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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->mc_all      = 1;
213         np->pmtudisc    = IPV6_PMTUDISC_WANT;
214         np->repflow     = net->ipv6.sysctl.flowlabel_reflect;
215         sk->sk_ipv6only = net->ipv6.sysctl.bindv6only;
216 
217         /* Init the ipv4 part of the socket since we can have sockets
218          * using v6 API for ipv4.
219          */
220         inet->uc_ttl    = -1;
221 
222         inet->mc_loop   = 1;
223         inet->mc_ttl    = 1;
224         inet->mc_index  = 0;
225         inet->mc_list   = NULL;
226         inet->rcv_tos   = 0;
227 
228         if (net->ipv4.sysctl_ip_no_pmtu_disc)
229                 inet->pmtudisc = IP_PMTUDISC_DONT;
230         else
231                 inet->pmtudisc = IP_PMTUDISC_WANT;
232         /*
233          * Increment only the relevant sk_prot->socks debug field, this changes
234          * the previous behaviour of incrementing both the equivalent to
235          * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
236          *
237          * This allows better debug granularity as we'll know exactly how many
238          * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
239          * transport protocol socks. -acme
240          */
241         sk_refcnt_debug_inc(sk);
242 
243         if (inet->inet_num) {
244                 /* It assumes that any protocol which allows
245                  * the user to assign a number at socket
246                  * creation time automatically shares.
247                  */
248                 inet->inet_sport = htons(inet->inet_num);
249                 err = sk->sk_prot->hash(sk);
250                 if (err) {
251                         sk_common_release(sk);
252                         goto out;
253                 }
254         }
255         if (sk->sk_prot->init) {
256                 err = sk->sk_prot->init(sk);
257                 if (err) {
258                         sk_common_release(sk);
259                         goto out;
260                 }
261         }
262 
263         if (!kern) {
264                 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
265                 if (err) {
266                         sk_common_release(sk);
267                         goto out;
268                 }
269         }
270 out:
271         return err;
272 out_rcu_unlock:
273         rcu_read_unlock();
274         goto out;
275 }
276 
277 static int __inet6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
278                         bool force_bind_address_no_port, bool with_lock)
279 {
280         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
281         struct inet_sock *inet = inet_sk(sk);
282         struct ipv6_pinfo *np = inet6_sk(sk);
283         struct net *net = sock_net(sk);
284         __be32 v4addr = 0;
285         unsigned short snum;
286         bool saved_ipv6only;
287         int addr_type = 0;
288         int err = 0;
289 
290         if (addr->sin6_family != AF_INET6)
291                 return -EAFNOSUPPORT;
292 
293         addr_type = ipv6_addr_type(&addr->sin6_addr);
294         if ((addr_type & IPV6_ADDR_MULTICAST) && sk->sk_type == SOCK_STREAM)
295                 return -EINVAL;
296 
297         snum = ntohs(addr->sin6_port);
298         if (snum && snum < inet_prot_sock(net) &&
299             !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
300                 return -EACCES;
301 
302         if (with_lock)
303                 lock_sock(sk);
304 
305         /* Check these errors (active socket, double bind). */
306         if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
307                 err = -EINVAL;
308                 goto out;
309         }
310 
311         /* Check if the address belongs to the host. */
312         if (addr_type == IPV6_ADDR_MAPPED) {
313                 struct net_device *dev = NULL;
314                 int chk_addr_ret;
315 
316                 /* Binding to v4-mapped address on a v6-only socket
317                  * makes no sense
318                  */
319                 if (sk->sk_ipv6only) {
320                         err = -EINVAL;
321                         goto out;
322                 }
323 
324                 rcu_read_lock();
325                 if (sk->sk_bound_dev_if) {
326                         dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
327                         if (!dev) {
328                                 err = -ENODEV;
329                                 goto out_unlock;
330                         }
331                 }
332 
333                 /* Reproduce AF_INET checks to make the bindings consistent */
334                 v4addr = addr->sin6_addr.s6_addr32[3];
335                 chk_addr_ret = inet_addr_type_dev_table(net, dev, v4addr);
336                 rcu_read_unlock();
337 
338                 if (!inet_can_nonlocal_bind(net, inet) &&
339                     v4addr != htonl(INADDR_ANY) &&
340                     chk_addr_ret != RTN_LOCAL &&
341                     chk_addr_ret != RTN_MULTICAST &&
342                     chk_addr_ret != RTN_BROADCAST) {
343                         err = -EADDRNOTAVAIL;
344                         goto out;
345                 }
346         } else {
347                 if (addr_type != IPV6_ADDR_ANY) {
348                         struct net_device *dev = NULL;
349 
350                         rcu_read_lock();
351                         if (__ipv6_addr_needs_scope_id(addr_type)) {
352                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
353                                     addr->sin6_scope_id) {
354                                         /* Override any existing binding, if another one
355                                          * is supplied by user.
356                                          */
357                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
358                                 }
359 
360                                 /* Binding to link-local address requires an interface */
361                                 if (!sk->sk_bound_dev_if) {
362                                         err = -EINVAL;
363                                         goto out_unlock;
364                                 }
365                         }
366 
367                         if (sk->sk_bound_dev_if) {
368                                 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
369                                 if (!dev) {
370                                         err = -ENODEV;
371                                         goto out_unlock;
372                                 }
373                         }
374 
375                         /* ipv4 addr of the socket is invalid.  Only the
376                          * unspecified and mapped address have a v4 equivalent.
377                          */
378                         v4addr = LOOPBACK4_IPV6;
379                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
380                                 if (!ipv6_can_nonlocal_bind(net, inet) &&
381                                     !ipv6_chk_addr(net, &addr->sin6_addr,
382                                                    dev, 0)) {
383                                         err = -EADDRNOTAVAIL;
384                                         goto out_unlock;
385                                 }
386                         }
387                         rcu_read_unlock();
388                 }
389         }
390 
391         inet->inet_rcv_saddr = v4addr;
392         inet->inet_saddr = v4addr;
393 
394         sk->sk_v6_rcv_saddr = addr->sin6_addr;
395 
396         if (!(addr_type & IPV6_ADDR_MULTICAST))
397                 np->saddr = addr->sin6_addr;
398 
399         saved_ipv6only = sk->sk_ipv6only;
400         if (addr_type != IPV6_ADDR_ANY && addr_type != IPV6_ADDR_MAPPED)
401                 sk->sk_ipv6only = 1;
402 
403         /* Make sure we are allowed to bind here. */
404         if (snum || !(inet->bind_address_no_port ||
405                       force_bind_address_no_port)) {
406                 if (sk->sk_prot->get_port(sk, snum)) {
407                         sk->sk_ipv6only = saved_ipv6only;
408                         inet_reset_saddr(sk);
409                         err = -EADDRINUSE;
410                         goto out;
411                 }
412                 err = BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk);
413                 if (err) {
414                         sk->sk_ipv6only = saved_ipv6only;
415                         inet_reset_saddr(sk);
416                         goto out;
417                 }
418         }
419 
420         if (addr_type != IPV6_ADDR_ANY)
421                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
422         if (snum)
423                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
424         inet->inet_sport = htons(inet->inet_num);
425         inet->inet_dport = 0;
426         inet->inet_daddr = 0;
427 out:
428         if (with_lock)
429                 release_sock(sk);
430         return err;
431 out_unlock:
432         rcu_read_unlock();
433         goto out;
434 }
435 
436 /* bind for INET6 API */
437 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
438 {
439         struct sock *sk = sock->sk;
440         int err = 0;
441 
442         /* If the socket has its own bind function then use it. */
443         if (sk->sk_prot->bind)
444                 return sk->sk_prot->bind(sk, uaddr, addr_len);
445 
446         if (addr_len < SIN6_LEN_RFC2133)
447                 return -EINVAL;
448 
449         /* BPF prog is run before any checks are done so that if the prog
450          * changes context in a wrong way it will be caught.
451          */
452         err = BPF_CGROUP_RUN_PROG_INET6_BIND(sk, uaddr);
453         if (err)
454                 return err;
455 
456         return __inet6_bind(sk, uaddr, addr_len, false, true);
457 }
458 EXPORT_SYMBOL(inet6_bind);
459 
460 int inet6_release(struct socket *sock)
461 {
462         struct sock *sk = sock->sk;
463 
464         if (!sk)
465                 return -EINVAL;
466 
467         /* Free mc lists */
468         ipv6_sock_mc_close(sk);
469 
470         /* Free ac lists */
471         ipv6_sock_ac_close(sk);
472 
473         return inet_release(sock);
474 }
475 EXPORT_SYMBOL(inet6_release);
476 
477 void inet6_destroy_sock(struct sock *sk)
478 {
479         struct ipv6_pinfo *np = inet6_sk(sk);
480         struct sk_buff *skb;
481         struct ipv6_txoptions *opt;
482 
483         /* Release rx options */
484 
485         skb = xchg(&np->pktoptions, NULL);
486         kfree_skb(skb);
487 
488         skb = xchg(&np->rxpmtu, NULL);
489         kfree_skb(skb);
490 
491         /* Free flowlabels */
492         fl6_free_socklist(sk);
493 
494         /* Free tx options */
495 
496         opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL);
497         if (opt) {
498                 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
499                 txopt_put(opt);
500         }
501 }
502 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
503 
504 /*
505  *      This does both peername and sockname.
506  */
507 
508 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
509                  int peer)
510 {
511         struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
512         struct sock *sk = sock->sk;
513         struct inet_sock *inet = inet_sk(sk);
514         struct ipv6_pinfo *np = inet6_sk(sk);
515 
516         sin->sin6_family = AF_INET6;
517         sin->sin6_flowinfo = 0;
518         sin->sin6_scope_id = 0;
519         if (peer) {
520                 if (!inet->inet_dport)
521                         return -ENOTCONN;
522                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
523                     peer == 1)
524                         return -ENOTCONN;
525                 sin->sin6_port = inet->inet_dport;
526                 sin->sin6_addr = sk->sk_v6_daddr;
527                 if (np->sndflow)
528                         sin->sin6_flowinfo = np->flow_label;
529         } else {
530                 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
531                         sin->sin6_addr = np->saddr;
532                 else
533                         sin->sin6_addr = sk->sk_v6_rcv_saddr;
534 
535                 sin->sin6_port = inet->inet_sport;
536         }
537         sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
538                                                  sk->sk_bound_dev_if);
539         return sizeof(*sin);
540 }
541 EXPORT_SYMBOL(inet6_getname);
542 
543 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
544 {
545         struct sock *sk = sock->sk;
546         struct net *net = sock_net(sk);
547 
548         switch (cmd) {
549         case SIOCGSTAMP:
550                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
551 
552         case SIOCGSTAMPNS:
553                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
554 
555         case SIOCADDRT:
556         case SIOCDELRT:
557 
558                 return ipv6_route_ioctl(net, cmd, (void __user *)arg);
559 
560         case SIOCSIFADDR:
561                 return addrconf_add_ifaddr(net, (void __user *) arg);
562         case SIOCDIFADDR:
563                 return addrconf_del_ifaddr(net, (void __user *) arg);
564         case SIOCSIFDSTADDR:
565                 return addrconf_set_dstaddr(net, (void __user *) arg);
566         default:
567                 if (!sk->sk_prot->ioctl)
568                         return -ENOIOCTLCMD;
569                 return sk->sk_prot->ioctl(sk, cmd, arg);
570         }
571         /*NOTREACHED*/
572         return 0;
573 }
574 EXPORT_SYMBOL(inet6_ioctl);
575 
576 const struct proto_ops inet6_stream_ops = {
577         .family            = PF_INET6,
578         .owner             = THIS_MODULE,
579         .release           = inet6_release,
580         .bind              = inet6_bind,
581         .connect           = inet_stream_connect,       /* ok           */
582         .socketpair        = sock_no_socketpair,        /* a do nothing */
583         .accept            = inet_accept,               /* ok           */
584         .getname           = inet6_getname,
585         .poll              = tcp_poll,                  /* ok           */
586         .ioctl             = inet6_ioctl,               /* must change  */
587         .listen            = inet_listen,               /* ok           */
588         .shutdown          = inet_shutdown,             /* ok           */
589         .setsockopt        = sock_common_setsockopt,    /* ok           */
590         .getsockopt        = sock_common_getsockopt,    /* ok           */
591         .sendmsg           = inet_sendmsg,              /* ok           */
592         .recvmsg           = inet_recvmsg,              /* ok           */
593 #ifdef CONFIG_MMU
594         .mmap              = tcp_mmap,
595 #endif
596         .sendpage          = inet_sendpage,
597         .sendmsg_locked    = tcp_sendmsg_locked,
598         .sendpage_locked   = tcp_sendpage_locked,
599         .splice_read       = tcp_splice_read,
600         .read_sock         = tcp_read_sock,
601         .peek_len          = tcp_peek_len,
602 #ifdef CONFIG_COMPAT
603         .compat_setsockopt = compat_sock_common_setsockopt,
604         .compat_getsockopt = compat_sock_common_getsockopt,
605 #endif
606         .set_rcvlowat      = tcp_set_rcvlowat,
607 };
608 
609 const struct proto_ops inet6_dgram_ops = {
610         .family            = PF_INET6,
611         .owner             = THIS_MODULE,
612         .release           = inet6_release,
613         .bind              = inet6_bind,
614         .connect           = inet_dgram_connect,        /* ok           */
615         .socketpair        = sock_no_socketpair,        /* a do nothing */
616         .accept            = sock_no_accept,            /* a do nothing */
617         .getname           = inet6_getname,
618         .poll              = udp_poll,                  /* ok           */
619         .ioctl             = inet6_ioctl,               /* must change  */
620         .listen            = sock_no_listen,            /* ok           */
621         .shutdown          = inet_shutdown,             /* ok           */
622         .setsockopt        = sock_common_setsockopt,    /* ok           */
623         .getsockopt        = sock_common_getsockopt,    /* ok           */
624         .sendmsg           = inet_sendmsg,              /* ok           */
625         .recvmsg           = inet_recvmsg,              /* ok           */
626         .mmap              = sock_no_mmap,
627         .sendpage          = sock_no_sendpage,
628         .set_peek_off      = sk_set_peek_off,
629 #ifdef CONFIG_COMPAT
630         .compat_setsockopt = compat_sock_common_setsockopt,
631         .compat_getsockopt = compat_sock_common_getsockopt,
632 #endif
633 };
634 
635 static const struct net_proto_family inet6_family_ops = {
636         .family = PF_INET6,
637         .create = inet6_create,
638         .owner  = THIS_MODULE,
639 };
640 
641 int inet6_register_protosw(struct inet_protosw *p)
642 {
643         struct list_head *lh;
644         struct inet_protosw *answer;
645         struct list_head *last_perm;
646         int protocol = p->protocol;
647         int ret;
648 
649         spin_lock_bh(&inetsw6_lock);
650 
651         ret = -EINVAL;
652         if (p->type >= SOCK_MAX)
653                 goto out_illegal;
654 
655         /* If we are trying to override a permanent protocol, bail. */
656         answer = NULL;
657         ret = -EPERM;
658         last_perm = &inetsw6[p->type];
659         list_for_each(lh, &inetsw6[p->type]) {
660                 answer = list_entry(lh, struct inet_protosw, list);
661 
662                 /* Check only the non-wild match. */
663                 if (INET_PROTOSW_PERMANENT & answer->flags) {
664                         if (protocol == answer->protocol)
665                                 break;
666                         last_perm = lh;
667                 }
668 
669                 answer = NULL;
670         }
671         if (answer)
672                 goto out_permanent;
673 
674         /* Add the new entry after the last permanent entry if any, so that
675          * the new entry does not override a permanent entry when matched with
676          * a wild-card protocol. But it is allowed to override any existing
677          * non-permanent entry.  This means that when we remove this entry, the
678          * system automatically returns to the old behavior.
679          */
680         list_add_rcu(&p->list, last_perm);
681         ret = 0;
682 out:
683         spin_unlock_bh(&inetsw6_lock);
684         return ret;
685 
686 out_permanent:
687         pr_err("Attempt to override permanent protocol %d\n", protocol);
688         goto out;
689 
690 out_illegal:
691         pr_err("Ignoring attempt to register invalid socket type %d\n",
692                p->type);
693         goto out;
694 }
695 EXPORT_SYMBOL(inet6_register_protosw);
696 
697 void
698 inet6_unregister_protosw(struct inet_protosw *p)
699 {
700         if (INET_PROTOSW_PERMANENT & p->flags) {
701                 pr_err("Attempt to unregister permanent protocol %d\n",
702                        p->protocol);
703         } else {
704                 spin_lock_bh(&inetsw6_lock);
705                 list_del_rcu(&p->list);
706                 spin_unlock_bh(&inetsw6_lock);
707 
708                 synchronize_net();
709         }
710 }
711 EXPORT_SYMBOL(inet6_unregister_protosw);
712 
713 int inet6_sk_rebuild_header(struct sock *sk)
714 {
715         struct ipv6_pinfo *np = inet6_sk(sk);
716         struct dst_entry *dst;
717 
718         dst = __sk_dst_check(sk, np->dst_cookie);
719 
720         if (!dst) {
721                 struct inet_sock *inet = inet_sk(sk);
722                 struct in6_addr *final_p, final;
723                 struct flowi6 fl6;
724 
725                 memset(&fl6, 0, sizeof(fl6));
726                 fl6.flowi6_proto = sk->sk_protocol;
727                 fl6.daddr = sk->sk_v6_daddr;
728                 fl6.saddr = np->saddr;
729                 fl6.flowlabel = np->flow_label;
730                 fl6.flowi6_oif = sk->sk_bound_dev_if;
731                 fl6.flowi6_mark = sk->sk_mark;
732                 fl6.fl6_dport = inet->inet_dport;
733                 fl6.fl6_sport = inet->inet_sport;
734                 fl6.flowi6_uid = sk->sk_uid;
735                 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
736 
737                 rcu_read_lock();
738                 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt),
739                                          &final);
740                 rcu_read_unlock();
741 
742                 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
743                 if (IS_ERR(dst)) {
744                         sk->sk_route_caps = 0;
745                         sk->sk_err_soft = -PTR_ERR(dst);
746                         return PTR_ERR(dst);
747                 }
748 
749                 ip6_dst_store(sk, dst, NULL, NULL);
750         }
751 
752         return 0;
753 }
754 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
755 
756 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
757                        const struct inet6_skb_parm *opt)
758 {
759         const struct ipv6_pinfo *np = inet6_sk(sk);
760 
761         if (np->rxopt.all) {
762                 if (((opt->flags & IP6SKB_HOPBYHOP) &&
763                      (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) ||
764                     (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) &&
765                      np->rxopt.bits.rxflow) ||
766                     (opt->srcrt && (np->rxopt.bits.srcrt ||
767                      np->rxopt.bits.osrcrt)) ||
768                     ((opt->dst1 || opt->dst0) &&
769                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
770                         return true;
771         }
772         return false;
773 }
774 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
775 
776 static struct packet_type ipv6_packet_type __read_mostly = {
777         .type = cpu_to_be16(ETH_P_IPV6),
778         .func = ipv6_rcv,
779         .list_func = ipv6_list_rcv,
780 };
781 
782 static int __init ipv6_packet_init(void)
783 {
784         dev_add_pack(&ipv6_packet_type);
785         return 0;
786 }
787 
788 static void ipv6_packet_cleanup(void)
789 {
790         dev_remove_pack(&ipv6_packet_type);
791 }
792 
793 static int __net_init ipv6_init_mibs(struct net *net)
794 {
795         int i;
796 
797         net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib);
798         if (!net->mib.udp_stats_in6)
799                 return -ENOMEM;
800         net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib);
801         if (!net->mib.udplite_stats_in6)
802                 goto err_udplite_mib;
803         net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib);
804         if (!net->mib.ipv6_statistics)
805                 goto err_ip_mib;
806 
807         for_each_possible_cpu(i) {
808                 struct ipstats_mib *af_inet6_stats;
809                 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i);
810                 u64_stats_init(&af_inet6_stats->syncp);
811         }
812 
813 
814         net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib);
815         if (!net->mib.icmpv6_statistics)
816                 goto err_icmp_mib;
817         net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
818                                                 GFP_KERNEL);
819         if (!net->mib.icmpv6msg_statistics)
820                 goto err_icmpmsg_mib;
821         return 0;
822 
823 err_icmpmsg_mib:
824         free_percpu(net->mib.icmpv6_statistics);
825 err_icmp_mib:
826         free_percpu(net->mib.ipv6_statistics);
827 err_ip_mib:
828         free_percpu(net->mib.udplite_stats_in6);
829 err_udplite_mib:
830         free_percpu(net->mib.udp_stats_in6);
831         return -ENOMEM;
832 }
833 
834 static void ipv6_cleanup_mibs(struct net *net)
835 {
836         free_percpu(net->mib.udp_stats_in6);
837         free_percpu(net->mib.udplite_stats_in6);
838         free_percpu(net->mib.ipv6_statistics);
839         free_percpu(net->mib.icmpv6_statistics);
840         kfree(net->mib.icmpv6msg_statistics);
841 }
842 
843 static int __net_init inet6_net_init(struct net *net)
844 {
845         int err = 0;
846 
847         net->ipv6.sysctl.bindv6only = 0;
848         net->ipv6.sysctl.icmpv6_time = 1*HZ;
849         net->ipv6.sysctl.icmpv6_echo_ignore_all = 0;
850         net->ipv6.sysctl.flowlabel_consistency = 1;
851         net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS;
852         net->ipv6.sysctl.idgen_retries = 3;
853         net->ipv6.sysctl.idgen_delay = 1 * HZ;
854         net->ipv6.sysctl.flowlabel_state_ranges = 0;
855         net->ipv6.sysctl.max_dst_opts_cnt = IP6_DEFAULT_MAX_DST_OPTS_CNT;
856         net->ipv6.sysctl.max_hbh_opts_cnt = IP6_DEFAULT_MAX_HBH_OPTS_CNT;
857         net->ipv6.sysctl.max_dst_opts_len = IP6_DEFAULT_MAX_DST_OPTS_LEN;
858         net->ipv6.sysctl.max_hbh_opts_len = IP6_DEFAULT_MAX_HBH_OPTS_LEN;
859         atomic_set(&net->ipv6.fib6_sernum, 1);
860 
861         err = ipv6_init_mibs(net);
862         if (err)
863                 return err;
864 #ifdef CONFIG_PROC_FS
865         err = udp6_proc_init(net);
866         if (err)
867                 goto out;
868         err = tcp6_proc_init(net);
869         if (err)
870                 goto proc_tcp6_fail;
871         err = ac6_proc_init(net);
872         if (err)
873                 goto proc_ac6_fail;
874 #endif
875         return err;
876 
877 #ifdef CONFIG_PROC_FS
878 proc_ac6_fail:
879         tcp6_proc_exit(net);
880 proc_tcp6_fail:
881         udp6_proc_exit(net);
882 out:
883         ipv6_cleanup_mibs(net);
884         return err;
885 #endif
886 }
887 
888 static void __net_exit inet6_net_exit(struct net *net)
889 {
890 #ifdef CONFIG_PROC_FS
891         udp6_proc_exit(net);
892         tcp6_proc_exit(net);
893         ac6_proc_exit(net);
894 #endif
895         ipv6_cleanup_mibs(net);
896 }
897 
898 static struct pernet_operations inet6_net_ops = {
899         .init = inet6_net_init,
900         .exit = inet6_net_exit,
901 };
902 
903 static const struct ipv6_stub ipv6_stub_impl = {
904         .ipv6_sock_mc_join = ipv6_sock_mc_join,
905         .ipv6_sock_mc_drop = ipv6_sock_mc_drop,
906         .ipv6_dst_lookup   = ip6_dst_lookup,
907         .fib6_get_table    = fib6_get_table,
908         .fib6_table_lookup = fib6_table_lookup,
909         .fib6_lookup       = fib6_lookup,
910         .fib6_multipath_select = fib6_multipath_select,
911         .ip6_mtu_from_fib6 = ip6_mtu_from_fib6,
912         .udpv6_encap_enable = udpv6_encap_enable,
913         .ndisc_send_na = ndisc_send_na,
914         .nd_tbl = &nd_tbl,
915 };
916 
917 static const struct ipv6_bpf_stub ipv6_bpf_stub_impl = {
918         .inet6_bind = __inet6_bind,
919         .udp6_lib_lookup = __udp6_lib_lookup,
920 };
921 
922 static int __init inet6_init(void)
923 {
924         struct list_head *r;
925         int err = 0;
926 
927         sock_skb_cb_check_size(sizeof(struct inet6_skb_parm));
928 
929         /* Register the socket-side information for inet6_create.  */
930         for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
931                 INIT_LIST_HEAD(r);
932 
933         if (disable_ipv6_mod) {
934                 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
935                 goto out;
936         }
937 
938         err = proto_register(&tcpv6_prot, 1);
939         if (err)
940                 goto out;
941 
942         err = proto_register(&udpv6_prot, 1);
943         if (err)
944                 goto out_unregister_tcp_proto;
945 
946         err = proto_register(&udplitev6_prot, 1);
947         if (err)
948                 goto out_unregister_udp_proto;
949 
950         err = proto_register(&rawv6_prot, 1);
951         if (err)
952                 goto out_unregister_udplite_proto;
953 
954         err = proto_register(&pingv6_prot, 1);
955         if (err)
956                 goto out_unregister_raw_proto;
957 
958         /* We MUST register RAW sockets before we create the ICMP6,
959          * IGMP6, or NDISC control sockets.
960          */
961         err = rawv6_init();
962         if (err)
963                 goto out_unregister_ping_proto;
964 
965         /* Register the family here so that the init calls below will
966          * be able to create sockets. (?? is this dangerous ??)
967          */
968         err = sock_register(&inet6_family_ops);
969         if (err)
970                 goto out_sock_register_fail;
971 
972         /*
973          *      ipngwg API draft makes clear that the correct semantics
974          *      for TCP and UDP is to consider one TCP and UDP instance
975          *      in a host available by both INET and INET6 APIs and
976          *      able to communicate via both network protocols.
977          */
978 
979         err = register_pernet_subsys(&inet6_net_ops);
980         if (err)
981                 goto register_pernet_fail;
982         err = ip6_mr_init();
983         if (err)
984                 goto ipmr_fail;
985         err = icmpv6_init();
986         if (err)
987                 goto icmp_fail;
988         err = ndisc_init();
989         if (err)
990                 goto ndisc_fail;
991         err = igmp6_init();
992         if (err)
993                 goto igmp_fail;
994 
995         err = ipv6_netfilter_init();
996         if (err)
997                 goto netfilter_fail;
998         /* Create /proc/foo6 entries. */
999 #ifdef CONFIG_PROC_FS
1000         err = -ENOMEM;
1001         if (raw6_proc_init())
1002                 goto proc_raw6_fail;
1003         if (udplite6_proc_init())
1004                 goto proc_udplite6_fail;
1005         if (ipv6_misc_proc_init())
1006                 goto proc_misc6_fail;
1007         if (if6_proc_init())
1008                 goto proc_if6_fail;
1009 #endif
1010         err = ip6_route_init();
1011         if (err)
1012                 goto ip6_route_fail;
1013         err = ndisc_late_init();
1014         if (err)
1015                 goto ndisc_late_fail;
1016         err = ip6_flowlabel_init();
1017         if (err)
1018                 goto ip6_flowlabel_fail;
1019         err = ipv6_anycast_init();
1020         if (err)
1021                 goto ipv6_anycast_fail;
1022         err = addrconf_init();
1023         if (err)
1024                 goto addrconf_fail;
1025 
1026         /* Init v6 extension headers. */
1027         err = ipv6_exthdrs_init();
1028         if (err)
1029                 goto ipv6_exthdrs_fail;
1030 
1031         err = ipv6_frag_init();
1032         if (err)
1033                 goto ipv6_frag_fail;
1034 
1035         /* Init v6 transport protocols. */
1036         err = udpv6_init();
1037         if (err)
1038                 goto udpv6_fail;
1039 
1040         err = udplitev6_init();
1041         if (err)
1042                 goto udplitev6_fail;
1043 
1044         err = udpv6_offload_init();
1045         if (err)
1046                 goto udpv6_offload_fail;
1047 
1048         err = tcpv6_init();
1049         if (err)
1050                 goto tcpv6_fail;
1051 
1052         err = ipv6_packet_init();
1053         if (err)
1054                 goto ipv6_packet_fail;
1055 
1056         err = pingv6_init();
1057         if (err)
1058                 goto pingv6_fail;
1059 
1060         err = calipso_init();
1061         if (err)
1062                 goto calipso_fail;
1063 
1064         err = seg6_init();
1065         if (err)
1066                 goto seg6_fail;
1067 
1068         err = igmp6_late_init();
1069         if (err)
1070                 goto igmp6_late_err;
1071 
1072 #ifdef CONFIG_SYSCTL
1073         err = ipv6_sysctl_register();
1074         if (err)
1075                 goto sysctl_fail;
1076 #endif
1077 
1078         /* ensure that ipv6 stubs are visible only after ipv6 is ready */
1079         wmb();
1080         ipv6_stub = &ipv6_stub_impl;
1081         ipv6_bpf_stub = &ipv6_bpf_stub_impl;
1082 out:
1083         return err;
1084 
1085 #ifdef CONFIG_SYSCTL
1086 sysctl_fail:
1087         igmp6_late_cleanup();
1088 #endif
1089 igmp6_late_err:
1090         seg6_exit();
1091 seg6_fail:
1092         calipso_exit();
1093 calipso_fail:
1094         pingv6_exit();
1095 pingv6_fail:
1096         ipv6_packet_cleanup();
1097 ipv6_packet_fail:
1098         tcpv6_exit();
1099 tcpv6_fail:
1100         udpv6_offload_exit();
1101 udpv6_offload_fail:
1102         udplitev6_exit();
1103 udplitev6_fail:
1104         udpv6_exit();
1105 udpv6_fail:
1106         ipv6_frag_exit();
1107 ipv6_frag_fail:
1108         ipv6_exthdrs_exit();
1109 ipv6_exthdrs_fail:
1110         addrconf_cleanup();
1111 addrconf_fail:
1112         ipv6_anycast_cleanup();
1113 ipv6_anycast_fail:
1114         ip6_flowlabel_cleanup();
1115 ip6_flowlabel_fail:
1116         ndisc_late_cleanup();
1117 ndisc_late_fail:
1118         ip6_route_cleanup();
1119 ip6_route_fail:
1120 #ifdef CONFIG_PROC_FS
1121         if6_proc_exit();
1122 proc_if6_fail:
1123         ipv6_misc_proc_exit();
1124 proc_misc6_fail:
1125         udplite6_proc_exit();
1126 proc_udplite6_fail:
1127         raw6_proc_exit();
1128 proc_raw6_fail:
1129 #endif
1130         ipv6_netfilter_fini();
1131 netfilter_fail:
1132         igmp6_cleanup();
1133 igmp_fail:
1134         ndisc_cleanup();
1135 ndisc_fail:
1136         icmpv6_cleanup();
1137 icmp_fail:
1138         ip6_mr_cleanup();
1139 ipmr_fail:
1140         unregister_pernet_subsys(&inet6_net_ops);
1141 register_pernet_fail:
1142         sock_unregister(PF_INET6);
1143         rtnl_unregister_all(PF_INET6);
1144 out_sock_register_fail:
1145         rawv6_exit();
1146 out_unregister_ping_proto:
1147         proto_unregister(&pingv6_prot);
1148 out_unregister_raw_proto:
1149         proto_unregister(&rawv6_prot);
1150 out_unregister_udplite_proto:
1151         proto_unregister(&udplitev6_prot);
1152 out_unregister_udp_proto:
1153         proto_unregister(&udpv6_prot);
1154 out_unregister_tcp_proto:
1155         proto_unregister(&tcpv6_prot);
1156         goto out;
1157 }
1158 module_init(inet6_init);
1159 
1160 MODULE_ALIAS_NETPROTO(PF_INET6);
1161 

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