[UDP]: Allow users to configure UDP-Lite.
[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 /* 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(&init_net, 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(&init_net, &addr->sin6_addr,
316                                                    dev, 0)) {
317                                         if (dev)
318                                                 dev_put(dev);
319                                         err = -EADDRNOTAVAIL;
320                                         goto out;
321                                 }
322                         }
323                         if (dev)
324                                 dev_put(dev);
325                 }
326         }
327
328         inet->rcv_saddr = v4addr;
329         inet->saddr = v4addr;
330
331         ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
332
333         if (!(addr_type & IPV6_ADDR_MULTICAST))
334                 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
335
336         /* Make sure we are allowed to bind here. */
337         if (sk->sk_prot->get_port(sk, snum)) {
338                 inet_reset_saddr(sk);
339                 err = -EADDRINUSE;
340                 goto out;
341         }
342
343         if (addr_type != IPV6_ADDR_ANY)
344                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
345         if (snum)
346                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
347         inet->sport = htons(inet->num);
348         inet->dport = 0;
349         inet->daddr = 0;
350 out:
351         release_sock(sk);
352         return err;
353 }
354
355 EXPORT_SYMBOL(inet6_bind);
356
357 int inet6_release(struct socket *sock)
358 {
359         struct sock *sk = sock->sk;
360
361         if (sk == NULL)
362                 return -EINVAL;
363
364         /* Free mc lists */
365         ipv6_sock_mc_close(sk);
366
367         /* Free ac lists */
368         ipv6_sock_ac_close(sk);
369
370         return inet_release(sock);
371 }
372
373 EXPORT_SYMBOL(inet6_release);
374
375 int inet6_destroy_sock(struct sock *sk)
376 {
377         struct ipv6_pinfo *np = inet6_sk(sk);
378         struct sk_buff *skb;
379         struct ipv6_txoptions *opt;
380
381         /* Release rx options */
382
383         if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
384                 kfree_skb(skb);
385
386         /* Free flowlabels */
387         fl6_free_socklist(sk);
388
389         /* Free tx options */
390
391         if ((opt = xchg(&np->opt, NULL)) != NULL)
392                 sock_kfree_s(sk, opt, opt->tot_len);
393
394         return 0;
395 }
396
397 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
398
399 /*
400  *      This does both peername and sockname.
401  */
402
403 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
404                  int *uaddr_len, int peer)
405 {
406         struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
407         struct sock *sk = sock->sk;
408         struct inet_sock *inet = inet_sk(sk);
409         struct ipv6_pinfo *np = inet6_sk(sk);
410
411         sin->sin6_family = AF_INET6;
412         sin->sin6_flowinfo = 0;
413         sin->sin6_scope_id = 0;
414         if (peer) {
415                 if (!inet->dport)
416                         return -ENOTCONN;
417                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
418                     peer == 1)
419                         return -ENOTCONN;
420                 sin->sin6_port = inet->dport;
421                 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
422                 if (np->sndflow)
423                         sin->sin6_flowinfo = np->flow_label;
424         } else {
425                 if (ipv6_addr_any(&np->rcv_saddr))
426                         ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
427                 else
428                         ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
429
430                 sin->sin6_port = inet->sport;
431         }
432         if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
433                 sin->sin6_scope_id = sk->sk_bound_dev_if;
434         *uaddr_len = sizeof(*sin);
435         return(0);
436 }
437
438 EXPORT_SYMBOL(inet6_getname);
439
440 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
441 {
442         struct sock *sk = sock->sk;
443
444         switch(cmd)
445         {
446         case SIOCGSTAMP:
447                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
448
449         case SIOCGSTAMPNS:
450                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
451
452         case SIOCADDRT:
453         case SIOCDELRT:
454
455                 return(ipv6_route_ioctl(cmd,(void __user *)arg));
456
457         case SIOCSIFADDR:
458                 return addrconf_add_ifaddr((void __user *) arg);
459         case SIOCDIFADDR:
460                 return addrconf_del_ifaddr((void __user *) arg);
461         case SIOCSIFDSTADDR:
462                 return addrconf_set_dstaddr((void __user *) arg);
463         default:
464                 if (!sk->sk_prot->ioctl)
465                         return -ENOIOCTLCMD;
466                 return sk->sk_prot->ioctl(sk, cmd, arg);
467         }
468         /*NOTREACHED*/
469         return(0);
470 }
471
472 EXPORT_SYMBOL(inet6_ioctl);
473
474 const struct proto_ops inet6_stream_ops = {
475         .family            = PF_INET6,
476         .owner             = THIS_MODULE,
477         .release           = inet6_release,
478         .bind              = inet6_bind,
479         .connect           = inet_stream_connect,       /* ok           */
480         .socketpair        = sock_no_socketpair,        /* a do nothing */
481         .accept            = inet_accept,               /* ok           */
482         .getname           = inet6_getname,
483         .poll              = tcp_poll,                  /* ok           */
484         .ioctl             = inet6_ioctl,               /* must change  */
485         .listen            = inet_listen,               /* ok           */
486         .shutdown          = inet_shutdown,             /* ok           */
487         .setsockopt        = sock_common_setsockopt,    /* ok           */
488         .getsockopt        = sock_common_getsockopt,    /* ok           */
489         .sendmsg           = tcp_sendmsg,               /* ok           */
490         .recvmsg           = sock_common_recvmsg,       /* ok           */
491         .mmap              = sock_no_mmap,
492         .sendpage          = tcp_sendpage,
493         .splice_read       = tcp_splice_read,
494 #ifdef CONFIG_COMPAT
495         .compat_setsockopt = compat_sock_common_setsockopt,
496         .compat_getsockopt = compat_sock_common_getsockopt,
497 #endif
498 };
499
500 const struct proto_ops inet6_dgram_ops = {
501         .family            = PF_INET6,
502         .owner             = THIS_MODULE,
503         .release           = inet6_release,
504         .bind              = inet6_bind,
505         .connect           = inet_dgram_connect,        /* ok           */
506         .socketpair        = sock_no_socketpair,        /* a do nothing */
507         .accept            = sock_no_accept,            /* a do nothing */
508         .getname           = inet6_getname,
509         .poll              = udp_poll,                  /* ok           */
510         .ioctl             = inet6_ioctl,               /* must change  */
511         .listen            = sock_no_listen,            /* ok           */
512         .shutdown          = inet_shutdown,             /* ok           */
513         .setsockopt        = sock_common_setsockopt,    /* ok           */
514         .getsockopt        = sock_common_getsockopt,    /* ok           */
515         .sendmsg           = inet_sendmsg,              /* ok           */
516         .recvmsg           = sock_common_recvmsg,       /* ok           */
517         .mmap              = sock_no_mmap,
518         .sendpage          = sock_no_sendpage,
519 #ifdef CONFIG_COMPAT
520         .compat_setsockopt = compat_sock_common_setsockopt,
521         .compat_getsockopt = compat_sock_common_getsockopt,
522 #endif
523 };
524
525 static struct net_proto_family inet6_family_ops = {
526         .family = PF_INET6,
527         .create = inet6_create,
528         .owner  = THIS_MODULE,
529 };
530
531 int inet6_register_protosw(struct inet_protosw *p)
532 {
533         struct list_head *lh;
534         struct inet_protosw *answer;
535         struct list_head *last_perm;
536         int protocol = p->protocol;
537         int ret;
538
539         spin_lock_bh(&inetsw6_lock);
540
541         ret = -EINVAL;
542         if (p->type >= SOCK_MAX)
543                 goto out_illegal;
544
545         /* If we are trying to override a permanent protocol, bail. */
546         answer = NULL;
547         ret = -EPERM;
548         last_perm = &inetsw6[p->type];
549         list_for_each(lh, &inetsw6[p->type]) {
550                 answer = list_entry(lh, struct inet_protosw, list);
551
552                 /* Check only the non-wild match. */
553                 if (INET_PROTOSW_PERMANENT & answer->flags) {
554                         if (protocol == answer->protocol)
555                                 break;
556                         last_perm = lh;
557                 }
558
559                 answer = NULL;
560         }
561         if (answer)
562                 goto out_permanent;
563
564         /* Add the new entry after the last permanent entry if any, so that
565          * the new entry does not override a permanent entry when matched with
566          * a wild-card protocol. But it is allowed to override any existing
567          * non-permanent entry.  This means that when we remove this entry, the
568          * system automatically returns to the old behavior.
569          */
570         list_add_rcu(&p->list, last_perm);
571         ret = 0;
572 out:
573         spin_unlock_bh(&inetsw6_lock);
574         return ret;
575
576 out_permanent:
577         printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
578                protocol);
579         goto out;
580
581 out_illegal:
582         printk(KERN_ERR
583                "Ignoring attempt to register invalid socket type %d.\n",
584                p->type);
585         goto out;
586 }
587
588 EXPORT_SYMBOL(inet6_register_protosw);
589
590 void
591 inet6_unregister_protosw(struct inet_protosw *p)
592 {
593         if (INET_PROTOSW_PERMANENT & p->flags) {
594                 printk(KERN_ERR
595                        "Attempt to unregister permanent protocol %d.\n",
596                        p->protocol);
597         } else {
598                 spin_lock_bh(&inetsw6_lock);
599                 list_del_rcu(&p->list);
600                 spin_unlock_bh(&inetsw6_lock);
601
602                 synchronize_net();
603         }
604 }
605
606 EXPORT_SYMBOL(inet6_unregister_protosw);
607
608 int inet6_sk_rebuild_header(struct sock *sk)
609 {
610         int err;
611         struct dst_entry *dst;
612         struct ipv6_pinfo *np = inet6_sk(sk);
613
614         dst = __sk_dst_check(sk, np->dst_cookie);
615
616         if (dst == NULL) {
617                 struct inet_sock *inet = inet_sk(sk);
618                 struct in6_addr *final_p = NULL, final;
619                 struct flowi fl;
620
621                 memset(&fl, 0, sizeof(fl));
622                 fl.proto = sk->sk_protocol;
623                 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
624                 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
625                 fl.fl6_flowlabel = np->flow_label;
626                 fl.oif = sk->sk_bound_dev_if;
627                 fl.fl_ip_dport = inet->dport;
628                 fl.fl_ip_sport = inet->sport;
629                 security_sk_classify_flow(sk, &fl);
630
631                 if (np->opt && np->opt->srcrt) {
632                         struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
633                         ipv6_addr_copy(&final, &fl.fl6_dst);
634                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
635                         final_p = &final;
636                 }
637
638                 err = ip6_dst_lookup(sk, &dst, &fl);
639                 if (err) {
640                         sk->sk_route_caps = 0;
641                         return err;
642                 }
643                 if (final_p)
644                         ipv6_addr_copy(&fl.fl6_dst, final_p);
645
646                 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
647                         sk->sk_err_soft = -err;
648                         return err;
649                 }
650
651                 __ip6_dst_store(sk, dst, NULL, NULL);
652         }
653
654         return 0;
655 }
656
657 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
658
659 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
660 {
661         struct ipv6_pinfo *np = inet6_sk(sk);
662         struct inet6_skb_parm *opt = IP6CB(skb);
663
664         if (np->rxopt.all) {
665                 if ((opt->hop && (np->rxopt.bits.hopopts ||
666                                   np->rxopt.bits.ohopopts)) ||
667                     ((IPV6_FLOWINFO_MASK &
668                       *(__be32 *)skb_network_header(skb)) &&
669                      np->rxopt.bits.rxflow) ||
670                     (opt->srcrt && (np->rxopt.bits.srcrt ||
671                      np->rxopt.bits.osrcrt)) ||
672                     ((opt->dst1 || opt->dst0) &&
673                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
674                         return 1;
675         }
676         return 0;
677 }
678
679 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
680
681 static int __init init_ipv6_mibs(void)
682 {
683         if (snmp_mib_init((void **)ipv6_statistics,
684                           sizeof(struct ipstats_mib)) < 0)
685                 goto err_ip_mib;
686         if (snmp_mib_init((void **)icmpv6_statistics,
687                           sizeof(struct icmpv6_mib)) < 0)
688                 goto err_icmp_mib;
689         if (snmp_mib_init((void **)icmpv6msg_statistics,
690                           sizeof(struct icmpv6msg_mib)) < 0)
691                 goto err_icmpmsg_mib;
692         if (snmp_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib)) < 0)
693                 goto err_udp_mib;
694 #ifdef CONFIG_IP_UDPLITE
695         if (snmp_mib_init((void **)udplite_stats_in6,
696                           sizeof (struct udp_mib)) < 0)
697                 goto err_udplite_mib;
698 #endif
699         return 0;
700
701 #ifdef CONFIG_IP_UDPLITE
702 err_udplite_mib:
703 #endif
704         snmp_mib_free((void **)udp_stats_in6);
705 err_udp_mib:
706         snmp_mib_free((void **)icmpv6msg_statistics);
707 err_icmpmsg_mib:
708         snmp_mib_free((void **)icmpv6_statistics);
709 err_icmp_mib:
710         snmp_mib_free((void **)ipv6_statistics);
711 err_ip_mib:
712         return -ENOMEM;
713
714 }
715
716 static void cleanup_ipv6_mibs(void)
717 {
718         snmp_mib_free((void **)ipv6_statistics);
719         snmp_mib_free((void **)icmpv6_statistics);
720         snmp_mib_free((void **)icmpv6msg_statistics);
721         snmp_mib_free((void **)udp_stats_in6);
722 #ifdef CONFIG_IP_UDPLITE
723         snmp_mib_free((void **)udplite_stats_in6);
724 #endif
725 }
726
727 static int inet6_net_init(struct net *net)
728 {
729         net->ipv6.sysctl.bindv6only = 0;
730         net->ipv6.sysctl.flush_delay = 0;
731         net->ipv6.sysctl.ip6_rt_max_size = 4096;
732         net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
733         net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
734         net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
735         net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
736         net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
737         net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
738         net->ipv6.sysctl.icmpv6_time = 1*HZ;
739
740         return 0;
741 }
742
743 static void inet6_net_exit(struct net *net)
744 {
745         return;
746 }
747
748 static struct pernet_operations inet6_net_ops = {
749         .init = inet6_net_init,
750         .exit = inet6_net_exit,
751 };
752
753 static int __init inet6_init(void)
754 {
755         struct sk_buff *dummy_skb;
756         struct list_head *r;
757         int err;
758
759         BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
760
761         err = proto_register(&tcpv6_prot, 1);
762         if (err)
763                 goto out;
764
765         err = proto_register(&udpv6_prot, 1);
766         if (err)
767                 goto out_unregister_tcp_proto;
768
769 #ifdef CONFIG_IP_UDPLITE
770         err = proto_register(&udplitev6_prot, 1);
771         if (err)
772                 goto out_unregister_udp_proto;
773 #endif
774
775         err = proto_register(&rawv6_prot, 1);
776         if (err)
777                 goto out_unregister_udplite_proto;
778
779
780         /* Register the socket-side information for inet6_create.  */
781         for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
782                 INIT_LIST_HEAD(r);
783
784         /* We MUST register RAW sockets before we create the ICMP6,
785          * IGMP6, or NDISC control sockets.
786          */
787         err = rawv6_init();
788         if (err)
789                 goto out_unregister_raw_proto;
790
791         /* Register the family here so that the init calls below will
792          * be able to create sockets. (?? is this dangerous ??)
793          */
794         err = sock_register(&inet6_family_ops);
795         if (err)
796                 goto out_sock_register_fail;
797
798         /* Initialise ipv6 mibs */
799         err = init_ipv6_mibs();
800         if (err)
801                 goto out_unregister_sock;
802
803         /*
804          *      ipngwg API draft makes clear that the correct semantics
805          *      for TCP and UDP is to consider one TCP and UDP instance
806          *      in a host availiable by both INET and INET6 APIs and
807          *      able to communicate via both network protocols.
808          */
809
810         err = register_pernet_subsys(&inet6_net_ops);
811         if (err)
812                 goto register_pernet_fail;
813
814 #ifdef CONFIG_SYSCTL
815         err = ipv6_sysctl_register();
816         if (err)
817                 goto sysctl_fail;
818 #endif
819         err = icmpv6_init();
820         if (err)
821                 goto icmp_fail;
822         err = ndisc_init();
823         if (err)
824                 goto ndisc_fail;
825         err = igmp6_init();
826         if (err)
827                 goto igmp_fail;
828         err = ipv6_netfilter_init();
829         if (err)
830                 goto netfilter_fail;
831         /* Create /proc/foo6 entries. */
832 #ifdef CONFIG_PROC_FS
833         err = -ENOMEM;
834         if (raw6_proc_init())
835                 goto proc_raw6_fail;
836         if (tcp6_proc_init())
837                 goto proc_tcp6_fail;
838         if (udp6_proc_init())
839                 goto proc_udp6_fail;
840         if (udplite6_proc_init())
841                 goto proc_udplite6_fail;
842         if (ipv6_misc_proc_init())
843                 goto proc_misc6_fail;
844
845         if (ac6_proc_init())
846                 goto proc_anycast6_fail;
847         if (if6_proc_init())
848                 goto proc_if6_fail;
849 #endif
850         err = ip6_route_init();
851         if (err)
852                 goto ip6_route_fail;
853         err = ip6_flowlabel_init();
854         if (err)
855                 goto ip6_flowlabel_fail;
856         err = addrconf_init();
857         if (err)
858                 goto addrconf_fail;
859
860         /* Init v6 extension headers. */
861         err = ipv6_exthdrs_init();
862         if (err)
863                 goto ipv6_exthdrs_fail;
864
865         err = ipv6_frag_init();
866         if (err)
867                 goto ipv6_frag_fail;
868
869         /* Init v6 transport protocols. */
870         err = udpv6_init();
871         if (err)
872                 goto udpv6_fail;
873
874         err = udplitev6_init();
875         if (err)
876                 goto udplitev6_fail;
877
878         err = tcpv6_init();
879         if (err)
880                 goto tcpv6_fail;
881
882         err = ipv6_packet_init();
883         if (err)
884                 goto ipv6_packet_fail;
885 out:
886         return err;
887
888 ipv6_packet_fail:
889         tcpv6_exit();
890 tcpv6_fail:
891         udplitev6_exit();
892 udplitev6_fail:
893         udpv6_exit();
894 udpv6_fail:
895         ipv6_frag_exit();
896 ipv6_frag_fail:
897         ipv6_exthdrs_exit();
898 ipv6_exthdrs_fail:
899         addrconf_cleanup();
900 addrconf_fail:
901         ip6_flowlabel_cleanup();
902 ip6_flowlabel_fail:
903         ip6_route_cleanup();
904 ip6_route_fail:
905 #ifdef CONFIG_PROC_FS
906         if6_proc_exit();
907 proc_if6_fail:
908         ac6_proc_exit();
909 proc_anycast6_fail:
910         ipv6_misc_proc_exit();
911 proc_misc6_fail:
912         udplite6_proc_exit();
913 proc_udplite6_fail:
914         udp6_proc_exit();
915 proc_udp6_fail:
916         tcp6_proc_exit();
917 proc_tcp6_fail:
918         raw6_proc_exit();
919 proc_raw6_fail:
920 #endif
921         ipv6_netfilter_fini();
922 netfilter_fail:
923         igmp6_cleanup();
924 igmp_fail:
925         ndisc_cleanup();
926 ndisc_fail:
927         icmpv6_cleanup();
928 icmp_fail:
929 #ifdef CONFIG_SYSCTL
930         ipv6_sysctl_unregister();
931 sysctl_fail:
932 #endif
933         unregister_pernet_subsys(&inet6_net_ops);
934 register_pernet_fail:
935         cleanup_ipv6_mibs();
936 out_unregister_sock:
937         sock_unregister(PF_INET6);
938         rtnl_unregister_all(PF_INET6);
939 out_sock_register_fail:
940         rawv6_exit();
941 out_unregister_raw_proto:
942         proto_unregister(&rawv6_prot);
943 out_unregister_udplite_proto:
944 #ifdef CONFIG_IP_UDPLITE
945         proto_unregister(&udplitev6_prot);
946 out_unregister_udp_proto:
947 #endif
948         proto_unregister(&udpv6_prot);
949 out_unregister_tcp_proto:
950         proto_unregister(&tcpv6_prot);
951         goto out;
952 }
953 module_init(inet6_init);
954
955 static void __exit inet6_exit(void)
956 {
957         /* First of all disallow new sockets creation. */
958         sock_unregister(PF_INET6);
959         /* Disallow any further netlink messages */
960         rtnl_unregister_all(PF_INET6);
961
962         udpv6_exit();
963 #ifdef CONFIG_IP_UDPLITE
964         udplitev6_exit();
965 #endif
966         tcpv6_exit();
967
968         /* Cleanup code parts. */
969         ipv6_packet_cleanup();
970         ipv6_frag_exit();
971         ipv6_exthdrs_exit();
972         addrconf_cleanup();
973         ip6_flowlabel_cleanup();
974         ip6_route_cleanup();
975 #ifdef CONFIG_PROC_FS
976
977         /* Cleanup code parts. */
978         if6_proc_exit();
979         ac6_proc_exit();
980         ipv6_misc_proc_exit();
981         udplite6_proc_exit();
982         udp6_proc_exit();
983         tcp6_proc_exit();
984         raw6_proc_exit();
985 #endif
986         ipv6_netfilter_fini();
987         igmp6_cleanup();
988         ndisc_cleanup();
989         icmpv6_cleanup();
990         rawv6_exit();
991 #ifdef CONFIG_SYSCTL
992         ipv6_sysctl_unregister();
993 #endif
994         unregister_pernet_subsys(&inet6_net_ops);
995         cleanup_ipv6_mibs();
996         proto_unregister(&rawv6_prot);
997 #ifdef CONFIG_IP_UDPLITE
998         proto_unregister(&udplitev6_prot);
999 #endif
1000         proto_unregister(&udpv6_prot);
1001         proto_unregister(&tcpv6_prot);
1002 }
1003 module_exit(inet6_exit);
1004
1005 MODULE_ALIAS_NETPROTO(PF_INET6);