blob: e19457fe4f6edb79ef059dbf88f93ed1836bc8d9 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Randy Dunlap4fc268d2006-01-11 12:17:47 -080025#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include <linux/config.h>
27#include <linux/errno.h>
28#include <linux/types.h>
29#include <linux/socket.h>
30#include <linux/in.h>
31#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include <linux/sched.h>
33#include <linux/timer.h>
34#include <linux/string.h>
35#include <linux/sockios.h>
36#include <linux/net.h>
37#include <linux/fcntl.h>
38#include <linux/mm.h>
39#include <linux/interrupt.h>
40#include <linux/proc_fs.h>
41#include <linux/stat.h>
42#include <linux/init.h>
43
44#include <linux/inet.h>
45#include <linux/netdevice.h>
46#include <linux/icmpv6.h>
47#include <linux/smp_lock.h>
Harald Welte2cc7d572005-08-09 19:42:34 -070048#include <linux/netfilter_ipv6.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070049
50#include <net/ip.h>
51#include <net/ipv6.h>
52#include <net/udp.h>
53#include <net/tcp.h>
54#include <net/ipip.h>
55#include <net/protocol.h>
56#include <net/inet_common.h>
57#include <net/transp_v6.h>
58#include <net/ip6_route.h>
59#include <net/addrconf.h>
60#ifdef CONFIG_IPV6_TUNNEL
61#include <net/ip6_tunnel.h>
62#endif
63
64#include <asm/uaccess.h>
65#include <asm/system.h>
66
67MODULE_AUTHOR("Cast of dozens");
68MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
69MODULE_LICENSE("GPL");
70
Linus Torvalds1da177e2005-04-16 15:20:36 -070071int sysctl_ipv6_bindv6only;
72
Linus Torvalds1da177e2005-04-16 15:20:36 -070073/* The inetsw table contains everything that inet_create needs to
74 * build a new socket.
75 */
76static struct list_head inetsw6[SOCK_MAX];
77static DEFINE_SPINLOCK(inetsw6_lock);
78
Linus Torvalds1da177e2005-04-16 15:20:36 -070079static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
80{
81 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
82
83 return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
84}
85
86static int inet6_create(struct socket *sock, int protocol)
87{
88 struct inet_sock *inet;
89 struct ipv6_pinfo *np;
90 struct sock *sk;
91 struct list_head *p;
92 struct inet_protosw *answer;
93 struct proto *answer_prot;
94 unsigned char answer_flags;
95 char answer_no_check;
YOSHIFUJI Hideakiaf1afe82005-12-02 20:56:57 -080096 int try_loading_module = 0;
97 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -070098
99 /* Look for the requested type/protocol pair. */
100 answer = NULL;
YOSHIFUJI Hideakiaf1afe82005-12-02 20:56:57 -0800101lookup_protocol:
102 err = -ESOCKTNOSUPPORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 rcu_read_lock();
104 list_for_each_rcu(p, &inetsw6[sock->type]) {
105 answer = list_entry(p, struct inet_protosw, list);
106
107 /* Check the non-wild match. */
108 if (protocol == answer->protocol) {
109 if (protocol != IPPROTO_IP)
110 break;
111 } else {
112 /* Check for the two wild cases. */
113 if (IPPROTO_IP == protocol) {
114 protocol = answer->protocol;
115 break;
116 }
117 if (IPPROTO_IP == answer->protocol)
118 break;
119 }
YOSHIFUJI Hideakiaf1afe82005-12-02 20:56:57 -0800120 err = -EPROTONOSUPPORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 answer = NULL;
122 }
123
YOSHIFUJI Hideakiaf1afe82005-12-02 20:56:57 -0800124 if (!answer) {
125 if (try_loading_module < 2) {
126 rcu_read_unlock();
127 /*
128 * Be more specific, e.g. net-pf-10-proto-132-type-1
129 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
130 */
131 if (++try_loading_module == 1)
132 request_module("net-pf-%d-proto-%d-type-%d",
133 PF_INET6, protocol, sock->type);
134 /*
135 * Fall back to generic, e.g. net-pf-10-proto-132
136 * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
137 */
138 else
139 request_module("net-pf-%d-proto-%d",
140 PF_INET6, protocol);
141 goto lookup_protocol;
142 } else
143 goto out_rcu_unlock;
144 }
145
146 err = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 if (answer->capability > 0 && !capable(answer->capability))
148 goto out_rcu_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149
150 sock->ops = answer->ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 answer_prot = answer->prot;
152 answer_no_check = answer->no_check;
153 answer_flags = answer->flags;
154 rcu_read_unlock();
155
156 BUG_TRAP(answer_prot->slab != NULL);
157
YOSHIFUJI Hideakiaf1afe82005-12-02 20:56:57 -0800158 err = -ENOBUFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 sk = sk_alloc(PF_INET6, GFP_KERNEL, answer_prot, 1);
160 if (sk == NULL)
161 goto out;
162
163 sock_init_data(sock, sk);
164
YOSHIFUJI Hideakiaf1afe82005-12-02 20:56:57 -0800165 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 sk->sk_no_check = answer_no_check;
167 if (INET_PROTOSW_REUSE & answer_flags)
168 sk->sk_reuse = 1;
169
170 inet = inet_sk(sk);
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800171 inet->is_icsk = INET_PROTOSW_ICSK & answer_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172
173 if (SOCK_RAW == sock->type) {
174 inet->num = protocol;
175 if (IPPROTO_RAW == protocol)
176 inet->hdrincl = 1;
177 }
178
Arnaldo Carvalho de Meloe6848972005-08-09 19:45:38 -0700179 sk->sk_destruct = inet_sock_destruct;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 sk->sk_family = PF_INET6;
181 sk->sk_protocol = protocol;
182
183 sk->sk_backlog_rcv = answer->prot->backlog_rcv;
184
185 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
186 np->hop_limit = -1;
187 np->mcast_hops = -1;
188 np->mc_loop = 1;
189 np->pmtudisc = IPV6_PMTUDISC_WANT;
190 np->ipv6only = sysctl_ipv6_bindv6only;
191
192 /* Init the ipv4 part of the socket since we can have sockets
193 * using v6 API for ipv4.
194 */
195 inet->uc_ttl = -1;
196
197 inet->mc_loop = 1;
198 inet->mc_ttl = 1;
199 inet->mc_index = 0;
200 inet->mc_list = NULL;
201
202 if (ipv4_config.no_pmtu_disc)
203 inet->pmtudisc = IP_PMTUDISC_DONT;
204 else
205 inet->pmtudisc = IP_PMTUDISC_WANT;
Arnaldo Carvalho de Meloe6848972005-08-09 19:45:38 -0700206 /*
207 * Increment only the relevant sk_prot->socks debug field, this changes
208 * the previous behaviour of incrementing both the equivalent to
209 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
210 *
211 * This allows better debug granularity as we'll know exactly how many
212 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
213 * transport protocol socks. -acme
214 */
215 sk_refcnt_debug_inc(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 if (inet->num) {
218 /* It assumes that any protocol which allows
219 * the user to assign a number at socket
220 * creation time automatically shares.
221 */
222 inet->sport = ntohs(inet->num);
223 sk->sk_prot->hash(sk);
224 }
225 if (sk->sk_prot->init) {
YOSHIFUJI Hideakiaf1afe82005-12-02 20:56:57 -0800226 err = sk->sk_prot->init(sk);
227 if (err) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 sk_common_release(sk);
229 goto out;
230 }
231 }
232out:
YOSHIFUJI Hideakiaf1afe82005-12-02 20:56:57 -0800233 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234out_rcu_unlock:
235 rcu_read_unlock();
236 goto out;
237}
238
239
240/* bind for INET6 API */
241int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
242{
243 struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
244 struct sock *sk = sock->sk;
245 struct inet_sock *inet = inet_sk(sk);
246 struct ipv6_pinfo *np = inet6_sk(sk);
247 __u32 v4addr = 0;
248 unsigned short snum;
249 int addr_type = 0;
250 int err = 0;
251
252 /* If the socket has its own bind function then use it. */
253 if (sk->sk_prot->bind)
254 return sk->sk_prot->bind(sk, uaddr, addr_len);
255
256 if (addr_len < SIN6_LEN_RFC2133)
257 return -EINVAL;
258 addr_type = ipv6_addr_type(&addr->sin6_addr);
259 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
260 return -EINVAL;
261
262 snum = ntohs(addr->sin6_port);
263 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
264 return -EACCES;
265
266 lock_sock(sk);
267
268 /* Check these errors (active socket, double bind). */
269 if (sk->sk_state != TCP_CLOSE || inet->num) {
270 err = -EINVAL;
271 goto out;
272 }
273
274 /* Check if the address belongs to the host. */
275 if (addr_type == IPV6_ADDR_MAPPED) {
276 v4addr = addr->sin6_addr.s6_addr32[3];
277 if (inet_addr_type(v4addr) != RTN_LOCAL) {
278 err = -EADDRNOTAVAIL;
279 goto out;
280 }
281 } else {
282 if (addr_type != IPV6_ADDR_ANY) {
283 struct net_device *dev = NULL;
284
285 if (addr_type & IPV6_ADDR_LINKLOCAL) {
286 if (addr_len >= sizeof(struct sockaddr_in6) &&
287 addr->sin6_scope_id) {
288 /* Override any existing binding, if another one
289 * is supplied by user.
290 */
291 sk->sk_bound_dev_if = addr->sin6_scope_id;
292 }
293
294 /* Binding to link-local address requires an interface */
295 if (!sk->sk_bound_dev_if) {
296 err = -EINVAL;
297 goto out;
298 }
299 dev = dev_get_by_index(sk->sk_bound_dev_if);
300 if (!dev) {
301 err = -ENODEV;
302 goto out;
303 }
304 }
305
306 /* ipv4 addr of the socket is invalid. Only the
307 * unspecified and mapped address have a v4 equivalent.
308 */
309 v4addr = LOOPBACK4_IPV6;
310 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
311 if (!ipv6_chk_addr(&addr->sin6_addr, dev, 0)) {
312 if (dev)
313 dev_put(dev);
314 err = -EADDRNOTAVAIL;
315 goto out;
316 }
317 }
318 if (dev)
319 dev_put(dev);
320 }
321 }
322
323 inet->rcv_saddr = v4addr;
324 inet->saddr = v4addr;
325
326 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
327
328 if (!(addr_type & IPV6_ADDR_MULTICAST))
329 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
330
331 /* Make sure we are allowed to bind here. */
332 if (sk->sk_prot->get_port(sk, snum)) {
333 inet_reset_saddr(sk);
334 err = -EADDRINUSE;
335 goto out;
336 }
337
338 if (addr_type != IPV6_ADDR_ANY)
339 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
340 if (snum)
341 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
342 inet->sport = ntohs(inet->num);
343 inet->dport = 0;
344 inet->daddr = 0;
345out:
346 release_sock(sk);
347 return err;
348}
349
350int inet6_release(struct socket *sock)
351{
352 struct sock *sk = sock->sk;
353
354 if (sk == NULL)
355 return -EINVAL;
356
357 /* Free mc lists */
358 ipv6_sock_mc_close(sk);
359
360 /* Free ac lists */
361 ipv6_sock_ac_close(sk);
362
363 return inet_release(sock);
364}
365
366int inet6_destroy_sock(struct sock *sk)
367{
368 struct ipv6_pinfo *np = inet6_sk(sk);
369 struct sk_buff *skb;
370 struct ipv6_txoptions *opt;
371
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 /* Release rx options */
373
374 if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
375 kfree_skb(skb);
376
377 /* Free flowlabels */
378 fl6_free_socklist(sk);
379
380 /* Free tx options */
381
382 if ((opt = xchg(&np->opt, NULL)) != NULL)
383 sock_kfree_s(sk, opt, opt->tot_len);
384
385 return 0;
386}
387
Arnaldo Carvalho de Melo3cf3dc62005-12-13 23:23:20 -0800388EXPORT_SYMBOL_GPL(inet6_destroy_sock);
389
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390/*
391 * This does both peername and sockname.
392 */
393
394int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
395 int *uaddr_len, int peer)
396{
397 struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
398 struct sock *sk = sock->sk;
399 struct inet_sock *inet = inet_sk(sk);
400 struct ipv6_pinfo *np = inet6_sk(sk);
401
402 sin->sin6_family = AF_INET6;
403 sin->sin6_flowinfo = 0;
404 sin->sin6_scope_id = 0;
405 if (peer) {
406 if (!inet->dport)
407 return -ENOTCONN;
408 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
409 peer == 1)
410 return -ENOTCONN;
411 sin->sin6_port = inet->dport;
412 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
413 if (np->sndflow)
414 sin->sin6_flowinfo = np->flow_label;
415 } else {
416 if (ipv6_addr_any(&np->rcv_saddr))
417 ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
418 else
419 ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
420
421 sin->sin6_port = inet->sport;
422 }
423 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
424 sin->sin6_scope_id = sk->sk_bound_dev_if;
425 *uaddr_len = sizeof(*sin);
426 return(0);
427}
428
429int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
430{
431 struct sock *sk = sock->sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432
433 switch(cmd)
434 {
435 case SIOCGSTAMP:
436 return sock_get_timestamp(sk, (struct timeval __user *)arg);
437
438 case SIOCADDRT:
439 case SIOCDELRT:
440
441 return(ipv6_route_ioctl(cmd,(void __user *)arg));
442
443 case SIOCSIFADDR:
444 return addrconf_add_ifaddr((void __user *) arg);
445 case SIOCDIFADDR:
446 return addrconf_del_ifaddr((void __user *) arg);
447 case SIOCSIFDSTADDR:
448 return addrconf_set_dstaddr((void __user *) arg);
449 default:
Christoph Hellwigb5e5fa52006-01-03 14:18:33 -0800450 if (!sk->sk_prot->ioctl)
451 return -ENOIOCTLCMD;
452 return sk->sk_prot->ioctl(sk, cmd, arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 }
454 /*NOTREACHED*/
455 return(0);
456}
457
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800458const struct proto_ops inet6_stream_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800459 .family = PF_INET6,
460 .owner = THIS_MODULE,
461 .release = inet6_release,
462 .bind = inet6_bind,
463 .connect = inet_stream_connect, /* ok */
464 .socketpair = sock_no_socketpair, /* a do nothing */
465 .accept = inet_accept, /* ok */
466 .getname = inet6_getname,
467 .poll = tcp_poll, /* ok */
468 .ioctl = inet6_ioctl, /* must change */
469 .listen = inet_listen, /* ok */
470 .shutdown = inet_shutdown, /* ok */
471 .setsockopt = sock_common_setsockopt, /* ok */
472 .getsockopt = sock_common_getsockopt, /* ok */
473 .sendmsg = inet_sendmsg, /* ok */
474 .recvmsg = sock_common_recvmsg, /* ok */
475 .mmap = sock_no_mmap,
476 .sendpage = tcp_sendpage,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800477#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800478 .compat_setsockopt = compat_sock_common_setsockopt,
479 .compat_getsockopt = compat_sock_common_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800480#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481};
482
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800483const struct proto_ops inet6_dgram_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800484 .family = PF_INET6,
485 .owner = THIS_MODULE,
486 .release = inet6_release,
487 .bind = inet6_bind,
488 .connect = inet_dgram_connect, /* ok */
489 .socketpair = sock_no_socketpair, /* a do nothing */
490 .accept = sock_no_accept, /* a do nothing */
491 .getname = inet6_getname,
492 .poll = udp_poll, /* ok */
493 .ioctl = inet6_ioctl, /* must change */
494 .listen = sock_no_listen, /* ok */
495 .shutdown = inet_shutdown, /* ok */
496 .setsockopt = sock_common_setsockopt, /* ok */
497 .getsockopt = sock_common_getsockopt, /* ok */
498 .sendmsg = inet_sendmsg, /* ok */
499 .recvmsg = sock_common_recvmsg, /* ok */
500 .mmap = sock_no_mmap,
501 .sendpage = sock_no_sendpage,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800502#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800503 .compat_setsockopt = compat_sock_common_setsockopt,
504 .compat_getsockopt = compat_sock_common_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800505#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506};
507
508static struct net_proto_family inet6_family_ops = {
509 .family = PF_INET6,
510 .create = inet6_create,
511 .owner = THIS_MODULE,
512};
513
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514/* Same as inet6_dgram_ops, sans udp_poll. */
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800515static const struct proto_ops inet6_sockraw_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800516 .family = PF_INET6,
517 .owner = THIS_MODULE,
518 .release = inet6_release,
519 .bind = inet6_bind,
520 .connect = inet_dgram_connect, /* ok */
521 .socketpair = sock_no_socketpair, /* a do nothing */
522 .accept = sock_no_accept, /* a do nothing */
523 .getname = inet6_getname,
524 .poll = datagram_poll, /* ok */
525 .ioctl = inet6_ioctl, /* must change */
526 .listen = sock_no_listen, /* ok */
527 .shutdown = inet_shutdown, /* ok */
528 .setsockopt = sock_common_setsockopt, /* ok */
529 .getsockopt = sock_common_getsockopt, /* ok */
530 .sendmsg = inet_sendmsg, /* ok */
531 .recvmsg = sock_common_recvmsg, /* ok */
532 .mmap = sock_no_mmap,
533 .sendpage = sock_no_sendpage,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800534#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800535 .compat_setsockopt = compat_sock_common_setsockopt,
536 .compat_getsockopt = compat_sock_common_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800537#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538};
539
540static struct inet_protosw rawv6_protosw = {
541 .type = SOCK_RAW,
542 .protocol = IPPROTO_IP, /* wild card */
543 .prot = &rawv6_prot,
544 .ops = &inet6_sockraw_ops,
545 .capability = CAP_NET_RAW,
546 .no_check = UDP_CSUM_DEFAULT,
547 .flags = INET_PROTOSW_REUSE,
548};
549
550void
551inet6_register_protosw(struct inet_protosw *p)
552{
553 struct list_head *lh;
554 struct inet_protosw *answer;
555 int protocol = p->protocol;
556 struct list_head *last_perm;
557
558 spin_lock_bh(&inetsw6_lock);
559
560 if (p->type >= SOCK_MAX)
561 goto out_illegal;
562
563 /* If we are trying to override a permanent protocol, bail. */
564 answer = NULL;
565 last_perm = &inetsw6[p->type];
566 list_for_each(lh, &inetsw6[p->type]) {
567 answer = list_entry(lh, struct inet_protosw, list);
568
569 /* Check only the non-wild match. */
570 if (INET_PROTOSW_PERMANENT & answer->flags) {
571 if (protocol == answer->protocol)
572 break;
573 last_perm = lh;
574 }
575
576 answer = NULL;
577 }
578 if (answer)
579 goto out_permanent;
580
581 /* Add the new entry after the last permanent entry if any, so that
582 * the new entry does not override a permanent entry when matched with
583 * a wild-card protocol. But it is allowed to override any existing
584 * non-permanent entry. This means that when we remove this entry, the
585 * system automatically returns to the old behavior.
586 */
587 list_add_rcu(&p->list, last_perm);
588out:
589 spin_unlock_bh(&inetsw6_lock);
590 return;
591
592out_permanent:
593 printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
594 protocol);
595 goto out;
596
597out_illegal:
598 printk(KERN_ERR
599 "Ignoring attempt to register invalid socket type %d.\n",
600 p->type);
601 goto out;
602}
603
604void
605inet6_unregister_protosw(struct inet_protosw *p)
606{
607 if (INET_PROTOSW_PERMANENT & p->flags) {
608 printk(KERN_ERR
609 "Attempt to unregister permanent protocol %d.\n",
610 p->protocol);
611 } else {
612 spin_lock_bh(&inetsw6_lock);
613 list_del_rcu(&p->list);
614 spin_unlock_bh(&inetsw6_lock);
615
616 synchronize_net();
617 }
618}
619
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800620int inet6_sk_rebuild_header(struct sock *sk)
621{
622 int err;
623 struct dst_entry *dst;
624 struct ipv6_pinfo *np = inet6_sk(sk);
625
626 dst = __sk_dst_check(sk, np->dst_cookie);
627
628 if (dst == NULL) {
629 struct inet_sock *inet = inet_sk(sk);
630 struct in6_addr *final_p = NULL, final;
631 struct flowi fl;
632
633 memset(&fl, 0, sizeof(fl));
634 fl.proto = sk->sk_protocol;
635 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
636 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
637 fl.fl6_flowlabel = np->flow_label;
638 fl.oif = sk->sk_bound_dev_if;
639 fl.fl_ip_dport = inet->dport;
640 fl.fl_ip_sport = inet->sport;
641
642 if (np->opt && np->opt->srcrt) {
643 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
644 ipv6_addr_copy(&final, &fl.fl6_dst);
645 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
646 final_p = &final;
647 }
648
649 err = ip6_dst_lookup(sk, &dst, &fl);
650 if (err) {
651 sk->sk_route_caps = 0;
652 return err;
653 }
654 if (final_p)
655 ipv6_addr_copy(&fl.fl6_dst, final_p);
656
657 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
658 sk->sk_err_soft = -err;
659 return err;
660 }
661
662 ip6_dst_store(sk, dst, NULL);
663 sk->sk_route_caps = dst->dev->features &
664 ~(NETIF_F_IP_CSUM | NETIF_F_TSO);
665 }
666
667 return 0;
668}
669
670EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
671
Arnaldo Carvalho de Melo399c07d2005-12-13 23:24:28 -0800672int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
673{
674 struct ipv6_pinfo *np = inet6_sk(sk);
675 struct inet6_skb_parm *opt = IP6CB(skb);
676
677 if (np->rxopt.all) {
678 if ((opt->hop && (np->rxopt.bits.hopopts ||
679 np->rxopt.bits.ohopopts)) ||
680 ((IPV6_FLOWINFO_MASK & *(u32*)skb->nh.raw) &&
681 np->rxopt.bits.rxflow) ||
682 (opt->srcrt && (np->rxopt.bits.srcrt ||
683 np->rxopt.bits.osrcrt)) ||
684 ((opt->dst1 || opt->dst0) &&
685 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
686 return 1;
687 }
688 return 0;
689}
690
691EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
692
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693int
694snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign)
695{
696 if (ptr == NULL)
697 return -EINVAL;
698
Pekka Enbergf9f75002006-01-08 01:00:33 -0800699 ptr[0] = __alloc_percpu(mibsize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700 if (!ptr[0])
701 goto err0;
702
Pekka Enbergf9f75002006-01-08 01:00:33 -0800703 ptr[1] = __alloc_percpu(mibsize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704 if (!ptr[1])
705 goto err1;
706
707 return 0;
708
709err1:
710 free_percpu(ptr[0]);
711 ptr[0] = NULL;
712err0:
713 return -ENOMEM;
714}
715
716void
717snmp6_mib_free(void *ptr[2])
718{
719 if (ptr == NULL)
720 return;
721 if (ptr[0])
722 free_percpu(ptr[0]);
723 if (ptr[1])
724 free_percpu(ptr[1]);
725 ptr[0] = ptr[1] = NULL;
726}
727
728static int __init init_ipv6_mibs(void)
729{
730 if (snmp6_mib_init((void **)ipv6_statistics, sizeof (struct ipstats_mib),
731 __alignof__(struct ipstats_mib)) < 0)
732 goto err_ip_mib;
733 if (snmp6_mib_init((void **)icmpv6_statistics, sizeof (struct icmpv6_mib),
734 __alignof__(struct icmpv6_mib)) < 0)
735 goto err_icmp_mib;
736 if (snmp6_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib),
737 __alignof__(struct udp_mib)) < 0)
738 goto err_udp_mib;
739 return 0;
740
741err_udp_mib:
742 snmp6_mib_free((void **)icmpv6_statistics);
743err_icmp_mib:
744 snmp6_mib_free((void **)ipv6_statistics);
745err_ip_mib:
746 return -ENOMEM;
747
748}
749
750static void cleanup_ipv6_mibs(void)
751{
752 snmp6_mib_free((void **)ipv6_statistics);
753 snmp6_mib_free((void **)icmpv6_statistics);
754 snmp6_mib_free((void **)udp_stats_in6);
755}
756
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757static int __init inet6_init(void)
758{
759 struct sk_buff *dummy_skb;
760 struct list_head *r;
761 int err;
762
763#ifdef MODULE
764#if 0 /* FIXME --RR */
765 if (!mod_member_present(&__this_module, can_unload))
766 return -EINVAL;
767
768 __this_module.can_unload = &ipv6_unload;
769#endif
770#endif
771
772 if (sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb)) {
773 printk(KERN_CRIT "inet6_proto_init: size fault\n");
774 return -EINVAL;
775 }
776
777 err = proto_register(&tcpv6_prot, 1);
778 if (err)
779 goto out;
780
781 err = proto_register(&udpv6_prot, 1);
782 if (err)
783 goto out_unregister_tcp_proto;
784
785 err = proto_register(&rawv6_prot, 1);
786 if (err)
787 goto out_unregister_udp_proto;
788
789
790 /* Register the socket-side information for inet6_create. */
791 for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
792 INIT_LIST_HEAD(r);
793
794 /* We MUST register RAW sockets before we create the ICMP6,
795 * IGMP6, or NDISC control sockets.
796 */
797 inet6_register_protosw(&rawv6_protosw);
798
799 /* Register the family here so that the init calls below will
800 * be able to create sockets. (?? is this dangerous ??)
801 */
David S. Miller8eb55912005-11-11 15:05:47 -0800802 err = sock_register(&inet6_family_ops);
803 if (err)
804 goto out_unregister_raw_proto;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805
806 /* Initialise ipv6 mibs */
807 err = init_ipv6_mibs();
808 if (err)
David S. Miller8eb55912005-11-11 15:05:47 -0800809 goto out_unregister_sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810
811 /*
812 * ipngwg API draft makes clear that the correct semantics
813 * for TCP and UDP is to consider one TCP and UDP instance
814 * in a host availiable by both INET and INET6 APIs and
815 * able to communicate via both network protocols.
816 */
817
818#ifdef CONFIG_SYSCTL
819 ipv6_sysctl_register();
820#endif
821 err = icmpv6_init(&inet6_family_ops);
822 if (err)
823 goto icmp_fail;
824 err = ndisc_init(&inet6_family_ops);
825 if (err)
826 goto ndisc_fail;
827 err = igmp6_init(&inet6_family_ops);
828 if (err)
829 goto igmp_fail;
Harald Welte2cc7d572005-08-09 19:42:34 -0700830 err = ipv6_netfilter_init();
831 if (err)
832 goto netfilter_fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833 /* Create /proc/foo6 entries. */
834#ifdef CONFIG_PROC_FS
835 err = -ENOMEM;
836 if (raw6_proc_init())
837 goto proc_raw6_fail;
838 if (tcp6_proc_init())
839 goto proc_tcp6_fail;
840 if (udp6_proc_init())
841 goto proc_udp6_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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850 ip6_route_init();
851 ip6_flowlabel_init();
852 err = addrconf_init();
853 if (err)
854 goto addrconf_fail;
855 sit_init();
856
857 /* Init v6 extension headers. */
858 ipv6_rthdr_init();
859 ipv6_frag_init();
860 ipv6_nodata_init();
861 ipv6_destopt_init();
862
863 /* Init v6 transport protocols. */
864 udpv6_init();
865 tcpv6_init();
Herbert Xue2ed4052005-07-05 14:41:20 -0700866
867 ipv6_packet_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868 err = 0;
869out:
870 return err;
871
872addrconf_fail:
873 ip6_flowlabel_cleanup();
874 ip6_route_cleanup();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875#ifdef CONFIG_PROC_FS
876 if6_proc_exit();
877proc_if6_fail:
878 ac6_proc_exit();
879proc_anycast6_fail:
880 ipv6_misc_proc_exit();
881proc_misc6_fail:
882 udp6_proc_exit();
883proc_udp6_fail:
884 tcp6_proc_exit();
885proc_tcp6_fail:
886 raw6_proc_exit();
887proc_raw6_fail:
888#endif
Harald Welte2cc7d572005-08-09 19:42:34 -0700889 ipv6_netfilter_fini();
890netfilter_fail:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891 igmp6_cleanup();
892igmp_fail:
893 ndisc_cleanup();
894ndisc_fail:
895 icmpv6_cleanup();
896icmp_fail:
897#ifdef CONFIG_SYSCTL
898 ipv6_sysctl_unregister();
899#endif
900 cleanup_ipv6_mibs();
David S. Miller8eb55912005-11-11 15:05:47 -0800901out_unregister_sock:
902 sock_unregister(PF_INET6);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903out_unregister_raw_proto:
904 proto_unregister(&rawv6_prot);
905out_unregister_udp_proto:
906 proto_unregister(&udpv6_prot);
907out_unregister_tcp_proto:
908 proto_unregister(&tcpv6_prot);
909 goto out;
910}
911module_init(inet6_init);
912
913static void __exit inet6_exit(void)
914{
915 /* First of all disallow new sockets creation. */
916 sock_unregister(PF_INET6);
917#ifdef CONFIG_PROC_FS
918 if6_proc_exit();
919 ac6_proc_exit();
920 ipv6_misc_proc_exit();
921 udp6_proc_exit();
922 tcp6_proc_exit();
923 raw6_proc_exit();
924#endif
925 /* Cleanup code parts. */
926 sit_cleanup();
927 ip6_flowlabel_cleanup();
928 addrconf_cleanup();
929 ip6_route_cleanup();
930 ipv6_packet_cleanup();
931 igmp6_cleanup();
Harald Welte2cc7d572005-08-09 19:42:34 -0700932 ipv6_netfilter_fini();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933 ndisc_cleanup();
934 icmpv6_cleanup();
935#ifdef CONFIG_SYSCTL
936 ipv6_sysctl_unregister();
937#endif
938 cleanup_ipv6_mibs();
939 proto_unregister(&rawv6_prot);
940 proto_unregister(&udpv6_prot);
941 proto_unregister(&tcpv6_prot);
942}
943module_exit(inet6_exit);
944
945MODULE_ALIAS_NETPROTO(PF_INET6);