netfilter: add nf_ipv6_ops hook to fix xt_addrtype with IPv6
[linux-3.10.git] / 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  *      Fixes:
11  *      piggy, Karl Knutson     :       Socket protocol table
12  *      Hideaki YOSHIFUJI       :       sin6_scope_id support
13  *      Arnaldo Melo            :       check proc_net_create return, cleanups
14  *
15  *      This program is free software; you can redistribute it and/or
16  *      modify it under the terms of the GNU General Public License
17  *      as published by the Free Software Foundation; either version
18  *      2 of the License, or (at your option) any later version.
19  */
20
21 #define pr_fmt(fmt) "IPv6: " fmt
22
23 #include <linux/module.h>
24 #include <linux/capability.h>
25 #include <linux/errno.h>
26 #include <linux/types.h>
27 #include <linux/socket.h>
28 #include <linux/in.h>
29 #include <linux/kernel.h>
30 #include <linux/timer.h>
31 #include <linux/string.h>
32 #include <linux/sockios.h>
33 #include <linux/net.h>
34 #include <linux/fcntl.h>
35 #include <linux/mm.h>
36 #include <linux/interrupt.h>
37 #include <linux/proc_fs.h>
38 #include <linux/stat.h>
39 #include <linux/init.h>
40 #include <linux/slab.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/protocol.h>
53 #include <net/inet_common.h>
54 #include <net/route.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 <linux/mroute6.h>
64
65 MODULE_AUTHOR("Cast of dozens");
66 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
67 MODULE_LICENSE("GPL");
68
69 /* The inetsw6 table contains everything that inet6_create needs to
70  * build a new socket.
71  */
72 static struct list_head inetsw6[SOCK_MAX];
73 static DEFINE_SPINLOCK(inetsw6_lock);
74
75 struct ipv6_params ipv6_defaults = {
76         .disable_ipv6 = 0,
77         .autoconf = 1,
78 };
79
80 static int disable_ipv6_mod;
81
82 module_param_named(disable, disable_ipv6_mod, int, 0444);
83 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
84
85 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
86 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
87
88 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
89 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
90
91 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
92 {
93         const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
94
95         return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
96 }
97
98 static int inet6_create(struct net *net, struct socket *sock, int protocol,
99                         int kern)
100 {
101         struct inet_sock *inet;
102         struct ipv6_pinfo *np;
103         struct sock *sk;
104         struct inet_protosw *answer;
105         struct proto *answer_prot;
106         unsigned char answer_flags;
107         char answer_no_check;
108         int try_loading_module = 0;
109         int err;
110
111         if (sock->type != SOCK_RAW &&
112             sock->type != SOCK_DGRAM &&
113             !inet_ehash_secret)
114                 build_ehash_secret();
115
116         /* Look for the requested type/protocol pair. */
117 lookup_protocol:
118         err = -ESOCKTNOSUPPORT;
119         rcu_read_lock();
120         list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
121
122                 err = 0;
123                 /* Check the non-wild match. */
124                 if (protocol == answer->protocol) {
125                         if (protocol != IPPROTO_IP)
126                                 break;
127                 } else {
128                         /* Check for the two wild cases. */
129                         if (IPPROTO_IP == protocol) {
130                                 protocol = answer->protocol;
131                                 break;
132                         }
133                         if (IPPROTO_IP == answer->protocol)
134                                 break;
135                 }
136                 err = -EPROTONOSUPPORT;
137         }
138
139         if (err) {
140                 if (try_loading_module < 2) {
141                         rcu_read_unlock();
142                         /*
143                          * Be more specific, e.g. net-pf-10-proto-132-type-1
144                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
145                          */
146                         if (++try_loading_module == 1)
147                                 request_module("net-pf-%d-proto-%d-type-%d",
148                                                 PF_INET6, protocol, sock->type);
149                         /*
150                          * Fall back to generic, e.g. net-pf-10-proto-132
151                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
152                          */
153                         else
154                                 request_module("net-pf-%d-proto-%d",
155                                                 PF_INET6, protocol);
156                         goto lookup_protocol;
157                 } else
158                         goto out_rcu_unlock;
159         }
160
161         err = -EPERM;
162         if (sock->type == SOCK_RAW && !kern &&
163             !ns_capable(net->user_ns, CAP_NET_RAW))
164                 goto out_rcu_unlock;
165
166         sock->ops = answer->ops;
167         answer_prot = answer->prot;
168         answer_no_check = answer->no_check;
169         answer_flags = answer->flags;
170         rcu_read_unlock();
171
172         WARN_ON(answer_prot->slab == NULL);
173
174         err = -ENOBUFS;
175         sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot);
176         if (sk == NULL)
177                 goto out;
178
179         sock_init_data(sock, sk);
180
181         err = 0;
182         sk->sk_no_check = answer_no_check;
183         if (INET_PROTOSW_REUSE & answer_flags)
184                 sk->sk_reuse = SK_CAN_REUSE;
185
186         inet = inet_sk(sk);
187         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
188
189         if (SOCK_RAW == sock->type) {
190                 inet->inet_num = protocol;
191                 if (IPPROTO_RAW == protocol)
192                         inet->hdrincl = 1;
193         }
194
195         sk->sk_destruct         = inet_sock_destruct;
196         sk->sk_family           = PF_INET6;
197         sk->sk_protocol         = protocol;
198
199         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
200
201         inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
202         np->hop_limit   = -1;
203         np->mcast_hops  = IPV6_DEFAULT_MCASTHOPS;
204         np->mc_loop     = 1;
205         np->pmtudisc    = IPV6_PMTUDISC_WANT;
206         np->ipv6only    = net->ipv6.sysctl.bindv6only;
207
208         /* Init the ipv4 part of the socket since we can have sockets
209          * using v6 API for ipv4.
210          */
211         inet->uc_ttl    = -1;
212
213         inet->mc_loop   = 1;
214         inet->mc_ttl    = 1;
215         inet->mc_index  = 0;
216         inet->mc_list   = NULL;
217         inet->rcv_tos   = 0;
218
219         if (ipv4_config.no_pmtu_disc)
220                 inet->pmtudisc = IP_PMTUDISC_DONT;
221         else
222                 inet->pmtudisc = IP_PMTUDISC_WANT;
223         /*
224          * Increment only the relevant sk_prot->socks debug field, this changes
225          * the previous behaviour of incrementing both the equivalent to
226          * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
227          *
228          * This allows better debug granularity as we'll know exactly how many
229          * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
230          * transport protocol socks. -acme
231          */
232         sk_refcnt_debug_inc(sk);
233
234         if (inet->inet_num) {
235                 /* It assumes that any protocol which allows
236                  * the user to assign a number at socket
237                  * creation time automatically shares.
238                  */
239                 inet->inet_sport = htons(inet->inet_num);
240                 sk->sk_prot->hash(sk);
241         }
242         if (sk->sk_prot->init) {
243                 err = sk->sk_prot->init(sk);
244                 if (err) {
245                         sk_common_release(sk);
246                         goto out;
247                 }
248         }
249 out:
250         return err;
251 out_rcu_unlock:
252         rcu_read_unlock();
253         goto out;
254 }
255
256
257 /* bind for INET6 API */
258 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
259 {
260         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
261         struct sock *sk = sock->sk;
262         struct inet_sock *inet = inet_sk(sk);
263         struct ipv6_pinfo *np = inet6_sk(sk);
264         struct net *net = sock_net(sk);
265         __be32 v4addr = 0;
266         unsigned short snum;
267         int addr_type = 0;
268         int err = 0;
269
270         /* If the socket has its own bind function then use it. */
271         if (sk->sk_prot->bind)
272                 return sk->sk_prot->bind(sk, uaddr, addr_len);
273
274         if (addr_len < SIN6_LEN_RFC2133)
275                 return -EINVAL;
276
277         if (addr->sin6_family != AF_INET6)
278                 return -EAFNOSUPPORT;
279
280         addr_type = ipv6_addr_type(&addr->sin6_addr);
281         if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
282                 return -EINVAL;
283
284         snum = ntohs(addr->sin6_port);
285         if (snum && snum < PROT_SOCK && !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
286                 return -EACCES;
287
288         lock_sock(sk);
289
290         /* Check these errors (active socket, double bind). */
291         if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
292                 err = -EINVAL;
293                 goto out;
294         }
295
296         /* Check if the address belongs to the host. */
297         if (addr_type == IPV6_ADDR_MAPPED) {
298                 int chk_addr_ret;
299
300                 /* Binding to v4-mapped address on a v6-only socket
301                  * makes no sense
302                  */
303                 if (np->ipv6only) {
304                         err = -EINVAL;
305                         goto out;
306                 }
307
308                 /* Reproduce AF_INET checks to make the bindings consistent */
309                 v4addr = addr->sin6_addr.s6_addr32[3];
310                 chk_addr_ret = inet_addr_type(net, v4addr);
311                 if (!sysctl_ip_nonlocal_bind &&
312                     !(inet->freebind || inet->transparent) &&
313                     v4addr != htonl(INADDR_ANY) &&
314                     chk_addr_ret != RTN_LOCAL &&
315                     chk_addr_ret != RTN_MULTICAST &&
316                     chk_addr_ret != RTN_BROADCAST) {
317                         err = -EADDRNOTAVAIL;
318                         goto out;
319                 }
320         } else {
321                 if (addr_type != IPV6_ADDR_ANY) {
322                         struct net_device *dev = NULL;
323
324                         rcu_read_lock();
325                         if (__ipv6_addr_needs_scope_id(addr_type)) {
326                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
327                                     addr->sin6_scope_id) {
328                                         /* Override any existing binding, if another one
329                                          * is supplied by user.
330                                          */
331                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
332                                 }
333
334                                 /* Binding to link-local address requires an interface */
335                                 if (!sk->sk_bound_dev_if) {
336                                         err = -EINVAL;
337                                         goto out_unlock;
338                                 }
339                                 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
340                                 if (!dev) {
341                                         err = -ENODEV;
342                                         goto out_unlock;
343                                 }
344                         }
345
346                         /* ipv4 addr of the socket is invalid.  Only the
347                          * unspecified and mapped address have a v4 equivalent.
348                          */
349                         v4addr = LOOPBACK4_IPV6;
350                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
351                                 if (!(inet->freebind || inet->transparent) &&
352                                     !ipv6_chk_addr(net, &addr->sin6_addr,
353                                                    dev, 0)) {
354                                         err = -EADDRNOTAVAIL;
355                                         goto out_unlock;
356                                 }
357                         }
358                         rcu_read_unlock();
359                 }
360         }
361
362         inet->inet_rcv_saddr = v4addr;
363         inet->inet_saddr = v4addr;
364
365         np->rcv_saddr = addr->sin6_addr;
366
367         if (!(addr_type & IPV6_ADDR_MULTICAST))
368                 np->saddr = addr->sin6_addr;
369
370         /* Make sure we are allowed to bind here. */
371         if (sk->sk_prot->get_port(sk, snum)) {
372                 inet_reset_saddr(sk);
373                 err = -EADDRINUSE;
374                 goto out;
375         }
376
377         if (addr_type != IPV6_ADDR_ANY) {
378                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
379                 if (addr_type != IPV6_ADDR_MAPPED)
380                         np->ipv6only = 1;
381         }
382         if (snum)
383                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
384         inet->inet_sport = htons(inet->inet_num);
385         inet->inet_dport = 0;
386         inet->inet_daddr = 0;
387 out:
388         release_sock(sk);
389         return err;
390 out_unlock:
391         rcu_read_unlock();
392         goto out;
393 }
394 EXPORT_SYMBOL(inet6_bind);
395
396 int inet6_release(struct socket *sock)
397 {
398         struct sock *sk = sock->sk;
399
400         if (sk == NULL)
401                 return -EINVAL;
402
403         /* Free mc lists */
404         ipv6_sock_mc_close(sk);
405
406         /* Free ac lists */
407         ipv6_sock_ac_close(sk);
408
409         return inet_release(sock);
410 }
411 EXPORT_SYMBOL(inet6_release);
412
413 void inet6_destroy_sock(struct sock *sk)
414 {
415         struct ipv6_pinfo *np = inet6_sk(sk);
416         struct sk_buff *skb;
417         struct ipv6_txoptions *opt;
418
419         /* Release rx options */
420
421         skb = xchg(&np->pktoptions, NULL);
422         if (skb != NULL)
423                 kfree_skb(skb);
424
425         skb = xchg(&np->rxpmtu, NULL);
426         if (skb != NULL)
427                 kfree_skb(skb);
428
429         /* Free flowlabels */
430         fl6_free_socklist(sk);
431
432         /* Free tx options */
433
434         opt = xchg(&np->opt, NULL);
435         if (opt != NULL)
436                 sock_kfree_s(sk, opt, opt->tot_len);
437 }
438 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
439
440 /*
441  *      This does both peername and sockname.
442  */
443
444 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
445                  int *uaddr_len, int peer)
446 {
447         struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
448         struct sock *sk = sock->sk;
449         struct inet_sock *inet = inet_sk(sk);
450         struct ipv6_pinfo *np = inet6_sk(sk);
451
452         sin->sin6_family = AF_INET6;
453         sin->sin6_flowinfo = 0;
454         sin->sin6_scope_id = 0;
455         if (peer) {
456                 if (!inet->inet_dport)
457                         return -ENOTCONN;
458                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
459                     peer == 1)
460                         return -ENOTCONN;
461                 sin->sin6_port = inet->inet_dport;
462                 sin->sin6_addr = np->daddr;
463                 if (np->sndflow)
464                         sin->sin6_flowinfo = np->flow_label;
465         } else {
466                 if (ipv6_addr_any(&np->rcv_saddr))
467                         sin->sin6_addr = np->saddr;
468                 else
469                         sin->sin6_addr = np->rcv_saddr;
470
471                 sin->sin6_port = inet->inet_sport;
472         }
473         sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
474                                                  sk->sk_bound_dev_if);
475         *uaddr_len = sizeof(*sin);
476         return 0;
477 }
478 EXPORT_SYMBOL(inet6_getname);
479
480 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
481 {
482         struct sock *sk = sock->sk;
483         struct net *net = sock_net(sk);
484
485         switch (cmd) {
486         case SIOCGSTAMP:
487                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
488
489         case SIOCGSTAMPNS:
490                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
491
492         case SIOCADDRT:
493         case SIOCDELRT:
494
495                 return ipv6_route_ioctl(net, cmd, (void __user *)arg);
496
497         case SIOCSIFADDR:
498                 return addrconf_add_ifaddr(net, (void __user *) arg);
499         case SIOCDIFADDR:
500                 return addrconf_del_ifaddr(net, (void __user *) arg);
501         case SIOCSIFDSTADDR:
502                 return addrconf_set_dstaddr(net, (void __user *) arg);
503         default:
504                 if (!sk->sk_prot->ioctl)
505                         return -ENOIOCTLCMD;
506                 return sk->sk_prot->ioctl(sk, cmd, arg);
507         }
508         /*NOTREACHED*/
509         return 0;
510 }
511 EXPORT_SYMBOL(inet6_ioctl);
512
513 const struct proto_ops inet6_stream_ops = {
514         .family            = PF_INET6,
515         .owner             = THIS_MODULE,
516         .release           = inet6_release,
517         .bind              = inet6_bind,
518         .connect           = inet_stream_connect,       /* ok           */
519         .socketpair        = sock_no_socketpair,        /* a do nothing */
520         .accept            = inet_accept,               /* ok           */
521         .getname           = inet6_getname,
522         .poll              = tcp_poll,                  /* ok           */
523         .ioctl             = inet6_ioctl,               /* must change  */
524         .listen            = inet_listen,               /* ok           */
525         .shutdown          = inet_shutdown,             /* ok           */
526         .setsockopt        = sock_common_setsockopt,    /* ok           */
527         .getsockopt        = sock_common_getsockopt,    /* ok           */
528         .sendmsg           = inet_sendmsg,              /* ok           */
529         .recvmsg           = inet_recvmsg,              /* ok           */
530         .mmap              = sock_no_mmap,
531         .sendpage          = inet_sendpage,
532         .splice_read       = tcp_splice_read,
533 #ifdef CONFIG_COMPAT
534         .compat_setsockopt = compat_sock_common_setsockopt,
535         .compat_getsockopt = compat_sock_common_getsockopt,
536 #endif
537 };
538
539 const struct proto_ops inet6_dgram_ops = {
540         .family            = PF_INET6,
541         .owner             = THIS_MODULE,
542         .release           = inet6_release,
543         .bind              = inet6_bind,
544         .connect           = inet_dgram_connect,        /* ok           */
545         .socketpair        = sock_no_socketpair,        /* a do nothing */
546         .accept            = sock_no_accept,            /* a do nothing */
547         .getname           = inet6_getname,
548         .poll              = udp_poll,                  /* ok           */
549         .ioctl             = inet6_ioctl,               /* must change  */
550         .listen            = sock_no_listen,            /* ok           */
551         .shutdown          = inet_shutdown,             /* ok           */
552         .setsockopt        = sock_common_setsockopt,    /* ok           */
553         .getsockopt        = sock_common_getsockopt,    /* ok           */
554         .sendmsg           = inet_sendmsg,              /* ok           */
555         .recvmsg           = inet_recvmsg,              /* ok           */
556         .mmap              = sock_no_mmap,
557         .sendpage          = sock_no_sendpage,
558 #ifdef CONFIG_COMPAT
559         .compat_setsockopt = compat_sock_common_setsockopt,
560         .compat_getsockopt = compat_sock_common_getsockopt,
561 #endif
562 };
563
564 static const struct net_proto_family inet6_family_ops = {
565         .family = PF_INET6,
566         .create = inet6_create,
567         .owner  = THIS_MODULE,
568 };
569
570 int inet6_register_protosw(struct inet_protosw *p)
571 {
572         struct list_head *lh;
573         struct inet_protosw *answer;
574         struct list_head *last_perm;
575         int protocol = p->protocol;
576         int ret;
577
578         spin_lock_bh(&inetsw6_lock);
579
580         ret = -EINVAL;
581         if (p->type >= SOCK_MAX)
582                 goto out_illegal;
583
584         /* If we are trying to override a permanent protocol, bail. */
585         answer = NULL;
586         ret = -EPERM;
587         last_perm = &inetsw6[p->type];
588         list_for_each(lh, &inetsw6[p->type]) {
589                 answer = list_entry(lh, struct inet_protosw, list);
590
591                 /* Check only the non-wild match. */
592                 if (INET_PROTOSW_PERMANENT & answer->flags) {
593                         if (protocol == answer->protocol)
594                                 break;
595                         last_perm = lh;
596                 }
597
598                 answer = NULL;
599         }
600         if (answer)
601                 goto out_permanent;
602
603         /* Add the new entry after the last permanent entry if any, so that
604          * the new entry does not override a permanent entry when matched with
605          * a wild-card protocol. But it is allowed to override any existing
606          * non-permanent entry.  This means that when we remove this entry, the
607          * system automatically returns to the old behavior.
608          */
609         list_add_rcu(&p->list, last_perm);
610         ret = 0;
611 out:
612         spin_unlock_bh(&inetsw6_lock);
613         return ret;
614
615 out_permanent:
616         pr_err("Attempt to override permanent protocol %d\n", protocol);
617         goto out;
618
619 out_illegal:
620         pr_err("Ignoring attempt to register invalid socket type %d\n",
621                p->type);
622         goto out;
623 }
624 EXPORT_SYMBOL(inet6_register_protosw);
625
626 void
627 inet6_unregister_protosw(struct inet_protosw *p)
628 {
629         if (INET_PROTOSW_PERMANENT & p->flags) {
630                 pr_err("Attempt to unregister permanent protocol %d\n",
631                        p->protocol);
632         } else {
633                 spin_lock_bh(&inetsw6_lock);
634                 list_del_rcu(&p->list);
635                 spin_unlock_bh(&inetsw6_lock);
636
637                 synchronize_net();
638         }
639 }
640 EXPORT_SYMBOL(inet6_unregister_protosw);
641
642 int inet6_sk_rebuild_header(struct sock *sk)
643 {
644         struct ipv6_pinfo *np = inet6_sk(sk);
645         struct dst_entry *dst;
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, final;
652                 struct flowi6 fl6;
653
654                 memset(&fl6, 0, sizeof(fl6));
655                 fl6.flowi6_proto = sk->sk_protocol;
656                 fl6.daddr = np->daddr;
657                 fl6.saddr = np->saddr;
658                 fl6.flowlabel = np->flow_label;
659                 fl6.flowi6_oif = sk->sk_bound_dev_if;
660                 fl6.flowi6_mark = sk->sk_mark;
661                 fl6.fl6_dport = inet->inet_dport;
662                 fl6.fl6_sport = inet->inet_sport;
663                 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
664
665                 final_p = fl6_update_dst(&fl6, np->opt, &final);
666
667                 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
668                 if (IS_ERR(dst)) {
669                         sk->sk_route_caps = 0;
670                         sk->sk_err_soft = -PTR_ERR(dst);
671                         return PTR_ERR(dst);
672                 }
673
674                 __ip6_dst_store(sk, dst, NULL, NULL);
675         }
676
677         return 0;
678 }
679 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
680
681 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb)
682 {
683         const struct ipv6_pinfo *np = inet6_sk(sk);
684         const struct inet6_skb_parm *opt = IP6CB(skb);
685
686         if (np->rxopt.all) {
687                 if ((opt->hop && (np->rxopt.bits.hopopts ||
688                                   np->rxopt.bits.ohopopts)) ||
689                     ((IPV6_FLOWINFO_MASK &
690                       *(__be32 *)skb_network_header(skb)) &&
691                      np->rxopt.bits.rxflow) ||
692                     (opt->srcrt && (np->rxopt.bits.srcrt ||
693                      np->rxopt.bits.osrcrt)) ||
694                     ((opt->dst1 || opt->dst0) &&
695                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
696                         return true;
697         }
698         return false;
699 }
700 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
701
702 static struct packet_type ipv6_packet_type __read_mostly = {
703         .type = cpu_to_be16(ETH_P_IPV6),
704         .func = ipv6_rcv,
705 };
706
707 static int __init ipv6_packet_init(void)
708 {
709         dev_add_pack(&ipv6_packet_type);
710         return 0;
711 }
712
713 static void ipv6_packet_cleanup(void)
714 {
715         dev_remove_pack(&ipv6_packet_type);
716 }
717
718 static int __net_init ipv6_init_mibs(struct net *net)
719 {
720         if (snmp_mib_init((void __percpu **)net->mib.udp_stats_in6,
721                           sizeof(struct udp_mib),
722                           __alignof__(struct udp_mib)) < 0)
723                 return -ENOMEM;
724         if (snmp_mib_init((void __percpu **)net->mib.udplite_stats_in6,
725                           sizeof(struct udp_mib),
726                           __alignof__(struct udp_mib)) < 0)
727                 goto err_udplite_mib;
728         if (snmp_mib_init((void __percpu **)net->mib.ipv6_statistics,
729                           sizeof(struct ipstats_mib),
730                           __alignof__(struct ipstats_mib)) < 0)
731                 goto err_ip_mib;
732         if (snmp_mib_init((void __percpu **)net->mib.icmpv6_statistics,
733                           sizeof(struct icmpv6_mib),
734                           __alignof__(struct icmpv6_mib)) < 0)
735                 goto err_icmp_mib;
736         net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
737                                                 GFP_KERNEL);
738         if (!net->mib.icmpv6msg_statistics)
739                 goto err_icmpmsg_mib;
740         return 0;
741
742 err_icmpmsg_mib:
743         snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics);
744 err_icmp_mib:
745         snmp_mib_free((void __percpu **)net->mib.ipv6_statistics);
746 err_ip_mib:
747         snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6);
748 err_udplite_mib:
749         snmp_mib_free((void __percpu **)net->mib.udp_stats_in6);
750         return -ENOMEM;
751 }
752
753 static void ipv6_cleanup_mibs(struct net *net)
754 {
755         snmp_mib_free((void __percpu **)net->mib.udp_stats_in6);
756         snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6);
757         snmp_mib_free((void __percpu **)net->mib.ipv6_statistics);
758         snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics);
759         kfree(net->mib.icmpv6msg_statistics);
760 }
761
762 static int __net_init inet6_net_init(struct net *net)
763 {
764         int err = 0;
765
766         net->ipv6.sysctl.bindv6only = 0;
767         net->ipv6.sysctl.icmpv6_time = 1*HZ;
768
769         err = ipv6_init_mibs(net);
770         if (err)
771                 return err;
772 #ifdef CONFIG_PROC_FS
773         err = udp6_proc_init(net);
774         if (err)
775                 goto out;
776         err = tcp6_proc_init(net);
777         if (err)
778                 goto proc_tcp6_fail;
779         err = ac6_proc_init(net);
780         if (err)
781                 goto proc_ac6_fail;
782 #endif
783         return err;
784
785 #ifdef CONFIG_PROC_FS
786 proc_ac6_fail:
787         tcp6_proc_exit(net);
788 proc_tcp6_fail:
789         udp6_proc_exit(net);
790 out:
791         ipv6_cleanup_mibs(net);
792         return err;
793 #endif
794 }
795
796 static void __net_exit inet6_net_exit(struct net *net)
797 {
798 #ifdef CONFIG_PROC_FS
799         udp6_proc_exit(net);
800         tcp6_proc_exit(net);
801         ac6_proc_exit(net);
802 #endif
803         ipv6_cleanup_mibs(net);
804 }
805
806 static struct pernet_operations inet6_net_ops = {
807         .init = inet6_net_init,
808         .exit = inet6_net_exit,
809 };
810
811 static int __init inet6_init(void)
812 {
813         struct list_head *r;
814         int err = 0;
815
816         BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > FIELD_SIZEOF(struct sk_buff, cb));
817
818         /* Register the socket-side information for inet6_create.  */
819         for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
820                 INIT_LIST_HEAD(r);
821
822         if (disable_ipv6_mod) {
823                 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
824                 goto out;
825         }
826
827         err = proto_register(&tcpv6_prot, 1);
828         if (err)
829                 goto out;
830
831         err = proto_register(&udpv6_prot, 1);
832         if (err)
833                 goto out_unregister_tcp_proto;
834
835         err = proto_register(&udplitev6_prot, 1);
836         if (err)
837                 goto out_unregister_udp_proto;
838
839         err = proto_register(&rawv6_prot, 1);
840         if (err)
841                 goto out_unregister_udplite_proto;
842
843
844         /* We MUST register RAW sockets before we create the ICMP6,
845          * IGMP6, or NDISC control sockets.
846          */
847         err = rawv6_init();
848         if (err)
849                 goto out_unregister_raw_proto;
850
851         /* Register the family here so that the init calls below will
852          * be able to create sockets. (?? is this dangerous ??)
853          */
854         err = sock_register(&inet6_family_ops);
855         if (err)
856                 goto out_sock_register_fail;
857
858         tcpv6_prot.sysctl_mem = init_net.ipv4.sysctl_tcp_mem;
859
860         /*
861          *      ipngwg API draft makes clear that the correct semantics
862          *      for TCP and UDP is to consider one TCP and UDP instance
863          *      in a host available by both INET and INET6 APIs and
864          *      able to communicate via both network protocols.
865          */
866
867         err = register_pernet_subsys(&inet6_net_ops);
868         if (err)
869                 goto register_pernet_fail;
870         err = icmpv6_init();
871         if (err)
872                 goto icmp_fail;
873         err = ip6_mr_init();
874         if (err)
875                 goto ipmr_fail;
876         err = ndisc_init();
877         if (err)
878                 goto ndisc_fail;
879         err = igmp6_init();
880         if (err)
881                 goto igmp_fail;
882         err = ipv6_netfilter_init();
883         if (err)
884                 goto netfilter_fail;
885         /* Create /proc/foo6 entries. */
886 #ifdef CONFIG_PROC_FS
887         err = -ENOMEM;
888         if (raw6_proc_init())
889                 goto proc_raw6_fail;
890         if (udplite6_proc_init())
891                 goto proc_udplite6_fail;
892         if (ipv6_misc_proc_init())
893                 goto proc_misc6_fail;
894         if (if6_proc_init())
895                 goto proc_if6_fail;
896 #endif
897         err = ip6_route_init();
898         if (err)
899                 goto ip6_route_fail;
900         err = ip6_flowlabel_init();
901         if (err)
902                 goto ip6_flowlabel_fail;
903         err = addrconf_init();
904         if (err)
905                 goto addrconf_fail;
906
907         /* Init v6 extension headers. */
908         err = ipv6_exthdrs_init();
909         if (err)
910                 goto ipv6_exthdrs_fail;
911
912         err = ipv6_frag_init();
913         if (err)
914                 goto ipv6_frag_fail;
915
916         /* Init v6 transport protocols. */
917         err = udpv6_init();
918         if (err)
919                 goto udpv6_fail;
920
921         err = udplitev6_init();
922         if (err)
923                 goto udplitev6_fail;
924
925         err = tcpv6_init();
926         if (err)
927                 goto tcpv6_fail;
928
929         err = ipv6_packet_init();
930         if (err)
931                 goto ipv6_packet_fail;
932
933 #ifdef CONFIG_SYSCTL
934         err = ipv6_sysctl_register();
935         if (err)
936                 goto sysctl_fail;
937 #endif
938 out:
939         return err;
940
941 #ifdef CONFIG_SYSCTL
942 sysctl_fail:
943         ipv6_packet_cleanup();
944 #endif
945 ipv6_packet_fail:
946         tcpv6_exit();
947 tcpv6_fail:
948         udplitev6_exit();
949 udplitev6_fail:
950         udpv6_exit();
951 udpv6_fail:
952         ipv6_frag_exit();
953 ipv6_frag_fail:
954         ipv6_exthdrs_exit();
955 ipv6_exthdrs_fail:
956         addrconf_cleanup();
957 addrconf_fail:
958         ip6_flowlabel_cleanup();
959 ip6_flowlabel_fail:
960         ip6_route_cleanup();
961 ip6_route_fail:
962 #ifdef CONFIG_PROC_FS
963         if6_proc_exit();
964 proc_if6_fail:
965         ipv6_misc_proc_exit();
966 proc_misc6_fail:
967         udplite6_proc_exit();
968 proc_udplite6_fail:
969         raw6_proc_exit();
970 proc_raw6_fail:
971 #endif
972         ipv6_netfilter_fini();
973 netfilter_fail:
974         igmp6_cleanup();
975 igmp_fail:
976         ndisc_cleanup();
977 ndisc_fail:
978         ip6_mr_cleanup();
979 ipmr_fail:
980         icmpv6_cleanup();
981 icmp_fail:
982         unregister_pernet_subsys(&inet6_net_ops);
983 register_pernet_fail:
984         sock_unregister(PF_INET6);
985         rtnl_unregister_all(PF_INET6);
986 out_sock_register_fail:
987         rawv6_exit();
988 out_unregister_raw_proto:
989         proto_unregister(&rawv6_prot);
990 out_unregister_udplite_proto:
991         proto_unregister(&udplitev6_prot);
992 out_unregister_udp_proto:
993         proto_unregister(&udpv6_prot);
994 out_unregister_tcp_proto:
995         proto_unregister(&tcpv6_prot);
996         goto out;
997 }
998 module_init(inet6_init);
999
1000 static void __exit inet6_exit(void)
1001 {
1002         if (disable_ipv6_mod)
1003                 return;
1004
1005         /* First of all disallow new sockets creation. */
1006         sock_unregister(PF_INET6);
1007         /* Disallow any further netlink messages */
1008         rtnl_unregister_all(PF_INET6);
1009
1010         udpv6_exit();
1011         udplitev6_exit();
1012         tcpv6_exit();
1013
1014         /* Cleanup code parts. */
1015         ipv6_packet_cleanup();
1016         ipv6_frag_exit();
1017         ipv6_exthdrs_exit();
1018         addrconf_cleanup();
1019         ip6_flowlabel_cleanup();
1020         ip6_route_cleanup();
1021 #ifdef CONFIG_PROC_FS
1022
1023         /* Cleanup code parts. */
1024         if6_proc_exit();
1025         ipv6_misc_proc_exit();
1026         udplite6_proc_exit();
1027         raw6_proc_exit();
1028 #endif
1029         ipv6_netfilter_fini();
1030         igmp6_cleanup();
1031         ndisc_cleanup();
1032         ip6_mr_cleanup();
1033         icmpv6_cleanup();
1034         rawv6_exit();
1035
1036         unregister_pernet_subsys(&inet6_net_ops);
1037         proto_unregister(&rawv6_prot);
1038         proto_unregister(&udplitev6_prot);
1039         proto_unregister(&udpv6_prot);
1040         proto_unregister(&tcpv6_prot);
1041
1042         rcu_barrier(); /* Wait for completion of call_rcu()'s */
1043 }
1044 module_exit(inet6_exit);
1045
1046 MODULE_ALIAS_NETPROTO(PF_INET6);