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[NETNS][IPV6]: Make bindv6only sysctl per namespace.
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1 /*
2  *      PF_INET6 socket protocol family
3  *      Linux INET6 implementation
4  *
5  *      Authors:
6  *      Pedro Roque             <roque@di.fc.ul.pt>
7  *
8  *      Adapted from linux/net/ipv4/af_inet.c
9  *
10  *      $Id: af_inet6.c,v 1.66 2002/02/01 22:01:04 davem Exp $
11  *
12  *      Fixes:
13  *      piggy, Karl Knutson     :       Socket protocol table
14  *      Hideaki YOSHIFUJI       :       sin6_scope_id support
15  *      Arnaldo Melo            :       check proc_net_create return, cleanups
16  *
17  *      This program is free software; you can redistribute it and/or
18  *      modify it under the terms of the GNU General Public License
19  *      as published by the Free Software Foundation; either version
20  *      2 of the License, or (at your option) any later version.
21  */
22
23
24 #include <linux/module.h>
25 #include <linux/capability.h>
26 #include <linux/errno.h>
27 #include <linux/types.h>
28 #include <linux/socket.h>
29 #include <linux/in.h>
30 #include <linux/kernel.h>
31 #include <linux/timer.h>
32 #include <linux/string.h>
33 #include <linux/sockios.h>
34 #include <linux/net.h>
35 #include <linux/fcntl.h>
36 #include <linux/mm.h>
37 #include <linux/interrupt.h>
38 #include <linux/proc_fs.h>
39 #include <linux/stat.h>
40 #include <linux/init.h>
41
42 #include <linux/inet.h>
43 #include <linux/netdevice.h>
44 #include <linux/icmpv6.h>
45 #include <linux/netfilter_ipv6.h>
46
47 #include <net/ip.h>
48 #include <net/ipv6.h>
49 #include <net/udp.h>
50 #include <net/udplite.h>
51 #include <net/tcp.h>
52 #include <net/ipip.h>
53 #include <net/protocol.h>
54 #include <net/inet_common.h>
55 #include <net/transp_v6.h>
56 #include <net/ip6_route.h>
57 #include <net/addrconf.h>
58 #ifdef CONFIG_IPV6_TUNNEL
59 #include <net/ip6_tunnel.h>
60 #endif
61
62 #include <asm/uaccess.h>
63 #include <asm/system.h>
64
65 MODULE_AUTHOR("Cast of dozens");
66 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
67 MODULE_LICENSE("GPL");
68
69 /* 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 list_head *p;
88         struct inet_protosw *answer;
89         struct proto *answer_prot;
90         unsigned char answer_flags;
91         char answer_no_check;
92         int try_loading_module = 0;
93         int err;
94
95         if (net != &init_net)
96                 return -EAFNOSUPPORT;
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         answer = NULL;
105 lookup_protocol:
106         err = -ESOCKTNOSUPPORT;
107         rcu_read_lock();
108         list_for_each_rcu(p, &inetsw6[sock->type]) {
109                 answer = list_entry(p, struct inet_protosw, list);
110
111                 /* Check the non-wild match. */
112                 if (protocol == answer->protocol) {
113                         if (protocol != IPPROTO_IP)
114                                 break;
115                 } else {
116                         /* Check for the two wild cases. */
117                         if (IPPROTO_IP == protocol) {
118                                 protocol = answer->protocol;
119                                 break;
120                         }
121                         if (IPPROTO_IP == answer->protocol)
122                                 break;
123                 }
124                 err = -EPROTONOSUPPORT;
125                 answer = NULL;
126         }
127
128         if (!answer) {
129                 if (try_loading_module < 2) {
130                         rcu_read_unlock();
131                         /*
132                          * Be more specific, e.g. net-pf-10-proto-132-type-1
133                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
134                          */
135                         if (++try_loading_module == 1)
136                                 request_module("net-pf-%d-proto-%d-type-%d",
137                                                 PF_INET6, protocol, sock->type);
138                         /*
139                          * Fall back to generic, e.g. net-pf-10-proto-132
140                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
141                          */
142                         else
143                                 request_module("net-pf-%d-proto-%d",
144                                                 PF_INET6, protocol);
145                         goto lookup_protocol;
146                 } else
147                         goto out_rcu_unlock;
148         }
149
150         err = -EPERM;
151         if (answer->capability > 0 && !capable(answer->capability))
152                 goto out_rcu_unlock;
153
154         sock->ops = answer->ops;
155         answer_prot = answer->prot;
156         answer_no_check = answer->no_check;
157         answer_flags = answer->flags;
158         rcu_read_unlock();
159
160         BUG_TRAP(answer_prot->slab != NULL);
161
162         err = -ENOBUFS;
163         sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot);
164         if (sk == NULL)
165                 goto out;
166
167         sock_init_data(sock, sk);
168
169         err = 0;
170         sk->sk_no_check = answer_no_check;
171         if (INET_PROTOSW_REUSE & answer_flags)
172                 sk->sk_reuse = 1;
173
174         inet = inet_sk(sk);
175         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
176
177         if (SOCK_RAW == sock->type) {
178                 inet->num = protocol;
179                 if (IPPROTO_RAW == protocol)
180                         inet->hdrincl = 1;
181         }
182
183         sk->sk_destruct         = inet_sock_destruct;
184         sk->sk_family           = PF_INET6;
185         sk->sk_protocol         = protocol;
186
187         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
188
189         inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
190         np->hop_limit   = -1;
191         np->mcast_hops  = -1;
192         np->mc_loop     = 1;
193         np->pmtudisc    = IPV6_PMTUDISC_WANT;
194         np->ipv6only    = init_net.ipv6.sysctl.bindv6only;
195
196         /* Init the ipv4 part of the socket since we can have sockets
197          * using v6 API for ipv4.
198          */
199         inet->uc_ttl    = -1;
200
201         inet->mc_loop   = 1;
202         inet->mc_ttl    = 1;
203         inet->mc_index  = 0;
204         inet->mc_list   = NULL;
205
206         if (ipv4_config.no_pmtu_disc)
207                 inet->pmtudisc = IP_PMTUDISC_DONT;
208         else
209                 inet->pmtudisc = IP_PMTUDISC_WANT;
210         /*
211          * Increment only the relevant sk_prot->socks debug field, this changes
212          * the previous behaviour of incrementing both the equivalent to
213          * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
214          *
215          * This allows better debug granularity as we'll know exactly how many
216          * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
217          * transport protocol socks. -acme
218          */
219         sk_refcnt_debug_inc(sk);
220
221         if (inet->num) {
222                 /* It assumes that any protocol which allows
223                  * the user to assign a number at socket
224                  * creation time automatically shares.
225                  */
226                 inet->sport = htons(inet->num);
227                 sk->sk_prot->hash(sk);
228         }
229         if (sk->sk_prot->init) {
230                 err = sk->sk_prot->init(sk);
231                 if (err) {
232                         sk_common_release(sk);
233                         goto out;
234                 }
235         }
236 out:
237         return err;
238 out_rcu_unlock:
239         rcu_read_unlock();
240         goto out;
241 }
242
243
244 /* bind for INET6 API */
245 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
246 {
247         struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
248         struct sock *sk = sock->sk;
249         struct inet_sock *inet = inet_sk(sk);
250         struct ipv6_pinfo *np = inet6_sk(sk);
251         __be32 v4addr = 0;
252         unsigned short snum;
253         int addr_type = 0;
254         int err = 0;
255
256         /* If the socket has its own bind function then use it. */
257         if (sk->sk_prot->bind)
258                 return sk->sk_prot->bind(sk, uaddr, addr_len);
259
260         if (addr_len < SIN6_LEN_RFC2133)
261                 return -EINVAL;
262         addr_type = ipv6_addr_type(&addr->sin6_addr);
263         if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
264                 return -EINVAL;
265
266         snum = ntohs(addr->sin6_port);
267         if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
268                 return -EACCES;
269
270         lock_sock(sk);
271
272         /* Check these errors (active socket, double bind). */
273         if (sk->sk_state != TCP_CLOSE || inet->num) {
274                 err = -EINVAL;
275                 goto out;
276         }
277
278         /* Check if the address belongs to the host. */
279         if (addr_type == IPV6_ADDR_MAPPED) {
280                 v4addr = addr->sin6_addr.s6_addr32[3];
281                 if (inet_addr_type(v4addr) != RTN_LOCAL) {
282                         err = -EADDRNOTAVAIL;
283                         goto out;
284                 }
285         } else {
286                 if (addr_type != IPV6_ADDR_ANY) {
287                         struct net_device *dev = NULL;
288
289                         if (addr_type & IPV6_ADDR_LINKLOCAL) {
290                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
291                                     addr->sin6_scope_id) {
292                                         /* Override any existing binding, if another one
293                                          * is supplied by user.
294                                          */
295                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
296                                 }
297
298                                 /* Binding to link-local address requires an interface */
299                                 if (!sk->sk_bound_dev_if) {
300                                         err = -EINVAL;
301                                         goto out;
302                                 }
303                                 dev = dev_get_by_index(&init_net, sk->sk_bound_dev_if);
304                                 if (!dev) {
305                                         err = -ENODEV;
306                                         goto out;
307                                 }
308                         }
309
310                         /* ipv4 addr of the socket is invalid.  Only the
311                          * unspecified and mapped address have a v4 equivalent.
312                          */
313                         v4addr = LOOPBACK4_IPV6;
314                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
315                                 if (!ipv6_chk_addr(&addr->sin6_addr, dev, 0)) {
316                                         if (dev)
317                                                 dev_put(dev);
318                                         err = -EADDRNOTAVAIL;
319                                         goto out;
320                                 }
321                         }
322                         if (dev)
323                                 dev_put(dev);
324                 }
325         }
326
327         inet->rcv_saddr = v4addr;
328         inet->saddr = v4addr;
329
330         ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
331
332         if (!(addr_type & IPV6_ADDR_MULTICAST))
333                 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
334
335         /* Make sure we are allowed to bind here. */
336         if (sk->sk_prot->get_port(sk, snum)) {
337                 inet_reset_saddr(sk);
338                 err = -EADDRINUSE;
339                 goto out;
340         }
341
342         if (addr_type != IPV6_ADDR_ANY)
343                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
344         if (snum)
345                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
346         inet->sport = htons(inet->num);
347         inet->dport = 0;
348         inet->daddr = 0;
349 out:
350         release_sock(sk);
351         return err;
352 }
353
354 EXPORT_SYMBOL(inet6_bind);
355
356 int inet6_release(struct socket *sock)
357 {
358         struct sock *sk = sock->sk;
359
360         if (sk == NULL)
361                 return -EINVAL;
362
363         /* Free mc lists */
364         ipv6_sock_mc_close(sk);
365
366         /* Free ac lists */
367         ipv6_sock_ac_close(sk);
368
369         return inet_release(sock);
370 }
371
372 EXPORT_SYMBOL(inet6_release);
373
374 int inet6_destroy_sock(struct sock *sk)
375 {
376         struct ipv6_pinfo *np = inet6_sk(sk);
377         struct sk_buff *skb;
378         struct ipv6_txoptions *opt;
379
380         /* Release rx options */
381
382         if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
383                 kfree_skb(skb);
384
385         /* Free flowlabels */
386         fl6_free_socklist(sk);
387
388         /* Free tx options */
389
390         if ((opt = xchg(&np->opt, NULL)) != NULL)
391                 sock_kfree_s(sk, opt, opt->tot_len);
392
393         return 0;
394 }
395
396 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
397
398 /*
399  *      This does both peername and sockname.
400  */
401
402 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
403                  int *uaddr_len, int peer)
404 {
405         struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
406         struct sock *sk = sock->sk;
407         struct inet_sock *inet = inet_sk(sk);
408         struct ipv6_pinfo *np = inet6_sk(sk);
409
410         sin->sin6_family = AF_INET6;
411         sin->sin6_flowinfo = 0;
412         sin->sin6_scope_id = 0;
413         if (peer) {
414                 if (!inet->dport)
415                         return -ENOTCONN;
416                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
417                     peer == 1)
418                         return -ENOTCONN;
419                 sin->sin6_port = inet->dport;
420                 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
421                 if (np->sndflow)
422                         sin->sin6_flowinfo = np->flow_label;
423         } else {
424                 if (ipv6_addr_any(&np->rcv_saddr))
425                         ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
426                 else
427                         ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
428
429                 sin->sin6_port = inet->sport;
430         }
431         if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
432                 sin->sin6_scope_id = sk->sk_bound_dev_if;
433         *uaddr_len = sizeof(*sin);
434         return(0);
435 }
436
437 EXPORT_SYMBOL(inet6_getname);
438
439 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
440 {
441         struct sock *sk = sock->sk;
442
443         switch(cmd)
444         {
445         case SIOCGSTAMP:
446                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
447
448         case SIOCGSTAMPNS:
449                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
450
451         case SIOCADDRT:
452         case SIOCDELRT:
453
454                 return(ipv6_route_ioctl(cmd,(void __user *)arg));
455
456         case SIOCSIFADDR:
457                 return addrconf_add_ifaddr((void __user *) arg);
458         case SIOCDIFADDR:
459                 return addrconf_del_ifaddr((void __user *) arg);
460         case SIOCSIFDSTADDR:
461                 return addrconf_set_dstaddr((void __user *) arg);
462         default:
463                 if (!sk->sk_prot->ioctl)
464                         return -ENOIOCTLCMD;
465                 return sk->sk_prot->ioctl(sk, cmd, arg);
466         }
467         /*NOTREACHED*/
468         return(0);
469 }
470
471 EXPORT_SYMBOL(inet6_ioctl);
472
473 const struct proto_ops inet6_stream_ops = {
474         .family            = PF_INET6,
475         .owner             = THIS_MODULE,
476         .release           = inet6_release,
477         .bind              = inet6_bind,
478         .connect           = inet_stream_connect,       /* ok           */
479         .socketpair        = sock_no_socketpair,        /* a do nothing */
480         .accept            = inet_accept,               /* ok           */
481         .getname           = inet6_getname,
482         .poll              = tcp_poll,                  /* ok           */
483         .ioctl             = inet6_ioctl,               /* must change  */
484         .listen            = inet_listen,               /* ok           */
485         .shutdown          = inet_shutdown,             /* ok           */
486         .setsockopt        = sock_common_setsockopt,    /* ok           */
487         .getsockopt        = sock_common_getsockopt,    /* ok           */
488         .sendmsg           = tcp_sendmsg,               /* ok           */
489         .recvmsg           = sock_common_recvmsg,       /* ok           */
490         .mmap              = sock_no_mmap,
491         .sendpage          = tcp_sendpage,
492         .splice_read       = tcp_splice_read,
493 #ifdef CONFIG_COMPAT
494         .compat_setsockopt = compat_sock_common_setsockopt,
495         .compat_getsockopt = compat_sock_common_getsockopt,
496 #endif
497 };
498
499 const struct proto_ops inet6_dgram_ops = {
500         .family            = PF_INET6,
501         .owner             = THIS_MODULE,
502         .release           = inet6_release,
503         .bind              = inet6_bind,
504         .connect           = inet_dgram_connect,        /* ok           */
505         .socketpair        = sock_no_socketpair,        /* a do nothing */
506         .accept            = sock_no_accept,            /* a do nothing */
507         .getname           = inet6_getname,
508         .poll              = udp_poll,                  /* ok           */
509         .ioctl             = inet6_ioctl,               /* must change  */
510         .listen            = sock_no_listen,            /* ok           */
511         .shutdown          = inet_shutdown,             /* ok           */
512         .setsockopt        = sock_common_setsockopt,    /* ok           */
513         .getsockopt        = sock_common_getsockopt,    /* ok           */
514         .sendmsg           = inet_sendmsg,              /* ok           */
515         .recvmsg           = sock_common_recvmsg,       /* ok           */
516         .mmap              = sock_no_mmap,
517         .sendpage          = sock_no_sendpage,
518 #ifdef CONFIG_COMPAT
519         .compat_setsockopt = compat_sock_common_setsockopt,
520         .compat_getsockopt = compat_sock_common_getsockopt,
521 #endif
522 };
523
524 static struct net_proto_family inet6_family_ops = {
525         .family = PF_INET6,
526         .create = inet6_create,
527         .owner  = THIS_MODULE,
528 };
529
530 int inet6_register_protosw(struct inet_protosw *p)
531 {
532         struct list_head *lh;
533         struct inet_protosw *answer;
534         struct list_head *last_perm;
535         int protocol = p->protocol;
536         int ret;
537
538         spin_lock_bh(&inetsw6_lock);
539
540         ret = -EINVAL;
541         if (p->type >= SOCK_MAX)
542                 goto out_illegal;
543
544         /* If we are trying to override a permanent protocol, bail. */
545         answer = NULL;
546         ret = -EPERM;
547         last_perm = &inetsw6[p->type];
548         list_for_each(lh, &inetsw6[p->type]) {
549                 answer = list_entry(lh, struct inet_protosw, list);
550
551                 /* Check only the non-wild match. */
552                 if (INET_PROTOSW_PERMANENT & answer->flags) {
553                         if (protocol == answer->protocol)
554                                 break;
555                         last_perm = lh;
556                 }
557
558                 answer = NULL;
559         }
560         if (answer)
561                 goto out_permanent;
562
563         /* Add the new entry after the last permanent entry if any, so that
564          * the new entry does not override a permanent entry when matched with
565          * a wild-card protocol. But it is allowed to override any existing
566          * non-permanent entry.  This means that when we remove this entry, the
567          * system automatically returns to the old behavior.
568          */
569         list_add_rcu(&p->list, last_perm);
570         ret = 0;
571 out:
572         spin_unlock_bh(&inetsw6_lock);
573         return ret;
574
575 out_permanent:
576         printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
577                protocol);
578         goto out;
579
580 out_illegal:
581         printk(KERN_ERR
582                "Ignoring attempt to register invalid socket type %d.\n",
583                p->type);
584         goto out;
585 }
586
587 EXPORT_SYMBOL(inet6_register_protosw);
588
589 void
590 inet6_unregister_protosw(struct inet_protosw *p)
591 {
592         if (INET_PROTOSW_PERMANENT & p->flags) {
593                 printk(KERN_ERR
594                        "Attempt to unregister permanent protocol %d.\n",
595                        p->protocol);
596         } else {
597                 spin_lock_bh(&inetsw6_lock);
598                 list_del_rcu(&p->list);
599                 spin_unlock_bh(&inetsw6_lock);
600
601                 synchronize_net();
602         }
603 }
604
605 EXPORT_SYMBOL(inet6_unregister_protosw);
606
607 int inet6_sk_rebuild_header(struct sock *sk)
608 {
609         int err;
610         struct dst_entry *dst;
611         struct ipv6_pinfo *np = inet6_sk(sk);
612
613         dst = __sk_dst_check(sk, np->dst_cookie);
614
615         if (dst == NULL) {
616                 struct inet_sock *inet = inet_sk(sk);
617                 struct in6_addr *final_p = NULL, final;
618                 struct flowi fl;
619
620                 memset(&fl, 0, sizeof(fl));
621                 fl.proto = sk->sk_protocol;
622                 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
623                 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
624                 fl.fl6_flowlabel = np->flow_label;
625                 fl.oif = sk->sk_bound_dev_if;
626                 fl.fl_ip_dport = inet->dport;
627                 fl.fl_ip_sport = inet->sport;
628                 security_sk_classify_flow(sk, &fl);
629
630                 if (np->opt && np->opt->srcrt) {
631                         struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
632                         ipv6_addr_copy(&final, &fl.fl6_dst);
633                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
634                         final_p = &final;
635                 }
636
637                 err = ip6_dst_lookup(sk, &dst, &fl);
638                 if (err) {
639                         sk->sk_route_caps = 0;
640                         return err;
641                 }
642                 if (final_p)
643                         ipv6_addr_copy(&fl.fl6_dst, final_p);
644
645                 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
646                         sk->sk_err_soft = -err;
647                         return err;
648                 }
649
650                 __ip6_dst_store(sk, dst, NULL, NULL);
651         }
652
653         return 0;
654 }
655
656 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
657
658 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
659 {
660         struct ipv6_pinfo *np = inet6_sk(sk);
661         struct inet6_skb_parm *opt = IP6CB(skb);
662
663         if (np->rxopt.all) {
664                 if ((opt->hop && (np->rxopt.bits.hopopts ||
665                                   np->rxopt.bits.ohopopts)) ||
666                     ((IPV6_FLOWINFO_MASK &
667                       *(__be32 *)skb_network_header(skb)) &&
668                      np->rxopt.bits.rxflow) ||
669                     (opt->srcrt && (np->rxopt.bits.srcrt ||
670                      np->rxopt.bits.osrcrt)) ||
671                     ((opt->dst1 || opt->dst0) &&
672                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
673                         return 1;
674         }
675         return 0;
676 }
677
678 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
679
680 static int __init init_ipv6_mibs(void)
681 {
682         if (snmp_mib_init((void **)ipv6_statistics,
683                           sizeof(struct ipstats_mib)) < 0)
684                 goto err_ip_mib;
685         if (snmp_mib_init((void **)icmpv6_statistics,
686                           sizeof(struct icmpv6_mib)) < 0)
687                 goto err_icmp_mib;
688         if (snmp_mib_init((void **)icmpv6msg_statistics,
689                           sizeof(struct icmpv6msg_mib)) < 0)
690                 goto err_icmpmsg_mib;
691         if (snmp_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib)) < 0)
692                 goto err_udp_mib;
693         if (snmp_mib_init((void **)udplite_stats_in6,
694                           sizeof (struct udp_mib)) < 0)
695                 goto err_udplite_mib;
696         return 0;
697
698 err_udplite_mib:
699         snmp_mib_free((void **)udp_stats_in6);
700 err_udp_mib:
701         snmp_mib_free((void **)icmpv6msg_statistics);
702 err_icmpmsg_mib:
703         snmp_mib_free((void **)icmpv6_statistics);
704 err_icmp_mib:
705         snmp_mib_free((void **)ipv6_statistics);
706 err_ip_mib:
707         return -ENOMEM;
708
709 }
710
711 static void cleanup_ipv6_mibs(void)
712 {
713         snmp_mib_free((void **)ipv6_statistics);
714         snmp_mib_free((void **)icmpv6_statistics);
715         snmp_mib_free((void **)icmpv6msg_statistics);
716         snmp_mib_free((void **)udp_stats_in6);
717         snmp_mib_free((void **)udplite_stats_in6);
718 }
719
720 static int inet6_net_init(struct net *net)
721 {
722         net->ipv6.sysctl.bindv6only = 0;
723         return 0;
724 }
725
726 static void inet6_net_exit(struct net *net)
727 {
728         return;
729 }
730
731 static struct pernet_operations inet6_net_ops = {
732         .init = inet6_net_init,
733         .exit = inet6_net_exit,
734 };
735
736 static int __init inet6_init(void)
737 {
738         struct sk_buff *dummy_skb;
739         struct list_head *r;
740         int err;
741
742         BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
743
744 #ifdef MODULE
745 #if 0 /* FIXME --RR */
746         if (!mod_member_present(&__this_module, can_unload))
747           return -EINVAL;
748
749         __this_module.can_unload = &ipv6_unload;
750 #endif
751 #endif
752         err = proto_register(&tcpv6_prot, 1);
753         if (err)
754                 goto out;
755
756         err = proto_register(&udpv6_prot, 1);
757         if (err)
758                 goto out_unregister_tcp_proto;
759
760         err = proto_register(&udplitev6_prot, 1);
761         if (err)
762                 goto out_unregister_udp_proto;
763
764         err = proto_register(&rawv6_prot, 1);
765         if (err)
766                 goto out_unregister_udplite_proto;
767
768
769         /* Register the socket-side information for inet6_create.  */
770         for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
771                 INIT_LIST_HEAD(r);
772
773         /* We MUST register RAW sockets before we create the ICMP6,
774          * IGMP6, or NDISC control sockets.
775          */
776         err = rawv6_init();
777         if (err)
778                 goto out_unregister_raw_proto;
779
780         /* Register the family here so that the init calls below will
781          * be able to create sockets. (?? is this dangerous ??)
782          */
783         err = sock_register(&inet6_family_ops);
784         if (err)
785                 goto out_sock_register_fail;
786
787         /* Initialise ipv6 mibs */
788         err = init_ipv6_mibs();
789         if (err)
790                 goto out_unregister_sock;
791
792         /*
793          *      ipngwg API draft makes clear that the correct semantics
794          *      for TCP and UDP is to consider one TCP and UDP instance
795          *      in a host availiable by both INET and INET6 APIs and
796          *      able to communicate via both network protocols.
797          */
798
799         err = register_pernet_subsys(&inet6_net_ops);
800         if (err)
801                 goto register_pernet_fail;
802
803 #ifdef CONFIG_SYSCTL
804         err = ipv6_sysctl_register();
805         if (err)
806                 goto sysctl_fail;
807 #endif
808         err = icmpv6_init(&inet6_family_ops);
809         if (err)
810                 goto icmp_fail;
811         err = ndisc_init(&inet6_family_ops);
812         if (err)
813                 goto ndisc_fail;
814         err = igmp6_init(&inet6_family_ops);
815         if (err)
816                 goto igmp_fail;
817         err = ipv6_netfilter_init();
818         if (err)
819                 goto netfilter_fail;
820         /* Create /proc/foo6 entries. */
821 #ifdef CONFIG_PROC_FS
822         err = -ENOMEM;
823         if (raw6_proc_init())
824                 goto proc_raw6_fail;
825         if (tcp6_proc_init())
826                 goto proc_tcp6_fail;
827         if (udp6_proc_init())
828                 goto proc_udp6_fail;
829         if (udplite6_proc_init())
830                 goto proc_udplite6_fail;
831         if (ipv6_misc_proc_init())
832                 goto proc_misc6_fail;
833
834         if (ac6_proc_init())
835                 goto proc_anycast6_fail;
836         if (if6_proc_init())
837                 goto proc_if6_fail;
838 #endif
839         err = ip6_route_init();
840         if (err)
841                 goto ip6_route_fail;
842         err = ip6_flowlabel_init();
843         if (err)
844                 goto ip6_flowlabel_fail;
845         err = addrconf_init();
846         if (err)
847                 goto addrconf_fail;
848
849         /* Init v6 extension headers. */
850         err = ipv6_exthdrs_init();
851         if (err)
852                 goto ipv6_exthdrs_fail;
853
854         err = ipv6_frag_init();
855         if (err)
856                 goto ipv6_frag_fail;
857
858         /* Init v6 transport protocols. */
859         err = udpv6_init();
860         if (err)
861                 goto udpv6_fail;
862
863         err = udplitev6_init();
864         if (err)
865                 goto udplitev6_fail;
866
867         err = tcpv6_init();
868         if (err)
869                 goto tcpv6_fail;
870
871         err = ipv6_packet_init();
872         if (err)
873                 goto ipv6_packet_fail;
874 out:
875         return err;
876
877 ipv6_packet_fail:
878         tcpv6_exit();
879 tcpv6_fail:
880         udplitev6_exit();
881 udplitev6_fail:
882         udpv6_exit();
883 udpv6_fail:
884         ipv6_frag_exit();
885 ipv6_frag_fail:
886         ipv6_exthdrs_exit();
887 ipv6_exthdrs_fail:
888         addrconf_cleanup();
889 addrconf_fail:
890         ip6_flowlabel_cleanup();
891 ip6_flowlabel_fail:
892         ip6_route_cleanup();
893 ip6_route_fail:
894 #ifdef CONFIG_PROC_FS
895         if6_proc_exit();
896 proc_if6_fail:
897         ac6_proc_exit();
898 proc_anycast6_fail:
899         ipv6_misc_proc_exit();
900 proc_misc6_fail:
901         udplite6_proc_exit();
902 proc_udplite6_fail:
903         udp6_proc_exit();
904 proc_udp6_fail:
905         tcp6_proc_exit();
906 proc_tcp6_fail:
907         raw6_proc_exit();
908 proc_raw6_fail:
909 #endif
910         ipv6_netfilter_fini();
911 netfilter_fail:
912         igmp6_cleanup();
913 igmp_fail:
914         ndisc_cleanup();
915 ndisc_fail:
916         icmpv6_cleanup();
917 icmp_fail:
918 #ifdef CONFIG_SYSCTL
919         ipv6_sysctl_unregister();
920 sysctl_fail:
921 #endif
922         unregister_pernet_subsys(&inet6_net_ops);
923 register_pernet_fail:
924         cleanup_ipv6_mibs();
925 out_unregister_sock:
926         sock_unregister(PF_INET6);
927         rtnl_unregister_all(PF_INET6);
928 out_sock_register_fail:
929         rawv6_exit();
930 out_unregister_raw_proto:
931         proto_unregister(&rawv6_prot);
932 out_unregister_udplite_proto:
933         proto_unregister(&udplitev6_prot);
934 out_unregister_udp_proto:
935         proto_unregister(&udpv6_prot);
936 out_unregister_tcp_proto:
937         proto_unregister(&tcpv6_prot);
938         goto out;
939 }
940 module_init(inet6_init);
941
942 static void __exit inet6_exit(void)
943 {
944         /* First of all disallow new sockets creation. */
945         sock_unregister(PF_INET6);
946         /* Disallow any further netlink messages */
947         rtnl_unregister_all(PF_INET6);
948
949         udpv6_exit();
950         udplitev6_exit();
951         tcpv6_exit();
952
953         /* Cleanup code parts. */
954         ipv6_packet_cleanup();
955         ipv6_frag_exit();
956         ipv6_exthdrs_exit();
957         addrconf_cleanup();
958         ip6_flowlabel_cleanup();
959         ip6_route_cleanup();
960 #ifdef CONFIG_PROC_FS
961
962         /* Cleanup code parts. */
963         if6_proc_exit();
964         ac6_proc_exit();
965         ipv6_misc_proc_exit();
966         udplite6_proc_exit();
967         udp6_proc_exit();
968         tcp6_proc_exit();
969         raw6_proc_exit();
970 #endif
971         ipv6_netfilter_fini();
972         igmp6_cleanup();
973         ndisc_cleanup();
974         icmpv6_cleanup();
975         rawv6_exit();
976 #ifdef CONFIG_SYSCTL
977         ipv6_sysctl_unregister();
978 #endif
979         unregister_pernet_subsys(&inet6_net_ops);
980         cleanup_ipv6_mibs();
981         proto_unregister(&rawv6_prot);
982         proto_unregister(&udplitev6_prot);
983         proto_unregister(&udpv6_prot);
984         proto_unregister(&tcpv6_prot);
985 }
986 module_exit(inet6_exit);
987
988 MODULE_ALIAS_NETPROTO(PF_INET6);