blob: bc734cfaa29eb6acf2b09d641fc6b740595bfcec [file] [log] [blame]
Thomas Gleixner47505b82019-05-23 11:14:41 +02001// SPDX-License-Identifier: GPL-2.0-or-later
Vlad Yasevich60c778b2008-01-11 09:57:09 -05002/* SCTP kernel implementation
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 * (C) Copyright IBM Corp. 2002, 2004
4 * Copyright (c) 2001 Nokia, Inc.
5 * Copyright (c) 2001 La Monte H.P. Yarroll
6 * Copyright (c) 2002-2003 Intel Corp.
7 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -05008 * This file is part of the SCTP kernel implementation
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 *
10 * SCTP over IPv6.
11 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070012 * Please send any bug reports or fixes you make to the
13 * email address(es):
Daniel Borkmann91705c62013-07-23 14:51:47 +020014 * lksctp developers <linux-sctp@vger.kernel.org>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070016 * Written or modified by:
17 * Le Yanqun <yanqun.le@nokia.com>
18 * Hui Huang <hui.huang@nokia.com>
19 * La Monte H.P. Yarroll <piggy@acm.org>
20 * Sridhar Samudrala <sri@us.ibm.com>
21 * Jon Grimm <jgrimm@us.ibm.com>
22 * Ardelle Fan <ardelle.fan@intel.com>
23 *
24 * Based on:
25 * linux/net/ipv6/tcp_ipv6.c
Linus Torvalds1da177e2005-04-16 15:20:36 -070026 */
27
Joe Perches145ce502010-08-24 13:21:08 +000028#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
29
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include <linux/module.h>
31#include <linux/errno.h>
32#include <linux/types.h>
33#include <linux/socket.h>
34#include <linux/sockios.h>
35#include <linux/net.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include <linux/in.h>
37#include <linux/in6.h>
38#include <linux/netdevice.h>
39#include <linux/init.h>
40#include <linux/ipsec.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090041#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070042
43#include <linux/ipv6.h>
44#include <linux/icmpv6.h>
45#include <linux/random.h>
46#include <linux/seq_file.h>
47
48#include <net/protocol.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070049#include <net/ndisc.h>
Arnaldo Carvalho de Meloc752f072005-08-09 20:08:28 -070050#include <net/ip.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070051#include <net/ipv6.h>
52#include <net/transp_v6.h>
53#include <net/addrconf.h>
54#include <net/ip6_route.h>
55#include <net/inet_common.h>
56#include <net/inet_ecn.h>
57#include <net/sctp/sctp.h>
58
Linus Torvalds7c0f6ba2016-12-24 11:46:01 -080059#include <linux/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070060
Weixing Shi62503412011-04-26 21:36:32 +000061static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
62 union sctp_addr *s2);
Vlad Yasevich9914ae32011-04-26 21:51:31 +000063static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr,
64 __be16 port);
65static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
66 const union sctp_addr *addr2);
Weixing Shi62503412011-04-26 21:36:32 +000067
Vlad Yasevich29303542007-09-16 16:02:12 -070068/* Event handler for inet6 address addition/deletion events.
69 * The sctp_local_addr_list needs to be protocted by a spin lock since
70 * multiple notifiers (say IPv4 and IPv6) may be running at the same
71 * time and thus corrupt the list.
72 * The reader side is protected with RCU.
73 */
Adrian Bunk24123182006-12-20 16:08:22 -080074static int sctp_inet6addr_event(struct notifier_block *this, unsigned long ev,
75 void *ptr)
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -080076{
77 struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
Vlad Yasevich29303542007-09-16 16:02:12 -070078 struct sctp_sockaddr_entry *addr = NULL;
79 struct sctp_sockaddr_entry *temp;
Eric W. Biederman4db67e82012-08-06 08:42:04 +000080 struct net *net = dev_net(ifa->idev->dev);
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -070081 int found = 0;
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -080082
83 switch (ev) {
84 case NETDEV_UP:
Xin Long400b8b92019-01-14 18:34:02 +080085 addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -080086 if (addr) {
87 addr->a.v6.sin6_family = AF_INET6;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +000088 addr->a.v6.sin6_addr = ifa->addr;
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -080089 addr->a.v6.sin6_scope_id = ifa->idev->dev->ifindex;
Vlad Yasevich29303542007-09-16 16:02:12 -070090 addr->valid = 1;
Eric W. Biederman4db67e82012-08-06 08:42:04 +000091 spin_lock_bh(&net->sctp.local_addr_lock);
92 list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
93 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
94 spin_unlock_bh(&net->sctp.local_addr_lock);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -080095 }
96 break;
97 case NETDEV_DOWN:
Eric W. Biederman4db67e82012-08-06 08:42:04 +000098 spin_lock_bh(&net->sctp.local_addr_lock);
Vlad Yasevich29303542007-09-16 16:02:12 -070099 list_for_each_entry_safe(addr, temp,
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000100 &net->sctp.local_addr_list, list) {
Pavel Emelyanova40a7d12008-04-12 18:40:38 -0700101 if (addr->a.sa.sa_family == AF_INET6 &&
102 ipv6_addr_equal(&addr->a.v6.sin6_addr,
103 &ifa->addr)) {
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000104 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -0700105 found = 1;
Vlad Yasevich29303542007-09-16 16:02:12 -0700106 addr->valid = 0;
107 list_del_rcu(&addr->list);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800108 break;
109 }
110 }
Eric W. Biederman4db67e82012-08-06 08:42:04 +0000111 spin_unlock_bh(&net->sctp.local_addr_lock);
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -0700112 if (found)
Lai Jiangshan1231f0b2011-03-15 18:05:02 +0800113 kfree_rcu(addr, rcu);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800114 break;
115 }
116
117 return NOTIFY_DONE;
118}
119
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120static struct notifier_block sctp_inet6addr_notifier = {
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800121 .notifier_call = sctp_inet6addr_event,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122};
123
124/* ICMP error handler. */
Stefano Brivio32bbd872018-11-08 12:19:21 +0100125static int sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Daniel Borkmanndda91922013-06-17 11:40:05 +0200126 u8 type, u8 code, int offset, __be32 info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127{
128 struct inet6_dev *idev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 struct sock *sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 struct sctp_association *asoc;
131 struct sctp_transport *transport;
132 struct ipv6_pinfo *np;
Simon Horman2c928e02013-06-13 16:04:33 +0900133 __u16 saveip, savesctp;
Stefano Brivio32bbd872018-11-08 12:19:21 +0100134 int err, ret = 0;
Eric W. Biederman4110cc22012-08-06 08:41:13 +0000135 struct net *net = dev_net(skb->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136
137 idev = in6_dev_get(skb->dev);
138
139 /* Fix up skb to look at the embedded net header. */
Arnaldo Carvalho de Melob0e380b12007-04-10 21:21:55 -0700140 saveip = skb->network_header;
141 savesctp = skb->transport_header;
Arnaldo Carvalho de Melo1ced98e2007-03-10 19:57:15 -0300142 skb_reset_network_header(skb);
Arnaldo Carvalho de Meloa27ef742007-03-13 17:17:10 -0300143 skb_set_transport_header(skb, offset);
Eric W. Biederman4110cc22012-08-06 08:41:13 +0000144 sk = sctp_err_lookup(net, AF_INET6, skb, sctp_hdr(skb), &asoc, &transport);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 /* Put back, the original pointers. */
Arnaldo Carvalho de Melob0e380b12007-04-10 21:21:55 -0700146 skb->network_header = saveip;
147 skb->transport_header = savesctp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 if (!sk) {
Eric Dumazeta16292a2016-04-27 16:44:36 -0700149 __ICMP6_INC_STATS(net, idev, ICMP6_MIB_INERRORS);
Stefano Brivio32bbd872018-11-08 12:19:21 +0100150 ret = -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 goto out;
152 }
153
154 /* Warning: The sock lock is held. Remember to call
155 * sctp_err_finish!
156 */
157
158 switch (type) {
159 case ICMPV6_PKT_TOOBIG:
Hannes Frederic Sowa790e38b2013-12-19 12:54:58 +0100160 if (ip6_sk_accept_pmtu(sk))
161 sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 goto out_unlock;
163 case ICMPV6_PARAMPROB:
164 if (ICMPV6_UNK_NEXTHDR == code) {
Sridhar Samudralad1ad1ff2005-07-18 13:44:10 -0700165 sctp_icmp_proto_unreachable(sk, asoc, transport);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 goto out_unlock;
167 }
168 break;
David S. Millerec18d9a2012-07-12 00:25:15 -0700169 case NDISC_REDIRECT:
170 sctp_icmp_redirect(sk, transport, skb);
Daniel Borkmann3f96a532013-09-16 12:36:02 +0200171 goto out_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 default:
173 break;
174 }
175
176 np = inet6_sk(sk);
177 icmpv6_err_convert(type, code, &err);
178 if (!sock_owned_by_user(sk) && np->recverr) {
179 sk->sk_err = err;
180 sk->sk_error_report(sk);
181 } else { /* Only an error on timeout */
182 sk->sk_err_soft = err;
183 }
184
185out_unlock:
Xin Longdae399d2016-10-31 20:32:33 +0800186 sctp_err_finish(sk, transport);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187out:
188 if (likely(idev != NULL))
189 in6_dev_put(idev);
Stefano Brivio32bbd872018-11-08 12:19:21 +0100190
191 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192}
193
Herbert Xuf8803742008-08-03 21:15:08 -0700194static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195{
196 struct sock *sk = skb->sk;
197 struct ipv6_pinfo *np = inet6_sk(sk);
Daniel Borkmann95ee6202013-09-11 16:58:36 +0200198 struct flowi6 *fl6 = &transport->fl.u.ip6;
Xin Long8a9c58d2018-07-02 18:21:12 +0800199 __u8 tclass = np->tclass;
Eric Dumazetc836a8b2015-12-02 21:48:14 -0800200 int res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201
Daniel Borkmannbb333812013-06-28 19:49:40 +0200202 pr_debug("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n", __func__, skb,
Daniel Borkmann95ee6202013-09-11 16:58:36 +0200203 skb->len, &fl6->saddr, &fl6->daddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204
Xin Long8a9c58d2018-07-02 18:21:12 +0800205 if (transport->dscp & SCTP_DSCP_SET_MASK)
206 tclass = transport->dscp & SCTP_DSCP_VAL_MASK;
207
208 if (INET_ECN_is_capable(tclass))
209 IP6_ECN_flow_xmit(sk, fl6->flowlabel);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210
Herbert Xuf8803742008-08-03 21:15:08 -0700211 if (!(transport->param_flags & SPP_PMTUD_ENABLE))
WANG Cong60ff7462014-05-04 16:39:18 -0700212 skb->ignore_df = 1;
Herbert Xuf8803742008-08-03 21:15:08 -0700213
Daniel Borkmann95ee6202013-09-11 16:58:36 +0200214 SCTP_INC_STATS(sock_net(sk), SCTP_MIB_OUTSCTPPACKS);
215
Eric Dumazetc836a8b2015-12-02 21:48:14 -0800216 rcu_read_lock();
Pablo Neira92e55f42017-01-26 22:56:21 +0100217 res = ip6_xmit(sk, skb, fl6, sk->sk_mark, rcu_dereference(np->opt),
Eric Dumazet4f6570d2019-09-24 08:01:14 -0700218 tclass, sk->sk_priority);
Eric Dumazetc836a8b2015-12-02 21:48:14 -0800219 rcu_read_unlock();
220 return res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221}
222
223/* Returns the dst cache entry for the given source and destination ip
224 * addresses.
225 */
Vlad Yasevichda0420b2011-04-26 21:54:17 +0000226static void sctp_v6_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
227 struct flowi *fl, struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228{
Vlad Yasevichda0420b2011-04-26 21:54:17 +0000229 struct sctp_association *asoc = t->asoc;
Weixing Shi62503412011-04-26 21:36:32 +0000230 struct dst_entry *dst = NULL;
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000231 struct flowi6 *fl6 = &fl->u.ip6;
Weixing Shi62503412011-04-26 21:36:32 +0000232 struct sctp_bind_addr *bp;
Daniel Borkmann95ee6202013-09-11 16:58:36 +0200233 struct ipv6_pinfo *np = inet6_sk(sk);
Weixing Shi62503412011-04-26 21:36:32 +0000234 struct sctp_sockaddr_entry *laddr;
Vlad Yasevichda0420b2011-04-26 21:54:17 +0000235 union sctp_addr *daddr = &t->ipaddr;
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000236 union sctp_addr dst_saddr;
Daniel Borkmann95ee6202013-09-11 16:58:36 +0200237 struct in6_addr *final_p, final;
Xin Long1c662012017-08-05 19:59:54 +0800238 enum sctp_scope scope;
Weixing Shi62503412011-04-26 21:36:32 +0000239 __u8 matchlen = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000241 memset(fl6, 0, sizeof(struct flowi6));
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000242 fl6->daddr = daddr->v6.sin6_addr;
Vlad Yasevich9c6a02f2011-04-26 21:52:27 +0000243 fl6->fl6_dport = daddr->v6.sin6_port;
244 fl6->flowi6_proto = IPPROTO_SCTP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000246 fl6->flowi6_oif = daddr->v6.sin6_scope_id;
Zheng Li25e7f2d2017-07-06 15:00:09 +0800247 else if (asoc)
248 fl6->flowi6_oif = asoc->base.sk->sk_bound_dev_if;
Xin Long8a9c58d2018-07-02 18:21:12 +0800249 if (t->flowlabel & SCTP_FLOWLABEL_SET_MASK)
250 fl6->flowlabel = htonl(t->flowlabel & SCTP_FLOWLABEL_VAL_MASK);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900251
Xin Long0999f022018-07-02 18:21:15 +0800252 if (np->sndflow && (fl6->flowlabel & IPV6_FLOWLABEL_MASK)) {
253 struct ip6_flowlabel *flowlabel;
254
255 flowlabel = fl6_sock_lookup(sk, fl6->flowlabel);
Willem de Bruijn59c820b2019-07-07 05:34:45 -0400256 if (IS_ERR(flowlabel))
Xin Long0999f022018-07-02 18:21:15 +0800257 goto out;
258 fl6_sock_release(flowlabel);
259 }
260
Daniel Borkmannbb333812013-06-28 19:49:40 +0200261 pr_debug("%s: dst=%pI6 ", __func__, &fl6->daddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262
Vlad Yasevich9c6a02f2011-04-26 21:52:27 +0000263 if (asoc)
264 fl6->fl6_sport = htons(asoc->base.bind_addr.port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265
266 if (saddr) {
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000267 fl6->saddr = saddr->v6.sin6_addr;
Xin Longecf938f2019-01-22 02:42:41 +0800268 if (!fl6->fl6_sport)
269 fl6->fl6_sport = saddr->v6.sin6_port;
Daniel Borkmannbb333812013-06-28 19:49:40 +0200270
271 pr_debug("src=%pI6 - ", &fl6->saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 }
273
Eric Dumazetc836a8b2015-12-02 21:48:14 -0800274 rcu_read_lock();
275 final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
276 rcu_read_unlock();
277
Sabrina Dubrocac4e85f72019-12-04 15:35:52 +0100278 dst = ip6_dst_lookup_flow(sock_net(sk), sk, fl6, final_p);
Weixing Shi62503412011-04-26 21:36:32 +0000279 if (!asoc || saddr)
280 goto out;
281
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000282 bp = &asoc->base.bind_addr;
283 scope = sctp_scope(daddr);
284 /* ip6_dst_lookup has filled in the fl6->saddr for us. Check
285 * to see if we can use it.
286 */
Vlad Yasevich9c6a02f2011-04-26 21:52:27 +0000287 if (!IS_ERR(dst)) {
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000288 /* Walk through the bind address list and look for a bind
289 * address that matches the source address of the returned dst.
Weixing Shi62503412011-04-26 21:36:32 +0000290 */
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000291 sctp_v6_to_addr(&dst_saddr, &fl6->saddr, htons(bp->port));
Weixing Shi62503412011-04-26 21:36:32 +0000292 rcu_read_lock();
293 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
Daniel Borkmannfecda032013-10-22 18:34:56 +0200294 if (!laddr->valid || laddr->state == SCTP_ADDR_DEL ||
295 (laddr->state != SCTP_ADDR_SRC &&
296 !asoc->src_out_of_asoc_ok))
Weixing Shi62503412011-04-26 21:36:32 +0000297 continue;
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000298
299 /* Do not compare against v4 addrs */
300 if ((laddr->a.sa.sa_family == AF_INET6) &&
301 (sctp_v6_cmp_addr(&dst_saddr, &laddr->a))) {
302 rcu_read_unlock();
303 goto out;
Weixing Shi62503412011-04-26 21:36:32 +0000304 }
305 }
306 rcu_read_unlock();
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000307 /* None of the bound addresses match the source address of the
308 * dst. So release it.
309 */
310 dst_release(dst);
311 dst = NULL;
312 }
313
314 /* Walk through the bind address list and try to get the
315 * best source address for a given destination.
316 */
317 rcu_read_lock();
318 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
Xin Longdbc2b5e2017-05-12 14:39:52 +0800319 struct dst_entry *bdst;
320 __u8 bmatchlen;
321
322 if (!laddr->valid ||
323 laddr->state != SCTP_ADDR_SRC ||
324 laddr->a.sa.sa_family != AF_INET6 ||
325 scope > sctp_scope(&laddr->a))
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000326 continue;
Xin Longdbc2b5e2017-05-12 14:39:52 +0800327
328 fl6->saddr = laddr->a.v6.sin6_addr;
329 fl6->fl6_sport = laddr->a.v6.sin6_port;
Eric Dumazetc836a8b2015-12-02 21:48:14 -0800330 final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
Sabrina Dubrocac4e85f72019-12-04 15:35:52 +0100331 bdst = ip6_dst_lookup_flow(sock_net(sk), sk, fl6, final_p);
Xin Longdbc2b5e2017-05-12 14:39:52 +0800332
Alexey Kodanev957d7612018-02-05 15:10:35 +0300333 if (IS_ERR(bdst))
334 continue;
335
336 if (ipv6_chk_addr(dev_net(bdst->dev),
Xin Longdbc2b5e2017-05-12 14:39:52 +0800337 &laddr->a.v6.sin6_addr, bdst->dev, 1)) {
338 if (!IS_ERR_OR_NULL(dst))
339 dst_release(dst);
340 dst = bdst;
341 break;
342 }
343
344 bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a);
Alexey Kodanev957d7612018-02-05 15:10:35 +0300345 if (matchlen > bmatchlen) {
346 dst_release(bdst);
Xin Longdbc2b5e2017-05-12 14:39:52 +0800347 continue;
Alexey Kodanev957d7612018-02-05 15:10:35 +0300348 }
Xin Longdbc2b5e2017-05-12 14:39:52 +0800349
350 if (!IS_ERR_OR_NULL(dst))
351 dst_release(dst);
352 dst = bdst;
353 matchlen = bmatchlen;
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000354 }
Eric Dumazet69ce6482015-12-07 08:25:21 -0800355 rcu_read_unlock();
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000356
Weixing Shi62503412011-04-26 21:36:32 +0000357out:
Tommi Rantalaee3f34e2012-11-29 23:17:42 +0000358 if (!IS_ERR_OR_NULL(dst)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 struct rt6_info *rt;
Daniel Borkmannbb333812013-06-28 19:49:40 +0200360
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 rt = (struct rt6_info *)dst;
Vlad Yasevichda0420b2011-04-26 21:54:17 +0000362 t->dst = dst;
Martin KaFai Laub197df42015-05-22 20:56:01 -0700363 t->dst_cookie = rt6_get_cookie(rt);
Martin KaFai Laufd0273d2015-05-22 20:55:57 -0700364 pr_debug("rt6_dst:%pI6/%d rt6_src:%pI6\n",
365 &rt->rt6i_dst.addr, rt->rt6i_dst.plen,
Daniel Borkmannbb333812013-06-28 19:49:40 +0200366 &fl6->saddr);
Vlad Yasevichda0420b2011-04-26 21:54:17 +0000367 } else {
368 t->dst = NULL;
Daniel Borkmannbb333812013-06-28 19:49:40 +0200369
370 pr_debug("no route\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372}
373
374/* Returns the number of consecutive initial bits that match in the 2 ipv6
375 * addresses.
376 */
377static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
378 union sctp_addr *s2)
379{
YOSHIFUJI Hideaki / 吉藤英明de7737e2010-03-26 08:34:30 +0000380 return ipv6_addr_diff(&s1->v6.sin6_addr, &s2->v6.sin6_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381}
382
383/* Fills in the source address(saddr) based on the destination address(daddr)
384 * and asoc's bind address list.
385 */
YOSHIFUJI Hideakie5117102008-05-29 19:55:05 +0900386static void sctp_v6_get_saddr(struct sctp_sock *sk,
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000387 struct sctp_transport *t,
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000388 struct flowi *fl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389{
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000390 struct flowi6 *fl6 = &fl->u.ip6;
391 union sctp_addr *saddr = &t->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392
Daniel Borkmannbb333812013-06-28 19:49:40 +0200393 pr_debug("%s: asoc:%p dst:%p\n", __func__, t->asoc, t->dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000395 if (t->dst) {
396 saddr->v6.sin6_family = AF_INET6;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000397 saddr->v6.sin6_addr = fl6->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399}
400
401/* Make a copy of all potential local addresses. */
402static void sctp_v6_copy_addrlist(struct list_head *addrlist,
403 struct net_device *dev)
404{
405 struct inet6_dev *in6_dev;
406 struct inet6_ifaddr *ifp;
407 struct sctp_sockaddr_entry *addr;
408
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -0700409 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 if ((in6_dev = __in6_dev_get(dev)) == NULL) {
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -0700411 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 return;
413 }
414
Jarek Poplawskie2eb8d42007-03-08 14:43:41 -0800415 read_lock_bh(&in6_dev->lock);
stephen hemminger502a2ff2010-03-17 20:31:13 +0000416 list_for_each_entry(ifp, &in6_dev->addr_list, if_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 /* Add the address to the local list. */
Daniel Borkmann939cfa72013-06-17 11:40:04 +0200418 addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 if (addr) {
Al Viro2a6fd782006-11-20 17:04:42 -0800420 addr->a.v6.sin6_family = AF_INET6;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000421 addr->a.v6.sin6_addr = ifp->addr;
Al Viro2a6fd782006-11-20 17:04:42 -0800422 addr->a.v6.sin6_scope_id = dev->ifindex;
Vlad Yasevich29303542007-09-16 16:02:12 -0700423 addr->valid = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 INIT_LIST_HEAD(&addr->list);
425 list_add_tail(&addr->list, addrlist);
426 }
427 }
428
Jarek Poplawskie2eb8d42007-03-08 14:43:41 -0800429 read_unlock_bh(&in6_dev->lock);
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -0700430 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431}
432
Richard Hainesb7e10c22018-02-24 16:18:51 +0000433/* Copy over any ip options */
434static void sctp_v6_copy_ip_options(struct sock *sk, struct sock *newsk)
435{
436 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
437 struct ipv6_txoptions *opt;
438
439 newnp = inet6_sk(newsk);
440
441 rcu_read_lock();
442 opt = rcu_dereference(np->opt);
443 if (opt) {
444 opt = ipv6_dup_options(newsk, opt);
445 if (!opt)
446 pr_err("%s: Failed to copy ip options\n", __func__);
447 }
448 RCU_INIT_POINTER(newnp->opt, opt);
449 rcu_read_unlock();
450}
451
452/* Account for the IP options */
453static int sctp_v6_ip_options_len(struct sock *sk)
454{
455 struct ipv6_pinfo *np = inet6_sk(sk);
456 struct ipv6_txoptions *opt;
457 int len = 0;
458
459 rcu_read_lock();
460 opt = rcu_dereference(np->opt);
461 if (opt)
462 len = opt->opt_flen + opt->opt_nflen;
463
464 rcu_read_unlock();
465 return len;
466}
467
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468/* Initialize a sockaddr_storage from in incoming skb. */
wangweidongcb3f8372013-12-23 12:16:50 +0800469static void sctp_v6_from_skb(union sctp_addr *addr, struct sk_buff *skb,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 int is_saddr)
471{
Marcelo Ricardo Leitner0630c562016-12-28 09:26:33 -0200472 /* Always called on head skb, so this is safe */
473 struct sctphdr *sh = sctp_hdr(skb);
474 struct sockaddr_in6 *sa = &addr->v6;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 addr->v6.sin6_family = AF_INET6;
477 addr->v6.sin6_flowinfo = 0; /* FIXME */
478 addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif;
479
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 if (is_saddr) {
Marcelo Ricardo Leitner0630c562016-12-28 09:26:33 -0200481 sa->sin6_port = sh->source;
482 sa->sin6_addr = ipv6_hdr(skb)->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 } else {
Marcelo Ricardo Leitner0630c562016-12-28 09:26:33 -0200484 sa->sin6_port = sh->dest;
485 sa->sin6_addr = ipv6_hdr(skb)->daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487}
488
489/* Initialize an sctp_addr from a socket. */
490static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk)
491{
492 addr->v6.sin6_family = AF_INET6;
Al Viro7dcdbd92006-11-20 17:24:21 -0800493 addr->v6.sin6_port = 0;
Eric Dumazetefe42082013-10-03 15:42:29 -0700494 addr->v6.sin6_addr = sk->sk_v6_rcv_saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495}
496
497/* Initialize sk->sk_rcv_saddr from sctp_addr. */
498static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
499{
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600500 if (addr->sa.sa_family == AF_INET) {
Eric Dumazetefe42082013-10-03 15:42:29 -0700501 sk->sk_v6_rcv_saddr.s6_addr32[0] = 0;
502 sk->sk_v6_rcv_saddr.s6_addr32[1] = 0;
503 sk->sk_v6_rcv_saddr.s6_addr32[2] = htonl(0x0000ffff);
504 sk->sk_v6_rcv_saddr.s6_addr32[3] =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 addr->v4.sin_addr.s_addr;
506 } else {
Eric Dumazetefe42082013-10-03 15:42:29 -0700507 sk->sk_v6_rcv_saddr = addr->v6.sin6_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 }
509}
510
511/* Initialize sk->sk_daddr from sctp_addr. */
512static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
513{
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600514 if (addr->sa.sa_family == AF_INET) {
Eric Dumazetefe42082013-10-03 15:42:29 -0700515 sk->sk_v6_daddr.s6_addr32[0] = 0;
516 sk->sk_v6_daddr.s6_addr32[1] = 0;
517 sk->sk_v6_daddr.s6_addr32[2] = htonl(0x0000ffff);
518 sk->sk_v6_daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 } else {
Eric Dumazetefe42082013-10-03 15:42:29 -0700520 sk->sk_v6_daddr = addr->v6.sin6_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 }
522}
523
524/* Initialize a sctp_addr from an address parameter. */
525static void sctp_v6_from_addr_param(union sctp_addr *addr,
526 union sctp_addr_param *param,
Al Virodd86d132006-11-20 17:11:13 -0800527 __be16 port, int iif)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528{
529 addr->v6.sin6_family = AF_INET6;
530 addr->v6.sin6_port = port;
531 addr->v6.sin6_flowinfo = 0; /* BUG */
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000532 addr->v6.sin6_addr = param->v6.addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533 addr->v6.sin6_scope_id = iif;
534}
535
536/* Initialize an address parameter from a sctp_addr and return the length
537 * of the address parameter.
538 */
539static int sctp_v6_to_addr_param(const union sctp_addr *addr,
540 union sctp_addr_param *param)
541{
Xin Long00987cc2017-07-17 11:29:50 +0800542 int length = sizeof(struct sctp_ipv6addr_param);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543
544 param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS;
Al Virodbc16db2006-11-20 17:01:42 -0800545 param->v6.param_hdr.length = htons(length);
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000546 param->v6.addr = addr->v6.sin6_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547
548 return length;
549}
550
Vlad Yasevich9914ae32011-04-26 21:51:31 +0000551/* Initialize a sctp_addr from struct in6_addr. */
552static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr,
Al Viro854d43a2006-11-20 17:06:24 -0800553 __be16 port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 addr->sa.sa_family = AF_INET6;
556 addr->v6.sin6_port = port;
Alexander Potapenko15339e442017-08-16 20:16:40 +0200557 addr->v6.sin6_flowinfo = 0;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000558 addr->v6.sin6_addr = *saddr;
Alexander Potapenko15339e442017-08-16 20:16:40 +0200559 addr->v6.sin6_scope_id = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560}
561
Xin Long1071ec92018-04-12 14:24:31 +0800562static int __sctp_v6_cmp_addr(const union sctp_addr *addr1,
563 const union sctp_addr *addr2)
564{
565 if (addr1->sa.sa_family != addr2->sa.sa_family) {
566 if (addr1->sa.sa_family == AF_INET &&
567 addr2->sa.sa_family == AF_INET6 &&
568 ipv6_addr_v4mapped(&addr2->v6.sin6_addr) &&
569 addr2->v6.sin6_addr.s6_addr32[3] ==
570 addr1->v4.sin_addr.s_addr)
571 return 1;
572
573 if (addr2->sa.sa_family == AF_INET &&
574 addr1->sa.sa_family == AF_INET6 &&
575 ipv6_addr_v4mapped(&addr1->v6.sin6_addr) &&
576 addr1->v6.sin6_addr.s6_addr32[3] ==
577 addr2->v4.sin_addr.s_addr)
578 return 1;
579
580 return 0;
581 }
582
583 if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr))
584 return 0;
585
586 /* If this is a linklocal address, compare the scope_id. */
587 if ((ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) &&
588 addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id &&
589 addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)
590 return 0;
591
592 return 1;
593}
594
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595/* Compare addresses exactly.
596 * v4-mapped-v6 is also in consideration.
597 */
598static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
599 const union sctp_addr *addr2)
600{
Xin Long1071ec92018-04-12 14:24:31 +0800601 return __sctp_v6_cmp_addr(addr1, addr2) &&
602 addr1->v6.sin6_port == addr2->v6.sin6_port;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603}
604
605/* Initialize addr struct to INADDR_ANY. */
Al Viro6fbfa9f2006-11-20 17:24:53 -0800606static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607{
608 memset(addr, 0x00, sizeof(union sctp_addr));
609 addr->v6.sin6_family = AF_INET6;
610 addr->v6.sin6_port = port;
611}
612
613/* Is this a wildcard address? */
614static int sctp_v6_is_any(const union sctp_addr *addr)
615{
Brian Haleyb9b9e102005-04-28 11:59:16 -0700616 return ipv6_addr_any(&addr->v6.sin6_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617}
618
619/* Should this be available for binding? */
620static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp)
621{
622 int type;
Xin Long9b974202016-07-22 17:38:51 +0800623 struct net *net = sock_net(&sp->inet.sk);
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000624 const struct in6_addr *in6 = (const struct in6_addr *)&addr->v6.sin6_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625
626 type = ipv6_addr_type(in6);
627 if (IPV6_ADDR_ANY == type)
628 return 1;
629 if (type == IPV6_ADDR_MAPPED) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
631 return 0;
632 sctp_v6_map_v4(addr);
633 return sctp_get_af_specific(AF_INET)->available(addr, sp);
634 }
635 if (!(type & IPV6_ADDR_UNICAST))
636 return 0;
637
Xin Long9b974202016-07-22 17:38:51 +0800638 return sp->inet.freebind || net->ipv6.sysctl.ip_nonlocal_bind ||
639 ipv6_chk_addr(net, in6, NULL, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640}
641
642/* This function checks if the address is a valid address to be used for
643 * SCTP.
644 *
645 * Output:
646 * Return 0 - If the address is a non-unicast or an illegal address.
647 * Return 1 - If the address is a unicast.
648 */
Vlad Yasevich5636bef2006-06-17 22:55:35 -0700649static int sctp_v6_addr_valid(union sctp_addr *addr,
650 struct sctp_sock *sp,
651 const struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652{
653 int ret = ipv6_addr_type(&addr->v6.sin6_addr);
654
655 /* Support v4-mapped-v6 address. */
656 if (ret == IPV6_ADDR_MAPPED) {
657 /* Note: This routine is used in input, so v4-mapped-v6
658 * are disallowed here when there is no sctp_sock.
659 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
661 return 0;
662 sctp_v6_map_v4(addr);
Vlad Yasevich5636bef2006-06-17 22:55:35 -0700663 return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664 }
665
666 /* Is this a non-unicast address */
667 if (!(ret & IPV6_ADDR_UNICAST))
668 return 0;
669
670 return 1;
671}
672
673/* What is the scope of 'addr'? */
Xin Long1c662012017-08-05 19:59:54 +0800674static enum sctp_scope sctp_v6_scope(union sctp_addr *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675{
Xin Long1c662012017-08-05 19:59:54 +0800676 enum sctp_scope retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677 int v6scope;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678
679 /* The IPv6 scope is really a set of bit fields.
680 * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope.
681 */
682
683 v6scope = ipv6_addr_scope(&addr->v6.sin6_addr);
684 switch (v6scope) {
685 case IFA_HOST:
686 retval = SCTP_SCOPE_LOOPBACK;
687 break;
688 case IFA_LINK:
689 retval = SCTP_SCOPE_LINK;
690 break;
691 case IFA_SITE:
692 retval = SCTP_SCOPE_PRIVATE;
693 break;
694 default:
695 retval = SCTP_SCOPE_GLOBAL;
696 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700697 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698
699 return retval;
700}
701
702/* Create and initialize a new sk for the socket to be returned by accept(). */
703static struct sock *sctp_v6_create_accept_sk(struct sock *sk,
David Howellscdfbabf2017-03-09 08:09:05 +0000704 struct sctp_association *asoc,
705 bool kern)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707 struct sock *newsk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
709 struct sctp6_sock *newsctp6sk;
710
David Howellscdfbabf2017-03-09 08:09:05 +0000711 newsk = sk_alloc(sock_net(sk), PF_INET6, GFP_KERNEL, sk->sk_prot, kern);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712 if (!newsk)
713 goto out;
714
715 sock_init_data(NULL, newsk);
716
Vlad Yasevich914e1c82009-02-13 08:33:44 +0000717 sctp_copy_sock(newsk, sk, asoc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718 sock_reset_flag(sk, SOCK_ZAPPED);
719
720 newsctp6sk = (struct sctp6_sock *)newsk;
721 inet_sk(newsk)->pinet6 = &newsctp6sk->inet6;
722
Dave Johnsonb225b882007-07-25 19:49:29 -0400723 sctp_sk(newsk)->v4mapped = sctp_sk(sk)->v4mapped;
724
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725 newnp = inet6_sk(newsk);
726
727 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
Eric Dumazetfdcee2c2017-05-17 07:16:40 -0700728 newnp->ipv6_mc_list = NULL;
729 newnp->ipv6_ac_list = NULL;
730 newnp->ipv6_fl_list = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731
Richard Hainesb7e10c22018-02-24 16:18:51 +0000732 sctp_v6_copy_ip_options(sk, newsk);
Eric Dumazet9470e242015-12-09 07:25:06 -0800733
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
735 * and getpeername().
736 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737 sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);
738
Matija Glavinic Pecotic661dbf32014-02-06 08:30:10 +0100739 newsk->sk_v6_rcv_saddr = sk->sk_v6_rcv_saddr;
740
Arnaldo Carvalho de Meloe6848972005-08-09 19:45:38 -0700741 sk_refcnt_debug_inc(newsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742
743 if (newsk->sk_prot->init(newsk)) {
744 sk_common_release(newsk);
745 newsk = NULL;
746 }
747
748out:
749 return newsk;
750}
751
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600752/* Format a sockaddr for return to user space. This makes sure the return is
753 * AF_INET or AF_INET6 depending on the SCTP_I_WANT_MAPPED_V4_ADDR option.
754 */
755static int sctp_v6_addr_to_user(struct sctp_sock *sp, union sctp_addr *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756{
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600757 if (sp->v4mapped) {
758 if (addr->sa.sa_family == AF_INET)
759 sctp_v4_map_v6(addr);
760 } else {
761 if (addr->sa.sa_family == AF_INET6 &&
762 ipv6_addr_v4mapped(&addr->v6.sin6_addr))
763 sctp_v6_map_v4(addr);
764 }
765
Eric Dumazet6780db22018-04-07 17:15:22 -0700766 if (addr->sa.sa_family == AF_INET) {
767 memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero));
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600768 return sizeof(struct sockaddr_in);
Eric Dumazet6780db22018-04-07 17:15:22 -0700769 }
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600770 return sizeof(struct sockaddr_in6);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771}
772
773/* Where did this skb come from? */
774static int sctp_v6_skb_iif(const struct sk_buff *skb)
775{
Marcelo Ricardo Leitner1f45f782016-07-13 15:08:57 -0300776 return IP6CB(skb)->iif;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777}
778
779/* Was this packet marked by Explicit Congestion Notification? */
780static int sctp_v6_is_ce(const struct sk_buff *skb)
781{
Xin Long978aa042017-10-28 19:43:57 +0800782 return *((__u32 *)(ipv6_hdr(skb))) & (__force __u32)htonl(1 << 20);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783}
784
785/* Dump the v6 addr to the seq file. */
786static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
787{
Harvey Harrison5b095d9892008-10-29 12:52:50 -0700788 seq_printf(seq, "%pI6 ", &addr->v6.sin6_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789}
790
Vlad Yasevichb9031d92008-06-04 12:40:15 -0700791static void sctp_v6_ecn_capable(struct sock *sk)
792{
793 inet6_sk(sk)->tclass |= INET_ECN_ECT_0;
794}
795
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796/* Initialize a PF_INET msgname from a ulpevent. */
797static void sctp_inet6_event_msgname(struct sctp_ulpevent *event,
798 char *msgname, int *addrlen)
799{
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600800 union sctp_addr *addr;
801 struct sctp_association *asoc;
802 union sctp_addr *paddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600804 if (!msgname)
805 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600807 addr = (union sctp_addr *)msgname;
808 asoc = event->asoc;
809 paddr = &asoc->peer.primary_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600811 if (paddr->sa.sa_family == AF_INET) {
812 addr->v4.sin_family = AF_INET;
813 addr->v4.sin_port = htons(asoc->peer.port);
814 addr->v4.sin_addr = paddr->v4.sin_addr;
815 } else {
816 addr->v6.sin6_family = AF_INET6;
817 addr->v6.sin6_flowinfo = 0;
818 if (ipv6_addr_type(&paddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
819 addr->v6.sin6_scope_id = paddr->v6.sin6_scope_id;
820 else
821 addr->v6.sin6_scope_id = 0;
822 addr->v6.sin6_port = htons(asoc->peer.port);
823 addr->v6.sin6_addr = paddr->v6.sin6_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824 }
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600825
826 *addrlen = sctp_v6_addr_to_user(sctp_sk(asoc->base.sk), addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827}
828
829/* Initialize a msg_name from an inbound skb. */
830static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname,
831 int *addr_len)
832{
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600833 union sctp_addr *addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834 struct sctphdr *sh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600836 if (!msgname)
837 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600839 addr = (union sctp_addr *)msgname;
840 sh = sctp_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600842 if (ip_hdr(skb)->version == 4) {
843 addr->v4.sin_family = AF_INET;
844 addr->v4.sin_port = sh->source;
Marcelo Ricardo Leitner1f45f782016-07-13 15:08:57 -0300845 addr->v4.sin_addr.s_addr = ip_hdr(skb)->saddr;
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600846 } else {
847 addr->v6.sin6_family = AF_INET6;
848 addr->v6.sin6_flowinfo = 0;
849 addr->v6.sin6_port = sh->source;
850 addr->v6.sin6_addr = ipv6_hdr(skb)->saddr;
Eric W. Biederman7c8a61d2017-11-15 22:17:48 -0600851 if (ipv6_addr_type(&addr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
Marcelo Ricardo Leitner1f45f782016-07-13 15:08:57 -0300852 addr->v6.sin6_scope_id = sctp_v6_skb_iif(skb);
Eric W. Biederman7c8a61d2017-11-15 22:17:48 -0600853 else
854 addr->v6.sin6_scope_id = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855 }
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600856
857 *addr_len = sctp_v6_addr_to_user(sctp_sk(skb->sk), addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858}
859
860/* Do we support this AF? */
861static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp)
862{
863 switch (family) {
864 case AF_INET6:
865 return 1;
866 /* v4-mapped-v6 addresses */
867 case AF_INET:
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700868 if (!__ipv6_only_sock(sctp_opt2sk(sp)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869 return 1;
Marcelo Ricardo Leitner37f47bc2018-01-11 14:22:06 -0200870 /* fallthru */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871 default:
872 return 0;
873 }
874}
875
876/* Address matching with wildcards allowed. This extra level
877 * of indirection lets us choose whether a PF_INET6 should
878 * disallow any v4 addresses if we so choose.
879 */
880static int sctp_inet6_cmp_addr(const union sctp_addr *addr1,
881 const union sctp_addr *addr2,
882 struct sctp_sock *opt)
883{
Vlad Yasevich52cae8f2008-08-18 10:34:34 -0400884 struct sock *sk = sctp_opt2sk(opt);
Xin Long1071ec92018-04-12 14:24:31 +0800885 struct sctp_af *af1, *af2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886
887 af1 = sctp_get_af_specific(addr1->sa.sa_family);
888 af2 = sctp_get_af_specific(addr2->sa.sa_family);
889
890 if (!af1 || !af2)
891 return 0;
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700892
893 /* If the socket is IPv6 only, v4 addrs will not match */
Vlad Yasevich52cae8f2008-08-18 10:34:34 -0400894 if (__ipv6_only_sock(sk) && af1 != af2)
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700895 return 0;
896
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897 /* Today, wildcard AF_INET/AF_INET6. */
Vlad Yasevich52cae8f2008-08-18 10:34:34 -0400898 if (sctp_is_any(sk, addr1) || sctp_is_any(sk, addr2))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899 return 1;
900
Xin Longd6253292018-04-26 14:13:57 +0800901 if (addr1->sa.sa_family == AF_INET && addr2->sa.sa_family == AF_INET)
902 return addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr;
903
Xin Long1071ec92018-04-12 14:24:31 +0800904 return __sctp_v6_cmp_addr(addr1, addr2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905}
906
907/* Verify that the provided sockaddr looks bindable. Common verification,
908 * has already been taken care of.
909 */
910static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
911{
912 struct sctp_af *af;
913
914 /* ASSERT: address family has already been verified. */
915 if (addr->sa.sa_family != AF_INET6)
916 af = sctp_get_af_specific(addr->sa.sa_family);
917 else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918 int type = ipv6_addr_type(&addr->v6.sin6_addr);
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700919 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700921 if (type & IPV6_ADDR_LINKLOCAL) {
Eric W. Biedermanbb2db452012-08-06 08:46:26 +0000922 struct net *net;
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700923 if (!addr->v6.sin6_scope_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700924 return 0;
Eric W. Biedermanbb2db452012-08-06 08:46:26 +0000925 net = sock_net(&opt->inet.sk);
Eric Dumazet40c9c312009-11-05 20:56:46 -0800926 rcu_read_lock();
Eric W. Biedermanbb2db452012-08-06 08:46:26 +0000927 dev = dev_get_by_index_rcu(net, addr->v6.sin6_scope_id);
Laszlo Tothb71d21c2017-10-23 19:19:33 +0200928 if (!dev || !(opt->inet.freebind ||
929 net->ipv6.sysctl.ip_nonlocal_bind ||
930 ipv6_chk_addr(net, &addr->v6.sin6_addr,
931 dev, 0))) {
Eric Dumazet40c9c312009-11-05 20:56:46 -0800932 rcu_read_unlock();
Vlad Yasevich1669d852007-07-03 14:29:23 -0400933 return 0;
934 }
Eric Dumazet40c9c312009-11-05 20:56:46 -0800935 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936 }
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700937
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938 af = opt->pf->af;
939 }
940 return af->available(addr, opt);
941}
942
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700943/* Verify that the provided sockaddr looks sendable. Common verification,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700944 * has already been taken care of.
945 */
946static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
947{
948 struct sctp_af *af = NULL;
949
950 /* ASSERT: address family has already been verified. */
951 if (addr->sa.sa_family != AF_INET6)
952 af = sctp_get_af_specific(addr->sa.sa_family);
953 else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700954 int type = ipv6_addr_type(&addr->v6.sin6_addr);
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700955 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700957 if (type & IPV6_ADDR_LINKLOCAL) {
958 if (!addr->v6.sin6_scope_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959 return 0;
Eric Dumazet40c9c312009-11-05 20:56:46 -0800960 rcu_read_lock();
Eric W. Biedermanbb2db452012-08-06 08:46:26 +0000961 dev = dev_get_by_index_rcu(sock_net(&opt->inet.sk),
Eric Dumazet40c9c312009-11-05 20:56:46 -0800962 addr->v6.sin6_scope_id);
963 rcu_read_unlock();
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700964 if (!dev)
965 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966 }
967 af = opt->pf->af;
968 }
969
970 return af != NULL;
971}
972
973/* Fill in Supported Address Type information for INIT and INIT-ACK
974 * chunks. Note: In the future, we may want to look at sock options
975 * to determine whether a PF_INET6 socket really wants to have IPV4
976 * addresses.
977 * Returns number of addresses supported.
978 */
979static int sctp_inet6_supported_addrs(const struct sctp_sock *opt,
Al Viro3dbe8652006-11-20 17:25:49 -0800980 __be16 *types)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981{
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700982 types[0] = SCTP_PARAM_IPV6_ADDRESS;
983 if (!opt || !ipv6_only_sock(sctp_opt2sk(opt))) {
984 types[1] = SCTP_PARAM_IPV4_ADDRESS;
985 return 2;
986 }
987 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988}
989
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600990/* Handle SCTP_I_WANT_MAPPED_V4_ADDR for getpeername() and getsockname() */
991static int sctp_getname(struct socket *sock, struct sockaddr *uaddr,
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +0100992 int peer)
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600993{
994 int rc;
995
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +0100996 rc = inet6_getname(sock, uaddr, peer);
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600997
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +0100998 if (rc < 0)
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600999 return rc;
1000
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001001 rc = sctp_v6_addr_to_user(sctp_sk(sock->sk),
Jason Gunthorpe299ee122014-07-30 12:40:53 -06001002 (union sctp_addr *)uaddr);
1003
1004 return rc;
1005}
1006
Eric Dumazet90ddc4f2005-12-22 12:49:22 -08001007static const struct proto_ops inet6_seqpacket_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001008 .family = PF_INET6,
1009 .owner = THIS_MODULE,
1010 .release = inet6_release,
1011 .bind = inet6_bind,
Xin Long644fbde2018-05-20 16:39:10 +08001012 .connect = sctp_inet_connect,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001013 .socketpair = sock_no_socketpair,
1014 .accept = inet_accept,
Jason Gunthorpe299ee122014-07-30 12:40:53 -06001015 .getname = sctp_getname,
Linus Torvaldsa11e1d42018-06-28 09:43:44 -07001016 .poll = sctp_poll,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001017 .ioctl = inet6_ioctl,
Arnd Bergmannc7cbdbf2019-04-17 22:51:48 +02001018 .gettstamp = sock_gettstamp,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001019 .listen = sctp_inet_listen,
1020 .shutdown = inet_shutdown,
1021 .setsockopt = sock_common_setsockopt,
1022 .getsockopt = sock_common_getsockopt,
1023 .sendmsg = inet_sendmsg,
Xin Longfd2d1802016-07-22 21:25:42 +08001024 .recvmsg = inet_recvmsg,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001025 .mmap = sock_no_mmap,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001026#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001027 .compat_setsockopt = compat_sock_common_setsockopt,
1028 .compat_getsockopt = compat_sock_common_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001029#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030};
1031
1032static struct inet_protosw sctpv6_seqpacket_protosw = {
1033 .type = SOCK_SEQPACKET,
1034 .protocol = IPPROTO_SCTP,
1035 .prot = &sctpv6_prot,
1036 .ops = &inet6_seqpacket_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037 .flags = SCTP_PROTOSW_FLAG
1038};
1039static struct inet_protosw sctpv6_stream_protosw = {
1040 .type = SOCK_STREAM,
1041 .protocol = IPPROTO_SCTP,
1042 .prot = &sctpv6_prot,
1043 .ops = &inet6_seqpacket_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044 .flags = SCTP_PROTOSW_FLAG,
1045};
1046
Herbert Xue5bbef22007-10-15 12:50:28 -07001047static int sctp6_rcv(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048{
Herbert Xue5bbef22007-10-15 12:50:28 -07001049 return sctp_rcv(skb) ? -1 : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050}
1051
Alexey Dobriyan41135cc2009-09-14 12:22:28 +00001052static const struct inet6_protocol sctpv6_protocol = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053 .handler = sctp6_rcv,
1054 .err_handler = sctp_v6_err,
1055 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1056};
1057
Neil Horman15efbe72008-02-15 09:53:59 -05001058static struct sctp_af sctp_af_inet6 = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001059 .sa_family = AF_INET6,
1060 .sctp_xmit = sctp_v6_xmit,
1061 .setsockopt = ipv6_setsockopt,
1062 .getsockopt = ipv6_getsockopt,
1063 .get_dst = sctp_v6_get_dst,
1064 .get_saddr = sctp_v6_get_saddr,
1065 .copy_addrlist = sctp_v6_copy_addrlist,
1066 .from_skb = sctp_v6_from_skb,
1067 .from_sk = sctp_v6_from_sk,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001068 .from_addr_param = sctp_v6_from_addr_param,
1069 .to_addr_param = sctp_v6_to_addr_param,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001070 .cmp_addr = sctp_v6_cmp_addr,
1071 .scope = sctp_v6_scope,
1072 .addr_valid = sctp_v6_addr_valid,
1073 .inaddr_any = sctp_v6_inaddr_any,
1074 .is_any = sctp_v6_is_any,
1075 .available = sctp_v6_available,
1076 .skb_iif = sctp_v6_skb_iif,
1077 .is_ce = sctp_v6_is_ce,
1078 .seq_dump_addr = sctp_v6_seq_dump_addr,
Vlad Yasevichb9031d92008-06-04 12:40:15 -07001079 .ecn_capable = sctp_v6_ecn_capable,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001080 .net_header_len = sizeof(struct ipv6hdr),
1081 .sockaddr_len = sizeof(struct sockaddr_in6),
Richard Hainesb7e10c22018-02-24 16:18:51 +00001082 .ip_options_len = sctp_v6_ip_options_len,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001083#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001084 .compat_setsockopt = compat_ipv6_setsockopt,
1085 .compat_getsockopt = compat_ipv6_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001086#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001087};
1088
Neil Horman15efbe72008-02-15 09:53:59 -05001089static struct sctp_pf sctp_pf_inet6 = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090 .event_msgname = sctp_inet6_event_msgname,
1091 .skb_msgname = sctp_inet6_skb_msgname,
1092 .af_supported = sctp_inet6_af_supported,
1093 .cmp_addr = sctp_inet6_cmp_addr,
1094 .bind_verify = sctp_inet6_bind_verify,
1095 .send_verify = sctp_inet6_send_verify,
1096 .supported_addrs = sctp_inet6_supported_addrs,
1097 .create_accept_sk = sctp_v6_create_accept_sk,
Jason Gunthorpe299ee122014-07-30 12:40:53 -06001098 .addr_to_user = sctp_v6_addr_to_user,
1099 .to_sk_saddr = sctp_v6_to_sk_saddr,
1100 .to_sk_daddr = sctp_v6_to_sk_daddr,
Richard Hainesb7e10c22018-02-24 16:18:51 +00001101 .copy_ip_options = sctp_v6_copy_ip_options,
Neil Horman15efbe72008-02-15 09:53:59 -05001102 .af = &sctp_af_inet6,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001103};
1104
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001105/* Initialize IPv6 support and register with socket layer. */
Vlad Yasevich270637a2008-03-20 15:17:14 -07001106void sctp_v6_pf_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001107{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001108 /* Register the SCTP specific PF_INET6 functions. */
Neil Horman15efbe72008-02-15 09:53:59 -05001109 sctp_register_pf(&sctp_pf_inet6, PF_INET6);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110
1111 /* Register the SCTP specific AF_INET6 functions. */
Neil Horman15efbe72008-02-15 09:53:59 -05001112 sctp_register_af(&sctp_af_inet6);
Vlad Yasevich270637a2008-03-20 15:17:14 -07001113}
1114
1115void sctp_v6_pf_exit(void)
1116{
1117 list_del(&sctp_af_inet6.list);
1118}
1119
1120/* Initialize IPv6 support and register with socket layer. */
1121int sctp_v6_protosw_init(void)
1122{
1123 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001124
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001125 rc = proto_register(&sctpv6_prot, 1);
1126 if (rc)
1127 return rc;
1128
1129 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
1130 inet6_register_protosw(&sctpv6_seqpacket_protosw);
1131 inet6_register_protosw(&sctpv6_stream_protosw);
1132
1133 return 0;
1134}
1135
Vlad Yasevich270637a2008-03-20 15:17:14 -07001136void sctp_v6_protosw_exit(void)
1137{
1138 inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
1139 inet6_unregister_protosw(&sctpv6_stream_protosw);
1140 proto_unregister(&sctpv6_prot);
1141}
1142
1143
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001144/* Register with inet6 layer. */
1145int sctp_v6_add_protocol(void)
1146{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001147 /* Register notifier for inet6 address additions/deletions. */
1148 register_inet6addr_notifier(&sctp_inet6addr_notifier);
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001149
1150 if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0)
1151 return -EAGAIN;
1152
1153 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001154}
1155
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001156/* Unregister with inet6 layer. */
1157void sctp_v6_del_protocol(void)
1158{
1159 inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP);
1160 unregister_inet6addr_notifier(&sctp_inet6addr_notifier);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161}