~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/net/ipv6/af_inet6.c

Version: ~ [ linux-5.11-rc3 ] ~ [ linux-5.10.7 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.89 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.167 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.215 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.251 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.251 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.85 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*
  3  *      PF_INET6 socket protocol family
  4  *      Linux INET6 implementation
  5  *
  6  *      Authors:
  7  *      Pedro Roque             <roque@di.fc.ul.pt>
  8  *
  9  *      Adapted from linux/net/ipv4/af_inet.c
 10  *
 11  *      Fixes:
 12  *      piggy, Karl Knutson     :       Socket protocol table
 13  *      Hideaki YOSHIFUJI       :       sin6_scope_id support
 14  *      Arnaldo Melo            :       check proc_net_create return, cleanups
 15  */
 16 
 17 #define pr_fmt(fmt) "IPv6: " fmt
 18 
 19 #include <linux/module.h>
 20 #include <linux/capability.h>
 21 #include <linux/errno.h>
 22 #include <linux/types.h>
 23 #include <linux/socket.h>
 24 #include <linux/in.h>
 25 #include <linux/kernel.h>
 26 #include <linux/timer.h>
 27 #include <linux/string.h>
 28 #include <linux/sockios.h>
 29 #include <linux/net.h>
 30 #include <linux/fcntl.h>
 31 #include <linux/mm.h>
 32 #include <linux/interrupt.h>
 33 #include <linux/proc_fs.h>
 34 #include <linux/stat.h>
 35 #include <linux/init.h>
 36 #include <linux/slab.h>
 37 
 38 #include <linux/inet.h>
 39 #include <linux/netdevice.h>
 40 #include <linux/icmpv6.h>
 41 #include <linux/netfilter_ipv6.h>
 42 
 43 #include <net/ip.h>
 44 #include <net/ipv6.h>
 45 #include <net/udp.h>
 46 #include <net/udplite.h>
 47 #include <net/tcp.h>
 48 #include <net/ping.h>
 49 #include <net/protocol.h>
 50 #include <net/inet_common.h>
 51 #include <net/route.h>
 52 #include <net/transp_v6.h>
 53 #include <net/ip6_route.h>
 54 #include <net/addrconf.h>
 55 #include <net/ipv6_stubs.h>
 56 #include <net/ndisc.h>
 57 #ifdef CONFIG_IPV6_TUNNEL
 58 #include <net/ip6_tunnel.h>
 59 #endif
 60 #include <net/calipso.h>
 61 #include <net/seg6.h>
 62 
 63 #include <linux/uaccess.h>
 64 #include <linux/mroute6.h>
 65 
 66 #include "ip6_offload.h"
 67 
 68 MODULE_AUTHOR("Cast of dozens");
 69 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
 70 MODULE_LICENSE("GPL");
 71 
 72 /* The inetsw6 table contains everything that inet6_create needs to
 73  * build a new socket.
 74  */
 75 static struct list_head inetsw6[SOCK_MAX];
 76 static DEFINE_SPINLOCK(inetsw6_lock);
 77 
 78 struct ipv6_params ipv6_defaults = {
 79         .disable_ipv6 = 0,
 80         .autoconf = 1,
 81 };
 82 
 83 static int disable_ipv6_mod;
 84 
 85 module_param_named(disable, disable_ipv6_mod, int, 0444);
 86 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
 87 
 88 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
 89 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
 90 
 91 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
 92 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
 93 
 94 bool ipv6_mod_enabled(void)
 95 {
 96         return disable_ipv6_mod == 0;
 97 }
 98 EXPORT_SYMBOL_GPL(ipv6_mod_enabled);
 99 
100 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
101 {
102         const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
103 
104         return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
105 }
106 
107 static int inet6_create(struct net *net, struct socket *sock, int protocol,
108                         int kern)
109 {
110         struct inet_sock *inet;
111         struct ipv6_pinfo *np;
112         struct sock *sk;
113         struct inet_protosw *answer;
114         struct proto *answer_prot;
115         unsigned char answer_flags;
116         int try_loading_module = 0;
117         int err;
118 
119         if (protocol < 0 || protocol >= IPPROTO_MAX)
120                 return -EINVAL;
121 
122         /* Look for the requested type/protocol pair. */
123 lookup_protocol:
124         err = -ESOCKTNOSUPPORT;
125         rcu_read_lock();
126         list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
127 
128                 err = 0;
129                 /* Check the non-wild match. */
130                 if (protocol == answer->protocol) {
131                         if (protocol != IPPROTO_IP)
132                                 break;
133                 } else {
134                         /* Check for the two wild cases. */
135                         if (IPPROTO_IP == protocol) {
136                                 protocol = answer->protocol;
137                                 break;
138                         }
139                         if (IPPROTO_IP == answer->protocol)
140                                 break;
141                 }
142                 err = -EPROTONOSUPPORT;
143         }
144 
145         if (err) {
146                 if (try_loading_module < 2) {
147                         rcu_read_unlock();
148                         /*
149                          * Be more specific, e.g. net-pf-10-proto-132-type-1
150                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
151                          */
152                         if (++try_loading_module == 1)
153                                 request_module("net-pf-%d-proto-%d-type-%d",
154                                                 PF_INET6, protocol, sock->type);
155                         /*
156                          * Fall back to generic, e.g. net-pf-10-proto-132
157                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
158                          */
159                         else
160                                 request_module("net-pf-%d-proto-%d",
161                                                 PF_INET6, protocol);
162                         goto lookup_protocol;
163                 } else
164                         goto out_rcu_unlock;
165         }
166 
167         err = -EPERM;
168         if (sock->type == SOCK_RAW && !kern &&
169             !ns_capable(net->user_ns, CAP_NET_RAW))
170                 goto out_rcu_unlock;
171 
172         sock->ops = answer->ops;
173         answer_prot = answer->prot;
174         answer_flags = answer->flags;
175         rcu_read_unlock();
176 
177         WARN_ON(!answer_prot->slab);
178 
179         err = -ENOBUFS;
180         sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern);
181         if (!sk)
182                 goto out;
183 
184         sock_init_data(sock, sk);
185 
186         err = 0;
187         if (INET_PROTOSW_REUSE & answer_flags)
188                 sk->sk_reuse = SK_CAN_REUSE;
189 
190         inet = inet_sk(sk);
191         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
192 
193         if (SOCK_RAW == sock->type) {
194                 inet->inet_num = protocol;
195                 if (IPPROTO_RAW == protocol)
196                         inet->hdrincl = 1;
197         }
198 
199         sk->sk_destruct         = inet_sock_destruct;
200         sk->sk_family           = PF_INET6;
201         sk->sk_protocol         = protocol;
202 
203         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
204 
205         inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
206         np->hop_limit   = -1;
207         np->mcast_hops  = IPV6_DEFAULT_MCASTHOPS;
208         np->mc_loop     = 1;
209         np->mc_all      = 1;
210         np->pmtudisc    = IPV6_PMTUDISC_WANT;
211         np->repflow     = net->ipv6.sysctl.flowlabel_reflect & FLOWLABEL_REFLECT_ESTABLISHED;
212         sk->sk_ipv6only = net->ipv6.sysctl.bindv6only;
213 
214         /* Init the ipv4 part of the socket since we can have sockets
215          * using v6 API for ipv4.
216          */
217         inet->uc_ttl    = -1;
218 
219         inet->mc_loop   = 1;
220         inet->mc_ttl    = 1;
221         inet->mc_index  = 0;
222         inet->mc_list   = NULL;
223         inet->rcv_tos   = 0;
224 
225         if (net->ipv4.sysctl_ip_no_pmtu_disc)
226                 inet->pmtudisc = IP_PMTUDISC_DONT;
227         else
228                 inet->pmtudisc = IP_PMTUDISC_WANT;
229         /*
230          * Increment only the relevant sk_prot->socks debug field, this changes
231          * the previous behaviour of incrementing both the equivalent to
232          * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
233          *
234          * This allows better debug granularity as we'll know exactly how many
235          * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
236          * transport protocol socks. -acme
237          */
238         sk_refcnt_debug_inc(sk);
239 
240         if (inet->inet_num) {
241                 /* It assumes that any protocol which allows
242                  * the user to assign a number at socket
243                  * creation time automatically shares.
244                  */
245                 inet->inet_sport = htons(inet->inet_num);
246                 err = sk->sk_prot->hash(sk);
247                 if (err) {
248                         sk_common_release(sk);
249                         goto out;
250                 }
251         }
252         if (sk->sk_prot->init) {
253                 err = sk->sk_prot->init(sk);
254                 if (err) {
255                         sk_common_release(sk);
256                         goto out;
257                 }
258         }
259 
260         if (!kern) {
261                 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
262                 if (err) {
263                         sk_common_release(sk);
264                         goto out;
265                 }
266         }
267 out:
268         return err;
269 out_rcu_unlock:
270         rcu_read_unlock();
271         goto out;
272 }
273 
274 static int __inet6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
275                         bool force_bind_address_no_port, bool with_lock)
276 {
277         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
278         struct inet_sock *inet = inet_sk(sk);
279         struct ipv6_pinfo *np = inet6_sk(sk);
280         struct net *net = sock_net(sk);
281         __be32 v4addr = 0;
282         unsigned short snum;
283         bool saved_ipv6only;
284         int addr_type = 0;
285         int err = 0;
286 
287         if (addr->sin6_family != AF_INET6)
288                 return -EAFNOSUPPORT;
289 
290         addr_type = ipv6_addr_type(&addr->sin6_addr);
291         if ((addr_type & IPV6_ADDR_MULTICAST) && sk->sk_type == SOCK_STREAM)
292                 return -EINVAL;
293 
294         snum = ntohs(addr->sin6_port);
295         if (snum && snum < inet_prot_sock(net) &&
296             !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
297                 return -EACCES;
298 
299         if (with_lock)
300                 lock_sock(sk);
301 
302         /* Check these errors (active socket, double bind). */
303         if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
304                 err = -EINVAL;
305                 goto out;
306         }
307 
308         /* Check if the address belongs to the host. */
309         if (addr_type == IPV6_ADDR_MAPPED) {
310                 struct net_device *dev = NULL;
311                 int chk_addr_ret;
312 
313                 /* Binding to v4-mapped address on a v6-only socket
314                  * makes no sense
315                  */
316                 if (sk->sk_ipv6only) {
317                         err = -EINVAL;
318                         goto out;
319                 }
320 
321                 rcu_read_lock();
322                 if (sk->sk_bound_dev_if) {
323                         dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
324                         if (!dev) {
325                                 err = -ENODEV;
326                                 goto out_unlock;
327                         }
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_dev_table(net, dev, v4addr);
333                 rcu_read_unlock();
334 
335                 if (!inet_can_nonlocal_bind(net, inet) &&
336                     v4addr != htonl(INADDR_ANY) &&
337                     chk_addr_ret != RTN_LOCAL &&
338                     chk_addr_ret != RTN_MULTICAST &&
339                     chk_addr_ret != RTN_BROADCAST) {
340                         err = -EADDRNOTAVAIL;
341                         goto out;
342                 }
343         } else {
344                 if (addr_type != IPV6_ADDR_ANY) {
345                         struct net_device *dev = NULL;
346 
347                         rcu_read_lock();
348                         if (__ipv6_addr_needs_scope_id(addr_type)) {
349                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
350                                     addr->sin6_scope_id) {
351                                         /* Override any existing binding, if another one
352                                          * is supplied by user.
353                                          */
354                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
355                                 }
356 
357                                 /* Binding to link-local address requires an interface */
358                                 if (!sk->sk_bound_dev_if) {
359                                         err = -EINVAL;
360                                         goto out_unlock;
361                                 }
362                         }
363 
364                         if (sk->sk_bound_dev_if) {
365                                 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
366                                 if (!dev) {
367                                         err = -ENODEV;
368                                         goto out_unlock;
369                                 }
370                         }
371 
372                         /* ipv4 addr of the socket is invalid.  Only the
373                          * unspecified and mapped address have a v4 equivalent.
374                          */
375                         v4addr = LOOPBACK4_IPV6;
376                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
377                                 if (!ipv6_can_nonlocal_bind(net, inet) &&
378                                     !ipv6_chk_addr(net, &addr->sin6_addr,
379                                                    dev, 0)) {
380                                         err = -EADDRNOTAVAIL;
381                                         goto out_unlock;
382                                 }
383                         }
384                         rcu_read_unlock();
385                 }
386         }
387 
388         inet->inet_rcv_saddr = v4addr;
389         inet->inet_saddr = v4addr;
390 
391         sk->sk_v6_rcv_saddr = addr->sin6_addr;
392 
393         if (!(addr_type & IPV6_ADDR_MULTICAST))
394                 np->saddr = addr->sin6_addr;
395 
396         saved_ipv6only = sk->sk_ipv6only;
397         if (addr_type != IPV6_ADDR_ANY && addr_type != IPV6_ADDR_MAPPED)
398                 sk->sk_ipv6only = 1;
399 
400         /* Make sure we are allowed to bind here. */
401         if (snum || !(inet->bind_address_no_port ||
402                       force_bind_address_no_port)) {
403                 if (sk->sk_prot->get_port(sk, snum)) {
404                         sk->sk_ipv6only = saved_ipv6only;
405                         inet_reset_saddr(sk);
406                         err = -EADDRINUSE;
407                         goto out;
408                 }
409                 err = BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk);
410                 if (err) {
411                         sk->sk_ipv6only = saved_ipv6only;
412                         inet_reset_saddr(sk);
413                         goto out;
414                 }
415         }
416 
417         if (addr_type != IPV6_ADDR_ANY)
418                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
419         if (snum)
420                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
421         inet->inet_sport = htons(inet->inet_num);
422         inet->inet_dport = 0;
423         inet->inet_daddr = 0;
424 out:
425         if (with_lock)
426                 release_sock(sk);
427         return err;
428 out_unlock:
429         rcu_read_unlock();
430         goto out;
431 }
432 
433 /* bind for INET6 API */
434 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
435 {
436         struct sock *sk = sock->sk;
437         int err = 0;
438 
439         /* If the socket has its own bind function then use it. */
440         if (sk->sk_prot->bind)
441                 return sk->sk_prot->bind(sk, uaddr, addr_len);
442 
443         if (addr_len < SIN6_LEN_RFC2133)
444                 return -EINVAL;
445 
446         /* BPF prog is run before any checks are done so that if the prog
447          * changes context in a wrong way it will be caught.
448          */
449         err = BPF_CGROUP_RUN_PROG_INET6_BIND(sk, uaddr);
450         if (err)
451                 return err;
452 
453         return __inet6_bind(sk, uaddr, addr_len, false, true);
454 }
455 EXPORT_SYMBOL(inet6_bind);
456 
457 int inet6_release(struct socket *sock)
458 {
459         struct sock *sk = sock->sk;
460 
461         if (!sk)
462                 return -EINVAL;
463 
464         /* Free mc lists */
465         ipv6_sock_mc_close(sk);
466 
467         /* Free ac lists */
468         ipv6_sock_ac_close(sk);
469 
470         return inet_release(sock);
471 }
472 EXPORT_SYMBOL(inet6_release);
473 
474 void inet6_destroy_sock(struct sock *sk)
475 {
476         struct ipv6_pinfo *np = inet6_sk(sk);
477         struct sk_buff *skb;
478         struct ipv6_txoptions *opt;
479 
480         /* Release rx options */
481 
482         skb = xchg(&np->pktoptions, NULL);
483         kfree_skb(skb);
484 
485         skb = xchg(&np->rxpmtu, NULL);
486         kfree_skb(skb);
487 
488         /* Free flowlabels */
489         fl6_free_socklist(sk);
490 
491         /* Free tx options */
492 
493         opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL);
494         if (opt) {
495                 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
496                 txopt_put(opt);
497         }
498 }
499 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
500 
501 /*
502  *      This does both peername and sockname.
503  */
504 
505 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
506                  int peer)
507 {
508         struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
509         struct sock *sk = sock->sk;
510         struct inet_sock *inet = inet_sk(sk);
511         struct ipv6_pinfo *np = inet6_sk(sk);
512 
513         sin->sin6_family = AF_INET6;
514         sin->sin6_flowinfo = 0;
515         sin->sin6_scope_id = 0;
516         if (peer) {
517                 if (!inet->inet_dport)
518                         return -ENOTCONN;
519                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
520                     peer == 1)
521                         return -ENOTCONN;
522                 sin->sin6_port = inet->inet_dport;
523                 sin->sin6_addr = sk->sk_v6_daddr;
524                 if (np->sndflow)
525                         sin->sin6_flowinfo = np->flow_label;
526         } else {
527                 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
528                         sin->sin6_addr = np->saddr;
529                 else
530                         sin->sin6_addr = sk->sk_v6_rcv_saddr;
531 
532                 sin->sin6_port = inet->inet_sport;
533         }
534         sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
535                                                  sk->sk_bound_dev_if);
536         return sizeof(*sin);
537 }
538 EXPORT_SYMBOL(inet6_getname);
539 
540 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
541 {
542         struct sock *sk = sock->sk;
543         struct net *net = sock_net(sk);
544 
545         switch (cmd) {
546         case SIOCADDRT:
547         case SIOCDELRT:
548 
549                 return ipv6_route_ioctl(net, cmd, (void __user *)arg);
550 
551         case SIOCSIFADDR:
552                 return addrconf_add_ifaddr(net, (void __user *) arg);
553         case SIOCDIFADDR:
554                 return addrconf_del_ifaddr(net, (void __user *) arg);
555         case SIOCSIFDSTADDR:
556                 return addrconf_set_dstaddr(net, (void __user *) arg);
557         default:
558                 if (!sk->sk_prot->ioctl)
559                         return -ENOIOCTLCMD;
560                 return sk->sk_prot->ioctl(sk, cmd, arg);
561         }
562         /*NOTREACHED*/
563         return 0;
564 }
565 EXPORT_SYMBOL(inet6_ioctl);
566 
567 INDIRECT_CALLABLE_DECLARE(int udpv6_sendmsg(struct sock *, struct msghdr *,
568                                             size_t));
569 int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
570 {
571         struct sock *sk = sock->sk;
572 
573         if (unlikely(inet_send_prepare(sk)))
574                 return -EAGAIN;
575 
576         return INDIRECT_CALL_2(sk->sk_prot->sendmsg, tcp_sendmsg, udpv6_sendmsg,
577                                sk, msg, size);
578 }
579 
580 INDIRECT_CALLABLE_DECLARE(int udpv6_recvmsg(struct sock *, struct msghdr *,
581                                             size_t, int, int, int *));
582 int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
583                   int flags)
584 {
585         struct sock *sk = sock->sk;
586         int addr_len = 0;
587         int err;
588 
589         if (likely(!(flags & MSG_ERRQUEUE)))
590                 sock_rps_record_flow(sk);
591 
592         err = INDIRECT_CALL_2(sk->sk_prot->recvmsg, tcp_recvmsg, udpv6_recvmsg,
593                               sk, msg, size, flags & MSG_DONTWAIT,
594                               flags & ~MSG_DONTWAIT, &addr_len);
595         if (err >= 0)
596                 msg->msg_namelen = addr_len;
597         return err;
598 }
599 
600 const struct proto_ops inet6_stream_ops = {
601         .family            = PF_INET6,
602         .owner             = THIS_MODULE,
603         .release           = inet6_release,
604         .bind              = inet6_bind,
605         .connect           = inet_stream_connect,       /* ok           */
606         .socketpair        = sock_no_socketpair,        /* a do nothing */
607         .accept            = inet_accept,               /* ok           */
608         .getname           = inet6_getname,
609         .poll              = tcp_poll,                  /* ok           */
610         .ioctl             = inet6_ioctl,               /* must change  */
611         .gettstamp         = sock_gettstamp,
612         .listen            = inet_listen,               /* ok           */
613         .shutdown          = inet_shutdown,             /* ok           */
614         .setsockopt        = sock_common_setsockopt,    /* ok           */
615         .getsockopt        = sock_common_getsockopt,    /* ok           */
616         .sendmsg           = inet6_sendmsg,             /* retpoline's sake */
617         .recvmsg           = inet6_recvmsg,             /* retpoline's sake */
618 #ifdef CONFIG_MMU
619         .mmap              = tcp_mmap,
620 #endif
621         .sendpage          = inet_sendpage,
622         .sendmsg_locked    = tcp_sendmsg_locked,
623         .sendpage_locked   = tcp_sendpage_locked,
624         .splice_read       = tcp_splice_read,
625         .read_sock         = tcp_read_sock,
626         .peek_len          = tcp_peek_len,
627 #ifdef CONFIG_COMPAT
628         .compat_setsockopt = compat_sock_common_setsockopt,
629         .compat_getsockopt = compat_sock_common_getsockopt,
630 #endif
631         .set_rcvlowat      = tcp_set_rcvlowat,
632 };
633 
634 const struct proto_ops inet6_dgram_ops = {
635         .family            = PF_INET6,
636         .owner             = THIS_MODULE,
637         .release           = inet6_release,
638         .bind              = inet6_bind,
639         .connect           = inet_dgram_connect,        /* ok           */
640         .socketpair        = sock_no_socketpair,        /* a do nothing */
641         .accept            = sock_no_accept,            /* a do nothing */
642         .getname           = inet6_getname,
643         .poll              = udp_poll,                  /* ok           */
644         .ioctl             = inet6_ioctl,               /* must change  */
645         .gettstamp         = sock_gettstamp,
646         .listen            = sock_no_listen,            /* ok           */
647         .shutdown          = inet_shutdown,             /* ok           */
648         .setsockopt        = sock_common_setsockopt,    /* ok           */
649         .getsockopt        = sock_common_getsockopt,    /* ok           */
650         .sendmsg           = inet6_sendmsg,             /* retpoline's sake */
651         .recvmsg           = inet6_recvmsg,             /* retpoline's sake */
652         .mmap              = sock_no_mmap,
653         .sendpage          = sock_no_sendpage,
654         .set_peek_off      = sk_set_peek_off,
655 #ifdef CONFIG_COMPAT
656         .compat_setsockopt = compat_sock_common_setsockopt,
657         .compat_getsockopt = compat_sock_common_getsockopt,
658 #endif
659 };
660 
661 static const struct net_proto_family inet6_family_ops = {
662         .family = PF_INET6,
663         .create = inet6_create,
664         .owner  = THIS_MODULE,
665 };
666 
667 int inet6_register_protosw(struct inet_protosw *p)
668 {
669         struct list_head *lh;
670         struct inet_protosw *answer;
671         struct list_head *last_perm;
672         int protocol = p->protocol;
673         int ret;
674 
675         spin_lock_bh(&inetsw6_lock);
676 
677         ret = -EINVAL;
678         if (p->type >= SOCK_MAX)
679                 goto out_illegal;
680 
681         /* If we are trying to override a permanent protocol, bail. */
682         answer = NULL;
683         ret = -EPERM;
684         last_perm = &inetsw6[p->type];
685         list_for_each(lh, &inetsw6[p->type]) {
686                 answer = list_entry(lh, struct inet_protosw, list);
687 
688                 /* Check only the non-wild match. */
689                 if (INET_PROTOSW_PERMANENT & answer->flags) {
690                         if (protocol == answer->protocol)
691                                 break;
692                         last_perm = lh;
693                 }
694 
695                 answer = NULL;
696         }
697         if (answer)
698                 goto out_permanent;
699 
700         /* Add the new entry after the last permanent entry if any, so that
701          * the new entry does not override a permanent entry when matched with
702          * a wild-card protocol. But it is allowed to override any existing
703          * non-permanent entry.  This means that when we remove this entry, the
704          * system automatically returns to the old behavior.
705          */
706         list_add_rcu(&p->list, last_perm);
707         ret = 0;
708 out:
709         spin_unlock_bh(&inetsw6_lock);
710         return ret;
711 
712 out_permanent:
713         pr_err("Attempt to override permanent protocol %d\n", protocol);
714         goto out;
715 
716 out_illegal:
717         pr_err("Ignoring attempt to register invalid socket type %d\n",
718                p->type);
719         goto out;
720 }
721 EXPORT_SYMBOL(inet6_register_protosw);
722 
723 void
724 inet6_unregister_protosw(struct inet_protosw *p)
725 {
726         if (INET_PROTOSW_PERMANENT & p->flags) {
727                 pr_err("Attempt to unregister permanent protocol %d\n",
728                        p->protocol);
729         } else {
730                 spin_lock_bh(&inetsw6_lock);
731                 list_del_rcu(&p->list);
732                 spin_unlock_bh(&inetsw6_lock);
733 
734                 synchronize_net();
735         }
736 }
737 EXPORT_SYMBOL(inet6_unregister_protosw);
738 
739 int inet6_sk_rebuild_header(struct sock *sk)
740 {
741         struct ipv6_pinfo *np = inet6_sk(sk);
742         struct dst_entry *dst;
743 
744         dst = __sk_dst_check(sk, np->dst_cookie);
745 
746         if (!dst) {
747                 struct inet_sock *inet = inet_sk(sk);
748                 struct in6_addr *final_p, final;
749                 struct flowi6 fl6;
750 
751                 memset(&fl6, 0, sizeof(fl6));
752                 fl6.flowi6_proto = sk->sk_protocol;
753                 fl6.daddr = sk->sk_v6_daddr;
754                 fl6.saddr = np->saddr;
755                 fl6.flowlabel = np->flow_label;
756                 fl6.flowi6_oif = sk->sk_bound_dev_if;
757                 fl6.flowi6_mark = sk->sk_mark;
758                 fl6.fl6_dport = inet->inet_dport;
759                 fl6.fl6_sport = inet->inet_sport;
760                 fl6.flowi6_uid = sk->sk_uid;
761                 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
762 
763                 rcu_read_lock();
764                 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt),
765                                          &final);
766                 rcu_read_unlock();
767 
768                 dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
769                 if (IS_ERR(dst)) {
770                         sk->sk_route_caps = 0;
771                         sk->sk_err_soft = -PTR_ERR(dst);
772                         return PTR_ERR(dst);
773                 }
774 
775                 ip6_dst_store(sk, dst, NULL, NULL);
776         }
777 
778         return 0;
779 }
780 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
781 
782 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
783                        const struct inet6_skb_parm *opt)
784 {
785         const struct ipv6_pinfo *np = inet6_sk(sk);
786 
787         if (np->rxopt.all) {
788                 if (((opt->flags & IP6SKB_HOPBYHOP) &&
789                      (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) ||
790                     (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) &&
791                      np->rxopt.bits.rxflow) ||
792                     (opt->srcrt && (np->rxopt.bits.srcrt ||
793                      np->rxopt.bits.osrcrt)) ||
794                     ((opt->dst1 || opt->dst0) &&
795                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
796                         return true;
797         }
798         return false;
799 }
800 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
801 
802 static struct packet_type ipv6_packet_type __read_mostly = {
803         .type = cpu_to_be16(ETH_P_IPV6),
804         .func = ipv6_rcv,
805         .list_func = ipv6_list_rcv,
806 };
807 
808 static int __init ipv6_packet_init(void)
809 {
810         dev_add_pack(&ipv6_packet_type);
811         return 0;
812 }
813 
814 static void ipv6_packet_cleanup(void)
815 {
816         dev_remove_pack(&ipv6_packet_type);
817 }
818 
819 static int __net_init ipv6_init_mibs(struct net *net)
820 {
821         int i;
822 
823         net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib);
824         if (!net->mib.udp_stats_in6)
825                 return -ENOMEM;
826         net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib);
827         if (!net->mib.udplite_stats_in6)
828                 goto err_udplite_mib;
829         net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib);
830         if (!net->mib.ipv6_statistics)
831                 goto err_ip_mib;
832 
833         for_each_possible_cpu(i) {
834                 struct ipstats_mib *af_inet6_stats;
835                 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i);
836                 u64_stats_init(&af_inet6_stats->syncp);
837         }
838 
839 
840         net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib);
841         if (!net->mib.icmpv6_statistics)
842                 goto err_icmp_mib;
843         net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
844                                                 GFP_KERNEL);
845         if (!net->mib.icmpv6msg_statistics)
846                 goto err_icmpmsg_mib;
847         return 0;
848 
849 err_icmpmsg_mib:
850         free_percpu(net->mib.icmpv6_statistics);
851 err_icmp_mib:
852         free_percpu(net->mib.ipv6_statistics);
853 err_ip_mib:
854         free_percpu(net->mib.udplite_stats_in6);
855 err_udplite_mib:
856         free_percpu(net->mib.udp_stats_in6);
857         return -ENOMEM;
858 }
859 
860 static void ipv6_cleanup_mibs(struct net *net)
861 {
862         free_percpu(net->mib.udp_stats_in6);
863         free_percpu(net->mib.udplite_stats_in6);
864         free_percpu(net->mib.ipv6_statistics);
865         free_percpu(net->mib.icmpv6_statistics);
866         kfree(net->mib.icmpv6msg_statistics);
867 }
868 
869 static int __net_init inet6_net_init(struct net *net)
870 {
871         int err = 0;
872 
873         net->ipv6.sysctl.bindv6only = 0;
874         net->ipv6.sysctl.icmpv6_time = 1*HZ;
875         net->ipv6.sysctl.icmpv6_echo_ignore_all = 0;
876         net->ipv6.sysctl.icmpv6_echo_ignore_multicast = 0;
877         net->ipv6.sysctl.icmpv6_echo_ignore_anycast = 0;
878 
879         /* By default, rate limit error messages.
880          * Except for pmtu discovery, it would break it.
881          * proc_do_large_bitmap needs pointer to the bitmap.
882          */
883         bitmap_set(net->ipv6.sysctl.icmpv6_ratemask, 0, ICMPV6_ERRMSG_MAX + 1);
884         bitmap_clear(net->ipv6.sysctl.icmpv6_ratemask, ICMPV6_PKT_TOOBIG, 1);
885         net->ipv6.sysctl.icmpv6_ratemask_ptr = net->ipv6.sysctl.icmpv6_ratemask;
886 
887         net->ipv6.sysctl.flowlabel_consistency = 1;
888         net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS;
889         net->ipv6.sysctl.idgen_retries = 3;
890         net->ipv6.sysctl.idgen_delay = 1 * HZ;
891         net->ipv6.sysctl.flowlabel_state_ranges = 0;
892         net->ipv6.sysctl.max_dst_opts_cnt = IP6_DEFAULT_MAX_DST_OPTS_CNT;
893         net->ipv6.sysctl.max_hbh_opts_cnt = IP6_DEFAULT_MAX_HBH_OPTS_CNT;
894         net->ipv6.sysctl.max_dst_opts_len = IP6_DEFAULT_MAX_DST_OPTS_LEN;
895         net->ipv6.sysctl.max_hbh_opts_len = IP6_DEFAULT_MAX_HBH_OPTS_LEN;
896         atomic_set(&net->ipv6.fib6_sernum, 1);
897 
898         err = ipv6_init_mibs(net);
899         if (err)
900                 return err;
901 #ifdef CONFIG_PROC_FS
902         err = udp6_proc_init(net);
903         if (err)
904                 goto out;
905         err = tcp6_proc_init(net);
906         if (err)
907                 goto proc_tcp6_fail;
908         err = ac6_proc_init(net);
909         if (err)
910                 goto proc_ac6_fail;
911 #endif
912         return err;
913 
914 #ifdef CONFIG_PROC_FS
915 proc_ac6_fail:
916         tcp6_proc_exit(net);
917 proc_tcp6_fail:
918         udp6_proc_exit(net);
919 out:
920         ipv6_cleanup_mibs(net);
921         return err;
922 #endif
923 }
924 
925 static void __net_exit inet6_net_exit(struct net *net)
926 {
927 #ifdef CONFIG_PROC_FS
928         udp6_proc_exit(net);
929         tcp6_proc_exit(net);
930         ac6_proc_exit(net);
931 #endif
932         ipv6_cleanup_mibs(net);
933 }
934 
935 static struct pernet_operations inet6_net_ops = {
936         .init = inet6_net_init,
937         .exit = inet6_net_exit,
938 };
939 
940 static int ipv6_route_input(struct sk_buff *skb)
941 {
942         ip6_route_input(skb);
943         return skb_dst(skb)->error;
944 }
945 
946 static const struct ipv6_stub ipv6_stub_impl = {
947         .ipv6_sock_mc_join = ipv6_sock_mc_join,
948         .ipv6_sock_mc_drop = ipv6_sock_mc_drop,
949         .ipv6_dst_lookup_flow = ip6_dst_lookup_flow,
950         .ipv6_route_input  = ipv6_route_input,
951         .fib6_get_table    = fib6_get_table,
952         .fib6_table_lookup = fib6_table_lookup,
953         .fib6_lookup       = fib6_lookup,
954         .fib6_select_path  = fib6_select_path,
955         .ip6_mtu_from_fib6 = ip6_mtu_from_fib6,
956         .fib6_nh_init      = fib6_nh_init,
957         .fib6_nh_release   = fib6_nh_release,
958         .fib6_update_sernum = fib6_update_sernum_stub,
959         .fib6_rt_update    = fib6_rt_update,
960         .ip6_del_rt        = ip6_del_rt,
961         .udpv6_encap_enable = udpv6_encap_enable,
962         .ndisc_send_na = ndisc_send_na,
963         .nd_tbl = &nd_tbl,
964 };
965 
966 static const struct ipv6_bpf_stub ipv6_bpf_stub_impl = {
967         .inet6_bind = __inet6_bind,
968         .udp6_lib_lookup = __udp6_lib_lookup,
969 };
970 
971 static int __init inet6_init(void)
972 {
973         struct list_head *r;
974         int err = 0;
975 
976         sock_skb_cb_check_size(sizeof(struct inet6_skb_parm));
977 
978         /* Register the socket-side information for inet6_create.  */
979         for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
980                 INIT_LIST_HEAD(r);
981 
982         if (disable_ipv6_mod) {
983                 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
984                 goto out;
985         }
986 
987         err = proto_register(&tcpv6_prot, 1);
988         if (err)
989                 goto out;
990 
991         err = proto_register(&udpv6_prot, 1);
992         if (err)
993                 goto out_unregister_tcp_proto;
994 
995         err = proto_register(&udplitev6_prot, 1);
996         if (err)
997                 goto out_unregister_udp_proto;
998 
999         err = proto_register(&rawv6_prot, 1);
1000         if (err)
1001                 goto out_unregister_udplite_proto;
1002 
1003         err = proto_register(&pingv6_prot, 1);
1004         if (err)
1005                 goto out_unregister_raw_proto;
1006 
1007         /* We MUST register RAW sockets before we create the ICMP6,
1008          * IGMP6, or NDISC control sockets.
1009          */
1010         err = rawv6_init();
1011         if (err)
1012                 goto out_unregister_ping_proto;
1013 
1014         /* Register the family here so that the init calls below will
1015          * be able to create sockets. (?? is this dangerous ??)
1016          */
1017         err = sock_register(&inet6_family_ops);
1018         if (err)
1019                 goto out_sock_register_fail;
1020 
1021         /*
1022          *      ipngwg API draft makes clear that the correct semantics
1023          *      for TCP and UDP is to consider one TCP and UDP instance
1024          *      in a host available by both INET and INET6 APIs and
1025          *      able to communicate via both network protocols.
1026          */
1027 
1028         err = register_pernet_subsys(&inet6_net_ops);
1029         if (err)
1030                 goto register_pernet_fail;
1031         err = ip6_mr_init();
1032         if (err)
1033                 goto ipmr_fail;
1034         err = icmpv6_init();
1035         if (err)
1036                 goto icmp_fail;
1037         err = ndisc_init();
1038         if (err)
1039                 goto ndisc_fail;
1040         err = igmp6_init();
1041         if (err)
1042                 goto igmp_fail;
1043 
1044         err = ipv6_netfilter_init();
1045         if (err)
1046                 goto netfilter_fail;
1047         /* Create /proc/foo6 entries. */
1048 #ifdef CONFIG_PROC_FS
1049         err = -ENOMEM;
1050         if (raw6_proc_init())
1051                 goto proc_raw6_fail;
1052         if (udplite6_proc_init())
1053                 goto proc_udplite6_fail;
1054         if (ipv6_misc_proc_init())
1055                 goto proc_misc6_fail;
1056         if (if6_proc_init())
1057                 goto proc_if6_fail;
1058 #endif
1059         err = ip6_route_init();
1060         if (err)
1061                 goto ip6_route_fail;
1062         err = ndisc_late_init();
1063         if (err)
1064                 goto ndisc_late_fail;
1065         err = ip6_flowlabel_init();
1066         if (err)
1067                 goto ip6_flowlabel_fail;
1068         err = ipv6_anycast_init();
1069         if (err)
1070                 goto ipv6_anycast_fail;
1071         err = addrconf_init();
1072         if (err)
1073                 goto addrconf_fail;
1074 
1075         /* Init v6 extension headers. */
1076         err = ipv6_exthdrs_init();
1077         if (err)
1078                 goto ipv6_exthdrs_fail;
1079 
1080         err = ipv6_frag_init();
1081         if (err)
1082                 goto ipv6_frag_fail;
1083 
1084         /* Init v6 transport protocols. */
1085         err = udpv6_init();
1086         if (err)
1087                 goto udpv6_fail;
1088 
1089         err = udplitev6_init();
1090         if (err)
1091                 goto udplitev6_fail;
1092 
1093         err = udpv6_offload_init();
1094         if (err)
1095                 goto udpv6_offload_fail;
1096 
1097         err = tcpv6_init();
1098         if (err)
1099                 goto tcpv6_fail;
1100 
1101         err = ipv6_packet_init();
1102         if (err)
1103                 goto ipv6_packet_fail;
1104 
1105         err = pingv6_init();
1106         if (err)
1107                 goto pingv6_fail;
1108 
1109         err = calipso_init();
1110         if (err)
1111                 goto calipso_fail;
1112 
1113         err = seg6_init();
1114         if (err)
1115                 goto seg6_fail;
1116 
1117         err = igmp6_late_init();
1118         if (err)
1119                 goto igmp6_late_err;
1120 
1121 #ifdef CONFIG_SYSCTL
1122         err = ipv6_sysctl_register();
1123         if (err)
1124                 goto sysctl_fail;
1125 #endif
1126 
1127         /* ensure that ipv6 stubs are visible only after ipv6 is ready */
1128         wmb();
1129         ipv6_stub = &ipv6_stub_impl;
1130         ipv6_bpf_stub = &ipv6_bpf_stub_impl;
1131 out:
1132         return err;
1133 
1134 #ifdef CONFIG_SYSCTL
1135 sysctl_fail:
1136         igmp6_late_cleanup();
1137 #endif
1138 igmp6_late_err:
1139         seg6_exit();
1140 seg6_fail:
1141         calipso_exit();
1142 calipso_fail:
1143         pingv6_exit();
1144 pingv6_fail:
1145         ipv6_packet_cleanup();
1146 ipv6_packet_fail:
1147         tcpv6_exit();
1148 tcpv6_fail:
1149         udpv6_offload_exit();
1150 udpv6_offload_fail:
1151         udplitev6_exit();
1152 udplitev6_fail:
1153         udpv6_exit();
1154 udpv6_fail:
1155         ipv6_frag_exit();
1156 ipv6_frag_fail:
1157         ipv6_exthdrs_exit();
1158 ipv6_exthdrs_fail:
1159         addrconf_cleanup();
1160 addrconf_fail:
1161         ipv6_anycast_cleanup();
1162 ipv6_anycast_fail:
1163         ip6_flowlabel_cleanup();
1164 ip6_flowlabel_fail:
1165         ndisc_late_cleanup();
1166 ndisc_late_fail:
1167         ip6_route_cleanup();
1168 ip6_route_fail:
1169 #ifdef CONFIG_PROC_FS
1170         if6_proc_exit();
1171 proc_if6_fail:
1172         ipv6_misc_proc_exit();
1173 proc_misc6_fail:
1174         udplite6_proc_exit();
1175 proc_udplite6_fail:
1176         raw6_proc_exit();
1177 proc_raw6_fail:
1178 #endif
1179         ipv6_netfilter_fini();
1180 netfilter_fail:
1181         igmp6_cleanup();
1182 igmp_fail:
1183         ndisc_cleanup();
1184 ndisc_fail:
1185         icmpv6_cleanup();
1186 icmp_fail:
1187         ip6_mr_cleanup();
1188 ipmr_fail:
1189         unregister_pernet_subsys(&inet6_net_ops);
1190 register_pernet_fail:
1191         sock_unregister(PF_INET6);
1192         rtnl_unregister_all(PF_INET6);
1193 out_sock_register_fail:
1194         rawv6_exit();
1195 out_unregister_ping_proto:
1196         proto_unregister(&pingv6_prot);
1197 out_unregister_raw_proto:
1198         proto_unregister(&rawv6_prot);
1199 out_unregister_udplite_proto:
1200         proto_unregister(&udplitev6_prot);
1201 out_unregister_udp_proto:
1202         proto_unregister(&udpv6_prot);
1203 out_unregister_tcp_proto:
1204         proto_unregister(&tcpv6_prot);
1205         goto out;
1206 }
1207 module_init(inet6_init);
1208 
1209 MODULE_ALIAS_NETPROTO(PF_INET6);
1210 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp