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Merge branch 'fixes' of git://git.infradead.org/users/vkoul/slave-dma
[linux-2.6.git] / net / ipv6 / af_inet6.c
blobab5c7ad482cded367c1180a3a3761615bc2a4d54
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 * Fixes:
11 * piggy, Karl Knutson : Socket protocol table
12 * Hideaki YOSHIFUJI : sin6_scope_id support
13 * Arnaldo Melo : check proc_net_create return, cleanups
14 *
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License
17 * as published by the Free Software Foundation; either version
18 * 2 of the License, or (at your option) any later version.
19 */
20
21 #define pr_fmt(fmt) "IPv6: " fmt
22
23 #include <linux/module.h>
24 #include <linux/capability.h>
25 #include <linux/errno.h>
26 #include <linux/types.h>
27 #include <linux/socket.h>
28 #include <linux/in.h>
29 #include <linux/kernel.h>
30 #include <linux/timer.h>
31 #include <linux/string.h>
32 #include <linux/sockios.h>
33 #include <linux/net.h>
34 #include <linux/fcntl.h>
35 #include <linux/mm.h>
36 #include <linux/interrupt.h>
37 #include <linux/proc_fs.h>
38 #include <linux/stat.h>
39 #include <linux/init.h>
40 #include <linux/slab.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/protocol.h>
53 #include <net/inet_common.h>
54 #include <net/route.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 <linux/mroute6.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 struct ipv6_params ipv6_defaults = {
76 .disable_ipv6 = 0,
77 .autoconf = 1,
78 };
79
80 static int disable_ipv6_mod;
81
82 module_param_named(disable, disable_ipv6_mod, int, 0444);
83 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
84
85 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
86 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
87
88 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
89 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
90
91 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
92 {
93 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
94
95 return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
96 }
97
98 static int inet6_create(struct net *net, struct socket *sock, int protocol,
99 int kern)
100 {
101 struct inet_sock *inet;
102 struct ipv6_pinfo *np;
103 struct sock *sk;
104 struct inet_protosw *answer;
105 struct proto *answer_prot;
106 unsigned char answer_flags;
107 char answer_no_check;
108 int try_loading_module = 0;
109 int err;
110
111 if (sock->type != SOCK_RAW &&
112 sock->type != SOCK_DGRAM &&
113 !inet_ehash_secret)
114 build_ehash_secret();
115
116 /* Look for the requested type/protocol pair. */
117 lookup_protocol:
118 err = -ESOCKTNOSUPPORT;
119 rcu_read_lock();
120 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
121
122 err = 0;
123 /* Check the non-wild match. */
124 if (protocol == answer->protocol) {
125 if (protocol != IPPROTO_IP)
126 break;
127 } else {
128 /* Check for the two wild cases. */
129 if (IPPROTO_IP == protocol) {
130 protocol = answer->protocol;
131 break;
132 }
133 if (IPPROTO_IP == answer->protocol)
134 break;
135 }
136 err = -EPROTONOSUPPORT;
137 }
138
139 if (err) {
140 if (try_loading_module < 2) {
141 rcu_read_unlock();
142 /*
143 * Be more specific, e.g. net-pf-10-proto-132-type-1
144 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
145 */
146 if (++try_loading_module == 1)
147 request_module("net-pf-%d-proto-%d-type-%d",
148 PF_INET6, protocol, sock->type);
149 /*
150 * Fall back to generic, e.g. net-pf-10-proto-132
151 * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
152 */
153 else
154 request_module("net-pf-%d-proto-%d",
155 PF_INET6, protocol);
156 goto lookup_protocol;
157 } else
158 goto out_rcu_unlock;
159 }
160
161 err = -EPERM;
162 if (sock->type == SOCK_RAW && !kern &&
163 !ns_capable(net->user_ns, CAP_NET_RAW))
164 goto out_rcu_unlock;
165
166 sock->ops = answer->ops;
167 answer_prot = answer->prot;
168 answer_no_check = answer->no_check;
169 answer_flags = answer->flags;
170 rcu_read_unlock();
171
172 WARN_ON(answer_prot->slab == NULL);
173
174 err = -ENOBUFS;
175 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot);
176 if (sk == NULL)
177 goto out;
178
179 sock_init_data(sock, sk);
180
181 err = 0;
182 sk->sk_no_check = answer_no_check;
183 if (INET_PROTOSW_REUSE & answer_flags)
184 sk->sk_reuse = SK_CAN_REUSE;
185
186 inet = inet_sk(sk);
187 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
188
189 if (SOCK_RAW == sock->type) {
190 inet->inet_num = protocol;
191 if (IPPROTO_RAW == protocol)
192 inet->hdrincl = 1;
193 }
194
195 sk->sk_destruct = inet_sock_destruct;
196 sk->sk_family = PF_INET6;
197 sk->sk_protocol = protocol;
198
199 sk->sk_backlog_rcv = answer->prot->backlog_rcv;
200
201 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
202 np->hop_limit = -1;
203 np->mcast_hops = IPV6_DEFAULT_MCASTHOPS;
204 np->mc_loop = 1;
205 np->pmtudisc = IPV6_PMTUDISC_WANT;
206 np->ipv6only = net->ipv6.sysctl.bindv6only;
207
208 /* Init the ipv4 part of the socket since we can have sockets
209 * using v6 API for ipv4.
210 */
211 inet->uc_ttl = -1;
212
213 inet->mc_loop = 1;
214 inet->mc_ttl = 1;
215 inet->mc_index = 0;
216 inet->mc_list = NULL;
217 inet->rcv_tos = 0;
218
219 if (ipv4_config.no_pmtu_disc)
220 inet->pmtudisc = IP_PMTUDISC_DONT;
221 else
222 inet->pmtudisc = IP_PMTUDISC_WANT;
223 /*
224 * Increment only the relevant sk_prot->socks debug field, this changes
225 * the previous behaviour of incrementing both the equivalent to
226 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
227 *
228 * This allows better debug granularity as we'll know exactly how many
229 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
230 * transport protocol socks. -acme
231 */
232 sk_refcnt_debug_inc(sk);
233
234 if (inet->inet_num) {
235 /* It assumes that any protocol which allows
236 * the user to assign a number at socket
237 * creation time automatically shares.
238 */
239 inet->inet_sport = htons(inet->inet_num);
240 sk->sk_prot->hash(sk);
241 }
242 if (sk->sk_prot->init) {
243 err = sk->sk_prot->init(sk);
244 if (err) {
245 sk_common_release(sk);
246 goto out;
247 }
248 }
249 out:
250 return err;
251 out_rcu_unlock:
252 rcu_read_unlock();
253 goto out;
254 }
255
256
257 /* bind for INET6 API */
258 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
259 {
260 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
261 struct sock *sk = sock->sk;
262 struct inet_sock *inet = inet_sk(sk);
263 struct ipv6_pinfo *np = inet6_sk(sk);
264 struct net *net = sock_net(sk);
265 __be32 v4addr = 0;
266 unsigned short snum;
267 int addr_type = 0;
268 int err = 0;
269
270 /* If the socket has its own bind function then use it. */
271 if (sk->sk_prot->bind)
272 return sk->sk_prot->bind(sk, uaddr, addr_len);
273
274 if (addr_len < SIN6_LEN_RFC2133)
275 return -EINVAL;
276
277 if (addr->sin6_family != AF_INET6)
278 return -EAFNOSUPPORT;
279
280 addr_type = ipv6_addr_type(&addr->sin6_addr);
281 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
282 return -EINVAL;
283
284 snum = ntohs(addr->sin6_port);
285 if (snum && snum < PROT_SOCK && !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
286 return -EACCES;
287
288 lock_sock(sk);
289
290 /* Check these errors (active socket, double bind). */
291 if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
292 err = -EINVAL;
293 goto out;
294 }
295
296 /* Check if the address belongs to the host. */
297 if (addr_type == IPV6_ADDR_MAPPED) {
298 int chk_addr_ret;
299
300 /* Binding to v4-mapped address on a v6-only socket
301 * makes no sense
302 */
303 if (np->ipv6only) {
304 err = -EINVAL;
305 goto out;
306 }
307
308 /* Reproduce AF_INET checks to make the bindings consistent */
309 v4addr = addr->sin6_addr.s6_addr32[3];
310 chk_addr_ret = inet_addr_type(net, v4addr);
311 if (!sysctl_ip_nonlocal_bind &&
312 !(inet->freebind || inet->transparent) &&
313 v4addr != htonl(INADDR_ANY) &&
314 chk_addr_ret != RTN_LOCAL &&
315 chk_addr_ret != RTN_MULTICAST &&
316 chk_addr_ret != RTN_BROADCAST) {
317 err = -EADDRNOTAVAIL;
318 goto out;
319 }
320 } else {
321 if (addr_type != IPV6_ADDR_ANY) {
322 struct net_device *dev = NULL;
323
324 rcu_read_lock();
325 if (__ipv6_addr_needs_scope_id(addr_type)) {
326 if (addr_len >= sizeof(struct sockaddr_in6) &&
327 addr->sin6_scope_id) {
328 /* Override any existing binding, if another one
329 * is supplied by user.
330 */
331 sk->sk_bound_dev_if = addr->sin6_scope_id;
332 }
333
334 /* Binding to link-local address requires an interface */
335 if (!sk->sk_bound_dev_if) {
336 err = -EINVAL;
337 goto out_unlock;
338 }
339 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
340 if (!dev) {
341 err = -ENODEV;
342 goto out_unlock;
343 }
344 }
345
346 /* ipv4 addr of the socket is invalid. Only the
347 * unspecified and mapped address have a v4 equivalent.
348 */
349 v4addr = LOOPBACK4_IPV6;
350 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
351 if (!(inet->freebind || inet->transparent) &&
352 !ipv6_chk_addr(net, &addr->sin6_addr,
353 dev, 0)) {
354 err = -EADDRNOTAVAIL;
355 goto out_unlock;
356 }
357 }
358 rcu_read_unlock();
359 }
360 }
361
362 inet->inet_rcv_saddr = v4addr;
363 inet->inet_saddr = v4addr;
364
365 np->rcv_saddr = addr->sin6_addr;
366
367 if (!(addr_type & IPV6_ADDR_MULTICAST))
368 np->saddr = addr->sin6_addr;
369
370 /* Make sure we are allowed to bind here. */
371 if (sk->sk_prot->get_port(sk, snum)) {
372 inet_reset_saddr(sk);
373 err = -EADDRINUSE;
374 goto out;
375 }
376
377 if (addr_type != IPV6_ADDR_ANY) {
378 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
379 if (addr_type != IPV6_ADDR_MAPPED)
380 np->ipv6only = 1;
381 }
382 if (snum)
383 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
384 inet->inet_sport = htons(inet->inet_num);
385 inet->inet_dport = 0;
386 inet->inet_daddr = 0;
387 out:
388 release_sock(sk);
389 return err;
390 out_unlock:
391 rcu_read_unlock();
392 goto out;
393 }
394 EXPORT_SYMBOL(inet6_bind);
395
396 int inet6_release(struct socket *sock)
397 {
398 struct sock *sk = sock->sk;
399
400 if (sk == NULL)
401 return -EINVAL;
402
403 /* Free mc lists */
404 ipv6_sock_mc_close(sk);
405
406 /* Free ac lists */
407 ipv6_sock_ac_close(sk);
408
409 return inet_release(sock);
410 }
411 EXPORT_SYMBOL(inet6_release);
412
413 void inet6_destroy_sock(struct sock *sk)
414 {
415 struct ipv6_pinfo *np = inet6_sk(sk);
416 struct sk_buff *skb;
417 struct ipv6_txoptions *opt;
418
419 /* Release rx options */
420
421 skb = xchg(&np->pktoptions, NULL);
422 if (skb != NULL)
423 kfree_skb(skb);
424
425 skb = xchg(&np->rxpmtu, NULL);
426 if (skb != NULL)
427 kfree_skb(skb);
428
429 /* Free flowlabels */
430 fl6_free_socklist(sk);
431
432 /* Free tx options */
433
434 opt = xchg(&np->opt, NULL);
435 if (opt != NULL)
436 sock_kfree_s(sk, opt, opt->tot_len);
437 }
438 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
439
440 /*
441 * This does both peername and sockname.
442 */
443
444 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
445 int *uaddr_len, int peer)
446 {
447 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
448 struct sock *sk = sock->sk;
449 struct inet_sock *inet = inet_sk(sk);
450 struct ipv6_pinfo *np = inet6_sk(sk);
451
452 sin->sin6_family = AF_INET6;
453 sin->sin6_flowinfo = 0;
454 sin->sin6_scope_id = 0;
455 if (peer) {
456 if (!inet->inet_dport)
457 return -ENOTCONN;
458 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
459 peer == 1)
460 return -ENOTCONN;
461 sin->sin6_port = inet->inet_dport;
462 sin->sin6_addr = np->daddr;
463 if (np->sndflow)
464 sin->sin6_flowinfo = np->flow_label;
465 } else {
466 if (ipv6_addr_any(&np->rcv_saddr))
467 sin->sin6_addr = np->saddr;
468 else
469 sin->sin6_addr = np->rcv_saddr;
470
471 sin->sin6_port = inet->inet_sport;
472 }
473 sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
474 sk->sk_bound_dev_if);
475 *uaddr_len = sizeof(*sin);
476 return 0;
477 }
478 EXPORT_SYMBOL(inet6_getname);
479
480 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
481 {
482 struct sock *sk = sock->sk;
483 struct net *net = sock_net(sk);
484
485 switch (cmd) {
486 case SIOCGSTAMP:
487 return sock_get_timestamp(sk, (struct timeval __user *)arg);
488
489 case SIOCGSTAMPNS:
490 return sock_get_timestampns(sk, (struct timespec __user *)arg);
491
492 case SIOCADDRT:
493 case SIOCDELRT:
494
495 return ipv6_route_ioctl(net, cmd, (void __user *)arg);
496
497 case SIOCSIFADDR:
498 return addrconf_add_ifaddr(net, (void __user *) arg);
499 case SIOCDIFADDR:
500 return addrconf_del_ifaddr(net, (void __user *) arg);
501 case SIOCSIFDSTADDR:
502 return addrconf_set_dstaddr(net, (void __user *) arg);
503 default:
504 if (!sk->sk_prot->ioctl)
505 return -ENOIOCTLCMD;
506 return sk->sk_prot->ioctl(sk, cmd, arg);
507 }
508 /*NOTREACHED*/
509 return 0;
510 }
511 EXPORT_SYMBOL(inet6_ioctl);
512
513 const struct proto_ops inet6_stream_ops = {
514 .family = PF_INET6,
515 .owner = THIS_MODULE,
516 .release = inet6_release,
517 .bind = inet6_bind,
518 .connect = inet_stream_connect, /* ok */
519 .socketpair = sock_no_socketpair, /* a do nothing */
520 .accept = inet_accept, /* ok */
521 .getname = inet6_getname,
522 .poll = tcp_poll, /* ok */
523 .ioctl = inet6_ioctl, /* must change */
524 .listen = inet_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 = inet_recvmsg, /* ok */
530 .mmap = sock_no_mmap,
531 .sendpage = inet_sendpage,
532 .splice_read = tcp_splice_read,
533 #ifdef CONFIG_COMPAT
534 .compat_setsockopt = compat_sock_common_setsockopt,
535 .compat_getsockopt = compat_sock_common_getsockopt,
536 #endif
537 };
538
539 const struct proto_ops inet6_dgram_ops = {
540 .family = PF_INET6,
541 .owner = THIS_MODULE,
542 .release = inet6_release,
543 .bind = inet6_bind,
544 .connect = inet_dgram_connect, /* ok */
545 .socketpair = sock_no_socketpair, /* a do nothing */
546 .accept = sock_no_accept, /* a do nothing */
547 .getname = inet6_getname,
548 .poll = udp_poll, /* ok */
549 .ioctl = inet6_ioctl, /* must change */
550 .listen = sock_no_listen, /* ok */
551 .shutdown = inet_shutdown, /* ok */
552 .setsockopt = sock_common_setsockopt, /* ok */
553 .getsockopt = sock_common_getsockopt, /* ok */
554 .sendmsg = inet_sendmsg, /* ok */
555 .recvmsg = inet_recvmsg, /* ok */
556 .mmap = sock_no_mmap,
557 .sendpage = sock_no_sendpage,
558 #ifdef CONFIG_COMPAT
559 .compat_setsockopt = compat_sock_common_setsockopt,
560 .compat_getsockopt = compat_sock_common_getsockopt,
561 #endif
562 };
563
564 static const struct net_proto_family inet6_family_ops = {
565 .family = PF_INET6,
566 .create = inet6_create,
567 .owner = THIS_MODULE,
568 };
569
570 int inet6_register_protosw(struct inet_protosw *p)
571 {
572 struct list_head *lh;
573 struct inet_protosw *answer;
574 struct list_head *last_perm;
575 int protocol = p->protocol;
576 int ret;
577
578 spin_lock_bh(&inetsw6_lock);
579
580 ret = -EINVAL;
581 if (p->type >= SOCK_MAX)
582 goto out_illegal;
583
584 /* If we are trying to override a permanent protocol, bail. */
585 answer = NULL;
586 ret = -EPERM;
587 last_perm = &inetsw6[p->type];
588 list_for_each(lh, &inetsw6[p->type]) {
589 answer = list_entry(lh, struct inet_protosw, list);
590
591 /* Check only the non-wild match. */
592 if (INET_PROTOSW_PERMANENT & answer->flags) {
593 if (protocol == answer->protocol)
594 break;
595 last_perm = lh;
596 }
597
598 answer = NULL;
599 }
600 if (answer)
601 goto out_permanent;
602
603 /* Add the new entry after the last permanent entry if any, so that
604 * the new entry does not override a permanent entry when matched with
605 * a wild-card protocol. But it is allowed to override any existing
606 * non-permanent entry. This means that when we remove this entry, the
607 * system automatically returns to the old behavior.
608 */
609 list_add_rcu(&p->list, last_perm);
610 ret = 0;
611 out:
612 spin_unlock_bh(&inetsw6_lock);
613 return ret;
614
615 out_permanent:
616 pr_err("Attempt to override permanent protocol %d\n", protocol);
617 goto out;
618
619 out_illegal:
620 pr_err("Ignoring attempt to register invalid socket type %d\n",
621 p->type);
622 goto out;
623 }
624 EXPORT_SYMBOL(inet6_register_protosw);
625
626 void
627 inet6_unregister_protosw(struct inet_protosw *p)
628 {
629 if (INET_PROTOSW_PERMANENT & p->flags) {
630 pr_err("Attempt to unregister permanent protocol %d\n",
631 p->protocol);
632 } else {
633 spin_lock_bh(&inetsw6_lock);
634 list_del_rcu(&p->list);
635 spin_unlock_bh(&inetsw6_lock);
636
637 synchronize_net();
638 }
639 }
640 EXPORT_SYMBOL(inet6_unregister_protosw);
641
642 int inet6_sk_rebuild_header(struct sock *sk)
643 {
644 struct ipv6_pinfo *np = inet6_sk(sk);
645 struct dst_entry *dst;
646
647 dst = __sk_dst_check(sk, np->dst_cookie);
648
649 if (dst == NULL) {
650 struct inet_sock *inet = inet_sk(sk);
651 struct in6_addr *final_p, final;
652 struct flowi6 fl6;
653
654 memset(&fl6, 0, sizeof(fl6));
655 fl6.flowi6_proto = sk->sk_protocol;
656 fl6.daddr = np->daddr;
657 fl6.saddr = np->saddr;
658 fl6.flowlabel = np->flow_label;
659 fl6.flowi6_oif = sk->sk_bound_dev_if;
660 fl6.flowi6_mark = sk->sk_mark;
661 fl6.fl6_dport = inet->inet_dport;
662 fl6.fl6_sport = inet->inet_sport;
663 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
664
665 final_p = fl6_update_dst(&fl6, np->opt, &final);
666
667 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
668 if (IS_ERR(dst)) {
669 sk->sk_route_caps = 0;
670 sk->sk_err_soft = -PTR_ERR(dst);
671 return PTR_ERR(dst);
672 }
673
674 __ip6_dst_store(sk, dst, NULL, NULL);
675 }
676
677 return 0;
678 }
679 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
680
681 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb)
682 {
683 const struct ipv6_pinfo *np = inet6_sk(sk);
684 const struct inet6_skb_parm *opt = IP6CB(skb);
685
686 if (np->rxopt.all) {
687 if ((opt->hop && (np->rxopt.bits.hopopts ||
688 np->rxopt.bits.ohopopts)) ||
689 ((IPV6_FLOWINFO_MASK &
690 *(__be32 *)skb_network_header(skb)) &&
691 np->rxopt.bits.rxflow) ||
692 (opt->srcrt && (np->rxopt.bits.srcrt ||
693 np->rxopt.bits.osrcrt)) ||
694 ((opt->dst1 || opt->dst0) &&
695 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
696 return true;
697 }
698 return false;
699 }
700 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
701
702 static struct packet_type ipv6_packet_type __read_mostly = {
703 .type = cpu_to_be16(ETH_P_IPV6),
704 .func = ipv6_rcv,
705 };
706
707 static int __init ipv6_packet_init(void)
708 {
709 dev_add_pack(&ipv6_packet_type);
710 return 0;
711 }
712
713 static void ipv6_packet_cleanup(void)
714 {
715 dev_remove_pack(&ipv6_packet_type);
716 }
717
718 static int __net_init ipv6_init_mibs(struct net *net)
719 {
720 if (snmp_mib_init((void __percpu **)net->mib.udp_stats_in6,
721 sizeof(struct udp_mib),
722 __alignof__(struct udp_mib)) < 0)
723 return -ENOMEM;
724 if (snmp_mib_init((void __percpu **)net->mib.udplite_stats_in6,
725 sizeof(struct udp_mib),
726 __alignof__(struct udp_mib)) < 0)
727 goto err_udplite_mib;
728 if (snmp_mib_init((void __percpu **)net->mib.ipv6_statistics,
729 sizeof(struct ipstats_mib),
730 __alignof__(struct ipstats_mib)) < 0)
731 goto err_ip_mib;
732 if (snmp_mib_init((void __percpu **)net->mib.icmpv6_statistics,
733 sizeof(struct icmpv6_mib),
734 __alignof__(struct icmpv6_mib)) < 0)
735 goto err_icmp_mib;
736 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
737 GFP_KERNEL);
738 if (!net->mib.icmpv6msg_statistics)
739 goto err_icmpmsg_mib;
740 return 0;
741
742 err_icmpmsg_mib:
743 snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics);
744 err_icmp_mib:
745 snmp_mib_free((void __percpu **)net->mib.ipv6_statistics);
746 err_ip_mib:
747 snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6);
748 err_udplite_mib:
749 snmp_mib_free((void __percpu **)net->mib.udp_stats_in6);
750 return -ENOMEM;
751 }
752
753 static void ipv6_cleanup_mibs(struct net *net)
754 {
755 snmp_mib_free((void __percpu **)net->mib.udp_stats_in6);
756 snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6);
757 snmp_mib_free((void __percpu **)net->mib.ipv6_statistics);
758 snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics);
759 kfree(net->mib.icmpv6msg_statistics);
760 }
761
762 static int __net_init inet6_net_init(struct net *net)
763 {
764 int err = 0;
765
766 net->ipv6.sysctl.bindv6only = 0;
767 net->ipv6.sysctl.icmpv6_time = 1*HZ;
768
769 err = ipv6_init_mibs(net);
770 if (err)
771 return err;
772 #ifdef CONFIG_PROC_FS
773 err = udp6_proc_init(net);
774 if (err)
775 goto out;
776 err = tcp6_proc_init(net);
777 if (err)
778 goto proc_tcp6_fail;
779 err = ac6_proc_init(net);
780 if (err)
781 goto proc_ac6_fail;
782 #endif
783 return err;
784
785 #ifdef CONFIG_PROC_FS
786 proc_ac6_fail:
787 tcp6_proc_exit(net);
788 proc_tcp6_fail:
789 udp6_proc_exit(net);
790 out:
791 ipv6_cleanup_mibs(net);
792 return err;
793 #endif
794 }
795
796 static void __net_exit inet6_net_exit(struct net *net)
797 {
798 #ifdef CONFIG_PROC_FS
799 udp6_proc_exit(net);
800 tcp6_proc_exit(net);
801 ac6_proc_exit(net);
802 #endif
803 ipv6_cleanup_mibs(net);
804 }
805
806 static struct pernet_operations inet6_net_ops = {
807 .init = inet6_net_init,
808 .exit = inet6_net_exit,
809 };
810
811 static int __init inet6_init(void)
812 {
813 struct list_head *r;
814 int err = 0;
815
816 BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > FIELD_SIZEOF(struct sk_buff, cb));
817
818 /* Register the socket-side information for inet6_create. */
819 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
820 INIT_LIST_HEAD(r);
821
822 if (disable_ipv6_mod) {
823 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
824 goto out;
825 }
826
827 err = proto_register(&tcpv6_prot, 1);
828 if (err)
829 goto out;
830
831 err = proto_register(&udpv6_prot, 1);
832 if (err)
833 goto out_unregister_tcp_proto;
834
835 err = proto_register(&udplitev6_prot, 1);
836 if (err)
837 goto out_unregister_udp_proto;
838
839 err = proto_register(&rawv6_prot, 1);
840 if (err)
841 goto out_unregister_udplite_proto;
842
843
844 /* We MUST register RAW sockets before we create the ICMP6,
845 * IGMP6, or NDISC control sockets.
846 */
847 err = rawv6_init();
848 if (err)
849 goto out_unregister_raw_proto;
850
851 /* Register the family here so that the init calls below will
852 * be able to create sockets. (?? is this dangerous ??)
853 */
854 err = sock_register(&inet6_family_ops);
855 if (err)
856 goto out_sock_register_fail;
857
858 tcpv6_prot.sysctl_mem = init_net.ipv4.sysctl_tcp_mem;
859
860 /*
861 * ipngwg API draft makes clear that the correct semantics
862 * for TCP and UDP is to consider one TCP and UDP instance
863 * in a host available by both INET and INET6 APIs and
864 * able to communicate via both network protocols.
865 */
866
867 err = register_pernet_subsys(&inet6_net_ops);
868 if (err)
869 goto register_pernet_fail;
870 err = icmpv6_init();
871 if (err)
872 goto icmp_fail;
873 err = ip6_mr_init();
874 if (err)
875 goto ipmr_fail;
876 err = ndisc_init();
877 if (err)
878 goto ndisc_fail;
879 err = igmp6_init();
880 if (err)
881 goto igmp_fail;
882 err = ipv6_netfilter_init();
883 if (err)
884 goto netfilter_fail;
885 /* Create /proc/foo6 entries. */
886 #ifdef CONFIG_PROC_FS
887 err = -ENOMEM;
888 if (raw6_proc_init())
889 goto proc_raw6_fail;
890 if (udplite6_proc_init())
891 goto proc_udplite6_fail;
892 if (ipv6_misc_proc_init())
893 goto proc_misc6_fail;
894 if (if6_proc_init())
895 goto proc_if6_fail;
896 #endif
897 err = ip6_route_init();
898 if (err)
899 goto ip6_route_fail;
900 err = ip6_flowlabel_init();
901 if (err)
902 goto ip6_flowlabel_fail;
903 err = addrconf_init();
904 if (err)
905 goto addrconf_fail;
906
907 /* Init v6 extension headers. */
908 err = ipv6_exthdrs_init();
909 if (err)
910 goto ipv6_exthdrs_fail;
911
912 err = ipv6_frag_init();
913 if (err)
914 goto ipv6_frag_fail;
915
916 /* Init v6 transport protocols. */
917 err = udpv6_init();
918 if (err)
919 goto udpv6_fail;
920
921 err = udplitev6_init();
922 if (err)
923 goto udplitev6_fail;
924
925 err = tcpv6_init();
926 if (err)
927 goto tcpv6_fail;
928
929 err = ipv6_packet_init();
930 if (err)
931 goto ipv6_packet_fail;
932
933 #ifdef CONFIG_SYSCTL
934 err = ipv6_sysctl_register();
935 if (err)
936 goto sysctl_fail;
937 #endif
938 out:
939 return err;
940
941 #ifdef CONFIG_SYSCTL
942 sysctl_fail:
943 ipv6_packet_cleanup();
944 #endif
945 ipv6_packet_fail:
946 tcpv6_exit();
947 tcpv6_fail:
948 udplitev6_exit();
949 udplitev6_fail:
950 udpv6_exit();
951 udpv6_fail:
952 ipv6_frag_exit();
953 ipv6_frag_fail:
954 ipv6_exthdrs_exit();
955 ipv6_exthdrs_fail:
956 addrconf_cleanup();
957 addrconf_fail:
958 ip6_flowlabel_cleanup();
959 ip6_flowlabel_fail:
960 ip6_route_cleanup();
961 ip6_route_fail:
962 #ifdef CONFIG_PROC_FS
963 if6_proc_exit();
964 proc_if6_fail:
965 ipv6_misc_proc_exit();
966 proc_misc6_fail:
967 udplite6_proc_exit();
968 proc_udplite6_fail:
969 raw6_proc_exit();
970 proc_raw6_fail:
971 #endif
972 ipv6_netfilter_fini();
973 netfilter_fail:
974 igmp6_cleanup();
975 igmp_fail:
976 ndisc_cleanup();
977 ndisc_fail:
978 ip6_mr_cleanup();
979 ipmr_fail:
980 icmpv6_cleanup();
981 icmp_fail:
982 unregister_pernet_subsys(&inet6_net_ops);
983 register_pernet_fail:
984 sock_unregister(PF_INET6);
985 rtnl_unregister_all(PF_INET6);
986 out_sock_register_fail:
987 rawv6_exit();
988 out_unregister_raw_proto:
989 proto_unregister(&rawv6_prot);
990 out_unregister_udplite_proto:
991 proto_unregister(&udplitev6_prot);
992 out_unregister_udp_proto:
993 proto_unregister(&udpv6_prot);
994 out_unregister_tcp_proto:
995 proto_unregister(&tcpv6_prot);
996 goto out;
997 }
998 module_init(inet6_init);
999
1000 static void __exit inet6_exit(void)
1001 {
1002 if (disable_ipv6_mod)
1003 return;
1004
1005 /* First of all disallow new sockets creation. */
1006 sock_unregister(PF_INET6);
1007 /* Disallow any further netlink messages */
1008 rtnl_unregister_all(PF_INET6);
1009
1010 udpv6_exit();
1011 udplitev6_exit();
1012 tcpv6_exit();
1013
1014 /* Cleanup code parts. */
1015 ipv6_packet_cleanup();
1016 ipv6_frag_exit();
1017 ipv6_exthdrs_exit();
1018 addrconf_cleanup();
1019 ip6_flowlabel_cleanup();
1020 ip6_route_cleanup();
1021 #ifdef CONFIG_PROC_FS
1022
1023 /* Cleanup code parts. */
1024 if6_proc_exit();
1025 ipv6_misc_proc_exit();
1026 udplite6_proc_exit();
1027 raw6_proc_exit();
1028 #endif
1029 ipv6_netfilter_fini();
1030 igmp6_cleanup();
1031 ndisc_cleanup();
1032 ip6_mr_cleanup();
1033 icmpv6_cleanup();
1034 rawv6_exit();
1035
1036 unregister_pernet_subsys(&inet6_net_ops);
1037 proto_unregister(&rawv6_prot);
1038 proto_unregister(&udplitev6_prot);
1039 proto_unregister(&udpv6_prot);
1040 proto_unregister(&tcpv6_prot);
1041
1042 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1043 }
1044 module_exit(inet6_exit);
1045
1046 MODULE_ALIAS_NETPROTO(PF_INET6);
Linus' kernel tree