git.oblomov.eu Git - linux-2.6/blob - 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 int disable_ipv6 = 0;
  76 module_param_named(disable, disable_ipv6, int, 0);
  77 MODULE_PARM_DESC(disable, "Disable IPv6 such that it is non-functional");
  78
  79 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
  80 {
  81         const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
  82
  83         return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
  84 }
  85
  86 static int inet6_create(struct net *net, struct socket *sock, int protocol)
  87 {
  88         struct inet_sock *inet;
  89         struct ipv6_pinfo *np;
  90         struct sock *sk;
  91         struct inet_protosw *answer;
  92         struct proto *answer_prot;
  93         unsigned char answer_flags;
  94         char answer_no_check;
  95         int try_loading_module = 0;
  96         int err;
  97
  98         if (sock->type != SOCK_RAW &&
  99             sock->type != SOCK_DGRAM &&
 100             !inet_ehash_secret)
 101                 build_ehash_secret();
 102
 103         /* Look for the requested type/protocol pair. */
 104 lookup_protocol:
 105         err = -ESOCKTNOSUPPORT;
 106         rcu_read_lock();
 107         list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
 108
 109                 err = 0;
 110                 /* Check the non-wild match. */
 111                 if (protocol == answer->protocol) {
 112                         if (protocol != IPPROTO_IP)
 113                                 break;
 114                 } else {
 115                         /* Check for the two wild cases. */
 116                         if (IPPROTO_IP == protocol) {
 117                                 protocol = answer->protocol;
 118                                 break;
 119                         }
 120                         if (IPPROTO_IP == answer->protocol)
 121                                 break;
 122                 }
 123                 err = -EPROTONOSUPPORT;
 124         }
 125
 126         if (err) {
 127                 if (try_loading_module < 2) {
 128                         rcu_read_unlock();
 129                         /*
 130                          * Be more specific, e.g. net-pf-10-proto-132-type-1
 131                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
 132                          */
 133                         if (++try_loading_module == 1)
 134                                 request_module("net-pf-%d-proto-%d-type-%d",
 135                                                 PF_INET6, protocol, sock->type);
 136                         /*
 137                          * Fall back to generic, e.g. net-pf-10-proto-132
 138                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
 139                          */
 140                         else
 141                                 request_module("net-pf-%d-proto-%d",
 142                                                 PF_INET6, protocol);
 143                         goto lookup_protocol;
 144                 } else
 145                         goto out_rcu_unlock;
 146         }
 147
 148         err = -EPERM;
 149         if (answer->capability > 0 && !capable(answer->capability))
 150                 goto out_rcu_unlock;
 151
 152         sock->ops = answer->ops;
 153         answer_prot = answer->prot;
 154         answer_no_check = answer->no_check;
 155         answer_flags = answer->flags;
 156         rcu_read_unlock();
 157
 158         WARN_ON(answer_prot->slab == NULL);
 159
 160         err = -ENOBUFS;
 161         sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot);
 162         if (sk == NULL)
 163                 goto out;
 164
 165         sock_init_data(sock, sk);
 166
 167         err = 0;
 168         sk->sk_no_check = answer_no_check;
 169         if (INET_PROTOSW_REUSE & answer_flags)
 170                 sk->sk_reuse = 1;
 171
 172         inet = inet_sk(sk);
 173         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
 174
 175         if (SOCK_RAW == sock->type) {
 176                 inet->num = protocol;
 177                 if (IPPROTO_RAW == protocol)
 178                         inet->hdrincl = 1;
 179         }
 180
 181         sk->sk_destruct         = inet_sock_destruct;
 182         sk->sk_family           = PF_INET6;
 183         sk->sk_protocol         = protocol;
 184
 185         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
 186
 187         inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
 188         np->hop_limit   = -1;
 189         np->mcast_hops  = -1;
 190         np->mc_loop     = 1;
 191         np->pmtudisc    = IPV6_PMTUDISC_WANT;
 192         np->ipv6only    = net->ipv6.sysctl.bindv6only;
 193
 194         /* Init the ipv4 part of the socket since we can have sockets
 195          * using v6 API for ipv4.
 196          */
 197         inet->uc_ttl    = -1;
 198
 199         inet->mc_loop   = 1;
 200         inet->mc_ttl    = 1;
 201         inet->mc_index  = 0;
 202         inet->mc_list   = NULL;
 203
 204         if (ipv4_config.no_pmtu_disc)
 205                 inet->pmtudisc = IP_PMTUDISC_DONT;
 206         else
 207                 inet->pmtudisc = IP_PMTUDISC_WANT;
 208         /*
 209          * Increment only the relevant sk_prot->socks debug field, this changes
 210          * the previous behaviour of incrementing both the equivalent to
 211          * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
 212          *
 213          * This allows better debug granularity as we'll know exactly how many
 214          * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
 215          * transport protocol socks. -acme
 216          */
 217         sk_refcnt_debug_inc(sk);
 218
 219         if (inet->num) {
 220                 /* It assumes that any protocol which allows
 221                  * the user to assign a number at socket
 222                  * creation time automatically shares.
 223                  */
 224                 inet->sport = htons(inet->num);
 225                 sk->sk_prot->hash(sk);
 226         }
 227         if (sk->sk_prot->init) {
 228                 err = sk->sk_prot->init(sk);
 229                 if (err) {
 230                         sk_common_release(sk);
 231                         goto out;
 232                 }
 233         }
 234 out:
 235         return err;
 236 out_rcu_unlock:
 237         rcu_read_unlock();
 238         goto out;
 239 }
 240
 241
 242 /* bind for INET6 API */
 243 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 244 {
 245         struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
 246         struct sock *sk = sock->sk;
 247         struct inet_sock *inet = inet_sk(sk);
 248         struct ipv6_pinfo *np = inet6_sk(sk);
 249         struct net *net = sock_net(sk);
 250         __be32 v4addr = 0;
 251         unsigned short snum;
 252         int addr_type = 0;
 253         int err = 0;
 254
 255         /* If the socket has its own bind function then use it. */
 256         if (sk->sk_prot->bind)
 257                 return sk->sk_prot->bind(sk, uaddr, addr_len);
 258
 259         if (addr_len < SIN6_LEN_RFC2133)
 260                 return -EINVAL;
 261         addr_type = ipv6_addr_type(&addr->sin6_addr);
 262         if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
 263                 return -EINVAL;
 264
 265         snum = ntohs(addr->sin6_port);
 266         if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
 267                 return -EACCES;
 268
 269         lock_sock(sk);
 270
 271         /* Check these errors (active socket, double bind). */
 272         if (sk->sk_state != TCP_CLOSE || inet->num) {
 273                 err = -EINVAL;
 274                 goto out;
 275         }
 276
 277         /* Check if the address belongs to the host. */
 278         if (addr_type == IPV6_ADDR_MAPPED) {
 279                 int chk_addr_ret;
 280
 281                 /* Binding to v4-mapped address on a v6-only socket
 282                  * makes no sense
 283                  */
 284                 if (np->ipv6only) {
 285                         err = -EINVAL;
 286                         goto out;
 287                 }
 288
 289                 /* Reproduce AF_INET checks to make the bindings consitant */
 290                 v4addr = addr->sin6_addr.s6_addr32[3];
 291                 chk_addr_ret = inet_addr_type(net, v4addr);
 292                 if (!sysctl_ip_nonlocal_bind &&
 293                     !(inet->freebind || inet->transparent) &&
 294                     v4addr != htonl(INADDR_ANY) &&
 295                     chk_addr_ret != RTN_LOCAL &&
 296                     chk_addr_ret != RTN_MULTICAST &&
 297                     chk_addr_ret != RTN_BROADCAST)
 298                         goto out;
 299         } else {
 300                 if (addr_type != IPV6_ADDR_ANY) {
 301                         struct net_device *dev = NULL;
 302
 303                         if (addr_type & IPV6_ADDR_LINKLOCAL) {
 304                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 305                                     addr->sin6_scope_id) {
 306                                         /* Override any existing binding, if another one
 307                                          * is supplied by user.
 308                                          */
 309                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
 310                                 }
 311
 312                                 /* Binding to link-local address requires an interface */
 313                                 if (!sk->sk_bound_dev_if) {
 314                                         err = -EINVAL;
 315                                         goto out;
 316                                 }
 317                                 dev = dev_get_by_index(net, sk->sk_bound_dev_if);
 318                                 if (!dev) {
 319                                         err = -ENODEV;
 320                                         goto out;
 321                                 }
 322                         }
 323
 324                         /* ipv4 addr of the socket is invalid.  Only the
 325                          * unspecified and mapped address have a v4 equivalent.
 326                          */
 327                         v4addr = LOOPBACK4_IPV6;
 328                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
 329                                 if (!ipv6_chk_addr(net, &addr->sin6_addr,
 330                                                    dev, 0)) {
 331                                         if (dev)
 332                                                 dev_put(dev);
 333                                         err = -EADDRNOTAVAIL;
 334                                         goto out;
 335                                 }
 336                         }
 337                         if (dev)
 338                                 dev_put(dev);
 339                 }
 340         }
 341
 342         inet->rcv_saddr = v4addr;
 343         inet->saddr = v4addr;
 344
 345         ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
 346
 347         if (!(addr_type & IPV6_ADDR_MULTICAST))
 348                 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
 349
 350         /* Make sure we are allowed to bind here. */
 351         if (sk->sk_prot->get_port(sk, snum)) {
 352                 inet_reset_saddr(sk);
 353                 err = -EADDRINUSE;
 354                 goto out;
 355         }
 356
 357         if (addr_type != IPV6_ADDR_ANY) {
 358                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
 359                 if (addr_type != IPV6_ADDR_MAPPED)
 360                         np->ipv6only = 1;
 361         }
 362         if (snum)
 363                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
 364         inet->sport = htons(inet->num);
 365         inet->dport = 0;
 366         inet->daddr = 0;
 367 out:
 368         release_sock(sk);
 369         return err;
 370 }
 371
 372 EXPORT_SYMBOL(inet6_bind);
 373
 374 int inet6_release(struct socket *sock)
 375 {
 376         struct sock *sk = sock->sk;
 377
 378         if (sk == NULL)
 379                 return -EINVAL;
 380
 381         /* Free mc lists */
 382         ipv6_sock_mc_close(sk);
 383
 384         /* Free ac lists */
 385         ipv6_sock_ac_close(sk);
 386
 387         return inet_release(sock);
 388 }
 389
 390 EXPORT_SYMBOL(inet6_release);
 391
 392 void inet6_destroy_sock(struct sock *sk)
 393 {
 394         struct ipv6_pinfo *np = inet6_sk(sk);
 395         struct sk_buff *skb;
 396         struct ipv6_txoptions *opt;
 397
 398         /* Release rx options */
 399
 400         if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
 401                 kfree_skb(skb);
 402
 403         /* Free flowlabels */
 404         fl6_free_socklist(sk);
 405
 406         /* Free tx options */
 407
 408         if ((opt = xchg(&np->opt, NULL)) != NULL)
 409                 sock_kfree_s(sk, opt, opt->tot_len);
 410 }
 411
 412 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
 413
 414 /*
 415  *      This does both peername and sockname.
 416  */
 417
 418 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 419                  int *uaddr_len, int peer)
 420 {
 421         struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
 422         struct sock *sk = sock->sk;
 423         struct inet_sock *inet = inet_sk(sk);
 424         struct ipv6_pinfo *np = inet6_sk(sk);
 425
 426         sin->sin6_family = AF_INET6;
 427         sin->sin6_flowinfo = 0;
 428         sin->sin6_scope_id = 0;
 429         if (peer) {
 430                 if (!inet->dport)
 431                         return -ENOTCONN;
 432                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
 433                     peer == 1)
 434                         return -ENOTCONN;
 435                 sin->sin6_port = inet->dport;
 436                 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
 437                 if (np->sndflow)
 438                         sin->sin6_flowinfo = np->flow_label;
 439         } else {
 440                 if (ipv6_addr_any(&np->rcv_saddr))
 441                         ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
 442                 else
 443                         ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
 444
 445                 sin->sin6_port = inet->sport;
 446         }
 447         if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
 448                 sin->sin6_scope_id = sk->sk_bound_dev_if;
 449         *uaddr_len = sizeof(*sin);
 450         return(0);
 451 }
 452
 453 EXPORT_SYMBOL(inet6_getname);
 454
 455 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 456 {
 457         struct sock *sk = sock->sk;
 458         struct net *net = sock_net(sk);
 459
 460         switch(cmd)
 461         {
 462         case SIOCGSTAMP:
 463                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
 464
 465         case SIOCGSTAMPNS:
 466                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
 467
 468         case SIOCADDRT:
 469         case SIOCDELRT:
 470
 471                 return(ipv6_route_ioctl(net, cmd, (void __user *)arg));
 472
 473         case SIOCSIFADDR:
 474                 return addrconf_add_ifaddr(net, (void __user *) arg);
 475         case SIOCDIFADDR:
 476                 return addrconf_del_ifaddr(net, (void __user *) arg);
 477         case SIOCSIFDSTADDR:
 478                 return addrconf_set_dstaddr(net, (void __user *) arg);
 479         default:
 480                 if (!sk->sk_prot->ioctl)
 481                         return -ENOIOCTLCMD;
 482                 return sk->sk_prot->ioctl(sk, cmd, arg);
 483         }
 484         /*NOTREACHED*/
 485         return(0);
 486 }
 487
 488 EXPORT_SYMBOL(inet6_ioctl);
 489
 490 const struct proto_ops inet6_stream_ops = {
 491         .family            = PF_INET6,
 492         .owner             = THIS_MODULE,
 493         .release           = inet6_release,
 494         .bind              = inet6_bind,
 495         .connect           = inet_stream_connect,       /* ok           */
 496         .socketpair        = sock_no_socketpair,        /* a do nothing */
 497         .accept            = inet_accept,               /* ok           */
 498         .getname           = inet6_getname,
 499         .poll              = tcp_poll,                  /* ok           */
 500         .ioctl             = inet6_ioctl,               /* must change  */
 501         .listen            = inet_listen,               /* ok           */
 502         .shutdown          = inet_shutdown,             /* ok           */
 503         .setsockopt        = sock_common_setsockopt,    /* ok           */
 504         .getsockopt        = sock_common_getsockopt,    /* ok           */
 505         .sendmsg           = tcp_sendmsg,               /* ok           */
 506         .recvmsg           = sock_common_recvmsg,       /* ok           */
 507         .mmap              = sock_no_mmap,
 508         .sendpage          = tcp_sendpage,
 509         .splice_read       = tcp_splice_read,
 510 #ifdef CONFIG_COMPAT
 511         .compat_setsockopt = compat_sock_common_setsockopt,
 512         .compat_getsockopt = compat_sock_common_getsockopt,
 513 #endif
 514 };
 515
 516 const struct proto_ops inet6_dgram_ops = {
 517         .family            = PF_INET6,
 518         .owner             = THIS_MODULE,
 519         .release           = inet6_release,
 520         .bind              = inet6_bind,
 521         .connect           = inet_dgram_connect,        /* ok           */
 522         .socketpair        = sock_no_socketpair,        /* a do nothing */
 523         .accept            = sock_no_accept,            /* a do nothing */
 524         .getname           = inet6_getname,
 525         .poll              = udp_poll,                  /* ok           */
 526         .ioctl             = inet6_ioctl,               /* must change  */
 527         .listen            = sock_no_listen,            /* ok           */
 528         .shutdown          = inet_shutdown,             /* ok           */
 529         .setsockopt        = sock_common_setsockopt,    /* ok           */
 530         .getsockopt        = sock_common_getsockopt,    /* ok           */
 531         .sendmsg           = inet_sendmsg,              /* ok           */
 532         .recvmsg           = sock_common_recvmsg,       /* ok           */
 533         .mmap              = sock_no_mmap,
 534         .sendpage          = sock_no_sendpage,
 535 #ifdef CONFIG_COMPAT
 536         .compat_setsockopt = compat_sock_common_setsockopt,
 537         .compat_getsockopt = compat_sock_common_getsockopt,
 538 #endif
 539 };
 540
 541 static struct net_proto_family inet6_family_ops = {
 542         .family = PF_INET6,
 543         .create = inet6_create,
 544         .owner  = THIS_MODULE,
 545 };
 546
 547 int inet6_register_protosw(struct inet_protosw *p)
 548 {
 549         struct list_head *lh;
 550         struct inet_protosw *answer;
 551         struct list_head *last_perm;
 552         int protocol = p->protocol;
 553         int ret;
 554
 555         spin_lock_bh(&inetsw6_lock);
 556
 557         ret = -EINVAL;
 558         if (p->type >= SOCK_MAX)
 559                 goto out_illegal;
 560
 561         /* If we are trying to override a permanent protocol, bail. */
 562         answer = NULL;
 563         ret = -EPERM;
 564         last_perm = &inetsw6[p->type];
 565         list_for_each(lh, &inetsw6[p->type]) {
 566                 answer = list_entry(lh, struct inet_protosw, list);
 567
 568                 /* Check only the non-wild match. */
 569                 if (INET_PROTOSW_PERMANENT & answer->flags) {
 570                         if (protocol == answer->protocol)
 571                                 break;
 572                         last_perm = lh;
 573                 }
 574
 575                 answer = NULL;
 576         }
 577         if (answer)
 578                 goto out_permanent;
 579
 580         /* Add the new entry after the last permanent entry if any, so that
 581          * the new entry does not override a permanent entry when matched with
 582          * a wild-card protocol. But it is allowed to override any existing
 583          * non-permanent entry.  This means that when we remove this entry, the
 584          * system automatically returns to the old behavior.
 585          */
 586         list_add_rcu(&p->list, last_perm);
 587         ret = 0;
 588 out:
 589         spin_unlock_bh(&inetsw6_lock);
 590         return ret;
 591
 592 out_permanent:
 593         printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
 594                protocol);
 595         goto out;
 596
 597 out_illegal:
 598         printk(KERN_ERR
 599                "Ignoring attempt to register invalid socket type %d.\n",
 600                p->type);
 601         goto out;
 602 }
 603
 604 EXPORT_SYMBOL(inet6_register_protosw);
 605
 606 void
 607 inet6_unregister_protosw(struct inet_protosw *p)
 608 {
 609         if (INET_PROTOSW_PERMANENT & p->flags) {
 610                 printk(KERN_ERR
 611                        "Attempt to unregister permanent protocol %d.\n",
 612                        p->protocol);
 613         } else {
 614                 spin_lock_bh(&inetsw6_lock);
 615                 list_del_rcu(&p->list);
 616                 spin_unlock_bh(&inetsw6_lock);
 617
 618                 synchronize_net();
 619         }
 620 }
 621
 622 EXPORT_SYMBOL(inet6_unregister_protosw);
 623
 624 int inet6_sk_rebuild_header(struct sock *sk)
 625 {
 626         int err;
 627         struct dst_entry *dst;
 628         struct ipv6_pinfo *np = inet6_sk(sk);
 629
 630         dst = __sk_dst_check(sk, np->dst_cookie);
 631
 632         if (dst == NULL) {
 633                 struct inet_sock *inet = inet_sk(sk);
 634                 struct in6_addr *final_p = NULL, final;
 635                 struct flowi fl;
 636
 637                 memset(&fl, 0, sizeof(fl));
 638                 fl.proto = sk->sk_protocol;
 639                 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 640                 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
 641                 fl.fl6_flowlabel = np->flow_label;
 642                 fl.oif = sk->sk_bound_dev_if;
 643                 fl.fl_ip_dport = inet->dport;
 644                 fl.fl_ip_sport = inet->sport;
 645                 security_sk_classify_flow(sk, &fl);
 646
 647                 if (np->opt && np->opt->srcrt) {
 648                         struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
 649                         ipv6_addr_copy(&final, &fl.fl6_dst);
 650                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 651                         final_p = &final;
 652                 }
 653
 654                 err = ip6_dst_lookup(sk, &dst, &fl);
 655                 if (err) {
 656                         sk->sk_route_caps = 0;
 657                         return err;
 658                 }
 659                 if (final_p)
 660                         ipv6_addr_copy(&fl.fl6_dst, final_p);
 661
 662                 if ((err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0) {
 663                         sk->sk_err_soft = -err;
 664                         return err;
 665                 }
 666
 667                 __ip6_dst_store(sk, dst, NULL, NULL);
 668         }
 669
 670         return 0;
 671 }
 672
 673 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
 674
 675 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
 676 {
 677         struct ipv6_pinfo *np = inet6_sk(sk);
 678         struct inet6_skb_parm *opt = IP6CB(skb);
 679
 680         if (np->rxopt.all) {
 681                 if ((opt->hop && (np->rxopt.bits.hopopts ||
 682                                   np->rxopt.bits.ohopopts)) ||
 683                     ((IPV6_FLOWINFO_MASK &
 684                       *(__be32 *)skb_network_header(skb)) &&
 685                      np->rxopt.bits.rxflow) ||
 686                     (opt->srcrt && (np->rxopt.bits.srcrt ||
 687                      np->rxopt.bits.osrcrt)) ||
 688                     ((opt->dst1 || opt->dst0) &&
 689                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
 690                         return 1;
 691         }
 692         return 0;
 693 }
 694
 695 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
 696
 697 static int ipv6_gso_pull_exthdrs(struct sk_buff *skb, int proto)
 698 {
 699         struct inet6_protocol *ops = NULL;
 700
 701         for (;;) {
 702                 struct ipv6_opt_hdr *opth;
 703                 int len;
 704
 705                 if (proto != NEXTHDR_HOP) {
 706                         ops = rcu_dereference(inet6_protos[proto]);
 707
 708                         if (unlikely(!ops))
 709                                 break;
 710
 711                         if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
 712                                 break;
 713                 }
 714
 715                 if (unlikely(!pskb_may_pull(skb, 8)))
 716                         break;
 717
 718                 opth = (void *)skb->data;
 719                 len = ipv6_optlen(opth);
 720
 721                 if (unlikely(!pskb_may_pull(skb, len)))
 722                         break;
 723
 724                 proto = opth->nexthdr;
 725                 __skb_pull(skb, len);
 726         }
 727
 728         return proto;
 729 }
 730
 731 static int ipv6_gso_send_check(struct sk_buff *skb)
 732 {
 733         struct ipv6hdr *ipv6h;
 734         struct inet6_protocol *ops;
 735         int err = -EINVAL;
 736
 737         if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
 738                 goto out;
 739
 740         ipv6h = ipv6_hdr(skb);
 741         __skb_pull(skb, sizeof(*ipv6h));
 742         err = -EPROTONOSUPPORT;
 743
 744         rcu_read_lock();
 745         ops = rcu_dereference(inet6_protos[
 746                 ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]);
 747
 748         if (likely(ops && ops->gso_send_check)) {
 749                 skb_reset_transport_header(skb);
 750                 err = ops->gso_send_check(skb);
 751         }
 752         rcu_read_unlock();
 753
 754 out:
 755         return err;
 756 }
 757
 758 static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features)
 759 {
 760         struct sk_buff *segs = ERR_PTR(-EINVAL);
 761         struct ipv6hdr *ipv6h;
 762         struct inet6_protocol *ops;
 763
 764         if (!(features & NETIF_F_V6_CSUM))
 765                 features &= ~NETIF_F_SG;
 766
 767         if (unlikely(skb_shinfo(skb)->gso_type &
 768                      ~(SKB_GSO_UDP |
 769                        SKB_GSO_DODGY |
 770                        SKB_GSO_TCP_ECN |
 771                        SKB_GSO_TCPV6 |
 772                        0)))
 773                 goto out;
 774
 775         if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
 776                 goto out;
 777
 778         ipv6h = ipv6_hdr(skb);
 779         __skb_pull(skb, sizeof(*ipv6h));
 780         segs = ERR_PTR(-EPROTONOSUPPORT);
 781
 782         rcu_read_lock();
 783         ops = rcu_dereference(inet6_protos[
 784                 ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]);
 785
 786         if (likely(ops && ops->gso_segment)) {
 787                 skb_reset_transport_header(skb);
 788                 segs = ops->gso_segment(skb, features);
 789         }
 790         rcu_read_unlock();
 791
 792         if (unlikely(IS_ERR(segs)))
 793                 goto out;
 794
 795         for (skb = segs; skb; skb = skb->next) {
 796                 ipv6h = ipv6_hdr(skb);
 797                 ipv6h->payload_len = htons(skb->len - skb->mac_len -
 798                                            sizeof(*ipv6h));
 799         }
 800
 801 out:
 802         return segs;
 803 }
 804
 805 struct ipv6_gro_cb {
 806         struct napi_gro_cb napi;
 807         int proto;
 808 };
 809
 810 #define IPV6_GRO_CB(skb) ((struct ipv6_gro_cb *)(skb)->cb)
 811
 812 static struct sk_buff **ipv6_gro_receive(struct sk_buff **head,
 813                                          struct sk_buff *skb)
 814 {
 815         struct inet6_protocol *ops;
 816         struct sk_buff **pp = NULL;
 817         struct sk_buff *p;
 818         struct ipv6hdr *iph;
 819         unsigned int nlen;
 820         int flush = 1;
 821         int proto;
 822         __wsum csum;
 823
 824         iph = skb_gro_header(skb, sizeof(*iph));
 825         if (unlikely(!iph))
 826                 goto out;
 827
 828         skb_gro_pull(skb, sizeof(*iph));
 829         skb_set_transport_header(skb, skb_gro_offset(skb));
 830
 831         flush += ntohs(iph->payload_len) != skb_gro_len(skb);
 832
 833         rcu_read_lock();
 834         proto = iph->nexthdr;
 835         ops = rcu_dereference(inet6_protos[proto]);
 836         if (!ops || !ops->gro_receive) {
 837                 __pskb_pull(skb, skb_gro_offset(skb));
 838                 proto = ipv6_gso_pull_exthdrs(skb, proto);
 839                 skb_gro_pull(skb, -skb_transport_offset(skb));
 840                 skb_reset_transport_header(skb);
 841                 __skb_push(skb, skb_gro_offset(skb));
 842
 843                 if (!ops || !ops->gro_receive)
 844                         goto out_unlock;
 845
 846                 iph = ipv6_hdr(skb);
 847         }
 848
 849         IPV6_GRO_CB(skb)->proto = proto;
 850
 851         flush--;
 852         nlen = skb_network_header_len(skb);
 853
 854         for (p = *head; p; p = p->next) {
 855                 struct ipv6hdr *iph2;
 856
 857                 if (!NAPI_GRO_CB(p)->same_flow)
 858                         continue;
 859
 860                 iph2 = ipv6_hdr(p);
 861
 862                 /* All fields must match except length. */
 863                 if (nlen != skb_network_header_len(p) ||
 864                     memcmp(iph, iph2, offsetof(struct ipv6hdr, payload_len)) ||
 865                     memcmp(&iph->nexthdr, &iph2->nexthdr,
 866                            nlen - offsetof(struct ipv6hdr, nexthdr))) {
 867                         NAPI_GRO_CB(p)->same_flow = 0;
 868                         continue;
 869                 }
 870
 871                 NAPI_GRO_CB(p)->flush |= flush;
 872         }
 873
 874         NAPI_GRO_CB(skb)->flush |= flush;
 875
 876         csum = skb->csum;
 877         skb_postpull_rcsum(skb, iph, skb_network_header_len(skb));
 878
 879         pp = ops->gro_receive(head, skb);
 880
 881         skb->csum = csum;
 882
 883 out_unlock:
 884         rcu_read_unlock();
 885
 886 out:
 887         NAPI_GRO_CB(skb)->flush |= flush;
 888
 889         return pp;
 890 }
 891
 892 static int ipv6_gro_complete(struct sk_buff *skb)
 893 {
 894         struct inet6_protocol *ops;
 895         struct ipv6hdr *iph = ipv6_hdr(skb);
 896         int err = -ENOSYS;
 897
 898         iph->payload_len = htons(skb->len - skb_network_offset(skb) -
 899                                  sizeof(*iph));
 900
 901         rcu_read_lock();
 902         ops = rcu_dereference(inet6_protos[IPV6_GRO_CB(skb)->proto]);
 903         if (WARN_ON(!ops || !ops->gro_complete))
 904                 goto out_unlock;
 905
 906         err = ops->gro_complete(skb);
 907
 908 out_unlock:
 909         rcu_read_unlock();
 910
 911         return err;
 912 }
 913
 914 static struct packet_type ipv6_packet_type __read_mostly = {
 915         .type = cpu_to_be16(ETH_P_IPV6),
 916         .func = ipv6_rcv,
 917         .gso_send_check = ipv6_gso_send_check,
 918         .gso_segment = ipv6_gso_segment,
 919         .gro_receive = ipv6_gro_receive,
 920         .gro_complete = ipv6_gro_complete,
 921 };
 922
 923 static int __init ipv6_packet_init(void)
 924 {
 925         dev_add_pack(&ipv6_packet_type);
 926         return 0;
 927 }
 928
 929 static void ipv6_packet_cleanup(void)
 930 {
 931         dev_remove_pack(&ipv6_packet_type);
 932 }
 933
 934 static int __net_init ipv6_init_mibs(struct net *net)
 935 {
 936         if (snmp_mib_init((void **)net->mib.udp_stats_in6,
 937                           sizeof (struct udp_mib)) < 0)
 938                 return -ENOMEM;
 939         if (snmp_mib_init((void **)net->mib.udplite_stats_in6,
 940                           sizeof (struct udp_mib)) < 0)
 941                 goto err_udplite_mib;
 942         if (snmp_mib_init((void **)net->mib.ipv6_statistics,
 943                           sizeof(struct ipstats_mib)) < 0)
 944                 goto err_ip_mib;
 945         if (snmp_mib_init((void **)net->mib.icmpv6_statistics,
 946                           sizeof(struct icmpv6_mib)) < 0)
 947                 goto err_icmp_mib;
 948         if (snmp_mib_init((void **)net->mib.icmpv6msg_statistics,
 949                           sizeof(struct icmpv6msg_mib)) < 0)
 950                 goto err_icmpmsg_mib;
 951         return 0;
 952
 953 err_icmpmsg_mib:
 954         snmp_mib_free((void **)net->mib.icmpv6_statistics);
 955 err_icmp_mib:
 956         snmp_mib_free((void **)net->mib.ipv6_statistics);
 957 err_ip_mib:
 958         snmp_mib_free((void **)net->mib.udplite_stats_in6);
 959 err_udplite_mib:
 960         snmp_mib_free((void **)net->mib.udp_stats_in6);
 961         return -ENOMEM;
 962 }
 963
 964 static void __net_exit ipv6_cleanup_mibs(struct net *net)
 965 {
 966         snmp_mib_free((void **)net->mib.udp_stats_in6);
 967         snmp_mib_free((void **)net->mib.udplite_stats_in6);
 968         snmp_mib_free((void **)net->mib.ipv6_statistics);
 969         snmp_mib_free((void **)net->mib.icmpv6_statistics);
 970         snmp_mib_free((void **)net->mib.icmpv6msg_statistics);
 971 }
 972
 973 static int __net_init inet6_net_init(struct net *net)
 974 {
 975         int err = 0;
 976
 977         net->ipv6.sysctl.bindv6only = 0;
 978         net->ipv6.sysctl.icmpv6_time = 1*HZ;
 979
 980         err = ipv6_init_mibs(net);
 981         if (err)
 982                 return err;
 983 #ifdef CONFIG_PROC_FS
 984         err = udp6_proc_init(net);
 985         if (err)
 986                 goto out;
 987         err = tcp6_proc_init(net);
 988         if (err)
 989                 goto proc_tcp6_fail;
 990         err = ac6_proc_init(net);
 991         if (err)
 992                 goto proc_ac6_fail;
 993 #endif
 994         return err;
 995
 996 #ifdef CONFIG_PROC_FS
 997 proc_ac6_fail:
 998         tcp6_proc_exit(net);
 999 proc_tcp6_fail:
1000         udp6_proc_exit(net);
1001 out:
1002         ipv6_cleanup_mibs(net);
1003         return err;
1004 #endif
1005 }
1006
1007 static void inet6_net_exit(struct net *net)
1008 {
1009 #ifdef CONFIG_PROC_FS
1010         udp6_proc_exit(net);
1011         tcp6_proc_exit(net);
1012         ac6_proc_exit(net);
1013 #endif
1014         ipv6_cleanup_mibs(net);
1015 }
1016
1017 static struct pernet_operations inet6_net_ops = {
1018         .init = inet6_net_init,
1019         .exit = inet6_net_exit,
1020 };
1021
1022 static int __init inet6_init(void)
1023 {
1024         struct sk_buff *dummy_skb;
1025         struct list_head *r;
1026         int err = 0;
1027
1028         BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
1029
1030         /* Register the socket-side information for inet6_create.  */
1031         for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
1032                 INIT_LIST_HEAD(r);
1033
1034         if (disable_ipv6) {
1035                 printk(KERN_INFO
1036                        "IPv6: Loaded, but administratively disabled, "
1037                        "reboot required to enable\n");
1038                 goto out;
1039         }
1040
1041         err = proto_register(&tcpv6_prot, 1);
1042         if (err)
1043                 goto out;
1044
1045         err = proto_register(&udpv6_prot, 1);
1046         if (err)
1047                 goto out_unregister_tcp_proto;
1048
1049         err = proto_register(&udplitev6_prot, 1);
1050         if (err)
1051                 goto out_unregister_udp_proto;
1052
1053         err = proto_register(&rawv6_prot, 1);
1054         if (err)
1055                 goto out_unregister_udplite_proto;
1056
1057
1058         /* We MUST register RAW sockets before we create the ICMP6,
1059          * IGMP6, or NDISC control sockets.
1060          */
1061         err = rawv6_init();
1062         if (err)
1063                 goto out_unregister_raw_proto;
1064
1065         /* Register the family here so that the init calls below will
1066          * be able to create sockets. (?? is this dangerous ??)
1067          */
1068         err = sock_register(&inet6_family_ops);
1069         if (err)
1070                 goto out_sock_register_fail;
1071
1072 #ifdef CONFIG_SYSCTL
1073         err = ipv6_static_sysctl_register();
1074         if (err)
1075                 goto static_sysctl_fail;
1076 #endif
1077         /*
1078          *      ipngwg API draft makes clear that the correct semantics
1079          *      for TCP and UDP is to consider one TCP and UDP instance
1080          *      in a host availiable by both INET and INET6 APIs and
1081          *      able to communicate via both network protocols.
1082          */
1083
1084         err = register_pernet_subsys(&inet6_net_ops);
1085         if (err)
1086                 goto register_pernet_fail;
1087         err = icmpv6_init();
1088         if (err)
1089                 goto icmp_fail;
1090         err = ip6_mr_init();
1091         if (err)
1092                 goto ipmr_fail;
1093         err = ndisc_init();
1094         if (err)
1095                 goto ndisc_fail;
1096         err = igmp6_init();
1097         if (err)
1098                 goto igmp_fail;
1099         err = ipv6_netfilter_init();
1100         if (err)
1101                 goto netfilter_fail;
1102         /* Create /proc/foo6 entries. */
1103 #ifdef CONFIG_PROC_FS
1104         err = -ENOMEM;
1105         if (raw6_proc_init())
1106                 goto proc_raw6_fail;
1107         if (udplite6_proc_init())
1108                 goto proc_udplite6_fail;
1109         if (ipv6_misc_proc_init())
1110                 goto proc_misc6_fail;
1111         if (if6_proc_init())
1112                 goto proc_if6_fail;
1113 #endif
1114         err = ip6_route_init();
1115         if (err)
1116                 goto ip6_route_fail;
1117         err = ip6_flowlabel_init();
1118         if (err)
1119                 goto ip6_flowlabel_fail;
1120         err = addrconf_init();
1121         if (err)
1122                 goto addrconf_fail;
1123
1124         /* Init v6 extension headers. */
1125         err = ipv6_exthdrs_init();
1126         if (err)
1127                 goto ipv6_exthdrs_fail;
1128
1129         err = ipv6_frag_init();
1130         if (err)
1131                 goto ipv6_frag_fail;
1132
1133         /* Init v6 transport protocols. */
1134         err = udpv6_init();
1135         if (err)
1136                 goto udpv6_fail;
1137
1138         err = udplitev6_init();
1139         if (err)
1140                 goto udplitev6_fail;
1141
1142         err = tcpv6_init();
1143         if (err)
1144                 goto tcpv6_fail;
1145
1146         err = ipv6_packet_init();
1147         if (err)
1148                 goto ipv6_packet_fail;
1149
1150 #ifdef CONFIG_SYSCTL
1151         err = ipv6_sysctl_register();
1152         if (err)
1153                 goto sysctl_fail;
1154 #endif
1155 out:
1156         return err;
1157
1158 #ifdef CONFIG_SYSCTL
1159 sysctl_fail:
1160         ipv6_packet_cleanup();
1161 #endif
1162 ipv6_packet_fail:
1163         tcpv6_exit();
1164 tcpv6_fail:
1165         udplitev6_exit();
1166 udplitev6_fail:
1167         udpv6_exit();
1168 udpv6_fail:
1169         ipv6_frag_exit();
1170 ipv6_frag_fail:
1171         ipv6_exthdrs_exit();
1172 ipv6_exthdrs_fail:
1173         addrconf_cleanup();
1174 addrconf_fail:
1175         ip6_flowlabel_cleanup();
1176 ip6_flowlabel_fail:
1177         ip6_route_cleanup();
1178 ip6_route_fail:
1179 #ifdef CONFIG_PROC_FS
1180         if6_proc_exit();
1181 proc_if6_fail:
1182         ipv6_misc_proc_exit();
1183 proc_misc6_fail:
1184         udplite6_proc_exit();
1185 proc_udplite6_fail:
1186         raw6_proc_exit();
1187 proc_raw6_fail:
1188 #endif
1189         ipv6_netfilter_fini();
1190 netfilter_fail:
1191         igmp6_cleanup();
1192 igmp_fail:
1193         ndisc_cleanup();
1194 ndisc_fail:
1195         ip6_mr_cleanup();
1196 ipmr_fail:
1197         icmpv6_cleanup();
1198 icmp_fail:
1199         unregister_pernet_subsys(&inet6_net_ops);
1200 register_pernet_fail:
1201 #ifdef CONFIG_SYSCTL
1202         ipv6_static_sysctl_unregister();
1203 static_sysctl_fail:
1204 #endif
1205         sock_unregister(PF_INET6);
1206         rtnl_unregister_all(PF_INET6);
1207 out_sock_register_fail:
1208         rawv6_exit();
1209 out_unregister_raw_proto:
1210         proto_unregister(&rawv6_prot);
1211 out_unregister_udplite_proto:
1212         proto_unregister(&udplitev6_prot);
1213 out_unregister_udp_proto:
1214         proto_unregister(&udpv6_prot);
1215 out_unregister_tcp_proto:
1216         proto_unregister(&tcpv6_prot);
1217         goto out;
1218 }
1219 module_init(inet6_init);
1220
1221 static void __exit inet6_exit(void)
1222 {
1223         if (disable_ipv6)
1224                 return;
1225
1226         /* First of all disallow new sockets creation. */
1227         sock_unregister(PF_INET6);
1228         /* Disallow any further netlink messages */
1229         rtnl_unregister_all(PF_INET6);
1230
1231 #ifdef CONFIG_SYSCTL
1232         ipv6_sysctl_unregister();
1233 #endif
1234         udpv6_exit();
1235         udplitev6_exit();
1236         tcpv6_exit();
1237
1238         /* Cleanup code parts. */
1239         ipv6_packet_cleanup();
1240         ipv6_frag_exit();
1241         ipv6_exthdrs_exit();
1242         addrconf_cleanup();
1243         ip6_flowlabel_cleanup();
1244         ip6_route_cleanup();
1245 #ifdef CONFIG_PROC_FS
1246
1247         /* Cleanup code parts. */
1248         if6_proc_exit();
1249         ipv6_misc_proc_exit();
1250         udplite6_proc_exit();
1251         raw6_proc_exit();
1252 #endif
1253         ipv6_netfilter_fini();
1254         igmp6_cleanup();
1255         ndisc_cleanup();
1256         ip6_mr_cleanup();
1257         icmpv6_cleanup();
1258         rawv6_exit();
1259
1260         unregister_pernet_subsys(&inet6_net_ops);
1261 #ifdef CONFIG_SYSCTL
1262         ipv6_static_sysctl_unregister();
1263 #endif
1264         proto_unregister(&rawv6_prot);
1265         proto_unregister(&udplitev6_prot);
1266         proto_unregister(&udpv6_prot);
1267         proto_unregister(&tcpv6_prot);
1268 }
1269 module_exit(inet6_exit);
1270
1271 MODULE_ALIAS_NETPROTO(PF_INET6);