_addr *addr,
470 union sctp_addr_param *param,
Al Virodd86d132006-11-20 17:11:13 -0800471 __be16 port, int iif)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472{
473 addr->v6.sin6_family = AF_INET6;
474 addr->v6.sin6_port = port;
475 addr->v6.sin6_flowinfo = 0; /* BUG */
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000476 addr->v6.sin6_addr = param->v6.addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 addr->v6.sin6_scope_id = iif;
478}
479
480/* Initialize an address parameter from a sctp_addr and return the length
481 * of the address parameter.
482 */
483static int sctp_v6_to_addr_param(const union sctp_addr *addr,
484 union sctp_addr_param *param)
485{
486 int length = sizeof(sctp_ipv6addr_param_t);
487
488 param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS;
Al Virodbc16db2006-11-20 17:01:42 -0800489 param->v6.param_hdr.length = htons(length);
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000490 param->v6.addr = addr->v6.sin6_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491
492 return length;
493}
494
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000495/* Initialize a sctp_addr from struct in6_addr. */
496static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr,
Al Viro854d43a2006-11-20 17:06:24 -0800497 __be16 port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 addr->sa.sa_family = AF_INET6;
500 addr->v6.sin6_port = port;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000501 addr->v6.sin6_addr = *saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502}
503
504/* Compare addresses exactly.
505 * v4-mapped-v6 is also in consideration.
506 */
507static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
508 const union sctp_addr *addr2)
509{
510 if (addr1->sa.sa_family != addr2->sa.sa_family) {
511 if (addr1->sa.sa_family == AF_INET &&
512 addr2->sa.sa_family == AF_INET6 &&
Brian Haleye773e4f2007-08-24 23:16:08 -0700513 ipv6_addr_v4mapped(&addr2->v6.sin6_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 if (addr2->v6.sin6_port == addr1->v4.sin_port &&
515 addr2->v6.sin6_addr.s6_addr32[3] ==
516 addr1->v4.sin_addr.s_addr)
517 return 1;
518 }
519 if (addr2->sa.sa_family == AF_INET &&
520 addr1->sa.sa_family == AF_INET6 &&
Brian Haleye773e4f2007-08-24 23:16:08 -0700521 ipv6_addr_v4mapped(&addr1->v6.sin6_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522 if (addr1->v6.sin6_port == addr2->v4.sin_port &&
523 addr1->v6.sin6_addr.s6_addr32[3] ==
524 addr2->v4.sin_addr.s_addr)
525 return 1;
526 }
527 return 0;
528 }
529 if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr))
530 return 0;
531 /* If this is a linklocal address, compare the scope_id. */
532 if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) {
533 if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id &&
534 (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) {
535 return 0;
536 }
537 }
538
539 return 1;
540}
541
542/* Initialize addr struct to INADDR_ANY. */
Al Viro6fbfa9f2006-11-20 17:24:53 -0800543static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544{
545 memset(addr, 0x00, sizeof(union sctp_addr));
546 addr->v6.sin6_family = AF_INET6;
547 addr->v6.sin6_port = port;
548}
549
550/* Is this a wildcard address? */
551static int sctp_v6_is_any(const union sctp_addr *addr)
552{
Brian Haleyb9b9e102005-04-28 11:59:16 -0700553 return ipv6_addr_any(&addr->v6.sin6_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554}
555
556/* Should this be available for binding? */
557static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp)
558{
559 int type;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000560 const struct in6_addr *in6 = (const struct in6_addr *)&addr->v6.sin6_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561
562 type = ipv6_addr_type(in6);
563 if (IPV6_ADDR_ANY == type)
564 return 1;
565 if (type == IPV6_ADDR_MAPPED) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
567 return 0;
568 sctp_v6_map_v4(addr);
569 return sctp_get_af_specific(AF_INET)->available(addr, sp);
570 }
571 if (!(type & IPV6_ADDR_UNICAST))
572 return 0;
573
Eric W. Biedermanbb2db452012-08-06 08:46:26 +0000574 return ipv6_chk_addr(sock_net(&sp->inet.sk), in6, NULL, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575}
576
577/* This function checks if the address is a valid address to be used for
578 * SCTP.
579 *
580 * Output:
581 * Return 0 - If the address is a non-unicast or an illegal address.
582 * Return 1 - If the address is a unicast.
583 */
Vlad Yasevich5636bef2006-06-17 22:55:35 -0700584static int sctp_v6_addr_valid(union sctp_addr *addr,
585 struct sctp_sock *sp,
586 const struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587{
588 int ret = ipv6_addr_type(&addr->v6.sin6_addr);
589
590 /* Support v4-mapped-v6 address. */
591 if (ret == IPV6_ADDR_MAPPED) {
592 /* Note: This routine is used in input, so v4-mapped-v6
593 * are disallowed here when there is no sctp_sock.
594 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
596 return 0;
597 sctp_v6_map_v4(addr);
Vlad Yasevich5636bef2006-06-17 22:55:35 -0700598 return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599 }
600
601 /* Is this a non-unicast address */
602 if (!(ret & IPV6_ADDR_UNICAST))
603 return 0;
604
605 return 1;
606}
607
608/* What is the scope of 'addr'? */
609static sctp_scope_t sctp_v6_scope(union sctp_addr *addr)
610{
611 int v6scope;
612 sctp_scope_t retval;
613
614 /* The IPv6 scope is really a set of bit fields.
615 * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope.
616 */
617
618 v6scope = ipv6_addr_scope(&addr->v6.sin6_addr);
619 switch (v6scope) {
620 case IFA_HOST:
621 retval = SCTP_SCOPE_LOOPBACK;
622 break;
623 case IFA_LINK:
624 retval = SCTP_SCOPE_LINK;
625 break;
626 case IFA_SITE:
627 retval = SCTP_SCOPE_PRIVATE;
628 break;
629 default:
630 retval = SCTP_SCOPE_GLOBAL;
631 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700632 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633
634 return retval;
635}
636
637/* Create and initialize a new sk for the socket to be returned by accept(). */
638static struct sock *sctp_v6_create_accept_sk(struct sock *sk,
639 struct sctp_association *asoc)
640{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 struct sock *newsk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
643 struct sctp6_sock *newsctp6sk;
Eric Dumazet9470e242015-12-09 07:25:06 -0800644 struct ipv6_txoptions *opt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645
Eric W. Biederman11aa9c22015-05-08 21:09:13 -0500646 newsk = sk_alloc(sock_net(sk), PF_INET6, GFP_KERNEL, sk->sk_prot, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647 if (!newsk)
648 goto out;
649
650 sock_init_data(NULL, newsk);
651
Vlad Yasevich914e1c82009-02-13 08:33:44 +0000652 sctp_copy_sock(newsk, sk, asoc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653 sock_reset_flag(sk, SOCK_ZAPPED);
654
655 newsctp6sk = (struct sctp6_sock *)newsk;
656 inet_sk(newsk)->pinet6 = &newsctp6sk->inet6;
657
Dave Johnsonb225b882007-07-25 19:49:29 -0400658 sctp_sk(newsk)->v4mapped = sctp_sk(sk)->v4mapped;
659
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660 newnp = inet6_sk(newsk);
661
662 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
663
Eric Dumazet9470e242015-12-09 07:25:06 -0800664 rcu_read_lock();
665 opt = rcu_dereference(np->opt);
666 if (opt)
667 opt = ipv6_dup_options(newsk, opt);
668 RCU_INIT_POINTER(newnp->opt, opt);
669 rcu_read_unlock();
670
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
672 * and getpeername().
673 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674 sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);
675
Matija Glavinic Pecotic661dbf32014-02-06 08:30:10 +0100676 newsk->sk_v6_rcv_saddr = sk->sk_v6_rcv_saddr;
677
Arnaldo Carvalho de Meloe6848972005-08-09 19:45:38 -0700678 sk_refcnt_debug_inc(newsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679
680 if (newsk->sk_prot->init(newsk)) {
681 sk_common_release(newsk);
682 newsk = NULL;
683 }
684
685out:
686 return newsk;
687}
688
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600689/* Format a sockaddr for return to user space. This makes sure the return is
690 * AF_INET or AF_INET6 depending on the SCTP_I_WANT_MAPPED_V4_ADDR option.
691 */
692static int sctp_v6_addr_to_user(struct sctp_sock *sp, union sctp_addr *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693{
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600694 if (sp->v4mapped) {
695 if (addr->sa.sa_family == AF_INET)
696 sctp_v4_map_v6(addr);
697 } else {
698 if (addr->sa.sa_family == AF_INET6 &&
699 ipv6_addr_v4mapped(&addr->v6.sin6_addr))
700 sctp_v6_map_v4(addr);
701 }
702
703 if (addr->sa.sa_family == AF_INET)
704 return sizeof(struct sockaddr_in);
705 return sizeof(struct sockaddr_in6);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706}
707
708/* Where did this skb come from? */
709static int sctp_v6_skb_iif(const struct sk_buff *skb)
710{
711 struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
712 return opt->iif;
713}
714
715/* Was this packet marked by Explicit Congestion Notification? */
716static int sctp_v6_is_ce(const struct sk_buff *skb)
717{
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700718 return *((__u32 *)(ipv6_hdr(skb))) & htonl(1 << 20);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719}
720
721/* Dump the v6 addr to the seq file. */
722static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
723{
Harvey Harrison5b095d9892008-10-29 12:52:50 -0700724 seq_printf(seq, "%pI6 ", &addr->v6.sin6_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725}
726
Vlad Yasevichb9031d92008-06-04 12:40:15 -0700727static void sctp_v6_ecn_capable(struct sock *sk)
728{
729 inet6_sk(sk)->tclass |= INET_ECN_ECT_0;
730}
731
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732/* Initialize a PF_INET msgname from a ulpevent. */
733static void sctp_inet6_event_msgname(struct sctp_ulpevent *event,
734 char *msgname, int *addrlen)
735{
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600736 union sctp_addr *addr;
737 struct sctp_association *asoc;
738 union sctp_addr *paddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600740 if (!msgname)
741 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600743 addr = (union sctp_addr *)msgname;
744 asoc = event->asoc;
745 paddr = &asoc->peer.primary_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600747 if (paddr->sa.sa_family == AF_INET) {
748 addr->v4.sin_family = AF_INET;
749 addr->v4.sin_port = htons(asoc->peer.port);
750 addr->v4.sin_addr = paddr->v4.sin_addr;
751 } else {
752 addr->v6.sin6_family = AF_INET6;
753 addr->v6.sin6_flowinfo = 0;
754 if (ipv6_addr_type(&paddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
755 addr->v6.sin6_scope_id = paddr->v6.sin6_scope_id;
756 else
757 addr->v6.sin6_scope_id = 0;
758 addr->v6.sin6_port = htons(asoc->peer.port);
759 addr->v6.sin6_addr = paddr->v6.sin6_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760 }
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600761
762 *addrlen = sctp_v6_addr_to_user(sctp_sk(asoc->base.sk), addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763}
764
765/* Initialize a msg_name from an inbound skb. */
766static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname,
767 int *addr_len)
768{
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600769 union sctp_addr *addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770 struct sctphdr *sh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600772 if (!msgname)
773 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600775 addr = (union sctp_addr *)msgname;
776 sh = sctp_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600778 if (ip_hdr(skb)->version == 4) {
779 addr->v4.sin_family = AF_INET;
780 addr->v4.sin_port = sh->source;
781 addr->v4.sin_addr.s_addr = ip_hdr(skb)->saddr;
782 } else {
783 addr->v6.sin6_family = AF_INET6;
784 addr->v6.sin6_flowinfo = 0;
785 addr->v6.sin6_port = sh->source;
786 addr->v6.sin6_addr = ipv6_hdr(skb)->saddr;
787 if (ipv6_addr_type(&addr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788 struct sctp_ulpevent *ev = sctp_skb2event(skb);
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600789 addr->v6.sin6_scope_id = ev->iif;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790 }
791 }
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600792
793 *addr_len = sctp_v6_addr_to_user(sctp_sk(skb->sk), addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794}
795
796/* Do we support this AF? */
797static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp)
798{
799 switch (family) {
800 case AF_INET6:
801 return 1;
802 /* v4-mapped-v6 addresses */
803 case AF_INET:
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700804 if (!__ipv6_only_sock(sctp_opt2sk(sp)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805 return 1;
806 default:
807 return 0;
808 }
809}
810
811/* Address matching with wildcards allowed. This extra level
812 * of indirection lets us choose whether a PF_INET6 should
813 * disallow any v4 addresses if we so choose.
814 */
815static int sctp_inet6_cmp_addr(const union sctp_addr *addr1,
816 const union sctp_addr *addr2,
817 struct sctp_sock *opt)
818{
819 struct sctp_af *af1, *af2;
Vlad Yasevich52cae8f2008-08-18 10:34:34 -0400820 struct sock *sk = sctp_opt2sk(opt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821
822 af1 = sctp_get_af_specific(addr1->sa.sa_family);
823 af2 = sctp_get_af_specific(addr2->sa.sa_family);
824
825 if (!af1 || !af2)
826 return 0;
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700827
828 /* If the socket is IPv6 only, v4 addrs will not match */
Vlad Yasevich52cae8f2008-08-18 10:34:34 -0400829 if (__ipv6_only_sock(sk) && af1 != af2)
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700830 return 0;
831
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832 /* Today, wildcard AF_INET/AF_INET6. */
Vlad Yasevich52cae8f2008-08-18 10:34:34 -0400833 if (sctp_is_any(sk, addr1) || sctp_is_any(sk, addr2))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834 return 1;
835
836 if (addr1->sa.sa_family != addr2->sa.sa_family)
837 return 0;
838
839 return af1->cmp_addr(addr1, addr2);
840}
841
842/* Verify that the provided sockaddr looks bindable. Common verification,
843 * has already been taken care of.
844 */
845static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
846{
847 struct sctp_af *af;
848
849 /* ASSERT: address family has already been verified. */
850 if (addr->sa.sa_family != AF_INET6)
851 af = sctp_get_af_specific(addr->sa.sa_family);
852 else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853 int type = ipv6_addr_type(&addr->v6.sin6_addr);
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700854 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700856 if (type & IPV6_ADDR_LINKLOCAL) {
Eric W. Biedermanbb2db452012-08-06 08:46:26 +0000857 struct net *net;
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700858 if (!addr->v6.sin6_scope_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859 return 0;
Eric W. Biedermanbb2db452012-08-06 08:46:26 +0000860 net = sock_net(&opt->inet.sk);
Eric Dumazet40c9c312009-11-05 20:56:46 -0800861 rcu_read_lock();
Eric W. Biedermanbb2db452012-08-06 08:46:26 +0000862 dev = dev_get_by_index_rcu(net, addr->v6.sin6_scope_id);
Eric Dumazet40c9c312009-11-05 20:56:46 -0800863 if (!dev ||
Eric W. Biedermanbb2db452012-08-06 08:46:26 +0000864 !ipv6_chk_addr(net, &addr->v6.sin6_addr, dev, 0)) {
Eric Dumazet40c9c312009-11-05 20:56:46 -0800865 rcu_read_unlock();
Vlad Yasevich1669d852007-07-03 14:29:23 -0400866 return 0;
867 }
Eric Dumazet40c9c312009-11-05 20:56:46 -0800868 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869 }
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700870
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871 af = opt->pf->af;
872 }
873 return af->available(addr, opt);
874}
875
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700876/* Verify that the provided sockaddr looks sendable. Common verification,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877 * has already been taken care of.
878 */
879static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
880{
881 struct sctp_af *af = NULL;
882
883 /* ASSERT: address family has already been verified. */
884 if (addr->sa.sa_family != AF_INET6)
885 af = sctp_get_af_specific(addr->sa.sa_family);
886 else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887 int type = ipv6_addr_type(&addr->v6.sin6_addr);
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700888 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700890 if (type & IPV6_ADDR_LINKLOCAL) {
891 if (!addr->v6.sin6_scope_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 return 0;
Eric Dumazet40c9c312009-11-05 20:56:46 -0800893 rcu_read_lock();
Eric W. Biedermanbb2db452012-08-06 08:46:26 +0000894 dev = dev_get_by_index_rcu(sock_net(&opt->inet.sk),
Eric Dumazet40c9c312009-11-05 20:56:46 -0800895 addr->v6.sin6_scope_id);
896 rcu_read_unlock();
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700897 if (!dev)
898 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899 }
900 af = opt->pf->af;
901 }
902
903 return af != NULL;
904}
905
906/* Fill in Supported Address Type information for INIT and INIT-ACK
907 * chunks. Note: In the future, we may want to look at sock options
908 * to determine whether a PF_INET6 socket really wants to have IPV4
909 * addresses.
910 * Returns number of addresses supported.
911 */
912static int sctp_inet6_supported_addrs(const struct sctp_sock *opt,
Al Viro3dbe8652006-11-20 17:25:49 -0800913 __be16 *types)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914{
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700915 types[0] = SCTP_PARAM_IPV6_ADDRESS;
916 if (!opt || !ipv6_only_sock(sctp_opt2sk(opt))) {
917 types[1] = SCTP_PARAM_IPV4_ADDRESS;
918 return 2;
919 }
920 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921}
922
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600923/* Handle SCTP_I_WANT_MAPPED_V4_ADDR for getpeername() and getsockname() */
924static int sctp_getname(struct socket *sock, struct sockaddr *uaddr,
925 int *uaddr_len, int peer)
926{
927 int rc;
928
929 rc = inet6_getname(sock, uaddr, uaddr_len, peer);
930
931 if (rc != 0)
932 return rc;
933
934 *uaddr_len = sctp_v6_addr_to_user(sctp_sk(sock->sk),
935 (union sctp_addr *)uaddr);
936
937 return rc;
938}
939
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800940static const struct proto_ops inet6_seqpacket_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800941 .family = PF_INET6,
942 .owner = THIS_MODULE,
943 .release = inet6_release,
944 .bind = inet6_bind,
945 .connect = inet_dgram_connect,
946 .socketpair = sock_no_socketpair,
947 .accept = inet_accept,
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600948 .getname = sctp_getname,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800949 .poll = sctp_poll,
950 .ioctl = inet6_ioctl,
951 .listen = sctp_inet_listen,
952 .shutdown = inet_shutdown,
953 .setsockopt = sock_common_setsockopt,
954 .getsockopt = sock_common_getsockopt,
955 .sendmsg = inet_sendmsg,
956 .recvmsg = sock_common_recvmsg,
957 .mmap = sock_no_mmap,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800958#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800959 .compat_setsockopt = compat_sock_common_setsockopt,
960 .compat_getsockopt = compat_sock_common_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800961#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962};
963
964static struct inet_protosw sctpv6_seqpacket_protosw = {
965 .type = SOCK_SEQPACKET,
966 .protocol = IPPROTO_SCTP,
967 .prot = &sctpv6_prot,
968 .ops = &inet6_seqpacket_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969 .flags = SCTP_PROTOSW_FLAG
970};
971static struct inet_protosw sctpv6_stream_protosw = {
972 .type = SOCK_STREAM,
973 .protocol = IPPROTO_SCTP,
974 .prot = &sctpv6_prot,
975 .ops = &inet6_seqpacket_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976 .flags = SCTP_PROTOSW_FLAG,
977};
978
Herbert Xue5bbef22007-10-15 12:50:28 -0700979static int sctp6_rcv(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980{
Herbert Xue5bbef22007-10-15 12:50:28 -0700981 return sctp_rcv(skb) ? -1 : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982}
983
Alexey Dobriyan41135cc2009-09-14 12:22:28 +0000984static const struct inet6_protocol sctpv6_protocol = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985 .handler = sctp6_rcv,
986 .err_handler = sctp_v6_err,
987 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
988};
989
Neil Horman15efbe72008-02-15 09:53:59 -0500990static struct sctp_af sctp_af_inet6 = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800991 .sa_family = AF_INET6,
992 .sctp_xmit = sctp_v6_xmit,
993 .setsockopt = ipv6_setsockopt,
994 .getsockopt = ipv6_getsockopt,
995 .get_dst = sctp_v6_get_dst,
996 .get_saddr = sctp_v6_get_saddr,
997 .copy_addrlist = sctp_v6_copy_addrlist,
998 .from_skb = sctp_v6_from_skb,
999 .from_sk = sctp_v6_from_sk,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001000 .from_addr_param = sctp_v6_from_addr_param,
1001 .to_addr_param = sctp_v6_to_addr_param,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001002 .cmp_addr = sctp_v6_cmp_addr,
1003 .scope = sctp_v6_scope,
1004 .addr_valid = sctp_v6_addr_valid,
1005 .inaddr_any = sctp_v6_inaddr_any,
1006 .is_any = sctp_v6_is_any,
1007 .available = sctp_v6_available,
1008 .skb_iif = sctp_v6_skb_iif,
1009 .is_ce = sctp_v6_is_ce,
1010 .seq_dump_addr = sctp_v6_seq_dump_addr,
Vlad Yasevichb9031d92008-06-04 12:40:15 -07001011 .ecn_capable = sctp_v6_ecn_capable,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001012 .net_header_len = sizeof(struct ipv6hdr),
1013 .sockaddr_len = sizeof(struct sockaddr_in6),
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001014#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001015 .compat_setsockopt = compat_ipv6_setsockopt,
1016 .compat_getsockopt = compat_ipv6_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001017#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018};
1019
Neil Horman15efbe72008-02-15 09:53:59 -05001020static struct sctp_pf sctp_pf_inet6 = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001021 .event_msgname = sctp_inet6_event_msgname,
1022 .skb_msgname = sctp_inet6_skb_msgname,
1023 .af_supported = sctp_inet6_af_supported,
1024 .cmp_addr = sctp_inet6_cmp_addr,
1025 .bind_verify = sctp_inet6_bind_verify,
1026 .send_verify = sctp_inet6_send_verify,
1027 .supported_addrs = sctp_inet6_supported_addrs,
1028 .create_accept_sk = sctp_v6_create_accept_sk,
Jason Gunthorpe299ee122014-07-30 12:40:53 -06001029 .addr_to_user = sctp_v6_addr_to_user,
1030 .to_sk_saddr = sctp_v6_to_sk_saddr,
1031 .to_sk_daddr = sctp_v6_to_sk_daddr,
Neil Horman15efbe72008-02-15 09:53:59 -05001032 .af = &sctp_af_inet6,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033};
1034
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001035/* Initialize IPv6 support and register with socket layer. */
Vlad Yasevich270637a2008-03-20 15:17:14 -07001036void sctp_v6_pf_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038 /* Register the SCTP specific PF_INET6 functions. */
Neil Horman15efbe72008-02-15 09:53:59 -05001039 sctp_register_pf(&sctp_pf_inet6, PF_INET6);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040
1041 /* Register the SCTP specific AF_INET6 functions. */
Neil Horman15efbe72008-02-15 09:53:59 -05001042 sctp_register_af(&sctp_af_inet6);
Vlad Yasevich270637a2008-03-20 15:17:14 -07001043}
1044
1045void sctp_v6_pf_exit(void)
1046{
1047 list_del(&sctp_af_inet6.list);
1048}
1049
1050/* Initialize IPv6 support and register with socket layer. */
1051int sctp_v6_protosw_init(void)
1052{
1053 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001055 rc = proto_register(&sctpv6_prot, 1);
1056 if (rc)
1057 return rc;
1058
1059 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
1060 inet6_register_protosw(&sctpv6_seqpacket_protosw);
1061 inet6_register_protosw(&sctpv6_stream_protosw);
1062
1063 return 0;
1064}
1065
Vlad Yasevich270637a2008-03-20 15:17:14 -07001066void sctp_v6_protosw_exit(void)
1067{
1068 inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
1069 inet6_unregister_protosw(&sctpv6_stream_protosw);
1070 proto_unregister(&sctpv6_prot);
1071}
1072
1073
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001074/* Register with inet6 layer. */
1075int sctp_v6_add_protocol(void)
1076{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077 /* Register notifier for inet6 address additions/deletions. */
1078 register_inet6addr_notifier(&sctp_inet6addr_notifier);
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001079
1080 if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0)
1081 return -EAGAIN;
1082
1083 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084}
1085
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001086/* Unregister with inet6 layer. */
1087void sctp_v6_del_protocol(void)
1088{
1089 inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP);
1090 unregister_inet6addr_notifier(&sctp_inet6addr_notifier);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001091}