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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
148static 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 __u16 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 pr_debug("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n", __func__, skb,
243 skb->len, &fl6.saddr, &fl6.daddr);
244
245 SCTP_INC_STATS(sock_net(sk), SCTP_MIB_OUTSCTPPACKS);
246
247 if (!(transport->param_flags & SPP_PMTUD_ENABLE))
248 skb->local_df = 1;
249
250 return ip6_xmit(sk, skb, &fl6, np->opt, np->tclass);
251}
252
253
254
255
256static void sctp_v6_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
257 struct flowi *fl, struct sock *sk)
258{
259 struct sctp_association *asoc = t->asoc;
260 struct dst_entry *dst = NULL;
261 struct flowi6 *fl6 = &fl->u.ip6;
262 struct sctp_bind_addr *bp;
263 struct sctp_sockaddr_entry *laddr;
264 union sctp_addr *baddr = NULL;
265 union sctp_addr *daddr = &t->ipaddr;
266 union sctp_addr dst_saddr;
267 __u8 matchlen = 0;
268 __u8 bmatchlen;
269 sctp_scope_t scope;
270
271 memset(fl6, 0, sizeof(struct flowi6));
272 fl6->daddr = daddr->v6.sin6_addr;
273 fl6->fl6_dport = daddr->v6.sin6_port;
274 fl6->flowi6_proto = IPPROTO_SCTP;
275 if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
276 fl6->flowi6_oif = daddr->v6.sin6_scope_id;
277
278 pr_debug("%s: dst=%pI6 ", __func__, &fl6->daddr);
279
280 if (asoc)
281 fl6->fl6_sport = htons(asoc->base.bind_addr.port);
282
283 if (saddr) {
284 fl6->saddr = saddr->v6.sin6_addr;
285 fl6->fl6_sport = saddr->v6.sin6_port;
286
287 pr_debug("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
352 rt = (struct rt6_info *)dst;
353 t->dst = dst;
354
355 pr_debug("rt6_dst:%pI6 rt6_src:%pI6\n", &rt->rt6i_dst.addr,
356 &fl6->saddr);
357 } else {
358 t->dst = NULL;
359
360 pr_debug("no route\n");
361 }
362}
363
364
365
366
367static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
368 union sctp_addr *s2)
369{
370 return ipv6_addr_diff(&s1->v6.sin6_addr, &s2->v6.sin6_addr);
371}
372
373
374
375
376static void sctp_v6_get_saddr(struct sctp_sock *sk,
377 struct sctp_transport *t,
378 struct flowi *fl)
379{
380 struct flowi6 *fl6 = &fl->u.ip6;
381 union sctp_addr *saddr = &t->saddr;
382
383 pr_debug("%s: asoc:%p dst:%p\n", __func__, t->asoc, t->dst);
384
385 if (t->dst) {
386 saddr->v6.sin6_family = AF_INET6;
387 saddr->v6.sin6_addr = fl6->saddr;
388 }
389}
390
391
392static void sctp_v6_copy_addrlist(struct list_head *addrlist,
393 struct net_device *dev)
394{
395 struct inet6_dev *in6_dev;
396 struct inet6_ifaddr *ifp;
397 struct sctp_sockaddr_entry *addr;
398
399 rcu_read_lock();
400 if ((in6_dev = __in6_dev_get(dev)) == NULL) {
401 rcu_read_unlock();
402 return;
403 }
404
405 read_lock_bh(&in6_dev->lock);
406 list_for_each_entry(ifp, &in6_dev->addr_list, if_list) {
407
408 addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
409 if (addr) {
410 addr->a.v6.sin6_family = AF_INET6;
411 addr->a.v6.sin6_port = 0;
412 addr->a.v6.sin6_addr = ifp->addr;
413 addr->a.v6.sin6_scope_id = dev->ifindex;
414 addr->valid = 1;
415 INIT_LIST_HEAD(&addr->list);
416 list_add_tail(&addr->list, addrlist);
417 }
418 }
419
420 read_unlock_bh(&in6_dev->lock);
421 rcu_read_unlock();
422}
423
424
425static void sctp_v6_from_skb(union sctp_addr *addr,struct sk_buff *skb,
426 int is_saddr)
427{
428 __be16 *port;
429 struct sctphdr *sh;
430
431 port = &addr->v6.sin6_port;
432 addr->v6.sin6_family = AF_INET6;
433 addr->v6.sin6_flowinfo = 0;
434 addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif;
435
436 sh = sctp_hdr(skb);
437 if (is_saddr) {
438 *port = sh->source;
439 addr->v6.sin6_addr = ipv6_hdr(skb)->saddr;
440 } else {
441 *port = sh->dest;
442 addr->v6.sin6_addr = ipv6_hdr(skb)->daddr;
443 }
444}
445
446
447static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk)
448{
449 addr->v6.sin6_family = AF_INET6;
450 addr->v6.sin6_port = 0;
451 addr->v6.sin6_addr = inet6_sk(sk)->rcv_saddr;
452}
453
454
455static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
456{
457 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
458 inet6_sk(sk)->rcv_saddr.s6_addr32[0] = 0;
459 inet6_sk(sk)->rcv_saddr.s6_addr32[1] = 0;
460 inet6_sk(sk)->rcv_saddr.s6_addr32[2] = htonl(0x0000ffff);
461 inet6_sk(sk)->rcv_saddr.s6_addr32[3] =
462 addr->v4.sin_addr.s_addr;
463 } else {
464 inet6_sk(sk)->rcv_saddr = addr->v6.sin6_addr;
465 }
466}
467
468
469static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
470{
471 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
472 inet6_sk(sk)->daddr.s6_addr32[0] = 0;
473 inet6_sk(sk)->daddr.s6_addr32[1] = 0;
474 inet6_sk(sk)->daddr.s6_addr32[2] = htonl(0x0000ffff);
475 inet6_sk(sk)->daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
476 } else {
477 inet6_sk(sk)->daddr = addr->v6.sin6_addr;
478 }
479}
480
481
482static void sctp_v6_from_addr_param(union sctp_addr *addr,
483 union sctp_addr_param *param,
484 __be16 port, int iif)
485{
486 addr->v6.sin6_family = AF_INET6;
487 addr->v6.sin6_port = port;
488 addr->v6.sin6_flowinfo = 0;
489 addr->v6.sin6_addr = param->v6.addr;
490 addr->v6.sin6_scope_id = iif;
491}
492
493
494
495
496static int sctp_v6_to_addr_param(const union sctp_addr *addr,
497 union sctp_addr_param *param)
498{
499 int length = sizeof(sctp_ipv6addr_param_t);
500
501 param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS;
502 param->v6.param_hdr.length = htons(length);
503 param->v6.addr = addr->v6.sin6_addr;
504
505 return length;
506}
507
508
509static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr,
510 __be16 port)
511{
512 addr->sa.sa_family = AF_INET6;
513 addr->v6.sin6_port = port;
514 addr->v6.sin6_addr = *saddr;
515}
516
517
518
519
520static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
521 const union sctp_addr *addr2)
522{
523 if (addr1->sa.sa_family != addr2->sa.sa_family) {
524 if (addr1->sa.sa_family == AF_INET &&
525 addr2->sa.sa_family == AF_INET6 &&
526 ipv6_addr_v4mapped(&addr2->v6.sin6_addr)) {
527 if (addr2->v6.sin6_port == addr1->v4.sin_port &&
528 addr2->v6.sin6_addr.s6_addr32[3] ==
529 addr1->v4.sin_addr.s_addr)
530 return 1;
531 }
532 if (addr2->sa.sa_family == AF_INET &&
533 addr1->sa.sa_family == AF_INET6 &&
534 ipv6_addr_v4mapped(&addr1->v6.sin6_addr)) {
535 if (addr1->v6.sin6_port == addr2->v4.sin_port &&
536 addr1->v6.sin6_addr.s6_addr32[3] ==
537 addr2->v4.sin_addr.s_addr)
538 return 1;
539 }
540 return 0;
541 }
542 if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr))
543 return 0;
544
545 if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) {
546 if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id &&
547 (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) {
548 return 0;
549 }
550 }
551
552 return 1;
553}
554
555
556static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port)
557{
558 memset(addr, 0x00, sizeof(union sctp_addr));
559 addr->v6.sin6_family = AF_INET6;
560 addr->v6.sin6_port = port;
561}
562
563
564static int sctp_v6_is_any(const union sctp_addr *addr)
565{
566 return ipv6_addr_any(&addr->v6.sin6_addr);
567}
568
569
570static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp)
571{
572 int type;
573 const struct in6_addr *in6 = (const struct in6_addr *)&addr->v6.sin6_addr;
574
575 type = ipv6_addr_type(in6);
576 if (IPV6_ADDR_ANY == type)
577 return 1;
578 if (type == IPV6_ADDR_MAPPED) {
579 if (sp && !sp->v4mapped)
580 return 0;
581 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
582 return 0;
583 sctp_v6_map_v4(addr);
584 return sctp_get_af_specific(AF_INET)->available(addr, sp);
585 }
586 if (!(type & IPV6_ADDR_UNICAST))
587 return 0;
588
589 return ipv6_chk_addr(sock_net(&sp->inet.sk), in6, NULL, 0);
590}
591
592
593
594
595
596
597
598
599static int sctp_v6_addr_valid(union sctp_addr *addr,
600 struct sctp_sock *sp,
601 const struct sk_buff *skb)
602{
603 int ret = ipv6_addr_type(&addr->v6.sin6_addr);
604
605
606 if (ret == IPV6_ADDR_MAPPED) {
607
608
609
610 if (!sp || !sp->v4mapped)
611 return 0;
612 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
613 return 0;
614 sctp_v6_map_v4(addr);
615 return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb);
616 }
617
618
619 if (!(ret & IPV6_ADDR_UNICAST))
620 return 0;
621
622 return 1;
623}
624
625
626static sctp_scope_t sctp_v6_scope(union sctp_addr *addr)
627{
628 int v6scope;
629 sctp_scope_t retval;
630
631
632
633
634
635 v6scope = ipv6_addr_scope(&addr->v6.sin6_addr);
636 switch (v6scope) {
637 case IFA_HOST:
638 retval = SCTP_SCOPE_LOOPBACK;
639 break;
640 case IFA_LINK:
641 retval = SCTP_SCOPE_LINK;
642 break;
643 case IFA_SITE:
644 retval = SCTP_SCOPE_PRIVATE;
645 break;
646 default:
647 retval = SCTP_SCOPE_GLOBAL;
648 break;
649 }
650
651 return retval;
652}
653
654
655static struct sock *sctp_v6_create_accept_sk(struct sock *sk,
656 struct sctp_association *asoc)
657{
658 struct sock *newsk;
659 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
660 struct sctp6_sock *newsctp6sk;
661
662 newsk = sk_alloc(sock_net(sk), PF_INET6, GFP_KERNEL, sk->sk_prot);
663 if (!newsk)
664 goto out;
665
666 sock_init_data(NULL, newsk);
667
668 sctp_copy_sock(newsk, sk, asoc);
669 sock_reset_flag(sk, SOCK_ZAPPED);
670
671 newsctp6sk = (struct sctp6_sock *)newsk;
672 inet_sk(newsk)->pinet6 = &newsctp6sk->inet6;
673
674 sctp_sk(newsk)->v4mapped = sctp_sk(sk)->v4mapped;
675
676 newnp = inet6_sk(newsk);
677
678 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
679
680
681
682
683 sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);
684
685 sk_refcnt_debug_inc(newsk);
686
687 if (newsk->sk_prot->init(newsk)) {
688 sk_common_release(newsk);
689 newsk = NULL;
690 }
691
692out:
693 return newsk;
694}
695
696
697static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
698{
699 if (sp->v4mapped && AF_INET == addr->sa.sa_family)
700 sctp_v4_map_v6(addr);
701}
702
703
704static int sctp_v6_skb_iif(const struct sk_buff *skb)
705{
706 struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
707 return opt->iif;
708}
709
710
711static int sctp_v6_is_ce(const struct sk_buff *skb)
712{
713 return *((__u32 *)(ipv6_hdr(skb))) & htonl(1 << 20);
714}
715
716
717static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
718{
719 seq_printf(seq, "%pI6 ", &addr->v6.sin6_addr);
720}
721
722static void sctp_v6_ecn_capable(struct sock *sk)
723{
724 inet6_sk(sk)->tclass |= INET_ECN_ECT_0;
725}
726
727
728static void sctp_inet6_msgname(char *msgname, int *addr_len)
729{
730 struct sockaddr_in6 *sin6;
731
732 sin6 = (struct sockaddr_in6 *)msgname;
733 sin6->sin6_family = AF_INET6;
734 sin6->sin6_flowinfo = 0;
735 sin6->sin6_scope_id = 0;
736 *addr_len = sizeof(struct sockaddr_in6);
737}
738
739
740static void sctp_inet6_event_msgname(struct sctp_ulpevent *event,
741 char *msgname, int *addrlen)
742{
743 struct sockaddr_in6 *sin6, *sin6from;
744
745 if (msgname) {
746 union sctp_addr *addr;
747 struct sctp_association *asoc;
748
749 asoc = event->asoc;
750 sctp_inet6_msgname(msgname, addrlen);
751 sin6 = (struct sockaddr_in6 *)msgname;
752 sin6->sin6_port = htons(asoc->peer.port);
753 addr = &asoc->peer.primary_addr;
754
755
756
757
758
759
760 if (sctp_sk(asoc->base.sk)->v4mapped &&
761 AF_INET == addr->sa.sa_family) {
762 sctp_v4_map_v6((union sctp_addr *)sin6);
763 sin6->sin6_addr.s6_addr32[3] =
764 addr->v4.sin_addr.s_addr;
765 return;
766 }
767
768 sin6from = &asoc->peer.primary_addr.v6;
769 sin6->sin6_addr = sin6from->sin6_addr;
770 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
771 sin6->sin6_scope_id = sin6from->sin6_scope_id;
772 }
773}
774
775
776static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname,
777 int *addr_len)
778{
779 struct sctphdr *sh;
780 struct sockaddr_in6 *sin6;
781
782 if (msgname) {
783 sctp_inet6_msgname(msgname, addr_len);
784 sin6 = (struct sockaddr_in6 *)msgname;
785 sh = sctp_hdr(skb);
786 sin6->sin6_port = sh->source;
787
788
789 if (sctp_sk(skb->sk)->v4mapped &&
790 ip_hdr(skb)->version == 4) {
791 sctp_v4_map_v6((union sctp_addr *)sin6);
792 sin6->sin6_addr.s6_addr32[3] = ip_hdr(skb)->saddr;
793 return;
794 }
795
796
797 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
798 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) {
799 struct sctp_ulpevent *ev = sctp_skb2event(skb);
800 sin6->sin6_scope_id = ev->iif;
801 }
802 }
803}
804
805
806static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp)
807{
808 switch (family) {
809 case AF_INET6:
810 return 1;
811
812 case AF_INET:
813 if (!__ipv6_only_sock(sctp_opt2sk(sp)))
814 return 1;
815 default:
816 return 0;
817 }
818}
819
820
821
822
823
824static int sctp_inet6_cmp_addr(const union sctp_addr *addr1,
825 const union sctp_addr *addr2,
826 struct sctp_sock *opt)
827{
828 struct sctp_af *af1, *af2;
829 struct sock *sk = sctp_opt2sk(opt);
830
831 af1 = sctp_get_af_specific(addr1->sa.sa_family);
832 af2 = sctp_get_af_specific(addr2->sa.sa_family);
833
834 if (!af1 || !af2)
835 return 0;
836
837
838 if (__ipv6_only_sock(sk) && af1 != af2)
839 return 0;
840
841
842 if (sctp_is_any(sk, addr1) || sctp_is_any(sk, addr2))
843 return 1;
844
845 if (addr1->sa.sa_family != addr2->sa.sa_family)
846 return 0;
847
848 return af1->cmp_addr(addr1, addr2);
849}
850
851
852
853
854static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
855{
856 struct sctp_af *af;
857
858
859 if (addr->sa.sa_family != AF_INET6)
860 af = sctp_get_af_specific(addr->sa.sa_family);
861 else {
862 int type = ipv6_addr_type(&addr->v6.sin6_addr);
863 struct net_device *dev;
864
865 if (type & IPV6_ADDR_LINKLOCAL) {
866 struct net *net;
867 if (!addr->v6.sin6_scope_id)
868 return 0;
869 net = sock_net(&opt->inet.sk);
870 rcu_read_lock();
871 dev = dev_get_by_index_rcu(net, addr->v6.sin6_scope_id);
872 if (!dev ||
873 !ipv6_chk_addr(net, &addr->v6.sin6_addr, dev, 0)) {
874 rcu_read_unlock();
875 return 0;
876 }
877 rcu_read_unlock();
878 } else if (type == IPV6_ADDR_MAPPED) {
879 if (!opt->v4mapped)
880 return 0;
881 }
882
883 af = opt->pf->af;
884 }
885 return af->available(addr, opt);
886}
887
888
889
890
891static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
892{
893 struct sctp_af *af = NULL;
894
895
896 if (addr->sa.sa_family != AF_INET6)
897 af = sctp_get_af_specific(addr->sa.sa_family);
898 else {
899 int type = ipv6_addr_type(&addr->v6.sin6_addr);
900 struct net_device *dev;
901
902 if (type & IPV6_ADDR_LINKLOCAL) {
903 if (!addr->v6.sin6_scope_id)
904 return 0;
905 rcu_read_lock();
906 dev = dev_get_by_index_rcu(sock_net(&opt->inet.sk),
907 addr->v6.sin6_scope_id);
908 rcu_read_unlock();
909 if (!dev)
910 return 0;
911 }
912 af = opt->pf->af;
913 }
914
915 return af != NULL;
916}
917
918
919
920
921
922
923
924static int sctp_inet6_supported_addrs(const struct sctp_sock *opt,
925 __be16 *types)
926{
927 types[0] = SCTP_PARAM_IPV6_ADDRESS;
928 if (!opt || !ipv6_only_sock(sctp_opt2sk(opt))) {
929 types[1] = SCTP_PARAM_IPV4_ADDRESS;
930 return 2;
931 }
932 return 1;
933}
934
935static const struct proto_ops inet6_seqpacket_ops = {
936 .family = PF_INET6,
937 .owner = THIS_MODULE,
938 .release = inet6_release,
939 .bind = inet6_bind,
940 .connect = inet_dgram_connect,
941 .socketpair = sock_no_socketpair,
942 .accept = inet_accept,
943 .getname = inet6_getname,
944 .poll = sctp_poll,
945 .ioctl = inet6_ioctl,
946 .listen = sctp_inet_listen,
947 .shutdown = inet_shutdown,
948 .setsockopt = sock_common_setsockopt,
949 .getsockopt = sock_common_getsockopt,
950 .sendmsg = inet_sendmsg,
951 .recvmsg = sock_common_recvmsg,
952 .mmap = sock_no_mmap,
953#ifdef CONFIG_COMPAT
954 .compat_setsockopt = compat_sock_common_setsockopt,
955 .compat_getsockopt = compat_sock_common_getsockopt,
956#endif
957};
958
959static struct inet_protosw sctpv6_seqpacket_protosw = {
960 .type = SOCK_SEQPACKET,
961 .protocol = IPPROTO_SCTP,
962 .prot = &sctpv6_prot,
963 .ops = &inet6_seqpacket_ops,
964 .no_check = 0,
965 .flags = SCTP_PROTOSW_FLAG
966};
967static struct inet_protosw sctpv6_stream_protosw = {
968 .type = SOCK_STREAM,
969 .protocol = IPPROTO_SCTP,
970 .prot = &sctpv6_prot,
971 .ops = &inet6_seqpacket_ops,
972 .no_check = 0,
973 .flags = SCTP_PROTOSW_FLAG,
974};
975
976static int sctp6_rcv(struct sk_buff *skb)
977{
978 return sctp_rcv(skb) ? -1 : 0;
979}
980
981static const struct inet6_protocol sctpv6_protocol = {
982 .handler = sctp6_rcv,
983 .err_handler = sctp_v6_err,
984 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
985};
986
987static struct sctp_af sctp_af_inet6 = {
988 .sa_family = AF_INET6,
989 .sctp_xmit = sctp_v6_xmit,
990 .setsockopt = ipv6_setsockopt,
991 .getsockopt = ipv6_getsockopt,
992 .get_dst = sctp_v6_get_dst,
993 .get_saddr = sctp_v6_get_saddr,
994 .copy_addrlist = sctp_v6_copy_addrlist,
995 .from_skb = sctp_v6_from_skb,
996 .from_sk = sctp_v6_from_sk,
997 .to_sk_saddr = sctp_v6_to_sk_saddr,
998 .to_sk_daddr = sctp_v6_to_sk_daddr,
999 .from_addr_param = sctp_v6_from_addr_param,
1000 .to_addr_param = sctp_v6_to_addr_param,
1001 .cmp_addr = sctp_v6_cmp_addr,
1002 .scope = sctp_v6_scope,
1003 .addr_valid = sctp_v6_addr_valid,
1004 .inaddr_any = sctp_v6_inaddr_any,
1005 .is_any = sctp_v6_is_any,
1006 .available = sctp_v6_available,
1007 .skb_iif = sctp_v6_skb_iif,
1008 .is_ce = sctp_v6_is_ce,
1009 .seq_dump_addr = sctp_v6_seq_dump_addr,
1010 .ecn_capable = sctp_v6_ecn_capable,
1011 .net_header_len = sizeof(struct ipv6hdr),
1012 .sockaddr_len = sizeof(struct sockaddr_in6),
1013#ifdef CONFIG_COMPAT
1014 .compat_setsockopt = compat_ipv6_setsockopt,
1015 .compat_getsockopt = compat_ipv6_getsockopt,
1016#endif
1017};
1018
1019static struct sctp_pf sctp_pf_inet6 = {
1020 .event_msgname = sctp_inet6_event_msgname,
1021 .skb_msgname = sctp_inet6_skb_msgname,
1022 .af_supported = sctp_inet6_af_supported,
1023 .cmp_addr = sctp_inet6_cmp_addr,
1024 .bind_verify = sctp_inet6_bind_verify,
1025 .send_verify = sctp_inet6_send_verify,
1026 .supported_addrs = sctp_inet6_supported_addrs,
1027 .create_accept_sk = sctp_v6_create_accept_sk,
1028 .addr_v4map = sctp_v6_addr_v4map,
1029 .af = &sctp_af_inet6,
1030};
1031
1032
1033void sctp_v6_pf_init(void)
1034{
1035
1036 sctp_register_pf(&sctp_pf_inet6, PF_INET6);
1037
1038
1039 sctp_register_af(&sctp_af_inet6);
1040}
1041
1042void sctp_v6_pf_exit(void)
1043{
1044 list_del(&sctp_af_inet6.list);
1045}
1046
1047
1048int sctp_v6_protosw_init(void)
1049{
1050 int rc;
1051
1052 rc = proto_register(&sctpv6_prot, 1);
1053 if (rc)
1054 return rc;
1055
1056
1057 inet6_register_protosw(&sctpv6_seqpacket_protosw);
1058 inet6_register_protosw(&sctpv6_stream_protosw);
1059
1060 return 0;
1061}
1062
1063void sctp_v6_protosw_exit(void)
1064{
1065 inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
1066 inet6_unregister_protosw(&sctpv6_stream_protosw);
1067 proto_unregister(&sctpv6_prot);
1068}
1069
1070
1071
1072int sctp_v6_add_protocol(void)
1073{
1074
1075 register_inet6addr_notifier(&sctp_inet6addr_notifier);
1076
1077 if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0)
1078 return -EAGAIN;
1079
1080 return 0;
1081}
1082
1083
1084void sctp_v6_del_protocol(void)
1085{
1086 inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP);
1087 unregister_inet6addr_notifier(&sctp_inet6addr_notifier);
1088}
1089