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Merge 4.4.76 into android-4.4
[sagit-ice-cold/kernel_xiaomi_msm8998.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/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 #ifdef CONFIG_ANDROID_PARANOID_NETWORK
68 #include <linux/android_aid.h>
69
70 static inline int current_has_network(void)
71 {
72         return in_egroup_p(AID_INET) || capable(CAP_NET_RAW);
73 }
74 #else
75 static inline int current_has_network(void)
76 {
77         return 1;
78 }
79 #endif
80
81 MODULE_AUTHOR("Cast of dozens");
82 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
83 MODULE_LICENSE("GPL");
84
85 /* The inetsw6 table contains everything that inet6_create needs to
86  * build a new socket.
87  */
88 static struct list_head inetsw6[SOCK_MAX];
89 static DEFINE_SPINLOCK(inetsw6_lock);
90
91 struct ipv6_params ipv6_defaults = {
92         .disable_ipv6 = 0,
93         .autoconf = 1,
94 };
95
96 static int disable_ipv6_mod;
97
98 module_param_named(disable, disable_ipv6_mod, int, 0444);
99 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
100
101 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
102 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
103
104 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
105 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
106
107 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
108 {
109         const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
110
111         return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
112 }
113
114 static int inet6_create(struct net *net, struct socket *sock, int protocol,
115                         int kern)
116 {
117         struct inet_sock *inet;
118         struct ipv6_pinfo *np;
119         struct sock *sk;
120         struct inet_protosw *answer;
121         struct proto *answer_prot;
122         unsigned char answer_flags;
123         int try_loading_module = 0;
124         int err;
125
126         if (protocol < 0 || protocol >= IPPROTO_MAX)
127                 return -EINVAL;
128
129         if (!current_has_network())
130                 return -EACCES;
131
132         /* Look for the requested type/protocol pair. */
133 lookup_protocol:
134         err = -ESOCKTNOSUPPORT;
135         rcu_read_lock();
136         list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
137
138                 err = 0;
139                 /* Check the non-wild match. */
140                 if (protocol == answer->protocol) {
141                         if (protocol != IPPROTO_IP)
142                                 break;
143                 } else {
144                         /* Check for the two wild cases. */
145                         if (IPPROTO_IP == protocol) {
146                                 protocol = answer->protocol;
147                                 break;
148                         }
149                         if (IPPROTO_IP == answer->protocol)
150                                 break;
151                 }
152                 err = -EPROTONOSUPPORT;
153         }
154
155         if (err) {
156                 if (try_loading_module < 2) {
157                         rcu_read_unlock();
158                         /*
159                          * Be more specific, e.g. net-pf-10-proto-132-type-1
160                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
161                          */
162                         if (++try_loading_module == 1)
163                                 request_module("net-pf-%d-proto-%d-type-%d",
164                                                 PF_INET6, protocol, sock->type);
165                         /*
166                          * Fall back to generic, e.g. net-pf-10-proto-132
167                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
168                          */
169                         else
170                                 request_module("net-pf-%d-proto-%d",
171                                                 PF_INET6, protocol);
172                         goto lookup_protocol;
173                 } else
174                         goto out_rcu_unlock;
175         }
176
177         err = -EPERM;
178         if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
179                 goto out_rcu_unlock;
180
181         sock->ops = answer->ops;
182         answer_prot = answer->prot;
183         answer_flags = answer->flags;
184         rcu_read_unlock();
185
186         WARN_ON(!answer_prot->slab);
187
188         err = -ENOBUFS;
189         sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern);
190         if (!sk)
191                 goto out;
192
193         sock_init_data(sock, sk);
194
195         err = 0;
196         if (INET_PROTOSW_REUSE & answer_flags)
197                 sk->sk_reuse = SK_CAN_REUSE;
198
199         inet = inet_sk(sk);
200         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
201
202         if (SOCK_RAW == sock->type) {
203                 inet->inet_num = protocol;
204                 if (IPPROTO_RAW == protocol)
205                         inet->hdrincl = 1;
206         }
207
208         sk->sk_destruct         = inet_sock_destruct;
209         sk->sk_family           = PF_INET6;
210         sk->sk_protocol         = protocol;
211
212         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
213
214         inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
215         np->hop_limit   = -1;
216         np->mcast_hops  = IPV6_DEFAULT_MCASTHOPS;
217         np->mc_loop     = 1;
218         np->pmtudisc    = IPV6_PMTUDISC_WANT;
219         np->autoflowlabel = ip6_default_np_autolabel(sock_net(sk));
220         sk->sk_ipv6only = net->ipv6.sysctl.bindv6only;
221
222         /* Init the ipv4 part of the socket since we can have sockets
223          * using v6 API for ipv4.
224          */
225         inet->uc_ttl    = -1;
226
227         inet->mc_loop   = 1;
228         inet->mc_ttl    = 1;
229         inet->mc_index  = 0;
230         inet->mc_list   = NULL;
231         inet->rcv_tos   = 0;
232
233         if (net->ipv4.sysctl_ip_no_pmtu_disc)
234                 inet->pmtudisc = IP_PMTUDISC_DONT;
235         else
236                 inet->pmtudisc = IP_PMTUDISC_WANT;
237         /*
238          * Increment only the relevant sk_prot->socks debug field, this changes
239          * the previous behaviour of incrementing both the equivalent to
240          * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
241          *
242          * This allows better debug granularity as we'll know exactly how many
243          * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
244          * transport protocol socks. -acme
245          */
246         sk_refcnt_debug_inc(sk);
247
248         if (inet->inet_num) {
249                 /* It assumes that any protocol which allows
250                  * the user to assign a number at socket
251                  * creation time automatically shares.
252                  */
253                 inet->inet_sport = htons(inet->inet_num);
254                 sk->sk_prot->hash(sk);
255         }
256         if (sk->sk_prot->init) {
257                 err = sk->sk_prot->init(sk);
258                 if (err) {
259                         sk_common_release(sk);
260                         goto out;
261                 }
262         }
263 out:
264         return err;
265 out_rcu_unlock:
266         rcu_read_unlock();
267         goto out;
268 }
269
270
271 /* bind for INET6 API */
272 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
273 {
274         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
275         struct sock *sk = sock->sk;
276         struct inet_sock *inet = inet_sk(sk);
277         struct ipv6_pinfo *np = inet6_sk(sk);
278         struct net *net = sock_net(sk);
279         __be32 v4addr = 0;
280         unsigned short snum;
281         int addr_type = 0;
282         int err = 0;
283
284         /* If the socket has its own bind function then use it. */
285         if (sk->sk_prot->bind)
286                 return sk->sk_prot->bind(sk, uaddr, addr_len);
287
288         if (addr_len < SIN6_LEN_RFC2133)
289                 return -EINVAL;
290
291         if (addr->sin6_family != AF_INET6)
292                 return -EAFNOSUPPORT;
293
294         addr_type = ipv6_addr_type(&addr->sin6_addr);
295         if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
296                 return -EINVAL;
297
298         snum = ntohs(addr->sin6_port);
299         if (snum && snum < PROT_SOCK && !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
300                 return -EACCES;
301
302         lock_sock(sk);
303
304         /* Check these errors (active socket, double bind). */
305         if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
306                 err = -EINVAL;
307                 goto out;
308         }
309
310         /* Check if the address belongs to the host. */
311         if (addr_type == IPV6_ADDR_MAPPED) {
312                 int chk_addr_ret;
313
314                 /* Binding to v4-mapped address on a v6-only socket
315                  * makes no sense
316                  */
317                 if (sk->sk_ipv6only) {
318                         err = -EINVAL;
319                         goto out;
320                 }
321
322                 /* Reproduce AF_INET checks to make the bindings consistent */
323                 v4addr = addr->sin6_addr.s6_addr32[3];
324                 chk_addr_ret = inet_addr_type(net, v4addr);
325                 if (!net->ipv4.sysctl_ip_nonlocal_bind &&
326                     !(inet->freebind || inet->transparent) &&
327                     v4addr != htonl(INADDR_ANY) &&
328                     chk_addr_ret != RTN_LOCAL &&
329                     chk_addr_ret != RTN_MULTICAST &&
330                     chk_addr_ret != RTN_BROADCAST) {
331                         err = -EADDRNOTAVAIL;
332                         goto out;
333                 }
334         } else {
335                 if (addr_type != IPV6_ADDR_ANY) {
336                         struct net_device *dev = NULL;
337
338                         rcu_read_lock();
339                         if (__ipv6_addr_needs_scope_id(addr_type)) {
340                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
341                                     addr->sin6_scope_id) {
342                                         /* Override any existing binding, if another one
343                                          * is supplied by user.
344                                          */
345                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
346                                 }
347
348                                 /* Binding to link-local address requires an interface */
349                                 if (!sk->sk_bound_dev_if) {
350                                         err = -EINVAL;
351                                         goto out_unlock;
352                                 }
353                                 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
354                                 if (!dev) {
355                                         err = -ENODEV;
356                                         goto out_unlock;
357                                 }
358                         }
359
360                         /* ipv4 addr of the socket is invalid.  Only the
361                          * unspecified and mapped address have a v4 equivalent.
362                          */
363                         v4addr = LOOPBACK4_IPV6;
364                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
365                                 if (!net->ipv6.sysctl.ip_nonlocal_bind &&
366                                     !(inet->freebind || inet->transparent) &&
367                                     !ipv6_chk_addr(net, &addr->sin6_addr,
368                                                    dev, 0)) {
369                                         err = -EADDRNOTAVAIL;
370                                         goto out_unlock;
371                                 }
372                         }
373                         rcu_read_unlock();
374                 }
375         }
376
377         inet->inet_rcv_saddr = v4addr;
378         inet->inet_saddr = v4addr;
379
380         sk->sk_v6_rcv_saddr = addr->sin6_addr;
381
382         if (!(addr_type & IPV6_ADDR_MULTICAST))
383                 np->saddr = addr->sin6_addr;
384
385         /* Make sure we are allowed to bind here. */
386         if ((snum || !inet->bind_address_no_port) &&
387             sk->sk_prot->get_port(sk, snum)) {
388                 inet_reset_saddr(sk);
389                 err = -EADDRINUSE;
390                 goto out;
391         }
392
393         if (addr_type != IPV6_ADDR_ANY) {
394                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
395                 if (addr_type != IPV6_ADDR_MAPPED)
396                         sk->sk_ipv6only = 1;
397         }
398         if (snum)
399                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
400         inet->inet_sport = htons(inet->inet_num);
401         inet->inet_dport = 0;
402         inet->inet_daddr = 0;
403 out:
404         release_sock(sk);
405         return err;
406 out_unlock:
407         rcu_read_unlock();
408         goto out;
409 }
410 EXPORT_SYMBOL(inet6_bind);
411
412 int inet6_release(struct socket *sock)
413 {
414         struct sock *sk = sock->sk;
415
416         if (!sk)
417                 return -EINVAL;
418
419         /* Free mc lists */
420         ipv6_sock_mc_close(sk);
421
422         /* Free ac lists */
423         ipv6_sock_ac_close(sk);
424
425         return inet_release(sock);
426 }
427 EXPORT_SYMBOL(inet6_release);
428
429 void inet6_destroy_sock(struct sock *sk)
430 {
431         struct ipv6_pinfo *np = inet6_sk(sk);
432         struct sk_buff *skb;
433         struct ipv6_txoptions *opt;
434
435         /* Release rx options */
436
437         skb = xchg(&np->pktoptions, NULL);
438         if (skb)
439                 kfree_skb(skb);
440
441         skb = xchg(&np->rxpmtu, NULL);
442         if (skb)
443                 kfree_skb(skb);
444
445         /* Free flowlabels */
446         fl6_free_socklist(sk);
447
448         /* Free tx options */
449
450         opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL);
451         if (opt) {
452                 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
453                 txopt_put(opt);
454         }
455 }
456 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
457
458 /*
459  *      This does both peername and sockname.
460  */
461
462 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
463                  int *uaddr_len, int peer)
464 {
465         struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
466         struct sock *sk = sock->sk;
467         struct inet_sock *inet = inet_sk(sk);
468         struct ipv6_pinfo *np = inet6_sk(sk);
469
470         sin->sin6_family = AF_INET6;
471         sin->sin6_flowinfo = 0;
472         sin->sin6_scope_id = 0;
473         if (peer) {
474                 if (!inet->inet_dport)
475                         return -ENOTCONN;
476                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
477                     peer == 1)
478                         return -ENOTCONN;
479                 sin->sin6_port = inet->inet_dport;
480                 sin->sin6_addr = sk->sk_v6_daddr;
481                 if (np->sndflow)
482                         sin->sin6_flowinfo = np->flow_label;
483         } else {
484                 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
485                         sin->sin6_addr = np->saddr;
486                 else
487                         sin->sin6_addr = sk->sk_v6_rcv_saddr;
488
489                 sin->sin6_port = inet->inet_sport;
490         }
491         sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
492                                                  sk->sk_bound_dev_if);
493         *uaddr_len = sizeof(*sin);
494         return 0;
495 }
496 EXPORT_SYMBOL(inet6_getname);
497
498 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
499 {
500         struct sock *sk = sock->sk;
501         struct net *net = sock_net(sk);
502
503         switch (cmd) {
504         case SIOCGSTAMP:
505                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
506
507         case SIOCGSTAMPNS:
508                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
509
510         case SIOCADDRT:
511         case SIOCDELRT:
512
513                 return ipv6_route_ioctl(net, cmd, (void __user *)arg);
514
515         case SIOCSIFADDR:
516                 return addrconf_add_ifaddr(net, (void __user *) arg);
517         case SIOCDIFADDR:
518                 return addrconf_del_ifaddr(net, (void __user *) arg);
519         case SIOCSIFDSTADDR:
520                 return addrconf_set_dstaddr(net, (void __user *) arg);
521         default:
522                 if (!sk->sk_prot->ioctl)
523                         return -ENOIOCTLCMD;
524                 return sk->sk_prot->ioctl(sk, cmd, arg);
525         }
526         /*NOTREACHED*/
527         return 0;
528 }
529 EXPORT_SYMBOL(inet6_ioctl);
530
531 const struct proto_ops inet6_stream_ops = {
532         .family            = PF_INET6,
533         .owner             = THIS_MODULE,
534         .release           = inet6_release,
535         .bind              = inet6_bind,
536         .connect           = inet_stream_connect,       /* ok           */
537         .socketpair        = sock_no_socketpair,        /* a do nothing */
538         .accept            = inet_accept,               /* ok           */
539         .getname           = inet6_getname,
540         .poll              = tcp_poll,                  /* ok           */
541         .ioctl             = inet6_ioctl,               /* must change  */
542         .listen            = inet_listen,               /* ok           */
543         .shutdown          = inet_shutdown,             /* ok           */
544         .setsockopt        = sock_common_setsockopt,    /* ok           */
545         .getsockopt        = sock_common_getsockopt,    /* ok           */
546         .sendmsg           = inet_sendmsg,              /* ok           */
547         .recvmsg           = inet_recvmsg,              /* ok           */
548         .mmap              = sock_no_mmap,
549         .sendpage          = inet_sendpage,
550         .splice_read       = tcp_splice_read,
551 #ifdef CONFIG_COMPAT
552         .compat_setsockopt = compat_sock_common_setsockopt,
553         .compat_getsockopt = compat_sock_common_getsockopt,
554 #endif
555 };
556
557 const struct proto_ops inet6_dgram_ops = {
558         .family            = PF_INET6,
559         .owner             = THIS_MODULE,
560         .release           = inet6_release,
561         .bind              = inet6_bind,
562         .connect           = inet_dgram_connect,        /* ok           */
563         .socketpair        = sock_no_socketpair,        /* a do nothing */
564         .accept            = sock_no_accept,            /* a do nothing */
565         .getname           = inet6_getname,
566         .poll              = udp_poll,                  /* ok           */
567         .ioctl             = inet6_ioctl,               /* must change  */
568         .listen            = sock_no_listen,            /* ok           */
569         .shutdown          = inet_shutdown,             /* ok           */
570         .setsockopt        = sock_common_setsockopt,    /* ok           */
571         .getsockopt        = sock_common_getsockopt,    /* ok           */
572         .sendmsg           = inet_sendmsg,              /* ok           */
573         .recvmsg           = inet_recvmsg,              /* ok           */
574         .mmap              = sock_no_mmap,
575         .sendpage          = sock_no_sendpage,
576 #ifdef CONFIG_COMPAT
577         .compat_setsockopt = compat_sock_common_setsockopt,
578         .compat_getsockopt = compat_sock_common_getsockopt,
579 #endif
580 };
581
582 static const struct net_proto_family inet6_family_ops = {
583         .family = PF_INET6,
584         .create = inet6_create,
585         .owner  = THIS_MODULE,
586 };
587
588 int inet6_register_protosw(struct inet_protosw *p)
589 {
590         struct list_head *lh;
591         struct inet_protosw *answer;
592         struct list_head *last_perm;
593         int protocol = p->protocol;
594         int ret;
595
596         spin_lock_bh(&inetsw6_lock);
597
598         ret = -EINVAL;
599         if (p->type >= SOCK_MAX)
600                 goto out_illegal;
601
602         /* If we are trying to override a permanent protocol, bail. */
603         answer = NULL;
604         ret = -EPERM;
605         last_perm = &inetsw6[p->type];
606         list_for_each(lh, &inetsw6[p->type]) {
607                 answer = list_entry(lh, struct inet_protosw, list);
608
609                 /* Check only the non-wild match. */
610                 if (INET_PROTOSW_PERMANENT & answer->flags) {
611                         if (protocol == answer->protocol)
612                                 break;
613                         last_perm = lh;
614                 }
615
616                 answer = NULL;
617         }
618         if (answer)
619                 goto out_permanent;
620
621         /* Add the new entry after the last permanent entry if any, so that
622          * the new entry does not override a permanent entry when matched with
623          * a wild-card protocol. But it is allowed to override any existing
624          * non-permanent entry.  This means that when we remove this entry, the
625          * system automatically returns to the old behavior.
626          */
627         list_add_rcu(&p->list, last_perm);
628         ret = 0;
629 out:
630         spin_unlock_bh(&inetsw6_lock);
631         return ret;
632
633 out_permanent:
634         pr_err("Attempt to override permanent protocol %d\n", protocol);
635         goto out;
636
637 out_illegal:
638         pr_err("Ignoring attempt to register invalid socket type %d\n",
639                p->type);
640         goto out;
641 }
642 EXPORT_SYMBOL(inet6_register_protosw);
643
644 void
645 inet6_unregister_protosw(struct inet_protosw *p)
646 {
647         if (INET_PROTOSW_PERMANENT & p->flags) {
648                 pr_err("Attempt to unregister permanent protocol %d\n",
649                        p->protocol);
650         } else {
651                 spin_lock_bh(&inetsw6_lock);
652                 list_del_rcu(&p->list);
653                 spin_unlock_bh(&inetsw6_lock);
654
655                 synchronize_net();
656         }
657 }
658 EXPORT_SYMBOL(inet6_unregister_protosw);
659
660 int inet6_sk_rebuild_header(struct sock *sk)
661 {
662         struct ipv6_pinfo *np = inet6_sk(sk);
663         struct dst_entry *dst;
664
665         dst = __sk_dst_check(sk, np->dst_cookie);
666
667         if (!dst) {
668                 struct inet_sock *inet = inet_sk(sk);
669                 struct in6_addr *final_p, final;
670                 struct flowi6 fl6;
671
672                 memset(&fl6, 0, sizeof(fl6));
673                 fl6.flowi6_proto = sk->sk_protocol;
674                 fl6.daddr = sk->sk_v6_daddr;
675                 fl6.saddr = np->saddr;
676                 fl6.flowlabel = np->flow_label;
677                 fl6.flowi6_oif = sk->sk_bound_dev_if;
678                 fl6.flowi6_mark = sk->sk_mark;
679                 fl6.fl6_dport = inet->inet_dport;
680                 fl6.fl6_sport = inet->inet_sport;
681                 fl6.flowi6_uid = sk->sk_uid;
682                 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
683
684                 rcu_read_lock();
685                 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt),
686                                          &final);
687                 rcu_read_unlock();
688
689                 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
690                 if (IS_ERR(dst)) {
691                         sk->sk_route_caps = 0;
692                         sk->sk_err_soft = -PTR_ERR(dst);
693                         return PTR_ERR(dst);
694                 }
695
696                 ip6_dst_store(sk, dst, NULL, NULL);
697         }
698
699         return 0;
700 }
701 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
702
703 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
704                        const struct inet6_skb_parm *opt)
705 {
706         const struct ipv6_pinfo *np = inet6_sk(sk);
707
708         if (np->rxopt.all) {
709                 if (((opt->flags & IP6SKB_HOPBYHOP) &&
710                      (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) ||
711                     (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) &&
712                      np->rxopt.bits.rxflow) ||
713                     (opt->srcrt && (np->rxopt.bits.srcrt ||
714                      np->rxopt.bits.osrcrt)) ||
715                     ((opt->dst1 || opt->dst0) &&
716                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
717                         return true;
718         }
719         return false;
720 }
721 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
722
723 static struct packet_type ipv6_packet_type __read_mostly = {
724         .type = cpu_to_be16(ETH_P_IPV6),
725         .func = ipv6_rcv,
726 };
727
728 static int __init ipv6_packet_init(void)
729 {
730         dev_add_pack(&ipv6_packet_type);
731         return 0;
732 }
733
734 static void ipv6_packet_cleanup(void)
735 {
736         dev_remove_pack(&ipv6_packet_type);
737 }
738
739 static int __net_init ipv6_init_mibs(struct net *net)
740 {
741         int i;
742
743         net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib);
744         if (!net->mib.udp_stats_in6)
745                 return -ENOMEM;
746         net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib);
747         if (!net->mib.udplite_stats_in6)
748                 goto err_udplite_mib;
749         net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib);
750         if (!net->mib.ipv6_statistics)
751                 goto err_ip_mib;
752
753         for_each_possible_cpu(i) {
754                 struct ipstats_mib *af_inet6_stats;
755                 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i);
756                 u64_stats_init(&af_inet6_stats->syncp);
757         }
758
759
760         net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib);
761         if (!net->mib.icmpv6_statistics)
762                 goto err_icmp_mib;
763         net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
764                                                 GFP_KERNEL);
765         if (!net->mib.icmpv6msg_statistics)
766                 goto err_icmpmsg_mib;
767         return 0;
768
769 err_icmpmsg_mib:
770         free_percpu(net->mib.icmpv6_statistics);
771 err_icmp_mib:
772         free_percpu(net->mib.ipv6_statistics);
773 err_ip_mib:
774         free_percpu(net->mib.udplite_stats_in6);
775 err_udplite_mib:
776         free_percpu(net->mib.udp_stats_in6);
777         return -ENOMEM;
778 }
779
780 static void ipv6_cleanup_mibs(struct net *net)
781 {
782         free_percpu(net->mib.udp_stats_in6);
783         free_percpu(net->mib.udplite_stats_in6);
784         free_percpu(net->mib.ipv6_statistics);
785         free_percpu(net->mib.icmpv6_statistics);
786         kfree(net->mib.icmpv6msg_statistics);
787 }
788
789 static int __net_init inet6_net_init(struct net *net)
790 {
791         int err = 0;
792
793         net->ipv6.sysctl.bindv6only = 0;
794         net->ipv6.sysctl.icmpv6_time = 1*HZ;
795         net->ipv6.sysctl.flowlabel_consistency = 1;
796         net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS;
797         net->ipv6.sysctl.idgen_retries = 3;
798         net->ipv6.sysctl.idgen_delay = 1 * HZ;
799         net->ipv6.sysctl.flowlabel_state_ranges = 0;
800         atomic_set(&net->ipv6.fib6_sernum, 1);
801
802         err = ipv6_init_mibs(net);
803         if (err)
804                 return err;
805 #ifdef CONFIG_PROC_FS
806         err = udp6_proc_init(net);
807         if (err)
808                 goto out;
809         err = tcp6_proc_init(net);
810         if (err)
811                 goto proc_tcp6_fail;
812         err = ac6_proc_init(net);
813         if (err)
814                 goto proc_ac6_fail;
815 #endif
816         return err;
817
818 #ifdef CONFIG_PROC_FS
819 proc_ac6_fail:
820         tcp6_proc_exit(net);
821 proc_tcp6_fail:
822         udp6_proc_exit(net);
823 out:
824         ipv6_cleanup_mibs(net);
825         return err;
826 #endif
827 }
828
829 static void __net_exit inet6_net_exit(struct net *net)
830 {
831 #ifdef CONFIG_PROC_FS
832         udp6_proc_exit(net);
833         tcp6_proc_exit(net);
834         ac6_proc_exit(net);
835 #endif
836         ipv6_cleanup_mibs(net);
837 }
838
839 static struct pernet_operations inet6_net_ops = {
840         .init = inet6_net_init,
841         .exit = inet6_net_exit,
842 };
843
844 static const struct ipv6_stub ipv6_stub_impl = {
845         .ipv6_sock_mc_join = ipv6_sock_mc_join,
846         .ipv6_sock_mc_drop = ipv6_sock_mc_drop,
847         .ipv6_dst_lookup = ip6_dst_lookup,
848         .udpv6_encap_enable = udpv6_encap_enable,
849         .ndisc_send_na = ndisc_send_na,
850         .nd_tbl = &nd_tbl,
851 };
852
853 static int __init inet6_init(void)
854 {
855         struct list_head *r;
856         int err = 0;
857
858         sock_skb_cb_check_size(sizeof(struct inet6_skb_parm));
859
860         /* Register the socket-side information for inet6_create.  */
861         for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
862                 INIT_LIST_HEAD(r);
863
864         if (disable_ipv6_mod) {
865                 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
866                 goto out;
867         }
868
869         err = proto_register(&tcpv6_prot, 1);
870         if (err)
871                 goto out;
872
873         err = proto_register(&udpv6_prot, 1);
874         if (err)
875                 goto out_unregister_tcp_proto;
876
877         err = proto_register(&udplitev6_prot, 1);
878         if (err)
879                 goto out_unregister_udp_proto;
880
881         err = proto_register(&rawv6_prot, 1);
882         if (err)
883                 goto out_unregister_udplite_proto;
884
885         err = proto_register(&pingv6_prot, 1);
886         if (err)
887                 goto out_unregister_ping_proto;
888
889         /* We MUST register RAW sockets before we create the ICMP6,
890          * IGMP6, or NDISC control sockets.
891          */
892         err = rawv6_init();
893         if (err)
894                 goto out_unregister_raw_proto;
895
896         /* Register the family here so that the init calls below will
897          * be able to create sockets. (?? is this dangerous ??)
898          */
899         err = sock_register(&inet6_family_ops);
900         if (err)
901                 goto out_sock_register_fail;
902
903         /*
904          *      ipngwg API draft makes clear that the correct semantics
905          *      for TCP and UDP is to consider one TCP and UDP instance
906          *      in a host available by both INET and INET6 APIs and
907          *      able to communicate via both network protocols.
908          */
909
910         err = register_pernet_subsys(&inet6_net_ops);
911         if (err)
912                 goto register_pernet_fail;
913         err = icmpv6_init();
914         if (err)
915                 goto icmp_fail;
916         err = ip6_mr_init();
917         if (err)
918                 goto ipmr_fail;
919         err = ndisc_init();
920         if (err)
921                 goto ndisc_fail;
922         err = igmp6_init();
923         if (err)
924                 goto igmp_fail;
925
926         ipv6_stub = &ipv6_stub_impl;
927
928         err = ipv6_netfilter_init();
929         if (err)
930                 goto netfilter_fail;
931         /* Create /proc/foo6 entries. */
932 #ifdef CONFIG_PROC_FS
933         err = -ENOMEM;
934         if (raw6_proc_init())
935                 goto proc_raw6_fail;
936         if (udplite6_proc_init())
937                 goto proc_udplite6_fail;
938         if (ipv6_misc_proc_init())
939                 goto proc_misc6_fail;
940         if (if6_proc_init())
941                 goto proc_if6_fail;
942 #endif
943         err = ip6_route_init();
944         if (err)
945                 goto ip6_route_fail;
946         err = ndisc_late_init();
947         if (err)
948                 goto ndisc_late_fail;
949         err = ip6_flowlabel_init();
950         if (err)
951                 goto ip6_flowlabel_fail;
952         err = addrconf_init();
953         if (err)
954                 goto addrconf_fail;
955
956         /* Init v6 extension headers. */
957         err = ipv6_exthdrs_init();
958         if (err)
959                 goto ipv6_exthdrs_fail;
960
961         err = ipv6_frag_init();
962         if (err)
963                 goto ipv6_frag_fail;
964
965         /* Init v6 transport protocols. */
966         err = udpv6_init();
967         if (err)
968                 goto udpv6_fail;
969
970         err = udplitev6_init();
971         if (err)
972                 goto udplitev6_fail;
973
974         err = tcpv6_init();
975         if (err)
976                 goto tcpv6_fail;
977
978         err = ipv6_packet_init();
979         if (err)
980                 goto ipv6_packet_fail;
981
982         err = pingv6_init();
983         if (err)
984                 goto pingv6_fail;
985
986 #ifdef CONFIG_SYSCTL
987         err = ipv6_sysctl_register();
988         if (err)
989                 goto sysctl_fail;
990 #endif
991 out:
992         return err;
993
994 #ifdef CONFIG_SYSCTL
995 sysctl_fail:
996         pingv6_exit();
997 #endif
998 pingv6_fail:
999         ipv6_packet_cleanup();
1000 ipv6_packet_fail:
1001         tcpv6_exit();
1002 tcpv6_fail:
1003         udplitev6_exit();
1004 udplitev6_fail:
1005         udpv6_exit();
1006 udpv6_fail:
1007         ipv6_frag_exit();
1008 ipv6_frag_fail:
1009         ipv6_exthdrs_exit();
1010 ipv6_exthdrs_fail:
1011         addrconf_cleanup();
1012 addrconf_fail:
1013         ip6_flowlabel_cleanup();
1014 ip6_flowlabel_fail:
1015         ndisc_late_cleanup();
1016 ndisc_late_fail:
1017         ip6_route_cleanup();
1018 ip6_route_fail:
1019 #ifdef CONFIG_PROC_FS
1020         if6_proc_exit();
1021 proc_if6_fail:
1022         ipv6_misc_proc_exit();
1023 proc_misc6_fail:
1024         udplite6_proc_exit();
1025 proc_udplite6_fail:
1026         raw6_proc_exit();
1027 proc_raw6_fail:
1028 #endif
1029         ipv6_netfilter_fini();
1030 netfilter_fail:
1031         igmp6_cleanup();
1032 igmp_fail:
1033         ndisc_cleanup();
1034 ndisc_fail:
1035         ip6_mr_cleanup();
1036 ipmr_fail:
1037         icmpv6_cleanup();
1038 icmp_fail:
1039         unregister_pernet_subsys(&inet6_net_ops);
1040 register_pernet_fail:
1041         sock_unregister(PF_INET6);
1042         rtnl_unregister_all(PF_INET6);
1043 out_sock_register_fail:
1044         rawv6_exit();
1045 out_unregister_ping_proto:
1046         proto_unregister(&pingv6_prot);
1047 out_unregister_raw_proto:
1048         proto_unregister(&rawv6_prot);
1049 out_unregister_udplite_proto:
1050         proto_unregister(&udplitev6_prot);
1051 out_unregister_udp_proto:
1052         proto_unregister(&udpv6_prot);
1053 out_unregister_tcp_proto:
1054         proto_unregister(&tcpv6_prot);
1055         goto out;
1056 }
1057 module_init(inet6_init);
1058
1059 MODULE_ALIAS_NETPROTO(PF_INET6);