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/smp_lock.h>
  46 #include <linux/netfilter_ipv6.h>
  47
  48 #include <net/ip.h>
  49 #include <net/ipv6.h>
  50 #include <net/udp.h>
  51 #include <net/udplite.h>
  52 #include <net/tcp.h>
  53 #include <net/ipip.h>
  54 #include <net/protocol.h>
  55 #include <net/inet_common.h>
  56 #include <net/transp_v6.h>
  57 #include <net/ip6_route.h>
  58 #include <net/addrconf.h>
  59 #ifdef CONFIG_IPV6_TUNNEL
  60 #include <net/ip6_tunnel.h>
  61 #endif
  62 #ifdef CONFIG_IPV6_MIP6
  63 #include <net/mip6.h>
  64 #endif
  65
  66 #include <asm/uaccess.h>
  67 #include <asm/system.h>
  68
  69 MODULE_AUTHOR("Cast of dozens");
  70 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
  71 MODULE_LICENSE("GPL");
  72
  73 int sysctl_ipv6_bindv6only __read_mostly;
  74
  75 /* The inetsw table contains everything that inet_create needs to
  76  * build a new socket.
  77  */
  78 static struct list_head inetsw6[SOCK_MAX];
  79 static DEFINE_SPINLOCK(inetsw6_lock);
  80
  81 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
  82 {
  83         const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
  84
  85         return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
  86 }
  87
  88 static int inet6_create(struct socket *sock, int protocol)
  89 {
  90         struct inet_sock *inet;
  91         struct ipv6_pinfo *np;
  92         struct sock *sk;
  93         struct list_head *p;
  94         struct inet_protosw *answer;
  95         struct proto *answer_prot;
  96         unsigned char answer_flags;
  97         char answer_no_check;
  98         int try_loading_module = 0;
  99         int err;
 100
 101         if (sock->type != SOCK_RAW &&
 102             sock->type != SOCK_DGRAM &&
 103             !inet_ehash_secret)
 104                 build_ehash_secret();
 105
 106         /* Look for the requested type/protocol pair. */
 107         answer = NULL;
 108 lookup_protocol:
 109         err = -ESOCKTNOSUPPORT;
 110         rcu_read_lock();
 111         list_for_each_rcu(p, &inetsw6[sock->type]) {
 112                 answer = list_entry(p, struct inet_protosw, list);
 113
 114                 /* Check the non-wild match. */
 115                 if (protocol == answer->protocol) {
 116                         if (protocol != IPPROTO_IP)
 117                                 break;
 118                 } else {
 119                         /* Check for the two wild cases. */
 120                         if (IPPROTO_IP == protocol) {
 121                                 protocol = answer->protocol;
 122                                 break;
 123                         }
 124                         if (IPPROTO_IP == answer->protocol)
 125                                 break;
 126                 }
 127                 err = -EPROTONOSUPPORT;
 128                 answer = NULL;
 129         }
 130
 131         if (!answer) {
 132                 if (try_loading_module < 2) {
 133                         rcu_read_unlock();
 134                         /*
 135                          * Be more specific, e.g. net-pf-10-proto-132-type-1
 136                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
 137                          */
 138                         if (++try_loading_module == 1)
 139                                 request_module("net-pf-%d-proto-%d-type-%d",
 140                                                 PF_INET6, protocol, sock->type);
 141                         /*
 142                          * Fall back to generic, e.g. net-pf-10-proto-132
 143                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
 144                          */
 145                         else
 146                                 request_module("net-pf-%d-proto-%d",
 147                                                 PF_INET6, protocol);
 148                         goto lookup_protocol;
 149                 } else
 150                         goto out_rcu_unlock;
 151         }
 152
 153         err = -EPERM;
 154         if (answer->capability > 0 && !capable(answer->capability))
 155                 goto out_rcu_unlock;
 156
 157         sock->ops = answer->ops;
 158         answer_prot = answer->prot;
 159         answer_no_check = answer->no_check;
 160         answer_flags = answer->flags;
 161         rcu_read_unlock();
 162
 163         BUG_TRAP(answer_prot->slab != NULL);
 164
 165         err = -ENOBUFS;
 166         sk = sk_alloc(PF_INET6, GFP_KERNEL, answer_prot, 1);
 167         if (sk == NULL)
 168                 goto out;
 169
 170         sock_init_data(sock, sk);
 171
 172         err = 0;
 173         sk->sk_no_check = answer_no_check;
 174         if (INET_PROTOSW_REUSE & answer_flags)
 175                 sk->sk_reuse = 1;
 176
 177         inet = inet_sk(sk);
 178         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
 179
 180         if (SOCK_RAW == sock->type) {
 181                 inet->num = protocol;
 182                 if (IPPROTO_RAW == protocol)
 183                         inet->hdrincl = 1;
 184         }
 185
 186         sk->sk_destruct         = inet_sock_destruct;
 187         sk->sk_family           = PF_INET6;
 188         sk->sk_protocol         = protocol;
 189
 190         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
 191
 192         inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
 193         np->hop_limit   = -1;
 194         np->mcast_hops  = -1;
 195         np->mc_loop     = 1;
 196         np->pmtudisc    = IPV6_PMTUDISC_WANT;
 197         np->ipv6only    = sysctl_ipv6_bindv6only;
 198
 199         /* Init the ipv4 part of the socket since we can have sockets
 200          * using v6 API for ipv4.
 201          */
 202         inet->uc_ttl    = -1;
 203
 204         inet->mc_loop   = 1;
 205         inet->mc_ttl    = 1;
 206         inet->mc_index  = 0;
 207         inet->mc_list   = NULL;
 208
 209         if (ipv4_config.no_pmtu_disc)
 210                 inet->pmtudisc = IP_PMTUDISC_DONT;
 211         else
 212                 inet->pmtudisc = IP_PMTUDISC_WANT;
 213         /*
 214          * Increment only the relevant sk_prot->socks debug field, this changes
 215          * the previous behaviour of incrementing both the equivalent to
 216          * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
 217          *
 218          * This allows better debug granularity as we'll know exactly how many
 219          * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
 220          * transport protocol socks. -acme
 221          */
 222         sk_refcnt_debug_inc(sk);
 223
 224         if (inet->num) {
 225                 /* It assumes that any protocol which allows
 226                  * the user to assign a number at socket
 227                  * creation time automatically shares.
 228                  */
 229                 inet->sport = htons(inet->num);
 230                 sk->sk_prot->hash(sk);
 231         }
 232         if (sk->sk_prot->init) {
 233                 err = sk->sk_prot->init(sk);
 234                 if (err) {
 235                         sk_common_release(sk);
 236                         goto out;
 237                 }
 238         }
 239 out:
 240         return err;
 241 out_rcu_unlock:
 242         rcu_read_unlock();
 243         goto out;
 244 }
 245
 246
 247 /* bind for INET6 API */
 248 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 249 {
 250         struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
 251         struct sock *sk = sock->sk;
 252         struct inet_sock *inet = inet_sk(sk);
 253         struct ipv6_pinfo *np = inet6_sk(sk);
 254         __be32 v4addr = 0;
 255         unsigned short snum;
 256         int addr_type = 0;
 257         int err = 0;
 258
 259         /* If the socket has its own bind function then use it. */
 260         if (sk->sk_prot->bind)
 261                 return sk->sk_prot->bind(sk, uaddr, addr_len);
 262
 263         if (addr_len < SIN6_LEN_RFC2133)
 264                 return -EINVAL;
 265         addr_type = ipv6_addr_type(&addr->sin6_addr);
 266         if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
 267                 return -EINVAL;
 268
 269         snum = ntohs(addr->sin6_port);
 270         if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
 271                 return -EACCES;
 272
 273         lock_sock(sk);
 274
 275         /* Check these errors (active socket, double bind). */
 276         if (sk->sk_state != TCP_CLOSE || inet->num) {
 277                 err = -EINVAL;
 278                 goto out;
 279         }
 280
 281         /* Check if the address belongs to the host. */
 282         if (addr_type == IPV6_ADDR_MAPPED) {
 283                 v4addr = addr->sin6_addr.s6_addr32[3];
 284                 if (inet_addr_type(v4addr) != RTN_LOCAL) {
 285                         err = -EADDRNOTAVAIL;
 286                         goto out;
 287                 }
 288         } else {
 289                 if (addr_type != IPV6_ADDR_ANY) {
 290                         struct net_device *dev = NULL;
 291
 292                         if (addr_type & IPV6_ADDR_LINKLOCAL) {
 293                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 294                                     addr->sin6_scope_id) {
 295                                         /* Override any existing binding, if another one
 296                                          * is supplied by user.
 297                                          */
 298                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
 299                                 }
 300
 301                                 /* Binding to link-local address requires an interface */
 302                                 if (!sk->sk_bound_dev_if) {
 303                                         err = -EINVAL;
 304                                         goto out;
 305                                 }
 306                                 dev = dev_get_by_index(sk->sk_bound_dev_if);
 307                                 if (!dev) {
 308                                         err = -ENODEV;
 309                                         goto out;
 310                                 }
 311                         }
 312
 313                         /* ipv4 addr of the socket is invalid.  Only the
 314                          * unspecified and mapped address have a v4 equivalent.
 315                          */
 316                         v4addr = LOOPBACK4_IPV6;
 317                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
 318                                 if (!ipv6_chk_addr(&addr->sin6_addr, dev, 0)) {
 319                                         if (dev)
 320                                                 dev_put(dev);
 321                                         err = -EADDRNOTAVAIL;
 322                                         goto out;
 323                                 }
 324                         }
 325                         if (dev)
 326                                 dev_put(dev);
 327                 }
 328         }
 329
 330         inet->rcv_saddr = v4addr;
 331         inet->saddr = v4addr;
 332
 333         ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
 334
 335         if (!(addr_type & IPV6_ADDR_MULTICAST))
 336                 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
 337
 338         /* Make sure we are allowed to bind here. */
 339         if (sk->sk_prot->get_port(sk, snum)) {
 340                 inet_reset_saddr(sk);
 341                 err = -EADDRINUSE;
 342                 goto out;
 343         }
 344
 345         if (addr_type != IPV6_ADDR_ANY)
 346                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
 347         if (snum)
 348                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
 349         inet->sport = htons(inet->num);
 350         inet->dport = 0;
 351         inet->daddr = 0;
 352 out:
 353         release_sock(sk);
 354         return err;
 355 }
 356
 357 EXPORT_SYMBOL(inet6_bind);
 358
 359 int inet6_release(struct socket *sock)
 360 {
 361         struct sock *sk = sock->sk;
 362
 363         if (sk == NULL)
 364                 return -EINVAL;
 365
 366         /* Free mc lists */
 367         ipv6_sock_mc_close(sk);
 368
 369         /* Free ac lists */
 370         ipv6_sock_ac_close(sk);
 371
 372         return inet_release(sock);
 373 }
 374
 375 EXPORT_SYMBOL(inet6_release);
 376
 377 int inet6_destroy_sock(struct sock *sk)
 378 {
 379         struct ipv6_pinfo *np = inet6_sk(sk);
 380         struct sk_buff *skb;
 381         struct ipv6_txoptions *opt;
 382
 383         /* Release rx options */
 384
 385         if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
 386                 kfree_skb(skb);
 387
 388         /* Free flowlabels */
 389         fl6_free_socklist(sk);
 390
 391         /* Free tx options */
 392
 393         if ((opt = xchg(&np->opt, NULL)) != NULL)
 394                 sock_kfree_s(sk, opt, opt->tot_len);
 395
 396         return 0;
 397 }
 398
 399 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
 400
 401 /*
 402  *      This does both peername and sockname.
 403  */
 404
 405 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 406                  int *uaddr_len, int peer)
 407 {
 408         struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
 409         struct sock *sk = sock->sk;
 410         struct inet_sock *inet = inet_sk(sk);
 411         struct ipv6_pinfo *np = inet6_sk(sk);
 412
 413         sin->sin6_family = AF_INET6;
 414         sin->sin6_flowinfo = 0;
 415         sin->sin6_scope_id = 0;
 416         if (peer) {
 417                 if (!inet->dport)
 418                         return -ENOTCONN;
 419                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
 420                     peer == 1)
 421                         return -ENOTCONN;
 422                 sin->sin6_port = inet->dport;
 423                 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
 424                 if (np->sndflow)
 425                         sin->sin6_flowinfo = np->flow_label;
 426         } else {
 427                 if (ipv6_addr_any(&np->rcv_saddr))
 428                         ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
 429                 else
 430                         ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
 431
 432                 sin->sin6_port = inet->sport;
 433         }
 434         if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
 435                 sin->sin6_scope_id = sk->sk_bound_dev_if;
 436         *uaddr_len = sizeof(*sin);
 437         return(0);
 438 }
 439
 440 EXPORT_SYMBOL(inet6_getname);
 441
 442 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 443 {
 444         struct sock *sk = sock->sk;
 445
 446         switch(cmd)
 447         {
 448         case SIOCGSTAMP:
 449                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
 450
 451         case SIOCGSTAMPNS:
 452                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
 453
 454         case SIOCADDRT:
 455         case SIOCDELRT:
 456
 457                 return(ipv6_route_ioctl(cmd,(void __user *)arg));
 458
 459         case SIOCSIFADDR:
 460                 return addrconf_add_ifaddr((void __user *) arg);
 461         case SIOCDIFADDR:
 462                 return addrconf_del_ifaddr((void __user *) arg);
 463         case SIOCSIFDSTADDR:
 464                 return addrconf_set_dstaddr((void __user *) arg);
 465         default:
 466                 if (!sk->sk_prot->ioctl)
 467                         return -ENOIOCTLCMD;
 468                 return sk->sk_prot->ioctl(sk, cmd, arg);
 469         }
 470         /*NOTREACHED*/
 471         return(0);
 472 }
 473
 474 EXPORT_SYMBOL(inet6_ioctl);
 475
 476 const struct proto_ops inet6_stream_ops = {
 477         .family            = PF_INET6,
 478         .owner             = THIS_MODULE,
 479         .release           = inet6_release,
 480         .bind              = inet6_bind,
 481         .connect           = inet_stream_connect,       /* ok           */
 482         .socketpair        = sock_no_socketpair,        /* a do nothing */
 483         .accept            = inet_accept,               /* ok           */
 484         .getname           = inet6_getname,
 485         .poll              = tcp_poll,                  /* ok           */
 486         .ioctl             = inet6_ioctl,               /* must change  */
 487         .listen            = inet_listen,               /* ok           */
 488         .shutdown          = inet_shutdown,             /* ok           */
 489         .setsockopt        = sock_common_setsockopt,    /* ok           */
 490         .getsockopt        = sock_common_getsockopt,    /* ok           */
 491         .sendmsg           = inet_sendmsg,              /* ok           */
 492         .recvmsg           = sock_common_recvmsg,       /* ok           */
 493         .mmap              = sock_no_mmap,
 494         .sendpage          = tcp_sendpage,
 495 #ifdef CONFIG_COMPAT
 496         .compat_setsockopt = compat_sock_common_setsockopt,
 497         .compat_getsockopt = compat_sock_common_getsockopt,
 498 #endif
 499 };
 500
 501 const struct proto_ops inet6_dgram_ops = {
 502         .family            = PF_INET6,
 503         .owner             = THIS_MODULE,
 504         .release           = inet6_release,
 505         .bind              = inet6_bind,
 506         .connect           = inet_dgram_connect,        /* ok           */
 507         .socketpair        = sock_no_socketpair,        /* a do nothing */
 508         .accept            = sock_no_accept,            /* a do nothing */
 509         .getname           = inet6_getname,
 510         .poll              = udp_poll,                  /* ok           */
 511         .ioctl             = inet6_ioctl,               /* must change  */
 512         .listen            = sock_no_listen,            /* ok           */
 513         .shutdown          = inet_shutdown,             /* ok           */
 514         .setsockopt        = sock_common_setsockopt,    /* ok           */
 515         .getsockopt        = sock_common_getsockopt,    /* ok           */
 516         .sendmsg           = inet_sendmsg,              /* ok           */
 517         .recvmsg           = sock_common_recvmsg,       /* ok           */
 518         .mmap              = sock_no_mmap,
 519         .sendpage          = sock_no_sendpage,
 520 #ifdef CONFIG_COMPAT
 521         .compat_setsockopt = compat_sock_common_setsockopt,
 522         .compat_getsockopt = compat_sock_common_getsockopt,
 523 #endif
 524 };
 525
 526 static struct net_proto_family inet6_family_ops = {
 527         .family = PF_INET6,
 528         .create = inet6_create,
 529         .owner  = THIS_MODULE,
 530 };
 531
 532 /* Same as inet6_dgram_ops, sans udp_poll.  */
 533 static const struct proto_ops inet6_sockraw_ops = {
 534         .family            = PF_INET6,
 535         .owner             = THIS_MODULE,
 536         .release           = inet6_release,
 537         .bind              = inet6_bind,
 538         .connect           = inet_dgram_connect,        /* ok           */
 539         .socketpair        = sock_no_socketpair,        /* a do nothing */
 540         .accept            = sock_no_accept,            /* a do nothing */
 541         .getname           = inet6_getname,
 542         .poll              = datagram_poll,             /* ok           */
 543         .ioctl             = inet6_ioctl,               /* must change  */
 544         .listen            = sock_no_listen,            /* ok           */
 545         .shutdown          = inet_shutdown,             /* ok           */
 546         .setsockopt        = sock_common_setsockopt,    /* ok           */
 547         .getsockopt        = sock_common_getsockopt,    /* ok           */
 548         .sendmsg           = inet_sendmsg,              /* ok           */
 549         .recvmsg           = sock_common_recvmsg,       /* ok           */
 550         .mmap              = sock_no_mmap,
 551         .sendpage          = sock_no_sendpage,
 552 #ifdef CONFIG_COMPAT
 553         .compat_setsockopt = compat_sock_common_setsockopt,
 554         .compat_getsockopt = compat_sock_common_getsockopt,
 555 #endif
 556 };
 557
 558 static struct inet_protosw rawv6_protosw = {
 559         .type           = SOCK_RAW,
 560         .protocol       = IPPROTO_IP,   /* wild card */
 561         .prot           = &rawv6_prot,
 562         .ops            = &inet6_sockraw_ops,
 563         .capability     = CAP_NET_RAW,
 564         .no_check       = UDP_CSUM_DEFAULT,
 565         .flags          = INET_PROTOSW_REUSE,
 566 };
 567
 568 void
 569 inet6_register_protosw(struct inet_protosw *p)
 570 {
 571         struct list_head *lh;
 572         struct inet_protosw *answer;
 573         int protocol = p->protocol;
 574         struct list_head *last_perm;
 575
 576         spin_lock_bh(&inetsw6_lock);
 577
 578         if (p->type >= SOCK_MAX)
 579                 goto out_illegal;
 580
 581         /* If we are trying to override a permanent protocol, bail. */
 582         answer = NULL;
 583         last_perm = &inetsw6[p->type];
 584         list_for_each(lh, &inetsw6[p->type]) {
 585                 answer = list_entry(lh, struct inet_protosw, list);
 586
 587                 /* Check only the non-wild match. */
 588                 if (INET_PROTOSW_PERMANENT & answer->flags) {
 589                         if (protocol == answer->protocol)
 590                                 break;
 591                         last_perm = lh;
 592                 }
 593
 594                 answer = NULL;
 595         }
 596         if (answer)
 597                 goto out_permanent;
 598
 599         /* Add the new entry after the last permanent entry if any, so that
 600          * the new entry does not override a permanent entry when matched with
 601          * a wild-card protocol. But it is allowed to override any existing
 602          * non-permanent entry.  This means that when we remove this entry, the
 603          * system automatically returns to the old behavior.
 604          */
 605         list_add_rcu(&p->list, last_perm);
 606 out:
 607         spin_unlock_bh(&inetsw6_lock);
 608         return;
 609
 610 out_permanent:
 611         printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
 612                protocol);
 613         goto out;
 614
 615 out_illegal:
 616         printk(KERN_ERR
 617                "Ignoring attempt to register invalid socket type %d.\n",
 618                p->type);
 619         goto out;
 620 }
 621
 622 EXPORT_SYMBOL(inet6_register_protosw);
 623
 624 void
 625 inet6_unregister_protosw(struct inet_protosw *p)
 626 {
 627         if (INET_PROTOSW_PERMANENT & p->flags) {
 628                 printk(KERN_ERR
 629                        "Attempt to unregister permanent protocol %d.\n",
 630                        p->protocol);
 631         } else {
 632                 spin_lock_bh(&inetsw6_lock);
 633                 list_del_rcu(&p->list);
 634                 spin_unlock_bh(&inetsw6_lock);
 635
 636                 synchronize_net();
 637         }
 638 }
 639
 640 EXPORT_SYMBOL(inet6_unregister_protosw);
 641
 642 int inet6_sk_rebuild_header(struct sock *sk)
 643 {
 644         int err;
 645         struct dst_entry *dst;
 646         struct ipv6_pinfo *np = inet6_sk(sk);
 647
 648         dst = __sk_dst_check(sk, np->dst_cookie);
 649
 650         if (dst == NULL) {
 651                 struct inet_sock *inet = inet_sk(sk);
 652                 struct in6_addr *final_p = NULL, final;
 653                 struct flowi fl;
 654
 655                 memset(&fl, 0, sizeof(fl));
 656                 fl.proto = sk->sk_protocol;
 657                 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 658                 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
 659                 fl.fl6_flowlabel = np->flow_label;
 660                 fl.oif = sk->sk_bound_dev_if;
 661                 fl.fl_ip_dport = inet->dport;
 662                 fl.fl_ip_sport = inet->sport;
 663                 security_sk_classify_flow(sk, &fl);
 664
 665                 if (np->opt && np->opt->srcrt) {
 666                         struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
 667                         ipv6_addr_copy(&final, &fl.fl6_dst);
 668                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 669                         final_p = &final;
 670                 }
 671
 672                 err = ip6_dst_lookup(sk, &dst, &fl);
 673                 if (err) {
 674                         sk->sk_route_caps = 0;
 675                         return err;
 676                 }
 677                 if (final_p)
 678                         ipv6_addr_copy(&fl.fl6_dst, final_p);
 679
 680                 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
 681                         sk->sk_err_soft = -err;
 682                         return err;
 683                 }
 684
 685                 __ip6_dst_store(sk, dst, NULL, NULL);
 686         }
 687
 688         return 0;
 689 }
 690
 691 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
 692
 693 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
 694 {
 695         struct ipv6_pinfo *np = inet6_sk(sk);
 696         struct inet6_skb_parm *opt = IP6CB(skb);
 697
 698         if (np->rxopt.all) {
 699                 if ((opt->hop && (np->rxopt.bits.hopopts ||
 700                                   np->rxopt.bits.ohopopts)) ||
 701                     ((IPV6_FLOWINFO_MASK &
 702                       *(__be32 *)skb_network_header(skb)) &&
 703                      np->rxopt.bits.rxflow) ||
 704                     (opt->srcrt && (np->rxopt.bits.srcrt ||
 705                      np->rxopt.bits.osrcrt)) ||
 706                     ((opt->dst1 || opt->dst0) &&
 707                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
 708                         return 1;
 709         }
 710         return 0;
 711 }
 712
 713 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
 714
 715 static int __init init_ipv6_mibs(void)
 716 {
 717         if (snmp_mib_init((void **)ipv6_statistics, sizeof (struct ipstats_mib),
 718                           __alignof__(struct ipstats_mib)) < 0)
 719                 goto err_ip_mib;
 720         if (snmp_mib_init((void **)icmpv6_statistics, sizeof (struct icmpv6_mib),
 721                           __alignof__(struct icmpv6_mib)) < 0)
 722                 goto err_icmp_mib;
 723         if (snmp_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib),
 724                           __alignof__(struct udp_mib)) < 0)
 725                 goto err_udp_mib;
 726         if (snmp_mib_init((void **)udplite_stats_in6, sizeof (struct udp_mib),
 727                           __alignof__(struct udp_mib)) < 0)
 728                 goto err_udplite_mib;
 729         return 0;
 730
 731 err_udplite_mib:
 732         snmp_mib_free((void **)udp_stats_in6);
 733 err_udp_mib:
 734         snmp_mib_free((void **)icmpv6_statistics);
 735 err_icmp_mib:
 736         snmp_mib_free((void **)ipv6_statistics);
 737 err_ip_mib:
 738         return -ENOMEM;
 739
 740 }
 741
 742 static void cleanup_ipv6_mibs(void)
 743 {
 744         snmp_mib_free((void **)ipv6_statistics);
 745         snmp_mib_free((void **)icmpv6_statistics);
 746         snmp_mib_free((void **)udp_stats_in6);
 747         snmp_mib_free((void **)udplite_stats_in6);
 748 }
 749
 750 static int __init inet6_init(void)
 751 {
 752         struct sk_buff *dummy_skb;
 753         struct list_head *r;
 754         int err;
 755
 756         BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
 757
 758 #ifdef MODULE
 759 #if 0 /* FIXME --RR */
 760         if (!mod_member_present(&__this_module, can_unload))
 761           return -EINVAL;
 762
 763         __this_module.can_unload = &ipv6_unload;
 764 #endif
 765 #endif
 766
 767         err = proto_register(&tcpv6_prot, 1);
 768         if (err)
 769                 goto out;
 770
 771         err = proto_register(&udpv6_prot, 1);
 772         if (err)
 773                 goto out_unregister_tcp_proto;
 774
 775         err = proto_register(&udplitev6_prot, 1);
 776         if (err)
 777                 goto out_unregister_udp_proto;
 778
 779         err = proto_register(&rawv6_prot, 1);
 780         if (err)
 781                 goto out_unregister_udplite_proto;
 782
 783
 784         /* Register the socket-side information for inet6_create.  */
 785         for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
 786                 INIT_LIST_HEAD(r);
 787
 788         /* We MUST register RAW sockets before we create the ICMP6,
 789          * IGMP6, or NDISC control sockets.
 790          */
 791         inet6_register_protosw(&rawv6_protosw);
 792
 793         /* Register the family here so that the init calls below will
 794          * be able to create sockets. (?? is this dangerous ??)
 795          */
 796         err = sock_register(&inet6_family_ops);
 797         if (err)
 798                 goto out_unregister_raw_proto;
 799
 800         /* Initialise ipv6 mibs */
 801         err = init_ipv6_mibs();
 802         if (err)
 803                 goto out_unregister_sock;
 804
 805         /*
 806          *      ipngwg API draft makes clear that the correct semantics
 807          *      for TCP and UDP is to consider one TCP and UDP instance
 808          *      in a host availiable by both INET and INET6 APIs and
 809          *      able to communicate via both network protocols.
 810          */
 811
 812 #ifdef CONFIG_SYSCTL
 813         ipv6_sysctl_register();
 814 #endif
 815         err = icmpv6_init(&inet6_family_ops);
 816         if (err)
 817                 goto icmp_fail;
 818         err = ndisc_init(&inet6_family_ops);
 819         if (err)
 820                 goto ndisc_fail;
 821         err = igmp6_init(&inet6_family_ops);
 822         if (err)
 823                 goto igmp_fail;
 824         err = ipv6_netfilter_init();
 825         if (err)
 826                 goto netfilter_fail;
 827         /* Create /proc/foo6 entries. */
 828 #ifdef CONFIG_PROC_FS
 829         err = -ENOMEM;
 830         if (raw6_proc_init())
 831                 goto proc_raw6_fail;
 832         if (tcp6_proc_init())
 833                 goto proc_tcp6_fail;
 834         if (udp6_proc_init())
 835                 goto proc_udp6_fail;
 836         if (udplite6_proc_init())
 837                 goto proc_udplite6_fail;
 838         if (ipv6_misc_proc_init())
 839                 goto proc_misc6_fail;
 840
 841         if (ac6_proc_init())
 842                 goto proc_anycast6_fail;
 843         if (if6_proc_init())
 844                 goto proc_if6_fail;
 845 #endif
 846         ip6_route_init();
 847         ip6_flowlabel_init();
 848         err = addrconf_init();
 849         if (err)
 850                 goto addrconf_fail;
 851
 852         /* Init v6 extension headers. */
 853         ipv6_rthdr_init();
 854         ipv6_frag_init();
 855         ipv6_nodata_init();
 856         ipv6_destopt_init();
 857 #ifdef CONFIG_IPV6_MIP6
 858         mip6_init();
 859 #endif
 860
 861         /* Init v6 transport protocols. */
 862         udpv6_init();
 863         udplitev6_init();
 864         tcpv6_init();
 865
 866         ipv6_packet_init();
 867         err = 0;
 868 out:
 869         return err;
 870
 871 addrconf_fail:
 872         ip6_flowlabel_cleanup();
 873         ip6_route_cleanup();
 874 #ifdef CONFIG_PROC_FS
 875         if6_proc_exit();
 876 proc_if6_fail:
 877         ac6_proc_exit();
 878 proc_anycast6_fail:
 879         ipv6_misc_proc_exit();
 880 proc_misc6_fail:
 881         udplite6_proc_exit();
 882 proc_udplite6_fail:
 883         udp6_proc_exit();
 884 proc_udp6_fail:
 885         tcp6_proc_exit();
 886 proc_tcp6_fail:
 887         raw6_proc_exit();
 888 proc_raw6_fail:
 889 #endif
 890         ipv6_netfilter_fini();
 891 netfilter_fail:
 892         igmp6_cleanup();
 893 igmp_fail:
 894         ndisc_cleanup();
 895 ndisc_fail:
 896         icmpv6_cleanup();
 897 icmp_fail:
 898 #ifdef CONFIG_SYSCTL
 899         ipv6_sysctl_unregister();
 900 #endif
 901         cleanup_ipv6_mibs();
 902 out_unregister_sock:
 903         sock_unregister(PF_INET6);
 904 out_unregister_raw_proto:
 905         proto_unregister(&rawv6_prot);
 906 out_unregister_udplite_proto:
 907         proto_unregister(&udplitev6_prot);
 908 out_unregister_udp_proto:
 909         proto_unregister(&udpv6_prot);
 910 out_unregister_tcp_proto:
 911         proto_unregister(&tcpv6_prot);
 912         goto out;
 913 }
 914 module_init(inet6_init);
 915
 916 static void __exit inet6_exit(void)
 917 {
 918         /* First of all disallow new sockets creation. */
 919         sock_unregister(PF_INET6);
 920         /* Disallow any further netlink messages */
 921         rtnl_unregister_all(PF_INET6);
 922
 923         /* Cleanup code parts. */
 924         ipv6_packet_cleanup();
 925 #ifdef CONFIG_IPV6_MIP6
 926         mip6_fini();
 927 #endif
 928         addrconf_cleanup();
 929         ip6_flowlabel_cleanup();
 930         ip6_route_cleanup();
 931 #ifdef CONFIG_PROC_FS
 932
 933         /* Cleanup code parts. */
 934         if6_proc_exit();
 935         ac6_proc_exit();
 936         ipv6_misc_proc_exit();
 937         udplite6_proc_exit();
 938         udp6_proc_exit();
 939         tcp6_proc_exit();
 940         raw6_proc_exit();
 941 #endif
 942         ipv6_netfilter_fini();
 943         igmp6_cleanup();
 944         ndisc_cleanup();
 945         icmpv6_cleanup();
 946 #ifdef CONFIG_SYSCTL
 947         ipv6_sysctl_unregister();
 948 #endif
 949         cleanup_ipv6_mibs();
 950         proto_unregister(&rawv6_prot);
 951         proto_unregister(&udplitev6_prot);
 952         proto_unregister(&udpv6_prot);
 953         proto_unregister(&tcpv6_prot);
 954 }
 955 module_exit(inet6_exit);
 956
 957 MODULE_ALIAS_NETPROTO(PF_INET6);