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Vlad Yasevich60c778b2008-01-11 09:57:09 -05001/* SCTP kernel implementation
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * (C) Copyright IBM Corp. 2002, 2004
3 * Copyright (c) 2001 Nokia, Inc.
4 * Copyright (c) 2001 La Monte H.P. Yarroll
5 * Copyright (c) 2002-2003 Intel Corp.
6 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -05007 * This file is part of the SCTP kernel implementation
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 *
9 * SCTP over IPv6.
10 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -050011 * This SCTP implementation is free software;
Linus Torvalds1da177e2005-04-16 15:20:36 -070012 * you can redistribute it and/or modify it under the terms of
13 * the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
15 * any later version.
16 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -050017 * This SCTP implementation is distributed in the hope that it
Linus Torvalds1da177e2005-04-16 15:20:36 -070018 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
19 * ************************
20 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
21 * See the GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with GNU CC; see the file COPYING. If not, write to
25 * the Free Software Foundation, 59 Temple Place - Suite 330,
26 * Boston, MA 02111-1307, USA.
27 *
28 * Please send any bug reports or fixes you make to the
29 * email address(es):
30 * lksctp developers <lksctp-developers@lists.sourceforge.net>
31 *
32 * Or submit a bug report through the following website:
33 * http://www.sf.net/projects/lksctp
34 *
35 * Written or modified by:
36 * Le Yanqun <yanqun.le@nokia.com>
37 * Hui Huang <hui.huang@nokia.com>
38 * La Monte H.P. Yarroll <piggy@acm.org>
39 * Sridhar Samudrala <sri@us.ibm.com>
40 * Jon Grimm <jgrimm@us.ibm.com>
41 * Ardelle Fan <ardelle.fan@intel.com>
42 *
43 * Based on:
44 * linux/net/ipv6/tcp_ipv6.c
45 *
46 * Any bugs reported given to us we will try to fix... any fixes shared will
47 * be incorporated into the next SCTP release.
48 */
49
50#include <linux/module.h>
51#include <linux/errno.h>
52#include <linux/types.h>
53#include <linux/socket.h>
54#include <linux/sockios.h>
55#include <linux/net.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070056#include <linux/in.h>
57#include <linux/in6.h>
58#include <linux/netdevice.h>
59#include <linux/init.h>
60#include <linux/ipsec.h>
61
62#include <linux/ipv6.h>
63#include <linux/icmpv6.h>
64#include <linux/random.h>
65#include <linux/seq_file.h>
66
67#include <net/protocol.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070068#include <net/ndisc.h>
Arnaldo Carvalho de Meloc752f072005-08-09 20:08:28 -070069#include <net/ip.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070070#include <net/ipv6.h>
71#include <net/transp_v6.h>
72#include <net/addrconf.h>
73#include <net/ip6_route.h>
74#include <net/inet_common.h>
75#include <net/inet_ecn.h>
76#include <net/sctp/sctp.h>
77
78#include <asm/uaccess.h>
79
Vlad Yasevich29303542007-09-16 16:02:12 -070080/* Event handler for inet6 address addition/deletion events.
81 * The sctp_local_addr_list needs to be protocted by a spin lock since
82 * multiple notifiers (say IPv4 and IPv6) may be running at the same
83 * time and thus corrupt the list.
84 * The reader side is protected with RCU.
85 */
Adrian Bunk24123182006-12-20 16:08:22 -080086static int sctp_inet6addr_event(struct notifier_block *this, unsigned long ev,
87 void *ptr)
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -080088{
89 struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
Vlad Yasevich29303542007-09-16 16:02:12 -070090 struct sctp_sockaddr_entry *addr = NULL;
91 struct sctp_sockaddr_entry *temp;
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -070092 int found = 0;
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -080093
94 switch (ev) {
95 case NETDEV_UP:
96 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
97 if (addr) {
98 addr->a.v6.sin6_family = AF_INET6;
99 addr->a.v6.sin6_port = 0;
Joe Perches4fe1d582009-01-22 13:49:44 -0800100 ipv6_addr_copy(&addr->a.v6.sin6_addr, &ifa->addr);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800101 addr->a.v6.sin6_scope_id = ifa->idev->dev->ifindex;
Vlad Yasevich29303542007-09-16 16:02:12 -0700102 addr->valid = 1;
103 spin_lock_bh(&sctp_local_addr_lock);
104 list_add_tail_rcu(&addr->list, &sctp_local_addr_list);
105 spin_unlock_bh(&sctp_local_addr_lock);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800106 }
107 break;
108 case NETDEV_DOWN:
Vlad Yasevich29303542007-09-16 16:02:12 -0700109 spin_lock_bh(&sctp_local_addr_lock);
110 list_for_each_entry_safe(addr, temp,
111 &sctp_local_addr_list, list) {
Pavel Emelyanova40a7d12008-04-12 18:40:38 -0700112 if (addr->a.sa.sa_family == AF_INET6 &&
113 ipv6_addr_equal(&addr->a.v6.sin6_addr,
114 &ifa->addr)) {
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -0700115 found = 1;
Vlad Yasevich29303542007-09-16 16:02:12 -0700116 addr->valid = 0;
117 list_del_rcu(&addr->list);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800118 break;
119 }
120 }
Vlad Yasevich29303542007-09-16 16:02:12 -0700121 spin_unlock_bh(&sctp_local_addr_lock);
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -0700122 if (found)
Vlad Yasevich29303542007-09-16 16:02:12 -0700123 call_rcu(&addr->rcu, sctp_local_addr_free);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800124 break;
125 }
126
127 return NOTIFY_DONE;
128}
129
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130static struct notifier_block sctp_inet6addr_notifier = {
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800131 .notifier_call = sctp_inet6addr_event,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132};
133
134/* ICMP error handler. */
135SCTP_STATIC void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700136 u8 type, u8 code, int offset, __be32 info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137{
138 struct inet6_dev *idev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 struct sock *sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 struct sctp_association *asoc;
141 struct sctp_transport *transport;
142 struct ipv6_pinfo *np;
Arnaldo Carvalho de Melo2e07fa92007-04-10 21:22:35 -0700143 sk_buff_data_t saveip, savesctp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 int err;
145
146 idev = in6_dev_get(skb->dev);
147
148 /* Fix up skb to look at the embedded net header. */
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700149 saveip = skb->network_header;
150 savesctp = skb->transport_header;
Arnaldo Carvalho de Melo1ced98e2007-03-10 19:57:15 -0300151 skb_reset_network_header(skb);
Arnaldo Carvalho de Meloa27ef742007-03-13 17:17:10 -0300152 skb_set_transport_header(skb, offset);
153 sk = sctp_err_lookup(AF_INET6, skb, sctp_hdr(skb), &asoc, &transport);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 /* Put back, the original pointers. */
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700155 skb->network_header = saveip;
156 skb->transport_header = savesctp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 if (!sk) {
Denis V. Luneve41b5362008-10-08 10:33:26 -0700158 ICMP6_INC_STATS_BH(dev_net(skb->dev), idev, ICMP6_MIB_INERRORS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 goto out;
160 }
161
162 /* Warning: The sock lock is held. Remember to call
163 * sctp_err_finish!
164 */
165
166 switch (type) {
167 case ICMPV6_PKT_TOOBIG:
168 sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info));
169 goto out_unlock;
170 case ICMPV6_PARAMPROB:
171 if (ICMPV6_UNK_NEXTHDR == code) {
Sridhar Samudralad1ad1ff2005-07-18 13:44:10 -0700172 sctp_icmp_proto_unreachable(sk, asoc, transport);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 goto out_unlock;
174 }
175 break;
176 default:
177 break;
178 }
179
180 np = inet6_sk(sk);
181 icmpv6_err_convert(type, code, &err);
182 if (!sock_owned_by_user(sk) && np->recverr) {
183 sk->sk_err = err;
184 sk->sk_error_report(sk);
185 } else { /* Only an error on timeout */
186 sk->sk_err_soft = err;
187 }
188
189out_unlock:
Sridhar Samudralad1ad1ff2005-07-18 13:44:10 -0700190 sctp_err_finish(sk, asoc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191out:
192 if (likely(idev != NULL))
193 in6_dev_put(idev);
194}
195
196/* Based on tcp_v6_xmit() in tcp_ipv6.c. */
Herbert Xuf8803742008-08-03 21:15:08 -0700197static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198{
199 struct sock *sk = skb->sk;
200 struct ipv6_pinfo *np = inet6_sk(sk);
201 struct flowi fl;
202
203 memset(&fl, 0, sizeof(fl));
204
205 fl.proto = sk->sk_protocol;
206
207 /* Fill in the dest address from the route entry passed with the skb
208 * and the source address from the transport.
209 */
Al Virob3f5b3b2006-11-20 17:22:43 -0800210 ipv6_addr_copy(&fl.fl6_dst, &transport->ipaddr.v6.sin6_addr);
Al Viroa9266262006-11-20 17:13:58 -0800211 ipv6_addr_copy(&fl.fl6_src, &transport->saddr.v6.sin6_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212
213 fl.fl6_flowlabel = np->flow_label;
214 IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel);
215 if (ipv6_addr_type(&fl.fl6_src) & IPV6_ADDR_LINKLOCAL)
Al Viroa9266262006-11-20 17:13:58 -0800216 fl.oif = transport->saddr.v6.sin6_scope_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 else
218 fl.oif = sk->sk_bound_dev_if;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219
220 if (np->opt && np->opt->srcrt) {
221 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
222 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
223 }
224
Harvey Harrison5b095d9892008-10-29 12:52:50 -0700225 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800226 __func__, skb, skb->len,
Harvey Harrisonfdb46ee2008-10-28 16:10:17 -0700227 &fl.fl6_src, &fl.fl6_dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228
229 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
230
Herbert Xuf8803742008-08-03 21:15:08 -0700231 if (!(transport->param_flags & SPP_PMTUD_ENABLE))
232 skb->local_df = 1;
233
234 return ip6_xmit(sk, skb, &fl, np->opt, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235}
236
237/* Returns the dst cache entry for the given source and destination ip
238 * addresses.
239 */
240static struct dst_entry *sctp_v6_get_dst(struct sctp_association *asoc,
241 union sctp_addr *daddr,
242 union sctp_addr *saddr)
243{
244 struct dst_entry *dst;
245 struct flowi fl;
246
247 memset(&fl, 0, sizeof(fl));
248 ipv6_addr_copy(&fl.fl6_dst, &daddr->v6.sin6_addr);
249 if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
250 fl.oif = daddr->v6.sin6_scope_id;
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900251
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252
Harvey Harrison5b095d9892008-10-29 12:52:50 -0700253 SCTP_DEBUG_PRINTK("%s: DST=%pI6 ", __func__, &fl.fl6_dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254
255 if (saddr) {
256 ipv6_addr_copy(&fl.fl6_src, &saddr->v6.sin6_addr);
Harvey Harrison5b095d9892008-10-29 12:52:50 -0700257 SCTP_DEBUG_PRINTK("SRC=%pI6 - ", &fl.fl6_src);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 }
259
Daniel Lezcano4591db42008-03-05 10:48:10 -0800260 dst = ip6_route_output(&init_net, NULL, &fl);
Ville Nuorvala42513202006-10-16 22:10:05 -0700261 if (!dst->error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 struct rt6_info *rt;
263 rt = (struct rt6_info *)dst;
Harvey Harrison5b095d9892008-10-29 12:52:50 -0700264 SCTP_DEBUG_PRINTK("rt6_dst:%pI6 rt6_src:%pI6\n",
Harvey Harrisonfdb46ee2008-10-28 16:10:17 -0700265 &rt->rt6i_dst.addr, &rt->rt6i_src.addr);
Ville Nuorvala42513202006-10-16 22:10:05 -0700266 return dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 }
Ville Nuorvala42513202006-10-16 22:10:05 -0700268 SCTP_DEBUG_PRINTK("NO ROUTE\n");
269 dst_release(dst);
270 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271}
272
273/* Returns the number of consecutive initial bits that match in the 2 ipv6
274 * addresses.
275 */
276static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
277 union sctp_addr *s2)
278{
279 struct in6_addr *a1 = &s1->v6.sin6_addr;
280 struct in6_addr *a2 = &s2->v6.sin6_addr;
281 int i, j;
282
283 for (i = 0; i < 4 ; i++) {
Al Virodbc16db2006-11-20 17:01:42 -0800284 __be32 a1xora2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285
286 a1xora2 = a1->s6_addr32[i] ^ a2->s6_addr32[i];
287
288 if ((j = fls(ntohl(a1xora2))))
289 return (i * 32 + 32 - j);
290 }
291
292 return (i*32);
293}
294
295/* Fills in the source address(saddr) based on the destination address(daddr)
296 * and asoc's bind address list.
297 */
YOSHIFUJI Hideakie5117102008-05-29 19:55:05 +0900298static void sctp_v6_get_saddr(struct sctp_sock *sk,
299 struct sctp_association *asoc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 struct dst_entry *dst,
301 union sctp_addr *daddr,
302 union sctp_addr *saddr)
303{
304 struct sctp_bind_addr *bp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 struct sctp_sockaddr_entry *laddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 sctp_scope_t scope;
307 union sctp_addr *baddr = NULL;
308 __u8 matchlen = 0;
309 __u8 bmatchlen;
310
Harvey Harrison5b095d9892008-10-29 12:52:50 -0700311 SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p daddr:%pI6 ",
Harvey Harrisonfdb46ee2008-10-28 16:10:17 -0700312 __func__, asoc, dst, &daddr->v6.sin6_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313
314 if (!asoc) {
Brian Haley191cd582008-08-14 15:33:21 -0700315 ipv6_dev_get_saddr(sock_net(sctp_opt2sk(sk)),
316 dst ? ip6_dst_idev(dst)->dev : NULL,
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +0900317 &daddr->v6.sin6_addr,
YOSHIFUJI Hideakie5117102008-05-29 19:55:05 +0900318 inet6_sk(&sk->inet.sk)->srcprefs,
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +0900319 &saddr->v6.sin6_addr);
Harvey Harrison5b095d9892008-10-29 12:52:50 -0700320 SCTP_DEBUG_PRINTK("saddr from ipv6_get_saddr: %pI6\n",
Harvey Harrisonfdb46ee2008-10-28 16:10:17 -0700321 &saddr->v6.sin6_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 return;
323 }
324
325 scope = sctp_scope(daddr);
326
327 bp = &asoc->base.bind_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328
329 /* Go through the bind address list and find the best source address
330 * that matches the scope of the destination address.
331 */
Vlad Yasevich559cf712007-09-16 16:03:28 -0700332 rcu_read_lock();
333 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
334 if (!laddr->valid)
335 continue;
Vlad Yasevichf57d96b2007-12-20 14:12:24 -0800336 if ((laddr->state == SCTP_ADDR_SRC) &&
Al Viro6244be42006-11-20 17:21:44 -0800337 (laddr->a.sa.sa_family == AF_INET6) &&
338 (scope <= sctp_scope(&laddr->a))) {
Al Virod3f7a542006-11-20 17:12:41 -0800339 bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 if (!baddr || (matchlen < bmatchlen)) {
Al Virod3f7a542006-11-20 17:12:41 -0800341 baddr = &laddr->a;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 matchlen = bmatchlen;
343 }
344 }
345 }
346
347 if (baddr) {
348 memcpy(saddr, baddr, sizeof(union sctp_addr));
Harvey Harrison5b095d9892008-10-29 12:52:50 -0700349 SCTP_DEBUG_PRINTK("saddr: %pI6\n", &saddr->v6.sin6_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 } else {
351 printk(KERN_ERR "%s: asoc:%p Could not find a valid source "
Harvey Harrison5b095d9892008-10-29 12:52:50 -0700352 "address for the dest:%pI6\n",
Harvey Harrisonfdb46ee2008-10-28 16:10:17 -0700353 __func__, asoc, &daddr->v6.sin6_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 }
355
Vlad Yasevich559cf712007-09-16 16:03:28 -0700356 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357}
358
359/* Make a copy of all potential local addresses. */
360static void sctp_v6_copy_addrlist(struct list_head *addrlist,
361 struct net_device *dev)
362{
363 struct inet6_dev *in6_dev;
364 struct inet6_ifaddr *ifp;
365 struct sctp_sockaddr_entry *addr;
366
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -0700367 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 if ((in6_dev = __in6_dev_get(dev)) == NULL) {
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -0700369 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 return;
371 }
372
Jarek Poplawskie2eb8d42007-03-08 14:43:41 -0800373 read_lock_bh(&in6_dev->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 for (ifp = in6_dev->addr_list; ifp; ifp = ifp->if_next) {
375 /* Add the address to the local list. */
376 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
377 if (addr) {
Al Viro2a6fd782006-11-20 17:04:42 -0800378 addr->a.v6.sin6_family = AF_INET6;
379 addr->a.v6.sin6_port = 0;
380 addr->a.v6.sin6_addr = ifp->addr;
381 addr->a.v6.sin6_scope_id = dev->ifindex;
Vlad Yasevich29303542007-09-16 16:02:12 -0700382 addr->valid = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 INIT_LIST_HEAD(&addr->list);
Vlad Yasevich29303542007-09-16 16:02:12 -0700384 INIT_RCU_HEAD(&addr->rcu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 list_add_tail(&addr->list, addrlist);
386 }
387 }
388
Jarek Poplawskie2eb8d42007-03-08 14:43:41 -0800389 read_unlock_bh(&in6_dev->lock);
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -0700390 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391}
392
393/* Initialize a sockaddr_storage from in incoming skb. */
394static void sctp_v6_from_skb(union sctp_addr *addr,struct sk_buff *skb,
395 int is_saddr)
396{
397 void *from;
Al Virod55c41b2006-11-20 17:09:40 -0800398 __be16 *port;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 struct sctphdr *sh;
400
401 port = &addr->v6.sin6_port;
402 addr->v6.sin6_family = AF_INET6;
403 addr->v6.sin6_flowinfo = 0; /* FIXME */
404 addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif;
405
Arnaldo Carvalho de Melo2c0fd382007-03-13 13:59:32 -0300406 sh = sctp_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 if (is_saddr) {
Al Virod55c41b2006-11-20 17:09:40 -0800408 *port = sh->source;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700409 from = &ipv6_hdr(skb)->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 } else {
Al Virod55c41b2006-11-20 17:09:40 -0800411 *port = sh->dest;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700412 from = &ipv6_hdr(skb)->daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 }
414 ipv6_addr_copy(&addr->v6.sin6_addr, from);
415}
416
417/* Initialize an sctp_addr from a socket. */
418static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk)
419{
420 addr->v6.sin6_family = AF_INET6;
Al Viro7dcdbd92006-11-20 17:24:21 -0800421 addr->v6.sin6_port = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 addr->v6.sin6_addr = inet6_sk(sk)->rcv_saddr;
423}
424
425/* Initialize sk->sk_rcv_saddr from sctp_addr. */
426static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
427{
428 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
429 inet6_sk(sk)->rcv_saddr.s6_addr32[0] = 0;
430 inet6_sk(sk)->rcv_saddr.s6_addr32[1] = 0;
431 inet6_sk(sk)->rcv_saddr.s6_addr32[2] = htonl(0x0000ffff);
432 inet6_sk(sk)->rcv_saddr.s6_addr32[3] =
433 addr->v4.sin_addr.s_addr;
434 } else {
435 inet6_sk(sk)->rcv_saddr = addr->v6.sin6_addr;
436 }
437}
438
439/* Initialize sk->sk_daddr from sctp_addr. */
440static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
441{
442 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
443 inet6_sk(sk)->daddr.s6_addr32[0] = 0;
444 inet6_sk(sk)->daddr.s6_addr32[1] = 0;
445 inet6_sk(sk)->daddr.s6_addr32[2] = htonl(0x0000ffff);
446 inet6_sk(sk)->daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
447 } else {
448 inet6_sk(sk)->daddr = addr->v6.sin6_addr;
449 }
450}
451
452/* Initialize a sctp_addr from an address parameter. */
453static void sctp_v6_from_addr_param(union sctp_addr *addr,
454 union sctp_addr_param *param,
Al Virodd86d132006-11-20 17:11:13 -0800455 __be16 port, int iif)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456{
457 addr->v6.sin6_family = AF_INET6;
458 addr->v6.sin6_port = port;
459 addr->v6.sin6_flowinfo = 0; /* BUG */
460 ipv6_addr_copy(&addr->v6.sin6_addr, &param->v6.addr);
461 addr->v6.sin6_scope_id = iif;
462}
463
464/* Initialize an address parameter from a sctp_addr and return the length
465 * of the address parameter.
466 */
467static int sctp_v6_to_addr_param(const union sctp_addr *addr,
468 union sctp_addr_param *param)
469{
470 int length = sizeof(sctp_ipv6addr_param_t);
471
472 param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS;
Al Virodbc16db2006-11-20 17:01:42 -0800473 param->v6.param_hdr.length = htons(length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 ipv6_addr_copy(&param->v6.addr, &addr->v6.sin6_addr);
475
476 return length;
477}
478
479/* Initialize a sctp_addr from a dst_entry. */
480static void sctp_v6_dst_saddr(union sctp_addr *addr, struct dst_entry *dst,
Al Viro854d43a2006-11-20 17:06:24 -0800481 __be16 port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482{
483 struct rt6_info *rt = (struct rt6_info *)dst;
484 addr->sa.sa_family = AF_INET6;
485 addr->v6.sin6_port = port;
486 ipv6_addr_copy(&addr->v6.sin6_addr, &rt->rt6i_src.addr);
487}
488
489/* Compare addresses exactly.
490 * v4-mapped-v6 is also in consideration.
491 */
492static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
493 const union sctp_addr *addr2)
494{
495 if (addr1->sa.sa_family != addr2->sa.sa_family) {
496 if (addr1->sa.sa_family == AF_INET &&
497 addr2->sa.sa_family == AF_INET6 &&
Brian Haleye773e4f2007-08-24 23:16:08 -0700498 ipv6_addr_v4mapped(&addr2->v6.sin6_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 if (addr2->v6.sin6_port == addr1->v4.sin_port &&
500 addr2->v6.sin6_addr.s6_addr32[3] ==
501 addr1->v4.sin_addr.s_addr)
502 return 1;
503 }
504 if (addr2->sa.sa_family == AF_INET &&
505 addr1->sa.sa_family == AF_INET6 &&
Brian Haleye773e4f2007-08-24 23:16:08 -0700506 ipv6_addr_v4mapped(&addr1->v6.sin6_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 if (addr1->v6.sin6_port == addr2->v4.sin_port &&
508 addr1->v6.sin6_addr.s6_addr32[3] ==
509 addr2->v4.sin_addr.s_addr)
510 return 1;
511 }
512 return 0;
513 }
514 if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr))
515 return 0;
516 /* If this is a linklocal address, compare the scope_id. */
517 if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) {
518 if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id &&
519 (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) {
520 return 0;
521 }
522 }
523
524 return 1;
525}
526
527/* Initialize addr struct to INADDR_ANY. */
Al Viro6fbfa9f2006-11-20 17:24:53 -0800528static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529{
530 memset(addr, 0x00, sizeof(union sctp_addr));
531 addr->v6.sin6_family = AF_INET6;
532 addr->v6.sin6_port = port;
533}
534
535/* Is this a wildcard address? */
536static int sctp_v6_is_any(const union sctp_addr *addr)
537{
Brian Haleyb9b9e102005-04-28 11:59:16 -0700538 return ipv6_addr_any(&addr->v6.sin6_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539}
540
541/* Should this be available for binding? */
542static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp)
543{
544 int type;
545 struct in6_addr *in6 = (struct in6_addr *)&addr->v6.sin6_addr;
546
547 type = ipv6_addr_type(in6);
548 if (IPV6_ADDR_ANY == type)
549 return 1;
550 if (type == IPV6_ADDR_MAPPED) {
551 if (sp && !sp->v4mapped)
552 return 0;
553 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
554 return 0;
555 sctp_v6_map_v4(addr);
556 return sctp_get_af_specific(AF_INET)->available(addr, sp);
557 }
558 if (!(type & IPV6_ADDR_UNICAST))
559 return 0;
560
Daniel Lezcanobfeade02008-01-10 22:43:18 -0800561 return ipv6_chk_addr(&init_net, in6, NULL, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562}
563
564/* This function checks if the address is a valid address to be used for
565 * SCTP.
566 *
567 * Output:
568 * Return 0 - If the address is a non-unicast or an illegal address.
569 * Return 1 - If the address is a unicast.
570 */
Vlad Yasevich5636bef2006-06-17 22:55:35 -0700571static int sctp_v6_addr_valid(union sctp_addr *addr,
572 struct sctp_sock *sp,
573 const struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574{
575 int ret = ipv6_addr_type(&addr->v6.sin6_addr);
576
577 /* Support v4-mapped-v6 address. */
578 if (ret == IPV6_ADDR_MAPPED) {
579 /* Note: This routine is used in input, so v4-mapped-v6
580 * are disallowed here when there is no sctp_sock.
581 */
582 if (!sp || !sp->v4mapped)
583 return 0;
584 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
585 return 0;
586 sctp_v6_map_v4(addr);
Vlad Yasevich5636bef2006-06-17 22:55:35 -0700587 return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588 }
589
590 /* Is this a non-unicast address */
591 if (!(ret & IPV6_ADDR_UNICAST))
592 return 0;
593
594 return 1;
595}
596
597/* What is the scope of 'addr'? */
598static sctp_scope_t sctp_v6_scope(union sctp_addr *addr)
599{
600 int v6scope;
601 sctp_scope_t retval;
602
603 /* The IPv6 scope is really a set of bit fields.
604 * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope.
605 */
606
607 v6scope = ipv6_addr_scope(&addr->v6.sin6_addr);
608 switch (v6scope) {
609 case IFA_HOST:
610 retval = SCTP_SCOPE_LOOPBACK;
611 break;
612 case IFA_LINK:
613 retval = SCTP_SCOPE_LINK;
614 break;
615 case IFA_SITE:
616 retval = SCTP_SCOPE_PRIVATE;
617 break;
618 default:
619 retval = SCTP_SCOPE_GLOBAL;
620 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700621 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622
623 return retval;
624}
625
626/* Create and initialize a new sk for the socket to be returned by accept(). */
627static struct sock *sctp_v6_create_accept_sk(struct sock *sk,
628 struct sctp_association *asoc)
629{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630 struct sock *newsk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
632 struct sctp6_sock *newsctp6sk;
633
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900634 newsk = sk_alloc(sock_net(sk), PF_INET6, GFP_KERNEL, sk->sk_prot);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635 if (!newsk)
636 goto out;
637
638 sock_init_data(NULL, newsk);
639
Vlad Yasevich914e1c82009-02-13 08:33:44 +0000640 sctp_copy_sock(newsk, sk, asoc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 sock_reset_flag(sk, SOCK_ZAPPED);
642
643 newsctp6sk = (struct sctp6_sock *)newsk;
644 inet_sk(newsk)->pinet6 = &newsctp6sk->inet6;
645
Dave Johnsonb225b882007-07-25 19:49:29 -0400646 sctp_sk(newsk)->v4mapped = sctp_sk(sk)->v4mapped;
647
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648 newnp = inet6_sk(newsk);
649
650 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
651
652 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
653 * and getpeername().
654 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655 sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);
656
Arnaldo Carvalho de Meloe6848972005-08-09 19:45:38 -0700657 sk_refcnt_debug_inc(newsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658
659 if (newsk->sk_prot->init(newsk)) {
660 sk_common_release(newsk);
661 newsk = NULL;
662 }
663
664out:
665 return newsk;
666}
667
668/* Map v4 address to mapped v6 address */
669static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
670{
671 if (sp->v4mapped && AF_INET == addr->sa.sa_family)
672 sctp_v4_map_v6(addr);
673}
674
675/* Where did this skb come from? */
676static int sctp_v6_skb_iif(const struct sk_buff *skb)
677{
678 struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
679 return opt->iif;
680}
681
682/* Was this packet marked by Explicit Congestion Notification? */
683static int sctp_v6_is_ce(const struct sk_buff *skb)
684{
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700685 return *((__u32 *)(ipv6_hdr(skb))) & htonl(1 << 20);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686}
687
688/* Dump the v6 addr to the seq file. */
689static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
690{
Harvey Harrison5b095d9892008-10-29 12:52:50 -0700691 seq_printf(seq, "%pI6 ", &addr->v6.sin6_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692}
693
Vlad Yasevichb9031d92008-06-04 12:40:15 -0700694static void sctp_v6_ecn_capable(struct sock *sk)
695{
696 inet6_sk(sk)->tclass |= INET_ECN_ECT_0;
697}
698
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699/* Initialize a PF_INET6 socket msg_name. */
700static void sctp_inet6_msgname(char *msgname, int *addr_len)
701{
702 struct sockaddr_in6 *sin6;
703
704 sin6 = (struct sockaddr_in6 *)msgname;
705 sin6->sin6_family = AF_INET6;
706 sin6->sin6_flowinfo = 0;
707 sin6->sin6_scope_id = 0; /*FIXME */
708 *addr_len = sizeof(struct sockaddr_in6);
709}
710
711/* Initialize a PF_INET msgname from a ulpevent. */
712static void sctp_inet6_event_msgname(struct sctp_ulpevent *event,
713 char *msgname, int *addrlen)
714{
715 struct sockaddr_in6 *sin6, *sin6from;
716
717 if (msgname) {
718 union sctp_addr *addr;
719 struct sctp_association *asoc;
720
721 asoc = event->asoc;
722 sctp_inet6_msgname(msgname, addrlen);
723 sin6 = (struct sockaddr_in6 *)msgname;
724 sin6->sin6_port = htons(asoc->peer.port);
725 addr = &asoc->peer.primary_addr;
726
727 /* Note: If we go to a common v6 format, this code
728 * will change.
729 */
730
731 /* Map ipv4 address into v4-mapped-on-v6 address. */
732 if (sctp_sk(asoc->base.sk)->v4mapped &&
733 AF_INET == addr->sa.sa_family) {
734 sctp_v4_map_v6((union sctp_addr *)sin6);
735 sin6->sin6_addr.s6_addr32[3] =
736 addr->v4.sin_addr.s_addr;
737 return;
738 }
739
740 sin6from = &asoc->peer.primary_addr.v6;
741 ipv6_addr_copy(&sin6->sin6_addr, &sin6from->sin6_addr);
742 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
743 sin6->sin6_scope_id = sin6from->sin6_scope_id;
744 }
745}
746
747/* Initialize a msg_name from an inbound skb. */
748static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname,
749 int *addr_len)
750{
751 struct sctphdr *sh;
752 struct sockaddr_in6 *sin6;
753
754 if (msgname) {
755 sctp_inet6_msgname(msgname, addr_len);
756 sin6 = (struct sockaddr_in6 *)msgname;
Arnaldo Carvalho de Melo2c0fd382007-03-13 13:59:32 -0300757 sh = sctp_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758 sin6->sin6_port = sh->source;
759
760 /* Map ipv4 address into v4-mapped-on-v6 address. */
761 if (sctp_sk(skb->sk)->v4mapped &&
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700762 ip_hdr(skb)->version == 4) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 sctp_v4_map_v6((union sctp_addr *)sin6);
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700764 sin6->sin6_addr.s6_addr32[3] = ip_hdr(skb)->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765 return;
766 }
767
768 /* Otherwise, just copy the v6 address. */
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700769 ipv6_addr_copy(&sin6->sin6_addr, &ipv6_hdr(skb)->saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) {
771 struct sctp_ulpevent *ev = sctp_skb2event(skb);
772 sin6->sin6_scope_id = ev->iif;
773 }
774 }
775}
776
777/* Do we support this AF? */
778static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp)
779{
780 switch (family) {
781 case AF_INET6:
782 return 1;
783 /* v4-mapped-v6 addresses */
784 case AF_INET:
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700785 if (!__ipv6_only_sock(sctp_opt2sk(sp)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 return 1;
787 default:
788 return 0;
789 }
790}
791
792/* Address matching with wildcards allowed. This extra level
793 * of indirection lets us choose whether a PF_INET6 should
794 * disallow any v4 addresses if we so choose.
795 */
796static int sctp_inet6_cmp_addr(const union sctp_addr *addr1,
797 const union sctp_addr *addr2,
798 struct sctp_sock *opt)
799{
800 struct sctp_af *af1, *af2;
Vlad Yasevich52cae8f2008-08-18 10:34:34 -0400801 struct sock *sk = sctp_opt2sk(opt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802
803 af1 = sctp_get_af_specific(addr1->sa.sa_family);
804 af2 = sctp_get_af_specific(addr2->sa.sa_family);
805
806 if (!af1 || !af2)
807 return 0;
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700808
809 /* If the socket is IPv6 only, v4 addrs will not match */
Vlad Yasevich52cae8f2008-08-18 10:34:34 -0400810 if (__ipv6_only_sock(sk) && af1 != af2)
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700811 return 0;
812
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813 /* Today, wildcard AF_INET/AF_INET6. */
Vlad Yasevich52cae8f2008-08-18 10:34:34 -0400814 if (sctp_is_any(sk, addr1) || sctp_is_any(sk, addr2))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815 return 1;
816
817 if (addr1->sa.sa_family != addr2->sa.sa_family)
818 return 0;
819
820 return af1->cmp_addr(addr1, addr2);
821}
822
823/* Verify that the provided sockaddr looks bindable. Common verification,
824 * has already been taken care of.
825 */
826static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
827{
828 struct sctp_af *af;
829
830 /* ASSERT: address family has already been verified. */
831 if (addr->sa.sa_family != AF_INET6)
832 af = sctp_get_af_specific(addr->sa.sa_family);
833 else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834 int type = ipv6_addr_type(&addr->v6.sin6_addr);
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700835 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700837 if (type & IPV6_ADDR_LINKLOCAL) {
838 if (!addr->v6.sin6_scope_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839 return 0;
Eric W. Biederman881d9662007-09-17 11:56:21 -0700840 dev = dev_get_by_index(&init_net, addr->v6.sin6_scope_id);
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700841 if (!dev)
842 return 0;
Daniel Lezcanobfeade02008-01-10 22:43:18 -0800843 if (!ipv6_chk_addr(&init_net, &addr->v6.sin6_addr,
844 dev, 0)) {
Vlad Yasevich1669d852007-07-03 14:29:23 -0400845 dev_put(dev);
846 return 0;
847 }
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700848 dev_put(dev);
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700849 } else if (type == IPV6_ADDR_MAPPED) {
850 if (!opt->v4mapped)
851 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852 }
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700853
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854 af = opt->pf->af;
855 }
856 return af->available(addr, opt);
857}
858
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700859/* Verify that the provided sockaddr looks sendable. Common verification,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860 * has already been taken care of.
861 */
862static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
863{
864 struct sctp_af *af = NULL;
865
866 /* ASSERT: address family has already been verified. */
867 if (addr->sa.sa_family != AF_INET6)
868 af = sctp_get_af_specific(addr->sa.sa_family);
869 else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870 int type = ipv6_addr_type(&addr->v6.sin6_addr);
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700871 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700873 if (type & IPV6_ADDR_LINKLOCAL) {
874 if (!addr->v6.sin6_scope_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875 return 0;
Eric W. Biederman881d9662007-09-17 11:56:21 -0700876 dev = dev_get_by_index(&init_net, addr->v6.sin6_scope_id);
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700877 if (!dev)
878 return 0;
879 dev_put(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880 }
881 af = opt->pf->af;
882 }
883
884 return af != NULL;
885}
886
887/* Fill in Supported Address Type information for INIT and INIT-ACK
888 * chunks. Note: In the future, we may want to look at sock options
889 * to determine whether a PF_INET6 socket really wants to have IPV4
890 * addresses.
891 * Returns number of addresses supported.
892 */
893static int sctp_inet6_supported_addrs(const struct sctp_sock *opt,
Al Viro3dbe8652006-11-20 17:25:49 -0800894 __be16 *types)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895{
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700896 types[0] = SCTP_PARAM_IPV6_ADDRESS;
897 if (!opt || !ipv6_only_sock(sctp_opt2sk(opt))) {
898 types[1] = SCTP_PARAM_IPV4_ADDRESS;
899 return 2;
900 }
901 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902}
903
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800904static const struct proto_ops inet6_seqpacket_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800905 .family = PF_INET6,
906 .owner = THIS_MODULE,
907 .release = inet6_release,
908 .bind = inet6_bind,
909 .connect = inet_dgram_connect,
910 .socketpair = sock_no_socketpair,
911 .accept = inet_accept,
912 .getname = inet6_getname,
913 .poll = sctp_poll,
914 .ioctl = inet6_ioctl,
915 .listen = sctp_inet_listen,
916 .shutdown = inet_shutdown,
917 .setsockopt = sock_common_setsockopt,
918 .getsockopt = sock_common_getsockopt,
919 .sendmsg = inet_sendmsg,
920 .recvmsg = sock_common_recvmsg,
921 .mmap = sock_no_mmap,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800922#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800923 .compat_setsockopt = compat_sock_common_setsockopt,
924 .compat_getsockopt = compat_sock_common_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800925#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926};
927
928static struct inet_protosw sctpv6_seqpacket_protosw = {
929 .type = SOCK_SEQPACKET,
930 .protocol = IPPROTO_SCTP,
931 .prot = &sctpv6_prot,
932 .ops = &inet6_seqpacket_ops,
933 .capability = -1,
934 .no_check = 0,
935 .flags = SCTP_PROTOSW_FLAG
936};
937static struct inet_protosw sctpv6_stream_protosw = {
938 .type = SOCK_STREAM,
939 .protocol = IPPROTO_SCTP,
940 .prot = &sctpv6_prot,
941 .ops = &inet6_seqpacket_ops,
942 .capability = -1,
943 .no_check = 0,
944 .flags = SCTP_PROTOSW_FLAG,
945};
946
Herbert Xue5bbef22007-10-15 12:50:28 -0700947static int sctp6_rcv(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948{
Herbert Xue5bbef22007-10-15 12:50:28 -0700949 return sctp_rcv(skb) ? -1 : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950}
951
952static struct inet6_protocol sctpv6_protocol = {
953 .handler = sctp6_rcv,
954 .err_handler = sctp_v6_err,
955 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
956};
957
Neil Horman15efbe72008-02-15 09:53:59 -0500958static struct sctp_af sctp_af_inet6 = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800959 .sa_family = AF_INET6,
960 .sctp_xmit = sctp_v6_xmit,
961 .setsockopt = ipv6_setsockopt,
962 .getsockopt = ipv6_getsockopt,
963 .get_dst = sctp_v6_get_dst,
964 .get_saddr = sctp_v6_get_saddr,
965 .copy_addrlist = sctp_v6_copy_addrlist,
966 .from_skb = sctp_v6_from_skb,
967 .from_sk = sctp_v6_from_sk,
968 .to_sk_saddr = sctp_v6_to_sk_saddr,
969 .to_sk_daddr = sctp_v6_to_sk_daddr,
970 .from_addr_param = sctp_v6_from_addr_param,
971 .to_addr_param = sctp_v6_to_addr_param,
972 .dst_saddr = sctp_v6_dst_saddr,
973 .cmp_addr = sctp_v6_cmp_addr,
974 .scope = sctp_v6_scope,
975 .addr_valid = sctp_v6_addr_valid,
976 .inaddr_any = sctp_v6_inaddr_any,
977 .is_any = sctp_v6_is_any,
978 .available = sctp_v6_available,
979 .skb_iif = sctp_v6_skb_iif,
980 .is_ce = sctp_v6_is_ce,
981 .seq_dump_addr = sctp_v6_seq_dump_addr,
Vlad Yasevichb9031d92008-06-04 12:40:15 -0700982 .ecn_capable = sctp_v6_ecn_capable,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800983 .net_header_len = sizeof(struct ipv6hdr),
984 .sockaddr_len = sizeof(struct sockaddr_in6),
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800985#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800986 .compat_setsockopt = compat_ipv6_setsockopt,
987 .compat_getsockopt = compat_ipv6_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800988#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989};
990
Neil Horman15efbe72008-02-15 09:53:59 -0500991static struct sctp_pf sctp_pf_inet6 = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992 .event_msgname = sctp_inet6_event_msgname,
993 .skb_msgname = sctp_inet6_skb_msgname,
994 .af_supported = sctp_inet6_af_supported,
995 .cmp_addr = sctp_inet6_cmp_addr,
996 .bind_verify = sctp_inet6_bind_verify,
997 .send_verify = sctp_inet6_send_verify,
998 .supported_addrs = sctp_inet6_supported_addrs,
999 .create_accept_sk = sctp_v6_create_accept_sk,
1000 .addr_v4map = sctp_v6_addr_v4map,
Neil Horman15efbe72008-02-15 09:53:59 -05001001 .af = &sctp_af_inet6,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002};
1003
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001004/* Initialize IPv6 support and register with socket layer. */
Vlad Yasevich270637a2008-03-20 15:17:14 -07001005void sctp_v6_pf_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007 /* Register the SCTP specific PF_INET6 functions. */
Neil Horman15efbe72008-02-15 09:53:59 -05001008 sctp_register_pf(&sctp_pf_inet6, PF_INET6);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009
1010 /* Register the SCTP specific AF_INET6 functions. */
Neil Horman15efbe72008-02-15 09:53:59 -05001011 sctp_register_af(&sctp_af_inet6);
Vlad Yasevich270637a2008-03-20 15:17:14 -07001012}
1013
1014void sctp_v6_pf_exit(void)
1015{
1016 list_del(&sctp_af_inet6.list);
1017}
1018
1019/* Initialize IPv6 support and register with socket layer. */
1020int sctp_v6_protosw_init(void)
1021{
1022 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001024 rc = proto_register(&sctpv6_prot, 1);
1025 if (rc)
1026 return rc;
1027
1028 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
1029 inet6_register_protosw(&sctpv6_seqpacket_protosw);
1030 inet6_register_protosw(&sctpv6_stream_protosw);
1031
1032 return 0;
1033}
1034
Vlad Yasevich270637a2008-03-20 15:17:14 -07001035void sctp_v6_protosw_exit(void)
1036{
1037 inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
1038 inet6_unregister_protosw(&sctpv6_stream_protosw);
1039 proto_unregister(&sctpv6_prot);
1040}
1041
1042
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001043/* Register with inet6 layer. */
1044int sctp_v6_add_protocol(void)
1045{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046 /* Register notifier for inet6 address additions/deletions. */
1047 register_inet6addr_notifier(&sctp_inet6addr_notifier);
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001048
1049 if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0)
1050 return -EAGAIN;
1051
1052 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053}
1054
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001055/* Unregister with inet6 layer. */
1056void sctp_v6_del_protocol(void)
1057{
1058 inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP);
1059 unregister_inet6addr_notifier(&sctp_inet6addr_notifier);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001060}