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lost sysctl fix
[mirror_ubuntu-artful-kernel.git] / net / ipv6 / af_inet6.c
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
40 #include <linux/inet.h>
41 #include <linux/netdevice.h>
42 #include <linux/icmpv6.h>
43 #include <linux/netfilter_ipv6.h>
44
45 #include <net/ip.h>
46 #include <net/ipv6.h>
47 #include <net/udp.h>
48 #include <net/udplite.h>
49 #include <net/tcp.h>
50 #include <net/ipip.h>
51 #include <net/protocol.h>
52 #include <net/inet_common.h>
53 #include <net/transp_v6.h>
54 #include <net/ip6_route.h>
55 #include <net/addrconf.h>
56 #ifdef CONFIG_IPV6_TUNNEL
57 #include <net/ip6_tunnel.h>
58 #endif
59
60 #include <asm/uaccess.h>
61 #include <asm/system.h>
62 #include <linux/mroute6.h>
63
64 MODULE_AUTHOR("Cast of dozens");
65 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
66 MODULE_LICENSE("GPL");
67
68 /* The inetsw6 table contains everything that inet6_create needs to
69 * build a new socket.
70 */
71 static struct list_head inetsw6[SOCK_MAX];
72 static DEFINE_SPINLOCK(inetsw6_lock);
73
74 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
75 {
76 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
77
78 return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
79 }
80
81 static int inet6_create(struct net *net, struct socket *sock, int protocol)
82 {
83 struct inet_sock *inet;
84 struct ipv6_pinfo *np;
85 struct sock *sk;
86 struct inet_protosw *answer;
87 struct proto *answer_prot;
88 unsigned char answer_flags;
89 char answer_no_check;
90 int try_loading_module = 0;
91 int err;
92
93 if (sock->type != SOCK_RAW &&
94 sock->type != SOCK_DGRAM &&
95 !inet_ehash_secret)
96 build_ehash_secret();
97
98 /* Look for the requested type/protocol pair. */
99 lookup_protocol:
100 err = -ESOCKTNOSUPPORT;
101 rcu_read_lock();
102 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
103
104 err = 0;
105 /* Check the non-wild match. */
106 if (protocol == answer->protocol) {
107 if (protocol != IPPROTO_IP)
108 break;
109 } else {
110 /* Check for the two wild cases. */
111 if (IPPROTO_IP == protocol) {
112 protocol = answer->protocol;
113 break;
114 }
115 if (IPPROTO_IP == answer->protocol)
116 break;
117 }
118 err = -EPROTONOSUPPORT;
119 }
120
121 if (err) {
122 if (try_loading_module < 2) {
123 rcu_read_unlock();
124 /*
125 * Be more specific, e.g. net-pf-10-proto-132-type-1
126 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
127 */
128 if (++try_loading_module == 1)
129 request_module("net-pf-%d-proto-%d-type-%d",
130 PF_INET6, protocol, sock->type);
131 /*
132 * Fall back to generic, e.g. net-pf-10-proto-132
133 * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
134 */
135 else
136 request_module("net-pf-%d-proto-%d",
137 PF_INET6, protocol);
138 goto lookup_protocol;
139 } else
140 goto out_rcu_unlock;
141 }
142
143 err = -EPERM;
144 if (answer->capability > 0 && !capable(answer->capability))
145 goto out_rcu_unlock;
146
147 sock->ops = answer->ops;
148 answer_prot = answer->prot;
149 answer_no_check = answer->no_check;
150 answer_flags = answer->flags;
151 rcu_read_unlock();
152
153 WARN_ON(answer_prot->slab == NULL);
154
155 err = -ENOBUFS;
156 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot);
157 if (sk == NULL)
158 goto out;
159
160 sock_init_data(sock, sk);
161
162 err = 0;
163 sk->sk_no_check = answer_no_check;
164 if (INET_PROTOSW_REUSE & answer_flags)
165 sk->sk_reuse = 1;
166
167 inet = inet_sk(sk);
168 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
169
170 if (SOCK_RAW == sock->type) {
171 inet->num = protocol;
172 if (IPPROTO_RAW == protocol)
173 inet->hdrincl = 1;
174 }
175
176 sk->sk_destruct = inet_sock_destruct;
177 sk->sk_family = PF_INET6;
178 sk->sk_protocol = protocol;
179
180 sk->sk_backlog_rcv = answer->prot->backlog_rcv;
181
182 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
183 np->hop_limit = -1;
184 np->mcast_hops = -1;
185 np->mc_loop = 1;
186 np->pmtudisc = IPV6_PMTUDISC_WANT;
187 np->ipv6only = net->ipv6.sysctl.bindv6only;
188
189 /* Init the ipv4 part of the socket since we can have sockets
190 * using v6 API for ipv4.
191 */
192 inet->uc_ttl = -1;
193
194 inet->mc_loop = 1;
195 inet->mc_ttl = 1;
196 inet->mc_index = 0;
197 inet->mc_list = NULL;
198
199 if (ipv4_config.no_pmtu_disc)
200 inet->pmtudisc = IP_PMTUDISC_DONT;
201 else
202 inet->pmtudisc = IP_PMTUDISC_WANT;
203 /*
204 * Increment only the relevant sk_prot->socks debug field, this changes
205 * the previous behaviour of incrementing both the equivalent to
206 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
207 *
208 * This allows better debug granularity as we'll know exactly how many
209 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
210 * transport protocol socks. -acme
211 */
212 sk_refcnt_debug_inc(sk);
213
214 if (inet->num) {
215 /* It assumes that any protocol which allows
216 * the user to assign a number at socket
217 * creation time automatically shares.
218 */
219 inet->sport = htons(inet->num);
220 sk->sk_prot->hash(sk);
221 }
222 if (sk->sk_prot->init) {
223 err = sk->sk_prot->init(sk);
224 if (err) {
225 sk_common_release(sk);
226 goto out;
227 }
228 }
229 out:
230 return err;
231 out_rcu_unlock:
232 rcu_read_unlock();
233 goto out;
234 }
235
236
237 /* bind for INET6 API */
238 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
239 {
240 struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
241 struct sock *sk = sock->sk;
242 struct inet_sock *inet = inet_sk(sk);
243 struct ipv6_pinfo *np = inet6_sk(sk);
244 struct net *net = sock_net(sk);
245 __be32 v4addr = 0;
246 unsigned short snum;
247 int addr_type = 0;
248 int err = 0;
249
250 /* If the socket has its own bind function then use it. */
251 if (sk->sk_prot->bind)
252 return sk->sk_prot->bind(sk, uaddr, addr_len);
253
254 if (addr_len < SIN6_LEN_RFC2133)
255 return -EINVAL;
256 addr_type = ipv6_addr_type(&addr->sin6_addr);
257 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
258 return -EINVAL;
259
260 snum = ntohs(addr->sin6_port);
261 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
262 return -EACCES;
263
264 lock_sock(sk);
265
266 /* Check these errors (active socket, double bind). */
267 if (sk->sk_state != TCP_CLOSE || inet->num) {
268 err = -EINVAL;
269 goto out;
270 }
271
272 /* Check if the address belongs to the host. */
273 if (addr_type == IPV6_ADDR_MAPPED) {
274 v4addr = addr->sin6_addr.s6_addr32[3];
275 if (inet_addr_type(net, v4addr) != RTN_LOCAL) {
276 err = -EADDRNOTAVAIL;
277 goto out;
278 }
279 } else {
280 if (addr_type != IPV6_ADDR_ANY) {
281 struct net_device *dev = NULL;
282
283 if (addr_type & IPV6_ADDR_LINKLOCAL) {
284 if (addr_len >= sizeof(struct sockaddr_in6) &&
285 addr->sin6_scope_id) {
286 /* Override any existing binding, if another one
287 * is supplied by user.
288 */
289 sk->sk_bound_dev_if = addr->sin6_scope_id;
290 }
291
292 /* Binding to link-local address requires an interface */
293 if (!sk->sk_bound_dev_if) {
294 err = -EINVAL;
295 goto out;
296 }
297 dev = dev_get_by_index(net, sk->sk_bound_dev_if);
298 if (!dev) {
299 err = -ENODEV;
300 goto out;
301 }
302 }
303
304 /* ipv4 addr of the socket is invalid. Only the
305 * unspecified and mapped address have a v4 equivalent.
306 */
307 v4addr = LOOPBACK4_IPV6;
308 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
309 if (!ipv6_chk_addr(net, &addr->sin6_addr,
310 dev, 0)) {
311 if (dev)
312 dev_put(dev);
313 err = -EADDRNOTAVAIL;
314 goto out;
315 }
316 }
317 if (dev)
318 dev_put(dev);
319 }
320 }
321
322 inet->rcv_saddr = v4addr;
323 inet->saddr = v4addr;
324
325 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
326
327 if (!(addr_type & IPV6_ADDR_MULTICAST))
328 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
329
330 /* Make sure we are allowed to bind here. */
331 if (sk->sk_prot->get_port(sk, snum)) {
332 inet_reset_saddr(sk);
333 err = -EADDRINUSE;
334 goto out;
335 }
336
337 if (addr_type != IPV6_ADDR_ANY)
338 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
339 if (snum)
340 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
341 inet->sport = htons(inet->num);
342 inet->dport = 0;
343 inet->daddr = 0;
344 out:
345 release_sock(sk);
346 return err;
347 }
348
349 EXPORT_SYMBOL(inet6_bind);
350
351 int inet6_release(struct socket *sock)
352 {
353 struct sock *sk = sock->sk;
354
355 if (sk == NULL)
356 return -EINVAL;
357
358 /* Free mc lists */
359 ipv6_sock_mc_close(sk);
360
361 /* Free ac lists */
362 ipv6_sock_ac_close(sk);
363
364 return inet_release(sock);
365 }
366
367 EXPORT_SYMBOL(inet6_release);
368
369 void inet6_destroy_sock(struct sock *sk)
370 {
371 struct ipv6_pinfo *np = inet6_sk(sk);
372 struct sk_buff *skb;
373 struct ipv6_txoptions *opt;
374
375 /* Release rx options */
376
377 if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
378 kfree_skb(skb);
379
380 /* Free flowlabels */
381 fl6_free_socklist(sk);
382
383 /* Free tx options */
384
385 if ((opt = xchg(&np->opt, NULL)) != NULL)
386 sock_kfree_s(sk, opt, opt->tot_len);
387 }
388
389 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
390
391 /*
392 * This does both peername and sockname.
393 */
394
395 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
396 int *uaddr_len, int peer)
397 {
398 struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
399 struct sock *sk = sock->sk;
400 struct inet_sock *inet = inet_sk(sk);
401 struct ipv6_pinfo *np = inet6_sk(sk);
402
403 sin->sin6_family = AF_INET6;
404 sin->sin6_flowinfo = 0;
405 sin->sin6_scope_id = 0;
406 if (peer) {
407 if (!inet->dport)
408 return -ENOTCONN;
409 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
410 peer == 1)
411 return -ENOTCONN;
412 sin->sin6_port = inet->dport;
413 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
414 if (np->sndflow)
415 sin->sin6_flowinfo = np->flow_label;
416 } else {
417 if (ipv6_addr_any(&np->rcv_saddr))
418 ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
419 else
420 ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
421
422 sin->sin6_port = inet->sport;
423 }
424 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
425 sin->sin6_scope_id = sk->sk_bound_dev_if;
426 *uaddr_len = sizeof(*sin);
427 return(0);
428 }
429
430 EXPORT_SYMBOL(inet6_getname);
431
432 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
433 {
434 struct sock *sk = sock->sk;
435 struct net *net = sock_net(sk);
436
437 switch(cmd)
438 {
439 case SIOCGSTAMP:
440 return sock_get_timestamp(sk, (struct timeval __user *)arg);
441
442 case SIOCGSTAMPNS:
443 return sock_get_timestampns(sk, (struct timespec __user *)arg);
444
445 case SIOCADDRT:
446 case SIOCDELRT:
447
448 return(ipv6_route_ioctl(net, cmd, (void __user *)arg));
449
450 case SIOCSIFADDR:
451 return addrconf_add_ifaddr(net, (void __user *) arg);
452 case SIOCDIFADDR:
453 return addrconf_del_ifaddr(net, (void __user *) arg);
454 case SIOCSIFDSTADDR:
455 return addrconf_set_dstaddr(net, (void __user *) arg);
456 default:
457 if (!sk->sk_prot->ioctl)
458 return -ENOIOCTLCMD;
459 return sk->sk_prot->ioctl(sk, cmd, arg);
460 }
461 /*NOTREACHED*/
462 return(0);
463 }
464
465 EXPORT_SYMBOL(inet6_ioctl);
466
467 const struct proto_ops inet6_stream_ops = {
468 .family = PF_INET6,
469 .owner = THIS_MODULE,
470 .release = inet6_release,
471 .bind = inet6_bind,
472 .connect = inet_stream_connect, /* ok */
473 .socketpair = sock_no_socketpair, /* a do nothing */
474 .accept = inet_accept, /* ok */
475 .getname = inet6_getname,
476 .poll = tcp_poll, /* ok */
477 .ioctl = inet6_ioctl, /* must change */
478 .listen = inet_listen, /* ok */
479 .shutdown = inet_shutdown, /* ok */
480 .setsockopt = sock_common_setsockopt, /* ok */
481 .getsockopt = sock_common_getsockopt, /* ok */
482 .sendmsg = tcp_sendmsg, /* ok */
483 .recvmsg = sock_common_recvmsg, /* ok */
484 .mmap = sock_no_mmap,
485 .sendpage = tcp_sendpage,
486 .splice_read = tcp_splice_read,
487 #ifdef CONFIG_COMPAT
488 .compat_setsockopt = compat_sock_common_setsockopt,
489 .compat_getsockopt = compat_sock_common_getsockopt,
490 #endif
491 };
492
493 const struct proto_ops inet6_dgram_ops = {
494 .family = PF_INET6,
495 .owner = THIS_MODULE,
496 .release = inet6_release,
497 .bind = inet6_bind,
498 .connect = inet_dgram_connect, /* ok */
499 .socketpair = sock_no_socketpair, /* a do nothing */
500 .accept = sock_no_accept, /* a do nothing */
501 .getname = inet6_getname,
502 .poll = udp_poll, /* ok */
503 .ioctl = inet6_ioctl, /* must change */
504 .listen = sock_no_listen, /* ok */
505 .shutdown = inet_shutdown, /* ok */
506 .setsockopt = sock_common_setsockopt, /* ok */
507 .getsockopt = sock_common_getsockopt, /* ok */
508 .sendmsg = inet_sendmsg, /* ok */
509 .recvmsg = sock_common_recvmsg, /* ok */
510 .mmap = sock_no_mmap,
511 .sendpage = sock_no_sendpage,
512 #ifdef CONFIG_COMPAT
513 .compat_setsockopt = compat_sock_common_setsockopt,
514 .compat_getsockopt = compat_sock_common_getsockopt,
515 #endif
516 };
517
518 static struct net_proto_family inet6_family_ops = {
519 .family = PF_INET6,
520 .create = inet6_create,
521 .owner = THIS_MODULE,
522 };
523
524 int inet6_register_protosw(struct inet_protosw *p)
525 {
526 struct list_head *lh;
527 struct inet_protosw *answer;
528 struct list_head *last_perm;
529 int protocol = p->protocol;
530 int ret;
531
532 spin_lock_bh(&inetsw6_lock);
533
534 ret = -EINVAL;
535 if (p->type >= SOCK_MAX)
536 goto out_illegal;
537
538 /* If we are trying to override a permanent protocol, bail. */
539 answer = NULL;
540 ret = -EPERM;
541 last_perm = &inetsw6[p->type];
542 list_for_each(lh, &inetsw6[p->type]) {
543 answer = list_entry(lh, struct inet_protosw, list);
544
545 /* Check only the non-wild match. */
546 if (INET_PROTOSW_PERMANENT & answer->flags) {
547 if (protocol == answer->protocol)
548 break;
549 last_perm = lh;
550 }
551
552 answer = NULL;
553 }
554 if (answer)
555 goto out_permanent;
556
557 /* Add the new entry after the last permanent entry if any, so that
558 * the new entry does not override a permanent entry when matched with
559 * a wild-card protocol. But it is allowed to override any existing
560 * non-permanent entry. This means that when we remove this entry, the
561 * system automatically returns to the old behavior.
562 */
563 list_add_rcu(&p->list, last_perm);
564 ret = 0;
565 out:
566 spin_unlock_bh(&inetsw6_lock);
567 return ret;
568
569 out_permanent:
570 printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
571 protocol);
572 goto out;
573
574 out_illegal:
575 printk(KERN_ERR
576 "Ignoring attempt to register invalid socket type %d.\n",
577 p->type);
578 goto out;
579 }
580
581 EXPORT_SYMBOL(inet6_register_protosw);
582
583 void
584 inet6_unregister_protosw(struct inet_protosw *p)
585 {
586 if (INET_PROTOSW_PERMANENT & p->flags) {
587 printk(KERN_ERR
588 "Attempt to unregister permanent protocol %d.\n",
589 p->protocol);
590 } else {
591 spin_lock_bh(&inetsw6_lock);
592 list_del_rcu(&p->list);
593 spin_unlock_bh(&inetsw6_lock);
594
595 synchronize_net();
596 }
597 }
598
599 EXPORT_SYMBOL(inet6_unregister_protosw);
600
601 int inet6_sk_rebuild_header(struct sock *sk)
602 {
603 int err;
604 struct dst_entry *dst;
605 struct ipv6_pinfo *np = inet6_sk(sk);
606
607 dst = __sk_dst_check(sk, np->dst_cookie);
608
609 if (dst == NULL) {
610 struct inet_sock *inet = inet_sk(sk);
611 struct in6_addr *final_p = NULL, final;
612 struct flowi fl;
613
614 memset(&fl, 0, sizeof(fl));
615 fl.proto = sk->sk_protocol;
616 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
617 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
618 fl.fl6_flowlabel = np->flow_label;
619 fl.oif = sk->sk_bound_dev_if;
620 fl.fl_ip_dport = inet->dport;
621 fl.fl_ip_sport = inet->sport;
622 security_sk_classify_flow(sk, &fl);
623
624 if (np->opt && np->opt->srcrt) {
625 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
626 ipv6_addr_copy(&final, &fl.fl6_dst);
627 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
628 final_p = &final;
629 }
630
631 err = ip6_dst_lookup(sk, &dst, &fl);
632 if (err) {
633 sk->sk_route_caps = 0;
634 return err;
635 }
636 if (final_p)
637 ipv6_addr_copy(&fl.fl6_dst, final_p);
638
639 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
640 sk->sk_err_soft = -err;
641 return err;
642 }
643
644 __ip6_dst_store(sk, dst, NULL, NULL);
645 }
646
647 return 0;
648 }
649
650 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
651
652 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
653 {
654 struct ipv6_pinfo *np = inet6_sk(sk);
655 struct inet6_skb_parm *opt = IP6CB(skb);
656
657 if (np->rxopt.all) {
658 if ((opt->hop && (np->rxopt.bits.hopopts ||
659 np->rxopt.bits.ohopopts)) ||
660 ((IPV6_FLOWINFO_MASK &
661 *(__be32 *)skb_network_header(skb)) &&
662 np->rxopt.bits.rxflow) ||
663 (opt->srcrt && (np->rxopt.bits.srcrt ||
664 np->rxopt.bits.osrcrt)) ||
665 ((opt->dst1 || opt->dst0) &&
666 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
667 return 1;
668 }
669 return 0;
670 }
671
672 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
673
674 static struct inet6_protocol *ipv6_gso_pull_exthdrs(struct sk_buff *skb,
675 int proto)
676 {
677 struct inet6_protocol *ops = NULL;
678
679 for (;;) {
680 struct ipv6_opt_hdr *opth;
681 int len;
682
683 if (proto != NEXTHDR_HOP) {
684 ops = rcu_dereference(inet6_protos[proto]);
685
686 if (unlikely(!ops))
687 break;
688
689 if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
690 break;
691 }
692
693 if (unlikely(!pskb_may_pull(skb, 8)))
694 break;
695
696 opth = (void *)skb->data;
697 len = ipv6_optlen(opth);
698
699 if (unlikely(!pskb_may_pull(skb, len)))
700 break;
701
702 proto = opth->nexthdr;
703 __skb_pull(skb, len);
704 }
705
706 return ops;
707 }
708
709 static int ipv6_gso_send_check(struct sk_buff *skb)
710 {
711 struct ipv6hdr *ipv6h;
712 struct inet6_protocol *ops;
713 int err = -EINVAL;
714
715 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
716 goto out;
717
718 ipv6h = ipv6_hdr(skb);
719 __skb_pull(skb, sizeof(*ipv6h));
720 err = -EPROTONOSUPPORT;
721
722 rcu_read_lock();
723 ops = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
724 if (likely(ops && ops->gso_send_check)) {
725 skb_reset_transport_header(skb);
726 err = ops->gso_send_check(skb);
727 }
728 rcu_read_unlock();
729
730 out:
731 return err;
732 }
733
734 static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features)
735 {
736 struct sk_buff *segs = ERR_PTR(-EINVAL);
737 struct ipv6hdr *ipv6h;
738 struct inet6_protocol *ops;
739
740 if (!(features & NETIF_F_V6_CSUM))
741 features &= ~NETIF_F_SG;
742
743 if (unlikely(skb_shinfo(skb)->gso_type &
744 ~(SKB_GSO_UDP |
745 SKB_GSO_DODGY |
746 SKB_GSO_TCP_ECN |
747 SKB_GSO_TCPV6 |
748 0)))
749 goto out;
750
751 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
752 goto out;
753
754 ipv6h = ipv6_hdr(skb);
755 __skb_pull(skb, sizeof(*ipv6h));
756 segs = ERR_PTR(-EPROTONOSUPPORT);
757
758 rcu_read_lock();
759 ops = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
760 if (likely(ops && ops->gso_segment)) {
761 skb_reset_transport_header(skb);
762 segs = ops->gso_segment(skb, features);
763 }
764 rcu_read_unlock();
765
766 if (unlikely(IS_ERR(segs)))
767 goto out;
768
769 for (skb = segs; skb; skb = skb->next) {
770 ipv6h = ipv6_hdr(skb);
771 ipv6h->payload_len = htons(skb->len - skb->mac_len -
772 sizeof(*ipv6h));
773 }
774
775 out:
776 return segs;
777 }
778
779 static struct packet_type ipv6_packet_type = {
780 .type = __constant_htons(ETH_P_IPV6),
781 .func = ipv6_rcv,
782 .gso_send_check = ipv6_gso_send_check,
783 .gso_segment = ipv6_gso_segment,
784 };
785
786 static int __init ipv6_packet_init(void)
787 {
788 dev_add_pack(&ipv6_packet_type);
789 return 0;
790 }
791
792 static void ipv6_packet_cleanup(void)
793 {
794 dev_remove_pack(&ipv6_packet_type);
795 }
796
797 static int __init init_ipv6_mibs(void)
798 {
799 if (snmp_mib_init((void **)ipv6_statistics,
800 sizeof(struct ipstats_mib)) < 0)
801 goto err_ip_mib;
802 if (snmp_mib_init((void **)icmpv6_statistics,
803 sizeof(struct icmpv6_mib)) < 0)
804 goto err_icmp_mib;
805 if (snmp_mib_init((void **)icmpv6msg_statistics,
806 sizeof(struct icmpv6msg_mib)) < 0)
807 goto err_icmpmsg_mib;
808 if (snmp_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib)) < 0)
809 goto err_udp_mib;
810 if (snmp_mib_init((void **)udplite_stats_in6,
811 sizeof (struct udp_mib)) < 0)
812 goto err_udplite_mib;
813 return 0;
814
815 err_udplite_mib:
816 snmp_mib_free((void **)udp_stats_in6);
817 err_udp_mib:
818 snmp_mib_free((void **)icmpv6msg_statistics);
819 err_icmpmsg_mib:
820 snmp_mib_free((void **)icmpv6_statistics);
821 err_icmp_mib:
822 snmp_mib_free((void **)ipv6_statistics);
823 err_ip_mib:
824 return -ENOMEM;
825
826 }
827
828 static void cleanup_ipv6_mibs(void)
829 {
830 snmp_mib_free((void **)ipv6_statistics);
831 snmp_mib_free((void **)icmpv6_statistics);
832 snmp_mib_free((void **)icmpv6msg_statistics);
833 snmp_mib_free((void **)udp_stats_in6);
834 snmp_mib_free((void **)udplite_stats_in6);
835 }
836
837 static int inet6_net_init(struct net *net)
838 {
839 int err = 0;
840
841 net->ipv6.sysctl.bindv6only = 0;
842 net->ipv6.sysctl.flush_delay = 0;
843 net->ipv6.sysctl.ip6_rt_max_size = 4096;
844 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
845 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
846 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
847 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
848 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
849 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
850 net->ipv6.sysctl.icmpv6_time = 1*HZ;
851
852 #ifdef CONFIG_PROC_FS
853 err = udp6_proc_init(net);
854 if (err)
855 goto out;
856 err = tcp6_proc_init(net);
857 if (err)
858 goto proc_tcp6_fail;
859 err = ac6_proc_init(net);
860 if (err)
861 goto proc_ac6_fail;
862 out:
863 #endif
864 return err;
865
866 #ifdef CONFIG_PROC_FS
867 proc_ac6_fail:
868 tcp6_proc_exit(net);
869 proc_tcp6_fail:
870 udp6_proc_exit(net);
871 goto out;
872 #endif
873 }
874
875 static void inet6_net_exit(struct net *net)
876 {
877 #ifdef CONFIG_PROC_FS
878 udp6_proc_exit(net);
879 tcp6_proc_exit(net);
880 ac6_proc_exit(net);
881 #endif
882 }
883
884 static struct pernet_operations inet6_net_ops = {
885 .init = inet6_net_init,
886 .exit = inet6_net_exit,
887 };
888
889 static int __init inet6_init(void)
890 {
891 struct sk_buff *dummy_skb;
892 struct list_head *r;
893 int err;
894
895 BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
896
897 err = proto_register(&tcpv6_prot, 1);
898 if (err)
899 goto out;
900
901 err = proto_register(&udpv6_prot, 1);
902 if (err)
903 goto out_unregister_tcp_proto;
904
905 err = proto_register(&udplitev6_prot, 1);
906 if (err)
907 goto out_unregister_udp_proto;
908
909 err = proto_register(&rawv6_prot, 1);
910 if (err)
911 goto out_unregister_udplite_proto;
912
913
914 /* Register the socket-side information for inet6_create. */
915 for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
916 INIT_LIST_HEAD(r);
917
918 /* We MUST register RAW sockets before we create the ICMP6,
919 * IGMP6, or NDISC control sockets.
920 */
921 err = rawv6_init();
922 if (err)
923 goto out_unregister_raw_proto;
924
925 /* Register the family here so that the init calls below will
926 * be able to create sockets. (?? is this dangerous ??)
927 */
928 err = sock_register(&inet6_family_ops);
929 if (err)
930 goto out_sock_register_fail;
931
932 /* Initialise ipv6 mibs */
933 err = init_ipv6_mibs();
934 if (err)
935 goto out_unregister_sock;
936
937 /*
938 * ipngwg API draft makes clear that the correct semantics
939 * for TCP and UDP is to consider one TCP and UDP instance
940 * in a host availiable by both INET and INET6 APIs and
941 * able to communicate via both network protocols.
942 */
943
944 err = register_pernet_subsys(&inet6_net_ops);
945 if (err)
946 goto register_pernet_fail;
947 err = icmpv6_init();
948 if (err)
949 goto icmp_fail;
950 err = ip6_mr_init();
951 if (err)
952 goto ipmr_fail;
953 err = ndisc_init();
954 if (err)
955 goto ndisc_fail;
956 err = igmp6_init();
957 if (err)
958 goto igmp_fail;
959 err = ipv6_netfilter_init();
960 if (err)
961 goto netfilter_fail;
962 /* Create /proc/foo6 entries. */
963 #ifdef CONFIG_PROC_FS
964 err = -ENOMEM;
965 if (raw6_proc_init())
966 goto proc_raw6_fail;
967 if (udplite6_proc_init())
968 goto proc_udplite6_fail;
969 if (ipv6_misc_proc_init())
970 goto proc_misc6_fail;
971 if (if6_proc_init())
972 goto proc_if6_fail;
973 #endif
974 err = ip6_route_init();
975 if (err)
976 goto ip6_route_fail;
977 err = ip6_flowlabel_init();
978 if (err)
979 goto ip6_flowlabel_fail;
980 err = addrconf_init();
981 if (err)
982 goto addrconf_fail;
983
984 /* Init v6 extension headers. */
985 err = ipv6_exthdrs_init();
986 if (err)
987 goto ipv6_exthdrs_fail;
988
989 err = ipv6_frag_init();
990 if (err)
991 goto ipv6_frag_fail;
992
993 /* Init v6 transport protocols. */
994 err = udpv6_init();
995 if (err)
996 goto udpv6_fail;
997
998 err = udplitev6_init();
999 if (err)
1000 goto udplitev6_fail;
1001
1002 err = tcpv6_init();
1003 if (err)
1004 goto tcpv6_fail;
1005
1006 err = ipv6_packet_init();
1007 if (err)
1008 goto ipv6_packet_fail;
1009
1010 #ifdef CONFIG_SYSCTL
1011 err = ipv6_sysctl_register();
1012 if (err)
1013 goto sysctl_fail;
1014 #endif
1015 out:
1016 return err;
1017
1018 #ifdef CONFIG_SYSCTL
1019 sysctl_fail:
1020 ipv6_packet_cleanup();
1021 #endif
1022 ipv6_packet_fail:
1023 tcpv6_exit();
1024 tcpv6_fail:
1025 udplitev6_exit();
1026 udplitev6_fail:
1027 udpv6_exit();
1028 udpv6_fail:
1029 ipv6_frag_exit();
1030 ipv6_frag_fail:
1031 ipv6_exthdrs_exit();
1032 ipv6_exthdrs_fail:
1033 addrconf_cleanup();
1034 addrconf_fail:
1035 ip6_flowlabel_cleanup();
1036 ip6_flowlabel_fail:
1037 ip6_route_cleanup();
1038 ip6_route_fail:
1039 #ifdef CONFIG_PROC_FS
1040 if6_proc_exit();
1041 proc_if6_fail:
1042 ipv6_misc_proc_exit();
1043 proc_misc6_fail:
1044 udplite6_proc_exit();
1045 proc_udplite6_fail:
1046 raw6_proc_exit();
1047 proc_raw6_fail:
1048 #endif
1049 ipv6_netfilter_fini();
1050 netfilter_fail:
1051 igmp6_cleanup();
1052 igmp_fail:
1053 ndisc_cleanup();
1054 ndisc_fail:
1055 ip6_mr_cleanup();
1056 ipmr_fail:
1057 icmpv6_cleanup();
1058 icmp_fail:
1059 unregister_pernet_subsys(&inet6_net_ops);
1060 register_pernet_fail:
1061 cleanup_ipv6_mibs();
1062 out_unregister_sock:
1063 sock_unregister(PF_INET6);
1064 rtnl_unregister_all(PF_INET6);
1065 out_sock_register_fail:
1066 rawv6_exit();
1067 out_unregister_raw_proto:
1068 proto_unregister(&rawv6_prot);
1069 out_unregister_udplite_proto:
1070 proto_unregister(&udplitev6_prot);
1071 out_unregister_udp_proto:
1072 proto_unregister(&udpv6_prot);
1073 out_unregister_tcp_proto:
1074 proto_unregister(&tcpv6_prot);
1075 goto out;
1076 }
1077 module_init(inet6_init);
1078
1079 static void __exit inet6_exit(void)
1080 {
1081 /* First of all disallow new sockets creation. */
1082 sock_unregister(PF_INET6);
1083 /* Disallow any further netlink messages */
1084 rtnl_unregister_all(PF_INET6);
1085
1086 #ifdef CONFIG_SYSCTL
1087 ipv6_sysctl_unregister();
1088 #endif
1089 udpv6_exit();
1090 udplitev6_exit();
1091 tcpv6_exit();
1092
1093 /* Cleanup code parts. */
1094 ipv6_packet_cleanup();
1095 ipv6_frag_exit();
1096 ipv6_exthdrs_exit();
1097 addrconf_cleanup();
1098 ip6_flowlabel_cleanup();
1099 ip6_route_cleanup();
1100 #ifdef CONFIG_PROC_FS
1101
1102 /* Cleanup code parts. */
1103 if6_proc_exit();
1104 ipv6_misc_proc_exit();
1105 udplite6_proc_exit();
1106 raw6_proc_exit();
1107 #endif
1108 ipv6_netfilter_fini();
1109 igmp6_cleanup();
1110 ndisc_cleanup();
1111 ip6_mr_cleanup();
1112 icmpv6_cleanup();
1113 rawv6_exit();
1114
1115 unregister_pernet_subsys(&inet6_net_ops);
1116 cleanup_ipv6_mibs();
1117 proto_unregister(&rawv6_prot);
1118 proto_unregister(&udplitev6_prot);
1119 proto_unregister(&udpv6_prot);
1120 proto_unregister(&tcpv6_prot);
1121 }
1122 module_exit(inet6_exit);
1123
1124 MODULE_ALIAS_NETPROTO(PF_INET6);
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