release/src-rt/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 (snum)
 366                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
 367         inet->sport = htons(inet->num);
 368         inet->dport = 0;
 369         inet->daddr = 0;
 370 out:
 371         release_sock(sk);
 372         return err;
 373 }
 374
 375 EXPORT_SYMBOL(inet6_bind);
 376
 377 int inet6_release(struct socket *sock)
 378 {
 379         struct sock *sk = sock->sk;
 380
 381         if (sk == NULL)
 382                 return -EINVAL;
 383
 384         /* Free mc lists */
 385         ipv6_sock_mc_close(sk);
 386
 387         /* Free ac lists */
 388         ipv6_sock_ac_close(sk);
 389
 390         return inet_release(sock);
 391 }
 392
 393 EXPORT_SYMBOL(inet6_release);
 394
 395 int inet6_destroy_sock(struct sock *sk)
 396 {
 397         struct ipv6_pinfo *np = inet6_sk(sk);
 398         struct sk_buff *skb;
 399         struct ipv6_txoptions *opt;
 400
 401         /* Release rx options */
 402
 403         if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
 404                 kfree_skb(skb);
 405
 406         /* Free flowlabels */
 407         fl6_free_socklist(sk);
 408
 409         /* Free tx options */
 410
 411         if ((opt = xchg(&np->opt, NULL)) != NULL)
 412                 sock_kfree_s(sk, opt, opt->tot_len);
 413
 414         return 0;
 415 }
 416
 417 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
 418
 419 /*
 420  *      This does both peername and sockname.
 421  */
 422
 423 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 424                  int *uaddr_len, int peer)
 425 {
 426         struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
 427         struct sock *sk = sock->sk;
 428         struct inet_sock *inet = inet_sk(sk);
 429         struct ipv6_pinfo *np = inet6_sk(sk);
 430
 431         sin->sin6_family = AF_INET6;
 432         sin->sin6_flowinfo = 0;
 433         sin->sin6_scope_id = 0;
 434         if (peer) {
 435                 if (!inet->dport)
 436                         return -ENOTCONN;
 437                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
 438                     peer == 1)
 439                         return -ENOTCONN;
 440                 sin->sin6_port = inet->dport;
 441                 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
 442                 if (np->sndflow)
 443                         sin->sin6_flowinfo = np->flow_label;
 444         } else {
 445                 if (ipv6_addr_any(&np->rcv_saddr))
 446                         ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
 447                 else
 448                         ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
 449
 450                 sin->sin6_port = inet->sport;
 451         }
 452         if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
 453                 sin->sin6_scope_id = sk->sk_bound_dev_if;
 454         *uaddr_len = sizeof(*sin);
 455         return(0);
 456 }
 457
 458 EXPORT_SYMBOL(inet6_getname);
 459
 460 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 461 {
 462         struct sock *sk = sock->sk;
 463
 464         switch(cmd)
 465         {
 466         case SIOCGSTAMP:
 467                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
 468
 469         case SIOCGSTAMPNS:
 470                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
 471
 472         case SIOCADDRT:
 473         case SIOCDELRT:
 474
 475                 return(ipv6_route_ioctl(cmd,(void __user *)arg));
 476
 477         case SIOCSIFADDR:
 478                 return addrconf_add_ifaddr((void __user *) arg);
 479         case SIOCDIFADDR:
 480                 return addrconf_del_ifaddr((void __user *) arg);
 481         case SIOCSIFDSTADDR:
 482                 return addrconf_set_dstaddr((void __user *) arg);
 483         default:
 484                 if (!sk->sk_prot->ioctl)
 485                         return -ENOIOCTLCMD;
 486                 return sk->sk_prot->ioctl(sk, cmd, arg);
 487         }
 488         /*NOTREACHED*/
 489         return(0);
 490 }
 491
 492 EXPORT_SYMBOL(inet6_ioctl);
 493
 494 const struct proto_ops inet6_stream_ops = {
 495         .family            = PF_INET6,
 496         .owner             = THIS_MODULE,
 497         .release           = inet6_release,
 498         .bind              = inet6_bind,
 499         .connect           = inet_stream_connect,       /* ok           */
 500         .socketpair        = sock_no_socketpair,        /* a do nothing */
 501         .accept            = inet_accept,               /* ok           */
 502         .getname           = inet6_getname,
 503         .poll              = tcp_poll,                  /* ok           */
 504         .ioctl             = inet6_ioctl,               /* must change  */
 505         .listen            = inet_listen,               /* ok           */
 506         .shutdown          = inet_shutdown,             /* ok           */
 507         .setsockopt        = sock_common_setsockopt,    /* ok           */
 508         .getsockopt        = sock_common_getsockopt,    /* ok           */
 509         .sendmsg           = tcp_sendmsg,               /* ok           */
 510         .recvmsg           = sock_common_recvmsg,       /* ok           */
 511         .mmap              = sock_no_mmap,
 512         .sendpage          = tcp_sendpage,
 513 #ifdef CONFIG_COMPAT
 514         .compat_setsockopt = compat_sock_common_setsockopt,
 515         .compat_getsockopt = compat_sock_common_getsockopt,
 516 #endif
 517 };
 518
 519 const struct proto_ops inet6_dgram_ops = {
 520         .family            = PF_INET6,
 521         .owner             = THIS_MODULE,
 522         .release           = inet6_release,
 523         .bind              = inet6_bind,
 524         .connect           = inet_dgram_connect,        /* ok           */
 525         .socketpair        = sock_no_socketpair,        /* a do nothing */
 526         .accept            = sock_no_accept,            /* a do nothing */
 527         .getname           = inet6_getname,
 528         .poll              = udp_poll,                  /* ok           */
 529         .ioctl             = inet6_ioctl,               /* must change  */
 530         .listen            = sock_no_listen,            /* ok           */
 531         .shutdown          = inet_shutdown,             /* ok           */
 532         .setsockopt        = sock_common_setsockopt,    /* ok           */
 533         .getsockopt        = sock_common_getsockopt,    /* ok           */
 534         .sendmsg           = inet_sendmsg,              /* ok           */
 535         .recvmsg           = sock_common_recvmsg,       /* ok           */
 536         .mmap              = sock_no_mmap,
 537         .sendpage          = sock_no_sendpage,
 538 #ifdef CONFIG_COMPAT
 539         .compat_setsockopt = compat_sock_common_setsockopt,
 540         .compat_getsockopt = compat_sock_common_getsockopt,
 541 #endif
 542 };
 543
 544 static struct net_proto_family inet6_family_ops = {
 545         .family = PF_INET6,
 546         .create = inet6_create,
 547         .owner  = THIS_MODULE,
 548 };
 549
 550 /* Same as inet6_dgram_ops, sans udp_poll.  */
 551 static const struct proto_ops inet6_sockraw_ops = {
 552         .family            = PF_INET6,
 553         .owner             = THIS_MODULE,
 554         .release           = inet6_release,
 555         .bind              = inet6_bind,
 556         .connect           = inet_dgram_connect,        /* ok           */
 557         .socketpair        = sock_no_socketpair,        /* a do nothing */
 558         .accept            = sock_no_accept,            /* a do nothing */
 559         .getname           = inet6_getname,
 560         .poll              = datagram_poll,             /* ok           */
 561         .ioctl             = inet6_ioctl,               /* must change  */
 562         .listen            = sock_no_listen,            /* ok           */
 563         .shutdown          = inet_shutdown,             /* ok           */
 564         .setsockopt        = sock_common_setsockopt,    /* ok           */
 565         .getsockopt        = sock_common_getsockopt,    /* ok           */
 566         .sendmsg           = inet_sendmsg,              /* ok           */
 567         .recvmsg           = sock_common_recvmsg,       /* ok           */
 568         .mmap              = sock_no_mmap,
 569         .sendpage          = sock_no_sendpage,
 570 #ifdef CONFIG_COMPAT
 571         .compat_setsockopt = compat_sock_common_setsockopt,
 572         .compat_getsockopt = compat_sock_common_getsockopt,
 573 #endif
 574 };
 575
 576 static struct inet_protosw rawv6_protosw = {
 577         .type           = SOCK_RAW,
 578         .protocol       = IPPROTO_IP,   /* wild card */
 579         .prot           = &rawv6_prot,
 580         .ops            = &inet6_sockraw_ops,
 581         .capability     = CAP_NET_RAW,
 582         .no_check       = UDP_CSUM_DEFAULT,
 583         .flags          = INET_PROTOSW_REUSE,
 584 };
 585
 586 void
 587 inet6_register_protosw(struct inet_protosw *p)
 588 {
 589         struct list_head *lh;
 590         struct inet_protosw *answer;
 591         int protocol = p->protocol;
 592         struct list_head *last_perm;
 593
 594         spin_lock_bh(&inetsw6_lock);
 595
 596         if (p->type >= SOCK_MAX)
 597                 goto out_illegal;
 598
 599         /* If we are trying to override a permanent protocol, bail. */
 600         answer = NULL;
 601         last_perm = &inetsw6[p->type];
 602         list_for_each(lh, &inetsw6[p->type]) {
 603                 answer = list_entry(lh, struct inet_protosw, list);
 604
 605                 /* Check only the non-wild match. */
 606                 if (INET_PROTOSW_PERMANENT & answer->flags) {
 607                         if (protocol == answer->protocol)
 608                                 break;
 609                         last_perm = lh;
 610                 }
 611
 612                 answer = NULL;
 613         }
 614         if (answer)
 615                 goto out_permanent;
 616
 617         /* Add the new entry after the last permanent entry if any, so that
 618          * the new entry does not override a permanent entry when matched with
 619          * a wild-card protocol. But it is allowed to override any existing
 620          * non-permanent entry.  This means that when we remove this entry, the
 621          * system automatically returns to the old behavior.
 622          */
 623         list_add_rcu(&p->list, last_perm);
 624 out:
 625         spin_unlock_bh(&inetsw6_lock);
 626         return;
 627
 628 out_permanent:
 629         printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
 630                protocol);
 631         goto out;
 632
 633 out_illegal:
 634         printk(KERN_ERR
 635                "Ignoring attempt to register invalid socket type %d.\n",
 636                p->type);
 637         goto out;
 638 }
 639
 640 EXPORT_SYMBOL(inet6_register_protosw);
 641
 642 void
 643 inet6_unregister_protosw(struct inet_protosw *p)
 644 {
 645         if (INET_PROTOSW_PERMANENT & p->flags) {
 646                 printk(KERN_ERR
 647                        "Attempt to unregister permanent protocol %d.\n",
 648                        p->protocol);
 649         } else {
 650                 spin_lock_bh(&inetsw6_lock);
 651                 list_del_rcu(&p->list);
 652                 spin_unlock_bh(&inetsw6_lock);
 653
 654                 synchronize_net();
 655         }
 656 }
 657
 658 EXPORT_SYMBOL(inet6_unregister_protosw);
 659
 660 int inet6_sk_rebuild_header(struct sock *sk)
 661 {
 662         int err;
 663         struct dst_entry *dst;
 664         struct ipv6_pinfo *np = inet6_sk(sk);
 665
 666         dst = __sk_dst_check(sk, np->dst_cookie);
 667
 668         if (dst == NULL) {
 669                 struct inet_sock *inet = inet_sk(sk);
 670                 struct in6_addr *final_p = NULL, final;
 671                 struct flowi fl;
 672
 673                 memset(&fl, 0, sizeof(fl));
 674                 fl.proto = sk->sk_protocol;
 675                 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 676                 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
 677                 fl.fl6_flowlabel = np->flow_label;
 678                 fl.oif = sk->sk_bound_dev_if;
 679                 fl.fl_ip_dport = inet->dport;
 680                 fl.fl_ip_sport = inet->sport;
 681                 security_sk_classify_flow(sk, &fl);
 682
 683                 if (np->opt && np->opt->srcrt) {
 684                         struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
 685                         ipv6_addr_copy(&final, &fl.fl6_dst);
 686                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 687                         final_p = &final;
 688                 }
 689
 690                 err = ip6_dst_lookup(sk, &dst, &fl);
 691                 if (err) {
 692                         sk->sk_route_caps = 0;
 693                         return err;
 694                 }
 695                 if (final_p)
 696                         ipv6_addr_copy(&fl.fl6_dst, final_p);
 697
 698                 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
 699                         sk->sk_err_soft = -err;
 700                         return err;
 701                 }
 702
 703                 __ip6_dst_store(sk, dst, NULL, NULL);
 704         }
 705
 706         return 0;
 707 }
 708
 709 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
 710
 711 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
 712 {
 713         struct ipv6_pinfo *np = inet6_sk(sk);
 714         struct inet6_skb_parm *opt = IP6CB(skb);
 715
 716         if (np->rxopt.all) {
 717                 if ((opt->hop && (np->rxopt.bits.hopopts ||
 718                                   np->rxopt.bits.ohopopts)) ||
 719                     ((IPV6_FLOWINFO_MASK &
 720                       *(__be32 *)skb_network_header(skb)) &&
 721                      np->rxopt.bits.rxflow) ||
 722                     (opt->srcrt && (np->rxopt.bits.srcrt ||
 723                      np->rxopt.bits.osrcrt)) ||
 724                     ((opt->dst1 || opt->dst0) &&
 725                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
 726                         return 1;
 727         }
 728         return 0;
 729 }
 730
 731 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
 732
 733 static int __init init_ipv6_mibs(void)
 734 {
 735         if (snmp_mib_init((void **)ipv6_statistics, sizeof (struct ipstats_mib),
 736                           __alignof__(struct ipstats_mib)) < 0)
 737                 goto err_ip_mib;
 738         if (snmp_mib_init((void **)icmpv6_statistics, sizeof (struct icmpv6_mib),
 739                           __alignof__(struct icmpv6_mib)) < 0)
 740                 goto err_icmp_mib;
 741         if (snmp_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib),
 742                           __alignof__(struct udp_mib)) < 0)
 743                 goto err_udp_mib;
 744         if (snmp_mib_init((void **)udplite_stats_in6, sizeof (struct udp_mib),
 745                           __alignof__(struct udp_mib)) < 0)
 746                 goto err_udplite_mib;
 747         return 0;
 748
 749 err_udplite_mib:
 750         snmp_mib_free((void **)udp_stats_in6);
 751 err_udp_mib:
 752         snmp_mib_free((void **)icmpv6_statistics);
 753 err_icmp_mib:
 754         snmp_mib_free((void **)ipv6_statistics);
 755 err_ip_mib:
 756         return -ENOMEM;
 757
 758 }
 759
 760 static void cleanup_ipv6_mibs(void)
 761 {
 762         snmp_mib_free((void **)ipv6_statistics);
 763         snmp_mib_free((void **)icmpv6_statistics);
 764         snmp_mib_free((void **)udp_stats_in6);
 765         snmp_mib_free((void **)udplite_stats_in6);
 766 }
 767
 768 static int __init inet6_init(void)
 769 {
 770         struct sk_buff *dummy_skb;
 771         struct list_head *r;
 772         int err = 0;
 773
 774         BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
 775
 776 #ifdef MODULE
 777 #if 0 /* FIXME --RR */
 778         if (!mod_member_present(&__this_module, can_unload))
 779           return -EINVAL;
 780
 781         __this_module.can_unload = &ipv6_unload;
 782 #endif
 783 #endif
 784
 785         /* Register the socket-side information for inet6_create.  */
 786         for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
 787                 INIT_LIST_HEAD(r);
 788
 789         if (disable_ipv6_mod) {
 790                 printk(KERN_INFO
 791                        "IPv6: Loaded, but administratively disabled, "
 792                        "reboot required to enable\n");
 793                 goto out;
 794         }
 795
 796         err = proto_register(&tcpv6_prot, 1);
 797         if (err)
 798                 goto out;
 799
 800         err = proto_register(&udpv6_prot, 1);
 801         if (err)
 802                 goto out_unregister_tcp_proto;
 803
 804         err = proto_register(&udplitev6_prot, 1);
 805         if (err)
 806                 goto out_unregister_udp_proto;
 807
 808         err = proto_register(&rawv6_prot, 1);
 809         if (err)
 810                 goto out_unregister_udplite_proto;
 811
 812
 813         /* We MUST register RAW sockets before we create the ICMP6,
 814          * IGMP6, or NDISC control sockets.
 815          */
 816         inet6_register_protosw(&rawv6_protosw);
 817
 818         /* Register the family here so that the init calls below will
 819          * be able to create sockets. (?? is this dangerous ??)
 820          */
 821         err = sock_register(&inet6_family_ops);
 822         if (err)
 823                 goto out_unregister_raw_proto;
 824
 825         /* Initialise ipv6 mibs */
 826         err = init_ipv6_mibs();
 827         if (err)
 828                 goto out_unregister_sock;
 829
 830         /*
 831          *      ipngwg API draft makes clear that the correct semantics
 832          *      for TCP and UDP is to consider one TCP and UDP instance
 833          *      in a host availiable by both INET and INET6 APIs and
 834          *      able to communicate via both network protocols.
 835          */
 836
 837 #ifdef CONFIG_SYSCTL
 838         ipv6_sysctl_register();
 839 #endif
 840         err = icmpv6_init(&inet6_family_ops);
 841         if (err)
 842                 goto icmp_fail;
 843 #ifdef CONFIG_IPV6_MROUTE
 844         ip6_mr_init();
 845 #endif
 846         err = ndisc_init(&inet6_family_ops);
 847         if (err)
 848                 goto ndisc_fail;
 849         err = igmp6_init(&inet6_family_ops);
 850         if (err)
 851                 goto igmp_fail;
 852         err = ipv6_netfilter_init();
 853         if (err)
 854                 goto netfilter_fail;
 855         /* Create /proc/foo6 entries. */
 856 #ifdef CONFIG_PROC_FS
 857         err = -ENOMEM;
 858         if (raw6_proc_init())
 859                 goto proc_raw6_fail;
 860         if (tcp6_proc_init())
 861                 goto proc_tcp6_fail;
 862         if (udp6_proc_init())
 863                 goto proc_udp6_fail;
 864         if (udplite6_proc_init())
 865                 goto proc_udplite6_fail;
 866         if (ipv6_misc_proc_init())
 867                 goto proc_misc6_fail;
 868
 869         if (ac6_proc_init())
 870                 goto proc_anycast6_fail;
 871         if (if6_proc_init())
 872                 goto proc_if6_fail;
 873 #endif
 874         ip6_route_init();
 875         ip6_flowlabel_init();
 876         err = addrconf_init();
 877         if (err)
 878                 goto addrconf_fail;
 879
 880         /* Init v6 extension headers. */
 881         ipv6_rthdr_init();
 882         ipv6_frag_init();
 883         ipv6_nodata_init();
 884         ipv6_destopt_init();
 885 #ifdef CONFIG_IPV6_MIP6
 886         mip6_init();
 887 #endif
 888
 889         /* Init v6 transport protocols. */
 890         udpv6_init();
 891         udplitev6_init();
 892         tcpv6_init();
 893
 894         ipv6_packet_init();
 895         err = 0;
 896 out:
 897         return err;
 898
 899 addrconf_fail:
 900         ip6_flowlabel_cleanup();
 901         ip6_route_cleanup();
 902 #ifdef CONFIG_PROC_FS
 903         if6_proc_exit();
 904 proc_if6_fail:
 905         ac6_proc_exit();
 906 proc_anycast6_fail:
 907         ipv6_misc_proc_exit();
 908 proc_misc6_fail:
 909         udplite6_proc_exit();
 910 proc_udplite6_fail:
 911         udp6_proc_exit();
 912 proc_udp6_fail:
 913         tcp6_proc_exit();
 914 proc_tcp6_fail:
 915         raw6_proc_exit();
 916 proc_raw6_fail:
 917 #endif
 918         ipv6_netfilter_fini();
 919 netfilter_fail:
 920         igmp6_cleanup();
 921 igmp_fail:
 922         ndisc_cleanup();
 923 ndisc_fail:
 924         icmpv6_cleanup();
 925 icmp_fail:
 926 #ifdef CONFIG_SYSCTL
 927         ipv6_sysctl_unregister();
 928 #endif
 929         cleanup_ipv6_mibs();
 930 out_unregister_sock:
 931         sock_unregister(PF_INET6);
 932 out_unregister_raw_proto:
 933         proto_unregister(&rawv6_prot);
 934 out_unregister_udplite_proto:
 935         proto_unregister(&udplitev6_prot);
 936 out_unregister_udp_proto:
 937         proto_unregister(&udpv6_prot);
 938 out_unregister_tcp_proto:
 939         proto_unregister(&tcpv6_prot);
 940         goto out;
 941 }
 942 module_init(inet6_init);
 943
 944 static void __exit inet6_exit(void)
 945 {
 946         if (disable_ipv6_mod)
 947                 return;
 948
 949         /* First of all disallow new sockets creation. */
 950         sock_unregister(PF_INET6);
 951         /* Disallow any further netlink messages */
 952         rtnl_unregister_all(PF_INET6);
 953
 954         /* Cleanup code parts. */
 955         ipv6_packet_cleanup();
 956 #ifdef CONFIG_IPV6_MIP6
 957         mip6_fini();
 958 #endif
 959         addrconf_cleanup();
 960         ip6_flowlabel_cleanup();
 961         ip6_route_cleanup();
 962 #ifdef CONFIG_PROC_FS
 963
 964         /* Cleanup code parts. */
 965         if6_proc_exit();
 966         ac6_proc_exit();
 967         ipv6_misc_proc_exit();
 968         udplite6_proc_exit();
 969         udp6_proc_exit();
 970         tcp6_proc_exit();
 971         raw6_proc_exit();
 972 #endif
 973         ipv6_netfilter_fini();
 974         igmp6_cleanup();
 975         ndisc_cleanup();
 976         icmpv6_cleanup();
 977 #ifdef CONFIG_SYSCTL
 978         ipv6_sysctl_unregister();
 979 #endif
 980         cleanup_ipv6_mibs();
 981         proto_unregister(&rawv6_prot);
 982         proto_unregister(&udplitev6_prot);
 983         proto_unregister(&udpv6_prot);
 984         proto_unregister(&tcpv6_prot);
 985 }
 986 module_exit(inet6_exit);
 987
 988 MODULE_ALIAS_NETPROTO(PF_INET6);