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         /*
 373          *      Release destination entry
 374          */
 375
 376         sk_dst_reset(sk);
 377
 378         /* Release rx options */
 379
 380         if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
 381                 kfree_skb(skb);
 382
 383         /* Free flowlabels */
 384         fl6_free_socklist(sk);
 385
 386         /* Free tx options */
 387
 388         if ((opt = xchg(&np->opt, NULL)) != NULL)
 389                 sock_kfree_s(sk, opt, opt->tot_len);
 390
 391         return 0;
 392 }
 393
 394 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
 395
 396 /*
 397  *      This does both peername and sockname.
 398  */
 399
 400 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 401                  int *uaddr_len, int peer)
 402 {
 403         struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
 404         struct sock *sk = sock->sk;
 405         struct inet_sock *inet = inet_sk(sk);
 406         struct ipv6_pinfo *np = inet6_sk(sk);
 407
 408         sin->sin6_family = AF_INET6;
 409         sin->sin6_flowinfo = 0;
 410         sin->sin6_scope_id = 0;
 411         if (peer) {
 412                 if (!inet->dport)
 413                         return -ENOTCONN;
 414                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
 415                     peer == 1)
 416                         return -ENOTCONN;
 417                 sin->sin6_port = inet->dport;
 418                 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
 419                 if (np->sndflow)
 420                         sin->sin6_flowinfo = np->flow_label;
 421         } else {
 422                 if (ipv6_addr_any(&np->rcv_saddr))
 423                         ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
 424                 else
 425                         ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
 426
 427                 sin->sin6_port = inet->sport;
 428         }
 429         if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
 430                 sin->sin6_scope_id = sk->sk_bound_dev_if;
 431         *uaddr_len = sizeof(*sin);
 432         return(0);
 433 }
 434
 435 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 436 {
 437         struct sock *sk = sock->sk;
 438
 439         switch(cmd)
 440         {
 441         case SIOCGSTAMP:
 442                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
 443
 444         case SIOCADDRT:
 445         case SIOCDELRT:
 446
 447                 return(ipv6_route_ioctl(cmd,(void __user *)arg));
 448
 449         case SIOCSIFADDR:
 450                 return addrconf_add_ifaddr((void __user *) arg);
 451         case SIOCDIFADDR:
 452                 return addrconf_del_ifaddr((void __user *) arg);
 453         case SIOCSIFDSTADDR:
 454                 return addrconf_set_dstaddr((void __user *) arg);
 455         default:
 456                 if (!sk->sk_prot->ioctl)
 457                         return -ENOIOCTLCMD;
 458                 return sk->sk_prot->ioctl(sk, cmd, arg);
 459         }
 460         /*NOTREACHED*/
 461         return(0);
 462 }
 463
 464 const struct proto_ops inet6_stream_ops = {
 465         .family =       PF_INET6,
 466         .owner =        THIS_MODULE,
 467         .release =      inet6_release,
 468         .bind =         inet6_bind,
 469         .connect =      inet_stream_connect,            /* ok           */
 470         .socketpair =   sock_no_socketpair,             /* a do nothing */
 471         .accept =       inet_accept,                    /* ok           */
 472         .getname =      inet6_getname,
 473         .poll =         tcp_poll,                       /* ok           */
 474         .ioctl =        inet6_ioctl,                    /* must change  */
 475         .listen =       inet_listen,                    /* ok           */
 476         .shutdown =     inet_shutdown,                  /* ok           */
 477         .setsockopt =   sock_common_setsockopt,         /* ok           */
 478         .getsockopt =   sock_common_getsockopt,         /* ok           */
 479         .sendmsg =      inet_sendmsg,                   /* ok           */
 480         .recvmsg =      sock_common_recvmsg,            /* ok           */
 481         .mmap =         sock_no_mmap,
 482         .sendpage =     tcp_sendpage
 483 };
 484
 485 const struct proto_ops inet6_dgram_ops = {
 486         .family =       PF_INET6,
 487         .owner =        THIS_MODULE,
 488         .release =      inet6_release,
 489         .bind =         inet6_bind,
 490         .connect =      inet_dgram_connect,             /* ok           */
 491         .socketpair =   sock_no_socketpair,             /* a do nothing */
 492         .accept =       sock_no_accept,                 /* a do nothing */
 493         .getname =      inet6_getname,
 494         .poll =         udp_poll,                       /* ok           */
 495         .ioctl =        inet6_ioctl,                    /* must change  */
 496         .listen =       sock_no_listen,                 /* ok           */
 497         .shutdown =     inet_shutdown,                  /* ok           */
 498         .setsockopt =   sock_common_setsockopt,         /* ok           */
 499         .getsockopt =   sock_common_getsockopt,         /* ok           */
 500         .sendmsg =      inet_sendmsg,                   /* ok           */
 501         .recvmsg =      sock_common_recvmsg,            /* ok           */
 502         .mmap =         sock_no_mmap,
 503         .sendpage =     sock_no_sendpage,
 504 };
 505
 506 static struct net_proto_family inet6_family_ops = {
 507         .family = PF_INET6,
 508         .create = inet6_create,
 509         .owner  = THIS_MODULE,
 510 };
 511
 512 /* Same as inet6_dgram_ops, sans udp_poll.  */
 513 static const struct proto_ops inet6_sockraw_ops = {
 514         .family =       PF_INET6,
 515         .owner =        THIS_MODULE,
 516         .release =      inet6_release,
 517         .bind =         inet6_bind,
 518         .connect =      inet_dgram_connect,             /* ok           */
 519         .socketpair =   sock_no_socketpair,             /* a do nothing */
 520         .accept =       sock_no_accept,                 /* a do nothing */
 521         .getname =      inet6_getname,
 522         .poll =         datagram_poll,                  /* ok           */
 523         .ioctl =        inet6_ioctl,                    /* must change  */
 524         .listen =       sock_no_listen,                 /* ok           */
 525         .shutdown =     inet_shutdown,                  /* ok           */
 526         .setsockopt =   sock_common_setsockopt,         /* ok           */
 527         .getsockopt =   sock_common_getsockopt,         /* ok           */
 528         .sendmsg =      inet_sendmsg,                   /* ok           */
 529         .recvmsg =      sock_common_recvmsg,            /* ok           */
 530         .mmap =         sock_no_mmap,
 531         .sendpage =     sock_no_sendpage,
 532 };
 533
 534 static struct inet_protosw rawv6_protosw = {
 535         .type           = SOCK_RAW,
 536         .protocol       = IPPROTO_IP,   /* wild card */
 537         .prot           = &rawv6_prot,
 538         .ops            = &inet6_sockraw_ops,
 539         .capability     = CAP_NET_RAW,
 540         .no_check       = UDP_CSUM_DEFAULT,
 541         .flags          = INET_PROTOSW_REUSE,
 542 };
 543
 544 void
 545 inet6_register_protosw(struct inet_protosw *p)
 546 {
 547         struct list_head *lh;
 548         struct inet_protosw *answer;
 549         int protocol = p->protocol;
 550         struct list_head *last_perm;
 551
 552         spin_lock_bh(&inetsw6_lock);
 553
 554         if (p->type >= SOCK_MAX)
 555                 goto out_illegal;
 556
 557         /* If we are trying to override a permanent protocol, bail. */
 558         answer = NULL;
 559         last_perm = &inetsw6[p->type];
 560         list_for_each(lh, &inetsw6[p->type]) {
 561                 answer = list_entry(lh, struct inet_protosw, list);
 562
 563                 /* Check only the non-wild match. */
 564                 if (INET_PROTOSW_PERMANENT & answer->flags) {
 565                         if (protocol == answer->protocol)
 566                                 break;
 567                         last_perm = lh;
 568                 }
 569
 570                 answer = NULL;
 571         }
 572         if (answer)
 573                 goto out_permanent;
 574
 575         /* Add the new entry after the last permanent entry if any, so that
 576          * the new entry does not override a permanent entry when matched with
 577          * a wild-card protocol. But it is allowed to override any existing
 578          * non-permanent entry.  This means that when we remove this entry, the
 579          * system automatically returns to the old behavior.
 580          */
 581         list_add_rcu(&p->list, last_perm);
 582 out:
 583         spin_unlock_bh(&inetsw6_lock);
 584         return;
 585
 586 out_permanent:
 587         printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
 588                protocol);
 589         goto out;
 590
 591 out_illegal:
 592         printk(KERN_ERR
 593                "Ignoring attempt to register invalid socket type %d.\n",
 594                p->type);
 595         goto out;
 596 }
 597
 598 void
 599 inet6_unregister_protosw(struct inet_protosw *p)
 600 {
 601         if (INET_PROTOSW_PERMANENT & p->flags) {
 602                 printk(KERN_ERR
 603                        "Attempt to unregister permanent protocol %d.\n",
 604                        p->protocol);
 605         } else {
 606                 spin_lock_bh(&inetsw6_lock);
 607                 list_del_rcu(&p->list);
 608                 spin_unlock_bh(&inetsw6_lock);
 609
 610                 synchronize_net();
 611         }
 612 }
 613
 614 int inet6_sk_rebuild_header(struct sock *sk)
 615 {
 616         int err;
 617         struct dst_entry *dst;
 618         struct ipv6_pinfo *np = inet6_sk(sk);
 619
 620         dst = __sk_dst_check(sk, np->dst_cookie);
 621
 622         if (dst == NULL) {
 623                 struct inet_sock *inet = inet_sk(sk);
 624                 struct in6_addr *final_p = NULL, final;
 625                 struct flowi fl;
 626
 627                 memset(&fl, 0, sizeof(fl));
 628                 fl.proto = sk->sk_protocol;
 629                 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 630                 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
 631                 fl.fl6_flowlabel = np->flow_label;
 632                 fl.oif = sk->sk_bound_dev_if;
 633                 fl.fl_ip_dport = inet->dport;
 634                 fl.fl_ip_sport = inet->sport;
 635
 636                 if (np->opt && np->opt->srcrt) {
 637                         struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
 638                         ipv6_addr_copy(&final, &fl.fl6_dst);
 639                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 640                         final_p = &final;
 641                 }
 642
 643                 err = ip6_dst_lookup(sk, &dst, &fl);
 644                 if (err) {
 645                         sk->sk_route_caps = 0;
 646                         return err;
 647                 }
 648                 if (final_p)
 649                         ipv6_addr_copy(&fl.fl6_dst, final_p);
 650
 651                 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
 652                         sk->sk_err_soft = -err;
 653                         return err;
 654                 }
 655
 656                 ip6_dst_store(sk, dst, NULL);
 657                 sk->sk_route_caps = dst->dev->features &
 658                         ~(NETIF_F_IP_CSUM | NETIF_F_TSO);
 659         }
 660
 661         return 0;
 662 }
 663
 664 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
 665
 666 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
 667 {
 668         struct ipv6_pinfo *np = inet6_sk(sk);
 669         struct inet6_skb_parm *opt = IP6CB(skb);
 670
 671         if (np->rxopt.all) {
 672                 if ((opt->hop && (np->rxopt.bits.hopopts ||
 673                                   np->rxopt.bits.ohopopts)) ||
 674                     ((IPV6_FLOWINFO_MASK & *(u32*)skb->nh.raw) &&
 675                      np->rxopt.bits.rxflow) ||
 676                     (opt->srcrt && (np->rxopt.bits.srcrt ||
 677                      np->rxopt.bits.osrcrt)) ||
 678                     ((opt->dst1 || opt->dst0) &&
 679                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
 680                         return 1;
 681         }
 682         return 0;
 683 }
 684
 685 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
 686
 687 int
 688 snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign)
 689 {
 690         if (ptr == NULL)
 691                 return -EINVAL;
 692
 693         ptr[0] = __alloc_percpu(mibsize);
 694         if (!ptr[0])
 695                 goto err0;
 696
 697         ptr[1] = __alloc_percpu(mibsize);
 698         if (!ptr[1])
 699                 goto err1;
 700
 701         return 0;
 702
 703 err1:
 704         free_percpu(ptr[0]);
 705         ptr[0] = NULL;
 706 err0:
 707         return -ENOMEM;
 708 }
 709
 710 void
 711 snmp6_mib_free(void *ptr[2])
 712 {
 713         if (ptr == NULL)
 714                 return;
 715         if (ptr[0])
 716                 free_percpu(ptr[0]);
 717         if (ptr[1])
 718                 free_percpu(ptr[1]);
 719         ptr[0] = ptr[1] = NULL;
 720 }
 721
 722 static int __init init_ipv6_mibs(void)
 723 {
 724         if (snmp6_mib_init((void **)ipv6_statistics, sizeof (struct ipstats_mib),
 725                            __alignof__(struct ipstats_mib)) < 0)
 726                 goto err_ip_mib;
 727         if (snmp6_mib_init((void **)icmpv6_statistics, sizeof (struct icmpv6_mib),
 728                            __alignof__(struct icmpv6_mib)) < 0)
 729                 goto err_icmp_mib;
 730         if (snmp6_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib),
 731                            __alignof__(struct udp_mib)) < 0)
 732                 goto err_udp_mib;
 733         return 0;
 734
 735 err_udp_mib:
 736         snmp6_mib_free((void **)icmpv6_statistics);
 737 err_icmp_mib:
 738         snmp6_mib_free((void **)ipv6_statistics);
 739 err_ip_mib:
 740         return -ENOMEM;
 741
 742 }
 743
 744 static void cleanup_ipv6_mibs(void)
 745 {
 746         snmp6_mib_free((void **)ipv6_statistics);
 747         snmp6_mib_free((void **)icmpv6_statistics);
 748         snmp6_mib_free((void **)udp_stats_in6);
 749 }
 750
 751 static int __init inet6_init(void)
 752 {
 753         struct sk_buff *dummy_skb;
 754         struct list_head *r;
 755         int err;
 756
 757 #ifdef MODULE
 758 #if 0 /* FIXME --RR */
 759         if (!mod_member_present(&__this_module, can_unload))
 760           return -EINVAL;
 761
 762         __this_module.can_unload = &ipv6_unload;
 763 #endif
 764 #endif
 765
 766         if (sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb)) {
 767                 printk(KERN_CRIT "inet6_proto_init: size fault\n");
 768                 return -EINVAL;
 769         }
 770
 771         err = proto_register(&tcpv6_prot, 1);
 772         if (err)
 773                 goto out;
 774
 775         err = proto_register(&udpv6_prot, 1);
 776         if (err)
 777                 goto out_unregister_tcp_proto;
 778
 779         err = proto_register(&rawv6_prot, 1);
 780         if (err)
 781                 goto out_unregister_udp_proto;
 782
 783
 784         /* Register the socket-side information for inet6_create.  */
 785         for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
 786                 INIT_LIST_HEAD(r);
 787
 788         /* We MUST register RAW sockets before we create the ICMP6,
 789          * IGMP6, or NDISC control sockets.
 790          */
 791         inet6_register_protosw(&rawv6_protosw);
 792
 793         /* Register the family here so that the init calls below will
 794          * be able to create sockets. (?? is this dangerous ??)
 795          */
 796         err = sock_register(&inet6_family_ops);
 797         if (err)
 798                 goto out_unregister_raw_proto;
 799
 800         /* Initialise ipv6 mibs */
 801         err = init_ipv6_mibs();
 802         if (err)
 803                 goto out_unregister_sock;
 804
 805         /*
 806          *      ipngwg API draft makes clear that the correct semantics
 807          *      for TCP and UDP is to consider one TCP and UDP instance
 808          *      in a host availiable by both INET and INET6 APIs and
 809          *      able to communicate via both network protocols.
 810          */
 811
 812 #ifdef CONFIG_SYSCTL
 813         ipv6_sysctl_register();
 814 #endif
 815         err = icmpv6_init(&inet6_family_ops);
 816         if (err)
 817                 goto icmp_fail;
 818         err = ndisc_init(&inet6_family_ops);
 819         if (err)
 820                 goto ndisc_fail;
 821         err = igmp6_init(&inet6_family_ops);
 822         if (err)
 823                 goto igmp_fail;
 824         err = ipv6_netfilter_init();
 825         if (err)
 826                 goto netfilter_fail;
 827         /* Create /proc/foo6 entries. */
 828 #ifdef CONFIG_PROC_FS
 829         err = -ENOMEM;
 830         if (raw6_proc_init())
 831                 goto proc_raw6_fail;
 832         if (tcp6_proc_init())
 833                 goto proc_tcp6_fail;
 834         if (udp6_proc_init())
 835                 goto proc_udp6_fail;
 836         if (ipv6_misc_proc_init())
 837                 goto proc_misc6_fail;
 838
 839         if (ac6_proc_init())
 840                 goto proc_anycast6_fail;
 841         if (if6_proc_init())
 842                 goto proc_if6_fail;
 843 #endif
 844         ip6_route_init();
 845         ip6_flowlabel_init();
 846         err = addrconf_init();
 847         if (err)
 848                 goto addrconf_fail;
 849         sit_init();
 850
 851         /* Init v6 extension headers. */
 852         ipv6_rthdr_init();
 853         ipv6_frag_init();
 854         ipv6_nodata_init();
 855         ipv6_destopt_init();
 856
 857         /* Init v6 transport protocols. */
 858         udpv6_init();
 859         tcpv6_init();
 860
 861         ipv6_packet_init();
 862         err = 0;
 863 out:
 864         return err;
 865
 866 addrconf_fail:
 867         ip6_flowlabel_cleanup();
 868         ip6_route_cleanup();
 869 #ifdef CONFIG_PROC_FS
 870         if6_proc_exit();
 871 proc_if6_fail:
 872         ac6_proc_exit();
 873 proc_anycast6_fail:
 874         ipv6_misc_proc_exit();
 875 proc_misc6_fail:
 876         udp6_proc_exit();
 877 proc_udp6_fail:
 878         tcp6_proc_exit();
 879 proc_tcp6_fail:
 880         raw6_proc_exit();
 881 proc_raw6_fail:
 882 #endif
 883         ipv6_netfilter_fini();
 884 netfilter_fail:
 885         igmp6_cleanup();
 886 igmp_fail:
 887         ndisc_cleanup();
 888 ndisc_fail:
 889         icmpv6_cleanup();
 890 icmp_fail:
 891 #ifdef CONFIG_SYSCTL
 892         ipv6_sysctl_unregister();
 893 #endif
 894         cleanup_ipv6_mibs();
 895 out_unregister_sock:
 896         sock_unregister(PF_INET6);
 897 out_unregister_raw_proto:
 898         proto_unregister(&rawv6_prot);
 899 out_unregister_udp_proto:
 900         proto_unregister(&udpv6_prot);
 901 out_unregister_tcp_proto:
 902         proto_unregister(&tcpv6_prot);
 903         goto out;
 904 }
 905 module_init(inet6_init);
 906
 907 static void __exit inet6_exit(void)
 908 {
 909         /* First of all disallow new sockets creation. */
 910         sock_unregister(PF_INET6);
 911 #ifdef CONFIG_PROC_FS
 912         if6_proc_exit();
 913         ac6_proc_exit();
 914         ipv6_misc_proc_exit();
 915         udp6_proc_exit();
 916         tcp6_proc_exit();
 917         raw6_proc_exit();
 918 #endif
 919         /* Cleanup code parts. */
 920         sit_cleanup();
 921         ip6_flowlabel_cleanup();
 922         addrconf_cleanup();
 923         ip6_route_cleanup();
 924         ipv6_packet_cleanup();
 925         igmp6_cleanup();
 926         ipv6_netfilter_fini();
 927         ndisc_cleanup();
 928         icmpv6_cleanup();
 929 #ifdef CONFIG_SYSCTL
 930         ipv6_sysctl_unregister();
 931 #endif
 932         cleanup_ipv6_mibs();
 933         proto_unregister(&rawv6_prot);
 934         proto_unregister(&udpv6_prot);
 935         proto_unregister(&tcpv6_prot);
 936 }
 937 module_exit(inet6_exit);
 938
 939 MODULE_ALIAS_NETPROTO(PF_INET6);