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[MTD] [NAND] fsl_elbc_nand: ecclayout cleanups
[linux-2.6/linux-2.6-openrd.git] / net / ipv6 / af_inet6.c
blobe84b3fd17fb4de37e3212bd55892f132f38d6098
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 * $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>
25 #include <linux/capability.h>
26 #include <linux/errno.h>
27 #include <linux/types.h>
28 #include <linux/socket.h>
29 #include <linux/in.h>
30 #include <linux/kernel.h>
31 #include <linux/timer.h>
32 #include <linux/string.h>
33 #include <linux/sockios.h>
34 #include <linux/net.h>
35 #include <linux/fcntl.h>
36 #include <linux/mm.h>
37 #include <linux/interrupt.h>
38 #include <linux/proc_fs.h>
39 #include <linux/stat.h>
40 #include <linux/init.h>
41
42 #include <linux/inet.h>
43 #include <linux/netdevice.h>
44 #include <linux/icmpv6.h>
45 #include <linux/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/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 #ifdef CONFIG_IPV6_MROUTE
65 #include <linux/mroute6.h>
66 #endif
67
68 MODULE_AUTHOR("Cast of dozens");
69 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
70 MODULE_LICENSE("GPL");
71
72 /* The inetsw6 table contains everything that inet6_create needs to
73 * build a new socket.
74 */
75 static struct list_head inetsw6[SOCK_MAX];
76 static DEFINE_SPINLOCK(inetsw6_lock);
77
78 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
79 {
80 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
81
82 return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
83 }
84
85 static int inet6_create(struct net *net, struct socket *sock, int protocol)
86 {
87 struct inet_sock *inet;
88 struct ipv6_pinfo *np;
89 struct sock *sk;
90 struct list_head *p;
91 struct inet_protosw *answer;
92 struct proto *answer_prot;
93 unsigned char answer_flags;
94 char answer_no_check;
95 int try_loading_module = 0;
96 int err;
97
98 if (sock->type != SOCK_RAW &&
99 sock->type != SOCK_DGRAM &&
100 !inet_ehash_secret)
101 build_ehash_secret();
102
103 /* Look for the requested type/protocol pair. */
104 answer = NULL;
105 lookup_protocol:
106 err = -ESOCKTNOSUPPORT;
107 rcu_read_lock();
108 list_for_each_rcu(p, &inetsw6[sock->type]) {
109 answer = list_entry(p, struct inet_protosw, list);
110
111 /* Check the non-wild match. */
112 if (protocol == answer->protocol) {
113 if (protocol != IPPROTO_IP)
114 break;
115 } else {
116 /* Check for the two wild cases. */
117 if (IPPROTO_IP == protocol) {
118 protocol = answer->protocol;
119 break;
120 }
121 if (IPPROTO_IP == answer->protocol)
122 break;
123 }
124 err = -EPROTONOSUPPORT;
125 answer = NULL;
126 }
127
128 if (!answer) {
129 if (try_loading_module < 2) {
130 rcu_read_unlock();
131 /*
132 * Be more specific, e.g. net-pf-10-proto-132-type-1
133 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
134 */
135 if (++try_loading_module == 1)
136 request_module("net-pf-%d-proto-%d-type-%d",
137 PF_INET6, protocol, sock->type);
138 /*
139 * Fall back to generic, e.g. net-pf-10-proto-132
140 * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
141 */
142 else
143 request_module("net-pf-%d-proto-%d",
144 PF_INET6, protocol);
145 goto lookup_protocol;
146 } else
147 goto out_rcu_unlock;
148 }
149
150 err = -EPERM;
151 if (answer->capability > 0 && !capable(answer->capability))
152 goto out_rcu_unlock;
153
154 sock->ops = answer->ops;
155 answer_prot = answer->prot;
156 answer_no_check = answer->no_check;
157 answer_flags = answer->flags;
158 rcu_read_unlock();
159
160 BUG_TRAP(answer_prot->slab != NULL);
161
162 err = -ENOBUFS;
163 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot);
164 if (sk == NULL)
165 goto out;
166
167 sock_init_data(sock, sk);
168
169 err = 0;
170 sk->sk_no_check = answer_no_check;
171 if (INET_PROTOSW_REUSE & answer_flags)
172 sk->sk_reuse = 1;
173
174 inet = inet_sk(sk);
175 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
176
177 if (SOCK_RAW == sock->type) {
178 inet->num = protocol;
179 if (IPPROTO_RAW == protocol)
180 inet->hdrincl = 1;
181 }
182
183 sk->sk_destruct = inet_sock_destruct;
184 sk->sk_family = PF_INET6;
185 sk->sk_protocol = protocol;
186
187 sk->sk_backlog_rcv = answer->prot->backlog_rcv;
188
189 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
190 np->hop_limit = -1;
191 np->mcast_hops = -1;
192 np->mc_loop = 1;
193 np->pmtudisc = IPV6_PMTUDISC_WANT;
194 np->ipv6only = net->ipv6.sysctl.bindv6only;
195
196 /* Init the ipv4 part of the socket since we can have sockets
197 * using v6 API for ipv4.
198 */
199 inet->uc_ttl = -1;
200
201 inet->mc_loop = 1;
202 inet->mc_ttl = 1;
203 inet->mc_index = 0;
204 inet->mc_list = NULL;
205
206 if (ipv4_config.no_pmtu_disc)
207 inet->pmtudisc = IP_PMTUDISC_DONT;
208 else
209 inet->pmtudisc = IP_PMTUDISC_WANT;
210 /*
211 * Increment only the relevant sk_prot->socks debug field, this changes
212 * the previous behaviour of incrementing both the equivalent to
213 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
214 *
215 * This allows better debug granularity as we'll know exactly how many
216 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
217 * transport protocol socks. -acme
218 */
219 sk_refcnt_debug_inc(sk);
220
221 if (inet->num) {
222 /* It assumes that any protocol which allows
223 * the user to assign a number at socket
224 * creation time automatically shares.
225 */
226 inet->sport = htons(inet->num);
227 sk->sk_prot->hash(sk);
228 }
229 if (sk->sk_prot->init) {
230 err = sk->sk_prot->init(sk);
231 if (err) {
232 sk_common_release(sk);
233 goto out;
234 }
235 }
236 out:
237 return err;
238 out_rcu_unlock:
239 rcu_read_unlock();
240 goto out;
241 }
242
243
244 /* bind for INET6 API */
245 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
246 {
247 struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
248 struct sock *sk = sock->sk;
249 struct inet_sock *inet = inet_sk(sk);
250 struct ipv6_pinfo *np = inet6_sk(sk);
251 struct net *net = sock_net(sk);
252 __be32 v4addr = 0;
253 unsigned short snum;
254 int addr_type = 0;
255 int err = 0;
256
257 /* If the socket has its own bind function then use it. */
258 if (sk->sk_prot->bind)
259 return sk->sk_prot->bind(sk, uaddr, addr_len);
260
261 if (addr_len < SIN6_LEN_RFC2133)
262 return -EINVAL;
263 addr_type = ipv6_addr_type(&addr->sin6_addr);
264 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
265 return -EINVAL;
266
267 snum = ntohs(addr->sin6_port);
268 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
269 return -EACCES;
270
271 lock_sock(sk);
272
273 /* Check these errors (active socket, double bind). */
274 if (sk->sk_state != TCP_CLOSE || inet->num) {
275 err = -EINVAL;
276 goto out;
277 }
278
279 /* Check if the address belongs to the host. */
280 if (addr_type == IPV6_ADDR_MAPPED) {
281 v4addr = addr->sin6_addr.s6_addr32[3];
282 if (inet_addr_type(net, v4addr) != RTN_LOCAL) {
283 err = -EADDRNOTAVAIL;
284 goto out;
285 }
286 } else {
287 if (addr_type != IPV6_ADDR_ANY) {
288 struct net_device *dev = NULL;
289
290 if (addr_type & IPV6_ADDR_LINKLOCAL) {
291 if (addr_len >= sizeof(struct sockaddr_in6) &&
292 addr->sin6_scope_id) {
293 /* Override any existing binding, if another one
294 * is supplied by user.
295 */
296 sk->sk_bound_dev_if = addr->sin6_scope_id;
297 }
298
299 /* Binding to link-local address requires an interface */
300 if (!sk->sk_bound_dev_if) {
301 err = -EINVAL;
302 goto out;
303 }
304 dev = dev_get_by_index(net, sk->sk_bound_dev_if);
305 if (!dev) {
306 err = -ENODEV;
307 goto out;
308 }
309 }
310
311 /* ipv4 addr of the socket is invalid. Only the
312 * unspecified and mapped address have a v4 equivalent.
313 */
314 v4addr = LOOPBACK4_IPV6;
315 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
316 if (!ipv6_chk_addr(net, &addr->sin6_addr,
317 dev, 0)) {
318 if (dev)
319 dev_put(dev);
320 err = -EADDRNOTAVAIL;
321 goto out;
322 }
323 }
324 if (dev)
325 dev_put(dev);
326 }
327 }
328
329 inet->rcv_saddr = v4addr;
330 inet->saddr = v4addr;
331
332 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
333
334 if (!(addr_type & IPV6_ADDR_MULTICAST))
335 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
336
337 /* Make sure we are allowed to bind here. */
338 if (sk->sk_prot->get_port(sk, snum)) {
339 inet_reset_saddr(sk);
340 err = -EADDRINUSE;
341 goto out;
342 }
343
344 if (addr_type != IPV6_ADDR_ANY)
345 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
346 if (snum)
347 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
348 inet->sport = htons(inet->num);
349 inet->dport = 0;
350 inet->daddr = 0;
351 out:
352 release_sock(sk);
353 return err;
354 }
355
356 EXPORT_SYMBOL(inet6_bind);
357
358 int inet6_release(struct socket *sock)
359 {
360 struct sock *sk = sock->sk;
361
362 if (sk == NULL)
363 return -EINVAL;
364
365 /* Free mc lists */
366 ipv6_sock_mc_close(sk);
367
368 /* Free ac lists */
369 ipv6_sock_ac_close(sk);
370
371 return inet_release(sock);
372 }
373
374 EXPORT_SYMBOL(inet6_release);
375
376 int inet6_destroy_sock(struct sock *sk)
377 {
378 struct ipv6_pinfo *np = inet6_sk(sk);
379 struct sk_buff *skb;
380 struct ipv6_txoptions *opt;
381
382 /* Release rx options */
383
384 if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
385 kfree_skb(skb);
386
387 /* Free flowlabels */
388 fl6_free_socklist(sk);
389
390 /* Free tx options */
391
392 if ((opt = xchg(&np->opt, NULL)) != NULL)
393 sock_kfree_s(sk, opt, opt->tot_len);
394
395 return 0;
396 }
397
398 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
399
400 /*
401 * This does both peername and sockname.
402 */
403
404 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
405 int *uaddr_len, int peer)
406 {
407 struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
408 struct sock *sk = sock->sk;
409 struct inet_sock *inet = inet_sk(sk);
410 struct ipv6_pinfo *np = inet6_sk(sk);
411
412 sin->sin6_family = AF_INET6;
413 sin->sin6_flowinfo = 0;
414 sin->sin6_scope_id = 0;
415 if (peer) {
416 if (!inet->dport)
417 return -ENOTCONN;
418 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
419 peer == 1)
420 return -ENOTCONN;
421 sin->sin6_port = inet->dport;
422 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
423 if (np->sndflow)
424 sin->sin6_flowinfo = np->flow_label;
425 } else {
426 if (ipv6_addr_any(&np->rcv_saddr))
427 ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
428 else
429 ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
430
431 sin->sin6_port = inet->sport;
432 }
433 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
434 sin->sin6_scope_id = sk->sk_bound_dev_if;
435 *uaddr_len = sizeof(*sin);
436 return(0);
437 }
438
439 EXPORT_SYMBOL(inet6_getname);
440
441 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
442 {
443 struct sock *sk = sock->sk;
444 struct net *net = sock_net(sk);
445
446 switch(cmd)
447 {
448 case SIOCGSTAMP:
449 return sock_get_timestamp(sk, (struct timeval __user *)arg);
450
451 case SIOCGSTAMPNS:
452 return sock_get_timestampns(sk, (struct timespec __user *)arg);
453
454 case SIOCADDRT:
455 case SIOCDELRT:
456
457 return(ipv6_route_ioctl(net, cmd, (void __user *)arg));
458
459 case SIOCSIFADDR:
460 return addrconf_add_ifaddr(net, (void __user *) arg);
461 case SIOCDIFADDR:
462 return addrconf_del_ifaddr(net, (void __user *) arg);
463 case SIOCSIFDSTADDR:
464 return addrconf_set_dstaddr(net, (void __user *) arg);
465 default:
466 if (!sk->sk_prot->ioctl)
467 return -ENOIOCTLCMD;
468 return sk->sk_prot->ioctl(sk, cmd, arg);
469 }
470 /*NOTREACHED*/
471 return(0);
472 }
473
474 EXPORT_SYMBOL(inet6_ioctl);
475
476 const struct proto_ops inet6_stream_ops = {
477 .family = PF_INET6,
478 .owner = THIS_MODULE,
479 .release = inet6_release,
480 .bind = inet6_bind,
481 .connect = inet_stream_connect, /* ok */
482 .socketpair = sock_no_socketpair, /* a do nothing */
483 .accept = inet_accept, /* ok */
484 .getname = inet6_getname,
485 .poll = tcp_poll, /* ok */
486 .ioctl = inet6_ioctl, /* must change */
487 .listen = inet_listen, /* ok */
488 .shutdown = inet_shutdown, /* ok */
489 .setsockopt = sock_common_setsockopt, /* ok */
490 .getsockopt = sock_common_getsockopt, /* ok */
491 .sendmsg = tcp_sendmsg, /* ok */
492 .recvmsg = sock_common_recvmsg, /* ok */
493 .mmap = sock_no_mmap,
494 .sendpage = tcp_sendpage,
495 .splice_read = tcp_splice_read,
496 #ifdef CONFIG_COMPAT
497 .compat_setsockopt = compat_sock_common_setsockopt,
498 .compat_getsockopt = compat_sock_common_getsockopt,
499 #endif
500 };
501
502 const struct proto_ops inet6_dgram_ops = {
503 .family = PF_INET6,
504 .owner = THIS_MODULE,
505 .release = inet6_release,
506 .bind = inet6_bind,
507 .connect = inet_dgram_connect, /* ok */
508 .socketpair = sock_no_socketpair, /* a do nothing */
509 .accept = sock_no_accept, /* a do nothing */
510 .getname = inet6_getname,
511 .poll = udp_poll, /* ok */
512 .ioctl = inet6_ioctl, /* must change */
513 .listen = sock_no_listen, /* ok */
514 .shutdown = inet_shutdown, /* ok */
515 .setsockopt = sock_common_setsockopt, /* ok */
516 .getsockopt = sock_common_getsockopt, /* ok */
517 .sendmsg = inet_sendmsg, /* ok */
518 .recvmsg = sock_common_recvmsg, /* ok */
519 .mmap = sock_no_mmap,
520 .sendpage = sock_no_sendpage,
521 #ifdef CONFIG_COMPAT
522 .compat_setsockopt = compat_sock_common_setsockopt,
523 .compat_getsockopt = compat_sock_common_getsockopt,
524 #endif
525 };
526
527 static struct net_proto_family inet6_family_ops = {
528 .family = PF_INET6,
529 .create = inet6_create,
530 .owner = THIS_MODULE,
531 };
532
533 int inet6_register_protosw(struct inet_protosw *p)
534 {
535 struct list_head *lh;
536 struct inet_protosw *answer;
537 struct list_head *last_perm;
538 int protocol = p->protocol;
539 int ret;
540
541 spin_lock_bh(&inetsw6_lock);
542
543 ret = -EINVAL;
544 if (p->type >= SOCK_MAX)
545 goto out_illegal;
546
547 /* If we are trying to override a permanent protocol, bail. */
548 answer = NULL;
549 ret = -EPERM;
550 last_perm = &inetsw6[p->type];
551 list_for_each(lh, &inetsw6[p->type]) {
552 answer = list_entry(lh, struct inet_protosw, list);
553
554 /* Check only the non-wild match. */
555 if (INET_PROTOSW_PERMANENT & answer->flags) {
556 if (protocol == answer->protocol)
557 break;
558 last_perm = lh;
559 }
560
561 answer = NULL;
562 }
563 if (answer)
564 goto out_permanent;
565
566 /* Add the new entry after the last permanent entry if any, so that
567 * the new entry does not override a permanent entry when matched with
568 * a wild-card protocol. But it is allowed to override any existing
569 * non-permanent entry. This means that when we remove this entry, the
570 * system automatically returns to the old behavior.
571 */
572 list_add_rcu(&p->list, last_perm);
573 ret = 0;
574 out:
575 spin_unlock_bh(&inetsw6_lock);
576 return ret;
577
578 out_permanent:
579 printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
580 protocol);
581 goto out;
582
583 out_illegal:
584 printk(KERN_ERR
585 "Ignoring attempt to register invalid socket type %d.\n",
586 p->type);
587 goto out;
588 }
589
590 EXPORT_SYMBOL(inet6_register_protosw);
591
592 void
593 inet6_unregister_protosw(struct inet_protosw *p)
594 {
595 if (INET_PROTOSW_PERMANENT & p->flags) {
596 printk(KERN_ERR
597 "Attempt to unregister permanent protocol %d.\n",
598 p->protocol);
599 } else {
600 spin_lock_bh(&inetsw6_lock);
601 list_del_rcu(&p->list);
602 spin_unlock_bh(&inetsw6_lock);
603
604 synchronize_net();
605 }
606 }
607
608 EXPORT_SYMBOL(inet6_unregister_protosw);
609
610 int inet6_sk_rebuild_header(struct sock *sk)
611 {
612 int err;
613 struct dst_entry *dst;
614 struct ipv6_pinfo *np = inet6_sk(sk);
615
616 dst = __sk_dst_check(sk, np->dst_cookie);
617
618 if (dst == NULL) {
619 struct inet_sock *inet = inet_sk(sk);
620 struct in6_addr *final_p = NULL, final;
621 struct flowi fl;
622
623 memset(&fl, 0, sizeof(fl));
624 fl.proto = sk->sk_protocol;
625 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
626 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
627 fl.fl6_flowlabel = np->flow_label;
628 fl.oif = sk->sk_bound_dev_if;
629 fl.fl_ip_dport = inet->dport;
630 fl.fl_ip_sport = inet->sport;
631 security_sk_classify_flow(sk, &fl);
632
633 if (np->opt && np->opt->srcrt) {
634 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
635 ipv6_addr_copy(&final, &fl.fl6_dst);
636 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
637 final_p = &final;
638 }
639
640 err = ip6_dst_lookup(sk, &dst, &fl);
641 if (err) {
642 sk->sk_route_caps = 0;
643 return err;
644 }
645 if (final_p)
646 ipv6_addr_copy(&fl.fl6_dst, final_p);
647
648 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
649 sk->sk_err_soft = -err;
650 return err;
651 }
652
653 __ip6_dst_store(sk, dst, NULL, NULL);
654 }
655
656 return 0;
657 }
658
659 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
660
661 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
662 {
663 struct ipv6_pinfo *np = inet6_sk(sk);
664 struct inet6_skb_parm *opt = IP6CB(skb);
665
666 if (np->rxopt.all) {
667 if ((opt->hop && (np->rxopt.bits.hopopts ||
668 np->rxopt.bits.ohopopts)) ||
669 ((IPV6_FLOWINFO_MASK &
670 *(__be32 *)skb_network_header(skb)) &&
671 np->rxopt.bits.rxflow) ||
672 (opt->srcrt && (np->rxopt.bits.srcrt ||
673 np->rxopt.bits.osrcrt)) ||
674 ((opt->dst1 || opt->dst0) &&
675 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
676 return 1;
677 }
678 return 0;
679 }
680
681 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
682
683 static struct inet6_protocol *ipv6_gso_pull_exthdrs(struct sk_buff *skb,
684 int proto)
685 {
686 struct inet6_protocol *ops = NULL;
687
688 for (;;) {
689 struct ipv6_opt_hdr *opth;
690 int len;
691
692 if (proto != NEXTHDR_HOP) {
693 ops = rcu_dereference(inet6_protos[proto]);
694
695 if (unlikely(!ops))
696 break;
697
698 if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
699 break;
700 }
701
702 if (unlikely(!pskb_may_pull(skb, 8)))
703 break;
704
705 opth = (void *)skb->data;
706 len = ipv6_optlen(opth);
707
708 if (unlikely(!pskb_may_pull(skb, len)))
709 break;
710
711 proto = opth->nexthdr;
712 __skb_pull(skb, len);
713 }
714
715 return ops;
716 }
717
718 static int ipv6_gso_send_check(struct sk_buff *skb)
719 {
720 struct ipv6hdr *ipv6h;
721 struct inet6_protocol *ops;
722 int err = -EINVAL;
723
724 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
725 goto out;
726
727 ipv6h = ipv6_hdr(skb);
728 __skb_pull(skb, sizeof(*ipv6h));
729 err = -EPROTONOSUPPORT;
730
731 rcu_read_lock();
732 ops = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
733 if (likely(ops && ops->gso_send_check)) {
734 skb_reset_transport_header(skb);
735 err = ops->gso_send_check(skb);
736 }
737 rcu_read_unlock();
738
739 out:
740 return err;
741 }
742
743 static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features)
744 {
745 struct sk_buff *segs = ERR_PTR(-EINVAL);
746 struct ipv6hdr *ipv6h;
747 struct inet6_protocol *ops;
748
749 if (!(features & NETIF_F_V6_CSUM))
750 features &= ~NETIF_F_SG;
751
752 if (unlikely(skb_shinfo(skb)->gso_type &
753 ~(SKB_GSO_UDP |
754 SKB_GSO_DODGY |
755 SKB_GSO_TCP_ECN |
756 SKB_GSO_TCPV6 |
757 0)))
758 goto out;
759
760 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
761 goto out;
762
763 ipv6h = ipv6_hdr(skb);
764 __skb_pull(skb, sizeof(*ipv6h));
765 segs = ERR_PTR(-EPROTONOSUPPORT);
766
767 rcu_read_lock();
768 ops = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
769 if (likely(ops && ops->gso_segment)) {
770 skb_reset_transport_header(skb);
771 segs = ops->gso_segment(skb, features);
772 }
773 rcu_read_unlock();
774
775 if (unlikely(IS_ERR(segs)))
776 goto out;
777
778 for (skb = segs; skb; skb = skb->next) {
779 ipv6h = ipv6_hdr(skb);
780 ipv6h->payload_len = htons(skb->len - skb->mac_len -
781 sizeof(*ipv6h));
782 }
783
784 out:
785 return segs;
786 }
787
788 static struct packet_type ipv6_packet_type = {
789 .type = __constant_htons(ETH_P_IPV6),
790 .func = ipv6_rcv,
791 .gso_send_check = ipv6_gso_send_check,
792 .gso_segment = ipv6_gso_segment,
793 };
794
795 static int __init ipv6_packet_init(void)
796 {
797 dev_add_pack(&ipv6_packet_type);
798 return 0;
799 }
800
801 static void ipv6_packet_cleanup(void)
802 {
803 dev_remove_pack(&ipv6_packet_type);
804 }
805
806 static int __init init_ipv6_mibs(void)
807 {
808 if (snmp_mib_init((void **)ipv6_statistics,
809 sizeof(struct ipstats_mib)) < 0)
810 goto err_ip_mib;
811 if (snmp_mib_init((void **)icmpv6_statistics,
812 sizeof(struct icmpv6_mib)) < 0)
813 goto err_icmp_mib;
814 if (snmp_mib_init((void **)icmpv6msg_statistics,
815 sizeof(struct icmpv6msg_mib)) < 0)
816 goto err_icmpmsg_mib;
817 if (snmp_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib)) < 0)
818 goto err_udp_mib;
819 if (snmp_mib_init((void **)udplite_stats_in6,
820 sizeof (struct udp_mib)) < 0)
821 goto err_udplite_mib;
822 return 0;
823
824 err_udplite_mib:
825 snmp_mib_free((void **)udp_stats_in6);
826 err_udp_mib:
827 snmp_mib_free((void **)icmpv6msg_statistics);
828 err_icmpmsg_mib:
829 snmp_mib_free((void **)icmpv6_statistics);
830 err_icmp_mib:
831 snmp_mib_free((void **)ipv6_statistics);
832 err_ip_mib:
833 return -ENOMEM;
834
835 }
836
837 static void cleanup_ipv6_mibs(void)
838 {
839 snmp_mib_free((void **)ipv6_statistics);
840 snmp_mib_free((void **)icmpv6_statistics);
841 snmp_mib_free((void **)icmpv6msg_statistics);
842 snmp_mib_free((void **)udp_stats_in6);
843 snmp_mib_free((void **)udplite_stats_in6);
844 }
845
846 static int inet6_net_init(struct net *net)
847 {
848 int err = 0;
849
850 net->ipv6.sysctl.bindv6only = 0;
851 net->ipv6.sysctl.flush_delay = 0;
852 net->ipv6.sysctl.ip6_rt_max_size = 4096;
853 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
854 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
855 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
856 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
857 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
858 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
859 net->ipv6.sysctl.icmpv6_time = 1*HZ;
860
861 #ifdef CONFIG_PROC_FS
862 err = udp6_proc_init(net);
863 if (err)
864 goto out;
865 err = tcp6_proc_init(net);
866 if (err)
867 goto proc_tcp6_fail;
868 err = ac6_proc_init(net);
869 if (err)
870 goto proc_ac6_fail;
871 out:
872 #endif
873 return err;
874
875 #ifdef CONFIG_PROC_FS
876 proc_ac6_fail:
877 tcp6_proc_exit(net);
878 proc_tcp6_fail:
879 udp6_proc_exit(net);
880 goto out;
881 #endif
882 }
883
884 static void inet6_net_exit(struct net *net)
885 {
886 #ifdef CONFIG_PROC_FS
887 udp6_proc_exit(net);
888 tcp6_proc_exit(net);
889 ac6_proc_exit(net);
890 #endif
891 }
892
893 static struct pernet_operations inet6_net_ops = {
894 .init = inet6_net_init,
895 .exit = inet6_net_exit,
896 };
897
898 static int __init inet6_init(void)
899 {
900 struct sk_buff *dummy_skb;
901 struct list_head *r;
902 int err;
903
904 BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
905
906 err = proto_register(&tcpv6_prot, 1);
907 if (err)
908 goto out;
909
910 err = proto_register(&udpv6_prot, 1);
911 if (err)
912 goto out_unregister_tcp_proto;
913
914 err = proto_register(&udplitev6_prot, 1);
915 if (err)
916 goto out_unregister_udp_proto;
917
918 err = proto_register(&rawv6_prot, 1);
919 if (err)
920 goto out_unregister_udplite_proto;
921
922
923 /* Register the socket-side information for inet6_create. */
924 for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
925 INIT_LIST_HEAD(r);
926
927 /* We MUST register RAW sockets before we create the ICMP6,
928 * IGMP6, or NDISC control sockets.
929 */
930 err = rawv6_init();
931 if (err)
932 goto out_unregister_raw_proto;
933
934 /* Register the family here so that the init calls below will
935 * be able to create sockets. (?? is this dangerous ??)
936 */
937 err = sock_register(&inet6_family_ops);
938 if (err)
939 goto out_sock_register_fail;
940
941 /* Initialise ipv6 mibs */
942 err = init_ipv6_mibs();
943 if (err)
944 goto out_unregister_sock;
945
946 /*
947 * ipngwg API draft makes clear that the correct semantics
948 * for TCP and UDP is to consider one TCP and UDP instance
949 * in a host availiable by both INET and INET6 APIs and
950 * able to communicate via both network protocols.
951 */
952
953 err = register_pernet_subsys(&inet6_net_ops);
954 if (err)
955 goto register_pernet_fail;
956 err = icmpv6_init();
957 if (err)
958 goto icmp_fail;
959 #ifdef CONFIG_IPV6_MROUTE
960 ip6_mr_init();
961 #endif
962 err = ndisc_init();
963 if (err)
964 goto ndisc_fail;
965 err = igmp6_init();
966 if (err)
967 goto igmp_fail;
968 err = ipv6_netfilter_init();
969 if (err)
970 goto netfilter_fail;
971 /* Create /proc/foo6 entries. */
972 #ifdef CONFIG_PROC_FS
973 err = -ENOMEM;
974 if (raw6_proc_init())
975 goto proc_raw6_fail;
976 if (udplite6_proc_init())
977 goto proc_udplite6_fail;
978 if (ipv6_misc_proc_init())
979 goto proc_misc6_fail;
980 if (if6_proc_init())
981 goto proc_if6_fail;
982 #endif
983 err = ip6_route_init();
984 if (err)
985 goto ip6_route_fail;
986 err = ip6_flowlabel_init();
987 if (err)
988 goto ip6_flowlabel_fail;
989 err = addrconf_init();
990 if (err)
991 goto addrconf_fail;
992
993 /* Init v6 extension headers. */
994 err = ipv6_exthdrs_init();
995 if (err)
996 goto ipv6_exthdrs_fail;
997
998 err = ipv6_frag_init();
999 if (err)
1000 goto ipv6_frag_fail;
1001
1002 /* Init v6 transport protocols. */
1003 err = udpv6_init();
1004 if (err)
1005 goto udpv6_fail;
1006
1007 err = udplitev6_init();
1008 if (err)
1009 goto udplitev6_fail;
1010
1011 err = tcpv6_init();
1012 if (err)
1013 goto tcpv6_fail;
1014
1015 err = ipv6_packet_init();
1016 if (err)
1017 goto ipv6_packet_fail;
1018
1019 #ifdef CONFIG_SYSCTL
1020 err = ipv6_sysctl_register();
1021 if (err)
1022 goto sysctl_fail;
1023 #endif
1024 out:
1025 return err;
1026
1027 #ifdef CONFIG_SYSCTL
1028 sysctl_fail:
1029 ipv6_packet_cleanup();
1030 #endif
1031 ipv6_packet_fail:
1032 tcpv6_exit();
1033 tcpv6_fail:
1034 udplitev6_exit();
1035 udplitev6_fail:
1036 udpv6_exit();
1037 udpv6_fail:
1038 ipv6_frag_exit();
1039 ipv6_frag_fail:
1040 ipv6_exthdrs_exit();
1041 ipv6_exthdrs_fail:
1042 addrconf_cleanup();
1043 addrconf_fail:
1044 ip6_flowlabel_cleanup();
1045 ip6_flowlabel_fail:
1046 ip6_route_cleanup();
1047 ip6_route_fail:
1048 #ifdef CONFIG_PROC_FS
1049 if6_proc_exit();
1050 proc_if6_fail:
1051 ipv6_misc_proc_exit();
1052 proc_misc6_fail:
1053 udplite6_proc_exit();
1054 proc_udplite6_fail:
1055 raw6_proc_exit();
1056 proc_raw6_fail:
1057 #endif
1058 ipv6_netfilter_fini();
1059 netfilter_fail:
1060 igmp6_cleanup();
1061 igmp_fail:
1062 ndisc_cleanup();
1063 ndisc_fail:
1064 icmpv6_cleanup();
1065 icmp_fail:
1066 unregister_pernet_subsys(&inet6_net_ops);
1067 register_pernet_fail:
1068 cleanup_ipv6_mibs();
1069 out_unregister_sock:
1070 sock_unregister(PF_INET6);
1071 rtnl_unregister_all(PF_INET6);
1072 out_sock_register_fail:
1073 rawv6_exit();
1074 out_unregister_raw_proto:
1075 proto_unregister(&rawv6_prot);
1076 out_unregister_udplite_proto:
1077 proto_unregister(&udplitev6_prot);
1078 out_unregister_udp_proto:
1079 proto_unregister(&udpv6_prot);
1080 out_unregister_tcp_proto:
1081 proto_unregister(&tcpv6_prot);
1082 goto out;
1083 }
1084 module_init(inet6_init);
1085
1086 static void __exit inet6_exit(void)
1087 {
1088 /* First of all disallow new sockets creation. */
1089 sock_unregister(PF_INET6);
1090 /* Disallow any further netlink messages */
1091 rtnl_unregister_all(PF_INET6);
1092
1093 #ifdef CONFIG_SYSCTL
1094 ipv6_sysctl_unregister();
1095 #endif
1096 udpv6_exit();
1097 udplitev6_exit();
1098 tcpv6_exit();
1099
1100 /* Cleanup code parts. */
1101 ipv6_packet_cleanup();
1102 ipv6_frag_exit();
1103 ipv6_exthdrs_exit();
1104 addrconf_cleanup();
1105 ip6_flowlabel_cleanup();
1106 ip6_route_cleanup();
1107 #ifdef CONFIG_PROC_FS
1108
1109 /* Cleanup code parts. */
1110 if6_proc_exit();
1111 ipv6_misc_proc_exit();
1112 udplite6_proc_exit();
1113 raw6_proc_exit();
1114 #endif
1115 ipv6_netfilter_fini();
1116 igmp6_cleanup();
1117 ndisc_cleanup();
1118 icmpv6_cleanup();
1119 rawv6_exit();
1120
1121 unregister_pernet_subsys(&inet6_net_ops);
1122 cleanup_ipv6_mibs();
1123 proto_unregister(&rawv6_prot);
1124 proto_unregister(&udplitev6_prot);
1125 proto_unregister(&udpv6_prot);
1126 proto_unregister(&tcpv6_prot);
1127 }
1128 module_exit(inet6_exit);
1129
1130 MODULE_ALIAS_NETPROTO(PF_INET6);
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