release/src-rt-6.x/linux/linux-2.6/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  *      $Id: af_inet6.c,v 1.66 2002/02/01 22:01:04 davem Exp $
  11  *
  12  *      Fixes:
  13  *      piggy, Karl Knutson     :       Socket protocol table
  14  *      Hideaki YOSHIFUJI       :       sin6_scope_id support
  15  *      Arnaldo Melo            :       check proc_net_create return, cleanups
  16  *
  17  *      This program is free software; you can redistribute it and/or
  18  *      modify it under the terms of the GNU General Public License
  19  *      as published by the Free Software Foundation; either version
  20  *      2 of the License, or (at your option) any later version.
  21  */
  22
  23
  24 #include <linux/module.h>
  25 #include <linux/capability.h>
  26 #include <linux/errno.h>
  27 #include <linux/types.h>
  28 #include <linux/socket.h>
  29 #include <linux/in.h>
  30 #include <linux/kernel.h>
  31 #include <linux/timer.h>
  32 #include <linux/string.h>
  33 #include <linux/sockios.h>
  34 #include <linux/net.h>
  35 #include <linux/fcntl.h>
  36 #include <linux/mm.h>
  37 #include <linux/interrupt.h>
  38 #include <linux/proc_fs.h>
  39 #include <linux/stat.h>
  40 #include <linux/init.h>
  41
  42 #include <linux/inet.h>
  43 #include <linux/netdevice.h>
  44 #include <linux/icmpv6.h>
  45 #include <linux/netfilter_ipv6.h>
  46
  47 #include <net/ip.h>
  48 #include <net/ipv6.h>
  49 #include <net/udp.h>
  50 #include <net/udplite.h>
  51 #include <net/tcp.h>
  52 #include <net/ipip.h>
  53 #include <net/protocol.h>
  54 #include <net/inet_common.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 #ifdef CONFIG_IPV6_MIP6
  62 #include <net/mip6.h>
  63 #endif
  64
  65 #include <asm/uaccess.h>
  66 #include <asm/system.h>
  67 #ifdef CONFIG_IPV6_MROUTE
  68 #include <linux/mroute6.h>
  69 #endif
  70
  71 MODULE_AUTHOR("Cast of dozens");
  72 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
  73 MODULE_LICENSE("GPL");
  74
  75 int sysctl_ipv6_bindv6only __read_mostly;
  76
  77 /* The inetsw table contains everything that inet_create needs to
  78  * build a new socket.
  79  */
  80 static struct list_head inetsw6[SOCK_MAX];
  81 static DEFINE_SPINLOCK(inetsw6_lock);
  82
  83 struct ipv6_params ipv6_defaults = {
  84         .disable_ipv6 = 0,
  85         .autoconf = 1,
  86 };
  87
  88 static int disable_ipv6_mod = 0;
  89
  90 module_param_named(disable, disable_ipv6_mod, int, 0444);
  91 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
  92
  93 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
  94 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
  95
  96 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
  97 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
  98
  99 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
 100 {
 101         const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
 102
 103         return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
 104 }
 105
 106 static int inet6_create(struct socket *sock, int protocol)
 107 {
 108         struct inet_sock *inet;
 109         struct ipv6_pinfo *np;
 110         struct sock *sk;
 111         struct list_head *p;
 112         struct inet_protosw *answer;
 113         struct proto *answer_prot;
 114         unsigned char answer_flags;
 115         char answer_no_check;
 116         int try_loading_module = 0;
 117         int err;
 118
 119         if (sock->type != SOCK_RAW &&
 120             sock->type != SOCK_DGRAM &&
 121             !inet_ehash_secret)
 122                 build_ehash_secret();
 123
 124         /* Look for the requested type/protocol pair. */
 125         answer = NULL;
 126 lookup_protocol:
 127         err = -ESOCKTNOSUPPORT;
 128         rcu_read_lock();
 129         list_for_each_rcu(p, &inetsw6[sock->type]) {
 130                 answer = list_entry(p, struct inet_protosw, list);
 131
 132                 /* Check the non-wild match. */
 133                 if (protocol == answer->protocol) {
 134                         if (protocol != IPPROTO_IP)
 135                                 break;
 136                 } else {
 137                         /* Check for the two wild cases. */
 138                         if (IPPROTO_IP == protocol) {
 139                                 protocol = answer->protocol;
 140                                 break;
 141                         }
 142                         if (IPPROTO_IP == answer->protocol)
 143                                 break;
 144                 }
 145                 err = -EPROTONOSUPPORT;
 146                 answer = NULL;
 147         }
 148
 149         if (!answer) {
 150                 if (try_loading_module < 2) {
 151                         rcu_read_unlock();
 152                         /*
 153                          * Be more specific, e.g. net-pf-10-proto-132-type-1
 154                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
 155                          */
 156                         if (++try_loading_module == 1)
 157                                 request_module("net-pf-%d-proto-%d-type-%d",
 158                                                 PF_INET6, protocol, sock->type);
 159                         /*
 160                          * Fall back to generic, e.g. net-pf-10-proto-132
 161                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
 162                          */
 163                         else
 164                                 request_module("net-pf-%d-proto-%d",
 165                                                 PF_INET6, protocol);
 166                         goto lookup_protocol;
 167                 } else
 168                         goto out_rcu_unlock;
 169         }
 170
 171         err = -EPERM;
 172         if (answer->capability > 0 && !capable(answer->capability))
 173                 goto out_rcu_unlock;
 174
 175         sock->ops = answer->ops;
 176         answer_prot = answer->prot;
 177         answer_no_check = answer->no_check;
 178         answer_flags = answer->flags;
 179         rcu_read_unlock();
 180
 181         BUG_TRAP(answer_prot->slab != NULL);
 182
 183         err = -ENOBUFS;
 184         sk = sk_alloc(PF_INET6, GFP_KERNEL, answer_prot, 1);
 185         if (sk == NULL)
 186                 goto out;
 187
 188         sock_init_data(sock, sk);
 189
 190         err = 0;
 191         sk->sk_no_check = answer_no_check;
 192         if (INET_PROTOSW_REUSE & answer_flags)
 193                 sk->sk_reuse = 1;
 194
 195         inet = inet_sk(sk);
 196         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
 197
 198         if (SOCK_RAW == sock->type) {
 199                 inet->num = protocol;
 200                 if (IPPROTO_RAW == protocol)
 201                         inet->hdrincl = 1;
 202         }
 203
 204         sk->sk_destruct         = inet_sock_destruct;
 205         sk->sk_family           = PF_INET6;
 206         sk->sk_protocol         = protocol;
 207
 208         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
 209
 210         inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
 211         np->hop_limit   = -1;
 212         np->mcast_hops  = -1;
 213         np->mc_loop     = 1;
 214         np->pmtudisc    = IPV6_PMTUDISC_WANT;
 215         np->ipv6only    = sysctl_ipv6_bindv6only;
 216
 217         /* Init the ipv4 part of the socket since we can have sockets
 218          * using v6 API for ipv4.
 219          */
 220         inet->uc_ttl    = -1;
 221
 222         inet->mc_loop   = 1;
 223         inet->mc_ttl    = 1;
 224         inet->mc_index  = 0;
 225         inet->mc_list   = NULL;
 226
 227         if (ipv4_config.no_pmtu_disc)
 228                 inet->pmtudisc = IP_PMTUDISC_DONT;
 229         else
 230                 inet->pmtudisc = IP_PMTUDISC_WANT;
 231         /*
 232          * Increment only the relevant sk_prot->socks debug field, this changes
 233          * the previous behaviour of incrementing both the equivalent to
 234          * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
 235          *
 236          * This allows better debug granularity as we'll know exactly how many
 237          * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
 238          * transport protocol socks. -acme
 239          */
 240         sk_refcnt_debug_inc(sk);
 241
 242         if (inet->num) {
 243                 /* It assumes that any protocol which allows
 244                  * the user to assign a number at socket
 245                  * creation time automatically shares.
 246                  */
 247                 inet->sport = htons(inet->num);
 248                 sk->sk_prot->hash(sk);
 249         }
 250         if (sk->sk_prot->init) {
 251                 err = sk->sk_prot->init(sk);
 252                 if (err) {
 253                         sk_common_release(sk);
 254                         goto out;
 255                 }
 256         }
 257 out:
 258         return err;
 259 out_rcu_unlock:
 260         rcu_read_unlock();
 261         goto out;
 262 }
 263
 264
 265 /* bind for INET6 API */
 266 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 267 {
 268         struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
 269         struct sock *sk = sock->sk;
 270         struct inet_sock *inet = inet_sk(sk);
 271         struct ipv6_pinfo *np = inet6_sk(sk);
 272         __be32 v4addr = 0;
 273         unsigned short snum;
 274         int addr_type = 0;
 275         int err = 0;
 276
 277         /* If the socket has its own bind function then use it. */
 278         if (sk->sk_prot->bind)
 279                 return sk->sk_prot->bind(sk, uaddr, addr_len);
 280
 281         if (addr_len < SIN6_LEN_RFC2133)
 282                 return -EINVAL;
 283         addr_type = ipv6_addr_type(&addr->sin6_addr);
 284         if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
 285                 return -EINVAL;
 286
 287         snum = ntohs(addr->sin6_port);
 288         if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
 289                 return -EACCES;
 290
 291         lock_sock(sk);
 292
 293         /* Check these errors (active socket, double bind). */
 294         if (sk->sk_state != TCP_CLOSE || inet->num) {
 295                 err = -EINVAL;
 296                 goto out;
 297         }
 298
 299         /* Check if the address belongs to the host. */
 300         if (addr_type == IPV6_ADDR_MAPPED) {
 301                 v4addr = addr->sin6_addr.s6_addr32[3];
 302                 if (inet_addr_type(v4addr) != RTN_LOCAL) {
 303                         err = -EADDRNOTAVAIL;
 304                         goto out;
 305                 }
 306         } else {
 307                 if (addr_type != IPV6_ADDR_ANY) {
 308                         struct net_device *dev = NULL;
 309
 310                         if (addr_type & IPV6_ADDR_LINKLOCAL) {
 311                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 312                                     addr->sin6_scope_id) {
 313                                         /* Override any existing binding, if another one
 314                                          * is supplied by user.
 315                                          */
 316                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
 317                                 }
 318
 319                                 /* Binding to link-local address requires an interface */
 320                                 if (!sk->sk_bound_dev_if) {
 321                                         err = -EINVAL;
 322                                         goto out;
 323                                 }
 324                                 dev = dev_get_by_index(sk->sk_bound_dev_if);
 325                                 if (!dev) {
 326                                         err = -ENODEV;
 327                                         goto out;
 328                                 }
 329                         }
 330
 331                         /* ipv4 addr of the socket is invalid.  Only the
 332                          * unspecified and mapped address have a v4 equivalent.
 333                          */
 334                         v4addr = LOOPBACK4_IPV6;
 335                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
 336                                 if (!ipv6_chk_addr(&addr->sin6_addr, dev, 0)) {
 337                                         if (dev)
 338                                                 dev_put(dev);
 339                                         err = -EADDRNOTAVAIL;
 340                                         goto out;
 341                                 }
 342                         }
 343                         if (dev)
 344                                 dev_put(dev);
 345                 }
 346         }
 347
 348         inet->rcv_saddr = v4addr;
 349         inet->saddr = v4addr;
 350
 351         ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
 352
 353         if (!(addr_type & IPV6_ADDR_MULTICAST))
 354                 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
 355
 356         /* Make sure we are allowed to bind here. */
 357         if (sk->sk_prot->get_port(sk, snum)) {
 358                 inet_reset_saddr(sk);
 359                 err = -EADDRINUSE;
 360                 goto out;
 361         }
 362
 363         if (addr_type != IPV6_ADDR_ANY) {
 364                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
 365                 if (addr_type != IPV6_ADDR_MAPPED)
 366                         np->ipv6only = 1;
 367         }
 368         if (snum)
 369                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
 370         inet->sport = htons(inet->num);
 371         inet->dport = 0;
 372         inet->daddr = 0;
 373 out:
 374         release_sock(sk);
 375         return err;
 376 }
 377
 378 EXPORT_SYMBOL(inet6_bind);
 379
 380 int inet6_release(struct socket *sock)
 381 {
 382         struct sock *sk = sock->sk;
 383
 384         if (sk == NULL)
 385                 return -EINVAL;
 386
 387         /* Free mc lists */
 388         ipv6_sock_mc_close(sk);
 389
 390         /* Free ac lists */
 391         ipv6_sock_ac_close(sk);
 392
 393         return inet_release(sock);
 394 }
 395
 396 EXPORT_SYMBOL(inet6_release);
 397
 398 int inet6_destroy_sock(struct sock *sk)
 399 {
 400         struct ipv6_pinfo *np = inet6_sk(sk);
 401         struct sk_buff *skb;
 402         struct ipv6_txoptions *opt;
 403
 404         /* Release rx options */
 405
 406         if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
 407                 kfree_skb(skb);
 408
 409         /* Free flowlabels */
 410         fl6_free_socklist(sk);
 411
 412         /* Free tx options */
 413
 414         if ((opt = xchg(&np->opt, NULL)) != NULL)
 415                 sock_kfree_s(sk, opt, opt->tot_len);
 416
 417         return 0;
 418 }
 419
 420 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
 421
 422 /*
 423  *      This does both peername and sockname.
 424  */
 425
 426 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 427                  int *uaddr_len, int peer)
 428 {
 429         struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
 430         struct sock *sk = sock->sk;
 431         struct inet_sock *inet = inet_sk(sk);
 432         struct ipv6_pinfo *np = inet6_sk(sk);
 433
 434         sin->sin6_family = AF_INET6;
 435         sin->sin6_flowinfo = 0;
 436         sin->sin6_scope_id = 0;
 437         if (peer) {
 438                 if (!inet->dport)
 439                         return -ENOTCONN;
 440                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
 441                     peer == 1)
 442                         return -ENOTCONN;
 443                 sin->sin6_port = inet->dport;
 444                 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
 445                 if (np->sndflow)
 446                         sin->sin6_flowinfo = np->flow_label;
 447         } else {
 448                 if (ipv6_addr_any(&np->rcv_saddr))
 449                         ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
 450                 else
 451                         ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
 452
 453                 sin->sin6_port = inet->sport;
 454         }
 455         if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
 456                 sin->sin6_scope_id = sk->sk_bound_dev_if;
 457         *uaddr_len = sizeof(*sin);
 458         return(0);
 459 }
 460
 461 EXPORT_SYMBOL(inet6_getname);
 462
 463 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 464 {
 465         struct sock *sk = sock->sk;
 466
 467         switch(cmd)
 468         {
 469         case SIOCGSTAMP:
 470                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
 471
 472         case SIOCGSTAMPNS:
 473                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
 474
 475         case SIOCADDRT:
 476         case SIOCDELRT:
 477
 478                 return(ipv6_route_ioctl(cmd,(void __user *)arg));
 479
 480         case SIOCSIFADDR:
 481                 return addrconf_add_ifaddr((void __user *) arg);
 482         case SIOCDIFADDR:
 483                 return addrconf_del_ifaddr((void __user *) arg);
 484         case SIOCSIFDSTADDR:
 485                 return addrconf_set_dstaddr((void __user *) arg);
 486         default:
 487                 if (!sk->sk_prot->ioctl)
 488                         return -ENOIOCTLCMD;
 489                 return sk->sk_prot->ioctl(sk, cmd, arg);
 490         }
 491         /*NOTREACHED*/
 492         return(0);
 493 }
 494
 495 EXPORT_SYMBOL(inet6_ioctl);
 496
 497 const struct proto_ops inet6_stream_ops = {
 498         .family            = PF_INET6,
 499         .owner             = THIS_MODULE,
 500         .release           = inet6_release,
 501         .bind              = inet6_bind,
 502         .connect           = inet_stream_connect,       /* ok           */
 503         .socketpair        = sock_no_socketpair,        /* a do nothing */
 504         .accept            = inet_accept,               /* ok           */
 505         .getname           = inet6_getname,
 506         .poll              = tcp_poll,                  /* ok           */
 507         .ioctl             = inet6_ioctl,               /* must change  */
 508         .listen            = inet_listen,               /* ok           */
 509         .shutdown          = inet_shutdown,             /* ok           */
 510         .setsockopt        = sock_common_setsockopt,    /* ok           */
 511         .getsockopt        = sock_common_getsockopt,    /* ok           */
 512         .sendmsg           = tcp_sendmsg,               /* ok           */
 513         .recvmsg           = sock_common_recvmsg,       /* ok           */
 514         .mmap              = sock_no_mmap,
 515         .sendpage          = tcp_sendpage,
 516 #ifdef CONFIG_COMPAT
 517         .compat_setsockopt = compat_sock_common_setsockopt,
 518         .compat_getsockopt = compat_sock_common_getsockopt,
 519 #endif
 520 };
 521
 522 const struct proto_ops inet6_dgram_ops = {
 523         .family            = PF_INET6,
 524         .owner             = THIS_MODULE,
 525         .release           = inet6_release,
 526         .bind              = inet6_bind,
 527         .connect           = inet_dgram_connect,        /* ok           */
 528         .socketpair        = sock_no_socketpair,        /* a do nothing */
 529         .accept            = sock_no_accept,            /* a do nothing */
 530         .getname           = inet6_getname,
 531         .poll              = udp_poll,                  /* ok           */
 532         .ioctl             = inet6_ioctl,               /* must change  */
 533         .listen            = sock_no_listen,            /* ok           */
 534         .shutdown          = inet_shutdown,             /* ok           */
 535         .setsockopt        = sock_common_setsockopt,    /* ok           */
 536         .getsockopt        = sock_common_getsockopt,    /* ok           */
 537         .sendmsg           = inet_sendmsg,              /* ok           */
 538         .recvmsg           = sock_common_recvmsg,       /* ok           */
 539         .mmap              = sock_no_mmap,
 540         .sendpage          = sock_no_sendpage,
 541 #ifdef CONFIG_COMPAT
 542         .compat_setsockopt = compat_sock_common_setsockopt,
 543         .compat_getsockopt = compat_sock_common_getsockopt,
 544 #endif
 545 };
 546
 547 static struct net_proto_family inet6_family_ops = {
 548         .family = PF_INET6,
 549         .create = inet6_create,
 550         .owner  = THIS_MODULE,
 551 };
 552
 553 /* Same as inet6_dgram_ops, sans udp_poll.  */
 554 static const struct proto_ops inet6_sockraw_ops = {
 555         .family            = PF_INET6,
 556         .owner             = THIS_MODULE,
 557         .release           = inet6_release,
 558         .bind              = inet6_bind,
 559         .connect           = inet_dgram_connect,        /* ok           */
 560         .socketpair        = sock_no_socketpair,        /* a do nothing */
 561         .accept            = sock_no_accept,            /* a do nothing */
 562         .getname           = inet6_getname,
 563         .poll              = datagram_poll,             /* ok           */
 564         .ioctl             = inet6_ioctl,               /* must change  */
 565         .listen            = sock_no_listen,            /* ok           */
 566         .shutdown          = inet_shutdown,             /* ok           */
 567         .setsockopt        = sock_common_setsockopt,    /* ok           */
 568         .getsockopt        = sock_common_getsockopt,    /* ok           */
 569         .sendmsg           = inet_sendmsg,              /* ok           */
 570         .recvmsg           = sock_common_recvmsg,       /* ok           */
 571         .mmap              = sock_no_mmap,
 572         .sendpage          = sock_no_sendpage,
 573 #ifdef CONFIG_COMPAT
 574         .compat_setsockopt = compat_sock_common_setsockopt,
 575         .compat_getsockopt = compat_sock_common_getsockopt,
 576 #endif
 577 };
 578
 579 static struct inet_protosw rawv6_protosw = {
 580         .type           = SOCK_RAW,
 581         .protocol       = IPPROTO_IP,   /* wild card */
 582         .prot           = &rawv6_prot,
 583         .ops            = &inet6_sockraw_ops,
 584         .capability     = CAP_NET_RAW,
 585         .no_check       = UDP_CSUM_DEFAULT,
 586         .flags          = INET_PROTOSW_REUSE,
 587 };
 588
 589 void
 590 inet6_register_protosw(struct inet_protosw *p)
 591 {
 592         struct list_head *lh;
 593         struct inet_protosw *answer;
 594         int protocol = p->protocol;
 595         struct list_head *last_perm;
 596
 597         spin_lock_bh(&inetsw6_lock);
 598
 599         if (p->type >= SOCK_MAX)
 600                 goto out_illegal;
 601
 602         /* If we are trying to override a permanent protocol, bail. */
 603         answer = NULL;
 604         last_perm = &inetsw6[p->type];
 605         list_for_each(lh, &inetsw6[p->type]) {
 606                 answer = list_entry(lh, struct inet_protosw, list);
 607
 608                 /* Check only the non-wild match. */
 609                 if (INET_PROTOSW_PERMANENT & answer->flags) {
 610                         if (protocol == answer->protocol)
 611                                 break;
 612                         last_perm = lh;
 613                 }
 614
 615                 answer = NULL;
 616         }
 617         if (answer)
 618                 goto out_permanent;
 619
 620         /* Add the new entry after the last permanent entry if any, so that
 621          * the new entry does not override a permanent entry when matched with
 622          * a wild-card protocol. But it is allowed to override any existing
 623          * non-permanent entry.  This means that when we remove this entry, the
 624          * system automatically returns to the old behavior.
 625          */
 626         list_add_rcu(&p->list, last_perm);
 627 out:
 628         spin_unlock_bh(&inetsw6_lock);
 629         return;
 630
 631 out_permanent:
 632         printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
 633                protocol);
 634         goto out;
 635
 636 out_illegal:
 637         printk(KERN_ERR
 638                "Ignoring attempt to register invalid socket type %d.\n",
 639                p->type);
 640         goto out;
 641 }
 642
 643 EXPORT_SYMBOL(inet6_register_protosw);
 644
 645 void
 646 inet6_unregister_protosw(struct inet_protosw *p)
 647 {
 648         if (INET_PROTOSW_PERMANENT & p->flags) {
 649                 printk(KERN_ERR
 650                        "Attempt to unregister permanent protocol %d.\n",
 651                        p->protocol);
 652         } else {
 653                 spin_lock_bh(&inetsw6_lock);
 654                 list_del_rcu(&p->list);
 655                 spin_unlock_bh(&inetsw6_lock);
 656
 657                 synchronize_net();
 658         }
 659 }
 660
 661 EXPORT_SYMBOL(inet6_unregister_protosw);
 662
 663 int inet6_sk_rebuild_header(struct sock *sk)
 664 {
 665         int err;
 666         struct dst_entry *dst;
 667         struct ipv6_pinfo *np = inet6_sk(sk);
 668
 669         dst = __sk_dst_check(sk, np->dst_cookie);
 670
 671         if (dst == NULL) {
 672                 struct inet_sock *inet = inet_sk(sk);
 673                 struct in6_addr *final_p = NULL, final;
 674                 struct flowi fl;
 675
 676                 memset(&fl, 0, sizeof(fl));
 677                 fl.proto = sk->sk_protocol;
 678                 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 679                 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
 680                 fl.fl6_flowlabel = np->flow_label;
 681                 fl.oif = sk->sk_bound_dev_if;
 682                 fl.fl_ip_dport = inet->dport;
 683                 fl.fl_ip_sport = inet->sport;
 684                 security_sk_classify_flow(sk, &fl);
 685
 686                 if (np->opt && np->opt->srcrt) {
 687                         struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
 688                         ipv6_addr_copy(&final, &fl.fl6_dst);
 689                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 690                         final_p = &final;
 691                 }
 692
 693                 err = ip6_dst_lookup(sk, &dst, &fl);
 694                 if (err) {
 695                         sk->sk_route_caps = 0;
 696                         return err;
 697                 }
 698                 if (final_p)
 699                         ipv6_addr_copy(&fl.fl6_dst, final_p);
 700
 701                 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
 702                         sk->sk_err_soft = -err;
 703                         return err;
 704                 }
 705
 706                 __ip6_dst_store(sk, dst, NULL, NULL);
 707         }
 708
 709         return 0;
 710 }
 711
 712 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
 713
 714 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
 715 {
 716         struct ipv6_pinfo *np = inet6_sk(sk);
 717         struct inet6_skb_parm *opt = IP6CB(skb);
 718
 719         if (np->rxopt.all) {
 720                 if ((opt->hop && (np->rxopt.bits.hopopts ||
 721                                   np->rxopt.bits.ohopopts)) ||
 722                     ((IPV6_FLOWINFO_MASK &
 723                       *(__be32 *)skb_network_header(skb)) &&
 724                      np->rxopt.bits.rxflow) ||
 725                     (opt->srcrt && (np->rxopt.bits.srcrt ||
 726                      np->rxopt.bits.osrcrt)) ||
 727                     ((opt->dst1 || opt->dst0) &&
 728                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
 729                         return 1;
 730         }
 731         return 0;
 732 }
 733
 734 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
 735
 736 static int __init init_ipv6_mibs(void)
 737 {
 738         if (snmp_mib_init((void **)ipv6_statistics, sizeof (struct ipstats_mib),
 739                           __alignof__(struct ipstats_mib)) < 0)
 740                 goto err_ip_mib;
 741         if (snmp_mib_init((void **)icmpv6_statistics, sizeof (struct icmpv6_mib),
 742                           __alignof__(struct icmpv6_mib)) < 0)
 743                 goto err_icmp_mib;
 744         if (snmp_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib),
 745                           __alignof__(struct udp_mib)) < 0)
 746                 goto err_udp_mib;
 747         if (snmp_mib_init((void **)udplite_stats_in6, sizeof (struct udp_mib),
 748                           __alignof__(struct udp_mib)) < 0)
 749                 goto err_udplite_mib;
 750         return 0;
 751
 752 err_udplite_mib:
 753         snmp_mib_free((void **)udp_stats_in6);
 754 err_udp_mib:
 755         snmp_mib_free((void **)icmpv6_statistics);
 756 err_icmp_mib:
 757         snmp_mib_free((void **)ipv6_statistics);
 758 err_ip_mib:
 759         return -ENOMEM;
 760
 761 }
 762
 763 static void cleanup_ipv6_mibs(void)
 764 {
 765         snmp_mib_free((void **)ipv6_statistics);
 766         snmp_mib_free((void **)icmpv6_statistics);
 767         snmp_mib_free((void **)udp_stats_in6);
 768         snmp_mib_free((void **)udplite_stats_in6);
 769 }
 770
 771 static int __init inet6_init(void)
 772 {
 773         struct sk_buff *dummy_skb;
 774         struct list_head *r;
 775         int err = 0;
 776
 777         BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
 778
 779 #ifdef MODULE
 780 #if 0 /* FIXME --RR */
 781         if (!mod_member_present(&__this_module, can_unload))
 782           return -EINVAL;
 783
 784         __this_module.can_unload = &ipv6_unload;
 785 #endif
 786 #endif
 787
 788         /* Register the socket-side information for inet6_create.  */
 789         for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
 790                 INIT_LIST_HEAD(r);
 791
 792         if (disable_ipv6_mod) {
 793                 printk(KERN_INFO
 794                        "IPv6: Loaded, but administratively disabled, "
 795                        "reboot required to enable\n");
 796                 goto out;
 797         }
 798
 799         err = proto_register(&tcpv6_prot, 1);
 800         if (err)
 801                 goto out;
 802
 803         err = proto_register(&udpv6_prot, 1);
 804         if (err)
 805                 goto out_unregister_tcp_proto;
 806
 807         err = proto_register(&udplitev6_prot, 1);
 808         if (err)
 809                 goto out_unregister_udp_proto;
 810
 811         err = proto_register(&rawv6_prot, 1);
 812         if (err)
 813                 goto out_unregister_udplite_proto;
 814
 815
 816         /* We MUST register RAW sockets before we create the ICMP6,
 817          * IGMP6, or NDISC control sockets.
 818          */
 819         inet6_register_protosw(&rawv6_protosw);
 820
 821         /* Register the family here so that the init calls below will
 822          * be able to create sockets. (?? is this dangerous ??)
 823          */
 824         err = sock_register(&inet6_family_ops);
 825         if (err)
 826                 goto out_unregister_raw_proto;
 827
 828         /* Initialise ipv6 mibs */
 829         err = init_ipv6_mibs();
 830         if (err)
 831                 goto out_unregister_sock;
 832
 833         /*
 834          *      ipngwg API draft makes clear that the correct semantics
 835          *      for TCP and UDP is to consider one TCP and UDP instance
 836          *      in a host availiable by both INET and INET6 APIs and
 837          *      able to communicate via both network protocols.
 838          */
 839
 840 #ifdef CONFIG_SYSCTL
 841         ipv6_sysctl_register();
 842 #endif
 843         err = icmpv6_init(&inet6_family_ops);
 844         if (err)
 845                 goto icmp_fail;
 846 #ifdef CONFIG_IPV6_MROUTE
 847         ip6_mr_init();
 848 #endif
 849         err = ndisc_init(&inet6_family_ops);
 850         if (err)
 851                 goto ndisc_fail;
 852         err = igmp6_init(&inet6_family_ops);
 853         if (err)
 854                 goto igmp_fail;
 855         err = ipv6_netfilter_init();
 856         if (err)
 857                 goto netfilter_fail;
 858         /* Create /proc/foo6 entries. */
 859 #ifdef CONFIG_PROC_FS
 860         err = -ENOMEM;
 861         if (raw6_proc_init())
 862                 goto proc_raw6_fail;
 863         if (tcp6_proc_init())
 864                 goto proc_tcp6_fail;
 865         if (udp6_proc_init())
 866                 goto proc_udp6_fail;
 867         if (udplite6_proc_init())
 868                 goto proc_udplite6_fail;
 869         if (ipv6_misc_proc_init())
 870                 goto proc_misc6_fail;
 871
 872         if (ac6_proc_init())
 873                 goto proc_anycast6_fail;
 874         if (if6_proc_init())
 875                 goto proc_if6_fail;
 876 #endif
 877         ip6_route_init();
 878         ip6_flowlabel_init();
 879         err = addrconf_init();
 880         if (err)
 881                 goto addrconf_fail;
 882
 883         /* Init v6 extension headers. */
 884         ipv6_rthdr_init();
 885         ipv6_frag_init();
 886         ipv6_nodata_init();
 887         ipv6_destopt_init();
 888 #ifdef CONFIG_IPV6_MIP6
 889         mip6_init();
 890 #endif
 891
 892         /* Init v6 transport protocols. */
 893         udpv6_init();
 894         udplitev6_init();
 895         tcpv6_init();
 896
 897         ipv6_packet_init();
 898         err = 0;
 899 out:
 900         return err;
 901
 902 addrconf_fail:
 903         ip6_flowlabel_cleanup();
 904         ip6_route_cleanup();
 905 #ifdef CONFIG_PROC_FS
 906         if6_proc_exit();
 907 proc_if6_fail:
 908         ac6_proc_exit();
 909 proc_anycast6_fail:
 910         ipv6_misc_proc_exit();
 911 proc_misc6_fail:
 912         udplite6_proc_exit();
 913 proc_udplite6_fail:
 914         udp6_proc_exit();
 915 proc_udp6_fail:
 916         tcp6_proc_exit();
 917 proc_tcp6_fail:
 918         raw6_proc_exit();
 919 proc_raw6_fail:
 920 #endif
 921         ipv6_netfilter_fini();
 922 netfilter_fail:
 923         igmp6_cleanup();
 924 igmp_fail:
 925         ndisc_cleanup();
 926 ndisc_fail:
 927         icmpv6_cleanup();
 928 icmp_fail:
 929 #ifdef CONFIG_SYSCTL
 930         ipv6_sysctl_unregister();
 931 #endif
 932         cleanup_ipv6_mibs();
 933 out_unregister_sock:
 934         sock_unregister(PF_INET6);
 935 out_unregister_raw_proto:
 936         proto_unregister(&rawv6_prot);
 937 out_unregister_udplite_proto:
 938         proto_unregister(&udplitev6_prot);
 939 out_unregister_udp_proto:
 940         proto_unregister(&udpv6_prot);
 941 out_unregister_tcp_proto:
 942         proto_unregister(&tcpv6_prot);
 943         goto out;
 944 }
 945 module_init(inet6_init);
 946
 947 static void __exit inet6_exit(void)
 948 {
 949         if (disable_ipv6_mod)
 950                 return;
 951
 952         /* First of all disallow new sockets creation. */
 953         sock_unregister(PF_INET6);
 954         /* Disallow any further netlink messages */
 955         rtnl_unregister_all(PF_INET6);
 956
 957         /* Cleanup code parts. */
 958         ipv6_packet_cleanup();
 959 #ifdef CONFIG_IPV6_MIP6
 960         mip6_fini();
 961 #endif
 962         addrconf_cleanup();
 963         ip6_flowlabel_cleanup();
 964         ip6_route_cleanup();
 965 #ifdef CONFIG_PROC_FS
 966
 967         /* Cleanup code parts. */
 968         if6_proc_exit();
 969         ac6_proc_exit();
 970         ipv6_misc_proc_exit();
 971         udplite6_proc_exit();
 972         udp6_proc_exit();
 973         tcp6_proc_exit();
 974         raw6_proc_exit();
 975 #endif
 976         ipv6_netfilter_fini();
 977         igmp6_cleanup();
 978         ndisc_cleanup();
 979         icmpv6_cleanup();
 980 #ifdef CONFIG_SYSCTL
 981         ipv6_sysctl_unregister();
 982 #endif
 983         cleanup_ipv6_mibs();
 984         proto_unregister(&rawv6_prot);
 985         proto_unregister(&udplitev6_prot);
 986         proto_unregister(&udpv6_prot);
 987         proto_unregister(&tcpv6_prot);
 988 }
 989 module_exit(inet6_exit);
 990
 991 MODULE_ALIAS_NETPROTO(PF_INET6);