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730a861b8f41e9024fc144280b5b34efe65ce4eb
[deliverable/linux.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 * $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
65 MODULE_AUTHOR("Cast of dozens");
66 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
67 MODULE_LICENSE("GPL");
68
69 /* The inetsw6 table contains everything that inet6_create needs to
70 * build a new socket.
71 */
72 static struct list_head inetsw6[SOCK_MAX];
73 static DEFINE_SPINLOCK(inetsw6_lock);
74
75 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
76 {
77 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
78
79 return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
80 }
81
82 static int inet6_create(struct net *net, struct socket *sock, int protocol)
83 {
84 struct inet_sock *inet;
85 struct ipv6_pinfo *np;
86 struct sock *sk;
87 struct list_head *p;
88 struct inet_protosw *answer;
89 struct proto *answer_prot;
90 unsigned char answer_flags;
91 char answer_no_check;
92 int try_loading_module = 0;
93 int err;
94
95 if (sock->type != SOCK_RAW &&
96 sock->type != SOCK_DGRAM &&
97 !inet_ehash_secret)
98 build_ehash_secret();
99
100 /* Look for the requested type/protocol pair. */
101 answer = NULL;
102 lookup_protocol:
103 err = -ESOCKTNOSUPPORT;
104 rcu_read_lock();
105 list_for_each_rcu(p, &inetsw6[sock->type]) {
106 answer = list_entry(p, struct inet_protosw, list);
107
108 /* Check the non-wild match. */
109 if (protocol == answer->protocol) {
110 if (protocol != IPPROTO_IP)
111 break;
112 } else {
113 /* Check for the two wild cases. */
114 if (IPPROTO_IP == protocol) {
115 protocol = answer->protocol;
116 break;
117 }
118 if (IPPROTO_IP == answer->protocol)
119 break;
120 }
121 err = -EPROTONOSUPPORT;
122 answer = NULL;
123 }
124
125 if (!answer) {
126 if (try_loading_module < 2) {
127 rcu_read_unlock();
128 /*
129 * Be more specific, e.g. net-pf-10-proto-132-type-1
130 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
131 */
132 if (++try_loading_module == 1)
133 request_module("net-pf-%d-proto-%d-type-%d",
134 PF_INET6, protocol, sock->type);
135 /*
136 * Fall back to generic, e.g. net-pf-10-proto-132
137 * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
138 */
139 else
140 request_module("net-pf-%d-proto-%d",
141 PF_INET6, protocol);
142 goto lookup_protocol;
143 } else
144 goto out_rcu_unlock;
145 }
146
147 err = -EPERM;
148 if (answer->capability > 0 && !capable(answer->capability))
149 goto out_rcu_unlock;
150
151 sock->ops = answer->ops;
152 answer_prot = answer->prot;
153 answer_no_check = answer->no_check;
154 answer_flags = answer->flags;
155 rcu_read_unlock();
156
157 BUG_TRAP(answer_prot->slab != NULL);
158
159 err = -ENOBUFS;
160 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot);
161 if (sk == NULL)
162 goto out;
163
164 sock_init_data(sock, sk);
165
166 err = 0;
167 sk->sk_no_check = answer_no_check;
168 if (INET_PROTOSW_REUSE & answer_flags)
169 sk->sk_reuse = 1;
170
171 inet = inet_sk(sk);
172 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
173
174 if (SOCK_RAW == sock->type) {
175 inet->num = protocol;
176 if (IPPROTO_RAW == protocol)
177 inet->hdrincl = 1;
178 }
179
180 sk->sk_destruct = inet_sock_destruct;
181 sk->sk_family = PF_INET6;
182 sk->sk_protocol = protocol;
183
184 sk->sk_backlog_rcv = answer->prot->backlog_rcv;
185
186 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
187 np->hop_limit = -1;
188 np->mcast_hops = -1;
189 np->mc_loop = 1;
190 np->pmtudisc = IPV6_PMTUDISC_WANT;
191 np->ipv6only = init_net.ipv6.sysctl.bindv6only;
192
193 /* Init the ipv4 part of the socket since we can have sockets
194 * using v6 API for ipv4.
195 */
196 inet->uc_ttl = -1;
197
198 inet->mc_loop = 1;
199 inet->mc_ttl = 1;
200 inet->mc_index = 0;
201 inet->mc_list = NULL;
202
203 if (ipv4_config.no_pmtu_disc)
204 inet->pmtudisc = IP_PMTUDISC_DONT;
205 else
206 inet->pmtudisc = IP_PMTUDISC_WANT;
207 /*
208 * Increment only the relevant sk_prot->socks debug field, this changes
209 * the previous behaviour of incrementing both the equivalent to
210 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
211 *
212 * This allows better debug granularity as we'll know exactly how many
213 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
214 * transport protocol socks. -acme
215 */
216 sk_refcnt_debug_inc(sk);
217
218 if (inet->num) {
219 /* It assumes that any protocol which allows
220 * the user to assign a number at socket
221 * creation time automatically shares.
222 */
223 inet->sport = htons(inet->num);
224 sk->sk_prot->hash(sk);
225 }
226 if (sk->sk_prot->init) {
227 err = sk->sk_prot->init(sk);
228 if (err) {
229 sk_common_release(sk);
230 goto out;
231 }
232 }
233 out:
234 return err;
235 out_rcu_unlock:
236 rcu_read_unlock();
237 goto out;
238 }
239
240
241 /* bind for INET6 API */
242 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
243 {
244 struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
245 struct sock *sk = sock->sk;
246 struct inet_sock *inet = inet_sk(sk);
247 struct ipv6_pinfo *np = inet6_sk(sk);
248 struct net *net = sk->sk_net;
249 __be32 v4addr = 0;
250 unsigned short snum;
251 int addr_type = 0;
252 int err = 0;
253
254 /* If the socket has its own bind function then use it. */
255 if (sk->sk_prot->bind)
256 return sk->sk_prot->bind(sk, uaddr, addr_len);
257
258 if (addr_len < SIN6_LEN_RFC2133)
259 return -EINVAL;
260 addr_type = ipv6_addr_type(&addr->sin6_addr);
261 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
262 return -EINVAL;
263
264 snum = ntohs(addr->sin6_port);
265 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
266 return -EACCES;
267
268 lock_sock(sk);
269
270 /* Check these errors (active socket, double bind). */
271 if (sk->sk_state != TCP_CLOSE || inet->num) {
272 err = -EINVAL;
273 goto out;
274 }
275
276 /* Check if the address belongs to the host. */
277 if (addr_type == IPV6_ADDR_MAPPED) {
278 v4addr = addr->sin6_addr.s6_addr32[3];
279 if (inet_addr_type(net, v4addr) != RTN_LOCAL) {
280 err = -EADDRNOTAVAIL;
281 goto out;
282 }
283 } else {
284 if (addr_type != IPV6_ADDR_ANY) {
285 struct net_device *dev = NULL;
286
287 if (addr_type & IPV6_ADDR_LINKLOCAL) {
288 if (addr_len >= sizeof(struct sockaddr_in6) &&
289 addr->sin6_scope_id) {
290 /* Override any existing binding, if another one
291 * is supplied by user.
292 */
293 sk->sk_bound_dev_if = addr->sin6_scope_id;
294 }
295
296 /* Binding to link-local address requires an interface */
297 if (!sk->sk_bound_dev_if) {
298 err = -EINVAL;
299 goto out;
300 }
301 dev = dev_get_by_index(net, sk->sk_bound_dev_if);
302 if (!dev) {
303 err = -ENODEV;
304 goto out;
305 }
306 }
307
308 /* ipv4 addr of the socket is invalid. Only the
309 * unspecified and mapped address have a v4 equivalent.
310 */
311 v4addr = LOOPBACK4_IPV6;
312 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
313 if (!ipv6_chk_addr(net, &addr->sin6_addr,
314 dev, 0)) {
315 if (dev)
316 dev_put(dev);
317 err = -EADDRNOTAVAIL;
318 goto out;
319 }
320 }
321 if (dev)
322 dev_put(dev);
323 }
324 }
325
326 inet->rcv_saddr = v4addr;
327 inet->saddr = v4addr;
328
329 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
330
331 if (!(addr_type & IPV6_ADDR_MULTICAST))
332 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
333
334 /* Make sure we are allowed to bind here. */
335 if (sk->sk_prot->get_port(sk, snum)) {
336 inet_reset_saddr(sk);
337 err = -EADDRINUSE;
338 goto out;
339 }
340
341 if (addr_type != IPV6_ADDR_ANY)
342 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
343 if (snum)
344 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
345 inet->sport = htons(inet->num);
346 inet->dport = 0;
347 inet->daddr = 0;
348 out:
349 release_sock(sk);
350 return err;
351 }
352
353 EXPORT_SYMBOL(inet6_bind);
354
355 int inet6_release(struct socket *sock)
356 {
357 struct sock *sk = sock->sk;
358
359 if (sk == NULL)
360 return -EINVAL;
361
362 /* Free mc lists */
363 ipv6_sock_mc_close(sk);
364
365 /* Free ac lists */
366 ipv6_sock_ac_close(sk);
367
368 return inet_release(sock);
369 }
370
371 EXPORT_SYMBOL(inet6_release);
372
373 int inet6_destroy_sock(struct sock *sk)
374 {
375 struct ipv6_pinfo *np = inet6_sk(sk);
376 struct sk_buff *skb;
377 struct ipv6_txoptions *opt;
378
379 /* Release rx options */
380
381 if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
382 kfree_skb(skb);
383
384 /* Free flowlabels */
385 fl6_free_socklist(sk);
386
387 /* Free tx options */
388
389 if ((opt = xchg(&np->opt, NULL)) != NULL)
390 sock_kfree_s(sk, opt, opt->tot_len);
391
392 return 0;
393 }
394
395 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
396
397 /*
398 * This does both peername and sockname.
399 */
400
401 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
402 int *uaddr_len, int peer)
403 {
404 struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
405 struct sock *sk = sock->sk;
406 struct inet_sock *inet = inet_sk(sk);
407 struct ipv6_pinfo *np = inet6_sk(sk);
408
409 sin->sin6_family = AF_INET6;
410 sin->sin6_flowinfo = 0;
411 sin->sin6_scope_id = 0;
412 if (peer) {
413 if (!inet->dport)
414 return -ENOTCONN;
415 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
416 peer == 1)
417 return -ENOTCONN;
418 sin->sin6_port = inet->dport;
419 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
420 if (np->sndflow)
421 sin->sin6_flowinfo = np->flow_label;
422 } else {
423 if (ipv6_addr_any(&np->rcv_saddr))
424 ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
425 else
426 ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
427
428 sin->sin6_port = inet->sport;
429 }
430 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
431 sin->sin6_scope_id = sk->sk_bound_dev_if;
432 *uaddr_len = sizeof(*sin);
433 return(0);
434 }
435
436 EXPORT_SYMBOL(inet6_getname);
437
438 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
439 {
440 struct sock *sk = sock->sk;
441 struct net *net = sk->sk_net;
442
443 switch(cmd)
444 {
445 case SIOCGSTAMP:
446 return sock_get_timestamp(sk, (struct timeval __user *)arg);
447
448 case SIOCGSTAMPNS:
449 return sock_get_timestampns(sk, (struct timespec __user *)arg);
450
451 case SIOCADDRT:
452 case SIOCDELRT:
453
454 return(ipv6_route_ioctl(net, cmd, (void __user *)arg));
455
456 case SIOCSIFADDR:
457 return addrconf_add_ifaddr(net, (void __user *) arg);
458 case SIOCDIFADDR:
459 return addrconf_del_ifaddr(net, (void __user *) arg);
460 case SIOCSIFDSTADDR:
461 return addrconf_set_dstaddr(net, (void __user *) arg);
462 default:
463 if (!sk->sk_prot->ioctl)
464 return -ENOIOCTLCMD;
465 return sk->sk_prot->ioctl(sk, cmd, arg);
466 }
467 /*NOTREACHED*/
468 return(0);
469 }
470
471 EXPORT_SYMBOL(inet6_ioctl);
472
473 const struct proto_ops inet6_stream_ops = {
474 .family = PF_INET6,
475 .owner = THIS_MODULE,
476 .release = inet6_release,
477 .bind = inet6_bind,
478 .connect = inet_stream_connect, /* ok */
479 .socketpair = sock_no_socketpair, /* a do nothing */
480 .accept = inet_accept, /* ok */
481 .getname = inet6_getname,
482 .poll = tcp_poll, /* ok */
483 .ioctl = inet6_ioctl, /* must change */
484 .listen = inet_listen, /* ok */
485 .shutdown = inet_shutdown, /* ok */
486 .setsockopt = sock_common_setsockopt, /* ok */
487 .getsockopt = sock_common_getsockopt, /* ok */
488 .sendmsg = tcp_sendmsg, /* ok */
489 .recvmsg = sock_common_recvmsg, /* ok */
490 .mmap = sock_no_mmap,
491 .sendpage = tcp_sendpage,
492 .splice_read = tcp_splice_read,
493 #ifdef CONFIG_COMPAT
494 .compat_setsockopt = compat_sock_common_setsockopt,
495 .compat_getsockopt = compat_sock_common_getsockopt,
496 #endif
497 };
498
499 const struct proto_ops inet6_dgram_ops = {
500 .family = PF_INET6,
501 .owner = THIS_MODULE,
502 .release = inet6_release,
503 .bind = inet6_bind,
504 .connect = inet_dgram_connect, /* ok */
505 .socketpair = sock_no_socketpair, /* a do nothing */
506 .accept = sock_no_accept, /* a do nothing */
507 .getname = inet6_getname,
508 .poll = udp_poll, /* ok */
509 .ioctl = inet6_ioctl, /* must change */
510 .listen = sock_no_listen, /* ok */
511 .shutdown = inet_shutdown, /* ok */
512 .setsockopt = sock_common_setsockopt, /* ok */
513 .getsockopt = sock_common_getsockopt, /* ok */
514 .sendmsg = inet_sendmsg, /* ok */
515 .recvmsg = sock_common_recvmsg, /* ok */
516 .mmap = sock_no_mmap,
517 .sendpage = sock_no_sendpage,
518 #ifdef CONFIG_COMPAT
519 .compat_setsockopt = compat_sock_common_setsockopt,
520 .compat_getsockopt = compat_sock_common_getsockopt,
521 #endif
522 };
523
524 static struct net_proto_family inet6_family_ops = {
525 .family = PF_INET6,
526 .create = inet6_create,
527 .owner = THIS_MODULE,
528 };
529
530 int inet6_register_protosw(struct inet_protosw *p)
531 {
532 struct list_head *lh;
533 struct inet_protosw *answer;
534 struct list_head *last_perm;
535 int protocol = p->protocol;
536 int ret;
537
538 spin_lock_bh(&inetsw6_lock);
539
540 ret = -EINVAL;
541 if (p->type >= SOCK_MAX)
542 goto out_illegal;
543
544 /* If we are trying to override a permanent protocol, bail. */
545 answer = NULL;
546 ret = -EPERM;
547 last_perm = &inetsw6[p->type];
548 list_for_each(lh, &inetsw6[p->type]) {
549 answer = list_entry(lh, struct inet_protosw, list);
550
551 /* Check only the non-wild match. */
552 if (INET_PROTOSW_PERMANENT & answer->flags) {
553 if (protocol == answer->protocol)
554 break;
555 last_perm = lh;
556 }
557
558 answer = NULL;
559 }
560 if (answer)
561 goto out_permanent;
562
563 /* Add the new entry after the last permanent entry if any, so that
564 * the new entry does not override a permanent entry when matched with
565 * a wild-card protocol. But it is allowed to override any existing
566 * non-permanent entry. This means that when we remove this entry, the
567 * system automatically returns to the old behavior.
568 */
569 list_add_rcu(&p->list, last_perm);
570 ret = 0;
571 out:
572 spin_unlock_bh(&inetsw6_lock);
573 return ret;
574
575 out_permanent:
576 printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
577 protocol);
578 goto out;
579
580 out_illegal:
581 printk(KERN_ERR
582 "Ignoring attempt to register invalid socket type %d.\n",
583 p->type);
584 goto out;
585 }
586
587 EXPORT_SYMBOL(inet6_register_protosw);
588
589 void
590 inet6_unregister_protosw(struct inet_protosw *p)
591 {
592 if (INET_PROTOSW_PERMANENT & p->flags) {
593 printk(KERN_ERR
594 "Attempt to unregister permanent protocol %d.\n",
595 p->protocol);
596 } else {
597 spin_lock_bh(&inetsw6_lock);
598 list_del_rcu(&p->list);
599 spin_unlock_bh(&inetsw6_lock);
600
601 synchronize_net();
602 }
603 }
604
605 EXPORT_SYMBOL(inet6_unregister_protosw);
606
607 int inet6_sk_rebuild_header(struct sock *sk)
608 {
609 int err;
610 struct dst_entry *dst;
611 struct ipv6_pinfo *np = inet6_sk(sk);
612
613 dst = __sk_dst_check(sk, np->dst_cookie);
614
615 if (dst == NULL) {
616 struct inet_sock *inet = inet_sk(sk);
617 struct in6_addr *final_p = NULL, final;
618 struct flowi fl;
619
620 memset(&fl, 0, sizeof(fl));
621 fl.proto = sk->sk_protocol;
622 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
623 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
624 fl.fl6_flowlabel = np->flow_label;
625 fl.oif = sk->sk_bound_dev_if;
626 fl.fl_ip_dport = inet->dport;
627 fl.fl_ip_sport = inet->sport;
628 security_sk_classify_flow(sk, &fl);
629
630 if (np->opt && np->opt->srcrt) {
631 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
632 ipv6_addr_copy(&final, &fl.fl6_dst);
633 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
634 final_p = &final;
635 }
636
637 err = ip6_dst_lookup(sk, &dst, &fl);
638 if (err) {
639 sk->sk_route_caps = 0;
640 return err;
641 }
642 if (final_p)
643 ipv6_addr_copy(&fl.fl6_dst, final_p);
644
645 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
646 sk->sk_err_soft = -err;
647 return err;
648 }
649
650 __ip6_dst_store(sk, dst, NULL, NULL);
651 }
652
653 return 0;
654 }
655
656 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
657
658 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
659 {
660 struct ipv6_pinfo *np = inet6_sk(sk);
661 struct inet6_skb_parm *opt = IP6CB(skb);
662
663 if (np->rxopt.all) {
664 if ((opt->hop && (np->rxopt.bits.hopopts ||
665 np->rxopt.bits.ohopopts)) ||
666 ((IPV6_FLOWINFO_MASK &
667 *(__be32 *)skb_network_header(skb)) &&
668 np->rxopt.bits.rxflow) ||
669 (opt->srcrt && (np->rxopt.bits.srcrt ||
670 np->rxopt.bits.osrcrt)) ||
671 ((opt->dst1 || opt->dst0) &&
672 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
673 return 1;
674 }
675 return 0;
676 }
677
678 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
679
680 static struct inet6_protocol *ipv6_gso_pull_exthdrs(struct sk_buff *skb,
681 int proto)
682 {
683 struct inet6_protocol *ops = NULL;
684
685 for (;;) {
686 struct ipv6_opt_hdr *opth;
687 int len;
688
689 if (proto != NEXTHDR_HOP) {
690 ops = rcu_dereference(inet6_protos[proto]);
691
692 if (unlikely(!ops))
693 break;
694
695 if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
696 break;
697 }
698
699 if (unlikely(!pskb_may_pull(skb, 8)))
700 break;
701
702 opth = (void *)skb->data;
703 len = ipv6_optlen(opth);
704
705 if (unlikely(!pskb_may_pull(skb, len)))
706 break;
707
708 proto = opth->nexthdr;
709 __skb_pull(skb, len);
710 }
711
712 return ops;
713 }
714
715 static int ipv6_gso_send_check(struct sk_buff *skb)
716 {
717 struct ipv6hdr *ipv6h;
718 struct inet6_protocol *ops;
719 int err = -EINVAL;
720
721 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
722 goto out;
723
724 ipv6h = ipv6_hdr(skb);
725 __skb_pull(skb, sizeof(*ipv6h));
726 err = -EPROTONOSUPPORT;
727
728 rcu_read_lock();
729 ops = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
730 if (likely(ops && ops->gso_send_check)) {
731 skb_reset_transport_header(skb);
732 err = ops->gso_send_check(skb);
733 }
734 rcu_read_unlock();
735
736 out:
737 return err;
738 }
739
740 static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features)
741 {
742 struct sk_buff *segs = ERR_PTR(-EINVAL);
743 struct ipv6hdr *ipv6h;
744 struct inet6_protocol *ops;
745
746 if (!(features & NETIF_F_V6_CSUM))
747 features &= ~NETIF_F_SG;
748
749 if (unlikely(skb_shinfo(skb)->gso_type &
750 ~(SKB_GSO_UDP |
751 SKB_GSO_DODGY |
752 SKB_GSO_TCP_ECN |
753 SKB_GSO_TCPV6 |
754 0)))
755 goto out;
756
757 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
758 goto out;
759
760 ipv6h = ipv6_hdr(skb);
761 __skb_pull(skb, sizeof(*ipv6h));
762 segs = ERR_PTR(-EPROTONOSUPPORT);
763
764 rcu_read_lock();
765 ops = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
766 if (likely(ops && ops->gso_segment)) {
767 skb_reset_transport_header(skb);
768 segs = ops->gso_segment(skb, features);
769 }
770 rcu_read_unlock();
771
772 if (unlikely(IS_ERR(segs)))
773 goto out;
774
775 for (skb = segs; skb; skb = skb->next) {
776 ipv6h = ipv6_hdr(skb);
777 ipv6h->payload_len = htons(skb->len - skb->mac_len -
778 sizeof(*ipv6h));
779 }
780
781 out:
782 return segs;
783 }
784
785 static struct packet_type ipv6_packet_type = {
786 .type = __constant_htons(ETH_P_IPV6),
787 .func = ipv6_rcv,
788 .gso_send_check = ipv6_gso_send_check,
789 .gso_segment = ipv6_gso_segment,
790 };
791
792 static int __init ipv6_packet_init(void)
793 {
794 dev_add_pack(&ipv6_packet_type);
795 return 0;
796 }
797
798 static void ipv6_packet_cleanup(void)
799 {
800 dev_remove_pack(&ipv6_packet_type);
801 }
802
803 static int __init init_ipv6_mibs(void)
804 {
805 if (snmp_mib_init((void **)ipv6_statistics,
806 sizeof(struct ipstats_mib)) < 0)
807 goto err_ip_mib;
808 if (snmp_mib_init((void **)icmpv6_statistics,
809 sizeof(struct icmpv6_mib)) < 0)
810 goto err_icmp_mib;
811 if (snmp_mib_init((void **)icmpv6msg_statistics,
812 sizeof(struct icmpv6msg_mib)) < 0)
813 goto err_icmpmsg_mib;
814 if (snmp_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib)) < 0)
815 goto err_udp_mib;
816 if (snmp_mib_init((void **)udplite_stats_in6,
817 sizeof (struct udp_mib)) < 0)
818 goto err_udplite_mib;
819 return 0;
820
821 err_udplite_mib:
822 snmp_mib_free((void **)udp_stats_in6);
823 err_udp_mib:
824 snmp_mib_free((void **)icmpv6msg_statistics);
825 err_icmpmsg_mib:
826 snmp_mib_free((void **)icmpv6_statistics);
827 err_icmp_mib:
828 snmp_mib_free((void **)ipv6_statistics);
829 err_ip_mib:
830 return -ENOMEM;
831
832 }
833
834 static void cleanup_ipv6_mibs(void)
835 {
836 snmp_mib_free((void **)ipv6_statistics);
837 snmp_mib_free((void **)icmpv6_statistics);
838 snmp_mib_free((void **)icmpv6msg_statistics);
839 snmp_mib_free((void **)udp_stats_in6);
840 snmp_mib_free((void **)udplite_stats_in6);
841 }
842
843 static int inet6_net_init(struct net *net)
844 {
845 net->ipv6.sysctl.bindv6only = 0;
846 net->ipv6.sysctl.flush_delay = 0;
847 net->ipv6.sysctl.ip6_rt_max_size = 4096;
848 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
849 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
850 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
851 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
852 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
853 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
854 net->ipv6.sysctl.icmpv6_time = 1*HZ;
855
856 return 0;
857 }
858
859 static void inet6_net_exit(struct net *net)
860 {
861 return;
862 }
863
864 static struct pernet_operations inet6_net_ops = {
865 .init = inet6_net_init,
866 .exit = inet6_net_exit,
867 };
868
869 static int __init inet6_init(void)
870 {
871 struct sk_buff *dummy_skb;
872 struct list_head *r;
873 int err;
874
875 BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
876
877 err = proto_register(&tcpv6_prot, 1);
878 if (err)
879 goto out;
880
881 err = proto_register(&udpv6_prot, 1);
882 if (err)
883 goto out_unregister_tcp_proto;
884
885 err = proto_register(&udplitev6_prot, 1);
886 if (err)
887 goto out_unregister_udp_proto;
888
889 err = proto_register(&rawv6_prot, 1);
890 if (err)
891 goto out_unregister_udplite_proto;
892
893
894 /* Register the socket-side information for inet6_create. */
895 for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
896 INIT_LIST_HEAD(r);
897
898 /* We MUST register RAW sockets before we create the ICMP6,
899 * IGMP6, or NDISC control sockets.
900 */
901 err = rawv6_init();
902 if (err)
903 goto out_unregister_raw_proto;
904
905 /* Register the family here so that the init calls below will
906 * be able to create sockets. (?? is this dangerous ??)
907 */
908 err = sock_register(&inet6_family_ops);
909 if (err)
910 goto out_sock_register_fail;
911
912 /* Initialise ipv6 mibs */
913 err = init_ipv6_mibs();
914 if (err)
915 goto out_unregister_sock;
916
917 /*
918 * ipngwg API draft makes clear that the correct semantics
919 * for TCP and UDP is to consider one TCP and UDP instance
920 * in a host availiable by both INET and INET6 APIs and
921 * able to communicate via both network protocols.
922 */
923
924 err = register_pernet_subsys(&inet6_net_ops);
925 if (err)
926 goto register_pernet_fail;
927 err = icmpv6_init();
928 if (err)
929 goto icmp_fail;
930 err = ndisc_init();
931 if (err)
932 goto ndisc_fail;
933 err = igmp6_init();
934 if (err)
935 goto igmp_fail;
936 err = ipv6_netfilter_init();
937 if (err)
938 goto netfilter_fail;
939 /* Create /proc/foo6 entries. */
940 #ifdef CONFIG_PROC_FS
941 err = -ENOMEM;
942 if (raw6_proc_init())
943 goto proc_raw6_fail;
944 if (tcp6_proc_init())
945 goto proc_tcp6_fail;
946 if (udp6_proc_init())
947 goto proc_udp6_fail;
948 if (udplite6_proc_init())
949 goto proc_udplite6_fail;
950 if (ipv6_misc_proc_init())
951 goto proc_misc6_fail;
952
953 if (ac6_proc_init())
954 goto proc_anycast6_fail;
955 if (if6_proc_init())
956 goto proc_if6_fail;
957 #endif
958 err = ip6_route_init();
959 if (err)
960 goto ip6_route_fail;
961 err = ip6_flowlabel_init();
962 if (err)
963 goto ip6_flowlabel_fail;
964 err = addrconf_init();
965 if (err)
966 goto addrconf_fail;
967
968 /* Init v6 extension headers. */
969 err = ipv6_exthdrs_init();
970 if (err)
971 goto ipv6_exthdrs_fail;
972
973 err = ipv6_frag_init();
974 if (err)
975 goto ipv6_frag_fail;
976
977 /* Init v6 transport protocols. */
978 err = udpv6_init();
979 if (err)
980 goto udpv6_fail;
981
982 err = udplitev6_init();
983 if (err)
984 goto udplitev6_fail;
985
986 err = tcpv6_init();
987 if (err)
988 goto tcpv6_fail;
989
990 err = ipv6_packet_init();
991 if (err)
992 goto ipv6_packet_fail;
993
994 #ifdef CONFIG_SYSCTL
995 err = ipv6_sysctl_register();
996 if (err)
997 goto sysctl_fail;
998 #endif
999 out:
1000 return err;
1001
1002 #ifdef CONFIG_SYSCTL
1003 sysctl_fail:
1004 ipv6_packet_cleanup();
1005 #endif
1006 ipv6_packet_fail:
1007 tcpv6_exit();
1008 tcpv6_fail:
1009 udplitev6_exit();
1010 udplitev6_fail:
1011 udpv6_exit();
1012 udpv6_fail:
1013 ipv6_frag_exit();
1014 ipv6_frag_fail:
1015 ipv6_exthdrs_exit();
1016 ipv6_exthdrs_fail:
1017 addrconf_cleanup();
1018 addrconf_fail:
1019 ip6_flowlabel_cleanup();
1020 ip6_flowlabel_fail:
1021 ip6_route_cleanup();
1022 ip6_route_fail:
1023 #ifdef CONFIG_PROC_FS
1024 if6_proc_exit();
1025 proc_if6_fail:
1026 ac6_proc_exit();
1027 proc_anycast6_fail:
1028 ipv6_misc_proc_exit();
1029 proc_misc6_fail:
1030 udplite6_proc_exit();
1031 proc_udplite6_fail:
1032 udp6_proc_exit();
1033 proc_udp6_fail:
1034 tcp6_proc_exit();
1035 proc_tcp6_fail:
1036 raw6_proc_exit();
1037 proc_raw6_fail:
1038 #endif
1039 ipv6_netfilter_fini();
1040 netfilter_fail:
1041 igmp6_cleanup();
1042 igmp_fail:
1043 ndisc_cleanup();
1044 ndisc_fail:
1045 icmpv6_cleanup();
1046 icmp_fail:
1047 unregister_pernet_subsys(&inet6_net_ops);
1048 register_pernet_fail:
1049 cleanup_ipv6_mibs();
1050 out_unregister_sock:
1051 sock_unregister(PF_INET6);
1052 rtnl_unregister_all(PF_INET6);
1053 out_sock_register_fail:
1054 rawv6_exit();
1055 out_unregister_raw_proto:
1056 proto_unregister(&rawv6_prot);
1057 out_unregister_udplite_proto:
1058 proto_unregister(&udplitev6_prot);
1059 out_unregister_udp_proto:
1060 proto_unregister(&udpv6_prot);
1061 out_unregister_tcp_proto:
1062 proto_unregister(&tcpv6_prot);
1063 goto out;
1064 }
1065 module_init(inet6_init);
1066
1067 static void __exit inet6_exit(void)
1068 {
1069 /* First of all disallow new sockets creation. */
1070 sock_unregister(PF_INET6);
1071 /* Disallow any further netlink messages */
1072 rtnl_unregister_all(PF_INET6);
1073
1074 #ifdef CONFIG_SYSCTL
1075 ipv6_sysctl_unregister();
1076 #endif
1077 udpv6_exit();
1078 udplitev6_exit();
1079 tcpv6_exit();
1080
1081 /* Cleanup code parts. */
1082 ipv6_packet_cleanup();
1083 ipv6_frag_exit();
1084 ipv6_exthdrs_exit();
1085 addrconf_cleanup();
1086 ip6_flowlabel_cleanup();
1087 ip6_route_cleanup();
1088 #ifdef CONFIG_PROC_FS
1089
1090 /* Cleanup code parts. */
1091 if6_proc_exit();
1092 ac6_proc_exit();
1093 ipv6_misc_proc_exit();
1094 udplite6_proc_exit();
1095 udp6_proc_exit();
1096 tcp6_proc_exit();
1097 raw6_proc_exit();
1098 #endif
1099 ipv6_netfilter_fini();
1100 igmp6_cleanup();
1101 ndisc_cleanup();
1102 icmpv6_cleanup();
1103 rawv6_exit();
1104
1105 unregister_pernet_subsys(&inet6_net_ops);
1106 cleanup_ipv6_mibs();
1107 proto_unregister(&rawv6_prot);
1108 proto_unregister(&udplitev6_prot);
1109 proto_unregister(&udpv6_prot);
1110 proto_unregister(&tcpv6_prot);
1111 }
1112 module_exit(inet6_exit);
1113
1114 MODULE_ALIAS_NETPROTO(PF_INET6);
Linux kernel - Deliverables
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