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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 #include "ip6_offload.h"
 68 
 69 MODULE_AUTHOR("Cast of dozens");
 70 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
 71 MODULE_LICENSE("GPL");
 72 
 73 /* The inetsw6 table contains everything that inet6_create needs to
 74  * build a new socket.
 75  */
 76 static struct list_head inetsw6[SOCK_MAX];
 77 static DEFINE_SPINLOCK(inetsw6_lock);
 78 
 79 struct ipv6_params ipv6_defaults = {
 80         .disable_ipv6 = 0,
 81         .autoconf = 1,
 82 };
 83 
 84 static int disable_ipv6_mod;
 85 
 86 module_param_named(disable, disable_ipv6_mod, int, 0444);
 87 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
 88 
 89 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
 90 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
 91 
 92 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
 93 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
 94 
 95 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
 96 {
 97         const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
 98 
 99         return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
100 }
101 
102 static int inet6_create(struct net *net, struct socket *sock, int protocol,
103                         int kern)
104 {
105         struct inet_sock *inet;
106         struct ipv6_pinfo *np;
107         struct sock *sk;
108         struct inet_protosw *answer;
109         struct proto *answer_prot;
110         unsigned char answer_flags;
111         int try_loading_module = 0;
112         int err;
113 
114         if (protocol < 0 || protocol >= IPPROTO_MAX)
115                 return -EINVAL;
116 
117         /* Look for the requested type/protocol pair. */
118 lookup_protocol:
119         err = -ESOCKTNOSUPPORT;
120         rcu_read_lock();
121         list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
122 
123                 err = 0;
124                 /* Check the non-wild match. */
125                 if (protocol == answer->protocol) {
126                         if (protocol != IPPROTO_IP)
127                                 break;
128                 } else {
129                         /* Check for the two wild cases. */
130                         if (IPPROTO_IP == protocol) {
131                                 protocol = answer->protocol;
132                                 break;
133                         }
134                         if (IPPROTO_IP == answer->protocol)
135                                 break;
136                 }
137                 err = -EPROTONOSUPPORT;
138         }
139 
140         if (err) {
141                 if (try_loading_module < 2) {
142                         rcu_read_unlock();
143                         /*
144                          * Be more specific, e.g. net-pf-10-proto-132-type-1
145                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
146                          */
147                         if (++try_loading_module == 1)
148                                 request_module("net-pf-%d-proto-%d-type-%d",
149                                                 PF_INET6, protocol, sock->type);
150                         /*
151                          * Fall back to generic, e.g. net-pf-10-proto-132
152                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
153                          */
154                         else
155                                 request_module("net-pf-%d-proto-%d",
156                                                 PF_INET6, protocol);
157                         goto lookup_protocol;
158                 } else
159                         goto out_rcu_unlock;
160         }
161 
162         err = -EPERM;
163         if (sock->type == SOCK_RAW && !kern &&
164             !ns_capable(net->user_ns, CAP_NET_RAW))
165                 goto out_rcu_unlock;
166 
167         sock->ops = answer->ops;
168         answer_prot = answer->prot;
169         answer_flags = answer->flags;
170         rcu_read_unlock();
171 
172         WARN_ON(!answer_prot->slab);
173 
174         err = -ENOBUFS;
175         sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern);
176         if (!sk)
177                 goto out;
178 
179         sock_init_data(sock, sk);
180 
181         err = 0;
182         if (INET_PROTOSW_REUSE & answer_flags)
183                 sk->sk_reuse = SK_CAN_REUSE;
184 
185         inet = inet_sk(sk);
186         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
187 
188         if (SOCK_RAW == sock->type) {
189                 inet->inet_num = protocol;
190                 if (IPPROTO_RAW == protocol)
191                         inet->hdrincl = 1;
192         }
193 
194         sk->sk_destruct         = inet_sock_destruct;
195         sk->sk_family           = PF_INET6;
196         sk->sk_protocol         = protocol;
197 
198         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
199 
200         inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
201         np->hop_limit   = -1;
202         np->mcast_hops  = IPV6_DEFAULT_MCASTHOPS;
203         np->mc_loop     = 1;
204         np->pmtudisc    = IPV6_PMTUDISC_WANT;
205         np->autoflowlabel = ip6_default_np_autolabel(sock_net(sk));
206         sk->sk_ipv6only = net->ipv6.sysctl.bindv6only;
207 
208         /* Init the ipv4 part of the socket since we can have sockets
209          * using v6 API for ipv4.
210          */
211         inet->uc_ttl    = -1;
212 
213         inet->mc_loop   = 1;
214         inet->mc_ttl    = 1;
215         inet->mc_index  = 0;
216         inet->mc_list   = NULL;
217         inet->rcv_tos   = 0;
218 
219         if (net->ipv4.sysctl_ip_no_pmtu_disc)
220                 inet->pmtudisc = IP_PMTUDISC_DONT;
221         else
222                 inet->pmtudisc = IP_PMTUDISC_WANT;
223         /*
224          * Increment only the relevant sk_prot->socks debug field, this changes
225          * the previous behaviour of incrementing both the equivalent to
226          * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
227          *
228          * This allows better debug granularity as we'll know exactly how many
229          * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
230          * transport protocol socks. -acme
231          */
232         sk_refcnt_debug_inc(sk);
233 
234         if (inet->inet_num) {
235                 /* It assumes that any protocol which allows
236                  * the user to assign a number at socket
237                  * creation time automatically shares.
238                  */
239                 inet->inet_sport = htons(inet->inet_num);
240                 err = sk->sk_prot->hash(sk);
241                 if (err) {
242                         sk_common_release(sk);
243                         goto out;
244                 }
245         }
246         if (sk->sk_prot->init) {
247                 err = sk->sk_prot->init(sk);
248                 if (err) {
249                         sk_common_release(sk);
250                         goto out;
251                 }
252         }
253 out:
254         return err;
255 out_rcu_unlock:
256         rcu_read_unlock();
257         goto out;
258 }
259 
260 
261 /* bind for INET6 API */
262 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
263 {
264         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
265         struct sock *sk = sock->sk;
266         struct inet_sock *inet = inet_sk(sk);
267         struct ipv6_pinfo *np = inet6_sk(sk);
268         struct net *net = sock_net(sk);
269         __be32 v4addr = 0;
270         unsigned short snum;
271         int addr_type = 0;
272         int err = 0;
273 
274         /* If the socket has its own bind function then use it. */
275         if (sk->sk_prot->bind)
276                 return sk->sk_prot->bind(sk, uaddr, addr_len);
277 
278         if (addr_len < SIN6_LEN_RFC2133)
279                 return -EINVAL;
280 
281         if (addr->sin6_family != AF_INET6)
282                 return -EAFNOSUPPORT;
283 
284         addr_type = ipv6_addr_type(&addr->sin6_addr);
285         if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
286                 return -EINVAL;
287 
288         snum = ntohs(addr->sin6_port);
289         if (snum && snum < PROT_SOCK && !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
290                 return -EACCES;
291 
292         lock_sock(sk);
293 
294         /* Check these errors (active socket, double bind). */
295         if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
296                 err = -EINVAL;
297                 goto out;
298         }
299 
300         /* Check if the address belongs to the host. */
301         if (addr_type == IPV6_ADDR_MAPPED) {
302                 int chk_addr_ret;
303 
304                 /* Binding to v4-mapped address on a v6-only socket
305                  * makes no sense
306                  */
307                 if (sk->sk_ipv6only) {
308                         err = -EINVAL;
309                         goto out;
310                 }
311 
312                 /* Reproduce AF_INET checks to make the bindings consistent */
313                 v4addr = addr->sin6_addr.s6_addr32[3];
314                 chk_addr_ret = inet_addr_type(net, v4addr);
315                 if (!net->ipv4.sysctl_ip_nonlocal_bind &&
316                     !(inet->freebind || inet->transparent) &&
317                     v4addr != htonl(INADDR_ANY) &&
318                     chk_addr_ret != RTN_LOCAL &&
319                     chk_addr_ret != RTN_MULTICAST &&
320                     chk_addr_ret != RTN_BROADCAST) {
321                         err = -EADDRNOTAVAIL;
322                         goto out;
323                 }
324         } else {
325                 if (addr_type != IPV6_ADDR_ANY) {
326                         struct net_device *dev = NULL;
327 
328                         rcu_read_lock();
329                         if (__ipv6_addr_needs_scope_id(addr_type)) {
330                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
331                                     addr->sin6_scope_id) {
332                                         /* Override any existing binding, if another one
333                                          * is supplied by user.
334                                          */
335                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
336                                 }
337 
338                                 /* Binding to link-local address requires an interface */
339                                 if (!sk->sk_bound_dev_if) {
340                                         err = -EINVAL;
341                                         goto out_unlock;
342                                 }
343                                 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
344                                 if (!dev) {
345                                         err = -ENODEV;
346                                         goto out_unlock;
347                                 }
348                         }
349 
350                         /* ipv4 addr of the socket is invalid.  Only the
351                          * unspecified and mapped address have a v4 equivalent.
352                          */
353                         v4addr = LOOPBACK4_IPV6;
354                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
355                                 if (!net->ipv6.sysctl.ip_nonlocal_bind &&
356                                     !(inet->freebind || inet->transparent) &&
357                                     !ipv6_chk_addr(net, &addr->sin6_addr,
358                                                    dev, 0)) {
359                                         err = -EADDRNOTAVAIL;
360                                         goto out_unlock;
361                                 }
362                         }
363                         rcu_read_unlock();
364                 }
365         }
366 
367         inet->inet_rcv_saddr = v4addr;
368         inet->inet_saddr = v4addr;
369 
370         sk->sk_v6_rcv_saddr = addr->sin6_addr;
371 
372         if (!(addr_type & IPV6_ADDR_MULTICAST))
373                 np->saddr = addr->sin6_addr;
374 
375         /* Make sure we are allowed to bind here. */
376         if ((snum || !inet->bind_address_no_port) &&
377             sk->sk_prot->get_port(sk, snum)) {
378                 inet_reset_saddr(sk);
379                 err = -EADDRINUSE;
380                 goto out;
381         }
382 
383         if (addr_type != IPV6_ADDR_ANY) {
384                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
385                 if (addr_type != IPV6_ADDR_MAPPED)
386                         sk->sk_ipv6only = 1;
387         }
388         if (snum)
389                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
390         inet->inet_sport = htons(inet->inet_num);
391         inet->inet_dport = 0;
392         inet->inet_daddr = 0;
393 out:
394         release_sock(sk);
395         return err;
396 out_unlock:
397         rcu_read_unlock();
398         goto out;
399 }
400 EXPORT_SYMBOL(inet6_bind);
401 
402 int inet6_release(struct socket *sock)
403 {
404         struct sock *sk = sock->sk;
405 
406         if (!sk)
407                 return -EINVAL;
408 
409         /* Free mc lists */
410         ipv6_sock_mc_close(sk);
411 
412         /* Free ac lists */
413         ipv6_sock_ac_close(sk);
414 
415         return inet_release(sock);
416 }
417 EXPORT_SYMBOL(inet6_release);
418 
419 void inet6_destroy_sock(struct sock *sk)
420 {
421         struct ipv6_pinfo *np = inet6_sk(sk);
422         struct sk_buff *skb;
423         struct ipv6_txoptions *opt;
424 
425         /* Release rx options */
426 
427         skb = xchg(&np->pktoptions, NULL);
428         if (skb)
429                 kfree_skb(skb);
430 
431         skb = xchg(&np->rxpmtu, NULL);
432         if (skb)
433                 kfree_skb(skb);
434 
435         /* Free flowlabels */
436         fl6_free_socklist(sk);
437 
438         /* Free tx options */
439 
440         opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL);
441         if (opt) {
442                 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
443                 txopt_put(opt);
444         }
445 }
446 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
447 
448 /*
449  *      This does both peername and sockname.
450  */
451 
452 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
453                  int *uaddr_len, int peer)
454 {
455         struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
456         struct sock *sk = sock->sk;
457         struct inet_sock *inet = inet_sk(sk);
458         struct ipv6_pinfo *np = inet6_sk(sk);
459 
460         sin->sin6_family = AF_INET6;
461         sin->sin6_flowinfo = 0;
462         sin->sin6_scope_id = 0;
463         if (peer) {
464                 if (!inet->inet_dport)
465                         return -ENOTCONN;
466                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
467                     peer == 1)
468                         return -ENOTCONN;
469                 sin->sin6_port = inet->inet_dport;
470                 sin->sin6_addr = sk->sk_v6_daddr;
471                 if (np->sndflow)
472                         sin->sin6_flowinfo = np->flow_label;
473         } else {
474                 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
475                         sin->sin6_addr = np->saddr;
476                 else
477                         sin->sin6_addr = sk->sk_v6_rcv_saddr;
478 
479                 sin->sin6_port = inet->inet_sport;
480         }
481         sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
482                                                  sk->sk_bound_dev_if);
483         *uaddr_len = sizeof(*sin);
484         return 0;
485 }
486 EXPORT_SYMBOL(inet6_getname);
487 
488 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
489 {
490         struct sock *sk = sock->sk;
491         struct net *net = sock_net(sk);
492 
493         switch (cmd) {
494         case SIOCGSTAMP:
495                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
496 
497         case SIOCGSTAMPNS:
498                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
499 
500         case SIOCADDRT:
501         case SIOCDELRT:
502 
503                 return ipv6_route_ioctl(net, cmd, (void __user *)arg);
504 
505         case SIOCSIFADDR:
506                 return addrconf_add_ifaddr(net, (void __user *) arg);
507         case SIOCDIFADDR:
508                 return addrconf_del_ifaddr(net, (void __user *) arg);
509         case SIOCSIFDSTADDR:
510                 return addrconf_set_dstaddr(net, (void __user *) arg);
511         default:
512                 if (!sk->sk_prot->ioctl)
513                         return -ENOIOCTLCMD;
514                 return sk->sk_prot->ioctl(sk, cmd, arg);
515         }
516         /*NOTREACHED*/
517         return 0;
518 }
519 EXPORT_SYMBOL(inet6_ioctl);
520 
521 const struct proto_ops inet6_stream_ops = {
522         .family            = PF_INET6,
523         .owner             = THIS_MODULE,
524         .release           = inet6_release,
525         .bind              = inet6_bind,
526         .connect           = inet_stream_connect,       /* ok           */
527         .socketpair        = sock_no_socketpair,        /* a do nothing */
528         .accept            = inet_accept,               /* ok           */
529         .getname           = inet6_getname,
530         .poll              = tcp_poll,                  /* ok           */
531         .ioctl             = inet6_ioctl,               /* must change  */
532         .listen            = inet_listen,               /* ok           */
533         .shutdown          = inet_shutdown,             /* ok           */
534         .setsockopt        = sock_common_setsockopt,    /* ok           */
535         .getsockopt        = sock_common_getsockopt,    /* ok           */
536         .sendmsg           = inet_sendmsg,              /* ok           */
537         .recvmsg           = inet_recvmsg,              /* ok           */
538         .mmap              = sock_no_mmap,
539         .sendpage          = inet_sendpage,
540         .splice_read       = tcp_splice_read,
541 #ifdef CONFIG_COMPAT
542         .compat_setsockopt = compat_sock_common_setsockopt,
543         .compat_getsockopt = compat_sock_common_getsockopt,
544 #endif
545 };
546 
547 const struct proto_ops inet6_dgram_ops = {
548         .family            = PF_INET6,
549         .owner             = THIS_MODULE,
550         .release           = inet6_release,
551         .bind              = inet6_bind,
552         .connect           = inet_dgram_connect,        /* ok           */
553         .socketpair        = sock_no_socketpair,        /* a do nothing */
554         .accept            = sock_no_accept,            /* a do nothing */
555         .getname           = inet6_getname,
556         .poll              = udp_poll,                  /* ok           */
557         .ioctl             = inet6_ioctl,               /* must change  */
558         .listen            = sock_no_listen,            /* ok           */
559         .shutdown          = inet_shutdown,             /* ok           */
560         .setsockopt        = sock_common_setsockopt,    /* ok           */
561         .getsockopt        = sock_common_getsockopt,    /* ok           */
562         .sendmsg           = inet_sendmsg,              /* ok           */
563         .recvmsg           = inet_recvmsg,              /* ok           */
564         .mmap              = sock_no_mmap,
565         .sendpage          = sock_no_sendpage,
566         .set_peek_off      = sk_set_peek_off,
567 #ifdef CONFIG_COMPAT
568         .compat_setsockopt = compat_sock_common_setsockopt,
569         .compat_getsockopt = compat_sock_common_getsockopt,
570 #endif
571 };
572 
573 static const struct net_proto_family inet6_family_ops = {
574         .family = PF_INET6,
575         .create = inet6_create,
576         .owner  = THIS_MODULE,
577 };
578 
579 int inet6_register_protosw(struct inet_protosw *p)
580 {
581         struct list_head *lh;
582         struct inet_protosw *answer;
583         struct list_head *last_perm;
584         int protocol = p->protocol;
585         int ret;
586 
587         spin_lock_bh(&inetsw6_lock);
588 
589         ret = -EINVAL;
590         if (p->type >= SOCK_MAX)
591                 goto out_illegal;
592 
593         /* If we are trying to override a permanent protocol, bail. */
594         answer = NULL;
595         ret = -EPERM;
596         last_perm = &inetsw6[p->type];
597         list_for_each(lh, &inetsw6[p->type]) {
598                 answer = list_entry(lh, struct inet_protosw, list);
599 
600                 /* Check only the non-wild match. */
601                 if (INET_PROTOSW_PERMANENT & answer->flags) {
602                         if (protocol == answer->protocol)
603                                 break;
604                         last_perm = lh;
605                 }
606 
607                 answer = NULL;
608         }
609         if (answer)
610                 goto out_permanent;
611 
612         /* Add the new entry after the last permanent entry if any, so that
613          * the new entry does not override a permanent entry when matched with
614          * a wild-card protocol. But it is allowed to override any existing
615          * non-permanent entry.  This means that when we remove this entry, the
616          * system automatically returns to the old behavior.
617          */
618         list_add_rcu(&p->list, last_perm);
619         ret = 0;
620 out:
621         spin_unlock_bh(&inetsw6_lock);
622         return ret;
623 
624 out_permanent:
625         pr_err("Attempt to override permanent protocol %d\n", protocol);
626         goto out;
627 
628 out_illegal:
629         pr_err("Ignoring attempt to register invalid socket type %d\n",
630                p->type);
631         goto out;
632 }
633 EXPORT_SYMBOL(inet6_register_protosw);
634 
635 void
636 inet6_unregister_protosw(struct inet_protosw *p)
637 {
638         if (INET_PROTOSW_PERMANENT & p->flags) {
639                 pr_err("Attempt to unregister permanent protocol %d\n",
640                        p->protocol);
641         } else {
642                 spin_lock_bh(&inetsw6_lock);
643                 list_del_rcu(&p->list);
644                 spin_unlock_bh(&inetsw6_lock);
645 
646                 synchronize_net();
647         }
648 }
649 EXPORT_SYMBOL(inet6_unregister_protosw);
650 
651 int inet6_sk_rebuild_header(struct sock *sk)
652 {
653         struct ipv6_pinfo *np = inet6_sk(sk);
654         struct dst_entry *dst;
655 
656         dst = __sk_dst_check(sk, np->dst_cookie);
657 
658         if (!dst) {
659                 struct inet_sock *inet = inet_sk(sk);
660                 struct in6_addr *final_p, final;
661                 struct flowi6 fl6;
662 
663                 memset(&fl6, 0, sizeof(fl6));
664                 fl6.flowi6_proto = sk->sk_protocol;
665                 fl6.daddr = sk->sk_v6_daddr;
666                 fl6.saddr = np->saddr;
667                 fl6.flowlabel = np->flow_label;
668                 fl6.flowi6_oif = sk->sk_bound_dev_if;
669                 fl6.flowi6_mark = sk->sk_mark;
670                 fl6.fl6_dport = inet->inet_dport;
671                 fl6.fl6_sport = inet->inet_sport;
672                 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
673 
674                 rcu_read_lock();
675                 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt),
676                                          &final);
677                 rcu_read_unlock();
678 
679                 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
680                 if (IS_ERR(dst)) {
681                         sk->sk_route_caps = 0;
682                         sk->sk_err_soft = -PTR_ERR(dst);
683                         return PTR_ERR(dst);
684                 }
685 
686                 ip6_dst_store(sk, dst, NULL, NULL);
687         }
688 
689         return 0;
690 }
691 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
692 
693 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
694                        const struct inet6_skb_parm *opt)
695 {
696         const struct ipv6_pinfo *np = inet6_sk(sk);
697 
698         if (np->rxopt.all) {
699                 if (((opt->flags & IP6SKB_HOPBYHOP) &&
700                      (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) ||
701                     (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) &&
702                      np->rxopt.bits.rxflow) ||
703                     (opt->srcrt && (np->rxopt.bits.srcrt ||
704                      np->rxopt.bits.osrcrt)) ||
705                     ((opt->dst1 || opt->dst0) &&
706                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
707                         return true;
708         }
709         return false;
710 }
711 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
712 
713 static struct packet_type ipv6_packet_type __read_mostly = {
714         .type = cpu_to_be16(ETH_P_IPV6),
715         .func = ipv6_rcv,
716 };
717 
718 static int __init ipv6_packet_init(void)
719 {
720         dev_add_pack(&ipv6_packet_type);
721         return 0;
722 }
723 
724 static void ipv6_packet_cleanup(void)
725 {
726         dev_remove_pack(&ipv6_packet_type);
727 }
728 
729 static int __net_init ipv6_init_mibs(struct net *net)
730 {
731         int i;
732 
733         net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib);
734         if (!net->mib.udp_stats_in6)
735                 return -ENOMEM;
736         net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib);
737         if (!net->mib.udplite_stats_in6)
738                 goto err_udplite_mib;
739         net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib);
740         if (!net->mib.ipv6_statistics)
741                 goto err_ip_mib;
742 
743         for_each_possible_cpu(i) {
744                 struct ipstats_mib *af_inet6_stats;
745                 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i);
746                 u64_stats_init(&af_inet6_stats->syncp);
747         }
748 
749 
750         net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib);
751         if (!net->mib.icmpv6_statistics)
752                 goto err_icmp_mib;
753         net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
754                                                 GFP_KERNEL);
755         if (!net->mib.icmpv6msg_statistics)
756                 goto err_icmpmsg_mib;
757         return 0;
758 
759 err_icmpmsg_mib:
760         free_percpu(net->mib.icmpv6_statistics);
761 err_icmp_mib:
762         free_percpu(net->mib.ipv6_statistics);
763 err_ip_mib:
764         free_percpu(net->mib.udplite_stats_in6);
765 err_udplite_mib:
766         free_percpu(net->mib.udp_stats_in6);
767         return -ENOMEM;
768 }
769 
770 static void ipv6_cleanup_mibs(struct net *net)
771 {
772         free_percpu(net->mib.udp_stats_in6);
773         free_percpu(net->mib.udplite_stats_in6);
774         free_percpu(net->mib.ipv6_statistics);
775         free_percpu(net->mib.icmpv6_statistics);
776         kfree(net->mib.icmpv6msg_statistics);
777 }
778 
779 static int __net_init inet6_net_init(struct net *net)
780 {
781         int err = 0;
782 
783         net->ipv6.sysctl.bindv6only = 0;
784         net->ipv6.sysctl.icmpv6_time = 1*HZ;
785         net->ipv6.sysctl.flowlabel_consistency = 1;
786         net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS;
787         net->ipv6.sysctl.idgen_retries = 3;
788         net->ipv6.sysctl.idgen_delay = 1 * HZ;
789         net->ipv6.sysctl.flowlabel_state_ranges = 0;
790         atomic_set(&net->ipv6.fib6_sernum, 1);
791 
792         err = ipv6_init_mibs(net);
793         if (err)
794                 return err;
795 #ifdef CONFIG_PROC_FS
796         err = udp6_proc_init(net);
797         if (err)
798                 goto out;
799         err = tcp6_proc_init(net);
800         if (err)
801                 goto proc_tcp6_fail;
802         err = ac6_proc_init(net);
803         if (err)
804                 goto proc_ac6_fail;
805 #endif
806         return err;
807 
808 #ifdef CONFIG_PROC_FS
809 proc_ac6_fail:
810         tcp6_proc_exit(net);
811 proc_tcp6_fail:
812         udp6_proc_exit(net);
813 out:
814         ipv6_cleanup_mibs(net);
815         return err;
816 #endif
817 }
818 
819 static void __net_exit inet6_net_exit(struct net *net)
820 {
821 #ifdef CONFIG_PROC_FS
822         udp6_proc_exit(net);
823         tcp6_proc_exit(net);
824         ac6_proc_exit(net);
825 #endif
826         ipv6_cleanup_mibs(net);
827 }
828 
829 static struct pernet_operations inet6_net_ops = {
830         .init = inet6_net_init,
831         .exit = inet6_net_exit,
832 };
833 
834 static const struct ipv6_stub ipv6_stub_impl = {
835         .ipv6_sock_mc_join = ipv6_sock_mc_join,
836         .ipv6_sock_mc_drop = ipv6_sock_mc_drop,
837         .ipv6_dst_lookup = ip6_dst_lookup,
838         .udpv6_encap_enable = udpv6_encap_enable,
839         .ndisc_send_na = ndisc_send_na,
840         .nd_tbl = &nd_tbl,
841 };
842 
843 static int __init inet6_init(void)
844 {
845         struct list_head *r;
846         int err = 0;
847 
848         sock_skb_cb_check_size(sizeof(struct inet6_skb_parm));
849 
850         /* Register the socket-side information for inet6_create.  */
851         for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
852                 INIT_LIST_HEAD(r);
853 
854         if (disable_ipv6_mod) {
855                 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
856                 goto out;
857         }
858 
859         err = proto_register(&tcpv6_prot, 1);
860         if (err)
861                 goto out;
862 
863         err = proto_register(&udpv6_prot, 1);
864         if (err)
865                 goto out_unregister_tcp_proto;
866 
867         err = proto_register(&udplitev6_prot, 1);
868         if (err)
869                 goto out_unregister_udp_proto;
870 
871         err = proto_register(&rawv6_prot, 1);
872         if (err)
873                 goto out_unregister_udplite_proto;
874 
875         err = proto_register(&pingv6_prot, 1);
876         if (err)
877                 goto out_unregister_ping_proto;
878 
879         /* We MUST register RAW sockets before we create the ICMP6,
880          * IGMP6, or NDISC control sockets.
881          */
882         err = rawv6_init();
883         if (err)
884                 goto out_unregister_raw_proto;
885 
886         /* Register the family here so that the init calls below will
887          * be able to create sockets. (?? is this dangerous ??)
888          */
889         err = sock_register(&inet6_family_ops);
890         if (err)
891                 goto out_sock_register_fail;
892 
893         /*
894          *      ipngwg API draft makes clear that the correct semantics
895          *      for TCP and UDP is to consider one TCP and UDP instance
896          *      in a host available by both INET and INET6 APIs and
897          *      able to communicate via both network protocols.
898          */
899 
900         err = register_pernet_subsys(&inet6_net_ops);
901         if (err)
902                 goto register_pernet_fail;
903         err = icmpv6_init();
904         if (err)
905                 goto icmp_fail;
906         err = ip6_mr_init();
907         if (err)
908                 goto ipmr_fail;
909         err = ndisc_init();
910         if (err)
911                 goto ndisc_fail;
912         err = igmp6_init();
913         if (err)
914                 goto igmp_fail;
915 
916         ipv6_stub = &ipv6_stub_impl;
917 
918         err = ipv6_netfilter_init();
919         if (err)
920                 goto netfilter_fail;
921         /* Create /proc/foo6 entries. */
922 #ifdef CONFIG_PROC_FS
923         err = -ENOMEM;
924         if (raw6_proc_init())
925                 goto proc_raw6_fail;
926         if (udplite6_proc_init())
927                 goto proc_udplite6_fail;
928         if (ipv6_misc_proc_init())
929                 goto proc_misc6_fail;
930         if (if6_proc_init())
931                 goto proc_if6_fail;
932 #endif
933         err = ip6_route_init();
934         if (err)
935                 goto ip6_route_fail;
936         err = ndisc_late_init();
937         if (err)
938                 goto ndisc_late_fail;
939         err = ip6_flowlabel_init();
940         if (err)
941                 goto ip6_flowlabel_fail;
942         err = addrconf_init();
943         if (err)
944                 goto addrconf_fail;
945 
946         /* Init v6 extension headers. */
947         err = ipv6_exthdrs_init();
948         if (err)
949                 goto ipv6_exthdrs_fail;
950 
951         err = ipv6_frag_init();
952         if (err)
953                 goto ipv6_frag_fail;
954 
955         /* Init v6 transport protocols. */
956         err = udpv6_init();
957         if (err)
958                 goto udpv6_fail;
959 
960         err = udplitev6_init();
961         if (err)
962                 goto udplitev6_fail;
963 
964         err = udpv6_offload_init();
965         if (err)
966                 goto udpv6_offload_fail;
967 
968         err = tcpv6_init();
969         if (err)
970                 goto tcpv6_fail;
971 
972         err = ipv6_packet_init();
973         if (err)
974                 goto ipv6_packet_fail;
975 
976         err = pingv6_init();
977         if (err)
978                 goto pingv6_fail;
979 
980 #ifdef CONFIG_SYSCTL
981         err = ipv6_sysctl_register();
982         if (err)
983                 goto sysctl_fail;
984 #endif
985 out:
986         return err;
987 
988 #ifdef CONFIG_SYSCTL
989 sysctl_fail:
990         pingv6_exit();
991 #endif
992 pingv6_fail:
993         ipv6_packet_cleanup();
994 ipv6_packet_fail:
995         tcpv6_exit();
996 tcpv6_fail:
997         udpv6_offload_exit();
998 udpv6_offload_fail:
999         udplitev6_exit();
1000 udplitev6_fail:
1001         udpv6_exit();
1002 udpv6_fail:
1003         ipv6_frag_exit();
1004 ipv6_frag_fail:
1005         ipv6_exthdrs_exit();
1006 ipv6_exthdrs_fail:
1007         addrconf_cleanup();
1008 addrconf_fail:
1009         ip6_flowlabel_cleanup();
1010 ip6_flowlabel_fail:
1011         ndisc_late_cleanup();
1012 ndisc_late_fail:
1013         ip6_route_cleanup();
1014 ip6_route_fail:
1015 #ifdef CONFIG_PROC_FS
1016         if6_proc_exit();
1017 proc_if6_fail:
1018         ipv6_misc_proc_exit();
1019 proc_misc6_fail:
1020         udplite6_proc_exit();
1021 proc_udplite6_fail:
1022         raw6_proc_exit();
1023 proc_raw6_fail:
1024 #endif
1025         ipv6_netfilter_fini();
1026 netfilter_fail:
1027         igmp6_cleanup();
1028 igmp_fail:
1029         ndisc_cleanup();
1030 ndisc_fail:
1031         ip6_mr_cleanup();
1032 ipmr_fail:
1033         icmpv6_cleanup();
1034 icmp_fail:
1035         unregister_pernet_subsys(&inet6_net_ops);
1036 register_pernet_fail:
1037         sock_unregister(PF_INET6);
1038         rtnl_unregister_all(PF_INET6);
1039 out_sock_register_fail:
1040         rawv6_exit();
1041 out_unregister_ping_proto:
1042         proto_unregister(&pingv6_prot);
1043 out_unregister_raw_proto:
1044         proto_unregister(&rawv6_prot);
1045 out_unregister_udplite_proto:
1046         proto_unregister(&udplitev6_prot);
1047 out_unregister_udp_proto:
1048         proto_unregister(&udpv6_prot);
1049 out_unregister_tcp_proto:
1050         proto_unregister(&tcpv6_prot);
1051         goto out;
1052 }
1053 module_init(inet6_init);
1054 
1055 MODULE_ALIAS_NETPROTO(PF_INET6);
1056 

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