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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 <asm/uaccess.h>
75
76 static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
77                                          union sctp_addr *s2);
78 static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr,
79                               __be16 port);
80 static 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  */
89 static 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
136 static struct notifier_block sctp_inet6addr_notifier = {
137         .notifier_call = sctp_inet6addr_event,
138 };
139
140 /* ICMP error handler. */
141 static 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
200 out_unlock:
201         sctp_err_finish(sk, asoc);
202 out:
203         if (likely(idev != NULL))
204                 in6_dev_put(idev);
205 }
206
207 static 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
213         pr_debug("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n", __func__, skb,
214                  skb->len, &fl6->saddr, &fl6->daddr);
215
216         IP6_ECN_flow_xmit(sk, fl6->flowlabel);
217
218         if (!(transport->param_flags & SPP_PMTUD_ENABLE))
219                 skb->ignore_df = 1;
220
221         SCTP_INC_STATS(sock_net(sk), SCTP_MIB_OUTSCTPPACKS);
222
223         return ip6_xmit(sk, skb, fl6, np->opt, np->tclass);
224 }
225
226 /* Returns the dst cache entry for the given source and destination ip
227  * addresses.
228  */
229 static void sctp_v6_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
230                             struct flowi *fl, struct sock *sk)
231 {
232         struct sctp_association *asoc = t->asoc;
233         struct dst_entry *dst = NULL;
234         struct flowi6 *fl6 = &fl->u.ip6;
235         struct sctp_bind_addr *bp;
236         struct ipv6_pinfo *np = inet6_sk(sk);
237         struct sctp_sockaddr_entry *laddr;
238         union sctp_addr *baddr = NULL;
239         union sctp_addr *daddr = &t->ipaddr;
240         union sctp_addr dst_saddr;
241         struct in6_addr *final_p, final;
242         __u8 matchlen = 0;
243         __u8 bmatchlen;
244         sctp_scope_t scope;
245
246         memset(fl6, 0, sizeof(struct flowi6));
247         fl6->daddr = daddr->v6.sin6_addr;
248         fl6->fl6_dport = daddr->v6.sin6_port;
249         fl6->flowi6_proto = IPPROTO_SCTP;
250         if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
251                 fl6->flowi6_oif = daddr->v6.sin6_scope_id;
252
253         pr_debug("%s: dst=%pI6 ", __func__, &fl6->daddr);
254
255         if (asoc)
256                 fl6->fl6_sport = htons(asoc->base.bind_addr.port);
257
258         if (saddr) {
259                 fl6->saddr = saddr->v6.sin6_addr;
260                 fl6->fl6_sport = saddr->v6.sin6_port;
261
262                 pr_debug("src=%pI6 - ", &fl6->saddr);
263         }
264
265         final_p = fl6_update_dst(fl6, np->opt, &final);
266         dst = ip6_dst_lookup_flow(sk, fl6, final_p);
267         if (!asoc || saddr)
268                 goto out;
269
270         bp = &asoc->base.bind_addr;
271         scope = sctp_scope(daddr);
272         /* ip6_dst_lookup has filled in the fl6->saddr for us.  Check
273          * to see if we can use it.
274          */
275         if (!IS_ERR(dst)) {
276                 /* Walk through the bind address list and look for a bind
277                  * address that matches the source address of the returned dst.
278                  */
279                 sctp_v6_to_addr(&dst_saddr, &fl6->saddr, htons(bp->port));
280                 rcu_read_lock();
281                 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
282                         if (!laddr->valid || laddr->state == SCTP_ADDR_DEL ||
283                             (laddr->state != SCTP_ADDR_SRC &&
284                              !asoc->src_out_of_asoc_ok))
285                                 continue;
286
287                         /* Do not compare against v4 addrs */
288                         if ((laddr->a.sa.sa_family == AF_INET6) &&
289                             (sctp_v6_cmp_addr(&dst_saddr, &laddr->a))) {
290                                 rcu_read_unlock();
291                                 goto out;
292                         }
293                 }
294                 rcu_read_unlock();
295                 /* None of the bound addresses match the source address of the
296                  * dst. So release it.
297                  */
298                 dst_release(dst);
299                 dst = NULL;
300         }
301
302         /* Walk through the bind address list and try to get the
303          * best source address for a given destination.
304          */
305         rcu_read_lock();
306         list_for_each_entry_rcu(laddr, &bp->address_list, list) {
307                 if (!laddr->valid)
308                         continue;
309                 if ((laddr->state == SCTP_ADDR_SRC) &&
310                     (laddr->a.sa.sa_family == AF_INET6) &&
311                     (scope <= sctp_scope(&laddr->a))) {
312                         bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a);
313                         if (!baddr || (matchlen < bmatchlen)) {
314                                 baddr = &laddr->a;
315                                 matchlen = bmatchlen;
316                         }
317                 }
318         }
319         rcu_read_unlock();
320
321         if (baddr) {
322                 fl6->saddr = baddr->v6.sin6_addr;
323                 fl6->fl6_sport = baddr->v6.sin6_port;
324                 final_p = fl6_update_dst(fl6, np->opt, &final);
325                 dst = ip6_dst_lookup_flow(sk, fl6, final_p);
326         }
327
328 out:
329         if (!IS_ERR_OR_NULL(dst)) {
330                 struct rt6_info *rt;
331
332                 rt = (struct rt6_info *)dst;
333                 t->dst = dst;
334                 t->dst_cookie = rt6_get_cookie(rt);
335                 pr_debug("rt6_dst:%pI6/%d rt6_src:%pI6\n",
336                          &rt->rt6i_dst.addr, rt->rt6i_dst.plen,
337                          &fl6->saddr);
338         } else {
339                 t->dst = NULL;
340
341                 pr_debug("no route\n");
342         }
343 }
344
345 /* Returns the number of consecutive initial bits that match in the 2 ipv6
346  * addresses.
347  */
348 static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
349                                          union sctp_addr *s2)
350 {
351         return ipv6_addr_diff(&s1->v6.sin6_addr, &s2->v6.sin6_addr);
352 }
353
354 /* Fills in the source address(saddr) based on the destination address(daddr)
355  * and asoc's bind address list.
356  */
357 static void sctp_v6_get_saddr(struct sctp_sock *sk,
358                               struct sctp_transport *t,
359                               struct flowi *fl)
360 {
361         struct flowi6 *fl6 = &fl->u.ip6;
362         union sctp_addr *saddr = &t->saddr;
363
364         pr_debug("%s: asoc:%p dst:%p\n", __func__, t->asoc, t->dst);
365
366         if (t->dst) {
367                 saddr->v6.sin6_family = AF_INET6;
368                 saddr->v6.sin6_addr = fl6->saddr;
369         }
370 }
371
372 /* Make a copy of all potential local addresses. */
373 static void sctp_v6_copy_addrlist(struct list_head *addrlist,
374                                   struct net_device *dev)
375 {
376         struct inet6_dev *in6_dev;
377         struct inet6_ifaddr *ifp;
378         struct sctp_sockaddr_entry *addr;
379
380         rcu_read_lock();
381         if ((in6_dev = __in6_dev_get(dev)) == NULL) {
382                 rcu_read_unlock();
383                 return;
384         }
385
386         read_lock_bh(&in6_dev->lock);
387         list_for_each_entry(ifp, &in6_dev->addr_list, if_list) {
388                 /* Add the address to the local list.  */
389                 addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
390                 if (addr) {
391                         addr->a.v6.sin6_family = AF_INET6;
392                         addr->a.v6.sin6_port = 0;
393                         addr->a.v6.sin6_addr = ifp->addr;
394                         addr->a.v6.sin6_scope_id = dev->ifindex;
395                         addr->valid = 1;
396                         INIT_LIST_HEAD(&addr->list);
397                         list_add_tail(&addr->list, addrlist);
398                 }
399         }
400
401         read_unlock_bh(&in6_dev->lock);
402         rcu_read_unlock();
403 }
404
405 /* Initialize a sockaddr_storage from in incoming skb. */
406 static void sctp_v6_from_skb(union sctp_addr *addr, struct sk_buff *skb,
407                              int is_saddr)
408 {
409         __be16 *port;
410         struct sctphdr *sh;
411
412         port = &addr->v6.sin6_port;
413         addr->v6.sin6_family = AF_INET6;
414         addr->v6.sin6_flowinfo = 0; /* FIXME */
415         addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif;
416
417         sh = sctp_hdr(skb);
418         if (is_saddr) {
419                 *port  = sh->source;
420                 addr->v6.sin6_addr = ipv6_hdr(skb)->saddr;
421         } else {
422                 *port = sh->dest;
423                 addr->v6.sin6_addr = ipv6_hdr(skb)->daddr;
424         }
425 }
426
427 /* Initialize an sctp_addr from a socket. */
428 static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk)
429 {
430         addr->v6.sin6_family = AF_INET6;
431         addr->v6.sin6_port = 0;
432         addr->v6.sin6_addr = sk->sk_v6_rcv_saddr;
433 }
434
435 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
436 static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
437 {
438         if (addr->sa.sa_family == AF_INET) {
439                 sk->sk_v6_rcv_saddr.s6_addr32[0] = 0;
440                 sk->sk_v6_rcv_saddr.s6_addr32[1] = 0;
441                 sk->sk_v6_rcv_saddr.s6_addr32[2] = htonl(0x0000ffff);
442                 sk->sk_v6_rcv_saddr.s6_addr32[3] =
443                         addr->v4.sin_addr.s_addr;
444         } else {
445                 sk->sk_v6_rcv_saddr = addr->v6.sin6_addr;
446         }
447 }
448
449 /* Initialize sk->sk_daddr from sctp_addr. */
450 static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
451 {
452         if (addr->sa.sa_family == AF_INET) {
453                 sk->sk_v6_daddr.s6_addr32[0] = 0;
454                 sk->sk_v6_daddr.s6_addr32[1] = 0;
455                 sk->sk_v6_daddr.s6_addr32[2] = htonl(0x0000ffff);
456                 sk->sk_v6_daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
457         } else {
458                 sk->sk_v6_daddr = addr->v6.sin6_addr;
459         }
460 }
461
462 /* Initialize a sctp_addr from an address parameter. */
463 static void sctp_v6_from_addr_param(union sctp_addr *addr,
464                                     union sctp_addr_param *param,
465                                     __be16 port, int iif)
466 {
467         addr->v6.sin6_family = AF_INET6;
468         addr->v6.sin6_port = port;
469         addr->v6.sin6_flowinfo = 0; /* BUG */
470         addr->v6.sin6_addr = param->v6.addr;
471         addr->v6.sin6_scope_id = iif;
472 }
473
474 /* Initialize an address parameter from a sctp_addr and return the length
475  * of the address parameter.
476  */
477 static int sctp_v6_to_addr_param(const union sctp_addr *addr,
478                                  union sctp_addr_param *param)
479 {
480         int length = sizeof(sctp_ipv6addr_param_t);
481
482         param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS;
483         param->v6.param_hdr.length = htons(length);
484         param->v6.addr = addr->v6.sin6_addr;
485
486         return length;
487 }
488
489 /* Initialize a sctp_addr from struct in6_addr. */
490 static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr,
491                               __be16 port)
492 {
493         addr->sa.sa_family = AF_INET6;
494         addr->v6.sin6_port = port;
495         addr->v6.sin6_addr = *saddr;
496 }
497
498 /* Compare addresses exactly.
499  * v4-mapped-v6 is also in consideration.
500  */
501 static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
502                             const union sctp_addr *addr2)
503 {
504         if (addr1->sa.sa_family != addr2->sa.sa_family) {
505                 if (addr1->sa.sa_family == AF_INET &&
506                     addr2->sa.sa_family == AF_INET6 &&
507                     ipv6_addr_v4mapped(&addr2->v6.sin6_addr)) {
508                         if (addr2->v6.sin6_port == addr1->v4.sin_port &&
509                             addr2->v6.sin6_addr.s6_addr32[3] ==
510                             addr1->v4.sin_addr.s_addr)
511                                 return 1;
512                 }
513                 if (addr2->sa.sa_family == AF_INET &&
514                     addr1->sa.sa_family == AF_INET6 &&
515                     ipv6_addr_v4mapped(&addr1->v6.sin6_addr)) {
516                         if (addr1->v6.sin6_port == addr2->v4.sin_port &&
517                             addr1->v6.sin6_addr.s6_addr32[3] ==
518                             addr2->v4.sin_addr.s_addr)
519                                 return 1;
520                 }
521                 return 0;
522         }
523         if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr))
524                 return 0;
525         /* If this is a linklocal address, compare the scope_id. */
526         if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) {
527                 if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id &&
528                     (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) {
529                         return 0;
530                 }
531         }
532
533         return 1;
534 }
535
536 /* Initialize addr struct to INADDR_ANY. */
537 static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port)
538 {
539         memset(addr, 0x00, sizeof(union sctp_addr));
540         addr->v6.sin6_family = AF_INET6;
541         addr->v6.sin6_port = port;
542 }
543
544 /* Is this a wildcard address? */
545 static int sctp_v6_is_any(const union sctp_addr *addr)
546 {
547         return ipv6_addr_any(&addr->v6.sin6_addr);
548 }
549
550 /* Should this be available for binding?   */
551 static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp)
552 {
553         int type;
554         const struct in6_addr *in6 = (const struct in6_addr *)&addr->v6.sin6_addr;
555
556         type = ipv6_addr_type(in6);
557         if (IPV6_ADDR_ANY == type)
558                 return 1;
559         if (type == IPV6_ADDR_MAPPED) {
560                 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
561                         return 0;
562                 sctp_v6_map_v4(addr);
563                 return sctp_get_af_specific(AF_INET)->available(addr, sp);
564         }
565         if (!(type & IPV6_ADDR_UNICAST))
566                 return 0;
567
568         return ipv6_chk_addr(sock_net(&sp->inet.sk), in6, NULL, 0);
569 }
570
571 /* This function checks if the address is a valid address to be used for
572  * SCTP.
573  *
574  * Output:
575  * Return 0 - If the address is a non-unicast or an illegal address.
576  * Return 1 - If the address is a unicast.
577  */
578 static int sctp_v6_addr_valid(union sctp_addr *addr,
579                               struct sctp_sock *sp,
580                               const struct sk_buff *skb)
581 {
582         int ret = ipv6_addr_type(&addr->v6.sin6_addr);
583
584         /* Support v4-mapped-v6 address. */
585         if (ret == IPV6_ADDR_MAPPED) {
586                 /* Note: This routine is used in input, so v4-mapped-v6
587                  * are disallowed here when there is no sctp_sock.
588                  */
589                 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
590                         return 0;
591                 sctp_v6_map_v4(addr);
592                 return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb);
593         }
594
595         /* Is this a non-unicast address */
596         if (!(ret & IPV6_ADDR_UNICAST))
597                 return 0;
598
599         return 1;
600 }
601
602 /* What is the scope of 'addr'?  */
603 static sctp_scope_t sctp_v6_scope(union sctp_addr *addr)
604 {
605         int v6scope;
606         sctp_scope_t retval;
607
608         /* The IPv6 scope is really a set of bit fields.
609          * See IFA_* in <net/if_inet6.h>.  Map to a generic SCTP scope.
610          */
611
612         v6scope = ipv6_addr_scope(&addr->v6.sin6_addr);
613         switch (v6scope) {
614         case IFA_HOST:
615                 retval = SCTP_SCOPE_LOOPBACK;
616                 break;
617         case IFA_LINK:
618                 retval = SCTP_SCOPE_LINK;
619                 break;
620         case IFA_SITE:
621                 retval = SCTP_SCOPE_PRIVATE;
622                 break;
623         default:
624                 retval = SCTP_SCOPE_GLOBAL;
625                 break;
626         }
627
628         return retval;
629 }
630
631 /* Create and initialize a new sk for the socket to be returned by accept(). */
632 static struct sock *sctp_v6_create_accept_sk(struct sock *sk,
633                                              struct sctp_association *asoc)
634 {
635         struct sock *newsk;
636         struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
637         struct sctp6_sock *newsctp6sk;
638
639         newsk = sk_alloc(sock_net(sk), PF_INET6, GFP_KERNEL, sk->sk_prot, 0);
640         if (!newsk)
641                 goto out;
642
643         sock_init_data(NULL, newsk);
644
645         sctp_copy_sock(newsk, sk, asoc);
646         sock_reset_flag(sk, SOCK_ZAPPED);
647
648         newsctp6sk = (struct sctp6_sock *)newsk;
649         inet_sk(newsk)->pinet6 = &newsctp6sk->inet6;
650
651         sctp_sk(newsk)->v4mapped = sctp_sk(sk)->v4mapped;
652
653         newnp = inet6_sk(newsk);
654
655         memcpy(newnp, np, sizeof(struct ipv6_pinfo));
656
657         /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
658          * and getpeername().
659          */
660         sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);
661
662         newsk->sk_v6_rcv_saddr = sk->sk_v6_rcv_saddr;
663
664         sk_refcnt_debug_inc(newsk);
665
666         if (newsk->sk_prot->init(newsk)) {
667                 sk_common_release(newsk);
668                 newsk = NULL;
669         }
670
671 out:
672         return newsk;
673 }
674
675 /* Format a sockaddr for return to user space. This makes sure the return is
676  * AF_INET or AF_INET6 depending on the SCTP_I_WANT_MAPPED_V4_ADDR option.
677  */
678 static int sctp_v6_addr_to_user(struct sctp_sock *sp, union sctp_addr *addr)
679 {
680         if (sp->v4mapped) {
681                 if (addr->sa.sa_family == AF_INET)
682                         sctp_v4_map_v6(addr);
683         } else {
684                 if (addr->sa.sa_family == AF_INET6 &&
685                     ipv6_addr_v4mapped(&addr->v6.sin6_addr))
686                         sctp_v6_map_v4(addr);
687         }
688
689         if (addr->sa.sa_family == AF_INET)
690                 return sizeof(struct sockaddr_in);
691         return sizeof(struct sockaddr_in6);
692 }
693
694 /* Where did this skb come from?  */
695 static int sctp_v6_skb_iif(const struct sk_buff *skb)
696 {
697         struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
698         return opt->iif;
699 }
700
701 /* Was this packet marked by Explicit Congestion Notification? */
702 static int sctp_v6_is_ce(const struct sk_buff *skb)
703 {
704         return *((__u32 *)(ipv6_hdr(skb))) & htonl(1 << 20);
705 }
706
707 /* Dump the v6 addr to the seq file. */
708 static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
709 {
710         seq_printf(seq, "%pI6 ", &addr->v6.sin6_addr);
711 }
712
713 static void sctp_v6_ecn_capable(struct sock *sk)
714 {
715         inet6_sk(sk)->tclass |= INET_ECN_ECT_0;
716 }
717
718 /* Initialize a PF_INET msgname from a ulpevent. */
719 static void sctp_inet6_event_msgname(struct sctp_ulpevent *event,
720                                      char *msgname, int *addrlen)
721 {
722         union sctp_addr *addr;
723         struct sctp_association *asoc;
724         union sctp_addr *paddr;
725
726         if (!msgname)
727                 return;
728
729         addr = (union sctp_addr *)msgname;
730         asoc = event->asoc;
731         paddr = &asoc->peer.primary_addr;
732
733         if (paddr->sa.sa_family == AF_INET) {
734                 addr->v4.sin_family = AF_INET;
735                 addr->v4.sin_port = htons(asoc->peer.port);
736                 addr->v4.sin_addr = paddr->v4.sin_addr;
737         } else {
738                 addr->v6.sin6_family = AF_INET6;
739                 addr->v6.sin6_flowinfo = 0;
740                 if (ipv6_addr_type(&paddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
741                         addr->v6.sin6_scope_id = paddr->v6.sin6_scope_id;
742                 else
743                         addr->v6.sin6_scope_id = 0;
744                 addr->v6.sin6_port = htons(asoc->peer.port);
745                 addr->v6.sin6_addr = paddr->v6.sin6_addr;
746         }
747
748         *addrlen = sctp_v6_addr_to_user(sctp_sk(asoc->base.sk), addr);
749 }
750
751 /* Initialize a msg_name from an inbound skb. */
752 static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname,
753                                    int *addr_len)
754 {
755         union sctp_addr *addr;
756         struct sctphdr *sh;
757
758         if (!msgname)
759                 return;
760
761         addr = (union sctp_addr *)msgname;
762         sh = sctp_hdr(skb);
763
764         if (ip_hdr(skb)->version == 4) {
765                 addr->v4.sin_family = AF_INET;
766                 addr->v4.sin_port = sh->source;
767                 addr->v4.sin_addr.s_addr =  ip_hdr(skb)->saddr;
768         } else {
769                 addr->v6.sin6_family = AF_INET6;
770                 addr->v6.sin6_flowinfo = 0;
771                 addr->v6.sin6_port = sh->source;
772                 addr->v6.sin6_addr = ipv6_hdr(skb)->saddr;
773                 if (ipv6_addr_type(&addr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) {
774                         struct sctp_ulpevent *ev = sctp_skb2event(skb);
775                         addr->v6.sin6_scope_id = ev->iif;
776                 }
777         }
778
779         *addr_len = sctp_v6_addr_to_user(sctp_sk(skb->sk), addr);
780 }
781
782 /* Do we support this AF? */
783 static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp)
784 {
785         switch (family) {
786         case AF_INET6:
787                 return 1;
788         /* v4-mapped-v6 addresses */
789         case AF_INET:
790                 if (!__ipv6_only_sock(sctp_opt2sk(sp)))
791                         return 1;
792         default:
793                 return 0;
794         }
795 }
796
797 /* Address matching with wildcards allowed.  This extra level
798  * of indirection lets us choose whether a PF_INET6 should
799  * disallow any v4 addresses if we so choose.
800  */
801 static int sctp_inet6_cmp_addr(const union sctp_addr *addr1,
802                                const union sctp_addr *addr2,
803                                struct sctp_sock *opt)
804 {
805         struct sctp_af *af1, *af2;
806         struct sock *sk = sctp_opt2sk(opt);
807
808         af1 = sctp_get_af_specific(addr1->sa.sa_family);
809         af2 = sctp_get_af_specific(addr2->sa.sa_family);
810
811         if (!af1 || !af2)
812                 return 0;
813
814         /* If the socket is IPv6 only, v4 addrs will not match */
815         if (__ipv6_only_sock(sk) && af1 != af2)
816                 return 0;
817
818         /* Today, wildcard AF_INET/AF_INET6. */
819         if (sctp_is_any(sk, addr1) || sctp_is_any(sk, addr2))
820                 return 1;
821
822         if (addr1->sa.sa_family != addr2->sa.sa_family)
823                 return 0;
824
825         return af1->cmp_addr(addr1, addr2);
826 }
827
828 /* Verify that the provided sockaddr looks bindable.   Common verification,
829  * has already been taken care of.
830  */
831 static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
832 {
833         struct sctp_af *af;
834
835         /* ASSERT: address family has already been verified. */
836         if (addr->sa.sa_family != AF_INET6)
837                 af = sctp_get_af_specific(addr->sa.sa_family);
838         else {
839                 int type = ipv6_addr_type(&addr->v6.sin6_addr);
840                 struct net_device *dev;
841
842                 if (type & IPV6_ADDR_LINKLOCAL) {
843                         struct net *net;
844                         if (!addr->v6.sin6_scope_id)
845                                 return 0;
846                         net = sock_net(&opt->inet.sk);
847                         rcu_read_lock();
848                         dev = dev_get_by_index_rcu(net, addr->v6.sin6_scope_id);
849                         if (!dev ||
850                             !ipv6_chk_addr(net, &addr->v6.sin6_addr, dev, 0)) {
851                                 rcu_read_unlock();
852                                 return 0;
853                         }
854                         rcu_read_unlock();
855                 }
856
857                 af = opt->pf->af;
858         }
859         return af->available(addr, opt);
860 }
861
862 /* Verify that the provided sockaddr looks sendable.   Common verification,
863  * has already been taken care of.
864  */
865 static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
866 {
867         struct sctp_af *af = NULL;
868
869         /* ASSERT: address family has already been verified. */
870         if (addr->sa.sa_family != AF_INET6)
871                 af = sctp_get_af_specific(addr->sa.sa_family);
872         else {
873                 int type = ipv6_addr_type(&addr->v6.sin6_addr);
874                 struct net_device *dev;
875
876                 if (type & IPV6_ADDR_LINKLOCAL) {
877                         if (!addr->v6.sin6_scope_id)
878                                 return 0;
879                         rcu_read_lock();
880                         dev = dev_get_by_index_rcu(sock_net(&opt->inet.sk),
881                                                    addr->v6.sin6_scope_id);
882                         rcu_read_unlock();
883                         if (!dev)
884                                 return 0;
885                 }
886                 af = opt->pf->af;
887         }
888
889         return af != NULL;
890 }
891
892 /* Fill in Supported Address Type information for INIT and INIT-ACK
893  * chunks.   Note: In the future, we may want to look at sock options
894  * to determine whether a PF_INET6 socket really wants to have IPV4
895  * addresses.
896  * Returns number of addresses supported.
897  */
898 static int sctp_inet6_supported_addrs(const struct sctp_sock *opt,
899                                       __be16 *types)
900 {
901         types[0] = SCTP_PARAM_IPV6_ADDRESS;
902         if (!opt || !ipv6_only_sock(sctp_opt2sk(opt))) {
903                 types[1] = SCTP_PARAM_IPV4_ADDRESS;
904                 return 2;
905         }
906         return 1;
907 }
908
909 /* Handle SCTP_I_WANT_MAPPED_V4_ADDR for getpeername() and getsockname() */
910 static int sctp_getname(struct socket *sock, struct sockaddr *uaddr,
911                         int *uaddr_len, int peer)
912 {
913         int rc;
914
915         rc = inet6_getname(sock, uaddr, uaddr_len, peer);
916
917         if (rc != 0)
918                 return rc;
919
920         *uaddr_len = sctp_v6_addr_to_user(sctp_sk(sock->sk),
921                                           (union sctp_addr *)uaddr);
922
923         return rc;
924 }
925
926 static const struct proto_ops inet6_seqpacket_ops = {
927         .family            = PF_INET6,
928         .owner             = THIS_MODULE,
929         .release           = inet6_release,
930         .bind              = inet6_bind,
931         .connect           = inet_dgram_connect,
932         .socketpair        = sock_no_socketpair,
933         .accept            = inet_accept,
934         .getname           = sctp_getname,
935         .poll              = sctp_poll,
936         .ioctl             = inet6_ioctl,
937         .listen            = sctp_inet_listen,
938         .shutdown          = inet_shutdown,
939         .setsockopt        = sock_common_setsockopt,
940         .getsockopt        = sock_common_getsockopt,
941         .sendmsg           = inet_sendmsg,
942         .recvmsg           = sock_common_recvmsg,
943         .mmap              = sock_no_mmap,
944 #ifdef CONFIG_COMPAT
945         .compat_setsockopt = compat_sock_common_setsockopt,
946         .compat_getsockopt = compat_sock_common_getsockopt,
947 #endif
948 };
949
950 static struct inet_protosw sctpv6_seqpacket_protosw = {
951         .type          = SOCK_SEQPACKET,
952         .protocol      = IPPROTO_SCTP,
953         .prot          = &sctpv6_prot,
954         .ops           = &inet6_seqpacket_ops,
955         .flags         = SCTP_PROTOSW_FLAG
956 };
957 static struct inet_protosw sctpv6_stream_protosw = {
958         .type          = SOCK_STREAM,
959         .protocol      = IPPROTO_SCTP,
960         .prot          = &sctpv6_prot,
961         .ops           = &inet6_seqpacket_ops,
962         .flags         = SCTP_PROTOSW_FLAG,
963 };
964
965 static int sctp6_rcv(struct sk_buff *skb)
966 {
967         return sctp_rcv(skb) ? -1 : 0;
968 }
969
970 static const struct inet6_protocol sctpv6_protocol = {
971         .handler      = sctp6_rcv,
972         .err_handler  = sctp_v6_err,
973         .flags        = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
974 };
975
976 static struct sctp_af sctp_af_inet6 = {
977         .sa_family         = AF_INET6,
978         .sctp_xmit         = sctp_v6_xmit,
979         .setsockopt        = ipv6_setsockopt,
980         .getsockopt        = ipv6_getsockopt,
981         .get_dst           = sctp_v6_get_dst,
982         .get_saddr         = sctp_v6_get_saddr,
983         .copy_addrlist     = sctp_v6_copy_addrlist,
984         .from_skb          = sctp_v6_from_skb,
985         .from_sk           = sctp_v6_from_sk,
986         .from_addr_param   = sctp_v6_from_addr_param,
987         .to_addr_param     = sctp_v6_to_addr_param,
988         .cmp_addr          = sctp_v6_cmp_addr,
989         .scope             = sctp_v6_scope,
990         .addr_valid        = sctp_v6_addr_valid,
991         .inaddr_any        = sctp_v6_inaddr_any,
992         .is_any            = sctp_v6_is_any,
993         .available         = sctp_v6_available,
994         .skb_iif           = sctp_v6_skb_iif,
995         .is_ce             = sctp_v6_is_ce,
996         .seq_dump_addr     = sctp_v6_seq_dump_addr,
997         .ecn_capable       = sctp_v6_ecn_capable,
998         .net_header_len    = sizeof(struct ipv6hdr),
999         .sockaddr_len      = sizeof(struct sockaddr_in6),
1000 #ifdef CONFIG_COMPAT
1001         .compat_setsockopt = compat_ipv6_setsockopt,
1002         .compat_getsockopt = compat_ipv6_getsockopt,
1003 #endif
1004 };
1005
1006 static struct sctp_pf sctp_pf_inet6 = {
1007         .event_msgname = sctp_inet6_event_msgname,
1008         .skb_msgname   = sctp_inet6_skb_msgname,
1009         .af_supported  = sctp_inet6_af_supported,
1010         .cmp_addr      = sctp_inet6_cmp_addr,
1011         .bind_verify   = sctp_inet6_bind_verify,
1012         .send_verify   = sctp_inet6_send_verify,
1013         .supported_addrs = sctp_inet6_supported_addrs,
1014         .create_accept_sk = sctp_v6_create_accept_sk,
1015         .addr_to_user  = sctp_v6_addr_to_user,
1016         .to_sk_saddr   = sctp_v6_to_sk_saddr,
1017         .to_sk_daddr   = sctp_v6_to_sk_daddr,
1018         .af            = &sctp_af_inet6,
1019 };
1020
1021 /* Initialize IPv6 support and register with socket layer.  */
1022 void sctp_v6_pf_init(void)
1023 {
1024         /* Register the SCTP specific PF_INET6 functions. */
1025         sctp_register_pf(&sctp_pf_inet6, PF_INET6);
1026
1027         /* Register the SCTP specific AF_INET6 functions. */
1028         sctp_register_af(&sctp_af_inet6);
1029 }
1030
1031 void sctp_v6_pf_exit(void)
1032 {
1033         list_del(&sctp_af_inet6.list);
1034 }
1035
1036 /* Initialize IPv6 support and register with socket layer.  */
1037 int sctp_v6_protosw_init(void)
1038 {
1039         int rc;
1040
1041         rc = proto_register(&sctpv6_prot, 1);
1042         if (rc)
1043                 return rc;
1044
1045         /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
1046         inet6_register_protosw(&sctpv6_seqpacket_protosw);
1047         inet6_register_protosw(&sctpv6_stream_protosw);
1048
1049         return 0;
1050 }
1051
1052 void sctp_v6_protosw_exit(void)
1053 {
1054         inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
1055         inet6_unregister_protosw(&sctpv6_stream_protosw);
1056         proto_unregister(&sctpv6_prot);
1057 }
1058
1059
1060 /* Register with inet6 layer. */
1061 int sctp_v6_add_protocol(void)
1062 {
1063         /* Register notifier for inet6 address additions/deletions. */
1064         register_inet6addr_notifier(&sctp_inet6addr_notifier);
1065
1066         if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0)
1067                 return -EAGAIN;
1068
1069         return 0;
1070 }
1071
1072 /* Unregister with inet6 layer. */
1073 void sctp_v6_del_protocol(void)
1074 {
1075         inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP);
1076         unregister_inet6addr_notifier(&sctp_inet6addr_notifier);
1077 }