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/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/udplite.h>
  53 #include <net/tcp.h>
  54 #include <net/ipip.h>
  55 #include <net/protocol.h>
  56 #include <net/inet_common.h>
  57 #include <net/transp_v6.h>
  58 #include <net/ip6_route.h>
  59 #include <net/addrconf.h>
  60 #ifdef CONFIG_IPV6_TUNNEL
  61 #include <net/ip6_tunnel.h>
  62 #endif
  63 #ifdef CONFIG_IPV6_MIP6
  64 #include <net/mip6.h>
  65 #endif
  66
  67 #include <asm/uaccess.h>
  68 #include <asm/system.h>
  69
  70 MODULE_AUTHOR("Cast of dozens");
  71 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
  72 MODULE_LICENSE("GPL");
  73
  74 int sysctl_ipv6_bindv6only __read_mostly;
  75
  76 /* The inetsw table contains everything that inet_create needs to
  77  * build a new socket.
  78  */
  79 static struct list_head inetsw6[SOCK_MAX];
  80 static DEFINE_SPINLOCK(inetsw6_lock);
  81
  82 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
  83 {
  84         const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
  85
  86         return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
  87 }
  88
  89 static int inet6_create(struct socket *sock, int protocol)
  90 {
  91         struct inet_sock *inet;
  92         struct ipv6_pinfo *np;
  93         struct sock *sk;
  94         struct list_head *p;
  95         struct inet_protosw *answer;
  96         struct proto *answer_prot;
  97         unsigned char answer_flags;
  98         char answer_no_check;
  99         int try_loading_module = 0;
 100         int err;
 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;
 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 int inet6_release(struct socket *sock)
 354 {
 355         struct sock *sk = sock->sk;
 356
 357         if (sk == NULL)
 358                 return -EINVAL;
 359
 360         /* Free mc lists */
 361         ipv6_sock_mc_close(sk);
 362
 363         /* Free ac lists */
 364         ipv6_sock_ac_close(sk);
 365
 366         return inet_release(sock);
 367 }
 368
 369 int inet6_destroy_sock(struct sock *sk)
 370 {
 371         struct ipv6_pinfo *np = inet6_sk(sk);
 372         struct sk_buff *skb;
 373         struct ipv6_txoptions *opt;
 374
 375         /* Release rx options */
 376
 377         if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
 378                 kfree_skb(skb);
 379
 380         /* Free flowlabels */
 381         fl6_free_socklist(sk);
 382
 383         /* Free tx options */
 384
 385         if ((opt = xchg(&np->opt, NULL)) != NULL)
 386                 sock_kfree_s(sk, opt, opt->tot_len);
 387
 388         return 0;
 389 }
 390
 391 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
 392
 393 /*
 394  *      This does both peername and sockname.
 395  */
 396
 397 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 398                  int *uaddr_len, int peer)
 399 {
 400         struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
 401         struct sock *sk = sock->sk;
 402         struct inet_sock *inet = inet_sk(sk);
 403         struct ipv6_pinfo *np = inet6_sk(sk);
 404
 405         sin->sin6_family = AF_INET6;
 406         sin->sin6_flowinfo = 0;
 407         sin->sin6_scope_id = 0;
 408         if (peer) {
 409                 if (!inet->dport)
 410                         return -ENOTCONN;
 411                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
 412                     peer == 1)
 413                         return -ENOTCONN;
 414                 sin->sin6_port = inet->dport;
 415                 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
 416                 if (np->sndflow)
 417                         sin->sin6_flowinfo = np->flow_label;
 418         } else {
 419                 if (ipv6_addr_any(&np->rcv_saddr))
 420                         ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
 421                 else
 422                         ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
 423
 424                 sin->sin6_port = inet->sport;
 425         }
 426         if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
 427                 sin->sin6_scope_id = sk->sk_bound_dev_if;
 428         *uaddr_len = sizeof(*sin);
 429         return(0);
 430 }
 431
 432 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 433 {
 434         struct sock *sk = sock->sk;
 435
 436         switch(cmd)
 437         {
 438         case SIOCGSTAMP:
 439                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
 440
 441         case SIOCADDRT:
 442         case SIOCDELRT:
 443
 444                 return(ipv6_route_ioctl(cmd,(void __user *)arg));
 445
 446         case SIOCSIFADDR:
 447                 return addrconf_add_ifaddr((void __user *) arg);
 448         case SIOCDIFADDR:
 449                 return addrconf_del_ifaddr((void __user *) arg);
 450         case SIOCSIFDSTADDR:
 451                 return addrconf_set_dstaddr((void __user *) arg);
 452         default:
 453                 if (!sk->sk_prot->ioctl)
 454                         return -ENOIOCTLCMD;
 455                 return sk->sk_prot->ioctl(sk, cmd, arg);
 456         }
 457         /*NOTREACHED*/
 458         return(0);
 459 }
 460
 461 const struct proto_ops inet6_stream_ops = {
 462         .family            = PF_INET6,
 463         .owner             = THIS_MODULE,
 464         .release           = inet6_release,
 465         .bind              = inet6_bind,
 466         .connect           = inet_stream_connect,       /* ok           */
 467         .socketpair        = sock_no_socketpair,        /* a do nothing */
 468         .accept            = inet_accept,               /* ok           */
 469         .getname           = inet6_getname,
 470         .poll              = tcp_poll,                  /* ok           */
 471         .ioctl             = inet6_ioctl,               /* must change  */
 472         .listen            = inet_listen,               /* ok           */
 473         .shutdown          = inet_shutdown,             /* ok           */
 474         .setsockopt        = sock_common_setsockopt,    /* ok           */
 475         .getsockopt        = sock_common_getsockopt,    /* ok           */
 476         .sendmsg           = inet_sendmsg,              /* ok           */
 477         .recvmsg           = sock_common_recvmsg,       /* ok           */
 478         .mmap              = sock_no_mmap,
 479         .sendpage          = tcp_sendpage,
 480 #ifdef CONFIG_COMPAT
 481         .compat_setsockopt = compat_sock_common_setsockopt,
 482         .compat_getsockopt = compat_sock_common_getsockopt,
 483 #endif
 484 };
 485
 486 const struct proto_ops inet6_dgram_ops = {
 487         .family            = PF_INET6,
 488         .owner             = THIS_MODULE,
 489         .release           = inet6_release,
 490         .bind              = inet6_bind,
 491         .connect           = inet_dgram_connect,        /* ok           */
 492         .socketpair        = sock_no_socketpair,        /* a do nothing */
 493         .accept            = sock_no_accept,            /* a do nothing */
 494         .getname           = inet6_getname,
 495         .poll              = udp_poll,                  /* ok           */
 496         .ioctl             = inet6_ioctl,               /* must change  */
 497         .listen            = sock_no_listen,            /* ok           */
 498         .shutdown          = inet_shutdown,             /* ok           */
 499         .setsockopt        = sock_common_setsockopt,    /* ok           */
 500         .getsockopt        = sock_common_getsockopt,    /* ok           */
 501         .sendmsg           = inet_sendmsg,              /* ok           */
 502         .recvmsg           = sock_common_recvmsg,       /* ok           */
 503         .mmap              = sock_no_mmap,
 504         .sendpage          = sock_no_sendpage,
 505 #ifdef CONFIG_COMPAT
 506         .compat_setsockopt = compat_sock_common_setsockopt,
 507         .compat_getsockopt = compat_sock_common_getsockopt,
 508 #endif
 509 };
 510
 511 static struct net_proto_family inet6_family_ops = {
 512         .family = PF_INET6,
 513         .create = inet6_create,
 514         .owner  = THIS_MODULE,
 515 };
 516
 517 /* Same as inet6_dgram_ops, sans udp_poll.  */
 518 static const struct proto_ops inet6_sockraw_ops = {
 519         .family            = PF_INET6,
 520         .owner             = THIS_MODULE,
 521         .release           = inet6_release,
 522         .bind              = inet6_bind,
 523         .connect           = inet_dgram_connect,        /* ok           */
 524         .socketpair        = sock_no_socketpair,        /* a do nothing */
 525         .accept            = sock_no_accept,            /* a do nothing */
 526         .getname           = inet6_getname,
 527         .poll              = datagram_poll,             /* ok           */
 528         .ioctl             = inet6_ioctl,               /* must change  */
 529         .listen            = sock_no_listen,            /* ok           */
 530         .shutdown          = inet_shutdown,             /* ok           */
 531         .setsockopt        = sock_common_setsockopt,    /* ok           */
 532         .getsockopt        = sock_common_getsockopt,    /* ok           */
 533         .sendmsg           = inet_sendmsg,              /* ok           */
 534         .recvmsg           = sock_common_recvmsg,       /* ok           */
 535         .mmap              = sock_no_mmap,
 536         .sendpage          = sock_no_sendpage,
 537 #ifdef CONFIG_COMPAT
 538         .compat_setsockopt = compat_sock_common_setsockopt,
 539         .compat_getsockopt = compat_sock_common_getsockopt,
 540 #endif
 541 };
 542
 543 static struct inet_protosw rawv6_protosw = {
 544         .type           = SOCK_RAW,
 545         .protocol       = IPPROTO_IP,   /* wild card */
 546         .prot           = &rawv6_prot,
 547         .ops            = &inet6_sockraw_ops,
 548         .capability     = CAP_NET_RAW,
 549         .no_check       = UDP_CSUM_DEFAULT,
 550         .flags          = INET_PROTOSW_REUSE,
 551 };
 552
 553 void
 554 inet6_register_protosw(struct inet_protosw *p)
 555 {
 556         struct list_head *lh;
 557         struct inet_protosw *answer;
 558         int protocol = p->protocol;
 559         struct list_head *last_perm;
 560
 561         spin_lock_bh(&inetsw6_lock);
 562
 563         if (p->type >= SOCK_MAX)
 564                 goto out_illegal;
 565
 566         /* If we are trying to override a permanent protocol, bail. */
 567         answer = NULL;
 568         last_perm = &inetsw6[p->type];
 569         list_for_each(lh, &inetsw6[p->type]) {
 570                 answer = list_entry(lh, struct inet_protosw, list);
 571
 572                 /* Check only the non-wild match. */
 573                 if (INET_PROTOSW_PERMANENT & answer->flags) {
 574                         if (protocol == answer->protocol)
 575                                 break;
 576                         last_perm = lh;
 577                 }
 578
 579                 answer = NULL;
 580         }
 581         if (answer)
 582                 goto out_permanent;
 583
 584         /* Add the new entry after the last permanent entry if any, so that
 585          * the new entry does not override a permanent entry when matched with
 586          * a wild-card protocol. But it is allowed to override any existing
 587          * non-permanent entry.  This means that when we remove this entry, the
 588          * system automatically returns to the old behavior.
 589          */
 590         list_add_rcu(&p->list, last_perm);
 591 out:
 592         spin_unlock_bh(&inetsw6_lock);
 593         return;
 594
 595 out_permanent:
 596         printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
 597                protocol);
 598         goto out;
 599
 600 out_illegal:
 601         printk(KERN_ERR
 602                "Ignoring attempt to register invalid socket type %d.\n",
 603                p->type);
 604         goto out;
 605 }
 606
 607 void
 608 inet6_unregister_protosw(struct inet_protosw *p)
 609 {
 610         if (INET_PROTOSW_PERMANENT & p->flags) {
 611                 printk(KERN_ERR
 612                        "Attempt to unregister permanent protocol %d.\n",
 613                        p->protocol);
 614         } else {
 615                 spin_lock_bh(&inetsw6_lock);
 616                 list_del_rcu(&p->list);
 617                 spin_unlock_bh(&inetsw6_lock);
 618
 619                 synchronize_net();
 620         }
 621 }
 622
 623 int inet6_sk_rebuild_header(struct sock *sk)
 624 {
 625         int err;
 626         struct dst_entry *dst;
 627         struct ipv6_pinfo *np = inet6_sk(sk);
 628
 629         dst = __sk_dst_check(sk, np->dst_cookie);
 630
 631         if (dst == NULL) {
 632                 struct inet_sock *inet = inet_sk(sk);
 633                 struct in6_addr *final_p = NULL, final;
 634                 struct flowi fl;
 635
 636                 memset(&fl, 0, sizeof(fl));
 637                 fl.proto = sk->sk_protocol;
 638                 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 639                 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
 640                 fl.fl6_flowlabel = np->flow_label;
 641                 fl.oif = sk->sk_bound_dev_if;
 642                 fl.fl_ip_dport = inet->dport;
 643                 fl.fl_ip_sport = inet->sport;
 644                 security_sk_classify_flow(sk, &fl);
 645
 646                 if (np->opt && np->opt->srcrt) {
 647                         struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
 648                         ipv6_addr_copy(&final, &fl.fl6_dst);
 649                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 650                         final_p = &final;
 651                 }
 652
 653                 err = ip6_dst_lookup(sk, &dst, &fl);
 654                 if (err) {
 655                         sk->sk_route_caps = 0;
 656                         return err;
 657                 }
 658                 if (final_p)
 659                         ipv6_addr_copy(&fl.fl6_dst, final_p);
 660
 661                 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
 662                         sk->sk_err_soft = -err;
 663                         return err;
 664                 }
 665
 666                 __ip6_dst_store(sk, dst, NULL, NULL);
 667         }
 668
 669         return 0;
 670 }
 671
 672 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
 673
 674 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
 675 {
 676         struct ipv6_pinfo *np = inet6_sk(sk);
 677         struct inet6_skb_parm *opt = IP6CB(skb);
 678
 679         if (np->rxopt.all) {
 680                 if ((opt->hop && (np->rxopt.bits.hopopts ||
 681                                   np->rxopt.bits.ohopopts)) ||
 682                     ((IPV6_FLOWINFO_MASK & *(__be32*)skb->nh.raw) &&
 683                      np->rxopt.bits.rxflow) ||
 684                     (opt->srcrt && (np->rxopt.bits.srcrt ||
 685                      np->rxopt.bits.osrcrt)) ||
 686                     ((opt->dst1 || opt->dst0) &&
 687                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
 688                         return 1;
 689         }
 690         return 0;
 691 }
 692
 693 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
 694
 695 int
 696 snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign)
 697 {
 698         if (ptr == NULL)
 699                 return -EINVAL;
 700
 701         ptr[0] = __alloc_percpu(mibsize);
 702         if (!ptr[0])
 703                 goto err0;
 704
 705         ptr[1] = __alloc_percpu(mibsize);
 706         if (!ptr[1])
 707                 goto err1;
 708
 709         return 0;
 710
 711 err1:
 712         free_percpu(ptr[0]);
 713         ptr[0] = NULL;
 714 err0:
 715         return -ENOMEM;
 716 }
 717
 718 void
 719 snmp6_mib_free(void *ptr[2])
 720 {
 721         if (ptr == NULL)
 722                 return;
 723         free_percpu(ptr[0]);
 724         free_percpu(ptr[1]);
 725         ptr[0] = ptr[1] = NULL;
 726 }
 727
 728 static int __init init_ipv6_mibs(void)
 729 {
 730         if (snmp6_mib_init((void **)ipv6_statistics, sizeof (struct ipstats_mib),
 731                            __alignof__(struct ipstats_mib)) < 0)
 732                 goto err_ip_mib;
 733         if (snmp6_mib_init((void **)icmpv6_statistics, sizeof (struct icmpv6_mib),
 734                            __alignof__(struct icmpv6_mib)) < 0)
 735                 goto err_icmp_mib;
 736         if (snmp6_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib),
 737                            __alignof__(struct udp_mib)) < 0)
 738                 goto err_udp_mib;
 739         if (snmp6_mib_init((void **)udplite_stats_in6, sizeof (struct udp_mib),
 740                            __alignof__(struct udp_mib)) < 0)
 741                 goto err_udplite_mib;
 742         return 0;
 743
 744 err_udplite_mib:
 745         snmp6_mib_free((void **)udp_stats_in6);
 746 err_udp_mib:
 747         snmp6_mib_free((void **)icmpv6_statistics);
 748 err_icmp_mib:
 749         snmp6_mib_free((void **)ipv6_statistics);
 750 err_ip_mib:
 751         return -ENOMEM;
 752
 753 }
 754
 755 static void cleanup_ipv6_mibs(void)
 756 {
 757         snmp6_mib_free((void **)ipv6_statistics);
 758         snmp6_mib_free((void **)icmpv6_statistics);
 759         snmp6_mib_free((void **)udp_stats_in6);
 760         snmp6_mib_free((void **)udplite_stats_in6);
 761 }
 762
 763 static int __init inet6_init(void)
 764 {
 765         struct sk_buff *dummy_skb;
 766         struct list_head *r;
 767         int err;
 768
 769         BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
 770
 771 #ifdef MODULE
 772 #if 0 /* FIXME --RR */
 773         if (!mod_member_present(&__this_module, can_unload))
 774           return -EINVAL;
 775
 776         __this_module.can_unload = &ipv6_unload;
 777 #endif
 778 #endif
 779
 780         err = proto_register(&tcpv6_prot, 1);
 781         if (err)
 782                 goto out;
 783
 784         err = proto_register(&udpv6_prot, 1);
 785         if (err)
 786                 goto out_unregister_tcp_proto;
 787
 788         err = proto_register(&udplitev6_prot, 1);
 789         if (err)
 790                 goto out_unregister_udp_proto;
 791
 792         err = proto_register(&rawv6_prot, 1);
 793         if (err)
 794                 goto out_unregister_udplite_proto;
 795
 796
 797         /* Register the socket-side information for inet6_create.  */
 798         for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
 799                 INIT_LIST_HEAD(r);
 800
 801         /* We MUST register RAW sockets before we create the ICMP6,
 802          * IGMP6, or NDISC control sockets.
 803          */
 804         inet6_register_protosw(&rawv6_protosw);
 805
 806         /* Register the family here so that the init calls below will
 807          * be able to create sockets. (?? is this dangerous ??)
 808          */
 809         err = sock_register(&inet6_family_ops);
 810         if (err)
 811                 goto out_unregister_raw_proto;
 812
 813         /* Initialise ipv6 mibs */
 814         err = init_ipv6_mibs();
 815         if (err)
 816                 goto out_unregister_sock;
 817
 818         /*
 819          *      ipngwg API draft makes clear that the correct semantics
 820          *      for TCP and UDP is to consider one TCP and UDP instance
 821          *      in a host availiable by both INET and INET6 APIs and
 822          *      able to communicate via both network protocols.
 823          */
 824
 825 #ifdef CONFIG_SYSCTL
 826         ipv6_sysctl_register();
 827 #endif
 828         err = icmpv6_init(&inet6_family_ops);
 829         if (err)
 830                 goto icmp_fail;
 831         err = ndisc_init(&inet6_family_ops);
 832         if (err)
 833                 goto ndisc_fail;
 834         err = igmp6_init(&inet6_family_ops);
 835         if (err)
 836                 goto igmp_fail;
 837         err = ipv6_netfilter_init();
 838         if (err)
 839                 goto netfilter_fail;
 840         /* Create /proc/foo6 entries. */
 841 #ifdef CONFIG_PROC_FS
 842         err = -ENOMEM;
 843         if (raw6_proc_init())
 844                 goto proc_raw6_fail;
 845         if (tcp6_proc_init())
 846                 goto proc_tcp6_fail;
 847         if (udp6_proc_init())
 848                 goto proc_udp6_fail;
 849         if (udplite6_proc_init())
 850                 goto proc_udplite6_fail;
 851         if (ipv6_misc_proc_init())
 852                 goto proc_misc6_fail;
 853
 854         if (ac6_proc_init())
 855                 goto proc_anycast6_fail;
 856         if (if6_proc_init())
 857                 goto proc_if6_fail;
 858 #endif
 859         ip6_route_init();
 860         ip6_flowlabel_init();
 861         err = addrconf_init();
 862         if (err)
 863                 goto addrconf_fail;
 864
 865         /* Init v6 extension headers. */
 866         ipv6_rthdr_init();
 867         ipv6_frag_init();
 868         ipv6_nodata_init();
 869         ipv6_destopt_init();
 870 #ifdef CONFIG_IPV6_MIP6
 871         mip6_init();
 872 #endif
 873
 874         /* Init v6 transport protocols. */
 875         udpv6_init();
 876         udplitev6_init();
 877         tcpv6_init();
 878
 879         ipv6_packet_init();
 880         err = 0;
 881 out:
 882         return err;
 883
 884 addrconf_fail:
 885         ip6_flowlabel_cleanup();
 886         ip6_route_cleanup();
 887 #ifdef CONFIG_PROC_FS
 888         if6_proc_exit();
 889 proc_if6_fail:
 890         ac6_proc_exit();
 891 proc_anycast6_fail:
 892         ipv6_misc_proc_exit();
 893 proc_misc6_fail:
 894         udplite6_proc_exit();
 895 proc_udplite6_fail:
 896         udp6_proc_exit();
 897 proc_udp6_fail:
 898         tcp6_proc_exit();
 899 proc_tcp6_fail:
 900         raw6_proc_exit();
 901 proc_raw6_fail:
 902 #endif
 903         ipv6_netfilter_fini();
 904 netfilter_fail:
 905         igmp6_cleanup();
 906 igmp_fail:
 907         ndisc_cleanup();
 908 ndisc_fail:
 909         icmpv6_cleanup();
 910 icmp_fail:
 911 #ifdef CONFIG_SYSCTL
 912         ipv6_sysctl_unregister();
 913 #endif
 914         cleanup_ipv6_mibs();
 915 out_unregister_sock:
 916         sock_unregister(PF_INET6);
 917 out_unregister_raw_proto:
 918         proto_unregister(&rawv6_prot);
 919 out_unregister_udplite_proto:
 920         proto_unregister(&udplitev6_prot);
 921 out_unregister_udp_proto:
 922         proto_unregister(&udpv6_prot);
 923 out_unregister_tcp_proto:
 924         proto_unregister(&tcpv6_prot);
 925         goto out;
 926 }
 927 module_init(inet6_init);
 928
 929 static void __exit inet6_exit(void)
 930 {
 931         /* First of all disallow new sockets creation. */
 932         sock_unregister(PF_INET6);
 933 #ifdef CONFIG_PROC_FS
 934         if6_proc_exit();
 935         ac6_proc_exit();
 936         ipv6_misc_proc_exit();
 937         udp6_proc_exit();
 938         udplite6_proc_exit();
 939         tcp6_proc_exit();
 940         raw6_proc_exit();
 941 #endif
 942 #ifdef CONFIG_IPV6_MIP6
 943         mip6_fini();
 944 #endif
 945         /* Cleanup code parts. */
 946         ip6_flowlabel_cleanup();
 947         addrconf_cleanup();
 948         ip6_route_cleanup();
 949         ipv6_packet_cleanup();
 950         igmp6_cleanup();
 951         ipv6_netfilter_fini();
 952         ndisc_cleanup();
 953         icmpv6_cleanup();
 954 #ifdef CONFIG_SYSCTL
 955         ipv6_sysctl_unregister();
 956 #endif
 957         cleanup_ipv6_mibs();
 958         proto_unregister(&rawv6_prot);
 959         proto_unregister(&udpv6_prot);
 960         proto_unregister(&tcpv6_prot);
 961 }
 962 module_exit(inet6_exit);
 963
 964 MODULE_ALIAS_NETPROTO(PF_INET6);