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  *      Fixes:
  11  *      piggy, Karl Knutson     :       Socket protocol table
  12  *      Hideaki YOSHIFUJI       :       sin6_scope_id support
  13  *      Arnaldo Melo            :       check proc_net_create return, cleanups
  14  *
  15  *      This program is free software; you can redistribute it and/or
  16  *      modify it under the terms of the GNU General Public License
  17  *      as published by the Free Software Foundation; either version
  18  *      2 of the License, or (at your option) any later version.
  19  */
  20
  21
  22 #include <linux/module.h>
  23 #include <linux/capability.h>
  24 #include <linux/errno.h>
  25 #include <linux/types.h>
  26 #include <linux/socket.h>
  27 #include <linux/in.h>
  28 #include <linux/kernel.h>
  29 #include <linux/timer.h>
  30 #include <linux/string.h>
  31 #include <linux/sockios.h>
  32 #include <linux/net.h>
  33 #include <linux/fcntl.h>
  34 #include <linux/mm.h>
  35 #include <linux/interrupt.h>
  36 #include <linux/proc_fs.h>
  37 #include <linux/stat.h>
  38 #include <linux/init.h>
  39
  40 #include <linux/inet.h>
  41 #include <linux/netdevice.h>
  42 #include <linux/icmpv6.h>
  43 #include <linux/netfilter_ipv6.h>
  44
  45 #include <net/ip.h>
  46 #include <net/ipv6.h>
  47 #include <net/udp.h>
  48 #include <net/udplite.h>
  49 #include <net/tcp.h>
  50 #include <net/ipip.h>
  51 #include <net/protocol.h>
  52 #include <net/inet_common.h>
  53 #include <net/transp_v6.h>
  54 #include <net/ip6_route.h>
  55 #include <net/addrconf.h>
  56 #ifdef CONFIG_IPV6_TUNNEL
  57 #include <net/ip6_tunnel.h>
  58 #endif
  59
  60 #include <asm/uaccess.h>
  61 #include <asm/system.h>
  62 #include <linux/mroute6.h>
  63
  64 MODULE_AUTHOR("Cast of dozens");
  65 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
  66 MODULE_LICENSE("GPL");
  67
  68 /* The inetsw6 table contains everything that inet6_create needs to
  69  * build a new socket.
  70  */
  71 static struct list_head inetsw6[SOCK_MAX];
  72 static DEFINE_SPINLOCK(inetsw6_lock);
  73
  74 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
  75 {
  76         const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
  77
  78         return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
  79 }
  80
  81 static int inet6_create(struct net *net, struct socket *sock, int protocol)
  82 {
  83         struct inet_sock *inet;
  84         struct ipv6_pinfo *np;
  85         struct sock *sk;
  86         struct list_head *p;
  87         struct inet_protosw *answer;
  88         struct proto *answer_prot;
  89         unsigned char answer_flags;
  90         char answer_no_check;
  91         int try_loading_module = 0;
  92         int err;
  93
  94         if (sock->type != SOCK_RAW &&
  95             sock->type != SOCK_DGRAM &&
  96             !inet_ehash_secret)
  97                 build_ehash_secret();
  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(net, PF_INET6, GFP_KERNEL, answer_prot);
 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) != 0;
 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    = net->ipv6.sysctl.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 = htons(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         struct net *net = sock_net(sk);
 248         __be32 v4addr = 0;
 249         unsigned short snum;
 250         int addr_type = 0;
 251         int err = 0;
 252
 253         /* If the socket has its own bind function then use it. */
 254         if (sk->sk_prot->bind)
 255                 return sk->sk_prot->bind(sk, uaddr, addr_len);
 256
 257         if (addr_len < SIN6_LEN_RFC2133)
 258                 return -EINVAL;
 259         addr_type = ipv6_addr_type(&addr->sin6_addr);
 260         if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
 261                 return -EINVAL;
 262
 263         snum = ntohs(addr->sin6_port);
 264         if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
 265                 return -EACCES;
 266
 267         lock_sock(sk);
 268
 269         /* Check these errors (active socket, double bind). */
 270         if (sk->sk_state != TCP_CLOSE || inet->num) {
 271                 err = -EINVAL;
 272                 goto out;
 273         }
 274
 275         /* Check if the address belongs to the host. */
 276         if (addr_type == IPV6_ADDR_MAPPED) {
 277                 v4addr = addr->sin6_addr.s6_addr32[3];
 278                 if (inet_addr_type(net, v4addr) != RTN_LOCAL) {
 279                         err = -EADDRNOTAVAIL;
 280                         goto out;
 281                 }
 282         } else {
 283                 if (addr_type != IPV6_ADDR_ANY) {
 284                         struct net_device *dev = NULL;
 285
 286                         if (addr_type & IPV6_ADDR_LINKLOCAL) {
 287                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 288                                     addr->sin6_scope_id) {
 289                                         /* Override any existing binding, if another one
 290                                          * is supplied by user.
 291                                          */
 292                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
 293                                 }
 294
 295                                 /* Binding to link-local address requires an interface */
 296                                 if (!sk->sk_bound_dev_if) {
 297                                         err = -EINVAL;
 298                                         goto out;
 299                                 }
 300                                 dev = dev_get_by_index(net, sk->sk_bound_dev_if);
 301                                 if (!dev) {
 302                                         err = -ENODEV;
 303                                         goto out;
 304                                 }
 305                         }
 306
 307                         /* ipv4 addr of the socket is invalid.  Only the
 308                          * unspecified and mapped address have a v4 equivalent.
 309                          */
 310                         v4addr = LOOPBACK4_IPV6;
 311                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
 312                                 if (!ipv6_chk_addr(net, &addr->sin6_addr,
 313                                                    dev, 0)) {
 314                                         if (dev)
 315                                                 dev_put(dev);
 316                                         err = -EADDRNOTAVAIL;
 317                                         goto out;
 318                                 }
 319                         }
 320                         if (dev)
 321                                 dev_put(dev);
 322                 }
 323         }
 324
 325         inet->rcv_saddr = v4addr;
 326         inet->saddr = v4addr;
 327
 328         ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
 329
 330         if (!(addr_type & IPV6_ADDR_MULTICAST))
 331                 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
 332
 333         /* Make sure we are allowed to bind here. */
 334         if (sk->sk_prot->get_port(sk, snum)) {
 335                 inet_reset_saddr(sk);
 336                 err = -EADDRINUSE;
 337                 goto out;
 338         }
 339
 340         if (addr_type != IPV6_ADDR_ANY)
 341                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
 342         if (snum)
 343                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
 344         inet->sport = htons(inet->num);
 345         inet->dport = 0;
 346         inet->daddr = 0;
 347 out:
 348         release_sock(sk);
 349         return err;
 350 }
 351
 352 EXPORT_SYMBOL(inet6_bind);
 353
 354 int inet6_release(struct socket *sock)
 355 {
 356         struct sock *sk = sock->sk;
 357
 358         if (sk == NULL)
 359                 return -EINVAL;
 360
 361         /* Free mc lists */
 362         ipv6_sock_mc_close(sk);
 363
 364         /* Free ac lists */
 365         ipv6_sock_ac_close(sk);
 366
 367         return inet_release(sock);
 368 }
 369
 370 EXPORT_SYMBOL(inet6_release);
 371
 372 void inet6_destroy_sock(struct sock *sk)
 373 {
 374         struct ipv6_pinfo *np = inet6_sk(sk);
 375         struct sk_buff *skb;
 376         struct ipv6_txoptions *opt;
 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
 392 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
 393
 394 /*
 395  *      This does both peername and sockname.
 396  */
 397
 398 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 399                  int *uaddr_len, int peer)
 400 {
 401         struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
 402         struct sock *sk = sock->sk;
 403         struct inet_sock *inet = inet_sk(sk);
 404         struct ipv6_pinfo *np = inet6_sk(sk);
 405
 406         sin->sin6_family = AF_INET6;
 407         sin->sin6_flowinfo = 0;
 408         sin->sin6_scope_id = 0;
 409         if (peer) {
 410                 if (!inet->dport)
 411                         return -ENOTCONN;
 412                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
 413                     peer == 1)
 414                         return -ENOTCONN;
 415                 sin->sin6_port = inet->dport;
 416                 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
 417                 if (np->sndflow)
 418                         sin->sin6_flowinfo = np->flow_label;
 419         } else {
 420                 if (ipv6_addr_any(&np->rcv_saddr))
 421                         ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
 422                 else
 423                         ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
 424
 425                 sin->sin6_port = inet->sport;
 426         }
 427         if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
 428                 sin->sin6_scope_id = sk->sk_bound_dev_if;
 429         *uaddr_len = sizeof(*sin);
 430         return(0);
 431 }
 432
 433 EXPORT_SYMBOL(inet6_getname);
 434
 435 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 436 {
 437         struct sock *sk = sock->sk;
 438         struct net *net = sock_net(sk);
 439
 440         switch(cmd)
 441         {
 442         case SIOCGSTAMP:
 443                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
 444
 445         case SIOCGSTAMPNS:
 446                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
 447
 448         case SIOCADDRT:
 449         case SIOCDELRT:
 450
 451                 return(ipv6_route_ioctl(net, cmd, (void __user *)arg));
 452
 453         case SIOCSIFADDR:
 454                 return addrconf_add_ifaddr(net, (void __user *) arg);
 455         case SIOCDIFADDR:
 456                 return addrconf_del_ifaddr(net, (void __user *) arg);
 457         case SIOCSIFDSTADDR:
 458                 return addrconf_set_dstaddr(net, (void __user *) arg);
 459         default:
 460                 if (!sk->sk_prot->ioctl)
 461                         return -ENOIOCTLCMD;
 462                 return sk->sk_prot->ioctl(sk, cmd, arg);
 463         }
 464         /*NOTREACHED*/
 465         return(0);
 466 }
 467
 468 EXPORT_SYMBOL(inet6_ioctl);
 469
 470 const struct proto_ops inet6_stream_ops = {
 471         .family            = PF_INET6,
 472         .owner             = THIS_MODULE,
 473         .release           = inet6_release,
 474         .bind              = inet6_bind,
 475         .connect           = inet_stream_connect,       /* ok           */
 476         .socketpair        = sock_no_socketpair,        /* a do nothing */
 477         .accept            = inet_accept,               /* ok           */
 478         .getname           = inet6_getname,
 479         .poll              = tcp_poll,                  /* ok           */
 480         .ioctl             = inet6_ioctl,               /* must change  */
 481         .listen            = inet_listen,               /* ok           */
 482         .shutdown          = inet_shutdown,             /* ok           */
 483         .setsockopt        = sock_common_setsockopt,    /* ok           */
 484         .getsockopt        = sock_common_getsockopt,    /* ok           */
 485         .sendmsg           = tcp_sendmsg,               /* ok           */
 486         .recvmsg           = sock_common_recvmsg,       /* ok           */
 487         .mmap              = sock_no_mmap,
 488         .sendpage          = tcp_sendpage,
 489         .splice_read       = tcp_splice_read,
 490 #ifdef CONFIG_COMPAT
 491         .compat_setsockopt = compat_sock_common_setsockopt,
 492         .compat_getsockopt = compat_sock_common_getsockopt,
 493 #endif
 494 };
 495
 496 const struct proto_ops inet6_dgram_ops = {
 497         .family            = PF_INET6,
 498         .owner             = THIS_MODULE,
 499         .release           = inet6_release,
 500         .bind              = inet6_bind,
 501         .connect           = inet_dgram_connect,        /* ok           */
 502         .socketpair        = sock_no_socketpair,        /* a do nothing */
 503         .accept            = sock_no_accept,            /* a do nothing */
 504         .getname           = inet6_getname,
 505         .poll              = udp_poll,                  /* ok           */
 506         .ioctl             = inet6_ioctl,               /* must change  */
 507         .listen            = sock_no_listen,            /* ok           */
 508         .shutdown          = inet_shutdown,             /* ok           */
 509         .setsockopt        = sock_common_setsockopt,    /* ok           */
 510         .getsockopt        = sock_common_getsockopt,    /* ok           */
 511         .sendmsg           = inet_sendmsg,              /* ok           */
 512         .recvmsg           = sock_common_recvmsg,       /* ok           */
 513         .mmap              = sock_no_mmap,
 514         .sendpage          = sock_no_sendpage,
 515 #ifdef CONFIG_COMPAT
 516         .compat_setsockopt = compat_sock_common_setsockopt,
 517         .compat_getsockopt = compat_sock_common_getsockopt,
 518 #endif
 519 };
 520
 521 static struct net_proto_family inet6_family_ops = {
 522         .family = PF_INET6,
 523         .create = inet6_create,
 524         .owner  = THIS_MODULE,
 525 };
 526
 527 int inet6_register_protosw(struct inet_protosw *p)
 528 {
 529         struct list_head *lh;
 530         struct inet_protosw *answer;
 531         struct list_head *last_perm;
 532         int protocol = p->protocol;
 533         int ret;
 534
 535         spin_lock_bh(&inetsw6_lock);
 536
 537         ret = -EINVAL;
 538         if (p->type >= SOCK_MAX)
 539                 goto out_illegal;
 540
 541         /* If we are trying to override a permanent protocol, bail. */
 542         answer = NULL;
 543         ret = -EPERM;
 544         last_perm = &inetsw6[p->type];
 545         list_for_each(lh, &inetsw6[p->type]) {
 546                 answer = list_entry(lh, struct inet_protosw, list);
 547
 548                 /* Check only the non-wild match. */
 549                 if (INET_PROTOSW_PERMANENT & answer->flags) {
 550                         if (protocol == answer->protocol)
 551                                 break;
 552                         last_perm = lh;
 553                 }
 554
 555                 answer = NULL;
 556         }
 557         if (answer)
 558                 goto out_permanent;
 559
 560         /* Add the new entry after the last permanent entry if any, so that
 561          * the new entry does not override a permanent entry when matched with
 562          * a wild-card protocol. But it is allowed to override any existing
 563          * non-permanent entry.  This means that when we remove this entry, the
 564          * system automatically returns to the old behavior.
 565          */
 566         list_add_rcu(&p->list, last_perm);
 567         ret = 0;
 568 out:
 569         spin_unlock_bh(&inetsw6_lock);
 570         return ret;
 571
 572 out_permanent:
 573         printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
 574                protocol);
 575         goto out;
 576
 577 out_illegal:
 578         printk(KERN_ERR
 579                "Ignoring attempt to register invalid socket type %d.\n",
 580                p->type);
 581         goto out;
 582 }
 583
 584 EXPORT_SYMBOL(inet6_register_protosw);
 585
 586 void
 587 inet6_unregister_protosw(struct inet_protosw *p)
 588 {
 589         if (INET_PROTOSW_PERMANENT & p->flags) {
 590                 printk(KERN_ERR
 591                        "Attempt to unregister permanent protocol %d.\n",
 592                        p->protocol);
 593         } else {
 594                 spin_lock_bh(&inetsw6_lock);
 595                 list_del_rcu(&p->list);
 596                 spin_unlock_bh(&inetsw6_lock);
 597
 598                 synchronize_net();
 599         }
 600 }
 601
 602 EXPORT_SYMBOL(inet6_unregister_protosw);
 603
 604 int inet6_sk_rebuild_header(struct sock *sk)
 605 {
 606         int err;
 607         struct dst_entry *dst;
 608         struct ipv6_pinfo *np = inet6_sk(sk);
 609
 610         dst = __sk_dst_check(sk, np->dst_cookie);
 611
 612         if (dst == NULL) {
 613                 struct inet_sock *inet = inet_sk(sk);
 614                 struct in6_addr *final_p = NULL, final;
 615                 struct flowi fl;
 616
 617                 memset(&fl, 0, sizeof(fl));
 618                 fl.proto = sk->sk_protocol;
 619                 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 620                 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
 621                 fl.fl6_flowlabel = np->flow_label;
 622                 fl.oif = sk->sk_bound_dev_if;
 623                 fl.fl_ip_dport = inet->dport;
 624                 fl.fl_ip_sport = inet->sport;
 625                 security_sk_classify_flow(sk, &fl);
 626
 627                 if (np->opt && np->opt->srcrt) {
 628                         struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
 629                         ipv6_addr_copy(&final, &fl.fl6_dst);
 630                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 631                         final_p = &final;
 632                 }
 633
 634                 err = ip6_dst_lookup(sk, &dst, &fl);
 635                 if (err) {
 636                         sk->sk_route_caps = 0;
 637                         return err;
 638                 }
 639                 if (final_p)
 640                         ipv6_addr_copy(&fl.fl6_dst, final_p);
 641
 642                 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
 643                         sk->sk_err_soft = -err;
 644                         return err;
 645                 }
 646
 647                 __ip6_dst_store(sk, dst, NULL, NULL);
 648         }
 649
 650         return 0;
 651 }
 652
 653 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
 654
 655 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
 656 {
 657         struct ipv6_pinfo *np = inet6_sk(sk);
 658         struct inet6_skb_parm *opt = IP6CB(skb);
 659
 660         if (np->rxopt.all) {
 661                 if ((opt->hop && (np->rxopt.bits.hopopts ||
 662                                   np->rxopt.bits.ohopopts)) ||
 663                     ((IPV6_FLOWINFO_MASK &
 664                       *(__be32 *)skb_network_header(skb)) &&
 665                      np->rxopt.bits.rxflow) ||
 666                     (opt->srcrt && (np->rxopt.bits.srcrt ||
 667                      np->rxopt.bits.osrcrt)) ||
 668                     ((opt->dst1 || opt->dst0) &&
 669                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
 670                         return 1;
 671         }
 672         return 0;
 673 }
 674
 675 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
 676
 677 static struct inet6_protocol *ipv6_gso_pull_exthdrs(struct sk_buff *skb,
 678                                                     int proto)
 679 {
 680         struct inet6_protocol *ops = NULL;
 681
 682         for (;;) {
 683                 struct ipv6_opt_hdr *opth;
 684                 int len;
 685
 686                 if (proto != NEXTHDR_HOP) {
 687                         ops = rcu_dereference(inet6_protos[proto]);
 688
 689                         if (unlikely(!ops))
 690                                 break;
 691
 692                         if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
 693                                 break;
 694                 }
 695
 696                 if (unlikely(!pskb_may_pull(skb, 8)))
 697                         break;
 698
 699                 opth = (void *)skb->data;
 700                 len = ipv6_optlen(opth);
 701
 702                 if (unlikely(!pskb_may_pull(skb, len)))
 703                         break;
 704
 705                 proto = opth->nexthdr;
 706                 __skb_pull(skb, len);
 707         }
 708
 709         return ops;
 710 }
 711
 712 static int ipv6_gso_send_check(struct sk_buff *skb)
 713 {
 714         struct ipv6hdr *ipv6h;
 715         struct inet6_protocol *ops;
 716         int err = -EINVAL;
 717
 718         if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
 719                 goto out;
 720
 721         ipv6h = ipv6_hdr(skb);
 722         __skb_pull(skb, sizeof(*ipv6h));
 723         err = -EPROTONOSUPPORT;
 724
 725         rcu_read_lock();
 726         ops = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
 727         if (likely(ops && ops->gso_send_check)) {
 728                 skb_reset_transport_header(skb);
 729                 err = ops->gso_send_check(skb);
 730         }
 731         rcu_read_unlock();
 732
 733 out:
 734         return err;
 735 }
 736
 737 static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features)
 738 {
 739         struct sk_buff *segs = ERR_PTR(-EINVAL);
 740         struct ipv6hdr *ipv6h;
 741         struct inet6_protocol *ops;
 742
 743         if (!(features & NETIF_F_V6_CSUM))
 744                 features &= ~NETIF_F_SG;
 745
 746         if (unlikely(skb_shinfo(skb)->gso_type &
 747                      ~(SKB_GSO_UDP |
 748                        SKB_GSO_DODGY |
 749                        SKB_GSO_TCP_ECN |
 750                        SKB_GSO_TCPV6 |
 751                        0)))
 752                 goto out;
 753
 754         if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
 755                 goto out;
 756
 757         ipv6h = ipv6_hdr(skb);
 758         __skb_pull(skb, sizeof(*ipv6h));
 759         segs = ERR_PTR(-EPROTONOSUPPORT);
 760
 761         rcu_read_lock();
 762         ops = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
 763         if (likely(ops && ops->gso_segment)) {
 764                 skb_reset_transport_header(skb);
 765                 segs = ops->gso_segment(skb, features);
 766         }
 767         rcu_read_unlock();
 768
 769         if (unlikely(IS_ERR(segs)))
 770                 goto out;
 771
 772         for (skb = segs; skb; skb = skb->next) {
 773                 ipv6h = ipv6_hdr(skb);
 774                 ipv6h->payload_len = htons(skb->len - skb->mac_len -
 775                                            sizeof(*ipv6h));
 776         }
 777
 778 out:
 779         return segs;
 780 }
 781
 782 static struct packet_type ipv6_packet_type = {
 783         .type = __constant_htons(ETH_P_IPV6),
 784         .func = ipv6_rcv,
 785         .gso_send_check = ipv6_gso_send_check,
 786         .gso_segment = ipv6_gso_segment,
 787 };
 788
 789 static int __init ipv6_packet_init(void)
 790 {
 791         dev_add_pack(&ipv6_packet_type);
 792         return 0;
 793 }
 794
 795 static void ipv6_packet_cleanup(void)
 796 {
 797         dev_remove_pack(&ipv6_packet_type);
 798 }
 799
 800 static int __init init_ipv6_mibs(void)
 801 {
 802         if (snmp_mib_init((void **)ipv6_statistics,
 803                           sizeof(struct ipstats_mib)) < 0)
 804                 goto err_ip_mib;
 805         if (snmp_mib_init((void **)icmpv6_statistics,
 806                           sizeof(struct icmpv6_mib)) < 0)
 807                 goto err_icmp_mib;
 808         if (snmp_mib_init((void **)icmpv6msg_statistics,
 809                           sizeof(struct icmpv6msg_mib)) < 0)
 810                 goto err_icmpmsg_mib;
 811         if (snmp_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib)) < 0)
 812                 goto err_udp_mib;
 813         if (snmp_mib_init((void **)udplite_stats_in6,
 814                           sizeof (struct udp_mib)) < 0)
 815                 goto err_udplite_mib;
 816         return 0;
 817
 818 err_udplite_mib:
 819         snmp_mib_free((void **)udp_stats_in6);
 820 err_udp_mib:
 821         snmp_mib_free((void **)icmpv6msg_statistics);
 822 err_icmpmsg_mib:
 823         snmp_mib_free((void **)icmpv6_statistics);
 824 err_icmp_mib:
 825         snmp_mib_free((void **)ipv6_statistics);
 826 err_ip_mib:
 827         return -ENOMEM;
 828
 829 }
 830
 831 static void cleanup_ipv6_mibs(void)
 832 {
 833         snmp_mib_free((void **)ipv6_statistics);
 834         snmp_mib_free((void **)icmpv6_statistics);
 835         snmp_mib_free((void **)icmpv6msg_statistics);
 836         snmp_mib_free((void **)udp_stats_in6);
 837         snmp_mib_free((void **)udplite_stats_in6);
 838 }
 839
 840 static int inet6_net_init(struct net *net)
 841 {
 842         int err = 0;
 843
 844         net->ipv6.sysctl.bindv6only = 0;
 845         net->ipv6.sysctl.flush_delay = 0;
 846         net->ipv6.sysctl.ip6_rt_max_size = 4096;
 847         net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
 848         net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
 849         net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
 850         net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
 851         net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
 852         net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
 853         net->ipv6.sysctl.icmpv6_time = 1*HZ;
 854
 855 #ifdef CONFIG_PROC_FS
 856         err = udp6_proc_init(net);
 857         if (err)
 858                 goto out;
 859         err = tcp6_proc_init(net);
 860         if (err)
 861                 goto proc_tcp6_fail;
 862         err = ac6_proc_init(net);
 863         if (err)
 864                 goto proc_ac6_fail;
 865 out:
 866 #endif
 867         return err;
 868
 869 #ifdef CONFIG_PROC_FS
 870 proc_ac6_fail:
 871         tcp6_proc_exit(net);
 872 proc_tcp6_fail:
 873         udp6_proc_exit(net);
 874         goto out;
 875 #endif
 876 }
 877
 878 static void inet6_net_exit(struct net *net)
 879 {
 880 #ifdef CONFIG_PROC_FS
 881         udp6_proc_exit(net);
 882         tcp6_proc_exit(net);
 883         ac6_proc_exit(net);
 884 #endif
 885 }
 886
 887 static struct pernet_operations inet6_net_ops = {
 888         .init = inet6_net_init,
 889         .exit = inet6_net_exit,
 890 };
 891
 892 static int __init inet6_init(void)
 893 {
 894         struct sk_buff *dummy_skb;
 895         struct list_head *r;
 896         int err;
 897
 898         BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
 899
 900         err = proto_register(&tcpv6_prot, 1);
 901         if (err)
 902                 goto out;
 903
 904         err = proto_register(&udpv6_prot, 1);
 905         if (err)
 906                 goto out_unregister_tcp_proto;
 907
 908         err = proto_register(&udplitev6_prot, 1);
 909         if (err)
 910                 goto out_unregister_udp_proto;
 911
 912         err = proto_register(&rawv6_prot, 1);
 913         if (err)
 914                 goto out_unregister_udplite_proto;
 915
 916
 917         /* Register the socket-side information for inet6_create.  */
 918         for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
 919                 INIT_LIST_HEAD(r);
 920
 921         /* We MUST register RAW sockets before we create the ICMP6,
 922          * IGMP6, or NDISC control sockets.
 923          */
 924         err = rawv6_init();
 925         if (err)
 926                 goto out_unregister_raw_proto;
 927
 928         /* Register the family here so that the init calls below will
 929          * be able to create sockets. (?? is this dangerous ??)
 930          */
 931         err = sock_register(&inet6_family_ops);
 932         if (err)
 933                 goto out_sock_register_fail;
 934
 935         /* Initialise ipv6 mibs */
 936         err = init_ipv6_mibs();
 937         if (err)
 938                 goto out_unregister_sock;
 939
 940         /*
 941          *      ipngwg API draft makes clear that the correct semantics
 942          *      for TCP and UDP is to consider one TCP and UDP instance
 943          *      in a host availiable by both INET and INET6 APIs and
 944          *      able to communicate via both network protocols.
 945          */
 946
 947         err = register_pernet_subsys(&inet6_net_ops);
 948         if (err)
 949                 goto register_pernet_fail;
 950         err = icmpv6_init();
 951         if (err)
 952                 goto icmp_fail;
 953         err = ip6_mr_init();
 954         if (err)
 955                 goto ipmr_fail;
 956         err = ndisc_init();
 957         if (err)
 958                 goto ndisc_fail;
 959         err = igmp6_init();
 960         if (err)
 961                 goto igmp_fail;
 962         err = ipv6_netfilter_init();
 963         if (err)
 964                 goto netfilter_fail;
 965         /* Create /proc/foo6 entries. */
 966 #ifdef CONFIG_PROC_FS
 967         err = -ENOMEM;
 968         if (raw6_proc_init())
 969                 goto proc_raw6_fail;
 970         if (udplite6_proc_init())
 971                 goto proc_udplite6_fail;
 972         if (ipv6_misc_proc_init())
 973                 goto proc_misc6_fail;
 974         if (if6_proc_init())
 975                 goto proc_if6_fail;
 976 #endif
 977         err = ip6_route_init();
 978         if (err)
 979                 goto ip6_route_fail;
 980         err = ip6_flowlabel_init();
 981         if (err)
 982                 goto ip6_flowlabel_fail;
 983         err = addrconf_init();
 984         if (err)
 985                 goto addrconf_fail;
 986
 987         /* Init v6 extension headers. */
 988         err = ipv6_exthdrs_init();
 989         if (err)
 990                 goto ipv6_exthdrs_fail;
 991
 992         err = ipv6_frag_init();
 993         if (err)
 994                 goto ipv6_frag_fail;
 995
 996         /* Init v6 transport protocols. */
 997         err = udpv6_init();
 998         if (err)
 999                 goto udpv6_fail;
1000
1001         err = udplitev6_init();
1002         if (err)
1003                 goto udplitev6_fail;
1004
1005         err = tcpv6_init();
1006         if (err)
1007                 goto tcpv6_fail;
1008
1009         err = ipv6_packet_init();
1010         if (err)
1011                 goto ipv6_packet_fail;
1012
1013 #ifdef CONFIG_SYSCTL
1014         err = ipv6_sysctl_register();
1015         if (err)
1016                 goto sysctl_fail;
1017 #endif
1018 out:
1019         return err;
1020
1021 #ifdef CONFIG_SYSCTL
1022 sysctl_fail:
1023         ipv6_packet_cleanup();
1024 #endif
1025 ipv6_packet_fail:
1026         tcpv6_exit();
1027 tcpv6_fail:
1028         udplitev6_exit();
1029 udplitev6_fail:
1030         udpv6_exit();
1031 udpv6_fail:
1032         ipv6_frag_exit();
1033 ipv6_frag_fail:
1034         ipv6_exthdrs_exit();
1035 ipv6_exthdrs_fail:
1036         addrconf_cleanup();
1037 addrconf_fail:
1038         ip6_flowlabel_cleanup();
1039 ip6_flowlabel_fail:
1040         ip6_route_cleanup();
1041 ip6_route_fail:
1042 #ifdef CONFIG_PROC_FS
1043         if6_proc_exit();
1044 proc_if6_fail:
1045         ipv6_misc_proc_exit();
1046 proc_misc6_fail:
1047         udplite6_proc_exit();
1048 proc_udplite6_fail:
1049         raw6_proc_exit();
1050 proc_raw6_fail:
1051 #endif
1052         ipv6_netfilter_fini();
1053 netfilter_fail:
1054         igmp6_cleanup();
1055 igmp_fail:
1056         ndisc_cleanup();
1057 ndisc_fail:
1058         ip6_mr_cleanup();
1059 ipmr_fail:
1060         icmpv6_cleanup();
1061 icmp_fail:
1062         unregister_pernet_subsys(&inet6_net_ops);
1063 register_pernet_fail:
1064         cleanup_ipv6_mibs();
1065 out_unregister_sock:
1066         sock_unregister(PF_INET6);
1067         rtnl_unregister_all(PF_INET6);
1068 out_sock_register_fail:
1069         rawv6_exit();
1070 out_unregister_raw_proto:
1071         proto_unregister(&rawv6_prot);
1072 out_unregister_udplite_proto:
1073         proto_unregister(&udplitev6_prot);
1074 out_unregister_udp_proto:
1075         proto_unregister(&udpv6_prot);
1076 out_unregister_tcp_proto:
1077         proto_unregister(&tcpv6_prot);
1078         goto out;
1079 }
1080 module_init(inet6_init);
1081
1082 static void __exit inet6_exit(void)
1083 {
1084         /* First of all disallow new sockets creation. */
1085         sock_unregister(PF_INET6);
1086         /* Disallow any further netlink messages */
1087         rtnl_unregister_all(PF_INET6);
1088
1089 #ifdef CONFIG_SYSCTL
1090         ipv6_sysctl_unregister();
1091 #endif
1092         udpv6_exit();
1093         udplitev6_exit();
1094         tcpv6_exit();
1095
1096         /* Cleanup code parts. */
1097         ipv6_packet_cleanup();
1098         ipv6_frag_exit();
1099         ipv6_exthdrs_exit();
1100         addrconf_cleanup();
1101         ip6_flowlabel_cleanup();
1102         ip6_route_cleanup();
1103 #ifdef CONFIG_PROC_FS
1104
1105         /* Cleanup code parts. */
1106         if6_proc_exit();
1107         ipv6_misc_proc_exit();
1108         udplite6_proc_exit();
1109         raw6_proc_exit();
1110 #endif
1111         ipv6_netfilter_fini();
1112         igmp6_cleanup();
1113         ndisc_cleanup();
1114         ip6_mr_cleanup();
1115         icmpv6_cleanup();
1116         rawv6_exit();
1117
1118         unregister_pernet_subsys(&inet6_net_ops);
1119         cleanup_ipv6_mibs();
1120         proto_unregister(&rawv6_prot);
1121         proto_unregister(&udplitev6_prot);
1122         proto_unregister(&udpv6_prot);
1123         proto_unregister(&tcpv6_prot);
1124 }
1125 module_exit(inet6_exit);
1126
1127 MODULE_ALIAS_NETPROTO(PF_INET6);