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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 #include <net/calipso.h>
 64 #include <net/seg6.h>
 65 
 66 #include <linux/uaccess.h>
 67 #include <linux/mroute6.h>
 68 
 69 #include "ip6_offload.h"
 70 
 71 MODULE_AUTHOR("Cast of dozens");
 72 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
 73 MODULE_LICENSE("GPL");
 74 
 75 /* The inetsw6 table contains everything that inet6_create needs to
 76  * build a new socket.
 77  */
 78 static struct list_head inetsw6[SOCK_MAX];
 79 static DEFINE_SPINLOCK(inetsw6_lock);
 80 
 81 struct ipv6_params ipv6_defaults = {
 82         .disable_ipv6 = 0,
 83         .autoconf = 1,
 84 };
 85 
 86 static int disable_ipv6_mod;
 87 
 88 module_param_named(disable, disable_ipv6_mod, int, 0444);
 89 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
 90 
 91 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
 92 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
 93 
 94 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
 95 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
 96 
 97 bool ipv6_mod_enabled(void)
 98 {
 99         return disable_ipv6_mod == 0;
100 }
101 EXPORT_SYMBOL_GPL(ipv6_mod_enabled);
102 
103 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
104 {
105         const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
106 
107         return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
108 }
109 
110 static int inet6_create(struct net *net, struct socket *sock, int protocol,
111                         int kern)
112 {
113         struct inet_sock *inet;
114         struct ipv6_pinfo *np;
115         struct sock *sk;
116         struct inet_protosw *answer;
117         struct proto *answer_prot;
118         unsigned char answer_flags;
119         int try_loading_module = 0;
120         int err;
121 
122         if (protocol < 0 || protocol >= IPPROTO_MAX)
123                 return -EINVAL;
124 
125         /* Look for the requested type/protocol pair. */
126 lookup_protocol:
127         err = -ESOCKTNOSUPPORT;
128         rcu_read_lock();
129         list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
130 
131                 err = 0;
132                 /* Check the non-wild match. */
133                 if (protocol == answer->protocol) {
134                         if (protocol != IPPROTO_IP)
135                                 break;
136                 } else {
137                         /* Check for the two wild cases. */
138                         if (IPPROTO_IP == protocol) {
139                                 protocol = answer->protocol;
140                                 break;
141                         }
142                         if (IPPROTO_IP == answer->protocol)
143                                 break;
144                 }
145                 err = -EPROTONOSUPPORT;
146         }
147 
148         if (err) {
149                 if (try_loading_module < 2) {
150                         rcu_read_unlock();
151                         /*
152                          * Be more specific, e.g. net-pf-10-proto-132-type-1
153                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
154                          */
155                         if (++try_loading_module == 1)
156                                 request_module("net-pf-%d-proto-%d-type-%d",
157                                                 PF_INET6, protocol, sock->type);
158                         /*
159                          * Fall back to generic, e.g. net-pf-10-proto-132
160                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
161                          */
162                         else
163                                 request_module("net-pf-%d-proto-%d",
164                                                 PF_INET6, protocol);
165                         goto lookup_protocol;
166                 } else
167                         goto out_rcu_unlock;
168         }
169 
170         err = -EPERM;
171         if (sock->type == SOCK_RAW && !kern &&
172             !ns_capable(net->user_ns, CAP_NET_RAW))
173                 goto out_rcu_unlock;
174 
175         sock->ops = answer->ops;
176         answer_prot = answer->prot;
177         answer_flags = answer->flags;
178         rcu_read_unlock();
179 
180         WARN_ON(!answer_prot->slab);
181 
182         err = -ENOBUFS;
183         sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern);
184         if (!sk)
185                 goto out;
186 
187         sock_init_data(sock, sk);
188 
189         err = 0;
190         if (INET_PROTOSW_REUSE & answer_flags)
191                 sk->sk_reuse = SK_CAN_REUSE;
192 
193         inet = inet_sk(sk);
194         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
195 
196         if (SOCK_RAW == sock->type) {
197                 inet->inet_num = protocol;
198                 if (IPPROTO_RAW == protocol)
199                         inet->hdrincl = 1;
200         }
201 
202         sk->sk_destruct         = inet_sock_destruct;
203         sk->sk_family           = PF_INET6;
204         sk->sk_protocol         = protocol;
205 
206         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
207 
208         inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
209         np->hop_limit   = -1;
210         np->mcast_hops  = IPV6_DEFAULT_MCASTHOPS;
211         np->mc_loop     = 1;
212         np->pmtudisc    = IPV6_PMTUDISC_WANT;
213         np->repflow     = net->ipv6.sysctl.flowlabel_reflect;
214         sk->sk_ipv6only = net->ipv6.sysctl.bindv6only;
215 
216         /* Init the ipv4 part of the socket since we can have sockets
217          * using v6 API for ipv4.
218          */
219         inet->uc_ttl    = -1;
220 
221         inet->mc_loop   = 1;
222         inet->mc_ttl    = 1;
223         inet->mc_index  = 0;
224         inet->mc_list   = NULL;
225         inet->rcv_tos   = 0;
226 
227         if (net->ipv4.sysctl_ip_no_pmtu_disc)
228                 inet->pmtudisc = IP_PMTUDISC_DONT;
229         else
230                 inet->pmtudisc = IP_PMTUDISC_WANT;
231         /*
232          * Increment only the relevant sk_prot->socks debug field, this changes
233          * the previous behaviour of incrementing both the equivalent to
234          * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
235          *
236          * This allows better debug granularity as we'll know exactly how many
237          * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
238          * transport protocol socks. -acme
239          */
240         sk_refcnt_debug_inc(sk);
241 
242         if (inet->inet_num) {
243                 /* It assumes that any protocol which allows
244                  * the user to assign a number at socket
245                  * creation time automatically shares.
246                  */
247                 inet->inet_sport = htons(inet->inet_num);
248                 err = sk->sk_prot->hash(sk);
249                 if (err) {
250                         sk_common_release(sk);
251                         goto out;
252                 }
253         }
254         if (sk->sk_prot->init) {
255                 err = sk->sk_prot->init(sk);
256                 if (err) {
257                         sk_common_release(sk);
258                         goto out;
259                 }
260         }
261 
262         if (!kern) {
263                 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
264                 if (err) {
265                         sk_common_release(sk);
266                         goto out;
267                 }
268         }
269 out:
270         return err;
271 out_rcu_unlock:
272         rcu_read_unlock();
273         goto out;
274 }
275 
276 static int __inet6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
277                         bool force_bind_address_no_port, bool with_lock)
278 {
279         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
280         struct inet_sock *inet = inet_sk(sk);
281         struct ipv6_pinfo *np = inet6_sk(sk);
282         struct net *net = sock_net(sk);
283         __be32 v4addr = 0;
284         unsigned short snum;
285         bool saved_ipv6only;
286         int addr_type = 0;
287         int err = 0;
288 
289         if (addr->sin6_family != AF_INET6)
290                 return -EAFNOSUPPORT;
291 
292         addr_type = ipv6_addr_type(&addr->sin6_addr);
293         if ((addr_type & IPV6_ADDR_MULTICAST) && sk->sk_type == SOCK_STREAM)
294                 return -EINVAL;
295 
296         snum = ntohs(addr->sin6_port);
297         if (snum && snum < inet_prot_sock(net) &&
298             !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
299                 return -EACCES;
300 
301         if (with_lock)
302                 lock_sock(sk);
303 
304         /* Check these errors (active socket, double bind). */
305         if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
306                 err = -EINVAL;
307                 goto out;
308         }
309 
310         /* Check if the address belongs to the host. */
311         if (addr_type == IPV6_ADDR_MAPPED) {
312                 int chk_addr_ret;
313 
314                 /* Binding to v4-mapped address on a v6-only socket
315                  * makes no sense
316                  */
317                 if (sk->sk_ipv6only) {
318                         err = -EINVAL;
319                         goto out;
320                 }
321 
322                 /* Reproduce AF_INET checks to make the bindings consistent */
323                 v4addr = addr->sin6_addr.s6_addr32[3];
324                 chk_addr_ret = inet_addr_type(net, v4addr);
325                 if (!inet_can_nonlocal_bind(net, inet) &&
326                     v4addr != htonl(INADDR_ANY) &&
327                     chk_addr_ret != RTN_LOCAL &&
328                     chk_addr_ret != RTN_MULTICAST &&
329                     chk_addr_ret != RTN_BROADCAST) {
330                         err = -EADDRNOTAVAIL;
331                         goto out;
332                 }
333         } else {
334                 if (addr_type != IPV6_ADDR_ANY) {
335                         struct net_device *dev = NULL;
336 
337                         rcu_read_lock();
338                         if (__ipv6_addr_needs_scope_id(addr_type)) {
339                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
340                                     addr->sin6_scope_id) {
341                                         /* Override any existing binding, if another one
342                                          * is supplied by user.
343                                          */
344                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
345                                 }
346 
347                                 /* Binding to link-local address requires an interface */
348                                 if (!sk->sk_bound_dev_if) {
349                                         err = -EINVAL;
350                                         goto out_unlock;
351                                 }
352                                 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
353                                 if (!dev) {
354                                         err = -ENODEV;
355                                         goto out_unlock;
356                                 }
357                         }
358 
359                         /* ipv4 addr of the socket is invalid.  Only the
360                          * unspecified and mapped address have a v4 equivalent.
361                          */
362                         v4addr = LOOPBACK4_IPV6;
363                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
364                                 if (!ipv6_can_nonlocal_bind(net, inet) &&
365                                     !ipv6_chk_addr(net, &addr->sin6_addr,
366                                                    dev, 0)) {
367                                         err = -EADDRNOTAVAIL;
368                                         goto out_unlock;
369                                 }
370                         }
371                         rcu_read_unlock();
372                 }
373         }
374 
375         inet->inet_rcv_saddr = v4addr;
376         inet->inet_saddr = v4addr;
377 
378         sk->sk_v6_rcv_saddr = addr->sin6_addr;
379 
380         if (!(addr_type & IPV6_ADDR_MULTICAST))
381                 np->saddr = addr->sin6_addr;
382 
383         saved_ipv6only = sk->sk_ipv6only;
384         if (addr_type != IPV6_ADDR_ANY && addr_type != IPV6_ADDR_MAPPED)
385                 sk->sk_ipv6only = 1;
386 
387         /* Make sure we are allowed to bind here. */
388         if (snum || !(inet->bind_address_no_port ||
389                       force_bind_address_no_port)) {
390                 if (sk->sk_prot->get_port(sk, snum)) {
391                         sk->sk_ipv6only = saved_ipv6only;
392                         inet_reset_saddr(sk);
393                         err = -EADDRINUSE;
394                         goto out;
395                 }
396                 err = BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk);
397                 if (err) {
398                         sk->sk_ipv6only = saved_ipv6only;
399                         inet_reset_saddr(sk);
400                         goto out;
401                 }
402         }
403 
404         if (addr_type != IPV6_ADDR_ANY)
405                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
406         if (snum)
407                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
408         inet->inet_sport = htons(inet->inet_num);
409         inet->inet_dport = 0;
410         inet->inet_daddr = 0;
411 out:
412         if (with_lock)
413                 release_sock(sk);
414         return err;
415 out_unlock:
416         rcu_read_unlock();
417         goto out;
418 }
419 
420 /* bind for INET6 API */
421 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
422 {
423         struct sock *sk = sock->sk;
424         int err = 0;
425 
426         /* If the socket has its own bind function then use it. */
427         if (sk->sk_prot->bind)
428                 return sk->sk_prot->bind(sk, uaddr, addr_len);
429 
430         if (addr_len < SIN6_LEN_RFC2133)
431                 return -EINVAL;
432 
433         /* BPF prog is run before any checks are done so that if the prog
434          * changes context in a wrong way it will be caught.
435          */
436         err = BPF_CGROUP_RUN_PROG_INET6_BIND(sk, uaddr);
437         if (err)
438                 return err;
439 
440         return __inet6_bind(sk, uaddr, addr_len, false, true);
441 }
442 EXPORT_SYMBOL(inet6_bind);
443 
444 int inet6_release(struct socket *sock)
445 {
446         struct sock *sk = sock->sk;
447 
448         if (!sk)
449                 return -EINVAL;
450 
451         /* Free mc lists */
452         ipv6_sock_mc_close(sk);
453 
454         /* Free ac lists */
455         ipv6_sock_ac_close(sk);
456 
457         return inet_release(sock);
458 }
459 EXPORT_SYMBOL(inet6_release);
460 
461 void inet6_destroy_sock(struct sock *sk)
462 {
463         struct ipv6_pinfo *np = inet6_sk(sk);
464         struct sk_buff *skb;
465         struct ipv6_txoptions *opt;
466 
467         /* Release rx options */
468 
469         skb = xchg(&np->pktoptions, NULL);
470         if (skb)
471                 kfree_skb(skb);
472 
473         skb = xchg(&np->rxpmtu, NULL);
474         if (skb)
475                 kfree_skb(skb);
476 
477         /* Free flowlabels */
478         fl6_free_socklist(sk);
479 
480         /* Free tx options */
481 
482         opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL);
483         if (opt) {
484                 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
485                 txopt_put(opt);
486         }
487 }
488 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
489 
490 /*
491  *      This does both peername and sockname.
492  */
493 
494 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
495                  int peer)
496 {
497         struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
498         struct sock *sk = sock->sk;
499         struct inet_sock *inet = inet_sk(sk);
500         struct ipv6_pinfo *np = inet6_sk(sk);
501 
502         sin->sin6_family = AF_INET6;
503         sin->sin6_flowinfo = 0;
504         sin->sin6_scope_id = 0;
505         if (peer) {
506                 if (!inet->inet_dport)
507                         return -ENOTCONN;
508                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
509                     peer == 1)
510                         return -ENOTCONN;
511                 sin->sin6_port = inet->inet_dport;
512                 sin->sin6_addr = sk->sk_v6_daddr;
513                 if (np->sndflow)
514                         sin->sin6_flowinfo = np->flow_label;
515         } else {
516                 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
517                         sin->sin6_addr = np->saddr;
518                 else
519                         sin->sin6_addr = sk->sk_v6_rcv_saddr;
520 
521                 sin->sin6_port = inet->inet_sport;
522         }
523         sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
524                                                  sk->sk_bound_dev_if);
525         return sizeof(*sin);
526 }
527 EXPORT_SYMBOL(inet6_getname);
528 
529 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
530 {
531         struct sock *sk = sock->sk;
532         struct net *net = sock_net(sk);
533 
534         switch (cmd) {
535         case SIOCGSTAMP:
536                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
537 
538         case SIOCGSTAMPNS:
539                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
540 
541         case SIOCADDRT:
542         case SIOCDELRT:
543 
544                 return ipv6_route_ioctl(net, cmd, (void __user *)arg);
545 
546         case SIOCSIFADDR:
547                 return addrconf_add_ifaddr(net, (void __user *) arg);
548         case SIOCDIFADDR:
549                 return addrconf_del_ifaddr(net, (void __user *) arg);
550         case SIOCSIFDSTADDR:
551                 return addrconf_set_dstaddr(net, (void __user *) arg);
552         default:
553                 if (!sk->sk_prot->ioctl)
554                         return -ENOIOCTLCMD;
555                 return sk->sk_prot->ioctl(sk, cmd, arg);
556         }
557         /*NOTREACHED*/
558         return 0;
559 }
560 EXPORT_SYMBOL(inet6_ioctl);
561 
562 const struct proto_ops inet6_stream_ops = {
563         .family            = PF_INET6,
564         .owner             = THIS_MODULE,
565         .release           = inet6_release,
566         .bind              = inet6_bind,
567         .connect           = inet_stream_connect,       /* ok           */
568         .socketpair        = sock_no_socketpair,        /* a do nothing */
569         .accept            = inet_accept,               /* ok           */
570         .getname           = inet6_getname,
571         .poll              = tcp_poll,                  /* ok           */
572         .ioctl             = inet6_ioctl,               /* must change  */
573         .listen            = inet_listen,               /* ok           */
574         .shutdown          = inet_shutdown,             /* ok           */
575         .setsockopt        = sock_common_setsockopt,    /* ok           */
576         .getsockopt        = sock_common_getsockopt,    /* ok           */
577         .sendmsg           = inet_sendmsg,              /* ok           */
578         .recvmsg           = inet_recvmsg,              /* ok           */
579 #ifdef CONFIG_MMU
580         .mmap              = tcp_mmap,
581 #endif
582         .sendpage          = inet_sendpage,
583         .sendmsg_locked    = tcp_sendmsg_locked,
584         .sendpage_locked   = tcp_sendpage_locked,
585         .splice_read       = tcp_splice_read,
586         .read_sock         = tcp_read_sock,
587         .peek_len          = tcp_peek_len,
588 #ifdef CONFIG_COMPAT
589         .compat_setsockopt = compat_sock_common_setsockopt,
590         .compat_getsockopt = compat_sock_common_getsockopt,
591 #endif
592         .set_rcvlowat      = tcp_set_rcvlowat,
593 };
594 
595 const struct proto_ops inet6_dgram_ops = {
596         .family            = PF_INET6,
597         .owner             = THIS_MODULE,
598         .release           = inet6_release,
599         .bind              = inet6_bind,
600         .connect           = inet_dgram_connect,        /* ok           */
601         .socketpair        = sock_no_socketpair,        /* a do nothing */
602         .accept            = sock_no_accept,            /* a do nothing */
603         .getname           = inet6_getname,
604         .poll              = udp_poll,                  /* ok           */
605         .ioctl             = inet6_ioctl,               /* must change  */
606         .listen            = sock_no_listen,            /* ok           */
607         .shutdown          = inet_shutdown,             /* ok           */
608         .setsockopt        = sock_common_setsockopt,    /* ok           */
609         .getsockopt        = sock_common_getsockopt,    /* ok           */
610         .sendmsg           = inet_sendmsg,              /* ok           */
611         .recvmsg           = inet_recvmsg,              /* ok           */
612         .mmap              = sock_no_mmap,
613         .sendpage          = sock_no_sendpage,
614         .set_peek_off      = sk_set_peek_off,
615 #ifdef CONFIG_COMPAT
616         .compat_setsockopt = compat_sock_common_setsockopt,
617         .compat_getsockopt = compat_sock_common_getsockopt,
618 #endif
619 };
620 
621 static const struct net_proto_family inet6_family_ops = {
622         .family = PF_INET6,
623         .create = inet6_create,
624         .owner  = THIS_MODULE,
625 };
626 
627 int inet6_register_protosw(struct inet_protosw *p)
628 {
629         struct list_head *lh;
630         struct inet_protosw *answer;
631         struct list_head *last_perm;
632         int protocol = p->protocol;
633         int ret;
634 
635         spin_lock_bh(&inetsw6_lock);
636 
637         ret = -EINVAL;
638         if (p->type >= SOCK_MAX)
639                 goto out_illegal;
640 
641         /* If we are trying to override a permanent protocol, bail. */
642         answer = NULL;
643         ret = -EPERM;
644         last_perm = &inetsw6[p->type];
645         list_for_each(lh, &inetsw6[p->type]) {
646                 answer = list_entry(lh, struct inet_protosw, list);
647 
648                 /* Check only the non-wild match. */
649                 if (INET_PROTOSW_PERMANENT & answer->flags) {
650                         if (protocol == answer->protocol)
651                                 break;
652                         last_perm = lh;
653                 }
654 
655                 answer = NULL;
656         }
657         if (answer)
658                 goto out_permanent;
659 
660         /* Add the new entry after the last permanent entry if any, so that
661          * the new entry does not override a permanent entry when matched with
662          * a wild-card protocol. But it is allowed to override any existing
663          * non-permanent entry.  This means that when we remove this entry, the
664          * system automatically returns to the old behavior.
665          */
666         list_add_rcu(&p->list, last_perm);
667         ret = 0;
668 out:
669         spin_unlock_bh(&inetsw6_lock);
670         return ret;
671 
672 out_permanent:
673         pr_err("Attempt to override permanent protocol %d\n", protocol);
674         goto out;
675 
676 out_illegal:
677         pr_err("Ignoring attempt to register invalid socket type %d\n",
678                p->type);
679         goto out;
680 }
681 EXPORT_SYMBOL(inet6_register_protosw);
682 
683 void
684 inet6_unregister_protosw(struct inet_protosw *p)
685 {
686         if (INET_PROTOSW_PERMANENT & p->flags) {
687                 pr_err("Attempt to unregister permanent protocol %d\n",
688                        p->protocol);
689         } else {
690                 spin_lock_bh(&inetsw6_lock);
691                 list_del_rcu(&p->list);
692                 spin_unlock_bh(&inetsw6_lock);
693 
694                 synchronize_net();
695         }
696 }
697 EXPORT_SYMBOL(inet6_unregister_protosw);
698 
699 int inet6_sk_rebuild_header(struct sock *sk)
700 {
701         struct ipv6_pinfo *np = inet6_sk(sk);
702         struct dst_entry *dst;
703 
704         dst = __sk_dst_check(sk, np->dst_cookie);
705 
706         if (!dst) {
707                 struct inet_sock *inet = inet_sk(sk);
708                 struct in6_addr *final_p, final;
709                 struct flowi6 fl6;
710 
711                 memset(&fl6, 0, sizeof(fl6));
712                 fl6.flowi6_proto = sk->sk_protocol;
713                 fl6.daddr = sk->sk_v6_daddr;
714                 fl6.saddr = np->saddr;
715                 fl6.flowlabel = np->flow_label;
716                 fl6.flowi6_oif = sk->sk_bound_dev_if;
717                 fl6.flowi6_mark = sk->sk_mark;
718                 fl6.fl6_dport = inet->inet_dport;
719                 fl6.fl6_sport = inet->inet_sport;
720                 fl6.flowi6_uid = sk->sk_uid;
721                 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
722 
723                 rcu_read_lock();
724                 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt),
725                                          &final);
726                 rcu_read_unlock();
727 
728                 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
729                 if (IS_ERR(dst)) {
730                         sk->sk_route_caps = 0;
731                         sk->sk_err_soft = -PTR_ERR(dst);
732                         return PTR_ERR(dst);
733                 }
734 
735                 ip6_dst_store(sk, dst, NULL, NULL);
736         }
737 
738         return 0;
739 }
740 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
741 
742 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
743                        const struct inet6_skb_parm *opt)
744 {
745         const struct ipv6_pinfo *np = inet6_sk(sk);
746 
747         if (np->rxopt.all) {
748                 if (((opt->flags & IP6SKB_HOPBYHOP) &&
749                      (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) ||
750                     (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) &&
751                      np->rxopt.bits.rxflow) ||
752                     (opt->srcrt && (np->rxopt.bits.srcrt ||
753                      np->rxopt.bits.osrcrt)) ||
754                     ((opt->dst1 || opt->dst0) &&
755                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
756                         return true;
757         }
758         return false;
759 }
760 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
761 
762 static struct packet_type ipv6_packet_type __read_mostly = {
763         .type = cpu_to_be16(ETH_P_IPV6),
764         .func = ipv6_rcv,
765         .list_func = ipv6_list_rcv,
766 };
767 
768 static int __init ipv6_packet_init(void)
769 {
770         dev_add_pack(&ipv6_packet_type);
771         return 0;
772 }
773 
774 static void ipv6_packet_cleanup(void)
775 {
776         dev_remove_pack(&ipv6_packet_type);
777 }
778 
779 static int __net_init ipv6_init_mibs(struct net *net)
780 {
781         int i;
782 
783         net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib);
784         if (!net->mib.udp_stats_in6)
785                 return -ENOMEM;
786         net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib);
787         if (!net->mib.udplite_stats_in6)
788                 goto err_udplite_mib;
789         net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib);
790         if (!net->mib.ipv6_statistics)
791                 goto err_ip_mib;
792 
793         for_each_possible_cpu(i) {
794                 struct ipstats_mib *af_inet6_stats;
795                 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i);
796                 u64_stats_init(&af_inet6_stats->syncp);
797         }
798 
799 
800         net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib);
801         if (!net->mib.icmpv6_statistics)
802                 goto err_icmp_mib;
803         net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
804                                                 GFP_KERNEL);
805         if (!net->mib.icmpv6msg_statistics)
806                 goto err_icmpmsg_mib;
807         return 0;
808 
809 err_icmpmsg_mib:
810         free_percpu(net->mib.icmpv6_statistics);
811 err_icmp_mib:
812         free_percpu(net->mib.ipv6_statistics);
813 err_ip_mib:
814         free_percpu(net->mib.udplite_stats_in6);
815 err_udplite_mib:
816         free_percpu(net->mib.udp_stats_in6);
817         return -ENOMEM;
818 }
819 
820 static void ipv6_cleanup_mibs(struct net *net)
821 {
822         free_percpu(net->mib.udp_stats_in6);
823         free_percpu(net->mib.udplite_stats_in6);
824         free_percpu(net->mib.ipv6_statistics);
825         free_percpu(net->mib.icmpv6_statistics);
826         kfree(net->mib.icmpv6msg_statistics);
827 }
828 
829 static int __net_init inet6_net_init(struct net *net)
830 {
831         int err = 0;
832 
833         net->ipv6.sysctl.bindv6only = 0;
834         net->ipv6.sysctl.icmpv6_time = 1*HZ;
835         net->ipv6.sysctl.icmpv6_echo_ignore_all = 0;
836         net->ipv6.sysctl.flowlabel_consistency = 1;
837         net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS;
838         net->ipv6.sysctl.idgen_retries = 3;
839         net->ipv6.sysctl.idgen_delay = 1 * HZ;
840         net->ipv6.sysctl.flowlabel_state_ranges = 0;
841         net->ipv6.sysctl.max_dst_opts_cnt = IP6_DEFAULT_MAX_DST_OPTS_CNT;
842         net->ipv6.sysctl.max_hbh_opts_cnt = IP6_DEFAULT_MAX_HBH_OPTS_CNT;
843         net->ipv6.sysctl.max_dst_opts_len = IP6_DEFAULT_MAX_DST_OPTS_LEN;
844         net->ipv6.sysctl.max_hbh_opts_len = IP6_DEFAULT_MAX_HBH_OPTS_LEN;
845         atomic_set(&net->ipv6.fib6_sernum, 1);
846 
847         err = ipv6_init_mibs(net);
848         if (err)
849                 return err;
850 #ifdef CONFIG_PROC_FS
851         err = udp6_proc_init(net);
852         if (err)
853                 goto out;
854         err = tcp6_proc_init(net);
855         if (err)
856                 goto proc_tcp6_fail;
857         err = ac6_proc_init(net);
858         if (err)
859                 goto proc_ac6_fail;
860 #endif
861         return err;
862 
863 #ifdef CONFIG_PROC_FS
864 proc_ac6_fail:
865         tcp6_proc_exit(net);
866 proc_tcp6_fail:
867         udp6_proc_exit(net);
868 out:
869         ipv6_cleanup_mibs(net);
870         return err;
871 #endif
872 }
873 
874 static void __net_exit inet6_net_exit(struct net *net)
875 {
876 #ifdef CONFIG_PROC_FS
877         udp6_proc_exit(net);
878         tcp6_proc_exit(net);
879         ac6_proc_exit(net);
880 #endif
881         ipv6_cleanup_mibs(net);
882 }
883 
884 static struct pernet_operations inet6_net_ops = {
885         .init = inet6_net_init,
886         .exit = inet6_net_exit,
887 };
888 
889 static const struct ipv6_stub ipv6_stub_impl = {
890         .ipv6_sock_mc_join = ipv6_sock_mc_join,
891         .ipv6_sock_mc_drop = ipv6_sock_mc_drop,
892         .ipv6_dst_lookup   = ip6_dst_lookup,
893         .fib6_get_table    = fib6_get_table,
894         .fib6_table_lookup = fib6_table_lookup,
895         .fib6_lookup       = fib6_lookup,
896         .fib6_multipath_select = fib6_multipath_select,
897         .ip6_mtu_from_fib6 = ip6_mtu_from_fib6,
898         .udpv6_encap_enable = udpv6_encap_enable,
899         .ndisc_send_na = ndisc_send_na,
900         .nd_tbl = &nd_tbl,
901 };
902 
903 static const struct ipv6_bpf_stub ipv6_bpf_stub_impl = {
904         .inet6_bind = __inet6_bind,
905 };
906 
907 static int __init inet6_init(void)
908 {
909         struct list_head *r;
910         int err = 0;
911 
912         sock_skb_cb_check_size(sizeof(struct inet6_skb_parm));
913 
914         /* Register the socket-side information for inet6_create.  */
915         for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
916                 INIT_LIST_HEAD(r);
917 
918         if (disable_ipv6_mod) {
919                 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
920                 goto out;
921         }
922 
923         err = proto_register(&tcpv6_prot, 1);
924         if (err)
925                 goto out;
926 
927         err = proto_register(&udpv6_prot, 1);
928         if (err)
929                 goto out_unregister_tcp_proto;
930 
931         err = proto_register(&udplitev6_prot, 1);
932         if (err)
933                 goto out_unregister_udp_proto;
934 
935         err = proto_register(&rawv6_prot, 1);
936         if (err)
937                 goto out_unregister_udplite_proto;
938 
939         err = proto_register(&pingv6_prot, 1);
940         if (err)
941                 goto out_unregister_raw_proto;
942 
943         /* We MUST register RAW sockets before we create the ICMP6,
944          * IGMP6, or NDISC control sockets.
945          */
946         err = rawv6_init();
947         if (err)
948                 goto out_unregister_ping_proto;
949 
950         /* Register the family here so that the init calls below will
951          * be able to create sockets. (?? is this dangerous ??)
952          */
953         err = sock_register(&inet6_family_ops);
954         if (err)
955                 goto out_sock_register_fail;
956 
957         /*
958          *      ipngwg API draft makes clear that the correct semantics
959          *      for TCP and UDP is to consider one TCP and UDP instance
960          *      in a host available by both INET and INET6 APIs and
961          *      able to communicate via both network protocols.
962          */
963 
964         err = register_pernet_subsys(&inet6_net_ops);
965         if (err)
966                 goto register_pernet_fail;
967         err = ip6_mr_init();
968         if (err)
969                 goto ipmr_fail;
970         err = icmpv6_init();
971         if (err)
972                 goto icmp_fail;
973         err = ndisc_init();
974         if (err)
975                 goto ndisc_fail;
976         err = igmp6_init();
977         if (err)
978                 goto igmp_fail;
979 
980         err = ipv6_netfilter_init();
981         if (err)
982                 goto netfilter_fail;
983         /* Create /proc/foo6 entries. */
984 #ifdef CONFIG_PROC_FS
985         err = -ENOMEM;
986         if (raw6_proc_init())
987                 goto proc_raw6_fail;
988         if (udplite6_proc_init())
989                 goto proc_udplite6_fail;
990         if (ipv6_misc_proc_init())
991                 goto proc_misc6_fail;
992         if (if6_proc_init())
993                 goto proc_if6_fail;
994 #endif
995         err = ip6_route_init();
996         if (err)
997                 goto ip6_route_fail;
998         err = ndisc_late_init();
999         if (err)
1000                 goto ndisc_late_fail;
1001         err = ip6_flowlabel_init();
1002         if (err)
1003                 goto ip6_flowlabel_fail;
1004         err = addrconf_init();
1005         if (err)
1006                 goto addrconf_fail;
1007 
1008         /* Init v6 extension headers. */
1009         err = ipv6_exthdrs_init();
1010         if (err)
1011                 goto ipv6_exthdrs_fail;
1012 
1013         err = ipv6_frag_init();
1014         if (err)
1015                 goto ipv6_frag_fail;
1016 
1017         /* Init v6 transport protocols. */
1018         err = udpv6_init();
1019         if (err)
1020                 goto udpv6_fail;
1021 
1022         err = udplitev6_init();
1023         if (err)
1024                 goto udplitev6_fail;
1025 
1026         err = udpv6_offload_init();
1027         if (err)
1028                 goto udpv6_offload_fail;
1029 
1030         err = tcpv6_init();
1031         if (err)
1032                 goto tcpv6_fail;
1033 
1034         err = ipv6_packet_init();
1035         if (err)
1036                 goto ipv6_packet_fail;
1037 
1038         err = pingv6_init();
1039         if (err)
1040                 goto pingv6_fail;
1041 
1042         err = calipso_init();
1043         if (err)
1044                 goto calipso_fail;
1045 
1046         err = seg6_init();
1047         if (err)
1048                 goto seg6_fail;
1049 
1050         err = igmp6_late_init();
1051         if (err)
1052                 goto igmp6_late_err;
1053 
1054 #ifdef CONFIG_SYSCTL
1055         err = ipv6_sysctl_register();
1056         if (err)
1057                 goto sysctl_fail;
1058 #endif
1059 
1060         /* ensure that ipv6 stubs are visible only after ipv6 is ready */
1061         wmb();
1062         ipv6_stub = &ipv6_stub_impl;
1063         ipv6_bpf_stub = &ipv6_bpf_stub_impl;
1064 out:
1065         return err;
1066 
1067 #ifdef CONFIG_SYSCTL
1068 sysctl_fail:
1069         igmp6_late_cleanup();
1070 #endif
1071 igmp6_late_err:
1072         seg6_exit();
1073 seg6_fail:
1074         calipso_exit();
1075 calipso_fail:
1076         pingv6_exit();
1077 pingv6_fail:
1078         ipv6_packet_cleanup();
1079 ipv6_packet_fail:
1080         tcpv6_exit();
1081 tcpv6_fail:
1082         udpv6_offload_exit();
1083 udpv6_offload_fail:
1084         udplitev6_exit();
1085 udplitev6_fail:
1086         udpv6_exit();
1087 udpv6_fail:
1088         ipv6_frag_exit();
1089 ipv6_frag_fail:
1090         ipv6_exthdrs_exit();
1091 ipv6_exthdrs_fail:
1092         addrconf_cleanup();
1093 addrconf_fail:
1094         ip6_flowlabel_cleanup();
1095 ip6_flowlabel_fail:
1096         ndisc_late_cleanup();
1097 ndisc_late_fail:
1098         ip6_route_cleanup();
1099 ip6_route_fail:
1100 #ifdef CONFIG_PROC_FS
1101         if6_proc_exit();
1102 proc_if6_fail:
1103         ipv6_misc_proc_exit();
1104 proc_misc6_fail:
1105         udplite6_proc_exit();
1106 proc_udplite6_fail:
1107         raw6_proc_exit();
1108 proc_raw6_fail:
1109 #endif
1110         ipv6_netfilter_fini();
1111 netfilter_fail:
1112         igmp6_cleanup();
1113 igmp_fail:
1114         ndisc_cleanup();
1115 ndisc_fail:
1116         icmpv6_cleanup();
1117 icmp_fail:
1118         ip6_mr_cleanup();
1119 ipmr_fail:
1120         unregister_pernet_subsys(&inet6_net_ops);
1121 register_pernet_fail:
1122         sock_unregister(PF_INET6);
1123         rtnl_unregister_all(PF_INET6);
1124 out_sock_register_fail:
1125         rawv6_exit();
1126 out_unregister_ping_proto:
1127         proto_unregister(&pingv6_prot);
1128 out_unregister_raw_proto:
1129         proto_unregister(&rawv6_prot);
1130 out_unregister_udplite_proto:
1131         proto_unregister(&udplitev6_prot);
1132 out_unregister_udp_proto:
1133         proto_unregister(&udpv6_prot);
1134 out_unregister_tcp_proto:
1135         proto_unregister(&tcpv6_prot);
1136         goto out;
1137 }
1138 module_init(inet6_init);
1139 
1140 MODULE_ALIAS_NETPROTO(PF_INET6);
1141 

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