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/config.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/sched.h>
  32 #include <linux/timer.h>
  33 #include <linux/string.h>
  34 #include <linux/sockios.h>
  35 #include <linux/net.h>
  36 #include <linux/fcntl.h>
  37 #include <linux/mm.h>
  38 #include <linux/interrupt.h>
  39 #include <linux/proc_fs.h>
  40 #include <linux/stat.h>
  41 #include <linux/init.h>
  42
  43 #include <linux/inet.h>
  44 #include <linux/netdevice.h>
  45 #include <linux/icmpv6.h>
  46 #include <linux/smp_lock.h>
  47 #include <linux/netfilter_ipv6.h>
  48
  49 #include <net/ip.h>
  50 #include <net/ipv6.h>
  51 #include <net/udp.h>
  52 #include <net/tcp.h>
  53 #include <net/ipip.h>
  54 #include <net/protocol.h>
  55 #include <net/inet_common.h>
  56 #include <net/transp_v6.h>
  57 #include <net/ip6_route.h>
  58 #include <net/addrconf.h>
  59 #ifdef CONFIG_IPV6_TUNNEL
  60 #include <net/ip6_tunnel.h>
  61 #endif
  62
  63 #include <asm/uaccess.h>
  64 #include <asm/system.h>
  65
  66 MODULE_AUTHOR("Cast of dozens");
  67 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
  68 MODULE_LICENSE("GPL");
  69
  70 int sysctl_ipv6_bindv6only;
  71
  72 /* The inetsw table contains everything that inet_create needs to
  73  * build a new socket.
  74  */
  75 static struct list_head inetsw6[SOCK_MAX];
  76 static DEFINE_SPINLOCK(inetsw6_lock);
  77
  78 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
  79 {
  80         const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
  81
  82         return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
  83 }
  84
  85 static int inet6_create(struct socket *sock, int protocol)
  86 {
  87         struct inet_sock *inet;
  88         struct ipv6_pinfo *np;
  89         struct sock *sk;
  90         struct list_head *p;
  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         /* Look for the requested type/protocol pair. */
  99         answer = NULL;
 100 lookup_protocol:
 101         err = -ESOCKTNOSUPPORT;
 102         rcu_read_lock();
 103         list_for_each_rcu(p, &inetsw6[sock->type]) {
 104                 answer = list_entry(p, struct inet_protosw, list);
 105
 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                 answer = NULL;
 121         }
 122
 123         if (!answer) {
 124                 if (try_loading_module < 2) {
 125                         rcu_read_unlock();
 126                         /*
 127                          * Be more specific, e.g. net-pf-10-proto-132-type-1
 128                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
 129                          */
 130                         if (++try_loading_module == 1)
 131                                 request_module("net-pf-%d-proto-%d-type-%d",
 132                                                 PF_INET6, protocol, sock->type);
 133                         /*
 134                          * Fall back to generic, e.g. net-pf-10-proto-132
 135                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
 136                          */
 137                         else
 138                                 request_module("net-pf-%d-proto-%d",
 139                                                 PF_INET6, protocol);
 140                         goto lookup_protocol;
 141                 } else
 142                         goto out_rcu_unlock;
 143         }
 144
 145         err = -EPERM;
 146         if (answer->capability > 0 && !capable(answer->capability))
 147                 goto out_rcu_unlock;
 148
 149         sock->ops = answer->ops;
 150         answer_prot = answer->prot;
 151         answer_no_check = answer->no_check;
 152         answer_flags = answer->flags;
 153         rcu_read_unlock();
 154
 155         BUG_TRAP(answer_prot->slab != NULL);
 156
 157         err = -ENOBUFS;
 158         sk = sk_alloc(PF_INET6, GFP_KERNEL, answer_prot, 1);
 159         if (sk == NULL)
 160                 goto out;
 161
 162         sock_init_data(sock, sk);
 163
 164         err = 0;
 165         sk->sk_no_check = answer_no_check;
 166         if (INET_PROTOSW_REUSE & answer_flags)
 167                 sk->sk_reuse = 1;
 168
 169         inet = inet_sk(sk);
 170         inet->is_icsk = INET_PROTOSW_ICSK & answer_flags;
 171
 172         if (SOCK_RAW == sock->type) {
 173                 inet->num = protocol;
 174                 if (IPPROTO_RAW == protocol)
 175                         inet->hdrincl = 1;
 176         }
 177
 178         sk->sk_destruct         = inet_sock_destruct;
 179         sk->sk_family           = PF_INET6;
 180         sk->sk_protocol         = protocol;
 181
 182         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
 183
 184         inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
 185         np->hop_limit   = -1;
 186         np->mcast_hops  = -1;
 187         np->mc_loop     = 1;
 188         np->pmtudisc    = IPV6_PMTUDISC_WANT;
 189         np->ipv6only    = sysctl_ipv6_bindv6only;
 190
 191         /* Init the ipv4 part of the socket since we can have sockets
 192          * using v6 API for ipv4.
 193          */
 194         inet->uc_ttl    = -1;
 195
 196         inet->mc_loop   = 1;
 197         inet->mc_ttl    = 1;
 198         inet->mc_index  = 0;
 199         inet->mc_list   = NULL;
 200
 201         if (ipv4_config.no_pmtu_disc)
 202                 inet->pmtudisc = IP_PMTUDISC_DONT;
 203         else
 204                 inet->pmtudisc = IP_PMTUDISC_WANT;
 205         /*
 206          * Increment only the relevant sk_prot->socks debug field, this changes
 207          * the previous behaviour of incrementing both the equivalent to
 208          * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
 209          *
 210          * This allows better debug granularity as we'll know exactly how many
 211          * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
 212          * transport protocol socks. -acme
 213          */
 214         sk_refcnt_debug_inc(sk);
 215
 216         if (inet->num) {
 217                 /* It assumes that any protocol which allows
 218                  * the user to assign a number at socket
 219                  * creation time automatically shares.
 220                  */
 221                 inet->sport = ntohs(inet->num);
 222                 sk->sk_prot->hash(sk);
 223         }
 224         if (sk->sk_prot->init) {
 225                 err = sk->sk_prot->init(sk);
 226                 if (err) {
 227                         sk_common_release(sk);
 228                         goto out;
 229                 }
 230         }
 231 out:
 232         return err;
 233 out_rcu_unlock:
 234         rcu_read_unlock();
 235         goto out;
 236 }
 237
 238
 239 /* bind for INET6 API */
 240 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 241 {
 242         struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
 243         struct sock *sk = sock->sk;
 244         struct inet_sock *inet = inet_sk(sk);
 245         struct ipv6_pinfo *np = inet6_sk(sk);
 246         __u32 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(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(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(&addr->sin6_addr, dev, 0)) {
 311                                         if (dev)
 312                                                 dev_put(dev);
 313                                         err = -EADDRNOTAVAIL;
 314                                         goto out;
 315                                 }
 316                         }
 317                         if (dev)
 318                                 dev_put(dev);
 319                 }
 320         }
 321
 322         inet->rcv_saddr = v4addr;
 323         inet->saddr = v4addr;
 324
 325         ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
 326
 327         if (!(addr_type & IPV6_ADDR_MULTICAST))
 328                 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
 329
 330         /* Make sure we are allowed to bind here. */
 331         if (sk->sk_prot->get_port(sk, snum)) {
 332                 inet_reset_saddr(sk);
 333                 err = -EADDRINUSE;
 334                 goto out;
 335         }
 336
 337         if (addr_type != IPV6_ADDR_ANY)
 338                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
 339         if (snum)
 340                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
 341         inet->sport = ntohs(inet->num);
 342         inet->dport = 0;
 343         inet->daddr = 0;
 344 out:
 345         release_sock(sk);
 346         return err;
 347 }
 348
 349 int inet6_release(struct socket *sock)
 350 {
 351         struct sock *sk = sock->sk;
 352
 353         if (sk == NULL)
 354                 return -EINVAL;
 355
 356         /* Free mc lists */
 357         ipv6_sock_mc_close(sk);
 358
 359         /* Free ac lists */
 360         ipv6_sock_ac_close(sk);
 361
 362         return inet_release(sock);
 363 }
 364
 365 int inet6_destroy_sock(struct sock *sk)
 366 {
 367         struct ipv6_pinfo *np = inet6_sk(sk);
 368         struct sk_buff *skb;
 369         struct ipv6_txoptions *opt;
 370
 371         /*
 372          *      Release destination entry
 373          */
 374
 375         sk_dst_reset(sk);
 376
 377         /* Release rx options */
 378
 379         if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
 380                 kfree_skb(skb);
 381
 382         /* Free flowlabels */
 383         fl6_free_socklist(sk);
 384
 385         /* Free tx options */
 386
 387         if ((opt = xchg(&np->opt, NULL)) != NULL)
 388                 sock_kfree_s(sk, opt, opt->tot_len);
 389
 390         return 0;
 391 }
 392
 393 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
 394
 395 /*
 396  *      This does both peername and sockname.
 397  */
 398
 399 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 400                  int *uaddr_len, int peer)
 401 {
 402         struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
 403         struct sock *sk = sock->sk;
 404         struct inet_sock *inet = inet_sk(sk);
 405         struct ipv6_pinfo *np = inet6_sk(sk);
 406
 407         sin->sin6_family = AF_INET6;
 408         sin->sin6_flowinfo = 0;
 409         sin->sin6_scope_id = 0;
 410         if (peer) {
 411                 if (!inet->dport)
 412                         return -ENOTCONN;
 413                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
 414                     peer == 1)
 415                         return -ENOTCONN;
 416                 sin->sin6_port = inet->dport;
 417                 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
 418                 if (np->sndflow)
 419                         sin->sin6_flowinfo = np->flow_label;
 420         } else {
 421                 if (ipv6_addr_any(&np->rcv_saddr))
 422                         ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
 423                 else
 424                         ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
 425
 426                 sin->sin6_port = inet->sport;
 427         }
 428         if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
 429                 sin->sin6_scope_id = sk->sk_bound_dev_if;
 430         *uaddr_len = sizeof(*sin);
 431         return(0);
 432 }
 433
 434 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 435 {
 436         struct sock *sk = sock->sk;
 437
 438         switch(cmd)
 439         {
 440         case SIOCGSTAMP:
 441                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
 442
 443         case SIOCADDRT:
 444         case SIOCDELRT:
 445
 446                 return(ipv6_route_ioctl(cmd,(void __user *)arg));
 447
 448         case SIOCSIFADDR:
 449                 return addrconf_add_ifaddr((void __user *) arg);
 450         case SIOCDIFADDR:
 451                 return addrconf_del_ifaddr((void __user *) arg);
 452         case SIOCSIFDSTADDR:
 453                 return addrconf_set_dstaddr((void __user *) arg);
 454         default:
 455                 if (!sk->sk_prot->ioctl)
 456                         return -ENOIOCTLCMD;
 457                 return sk->sk_prot->ioctl(sk, cmd, arg);
 458         }
 459         /*NOTREACHED*/
 460         return(0);
 461 }
 462
 463 const struct proto_ops inet6_stream_ops = {
 464         .family =       PF_INET6,
 465         .owner =        THIS_MODULE,
 466         .release =      inet6_release,
 467         .bind =         inet6_bind,
 468         .connect =      inet_stream_connect,            /* ok           */
 469         .socketpair =   sock_no_socketpair,             /* a do nothing */
 470         .accept =       inet_accept,                    /* ok           */
 471         .getname =      inet6_getname,
 472         .poll =         tcp_poll,                       /* ok           */
 473         .ioctl =        inet6_ioctl,                    /* must change  */
 474         .listen =       inet_listen,                    /* ok           */
 475         .shutdown =     inet_shutdown,                  /* ok           */
 476         .setsockopt =   sock_common_setsockopt,         /* ok           */
 477         .getsockopt =   sock_common_getsockopt,         /* ok           */
 478         .sendmsg =      inet_sendmsg,                   /* ok           */
 479         .recvmsg =      sock_common_recvmsg,            /* ok           */
 480         .mmap =         sock_no_mmap,
 481         .sendpage =     tcp_sendpage
 482 };
 483
 484 const struct proto_ops inet6_dgram_ops = {
 485         .family =       PF_INET6,
 486         .owner =        THIS_MODULE,
 487         .release =      inet6_release,
 488         .bind =         inet6_bind,
 489         .connect =      inet_dgram_connect,             /* ok           */
 490         .socketpair =   sock_no_socketpair,             /* a do nothing */
 491         .accept =       sock_no_accept,                 /* a do nothing */
 492         .getname =      inet6_getname,
 493         .poll =         udp_poll,                       /* ok           */
 494         .ioctl =        inet6_ioctl,                    /* must change  */
 495         .listen =       sock_no_listen,                 /* ok           */
 496         .shutdown =     inet_shutdown,                  /* ok           */
 497         .setsockopt =   sock_common_setsockopt,         /* ok           */
 498         .getsockopt =   sock_common_getsockopt,         /* ok           */
 499         .sendmsg =      inet_sendmsg,                   /* ok           */
 500         .recvmsg =      sock_common_recvmsg,            /* ok           */
 501         .mmap =         sock_no_mmap,
 502         .sendpage =     sock_no_sendpage,
 503 };
 504
 505 static struct net_proto_family inet6_family_ops = {
 506         .family = PF_INET6,
 507         .create = inet6_create,
 508         .owner  = THIS_MODULE,
 509 };
 510
 511 /* Same as inet6_dgram_ops, sans udp_poll.  */
 512 static const struct proto_ops inet6_sockraw_ops = {
 513         .family =       PF_INET6,
 514         .owner =        THIS_MODULE,
 515         .release =      inet6_release,
 516         .bind =         inet6_bind,
 517         .connect =      inet_dgram_connect,             /* ok           */
 518         .socketpair =   sock_no_socketpair,             /* a do nothing */
 519         .accept =       sock_no_accept,                 /* a do nothing */
 520         .getname =      inet6_getname,
 521         .poll =         datagram_poll,                  /* ok           */
 522         .ioctl =        inet6_ioctl,                    /* must change  */
 523         .listen =       sock_no_listen,                 /* ok           */
 524         .shutdown =     inet_shutdown,                  /* ok           */
 525         .setsockopt =   sock_common_setsockopt,         /* ok           */
 526         .getsockopt =   sock_common_getsockopt,         /* ok           */
 527         .sendmsg =      inet_sendmsg,                   /* ok           */
 528         .recvmsg =      sock_common_recvmsg,            /* ok           */
 529         .mmap =         sock_no_mmap,
 530         .sendpage =     sock_no_sendpage,
 531 };
 532
 533 static struct inet_protosw rawv6_protosw = {
 534         .type           = SOCK_RAW,
 535         .protocol       = IPPROTO_IP,   /* wild card */
 536         .prot           = &rawv6_prot,
 537         .ops            = &inet6_sockraw_ops,
 538         .capability     = CAP_NET_RAW,
 539         .no_check       = UDP_CSUM_DEFAULT,
 540         .flags          = INET_PROTOSW_REUSE,
 541 };
 542
 543 void
 544 inet6_register_protosw(struct inet_protosw *p)
 545 {
 546         struct list_head *lh;
 547         struct inet_protosw *answer;
 548         int protocol = p->protocol;
 549         struct list_head *last_perm;
 550
 551         spin_lock_bh(&inetsw6_lock);
 552
 553         if (p->type >= SOCK_MAX)
 554                 goto out_illegal;
 555
 556         /* If we are trying to override a permanent protocol, bail. */
 557         answer = NULL;
 558         last_perm = &inetsw6[p->type];
 559         list_for_each(lh, &inetsw6[p->type]) {
 560                 answer = list_entry(lh, struct inet_protosw, list);
 561
 562                 /* Check only the non-wild match. */
 563                 if (INET_PROTOSW_PERMANENT & answer->flags) {
 564                         if (protocol == answer->protocol)
 565                                 break;
 566                         last_perm = lh;
 567                 }
 568
 569                 answer = NULL;
 570         }
 571         if (answer)
 572                 goto out_permanent;
 573
 574         /* Add the new entry after the last permanent entry if any, so that
 575          * the new entry does not override a permanent entry when matched with
 576          * a wild-card protocol. But it is allowed to override any existing
 577          * non-permanent entry.  This means that when we remove this entry, the
 578          * system automatically returns to the old behavior.
 579          */
 580         list_add_rcu(&p->list, last_perm);
 581 out:
 582         spin_unlock_bh(&inetsw6_lock);
 583         return;
 584
 585 out_permanent:
 586         printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
 587                protocol);
 588         goto out;
 589
 590 out_illegal:
 591         printk(KERN_ERR
 592                "Ignoring attempt to register invalid socket type %d.\n",
 593                p->type);
 594         goto out;
 595 }
 596
 597 void
 598 inet6_unregister_protosw(struct inet_protosw *p)
 599 {
 600         if (INET_PROTOSW_PERMANENT & p->flags) {
 601                 printk(KERN_ERR
 602                        "Attempt to unregister permanent protocol %d.\n",
 603                        p->protocol);
 604         } else {
 605                 spin_lock_bh(&inetsw6_lock);
 606                 list_del_rcu(&p->list);
 607                 spin_unlock_bh(&inetsw6_lock);
 608
 609                 synchronize_net();
 610         }
 611 }
 612
 613 int inet6_sk_rebuild_header(struct sock *sk)
 614 {
 615         int err;
 616         struct dst_entry *dst;
 617         struct ipv6_pinfo *np = inet6_sk(sk);
 618
 619         dst = __sk_dst_check(sk, np->dst_cookie);
 620
 621         if (dst == NULL) {
 622                 struct inet_sock *inet = inet_sk(sk);
 623                 struct in6_addr *final_p = NULL, final;
 624                 struct flowi fl;
 625
 626                 memset(&fl, 0, sizeof(fl));
 627                 fl.proto = sk->sk_protocol;
 628                 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 629                 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
 630                 fl.fl6_flowlabel = np->flow_label;
 631                 fl.oif = sk->sk_bound_dev_if;
 632                 fl.fl_ip_dport = inet->dport;
 633                 fl.fl_ip_sport = inet->sport;
 634
 635                 if (np->opt && np->opt->srcrt) {
 636                         struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
 637                         ipv6_addr_copy(&final, &fl.fl6_dst);
 638                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 639                         final_p = &final;
 640                 }
 641
 642                 err = ip6_dst_lookup(sk, &dst, &fl);
 643                 if (err) {
 644                         sk->sk_route_caps = 0;
 645                         return err;
 646                 }
 647                 if (final_p)
 648                         ipv6_addr_copy(&fl.fl6_dst, final_p);
 649
 650                 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
 651                         sk->sk_err_soft = -err;
 652                         return err;
 653                 }
 654
 655                 ip6_dst_store(sk, dst, NULL);
 656                 sk->sk_route_caps = dst->dev->features &
 657                         ~(NETIF_F_IP_CSUM | NETIF_F_TSO);
 658         }
 659
 660         return 0;
 661 }
 662
 663 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
 664
 665 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
 666 {
 667         struct ipv6_pinfo *np = inet6_sk(sk);
 668         struct inet6_skb_parm *opt = IP6CB(skb);
 669
 670         if (np->rxopt.all) {
 671                 if ((opt->hop && (np->rxopt.bits.hopopts ||
 672                                   np->rxopt.bits.ohopopts)) ||
 673                     ((IPV6_FLOWINFO_MASK & *(u32*)skb->nh.raw) &&
 674                      np->rxopt.bits.rxflow) ||
 675                     (opt->srcrt && (np->rxopt.bits.srcrt ||
 676                      np->rxopt.bits.osrcrt)) ||
 677                     ((opt->dst1 || opt->dst0) &&
 678                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
 679                         return 1;
 680         }
 681         return 0;
 682 }
 683
 684 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
 685
 686 int
 687 snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign)
 688 {
 689         if (ptr == NULL)
 690                 return -EINVAL;
 691
 692         ptr[0] = __alloc_percpu(mibsize, mibalign);
 693         if (!ptr[0])
 694                 goto err0;
 695
 696         ptr[1] = __alloc_percpu(mibsize, mibalign);
 697         if (!ptr[1])
 698                 goto err1;
 699
 700         return 0;
 701
 702 err1:
 703         free_percpu(ptr[0]);
 704         ptr[0] = NULL;
 705 err0:
 706         return -ENOMEM;
 707 }
 708
 709 void
 710 snmp6_mib_free(void *ptr[2])
 711 {
 712         if (ptr == NULL)
 713                 return;
 714         if (ptr[0])
 715                 free_percpu(ptr[0]);
 716         if (ptr[1])
 717                 free_percpu(ptr[1]);
 718         ptr[0] = ptr[1] = NULL;
 719 }
 720
 721 static int __init init_ipv6_mibs(void)
 722 {
 723         if (snmp6_mib_init((void **)ipv6_statistics, sizeof (struct ipstats_mib),
 724                            __alignof__(struct ipstats_mib)) < 0)
 725                 goto err_ip_mib;
 726         if (snmp6_mib_init((void **)icmpv6_statistics, sizeof (struct icmpv6_mib),
 727                            __alignof__(struct icmpv6_mib)) < 0)
 728                 goto err_icmp_mib;
 729         if (snmp6_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib),
 730                            __alignof__(struct udp_mib)) < 0)
 731                 goto err_udp_mib;
 732         return 0;
 733
 734 err_udp_mib:
 735         snmp6_mib_free((void **)icmpv6_statistics);
 736 err_icmp_mib:
 737         snmp6_mib_free((void **)ipv6_statistics);
 738 err_ip_mib:
 739         return -ENOMEM;
 740
 741 }
 742
 743 static void cleanup_ipv6_mibs(void)
 744 {
 745         snmp6_mib_free((void **)ipv6_statistics);
 746         snmp6_mib_free((void **)icmpv6_statistics);
 747         snmp6_mib_free((void **)udp_stats_in6);
 748 }
 749
 750 static int __init inet6_init(void)
 751 {
 752         struct sk_buff *dummy_skb;
 753         struct list_head *r;
 754         int err;
 755
 756 #ifdef MODULE
 757 #if 0 /* FIXME --RR */
 758         if (!mod_member_present(&__this_module, can_unload))
 759           return -EINVAL;
 760
 761         __this_module.can_unload = &ipv6_unload;
 762 #endif
 763 #endif
 764
 765         if (sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb)) {
 766                 printk(KERN_CRIT "inet6_proto_init: size fault\n");
 767                 return -EINVAL;
 768         }
 769
 770         err = proto_register(&tcpv6_prot, 1);
 771         if (err)
 772                 goto out;
 773
 774         err = proto_register(&udpv6_prot, 1);
 775         if (err)
 776                 goto out_unregister_tcp_proto;
 777
 778         err = proto_register(&rawv6_prot, 1);
 779         if (err)
 780                 goto out_unregister_udp_proto;
 781
 782
 783         /* Register the socket-side information for inet6_create.  */
 784         for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
 785                 INIT_LIST_HEAD(r);
 786
 787         /* We MUST register RAW sockets before we create the ICMP6,
 788          * IGMP6, or NDISC control sockets.
 789          */
 790         inet6_register_protosw(&rawv6_protosw);
 791
 792         /* Register the family here so that the init calls below will
 793          * be able to create sockets. (?? is this dangerous ??)
 794          */
 795         err = sock_register(&inet6_family_ops);
 796         if (err)
 797                 goto out_unregister_raw_proto;
 798
 799         /* Initialise ipv6 mibs */
 800         err = init_ipv6_mibs();
 801         if (err)
 802                 goto out_unregister_sock;
 803
 804         /*
 805          *      ipngwg API draft makes clear that the correct semantics
 806          *      for TCP and UDP is to consider one TCP and UDP instance
 807          *      in a host availiable by both INET and INET6 APIs and
 808          *      able to communicate via both network protocols.
 809          */
 810
 811 #ifdef CONFIG_SYSCTL
 812         ipv6_sysctl_register();
 813 #endif
 814         err = icmpv6_init(&inet6_family_ops);
 815         if (err)
 816                 goto icmp_fail;
 817         err = ndisc_init(&inet6_family_ops);
 818         if (err)
 819                 goto ndisc_fail;
 820         err = igmp6_init(&inet6_family_ops);
 821         if (err)
 822                 goto igmp_fail;
 823         err = ipv6_netfilter_init();
 824         if (err)
 825                 goto netfilter_fail;
 826         /* Create /proc/foo6 entries. */
 827 #ifdef CONFIG_PROC_FS
 828         err = -ENOMEM;
 829         if (raw6_proc_init())
 830                 goto proc_raw6_fail;
 831         if (tcp6_proc_init())
 832                 goto proc_tcp6_fail;
 833         if (udp6_proc_init())
 834                 goto proc_udp6_fail;
 835         if (ipv6_misc_proc_init())
 836                 goto proc_misc6_fail;
 837
 838         if (ac6_proc_init())
 839                 goto proc_anycast6_fail;
 840         if (if6_proc_init())
 841                 goto proc_if6_fail;
 842 #endif
 843         ip6_route_init();
 844         ip6_flowlabel_init();
 845         err = addrconf_init();
 846         if (err)
 847                 goto addrconf_fail;
 848         sit_init();
 849
 850         /* Init v6 extension headers. */
 851         ipv6_rthdr_init();
 852         ipv6_frag_init();
 853         ipv6_nodata_init();
 854         ipv6_destopt_init();
 855
 856         /* Init v6 transport protocols. */
 857         udpv6_init();
 858         tcpv6_init();
 859
 860         ipv6_packet_init();
 861         err = 0;
 862 out:
 863         return err;
 864
 865 addrconf_fail:
 866         ip6_flowlabel_cleanup();
 867         ip6_route_cleanup();
 868 #ifdef CONFIG_PROC_FS
 869         if6_proc_exit();
 870 proc_if6_fail:
 871         ac6_proc_exit();
 872 proc_anycast6_fail:
 873         ipv6_misc_proc_exit();
 874 proc_misc6_fail:
 875         udp6_proc_exit();
 876 proc_udp6_fail:
 877         tcp6_proc_exit();
 878 proc_tcp6_fail:
 879         raw6_proc_exit();
 880 proc_raw6_fail:
 881 #endif
 882         ipv6_netfilter_fini();
 883 netfilter_fail:
 884         igmp6_cleanup();
 885 igmp_fail:
 886         ndisc_cleanup();
 887 ndisc_fail:
 888         icmpv6_cleanup();
 889 icmp_fail:
 890 #ifdef CONFIG_SYSCTL
 891         ipv6_sysctl_unregister();
 892 #endif
 893         cleanup_ipv6_mibs();
 894 out_unregister_sock:
 895         sock_unregister(PF_INET6);
 896 out_unregister_raw_proto:
 897         proto_unregister(&rawv6_prot);
 898 out_unregister_udp_proto:
 899         proto_unregister(&udpv6_prot);
 900 out_unregister_tcp_proto:
 901         proto_unregister(&tcpv6_prot);
 902         goto out;
 903 }
 904 module_init(inet6_init);
 905
 906 static void __exit inet6_exit(void)
 907 {
 908         /* First of all disallow new sockets creation. */
 909         sock_unregister(PF_INET6);
 910 #ifdef CONFIG_PROC_FS
 911         if6_proc_exit();
 912         ac6_proc_exit();
 913         ipv6_misc_proc_exit();
 914         udp6_proc_exit();
 915         tcp6_proc_exit();
 916         raw6_proc_exit();
 917 #endif
 918         /* Cleanup code parts. */
 919         sit_cleanup();
 920         ip6_flowlabel_cleanup();
 921         addrconf_cleanup();
 922         ip6_route_cleanup();
 923         ipv6_packet_cleanup();
 924         igmp6_cleanup();
 925         ipv6_netfilter_fini();
 926         ndisc_cleanup();
 927         icmpv6_cleanup();
 928 #ifdef CONFIG_SYSCTL
 929         ipv6_sysctl_unregister();
 930 #endif
 931         cleanup_ipv6_mibs();
 932         proto_unregister(&rawv6_prot);
 933         proto_unregister(&udpv6_prot);
 934         proto_unregister(&tcpv6_prot);
 935 }
 936 module_exit(inet6_exit);
 937
 938 MODULE_ALIAS_NETPROTO(PF_INET6);