SUNRPC: don't map EKEYEXPIRED to EACCES in call_refreshresult
[linux-3.10.git] / net / sctp / ipv6.c
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, write to
25  * the Free Software Foundation, 59 Temple Place - Suite 330,
26  * Boston, MA 02111-1307, USA.
27  *
28  * Please send any bug reports or fixes you make to the
29  * email address(es):
30  *    lksctp developers <lksctp-developers@lists.sourceforge.net>
31  *
32  * Or submit a bug report through the following website:
33  *    http://www.sf.net/projects/lksctp
34  *
35  * Written or modified by:
36  *    Le Yanqun             <yanqun.le@nokia.com>
37  *    Hui Huang             <hui.huang@nokia.com>
38  *    La Monte H.P. Yarroll <piggy@acm.org>
39  *    Sridhar Samudrala     <sri@us.ibm.com>
40  *    Jon Grimm             <jgrimm@us.ibm.com>
41  *    Ardelle Fan           <ardelle.fan@intel.com>
42  *
43  * Based on:
44  *      linux/net/ipv6/tcp_ipv6.c
45  *
46  * Any bugs reported given to us we will try to fix... any fixes shared will
47  * be incorporated into the next SCTP release.
48  */
49
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
83 static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
84                                          union sctp_addr *s2);
85 static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr,
86                               __be16 port);
87 static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
88                             const union sctp_addr *addr2);
89
90 /* Event handler for inet6 address addition/deletion events.
91  * The sctp_local_addr_list needs to be protocted by a spin lock since
92  * multiple notifiers (say IPv4 and IPv6) may be running at the same
93  * time and thus corrupt the list.
94  * The reader side is protected with RCU.
95  */
96 static 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
143 static struct notifier_block sctp_inet6addr_notifier = {
144         .notifier_call = sctp_inet6addr_event,
145 };
146
147 /* ICMP error handler. */
148 SCTP_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         /* Fix up skb to look at the embedded net header. */
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         /* Put back, the original pointers. */
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         /* Warning:  The sock lock is held.  Remember to call
177          * sctp_err_finish!
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                 goto out_unlock;
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 {  /* Only an error on timeout */
203                 sk->sk_err_soft = err;
204         }
205
206 out_unlock:
207         sctp_err_finish(sk, asoc);
208 out:
209         if (likely(idev != NULL))
210                 in6_dev_put(idev);
211 }
212
213 static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport)
214 {
215         struct sock *sk = skb->sk;
216         struct ipv6_pinfo *np = inet6_sk(sk);
217         struct flowi6 *fl6 = &transport->fl.u.ip6;
218
219         SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n",
220                           __func__, skb, skb->len,
221                           &fl6->saddr, &fl6->daddr);
222
223         IP6_ECN_flow_xmit(sk, fl6->flowlabel);
224
225         if (!(transport->param_flags & SPP_PMTUD_ENABLE))
226                 skb->local_df = 1;
227
228         SCTP_INC_STATS(sock_net(sk), SCTP_MIB_OUTSCTPPACKS);
229
230         return ip6_xmit(sk, skb, fl6, np->opt, np->tclass);
231 }
232
233 /* Returns the dst cache entry for the given source and destination ip
234  * addresses.
235  */
236 static void sctp_v6_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
237                             struct flowi *fl, struct sock *sk)
238 {
239         struct sctp_association *asoc = t->asoc;
240         struct dst_entry *dst = NULL;
241         struct flowi6 *fl6 = &fl->u.ip6;
242         struct sctp_bind_addr *bp;
243         struct ipv6_pinfo *np = inet6_sk(sk);
244         struct sctp_sockaddr_entry *laddr;
245         union sctp_addr *baddr = NULL;
246         union sctp_addr *daddr = &t->ipaddr;
247         union sctp_addr dst_saddr;
248         struct in6_addr *final_p, final;
249         __u8 matchlen = 0;
250         __u8 bmatchlen;
251         sctp_scope_t scope;
252
253         memset(fl6, 0, sizeof(struct flowi6));
254         fl6->daddr = daddr->v6.sin6_addr;
255         fl6->fl6_dport = daddr->v6.sin6_port;
256         fl6->flowi6_proto = IPPROTO_SCTP;
257         if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
258                 fl6->flowi6_oif = daddr->v6.sin6_scope_id;
259
260         SCTP_DEBUG_PRINTK("%s: DST=%pI6 ", __func__, &fl6->daddr);
261
262         if (asoc)
263                 fl6->fl6_sport = htons(asoc->base.bind_addr.port);
264
265         if (saddr) {
266                 fl6->saddr = saddr->v6.sin6_addr;
267                 fl6->fl6_sport = saddr->v6.sin6_port;
268                 SCTP_DEBUG_PRINTK("SRC=%pI6 - ", &fl6->saddr);
269         }
270
271         final_p = fl6_update_dst(fl6, np->opt, &final);
272         dst = ip6_dst_lookup_flow(sk, fl6, final_p, false);
273         if (!asoc || saddr)
274                 goto out;
275
276         bp = &asoc->base.bind_addr;
277         scope = sctp_scope(daddr);
278         /* ip6_dst_lookup has filled in the fl6->saddr for us.  Check
279          * to see if we can use it.
280          */
281         if (!IS_ERR(dst)) {
282                 /* Walk through the bind address list and look for a bind
283                  * address that matches the source address of the returned dst.
284                  */
285                 sctp_v6_to_addr(&dst_saddr, &fl6->saddr, htons(bp->port));
286                 rcu_read_lock();
287                 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
288                         if (!laddr->valid || (laddr->state != SCTP_ADDR_SRC))
289                                 continue;
290
291                         /* Do not compare against v4 addrs */
292                         if ((laddr->a.sa.sa_family == AF_INET6) &&
293                             (sctp_v6_cmp_addr(&dst_saddr, &laddr->a))) {
294                                 rcu_read_unlock();
295                                 goto out;
296                         }
297                 }
298                 rcu_read_unlock();
299                 /* None of the bound addresses match the source address of the
300                  * dst. So release it.
301                  */
302                 dst_release(dst);
303                 dst = NULL;
304         }
305
306         /* Walk through the bind address list and try to get the
307          * best source address for a given destination.
308          */
309         rcu_read_lock();
310         list_for_each_entry_rcu(laddr, &bp->address_list, list) {
311                 if (!laddr->valid)
312                         continue;
313                 if ((laddr->state == SCTP_ADDR_SRC) &&
314                     (laddr->a.sa.sa_family == AF_INET6) &&
315                     (scope <= sctp_scope(&laddr->a))) {
316                         bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a);
317                         if (!baddr || (matchlen < bmatchlen)) {
318                                 baddr = &laddr->a;
319                                 matchlen = bmatchlen;
320                         }
321                 }
322         }
323         rcu_read_unlock();
324
325         if (baddr) {
326                 fl6->saddr = baddr->v6.sin6_addr;
327                 fl6->fl6_sport = baddr->v6.sin6_port;
328                 final_p = fl6_update_dst(fl6, np->opt, &final);
329                 dst = ip6_dst_lookup_flow(sk, fl6, final_p, false);
330         }
331
332 out:
333         if (!IS_ERR_OR_NULL(dst)) {
334                 struct rt6_info *rt;
335                 rt = (struct rt6_info *)dst;
336                 t->dst = dst;
337                 SCTP_DEBUG_PRINTK("rt6_dst:%pI6 rt6_src:%pI6\n",
338                         &rt->rt6i_dst.addr, &fl6->saddr);
339         } else {
340                 t->dst = NULL;
341                 SCTP_DEBUG_PRINTK("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         SCTP_DEBUG_PRINTK("%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 = t_new(struct sctp_sockaddr_entry, 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 = inet6_sk(sk)->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 && sctp_sk(sk)->v4mapped) {
439                 inet6_sk(sk)->rcv_saddr.s6_addr32[0] = 0;
440                 inet6_sk(sk)->rcv_saddr.s6_addr32[1] = 0;
441                 inet6_sk(sk)->rcv_saddr.s6_addr32[2] = htonl(0x0000ffff);
442                 inet6_sk(sk)->rcv_saddr.s6_addr32[3] =
443                         addr->v4.sin_addr.s_addr;
444         } else {
445                 inet6_sk(sk)->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 && sctp_sk(sk)->v4mapped) {
453                 inet6_sk(sk)->daddr.s6_addr32[0] = 0;
454                 inet6_sk(sk)->daddr.s6_addr32[1] = 0;
455                 inet6_sk(sk)->daddr.s6_addr32[2] = htonl(0x0000ffff);
456                 inet6_sk(sk)->daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
457         } else {
458                 inet6_sk(sk)->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 && !sp->v4mapped)
561                         return 0;
562                 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
563                         return 0;
564                 sctp_v6_map_v4(addr);
565                 return sctp_get_af_specific(AF_INET)->available(addr, sp);
566         }
567         if (!(type & IPV6_ADDR_UNICAST))
568                 return 0;
569
570         return ipv6_chk_addr(sock_net(&sp->inet.sk), in6, NULL, 0);
571 }
572
573 /* This function checks if the address is a valid address to be used for
574  * SCTP.
575  *
576  * Output:
577  * Return 0 - If the address is a non-unicast or an illegal address.
578  * Return 1 - If the address is a unicast.
579  */
580 static int sctp_v6_addr_valid(union sctp_addr *addr,
581                               struct sctp_sock *sp,
582                               const struct sk_buff *skb)
583 {
584         int ret = ipv6_addr_type(&addr->v6.sin6_addr);
585
586         /* Support v4-mapped-v6 address. */
587         if (ret == IPV6_ADDR_MAPPED) {
588                 /* Note: This routine is used in input, so v4-mapped-v6
589                  * are disallowed here when there is no sctp_sock.
590                  */
591                 if (!sp || !sp->v4mapped)
592                         return 0;
593                 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
594                         return 0;
595                 sctp_v6_map_v4(addr);
596                 return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb);
597         }
598
599         /* Is this a non-unicast address */
600         if (!(ret & IPV6_ADDR_UNICAST))
601                 return 0;
602
603         return 1;
604 }
605
606 /* What is the scope of 'addr'?  */
607 static sctp_scope_t sctp_v6_scope(union sctp_addr *addr)
608 {
609         int v6scope;
610         sctp_scope_t retval;
611
612         /* The IPv6 scope is really a set of bit fields.
613          * See IFA_* in <net/if_inet6.h>.  Map to a generic SCTP scope.
614          */
615
616         v6scope = ipv6_addr_scope(&addr->v6.sin6_addr);
617         switch (v6scope) {
618         case IFA_HOST:
619                 retval = SCTP_SCOPE_LOOPBACK;
620                 break;
621         case IFA_LINK:
622                 retval = SCTP_SCOPE_LINK;
623                 break;
624         case IFA_SITE:
625                 retval = SCTP_SCOPE_PRIVATE;
626                 break;
627         default:
628                 retval = SCTP_SCOPE_GLOBAL;
629                 break;
630         }
631
632         return retval;
633 }
634
635 /* Create and initialize a new sk for the socket to be returned by accept(). */
636 static struct sock *sctp_v6_create_accept_sk(struct sock *sk,
637                                              struct sctp_association *asoc)
638 {
639         struct sock *newsk;
640         struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
641         struct sctp6_sock *newsctp6sk;
642
643         newsk = sk_alloc(sock_net(sk), PF_INET6, GFP_KERNEL, sk->sk_prot);
644         if (!newsk)
645                 goto out;
646
647         sock_init_data(NULL, newsk);
648
649         sctp_copy_sock(newsk, sk, asoc);
650         sock_reset_flag(sk, SOCK_ZAPPED);
651
652         newsctp6sk = (struct sctp6_sock *)newsk;
653         inet_sk(newsk)->pinet6 = &newsctp6sk->inet6;
654
655         sctp_sk(newsk)->v4mapped = sctp_sk(sk)->v4mapped;
656
657         newnp = inet6_sk(newsk);
658
659         memcpy(newnp, np, sizeof(struct ipv6_pinfo));
660
661         /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
662          * and getpeername().
663          */
664         sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);
665
666         sk_refcnt_debug_inc(newsk);
667
668         if (newsk->sk_prot->init(newsk)) {
669                 sk_common_release(newsk);
670                 newsk = NULL;
671         }
672
673 out:
674         return newsk;
675 }
676
677 /* Map v4 address to mapped v6 address */
678 static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
679 {
680         if (sp->v4mapped && AF_INET == addr->sa.sa_family)
681                 sctp_v4_map_v6(addr);
682 }
683
684 /* Where did this skb come from?  */
685 static int sctp_v6_skb_iif(const struct sk_buff *skb)
686 {
687         struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
688         return opt->iif;
689 }
690
691 /* Was this packet marked by Explicit Congestion Notification? */
692 static int sctp_v6_is_ce(const struct sk_buff *skb)
693 {
694         return *((__u32 *)(ipv6_hdr(skb))) & htonl(1 << 20);
695 }
696
697 /* Dump the v6 addr to the seq file. */
698 static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
699 {
700         seq_printf(seq, "%pI6 ", &addr->v6.sin6_addr);
701 }
702
703 static void sctp_v6_ecn_capable(struct sock *sk)
704 {
705         inet6_sk(sk)->tclass |= INET_ECN_ECT_0;
706 }
707
708 /* Initialize a PF_INET6 socket msg_name. */
709 static void sctp_inet6_msgname(char *msgname, int *addr_len)
710 {
711         struct sockaddr_in6 *sin6;
712
713         sin6 = (struct sockaddr_in6 *)msgname;
714         sin6->sin6_family = AF_INET6;
715         sin6->sin6_flowinfo = 0;
716         sin6->sin6_scope_id = 0; /*FIXME */
717         *addr_len = sizeof(struct sockaddr_in6);
718 }
719
720 /* Initialize a PF_INET msgname from a ulpevent. */
721 static void sctp_inet6_event_msgname(struct sctp_ulpevent *event,
722                                      char *msgname, int *addrlen)
723 {
724         struct sockaddr_in6 *sin6, *sin6from;
725
726         if (msgname) {
727                 union sctp_addr *addr;
728                 struct sctp_association *asoc;
729
730                 asoc = event->asoc;
731                 sctp_inet6_msgname(msgname, addrlen);
732                 sin6 = (struct sockaddr_in6 *)msgname;
733                 sin6->sin6_port = htons(asoc->peer.port);
734                 addr = &asoc->peer.primary_addr;
735
736                 /* Note: If we go to a common v6 format, this code
737                  * will change.
738                  */
739
740                 /* Map ipv4 address into v4-mapped-on-v6 address.  */
741                 if (sctp_sk(asoc->base.sk)->v4mapped &&
742                     AF_INET == addr->sa.sa_family) {
743                         sctp_v4_map_v6((union sctp_addr *)sin6);
744                         sin6->sin6_addr.s6_addr32[3] =
745                                 addr->v4.sin_addr.s_addr;
746                         return;
747                 }
748
749                 sin6from = &asoc->peer.primary_addr.v6;
750                 sin6->sin6_addr = sin6from->sin6_addr;
751                 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
752                         sin6->sin6_scope_id = sin6from->sin6_scope_id;
753         }
754 }
755
756 /* Initialize a msg_name from an inbound skb. */
757 static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname,
758                                    int *addr_len)
759 {
760         struct sctphdr *sh;
761         struct sockaddr_in6 *sin6;
762
763         if (msgname) {
764                 sctp_inet6_msgname(msgname, addr_len);
765                 sin6 = (struct sockaddr_in6 *)msgname;
766                 sh = sctp_hdr(skb);
767                 sin6->sin6_port = sh->source;
768
769                 /* Map ipv4 address into v4-mapped-on-v6 address. */
770                 if (sctp_sk(skb->sk)->v4mapped &&
771                     ip_hdr(skb)->version == 4) {
772                         sctp_v4_map_v6((union sctp_addr *)sin6);
773                         sin6->sin6_addr.s6_addr32[3] = ip_hdr(skb)->saddr;
774                         return;
775                 }
776
777                 /* Otherwise, just copy the v6 address. */
778                 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
779                 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) {
780                         struct sctp_ulpevent *ev = sctp_skb2event(skb);
781                         sin6->sin6_scope_id = ev->iif;
782                 }
783         }
784 }
785
786 /* Do we support this AF? */
787 static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp)
788 {
789         switch (family) {
790         case AF_INET6:
791                 return 1;
792         /* v4-mapped-v6 addresses */
793         case AF_INET:
794                 if (!__ipv6_only_sock(sctp_opt2sk(sp)))
795                         return 1;
796         default:
797                 return 0;
798         }
799 }
800
801 /* Address matching with wildcards allowed.  This extra level
802  * of indirection lets us choose whether a PF_INET6 should
803  * disallow any v4 addresses if we so choose.
804  */
805 static int sctp_inet6_cmp_addr(const union sctp_addr *addr1,
806                                const union sctp_addr *addr2,
807                                struct sctp_sock *opt)
808 {
809         struct sctp_af *af1, *af2;
810         struct sock *sk = sctp_opt2sk(opt);
811
812         af1 = sctp_get_af_specific(addr1->sa.sa_family);
813         af2 = sctp_get_af_specific(addr2->sa.sa_family);
814
815         if (!af1 || !af2)
816                 return 0;
817
818         /* If the socket is IPv6 only, v4 addrs will not match */
819         if (__ipv6_only_sock(sk) && af1 != af2)
820                 return 0;
821
822         /* Today, wildcard AF_INET/AF_INET6. */
823         if (sctp_is_any(sk, addr1) || sctp_is_any(sk, addr2))
824                 return 1;
825
826         if (addr1->sa.sa_family != addr2->sa.sa_family)
827                 return 0;
828
829         return af1->cmp_addr(addr1, addr2);
830 }
831
832 /* Verify that the provided sockaddr looks bindable.   Common verification,
833  * has already been taken care of.
834  */
835 static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
836 {
837         struct sctp_af *af;
838
839         /* ASSERT: address family has already been verified. */
840         if (addr->sa.sa_family != AF_INET6)
841                 af = sctp_get_af_specific(addr->sa.sa_family);
842         else {
843                 int type = ipv6_addr_type(&addr->v6.sin6_addr);
844                 struct net_device *dev;
845
846                 if (type & IPV6_ADDR_LINKLOCAL) {
847                         struct net *net;
848                         if (!addr->v6.sin6_scope_id)
849                                 return 0;
850                         net = sock_net(&opt->inet.sk);
851                         rcu_read_lock();
852                         dev = dev_get_by_index_rcu(net, addr->v6.sin6_scope_id);
853                         if (!dev ||
854                             !ipv6_chk_addr(net, &addr->v6.sin6_addr, dev, 0)) {
855                                 rcu_read_unlock();
856                                 return 0;
857                         }
858                         rcu_read_unlock();
859                 } else if (type == IPV6_ADDR_MAPPED) {
860                         if (!opt->v4mapped)
861                                 return 0;
862                 }
863
864                 af = opt->pf->af;
865         }
866         return af->available(addr, opt);
867 }
868
869 /* Verify that the provided sockaddr looks sendable.   Common verification,
870  * has already been taken care of.
871  */
872 static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
873 {
874         struct sctp_af *af = NULL;
875
876         /* ASSERT: address family has already been verified. */
877         if (addr->sa.sa_family != AF_INET6)
878                 af = sctp_get_af_specific(addr->sa.sa_family);
879         else {
880                 int type = ipv6_addr_type(&addr->v6.sin6_addr);
881                 struct net_device *dev;
882
883                 if (type & IPV6_ADDR_LINKLOCAL) {
884                         if (!addr->v6.sin6_scope_id)
885                                 return 0;
886                         rcu_read_lock();
887                         dev = dev_get_by_index_rcu(sock_net(&opt->inet.sk),
888                                                    addr->v6.sin6_scope_id);
889                         rcu_read_unlock();
890                         if (!dev)
891                                 return 0;
892                 }
893                 af = opt->pf->af;
894         }
895
896         return af != NULL;
897 }
898
899 /* Fill in Supported Address Type information for INIT and INIT-ACK
900  * chunks.   Note: In the future, we may want to look at sock options
901  * to determine whether a PF_INET6 socket really wants to have IPV4
902  * addresses.
903  * Returns number of addresses supported.
904  */
905 static int sctp_inet6_supported_addrs(const struct sctp_sock *opt,
906                                       __be16 *types)
907 {
908         types[0] = SCTP_PARAM_IPV6_ADDRESS;
909         if (!opt || !ipv6_only_sock(sctp_opt2sk(opt))) {
910                 types[1] = SCTP_PARAM_IPV4_ADDRESS;
911                 return 2;
912         }
913         return 1;
914 }
915
916 static const struct proto_ops inet6_seqpacket_ops = {
917         .family            = PF_INET6,
918         .owner             = THIS_MODULE,
919         .release           = inet6_release,
920         .bind              = inet6_bind,
921         .connect           = inet_dgram_connect,
922         .socketpair        = sock_no_socketpair,
923         .accept            = inet_accept,
924         .getname           = inet6_getname,
925         .poll              = sctp_poll,
926         .ioctl             = inet6_ioctl,
927         .listen            = sctp_inet_listen,
928         .shutdown          = inet_shutdown,
929         .setsockopt        = sock_common_setsockopt,
930         .getsockopt        = sock_common_getsockopt,
931         .sendmsg           = inet_sendmsg,
932         .recvmsg           = sock_common_recvmsg,
933         .mmap              = sock_no_mmap,
934 #ifdef CONFIG_COMPAT
935         .compat_setsockopt = compat_sock_common_setsockopt,
936         .compat_getsockopt = compat_sock_common_getsockopt,
937 #endif
938 };
939
940 static struct inet_protosw sctpv6_seqpacket_protosw = {
941         .type          = SOCK_SEQPACKET,
942         .protocol      = IPPROTO_SCTP,
943         .prot          = &sctpv6_prot,
944         .ops           = &inet6_seqpacket_ops,
945         .no_check      = 0,
946         .flags         = SCTP_PROTOSW_FLAG
947 };
948 static struct inet_protosw sctpv6_stream_protosw = {
949         .type          = SOCK_STREAM,
950         .protocol      = IPPROTO_SCTP,
951         .prot          = &sctpv6_prot,
952         .ops           = &inet6_seqpacket_ops,
953         .no_check      = 0,
954         .flags         = SCTP_PROTOSW_FLAG,
955 };
956
957 static int sctp6_rcv(struct sk_buff *skb)
958 {
959         return sctp_rcv(skb) ? -1 : 0;
960 }
961
962 static const 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
968 static struct sctp_af sctp_af_inet6 = {
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         .cmp_addr          = sctp_v6_cmp_addr,
983         .scope             = sctp_v6_scope,
984         .addr_valid        = sctp_v6_addr_valid,
985         .inaddr_any        = sctp_v6_inaddr_any,
986         .is_any            = sctp_v6_is_any,
987         .available         = sctp_v6_available,
988         .skb_iif           = sctp_v6_skb_iif,
989         .is_ce             = sctp_v6_is_ce,
990         .seq_dump_addr     = sctp_v6_seq_dump_addr,
991         .ecn_capable       = sctp_v6_ecn_capable,
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
1000 static struct sctp_pf sctp_pf_inet6 = {
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_af_inet6,
1011 };
1012
1013 /* Initialize IPv6 support and register with socket layer.  */
1014 void sctp_v6_pf_init(void)
1015 {
1016         /* Register the SCTP specific PF_INET6 functions. */
1017         sctp_register_pf(&sctp_pf_inet6, PF_INET6);
1018
1019         /* Register the SCTP specific AF_INET6 functions. */
1020         sctp_register_af(&sctp_af_inet6);
1021 }
1022
1023 void sctp_v6_pf_exit(void)
1024 {
1025         list_del(&sctp_af_inet6.list);
1026 }
1027
1028 /* Initialize IPv6 support and register with socket layer.  */
1029 int sctp_v6_protosw_init(void)
1030 {
1031         int rc;
1032
1033         rc = proto_register(&sctpv6_prot, 1);
1034         if (rc)
1035                 return rc;
1036
1037         /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
1038         inet6_register_protosw(&sctpv6_seqpacket_protosw);
1039         inet6_register_protosw(&sctpv6_stream_protosw);
1040
1041         return 0;
1042 }
1043
1044 void sctp_v6_protosw_exit(void)
1045 {
1046         inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
1047         inet6_unregister_protosw(&sctpv6_stream_protosw);
1048         proto_unregister(&sctpv6_prot);
1049 }
1050
1051
1052 /* Register with inet6 layer. */
1053 int sctp_v6_add_protocol(void)
1054 {
1055         /* Register notifier for inet6 address additions/deletions. */
1056         register_inet6addr_notifier(&sctp_inet6addr_notifier);
1057
1058         if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0)
1059                 return -EAGAIN;
1060
1061         return 0;
1062 }
1063
1064 /* Unregister with inet6 layer. */
1065 void sctp_v6_del_protocol(void)
1066 {
1067         inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP);
1068         unregister_inet6addr_notifier(&sctp_inet6addr_notifier);
1069 }