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Staging: Merge branch 'tidspbridge-for-2.6.39' of git://dev.omapzoom.org/pub/scm...
[zen-stable.git] / net / ipv6 / af_inet6.c
blob978e80e2c4a8a08e7731150d2a43a42fe9827e68
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
22 #include <linux/module.h>
23 #include <linux/capability.h>
24 #include <linux/errno.h>
25 #include <linux/types.h>
26 #include <linux/socket.h>
27 #include <linux/in.h>
28 #include <linux/kernel.h>
29 #include <linux/timer.h>
30 #include <linux/string.h>
31 #include <linux/sockios.h>
32 #include <linux/net.h>
33 #include <linux/fcntl.h>
34 #include <linux/mm.h>
35 #include <linux/interrupt.h>
36 #include <linux/proc_fs.h>
37 #include <linux/stat.h>
38 #include <linux/init.h>
39 #include <linux/slab.h>
40
41 #include <linux/inet.h>
42 #include <linux/netdevice.h>
43 #include <linux/icmpv6.h>
44 #include <linux/netfilter_ipv6.h>
45
46 #include <net/ip.h>
47 #include <net/ipv6.h>
48 #include <net/udp.h>
49 #include <net/udplite.h>
50 #include <net/tcp.h>
51 #include <net/ipip.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 <asm/system.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 = 0;
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 && !capable(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 = 1;
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
218 if (ipv4_config.no_pmtu_disc)
219 inet->pmtudisc = IP_PMTUDISC_DONT;
220 else
221 inet->pmtudisc = IP_PMTUDISC_WANT;
222 /*
223 * Increment only the relevant sk_prot->socks debug field, this changes
224 * the previous behaviour of incrementing both the equivalent to
225 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
226 *
227 * This allows better debug granularity as we'll know exactly how many
228 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
229 * transport protocol socks. -acme
230 */
231 sk_refcnt_debug_inc(sk);
232
233 if (inet->inet_num) {
234 /* It assumes that any protocol which allows
235 * the user to assign a number at socket
236 * creation time automatically shares.
237 */
238 inet->inet_sport = htons(inet->inet_num);
239 sk->sk_prot->hash(sk);
240 }
241 if (sk->sk_prot->init) {
242 err = sk->sk_prot->init(sk);
243 if (err) {
244 sk_common_release(sk);
245 goto out;
246 }
247 }
248 out:
249 return err;
250 out_rcu_unlock:
251 rcu_read_unlock();
252 goto out;
253 }
254
255
256 /* bind for INET6 API */
257 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
258 {
259 struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
260 struct sock *sk = sock->sk;
261 struct inet_sock *inet = inet_sk(sk);
262 struct ipv6_pinfo *np = inet6_sk(sk);
263 struct net *net = sock_net(sk);
264 __be32 v4addr = 0;
265 unsigned short snum;
266 int addr_type = 0;
267 int err = 0;
268
269 /* If the socket has its own bind function then use it. */
270 if (sk->sk_prot->bind)
271 return sk->sk_prot->bind(sk, uaddr, addr_len);
272
273 if (addr_len < SIN6_LEN_RFC2133)
274 return -EINVAL;
275 addr_type = ipv6_addr_type(&addr->sin6_addr);
276 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
277 return -EINVAL;
278
279 snum = ntohs(addr->sin6_port);
280 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
281 return -EACCES;
282
283 lock_sock(sk);
284
285 /* Check these errors (active socket, double bind). */
286 if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
287 err = -EINVAL;
288 goto out;
289 }
290
291 /* Check if the address belongs to the host. */
292 if (addr_type == IPV6_ADDR_MAPPED) {
293 int chk_addr_ret;
294
295 /* Binding to v4-mapped address on a v6-only socket
296 * makes no sense
297 */
298 if (np->ipv6only) {
299 err = -EINVAL;
300 goto out;
301 }
302
303 /* Reproduce AF_INET checks to make the bindings consistent */
304 v4addr = addr->sin6_addr.s6_addr32[3];
305 chk_addr_ret = inet_addr_type(net, v4addr);
306 if (!sysctl_ip_nonlocal_bind &&
307 !(inet->freebind || inet->transparent) &&
308 v4addr != htonl(INADDR_ANY) &&
309 chk_addr_ret != RTN_LOCAL &&
310 chk_addr_ret != RTN_MULTICAST &&
311 chk_addr_ret != RTN_BROADCAST) {
312 err = -EADDRNOTAVAIL;
313 goto out;
314 }
315 } else {
316 if (addr_type != IPV6_ADDR_ANY) {
317 struct net_device *dev = NULL;
318
319 rcu_read_lock();
320 if (addr_type & IPV6_ADDR_LINKLOCAL) {
321 if (addr_len >= sizeof(struct sockaddr_in6) &&
322 addr->sin6_scope_id) {
323 /* Override any existing binding, if another one
324 * is supplied by user.
325 */
326 sk->sk_bound_dev_if = addr->sin6_scope_id;
327 }
328
329 /* Binding to link-local address requires an interface */
330 if (!sk->sk_bound_dev_if) {
331 err = -EINVAL;
332 goto out_unlock;
333 }
334 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
335 if (!dev) {
336 err = -ENODEV;
337 goto out_unlock;
338 }
339 }
340
341 /* ipv4 addr of the socket is invalid. Only the
342 * unspecified and mapped address have a v4 equivalent.
343 */
344 v4addr = LOOPBACK4_IPV6;
345 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
346 if (!inet->transparent &&
347 !ipv6_chk_addr(net, &addr->sin6_addr,
348 dev, 0)) {
349 err = -EADDRNOTAVAIL;
350 goto out_unlock;
351 }
352 }
353 rcu_read_unlock();
354 }
355 }
356
357 inet->inet_rcv_saddr = v4addr;
358 inet->inet_saddr = v4addr;
359
360 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
361
362 if (!(addr_type & IPV6_ADDR_MULTICAST))
363 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
364
365 /* Make sure we are allowed to bind here. */
366 if (sk->sk_prot->get_port(sk, snum)) {
367 inet_reset_saddr(sk);
368 err = -EADDRINUSE;
369 goto out;
370 }
371
372 if (addr_type != IPV6_ADDR_ANY) {
373 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
374 if (addr_type != IPV6_ADDR_MAPPED)
375 np->ipv6only = 1;
376 }
377 if (snum)
378 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
379 inet->inet_sport = htons(inet->inet_num);
380 inet->inet_dport = 0;
381 inet->inet_daddr = 0;
382 out:
383 release_sock(sk);
384 return err;
385 out_unlock:
386 rcu_read_unlock();
387 goto out;
388 }
389
390 EXPORT_SYMBOL(inet6_bind);
391
392 int inet6_release(struct socket *sock)
393 {
394 struct sock *sk = sock->sk;
395
396 if (sk == NULL)
397 return -EINVAL;
398
399 /* Free mc lists */
400 ipv6_sock_mc_close(sk);
401
402 /* Free ac lists */
403 ipv6_sock_ac_close(sk);
404
405 return inet_release(sock);
406 }
407
408 EXPORT_SYMBOL(inet6_release);
409
410 void inet6_destroy_sock(struct sock *sk)
411 {
412 struct ipv6_pinfo *np = inet6_sk(sk);
413 struct sk_buff *skb;
414 struct ipv6_txoptions *opt;
415
416 /* Release rx options */
417
418 if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
419 kfree_skb(skb);
420
421 if ((skb = xchg(&np->rxpmtu, NULL)) != NULL)
422 kfree_skb(skb);
423
424 /* Free flowlabels */
425 fl6_free_socklist(sk);
426
427 /* Free tx options */
428
429 if ((opt = xchg(&np->opt, NULL)) != NULL)
430 sock_kfree_s(sk, opt, opt->tot_len);
431 }
432
433 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
434
435 /*
436 * This does both peername and sockname.
437 */
438
439 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
440 int *uaddr_len, int peer)
441 {
442 struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
443 struct sock *sk = sock->sk;
444 struct inet_sock *inet = inet_sk(sk);
445 struct ipv6_pinfo *np = inet6_sk(sk);
446
447 sin->sin6_family = AF_INET6;
448 sin->sin6_flowinfo = 0;
449 sin->sin6_scope_id = 0;
450 if (peer) {
451 if (!inet->inet_dport)
452 return -ENOTCONN;
453 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
454 peer == 1)
455 return -ENOTCONN;
456 sin->sin6_port = inet->inet_dport;
457 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
458 if (np->sndflow)
459 sin->sin6_flowinfo = np->flow_label;
460 } else {
461 if (ipv6_addr_any(&np->rcv_saddr))
462 ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
463 else
464 ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
465
466 sin->sin6_port = inet->inet_sport;
467 }
468 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
469 sin->sin6_scope_id = sk->sk_bound_dev_if;
470 *uaddr_len = sizeof(*sin);
471 return 0;
472 }
473
474 EXPORT_SYMBOL(inet6_getname);
475
476 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
477 {
478 struct sock *sk = sock->sk;
479 struct net *net = sock_net(sk);
480
481 switch(cmd)
482 {
483 case SIOCGSTAMP:
484 return sock_get_timestamp(sk, (struct timeval __user *)arg);
485
486 case SIOCGSTAMPNS:
487 return sock_get_timestampns(sk, (struct timespec __user *)arg);
488
489 case SIOCADDRT:
490 case SIOCDELRT:
491
492 return ipv6_route_ioctl(net, cmd, (void __user *)arg);
493
494 case SIOCSIFADDR:
495 return addrconf_add_ifaddr(net, (void __user *) arg);
496 case SIOCDIFADDR:
497 return addrconf_del_ifaddr(net, (void __user *) arg);
498 case SIOCSIFDSTADDR:
499 return addrconf_set_dstaddr(net, (void __user *) arg);
500 default:
501 if (!sk->sk_prot->ioctl)
502 return -ENOIOCTLCMD;
503 return sk->sk_prot->ioctl(sk, cmd, arg);
504 }
505 /*NOTREACHED*/
506 return 0;
507 }
508
509 EXPORT_SYMBOL(inet6_ioctl);
510
511 const struct proto_ops inet6_stream_ops = {
512 .family = PF_INET6,
513 .owner = THIS_MODULE,
514 .release = inet6_release,
515 .bind = inet6_bind,
516 .connect = inet_stream_connect, /* ok */
517 .socketpair = sock_no_socketpair, /* a do nothing */
518 .accept = inet_accept, /* ok */
519 .getname = inet6_getname,
520 .poll = tcp_poll, /* ok */
521 .ioctl = inet6_ioctl, /* must change */
522 .listen = inet_listen, /* ok */
523 .shutdown = inet_shutdown, /* ok */
524 .setsockopt = sock_common_setsockopt, /* ok */
525 .getsockopt = sock_common_getsockopt, /* ok */
526 .sendmsg = inet_sendmsg, /* ok */
527 .recvmsg = inet_recvmsg, /* ok */
528 .mmap = sock_no_mmap,
529 .sendpage = inet_sendpage,
530 .splice_read = tcp_splice_read,
531 #ifdef CONFIG_COMPAT
532 .compat_setsockopt = compat_sock_common_setsockopt,
533 .compat_getsockopt = compat_sock_common_getsockopt,
534 #endif
535 };
536
537 const struct proto_ops inet6_dgram_ops = {
538 .family = PF_INET6,
539 .owner = THIS_MODULE,
540 .release = inet6_release,
541 .bind = inet6_bind,
542 .connect = inet_dgram_connect, /* ok */
543 .socketpair = sock_no_socketpair, /* a do nothing */
544 .accept = sock_no_accept, /* a do nothing */
545 .getname = inet6_getname,
546 .poll = udp_poll, /* ok */
547 .ioctl = inet6_ioctl, /* must change */
548 .listen = sock_no_listen, /* ok */
549 .shutdown = inet_shutdown, /* ok */
550 .setsockopt = sock_common_setsockopt, /* ok */
551 .getsockopt = sock_common_getsockopt, /* ok */
552 .sendmsg = inet_sendmsg, /* ok */
553 .recvmsg = inet_recvmsg, /* ok */
554 .mmap = sock_no_mmap,
555 .sendpage = sock_no_sendpage,
556 #ifdef CONFIG_COMPAT
557 .compat_setsockopt = compat_sock_common_setsockopt,
558 .compat_getsockopt = compat_sock_common_getsockopt,
559 #endif
560 };
561
562 static const struct net_proto_family inet6_family_ops = {
563 .family = PF_INET6,
564 .create = inet6_create,
565 .owner = THIS_MODULE,
566 };
567
568 int inet6_register_protosw(struct inet_protosw *p)
569 {
570 struct list_head *lh;
571 struct inet_protosw *answer;
572 struct list_head *last_perm;
573 int protocol = p->protocol;
574 int ret;
575
576 spin_lock_bh(&inetsw6_lock);
577
578 ret = -EINVAL;
579 if (p->type >= SOCK_MAX)
580 goto out_illegal;
581
582 /* If we are trying to override a permanent protocol, bail. */
583 answer = NULL;
584 ret = -EPERM;
585 last_perm = &inetsw6[p->type];
586 list_for_each(lh, &inetsw6[p->type]) {
587 answer = list_entry(lh, struct inet_protosw, list);
588
589 /* Check only the non-wild match. */
590 if (INET_PROTOSW_PERMANENT & answer->flags) {
591 if (protocol == answer->protocol)
592 break;
593 last_perm = lh;
594 }
595
596 answer = NULL;
597 }
598 if (answer)
599 goto out_permanent;
600
601 /* Add the new entry after the last permanent entry if any, so that
602 * the new entry does not override a permanent entry when matched with
603 * a wild-card protocol. But it is allowed to override any existing
604 * non-permanent entry. This means that when we remove this entry, the
605 * system automatically returns to the old behavior.
606 */
607 list_add_rcu(&p->list, last_perm);
608 ret = 0;
609 out:
610 spin_unlock_bh(&inetsw6_lock);
611 return ret;
612
613 out_permanent:
614 printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
615 protocol);
616 goto out;
617
618 out_illegal:
619 printk(KERN_ERR
620 "Ignoring attempt to register invalid socket type %d.\n",
621 p->type);
622 goto out;
623 }
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 printk(KERN_ERR
632 "Attempt to unregister permanent protocol %d.\n",
633 p->protocol);
634 } else {
635 spin_lock_bh(&inetsw6_lock);
636 list_del_rcu(&p->list);
637 spin_unlock_bh(&inetsw6_lock);
638
639 synchronize_net();
640 }
641 }
642
643 EXPORT_SYMBOL(inet6_unregister_protosw);
644
645 int inet6_sk_rebuild_header(struct sock *sk)
646 {
647 int err;
648 struct dst_entry *dst;
649 struct ipv6_pinfo *np = inet6_sk(sk);
650
651 dst = __sk_dst_check(sk, np->dst_cookie);
652
653 if (dst == NULL) {
654 struct inet_sock *inet = inet_sk(sk);
655 struct in6_addr *final_p, final;
656 struct flowi fl;
657
658 memset(&fl, 0, sizeof(fl));
659 fl.proto = sk->sk_protocol;
660 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
661 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
662 fl.fl6_flowlabel = np->flow_label;
663 fl.oif = sk->sk_bound_dev_if;
664 fl.mark = sk->sk_mark;
665 fl.fl_ip_dport = inet->inet_dport;
666 fl.fl_ip_sport = inet->inet_sport;
667 security_sk_classify_flow(sk, &fl);
668
669 final_p = fl6_update_dst(&fl, np->opt, &final);
670
671 err = ip6_dst_lookup(sk, &dst, &fl);
672 if (err) {
673 sk->sk_route_caps = 0;
674 return err;
675 }
676 if (final_p)
677 ipv6_addr_copy(&fl.fl6_dst, final_p);
678
679 if ((err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0) {
680 sk->sk_err_soft = -err;
681 return err;
682 }
683
684 __ip6_dst_store(sk, dst, NULL, NULL);
685 }
686
687 return 0;
688 }
689
690 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
691
692 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
693 {
694 struct ipv6_pinfo *np = inet6_sk(sk);
695 struct inet6_skb_parm *opt = IP6CB(skb);
696
697 if (np->rxopt.all) {
698 if ((opt->hop && (np->rxopt.bits.hopopts ||
699 np->rxopt.bits.ohopopts)) ||
700 ((IPV6_FLOWINFO_MASK &
701 *(__be32 *)skb_network_header(skb)) &&
702 np->rxopt.bits.rxflow) ||
703 (opt->srcrt && (np->rxopt.bits.srcrt ||
704 np->rxopt.bits.osrcrt)) ||
705 ((opt->dst1 || opt->dst0) &&
706 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
707 return 1;
708 }
709 return 0;
710 }
711
712 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
713
714 static int ipv6_gso_pull_exthdrs(struct sk_buff *skb, int proto)
715 {
716 const struct inet6_protocol *ops = NULL;
717
718 for (;;) {
719 struct ipv6_opt_hdr *opth;
720 int len;
721
722 if (proto != NEXTHDR_HOP) {
723 ops = rcu_dereference(inet6_protos[proto]);
724
725 if (unlikely(!ops))
726 break;
727
728 if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
729 break;
730 }
731
732 if (unlikely(!pskb_may_pull(skb, 8)))
733 break;
734
735 opth = (void *)skb->data;
736 len = ipv6_optlen(opth);
737
738 if (unlikely(!pskb_may_pull(skb, len)))
739 break;
740
741 proto = opth->nexthdr;
742 __skb_pull(skb, len);
743 }
744
745 return proto;
746 }
747
748 static int ipv6_gso_send_check(struct sk_buff *skb)
749 {
750 struct ipv6hdr *ipv6h;
751 const struct inet6_protocol *ops;
752 int err = -EINVAL;
753
754 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
755 goto out;
756
757 ipv6h = ipv6_hdr(skb);
758 __skb_pull(skb, sizeof(*ipv6h));
759 err = -EPROTONOSUPPORT;
760
761 rcu_read_lock();
762 ops = rcu_dereference(inet6_protos[
763 ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]);
764
765 if (likely(ops && ops->gso_send_check)) {
766 skb_reset_transport_header(skb);
767 err = ops->gso_send_check(skb);
768 }
769 rcu_read_unlock();
770
771 out:
772 return err;
773 }
774
775 static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features)
776 {
777 struct sk_buff *segs = ERR_PTR(-EINVAL);
778 struct ipv6hdr *ipv6h;
779 const struct inet6_protocol *ops;
780 int proto;
781 struct frag_hdr *fptr;
782 unsigned int unfrag_ip6hlen;
783 u8 *prevhdr;
784 int offset = 0;
785
786 if (!(features & NETIF_F_V6_CSUM))
787 features &= ~NETIF_F_SG;
788
789 if (unlikely(skb_shinfo(skb)->gso_type &
790 ~(SKB_GSO_UDP |
791 SKB_GSO_DODGY |
792 SKB_GSO_TCP_ECN |
793 SKB_GSO_TCPV6 |
794 0)))
795 goto out;
796
797 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
798 goto out;
799
800 ipv6h = ipv6_hdr(skb);
801 __skb_pull(skb, sizeof(*ipv6h));
802 segs = ERR_PTR(-EPROTONOSUPPORT);
803
804 proto = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
805 rcu_read_lock();
806 ops = rcu_dereference(inet6_protos[proto]);
807 if (likely(ops && ops->gso_segment)) {
808 skb_reset_transport_header(skb);
809 segs = ops->gso_segment(skb, features);
810 }
811 rcu_read_unlock();
812
813 if (IS_ERR(segs))
814 goto out;
815
816 for (skb = segs; skb; skb = skb->next) {
817 ipv6h = ipv6_hdr(skb);
818 ipv6h->payload_len = htons(skb->len - skb->mac_len -
819 sizeof(*ipv6h));
820 if (proto == IPPROTO_UDP) {
821 unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
822 fptr = (struct frag_hdr *)(skb_network_header(skb) +
823 unfrag_ip6hlen);
824 fptr->frag_off = htons(offset);
825 if (skb->next != NULL)
826 fptr->frag_off |= htons(IP6_MF);
827 offset += (ntohs(ipv6h->payload_len) -
828 sizeof(struct frag_hdr));
829 }
830 }
831
832 out:
833 return segs;
834 }
835
836 struct ipv6_gro_cb {
837 struct napi_gro_cb napi;
838 int proto;
839 };
840
841 #define IPV6_GRO_CB(skb) ((struct ipv6_gro_cb *)(skb)->cb)
842
843 static struct sk_buff **ipv6_gro_receive(struct sk_buff **head,
844 struct sk_buff *skb)
845 {
846 const struct inet6_protocol *ops;
847 struct sk_buff **pp = NULL;
848 struct sk_buff *p;
849 struct ipv6hdr *iph;
850 unsigned int nlen;
851 unsigned int hlen;
852 unsigned int off;
853 int flush = 1;
854 int proto;
855 __wsum csum;
856
857 off = skb_gro_offset(skb);
858 hlen = off + sizeof(*iph);
859 iph = skb_gro_header_fast(skb, off);
860 if (skb_gro_header_hard(skb, hlen)) {
861 iph = skb_gro_header_slow(skb, hlen, off);
862 if (unlikely(!iph))
863 goto out;
864 }
865
866 skb_gro_pull(skb, sizeof(*iph));
867 skb_set_transport_header(skb, skb_gro_offset(skb));
868
869 flush += ntohs(iph->payload_len) != skb_gro_len(skb);
870
871 rcu_read_lock();
872 proto = iph->nexthdr;
873 ops = rcu_dereference(inet6_protos[proto]);
874 if (!ops || !ops->gro_receive) {
875 __pskb_pull(skb, skb_gro_offset(skb));
876 proto = ipv6_gso_pull_exthdrs(skb, proto);
877 skb_gro_pull(skb, -skb_transport_offset(skb));
878 skb_reset_transport_header(skb);
879 __skb_push(skb, skb_gro_offset(skb));
880
881 if (!ops || !ops->gro_receive)
882 goto out_unlock;
883
884 iph = ipv6_hdr(skb);
885 }
886
887 IPV6_GRO_CB(skb)->proto = proto;
888
889 flush--;
890 nlen = skb_network_header_len(skb);
891
892 for (p = *head; p; p = p->next) {
893 struct ipv6hdr *iph2;
894
895 if (!NAPI_GRO_CB(p)->same_flow)
896 continue;
897
898 iph2 = ipv6_hdr(p);
899
900 /* All fields must match except length. */
901 if (nlen != skb_network_header_len(p) ||
902 memcmp(iph, iph2, offsetof(struct ipv6hdr, payload_len)) ||
903 memcmp(&iph->nexthdr, &iph2->nexthdr,
904 nlen - offsetof(struct ipv6hdr, nexthdr))) {
905 NAPI_GRO_CB(p)->same_flow = 0;
906 continue;
907 }
908
909 NAPI_GRO_CB(p)->flush |= flush;
910 }
911
912 NAPI_GRO_CB(skb)->flush |= flush;
913
914 csum = skb->csum;
915 skb_postpull_rcsum(skb, iph, skb_network_header_len(skb));
916
917 pp = ops->gro_receive(head, skb);
918
919 skb->csum = csum;
920
921 out_unlock:
922 rcu_read_unlock();
923
924 out:
925 NAPI_GRO_CB(skb)->flush |= flush;
926
927 return pp;
928 }
929
930 static int ipv6_gro_complete(struct sk_buff *skb)
931 {
932 const struct inet6_protocol *ops;
933 struct ipv6hdr *iph = ipv6_hdr(skb);
934 int err = -ENOSYS;
935
936 iph->payload_len = htons(skb->len - skb_network_offset(skb) -
937 sizeof(*iph));
938
939 rcu_read_lock();
940 ops = rcu_dereference(inet6_protos[IPV6_GRO_CB(skb)->proto]);
941 if (WARN_ON(!ops || !ops->gro_complete))
942 goto out_unlock;
943
944 err = ops->gro_complete(skb);
945
946 out_unlock:
947 rcu_read_unlock();
948
949 return err;
950 }
951
952 static struct packet_type ipv6_packet_type __read_mostly = {
953 .type = cpu_to_be16(ETH_P_IPV6),
954 .func = ipv6_rcv,
955 .gso_send_check = ipv6_gso_send_check,
956 .gso_segment = ipv6_gso_segment,
957 .gro_receive = ipv6_gro_receive,
958 .gro_complete = ipv6_gro_complete,
959 };
960
961 static int __init ipv6_packet_init(void)
962 {
963 dev_add_pack(&ipv6_packet_type);
964 return 0;
965 }
966
967 static void ipv6_packet_cleanup(void)
968 {
969 dev_remove_pack(&ipv6_packet_type);
970 }
971
972 static int __net_init ipv6_init_mibs(struct net *net)
973 {
974 if (snmp_mib_init((void __percpu **)net->mib.udp_stats_in6,
975 sizeof(struct udp_mib),
976 __alignof__(struct udp_mib)) < 0)
977 return -ENOMEM;
978 if (snmp_mib_init((void __percpu **)net->mib.udplite_stats_in6,
979 sizeof(struct udp_mib),
980 __alignof__(struct udp_mib)) < 0)
981 goto err_udplite_mib;
982 if (snmp_mib_init((void __percpu **)net->mib.ipv6_statistics,
983 sizeof(struct ipstats_mib),
984 __alignof__(struct ipstats_mib)) < 0)
985 goto err_ip_mib;
986 if (snmp_mib_init((void __percpu **)net->mib.icmpv6_statistics,
987 sizeof(struct icmpv6_mib),
988 __alignof__(struct icmpv6_mib)) < 0)
989 goto err_icmp_mib;
990 if (snmp_mib_init((void __percpu **)net->mib.icmpv6msg_statistics,
991 sizeof(struct icmpv6msg_mib),
992 __alignof__(struct icmpv6msg_mib)) < 0)
993 goto err_icmpmsg_mib;
994 return 0;
995
996 err_icmpmsg_mib:
997 snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics);
998 err_icmp_mib:
999 snmp_mib_free((void __percpu **)net->mib.ipv6_statistics);
1000 err_ip_mib:
1001 snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6);
1002 err_udplite_mib:
1003 snmp_mib_free((void __percpu **)net->mib.udp_stats_in6);
1004 return -ENOMEM;
1005 }
1006
1007 static void ipv6_cleanup_mibs(struct net *net)
1008 {
1009 snmp_mib_free((void __percpu **)net->mib.udp_stats_in6);
1010 snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6);
1011 snmp_mib_free((void __percpu **)net->mib.ipv6_statistics);
1012 snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics);
1013 snmp_mib_free((void __percpu **)net->mib.icmpv6msg_statistics);
1014 }
1015
1016 static int __net_init inet6_net_init(struct net *net)
1017 {
1018 int err = 0;
1019
1020 net->ipv6.sysctl.bindv6only = 0;
1021 net->ipv6.sysctl.icmpv6_time = 1*HZ;
1022
1023 err = ipv6_init_mibs(net);
1024 if (err)
1025 return err;
1026 #ifdef CONFIG_PROC_FS
1027 err = udp6_proc_init(net);
1028 if (err)
1029 goto out;
1030 err = tcp6_proc_init(net);
1031 if (err)
1032 goto proc_tcp6_fail;
1033 err = ac6_proc_init(net);
1034 if (err)
1035 goto proc_ac6_fail;
1036 #endif
1037 return err;
1038
1039 #ifdef CONFIG_PROC_FS
1040 proc_ac6_fail:
1041 tcp6_proc_exit(net);
1042 proc_tcp6_fail:
1043 udp6_proc_exit(net);
1044 out:
1045 ipv6_cleanup_mibs(net);
1046 return err;
1047 #endif
1048 }
1049
1050 static void __net_exit inet6_net_exit(struct net *net)
1051 {
1052 #ifdef CONFIG_PROC_FS
1053 udp6_proc_exit(net);
1054 tcp6_proc_exit(net);
1055 ac6_proc_exit(net);
1056 #endif
1057 ipv6_cleanup_mibs(net);
1058 }
1059
1060 static struct pernet_operations inet6_net_ops = {
1061 .init = inet6_net_init,
1062 .exit = inet6_net_exit,
1063 };
1064
1065 static int __init inet6_init(void)
1066 {
1067 struct sk_buff *dummy_skb;
1068 struct list_head *r;
1069 int err = 0;
1070
1071 BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
1072
1073 /* Register the socket-side information for inet6_create. */
1074 for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
1075 INIT_LIST_HEAD(r);
1076
1077 if (disable_ipv6_mod) {
1078 printk(KERN_INFO
1079 "IPv6: Loaded, but administratively disabled, "
1080 "reboot required to enable\n");
1081 goto out;
1082 }
1083
1084 err = proto_register(&tcpv6_prot, 1);
1085 if (err)
1086 goto out;
1087
1088 err = proto_register(&udpv6_prot, 1);
1089 if (err)
1090 goto out_unregister_tcp_proto;
1091
1092 err = proto_register(&udplitev6_prot, 1);
1093 if (err)
1094 goto out_unregister_udp_proto;
1095
1096 err = proto_register(&rawv6_prot, 1);
1097 if (err)
1098 goto out_unregister_udplite_proto;
1099
1100
1101 /* We MUST register RAW sockets before we create the ICMP6,
1102 * IGMP6, or NDISC control sockets.
1103 */
1104 err = rawv6_init();
1105 if (err)
1106 goto out_unregister_raw_proto;
1107
1108 /* Register the family here so that the init calls below will
1109 * be able to create sockets. (?? is this dangerous ??)
1110 */
1111 err = sock_register(&inet6_family_ops);
1112 if (err)
1113 goto out_sock_register_fail;
1114
1115 #ifdef CONFIG_SYSCTL
1116 err = ipv6_static_sysctl_register();
1117 if (err)
1118 goto static_sysctl_fail;
1119 #endif
1120 /*
1121 * ipngwg API draft makes clear that the correct semantics
1122 * for TCP and UDP is to consider one TCP and UDP instance
1123 * in a host availiable by both INET and INET6 APIs and
1124 * able to communicate via both network protocols.
1125 */
1126
1127 err = register_pernet_subsys(&inet6_net_ops);
1128 if (err)
1129 goto register_pernet_fail;
1130 err = icmpv6_init();
1131 if (err)
1132 goto icmp_fail;
1133 err = ip6_mr_init();
1134 if (err)
1135 goto ipmr_fail;
1136 err = ndisc_init();
1137 if (err)
1138 goto ndisc_fail;
1139 err = igmp6_init();
1140 if (err)
1141 goto igmp_fail;
1142 err = ipv6_netfilter_init();
1143 if (err)
1144 goto netfilter_fail;
1145 /* Create /proc/foo6 entries. */
1146 #ifdef CONFIG_PROC_FS
1147 err = -ENOMEM;
1148 if (raw6_proc_init())
1149 goto proc_raw6_fail;
1150 if (udplite6_proc_init())
1151 goto proc_udplite6_fail;
1152 if (ipv6_misc_proc_init())
1153 goto proc_misc6_fail;
1154 if (if6_proc_init())
1155 goto proc_if6_fail;
1156 #endif
1157 err = ip6_route_init();
1158 if (err)
1159 goto ip6_route_fail;
1160 err = ip6_flowlabel_init();
1161 if (err)
1162 goto ip6_flowlabel_fail;
1163 err = addrconf_init();
1164 if (err)
1165 goto addrconf_fail;
1166
1167 /* Init v6 extension headers. */
1168 err = ipv6_exthdrs_init();
1169 if (err)
1170 goto ipv6_exthdrs_fail;
1171
1172 err = ipv6_frag_init();
1173 if (err)
1174 goto ipv6_frag_fail;
1175
1176 /* Init v6 transport protocols. */
1177 err = udpv6_init();
1178 if (err)
1179 goto udpv6_fail;
1180
1181 err = udplitev6_init();
1182 if (err)
1183 goto udplitev6_fail;
1184
1185 err = tcpv6_init();
1186 if (err)
1187 goto tcpv6_fail;
1188
1189 err = ipv6_packet_init();
1190 if (err)
1191 goto ipv6_packet_fail;
1192
1193 #ifdef CONFIG_SYSCTL
1194 err = ipv6_sysctl_register();
1195 if (err)
1196 goto sysctl_fail;
1197 #endif
1198 out:
1199 return err;
1200
1201 #ifdef CONFIG_SYSCTL
1202 sysctl_fail:
1203 ipv6_packet_cleanup();
1204 #endif
1205 ipv6_packet_fail:
1206 tcpv6_exit();
1207 tcpv6_fail:
1208 udplitev6_exit();
1209 udplitev6_fail:
1210 udpv6_exit();
1211 udpv6_fail:
1212 ipv6_frag_exit();
1213 ipv6_frag_fail:
1214 ipv6_exthdrs_exit();
1215 ipv6_exthdrs_fail:
1216 addrconf_cleanup();
1217 addrconf_fail:
1218 ip6_flowlabel_cleanup();
1219 ip6_flowlabel_fail:
1220 ip6_route_cleanup();
1221 ip6_route_fail:
1222 #ifdef CONFIG_PROC_FS
1223 if6_proc_exit();
1224 proc_if6_fail:
1225 ipv6_misc_proc_exit();
1226 proc_misc6_fail:
1227 udplite6_proc_exit();
1228 proc_udplite6_fail:
1229 raw6_proc_exit();
1230 proc_raw6_fail:
1231 #endif
1232 ipv6_netfilter_fini();
1233 netfilter_fail:
1234 igmp6_cleanup();
1235 igmp_fail:
1236 ndisc_cleanup();
1237 ndisc_fail:
1238 ip6_mr_cleanup();
1239 ipmr_fail:
1240 icmpv6_cleanup();
1241 icmp_fail:
1242 unregister_pernet_subsys(&inet6_net_ops);
1243 register_pernet_fail:
1244 #ifdef CONFIG_SYSCTL
1245 ipv6_static_sysctl_unregister();
1246 static_sysctl_fail:
1247 #endif
1248 sock_unregister(PF_INET6);
1249 rtnl_unregister_all(PF_INET6);
1250 out_sock_register_fail:
1251 rawv6_exit();
1252 out_unregister_raw_proto:
1253 proto_unregister(&rawv6_prot);
1254 out_unregister_udplite_proto:
1255 proto_unregister(&udplitev6_prot);
1256 out_unregister_udp_proto:
1257 proto_unregister(&udpv6_prot);
1258 out_unregister_tcp_proto:
1259 proto_unregister(&tcpv6_prot);
1260 goto out;
1261 }
1262 module_init(inet6_init);
1263
1264 static void __exit inet6_exit(void)
1265 {
1266 if (disable_ipv6_mod)
1267 return;
1268
1269 /* First of all disallow new sockets creation. */
1270 sock_unregister(PF_INET6);
1271 /* Disallow any further netlink messages */
1272 rtnl_unregister_all(PF_INET6);
1273
1274 #ifdef CONFIG_SYSCTL
1275 ipv6_sysctl_unregister();
1276 #endif
1277 udpv6_exit();
1278 udplitev6_exit();
1279 tcpv6_exit();
1280
1281 /* Cleanup code parts. */
1282 ipv6_packet_cleanup();
1283 ipv6_frag_exit();
1284 ipv6_exthdrs_exit();
1285 addrconf_cleanup();
1286 ip6_flowlabel_cleanup();
1287 ip6_route_cleanup();
1288 #ifdef CONFIG_PROC_FS
1289
1290 /* Cleanup code parts. */
1291 if6_proc_exit();
1292 ipv6_misc_proc_exit();
1293 udplite6_proc_exit();
1294 raw6_proc_exit();
1295 #endif
1296 ipv6_netfilter_fini();
1297 igmp6_cleanup();
1298 ndisc_cleanup();
1299 ip6_mr_cleanup();
1300 icmpv6_cleanup();
1301 rawv6_exit();
1302
1303 unregister_pernet_subsys(&inet6_net_ops);
1304 #ifdef CONFIG_SYSCTL
1305 ipv6_static_sysctl_unregister();
1306 #endif
1307 proto_unregister(&rawv6_prot);
1308 proto_unregister(&udplitev6_prot);
1309 proto_unregister(&udpv6_prot);
1310 proto_unregister(&tcpv6_prot);
1311
1312 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1313 }
1314 module_exit(inet6_exit);
1315
1316 MODULE_ALIAS_NETPROTO(PF_INET6);