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net: ipv6: Standardize prefixes for message logging
[mirror_ubuntu-artful-kernel.git] / net / ipv6 / af_inet6.c
1 /*
2 * PF_INET6 socket protocol family
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * Adapted from linux/net/ipv4/af_inet.c
9 *
10 * Fixes:
11 * piggy, Karl Knutson : Socket protocol table
12 * Hideaki YOSHIFUJI : sin6_scope_id support
13 * Arnaldo Melo : check proc_net_create return, cleanups
14 *
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License
17 * as published by the Free Software Foundation; either version
18 * 2 of the License, or (at your option) any later version.
19 */
20
21 #define pr_fmt(fmt) "IPv6: " fmt
22
23 #include <linux/module.h>
24 #include <linux/capability.h>
25 #include <linux/errno.h>
26 #include <linux/types.h>
27 #include <linux/socket.h>
28 #include <linux/in.h>
29 #include <linux/kernel.h>
30 #include <linux/timer.h>
31 #include <linux/string.h>
32 #include <linux/sockios.h>
33 #include <linux/net.h>
34 #include <linux/fcntl.h>
35 #include <linux/mm.h>
36 #include <linux/interrupt.h>
37 #include <linux/proc_fs.h>
38 #include <linux/stat.h>
39 #include <linux/init.h>
40 #include <linux/slab.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/route.h>
56 #include <net/transp_v6.h>
57 #include <net/ip6_route.h>
58 #include <net/addrconf.h>
59 #ifdef CONFIG_IPV6_TUNNEL
60 #include <net/ip6_tunnel.h>
61 #endif
62
63 #include <asm/uaccess.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;
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 = SK_CAN_REUSE;
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 inet->rcv_tos = 0;
218
219 if (ipv4_config.no_pmtu_disc)
220 inet->pmtudisc = IP_PMTUDISC_DONT;
221 else
222 inet->pmtudisc = IP_PMTUDISC_WANT;
223 /*
224 * Increment only the relevant sk_prot->socks debug field, this changes
225 * the previous behaviour of incrementing both the equivalent to
226 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
227 *
228 * This allows better debug granularity as we'll know exactly how many
229 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
230 * transport protocol socks. -acme
231 */
232 sk_refcnt_debug_inc(sk);
233
234 if (inet->inet_num) {
235 /* It assumes that any protocol which allows
236 * the user to assign a number at socket
237 * creation time automatically shares.
238 */
239 inet->inet_sport = htons(inet->inet_num);
240 sk->sk_prot->hash(sk);
241 }
242 if (sk->sk_prot->init) {
243 err = sk->sk_prot->init(sk);
244 if (err) {
245 sk_common_release(sk);
246 goto out;
247 }
248 }
249 out:
250 return err;
251 out_rcu_unlock:
252 rcu_read_unlock();
253 goto out;
254 }
255
256
257 /* bind for INET6 API */
258 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
259 {
260 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
261 struct sock *sk = sock->sk;
262 struct inet_sock *inet = inet_sk(sk);
263 struct ipv6_pinfo *np = inet6_sk(sk);
264 struct net *net = sock_net(sk);
265 __be32 v4addr = 0;
266 unsigned short snum;
267 int addr_type = 0;
268 int err = 0;
269
270 /* If the socket has its own bind function then use it. */
271 if (sk->sk_prot->bind)
272 return sk->sk_prot->bind(sk, uaddr, addr_len);
273
274 if (addr_len < SIN6_LEN_RFC2133)
275 return -EINVAL;
276
277 if (addr->sin6_family != AF_INET6)
278 return -EAFNOSUPPORT;
279
280 addr_type = ipv6_addr_type(&addr->sin6_addr);
281 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
282 return -EINVAL;
283
284 snum = ntohs(addr->sin6_port);
285 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
286 return -EACCES;
287
288 lock_sock(sk);
289
290 /* Check these errors (active socket, double bind). */
291 if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
292 err = -EINVAL;
293 goto out;
294 }
295
296 /* Check if the address belongs to the host. */
297 if (addr_type == IPV6_ADDR_MAPPED) {
298 int chk_addr_ret;
299
300 /* Binding to v4-mapped address on a v6-only socket
301 * makes no sense
302 */
303 if (np->ipv6only) {
304 err = -EINVAL;
305 goto out;
306 }
307
308 /* Reproduce AF_INET checks to make the bindings consistent */
309 v4addr = addr->sin6_addr.s6_addr32[3];
310 chk_addr_ret = inet_addr_type(net, v4addr);
311 if (!sysctl_ip_nonlocal_bind &&
312 !(inet->freebind || inet->transparent) &&
313 v4addr != htonl(INADDR_ANY) &&
314 chk_addr_ret != RTN_LOCAL &&
315 chk_addr_ret != RTN_MULTICAST &&
316 chk_addr_ret != RTN_BROADCAST) {
317 err = -EADDRNOTAVAIL;
318 goto out;
319 }
320 } else {
321 if (addr_type != IPV6_ADDR_ANY) {
322 struct net_device *dev = NULL;
323
324 rcu_read_lock();
325 if (addr_type & IPV6_ADDR_LINKLOCAL) {
326 if (addr_len >= sizeof(struct sockaddr_in6) &&
327 addr->sin6_scope_id) {
328 /* Override any existing binding, if another one
329 * is supplied by user.
330 */
331 sk->sk_bound_dev_if = addr->sin6_scope_id;
332 }
333
334 /* Binding to link-local address requires an interface */
335 if (!sk->sk_bound_dev_if) {
336 err = -EINVAL;
337 goto out_unlock;
338 }
339 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
340 if (!dev) {
341 err = -ENODEV;
342 goto out_unlock;
343 }
344 }
345
346 /* ipv4 addr of the socket is invalid. Only the
347 * unspecified and mapped address have a v4 equivalent.
348 */
349 v4addr = LOOPBACK4_IPV6;
350 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
351 if (!(inet->freebind || inet->transparent) &&
352 !ipv6_chk_addr(net, &addr->sin6_addr,
353 dev, 0)) {
354 err = -EADDRNOTAVAIL;
355 goto out_unlock;
356 }
357 }
358 rcu_read_unlock();
359 }
360 }
361
362 inet->inet_rcv_saddr = v4addr;
363 inet->inet_saddr = v4addr;
364
365 np->rcv_saddr = addr->sin6_addr;
366
367 if (!(addr_type & IPV6_ADDR_MULTICAST))
368 np->saddr = addr->sin6_addr;
369
370 /* Make sure we are allowed to bind here. */
371 if (sk->sk_prot->get_port(sk, snum)) {
372 inet_reset_saddr(sk);
373 err = -EADDRINUSE;
374 goto out;
375 }
376
377 if (addr_type != IPV6_ADDR_ANY) {
378 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
379 if (addr_type != IPV6_ADDR_MAPPED)
380 np->ipv6only = 1;
381 }
382 if (snum)
383 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
384 inet->inet_sport = htons(inet->inet_num);
385 inet->inet_dport = 0;
386 inet->inet_daddr = 0;
387 out:
388 release_sock(sk);
389 return err;
390 out_unlock:
391 rcu_read_unlock();
392 goto out;
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 EXPORT_SYMBOL(inet6_release);
412
413 void inet6_destroy_sock(struct sock *sk)
414 {
415 struct ipv6_pinfo *np = inet6_sk(sk);
416 struct sk_buff *skb;
417 struct ipv6_txoptions *opt;
418
419 /* Release rx options */
420
421 skb = xchg(&np->pktoptions, NULL);
422 if (skb != NULL)
423 kfree_skb(skb);
424
425 skb = xchg(&np->rxpmtu, NULL);
426 if (skb != NULL)
427 kfree_skb(skb);
428
429 /* Free flowlabels */
430 fl6_free_socklist(sk);
431
432 /* Free tx options */
433
434 opt = xchg(&np->opt, NULL);
435 if (opt != NULL)
436 sock_kfree_s(sk, opt, opt->tot_len);
437 }
438 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
439
440 /*
441 * This does both peername and sockname.
442 */
443
444 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
445 int *uaddr_len, int peer)
446 {
447 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
448 struct sock *sk = sock->sk;
449 struct inet_sock *inet = inet_sk(sk);
450 struct ipv6_pinfo *np = inet6_sk(sk);
451
452 sin->sin6_family = AF_INET6;
453 sin->sin6_flowinfo = 0;
454 sin->sin6_scope_id = 0;
455 if (peer) {
456 if (!inet->inet_dport)
457 return -ENOTCONN;
458 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
459 peer == 1)
460 return -ENOTCONN;
461 sin->sin6_port = inet->inet_dport;
462 sin->sin6_addr = np->daddr;
463 if (np->sndflow)
464 sin->sin6_flowinfo = np->flow_label;
465 } else {
466 if (ipv6_addr_any(&np->rcv_saddr))
467 sin->sin6_addr = np->saddr;
468 else
469 sin->sin6_addr = np->rcv_saddr;
470
471 sin->sin6_port = inet->inet_sport;
472 }
473 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
474 sin->sin6_scope_id = sk->sk_bound_dev_if;
475 *uaddr_len = sizeof(*sin);
476 return 0;
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 case SIOCGSTAMP:
487 return sock_get_timestamp(sk, (struct timeval __user *)arg);
488
489 case SIOCGSTAMPNS:
490 return sock_get_timestampns(sk, (struct timespec __user *)arg);
491
492 case SIOCADDRT:
493 case SIOCDELRT:
494
495 return ipv6_route_ioctl(net, cmd, (void __user *)arg);
496
497 case SIOCSIFADDR:
498 return addrconf_add_ifaddr(net, (void __user *) arg);
499 case SIOCDIFADDR:
500 return addrconf_del_ifaddr(net, (void __user *) arg);
501 case SIOCSIFDSTADDR:
502 return addrconf_set_dstaddr(net, (void __user *) arg);
503 default:
504 if (!sk->sk_prot->ioctl)
505 return -ENOIOCTLCMD;
506 return sk->sk_prot->ioctl(sk, cmd, arg);
507 }
508 /*NOTREACHED*/
509 return 0;
510 }
511 EXPORT_SYMBOL(inet6_ioctl);
512
513 const struct proto_ops inet6_stream_ops = {
514 .family = PF_INET6,
515 .owner = THIS_MODULE,
516 .release = inet6_release,
517 .bind = inet6_bind,
518 .connect = inet_stream_connect, /* ok */
519 .socketpair = sock_no_socketpair, /* a do nothing */
520 .accept = inet_accept, /* ok */
521 .getname = inet6_getname,
522 .poll = tcp_poll, /* ok */
523 .ioctl = inet6_ioctl, /* must change */
524 .listen = inet_listen, /* ok */
525 .shutdown = inet_shutdown, /* ok */
526 .setsockopt = sock_common_setsockopt, /* ok */
527 .getsockopt = sock_common_getsockopt, /* ok */
528 .sendmsg = inet_sendmsg, /* ok */
529 .recvmsg = inet_recvmsg, /* ok */
530 .mmap = sock_no_mmap,
531 .sendpage = inet_sendpage,
532 .splice_read = tcp_splice_read,
533 #ifdef CONFIG_COMPAT
534 .compat_setsockopt = compat_sock_common_setsockopt,
535 .compat_getsockopt = compat_sock_common_getsockopt,
536 #endif
537 };
538
539 const struct proto_ops inet6_dgram_ops = {
540 .family = PF_INET6,
541 .owner = THIS_MODULE,
542 .release = inet6_release,
543 .bind = inet6_bind,
544 .connect = inet_dgram_connect, /* ok */
545 .socketpair = sock_no_socketpair, /* a do nothing */
546 .accept = sock_no_accept, /* a do nothing */
547 .getname = inet6_getname,
548 .poll = udp_poll, /* ok */
549 .ioctl = inet6_ioctl, /* must change */
550 .listen = sock_no_listen, /* ok */
551 .shutdown = inet_shutdown, /* ok */
552 .setsockopt = sock_common_setsockopt, /* ok */
553 .getsockopt = sock_common_getsockopt, /* ok */
554 .sendmsg = inet_sendmsg, /* ok */
555 .recvmsg = inet_recvmsg, /* ok */
556 .mmap = sock_no_mmap,
557 .sendpage = sock_no_sendpage,
558 #ifdef CONFIG_COMPAT
559 .compat_setsockopt = compat_sock_common_setsockopt,
560 .compat_getsockopt = compat_sock_common_getsockopt,
561 #endif
562 };
563
564 static const struct net_proto_family inet6_family_ops = {
565 .family = PF_INET6,
566 .create = inet6_create,
567 .owner = THIS_MODULE,
568 };
569
570 int inet6_register_protosw(struct inet_protosw *p)
571 {
572 struct list_head *lh;
573 struct inet_protosw *answer;
574 struct list_head *last_perm;
575 int protocol = p->protocol;
576 int ret;
577
578 spin_lock_bh(&inetsw6_lock);
579
580 ret = -EINVAL;
581 if (p->type >= SOCK_MAX)
582 goto out_illegal;
583
584 /* If we are trying to override a permanent protocol, bail. */
585 answer = NULL;
586 ret = -EPERM;
587 last_perm = &inetsw6[p->type];
588 list_for_each(lh, &inetsw6[p->type]) {
589 answer = list_entry(lh, struct inet_protosw, list);
590
591 /* Check only the non-wild match. */
592 if (INET_PROTOSW_PERMANENT & answer->flags) {
593 if (protocol == answer->protocol)
594 break;
595 last_perm = lh;
596 }
597
598 answer = NULL;
599 }
600 if (answer)
601 goto out_permanent;
602
603 /* Add the new entry after the last permanent entry if any, so that
604 * the new entry does not override a permanent entry when matched with
605 * a wild-card protocol. But it is allowed to override any existing
606 * non-permanent entry. This means that when we remove this entry, the
607 * system automatically returns to the old behavior.
608 */
609 list_add_rcu(&p->list, last_perm);
610 ret = 0;
611 out:
612 spin_unlock_bh(&inetsw6_lock);
613 return ret;
614
615 out_permanent:
616 pr_err("Attempt to override permanent protocol %d\n", protocol);
617 goto out;
618
619 out_illegal:
620 pr_err("Ignoring attempt to register invalid socket type %d\n",
621 p->type);
622 goto out;
623 }
624 EXPORT_SYMBOL(inet6_register_protosw);
625
626 void
627 inet6_unregister_protosw(struct inet_protosw *p)
628 {
629 if (INET_PROTOSW_PERMANENT & p->flags) {
630 pr_err("Attempt to unregister permanent protocol %d\n",
631 p->protocol);
632 } else {
633 spin_lock_bh(&inetsw6_lock);
634 list_del_rcu(&p->list);
635 spin_unlock_bh(&inetsw6_lock);
636
637 synchronize_net();
638 }
639 }
640 EXPORT_SYMBOL(inet6_unregister_protosw);
641
642 int inet6_sk_rebuild_header(struct sock *sk)
643 {
644 struct ipv6_pinfo *np = inet6_sk(sk);
645 struct dst_entry *dst;
646
647 dst = __sk_dst_check(sk, np->dst_cookie);
648
649 if (dst == NULL) {
650 struct inet_sock *inet = inet_sk(sk);
651 struct in6_addr *final_p, final;
652 struct flowi6 fl6;
653
654 memset(&fl6, 0, sizeof(fl6));
655 fl6.flowi6_proto = sk->sk_protocol;
656 fl6.daddr = np->daddr;
657 fl6.saddr = np->saddr;
658 fl6.flowlabel = np->flow_label;
659 fl6.flowi6_oif = sk->sk_bound_dev_if;
660 fl6.flowi6_mark = sk->sk_mark;
661 fl6.fl6_dport = inet->inet_dport;
662 fl6.fl6_sport = inet->inet_sport;
663 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
664
665 final_p = fl6_update_dst(&fl6, np->opt, &final);
666
667 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
668 if (IS_ERR(dst)) {
669 sk->sk_route_caps = 0;
670 sk->sk_err_soft = -PTR_ERR(dst);
671 return PTR_ERR(dst);
672 }
673
674 __ip6_dst_store(sk, dst, NULL, NULL);
675 }
676
677 return 0;
678 }
679 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
680
681 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
682 {
683 struct ipv6_pinfo *np = inet6_sk(sk);
684 struct inet6_skb_parm *opt = IP6CB(skb);
685
686 if (np->rxopt.all) {
687 if ((opt->hop && (np->rxopt.bits.hopopts ||
688 np->rxopt.bits.ohopopts)) ||
689 ((IPV6_FLOWINFO_MASK &
690 *(__be32 *)skb_network_header(skb)) &&
691 np->rxopt.bits.rxflow) ||
692 (opt->srcrt && (np->rxopt.bits.srcrt ||
693 np->rxopt.bits.osrcrt)) ||
694 ((opt->dst1 || opt->dst0) &&
695 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
696 return 1;
697 }
698 return 0;
699 }
700 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
701
702 static int ipv6_gso_pull_exthdrs(struct sk_buff *skb, int proto)
703 {
704 const struct inet6_protocol *ops = NULL;
705
706 for (;;) {
707 struct ipv6_opt_hdr *opth;
708 int len;
709
710 if (proto != NEXTHDR_HOP) {
711 ops = rcu_dereference(inet6_protos[proto]);
712
713 if (unlikely(!ops))
714 break;
715
716 if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
717 break;
718 }
719
720 if (unlikely(!pskb_may_pull(skb, 8)))
721 break;
722
723 opth = (void *)skb->data;
724 len = ipv6_optlen(opth);
725
726 if (unlikely(!pskb_may_pull(skb, len)))
727 break;
728
729 proto = opth->nexthdr;
730 __skb_pull(skb, len);
731 }
732
733 return proto;
734 }
735
736 static int ipv6_gso_send_check(struct sk_buff *skb)
737 {
738 const struct ipv6hdr *ipv6h;
739 const struct inet6_protocol *ops;
740 int err = -EINVAL;
741
742 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
743 goto out;
744
745 ipv6h = ipv6_hdr(skb);
746 __skb_pull(skb, sizeof(*ipv6h));
747 err = -EPROTONOSUPPORT;
748
749 rcu_read_lock();
750 ops = rcu_dereference(inet6_protos[
751 ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]);
752
753 if (likely(ops && ops->gso_send_check)) {
754 skb_reset_transport_header(skb);
755 err = ops->gso_send_check(skb);
756 }
757 rcu_read_unlock();
758
759 out:
760 return err;
761 }
762
763 static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb,
764 netdev_features_t features)
765 {
766 struct sk_buff *segs = ERR_PTR(-EINVAL);
767 struct ipv6hdr *ipv6h;
768 const struct inet6_protocol *ops;
769 int proto;
770 struct frag_hdr *fptr;
771 unsigned int unfrag_ip6hlen;
772 u8 *prevhdr;
773 int offset = 0;
774
775 if (!(features & NETIF_F_V6_CSUM))
776 features &= ~NETIF_F_SG;
777
778 if (unlikely(skb_shinfo(skb)->gso_type &
779 ~(SKB_GSO_UDP |
780 SKB_GSO_DODGY |
781 SKB_GSO_TCP_ECN |
782 SKB_GSO_TCPV6 |
783 0)))
784 goto out;
785
786 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
787 goto out;
788
789 ipv6h = ipv6_hdr(skb);
790 __skb_pull(skb, sizeof(*ipv6h));
791 segs = ERR_PTR(-EPROTONOSUPPORT);
792
793 proto = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
794 rcu_read_lock();
795 ops = rcu_dereference(inet6_protos[proto]);
796 if (likely(ops && ops->gso_segment)) {
797 skb_reset_transport_header(skb);
798 segs = ops->gso_segment(skb, features);
799 }
800 rcu_read_unlock();
801
802 if (IS_ERR(segs))
803 goto out;
804
805 for (skb = segs; skb; skb = skb->next) {
806 ipv6h = ipv6_hdr(skb);
807 ipv6h->payload_len = htons(skb->len - skb->mac_len -
808 sizeof(*ipv6h));
809 if (proto == IPPROTO_UDP) {
810 unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
811 fptr = (struct frag_hdr *)(skb_network_header(skb) +
812 unfrag_ip6hlen);
813 fptr->frag_off = htons(offset);
814 if (skb->next != NULL)
815 fptr->frag_off |= htons(IP6_MF);
816 offset += (ntohs(ipv6h->payload_len) -
817 sizeof(struct frag_hdr));
818 }
819 }
820
821 out:
822 return segs;
823 }
824
825 struct ipv6_gro_cb {
826 struct napi_gro_cb napi;
827 int proto;
828 };
829
830 #define IPV6_GRO_CB(skb) ((struct ipv6_gro_cb *)(skb)->cb)
831
832 static struct sk_buff **ipv6_gro_receive(struct sk_buff **head,
833 struct sk_buff *skb)
834 {
835 const struct inet6_protocol *ops;
836 struct sk_buff **pp = NULL;
837 struct sk_buff *p;
838 struct ipv6hdr *iph;
839 unsigned int nlen;
840 unsigned int hlen;
841 unsigned int off;
842 int flush = 1;
843 int proto;
844 __wsum csum;
845
846 off = skb_gro_offset(skb);
847 hlen = off + sizeof(*iph);
848 iph = skb_gro_header_fast(skb, off);
849 if (skb_gro_header_hard(skb, hlen)) {
850 iph = skb_gro_header_slow(skb, hlen, off);
851 if (unlikely(!iph))
852 goto out;
853 }
854
855 skb_gro_pull(skb, sizeof(*iph));
856 skb_set_transport_header(skb, skb_gro_offset(skb));
857
858 flush += ntohs(iph->payload_len) != skb_gro_len(skb);
859
860 rcu_read_lock();
861 proto = iph->nexthdr;
862 ops = rcu_dereference(inet6_protos[proto]);
863 if (!ops || !ops->gro_receive) {
864 __pskb_pull(skb, skb_gro_offset(skb));
865 proto = ipv6_gso_pull_exthdrs(skb, proto);
866 skb_gro_pull(skb, -skb_transport_offset(skb));
867 skb_reset_transport_header(skb);
868 __skb_push(skb, skb_gro_offset(skb));
869
870 ops = rcu_dereference(inet6_protos[proto]);
871 if (!ops || !ops->gro_receive)
872 goto out_unlock;
873
874 iph = ipv6_hdr(skb);
875 }
876
877 IPV6_GRO_CB(skb)->proto = proto;
878
879 flush--;
880 nlen = skb_network_header_len(skb);
881
882 for (p = *head; p; p = p->next) {
883 struct ipv6hdr *iph2;
884
885 if (!NAPI_GRO_CB(p)->same_flow)
886 continue;
887
888 iph2 = ipv6_hdr(p);
889
890 /* All fields must match except length. */
891 if (nlen != skb_network_header_len(p) ||
892 memcmp(iph, iph2, offsetof(struct ipv6hdr, payload_len)) ||
893 memcmp(&iph->nexthdr, &iph2->nexthdr,
894 nlen - offsetof(struct ipv6hdr, nexthdr))) {
895 NAPI_GRO_CB(p)->same_flow = 0;
896 continue;
897 }
898
899 NAPI_GRO_CB(p)->flush |= flush;
900 }
901
902 NAPI_GRO_CB(skb)->flush |= flush;
903
904 csum = skb->csum;
905 skb_postpull_rcsum(skb, iph, skb_network_header_len(skb));
906
907 pp = ops->gro_receive(head, skb);
908
909 skb->csum = csum;
910
911 out_unlock:
912 rcu_read_unlock();
913
914 out:
915 NAPI_GRO_CB(skb)->flush |= flush;
916
917 return pp;
918 }
919
920 static int ipv6_gro_complete(struct sk_buff *skb)
921 {
922 const struct inet6_protocol *ops;
923 struct ipv6hdr *iph = ipv6_hdr(skb);
924 int err = -ENOSYS;
925
926 iph->payload_len = htons(skb->len - skb_network_offset(skb) -
927 sizeof(*iph));
928
929 rcu_read_lock();
930 ops = rcu_dereference(inet6_protos[IPV6_GRO_CB(skb)->proto]);
931 if (WARN_ON(!ops || !ops->gro_complete))
932 goto out_unlock;
933
934 err = ops->gro_complete(skb);
935
936 out_unlock:
937 rcu_read_unlock();
938
939 return err;
940 }
941
942 static struct packet_type ipv6_packet_type __read_mostly = {
943 .type = cpu_to_be16(ETH_P_IPV6),
944 .func = ipv6_rcv,
945 .gso_send_check = ipv6_gso_send_check,
946 .gso_segment = ipv6_gso_segment,
947 .gro_receive = ipv6_gro_receive,
948 .gro_complete = ipv6_gro_complete,
949 };
950
951 static int __init ipv6_packet_init(void)
952 {
953 dev_add_pack(&ipv6_packet_type);
954 return 0;
955 }
956
957 static void ipv6_packet_cleanup(void)
958 {
959 dev_remove_pack(&ipv6_packet_type);
960 }
961
962 static int __net_init ipv6_init_mibs(struct net *net)
963 {
964 if (snmp_mib_init((void __percpu **)net->mib.udp_stats_in6,
965 sizeof(struct udp_mib),
966 __alignof__(struct udp_mib)) < 0)
967 return -ENOMEM;
968 if (snmp_mib_init((void __percpu **)net->mib.udplite_stats_in6,
969 sizeof(struct udp_mib),
970 __alignof__(struct udp_mib)) < 0)
971 goto err_udplite_mib;
972 if (snmp_mib_init((void __percpu **)net->mib.ipv6_statistics,
973 sizeof(struct ipstats_mib),
974 __alignof__(struct ipstats_mib)) < 0)
975 goto err_ip_mib;
976 if (snmp_mib_init((void __percpu **)net->mib.icmpv6_statistics,
977 sizeof(struct icmpv6_mib),
978 __alignof__(struct icmpv6_mib)) < 0)
979 goto err_icmp_mib;
980 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
981 GFP_KERNEL);
982 if (!net->mib.icmpv6msg_statistics)
983 goto err_icmpmsg_mib;
984 return 0;
985
986 err_icmpmsg_mib:
987 snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics);
988 err_icmp_mib:
989 snmp_mib_free((void __percpu **)net->mib.ipv6_statistics);
990 err_ip_mib:
991 snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6);
992 err_udplite_mib:
993 snmp_mib_free((void __percpu **)net->mib.udp_stats_in6);
994 return -ENOMEM;
995 }
996
997 static void ipv6_cleanup_mibs(struct net *net)
998 {
999 snmp_mib_free((void __percpu **)net->mib.udp_stats_in6);
1000 snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6);
1001 snmp_mib_free((void __percpu **)net->mib.ipv6_statistics);
1002 snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics);
1003 kfree(net->mib.icmpv6msg_statistics);
1004 }
1005
1006 static int __net_init inet6_net_init(struct net *net)
1007 {
1008 int err = 0;
1009
1010 net->ipv6.sysctl.bindv6only = 0;
1011 net->ipv6.sysctl.icmpv6_time = 1*HZ;
1012
1013 err = ipv6_init_mibs(net);
1014 if (err)
1015 return err;
1016 #ifdef CONFIG_PROC_FS
1017 err = udp6_proc_init(net);
1018 if (err)
1019 goto out;
1020 err = tcp6_proc_init(net);
1021 if (err)
1022 goto proc_tcp6_fail;
1023 err = ac6_proc_init(net);
1024 if (err)
1025 goto proc_ac6_fail;
1026 #endif
1027 return err;
1028
1029 #ifdef CONFIG_PROC_FS
1030 proc_ac6_fail:
1031 tcp6_proc_exit(net);
1032 proc_tcp6_fail:
1033 udp6_proc_exit(net);
1034 out:
1035 ipv6_cleanup_mibs(net);
1036 return err;
1037 #endif
1038 }
1039
1040 static void __net_exit inet6_net_exit(struct net *net)
1041 {
1042 #ifdef CONFIG_PROC_FS
1043 udp6_proc_exit(net);
1044 tcp6_proc_exit(net);
1045 ac6_proc_exit(net);
1046 #endif
1047 ipv6_cleanup_mibs(net);
1048 }
1049
1050 static struct pernet_operations inet6_net_ops = {
1051 .init = inet6_net_init,
1052 .exit = inet6_net_exit,
1053 };
1054
1055 static int __init inet6_init(void)
1056 {
1057 struct sk_buff *dummy_skb;
1058 struct list_head *r;
1059 int err = 0;
1060
1061 BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
1062
1063 /* Register the socket-side information for inet6_create. */
1064 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
1065 INIT_LIST_HEAD(r);
1066
1067 if (disable_ipv6_mod) {
1068 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
1069 goto out;
1070 }
1071
1072 err = proto_register(&tcpv6_prot, 1);
1073 if (err)
1074 goto out;
1075
1076 err = proto_register(&udpv6_prot, 1);
1077 if (err)
1078 goto out_unregister_tcp_proto;
1079
1080 err = proto_register(&udplitev6_prot, 1);
1081 if (err)
1082 goto out_unregister_udp_proto;
1083
1084 err = proto_register(&rawv6_prot, 1);
1085 if (err)
1086 goto out_unregister_udplite_proto;
1087
1088
1089 /* We MUST register RAW sockets before we create the ICMP6,
1090 * IGMP6, or NDISC control sockets.
1091 */
1092 err = rawv6_init();
1093 if (err)
1094 goto out_unregister_raw_proto;
1095
1096 /* Register the family here so that the init calls below will
1097 * be able to create sockets. (?? is this dangerous ??)
1098 */
1099 err = sock_register(&inet6_family_ops);
1100 if (err)
1101 goto out_sock_register_fail;
1102
1103 tcpv6_prot.sysctl_mem = init_net.ipv4.sysctl_tcp_mem;
1104
1105 /*
1106 * ipngwg API draft makes clear that the correct semantics
1107 * for TCP and UDP is to consider one TCP and UDP instance
1108 * in a host available by both INET and INET6 APIs and
1109 * able to communicate via both network protocols.
1110 */
1111
1112 err = register_pernet_subsys(&inet6_net_ops);
1113 if (err)
1114 goto register_pernet_fail;
1115 err = icmpv6_init();
1116 if (err)
1117 goto icmp_fail;
1118 err = ip6_mr_init();
1119 if (err)
1120 goto ipmr_fail;
1121 err = ndisc_init();
1122 if (err)
1123 goto ndisc_fail;
1124 err = igmp6_init();
1125 if (err)
1126 goto igmp_fail;
1127 err = ipv6_netfilter_init();
1128 if (err)
1129 goto netfilter_fail;
1130 /* Create /proc/foo6 entries. */
1131 #ifdef CONFIG_PROC_FS
1132 err = -ENOMEM;
1133 if (raw6_proc_init())
1134 goto proc_raw6_fail;
1135 if (udplite6_proc_init())
1136 goto proc_udplite6_fail;
1137 if (ipv6_misc_proc_init())
1138 goto proc_misc6_fail;
1139 if (if6_proc_init())
1140 goto proc_if6_fail;
1141 #endif
1142 err = ip6_route_init();
1143 if (err)
1144 goto ip6_route_fail;
1145 err = ip6_flowlabel_init();
1146 if (err)
1147 goto ip6_flowlabel_fail;
1148 err = addrconf_init();
1149 if (err)
1150 goto addrconf_fail;
1151
1152 /* Init v6 extension headers. */
1153 err = ipv6_exthdrs_init();
1154 if (err)
1155 goto ipv6_exthdrs_fail;
1156
1157 err = ipv6_frag_init();
1158 if (err)
1159 goto ipv6_frag_fail;
1160
1161 /* Init v6 transport protocols. */
1162 err = udpv6_init();
1163 if (err)
1164 goto udpv6_fail;
1165
1166 err = udplitev6_init();
1167 if (err)
1168 goto udplitev6_fail;
1169
1170 err = tcpv6_init();
1171 if (err)
1172 goto tcpv6_fail;
1173
1174 err = ipv6_packet_init();
1175 if (err)
1176 goto ipv6_packet_fail;
1177
1178 #ifdef CONFIG_SYSCTL
1179 err = ipv6_sysctl_register();
1180 if (err)
1181 goto sysctl_fail;
1182 #endif
1183 out:
1184 return err;
1185
1186 #ifdef CONFIG_SYSCTL
1187 sysctl_fail:
1188 ipv6_packet_cleanup();
1189 #endif
1190 ipv6_packet_fail:
1191 tcpv6_exit();
1192 tcpv6_fail:
1193 udplitev6_exit();
1194 udplitev6_fail:
1195 udpv6_exit();
1196 udpv6_fail:
1197 ipv6_frag_exit();
1198 ipv6_frag_fail:
1199 ipv6_exthdrs_exit();
1200 ipv6_exthdrs_fail:
1201 addrconf_cleanup();
1202 addrconf_fail:
1203 ip6_flowlabel_cleanup();
1204 ip6_flowlabel_fail:
1205 ip6_route_cleanup();
1206 ip6_route_fail:
1207 #ifdef CONFIG_PROC_FS
1208 if6_proc_exit();
1209 proc_if6_fail:
1210 ipv6_misc_proc_exit();
1211 proc_misc6_fail:
1212 udplite6_proc_exit();
1213 proc_udplite6_fail:
1214 raw6_proc_exit();
1215 proc_raw6_fail:
1216 #endif
1217 ipv6_netfilter_fini();
1218 netfilter_fail:
1219 igmp6_cleanup();
1220 igmp_fail:
1221 ndisc_cleanup();
1222 ndisc_fail:
1223 ip6_mr_cleanup();
1224 ipmr_fail:
1225 icmpv6_cleanup();
1226 icmp_fail:
1227 unregister_pernet_subsys(&inet6_net_ops);
1228 register_pernet_fail:
1229 sock_unregister(PF_INET6);
1230 rtnl_unregister_all(PF_INET6);
1231 out_sock_register_fail:
1232 rawv6_exit();
1233 out_unregister_raw_proto:
1234 proto_unregister(&rawv6_prot);
1235 out_unregister_udplite_proto:
1236 proto_unregister(&udplitev6_prot);
1237 out_unregister_udp_proto:
1238 proto_unregister(&udpv6_prot);
1239 out_unregister_tcp_proto:
1240 proto_unregister(&tcpv6_prot);
1241 goto out;
1242 }
1243 module_init(inet6_init);
1244
1245 static void __exit inet6_exit(void)
1246 {
1247 if (disable_ipv6_mod)
1248 return;
1249
1250 /* First of all disallow new sockets creation. */
1251 sock_unregister(PF_INET6);
1252 /* Disallow any further netlink messages */
1253 rtnl_unregister_all(PF_INET6);
1254
1255 udpv6_exit();
1256 udplitev6_exit();
1257 tcpv6_exit();
1258
1259 /* Cleanup code parts. */
1260 ipv6_packet_cleanup();
1261 ipv6_frag_exit();
1262 ipv6_exthdrs_exit();
1263 addrconf_cleanup();
1264 ip6_flowlabel_cleanup();
1265 ip6_route_cleanup();
1266 #ifdef CONFIG_PROC_FS
1267
1268 /* Cleanup code parts. */
1269 if6_proc_exit();
1270 ipv6_misc_proc_exit();
1271 udplite6_proc_exit();
1272 raw6_proc_exit();
1273 #endif
1274 ipv6_netfilter_fini();
1275 igmp6_cleanup();
1276 ndisc_cleanup();
1277 ip6_mr_cleanup();
1278 icmpv6_cleanup();
1279 rawv6_exit();
1280
1281 unregister_pernet_subsys(&inet6_net_ops);
1282 proto_unregister(&rawv6_prot);
1283 proto_unregister(&udplitev6_prot);
1284 proto_unregister(&udpv6_prot);
1285 proto_unregister(&tcpv6_prot);
1286
1287 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1288 }
1289 module_exit(inet6_exit);
1290
1291 MODULE_ALIAS_NETPROTO(PF_INET6);
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