Merge branch 'locks' of git://linux-nfs.org/~bfields/linux
[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 net *net, 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 (net != &init_net)
98                 return -EAFNOSUPPORT;
99
100         if (sock->type != SOCK_RAW &&
101             sock->type != SOCK_DGRAM &&
102             !inet_ehash_secret)
103                 build_ehash_secret();
104
105         /* Look for the requested type/protocol pair. */
106         answer = NULL;
107 lookup_protocol:
108         err = -ESOCKTNOSUPPORT;
109         rcu_read_lock();
110         list_for_each_rcu(p, &inetsw6[sock->type]) {
111                 answer = list_entry(p, struct inet_protosw, list);
112
113                 /* Check the non-wild match. */
114                 if (protocol == answer->protocol) {
115                         if (protocol != IPPROTO_IP)
116                                 break;
117                 } else {
118                         /* Check for the two wild cases. */
119                         if (IPPROTO_IP == protocol) {
120                                 protocol = answer->protocol;
121                                 break;
122                         }
123                         if (IPPROTO_IP == answer->protocol)
124                                 break;
125                 }
126                 err = -EPROTONOSUPPORT;
127                 answer = NULL;
128         }
129
130         if (!answer) {
131                 if (try_loading_module < 2) {
132                         rcu_read_unlock();
133                         /*
134                          * Be more specific, e.g. net-pf-10-proto-132-type-1
135                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
136                          */
137                         if (++try_loading_module == 1)
138                                 request_module("net-pf-%d-proto-%d-type-%d",
139                                                 PF_INET6, protocol, sock->type);
140                         /*
141                          * Fall back to generic, e.g. net-pf-10-proto-132
142                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
143                          */
144                         else
145                                 request_module("net-pf-%d-proto-%d",
146                                                 PF_INET6, protocol);
147                         goto lookup_protocol;
148                 } else
149                         goto out_rcu_unlock;
150         }
151
152         err = -EPERM;
153         if (answer->capability > 0 && !capable(answer->capability))
154                 goto out_rcu_unlock;
155
156         sock->ops = answer->ops;
157         answer_prot = answer->prot;
158         answer_no_check = answer->no_check;
159         answer_flags = answer->flags;
160         rcu_read_unlock();
161
162         BUG_TRAP(answer_prot->slab != NULL);
163
164         err = -ENOBUFS;
165         sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, 1);
166         if (sk == NULL)
167                 goto out;
168
169         sock_init_data(sock, sk);
170
171         err = 0;
172         sk->sk_no_check = answer_no_check;
173         if (INET_PROTOSW_REUSE & answer_flags)
174                 sk->sk_reuse = 1;
175
176         inet = inet_sk(sk);
177         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
178
179         if (SOCK_RAW == sock->type) {
180                 inet->num = protocol;
181                 if (IPPROTO_RAW == protocol)
182                         inet->hdrincl = 1;
183         }
184
185         sk->sk_destruct         = inet_sock_destruct;
186         sk->sk_family           = PF_INET6;
187         sk->sk_protocol         = protocol;
188
189         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
190
191         inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
192         np->hop_limit   = -1;
193         np->mcast_hops  = -1;
194         np->mc_loop     = 1;
195         np->pmtudisc    = IPV6_PMTUDISC_WANT;
196         np->ipv6only    = sysctl_ipv6_bindv6only;
197
198         /* Init the ipv4 part of the socket since we can have sockets
199          * using v6 API for ipv4.
200          */
201         inet->uc_ttl    = -1;
202
203         inet->mc_loop   = 1;
204         inet->mc_ttl    = 1;
205         inet->mc_index  = 0;
206         inet->mc_list   = NULL;
207
208         if (ipv4_config.no_pmtu_disc)
209                 inet->pmtudisc = IP_PMTUDISC_DONT;
210         else
211                 inet->pmtudisc = IP_PMTUDISC_WANT;
212         /*
213          * Increment only the relevant sk_prot->socks debug field, this changes
214          * the previous behaviour of incrementing both the equivalent to
215          * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
216          *
217          * This allows better debug granularity as we'll know exactly how many
218          * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
219          * transport protocol socks. -acme
220          */
221         sk_refcnt_debug_inc(sk);
222
223         if (inet->num) {
224                 /* It assumes that any protocol which allows
225                  * the user to assign a number at socket
226                  * creation time automatically shares.
227                  */
228                 inet->sport = htons(inet->num);
229                 sk->sk_prot->hash(sk);
230         }
231         if (sk->sk_prot->init) {
232                 err = sk->sk_prot->init(sk);
233                 if (err) {
234                         sk_common_release(sk);
235                         goto out;
236                 }
237         }
238 out:
239         return err;
240 out_rcu_unlock:
241         rcu_read_unlock();
242         goto out;
243 }
244
245
246 /* bind for INET6 API */
247 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
248 {
249         struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
250         struct sock *sk = sock->sk;
251         struct inet_sock *inet = inet_sk(sk);
252         struct ipv6_pinfo *np = inet6_sk(sk);
253         __be32 v4addr = 0;
254         unsigned short snum;
255         int addr_type = 0;
256         int err = 0;
257
258         /* If the socket has its own bind function then use it. */
259         if (sk->sk_prot->bind)
260                 return sk->sk_prot->bind(sk, uaddr, addr_len);
261
262         if (addr_len < SIN6_LEN_RFC2133)
263                 return -EINVAL;
264         addr_type = ipv6_addr_type(&addr->sin6_addr);
265         if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
266                 return -EINVAL;
267
268         snum = ntohs(addr->sin6_port);
269         if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
270                 return -EACCES;
271
272         lock_sock(sk);
273
274         /* Check these errors (active socket, double bind). */
275         if (sk->sk_state != TCP_CLOSE || inet->num) {
276                 err = -EINVAL;
277                 goto out;
278         }
279
280         /* Check if the address belongs to the host. */
281         if (addr_type == IPV6_ADDR_MAPPED) {
282                 v4addr = addr->sin6_addr.s6_addr32[3];
283                 if (inet_addr_type(v4addr) != RTN_LOCAL) {
284                         err = -EADDRNOTAVAIL;
285                         goto out;
286                 }
287         } else {
288                 if (addr_type != IPV6_ADDR_ANY) {
289                         struct net_device *dev = NULL;
290
291                         if (addr_type & IPV6_ADDR_LINKLOCAL) {
292                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
293                                     addr->sin6_scope_id) {
294                                         /* Override any existing binding, if another one
295                                          * is supplied by user.
296                                          */
297                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
298                                 }
299
300                                 /* Binding to link-local address requires an interface */
301                                 if (!sk->sk_bound_dev_if) {
302                                         err = -EINVAL;
303                                         goto out;
304                                 }
305                                 dev = dev_get_by_index(&init_net, sk->sk_bound_dev_if);
306                                 if (!dev) {
307                                         err = -ENODEV;
308                                         goto out;
309                                 }
310                         }
311
312                         /* ipv4 addr of the socket is invalid.  Only the
313                          * unspecified and mapped address have a v4 equivalent.
314                          */
315                         v4addr = LOOPBACK4_IPV6;
316                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
317                                 if (!ipv6_chk_addr(&addr->sin6_addr, dev, 0)) {
318                                         if (dev)
319                                                 dev_put(dev);
320                                         err = -EADDRNOTAVAIL;
321                                         goto out;
322                                 }
323                         }
324                         if (dev)
325                                 dev_put(dev);
326                 }
327         }
328
329         inet->rcv_saddr = v4addr;
330         inet->saddr = v4addr;
331
332         ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
333
334         if (!(addr_type & IPV6_ADDR_MULTICAST))
335                 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
336
337         /* Make sure we are allowed to bind here. */
338         if (sk->sk_prot->get_port(sk, snum)) {
339                 inet_reset_saddr(sk);
340                 err = -EADDRINUSE;
341                 goto out;
342         }
343
344         if (addr_type != IPV6_ADDR_ANY)
345                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
346         if (snum)
347                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
348         inet->sport = htons(inet->num);
349         inet->dport = 0;
350         inet->daddr = 0;
351 out:
352         release_sock(sk);
353         return err;
354 }
355
356 EXPORT_SYMBOL(inet6_bind);
357
358 int inet6_release(struct socket *sock)
359 {
360         struct sock *sk = sock->sk;
361
362         if (sk == NULL)
363                 return -EINVAL;
364
365         /* Free mc lists */
366         ipv6_sock_mc_close(sk);
367
368         /* Free ac lists */
369         ipv6_sock_ac_close(sk);
370
371         return inet_release(sock);
372 }
373
374 EXPORT_SYMBOL(inet6_release);
375
376 int inet6_destroy_sock(struct sock *sk)
377 {
378         struct ipv6_pinfo *np = inet6_sk(sk);
379         struct sk_buff *skb;
380         struct ipv6_txoptions *opt;
381
382         /* Release rx options */
383
384         if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
385                 kfree_skb(skb);
386
387         /* Free flowlabels */
388         fl6_free_socklist(sk);
389
390         /* Free tx options */
391
392         if ((opt = xchg(&np->opt, NULL)) != NULL)
393                 sock_kfree_s(sk, opt, opt->tot_len);
394
395         return 0;
396 }
397
398 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
399
400 /*
401  *      This does both peername and sockname.
402  */
403
404 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
405                  int *uaddr_len, int peer)
406 {
407         struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
408         struct sock *sk = sock->sk;
409         struct inet_sock *inet = inet_sk(sk);
410         struct ipv6_pinfo *np = inet6_sk(sk);
411
412         sin->sin6_family = AF_INET6;
413         sin->sin6_flowinfo = 0;
414         sin->sin6_scope_id = 0;
415         if (peer) {
416                 if (!inet->dport)
417                         return -ENOTCONN;
418                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
419                     peer == 1)
420                         return -ENOTCONN;
421                 sin->sin6_port = inet->dport;
422                 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
423                 if (np->sndflow)
424                         sin->sin6_flowinfo = np->flow_label;
425         } else {
426                 if (ipv6_addr_any(&np->rcv_saddr))
427                         ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
428                 else
429                         ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
430
431                 sin->sin6_port = inet->sport;
432         }
433         if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
434                 sin->sin6_scope_id = sk->sk_bound_dev_if;
435         *uaddr_len = sizeof(*sin);
436         return(0);
437 }
438
439 EXPORT_SYMBOL(inet6_getname);
440
441 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
442 {
443         struct sock *sk = sock->sk;
444
445         switch(cmd)
446         {
447         case SIOCGSTAMP:
448                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
449
450         case SIOCGSTAMPNS:
451                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
452
453         case SIOCADDRT:
454         case SIOCDELRT:
455
456                 return(ipv6_route_ioctl(cmd,(void __user *)arg));
457
458         case SIOCSIFADDR:
459                 return addrconf_add_ifaddr((void __user *) arg);
460         case SIOCDIFADDR:
461                 return addrconf_del_ifaddr((void __user *) arg);
462         case SIOCSIFDSTADDR:
463                 return addrconf_set_dstaddr((void __user *) arg);
464         default:
465                 if (!sk->sk_prot->ioctl)
466                         return -ENOIOCTLCMD;
467                 return sk->sk_prot->ioctl(sk, cmd, arg);
468         }
469         /*NOTREACHED*/
470         return(0);
471 }
472
473 EXPORT_SYMBOL(inet6_ioctl);
474
475 const struct proto_ops inet6_stream_ops = {
476         .family            = PF_INET6,
477         .owner             = THIS_MODULE,
478         .release           = inet6_release,
479         .bind              = inet6_bind,
480         .connect           = inet_stream_connect,       /* ok           */
481         .socketpair        = sock_no_socketpair,        /* a do nothing */
482         .accept            = inet_accept,               /* ok           */
483         .getname           = inet6_getname,
484         .poll              = tcp_poll,                  /* ok           */
485         .ioctl             = inet6_ioctl,               /* must change  */
486         .listen            = inet_listen,               /* ok           */
487         .shutdown          = inet_shutdown,             /* ok           */
488         .setsockopt        = sock_common_setsockopt,    /* ok           */
489         .getsockopt        = sock_common_getsockopt,    /* ok           */
490         .sendmsg           = tcp_sendmsg,               /* ok           */
491         .recvmsg           = sock_common_recvmsg,       /* ok           */
492         .mmap              = sock_no_mmap,
493         .sendpage          = tcp_sendpage,
494 #ifdef CONFIG_COMPAT
495         .compat_setsockopt = compat_sock_common_setsockopt,
496         .compat_getsockopt = compat_sock_common_getsockopt,
497 #endif
498 };
499
500 const struct proto_ops inet6_dgram_ops = {
501         .family            = PF_INET6,
502         .owner             = THIS_MODULE,
503         .release           = inet6_release,
504         .bind              = inet6_bind,
505         .connect           = inet_dgram_connect,        /* ok           */
506         .socketpair        = sock_no_socketpair,        /* a do nothing */
507         .accept            = sock_no_accept,            /* a do nothing */
508         .getname           = inet6_getname,
509         .poll              = udp_poll,                  /* ok           */
510         .ioctl             = inet6_ioctl,               /* must change  */
511         .listen            = sock_no_listen,            /* ok           */
512         .shutdown          = inet_shutdown,             /* ok           */
513         .setsockopt        = sock_common_setsockopt,    /* ok           */
514         .getsockopt        = sock_common_getsockopt,    /* ok           */
515         .sendmsg           = inet_sendmsg,              /* ok           */
516         .recvmsg           = sock_common_recvmsg,       /* ok           */
517         .mmap              = sock_no_mmap,
518         .sendpage          = sock_no_sendpage,
519 #ifdef CONFIG_COMPAT
520         .compat_setsockopt = compat_sock_common_setsockopt,
521         .compat_getsockopt = compat_sock_common_getsockopt,
522 #endif
523 };
524
525 static struct net_proto_family inet6_family_ops = {
526         .family = PF_INET6,
527         .create = inet6_create,
528         .owner  = THIS_MODULE,
529 };
530
531 /* Same as inet6_dgram_ops, sans udp_poll.  */
532 static const struct proto_ops inet6_sockraw_ops = {
533         .family            = PF_INET6,
534         .owner             = THIS_MODULE,
535         .release           = inet6_release,
536         .bind              = inet6_bind,
537         .connect           = inet_dgram_connect,        /* ok           */
538         .socketpair        = sock_no_socketpair,        /* a do nothing */
539         .accept            = sock_no_accept,            /* a do nothing */
540         .getname           = inet6_getname,
541         .poll              = datagram_poll,             /* ok           */
542         .ioctl             = inet6_ioctl,               /* must change  */
543         .listen            = sock_no_listen,            /* ok           */
544         .shutdown          = inet_shutdown,             /* ok           */
545         .setsockopt        = sock_common_setsockopt,    /* ok           */
546         .getsockopt        = sock_common_getsockopt,    /* ok           */
547         .sendmsg           = inet_sendmsg,              /* ok           */
548         .recvmsg           = sock_common_recvmsg,       /* ok           */
549         .mmap              = sock_no_mmap,
550         .sendpage          = sock_no_sendpage,
551 #ifdef CONFIG_COMPAT
552         .compat_setsockopt = compat_sock_common_setsockopt,
553         .compat_getsockopt = compat_sock_common_getsockopt,
554 #endif
555 };
556
557 static struct inet_protosw rawv6_protosw = {
558         .type           = SOCK_RAW,
559         .protocol       = IPPROTO_IP,   /* wild card */
560         .prot           = &rawv6_prot,
561         .ops            = &inet6_sockraw_ops,
562         .capability     = CAP_NET_RAW,
563         .no_check       = UDP_CSUM_DEFAULT,
564         .flags          = INET_PROTOSW_REUSE,
565 };
566
567 void
568 inet6_register_protosw(struct inet_protosw *p)
569 {
570         struct list_head *lh;
571         struct inet_protosw *answer;
572         int protocol = p->protocol;
573         struct list_head *last_perm;
574
575         spin_lock_bh(&inetsw6_lock);
576
577         if (p->type >= SOCK_MAX)
578                 goto out_illegal;
579
580         /* If we are trying to override a permanent protocol, bail. */
581         answer = NULL;
582         last_perm = &inetsw6[p->type];
583         list_for_each(lh, &inetsw6[p->type]) {
584                 answer = list_entry(lh, struct inet_protosw, list);
585
586                 /* Check only the non-wild match. */
587                 if (INET_PROTOSW_PERMANENT & answer->flags) {
588                         if (protocol == answer->protocol)
589                                 break;
590                         last_perm = lh;
591                 }
592
593                 answer = NULL;
594         }
595         if (answer)
596                 goto out_permanent;
597
598         /* Add the new entry after the last permanent entry if any, so that
599          * the new entry does not override a permanent entry when matched with
600          * a wild-card protocol. But it is allowed to override any existing
601          * non-permanent entry.  This means that when we remove this entry, the
602          * system automatically returns to the old behavior.
603          */
604         list_add_rcu(&p->list, last_perm);
605 out:
606         spin_unlock_bh(&inetsw6_lock);
607         return;
608
609 out_permanent:
610         printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
611                protocol);
612         goto out;
613
614 out_illegal:
615         printk(KERN_ERR
616                "Ignoring attempt to register invalid socket type %d.\n",
617                p->type);
618         goto out;
619 }
620
621 EXPORT_SYMBOL(inet6_register_protosw);
622
623 void
624 inet6_unregister_protosw(struct inet_protosw *p)
625 {
626         if (INET_PROTOSW_PERMANENT & p->flags) {
627                 printk(KERN_ERR
628                        "Attempt to unregister permanent protocol %d.\n",
629                        p->protocol);
630         } else {
631                 spin_lock_bh(&inetsw6_lock);
632                 list_del_rcu(&p->list);
633                 spin_unlock_bh(&inetsw6_lock);
634
635                 synchronize_net();
636         }
637 }
638
639 EXPORT_SYMBOL(inet6_unregister_protosw);
640
641 int inet6_sk_rebuild_header(struct sock *sk)
642 {
643         int err;
644         struct dst_entry *dst;
645         struct ipv6_pinfo *np = inet6_sk(sk);
646
647         dst = __sk_dst_check(sk, np->dst_cookie);
648
649         if (dst == NULL) {
650                 struct inet_sock *inet = inet_sk(sk);
651                 struct in6_addr *final_p = NULL, final;
652                 struct flowi fl;
653
654                 memset(&fl, 0, sizeof(fl));
655                 fl.proto = sk->sk_protocol;
656                 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
657                 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
658                 fl.fl6_flowlabel = np->flow_label;
659                 fl.oif = sk->sk_bound_dev_if;
660                 fl.fl_ip_dport = inet->dport;
661                 fl.fl_ip_sport = inet->sport;
662                 security_sk_classify_flow(sk, &fl);
663
664                 if (np->opt && np->opt->srcrt) {
665                         struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
666                         ipv6_addr_copy(&final, &fl.fl6_dst);
667                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
668                         final_p = &final;
669                 }
670
671                 err = ip6_dst_lookup(sk, &dst, &fl);
672                 if (err) {
673                         sk->sk_route_caps = 0;
674                         return err;
675                 }
676                 if (final_p)
677                         ipv6_addr_copy(&fl.fl6_dst, final_p);
678
679                 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
680                         sk->sk_err_soft = -err;
681                         return err;
682                 }
683
684                 __ip6_dst_store(sk, dst, NULL, NULL);
685         }
686
687         return 0;
688 }
689
690 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
691
692 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
693 {
694         struct ipv6_pinfo *np = inet6_sk(sk);
695         struct inet6_skb_parm *opt = IP6CB(skb);
696
697         if (np->rxopt.all) {
698                 if ((opt->hop && (np->rxopt.bits.hopopts ||
699                                   np->rxopt.bits.ohopopts)) ||
700                     ((IPV6_FLOWINFO_MASK &
701                       *(__be32 *)skb_network_header(skb)) &&
702                      np->rxopt.bits.rxflow) ||
703                     (opt->srcrt && (np->rxopt.bits.srcrt ||
704                      np->rxopt.bits.osrcrt)) ||
705                     ((opt->dst1 || opt->dst0) &&
706                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
707                         return 1;
708         }
709         return 0;
710 }
711
712 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
713
714 static int __init init_ipv6_mibs(void)
715 {
716         if (snmp_mib_init((void **)ipv6_statistics, sizeof (struct ipstats_mib),
717                           __alignof__(struct ipstats_mib)) < 0)
718                 goto err_ip_mib;
719         if (snmp_mib_init((void **)icmpv6_statistics, sizeof (struct icmpv6_mib),
720                           __alignof__(struct icmpv6_mib)) < 0)
721                 goto err_icmp_mib;
722         if (snmp_mib_init((void **)icmpv6msg_statistics,
723             sizeof (struct icmpv6msg_mib), __alignof__(struct icmpv6_mib)) < 0)
724                 goto err_icmpmsg_mib;
725         if (snmp_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib),
726                           __alignof__(struct udp_mib)) < 0)
727                 goto err_udp_mib;
728         if (snmp_mib_init((void **)udplite_stats_in6, sizeof (struct udp_mib),
729                           __alignof__(struct udp_mib)) < 0)
730                 goto err_udplite_mib;
731         return 0;
732
733 err_udplite_mib:
734         snmp_mib_free((void **)udp_stats_in6);
735 err_udp_mib:
736         snmp_mib_free((void **)icmpv6msg_statistics);
737 err_icmpmsg_mib:
738         snmp_mib_free((void **)icmpv6_statistics);
739 err_icmp_mib:
740         snmp_mib_free((void **)ipv6_statistics);
741 err_ip_mib:
742         return -ENOMEM;
743
744 }
745
746 static void cleanup_ipv6_mibs(void)
747 {
748         snmp_mib_free((void **)ipv6_statistics);
749         snmp_mib_free((void **)icmpv6_statistics);
750         snmp_mib_free((void **)udp_stats_in6);
751         snmp_mib_free((void **)udplite_stats_in6);
752 }
753
754 static int __init inet6_init(void)
755 {
756         struct sk_buff *dummy_skb;
757         struct list_head *r;
758         int err;
759
760         BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
761
762 #ifdef MODULE
763 #if 0 /* FIXME --RR */
764         if (!mod_member_present(&__this_module, can_unload))
765           return -EINVAL;
766
767         __this_module.can_unload = &ipv6_unload;
768 #endif
769 #endif
770
771         err = proto_register(&tcpv6_prot, 1);
772         if (err)
773                 goto out;
774
775         err = proto_register(&udpv6_prot, 1);
776         if (err)
777                 goto out_unregister_tcp_proto;
778
779         err = proto_register(&udplitev6_prot, 1);
780         if (err)
781                 goto out_unregister_udp_proto;
782
783         err = proto_register(&rawv6_prot, 1);
784         if (err)
785                 goto out_unregister_udplite_proto;
786
787
788         /* Register the socket-side information for inet6_create.  */
789         for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
790                 INIT_LIST_HEAD(r);
791
792         /* We MUST register RAW sockets before we create the ICMP6,
793          * IGMP6, or NDISC control sockets.
794          */
795         inet6_register_protosw(&rawv6_protosw);
796
797         /* Register the family here so that the init calls below will
798          * be able to create sockets. (?? is this dangerous ??)
799          */
800         err = sock_register(&inet6_family_ops);
801         if (err)
802                 goto out_unregister_raw_proto;
803
804         /* Initialise ipv6 mibs */
805         err = init_ipv6_mibs();
806         if (err)
807                 goto out_unregister_sock;
808
809         /*
810          *      ipngwg API draft makes clear that the correct semantics
811          *      for TCP and UDP is to consider one TCP and UDP instance
812          *      in a host availiable by both INET and INET6 APIs and
813          *      able to communicate via both network protocols.
814          */
815
816 #ifdef CONFIG_SYSCTL
817         ipv6_sysctl_register();
818 #endif
819         err = icmpv6_init(&inet6_family_ops);
820         if (err)
821                 goto icmp_fail;
822         err = ndisc_init(&inet6_family_ops);
823         if (err)
824                 goto ndisc_fail;
825         err = igmp6_init(&inet6_family_ops);
826         if (err)
827                 goto igmp_fail;
828         err = ipv6_netfilter_init();
829         if (err)
830                 goto netfilter_fail;
831         /* Create /proc/foo6 entries. */
832 #ifdef CONFIG_PROC_FS
833         err = -ENOMEM;
834         if (raw6_proc_init())
835                 goto proc_raw6_fail;
836         if (tcp6_proc_init())
837                 goto proc_tcp6_fail;
838         if (udp6_proc_init())
839                 goto proc_udp6_fail;
840         if (udplite6_proc_init())
841                 goto proc_udplite6_fail;
842         if (ipv6_misc_proc_init())
843                 goto proc_misc6_fail;
844
845         if (ac6_proc_init())
846                 goto proc_anycast6_fail;
847         if (if6_proc_init())
848                 goto proc_if6_fail;
849 #endif
850         ip6_route_init();
851         ip6_flowlabel_init();
852         err = addrconf_init();
853         if (err)
854                 goto addrconf_fail;
855
856         /* Init v6 extension headers. */
857         ipv6_rthdr_init();
858         ipv6_frag_init();
859         ipv6_nodata_init();
860         ipv6_destopt_init();
861
862         /* Init v6 transport protocols. */
863         udpv6_init();
864         udplitev6_init();
865         tcpv6_init();
866
867         ipv6_packet_init();
868         err = 0;
869 out:
870         return err;
871
872 addrconf_fail:
873         ip6_flowlabel_cleanup();
874         ip6_route_cleanup();
875 #ifdef CONFIG_PROC_FS
876         if6_proc_exit();
877 proc_if6_fail:
878         ac6_proc_exit();
879 proc_anycast6_fail:
880         ipv6_misc_proc_exit();
881 proc_misc6_fail:
882         udplite6_proc_exit();
883 proc_udplite6_fail:
884         udp6_proc_exit();
885 proc_udp6_fail:
886         tcp6_proc_exit();
887 proc_tcp6_fail:
888         raw6_proc_exit();
889 proc_raw6_fail:
890 #endif
891         ipv6_netfilter_fini();
892 netfilter_fail:
893         igmp6_cleanup();
894 igmp_fail:
895         ndisc_cleanup();
896 ndisc_fail:
897         icmpv6_cleanup();
898 icmp_fail:
899 #ifdef CONFIG_SYSCTL
900         ipv6_sysctl_unregister();
901 #endif
902         cleanup_ipv6_mibs();
903 out_unregister_sock:
904         sock_unregister(PF_INET6);
905 out_unregister_raw_proto:
906         proto_unregister(&rawv6_prot);
907 out_unregister_udplite_proto:
908         proto_unregister(&udplitev6_prot);
909 out_unregister_udp_proto:
910         proto_unregister(&udpv6_prot);
911 out_unregister_tcp_proto:
912         proto_unregister(&tcpv6_prot);
913         goto out;
914 }
915 module_init(inet6_init);
916
917 static void __exit inet6_exit(void)
918 {
919         /* First of all disallow new sockets creation. */
920         sock_unregister(PF_INET6);
921         /* Disallow any further netlink messages */
922         rtnl_unregister_all(PF_INET6);
923
924         /* Cleanup code parts. */
925         ipv6_packet_cleanup();
926
927         addrconf_cleanup();
928         ip6_flowlabel_cleanup();
929         ip6_route_cleanup();
930 #ifdef CONFIG_PROC_FS
931
932         /* Cleanup code parts. */
933         if6_proc_exit();
934         ac6_proc_exit();
935         ipv6_misc_proc_exit();
936         udplite6_proc_exit();
937         udp6_proc_exit();
938         tcp6_proc_exit();
939         raw6_proc_exit();
940 #endif
941         ipv6_netfilter_fini();
942         igmp6_cleanup();
943         ndisc_cleanup();
944         icmpv6_cleanup();
945 #ifdef CONFIG_SYSCTL
946         ipv6_sysctl_unregister();
947 #endif
948         cleanup_ipv6_mibs();
949         proto_unregister(&rawv6_prot);
950         proto_unregister(&udplitev6_prot);
951         proto_unregister(&udpv6_prot);
952         proto_unregister(&tcpv6_prot);
953 }
954 module_exit(inet6_exit);
955
956 MODULE_ALIAS_NETPROTO(PF_INET6);