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/config.h>
  27 #include <linux/errno.h>
  28 #include <linux/types.h>
  29 #include <linux/socket.h>
  30 #include <linux/in.h>
  31 #include <linux/kernel.h>
  32 #include <linux/sched.h>
  33 #include <linux/timer.h>
  34 #include <linux/string.h>
  35 #include <linux/sockios.h>
  36 #include <linux/net.h>
  37 #include <linux/fcntl.h>
  38 #include <linux/mm.h>
  39 #include <linux/interrupt.h>
  40 #include <linux/proc_fs.h>
  41 #include <linux/stat.h>
  42 #include <linux/init.h>
  43
  44 #include <linux/inet.h>
  45 #include <linux/netdevice.h>
  46 #include <linux/icmpv6.h>
  47 #include <linux/smp_lock.h>
  48 #include <linux/netfilter_ipv6.h>
  49
  50 #include <net/ip.h>
  51 #include <net/ipv6.h>
  52 #include <net/udp.h>
  53 #include <net/tcp.h>
  54 #include <net/ipip.h>
  55 #include <net/protocol.h>
  56 #include <net/inet_common.h>
  57 #include <net/transp_v6.h>
  58 #include <net/ip6_route.h>
  59 #include <net/addrconf.h>
  60 #ifdef CONFIG_IPV6_TUNNEL
  61 #include <net/ip6_tunnel.h>
  62 #endif
  63
  64 #include <asm/uaccess.h>
  65 #include <asm/system.h>
  66
  67 MODULE_AUTHOR("Cast of dozens");
  68 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
  69 MODULE_LICENSE("GPL");
  70
  71 int sysctl_ipv6_bindv6only;
  72
  73 /* The inetsw table contains everything that inet_create needs to
  74  * build a new socket.
  75  */
  76 static struct list_head inetsw6[SOCK_MAX];
  77 static DEFINE_SPINLOCK(inetsw6_lock);
  78
  79 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
  80 {
  81         const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
  82
  83         return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
  84 }
  85
  86 static int inet6_create(struct socket *sock, int protocol)
  87 {
  88         struct inet_sock *inet;
  89         struct ipv6_pinfo *np;
  90         struct sock *sk;
  91         struct list_head *p;
  92         struct inet_protosw *answer;
  93         struct proto *answer_prot;
  94         unsigned char answer_flags;
  95         char answer_no_check;
  96         int try_loading_module = 0;
  97         int err;
  98
  99         /* Look for the requested type/protocol pair. */
 100         answer = NULL;
 101 lookup_protocol:
 102         err = -ESOCKTNOSUPPORT;
 103         rcu_read_lock();
 104         list_for_each_rcu(p, &inetsw6[sock->type]) {
 105                 answer = list_entry(p, struct inet_protosw, list);
 106
 107                 /* Check the non-wild match. */
 108                 if (protocol == answer->protocol) {
 109                         if (protocol != IPPROTO_IP)
 110                                 break;
 111                 } else {
 112                         /* Check for the two wild cases. */
 113                         if (IPPROTO_IP == protocol) {
 114                                 protocol = answer->protocol;
 115                                 break;
 116                         }
 117                         if (IPPROTO_IP == answer->protocol)
 118                                 break;
 119                 }
 120                 err = -EPROTONOSUPPORT;
 121                 answer = NULL;
 122         }
 123
 124         if (!answer) {
 125                 if (try_loading_module < 2) {
 126                         rcu_read_unlock();
 127                         /*
 128                          * Be more specific, e.g. net-pf-10-proto-132-type-1
 129                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
 130                          */
 131                         if (++try_loading_module == 1)
 132                                 request_module("net-pf-%d-proto-%d-type-%d",
 133                                                 PF_INET6, protocol, sock->type);
 134                         /*
 135                          * Fall back to generic, e.g. net-pf-10-proto-132
 136                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
 137                          */
 138                         else
 139                                 request_module("net-pf-%d-proto-%d",
 140                                                 PF_INET6, protocol);
 141                         goto lookup_protocol;
 142                 } else
 143                         goto out_rcu_unlock;
 144         }
 145
 146         err = -EPERM;
 147         if (answer->capability > 0 && !capable(answer->capability))
 148                 goto out_rcu_unlock;
 149
 150         sock->ops = answer->ops;
 151         answer_prot = answer->prot;
 152         answer_no_check = answer->no_check;
 153         answer_flags = answer->flags;
 154         rcu_read_unlock();
 155
 156         BUG_TRAP(answer_prot->slab != NULL);
 157
 158         err = -ENOBUFS;
 159         sk = sk_alloc(PF_INET6, GFP_KERNEL, answer_prot, 1);
 160         if (sk == NULL)
 161                 goto out;
 162
 163         sock_init_data(sock, sk);
 164
 165         err = 0;
 166         sk->sk_no_check = answer_no_check;
 167         if (INET_PROTOSW_REUSE & answer_flags)
 168                 sk->sk_reuse = 1;
 169
 170         inet = inet_sk(sk);
 171         inet->is_icsk = INET_PROTOSW_ICSK & answer_flags;
 172
 173         if (SOCK_RAW == sock->type) {
 174                 inet->num = protocol;
 175                 if (IPPROTO_RAW == protocol)
 176                         inet->hdrincl = 1;
 177         }
 178
 179         sk->sk_destruct         = inet_sock_destruct;
 180         sk->sk_family           = PF_INET6;
 181         sk->sk_protocol         = protocol;
 182
 183         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
 184
 185         inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
 186         np->hop_limit   = -1;
 187         np->mcast_hops  = -1;
 188         np->mc_loop     = 1;
 189         np->pmtudisc    = IPV6_PMTUDISC_WANT;
 190         np->ipv6only    = sysctl_ipv6_bindv6only;
 191
 192         /* Init the ipv4 part of the socket since we can have sockets
 193          * using v6 API for ipv4.
 194          */
 195         inet->uc_ttl    = -1;
 196
 197         inet->mc_loop   = 1;
 198         inet->mc_ttl    = 1;
 199         inet->mc_index  = 0;
 200         inet->mc_list   = NULL;
 201
 202         if (ipv4_config.no_pmtu_disc)
 203                 inet->pmtudisc = IP_PMTUDISC_DONT;
 204         else
 205                 inet->pmtudisc = IP_PMTUDISC_WANT;
 206         /*
 207          * Increment only the relevant sk_prot->socks debug field, this changes
 208          * the previous behaviour of incrementing both the equivalent to
 209          * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
 210          *
 211          * This allows better debug granularity as we'll know exactly how many
 212          * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
 213          * transport protocol socks. -acme
 214          */
 215         sk_refcnt_debug_inc(sk);
 216
 217         if (inet->num) {
 218                 /* It assumes that any protocol which allows
 219                  * the user to assign a number at socket
 220                  * creation time automatically shares.
 221                  */
 222                 inet->sport = ntohs(inet->num);
 223                 sk->sk_prot->hash(sk);
 224         }
 225         if (sk->sk_prot->init) {
 226                 err = sk->sk_prot->init(sk);
 227                 if (err) {
 228                         sk_common_release(sk);
 229                         goto out;
 230                 }
 231         }
 232 out:
 233         return err;
 234 out_rcu_unlock:
 235         rcu_read_unlock();
 236         goto out;
 237 }
 238
 239
 240 /* bind for INET6 API */
 241 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 242 {
 243         struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
 244         struct sock *sk = sock->sk;
 245         struct inet_sock *inet = inet_sk(sk);
 246         struct ipv6_pinfo *np = inet6_sk(sk);
 247         __u32 v4addr = 0;
 248         unsigned short snum;
 249         int addr_type = 0;
 250         int err = 0;
 251
 252         /* If the socket has its own bind function then use it. */
 253         if (sk->sk_prot->bind)
 254                 return sk->sk_prot->bind(sk, uaddr, addr_len);
 255
 256         if (addr_len < SIN6_LEN_RFC2133)
 257                 return -EINVAL;
 258         addr_type = ipv6_addr_type(&addr->sin6_addr);
 259         if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
 260                 return -EINVAL;
 261
 262         snum = ntohs(addr->sin6_port);
 263         if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
 264                 return -EACCES;
 265
 266         lock_sock(sk);
 267
 268         /* Check these errors (active socket, double bind). */
 269         if (sk->sk_state != TCP_CLOSE || inet->num) {
 270                 err = -EINVAL;
 271                 goto out;
 272         }
 273
 274         /* Check if the address belongs to the host. */
 275         if (addr_type == IPV6_ADDR_MAPPED) {
 276                 v4addr = addr->sin6_addr.s6_addr32[3];
 277                 if (inet_addr_type(v4addr) != RTN_LOCAL) {
 278                         err = -EADDRNOTAVAIL;
 279                         goto out;
 280                 }
 281         } else {
 282                 if (addr_type != IPV6_ADDR_ANY) {
 283                         struct net_device *dev = NULL;
 284
 285                         if (addr_type & IPV6_ADDR_LINKLOCAL) {
 286                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 287                                     addr->sin6_scope_id) {
 288                                         /* Override any existing binding, if another one
 289                                          * is supplied by user.
 290                                          */
 291                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
 292                                 }
 293
 294                                 /* Binding to link-local address requires an interface */
 295                                 if (!sk->sk_bound_dev_if) {
 296                                         err = -EINVAL;
 297                                         goto out;
 298                                 }
 299                                 dev = dev_get_by_index(sk->sk_bound_dev_if);
 300                                 if (!dev) {
 301                                         err = -ENODEV;
 302                                         goto out;
 303                                 }
 304                         }
 305
 306                         /* ipv4 addr of the socket is invalid.  Only the
 307                          * unspecified and mapped address have a v4 equivalent.
 308                          */
 309                         v4addr = LOOPBACK4_IPV6;
 310                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
 311                                 if (!ipv6_chk_addr(&addr->sin6_addr, dev, 0)) {
 312                                         if (dev)
 313                                                 dev_put(dev);
 314                                         err = -EADDRNOTAVAIL;
 315                                         goto out;
 316                                 }
 317                         }
 318                         if (dev)
 319                                 dev_put(dev);
 320                 }
 321         }
 322
 323         inet->rcv_saddr = v4addr;
 324         inet->saddr = v4addr;
 325
 326         ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
 327
 328         if (!(addr_type & IPV6_ADDR_MULTICAST))
 329                 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
 330
 331         /* Make sure we are allowed to bind here. */
 332         if (sk->sk_prot->get_port(sk, snum)) {
 333                 inet_reset_saddr(sk);
 334                 err = -EADDRINUSE;
 335                 goto out;
 336         }
 337
 338         if (addr_type != IPV6_ADDR_ANY)
 339                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
 340         if (snum)
 341                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
 342         inet->sport = ntohs(inet->num);
 343         inet->dport = 0;
 344         inet->daddr = 0;
 345 out:
 346         release_sock(sk);
 347         return err;
 348 }
 349
 350 int inet6_release(struct socket *sock)
 351 {
 352         struct sock *sk = sock->sk;
 353
 354         if (sk == NULL)
 355                 return -EINVAL;
 356
 357         /* Free mc lists */
 358         ipv6_sock_mc_close(sk);
 359
 360         /* Free ac lists */
 361         ipv6_sock_ac_close(sk);
 362
 363         return inet_release(sock);
 364 }
 365
 366 int inet6_destroy_sock(struct sock *sk)
 367 {
 368         struct ipv6_pinfo *np = inet6_sk(sk);
 369         struct sk_buff *skb;
 370         struct ipv6_txoptions *opt;
 371
 372         /* Release rx options */
 373
 374         if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
 375                 kfree_skb(skb);
 376
 377         /* Free flowlabels */
 378         fl6_free_socklist(sk);
 379
 380         /* Free tx options */
 381
 382         if ((opt = xchg(&np->opt, NULL)) != NULL)
 383                 sock_kfree_s(sk, opt, opt->tot_len);
 384
 385         return 0;
 386 }
 387
 388 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
 389
 390 /*
 391  *      This does both peername and sockname.
 392  */
 393
 394 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 395                  int *uaddr_len, int peer)
 396 {
 397         struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
 398         struct sock *sk = sock->sk;
 399         struct inet_sock *inet = inet_sk(sk);
 400         struct ipv6_pinfo *np = inet6_sk(sk);
 401
 402         sin->sin6_family = AF_INET6;
 403         sin->sin6_flowinfo = 0;
 404         sin->sin6_scope_id = 0;
 405         if (peer) {
 406                 if (!inet->dport)
 407                         return -ENOTCONN;
 408                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
 409                     peer == 1)
 410                         return -ENOTCONN;
 411                 sin->sin6_port = inet->dport;
 412                 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
 413                 if (np->sndflow)
 414                         sin->sin6_flowinfo = np->flow_label;
 415         } else {
 416                 if (ipv6_addr_any(&np->rcv_saddr))
 417                         ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
 418                 else
 419                         ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
 420
 421                 sin->sin6_port = inet->sport;
 422         }
 423         if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
 424                 sin->sin6_scope_id = sk->sk_bound_dev_if;
 425         *uaddr_len = sizeof(*sin);
 426         return(0);
 427 }
 428
 429 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 430 {
 431         struct sock *sk = sock->sk;
 432
 433         switch(cmd)
 434         {
 435         case SIOCGSTAMP:
 436                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
 437
 438         case SIOCADDRT:
 439         case SIOCDELRT:
 440
 441                 return(ipv6_route_ioctl(cmd,(void __user *)arg));
 442
 443         case SIOCSIFADDR:
 444                 return addrconf_add_ifaddr((void __user *) arg);
 445         case SIOCDIFADDR:
 446                 return addrconf_del_ifaddr((void __user *) arg);
 447         case SIOCSIFDSTADDR:
 448                 return addrconf_set_dstaddr((void __user *) arg);
 449         default:
 450                 if (!sk->sk_prot->ioctl)
 451                         return -ENOIOCTLCMD;
 452                 return sk->sk_prot->ioctl(sk, cmd, arg);
 453         }
 454         /*NOTREACHED*/
 455         return(0);
 456 }
 457
 458 const struct proto_ops inet6_stream_ops = {
 459         .family            = PF_INET6,
 460         .owner             = THIS_MODULE,
 461         .release           = inet6_release,
 462         .bind              = inet6_bind,
 463         .connect           = inet_stream_connect,       /* ok           */
 464         .socketpair        = sock_no_socketpair,        /* a do nothing */
 465         .accept            = inet_accept,               /* ok           */
 466         .getname           = inet6_getname,
 467         .poll              = tcp_poll,                  /* ok           */
 468         .ioctl             = inet6_ioctl,               /* must change  */
 469         .listen            = inet_listen,               /* ok           */
 470         .shutdown          = inet_shutdown,             /* ok           */
 471         .setsockopt        = sock_common_setsockopt,    /* ok           */
 472         .getsockopt        = sock_common_getsockopt,    /* ok           */
 473         .sendmsg           = inet_sendmsg,              /* ok           */
 474         .recvmsg           = sock_common_recvmsg,       /* ok           */
 475         .mmap              = sock_no_mmap,
 476         .sendpage          = tcp_sendpage,
 477 #ifdef CONFIG_COMPAT
 478         .compat_setsockopt = compat_sock_common_setsockopt,
 479         .compat_getsockopt = compat_sock_common_getsockopt,
 480 #endif
 481 };
 482
 483 const struct proto_ops inet6_dgram_ops = {
 484         .family            = PF_INET6,
 485         .owner             = THIS_MODULE,
 486         .release           = inet6_release,
 487         .bind              = inet6_bind,
 488         .connect           = inet_dgram_connect,        /* ok           */
 489         .socketpair        = sock_no_socketpair,        /* a do nothing */
 490         .accept            = sock_no_accept,            /* a do nothing */
 491         .getname           = inet6_getname,
 492         .poll              = udp_poll,                  /* ok           */
 493         .ioctl             = inet6_ioctl,               /* must change  */
 494         .listen            = sock_no_listen,            /* ok           */
 495         .shutdown          = inet_shutdown,             /* ok           */
 496         .setsockopt        = sock_common_setsockopt,    /* ok           */
 497         .getsockopt        = sock_common_getsockopt,    /* ok           */
 498         .sendmsg           = inet_sendmsg,              /* ok           */
 499         .recvmsg           = sock_common_recvmsg,       /* ok           */
 500         .mmap              = sock_no_mmap,
 501         .sendpage          = sock_no_sendpage,
 502 #ifdef CONFIG_COMPAT
 503         .compat_setsockopt = compat_sock_common_setsockopt,
 504         .compat_getsockopt = compat_sock_common_getsockopt,
 505 #endif
 506 };
 507
 508 static struct net_proto_family inet6_family_ops = {
 509         .family = PF_INET6,
 510         .create = inet6_create,
 511         .owner  = THIS_MODULE,
 512 };
 513
 514 /* Same as inet6_dgram_ops, sans udp_poll.  */
 515 static const struct proto_ops inet6_sockraw_ops = {
 516         .family            = PF_INET6,
 517         .owner             = THIS_MODULE,
 518         .release           = inet6_release,
 519         .bind              = inet6_bind,
 520         .connect           = inet_dgram_connect,        /* ok           */
 521         .socketpair        = sock_no_socketpair,        /* a do nothing */
 522         .accept            = sock_no_accept,            /* a do nothing */
 523         .getname           = inet6_getname,
 524         .poll              = datagram_poll,             /* ok           */
 525         .ioctl             = inet6_ioctl,               /* must change  */
 526         .listen            = sock_no_listen,            /* ok           */
 527         .shutdown          = inet_shutdown,             /* ok           */
 528         .setsockopt        = sock_common_setsockopt,    /* ok           */
 529         .getsockopt        = sock_common_getsockopt,    /* ok           */
 530         .sendmsg           = inet_sendmsg,              /* ok           */
 531         .recvmsg           = sock_common_recvmsg,       /* ok           */
 532         .mmap              = sock_no_mmap,
 533         .sendpage          = sock_no_sendpage,
 534 #ifdef CONFIG_COMPAT
 535         .compat_setsockopt = compat_sock_common_setsockopt,
 536         .compat_getsockopt = compat_sock_common_getsockopt,
 537 #endif
 538 };
 539
 540 static struct inet_protosw rawv6_protosw = {
 541         .type           = SOCK_RAW,
 542         .protocol       = IPPROTO_IP,   /* wild card */
 543         .prot           = &rawv6_prot,
 544         .ops            = &inet6_sockraw_ops,
 545         .capability     = CAP_NET_RAW,
 546         .no_check       = UDP_CSUM_DEFAULT,
 547         .flags          = INET_PROTOSW_REUSE,
 548 };
 549
 550 void
 551 inet6_register_protosw(struct inet_protosw *p)
 552 {
 553         struct list_head *lh;
 554         struct inet_protosw *answer;
 555         int protocol = p->protocol;
 556         struct list_head *last_perm;
 557
 558         spin_lock_bh(&inetsw6_lock);
 559
 560         if (p->type >= SOCK_MAX)
 561                 goto out_illegal;
 562
 563         /* If we are trying to override a permanent protocol, bail. */
 564         answer = NULL;
 565         last_perm = &inetsw6[p->type];
 566         list_for_each(lh, &inetsw6[p->type]) {
 567                 answer = list_entry(lh, struct inet_protosw, list);
 568
 569                 /* Check only the non-wild match. */
 570                 if (INET_PROTOSW_PERMANENT & answer->flags) {
 571                         if (protocol == answer->protocol)
 572                                 break;
 573                         last_perm = lh;
 574                 }
 575
 576                 answer = NULL;
 577         }
 578         if (answer)
 579                 goto out_permanent;
 580
 581         /* Add the new entry after the last permanent entry if any, so that
 582          * the new entry does not override a permanent entry when matched with
 583          * a wild-card protocol. But it is allowed to override any existing
 584          * non-permanent entry.  This means that when we remove this entry, the
 585          * system automatically returns to the old behavior.
 586          */
 587         list_add_rcu(&p->list, last_perm);
 588 out:
 589         spin_unlock_bh(&inetsw6_lock);
 590         return;
 591
 592 out_permanent:
 593         printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
 594                protocol);
 595         goto out;
 596
 597 out_illegal:
 598         printk(KERN_ERR
 599                "Ignoring attempt to register invalid socket type %d.\n",
 600                p->type);
 601         goto out;
 602 }
 603
 604 void
 605 inet6_unregister_protosw(struct inet_protosw *p)
 606 {
 607         if (INET_PROTOSW_PERMANENT & p->flags) {
 608                 printk(KERN_ERR
 609                        "Attempt to unregister permanent protocol %d.\n",
 610                        p->protocol);
 611         } else {
 612                 spin_lock_bh(&inetsw6_lock);
 613                 list_del_rcu(&p->list);
 614                 spin_unlock_bh(&inetsw6_lock);
 615
 616                 synchronize_net();
 617         }
 618 }
 619
 620 int inet6_sk_rebuild_header(struct sock *sk)
 621 {
 622         int err;
 623         struct dst_entry *dst;
 624         struct ipv6_pinfo *np = inet6_sk(sk);
 625
 626         dst = __sk_dst_check(sk, np->dst_cookie);
 627
 628         if (dst == NULL) {
 629                 struct inet_sock *inet = inet_sk(sk);
 630                 struct in6_addr *final_p = NULL, final;
 631                 struct flowi fl;
 632
 633                 memset(&fl, 0, sizeof(fl));
 634                 fl.proto = sk->sk_protocol;
 635                 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 636                 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
 637                 fl.fl6_flowlabel = np->flow_label;
 638                 fl.oif = sk->sk_bound_dev_if;
 639                 fl.fl_ip_dport = inet->dport;
 640                 fl.fl_ip_sport = inet->sport;
 641
 642                 if (np->opt && np->opt->srcrt) {
 643                         struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
 644                         ipv6_addr_copy(&final, &fl.fl6_dst);
 645                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 646                         final_p = &final;
 647                 }
 648
 649                 err = ip6_dst_lookup(sk, &dst, &fl);
 650                 if (err) {
 651                         sk->sk_route_caps = 0;
 652                         return err;
 653                 }
 654                 if (final_p)
 655                         ipv6_addr_copy(&fl.fl6_dst, final_p);
 656
 657                 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
 658                         sk->sk_err_soft = -err;
 659                         return err;
 660                 }
 661
 662                 ip6_dst_store(sk, dst, NULL);
 663         }
 664
 665         return 0;
 666 }
 667
 668 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
 669
 670 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
 671 {
 672         struct ipv6_pinfo *np = inet6_sk(sk);
 673         struct inet6_skb_parm *opt = IP6CB(skb);
 674
 675         if (np->rxopt.all) {
 676                 if ((opt->hop && (np->rxopt.bits.hopopts ||
 677                                   np->rxopt.bits.ohopopts)) ||
 678                     ((IPV6_FLOWINFO_MASK & *(u32*)skb->nh.raw) &&
 679                      np->rxopt.bits.rxflow) ||
 680                     (opt->srcrt && (np->rxopt.bits.srcrt ||
 681                      np->rxopt.bits.osrcrt)) ||
 682                     ((opt->dst1 || opt->dst0) &&
 683                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
 684                         return 1;
 685         }
 686         return 0;
 687 }
 688
 689 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
 690
 691 int
 692 snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign)
 693 {
 694         if (ptr == NULL)
 695                 return -EINVAL;
 696
 697         ptr[0] = __alloc_percpu(mibsize);
 698         if (!ptr[0])
 699                 goto err0;
 700
 701         ptr[1] = __alloc_percpu(mibsize);
 702         if (!ptr[1])
 703                 goto err1;
 704
 705         return 0;
 706
 707 err1:
 708         free_percpu(ptr[0]);
 709         ptr[0] = NULL;
 710 err0:
 711         return -ENOMEM;
 712 }
 713
 714 void
 715 snmp6_mib_free(void *ptr[2])
 716 {
 717         if (ptr == NULL)
 718                 return;
 719         if (ptr[0])
 720                 free_percpu(ptr[0]);
 721         if (ptr[1])
 722                 free_percpu(ptr[1]);
 723         ptr[0] = ptr[1] = NULL;
 724 }
 725
 726 static int __init init_ipv6_mibs(void)
 727 {
 728         if (snmp6_mib_init((void **)ipv6_statistics, sizeof (struct ipstats_mib),
 729                            __alignof__(struct ipstats_mib)) < 0)
 730                 goto err_ip_mib;
 731         if (snmp6_mib_init((void **)icmpv6_statistics, sizeof (struct icmpv6_mib),
 732                            __alignof__(struct icmpv6_mib)) < 0)
 733                 goto err_icmp_mib;
 734         if (snmp6_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib),
 735                            __alignof__(struct udp_mib)) < 0)
 736                 goto err_udp_mib;
 737         return 0;
 738
 739 err_udp_mib:
 740         snmp6_mib_free((void **)icmpv6_statistics);
 741 err_icmp_mib:
 742         snmp6_mib_free((void **)ipv6_statistics);
 743 err_ip_mib:
 744         return -ENOMEM;
 745
 746 }
 747
 748 static void cleanup_ipv6_mibs(void)
 749 {
 750         snmp6_mib_free((void **)ipv6_statistics);
 751         snmp6_mib_free((void **)icmpv6_statistics);
 752         snmp6_mib_free((void **)udp_stats_in6);
 753 }
 754
 755 static int __init inet6_init(void)
 756 {
 757         struct sk_buff *dummy_skb;
 758         struct list_head *r;
 759         int err;
 760
 761 #ifdef MODULE
 762 #if 0 /* FIXME --RR */
 763         if (!mod_member_present(&__this_module, can_unload))
 764           return -EINVAL;
 765
 766         __this_module.can_unload = &ipv6_unload;
 767 #endif
 768 #endif
 769
 770         if (sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb)) {
 771                 printk(KERN_CRIT "inet6_proto_init: size fault\n");
 772                 return -EINVAL;
 773         }
 774
 775         err = proto_register(&tcpv6_prot, 1);
 776         if (err)
 777                 goto out;
 778
 779         err = proto_register(&udpv6_prot, 1);
 780         if (err)
 781                 goto out_unregister_tcp_proto;
 782
 783         err = proto_register(&rawv6_prot, 1);
 784         if (err)
 785                 goto out_unregister_udp_proto;
 786
 787
 788         /* Register the socket-side information for inet6_create.  */
 789         for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
 790                 INIT_LIST_HEAD(r);
 791
 792         /* We MUST register RAW sockets before we create the ICMP6,
 793          * IGMP6, or NDISC control sockets.
 794          */
 795         inet6_register_protosw(&rawv6_protosw);
 796
 797         /* Register the family here so that the init calls below will
 798          * be able to create sockets. (?? is this dangerous ??)
 799          */
 800         err = sock_register(&inet6_family_ops);
 801         if (err)
 802                 goto out_unregister_raw_proto;
 803
 804         /* Initialise ipv6 mibs */
 805         err = init_ipv6_mibs();
 806         if (err)
 807                 goto out_unregister_sock;
 808
 809         /*
 810          *      ipngwg API draft makes clear that the correct semantics
 811          *      for TCP and UDP is to consider one TCP and UDP instance
 812          *      in a host availiable by both INET and INET6 APIs and
 813          *      able to communicate via both network protocols.
 814          */
 815
 816 #ifdef CONFIG_SYSCTL
 817         ipv6_sysctl_register();
 818 #endif
 819         err = icmpv6_init(&inet6_family_ops);
 820         if (err)
 821                 goto icmp_fail;
 822         err = ndisc_init(&inet6_family_ops);
 823         if (err)
 824                 goto ndisc_fail;
 825         err = igmp6_init(&inet6_family_ops);
 826         if (err)
 827                 goto igmp_fail;
 828         err = ipv6_netfilter_init();
 829         if (err)
 830                 goto netfilter_fail;
 831         /* Create /proc/foo6 entries. */
 832 #ifdef CONFIG_PROC_FS
 833         err = -ENOMEM;
 834         if (raw6_proc_init())
 835                 goto proc_raw6_fail;
 836         if (tcp6_proc_init())
 837                 goto proc_tcp6_fail;
 838         if (udp6_proc_init())
 839                 goto proc_udp6_fail;
 840         if (ipv6_misc_proc_init())
 841                 goto proc_misc6_fail;
 842
 843         if (ac6_proc_init())
 844                 goto proc_anycast6_fail;
 845         if (if6_proc_init())
 846                 goto proc_if6_fail;
 847 #endif
 848         ip6_route_init();
 849         ip6_flowlabel_init();
 850         err = addrconf_init();
 851         if (err)
 852                 goto addrconf_fail;
 853         sit_init();
 854
 855         /* Init v6 extension headers. */
 856         ipv6_rthdr_init();
 857         ipv6_frag_init();
 858         ipv6_nodata_init();
 859         ipv6_destopt_init();
 860
 861         /* Init v6 transport protocols. */
 862         udpv6_init();
 863         tcpv6_init();
 864
 865         ipv6_packet_init();
 866         err = 0;
 867 out:
 868         return err;
 869
 870 addrconf_fail:
 871         ip6_flowlabel_cleanup();
 872         ip6_route_cleanup();
 873 #ifdef CONFIG_PROC_FS
 874         if6_proc_exit();
 875 proc_if6_fail:
 876         ac6_proc_exit();
 877 proc_anycast6_fail:
 878         ipv6_misc_proc_exit();
 879 proc_misc6_fail:
 880         udp6_proc_exit();
 881 proc_udp6_fail:
 882         tcp6_proc_exit();
 883 proc_tcp6_fail:
 884         raw6_proc_exit();
 885 proc_raw6_fail:
 886 #endif
 887         ipv6_netfilter_fini();
 888 netfilter_fail:
 889         igmp6_cleanup();
 890 igmp_fail:
 891         ndisc_cleanup();
 892 ndisc_fail:
 893         icmpv6_cleanup();
 894 icmp_fail:
 895 #ifdef CONFIG_SYSCTL
 896         ipv6_sysctl_unregister();
 897 #endif
 898         cleanup_ipv6_mibs();
 899 out_unregister_sock:
 900         sock_unregister(PF_INET6);
 901 out_unregister_raw_proto:
 902         proto_unregister(&rawv6_prot);
 903 out_unregister_udp_proto:
 904         proto_unregister(&udpv6_prot);
 905 out_unregister_tcp_proto:
 906         proto_unregister(&tcpv6_prot);
 907         goto out;
 908 }
 909 module_init(inet6_init);
 910
 911 static void __exit inet6_exit(void)
 912 {
 913         /* First of all disallow new sockets creation. */
 914         sock_unregister(PF_INET6);
 915 #ifdef CONFIG_PROC_FS
 916         if6_proc_exit();
 917         ac6_proc_exit();
 918         ipv6_misc_proc_exit();
 919         udp6_proc_exit();
 920         tcp6_proc_exit();
 921         raw6_proc_exit();
 922 #endif
 923         /* Cleanup code parts. */
 924         sit_cleanup();
 925         ip6_flowlabel_cleanup();
 926         addrconf_cleanup();
 927         ip6_route_cleanup();
 928         ipv6_packet_cleanup();
 929         igmp6_cleanup();
 930         ipv6_netfilter_fini();
 931         ndisc_cleanup();
 932         icmpv6_cleanup();
 933 #ifdef CONFIG_SYSCTL
 934         ipv6_sysctl_unregister();
 935 #endif
 936         cleanup_ipv6_mibs();
 937         proto_unregister(&rawv6_prot);
 938         proto_unregister(&udpv6_prot);
 939         proto_unregister(&tcpv6_prot);
 940 }
 941 module_exit(inet6_exit);
 942
 943 MODULE_ALIAS_NETPROTO(PF_INET6);