net/ipv6/af_inet6.c

   1 /*
   2  *      PF_INET6 socket protocol family
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *
   8  *      Adapted from linux/net/ipv4/af_inet.c
   9  *
  10  *      $Id: af_inet6.c,v 1.66 2002/02/01 22:01:04 davem Exp $
  11  *
  12  *      Fixes:
  13  *      piggy, Karl Knutson     :       Socket protocol table
  14  *      Hideaki YOSHIFUJI       :       sin6_scope_id support
  15  *      Arnaldo Melo            :       check proc_net_create return, cleanups
  16  *
  17  *      This program is free software; you can redistribute it and/or
  18  *      modify it under the terms of the GNU General Public License
  19  *      as published by the Free Software Foundation; either version
  20  *      2 of the License, or (at your option) any later version.
  21  */
  22
  23
  24 #include <linux/module.h>
  25 #include <linux/capability.h>
  26 #include <linux/errno.h>
  27 #include <linux/types.h>
  28 #include <linux/socket.h>
  29 #include <linux/in.h>
  30 #include <linux/kernel.h>
  31 #include <linux/timer.h>
  32 #include <linux/string.h>
  33 #include <linux/sockios.h>
  34 #include <linux/net.h>
  35 #include <linux/fcntl.h>
  36 #include <linux/mm.h>
  37 #include <linux/interrupt.h>
  38 #include <linux/proc_fs.h>
  39 #include <linux/stat.h>
  40 #include <linux/init.h>
  41
  42 #include <linux/inet.h>
  43 #include <linux/netdevice.h>
  44 #include <linux/icmpv6.h>
  45 #include <linux/netfilter_ipv6.h>
  46
  47 #include <net/ip.h>
  48 #include <net/ipv6.h>
  49 #include <net/udp.h>
  50 #include <net/udplite.h>
  51 #include <net/tcp.h>
  52 #include <net/ipip.h>
  53 #include <net/protocol.h>
  54 #include <net/inet_common.h>
  55 #include <net/transp_v6.h>
  56 #include <net/ip6_route.h>
  57 #include <net/addrconf.h>
  58 #ifdef CONFIG_IPV6_TUNNEL
  59 #include <net/ip6_tunnel.h>
  60 #endif
  61
  62 #include <asm/uaccess.h>
  63 #include <asm/system.h>
  64
  65 MODULE_AUTHOR("Cast of dozens");
  66 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
  67 MODULE_LICENSE("GPL");
  68
  69 /* The inetsw6 table contains everything that inet6_create needs to
  70  * build a new socket.
  71  */
  72 static struct list_head inetsw6[SOCK_MAX];
  73 static DEFINE_SPINLOCK(inetsw6_lock);
  74
  75 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
  76 {
  77         const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
  78
  79         return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
  80 }
  81
  82 static int inet6_create(struct net *net, struct socket *sock, int protocol)
  83 {
  84         struct inet_sock *inet;
  85         struct ipv6_pinfo *np;
  86         struct sock *sk;
  87         struct list_head *p;
  88         struct inet_protosw *answer;
  89         struct proto *answer_prot;
  90         unsigned char answer_flags;
  91         char answer_no_check;
  92         int try_loading_module = 0;
  93         int err;
  94
  95         if (sock->type != SOCK_RAW &&
  96             sock->type != SOCK_DGRAM &&
  97             !inet_ehash_secret)
  98                 build_ehash_secret();
  99
 100         /* Look for the requested type/protocol pair. */
 101         answer = NULL;
 102 lookup_protocol:
 103         err = -ESOCKTNOSUPPORT;
 104         rcu_read_lock();
 105         list_for_each_rcu(p, &inetsw6[sock->type]) {
 106                 answer = list_entry(p, struct inet_protosw, list);
 107
 108                 /* Check the non-wild match. */
 109                 if (protocol == answer->protocol) {
 110                         if (protocol != IPPROTO_IP)
 111                                 break;
 112                 } else {
 113                         /* Check for the two wild cases. */
 114                         if (IPPROTO_IP == protocol) {
 115                                 protocol = answer->protocol;
 116                                 break;
 117                         }
 118                         if (IPPROTO_IP == answer->protocol)
 119                                 break;
 120                 }
 121                 err = -EPROTONOSUPPORT;
 122                 answer = NULL;
 123         }
 124
 125         if (!answer) {
 126                 if (try_loading_module < 2) {
 127                         rcu_read_unlock();
 128                         /*
 129                          * Be more specific, e.g. net-pf-10-proto-132-type-1
 130                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
 131                          */
 132                         if (++try_loading_module == 1)
 133                                 request_module("net-pf-%d-proto-%d-type-%d",
 134                                                 PF_INET6, protocol, sock->type);
 135                         /*
 136                          * Fall back to generic, e.g. net-pf-10-proto-132
 137                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
 138                          */
 139                         else
 140                                 request_module("net-pf-%d-proto-%d",
 141                                                 PF_INET6, protocol);
 142                         goto lookup_protocol;
 143                 } else
 144                         goto out_rcu_unlock;
 145         }
 146
 147         err = -EPERM;
 148         if (answer->capability > 0 && !capable(answer->capability))
 149                 goto out_rcu_unlock;
 150
 151         sock->ops = answer->ops;
 152         answer_prot = answer->prot;
 153         answer_no_check = answer->no_check;
 154         answer_flags = answer->flags;
 155         rcu_read_unlock();
 156
 157         BUG_TRAP(answer_prot->slab != NULL);
 158
 159         err = -ENOBUFS;
 160         sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot);
 161         if (sk == NULL)
 162                 goto out;
 163
 164         sock_init_data(sock, sk);
 165
 166         err = 0;
 167         sk->sk_no_check = answer_no_check;
 168         if (INET_PROTOSW_REUSE & answer_flags)
 169                 sk->sk_reuse = 1;
 170
 171         inet = inet_sk(sk);
 172         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
 173
 174         if (SOCK_RAW == sock->type) {
 175                 inet->num = protocol;
 176                 if (IPPROTO_RAW == protocol)
 177                         inet->hdrincl = 1;
 178         }
 179
 180         sk->sk_destruct         = inet_sock_destruct;
 181         sk->sk_family           = PF_INET6;
 182         sk->sk_protocol         = protocol;
 183
 184         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
 185
 186         inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
 187         np->hop_limit   = -1;
 188         np->mcast_hops  = -1;
 189         np->mc_loop     = 1;
 190         np->pmtudisc    = IPV6_PMTUDISC_WANT;
 191         np->ipv6only    = init_net.ipv6.sysctl.bindv6only;
 192
 193         /* Init the ipv4 part of the socket since we can have sockets
 194          * using v6 API for ipv4.
 195          */
 196         inet->uc_ttl    = -1;
 197
 198         inet->mc_loop   = 1;
 199         inet->mc_ttl    = 1;
 200         inet->mc_index  = 0;
 201         inet->mc_list   = NULL;
 202
 203         if (ipv4_config.no_pmtu_disc)
 204                 inet->pmtudisc = IP_PMTUDISC_DONT;
 205         else
 206                 inet->pmtudisc = IP_PMTUDISC_WANT;
 207         /*
 208          * Increment only the relevant sk_prot->socks debug field, this changes
 209          * the previous behaviour of incrementing both the equivalent to
 210          * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
 211          *
 212          * This allows better debug granularity as we'll know exactly how many
 213          * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
 214          * transport protocol socks. -acme
 215          */
 216         sk_refcnt_debug_inc(sk);
 217
 218         if (inet->num) {
 219                 /* It assumes that any protocol which allows
 220                  * the user to assign a number at socket
 221                  * creation time automatically shares.
 222                  */
 223                 inet->sport = htons(inet->num);
 224                 sk->sk_prot->hash(sk);
 225         }
 226         if (sk->sk_prot->init) {
 227                 err = sk->sk_prot->init(sk);
 228                 if (err) {
 229                         sk_common_release(sk);
 230                         goto out;
 231                 }
 232         }
 233 out:
 234         return err;
 235 out_rcu_unlock:
 236         rcu_read_unlock();
 237         goto out;
 238 }
 239
 240
 241 /* bind for INET6 API */
 242 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 243 {
 244         struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
 245         struct sock *sk = sock->sk;
 246         struct inet_sock *inet = inet_sk(sk);
 247         struct ipv6_pinfo *np = inet6_sk(sk);
 248         struct net *net = sk->sk_net;
 249         __be32 v4addr = 0;
 250         unsigned short snum;
 251         int addr_type = 0;
 252         int err = 0;
 253
 254         /* If the socket has its own bind function then use it. */
 255         if (sk->sk_prot->bind)
 256                 return sk->sk_prot->bind(sk, uaddr, addr_len);
 257
 258         if (addr_len < SIN6_LEN_RFC2133)
 259                 return -EINVAL;
 260         addr_type = ipv6_addr_type(&addr->sin6_addr);
 261         if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
 262                 return -EINVAL;
 263
 264         snum = ntohs(addr->sin6_port);
 265         if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
 266                 return -EACCES;
 267
 268         lock_sock(sk);
 269
 270         /* Check these errors (active socket, double bind). */
 271         if (sk->sk_state != TCP_CLOSE || inet->num) {
 272                 err = -EINVAL;
 273                 goto out;
 274         }
 275
 276         /* Check if the address belongs to the host. */
 277         if (addr_type == IPV6_ADDR_MAPPED) {
 278                 v4addr = addr->sin6_addr.s6_addr32[3];
 279                 if (inet_addr_type(net, v4addr) != RTN_LOCAL) {
 280                         err = -EADDRNOTAVAIL;
 281                         goto out;
 282                 }
 283         } else {
 284                 if (addr_type != IPV6_ADDR_ANY) {
 285                         struct net_device *dev = NULL;
 286
 287                         if (addr_type & IPV6_ADDR_LINKLOCAL) {
 288                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 289                                     addr->sin6_scope_id) {
 290                                         /* Override any existing binding, if another one
 291                                          * is supplied by user.
 292                                          */
 293                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
 294                                 }
 295
 296                                 /* Binding to link-local address requires an interface */
 297                                 if (!sk->sk_bound_dev_if) {
 298                                         err = -EINVAL;
 299                                         goto out;
 300                                 }
 301                                 dev = dev_get_by_index(net, sk->sk_bound_dev_if);
 302                                 if (!dev) {
 303                                         err = -ENODEV;
 304                                         goto out;
 305                                 }
 306                         }
 307
 308                         /* ipv4 addr of the socket is invalid.  Only the
 309                          * unspecified and mapped address have a v4 equivalent.
 310                          */
 311                         v4addr = LOOPBACK4_IPV6;
 312                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
 313                                 if (!ipv6_chk_addr(net, &addr->sin6_addr,
 314                                                    dev, 0)) {
 315                                         if (dev)
 316                                                 dev_put(dev);
 317                                         err = -EADDRNOTAVAIL;
 318                                         goto out;
 319                                 }
 320                         }
 321                         if (dev)
 322                                 dev_put(dev);
 323                 }
 324         }
 325
 326         inet->rcv_saddr = v4addr;
 327         inet->saddr = v4addr;
 328
 329         ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
 330
 331         if (!(addr_type & IPV6_ADDR_MULTICAST))
 332                 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
 333
 334         /* Make sure we are allowed to bind here. */
 335         if (sk->sk_prot->get_port(sk, snum)) {
 336                 inet_reset_saddr(sk);
 337                 err = -EADDRINUSE;
 338                 goto out;
 339         }
 340
 341         if (addr_type != IPV6_ADDR_ANY)
 342                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
 343         if (snum)
 344                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
 345         inet->sport = htons(inet->num);
 346         inet->dport = 0;
 347         inet->daddr = 0;
 348 out:
 349         release_sock(sk);
 350         return err;
 351 }
 352
 353 EXPORT_SYMBOL(inet6_bind);
 354
 355 int inet6_release(struct socket *sock)
 356 {
 357         struct sock *sk = sock->sk;
 358
 359         if (sk == NULL)
 360                 return -EINVAL;
 361
 362         /* Free mc lists */
 363         ipv6_sock_mc_close(sk);
 364
 365         /* Free ac lists */
 366         ipv6_sock_ac_close(sk);
 367
 368         return inet_release(sock);
 369 }
 370
 371 EXPORT_SYMBOL(inet6_release);
 372
 373 int inet6_destroy_sock(struct sock *sk)
 374 {
 375         struct ipv6_pinfo *np = inet6_sk(sk);
 376         struct sk_buff *skb;
 377         struct ipv6_txoptions *opt;
 378
 379         /* Release rx options */
 380
 381         if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
 382                 kfree_skb(skb);
 383
 384         /* Free flowlabels */
 385         fl6_free_socklist(sk);
 386
 387         /* Free tx options */
 388
 389         if ((opt = xchg(&np->opt, NULL)) != NULL)
 390                 sock_kfree_s(sk, opt, opt->tot_len);
 391
 392         return 0;
 393 }
 394
 395 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
 396
 397 /*
 398  *      This does both peername and sockname.
 399  */
 400
 401 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 402                  int *uaddr_len, int peer)
 403 {
 404         struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
 405         struct sock *sk = sock->sk;
 406         struct inet_sock *inet = inet_sk(sk);
 407         struct ipv6_pinfo *np = inet6_sk(sk);
 408
 409         sin->sin6_family = AF_INET6;
 410         sin->sin6_flowinfo = 0;
 411         sin->sin6_scope_id = 0;
 412         if (peer) {
 413                 if (!inet->dport)
 414                         return -ENOTCONN;
 415                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
 416                     peer == 1)
 417                         return -ENOTCONN;
 418                 sin->sin6_port = inet->dport;
 419                 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
 420                 if (np->sndflow)
 421                         sin->sin6_flowinfo = np->flow_label;
 422         } else {
 423                 if (ipv6_addr_any(&np->rcv_saddr))
 424                         ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
 425                 else
 426                         ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
 427
 428                 sin->sin6_port = inet->sport;
 429         }
 430         if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
 431                 sin->sin6_scope_id = sk->sk_bound_dev_if;
 432         *uaddr_len = sizeof(*sin);
 433         return(0);
 434 }
 435
 436 EXPORT_SYMBOL(inet6_getname);
 437
 438 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 439 {
 440         struct sock *sk = sock->sk;
 441         struct net *net = sk->sk_net;
 442
 443         switch(cmd)
 444         {
 445         case SIOCGSTAMP:
 446                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
 447
 448         case SIOCGSTAMPNS:
 449                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
 450
 451         case SIOCADDRT:
 452         case SIOCDELRT:
 453
 454                 return(ipv6_route_ioctl(net, cmd, (void __user *)arg));
 455
 456         case SIOCSIFADDR:
 457                 return addrconf_add_ifaddr(net, (void __user *) arg);
 458         case SIOCDIFADDR:
 459                 return addrconf_del_ifaddr(net, (void __user *) arg);
 460         case SIOCSIFDSTADDR:
 461                 return addrconf_set_dstaddr(net, (void __user *) arg);
 462         default:
 463                 if (!sk->sk_prot->ioctl)
 464                         return -ENOIOCTLCMD;
 465                 return sk->sk_prot->ioctl(sk, cmd, arg);
 466         }
 467         /*NOTREACHED*/
 468         return(0);
 469 }
 470
 471 EXPORT_SYMBOL(inet6_ioctl);
 472
 473 const struct proto_ops inet6_stream_ops = {
 474         .family            = PF_INET6,
 475         .owner             = THIS_MODULE,
 476         .release           = inet6_release,
 477         .bind              = inet6_bind,
 478         .connect           = inet_stream_connect,       /* ok           */
 479         .socketpair        = sock_no_socketpair,        /* a do nothing */
 480         .accept            = inet_accept,               /* ok           */
 481         .getname           = inet6_getname,
 482         .poll              = tcp_poll,                  /* ok           */
 483         .ioctl             = inet6_ioctl,               /* must change  */
 484         .listen            = inet_listen,               /* ok           */
 485         .shutdown          = inet_shutdown,             /* ok           */
 486         .setsockopt        = sock_common_setsockopt,    /* ok           */
 487         .getsockopt        = sock_common_getsockopt,    /* ok           */
 488         .sendmsg           = tcp_sendmsg,               /* ok           */
 489         .recvmsg           = sock_common_recvmsg,       /* ok           */
 490         .mmap              = sock_no_mmap,
 491         .sendpage          = tcp_sendpage,
 492         .splice_read       = tcp_splice_read,
 493 #ifdef CONFIG_COMPAT
 494         .compat_setsockopt = compat_sock_common_setsockopt,
 495         .compat_getsockopt = compat_sock_common_getsockopt,
 496 #endif
 497 };
 498
 499 const struct proto_ops inet6_dgram_ops = {
 500         .family            = PF_INET6,
 501         .owner             = THIS_MODULE,
 502         .release           = inet6_release,
 503         .bind              = inet6_bind,
 504         .connect           = inet_dgram_connect,        /* ok           */
 505         .socketpair        = sock_no_socketpair,        /* a do nothing */
 506         .accept            = sock_no_accept,            /* a do nothing */
 507         .getname           = inet6_getname,
 508         .poll              = udp_poll,                  /* ok           */
 509         .ioctl             = inet6_ioctl,               /* must change  */
 510         .listen            = sock_no_listen,            /* ok           */
 511         .shutdown          = inet_shutdown,             /* ok           */
 512         .setsockopt        = sock_common_setsockopt,    /* ok           */
 513         .getsockopt        = sock_common_getsockopt,    /* ok           */
 514         .sendmsg           = inet_sendmsg,              /* ok           */
 515         .recvmsg           = sock_common_recvmsg,       /* ok           */
 516         .mmap              = sock_no_mmap,
 517         .sendpage          = sock_no_sendpage,
 518 #ifdef CONFIG_COMPAT
 519         .compat_setsockopt = compat_sock_common_setsockopt,
 520         .compat_getsockopt = compat_sock_common_getsockopt,
 521 #endif
 522 };
 523
 524 static struct net_proto_family inet6_family_ops = {
 525         .family = PF_INET6,
 526         .create = inet6_create,
 527         .owner  = THIS_MODULE,
 528 };
 529
 530 int inet6_register_protosw(struct inet_protosw *p)
 531 {
 532         struct list_head *lh;
 533         struct inet_protosw *answer;
 534         struct list_head *last_perm;
 535         int protocol = p->protocol;
 536         int ret;
 537
 538         spin_lock_bh(&inetsw6_lock);
 539
 540         ret = -EINVAL;
 541         if (p->type >= SOCK_MAX)
 542                 goto out_illegal;
 543
 544         /* If we are trying to override a permanent protocol, bail. */
 545         answer = NULL;
 546         ret = -EPERM;
 547         last_perm = &inetsw6[p->type];
 548         list_for_each(lh, &inetsw6[p->type]) {
 549                 answer = list_entry(lh, struct inet_protosw, list);
 550
 551                 /* Check only the non-wild match. */
 552                 if (INET_PROTOSW_PERMANENT & answer->flags) {
 553                         if (protocol == answer->protocol)
 554                                 break;
 555                         last_perm = lh;
 556                 }
 557
 558                 answer = NULL;
 559         }
 560         if (answer)
 561                 goto out_permanent;
 562
 563         /* Add the new entry after the last permanent entry if any, so that
 564          * the new entry does not override a permanent entry when matched with
 565          * a wild-card protocol. But it is allowed to override any existing
 566          * non-permanent entry.  This means that when we remove this entry, the
 567          * system automatically returns to the old behavior.
 568          */
 569         list_add_rcu(&p->list, last_perm);
 570         ret = 0;
 571 out:
 572         spin_unlock_bh(&inetsw6_lock);
 573         return ret;
 574
 575 out_permanent:
 576         printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
 577                protocol);
 578         goto out;
 579
 580 out_illegal:
 581         printk(KERN_ERR
 582                "Ignoring attempt to register invalid socket type %d.\n",
 583                p->type);
 584         goto out;
 585 }
 586
 587 EXPORT_SYMBOL(inet6_register_protosw);
 588
 589 void
 590 inet6_unregister_protosw(struct inet_protosw *p)
 591 {
 592         if (INET_PROTOSW_PERMANENT & p->flags) {
 593                 printk(KERN_ERR
 594                        "Attempt to unregister permanent protocol %d.\n",
 595                        p->protocol);
 596         } else {
 597                 spin_lock_bh(&inetsw6_lock);
 598                 list_del_rcu(&p->list);
 599                 spin_unlock_bh(&inetsw6_lock);
 600
 601                 synchronize_net();
 602         }
 603 }
 604
 605 EXPORT_SYMBOL(inet6_unregister_protosw);
 606
 607 int inet6_sk_rebuild_header(struct sock *sk)
 608 {
 609         int err;
 610         struct dst_entry *dst;
 611         struct ipv6_pinfo *np = inet6_sk(sk);
 612
 613         dst = __sk_dst_check(sk, np->dst_cookie);
 614
 615         if (dst == NULL) {
 616                 struct inet_sock *inet = inet_sk(sk);
 617                 struct in6_addr *final_p = NULL, final;
 618                 struct flowi fl;
 619
 620                 memset(&fl, 0, sizeof(fl));
 621                 fl.proto = sk->sk_protocol;
 622                 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 623                 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
 624                 fl.fl6_flowlabel = np->flow_label;
 625                 fl.oif = sk->sk_bound_dev_if;
 626                 fl.fl_ip_dport = inet->dport;
 627                 fl.fl_ip_sport = inet->sport;
 628                 security_sk_classify_flow(sk, &fl);
 629
 630                 if (np->opt && np->opt->srcrt) {
 631                         struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
 632                         ipv6_addr_copy(&final, &fl.fl6_dst);
 633                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 634                         final_p = &final;
 635                 }
 636
 637                 err = ip6_dst_lookup(sk, &dst, &fl);
 638                 if (err) {
 639                         sk->sk_route_caps = 0;
 640                         return err;
 641                 }
 642                 if (final_p)
 643                         ipv6_addr_copy(&fl.fl6_dst, final_p);
 644
 645                 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
 646                         sk->sk_err_soft = -err;
 647                         return err;
 648                 }
 649
 650                 __ip6_dst_store(sk, dst, NULL, NULL);
 651         }
 652
 653         return 0;
 654 }
 655
 656 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
 657
 658 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
 659 {
 660         struct ipv6_pinfo *np = inet6_sk(sk);
 661         struct inet6_skb_parm *opt = IP6CB(skb);
 662
 663         if (np->rxopt.all) {
 664                 if ((opt->hop && (np->rxopt.bits.hopopts ||
 665                                   np->rxopt.bits.ohopopts)) ||
 666                     ((IPV6_FLOWINFO_MASK &
 667                       *(__be32 *)skb_network_header(skb)) &&
 668                      np->rxopt.bits.rxflow) ||
 669                     (opt->srcrt && (np->rxopt.bits.srcrt ||
 670                      np->rxopt.bits.osrcrt)) ||
 671                     ((opt->dst1 || opt->dst0) &&
 672                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
 673                         return 1;
 674         }
 675         return 0;
 676 }
 677
 678 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
 679
 680 static struct inet6_protocol *ipv6_gso_pull_exthdrs(struct sk_buff *skb,
 681                                                     int proto)
 682 {
 683         struct inet6_protocol *ops = NULL;
 684
 685         for (;;) {
 686                 struct ipv6_opt_hdr *opth;
 687                 int len;
 688
 689                 if (proto != NEXTHDR_HOP) {
 690                         ops = rcu_dereference(inet6_protos[proto]);
 691
 692                         if (unlikely(!ops))
 693                                 break;
 694
 695                         if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
 696                                 break;
 697                 }
 698
 699                 if (unlikely(!pskb_may_pull(skb, 8)))
 700                         break;
 701
 702                 opth = (void *)skb->data;
 703                 len = ipv6_optlen(opth);
 704
 705                 if (unlikely(!pskb_may_pull(skb, len)))
 706                         break;
 707
 708                 proto = opth->nexthdr;
 709                 __skb_pull(skb, len);
 710         }
 711
 712         return ops;
 713 }
 714
 715 static int ipv6_gso_send_check(struct sk_buff *skb)
 716 {
 717         struct ipv6hdr *ipv6h;
 718         struct inet6_protocol *ops;
 719         int err = -EINVAL;
 720
 721         if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
 722                 goto out;
 723
 724         ipv6h = ipv6_hdr(skb);
 725         __skb_pull(skb, sizeof(*ipv6h));
 726         err = -EPROTONOSUPPORT;
 727
 728         rcu_read_lock();
 729         ops = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
 730         if (likely(ops && ops->gso_send_check)) {
 731                 skb_reset_transport_header(skb);
 732                 err = ops->gso_send_check(skb);
 733         }
 734         rcu_read_unlock();
 735
 736 out:
 737         return err;
 738 }
 739
 740 static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features)
 741 {
 742         struct sk_buff *segs = ERR_PTR(-EINVAL);
 743         struct ipv6hdr *ipv6h;
 744         struct inet6_protocol *ops;
 745
 746         if (!(features & NETIF_F_V6_CSUM))
 747                 features &= ~NETIF_F_SG;
 748
 749         if (unlikely(skb_shinfo(skb)->gso_type &
 750                      ~(SKB_GSO_UDP |
 751                        SKB_GSO_DODGY |
 752                        SKB_GSO_TCP_ECN |
 753                        SKB_GSO_TCPV6 |
 754                        0)))
 755                 goto out;
 756
 757         if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
 758                 goto out;
 759
 760         ipv6h = ipv6_hdr(skb);
 761         __skb_pull(skb, sizeof(*ipv6h));
 762         segs = ERR_PTR(-EPROTONOSUPPORT);
 763
 764         rcu_read_lock();
 765         ops = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
 766         if (likely(ops && ops->gso_segment)) {
 767                 skb_reset_transport_header(skb);
 768                 segs = ops->gso_segment(skb, features);
 769         }
 770         rcu_read_unlock();
 771
 772         if (unlikely(IS_ERR(segs)))
 773                 goto out;
 774
 775         for (skb = segs; skb; skb = skb->next) {
 776                 ipv6h = ipv6_hdr(skb);
 777                 ipv6h->payload_len = htons(skb->len - skb->mac_len -
 778                                            sizeof(*ipv6h));
 779         }
 780
 781 out:
 782         return segs;
 783 }
 784
 785 static struct packet_type ipv6_packet_type = {
 786         .type = __constant_htons(ETH_P_IPV6),
 787         .func = ipv6_rcv,
 788         .gso_send_check = ipv6_gso_send_check,
 789         .gso_segment = ipv6_gso_segment,
 790 };
 791
 792 static int __init ipv6_packet_init(void)
 793 {
 794         dev_add_pack(&ipv6_packet_type);
 795         return 0;
 796 }
 797
 798 static void ipv6_packet_cleanup(void)
 799 {
 800         dev_remove_pack(&ipv6_packet_type);
 801 }
 802
 803 static int __init init_ipv6_mibs(void)
 804 {
 805         if (snmp_mib_init((void **)ipv6_statistics,
 806                           sizeof(struct ipstats_mib)) < 0)
 807                 goto err_ip_mib;
 808         if (snmp_mib_init((void **)icmpv6_statistics,
 809                           sizeof(struct icmpv6_mib)) < 0)
 810                 goto err_icmp_mib;
 811         if (snmp_mib_init((void **)icmpv6msg_statistics,
 812                           sizeof(struct icmpv6msg_mib)) < 0)
 813                 goto err_icmpmsg_mib;
 814         if (snmp_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib)) < 0)
 815                 goto err_udp_mib;
 816 #ifdef CONFIG_IP_UDPLITE
 817         if (snmp_mib_init((void **)udplite_stats_in6,
 818                           sizeof (struct udp_mib)) < 0)
 819                 goto err_udplite_mib;
 820 #endif
 821         return 0;
 822
 823 #ifdef CONFIG_IP_UDPLITE
 824 err_udplite_mib:
 825 #endif
 826         snmp_mib_free((void **)udp_stats_in6);
 827 err_udp_mib:
 828         snmp_mib_free((void **)icmpv6msg_statistics);
 829 err_icmpmsg_mib:
 830         snmp_mib_free((void **)icmpv6_statistics);
 831 err_icmp_mib:
 832         snmp_mib_free((void **)ipv6_statistics);
 833 err_ip_mib:
 834         return -ENOMEM;
 835
 836 }
 837
 838 static void cleanup_ipv6_mibs(void)
 839 {
 840         snmp_mib_free((void **)ipv6_statistics);
 841         snmp_mib_free((void **)icmpv6_statistics);
 842         snmp_mib_free((void **)icmpv6msg_statistics);
 843         snmp_mib_free((void **)udp_stats_in6);
 844 #ifdef CONFIG_IP_UDPLITE
 845         snmp_mib_free((void **)udplite_stats_in6);
 846 #endif
 847 }
 848
 849 static int inet6_net_init(struct net *net)
 850 {
 851         net->ipv6.sysctl.bindv6only = 0;
 852         net->ipv6.sysctl.flush_delay = 0;
 853         net->ipv6.sysctl.ip6_rt_max_size = 4096;
 854         net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
 855         net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
 856         net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
 857         net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
 858         net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
 859         net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
 860         net->ipv6.sysctl.icmpv6_time = 1*HZ;
 861
 862         return 0;
 863 }
 864
 865 static void inet6_net_exit(struct net *net)
 866 {
 867         return;
 868 }
 869
 870 static struct pernet_operations inet6_net_ops = {
 871         .init = inet6_net_init,
 872         .exit = inet6_net_exit,
 873 };
 874
 875 static int __init inet6_init(void)
 876 {
 877         struct sk_buff *dummy_skb;
 878         struct list_head *r;
 879         int err;
 880
 881         BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
 882
 883         err = proto_register(&tcpv6_prot, 1);
 884         if (err)
 885                 goto out;
 886
 887         err = proto_register(&udpv6_prot, 1);
 888         if (err)
 889                 goto out_unregister_tcp_proto;
 890
 891 #ifdef CONFIG_IP_UDPLITE
 892         err = proto_register(&udplitev6_prot, 1);
 893         if (err)
 894                 goto out_unregister_udp_proto;
 895 #endif
 896
 897         err = proto_register(&rawv6_prot, 1);
 898         if (err)
 899                 goto out_unregister_udplite_proto;
 900
 901
 902         /* Register the socket-side information for inet6_create.  */
 903         for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
 904                 INIT_LIST_HEAD(r);
 905
 906         /* We MUST register RAW sockets before we create the ICMP6,
 907          * IGMP6, or NDISC control sockets.
 908          */
 909         err = rawv6_init();
 910         if (err)
 911                 goto out_unregister_raw_proto;
 912
 913         /* Register the family here so that the init calls below will
 914          * be able to create sockets. (?? is this dangerous ??)
 915          */
 916         err = sock_register(&inet6_family_ops);
 917         if (err)
 918                 goto out_sock_register_fail;
 919
 920         /* Initialise ipv6 mibs */
 921         err = init_ipv6_mibs();
 922         if (err)
 923                 goto out_unregister_sock;
 924
 925         /*
 926          *      ipngwg API draft makes clear that the correct semantics
 927          *      for TCP and UDP is to consider one TCP and UDP instance
 928          *      in a host availiable by both INET and INET6 APIs and
 929          *      able to communicate via both network protocols.
 930          */
 931
 932         err = register_pernet_subsys(&inet6_net_ops);
 933         if (err)
 934                 goto register_pernet_fail;
 935         err = icmpv6_init();
 936         if (err)
 937                 goto icmp_fail;
 938         err = ndisc_init();
 939         if (err)
 940                 goto ndisc_fail;
 941         err = igmp6_init();
 942         if (err)
 943                 goto igmp_fail;
 944         err = ipv6_netfilter_init();
 945         if (err)
 946                 goto netfilter_fail;
 947         /* Create /proc/foo6 entries. */
 948 #ifdef CONFIG_PROC_FS
 949         err = -ENOMEM;
 950         if (raw6_proc_init())
 951                 goto proc_raw6_fail;
 952         if (tcp6_proc_init())
 953                 goto proc_tcp6_fail;
 954         if (udp6_proc_init())
 955                 goto proc_udp6_fail;
 956         if (udplite6_proc_init())
 957                 goto proc_udplite6_fail;
 958         if (ipv6_misc_proc_init())
 959                 goto proc_misc6_fail;
 960
 961         if (ac6_proc_init())
 962                 goto proc_anycast6_fail;
 963         if (if6_proc_init())
 964                 goto proc_if6_fail;
 965 #endif
 966         err = ip6_route_init();
 967         if (err)
 968                 goto ip6_route_fail;
 969         err = ip6_flowlabel_init();
 970         if (err)
 971                 goto ip6_flowlabel_fail;
 972         err = addrconf_init();
 973         if (err)
 974                 goto addrconf_fail;
 975
 976         /* Init v6 extension headers. */
 977         err = ipv6_exthdrs_init();
 978         if (err)
 979                 goto ipv6_exthdrs_fail;
 980
 981         err = ipv6_frag_init();
 982         if (err)
 983                 goto ipv6_frag_fail;
 984
 985         /* Init v6 transport protocols. */
 986         err = udpv6_init();
 987         if (err)
 988                 goto udpv6_fail;
 989
 990         err = udplitev6_init();
 991         if (err)
 992                 goto udplitev6_fail;
 993
 994         err = tcpv6_init();
 995         if (err)
 996                 goto tcpv6_fail;
 997
 998         err = ipv6_packet_init();
 999         if (err)
1000                 goto ipv6_packet_fail;
1001
1002 #ifdef CONFIG_SYSCTL
1003         err = ipv6_sysctl_register();
1004         if (err)
1005                 goto sysctl_fail;
1006 #endif
1007 out:
1008         return err;
1009
1010 #ifdef CONFIG_SYSCTL
1011 sysctl_fail:
1012         ipv6_packet_cleanup();
1013 #endif
1014 ipv6_packet_fail:
1015         tcpv6_exit();
1016 tcpv6_fail:
1017         udplitev6_exit();
1018 udplitev6_fail:
1019         udpv6_exit();
1020 udpv6_fail:
1021         ipv6_frag_exit();
1022 ipv6_frag_fail:
1023         ipv6_exthdrs_exit();
1024 ipv6_exthdrs_fail:
1025         addrconf_cleanup();
1026 addrconf_fail:
1027         ip6_flowlabel_cleanup();
1028 ip6_flowlabel_fail:
1029         ip6_route_cleanup();
1030 ip6_route_fail:
1031 #ifdef CONFIG_PROC_FS
1032         if6_proc_exit();
1033 proc_if6_fail:
1034         ac6_proc_exit();
1035 proc_anycast6_fail:
1036         ipv6_misc_proc_exit();
1037 proc_misc6_fail:
1038         udplite6_proc_exit();
1039 proc_udplite6_fail:
1040         udp6_proc_exit();
1041 proc_udp6_fail:
1042         tcp6_proc_exit();
1043 proc_tcp6_fail:
1044         raw6_proc_exit();
1045 proc_raw6_fail:
1046 #endif
1047         ipv6_netfilter_fini();
1048 netfilter_fail:
1049         igmp6_cleanup();
1050 igmp_fail:
1051         ndisc_cleanup();
1052 ndisc_fail:
1053         icmpv6_cleanup();
1054 icmp_fail:
1055         unregister_pernet_subsys(&inet6_net_ops);
1056 register_pernet_fail:
1057         cleanup_ipv6_mibs();
1058 out_unregister_sock:
1059         sock_unregister(PF_INET6);
1060         rtnl_unregister_all(PF_INET6);
1061 out_sock_register_fail:
1062         rawv6_exit();
1063 out_unregister_raw_proto:
1064         proto_unregister(&rawv6_prot);
1065 out_unregister_udplite_proto:
1066 #ifdef CONFIG_IP_UDPLITE
1067         proto_unregister(&udplitev6_prot);
1068 out_unregister_udp_proto:
1069 #endif
1070         proto_unregister(&udpv6_prot);
1071 out_unregister_tcp_proto:
1072         proto_unregister(&tcpv6_prot);
1073         goto out;
1074 }
1075 module_init(inet6_init);
1076
1077 static void __exit inet6_exit(void)
1078 {
1079         /* First of all disallow new sockets creation. */
1080         sock_unregister(PF_INET6);
1081         /* Disallow any further netlink messages */
1082         rtnl_unregister_all(PF_INET6);
1083
1084 #ifdef CONFIG_SYSCTL
1085         ipv6_sysctl_unregister();
1086 #endif
1087         udpv6_exit();
1088 #ifdef CONFIG_IP_UDPLITE
1089         udplitev6_exit();
1090 #endif
1091         tcpv6_exit();
1092
1093         /* Cleanup code parts. */
1094         ipv6_packet_cleanup();
1095         ipv6_frag_exit();
1096         ipv6_exthdrs_exit();
1097         addrconf_cleanup();
1098         ip6_flowlabel_cleanup();
1099         ip6_route_cleanup();
1100 #ifdef CONFIG_PROC_FS
1101
1102         /* Cleanup code parts. */
1103         if6_proc_exit();
1104         ac6_proc_exit();
1105         ipv6_misc_proc_exit();
1106         udplite6_proc_exit();
1107         udp6_proc_exit();
1108         tcp6_proc_exit();
1109         raw6_proc_exit();
1110 #endif
1111         ipv6_netfilter_fini();
1112         igmp6_cleanup();
1113         ndisc_cleanup();
1114         icmpv6_cleanup();
1115         rawv6_exit();
1116
1117         unregister_pernet_subsys(&inet6_net_ops);
1118         cleanup_ipv6_mibs();
1119         proto_unregister(&rawv6_prot);
1120 #ifdef CONFIG_IP_UDPLITE
1121         proto_unregister(&udplitev6_prot);
1122 #endif
1123         proto_unregister(&udpv6_prot);
1124         proto_unregister(&tcpv6_prot);
1125 }
1126 module_exit(inet6_exit);
1127
1128 MODULE_ALIAS_NETPROTO(PF_INET6);