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Linux 4.1.16
[linux/fpc-iii.git] / net / ipv6 / af_inet6.c
blobbad62fa5e70fef0bb9c665187a3ab9346e964dc9
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/ping.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 #include <net/ndisc.h>
60 #ifdef CONFIG_IPV6_TUNNEL
61 #include <net/ip6_tunnel.h>
62 #endif
63
64 #include <asm/uaccess.h>
65 #include <linux/mroute6.h>
66
67 MODULE_AUTHOR("Cast of dozens");
68 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
69 MODULE_LICENSE("GPL");
70
71 /* The inetsw6 table contains everything that inet6_create needs to
72 * build a new socket.
73 */
74 static struct list_head inetsw6[SOCK_MAX];
75 static DEFINE_SPINLOCK(inetsw6_lock);
76
77 struct ipv6_params ipv6_defaults = {
78 .disable_ipv6 = 0,
79 .autoconf = 1,
80 };
81
82 static int disable_ipv6_mod;
83
84 module_param_named(disable, disable_ipv6_mod, int, 0444);
85 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
86
87 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
88 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
89
90 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
91 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
92
93 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
94 {
95 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
96
97 return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
98 }
99
100 static int inet6_create(struct net *net, struct socket *sock, int protocol,
101 int kern)
102 {
103 struct inet_sock *inet;
104 struct ipv6_pinfo *np;
105 struct sock *sk;
106 struct inet_protosw *answer;
107 struct proto *answer_prot;
108 unsigned char answer_flags;
109 int try_loading_module = 0;
110 int err;
111
112 if (protocol < 0 || protocol >= IPPROTO_MAX)
113 return -EINVAL;
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 (sock->type == SOCK_RAW && !kern &&
162 !ns_capable(net->user_ns, CAP_NET_RAW))
163 goto out_rcu_unlock;
164
165 sock->ops = answer->ops;
166 answer_prot = answer->prot;
167 answer_flags = answer->flags;
168 rcu_read_unlock();
169
170 WARN_ON(!answer_prot->slab);
171
172 err = -ENOBUFS;
173 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot);
174 if (!sk)
175 goto out;
176
177 sock_init_data(sock, sk);
178
179 err = 0;
180 if (INET_PROTOSW_REUSE & answer_flags)
181 sk->sk_reuse = SK_CAN_REUSE;
182
183 inet = inet_sk(sk);
184 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
185
186 if (SOCK_RAW == sock->type) {
187 inet->inet_num = protocol;
188 if (IPPROTO_RAW == protocol)
189 inet->hdrincl = 1;
190 }
191
192 sk->sk_destruct = inet_sock_destruct;
193 sk->sk_family = PF_INET6;
194 sk->sk_protocol = protocol;
195
196 sk->sk_backlog_rcv = answer->prot->backlog_rcv;
197
198 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
199 np->hop_limit = -1;
200 np->mcast_hops = IPV6_DEFAULT_MCASTHOPS;
201 np->mc_loop = 1;
202 np->pmtudisc = IPV6_PMTUDISC_WANT;
203 sk->sk_ipv6only = net->ipv6.sysctl.bindv6only;
204
205 /* Init the ipv4 part of the socket since we can have sockets
206 * using v6 API for ipv4.
207 */
208 inet->uc_ttl = -1;
209
210 inet->mc_loop = 1;
211 inet->mc_ttl = 1;
212 inet->mc_index = 0;
213 inet->mc_list = NULL;
214 inet->rcv_tos = 0;
215
216 if (net->ipv4.sysctl_ip_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->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->inet_sport = htons(inet->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
274 if (addr->sin6_family != AF_INET6)
275 return -EAFNOSUPPORT;
276
277 addr_type = ipv6_addr_type(&addr->sin6_addr);
278 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
279 return -EINVAL;
280
281 snum = ntohs(addr->sin6_port);
282 if (snum && snum < PROT_SOCK && !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
283 return -EACCES;
284
285 lock_sock(sk);
286
287 /* Check these errors (active socket, double bind). */
288 if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
289 err = -EINVAL;
290 goto out;
291 }
292
293 /* Check if the address belongs to the host. */
294 if (addr_type == IPV6_ADDR_MAPPED) {
295 int chk_addr_ret;
296
297 /* Binding to v4-mapped address on a v6-only socket
298 * makes no sense
299 */
300 if (sk->sk_ipv6only) {
301 err = -EINVAL;
302 goto out;
303 }
304
305 /* Reproduce AF_INET checks to make the bindings consistent */
306 v4addr = addr->sin6_addr.s6_addr32[3];
307 chk_addr_ret = inet_addr_type(net, v4addr);
308 if (!net->ipv4.sysctl_ip_nonlocal_bind &&
309 !(inet->freebind || inet->transparent) &&
310 v4addr != htonl(INADDR_ANY) &&
311 chk_addr_ret != RTN_LOCAL &&
312 chk_addr_ret != RTN_MULTICAST &&
313 chk_addr_ret != RTN_BROADCAST) {
314 err = -EADDRNOTAVAIL;
315 goto out;
316 }
317 } else {
318 if (addr_type != IPV6_ADDR_ANY) {
319 struct net_device *dev = NULL;
320
321 rcu_read_lock();
322 if (__ipv6_addr_needs_scope_id(addr_type)) {
323 if (addr_len >= sizeof(struct sockaddr_in6) &&
324 addr->sin6_scope_id) {
325 /* Override any existing binding, if another one
326 * is supplied by user.
327 */
328 sk->sk_bound_dev_if = addr->sin6_scope_id;
329 }
330
331 /* Binding to link-local address requires an interface */
332 if (!sk->sk_bound_dev_if) {
333 err = -EINVAL;
334 goto out_unlock;
335 }
336 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
337 if (!dev) {
338 err = -ENODEV;
339 goto out_unlock;
340 }
341 }
342
343 /* ipv4 addr of the socket is invalid. Only the
344 * unspecified and mapped address have a v4 equivalent.
345 */
346 v4addr = LOOPBACK4_IPV6;
347 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
348 if (!(inet->freebind || inet->transparent) &&
349 !ipv6_chk_addr(net, &addr->sin6_addr,
350 dev, 0)) {
351 err = -EADDRNOTAVAIL;
352 goto out_unlock;
353 }
354 }
355 rcu_read_unlock();
356 }
357 }
358
359 inet->inet_rcv_saddr = v4addr;
360 inet->inet_saddr = v4addr;
361
362 sk->sk_v6_rcv_saddr = addr->sin6_addr;
363
364 if (!(addr_type & IPV6_ADDR_MULTICAST))
365 np->saddr = addr->sin6_addr;
366
367 /* Make sure we are allowed to bind here. */
368 if (sk->sk_prot->get_port(sk, snum)) {
369 inet_reset_saddr(sk);
370 err = -EADDRINUSE;
371 goto out;
372 }
373
374 if (addr_type != IPV6_ADDR_ANY) {
375 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
376 if (addr_type != IPV6_ADDR_MAPPED)
377 sk->sk_ipv6only = 1;
378 }
379 if (snum)
380 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
381 inet->inet_sport = htons(inet->inet_num);
382 inet->inet_dport = 0;
383 inet->inet_daddr = 0;
384 out:
385 release_sock(sk);
386 return err;
387 out_unlock:
388 rcu_read_unlock();
389 goto out;
390 }
391 EXPORT_SYMBOL(inet6_bind);
392
393 int inet6_release(struct socket *sock)
394 {
395 struct sock *sk = sock->sk;
396
397 if (!sk)
398 return -EINVAL;
399
400 /* Free mc lists */
401 ipv6_sock_mc_close(sk);
402
403 /* Free ac lists */
404 ipv6_sock_ac_close(sk);
405
406 return inet_release(sock);
407 }
408 EXPORT_SYMBOL(inet6_release);
409
410 void inet6_destroy_sock(struct sock *sk)
411 {
412 struct ipv6_pinfo *np = inet6_sk(sk);
413 struct sk_buff *skb;
414 struct ipv6_txoptions *opt;
415
416 /* Release rx options */
417
418 skb = xchg(&np->pktoptions, NULL);
419 if (skb)
420 kfree_skb(skb);
421
422 skb = xchg(&np->rxpmtu, NULL);
423 if (skb)
424 kfree_skb(skb);
425
426 /* Free flowlabels */
427 fl6_free_socklist(sk);
428
429 /* Free tx options */
430
431 opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL);
432 if (opt) {
433 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
434 txopt_put(opt);
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 sin->sin6_addr = sk->sk_v6_daddr;
462 if (np->sndflow)
463 sin->sin6_flowinfo = np->flow_label;
464 } else {
465 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
466 sin->sin6_addr = np->saddr;
467 else
468 sin->sin6_addr = sk->sk_v6_rcv_saddr;
469
470 sin->sin6_port = inet->inet_sport;
471 }
472 sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
473 sk->sk_bound_dev_if);
474 *uaddr_len = sizeof(*sin);
475 return 0;
476 }
477 EXPORT_SYMBOL(inet6_getname);
478
479 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
480 {
481 struct sock *sk = sock->sk;
482 struct net *net = sock_net(sk);
483
484 switch (cmd) {
485 case SIOCGSTAMP:
486 return sock_get_timestamp(sk, (struct timeval __user *)arg);
487
488 case SIOCGSTAMPNS:
489 return sock_get_timestampns(sk, (struct timespec __user *)arg);
490
491 case SIOCADDRT:
492 case SIOCDELRT:
493
494 return ipv6_route_ioctl(net, cmd, (void __user *)arg);
495
496 case SIOCSIFADDR:
497 return addrconf_add_ifaddr(net, (void __user *) arg);
498 case SIOCDIFADDR:
499 return addrconf_del_ifaddr(net, (void __user *) arg);
500 case SIOCSIFDSTADDR:
501 return addrconf_set_dstaddr(net, (void __user *) arg);
502 default:
503 if (!sk->sk_prot->ioctl)
504 return -ENOIOCTLCMD;
505 return sk->sk_prot->ioctl(sk, cmd, arg);
506 }
507 /*NOTREACHED*/
508 return 0;
509 }
510 EXPORT_SYMBOL(inet6_ioctl);
511
512 const struct proto_ops inet6_stream_ops = {
513 .family = PF_INET6,
514 .owner = THIS_MODULE,
515 .release = inet6_release,
516 .bind = inet6_bind,
517 .connect = inet_stream_connect, /* ok */
518 .socketpair = sock_no_socketpair, /* a do nothing */
519 .accept = inet_accept, /* ok */
520 .getname = inet6_getname,
521 .poll = tcp_poll, /* ok */
522 .ioctl = inet6_ioctl, /* must change */
523 .listen = inet_listen, /* ok */
524 .shutdown = inet_shutdown, /* ok */
525 .setsockopt = sock_common_setsockopt, /* ok */
526 .getsockopt = sock_common_getsockopt, /* ok */
527 .sendmsg = inet_sendmsg, /* ok */
528 .recvmsg = inet_recvmsg, /* ok */
529 .mmap = sock_no_mmap,
530 .sendpage = inet_sendpage,
531 .splice_read = tcp_splice_read,
532 #ifdef CONFIG_COMPAT
533 .compat_setsockopt = compat_sock_common_setsockopt,
534 .compat_getsockopt = compat_sock_common_getsockopt,
535 #endif
536 };
537
538 const struct proto_ops inet6_dgram_ops = {
539 .family = PF_INET6,
540 .owner = THIS_MODULE,
541 .release = inet6_release,
542 .bind = inet6_bind,
543 .connect = inet_dgram_connect, /* ok */
544 .socketpair = sock_no_socketpair, /* a do nothing */
545 .accept = sock_no_accept, /* a do nothing */
546 .getname = inet6_getname,
547 .poll = udp_poll, /* ok */
548 .ioctl = inet6_ioctl, /* must change */
549 .listen = sock_no_listen, /* ok */
550 .shutdown = inet_shutdown, /* ok */
551 .setsockopt = sock_common_setsockopt, /* ok */
552 .getsockopt = sock_common_getsockopt, /* ok */
553 .sendmsg = inet_sendmsg, /* ok */
554 .recvmsg = inet_recvmsg, /* ok */
555 .mmap = sock_no_mmap,
556 .sendpage = sock_no_sendpage,
557 #ifdef CONFIG_COMPAT
558 .compat_setsockopt = compat_sock_common_setsockopt,
559 .compat_getsockopt = compat_sock_common_getsockopt,
560 #endif
561 };
562
563 static const struct net_proto_family inet6_family_ops = {
564 .family = PF_INET6,
565 .create = inet6_create,
566 .owner = THIS_MODULE,
567 };
568
569 int inet6_register_protosw(struct inet_protosw *p)
570 {
571 struct list_head *lh;
572 struct inet_protosw *answer;
573 struct list_head *last_perm;
574 int protocol = p->protocol;
575 int ret;
576
577 spin_lock_bh(&inetsw6_lock);
578
579 ret = -EINVAL;
580 if (p->type >= SOCK_MAX)
581 goto out_illegal;
582
583 /* If we are trying to override a permanent protocol, bail. */
584 answer = NULL;
585 ret = -EPERM;
586 last_perm = &inetsw6[p->type];
587 list_for_each(lh, &inetsw6[p->type]) {
588 answer = list_entry(lh, struct inet_protosw, list);
589
590 /* Check only the non-wild match. */
591 if (INET_PROTOSW_PERMANENT & answer->flags) {
592 if (protocol == answer->protocol)
593 break;
594 last_perm = lh;
595 }
596
597 answer = NULL;
598 }
599 if (answer)
600 goto out_permanent;
601
602 /* Add the new entry after the last permanent entry if any, so that
603 * the new entry does not override a permanent entry when matched with
604 * a wild-card protocol. But it is allowed to override any existing
605 * non-permanent entry. This means that when we remove this entry, the
606 * system automatically returns to the old behavior.
607 */
608 list_add_rcu(&p->list, last_perm);
609 ret = 0;
610 out:
611 spin_unlock_bh(&inetsw6_lock);
612 return ret;
613
614 out_permanent:
615 pr_err("Attempt to override permanent protocol %d\n", protocol);
616 goto out;
617
618 out_illegal:
619 pr_err("Ignoring attempt to register invalid socket type %d\n",
620 p->type);
621 goto out;
622 }
623 EXPORT_SYMBOL(inet6_register_protosw);
624
625 void
626 inet6_unregister_protosw(struct inet_protosw *p)
627 {
628 if (INET_PROTOSW_PERMANENT & p->flags) {
629 pr_err("Attempt to unregister permanent protocol %d\n",
630 p->protocol);
631 } else {
632 spin_lock_bh(&inetsw6_lock);
633 list_del_rcu(&p->list);
634 spin_unlock_bh(&inetsw6_lock);
635
636 synchronize_net();
637 }
638 }
639 EXPORT_SYMBOL(inet6_unregister_protosw);
640
641 int inet6_sk_rebuild_header(struct sock *sk)
642 {
643 struct ipv6_pinfo *np = inet6_sk(sk);
644 struct dst_entry *dst;
645
646 dst = __sk_dst_check(sk, np->dst_cookie);
647
648 if (!dst) {
649 struct inet_sock *inet = inet_sk(sk);
650 struct in6_addr *final_p, final;
651 struct flowi6 fl6;
652
653 memset(&fl6, 0, sizeof(fl6));
654 fl6.flowi6_proto = sk->sk_protocol;
655 fl6.daddr = sk->sk_v6_daddr;
656 fl6.saddr = np->saddr;
657 fl6.flowlabel = np->flow_label;
658 fl6.flowi6_oif = sk->sk_bound_dev_if;
659 fl6.flowi6_mark = sk->sk_mark;
660 fl6.fl6_dport = inet->inet_dport;
661 fl6.fl6_sport = inet->inet_sport;
662 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
663
664 rcu_read_lock();
665 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt),
666 &final);
667 rcu_read_unlock();
668
669 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
670 if (IS_ERR(dst)) {
671 sk->sk_route_caps = 0;
672 sk->sk_err_soft = -PTR_ERR(dst);
673 return PTR_ERR(dst);
674 }
675
676 __ip6_dst_store(sk, dst, NULL, NULL);
677 }
678
679 return 0;
680 }
681 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
682
683 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
684 const struct inet6_skb_parm *opt)
685 {
686 const struct ipv6_pinfo *np = inet6_sk(sk);
687
688 if (np->rxopt.all) {
689 if ((opt->hop && (np->rxopt.bits.hopopts ||
690 np->rxopt.bits.ohopopts)) ||
691 (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) &&
692 np->rxopt.bits.rxflow) ||
693 (opt->srcrt && (np->rxopt.bits.srcrt ||
694 np->rxopt.bits.osrcrt)) ||
695 ((opt->dst1 || opt->dst0) &&
696 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
697 return true;
698 }
699 return false;
700 }
701 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
702
703 static struct packet_type ipv6_packet_type __read_mostly = {
704 .type = cpu_to_be16(ETH_P_IPV6),
705 .func = ipv6_rcv,
706 };
707
708 static int __init ipv6_packet_init(void)
709 {
710 dev_add_pack(&ipv6_packet_type);
711 return 0;
712 }
713
714 static void ipv6_packet_cleanup(void)
715 {
716 dev_remove_pack(&ipv6_packet_type);
717 }
718
719 static int __net_init ipv6_init_mibs(struct net *net)
720 {
721 int i;
722
723 net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib);
724 if (!net->mib.udp_stats_in6)
725 return -ENOMEM;
726 net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib);
727 if (!net->mib.udplite_stats_in6)
728 goto err_udplite_mib;
729 net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib);
730 if (!net->mib.ipv6_statistics)
731 goto err_ip_mib;
732
733 for_each_possible_cpu(i) {
734 struct ipstats_mib *af_inet6_stats;
735 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i);
736 u64_stats_init(&af_inet6_stats->syncp);
737 }
738
739
740 net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib);
741 if (!net->mib.icmpv6_statistics)
742 goto err_icmp_mib;
743 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
744 GFP_KERNEL);
745 if (!net->mib.icmpv6msg_statistics)
746 goto err_icmpmsg_mib;
747 return 0;
748
749 err_icmpmsg_mib:
750 free_percpu(net->mib.icmpv6_statistics);
751 err_icmp_mib:
752 free_percpu(net->mib.ipv6_statistics);
753 err_ip_mib:
754 free_percpu(net->mib.udplite_stats_in6);
755 err_udplite_mib:
756 free_percpu(net->mib.udp_stats_in6);
757 return -ENOMEM;
758 }
759
760 static void ipv6_cleanup_mibs(struct net *net)
761 {
762 free_percpu(net->mib.udp_stats_in6);
763 free_percpu(net->mib.udplite_stats_in6);
764 free_percpu(net->mib.ipv6_statistics);
765 free_percpu(net->mib.icmpv6_statistics);
766 kfree(net->mib.icmpv6msg_statistics);
767 }
768
769 static int __net_init inet6_net_init(struct net *net)
770 {
771 int err = 0;
772
773 net->ipv6.sysctl.bindv6only = 0;
774 net->ipv6.sysctl.icmpv6_time = 1*HZ;
775 net->ipv6.sysctl.flowlabel_consistency = 1;
776 net->ipv6.sysctl.auto_flowlabels = 0;
777 net->ipv6.sysctl.idgen_retries = 3;
778 net->ipv6.sysctl.idgen_delay = 1 * HZ;
779 atomic_set(&net->ipv6.fib6_sernum, 1);
780
781 err = ipv6_init_mibs(net);
782 if (err)
783 return err;
784 #ifdef CONFIG_PROC_FS
785 err = udp6_proc_init(net);
786 if (err)
787 goto out;
788 err = tcp6_proc_init(net);
789 if (err)
790 goto proc_tcp6_fail;
791 err = ac6_proc_init(net);
792 if (err)
793 goto proc_ac6_fail;
794 #endif
795 return err;
796
797 #ifdef CONFIG_PROC_FS
798 proc_ac6_fail:
799 tcp6_proc_exit(net);
800 proc_tcp6_fail:
801 udp6_proc_exit(net);
802 out:
803 ipv6_cleanup_mibs(net);
804 return err;
805 #endif
806 }
807
808 static void __net_exit inet6_net_exit(struct net *net)
809 {
810 #ifdef CONFIG_PROC_FS
811 udp6_proc_exit(net);
812 tcp6_proc_exit(net);
813 ac6_proc_exit(net);
814 #endif
815 ipv6_cleanup_mibs(net);
816 }
817
818 static struct pernet_operations inet6_net_ops = {
819 .init = inet6_net_init,
820 .exit = inet6_net_exit,
821 };
822
823 static const struct ipv6_stub ipv6_stub_impl = {
824 .ipv6_sock_mc_join = ipv6_sock_mc_join,
825 .ipv6_sock_mc_drop = ipv6_sock_mc_drop,
826 .ipv6_dst_lookup = ip6_dst_lookup,
827 .udpv6_encap_enable = udpv6_encap_enable,
828 .ndisc_send_na = ndisc_send_na,
829 .nd_tbl = &nd_tbl,
830 };
831
832 static int __init inet6_init(void)
833 {
834 struct list_head *r;
835 int err = 0;
836
837 sock_skb_cb_check_size(sizeof(struct inet6_skb_parm));
838
839 /* Register the socket-side information for inet6_create. */
840 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
841 INIT_LIST_HEAD(r);
842
843 if (disable_ipv6_mod) {
844 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
845 goto out;
846 }
847
848 err = proto_register(&tcpv6_prot, 1);
849 if (err)
850 goto out;
851
852 err = proto_register(&udpv6_prot, 1);
853 if (err)
854 goto out_unregister_tcp_proto;
855
856 err = proto_register(&udplitev6_prot, 1);
857 if (err)
858 goto out_unregister_udp_proto;
859
860 err = proto_register(&rawv6_prot, 1);
861 if (err)
862 goto out_unregister_udplite_proto;
863
864 err = proto_register(&pingv6_prot, 1);
865 if (err)
866 goto out_unregister_ping_proto;
867
868 /* We MUST register RAW sockets before we create the ICMP6,
869 * IGMP6, or NDISC control sockets.
870 */
871 err = rawv6_init();
872 if (err)
873 goto out_unregister_raw_proto;
874
875 /* Register the family here so that the init calls below will
876 * be able to create sockets. (?? is this dangerous ??)
877 */
878 err = sock_register(&inet6_family_ops);
879 if (err)
880 goto out_sock_register_fail;
881
882 /*
883 * ipngwg API draft makes clear that the correct semantics
884 * for TCP and UDP is to consider one TCP and UDP instance
885 * in a host available by both INET and INET6 APIs and
886 * able to communicate via both network protocols.
887 */
888
889 err = register_pernet_subsys(&inet6_net_ops);
890 if (err)
891 goto register_pernet_fail;
892 err = icmpv6_init();
893 if (err)
894 goto icmp_fail;
895 err = ip6_mr_init();
896 if (err)
897 goto ipmr_fail;
898 err = ndisc_init();
899 if (err)
900 goto ndisc_fail;
901 err = igmp6_init();
902 if (err)
903 goto igmp_fail;
904
905 ipv6_stub = &ipv6_stub_impl;
906
907 err = ipv6_netfilter_init();
908 if (err)
909 goto netfilter_fail;
910 /* Create /proc/foo6 entries. */
911 #ifdef CONFIG_PROC_FS
912 err = -ENOMEM;
913 if (raw6_proc_init())
914 goto proc_raw6_fail;
915 if (udplite6_proc_init())
916 goto proc_udplite6_fail;
917 if (ipv6_misc_proc_init())
918 goto proc_misc6_fail;
919 if (if6_proc_init())
920 goto proc_if6_fail;
921 #endif
922 err = ip6_route_init();
923 if (err)
924 goto ip6_route_fail;
925 err = ndisc_late_init();
926 if (err)
927 goto ndisc_late_fail;
928 err = ip6_flowlabel_init();
929 if (err)
930 goto ip6_flowlabel_fail;
931 err = addrconf_init();
932 if (err)
933 goto addrconf_fail;
934
935 /* Init v6 extension headers. */
936 err = ipv6_exthdrs_init();
937 if (err)
938 goto ipv6_exthdrs_fail;
939
940 err = ipv6_frag_init();
941 if (err)
942 goto ipv6_frag_fail;
943
944 /* Init v6 transport protocols. */
945 err = udpv6_init();
946 if (err)
947 goto udpv6_fail;
948
949 err = udplitev6_init();
950 if (err)
951 goto udplitev6_fail;
952
953 err = tcpv6_init();
954 if (err)
955 goto tcpv6_fail;
956
957 err = ipv6_packet_init();
958 if (err)
959 goto ipv6_packet_fail;
960
961 err = pingv6_init();
962 if (err)
963 goto pingv6_fail;
964
965 #ifdef CONFIG_SYSCTL
966 err = ipv6_sysctl_register();
967 if (err)
968 goto sysctl_fail;
969 #endif
970 out:
971 return err;
972
973 #ifdef CONFIG_SYSCTL
974 sysctl_fail:
975 pingv6_exit();
976 #endif
977 pingv6_fail:
978 ipv6_packet_cleanup();
979 ipv6_packet_fail:
980 tcpv6_exit();
981 tcpv6_fail:
982 udplitev6_exit();
983 udplitev6_fail:
984 udpv6_exit();
985 udpv6_fail:
986 ipv6_frag_exit();
987 ipv6_frag_fail:
988 ipv6_exthdrs_exit();
989 ipv6_exthdrs_fail:
990 addrconf_cleanup();
991 addrconf_fail:
992 ip6_flowlabel_cleanup();
993 ip6_flowlabel_fail:
994 ndisc_late_cleanup();
995 ndisc_late_fail:
996 ip6_route_cleanup();
997 ip6_route_fail:
998 #ifdef CONFIG_PROC_FS
999 if6_proc_exit();
1000 proc_if6_fail:
1001 ipv6_misc_proc_exit();
1002 proc_misc6_fail:
1003 udplite6_proc_exit();
1004 proc_udplite6_fail:
1005 raw6_proc_exit();
1006 proc_raw6_fail:
1007 #endif
1008 ipv6_netfilter_fini();
1009 netfilter_fail:
1010 igmp6_cleanup();
1011 igmp_fail:
1012 ndisc_cleanup();
1013 ndisc_fail:
1014 ip6_mr_cleanup();
1015 ipmr_fail:
1016 icmpv6_cleanup();
1017 icmp_fail:
1018 unregister_pernet_subsys(&inet6_net_ops);
1019 register_pernet_fail:
1020 sock_unregister(PF_INET6);
1021 rtnl_unregister_all(PF_INET6);
1022 out_sock_register_fail:
1023 rawv6_exit();
1024 out_unregister_ping_proto:
1025 proto_unregister(&pingv6_prot);
1026 out_unregister_raw_proto:
1027 proto_unregister(&rawv6_prot);
1028 out_unregister_udplite_proto:
1029 proto_unregister(&udplitev6_prot);
1030 out_unregister_udp_proto:
1031 proto_unregister(&udpv6_prot);
1032 out_unregister_tcp_proto:
1033 proto_unregister(&tcpv6_prot);
1034 goto out;
1035 }
1036 module_init(inet6_init);
1037
1038 MODULE_ALIAS_NETPROTO(PF_INET6);
Linux with added FPC-III support