net/ipv6/af_inet6.c

   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
  22 #include <linux/module.h>
  23 #include <linux/capability.h>
  24 #include <linux/errno.h>
  25 #include <linux/types.h>
  26 #include <linux/socket.h>
  27 #include <linux/in.h>
  28 #include <linux/kernel.h>
  29 #include <linux/timer.h>
  30 #include <linux/string.h>
  31 #include <linux/sockios.h>
  32 #include <linux/net.h>
  33 #include <linux/fcntl.h>
  34 #include <linux/mm.h>
  35 #include <linux/interrupt.h>
  36 #include <linux/proc_fs.h>
  37 #include <linux/stat.h>
  38 #include <linux/init.h>
  39 #include <linux/slab.h>
  40
  41 #include <linux/inet.h>
  42 #include <linux/netdevice.h>
  43 #include <linux/icmpv6.h>
  44 #include <linux/netfilter_ipv6.h>
  45
  46 #include <net/ip.h>
  47 #include <net/ipv6.h>
  48 #include <net/udp.h>
  49 #include <net/udplite.h>
  50 #include <net/tcp.h>
  51 #include <net/ipip.h>
  52 #include <net/protocol.h>
  53 #include <net/inet_common.h>
  54 #include <net/route.h>
  55 #include <net/transp_v6.h>
  56 #include <net/ip6_route.h>
  57 #include <net/addrconf.h>
  58 #ifdef CONFIG_IPV6_TUNNEL
  59 #include <net/ip6_tunnel.h>
  60 #endif
  61
  62 #include <asm/uaccess.h>
  63 #include <asm/system.h>
  64 #include <linux/mroute6.h>
  65
  66 MODULE_AUTHOR("Cast of dozens");
  67 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
  68 MODULE_LICENSE("GPL");
  69
  70 /* The inetsw6 table contains everything that inet6_create needs to
  71  * build a new socket.
  72  */
  73 static struct list_head inetsw6[SOCK_MAX];
  74 static DEFINE_SPINLOCK(inetsw6_lock);
  75
  76 struct ipv6_params ipv6_defaults = {
  77         .disable_ipv6 = 0,
  78         .autoconf = 1,
  79 };
  80
  81 static int disable_ipv6_mod = 0;
  82
  83 module_param_named(disable, disable_ipv6_mod, int, 0444);
  84 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
  85
  86 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
  87 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
  88
  89 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
  90 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
  91
  92 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
  93 {
  94         const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
  95
  96         return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
  97 }
  98
  99 static int inet6_create(struct net *net, struct socket *sock, int protocol,
 100                         int kern)
 101 {
 102         struct inet_sock *inet;
 103         struct ipv6_pinfo *np;
 104         struct sock *sk;
 105         struct inet_protosw *answer;
 106         struct proto *answer_prot;
 107         unsigned char answer_flags;
 108         char answer_no_check;
 109         int try_loading_module = 0;
 110         int err;
 111
 112         if (sock->type != SOCK_RAW &&
 113             sock->type != SOCK_DGRAM &&
 114             !inet_ehash_secret)
 115                 build_ehash_secret();
 116
 117         /* Look for the requested type/protocol pair. */
 118 lookup_protocol:
 119         err = -ESOCKTNOSUPPORT;
 120         rcu_read_lock();
 121         list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
 122
 123                 err = 0;
 124                 /* Check the non-wild match. */
 125                 if (protocol == answer->protocol) {
 126                         if (protocol != IPPROTO_IP)
 127                                 break;
 128                 } else {
 129                         /* Check for the two wild cases. */
 130                         if (IPPROTO_IP == protocol) {
 131                                 protocol = answer->protocol;
 132                                 break;
 133                         }
 134                         if (IPPROTO_IP == answer->protocol)
 135                                 break;
 136                 }
 137                 err = -EPROTONOSUPPORT;
 138         }
 139
 140         if (err) {
 141                 if (try_loading_module < 2) {
 142                         rcu_read_unlock();
 143                         /*
 144                          * Be more specific, e.g. net-pf-10-proto-132-type-1
 145                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
 146                          */
 147                         if (++try_loading_module == 1)
 148                                 request_module("net-pf-%d-proto-%d-type-%d",
 149                                                 PF_INET6, protocol, sock->type);
 150                         /*
 151                          * Fall back to generic, e.g. net-pf-10-proto-132
 152                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
 153                          */
 154                         else
 155                                 request_module("net-pf-%d-proto-%d",
 156                                                 PF_INET6, protocol);
 157                         goto lookup_protocol;
 158                 } else
 159                         goto out_rcu_unlock;
 160         }
 161
 162         err = -EPERM;
 163         if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
 164                 goto out_rcu_unlock;
 165
 166         sock->ops = answer->ops;
 167         answer_prot = answer->prot;
 168         answer_no_check = answer->no_check;
 169         answer_flags = answer->flags;
 170         rcu_read_unlock();
 171
 172         WARN_ON(answer_prot->slab == NULL);
 173
 174         err = -ENOBUFS;
 175         sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot);
 176         if (sk == NULL)
 177                 goto out;
 178
 179         sock_init_data(sock, sk);
 180
 181         err = 0;
 182         sk->sk_no_check = answer_no_check;
 183         if (INET_PROTOSW_REUSE & answer_flags)
 184                 sk->sk_reuse = 1;
 185
 186         inet = inet_sk(sk);
 187         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
 188
 189         if (SOCK_RAW == sock->type) {
 190                 inet->inet_num = protocol;
 191                 if (IPPROTO_RAW == protocol)
 192                         inet->hdrincl = 1;
 193         }
 194
 195         sk->sk_destruct         = inet_sock_destruct;
 196         sk->sk_family           = PF_INET6;
 197         sk->sk_protocol         = protocol;
 198
 199         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
 200
 201         inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
 202         np->hop_limit   = -1;
 203         np->mcast_hops  = IPV6_DEFAULT_MCASTHOPS;
 204         np->mc_loop     = 1;
 205         np->pmtudisc    = IPV6_PMTUDISC_WANT;
 206         np->ipv6only    = net->ipv6.sysctl.bindv6only;
 207
 208         /* Init the ipv4 part of the socket since we can have sockets
 209          * using v6 API for ipv4.
 210          */
 211         inet->uc_ttl    = -1;
 212
 213         inet->mc_loop   = 1;
 214         inet->mc_ttl    = 1;
 215         inet->mc_index  = 0;
 216         inet->mc_list   = NULL;
 217
 218         if (ipv4_config.no_pmtu_disc)
 219                 inet->pmtudisc = IP_PMTUDISC_DONT;
 220         else
 221                 inet->pmtudisc = IP_PMTUDISC_WANT;
 222         /*
 223          * Increment only the relevant sk_prot->socks debug field, this changes
 224          * the previous behaviour of incrementing both the equivalent to
 225          * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
 226          *
 227          * This allows better debug granularity as we'll know exactly how many
 228          * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
 229          * transport protocol socks. -acme
 230          */
 231         sk_refcnt_debug_inc(sk);
 232
 233         if (inet->inet_num) {
 234                 /* It assumes that any protocol which allows
 235                  * the user to assign a number at socket
 236                  * creation time automatically shares.
 237                  */
 238                 inet->inet_sport = htons(inet->inet_num);
 239                 sk->sk_prot->hash(sk);
 240         }
 241         if (sk->sk_prot->init) {
 242                 err = sk->sk_prot->init(sk);
 243                 if (err) {
 244                         sk_common_release(sk);
 245                         goto out;
 246                 }
 247         }
 248 out:
 249         return err;
 250 out_rcu_unlock:
 251         rcu_read_unlock();
 252         goto out;
 253 }
 254
 255
 256 /* bind for INET6 API */
 257 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 258 {
 259         struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
 260         struct sock *sk = sock->sk;
 261         struct inet_sock *inet = inet_sk(sk);
 262         struct ipv6_pinfo *np = inet6_sk(sk);
 263         struct net *net = sock_net(sk);
 264         __be32 v4addr = 0;
 265         unsigned short snum;
 266         int addr_type = 0;
 267         int err = 0;
 268
 269         /* If the socket has its own bind function then use it. */
 270         if (sk->sk_prot->bind)
 271                 return sk->sk_prot->bind(sk, uaddr, addr_len);
 272
 273         if (addr_len < SIN6_LEN_RFC2133)
 274                 return -EINVAL;
 275
 276         if (addr->sin6_family != AF_INET6)
 277                 return -EAFNOSUPPORT;
 278
 279         addr_type = ipv6_addr_type(&addr->sin6_addr);
 280         if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
 281                 return -EINVAL;
 282
 283         snum = ntohs(addr->sin6_port);
 284         if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
 285                 return -EACCES;
 286
 287         lock_sock(sk);
 288
 289         /* Check these errors (active socket, double bind). */
 290         if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
 291                 err = -EINVAL;
 292                 goto out;
 293         }
 294
 295         /* Check if the address belongs to the host. */
 296         if (addr_type == IPV6_ADDR_MAPPED) {
 297                 int chk_addr_ret;
 298
 299                 /* Binding to v4-mapped address on a v6-only socket
 300                  * makes no sense
 301                  */
 302                 if (np->ipv6only) {
 303                         err = -EINVAL;
 304                         goto out;
 305                 }
 306
 307                 /* Reproduce AF_INET checks to make the bindings consistent */
 308                 v4addr = addr->sin6_addr.s6_addr32[3];
 309                 chk_addr_ret = inet_addr_type(net, v4addr);
 310                 if (!sysctl_ip_nonlocal_bind &&
 311                     !(inet->freebind || inet->transparent) &&
 312                     v4addr != htonl(INADDR_ANY) &&
 313                     chk_addr_ret != RTN_LOCAL &&
 314                     chk_addr_ret != RTN_MULTICAST &&
 315                     chk_addr_ret != RTN_BROADCAST) {
 316                         err = -EADDRNOTAVAIL;
 317                         goto out;
 318                 }
 319         } else {
 320                 if (addr_type != IPV6_ADDR_ANY) {
 321                         struct net_device *dev = NULL;
 322
 323                         rcu_read_lock();
 324                         if (addr_type & IPV6_ADDR_LINKLOCAL) {
 325                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 326                                     addr->sin6_scope_id) {
 327                                         /* Override any existing binding, if another one
 328                                          * is supplied by user.
 329                                          */
 330                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
 331                                 }
 332
 333                                 /* Binding to link-local address requires an interface */
 334                                 if (!sk->sk_bound_dev_if) {
 335                                         err = -EINVAL;
 336                                         goto out_unlock;
 337                                 }
 338                                 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
 339                                 if (!dev) {
 340                                         err = -ENODEV;
 341                                         goto out_unlock;
 342                                 }
 343                         }
 344
 345                         /* ipv4 addr of the socket is invalid.  Only the
 346                          * unspecified and mapped address have a v4 equivalent.
 347                          */
 348                         v4addr = LOOPBACK4_IPV6;
 349                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
 350                                 if (!inet->transparent &&
 351                                     !ipv6_chk_addr(net, &addr->sin6_addr,
 352                                                    dev, 0)) {
 353                                         err = -EADDRNOTAVAIL;
 354                                         goto out_unlock;
 355                                 }
 356                         }
 357                         rcu_read_unlock();
 358                 }
 359         }
 360
 361         inet->inet_rcv_saddr = v4addr;
 362         inet->inet_saddr = v4addr;
 363
 364         ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
 365
 366         if (!(addr_type & IPV6_ADDR_MULTICAST))
 367                 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
 368
 369         /* Make sure we are allowed to bind here. */
 370         if (sk->sk_prot->get_port(sk, snum)) {
 371                 inet_reset_saddr(sk);
 372                 err = -EADDRINUSE;
 373                 goto out;
 374         }
 375
 376         if (addr_type != IPV6_ADDR_ANY) {
 377                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
 378                 if (addr_type != IPV6_ADDR_MAPPED)
 379                         np->ipv6only = 1;
 380         }
 381         if (snum)
 382                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
 383         inet->inet_sport = htons(inet->inet_num);
 384         inet->inet_dport = 0;
 385         inet->inet_daddr = 0;
 386 out:
 387         release_sock(sk);
 388         return err;
 389 out_unlock:
 390         rcu_read_unlock();
 391         goto out;
 392 }
 393
 394 EXPORT_SYMBOL(inet6_bind);
 395
 396 int inet6_release(struct socket *sock)
 397 {
 398         struct sock *sk = sock->sk;
 399
 400         if (sk == NULL)
 401                 return -EINVAL;
 402
 403         /* Free mc lists */
 404         ipv6_sock_mc_close(sk);
 405
 406         /* Free ac lists */
 407         ipv6_sock_ac_close(sk);
 408
 409         return inet_release(sock);
 410 }
 411
 412 EXPORT_SYMBOL(inet6_release);
 413
 414 void inet6_destroy_sock(struct sock *sk)
 415 {
 416         struct ipv6_pinfo *np = inet6_sk(sk);
 417         struct sk_buff *skb;
 418         struct ipv6_txoptions *opt;
 419
 420         /* Release rx options */
 421
 422         if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
 423                 kfree_skb(skb);
 424
 425         if ((skb = xchg(&np->rxpmtu, NULL)) != NULL)
 426                 kfree_skb(skb);
 427
 428         /* Free flowlabels */
 429         fl6_free_socklist(sk);
 430
 431         /* Free tx options */
 432
 433         if ((opt = xchg(&np->opt, NULL)) != NULL)
 434                 sock_kfree_s(sk, opt, opt->tot_len);
 435 }
 436
 437 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
 438
 439 /*
 440  *      This does both peername and sockname.
 441  */
 442
 443 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 444                  int *uaddr_len, int peer)
 445 {
 446         struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
 447         struct sock *sk = sock->sk;
 448         struct inet_sock *inet = inet_sk(sk);
 449         struct ipv6_pinfo *np = inet6_sk(sk);
 450
 451         sin->sin6_family = AF_INET6;
 452         sin->sin6_flowinfo = 0;
 453         sin->sin6_scope_id = 0;
 454         if (peer) {
 455                 if (!inet->inet_dport)
 456                         return -ENOTCONN;
 457                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
 458                     peer == 1)
 459                         return -ENOTCONN;
 460                 sin->sin6_port = inet->inet_dport;
 461                 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
 462                 if (np->sndflow)
 463                         sin->sin6_flowinfo = np->flow_label;
 464         } else {
 465                 if (ipv6_addr_any(&np->rcv_saddr))
 466                         ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
 467                 else
 468                         ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
 469
 470                 sin->sin6_port = inet->inet_sport;
 471         }
 472         if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
 473                 sin->sin6_scope_id = sk->sk_bound_dev_if;
 474         *uaddr_len = sizeof(*sin);
 475         return 0;
 476 }
 477
 478 EXPORT_SYMBOL(inet6_getname);
 479
 480 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 481 {
 482         struct sock *sk = sock->sk;
 483         struct net *net = sock_net(sk);
 484
 485         switch(cmd)
 486         {
 487         case SIOCGSTAMP:
 488                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
 489
 490         case SIOCGSTAMPNS:
 491                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
 492
 493         case SIOCADDRT:
 494         case SIOCDELRT:
 495
 496                 return ipv6_route_ioctl(net, cmd, (void __user *)arg);
 497
 498         case SIOCSIFADDR:
 499                 return addrconf_add_ifaddr(net, (void __user *) arg);
 500         case SIOCDIFADDR:
 501                 return addrconf_del_ifaddr(net, (void __user *) arg);
 502         case SIOCSIFDSTADDR:
 503                 return addrconf_set_dstaddr(net, (void __user *) arg);
 504         default:
 505                 if (!sk->sk_prot->ioctl)
 506                         return -ENOIOCTLCMD;
 507                 return sk->sk_prot->ioctl(sk, cmd, arg);
 508         }
 509         /*NOTREACHED*/
 510         return 0;
 511 }
 512
 513 EXPORT_SYMBOL(inet6_ioctl);
 514
 515 const struct proto_ops inet6_stream_ops = {
 516         .family            = PF_INET6,
 517         .owner             = THIS_MODULE,
 518         .release           = inet6_release,
 519         .bind              = inet6_bind,
 520         .connect           = inet_stream_connect,       /* ok           */
 521         .socketpair        = sock_no_socketpair,        /* a do nothing */
 522         .accept            = inet_accept,               /* ok           */
 523         .getname           = inet6_getname,
 524         .poll              = tcp_poll,                  /* ok           */
 525         .ioctl             = inet6_ioctl,               /* must change  */
 526         .listen            = inet_listen,               /* ok           */
 527         .shutdown          = inet_shutdown,             /* ok           */
 528         .setsockopt        = sock_common_setsockopt,    /* ok           */
 529         .getsockopt        = sock_common_getsockopt,    /* ok           */
 530         .sendmsg           = inet_sendmsg,              /* ok           */
 531         .recvmsg           = inet_recvmsg,              /* ok           */
 532         .mmap              = sock_no_mmap,
 533         .sendpage          = inet_sendpage,
 534         .splice_read       = tcp_splice_read,
 535 #ifdef CONFIG_COMPAT
 536         .compat_setsockopt = compat_sock_common_setsockopt,
 537         .compat_getsockopt = compat_sock_common_getsockopt,
 538 #endif
 539 };
 540
 541 const struct proto_ops inet6_dgram_ops = {
 542         .family            = PF_INET6,
 543         .owner             = THIS_MODULE,
 544         .release           = inet6_release,
 545         .bind              = inet6_bind,
 546         .connect           = inet_dgram_connect,        /* ok           */
 547         .socketpair        = sock_no_socketpair,        /* a do nothing */
 548         .accept            = sock_no_accept,            /* a do nothing */
 549         .getname           = inet6_getname,
 550         .poll              = udp_poll,                  /* ok           */
 551         .ioctl             = inet6_ioctl,               /* must change  */
 552         .listen            = sock_no_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          = sock_no_sendpage,
 560 #ifdef CONFIG_COMPAT
 561         .compat_setsockopt = compat_sock_common_setsockopt,
 562         .compat_getsockopt = compat_sock_common_getsockopt,
 563 #endif
 564 };
 565
 566 static const struct net_proto_family inet6_family_ops = {
 567         .family = PF_INET6,
 568         .create = inet6_create,
 569         .owner  = THIS_MODULE,
 570 };
 571
 572 int inet6_register_protosw(struct inet_protosw *p)
 573 {
 574         struct list_head *lh;
 575         struct inet_protosw *answer;
 576         struct list_head *last_perm;
 577         int protocol = p->protocol;
 578         int ret;
 579
 580         spin_lock_bh(&inetsw6_lock);
 581
 582         ret = -EINVAL;
 583         if (p->type >= SOCK_MAX)
 584                 goto out_illegal;
 585
 586         /* If we are trying to override a permanent protocol, bail. */
 587         answer = NULL;
 588         ret = -EPERM;
 589         last_perm = &inetsw6[p->type];
 590         list_for_each(lh, &inetsw6[p->type]) {
 591                 answer = list_entry(lh, struct inet_protosw, list);
 592
 593                 /* Check only the non-wild match. */
 594                 if (INET_PROTOSW_PERMANENT & answer->flags) {
 595                         if (protocol == answer->protocol)
 596                                 break;
 597                         last_perm = lh;
 598                 }
 599
 600                 answer = NULL;
 601         }
 602         if (answer)
 603                 goto out_permanent;
 604
 605         /* Add the new entry after the last permanent entry if any, so that
 606          * the new entry does not override a permanent entry when matched with
 607          * a wild-card protocol. But it is allowed to override any existing
 608          * non-permanent entry.  This means that when we remove this entry, the
 609          * system automatically returns to the old behavior.
 610          */
 611         list_add_rcu(&p->list, last_perm);
 612         ret = 0;
 613 out:
 614         spin_unlock_bh(&inetsw6_lock);
 615         return ret;
 616
 617 out_permanent:
 618         printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
 619                protocol);
 620         goto out;
 621
 622 out_illegal:
 623         printk(KERN_ERR
 624                "Ignoring attempt to register invalid socket type %d.\n",
 625                p->type);
 626         goto out;
 627 }
 628
 629 EXPORT_SYMBOL(inet6_register_protosw);
 630
 631 void
 632 inet6_unregister_protosw(struct inet_protosw *p)
 633 {
 634         if (INET_PROTOSW_PERMANENT & p->flags) {
 635                 printk(KERN_ERR
 636                        "Attempt to unregister permanent protocol %d.\n",
 637                        p->protocol);
 638         } else {
 639                 spin_lock_bh(&inetsw6_lock);
 640                 list_del_rcu(&p->list);
 641                 spin_unlock_bh(&inetsw6_lock);
 642
 643                 synchronize_net();
 644         }
 645 }
 646
 647 EXPORT_SYMBOL(inet6_unregister_protosw);
 648
 649 int inet6_sk_rebuild_header(struct sock *sk)
 650 {
 651         struct ipv6_pinfo *np = inet6_sk(sk);
 652         struct dst_entry *dst;
 653
 654         dst = __sk_dst_check(sk, np->dst_cookie);
 655
 656         if (dst == NULL) {
 657                 struct inet_sock *inet = inet_sk(sk);
 658                 struct in6_addr *final_p, final;
 659                 struct flowi6 fl6;
 660
 661                 memset(&fl6, 0, sizeof(fl6));
 662                 fl6.flowi6_proto = sk->sk_protocol;
 663                 ipv6_addr_copy(&fl6.daddr, &np->daddr);
 664                 ipv6_addr_copy(&fl6.saddr, &np->saddr);
 665                 fl6.flowlabel = np->flow_label;
 666                 fl6.flowi6_oif = sk->sk_bound_dev_if;
 667                 fl6.flowi6_mark = sk->sk_mark;
 668                 fl6.fl6_dport = inet->inet_dport;
 669                 fl6.fl6_sport = inet->inet_sport;
 670                 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
 671
 672                 final_p = fl6_update_dst(&fl6, np->opt, &final);
 673
 674                 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
 675                 if (IS_ERR(dst)) {
 676                         sk->sk_route_caps = 0;
 677                         sk->sk_err_soft = -PTR_ERR(dst);
 678                         return PTR_ERR(dst);
 679                 }
 680
 681                 __ip6_dst_store(sk, dst, NULL, NULL);
 682         }
 683
 684         return 0;
 685 }
 686
 687 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
 688
 689 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
 690 {
 691         struct ipv6_pinfo *np = inet6_sk(sk);
 692         struct inet6_skb_parm *opt = IP6CB(skb);
 693
 694         if (np->rxopt.all) {
 695                 if ((opt->hop && (np->rxopt.bits.hopopts ||
 696                                   np->rxopt.bits.ohopopts)) ||
 697                     ((IPV6_FLOWINFO_MASK &
 698                       *(__be32 *)skb_network_header(skb)) &&
 699                      np->rxopt.bits.rxflow) ||
 700                     (opt->srcrt && (np->rxopt.bits.srcrt ||
 701                      np->rxopt.bits.osrcrt)) ||
 702                     ((opt->dst1 || opt->dst0) &&
 703                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
 704                         return 1;
 705         }
 706         return 0;
 707 }
 708
 709 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
 710
 711 static int ipv6_gso_pull_exthdrs(struct sk_buff *skb, int proto)
 712 {
 713         const struct inet6_protocol *ops = NULL;
 714
 715         for (;;) {
 716                 struct ipv6_opt_hdr *opth;
 717                 int len;
 718
 719                 if (proto != NEXTHDR_HOP) {
 720                         ops = rcu_dereference(inet6_protos[proto]);
 721
 722                         if (unlikely(!ops))
 723                                 break;
 724
 725                         if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
 726                                 break;
 727                 }
 728
 729                 if (unlikely(!pskb_may_pull(skb, 8)))
 730                         break;
 731
 732                 opth = (void *)skb->data;
 733                 len = ipv6_optlen(opth);
 734
 735                 if (unlikely(!pskb_may_pull(skb, len)))
 736                         break;
 737
 738                 proto = opth->nexthdr;
 739                 __skb_pull(skb, len);
 740         }
 741
 742         return proto;
 743 }
 744
 745 static int ipv6_gso_send_check(struct sk_buff *skb)
 746 {
 747         const struct ipv6hdr *ipv6h;
 748         const struct inet6_protocol *ops;
 749         int err = -EINVAL;
 750
 751         if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
 752                 goto out;
 753
 754         ipv6h = ipv6_hdr(skb);
 755         __skb_pull(skb, sizeof(*ipv6h));
 756         err = -EPROTONOSUPPORT;
 757
 758         rcu_read_lock();
 759         ops = rcu_dereference(inet6_protos[
 760                 ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]);
 761
 762         if (likely(ops && ops->gso_send_check)) {
 763                 skb_reset_transport_header(skb);
 764                 err = ops->gso_send_check(skb);
 765         }
 766         rcu_read_unlock();
 767
 768 out:
 769         return err;
 770 }
 771
 772 static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, u32 features)
 773 {
 774         struct sk_buff *segs = ERR_PTR(-EINVAL);
 775         struct ipv6hdr *ipv6h;
 776         const struct inet6_protocol *ops;
 777         int proto;
 778         struct frag_hdr *fptr;
 779         unsigned int unfrag_ip6hlen;
 780         u8 *prevhdr;
 781         int offset = 0;
 782
 783         if (!(features & NETIF_F_V6_CSUM))
 784                 features &= ~NETIF_F_SG;
 785
 786         if (unlikely(skb_shinfo(skb)->gso_type &
 787                      ~(SKB_GSO_UDP |
 788                        SKB_GSO_DODGY |
 789                        SKB_GSO_TCP_ECN |
 790                        SKB_GSO_TCPV6 |
 791                        0)))
 792                 goto out;
 793
 794         if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
 795                 goto out;
 796
 797         ipv6h = ipv6_hdr(skb);
 798         __skb_pull(skb, sizeof(*ipv6h));
 799         segs = ERR_PTR(-EPROTONOSUPPORT);
 800
 801         proto = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
 802         rcu_read_lock();
 803         ops = rcu_dereference(inet6_protos[proto]);
 804         if (likely(ops && ops->gso_segment)) {
 805                 skb_reset_transport_header(skb);
 806                 segs = ops->gso_segment(skb, features);
 807         }
 808         rcu_read_unlock();
 809
 810         if (IS_ERR(segs))
 811                 goto out;
 812
 813         for (skb = segs; skb; skb = skb->next) {
 814                 ipv6h = ipv6_hdr(skb);
 815                 ipv6h->payload_len = htons(skb->len - skb->mac_len -
 816                                            sizeof(*ipv6h));
 817                 if (proto == IPPROTO_UDP) {
 818                         unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
 819                         fptr = (struct frag_hdr *)(skb_network_header(skb) +
 820                                 unfrag_ip6hlen);
 821                         fptr->frag_off = htons(offset);
 822                         if (skb->next != NULL)
 823                                 fptr->frag_off |= htons(IP6_MF);
 824                         offset += (ntohs(ipv6h->payload_len) -
 825                                    sizeof(struct frag_hdr));
 826                 }
 827         }
 828
 829 out:
 830         return segs;
 831 }
 832
 833 struct ipv6_gro_cb {
 834         struct napi_gro_cb napi;
 835         int proto;
 836 };
 837
 838 #define IPV6_GRO_CB(skb) ((struct ipv6_gro_cb *)(skb)->cb)
 839
 840 static struct sk_buff **ipv6_gro_receive(struct sk_buff **head,
 841                                          struct sk_buff *skb)
 842 {
 843         const struct inet6_protocol *ops;
 844         struct sk_buff **pp = NULL;
 845         struct sk_buff *p;
 846         struct ipv6hdr *iph;
 847         unsigned int nlen;
 848         unsigned int hlen;
 849         unsigned int off;
 850         int flush = 1;
 851         int proto;
 852         __wsum csum;
 853
 854         off = skb_gro_offset(skb);
 855         hlen = off + sizeof(*iph);
 856         iph = skb_gro_header_fast(skb, off);
 857         if (skb_gro_header_hard(skb, hlen)) {
 858                 iph = skb_gro_header_slow(skb, hlen, off);
 859                 if (unlikely(!iph))
 860                         goto out;
 861         }
 862
 863         skb_gro_pull(skb, sizeof(*iph));
 864         skb_set_transport_header(skb, skb_gro_offset(skb));
 865
 866         flush += ntohs(iph->payload_len) != skb_gro_len(skb);
 867
 868         rcu_read_lock();
 869         proto = iph->nexthdr;
 870         ops = rcu_dereference(inet6_protos[proto]);
 871         if (!ops || !ops->gro_receive) {
 872                 __pskb_pull(skb, skb_gro_offset(skb));
 873                 proto = ipv6_gso_pull_exthdrs(skb, proto);
 874                 skb_gro_pull(skb, -skb_transport_offset(skb));
 875                 skb_reset_transport_header(skb);
 876                 __skb_push(skb, skb_gro_offset(skb));
 877
 878                 ops = rcu_dereference(inet6_protos[proto]);
 879                 if (!ops || !ops->gro_receive)
 880                         goto out_unlock;
 881
 882                 iph = ipv6_hdr(skb);
 883         }
 884
 885         IPV6_GRO_CB(skb)->proto = proto;
 886
 887         flush--;
 888         nlen = skb_network_header_len(skb);
 889
 890         for (p = *head; p; p = p->next) {
 891                 struct ipv6hdr *iph2;
 892
 893                 if (!NAPI_GRO_CB(p)->same_flow)
 894                         continue;
 895
 896                 iph2 = ipv6_hdr(p);
 897
 898                 /* All fields must match except length. */
 899                 if (nlen != skb_network_header_len(p) ||
 900                     memcmp(iph, iph2, offsetof(struct ipv6hdr, payload_len)) ||
 901                     memcmp(&iph->nexthdr, &iph2->nexthdr,
 902                            nlen - offsetof(struct ipv6hdr, nexthdr))) {
 903                         NAPI_GRO_CB(p)->same_flow = 0;
 904                         continue;
 905                 }
 906
 907                 NAPI_GRO_CB(p)->flush |= flush;
 908         }
 909
 910         NAPI_GRO_CB(skb)->flush |= flush;
 911
 912         csum = skb->csum;
 913         skb_postpull_rcsum(skb, iph, skb_network_header_len(skb));
 914
 915         pp = ops->gro_receive(head, skb);
 916
 917         skb->csum = csum;
 918
 919 out_unlock:
 920         rcu_read_unlock();
 921
 922 out:
 923         NAPI_GRO_CB(skb)->flush |= flush;
 924
 925         return pp;
 926 }
 927
 928 static int ipv6_gro_complete(struct sk_buff *skb)
 929 {
 930         const struct inet6_protocol *ops;
 931         struct ipv6hdr *iph = ipv6_hdr(skb);
 932         int err = -ENOSYS;
 933
 934         iph->payload_len = htons(skb->len - skb_network_offset(skb) -
 935                                  sizeof(*iph));
 936
 937         rcu_read_lock();
 938         ops = rcu_dereference(inet6_protos[IPV6_GRO_CB(skb)->proto]);
 939         if (WARN_ON(!ops || !ops->gro_complete))
 940                 goto out_unlock;
 941
 942         err = ops->gro_complete(skb);
 943
 944 out_unlock:
 945         rcu_read_unlock();
 946
 947         return err;
 948 }
 949
 950 static struct packet_type ipv6_packet_type __read_mostly = {
 951         .type = cpu_to_be16(ETH_P_IPV6),
 952         .func = ipv6_rcv,
 953         .gso_send_check = ipv6_gso_send_check,
 954         .gso_segment = ipv6_gso_segment,
 955         .gro_receive = ipv6_gro_receive,
 956         .gro_complete = ipv6_gro_complete,
 957 };
 958
 959 static int __init ipv6_packet_init(void)
 960 {
 961         dev_add_pack(&ipv6_packet_type);
 962         return 0;
 963 }
 964
 965 static void ipv6_packet_cleanup(void)
 966 {
 967         dev_remove_pack(&ipv6_packet_type);
 968 }
 969
 970 static int __net_init ipv6_init_mibs(struct net *net)
 971 {
 972         if (snmp_mib_init((void __percpu **)net->mib.udp_stats_in6,
 973                           sizeof(struct udp_mib),
 974                           __alignof__(struct udp_mib)) < 0)
 975                 return -ENOMEM;
 976         if (snmp_mib_init((void __percpu **)net->mib.udplite_stats_in6,
 977                           sizeof(struct udp_mib),
 978                           __alignof__(struct udp_mib)) < 0)
 979                 goto err_udplite_mib;
 980         if (snmp_mib_init((void __percpu **)net->mib.ipv6_statistics,
 981                           sizeof(struct ipstats_mib),
 982                           __alignof__(struct ipstats_mib)) < 0)
 983                 goto err_ip_mib;
 984         if (snmp_mib_init((void __percpu **)net->mib.icmpv6_statistics,
 985                           sizeof(struct icmpv6_mib),
 986                           __alignof__(struct icmpv6_mib)) < 0)
 987                 goto err_icmp_mib;
 988         if (snmp_mib_init((void __percpu **)net->mib.icmpv6msg_statistics,
 989                           sizeof(struct icmpv6msg_mib),
 990                           __alignof__(struct icmpv6msg_mib)) < 0)
 991                 goto err_icmpmsg_mib;
 992         return 0;
 993
 994 err_icmpmsg_mib:
 995         snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics);
 996 err_icmp_mib:
 997         snmp_mib_free((void __percpu **)net->mib.ipv6_statistics);
 998 err_ip_mib:
 999         snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6);
1000 err_udplite_mib:
1001         snmp_mib_free((void __percpu **)net->mib.udp_stats_in6);
1002         return -ENOMEM;
1003 }
1004
1005 static void ipv6_cleanup_mibs(struct net *net)
1006 {
1007         snmp_mib_free((void __percpu **)net->mib.udp_stats_in6);
1008         snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6);
1009         snmp_mib_free((void __percpu **)net->mib.ipv6_statistics);
1010         snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics);
1011         snmp_mib_free((void __percpu **)net->mib.icmpv6msg_statistics);
1012 }
1013
1014 static int __net_init inet6_net_init(struct net *net)
1015 {
1016         int err = 0;
1017
1018         net->ipv6.sysctl.bindv6only = 0;
1019         net->ipv6.sysctl.icmpv6_time = 1*HZ;
1020
1021         err = ipv6_init_mibs(net);
1022         if (err)
1023                 return err;
1024 #ifdef CONFIG_PROC_FS
1025         err = udp6_proc_init(net);
1026         if (err)
1027                 goto out;
1028         err = tcp6_proc_init(net);
1029         if (err)
1030                 goto proc_tcp6_fail;
1031         err = ac6_proc_init(net);
1032         if (err)
1033                 goto proc_ac6_fail;
1034 #endif
1035         return err;
1036
1037 #ifdef CONFIG_PROC_FS
1038 proc_ac6_fail:
1039         tcp6_proc_exit(net);
1040 proc_tcp6_fail:
1041         udp6_proc_exit(net);
1042 out:
1043         ipv6_cleanup_mibs(net);
1044         return err;
1045 #endif
1046 }
1047
1048 static void __net_exit inet6_net_exit(struct net *net)
1049 {
1050 #ifdef CONFIG_PROC_FS
1051         udp6_proc_exit(net);
1052         tcp6_proc_exit(net);
1053         ac6_proc_exit(net);
1054 #endif
1055         ipv6_cleanup_mibs(net);
1056 }
1057
1058 static struct pernet_operations inet6_net_ops = {
1059         .init = inet6_net_init,
1060         .exit = inet6_net_exit,
1061 };
1062
1063 static int __init inet6_init(void)
1064 {
1065         struct sk_buff *dummy_skb;
1066         struct list_head *r;
1067         int err = 0;
1068
1069         BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
1070
1071         /* Register the socket-side information for inet6_create.  */
1072         for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
1073                 INIT_LIST_HEAD(r);
1074
1075         if (disable_ipv6_mod) {
1076                 printk(KERN_INFO
1077                        "IPv6: Loaded, but administratively disabled, "
1078                        "reboot required to enable\n");
1079                 goto out;
1080         }
1081
1082         err = proto_register(&tcpv6_prot, 1);
1083         if (err)
1084                 goto out;
1085
1086         err = proto_register(&udpv6_prot, 1);
1087         if (err)
1088                 goto out_unregister_tcp_proto;
1089
1090         err = proto_register(&udplitev6_prot, 1);
1091         if (err)
1092                 goto out_unregister_udp_proto;
1093
1094         err = proto_register(&rawv6_prot, 1);
1095         if (err)
1096                 goto out_unregister_udplite_proto;
1097
1098
1099         /* We MUST register RAW sockets before we create the ICMP6,
1100          * IGMP6, or NDISC control sockets.
1101          */
1102         err = rawv6_init();
1103         if (err)
1104                 goto out_unregister_raw_proto;
1105
1106         /* Register the family here so that the init calls below will
1107          * be able to create sockets. (?? is this dangerous ??)
1108          */
1109         err = sock_register(&inet6_family_ops);
1110         if (err)
1111                 goto out_sock_register_fail;
1112
1113 #ifdef CONFIG_SYSCTL
1114         err = ipv6_static_sysctl_register();
1115         if (err)
1116                 goto static_sysctl_fail;
1117 #endif
1118         /*
1119          *      ipngwg API draft makes clear that the correct semantics
1120          *      for TCP and UDP is to consider one TCP and UDP instance
1121          *      in a host available by both INET and INET6 APIs and
1122          *      able to communicate via both network protocols.
1123          */
1124
1125         err = register_pernet_subsys(&inet6_net_ops);
1126         if (err)
1127                 goto register_pernet_fail;
1128         err = icmpv6_init();
1129         if (err)
1130                 goto icmp_fail;
1131         err = ip6_mr_init();
1132         if (err)
1133                 goto ipmr_fail;
1134         err = ndisc_init();
1135         if (err)
1136                 goto ndisc_fail;
1137         err = igmp6_init();
1138         if (err)
1139                 goto igmp_fail;
1140         err = ipv6_netfilter_init();
1141         if (err)
1142                 goto netfilter_fail;
1143         /* Create /proc/foo6 entries. */
1144 #ifdef CONFIG_PROC_FS
1145         err = -ENOMEM;
1146         if (raw6_proc_init())
1147                 goto proc_raw6_fail;
1148         if (udplite6_proc_init())
1149                 goto proc_udplite6_fail;
1150         if (ipv6_misc_proc_init())
1151                 goto proc_misc6_fail;
1152         if (if6_proc_init())
1153                 goto proc_if6_fail;
1154 #endif
1155         err = ip6_route_init();
1156         if (err)
1157                 goto ip6_route_fail;
1158         err = ip6_flowlabel_init();
1159         if (err)
1160                 goto ip6_flowlabel_fail;
1161         err = addrconf_init();
1162         if (err)
1163                 goto addrconf_fail;
1164
1165         /* Init v6 extension headers. */
1166         err = ipv6_exthdrs_init();
1167         if (err)
1168                 goto ipv6_exthdrs_fail;
1169
1170         err = ipv6_frag_init();
1171         if (err)
1172                 goto ipv6_frag_fail;
1173
1174         /* Init v6 transport protocols. */
1175         err = udpv6_init();
1176         if (err)
1177                 goto udpv6_fail;
1178
1179         err = udplitev6_init();
1180         if (err)
1181                 goto udplitev6_fail;
1182
1183         err = tcpv6_init();
1184         if (err)
1185                 goto tcpv6_fail;
1186
1187         err = ipv6_packet_init();
1188         if (err)
1189                 goto ipv6_packet_fail;
1190
1191 #ifdef CONFIG_SYSCTL
1192         err = ipv6_sysctl_register();
1193         if (err)
1194                 goto sysctl_fail;
1195 #endif
1196 out:
1197         return err;
1198
1199 #ifdef CONFIG_SYSCTL
1200 sysctl_fail:
1201         ipv6_packet_cleanup();
1202 #endif
1203 ipv6_packet_fail:
1204         tcpv6_exit();
1205 tcpv6_fail:
1206         udplitev6_exit();
1207 udplitev6_fail:
1208         udpv6_exit();
1209 udpv6_fail:
1210         ipv6_frag_exit();
1211 ipv6_frag_fail:
1212         ipv6_exthdrs_exit();
1213 ipv6_exthdrs_fail:
1214         addrconf_cleanup();
1215 addrconf_fail:
1216         ip6_flowlabel_cleanup();
1217 ip6_flowlabel_fail:
1218         ip6_route_cleanup();
1219 ip6_route_fail:
1220 #ifdef CONFIG_PROC_FS
1221         if6_proc_exit();
1222 proc_if6_fail:
1223         ipv6_misc_proc_exit();
1224 proc_misc6_fail:
1225         udplite6_proc_exit();
1226 proc_udplite6_fail:
1227         raw6_proc_exit();
1228 proc_raw6_fail:
1229 #endif
1230         ipv6_netfilter_fini();
1231 netfilter_fail:
1232         igmp6_cleanup();
1233 igmp_fail:
1234         ndisc_cleanup();
1235 ndisc_fail:
1236         ip6_mr_cleanup();
1237 ipmr_fail:
1238         icmpv6_cleanup();
1239 icmp_fail:
1240         unregister_pernet_subsys(&inet6_net_ops);
1241 register_pernet_fail:
1242 #ifdef CONFIG_SYSCTL
1243         ipv6_static_sysctl_unregister();
1244 static_sysctl_fail:
1245 #endif
1246         sock_unregister(PF_INET6);
1247         rtnl_unregister_all(PF_INET6);
1248 out_sock_register_fail:
1249         rawv6_exit();
1250 out_unregister_raw_proto:
1251         proto_unregister(&rawv6_prot);
1252 out_unregister_udplite_proto:
1253         proto_unregister(&udplitev6_prot);
1254 out_unregister_udp_proto:
1255         proto_unregister(&udpv6_prot);
1256 out_unregister_tcp_proto:
1257         proto_unregister(&tcpv6_prot);
1258         goto out;
1259 }
1260 module_init(inet6_init);
1261
1262 static void __exit inet6_exit(void)
1263 {
1264         if (disable_ipv6_mod)
1265                 return;
1266
1267         /* First of all disallow new sockets creation. */
1268         sock_unregister(PF_INET6);
1269         /* Disallow any further netlink messages */
1270         rtnl_unregister_all(PF_INET6);
1271
1272 #ifdef CONFIG_SYSCTL
1273         ipv6_sysctl_unregister();
1274 #endif
1275         udpv6_exit();
1276         udplitev6_exit();
1277         tcpv6_exit();
1278
1279         /* Cleanup code parts. */
1280         ipv6_packet_cleanup();
1281         ipv6_frag_exit();
1282         ipv6_exthdrs_exit();
1283         addrconf_cleanup();
1284         ip6_flowlabel_cleanup();
1285         ip6_route_cleanup();
1286 #ifdef CONFIG_PROC_FS
1287
1288         /* Cleanup code parts. */
1289         if6_proc_exit();
1290         ipv6_misc_proc_exit();
1291         udplite6_proc_exit();
1292         raw6_proc_exit();
1293 #endif
1294         ipv6_netfilter_fini();
1295         igmp6_cleanup();
1296         ndisc_cleanup();
1297         ip6_mr_cleanup();
1298         icmpv6_cleanup();
1299         rawv6_exit();
1300
1301         unregister_pernet_subsys(&inet6_net_ops);
1302 #ifdef CONFIG_SYSCTL
1303         ipv6_static_sysctl_unregister();
1304 #endif
1305         proto_unregister(&rawv6_prot);
1306         proto_unregister(&udplitev6_prot);
1307         proto_unregister(&udpv6_prot);
1308         proto_unregister(&tcpv6_prot);
1309
1310         rcu_barrier(); /* Wait for completion of call_rcu()'s */
1311 }
1312 module_exit(inet6_exit);
1313
1314 MODULE_ALIAS_NETPROTO(PF_INET6);