blob: 5cac14a5c7784761c09a5ff20fe0561aee070968 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * PF_INET6 socket protocol family
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09003 * Linux INET6 implementation
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
5 * Authors:
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09006 * Pedro Roque <roque@di.fc.ul.pt>
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 *
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/errno.h>
27#include <linux/types.h>
28#include <linux/socket.h>
29#include <linux/in.h>
30#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#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/smp_lock.h>
Harald Welte2cc7d572005-08-09 19:42:34 -070046#include <linux/netfilter_ipv6.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
48#include <net/ip.h>
49#include <net/ipv6.h>
50#include <net/udp.h>
Gerrit Renkerba4e58e2006-11-27 11:10:57 -080051#include <net/udplite.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070052#include <net/tcp.h>
53#include <net/ipip.h>
54#include <net/protocol.h>
55#include <net/inet_common.h>
56#include <net/transp_v6.h>
57#include <net/ip6_route.h>
58#include <net/addrconf.h>
59#ifdef CONFIG_IPV6_TUNNEL
60#include <net/ip6_tunnel.h>
61#endif
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -070062#ifdef CONFIG_IPV6_MIP6
63#include <net/mip6.h>
64#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070065
66#include <asm/uaccess.h>
67#include <asm/system.h>
68
69MODULE_AUTHOR("Cast of dozens");
70MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
71MODULE_LICENSE("GPL");
72
Brian Haleyab32ea52006-09-22 14:15:41 -070073int sysctl_ipv6_bindv6only __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -070074
Linus Torvalds1da177e2005-04-16 15:20:36 -070075/* The inetsw table contains everything that inet_create needs to
76 * build a new socket.
77 */
78static struct list_head inetsw6[SOCK_MAX];
79static DEFINE_SPINLOCK(inetsw6_lock);
80
Linus Torvalds1da177e2005-04-16 15:20:36 -070081static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
82{
83 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
84
85 return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
86}
87
88static int inet6_create(struct socket *sock, int protocol)
89{
90 struct inet_sock *inet;
91 struct ipv6_pinfo *np;
92 struct sock *sk;
93 struct list_head *p;
94 struct inet_protosw *answer;
95 struct proto *answer_prot;
96 unsigned char answer_flags;
97 char answer_no_check;
YOSHIFUJI Hideakiaf1afe82005-12-02 20:56:57 -080098 int try_loading_module = 0;
99 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100
101 /* Look for the requested type/protocol pair. */
102 answer = NULL;
YOSHIFUJI Hideakiaf1afe82005-12-02 20:56:57 -0800103lookup_protocol:
104 err = -ESOCKTNOSUPPORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 rcu_read_lock();
106 list_for_each_rcu(p, &inetsw6[sock->type]) {
107 answer = list_entry(p, struct inet_protosw, list);
108
109 /* Check the non-wild match. */
110 if (protocol == answer->protocol) {
111 if (protocol != IPPROTO_IP)
112 break;
113 } else {
114 /* Check for the two wild cases. */
115 if (IPPROTO_IP == protocol) {
116 protocol = answer->protocol;
117 break;
118 }
119 if (IPPROTO_IP == answer->protocol)
120 break;
121 }
YOSHIFUJI Hideakiaf1afe82005-12-02 20:56:57 -0800122 err = -EPROTONOSUPPORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 answer = NULL;
124 }
125
YOSHIFUJI Hideakiaf1afe82005-12-02 20:56:57 -0800126 if (!answer) {
127 if (try_loading_module < 2) {
128 rcu_read_unlock();
129 /*
130 * Be more specific, e.g. net-pf-10-proto-132-type-1
131 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
132 */
133 if (++try_loading_module == 1)
134 request_module("net-pf-%d-proto-%d-type-%d",
135 PF_INET6, protocol, sock->type);
136 /*
137 * Fall back to generic, e.g. net-pf-10-proto-132
138 * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
139 */
140 else
141 request_module("net-pf-%d-proto-%d",
142 PF_INET6, protocol);
143 goto lookup_protocol;
144 } else
145 goto out_rcu_unlock;
146 }
147
148 err = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 if (answer->capability > 0 && !capable(answer->capability))
150 goto out_rcu_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
152 sock->ops = answer->ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 answer_prot = answer->prot;
154 answer_no_check = answer->no_check;
155 answer_flags = answer->flags;
156 rcu_read_unlock();
157
158 BUG_TRAP(answer_prot->slab != NULL);
159
YOSHIFUJI Hideakiaf1afe82005-12-02 20:56:57 -0800160 err = -ENOBUFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 sk = sk_alloc(PF_INET6, GFP_KERNEL, answer_prot, 1);
162 if (sk == NULL)
163 goto out;
164
165 sock_init_data(sock, sk);
166
YOSHIFUJI Hideakiaf1afe82005-12-02 20:56:57 -0800167 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 sk->sk_no_check = answer_no_check;
169 if (INET_PROTOSW_REUSE & answer_flags)
170 sk->sk_reuse = 1;
171
172 inet = inet_sk(sk);
Paul Moore469de9b2007-01-09 14:37:06 -0800173 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174
175 if (SOCK_RAW == sock->type) {
176 inet->num = protocol;
177 if (IPPROTO_RAW == protocol)
178 inet->hdrincl = 1;
179 }
180
Arnaldo Carvalho de Meloe6848972005-08-09 19:45:38 -0700181 sk->sk_destruct = inet_sock_destruct;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 sk->sk_family = PF_INET6;
183 sk->sk_protocol = protocol;
184
185 sk->sk_backlog_rcv = answer->prot->backlog_rcv;
186
187 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
188 np->hop_limit = -1;
189 np->mcast_hops = -1;
190 np->mc_loop = 1;
191 np->pmtudisc = IPV6_PMTUDISC_WANT;
192 np->ipv6only = sysctl_ipv6_bindv6only;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900193
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 /* Init the ipv4 part of the socket since we can have sockets
195 * using v6 API for ipv4.
196 */
197 inet->uc_ttl = -1;
198
199 inet->mc_loop = 1;
200 inet->mc_ttl = 1;
201 inet->mc_index = 0;
202 inet->mc_list = NULL;
203
204 if (ipv4_config.no_pmtu_disc)
205 inet->pmtudisc = IP_PMTUDISC_DONT;
206 else
207 inet->pmtudisc = IP_PMTUDISC_WANT;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900208 /*
Arnaldo Carvalho de Meloe6848972005-08-09 19:45:38 -0700209 * Increment only the relevant sk_prot->socks debug field, this changes
210 * the previous behaviour of incrementing both the equivalent to
211 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
212 *
213 * This allows better debug granularity as we'll know exactly how many
214 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
215 * transport protocol socks. -acme
216 */
217 sk_refcnt_debug_inc(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 if (inet->num) {
220 /* It assumes that any protocol which allows
221 * the user to assign a number at socket
222 * creation time automatically shares.
223 */
Al Viroe69a4ad2006-11-14 20:56:00 -0800224 inet->sport = htons(inet->num);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 sk->sk_prot->hash(sk);
226 }
227 if (sk->sk_prot->init) {
YOSHIFUJI Hideakiaf1afe82005-12-02 20:56:57 -0800228 err = sk->sk_prot->init(sk);
229 if (err) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 sk_common_release(sk);
231 goto out;
232 }
233 }
234out:
YOSHIFUJI Hideakiaf1afe82005-12-02 20:56:57 -0800235 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236out_rcu_unlock:
237 rcu_read_unlock();
238 goto out;
239}
240
241
242/* bind for INET6 API */
243int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
244{
245 struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
246 struct sock *sk = sock->sk;
247 struct inet_sock *inet = inet_sk(sk);
248 struct ipv6_pinfo *np = inet6_sk(sk);
Al Virofd683222006-09-26 22:17:51 -0700249 __be32 v4addr = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 unsigned short snum;
251 int addr_type = 0;
252 int err = 0;
253
254 /* If the socket has its own bind function then use it. */
255 if (sk->sk_prot->bind)
256 return sk->sk_prot->bind(sk, uaddr, addr_len);
257
258 if (addr_len < SIN6_LEN_RFC2133)
259 return -EINVAL;
260 addr_type = ipv6_addr_type(&addr->sin6_addr);
261 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
262 return -EINVAL;
263
264 snum = ntohs(addr->sin6_port);
265 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
266 return -EACCES;
267
268 lock_sock(sk);
269
270 /* Check these errors (active socket, double bind). */
271 if (sk->sk_state != TCP_CLOSE || inet->num) {
272 err = -EINVAL;
273 goto out;
274 }
275
276 /* Check if the address belongs to the host. */
277 if (addr_type == IPV6_ADDR_MAPPED) {
278 v4addr = addr->sin6_addr.s6_addr32[3];
279 if (inet_addr_type(v4addr) != RTN_LOCAL) {
280 err = -EADDRNOTAVAIL;
281 goto out;
282 }
283 } else {
284 if (addr_type != IPV6_ADDR_ANY) {
285 struct net_device *dev = NULL;
286
287 if (addr_type & IPV6_ADDR_LINKLOCAL) {
288 if (addr_len >= sizeof(struct sockaddr_in6) &&
289 addr->sin6_scope_id) {
290 /* Override any existing binding, if another one
291 * is supplied by user.
292 */
293 sk->sk_bound_dev_if = addr->sin6_scope_id;
294 }
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900295
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 /* Binding to link-local address requires an interface */
297 if (!sk->sk_bound_dev_if) {
298 err = -EINVAL;
299 goto out;
300 }
301 dev = dev_get_by_index(sk->sk_bound_dev_if);
302 if (!dev) {
303 err = -ENODEV;
304 goto out;
305 }
306 }
307
308 /* ipv4 addr of the socket is invalid. Only the
309 * unspecified and mapped address have a v4 equivalent.
310 */
311 v4addr = LOOPBACK4_IPV6;
312 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
313 if (!ipv6_chk_addr(&addr->sin6_addr, dev, 0)) {
314 if (dev)
315 dev_put(dev);
316 err = -EADDRNOTAVAIL;
317 goto out;
318 }
319 }
320 if (dev)
321 dev_put(dev);
322 }
323 }
324
325 inet->rcv_saddr = v4addr;
326 inet->saddr = v4addr;
327
328 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900329
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 if (!(addr_type & IPV6_ADDR_MULTICAST))
331 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
332
333 /* Make sure we are allowed to bind here. */
334 if (sk->sk_prot->get_port(sk, snum)) {
335 inet_reset_saddr(sk);
336 err = -EADDRINUSE;
337 goto out;
338 }
339
340 if (addr_type != IPV6_ADDR_ANY)
341 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
342 if (snum)
343 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
Al Viroe69a4ad2006-11-14 20:56:00 -0800344 inet->sport = htons(inet->num);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 inet->dport = 0;
346 inet->daddr = 0;
347out:
348 release_sock(sk);
349 return err;
350}
351
352int inet6_release(struct socket *sock)
353{
354 struct sock *sk = sock->sk;
355
356 if (sk == NULL)
357 return -EINVAL;
358
359 /* Free mc lists */
360 ipv6_sock_mc_close(sk);
361
362 /* Free ac lists */
363 ipv6_sock_ac_close(sk);
364
365 return inet_release(sock);
366}
367
368int inet6_destroy_sock(struct sock *sk)
369{
370 struct ipv6_pinfo *np = inet6_sk(sk);
371 struct sk_buff *skb;
372 struct ipv6_txoptions *opt;
373
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 /* Release rx options */
375
376 if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
377 kfree_skb(skb);
378
379 /* Free flowlabels */
380 fl6_free_socklist(sk);
381
382 /* Free tx options */
383
384 if ((opt = xchg(&np->opt, NULL)) != NULL)
385 sock_kfree_s(sk, opt, opt->tot_len);
386
387 return 0;
388}
389
Arnaldo Carvalho de Melo3cf3dc62005-12-13 23:23:20 -0800390EXPORT_SYMBOL_GPL(inet6_destroy_sock);
391
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392/*
393 * This does both peername and sockname.
394 */
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900395
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
397 int *uaddr_len, int peer)
398{
399 struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
400 struct sock *sk = sock->sk;
401 struct inet_sock *inet = inet_sk(sk);
402 struct ipv6_pinfo *np = inet6_sk(sk);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900403
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 sin->sin6_family = AF_INET6;
405 sin->sin6_flowinfo = 0;
406 sin->sin6_scope_id = 0;
407 if (peer) {
408 if (!inet->dport)
409 return -ENOTCONN;
410 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
411 peer == 1)
412 return -ENOTCONN;
413 sin->sin6_port = inet->dport;
414 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
415 if (np->sndflow)
416 sin->sin6_flowinfo = np->flow_label;
417 } else {
418 if (ipv6_addr_any(&np->rcv_saddr))
419 ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
420 else
421 ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
422
423 sin->sin6_port = inet->sport;
424 }
425 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
426 sin->sin6_scope_id = sk->sk_bound_dev_if;
427 *uaddr_len = sizeof(*sin);
428 return(0);
429}
430
431int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
432{
433 struct sock *sk = sock->sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900435 switch(cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 {
437 case SIOCGSTAMP:
438 return sock_get_timestamp(sk, (struct timeval __user *)arg);
439
440 case SIOCADDRT:
441 case SIOCDELRT:
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900442
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 return(ipv6_route_ioctl(cmd,(void __user *)arg));
444
445 case SIOCSIFADDR:
446 return addrconf_add_ifaddr((void __user *) arg);
447 case SIOCDIFADDR:
448 return addrconf_del_ifaddr((void __user *) arg);
449 case SIOCSIFDSTADDR:
450 return addrconf_set_dstaddr((void __user *) arg);
451 default:
Christoph Hellwigb5e5fa52006-01-03 14:18:33 -0800452 if (!sk->sk_prot->ioctl)
453 return -ENOIOCTLCMD;
454 return sk->sk_prot->ioctl(sk, cmd, arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 }
456 /*NOTREACHED*/
457 return(0);
458}
459
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800460const struct proto_ops inet6_stream_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800461 .family = PF_INET6,
462 .owner = THIS_MODULE,
463 .release = inet6_release,
464 .bind = inet6_bind,
465 .connect = inet_stream_connect, /* ok */
466 .socketpair = sock_no_socketpair, /* a do nothing */
467 .accept = inet_accept, /* ok */
468 .getname = inet6_getname,
469 .poll = tcp_poll, /* ok */
470 .ioctl = inet6_ioctl, /* must change */
471 .listen = inet_listen, /* ok */
472 .shutdown = inet_shutdown, /* ok */
473 .setsockopt = sock_common_setsockopt, /* ok */
474 .getsockopt = sock_common_getsockopt, /* ok */
475 .sendmsg = inet_sendmsg, /* ok */
476 .recvmsg = sock_common_recvmsg, /* ok */
477 .mmap = sock_no_mmap,
478 .sendpage = tcp_sendpage,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800479#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800480 .compat_setsockopt = compat_sock_common_setsockopt,
481 .compat_getsockopt = compat_sock_common_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800482#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483};
484
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800485const struct proto_ops inet6_dgram_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800486 .family = PF_INET6,
487 .owner = THIS_MODULE,
488 .release = inet6_release,
489 .bind = inet6_bind,
490 .connect = inet_dgram_connect, /* ok */
491 .socketpair = sock_no_socketpair, /* a do nothing */
492 .accept = sock_no_accept, /* a do nothing */
493 .getname = inet6_getname,
494 .poll = udp_poll, /* ok */
495 .ioctl = inet6_ioctl, /* must change */
496 .listen = sock_no_listen, /* ok */
497 .shutdown = inet_shutdown, /* ok */
498 .setsockopt = sock_common_setsockopt, /* ok */
499 .getsockopt = sock_common_getsockopt, /* ok */
500 .sendmsg = inet_sendmsg, /* ok */
501 .recvmsg = sock_common_recvmsg, /* ok */
502 .mmap = sock_no_mmap,
503 .sendpage = sock_no_sendpage,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800504#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800505 .compat_setsockopt = compat_sock_common_setsockopt,
506 .compat_getsockopt = compat_sock_common_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800507#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508};
509
510static struct net_proto_family inet6_family_ops = {
511 .family = PF_INET6,
512 .create = inet6_create,
513 .owner = THIS_MODULE,
514};
515
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516/* Same as inet6_dgram_ops, sans udp_poll. */
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800517static const struct proto_ops inet6_sockraw_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800518 .family = PF_INET6,
519 .owner = THIS_MODULE,
520 .release = inet6_release,
521 .bind = inet6_bind,
522 .connect = inet_dgram_connect, /* ok */
523 .socketpair = sock_no_socketpair, /* a do nothing */
524 .accept = sock_no_accept, /* a do nothing */
525 .getname = inet6_getname,
526 .poll = datagram_poll, /* ok */
527 .ioctl = inet6_ioctl, /* must change */
528 .listen = sock_no_listen, /* ok */
529 .shutdown = inet_shutdown, /* ok */
530 .setsockopt = sock_common_setsockopt, /* ok */
531 .getsockopt = sock_common_getsockopt, /* ok */
532 .sendmsg = inet_sendmsg, /* ok */
533 .recvmsg = sock_common_recvmsg, /* ok */
534 .mmap = sock_no_mmap,
535 .sendpage = sock_no_sendpage,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800536#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800537 .compat_setsockopt = compat_sock_common_setsockopt,
538 .compat_getsockopt = compat_sock_common_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800539#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540};
541
542static struct inet_protosw rawv6_protosw = {
543 .type = SOCK_RAW,
544 .protocol = IPPROTO_IP, /* wild card */
545 .prot = &rawv6_prot,
546 .ops = &inet6_sockraw_ops,
547 .capability = CAP_NET_RAW,
548 .no_check = UDP_CSUM_DEFAULT,
549 .flags = INET_PROTOSW_REUSE,
550};
551
552void
553inet6_register_protosw(struct inet_protosw *p)
554{
555 struct list_head *lh;
556 struct inet_protosw *answer;
557 int protocol = p->protocol;
558 struct list_head *last_perm;
559
560 spin_lock_bh(&inetsw6_lock);
561
562 if (p->type >= SOCK_MAX)
563 goto out_illegal;
564
565 /* If we are trying to override a permanent protocol, bail. */
566 answer = NULL;
567 last_perm = &inetsw6[p->type];
568 list_for_each(lh, &inetsw6[p->type]) {
569 answer = list_entry(lh, struct inet_protosw, list);
570
571 /* Check only the non-wild match. */
572 if (INET_PROTOSW_PERMANENT & answer->flags) {
573 if (protocol == answer->protocol)
574 break;
575 last_perm = lh;
576 }
577
578 answer = NULL;
579 }
580 if (answer)
581 goto out_permanent;
582
583 /* Add the new entry after the last permanent entry if any, so that
584 * the new entry does not override a permanent entry when matched with
585 * a wild-card protocol. But it is allowed to override any existing
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900586 * non-permanent entry. This means that when we remove this entry, the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587 * system automatically returns to the old behavior.
588 */
589 list_add_rcu(&p->list, last_perm);
590out:
591 spin_unlock_bh(&inetsw6_lock);
592 return;
593
594out_permanent:
595 printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
596 protocol);
597 goto out;
598
599out_illegal:
600 printk(KERN_ERR
601 "Ignoring attempt to register invalid socket type %d.\n",
602 p->type);
603 goto out;
604}
605
606void
607inet6_unregister_protosw(struct inet_protosw *p)
608{
609 if (INET_PROTOSW_PERMANENT & p->flags) {
610 printk(KERN_ERR
611 "Attempt to unregister permanent protocol %d.\n",
612 p->protocol);
613 } else {
614 spin_lock_bh(&inetsw6_lock);
615 list_del_rcu(&p->list);
616 spin_unlock_bh(&inetsw6_lock);
617
618 synchronize_net();
619 }
620}
621
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800622int inet6_sk_rebuild_header(struct sock *sk)
623{
624 int err;
625 struct dst_entry *dst;
626 struct ipv6_pinfo *np = inet6_sk(sk);
627
628 dst = __sk_dst_check(sk, np->dst_cookie);
629
630 if (dst == NULL) {
631 struct inet_sock *inet = inet_sk(sk);
632 struct in6_addr *final_p = NULL, final;
633 struct flowi fl;
634
635 memset(&fl, 0, sizeof(fl));
636 fl.proto = sk->sk_protocol;
637 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
638 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
639 fl.fl6_flowlabel = np->flow_label;
640 fl.oif = sk->sk_bound_dev_if;
641 fl.fl_ip_dport = inet->dport;
642 fl.fl_ip_sport = inet->sport;
Venkat Yekkiralabeb8d132006-08-04 23:12:42 -0700643 security_sk_classify_flow(sk, &fl);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800644
645 if (np->opt && np->opt->srcrt) {
646 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
647 ipv6_addr_copy(&final, &fl.fl6_dst);
648 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
649 final_p = &final;
650 }
651
652 err = ip6_dst_lookup(sk, &dst, &fl);
653 if (err) {
654 sk->sk_route_caps = 0;
655 return err;
656 }
657 if (final_p)
658 ipv6_addr_copy(&fl.fl6_dst, final_p);
659
660 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
661 sk->sk_err_soft = -err;
662 return err;
663 }
664
YOSHIFUJI Hideaki8e1ef0a2006-08-29 17:15:09 -0700665 __ip6_dst_store(sk, dst, NULL, NULL);
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800666 }
667
668 return 0;
669}
670
671EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
672
Arnaldo Carvalho de Melo399c07d2005-12-13 23:24:28 -0800673int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
674{
675 struct ipv6_pinfo *np = inet6_sk(sk);
676 struct inet6_skb_parm *opt = IP6CB(skb);
677
678 if (np->rxopt.all) {
679 if ((opt->hop && (np->rxopt.bits.hopopts ||
680 np->rxopt.bits.ohopopts)) ||
Al Viro90bcaf72006-11-08 00:25:17 -0800681 ((IPV6_FLOWINFO_MASK & *(__be32*)skb->nh.raw) &&
Arnaldo Carvalho de Melo399c07d2005-12-13 23:24:28 -0800682 np->rxopt.bits.rxflow) ||
683 (opt->srcrt && (np->rxopt.bits.srcrt ||
684 np->rxopt.bits.osrcrt)) ||
685 ((opt->dst1 || opt->dst0) &&
686 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
687 return 1;
688 }
689 return 0;
690}
691
692EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
693
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694int
695snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign)
696{
697 if (ptr == NULL)
698 return -EINVAL;
699
Pekka Enbergf9f75002006-01-08 01:00:33 -0800700 ptr[0] = __alloc_percpu(mibsize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701 if (!ptr[0])
702 goto err0;
703
Pekka Enbergf9f75002006-01-08 01:00:33 -0800704 ptr[1] = __alloc_percpu(mibsize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705 if (!ptr[1])
706 goto err1;
707
708 return 0;
709
710err1:
711 free_percpu(ptr[0]);
712 ptr[0] = NULL;
713err0:
714 return -ENOMEM;
715}
716
717void
718snmp6_mib_free(void *ptr[2])
719{
720 if (ptr == NULL)
721 return;
Alan Sterna1205862006-12-06 20:32:37 -0800722 free_percpu(ptr[0]);
723 free_percpu(ptr[1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724 ptr[0] = ptr[1] = NULL;
725}
726
727static int __init init_ipv6_mibs(void)
728{
729 if (snmp6_mib_init((void **)ipv6_statistics, sizeof (struct ipstats_mib),
730 __alignof__(struct ipstats_mib)) < 0)
731 goto err_ip_mib;
732 if (snmp6_mib_init((void **)icmpv6_statistics, sizeof (struct icmpv6_mib),
733 __alignof__(struct icmpv6_mib)) < 0)
734 goto err_icmp_mib;
735 if (snmp6_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib),
736 __alignof__(struct udp_mib)) < 0)
737 goto err_udp_mib;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800738 if (snmp6_mib_init((void **)udplite_stats_in6, sizeof (struct udp_mib),
739 __alignof__(struct udp_mib)) < 0)
740 goto err_udplite_mib;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741 return 0;
742
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800743err_udplite_mib:
744 snmp6_mib_free((void **)udp_stats_in6);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745err_udp_mib:
746 snmp6_mib_free((void **)icmpv6_statistics);
747err_icmp_mib:
748 snmp6_mib_free((void **)ipv6_statistics);
749err_ip_mib:
750 return -ENOMEM;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900751
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752}
753
754static void cleanup_ipv6_mibs(void)
755{
756 snmp6_mib_free((void **)ipv6_statistics);
757 snmp6_mib_free((void **)icmpv6_statistics);
758 snmp6_mib_free((void **)udp_stats_in6);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800759 snmp6_mib_free((void **)udplite_stats_in6);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760}
761
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762static int __init inet6_init(void)
763{
764 struct sk_buff *dummy_skb;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900765 struct list_head *r;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766 int err;
767
YOSHIFUJI Hideakief047f52006-09-01 00:29:06 -0700768 BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
769
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770#ifdef MODULE
771#if 0 /* FIXME --RR */
772 if (!mod_member_present(&__this_module, can_unload))
773 return -EINVAL;
774
775 __this_module.can_unload = &ipv6_unload;
776#endif
777#endif
778
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779 err = proto_register(&tcpv6_prot, 1);
780 if (err)
781 goto out;
782
783 err = proto_register(&udpv6_prot, 1);
784 if (err)
785 goto out_unregister_tcp_proto;
786
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800787 err = proto_register(&udplitev6_prot, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788 if (err)
789 goto out_unregister_udp_proto;
790
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800791 err = proto_register(&rawv6_prot, 1);
792 if (err)
793 goto out_unregister_udplite_proto;
794
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795
796 /* Register the socket-side information for inet6_create. */
797 for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
798 INIT_LIST_HEAD(r);
799
800 /* We MUST register RAW sockets before we create the ICMP6,
801 * IGMP6, or NDISC control sockets.
802 */
803 inet6_register_protosw(&rawv6_protosw);
804
805 /* Register the family here so that the init calls below will
806 * be able to create sockets. (?? is this dangerous ??)
807 */
David S. Miller8eb55912005-11-11 15:05:47 -0800808 err = sock_register(&inet6_family_ops);
809 if (err)
810 goto out_unregister_raw_proto;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811
812 /* Initialise ipv6 mibs */
813 err = init_ipv6_mibs();
814 if (err)
David S. Miller8eb55912005-11-11 15:05:47 -0800815 goto out_unregister_sock;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900816
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817 /*
818 * ipngwg API draft makes clear that the correct semantics
819 * for TCP and UDP is to consider one TCP and UDP instance
820 * in a host availiable by both INET and INET6 APIs and
821 * able to communicate via both network protocols.
822 */
823
824#ifdef CONFIG_SYSCTL
825 ipv6_sysctl_register();
826#endif
827 err = icmpv6_init(&inet6_family_ops);
828 if (err)
829 goto icmp_fail;
830 err = ndisc_init(&inet6_family_ops);
831 if (err)
832 goto ndisc_fail;
833 err = igmp6_init(&inet6_family_ops);
834 if (err)
835 goto igmp_fail;
Harald Welte2cc7d572005-08-09 19:42:34 -0700836 err = ipv6_netfilter_init();
837 if (err)
838 goto netfilter_fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839 /* Create /proc/foo6 entries. */
840#ifdef CONFIG_PROC_FS
841 err = -ENOMEM;
842 if (raw6_proc_init())
843 goto proc_raw6_fail;
844 if (tcp6_proc_init())
845 goto proc_tcp6_fail;
846 if (udp6_proc_init())
847 goto proc_udp6_fail;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800848 if (udplite6_proc_init())
849 goto proc_udplite6_fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850 if (ipv6_misc_proc_init())
851 goto proc_misc6_fail;
852
853 if (ac6_proc_init())
854 goto proc_anycast6_fail;
855 if (if6_proc_init())
856 goto proc_if6_fail;
857#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858 ip6_route_init();
859 ip6_flowlabel_init();
860 err = addrconf_init();
861 if (err)
862 goto addrconf_fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863
864 /* Init v6 extension headers. */
865 ipv6_rthdr_init();
866 ipv6_frag_init();
867 ipv6_nodata_init();
868 ipv6_destopt_init();
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700869#ifdef CONFIG_IPV6_MIP6
870 mip6_init();
871#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872
873 /* Init v6 transport protocols. */
874 udpv6_init();
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800875 udplitev6_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876 tcpv6_init();
Herbert Xue2ed4052005-07-05 14:41:20 -0700877
878 ipv6_packet_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879 err = 0;
880out:
881 return err;
882
883addrconf_fail:
884 ip6_flowlabel_cleanup();
885 ip6_route_cleanup();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886#ifdef CONFIG_PROC_FS
887 if6_proc_exit();
888proc_if6_fail:
889 ac6_proc_exit();
890proc_anycast6_fail:
891 ipv6_misc_proc_exit();
892proc_misc6_fail:
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800893 udplite6_proc_exit();
894proc_udplite6_fail:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895 udp6_proc_exit();
896proc_udp6_fail:
897 tcp6_proc_exit();
898proc_tcp6_fail:
899 raw6_proc_exit();
900proc_raw6_fail:
901#endif
Harald Welte2cc7d572005-08-09 19:42:34 -0700902 ipv6_netfilter_fini();
903netfilter_fail:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904 igmp6_cleanup();
905igmp_fail:
906 ndisc_cleanup();
907ndisc_fail:
908 icmpv6_cleanup();
909icmp_fail:
910#ifdef CONFIG_SYSCTL
911 ipv6_sysctl_unregister();
912#endif
913 cleanup_ipv6_mibs();
David S. Miller8eb55912005-11-11 15:05:47 -0800914out_unregister_sock:
915 sock_unregister(PF_INET6);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916out_unregister_raw_proto:
917 proto_unregister(&rawv6_prot);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800918out_unregister_udplite_proto:
919 proto_unregister(&udplitev6_prot);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920out_unregister_udp_proto:
921 proto_unregister(&udpv6_prot);
922out_unregister_tcp_proto:
923 proto_unregister(&tcpv6_prot);
924 goto out;
925}
926module_init(inet6_init);
927
928static void __exit inet6_exit(void)
929{
930 /* First of all disallow new sockets creation. */
931 sock_unregister(PF_INET6);
Joe Jinca17c232007-02-20 01:30:15 -0800932
933 /* Cleanup code parts. */
934 ipv6_packet_cleanup();
Noriaki TAKAMIYA2c8d7ca2006-08-23 20:31:11 -0700935#ifdef CONFIG_IPV6_MIP6
936 mip6_fini();
937#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938 addrconf_cleanup();
Joe Jinca17c232007-02-20 01:30:15 -0800939 ip6_flowlabel_cleanup();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940 ip6_route_cleanup();
Joe Jinca17c232007-02-20 01:30:15 -0800941#ifdef CONFIG_PROC_FS
942
943 /* Cleanup code parts. */
944 if6_proc_exit();
945 ac6_proc_exit();
946 ipv6_misc_proc_exit();
947 udplite6_proc_exit();
948 udp6_proc_exit();
949 tcp6_proc_exit();
950 raw6_proc_exit();
951#endif
Harald Welte2cc7d572005-08-09 19:42:34 -0700952 ipv6_netfilter_fini();
Joe Jinca17c232007-02-20 01:30:15 -0800953 igmp6_cleanup();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700954 ndisc_cleanup();
955 icmpv6_cleanup();
956#ifdef CONFIG_SYSCTL
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900957 ipv6_sysctl_unregister();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958#endif
959 cleanup_ipv6_mibs();
960 proto_unregister(&rawv6_prot);
Joe Jinca17c232007-02-20 01:30:15 -0800961 proto_unregister(&udplitev6_prot);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962 proto_unregister(&udpv6_prot);
963 proto_unregister(&tcpv6_prot);
964}
965module_exit(inet6_exit);
966
967MODULE_ALIAS_NETPROTO(PF_INET6);