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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 
277 /* bind for INET6 API */
278 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
279 {
280         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
281         struct sock *sk = sock->sk;
282         struct inet_sock *inet = inet_sk(sk);
283         struct ipv6_pinfo *np = inet6_sk(sk);
284         struct net *net = sock_net(sk);
285         __be32 v4addr = 0;
286         unsigned short snum;
287         bool saved_ipv6only;
288         int addr_type = 0;
289         int err = 0;
290 
291         /* If the socket has its own bind function then use it. */
292         if (sk->sk_prot->bind)
293                 return sk->sk_prot->bind(sk, uaddr, addr_len);
294 
295         if (addr_len < SIN6_LEN_RFC2133)
296                 return -EINVAL;
297 
298         if (addr->sin6_family != AF_INET6)
299                 return -EAFNOSUPPORT;
300 
301         addr_type = ipv6_addr_type(&addr->sin6_addr);
302         if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
303                 return -EINVAL;
304 
305         snum = ntohs(addr->sin6_port);
306         if (snum && snum < inet_prot_sock(net) &&
307             !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
308                 return -EACCES;
309 
310         lock_sock(sk);
311 
312         /* Check these errors (active socket, double bind). */
313         if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
314                 err = -EINVAL;
315                 goto out;
316         }
317 
318         /* Check if the address belongs to the host. */
319         if (addr_type == IPV6_ADDR_MAPPED) {
320                 int chk_addr_ret;
321 
322                 /* Binding to v4-mapped address on a v6-only socket
323                  * makes no sense
324                  */
325                 if (sk->sk_ipv6only) {
326                         err = -EINVAL;
327                         goto out;
328                 }
329 
330                 /* Reproduce AF_INET checks to make the bindings consistent */
331                 v4addr = addr->sin6_addr.s6_addr32[3];
332                 chk_addr_ret = inet_addr_type(net, v4addr);
333                 if (!net->ipv4.sysctl_ip_nonlocal_bind &&
334                     !(inet->freebind || inet->transparent) &&
335                     v4addr != htonl(INADDR_ANY) &&
336                     chk_addr_ret != RTN_LOCAL &&
337                     chk_addr_ret != RTN_MULTICAST &&
338                     chk_addr_ret != RTN_BROADCAST) {
339                         err = -EADDRNOTAVAIL;
340                         goto out;
341                 }
342         } else {
343                 if (addr_type != IPV6_ADDR_ANY) {
344                         struct net_device *dev = NULL;
345 
346                         rcu_read_lock();
347                         if (__ipv6_addr_needs_scope_id(addr_type)) {
348                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
349                                     addr->sin6_scope_id) {
350                                         /* Override any existing binding, if another one
351                                          * is supplied by user.
352                                          */
353                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
354                                 }
355 
356                                 /* Binding to link-local address requires an interface */
357                                 if (!sk->sk_bound_dev_if) {
358                                         err = -EINVAL;
359                                         goto out_unlock;
360                                 }
361                                 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
362                                 if (!dev) {
363                                         err = -ENODEV;
364                                         goto out_unlock;
365                                 }
366                         }
367 
368                         /* ipv4 addr of the socket is invalid.  Only the
369                          * unspecified and mapped address have a v4 equivalent.
370                          */
371                         v4addr = LOOPBACK4_IPV6;
372                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
373                                 if (!net->ipv6.sysctl.ip_nonlocal_bind &&
374                                     !(inet->freebind || inet->transparent) &&
375                                     !ipv6_chk_addr(net, &addr->sin6_addr,
376                                                    dev, 0)) {
377                                         err = -EADDRNOTAVAIL;
378                                         goto out_unlock;
379                                 }
380                         }
381                         rcu_read_unlock();
382                 }
383         }
384 
385         inet->inet_rcv_saddr = v4addr;
386         inet->inet_saddr = v4addr;
387 
388         sk->sk_v6_rcv_saddr = addr->sin6_addr;
389 
390         if (!(addr_type & IPV6_ADDR_MULTICAST))
391                 np->saddr = addr->sin6_addr;
392 
393         saved_ipv6only = sk->sk_ipv6only;
394         if (addr_type != IPV6_ADDR_ANY && addr_type != IPV6_ADDR_MAPPED)
395                 sk->sk_ipv6only = 1;
396 
397         /* Make sure we are allowed to bind here. */
398         if ((snum || !inet->bind_address_no_port) &&
399             sk->sk_prot->get_port(sk, snum)) {
400                 sk->sk_ipv6only = saved_ipv6only;
401                 inet_reset_saddr(sk);
402                 err = -EADDRINUSE;
403                 goto out;
404         }
405 
406         if (addr_type != IPV6_ADDR_ANY)
407                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
408         if (snum)
409                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
410         inet->inet_sport = htons(inet->inet_num);
411         inet->inet_dport = 0;
412         inet->inet_daddr = 0;
413 out:
414         release_sock(sk);
415         return err;
416 out_unlock:
417         rcu_read_unlock();
418         goto out;
419 }
420 EXPORT_SYMBOL(inet6_bind);
421 
422 int inet6_release(struct socket *sock)
423 {
424         struct sock *sk = sock->sk;
425 
426         if (!sk)
427                 return -EINVAL;
428 
429         /* Free mc lists */
430         ipv6_sock_mc_close(sk);
431 
432         /* Free ac lists */
433         ipv6_sock_ac_close(sk);
434 
435         return inet_release(sock);
436 }
437 EXPORT_SYMBOL(inet6_release);
438 
439 void inet6_destroy_sock(struct sock *sk)
440 {
441         struct ipv6_pinfo *np = inet6_sk(sk);
442         struct sk_buff *skb;
443         struct ipv6_txoptions *opt;
444 
445         /* Release rx options */
446 
447         skb = xchg(&np->pktoptions, NULL);
448         if (skb)
449                 kfree_skb(skb);
450 
451         skb = xchg(&np->rxpmtu, NULL);
452         if (skb)
453                 kfree_skb(skb);
454 
455         /* Free flowlabels */
456         fl6_free_socklist(sk);
457 
458         /* Free tx options */
459 
460         opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL);
461         if (opt) {
462                 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
463                 txopt_put(opt);
464         }
465 }
466 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
467 
468 /*
469  *      This does both peername and sockname.
470  */
471 
472 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
473                  int *uaddr_len, int peer)
474 {
475         struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
476         struct sock *sk = sock->sk;
477         struct inet_sock *inet = inet_sk(sk);
478         struct ipv6_pinfo *np = inet6_sk(sk);
479 
480         sin->sin6_family = AF_INET6;
481         sin->sin6_flowinfo = 0;
482         sin->sin6_scope_id = 0;
483         if (peer) {
484                 if (!inet->inet_dport)
485                         return -ENOTCONN;
486                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
487                     peer == 1)
488                         return -ENOTCONN;
489                 sin->sin6_port = inet->inet_dport;
490                 sin->sin6_addr = sk->sk_v6_daddr;
491                 if (np->sndflow)
492                         sin->sin6_flowinfo = np->flow_label;
493         } else {
494                 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
495                         sin->sin6_addr = np->saddr;
496                 else
497                         sin->sin6_addr = sk->sk_v6_rcv_saddr;
498 
499                 sin->sin6_port = inet->inet_sport;
500         }
501         sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
502                                                  sk->sk_bound_dev_if);
503         *uaddr_len = sizeof(*sin);
504         return 0;
505 }
506 EXPORT_SYMBOL(inet6_getname);
507 
508 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
509 {
510         struct sock *sk = sock->sk;
511         struct net *net = sock_net(sk);
512 
513         switch (cmd) {
514         case SIOCGSTAMP:
515                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
516 
517         case SIOCGSTAMPNS:
518                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
519 
520         case SIOCADDRT:
521         case SIOCDELRT:
522 
523                 return ipv6_route_ioctl(net, cmd, (void __user *)arg);
524 
525         case SIOCSIFADDR:
526                 return addrconf_add_ifaddr(net, (void __user *) arg);
527         case SIOCDIFADDR:
528                 return addrconf_del_ifaddr(net, (void __user *) arg);
529         case SIOCSIFDSTADDR:
530                 return addrconf_set_dstaddr(net, (void __user *) arg);
531         default:
532                 if (!sk->sk_prot->ioctl)
533                         return -ENOIOCTLCMD;
534                 return sk->sk_prot->ioctl(sk, cmd, arg);
535         }
536         /*NOTREACHED*/
537         return 0;
538 }
539 EXPORT_SYMBOL(inet6_ioctl);
540 
541 const struct proto_ops inet6_stream_ops = {
542         .family            = PF_INET6,
543         .owner             = THIS_MODULE,
544         .release           = inet6_release,
545         .bind              = inet6_bind,
546         .connect           = inet_stream_connect,       /* ok           */
547         .socketpair        = sock_no_socketpair,        /* a do nothing */
548         .accept            = inet_accept,               /* ok           */
549         .getname           = inet6_getname,
550         .poll              = tcp_poll,                  /* ok           */
551         .ioctl             = inet6_ioctl,               /* must change  */
552         .listen            = inet_listen,               /* ok           */
553         .shutdown          = inet_shutdown,             /* ok           */
554         .setsockopt        = sock_common_setsockopt,    /* ok           */
555         .getsockopt        = sock_common_getsockopt,    /* ok           */
556         .sendmsg           = inet_sendmsg,              /* ok           */
557         .recvmsg           = inet_recvmsg,              /* ok           */
558         .mmap              = sock_no_mmap,
559         .sendpage          = inet_sendpage,
560         .sendmsg_locked    = tcp_sendmsg_locked,
561         .sendpage_locked   = tcp_sendpage_locked,
562         .splice_read       = tcp_splice_read,
563         .read_sock         = tcp_read_sock,
564         .peek_len          = tcp_peek_len,
565 #ifdef CONFIG_COMPAT
566         .compat_setsockopt = compat_sock_common_setsockopt,
567         .compat_getsockopt = compat_sock_common_getsockopt,
568 #endif
569 };
570 
571 const struct proto_ops inet6_dgram_ops = {
572         .family            = PF_INET6,
573         .owner             = THIS_MODULE,
574         .release           = inet6_release,
575         .bind              = inet6_bind,
576         .connect           = inet_dgram_connect,        /* ok           */
577         .socketpair        = sock_no_socketpair,        /* a do nothing */
578         .accept            = sock_no_accept,            /* a do nothing */
579         .getname           = inet6_getname,
580         .poll              = udp_poll,                  /* ok           */
581         .ioctl             = inet6_ioctl,               /* must change  */
582         .listen            = sock_no_listen,            /* ok           */
583         .shutdown          = inet_shutdown,             /* ok           */
584         .setsockopt        = sock_common_setsockopt,    /* ok           */
585         .getsockopt        = sock_common_getsockopt,    /* ok           */
586         .sendmsg           = inet_sendmsg,              /* ok           */
587         .recvmsg           = inet_recvmsg,              /* ok           */
588         .mmap              = sock_no_mmap,
589         .sendpage          = sock_no_sendpage,
590         .set_peek_off      = sk_set_peek_off,
591 #ifdef CONFIG_COMPAT
592         .compat_setsockopt = compat_sock_common_setsockopt,
593         .compat_getsockopt = compat_sock_common_getsockopt,
594 #endif
595 };
596 
597 static const struct net_proto_family inet6_family_ops = {
598         .family = PF_INET6,
599         .create = inet6_create,
600         .owner  = THIS_MODULE,
601 };
602 
603 int inet6_register_protosw(struct inet_protosw *p)
604 {
605         struct list_head *lh;
606         struct inet_protosw *answer;
607         struct list_head *last_perm;
608         int protocol = p->protocol;
609         int ret;
610 
611         spin_lock_bh(&inetsw6_lock);
612 
613         ret = -EINVAL;
614         if (p->type >= SOCK_MAX)
615                 goto out_illegal;
616 
617         /* If we are trying to override a permanent protocol, bail. */
618         answer = NULL;
619         ret = -EPERM;
620         last_perm = &inetsw6[p->type];
621         list_for_each(lh, &inetsw6[p->type]) {
622                 answer = list_entry(lh, struct inet_protosw, list);
623 
624                 /* Check only the non-wild match. */
625                 if (INET_PROTOSW_PERMANENT & answer->flags) {
626                         if (protocol == answer->protocol)
627                                 break;
628                         last_perm = lh;
629                 }
630 
631                 answer = NULL;
632         }
633         if (answer)
634                 goto out_permanent;
635 
636         /* Add the new entry after the last permanent entry if any, so that
637          * the new entry does not override a permanent entry when matched with
638          * a wild-card protocol. But it is allowed to override any existing
639          * non-permanent entry.  This means that when we remove this entry, the
640          * system automatically returns to the old behavior.
641          */
642         list_add_rcu(&p->list, last_perm);
643         ret = 0;
644 out:
645         spin_unlock_bh(&inetsw6_lock);
646         return ret;
647 
648 out_permanent:
649         pr_err("Attempt to override permanent protocol %d\n", protocol);
650         goto out;
651 
652 out_illegal:
653         pr_err("Ignoring attempt to register invalid socket type %d\n",
654                p->type);
655         goto out;
656 }
657 EXPORT_SYMBOL(inet6_register_protosw);
658 
659 void
660 inet6_unregister_protosw(struct inet_protosw *p)
661 {
662         if (INET_PROTOSW_PERMANENT & p->flags) {
663                 pr_err("Attempt to unregister permanent protocol %d\n",
664                        p->protocol);
665         } else {
666                 spin_lock_bh(&inetsw6_lock);
667                 list_del_rcu(&p->list);
668                 spin_unlock_bh(&inetsw6_lock);
669 
670                 synchronize_net();
671         }
672 }
673 EXPORT_SYMBOL(inet6_unregister_protosw);
674 
675 int inet6_sk_rebuild_header(struct sock *sk)
676 {
677         struct ipv6_pinfo *np = inet6_sk(sk);
678         struct dst_entry *dst;
679 
680         dst = __sk_dst_check(sk, np->dst_cookie);
681 
682         if (!dst) {
683                 struct inet_sock *inet = inet_sk(sk);
684                 struct in6_addr *final_p, final;
685                 struct flowi6 fl6;
686 
687                 memset(&fl6, 0, sizeof(fl6));
688                 fl6.flowi6_proto = sk->sk_protocol;
689                 fl6.daddr = sk->sk_v6_daddr;
690                 fl6.saddr = np->saddr;
691                 fl6.flowlabel = np->flow_label;
692                 fl6.flowi6_oif = sk->sk_bound_dev_if;
693                 fl6.flowi6_mark = sk->sk_mark;
694                 fl6.fl6_dport = inet->inet_dport;
695                 fl6.fl6_sport = inet->inet_sport;
696                 fl6.flowi6_uid = sk->sk_uid;
697                 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
698 
699                 rcu_read_lock();
700                 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt),
701                                          &final);
702                 rcu_read_unlock();
703 
704                 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
705                 if (IS_ERR(dst)) {
706                         sk->sk_route_caps = 0;
707                         sk->sk_err_soft = -PTR_ERR(dst);
708                         return PTR_ERR(dst);
709                 }
710 
711                 ip6_dst_store(sk, dst, NULL, NULL);
712         }
713 
714         return 0;
715 }
716 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
717 
718 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
719                        const struct inet6_skb_parm *opt)
720 {
721         const struct ipv6_pinfo *np = inet6_sk(sk);
722 
723         if (np->rxopt.all) {
724                 if (((opt->flags & IP6SKB_HOPBYHOP) &&
725                      (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) ||
726                     (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) &&
727                      np->rxopt.bits.rxflow) ||
728                     (opt->srcrt && (np->rxopt.bits.srcrt ||
729                      np->rxopt.bits.osrcrt)) ||
730                     ((opt->dst1 || opt->dst0) &&
731                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
732                         return true;
733         }
734         return false;
735 }
736 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
737 
738 static struct packet_type ipv6_packet_type __read_mostly = {
739         .type = cpu_to_be16(ETH_P_IPV6),
740         .func = ipv6_rcv,
741 };
742 
743 static int __init ipv6_packet_init(void)
744 {
745         dev_add_pack(&ipv6_packet_type);
746         return 0;
747 }
748 
749 static void ipv6_packet_cleanup(void)
750 {
751         dev_remove_pack(&ipv6_packet_type);
752 }
753 
754 static int __net_init ipv6_init_mibs(struct net *net)
755 {
756         int i;
757 
758         net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib);
759         if (!net->mib.udp_stats_in6)
760                 return -ENOMEM;
761         net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib);
762         if (!net->mib.udplite_stats_in6)
763                 goto err_udplite_mib;
764         net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib);
765         if (!net->mib.ipv6_statistics)
766                 goto err_ip_mib;
767 
768         for_each_possible_cpu(i) {
769                 struct ipstats_mib *af_inet6_stats;
770                 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i);
771                 u64_stats_init(&af_inet6_stats->syncp);
772         }
773 
774 
775         net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib);
776         if (!net->mib.icmpv6_statistics)
777                 goto err_icmp_mib;
778         net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
779                                                 GFP_KERNEL);
780         if (!net->mib.icmpv6msg_statistics)
781                 goto err_icmpmsg_mib;
782         return 0;
783 
784 err_icmpmsg_mib:
785         free_percpu(net->mib.icmpv6_statistics);
786 err_icmp_mib:
787         free_percpu(net->mib.ipv6_statistics);
788 err_ip_mib:
789         free_percpu(net->mib.udplite_stats_in6);
790 err_udplite_mib:
791         free_percpu(net->mib.udp_stats_in6);
792         return -ENOMEM;
793 }
794 
795 static void ipv6_cleanup_mibs(struct net *net)
796 {
797         free_percpu(net->mib.udp_stats_in6);
798         free_percpu(net->mib.udplite_stats_in6);
799         free_percpu(net->mib.ipv6_statistics);
800         free_percpu(net->mib.icmpv6_statistics);
801         kfree(net->mib.icmpv6msg_statistics);
802 }
803 
804 static int __net_init inet6_net_init(struct net *net)
805 {
806         int err = 0;
807 
808         net->ipv6.sysctl.bindv6only = 0;
809         net->ipv6.sysctl.icmpv6_time = 1*HZ;
810         net->ipv6.sysctl.flowlabel_consistency = 1;
811         net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS;
812         net->ipv6.sysctl.idgen_retries = 3;
813         net->ipv6.sysctl.idgen_delay = 1 * HZ;
814         net->ipv6.sysctl.flowlabel_state_ranges = 0;
815         net->ipv6.sysctl.max_dst_opts_cnt = IP6_DEFAULT_MAX_DST_OPTS_CNT;
816         net->ipv6.sysctl.max_hbh_opts_cnt = IP6_DEFAULT_MAX_HBH_OPTS_CNT;
817         net->ipv6.sysctl.max_dst_opts_len = IP6_DEFAULT_MAX_DST_OPTS_LEN;
818         net->ipv6.sysctl.max_hbh_opts_len = IP6_DEFAULT_MAX_HBH_OPTS_LEN;
819         atomic_set(&net->ipv6.fib6_sernum, 1);
820 
821         err = ipv6_init_mibs(net);
822         if (err)
823                 return err;
824 #ifdef CONFIG_PROC_FS
825         err = udp6_proc_init(net);
826         if (err)
827                 goto out;
828         err = tcp6_proc_init(net);
829         if (err)
830                 goto proc_tcp6_fail;
831         err = ac6_proc_init(net);
832         if (err)
833                 goto proc_ac6_fail;
834 #endif
835         return err;
836 
837 #ifdef CONFIG_PROC_FS
838 proc_ac6_fail:
839         tcp6_proc_exit(net);
840 proc_tcp6_fail:
841         udp6_proc_exit(net);
842 out:
843         ipv6_cleanup_mibs(net);
844         return err;
845 #endif
846 }
847 
848 static void __net_exit inet6_net_exit(struct net *net)
849 {
850 #ifdef CONFIG_PROC_FS
851         udp6_proc_exit(net);
852         tcp6_proc_exit(net);
853         ac6_proc_exit(net);
854 #endif
855         ipv6_cleanup_mibs(net);
856 }
857 
858 static struct pernet_operations inet6_net_ops = {
859         .init = inet6_net_init,
860         .exit = inet6_net_exit,
861 };
862 
863 static const struct ipv6_stub ipv6_stub_impl = {
864         .ipv6_sock_mc_join = ipv6_sock_mc_join,
865         .ipv6_sock_mc_drop = ipv6_sock_mc_drop,
866         .ipv6_dst_lookup = ip6_dst_lookup,
867         .udpv6_encap_enable = udpv6_encap_enable,
868         .ndisc_send_na = ndisc_send_na,
869         .nd_tbl = &nd_tbl,
870 };
871 
872 static int __init inet6_init(void)
873 {
874         struct list_head *r;
875         int err = 0;
876 
877         sock_skb_cb_check_size(sizeof(struct inet6_skb_parm));
878 
879         /* Register the socket-side information for inet6_create.  */
880         for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
881                 INIT_LIST_HEAD(r);
882 
883         if (disable_ipv6_mod) {
884                 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
885                 goto out;
886         }
887 
888         err = proto_register(&tcpv6_prot, 1);
889         if (err)
890                 goto out;
891 
892         err = proto_register(&udpv6_prot, 1);
893         if (err)
894                 goto out_unregister_tcp_proto;
895 
896         err = proto_register(&udplitev6_prot, 1);
897         if (err)
898                 goto out_unregister_udp_proto;
899 
900         err = proto_register(&rawv6_prot, 1);
901         if (err)
902                 goto out_unregister_udplite_proto;
903 
904         err = proto_register(&pingv6_prot, 1);
905         if (err)
906                 goto out_unregister_ping_proto;
907 
908         /* We MUST register RAW sockets before we create the ICMP6,
909          * IGMP6, or NDISC control sockets.
910          */
911         err = rawv6_init();
912         if (err)
913                 goto out_unregister_raw_proto;
914 
915         /* Register the family here so that the init calls below will
916          * be able to create sockets. (?? is this dangerous ??)
917          */
918         err = sock_register(&inet6_family_ops);
919         if (err)
920                 goto out_sock_register_fail;
921 
922         /*
923          *      ipngwg API draft makes clear that the correct semantics
924          *      for TCP and UDP is to consider one TCP and UDP instance
925          *      in a host available by both INET and INET6 APIs and
926          *      able to communicate via both network protocols.
927          */
928 
929         err = register_pernet_subsys(&inet6_net_ops);
930         if (err)
931                 goto register_pernet_fail;
932         err = ip6_mr_init();
933         if (err)
934                 goto ipmr_fail;
935         err = icmpv6_init();
936         if (err)
937                 goto icmp_fail;
938         err = ndisc_init();
939         if (err)
940                 goto ndisc_fail;
941         err = igmp6_init();
942         if (err)
943                 goto igmp_fail;
944 
945         err = ipv6_netfilter_init();
946         if (err)
947                 goto netfilter_fail;
948         /* Create /proc/foo6 entries. */
949 #ifdef CONFIG_PROC_FS
950         err = -ENOMEM;
951         if (raw6_proc_init())
952                 goto proc_raw6_fail;
953         if (udplite6_proc_init())
954                 goto proc_udplite6_fail;
955         if (ipv6_misc_proc_init())
956                 goto proc_misc6_fail;
957         if (if6_proc_init())
958                 goto proc_if6_fail;
959 #endif
960         err = ip6_route_init();
961         if (err)
962                 goto ip6_route_fail;
963         err = ndisc_late_init();
964         if (err)
965                 goto ndisc_late_fail;
966         err = ip6_flowlabel_init();
967         if (err)
968                 goto ip6_flowlabel_fail;
969         err = addrconf_init();
970         if (err)
971                 goto addrconf_fail;
972 
973         /* Init v6 extension headers. */
974         err = ipv6_exthdrs_init();
975         if (err)
976                 goto ipv6_exthdrs_fail;
977 
978         err = ipv6_frag_init();
979         if (err)
980                 goto ipv6_frag_fail;
981 
982         /* Init v6 transport protocols. */
983         err = udpv6_init();
984         if (err)
985                 goto udpv6_fail;
986 
987         err = udplitev6_init();
988         if (err)
989                 goto udplitev6_fail;
990 
991         err = udpv6_offload_init();
992         if (err)
993                 goto udpv6_offload_fail;
994 
995         err = tcpv6_init();
996         if (err)
997                 goto tcpv6_fail;
998 
999         err = ipv6_packet_init();
1000         if (err)
1001                 goto ipv6_packet_fail;
1002 
1003         err = pingv6_init();
1004         if (err)
1005                 goto pingv6_fail;
1006 
1007         err = calipso_init();
1008         if (err)
1009                 goto calipso_fail;
1010 
1011         err = seg6_init();
1012         if (err)
1013                 goto seg6_fail;
1014 
1015         err = igmp6_late_init();
1016         if (err)
1017                 goto igmp6_late_err;
1018 
1019 #ifdef CONFIG_SYSCTL
1020         err = ipv6_sysctl_register();
1021         if (err)
1022                 goto sysctl_fail;
1023 #endif
1024 
1025         /* ensure that ipv6 stubs are visible only after ipv6 is ready */
1026         wmb();
1027         ipv6_stub = &ipv6_stub_impl;
1028 out:
1029         return err;
1030 
1031 #ifdef CONFIG_SYSCTL
1032 sysctl_fail:
1033         igmp6_late_cleanup();
1034 #endif
1035 igmp6_late_err:
1036         seg6_exit();
1037 seg6_fail:
1038         calipso_exit();
1039 calipso_fail:
1040         pingv6_exit();
1041 pingv6_fail:
1042         ipv6_packet_cleanup();
1043 ipv6_packet_fail:
1044         tcpv6_exit();
1045 tcpv6_fail:
1046         udpv6_offload_exit();
1047 udpv6_offload_fail:
1048         udplitev6_exit();
1049 udplitev6_fail:
1050         udpv6_exit();
1051 udpv6_fail:
1052         ipv6_frag_exit();
1053 ipv6_frag_fail:
1054         ipv6_exthdrs_exit();
1055 ipv6_exthdrs_fail:
1056         addrconf_cleanup();
1057 addrconf_fail:
1058         ip6_flowlabel_cleanup();
1059 ip6_flowlabel_fail:
1060         ndisc_late_cleanup();
1061 ndisc_late_fail:
1062         ip6_route_cleanup();
1063 ip6_route_fail:
1064 #ifdef CONFIG_PROC_FS
1065         if6_proc_exit();
1066 proc_if6_fail:
1067         ipv6_misc_proc_exit();
1068 proc_misc6_fail:
1069         udplite6_proc_exit();
1070 proc_udplite6_fail:
1071         raw6_proc_exit();
1072 proc_raw6_fail:
1073 #endif
1074         ipv6_netfilter_fini();
1075 netfilter_fail:
1076         igmp6_cleanup();
1077 igmp_fail:
1078         ndisc_cleanup();
1079 ndisc_fail:
1080         ip6_mr_cleanup();
1081 icmp_fail:
1082         unregister_pernet_subsys(&inet6_net_ops);
1083 ipmr_fail:
1084         icmpv6_cleanup();
1085 register_pernet_fail:
1086         sock_unregister(PF_INET6);
1087         rtnl_unregister_all(PF_INET6);
1088 out_sock_register_fail:
1089         rawv6_exit();
1090 out_unregister_ping_proto:
1091         proto_unregister(&pingv6_prot);
1092 out_unregister_raw_proto:
1093         proto_unregister(&rawv6_prot);
1094 out_unregister_udplite_proto:
1095         proto_unregister(&udplitev6_prot);
1096 out_unregister_udp_proto:
1097         proto_unregister(&udpv6_prot);
1098 out_unregister_tcp_proto:
1099         proto_unregister(&tcpv6_prot);
1100         goto out;
1101 }
1102 module_init(inet6_init);
1103 
1104 MODULE_ALIAS_NETPROTO(PF_INET6);
1105 

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