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(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(&addr->sin6_addr, dev, 0)) {
 316                                         if (dev)
 317                                                 dev_put(dev);
 318                                         err = -EADDRNOTAVAIL;
 319                                         goto out;
 320                                 }
 321                         }
 322                         if (dev)
 323                                 dev_put(dev);
 324                 }
 325         }
 326
 327         inet->rcv_saddr = v4addr;
 328         inet->saddr = v4addr;
 329
 330         ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
 331
 332         if (!(addr_type & IPV6_ADDR_MULTICAST))
 333                 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
 334
 335         /* Make sure we are allowed to bind here. */
 336         if (sk->sk_prot->get_port(sk, snum)) {
 337                 inet_reset_saddr(sk);
 338                 err = -EADDRINUSE;
 339                 goto out;
 340         }
 341
 342         if (addr_type != IPV6_ADDR_ANY)
 343                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
 344         if (snum)
 345                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
 346         inet->sport = htons(inet->num);
 347         inet->dport = 0;
 348         inet->daddr = 0;
 349 out:
 350         release_sock(sk);
 351         return err;
 352 }
 353
 354 EXPORT_SYMBOL(inet6_bind);
 355
 356 int inet6_release(struct socket *sock)
 357 {
 358         struct sock *sk = sock->sk;
 359
 360         if (sk == NULL)
 361                 return -EINVAL;
 362
 363         /* Free mc lists */
 364         ipv6_sock_mc_close(sk);
 365
 366         /* Free ac lists */
 367         ipv6_sock_ac_close(sk);
 368
 369         return inet_release(sock);
 370 }
 371
 372 EXPORT_SYMBOL(inet6_release);
 373
 374 int inet6_destroy_sock(struct sock *sk)
 375 {
 376         struct ipv6_pinfo *np = inet6_sk(sk);
 377         struct sk_buff *skb;
 378         struct ipv6_txoptions *opt;
 379
 380         /* Release rx options */
 381
 382         if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
 383                 kfree_skb(skb);
 384
 385         /* Free flowlabels */
 386         fl6_free_socklist(sk);
 387
 388         /* Free tx options */
 389
 390         if ((opt = xchg(&np->opt, NULL)) != NULL)
 391                 sock_kfree_s(sk, opt, opt->tot_len);
 392
 393         return 0;
 394 }
 395
 396 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
 397
 398 /*
 399  *      This does both peername and sockname.
 400  */
 401
 402 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 403                  int *uaddr_len, int peer)
 404 {
 405         struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
 406         struct sock *sk = sock->sk;
 407         struct inet_sock *inet = inet_sk(sk);
 408         struct ipv6_pinfo *np = inet6_sk(sk);
 409
 410         sin->sin6_family = AF_INET6;
 411         sin->sin6_flowinfo = 0;
 412         sin->sin6_scope_id = 0;
 413         if (peer) {
 414                 if (!inet->dport)
 415                         return -ENOTCONN;
 416                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
 417                     peer == 1)
 418                         return -ENOTCONN;
 419                 sin->sin6_port = inet->dport;
 420                 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
 421                 if (np->sndflow)
 422                         sin->sin6_flowinfo = np->flow_label;
 423         } else {
 424                 if (ipv6_addr_any(&np->rcv_saddr))
 425                         ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
 426                 else
 427                         ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
 428
 429                 sin->sin6_port = inet->sport;
 430         }
 431         if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
 432                 sin->sin6_scope_id = sk->sk_bound_dev_if;
 433         *uaddr_len = sizeof(*sin);
 434         return(0);
 435 }
 436
 437 EXPORT_SYMBOL(inet6_getname);
 438
 439 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 440 {
 441         struct sock *sk = sock->sk;
 442
 443         switch(cmd)
 444         {
 445         case SIOCGSTAMP:
 446                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
 447
 448         case SIOCGSTAMPNS:
 449                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
 450
 451         case SIOCADDRT:
 452         case SIOCDELRT:
 453
 454                 return(ipv6_route_ioctl(cmd,(void __user *)arg));
 455
 456         case SIOCSIFADDR:
 457                 return addrconf_add_ifaddr((void __user *) arg);
 458         case SIOCDIFADDR:
 459                 return addrconf_del_ifaddr((void __user *) arg);
 460         case SIOCSIFDSTADDR:
 461                 return addrconf_set_dstaddr((void __user *) arg);
 462         default:
 463                 if (!sk->sk_prot->ioctl)
 464                         return -ENOIOCTLCMD;
 465                 return sk->sk_prot->ioctl(sk, cmd, arg);
 466         }
 467         /*NOTREACHED*/
 468         return(0);
 469 }
 470
 471 EXPORT_SYMBOL(inet6_ioctl);
 472
 473 const struct proto_ops inet6_stream_ops = {
 474         .family            = PF_INET6,
 475         .owner             = THIS_MODULE,
 476         .release           = inet6_release,
 477         .bind              = inet6_bind,
 478         .connect           = inet_stream_connect,       /* ok           */
 479         .socketpair        = sock_no_socketpair,        /* a do nothing */
 480         .accept            = inet_accept,               /* ok           */
 481         .getname           = inet6_getname,
 482         .poll              = tcp_poll,                  /* ok           */
 483         .ioctl             = inet6_ioctl,               /* must change  */
 484         .listen            = inet_listen,               /* ok           */
 485         .shutdown          = inet_shutdown,             /* ok           */
 486         .setsockopt        = sock_common_setsockopt,    /* ok           */
 487         .getsockopt        = sock_common_getsockopt,    /* ok           */
 488         .sendmsg           = tcp_sendmsg,               /* ok           */
 489         .recvmsg           = sock_common_recvmsg,       /* ok           */
 490         .mmap              = sock_no_mmap,
 491         .sendpage          = tcp_sendpage,
 492         .splice_read       = tcp_splice_read,
 493 #ifdef CONFIG_COMPAT
 494         .compat_setsockopt = compat_sock_common_setsockopt,
 495         .compat_getsockopt = compat_sock_common_getsockopt,
 496 #endif
 497 };
 498
 499 const struct proto_ops inet6_dgram_ops = {
 500         .family            = PF_INET6,
 501         .owner             = THIS_MODULE,
 502         .release           = inet6_release,
 503         .bind              = inet6_bind,
 504         .connect           = inet_dgram_connect,        /* ok           */
 505         .socketpair        = sock_no_socketpair,        /* a do nothing */
 506         .accept            = sock_no_accept,            /* a do nothing */
 507         .getname           = inet6_getname,
 508         .poll              = udp_poll,                  /* ok           */
 509         .ioctl             = inet6_ioctl,               /* must change  */
 510         .listen            = sock_no_listen,            /* ok           */
 511         .shutdown          = inet_shutdown,             /* ok           */
 512         .setsockopt        = sock_common_setsockopt,    /* ok           */
 513         .getsockopt        = sock_common_getsockopt,    /* ok           */
 514         .sendmsg           = inet_sendmsg,              /* ok           */
 515         .recvmsg           = sock_common_recvmsg,       /* ok           */
 516         .mmap              = sock_no_mmap,
 517         .sendpage          = sock_no_sendpage,
 518 #ifdef CONFIG_COMPAT
 519         .compat_setsockopt = compat_sock_common_setsockopt,
 520         .compat_getsockopt = compat_sock_common_getsockopt,
 521 #endif
 522 };
 523
 524 static struct net_proto_family inet6_family_ops = {
 525         .family = PF_INET6,
 526         .create = inet6_create,
 527         .owner  = THIS_MODULE,
 528 };
 529
 530 int inet6_register_protosw(struct inet_protosw *p)
 531 {
 532         struct list_head *lh;
 533         struct inet_protosw *answer;
 534         struct list_head *last_perm;
 535         int protocol = p->protocol;
 536         int ret;
 537
 538         spin_lock_bh(&inetsw6_lock);
 539
 540         ret = -EINVAL;
 541         if (p->type >= SOCK_MAX)
 542                 goto out_illegal;
 543
 544         /* If we are trying to override a permanent protocol, bail. */
 545         answer = NULL;
 546         ret = -EPERM;
 547         last_perm = &inetsw6[p->type];
 548         list_for_each(lh, &inetsw6[p->type]) {
 549                 answer = list_entry(lh, struct inet_protosw, list);
 550
 551                 /* Check only the non-wild match. */
 552                 if (INET_PROTOSW_PERMANENT & answer->flags) {
 553                         if (protocol == answer->protocol)
 554                                 break;
 555                         last_perm = lh;
 556                 }
 557
 558                 answer = NULL;
 559         }
 560         if (answer)
 561                 goto out_permanent;
 562
 563         /* Add the new entry after the last permanent entry if any, so that
 564          * the new entry does not override a permanent entry when matched with
 565          * a wild-card protocol. But it is allowed to override any existing
 566          * non-permanent entry.  This means that when we remove this entry, the
 567          * system automatically returns to the old behavior.
 568          */
 569         list_add_rcu(&p->list, last_perm);
 570         ret = 0;
 571 out:
 572         spin_unlock_bh(&inetsw6_lock);
 573         return ret;
 574
 575 out_permanent:
 576         printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
 577                protocol);
 578         goto out;
 579
 580 out_illegal:
 581         printk(KERN_ERR
 582                "Ignoring attempt to register invalid socket type %d.\n",
 583                p->type);
 584         goto out;
 585 }
 586
 587 EXPORT_SYMBOL(inet6_register_protosw);
 588
 589 void
 590 inet6_unregister_protosw(struct inet_protosw *p)
 591 {
 592         if (INET_PROTOSW_PERMANENT & p->flags) {
 593                 printk(KERN_ERR
 594                        "Attempt to unregister permanent protocol %d.\n",
 595                        p->protocol);
 596         } else {
 597                 spin_lock_bh(&inetsw6_lock);
 598                 list_del_rcu(&p->list);
 599                 spin_unlock_bh(&inetsw6_lock);
 600
 601                 synchronize_net();
 602         }
 603 }
 604
 605 EXPORT_SYMBOL(inet6_unregister_protosw);
 606
 607 int inet6_sk_rebuild_header(struct sock *sk)
 608 {
 609         int err;
 610         struct dst_entry *dst;
 611         struct ipv6_pinfo *np = inet6_sk(sk);
 612
 613         dst = __sk_dst_check(sk, np->dst_cookie);
 614
 615         if (dst == NULL) {
 616                 struct inet_sock *inet = inet_sk(sk);
 617                 struct in6_addr *final_p = NULL, final;
 618                 struct flowi fl;
 619
 620                 memset(&fl, 0, sizeof(fl));
 621                 fl.proto = sk->sk_protocol;
 622                 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 623                 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
 624                 fl.fl6_flowlabel = np->flow_label;
 625                 fl.oif = sk->sk_bound_dev_if;
 626                 fl.fl_ip_dport = inet->dport;
 627                 fl.fl_ip_sport = inet->sport;
 628                 security_sk_classify_flow(sk, &fl);
 629
 630                 if (np->opt && np->opt->srcrt) {
 631                         struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
 632                         ipv6_addr_copy(&final, &fl.fl6_dst);
 633                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 634                         final_p = &final;
 635                 }
 636
 637                 err = ip6_dst_lookup(sk, &dst, &fl);
 638                 if (err) {
 639                         sk->sk_route_caps = 0;
 640                         return err;
 641                 }
 642                 if (final_p)
 643                         ipv6_addr_copy(&fl.fl6_dst, final_p);
 644
 645                 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
 646                         sk->sk_err_soft = -err;
 647                         return err;
 648                 }
 649
 650                 __ip6_dst_store(sk, dst, NULL, NULL);
 651         }
 652
 653         return 0;
 654 }
 655
 656 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
 657
 658 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
 659 {
 660         struct ipv6_pinfo *np = inet6_sk(sk);
 661         struct inet6_skb_parm *opt = IP6CB(skb);
 662
 663         if (np->rxopt.all) {
 664                 if ((opt->hop && (np->rxopt.bits.hopopts ||
 665                                   np->rxopt.bits.ohopopts)) ||
 666                     ((IPV6_FLOWINFO_MASK &
 667                       *(__be32 *)skb_network_header(skb)) &&
 668                      np->rxopt.bits.rxflow) ||
 669                     (opt->srcrt && (np->rxopt.bits.srcrt ||
 670                      np->rxopt.bits.osrcrt)) ||
 671                     ((opt->dst1 || opt->dst0) &&
 672                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
 673                         return 1;
 674         }
 675         return 0;
 676 }
 677
 678 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
 679
 680 static int __init init_ipv6_mibs(void)
 681 {
 682         if (snmp_mib_init((void **)ipv6_statistics,
 683                           sizeof(struct ipstats_mib)) < 0)
 684                 goto err_ip_mib;
 685         if (snmp_mib_init((void **)icmpv6_statistics,
 686                           sizeof(struct icmpv6_mib)) < 0)
 687                 goto err_icmp_mib;
 688         if (snmp_mib_init((void **)icmpv6msg_statistics,
 689                           sizeof(struct icmpv6msg_mib)) < 0)
 690                 goto err_icmpmsg_mib;
 691         if (snmp_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib)) < 0)
 692                 goto err_udp_mib;
 693         if (snmp_mib_init((void **)udplite_stats_in6,
 694                           sizeof (struct udp_mib)) < 0)
 695                 goto err_udplite_mib;
 696         return 0;
 697
 698 err_udplite_mib:
 699         snmp_mib_free((void **)udp_stats_in6);
 700 err_udp_mib:
 701         snmp_mib_free((void **)icmpv6msg_statistics);
 702 err_icmpmsg_mib:
 703         snmp_mib_free((void **)icmpv6_statistics);
 704 err_icmp_mib:
 705         snmp_mib_free((void **)ipv6_statistics);
 706 err_ip_mib:
 707         return -ENOMEM;
 708
 709 }
 710
 711 static void cleanup_ipv6_mibs(void)
 712 {
 713         snmp_mib_free((void **)ipv6_statistics);
 714         snmp_mib_free((void **)icmpv6_statistics);
 715         snmp_mib_free((void **)icmpv6msg_statistics);
 716         snmp_mib_free((void **)udp_stats_in6);
 717         snmp_mib_free((void **)udplite_stats_in6);
 718 }
 719
 720 static int inet6_net_init(struct net *net)
 721 {
 722         net->ipv6.sysctl.bindv6only = 0;
 723         return 0;
 724 }
 725
 726 static void inet6_net_exit(struct net *net)
 727 {
 728         return;
 729 }
 730
 731 static struct pernet_operations inet6_net_ops = {
 732         .init = inet6_net_init,
 733         .exit = inet6_net_exit,
 734 };
 735
 736 static int __init inet6_init(void)
 737 {
 738         struct sk_buff *dummy_skb;
 739         struct list_head *r;
 740         int err;
 741
 742         BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
 743
 744 #ifdef MODULE
 745 #if 0 /* FIXME --RR */
 746         if (!mod_member_present(&__this_module, can_unload))
 747           return -EINVAL;
 748
 749         __this_module.can_unload = &ipv6_unload;
 750 #endif
 751 #endif
 752         err = proto_register(&tcpv6_prot, 1);
 753         if (err)
 754                 goto out;
 755
 756         err = proto_register(&udpv6_prot, 1);
 757         if (err)
 758                 goto out_unregister_tcp_proto;
 759
 760         err = proto_register(&udplitev6_prot, 1);
 761         if (err)
 762                 goto out_unregister_udp_proto;
 763
 764         err = proto_register(&rawv6_prot, 1);
 765         if (err)
 766                 goto out_unregister_udplite_proto;
 767
 768
 769         /* Register the socket-side information for inet6_create.  */
 770         for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
 771                 INIT_LIST_HEAD(r);
 772
 773         /* We MUST register RAW sockets before we create the ICMP6,
 774          * IGMP6, or NDISC control sockets.
 775          */
 776         err = rawv6_init();
 777         if (err)
 778                 goto out_unregister_raw_proto;
 779
 780         /* Register the family here so that the init calls below will
 781          * be able to create sockets. (?? is this dangerous ??)
 782          */
 783         err = sock_register(&inet6_family_ops);
 784         if (err)
 785                 goto out_sock_register_fail;
 786
 787         /* Initialise ipv6 mibs */
 788         err = init_ipv6_mibs();
 789         if (err)
 790                 goto out_unregister_sock;
 791
 792         /*
 793          *      ipngwg API draft makes clear that the correct semantics
 794          *      for TCP and UDP is to consider one TCP and UDP instance
 795          *      in a host availiable by both INET and INET6 APIs and
 796          *      able to communicate via both network protocols.
 797          */
 798
 799         err = register_pernet_subsys(&inet6_net_ops);
 800         if (err)
 801                 goto register_pernet_fail;
 802
 803 #ifdef CONFIG_SYSCTL
 804         err = ipv6_sysctl_register();
 805         if (err)
 806                 goto sysctl_fail;
 807 #endif
 808         err = icmpv6_init(&inet6_family_ops);
 809         if (err)
 810                 goto icmp_fail;
 811         err = ndisc_init(&inet6_family_ops);
 812         if (err)
 813                 goto ndisc_fail;
 814         err = igmp6_init(&inet6_family_ops);
 815         if (err)
 816                 goto igmp_fail;
 817         err = ipv6_netfilter_init();
 818         if (err)
 819                 goto netfilter_fail;
 820         /* Create /proc/foo6 entries. */
 821 #ifdef CONFIG_PROC_FS
 822         err = -ENOMEM;
 823         if (raw6_proc_init())
 824                 goto proc_raw6_fail;
 825         if (tcp6_proc_init())
 826                 goto proc_tcp6_fail;
 827         if (udp6_proc_init())
 828                 goto proc_udp6_fail;
 829         if (udplite6_proc_init())
 830                 goto proc_udplite6_fail;
 831         if (ipv6_misc_proc_init())
 832                 goto proc_misc6_fail;
 833
 834         if (ac6_proc_init())
 835                 goto proc_anycast6_fail;
 836         if (if6_proc_init())
 837                 goto proc_if6_fail;
 838 #endif
 839         err = ip6_route_init();
 840         if (err)
 841                 goto ip6_route_fail;
 842         err = ip6_flowlabel_init();
 843         if (err)
 844                 goto ip6_flowlabel_fail;
 845         err = addrconf_init();
 846         if (err)
 847                 goto addrconf_fail;
 848
 849         /* Init v6 extension headers. */
 850         err = ipv6_exthdrs_init();
 851         if (err)
 852                 goto ipv6_exthdrs_fail;
 853
 854         err = ipv6_frag_init();
 855         if (err)
 856                 goto ipv6_frag_fail;
 857
 858         /* Init v6 transport protocols. */
 859         err = udpv6_init();
 860         if (err)
 861                 goto udpv6_fail;
 862
 863         err = udplitev6_init();
 864         if (err)
 865                 goto udplitev6_fail;
 866
 867         err = tcpv6_init();
 868         if (err)
 869                 goto tcpv6_fail;
 870
 871         err = ipv6_packet_init();
 872         if (err)
 873                 goto ipv6_packet_fail;
 874 out:
 875         return err;
 876
 877 ipv6_packet_fail:
 878         tcpv6_exit();
 879 tcpv6_fail:
 880         udplitev6_exit();
 881 udplitev6_fail:
 882         udpv6_exit();
 883 udpv6_fail:
 884         ipv6_frag_exit();
 885 ipv6_frag_fail:
 886         ipv6_exthdrs_exit();
 887 ipv6_exthdrs_fail:
 888         addrconf_cleanup();
 889 addrconf_fail:
 890         ip6_flowlabel_cleanup();
 891 ip6_flowlabel_fail:
 892         ip6_route_cleanup();
 893 ip6_route_fail:
 894 #ifdef CONFIG_PROC_FS
 895         if6_proc_exit();
 896 proc_if6_fail:
 897         ac6_proc_exit();
 898 proc_anycast6_fail:
 899         ipv6_misc_proc_exit();
 900 proc_misc6_fail:
 901         udplite6_proc_exit();
 902 proc_udplite6_fail:
 903         udp6_proc_exit();
 904 proc_udp6_fail:
 905         tcp6_proc_exit();
 906 proc_tcp6_fail:
 907         raw6_proc_exit();
 908 proc_raw6_fail:
 909 #endif
 910         ipv6_netfilter_fini();
 911 netfilter_fail:
 912         igmp6_cleanup();
 913 igmp_fail:
 914         ndisc_cleanup();
 915 ndisc_fail:
 916         icmpv6_cleanup();
 917 icmp_fail:
 918 #ifdef CONFIG_SYSCTL
 919         ipv6_sysctl_unregister();
 920 sysctl_fail:
 921 #endif
 922         unregister_pernet_subsys(&inet6_net_ops);
 923 register_pernet_fail:
 924         cleanup_ipv6_mibs();
 925 out_unregister_sock:
 926         sock_unregister(PF_INET6);
 927         rtnl_unregister_all(PF_INET6);
 928 out_sock_register_fail:
 929         rawv6_exit();
 930 out_unregister_raw_proto:
 931         proto_unregister(&rawv6_prot);
 932 out_unregister_udplite_proto:
 933         proto_unregister(&udplitev6_prot);
 934 out_unregister_udp_proto:
 935         proto_unregister(&udpv6_prot);
 936 out_unregister_tcp_proto:
 937         proto_unregister(&tcpv6_prot);
 938         goto out;
 939 }
 940 module_init(inet6_init);
 941
 942 static void __exit inet6_exit(void)
 943 {
 944         /* First of all disallow new sockets creation. */
 945         sock_unregister(PF_INET6);
 946         /* Disallow any further netlink messages */
 947         rtnl_unregister_all(PF_INET6);
 948
 949         udpv6_exit();
 950         udplitev6_exit();
 951         tcpv6_exit();
 952
 953         /* Cleanup code parts. */
 954         ipv6_packet_cleanup();
 955         ipv6_frag_exit();
 956         ipv6_exthdrs_exit();
 957         addrconf_cleanup();
 958         ip6_flowlabel_cleanup();
 959         ip6_route_cleanup();
 960 #ifdef CONFIG_PROC_FS
 961
 962         /* Cleanup code parts. */
 963         if6_proc_exit();
 964         ac6_proc_exit();
 965         ipv6_misc_proc_exit();
 966         udplite6_proc_exit();
 967         udp6_proc_exit();
 968         tcp6_proc_exit();
 969         raw6_proc_exit();
 970 #endif
 971         ipv6_netfilter_fini();
 972         igmp6_cleanup();
 973         ndisc_cleanup();
 974         icmpv6_cleanup();
 975         rawv6_exit();
 976 #ifdef CONFIG_SYSCTL
 977         ipv6_sysctl_unregister();
 978 #endif
 979         unregister_pernet_subsys(&inet6_net_ops);
 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);