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

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