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1/* SCTP kernel implementation
2 * (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 *
7 * This file is part of the SCTP kernel implementation
8 *
9 * SCTP over IPv6.
10 *
11 * This SCTP implementation is free software;
12 * 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 *
17 * This SCTP implementation is distributed in the hope that it
18 * 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, see
25 * <http://www.gnu.org/licenses/>.
26 *
27 * Please send any bug reports or fixes you make to the
28 * email address(es):
29 * lksctp developers <linux-sctp@vger.kernel.org>
30 *
31 * Written or modified by:
32 * Le Yanqun <yanqun.le@nokia.com>
33 * Hui Huang <hui.huang@nokia.com>
34 * La Monte H.P. Yarroll <piggy@acm.org>
35 * Sridhar Samudrala <sri@us.ibm.com>
36 * Jon Grimm <jgrimm@us.ibm.com>
37 * Ardelle Fan <ardelle.fan@intel.com>
38 *
39 * Based on:
40 * linux/net/ipv6/tcp_ipv6.c
41 */
42
43#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
44
45#include <linux/module.h>
46#include <linux/errno.h>
47#include <linux/types.h>
48#include <linux/socket.h>
49#include <linux/sockios.h>
50#include <linux/net.h>
51#include <linux/in.h>
52#include <linux/in6.h>
53#include <linux/netdevice.h>
54#include <linux/init.h>
55#include <linux/ipsec.h>
56#include <linux/slab.h>
57
58#include <linux/ipv6.h>
59#include <linux/icmpv6.h>
60#include <linux/random.h>
61#include <linux/seq_file.h>
62
63#include <net/protocol.h>
64#include <net/ndisc.h>
65#include <net/ip.h>
66#include <net/ipv6.h>
67#include <net/transp_v6.h>
68#include <net/addrconf.h>
69#include <net/ip6_route.h>
70#include <net/inet_common.h>
71#include <net/inet_ecn.h>
72#include <net/sctp/sctp.h>
73
74#include <linux/uaccess.h>
75
76static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
77 union sctp_addr *s2);
78static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr,
79 __be16 port);
80static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
81 const union sctp_addr *addr2);
82
83/* Event handler for inet6 address addition/deletion events.
84 * The sctp_local_addr_list needs to be protocted by a spin lock since
85 * multiple notifiers (say IPv4 and IPv6) may be running at the same
86 * time and thus corrupt the list.
87 * The reader side is protected with RCU.
88 */
89static int sctp_inet6addr_event(struct notifier_block *this, unsigned long ev,
90 void *ptr)
91{
92 struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
93 struct sctp_sockaddr_entry *addr = NULL;
94 struct sctp_sockaddr_entry *temp;
95 struct net *net = dev_net(ifa->idev->dev);
96 int found = 0;
97
98 switch (ev) {
99 case NETDEV_UP:
100 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
101 if (addr) {
102 addr->a.v6.sin6_family = AF_INET6;
103 addr->a.v6.sin6_port = 0;
104 addr->a.v6.sin6_addr = ifa->addr;
105 addr->a.v6.sin6_scope_id = ifa->idev->dev->ifindex;
106 addr->valid = 1;
107 spin_lock_bh(&net->sctp.local_addr_lock);
108 list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
109 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
110 spin_unlock_bh(&net->sctp.local_addr_lock);
111 }
112 break;
113 case NETDEV_DOWN:
114 spin_lock_bh(&net->sctp.local_addr_lock);
115 list_for_each_entry_safe(addr, temp,
116 &net->sctp.local_addr_list, list) {
117 if (addr->a.sa.sa_family == AF_INET6 &&
118 ipv6_addr_equal(&addr->a.v6.sin6_addr,
119 &ifa->addr)) {
120 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
121 found = 1;
122 addr->valid = 0;
123 list_del_rcu(&addr->list);
124 break;
125 }
126 }
127 spin_unlock_bh(&net->sctp.local_addr_lock);
128 if (found)
129 kfree_rcu(addr, rcu);
130 break;
131 }
132
133 return NOTIFY_DONE;
134}
135
136static struct notifier_block sctp_inet6addr_notifier = {
137 .notifier_call = sctp_inet6addr_event,
138};
139
140/* ICMP error handler. */
141static void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
142 u8 type, u8 code, int offset, __be32 info)
143{
144 struct inet6_dev *idev;
145 struct sock *sk;
146 struct sctp_association *asoc;
147 struct sctp_transport *transport;
148 struct ipv6_pinfo *np;
149 __u16 saveip, savesctp;
150 int err;
151 struct net *net = dev_net(skb->dev);
152
153 idev = in6_dev_get(skb->dev);
154
155 /* Fix up skb to look at the embedded net header. */
156 saveip = skb->network_header;
157 savesctp = skb->transport_header;
158 skb_reset_network_header(skb);
159 skb_set_transport_header(skb, offset);
160 sk = sctp_err_lookup(net, AF_INET6, skb, sctp_hdr(skb), &asoc, &transport);
161 /* Put back, the original pointers. */
162 skb->network_header = saveip;
163 skb->transport_header = savesctp;
164 if (!sk) {
165 __ICMP6_INC_STATS(net, idev, ICMP6_MIB_INERRORS);
166 goto out;
167 }
168
169 /* Warning: The sock lock is held. Remember to call
170 * sctp_err_finish!
171 */
172
173 switch (type) {
174 case ICMPV6_PKT_TOOBIG:
175 if (ip6_sk_accept_pmtu(sk))
176 sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info));
177 goto out_unlock;
178 case ICMPV6_PARAMPROB:
179 if (ICMPV6_UNK_NEXTHDR == code) {
180 sctp_icmp_proto_unreachable(sk, asoc, transport);
181 goto out_unlock;
182 }
183 break;
184 case NDISC_REDIRECT:
185 sctp_icmp_redirect(sk, transport, skb);
186 goto out_unlock;
187 default:
188 break;
189 }
190
191 np = inet6_sk(sk);
192 icmpv6_err_convert(type, code, &err);
193 if (!sock_owned_by_user(sk) && np->recverr) {
194 sk->sk_err = err;
195 sk->sk_error_report(sk);
196 } else { /* Only an error on timeout */
197 sk->sk_err_soft = err;
198 }
199
200out_unlock:
201 sctp_err_finish(sk, transport);
202out:
203 if (likely(idev != NULL))
204 in6_dev_put(idev);
205}
206
207static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport)
208{
209 struct sock *sk = skb->sk;
210 struct ipv6_pinfo *np = inet6_sk(sk);
211 struct flowi6 *fl6 = &transport->fl.u.ip6;
212 int res;
213
214 pr_debug("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n", __func__, skb,
215 skb->len, &fl6->saddr, &fl6->daddr);
216
217 IP6_ECN_flow_xmit(sk, fl6->flowlabel);
218
219 if (!(transport->param_flags & SPP_PMTUD_ENABLE))
220 skb->ignore_df = 1;
221
222 SCTP_INC_STATS(sock_net(sk), SCTP_MIB_OUTSCTPPACKS);
223
224 rcu_read_lock();
225 res = ip6_xmit(sk, skb, fl6, sk->sk_mark, rcu_dereference(np->opt),
226 np->tclass);
227 rcu_read_unlock();
228 return res;
229}
230
231/* Returns the dst cache entry for the given source and destination ip
232 * addresses.
233 */
234static void sctp_v6_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
235 struct flowi *fl, struct sock *sk)
236{
237 struct sctp_association *asoc = t->asoc;
238 struct dst_entry *dst = NULL;
239 struct flowi6 *fl6 = &fl->u.ip6;
240 struct sctp_bind_addr *bp;
241 struct ipv6_pinfo *np = inet6_sk(sk);
242 struct sctp_sockaddr_entry *laddr;
243 union sctp_addr *daddr = &t->ipaddr;
244 union sctp_addr dst_saddr;
245 struct in6_addr *final_p, final;
246 enum sctp_scope scope;
247 __u8 matchlen = 0;
248
249 memset(fl6, 0, sizeof(struct flowi6));
250 fl6->daddr = daddr->v6.sin6_addr;
251 fl6->fl6_dport = daddr->v6.sin6_port;
252 fl6->flowi6_proto = IPPROTO_SCTP;
253 if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
254 fl6->flowi6_oif = daddr->v6.sin6_scope_id;
255 else if (asoc)
256 fl6->flowi6_oif = asoc->base.sk->sk_bound_dev_if;
257
258 pr_debug("%s: dst=%pI6 ", __func__, &fl6->daddr);
259
260 if (asoc)
261 fl6->fl6_sport = htons(asoc->base.bind_addr.port);
262
263 if (saddr) {
264 fl6->saddr = saddr->v6.sin6_addr;
265 fl6->fl6_sport = saddr->v6.sin6_port;
266
267 pr_debug("src=%pI6 - ", &fl6->saddr);
268 }
269
270 rcu_read_lock();
271 final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
272 rcu_read_unlock();
273
274 dst = ip6_dst_lookup_flow(sk, fl6, final_p);
275 if (!asoc || saddr)
276 goto out;
277
278 bp = &asoc->base.bind_addr;
279 scope = sctp_scope(daddr);
280 /* ip6_dst_lookup has filled in the fl6->saddr for us. Check
281 * to see if we can use it.
282 */
283 if (!IS_ERR(dst)) {
284 /* Walk through the bind address list and look for a bind
285 * address that matches the source address of the returned dst.
286 */
287 sctp_v6_to_addr(&dst_saddr, &fl6->saddr, htons(bp->port));
288 rcu_read_lock();
289 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
290 if (!laddr->valid || laddr->state == SCTP_ADDR_DEL ||
291 (laddr->state != SCTP_ADDR_SRC &&
292 !asoc->src_out_of_asoc_ok))
293 continue;
294
295 /* Do not compare against v4 addrs */
296 if ((laddr->a.sa.sa_family == AF_INET6) &&
297 (sctp_v6_cmp_addr(&dst_saddr, &laddr->a))) {
298 rcu_read_unlock();
299 goto out;
300 }
301 }
302 rcu_read_unlock();
303 /* None of the bound addresses match the source address of the
304 * dst. So release it.
305 */
306 dst_release(dst);
307 dst = NULL;
308 }
309
310 /* Walk through the bind address list and try to get the
311 * best source address for a given destination.
312 */
313 rcu_read_lock();
314 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
315 struct dst_entry *bdst;
316 __u8 bmatchlen;
317
318 if (!laddr->valid ||
319 laddr->state != SCTP_ADDR_SRC ||
320 laddr->a.sa.sa_family != AF_INET6 ||
321 scope > sctp_scope(&laddr->a))
322 continue;
323
324 fl6->saddr = laddr->a.v6.sin6_addr;
325 fl6->fl6_sport = laddr->a.v6.sin6_port;
326 final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
327 bdst = ip6_dst_lookup_flow(sk, fl6, final_p);
328
329 if (IS_ERR(bdst))
330 continue;
331
332 if (ipv6_chk_addr(dev_net(bdst->dev),
333 &laddr->a.v6.sin6_addr, bdst->dev, 1)) {
334 if (!IS_ERR_OR_NULL(dst))
335 dst_release(dst);
336 dst = bdst;
337 break;
338 }
339
340 bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a);
341 if (matchlen > bmatchlen) {
342 dst_release(bdst);
343 continue;
344 }
345
346 if (!IS_ERR_OR_NULL(dst))
347 dst_release(dst);
348 dst = bdst;
349 matchlen = bmatchlen;
350 }
351 rcu_read_unlock();
352
353out:
354 if (!IS_ERR_OR_NULL(dst)) {
355 struct rt6_info *rt;
356
357 rt = (struct rt6_info *)dst;
358 t->dst = dst;
359 t->dst_cookie = rt6_get_cookie(rt);
360 pr_debug("rt6_dst:%pI6/%d rt6_src:%pI6\n",
361 &rt->rt6i_dst.addr, rt->rt6i_dst.plen,
362 &fl6->saddr);
363 } else {
364 t->dst = NULL;
365
366 pr_debug("no route\n");
367 }
368}
369
370/* Returns the number of consecutive initial bits that match in the 2 ipv6
371 * addresses.
372 */
373static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
374 union sctp_addr *s2)
375{
376 return ipv6_addr_diff(&s1->v6.sin6_addr, &s2->v6.sin6_addr);
377}
378
379/* Fills in the source address(saddr) based on the destination address(daddr)
380 * and asoc's bind address list.
381 */
382static void sctp_v6_get_saddr(struct sctp_sock *sk,
383 struct sctp_transport *t,
384 struct flowi *fl)
385{
386 struct flowi6 *fl6 = &fl->u.ip6;
387 union sctp_addr *saddr = &t->saddr;
388
389 pr_debug("%s: asoc:%p dst:%p\n", __func__, t->asoc, t->dst);
390
391 if (t->dst) {
392 saddr->v6.sin6_family = AF_INET6;
393 saddr->v6.sin6_addr = fl6->saddr;
394 }
395}
396
397/* Make a copy of all potential local addresses. */
398static void sctp_v6_copy_addrlist(struct list_head *addrlist,
399 struct net_device *dev)
400{
401 struct inet6_dev *in6_dev;
402 struct inet6_ifaddr *ifp;
403 struct sctp_sockaddr_entry *addr;
404
405 rcu_read_lock();
406 if ((in6_dev = __in6_dev_get(dev)) == NULL) {
407 rcu_read_unlock();
408 return;
409 }
410
411 read_lock_bh(&in6_dev->lock);
412 list_for_each_entry(ifp, &in6_dev->addr_list, if_list) {
413 /* Add the address to the local list. */
414 addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
415 if (addr) {
416 addr->a.v6.sin6_family = AF_INET6;
417 addr->a.v6.sin6_port = 0;
418 addr->a.v6.sin6_addr = ifp->addr;
419 addr->a.v6.sin6_scope_id = dev->ifindex;
420 addr->valid = 1;
421 INIT_LIST_HEAD(&addr->list);
422 list_add_tail(&addr->list, addrlist);
423 }
424 }
425
426 read_unlock_bh(&in6_dev->lock);
427 rcu_read_unlock();
428}
429
430/* Copy over any ip options */
431static void sctp_v6_copy_ip_options(struct sock *sk, struct sock *newsk)
432{
433 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
434 struct ipv6_txoptions *opt;
435
436 newnp = inet6_sk(newsk);
437
438 rcu_read_lock();
439 opt = rcu_dereference(np->opt);
440 if (opt) {
441 opt = ipv6_dup_options(newsk, opt);
442 if (!opt)
443 pr_err("%s: Failed to copy ip options\n", __func__);
444 }
445 RCU_INIT_POINTER(newnp->opt, opt);
446 rcu_read_unlock();
447}
448
449/* Account for the IP options */
450static int sctp_v6_ip_options_len(struct sock *sk)
451{
452 struct ipv6_pinfo *np = inet6_sk(sk);
453 struct ipv6_txoptions *opt;
454 int len = 0;
455
456 rcu_read_lock();
457 opt = rcu_dereference(np->opt);
458 if (opt)
459 len = opt->opt_flen + opt->opt_nflen;
460
461 rcu_read_unlock();
462 return len;
463}
464
465/* Initialize a sockaddr_storage from in incoming skb. */
466static void sctp_v6_from_skb(union sctp_addr *addr, struct sk_buff *skb,
467 int is_saddr)
468{
469 /* Always called on head skb, so this is safe */
470 struct sctphdr *sh = sctp_hdr(skb);
471 struct sockaddr_in6 *sa = &addr->v6;
472
473 addr->v6.sin6_family = AF_INET6;
474 addr->v6.sin6_flowinfo = 0; /* FIXME */
475 addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif;
476
477 if (is_saddr) {
478 sa->sin6_port = sh->source;
479 sa->sin6_addr = ipv6_hdr(skb)->saddr;
480 } else {
481 sa->sin6_port = sh->dest;
482 sa->sin6_addr = ipv6_hdr(skb)->daddr;
483 }
484}
485
486/* Initialize an sctp_addr from a socket. */
487static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk)
488{
489 addr->v6.sin6_family = AF_INET6;
490 addr->v6.sin6_port = 0;
491 addr->v6.sin6_addr = sk->sk_v6_rcv_saddr;
492}
493
494/* Initialize sk->sk_rcv_saddr from sctp_addr. */
495static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
496{
497 if (addr->sa.sa_family == AF_INET) {
498 sk->sk_v6_rcv_saddr.s6_addr32[0] = 0;
499 sk->sk_v6_rcv_saddr.s6_addr32[1] = 0;
500 sk->sk_v6_rcv_saddr.s6_addr32[2] = htonl(0x0000ffff);
501 sk->sk_v6_rcv_saddr.s6_addr32[3] =
502 addr->v4.sin_addr.s_addr;
503 } else {
504 sk->sk_v6_rcv_saddr = addr->v6.sin6_addr;
505 }
506}
507
508/* Initialize sk->sk_daddr from sctp_addr. */
509static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
510{
511 if (addr->sa.sa_family == AF_INET) {
512 sk->sk_v6_daddr.s6_addr32[0] = 0;
513 sk->sk_v6_daddr.s6_addr32[1] = 0;
514 sk->sk_v6_daddr.s6_addr32[2] = htonl(0x0000ffff);
515 sk->sk_v6_daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
516 } else {
517 sk->sk_v6_daddr = addr->v6.sin6_addr;
518 }
519}
520
521/* Initialize a sctp_addr from an address parameter. */
522static void sctp_v6_from_addr_param(union sctp_addr *addr,
523 union sctp_addr_param *param,
524 __be16 port, int iif)
525{
526 addr->v6.sin6_family = AF_INET6;
527 addr->v6.sin6_port = port;
528 addr->v6.sin6_flowinfo = 0; /* BUG */
529 addr->v6.sin6_addr = param->v6.addr;
530 addr->v6.sin6_scope_id = iif;
531}
532
533/* Initialize an address parameter from a sctp_addr and return the length
534 * of the address parameter.
535 */
536static int sctp_v6_to_addr_param(const union sctp_addr *addr,
537 union sctp_addr_param *param)
538{
539 int length = sizeof(struct sctp_ipv6addr_param);
540
541 param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS;
542 param->v6.param_hdr.length = htons(length);
543 param->v6.addr = addr->v6.sin6_addr;
544
545 return length;
546}
547
548/* Initialize a sctp_addr from struct in6_addr. */
549static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr,
550 __be16 port)
551{
552 addr->sa.sa_family = AF_INET6;
553 addr->v6.sin6_port = port;
554 addr->v6.sin6_flowinfo = 0;
555 addr->v6.sin6_addr = *saddr;
556 addr->v6.sin6_scope_id = 0;
557}
558
559static int __sctp_v6_cmp_addr(const union sctp_addr *addr1,
560 const union sctp_addr *addr2)
561{
562 if (addr1->sa.sa_family != addr2->sa.sa_family) {
563 if (addr1->sa.sa_family == AF_INET &&
564 addr2->sa.sa_family == AF_INET6 &&
565 ipv6_addr_v4mapped(&addr2->v6.sin6_addr) &&
566 addr2->v6.sin6_addr.s6_addr32[3] ==
567 addr1->v4.sin_addr.s_addr)
568 return 1;
569
570 if (addr2->sa.sa_family == AF_INET &&
571 addr1->sa.sa_family == AF_INET6 &&
572 ipv6_addr_v4mapped(&addr1->v6.sin6_addr) &&
573 addr1->v6.sin6_addr.s6_addr32[3] ==
574 addr2->v4.sin_addr.s_addr)
575 return 1;
576
577 return 0;
578 }
579
580 if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr))
581 return 0;
582
583 /* If this is a linklocal address, compare the scope_id. */
584 if ((ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) &&
585 addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id &&
586 addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)
587 return 0;
588
589 return 1;
590}
591
592/* Compare addresses exactly.
593 * v4-mapped-v6 is also in consideration.
594 */
595static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
596 const union sctp_addr *addr2)
597{
598 return __sctp_v6_cmp_addr(addr1, addr2) &&
599 addr1->v6.sin6_port == addr2->v6.sin6_port;
600}
601
602/* Initialize addr struct to INADDR_ANY. */
603static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port)
604{
605 memset(addr, 0x00, sizeof(union sctp_addr));
606 addr->v6.sin6_family = AF_INET6;
607 addr->v6.sin6_port = port;
608}
609
610/* Is this a wildcard address? */
611static int sctp_v6_is_any(const union sctp_addr *addr)
612{
613 return ipv6_addr_any(&addr->v6.sin6_addr);
614}
615
616/* Should this be available for binding? */
617static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp)
618{
619 int type;
620 struct net *net = sock_net(&sp->inet.sk);
621 const struct in6_addr *in6 = (const struct in6_addr *)&addr->v6.sin6_addr;
622
623 type = ipv6_addr_type(in6);
624 if (IPV6_ADDR_ANY == type)
625 return 1;
626 if (type == IPV6_ADDR_MAPPED) {
627 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
628 return 0;
629 sctp_v6_map_v4(addr);
630 return sctp_get_af_specific(AF_INET)->available(addr, sp);
631 }
632 if (!(type & IPV6_ADDR_UNICAST))
633 return 0;
634
635 return sp->inet.freebind || net->ipv6.sysctl.ip_nonlocal_bind ||
636 ipv6_chk_addr(net, in6, NULL, 0);
637}
638
639/* This function checks if the address is a valid address to be used for
640 * SCTP.
641 *
642 * Output:
643 * Return 0 - If the address is a non-unicast or an illegal address.
644 * Return 1 - If the address is a unicast.
645 */
646static int sctp_v6_addr_valid(union sctp_addr *addr,
647 struct sctp_sock *sp,
648 const struct sk_buff *skb)
649{
650 int ret = ipv6_addr_type(&addr->v6.sin6_addr);
651
652 /* Support v4-mapped-v6 address. */
653 if (ret == IPV6_ADDR_MAPPED) {
654 /* Note: This routine is used in input, so v4-mapped-v6
655 * are disallowed here when there is no sctp_sock.
656 */
657 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
658 return 0;
659 sctp_v6_map_v4(addr);
660 return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb);
661 }
662
663 /* Is this a non-unicast address */
664 if (!(ret & IPV6_ADDR_UNICAST))
665 return 0;
666
667 return 1;
668}
669
670/* What is the scope of 'addr'? */
671static enum sctp_scope sctp_v6_scope(union sctp_addr *addr)
672{
673 enum sctp_scope retval;
674 int v6scope;
675
676 /* The IPv6 scope is really a set of bit fields.
677 * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope.
678 */
679
680 v6scope = ipv6_addr_scope(&addr->v6.sin6_addr);
681 switch (v6scope) {
682 case IFA_HOST:
683 retval = SCTP_SCOPE_LOOPBACK;
684 break;
685 case IFA_LINK:
686 retval = SCTP_SCOPE_LINK;
687 break;
688 case IFA_SITE:
689 retval = SCTP_SCOPE_PRIVATE;
690 break;
691 default:
692 retval = SCTP_SCOPE_GLOBAL;
693 break;
694 }
695
696 return retval;
697}
698
699/* Create and initialize a new sk for the socket to be returned by accept(). */
700static struct sock *sctp_v6_create_accept_sk(struct sock *sk,
701 struct sctp_association *asoc,
702 bool kern)
703{
704 struct sock *newsk;
705 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
706 struct sctp6_sock *newsctp6sk;
707
708 newsk = sk_alloc(sock_net(sk), PF_INET6, GFP_KERNEL, sk->sk_prot, kern);
709 if (!newsk)
710 goto out;
711
712 sock_init_data(NULL, newsk);
713
714 sctp_copy_sock(newsk, sk, asoc);
715 sock_reset_flag(sk, SOCK_ZAPPED);
716
717 newsctp6sk = (struct sctp6_sock *)newsk;
718 inet_sk(newsk)->pinet6 = &newsctp6sk->inet6;
719
720 sctp_sk(newsk)->v4mapped = sctp_sk(sk)->v4mapped;
721
722 newnp = inet6_sk(newsk);
723
724 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
725 newnp->ipv6_mc_list = NULL;
726 newnp->ipv6_ac_list = NULL;
727 newnp->ipv6_fl_list = NULL;
728
729 sctp_v6_copy_ip_options(sk, newsk);
730
731 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
732 * and getpeername().
733 */
734 sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);
735
736 newsk->sk_v6_rcv_saddr = sk->sk_v6_rcv_saddr;
737
738 sk_refcnt_debug_inc(newsk);
739
740 if (newsk->sk_prot->init(newsk)) {
741 sk_common_release(newsk);
742 newsk = NULL;
743 }
744
745out:
746 return newsk;
747}
748
749/* Format a sockaddr for return to user space. This makes sure the return is
750 * AF_INET or AF_INET6 depending on the SCTP_I_WANT_MAPPED_V4_ADDR option.
751 */
752static int sctp_v6_addr_to_user(struct sctp_sock *sp, union sctp_addr *addr)
753{
754 if (sp->v4mapped) {
755 if (addr->sa.sa_family == AF_INET)
756 sctp_v4_map_v6(addr);
757 } else {
758 if (addr->sa.sa_family == AF_INET6 &&
759 ipv6_addr_v4mapped(&addr->v6.sin6_addr))
760 sctp_v6_map_v4(addr);
761 }
762
763 if (addr->sa.sa_family == AF_INET) {
764 memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero));
765 return sizeof(struct sockaddr_in);
766 }
767 return sizeof(struct sockaddr_in6);
768}
769
770/* Where did this skb come from? */
771static int sctp_v6_skb_iif(const struct sk_buff *skb)
772{
773 return IP6CB(skb)->iif;
774}
775
776/* Was this packet marked by Explicit Congestion Notification? */
777static int sctp_v6_is_ce(const struct sk_buff *skb)
778{
779 return *((__u32 *)(ipv6_hdr(skb))) & (__force __u32)htonl(1 << 20);
780}
781
782/* Dump the v6 addr to the seq file. */
783static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
784{
785 seq_printf(seq, "%pI6 ", &addr->v6.sin6_addr);
786}
787
788static void sctp_v6_ecn_capable(struct sock *sk)
789{
790 inet6_sk(sk)->tclass |= INET_ECN_ECT_0;
791}
792
793/* Initialize a PF_INET msgname from a ulpevent. */
794static void sctp_inet6_event_msgname(struct sctp_ulpevent *event,
795 char *msgname, int *addrlen)
796{
797 union sctp_addr *addr;
798 struct sctp_association *asoc;
799 union sctp_addr *paddr;
800
801 if (!msgname)
802 return;
803
804 addr = (union sctp_addr *)msgname;
805 asoc = event->asoc;
806 paddr = &asoc->peer.primary_addr;
807
808 if (paddr->sa.sa_family == AF_INET) {
809 addr->v4.sin_family = AF_INET;
810 addr->v4.sin_port = htons(asoc->peer.port);
811 addr->v4.sin_addr = paddr->v4.sin_addr;
812 } else {
813 addr->v6.sin6_family = AF_INET6;
814 addr->v6.sin6_flowinfo = 0;
815 if (ipv6_addr_type(&paddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
816 addr->v6.sin6_scope_id = paddr->v6.sin6_scope_id;
817 else
818 addr->v6.sin6_scope_id = 0;
819 addr->v6.sin6_port = htons(asoc->peer.port);
820 addr->v6.sin6_addr = paddr->v6.sin6_addr;
821 }
822
823 *addrlen = sctp_v6_addr_to_user(sctp_sk(asoc->base.sk), addr);
824}
825
826/* Initialize a msg_name from an inbound skb. */
827static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname,
828 int *addr_len)
829{
830 union sctp_addr *addr;
831 struct sctphdr *sh;
832
833 if (!msgname)
834 return;
835
836 addr = (union sctp_addr *)msgname;
837 sh = sctp_hdr(skb);
838
839 if (ip_hdr(skb)->version == 4) {
840 addr->v4.sin_family = AF_INET;
841 addr->v4.sin_port = sh->source;
842 addr->v4.sin_addr.s_addr = ip_hdr(skb)->saddr;
843 } else {
844 addr->v6.sin6_family = AF_INET6;
845 addr->v6.sin6_flowinfo = 0;
846 addr->v6.sin6_port = sh->source;
847 addr->v6.sin6_addr = ipv6_hdr(skb)->saddr;
848 if (ipv6_addr_type(&addr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
849 addr->v6.sin6_scope_id = sctp_v6_skb_iif(skb);
850 else
851 addr->v6.sin6_scope_id = 0;
852 }
853
854 *addr_len = sctp_v6_addr_to_user(sctp_sk(skb->sk), addr);
855}
856
857/* Do we support this AF? */
858static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp)
859{
860 switch (family) {
861 case AF_INET6:
862 return 1;
863 /* v4-mapped-v6 addresses */
864 case AF_INET:
865 if (!__ipv6_only_sock(sctp_opt2sk(sp)))
866 return 1;
867 /* fallthru */
868 default:
869 return 0;
870 }
871}
872
873/* Address matching with wildcards allowed. This extra level
874 * of indirection lets us choose whether a PF_INET6 should
875 * disallow any v4 addresses if we so choose.
876 */
877static int sctp_inet6_cmp_addr(const union sctp_addr *addr1,
878 const union sctp_addr *addr2,
879 struct sctp_sock *opt)
880{
881 struct sock *sk = sctp_opt2sk(opt);
882 struct sctp_af *af1, *af2;
883
884 af1 = sctp_get_af_specific(addr1->sa.sa_family);
885 af2 = sctp_get_af_specific(addr2->sa.sa_family);
886
887 if (!af1 || !af2)
888 return 0;
889
890 /* If the socket is IPv6 only, v4 addrs will not match */
891 if (__ipv6_only_sock(sk) && af1 != af2)
892 return 0;
893
894 /* Today, wildcard AF_INET/AF_INET6. */
895 if (sctp_is_any(sk, addr1) || sctp_is_any(sk, addr2))
896 return 1;
897
898 if (addr1->sa.sa_family == AF_INET && addr2->sa.sa_family == AF_INET)
899 return addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr;
900
901 return __sctp_v6_cmp_addr(addr1, addr2);
902}
903
904/* Verify that the provided sockaddr looks bindable. Common verification,
905 * has already been taken care of.
906 */
907static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
908{
909 struct sctp_af *af;
910
911 /* ASSERT: address family has already been verified. */
912 if (addr->sa.sa_family != AF_INET6)
913 af = sctp_get_af_specific(addr->sa.sa_family);
914 else {
915 int type = ipv6_addr_type(&addr->v6.sin6_addr);
916 struct net_device *dev;
917
918 if (type & IPV6_ADDR_LINKLOCAL) {
919 struct net *net;
920 if (!addr->v6.sin6_scope_id)
921 return 0;
922 net = sock_net(&opt->inet.sk);
923 rcu_read_lock();
924 dev = dev_get_by_index_rcu(net, addr->v6.sin6_scope_id);
925 if (!dev || !(opt->inet.freebind ||
926 net->ipv6.sysctl.ip_nonlocal_bind ||
927 ipv6_chk_addr(net, &addr->v6.sin6_addr,
928 dev, 0))) {
929 rcu_read_unlock();
930 return 0;
931 }
932 rcu_read_unlock();
933 }
934
935 af = opt->pf->af;
936 }
937 return af->available(addr, opt);
938}
939
940/* Verify that the provided sockaddr looks sendable. Common verification,
941 * has already been taken care of.
942 */
943static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
944{
945 struct sctp_af *af = NULL;
946
947 /* ASSERT: address family has already been verified. */
948 if (addr->sa.sa_family != AF_INET6)
949 af = sctp_get_af_specific(addr->sa.sa_family);
950 else {
951 int type = ipv6_addr_type(&addr->v6.sin6_addr);
952 struct net_device *dev;
953
954 if (type & IPV6_ADDR_LINKLOCAL) {
955 if (!addr->v6.sin6_scope_id)
956 return 0;
957 rcu_read_lock();
958 dev = dev_get_by_index_rcu(sock_net(&opt->inet.sk),
959 addr->v6.sin6_scope_id);
960 rcu_read_unlock();
961 if (!dev)
962 return 0;
963 }
964 af = opt->pf->af;
965 }
966
967 return af != NULL;
968}
969
970/* Fill in Supported Address Type information for INIT and INIT-ACK
971 * chunks. Note: In the future, we may want to look at sock options
972 * to determine whether a PF_INET6 socket really wants to have IPV4
973 * addresses.
974 * Returns number of addresses supported.
975 */
976static int sctp_inet6_supported_addrs(const struct sctp_sock *opt,
977 __be16 *types)
978{
979 types[0] = SCTP_PARAM_IPV6_ADDRESS;
980 if (!opt || !ipv6_only_sock(sctp_opt2sk(opt))) {
981 types[1] = SCTP_PARAM_IPV4_ADDRESS;
982 return 2;
983 }
984 return 1;
985}
986
987/* Handle SCTP_I_WANT_MAPPED_V4_ADDR for getpeername() and getsockname() */
988static int sctp_getname(struct socket *sock, struct sockaddr *uaddr,
989 int peer)
990{
991 int rc;
992
993 rc = inet6_getname(sock, uaddr, peer);
994
995 if (rc < 0)
996 return rc;
997
998 rc = sctp_v6_addr_to_user(sctp_sk(sock->sk),
999 (union sctp_addr *)uaddr);
1000
1001 return rc;
1002}
1003
1004static const struct proto_ops inet6_seqpacket_ops = {
1005 .family = PF_INET6,
1006 .owner = THIS_MODULE,
1007 .release = inet6_release,
1008 .bind = inet6_bind,
1009 .connect = sctp_inet_connect,
1010 .socketpair = sock_no_socketpair,
1011 .accept = inet_accept,
1012 .getname = sctp_getname,
1013 .poll = sctp_poll,
1014 .ioctl = inet6_ioctl,
1015 .listen = sctp_inet_listen,
1016 .shutdown = inet_shutdown,
1017 .setsockopt = sock_common_setsockopt,
1018 .getsockopt = sock_common_getsockopt,
1019 .sendmsg = inet_sendmsg,
1020 .recvmsg = inet_recvmsg,
1021 .mmap = sock_no_mmap,
1022#ifdef CONFIG_COMPAT
1023 .compat_setsockopt = compat_sock_common_setsockopt,
1024 .compat_getsockopt = compat_sock_common_getsockopt,
1025#endif
1026};
1027
1028static struct inet_protosw sctpv6_seqpacket_protosw = {
1029 .type = SOCK_SEQPACKET,
1030 .protocol = IPPROTO_SCTP,
1031 .prot = &sctpv6_prot,
1032 .ops = &inet6_seqpacket_ops,
1033 .flags = SCTP_PROTOSW_FLAG
1034};
1035static struct inet_protosw sctpv6_stream_protosw = {
1036 .type = SOCK_STREAM,
1037 .protocol = IPPROTO_SCTP,
1038 .prot = &sctpv6_prot,
1039 .ops = &inet6_seqpacket_ops,
1040 .flags = SCTP_PROTOSW_FLAG,
1041};
1042
1043static int sctp6_rcv(struct sk_buff *skb)
1044{
1045 return sctp_rcv(skb) ? -1 : 0;
1046}
1047
1048static const struct inet6_protocol sctpv6_protocol = {
1049 .handler = sctp6_rcv,
1050 .err_handler = sctp_v6_err,
1051 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1052};
1053
1054static struct sctp_af sctp_af_inet6 = {
1055 .sa_family = AF_INET6,
1056 .sctp_xmit = sctp_v6_xmit,
1057 .setsockopt = ipv6_setsockopt,
1058 .getsockopt = ipv6_getsockopt,
1059 .get_dst = sctp_v6_get_dst,
1060 .get_saddr = sctp_v6_get_saddr,
1061 .copy_addrlist = sctp_v6_copy_addrlist,
1062 .from_skb = sctp_v6_from_skb,
1063 .from_sk = sctp_v6_from_sk,
1064 .from_addr_param = sctp_v6_from_addr_param,
1065 .to_addr_param = sctp_v6_to_addr_param,
1066 .cmp_addr = sctp_v6_cmp_addr,
1067 .scope = sctp_v6_scope,
1068 .addr_valid = sctp_v6_addr_valid,
1069 .inaddr_any = sctp_v6_inaddr_any,
1070 .is_any = sctp_v6_is_any,
1071 .available = sctp_v6_available,
1072 .skb_iif = sctp_v6_skb_iif,
1073 .is_ce = sctp_v6_is_ce,
1074 .seq_dump_addr = sctp_v6_seq_dump_addr,
1075 .ecn_capable = sctp_v6_ecn_capable,
1076 .net_header_len = sizeof(struct ipv6hdr),
1077 .sockaddr_len = sizeof(struct sockaddr_in6),
1078 .ip_options_len = sctp_v6_ip_options_len,
1079#ifdef CONFIG_COMPAT
1080 .compat_setsockopt = compat_ipv6_setsockopt,
1081 .compat_getsockopt = compat_ipv6_getsockopt,
1082#endif
1083};
1084
1085static struct sctp_pf sctp_pf_inet6 = {
1086 .event_msgname = sctp_inet6_event_msgname,
1087 .skb_msgname = sctp_inet6_skb_msgname,
1088 .af_supported = sctp_inet6_af_supported,
1089 .cmp_addr = sctp_inet6_cmp_addr,
1090 .bind_verify = sctp_inet6_bind_verify,
1091 .send_verify = sctp_inet6_send_verify,
1092 .supported_addrs = sctp_inet6_supported_addrs,
1093 .create_accept_sk = sctp_v6_create_accept_sk,
1094 .addr_to_user = sctp_v6_addr_to_user,
1095 .to_sk_saddr = sctp_v6_to_sk_saddr,
1096 .to_sk_daddr = sctp_v6_to_sk_daddr,
1097 .copy_ip_options = sctp_v6_copy_ip_options,
1098 .af = &sctp_af_inet6,
1099};
1100
1101/* Initialize IPv6 support and register with socket layer. */
1102void sctp_v6_pf_init(void)
1103{
1104 /* Register the SCTP specific PF_INET6 functions. */
1105 sctp_register_pf(&sctp_pf_inet6, PF_INET6);
1106
1107 /* Register the SCTP specific AF_INET6 functions. */
1108 sctp_register_af(&sctp_af_inet6);
1109}
1110
1111void sctp_v6_pf_exit(void)
1112{
1113 list_del(&sctp_af_inet6.list);
1114}
1115
1116/* Initialize IPv6 support and register with socket layer. */
1117int sctp_v6_protosw_init(void)
1118{
1119 int rc;
1120
1121 rc = proto_register(&sctpv6_prot, 1);
1122 if (rc)
1123 return rc;
1124
1125 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
1126 inet6_register_protosw(&sctpv6_seqpacket_protosw);
1127 inet6_register_protosw(&sctpv6_stream_protosw);
1128
1129 return 0;
1130}
1131
1132void sctp_v6_protosw_exit(void)
1133{
1134 inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
1135 inet6_unregister_protosw(&sctpv6_stream_protosw);
1136 proto_unregister(&sctpv6_prot);
1137}
1138
1139
1140/* Register with inet6 layer. */
1141int sctp_v6_add_protocol(void)
1142{
1143 /* Register notifier for inet6 address additions/deletions. */
1144 register_inet6addr_notifier(&sctp_inet6addr_notifier);
1145
1146 if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0)
1147 return -EAGAIN;
1148
1149 return 0;
1150}
1151
1152/* Unregister with inet6 layer. */
1153void sctp_v6_del_protocol(void)
1154{
1155 inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP);
1156 unregister_inet6addr_notifier(&sctp_inet6addr_notifier);
1157}
1/* SCTP kernel implementation
2 * (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 *
7 * This file is part of the SCTP kernel implementation
8 *
9 * SCTP over IPv6.
10 *
11 * This SCTP implementation is free software;
12 * 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 *
17 * This SCTP implementation is distributed in the hope that it
18 * 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, see
25 * <http://www.gnu.org/licenses/>.
26 *
27 * Please send any bug reports or fixes you make to the
28 * email address(es):
29 * lksctp developers <linux-sctp@vger.kernel.org>
30 *
31 * Written or modified by:
32 * Le Yanqun <yanqun.le@nokia.com>
33 * Hui Huang <hui.huang@nokia.com>
34 * La Monte H.P. Yarroll <piggy@acm.org>
35 * Sridhar Samudrala <sri@us.ibm.com>
36 * Jon Grimm <jgrimm@us.ibm.com>
37 * Ardelle Fan <ardelle.fan@intel.com>
38 *
39 * Based on:
40 * linux/net/ipv6/tcp_ipv6.c
41 */
42
43#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
44
45#include <linux/module.h>
46#include <linux/errno.h>
47#include <linux/types.h>
48#include <linux/socket.h>
49#include <linux/sockios.h>
50#include <linux/net.h>
51#include <linux/in.h>
52#include <linux/in6.h>
53#include <linux/netdevice.h>
54#include <linux/init.h>
55#include <linux/ipsec.h>
56#include <linux/slab.h>
57
58#include <linux/ipv6.h>
59#include <linux/icmpv6.h>
60#include <linux/random.h>
61#include <linux/seq_file.h>
62
63#include <net/protocol.h>
64#include <net/ndisc.h>
65#include <net/ip.h>
66#include <net/ipv6.h>
67#include <net/transp_v6.h>
68#include <net/addrconf.h>
69#include <net/ip6_route.h>
70#include <net/inet_common.h>
71#include <net/inet_ecn.h>
72#include <net/sctp/sctp.h>
73
74#include <asm/uaccess.h>
75
76static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
77 union sctp_addr *s2);
78static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr,
79 __be16 port);
80static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
81 const union sctp_addr *addr2);
82
83/* Event handler for inet6 address addition/deletion events.
84 * The sctp_local_addr_list needs to be protocted by a spin lock since
85 * multiple notifiers (say IPv4 and IPv6) may be running at the same
86 * time and thus corrupt the list.
87 * The reader side is protected with RCU.
88 */
89static int sctp_inet6addr_event(struct notifier_block *this, unsigned long ev,
90 void *ptr)
91{
92 struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
93 struct sctp_sockaddr_entry *addr = NULL;
94 struct sctp_sockaddr_entry *temp;
95 struct net *net = dev_net(ifa->idev->dev);
96 int found = 0;
97
98 switch (ev) {
99 case NETDEV_UP:
100 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
101 if (addr) {
102 addr->a.v6.sin6_family = AF_INET6;
103 addr->a.v6.sin6_port = 0;
104 addr->a.v6.sin6_addr = ifa->addr;
105 addr->a.v6.sin6_scope_id = ifa->idev->dev->ifindex;
106 addr->valid = 1;
107 spin_lock_bh(&net->sctp.local_addr_lock);
108 list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
109 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
110 spin_unlock_bh(&net->sctp.local_addr_lock);
111 }
112 break;
113 case NETDEV_DOWN:
114 spin_lock_bh(&net->sctp.local_addr_lock);
115 list_for_each_entry_safe(addr, temp,
116 &net->sctp.local_addr_list, list) {
117 if (addr->a.sa.sa_family == AF_INET6 &&
118 ipv6_addr_equal(&addr->a.v6.sin6_addr,
119 &ifa->addr)) {
120 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
121 found = 1;
122 addr->valid = 0;
123 list_del_rcu(&addr->list);
124 break;
125 }
126 }
127 spin_unlock_bh(&net->sctp.local_addr_lock);
128 if (found)
129 kfree_rcu(addr, rcu);
130 break;
131 }
132
133 return NOTIFY_DONE;
134}
135
136static struct notifier_block sctp_inet6addr_notifier = {
137 .notifier_call = sctp_inet6addr_event,
138};
139
140/* ICMP error handler. */
141static void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
142 u8 type, u8 code, int offset, __be32 info)
143{
144 struct inet6_dev *idev;
145 struct sock *sk;
146 struct sctp_association *asoc;
147 struct sctp_transport *transport;
148 struct ipv6_pinfo *np;
149 __u16 saveip, savesctp;
150 int err;
151 struct net *net = dev_net(skb->dev);
152
153 idev = in6_dev_get(skb->dev);
154
155 /* Fix up skb to look at the embedded net header. */
156 saveip = skb->network_header;
157 savesctp = skb->transport_header;
158 skb_reset_network_header(skb);
159 skb_set_transport_header(skb, offset);
160 sk = sctp_err_lookup(net, AF_INET6, skb, sctp_hdr(skb), &asoc, &transport);
161 /* Put back, the original pointers. */
162 skb->network_header = saveip;
163 skb->transport_header = savesctp;
164 if (!sk) {
165 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_INERRORS);
166 goto out;
167 }
168
169 /* Warning: The sock lock is held. Remember to call
170 * sctp_err_finish!
171 */
172
173 switch (type) {
174 case ICMPV6_PKT_TOOBIG:
175 if (ip6_sk_accept_pmtu(sk))
176 sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info));
177 goto out_unlock;
178 case ICMPV6_PARAMPROB:
179 if (ICMPV6_UNK_NEXTHDR == code) {
180 sctp_icmp_proto_unreachable(sk, asoc, transport);
181 goto out_unlock;
182 }
183 break;
184 case NDISC_REDIRECT:
185 sctp_icmp_redirect(sk, transport, skb);
186 goto out_unlock;
187 default:
188 break;
189 }
190
191 np = inet6_sk(sk);
192 icmpv6_err_convert(type, code, &err);
193 if (!sock_owned_by_user(sk) && np->recverr) {
194 sk->sk_err = err;
195 sk->sk_error_report(sk);
196 } else { /* Only an error on timeout */
197 sk->sk_err_soft = err;
198 }
199
200out_unlock:
201 sctp_err_finish(sk, asoc);
202out:
203 if (likely(idev != NULL))
204 in6_dev_put(idev);
205}
206
207static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport)
208{
209 struct sock *sk = skb->sk;
210 struct ipv6_pinfo *np = inet6_sk(sk);
211 struct flowi6 *fl6 = &transport->fl.u.ip6;
212 int res;
213
214 pr_debug("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n", __func__, skb,
215 skb->len, &fl6->saddr, &fl6->daddr);
216
217 IP6_ECN_flow_xmit(sk, fl6->flowlabel);
218
219 if (!(transport->param_flags & SPP_PMTUD_ENABLE))
220 skb->ignore_df = 1;
221
222 SCTP_INC_STATS(sock_net(sk), SCTP_MIB_OUTSCTPPACKS);
223
224 rcu_read_lock();
225 res = ip6_xmit(sk, skb, fl6, rcu_dereference(np->opt), np->tclass);
226 rcu_read_unlock();
227 return res;
228}
229
230/* Returns the dst cache entry for the given source and destination ip
231 * addresses.
232 */
233static void sctp_v6_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
234 struct flowi *fl, struct sock *sk)
235{
236 struct sctp_association *asoc = t->asoc;
237 struct dst_entry *dst = NULL;
238 struct flowi6 *fl6 = &fl->u.ip6;
239 struct sctp_bind_addr *bp;
240 struct ipv6_pinfo *np = inet6_sk(sk);
241 struct sctp_sockaddr_entry *laddr;
242 union sctp_addr *baddr = NULL;
243 union sctp_addr *daddr = &t->ipaddr;
244 union sctp_addr dst_saddr;
245 struct in6_addr *final_p, final;
246 __u8 matchlen = 0;
247 __u8 bmatchlen;
248 sctp_scope_t scope;
249
250 memset(fl6, 0, sizeof(struct flowi6));
251 fl6->daddr = daddr->v6.sin6_addr;
252 fl6->fl6_dport = daddr->v6.sin6_port;
253 fl6->flowi6_proto = IPPROTO_SCTP;
254 if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
255 fl6->flowi6_oif = daddr->v6.sin6_scope_id;
256
257 pr_debug("%s: dst=%pI6 ", __func__, &fl6->daddr);
258
259 if (asoc)
260 fl6->fl6_sport = htons(asoc->base.bind_addr.port);
261
262 if (saddr) {
263 fl6->saddr = saddr->v6.sin6_addr;
264 fl6->fl6_sport = saddr->v6.sin6_port;
265
266 pr_debug("src=%pI6 - ", &fl6->saddr);
267 }
268
269 rcu_read_lock();
270 final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
271 rcu_read_unlock();
272
273 dst = ip6_dst_lookup_flow(sk, fl6, final_p);
274 if (!asoc || saddr)
275 goto out;
276
277 bp = &asoc->base.bind_addr;
278 scope = sctp_scope(daddr);
279 /* ip6_dst_lookup has filled in the fl6->saddr for us. Check
280 * to see if we can use it.
281 */
282 if (!IS_ERR(dst)) {
283 /* Walk through the bind address list and look for a bind
284 * address that matches the source address of the returned dst.
285 */
286 sctp_v6_to_addr(&dst_saddr, &fl6->saddr, htons(bp->port));
287 rcu_read_lock();
288 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
289 if (!laddr->valid || laddr->state == SCTP_ADDR_DEL ||
290 (laddr->state != SCTP_ADDR_SRC &&
291 !asoc->src_out_of_asoc_ok))
292 continue;
293
294 /* Do not compare against v4 addrs */
295 if ((laddr->a.sa.sa_family == AF_INET6) &&
296 (sctp_v6_cmp_addr(&dst_saddr, &laddr->a))) {
297 rcu_read_unlock();
298 goto out;
299 }
300 }
301 rcu_read_unlock();
302 /* None of the bound addresses match the source address of the
303 * dst. So release it.
304 */
305 dst_release(dst);
306 dst = NULL;
307 }
308
309 /* Walk through the bind address list and try to get the
310 * best source address for a given destination.
311 */
312 rcu_read_lock();
313 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
314 if (!laddr->valid)
315 continue;
316 if ((laddr->state == SCTP_ADDR_SRC) &&
317 (laddr->a.sa.sa_family == AF_INET6) &&
318 (scope <= sctp_scope(&laddr->a))) {
319 bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a);
320 if (!baddr || (matchlen < bmatchlen)) {
321 baddr = &laddr->a;
322 matchlen = bmatchlen;
323 }
324 }
325 }
326 if (baddr) {
327 fl6->saddr = baddr->v6.sin6_addr;
328 fl6->fl6_sport = baddr->v6.sin6_port;
329 final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
330 dst = ip6_dst_lookup_flow(sk, fl6, final_p);
331 }
332 rcu_read_unlock();
333
334out:
335 if (!IS_ERR_OR_NULL(dst)) {
336 struct rt6_info *rt;
337
338 rt = (struct rt6_info *)dst;
339 t->dst = dst;
340 t->dst_cookie = rt6_get_cookie(rt);
341 pr_debug("rt6_dst:%pI6/%d rt6_src:%pI6\n",
342 &rt->rt6i_dst.addr, rt->rt6i_dst.plen,
343 &fl6->saddr);
344 } else {
345 t->dst = NULL;
346
347 pr_debug("no route\n");
348 }
349}
350
351/* Returns the number of consecutive initial bits that match in the 2 ipv6
352 * addresses.
353 */
354static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
355 union sctp_addr *s2)
356{
357 return ipv6_addr_diff(&s1->v6.sin6_addr, &s2->v6.sin6_addr);
358}
359
360/* Fills in the source address(saddr) based on the destination address(daddr)
361 * and asoc's bind address list.
362 */
363static void sctp_v6_get_saddr(struct sctp_sock *sk,
364 struct sctp_transport *t,
365 struct flowi *fl)
366{
367 struct flowi6 *fl6 = &fl->u.ip6;
368 union sctp_addr *saddr = &t->saddr;
369
370 pr_debug("%s: asoc:%p dst:%p\n", __func__, t->asoc, t->dst);
371
372 if (t->dst) {
373 saddr->v6.sin6_family = AF_INET6;
374 saddr->v6.sin6_addr = fl6->saddr;
375 }
376}
377
378/* Make a copy of all potential local addresses. */
379static void sctp_v6_copy_addrlist(struct list_head *addrlist,
380 struct net_device *dev)
381{
382 struct inet6_dev *in6_dev;
383 struct inet6_ifaddr *ifp;
384 struct sctp_sockaddr_entry *addr;
385
386 rcu_read_lock();
387 if ((in6_dev = __in6_dev_get(dev)) == NULL) {
388 rcu_read_unlock();
389 return;
390 }
391
392 read_lock_bh(&in6_dev->lock);
393 list_for_each_entry(ifp, &in6_dev->addr_list, if_list) {
394 /* Add the address to the local list. */
395 addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
396 if (addr) {
397 addr->a.v6.sin6_family = AF_INET6;
398 addr->a.v6.sin6_port = 0;
399 addr->a.v6.sin6_addr = ifp->addr;
400 addr->a.v6.sin6_scope_id = dev->ifindex;
401 addr->valid = 1;
402 INIT_LIST_HEAD(&addr->list);
403 list_add_tail(&addr->list, addrlist);
404 }
405 }
406
407 read_unlock_bh(&in6_dev->lock);
408 rcu_read_unlock();
409}
410
411/* Initialize a sockaddr_storage from in incoming skb. */
412static void sctp_v6_from_skb(union sctp_addr *addr, struct sk_buff *skb,
413 int is_saddr)
414{
415 __be16 *port;
416 struct sctphdr *sh;
417
418 port = &addr->v6.sin6_port;
419 addr->v6.sin6_family = AF_INET6;
420 addr->v6.sin6_flowinfo = 0; /* FIXME */
421 addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif;
422
423 sh = sctp_hdr(skb);
424 if (is_saddr) {
425 *port = sh->source;
426 addr->v6.sin6_addr = ipv6_hdr(skb)->saddr;
427 } else {
428 *port = sh->dest;
429 addr->v6.sin6_addr = ipv6_hdr(skb)->daddr;
430 }
431}
432
433/* Initialize an sctp_addr from a socket. */
434static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk)
435{
436 addr->v6.sin6_family = AF_INET6;
437 addr->v6.sin6_port = 0;
438 addr->v6.sin6_addr = sk->sk_v6_rcv_saddr;
439}
440
441/* Initialize sk->sk_rcv_saddr from sctp_addr. */
442static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
443{
444 if (addr->sa.sa_family == AF_INET) {
445 sk->sk_v6_rcv_saddr.s6_addr32[0] = 0;
446 sk->sk_v6_rcv_saddr.s6_addr32[1] = 0;
447 sk->sk_v6_rcv_saddr.s6_addr32[2] = htonl(0x0000ffff);
448 sk->sk_v6_rcv_saddr.s6_addr32[3] =
449 addr->v4.sin_addr.s_addr;
450 } else {
451 sk->sk_v6_rcv_saddr = addr->v6.sin6_addr;
452 }
453}
454
455/* Initialize sk->sk_daddr from sctp_addr. */
456static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
457{
458 if (addr->sa.sa_family == AF_INET) {
459 sk->sk_v6_daddr.s6_addr32[0] = 0;
460 sk->sk_v6_daddr.s6_addr32[1] = 0;
461 sk->sk_v6_daddr.s6_addr32[2] = htonl(0x0000ffff);
462 sk->sk_v6_daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
463 } else {
464 sk->sk_v6_daddr = addr->v6.sin6_addr;
465 }
466}
467
468/* Initialize a sctp_addr from an address parameter. */
469static void sctp_v6_from_addr_param(union sctp_addr *addr,
470 union sctp_addr_param *param,
471 __be16 port, int iif)
472{
473 addr->v6.sin6_family = AF_INET6;
474 addr->v6.sin6_port = port;
475 addr->v6.sin6_flowinfo = 0; /* BUG */
476 addr->v6.sin6_addr = param->v6.addr;
477 addr->v6.sin6_scope_id = iif;
478}
479
480/* Initialize an address parameter from a sctp_addr and return the length
481 * of the address parameter.
482 */
483static int sctp_v6_to_addr_param(const union sctp_addr *addr,
484 union sctp_addr_param *param)
485{
486 int length = sizeof(sctp_ipv6addr_param_t);
487
488 param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS;
489 param->v6.param_hdr.length = htons(length);
490 param->v6.addr = addr->v6.sin6_addr;
491
492 return length;
493}
494
495/* Initialize a sctp_addr from struct in6_addr. */
496static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr,
497 __be16 port)
498{
499 addr->sa.sa_family = AF_INET6;
500 addr->v6.sin6_port = port;
501 addr->v6.sin6_addr = *saddr;
502}
503
504/* Compare addresses exactly.
505 * v4-mapped-v6 is also in consideration.
506 */
507static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
508 const union sctp_addr *addr2)
509{
510 if (addr1->sa.sa_family != addr2->sa.sa_family) {
511 if (addr1->sa.sa_family == AF_INET &&
512 addr2->sa.sa_family == AF_INET6 &&
513 ipv6_addr_v4mapped(&addr2->v6.sin6_addr)) {
514 if (addr2->v6.sin6_port == addr1->v4.sin_port &&
515 addr2->v6.sin6_addr.s6_addr32[3] ==
516 addr1->v4.sin_addr.s_addr)
517 return 1;
518 }
519 if (addr2->sa.sa_family == AF_INET &&
520 addr1->sa.sa_family == AF_INET6 &&
521 ipv6_addr_v4mapped(&addr1->v6.sin6_addr)) {
522 if (addr1->v6.sin6_port == addr2->v4.sin_port &&
523 addr1->v6.sin6_addr.s6_addr32[3] ==
524 addr2->v4.sin_addr.s_addr)
525 return 1;
526 }
527 return 0;
528 }
529 if (addr1->v6.sin6_port != addr2->v6.sin6_port)
530 return 0;
531 if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr))
532 return 0;
533 /* If this is a linklocal address, compare the scope_id. */
534 if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) {
535 if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id &&
536 (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) {
537 return 0;
538 }
539 }
540
541 return 1;
542}
543
544/* Initialize addr struct to INADDR_ANY. */
545static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port)
546{
547 memset(addr, 0x00, sizeof(union sctp_addr));
548 addr->v6.sin6_family = AF_INET6;
549 addr->v6.sin6_port = port;
550}
551
552/* Is this a wildcard address? */
553static int sctp_v6_is_any(const union sctp_addr *addr)
554{
555 return ipv6_addr_any(&addr->v6.sin6_addr);
556}
557
558/* Should this be available for binding? */
559static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp)
560{
561 int type;
562 const struct in6_addr *in6 = (const struct in6_addr *)&addr->v6.sin6_addr;
563
564 type = ipv6_addr_type(in6);
565 if (IPV6_ADDR_ANY == type)
566 return 1;
567 if (type == IPV6_ADDR_MAPPED) {
568 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
569 return 0;
570 sctp_v6_map_v4(addr);
571 return sctp_get_af_specific(AF_INET)->available(addr, sp);
572 }
573 if (!(type & IPV6_ADDR_UNICAST))
574 return 0;
575
576 return ipv6_chk_addr(sock_net(&sp->inet.sk), in6, NULL, 0);
577}
578
579/* This function checks if the address is a valid address to be used for
580 * SCTP.
581 *
582 * Output:
583 * Return 0 - If the address is a non-unicast or an illegal address.
584 * Return 1 - If the address is a unicast.
585 */
586static int sctp_v6_addr_valid(union sctp_addr *addr,
587 struct sctp_sock *sp,
588 const struct sk_buff *skb)
589{
590 int ret = ipv6_addr_type(&addr->v6.sin6_addr);
591
592 /* Support v4-mapped-v6 address. */
593 if (ret == IPV6_ADDR_MAPPED) {
594 /* Note: This routine is used in input, so v4-mapped-v6
595 * are disallowed here when there is no sctp_sock.
596 */
597 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
598 return 0;
599 sctp_v6_map_v4(addr);
600 return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb);
601 }
602
603 /* Is this a non-unicast address */
604 if (!(ret & IPV6_ADDR_UNICAST))
605 return 0;
606
607 return 1;
608}
609
610/* What is the scope of 'addr'? */
611static sctp_scope_t sctp_v6_scope(union sctp_addr *addr)
612{
613 int v6scope;
614 sctp_scope_t retval;
615
616 /* The IPv6 scope is really a set of bit fields.
617 * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope.
618 */
619
620 v6scope = ipv6_addr_scope(&addr->v6.sin6_addr);
621 switch (v6scope) {
622 case IFA_HOST:
623 retval = SCTP_SCOPE_LOOPBACK;
624 break;
625 case IFA_LINK:
626 retval = SCTP_SCOPE_LINK;
627 break;
628 case IFA_SITE:
629 retval = SCTP_SCOPE_PRIVATE;
630 break;
631 default:
632 retval = SCTP_SCOPE_GLOBAL;
633 break;
634 }
635
636 return retval;
637}
638
639/* Create and initialize a new sk for the socket to be returned by accept(). */
640static struct sock *sctp_v6_create_accept_sk(struct sock *sk,
641 struct sctp_association *asoc)
642{
643 struct sock *newsk;
644 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
645 struct sctp6_sock *newsctp6sk;
646 struct ipv6_txoptions *opt;
647
648 newsk = sk_alloc(sock_net(sk), PF_INET6, GFP_KERNEL, sk->sk_prot, 0);
649 if (!newsk)
650 goto out;
651
652 sock_init_data(NULL, newsk);
653
654 sctp_copy_sock(newsk, sk, asoc);
655 sock_reset_flag(sk, SOCK_ZAPPED);
656
657 newsctp6sk = (struct sctp6_sock *)newsk;
658 inet_sk(newsk)->pinet6 = &newsctp6sk->inet6;
659
660 sctp_sk(newsk)->v4mapped = sctp_sk(sk)->v4mapped;
661
662 newnp = inet6_sk(newsk);
663
664 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
665
666 rcu_read_lock();
667 opt = rcu_dereference(np->opt);
668 if (opt)
669 opt = ipv6_dup_options(newsk, opt);
670 RCU_INIT_POINTER(newnp->opt, opt);
671 rcu_read_unlock();
672
673 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
674 * and getpeername().
675 */
676 sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);
677
678 newsk->sk_v6_rcv_saddr = sk->sk_v6_rcv_saddr;
679
680 sk_refcnt_debug_inc(newsk);
681
682 if (newsk->sk_prot->init(newsk)) {
683 sk_common_release(newsk);
684 newsk = NULL;
685 }
686
687out:
688 return newsk;
689}
690
691/* Format a sockaddr for return to user space. This makes sure the return is
692 * AF_INET or AF_INET6 depending on the SCTP_I_WANT_MAPPED_V4_ADDR option.
693 */
694static int sctp_v6_addr_to_user(struct sctp_sock *sp, union sctp_addr *addr)
695{
696 if (sp->v4mapped) {
697 if (addr->sa.sa_family == AF_INET)
698 sctp_v4_map_v6(addr);
699 } else {
700 if (addr->sa.sa_family == AF_INET6 &&
701 ipv6_addr_v4mapped(&addr->v6.sin6_addr))
702 sctp_v6_map_v4(addr);
703 }
704
705 if (addr->sa.sa_family == AF_INET)
706 return sizeof(struct sockaddr_in);
707 return sizeof(struct sockaddr_in6);
708}
709
710/* Where did this skb come from? */
711static int sctp_v6_skb_iif(const struct sk_buff *skb)
712{
713 struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
714 return opt->iif;
715}
716
717/* Was this packet marked by Explicit Congestion Notification? */
718static int sctp_v6_is_ce(const struct sk_buff *skb)
719{
720 return *((__u32 *)(ipv6_hdr(skb))) & htonl(1 << 20);
721}
722
723/* Dump the v6 addr to the seq file. */
724static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
725{
726 seq_printf(seq, "%pI6 ", &addr->v6.sin6_addr);
727}
728
729static void sctp_v6_ecn_capable(struct sock *sk)
730{
731 inet6_sk(sk)->tclass |= INET_ECN_ECT_0;
732}
733
734/* Initialize a PF_INET msgname from a ulpevent. */
735static void sctp_inet6_event_msgname(struct sctp_ulpevent *event,
736 char *msgname, int *addrlen)
737{
738 union sctp_addr *addr;
739 struct sctp_association *asoc;
740 union sctp_addr *paddr;
741
742 if (!msgname)
743 return;
744
745 addr = (union sctp_addr *)msgname;
746 asoc = event->asoc;
747 paddr = &asoc->peer.primary_addr;
748
749 if (paddr->sa.sa_family == AF_INET) {
750 addr->v4.sin_family = AF_INET;
751 addr->v4.sin_port = htons(asoc->peer.port);
752 addr->v4.sin_addr = paddr->v4.sin_addr;
753 } else {
754 addr->v6.sin6_family = AF_INET6;
755 addr->v6.sin6_flowinfo = 0;
756 if (ipv6_addr_type(&paddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
757 addr->v6.sin6_scope_id = paddr->v6.sin6_scope_id;
758 else
759 addr->v6.sin6_scope_id = 0;
760 addr->v6.sin6_port = htons(asoc->peer.port);
761 addr->v6.sin6_addr = paddr->v6.sin6_addr;
762 }
763
764 *addrlen = sctp_v6_addr_to_user(sctp_sk(asoc->base.sk), addr);
765}
766
767/* Initialize a msg_name from an inbound skb. */
768static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname,
769 int *addr_len)
770{
771 union sctp_addr *addr;
772 struct sctphdr *sh;
773
774 if (!msgname)
775 return;
776
777 addr = (union sctp_addr *)msgname;
778 sh = sctp_hdr(skb);
779
780 if (ip_hdr(skb)->version == 4) {
781 addr->v4.sin_family = AF_INET;
782 addr->v4.sin_port = sh->source;
783 addr->v4.sin_addr.s_addr = ip_hdr(skb)->saddr;
784 } else {
785 addr->v6.sin6_family = AF_INET6;
786 addr->v6.sin6_flowinfo = 0;
787 addr->v6.sin6_port = sh->source;
788 addr->v6.sin6_addr = ipv6_hdr(skb)->saddr;
789 if (ipv6_addr_type(&addr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) {
790 struct sctp_ulpevent *ev = sctp_skb2event(skb);
791 addr->v6.sin6_scope_id = ev->iif;
792 }
793 }
794
795 *addr_len = sctp_v6_addr_to_user(sctp_sk(skb->sk), addr);
796}
797
798/* Do we support this AF? */
799static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp)
800{
801 switch (family) {
802 case AF_INET6:
803 return 1;
804 /* v4-mapped-v6 addresses */
805 case AF_INET:
806 if (!__ipv6_only_sock(sctp_opt2sk(sp)))
807 return 1;
808 default:
809 return 0;
810 }
811}
812
813/* Address matching with wildcards allowed. This extra level
814 * of indirection lets us choose whether a PF_INET6 should
815 * disallow any v4 addresses if we so choose.
816 */
817static int sctp_inet6_cmp_addr(const union sctp_addr *addr1,
818 const union sctp_addr *addr2,
819 struct sctp_sock *opt)
820{
821 struct sctp_af *af1, *af2;
822 struct sock *sk = sctp_opt2sk(opt);
823
824 af1 = sctp_get_af_specific(addr1->sa.sa_family);
825 af2 = sctp_get_af_specific(addr2->sa.sa_family);
826
827 if (!af1 || !af2)
828 return 0;
829
830 /* If the socket is IPv6 only, v4 addrs will not match */
831 if (__ipv6_only_sock(sk) && af1 != af2)
832 return 0;
833
834 /* Today, wildcard AF_INET/AF_INET6. */
835 if (sctp_is_any(sk, addr1) || sctp_is_any(sk, addr2))
836 return 1;
837
838 if (addr1->sa.sa_family != addr2->sa.sa_family)
839 return 0;
840
841 return af1->cmp_addr(addr1, addr2);
842}
843
844/* Verify that the provided sockaddr looks bindable. Common verification,
845 * has already been taken care of.
846 */
847static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
848{
849 struct sctp_af *af;
850
851 /* ASSERT: address family has already been verified. */
852 if (addr->sa.sa_family != AF_INET6)
853 af = sctp_get_af_specific(addr->sa.sa_family);
854 else {
855 int type = ipv6_addr_type(&addr->v6.sin6_addr);
856 struct net_device *dev;
857
858 if (type & IPV6_ADDR_LINKLOCAL) {
859 struct net *net;
860 if (!addr->v6.sin6_scope_id)
861 return 0;
862 net = sock_net(&opt->inet.sk);
863 rcu_read_lock();
864 dev = dev_get_by_index_rcu(net, addr->v6.sin6_scope_id);
865 if (!dev ||
866 !ipv6_chk_addr(net, &addr->v6.sin6_addr, dev, 0)) {
867 rcu_read_unlock();
868 return 0;
869 }
870 rcu_read_unlock();
871 }
872
873 af = opt->pf->af;
874 }
875 return af->available(addr, opt);
876}
877
878/* Verify that the provided sockaddr looks sendable. Common verification,
879 * has already been taken care of.
880 */
881static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
882{
883 struct sctp_af *af = NULL;
884
885 /* ASSERT: address family has already been verified. */
886 if (addr->sa.sa_family != AF_INET6)
887 af = sctp_get_af_specific(addr->sa.sa_family);
888 else {
889 int type = ipv6_addr_type(&addr->v6.sin6_addr);
890 struct net_device *dev;
891
892 if (type & IPV6_ADDR_LINKLOCAL) {
893 if (!addr->v6.sin6_scope_id)
894 return 0;
895 rcu_read_lock();
896 dev = dev_get_by_index_rcu(sock_net(&opt->inet.sk),
897 addr->v6.sin6_scope_id);
898 rcu_read_unlock();
899 if (!dev)
900 return 0;
901 }
902 af = opt->pf->af;
903 }
904
905 return af != NULL;
906}
907
908/* Fill in Supported Address Type information for INIT and INIT-ACK
909 * chunks. Note: In the future, we may want to look at sock options
910 * to determine whether a PF_INET6 socket really wants to have IPV4
911 * addresses.
912 * Returns number of addresses supported.
913 */
914static int sctp_inet6_supported_addrs(const struct sctp_sock *opt,
915 __be16 *types)
916{
917 types[0] = SCTP_PARAM_IPV6_ADDRESS;
918 if (!opt || !ipv6_only_sock(sctp_opt2sk(opt))) {
919 types[1] = SCTP_PARAM_IPV4_ADDRESS;
920 return 2;
921 }
922 return 1;
923}
924
925/* Handle SCTP_I_WANT_MAPPED_V4_ADDR for getpeername() and getsockname() */
926static int sctp_getname(struct socket *sock, struct sockaddr *uaddr,
927 int *uaddr_len, int peer)
928{
929 int rc;
930
931 rc = inet6_getname(sock, uaddr, uaddr_len, peer);
932
933 if (rc != 0)
934 return rc;
935
936 *uaddr_len = sctp_v6_addr_to_user(sctp_sk(sock->sk),
937 (union sctp_addr *)uaddr);
938
939 return rc;
940}
941
942static const struct proto_ops inet6_seqpacket_ops = {
943 .family = PF_INET6,
944 .owner = THIS_MODULE,
945 .release = inet6_release,
946 .bind = inet6_bind,
947 .connect = inet_dgram_connect,
948 .socketpair = sock_no_socketpair,
949 .accept = inet_accept,
950 .getname = sctp_getname,
951 .poll = sctp_poll,
952 .ioctl = inet6_ioctl,
953 .listen = sctp_inet_listen,
954 .shutdown = inet_shutdown,
955 .setsockopt = sock_common_setsockopt,
956 .getsockopt = sock_common_getsockopt,
957 .sendmsg = inet_sendmsg,
958 .recvmsg = sock_common_recvmsg,
959 .mmap = sock_no_mmap,
960#ifdef CONFIG_COMPAT
961 .compat_setsockopt = compat_sock_common_setsockopt,
962 .compat_getsockopt = compat_sock_common_getsockopt,
963#endif
964};
965
966static struct inet_protosw sctpv6_seqpacket_protosw = {
967 .type = SOCK_SEQPACKET,
968 .protocol = IPPROTO_SCTP,
969 .prot = &sctpv6_prot,
970 .ops = &inet6_seqpacket_ops,
971 .flags = SCTP_PROTOSW_FLAG
972};
973static struct inet_protosw sctpv6_stream_protosw = {
974 .type = SOCK_STREAM,
975 .protocol = IPPROTO_SCTP,
976 .prot = &sctpv6_prot,
977 .ops = &inet6_seqpacket_ops,
978 .flags = SCTP_PROTOSW_FLAG,
979};
980
981static int sctp6_rcv(struct sk_buff *skb)
982{
983 return sctp_rcv(skb) ? -1 : 0;
984}
985
986static const struct inet6_protocol sctpv6_protocol = {
987 .handler = sctp6_rcv,
988 .err_handler = sctp_v6_err,
989 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
990};
991
992static struct sctp_af sctp_af_inet6 = {
993 .sa_family = AF_INET6,
994 .sctp_xmit = sctp_v6_xmit,
995 .setsockopt = ipv6_setsockopt,
996 .getsockopt = ipv6_getsockopt,
997 .get_dst = sctp_v6_get_dst,
998 .get_saddr = sctp_v6_get_saddr,
999 .copy_addrlist = sctp_v6_copy_addrlist,
1000 .from_skb = sctp_v6_from_skb,
1001 .from_sk = sctp_v6_from_sk,
1002 .from_addr_param = sctp_v6_from_addr_param,
1003 .to_addr_param = sctp_v6_to_addr_param,
1004 .cmp_addr = sctp_v6_cmp_addr,
1005 .scope = sctp_v6_scope,
1006 .addr_valid = sctp_v6_addr_valid,
1007 .inaddr_any = sctp_v6_inaddr_any,
1008 .is_any = sctp_v6_is_any,
1009 .available = sctp_v6_available,
1010 .skb_iif = sctp_v6_skb_iif,
1011 .is_ce = sctp_v6_is_ce,
1012 .seq_dump_addr = sctp_v6_seq_dump_addr,
1013 .ecn_capable = sctp_v6_ecn_capable,
1014 .net_header_len = sizeof(struct ipv6hdr),
1015 .sockaddr_len = sizeof(struct sockaddr_in6),
1016#ifdef CONFIG_COMPAT
1017 .compat_setsockopt = compat_ipv6_setsockopt,
1018 .compat_getsockopt = compat_ipv6_getsockopt,
1019#endif
1020};
1021
1022static struct sctp_pf sctp_pf_inet6 = {
1023 .event_msgname = sctp_inet6_event_msgname,
1024 .skb_msgname = sctp_inet6_skb_msgname,
1025 .af_supported = sctp_inet6_af_supported,
1026 .cmp_addr = sctp_inet6_cmp_addr,
1027 .bind_verify = sctp_inet6_bind_verify,
1028 .send_verify = sctp_inet6_send_verify,
1029 .supported_addrs = sctp_inet6_supported_addrs,
1030 .create_accept_sk = sctp_v6_create_accept_sk,
1031 .addr_to_user = sctp_v6_addr_to_user,
1032 .to_sk_saddr = sctp_v6_to_sk_saddr,
1033 .to_sk_daddr = sctp_v6_to_sk_daddr,
1034 .af = &sctp_af_inet6,
1035};
1036
1037/* Initialize IPv6 support and register with socket layer. */
1038void sctp_v6_pf_init(void)
1039{
1040 /* Register the SCTP specific PF_INET6 functions. */
1041 sctp_register_pf(&sctp_pf_inet6, PF_INET6);
1042
1043 /* Register the SCTP specific AF_INET6 functions. */
1044 sctp_register_af(&sctp_af_inet6);
1045}
1046
1047void sctp_v6_pf_exit(void)
1048{
1049 list_del(&sctp_af_inet6.list);
1050}
1051
1052/* Initialize IPv6 support and register with socket layer. */
1053int sctp_v6_protosw_init(void)
1054{
1055 int rc;
1056
1057 rc = proto_register(&sctpv6_prot, 1);
1058 if (rc)
1059 return rc;
1060
1061 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
1062 inet6_register_protosw(&sctpv6_seqpacket_protosw);
1063 inet6_register_protosw(&sctpv6_stream_protosw);
1064
1065 return 0;
1066}
1067
1068void sctp_v6_protosw_exit(void)
1069{
1070 inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
1071 inet6_unregister_protosw(&sctpv6_stream_protosw);
1072 proto_unregister(&sctpv6_prot);
1073}
1074
1075
1076/* Register with inet6 layer. */
1077int sctp_v6_add_protocol(void)
1078{
1079 /* Register notifier for inet6 address additions/deletions. */
1080 register_inet6addr_notifier(&sctp_inet6addr_notifier);
1081
1082 if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0)
1083 return -EAGAIN;
1084
1085 return 0;
1086}
1087
1088/* Unregister with inet6 layer. */
1089void sctp_v6_del_protocol(void)
1090{
1091 inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP);
1092 unregister_inet6addr_notifier(&sctp_inet6addr_notifier);
1093}