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 int sysctl_ipv6_bindv6only __read_mostly;
  70
  71 /* The inetsw table contains everything that inet_create needs to
  72  * build a new socket.
  73  */
  74 static struct list_head inetsw6[SOCK_MAX];
  75 static DEFINE_SPINLOCK(inetsw6_lock);
  76
  77 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
  78 {
  79         const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
  80
  81         return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
  82 }
  83
  84 static int inet6_create(struct socket *sock, int protocol)
  85 {
  86         struct inet_sock *inet;
  87         struct ipv6_pinfo *np;
  88         struct sock *sk;
  89         struct list_head *p;
  90         struct inet_protosw *answer;
  91         struct proto *answer_prot;
  92         unsigned char answer_flags;
  93         char answer_no_check;
  94         int try_loading_module = 0;
  95         int err;
  96
  97         if (sock->type != SOCK_RAW &&
  98             sock->type != SOCK_DGRAM &&
  99             !inet_ehash_secret)
 100                 build_ehash_secret();
 101
 102         /* Look for the requested type/protocol pair. */
 103         answer = NULL;
 104 lookup_protocol:
 105         err = -ESOCKTNOSUPPORT;
 106         rcu_read_lock();
 107         list_for_each_rcu(p, &inetsw6[sock->type]) {
 108                 answer = list_entry(p, struct inet_protosw, list);
 109
 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                 answer = NULL;
 125         }
 126
 127         if (!answer) {
 128                 if (try_loading_module < 2) {
 129                         rcu_read_unlock();
 130                         /*
 131                          * Be more specific, e.g. net-pf-10-proto-132-type-1
 132                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
 133                          */
 134                         if (++try_loading_module == 1)
 135                                 request_module("net-pf-%d-proto-%d-type-%d",
 136                                                 PF_INET6, protocol, sock->type);
 137                         /*
 138                          * Fall back to generic, e.g. net-pf-10-proto-132
 139                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
 140                          */
 141                         else
 142                                 request_module("net-pf-%d-proto-%d",
 143                                                 PF_INET6, protocol);
 144                         goto lookup_protocol;
 145                 } else
 146                         goto out_rcu_unlock;
 147         }
 148
 149         err = -EPERM;
 150         if (answer->capability > 0 && !capable(answer->capability))
 151                 goto out_rcu_unlock;
 152
 153         sock->ops = answer->ops;
 154         answer_prot = answer->prot;
 155         answer_no_check = answer->no_check;
 156         answer_flags = answer->flags;
 157         rcu_read_unlock();
 158
 159         BUG_TRAP(answer_prot->slab != NULL);
 160
 161         err = -ENOBUFS;
 162         sk = sk_alloc(PF_INET6, GFP_KERNEL, answer_prot, 1);
 163         if (sk == NULL)
 164                 goto out;
 165
 166         sock_init_data(sock, sk);
 167
 168         err = 0;
 169         sk->sk_no_check = answer_no_check;
 170         if (INET_PROTOSW_REUSE & answer_flags)
 171                 sk->sk_reuse = 1;
 172
 173         inet = inet_sk(sk);
 174         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
 175
 176         if (SOCK_RAW == sock->type) {
 177                 inet->num = protocol;
 178                 if (IPPROTO_RAW == protocol)
 179                         inet->hdrincl = 1;
 180         }
 181
 182         sk->sk_destruct         = inet_sock_destruct;
 183         sk->sk_family           = PF_INET6;
 184         sk->sk_protocol         = protocol;
 185
 186         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
 187
 188         inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
 189         np->hop_limit   = -1;
 190         np->mcast_hops  = -1;
 191         np->mc_loop     = 1;
 192         np->pmtudisc    = IPV6_PMTUDISC_WANT;
 193         np->ipv6only    = sysctl_ipv6_bindv6only;
 194
 195         /* Init the ipv4 part of the socket since we can have sockets
 196          * using v6 API for ipv4.
 197          */
 198         inet->uc_ttl    = -1;
 199
 200         inet->mc_loop   = 1;
 201         inet->mc_ttl    = 1;
 202         inet->mc_index  = 0;
 203         inet->mc_list   = NULL;
 204
 205         if (ipv4_config.no_pmtu_disc)
 206                 inet->pmtudisc = IP_PMTUDISC_DONT;
 207         else
 208                 inet->pmtudisc = IP_PMTUDISC_WANT;
 209         /*
 210          * Increment only the relevant sk_prot->socks debug field, this changes
 211          * the previous behaviour of incrementing both the equivalent to
 212          * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
 213          *
 214          * This allows better debug granularity as we'll know exactly how many
 215          * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
 216          * transport protocol socks. -acme
 217          */
 218         sk_refcnt_debug_inc(sk);
 219
 220         if (inet->num) {
 221                 /* It assumes that any protocol which allows
 222                  * the user to assign a number at socket
 223                  * creation time automatically shares.
 224                  */
 225                 inet->sport = htons(inet->num);
 226                 sk->sk_prot->hash(sk);
 227         }
 228         if (sk->sk_prot->init) {
 229                 err = sk->sk_prot->init(sk);
 230                 if (err) {
 231                         sk_common_release(sk);
 232                         goto out;
 233                 }
 234         }
 235 out:
 236         return err;
 237 out_rcu_unlock:
 238         rcu_read_unlock();
 239         goto out;
 240 }
 241
 242
 243 /* bind for INET6 API */
 244 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 245 {
 246         struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
 247         struct sock *sk = sock->sk;
 248         struct inet_sock *inet = inet_sk(sk);
 249         struct ipv6_pinfo *np = inet6_sk(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                 v4addr = addr->sin6_addr.s6_addr32[3];
 280                 if (inet_addr_type(v4addr) != RTN_LOCAL) {
 281                         err = -EADDRNOTAVAIL;
 282                         goto out;
 283                 }
 284         } else {
 285                 if (addr_type != IPV6_ADDR_ANY) {
 286                         struct net_device *dev = NULL;
 287
 288                         if (addr_type & IPV6_ADDR_LINKLOCAL) {
 289                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 290                                     addr->sin6_scope_id) {
 291                                         /* Override any existing binding, if another one
 292                                          * is supplied by user.
 293                                          */
 294                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
 295                                 }
 296
 297                                 /* Binding to link-local address requires an interface */
 298                                 if (!sk->sk_bound_dev_if) {
 299                                         err = -EINVAL;
 300                                         goto out;
 301                                 }
 302                                 dev = dev_get_by_index(sk->sk_bound_dev_if);
 303                                 if (!dev) {
 304                                         err = -ENODEV;
 305                                         goto out;
 306                                 }
 307                         }
 308
 309                         /* ipv4 addr of the socket is invalid.  Only the
 310                          * unspecified and mapped address have a v4 equivalent.
 311                          */
 312                         v4addr = LOOPBACK4_IPV6;
 313                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
 314                                 if (!ipv6_chk_addr(&addr->sin6_addr, 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
 442         switch(cmd)
 443         {
 444         case SIOCGSTAMP:
 445                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
 446
 447         case SIOCGSTAMPNS:
 448                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
 449
 450         case SIOCADDRT:
 451         case SIOCDELRT:
 452
 453                 return(ipv6_route_ioctl(cmd,(void __user *)arg));
 454
 455         case SIOCSIFADDR:
 456                 return addrconf_add_ifaddr((void __user *) arg);
 457         case SIOCDIFADDR:
 458                 return addrconf_del_ifaddr((void __user *) arg);
 459         case SIOCSIFDSTADDR:
 460                 return addrconf_set_dstaddr((void __user *) arg);
 461         default:
 462                 if (!sk->sk_prot->ioctl)
 463                         return -ENOIOCTLCMD;
 464                 return sk->sk_prot->ioctl(sk, cmd, arg);
 465         }
 466         /*NOTREACHED*/
 467         return(0);
 468 }
 469
 470 EXPORT_SYMBOL(inet6_ioctl);
 471
 472 const struct proto_ops inet6_stream_ops = {
 473         .family            = PF_INET6,
 474         .owner             = THIS_MODULE,
 475         .release           = inet6_release,
 476         .bind              = inet6_bind,
 477         .connect           = inet_stream_connect,       /* ok           */
 478         .socketpair        = sock_no_socketpair,        /* a do nothing */
 479         .accept            = inet_accept,               /* ok           */
 480         .getname           = inet6_getname,
 481         .poll              = tcp_poll,                  /* ok           */
 482         .ioctl             = inet6_ioctl,               /* must change  */
 483         .listen            = inet_listen,               /* ok           */
 484         .shutdown          = inet_shutdown,             /* ok           */
 485         .setsockopt        = sock_common_setsockopt,    /* ok           */
 486         .getsockopt        = sock_common_getsockopt,    /* ok           */
 487         .sendmsg           = tcp_sendmsg,               /* ok           */
 488         .recvmsg           = sock_common_recvmsg,       /* ok           */
 489         .mmap              = sock_no_mmap,
 490         .sendpage          = tcp_sendpage,
 491 #ifdef CONFIG_COMPAT
 492         .compat_setsockopt = compat_sock_common_setsockopt,
 493         .compat_getsockopt = compat_sock_common_getsockopt,
 494 #endif
 495 };
 496
 497 const struct proto_ops inet6_dgram_ops = {
 498         .family            = PF_INET6,
 499         .owner             = THIS_MODULE,
 500         .release           = inet6_release,
 501         .bind              = inet6_bind,
 502         .connect           = inet_dgram_connect,        /* ok           */
 503         .socketpair        = sock_no_socketpair,        /* a do nothing */
 504         .accept            = sock_no_accept,            /* a do nothing */
 505         .getname           = inet6_getname,
 506         .poll              = udp_poll,                  /* ok           */
 507         .ioctl             = inet6_ioctl,               /* must change  */
 508         .listen            = sock_no_listen,            /* ok           */
 509         .shutdown          = inet_shutdown,             /* ok           */
 510         .setsockopt        = sock_common_setsockopt,    /* ok           */
 511         .getsockopt        = sock_common_getsockopt,    /* ok           */
 512         .sendmsg           = inet_sendmsg,              /* ok           */
 513         .recvmsg           = sock_common_recvmsg,       /* ok           */
 514         .mmap              = sock_no_mmap,
 515         .sendpage          = sock_no_sendpage,
 516 #ifdef CONFIG_COMPAT
 517         .compat_setsockopt = compat_sock_common_setsockopt,
 518         .compat_getsockopt = compat_sock_common_getsockopt,
 519 #endif
 520 };
 521
 522 static struct net_proto_family inet6_family_ops = {
 523         .family = PF_INET6,
 524         .create = inet6_create,
 525         .owner  = THIS_MODULE,
 526 };
 527
 528 /* Same as inet6_dgram_ops, sans udp_poll.  */
 529 static const struct proto_ops inet6_sockraw_ops = {
 530         .family            = PF_INET6,
 531         .owner             = THIS_MODULE,
 532         .release           = inet6_release,
 533         .bind              = inet6_bind,
 534         .connect           = inet_dgram_connect,        /* ok           */
 535         .socketpair        = sock_no_socketpair,        /* a do nothing */
 536         .accept            = sock_no_accept,            /* a do nothing */
 537         .getname           = inet6_getname,
 538         .poll              = datagram_poll,             /* ok           */
 539         .ioctl             = inet6_ioctl,               /* must change  */
 540         .listen            = sock_no_listen,            /* ok           */
 541         .shutdown          = inet_shutdown,             /* ok           */
 542         .setsockopt        = sock_common_setsockopt,    /* ok           */
 543         .getsockopt        = sock_common_getsockopt,    /* ok           */
 544         .sendmsg           = inet_sendmsg,              /* ok           */
 545         .recvmsg           = sock_common_recvmsg,       /* ok           */
 546         .mmap              = sock_no_mmap,
 547         .sendpage          = sock_no_sendpage,
 548 #ifdef CONFIG_COMPAT
 549         .compat_setsockopt = compat_sock_common_setsockopt,
 550         .compat_getsockopt = compat_sock_common_getsockopt,
 551 #endif
 552 };
 553
 554 static struct inet_protosw rawv6_protosw = {
 555         .type           = SOCK_RAW,
 556         .protocol       = IPPROTO_IP,   /* wild card */
 557         .prot           = &rawv6_prot,
 558         .ops            = &inet6_sockraw_ops,
 559         .capability     = CAP_NET_RAW,
 560         .no_check       = UDP_CSUM_DEFAULT,
 561         .flags          = INET_PROTOSW_REUSE,
 562 };
 563
 564 void
 565 inet6_register_protosw(struct inet_protosw *p)
 566 {
 567         struct list_head *lh;
 568         struct inet_protosw *answer;
 569         int protocol = p->protocol;
 570         struct list_head *last_perm;
 571
 572         spin_lock_bh(&inetsw6_lock);
 573
 574         if (p->type >= SOCK_MAX)
 575                 goto out_illegal;
 576
 577         /* If we are trying to override a permanent protocol, bail. */
 578         answer = NULL;
 579         last_perm = &inetsw6[p->type];
 580         list_for_each(lh, &inetsw6[p->type]) {
 581                 answer = list_entry(lh, struct inet_protosw, list);
 582
 583                 /* Check only the non-wild match. */
 584                 if (INET_PROTOSW_PERMANENT & answer->flags) {
 585                         if (protocol == answer->protocol)
 586                                 break;
 587                         last_perm = lh;
 588                 }
 589
 590                 answer = NULL;
 591         }
 592         if (answer)
 593                 goto out_permanent;
 594
 595         /* Add the new entry after the last permanent entry if any, so that
 596          * the new entry does not override a permanent entry when matched with
 597          * a wild-card protocol. But it is allowed to override any existing
 598          * non-permanent entry.  This means that when we remove this entry, the
 599          * system automatically returns to the old behavior.
 600          */
 601         list_add_rcu(&p->list, last_perm);
 602 out:
 603         spin_unlock_bh(&inetsw6_lock);
 604         return;
 605
 606 out_permanent:
 607         printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
 608                protocol);
 609         goto out;
 610
 611 out_illegal:
 612         printk(KERN_ERR
 613                "Ignoring attempt to register invalid socket type %d.\n",
 614                p->type);
 615         goto out;
 616 }
 617
 618 EXPORT_SYMBOL(inet6_register_protosw);
 619
 620 void
 621 inet6_unregister_protosw(struct inet_protosw *p)
 622 {
 623         if (INET_PROTOSW_PERMANENT & p->flags) {
 624                 printk(KERN_ERR
 625                        "Attempt to unregister permanent protocol %d.\n",
 626                        p->protocol);
 627         } else {
 628                 spin_lock_bh(&inetsw6_lock);
 629                 list_del_rcu(&p->list);
 630                 spin_unlock_bh(&inetsw6_lock);
 631
 632                 synchronize_net();
 633         }
 634 }
 635
 636 EXPORT_SYMBOL(inet6_unregister_protosw);
 637
 638 int inet6_sk_rebuild_header(struct sock *sk)
 639 {
 640         int err;
 641         struct dst_entry *dst;
 642         struct ipv6_pinfo *np = inet6_sk(sk);
 643
 644         dst = __sk_dst_check(sk, np->dst_cookie);
 645
 646         if (dst == NULL) {
 647                 struct inet_sock *inet = inet_sk(sk);
 648                 struct in6_addr *final_p = NULL, final;
 649                 struct flowi fl;
 650
 651                 memset(&fl, 0, sizeof(fl));
 652                 fl.proto = sk->sk_protocol;
 653                 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 654                 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
 655                 fl.fl6_flowlabel = np->flow_label;
 656                 fl.oif = sk->sk_bound_dev_if;
 657                 fl.fl_ip_dport = inet->dport;
 658                 fl.fl_ip_sport = inet->sport;
 659                 security_sk_classify_flow(sk, &fl);
 660
 661                 if (np->opt && np->opt->srcrt) {
 662                         struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
 663                         ipv6_addr_copy(&final, &fl.fl6_dst);
 664                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 665                         final_p = &final;
 666                 }
 667
 668                 err = ip6_dst_lookup(sk, &dst, &fl);
 669                 if (err) {
 670                         sk->sk_route_caps = 0;
 671                         return err;
 672                 }
 673                 if (final_p)
 674                         ipv6_addr_copy(&fl.fl6_dst, final_p);
 675
 676                 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
 677                         sk->sk_err_soft = -err;
 678                         return err;
 679                 }
 680
 681                 __ip6_dst_store(sk, dst, NULL, NULL);
 682         }
 683
 684         return 0;
 685 }
 686
 687 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
 688
 689 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
 690 {
 691         struct ipv6_pinfo *np = inet6_sk(sk);
 692         struct inet6_skb_parm *opt = IP6CB(skb);
 693
 694         if (np->rxopt.all) {
 695                 if ((opt->hop && (np->rxopt.bits.hopopts ||
 696                                   np->rxopt.bits.ohopopts)) ||
 697                     ((IPV6_FLOWINFO_MASK &
 698                       *(__be32 *)skb_network_header(skb)) &&
 699                      np->rxopt.bits.rxflow) ||
 700                     (opt->srcrt && (np->rxopt.bits.srcrt ||
 701                      np->rxopt.bits.osrcrt)) ||
 702                     ((opt->dst1 || opt->dst0) &&
 703                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
 704                         return 1;
 705         }
 706         return 0;
 707 }
 708
 709 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
 710
 711 static int __init init_ipv6_mibs(void)
 712 {
 713         if (snmp_mib_init((void **)ipv6_statistics, sizeof (struct ipstats_mib),
 714                           __alignof__(struct ipstats_mib)) < 0)
 715                 goto err_ip_mib;
 716         if (snmp_mib_init((void **)icmpv6_statistics, sizeof (struct icmpv6_mib),
 717                           __alignof__(struct icmpv6_mib)) < 0)
 718                 goto err_icmp_mib;
 719         if (snmp_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib),
 720                           __alignof__(struct udp_mib)) < 0)
 721                 goto err_udp_mib;
 722         if (snmp_mib_init((void **)udplite_stats_in6, sizeof (struct udp_mib),
 723                           __alignof__(struct udp_mib)) < 0)
 724                 goto err_udplite_mib;
 725         return 0;
 726
 727 err_udplite_mib:
 728         snmp_mib_free((void **)udp_stats_in6);
 729 err_udp_mib:
 730         snmp_mib_free((void **)icmpv6_statistics);
 731 err_icmp_mib:
 732         snmp_mib_free((void **)ipv6_statistics);
 733 err_ip_mib:
 734         return -ENOMEM;
 735
 736 }
 737
 738 static void cleanup_ipv6_mibs(void)
 739 {
 740         snmp_mib_free((void **)ipv6_statistics);
 741         snmp_mib_free((void **)icmpv6_statistics);
 742         snmp_mib_free((void **)udp_stats_in6);
 743         snmp_mib_free((void **)udplite_stats_in6);
 744 }
 745
 746 static int __init inet6_init(void)
 747 {
 748         struct sk_buff *dummy_skb;
 749         struct list_head *r;
 750         int err;
 751
 752         BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
 753
 754 #ifdef MODULE
 755 #if 0 /* FIXME --RR */
 756         if (!mod_member_present(&__this_module, can_unload))
 757           return -EINVAL;
 758
 759         __this_module.can_unload = &ipv6_unload;
 760 #endif
 761 #endif
 762
 763         err = proto_register(&tcpv6_prot, 1);
 764         if (err)
 765                 goto out;
 766
 767         err = proto_register(&udpv6_prot, 1);
 768         if (err)
 769                 goto out_unregister_tcp_proto;
 770
 771         err = proto_register(&udplitev6_prot, 1);
 772         if (err)
 773                 goto out_unregister_udp_proto;
 774
 775         err = proto_register(&rawv6_prot, 1);
 776         if (err)
 777                 goto out_unregister_udplite_proto;
 778
 779
 780         /* Register the socket-side information for inet6_create.  */
 781         for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
 782                 INIT_LIST_HEAD(r);
 783
 784         /* We MUST register RAW sockets before we create the ICMP6,
 785          * IGMP6, or NDISC control sockets.
 786          */
 787         inet6_register_protosw(&rawv6_protosw);
 788
 789         /* Register the family here so that the init calls below will
 790          * be able to create sockets. (?? is this dangerous ??)
 791          */
 792         err = sock_register(&inet6_family_ops);
 793         if (err)
 794                 goto out_unregister_raw_proto;
 795
 796         /* Initialise ipv6 mibs */
 797         err = init_ipv6_mibs();
 798         if (err)
 799                 goto out_unregister_sock;
 800
 801         /*
 802          *      ipngwg API draft makes clear that the correct semantics
 803          *      for TCP and UDP is to consider one TCP and UDP instance
 804          *      in a host availiable by both INET and INET6 APIs and
 805          *      able to communicate via both network protocols.
 806          */
 807
 808 #ifdef CONFIG_SYSCTL
 809         ipv6_sysctl_register();
 810 #endif
 811         err = icmpv6_init(&inet6_family_ops);
 812         if (err)
 813                 goto icmp_fail;
 814         err = ndisc_init(&inet6_family_ops);
 815         if (err)
 816                 goto ndisc_fail;
 817         err = igmp6_init(&inet6_family_ops);
 818         if (err)
 819                 goto igmp_fail;
 820         err = ipv6_netfilter_init();
 821         if (err)
 822                 goto netfilter_fail;
 823         /* Create /proc/foo6 entries. */
 824 #ifdef CONFIG_PROC_FS
 825         err = -ENOMEM;
 826         if (raw6_proc_init())
 827                 goto proc_raw6_fail;
 828         if (tcp6_proc_init())
 829                 goto proc_tcp6_fail;
 830         if (udp6_proc_init())
 831                 goto proc_udp6_fail;
 832         if (udplite6_proc_init())
 833                 goto proc_udplite6_fail;
 834         if (ipv6_misc_proc_init())
 835                 goto proc_misc6_fail;
 836
 837         if (ac6_proc_init())
 838                 goto proc_anycast6_fail;
 839         if (if6_proc_init())
 840                 goto proc_if6_fail;
 841 #endif
 842         ip6_route_init();
 843         ip6_flowlabel_init();
 844         err = addrconf_init();
 845         if (err)
 846                 goto addrconf_fail;
 847
 848         /* Init v6 extension headers. */
 849         ipv6_rthdr_init();
 850         ipv6_frag_init();
 851         ipv6_nodata_init();
 852         ipv6_destopt_init();
 853
 854         /* Init v6 transport protocols. */
 855         udpv6_init();
 856         udplitev6_init();
 857         tcpv6_init();
 858
 859         ipv6_packet_init();
 860         err = 0;
 861 out:
 862         return err;
 863
 864 addrconf_fail:
 865         ip6_flowlabel_cleanup();
 866         ip6_route_cleanup();
 867 #ifdef CONFIG_PROC_FS
 868         if6_proc_exit();
 869 proc_if6_fail:
 870         ac6_proc_exit();
 871 proc_anycast6_fail:
 872         ipv6_misc_proc_exit();
 873 proc_misc6_fail:
 874         udplite6_proc_exit();
 875 proc_udplite6_fail:
 876         udp6_proc_exit();
 877 proc_udp6_fail:
 878         tcp6_proc_exit();
 879 proc_tcp6_fail:
 880         raw6_proc_exit();
 881 proc_raw6_fail:
 882 #endif
 883         ipv6_netfilter_fini();
 884 netfilter_fail:
 885         igmp6_cleanup();
 886 igmp_fail:
 887         ndisc_cleanup();
 888 ndisc_fail:
 889         icmpv6_cleanup();
 890 icmp_fail:
 891 #ifdef CONFIG_SYSCTL
 892         ipv6_sysctl_unregister();
 893 #endif
 894         cleanup_ipv6_mibs();
 895 out_unregister_sock:
 896         sock_unregister(PF_INET6);
 897 out_unregister_raw_proto:
 898         proto_unregister(&rawv6_prot);
 899 out_unregister_udplite_proto:
 900         proto_unregister(&udplitev6_prot);
 901 out_unregister_udp_proto:
 902         proto_unregister(&udpv6_prot);
 903 out_unregister_tcp_proto:
 904         proto_unregister(&tcpv6_prot);
 905         goto out;
 906 }
 907 module_init(inet6_init);
 908
 909 static void __exit inet6_exit(void)
 910 {
 911         /* First of all disallow new sockets creation. */
 912         sock_unregister(PF_INET6);
 913         /* Disallow any further netlink messages */
 914         rtnl_unregister_all(PF_INET6);
 915
 916         /* Cleanup code parts. */
 917         ipv6_packet_cleanup();
 918
 919         addrconf_cleanup();
 920         ip6_flowlabel_cleanup();
 921         ip6_route_cleanup();
 922 #ifdef CONFIG_PROC_FS
 923
 924         /* Cleanup code parts. */
 925         if6_proc_exit();
 926         ac6_proc_exit();
 927         ipv6_misc_proc_exit();
 928         udplite6_proc_exit();
 929         udp6_proc_exit();
 930         tcp6_proc_exit();
 931         raw6_proc_exit();
 932 #endif
 933         ipv6_netfilter_fini();
 934         igmp6_cleanup();
 935         ndisc_cleanup();
 936         icmpv6_cleanup();
 937 #ifdef CONFIG_SYSCTL
 938         ipv6_sysctl_unregister();
 939 #endif
 940         cleanup_ipv6_mibs();
 941         proto_unregister(&rawv6_prot);
 942         proto_unregister(&udplitev6_prot);
 943         proto_unregister(&udpv6_prot);
 944         proto_unregister(&tcpv6_prot);
 945 }
 946 module_exit(inet6_exit);
 947
 948 MODULE_ALIAS_NETPROTO(PF_INET6);