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50#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
51
52#include <linux/module.h>
53#include <linux/errno.h>
54#include <linux/types.h>
55#include <linux/socket.h>
56#include <linux/sockios.h>
57#include <linux/net.h>
58#include <linux/in.h>
59#include <linux/in6.h>
60#include <linux/netdevice.h>
61#include <linux/init.h>
62#include <linux/ipsec.h>
63#include <linux/slab.h>
64
65#include <linux/ipv6.h>
66#include <linux/icmpv6.h>
67#include <linux/random.h>
68#include <linux/seq_file.h>
69
70#include <net/protocol.h>
71#include <net/ndisc.h>
72#include <net/ip.h>
73#include <net/ipv6.h>
74#include <net/transp_v6.h>
75#include <net/addrconf.h>
76#include <net/ip6_route.h>
77#include <net/inet_common.h>
78#include <net/inet_ecn.h>
79#include <net/sctp/sctp.h>
80
81#include <asm/uaccess.h>
82
83static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
84 union sctp_addr *s2);
85static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr,
86 __be16 port);
87static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
88 const union sctp_addr *addr2);
89
90
91
92
93
94
95
96static int sctp_inet6addr_event(struct notifier_block *this, unsigned long ev,
97 void *ptr)
98{
99 struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
100 struct sctp_sockaddr_entry *addr = NULL;
101 struct sctp_sockaddr_entry *temp;
102 struct net *net = dev_net(ifa->idev->dev);
103 int found = 0;
104
105 switch (ev) {
106 case NETDEV_UP:
107 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
108 if (addr) {
109 addr->a.v6.sin6_family = AF_INET6;
110 addr->a.v6.sin6_port = 0;
111 addr->a.v6.sin6_addr = ifa->addr;
112 addr->a.v6.sin6_scope_id = ifa->idev->dev->ifindex;
113 addr->valid = 1;
114 spin_lock_bh(&net->sctp.local_addr_lock);
115 list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
116 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
117 spin_unlock_bh(&net->sctp.local_addr_lock);
118 }
119 break;
120 case NETDEV_DOWN:
121 spin_lock_bh(&net->sctp.local_addr_lock);
122 list_for_each_entry_safe(addr, temp,
123 &net->sctp.local_addr_list, list) {
124 if (addr->a.sa.sa_family == AF_INET6 &&
125 ipv6_addr_equal(&addr->a.v6.sin6_addr,
126 &ifa->addr)) {
127 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
128 found = 1;
129 addr->valid = 0;
130 list_del_rcu(&addr->list);
131 break;
132 }
133 }
134 spin_unlock_bh(&net->sctp.local_addr_lock);
135 if (found)
136 kfree_rcu(addr, rcu);
137 break;
138 }
139
140 return NOTIFY_DONE;
141}
142
143static struct notifier_block sctp_inet6addr_notifier = {
144 .notifier_call = sctp_inet6addr_event,
145};
146
147
148SCTP_STATIC void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
149 u8 type, u8 code, int offset, __be32 info)
150{
151 struct inet6_dev *idev;
152 struct sock *sk;
153 struct sctp_association *asoc;
154 struct sctp_transport *transport;
155 struct ipv6_pinfo *np;
156 sk_buff_data_t saveip, savesctp;
157 int err;
158 struct net *net = dev_net(skb->dev);
159
160 idev = in6_dev_get(skb->dev);
161
162
163 saveip = skb->network_header;
164 savesctp = skb->transport_header;
165 skb_reset_network_header(skb);
166 skb_set_transport_header(skb, offset);
167 sk = sctp_err_lookup(net, AF_INET6, skb, sctp_hdr(skb), &asoc, &transport);
168
169 skb->network_header = saveip;
170 skb->transport_header = savesctp;
171 if (!sk) {
172 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_INERRORS);
173 goto out;
174 }
175
176
177
178
179
180 switch (type) {
181 case ICMPV6_PKT_TOOBIG:
182 sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info));
183 goto out_unlock;
184 case ICMPV6_PARAMPROB:
185 if (ICMPV6_UNK_NEXTHDR == code) {
186 sctp_icmp_proto_unreachable(sk, asoc, transport);
187 goto out_unlock;
188 }
189 break;
190 case NDISC_REDIRECT:
191 sctp_icmp_redirect(sk, transport, skb);
192 break;
193 default:
194 break;
195 }
196
197 np = inet6_sk(sk);
198 icmpv6_err_convert(type, code, &err);
199 if (!sock_owned_by_user(sk) && np->recverr) {
200 sk->sk_err = err;
201 sk->sk_error_report(sk);
202 } else {
203 sk->sk_err_soft = err;
204 }
205
206out_unlock:
207 sctp_err_finish(sk, asoc);
208out:
209 if (likely(idev != NULL))
210 in6_dev_put(idev);
211}
212
213
214static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport)
215{
216 struct sock *sk = skb->sk;
217 struct ipv6_pinfo *np = inet6_sk(sk);
218 struct flowi6 fl6;
219
220 memset(&fl6, 0, sizeof(fl6));
221
222 fl6.flowi6_proto = sk->sk_protocol;
223
224
225
226
227 fl6.daddr = transport->ipaddr.v6.sin6_addr;
228 fl6.saddr = transport->saddr.v6.sin6_addr;
229
230 fl6.flowlabel = np->flow_label;
231 IP6_ECN_flow_xmit(sk, fl6.flowlabel);
232 if (ipv6_addr_type(&fl6.saddr) & IPV6_ADDR_LINKLOCAL)
233 fl6.flowi6_oif = transport->saddr.v6.sin6_scope_id;
234 else
235 fl6.flowi6_oif = sk->sk_bound_dev_if;
236
237 if (np->opt && np->opt->srcrt) {
238 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
239 fl6.daddr = *rt0->addr;
240 }
241
242 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n",
243 __func__, skb, skb->len,
244 &fl6.saddr, &fl6.daddr);
245
246 SCTP_INC_STATS(sock_net(sk), SCTP_MIB_OUTSCTPPACKS);
247
248 if (!(transport->param_flags & SPP_PMTUD_ENABLE))
249 skb->local_df = 1;
250
251 return ip6_xmit(sk, skb, &fl6, np->opt, np->tclass);
252}
253
254
255
256
257static void sctp_v6_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
258 struct flowi *fl, struct sock *sk)
259{
260 struct sctp_association *asoc = t->asoc;
261 struct dst_entry *dst = NULL;
262 struct flowi6 *fl6 = &fl->u.ip6;
263 struct sctp_bind_addr *bp;
264 struct sctp_sockaddr_entry *laddr;
265 union sctp_addr *baddr = NULL;
266 union sctp_addr *daddr = &t->ipaddr;
267 union sctp_addr dst_saddr;
268 __u8 matchlen = 0;
269 __u8 bmatchlen;
270 sctp_scope_t scope;
271
272 memset(fl6, 0, sizeof(struct flowi6));
273 fl6->daddr = daddr->v6.sin6_addr;
274 fl6->fl6_dport = daddr->v6.sin6_port;
275 fl6->flowi6_proto = IPPROTO_SCTP;
276 if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
277 fl6->flowi6_oif = daddr->v6.sin6_scope_id;
278
279 SCTP_DEBUG_PRINTK("%s: DST=%pI6 ", __func__, &fl6->daddr);
280
281 if (asoc)
282 fl6->fl6_sport = htons(asoc->base.bind_addr.port);
283
284 if (saddr) {
285 fl6->saddr = saddr->v6.sin6_addr;
286 fl6->fl6_sport = saddr->v6.sin6_port;
287 SCTP_DEBUG_PRINTK("SRC=%pI6 - ", &fl6->saddr);
288 }
289
290 dst = ip6_dst_lookup_flow(sk, fl6, NULL, false);
291 if (!asoc || saddr)
292 goto out;
293
294 bp = &asoc->base.bind_addr;
295 scope = sctp_scope(daddr);
296
297
298
299 if (!IS_ERR(dst)) {
300
301
302
303 sctp_v6_to_addr(&dst_saddr, &fl6->saddr, htons(bp->port));
304 rcu_read_lock();
305 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
306 if (!laddr->valid || (laddr->state != SCTP_ADDR_SRC))
307 continue;
308
309
310 if ((laddr->a.sa.sa_family == AF_INET6) &&
311 (sctp_v6_cmp_addr(&dst_saddr, &laddr->a))) {
312 rcu_read_unlock();
313 goto out;
314 }
315 }
316 rcu_read_unlock();
317
318
319
320 dst_release(dst);
321 dst = NULL;
322 }
323
324
325
326
327 rcu_read_lock();
328 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
329 if (!laddr->valid)
330 continue;
331 if ((laddr->state == SCTP_ADDR_SRC) &&
332 (laddr->a.sa.sa_family == AF_INET6) &&
333 (scope <= sctp_scope(&laddr->a))) {
334 bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a);
335 if (!baddr || (matchlen < bmatchlen)) {
336 baddr = &laddr->a;
337 matchlen = bmatchlen;
338 }
339 }
340 }
341 rcu_read_unlock();
342 if (baddr) {
343 fl6->saddr = baddr->v6.sin6_addr;
344 fl6->fl6_sport = baddr->v6.sin6_port;
345 dst = ip6_dst_lookup_flow(sk, fl6, NULL, false);
346 }
347
348out:
349 if (!IS_ERR_OR_NULL(dst)) {
350 struct rt6_info *rt;
351 rt = (struct rt6_info *)dst;
352 t->dst = dst;
353 SCTP_DEBUG_PRINTK("rt6_dst:%pI6 rt6_src:%pI6\n",
354 &rt->rt6i_dst.addr, &fl6->saddr);
355 } else {
356 t->dst = NULL;
357 SCTP_DEBUG_PRINTK("NO ROUTE\n");
358 }
359}
360
361
362
363
364static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
365 union sctp_addr *s2)
366{
367 return ipv6_addr_diff(&s1->v6.sin6_addr, &s2->v6.sin6_addr);
368}
369
370
371
372
373static void sctp_v6_get_saddr(struct sctp_sock *sk,
374 struct sctp_transport *t,
375 struct flowi *fl)
376{
377 struct flowi6 *fl6 = &fl->u.ip6;
378 union sctp_addr *saddr = &t->saddr;
379
380 SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p\n", __func__, t->asoc, t->dst);
381
382 if (t->dst) {
383 saddr->v6.sin6_family = AF_INET6;
384 saddr->v6.sin6_addr = fl6->saddr;
385 }
386}
387
388
389static void sctp_v6_copy_addrlist(struct list_head *addrlist,
390 struct net_device *dev)
391{
392 struct inet6_dev *in6_dev;
393 struct inet6_ifaddr *ifp;
394 struct sctp_sockaddr_entry *addr;
395
396 rcu_read_lock();
397 if ((in6_dev = __in6_dev_get(dev)) == NULL) {
398 rcu_read_unlock();
399 return;
400 }
401
402 read_lock_bh(&in6_dev->lock);
403 list_for_each_entry(ifp, &in6_dev->addr_list, if_list) {
404
405 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
406 if (addr) {
407 addr->a.v6.sin6_family = AF_INET6;
408 addr->a.v6.sin6_port = 0;
409 addr->a.v6.sin6_addr = ifp->addr;
410 addr->a.v6.sin6_scope_id = dev->ifindex;
411 addr->valid = 1;
412 INIT_LIST_HEAD(&addr->list);
413 list_add_tail(&addr->list, addrlist);
414 }
415 }
416
417 read_unlock_bh(&in6_dev->lock);
418 rcu_read_unlock();
419}
420
421
422static void sctp_v6_from_skb(union sctp_addr *addr,struct sk_buff *skb,
423 int is_saddr)
424{
425 __be16 *port;
426 struct sctphdr *sh;
427
428 port = &addr->v6.sin6_port;
429 addr->v6.sin6_family = AF_INET6;
430 addr->v6.sin6_flowinfo = 0;
431 addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif;
432
433 sh = sctp_hdr(skb);
434 if (is_saddr) {
435 *port = sh->source;
436 addr->v6.sin6_addr = ipv6_hdr(skb)->saddr;
437 } else {
438 *port = sh->dest;
439 addr->v6.sin6_addr = ipv6_hdr(skb)->daddr;
440 }
441}
442
443
444static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk)
445{
446 addr->v6.sin6_family = AF_INET6;
447 addr->v6.sin6_port = 0;
448 addr->v6.sin6_addr = inet6_sk(sk)->rcv_saddr;
449}
450
451
452static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
453{
454 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
455 inet6_sk(sk)->rcv_saddr.s6_addr32[0] = 0;
456 inet6_sk(sk)->rcv_saddr.s6_addr32[1] = 0;
457 inet6_sk(sk)->rcv_saddr.s6_addr32[2] = htonl(0x0000ffff);
458 inet6_sk(sk)->rcv_saddr.s6_addr32[3] =
459 addr->v4.sin_addr.s_addr;
460 } else {
461 inet6_sk(sk)->rcv_saddr = addr->v6.sin6_addr;
462 }
463}
464
465
466static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
467{
468 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
469 inet6_sk(sk)->daddr.s6_addr32[0] = 0;
470 inet6_sk(sk)->daddr.s6_addr32[1] = 0;
471 inet6_sk(sk)->daddr.s6_addr32[2] = htonl(0x0000ffff);
472 inet6_sk(sk)->daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
473 } else {
474 inet6_sk(sk)->daddr = addr->v6.sin6_addr;
475 }
476}
477
478
479static void sctp_v6_from_addr_param(union sctp_addr *addr,
480 union sctp_addr_param *param,
481 __be16 port, int iif)
482{
483 addr->v6.sin6_family = AF_INET6;
484 addr->v6.sin6_port = port;
485 addr->v6.sin6_flowinfo = 0;
486 addr->v6.sin6_addr = param->v6.addr;
487 addr->v6.sin6_scope_id = iif;
488}
489
490
491
492
493static int sctp_v6_to_addr_param(const union sctp_addr *addr,
494 union sctp_addr_param *param)
495{
496 int length = sizeof(sctp_ipv6addr_param_t);
497
498 param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS;
499 param->v6.param_hdr.length = htons(length);
500 param->v6.addr = addr->v6.sin6_addr;
501
502 return length;
503}
504
505
506static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr,
507 __be16 port)
508{
509 addr->sa.sa_family = AF_INET6;
510 addr->v6.sin6_port = port;
511 addr->v6.sin6_addr = *saddr;
512}
513
514
515
516
517static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
518 const union sctp_addr *addr2)
519{
520 if (addr1->sa.sa_family != addr2->sa.sa_family) {
521 if (addr1->sa.sa_family == AF_INET &&
522 addr2->sa.sa_family == AF_INET6 &&
523 ipv6_addr_v4mapped(&addr2->v6.sin6_addr)) {
524 if (addr2->v6.sin6_port == addr1->v4.sin_port &&
525 addr2->v6.sin6_addr.s6_addr32[3] ==
526 addr1->v4.sin_addr.s_addr)
527 return 1;
528 }
529 if (addr2->sa.sa_family == AF_INET &&
530 addr1->sa.sa_family == AF_INET6 &&
531 ipv6_addr_v4mapped(&addr1->v6.sin6_addr)) {
532 if (addr1->v6.sin6_port == addr2->v4.sin_port &&
533 addr1->v6.sin6_addr.s6_addr32[3] ==
534 addr2->v4.sin_addr.s_addr)
535 return 1;
536 }
537 return 0;
538 }
539 if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr))
540 return 0;
541
542 if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) {
543 if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id &&
544 (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) {
545 return 0;
546 }
547 }
548
549 return 1;
550}
551
552
553static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port)
554{
555 memset(addr, 0x00, sizeof(union sctp_addr));
556 addr->v6.sin6_family = AF_INET6;
557 addr->v6.sin6_port = port;
558}
559
560
561static int sctp_v6_is_any(const union sctp_addr *addr)
562{
563 return ipv6_addr_any(&addr->v6.sin6_addr);
564}
565
566
567static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp)
568{
569 int type;
570 const struct in6_addr *in6 = (const struct in6_addr *)&addr->v6.sin6_addr;
571
572 type = ipv6_addr_type(in6);
573 if (IPV6_ADDR_ANY == type)
574 return 1;
575 if (type == IPV6_ADDR_MAPPED) {
576 if (sp && !sp->v4mapped)
577 return 0;
578 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
579 return 0;
580 sctp_v6_map_v4(addr);
581 return sctp_get_af_specific(AF_INET)->available(addr, sp);
582 }
583 if (!(type & IPV6_ADDR_UNICAST))
584 return 0;
585
586 return ipv6_chk_addr(sock_net(&sp->inet.sk), in6, NULL, 0);
587}
588
589
590
591
592
593
594
595
596static int sctp_v6_addr_valid(union sctp_addr *addr,
597 struct sctp_sock *sp,
598 const struct sk_buff *skb)
599{
600 int ret = ipv6_addr_type(&addr->v6.sin6_addr);
601
602
603 if (ret == IPV6_ADDR_MAPPED) {
604
605
606
607 if (!sp || !sp->v4mapped)
608 return 0;
609 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
610 return 0;
611 sctp_v6_map_v4(addr);
612 return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb);
613 }
614
615
616 if (!(ret & IPV6_ADDR_UNICAST))
617 return 0;
618
619 return 1;
620}
621
622
623static sctp_scope_t sctp_v6_scope(union sctp_addr *addr)
624{
625 int v6scope;
626 sctp_scope_t retval;
627
628
629
630
631
632 v6scope = ipv6_addr_scope(&addr->v6.sin6_addr);
633 switch (v6scope) {
634 case IFA_HOST:
635 retval = SCTP_SCOPE_LOOPBACK;
636 break;
637 case IFA_LINK:
638 retval = SCTP_SCOPE_LINK;
639 break;
640 case IFA_SITE:
641 retval = SCTP_SCOPE_PRIVATE;
642 break;
643 default:
644 retval = SCTP_SCOPE_GLOBAL;
645 break;
646 }
647
648 return retval;
649}
650
651
652static struct sock *sctp_v6_create_accept_sk(struct sock *sk,
653 struct sctp_association *asoc)
654{
655 struct sock *newsk;
656 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
657 struct sctp6_sock *newsctp6sk;
658
659 newsk = sk_alloc(sock_net(sk), PF_INET6, GFP_KERNEL, sk->sk_prot);
660 if (!newsk)
661 goto out;
662
663 sock_init_data(NULL, newsk);
664
665 sctp_copy_sock(newsk, sk, asoc);
666 sock_reset_flag(sk, SOCK_ZAPPED);
667
668 newsctp6sk = (struct sctp6_sock *)newsk;
669 inet_sk(newsk)->pinet6 = &newsctp6sk->inet6;
670
671 sctp_sk(newsk)->v4mapped = sctp_sk(sk)->v4mapped;
672
673 newnp = inet6_sk(newsk);
674
675 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
676
677
678
679
680 sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);
681
682 sk_refcnt_debug_inc(newsk);
683
684 if (newsk->sk_prot->init(newsk)) {
685 sk_common_release(newsk);
686 newsk = NULL;
687 }
688
689out:
690 return newsk;
691}
692
693
694static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
695{
696 if (sp->v4mapped && AF_INET == addr->sa.sa_family)
697 sctp_v4_map_v6(addr);
698}
699
700
701static int sctp_v6_skb_iif(const struct sk_buff *skb)
702{
703 struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
704 return opt->iif;
705}
706
707
708static int sctp_v6_is_ce(const struct sk_buff *skb)
709{
710 return *((__u32 *)(ipv6_hdr(skb))) & htonl(1 << 20);
711}
712
713
714static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
715{
716 seq_printf(seq, "%pI6 ", &addr->v6.sin6_addr);
717}
718
719static void sctp_v6_ecn_capable(struct sock *sk)
720{
721 inet6_sk(sk)->tclass |= INET_ECN_ECT_0;
722}
723
724
725static void sctp_inet6_msgname(char *msgname, int *addr_len)
726{
727 struct sockaddr_in6 *sin6;
728
729 sin6 = (struct sockaddr_in6 *)msgname;
730 sin6->sin6_family = AF_INET6;
731 sin6->sin6_flowinfo = 0;
732 sin6->sin6_scope_id = 0;
733 *addr_len = sizeof(struct sockaddr_in6);
734}
735
736
737static void sctp_inet6_event_msgname(struct sctp_ulpevent *event,
738 char *msgname, int *addrlen)
739{
740 struct sockaddr_in6 *sin6, *sin6from;
741
742 if (msgname) {
743 union sctp_addr *addr;
744 struct sctp_association *asoc;
745
746 asoc = event->asoc;
747 sctp_inet6_msgname(msgname, addrlen);
748 sin6 = (struct sockaddr_in6 *)msgname;
749 sin6->sin6_port = htons(asoc->peer.port);
750 addr = &asoc->peer.primary_addr;
751
752
753
754
755
756
757 if (sctp_sk(asoc->base.sk)->v4mapped &&
758 AF_INET == addr->sa.sa_family) {
759 sctp_v4_map_v6((union sctp_addr *)sin6);
760 sin6->sin6_addr.s6_addr32[3] =
761 addr->v4.sin_addr.s_addr;
762 return;
763 }
764
765 sin6from = &asoc->peer.primary_addr.v6;
766 sin6->sin6_addr = sin6from->sin6_addr;
767 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
768 sin6->sin6_scope_id = sin6from->sin6_scope_id;
769 }
770}
771
772
773static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname,
774 int *addr_len)
775{
776 struct sctphdr *sh;
777 struct sockaddr_in6 *sin6;
778
779 if (msgname) {
780 sctp_inet6_msgname(msgname, addr_len);
781 sin6 = (struct sockaddr_in6 *)msgname;
782 sh = sctp_hdr(skb);
783 sin6->sin6_port = sh->source;
784
785
786 if (sctp_sk(skb->sk)->v4mapped &&
787 ip_hdr(skb)->version == 4) {
788 sctp_v4_map_v6((union sctp_addr *)sin6);
789 sin6->sin6_addr.s6_addr32[3] = ip_hdr(skb)->saddr;
790 return;
791 }
792
793
794 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
795 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) {
796 struct sctp_ulpevent *ev = sctp_skb2event(skb);
797 sin6->sin6_scope_id = ev->iif;
798 }
799 }
800}
801
802
803static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp)
804{
805 switch (family) {
806 case AF_INET6:
807 return 1;
808
809 case AF_INET:
810 if (!__ipv6_only_sock(sctp_opt2sk(sp)))
811 return 1;
812 default:
813 return 0;
814 }
815}
816
817
818
819
820
821static int sctp_inet6_cmp_addr(const union sctp_addr *addr1,
822 const union sctp_addr *addr2,
823 struct sctp_sock *opt)
824{
825 struct sctp_af *af1, *af2;
826 struct sock *sk = sctp_opt2sk(opt);
827
828 af1 = sctp_get_af_specific(addr1->sa.sa_family);
829 af2 = sctp_get_af_specific(addr2->sa.sa_family);
830
831 if (!af1 || !af2)
832 return 0;
833
834
835 if (__ipv6_only_sock(sk) && af1 != af2)
836 return 0;
837
838
839 if (sctp_is_any(sk, addr1) || sctp_is_any(sk, addr2))
840 return 1;
841
842 if (addr1->sa.sa_family != addr2->sa.sa_family)
843 return 0;
844
845 return af1->cmp_addr(addr1, addr2);
846}
847
848
849
850
851static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
852{
853 struct sctp_af *af;
854
855
856 if (addr->sa.sa_family != AF_INET6)
857 af = sctp_get_af_specific(addr->sa.sa_family);
858 else {
859 int type = ipv6_addr_type(&addr->v6.sin6_addr);
860 struct net_device *dev;
861
862 if (type & IPV6_ADDR_LINKLOCAL) {
863 struct net *net;
864 if (!addr->v6.sin6_scope_id)
865 return 0;
866 net = sock_net(&opt->inet.sk);
867 rcu_read_lock();
868 dev = dev_get_by_index_rcu(net, addr->v6.sin6_scope_id);
869 if (!dev ||
870 !ipv6_chk_addr(net, &addr->v6.sin6_addr, dev, 0)) {
871 rcu_read_unlock();
872 return 0;
873 }
874 rcu_read_unlock();
875 } else if (type == IPV6_ADDR_MAPPED) {
876 if (!opt->v4mapped)
877 return 0;
878 }
879
880 af = opt->pf->af;
881 }
882 return af->available(addr, opt);
883}
884
885
886
887
888static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
889{
890 struct sctp_af *af = NULL;
891
892
893 if (addr->sa.sa_family != AF_INET6)
894 af = sctp_get_af_specific(addr->sa.sa_family);
895 else {
896 int type = ipv6_addr_type(&addr->v6.sin6_addr);
897 struct net_device *dev;
898
899 if (type & IPV6_ADDR_LINKLOCAL) {
900 if (!addr->v6.sin6_scope_id)
901 return 0;
902 rcu_read_lock();
903 dev = dev_get_by_index_rcu(sock_net(&opt->inet.sk),
904 addr->v6.sin6_scope_id);
905 rcu_read_unlock();
906 if (!dev)
907 return 0;
908 }
909 af = opt->pf->af;
910 }
911
912 return af != NULL;
913}
914
915
916
917
918
919
920
921static int sctp_inet6_supported_addrs(const struct sctp_sock *opt,
922 __be16 *types)
923{
924 types[0] = SCTP_PARAM_IPV6_ADDRESS;
925 if (!opt || !ipv6_only_sock(sctp_opt2sk(opt))) {
926 types[1] = SCTP_PARAM_IPV4_ADDRESS;
927 return 2;
928 }
929 return 1;
930}
931
932static const struct proto_ops inet6_seqpacket_ops = {
933 .family = PF_INET6,
934 .owner = THIS_MODULE,
935 .release = inet6_release,
936 .bind = inet6_bind,
937 .connect = inet_dgram_connect,
938 .socketpair = sock_no_socketpair,
939 .accept = inet_accept,
940 .getname = inet6_getname,
941 .poll = sctp_poll,
942 .ioctl = inet6_ioctl,
943 .listen = sctp_inet_listen,
944 .shutdown = inet_shutdown,
945 .setsockopt = sock_common_setsockopt,
946 .getsockopt = sock_common_getsockopt,
947 .sendmsg = inet_sendmsg,
948 .recvmsg = sock_common_recvmsg,
949 .mmap = sock_no_mmap,
950#ifdef CONFIG_COMPAT
951 .compat_setsockopt = compat_sock_common_setsockopt,
952 .compat_getsockopt = compat_sock_common_getsockopt,
953#endif
954};
955
956static struct inet_protosw sctpv6_seqpacket_protosw = {
957 .type = SOCK_SEQPACKET,
958 .protocol = IPPROTO_SCTP,
959 .prot = &sctpv6_prot,
960 .ops = &inet6_seqpacket_ops,
961 .no_check = 0,
962 .flags = SCTP_PROTOSW_FLAG
963};
964static struct inet_protosw sctpv6_stream_protosw = {
965 .type = SOCK_STREAM,
966 .protocol = IPPROTO_SCTP,
967 .prot = &sctpv6_prot,
968 .ops = &inet6_seqpacket_ops,
969 .no_check = 0,
970 .flags = SCTP_PROTOSW_FLAG,
971};
972
973static int sctp6_rcv(struct sk_buff *skb)
974{
975 return sctp_rcv(skb) ? -1 : 0;
976}
977
978static const struct inet6_protocol sctpv6_protocol = {
979 .handler = sctp6_rcv,
980 .err_handler = sctp_v6_err,
981 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
982};
983
984static struct sctp_af sctp_af_inet6 = {
985 .sa_family = AF_INET6,
986 .sctp_xmit = sctp_v6_xmit,
987 .setsockopt = ipv6_setsockopt,
988 .getsockopt = ipv6_getsockopt,
989 .get_dst = sctp_v6_get_dst,
990 .get_saddr = sctp_v6_get_saddr,
991 .copy_addrlist = sctp_v6_copy_addrlist,
992 .from_skb = sctp_v6_from_skb,
993 .from_sk = sctp_v6_from_sk,
994 .to_sk_saddr = sctp_v6_to_sk_saddr,
995 .to_sk_daddr = sctp_v6_to_sk_daddr,
996 .from_addr_param = sctp_v6_from_addr_param,
997 .to_addr_param = sctp_v6_to_addr_param,
998 .cmp_addr = sctp_v6_cmp_addr,
999 .scope = sctp_v6_scope,
1000 .addr_valid = sctp_v6_addr_valid,
1001 .inaddr_any = sctp_v6_inaddr_any,
1002 .is_any = sctp_v6_is_any,
1003 .available = sctp_v6_available,
1004 .skb_iif = sctp_v6_skb_iif,
1005 .is_ce = sctp_v6_is_ce,
1006 .seq_dump_addr = sctp_v6_seq_dump_addr,
1007 .ecn_capable = sctp_v6_ecn_capable,
1008 .net_header_len = sizeof(struct ipv6hdr),
1009 .sockaddr_len = sizeof(struct sockaddr_in6),
1010#ifdef CONFIG_COMPAT
1011 .compat_setsockopt = compat_ipv6_setsockopt,
1012 .compat_getsockopt = compat_ipv6_getsockopt,
1013#endif
1014};
1015
1016static struct sctp_pf sctp_pf_inet6 = {
1017 .event_msgname = sctp_inet6_event_msgname,
1018 .skb_msgname = sctp_inet6_skb_msgname,
1019 .af_supported = sctp_inet6_af_supported,
1020 .cmp_addr = sctp_inet6_cmp_addr,
1021 .bind_verify = sctp_inet6_bind_verify,
1022 .send_verify = sctp_inet6_send_verify,
1023 .supported_addrs = sctp_inet6_supported_addrs,
1024 .create_accept_sk = sctp_v6_create_accept_sk,
1025 .addr_v4map = sctp_v6_addr_v4map,
1026 .af = &sctp_af_inet6,
1027};
1028
1029
1030void sctp_v6_pf_init(void)
1031{
1032
1033 sctp_register_pf(&sctp_pf_inet6, PF_INET6);
1034
1035
1036 sctp_register_af(&sctp_af_inet6);
1037}
1038
1039void sctp_v6_pf_exit(void)
1040{
1041 list_del(&sctp_af_inet6.list);
1042}
1043
1044
1045int sctp_v6_protosw_init(void)
1046{
1047 int rc;
1048
1049 rc = proto_register(&sctpv6_prot, 1);
1050 if (rc)
1051 return rc;
1052
1053
1054 inet6_register_protosw(&sctpv6_seqpacket_protosw);
1055 inet6_register_protosw(&sctpv6_stream_protosw);
1056
1057 return 0;
1058}
1059
1060void sctp_v6_protosw_exit(void)
1061{
1062 inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
1063 inet6_unregister_protosw(&sctpv6_stream_protosw);
1064 proto_unregister(&sctpv6_prot);
1065}
1066
1067
1068
1069int sctp_v6_add_protocol(void)
1070{
1071
1072 register_inet6addr_notifier(&sctp_inet6addr_notifier);
1073
1074 if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0)
1075 return -EAGAIN;
1076
1077 return 0;
1078}
1079
1080
1081void sctp_v6_del_protocol(void)
1082{
1083 inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP);
1084 unregister_inet6addr_notifier(&sctp_inet6addr_notifier);
1085}
1086