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perf buildid: Fix possible unterminated readlink() result buffer
[linux-2.6/linux-mips.git] / net / ipv6 / af_inet6.c
blob3b5669a2582df03c1f1b896991fba664e137d62e
1 /*
2 * PF_INET6 socket protocol family
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * Adapted from linux/net/ipv4/af_inet.c
9 *
10 * Fixes:
11 * piggy, Karl Knutson : Socket protocol table
12 * Hideaki YOSHIFUJI : sin6_scope_id support
13 * Arnaldo Melo : check proc_net_create return, cleanups
14 *
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License
17 * as published by the Free Software Foundation; either version
18 * 2 of the License, or (at your option) any later version.
19 */
20
21
22 #include <linux/module.h>
23 #include <linux/capability.h>
24 #include <linux/errno.h>
25 #include <linux/types.h>
26 #include <linux/socket.h>
27 #include <linux/in.h>
28 #include <linux/kernel.h>
29 #include <linux/timer.h>
30 #include <linux/string.h>
31 #include <linux/sockios.h>
32 #include <linux/net.h>
33 #include <linux/fcntl.h>
34 #include <linux/mm.h>
35 #include <linux/interrupt.h>
36 #include <linux/proc_fs.h>
37 #include <linux/stat.h>
38 #include <linux/init.h>
39 #include <linux/slab.h>
40
41 #include <linux/inet.h>
42 #include <linux/netdevice.h>
43 #include <linux/icmpv6.h>
44 #include <linux/netfilter_ipv6.h>
45
46 #include <net/ip.h>
47 #include <net/ipv6.h>
48 #include <net/udp.h>
49 #include <net/udplite.h>
50 #include <net/tcp.h>
51 #include <net/ipip.h>
52 #include <net/protocol.h>
53 #include <net/inet_common.h>
54 #include <net/route.h>
55 #include <net/transp_v6.h>
56 #include <net/ip6_route.h>
57 #include <net/addrconf.h>
58 #ifdef CONFIG_IPV6_TUNNEL
59 #include <net/ip6_tunnel.h>
60 #endif
61
62 #include <asm/uaccess.h>
63 #include <asm/system.h>
64 #include <linux/mroute6.h>
65
66 MODULE_AUTHOR("Cast of dozens");
67 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
68 MODULE_LICENSE("GPL");
69
70 /* The inetsw6 table contains everything that inet6_create needs to
71 * build a new socket.
72 */
73 static struct list_head inetsw6[SOCK_MAX];
74 static DEFINE_SPINLOCK(inetsw6_lock);
75
76 struct ipv6_params ipv6_defaults = {
77 .disable_ipv6 = 0,
78 .autoconf = 1,
79 };
80
81 static int disable_ipv6_mod = 0;
82
83 module_param_named(disable, disable_ipv6_mod, int, 0444);
84 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
85
86 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
87 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
88
89 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
90 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
91
92 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
93 {
94 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
95
96 return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
97 }
98
99 static int inet6_create(struct net *net, struct socket *sock, int protocol,
100 int kern)
101 {
102 struct inet_sock *inet;
103 struct ipv6_pinfo *np;
104 struct sock *sk;
105 struct inet_protosw *answer;
106 struct proto *answer_prot;
107 unsigned char answer_flags;
108 char answer_no_check;
109 int try_loading_module = 0;
110 int err;
111
112 if (sock->type != SOCK_RAW &&
113 sock->type != SOCK_DGRAM &&
114 !inet_ehash_secret)
115 build_ehash_secret();
116
117 /* Look for the requested type/protocol pair. */
118 lookup_protocol:
119 err = -ESOCKTNOSUPPORT;
120 rcu_read_lock();
121 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
122
123 err = 0;
124 /* Check the non-wild match. */
125 if (protocol == answer->protocol) {
126 if (protocol != IPPROTO_IP)
127 break;
128 } else {
129 /* Check for the two wild cases. */
130 if (IPPROTO_IP == protocol) {
131 protocol = answer->protocol;
132 break;
133 }
134 if (IPPROTO_IP == answer->protocol)
135 break;
136 }
137 err = -EPROTONOSUPPORT;
138 }
139
140 if (err) {
141 if (try_loading_module < 2) {
142 rcu_read_unlock();
143 /*
144 * Be more specific, e.g. net-pf-10-proto-132-type-1
145 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
146 */
147 if (++try_loading_module == 1)
148 request_module("net-pf-%d-proto-%d-type-%d",
149 PF_INET6, protocol, sock->type);
150 /*
151 * Fall back to generic, e.g. net-pf-10-proto-132
152 * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
153 */
154 else
155 request_module("net-pf-%d-proto-%d",
156 PF_INET6, protocol);
157 goto lookup_protocol;
158 } else
159 goto out_rcu_unlock;
160 }
161
162 err = -EPERM;
163 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
164 goto out_rcu_unlock;
165
166 sock->ops = answer->ops;
167 answer_prot = answer->prot;
168 answer_no_check = answer->no_check;
169 answer_flags = answer->flags;
170 rcu_read_unlock();
171
172 WARN_ON(answer_prot->slab == NULL);
173
174 err = -ENOBUFS;
175 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot);
176 if (sk == NULL)
177 goto out;
178
179 sock_init_data(sock, sk);
180
181 err = 0;
182 sk->sk_no_check = answer_no_check;
183 if (INET_PROTOSW_REUSE & answer_flags)
184 sk->sk_reuse = 1;
185
186 inet = inet_sk(sk);
187 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
188
189 if (SOCK_RAW == sock->type) {
190 inet->inet_num = protocol;
191 if (IPPROTO_RAW == protocol)
192 inet->hdrincl = 1;
193 }
194
195 sk->sk_destruct = inet_sock_destruct;
196 sk->sk_family = PF_INET6;
197 sk->sk_protocol = protocol;
198
199 sk->sk_backlog_rcv = answer->prot->backlog_rcv;
200
201 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
202 np->hop_limit = -1;
203 np->mcast_hops = IPV6_DEFAULT_MCASTHOPS;
204 np->mc_loop = 1;
205 np->pmtudisc = IPV6_PMTUDISC_WANT;
206 np->ipv6only = net->ipv6.sysctl.bindv6only;
207
208 /* Init the ipv4 part of the socket since we can have sockets
209 * using v6 API for ipv4.
210 */
211 inet->uc_ttl = -1;
212
213 inet->mc_loop = 1;
214 inet->mc_ttl = 1;
215 inet->mc_index = 0;
216 inet->mc_list = NULL;
217
218 if (ipv4_config.no_pmtu_disc)
219 inet->pmtudisc = IP_PMTUDISC_DONT;
220 else
221 inet->pmtudisc = IP_PMTUDISC_WANT;
222 /*
223 * Increment only the relevant sk_prot->socks debug field, this changes
224 * the previous behaviour of incrementing both the equivalent to
225 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
226 *
227 * This allows better debug granularity as we'll know exactly how many
228 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
229 * transport protocol socks. -acme
230 */
231 sk_refcnt_debug_inc(sk);
232
233 if (inet->inet_num) {
234 /* It assumes that any protocol which allows
235 * the user to assign a number at socket
236 * creation time automatically shares.
237 */
238 inet->inet_sport = htons(inet->inet_num);
239 sk->sk_prot->hash(sk);
240 }
241 if (sk->sk_prot->init) {
242 err = sk->sk_prot->init(sk);
243 if (err) {
244 sk_common_release(sk);
245 goto out;
246 }
247 }
248 out:
249 return err;
250 out_rcu_unlock:
251 rcu_read_unlock();
252 goto out;
253 }
254
255
256 /* bind for INET6 API */
257 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
258 {
259 struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
260 struct sock *sk = sock->sk;
261 struct inet_sock *inet = inet_sk(sk);
262 struct ipv6_pinfo *np = inet6_sk(sk);
263 struct net *net = sock_net(sk);
264 __be32 v4addr = 0;
265 unsigned short snum;
266 int addr_type = 0;
267 int err = 0;
268
269 /* If the socket has its own bind function then use it. */
270 if (sk->sk_prot->bind)
271 return sk->sk_prot->bind(sk, uaddr, addr_len);
272
273 if (addr_len < SIN6_LEN_RFC2133)
274 return -EINVAL;
275
276 if (addr->sin6_family != AF_INET6)
277 return -EAFNOSUPPORT;
278
279 addr_type = ipv6_addr_type(&addr->sin6_addr);
280 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
281 return -EINVAL;
282
283 snum = ntohs(addr->sin6_port);
284 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
285 return -EACCES;
286
287 lock_sock(sk);
288
289 /* Check these errors (active socket, double bind). */
290 if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
291 err = -EINVAL;
292 goto out;
293 }
294
295 /* Check if the address belongs to the host. */
296 if (addr_type == IPV6_ADDR_MAPPED) {
297 int chk_addr_ret;
298
299 /* Binding to v4-mapped address on a v6-only socket
300 * makes no sense
301 */
302 if (np->ipv6only) {
303 err = -EINVAL;
304 goto out;
305 }
306
307 /* Reproduce AF_INET checks to make the bindings consistent */
308 v4addr = addr->sin6_addr.s6_addr32[3];
309 chk_addr_ret = inet_addr_type(net, v4addr);
310 if (!sysctl_ip_nonlocal_bind &&
311 !(inet->freebind || inet->transparent) &&
312 v4addr != htonl(INADDR_ANY) &&
313 chk_addr_ret != RTN_LOCAL &&
314 chk_addr_ret != RTN_MULTICAST &&
315 chk_addr_ret != RTN_BROADCAST) {
316 err = -EADDRNOTAVAIL;
317 goto out;
318 }
319 } else {
320 if (addr_type != IPV6_ADDR_ANY) {
321 struct net_device *dev = NULL;
322
323 rcu_read_lock();
324 if (addr_type & IPV6_ADDR_LINKLOCAL) {
325 if (addr_len >= sizeof(struct sockaddr_in6) &&
326 addr->sin6_scope_id) {
327 /* Override any existing binding, if another one
328 * is supplied by user.
329 */
330 sk->sk_bound_dev_if = addr->sin6_scope_id;
331 }
332
333 /* Binding to link-local address requires an interface */
334 if (!sk->sk_bound_dev_if) {
335 err = -EINVAL;
336 goto out_unlock;
337 }
338 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
339 if (!dev) {
340 err = -ENODEV;
341 goto out_unlock;
342 }
343 }
344
345 /* ipv4 addr of the socket is invalid. Only the
346 * unspecified and mapped address have a v4 equivalent.
347 */
348 v4addr = LOOPBACK4_IPV6;
349 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
350 if (!inet->transparent &&
351 !ipv6_chk_addr(net, &addr->sin6_addr,
352 dev, 0)) {
353 err = -EADDRNOTAVAIL;
354 goto out_unlock;
355 }
356 }
357 rcu_read_unlock();
358 }
359 }
360
361 inet->inet_rcv_saddr = v4addr;
362 inet->inet_saddr = v4addr;
363
364 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
365
366 if (!(addr_type & IPV6_ADDR_MULTICAST))
367 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
368
369 /* Make sure we are allowed to bind here. */
370 if (sk->sk_prot->get_port(sk, snum)) {
371 inet_reset_saddr(sk);
372 err = -EADDRINUSE;
373 goto out;
374 }
375
376 if (addr_type != IPV6_ADDR_ANY) {
377 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
378 if (addr_type != IPV6_ADDR_MAPPED)
379 np->ipv6only = 1;
380 }
381 if (snum)
382 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
383 inet->inet_sport = htons(inet->inet_num);
384 inet->inet_dport = 0;
385 inet->inet_daddr = 0;
386 out:
387 release_sock(sk);
388 return err;
389 out_unlock:
390 rcu_read_unlock();
391 goto out;
392 }
393
394 EXPORT_SYMBOL(inet6_bind);
395
396 int inet6_release(struct socket *sock)
397 {
398 struct sock *sk = sock->sk;
399
400 if (sk == NULL)
401 return -EINVAL;
402
403 /* Free mc lists */
404 ipv6_sock_mc_close(sk);
405
406 /* Free ac lists */
407 ipv6_sock_ac_close(sk);
408
409 return inet_release(sock);
410 }
411
412 EXPORT_SYMBOL(inet6_release);
413
414 void inet6_destroy_sock(struct sock *sk)
415 {
416 struct ipv6_pinfo *np = inet6_sk(sk);
417 struct sk_buff *skb;
418 struct ipv6_txoptions *opt;
419
420 /* Release rx options */
421
422 if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
423 kfree_skb(skb);
424
425 if ((skb = xchg(&np->rxpmtu, NULL)) != NULL)
426 kfree_skb(skb);
427
428 /* Free flowlabels */
429 fl6_free_socklist(sk);
430
431 /* Free tx options */
432
433 if ((opt = xchg(&np->opt, NULL)) != NULL)
434 sock_kfree_s(sk, opt, opt->tot_len);
435 }
436
437 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
438
439 /*
440 * This does both peername and sockname.
441 */
442
443 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
444 int *uaddr_len, int peer)
445 {
446 struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
447 struct sock *sk = sock->sk;
448 struct inet_sock *inet = inet_sk(sk);
449 struct ipv6_pinfo *np = inet6_sk(sk);
450
451 sin->sin6_family = AF_INET6;
452 sin->sin6_flowinfo = 0;
453 sin->sin6_scope_id = 0;
454 if (peer) {
455 if (!inet->inet_dport)
456 return -ENOTCONN;
457 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
458 peer == 1)
459 return -ENOTCONN;
460 sin->sin6_port = inet->inet_dport;
461 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
462 if (np->sndflow)
463 sin->sin6_flowinfo = np->flow_label;
464 } else {
465 if (ipv6_addr_any(&np->rcv_saddr))
466 ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
467 else
468 ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
469
470 sin->sin6_port = inet->inet_sport;
471 }
472 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
473 sin->sin6_scope_id = sk->sk_bound_dev_if;
474 *uaddr_len = sizeof(*sin);
475 return 0;
476 }
477
478 EXPORT_SYMBOL(inet6_getname);
479
480 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
481 {
482 struct sock *sk = sock->sk;
483 struct net *net = sock_net(sk);
484
485 switch(cmd)
486 {
487 case SIOCGSTAMP:
488 return sock_get_timestamp(sk, (struct timeval __user *)arg);
489
490 case SIOCGSTAMPNS:
491 return sock_get_timestampns(sk, (struct timespec __user *)arg);
492
493 case SIOCADDRT:
494 case SIOCDELRT:
495
496 return ipv6_route_ioctl(net, cmd, (void __user *)arg);
497
498 case SIOCSIFADDR:
499 return addrconf_add_ifaddr(net, (void __user *) arg);
500 case SIOCDIFADDR:
501 return addrconf_del_ifaddr(net, (void __user *) arg);
502 case SIOCSIFDSTADDR:
503 return addrconf_set_dstaddr(net, (void __user *) arg);
504 default:
505 if (!sk->sk_prot->ioctl)
506 return -ENOIOCTLCMD;
507 return sk->sk_prot->ioctl(sk, cmd, arg);
508 }
509 /*NOTREACHED*/
510 return 0;
511 }
512
513 EXPORT_SYMBOL(inet6_ioctl);
514
515 const struct proto_ops inet6_stream_ops = {
516 .family = PF_INET6,
517 .owner = THIS_MODULE,
518 .release = inet6_release,
519 .bind = inet6_bind,
520 .connect = inet_stream_connect, /* ok */
521 .socketpair = sock_no_socketpair, /* a do nothing */
522 .accept = inet_accept, /* ok */
523 .getname = inet6_getname,
524 .poll = tcp_poll, /* ok */
525 .ioctl = inet6_ioctl, /* must change */
526 .listen = inet_listen, /* ok */
527 .shutdown = inet_shutdown, /* ok */
528 .setsockopt = sock_common_setsockopt, /* ok */
529 .getsockopt = sock_common_getsockopt, /* ok */
530 .sendmsg = inet_sendmsg, /* ok */
531 .recvmsg = inet_recvmsg, /* ok */
532 .mmap = sock_no_mmap,
533 .sendpage = inet_sendpage,
534 .splice_read = tcp_splice_read,
535 #ifdef CONFIG_COMPAT
536 .compat_setsockopt = compat_sock_common_setsockopt,
537 .compat_getsockopt = compat_sock_common_getsockopt,
538 #endif
539 };
540
541 const struct proto_ops inet6_dgram_ops = {
542 .family = PF_INET6,
543 .owner = THIS_MODULE,
544 .release = inet6_release,
545 .bind = inet6_bind,
546 .connect = inet_dgram_connect, /* ok */
547 .socketpair = sock_no_socketpair, /* a do nothing */
548 .accept = sock_no_accept, /* a do nothing */
549 .getname = inet6_getname,
550 .poll = udp_poll, /* ok */
551 .ioctl = inet6_ioctl, /* must change */
552 .listen = sock_no_listen, /* ok */
553 .shutdown = inet_shutdown, /* ok */
554 .setsockopt = sock_common_setsockopt, /* ok */
555 .getsockopt = sock_common_getsockopt, /* ok */
556 .sendmsg = inet_sendmsg, /* ok */
557 .recvmsg = inet_recvmsg, /* ok */
558 .mmap = sock_no_mmap,
559 .sendpage = sock_no_sendpage,
560 #ifdef CONFIG_COMPAT
561 .compat_setsockopt = compat_sock_common_setsockopt,
562 .compat_getsockopt = compat_sock_common_getsockopt,
563 #endif
564 };
565
566 static const struct net_proto_family inet6_family_ops = {
567 .family = PF_INET6,
568 .create = inet6_create,
569 .owner = THIS_MODULE,
570 };
571
572 int inet6_register_protosw(struct inet_protosw *p)
573 {
574 struct list_head *lh;
575 struct inet_protosw *answer;
576 struct list_head *last_perm;
577 int protocol = p->protocol;
578 int ret;
579
580 spin_lock_bh(&inetsw6_lock);
581
582 ret = -EINVAL;
583 if (p->type >= SOCK_MAX)
584 goto out_illegal;
585
586 /* If we are trying to override a permanent protocol, bail. */
587 answer = NULL;
588 ret = -EPERM;
589 last_perm = &inetsw6[p->type];
590 list_for_each(lh, &inetsw6[p->type]) {
591 answer = list_entry(lh, struct inet_protosw, list);
592
593 /* Check only the non-wild match. */
594 if (INET_PROTOSW_PERMANENT & answer->flags) {
595 if (protocol == answer->protocol)
596 break;
597 last_perm = lh;
598 }
599
600 answer = NULL;
601 }
602 if (answer)
603 goto out_permanent;
604
605 /* Add the new entry after the last permanent entry if any, so that
606 * the new entry does not override a permanent entry when matched with
607 * a wild-card protocol. But it is allowed to override any existing
608 * non-permanent entry. This means that when we remove this entry, the
609 * system automatically returns to the old behavior.
610 */
611 list_add_rcu(&p->list, last_perm);
612 ret = 0;
613 out:
614 spin_unlock_bh(&inetsw6_lock);
615 return ret;
616
617 out_permanent:
618 printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
619 protocol);
620 goto out;
621
622 out_illegal:
623 printk(KERN_ERR
624 "Ignoring attempt to register invalid socket type %d.\n",
625 p->type);
626 goto out;
627 }
628
629 EXPORT_SYMBOL(inet6_register_protosw);
630
631 void
632 inet6_unregister_protosw(struct inet_protosw *p)
633 {
634 if (INET_PROTOSW_PERMANENT & p->flags) {
635 printk(KERN_ERR
636 "Attempt to unregister permanent protocol %d.\n",
637 p->protocol);
638 } else {
639 spin_lock_bh(&inetsw6_lock);
640 list_del_rcu(&p->list);
641 spin_unlock_bh(&inetsw6_lock);
642
643 synchronize_net();
644 }
645 }
646
647 EXPORT_SYMBOL(inet6_unregister_protosw);
648
649 int inet6_sk_rebuild_header(struct sock *sk)
650 {
651 struct ipv6_pinfo *np = inet6_sk(sk);
652 struct dst_entry *dst;
653
654 dst = __sk_dst_check(sk, np->dst_cookie);
655
656 if (dst == NULL) {
657 struct inet_sock *inet = inet_sk(sk);
658 struct in6_addr *final_p, final;
659 struct flowi6 fl6;
660
661 memset(&fl6, 0, sizeof(fl6));
662 fl6.flowi6_proto = sk->sk_protocol;
663 ipv6_addr_copy(&fl6.daddr, &np->daddr);
664 ipv6_addr_copy(&fl6.saddr, &np->saddr);
665 fl6.flowlabel = np->flow_label;
666 fl6.flowi6_oif = sk->sk_bound_dev_if;
667 fl6.flowi6_mark = sk->sk_mark;
668 fl6.fl6_dport = inet->inet_dport;
669 fl6.fl6_sport = inet->inet_sport;
670 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
671
672 final_p = fl6_update_dst(&fl6, np->opt, &final);
673
674 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
675 if (IS_ERR(dst)) {
676 sk->sk_route_caps = 0;
677 sk->sk_err_soft = -PTR_ERR(dst);
678 return PTR_ERR(dst);
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 const 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, u32 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 (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 __percpu **)net->mib.udp_stats_in6,
972 sizeof(struct udp_mib),
973 __alignof__(struct udp_mib)) < 0)
974 return -ENOMEM;
975 if (snmp_mib_init((void __percpu **)net->mib.udplite_stats_in6,
976 sizeof(struct udp_mib),
977 __alignof__(struct udp_mib)) < 0)
978 goto err_udplite_mib;
979 if (snmp_mib_init((void __percpu **)net->mib.ipv6_statistics,
980 sizeof(struct ipstats_mib),
981 __alignof__(struct ipstats_mib)) < 0)
982 goto err_ip_mib;
983 if (snmp_mib_init((void __percpu **)net->mib.icmpv6_statistics,
984 sizeof(struct icmpv6_mib),
985 __alignof__(struct icmpv6_mib)) < 0)
986 goto err_icmp_mib;
987 if (snmp_mib_init((void __percpu **)net->mib.icmpv6msg_statistics,
988 sizeof(struct icmpv6msg_mib),
989 __alignof__(struct icmpv6msg_mib)) < 0)
990 goto err_icmpmsg_mib;
991 return 0;
992
993 err_icmpmsg_mib:
994 snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics);
995 err_icmp_mib:
996 snmp_mib_free((void __percpu **)net->mib.ipv6_statistics);
997 err_ip_mib:
998 snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6);
999 err_udplite_mib:
1000 snmp_mib_free((void __percpu **)net->mib.udp_stats_in6);
1001 return -ENOMEM;
1002 }
1003
1004 static void ipv6_cleanup_mibs(struct net *net)
1005 {
1006 snmp_mib_free((void __percpu **)net->mib.udp_stats_in6);
1007 snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6);
1008 snmp_mib_free((void __percpu **)net->mib.ipv6_statistics);
1009 snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics);
1010 snmp_mib_free((void __percpu **)net->mib.icmpv6msg_statistics);
1011 }
1012
1013 static int __net_init inet6_net_init(struct net *net)
1014 {
1015 int err = 0;
1016
1017 net->ipv6.sysctl.bindv6only = 0;
1018 net->ipv6.sysctl.icmpv6_time = 1*HZ;
1019
1020 err = ipv6_init_mibs(net);
1021 if (err)
1022 return err;
1023 #ifdef CONFIG_PROC_FS
1024 err = udp6_proc_init(net);
1025 if (err)
1026 goto out;
1027 err = tcp6_proc_init(net);
1028 if (err)
1029 goto proc_tcp6_fail;
1030 err = ac6_proc_init(net);
1031 if (err)
1032 goto proc_ac6_fail;
1033 #endif
1034 return err;
1035
1036 #ifdef CONFIG_PROC_FS
1037 proc_ac6_fail:
1038 tcp6_proc_exit(net);
1039 proc_tcp6_fail:
1040 udp6_proc_exit(net);
1041 out:
1042 ipv6_cleanup_mibs(net);
1043 return err;
1044 #endif
1045 }
1046
1047 static void __net_exit inet6_net_exit(struct net *net)
1048 {
1049 #ifdef CONFIG_PROC_FS
1050 udp6_proc_exit(net);
1051 tcp6_proc_exit(net);
1052 ac6_proc_exit(net);
1053 #endif
1054 ipv6_cleanup_mibs(net);
1055 }
1056
1057 static struct pernet_operations inet6_net_ops = {
1058 .init = inet6_net_init,
1059 .exit = inet6_net_exit,
1060 };
1061
1062 static int __init inet6_init(void)
1063 {
1064 struct sk_buff *dummy_skb;
1065 struct list_head *r;
1066 int err = 0;
1067
1068 BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
1069
1070 /* Register the socket-side information for inet6_create. */
1071 for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
1072 INIT_LIST_HEAD(r);
1073
1074 if (disable_ipv6_mod) {
1075 printk(KERN_INFO
1076 "IPv6: Loaded, but administratively disabled, "
1077 "reboot required to enable\n");
1078 goto out;
1079 }
1080
1081 err = proto_register(&tcpv6_prot, 1);
1082 if (err)
1083 goto out;
1084
1085 err = proto_register(&udpv6_prot, 1);
1086 if (err)
1087 goto out_unregister_tcp_proto;
1088
1089 err = proto_register(&udplitev6_prot, 1);
1090 if (err)
1091 goto out_unregister_udp_proto;
1092
1093 err = proto_register(&rawv6_prot, 1);
1094 if (err)
1095 goto out_unregister_udplite_proto;
1096
1097
1098 /* We MUST register RAW sockets before we create the ICMP6,
1099 * IGMP6, or NDISC control sockets.
1100 */
1101 err = rawv6_init();
1102 if (err)
1103 goto out_unregister_raw_proto;
1104
1105 /* Register the family here so that the init calls below will
1106 * be able to create sockets. (?? is this dangerous ??)
1107 */
1108 err = sock_register(&inet6_family_ops);
1109 if (err)
1110 goto out_sock_register_fail;
1111
1112 #ifdef CONFIG_SYSCTL
1113 err = ipv6_static_sysctl_register();
1114 if (err)
1115 goto static_sysctl_fail;
1116 #endif
1117 /*
1118 * ipngwg API draft makes clear that the correct semantics
1119 * for TCP and UDP is to consider one TCP and UDP instance
1120 * in a host available by both INET and INET6 APIs and
1121 * able to communicate via both network protocols.
1122 */
1123
1124 err = register_pernet_subsys(&inet6_net_ops);
1125 if (err)
1126 goto register_pernet_fail;
1127 err = icmpv6_init();
1128 if (err)
1129 goto icmp_fail;
1130 err = ip6_mr_init();
1131 if (err)
1132 goto ipmr_fail;
1133 err = ndisc_init();
1134 if (err)
1135 goto ndisc_fail;
1136 err = igmp6_init();
1137 if (err)
1138 goto igmp_fail;
1139 err = ipv6_netfilter_init();
1140 if (err)
1141 goto netfilter_fail;
1142 /* Create /proc/foo6 entries. */
1143 #ifdef CONFIG_PROC_FS
1144 err = -ENOMEM;
1145 if (raw6_proc_init())
1146 goto proc_raw6_fail;
1147 if (udplite6_proc_init())
1148 goto proc_udplite6_fail;
1149 if (ipv6_misc_proc_init())
1150 goto proc_misc6_fail;
1151 if (if6_proc_init())
1152 goto proc_if6_fail;
1153 #endif
1154 err = ip6_route_init();
1155 if (err)
1156 goto ip6_route_fail;
1157 err = ip6_flowlabel_init();
1158 if (err)
1159 goto ip6_flowlabel_fail;
1160 err = addrconf_init();
1161 if (err)
1162 goto addrconf_fail;
1163
1164 /* Init v6 extension headers. */
1165 err = ipv6_exthdrs_init();
1166 if (err)
1167 goto ipv6_exthdrs_fail;
1168
1169 err = ipv6_frag_init();
1170 if (err)
1171 goto ipv6_frag_fail;
1172
1173 /* Init v6 transport protocols. */
1174 err = udpv6_init();
1175 if (err)
1176 goto udpv6_fail;
1177
1178 err = udplitev6_init();
1179 if (err)
1180 goto udplitev6_fail;
1181
1182 err = tcpv6_init();
1183 if (err)
1184 goto tcpv6_fail;
1185
1186 err = ipv6_packet_init();
1187 if (err)
1188 goto ipv6_packet_fail;
1189
1190 #ifdef CONFIG_SYSCTL
1191 err = ipv6_sysctl_register();
1192 if (err)
1193 goto sysctl_fail;
1194 #endif
1195 out:
1196 return err;
1197
1198 #ifdef CONFIG_SYSCTL
1199 sysctl_fail:
1200 ipv6_packet_cleanup();
1201 #endif
1202 ipv6_packet_fail:
1203 tcpv6_exit();
1204 tcpv6_fail:
1205 udplitev6_exit();
1206 udplitev6_fail:
1207 udpv6_exit();
1208 udpv6_fail:
1209 ipv6_frag_exit();
1210 ipv6_frag_fail:
1211 ipv6_exthdrs_exit();
1212 ipv6_exthdrs_fail:
1213 addrconf_cleanup();
1214 addrconf_fail:
1215 ip6_flowlabel_cleanup();
1216 ip6_flowlabel_fail:
1217 ip6_route_cleanup();
1218 ip6_route_fail:
1219 #ifdef CONFIG_PROC_FS
1220 if6_proc_exit();
1221 proc_if6_fail:
1222 ipv6_misc_proc_exit();
1223 proc_misc6_fail:
1224 udplite6_proc_exit();
1225 proc_udplite6_fail:
1226 raw6_proc_exit();
1227 proc_raw6_fail:
1228 #endif
1229 ipv6_netfilter_fini();
1230 netfilter_fail:
1231 igmp6_cleanup();
1232 igmp_fail:
1233 ndisc_cleanup();
1234 ndisc_fail:
1235 ip6_mr_cleanup();
1236 ipmr_fail:
1237 icmpv6_cleanup();
1238 icmp_fail:
1239 unregister_pernet_subsys(&inet6_net_ops);
1240 register_pernet_fail:
1241 #ifdef CONFIG_SYSCTL
1242 ipv6_static_sysctl_unregister();
1243 static_sysctl_fail:
1244 #endif
1245 sock_unregister(PF_INET6);
1246 rtnl_unregister_all(PF_INET6);
1247 out_sock_register_fail:
1248 rawv6_exit();
1249 out_unregister_raw_proto:
1250 proto_unregister(&rawv6_prot);
1251 out_unregister_udplite_proto:
1252 proto_unregister(&udplitev6_prot);
1253 out_unregister_udp_proto:
1254 proto_unregister(&udpv6_prot);
1255 out_unregister_tcp_proto:
1256 proto_unregister(&tcpv6_prot);
1257 goto out;
1258 }
1259 module_init(inet6_init);
1260
1261 static void __exit inet6_exit(void)
1262 {
1263 if (disable_ipv6_mod)
1264 return;
1265
1266 /* First of all disallow new sockets creation. */
1267 sock_unregister(PF_INET6);
1268 /* Disallow any further netlink messages */
1269 rtnl_unregister_all(PF_INET6);
1270
1271 #ifdef CONFIG_SYSCTL
1272 ipv6_sysctl_unregister();
1273 #endif
1274 udpv6_exit();
1275 udplitev6_exit();
1276 tcpv6_exit();
1277
1278 /* Cleanup code parts. */
1279 ipv6_packet_cleanup();
1280 ipv6_frag_exit();
1281 ipv6_exthdrs_exit();
1282 addrconf_cleanup();
1283 ip6_flowlabel_cleanup();
1284 ip6_route_cleanup();
1285 #ifdef CONFIG_PROC_FS
1286
1287 /* Cleanup code parts. */
1288 if6_proc_exit();
1289 ipv6_misc_proc_exit();
1290 udplite6_proc_exit();
1291 raw6_proc_exit();
1292 #endif
1293 ipv6_netfilter_fini();
1294 igmp6_cleanup();
1295 ndisc_cleanup();
1296 ip6_mr_cleanup();
1297 icmpv6_cleanup();
1298 rawv6_exit();
1299
1300 unregister_pernet_subsys(&inet6_net_ops);
1301 #ifdef CONFIG_SYSCTL
1302 ipv6_static_sysctl_unregister();
1303 #endif
1304 proto_unregister(&rawv6_prot);
1305 proto_unregister(&udplitev6_prot);
1306 proto_unregister(&udpv6_prot);
1307 proto_unregister(&tcpv6_prot);
1308
1309 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1310 }
1311 module_exit(inet6_exit);
1312
1313 MODULE_ALIAS_NETPROTO(PF_INET6);
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