72b898fe2dde426bc438298352cf828507041a30
[linux-2.6.git] / net / ipv6 / af_inet6.c
1 /*
2  *      PF_INET6 socket protocol family
3  *      Linux INET6 implementation
4  *
5  *      Authors:
6  *      Pedro Roque             <roque@di.fc.ul.pt>
7  *
8  *      Adapted from linux/net/ipv4/af_inet.c
9  *
10  *      $Id: af_inet6.c,v 1.66 2002/02/01 22:01:04 davem Exp $
11  *
12  *      Fixes:
13  *      piggy, Karl Knutson     :       Socket protocol table
14  *      Hideaki YOSHIFUJI       :       sin6_scope_id support
15  *      Arnaldo Melo            :       check proc_net_create return, cleanups
16  *
17  *      This program is free software; you can redistribute it and/or
18  *      modify it under the terms of the GNU General Public License
19  *      as published by the Free Software Foundation; either version
20  *      2 of the License, or (at your option) any later version.
21  */
22
23
24 #include <linux/module.h>
25 #include <linux/capability.h>
26 #include <linux/errno.h>
27 #include <linux/types.h>
28 #include <linux/socket.h>
29 #include <linux/in.h>
30 #include <linux/kernel.h>
31 #include <linux/timer.h>
32 #include <linux/string.h>
33 #include <linux/sockios.h>
34 #include <linux/net.h>
35 #include <linux/fcntl.h>
36 #include <linux/mm.h>
37 #include <linux/interrupt.h>
38 #include <linux/proc_fs.h>
39 #include <linux/stat.h>
40 #include <linux/init.h>
41
42 #include <linux/inet.h>
43 #include <linux/netdevice.h>
44 #include <linux/icmpv6.h>
45 #include <linux/netfilter_ipv6.h>
46
47 #include <net/ip.h>
48 #include <net/ipv6.h>
49 #include <net/udp.h>
50 #include <net/udplite.h>
51 #include <net/tcp.h>
52 #include <net/ipip.h>
53 #include <net/protocol.h>
54 #include <net/inet_common.h>
55 #include <net/transp_v6.h>
56 #include <net/ip6_route.h>
57 #include <net/addrconf.h>
58 #ifdef CONFIG_IPV6_TUNNEL
59 #include <net/ip6_tunnel.h>
60 #endif
61
62 #include <asm/uaccess.h>
63 #include <asm/system.h>
64
65 MODULE_AUTHOR("Cast of dozens");
66 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
67 MODULE_LICENSE("GPL");
68
69 int sysctl_ipv6_bindv6only __read_mostly;
70
71 /* The inetsw6 table contains everything that inet6_create needs to
72  * build a new socket.
73  */
74 static struct list_head inetsw6[SOCK_MAX];
75 static DEFINE_SPINLOCK(inetsw6_lock);
76
77 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
78 {
79         const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
80
81         return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
82 }
83
84 static int inet6_create(struct net *net, struct socket *sock, int protocol)
85 {
86         struct inet_sock *inet;
87         struct ipv6_pinfo *np;
88         struct sock *sk;
89         struct list_head *p;
90         struct inet_protosw *answer;
91         struct proto *answer_prot;
92         unsigned char answer_flags;
93         char answer_no_check;
94         int try_loading_module = 0;
95         int err;
96
97         if (net != &init_net)
98                 return -EAFNOSUPPORT;
99
100         if (sock->type != SOCK_RAW &&
101             sock->type != SOCK_DGRAM &&
102             !inet_ehash_secret)
103                 build_ehash_secret();
104
105         /* Look for the requested type/protocol pair. */
106         answer = NULL;
107 lookup_protocol:
108         err = -ESOCKTNOSUPPORT;
109         rcu_read_lock();
110         list_for_each_rcu(p, &inetsw6[sock->type]) {
111                 answer = list_entry(p, struct inet_protosw, list);
112
113                 /* Check the non-wild match. */
114                 if (protocol == answer->protocol) {
115                         if (protocol != IPPROTO_IP)
116                                 break;
117                 } else {
118                         /* Check for the two wild cases. */
119                         if (IPPROTO_IP == protocol) {
120                                 protocol = answer->protocol;
121                                 break;
122                         }
123                         if (IPPROTO_IP == answer->protocol)
124                                 break;
125                 }
126                 err = -EPROTONOSUPPORT;
127                 answer = NULL;
128         }
129
130         if (!answer) {
131                 if (try_loading_module < 2) {
132                         rcu_read_unlock();
133                         /*
134                          * Be more specific, e.g. net-pf-10-proto-132-type-1
135                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
136                          */
137                         if (++try_loading_module == 1)
138                                 request_module("net-pf-%d-proto-%d-type-%d",
139                                                 PF_INET6, protocol, sock->type);
140                         /*
141                          * Fall back to generic, e.g. net-pf-10-proto-132
142                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
143                          */
144                         else
145                                 request_module("net-pf-%d-proto-%d",
146                                                 PF_INET6, protocol);
147                         goto lookup_protocol;
148                 } else
149                         goto out_rcu_unlock;
150         }
151
152         err = -EPERM;
153         if (answer->capability > 0 && !capable(answer->capability))
154                 goto out_rcu_unlock;
155
156         sock->ops = answer->ops;
157         answer_prot = answer->prot;
158         answer_no_check = answer->no_check;
159         answer_flags = answer->flags;
160         rcu_read_unlock();
161
162         BUG_TRAP(answer_prot->slab != NULL);
163
164         err = -ENOBUFS;
165         sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot);
166         if (sk == NULL)
167                 goto out;
168
169         sock_init_data(sock, sk);
170
171         err = 0;
172         sk->sk_no_check = answer_no_check;
173         if (INET_PROTOSW_REUSE & answer_flags)
174                 sk->sk_reuse = 1;
175
176         inet = inet_sk(sk);
177         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
178
179         if (SOCK_RAW == sock->type) {
180                 inet->num = protocol;
181                 if (IPPROTO_RAW == protocol)
182                         inet->hdrincl = 1;
183         }
184
185         sk->sk_destruct         = inet_sock_destruct;
186         sk->sk_family           = PF_INET6;
187         sk->sk_protocol         = protocol;
188
189         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
190
191         inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
192         np->hop_limit   = -1;
193         np->mcast_hops  = -1;
194         np->mc_loop     = 1;
195         np->pmtudisc    = IPV6_PMTUDISC_WANT;
196         np->ipv6only    = sysctl_ipv6_bindv6only;
197
198         /* Init the ipv4 part of the socket since we can have sockets
199          * using v6 API for ipv4.
200          */
201         inet->uc_ttl    = -1;
202
203         inet->mc_loop   = 1;
204         inet->mc_ttl    = 1;
205         inet->mc_index  = 0;
206         inet->mc_list   = NULL;
207
208         if (ipv4_config.no_pmtu_disc)
209                 inet->pmtudisc = IP_PMTUDISC_DONT;
210         else
211                 inet->pmtudisc = IP_PMTUDISC_WANT;
212         /*
213          * Increment only the relevant sk_prot->socks debug field, this changes
214          * the previous behaviour of incrementing both the equivalent to
215          * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
216          *
217          * This allows better debug granularity as we'll know exactly how many
218          * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
219          * transport protocol socks. -acme
220          */
221         sk_refcnt_debug_inc(sk);
222
223         if (inet->num) {
224                 /* It assumes that any protocol which allows
225                  * the user to assign a number at socket
226                  * creation time automatically shares.
227                  */
228                 inet->sport = htons(inet->num);
229                 sk->sk_prot->hash(sk);
230         }
231         if (sk->sk_prot->init) {
232                 err = sk->sk_prot->init(sk);
233                 if (err) {
234                         sk_common_release(sk);
235                         goto out;
236                 }
237         }
238 out:
239         return err;
240 out_rcu_unlock:
241         rcu_read_unlock();
242         goto out;
243 }
244
245
246 /* bind for INET6 API */
247 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
248 {
249         struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
250         struct sock *sk = sock->sk;
251         struct inet_sock *inet = inet_sk(sk);
252         struct ipv6_pinfo *np = inet6_sk(sk);
253         __be32 v4addr = 0;
254         unsigned short snum;
255         int addr_type = 0;
256         int err = 0;
257
258         /* If the socket has its own bind function then use it. */
259         if (sk->sk_prot->bind)
260                 return sk->sk_prot->bind(sk, uaddr, addr_len);
261
262         if (addr_len < SIN6_LEN_RFC2133)
263                 return -EINVAL;
264         addr_type = ipv6_addr_type(&addr->sin6_addr);
265         if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
266                 return -EINVAL;
267
268         snum = ntohs(addr->sin6_port);
269         if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
270                 return -EACCES;
271
272         lock_sock(sk);
273
274         /* Check these errors (active socket, double bind). */
275         if (sk->sk_state != TCP_CLOSE || inet->num) {
276                 err = -EINVAL;
277                 goto out;
278         }
279
280         /* Check if the address belongs to the host. */
281         if (addr_type == IPV6_ADDR_MAPPED) {
282                 v4addr = addr->sin6_addr.s6_addr32[3];
283                 if (inet_addr_type(v4addr) != RTN_LOCAL) {
284                         err = -EADDRNOTAVAIL;
285                         goto out;
286                 }
287         } else {
288                 if (addr_type != IPV6_ADDR_ANY) {
289                         struct net_device *dev = NULL;
290
291                         if (addr_type & IPV6_ADDR_LINKLOCAL) {
292                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
293                                     addr->sin6_scope_id) {
294                                         /* Override any existing binding, if another one
295                                          * is supplied by user.
296                                          */
297                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
298                                 }
299
300                                 /* Binding to link-local address requires an interface */
301                                 if (!sk->sk_bound_dev_if) {
302                                         err = -EINVAL;
303                                         goto out;
304                                 }
305                                 dev = dev_get_by_index(&init_net, sk->sk_bound_dev_if);
306                                 if (!dev) {
307                                         err = -ENODEV;
308                                         goto out;
309                                 }
310                         }
311
312                         /* ipv4 addr of the socket is invalid.  Only the
313                          * unspecified and mapped address have a v4 equivalent.
314                          */
315                         v4addr = LOOPBACK4_IPV6;
316                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
317                                 if (!ipv6_chk_addr(&addr->sin6_addr, dev, 0)) {
318                                         if (dev)
319                                                 dev_put(dev);
320                                         err = -EADDRNOTAVAIL;
321                                         goto out;
322                                 }
323                         }
324                         if (dev)
325                                 dev_put(dev);
326                 }
327         }
328
329         inet->rcv_saddr = v4addr;
330         inet->saddr = v4addr;
331
332         ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
333
334         if (!(addr_type & IPV6_ADDR_MULTICAST))
335                 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
336
337         /* Make sure we are allowed to bind here. */
338         if (sk->sk_prot->get_port(sk, snum)) {
339                 inet_reset_saddr(sk);
340                 err = -EADDRINUSE;
341                 goto out;
342         }
343
344         if (addr_type != IPV6_ADDR_ANY)
345                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
346         if (snum)
347                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
348         inet->sport = htons(inet->num);
349         inet->dport = 0;
350         inet->daddr = 0;
351 out:
352         release_sock(sk);
353         return err;
354 }
355
356 EXPORT_SYMBOL(inet6_bind);
357
358 int inet6_release(struct socket *sock)
359 {
360         struct sock *sk = sock->sk;
361
362         if (sk == NULL)
363                 return -EINVAL;
364
365         /* Free mc lists */
366         ipv6_sock_mc_close(sk);
367
368         /* Free ac lists */
369         ipv6_sock_ac_close(sk);
370
371         return inet_release(sock);
372 }
373
374 EXPORT_SYMBOL(inet6_release);
375
376 int inet6_destroy_sock(struct sock *sk)
377 {
378         struct ipv6_pinfo *np = inet6_sk(sk);
379         struct sk_buff *skb;
380         struct ipv6_txoptions *opt;
381
382         /* Release rx options */
383
384         if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
385                 kfree_skb(skb);
386
387         /* Free flowlabels */
388         fl6_free_socklist(sk);
389
390         /* Free tx options */
391
392         if ((opt = xchg(&np->opt, NULL)) != NULL)
393                 sock_kfree_s(sk, opt, opt->tot_len);
394
395         return 0;
396 }
397
398 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
399
400 /*
401  *      This does both peername and sockname.
402  */
403
404 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
405                  int *uaddr_len, int peer)
406 {
407         struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
408         struct sock *sk = sock->sk;
409         struct inet_sock *inet = inet_sk(sk);
410         struct ipv6_pinfo *np = inet6_sk(sk);
411
412         sin->sin6_family = AF_INET6;
413         sin->sin6_flowinfo = 0;
414         sin->sin6_scope_id = 0;
415         if (peer) {
416                 if (!inet->dport)
417                         return -ENOTCONN;
418                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
419                     peer == 1)
420                         return -ENOTCONN;
421                 sin->sin6_port = inet->dport;
422                 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
423                 if (np->sndflow)
424                         sin->sin6_flowinfo = np->flow_label;
425         } else {
426                 if (ipv6_addr_any(&np->rcv_saddr))
427                         ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
428                 else
429                         ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
430
431                 sin->sin6_port = inet->sport;
432         }
433         if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
434                 sin->sin6_scope_id = sk->sk_bound_dev_if;
435         *uaddr_len = sizeof(*sin);
436         return(0);
437 }
438
439 EXPORT_SYMBOL(inet6_getname);
440
441 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
442 {
443         struct sock *sk = sock->sk;
444
445         switch(cmd)
446         {
447         case SIOCGSTAMP:
448                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
449
450         case SIOCGSTAMPNS:
451                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
452
453         case SIOCADDRT:
454         case SIOCDELRT:
455
456                 return(ipv6_route_ioctl(cmd,(void __user *)arg));
457
458         case SIOCSIFADDR:
459                 return addrconf_add_ifaddr((void __user *) arg);
460         case SIOCDIFADDR:
461                 return addrconf_del_ifaddr((void __user *) arg);
462         case SIOCSIFDSTADDR:
463                 return addrconf_set_dstaddr((void __user *) arg);
464         default:
465                 if (!sk->sk_prot->ioctl)
466                         return -ENOIOCTLCMD;
467                 return sk->sk_prot->ioctl(sk, cmd, arg);
468         }
469         /*NOTREACHED*/
470         return(0);
471 }
472
473 EXPORT_SYMBOL(inet6_ioctl);
474
475 const struct proto_ops inet6_stream_ops = {
476         .family            = PF_INET6,
477         .owner             = THIS_MODULE,
478         .release           = inet6_release,
479         .bind              = inet6_bind,
480         .connect           = inet_stream_connect,       /* ok           */
481         .socketpair        = sock_no_socketpair,        /* a do nothing */
482         .accept            = inet_accept,               /* ok           */
483         .getname           = inet6_getname,
484         .poll              = tcp_poll,                  /* ok           */
485         .ioctl             = inet6_ioctl,               /* must change  */
486         .listen            = inet_listen,               /* ok           */
487         .shutdown          = inet_shutdown,             /* ok           */
488         .setsockopt        = sock_common_setsockopt,    /* ok           */
489         .getsockopt        = sock_common_getsockopt,    /* ok           */
490         .sendmsg           = tcp_sendmsg,               /* ok           */
491         .recvmsg           = sock_common_recvmsg,       /* ok           */
492         .mmap              = sock_no_mmap,
493         .sendpage          = tcp_sendpage,
494         .splice_read       = tcp_splice_read,
495 #ifdef CONFIG_COMPAT
496         .compat_setsockopt = compat_sock_common_setsockopt,
497         .compat_getsockopt = compat_sock_common_getsockopt,
498 #endif
499 };
500
501 const struct proto_ops inet6_dgram_ops = {
502         .family            = PF_INET6,
503         .owner             = THIS_MODULE,
504         .release           = inet6_release,
505         .bind              = inet6_bind,
506         .connect           = inet_dgram_connect,        /* ok           */
507         .socketpair        = sock_no_socketpair,        /* a do nothing */
508         .accept            = sock_no_accept,            /* a do nothing */
509         .getname           = inet6_getname,
510         .poll              = udp_poll,                  /* ok           */
511         .ioctl             = inet6_ioctl,               /* must change  */
512         .listen            = sock_no_listen,            /* ok           */
513         .shutdown          = inet_shutdown,             /* ok           */
514         .setsockopt        = sock_common_setsockopt,    /* ok           */
515         .getsockopt        = sock_common_getsockopt,    /* ok           */
516         .sendmsg           = inet_sendmsg,              /* ok           */
517         .recvmsg           = sock_common_recvmsg,       /* ok           */
518         .mmap              = sock_no_mmap,
519         .sendpage          = sock_no_sendpage,
520 #ifdef CONFIG_COMPAT
521         .compat_setsockopt = compat_sock_common_setsockopt,
522         .compat_getsockopt = compat_sock_common_getsockopt,
523 #endif
524 };
525
526 static struct net_proto_family inet6_family_ops = {
527         .family = PF_INET6,
528         .create = inet6_create,
529         .owner  = THIS_MODULE,
530 };
531
532 int inet6_register_protosw(struct inet_protosw *p)
533 {
534         struct list_head *lh;
535         struct inet_protosw *answer;
536         struct list_head *last_perm;
537         int protocol = p->protocol;
538         int ret;
539
540         spin_lock_bh(&inetsw6_lock);
541
542         ret = -EINVAL;
543         if (p->type >= SOCK_MAX)
544                 goto out_illegal;
545
546         /* If we are trying to override a permanent protocol, bail. */
547         answer = NULL;
548         ret = -EPERM;
549         last_perm = &inetsw6[p->type];
550         list_for_each(lh, &inetsw6[p->type]) {
551                 answer = list_entry(lh, struct inet_protosw, list);
552
553                 /* Check only the non-wild match. */
554                 if (INET_PROTOSW_PERMANENT & answer->flags) {
555                         if (protocol == answer->protocol)
556                                 break;
557                         last_perm = lh;
558                 }
559
560                 answer = NULL;
561         }
562         if (answer)
563                 goto out_permanent;
564
565         /* Add the new entry after the last permanent entry if any, so that
566          * the new entry does not override a permanent entry when matched with
567          * a wild-card protocol. But it is allowed to override any existing
568          * non-permanent entry.  This means that when we remove this entry, the
569          * system automatically returns to the old behavior.
570          */
571         list_add_rcu(&p->list, last_perm);
572         ret = 0;
573 out:
574         spin_unlock_bh(&inetsw6_lock);
575         return ret;
576
577 out_permanent:
578         printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
579                protocol);
580         goto out;
581
582 out_illegal:
583         printk(KERN_ERR
584                "Ignoring attempt to register invalid socket type %d.\n",
585                p->type);
586         goto out;
587 }
588
589 EXPORT_SYMBOL(inet6_register_protosw);
590
591 void
592 inet6_unregister_protosw(struct inet_protosw *p)
593 {
594         if (INET_PROTOSW_PERMANENT & p->flags) {
595                 printk(KERN_ERR
596                        "Attempt to unregister permanent protocol %d.\n",
597                        p->protocol);
598         } else {
599                 spin_lock_bh(&inetsw6_lock);
600                 list_del_rcu(&p->list);
601                 spin_unlock_bh(&inetsw6_lock);
602
603                 synchronize_net();
604         }
605 }
606
607 EXPORT_SYMBOL(inet6_unregister_protosw);
608
609 int inet6_sk_rebuild_header(struct sock *sk)
610 {
611         int err;
612         struct dst_entry *dst;
613         struct ipv6_pinfo *np = inet6_sk(sk);
614
615         dst = __sk_dst_check(sk, np->dst_cookie);
616
617         if (dst == NULL) {
618                 struct inet_sock *inet = inet_sk(sk);
619                 struct in6_addr *final_p = NULL, final;
620                 struct flowi fl;
621
622                 memset(&fl, 0, sizeof(fl));
623                 fl.proto = sk->sk_protocol;
624                 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
625                 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
626                 fl.fl6_flowlabel = np->flow_label;
627                 fl.oif = sk->sk_bound_dev_if;
628                 fl.fl_ip_dport = inet->dport;
629                 fl.fl_ip_sport = inet->sport;
630                 security_sk_classify_flow(sk, &fl);
631
632                 if (np->opt && np->opt->srcrt) {
633                         struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
634                         ipv6_addr_copy(&final, &fl.fl6_dst);
635                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
636                         final_p = &final;
637                 }
638
639                 err = ip6_dst_lookup(sk, &dst, &fl);
640                 if (err) {
641                         sk->sk_route_caps = 0;
642                         return err;
643                 }
644                 if (final_p)
645                         ipv6_addr_copy(&fl.fl6_dst, final_p);
646
647                 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
648                         sk->sk_err_soft = -err;
649                         return err;
650                 }
651
652                 __ip6_dst_store(sk, dst, NULL, NULL);
653         }
654
655         return 0;
656 }
657
658 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
659
660 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
661 {
662         struct ipv6_pinfo *np = inet6_sk(sk);
663         struct inet6_skb_parm *opt = IP6CB(skb);
664
665         if (np->rxopt.all) {
666                 if ((opt->hop && (np->rxopt.bits.hopopts ||
667                                   np->rxopt.bits.ohopopts)) ||
668                     ((IPV6_FLOWINFO_MASK &
669                       *(__be32 *)skb_network_header(skb)) &&
670                      np->rxopt.bits.rxflow) ||
671                     (opt->srcrt && (np->rxopt.bits.srcrt ||
672                      np->rxopt.bits.osrcrt)) ||
673                     ((opt->dst1 || opt->dst0) &&
674                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
675                         return 1;
676         }
677         return 0;
678 }
679
680 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
681
682 static int __init init_ipv6_mibs(void)
683 {
684         if (snmp_mib_init((void **)ipv6_statistics,
685                           sizeof(struct ipstats_mib)) < 0)
686                 goto err_ip_mib;
687         if (snmp_mib_init((void **)icmpv6_statistics,
688                           sizeof(struct icmpv6_mib)) < 0)
689                 goto err_icmp_mib;
690         if (snmp_mib_init((void **)icmpv6msg_statistics,
691                           sizeof(struct icmpv6msg_mib)) < 0)
692                 goto err_icmpmsg_mib;
693         if (snmp_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib)) < 0)
694                 goto err_udp_mib;
695         if (snmp_mib_init((void **)udplite_stats_in6,
696                           sizeof (struct udp_mib)) < 0)
697                 goto err_udplite_mib;
698         return 0;
699
700 err_udplite_mib:
701         snmp_mib_free((void **)udp_stats_in6);
702 err_udp_mib:
703         snmp_mib_free((void **)icmpv6msg_statistics);
704 err_icmpmsg_mib:
705         snmp_mib_free((void **)icmpv6_statistics);
706 err_icmp_mib:
707         snmp_mib_free((void **)ipv6_statistics);
708 err_ip_mib:
709         return -ENOMEM;
710
711 }
712
713 static void cleanup_ipv6_mibs(void)
714 {
715         snmp_mib_free((void **)ipv6_statistics);
716         snmp_mib_free((void **)icmpv6_statistics);
717         snmp_mib_free((void **)icmpv6msg_statistics);
718         snmp_mib_free((void **)udp_stats_in6);
719         snmp_mib_free((void **)udplite_stats_in6);
720 }
721
722 static int inet6_net_init(struct net *net)
723 {
724         return 0;
725 }
726
727 static void inet6_net_exit(struct net *net)
728 {
729         return;
730 }
731
732 static struct pernet_operations inet6_net_ops = {
733         .init = inet6_net_init,
734         .exit = inet6_net_exit,
735 };
736
737 static int __init inet6_init(void)
738 {
739         struct sk_buff *dummy_skb;
740         struct list_head *r;
741         int err;
742
743         BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
744
745 #ifdef MODULE
746 #if 0 /* FIXME --RR */
747         if (!mod_member_present(&__this_module, can_unload))
748           return -EINVAL;
749
750         __this_module.can_unload = &ipv6_unload;
751 #endif
752 #endif
753         err = proto_register(&tcpv6_prot, 1);
754         if (err)
755                 goto out;
756
757         err = proto_register(&udpv6_prot, 1);
758         if (err)
759                 goto out_unregister_tcp_proto;
760
761         err = proto_register(&udplitev6_prot, 1);
762         if (err)
763                 goto out_unregister_udp_proto;
764
765         err = proto_register(&rawv6_prot, 1);
766         if (err)
767                 goto out_unregister_udplite_proto;
768
769
770         /* Register the socket-side information for inet6_create.  */
771         for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
772                 INIT_LIST_HEAD(r);
773
774         /* We MUST register RAW sockets before we create the ICMP6,
775          * IGMP6, or NDISC control sockets.
776          */
777         err = rawv6_init();
778         if (err)
779                 goto out_unregister_raw_proto;
780
781         /* Register the family here so that the init calls below will
782          * be able to create sockets. (?? is this dangerous ??)
783          */
784         err = sock_register(&inet6_family_ops);
785         if (err)
786                 goto out_sock_register_fail;
787
788         /* Initialise ipv6 mibs */
789         err = init_ipv6_mibs();
790         if (err)
791                 goto out_unregister_sock;
792
793         /*
794          *      ipngwg API draft makes clear that the correct semantics
795          *      for TCP and UDP is to consider one TCP and UDP instance
796          *      in a host availiable by both INET and INET6 APIs and
797          *      able to communicate via both network protocols.
798          */
799
800         err = register_pernet_subsys(&inet6_net_ops);
801         if (err)
802                 goto register_pernet_fail;
803
804 #ifdef CONFIG_SYSCTL
805         err = ipv6_sysctl_register();
806         if (err)
807                 goto sysctl_fail;
808 #endif
809         err = icmpv6_init(&inet6_family_ops);
810         if (err)
811                 goto icmp_fail;
812         err = ndisc_init(&inet6_family_ops);
813         if (err)
814                 goto ndisc_fail;
815         err = igmp6_init(&inet6_family_ops);
816         if (err)
817                 goto igmp_fail;
818         err = ipv6_netfilter_init();
819         if (err)
820                 goto netfilter_fail;
821         /* Create /proc/foo6 entries. */
822 #ifdef CONFIG_PROC_FS
823         err = -ENOMEM;
824         if (raw6_proc_init())
825                 goto proc_raw6_fail;
826         if (tcp6_proc_init())
827                 goto proc_tcp6_fail;
828         if (udp6_proc_init())
829                 goto proc_udp6_fail;
830         if (udplite6_proc_init())
831                 goto proc_udplite6_fail;
832         if (ipv6_misc_proc_init())
833                 goto proc_misc6_fail;
834
835         if (ac6_proc_init())
836                 goto proc_anycast6_fail;
837         if (if6_proc_init())
838                 goto proc_if6_fail;
839 #endif
840         err = ip6_route_init();
841         if (err)
842                 goto ip6_route_fail;
843         err = ip6_flowlabel_init();
844         if (err)
845                 goto ip6_flowlabel_fail;
846         err = addrconf_init();
847         if (err)
848                 goto addrconf_fail;
849
850         /* Init v6 extension headers. */
851         err = ipv6_exthdrs_init();
852         if (err)
853                 goto ipv6_exthdrs_fail;
854
855         err = ipv6_frag_init();
856         if (err)
857                 goto ipv6_frag_fail;
858
859         /* Init v6 transport protocols. */
860         err = udpv6_init();
861         if (err)
862                 goto udpv6_fail;
863
864         err = udplitev6_init();
865         if (err)
866                 goto udplitev6_fail;
867
868         err = tcpv6_init();
869         if (err)
870                 goto tcpv6_fail;
871
872         err = ipv6_packet_init();
873         if (err)
874                 goto ipv6_packet_fail;
875 out:
876         return err;
877
878 ipv6_packet_fail:
879         tcpv6_exit();
880 tcpv6_fail:
881         udplitev6_exit();
882 udplitev6_fail:
883         udpv6_exit();
884 udpv6_fail:
885         ipv6_frag_exit();
886 ipv6_frag_fail:
887         ipv6_exthdrs_exit();
888 ipv6_exthdrs_fail:
889         addrconf_cleanup();
890 addrconf_fail:
891         ip6_flowlabel_cleanup();
892 ip6_flowlabel_fail:
893         ip6_route_cleanup();
894 ip6_route_fail:
895 #ifdef CONFIG_PROC_FS
896         if6_proc_exit();
897 proc_if6_fail:
898         ac6_proc_exit();
899 proc_anycast6_fail:
900         ipv6_misc_proc_exit();
901 proc_misc6_fail:
902         udplite6_proc_exit();
903 proc_udplite6_fail:
904         udp6_proc_exit();
905 proc_udp6_fail:
906         tcp6_proc_exit();
907 proc_tcp6_fail:
908         raw6_proc_exit();
909 proc_raw6_fail:
910 #endif
911         ipv6_netfilter_fini();
912 netfilter_fail:
913         igmp6_cleanup();
914 igmp_fail:
915         ndisc_cleanup();
916 ndisc_fail:
917         icmpv6_cleanup();
918 icmp_fail:
919 #ifdef CONFIG_SYSCTL
920         ipv6_sysctl_unregister();
921 sysctl_fail:
922 #endif
923         unregister_pernet_subsys(&inet6_net_ops);
924 register_pernet_fail:
925         cleanup_ipv6_mibs();
926 out_unregister_sock:
927         sock_unregister(PF_INET6);
928         rtnl_unregister_all(PF_INET6);
929 out_sock_register_fail:
930         rawv6_exit();
931 out_unregister_raw_proto:
932         proto_unregister(&rawv6_prot);
933 out_unregister_udplite_proto:
934         proto_unregister(&udplitev6_prot);
935 out_unregister_udp_proto:
936         proto_unregister(&udpv6_prot);
937 out_unregister_tcp_proto:
938         proto_unregister(&tcpv6_prot);
939         goto out;
940 }
941 module_init(inet6_init);
942
943 static void __exit inet6_exit(void)
944 {
945         /* First of all disallow new sockets creation. */
946         sock_unregister(PF_INET6);
947         /* Disallow any further netlink messages */
948         rtnl_unregister_all(PF_INET6);
949
950         udpv6_exit();
951         udplitev6_exit();
952         tcpv6_exit();
953
954         /* Cleanup code parts. */
955         ipv6_packet_cleanup();
956         ipv6_frag_exit();
957         ipv6_exthdrs_exit();
958         addrconf_cleanup();
959         ip6_flowlabel_cleanup();
960         ip6_route_cleanup();
961 #ifdef CONFIG_PROC_FS
962
963         /* Cleanup code parts. */
964         if6_proc_exit();
965         ac6_proc_exit();
966         ipv6_misc_proc_exit();
967         udplite6_proc_exit();
968         udp6_proc_exit();
969         tcp6_proc_exit();
970         raw6_proc_exit();
971 #endif
972         ipv6_netfilter_fini();
973         igmp6_cleanup();
974         ndisc_cleanup();
975         icmpv6_cleanup();
976         rawv6_exit();
977 #ifdef CONFIG_SYSCTL
978         ipv6_sysctl_unregister();
979 #endif
980         unregister_pernet_subsys(&inet6_net_ops);
981         cleanup_ipv6_mibs();
982         proto_unregister(&rawv6_prot);
983         proto_unregister(&udplitev6_prot);
984         proto_unregister(&udpv6_prot);
985         proto_unregister(&tcpv6_prot);
986 }
987 module_exit(inet6_exit);
988
989 MODULE_ALIAS_NETPROTO(PF_INET6);