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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);
174         if (!sk)
175                 goto out;
176 
177         sock_init_data(sock, sk);
178 
179         err = 0;
180         if (INET_PROTOSW_REUSE & answer_flags)
181                 sk->sk_reuse = SK_CAN_REUSE;
182 
183         inet = inet_sk(sk);
184         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
185 
186         if (SOCK_RAW == sock->type) {
187                 inet->inet_num = protocol;
188                 if (IPPROTO_RAW == protocol)
189                         inet->hdrincl = 1;
190         }
191 
192         sk->sk_destruct         = inet_sock_destruct;
193         sk->sk_family           = PF_INET6;
194         sk->sk_protocol         = protocol;
195 
196         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
197 
198         inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
199         np->hop_limit   = -1;
200         np->mcast_hops  = IPV6_DEFAULT_MCASTHOPS;
201         np->mc_loop     = 1;
202         np->pmtudisc    = IPV6_PMTUDISC_WANT;
203         sk->sk_ipv6only = net->ipv6.sysctl.bindv6only;
204 
205         /* Init the ipv4 part of the socket since we can have sockets
206          * using v6 API for ipv4.
207          */
208         inet->uc_ttl    = -1;
209 
210         inet->mc_loop   = 1;
211         inet->mc_ttl    = 1;
212         inet->mc_index  = 0;
213         inet->mc_list   = NULL;
214         inet->rcv_tos   = 0;
215 
216         if (net->ipv4.sysctl_ip_no_pmtu_disc)
217                 inet->pmtudisc = IP_PMTUDISC_DONT;
218         else
219                 inet->pmtudisc = IP_PMTUDISC_WANT;
220         /*
221          * Increment only the relevant sk_prot->socks debug field, this changes
222          * the previous behaviour of incrementing both the equivalent to
223          * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
224          *
225          * This allows better debug granularity as we'll know exactly how many
226          * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
227          * transport protocol socks. -acme
228          */
229         sk_refcnt_debug_inc(sk);
230 
231         if (inet->inet_num) {
232                 /* It assumes that any protocol which allows
233                  * the user to assign a number at socket
234                  * creation time automatically shares.
235                  */
236                 inet->inet_sport = htons(inet->inet_num);
237                 sk->sk_prot->hash(sk);
238         }
239         if (sk->sk_prot->init) {
240                 err = sk->sk_prot->init(sk);
241                 if (err) {
242                         sk_common_release(sk);
243                         goto out;
244                 }
245         }
246 out:
247         return err;
248 out_rcu_unlock:
249         rcu_read_unlock();
250         goto out;
251 }
252 
253 
254 /* bind for INET6 API */
255 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
256 {
257         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
258         struct sock *sk = sock->sk;
259         struct inet_sock *inet = inet_sk(sk);
260         struct ipv6_pinfo *np = inet6_sk(sk);
261         struct net *net = sock_net(sk);
262         __be32 v4addr = 0;
263         unsigned short snum;
264         int addr_type = 0;
265         int err = 0;
266 
267         /* If the socket has its own bind function then use it. */
268         if (sk->sk_prot->bind)
269                 return sk->sk_prot->bind(sk, uaddr, addr_len);
270 
271         if (addr_len < SIN6_LEN_RFC2133)
272                 return -EINVAL;
273 
274         if (addr->sin6_family != AF_INET6)
275                 return -EAFNOSUPPORT;
276 
277         addr_type = ipv6_addr_type(&addr->sin6_addr);
278         if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
279                 return -EINVAL;
280 
281         snum = ntohs(addr->sin6_port);
282         if (snum && snum < PROT_SOCK && !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
283                 return -EACCES;
284 
285         lock_sock(sk);
286 
287         /* Check these errors (active socket, double bind). */
288         if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
289                 err = -EINVAL;
290                 goto out;
291         }
292 
293         /* Check if the address belongs to the host. */
294         if (addr_type == IPV6_ADDR_MAPPED) {
295                 int chk_addr_ret;
296 
297                 /* Binding to v4-mapped address on a v6-only socket
298                  * makes no sense
299                  */
300                 if (sk->sk_ipv6only) {
301                         err = -EINVAL;
302                         goto out;
303                 }
304 
305                 /* Reproduce AF_INET checks to make the bindings consistent */
306                 v4addr = addr->sin6_addr.s6_addr32[3];
307                 chk_addr_ret = inet_addr_type(net, v4addr);
308                 if (!net->ipv4.sysctl_ip_nonlocal_bind &&
309                     !(inet->freebind || inet->transparent) &&
310                     v4addr != htonl(INADDR_ANY) &&
311                     chk_addr_ret != RTN_LOCAL &&
312                     chk_addr_ret != RTN_MULTICAST &&
313                     chk_addr_ret != RTN_BROADCAST) {
314                         err = -EADDRNOTAVAIL;
315                         goto out;
316                 }
317         } else {
318                 if (addr_type != IPV6_ADDR_ANY) {
319                         struct net_device *dev = NULL;
320 
321                         rcu_read_lock();
322                         if (__ipv6_addr_needs_scope_id(addr_type)) {
323                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
324                                     addr->sin6_scope_id) {
325                                         /* Override any existing binding, if another one
326                                          * is supplied by user.
327                                          */
328                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
329                                 }
330 
331                                 /* Binding to link-local address requires an interface */
332                                 if (!sk->sk_bound_dev_if) {
333                                         err = -EINVAL;
334                                         goto out_unlock;
335                                 }
336                                 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
337                                 if (!dev) {
338                                         err = -ENODEV;
339                                         goto out_unlock;
340                                 }
341                         }
342 
343                         /* ipv4 addr of the socket is invalid.  Only the
344                          * unspecified and mapped address have a v4 equivalent.
345                          */
346                         v4addr = LOOPBACK4_IPV6;
347                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
348                                 if (!(inet->freebind || inet->transparent) &&
349                                     !ipv6_chk_addr(net, &addr->sin6_addr,
350                                                    dev, 0)) {
351                                         err = -EADDRNOTAVAIL;
352                                         goto out_unlock;
353                                 }
354                         }
355                         rcu_read_unlock();
356                 }
357         }
358 
359         inet->inet_rcv_saddr = v4addr;
360         inet->inet_saddr = v4addr;
361 
362         sk->sk_v6_rcv_saddr = addr->sin6_addr;
363 
364         if (!(addr_type & IPV6_ADDR_MULTICAST))
365                 np->saddr = addr->sin6_addr;
366 
367         /* Make sure we are allowed to bind here. */
368         if (sk->sk_prot->get_port(sk, snum)) {
369                 inet_reset_saddr(sk);
370                 err = -EADDRINUSE;
371                 goto out;
372         }
373 
374         if (addr_type != IPV6_ADDR_ANY) {
375                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
376                 if (addr_type != IPV6_ADDR_MAPPED)
377                         sk->sk_ipv6only = 1;
378         }
379         if (snum)
380                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
381         inet->inet_sport = htons(inet->inet_num);
382         inet->inet_dport = 0;
383         inet->inet_daddr = 0;
384 out:
385         release_sock(sk);
386         return err;
387 out_unlock:
388         rcu_read_unlock();
389         goto out;
390 }
391 EXPORT_SYMBOL(inet6_bind);
392 
393 int inet6_release(struct socket *sock)
394 {
395         struct sock *sk = sock->sk;
396 
397         if (!sk)
398                 return -EINVAL;
399 
400         /* Free mc lists */
401         ipv6_sock_mc_close(sk);
402 
403         /* Free ac lists */
404         ipv6_sock_ac_close(sk);
405 
406         return inet_release(sock);
407 }
408 EXPORT_SYMBOL(inet6_release);
409 
410 void inet6_destroy_sock(struct sock *sk)
411 {
412         struct ipv6_pinfo *np = inet6_sk(sk);
413         struct sk_buff *skb;
414         struct ipv6_txoptions *opt;
415 
416         /* Release rx options */
417 
418         skb = xchg(&np->pktoptions, NULL);
419         if (skb)
420                 kfree_skb(skb);
421 
422         skb = xchg(&np->rxpmtu, NULL);
423         if (skb)
424                 kfree_skb(skb);
425 
426         /* Free flowlabels */
427         fl6_free_socklist(sk);
428 
429         /* Free tx options */
430 
431         opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL);
432         if (opt) {
433                 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
434                 txopt_put(opt);
435         }
436 }
437 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
438 
439 /*
440  *      This does both peername and sockname.
441  */
442 
443 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
444                  int *uaddr_len, int peer)
445 {
446         struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
447         struct sock *sk = sock->sk;
448         struct inet_sock *inet = inet_sk(sk);
449         struct ipv6_pinfo *np = inet6_sk(sk);
450 
451         sin->sin6_family = AF_INET6;
452         sin->sin6_flowinfo = 0;
453         sin->sin6_scope_id = 0;
454         if (peer) {
455                 if (!inet->inet_dport)
456                         return -ENOTCONN;
457                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
458                     peer == 1)
459                         return -ENOTCONN;
460                 sin->sin6_port = inet->inet_dport;
461                 sin->sin6_addr = sk->sk_v6_daddr;
462                 if (np->sndflow)
463                         sin->sin6_flowinfo = np->flow_label;
464         } else {
465                 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
466                         sin->sin6_addr = np->saddr;
467                 else
468                         sin->sin6_addr = sk->sk_v6_rcv_saddr;
469 
470                 sin->sin6_port = inet->inet_sport;
471         }
472         sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
473                                                  sk->sk_bound_dev_if);
474         *uaddr_len = sizeof(*sin);
475         return 0;
476 }
477 EXPORT_SYMBOL(inet6_getname);
478 
479 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
480 {
481         struct sock *sk = sock->sk;
482         struct net *net = sock_net(sk);
483 
484         switch (cmd) {
485         case SIOCGSTAMP:
486                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
487 
488         case SIOCGSTAMPNS:
489                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
490 
491         case SIOCADDRT:
492         case SIOCDELRT:
493 
494                 return ipv6_route_ioctl(net, cmd, (void __user *)arg);
495 
496         case SIOCSIFADDR:
497                 return addrconf_add_ifaddr(net, (void __user *) arg);
498         case SIOCDIFADDR:
499                 return addrconf_del_ifaddr(net, (void __user *) arg);
500         case SIOCSIFDSTADDR:
501                 return addrconf_set_dstaddr(net, (void __user *) arg);
502         default:
503                 if (!sk->sk_prot->ioctl)
504                         return -ENOIOCTLCMD;
505                 return sk->sk_prot->ioctl(sk, cmd, arg);
506         }
507         /*NOTREACHED*/
508         return 0;
509 }
510 EXPORT_SYMBOL(inet6_ioctl);
511 
512 const struct proto_ops inet6_stream_ops = {
513         .family            = PF_INET6,
514         .owner             = THIS_MODULE,
515         .release           = inet6_release,
516         .bind              = inet6_bind,
517         .connect           = inet_stream_connect,       /* ok           */
518         .socketpair        = sock_no_socketpair,        /* a do nothing */
519         .accept            = inet_accept,               /* ok           */
520         .getname           = inet6_getname,
521         .poll              = tcp_poll,                  /* ok           */
522         .ioctl             = inet6_ioctl,               /* must change  */
523         .listen            = inet_listen,               /* ok           */
524         .shutdown          = inet_shutdown,             /* ok           */
525         .setsockopt        = sock_common_setsockopt,    /* ok           */
526         .getsockopt        = sock_common_getsockopt,    /* ok           */
527         .sendmsg           = inet_sendmsg,              /* ok           */
528         .recvmsg           = inet_recvmsg,              /* ok           */
529         .mmap              = sock_no_mmap,
530         .sendpage          = inet_sendpage,
531         .splice_read       = tcp_splice_read,
532 #ifdef CONFIG_COMPAT
533         .compat_setsockopt = compat_sock_common_setsockopt,
534         .compat_getsockopt = compat_sock_common_getsockopt,
535 #endif
536 };
537 
538 const struct proto_ops inet6_dgram_ops = {
539         .family            = PF_INET6,
540         .owner             = THIS_MODULE,
541         .release           = inet6_release,
542         .bind              = inet6_bind,
543         .connect           = inet_dgram_connect,        /* ok           */
544         .socketpair        = sock_no_socketpair,        /* a do nothing */
545         .accept            = sock_no_accept,            /* a do nothing */
546         .getname           = inet6_getname,
547         .poll              = udp_poll,                  /* ok           */
548         .ioctl             = inet6_ioctl,               /* must change  */
549         .listen            = sock_no_listen,            /* ok           */
550         .shutdown          = inet_shutdown,             /* ok           */
551         .setsockopt        = sock_common_setsockopt,    /* ok           */
552         .getsockopt        = sock_common_getsockopt,    /* ok           */
553         .sendmsg           = inet_sendmsg,              /* ok           */
554         .recvmsg           = inet_recvmsg,              /* ok           */
555         .mmap              = sock_no_mmap,
556         .sendpage          = sock_no_sendpage,
557 #ifdef CONFIG_COMPAT
558         .compat_setsockopt = compat_sock_common_setsockopt,
559         .compat_getsockopt = compat_sock_common_getsockopt,
560 #endif
561 };
562 
563 static const struct net_proto_family inet6_family_ops = {
564         .family = PF_INET6,
565         .create = inet6_create,
566         .owner  = THIS_MODULE,
567 };
568 
569 int inet6_register_protosw(struct inet_protosw *p)
570 {
571         struct list_head *lh;
572         struct inet_protosw *answer;
573         struct list_head *last_perm;
574         int protocol = p->protocol;
575         int ret;
576 
577         spin_lock_bh(&inetsw6_lock);
578 
579         ret = -EINVAL;
580         if (p->type >= SOCK_MAX)
581                 goto out_illegal;
582 
583         /* If we are trying to override a permanent protocol, bail. */
584         answer = NULL;
585         ret = -EPERM;
586         last_perm = &inetsw6[p->type];
587         list_for_each(lh, &inetsw6[p->type]) {
588                 answer = list_entry(lh, struct inet_protosw, list);
589 
590                 /* Check only the non-wild match. */
591                 if (INET_PROTOSW_PERMANENT & answer->flags) {
592                         if (protocol == answer->protocol)
593                                 break;
594                         last_perm = lh;
595                 }
596 
597                 answer = NULL;
598         }
599         if (answer)
600                 goto out_permanent;
601 
602         /* Add the new entry after the last permanent entry if any, so that
603          * the new entry does not override a permanent entry when matched with
604          * a wild-card protocol. But it is allowed to override any existing
605          * non-permanent entry.  This means that when we remove this entry, the
606          * system automatically returns to the old behavior.
607          */
608         list_add_rcu(&p->list, last_perm);
609         ret = 0;
610 out:
611         spin_unlock_bh(&inetsw6_lock);
612         return ret;
613 
614 out_permanent:
615         pr_err("Attempt to override permanent protocol %d\n", protocol);
616         goto out;
617 
618 out_illegal:
619         pr_err("Ignoring attempt to register invalid socket type %d\n",
620                p->type);
621         goto out;
622 }
623 EXPORT_SYMBOL(inet6_register_protosw);
624 
625 void
626 inet6_unregister_protosw(struct inet_protosw *p)
627 {
628         if (INET_PROTOSW_PERMANENT & p->flags) {
629                 pr_err("Attempt to unregister permanent protocol %d\n",
630                        p->protocol);
631         } else {
632                 spin_lock_bh(&inetsw6_lock);
633                 list_del_rcu(&p->list);
634                 spin_unlock_bh(&inetsw6_lock);
635 
636                 synchronize_net();
637         }
638 }
639 EXPORT_SYMBOL(inet6_unregister_protosw);
640 
641 int inet6_sk_rebuild_header(struct sock *sk)
642 {
643         struct ipv6_pinfo *np = inet6_sk(sk);
644         struct dst_entry *dst;
645 
646         dst = __sk_dst_check(sk, np->dst_cookie);
647 
648         if (!dst) {
649                 struct inet_sock *inet = inet_sk(sk);
650                 struct in6_addr *final_p, final;
651                 struct flowi6 fl6;
652 
653                 memset(&fl6, 0, sizeof(fl6));
654                 fl6.flowi6_proto = sk->sk_protocol;
655                 fl6.daddr = sk->sk_v6_daddr;
656                 fl6.saddr = np->saddr;
657                 fl6.flowlabel = np->flow_label;
658                 fl6.flowi6_oif = sk->sk_bound_dev_if;
659                 fl6.flowi6_mark = sk->sk_mark;
660                 fl6.fl6_dport = inet->inet_dport;
661                 fl6.fl6_sport = inet->inet_sport;
662                 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
663 
664                 rcu_read_lock();
665                 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt),
666                                          &final);
667                 rcu_read_unlock();
668 
669                 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
670                 if (IS_ERR(dst)) {
671                         sk->sk_route_caps = 0;
672                         sk->sk_err_soft = -PTR_ERR(dst);
673                         return PTR_ERR(dst);
674                 }
675 
676                 __ip6_dst_store(sk, dst, NULL, NULL);
677         }
678 
679         return 0;
680 }
681 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
682 
683 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
684                        const struct inet6_skb_parm *opt)
685 {
686         const struct ipv6_pinfo *np = inet6_sk(sk);
687 
688         if (np->rxopt.all) {
689                 if ((opt->hop && (np->rxopt.bits.hopopts ||
690                                   np->rxopt.bits.ohopopts)) ||
691                     (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) &&
692                      np->rxopt.bits.rxflow) ||
693                     (opt->srcrt && (np->rxopt.bits.srcrt ||
694                      np->rxopt.bits.osrcrt)) ||
695                     ((opt->dst1 || opt->dst0) &&
696                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
697                         return true;
698         }
699         return false;
700 }
701 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
702 
703 static struct packet_type ipv6_packet_type __read_mostly = {
704         .type = cpu_to_be16(ETH_P_IPV6),
705         .func = ipv6_rcv,
706 };
707 
708 static int __init ipv6_packet_init(void)
709 {
710         dev_add_pack(&ipv6_packet_type);
711         return 0;
712 }
713 
714 static void ipv6_packet_cleanup(void)
715 {
716         dev_remove_pack(&ipv6_packet_type);
717 }
718 
719 static int __net_init ipv6_init_mibs(struct net *net)
720 {
721         int i;
722 
723         net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib);
724         if (!net->mib.udp_stats_in6)
725                 return -ENOMEM;
726         net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib);
727         if (!net->mib.udplite_stats_in6)
728                 goto err_udplite_mib;
729         net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib);
730         if (!net->mib.ipv6_statistics)
731                 goto err_ip_mib;
732 
733         for_each_possible_cpu(i) {
734                 struct ipstats_mib *af_inet6_stats;
735                 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i);
736                 u64_stats_init(&af_inet6_stats->syncp);
737         }
738 
739 
740         net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib);
741         if (!net->mib.icmpv6_statistics)
742                 goto err_icmp_mib;
743         net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
744                                                 GFP_KERNEL);
745         if (!net->mib.icmpv6msg_statistics)
746                 goto err_icmpmsg_mib;
747         return 0;
748 
749 err_icmpmsg_mib:
750         free_percpu(net->mib.icmpv6_statistics);
751 err_icmp_mib:
752         free_percpu(net->mib.ipv6_statistics);
753 err_ip_mib:
754         free_percpu(net->mib.udplite_stats_in6);
755 err_udplite_mib:
756         free_percpu(net->mib.udp_stats_in6);
757         return -ENOMEM;
758 }
759 
760 static void ipv6_cleanup_mibs(struct net *net)
761 {
762         free_percpu(net->mib.udp_stats_in6);
763         free_percpu(net->mib.udplite_stats_in6);
764         free_percpu(net->mib.ipv6_statistics);
765         free_percpu(net->mib.icmpv6_statistics);
766         kfree(net->mib.icmpv6msg_statistics);
767 }
768 
769 static int __net_init inet6_net_init(struct net *net)
770 {
771         int err = 0;
772 
773         net->ipv6.sysctl.bindv6only = 0;
774         net->ipv6.sysctl.icmpv6_time = 1*HZ;
775         net->ipv6.sysctl.flowlabel_consistency = 1;
776         net->ipv6.sysctl.auto_flowlabels = 0;
777         net->ipv6.sysctl.idgen_retries = 3;
778         net->ipv6.sysctl.idgen_delay = 1 * HZ;
779         atomic_set(&net->ipv6.fib6_sernum, 1);
780 
781         err = ipv6_init_mibs(net);
782         if (err)
783                 return err;
784 #ifdef CONFIG_PROC_FS
785         err = udp6_proc_init(net);
786         if (err)
787                 goto out;
788         err = tcp6_proc_init(net);
789         if (err)
790                 goto proc_tcp6_fail;
791         err = ac6_proc_init(net);
792         if (err)
793                 goto proc_ac6_fail;
794 #endif
795         return err;
796 
797 #ifdef CONFIG_PROC_FS
798 proc_ac6_fail:
799         tcp6_proc_exit(net);
800 proc_tcp6_fail:
801         udp6_proc_exit(net);
802 out:
803         ipv6_cleanup_mibs(net);
804         return err;
805 #endif
806 }
807 
808 static void __net_exit inet6_net_exit(struct net *net)
809 {
810 #ifdef CONFIG_PROC_FS
811         udp6_proc_exit(net);
812         tcp6_proc_exit(net);
813         ac6_proc_exit(net);
814 #endif
815         ipv6_cleanup_mibs(net);
816 }
817 
818 static struct pernet_operations inet6_net_ops = {
819         .init = inet6_net_init,
820         .exit = inet6_net_exit,
821 };
822 
823 static const struct ipv6_stub ipv6_stub_impl = {
824         .ipv6_sock_mc_join = ipv6_sock_mc_join,
825         .ipv6_sock_mc_drop = ipv6_sock_mc_drop,
826         .ipv6_dst_lookup = ip6_dst_lookup,
827         .udpv6_encap_enable = udpv6_encap_enable,
828         .ndisc_send_na = ndisc_send_na,
829         .nd_tbl = &nd_tbl,
830 };
831 
832 static int __init inet6_init(void)
833 {
834         struct list_head *r;
835         int err = 0;
836 
837         sock_skb_cb_check_size(sizeof(struct inet6_skb_parm));
838 
839         /* Register the socket-side information for inet6_create.  */
840         for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
841                 INIT_LIST_HEAD(r);
842 
843         if (disable_ipv6_mod) {
844                 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
845                 goto out;
846         }
847 
848         err = proto_register(&tcpv6_prot, 1);
849         if (err)
850                 goto out;
851 
852         err = proto_register(&udpv6_prot, 1);
853         if (err)
854                 goto out_unregister_tcp_proto;
855 
856         err = proto_register(&udplitev6_prot, 1);
857         if (err)
858                 goto out_unregister_udp_proto;
859 
860         err = proto_register(&rawv6_prot, 1);
861         if (err)
862                 goto out_unregister_udplite_proto;
863 
864         err = proto_register(&pingv6_prot, 1);
865         if (err)
866                 goto out_unregister_ping_proto;
867 
868         /* We MUST register RAW sockets before we create the ICMP6,
869          * IGMP6, or NDISC control sockets.
870          */
871         err = rawv6_init();
872         if (err)
873                 goto out_unregister_raw_proto;
874 
875         /* Register the family here so that the init calls below will
876          * be able to create sockets. (?? is this dangerous ??)
877          */
878         err = sock_register(&inet6_family_ops);
879         if (err)
880                 goto out_sock_register_fail;
881 
882         /*
883          *      ipngwg API draft makes clear that the correct semantics
884          *      for TCP and UDP is to consider one TCP and UDP instance
885          *      in a host available by both INET and INET6 APIs and
886          *      able to communicate via both network protocols.
887          */
888 
889         err = register_pernet_subsys(&inet6_net_ops);
890         if (err)
891                 goto register_pernet_fail;
892         err = ip6_mr_init();
893         if (err)
894                 goto ipmr_fail;
895         err = icmpv6_init();
896         if (err)
897                 goto icmp_fail;
898         err = ndisc_init();
899         if (err)
900                 goto ndisc_fail;
901         err = igmp6_init();
902         if (err)
903                 goto igmp_fail;
904 
905         ipv6_stub = &ipv6_stub_impl;
906 
907         err = ipv6_netfilter_init();
908         if (err)
909                 goto netfilter_fail;
910         /* Create /proc/foo6 entries. */
911 #ifdef CONFIG_PROC_FS
912         err = -ENOMEM;
913         if (raw6_proc_init())
914                 goto proc_raw6_fail;
915         if (udplite6_proc_init())
916                 goto proc_udplite6_fail;
917         if (ipv6_misc_proc_init())
918                 goto proc_misc6_fail;
919         if (if6_proc_init())
920                 goto proc_if6_fail;
921 #endif
922         err = ip6_route_init();
923         if (err)
924                 goto ip6_route_fail;
925         err = ndisc_late_init();
926         if (err)
927                 goto ndisc_late_fail;
928         err = ip6_flowlabel_init();
929         if (err)
930                 goto ip6_flowlabel_fail;
931         err = addrconf_init();
932         if (err)
933                 goto addrconf_fail;
934 
935         /* Init v6 extension headers. */
936         err = ipv6_exthdrs_init();
937         if (err)
938                 goto ipv6_exthdrs_fail;
939 
940         err = ipv6_frag_init();
941         if (err)
942                 goto ipv6_frag_fail;
943 
944         /* Init v6 transport protocols. */
945         err = udpv6_init();
946         if (err)
947                 goto udpv6_fail;
948 
949         err = udplitev6_init();
950         if (err)
951                 goto udplitev6_fail;
952 
953         err = tcpv6_init();
954         if (err)
955                 goto tcpv6_fail;
956 
957         err = ipv6_packet_init();
958         if (err)
959                 goto ipv6_packet_fail;
960 
961         err = pingv6_init();
962         if (err)
963                 goto pingv6_fail;
964 
965 #ifdef CONFIG_SYSCTL
966         err = ipv6_sysctl_register();
967         if (err)
968                 goto sysctl_fail;
969 #endif
970 out:
971         return err;
972 
973 #ifdef CONFIG_SYSCTL
974 sysctl_fail:
975         pingv6_exit();
976 #endif
977 pingv6_fail:
978         ipv6_packet_cleanup();
979 ipv6_packet_fail:
980         tcpv6_exit();
981 tcpv6_fail:
982         udplitev6_exit();
983 udplitev6_fail:
984         udpv6_exit();
985 udpv6_fail:
986         ipv6_frag_exit();
987 ipv6_frag_fail:
988         ipv6_exthdrs_exit();
989 ipv6_exthdrs_fail:
990         addrconf_cleanup();
991 addrconf_fail:
992         ip6_flowlabel_cleanup();
993 ip6_flowlabel_fail:
994         ndisc_late_cleanup();
995 ndisc_late_fail:
996         ip6_route_cleanup();
997 ip6_route_fail:
998 #ifdef CONFIG_PROC_FS
999         if6_proc_exit();
1000 proc_if6_fail:
1001         ipv6_misc_proc_exit();
1002 proc_misc6_fail:
1003         udplite6_proc_exit();
1004 proc_udplite6_fail:
1005         raw6_proc_exit();
1006 proc_raw6_fail:
1007 #endif
1008         ipv6_netfilter_fini();
1009 netfilter_fail:
1010         igmp6_cleanup();
1011 igmp_fail:
1012         ndisc_cleanup();
1013 ndisc_fail:
1014         ip6_mr_cleanup();
1015 icmp_fail:
1016         unregister_pernet_subsys(&inet6_net_ops);
1017 ipmr_fail:
1018         icmpv6_cleanup();
1019 register_pernet_fail:
1020         sock_unregister(PF_INET6);
1021         rtnl_unregister_all(PF_INET6);
1022 out_sock_register_fail:
1023         rawv6_exit();
1024 out_unregister_ping_proto:
1025         proto_unregister(&pingv6_prot);
1026 out_unregister_raw_proto:
1027         proto_unregister(&rawv6_prot);
1028 out_unregister_udplite_proto:
1029         proto_unregister(&udplitev6_prot);
1030 out_unregister_udp_proto:
1031         proto_unregister(&udpv6_prot);
1032 out_unregister_tcp_proto:
1033         proto_unregister(&tcpv6_prot);
1034         goto out;
1035 }
1036 module_init(inet6_init);
1037 
1038 MODULE_ALIAS_NETPROTO(PF_INET6);
1039 

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