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Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux...
[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 * 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/route.h>
54 #include <net/transp_v6.h>
55 #include <net/ip6_route.h>
56 #include <net/addrconf.h>
57 #ifdef CONFIG_IPV6_TUNNEL
58 #include <net/ip6_tunnel.h>
59 #endif
60
61 #include <asm/uaccess.h>
62 #include <asm/system.h>
63 #include <linux/mroute6.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 struct ipv6_params ipv6_defaults = {
76 .disable_ipv6 = 0,
77 .autoconf = 1,
78 };
79
80 static int disable_ipv6_mod = 0;
81
82 module_param_named(disable, disable_ipv6_mod, int, 0444);
83 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
84
85 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
86 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
87
88 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
89 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
90
91 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
92 {
93 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
94
95 return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
96 }
97
98 static int inet6_create(struct net *net, struct socket *sock, int protocol)
99 {
100 struct inet_sock *inet;
101 struct ipv6_pinfo *np;
102 struct sock *sk;
103 struct inet_protosw *answer;
104 struct proto *answer_prot;
105 unsigned char answer_flags;
106 char answer_no_check;
107 int try_loading_module = 0;
108 int err;
109
110 if (sock->type != SOCK_RAW &&
111 sock->type != SOCK_DGRAM &&
112 !inet_ehash_secret)
113 build_ehash_secret();
114
115 /* Look for the requested type/protocol pair. */
116 lookup_protocol:
117 err = -ESOCKTNOSUPPORT;
118 rcu_read_lock();
119 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
120
121 err = 0;
122 /* Check the non-wild match. */
123 if (protocol == answer->protocol) {
124 if (protocol != IPPROTO_IP)
125 break;
126 } else {
127 /* Check for the two wild cases. */
128 if (IPPROTO_IP == protocol) {
129 protocol = answer->protocol;
130 break;
131 }
132 if (IPPROTO_IP == answer->protocol)
133 break;
134 }
135 err = -EPROTONOSUPPORT;
136 }
137
138 if (err) {
139 if (try_loading_module < 2) {
140 rcu_read_unlock();
141 /*
142 * Be more specific, e.g. net-pf-10-proto-132-type-1
143 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
144 */
145 if (++try_loading_module == 1)
146 request_module("net-pf-%d-proto-%d-type-%d",
147 PF_INET6, protocol, sock->type);
148 /*
149 * Fall back to generic, e.g. net-pf-10-proto-132
150 * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
151 */
152 else
153 request_module("net-pf-%d-proto-%d",
154 PF_INET6, protocol);
155 goto lookup_protocol;
156 } else
157 goto out_rcu_unlock;
158 }
159
160 err = -EPERM;
161 if (answer->capability > 0 && !capable(answer->capability))
162 goto out_rcu_unlock;
163
164 sock->ops = answer->ops;
165 answer_prot = answer->prot;
166 answer_no_check = answer->no_check;
167 answer_flags = answer->flags;
168 rcu_read_unlock();
169
170 WARN_ON(answer_prot->slab == NULL);
171
172 err = -ENOBUFS;
173 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot);
174 if (sk == NULL)
175 goto out;
176
177 sock_init_data(sock, sk);
178
179 err = 0;
180 sk->sk_no_check = answer_no_check;
181 if (INET_PROTOSW_REUSE & answer_flags)
182 sk->sk_reuse = 1;
183
184 inet = inet_sk(sk);
185 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
186
187 if (SOCK_RAW == sock->type) {
188 inet->num = protocol;
189 if (IPPROTO_RAW == protocol)
190 inet->hdrincl = 1;
191 }
192
193 sk->sk_destruct = inet_sock_destruct;
194 sk->sk_family = PF_INET6;
195 sk->sk_protocol = protocol;
196
197 sk->sk_backlog_rcv = answer->prot->backlog_rcv;
198
199 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
200 np->hop_limit = -1;
201 np->mcast_hops = -1;
202 np->mc_loop = 1;
203 np->pmtudisc = IPV6_PMTUDISC_WANT;
204 np->ipv6only = net->ipv6.sysctl.bindv6only;
205
206 /* Init the ipv4 part of the socket since we can have sockets
207 * using v6 API for ipv4.
208 */
209 inet->uc_ttl = -1;
210
211 inet->mc_loop = 1;
212 inet->mc_ttl = 1;
213 inet->mc_index = 0;
214 inet->mc_list = NULL;
215
216 if (ipv4_config.no_pmtu_disc)
217 inet->pmtudisc = IP_PMTUDISC_DONT;
218 else
219 inet->pmtudisc = IP_PMTUDISC_WANT;
220 /*
221 * Increment only the relevant sk_prot->socks debug field, this changes
222 * the previous behaviour of incrementing both the equivalent to
223 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
224 *
225 * This allows better debug granularity as we'll know exactly how many
226 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
227 * transport protocol socks. -acme
228 */
229 sk_refcnt_debug_inc(sk);
230
231 if (inet->num) {
232 /* It assumes that any protocol which allows
233 * the user to assign a number at socket
234 * creation time automatically shares.
235 */
236 inet->sport = htons(inet->num);
237 sk->sk_prot->hash(sk);
238 }
239 if (sk->sk_prot->init) {
240 err = sk->sk_prot->init(sk);
241 if (err) {
242 sk_common_release(sk);
243 goto out;
244 }
245 }
246 out:
247 return err;
248 out_rcu_unlock:
249 rcu_read_unlock();
250 goto out;
251 }
252
253
254 /* bind for INET6 API */
255 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
256 {
257 struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
258 struct sock *sk = sock->sk;
259 struct inet_sock *inet = inet_sk(sk);
260 struct ipv6_pinfo *np = inet6_sk(sk);
261 struct net *net = sock_net(sk);
262 __be32 v4addr = 0;
263 unsigned short snum;
264 int addr_type = 0;
265 int err = 0;
266
267 /* If the socket has its own bind function then use it. */
268 if (sk->sk_prot->bind)
269 return sk->sk_prot->bind(sk, uaddr, addr_len);
270
271 if (addr_len < SIN6_LEN_RFC2133)
272 return -EINVAL;
273 addr_type = ipv6_addr_type(&addr->sin6_addr);
274 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
275 return -EINVAL;
276
277 snum = ntohs(addr->sin6_port);
278 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
279 return -EACCES;
280
281 lock_sock(sk);
282
283 /* Check these errors (active socket, double bind). */
284 if (sk->sk_state != TCP_CLOSE || inet->num) {
285 err = -EINVAL;
286 goto out;
287 }
288
289 /* Check if the address belongs to the host. */
290 if (addr_type == IPV6_ADDR_MAPPED) {
291 int chk_addr_ret;
292
293 /* Binding to v4-mapped address on a v6-only socket
294 * makes no sense
295 */
296 if (np->ipv6only) {
297 err = -EINVAL;
298 goto out;
299 }
300
301 /* Reproduce AF_INET checks to make the bindings consitant */
302 v4addr = addr->sin6_addr.s6_addr32[3];
303 chk_addr_ret = inet_addr_type(net, v4addr);
304 if (!sysctl_ip_nonlocal_bind &&
305 !(inet->freebind || inet->transparent) &&
306 v4addr != htonl(INADDR_ANY) &&
307 chk_addr_ret != RTN_LOCAL &&
308 chk_addr_ret != RTN_MULTICAST &&
309 chk_addr_ret != RTN_BROADCAST) {
310 err = -EADDRNOTAVAIL;
311 goto out;
312 }
313 } else {
314 if (addr_type != IPV6_ADDR_ANY) {
315 struct net_device *dev = NULL;
316
317 if (addr_type & IPV6_ADDR_LINKLOCAL) {
318 if (addr_len >= sizeof(struct sockaddr_in6) &&
319 addr->sin6_scope_id) {
320 /* Override any existing binding, if another one
321 * is supplied by user.
322 */
323 sk->sk_bound_dev_if = addr->sin6_scope_id;
324 }
325
326 /* Binding to link-local address requires an interface */
327 if (!sk->sk_bound_dev_if) {
328 err = -EINVAL;
329 goto out;
330 }
331 dev = dev_get_by_index(net, sk->sk_bound_dev_if);
332 if (!dev) {
333 err = -ENODEV;
334 goto out;
335 }
336 }
337
338 /* ipv4 addr of the socket is invalid. Only the
339 * unspecified and mapped address have a v4 equivalent.
340 */
341 v4addr = LOOPBACK4_IPV6;
342 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
343 if (!ipv6_chk_addr(net, &addr->sin6_addr,
344 dev, 0)) {
345 if (dev)
346 dev_put(dev);
347 err = -EADDRNOTAVAIL;
348 goto out;
349 }
350 }
351 if (dev)
352 dev_put(dev);
353 }
354 }
355
356 inet->rcv_saddr = v4addr;
357 inet->saddr = v4addr;
358
359 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
360
361 if (!(addr_type & IPV6_ADDR_MULTICAST))
362 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
363
364 /* Make sure we are allowed to bind here. */
365 if (sk->sk_prot->get_port(sk, snum)) {
366 inet_reset_saddr(sk);
367 err = -EADDRINUSE;
368 goto out;
369 }
370
371 if (addr_type != IPV6_ADDR_ANY) {
372 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
373 if (addr_type != IPV6_ADDR_MAPPED)
374 np->ipv6only = 1;
375 }
376 if (snum)
377 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
378 inet->sport = htons(inet->num);
379 inet->dport = 0;
380 inet->daddr = 0;
381 out:
382 release_sock(sk);
383 return err;
384 }
385
386 EXPORT_SYMBOL(inet6_bind);
387
388 int inet6_release(struct socket *sock)
389 {
390 struct sock *sk = sock->sk;
391
392 if (sk == NULL)
393 return -EINVAL;
394
395 /* Free mc lists */
396 ipv6_sock_mc_close(sk);
397
398 /* Free ac lists */
399 ipv6_sock_ac_close(sk);
400
401 return inet_release(sock);
402 }
403
404 EXPORT_SYMBOL(inet6_release);
405
406 void inet6_destroy_sock(struct sock *sk)
407 {
408 struct ipv6_pinfo *np = inet6_sk(sk);
409 struct sk_buff *skb;
410 struct ipv6_txoptions *opt;
411
412 /* Release rx options */
413
414 if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
415 kfree_skb(skb);
416
417 /* Free flowlabels */
418 fl6_free_socklist(sk);
419
420 /* Free tx options */
421
422 if ((opt = xchg(&np->opt, NULL)) != NULL)
423 sock_kfree_s(sk, opt, opt->tot_len);
424 }
425
426 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
427
428 /*
429 * This does both peername and sockname.
430 */
431
432 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
433 int *uaddr_len, int peer)
434 {
435 struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
436 struct sock *sk = sock->sk;
437 struct inet_sock *inet = inet_sk(sk);
438 struct ipv6_pinfo *np = inet6_sk(sk);
439
440 sin->sin6_family = AF_INET6;
441 sin->sin6_flowinfo = 0;
442 sin->sin6_scope_id = 0;
443 if (peer) {
444 if (!inet->dport)
445 return -ENOTCONN;
446 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
447 peer == 1)
448 return -ENOTCONN;
449 sin->sin6_port = inet->dport;
450 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
451 if (np->sndflow)
452 sin->sin6_flowinfo = np->flow_label;
453 } else {
454 if (ipv6_addr_any(&np->rcv_saddr))
455 ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
456 else
457 ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
458
459 sin->sin6_port = inet->sport;
460 }
461 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
462 sin->sin6_scope_id = sk->sk_bound_dev_if;
463 *uaddr_len = sizeof(*sin);
464 return(0);
465 }
466
467 EXPORT_SYMBOL(inet6_getname);
468
469 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
470 {
471 struct sock *sk = sock->sk;
472 struct net *net = sock_net(sk);
473
474 switch(cmd)
475 {
476 case SIOCGSTAMP:
477 return sock_get_timestamp(sk, (struct timeval __user *)arg);
478
479 case SIOCGSTAMPNS:
480 return sock_get_timestampns(sk, (struct timespec __user *)arg);
481
482 case SIOCADDRT:
483 case SIOCDELRT:
484
485 return(ipv6_route_ioctl(net, cmd, (void __user *)arg));
486
487 case SIOCSIFADDR:
488 return addrconf_add_ifaddr(net, (void __user *) arg);
489 case SIOCDIFADDR:
490 return addrconf_del_ifaddr(net, (void __user *) arg);
491 case SIOCSIFDSTADDR:
492 return addrconf_set_dstaddr(net, (void __user *) arg);
493 default:
494 if (!sk->sk_prot->ioctl)
495 return -ENOIOCTLCMD;
496 return sk->sk_prot->ioctl(sk, cmd, arg);
497 }
498 /*NOTREACHED*/
499 return(0);
500 }
501
502 EXPORT_SYMBOL(inet6_ioctl);
503
504 const struct proto_ops inet6_stream_ops = {
505 .family = PF_INET6,
506 .owner = THIS_MODULE,
507 .release = inet6_release,
508 .bind = inet6_bind,
509 .connect = inet_stream_connect, /* ok */
510 .socketpair = sock_no_socketpair, /* a do nothing */
511 .accept = inet_accept, /* ok */
512 .getname = inet6_getname,
513 .poll = tcp_poll, /* ok */
514 .ioctl = inet6_ioctl, /* must change */
515 .listen = inet_listen, /* ok */
516 .shutdown = inet_shutdown, /* ok */
517 .setsockopt = sock_common_setsockopt, /* ok */
518 .getsockopt = sock_common_getsockopt, /* ok */
519 .sendmsg = tcp_sendmsg, /* ok */
520 .recvmsg = sock_common_recvmsg, /* ok */
521 .mmap = sock_no_mmap,
522 .sendpage = tcp_sendpage,
523 .splice_read = tcp_splice_read,
524 #ifdef CONFIG_COMPAT
525 .compat_setsockopt = compat_sock_common_setsockopt,
526 .compat_getsockopt = compat_sock_common_getsockopt,
527 #endif
528 };
529
530 const struct proto_ops inet6_dgram_ops = {
531 .family = PF_INET6,
532 .owner = THIS_MODULE,
533 .release = inet6_release,
534 .bind = inet6_bind,
535 .connect = inet_dgram_connect, /* ok */
536 .socketpair = sock_no_socketpair, /* a do nothing */
537 .accept = sock_no_accept, /* a do nothing */
538 .getname = inet6_getname,
539 .poll = udp_poll, /* ok */
540 .ioctl = inet6_ioctl, /* must change */
541 .listen = sock_no_listen, /* ok */
542 .shutdown = inet_shutdown, /* ok */
543 .setsockopt = sock_common_setsockopt, /* ok */
544 .getsockopt = sock_common_getsockopt, /* ok */
545 .sendmsg = inet_sendmsg, /* ok */
546 .recvmsg = sock_common_recvmsg, /* ok */
547 .mmap = sock_no_mmap,
548 .sendpage = sock_no_sendpage,
549 #ifdef CONFIG_COMPAT
550 .compat_setsockopt = compat_sock_common_setsockopt,
551 .compat_getsockopt = compat_sock_common_getsockopt,
552 #endif
553 };
554
555 static struct net_proto_family inet6_family_ops = {
556 .family = PF_INET6,
557 .create = inet6_create,
558 .owner = THIS_MODULE,
559 };
560
561 int inet6_register_protosw(struct inet_protosw *p)
562 {
563 struct list_head *lh;
564 struct inet_protosw *answer;
565 struct list_head *last_perm;
566 int protocol = p->protocol;
567 int ret;
568
569 spin_lock_bh(&inetsw6_lock);
570
571 ret = -EINVAL;
572 if (p->type >= SOCK_MAX)
573 goto out_illegal;
574
575 /* If we are trying to override a permanent protocol, bail. */
576 answer = NULL;
577 ret = -EPERM;
578 last_perm = &inetsw6[p->type];
579 list_for_each(lh, &inetsw6[p->type]) {
580 answer = list_entry(lh, struct inet_protosw, list);
581
582 /* Check only the non-wild match. */
583 if (INET_PROTOSW_PERMANENT & answer->flags) {
584 if (protocol == answer->protocol)
585 break;
586 last_perm = lh;
587 }
588
589 answer = NULL;
590 }
591 if (answer)
592 goto out_permanent;
593
594 /* Add the new entry after the last permanent entry if any, so that
595 * the new entry does not override a permanent entry when matched with
596 * a wild-card protocol. But it is allowed to override any existing
597 * non-permanent entry. This means that when we remove this entry, the
598 * system automatically returns to the old behavior.
599 */
600 list_add_rcu(&p->list, last_perm);
601 ret = 0;
602 out:
603 spin_unlock_bh(&inetsw6_lock);
604 return ret;
605
606 out_permanent:
607 printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
608 protocol);
609 goto out;
610
611 out_illegal:
612 printk(KERN_ERR
613 "Ignoring attempt to register invalid socket type %d.\n",
614 p->type);
615 goto out;
616 }
617
618 EXPORT_SYMBOL(inet6_register_protosw);
619
620 void
621 inet6_unregister_protosw(struct inet_protosw *p)
622 {
623 if (INET_PROTOSW_PERMANENT & p->flags) {
624 printk(KERN_ERR
625 "Attempt to unregister permanent protocol %d.\n",
626 p->protocol);
627 } else {
628 spin_lock_bh(&inetsw6_lock);
629 list_del_rcu(&p->list);
630 spin_unlock_bh(&inetsw6_lock);
631
632 synchronize_net();
633 }
634 }
635
636 EXPORT_SYMBOL(inet6_unregister_protosw);
637
638 int inet6_sk_rebuild_header(struct sock *sk)
639 {
640 int err;
641 struct dst_entry *dst;
642 struct ipv6_pinfo *np = inet6_sk(sk);
643
644 dst = __sk_dst_check(sk, np->dst_cookie);
645
646 if (dst == NULL) {
647 struct inet_sock *inet = inet_sk(sk);
648 struct in6_addr *final_p = NULL, final;
649 struct flowi fl;
650
651 memset(&fl, 0, sizeof(fl));
652 fl.proto = sk->sk_protocol;
653 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
654 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
655 fl.fl6_flowlabel = np->flow_label;
656 fl.oif = sk->sk_bound_dev_if;
657 fl.fl_ip_dport = inet->dport;
658 fl.fl_ip_sport = inet->sport;
659 security_sk_classify_flow(sk, &fl);
660
661 if (np->opt && np->opt->srcrt) {
662 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
663 ipv6_addr_copy(&final, &fl.fl6_dst);
664 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
665 final_p = &final;
666 }
667
668 err = ip6_dst_lookup(sk, &dst, &fl);
669 if (err) {
670 sk->sk_route_caps = 0;
671 return err;
672 }
673 if (final_p)
674 ipv6_addr_copy(&fl.fl6_dst, final_p);
675
676 if ((err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0) {
677 sk->sk_err_soft = -err;
678 return err;
679 }
680
681 __ip6_dst_store(sk, dst, NULL, NULL);
682 }
683
684 return 0;
685 }
686
687 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
688
689 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
690 {
691 struct ipv6_pinfo *np = inet6_sk(sk);
692 struct inet6_skb_parm *opt = IP6CB(skb);
693
694 if (np->rxopt.all) {
695 if ((opt->hop && (np->rxopt.bits.hopopts ||
696 np->rxopt.bits.ohopopts)) ||
697 ((IPV6_FLOWINFO_MASK &
698 *(__be32 *)skb_network_header(skb)) &&
699 np->rxopt.bits.rxflow) ||
700 (opt->srcrt && (np->rxopt.bits.srcrt ||
701 np->rxopt.bits.osrcrt)) ||
702 ((opt->dst1 || opt->dst0) &&
703 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
704 return 1;
705 }
706 return 0;
707 }
708
709 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
710
711 static int ipv6_gso_pull_exthdrs(struct sk_buff *skb, int proto)
712 {
713 const struct inet6_protocol *ops = NULL;
714
715 for (;;) {
716 struct ipv6_opt_hdr *opth;
717 int len;
718
719 if (proto != NEXTHDR_HOP) {
720 ops = rcu_dereference(inet6_protos[proto]);
721
722 if (unlikely(!ops))
723 break;
724
725 if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
726 break;
727 }
728
729 if (unlikely(!pskb_may_pull(skb, 8)))
730 break;
731
732 opth = (void *)skb->data;
733 len = ipv6_optlen(opth);
734
735 if (unlikely(!pskb_may_pull(skb, len)))
736 break;
737
738 proto = opth->nexthdr;
739 __skb_pull(skb, len);
740 }
741
742 return proto;
743 }
744
745 static int ipv6_gso_send_check(struct sk_buff *skb)
746 {
747 struct ipv6hdr *ipv6h;
748 const struct inet6_protocol *ops;
749 int err = -EINVAL;
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 err = -EPROTONOSUPPORT;
757
758 rcu_read_lock();
759 ops = rcu_dereference(inet6_protos[
760 ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]);
761
762 if (likely(ops && ops->gso_send_check)) {
763 skb_reset_transport_header(skb);
764 err = ops->gso_send_check(skb);
765 }
766 rcu_read_unlock();
767
768 out:
769 return err;
770 }
771
772 static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features)
773 {
774 struct sk_buff *segs = ERR_PTR(-EINVAL);
775 struct ipv6hdr *ipv6h;
776 const struct inet6_protocol *ops;
777 int proto;
778 struct frag_hdr *fptr;
779 unsigned int unfrag_ip6hlen;
780 u8 *prevhdr;
781 int offset = 0;
782
783 if (!(features & NETIF_F_V6_CSUM))
784 features &= ~NETIF_F_SG;
785
786 if (unlikely(skb_shinfo(skb)->gso_type &
787 ~(SKB_GSO_UDP |
788 SKB_GSO_DODGY |
789 SKB_GSO_TCP_ECN |
790 SKB_GSO_TCPV6 |
791 0)))
792 goto out;
793
794 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
795 goto out;
796
797 ipv6h = ipv6_hdr(skb);
798 __skb_pull(skb, sizeof(*ipv6h));
799 segs = ERR_PTR(-EPROTONOSUPPORT);
800
801 proto = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
802 rcu_read_lock();
803 ops = rcu_dereference(inet6_protos[proto]);
804 if (likely(ops && ops->gso_segment)) {
805 skb_reset_transport_header(skb);
806 segs = ops->gso_segment(skb, features);
807 }
808 rcu_read_unlock();
809
810 if (unlikely(IS_ERR(segs)))
811 goto out;
812
813 for (skb = segs; skb; skb = skb->next) {
814 ipv6h = ipv6_hdr(skb);
815 ipv6h->payload_len = htons(skb->len - skb->mac_len -
816 sizeof(*ipv6h));
817 if (proto == IPPROTO_UDP) {
818 unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
819 fptr = (struct frag_hdr *)(skb_network_header(skb) +
820 unfrag_ip6hlen);
821 fptr->frag_off = htons(offset);
822 if (skb->next != NULL)
823 fptr->frag_off |= htons(IP6_MF);
824 offset += (ntohs(ipv6h->payload_len) -
825 sizeof(struct frag_hdr));
826 }
827 }
828
829 out:
830 return segs;
831 }
832
833 struct ipv6_gro_cb {
834 struct napi_gro_cb napi;
835 int proto;
836 };
837
838 #define IPV6_GRO_CB(skb) ((struct ipv6_gro_cb *)(skb)->cb)
839
840 static struct sk_buff **ipv6_gro_receive(struct sk_buff **head,
841 struct sk_buff *skb)
842 {
843 const struct inet6_protocol *ops;
844 struct sk_buff **pp = NULL;
845 struct sk_buff *p;
846 struct ipv6hdr *iph;
847 unsigned int nlen;
848 unsigned int hlen;
849 unsigned int off;
850 int flush = 1;
851 int proto;
852 __wsum csum;
853
854 off = skb_gro_offset(skb);
855 hlen = off + sizeof(*iph);
856 iph = skb_gro_header_fast(skb, off);
857 if (skb_gro_header_hard(skb, hlen)) {
858 iph = skb_gro_header_slow(skb, hlen, off);
859 if (unlikely(!iph))
860 goto out;
861 }
862
863 skb_gro_pull(skb, sizeof(*iph));
864 skb_set_transport_header(skb, skb_gro_offset(skb));
865
866 flush += ntohs(iph->payload_len) != skb_gro_len(skb);
867
868 rcu_read_lock();
869 proto = iph->nexthdr;
870 ops = rcu_dereference(inet6_protos[proto]);
871 if (!ops || !ops->gro_receive) {
872 __pskb_pull(skb, skb_gro_offset(skb));
873 proto = ipv6_gso_pull_exthdrs(skb, proto);
874 skb_gro_pull(skb, -skb_transport_offset(skb));
875 skb_reset_transport_header(skb);
876 __skb_push(skb, skb_gro_offset(skb));
877
878 if (!ops || !ops->gro_receive)
879 goto out_unlock;
880
881 iph = ipv6_hdr(skb);
882 }
883
884 IPV6_GRO_CB(skb)->proto = proto;
885
886 flush--;
887 nlen = skb_network_header_len(skb);
888
889 for (p = *head; p; p = p->next) {
890 struct ipv6hdr *iph2;
891
892 if (!NAPI_GRO_CB(p)->same_flow)
893 continue;
894
895 iph2 = ipv6_hdr(p);
896
897 /* All fields must match except length. */
898 if (nlen != skb_network_header_len(p) ||
899 memcmp(iph, iph2, offsetof(struct ipv6hdr, payload_len)) ||
900 memcmp(&iph->nexthdr, &iph2->nexthdr,
901 nlen - offsetof(struct ipv6hdr, nexthdr))) {
902 NAPI_GRO_CB(p)->same_flow = 0;
903 continue;
904 }
905
906 NAPI_GRO_CB(p)->flush |= flush;
907 }
908
909 NAPI_GRO_CB(skb)->flush |= flush;
910
911 csum = skb->csum;
912 skb_postpull_rcsum(skb, iph, skb_network_header_len(skb));
913
914 pp = ops->gro_receive(head, skb);
915
916 skb->csum = csum;
917
918 out_unlock:
919 rcu_read_unlock();
920
921 out:
922 NAPI_GRO_CB(skb)->flush |= flush;
923
924 return pp;
925 }
926
927 static int ipv6_gro_complete(struct sk_buff *skb)
928 {
929 const struct inet6_protocol *ops;
930 struct ipv6hdr *iph = ipv6_hdr(skb);
931 int err = -ENOSYS;
932
933 iph->payload_len = htons(skb->len - skb_network_offset(skb) -
934 sizeof(*iph));
935
936 rcu_read_lock();
937 ops = rcu_dereference(inet6_protos[IPV6_GRO_CB(skb)->proto]);
938 if (WARN_ON(!ops || !ops->gro_complete))
939 goto out_unlock;
940
941 err = ops->gro_complete(skb);
942
943 out_unlock:
944 rcu_read_unlock();
945
946 return err;
947 }
948
949 static struct packet_type ipv6_packet_type __read_mostly = {
950 .type = cpu_to_be16(ETH_P_IPV6),
951 .func = ipv6_rcv,
952 .gso_send_check = ipv6_gso_send_check,
953 .gso_segment = ipv6_gso_segment,
954 .gro_receive = ipv6_gro_receive,
955 .gro_complete = ipv6_gro_complete,
956 };
957
958 static int __init ipv6_packet_init(void)
959 {
960 dev_add_pack(&ipv6_packet_type);
961 return 0;
962 }
963
964 static void ipv6_packet_cleanup(void)
965 {
966 dev_remove_pack(&ipv6_packet_type);
967 }
968
969 static int __net_init ipv6_init_mibs(struct net *net)
970 {
971 if (snmp_mib_init((void **)net->mib.udp_stats_in6,
972 sizeof (struct udp_mib)) < 0)
973 return -ENOMEM;
974 if (snmp_mib_init((void **)net->mib.udplite_stats_in6,
975 sizeof (struct udp_mib)) < 0)
976 goto err_udplite_mib;
977 if (snmp_mib_init((void **)net->mib.ipv6_statistics,
978 sizeof(struct ipstats_mib)) < 0)
979 goto err_ip_mib;
980 if (snmp_mib_init((void **)net->mib.icmpv6_statistics,
981 sizeof(struct icmpv6_mib)) < 0)
982 goto err_icmp_mib;
983 if (snmp_mib_init((void **)net->mib.icmpv6msg_statistics,
984 sizeof(struct icmpv6msg_mib)) < 0)
985 goto err_icmpmsg_mib;
986 return 0;
987
988 err_icmpmsg_mib:
989 snmp_mib_free((void **)net->mib.icmpv6_statistics);
990 err_icmp_mib:
991 snmp_mib_free((void **)net->mib.ipv6_statistics);
992 err_ip_mib:
993 snmp_mib_free((void **)net->mib.udplite_stats_in6);
994 err_udplite_mib:
995 snmp_mib_free((void **)net->mib.udp_stats_in6);
996 return -ENOMEM;
997 }
998
999 static void __net_exit ipv6_cleanup_mibs(struct net *net)
1000 {
1001 snmp_mib_free((void **)net->mib.udp_stats_in6);
1002 snmp_mib_free((void **)net->mib.udplite_stats_in6);
1003 snmp_mib_free((void **)net->mib.ipv6_statistics);
1004 snmp_mib_free((void **)net->mib.icmpv6_statistics);
1005 snmp_mib_free((void **)net->mib.icmpv6msg_statistics);
1006 }
1007
1008 static int __net_init inet6_net_init(struct net *net)
1009 {
1010 int err = 0;
1011
1012 net->ipv6.sysctl.bindv6only = 0;
1013 net->ipv6.sysctl.icmpv6_time = 1*HZ;
1014
1015 err = ipv6_init_mibs(net);
1016 if (err)
1017 return err;
1018 #ifdef CONFIG_PROC_FS
1019 err = udp6_proc_init(net);
1020 if (err)
1021 goto out;
1022 err = tcp6_proc_init(net);
1023 if (err)
1024 goto proc_tcp6_fail;
1025 err = ac6_proc_init(net);
1026 if (err)
1027 goto proc_ac6_fail;
1028 #endif
1029 return err;
1030
1031 #ifdef CONFIG_PROC_FS
1032 proc_ac6_fail:
1033 tcp6_proc_exit(net);
1034 proc_tcp6_fail:
1035 udp6_proc_exit(net);
1036 out:
1037 ipv6_cleanup_mibs(net);
1038 return err;
1039 #endif
1040 }
1041
1042 static void inet6_net_exit(struct net *net)
1043 {
1044 #ifdef CONFIG_PROC_FS
1045 udp6_proc_exit(net);
1046 tcp6_proc_exit(net);
1047 ac6_proc_exit(net);
1048 #endif
1049 ipv6_cleanup_mibs(net);
1050 }
1051
1052 static struct pernet_operations inet6_net_ops = {
1053 .init = inet6_net_init,
1054 .exit = inet6_net_exit,
1055 };
1056
1057 static int __init inet6_init(void)
1058 {
1059 struct sk_buff *dummy_skb;
1060 struct list_head *r;
1061 int err = 0;
1062
1063 BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
1064
1065 /* Register the socket-side information for inet6_create. */
1066 for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
1067 INIT_LIST_HEAD(r);
1068
1069 if (disable_ipv6_mod) {
1070 printk(KERN_INFO
1071 "IPv6: Loaded, but administratively disabled, "
1072 "reboot required to enable\n");
1073 goto out;
1074 }
1075
1076 err = proto_register(&tcpv6_prot, 1);
1077 if (err)
1078 goto out;
1079
1080 err = proto_register(&udpv6_prot, 1);
1081 if (err)
1082 goto out_unregister_tcp_proto;
1083
1084 err = proto_register(&udplitev6_prot, 1);
1085 if (err)
1086 goto out_unregister_udp_proto;
1087
1088 err = proto_register(&rawv6_prot, 1);
1089 if (err)
1090 goto out_unregister_udplite_proto;
1091
1092
1093 /* We MUST register RAW sockets before we create the ICMP6,
1094 * IGMP6, or NDISC control sockets.
1095 */
1096 err = rawv6_init();
1097 if (err)
1098 goto out_unregister_raw_proto;
1099
1100 /* Register the family here so that the init calls below will
1101 * be able to create sockets. (?? is this dangerous ??)
1102 */
1103 err = sock_register(&inet6_family_ops);
1104 if (err)
1105 goto out_sock_register_fail;
1106
1107 #ifdef CONFIG_SYSCTL
1108 err = ipv6_static_sysctl_register();
1109 if (err)
1110 goto static_sysctl_fail;
1111 #endif
1112 /*
1113 * ipngwg API draft makes clear that the correct semantics
1114 * for TCP and UDP is to consider one TCP and UDP instance
1115 * in a host availiable by both INET and INET6 APIs and
1116 * able to communicate via both network protocols.
1117 */
1118
1119 err = register_pernet_subsys(&inet6_net_ops);
1120 if (err)
1121 goto register_pernet_fail;
1122 err = icmpv6_init();
1123 if (err)
1124 goto icmp_fail;
1125 err = ip6_mr_init();
1126 if (err)
1127 goto ipmr_fail;
1128 err = ndisc_init();
1129 if (err)
1130 goto ndisc_fail;
1131 err = igmp6_init();
1132 if (err)
1133 goto igmp_fail;
1134 err = ipv6_netfilter_init();
1135 if (err)
1136 goto netfilter_fail;
1137 /* Create /proc/foo6 entries. */
1138 #ifdef CONFIG_PROC_FS
1139 err = -ENOMEM;
1140 if (raw6_proc_init())
1141 goto proc_raw6_fail;
1142 if (udplite6_proc_init())
1143 goto proc_udplite6_fail;
1144 if (ipv6_misc_proc_init())
1145 goto proc_misc6_fail;
1146 if (if6_proc_init())
1147 goto proc_if6_fail;
1148 #endif
1149 err = ip6_route_init();
1150 if (err)
1151 goto ip6_route_fail;
1152 err = ip6_flowlabel_init();
1153 if (err)
1154 goto ip6_flowlabel_fail;
1155 err = addrconf_init();
1156 if (err)
1157 goto addrconf_fail;
1158
1159 /* Init v6 extension headers. */
1160 err = ipv6_exthdrs_init();
1161 if (err)
1162 goto ipv6_exthdrs_fail;
1163
1164 err = ipv6_frag_init();
1165 if (err)
1166 goto ipv6_frag_fail;
1167
1168 /* Init v6 transport protocols. */
1169 err = udpv6_init();
1170 if (err)
1171 goto udpv6_fail;
1172
1173 err = udplitev6_init();
1174 if (err)
1175 goto udplitev6_fail;
1176
1177 err = tcpv6_init();
1178 if (err)
1179 goto tcpv6_fail;
1180
1181 err = ipv6_packet_init();
1182 if (err)
1183 goto ipv6_packet_fail;
1184
1185 #ifdef CONFIG_SYSCTL
1186 err = ipv6_sysctl_register();
1187 if (err)
1188 goto sysctl_fail;
1189 #endif
1190 out:
1191 return err;
1192
1193 #ifdef CONFIG_SYSCTL
1194 sysctl_fail:
1195 ipv6_packet_cleanup();
1196 #endif
1197 ipv6_packet_fail:
1198 tcpv6_exit();
1199 tcpv6_fail:
1200 udplitev6_exit();
1201 udplitev6_fail:
1202 udpv6_exit();
1203 udpv6_fail:
1204 ipv6_frag_exit();
1205 ipv6_frag_fail:
1206 ipv6_exthdrs_exit();
1207 ipv6_exthdrs_fail:
1208 addrconf_cleanup();
1209 addrconf_fail:
1210 ip6_flowlabel_cleanup();
1211 ip6_flowlabel_fail:
1212 ip6_route_cleanup();
1213 ip6_route_fail:
1214 #ifdef CONFIG_PROC_FS
1215 if6_proc_exit();
1216 proc_if6_fail:
1217 ipv6_misc_proc_exit();
1218 proc_misc6_fail:
1219 udplite6_proc_exit();
1220 proc_udplite6_fail:
1221 raw6_proc_exit();
1222 proc_raw6_fail:
1223 #endif
1224 ipv6_netfilter_fini();
1225 netfilter_fail:
1226 igmp6_cleanup();
1227 igmp_fail:
1228 ndisc_cleanup();
1229 ndisc_fail:
1230 ip6_mr_cleanup();
1231 ipmr_fail:
1232 icmpv6_cleanup();
1233 icmp_fail:
1234 unregister_pernet_subsys(&inet6_net_ops);
1235 register_pernet_fail:
1236 #ifdef CONFIG_SYSCTL
1237 ipv6_static_sysctl_unregister();
1238 static_sysctl_fail:
1239 #endif
1240 sock_unregister(PF_INET6);
1241 rtnl_unregister_all(PF_INET6);
1242 out_sock_register_fail:
1243 rawv6_exit();
1244 out_unregister_raw_proto:
1245 proto_unregister(&rawv6_prot);
1246 out_unregister_udplite_proto:
1247 proto_unregister(&udplitev6_prot);
1248 out_unregister_udp_proto:
1249 proto_unregister(&udpv6_prot);
1250 out_unregister_tcp_proto:
1251 proto_unregister(&tcpv6_prot);
1252 goto out;
1253 }
1254 module_init(inet6_init);
1255
1256 static void __exit inet6_exit(void)
1257 {
1258 if (disable_ipv6_mod)
1259 return;
1260
1261 /* First of all disallow new sockets creation. */
1262 sock_unregister(PF_INET6);
1263 /* Disallow any further netlink messages */
1264 rtnl_unregister_all(PF_INET6);
1265
1266 #ifdef CONFIG_SYSCTL
1267 ipv6_sysctl_unregister();
1268 #endif
1269 udpv6_exit();
1270 udplitev6_exit();
1271 tcpv6_exit();
1272
1273 /* Cleanup code parts. */
1274 ipv6_packet_cleanup();
1275 ipv6_frag_exit();
1276 ipv6_exthdrs_exit();
1277 addrconf_cleanup();
1278 ip6_flowlabel_cleanup();
1279 ip6_route_cleanup();
1280 #ifdef CONFIG_PROC_FS
1281
1282 /* Cleanup code parts. */
1283 if6_proc_exit();
1284 ipv6_misc_proc_exit();
1285 udplite6_proc_exit();
1286 raw6_proc_exit();
1287 #endif
1288 ipv6_netfilter_fini();
1289 igmp6_cleanup();
1290 ndisc_cleanup();
1291 ip6_mr_cleanup();
1292 icmpv6_cleanup();
1293 rawv6_exit();
1294
1295 unregister_pernet_subsys(&inet6_net_ops);
1296 #ifdef CONFIG_SYSCTL
1297 ipv6_static_sysctl_unregister();
1298 #endif
1299 proto_unregister(&rawv6_prot);
1300 proto_unregister(&udplitev6_prot);
1301 proto_unregister(&udpv6_prot);
1302 proto_unregister(&tcpv6_prot);
1303
1304 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1305 }
1306 module_exit(inet6_exit);
1307
1308 MODULE_ALIAS_NETPROTO(PF_INET6);
Linux kernel - Deliverables
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