[SCTP]: Annotate ->inaddr_any().
[linux-2.6.git] / net / sctp / ipv6.c
1 /* SCTP kernel reference 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 reference Implementation
8  *
9  * SCTP over IPv6.
10  *
11  * The SCTP reference 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  * The SCTP reference 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 #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/sched.h>
57 #include <linux/in.h>
58 #include <linux/in6.h>
59 #include <linux/netdevice.h>
60 #include <linux/init.h>
61 #include <linux/ipsec.h>
62
63 #include <linux/ipv6.h>
64 #include <linux/icmpv6.h>
65 #include <linux/random.h>
66 #include <linux/seq_file.h>
67
68 #include <net/protocol.h>
69 #include <net/ndisc.h>
70 #include <net/ip.h>
71 #include <net/ipv6.h>
72 #include <net/transp_v6.h>
73 #include <net/addrconf.h>
74 #include <net/ip6_route.h>
75 #include <net/inet_common.h>
76 #include <net/inet_ecn.h>
77 #include <net/sctp/sctp.h>
78
79 #include <asm/uaccess.h>
80
81 static struct notifier_block sctp_inet6addr_notifier = {
82         .notifier_call = sctp_inetaddr_event,
83 };
84
85 /* ICMP error handler. */
86 SCTP_STATIC void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
87                              int type, int code, int offset, __be32 info)
88 {
89         struct inet6_dev *idev;
90         struct ipv6hdr *iph = (struct ipv6hdr *)skb->data;
91         struct sctphdr *sh = (struct sctphdr *)(skb->data + offset);
92         struct sock *sk;
93         struct sctp_association *asoc;
94         struct sctp_transport *transport;
95         struct ipv6_pinfo *np;
96         char *saveip, *savesctp;
97         int err;
98
99         idev = in6_dev_get(skb->dev);
100
101         /* Fix up skb to look at the embedded net header. */
102         saveip = skb->nh.raw;
103         savesctp  = skb->h.raw;
104         skb->nh.ipv6h = iph;
105         skb->h.raw = (char *)sh;
106         sk = sctp_err_lookup(AF_INET6, skb, sh, &asoc, &transport);
107         /* Put back, the original pointers. */
108         skb->nh.raw = saveip;
109         skb->h.raw = savesctp;
110         if (!sk) {
111                 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INERRORS);
112                 goto out;
113         }
114
115         /* Warning:  The sock lock is held.  Remember to call
116          * sctp_err_finish!
117          */
118
119         switch (type) {
120         case ICMPV6_PKT_TOOBIG:
121                 sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info));
122                 goto out_unlock;
123         case ICMPV6_PARAMPROB:
124                 if (ICMPV6_UNK_NEXTHDR == code) {
125                         sctp_icmp_proto_unreachable(sk, asoc, transport);
126                         goto out_unlock;
127                 }
128                 break;
129         default:
130                 break;
131         }
132
133         np = inet6_sk(sk);
134         icmpv6_err_convert(type, code, &err);
135         if (!sock_owned_by_user(sk) && np->recverr) {
136                 sk->sk_err = err;
137                 sk->sk_error_report(sk);
138         } else {  /* Only an error on timeout */
139                 sk->sk_err_soft = err;
140         }
141
142 out_unlock:
143         sctp_err_finish(sk, asoc);
144 out:
145         if (likely(idev != NULL))
146                 in6_dev_put(idev);
147 }
148
149 /* Based on tcp_v6_xmit() in tcp_ipv6.c. */
150 static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport,
151                         int ipfragok)
152 {
153         struct sock *sk = skb->sk;
154         struct ipv6_pinfo *np = inet6_sk(sk);
155         struct flowi fl;
156
157         memset(&fl, 0, sizeof(fl));
158
159         fl.proto = sk->sk_protocol;
160
161         /* Fill in the dest address from the route entry passed with the skb
162          * and the source address from the transport.
163          */
164         ipv6_addr_copy(&fl.fl6_dst, &transport->ipaddr.v6.sin6_addr);
165         ipv6_addr_copy(&fl.fl6_src, &transport->saddr.v6.sin6_addr);
166
167         fl.fl6_flowlabel = np->flow_label;
168         IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel);
169         if (ipv6_addr_type(&fl.fl6_src) & IPV6_ADDR_LINKLOCAL)
170                 fl.oif = transport->saddr.v6.sin6_scope_id;
171         else
172                 fl.oif = sk->sk_bound_dev_if;
173
174         if (np->opt && np->opt->srcrt) {
175                 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
176                 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
177         }
178
179         SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, "
180                           "src:" NIP6_FMT " dst:" NIP6_FMT "\n",
181                           __FUNCTION__, skb, skb->len,
182                           NIP6(fl.fl6_src), NIP6(fl.fl6_dst));
183
184         SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
185
186         return ip6_xmit(sk, skb, &fl, np->opt, ipfragok);
187 }
188
189 /* Returns the dst cache entry for the given source and destination ip
190  * addresses.
191  */
192 static struct dst_entry *sctp_v6_get_dst(struct sctp_association *asoc,
193                                          union sctp_addr *daddr,
194                                          union sctp_addr *saddr)
195 {
196         struct dst_entry *dst;
197         struct flowi fl;
198
199         memset(&fl, 0, sizeof(fl));
200         ipv6_addr_copy(&fl.fl6_dst, &daddr->v6.sin6_addr);
201         if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
202                 fl.oif = daddr->v6.sin6_scope_id;
203         
204
205         SCTP_DEBUG_PRINTK("%s: DST=" NIP6_FMT " ",
206                           __FUNCTION__, NIP6(fl.fl6_dst));
207
208         if (saddr) {
209                 ipv6_addr_copy(&fl.fl6_src, &saddr->v6.sin6_addr);
210                 SCTP_DEBUG_PRINTK(
211                         "SRC=" NIP6_FMT " - ",
212                         NIP6(fl.fl6_src));
213         }
214
215         dst = ip6_route_output(NULL, &fl);
216         if (!dst->error) {
217                 struct rt6_info *rt;
218                 rt = (struct rt6_info *)dst;
219                 SCTP_DEBUG_PRINTK(
220                         "rt6_dst:" NIP6_FMT " rt6_src:" NIP6_FMT "\n",
221                         NIP6(rt->rt6i_dst.addr), NIP6(rt->rt6i_src.addr));
222                 return dst;
223         }
224         SCTP_DEBUG_PRINTK("NO ROUTE\n");
225         dst_release(dst);
226         return NULL;
227 }
228
229 /* Returns the number of consecutive initial bits that match in the 2 ipv6
230  * addresses.
231  */
232 static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
233                                          union sctp_addr *s2)
234 {
235         struct in6_addr *a1 = &s1->v6.sin6_addr;
236         struct in6_addr *a2 = &s2->v6.sin6_addr;
237         int i, j;
238
239         for (i = 0; i < 4 ; i++) {
240                 __be32 a1xora2;
241
242                 a1xora2 = a1->s6_addr32[i] ^ a2->s6_addr32[i];
243
244                 if ((j = fls(ntohl(a1xora2))))
245                         return (i * 32 + 32 - j);
246         }
247
248         return (i*32);
249 }
250
251 /* Fills in the source address(saddr) based on the destination address(daddr)
252  * and asoc's bind address list.
253  */
254 static void sctp_v6_get_saddr(struct sctp_association *asoc,
255                               struct dst_entry *dst,
256                               union sctp_addr *daddr,
257                               union sctp_addr *saddr)
258 {
259         struct sctp_bind_addr *bp;
260         rwlock_t *addr_lock;
261         struct sctp_sockaddr_entry *laddr;
262         struct list_head *pos;
263         sctp_scope_t scope;
264         union sctp_addr *baddr = NULL;
265         __u8 matchlen = 0;
266         __u8 bmatchlen;
267
268         SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p "
269                           "daddr:" NIP6_FMT " ",
270                           __FUNCTION__, asoc, dst, NIP6(daddr->v6.sin6_addr));
271
272         if (!asoc) {
273                 ipv6_get_saddr(dst, &daddr->v6.sin6_addr,&saddr->v6.sin6_addr);
274                 SCTP_DEBUG_PRINTK("saddr from ipv6_get_saddr: " NIP6_FMT "\n",
275                                   NIP6(saddr->v6.sin6_addr));
276                 return;
277         }
278
279         scope = sctp_scope(daddr);
280
281         bp = &asoc->base.bind_addr;
282         addr_lock = &asoc->base.addr_lock;
283
284         /* Go through the bind address list and find the best source address
285          * that matches the scope of the destination address.
286          */
287         sctp_read_lock(addr_lock);
288         list_for_each(pos, &bp->address_list) {
289                 laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
290                 if ((laddr->use_as_src) &&
291                     (laddr->a.sa.sa_family == AF_INET6) &&
292                     (scope <= sctp_scope(&laddr->a))) {
293                         bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a);
294                         if (!baddr || (matchlen < bmatchlen)) {
295                                 baddr = &laddr->a;
296                                 matchlen = bmatchlen;
297                         }
298                 }
299         }
300
301         if (baddr) {
302                 memcpy(saddr, baddr, sizeof(union sctp_addr));
303                 SCTP_DEBUG_PRINTK("saddr: " NIP6_FMT "\n",
304                                   NIP6(saddr->v6.sin6_addr));
305         } else {
306                 printk(KERN_ERR "%s: asoc:%p Could not find a valid source "
307                        "address for the dest:" NIP6_FMT "\n",
308                        __FUNCTION__, asoc, NIP6(daddr->v6.sin6_addr));
309         }
310
311         sctp_read_unlock(addr_lock);
312 }
313
314 /* Make a copy of all potential local addresses. */
315 static void sctp_v6_copy_addrlist(struct list_head *addrlist,
316                                   struct net_device *dev)
317 {
318         struct inet6_dev *in6_dev;
319         struct inet6_ifaddr *ifp;
320         struct sctp_sockaddr_entry *addr;
321
322         rcu_read_lock();
323         if ((in6_dev = __in6_dev_get(dev)) == NULL) {
324                 rcu_read_unlock();
325                 return;
326         }
327
328         read_lock(&in6_dev->lock);
329         for (ifp = in6_dev->addr_list; ifp; ifp = ifp->if_next) {
330                 /* Add the address to the local list.  */
331                 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
332                 if (addr) {
333                         addr->a.v6.sin6_family = AF_INET6;
334                         addr->a.v6.sin6_port = 0;
335                         addr->a.v6.sin6_addr = ifp->addr;
336                         addr->a.v6.sin6_scope_id = dev->ifindex;
337                         INIT_LIST_HEAD(&addr->list);
338                         list_add_tail(&addr->list, addrlist);
339                 }
340         }
341
342         read_unlock(&in6_dev->lock);
343         rcu_read_unlock();
344 }
345
346 /* Initialize a sockaddr_storage from in incoming skb. */
347 static void sctp_v6_from_skb(union sctp_addr *addr,struct sk_buff *skb,
348                              int is_saddr)
349 {
350         void *from;
351         __be16 *port;
352         struct sctphdr *sh;
353
354         port = &addr->v6.sin6_port;
355         addr->v6.sin6_family = AF_INET6;
356         addr->v6.sin6_flowinfo = 0; /* FIXME */
357         addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif;
358
359         sh = (struct sctphdr *) skb->h.raw;
360         if (is_saddr) {
361                 *port  = sh->source;
362                 from = &skb->nh.ipv6h->saddr;
363         } else {
364                 *port = sh->dest;
365                 from = &skb->nh.ipv6h->daddr;
366         }
367         ipv6_addr_copy(&addr->v6.sin6_addr, from);
368 }
369
370 /* Initialize an sctp_addr from a socket. */
371 static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk)
372 {
373         addr->v6.sin6_family = AF_INET6;
374         addr->v6.sin6_port = 0;
375         addr->v6.sin6_addr = inet6_sk(sk)->rcv_saddr;
376 }
377
378 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
379 static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
380 {
381         if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
382                 inet6_sk(sk)->rcv_saddr.s6_addr32[0] = 0;
383                 inet6_sk(sk)->rcv_saddr.s6_addr32[1] = 0;
384                 inet6_sk(sk)->rcv_saddr.s6_addr32[2] = htonl(0x0000ffff);
385                 inet6_sk(sk)->rcv_saddr.s6_addr32[3] =
386                         addr->v4.sin_addr.s_addr;
387         } else {
388                 inet6_sk(sk)->rcv_saddr = addr->v6.sin6_addr;
389         }
390 }
391
392 /* Initialize sk->sk_daddr from sctp_addr. */
393 static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
394 {
395         if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
396                 inet6_sk(sk)->daddr.s6_addr32[0] = 0;
397                 inet6_sk(sk)->daddr.s6_addr32[1] = 0;
398                 inet6_sk(sk)->daddr.s6_addr32[2] = htonl(0x0000ffff);
399                 inet6_sk(sk)->daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
400         } else {
401                 inet6_sk(sk)->daddr = addr->v6.sin6_addr;
402         }
403 }
404
405 /* Initialize a sctp_addr from an address parameter. */
406 static void sctp_v6_from_addr_param(union sctp_addr *addr,
407                                     union sctp_addr_param *param,
408                                     __be16 port, int iif)
409 {
410         addr->v6.sin6_family = AF_INET6;
411         addr->v6.sin6_port = port;
412         addr->v6.sin6_flowinfo = 0; /* BUG */
413         ipv6_addr_copy(&addr->v6.sin6_addr, &param->v6.addr);
414         addr->v6.sin6_scope_id = iif;
415 }
416
417 /* Initialize an address parameter from a sctp_addr and return the length
418  * of the address parameter.
419  */
420 static int sctp_v6_to_addr_param(const union sctp_addr *addr,
421                                  union sctp_addr_param *param)
422 {
423         int length = sizeof(sctp_ipv6addr_param_t);
424
425         param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS;
426         param->v6.param_hdr.length = htons(length);
427         ipv6_addr_copy(&param->v6.addr, &addr->v6.sin6_addr);
428
429         return length;
430 }
431
432 /* Initialize a sctp_addr from a dst_entry. */
433 static void sctp_v6_dst_saddr(union sctp_addr *addr, struct dst_entry *dst,
434                               __be16 port)
435 {
436         struct rt6_info *rt = (struct rt6_info *)dst;
437         addr->sa.sa_family = AF_INET6;
438         addr->v6.sin6_port = port;
439         ipv6_addr_copy(&addr->v6.sin6_addr, &rt->rt6i_src.addr);
440 }
441
442 /* Compare addresses exactly.
443  * v4-mapped-v6 is also in consideration.
444  */
445 static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
446                             const union sctp_addr *addr2)
447 {
448         if (addr1->sa.sa_family != addr2->sa.sa_family) {
449                 if (addr1->sa.sa_family == AF_INET &&
450                     addr2->sa.sa_family == AF_INET6 &&
451                     IPV6_ADDR_MAPPED == ipv6_addr_type(&addr2->v6.sin6_addr)) {
452                         if (addr2->v6.sin6_port == addr1->v4.sin_port &&
453                             addr2->v6.sin6_addr.s6_addr32[3] ==
454                             addr1->v4.sin_addr.s_addr)
455                                 return 1;
456                 }
457                 if (addr2->sa.sa_family == AF_INET &&
458                     addr1->sa.sa_family == AF_INET6 &&
459                     IPV6_ADDR_MAPPED == ipv6_addr_type(&addr1->v6.sin6_addr)) {
460                         if (addr1->v6.sin6_port == addr2->v4.sin_port &&
461                             addr1->v6.sin6_addr.s6_addr32[3] ==
462                             addr2->v4.sin_addr.s_addr)
463                                 return 1;
464                 }
465                 return 0;
466         }
467         if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr))
468                 return 0;
469         /* If this is a linklocal address, compare the scope_id. */
470         if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) {
471                 if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id &&
472                     (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) {
473                         return 0;
474                 }
475         }
476
477         return 1;
478 }
479
480 /* Initialize addr struct to INADDR_ANY. */
481 static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port)
482 {
483         memset(addr, 0x00, sizeof(union sctp_addr));
484         addr->v6.sin6_family = AF_INET6;
485         addr->v6.sin6_port = port;
486 }
487
488 /* Is this a wildcard address? */
489 static int sctp_v6_is_any(const union sctp_addr *addr)
490 {
491         return ipv6_addr_any(&addr->v6.sin6_addr);
492 }
493
494 /* Should this be available for binding?   */
495 static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp)
496 {
497         int type;
498         struct in6_addr *in6 = (struct in6_addr *)&addr->v6.sin6_addr;
499
500         type = ipv6_addr_type(in6);
501         if (IPV6_ADDR_ANY == type)
502                 return 1;
503         if (type == IPV6_ADDR_MAPPED) {
504                 if (sp && !sp->v4mapped)
505                         return 0;
506                 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
507                         return 0;
508                 sctp_v6_map_v4(addr);
509                 return sctp_get_af_specific(AF_INET)->available(addr, sp);
510         }
511         if (!(type & IPV6_ADDR_UNICAST))
512                 return 0;
513
514         return ipv6_chk_addr(in6, NULL, 0);
515 }
516
517 /* This function checks if the address is a valid address to be used for
518  * SCTP.
519  *
520  * Output:
521  * Return 0 - If the address is a non-unicast or an illegal address.
522  * Return 1 - If the address is a unicast.
523  */
524 static int sctp_v6_addr_valid(union sctp_addr *addr,
525                               struct sctp_sock *sp,
526                               const struct sk_buff *skb)
527 {
528         int ret = ipv6_addr_type(&addr->v6.sin6_addr);
529
530         /* Support v4-mapped-v6 address. */
531         if (ret == IPV6_ADDR_MAPPED) {
532                 /* Note: This routine is used in input, so v4-mapped-v6
533                  * are disallowed here when there is no sctp_sock.
534                  */
535                 if (!sp || !sp->v4mapped)
536                         return 0;
537                 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
538                         return 0;
539                 sctp_v6_map_v4(addr);
540                 return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb);
541         }
542
543         /* Is this a non-unicast address */
544         if (!(ret & IPV6_ADDR_UNICAST))
545                 return 0;
546
547         return 1;
548 }
549
550 /* What is the scope of 'addr'?  */
551 static sctp_scope_t sctp_v6_scope(union sctp_addr *addr)
552 {
553         int v6scope;
554         sctp_scope_t retval;
555
556         /* The IPv6 scope is really a set of bit fields.
557          * See IFA_* in <net/if_inet6.h>.  Map to a generic SCTP scope.
558          */
559
560         v6scope = ipv6_addr_scope(&addr->v6.sin6_addr);
561         switch (v6scope) {
562         case IFA_HOST:
563                 retval = SCTP_SCOPE_LOOPBACK;
564                 break;
565         case IFA_LINK:
566                 retval = SCTP_SCOPE_LINK;
567                 break;
568         case IFA_SITE:
569                 retval = SCTP_SCOPE_PRIVATE;
570                 break;
571         default:
572                 retval = SCTP_SCOPE_GLOBAL;
573                 break;
574         };
575
576         return retval;
577 }
578
579 /* Create and initialize a new sk for the socket to be returned by accept(). */
580 static struct sock *sctp_v6_create_accept_sk(struct sock *sk,
581                                              struct sctp_association *asoc)
582 {
583         struct inet_sock *inet = inet_sk(sk);
584         struct sock *newsk;
585         struct inet_sock *newinet;
586         struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
587         struct sctp6_sock *newsctp6sk;
588
589         newsk = sk_alloc(PF_INET6, GFP_KERNEL, sk->sk_prot, 1);
590         if (!newsk)
591                 goto out;
592
593         sock_init_data(NULL, newsk);
594
595         newsk->sk_type = SOCK_STREAM;
596
597         newsk->sk_prot = sk->sk_prot;
598         newsk->sk_no_check = sk->sk_no_check;
599         newsk->sk_reuse = sk->sk_reuse;
600
601         newsk->sk_destruct = inet_sock_destruct;
602         newsk->sk_family = PF_INET6;
603         newsk->sk_protocol = IPPROTO_SCTP;
604         newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
605         newsk->sk_shutdown = sk->sk_shutdown;
606         sock_reset_flag(sk, SOCK_ZAPPED);
607
608         newsctp6sk = (struct sctp6_sock *)newsk;
609         inet_sk(newsk)->pinet6 = &newsctp6sk->inet6;
610
611         newinet = inet_sk(newsk);
612         newnp = inet6_sk(newsk);
613
614         memcpy(newnp, np, sizeof(struct ipv6_pinfo));
615
616         /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
617          * and getpeername().
618          */
619         newinet->sport = inet->sport;
620         newnp->saddr = np->saddr;
621         newnp->rcv_saddr = np->rcv_saddr;
622         newinet->dport = htons(asoc->peer.port);
623         sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);
624
625         /* Init the ipv4 part of the socket since we can have sockets
626          * using v6 API for ipv4.
627          */
628         newinet->uc_ttl = -1;
629         newinet->mc_loop = 1;
630         newinet->mc_ttl = 1;
631         newinet->mc_index = 0;
632         newinet->mc_list = NULL;
633
634         if (ipv4_config.no_pmtu_disc)
635                 newinet->pmtudisc = IP_PMTUDISC_DONT;
636         else
637                 newinet->pmtudisc = IP_PMTUDISC_WANT;
638
639         sk_refcnt_debug_inc(newsk);
640
641         if (newsk->sk_prot->init(newsk)) {
642                 sk_common_release(newsk);
643                 newsk = NULL;
644         }
645
646 out:
647         return newsk;
648 }
649
650 /* Map v4 address to mapped v6 address */
651 static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
652 {
653         if (sp->v4mapped && AF_INET == addr->sa.sa_family)
654                 sctp_v4_map_v6(addr);
655 }
656
657 /* Where did this skb come from?  */
658 static int sctp_v6_skb_iif(const struct sk_buff *skb)
659 {
660         struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
661         return opt->iif;
662 }
663
664 /* Was this packet marked by Explicit Congestion Notification? */
665 static int sctp_v6_is_ce(const struct sk_buff *skb)
666 {
667         return *((__u32 *)(skb->nh.ipv6h)) & htonl(1<<20);
668 }
669
670 /* Dump the v6 addr to the seq file. */
671 static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
672 {
673         seq_printf(seq, NIP6_FMT " ", NIP6(addr->v6.sin6_addr));
674 }
675
676 /* Initialize a PF_INET6 socket msg_name. */
677 static void sctp_inet6_msgname(char *msgname, int *addr_len)
678 {
679         struct sockaddr_in6 *sin6;
680
681         sin6 = (struct sockaddr_in6 *)msgname;
682         sin6->sin6_family = AF_INET6;
683         sin6->sin6_flowinfo = 0;
684         sin6->sin6_scope_id = 0; /*FIXME */
685         *addr_len = sizeof(struct sockaddr_in6);
686 }
687
688 /* Initialize a PF_INET msgname from a ulpevent. */
689 static void sctp_inet6_event_msgname(struct sctp_ulpevent *event,
690                                      char *msgname, int *addrlen)
691 {
692         struct sockaddr_in6 *sin6, *sin6from;
693
694         if (msgname) {
695                 union sctp_addr *addr;
696                 struct sctp_association *asoc;
697
698                 asoc = event->asoc;
699                 sctp_inet6_msgname(msgname, addrlen);
700                 sin6 = (struct sockaddr_in6 *)msgname;
701                 sin6->sin6_port = htons(asoc->peer.port);
702                 addr = &asoc->peer.primary_addr;
703
704                 /* Note: If we go to a common v6 format, this code
705                  * will change.
706                  */
707
708                 /* Map ipv4 address into v4-mapped-on-v6 address.  */
709                 if (sctp_sk(asoc->base.sk)->v4mapped &&
710                     AF_INET == addr->sa.sa_family) {
711                         sctp_v4_map_v6((union sctp_addr *)sin6);
712                         sin6->sin6_addr.s6_addr32[3] =
713                                 addr->v4.sin_addr.s_addr;
714                         return;
715                 }
716
717                 sin6from = &asoc->peer.primary_addr.v6;
718                 ipv6_addr_copy(&sin6->sin6_addr, &sin6from->sin6_addr);
719                 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
720                         sin6->sin6_scope_id = sin6from->sin6_scope_id;
721         }
722 }
723
724 /* Initialize a msg_name from an inbound skb. */
725 static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname,
726                                    int *addr_len)
727 {
728         struct sctphdr *sh;
729         struct sockaddr_in6 *sin6;
730
731         if (msgname) {
732                 sctp_inet6_msgname(msgname, addr_len);
733                 sin6 = (struct sockaddr_in6 *)msgname;
734                 sh = (struct sctphdr *)skb->h.raw;
735                 sin6->sin6_port = sh->source;
736
737                 /* Map ipv4 address into v4-mapped-on-v6 address. */
738                 if (sctp_sk(skb->sk)->v4mapped &&
739                     skb->nh.iph->version == 4) {
740                         sctp_v4_map_v6((union sctp_addr *)sin6);
741                         sin6->sin6_addr.s6_addr32[3] = skb->nh.iph->saddr;
742                         return;
743                 }
744
745                 /* Otherwise, just copy the v6 address. */
746                 ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr);
747                 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) {
748                         struct sctp_ulpevent *ev = sctp_skb2event(skb);
749                         sin6->sin6_scope_id = ev->iif;
750                 }
751         }
752 }
753
754 /* Do we support this AF? */
755 static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp)
756 {
757         switch (family) {
758         case AF_INET6:
759                 return 1;
760         /* v4-mapped-v6 addresses */
761         case AF_INET:
762                 if (!__ipv6_only_sock(sctp_opt2sk(sp)) && sp->v4mapped)
763                         return 1;
764         default:
765                 return 0;
766         }
767 }
768
769 /* Address matching with wildcards allowed.  This extra level
770  * of indirection lets us choose whether a PF_INET6 should
771  * disallow any v4 addresses if we so choose.
772  */
773 static int sctp_inet6_cmp_addr(const union sctp_addr *addr1,
774                                const union sctp_addr *addr2,
775                                struct sctp_sock *opt)
776 {
777         struct sctp_af *af1, *af2;
778
779         af1 = sctp_get_af_specific(addr1->sa.sa_family);
780         af2 = sctp_get_af_specific(addr2->sa.sa_family);
781
782         if (!af1 || !af2)
783                 return 0;
784         /* Today, wildcard AF_INET/AF_INET6. */
785         if (sctp_is_any(addr1) || sctp_is_any(addr2))
786                 return 1;
787
788         if (addr1->sa.sa_family != addr2->sa.sa_family)
789                 return 0;
790
791         return af1->cmp_addr(addr1, addr2);
792 }
793
794 /* Verify that the provided sockaddr looks bindable.   Common verification,
795  * has already been taken care of.
796  */
797 static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
798 {
799         struct sctp_af *af;
800
801         /* ASSERT: address family has already been verified. */
802         if (addr->sa.sa_family != AF_INET6)
803                 af = sctp_get_af_specific(addr->sa.sa_family);
804         else {
805                 int type = ipv6_addr_type(&addr->v6.sin6_addr);
806                 struct net_device *dev;
807
808                 if (type & IPV6_ADDR_LINKLOCAL) {
809                         if (!addr->v6.sin6_scope_id)
810                                 return 0;
811                         dev = dev_get_by_index(addr->v6.sin6_scope_id);
812                         if (!dev)
813                                 return 0;
814                         dev_put(dev);
815                 }
816                 af = opt->pf->af;
817         }
818         return af->available(addr, opt);
819 }
820
821 /* Verify that the provided sockaddr looks sendable.   Common verification,
822  * has already been taken care of.
823  */
824 static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
825 {
826         struct sctp_af *af = NULL;
827
828         /* ASSERT: address family has already been verified. */
829         if (addr->sa.sa_family != AF_INET6)
830                 af = sctp_get_af_specific(addr->sa.sa_family);
831         else {
832                 int type = ipv6_addr_type(&addr->v6.sin6_addr);
833                 struct net_device *dev;
834
835                 if (type & IPV6_ADDR_LINKLOCAL) {
836                         if (!addr->v6.sin6_scope_id)
837                                 return 0;
838                         dev = dev_get_by_index(addr->v6.sin6_scope_id);
839                         if (!dev)
840                                 return 0;
841                         dev_put(dev);
842                 }
843                 af = opt->pf->af;
844         }
845
846         return af != NULL;
847 }
848
849 /* Fill in Supported Address Type information for INIT and INIT-ACK
850  * chunks.   Note: In the future, we may want to look at sock options
851  * to determine whether a PF_INET6 socket really wants to have IPV4
852  * addresses.
853  * Returns number of addresses supported.
854  */
855 static int sctp_inet6_supported_addrs(const struct sctp_sock *opt,
856                                       __u16 *types)
857 {
858         types[0] = SCTP_PARAM_IPV4_ADDRESS;
859         types[1] = SCTP_PARAM_IPV6_ADDRESS;
860         return 2;
861 }
862
863 static const struct proto_ops inet6_seqpacket_ops = {
864         .family            = PF_INET6,
865         .owner             = THIS_MODULE,
866         .release           = inet6_release,
867         .bind              = inet6_bind,
868         .connect           = inet_dgram_connect,
869         .socketpair        = sock_no_socketpair,
870         .accept            = inet_accept,
871         .getname           = inet6_getname,
872         .poll              = sctp_poll,
873         .ioctl             = inet6_ioctl,
874         .listen            = sctp_inet_listen,
875         .shutdown          = inet_shutdown,
876         .setsockopt        = sock_common_setsockopt,
877         .getsockopt        = sock_common_getsockopt,
878         .sendmsg           = inet_sendmsg,
879         .recvmsg           = sock_common_recvmsg,
880         .mmap              = sock_no_mmap,
881 #ifdef CONFIG_COMPAT
882         .compat_setsockopt = compat_sock_common_setsockopt,
883         .compat_getsockopt = compat_sock_common_getsockopt,
884 #endif
885 };
886
887 static struct inet_protosw sctpv6_seqpacket_protosw = {
888         .type          = SOCK_SEQPACKET,
889         .protocol      = IPPROTO_SCTP,
890         .prot          = &sctpv6_prot,
891         .ops           = &inet6_seqpacket_ops,
892         .capability    = -1,
893         .no_check      = 0,
894         .flags         = SCTP_PROTOSW_FLAG
895 };
896 static struct inet_protosw sctpv6_stream_protosw = {
897         .type          = SOCK_STREAM,
898         .protocol      = IPPROTO_SCTP,
899         .prot          = &sctpv6_prot,
900         .ops           = &inet6_seqpacket_ops,
901         .capability    = -1,
902         .no_check      = 0,
903         .flags         = SCTP_PROTOSW_FLAG,
904 };
905
906 static int sctp6_rcv(struct sk_buff **pskb)
907 {
908         return sctp_rcv(*pskb) ? -1 : 0;
909 }
910
911 static struct inet6_protocol sctpv6_protocol = {
912         .handler      = sctp6_rcv,
913         .err_handler  = sctp_v6_err,
914         .flags        = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
915 };
916
917 static struct sctp_af sctp_ipv6_specific = {
918         .sa_family         = AF_INET6,
919         .sctp_xmit         = sctp_v6_xmit,
920         .setsockopt        = ipv6_setsockopt,
921         .getsockopt        = ipv6_getsockopt,
922         .get_dst           = sctp_v6_get_dst,
923         .get_saddr         = sctp_v6_get_saddr,
924         .copy_addrlist     = sctp_v6_copy_addrlist,
925         .from_skb          = sctp_v6_from_skb,
926         .from_sk           = sctp_v6_from_sk,
927         .to_sk_saddr       = sctp_v6_to_sk_saddr,
928         .to_sk_daddr       = sctp_v6_to_sk_daddr,
929         .from_addr_param   = sctp_v6_from_addr_param,
930         .to_addr_param     = sctp_v6_to_addr_param,
931         .dst_saddr         = sctp_v6_dst_saddr,
932         .cmp_addr          = sctp_v6_cmp_addr,
933         .scope             = sctp_v6_scope,
934         .addr_valid        = sctp_v6_addr_valid,
935         .inaddr_any        = sctp_v6_inaddr_any,
936         .is_any            = sctp_v6_is_any,
937         .available         = sctp_v6_available,
938         .skb_iif           = sctp_v6_skb_iif,
939         .is_ce             = sctp_v6_is_ce,
940         .seq_dump_addr     = sctp_v6_seq_dump_addr,
941         .net_header_len    = sizeof(struct ipv6hdr),
942         .sockaddr_len      = sizeof(struct sockaddr_in6),
943 #ifdef CONFIG_COMPAT
944         .compat_setsockopt = compat_ipv6_setsockopt,
945         .compat_getsockopt = compat_ipv6_getsockopt,
946 #endif
947 };
948
949 static struct sctp_pf sctp_pf_inet6_specific = {
950         .event_msgname = sctp_inet6_event_msgname,
951         .skb_msgname   = sctp_inet6_skb_msgname,
952         .af_supported  = sctp_inet6_af_supported,
953         .cmp_addr      = sctp_inet6_cmp_addr,
954         .bind_verify   = sctp_inet6_bind_verify,
955         .send_verify   = sctp_inet6_send_verify,
956         .supported_addrs = sctp_inet6_supported_addrs,
957         .create_accept_sk = sctp_v6_create_accept_sk,
958         .addr_v4map    = sctp_v6_addr_v4map,
959         .af            = &sctp_ipv6_specific,
960 };
961
962 /* Initialize IPv6 support and register with inet6 stack.  */
963 int sctp_v6_init(void)
964 {
965         int rc = proto_register(&sctpv6_prot, 1);
966
967         if (rc)
968                 goto out;
969         /* Register inet6 protocol. */
970         rc = -EAGAIN;
971         if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0)
972                 goto out_unregister_sctp_proto;
973
974         /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
975         inet6_register_protosw(&sctpv6_seqpacket_protosw);
976         inet6_register_protosw(&sctpv6_stream_protosw);
977
978         /* Register the SCTP specific PF_INET6 functions. */
979         sctp_register_pf(&sctp_pf_inet6_specific, PF_INET6);
980
981         /* Register the SCTP specific AF_INET6 functions. */
982         sctp_register_af(&sctp_ipv6_specific);
983
984         /* Register notifier for inet6 address additions/deletions. */
985         register_inet6addr_notifier(&sctp_inet6addr_notifier);
986         rc = 0;
987 out:
988         return rc;
989 out_unregister_sctp_proto:
990         proto_unregister(&sctpv6_prot);
991         goto out;
992 }
993
994 /* IPv6 specific exit support. */
995 void sctp_v6_exit(void)
996 {
997         list_del(&sctp_ipv6_specific.list);
998         inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP);
999         inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
1000         inet6_unregister_protosw(&sctpv6_stream_protosw);
1001         unregister_inet6addr_notifier(&sctp_inet6addr_notifier);
1002         proto_unregister(&sctpv6_prot);
1003 }