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Linux 3.9-rc4
[linux-2.6/cjktty.git] / net / ipv6 / af_inet6.c
blob6b793bfc0e10b4fc42a5d7887e613d00e545ee70
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/ipip.h>
53 #include <net/protocol.h>
54 #include <net/inet_common.h>
55 #include <net/route.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
62
63 #include <asm/uaccess.h>
64 #include <linux/mroute6.h>
65
66 MODULE_AUTHOR("Cast of dozens");
67 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
68 MODULE_LICENSE("GPL");
69
70 /* The inetsw6 table contains everything that inet6_create needs to
71 * build a new socket.
72 */
73 static struct list_head inetsw6[SOCK_MAX];
74 static DEFINE_SPINLOCK(inetsw6_lock);
75
76 struct ipv6_params ipv6_defaults = {
77 .disable_ipv6 = 0,
78 .autoconf = 1,
79 };
80
81 static int disable_ipv6_mod;
82
83 module_param_named(disable, disable_ipv6_mod, int, 0444);
84 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
85
86 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
87 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
88
89 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
90 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
91
92 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
93 {
94 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
95
96 return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
97 }
98
99 static int inet6_create(struct net *net, struct socket *sock, int protocol,
100 int kern)
101 {
102 struct inet_sock *inet;
103 struct ipv6_pinfo *np;
104 struct sock *sk;
105 struct inet_protosw *answer;
106 struct proto *answer_prot;
107 unsigned char answer_flags;
108 char answer_no_check;
109 int try_loading_module = 0;
110 int err;
111
112 if (sock->type != SOCK_RAW &&
113 sock->type != SOCK_DGRAM &&
114 !inet_ehash_secret)
115 build_ehash_secret();
116
117 /* Look for the requested type/protocol pair. */
118 lookup_protocol:
119 err = -ESOCKTNOSUPPORT;
120 rcu_read_lock();
121 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
122
123 err = 0;
124 /* Check the non-wild match. */
125 if (protocol == answer->protocol) {
126 if (protocol != IPPROTO_IP)
127 break;
128 } else {
129 /* Check for the two wild cases. */
130 if (IPPROTO_IP == protocol) {
131 protocol = answer->protocol;
132 break;
133 }
134 if (IPPROTO_IP == answer->protocol)
135 break;
136 }
137 err = -EPROTONOSUPPORT;
138 }
139
140 if (err) {
141 if (try_loading_module < 2) {
142 rcu_read_unlock();
143 /*
144 * Be more specific, e.g. net-pf-10-proto-132-type-1
145 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
146 */
147 if (++try_loading_module == 1)
148 request_module("net-pf-%d-proto-%d-type-%d",
149 PF_INET6, protocol, sock->type);
150 /*
151 * Fall back to generic, e.g. net-pf-10-proto-132
152 * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
153 */
154 else
155 request_module("net-pf-%d-proto-%d",
156 PF_INET6, protocol);
157 goto lookup_protocol;
158 } else
159 goto out_rcu_unlock;
160 }
161
162 err = -EPERM;
163 if (sock->type == SOCK_RAW && !kern &&
164 !ns_capable(net->user_ns, CAP_NET_RAW))
165 goto out_rcu_unlock;
166
167 sock->ops = answer->ops;
168 answer_prot = answer->prot;
169 answer_no_check = answer->no_check;
170 answer_flags = answer->flags;
171 rcu_read_unlock();
172
173 WARN_ON(answer_prot->slab == NULL);
174
175 err = -ENOBUFS;
176 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot);
177 if (sk == NULL)
178 goto out;
179
180 sock_init_data(sock, sk);
181
182 err = 0;
183 sk->sk_no_check = answer_no_check;
184 if (INET_PROTOSW_REUSE & answer_flags)
185 sk->sk_reuse = SK_CAN_REUSE;
186
187 inet = inet_sk(sk);
188 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
189
190 if (SOCK_RAW == sock->type) {
191 inet->inet_num = protocol;
192 if (IPPROTO_RAW == protocol)
193 inet->hdrincl = 1;
194 }
195
196 sk->sk_destruct = inet_sock_destruct;
197 sk->sk_family = PF_INET6;
198 sk->sk_protocol = protocol;
199
200 sk->sk_backlog_rcv = answer->prot->backlog_rcv;
201
202 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
203 np->hop_limit = -1;
204 np->mcast_hops = IPV6_DEFAULT_MCASTHOPS;
205 np->mc_loop = 1;
206 np->pmtudisc = IPV6_PMTUDISC_WANT;
207 np->ipv6only = net->ipv6.sysctl.bindv6only;
208
209 /* Init the ipv4 part of the socket since we can have sockets
210 * using v6 API for ipv4.
211 */
212 inet->uc_ttl = -1;
213
214 inet->mc_loop = 1;
215 inet->mc_ttl = 1;
216 inet->mc_index = 0;
217 inet->mc_list = NULL;
218 inet->rcv_tos = 0;
219
220 if (ipv4_config.no_pmtu_disc)
221 inet->pmtudisc = IP_PMTUDISC_DONT;
222 else
223 inet->pmtudisc = IP_PMTUDISC_WANT;
224 /*
225 * Increment only the relevant sk_prot->socks debug field, this changes
226 * the previous behaviour of incrementing both the equivalent to
227 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
228 *
229 * This allows better debug granularity as we'll know exactly how many
230 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
231 * transport protocol socks. -acme
232 */
233 sk_refcnt_debug_inc(sk);
234
235 if (inet->inet_num) {
236 /* It assumes that any protocol which allows
237 * the user to assign a number at socket
238 * creation time automatically shares.
239 */
240 inet->inet_sport = htons(inet->inet_num);
241 sk->sk_prot->hash(sk);
242 }
243 if (sk->sk_prot->init) {
244 err = sk->sk_prot->init(sk);
245 if (err) {
246 sk_common_release(sk);
247 goto out;
248 }
249 }
250 out:
251 return err;
252 out_rcu_unlock:
253 rcu_read_unlock();
254 goto out;
255 }
256
257
258 /* bind for INET6 API */
259 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
260 {
261 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
262 struct sock *sk = sock->sk;
263 struct inet_sock *inet = inet_sk(sk);
264 struct ipv6_pinfo *np = inet6_sk(sk);
265 struct net *net = sock_net(sk);
266 __be32 v4addr = 0;
267 unsigned short snum;
268 int addr_type = 0;
269 int err = 0;
270
271 /* If the socket has its own bind function then use it. */
272 if (sk->sk_prot->bind)
273 return sk->sk_prot->bind(sk, uaddr, addr_len);
274
275 if (addr_len < SIN6_LEN_RFC2133)
276 return -EINVAL;
277
278 if (addr->sin6_family != AF_INET6)
279 return -EAFNOSUPPORT;
280
281 addr_type = ipv6_addr_type(&addr->sin6_addr);
282 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
283 return -EINVAL;
284
285 snum = ntohs(addr->sin6_port);
286 if (snum && snum < PROT_SOCK && !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
287 return -EACCES;
288
289 lock_sock(sk);
290
291 /* Check these errors (active socket, double bind). */
292 if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
293 err = -EINVAL;
294 goto out;
295 }
296
297 /* Check if the address belongs to the host. */
298 if (addr_type == IPV6_ADDR_MAPPED) {
299 int chk_addr_ret;
300
301 /* Binding to v4-mapped address on a v6-only socket
302 * makes no sense
303 */
304 if (np->ipv6only) {
305 err = -EINVAL;
306 goto out;
307 }
308
309 /* Reproduce AF_INET checks to make the bindings consistent */
310 v4addr = addr->sin6_addr.s6_addr32[3];
311 chk_addr_ret = inet_addr_type(net, v4addr);
312 if (!sysctl_ip_nonlocal_bind &&
313 !(inet->freebind || inet->transparent) &&
314 v4addr != htonl(INADDR_ANY) &&
315 chk_addr_ret != RTN_LOCAL &&
316 chk_addr_ret != RTN_MULTICAST &&
317 chk_addr_ret != RTN_BROADCAST) {
318 err = -EADDRNOTAVAIL;
319 goto out;
320 }
321 } else {
322 if (addr_type != IPV6_ADDR_ANY) {
323 struct net_device *dev = NULL;
324
325 rcu_read_lock();
326 if (addr_type & IPV6_ADDR_LINKLOCAL) {
327 if (addr_len >= sizeof(struct sockaddr_in6) &&
328 addr->sin6_scope_id) {
329 /* Override any existing binding, if another one
330 * is supplied by user.
331 */
332 sk->sk_bound_dev_if = addr->sin6_scope_id;
333 }
334
335 /* Binding to link-local address requires an interface */
336 if (!sk->sk_bound_dev_if) {
337 err = -EINVAL;
338 goto out_unlock;
339 }
340 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
341 if (!dev) {
342 err = -ENODEV;
343 goto out_unlock;
344 }
345 }
346
347 /* ipv4 addr of the socket is invalid. Only the
348 * unspecified and mapped address have a v4 equivalent.
349 */
350 v4addr = LOOPBACK4_IPV6;
351 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
352 if (!(inet->freebind || inet->transparent) &&
353 !ipv6_chk_addr(net, &addr->sin6_addr,
354 dev, 0)) {
355 err = -EADDRNOTAVAIL;
356 goto out_unlock;
357 }
358 }
359 rcu_read_unlock();
360 }
361 }
362
363 inet->inet_rcv_saddr = v4addr;
364 inet->inet_saddr = v4addr;
365
366 np->rcv_saddr = addr->sin6_addr;
367
368 if (!(addr_type & IPV6_ADDR_MULTICAST))
369 np->saddr = addr->sin6_addr;
370
371 /* Make sure we are allowed to bind here. */
372 if (sk->sk_prot->get_port(sk, snum)) {
373 inet_reset_saddr(sk);
374 err = -EADDRINUSE;
375 goto out;
376 }
377
378 if (addr_type != IPV6_ADDR_ANY) {
379 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
380 if (addr_type != IPV6_ADDR_MAPPED)
381 np->ipv6only = 1;
382 }
383 if (snum)
384 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
385 inet->inet_sport = htons(inet->inet_num);
386 inet->inet_dport = 0;
387 inet->inet_daddr = 0;
388 out:
389 release_sock(sk);
390 return err;
391 out_unlock:
392 rcu_read_unlock();
393 goto out;
394 }
395 EXPORT_SYMBOL(inet6_bind);
396
397 int inet6_release(struct socket *sock)
398 {
399 struct sock *sk = sock->sk;
400
401 if (sk == NULL)
402 return -EINVAL;
403
404 /* Free mc lists */
405 ipv6_sock_mc_close(sk);
406
407 /* Free ac lists */
408 ipv6_sock_ac_close(sk);
409
410 return inet_release(sock);
411 }
412 EXPORT_SYMBOL(inet6_release);
413
414 void inet6_destroy_sock(struct sock *sk)
415 {
416 struct ipv6_pinfo *np = inet6_sk(sk);
417 struct sk_buff *skb;
418 struct ipv6_txoptions *opt;
419
420 /* Release rx options */
421
422 skb = xchg(&np->pktoptions, NULL);
423 if (skb != NULL)
424 kfree_skb(skb);
425
426 skb = xchg(&np->rxpmtu, NULL);
427 if (skb != NULL)
428 kfree_skb(skb);
429
430 /* Free flowlabels */
431 fl6_free_socklist(sk);
432
433 /* Free tx options */
434
435 opt = xchg(&np->opt, NULL);
436 if (opt != NULL)
437 sock_kfree_s(sk, opt, opt->tot_len);
438 }
439 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
440
441 /*
442 * This does both peername and sockname.
443 */
444
445 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
446 int *uaddr_len, int peer)
447 {
448 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
449 struct sock *sk = sock->sk;
450 struct inet_sock *inet = inet_sk(sk);
451 struct ipv6_pinfo *np = inet6_sk(sk);
452
453 sin->sin6_family = AF_INET6;
454 sin->sin6_flowinfo = 0;
455 sin->sin6_scope_id = 0;
456 if (peer) {
457 if (!inet->inet_dport)
458 return -ENOTCONN;
459 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
460 peer == 1)
461 return -ENOTCONN;
462 sin->sin6_port = inet->inet_dport;
463 sin->sin6_addr = np->daddr;
464 if (np->sndflow)
465 sin->sin6_flowinfo = np->flow_label;
466 } else {
467 if (ipv6_addr_any(&np->rcv_saddr))
468 sin->sin6_addr = np->saddr;
469 else
470 sin->sin6_addr = np->rcv_saddr;
471
472 sin->sin6_port = inet->inet_sport;
473 }
474 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
475 sin->sin6_scope_id = sk->sk_bound_dev_if;
476 *uaddr_len = sizeof(*sin);
477 return 0;
478 }
479 EXPORT_SYMBOL(inet6_getname);
480
481 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
482 {
483 struct sock *sk = sock->sk;
484 struct net *net = sock_net(sk);
485
486 switch (cmd) {
487 case SIOCGSTAMP:
488 return sock_get_timestamp(sk, (struct timeval __user *)arg);
489
490 case SIOCGSTAMPNS:
491 return sock_get_timestampns(sk, (struct timespec __user *)arg);
492
493 case SIOCADDRT:
494 case SIOCDELRT:
495
496 return ipv6_route_ioctl(net, cmd, (void __user *)arg);
497
498 case SIOCSIFADDR:
499 return addrconf_add_ifaddr(net, (void __user *) arg);
500 case SIOCDIFADDR:
501 return addrconf_del_ifaddr(net, (void __user *) arg);
502 case SIOCSIFDSTADDR:
503 return addrconf_set_dstaddr(net, (void __user *) arg);
504 default:
505 if (!sk->sk_prot->ioctl)
506 return -ENOIOCTLCMD;
507 return sk->sk_prot->ioctl(sk, cmd, arg);
508 }
509 /*NOTREACHED*/
510 return 0;
511 }
512 EXPORT_SYMBOL(inet6_ioctl);
513
514 const struct proto_ops inet6_stream_ops = {
515 .family = PF_INET6,
516 .owner = THIS_MODULE,
517 .release = inet6_release,
518 .bind = inet6_bind,
519 .connect = inet_stream_connect, /* ok */
520 .socketpair = sock_no_socketpair, /* a do nothing */
521 .accept = inet_accept, /* ok */
522 .getname = inet6_getname,
523 .poll = tcp_poll, /* ok */
524 .ioctl = inet6_ioctl, /* must change */
525 .listen = inet_listen, /* ok */
526 .shutdown = inet_shutdown, /* ok */
527 .setsockopt = sock_common_setsockopt, /* ok */
528 .getsockopt = sock_common_getsockopt, /* ok */
529 .sendmsg = inet_sendmsg, /* ok */
530 .recvmsg = inet_recvmsg, /* ok */
531 .mmap = sock_no_mmap,
532 .sendpage = inet_sendpage,
533 .splice_read = tcp_splice_read,
534 #ifdef CONFIG_COMPAT
535 .compat_setsockopt = compat_sock_common_setsockopt,
536 .compat_getsockopt = compat_sock_common_getsockopt,
537 #endif
538 };
539
540 const struct proto_ops inet6_dgram_ops = {
541 .family = PF_INET6,
542 .owner = THIS_MODULE,
543 .release = inet6_release,
544 .bind = inet6_bind,
545 .connect = inet_dgram_connect, /* ok */
546 .socketpair = sock_no_socketpair, /* a do nothing */
547 .accept = sock_no_accept, /* a do nothing */
548 .getname = inet6_getname,
549 .poll = udp_poll, /* ok */
550 .ioctl = inet6_ioctl, /* must change */
551 .listen = sock_no_listen, /* ok */
552 .shutdown = inet_shutdown, /* ok */
553 .setsockopt = sock_common_setsockopt, /* ok */
554 .getsockopt = sock_common_getsockopt, /* ok */
555 .sendmsg = inet_sendmsg, /* ok */
556 .recvmsg = inet_recvmsg, /* ok */
557 .mmap = sock_no_mmap,
558 .sendpage = sock_no_sendpage,
559 #ifdef CONFIG_COMPAT
560 .compat_setsockopt = compat_sock_common_setsockopt,
561 .compat_getsockopt = compat_sock_common_getsockopt,
562 #endif
563 };
564
565 static const struct net_proto_family inet6_family_ops = {
566 .family = PF_INET6,
567 .create = inet6_create,
568 .owner = THIS_MODULE,
569 };
570
571 int inet6_register_protosw(struct inet_protosw *p)
572 {
573 struct list_head *lh;
574 struct inet_protosw *answer;
575 struct list_head *last_perm;
576 int protocol = p->protocol;
577 int ret;
578
579 spin_lock_bh(&inetsw6_lock);
580
581 ret = -EINVAL;
582 if (p->type >= SOCK_MAX)
583 goto out_illegal;
584
585 /* If we are trying to override a permanent protocol, bail. */
586 answer = NULL;
587 ret = -EPERM;
588 last_perm = &inetsw6[p->type];
589 list_for_each(lh, &inetsw6[p->type]) {
590 answer = list_entry(lh, struct inet_protosw, list);
591
592 /* Check only the non-wild match. */
593 if (INET_PROTOSW_PERMANENT & answer->flags) {
594 if (protocol == answer->protocol)
595 break;
596 last_perm = lh;
597 }
598
599 answer = NULL;
600 }
601 if (answer)
602 goto out_permanent;
603
604 /* Add the new entry after the last permanent entry if any, so that
605 * the new entry does not override a permanent entry when matched with
606 * a wild-card protocol. But it is allowed to override any existing
607 * non-permanent entry. This means that when we remove this entry, the
608 * system automatically returns to the old behavior.
609 */
610 list_add_rcu(&p->list, last_perm);
611 ret = 0;
612 out:
613 spin_unlock_bh(&inetsw6_lock);
614 return ret;
615
616 out_permanent:
617 pr_err("Attempt to override permanent protocol %d\n", protocol);
618 goto out;
619
620 out_illegal:
621 pr_err("Ignoring attempt to register invalid socket type %d\n",
622 p->type);
623 goto out;
624 }
625 EXPORT_SYMBOL(inet6_register_protosw);
626
627 void
628 inet6_unregister_protosw(struct inet_protosw *p)
629 {
630 if (INET_PROTOSW_PERMANENT & p->flags) {
631 pr_err("Attempt to unregister permanent protocol %d\n",
632 p->protocol);
633 } else {
634 spin_lock_bh(&inetsw6_lock);
635 list_del_rcu(&p->list);
636 spin_unlock_bh(&inetsw6_lock);
637
638 synchronize_net();
639 }
640 }
641 EXPORT_SYMBOL(inet6_unregister_protosw);
642
643 int inet6_sk_rebuild_header(struct sock *sk)
644 {
645 struct ipv6_pinfo *np = inet6_sk(sk);
646 struct dst_entry *dst;
647
648 dst = __sk_dst_check(sk, np->dst_cookie);
649
650 if (dst == NULL) {
651 struct inet_sock *inet = inet_sk(sk);
652 struct in6_addr *final_p, final;
653 struct flowi6 fl6;
654
655 memset(&fl6, 0, sizeof(fl6));
656 fl6.flowi6_proto = sk->sk_protocol;
657 fl6.daddr = np->daddr;
658 fl6.saddr = np->saddr;
659 fl6.flowlabel = np->flow_label;
660 fl6.flowi6_oif = sk->sk_bound_dev_if;
661 fl6.flowi6_mark = sk->sk_mark;
662 fl6.fl6_dport = inet->inet_dport;
663 fl6.fl6_sport = inet->inet_sport;
664 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
665
666 final_p = fl6_update_dst(&fl6, np->opt, &final);
667
668 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
669 if (IS_ERR(dst)) {
670 sk->sk_route_caps = 0;
671 sk->sk_err_soft = -PTR_ERR(dst);
672 return PTR_ERR(dst);
673 }
674
675 __ip6_dst_store(sk, dst, NULL, NULL);
676 }
677
678 return 0;
679 }
680 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
681
682 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb)
683 {
684 const struct ipv6_pinfo *np = inet6_sk(sk);
685 const struct inet6_skb_parm *opt = IP6CB(skb);
686
687 if (np->rxopt.all) {
688 if ((opt->hop && (np->rxopt.bits.hopopts ||
689 np->rxopt.bits.ohopopts)) ||
690 ((IPV6_FLOWINFO_MASK &
691 *(__be32 *)skb_network_header(skb)) &&
692 np->rxopt.bits.rxflow) ||
693 (opt->srcrt && (np->rxopt.bits.srcrt ||
694 np->rxopt.bits.osrcrt)) ||
695 ((opt->dst1 || opt->dst0) &&
696 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
697 return true;
698 }
699 return false;
700 }
701 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
702
703 static struct packet_type ipv6_packet_type __read_mostly = {
704 .type = cpu_to_be16(ETH_P_IPV6),
705 .func = ipv6_rcv,
706 };
707
708 static int __init ipv6_packet_init(void)
709 {
710 dev_add_pack(&ipv6_packet_type);
711 return 0;
712 }
713
714 static void ipv6_packet_cleanup(void)
715 {
716 dev_remove_pack(&ipv6_packet_type);
717 }
718
719 static int __net_init ipv6_init_mibs(struct net *net)
720 {
721 if (snmp_mib_init((void __percpu **)net->mib.udp_stats_in6,
722 sizeof(struct udp_mib),
723 __alignof__(struct udp_mib)) < 0)
724 return -ENOMEM;
725 if (snmp_mib_init((void __percpu **)net->mib.udplite_stats_in6,
726 sizeof(struct udp_mib),
727 __alignof__(struct udp_mib)) < 0)
728 goto err_udplite_mib;
729 if (snmp_mib_init((void __percpu **)net->mib.ipv6_statistics,
730 sizeof(struct ipstats_mib),
731 __alignof__(struct ipstats_mib)) < 0)
732 goto err_ip_mib;
733 if (snmp_mib_init((void __percpu **)net->mib.icmpv6_statistics,
734 sizeof(struct icmpv6_mib),
735 __alignof__(struct icmpv6_mib)) < 0)
736 goto err_icmp_mib;
737 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
738 GFP_KERNEL);
739 if (!net->mib.icmpv6msg_statistics)
740 goto err_icmpmsg_mib;
741 return 0;
742
743 err_icmpmsg_mib:
744 snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics);
745 err_icmp_mib:
746 snmp_mib_free((void __percpu **)net->mib.ipv6_statistics);
747 err_ip_mib:
748 snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6);
749 err_udplite_mib:
750 snmp_mib_free((void __percpu **)net->mib.udp_stats_in6);
751 return -ENOMEM;
752 }
753
754 static void ipv6_cleanup_mibs(struct net *net)
755 {
756 snmp_mib_free((void __percpu **)net->mib.udp_stats_in6);
757 snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6);
758 snmp_mib_free((void __percpu **)net->mib.ipv6_statistics);
759 snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics);
760 kfree(net->mib.icmpv6msg_statistics);
761 }
762
763 static int __net_init inet6_net_init(struct net *net)
764 {
765 int err = 0;
766
767 net->ipv6.sysctl.bindv6only = 0;
768 net->ipv6.sysctl.icmpv6_time = 1*HZ;
769
770 err = ipv6_init_mibs(net);
771 if (err)
772 return err;
773 #ifdef CONFIG_PROC_FS
774 err = udp6_proc_init(net);
775 if (err)
776 goto out;
777 err = tcp6_proc_init(net);
778 if (err)
779 goto proc_tcp6_fail;
780 err = ac6_proc_init(net);
781 if (err)
782 goto proc_ac6_fail;
783 #endif
784 return err;
785
786 #ifdef CONFIG_PROC_FS
787 proc_ac6_fail:
788 tcp6_proc_exit(net);
789 proc_tcp6_fail:
790 udp6_proc_exit(net);
791 out:
792 ipv6_cleanup_mibs(net);
793 return err;
794 #endif
795 }
796
797 static void __net_exit inet6_net_exit(struct net *net)
798 {
799 #ifdef CONFIG_PROC_FS
800 udp6_proc_exit(net);
801 tcp6_proc_exit(net);
802 ac6_proc_exit(net);
803 #endif
804 ipv6_cleanup_mibs(net);
805 }
806
807 static struct pernet_operations inet6_net_ops = {
808 .init = inet6_net_init,
809 .exit = inet6_net_exit,
810 };
811
812 static int __init inet6_init(void)
813 {
814 struct list_head *r;
815 int err = 0;
816
817 BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > FIELD_SIZEOF(struct sk_buff, cb));
818
819 /* Register the socket-side information for inet6_create. */
820 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
821 INIT_LIST_HEAD(r);
822
823 if (disable_ipv6_mod) {
824 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
825 goto out;
826 }
827
828 err = proto_register(&tcpv6_prot, 1);
829 if (err)
830 goto out;
831
832 err = proto_register(&udpv6_prot, 1);
833 if (err)
834 goto out_unregister_tcp_proto;
835
836 err = proto_register(&udplitev6_prot, 1);
837 if (err)
838 goto out_unregister_udp_proto;
839
840 err = proto_register(&rawv6_prot, 1);
841 if (err)
842 goto out_unregister_udplite_proto;
843
844
845 /* We MUST register RAW sockets before we create the ICMP6,
846 * IGMP6, or NDISC control sockets.
847 */
848 err = rawv6_init();
849 if (err)
850 goto out_unregister_raw_proto;
851
852 /* Register the family here so that the init calls below will
853 * be able to create sockets. (?? is this dangerous ??)
854 */
855 err = sock_register(&inet6_family_ops);
856 if (err)
857 goto out_sock_register_fail;
858
859 tcpv6_prot.sysctl_mem = init_net.ipv4.sysctl_tcp_mem;
860
861 /*
862 * ipngwg API draft makes clear that the correct semantics
863 * for TCP and UDP is to consider one TCP and UDP instance
864 * in a host available by both INET and INET6 APIs and
865 * able to communicate via both network protocols.
866 */
867
868 err = register_pernet_subsys(&inet6_net_ops);
869 if (err)
870 goto register_pernet_fail;
871 err = icmpv6_init();
872 if (err)
873 goto icmp_fail;
874 err = ip6_mr_init();
875 if (err)
876 goto ipmr_fail;
877 err = ndisc_init();
878 if (err)
879 goto ndisc_fail;
880 err = igmp6_init();
881 if (err)
882 goto igmp_fail;
883 err = ipv6_netfilter_init();
884 if (err)
885 goto netfilter_fail;
886 /* Create /proc/foo6 entries. */
887 #ifdef CONFIG_PROC_FS
888 err = -ENOMEM;
889 if (raw6_proc_init())
890 goto proc_raw6_fail;
891 if (udplite6_proc_init())
892 goto proc_udplite6_fail;
893 if (ipv6_misc_proc_init())
894 goto proc_misc6_fail;
895 if (if6_proc_init())
896 goto proc_if6_fail;
897 #endif
898 err = ip6_route_init();
899 if (err)
900 goto ip6_route_fail;
901 err = ip6_flowlabel_init();
902 if (err)
903 goto ip6_flowlabel_fail;
904 err = addrconf_init();
905 if (err)
906 goto addrconf_fail;
907
908 /* Init v6 extension headers. */
909 err = ipv6_exthdrs_init();
910 if (err)
911 goto ipv6_exthdrs_fail;
912
913 err = ipv6_frag_init();
914 if (err)
915 goto ipv6_frag_fail;
916
917 /* Init v6 transport protocols. */
918 err = udpv6_init();
919 if (err)
920 goto udpv6_fail;
921
922 err = udplitev6_init();
923 if (err)
924 goto udplitev6_fail;
925
926 err = tcpv6_init();
927 if (err)
928 goto tcpv6_fail;
929
930 err = ipv6_packet_init();
931 if (err)
932 goto ipv6_packet_fail;
933
934 #ifdef CONFIG_SYSCTL
935 err = ipv6_sysctl_register();
936 if (err)
937 goto sysctl_fail;
938 #endif
939 out:
940 return err;
941
942 #ifdef CONFIG_SYSCTL
943 sysctl_fail:
944 ipv6_packet_cleanup();
945 #endif
946 ipv6_packet_fail:
947 tcpv6_exit();
948 tcpv6_fail:
949 udplitev6_exit();
950 udplitev6_fail:
951 udpv6_exit();
952 udpv6_fail:
953 ipv6_frag_exit();
954 ipv6_frag_fail:
955 ipv6_exthdrs_exit();
956 ipv6_exthdrs_fail:
957 addrconf_cleanup();
958 addrconf_fail:
959 ip6_flowlabel_cleanup();
960 ip6_flowlabel_fail:
961 ip6_route_cleanup();
962 ip6_route_fail:
963 #ifdef CONFIG_PROC_FS
964 if6_proc_exit();
965 proc_if6_fail:
966 ipv6_misc_proc_exit();
967 proc_misc6_fail:
968 udplite6_proc_exit();
969 proc_udplite6_fail:
970 raw6_proc_exit();
971 proc_raw6_fail:
972 #endif
973 ipv6_netfilter_fini();
974 netfilter_fail:
975 igmp6_cleanup();
976 igmp_fail:
977 ndisc_cleanup();
978 ndisc_fail:
979 ip6_mr_cleanup();
980 ipmr_fail:
981 icmpv6_cleanup();
982 icmp_fail:
983 unregister_pernet_subsys(&inet6_net_ops);
984 register_pernet_fail:
985 sock_unregister(PF_INET6);
986 rtnl_unregister_all(PF_INET6);
987 out_sock_register_fail:
988 rawv6_exit();
989 out_unregister_raw_proto:
990 proto_unregister(&rawv6_prot);
991 out_unregister_udplite_proto:
992 proto_unregister(&udplitev6_prot);
993 out_unregister_udp_proto:
994 proto_unregister(&udpv6_prot);
995 out_unregister_tcp_proto:
996 proto_unregister(&tcpv6_prot);
997 goto out;
998 }
999 module_init(inet6_init);
1000
1001 static void __exit inet6_exit(void)
1002 {
1003 if (disable_ipv6_mod)
1004 return;
1005
1006 /* First of all disallow new sockets creation. */
1007 sock_unregister(PF_INET6);
1008 /* Disallow any further netlink messages */
1009 rtnl_unregister_all(PF_INET6);
1010
1011 udpv6_exit();
1012 udplitev6_exit();
1013 tcpv6_exit();
1014
1015 /* Cleanup code parts. */
1016 ipv6_packet_cleanup();
1017 ipv6_frag_exit();
1018 ipv6_exthdrs_exit();
1019 addrconf_cleanup();
1020 ip6_flowlabel_cleanup();
1021 ip6_route_cleanup();
1022 #ifdef CONFIG_PROC_FS
1023
1024 /* Cleanup code parts. */
1025 if6_proc_exit();
1026 ipv6_misc_proc_exit();
1027 udplite6_proc_exit();
1028 raw6_proc_exit();
1029 #endif
1030 ipv6_netfilter_fini();
1031 igmp6_cleanup();
1032 ndisc_cleanup();
1033 ip6_mr_cleanup();
1034 icmpv6_cleanup();
1035 rawv6_exit();
1036
1037 unregister_pernet_subsys(&inet6_net_ops);
1038 proto_unregister(&rawv6_prot);
1039 proto_unregister(&udplitev6_prot);
1040 proto_unregister(&udpv6_prot);
1041 proto_unregister(&tcpv6_prot);
1042
1043 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1044 }
1045 module_exit(inet6_exit);
1046
1047 MODULE_ALIAS_NETPROTO(PF_INET6);
CJK support for tty framebuffer vt