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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 == NULL);
168 
169         err = -ENOBUFS;
170         sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot);
171         if (sk == NULL)
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 (sk->sk_prot->get_port(sk, snum)) {
366                 inet_reset_saddr(sk);
367                 err = -EADDRINUSE;
368                 goto out;
369         }
370 
371         if (addr_type != IPV6_ADDR_ANY) {
372                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
373                 if (addr_type != IPV6_ADDR_MAPPED)
374                         sk->sk_ipv6only = 1;
375         }
376         if (snum)
377                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
378         inet->inet_sport = htons(inet->inet_num);
379         inet->inet_dport = 0;
380         inet->inet_daddr = 0;
381 out:
382         release_sock(sk);
383         return err;
384 out_unlock:
385         rcu_read_unlock();
386         goto out;
387 }
388 EXPORT_SYMBOL(inet6_bind);
389 
390 int inet6_release(struct socket *sock)
391 {
392         struct sock *sk = sock->sk;
393 
394         if (sk == NULL)
395                 return -EINVAL;
396 
397         /* Free mc lists */
398         ipv6_sock_mc_close(sk);
399 
400         /* Free ac lists */
401         ipv6_sock_ac_close(sk);
402 
403         return inet_release(sock);
404 }
405 EXPORT_SYMBOL(inet6_release);
406 
407 void inet6_destroy_sock(struct sock *sk)
408 {
409         struct ipv6_pinfo *np = inet6_sk(sk);
410         struct sk_buff *skb;
411         struct ipv6_txoptions *opt;
412 
413         /* Release rx options */
414 
415         skb = xchg(&np->pktoptions, NULL);
416         if (skb != NULL)
417                 kfree_skb(skb);
418 
419         skb = xchg(&np->rxpmtu, NULL);
420         if (skb != NULL)
421                 kfree_skb(skb);
422 
423         /* Free flowlabels */
424         fl6_free_socklist(sk);
425 
426         /* Free tx options */
427 
428         opt = xchg(&np->opt, NULL);
429         if (opt != NULL)
430                 sock_kfree_s(sk, opt, opt->tot_len);
431 }
432 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
433 
434 /*
435  *      This does both peername and sockname.
436  */
437 
438 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
439                  int *uaddr_len, int peer)
440 {
441         struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
442         struct sock *sk = sock->sk;
443         struct inet_sock *inet = inet_sk(sk);
444         struct ipv6_pinfo *np = inet6_sk(sk);
445 
446         sin->sin6_family = AF_INET6;
447         sin->sin6_flowinfo = 0;
448         sin->sin6_scope_id = 0;
449         if (peer) {
450                 if (!inet->inet_dport)
451                         return -ENOTCONN;
452                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
453                     peer == 1)
454                         return -ENOTCONN;
455                 sin->sin6_port = inet->inet_dport;
456                 sin->sin6_addr = sk->sk_v6_daddr;
457                 if (np->sndflow)
458                         sin->sin6_flowinfo = np->flow_label;
459         } else {
460                 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
461                         sin->sin6_addr = np->saddr;
462                 else
463                         sin->sin6_addr = sk->sk_v6_rcv_saddr;
464 
465                 sin->sin6_port = inet->inet_sport;
466         }
467         sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
468                                                  sk->sk_bound_dev_if);
469         *uaddr_len = sizeof(*sin);
470         return 0;
471 }
472 EXPORT_SYMBOL(inet6_getname);
473 
474 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
475 {
476         struct sock *sk = sock->sk;
477         struct net *net = sock_net(sk);
478 
479         switch (cmd) {
480         case SIOCGSTAMP:
481                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
482 
483         case SIOCGSTAMPNS:
484                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
485 
486         case SIOCADDRT:
487         case SIOCDELRT:
488 
489                 return ipv6_route_ioctl(net, cmd, (void __user *)arg);
490 
491         case SIOCSIFADDR:
492                 return addrconf_add_ifaddr(net, (void __user *) arg);
493         case SIOCDIFADDR:
494                 return addrconf_del_ifaddr(net, (void __user *) arg);
495         case SIOCSIFDSTADDR:
496                 return addrconf_set_dstaddr(net, (void __user *) arg);
497         default:
498                 if (!sk->sk_prot->ioctl)
499                         return -ENOIOCTLCMD;
500                 return sk->sk_prot->ioctl(sk, cmd, arg);
501         }
502         /*NOTREACHED*/
503         return 0;
504 }
505 EXPORT_SYMBOL(inet6_ioctl);
506 
507 const struct proto_ops inet6_stream_ops = {
508         .family            = PF_INET6,
509         .owner             = THIS_MODULE,
510         .release           = inet6_release,
511         .bind              = inet6_bind,
512         .connect           = inet_stream_connect,       /* ok           */
513         .socketpair        = sock_no_socketpair,        /* a do nothing */
514         .accept            = inet_accept,               /* ok           */
515         .getname           = inet6_getname,
516         .poll              = tcp_poll,                  /* ok           */
517         .ioctl             = inet6_ioctl,               /* must change  */
518         .listen            = inet_listen,               /* ok           */
519         .shutdown          = inet_shutdown,             /* ok           */
520         .setsockopt        = sock_common_setsockopt,    /* ok           */
521         .getsockopt        = sock_common_getsockopt,    /* ok           */
522         .sendmsg           = inet_sendmsg,              /* ok           */
523         .recvmsg           = inet_recvmsg,              /* ok           */
524         .mmap              = sock_no_mmap,
525         .sendpage          = inet_sendpage,
526         .splice_read       = tcp_splice_read,
527 #ifdef CONFIG_COMPAT
528         .compat_setsockopt = compat_sock_common_setsockopt,
529         .compat_getsockopt = compat_sock_common_getsockopt,
530 #endif
531 };
532 
533 const struct proto_ops inet6_dgram_ops = {
534         .family            = PF_INET6,
535         .owner             = THIS_MODULE,
536         .release           = inet6_release,
537         .bind              = inet6_bind,
538         .connect           = inet_dgram_connect,        /* ok           */
539         .socketpair        = sock_no_socketpair,        /* a do nothing */
540         .accept            = sock_no_accept,            /* a do nothing */
541         .getname           = inet6_getname,
542         .poll              = udp_poll,                  /* ok           */
543         .ioctl             = inet6_ioctl,               /* must change  */
544         .listen            = sock_no_listen,            /* ok           */
545         .shutdown          = inet_shutdown,             /* ok           */
546         .setsockopt        = sock_common_setsockopt,    /* ok           */
547         .getsockopt        = sock_common_getsockopt,    /* ok           */
548         .sendmsg           = inet_sendmsg,              /* ok           */
549         .recvmsg           = inet_recvmsg,              /* ok           */
550         .mmap              = sock_no_mmap,
551         .sendpage          = sock_no_sendpage,
552 #ifdef CONFIG_COMPAT
553         .compat_setsockopt = compat_sock_common_setsockopt,
554         .compat_getsockopt = compat_sock_common_getsockopt,
555 #endif
556 };
557 
558 static const struct net_proto_family inet6_family_ops = {
559         .family = PF_INET6,
560         .create = inet6_create,
561         .owner  = THIS_MODULE,
562 };
563 
564 int inet6_register_protosw(struct inet_protosw *p)
565 {
566         struct list_head *lh;
567         struct inet_protosw *answer;
568         struct list_head *last_perm;
569         int protocol = p->protocol;
570         int ret;
571 
572         spin_lock_bh(&inetsw6_lock);
573 
574         ret = -EINVAL;
575         if (p->type >= SOCK_MAX)
576                 goto out_illegal;
577 
578         /* If we are trying to override a permanent protocol, bail. */
579         answer = NULL;
580         ret = -EPERM;
581         last_perm = &inetsw6[p->type];
582         list_for_each(lh, &inetsw6[p->type]) {
583                 answer = list_entry(lh, struct inet_protosw, list);
584 
585                 /* Check only the non-wild match. */
586                 if (INET_PROTOSW_PERMANENT & answer->flags) {
587                         if (protocol == answer->protocol)
588                                 break;
589                         last_perm = lh;
590                 }
591 
592                 answer = NULL;
593         }
594         if (answer)
595                 goto out_permanent;
596 
597         /* Add the new entry after the last permanent entry if any, so that
598          * the new entry does not override a permanent entry when matched with
599          * a wild-card protocol. But it is allowed to override any existing
600          * non-permanent entry.  This means that when we remove this entry, the
601          * system automatically returns to the old behavior.
602          */
603         list_add_rcu(&p->list, last_perm);
604         ret = 0;
605 out:
606         spin_unlock_bh(&inetsw6_lock);
607         return ret;
608 
609 out_permanent:
610         pr_err("Attempt to override permanent protocol %d\n", protocol);
611         goto out;
612 
613 out_illegal:
614         pr_err("Ignoring attempt to register invalid socket type %d\n",
615                p->type);
616         goto out;
617 }
618 EXPORT_SYMBOL(inet6_register_protosw);
619 
620 void
621 inet6_unregister_protosw(struct inet_protosw *p)
622 {
623         if (INET_PROTOSW_PERMANENT & p->flags) {
624                 pr_err("Attempt to unregister permanent protocol %d\n",
625                        p->protocol);
626         } else {
627                 spin_lock_bh(&inetsw6_lock);
628                 list_del_rcu(&p->list);
629                 spin_unlock_bh(&inetsw6_lock);
630 
631                 synchronize_net();
632         }
633 }
634 EXPORT_SYMBOL(inet6_unregister_protosw);
635 
636 int inet6_sk_rebuild_header(struct sock *sk)
637 {
638         struct ipv6_pinfo *np = inet6_sk(sk);
639         struct dst_entry *dst;
640 
641         dst = __sk_dst_check(sk, np->dst_cookie);
642 
643         if (dst == NULL) {
644                 struct inet_sock *inet = inet_sk(sk);
645                 struct in6_addr *final_p, final;
646                 struct flowi6 fl6;
647 
648                 memset(&fl6, 0, sizeof(fl6));
649                 fl6.flowi6_proto = sk->sk_protocol;
650                 fl6.daddr = sk->sk_v6_daddr;
651                 fl6.saddr = np->saddr;
652                 fl6.flowlabel = np->flow_label;
653                 fl6.flowi6_oif = sk->sk_bound_dev_if;
654                 fl6.flowi6_mark = sk->sk_mark;
655                 fl6.fl6_dport = inet->inet_dport;
656                 fl6.fl6_sport = inet->inet_sport;
657                 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
658 
659                 final_p = fl6_update_dst(&fl6, np->opt, &final);
660 
661                 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
662                 if (IS_ERR(dst)) {
663                         sk->sk_route_caps = 0;
664                         sk->sk_err_soft = -PTR_ERR(dst);
665                         return PTR_ERR(dst);
666                 }
667 
668                 __ip6_dst_store(sk, dst, NULL, NULL);
669         }
670 
671         return 0;
672 }
673 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
674 
675 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
676                        const struct inet6_skb_parm *opt)
677 {
678         const struct ipv6_pinfo *np = inet6_sk(sk);
679 
680         if (np->rxopt.all) {
681                 if ((opt->hop && (np->rxopt.bits.hopopts ||
682                                   np->rxopt.bits.ohopopts)) ||
683                     (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) &&
684                      np->rxopt.bits.rxflow) ||
685                     (opt->srcrt && (np->rxopt.bits.srcrt ||
686                      np->rxopt.bits.osrcrt)) ||
687                     ((opt->dst1 || opt->dst0) &&
688                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
689                         return true;
690         }
691         return false;
692 }
693 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
694 
695 static struct packet_type ipv6_packet_type __read_mostly = {
696         .type = cpu_to_be16(ETH_P_IPV6),
697         .func = ipv6_rcv,
698 };
699 
700 static int __init ipv6_packet_init(void)
701 {
702         dev_add_pack(&ipv6_packet_type);
703         return 0;
704 }
705 
706 static void ipv6_packet_cleanup(void)
707 {
708         dev_remove_pack(&ipv6_packet_type);
709 }
710 
711 static int __net_init ipv6_init_mibs(struct net *net)
712 {
713         int i;
714 
715         net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib);
716         if (!net->mib.udp_stats_in6)
717                 return -ENOMEM;
718         net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib);
719         if (!net->mib.udplite_stats_in6)
720                 goto err_udplite_mib;
721         net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib);
722         if (!net->mib.ipv6_statistics)
723                 goto err_ip_mib;
724 
725         for_each_possible_cpu(i) {
726                 struct ipstats_mib *af_inet6_stats;
727                 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i);
728                 u64_stats_init(&af_inet6_stats->syncp);
729         }
730 
731 
732         net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib);
733         if (!net->mib.icmpv6_statistics)
734                 goto err_icmp_mib;
735         net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
736                                                 GFP_KERNEL);
737         if (!net->mib.icmpv6msg_statistics)
738                 goto err_icmpmsg_mib;
739         return 0;
740 
741 err_icmpmsg_mib:
742         free_percpu(net->mib.icmpv6_statistics);
743 err_icmp_mib:
744         free_percpu(net->mib.ipv6_statistics);
745 err_ip_mib:
746         free_percpu(net->mib.udplite_stats_in6);
747 err_udplite_mib:
748         free_percpu(net->mib.udp_stats_in6);
749         return -ENOMEM;
750 }
751 
752 static void ipv6_cleanup_mibs(struct net *net)
753 {
754         free_percpu(net->mib.udp_stats_in6);
755         free_percpu(net->mib.udplite_stats_in6);
756         free_percpu(net->mib.ipv6_statistics);
757         free_percpu(net->mib.icmpv6_statistics);
758         kfree(net->mib.icmpv6msg_statistics);
759 }
760 
761 static int __net_init inet6_net_init(struct net *net)
762 {
763         int err = 0;
764 
765         net->ipv6.sysctl.bindv6only = 0;
766         net->ipv6.sysctl.icmpv6_time = 1*HZ;
767         net->ipv6.sysctl.flowlabel_consistency = 1;
768         net->ipv6.sysctl.auto_flowlabels = 0;
769         atomic_set(&net->ipv6.fib6_sernum, 1);
770 
771         err = ipv6_init_mibs(net);
772         if (err)
773                 return err;
774 #ifdef CONFIG_PROC_FS
775         err = udp6_proc_init(net);
776         if (err)
777                 goto out;
778         err = tcp6_proc_init(net);
779         if (err)
780                 goto proc_tcp6_fail;
781         err = ac6_proc_init(net);
782         if (err)
783                 goto proc_ac6_fail;
784 #endif
785         return err;
786 
787 #ifdef CONFIG_PROC_FS
788 proc_ac6_fail:
789         tcp6_proc_exit(net);
790 proc_tcp6_fail:
791         udp6_proc_exit(net);
792 out:
793         ipv6_cleanup_mibs(net);
794         return err;
795 #endif
796 }
797 
798 static void __net_exit inet6_net_exit(struct net *net)
799 {
800 #ifdef CONFIG_PROC_FS
801         udp6_proc_exit(net);
802         tcp6_proc_exit(net);
803         ac6_proc_exit(net);
804 #endif
805         ipv6_cleanup_mibs(net);
806 }
807 
808 static struct pernet_operations inet6_net_ops = {
809         .init = inet6_net_init,
810         .exit = inet6_net_exit,
811 };
812 
813 static const struct ipv6_stub ipv6_stub_impl = {
814         .ipv6_sock_mc_join = ipv6_sock_mc_join,
815         .ipv6_sock_mc_drop = ipv6_sock_mc_drop,
816         .ipv6_dst_lookup = ip6_dst_lookup,
817         .udpv6_encap_enable = udpv6_encap_enable,
818         .ndisc_send_na = ndisc_send_na,
819         .nd_tbl = &nd_tbl,
820 };
821 
822 static int __init inet6_init(void)
823 {
824         struct list_head *r;
825         int err = 0;
826 
827         BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > FIELD_SIZEOF(struct sk_buff, cb));
828 
829         /* Register the socket-side information for inet6_create.  */
830         for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
831                 INIT_LIST_HEAD(r);
832 
833         if (disable_ipv6_mod) {
834                 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
835                 goto out;
836         }
837 
838         err = proto_register(&tcpv6_prot, 1);
839         if (err)
840                 goto out;
841 
842         err = proto_register(&udpv6_prot, 1);
843         if (err)
844                 goto out_unregister_tcp_proto;
845 
846         err = proto_register(&udplitev6_prot, 1);
847         if (err)
848                 goto out_unregister_udp_proto;
849 
850         err = proto_register(&rawv6_prot, 1);
851         if (err)
852                 goto out_unregister_udplite_proto;
853 
854         err = proto_register(&pingv6_prot, 1);
855         if (err)
856                 goto out_unregister_ping_proto;
857 
858         /* We MUST register RAW sockets before we create the ICMP6,
859          * IGMP6, or NDISC control sockets.
860          */
861         err = rawv6_init();
862         if (err)
863                 goto out_unregister_raw_proto;
864 
865         /* Register the family here so that the init calls below will
866          * be able to create sockets. (?? is this dangerous ??)
867          */
868         err = sock_register(&inet6_family_ops);
869         if (err)
870                 goto out_sock_register_fail;
871 
872         /*
873          *      ipngwg API draft makes clear that the correct semantics
874          *      for TCP and UDP is to consider one TCP and UDP instance
875          *      in a host available by both INET and INET6 APIs and
876          *      able to communicate via both network protocols.
877          */
878 
879         err = register_pernet_subsys(&inet6_net_ops);
880         if (err)
881                 goto register_pernet_fail;
882         err = icmpv6_init();
883         if (err)
884                 goto icmp_fail;
885         err = ip6_mr_init();
886         if (err)
887                 goto ipmr_fail;
888         err = ndisc_init();
889         if (err)
890                 goto ndisc_fail;
891         err = igmp6_init();
892         if (err)
893                 goto igmp_fail;
894 
895         ipv6_stub = &ipv6_stub_impl;
896 
897         err = ipv6_netfilter_init();
898         if (err)
899                 goto netfilter_fail;
900         /* Create /proc/foo6 entries. */
901 #ifdef CONFIG_PROC_FS
902         err = -ENOMEM;
903         if (raw6_proc_init())
904                 goto proc_raw6_fail;
905         if (udplite6_proc_init())
906                 goto proc_udplite6_fail;
907         if (ipv6_misc_proc_init())
908                 goto proc_misc6_fail;
909         if (if6_proc_init())
910                 goto proc_if6_fail;
911 #endif
912         err = ip6_route_init();
913         if (err)
914                 goto ip6_route_fail;
915         err = ndisc_late_init();
916         if (err)
917                 goto ndisc_late_fail;
918         err = ip6_flowlabel_init();
919         if (err)
920                 goto ip6_flowlabel_fail;
921         err = addrconf_init();
922         if (err)
923                 goto addrconf_fail;
924 
925         /* Init v6 extension headers. */
926         err = ipv6_exthdrs_init();
927         if (err)
928                 goto ipv6_exthdrs_fail;
929 
930         err = ipv6_frag_init();
931         if (err)
932                 goto ipv6_frag_fail;
933 
934         /* Init v6 transport protocols. */
935         err = udpv6_init();
936         if (err)
937                 goto udpv6_fail;
938 
939         err = udplitev6_init();
940         if (err)
941                 goto udplitev6_fail;
942 
943         err = tcpv6_init();
944         if (err)
945                 goto tcpv6_fail;
946 
947         err = ipv6_packet_init();
948         if (err)
949                 goto ipv6_packet_fail;
950 
951         err = pingv6_init();
952         if (err)
953                 goto pingv6_fail;
954 
955 #ifdef CONFIG_SYSCTL
956         err = ipv6_sysctl_register();
957         if (err)
958                 goto sysctl_fail;
959 #endif
960 out:
961         return err;
962 
963 #ifdef CONFIG_SYSCTL
964 sysctl_fail:
965         pingv6_exit();
966 #endif
967 pingv6_fail:
968         ipv6_packet_cleanup();
969 ipv6_packet_fail:
970         tcpv6_exit();
971 tcpv6_fail:
972         udplitev6_exit();
973 udplitev6_fail:
974         udpv6_exit();
975 udpv6_fail:
976         ipv6_frag_exit();
977 ipv6_frag_fail:
978         ipv6_exthdrs_exit();
979 ipv6_exthdrs_fail:
980         addrconf_cleanup();
981 addrconf_fail:
982         ip6_flowlabel_cleanup();
983 ip6_flowlabel_fail:
984         ndisc_late_cleanup();
985 ndisc_late_fail:
986         ip6_route_cleanup();
987 ip6_route_fail:
988 #ifdef CONFIG_PROC_FS
989         if6_proc_exit();
990 proc_if6_fail:
991         ipv6_misc_proc_exit();
992 proc_misc6_fail:
993         udplite6_proc_exit();
994 proc_udplite6_fail:
995         raw6_proc_exit();
996 proc_raw6_fail:
997 #endif
998         ipv6_netfilter_fini();
999 netfilter_fail:
1000         igmp6_cleanup();
1001 igmp_fail:
1002         ndisc_cleanup();
1003 ndisc_fail:
1004         ip6_mr_cleanup();
1005 ipmr_fail:
1006         icmpv6_cleanup();
1007 icmp_fail:
1008         unregister_pernet_subsys(&inet6_net_ops);
1009 register_pernet_fail:
1010         sock_unregister(PF_INET6);
1011         rtnl_unregister_all(PF_INET6);
1012 out_sock_register_fail:
1013         rawv6_exit();
1014 out_unregister_ping_proto:
1015         proto_unregister(&pingv6_prot);
1016 out_unregister_raw_proto:
1017         proto_unregister(&rawv6_prot);
1018 out_unregister_udplite_proto:
1019         proto_unregister(&udplitev6_prot);
1020 out_unregister_udp_proto:
1021         proto_unregister(&udpv6_prot);
1022 out_unregister_tcp_proto:
1023         proto_unregister(&tcpv6_prot);
1024         goto out;
1025 }
1026 module_init(inet6_init);
1027 
1028 MODULE_ALIAS_NETPROTO(PF_INET6);
1029 

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