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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 #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 &&
164             !ns_capable(net->user_ns, CAP_NET_RAW))
165                 goto out_rcu_unlock;
166
167         sock->ops = answer->ops;
168         answer_prot = answer->prot;
169         answer_no_check = answer->no_check;
170         answer_flags = answer->flags;
171         rcu_read_unlock();
172
173         WARN_ON(answer_prot->slab == NULL);
174
175         err = -ENOBUFS;
176         sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot);
177         if (sk == NULL)
178                 goto out;
179
180         sock_init_data(sock, sk);
181
182         err = 0;
183         sk->sk_no_check = answer_no_check;
184         if (INET_PROTOSW_REUSE & answer_flags)
185                 sk->sk_reuse = SK_CAN_REUSE;
186
187         inet = inet_sk(sk);
188         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
189
190         if (SOCK_RAW == sock->type) {
191                 inet->inet_num = protocol;
192                 if (IPPROTO_RAW == protocol)
193                         inet->hdrincl = 1;
194         }
195
196         sk->sk_destruct         = inet_sock_destruct;
197         sk->sk_family           = PF_INET6;
198         sk->sk_protocol         = protocol;
199
200         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
201
202         inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
203         np->hop_limit   = -1;
204         np->mcast_hops  = IPV6_DEFAULT_MCASTHOPS;
205         np->mc_loop     = 1;
206         np->pmtudisc    = IPV6_PMTUDISC_WANT;
207         np->ipv6only    = net->ipv6.sysctl.bindv6only;
208
209         /* Init the ipv4 part of the socket since we can have sockets
210          * using v6 API for ipv4.
211          */
212         inet->uc_ttl    = -1;
213
214         inet->mc_loop   = 1;
215         inet->mc_ttl    = 1;
216         inet->mc_index  = 0;
217         inet->mc_list   = NULL;
218         inet->rcv_tos   = 0;
219
220         if (ipv4_config.no_pmtu_disc)
221                 inet->pmtudisc = IP_PMTUDISC_DONT;
222         else
223                 inet->pmtudisc = IP_PMTUDISC_WANT;
224         /*
225          * Increment only the relevant sk_prot->socks debug field, this changes
226          * the previous behaviour of incrementing both the equivalent to
227          * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
228          *
229          * This allows better debug granularity as we'll know exactly how many
230          * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
231          * transport protocol socks. -acme
232          */
233         sk_refcnt_debug_inc(sk);
234
235         if (inet->inet_num) {
236                 /* It assumes that any protocol which allows
237                  * the user to assign a number at socket
238                  * creation time automatically shares.
239                  */
240                 inet->inet_sport = htons(inet->inet_num);
241                 sk->sk_prot->hash(sk);
242         }
243         if (sk->sk_prot->init) {
244                 err = sk->sk_prot->init(sk);
245                 if (err) {
246                         sk_common_release(sk);
247                         goto out;
248                 }
249         }
250 out:
251         return err;
252 out_rcu_unlock:
253         rcu_read_unlock();
254         goto out;
255 }
256
257
258 /* bind for INET6 API */
259 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
260 {
261         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
262         struct sock *sk = sock->sk;
263         struct inet_sock *inet = inet_sk(sk);
264         struct ipv6_pinfo *np = inet6_sk(sk);
265         struct net *net = sock_net(sk);
266         __be32 v4addr = 0;
267         unsigned short snum;
268         int addr_type = 0;
269         int err = 0;
270
271         /* If the socket has its own bind function then use it. */
272         if (sk->sk_prot->bind)
273                 return sk->sk_prot->bind(sk, uaddr, addr_len);
274
275         if (addr_len < SIN6_LEN_RFC2133)
276                 return -EINVAL;
277
278         if (addr->sin6_family != AF_INET6)
279                 return -EAFNOSUPPORT;
280
281         addr_type = ipv6_addr_type(&addr->sin6_addr);
282         if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
283                 return -EINVAL;
284
285         snum = ntohs(addr->sin6_port);
286         if (snum && snum < PROT_SOCK && !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
287                 return -EACCES;
288
289         lock_sock(sk);
290
291         /* Check these errors (active socket, double bind). */
292         if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
293                 err = -EINVAL;
294                 goto out;
295         }
296
297         /* Check if the address belongs to the host. */
298         if (addr_type == IPV6_ADDR_MAPPED) {
299                 int chk_addr_ret;
300
301                 /* Binding to v4-mapped address on a v6-only socket
302                  * makes no sense
303                  */
304                 if (np->ipv6only) {
305                         err = -EINVAL;
306                         goto out;
307                 }
308
309                 /* Reproduce AF_INET checks to make the bindings consistent */
310                 v4addr = addr->sin6_addr.s6_addr32[3];
311                 chk_addr_ret = inet_addr_type(net, v4addr);
312                 if (!sysctl_ip_nonlocal_bind &&
313                     !(inet->freebind || inet->transparent) &&
314                     v4addr != htonl(INADDR_ANY) &&
315                     chk_addr_ret != RTN_LOCAL &&
316                     chk_addr_ret != RTN_MULTICAST &&
317                     chk_addr_ret != RTN_BROADCAST) {
318                         err = -EADDRNOTAVAIL;
319                         goto out;
320                 }
321         } else {
322                 if (addr_type != IPV6_ADDR_ANY) {
323                         struct net_device *dev = NULL;
324
325                         rcu_read_lock();
326                         if (__ipv6_addr_needs_scope_id(addr_type)) {
327                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
328                                     addr->sin6_scope_id) {
329                                         /* Override any existing binding, if another one
330                                          * is supplied by user.
331                                          */
332                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
333                                 }
334
335                                 /* Binding to link-local address requires an interface */
336                                 if (!sk->sk_bound_dev_if) {
337                                         err = -EINVAL;
338                                         goto out_unlock;
339                                 }
340                                 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
341                                 if (!dev) {
342                                         err = -ENODEV;
343                                         goto out_unlock;
344                                 }
345                         }
346
347                         /* ipv4 addr of the socket is invalid.  Only the
348                          * unspecified and mapped address have a v4 equivalent.
349                          */
350                         v4addr = LOOPBACK4_IPV6;
351                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
352                                 if (!(inet->freebind || inet->transparent) &&
353                                     !ipv6_chk_addr(net, &addr->sin6_addr,
354                                                    dev, 0)) {
355                                         err = -EADDRNOTAVAIL;
356                                         goto out_unlock;
357                                 }
358                         }
359                         rcu_read_unlock();
360                 }
361         }
362
363         inet->inet_rcv_saddr = v4addr;
364         inet->inet_saddr = v4addr;
365
366         np->rcv_saddr = addr->sin6_addr;
367
368         if (!(addr_type & IPV6_ADDR_MULTICAST))
369                 np->saddr = addr->sin6_addr;
370
371         /* Make sure we are allowed to bind here. */
372         if (sk->sk_prot->get_port(sk, snum)) {
373                 inet_reset_saddr(sk);
374                 err = -EADDRINUSE;
375                 goto out;
376         }
377
378         if (addr_type != IPV6_ADDR_ANY) {
379                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
380                 if (addr_type != IPV6_ADDR_MAPPED)
381                         np->ipv6only = 1;
382         }
383         if (snum)
384                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
385         inet->inet_sport = htons(inet->inet_num);
386         inet->inet_dport = 0;
387         inet->inet_daddr = 0;
388 out:
389         release_sock(sk);
390         return err;
391 out_unlock:
392         rcu_read_unlock();
393         goto out;
394 }
395 EXPORT_SYMBOL(inet6_bind);
396
397 int inet6_release(struct socket *sock)
398 {
399         struct sock *sk = sock->sk;
400
401         if (sk == NULL)
402                 return -EINVAL;
403
404         /* Free mc lists */
405         ipv6_sock_mc_close(sk);
406
407         /* Free ac lists */
408         ipv6_sock_ac_close(sk);
409
410         return inet_release(sock);
411 }
412 EXPORT_SYMBOL(inet6_release);
413
414 void inet6_destroy_sock(struct sock *sk)
415 {
416         struct ipv6_pinfo *np = inet6_sk(sk);
417         struct sk_buff *skb;
418         struct ipv6_txoptions *opt;
419
420         /* Release rx options */
421
422         skb = xchg(&np->pktoptions, NULL);
423         if (skb != NULL)
424                 kfree_skb(skb);
425
426         skb = xchg(&np->rxpmtu, NULL);
427         if (skb != NULL)
428                 kfree_skb(skb);
429
430         /* Free flowlabels */
431         fl6_free_socklist(sk);
432
433         /* Free tx options */
434
435         opt = xchg(&np->opt, NULL);
436         if (opt != NULL)
437                 sock_kfree_s(sk, opt, opt->tot_len);
438 }
439 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
440
441 /*
442  *      This does both peername and sockname.
443  */
444
445 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
446                  int *uaddr_len, int peer)
447 {
448         struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
449         struct sock *sk = sock->sk;
450         struct inet_sock *inet = inet_sk(sk);
451         struct ipv6_pinfo *np = inet6_sk(sk);
452
453         sin->sin6_family = AF_INET6;
454         sin->sin6_flowinfo = 0;
455         sin->sin6_scope_id = 0;
456         if (peer) {
457                 if (!inet->inet_dport)
458                         return -ENOTCONN;
459                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
460                     peer == 1)
461                         return -ENOTCONN;
462                 sin->sin6_port = inet->inet_dport;
463                 sin->sin6_addr = np->daddr;
464                 if (np->sndflow)
465                         sin->sin6_flowinfo = np->flow_label;
466         } else {
467                 if (ipv6_addr_any(&np->rcv_saddr))
468                         sin->sin6_addr = np->saddr;
469                 else
470                         sin->sin6_addr = np->rcv_saddr;
471
472                 sin->sin6_port = inet->inet_sport;
473         }
474         sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
475                                                  sk->sk_bound_dev_if);
476         *uaddr_len = sizeof(*sin);
477         return 0;
478 }
479 EXPORT_SYMBOL(inet6_getname);
480
481 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
482 {
483         struct sock *sk = sock->sk;
484         struct net *net = sock_net(sk);
485
486         switch (cmd) {
487         case SIOCGSTAMP:
488                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
489
490         case SIOCGSTAMPNS:
491                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
492
493         case SIOCADDRT:
494         case SIOCDELRT:
495
496                 return ipv6_route_ioctl(net, cmd, (void __user *)arg);
497
498         case SIOCSIFADDR:
499                 return addrconf_add_ifaddr(net, (void __user *) arg);
500         case SIOCDIFADDR:
501                 return addrconf_del_ifaddr(net, (void __user *) arg);
502         case SIOCSIFDSTADDR:
503                 return addrconf_set_dstaddr(net, (void __user *) arg);
504         default:
505                 if (!sk->sk_prot->ioctl)
506                         return -ENOIOCTLCMD;
507                 return sk->sk_prot->ioctl(sk, cmd, arg);
508         }
509         /*NOTREACHED*/
510         return 0;
511 }
512 EXPORT_SYMBOL(inet6_ioctl);
513
514 const struct proto_ops inet6_stream_ops = {
515         .family            = PF_INET6,
516         .owner             = THIS_MODULE,
517         .release           = inet6_release,
518         .bind              = inet6_bind,
519         .connect           = inet_stream_connect,       /* ok           */
520         .socketpair        = sock_no_socketpair,        /* a do nothing */
521         .accept            = inet_accept,               /* ok           */
522         .getname           = inet6_getname,
523         .poll              = tcp_poll,                  /* ok           */
524         .ioctl             = inet6_ioctl,               /* must change  */
525         .listen            = inet_listen,               /* ok           */
526         .shutdown          = inet_shutdown,             /* ok           */
527         .setsockopt        = sock_common_setsockopt,    /* ok           */
528         .getsockopt        = sock_common_getsockopt,    /* ok           */
529         .sendmsg           = inet_sendmsg,              /* ok           */
530         .recvmsg           = inet_recvmsg,              /* ok           */
531         .mmap              = sock_no_mmap,
532         .sendpage          = inet_sendpage,
533         .splice_read       = tcp_splice_read,
534 #ifdef CONFIG_COMPAT
535         .compat_setsockopt = compat_sock_common_setsockopt,
536         .compat_getsockopt = compat_sock_common_getsockopt,
537 #endif
538 };
539
540 const struct proto_ops inet6_dgram_ops = {
541         .family            = PF_INET6,
542         .owner             = THIS_MODULE,
543         .release           = inet6_release,
544         .bind              = inet6_bind,
545         .connect           = inet_dgram_connect,        /* ok           */
546         .socketpair        = sock_no_socketpair,        /* a do nothing */
547         .accept            = sock_no_accept,            /* a do nothing */
548         .getname           = inet6_getname,
549         .poll              = udp_poll,                  /* ok           */
550         .ioctl             = inet6_ioctl,               /* must change  */
551         .listen            = sock_no_listen,            /* ok           */
552         .shutdown          = inet_shutdown,             /* ok           */
553         .setsockopt        = sock_common_setsockopt,    /* ok           */
554         .getsockopt        = sock_common_getsockopt,    /* ok           */
555         .sendmsg           = inet_sendmsg,              /* ok           */
556         .recvmsg           = inet_recvmsg,              /* ok           */
557         .mmap              = sock_no_mmap,
558         .sendpage          = sock_no_sendpage,
559 #ifdef CONFIG_COMPAT
560         .compat_setsockopt = compat_sock_common_setsockopt,
561         .compat_getsockopt = compat_sock_common_getsockopt,
562 #endif
563 };
564
565 static const struct net_proto_family inet6_family_ops = {
566         .family = PF_INET6,
567         .create = inet6_create,
568         .owner  = THIS_MODULE,
569 };
570
571 int inet6_register_protosw(struct inet_protosw *p)
572 {
573         struct list_head *lh;
574         struct inet_protosw *answer;
575         struct list_head *last_perm;
576         int protocol = p->protocol;
577         int ret;
578
579         spin_lock_bh(&inetsw6_lock);
580
581         ret = -EINVAL;
582         if (p->type >= SOCK_MAX)
583                 goto out_illegal;
584
585         /* If we are trying to override a permanent protocol, bail. */
586         answer = NULL;
587         ret = -EPERM;
588         last_perm = &inetsw6[p->type];
589         list_for_each(lh, &inetsw6[p->type]) {
590                 answer = list_entry(lh, struct inet_protosw, list);
591
592                 /* Check only the non-wild match. */
593                 if (INET_PROTOSW_PERMANENT & answer->flags) {
594                         if (protocol == answer->protocol)
595                                 break;
596                         last_perm = lh;
597                 }
598
599                 answer = NULL;
600         }
601         if (answer)
602                 goto out_permanent;
603
604         /* Add the new entry after the last permanent entry if any, so that
605          * the new entry does not override a permanent entry when matched with
606          * a wild-card protocol. But it is allowed to override any existing
607          * non-permanent entry.  This means that when we remove this entry, the
608          * system automatically returns to the old behavior.
609          */
610         list_add_rcu(&p->list, last_perm);
611         ret = 0;
612 out:
613         spin_unlock_bh(&inetsw6_lock);
614         return ret;
615
616 out_permanent:
617         pr_err("Attempt to override permanent protocol %d\n", protocol);
618         goto out;
619
620 out_illegal:
621         pr_err("Ignoring attempt to register invalid socket type %d\n",
622                p->type);
623         goto out;
624 }
625 EXPORT_SYMBOL(inet6_register_protosw);
626
627 void
628 inet6_unregister_protosw(struct inet_protosw *p)
629 {
630         if (INET_PROTOSW_PERMANENT & p->flags) {
631                 pr_err("Attempt to unregister permanent protocol %d\n",
632                        p->protocol);
633         } else {
634                 spin_lock_bh(&inetsw6_lock);
635                 list_del_rcu(&p->list);
636                 spin_unlock_bh(&inetsw6_lock);
637
638                 synchronize_net();
639         }
640 }
641 EXPORT_SYMBOL(inet6_unregister_protosw);
642
643 int inet6_sk_rebuild_header(struct sock *sk)
644 {
645         struct ipv6_pinfo *np = inet6_sk(sk);
646         struct dst_entry *dst;
647
648         dst = __sk_dst_check(sk, np->dst_cookie);
649
650         if (dst == NULL) {
651                 struct inet_sock *inet = inet_sk(sk);
652                 struct in6_addr *final_p, final;
653                 struct flowi6 fl6;
654
655                 memset(&fl6, 0, sizeof(fl6));
656                 fl6.flowi6_proto = sk->sk_protocol;
657                 fl6.daddr = np->daddr;
658                 fl6.saddr = np->saddr;
659                 fl6.flowlabel = np->flow_label;
660                 fl6.flowi6_oif = sk->sk_bound_dev_if;
661                 fl6.flowi6_mark = sk->sk_mark;
662                 fl6.fl6_dport = inet->inet_dport;
663                 fl6.fl6_sport = inet->inet_sport;
664                 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
665
666                 final_p = fl6_update_dst(&fl6, np->opt, &final);
667
668                 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
669                 if (IS_ERR(dst)) {
670                         sk->sk_route_caps = 0;
671                         sk->sk_err_soft = -PTR_ERR(dst);
672                         return PTR_ERR(dst);
673                 }
674
675                 __ip6_dst_store(sk, dst, NULL, NULL);
676         }
677
678         return 0;
679 }
680 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
681
682 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb)
683 {
684         const struct ipv6_pinfo *np = inet6_sk(sk);
685         const struct inet6_skb_parm *opt = IP6CB(skb);
686
687         if (np->rxopt.all) {
688                 if ((opt->hop && (np->rxopt.bits.hopopts ||
689                                   np->rxopt.bits.ohopopts)) ||
690                     ((IPV6_FLOWINFO_MASK &
691                       *(__be32 *)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         if (snmp_mib_init((void __percpu **)net->mib.udp_stats_in6,
722                           sizeof(struct udp_mib),
723                           __alignof__(struct udp_mib)) < 0)
724                 return -ENOMEM;
725         if (snmp_mib_init((void __percpu **)net->mib.udplite_stats_in6,
726                           sizeof(struct udp_mib),
727                           __alignof__(struct udp_mib)) < 0)
728                 goto err_udplite_mib;
729         if (snmp_mib_init((void __percpu **)net->mib.ipv6_statistics,
730                           sizeof(struct ipstats_mib),
731                           __alignof__(struct ipstats_mib)) < 0)
732                 goto err_ip_mib;
733         if (snmp_mib_init((void __percpu **)net->mib.icmpv6_statistics,
734                           sizeof(struct icmpv6_mib),
735                           __alignof__(struct icmpv6_mib)) < 0)
736                 goto err_icmp_mib;
737         net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
738                                                 GFP_KERNEL);
739         if (!net->mib.icmpv6msg_statistics)
740                 goto err_icmpmsg_mib;
741         return 0;
742
743 err_icmpmsg_mib:
744         snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics);
745 err_icmp_mib:
746         snmp_mib_free((void __percpu **)net->mib.ipv6_statistics);
747 err_ip_mib:
748         snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6);
749 err_udplite_mib:
750         snmp_mib_free((void __percpu **)net->mib.udp_stats_in6);
751         return -ENOMEM;
752 }
753
754 static void ipv6_cleanup_mibs(struct net *net)
755 {
756         snmp_mib_free((void __percpu **)net->mib.udp_stats_in6);
757         snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6);
758         snmp_mib_free((void __percpu **)net->mib.ipv6_statistics);
759         snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics);
760         kfree(net->mib.icmpv6msg_statistics);
761 }
762
763 static int __net_init inet6_net_init(struct net *net)
764 {
765         int err = 0;
766
767         net->ipv6.sysctl.bindv6only = 0;
768         net->ipv6.sysctl.icmpv6_time = 1*HZ;
769         atomic_set(&net->ipv6.rt_genid, 0);
770
771         err = ipv6_init_mibs(net);
772         if (err)
773                 return err;
774 #ifdef CONFIG_PROC_FS
775         err = udp6_proc_init(net);
776         if (err)
777                 goto out;
778         err = tcp6_proc_init(net);
779         if (err)
780                 goto proc_tcp6_fail;
781         err = ac6_proc_init(net);
782         if (err)
783                 goto proc_ac6_fail;
784 #endif
785         return err;
786
787 #ifdef CONFIG_PROC_FS
788 proc_ac6_fail:
789         tcp6_proc_exit(net);
790 proc_tcp6_fail:
791         udp6_proc_exit(net);
792 out:
793         ipv6_cleanup_mibs(net);
794         return err;
795 #endif
796 }
797
798 static void __net_exit inet6_net_exit(struct net *net)
799 {
800 #ifdef CONFIG_PROC_FS
801         udp6_proc_exit(net);
802         tcp6_proc_exit(net);
803         ac6_proc_exit(net);
804 #endif
805         ipv6_cleanup_mibs(net);
806 }
807
808 static struct pernet_operations inet6_net_ops = {
809         .init = inet6_net_init,
810         .exit = inet6_net_exit,
811 };
812
813 static int __init inet6_init(void)
814 {
815         struct list_head *r;
816         int err = 0;
817
818         BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > FIELD_SIZEOF(struct sk_buff, cb));
819
820         /* Register the socket-side information for inet6_create.  */
821         for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
822                 INIT_LIST_HEAD(r);
823
824         if (disable_ipv6_mod) {
825                 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
826                 goto out;
827         }
828
829         err = proto_register(&tcpv6_prot, 1);
830         if (err)
831                 goto out;
832
833         err = proto_register(&udpv6_prot, 1);
834         if (err)
835                 goto out_unregister_tcp_proto;
836
837         err = proto_register(&udplitev6_prot, 1);
838         if (err)
839                 goto out_unregister_udp_proto;
840
841         err = proto_register(&rawv6_prot, 1);
842         if (err)
843                 goto out_unregister_udplite_proto;
844
845         err = proto_register(&pingv6_prot, 1);
846         if (err)
847                 goto out_unregister_ping_proto;
848
849         /* We MUST register RAW sockets before we create the ICMP6,
850          * IGMP6, or NDISC control sockets.
851          */
852         err = rawv6_init();
853         if (err)
854                 goto out_unregister_raw_proto;
855
856         /* Register the family here so that the init calls below will
857          * be able to create sockets. (?? is this dangerous ??)
858          */
859         err = sock_register(&inet6_family_ops);
860         if (err)
861                 goto out_sock_register_fail;
862
863         tcpv6_prot.sysctl_mem = init_net.ipv4.sysctl_tcp_mem;
864
865         /*
866          *      ipngwg API draft makes clear that the correct semantics
867          *      for TCP and UDP is to consider one TCP and UDP instance
868          *      in a host available by both INET and INET6 APIs and
869          *      able to communicate via both network protocols.
870          */
871
872         err = register_pernet_subsys(&inet6_net_ops);
873         if (err)
874                 goto register_pernet_fail;
875         err = icmpv6_init();
876         if (err)
877                 goto icmp_fail;
878         err = ip6_mr_init();
879         if (err)
880                 goto ipmr_fail;
881         err = ndisc_init();
882         if (err)
883                 goto ndisc_fail;
884         err = igmp6_init();
885         if (err)
886                 goto igmp_fail;
887         err = ipv6_netfilter_init();
888         if (err)
889                 goto netfilter_fail;
890         /* Create /proc/foo6 entries. */
891 #ifdef CONFIG_PROC_FS
892         err = -ENOMEM;
893         if (raw6_proc_init())
894                 goto proc_raw6_fail;
895         if (udplite6_proc_init())
896                 goto proc_udplite6_fail;
897         if (ipv6_misc_proc_init())
898                 goto proc_misc6_fail;
899         if (if6_proc_init())
900                 goto proc_if6_fail;
901 #endif
902         err = ip6_route_init();
903         if (err)
904                 goto ip6_route_fail;
905         err = ip6_flowlabel_init();
906         if (err)
907                 goto ip6_flowlabel_fail;
908         err = addrconf_init();
909         if (err)
910                 goto addrconf_fail;
911
912         /* Init v6 extension headers. */
913         err = ipv6_exthdrs_init();
914         if (err)
915                 goto ipv6_exthdrs_fail;
916
917         err = ipv6_frag_init();
918         if (err)
919                 goto ipv6_frag_fail;
920
921         /* Init v6 transport protocols. */
922         err = udpv6_init();
923         if (err)
924                 goto udpv6_fail;
925
926         err = udplitev6_init();
927         if (err)
928                 goto udplitev6_fail;
929
930         err = tcpv6_init();
931         if (err)
932                 goto tcpv6_fail;
933
934         err = ipv6_packet_init();
935         if (err)
936                 goto ipv6_packet_fail;
937
938         err = pingv6_init();
939         if (err)
940                 goto pingv6_fail;
941
942 #ifdef CONFIG_SYSCTL
943         err = ipv6_sysctl_register();
944         if (err)
945                 goto sysctl_fail;
946 #endif
947 out:
948         return err;
949
950 #ifdef CONFIG_SYSCTL
951 sysctl_fail:
952         ipv6_packet_cleanup();
953 #endif
954 pingv6_fail:
955         pingv6_exit();
956 ipv6_packet_fail:
957         tcpv6_exit();
958 tcpv6_fail:
959         udplitev6_exit();
960 udplitev6_fail:
961         udpv6_exit();
962 udpv6_fail:
963         ipv6_frag_exit();
964 ipv6_frag_fail:
965         ipv6_exthdrs_exit();
966 ipv6_exthdrs_fail:
967         addrconf_cleanup();
968 addrconf_fail:
969         ip6_flowlabel_cleanup();
970 ip6_flowlabel_fail:
971         ip6_route_cleanup();
972 ip6_route_fail:
973 #ifdef CONFIG_PROC_FS
974         if6_proc_exit();
975 proc_if6_fail:
976         ipv6_misc_proc_exit();
977 proc_misc6_fail:
978         udplite6_proc_exit();
979 proc_udplite6_fail:
980         raw6_proc_exit();
981 proc_raw6_fail:
982 #endif
983         ipv6_netfilter_fini();
984 netfilter_fail:
985         igmp6_cleanup();
986 igmp_fail:
987         ndisc_cleanup();
988 ndisc_fail:
989         ip6_mr_cleanup();
990 ipmr_fail:
991         icmpv6_cleanup();
992 icmp_fail:
993         unregister_pernet_subsys(&inet6_net_ops);
994 register_pernet_fail:
995         sock_unregister(PF_INET6);
996         rtnl_unregister_all(PF_INET6);
997 out_sock_register_fail:
998         rawv6_exit();
999 out_unregister_ping_proto:
1000         proto_unregister(&pingv6_prot);
1001 out_unregister_raw_proto:
1002         proto_unregister(&rawv6_prot);
1003 out_unregister_udplite_proto:
1004         proto_unregister(&udplitev6_prot);
1005 out_unregister_udp_proto:
1006         proto_unregister(&udpv6_prot);
1007 out_unregister_tcp_proto:
1008         proto_unregister(&tcpv6_prot);
1009         goto out;
1010 }
1011 module_init(inet6_init);
1012
1013 static void __exit inet6_exit(void)
1014 {
1015         if (disable_ipv6_mod)
1016                 return;
1017
1018         /* First of all disallow new sockets creation. */
1019         sock_unregister(PF_INET6);
1020         /* Disallow any further netlink messages */
1021         rtnl_unregister_all(PF_INET6);
1022
1023         udpv6_exit();
1024         udplitev6_exit();
1025         tcpv6_exit();
1026
1027         /* Cleanup code parts. */
1028         ipv6_packet_cleanup();
1029         ipv6_frag_exit();
1030         ipv6_exthdrs_exit();
1031         addrconf_cleanup();
1032         ip6_flowlabel_cleanup();
1033         ip6_route_cleanup();
1034 #ifdef CONFIG_PROC_FS
1035
1036         /* Cleanup code parts. */
1037         if6_proc_exit();
1038         ipv6_misc_proc_exit();
1039         udplite6_proc_exit();
1040         raw6_proc_exit();
1041 #endif
1042         ipv6_netfilter_fini();
1043         igmp6_cleanup();
1044         ndisc_cleanup();
1045         ip6_mr_cleanup();
1046         icmpv6_cleanup();
1047         rawv6_exit();
1048
1049         unregister_pernet_subsys(&inet6_net_ops);
1050         proto_unregister(&rawv6_prot);
1051         proto_unregister(&udplitev6_prot);
1052         proto_unregister(&udpv6_prot);
1053         proto_unregister(&tcpv6_prot);
1054
1055         rcu_barrier(); /* Wait for completion of call_rcu()'s */
1056 }
1057 module_exit(inet6_exit);
1058
1059 MODULE_ALIAS_NETPROTO(PF_INET6);