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 (protocol < 0 || protocol >= IPPROTO_MAX)
 113                 return -EINVAL;
 114
 115         if (sock->type != SOCK_RAW &&
 116             sock->type != SOCK_DGRAM &&
 117             !inet_ehash_secret)
 118                 build_ehash_secret();
 119
 120         /* Look for the requested type/protocol pair. */
 121 lookup_protocol:
 122         err = -ESOCKTNOSUPPORT;
 123         rcu_read_lock();
 124         list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
 125
 126                 err = 0;
 127                 /* Check the non-wild match. */
 128                 if (protocol == answer->protocol) {
 129                         if (protocol != IPPROTO_IP)
 130                                 break;
 131                 } else {
 132                         /* Check for the two wild cases. */
 133                         if (IPPROTO_IP == protocol) {
 134                                 protocol = answer->protocol;
 135                                 break;
 136                         }
 137                         if (IPPROTO_IP == answer->protocol)
 138                                 break;
 139                 }
 140                 err = -EPROTONOSUPPORT;
 141         }
 142
 143         if (err) {
 144                 if (try_loading_module < 2) {
 145                         rcu_read_unlock();
 146                         /*
 147                          * Be more specific, e.g. net-pf-10-proto-132-type-1
 148                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
 149                          */
 150                         if (++try_loading_module == 1)
 151                                 request_module("net-pf-%d-proto-%d-type-%d",
 152                                                 PF_INET6, protocol, sock->type);
 153                         /*
 154                          * Fall back to generic, e.g. net-pf-10-proto-132
 155                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
 156                          */
 157                         else
 158                                 request_module("net-pf-%d-proto-%d",
 159                                                 PF_INET6, protocol);
 160                         goto lookup_protocol;
 161                 } else
 162                         goto out_rcu_unlock;
 163         }
 164
 165         err = -EPERM;
 166         if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
 167                 goto out_rcu_unlock;
 168
 169         sock->ops = answer->ops;
 170         answer_prot = answer->prot;
 171         answer_no_check = answer->no_check;
 172         answer_flags = answer->flags;
 173         rcu_read_unlock();
 174
 175         WARN_ON(answer_prot->slab == NULL);
 176
 177         err = -ENOBUFS;
 178         sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot);
 179         if (sk == NULL)
 180                 goto out;
 181
 182         sock_init_data(sock, sk);
 183
 184         err = 0;
 185         sk->sk_no_check = answer_no_check;
 186         if (INET_PROTOSW_REUSE & answer_flags)
 187                 sk->sk_reuse = 1;
 188
 189         inet = inet_sk(sk);
 190         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
 191
 192         if (SOCK_RAW == sock->type) {
 193                 inet->inet_num = protocol;
 194                 if (IPPROTO_RAW == protocol)
 195                         inet->hdrincl = 1;
 196         }
 197
 198         sk->sk_destruct         = inet_sock_destruct;
 199         sk->sk_family           = PF_INET6;
 200         sk->sk_protocol         = protocol;
 201
 202         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
 203
 204         inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
 205         np->hop_limit   = -1;
 206         np->mcast_hops  = IPV6_DEFAULT_MCASTHOPS;
 207         np->mc_loop     = 1;
 208         np->pmtudisc    = IPV6_PMTUDISC_WANT;
 209         np->ipv6only    = net->ipv6.sysctl.bindv6only;
 210
 211         /* Init the ipv4 part of the socket since we can have sockets
 212          * using v6 API for ipv4.
 213          */
 214         inet->uc_ttl    = -1;
 215
 216         inet->mc_loop   = 1;
 217         inet->mc_ttl    = 1;
 218         inet->mc_index  = 0;
 219         inet->mc_list   = NULL;
 220
 221         if (ipv4_config.no_pmtu_disc)
 222                 inet->pmtudisc = IP_PMTUDISC_DONT;
 223         else
 224                 inet->pmtudisc = IP_PMTUDISC_WANT;
 225         /*
 226          * Increment only the relevant sk_prot->socks debug field, this changes
 227          * the previous behaviour of incrementing both the equivalent to
 228          * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
 229          *
 230          * This allows better debug granularity as we'll know exactly how many
 231          * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
 232          * transport protocol socks. -acme
 233          */
 234         sk_refcnt_debug_inc(sk);
 235
 236         if (inet->inet_num) {
 237                 /* It assumes that any protocol which allows
 238                  * the user to assign a number at socket
 239                  * creation time automatically shares.
 240                  */
 241                 inet->inet_sport = htons(inet->inet_num);
 242                 sk->sk_prot->hash(sk);
 243         }
 244         if (sk->sk_prot->init) {
 245                 err = sk->sk_prot->init(sk);
 246                 if (err) {
 247                         sk_common_release(sk);
 248                         goto out;
 249                 }
 250         }
 251 out:
 252         return err;
 253 out_rcu_unlock:
 254         rcu_read_unlock();
 255         goto out;
 256 }
 257
 258
 259 /* bind for INET6 API */
 260 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 261 {
 262         struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
 263         struct sock *sk = sock->sk;
 264         struct inet_sock *inet = inet_sk(sk);
 265         struct ipv6_pinfo *np = inet6_sk(sk);
 266         struct net *net = sock_net(sk);
 267         __be32 v4addr = 0;
 268         unsigned short snum;
 269         int addr_type = 0;
 270         int err = 0;
 271
 272         /* If the socket has its own bind function then use it. */
 273         if (sk->sk_prot->bind)
 274                 return sk->sk_prot->bind(sk, uaddr, addr_len);
 275
 276         if (addr_len < SIN6_LEN_RFC2133)
 277                 return -EINVAL;
 278
 279         if (addr->sin6_family != AF_INET6)
 280                 return -EAFNOSUPPORT;
 281
 282         addr_type = ipv6_addr_type(&addr->sin6_addr);
 283         if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
 284                 return -EINVAL;
 285
 286         snum = ntohs(addr->sin6_port);
 287         if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
 288                 return -EACCES;
 289
 290         lock_sock(sk);
 291
 292         /* Check these errors (active socket, double bind). */
 293         if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
 294                 err = -EINVAL;
 295                 goto out;
 296         }
 297
 298         /* Check if the address belongs to the host. */
 299         if (addr_type == IPV6_ADDR_MAPPED) {
 300                 int chk_addr_ret;
 301
 302                 /* Binding to v4-mapped address on a v6-only socket
 303                  * makes no sense
 304                  */
 305                 if (np->ipv6only) {
 306                         err = -EINVAL;
 307                         goto out;
 308                 }
 309
 310                 /* Reproduce AF_INET checks to make the bindings consistent */
 311                 v4addr = addr->sin6_addr.s6_addr32[3];
 312                 chk_addr_ret = inet_addr_type(net, v4addr);
 313                 if (!sysctl_ip_nonlocal_bind &&
 314                     !(inet->freebind || inet->transparent) &&
 315                     v4addr != htonl(INADDR_ANY) &&
 316                     chk_addr_ret != RTN_LOCAL &&
 317                     chk_addr_ret != RTN_MULTICAST &&
 318                     chk_addr_ret != RTN_BROADCAST) {
 319                         err = -EADDRNOTAVAIL;
 320                         goto out;
 321                 }
 322         } else {
 323                 if (addr_type != IPV6_ADDR_ANY) {
 324                         struct net_device *dev = NULL;
 325
 326                         rcu_read_lock();
 327                         if (addr_type & IPV6_ADDR_LINKLOCAL) {
 328                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 329                                     addr->sin6_scope_id) {
 330                                         /* Override any existing binding, if another one
 331                                          * is supplied by user.
 332                                          */
 333                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
 334                                 }
 335
 336                                 /* Binding to link-local address requires an interface */
 337                                 if (!sk->sk_bound_dev_if) {
 338                                         err = -EINVAL;
 339                                         goto out_unlock;
 340                                 }
 341                                 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
 342                                 if (!dev) {
 343                                         err = -ENODEV;
 344                                         goto out_unlock;
 345                                 }
 346                         }
 347
 348                         /* ipv4 addr of the socket is invalid.  Only the
 349                          * unspecified and mapped address have a v4 equivalent.
 350                          */
 351                         v4addr = LOOPBACK4_IPV6;
 352                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
 353                                 if (!inet->transparent &&
 354                                     !ipv6_chk_addr(net, &addr->sin6_addr,
 355                                                    dev, 0)) {
 356                                         err = -EADDRNOTAVAIL;
 357                                         goto out_unlock;
 358                                 }
 359                         }
 360                         rcu_read_unlock();
 361                 }
 362         }
 363
 364         inet->inet_rcv_saddr = v4addr;
 365         inet->inet_saddr = v4addr;
 366
 367         ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
 368
 369         if (!(addr_type & IPV6_ADDR_MULTICAST))
 370                 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
 371
 372         /* Make sure we are allowed to bind here. */
 373         if (sk->sk_prot->get_port(sk, snum)) {
 374                 inet_reset_saddr(sk);
 375                 err = -EADDRINUSE;
 376                 goto out;
 377         }
 378
 379         if (addr_type != IPV6_ADDR_ANY) {
 380                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
 381                 if (addr_type != IPV6_ADDR_MAPPED)
 382                         np->ipv6only = 1;
 383         }
 384         if (snum)
 385                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
 386         inet->inet_sport = htons(inet->inet_num);
 387         inet->inet_dport = 0;
 388         inet->inet_daddr = 0;
 389 out:
 390         release_sock(sk);
 391         return err;
 392 out_unlock:
 393         rcu_read_unlock();
 394         goto out;
 395 }
 396
 397 EXPORT_SYMBOL(inet6_bind);
 398
 399 int inet6_release(struct socket *sock)
 400 {
 401         struct sock *sk = sock->sk;
 402
 403         if (sk == NULL)
 404                 return -EINVAL;
 405
 406         /* Free mc lists */
 407         ipv6_sock_mc_close(sk);
 408
 409         /* Free ac lists */
 410         ipv6_sock_ac_close(sk);
 411
 412         return inet_release(sock);
 413 }
 414
 415 EXPORT_SYMBOL(inet6_release);
 416
 417 void inet6_destroy_sock(struct sock *sk)
 418 {
 419         struct ipv6_pinfo *np = inet6_sk(sk);
 420         struct sk_buff *skb;
 421         struct ipv6_txoptions *opt;
 422
 423         /* Release rx options */
 424
 425         if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
 426                 kfree_skb(skb);
 427
 428         if ((skb = xchg(&np->rxpmtu, NULL)) != NULL)
 429                 kfree_skb(skb);
 430
 431         /* Free flowlabels */
 432         fl6_free_socklist(sk);
 433
 434         /* Free tx options */
 435
 436         opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL);
 437         if (opt) {
 438                 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 439                 txopt_put(opt);
 440         }
 441 }
 442
 443 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
 444
 445 /*
 446  *      This does both peername and sockname.
 447  */
 448
 449 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 450                  int *uaddr_len, int peer)
 451 {
 452         struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
 453         struct sock *sk = sock->sk;
 454         struct inet_sock *inet = inet_sk(sk);
 455         struct ipv6_pinfo *np = inet6_sk(sk);
 456
 457         sin->sin6_family = AF_INET6;
 458         sin->sin6_flowinfo = 0;
 459         sin->sin6_scope_id = 0;
 460         if (peer) {
 461                 if (!inet->inet_dport)
 462                         return -ENOTCONN;
 463                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
 464                     peer == 1)
 465                         return -ENOTCONN;
 466                 sin->sin6_port = inet->inet_dport;
 467                 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
 468                 if (np->sndflow)
 469                         sin->sin6_flowinfo = np->flow_label;
 470         } else {
 471                 if (ipv6_addr_any(&np->rcv_saddr))
 472                         ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
 473                 else
 474                         ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
 475
 476                 sin->sin6_port = inet->inet_sport;
 477         }
 478         if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
 479                 sin->sin6_scope_id = sk->sk_bound_dev_if;
 480         *uaddr_len = sizeof(*sin);
 481         return 0;
 482 }
 483
 484 EXPORT_SYMBOL(inet6_getname);
 485
 486 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 487 {
 488         struct sock *sk = sock->sk;
 489         struct net *net = sock_net(sk);
 490
 491         switch(cmd)
 492         {
 493         case SIOCGSTAMP:
 494                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
 495
 496         case SIOCGSTAMPNS:
 497                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
 498
 499         case SIOCADDRT:
 500         case SIOCDELRT:
 501
 502                 return ipv6_route_ioctl(net, cmd, (void __user *)arg);
 503
 504         case SIOCSIFADDR:
 505                 return addrconf_add_ifaddr(net, (void __user *) arg);
 506         case SIOCDIFADDR:
 507                 return addrconf_del_ifaddr(net, (void __user *) arg);
 508         case SIOCSIFDSTADDR:
 509                 return addrconf_set_dstaddr(net, (void __user *) arg);
 510         default:
 511                 if (!sk->sk_prot->ioctl)
 512                         return -ENOIOCTLCMD;
 513                 return sk->sk_prot->ioctl(sk, cmd, arg);
 514         }
 515         /*NOTREACHED*/
 516         return 0;
 517 }
 518
 519 EXPORT_SYMBOL(inet6_ioctl);
 520
 521 const struct proto_ops inet6_stream_ops = {
 522         .family            = PF_INET6,
 523         .owner             = THIS_MODULE,
 524         .release           = inet6_release,
 525         .bind              = inet6_bind,
 526         .connect           = inet_stream_connect,       /* ok           */
 527         .socketpair        = sock_no_socketpair,        /* a do nothing */
 528         .accept            = inet_accept,               /* ok           */
 529         .getname           = inet6_getname,
 530         .poll              = tcp_poll,                  /* ok           */
 531         .ioctl             = inet6_ioctl,               /* must change  */
 532         .listen            = inet_listen,               /* ok           */
 533         .shutdown          = inet_shutdown,             /* ok           */
 534         .setsockopt        = sock_common_setsockopt,    /* ok           */
 535         .getsockopt        = sock_common_getsockopt,    /* ok           */
 536         .sendmsg           = inet_sendmsg,              /* ok           */
 537         .recvmsg           = inet_recvmsg,              /* ok           */
 538         .mmap              = sock_no_mmap,
 539         .sendpage          = inet_sendpage,
 540         .splice_read       = tcp_splice_read,
 541 #ifdef CONFIG_COMPAT
 542         .compat_setsockopt = compat_sock_common_setsockopt,
 543         .compat_getsockopt = compat_sock_common_getsockopt,
 544 #endif
 545 };
 546
 547 const struct proto_ops inet6_dgram_ops = {
 548         .family            = PF_INET6,
 549         .owner             = THIS_MODULE,
 550         .release           = inet6_release,
 551         .bind              = inet6_bind,
 552         .connect           = inet_dgram_connect,        /* ok           */
 553         .socketpair        = sock_no_socketpair,        /* a do nothing */
 554         .accept            = sock_no_accept,            /* a do nothing */
 555         .getname           = inet6_getname,
 556         .poll              = udp_poll,                  /* ok           */
 557         .ioctl             = inet6_ioctl,               /* must change  */
 558         .listen            = sock_no_listen,            /* ok           */
 559         .shutdown          = inet_shutdown,             /* ok           */
 560         .setsockopt        = sock_common_setsockopt,    /* ok           */
 561         .getsockopt        = sock_common_getsockopt,    /* ok           */
 562         .sendmsg           = inet_sendmsg,              /* ok           */
 563         .recvmsg           = inet_recvmsg,              /* ok           */
 564         .mmap              = sock_no_mmap,
 565         .sendpage          = sock_no_sendpage,
 566 #ifdef CONFIG_COMPAT
 567         .compat_setsockopt = compat_sock_common_setsockopt,
 568         .compat_getsockopt = compat_sock_common_getsockopt,
 569 #endif
 570 };
 571
 572 static const struct net_proto_family inet6_family_ops = {
 573         .family = PF_INET6,
 574         .create = inet6_create,
 575         .owner  = THIS_MODULE,
 576 };
 577
 578 int inet6_register_protosw(struct inet_protosw *p)
 579 {
 580         struct list_head *lh;
 581         struct inet_protosw *answer;
 582         struct list_head *last_perm;
 583         int protocol = p->protocol;
 584         int ret;
 585
 586         spin_lock_bh(&inetsw6_lock);
 587
 588         ret = -EINVAL;
 589         if (p->type >= SOCK_MAX)
 590                 goto out_illegal;
 591
 592         /* If we are trying to override a permanent protocol, bail. */
 593         answer = NULL;
 594         ret = -EPERM;
 595         last_perm = &inetsw6[p->type];
 596         list_for_each(lh, &inetsw6[p->type]) {
 597                 answer = list_entry(lh, struct inet_protosw, list);
 598
 599                 /* Check only the non-wild match. */
 600                 if (INET_PROTOSW_PERMANENT & answer->flags) {
 601                         if (protocol == answer->protocol)
 602                                 break;
 603                         last_perm = lh;
 604                 }
 605
 606                 answer = NULL;
 607         }
 608         if (answer)
 609                 goto out_permanent;
 610
 611         /* Add the new entry after the last permanent entry if any, so that
 612          * the new entry does not override a permanent entry when matched with
 613          * a wild-card protocol. But it is allowed to override any existing
 614          * non-permanent entry.  This means that when we remove this entry, the
 615          * system automatically returns to the old behavior.
 616          */
 617         list_add_rcu(&p->list, last_perm);
 618         ret = 0;
 619 out:
 620         spin_unlock_bh(&inetsw6_lock);
 621         return ret;
 622
 623 out_permanent:
 624         printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
 625                protocol);
 626         goto out;
 627
 628 out_illegal:
 629         printk(KERN_ERR
 630                "Ignoring attempt to register invalid socket type %d.\n",
 631                p->type);
 632         goto out;
 633 }
 634
 635 EXPORT_SYMBOL(inet6_register_protosw);
 636
 637 void
 638 inet6_unregister_protosw(struct inet_protosw *p)
 639 {
 640         if (INET_PROTOSW_PERMANENT & p->flags) {
 641                 printk(KERN_ERR
 642                        "Attempt to unregister permanent protocol %d.\n",
 643                        p->protocol);
 644         } else {
 645                 spin_lock_bh(&inetsw6_lock);
 646                 list_del_rcu(&p->list);
 647                 spin_unlock_bh(&inetsw6_lock);
 648
 649                 synchronize_net();
 650         }
 651 }
 652
 653 EXPORT_SYMBOL(inet6_unregister_protosw);
 654
 655 int inet6_sk_rebuild_header(struct sock *sk)
 656 {
 657         struct ipv6_pinfo *np = inet6_sk(sk);
 658         struct dst_entry *dst;
 659
 660         dst = __sk_dst_check(sk, np->dst_cookie);
 661
 662         if (dst == NULL) {
 663                 struct inet_sock *inet = inet_sk(sk);
 664                 struct in6_addr *final_p, final;
 665                 struct flowi6 fl6;
 666
 667                 memset(&fl6, 0, sizeof(fl6));
 668                 fl6.flowi6_proto = sk->sk_protocol;
 669                 ipv6_addr_copy(&fl6.daddr, &np->daddr);
 670                 ipv6_addr_copy(&fl6.saddr, &np->saddr);
 671                 fl6.flowlabel = np->flow_label;
 672                 fl6.flowi6_oif = sk->sk_bound_dev_if;
 673                 fl6.flowi6_mark = sk->sk_mark;
 674                 fl6.fl6_dport = inet->inet_dport;
 675                 fl6.fl6_sport = inet->inet_sport;
 676                 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
 677
 678                 rcu_read_lock();
 679                 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt),
 680                                          &final);
 681                 rcu_read_unlock();
 682
 683                 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
 684                 if (IS_ERR(dst)) {
 685                         sk->sk_route_caps = 0;
 686                         sk->sk_err_soft = -PTR_ERR(dst);
 687                         return PTR_ERR(dst);
 688                 }
 689
 690                 __ip6_dst_store(sk, dst, NULL, NULL);
 691         }
 692
 693         return 0;
 694 }
 695
 696 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
 697
 698 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
 699 {
 700         struct ipv6_pinfo *np = inet6_sk(sk);
 701         struct inet6_skb_parm *opt = IP6CB(skb);
 702
 703         if (np->rxopt.all) {
 704                 if ((opt->hop && (np->rxopt.bits.hopopts ||
 705                                   np->rxopt.bits.ohopopts)) ||
 706                     ((IPV6_FLOWINFO_MASK &
 707                       *(__be32 *)skb_network_header(skb)) &&
 708                      np->rxopt.bits.rxflow) ||
 709                     (opt->srcrt && (np->rxopt.bits.srcrt ||
 710                      np->rxopt.bits.osrcrt)) ||
 711                     ((opt->dst1 || opt->dst0) &&
 712                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
 713                         return 1;
 714         }
 715         return 0;
 716 }
 717
 718 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
 719
 720 static int ipv6_gso_pull_exthdrs(struct sk_buff *skb, int proto)
 721 {
 722         const struct inet6_protocol *ops = NULL;
 723
 724         for (;;) {
 725                 struct ipv6_opt_hdr *opth;
 726                 int len;
 727
 728                 if (proto != NEXTHDR_HOP) {
 729                         ops = rcu_dereference(inet6_protos[proto]);
 730
 731                         if (unlikely(!ops))
 732                                 break;
 733
 734                         if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
 735                                 break;
 736                 }
 737
 738                 if (unlikely(!pskb_may_pull(skb, 8)))
 739                         break;
 740
 741                 opth = (void *)skb->data;
 742                 len = ipv6_optlen(opth);
 743
 744                 if (unlikely(!pskb_may_pull(skb, len)))
 745                         break;
 746
 747                 proto = opth->nexthdr;
 748                 __skb_pull(skb, len);
 749         }
 750
 751         return proto;
 752 }
 753
 754 static int ipv6_gso_send_check(struct sk_buff *skb)
 755 {
 756         const struct ipv6hdr *ipv6h;
 757         const struct inet6_protocol *ops;
 758         int err = -EINVAL;
 759
 760         if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
 761                 goto out;
 762
 763         ipv6h = ipv6_hdr(skb);
 764         __skb_pull(skb, sizeof(*ipv6h));
 765         err = -EPROTONOSUPPORT;
 766
 767         rcu_read_lock();
 768         ops = rcu_dereference(inet6_protos[
 769                 ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]);
 770
 771         if (likely(ops && ops->gso_send_check)) {
 772                 skb_reset_transport_header(skb);
 773                 err = ops->gso_send_check(skb);
 774         }
 775         rcu_read_unlock();
 776
 777 out:
 778         return err;
 779 }
 780
 781 static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, u32 features)
 782 {
 783         struct sk_buff *segs = ERR_PTR(-EINVAL);
 784         struct ipv6hdr *ipv6h;
 785         const struct inet6_protocol *ops;
 786         int proto;
 787         struct frag_hdr *fptr;
 788         unsigned int unfrag_ip6hlen;
 789         u8 *prevhdr;
 790         int offset = 0;
 791
 792         if (!(features & NETIF_F_V6_CSUM))
 793                 features &= ~NETIF_F_SG;
 794
 795         if (unlikely(skb_shinfo(skb)->gso_type &
 796                      ~(SKB_GSO_UDP |
 797                        SKB_GSO_DODGY |
 798                        SKB_GSO_TCP_ECN |
 799                        SKB_GSO_TCPV6 |
 800                        0)))
 801                 goto out;
 802
 803         if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
 804                 goto out;
 805
 806         ipv6h = ipv6_hdr(skb);
 807         __skb_pull(skb, sizeof(*ipv6h));
 808         segs = ERR_PTR(-EPROTONOSUPPORT);
 809
 810         proto = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
 811         rcu_read_lock();
 812         ops = rcu_dereference(inet6_protos[proto]);
 813         if (likely(ops && ops->gso_segment)) {
 814                 skb_reset_transport_header(skb);
 815                 segs = ops->gso_segment(skb, features);
 816         }
 817         rcu_read_unlock();
 818
 819         if (IS_ERR(segs))
 820                 goto out;
 821
 822         for (skb = segs; skb; skb = skb->next) {
 823                 ipv6h = ipv6_hdr(skb);
 824                 ipv6h->payload_len = htons(skb->len - skb->mac_len -
 825                                            sizeof(*ipv6h));
 826                 if (proto == IPPROTO_UDP) {
 827                         unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
 828                         fptr = (struct frag_hdr *)(skb_network_header(skb) +
 829                                 unfrag_ip6hlen);
 830                         fptr->frag_off = htons(offset);
 831                         if (skb->next != NULL)
 832                                 fptr->frag_off |= htons(IP6_MF);
 833                         offset += (ntohs(ipv6h->payload_len) -
 834                                    sizeof(struct frag_hdr));
 835                 }
 836         }
 837
 838 out:
 839         return segs;
 840 }
 841
 842 struct ipv6_gro_cb {
 843         struct napi_gro_cb napi;
 844         int proto;
 845 };
 846
 847 #define IPV6_GRO_CB(skb) ((struct ipv6_gro_cb *)(skb)->cb)
 848
 849 static struct sk_buff **ipv6_gro_receive(struct sk_buff **head,
 850                                          struct sk_buff *skb)
 851 {
 852         const struct inet6_protocol *ops;
 853         struct sk_buff **pp = NULL;
 854         struct sk_buff *p;
 855         struct ipv6hdr *iph;
 856         unsigned int nlen;
 857         unsigned int hlen;
 858         unsigned int off;
 859         int flush = 1;
 860         int proto;
 861         __wsum csum;
 862
 863         off = skb_gro_offset(skb);
 864         hlen = off + sizeof(*iph);
 865         iph = skb_gro_header_fast(skb, off);
 866         if (skb_gro_header_hard(skb, hlen)) {
 867                 iph = skb_gro_header_slow(skb, hlen, off);
 868                 if (unlikely(!iph))
 869                         goto out;
 870         }
 871
 872         skb_gro_pull(skb, sizeof(*iph));
 873         skb_set_transport_header(skb, skb_gro_offset(skb));
 874
 875         flush += ntohs(iph->payload_len) != skb_gro_len(skb);
 876
 877         rcu_read_lock();
 878         proto = iph->nexthdr;
 879         ops = rcu_dereference(inet6_protos[proto]);
 880         if (!ops || !ops->gro_receive) {
 881                 __pskb_pull(skb, skb_gro_offset(skb));
 882                 proto = ipv6_gso_pull_exthdrs(skb, proto);
 883                 skb_gro_pull(skb, -skb_transport_offset(skb));
 884                 skb_reset_transport_header(skb);
 885                 __skb_push(skb, skb_gro_offset(skb));
 886
 887                 ops = rcu_dereference(inet6_protos[proto]);
 888                 if (!ops || !ops->gro_receive)
 889                         goto out_unlock;
 890
 891                 iph = ipv6_hdr(skb);
 892         }
 893
 894         IPV6_GRO_CB(skb)->proto = proto;
 895
 896         flush--;
 897         nlen = skb_network_header_len(skb);
 898
 899         for (p = *head; p; p = p->next) {
 900                 struct ipv6hdr *iph2;
 901
 902                 if (!NAPI_GRO_CB(p)->same_flow)
 903                         continue;
 904
 905                 iph2 = ipv6_hdr(p);
 906
 907                 /* All fields must match except length. */
 908                 if (nlen != skb_network_header_len(p) ||
 909                     memcmp(iph, iph2, offsetof(struct ipv6hdr, payload_len)) ||
 910                     memcmp(&iph->nexthdr, &iph2->nexthdr,
 911                            nlen - offsetof(struct ipv6hdr, nexthdr))) {
 912                         NAPI_GRO_CB(p)->same_flow = 0;
 913                         continue;
 914                 }
 915
 916                 NAPI_GRO_CB(p)->flush |= flush;
 917         }
 918
 919         NAPI_GRO_CB(skb)->flush |= flush;
 920
 921         csum = skb->csum;
 922         skb_postpull_rcsum(skb, iph, skb_network_header_len(skb));
 923
 924         pp = ops->gro_receive(head, skb);
 925
 926         skb->csum = csum;
 927
 928 out_unlock:
 929         rcu_read_unlock();
 930
 931 out:
 932         NAPI_GRO_CB(skb)->flush |= flush;
 933
 934         return pp;
 935 }
 936
 937 static int ipv6_gro_complete(struct sk_buff *skb)
 938 {
 939         const struct inet6_protocol *ops;
 940         struct ipv6hdr *iph = ipv6_hdr(skb);
 941         int err = -ENOSYS;
 942
 943         iph->payload_len = htons(skb->len - skb_network_offset(skb) -
 944                                  sizeof(*iph));
 945
 946         rcu_read_lock();
 947         ops = rcu_dereference(inet6_protos[IPV6_GRO_CB(skb)->proto]);
 948         if (WARN_ON(!ops || !ops->gro_complete))
 949                 goto out_unlock;
 950
 951         err = ops->gro_complete(skb);
 952
 953 out_unlock:
 954         rcu_read_unlock();
 955
 956         return err;
 957 }
 958
 959 static struct packet_type ipv6_packet_type __read_mostly = {
 960         .type = cpu_to_be16(ETH_P_IPV6),
 961         .func = ipv6_rcv,
 962         .gso_send_check = ipv6_gso_send_check,
 963         .gso_segment = ipv6_gso_segment,
 964         .gro_receive = ipv6_gro_receive,
 965         .gro_complete = ipv6_gro_complete,
 966 };
 967
 968 static int __init ipv6_packet_init(void)
 969 {
 970         dev_add_pack(&ipv6_packet_type);
 971         return 0;
 972 }
 973
 974 static void ipv6_packet_cleanup(void)
 975 {
 976         dev_remove_pack(&ipv6_packet_type);
 977 }
 978
 979 static int __net_init ipv6_init_mibs(struct net *net)
 980 {
 981         if (snmp_mib_init((void __percpu **)net->mib.udp_stats_in6,
 982                           sizeof(struct udp_mib),
 983                           __alignof__(struct udp_mib)) < 0)
 984                 return -ENOMEM;
 985         if (snmp_mib_init((void __percpu **)net->mib.udplite_stats_in6,
 986                           sizeof(struct udp_mib),
 987                           __alignof__(struct udp_mib)) < 0)
 988                 goto err_udplite_mib;
 989         if (snmp_mib_init((void __percpu **)net->mib.ipv6_statistics,
 990                           sizeof(struct ipstats_mib),
 991                           __alignof__(struct ipstats_mib)) < 0)
 992                 goto err_ip_mib;
 993         if (snmp_mib_init((void __percpu **)net->mib.icmpv6_statistics,
 994                           sizeof(struct icmpv6_mib),
 995                           __alignof__(struct icmpv6_mib)) < 0)
 996                 goto err_icmp_mib;
 997         if (snmp_mib_init((void __percpu **)net->mib.icmpv6msg_statistics,
 998                           sizeof(struct icmpv6msg_mib),
 999                           __alignof__(struct icmpv6msg_mib)) < 0)
1000                 goto err_icmpmsg_mib;
1001         return 0;
1002
1003 err_icmpmsg_mib:
1004         snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics);
1005 err_icmp_mib:
1006         snmp_mib_free((void __percpu **)net->mib.ipv6_statistics);
1007 err_ip_mib:
1008         snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6);
1009 err_udplite_mib:
1010         snmp_mib_free((void __percpu **)net->mib.udp_stats_in6);
1011         return -ENOMEM;
1012 }
1013
1014 static void ipv6_cleanup_mibs(struct net *net)
1015 {
1016         snmp_mib_free((void __percpu **)net->mib.udp_stats_in6);
1017         snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6);
1018         snmp_mib_free((void __percpu **)net->mib.ipv6_statistics);
1019         snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics);
1020         snmp_mib_free((void __percpu **)net->mib.icmpv6msg_statistics);
1021 }
1022
1023 static int __net_init inet6_net_init(struct net *net)
1024 {
1025         int err = 0;
1026
1027         net->ipv6.sysctl.bindv6only = 0;
1028         net->ipv6.sysctl.icmpv6_time = 1*HZ;
1029
1030         err = ipv6_init_mibs(net);
1031         if (err)
1032                 return err;
1033 #ifdef CONFIG_PROC_FS
1034         err = udp6_proc_init(net);
1035         if (err)
1036                 goto out;
1037         err = tcp6_proc_init(net);
1038         if (err)
1039                 goto proc_tcp6_fail;
1040         err = ac6_proc_init(net);
1041         if (err)
1042                 goto proc_ac6_fail;
1043 #endif
1044         return err;
1045
1046 #ifdef CONFIG_PROC_FS
1047 proc_ac6_fail:
1048         tcp6_proc_exit(net);
1049 proc_tcp6_fail:
1050         udp6_proc_exit(net);
1051 out:
1052         ipv6_cleanup_mibs(net);
1053         return err;
1054 #endif
1055 }
1056
1057 static void __net_exit inet6_net_exit(struct net *net)
1058 {
1059 #ifdef CONFIG_PROC_FS
1060         udp6_proc_exit(net);
1061         tcp6_proc_exit(net);
1062         ac6_proc_exit(net);
1063 #endif
1064         ipv6_cleanup_mibs(net);
1065 }
1066
1067 static struct pernet_operations inet6_net_ops = {
1068         .init = inet6_net_init,
1069         .exit = inet6_net_exit,
1070 };
1071
1072 static int __init inet6_init(void)
1073 {
1074         struct sk_buff *dummy_skb;
1075         struct list_head *r;
1076         int err = 0;
1077
1078         BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
1079
1080         /* Register the socket-side information for inet6_create.  */
1081         for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
1082                 INIT_LIST_HEAD(r);
1083
1084         if (disable_ipv6_mod) {
1085                 printk(KERN_INFO
1086                        "IPv6: Loaded, but administratively disabled, "
1087                        "reboot required to enable\n");
1088                 goto out;
1089         }
1090
1091         err = proto_register(&tcpv6_prot, 1);
1092         if (err)
1093                 goto out;
1094
1095         err = proto_register(&udpv6_prot, 1);
1096         if (err)
1097                 goto out_unregister_tcp_proto;
1098
1099         err = proto_register(&udplitev6_prot, 1);
1100         if (err)
1101                 goto out_unregister_udp_proto;
1102
1103         err = proto_register(&rawv6_prot, 1);
1104         if (err)
1105                 goto out_unregister_udplite_proto;
1106
1107
1108         /* We MUST register RAW sockets before we create the ICMP6,
1109          * IGMP6, or NDISC control sockets.
1110          */
1111         err = rawv6_init();
1112         if (err)
1113                 goto out_unregister_raw_proto;
1114
1115         /* Register the family here so that the init calls below will
1116          * be able to create sockets. (?? is this dangerous ??)
1117          */
1118         err = sock_register(&inet6_family_ops);
1119         if (err)
1120                 goto out_sock_register_fail;
1121
1122 #ifdef CONFIG_SYSCTL
1123         err = ipv6_static_sysctl_register();
1124         if (err)
1125                 goto static_sysctl_fail;
1126 #endif
1127         /*
1128          *      ipngwg API draft makes clear that the correct semantics
1129          *      for TCP and UDP is to consider one TCP and UDP instance
1130          *      in a host available by both INET and INET6 APIs and
1131          *      able to communicate via both network protocols.
1132          */
1133
1134         err = register_pernet_subsys(&inet6_net_ops);
1135         if (err)
1136                 goto register_pernet_fail;
1137         err = icmpv6_init();
1138         if (err)
1139                 goto icmp_fail;
1140         err = ip6_mr_init();
1141         if (err)
1142                 goto ipmr_fail;
1143         err = ndisc_init();
1144         if (err)
1145                 goto ndisc_fail;
1146         err = igmp6_init();
1147         if (err)
1148                 goto igmp_fail;
1149         err = ipv6_netfilter_init();
1150         if (err)
1151                 goto netfilter_fail;
1152         /* Create /proc/foo6 entries. */
1153 #ifdef CONFIG_PROC_FS
1154         err = -ENOMEM;
1155         if (raw6_proc_init())
1156                 goto proc_raw6_fail;
1157         if (udplite6_proc_init())
1158                 goto proc_udplite6_fail;
1159         if (ipv6_misc_proc_init())
1160                 goto proc_misc6_fail;
1161         if (if6_proc_init())
1162                 goto proc_if6_fail;
1163 #endif
1164         err = ip6_route_init();
1165         if (err)
1166                 goto ip6_route_fail;
1167         err = ip6_flowlabel_init();
1168         if (err)
1169                 goto ip6_flowlabel_fail;
1170         err = addrconf_init();
1171         if (err)
1172                 goto addrconf_fail;
1173
1174         /* Init v6 extension headers. */
1175         err = ipv6_exthdrs_init();
1176         if (err)
1177                 goto ipv6_exthdrs_fail;
1178
1179         err = ipv6_frag_init();
1180         if (err)
1181                 goto ipv6_frag_fail;
1182
1183         /* Init v6 transport protocols. */
1184         err = udpv6_init();
1185         if (err)
1186                 goto udpv6_fail;
1187
1188         err = udplitev6_init();
1189         if (err)
1190                 goto udplitev6_fail;
1191
1192         err = tcpv6_init();
1193         if (err)
1194                 goto tcpv6_fail;
1195
1196         err = ipv6_packet_init();
1197         if (err)
1198                 goto ipv6_packet_fail;
1199
1200 #ifdef CONFIG_SYSCTL
1201         err = ipv6_sysctl_register();
1202         if (err)
1203                 goto sysctl_fail;
1204 #endif
1205 out:
1206         return err;
1207
1208 #ifdef CONFIG_SYSCTL
1209 sysctl_fail:
1210         ipv6_packet_cleanup();
1211 #endif
1212 ipv6_packet_fail:
1213         tcpv6_exit();
1214 tcpv6_fail:
1215         udplitev6_exit();
1216 udplitev6_fail:
1217         udpv6_exit();
1218 udpv6_fail:
1219         ipv6_frag_exit();
1220 ipv6_frag_fail:
1221         ipv6_exthdrs_exit();
1222 ipv6_exthdrs_fail:
1223         addrconf_cleanup();
1224 addrconf_fail:
1225         ip6_flowlabel_cleanup();
1226 ip6_flowlabel_fail:
1227         ip6_route_cleanup();
1228 ip6_route_fail:
1229 #ifdef CONFIG_PROC_FS
1230         if6_proc_exit();
1231 proc_if6_fail:
1232         ipv6_misc_proc_exit();
1233 proc_misc6_fail:
1234         udplite6_proc_exit();
1235 proc_udplite6_fail:
1236         raw6_proc_exit();
1237 proc_raw6_fail:
1238 #endif
1239         ipv6_netfilter_fini();
1240 netfilter_fail:
1241         igmp6_cleanup();
1242 igmp_fail:
1243         ndisc_cleanup();
1244 ndisc_fail:
1245         ip6_mr_cleanup();
1246 ipmr_fail:
1247         icmpv6_cleanup();
1248 icmp_fail:
1249         unregister_pernet_subsys(&inet6_net_ops);
1250 register_pernet_fail:
1251 #ifdef CONFIG_SYSCTL
1252         ipv6_static_sysctl_unregister();
1253 static_sysctl_fail:
1254 #endif
1255         sock_unregister(PF_INET6);
1256         rtnl_unregister_all(PF_INET6);
1257 out_sock_register_fail:
1258         rawv6_exit();
1259 out_unregister_raw_proto:
1260         proto_unregister(&rawv6_prot);
1261 out_unregister_udplite_proto:
1262         proto_unregister(&udplitev6_prot);
1263 out_unregister_udp_proto:
1264         proto_unregister(&udpv6_prot);
1265 out_unregister_tcp_proto:
1266         proto_unregister(&tcpv6_prot);
1267         goto out;
1268 }
1269 module_init(inet6_init);
1270
1271 static void __exit inet6_exit(void)
1272 {
1273         if (disable_ipv6_mod)
1274                 return;
1275
1276         /* First of all disallow new sockets creation. */
1277         sock_unregister(PF_INET6);
1278         /* Disallow any further netlink messages */
1279         rtnl_unregister_all(PF_INET6);
1280
1281 #ifdef CONFIG_SYSCTL
1282         ipv6_sysctl_unregister();
1283 #endif
1284         udpv6_exit();
1285         udplitev6_exit();
1286         tcpv6_exit();
1287
1288         /* Cleanup code parts. */
1289         ipv6_packet_cleanup();
1290         ipv6_frag_exit();
1291         ipv6_exthdrs_exit();
1292         addrconf_cleanup();
1293         ip6_flowlabel_cleanup();
1294         ip6_route_cleanup();
1295 #ifdef CONFIG_PROC_FS
1296
1297         /* Cleanup code parts. */
1298         if6_proc_exit();
1299         ipv6_misc_proc_exit();
1300         udplite6_proc_exit();
1301         raw6_proc_exit();
1302 #endif
1303         ipv6_netfilter_fini();
1304         igmp6_cleanup();
1305         ndisc_cleanup();
1306         ip6_mr_cleanup();
1307         icmpv6_cleanup();
1308         rawv6_exit();
1309
1310         unregister_pernet_subsys(&inet6_net_ops);
1311 #ifdef CONFIG_SYSCTL
1312         ipv6_static_sysctl_unregister();
1313 #endif
1314         proto_unregister(&rawv6_prot);
1315         proto_unregister(&udplitev6_prot);
1316         proto_unregister(&udpv6_prot);
1317         proto_unregister(&tcpv6_prot);
1318
1319         rcu_barrier(); /* Wait for completion of call_rcu()'s */
1320 }
1321 module_exit(inet6_exit);
1322
1323 MODULE_ALIAS_NETPROTO(PF_INET6);