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50#include <linux/module.h>
51#include <linux/errno.h>
52#include <linux/types.h>
53#include <linux/socket.h>
54#include <linux/sockios.h>
55#include <linux/net.h>
56#include <linux/in.h>
57#include <linux/in6.h>
58#include <linux/netdevice.h>
59#include <linux/init.h>
60#include <linux/ipsec.h>
61
62#include <linux/ipv6.h>
63#include <linux/icmpv6.h>
64#include <linux/random.h>
65#include <linux/seq_file.h>
66
67#include <net/protocol.h>
68#include <net/ndisc.h>
69#include <net/ip.h>
70#include <net/ipv6.h>
71#include <net/transp_v6.h>
72#include <net/addrconf.h>
73#include <net/ip6_route.h>
74#include <net/inet_common.h>
75#include <net/inet_ecn.h>
76#include <net/sctp/sctp.h>
77
78#include <asm/uaccess.h>
79
80
81
82
83
84
85
86static int sctp_inet6addr_event(struct notifier_block *this, unsigned long ev,
87 void *ptr)
88{
89 struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
90 struct sctp_sockaddr_entry *addr = NULL;
91 struct sctp_sockaddr_entry *temp;
92
93 switch (ev) {
94 case NETDEV_UP:
95 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
96 if (addr) {
97 addr->a.v6.sin6_family = AF_INET6;
98 addr->a.v6.sin6_port = 0;
99 memcpy(&addr->a.v6.sin6_addr, &ifa->addr,
100 sizeof(struct in6_addr));
101 addr->a.v6.sin6_scope_id = ifa->idev->dev->ifindex;
102 addr->valid = 1;
103 spin_lock_bh(&sctp_local_addr_lock);
104 list_add_tail_rcu(&addr->list, &sctp_local_addr_list);
105 spin_unlock_bh(&sctp_local_addr_lock);
106 }
107 break;
108 case NETDEV_DOWN:
109 spin_lock_bh(&sctp_local_addr_lock);
110 list_for_each_entry_safe(addr, temp,
111 &sctp_local_addr_list, list) {
112 if (ipv6_addr_equal(&addr->a.v6.sin6_addr,
113 &ifa->addr)) {
114 addr->valid = 0;
115 list_del_rcu(&addr->list);
116 break;
117 }
118 }
119 spin_unlock_bh(&sctp_local_addr_lock);
120 if (addr && !addr->valid)
121 call_rcu(&addr->rcu, sctp_local_addr_free);
122 break;
123 }
124
125 return NOTIFY_DONE;
126}
127
128static struct notifier_block sctp_inet6addr_notifier = {
129 .notifier_call = sctp_inet6addr_event,
130};
131
132
133SCTP_STATIC void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
134 int type, int code, int offset, __be32 info)
135{
136 struct inet6_dev *idev;
137 struct sock *sk;
138 struct sctp_association *asoc;
139 struct sctp_transport *transport;
140 struct ipv6_pinfo *np;
141 sk_buff_data_t saveip, savesctp;
142 int err;
143
144 idev = in6_dev_get(skb->dev);
145
146
147 saveip = skb->network_header;
148 savesctp = skb->transport_header;
149 skb_reset_network_header(skb);
150 skb_set_transport_header(skb, offset);
151 sk = sctp_err_lookup(AF_INET6, skb, sctp_hdr(skb), &asoc, &transport);
152
153 skb->network_header = saveip;
154 skb->transport_header = savesctp;
155 if (!sk) {
156 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INERRORS);
157 goto out;
158 }
159
160
161
162
163
164 switch (type) {
165 case ICMPV6_PKT_TOOBIG:
166 sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info));
167 goto out_unlock;
168 case ICMPV6_PARAMPROB:
169 if (ICMPV6_UNK_NEXTHDR == code) {
170 sctp_icmp_proto_unreachable(sk, asoc, transport);
171 goto out_unlock;
172 }
173 break;
174 default:
175 break;
176 }
177
178 np = inet6_sk(sk);
179 icmpv6_err_convert(type, code, &err);
180 if (!sock_owned_by_user(sk) && np->recverr) {
181 sk->sk_err = err;
182 sk->sk_error_report(sk);
183 } else {
184 sk->sk_err_soft = err;
185 }
186
187out_unlock:
188 sctp_err_finish(sk, asoc);
189out:
190 if (likely(idev != NULL))
191 in6_dev_put(idev);
192}
193
194
195static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport,
196 int ipfragok)
197{
198 struct sock *sk = skb->sk;
199 struct ipv6_pinfo *np = inet6_sk(sk);
200 struct flowi fl;
201
202 memset(&fl, 0, sizeof(fl));
203
204 fl.proto = sk->sk_protocol;
205
206
207
208
209 ipv6_addr_copy(&fl.fl6_dst, &transport->ipaddr.v6.sin6_addr);
210 ipv6_addr_copy(&fl.fl6_src, &transport->saddr.v6.sin6_addr);
211
212 fl.fl6_flowlabel = np->flow_label;
213 IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel);
214 if (ipv6_addr_type(&fl.fl6_src) & IPV6_ADDR_LINKLOCAL)
215 fl.oif = transport->saddr.v6.sin6_scope_id;
216 else
217 fl.oif = sk->sk_bound_dev_if;
218
219 if (np->opt && np->opt->srcrt) {
220 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
221 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
222 }
223
224 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, "
225 "src:" NIP6_FMT " dst:" NIP6_FMT "\n",
226 __FUNCTION__, skb, skb->len,
227 NIP6(fl.fl6_src), NIP6(fl.fl6_dst));
228
229 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
230
231 return ip6_xmit(sk, skb, &fl, np->opt, ipfragok);
232}
233
234
235
236
237static struct dst_entry *sctp_v6_get_dst(struct sctp_association *asoc,
238 union sctp_addr *daddr,
239 union sctp_addr *saddr)
240{
241 struct dst_entry *dst;
242 struct flowi fl;
243
244 memset(&fl, 0, sizeof(fl));
245 ipv6_addr_copy(&fl.fl6_dst, &daddr->v6.sin6_addr);
246 if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
247 fl.oif = daddr->v6.sin6_scope_id;
248
249
250 SCTP_DEBUG_PRINTK("%s: DST=" NIP6_FMT " ",
251 __FUNCTION__, NIP6(fl.fl6_dst));
252
253 if (saddr) {
254 ipv6_addr_copy(&fl.fl6_src, &saddr->v6.sin6_addr);
255 SCTP_DEBUG_PRINTK(
256 "SRC=" NIP6_FMT " - ",
257 NIP6(fl.fl6_src));
258 }
259
260 dst = ip6_route_output(NULL, &fl);
261 if (!dst->error) {
262 struct rt6_info *rt;
263 rt = (struct rt6_info *)dst;
264 SCTP_DEBUG_PRINTK(
265 "rt6_dst:" NIP6_FMT " rt6_src:" NIP6_FMT "\n",
266 NIP6(rt->rt6i_dst.addr), NIP6(rt->rt6i_src.addr));
267 return dst;
268 }
269 SCTP_DEBUG_PRINTK("NO ROUTE\n");
270 dst_release(dst);
271 return NULL;
272}
273
274
275
276
277static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
278 union sctp_addr *s2)
279{
280 struct in6_addr *a1 = &s1->v6.sin6_addr;
281 struct in6_addr *a2 = &s2->v6.sin6_addr;
282 int i, j;
283
284 for (i = 0; i < 4 ; i++) {
285 __be32 a1xora2;
286
287 a1xora2 = a1->s6_addr32[i] ^ a2->s6_addr32[i];
288
289 if ((j = fls(ntohl(a1xora2))))
290 return (i * 32 + 32 - j);
291 }
292
293 return (i*32);
294}
295
296
297
298
299static void sctp_v6_get_saddr(struct sctp_association *asoc,
300 struct dst_entry *dst,
301 union sctp_addr *daddr,
302 union sctp_addr *saddr)
303{
304 struct sctp_bind_addr *bp;
305 struct sctp_sockaddr_entry *laddr;
306 sctp_scope_t scope;
307 union sctp_addr *baddr = NULL;
308 __u8 matchlen = 0;
309 __u8 bmatchlen;
310
311 SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p "
312 "daddr:" NIP6_FMT " ",
313 __FUNCTION__, asoc, dst, NIP6(daddr->v6.sin6_addr));
314
315 if (!asoc) {
316 ipv6_get_saddr(dst, &daddr->v6.sin6_addr,&saddr->v6.sin6_addr);
317 SCTP_DEBUG_PRINTK("saddr from ipv6_get_saddr: " NIP6_FMT "\n",
318 NIP6(saddr->v6.sin6_addr));
319 return;
320 }
321
322 scope = sctp_scope(daddr);
323
324 bp = &asoc->base.bind_addr;
325
326
327
328
329 rcu_read_lock();
330 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
331 if (!laddr->valid)
332 continue;
333 if ((laddr->use_as_src) &&
334 (laddr->a.sa.sa_family == AF_INET6) &&
335 (scope <= sctp_scope(&laddr->a))) {
336 bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a);
337 if (!baddr || (matchlen < bmatchlen)) {
338 baddr = &laddr->a;
339 matchlen = bmatchlen;
340 }
341 }
342 }
343
344 if (baddr) {
345 memcpy(saddr, baddr, sizeof(union sctp_addr));
346 SCTP_DEBUG_PRINTK("saddr: " NIP6_FMT "\n",
347 NIP6(saddr->v6.sin6_addr));
348 } else {
349 printk(KERN_ERR "%s: asoc:%p Could not find a valid source "
350 "address for the dest:" NIP6_FMT "\n",
351 __FUNCTION__, asoc, NIP6(daddr->v6.sin6_addr));
352 }
353
354 rcu_read_unlock();
355}
356
357
358static void sctp_v6_copy_addrlist(struct list_head *addrlist,
359 struct net_device *dev)
360{
361 struct inet6_dev *in6_dev;
362 struct inet6_ifaddr *ifp;
363 struct sctp_sockaddr_entry *addr;
364
365 rcu_read_lock();
366 if ((in6_dev = __in6_dev_get(dev)) == NULL) {
367 rcu_read_unlock();
368 return;
369 }
370
371 read_lock_bh(&in6_dev->lock);
372 for (ifp = in6_dev->addr_list; ifp; ifp = ifp->if_next) {
373
374 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
375 if (addr) {
376 addr->a.v6.sin6_family = AF_INET6;
377 addr->a.v6.sin6_port = 0;
378 addr->a.v6.sin6_addr = ifp->addr;
379 addr->a.v6.sin6_scope_id = dev->ifindex;
380 addr->valid = 1;
381 INIT_LIST_HEAD(&addr->list);
382 INIT_RCU_HEAD(&addr->rcu);
383 list_add_tail(&addr->list, addrlist);
384 }
385 }
386
387 read_unlock_bh(&in6_dev->lock);
388 rcu_read_unlock();
389}
390
391
392static void sctp_v6_from_skb(union sctp_addr *addr,struct sk_buff *skb,
393 int is_saddr)
394{
395 void *from;
396 __be16 *port;
397 struct sctphdr *sh;
398
399 port = &addr->v6.sin6_port;
400 addr->v6.sin6_family = AF_INET6;
401 addr->v6.sin6_flowinfo = 0;
402 addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif;
403
404 sh = sctp_hdr(skb);
405 if (is_saddr) {
406 *port = sh->source;
407 from = &ipv6_hdr(skb)->saddr;
408 } else {
409 *port = sh->dest;
410 from = &ipv6_hdr(skb)->daddr;
411 }
412 ipv6_addr_copy(&addr->v6.sin6_addr, from);
413}
414
415
416static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk)
417{
418 addr->v6.sin6_family = AF_INET6;
419 addr->v6.sin6_port = 0;
420 addr->v6.sin6_addr = inet6_sk(sk)->rcv_saddr;
421}
422
423
424static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
425{
426 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
427 inet6_sk(sk)->rcv_saddr.s6_addr32[0] = 0;
428 inet6_sk(sk)->rcv_saddr.s6_addr32[1] = 0;
429 inet6_sk(sk)->rcv_saddr.s6_addr32[2] = htonl(0x0000ffff);
430 inet6_sk(sk)->rcv_saddr.s6_addr32[3] =
431 addr->v4.sin_addr.s_addr;
432 } else {
433 inet6_sk(sk)->rcv_saddr = addr->v6.sin6_addr;
434 }
435}
436
437
438static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
439{
440 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
441 inet6_sk(sk)->daddr.s6_addr32[0] = 0;
442 inet6_sk(sk)->daddr.s6_addr32[1] = 0;
443 inet6_sk(sk)->daddr.s6_addr32[2] = htonl(0x0000ffff);
444 inet6_sk(sk)->daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
445 } else {
446 inet6_sk(sk)->daddr = addr->v6.sin6_addr;
447 }
448}
449
450
451static void sctp_v6_from_addr_param(union sctp_addr *addr,
452 union sctp_addr_param *param,
453 __be16 port, int iif)
454{
455 addr->v6.sin6_family = AF_INET6;
456 addr->v6.sin6_port = port;
457 addr->v6.sin6_flowinfo = 0;
458 ipv6_addr_copy(&addr->v6.sin6_addr, ¶m->v6.addr);
459 addr->v6.sin6_scope_id = iif;
460}
461
462
463
464
465static int sctp_v6_to_addr_param(const union sctp_addr *addr,
466 union sctp_addr_param *param)
467{
468 int length = sizeof(sctp_ipv6addr_param_t);
469
470 param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS;
471 param->v6.param_hdr.length = htons(length);
472 ipv6_addr_copy(¶m->v6.addr, &addr->v6.sin6_addr);
473
474 return length;
475}
476
477
478static void sctp_v6_dst_saddr(union sctp_addr *addr, struct dst_entry *dst,
479 __be16 port)
480{
481 struct rt6_info *rt = (struct rt6_info *)dst;
482 addr->sa.sa_family = AF_INET6;
483 addr->v6.sin6_port = port;
484 ipv6_addr_copy(&addr->v6.sin6_addr, &rt->rt6i_src.addr);
485}
486
487
488
489
490static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
491 const union sctp_addr *addr2)
492{
493 if (addr1->sa.sa_family != addr2->sa.sa_family) {
494 if (addr1->sa.sa_family == AF_INET &&
495 addr2->sa.sa_family == AF_INET6 &&
496 ipv6_addr_v4mapped(&addr2->v6.sin6_addr)) {
497 if (addr2->v6.sin6_port == addr1->v4.sin_port &&
498 addr2->v6.sin6_addr.s6_addr32[3] ==
499 addr1->v4.sin_addr.s_addr)
500 return 1;
501 }
502 if (addr2->sa.sa_family == AF_INET &&
503 addr1->sa.sa_family == AF_INET6 &&
504 ipv6_addr_v4mapped(&addr1->v6.sin6_addr)) {
505 if (addr1->v6.sin6_port == addr2->v4.sin_port &&
506 addr1->v6.sin6_addr.s6_addr32[3] ==
507 addr2->v4.sin_addr.s_addr)
508 return 1;
509 }
510 return 0;
511 }
512 if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr))
513 return 0;
514
515 if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) {
516 if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id &&
517 (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) {
518 return 0;
519 }
520 }
521
522 return 1;
523}
524
525
526static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port)
527{
528 memset(addr, 0x00, sizeof(union sctp_addr));
529 addr->v6.sin6_family = AF_INET6;
530 addr->v6.sin6_port = port;
531}
532
533
534static int sctp_v6_is_any(const union sctp_addr *addr)
535{
536 return ipv6_addr_any(&addr->v6.sin6_addr);
537}
538
539
540static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp)
541{
542 int type;
543 struct in6_addr *in6 = (struct in6_addr *)&addr->v6.sin6_addr;
544
545 type = ipv6_addr_type(in6);
546 if (IPV6_ADDR_ANY == type)
547 return 1;
548 if (type == IPV6_ADDR_MAPPED) {
549 if (sp && !sp->v4mapped)
550 return 0;
551 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
552 return 0;
553 sctp_v6_map_v4(addr);
554 return sctp_get_af_specific(AF_INET)->available(addr, sp);
555 }
556 if (!(type & IPV6_ADDR_UNICAST))
557 return 0;
558
559 return ipv6_chk_addr(in6, NULL, 0);
560}
561
562
563
564
565
566
567
568
569static int sctp_v6_addr_valid(union sctp_addr *addr,
570 struct sctp_sock *sp,
571 const struct sk_buff *skb)
572{
573 int ret = ipv6_addr_type(&addr->v6.sin6_addr);
574
575
576 if (ret == IPV6_ADDR_MAPPED) {
577
578
579
580 if (!sp || !sp->v4mapped)
581 return 0;
582 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
583 return 0;
584 sctp_v6_map_v4(addr);
585 return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb);
586 }
587
588
589 if (!(ret & IPV6_ADDR_UNICAST))
590 return 0;
591
592 return 1;
593}
594
595
596static sctp_scope_t sctp_v6_scope(union sctp_addr *addr)
597{
598 int v6scope;
599 sctp_scope_t retval;
600
601
602
603
604
605 v6scope = ipv6_addr_scope(&addr->v6.sin6_addr);
606 switch (v6scope) {
607 case IFA_HOST:
608 retval = SCTP_SCOPE_LOOPBACK;
609 break;
610 case IFA_LINK:
611 retval = SCTP_SCOPE_LINK;
612 break;
613 case IFA_SITE:
614 retval = SCTP_SCOPE_PRIVATE;
615 break;
616 default:
617 retval = SCTP_SCOPE_GLOBAL;
618 break;
619 }
620
621 return retval;
622}
623
624
625static struct sock *sctp_v6_create_accept_sk(struct sock *sk,
626 struct sctp_association *asoc)
627{
628 struct inet_sock *inet = inet_sk(sk);
629 struct sock *newsk;
630 struct inet_sock *newinet;
631 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
632 struct sctp6_sock *newsctp6sk;
633
634 newsk = sk_alloc(sk->sk_net, PF_INET6, GFP_KERNEL, sk->sk_prot);
635 if (!newsk)
636 goto out;
637
638 sock_init_data(NULL, newsk);
639
640 newsk->sk_type = SOCK_STREAM;
641
642 newsk->sk_prot = sk->sk_prot;
643 newsk->sk_no_check = sk->sk_no_check;
644 newsk->sk_reuse = sk->sk_reuse;
645
646 newsk->sk_destruct = inet_sock_destruct;
647 newsk->sk_family = PF_INET6;
648 newsk->sk_protocol = IPPROTO_SCTP;
649 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
650 newsk->sk_shutdown = sk->sk_shutdown;
651 sock_reset_flag(sk, SOCK_ZAPPED);
652
653 newsctp6sk = (struct sctp6_sock *)newsk;
654 inet_sk(newsk)->pinet6 = &newsctp6sk->inet6;
655
656 sctp_sk(newsk)->v4mapped = sctp_sk(sk)->v4mapped;
657
658 newinet = inet_sk(newsk);
659 newnp = inet6_sk(newsk);
660
661 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
662
663
664
665
666 newinet->sport = inet->sport;
667 newnp->saddr = np->saddr;
668 newnp->rcv_saddr = np->rcv_saddr;
669 newinet->dport = htons(asoc->peer.port);
670 sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);
671
672
673
674
675 newinet->uc_ttl = -1;
676 newinet->mc_loop = 1;
677 newinet->mc_ttl = 1;
678 newinet->mc_index = 0;
679 newinet->mc_list = NULL;
680
681 if (ipv4_config.no_pmtu_disc)
682 newinet->pmtudisc = IP_PMTUDISC_DONT;
683 else
684 newinet->pmtudisc = IP_PMTUDISC_WANT;
685
686 sk_refcnt_debug_inc(newsk);
687
688 if (newsk->sk_prot->init(newsk)) {
689 sk_common_release(newsk);
690 newsk = NULL;
691 }
692
693out:
694 return newsk;
695}
696
697
698static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
699{
700 if (sp->v4mapped && AF_INET == addr->sa.sa_family)
701 sctp_v4_map_v6(addr);
702}
703
704
705static int sctp_v6_skb_iif(const struct sk_buff *skb)
706{
707 struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
708 return opt->iif;
709}
710
711
712static int sctp_v6_is_ce(const struct sk_buff *skb)
713{
714 return *((__u32 *)(ipv6_hdr(skb))) & htonl(1 << 20);
715}
716
717
718static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
719{
720 seq_printf(seq, NIP6_FMT " ", NIP6(addr->v6.sin6_addr));
721}
722
723
724static void sctp_inet6_msgname(char *msgname, int *addr_len)
725{
726 struct sockaddr_in6 *sin6;
727
728 sin6 = (struct sockaddr_in6 *)msgname;
729 sin6->sin6_family = AF_INET6;
730 sin6->sin6_flowinfo = 0;
731 sin6->sin6_scope_id = 0;
732 *addr_len = sizeof(struct sockaddr_in6);
733}
734
735
736static void sctp_inet6_event_msgname(struct sctp_ulpevent *event,
737 char *msgname, int *addrlen)
738{
739 struct sockaddr_in6 *sin6, *sin6from;
740
741 if (msgname) {
742 union sctp_addr *addr;
743 struct sctp_association *asoc;
744
745 asoc = event->asoc;
746 sctp_inet6_msgname(msgname, addrlen);
747 sin6 = (struct sockaddr_in6 *)msgname;
748 sin6->sin6_port = htons(asoc->peer.port);
749 addr = &asoc->peer.primary_addr;
750
751
752
753
754
755
756 if (sctp_sk(asoc->base.sk)->v4mapped &&
757 AF_INET == addr->sa.sa_family) {
758 sctp_v4_map_v6((union sctp_addr *)sin6);
759 sin6->sin6_addr.s6_addr32[3] =
760 addr->v4.sin_addr.s_addr;
761 return;
762 }
763
764 sin6from = &asoc->peer.primary_addr.v6;
765 ipv6_addr_copy(&sin6->sin6_addr, &sin6from->sin6_addr);
766 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
767 sin6->sin6_scope_id = sin6from->sin6_scope_id;
768 }
769}
770
771
772static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname,
773 int *addr_len)
774{
775 struct sctphdr *sh;
776 struct sockaddr_in6 *sin6;
777
778 if (msgname) {
779 sctp_inet6_msgname(msgname, addr_len);
780 sin6 = (struct sockaddr_in6 *)msgname;
781 sh = sctp_hdr(skb);
782 sin6->sin6_port = sh->source;
783
784
785 if (sctp_sk(skb->sk)->v4mapped &&
786 ip_hdr(skb)->version == 4) {
787 sctp_v4_map_v6((union sctp_addr *)sin6);
788 sin6->sin6_addr.s6_addr32[3] = ip_hdr(skb)->saddr;
789 return;
790 }
791
792
793 ipv6_addr_copy(&sin6->sin6_addr, &ipv6_hdr(skb)->saddr);
794 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) {
795 struct sctp_ulpevent *ev = sctp_skb2event(skb);
796 sin6->sin6_scope_id = ev->iif;
797 }
798 }
799}
800
801
802static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp)
803{
804 switch (family) {
805 case AF_INET6:
806 return 1;
807
808 case AF_INET:
809 if (!__ipv6_only_sock(sctp_opt2sk(sp)) && sp->v4mapped)
810 return 1;
811 default:
812 return 0;
813 }
814}
815
816
817
818
819
820static int sctp_inet6_cmp_addr(const union sctp_addr *addr1,
821 const union sctp_addr *addr2,
822 struct sctp_sock *opt)
823{
824 struct sctp_af *af1, *af2;
825
826 af1 = sctp_get_af_specific(addr1->sa.sa_family);
827 af2 = sctp_get_af_specific(addr2->sa.sa_family);
828
829 if (!af1 || !af2)
830 return 0;
831
832 if (sctp_is_any(addr1) || sctp_is_any(addr2))
833 return 1;
834
835 if (addr1->sa.sa_family != addr2->sa.sa_family)
836 return 0;
837
838 return af1->cmp_addr(addr1, addr2);
839}
840
841
842
843
844static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
845{
846 struct sctp_af *af;
847
848
849 if (addr->sa.sa_family != AF_INET6)
850 af = sctp_get_af_specific(addr->sa.sa_family);
851 else {
852 int type = ipv6_addr_type(&addr->v6.sin6_addr);
853 struct net_device *dev;
854
855 if (type & IPV6_ADDR_LINKLOCAL) {
856 if (!addr->v6.sin6_scope_id)
857 return 0;
858 dev = dev_get_by_index(&init_net, addr->v6.sin6_scope_id);
859 if (!dev)
860 return 0;
861 if (!ipv6_chk_addr(&addr->v6.sin6_addr, dev, 0)) {
862 dev_put(dev);
863 return 0;
864 }
865 dev_put(dev);
866 }
867 af = opt->pf->af;
868 }
869 return af->available(addr, opt);
870}
871
872
873
874
875static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
876{
877 struct sctp_af *af = NULL;
878
879
880 if (addr->sa.sa_family != AF_INET6)
881 af = sctp_get_af_specific(addr->sa.sa_family);
882 else {
883 int type = ipv6_addr_type(&addr->v6.sin6_addr);
884 struct net_device *dev;
885
886 if (type & IPV6_ADDR_LINKLOCAL) {
887 if (!addr->v6.sin6_scope_id)
888 return 0;
889 dev = dev_get_by_index(&init_net, addr->v6.sin6_scope_id);
890 if (!dev)
891 return 0;
892 dev_put(dev);
893 }
894 af = opt->pf->af;
895 }
896
897 return af != NULL;
898}
899
900
901
902
903
904
905
906static int sctp_inet6_supported_addrs(const struct sctp_sock *opt,
907 __be16 *types)
908{
909 types[0] = SCTP_PARAM_IPV4_ADDRESS;
910 types[1] = SCTP_PARAM_IPV6_ADDRESS;
911 return 2;
912}
913
914static const struct proto_ops inet6_seqpacket_ops = {
915 .family = PF_INET6,
916 .owner = THIS_MODULE,
917 .release = inet6_release,
918 .bind = inet6_bind,
919 .connect = inet_dgram_connect,
920 .socketpair = sock_no_socketpair,
921 .accept = inet_accept,
922 .getname = inet6_getname,
923 .poll = sctp_poll,
924 .ioctl = inet6_ioctl,
925 .listen = sctp_inet_listen,
926 .shutdown = inet_shutdown,
927 .setsockopt = sock_common_setsockopt,
928 .getsockopt = sock_common_getsockopt,
929 .sendmsg = inet_sendmsg,
930 .recvmsg = sock_common_recvmsg,
931 .mmap = sock_no_mmap,
932#ifdef CONFIG_COMPAT
933 .compat_setsockopt = compat_sock_common_setsockopt,
934 .compat_getsockopt = compat_sock_common_getsockopt,
935#endif
936};
937
938static struct inet_protosw sctpv6_seqpacket_protosw = {
939 .type = SOCK_SEQPACKET,
940 .protocol = IPPROTO_SCTP,
941 .prot = &sctpv6_prot,
942 .ops = &inet6_seqpacket_ops,
943 .capability = -1,
944 .no_check = 0,
945 .flags = SCTP_PROTOSW_FLAG
946};
947static struct inet_protosw sctpv6_stream_protosw = {
948 .type = SOCK_STREAM,
949 .protocol = IPPROTO_SCTP,
950 .prot = &sctpv6_prot,
951 .ops = &inet6_seqpacket_ops,
952 .capability = -1,
953 .no_check = 0,
954 .flags = SCTP_PROTOSW_FLAG,
955};
956
957static int sctp6_rcv(struct sk_buff *skb)
958{
959 return sctp_rcv(skb) ? -1 : 0;
960}
961
962static struct inet6_protocol sctpv6_protocol = {
963 .handler = sctp6_rcv,
964 .err_handler = sctp_v6_err,
965 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
966};
967
968static struct sctp_af sctp_ipv6_specific = {
969 .sa_family = AF_INET6,
970 .sctp_xmit = sctp_v6_xmit,
971 .setsockopt = ipv6_setsockopt,
972 .getsockopt = ipv6_getsockopt,
973 .get_dst = sctp_v6_get_dst,
974 .get_saddr = sctp_v6_get_saddr,
975 .copy_addrlist = sctp_v6_copy_addrlist,
976 .from_skb = sctp_v6_from_skb,
977 .from_sk = sctp_v6_from_sk,
978 .to_sk_saddr = sctp_v6_to_sk_saddr,
979 .to_sk_daddr = sctp_v6_to_sk_daddr,
980 .from_addr_param = sctp_v6_from_addr_param,
981 .to_addr_param = sctp_v6_to_addr_param,
982 .dst_saddr = sctp_v6_dst_saddr,
983 .cmp_addr = sctp_v6_cmp_addr,
984 .scope = sctp_v6_scope,
985 .addr_valid = sctp_v6_addr_valid,
986 .inaddr_any = sctp_v6_inaddr_any,
987 .is_any = sctp_v6_is_any,
988 .available = sctp_v6_available,
989 .skb_iif = sctp_v6_skb_iif,
990 .is_ce = sctp_v6_is_ce,
991 .seq_dump_addr = sctp_v6_seq_dump_addr,
992 .net_header_len = sizeof(struct ipv6hdr),
993 .sockaddr_len = sizeof(struct sockaddr_in6),
994#ifdef CONFIG_COMPAT
995 .compat_setsockopt = compat_ipv6_setsockopt,
996 .compat_getsockopt = compat_ipv6_getsockopt,
997#endif
998};
999
1000static struct sctp_pf sctp_pf_inet6_specific = {
1001 .event_msgname = sctp_inet6_event_msgname,
1002 .skb_msgname = sctp_inet6_skb_msgname,
1003 .af_supported = sctp_inet6_af_supported,
1004 .cmp_addr = sctp_inet6_cmp_addr,
1005 .bind_verify = sctp_inet6_bind_verify,
1006 .send_verify = sctp_inet6_send_verify,
1007 .supported_addrs = sctp_inet6_supported_addrs,
1008 .create_accept_sk = sctp_v6_create_accept_sk,
1009 .addr_v4map = sctp_v6_addr_v4map,
1010 .af = &sctp_ipv6_specific,
1011};
1012
1013
1014int sctp_v6_init(void)
1015{
1016 int rc;
1017
1018
1019 sctp_register_pf(&sctp_pf_inet6_specific, PF_INET6);
1020
1021
1022 sctp_register_af(&sctp_ipv6_specific);
1023
1024 rc = proto_register(&sctpv6_prot, 1);
1025 if (rc)
1026 return rc;
1027
1028
1029 inet6_register_protosw(&sctpv6_seqpacket_protosw);
1030 inet6_register_protosw(&sctpv6_stream_protosw);
1031
1032 return 0;
1033}
1034
1035
1036int sctp_v6_add_protocol(void)
1037{
1038
1039 register_inet6addr_notifier(&sctp_inet6addr_notifier);
1040
1041 if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0)
1042 return -EAGAIN;
1043
1044 return 0;
1045}
1046
1047
1048void sctp_v6_exit(void)
1049{
1050 inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
1051 inet6_unregister_protosw(&sctpv6_stream_protosw);
1052 proto_unregister(&sctpv6_prot);
1053 list_del(&sctp_ipv6_specific.list);
1054}
1055
1056
1057void sctp_v6_del_protocol(void)
1058{
1059 inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP);
1060 unregister_inet6addr_notifier(&sctp_inet6addr_notifier);
1061}
1062