Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[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  *      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
22 #include <linux/module.h>
23 #include <linux/capability.h>
24 #include <linux/errno.h>
25 #include <linux/types.h>
26 #include <linux/socket.h>
27 #include <linux/in.h>
28 #include <linux/kernel.h>
29 #include <linux/timer.h>
30 #include <linux/string.h>
31 #include <linux/sockios.h>
32 #include <linux/net.h>
33 #include <linux/fcntl.h>
34 #include <linux/mm.h>
35 #include <linux/interrupt.h>
36 #include <linux/proc_fs.h>
37 #include <linux/stat.h>
38 #include <linux/init.h>
39
40 #include <linux/inet.h>
41 #include <linux/netdevice.h>
42 #include <linux/icmpv6.h>
43 #include <linux/netfilter_ipv6.h>
44
45 #include <net/ip.h>
46 #include <net/ipv6.h>
47 #include <net/udp.h>
48 #include <net/udplite.h>
49 #include <net/tcp.h>
50 #include <net/ipip.h>
51 #include <net/protocol.h>
52 #include <net/inet_common.h>
53 #include <net/route.h>
54 #include <net/transp_v6.h>
55 #include <net/ip6_route.h>
56 #include <net/addrconf.h>
57 #ifdef CONFIG_IPV6_TUNNEL
58 #include <net/ip6_tunnel.h>
59 #endif
60
61 #include <asm/uaccess.h>
62 #include <asm/system.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 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
76 {
77         const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
78
79         return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
80 }
81
82 static int inet6_create(struct net *net, struct socket *sock, int protocol)
83 {
84         struct inet_sock *inet;
85         struct ipv6_pinfo *np;
86         struct sock *sk;
87         struct inet_protosw *answer;
88         struct proto *answer_prot;
89         unsigned char answer_flags;
90         char answer_no_check;
91         int try_loading_module = 0;
92         int err;
93
94         if (sock->type != SOCK_RAW &&
95             sock->type != SOCK_DGRAM &&
96             !inet_ehash_secret)
97                 build_ehash_secret();
98
99         /* Look for the requested type/protocol pair. */
100 lookup_protocol:
101         err = -ESOCKTNOSUPPORT;
102         rcu_read_lock();
103         list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
104
105                 err = 0;
106                 /* Check the non-wild match. */
107                 if (protocol == answer->protocol) {
108                         if (protocol != IPPROTO_IP)
109                                 break;
110                 } else {
111                         /* Check for the two wild cases. */
112                         if (IPPROTO_IP == protocol) {
113                                 protocol = answer->protocol;
114                                 break;
115                         }
116                         if (IPPROTO_IP == answer->protocol)
117                                 break;
118                 }
119                 err = -EPROTONOSUPPORT;
120         }
121
122         if (err) {
123                 if (try_loading_module < 2) {
124                         rcu_read_unlock();
125                         /*
126                          * Be more specific, e.g. net-pf-10-proto-132-type-1
127                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
128                          */
129                         if (++try_loading_module == 1)
130                                 request_module("net-pf-%d-proto-%d-type-%d",
131                                                 PF_INET6, protocol, sock->type);
132                         /*
133                          * Fall back to generic, e.g. net-pf-10-proto-132
134                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
135                          */
136                         else
137                                 request_module("net-pf-%d-proto-%d",
138                                                 PF_INET6, protocol);
139                         goto lookup_protocol;
140                 } else
141                         goto out_rcu_unlock;
142         }
143
144         err = -EPERM;
145         if (answer->capability > 0 && !capable(answer->capability))
146                 goto out_rcu_unlock;
147
148         sock->ops = answer->ops;
149         answer_prot = answer->prot;
150         answer_no_check = answer->no_check;
151         answer_flags = answer->flags;
152         rcu_read_unlock();
153
154         WARN_ON(answer_prot->slab == NULL);
155
156         err = -ENOBUFS;
157         sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot);
158         if (sk == NULL)
159                 goto out;
160
161         sock_init_data(sock, sk);
162
163         err = 0;
164         sk->sk_no_check = answer_no_check;
165         if (INET_PROTOSW_REUSE & answer_flags)
166                 sk->sk_reuse = 1;
167
168         inet = inet_sk(sk);
169         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
170
171         if (SOCK_RAW == sock->type) {
172                 inet->num = protocol;
173                 if (IPPROTO_RAW == protocol)
174                         inet->hdrincl = 1;
175         }
176
177         sk->sk_destruct         = inet_sock_destruct;
178         sk->sk_family           = PF_INET6;
179         sk->sk_protocol         = protocol;
180
181         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
182
183         inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
184         np->hop_limit   = -1;
185         np->mcast_hops  = -1;
186         np->mc_loop     = 1;
187         np->pmtudisc    = IPV6_PMTUDISC_WANT;
188         np->ipv6only    = net->ipv6.sysctl.bindv6only;
189
190         /* Init the ipv4 part of the socket since we can have sockets
191          * using v6 API for ipv4.
192          */
193         inet->uc_ttl    = -1;
194
195         inet->mc_loop   = 1;
196         inet->mc_ttl    = 1;
197         inet->mc_index  = 0;
198         inet->mc_list   = NULL;
199
200         if (ipv4_config.no_pmtu_disc)
201                 inet->pmtudisc = IP_PMTUDISC_DONT;
202         else
203                 inet->pmtudisc = IP_PMTUDISC_WANT;
204         /*
205          * Increment only the relevant sk_prot->socks debug field, this changes
206          * the previous behaviour of incrementing both the equivalent to
207          * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
208          *
209          * This allows better debug granularity as we'll know exactly how many
210          * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
211          * transport protocol socks. -acme
212          */
213         sk_refcnt_debug_inc(sk);
214
215         if (inet->num) {
216                 /* It assumes that any protocol which allows
217                  * the user to assign a number at socket
218                  * creation time automatically shares.
219                  */
220                 inet->sport = htons(inet->num);
221                 sk->sk_prot->hash(sk);
222         }
223         if (sk->sk_prot->init) {
224                 err = sk->sk_prot->init(sk);
225                 if (err) {
226                         sk_common_release(sk);
227                         goto out;
228                 }
229         }
230 out:
231         return err;
232 out_rcu_unlock:
233         rcu_read_unlock();
234         goto out;
235 }
236
237
238 /* bind for INET6 API */
239 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
240 {
241         struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
242         struct sock *sk = sock->sk;
243         struct inet_sock *inet = inet_sk(sk);
244         struct ipv6_pinfo *np = inet6_sk(sk);
245         struct net *net = sock_net(sk);
246         __be32 v4addr = 0;
247         unsigned short snum;
248         int addr_type = 0;
249         int err = 0;
250
251         /* If the socket has its own bind function then use it. */
252         if (sk->sk_prot->bind)
253                 return sk->sk_prot->bind(sk, uaddr, addr_len);
254
255         if (addr_len < SIN6_LEN_RFC2133)
256                 return -EINVAL;
257         addr_type = ipv6_addr_type(&addr->sin6_addr);
258         if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
259                 return -EINVAL;
260
261         snum = ntohs(addr->sin6_port);
262         if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
263                 return -EACCES;
264
265         lock_sock(sk);
266
267         /* Check these errors (active socket, double bind). */
268         if (sk->sk_state != TCP_CLOSE || inet->num) {
269                 err = -EINVAL;
270                 goto out;
271         }
272
273         /* Check if the address belongs to the host. */
274         if (addr_type == IPV6_ADDR_MAPPED) {
275                 v4addr = addr->sin6_addr.s6_addr32[3];
276                 if (inet_addr_type(net, v4addr) != RTN_LOCAL) {
277                         err = -EADDRNOTAVAIL;
278                         goto out;
279                 }
280         } else {
281                 if (addr_type != IPV6_ADDR_ANY) {
282                         struct net_device *dev = NULL;
283
284                         if (addr_type & IPV6_ADDR_LINKLOCAL) {
285                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
286                                     addr->sin6_scope_id) {
287                                         /* Override any existing binding, if another one
288                                          * is supplied by user.
289                                          */
290                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
291                                 }
292
293                                 /* Binding to link-local address requires an interface */
294                                 if (!sk->sk_bound_dev_if) {
295                                         err = -EINVAL;
296                                         goto out;
297                                 }
298                                 dev = dev_get_by_index(net, sk->sk_bound_dev_if);
299                                 if (!dev) {
300                                         err = -ENODEV;
301                                         goto out;
302                                 }
303                         }
304
305                         /* ipv4 addr of the socket is invalid.  Only the
306                          * unspecified and mapped address have a v4 equivalent.
307                          */
308                         v4addr = LOOPBACK4_IPV6;
309                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
310                                 if (!ipv6_chk_addr(net, &addr->sin6_addr,
311                                                    dev, 0)) {
312                                         if (dev)
313                                                 dev_put(dev);
314                                         err = -EADDRNOTAVAIL;
315                                         goto out;
316                                 }
317                         }
318                         if (dev)
319                                 dev_put(dev);
320                 }
321         }
322
323         inet->rcv_saddr = v4addr;
324         inet->saddr = v4addr;
325
326         ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
327
328         if (!(addr_type & IPV6_ADDR_MULTICAST))
329                 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
330
331         /* Make sure we are allowed to bind here. */
332         if (sk->sk_prot->get_port(sk, snum)) {
333                 inet_reset_saddr(sk);
334                 err = -EADDRINUSE;
335                 goto out;
336         }
337
338         if (addr_type != IPV6_ADDR_ANY)
339                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
340         if (snum)
341                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
342         inet->sport = htons(inet->num);
343         inet->dport = 0;
344         inet->daddr = 0;
345 out:
346         release_sock(sk);
347         return err;
348 }
349
350 EXPORT_SYMBOL(inet6_bind);
351
352 int inet6_release(struct socket *sock)
353 {
354         struct sock *sk = sock->sk;
355
356         if (sk == NULL)
357                 return -EINVAL;
358
359         /* Free mc lists */
360         ipv6_sock_mc_close(sk);
361
362         /* Free ac lists */
363         ipv6_sock_ac_close(sk);
364
365         return inet_release(sock);
366 }
367
368 EXPORT_SYMBOL(inet6_release);
369
370 void inet6_destroy_sock(struct sock *sk)
371 {
372         struct ipv6_pinfo *np = inet6_sk(sk);
373         struct sk_buff *skb;
374         struct ipv6_txoptions *opt;
375
376         /* Release rx options */
377
378         if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
379                 kfree_skb(skb);
380
381         /* Free flowlabels */
382         fl6_free_socklist(sk);
383
384         /* Free tx options */
385
386         if ((opt = xchg(&np->opt, NULL)) != NULL)
387                 sock_kfree_s(sk, opt, opt->tot_len);
388 }
389
390 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
391
392 /*
393  *      This does both peername and sockname.
394  */
395
396 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
397                  int *uaddr_len, int peer)
398 {
399         struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
400         struct sock *sk = sock->sk;
401         struct inet_sock *inet = inet_sk(sk);
402         struct ipv6_pinfo *np = inet6_sk(sk);
403
404         sin->sin6_family = AF_INET6;
405         sin->sin6_flowinfo = 0;
406         sin->sin6_scope_id = 0;
407         if (peer) {
408                 if (!inet->dport)
409                         return -ENOTCONN;
410                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
411                     peer == 1)
412                         return -ENOTCONN;
413                 sin->sin6_port = inet->dport;
414                 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
415                 if (np->sndflow)
416                         sin->sin6_flowinfo = np->flow_label;
417         } else {
418                 if (ipv6_addr_any(&np->rcv_saddr))
419                         ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
420                 else
421                         ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
422
423                 sin->sin6_port = inet->sport;
424         }
425         if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
426                 sin->sin6_scope_id = sk->sk_bound_dev_if;
427         *uaddr_len = sizeof(*sin);
428         return(0);
429 }
430
431 EXPORT_SYMBOL(inet6_getname);
432
433 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
434 {
435         struct sock *sk = sock->sk;
436         struct net *net = sock_net(sk);
437
438         switch(cmd)
439         {
440         case SIOCGSTAMP:
441                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
442
443         case SIOCGSTAMPNS:
444                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
445
446         case SIOCADDRT:
447         case SIOCDELRT:
448
449                 return(ipv6_route_ioctl(net, cmd, (void __user *)arg));
450
451         case SIOCSIFADDR:
452                 return addrconf_add_ifaddr(net, (void __user *) arg);
453         case SIOCDIFADDR:
454                 return addrconf_del_ifaddr(net, (void __user *) arg);
455         case SIOCSIFDSTADDR:
456                 return addrconf_set_dstaddr(net, (void __user *) arg);
457         default:
458                 if (!sk->sk_prot->ioctl)
459                         return -ENOIOCTLCMD;
460                 return sk->sk_prot->ioctl(sk, cmd, arg);
461         }
462         /*NOTREACHED*/
463         return(0);
464 }
465
466 EXPORT_SYMBOL(inet6_ioctl);
467
468 const struct proto_ops inet6_stream_ops = {
469         .family            = PF_INET6,
470         .owner             = THIS_MODULE,
471         .release           = inet6_release,
472         .bind              = inet6_bind,
473         .connect           = inet_stream_connect,       /* ok           */
474         .socketpair        = sock_no_socketpair,        /* a do nothing */
475         .accept            = inet_accept,               /* ok           */
476         .getname           = inet6_getname,
477         .poll              = tcp_poll,                  /* ok           */
478         .ioctl             = inet6_ioctl,               /* must change  */
479         .listen            = inet_listen,               /* ok           */
480         .shutdown          = inet_shutdown,             /* ok           */
481         .setsockopt        = sock_common_setsockopt,    /* ok           */
482         .getsockopt        = sock_common_getsockopt,    /* ok           */
483         .sendmsg           = tcp_sendmsg,               /* ok           */
484         .recvmsg           = sock_common_recvmsg,       /* ok           */
485         .mmap              = sock_no_mmap,
486         .sendpage          = tcp_sendpage,
487         .splice_read       = tcp_splice_read,
488 #ifdef CONFIG_COMPAT
489         .compat_setsockopt = compat_sock_common_setsockopt,
490         .compat_getsockopt = compat_sock_common_getsockopt,
491 #endif
492 };
493
494 const struct proto_ops inet6_dgram_ops = {
495         .family            = PF_INET6,
496         .owner             = THIS_MODULE,
497         .release           = inet6_release,
498         .bind              = inet6_bind,
499         .connect           = inet_dgram_connect,        /* ok           */
500         .socketpair        = sock_no_socketpair,        /* a do nothing */
501         .accept            = sock_no_accept,            /* a do nothing */
502         .getname           = inet6_getname,
503         .poll              = udp_poll,                  /* ok           */
504         .ioctl             = inet6_ioctl,               /* must change  */
505         .listen            = sock_no_listen,            /* ok           */
506         .shutdown          = inet_shutdown,             /* ok           */
507         .setsockopt        = sock_common_setsockopt,    /* ok           */
508         .getsockopt        = sock_common_getsockopt,    /* ok           */
509         .sendmsg           = inet_sendmsg,              /* ok           */
510         .recvmsg           = sock_common_recvmsg,       /* ok           */
511         .mmap              = sock_no_mmap,
512         .sendpage          = sock_no_sendpage,
513 #ifdef CONFIG_COMPAT
514         .compat_setsockopt = compat_sock_common_setsockopt,
515         .compat_getsockopt = compat_sock_common_getsockopt,
516 #endif
517 };
518
519 static struct net_proto_family inet6_family_ops = {
520         .family = PF_INET6,
521         .create = inet6_create,
522         .owner  = THIS_MODULE,
523 };
524
525 int inet6_register_protosw(struct inet_protosw *p)
526 {
527         struct list_head *lh;
528         struct inet_protosw *answer;
529         struct list_head *last_perm;
530         int protocol = p->protocol;
531         int ret;
532
533         spin_lock_bh(&inetsw6_lock);
534
535         ret = -EINVAL;
536         if (p->type >= SOCK_MAX)
537                 goto out_illegal;
538
539         /* If we are trying to override a permanent protocol, bail. */
540         answer = NULL;
541         ret = -EPERM;
542         last_perm = &inetsw6[p->type];
543         list_for_each(lh, &inetsw6[p->type]) {
544                 answer = list_entry(lh, struct inet_protosw, list);
545
546                 /* Check only the non-wild match. */
547                 if (INET_PROTOSW_PERMANENT & answer->flags) {
548                         if (protocol == answer->protocol)
549                                 break;
550                         last_perm = lh;
551                 }
552
553                 answer = NULL;
554         }
555         if (answer)
556                 goto out_permanent;
557
558         /* Add the new entry after the last permanent entry if any, so that
559          * the new entry does not override a permanent entry when matched with
560          * a wild-card protocol. But it is allowed to override any existing
561          * non-permanent entry.  This means that when we remove this entry, the
562          * system automatically returns to the old behavior.
563          */
564         list_add_rcu(&p->list, last_perm);
565         ret = 0;
566 out:
567         spin_unlock_bh(&inetsw6_lock);
568         return ret;
569
570 out_permanent:
571         printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
572                protocol);
573         goto out;
574
575 out_illegal:
576         printk(KERN_ERR
577                "Ignoring attempt to register invalid socket type %d.\n",
578                p->type);
579         goto out;
580 }
581
582 EXPORT_SYMBOL(inet6_register_protosw);
583
584 void
585 inet6_unregister_protosw(struct inet_protosw *p)
586 {
587         if (INET_PROTOSW_PERMANENT & p->flags) {
588                 printk(KERN_ERR
589                        "Attempt to unregister permanent protocol %d.\n",
590                        p->protocol);
591         } else {
592                 spin_lock_bh(&inetsw6_lock);
593                 list_del_rcu(&p->list);
594                 spin_unlock_bh(&inetsw6_lock);
595
596                 synchronize_net();
597         }
598 }
599
600 EXPORT_SYMBOL(inet6_unregister_protosw);
601
602 int inet6_sk_rebuild_header(struct sock *sk)
603 {
604         int err;
605         struct dst_entry *dst;
606         struct ipv6_pinfo *np = inet6_sk(sk);
607
608         dst = __sk_dst_check(sk, np->dst_cookie);
609
610         if (dst == NULL) {
611                 struct inet_sock *inet = inet_sk(sk);
612                 struct in6_addr *final_p = NULL, final;
613                 struct flowi fl;
614
615                 memset(&fl, 0, sizeof(fl));
616                 fl.proto = sk->sk_protocol;
617                 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
618                 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
619                 fl.fl6_flowlabel = np->flow_label;
620                 fl.oif = sk->sk_bound_dev_if;
621                 fl.fl_ip_dport = inet->dport;
622                 fl.fl_ip_sport = inet->sport;
623                 security_sk_classify_flow(sk, &fl);
624
625                 if (np->opt && np->opt->srcrt) {
626                         struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
627                         ipv6_addr_copy(&final, &fl.fl6_dst);
628                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
629                         final_p = &final;
630                 }
631
632                 err = ip6_dst_lookup(sk, &dst, &fl);
633                 if (err) {
634                         sk->sk_route_caps = 0;
635                         return err;
636                 }
637                 if (final_p)
638                         ipv6_addr_copy(&fl.fl6_dst, final_p);
639
640                 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
641                         sk->sk_err_soft = -err;
642                         return err;
643                 }
644
645                 __ip6_dst_store(sk, dst, NULL, NULL);
646         }
647
648         return 0;
649 }
650
651 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
652
653 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
654 {
655         struct ipv6_pinfo *np = inet6_sk(sk);
656         struct inet6_skb_parm *opt = IP6CB(skb);
657
658         if (np->rxopt.all) {
659                 if ((opt->hop && (np->rxopt.bits.hopopts ||
660                                   np->rxopt.bits.ohopopts)) ||
661                     ((IPV6_FLOWINFO_MASK &
662                       *(__be32 *)skb_network_header(skb)) &&
663                      np->rxopt.bits.rxflow) ||
664                     (opt->srcrt && (np->rxopt.bits.srcrt ||
665                      np->rxopt.bits.osrcrt)) ||
666                     ((opt->dst1 || opt->dst0) &&
667                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
668                         return 1;
669         }
670         return 0;
671 }
672
673 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
674
675 static struct inet6_protocol *ipv6_gso_pull_exthdrs(struct sk_buff *skb,
676                                                     int proto)
677 {
678         struct inet6_protocol *ops = NULL;
679
680         for (;;) {
681                 struct ipv6_opt_hdr *opth;
682                 int len;
683
684                 if (proto != NEXTHDR_HOP) {
685                         ops = rcu_dereference(inet6_protos[proto]);
686
687                         if (unlikely(!ops))
688                                 break;
689
690                         if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
691                                 break;
692                 }
693
694                 if (unlikely(!pskb_may_pull(skb, 8)))
695                         break;
696
697                 opth = (void *)skb->data;
698                 len = ipv6_optlen(opth);
699
700                 if (unlikely(!pskb_may_pull(skb, len)))
701                         break;
702
703                 proto = opth->nexthdr;
704                 __skb_pull(skb, len);
705         }
706
707         return ops;
708 }
709
710 static int ipv6_gso_send_check(struct sk_buff *skb)
711 {
712         struct ipv6hdr *ipv6h;
713         struct inet6_protocol *ops;
714         int err = -EINVAL;
715
716         if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
717                 goto out;
718
719         ipv6h = ipv6_hdr(skb);
720         __skb_pull(skb, sizeof(*ipv6h));
721         err = -EPROTONOSUPPORT;
722
723         rcu_read_lock();
724         ops = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
725         if (likely(ops && ops->gso_send_check)) {
726                 skb_reset_transport_header(skb);
727                 err = ops->gso_send_check(skb);
728         }
729         rcu_read_unlock();
730
731 out:
732         return err;
733 }
734
735 static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features)
736 {
737         struct sk_buff *segs = ERR_PTR(-EINVAL);
738         struct ipv6hdr *ipv6h;
739         struct inet6_protocol *ops;
740
741         if (!(features & NETIF_F_V6_CSUM))
742                 features &= ~NETIF_F_SG;
743
744         if (unlikely(skb_shinfo(skb)->gso_type &
745                      ~(SKB_GSO_UDP |
746                        SKB_GSO_DODGY |
747                        SKB_GSO_TCP_ECN |
748                        SKB_GSO_TCPV6 |
749                        0)))
750                 goto out;
751
752         if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
753                 goto out;
754
755         ipv6h = ipv6_hdr(skb);
756         __skb_pull(skb, sizeof(*ipv6h));
757         segs = ERR_PTR(-EPROTONOSUPPORT);
758
759         rcu_read_lock();
760         ops = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
761         if (likely(ops && ops->gso_segment)) {
762                 skb_reset_transport_header(skb);
763                 segs = ops->gso_segment(skb, features);
764         }
765         rcu_read_unlock();
766
767         if (unlikely(IS_ERR(segs)))
768                 goto out;
769
770         for (skb = segs; skb; skb = skb->next) {
771                 ipv6h = ipv6_hdr(skb);
772                 ipv6h->payload_len = htons(skb->len - skb->mac_len -
773                                            sizeof(*ipv6h));
774         }
775
776 out:
777         return segs;
778 }
779
780 static struct packet_type ipv6_packet_type = {
781         .type = __constant_htons(ETH_P_IPV6),
782         .func = ipv6_rcv,
783         .gso_send_check = ipv6_gso_send_check,
784         .gso_segment = ipv6_gso_segment,
785 };
786
787 static int __init ipv6_packet_init(void)
788 {
789         dev_add_pack(&ipv6_packet_type);
790         return 0;
791 }
792
793 static void ipv6_packet_cleanup(void)
794 {
795         dev_remove_pack(&ipv6_packet_type);
796 }
797
798 static int __net_init ipv6_init_mibs(struct net *net)
799 {
800         if (snmp_mib_init((void **)net->mib.udp_stats_in6,
801                           sizeof (struct udp_mib)) < 0)
802                 return -ENOMEM;
803         if (snmp_mib_init((void **)net->mib.udplite_stats_in6,
804                           sizeof (struct udp_mib)) < 0)
805                 goto err_udplite_mib;
806         if (snmp_mib_init((void **)net->mib.ipv6_statistics,
807                           sizeof(struct ipstats_mib)) < 0)
808                 goto err_ip_mib;
809         if (snmp_mib_init((void **)net->mib.icmpv6_statistics,
810                           sizeof(struct icmpv6_mib)) < 0)
811                 goto err_icmp_mib;
812         if (snmp_mib_init((void **)net->mib.icmpv6msg_statistics,
813                           sizeof(struct icmpv6msg_mib)) < 0)
814                 goto err_icmpmsg_mib;
815         return 0;
816
817 err_icmpmsg_mib:
818         snmp_mib_free((void **)net->mib.icmpv6_statistics);
819 err_icmp_mib:
820         snmp_mib_free((void **)net->mib.ipv6_statistics);
821 err_ip_mib:
822         snmp_mib_free((void **)net->mib.udplite_stats_in6);
823 err_udplite_mib:
824         snmp_mib_free((void **)net->mib.udp_stats_in6);
825         return -ENOMEM;
826 }
827
828 static void __net_exit ipv6_cleanup_mibs(struct net *net)
829 {
830         snmp_mib_free((void **)net->mib.udp_stats_in6);
831         snmp_mib_free((void **)net->mib.udplite_stats_in6);
832         snmp_mib_free((void **)net->mib.ipv6_statistics);
833         snmp_mib_free((void **)net->mib.icmpv6_statistics);
834         snmp_mib_free((void **)net->mib.icmpv6msg_statistics);
835 }
836
837 static int __net_init inet6_net_init(struct net *net)
838 {
839         int err = 0;
840
841         net->ipv6.sysctl.bindv6only = 0;
842         net->ipv6.sysctl.icmpv6_time = 1*HZ;
843
844         err = ipv6_init_mibs(net);
845         if (err)
846                 return err;
847 #ifdef CONFIG_PROC_FS
848         err = udp6_proc_init(net);
849         if (err)
850                 goto out;
851         err = tcp6_proc_init(net);
852         if (err)
853                 goto proc_tcp6_fail;
854         err = ac6_proc_init(net);
855         if (err)
856                 goto proc_ac6_fail;
857 #endif
858         return err;
859
860 #ifdef CONFIG_PROC_FS
861 proc_ac6_fail:
862         tcp6_proc_exit(net);
863 proc_tcp6_fail:
864         udp6_proc_exit(net);
865 out:
866         ipv6_cleanup_mibs(net);
867         return err;
868 #endif
869 }
870
871 static void inet6_net_exit(struct net *net)
872 {
873 #ifdef CONFIG_PROC_FS
874         udp6_proc_exit(net);
875         tcp6_proc_exit(net);
876         ac6_proc_exit(net);
877 #endif
878         ipv6_cleanup_mibs(net);
879 }
880
881 static struct pernet_operations inet6_net_ops = {
882         .init = inet6_net_init,
883         .exit = inet6_net_exit,
884 };
885
886 static int __init inet6_init(void)
887 {
888         struct sk_buff *dummy_skb;
889         struct list_head *r;
890         int err;
891
892         BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
893
894         err = proto_register(&tcpv6_prot, 1);
895         if (err)
896                 goto out;
897
898         err = proto_register(&udpv6_prot, 1);
899         if (err)
900                 goto out_unregister_tcp_proto;
901
902         err = proto_register(&udplitev6_prot, 1);
903         if (err)
904                 goto out_unregister_udp_proto;
905
906         err = proto_register(&rawv6_prot, 1);
907         if (err)
908                 goto out_unregister_udplite_proto;
909
910
911         /* Register the socket-side information for inet6_create.  */
912         for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
913                 INIT_LIST_HEAD(r);
914
915         /* We MUST register RAW sockets before we create the ICMP6,
916          * IGMP6, or NDISC control sockets.
917          */
918         err = rawv6_init();
919         if (err)
920                 goto out_unregister_raw_proto;
921
922         /* Register the family here so that the init calls below will
923          * be able to create sockets. (?? is this dangerous ??)
924          */
925         err = sock_register(&inet6_family_ops);
926         if (err)
927                 goto out_sock_register_fail;
928
929 #ifdef CONFIG_SYSCTL
930         err = ipv6_static_sysctl_register();
931         if (err)
932                 goto static_sysctl_fail;
933 #endif
934         /*
935          *      ipngwg API draft makes clear that the correct semantics
936          *      for TCP and UDP is to consider one TCP and UDP instance
937          *      in a host availiable by both INET and INET6 APIs and
938          *      able to communicate via both network protocols.
939          */
940
941         err = register_pernet_subsys(&inet6_net_ops);
942         if (err)
943                 goto register_pernet_fail;
944         err = icmpv6_init();
945         if (err)
946                 goto icmp_fail;
947         err = ip6_mr_init();
948         if (err)
949                 goto ipmr_fail;
950         err = ndisc_init();
951         if (err)
952                 goto ndisc_fail;
953         err = igmp6_init();
954         if (err)
955                 goto igmp_fail;
956         err = ipv6_netfilter_init();
957         if (err)
958                 goto netfilter_fail;
959         /* Create /proc/foo6 entries. */
960 #ifdef CONFIG_PROC_FS
961         err = -ENOMEM;
962         if (raw6_proc_init())
963                 goto proc_raw6_fail;
964         if (udplite6_proc_init())
965                 goto proc_udplite6_fail;
966         if (ipv6_misc_proc_init())
967                 goto proc_misc6_fail;
968         if (if6_proc_init())
969                 goto proc_if6_fail;
970 #endif
971         err = ip6_route_init();
972         if (err)
973                 goto ip6_route_fail;
974         err = ip6_flowlabel_init();
975         if (err)
976                 goto ip6_flowlabel_fail;
977         err = addrconf_init();
978         if (err)
979                 goto addrconf_fail;
980
981         /* Init v6 extension headers. */
982         err = ipv6_exthdrs_init();
983         if (err)
984                 goto ipv6_exthdrs_fail;
985
986         err = ipv6_frag_init();
987         if (err)
988                 goto ipv6_frag_fail;
989
990         /* Init v6 transport protocols. */
991         err = udpv6_init();
992         if (err)
993                 goto udpv6_fail;
994
995         err = udplitev6_init();
996         if (err)
997                 goto udplitev6_fail;
998
999         err = tcpv6_init();
1000         if (err)
1001                 goto tcpv6_fail;
1002
1003         err = ipv6_packet_init();
1004         if (err)
1005                 goto ipv6_packet_fail;
1006
1007 #ifdef CONFIG_SYSCTL
1008         err = ipv6_sysctl_register();
1009         if (err)
1010                 goto sysctl_fail;
1011 #endif
1012 out:
1013         return err;
1014
1015 #ifdef CONFIG_SYSCTL
1016 sysctl_fail:
1017         ipv6_packet_cleanup();
1018 #endif
1019 ipv6_packet_fail:
1020         tcpv6_exit();
1021 tcpv6_fail:
1022         udplitev6_exit();
1023 udplitev6_fail:
1024         udpv6_exit();
1025 udpv6_fail:
1026         ipv6_frag_exit();
1027 ipv6_frag_fail:
1028         ipv6_exthdrs_exit();
1029 ipv6_exthdrs_fail:
1030         addrconf_cleanup();
1031 addrconf_fail:
1032         ip6_flowlabel_cleanup();
1033 ip6_flowlabel_fail:
1034         ip6_route_cleanup();
1035 ip6_route_fail:
1036 #ifdef CONFIG_PROC_FS
1037         if6_proc_exit();
1038 proc_if6_fail:
1039         ipv6_misc_proc_exit();
1040 proc_misc6_fail:
1041         udplite6_proc_exit();
1042 proc_udplite6_fail:
1043         raw6_proc_exit();
1044 proc_raw6_fail:
1045 #endif
1046         ipv6_netfilter_fini();
1047 netfilter_fail:
1048         igmp6_cleanup();
1049 igmp_fail:
1050         ndisc_cleanup();
1051 ndisc_fail:
1052         ip6_mr_cleanup();
1053 ipmr_fail:
1054         icmpv6_cleanup();
1055 icmp_fail:
1056         unregister_pernet_subsys(&inet6_net_ops);
1057 register_pernet_fail:
1058 #ifdef CONFIG_SYSCTL
1059         ipv6_static_sysctl_unregister();
1060 static_sysctl_fail:
1061 #endif
1062         sock_unregister(PF_INET6);
1063         rtnl_unregister_all(PF_INET6);
1064 out_sock_register_fail:
1065         rawv6_exit();
1066 out_unregister_raw_proto:
1067         proto_unregister(&rawv6_prot);
1068 out_unregister_udplite_proto:
1069         proto_unregister(&udplitev6_prot);
1070 out_unregister_udp_proto:
1071         proto_unregister(&udpv6_prot);
1072 out_unregister_tcp_proto:
1073         proto_unregister(&tcpv6_prot);
1074         goto out;
1075 }
1076 module_init(inet6_init);
1077
1078 static void __exit inet6_exit(void)
1079 {
1080         /* First of all disallow new sockets creation. */
1081         sock_unregister(PF_INET6);
1082         /* Disallow any further netlink messages */
1083         rtnl_unregister_all(PF_INET6);
1084
1085 #ifdef CONFIG_SYSCTL
1086         ipv6_sysctl_unregister();
1087 #endif
1088         udpv6_exit();
1089         udplitev6_exit();
1090         tcpv6_exit();
1091
1092         /* Cleanup code parts. */
1093         ipv6_packet_cleanup();
1094         ipv6_frag_exit();
1095         ipv6_exthdrs_exit();
1096         addrconf_cleanup();
1097         ip6_flowlabel_cleanup();
1098         ip6_route_cleanup();
1099 #ifdef CONFIG_PROC_FS
1100
1101         /* Cleanup code parts. */
1102         if6_proc_exit();
1103         ipv6_misc_proc_exit();
1104         udplite6_proc_exit();
1105         raw6_proc_exit();
1106 #endif
1107         ipv6_netfilter_fini();
1108         igmp6_cleanup();
1109         ndisc_cleanup();
1110         ip6_mr_cleanup();
1111         icmpv6_cleanup();
1112         rawv6_exit();
1113
1114         unregister_pernet_subsys(&inet6_net_ops);
1115 #ifdef CONFIG_SYSCTL
1116         ipv6_static_sysctl_unregister();
1117 #endif
1118         proto_unregister(&rawv6_prot);
1119         proto_unregister(&udplitev6_prot);
1120         proto_unregister(&udpv6_prot);
1121         proto_unregister(&tcpv6_prot);
1122 }
1123 module_exit(inet6_exit);
1124
1125 MODULE_ALIAS_NETPROTO(PF_INET6);