Merge branch 'topic/jack-free-fix' into topic/hda
[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 int disable_ipv6 = 0;
76 module_param_named(disable, disable_ipv6, int, 0);
77 MODULE_PARM_DESC(disable, "Disable IPv6 such that it is non-functional");
78
79 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
80 {
81         const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
82
83         return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
84 }
85
86 static int inet6_create(struct net *net, struct socket *sock, int protocol)
87 {
88         struct inet_sock *inet;
89         struct ipv6_pinfo *np;
90         struct sock *sk;
91         struct inet_protosw *answer;
92         struct proto *answer_prot;
93         unsigned char answer_flags;
94         char answer_no_check;
95         int try_loading_module = 0;
96         int err;
97
98         if (sock->type != SOCK_RAW &&
99             sock->type != SOCK_DGRAM &&
100             !inet_ehash_secret)
101                 build_ehash_secret();
102
103         /* Look for the requested type/protocol pair. */
104 lookup_protocol:
105         err = -ESOCKTNOSUPPORT;
106         rcu_read_lock();
107         list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
108
109                 err = 0;
110                 /* Check the non-wild match. */
111                 if (protocol == answer->protocol) {
112                         if (protocol != IPPROTO_IP)
113                                 break;
114                 } else {
115                         /* Check for the two wild cases. */
116                         if (IPPROTO_IP == protocol) {
117                                 protocol = answer->protocol;
118                                 break;
119                         }
120                         if (IPPROTO_IP == answer->protocol)
121                                 break;
122                 }
123                 err = -EPROTONOSUPPORT;
124         }
125
126         if (err) {
127                 if (try_loading_module < 2) {
128                         rcu_read_unlock();
129                         /*
130                          * Be more specific, e.g. net-pf-10-proto-132-type-1
131                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
132                          */
133                         if (++try_loading_module == 1)
134                                 request_module("net-pf-%d-proto-%d-type-%d",
135                                                 PF_INET6, protocol, sock->type);
136                         /*
137                          * Fall back to generic, e.g. net-pf-10-proto-132
138                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
139                          */
140                         else
141                                 request_module("net-pf-%d-proto-%d",
142                                                 PF_INET6, protocol);
143                         goto lookup_protocol;
144                 } else
145                         goto out_rcu_unlock;
146         }
147
148         err = -EPERM;
149         if (answer->capability > 0 && !capable(answer->capability))
150                 goto out_rcu_unlock;
151
152         sock->ops = answer->ops;
153         answer_prot = answer->prot;
154         answer_no_check = answer->no_check;
155         answer_flags = answer->flags;
156         rcu_read_unlock();
157
158         WARN_ON(answer_prot->slab == NULL);
159
160         err = -ENOBUFS;
161         sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot);
162         if (sk == NULL)
163                 goto out;
164
165         sock_init_data(sock, sk);
166
167         err = 0;
168         sk->sk_no_check = answer_no_check;
169         if (INET_PROTOSW_REUSE & answer_flags)
170                 sk->sk_reuse = 1;
171
172         inet = inet_sk(sk);
173         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
174
175         if (SOCK_RAW == sock->type) {
176                 inet->num = protocol;
177                 if (IPPROTO_RAW == protocol)
178                         inet->hdrincl = 1;
179         }
180
181         sk->sk_destruct         = inet_sock_destruct;
182         sk->sk_family           = PF_INET6;
183         sk->sk_protocol         = protocol;
184
185         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
186
187         inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
188         np->hop_limit   = -1;
189         np->mcast_hops  = -1;
190         np->mc_loop     = 1;
191         np->pmtudisc    = IPV6_PMTUDISC_WANT;
192         np->ipv6only    = net->ipv6.sysctl.bindv6only;
193
194         /* Init the ipv4 part of the socket since we can have sockets
195          * using v6 API for ipv4.
196          */
197         inet->uc_ttl    = -1;
198
199         inet->mc_loop   = 1;
200         inet->mc_ttl    = 1;
201         inet->mc_index  = 0;
202         inet->mc_list   = NULL;
203
204         if (ipv4_config.no_pmtu_disc)
205                 inet->pmtudisc = IP_PMTUDISC_DONT;
206         else
207                 inet->pmtudisc = IP_PMTUDISC_WANT;
208         /*
209          * Increment only the relevant sk_prot->socks debug field, this changes
210          * the previous behaviour of incrementing both the equivalent to
211          * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
212          *
213          * This allows better debug granularity as we'll know exactly how many
214          * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
215          * transport protocol socks. -acme
216          */
217         sk_refcnt_debug_inc(sk);
218
219         if (inet->num) {
220                 /* It assumes that any protocol which allows
221                  * the user to assign a number at socket
222                  * creation time automatically shares.
223                  */
224                 inet->sport = htons(inet->num);
225                 sk->sk_prot->hash(sk);
226         }
227         if (sk->sk_prot->init) {
228                 err = sk->sk_prot->init(sk);
229                 if (err) {
230                         sk_common_release(sk);
231                         goto out;
232                 }
233         }
234 out:
235         return err;
236 out_rcu_unlock:
237         rcu_read_unlock();
238         goto out;
239 }
240
241
242 /* bind for INET6 API */
243 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
244 {
245         struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
246         struct sock *sk = sock->sk;
247         struct inet_sock *inet = inet_sk(sk);
248         struct ipv6_pinfo *np = inet6_sk(sk);
249         struct net *net = sock_net(sk);
250         __be32 v4addr = 0;
251         unsigned short snum;
252         int addr_type = 0;
253         int err = 0;
254
255         /* If the socket has its own bind function then use it. */
256         if (sk->sk_prot->bind)
257                 return sk->sk_prot->bind(sk, uaddr, addr_len);
258
259         if (addr_len < SIN6_LEN_RFC2133)
260                 return -EINVAL;
261         addr_type = ipv6_addr_type(&addr->sin6_addr);
262         if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
263                 return -EINVAL;
264
265         snum = ntohs(addr->sin6_port);
266         if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
267                 return -EACCES;
268
269         lock_sock(sk);
270
271         /* Check these errors (active socket, double bind). */
272         if (sk->sk_state != TCP_CLOSE || inet->num) {
273                 err = -EINVAL;
274                 goto out;
275         }
276
277         /* Check if the address belongs to the host. */
278         if (addr_type == IPV6_ADDR_MAPPED) {
279                 int chk_addr_ret;
280
281                 /* Binding to v4-mapped address on a v6-only socket
282                  * makes no sense
283                  */
284                 if (np->ipv6only) {
285                         err = -EINVAL;
286                         goto out;
287                 }
288
289                 /* Reproduce AF_INET checks to make the bindings consitant */
290                 v4addr = addr->sin6_addr.s6_addr32[3];
291                 chk_addr_ret = inet_addr_type(net, v4addr);
292                 if (!sysctl_ip_nonlocal_bind &&
293                     !(inet->freebind || inet->transparent) &&
294                     v4addr != htonl(INADDR_ANY) &&
295                     chk_addr_ret != RTN_LOCAL &&
296                     chk_addr_ret != RTN_MULTICAST &&
297                     chk_addr_ret != RTN_BROADCAST)
298                         goto out;
299         } else {
300                 if (addr_type != IPV6_ADDR_ANY) {
301                         struct net_device *dev = NULL;
302
303                         if (addr_type & IPV6_ADDR_LINKLOCAL) {
304                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
305                                     addr->sin6_scope_id) {
306                                         /* Override any existing binding, if another one
307                                          * is supplied by user.
308                                          */
309                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
310                                 }
311
312                                 /* Binding to link-local address requires an interface */
313                                 if (!sk->sk_bound_dev_if) {
314                                         err = -EINVAL;
315                                         goto out;
316                                 }
317                                 dev = dev_get_by_index(net, sk->sk_bound_dev_if);
318                                 if (!dev) {
319                                         err = -ENODEV;
320                                         goto out;
321                                 }
322                         }
323
324                         /* ipv4 addr of the socket is invalid.  Only the
325                          * unspecified and mapped address have a v4 equivalent.
326                          */
327                         v4addr = LOOPBACK4_IPV6;
328                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
329                                 if (!ipv6_chk_addr(net, &addr->sin6_addr,
330                                                    dev, 0)) {
331                                         if (dev)
332                                                 dev_put(dev);
333                                         err = -EADDRNOTAVAIL;
334                                         goto out;
335                                 }
336                         }
337                         if (dev)
338                                 dev_put(dev);
339                 }
340         }
341
342         inet->rcv_saddr = v4addr;
343         inet->saddr = v4addr;
344
345         ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
346
347         if (!(addr_type & IPV6_ADDR_MULTICAST))
348                 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
349
350         /* Make sure we are allowed to bind here. */
351         if (sk->sk_prot->get_port(sk, snum)) {
352                 inet_reset_saddr(sk);
353                 err = -EADDRINUSE;
354                 goto out;
355         }
356
357         if (addr_type != IPV6_ADDR_ANY) {
358                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
359                 if (addr_type != IPV6_ADDR_MAPPED)
360                         np->ipv6only = 1;
361         }
362         if (snum)
363                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
364         inet->sport = htons(inet->num);
365         inet->dport = 0;
366         inet->daddr = 0;
367 out:
368         release_sock(sk);
369         return err;
370 }
371
372 EXPORT_SYMBOL(inet6_bind);
373
374 int inet6_release(struct socket *sock)
375 {
376         struct sock *sk = sock->sk;
377
378         if (sk == NULL)
379                 return -EINVAL;
380
381         /* Free mc lists */
382         ipv6_sock_mc_close(sk);
383
384         /* Free ac lists */
385         ipv6_sock_ac_close(sk);
386
387         return inet_release(sock);
388 }
389
390 EXPORT_SYMBOL(inet6_release);
391
392 void inet6_destroy_sock(struct sock *sk)
393 {
394         struct ipv6_pinfo *np = inet6_sk(sk);
395         struct sk_buff *skb;
396         struct ipv6_txoptions *opt;
397
398         /* Release rx options */
399
400         if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
401                 kfree_skb(skb);
402
403         /* Free flowlabels */
404         fl6_free_socklist(sk);
405
406         /* Free tx options */
407
408         if ((opt = xchg(&np->opt, NULL)) != NULL)
409                 sock_kfree_s(sk, opt, opt->tot_len);
410 }
411
412 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
413
414 /*
415  *      This does both peername and sockname.
416  */
417
418 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
419                  int *uaddr_len, int peer)
420 {
421         struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
422         struct sock *sk = sock->sk;
423         struct inet_sock *inet = inet_sk(sk);
424         struct ipv6_pinfo *np = inet6_sk(sk);
425
426         sin->sin6_family = AF_INET6;
427         sin->sin6_flowinfo = 0;
428         sin->sin6_scope_id = 0;
429         if (peer) {
430                 if (!inet->dport)
431                         return -ENOTCONN;
432                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
433                     peer == 1)
434                         return -ENOTCONN;
435                 sin->sin6_port = inet->dport;
436                 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
437                 if (np->sndflow)
438                         sin->sin6_flowinfo = np->flow_label;
439         } else {
440                 if (ipv6_addr_any(&np->rcv_saddr))
441                         ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
442                 else
443                         ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
444
445                 sin->sin6_port = inet->sport;
446         }
447         if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
448                 sin->sin6_scope_id = sk->sk_bound_dev_if;
449         *uaddr_len = sizeof(*sin);
450         return(0);
451 }
452
453 EXPORT_SYMBOL(inet6_getname);
454
455 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
456 {
457         struct sock *sk = sock->sk;
458         struct net *net = sock_net(sk);
459
460         switch(cmd)
461         {
462         case SIOCGSTAMP:
463                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
464
465         case SIOCGSTAMPNS:
466                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
467
468         case SIOCADDRT:
469         case SIOCDELRT:
470
471                 return(ipv6_route_ioctl(net, cmd, (void __user *)arg));
472
473         case SIOCSIFADDR:
474                 return addrconf_add_ifaddr(net, (void __user *) arg);
475         case SIOCDIFADDR:
476                 return addrconf_del_ifaddr(net, (void __user *) arg);
477         case SIOCSIFDSTADDR:
478                 return addrconf_set_dstaddr(net, (void __user *) arg);
479         default:
480                 if (!sk->sk_prot->ioctl)
481                         return -ENOIOCTLCMD;
482                 return sk->sk_prot->ioctl(sk, cmd, arg);
483         }
484         /*NOTREACHED*/
485         return(0);
486 }
487
488 EXPORT_SYMBOL(inet6_ioctl);
489
490 const struct proto_ops inet6_stream_ops = {
491         .family            = PF_INET6,
492         .owner             = THIS_MODULE,
493         .release           = inet6_release,
494         .bind              = inet6_bind,
495         .connect           = inet_stream_connect,       /* ok           */
496         .socketpair        = sock_no_socketpair,        /* a do nothing */
497         .accept            = inet_accept,               /* ok           */
498         .getname           = inet6_getname,
499         .poll              = tcp_poll,                  /* ok           */
500         .ioctl             = inet6_ioctl,               /* must change  */
501         .listen            = inet_listen,               /* ok           */
502         .shutdown          = inet_shutdown,             /* ok           */
503         .setsockopt        = sock_common_setsockopt,    /* ok           */
504         .getsockopt        = sock_common_getsockopt,    /* ok           */
505         .sendmsg           = tcp_sendmsg,               /* ok           */
506         .recvmsg           = sock_common_recvmsg,       /* ok           */
507         .mmap              = sock_no_mmap,
508         .sendpage          = tcp_sendpage,
509         .splice_read       = tcp_splice_read,
510 #ifdef CONFIG_COMPAT
511         .compat_setsockopt = compat_sock_common_setsockopt,
512         .compat_getsockopt = compat_sock_common_getsockopt,
513 #endif
514 };
515
516 const struct proto_ops inet6_dgram_ops = {
517         .family            = PF_INET6,
518         .owner             = THIS_MODULE,
519         .release           = inet6_release,
520         .bind              = inet6_bind,
521         .connect           = inet_dgram_connect,        /* ok           */
522         .socketpair        = sock_no_socketpair,        /* a do nothing */
523         .accept            = sock_no_accept,            /* a do nothing */
524         .getname           = inet6_getname,
525         .poll              = udp_poll,                  /* ok           */
526         .ioctl             = inet6_ioctl,               /* must change  */
527         .listen            = sock_no_listen,            /* ok           */
528         .shutdown          = inet_shutdown,             /* ok           */
529         .setsockopt        = sock_common_setsockopt,    /* ok           */
530         .getsockopt        = sock_common_getsockopt,    /* ok           */
531         .sendmsg           = inet_sendmsg,              /* ok           */
532         .recvmsg           = sock_common_recvmsg,       /* ok           */
533         .mmap              = sock_no_mmap,
534         .sendpage          = sock_no_sendpage,
535 #ifdef CONFIG_COMPAT
536         .compat_setsockopt = compat_sock_common_setsockopt,
537         .compat_getsockopt = compat_sock_common_getsockopt,
538 #endif
539 };
540
541 static struct net_proto_family inet6_family_ops = {
542         .family = PF_INET6,
543         .create = inet6_create,
544         .owner  = THIS_MODULE,
545 };
546
547 int inet6_register_protosw(struct inet_protosw *p)
548 {
549         struct list_head *lh;
550         struct inet_protosw *answer;
551         struct list_head *last_perm;
552         int protocol = p->protocol;
553         int ret;
554
555         spin_lock_bh(&inetsw6_lock);
556
557         ret = -EINVAL;
558         if (p->type >= SOCK_MAX)
559                 goto out_illegal;
560
561         /* If we are trying to override a permanent protocol, bail. */
562         answer = NULL;
563         ret = -EPERM;
564         last_perm = &inetsw6[p->type];
565         list_for_each(lh, &inetsw6[p->type]) {
566                 answer = list_entry(lh, struct inet_protosw, list);
567
568                 /* Check only the non-wild match. */
569                 if (INET_PROTOSW_PERMANENT & answer->flags) {
570                         if (protocol == answer->protocol)
571                                 break;
572                         last_perm = lh;
573                 }
574
575                 answer = NULL;
576         }
577         if (answer)
578                 goto out_permanent;
579
580         /* Add the new entry after the last permanent entry if any, so that
581          * the new entry does not override a permanent entry when matched with
582          * a wild-card protocol. But it is allowed to override any existing
583          * non-permanent entry.  This means that when we remove this entry, the
584          * system automatically returns to the old behavior.
585          */
586         list_add_rcu(&p->list, last_perm);
587         ret = 0;
588 out:
589         spin_unlock_bh(&inetsw6_lock);
590         return ret;
591
592 out_permanent:
593         printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
594                protocol);
595         goto out;
596
597 out_illegal:
598         printk(KERN_ERR
599                "Ignoring attempt to register invalid socket type %d.\n",
600                p->type);
601         goto out;
602 }
603
604 EXPORT_SYMBOL(inet6_register_protosw);
605
606 void
607 inet6_unregister_protosw(struct inet_protosw *p)
608 {
609         if (INET_PROTOSW_PERMANENT & p->flags) {
610                 printk(KERN_ERR
611                        "Attempt to unregister permanent protocol %d.\n",
612                        p->protocol);
613         } else {
614                 spin_lock_bh(&inetsw6_lock);
615                 list_del_rcu(&p->list);
616                 spin_unlock_bh(&inetsw6_lock);
617
618                 synchronize_net();
619         }
620 }
621
622 EXPORT_SYMBOL(inet6_unregister_protosw);
623
624 int inet6_sk_rebuild_header(struct sock *sk)
625 {
626         int err;
627         struct dst_entry *dst;
628         struct ipv6_pinfo *np = inet6_sk(sk);
629
630         dst = __sk_dst_check(sk, np->dst_cookie);
631
632         if (dst == NULL) {
633                 struct inet_sock *inet = inet_sk(sk);
634                 struct in6_addr *final_p = NULL, final;
635                 struct flowi fl;
636
637                 memset(&fl, 0, sizeof(fl));
638                 fl.proto = sk->sk_protocol;
639                 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
640                 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
641                 fl.fl6_flowlabel = np->flow_label;
642                 fl.oif = sk->sk_bound_dev_if;
643                 fl.fl_ip_dport = inet->dport;
644                 fl.fl_ip_sport = inet->sport;
645                 security_sk_classify_flow(sk, &fl);
646
647                 if (np->opt && np->opt->srcrt) {
648                         struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
649                         ipv6_addr_copy(&final, &fl.fl6_dst);
650                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
651                         final_p = &final;
652                 }
653
654                 err = ip6_dst_lookup(sk, &dst, &fl);
655                 if (err) {
656                         sk->sk_route_caps = 0;
657                         return err;
658                 }
659                 if (final_p)
660                         ipv6_addr_copy(&fl.fl6_dst, final_p);
661
662                 if ((err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0) {
663                         sk->sk_err_soft = -err;
664                         return err;
665                 }
666
667                 __ip6_dst_store(sk, dst, NULL, NULL);
668         }
669
670         return 0;
671 }
672
673 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
674
675 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
676 {
677         struct ipv6_pinfo *np = inet6_sk(sk);
678         struct inet6_skb_parm *opt = IP6CB(skb);
679
680         if (np->rxopt.all) {
681                 if ((opt->hop && (np->rxopt.bits.hopopts ||
682                                   np->rxopt.bits.ohopopts)) ||
683                     ((IPV6_FLOWINFO_MASK &
684                       *(__be32 *)skb_network_header(skb)) &&
685                      np->rxopt.bits.rxflow) ||
686                     (opt->srcrt && (np->rxopt.bits.srcrt ||
687                      np->rxopt.bits.osrcrt)) ||
688                     ((opt->dst1 || opt->dst0) &&
689                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
690                         return 1;
691         }
692         return 0;
693 }
694
695 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
696
697 static int ipv6_gso_pull_exthdrs(struct sk_buff *skb, int proto)
698 {
699         struct inet6_protocol *ops = NULL;
700
701         for (;;) {
702                 struct ipv6_opt_hdr *opth;
703                 int len;
704
705                 if (proto != NEXTHDR_HOP) {
706                         ops = rcu_dereference(inet6_protos[proto]);
707
708                         if (unlikely(!ops))
709                                 break;
710
711                         if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
712                                 break;
713                 }
714
715                 if (unlikely(!pskb_may_pull(skb, 8)))
716                         break;
717
718                 opth = (void *)skb->data;
719                 len = ipv6_optlen(opth);
720
721                 if (unlikely(!pskb_may_pull(skb, len)))
722                         break;
723
724                 proto = opth->nexthdr;
725                 __skb_pull(skb, len);
726         }
727
728         return proto;
729 }
730
731 static int ipv6_gso_send_check(struct sk_buff *skb)
732 {
733         struct ipv6hdr *ipv6h;
734         struct inet6_protocol *ops;
735         int err = -EINVAL;
736
737         if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
738                 goto out;
739
740         ipv6h = ipv6_hdr(skb);
741         __skb_pull(skb, sizeof(*ipv6h));
742         err = -EPROTONOSUPPORT;
743
744         rcu_read_lock();
745         ops = rcu_dereference(inet6_protos[
746                 ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]);
747
748         if (likely(ops && ops->gso_send_check)) {
749                 skb_reset_transport_header(skb);
750                 err = ops->gso_send_check(skb);
751         }
752         rcu_read_unlock();
753
754 out:
755         return err;
756 }
757
758 static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features)
759 {
760         struct sk_buff *segs = ERR_PTR(-EINVAL);
761         struct ipv6hdr *ipv6h;
762         struct inet6_protocol *ops;
763
764         if (!(features & NETIF_F_V6_CSUM))
765                 features &= ~NETIF_F_SG;
766
767         if (unlikely(skb_shinfo(skb)->gso_type &
768                      ~(SKB_GSO_UDP |
769                        SKB_GSO_DODGY |
770                        SKB_GSO_TCP_ECN |
771                        SKB_GSO_TCPV6 |
772                        0)))
773                 goto out;
774
775         if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
776                 goto out;
777
778         ipv6h = ipv6_hdr(skb);
779         __skb_pull(skb, sizeof(*ipv6h));
780         segs = ERR_PTR(-EPROTONOSUPPORT);
781
782         rcu_read_lock();
783         ops = rcu_dereference(inet6_protos[
784                 ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]);
785
786         if (likely(ops && ops->gso_segment)) {
787                 skb_reset_transport_header(skb);
788                 segs = ops->gso_segment(skb, features);
789         }
790         rcu_read_unlock();
791
792         if (unlikely(IS_ERR(segs)))
793                 goto out;
794
795         for (skb = segs; skb; skb = skb->next) {
796                 ipv6h = ipv6_hdr(skb);
797                 ipv6h->payload_len = htons(skb->len - skb->mac_len -
798                                            sizeof(*ipv6h));
799         }
800
801 out:
802         return segs;
803 }
804
805 struct ipv6_gro_cb {
806         struct napi_gro_cb napi;
807         int proto;
808 };
809
810 #define IPV6_GRO_CB(skb) ((struct ipv6_gro_cb *)(skb)->cb)
811
812 static struct sk_buff **ipv6_gro_receive(struct sk_buff **head,
813                                          struct sk_buff *skb)
814 {
815         struct inet6_protocol *ops;
816         struct sk_buff **pp = NULL;
817         struct sk_buff *p;
818         struct ipv6hdr *iph;
819         unsigned int nlen;
820         int flush = 1;
821         int proto;
822         __wsum csum;
823
824         iph = skb_gro_header(skb, sizeof(*iph));
825         if (unlikely(!iph))
826                 goto out;
827
828         skb_gro_pull(skb, sizeof(*iph));
829         skb_set_transport_header(skb, skb_gro_offset(skb));
830
831         flush += ntohs(iph->payload_len) != skb_gro_len(skb);
832
833         rcu_read_lock();
834         proto = iph->nexthdr;
835         ops = rcu_dereference(inet6_protos[proto]);
836         if (!ops || !ops->gro_receive) {
837                 __pskb_pull(skb, skb_gro_offset(skb));
838                 proto = ipv6_gso_pull_exthdrs(skb, proto);
839                 skb_gro_pull(skb, -skb_transport_offset(skb));
840                 skb_reset_transport_header(skb);
841                 __skb_push(skb, skb_gro_offset(skb));
842
843                 if (!ops || !ops->gro_receive)
844                         goto out_unlock;
845
846                 iph = ipv6_hdr(skb);
847         }
848
849         IPV6_GRO_CB(skb)->proto = proto;
850
851         flush--;
852         nlen = skb_network_header_len(skb);
853
854         for (p = *head; p; p = p->next) {
855                 struct ipv6hdr *iph2;
856
857                 if (!NAPI_GRO_CB(p)->same_flow)
858                         continue;
859
860                 iph2 = ipv6_hdr(p);
861
862                 /* All fields must match except length. */
863                 if (nlen != skb_network_header_len(p) ||
864                     memcmp(iph, iph2, offsetof(struct ipv6hdr, payload_len)) ||
865                     memcmp(&iph->nexthdr, &iph2->nexthdr,
866                            nlen - offsetof(struct ipv6hdr, nexthdr))) {
867                         NAPI_GRO_CB(p)->same_flow = 0;
868                         continue;
869                 }
870
871                 NAPI_GRO_CB(p)->flush |= flush;
872         }
873
874         NAPI_GRO_CB(skb)->flush |= flush;
875
876         csum = skb->csum;
877         skb_postpull_rcsum(skb, iph, skb_network_header_len(skb));
878
879         pp = ops->gro_receive(head, skb);
880
881         skb->csum = csum;
882
883 out_unlock:
884         rcu_read_unlock();
885
886 out:
887         NAPI_GRO_CB(skb)->flush |= flush;
888
889         return pp;
890 }
891
892 static int ipv6_gro_complete(struct sk_buff *skb)
893 {
894         struct inet6_protocol *ops;
895         struct ipv6hdr *iph = ipv6_hdr(skb);
896         int err = -ENOSYS;
897
898         iph->payload_len = htons(skb->len - skb_network_offset(skb) -
899                                  sizeof(*iph));
900
901         rcu_read_lock();
902         ops = rcu_dereference(inet6_protos[IPV6_GRO_CB(skb)->proto]);
903         if (WARN_ON(!ops || !ops->gro_complete))
904                 goto out_unlock;
905
906         err = ops->gro_complete(skb);
907
908 out_unlock:
909         rcu_read_unlock();
910
911         return err;
912 }
913
914 static struct packet_type ipv6_packet_type __read_mostly = {
915         .type = cpu_to_be16(ETH_P_IPV6),
916         .func = ipv6_rcv,
917         .gso_send_check = ipv6_gso_send_check,
918         .gso_segment = ipv6_gso_segment,
919         .gro_receive = ipv6_gro_receive,
920         .gro_complete = ipv6_gro_complete,
921 };
922
923 static int __init ipv6_packet_init(void)
924 {
925         dev_add_pack(&ipv6_packet_type);
926         return 0;
927 }
928
929 static void ipv6_packet_cleanup(void)
930 {
931         dev_remove_pack(&ipv6_packet_type);
932 }
933
934 static int __net_init ipv6_init_mibs(struct net *net)
935 {
936         if (snmp_mib_init((void **)net->mib.udp_stats_in6,
937                           sizeof (struct udp_mib)) < 0)
938                 return -ENOMEM;
939         if (snmp_mib_init((void **)net->mib.udplite_stats_in6,
940                           sizeof (struct udp_mib)) < 0)
941                 goto err_udplite_mib;
942         if (snmp_mib_init((void **)net->mib.ipv6_statistics,
943                           sizeof(struct ipstats_mib)) < 0)
944                 goto err_ip_mib;
945         if (snmp_mib_init((void **)net->mib.icmpv6_statistics,
946                           sizeof(struct icmpv6_mib)) < 0)
947                 goto err_icmp_mib;
948         if (snmp_mib_init((void **)net->mib.icmpv6msg_statistics,
949                           sizeof(struct icmpv6msg_mib)) < 0)
950                 goto err_icmpmsg_mib;
951         return 0;
952
953 err_icmpmsg_mib:
954         snmp_mib_free((void **)net->mib.icmpv6_statistics);
955 err_icmp_mib:
956         snmp_mib_free((void **)net->mib.ipv6_statistics);
957 err_ip_mib:
958         snmp_mib_free((void **)net->mib.udplite_stats_in6);
959 err_udplite_mib:
960         snmp_mib_free((void **)net->mib.udp_stats_in6);
961         return -ENOMEM;
962 }
963
964 static void __net_exit ipv6_cleanup_mibs(struct net *net)
965 {
966         snmp_mib_free((void **)net->mib.udp_stats_in6);
967         snmp_mib_free((void **)net->mib.udplite_stats_in6);
968         snmp_mib_free((void **)net->mib.ipv6_statistics);
969         snmp_mib_free((void **)net->mib.icmpv6_statistics);
970         snmp_mib_free((void **)net->mib.icmpv6msg_statistics);
971 }
972
973 static int __net_init inet6_net_init(struct net *net)
974 {
975         int err = 0;
976
977         net->ipv6.sysctl.bindv6only = 0;
978         net->ipv6.sysctl.icmpv6_time = 1*HZ;
979
980         err = ipv6_init_mibs(net);
981         if (err)
982                 return err;
983 #ifdef CONFIG_PROC_FS
984         err = udp6_proc_init(net);
985         if (err)
986                 goto out;
987         err = tcp6_proc_init(net);
988         if (err)
989                 goto proc_tcp6_fail;
990         err = ac6_proc_init(net);
991         if (err)
992                 goto proc_ac6_fail;
993 #endif
994         return err;
995
996 #ifdef CONFIG_PROC_FS
997 proc_ac6_fail:
998         tcp6_proc_exit(net);
999 proc_tcp6_fail:
1000         udp6_proc_exit(net);
1001 out:
1002         ipv6_cleanup_mibs(net);
1003         return err;
1004 #endif
1005 }
1006
1007 static void inet6_net_exit(struct net *net)
1008 {
1009 #ifdef CONFIG_PROC_FS
1010         udp6_proc_exit(net);
1011         tcp6_proc_exit(net);
1012         ac6_proc_exit(net);
1013 #endif
1014         ipv6_cleanup_mibs(net);
1015 }
1016
1017 static struct pernet_operations inet6_net_ops = {
1018         .init = inet6_net_init,
1019         .exit = inet6_net_exit,
1020 };
1021
1022 static int __init inet6_init(void)
1023 {
1024         struct sk_buff *dummy_skb;
1025         struct list_head *r;
1026         int err = 0;
1027
1028         BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
1029
1030         /* Register the socket-side information for inet6_create.  */
1031         for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
1032                 INIT_LIST_HEAD(r);
1033
1034         if (disable_ipv6) {
1035                 printk(KERN_INFO
1036                        "IPv6: Loaded, but administratively disabled, "
1037                        "reboot required to enable\n");
1038                 goto out;
1039         }
1040
1041         err = proto_register(&tcpv6_prot, 1);
1042         if (err)
1043                 goto out;
1044
1045         err = proto_register(&udpv6_prot, 1);
1046         if (err)
1047                 goto out_unregister_tcp_proto;
1048
1049         err = proto_register(&udplitev6_prot, 1);
1050         if (err)
1051                 goto out_unregister_udp_proto;
1052
1053         err = proto_register(&rawv6_prot, 1);
1054         if (err)
1055                 goto out_unregister_udplite_proto;
1056
1057
1058         /* We MUST register RAW sockets before we create the ICMP6,
1059          * IGMP6, or NDISC control sockets.
1060          */
1061         err = rawv6_init();
1062         if (err)
1063                 goto out_unregister_raw_proto;
1064
1065         /* Register the family here so that the init calls below will
1066          * be able to create sockets. (?? is this dangerous ??)
1067          */
1068         err = sock_register(&inet6_family_ops);
1069         if (err)
1070                 goto out_sock_register_fail;
1071
1072 #ifdef CONFIG_SYSCTL
1073         err = ipv6_static_sysctl_register();
1074         if (err)
1075                 goto static_sysctl_fail;
1076 #endif
1077         /*
1078          *      ipngwg API draft makes clear that the correct semantics
1079          *      for TCP and UDP is to consider one TCP and UDP instance
1080          *      in a host availiable by both INET and INET6 APIs and
1081          *      able to communicate via both network protocols.
1082          */
1083
1084         err = register_pernet_subsys(&inet6_net_ops);
1085         if (err)
1086                 goto register_pernet_fail;
1087         err = icmpv6_init();
1088         if (err)
1089                 goto icmp_fail;
1090         err = ip6_mr_init();
1091         if (err)
1092                 goto ipmr_fail;
1093         err = ndisc_init();
1094         if (err)
1095                 goto ndisc_fail;
1096         err = igmp6_init();
1097         if (err)
1098                 goto igmp_fail;
1099         err = ipv6_netfilter_init();
1100         if (err)
1101                 goto netfilter_fail;
1102         /* Create /proc/foo6 entries. */
1103 #ifdef CONFIG_PROC_FS
1104         err = -ENOMEM;
1105         if (raw6_proc_init())
1106                 goto proc_raw6_fail;
1107         if (udplite6_proc_init())
1108                 goto proc_udplite6_fail;
1109         if (ipv6_misc_proc_init())
1110                 goto proc_misc6_fail;
1111         if (if6_proc_init())
1112                 goto proc_if6_fail;
1113 #endif
1114         err = ip6_route_init();
1115         if (err)
1116                 goto ip6_route_fail;
1117         err = ip6_flowlabel_init();
1118         if (err)
1119                 goto ip6_flowlabel_fail;
1120         err = addrconf_init();
1121         if (err)
1122                 goto addrconf_fail;
1123
1124         /* Init v6 extension headers. */
1125         err = ipv6_exthdrs_init();
1126         if (err)
1127                 goto ipv6_exthdrs_fail;
1128
1129         err = ipv6_frag_init();
1130         if (err)
1131                 goto ipv6_frag_fail;
1132
1133         /* Init v6 transport protocols. */
1134         err = udpv6_init();
1135         if (err)
1136                 goto udpv6_fail;
1137
1138         err = udplitev6_init();
1139         if (err)
1140                 goto udplitev6_fail;
1141
1142         err = tcpv6_init();
1143         if (err)
1144                 goto tcpv6_fail;
1145
1146         err = ipv6_packet_init();
1147         if (err)
1148                 goto ipv6_packet_fail;
1149
1150 #ifdef CONFIG_SYSCTL
1151         err = ipv6_sysctl_register();
1152         if (err)
1153                 goto sysctl_fail;
1154 #endif
1155 out:
1156         return err;
1157
1158 #ifdef CONFIG_SYSCTL
1159 sysctl_fail:
1160         ipv6_packet_cleanup();
1161 #endif
1162 ipv6_packet_fail:
1163         tcpv6_exit();
1164 tcpv6_fail:
1165         udplitev6_exit();
1166 udplitev6_fail:
1167         udpv6_exit();
1168 udpv6_fail:
1169         ipv6_frag_exit();
1170 ipv6_frag_fail:
1171         ipv6_exthdrs_exit();
1172 ipv6_exthdrs_fail:
1173         addrconf_cleanup();
1174 addrconf_fail:
1175         ip6_flowlabel_cleanup();
1176 ip6_flowlabel_fail:
1177         ip6_route_cleanup();
1178 ip6_route_fail:
1179 #ifdef CONFIG_PROC_FS
1180         if6_proc_exit();
1181 proc_if6_fail:
1182         ipv6_misc_proc_exit();
1183 proc_misc6_fail:
1184         udplite6_proc_exit();
1185 proc_udplite6_fail:
1186         raw6_proc_exit();
1187 proc_raw6_fail:
1188 #endif
1189         ipv6_netfilter_fini();
1190 netfilter_fail:
1191         igmp6_cleanup();
1192 igmp_fail:
1193         ndisc_cleanup();
1194 ndisc_fail:
1195         ip6_mr_cleanup();
1196 ipmr_fail:
1197         icmpv6_cleanup();
1198 icmp_fail:
1199         unregister_pernet_subsys(&inet6_net_ops);
1200 register_pernet_fail:
1201 #ifdef CONFIG_SYSCTL
1202         ipv6_static_sysctl_unregister();
1203 static_sysctl_fail:
1204 #endif
1205         sock_unregister(PF_INET6);
1206         rtnl_unregister_all(PF_INET6);
1207 out_sock_register_fail:
1208         rawv6_exit();
1209 out_unregister_raw_proto:
1210         proto_unregister(&rawv6_prot);
1211 out_unregister_udplite_proto:
1212         proto_unregister(&udplitev6_prot);
1213 out_unregister_udp_proto:
1214         proto_unregister(&udpv6_prot);
1215 out_unregister_tcp_proto:
1216         proto_unregister(&tcpv6_prot);
1217         goto out;
1218 }
1219 module_init(inet6_init);
1220
1221 static void __exit inet6_exit(void)
1222 {
1223         if (disable_ipv6)
1224                 return;
1225
1226         /* First of all disallow new sockets creation. */
1227         sock_unregister(PF_INET6);
1228         /* Disallow any further netlink messages */
1229         rtnl_unregister_all(PF_INET6);
1230
1231 #ifdef CONFIG_SYSCTL
1232         ipv6_sysctl_unregister();
1233 #endif
1234         udpv6_exit();
1235         udplitev6_exit();
1236         tcpv6_exit();
1237
1238         /* Cleanup code parts. */
1239         ipv6_packet_cleanup();
1240         ipv6_frag_exit();
1241         ipv6_exthdrs_exit();
1242         addrconf_cleanup();
1243         ip6_flowlabel_cleanup();
1244         ip6_route_cleanup();
1245 #ifdef CONFIG_PROC_FS
1246
1247         /* Cleanup code parts. */
1248         if6_proc_exit();
1249         ipv6_misc_proc_exit();
1250         udplite6_proc_exit();
1251         raw6_proc_exit();
1252 #endif
1253         ipv6_netfilter_fini();
1254         igmp6_cleanup();
1255         ndisc_cleanup();
1256         ip6_mr_cleanup();
1257         icmpv6_cleanup();
1258         rawv6_exit();
1259
1260         unregister_pernet_subsys(&inet6_net_ops);
1261 #ifdef CONFIG_SYSCTL
1262         ipv6_static_sysctl_unregister();
1263 #endif
1264         proto_unregister(&rawv6_prot);
1265         proto_unregister(&udplitev6_prot);
1266         proto_unregister(&udpv6_prot);
1267         proto_unregister(&tcpv6_prot);
1268 }
1269 module_exit(inet6_exit);
1270
1271 MODULE_ALIAS_NETPROTO(PF_INET6);