blob: 064ffab82a9fe5f7d674bc344e0798b6f97e62ec [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
372 /*
373 * Release destination entry
374 */
375
376 sk_dst_reset(sk);
377
378 /* Release rx options */
379
380 if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
381 kfree_skb(skb);
382
383 /* Free flowlabels */
384 fl6_free_socklist(sk);
385
386 /* Free tx options */
387
388 if ((opt = xchg(&np->opt, NULL)) != NULL)
389 sock_kfree_s(sk, opt, opt->tot_len);
390
391 return 0;
392}
393
Arnaldo Carvalho de Melo3cf3dc62005-12-13 23:23:20 -0800394EXPORT_SYMBOL_GPL(inet6_destroy_sock);
395
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396/*
397 * This does both peername and sockname.
398 */
399
400int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
401 int *uaddr_len, int peer)
402{
403 struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
404 struct sock *sk = sock->sk;
405 struct inet_sock *inet = inet_sk(sk);
406 struct ipv6_pinfo *np = inet6_sk(sk);
407
408 sin->sin6_family = AF_INET6;
409 sin->sin6_flowinfo = 0;
410 sin->sin6_scope_id = 0;
411 if (peer) {
412 if (!inet->dport)
413 return -ENOTCONN;
414 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
415 peer == 1)
416 return -ENOTCONN;
417 sin->sin6_port = inet->dport;
418 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
419 if (np->sndflow)
420 sin->sin6_flowinfo = np->flow_label;
421 } else {
422 if (ipv6_addr_any(&np->rcv_saddr))
423 ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
424 else
425 ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
426
427 sin->sin6_port = inet->sport;
428 }
429 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
430 sin->sin6_scope_id = sk->sk_bound_dev_if;
431 *uaddr_len = sizeof(*sin);
432 return(0);
433}
434
435int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
436{
437 struct sock *sk = sock->sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438
439 switch(cmd)
440 {
441 case SIOCGSTAMP:
442 return sock_get_timestamp(sk, (struct timeval __user *)arg);
443
444 case SIOCADDRT:
445 case SIOCDELRT:
446
447 return(ipv6_route_ioctl(cmd,(void __user *)arg));
448
449 case SIOCSIFADDR:
450 return addrconf_add_ifaddr((void __user *) arg);
451 case SIOCDIFADDR:
452 return addrconf_del_ifaddr((void __user *) arg);
453 case SIOCSIFDSTADDR:
454 return addrconf_set_dstaddr((void __user *) arg);
455 default:
Christoph Hellwigb5e5fa52006-01-03 14:18:33 -0800456 if (!sk->sk_prot->ioctl)
457 return -ENOIOCTLCMD;
458 return sk->sk_prot->ioctl(sk, cmd, arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 }
460 /*NOTREACHED*/
461 return(0);
462}
463
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800464const struct proto_ops inet6_stream_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 .family = PF_INET6,
466 .owner = THIS_MODULE,
467 .release = inet6_release,
468 .bind = inet6_bind,
469 .connect = inet_stream_connect, /* ok */
470 .socketpair = sock_no_socketpair, /* a do nothing */
471 .accept = inet_accept, /* ok */
472 .getname = inet6_getname,
473 .poll = tcp_poll, /* ok */
474 .ioctl = inet6_ioctl, /* must change */
475 .listen = inet_listen, /* ok */
476 .shutdown = inet_shutdown, /* ok */
477 .setsockopt = sock_common_setsockopt, /* ok */
478 .getsockopt = sock_common_getsockopt, /* ok */
479 .sendmsg = inet_sendmsg, /* ok */
480 .recvmsg = sock_common_recvmsg, /* ok */
481 .mmap = sock_no_mmap,
482 .sendpage = tcp_sendpage
483};
484
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800485const struct proto_ops inet6_dgram_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 .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,
504};
505
506static struct net_proto_family inet6_family_ops = {
507 .family = PF_INET6,
508 .create = inet6_create,
509 .owner = THIS_MODULE,
510};
511
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512/* Same as inet6_dgram_ops, sans udp_poll. */
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800513static const struct proto_ops inet6_sockraw_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 .family = PF_INET6,
515 .owner = THIS_MODULE,
516 .release = inet6_release,
517 .bind = inet6_bind,
518 .connect = inet_dgram_connect, /* ok */
519 .socketpair = sock_no_socketpair, /* a do nothing */
520 .accept = sock_no_accept, /* a do nothing */
521 .getname = inet6_getname,
522 .poll = datagram_poll, /* ok */
523 .ioctl = inet6_ioctl, /* must change */
524 .listen = sock_no_listen, /* ok */
525 .shutdown = inet_shutdown, /* ok */
526 .setsockopt = sock_common_setsockopt, /* ok */
527 .getsockopt = sock_common_getsockopt, /* ok */
528 .sendmsg = inet_sendmsg, /* ok */
529 .recvmsg = sock_common_recvmsg, /* ok */
530 .mmap = sock_no_mmap,
531 .sendpage = sock_no_sendpage,
532};
533
534static struct inet_protosw rawv6_protosw = {
535 .type = SOCK_RAW,
536 .protocol = IPPROTO_IP, /* wild card */
537 .prot = &rawv6_prot,
538 .ops = &inet6_sockraw_ops,
539 .capability = CAP_NET_RAW,
540 .no_check = UDP_CSUM_DEFAULT,
541 .flags = INET_PROTOSW_REUSE,
542};
543
544void
545inet6_register_protosw(struct inet_protosw *p)
546{
547 struct list_head *lh;
548 struct inet_protosw *answer;
549 int protocol = p->protocol;
550 struct list_head *last_perm;
551
552 spin_lock_bh(&inetsw6_lock);
553
554 if (p->type >= SOCK_MAX)
555 goto out_illegal;
556
557 /* If we are trying to override a permanent protocol, bail. */
558 answer = NULL;
559 last_perm = &inetsw6[p->type];
560 list_for_each(lh, &inetsw6[p->type]) {
561 answer = list_entry(lh, struct inet_protosw, list);
562
563 /* Check only the non-wild match. */
564 if (INET_PROTOSW_PERMANENT & answer->flags) {
565 if (protocol == answer->protocol)
566 break;
567 last_perm = lh;
568 }
569
570 answer = NULL;
571 }
572 if (answer)
573 goto out_permanent;
574
575 /* Add the new entry after the last permanent entry if any, so that
576 * the new entry does not override a permanent entry when matched with
577 * a wild-card protocol. But it is allowed to override any existing
578 * non-permanent entry. This means that when we remove this entry, the
579 * system automatically returns to the old behavior.
580 */
581 list_add_rcu(&p->list, last_perm);
582out:
583 spin_unlock_bh(&inetsw6_lock);
584 return;
585
586out_permanent:
587 printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
588 protocol);
589 goto out;
590
591out_illegal:
592 printk(KERN_ERR
593 "Ignoring attempt to register invalid socket type %d.\n",
594 p->type);
595 goto out;
596}
597
598void
599inet6_unregister_protosw(struct inet_protosw *p)
600{
601 if (INET_PROTOSW_PERMANENT & p->flags) {
602 printk(KERN_ERR
603 "Attempt to unregister permanent protocol %d.\n",
604 p->protocol);
605 } else {
606 spin_lock_bh(&inetsw6_lock);
607 list_del_rcu(&p->list);
608 spin_unlock_bh(&inetsw6_lock);
609
610 synchronize_net();
611 }
612}
613
Arnaldo Carvalho de Melob9750ce2005-12-13 23:22:54 -0800614int inet6_sk_rebuild_header(struct sock *sk)
615{
616 int err;
617 struct dst_entry *dst;
618 struct ipv6_pinfo *np = inet6_sk(sk);
619
620 dst = __sk_dst_check(sk, np->dst_cookie);
621
622 if (dst == NULL) {
623 struct inet_sock *inet = inet_sk(sk);
624 struct in6_addr *final_p = NULL, final;
625 struct flowi fl;
626
627 memset(&fl, 0, sizeof(fl));
628 fl.proto = sk->sk_protocol;
629 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
630 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
631 fl.fl6_flowlabel = np->flow_label;
632 fl.oif = sk->sk_bound_dev_if;
633 fl.fl_ip_dport = inet->dport;
634 fl.fl_ip_sport = inet->sport;
635
636 if (np->opt && np->opt->srcrt) {
637 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
638 ipv6_addr_copy(&final, &fl.fl6_dst);
639 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
640 final_p = &final;
641 }
642
643 err = ip6_dst_lookup(sk, &dst, &fl);
644 if (err) {
645 sk->sk_route_caps = 0;
646 return err;
647 }
648 if (final_p)
649 ipv6_addr_copy(&fl.fl6_dst, final_p);
650
651 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
652 sk->sk_err_soft = -err;
653 return err;
654 }
655
656 ip6_dst_store(sk, dst, NULL);
657 sk->sk_route_caps = dst->dev->features &
658 ~(NETIF_F_IP_CSUM | NETIF_F_TSO);
659 }
660
661 return 0;
662}
663
664EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
665
Arnaldo Carvalho de Melo399c07d2005-12-13 23:24:28 -0800666int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
667{
668 struct ipv6_pinfo *np = inet6_sk(sk);
669 struct inet6_skb_parm *opt = IP6CB(skb);
670
671 if (np->rxopt.all) {
672 if ((opt->hop && (np->rxopt.bits.hopopts ||
673 np->rxopt.bits.ohopopts)) ||
674 ((IPV6_FLOWINFO_MASK & *(u32*)skb->nh.raw) &&
675 np->rxopt.bits.rxflow) ||
676 (opt->srcrt && (np->rxopt.bits.srcrt ||
677 np->rxopt.bits.osrcrt)) ||
678 ((opt->dst1 || opt->dst0) &&
679 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
680 return 1;
681 }
682 return 0;
683}
684
685EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
686
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687int
688snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign)
689{
690 if (ptr == NULL)
691 return -EINVAL;
692
Pekka Enbergf9f75002006-01-08 01:00:33 -0800693 ptr[0] = __alloc_percpu(mibsize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694 if (!ptr[0])
695 goto err0;
696
Pekka Enbergf9f75002006-01-08 01:00:33 -0800697 ptr[1] = __alloc_percpu(mibsize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698 if (!ptr[1])
699 goto err1;
700
701 return 0;
702
703err1:
704 free_percpu(ptr[0]);
705 ptr[0] = NULL;
706err0:
707 return -ENOMEM;
708}
709
710void
711snmp6_mib_free(void *ptr[2])
712{
713 if (ptr == NULL)
714 return;
715 if (ptr[0])
716 free_percpu(ptr[0]);
717 if (ptr[1])
718 free_percpu(ptr[1]);
719 ptr[0] = ptr[1] = NULL;
720}
721
722static int __init init_ipv6_mibs(void)
723{
724 if (snmp6_mib_init((void **)ipv6_statistics, sizeof (struct ipstats_mib),
725 __alignof__(struct ipstats_mib)) < 0)
726 goto err_ip_mib;
727 if (snmp6_mib_init((void **)icmpv6_statistics, sizeof (struct icmpv6_mib),
728 __alignof__(struct icmpv6_mib)) < 0)
729 goto err_icmp_mib;
730 if (snmp6_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib),
731 __alignof__(struct udp_mib)) < 0)
732 goto err_udp_mib;
733 return 0;
734
735err_udp_mib:
736 snmp6_mib_free((void **)icmpv6_statistics);
737err_icmp_mib:
738 snmp6_mib_free((void **)ipv6_statistics);
739err_ip_mib:
740 return -ENOMEM;
741
742}
743
744static void cleanup_ipv6_mibs(void)
745{
746 snmp6_mib_free((void **)ipv6_statistics);
747 snmp6_mib_free((void **)icmpv6_statistics);
748 snmp6_mib_free((void **)udp_stats_in6);
749}
750
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751static int __init inet6_init(void)
752{
753 struct sk_buff *dummy_skb;
754 struct list_head *r;
755 int err;
756
757#ifdef MODULE
758#if 0 /* FIXME --RR */
759 if (!mod_member_present(&__this_module, can_unload))
760 return -EINVAL;
761
762 __this_module.can_unload = &ipv6_unload;
763#endif
764#endif
765
766 if (sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb)) {
767 printk(KERN_CRIT "inet6_proto_init: size fault\n");
768 return -EINVAL;
769 }
770
771 err = proto_register(&tcpv6_prot, 1);
772 if (err)
773 goto out;
774
775 err = proto_register(&udpv6_prot, 1);
776 if (err)
777 goto out_unregister_tcp_proto;
778
779 err = proto_register(&rawv6_prot, 1);
780 if (err)
781 goto out_unregister_udp_proto;
782
783
784 /* Register the socket-side information for inet6_create. */
785 for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
786 INIT_LIST_HEAD(r);
787
788 /* We MUST register RAW sockets before we create the ICMP6,
789 * IGMP6, or NDISC control sockets.
790 */
791 inet6_register_protosw(&rawv6_protosw);
792
793 /* Register the family here so that the init calls below will
794 * be able to create sockets. (?? is this dangerous ??)
795 */
David S. Miller8eb55912005-11-11 15:05:47 -0800796 err = sock_register(&inet6_family_ops);
797 if (err)
798 goto out_unregister_raw_proto;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799
800 /* Initialise ipv6 mibs */
801 err = init_ipv6_mibs();
802 if (err)
David S. Miller8eb55912005-11-11 15:05:47 -0800803 goto out_unregister_sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804
805 /*
806 * ipngwg API draft makes clear that the correct semantics
807 * for TCP and UDP is to consider one TCP and UDP instance
808 * in a host availiable by both INET and INET6 APIs and
809 * able to communicate via both network protocols.
810 */
811
812#ifdef CONFIG_SYSCTL
813 ipv6_sysctl_register();
814#endif
815 err = icmpv6_init(&inet6_family_ops);
816 if (err)
817 goto icmp_fail;
818 err = ndisc_init(&inet6_family_ops);
819 if (err)
820 goto ndisc_fail;
821 err = igmp6_init(&inet6_family_ops);
822 if (err)
823 goto igmp_fail;
Harald Welte2cc7d572005-08-09 19:42:34 -0700824 err = ipv6_netfilter_init();
825 if (err)
826 goto netfilter_fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827 /* Create /proc/foo6 entries. */
828#ifdef CONFIG_PROC_FS
829 err = -ENOMEM;
830 if (raw6_proc_init())
831 goto proc_raw6_fail;
832 if (tcp6_proc_init())
833 goto proc_tcp6_fail;
834 if (udp6_proc_init())
835 goto proc_udp6_fail;
836 if (ipv6_misc_proc_init())
837 goto proc_misc6_fail;
838
839 if (ac6_proc_init())
840 goto proc_anycast6_fail;
841 if (if6_proc_init())
842 goto proc_if6_fail;
843#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844 ip6_route_init();
845 ip6_flowlabel_init();
846 err = addrconf_init();
847 if (err)
848 goto addrconf_fail;
849 sit_init();
850
851 /* Init v6 extension headers. */
852 ipv6_rthdr_init();
853 ipv6_frag_init();
854 ipv6_nodata_init();
855 ipv6_destopt_init();
856
857 /* Init v6 transport protocols. */
858 udpv6_init();
859 tcpv6_init();
Herbert Xue2ed4052005-07-05 14:41:20 -0700860
861 ipv6_packet_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862 err = 0;
863out:
864 return err;
865
866addrconf_fail:
867 ip6_flowlabel_cleanup();
868 ip6_route_cleanup();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869#ifdef CONFIG_PROC_FS
870 if6_proc_exit();
871proc_if6_fail:
872 ac6_proc_exit();
873proc_anycast6_fail:
874 ipv6_misc_proc_exit();
875proc_misc6_fail:
876 udp6_proc_exit();
877proc_udp6_fail:
878 tcp6_proc_exit();
879proc_tcp6_fail:
880 raw6_proc_exit();
881proc_raw6_fail:
882#endif
Harald Welte2cc7d572005-08-09 19:42:34 -0700883 ipv6_netfilter_fini();
884netfilter_fail:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885 igmp6_cleanup();
886igmp_fail:
887 ndisc_cleanup();
888ndisc_fail:
889 icmpv6_cleanup();
890icmp_fail:
891#ifdef CONFIG_SYSCTL
892 ipv6_sysctl_unregister();
893#endif
894 cleanup_ipv6_mibs();
David S. Miller8eb55912005-11-11 15:05:47 -0800895out_unregister_sock:
896 sock_unregister(PF_INET6);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897out_unregister_raw_proto:
898 proto_unregister(&rawv6_prot);
899out_unregister_udp_proto:
900 proto_unregister(&udpv6_prot);
901out_unregister_tcp_proto:
902 proto_unregister(&tcpv6_prot);
903 goto out;
904}
905module_init(inet6_init);
906
907static void __exit inet6_exit(void)
908{
909 /* First of all disallow new sockets creation. */
910 sock_unregister(PF_INET6);
911#ifdef CONFIG_PROC_FS
912 if6_proc_exit();
913 ac6_proc_exit();
914 ipv6_misc_proc_exit();
915 udp6_proc_exit();
916 tcp6_proc_exit();
917 raw6_proc_exit();
918#endif
919 /* Cleanup code parts. */
920 sit_cleanup();
921 ip6_flowlabel_cleanup();
922 addrconf_cleanup();
923 ip6_route_cleanup();
924 ipv6_packet_cleanup();
925 igmp6_cleanup();
Harald Welte2cc7d572005-08-09 19:42:34 -0700926 ipv6_netfilter_fini();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927 ndisc_cleanup();
928 icmpv6_cleanup();
929#ifdef CONFIG_SYSCTL
930 ipv6_sysctl_unregister();
931#endif
932 cleanup_ipv6_mibs();
933 proto_unregister(&rawv6_prot);
934 proto_unregister(&udpv6_prot);
935 proto_unregister(&tcpv6_prot);
936}
937module_exit(inet6_exit);
938
939MODULE_ALIAS_NETPROTO(PF_INET6);