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TOMOYO Linux Cross Reference
Linux/net/ipv6/af_inet6.c

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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 #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         /* Look for the requested type/protocol pair. */
113 lookup_protocol:
114         err = -ESOCKTNOSUPPORT;
115         rcu_read_lock();
116         list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
117 
118                 err = 0;
119                 /* Check the non-wild match. */
120                 if (protocol == answer->protocol) {
121                         if (protocol != IPPROTO_IP)
122                                 break;
123                 } else {
124                         /* Check for the two wild cases. */
125                         if (IPPROTO_IP == protocol) {
126                                 protocol = answer->protocol;
127                                 break;
128                         }
129                         if (IPPROTO_IP == answer->protocol)
130                                 break;
131                 }
132                 err = -EPROTONOSUPPORT;
133         }
134 
135         if (err) {
136                 if (try_loading_module < 2) {
137                         rcu_read_unlock();
138                         /*
139                          * Be more specific, e.g. net-pf-10-proto-132-type-1
140                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
141                          */
142                         if (++try_loading_module == 1)
143                                 request_module("net-pf-%d-proto-%d-type-%d",
144                                                 PF_INET6, protocol, sock->type);
145                         /*
146                          * Fall back to generic, e.g. net-pf-10-proto-132
147                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
148                          */
149                         else
150                                 request_module("net-pf-%d-proto-%d",
151                                                 PF_INET6, protocol);
152                         goto lookup_protocol;
153                 } else
154                         goto out_rcu_unlock;
155         }
156 
157         err = -EPERM;
158         if (sock->type == SOCK_RAW && !kern &&
159             !ns_capable(net->user_ns, CAP_NET_RAW))
160                 goto out_rcu_unlock;
161 
162         sock->ops = answer->ops;
163         answer_prot = answer->prot;
164         answer_flags = answer->flags;
165         rcu_read_unlock();
166 
167         WARN_ON(!answer_prot->slab);
168 
169         err = -ENOBUFS;
170         sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern);
171         if (!sk)
172                 goto out;
173 
174         sock_init_data(sock, sk);
175 
176         err = 0;
177         if (INET_PROTOSW_REUSE & answer_flags)
178                 sk->sk_reuse = SK_CAN_REUSE;
179 
180         inet = inet_sk(sk);
181         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
182 
183         if (SOCK_RAW == sock->type) {
184                 inet->inet_num = protocol;
185                 if (IPPROTO_RAW == protocol)
186                         inet->hdrincl = 1;
187         }
188 
189         sk->sk_destruct         = inet_sock_destruct;
190         sk->sk_family           = PF_INET6;
191         sk->sk_protocol         = protocol;
192 
193         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
194 
195         inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
196         np->hop_limit   = -1;
197         np->mcast_hops  = IPV6_DEFAULT_MCASTHOPS;
198         np->mc_loop     = 1;
199         np->pmtudisc    = IPV6_PMTUDISC_WANT;
200         sk->sk_ipv6only = net->ipv6.sysctl.bindv6only;
201 
202         /* Init the ipv4 part of the socket since we can have sockets
203          * using v6 API for ipv4.
204          */
205         inet->uc_ttl    = -1;
206 
207         inet->mc_loop   = 1;
208         inet->mc_ttl    = 1;
209         inet->mc_index  = 0;
210         inet->mc_list   = NULL;
211         inet->rcv_tos   = 0;
212 
213         if (net->ipv4.sysctl_ip_no_pmtu_disc)
214                 inet->pmtudisc = IP_PMTUDISC_DONT;
215         else
216                 inet->pmtudisc = IP_PMTUDISC_WANT;
217         /*
218          * Increment only the relevant sk_prot->socks debug field, this changes
219          * the previous behaviour of incrementing both the equivalent to
220          * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
221          *
222          * This allows better debug granularity as we'll know exactly how many
223          * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
224          * transport protocol socks. -acme
225          */
226         sk_refcnt_debug_inc(sk);
227 
228         if (inet->inet_num) {
229                 /* It assumes that any protocol which allows
230                  * the user to assign a number at socket
231                  * creation time automatically shares.
232                  */
233                 inet->inet_sport = htons(inet->inet_num);
234                 sk->sk_prot->hash(sk);
235         }
236         if (sk->sk_prot->init) {
237                 err = sk->sk_prot->init(sk);
238                 if (err) {
239                         sk_common_release(sk);
240                         goto out;
241                 }
242         }
243 out:
244         return err;
245 out_rcu_unlock:
246         rcu_read_unlock();
247         goto out;
248 }
249 
250 
251 /* bind for INET6 API */
252 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
253 {
254         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
255         struct sock *sk = sock->sk;
256         struct inet_sock *inet = inet_sk(sk);
257         struct ipv6_pinfo *np = inet6_sk(sk);
258         struct net *net = sock_net(sk);
259         __be32 v4addr = 0;
260         unsigned short snum;
261         int addr_type = 0;
262         int err = 0;
263 
264         /* If the socket has its own bind function then use it. */
265         if (sk->sk_prot->bind)
266                 return sk->sk_prot->bind(sk, uaddr, addr_len);
267 
268         if (addr_len < SIN6_LEN_RFC2133)
269                 return -EINVAL;
270 
271         if (addr->sin6_family != AF_INET6)
272                 return -EAFNOSUPPORT;
273 
274         addr_type = ipv6_addr_type(&addr->sin6_addr);
275         if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
276                 return -EINVAL;
277 
278         snum = ntohs(addr->sin6_port);
279         if (snum && snum < PROT_SOCK && !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
280                 return -EACCES;
281 
282         lock_sock(sk);
283 
284         /* Check these errors (active socket, double bind). */
285         if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
286                 err = -EINVAL;
287                 goto out;
288         }
289 
290         /* Check if the address belongs to the host. */
291         if (addr_type == IPV6_ADDR_MAPPED) {
292                 int chk_addr_ret;
293 
294                 /* Binding to v4-mapped address on a v6-only socket
295                  * makes no sense
296                  */
297                 if (sk->sk_ipv6only) {
298                         err = -EINVAL;
299                         goto out;
300                 }
301 
302                 /* Reproduce AF_INET checks to make the bindings consistent */
303                 v4addr = addr->sin6_addr.s6_addr32[3];
304                 chk_addr_ret = inet_addr_type(net, v4addr);
305                 if (!net->ipv4.sysctl_ip_nonlocal_bind &&
306                     !(inet->freebind || inet->transparent) &&
307                     v4addr != htonl(INADDR_ANY) &&
308                     chk_addr_ret != RTN_LOCAL &&
309                     chk_addr_ret != RTN_MULTICAST &&
310                     chk_addr_ret != RTN_BROADCAST) {
311                         err = -EADDRNOTAVAIL;
312                         goto out;
313                 }
314         } else {
315                 if (addr_type != IPV6_ADDR_ANY) {
316                         struct net_device *dev = NULL;
317 
318                         rcu_read_lock();
319                         if (__ipv6_addr_needs_scope_id(addr_type)) {
320                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
321                                     addr->sin6_scope_id) {
322                                         /* Override any existing binding, if another one
323                                          * is supplied by user.
324                                          */
325                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
326                                 }
327 
328                                 /* Binding to link-local address requires an interface */
329                                 if (!sk->sk_bound_dev_if) {
330                                         err = -EINVAL;
331                                         goto out_unlock;
332                                 }
333                                 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
334                                 if (!dev) {
335                                         err = -ENODEV;
336                                         goto out_unlock;
337                                 }
338                         }
339 
340                         /* ipv4 addr of the socket is invalid.  Only the
341                          * unspecified and mapped address have a v4 equivalent.
342                          */
343                         v4addr = LOOPBACK4_IPV6;
344                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
345                                 if (!(inet->freebind || inet->transparent) &&
346                                     !ipv6_chk_addr(net, &addr->sin6_addr,
347                                                    dev, 0)) {
348                                         err = -EADDRNOTAVAIL;
349                                         goto out_unlock;
350                                 }
351                         }
352                         rcu_read_unlock();
353                 }
354         }
355 
356         inet->inet_rcv_saddr = v4addr;
357         inet->inet_saddr = v4addr;
358 
359         sk->sk_v6_rcv_saddr = addr->sin6_addr;
360 
361         if (!(addr_type & IPV6_ADDR_MULTICAST))
362                 np->saddr = addr->sin6_addr;
363 
364         /* Make sure we are allowed to bind here. */
365         if ((snum || !inet->bind_address_no_port) &&
366             sk->sk_prot->get_port(sk, snum)) {
367                 inet_reset_saddr(sk);
368                 err = -EADDRINUSE;
369                 goto out;
370         }
371 
372         if (addr_type != IPV6_ADDR_ANY) {
373                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
374                 if (addr_type != IPV6_ADDR_MAPPED)
375                         sk->sk_ipv6only = 1;
376         }
377         if (snum)
378                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
379         inet->inet_sport = htons(inet->inet_num);
380         inet->inet_dport = 0;
381         inet->inet_daddr = 0;
382 out:
383         release_sock(sk);
384         return err;
385 out_unlock:
386         rcu_read_unlock();
387         goto out;
388 }
389 EXPORT_SYMBOL(inet6_bind);
390 
391 int inet6_release(struct socket *sock)
392 {
393         struct sock *sk = sock->sk;
394 
395         if (!sk)
396                 return -EINVAL;
397 
398         /* Free mc lists */
399         ipv6_sock_mc_close(sk);
400 
401         /* Free ac lists */
402         ipv6_sock_ac_close(sk);
403 
404         return inet_release(sock);
405 }
406 EXPORT_SYMBOL(inet6_release);
407 
408 void inet6_destroy_sock(struct sock *sk)
409 {
410         struct ipv6_pinfo *np = inet6_sk(sk);
411         struct sk_buff *skb;
412         struct ipv6_txoptions *opt;
413 
414         /* Release rx options */
415 
416         skb = xchg(&np->pktoptions, NULL);
417         if (skb)
418                 kfree_skb(skb);
419 
420         skb = xchg(&np->rxpmtu, NULL);
421         if (skb)
422                 kfree_skb(skb);
423 
424         /* Free flowlabels */
425         fl6_free_socklist(sk);
426 
427         /* Free tx options */
428 
429         opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL);
430         if (opt) {
431                 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
432                 txopt_put(opt);
433         }
434 }
435 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
436 
437 /*
438  *      This does both peername and sockname.
439  */
440 
441 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
442                  int *uaddr_len, int peer)
443 {
444         struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
445         struct sock *sk = sock->sk;
446         struct inet_sock *inet = inet_sk(sk);
447         struct ipv6_pinfo *np = inet6_sk(sk);
448 
449         sin->sin6_family = AF_INET6;
450         sin->sin6_flowinfo = 0;
451         sin->sin6_scope_id = 0;
452         if (peer) {
453                 if (!inet->inet_dport)
454                         return -ENOTCONN;
455                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
456                     peer == 1)
457                         return -ENOTCONN;
458                 sin->sin6_port = inet->inet_dport;
459                 sin->sin6_addr = sk->sk_v6_daddr;
460                 if (np->sndflow)
461                         sin->sin6_flowinfo = np->flow_label;
462         } else {
463                 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
464                         sin->sin6_addr = np->saddr;
465                 else
466                         sin->sin6_addr = sk->sk_v6_rcv_saddr;
467 
468                 sin->sin6_port = inet->inet_sport;
469         }
470         sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
471                                                  sk->sk_bound_dev_if);
472         *uaddr_len = sizeof(*sin);
473         return 0;
474 }
475 EXPORT_SYMBOL(inet6_getname);
476 
477 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
478 {
479         struct sock *sk = sock->sk;
480         struct net *net = sock_net(sk);
481 
482         switch (cmd) {
483         case SIOCGSTAMP:
484                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
485 
486         case SIOCGSTAMPNS:
487                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
488 
489         case SIOCADDRT:
490         case SIOCDELRT:
491 
492                 return ipv6_route_ioctl(net, cmd, (void __user *)arg);
493 
494         case SIOCSIFADDR:
495                 return addrconf_add_ifaddr(net, (void __user *) arg);
496         case SIOCDIFADDR:
497                 return addrconf_del_ifaddr(net, (void __user *) arg);
498         case SIOCSIFDSTADDR:
499                 return addrconf_set_dstaddr(net, (void __user *) arg);
500         default:
501                 if (!sk->sk_prot->ioctl)
502                         return -ENOIOCTLCMD;
503                 return sk->sk_prot->ioctl(sk, cmd, arg);
504         }
505         /*NOTREACHED*/
506         return 0;
507 }
508 EXPORT_SYMBOL(inet6_ioctl);
509 
510 const struct proto_ops inet6_stream_ops = {
511         .family            = PF_INET6,
512         .owner             = THIS_MODULE,
513         .release           = inet6_release,
514         .bind              = inet6_bind,
515         .connect           = inet_stream_connect,       /* ok           */
516         .socketpair        = sock_no_socketpair,        /* a do nothing */
517         .accept            = inet_accept,               /* ok           */
518         .getname           = inet6_getname,
519         .poll              = tcp_poll,                  /* ok           */
520         .ioctl             = inet6_ioctl,               /* must change  */
521         .listen            = inet_listen,               /* ok           */
522         .shutdown          = inet_shutdown,             /* ok           */
523         .setsockopt        = sock_common_setsockopt,    /* ok           */
524         .getsockopt        = sock_common_getsockopt,    /* ok           */
525         .sendmsg           = inet_sendmsg,              /* ok           */
526         .recvmsg           = inet_recvmsg,              /* ok           */
527         .mmap              = sock_no_mmap,
528         .sendpage          = inet_sendpage,
529         .splice_read       = tcp_splice_read,
530 #ifdef CONFIG_COMPAT
531         .compat_setsockopt = compat_sock_common_setsockopt,
532         .compat_getsockopt = compat_sock_common_getsockopt,
533 #endif
534 };
535 
536 const struct proto_ops inet6_dgram_ops = {
537         .family            = PF_INET6,
538         .owner             = THIS_MODULE,
539         .release           = inet6_release,
540         .bind              = inet6_bind,
541         .connect           = inet_dgram_connect,        /* ok           */
542         .socketpair        = sock_no_socketpair,        /* a do nothing */
543         .accept            = sock_no_accept,            /* a do nothing */
544         .getname           = inet6_getname,
545         .poll              = udp_poll,                  /* ok           */
546         .ioctl             = inet6_ioctl,               /* must change  */
547         .listen            = sock_no_listen,            /* ok           */
548         .shutdown          = inet_shutdown,             /* ok           */
549         .setsockopt        = sock_common_setsockopt,    /* ok           */
550         .getsockopt        = sock_common_getsockopt,    /* ok           */
551         .sendmsg           = inet_sendmsg,              /* ok           */
552         .recvmsg           = inet_recvmsg,              /* ok           */
553         .mmap              = sock_no_mmap,
554         .sendpage          = sock_no_sendpage,
555 #ifdef CONFIG_COMPAT
556         .compat_setsockopt = compat_sock_common_setsockopt,
557         .compat_getsockopt = compat_sock_common_getsockopt,
558 #endif
559 };
560 
561 static const struct net_proto_family inet6_family_ops = {
562         .family = PF_INET6,
563         .create = inet6_create,
564         .owner  = THIS_MODULE,
565 };
566 
567 int inet6_register_protosw(struct inet_protosw *p)
568 {
569         struct list_head *lh;
570         struct inet_protosw *answer;
571         struct list_head *last_perm;
572         int protocol = p->protocol;
573         int ret;
574 
575         spin_lock_bh(&inetsw6_lock);
576 
577         ret = -EINVAL;
578         if (p->type >= SOCK_MAX)
579                 goto out_illegal;
580 
581         /* If we are trying to override a permanent protocol, bail. */
582         answer = NULL;
583         ret = -EPERM;
584         last_perm = &inetsw6[p->type];
585         list_for_each(lh, &inetsw6[p->type]) {
586                 answer = list_entry(lh, struct inet_protosw, list);
587 
588                 /* Check only the non-wild match. */
589                 if (INET_PROTOSW_PERMANENT & answer->flags) {
590                         if (protocol == answer->protocol)
591                                 break;
592                         last_perm = lh;
593                 }
594 
595                 answer = NULL;
596         }
597         if (answer)
598                 goto out_permanent;
599 
600         /* Add the new entry after the last permanent entry if any, so that
601          * the new entry does not override a permanent entry when matched with
602          * a wild-card protocol. But it is allowed to override any existing
603          * non-permanent entry.  This means that when we remove this entry, the
604          * system automatically returns to the old behavior.
605          */
606         list_add_rcu(&p->list, last_perm);
607         ret = 0;
608 out:
609         spin_unlock_bh(&inetsw6_lock);
610         return ret;
611 
612 out_permanent:
613         pr_err("Attempt to override permanent protocol %d\n", protocol);
614         goto out;
615 
616 out_illegal:
617         pr_err("Ignoring attempt to register invalid socket type %d\n",
618                p->type);
619         goto out;
620 }
621 EXPORT_SYMBOL(inet6_register_protosw);
622 
623 void
624 inet6_unregister_protosw(struct inet_protosw *p)
625 {
626         if (INET_PROTOSW_PERMANENT & p->flags) {
627                 pr_err("Attempt to unregister permanent protocol %d\n",
628                        p->protocol);
629         } else {
630                 spin_lock_bh(&inetsw6_lock);
631                 list_del_rcu(&p->list);
632                 spin_unlock_bh(&inetsw6_lock);
633 
634                 synchronize_net();
635         }
636 }
637 EXPORT_SYMBOL(inet6_unregister_protosw);
638 
639 int inet6_sk_rebuild_header(struct sock *sk)
640 {
641         struct ipv6_pinfo *np = inet6_sk(sk);
642         struct dst_entry *dst;
643 
644         dst = __sk_dst_check(sk, np->dst_cookie);
645 
646         if (!dst) {
647                 struct inet_sock *inet = inet_sk(sk);
648                 struct in6_addr *final_p, final;
649                 struct flowi6 fl6;
650 
651                 memset(&fl6, 0, sizeof(fl6));
652                 fl6.flowi6_proto = sk->sk_protocol;
653                 fl6.daddr = sk->sk_v6_daddr;
654                 fl6.saddr = np->saddr;
655                 fl6.flowlabel = np->flow_label;
656                 fl6.flowi6_oif = sk->sk_bound_dev_if;
657                 fl6.flowi6_mark = sk->sk_mark;
658                 fl6.fl6_dport = inet->inet_dport;
659                 fl6.fl6_sport = inet->inet_sport;
660                 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
661 
662                 rcu_read_lock();
663                 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt),
664                                          &final);
665                 rcu_read_unlock();
666 
667                 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
668                 if (IS_ERR(dst)) {
669                         sk->sk_route_caps = 0;
670                         sk->sk_err_soft = -PTR_ERR(dst);
671                         return PTR_ERR(dst);
672                 }
673 
674                 __ip6_dst_store(sk, dst, NULL, NULL);
675         }
676 
677         return 0;
678 }
679 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
680 
681 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
682                        const struct inet6_skb_parm *opt)
683 {
684         const struct ipv6_pinfo *np = inet6_sk(sk);
685 
686         if (np->rxopt.all) {
687                 if ((opt->hop && (np->rxopt.bits.hopopts ||
688                                   np->rxopt.bits.ohopopts)) ||
689                     (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) &&
690                      np->rxopt.bits.rxflow) ||
691                     (opt->srcrt && (np->rxopt.bits.srcrt ||
692                      np->rxopt.bits.osrcrt)) ||
693                     ((opt->dst1 || opt->dst0) &&
694                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
695                         return true;
696         }
697         return false;
698 }
699 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
700 
701 static struct packet_type ipv6_packet_type __read_mostly = {
702         .type = cpu_to_be16(ETH_P_IPV6),
703         .func = ipv6_rcv,
704 };
705 
706 static int __init ipv6_packet_init(void)
707 {
708         dev_add_pack(&ipv6_packet_type);
709         return 0;
710 }
711 
712 static void ipv6_packet_cleanup(void)
713 {
714         dev_remove_pack(&ipv6_packet_type);
715 }
716 
717 static int __net_init ipv6_init_mibs(struct net *net)
718 {
719         int i;
720 
721         net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib);
722         if (!net->mib.udp_stats_in6)
723                 return -ENOMEM;
724         net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib);
725         if (!net->mib.udplite_stats_in6)
726                 goto err_udplite_mib;
727         net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib);
728         if (!net->mib.ipv6_statistics)
729                 goto err_ip_mib;
730 
731         for_each_possible_cpu(i) {
732                 struct ipstats_mib *af_inet6_stats;
733                 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i);
734                 u64_stats_init(&af_inet6_stats->syncp);
735         }
736 
737 
738         net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib);
739         if (!net->mib.icmpv6_statistics)
740                 goto err_icmp_mib;
741         net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
742                                                 GFP_KERNEL);
743         if (!net->mib.icmpv6msg_statistics)
744                 goto err_icmpmsg_mib;
745         return 0;
746 
747 err_icmpmsg_mib:
748         free_percpu(net->mib.icmpv6_statistics);
749 err_icmp_mib:
750         free_percpu(net->mib.ipv6_statistics);
751 err_ip_mib:
752         free_percpu(net->mib.udplite_stats_in6);
753 err_udplite_mib:
754         free_percpu(net->mib.udp_stats_in6);
755         return -ENOMEM;
756 }
757 
758 static void ipv6_cleanup_mibs(struct net *net)
759 {
760         free_percpu(net->mib.udp_stats_in6);
761         free_percpu(net->mib.udplite_stats_in6);
762         free_percpu(net->mib.ipv6_statistics);
763         free_percpu(net->mib.icmpv6_statistics);
764         kfree(net->mib.icmpv6msg_statistics);
765 }
766 
767 static int __net_init inet6_net_init(struct net *net)
768 {
769         int err = 0;
770 
771         net->ipv6.sysctl.bindv6only = 0;
772         net->ipv6.sysctl.icmpv6_time = 1*HZ;
773         net->ipv6.sysctl.flowlabel_consistency = 1;
774         net->ipv6.sysctl.auto_flowlabels = 0;
775         net->ipv6.sysctl.idgen_retries = 3;
776         net->ipv6.sysctl.idgen_delay = 1 * HZ;
777         net->ipv6.sysctl.flowlabel_state_ranges = 1;
778         atomic_set(&net->ipv6.fib6_sernum, 1);
779 
780         err = ipv6_init_mibs(net);
781         if (err)
782                 return err;
783 #ifdef CONFIG_PROC_FS
784         err = udp6_proc_init(net);
785         if (err)
786                 goto out;
787         err = tcp6_proc_init(net);
788         if (err)
789                 goto proc_tcp6_fail;
790         err = ac6_proc_init(net);
791         if (err)
792                 goto proc_ac6_fail;
793 #endif
794         return err;
795 
796 #ifdef CONFIG_PROC_FS
797 proc_ac6_fail:
798         tcp6_proc_exit(net);
799 proc_tcp6_fail:
800         udp6_proc_exit(net);
801 out:
802         ipv6_cleanup_mibs(net);
803         return err;
804 #endif
805 }
806 
807 static void __net_exit inet6_net_exit(struct net *net)
808 {
809 #ifdef CONFIG_PROC_FS
810         udp6_proc_exit(net);
811         tcp6_proc_exit(net);
812         ac6_proc_exit(net);
813 #endif
814         ipv6_cleanup_mibs(net);
815 }
816 
817 static struct pernet_operations inet6_net_ops = {
818         .init = inet6_net_init,
819         .exit = inet6_net_exit,
820 };
821 
822 static const struct ipv6_stub ipv6_stub_impl = {
823         .ipv6_sock_mc_join = ipv6_sock_mc_join,
824         .ipv6_sock_mc_drop = ipv6_sock_mc_drop,
825         .ipv6_dst_lookup = ip6_dst_lookup,
826         .udpv6_encap_enable = udpv6_encap_enable,
827         .ndisc_send_na = ndisc_send_na,
828         .nd_tbl = &nd_tbl,
829 };
830 
831 static int __init inet6_init(void)
832 {
833         struct list_head *r;
834         int err = 0;
835 
836         sock_skb_cb_check_size(sizeof(struct inet6_skb_parm));
837 
838         /* Register the socket-side information for inet6_create.  */
839         for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
840                 INIT_LIST_HEAD(r);
841 
842         if (disable_ipv6_mod) {
843                 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
844                 goto out;
845         }
846 
847         err = proto_register(&tcpv6_prot, 1);
848         if (err)
849                 goto out;
850 
851         err = proto_register(&udpv6_prot, 1);
852         if (err)
853                 goto out_unregister_tcp_proto;
854 
855         err = proto_register(&udplitev6_prot, 1);
856         if (err)
857                 goto out_unregister_udp_proto;
858 
859         err = proto_register(&rawv6_prot, 1);
860         if (err)
861                 goto out_unregister_udplite_proto;
862 
863         err = proto_register(&pingv6_prot, 1);
864         if (err)
865                 goto out_unregister_ping_proto;
866 
867         /* We MUST register RAW sockets before we create the ICMP6,
868          * IGMP6, or NDISC control sockets.
869          */
870         err = rawv6_init();
871         if (err)
872                 goto out_unregister_raw_proto;
873 
874         /* Register the family here so that the init calls below will
875          * be able to create sockets. (?? is this dangerous ??)
876          */
877         err = sock_register(&inet6_family_ops);
878         if (err)
879                 goto out_sock_register_fail;
880 
881         /*
882          *      ipngwg API draft makes clear that the correct semantics
883          *      for TCP and UDP is to consider one TCP and UDP instance
884          *      in a host available by both INET and INET6 APIs and
885          *      able to communicate via both network protocols.
886          */
887 
888         err = register_pernet_subsys(&inet6_net_ops);
889         if (err)
890                 goto register_pernet_fail;
891         err = icmpv6_init();
892         if (err)
893                 goto icmp_fail;
894         err = ip6_mr_init();
895         if (err)
896                 goto ipmr_fail;
897         err = ndisc_init();
898         if (err)
899                 goto ndisc_fail;
900         err = igmp6_init();
901         if (err)
902                 goto igmp_fail;
903 
904         ipv6_stub = &ipv6_stub_impl;
905 
906         err = ipv6_netfilter_init();
907         if (err)
908                 goto netfilter_fail;
909         /* Create /proc/foo6 entries. */
910 #ifdef CONFIG_PROC_FS
911         err = -ENOMEM;
912         if (raw6_proc_init())
913                 goto proc_raw6_fail;
914         if (udplite6_proc_init())
915                 goto proc_udplite6_fail;
916         if (ipv6_misc_proc_init())
917                 goto proc_misc6_fail;
918         if (if6_proc_init())
919                 goto proc_if6_fail;
920 #endif
921         err = ip6_route_init();
922         if (err)
923                 goto ip6_route_fail;
924         err = ndisc_late_init();
925         if (err)
926                 goto ndisc_late_fail;
927         err = ip6_flowlabel_init();
928         if (err)
929                 goto ip6_flowlabel_fail;
930         err = addrconf_init();
931         if (err)
932                 goto addrconf_fail;
933 
934         /* Init v6 extension headers. */
935         err = ipv6_exthdrs_init();
936         if (err)
937                 goto ipv6_exthdrs_fail;
938 
939         err = ipv6_frag_init();
940         if (err)
941                 goto ipv6_frag_fail;
942 
943         /* Init v6 transport protocols. */
944         err = udpv6_init();
945         if (err)
946                 goto udpv6_fail;
947 
948         err = udplitev6_init();
949         if (err)
950                 goto udplitev6_fail;
951 
952         err = tcpv6_init();
953         if (err)
954                 goto tcpv6_fail;
955 
956         err = ipv6_packet_init();
957         if (err)
958                 goto ipv6_packet_fail;
959 
960         err = pingv6_init();
961         if (err)
962                 goto pingv6_fail;
963 
964 #ifdef CONFIG_SYSCTL
965         err = ipv6_sysctl_register();
966         if (err)
967                 goto sysctl_fail;
968 #endif
969 out:
970         return err;
971 
972 #ifdef CONFIG_SYSCTL
973 sysctl_fail:
974         pingv6_exit();
975 #endif
976 pingv6_fail:
977         ipv6_packet_cleanup();
978 ipv6_packet_fail:
979         tcpv6_exit();
980 tcpv6_fail:
981         udplitev6_exit();
982 udplitev6_fail:
983         udpv6_exit();
984 udpv6_fail:
985         ipv6_frag_exit();
986 ipv6_frag_fail:
987         ipv6_exthdrs_exit();
988 ipv6_exthdrs_fail:
989         addrconf_cleanup();
990 addrconf_fail:
991         ip6_flowlabel_cleanup();
992 ip6_flowlabel_fail:
993         ndisc_late_cleanup();
994 ndisc_late_fail:
995         ip6_route_cleanup();
996 ip6_route_fail:
997 #ifdef CONFIG_PROC_FS
998         if6_proc_exit();
999 proc_if6_fail:
1000         ipv6_misc_proc_exit();
1001 proc_misc6_fail:
1002         udplite6_proc_exit();
1003 proc_udplite6_fail:
1004         raw6_proc_exit();
1005 proc_raw6_fail:
1006 #endif
1007         ipv6_netfilter_fini();
1008 netfilter_fail:
1009         igmp6_cleanup();
1010 igmp_fail:
1011         ndisc_cleanup();
1012 ndisc_fail:
1013         ip6_mr_cleanup();
1014 ipmr_fail:
1015         icmpv6_cleanup();
1016 icmp_fail:
1017         unregister_pernet_subsys(&inet6_net_ops);
1018 register_pernet_fail:
1019         sock_unregister(PF_INET6);
1020         rtnl_unregister_all(PF_INET6);
1021 out_sock_register_fail:
1022         rawv6_exit();
1023 out_unregister_ping_proto:
1024         proto_unregister(&pingv6_prot);
1025 out_unregister_raw_proto:
1026         proto_unregister(&rawv6_prot);
1027 out_unregister_udplite_proto:
1028         proto_unregister(&udplitev6_prot);
1029 out_unregister_udp_proto:
1030         proto_unregister(&udpv6_prot);
1031 out_unregister_tcp_proto:
1032         proto_unregister(&tcpv6_prot);
1033         goto out;
1034 }
1035 module_init(inet6_init);
1036 
1037 MODULE_ALIAS_NETPROTO(PF_INET6);
1038 

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