SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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
  62 #include <asm/uaccess.h>
  63 #include <asm/system.h>
  64
  65 MODULE_AUTHOR("Cast of dozens");
  66 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
  67 MODULE_LICENSE("GPL");
  68
  69 /* The inetsw6 table contains everything that inet6_create needs to
  70  * build a new socket.
  71  */
  72 static struct list_head inetsw6[SOCK_MAX];
  73 static DEFINE_SPINLOCK(inetsw6_lock);
  74
  75 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
  76 {
  77         const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
  78
  79         return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
  80 }
  81
  82 static int inet6_create(struct net *net, struct socket *sock, int protocol)
  83 {
  84         struct inet_sock *inet;
  85         struct ipv6_pinfo *np;
  86         struct sock *sk;
  87         struct list_head *p;
  88         struct inet_protosw *answer;
  89         struct proto *answer_prot;
  90         unsigned char answer_flags;
  91         char answer_no_check;
  92         int try_loading_module = 0;
  93         int err;
  94
  95         if (net != &init_net)
  96                 return -EAFNOSUPPORT;
  97
  98         if (sock->type != SOCK_RAW &&
  99             sock->type != SOCK_DGRAM &&
 100             !inet_ehash_secret)
 101                 build_ehash_secret();
 102
 103         /* Look for the requested type/protocol pair. */
 104         answer = NULL;
 105 lookup_protocol:
 106         err = -ESOCKTNOSUPPORT;
 107         rcu_read_lock();
 108         list_for_each_rcu(p, &inetsw6[sock->type]) {
 109                 answer = list_entry(p, struct inet_protosw, list);
 110
 111                 /* Check the non-wild match. */
 112                 if (protocol == answer->protocol) {
 113                         if (protocol != IPPROTO_IP)
 114                                 break;
 115                 } else {
 116                         /* Check for the two wild cases. */
 117                         if (IPPROTO_IP == protocol) {
 118                                 protocol = answer->protocol;
 119                                 break;
 120                         }
 121                         if (IPPROTO_IP == answer->protocol)
 122                                 break;
 123                 }
 124                 err = -EPROTONOSUPPORT;
 125                 answer = NULL;
 126         }
 127
 128         if (!answer) {
 129                 if (try_loading_module < 2) {
 130                         rcu_read_unlock();
 131                         /*
 132                          * Be more specific, e.g. net-pf-10-proto-132-type-1
 133                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
 134                          */
 135                         if (++try_loading_module == 1)
 136                                 request_module("net-pf-%d-proto-%d-type-%d",
 137                                                 PF_INET6, protocol, sock->type);
 138                         /*
 139                          * Fall back to generic, e.g. net-pf-10-proto-132
 140                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
 141                          */
 142                         else
 143                                 request_module("net-pf-%d-proto-%d",
 144                                                 PF_INET6, protocol);
 145                         goto lookup_protocol;
 146                 } else
 147                         goto out_rcu_unlock;
 148         }
 149
 150         err = -EPERM;
 151         if (answer->capability > 0 && !capable(answer->capability))
 152                 goto out_rcu_unlock;
 153
 154         sock->ops = answer->ops;
 155         answer_prot = answer->prot;
 156         answer_no_check = answer->no_check;
 157         answer_flags = answer->flags;
 158         rcu_read_unlock();
 159
 160         BUG_TRAP(answer_prot->slab != NULL);
 161
 162         err = -ENOBUFS;
 163         sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot);
 164         if (sk == NULL)
 165                 goto out;
 166
 167         sock_init_data(sock, sk);
 168
 169         err = 0;
 170         sk->sk_no_check = answer_no_check;
 171         if (INET_PROTOSW_REUSE & answer_flags)
 172                 sk->sk_reuse = 1;
 173
 174         inet = inet_sk(sk);
 175         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
 176
 177         if (SOCK_RAW == sock->type) {
 178                 inet->num = protocol;
 179                 if (IPPROTO_RAW == protocol)
 180                         inet->hdrincl = 1;
 181         }
 182
 183         sk->sk_destruct         = inet_sock_destruct;
 184         sk->sk_family           = PF_INET6;
 185         sk->sk_protocol         = protocol;
 186
 187         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
 188
 189         inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
 190         np->hop_limit   = -1;
 191         np->mcast_hops  = -1;
 192         np->mc_loop     = 1;
 193         np->pmtudisc    = IPV6_PMTUDISC_WANT;
 194         np->ipv6only    = init_net.ipv6.sysctl.bindv6only;
 195
 196         /* Init the ipv4 part of the socket since we can have sockets
 197          * using v6 API for ipv4.
 198          */
 199         inet->uc_ttl    = -1;
 200
 201         inet->mc_loop   = 1;
 202         inet->mc_ttl    = 1;
 203         inet->mc_index  = 0;
 204         inet->mc_list   = NULL;
 205
 206         if (ipv4_config.no_pmtu_disc)
 207                 inet->pmtudisc = IP_PMTUDISC_DONT;
 208         else
 209                 inet->pmtudisc = IP_PMTUDISC_WANT;
 210         /*
 211          * Increment only the relevant sk_prot->socks debug field, this changes
 212          * the previous behaviour of incrementing both the equivalent to
 213          * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
 214          *
 215          * This allows better debug granularity as we'll know exactly how many
 216          * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
 217          * transport protocol socks. -acme
 218          */
 219         sk_refcnt_debug_inc(sk);
 220
 221         if (inet->num) {
 222                 /* It assumes that any protocol which allows
 223                  * the user to assign a number at socket
 224                  * creation time automatically shares.
 225                  */
 226                 inet->sport = htons(inet->num);
 227                 sk->sk_prot->hash(sk);
 228         }
 229         if (sk->sk_prot->init) {
 230                 err = sk->sk_prot->init(sk);
 231                 if (err) {
 232                         sk_common_release(sk);
 233                         goto out;
 234                 }
 235         }
 236 out:
 237         return err;
 238 out_rcu_unlock:
 239         rcu_read_unlock();
 240         goto out;
 241 }
 242
 243
 244 /* bind for INET6 API */
 245 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 246 {
 247         struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
 248         struct sock *sk = sock->sk;
 249         struct inet_sock *inet = inet_sk(sk);
 250         struct ipv6_pinfo *np = inet6_sk(sk);
 251         __be32 v4addr = 0;
 252         unsigned short snum;
 253         int addr_type = 0;
 254         int err = 0;
 255
 256         /* If the socket has its own bind function then use it. */
 257         if (sk->sk_prot->bind)
 258                 return sk->sk_prot->bind(sk, uaddr, addr_len);
 259
 260         if (addr_len < SIN6_LEN_RFC2133)
 261                 return -EINVAL;
 262         addr_type = ipv6_addr_type(&addr->sin6_addr);
 263         if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
 264                 return -EINVAL;
 265
 266         snum = ntohs(addr->sin6_port);
 267         if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
 268                 return -EACCES;
 269
 270         lock_sock(sk);
 271
 272         /* Check these errors (active socket, double bind). */
 273         if (sk->sk_state != TCP_CLOSE || inet->num) {
 274                 err = -EINVAL;
 275                 goto out;
 276         }
 277
 278         /* Check if the address belongs to the host. */
 279         if (addr_type == IPV6_ADDR_MAPPED) {
 280                 v4addr = addr->sin6_addr.s6_addr32[3];
 281                 if (inet_addr_type(&init_net, v4addr) != RTN_LOCAL) {
 282                         err = -EADDRNOTAVAIL;
 283                         goto out;
 284                 }
 285         } else {
 286                 if (addr_type != IPV6_ADDR_ANY) {
 287                         struct net_device *dev = NULL;
 288
 289                         if (addr_type & IPV6_ADDR_LINKLOCAL) {
 290                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 291                                     addr->sin6_scope_id) {
 292                                         /* Override any existing binding, if another one
 293                                          * is supplied by user.
 294                                          */
 295                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
 296                                 }
 297
 298                                 /* Binding to link-local address requires an interface */
 299                                 if (!sk->sk_bound_dev_if) {
 300                                         err = -EINVAL;
 301                                         goto out;
 302                                 }
 303                                 dev = dev_get_by_index(&init_net, sk->sk_bound_dev_if);
 304                                 if (!dev) {
 305                                         err = -ENODEV;
 306                                         goto out;
 307                                 }
 308                         }
 309
 310                         /* ipv4 addr of the socket is invalid.  Only the
 311                          * unspecified and mapped address have a v4 equivalent.
 312                          */
 313                         v4addr = LOOPBACK4_IPV6;
 314                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
 315                                 if (!ipv6_chk_addr(&init_net, &addr->sin6_addr,
 316                                                    dev, 0)) {
 317                                         if (dev)
 318                                                 dev_put(dev);
 319                                         err = -EADDRNOTAVAIL;
 320                                         goto out;
 321                                 }
 322                         }
 323                         if (dev)
 324                                 dev_put(dev);
 325                 }
 326         }
 327
 328         inet->rcv_saddr = v4addr;
 329         inet->saddr = v4addr;
 330
 331         ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
 332
 333         if (!(addr_type & IPV6_ADDR_MULTICAST))
 334                 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
 335
 336         /* Make sure we are allowed to bind here. */
 337         if (sk->sk_prot->get_port(sk, snum)) {
 338                 inet_reset_saddr(sk);
 339                 err = -EADDRINUSE;
 340                 goto out;
 341         }
 342
 343         if (addr_type != IPV6_ADDR_ANY)
 344                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
 345         if (snum)
 346                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
 347         inet->sport = htons(inet->num);
 348         inet->dport = 0;
 349         inet->daddr = 0;
 350 out:
 351         release_sock(sk);
 352         return err;
 353 }
 354
 355 EXPORT_SYMBOL(inet6_bind);
 356
 357 int inet6_release(struct socket *sock)
 358 {
 359         struct sock *sk = sock->sk;
 360
 361         if (sk == NULL)
 362                 return -EINVAL;
 363
 364         /* Free mc lists */
 365         ipv6_sock_mc_close(sk);
 366
 367         /* Free ac lists */
 368         ipv6_sock_ac_close(sk);
 369
 370         return inet_release(sock);
 371 }
 372
 373 EXPORT_SYMBOL(inet6_release);
 374
 375 int inet6_destroy_sock(struct sock *sk)
 376 {
 377         struct ipv6_pinfo *np = inet6_sk(sk);
 378         struct sk_buff *skb;
 379         struct ipv6_txoptions *opt;
 380
 381         /* Release rx options */
 382
 383         if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
 384                 kfree_skb(skb);
 385
 386         /* Free flowlabels */
 387         fl6_free_socklist(sk);
 388
 389         /* Free tx options */
 390
 391         if ((opt = xchg(&np->opt, NULL)) != NULL)
 392                 sock_kfree_s(sk, opt, opt->tot_len);
 393
 394         return 0;
 395 }
 396
 397 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
 398
 399 /*
 400  *      This does both peername and sockname.
 401  */
 402
 403 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 404                  int *uaddr_len, int peer)
 405 {
 406         struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
 407         struct sock *sk = sock->sk;
 408         struct inet_sock *inet = inet_sk(sk);
 409         struct ipv6_pinfo *np = inet6_sk(sk);
 410
 411         sin->sin6_family = AF_INET6;
 412         sin->sin6_flowinfo = 0;
 413         sin->sin6_scope_id = 0;
 414         if (peer) {
 415                 if (!inet->dport)
 416                         return -ENOTCONN;
 417                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
 418                     peer == 1)
 419                         return -ENOTCONN;
 420                 sin->sin6_port = inet->dport;
 421                 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
 422                 if (np->sndflow)
 423                         sin->sin6_flowinfo = np->flow_label;
 424         } else {
 425                 if (ipv6_addr_any(&np->rcv_saddr))
 426                         ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
 427                 else
 428                         ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
 429
 430                 sin->sin6_port = inet->sport;
 431         }
 432         if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
 433                 sin->sin6_scope_id = sk->sk_bound_dev_if;
 434         *uaddr_len = sizeof(*sin);
 435         return(0);
 436 }
 437
 438 EXPORT_SYMBOL(inet6_getname);
 439
 440 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 441 {
 442         struct sock *sk = sock->sk;
 443         struct net *net = sk->sk_net;
 444
 445         switch(cmd)
 446         {
 447         case SIOCGSTAMP:
 448                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
 449
 450         case SIOCGSTAMPNS:
 451                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
 452
 453         case SIOCADDRT:
 454         case SIOCDELRT:
 455
 456                 return(ipv6_route_ioctl(net, cmd, (void __user *)arg));
 457
 458         case SIOCSIFADDR:
 459                 return addrconf_add_ifaddr((void __user *) arg);
 460         case SIOCDIFADDR:
 461                 return addrconf_del_ifaddr((void __user *) arg);
 462         case SIOCSIFDSTADDR:
 463                 return addrconf_set_dstaddr((void __user *) arg);
 464         default:
 465                 if (!sk->sk_prot->ioctl)
 466                         return -ENOIOCTLCMD;
 467                 return sk->sk_prot->ioctl(sk, cmd, arg);
 468         }
 469         /*NOTREACHED*/
 470         return(0);
 471 }
 472
 473 EXPORT_SYMBOL(inet6_ioctl);
 474
 475 const struct proto_ops inet6_stream_ops = {
 476         .family            = PF_INET6,
 477         .owner             = THIS_MODULE,
 478         .release           = inet6_release,
 479         .bind              = inet6_bind,
 480         .connect           = inet_stream_connect,       /* ok           */
 481         .socketpair        = sock_no_socketpair,        /* a do nothing */
 482         .accept            = inet_accept,               /* ok           */
 483         .getname           = inet6_getname,
 484         .poll              = tcp_poll,                  /* ok           */
 485         .ioctl             = inet6_ioctl,               /* must change  */
 486         .listen            = inet_listen,               /* ok           */
 487         .shutdown          = inet_shutdown,             /* ok           */
 488         .setsockopt        = sock_common_setsockopt,    /* ok           */
 489         .getsockopt        = sock_common_getsockopt,    /* ok           */
 490         .sendmsg           = tcp_sendmsg,               /* ok           */
 491         .recvmsg           = sock_common_recvmsg,       /* ok           */
 492         .mmap              = sock_no_mmap,
 493         .sendpage          = tcp_sendpage,
 494         .splice_read       = tcp_splice_read,
 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 int inet6_register_protosw(struct inet_protosw *p)
 533 {
 534         struct list_head *lh;
 535         struct inet_protosw *answer;
 536         struct list_head *last_perm;
 537         int protocol = p->protocol;
 538         int ret;
 539
 540         spin_lock_bh(&inetsw6_lock);
 541
 542         ret = -EINVAL;
 543         if (p->type >= SOCK_MAX)
 544                 goto out_illegal;
 545
 546         /* If we are trying to override a permanent protocol, bail. */
 547         answer = NULL;
 548         ret = -EPERM;
 549         last_perm = &inetsw6[p->type];
 550         list_for_each(lh, &inetsw6[p->type]) {
 551                 answer = list_entry(lh, struct inet_protosw, list);
 552
 553                 /* Check only the non-wild match. */
 554                 if (INET_PROTOSW_PERMANENT & answer->flags) {
 555                         if (protocol == answer->protocol)
 556                                 break;
 557                         last_perm = lh;
 558                 }
 559
 560                 answer = NULL;
 561         }
 562         if (answer)
 563                 goto out_permanent;
 564
 565         /* Add the new entry after the last permanent entry if any, so that
 566          * the new entry does not override a permanent entry when matched with
 567          * a wild-card protocol. But it is allowed to override any existing
 568          * non-permanent entry.  This means that when we remove this entry, the
 569          * system automatically returns to the old behavior.
 570          */
 571         list_add_rcu(&p->list, last_perm);
 572         ret = 0;
 573 out:
 574         spin_unlock_bh(&inetsw6_lock);
 575         return ret;
 576
 577 out_permanent:
 578         printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
 579                protocol);
 580         goto out;
 581
 582 out_illegal:
 583         printk(KERN_ERR
 584                "Ignoring attempt to register invalid socket type %d.\n",
 585                p->type);
 586         goto out;
 587 }
 588
 589 EXPORT_SYMBOL(inet6_register_protosw);
 590
 591 void
 592 inet6_unregister_protosw(struct inet_protosw *p)
 593 {
 594         if (INET_PROTOSW_PERMANENT & p->flags) {
 595                 printk(KERN_ERR
 596                        "Attempt to unregister permanent protocol %d.\n",
 597                        p->protocol);
 598         } else {
 599                 spin_lock_bh(&inetsw6_lock);
 600                 list_del_rcu(&p->list);
 601                 spin_unlock_bh(&inetsw6_lock);
 602
 603                 synchronize_net();
 604         }
 605 }
 606
 607 EXPORT_SYMBOL(inet6_unregister_protosw);
 608
 609 int inet6_sk_rebuild_header(struct sock *sk)
 610 {
 611         int err;
 612         struct dst_entry *dst;
 613         struct ipv6_pinfo *np = inet6_sk(sk);
 614
 615         dst = __sk_dst_check(sk, np->dst_cookie);
 616
 617         if (dst == NULL) {
 618                 struct inet_sock *inet = inet_sk(sk);
 619                 struct in6_addr *final_p = NULL, final;
 620                 struct flowi fl;
 621
 622                 memset(&fl, 0, sizeof(fl));
 623                 fl.proto = sk->sk_protocol;
 624                 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 625                 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
 626                 fl.fl6_flowlabel = np->flow_label;
 627                 fl.oif = sk->sk_bound_dev_if;
 628                 fl.fl_ip_dport = inet->dport;
 629                 fl.fl_ip_sport = inet->sport;
 630                 security_sk_classify_flow(sk, &fl);
 631
 632                 if (np->opt && np->opt->srcrt) {
 633                         struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
 634                         ipv6_addr_copy(&final, &fl.fl6_dst);
 635                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 636                         final_p = &final;
 637                 }
 638
 639                 err = ip6_dst_lookup(sk, &dst, &fl);
 640                 if (err) {
 641                         sk->sk_route_caps = 0;
 642                         return err;
 643                 }
 644                 if (final_p)
 645                         ipv6_addr_copy(&fl.fl6_dst, final_p);
 646
 647                 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
 648                         sk->sk_err_soft = -err;
 649                         return err;
 650                 }
 651
 652                 __ip6_dst_store(sk, dst, NULL, NULL);
 653         }
 654
 655         return 0;
 656 }
 657
 658 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
 659
 660 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
 661 {
 662         struct ipv6_pinfo *np = inet6_sk(sk);
 663         struct inet6_skb_parm *opt = IP6CB(skb);
 664
 665         if (np->rxopt.all) {
 666                 if ((opt->hop && (np->rxopt.bits.hopopts ||
 667                                   np->rxopt.bits.ohopopts)) ||
 668                     ((IPV6_FLOWINFO_MASK &
 669                       *(__be32 *)skb_network_header(skb)) &&
 670                      np->rxopt.bits.rxflow) ||
 671                     (opt->srcrt && (np->rxopt.bits.srcrt ||
 672                      np->rxopt.bits.osrcrt)) ||
 673                     ((opt->dst1 || opt->dst0) &&
 674                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
 675                         return 1;
 676         }
 677         return 0;
 678 }
 679
 680 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
 681
 682 static struct inet6_protocol *ipv6_gso_pull_exthdrs(struct sk_buff *skb,
 683                                                     int proto)
 684 {
 685         struct inet6_protocol *ops = NULL;
 686
 687         for (;;) {
 688                 struct ipv6_opt_hdr *opth;
 689                 int len;
 690
 691                 if (proto != NEXTHDR_HOP) {
 692                         ops = rcu_dereference(inet6_protos[proto]);
 693
 694                         if (unlikely(!ops))
 695                                 break;
 696
 697                         if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
 698                                 break;
 699                 }
 700
 701                 if (unlikely(!pskb_may_pull(skb, 8)))
 702                         break;
 703
 704                 opth = (void *)skb->data;
 705                 len = ipv6_optlen(opth);
 706
 707                 if (unlikely(!pskb_may_pull(skb, len)))
 708                         break;
 709
 710                 proto = opth->nexthdr;
 711                 __skb_pull(skb, len);
 712         }
 713
 714         return ops;
 715 }
 716
 717 static int ipv6_gso_send_check(struct sk_buff *skb)
 718 {
 719         struct ipv6hdr *ipv6h;
 720         struct inet6_protocol *ops;
 721         int err = -EINVAL;
 722
 723         if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
 724                 goto out;
 725
 726         ipv6h = ipv6_hdr(skb);
 727         __skb_pull(skb, sizeof(*ipv6h));
 728         err = -EPROTONOSUPPORT;
 729
 730         rcu_read_lock();
 731         ops = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
 732         if (likely(ops && ops->gso_send_check)) {
 733                 skb_reset_transport_header(skb);
 734                 err = ops->gso_send_check(skb);
 735         }
 736         rcu_read_unlock();
 737
 738 out:
 739         return err;
 740 }
 741
 742 static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features)
 743 {
 744         struct sk_buff *segs = ERR_PTR(-EINVAL);
 745         struct ipv6hdr *ipv6h;
 746         struct inet6_protocol *ops;
 747
 748         if (!(features & NETIF_F_V6_CSUM))
 749                 features &= ~NETIF_F_SG;
 750
 751         if (unlikely(skb_shinfo(skb)->gso_type &
 752                      ~(SKB_GSO_UDP |
 753                        SKB_GSO_DODGY |
 754                        SKB_GSO_TCP_ECN |
 755                        SKB_GSO_TCPV6 |
 756                        0)))
 757                 goto out;
 758
 759         if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
 760                 goto out;
 761
 762         ipv6h = ipv6_hdr(skb);
 763         __skb_pull(skb, sizeof(*ipv6h));
 764         segs = ERR_PTR(-EPROTONOSUPPORT);
 765
 766         rcu_read_lock();
 767         ops = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
 768         if (likely(ops && ops->gso_segment)) {
 769                 skb_reset_transport_header(skb);
 770                 segs = ops->gso_segment(skb, features);
 771         }
 772         rcu_read_unlock();
 773
 774         if (unlikely(IS_ERR(segs)))
 775                 goto out;
 776
 777         for (skb = segs; skb; skb = skb->next) {
 778                 ipv6h = ipv6_hdr(skb);
 779                 ipv6h->payload_len = htons(skb->len - skb->mac_len -
 780                                            sizeof(*ipv6h));
 781         }
 782
 783 out:
 784         return segs;
 785 }
 786
 787 static struct packet_type ipv6_packet_type = {
 788         .type = __constant_htons(ETH_P_IPV6),
 789         .func = ipv6_rcv,
 790         .gso_send_check = ipv6_gso_send_check,
 791         .gso_segment = ipv6_gso_segment,
 792 };
 793
 794 static int __init ipv6_packet_init(void)
 795 {
 796         dev_add_pack(&ipv6_packet_type);
 797         return 0;
 798 }
 799
 800 static void ipv6_packet_cleanup(void)
 801 {
 802         dev_remove_pack(&ipv6_packet_type);
 803 }
 804
 805 static int __init init_ipv6_mibs(void)
 806 {
 807         if (snmp_mib_init((void **)ipv6_statistics,
 808                           sizeof(struct ipstats_mib)) < 0)
 809                 goto err_ip_mib;
 810         if (snmp_mib_init((void **)icmpv6_statistics,
 811                           sizeof(struct icmpv6_mib)) < 0)
 812                 goto err_icmp_mib;
 813         if (snmp_mib_init((void **)icmpv6msg_statistics,
 814                           sizeof(struct icmpv6msg_mib)) < 0)
 815                 goto err_icmpmsg_mib;
 816         if (snmp_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib)) < 0)
 817                 goto err_udp_mib;
 818 #ifdef CONFIG_IP_UDPLITE
 819         if (snmp_mib_init((void **)udplite_stats_in6,
 820                           sizeof (struct udp_mib)) < 0)
 821                 goto err_udplite_mib;
 822 #endif
 823         return 0;
 824
 825 #ifdef CONFIG_IP_UDPLITE
 826 err_udplite_mib:
 827 #endif
 828         snmp_mib_free((void **)udp_stats_in6);
 829 err_udp_mib:
 830         snmp_mib_free((void **)icmpv6msg_statistics);
 831 err_icmpmsg_mib:
 832         snmp_mib_free((void **)icmpv6_statistics);
 833 err_icmp_mib:
 834         snmp_mib_free((void **)ipv6_statistics);
 835 err_ip_mib:
 836         return -ENOMEM;
 837
 838 }
 839
 840 static void cleanup_ipv6_mibs(void)
 841 {
 842         snmp_mib_free((void **)ipv6_statistics);
 843         snmp_mib_free((void **)icmpv6_statistics);
 844         snmp_mib_free((void **)icmpv6msg_statistics);
 845         snmp_mib_free((void **)udp_stats_in6);
 846 #ifdef CONFIG_IP_UDPLITE
 847         snmp_mib_free((void **)udplite_stats_in6);
 848 #endif
 849 }
 850
 851 static int inet6_net_init(struct net *net)
 852 {
 853         net->ipv6.sysctl.bindv6only = 0;
 854         net->ipv6.sysctl.flush_delay = 0;
 855         net->ipv6.sysctl.ip6_rt_max_size = 4096;
 856         net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
 857         net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
 858         net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
 859         net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
 860         net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
 861         net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
 862         net->ipv6.sysctl.icmpv6_time = 1*HZ;
 863
 864         return 0;
 865 }
 866
 867 static void inet6_net_exit(struct net *net)
 868 {
 869         return;
 870 }
 871
 872 static struct pernet_operations inet6_net_ops = {
 873         .init = inet6_net_init,
 874         .exit = inet6_net_exit,
 875 };
 876
 877 static int __init inet6_init(void)
 878 {
 879         struct sk_buff *dummy_skb;
 880         struct list_head *r;
 881         int err;
 882
 883         BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
 884
 885         err = proto_register(&tcpv6_prot, 1);
 886         if (err)
 887                 goto out;
 888
 889         err = proto_register(&udpv6_prot, 1);
 890         if (err)
 891                 goto out_unregister_tcp_proto;
 892
 893 #ifdef CONFIG_IP_UDPLITE
 894         err = proto_register(&udplitev6_prot, 1);
 895         if (err)
 896                 goto out_unregister_udp_proto;
 897 #endif
 898
 899         err = proto_register(&rawv6_prot, 1);
 900         if (err)
 901                 goto out_unregister_udplite_proto;
 902
 903
 904         /* Register the socket-side information for inet6_create.  */
 905         for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
 906                 INIT_LIST_HEAD(r);
 907
 908         /* We MUST register RAW sockets before we create the ICMP6,
 909          * IGMP6, or NDISC control sockets.
 910          */
 911         err = rawv6_init();
 912         if (err)
 913                 goto out_unregister_raw_proto;
 914
 915         /* Register the family here so that the init calls below will
 916          * be able to create sockets. (?? is this dangerous ??)
 917          */
 918         err = sock_register(&inet6_family_ops);
 919         if (err)
 920                 goto out_sock_register_fail;
 921
 922         /* Initialise ipv6 mibs */
 923         err = init_ipv6_mibs();
 924         if (err)
 925                 goto out_unregister_sock;
 926
 927         /*
 928          *      ipngwg API draft makes clear that the correct semantics
 929          *      for TCP and UDP is to consider one TCP and UDP instance
 930          *      in a host availiable by both INET and INET6 APIs and
 931          *      able to communicate via both network protocols.
 932          */
 933
 934         err = register_pernet_subsys(&inet6_net_ops);
 935         if (err)
 936                 goto register_pernet_fail;
 937         err = icmpv6_init();
 938         if (err)
 939                 goto icmp_fail;
 940         err = ndisc_init();
 941         if (err)
 942                 goto ndisc_fail;
 943         err = igmp6_init();
 944         if (err)
 945                 goto igmp_fail;
 946         err = ipv6_netfilter_init();
 947         if (err)
 948                 goto netfilter_fail;
 949         /* Create /proc/foo6 entries. */
 950 #ifdef CONFIG_PROC_FS
 951         err = -ENOMEM;
 952         if (raw6_proc_init())
 953                 goto proc_raw6_fail;
 954         if (tcp6_proc_init())
 955                 goto proc_tcp6_fail;
 956         if (udp6_proc_init())
 957                 goto proc_udp6_fail;
 958         if (udplite6_proc_init())
 959                 goto proc_udplite6_fail;
 960         if (ipv6_misc_proc_init())
 961                 goto proc_misc6_fail;
 962
 963         if (ac6_proc_init())
 964                 goto proc_anycast6_fail;
 965         if (if6_proc_init())
 966                 goto proc_if6_fail;
 967 #endif
 968         err = ip6_route_init();
 969         if (err)
 970                 goto ip6_route_fail;
 971         err = ip6_flowlabel_init();
 972         if (err)
 973                 goto ip6_flowlabel_fail;
 974         err = addrconf_init();
 975         if (err)
 976                 goto addrconf_fail;
 977
 978         /* Init v6 extension headers. */
 979         err = ipv6_exthdrs_init();
 980         if (err)
 981                 goto ipv6_exthdrs_fail;
 982
 983         err = ipv6_frag_init();
 984         if (err)
 985                 goto ipv6_frag_fail;
 986
 987         /* Init v6 transport protocols. */
 988         err = udpv6_init();
 989         if (err)
 990                 goto udpv6_fail;
 991
 992         err = udplitev6_init();
 993         if (err)
 994                 goto udplitev6_fail;
 995
 996         err = tcpv6_init();
 997         if (err)
 998                 goto tcpv6_fail;
 999
1000         err = ipv6_packet_init();
1001         if (err)
1002                 goto ipv6_packet_fail;
1003
1004 #ifdef CONFIG_SYSCTL
1005         err = ipv6_sysctl_register();
1006         if (err)
1007                 goto sysctl_fail;
1008 #endif
1009 out:
1010         return err;
1011
1012 #ifdef CONFIG_SYSCTL
1013 sysctl_fail:
1014         ipv6_packet_cleanup();
1015 #endif
1016 ipv6_packet_fail:
1017         tcpv6_exit();
1018 tcpv6_fail:
1019         udplitev6_exit();
1020 udplitev6_fail:
1021         udpv6_exit();
1022 udpv6_fail:
1023         ipv6_frag_exit();
1024 ipv6_frag_fail:
1025         ipv6_exthdrs_exit();
1026 ipv6_exthdrs_fail:
1027         addrconf_cleanup();
1028 addrconf_fail:
1029         ip6_flowlabel_cleanup();
1030 ip6_flowlabel_fail:
1031         ip6_route_cleanup();
1032 ip6_route_fail:
1033 #ifdef CONFIG_PROC_FS
1034         if6_proc_exit();
1035 proc_if6_fail:
1036         ac6_proc_exit();
1037 proc_anycast6_fail:
1038         ipv6_misc_proc_exit();
1039 proc_misc6_fail:
1040         udplite6_proc_exit();
1041 proc_udplite6_fail:
1042         udp6_proc_exit();
1043 proc_udp6_fail:
1044         tcp6_proc_exit();
1045 proc_tcp6_fail:
1046         raw6_proc_exit();
1047 proc_raw6_fail:
1048 #endif
1049         ipv6_netfilter_fini();
1050 netfilter_fail:
1051         igmp6_cleanup();
1052 igmp_fail:
1053         ndisc_cleanup();
1054 ndisc_fail:
1055         icmpv6_cleanup();
1056 icmp_fail:
1057         unregister_pernet_subsys(&inet6_net_ops);
1058 register_pernet_fail:
1059         cleanup_ipv6_mibs();
1060 out_unregister_sock:
1061         sock_unregister(PF_INET6);
1062         rtnl_unregister_all(PF_INET6);
1063 out_sock_register_fail:
1064         rawv6_exit();
1065 out_unregister_raw_proto:
1066         proto_unregister(&rawv6_prot);
1067 out_unregister_udplite_proto:
1068 #ifdef CONFIG_IP_UDPLITE
1069         proto_unregister(&udplitev6_prot);
1070 out_unregister_udp_proto:
1071 #endif
1072         proto_unregister(&udpv6_prot);
1073 out_unregister_tcp_proto:
1074         proto_unregister(&tcpv6_prot);
1075         goto out;
1076 }
1077 module_init(inet6_init);
1078
1079 static void __exit inet6_exit(void)
1080 {
1081         /* First of all disallow new sockets creation. */
1082         sock_unregister(PF_INET6);
1083         /* Disallow any further netlink messages */
1084         rtnl_unregister_all(PF_INET6);
1085
1086 #ifdef CONFIG_SYSCTL
1087         ipv6_sysctl_unregister();
1088 #endif
1089         udpv6_exit();
1090 #ifdef CONFIG_IP_UDPLITE
1091         udplitev6_exit();
1092 #endif
1093         tcpv6_exit();
1094
1095         /* Cleanup code parts. */
1096         ipv6_packet_cleanup();
1097         ipv6_frag_exit();
1098         ipv6_exthdrs_exit();
1099         addrconf_cleanup();
1100         ip6_flowlabel_cleanup();
1101         ip6_route_cleanup();
1102 #ifdef CONFIG_PROC_FS
1103
1104         /* Cleanup code parts. */
1105         if6_proc_exit();
1106         ac6_proc_exit();
1107         ipv6_misc_proc_exit();
1108         udplite6_proc_exit();
1109         udp6_proc_exit();
1110         tcp6_proc_exit();
1111         raw6_proc_exit();
1112 #endif
1113         ipv6_netfilter_fini();
1114         igmp6_cleanup();
1115         ndisc_cleanup();
1116         icmpv6_cleanup();
1117         rawv6_exit();
1118
1119         unregister_pernet_subsys(&inet6_net_ops);
1120         cleanup_ipv6_mibs();
1121         proto_unregister(&rawv6_prot);
1122 #ifdef CONFIG_IP_UDPLITE
1123         proto_unregister(&udplitev6_prot);
1124 #endif
1125         proto_unregister(&udpv6_prot);
1126         proto_unregister(&tcpv6_prot);
1127 }
1128 module_exit(inet6_exit);
1129
1130 MODULE_ALIAS_NETPROTO(PF_INET6);