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/route.h>
  54 #include <net/transp_v6.h>
  55 #include <net/ip6_route.h>
  56 #include <net/addrconf.h>
  57 #ifdef CONFIG_IPV6_TUNNEL
  58 #include <net/ip6_tunnel.h>
  59 #endif
  60
  61 #include <asm/uaccess.h>
  62 #include <asm/system.h>
  63 #include <linux/mroute6.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 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 lookup_protocol:
 101         err = -ESOCKTNOSUPPORT;
 102         rcu_read_lock();
 103         list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
 104
 105                 err = 0;
 106                 /* Check the non-wild match. */
 107                 if (protocol == answer->protocol) {
 108                         if (protocol != IPPROTO_IP)
 109                                 break;
 110                 } else {
 111                         /* Check for the two wild cases. */
 112                         if (IPPROTO_IP == protocol) {
 113                                 protocol = answer->protocol;
 114                                 break;
 115                         }
 116                         if (IPPROTO_IP == answer->protocol)
 117                                 break;
 118                 }
 119                 err = -EPROTONOSUPPORT;
 120         }
 121
 122         if (err) {
 123                 if (try_loading_module < 2) {
 124                         rcu_read_unlock();
 125                         /*
 126                          * Be more specific, e.g. net-pf-10-proto-132-type-1
 127                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
 128                          */
 129                         if (++try_loading_module == 1)
 130                                 request_module("net-pf-%d-proto-%d-type-%d",
 131                                                 PF_INET6, protocol, sock->type);
 132                         /*
 133                          * Fall back to generic, e.g. net-pf-10-proto-132
 134                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
 135                          */
 136                         else
 137                                 request_module("net-pf-%d-proto-%d",
 138                                                 PF_INET6, protocol);
 139                         goto lookup_protocol;
 140                 } else
 141                         goto out_rcu_unlock;
 142         }
 143
 144         err = -EPERM;
 145         if (answer->capability > 0 && !capable(answer->capability))
 146                 goto out_rcu_unlock;
 147
 148         sock->ops = answer->ops;
 149         answer_prot = answer->prot;
 150         answer_no_check = answer->no_check;
 151         answer_flags = answer->flags;
 152         rcu_read_unlock();
 153
 154         WARN_ON(answer_prot->slab == NULL);
 155
 156         err = -ENOBUFS;
 157         sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot);
 158         if (sk == NULL)
 159                 goto out;
 160
 161         sock_init_data(sock, sk);
 162
 163         err = 0;
 164         sk->sk_no_check = answer_no_check;
 165         if (INET_PROTOSW_REUSE & answer_flags)
 166                 sk->sk_reuse = 1;
 167
 168         inet = inet_sk(sk);
 169         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
 170
 171         if (SOCK_RAW == sock->type) {
 172                 inet->num = protocol;
 173                 if (IPPROTO_RAW == protocol)
 174                         inet->hdrincl = 1;
 175         }
 176
 177         sk->sk_destruct         = inet_sock_destruct;
 178         sk->sk_family           = PF_INET6;
 179         sk->sk_protocol         = protocol;
 180
 181         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
 182
 183         inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
 184         np->hop_limit   = -1;
 185         np->mcast_hops  = -1;
 186         np->mc_loop     = 1;
 187         np->pmtudisc    = IPV6_PMTUDISC_WANT;
 188         np->ipv6only    = net->ipv6.sysctl.bindv6only;
 189
 190         /* Init the ipv4 part of the socket since we can have sockets
 191          * using v6 API for ipv4.
 192          */
 193         inet->uc_ttl    = -1;
 194
 195         inet->mc_loop   = 1;
 196         inet->mc_ttl    = 1;
 197         inet->mc_index  = 0;
 198         inet->mc_list   = NULL;
 199
 200         if (ipv4_config.no_pmtu_disc)
 201                 inet->pmtudisc = IP_PMTUDISC_DONT;
 202         else
 203                 inet->pmtudisc = IP_PMTUDISC_WANT;
 204         /*
 205          * Increment only the relevant sk_prot->socks debug field, this changes
 206          * the previous behaviour of incrementing both the equivalent to
 207          * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
 208          *
 209          * This allows better debug granularity as we'll know exactly how many
 210          * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
 211          * transport protocol socks. -acme
 212          */
 213         sk_refcnt_debug_inc(sk);
 214
 215         if (inet->num) {
 216                 /* It assumes that any protocol which allows
 217                  * the user to assign a number at socket
 218                  * creation time automatically shares.
 219                  */
 220                 inet->sport = htons(inet->num);
 221                 sk->sk_prot->hash(sk);
 222         }
 223         if (sk->sk_prot->init) {
 224                 err = sk->sk_prot->init(sk);
 225                 if (err) {
 226                         sk_common_release(sk);
 227                         goto out;
 228                 }
 229         }
 230 out:
 231         return err;
 232 out_rcu_unlock:
 233         rcu_read_unlock();
 234         goto out;
 235 }
 236
 237
 238 /* bind for INET6 API */
 239 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 240 {
 241         struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
 242         struct sock *sk = sock->sk;
 243         struct inet_sock *inet = inet_sk(sk);
 244         struct ipv6_pinfo *np = inet6_sk(sk);
 245         struct net *net = sock_net(sk);
 246         __be32 v4addr = 0;
 247         unsigned short snum;
 248         int addr_type = 0;
 249         int err = 0;
 250
 251         /* If the socket has its own bind function then use it. */
 252         if (sk->sk_prot->bind)
 253                 return sk->sk_prot->bind(sk, uaddr, addr_len);
 254
 255         if (addr_len < SIN6_LEN_RFC2133)
 256                 return -EINVAL;
 257         addr_type = ipv6_addr_type(&addr->sin6_addr);
 258         if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
 259                 return -EINVAL;
 260
 261         snum = ntohs(addr->sin6_port);
 262         if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
 263                 return -EACCES;
 264
 265         lock_sock(sk);
 266
 267         /* Check these errors (active socket, double bind). */
 268         if (sk->sk_state != TCP_CLOSE || inet->num) {
 269                 err = -EINVAL;
 270                 goto out;
 271         }
 272
 273         /* Check if the address belongs to the host. */
 274         if (addr_type == IPV6_ADDR_MAPPED) {
 275                 v4addr = addr->sin6_addr.s6_addr32[3];
 276                 if (inet_addr_type(net, v4addr) != RTN_LOCAL) {
 277                         err = -EADDRNOTAVAIL;
 278                         goto out;
 279                 }
 280         } else {
 281                 if (addr_type != IPV6_ADDR_ANY) {
 282                         struct net_device *dev = NULL;
 283
 284                         if (addr_type & IPV6_ADDR_LINKLOCAL) {
 285                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 286                                     addr->sin6_scope_id) {
 287                                         /* Override any existing binding, if another one
 288                                          * is supplied by user.
 289                                          */
 290                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
 291                                 }
 292
 293                                 /* Binding to link-local address requires an interface */
 294                                 if (!sk->sk_bound_dev_if) {
 295                                         err = -EINVAL;
 296                                         goto out;
 297                                 }
 298                                 dev = dev_get_by_index(net, sk->sk_bound_dev_if);
 299                                 if (!dev) {
 300                                         err = -ENODEV;
 301                                         goto out;
 302                                 }
 303                         }
 304
 305                         /* ipv4 addr of the socket is invalid.  Only the
 306                          * unspecified and mapped address have a v4 equivalent.
 307                          */
 308                         v4addr = LOOPBACK4_IPV6;
 309                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
 310                                 if (!ipv6_chk_addr(net, &addr->sin6_addr,
 311                                                    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 = htons(inet->num);
 343         inet->dport = 0;
 344         inet->daddr = 0;
 345 out:
 346         release_sock(sk);
 347         return err;
 348 }
 349
 350 EXPORT_SYMBOL(inet6_bind);
 351
 352 int inet6_release(struct socket *sock)
 353 {
 354         struct sock *sk = sock->sk;
 355
 356         if (sk == NULL)
 357                 return -EINVAL;
 358
 359         /* Free mc lists */
 360         ipv6_sock_mc_close(sk);
 361
 362         /* Free ac lists */
 363         ipv6_sock_ac_close(sk);
 364
 365         return inet_release(sock);
 366 }
 367
 368 EXPORT_SYMBOL(inet6_release);
 369
 370 void inet6_destroy_sock(struct sock *sk)
 371 {
 372         struct ipv6_pinfo *np = inet6_sk(sk);
 373         struct sk_buff *skb;
 374         struct ipv6_txoptions *opt;
 375
 376         /* Release rx options */
 377
 378         if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
 379                 kfree_skb(skb);
 380
 381         /* Free flowlabels */
 382         fl6_free_socklist(sk);
 383
 384         /* Free tx options */
 385
 386         if ((opt = xchg(&np->opt, NULL)) != NULL)
 387                 sock_kfree_s(sk, opt, opt->tot_len);
 388 }
 389
 390 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
 391
 392 /*
 393  *      This does both peername and sockname.
 394  */
 395
 396 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 397                  int *uaddr_len, int peer)
 398 {
 399         struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
 400         struct sock *sk = sock->sk;
 401         struct inet_sock *inet = inet_sk(sk);
 402         struct ipv6_pinfo *np = inet6_sk(sk);
 403
 404         sin->sin6_family = AF_INET6;
 405         sin->sin6_flowinfo = 0;
 406         sin->sin6_scope_id = 0;
 407         if (peer) {
 408                 if (!inet->dport)
 409                         return -ENOTCONN;
 410                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
 411                     peer == 1)
 412                         return -ENOTCONN;
 413                 sin->sin6_port = inet->dport;
 414                 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
 415                 if (np->sndflow)
 416                         sin->sin6_flowinfo = np->flow_label;
 417         } else {
 418                 if (ipv6_addr_any(&np->rcv_saddr))
 419                         ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
 420                 else
 421                         ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
 422
 423                 sin->sin6_port = inet->sport;
 424         }
 425         if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
 426                 sin->sin6_scope_id = sk->sk_bound_dev_if;
 427         *uaddr_len = sizeof(*sin);
 428         return(0);
 429 }
 430
 431 EXPORT_SYMBOL(inet6_getname);
 432
 433 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 434 {
 435         struct sock *sk = sock->sk;
 436         struct net *net = sock_net(sk);
 437
 438         switch(cmd)
 439         {
 440         case SIOCGSTAMP:
 441                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
 442
 443         case SIOCGSTAMPNS:
 444                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
 445
 446         case SIOCADDRT:
 447         case SIOCDELRT:
 448
 449                 return(ipv6_route_ioctl(net, cmd, (void __user *)arg));
 450
 451         case SIOCSIFADDR:
 452                 return addrconf_add_ifaddr(net, (void __user *) arg);
 453         case SIOCDIFADDR:
 454                 return addrconf_del_ifaddr(net, (void __user *) arg);
 455         case SIOCSIFDSTADDR:
 456                 return addrconf_set_dstaddr(net, (void __user *) arg);
 457         default:
 458                 if (!sk->sk_prot->ioctl)
 459                         return -ENOIOCTLCMD;
 460                 return sk->sk_prot->ioctl(sk, cmd, arg);
 461         }
 462         /*NOTREACHED*/
 463         return(0);
 464 }
 465
 466 EXPORT_SYMBOL(inet6_ioctl);
 467
 468 const struct proto_ops inet6_stream_ops = {
 469         .family            = PF_INET6,
 470         .owner             = THIS_MODULE,
 471         .release           = inet6_release,
 472         .bind              = inet6_bind,
 473         .connect           = inet_stream_connect,       /* ok           */
 474         .socketpair        = sock_no_socketpair,        /* a do nothing */
 475         .accept            = inet_accept,               /* ok           */
 476         .getname           = inet6_getname,
 477         .poll              = tcp_poll,                  /* ok           */
 478         .ioctl             = inet6_ioctl,               /* must change  */
 479         .listen            = inet_listen,               /* ok           */
 480         .shutdown          = inet_shutdown,             /* ok           */
 481         .setsockopt        = sock_common_setsockopt,    /* ok           */
 482         .getsockopt        = sock_common_getsockopt,    /* ok           */
 483         .sendmsg           = tcp_sendmsg,               /* ok           */
 484         .recvmsg           = sock_common_recvmsg,       /* ok           */
 485         .mmap              = sock_no_mmap,
 486         .sendpage          = tcp_sendpage,
 487         .splice_read       = tcp_splice_read,
 488 #ifdef CONFIG_COMPAT
 489         .compat_setsockopt = compat_sock_common_setsockopt,
 490         .compat_getsockopt = compat_sock_common_getsockopt,
 491 #endif
 492 };
 493
 494 const struct proto_ops inet6_dgram_ops = {
 495         .family            = PF_INET6,
 496         .owner             = THIS_MODULE,
 497         .release           = inet6_release,
 498         .bind              = inet6_bind,
 499         .connect           = inet_dgram_connect,        /* ok           */
 500         .socketpair        = sock_no_socketpair,        /* a do nothing */
 501         .accept            = sock_no_accept,            /* a do nothing */
 502         .getname           = inet6_getname,
 503         .poll              = udp_poll,                  /* ok           */
 504         .ioctl             = inet6_ioctl,               /* must change  */
 505         .listen            = sock_no_listen,            /* ok           */
 506         .shutdown          = inet_shutdown,             /* ok           */
 507         .setsockopt        = sock_common_setsockopt,    /* ok           */
 508         .getsockopt        = sock_common_getsockopt,    /* ok           */
 509         .sendmsg           = inet_sendmsg,              /* ok           */
 510         .recvmsg           = sock_common_recvmsg,       /* ok           */
 511         .mmap              = sock_no_mmap,
 512         .sendpage          = sock_no_sendpage,
 513 #ifdef CONFIG_COMPAT
 514         .compat_setsockopt = compat_sock_common_setsockopt,
 515         .compat_getsockopt = compat_sock_common_getsockopt,
 516 #endif
 517 };
 518
 519 static struct net_proto_family inet6_family_ops = {
 520         .family = PF_INET6,
 521         .create = inet6_create,
 522         .owner  = THIS_MODULE,
 523 };
 524
 525 int inet6_register_protosw(struct inet_protosw *p)
 526 {
 527         struct list_head *lh;
 528         struct inet_protosw *answer;
 529         struct list_head *last_perm;
 530         int protocol = p->protocol;
 531         int ret;
 532
 533         spin_lock_bh(&inetsw6_lock);
 534
 535         ret = -EINVAL;
 536         if (p->type >= SOCK_MAX)
 537                 goto out_illegal;
 538
 539         /* If we are trying to override a permanent protocol, bail. */
 540         answer = NULL;
 541         ret = -EPERM;
 542         last_perm = &inetsw6[p->type];
 543         list_for_each(lh, &inetsw6[p->type]) {
 544                 answer = list_entry(lh, struct inet_protosw, list);
 545
 546                 /* Check only the non-wild match. */
 547                 if (INET_PROTOSW_PERMANENT & answer->flags) {
 548                         if (protocol == answer->protocol)
 549                                 break;
 550                         last_perm = lh;
 551                 }
 552
 553                 answer = NULL;
 554         }
 555         if (answer)
 556                 goto out_permanent;
 557
 558         /* Add the new entry after the last permanent entry if any, so that
 559          * the new entry does not override a permanent entry when matched with
 560          * a wild-card protocol. But it is allowed to override any existing
 561          * non-permanent entry.  This means that when we remove this entry, the
 562          * system automatically returns to the old behavior.
 563          */
 564         list_add_rcu(&p->list, last_perm);
 565         ret = 0;
 566 out:
 567         spin_unlock_bh(&inetsw6_lock);
 568         return ret;
 569
 570 out_permanent:
 571         printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
 572                protocol);
 573         goto out;
 574
 575 out_illegal:
 576         printk(KERN_ERR
 577                "Ignoring attempt to register invalid socket type %d.\n",
 578                p->type);
 579         goto out;
 580 }
 581
 582 EXPORT_SYMBOL(inet6_register_protosw);
 583
 584 void
 585 inet6_unregister_protosw(struct inet_protosw *p)
 586 {
 587         if (INET_PROTOSW_PERMANENT & p->flags) {
 588                 printk(KERN_ERR
 589                        "Attempt to unregister permanent protocol %d.\n",
 590                        p->protocol);
 591         } else {
 592                 spin_lock_bh(&inetsw6_lock);
 593                 list_del_rcu(&p->list);
 594                 spin_unlock_bh(&inetsw6_lock);
 595
 596                 synchronize_net();
 597         }
 598 }
 599
 600 EXPORT_SYMBOL(inet6_unregister_protosw);
 601
 602 int inet6_sk_rebuild_header(struct sock *sk)
 603 {
 604         int err;
 605         struct dst_entry *dst;
 606         struct ipv6_pinfo *np = inet6_sk(sk);
 607
 608         dst = __sk_dst_check(sk, np->dst_cookie);
 609
 610         if (dst == NULL) {
 611                 struct inet_sock *inet = inet_sk(sk);
 612                 struct in6_addr *final_p = NULL, final;
 613                 struct flowi fl;
 614
 615                 memset(&fl, 0, sizeof(fl));
 616                 fl.proto = sk->sk_protocol;
 617                 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 618                 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
 619                 fl.fl6_flowlabel = np->flow_label;
 620                 fl.oif = sk->sk_bound_dev_if;
 621                 fl.fl_ip_dport = inet->dport;
 622                 fl.fl_ip_sport = inet->sport;
 623                 security_sk_classify_flow(sk, &fl);
 624
 625                 if (np->opt && np->opt->srcrt) {
 626                         struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
 627                         ipv6_addr_copy(&final, &fl.fl6_dst);
 628                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 629                         final_p = &final;
 630                 }
 631
 632                 err = ip6_dst_lookup(sk, &dst, &fl);
 633                 if (err) {
 634                         sk->sk_route_caps = 0;
 635                         return err;
 636                 }
 637                 if (final_p)
 638                         ipv6_addr_copy(&fl.fl6_dst, final_p);
 639
 640                 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
 641                         sk->sk_err_soft = -err;
 642                         return err;
 643                 }
 644
 645                 __ip6_dst_store(sk, dst, NULL, NULL);
 646         }
 647
 648         return 0;
 649 }
 650
 651 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
 652
 653 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
 654 {
 655         struct ipv6_pinfo *np = inet6_sk(sk);
 656         struct inet6_skb_parm *opt = IP6CB(skb);
 657
 658         if (np->rxopt.all) {
 659                 if ((opt->hop && (np->rxopt.bits.hopopts ||
 660                                   np->rxopt.bits.ohopopts)) ||
 661                     ((IPV6_FLOWINFO_MASK &
 662                       *(__be32 *)skb_network_header(skb)) &&
 663                      np->rxopt.bits.rxflow) ||
 664                     (opt->srcrt && (np->rxopt.bits.srcrt ||
 665                      np->rxopt.bits.osrcrt)) ||
 666                     ((opt->dst1 || opt->dst0) &&
 667                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
 668                         return 1;
 669         }
 670         return 0;
 671 }
 672
 673 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
 674
 675 static struct inet6_protocol *ipv6_gso_pull_exthdrs(struct sk_buff *skb,
 676                                                     int proto)
 677 {
 678         struct inet6_protocol *ops = NULL;
 679
 680         for (;;) {
 681                 struct ipv6_opt_hdr *opth;
 682                 int len;
 683
 684                 if (proto != NEXTHDR_HOP) {
 685                         ops = rcu_dereference(inet6_protos[proto]);
 686
 687                         if (unlikely(!ops))
 688                                 break;
 689
 690                         if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
 691                                 break;
 692                 }
 693
 694                 if (unlikely(!pskb_may_pull(skb, 8)))
 695                         break;
 696
 697                 opth = (void *)skb->data;
 698                 len = ipv6_optlen(opth);
 699
 700                 if (unlikely(!pskb_may_pull(skb, len)))
 701                         break;
 702
 703                 proto = opth->nexthdr;
 704                 __skb_pull(skb, len);
 705         }
 706
 707         return ops;
 708 }
 709
 710 static int ipv6_gso_send_check(struct sk_buff *skb)
 711 {
 712         struct ipv6hdr *ipv6h;
 713         struct inet6_protocol *ops;
 714         int err = -EINVAL;
 715
 716         if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
 717                 goto out;
 718
 719         ipv6h = ipv6_hdr(skb);
 720         __skb_pull(skb, sizeof(*ipv6h));
 721         err = -EPROTONOSUPPORT;
 722
 723         rcu_read_lock();
 724         ops = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
 725         if (likely(ops && ops->gso_send_check)) {
 726                 skb_reset_transport_header(skb);
 727                 err = ops->gso_send_check(skb);
 728         }
 729         rcu_read_unlock();
 730
 731 out:
 732         return err;
 733 }
 734
 735 static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features)
 736 {
 737         struct sk_buff *segs = ERR_PTR(-EINVAL);
 738         struct ipv6hdr *ipv6h;
 739         struct inet6_protocol *ops;
 740
 741         if (!(features & NETIF_F_V6_CSUM))
 742                 features &= ~NETIF_F_SG;
 743
 744         if (unlikely(skb_shinfo(skb)->gso_type &
 745                      ~(SKB_GSO_UDP |
 746                        SKB_GSO_DODGY |
 747                        SKB_GSO_TCP_ECN |
 748                        SKB_GSO_TCPV6 |
 749                        0)))
 750                 goto out;
 751
 752         if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
 753                 goto out;
 754
 755         ipv6h = ipv6_hdr(skb);
 756         __skb_pull(skb, sizeof(*ipv6h));
 757         segs = ERR_PTR(-EPROTONOSUPPORT);
 758
 759         rcu_read_lock();
 760         ops = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
 761         if (likely(ops && ops->gso_segment)) {
 762                 skb_reset_transport_header(skb);
 763                 segs = ops->gso_segment(skb, features);
 764         }
 765         rcu_read_unlock();
 766
 767         if (unlikely(IS_ERR(segs)))
 768                 goto out;
 769
 770         for (skb = segs; skb; skb = skb->next) {
 771                 ipv6h = ipv6_hdr(skb);
 772                 ipv6h->payload_len = htons(skb->len - skb->mac_len -
 773                                            sizeof(*ipv6h));
 774         }
 775
 776 out:
 777         return segs;
 778 }
 779
 780 static struct packet_type ipv6_packet_type = {
 781         .type = __constant_htons(ETH_P_IPV6),
 782         .func = ipv6_rcv,
 783         .gso_send_check = ipv6_gso_send_check,
 784         .gso_segment = ipv6_gso_segment,
 785 };
 786
 787 static int __init ipv6_packet_init(void)
 788 {
 789         dev_add_pack(&ipv6_packet_type);
 790         return 0;
 791 }
 792
 793 static void ipv6_packet_cleanup(void)
 794 {
 795         dev_remove_pack(&ipv6_packet_type);
 796 }
 797
 798 static int __net_init ipv6_init_mibs(struct net *net)
 799 {
 800         if (snmp_mib_init((void **)net->mib.udp_stats_in6,
 801                           sizeof (struct udp_mib)) < 0)
 802                 return -ENOMEM;
 803         if (snmp_mib_init((void **)net->mib.udplite_stats_in6,
 804                           sizeof (struct udp_mib)) < 0)
 805                 goto err_udplite_mib;
 806         if (snmp_mib_init((void **)net->mib.ipv6_statistics,
 807                           sizeof(struct ipstats_mib)) < 0)
 808                 goto err_ip_mib;
 809         if (snmp_mib_init((void **)net->mib.icmpv6_statistics,
 810                           sizeof(struct icmpv6_mib)) < 0)
 811                 goto err_icmp_mib;
 812         if (snmp_mib_init((void **)net->mib.icmpv6msg_statistics,
 813                           sizeof(struct icmpv6msg_mib)) < 0)
 814                 goto err_icmpmsg_mib;
 815         return 0;
 816
 817 err_icmpmsg_mib:
 818         snmp_mib_free((void **)net->mib.icmpv6_statistics);
 819 err_icmp_mib:
 820         snmp_mib_free((void **)net->mib.ipv6_statistics);
 821 err_ip_mib:
 822         snmp_mib_free((void **)net->mib.udplite_stats_in6);
 823 err_udplite_mib:
 824         snmp_mib_free((void **)net->mib.udp_stats_in6);
 825         return -ENOMEM;
 826 }
 827
 828 static void __net_exit ipv6_cleanup_mibs(struct net *net)
 829 {
 830         snmp_mib_free((void **)net->mib.udp_stats_in6);
 831         snmp_mib_free((void **)net->mib.udplite_stats_in6);
 832         snmp_mib_free((void **)net->mib.ipv6_statistics);
 833         snmp_mib_free((void **)net->mib.icmpv6_statistics);
 834         snmp_mib_free((void **)net->mib.icmpv6msg_statistics);
 835 }
 836
 837 static int __net_init inet6_net_init(struct net *net)
 838 {
 839         int err = 0;
 840
 841         net->ipv6.sysctl.bindv6only = 0;
 842         net->ipv6.sysctl.icmpv6_time = 1*HZ;
 843
 844         err = ipv6_init_mibs(net);
 845         if (err)
 846                 return err;
 847 #ifdef CONFIG_PROC_FS
 848         err = udp6_proc_init(net);
 849         if (err)
 850                 goto out;
 851         err = tcp6_proc_init(net);
 852         if (err)
 853                 goto proc_tcp6_fail;
 854         err = ac6_proc_init(net);
 855         if (err)
 856                 goto proc_ac6_fail;
 857 #endif
 858         return err;
 859
 860 #ifdef CONFIG_PROC_FS
 861 proc_ac6_fail:
 862         tcp6_proc_exit(net);
 863 proc_tcp6_fail:
 864         udp6_proc_exit(net);
 865 out:
 866         ipv6_cleanup_mibs(net);
 867         return err;
 868 #endif
 869 }
 870
 871 static void inet6_net_exit(struct net *net)
 872 {
 873 #ifdef CONFIG_PROC_FS
 874         udp6_proc_exit(net);
 875         tcp6_proc_exit(net);
 876         ac6_proc_exit(net);
 877 #endif
 878         ipv6_cleanup_mibs(net);
 879 }
 880
 881 static struct pernet_operations inet6_net_ops = {
 882         .init = inet6_net_init,
 883         .exit = inet6_net_exit,
 884 };
 885
 886 static int __init inet6_init(void)
 887 {
 888         struct sk_buff *dummy_skb;
 889         struct list_head *r;
 890         int err;
 891
 892         BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
 893
 894         err = proto_register(&tcpv6_prot, 1);
 895         if (err)
 896                 goto out;
 897
 898         err = proto_register(&udpv6_prot, 1);
 899         if (err)
 900                 goto out_unregister_tcp_proto;
 901
 902         err = proto_register(&udplitev6_prot, 1);
 903         if (err)
 904                 goto out_unregister_udp_proto;
 905
 906         err = proto_register(&rawv6_prot, 1);
 907         if (err)
 908                 goto out_unregister_udplite_proto;
 909
 910
 911         /* Register the socket-side information for inet6_create.  */
 912         for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
 913                 INIT_LIST_HEAD(r);
 914
 915         /* We MUST register RAW sockets before we create the ICMP6,
 916          * IGMP6, or NDISC control sockets.
 917          */
 918         err = rawv6_init();
 919         if (err)
 920                 goto out_unregister_raw_proto;
 921
 922         /* Register the family here so that the init calls below will
 923          * be able to create sockets. (?? is this dangerous ??)
 924          */
 925         err = sock_register(&inet6_family_ops);
 926         if (err)
 927                 goto out_sock_register_fail;
 928
 929 #ifdef CONFIG_SYSCTL
 930         err = ipv6_static_sysctl_register();
 931         if (err)
 932                 goto static_sysctl_fail;
 933 #endif
 934         /*
 935          *      ipngwg API draft makes clear that the correct semantics
 936          *      for TCP and UDP is to consider one TCP and UDP instance
 937          *      in a host availiable by both INET and INET6 APIs and
 938          *      able to communicate via both network protocols.
 939          */
 940
 941         err = register_pernet_subsys(&inet6_net_ops);
 942         if (err)
 943                 goto register_pernet_fail;
 944         err = icmpv6_init();
 945         if (err)
 946                 goto icmp_fail;
 947         err = ip6_mr_init();
 948         if (err)
 949                 goto ipmr_fail;
 950         err = ndisc_init();
 951         if (err)
 952                 goto ndisc_fail;
 953         err = igmp6_init();
 954         if (err)
 955                 goto igmp_fail;
 956         err = ipv6_netfilter_init();
 957         if (err)
 958                 goto netfilter_fail;
 959         /* Create /proc/foo6 entries. */
 960 #ifdef CONFIG_PROC_FS
 961         err = -ENOMEM;
 962         if (raw6_proc_init())
 963                 goto proc_raw6_fail;
 964         if (udplite6_proc_init())
 965                 goto proc_udplite6_fail;
 966         if (ipv6_misc_proc_init())
 967                 goto proc_misc6_fail;
 968         if (if6_proc_init())
 969                 goto proc_if6_fail;
 970 #endif
 971         err = ip6_route_init();
 972         if (err)
 973                 goto ip6_route_fail;
 974         err = ip6_flowlabel_init();
 975         if (err)
 976                 goto ip6_flowlabel_fail;
 977         err = addrconf_init();
 978         if (err)
 979                 goto addrconf_fail;
 980
 981         /* Init v6 extension headers. */
 982         err = ipv6_exthdrs_init();
 983         if (err)
 984                 goto ipv6_exthdrs_fail;
 985
 986         err = ipv6_frag_init();
 987         if (err)
 988                 goto ipv6_frag_fail;
 989
 990         /* Init v6 transport protocols. */
 991         err = udpv6_init();
 992         if (err)
 993                 goto udpv6_fail;
 994
 995         err = udplitev6_init();
 996         if (err)
 997                 goto udplitev6_fail;
 998
 999         err = tcpv6_init();
1000         if (err)
1001                 goto tcpv6_fail;
1002
1003         err = ipv6_packet_init();
1004         if (err)
1005                 goto ipv6_packet_fail;
1006
1007 #ifdef CONFIG_SYSCTL
1008         err = ipv6_sysctl_register();
1009         if (err)
1010                 goto sysctl_fail;
1011 #endif
1012 out:
1013         return err;
1014
1015 #ifdef CONFIG_SYSCTL
1016 sysctl_fail:
1017         ipv6_packet_cleanup();
1018 #endif
1019 ipv6_packet_fail:
1020         tcpv6_exit();
1021 tcpv6_fail:
1022         udplitev6_exit();
1023 udplitev6_fail:
1024         udpv6_exit();
1025 udpv6_fail:
1026         ipv6_frag_exit();
1027 ipv6_frag_fail:
1028         ipv6_exthdrs_exit();
1029 ipv6_exthdrs_fail:
1030         addrconf_cleanup();
1031 addrconf_fail:
1032         ip6_flowlabel_cleanup();
1033 ip6_flowlabel_fail:
1034         ip6_route_cleanup();
1035 ip6_route_fail:
1036 #ifdef CONFIG_PROC_FS
1037         if6_proc_exit();
1038 proc_if6_fail:
1039         ipv6_misc_proc_exit();
1040 proc_misc6_fail:
1041         udplite6_proc_exit();
1042 proc_udplite6_fail:
1043         raw6_proc_exit();
1044 proc_raw6_fail:
1045 #endif
1046         ipv6_netfilter_fini();
1047 netfilter_fail:
1048         igmp6_cleanup();
1049 igmp_fail:
1050         ndisc_cleanup();
1051 ndisc_fail:
1052         ip6_mr_cleanup();
1053 ipmr_fail:
1054         icmpv6_cleanup();
1055 icmp_fail:
1056         unregister_pernet_subsys(&inet6_net_ops);
1057 register_pernet_fail:
1058 #ifdef CONFIG_SYSCTL
1059         ipv6_static_sysctl_unregister();
1060 static_sysctl_fail:
1061 #endif
1062         sock_unregister(PF_INET6);
1063         rtnl_unregister_all(PF_INET6);
1064 out_sock_register_fail:
1065         rawv6_exit();
1066 out_unregister_raw_proto:
1067         proto_unregister(&rawv6_prot);
1068 out_unregister_udplite_proto:
1069         proto_unregister(&udplitev6_prot);
1070 out_unregister_udp_proto:
1071         proto_unregister(&udpv6_prot);
1072 out_unregister_tcp_proto:
1073         proto_unregister(&tcpv6_prot);
1074         goto out;
1075 }
1076 module_init(inet6_init);
1077
1078 static void __exit inet6_exit(void)
1079 {
1080         /* First of all disallow new sockets creation. */
1081         sock_unregister(PF_INET6);
1082         /* Disallow any further netlink messages */
1083         rtnl_unregister_all(PF_INET6);
1084
1085 #ifdef CONFIG_SYSCTL
1086         ipv6_sysctl_unregister();
1087 #endif
1088         udpv6_exit();
1089         udplitev6_exit();
1090         tcpv6_exit();
1091
1092         /* Cleanup code parts. */
1093         ipv6_packet_cleanup();
1094         ipv6_frag_exit();
1095         ipv6_exthdrs_exit();
1096         addrconf_cleanup();
1097         ip6_flowlabel_cleanup();
1098         ip6_route_cleanup();
1099 #ifdef CONFIG_PROC_FS
1100
1101         /* Cleanup code parts. */
1102         if6_proc_exit();
1103         ipv6_misc_proc_exit();
1104         udplite6_proc_exit();
1105         raw6_proc_exit();
1106 #endif
1107         ipv6_netfilter_fini();
1108         igmp6_cleanup();
1109         ndisc_cleanup();
1110         ip6_mr_cleanup();
1111         icmpv6_cleanup();
1112         rawv6_exit();
1113
1114         unregister_pernet_subsys(&inet6_net_ops);
1115 #ifdef CONFIG_SYSCTL
1116         ipv6_static_sysctl_unregister();
1117 #endif
1118         proto_unregister(&rawv6_prot);
1119         proto_unregister(&udplitev6_prot);
1120         proto_unregister(&udpv6_prot);
1121         proto_unregister(&tcpv6_prot);
1122 }
1123 module_exit(inet6_exit);
1124
1125 MODULE_ALIAS_NETPROTO(PF_INET6);