Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/sparc-2.6
[linux-2.6] / net / ipv6 / af_inet6.c
1 /*
2  *      PF_INET6 socket protocol family
3  *      Linux INET6 implementation
4  *
5  *      Authors:
6  *      Pedro Roque             <roque@di.fc.ul.pt>
7  *
8  *      Adapted from linux/net/ipv4/af_inet.c
9  *
10  *      $Id: af_inet6.c,v 1.66 2002/02/01 22:01:04 davem Exp $
11  *
12  *      Fixes:
13  *      piggy, Karl Knutson     :       Socket protocol table
14  *      Hideaki YOSHIFUJI       :       sin6_scope_id support
15  *      Arnaldo Melo            :       check proc_net_create return, cleanups
16  *
17  *      This program is free software; you can redistribute it and/or
18  *      modify it under the terms of the GNU General Public License
19  *      as published by the Free Software Foundation; either version
20  *      2 of the License, or (at your option) any later version.
21  */
22
23
24 #include <linux/module.h>
25 #include <linux/capability.h>
26 #include <linux/errno.h>
27 #include <linux/types.h>
28 #include <linux/socket.h>
29 #include <linux/in.h>
30 #include <linux/kernel.h>
31 #include <linux/timer.h>
32 #include <linux/string.h>
33 #include <linux/sockios.h>
34 #include <linux/net.h>
35 #include <linux/fcntl.h>
36 #include <linux/mm.h>
37 #include <linux/interrupt.h>
38 #include <linux/proc_fs.h>
39 #include <linux/stat.h>
40 #include <linux/init.h>
41
42 #include <linux/inet.h>
43 #include <linux/netdevice.h>
44 #include <linux/icmpv6.h>
45 #include <linux/netfilter_ipv6.h>
46
47 #include <net/ip.h>
48 #include <net/ipv6.h>
49 #include <net/udp.h>
50 #include <net/udplite.h>
51 #include <net/tcp.h>
52 #include <net/ipip.h>
53 #include <net/protocol.h>
54 #include <net/inet_common.h>
55 #include <net/transp_v6.h>
56 #include <net/ip6_route.h>
57 #include <net/addrconf.h>
58 #ifdef CONFIG_IPV6_TUNNEL
59 #include <net/ip6_tunnel.h>
60 #endif
61
62 #include <asm/uaccess.h>
63 #include <asm/system.h>
64
65 MODULE_AUTHOR("Cast of dozens");
66 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
67 MODULE_LICENSE("GPL");
68
69 int sysctl_ipv6_bindv6only __read_mostly;
70
71 /* The inetsw table contains everything that inet_create needs to
72  * build a new socket.
73  */
74 static struct list_head inetsw6[SOCK_MAX];
75 static DEFINE_SPINLOCK(inetsw6_lock);
76
77 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
78 {
79         const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
80
81         return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
82 }
83
84 static int inet6_create(struct socket *sock, int protocol)
85 {
86         struct inet_sock *inet;
87         struct ipv6_pinfo *np;
88         struct sock *sk;
89         struct list_head *p;
90         struct inet_protosw *answer;
91         struct proto *answer_prot;
92         unsigned char answer_flags;
93         char answer_no_check;
94         int try_loading_module = 0;
95         int err;
96
97         if (sock->type != SOCK_RAW &&
98             sock->type != SOCK_DGRAM &&
99             !inet_ehash_secret)
100                 build_ehash_secret();
101
102         /* Look for the requested type/protocol pair. */
103         answer = NULL;
104 lookup_protocol:
105         err = -ESOCKTNOSUPPORT;
106         rcu_read_lock();
107         list_for_each_rcu(p, &inetsw6[sock->type]) {
108                 answer = list_entry(p, struct inet_protosw, list);
109
110                 /* Check the non-wild match. */
111                 if (protocol == answer->protocol) {
112                         if (protocol != IPPROTO_IP)
113                                 break;
114                 } else {
115                         /* Check for the two wild cases. */
116                         if (IPPROTO_IP == protocol) {
117                                 protocol = answer->protocol;
118                                 break;
119                         }
120                         if (IPPROTO_IP == answer->protocol)
121                                 break;
122                 }
123                 err = -EPROTONOSUPPORT;
124                 answer = NULL;
125         }
126
127         if (!answer) {
128                 if (try_loading_module < 2) {
129                         rcu_read_unlock();
130                         /*
131                          * Be more specific, e.g. net-pf-10-proto-132-type-1
132                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
133                          */
134                         if (++try_loading_module == 1)
135                                 request_module("net-pf-%d-proto-%d-type-%d",
136                                                 PF_INET6, protocol, sock->type);
137                         /*
138                          * Fall back to generic, e.g. net-pf-10-proto-132
139                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
140                          */
141                         else
142                                 request_module("net-pf-%d-proto-%d",
143                                                 PF_INET6, protocol);
144                         goto lookup_protocol;
145                 } else
146                         goto out_rcu_unlock;
147         }
148
149         err = -EPERM;
150         if (answer->capability > 0 && !capable(answer->capability))
151                 goto out_rcu_unlock;
152
153         sock->ops = answer->ops;
154         answer_prot = answer->prot;
155         answer_no_check = answer->no_check;
156         answer_flags = answer->flags;
157         rcu_read_unlock();
158
159         BUG_TRAP(answer_prot->slab != NULL);
160
161         err = -ENOBUFS;
162         sk = sk_alloc(PF_INET6, GFP_KERNEL, answer_prot, 1);
163         if (sk == NULL)
164                 goto out;
165
166         sock_init_data(sock, sk);
167
168         err = 0;
169         sk->sk_no_check = answer_no_check;
170         if (INET_PROTOSW_REUSE & answer_flags)
171                 sk->sk_reuse = 1;
172
173         inet = inet_sk(sk);
174         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
175
176         if (SOCK_RAW == sock->type) {
177                 inet->num = protocol;
178                 if (IPPROTO_RAW == protocol)
179                         inet->hdrincl = 1;
180         }
181
182         sk->sk_destruct         = inet_sock_destruct;
183         sk->sk_family           = PF_INET6;
184         sk->sk_protocol         = protocol;
185
186         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
187
188         inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
189         np->hop_limit   = -1;
190         np->mcast_hops  = -1;
191         np->mc_loop     = 1;
192         np->pmtudisc    = IPV6_PMTUDISC_WANT;
193         np->ipv6only    = sysctl_ipv6_bindv6only;
194
195         /* Init the ipv4 part of the socket since we can have sockets
196          * using v6 API for ipv4.
197          */
198         inet->uc_ttl    = -1;
199
200         inet->mc_loop   = 1;
201         inet->mc_ttl    = 1;
202         inet->mc_index  = 0;
203         inet->mc_list   = NULL;
204
205         if (ipv4_config.no_pmtu_disc)
206                 inet->pmtudisc = IP_PMTUDISC_DONT;
207         else
208                 inet->pmtudisc = IP_PMTUDISC_WANT;
209         /*
210          * Increment only the relevant sk_prot->socks debug field, this changes
211          * the previous behaviour of incrementing both the equivalent to
212          * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
213          *
214          * This allows better debug granularity as we'll know exactly how many
215          * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
216          * transport protocol socks. -acme
217          */
218         sk_refcnt_debug_inc(sk);
219
220         if (inet->num) {
221                 /* It assumes that any protocol which allows
222                  * the user to assign a number at socket
223                  * creation time automatically shares.
224                  */
225                 inet->sport = htons(inet->num);
226                 sk->sk_prot->hash(sk);
227         }
228         if (sk->sk_prot->init) {
229                 err = sk->sk_prot->init(sk);
230                 if (err) {
231                         sk_common_release(sk);
232                         goto out;
233                 }
234         }
235 out:
236         return err;
237 out_rcu_unlock:
238         rcu_read_unlock();
239         goto out;
240 }
241
242
243 /* bind for INET6 API */
244 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
245 {
246         struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
247         struct sock *sk = sock->sk;
248         struct inet_sock *inet = inet_sk(sk);
249         struct ipv6_pinfo *np = inet6_sk(sk);
250         __be32 v4addr = 0;
251         unsigned short snum;
252         int addr_type = 0;
253         int err = 0;
254
255         /* If the socket has its own bind function then use it. */
256         if (sk->sk_prot->bind)
257                 return sk->sk_prot->bind(sk, uaddr, addr_len);
258
259         if (addr_len < SIN6_LEN_RFC2133)
260                 return -EINVAL;
261         addr_type = ipv6_addr_type(&addr->sin6_addr);
262         if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
263                 return -EINVAL;
264
265         snum = ntohs(addr->sin6_port);
266         if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
267                 return -EACCES;
268
269         lock_sock(sk);
270
271         /* Check these errors (active socket, double bind). */
272         if (sk->sk_state != TCP_CLOSE || inet->num) {
273                 err = -EINVAL;
274                 goto out;
275         }
276
277         /* Check if the address belongs to the host. */
278         if (addr_type == IPV6_ADDR_MAPPED) {
279                 v4addr = addr->sin6_addr.s6_addr32[3];
280                 if (inet_addr_type(v4addr) != RTN_LOCAL) {
281                         err = -EADDRNOTAVAIL;
282                         goto out;
283                 }
284         } else {
285                 if (addr_type != IPV6_ADDR_ANY) {
286                         struct net_device *dev = NULL;
287
288                         if (addr_type & IPV6_ADDR_LINKLOCAL) {
289                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
290                                     addr->sin6_scope_id) {
291                                         /* Override any existing binding, if another one
292                                          * is supplied by user.
293                                          */
294                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
295                                 }
296
297                                 /* Binding to link-local address requires an interface */
298                                 if (!sk->sk_bound_dev_if) {
299                                         err = -EINVAL;
300                                         goto out;
301                                 }
302                                 dev = dev_get_by_index(sk->sk_bound_dev_if);
303                                 if (!dev) {
304                                         err = -ENODEV;
305                                         goto out;
306                                 }
307                         }
308
309                         /* ipv4 addr of the socket is invalid.  Only the
310                          * unspecified and mapped address have a v4 equivalent.
311                          */
312                         v4addr = LOOPBACK4_IPV6;
313                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
314                                 if (!ipv6_chk_addr(&addr->sin6_addr, dev, 0)) {
315                                         if (dev)
316                                                 dev_put(dev);
317                                         err = -EADDRNOTAVAIL;
318                                         goto out;
319                                 }
320                         }
321                         if (dev)
322                                 dev_put(dev);
323                 }
324         }
325
326         inet->rcv_saddr = v4addr;
327         inet->saddr = v4addr;
328
329         ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
330
331         if (!(addr_type & IPV6_ADDR_MULTICAST))
332                 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
333
334         /* Make sure we are allowed to bind here. */
335         if (sk->sk_prot->get_port(sk, snum)) {
336                 inet_reset_saddr(sk);
337                 err = -EADDRINUSE;
338                 goto out;
339         }
340
341         if (addr_type != IPV6_ADDR_ANY)
342                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
343         if (snum)
344                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
345         inet->sport = htons(inet->num);
346         inet->dport = 0;
347         inet->daddr = 0;
348 out:
349         release_sock(sk);
350         return err;
351 }
352
353 EXPORT_SYMBOL(inet6_bind);
354
355 int inet6_release(struct socket *sock)
356 {
357         struct sock *sk = sock->sk;
358
359         if (sk == NULL)
360                 return -EINVAL;
361
362         /* Free mc lists */
363         ipv6_sock_mc_close(sk);
364
365         /* Free ac lists */
366         ipv6_sock_ac_close(sk);
367
368         return inet_release(sock);
369 }
370
371 EXPORT_SYMBOL(inet6_release);
372
373 int inet6_destroy_sock(struct sock *sk)
374 {
375         struct ipv6_pinfo *np = inet6_sk(sk);
376         struct sk_buff *skb;
377         struct ipv6_txoptions *opt;
378
379         /* Release rx options */
380
381         if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
382                 kfree_skb(skb);
383
384         /* Free flowlabels */
385         fl6_free_socklist(sk);
386
387         /* Free tx options */
388
389         if ((opt = xchg(&np->opt, NULL)) != NULL)
390                 sock_kfree_s(sk, opt, opt->tot_len);
391
392         return 0;
393 }
394
395 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
396
397 /*
398  *      This does both peername and sockname.
399  */
400
401 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
402                  int *uaddr_len, int peer)
403 {
404         struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
405         struct sock *sk = sock->sk;
406         struct inet_sock *inet = inet_sk(sk);
407         struct ipv6_pinfo *np = inet6_sk(sk);
408
409         sin->sin6_family = AF_INET6;
410         sin->sin6_flowinfo = 0;
411         sin->sin6_scope_id = 0;
412         if (peer) {
413                 if (!inet->dport)
414                         return -ENOTCONN;
415                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
416                     peer == 1)
417                         return -ENOTCONN;
418                 sin->sin6_port = inet->dport;
419                 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
420                 if (np->sndflow)
421                         sin->sin6_flowinfo = np->flow_label;
422         } else {
423                 if (ipv6_addr_any(&np->rcv_saddr))
424                         ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
425                 else
426                         ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
427
428                 sin->sin6_port = inet->sport;
429         }
430         if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
431                 sin->sin6_scope_id = sk->sk_bound_dev_if;
432         *uaddr_len = sizeof(*sin);
433         return(0);
434 }
435
436 EXPORT_SYMBOL(inet6_getname);
437
438 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
439 {
440         struct sock *sk = sock->sk;
441
442         switch(cmd)
443         {
444         case SIOCGSTAMP:
445                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
446
447         case SIOCGSTAMPNS:
448                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
449
450         case SIOCADDRT:
451         case SIOCDELRT:
452
453                 return(ipv6_route_ioctl(cmd,(void __user *)arg));
454
455         case SIOCSIFADDR:
456                 return addrconf_add_ifaddr((void __user *) arg);
457         case SIOCDIFADDR:
458                 return addrconf_del_ifaddr((void __user *) arg);
459         case SIOCSIFDSTADDR:
460                 return addrconf_set_dstaddr((void __user *) arg);
461         default:
462                 if (!sk->sk_prot->ioctl)
463                         return -ENOIOCTLCMD;
464                 return sk->sk_prot->ioctl(sk, cmd, arg);
465         }
466         /*NOTREACHED*/
467         return(0);
468 }
469
470 EXPORT_SYMBOL(inet6_ioctl);
471
472 const struct proto_ops inet6_stream_ops = {
473         .family            = PF_INET6,
474         .owner             = THIS_MODULE,
475         .release           = inet6_release,
476         .bind              = inet6_bind,
477         .connect           = inet_stream_connect,       /* ok           */
478         .socketpair        = sock_no_socketpair,        /* a do nothing */
479         .accept            = inet_accept,               /* ok           */
480         .getname           = inet6_getname,
481         .poll              = tcp_poll,                  /* ok           */
482         .ioctl             = inet6_ioctl,               /* must change  */
483         .listen            = inet_listen,               /* ok           */
484         .shutdown          = inet_shutdown,             /* ok           */
485         .setsockopt        = sock_common_setsockopt,    /* ok           */
486         .getsockopt        = sock_common_getsockopt,    /* ok           */
487         .sendmsg           = tcp_sendmsg,               /* ok           */
488         .recvmsg           = sock_common_recvmsg,       /* ok           */
489         .mmap              = sock_no_mmap,
490         .sendpage          = tcp_sendpage,
491 #ifdef CONFIG_COMPAT
492         .compat_setsockopt = compat_sock_common_setsockopt,
493         .compat_getsockopt = compat_sock_common_getsockopt,
494 #endif
495 };
496
497 const struct proto_ops inet6_dgram_ops = {
498         .family            = PF_INET6,
499         .owner             = THIS_MODULE,
500         .release           = inet6_release,
501         .bind              = inet6_bind,
502         .connect           = inet_dgram_connect,        /* ok           */
503         .socketpair        = sock_no_socketpair,        /* a do nothing */
504         .accept            = sock_no_accept,            /* a do nothing */
505         .getname           = inet6_getname,
506         .poll              = udp_poll,                  /* ok           */
507         .ioctl             = inet6_ioctl,               /* must change  */
508         .listen            = sock_no_listen,            /* ok           */
509         .shutdown          = inet_shutdown,             /* ok           */
510         .setsockopt        = sock_common_setsockopt,    /* ok           */
511         .getsockopt        = sock_common_getsockopt,    /* ok           */
512         .sendmsg           = inet_sendmsg,              /* ok           */
513         .recvmsg           = sock_common_recvmsg,       /* ok           */
514         .mmap              = sock_no_mmap,
515         .sendpage          = sock_no_sendpage,
516 #ifdef CONFIG_COMPAT
517         .compat_setsockopt = compat_sock_common_setsockopt,
518         .compat_getsockopt = compat_sock_common_getsockopt,
519 #endif
520 };
521
522 static struct net_proto_family inet6_family_ops = {
523         .family = PF_INET6,
524         .create = inet6_create,
525         .owner  = THIS_MODULE,
526 };
527
528 /* Same as inet6_dgram_ops, sans udp_poll.  */
529 static const struct proto_ops inet6_sockraw_ops = {
530         .family            = PF_INET6,
531         .owner             = THIS_MODULE,
532         .release           = inet6_release,
533         .bind              = inet6_bind,
534         .connect           = inet_dgram_connect,        /* ok           */
535         .socketpair        = sock_no_socketpair,        /* a do nothing */
536         .accept            = sock_no_accept,            /* a do nothing */
537         .getname           = inet6_getname,
538         .poll              = datagram_poll,             /* ok           */
539         .ioctl             = inet6_ioctl,               /* must change  */
540         .listen            = sock_no_listen,            /* ok           */
541         .shutdown          = inet_shutdown,             /* ok           */
542         .setsockopt        = sock_common_setsockopt,    /* ok           */
543         .getsockopt        = sock_common_getsockopt,    /* ok           */
544         .sendmsg           = inet_sendmsg,              /* ok           */
545         .recvmsg           = sock_common_recvmsg,       /* ok           */
546         .mmap              = sock_no_mmap,
547         .sendpage          = sock_no_sendpage,
548 #ifdef CONFIG_COMPAT
549         .compat_setsockopt = compat_sock_common_setsockopt,
550         .compat_getsockopt = compat_sock_common_getsockopt,
551 #endif
552 };
553
554 static struct inet_protosw rawv6_protosw = {
555         .type           = SOCK_RAW,
556         .protocol       = IPPROTO_IP,   /* wild card */
557         .prot           = &rawv6_prot,
558         .ops            = &inet6_sockraw_ops,
559         .capability     = CAP_NET_RAW,
560         .no_check       = UDP_CSUM_DEFAULT,
561         .flags          = INET_PROTOSW_REUSE,
562 };
563
564 void
565 inet6_register_protosw(struct inet_protosw *p)
566 {
567         struct list_head *lh;
568         struct inet_protosw *answer;
569         int protocol = p->protocol;
570         struct list_head *last_perm;
571
572         spin_lock_bh(&inetsw6_lock);
573
574         if (p->type >= SOCK_MAX)
575                 goto out_illegal;
576
577         /* If we are trying to override a permanent protocol, bail. */
578         answer = NULL;
579         last_perm = &inetsw6[p->type];
580         list_for_each(lh, &inetsw6[p->type]) {
581                 answer = list_entry(lh, struct inet_protosw, list);
582
583                 /* Check only the non-wild match. */
584                 if (INET_PROTOSW_PERMANENT & answer->flags) {
585                         if (protocol == answer->protocol)
586                                 break;
587                         last_perm = lh;
588                 }
589
590                 answer = NULL;
591         }
592         if (answer)
593                 goto out_permanent;
594
595         /* Add the new entry after the last permanent entry if any, so that
596          * the new entry does not override a permanent entry when matched with
597          * a wild-card protocol. But it is allowed to override any existing
598          * non-permanent entry.  This means that when we remove this entry, the
599          * system automatically returns to the old behavior.
600          */
601         list_add_rcu(&p->list, last_perm);
602 out:
603         spin_unlock_bh(&inetsw6_lock);
604         return;
605
606 out_permanent:
607         printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
608                protocol);
609         goto out;
610
611 out_illegal:
612         printk(KERN_ERR
613                "Ignoring attempt to register invalid socket type %d.\n",
614                p->type);
615         goto out;
616 }
617
618 EXPORT_SYMBOL(inet6_register_protosw);
619
620 void
621 inet6_unregister_protosw(struct inet_protosw *p)
622 {
623         if (INET_PROTOSW_PERMANENT & p->flags) {
624                 printk(KERN_ERR
625                        "Attempt to unregister permanent protocol %d.\n",
626                        p->protocol);
627         } else {
628                 spin_lock_bh(&inetsw6_lock);
629                 list_del_rcu(&p->list);
630                 spin_unlock_bh(&inetsw6_lock);
631
632                 synchronize_net();
633         }
634 }
635
636 EXPORT_SYMBOL(inet6_unregister_protosw);
637
638 int inet6_sk_rebuild_header(struct sock *sk)
639 {
640         int err;
641         struct dst_entry *dst;
642         struct ipv6_pinfo *np = inet6_sk(sk);
643
644         dst = __sk_dst_check(sk, np->dst_cookie);
645
646         if (dst == NULL) {
647                 struct inet_sock *inet = inet_sk(sk);
648                 struct in6_addr *final_p = NULL, final;
649                 struct flowi fl;
650
651                 memset(&fl, 0, sizeof(fl));
652                 fl.proto = sk->sk_protocol;
653                 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
654                 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
655                 fl.fl6_flowlabel = np->flow_label;
656                 fl.oif = sk->sk_bound_dev_if;
657                 fl.fl_ip_dport = inet->dport;
658                 fl.fl_ip_sport = inet->sport;
659                 security_sk_classify_flow(sk, &fl);
660
661                 if (np->opt && np->opt->srcrt) {
662                         struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
663                         ipv6_addr_copy(&final, &fl.fl6_dst);
664                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
665                         final_p = &final;
666                 }
667
668                 err = ip6_dst_lookup(sk, &dst, &fl);
669                 if (err) {
670                         sk->sk_route_caps = 0;
671                         return err;
672                 }
673                 if (final_p)
674                         ipv6_addr_copy(&fl.fl6_dst, final_p);
675
676                 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
677                         sk->sk_err_soft = -err;
678                         return err;
679                 }
680
681                 __ip6_dst_store(sk, dst, NULL, NULL);
682         }
683
684         return 0;
685 }
686
687 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
688
689 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
690 {
691         struct ipv6_pinfo *np = inet6_sk(sk);
692         struct inet6_skb_parm *opt = IP6CB(skb);
693
694         if (np->rxopt.all) {
695                 if ((opt->hop && (np->rxopt.bits.hopopts ||
696                                   np->rxopt.bits.ohopopts)) ||
697                     ((IPV6_FLOWINFO_MASK &
698                       *(__be32 *)skb_network_header(skb)) &&
699                      np->rxopt.bits.rxflow) ||
700                     (opt->srcrt && (np->rxopt.bits.srcrt ||
701                      np->rxopt.bits.osrcrt)) ||
702                     ((opt->dst1 || opt->dst0) &&
703                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
704                         return 1;
705         }
706         return 0;
707 }
708
709 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
710
711 static int __init init_ipv6_mibs(void)
712 {
713         if (snmp_mib_init((void **)ipv6_statistics, sizeof (struct ipstats_mib),
714                           __alignof__(struct ipstats_mib)) < 0)
715                 goto err_ip_mib;
716         if (snmp_mib_init((void **)icmpv6_statistics, sizeof (struct icmpv6_mib),
717                           __alignof__(struct icmpv6_mib)) < 0)
718                 goto err_icmp_mib;
719         if (snmp_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib),
720                           __alignof__(struct udp_mib)) < 0)
721                 goto err_udp_mib;
722         if (snmp_mib_init((void **)udplite_stats_in6, sizeof (struct udp_mib),
723                           __alignof__(struct udp_mib)) < 0)
724                 goto err_udplite_mib;
725         return 0;
726
727 err_udplite_mib:
728         snmp_mib_free((void **)udp_stats_in6);
729 err_udp_mib:
730         snmp_mib_free((void **)icmpv6_statistics);
731 err_icmp_mib:
732         snmp_mib_free((void **)ipv6_statistics);
733 err_ip_mib:
734         return -ENOMEM;
735
736 }
737
738 static void cleanup_ipv6_mibs(void)
739 {
740         snmp_mib_free((void **)ipv6_statistics);
741         snmp_mib_free((void **)icmpv6_statistics);
742         snmp_mib_free((void **)udp_stats_in6);
743         snmp_mib_free((void **)udplite_stats_in6);
744 }
745
746 static int __init inet6_init(void)
747 {
748         struct sk_buff *dummy_skb;
749         struct list_head *r;
750         int err;
751
752         BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
753
754 #ifdef MODULE
755 #if 0 /* FIXME --RR */
756         if (!mod_member_present(&__this_module, can_unload))
757           return -EINVAL;
758
759         __this_module.can_unload = &ipv6_unload;
760 #endif
761 #endif
762
763         err = proto_register(&tcpv6_prot, 1);
764         if (err)
765                 goto out;
766
767         err = proto_register(&udpv6_prot, 1);
768         if (err)
769                 goto out_unregister_tcp_proto;
770
771         err = proto_register(&udplitev6_prot, 1);
772         if (err)
773                 goto out_unregister_udp_proto;
774
775         err = proto_register(&rawv6_prot, 1);
776         if (err)
777                 goto out_unregister_udplite_proto;
778
779
780         /* Register the socket-side information for inet6_create.  */
781         for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
782                 INIT_LIST_HEAD(r);
783
784         /* We MUST register RAW sockets before we create the ICMP6,
785          * IGMP6, or NDISC control sockets.
786          */
787         inet6_register_protosw(&rawv6_protosw);
788
789         /* Register the family here so that the init calls below will
790          * be able to create sockets. (?? is this dangerous ??)
791          */
792         err = sock_register(&inet6_family_ops);
793         if (err)
794                 goto out_unregister_raw_proto;
795
796         /* Initialise ipv6 mibs */
797         err = init_ipv6_mibs();
798         if (err)
799                 goto out_unregister_sock;
800
801         /*
802          *      ipngwg API draft makes clear that the correct semantics
803          *      for TCP and UDP is to consider one TCP and UDP instance
804          *      in a host availiable by both INET and INET6 APIs and
805          *      able to communicate via both network protocols.
806          */
807
808 #ifdef CONFIG_SYSCTL
809         ipv6_sysctl_register();
810 #endif
811         err = icmpv6_init(&inet6_family_ops);
812         if (err)
813                 goto icmp_fail;
814         err = ndisc_init(&inet6_family_ops);
815         if (err)
816                 goto ndisc_fail;
817         err = igmp6_init(&inet6_family_ops);
818         if (err)
819                 goto igmp_fail;
820         err = ipv6_netfilter_init();
821         if (err)
822                 goto netfilter_fail;
823         /* Create /proc/foo6 entries. */
824 #ifdef CONFIG_PROC_FS
825         err = -ENOMEM;
826         if (raw6_proc_init())
827                 goto proc_raw6_fail;
828         if (tcp6_proc_init())
829                 goto proc_tcp6_fail;
830         if (udp6_proc_init())
831                 goto proc_udp6_fail;
832         if (udplite6_proc_init())
833                 goto proc_udplite6_fail;
834         if (ipv6_misc_proc_init())
835                 goto proc_misc6_fail;
836
837         if (ac6_proc_init())
838                 goto proc_anycast6_fail;
839         if (if6_proc_init())
840                 goto proc_if6_fail;
841 #endif
842         ip6_route_init();
843         ip6_flowlabel_init();
844         err = addrconf_init();
845         if (err)
846                 goto addrconf_fail;
847
848         /* Init v6 extension headers. */
849         ipv6_rthdr_init();
850         ipv6_frag_init();
851         ipv6_nodata_init();
852         ipv6_destopt_init();
853
854         /* Init v6 transport protocols. */
855         udpv6_init();
856         udplitev6_init();
857         tcpv6_init();
858
859         ipv6_packet_init();
860         err = 0;
861 out:
862         return err;
863
864 addrconf_fail:
865         ip6_flowlabel_cleanup();
866         ip6_route_cleanup();
867 #ifdef CONFIG_PROC_FS
868         if6_proc_exit();
869 proc_if6_fail:
870         ac6_proc_exit();
871 proc_anycast6_fail:
872         ipv6_misc_proc_exit();
873 proc_misc6_fail:
874         udplite6_proc_exit();
875 proc_udplite6_fail:
876         udp6_proc_exit();
877 proc_udp6_fail:
878         tcp6_proc_exit();
879 proc_tcp6_fail:
880         raw6_proc_exit();
881 proc_raw6_fail:
882 #endif
883         ipv6_netfilter_fini();
884 netfilter_fail:
885         igmp6_cleanup();
886 igmp_fail:
887         ndisc_cleanup();
888 ndisc_fail:
889         icmpv6_cleanup();
890 icmp_fail:
891 #ifdef CONFIG_SYSCTL
892         ipv6_sysctl_unregister();
893 #endif
894         cleanup_ipv6_mibs();
895 out_unregister_sock:
896         sock_unregister(PF_INET6);
897 out_unregister_raw_proto:
898         proto_unregister(&rawv6_prot);
899 out_unregister_udplite_proto:
900         proto_unregister(&udplitev6_prot);
901 out_unregister_udp_proto:
902         proto_unregister(&udpv6_prot);
903 out_unregister_tcp_proto:
904         proto_unregister(&tcpv6_prot);
905         goto out;
906 }
907 module_init(inet6_init);
908
909 static void __exit inet6_exit(void)
910 {
911         /* First of all disallow new sockets creation. */
912         sock_unregister(PF_INET6);
913         /* Disallow any further netlink messages */
914         rtnl_unregister_all(PF_INET6);
915
916         /* Cleanup code parts. */
917         ipv6_packet_cleanup();
918
919         addrconf_cleanup();
920         ip6_flowlabel_cleanup();
921         ip6_route_cleanup();
922 #ifdef CONFIG_PROC_FS
923
924         /* Cleanup code parts. */
925         if6_proc_exit();
926         ac6_proc_exit();
927         ipv6_misc_proc_exit();
928         udplite6_proc_exit();
929         udp6_proc_exit();
930         tcp6_proc_exit();
931         raw6_proc_exit();
932 #endif
933         ipv6_netfilter_fini();
934         igmp6_cleanup();
935         ndisc_cleanup();
936         icmpv6_cleanup();
937 #ifdef CONFIG_SYSCTL
938         ipv6_sysctl_unregister();
939 #endif
940         cleanup_ipv6_mibs();
941         proto_unregister(&rawv6_prot);
942         proto_unregister(&udplitev6_prot);
943         proto_unregister(&udpv6_prot);
944         proto_unregister(&tcpv6_prot);
945 }
946 module_exit(inet6_exit);
947
948 MODULE_ALIAS_NETPROTO(PF_INET6);