net/ipv6/af_inet6.c

   1 /*
   2  *      PF_INET6 socket protocol family
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *
   8  *      Adapted from linux/net/ipv4/af_inet.c
   9  *
  10  *      Fixes:
  11  *      piggy, Karl Knutson     :       Socket protocol table
  12  *      Hideaki YOSHIFUJI       :       sin6_scope_id support
  13  *      Arnaldo Melo            :       check proc_net_create return, cleanups
  14  *
  15  *      This program is free software; you can redistribute it and/or
  16  *      modify it under the terms of the GNU General Public License
  17  *      as published by the Free Software Foundation; either version
  18  *      2 of the License, or (at your option) any later version.
  19  */
  20
  21
  22 #include <linux/module.h>
  23 #include <linux/capability.h>
  24 #include <linux/errno.h>
  25 #include <linux/types.h>
  26 #include <linux/socket.h>
  27 #include <linux/in.h>
  28 #include <linux/kernel.h>
  29 #include <linux/timer.h>
  30 #include <linux/string.h>
  31 #include <linux/sockios.h>
  32 #include <linux/net.h>
  33 #include <linux/fcntl.h>
  34 #include <linux/mm.h>
  35 #include <linux/interrupt.h>
  36 #include <linux/proc_fs.h>
  37 #include <linux/stat.h>
  38 #include <linux/init.h>
  39
  40 #include <linux/inet.h>
  41 #include <linux/netdevice.h>
  42 #include <linux/icmpv6.h>
  43 #include <linux/netfilter_ipv6.h>
  44
  45 #include <net/ip.h>
  46 #include <net/ipv6.h>
  47 #include <net/udp.h>
  48 #include <net/udplite.h>
  49 #include <net/tcp.h>
  50 #include <net/ipip.h>
  51 #include <net/protocol.h>
  52 #include <net/inet_common.h>
  53 #include <net/transp_v6.h>
  54 #include <net/ip6_route.h>
  55 #include <net/addrconf.h>
  56 #ifdef CONFIG_IPV6_TUNNEL
  57 #include <net/ip6_tunnel.h>
  58 #endif
  59
  60 #include <asm/uaccess.h>
  61 #include <asm/system.h>
  62 #include <linux/mroute6.h>
  63
  64 MODULE_AUTHOR("Cast of dozens");
  65 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
  66 MODULE_LICENSE("GPL");
  67
  68 /* The inetsw6 table contains everything that inet6_create needs to
  69  * build a new socket.
  70  */
  71 static struct list_head inetsw6[SOCK_MAX];
  72 static DEFINE_SPINLOCK(inetsw6_lock);
  73
  74 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
  75 {
  76         const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
  77
  78         return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
  79 }
  80
  81 static int inet6_create(struct net *net, struct socket *sock, int protocol)
  82 {
  83         struct inet_sock *inet;
  84         struct ipv6_pinfo *np;
  85         struct sock *sk;
  86         struct inet_protosw *answer;
  87         struct proto *answer_prot;
  88         unsigned char answer_flags;
  89         char answer_no_check;
  90         int try_loading_module = 0;
  91         int err;
  92
  93         if (sock->type != SOCK_RAW &&
  94             sock->type != SOCK_DGRAM &&
  95             !inet_ehash_secret)
  96                 build_ehash_secret();
  97
  98         /* Look for the requested type/protocol pair. */
  99 lookup_protocol:
 100         err = -ESOCKTNOSUPPORT;
 101         rcu_read_lock();
 102         list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
 103
 104                 err = 0;
 105                 /* Check the non-wild match. */
 106                 if (protocol == answer->protocol) {
 107                         if (protocol != IPPROTO_IP)
 108                                 break;
 109                 } else {
 110                         /* Check for the two wild cases. */
 111                         if (IPPROTO_IP == protocol) {
 112                                 protocol = answer->protocol;
 113                                 break;
 114                         }
 115                         if (IPPROTO_IP == answer->protocol)
 116                                 break;
 117                 }
 118                 err = -EPROTONOSUPPORT;
 119         }
 120
 121         if (err) {
 122                 if (try_loading_module < 2) {
 123                         rcu_read_unlock();
 124                         /*
 125                          * Be more specific, e.g. net-pf-10-proto-132-type-1
 126                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
 127                          */
 128                         if (++try_loading_module == 1)
 129                                 request_module("net-pf-%d-proto-%d-type-%d",
 130                                                 PF_INET6, protocol, sock->type);
 131                         /*
 132                          * Fall back to generic, e.g. net-pf-10-proto-132
 133                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
 134                          */
 135                         else
 136                                 request_module("net-pf-%d-proto-%d",
 137                                                 PF_INET6, protocol);
 138                         goto lookup_protocol;
 139                 } else
 140                         goto out_rcu_unlock;
 141         }
 142
 143         err = -EPERM;
 144         if (answer->capability > 0 && !capable(answer->capability))
 145                 goto out_rcu_unlock;
 146
 147         sock->ops = answer->ops;
 148         answer_prot = answer->prot;
 149         answer_no_check = answer->no_check;
 150         answer_flags = answer->flags;
 151         rcu_read_unlock();
 152
 153         WARN_ON(answer_prot->slab == NULL);
 154
 155         err = -ENOBUFS;
 156         sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot);
 157         if (sk == NULL)
 158                 goto out;
 159
 160         sock_init_data(sock, sk);
 161
 162         err = 0;
 163         sk->sk_no_check = answer_no_check;
 164         if (INET_PROTOSW_REUSE & answer_flags)
 165                 sk->sk_reuse = 1;
 166
 167         inet = inet_sk(sk);
 168         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
 169
 170         if (SOCK_RAW == sock->type) {
 171                 inet->num = protocol;
 172                 if (IPPROTO_RAW == protocol)
 173                         inet->hdrincl = 1;
 174         }
 175
 176         sk->sk_destruct         = inet_sock_destruct;
 177         sk->sk_family           = PF_INET6;
 178         sk->sk_protocol         = protocol;
 179
 180         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
 181
 182         inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
 183         np->hop_limit   = -1;
 184         np->mcast_hops  = -1;
 185         np->mc_loop     = 1;
 186         np->pmtudisc    = IPV6_PMTUDISC_WANT;
 187         np->ipv6only    = net->ipv6.sysctl.bindv6only;
 188
 189         /* Init the ipv4 part of the socket since we can have sockets
 190          * using v6 API for ipv4.
 191          */
 192         inet->uc_ttl    = -1;
 193
 194         inet->mc_loop   = 1;
 195         inet->mc_ttl    = 1;
 196         inet->mc_index  = 0;
 197         inet->mc_list   = NULL;
 198
 199         if (ipv4_config.no_pmtu_disc)
 200                 inet->pmtudisc = IP_PMTUDISC_DONT;
 201         else
 202                 inet->pmtudisc = IP_PMTUDISC_WANT;
 203         /*
 204          * Increment only the relevant sk_prot->socks debug field, this changes
 205          * the previous behaviour of incrementing both the equivalent to
 206          * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
 207          *
 208          * This allows better debug granularity as we'll know exactly how many
 209          * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
 210          * transport protocol socks. -acme
 211          */
 212         sk_refcnt_debug_inc(sk);
 213
 214         if (inet->num) {
 215                 /* It assumes that any protocol which allows
 216                  * the user to assign a number at socket
 217                  * creation time automatically shares.
 218                  */
 219                 inet->sport = htons(inet->num);
 220                 sk->sk_prot->hash(sk);
 221         }
 222         if (sk->sk_prot->init) {
 223                 err = sk->sk_prot->init(sk);
 224                 if (err) {
 225                         sk_common_release(sk);
 226                         goto out;
 227                 }
 228         }
 229 out:
 230         return err;
 231 out_rcu_unlock:
 232         rcu_read_unlock();
 233         goto out;
 234 }
 235
 236
 237 /* bind for INET6 API */
 238 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 239 {
 240         struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
 241         struct sock *sk = sock->sk;
 242         struct inet_sock *inet = inet_sk(sk);
 243         struct ipv6_pinfo *np = inet6_sk(sk);
 244         struct net *net = sock_net(sk);
 245         __be32 v4addr = 0;
 246         unsigned short snum;
 247         int addr_type = 0;
 248         int err = 0;
 249
 250         /* If the socket has its own bind function then use it. */
 251         if (sk->sk_prot->bind)
 252                 return sk->sk_prot->bind(sk, uaddr, addr_len);
 253
 254         if (addr_len < SIN6_LEN_RFC2133)
 255                 return -EINVAL;
 256         addr_type = ipv6_addr_type(&addr->sin6_addr);
 257         if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
 258                 return -EINVAL;
 259
 260         snum = ntohs(addr->sin6_port);
 261         if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
 262                 return -EACCES;
 263
 264         lock_sock(sk);
 265
 266         /* Check these errors (active socket, double bind). */
 267         if (sk->sk_state != TCP_CLOSE || inet->num) {
 268                 err = -EINVAL;
 269                 goto out;
 270         }
 271
 272         /* Check if the address belongs to the host. */
 273         if (addr_type == IPV6_ADDR_MAPPED) {
 274                 v4addr = addr->sin6_addr.s6_addr32[3];
 275                 if (inet_addr_type(net, v4addr) != RTN_LOCAL) {
 276                         err = -EADDRNOTAVAIL;
 277                         goto out;
 278                 }
 279         } else {
 280                 if (addr_type != IPV6_ADDR_ANY) {
 281                         struct net_device *dev = NULL;
 282
 283                         if (addr_type & IPV6_ADDR_LINKLOCAL) {
 284                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 285                                     addr->sin6_scope_id) {
 286                                         /* Override any existing binding, if another one
 287                                          * is supplied by user.
 288                                          */
 289                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
 290                                 }
 291
 292                                 /* Binding to link-local address requires an interface */
 293                                 if (!sk->sk_bound_dev_if) {
 294                                         err = -EINVAL;
 295                                         goto out;
 296                                 }
 297                                 dev = dev_get_by_index(net, sk->sk_bound_dev_if);
 298                                 if (!dev) {
 299                                         err = -ENODEV;
 300                                         goto out;
 301                                 }
 302                         }
 303
 304                         /* ipv4 addr of the socket is invalid.  Only the
 305                          * unspecified and mapped address have a v4 equivalent.
 306                          */
 307                         v4addr = LOOPBACK4_IPV6;
 308                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
 309                                 if (!ipv6_chk_addr(net, &addr->sin6_addr,
 310                                                    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 = htons(inet->num);
 342         inet->dport = 0;
 343         inet->daddr = 0;
 344 out:
 345         release_sock(sk);
 346         return err;
 347 }
 348
 349 EXPORT_SYMBOL(inet6_bind);
 350
 351 int inet6_release(struct socket *sock)
 352 {
 353         struct sock *sk = sock->sk;
 354
 355         if (sk == NULL)
 356                 return -EINVAL;
 357
 358         /* Free mc lists */
 359         ipv6_sock_mc_close(sk);
 360
 361         /* Free ac lists */
 362         ipv6_sock_ac_close(sk);
 363
 364         return inet_release(sock);
 365 }
 366
 367 EXPORT_SYMBOL(inet6_release);
 368
 369 void 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
 389 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
 390
 391 /*
 392  *      This does both peername and sockname.
 393  */
 394
 395 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 396                  int *uaddr_len, int peer)
 397 {
 398         struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
 399         struct sock *sk = sock->sk;
 400         struct inet_sock *inet = inet_sk(sk);
 401         struct ipv6_pinfo *np = inet6_sk(sk);
 402
 403         sin->sin6_family = AF_INET6;
 404         sin->sin6_flowinfo = 0;
 405         sin->sin6_scope_id = 0;
 406         if (peer) {
 407                 if (!inet->dport)
 408                         return -ENOTCONN;
 409                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
 410                     peer == 1)
 411                         return -ENOTCONN;
 412                 sin->sin6_port = inet->dport;
 413                 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
 414                 if (np->sndflow)
 415                         sin->sin6_flowinfo = np->flow_label;
 416         } else {
 417                 if (ipv6_addr_any(&np->rcv_saddr))
 418                         ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
 419                 else
 420                         ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
 421
 422                 sin->sin6_port = inet->sport;
 423         }
 424         if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
 425                 sin->sin6_scope_id = sk->sk_bound_dev_if;
 426         *uaddr_len = sizeof(*sin);
 427         return(0);
 428 }
 429
 430 EXPORT_SYMBOL(inet6_getname);
 431
 432 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 433 {
 434         struct sock *sk = sock->sk;
 435         struct net *net = sock_net(sk);
 436
 437         switch(cmd)
 438         {
 439         case SIOCGSTAMP:
 440                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
 441
 442         case SIOCGSTAMPNS:
 443                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
 444
 445         case SIOCADDRT:
 446         case SIOCDELRT:
 447
 448                 return(ipv6_route_ioctl(net, cmd, (void __user *)arg));
 449
 450         case SIOCSIFADDR:
 451                 return addrconf_add_ifaddr(net, (void __user *) arg);
 452         case SIOCDIFADDR:
 453                 return addrconf_del_ifaddr(net, (void __user *) arg);
 454         case SIOCSIFDSTADDR:
 455                 return addrconf_set_dstaddr(net, (void __user *) arg);
 456         default:
 457                 if (!sk->sk_prot->ioctl)
 458                         return -ENOIOCTLCMD;
 459                 return sk->sk_prot->ioctl(sk, cmd, arg);
 460         }
 461         /*NOTREACHED*/
 462         return(0);
 463 }
 464
 465 EXPORT_SYMBOL(inet6_ioctl);
 466
 467 const struct proto_ops inet6_stream_ops = {
 468         .family            = PF_INET6,
 469         .owner             = THIS_MODULE,
 470         .release           = inet6_release,
 471         .bind              = inet6_bind,
 472         .connect           = inet_stream_connect,       /* ok           */
 473         .socketpair        = sock_no_socketpair,        /* a do nothing */
 474         .accept            = inet_accept,               /* ok           */
 475         .getname           = inet6_getname,
 476         .poll              = tcp_poll,                  /* ok           */
 477         .ioctl             = inet6_ioctl,               /* must change  */
 478         .listen            = inet_listen,               /* ok           */
 479         .shutdown          = inet_shutdown,             /* ok           */
 480         .setsockopt        = sock_common_setsockopt,    /* ok           */
 481         .getsockopt        = sock_common_getsockopt,    /* ok           */
 482         .sendmsg           = tcp_sendmsg,               /* ok           */
 483         .recvmsg           = sock_common_recvmsg,       /* ok           */
 484         .mmap              = sock_no_mmap,
 485         .sendpage          = tcp_sendpage,
 486         .splice_read       = tcp_splice_read,
 487 #ifdef CONFIG_COMPAT
 488         .compat_setsockopt = compat_sock_common_setsockopt,
 489         .compat_getsockopt = compat_sock_common_getsockopt,
 490 #endif
 491 };
 492
 493 const struct proto_ops inet6_dgram_ops = {
 494         .family            = PF_INET6,
 495         .owner             = THIS_MODULE,
 496         .release           = inet6_release,
 497         .bind              = inet6_bind,
 498         .connect           = inet_dgram_connect,        /* ok           */
 499         .socketpair        = sock_no_socketpair,        /* a do nothing */
 500         .accept            = sock_no_accept,            /* a do nothing */
 501         .getname           = inet6_getname,
 502         .poll              = udp_poll,                  /* ok           */
 503         .ioctl             = inet6_ioctl,               /* must change  */
 504         .listen            = sock_no_listen,            /* ok           */
 505         .shutdown          = inet_shutdown,             /* ok           */
 506         .setsockopt        = sock_common_setsockopt,    /* ok           */
 507         .getsockopt        = sock_common_getsockopt,    /* ok           */
 508         .sendmsg           = inet_sendmsg,              /* ok           */
 509         .recvmsg           = sock_common_recvmsg,       /* ok           */
 510         .mmap              = sock_no_mmap,
 511         .sendpage          = sock_no_sendpage,
 512 #ifdef CONFIG_COMPAT
 513         .compat_setsockopt = compat_sock_common_setsockopt,
 514         .compat_getsockopt = compat_sock_common_getsockopt,
 515 #endif
 516 };
 517
 518 static struct net_proto_family inet6_family_ops = {
 519         .family = PF_INET6,
 520         .create = inet6_create,
 521         .owner  = THIS_MODULE,
 522 };
 523
 524 int inet6_register_protosw(struct inet_protosw *p)
 525 {
 526         struct list_head *lh;
 527         struct inet_protosw *answer;
 528         struct list_head *last_perm;
 529         int protocol = p->protocol;
 530         int ret;
 531
 532         spin_lock_bh(&inetsw6_lock);
 533
 534         ret = -EINVAL;
 535         if (p->type >= SOCK_MAX)
 536                 goto out_illegal;
 537
 538         /* If we are trying to override a permanent protocol, bail. */
 539         answer = NULL;
 540         ret = -EPERM;
 541         last_perm = &inetsw6[p->type];
 542         list_for_each(lh, &inetsw6[p->type]) {
 543                 answer = list_entry(lh, struct inet_protosw, list);
 544
 545                 /* Check only the non-wild match. */
 546                 if (INET_PROTOSW_PERMANENT & answer->flags) {
 547                         if (protocol == answer->protocol)
 548                                 break;
 549                         last_perm = lh;
 550                 }
 551
 552                 answer = NULL;
 553         }
 554         if (answer)
 555                 goto out_permanent;
 556
 557         /* Add the new entry after the last permanent entry if any, so that
 558          * the new entry does not override a permanent entry when matched with
 559          * a wild-card protocol. But it is allowed to override any existing
 560          * non-permanent entry.  This means that when we remove this entry, the
 561          * system automatically returns to the old behavior.
 562          */
 563         list_add_rcu(&p->list, last_perm);
 564         ret = 0;
 565 out:
 566         spin_unlock_bh(&inetsw6_lock);
 567         return ret;
 568
 569 out_permanent:
 570         printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
 571                protocol);
 572         goto out;
 573
 574 out_illegal:
 575         printk(KERN_ERR
 576                "Ignoring attempt to register invalid socket type %d.\n",
 577                p->type);
 578         goto out;
 579 }
 580
 581 EXPORT_SYMBOL(inet6_register_protosw);
 582
 583 void
 584 inet6_unregister_protosw(struct inet_protosw *p)
 585 {
 586         if (INET_PROTOSW_PERMANENT & p->flags) {
 587                 printk(KERN_ERR
 588                        "Attempt to unregister permanent protocol %d.\n",
 589                        p->protocol);
 590         } else {
 591                 spin_lock_bh(&inetsw6_lock);
 592                 list_del_rcu(&p->list);
 593                 spin_unlock_bh(&inetsw6_lock);
 594
 595                 synchronize_net();
 596         }
 597 }
 598
 599 EXPORT_SYMBOL(inet6_unregister_protosw);
 600
 601 int inet6_sk_rebuild_header(struct sock *sk)
 602 {
 603         int err;
 604         struct dst_entry *dst;
 605         struct ipv6_pinfo *np = inet6_sk(sk);
 606
 607         dst = __sk_dst_check(sk, np->dst_cookie);
 608
 609         if (dst == NULL) {
 610                 struct inet_sock *inet = inet_sk(sk);
 611                 struct in6_addr *final_p = NULL, final;
 612                 struct flowi fl;
 613
 614                 memset(&fl, 0, sizeof(fl));
 615                 fl.proto = sk->sk_protocol;
 616                 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 617                 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
 618                 fl.fl6_flowlabel = np->flow_label;
 619                 fl.oif = sk->sk_bound_dev_if;
 620                 fl.fl_ip_dport = inet->dport;
 621                 fl.fl_ip_sport = inet->sport;
 622                 security_sk_classify_flow(sk, &fl);
 623
 624                 if (np->opt && np->opt->srcrt) {
 625                         struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
 626                         ipv6_addr_copy(&final, &fl.fl6_dst);
 627                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 628                         final_p = &final;
 629                 }
 630
 631                 err = ip6_dst_lookup(sk, &dst, &fl);
 632                 if (err) {
 633                         sk->sk_route_caps = 0;
 634                         return err;
 635                 }
 636                 if (final_p)
 637                         ipv6_addr_copy(&fl.fl6_dst, final_p);
 638
 639                 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
 640                         sk->sk_err_soft = -err;
 641                         return err;
 642                 }
 643
 644                 __ip6_dst_store(sk, dst, NULL, NULL);
 645         }
 646
 647         return 0;
 648 }
 649
 650 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
 651
 652 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
 653 {
 654         struct ipv6_pinfo *np = inet6_sk(sk);
 655         struct inet6_skb_parm *opt = IP6CB(skb);
 656
 657         if (np->rxopt.all) {
 658                 if ((opt->hop && (np->rxopt.bits.hopopts ||
 659                                   np->rxopt.bits.ohopopts)) ||
 660                     ((IPV6_FLOWINFO_MASK &
 661                       *(__be32 *)skb_network_header(skb)) &&
 662                      np->rxopt.bits.rxflow) ||
 663                     (opt->srcrt && (np->rxopt.bits.srcrt ||
 664                      np->rxopt.bits.osrcrt)) ||
 665                     ((opt->dst1 || opt->dst0) &&
 666                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
 667                         return 1;
 668         }
 669         return 0;
 670 }
 671
 672 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
 673
 674 static struct inet6_protocol *ipv6_gso_pull_exthdrs(struct sk_buff *skb,
 675                                                     int proto)
 676 {
 677         struct inet6_protocol *ops = NULL;
 678
 679         for (;;) {
 680                 struct ipv6_opt_hdr *opth;
 681                 int len;
 682
 683                 if (proto != NEXTHDR_HOP) {
 684                         ops = rcu_dereference(inet6_protos[proto]);
 685
 686                         if (unlikely(!ops))
 687                                 break;
 688
 689                         if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
 690                                 break;
 691                 }
 692
 693                 if (unlikely(!pskb_may_pull(skb, 8)))
 694                         break;
 695
 696                 opth = (void *)skb->data;
 697                 len = ipv6_optlen(opth);
 698
 699                 if (unlikely(!pskb_may_pull(skb, len)))
 700                         break;
 701
 702                 proto = opth->nexthdr;
 703                 __skb_pull(skb, len);
 704         }
 705
 706         return ops;
 707 }
 708
 709 static int ipv6_gso_send_check(struct sk_buff *skb)
 710 {
 711         struct ipv6hdr *ipv6h;
 712         struct inet6_protocol *ops;
 713         int err = -EINVAL;
 714
 715         if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
 716                 goto out;
 717
 718         ipv6h = ipv6_hdr(skb);
 719         __skb_pull(skb, sizeof(*ipv6h));
 720         err = -EPROTONOSUPPORT;
 721
 722         rcu_read_lock();
 723         ops = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
 724         if (likely(ops && ops->gso_send_check)) {
 725                 skb_reset_transport_header(skb);
 726                 err = ops->gso_send_check(skb);
 727         }
 728         rcu_read_unlock();
 729
 730 out:
 731         return err;
 732 }
 733
 734 static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features)
 735 {
 736         struct sk_buff *segs = ERR_PTR(-EINVAL);
 737         struct ipv6hdr *ipv6h;
 738         struct inet6_protocol *ops;
 739
 740         if (!(features & NETIF_F_V6_CSUM))
 741                 features &= ~NETIF_F_SG;
 742
 743         if (unlikely(skb_shinfo(skb)->gso_type &
 744                      ~(SKB_GSO_UDP |
 745                        SKB_GSO_DODGY |
 746                        SKB_GSO_TCP_ECN |
 747                        SKB_GSO_TCPV6 |
 748                        0)))
 749                 goto out;
 750
 751         if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
 752                 goto out;
 753
 754         ipv6h = ipv6_hdr(skb);
 755         __skb_pull(skb, sizeof(*ipv6h));
 756         segs = ERR_PTR(-EPROTONOSUPPORT);
 757
 758         rcu_read_lock();
 759         ops = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
 760         if (likely(ops && ops->gso_segment)) {
 761                 skb_reset_transport_header(skb);
 762                 segs = ops->gso_segment(skb, features);
 763         }
 764         rcu_read_unlock();
 765
 766         if (unlikely(IS_ERR(segs)))
 767                 goto out;
 768
 769         for (skb = segs; skb; skb = skb->next) {
 770                 ipv6h = ipv6_hdr(skb);
 771                 ipv6h->payload_len = htons(skb->len - skb->mac_len -
 772                                            sizeof(*ipv6h));
 773         }
 774
 775 out:
 776         return segs;
 777 }
 778
 779 static struct packet_type ipv6_packet_type = {
 780         .type = __constant_htons(ETH_P_IPV6),
 781         .func = ipv6_rcv,
 782         .gso_send_check = ipv6_gso_send_check,
 783         .gso_segment = ipv6_gso_segment,
 784 };
 785
 786 static int __init ipv6_packet_init(void)
 787 {
 788         dev_add_pack(&ipv6_packet_type);
 789         return 0;
 790 }
 791
 792 static void ipv6_packet_cleanup(void)
 793 {
 794         dev_remove_pack(&ipv6_packet_type);
 795 }
 796
 797 static int __init init_ipv6_mibs(void)
 798 {
 799         if (snmp_mib_init((void **)ipv6_statistics,
 800                           sizeof(struct ipstats_mib)) < 0)
 801                 goto err_ip_mib;
 802         if (snmp_mib_init((void **)icmpv6_statistics,
 803                           sizeof(struct icmpv6_mib)) < 0)
 804                 goto err_icmp_mib;
 805         if (snmp_mib_init((void **)icmpv6msg_statistics,
 806                           sizeof(struct icmpv6msg_mib)) < 0)
 807                 goto err_icmpmsg_mib;
 808         if (snmp_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib)) < 0)
 809                 goto err_udp_mib;
 810         if (snmp_mib_init((void **)udplite_stats_in6,
 811                           sizeof (struct udp_mib)) < 0)
 812                 goto err_udplite_mib;
 813         return 0;
 814
 815 err_udplite_mib:
 816         snmp_mib_free((void **)udp_stats_in6);
 817 err_udp_mib:
 818         snmp_mib_free((void **)icmpv6msg_statistics);
 819 err_icmpmsg_mib:
 820         snmp_mib_free((void **)icmpv6_statistics);
 821 err_icmp_mib:
 822         snmp_mib_free((void **)ipv6_statistics);
 823 err_ip_mib:
 824         return -ENOMEM;
 825
 826 }
 827
 828 static void cleanup_ipv6_mibs(void)
 829 {
 830         snmp_mib_free((void **)ipv6_statistics);
 831         snmp_mib_free((void **)icmpv6_statistics);
 832         snmp_mib_free((void **)icmpv6msg_statistics);
 833         snmp_mib_free((void **)udp_stats_in6);
 834         snmp_mib_free((void **)udplite_stats_in6);
 835 }
 836
 837 static int inet6_net_init(struct net *net)
 838 {
 839         int err = 0;
 840
 841         net->ipv6.sysctl.bindv6only = 0;
 842         net->ipv6.sysctl.flush_delay = 0;
 843         net->ipv6.sysctl.ip6_rt_max_size = 4096;
 844         net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
 845         net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
 846         net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
 847         net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
 848         net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
 849         net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
 850         net->ipv6.sysctl.icmpv6_time = 1*HZ;
 851
 852 #ifdef CONFIG_PROC_FS
 853         err = udp6_proc_init(net);
 854         if (err)
 855                 goto out;
 856         err = tcp6_proc_init(net);
 857         if (err)
 858                 goto proc_tcp6_fail;
 859         err = ac6_proc_init(net);
 860         if (err)
 861                 goto proc_ac6_fail;
 862 out:
 863 #endif
 864         return err;
 865
 866 #ifdef CONFIG_PROC_FS
 867 proc_ac6_fail:
 868         tcp6_proc_exit(net);
 869 proc_tcp6_fail:
 870         udp6_proc_exit(net);
 871         goto out;
 872 #endif
 873 }
 874
 875 static void inet6_net_exit(struct net *net)
 876 {
 877 #ifdef CONFIG_PROC_FS
 878         udp6_proc_exit(net);
 879         tcp6_proc_exit(net);
 880         ac6_proc_exit(net);
 881 #endif
 882 }
 883
 884 static struct pernet_operations inet6_net_ops = {
 885         .init = inet6_net_init,
 886         .exit = inet6_net_exit,
 887 };
 888
 889 static int __init inet6_init(void)
 890 {
 891         struct sk_buff *dummy_skb;
 892         struct list_head *r;
 893         int err;
 894
 895         BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
 896
 897         err = proto_register(&tcpv6_prot, 1);
 898         if (err)
 899                 goto out;
 900
 901         err = proto_register(&udpv6_prot, 1);
 902         if (err)
 903                 goto out_unregister_tcp_proto;
 904
 905         err = proto_register(&udplitev6_prot, 1);
 906         if (err)
 907                 goto out_unregister_udp_proto;
 908
 909         err = proto_register(&rawv6_prot, 1);
 910         if (err)
 911                 goto out_unregister_udplite_proto;
 912
 913
 914         /* Register the socket-side information for inet6_create.  */
 915         for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
 916                 INIT_LIST_HEAD(r);
 917
 918         /* We MUST register RAW sockets before we create the ICMP6,
 919          * IGMP6, or NDISC control sockets.
 920          */
 921         err = rawv6_init();
 922         if (err)
 923                 goto out_unregister_raw_proto;
 924
 925         /* Register the family here so that the init calls below will
 926          * be able to create sockets. (?? is this dangerous ??)
 927          */
 928         err = sock_register(&inet6_family_ops);
 929         if (err)
 930                 goto out_sock_register_fail;
 931
 932         /* Initialise ipv6 mibs */
 933         err = init_ipv6_mibs();
 934         if (err)
 935                 goto out_unregister_sock;
 936
 937 #ifdef CONFIG_SYSCTL
 938         err = ipv6_static_sysctl_register();
 939         if (err)
 940                 goto static_sysctl_fail;
 941 #endif
 942         /*
 943          *      ipngwg API draft makes clear that the correct semantics
 944          *      for TCP and UDP is to consider one TCP and UDP instance
 945          *      in a host availiable by both INET and INET6 APIs and
 946          *      able to communicate via both network protocols.
 947          */
 948
 949         err = register_pernet_subsys(&inet6_net_ops);
 950         if (err)
 951                 goto register_pernet_fail;
 952         err = icmpv6_init();
 953         if (err)
 954                 goto icmp_fail;
 955         err = ip6_mr_init();
 956         if (err)
 957                 goto ipmr_fail;
 958         err = ndisc_init();
 959         if (err)
 960                 goto ndisc_fail;
 961         err = igmp6_init();
 962         if (err)
 963                 goto igmp_fail;
 964         err = ipv6_netfilter_init();
 965         if (err)
 966                 goto netfilter_fail;
 967         /* Create /proc/foo6 entries. */
 968 #ifdef CONFIG_PROC_FS
 969         err = -ENOMEM;
 970         if (raw6_proc_init())
 971                 goto proc_raw6_fail;
 972         if (udplite6_proc_init())
 973                 goto proc_udplite6_fail;
 974         if (ipv6_misc_proc_init())
 975                 goto proc_misc6_fail;
 976         if (if6_proc_init())
 977                 goto proc_if6_fail;
 978 #endif
 979         err = ip6_route_init();
 980         if (err)
 981                 goto ip6_route_fail;
 982         err = ip6_flowlabel_init();
 983         if (err)
 984                 goto ip6_flowlabel_fail;
 985         err = addrconf_init();
 986         if (err)
 987                 goto addrconf_fail;
 988
 989         /* Init v6 extension headers. */
 990         err = ipv6_exthdrs_init();
 991         if (err)
 992                 goto ipv6_exthdrs_fail;
 993
 994         err = ipv6_frag_init();
 995         if (err)
 996                 goto ipv6_frag_fail;
 997
 998         /* Init v6 transport protocols. */
 999         err = udpv6_init();
1000         if (err)
1001                 goto udpv6_fail;
1002
1003         err = udplitev6_init();
1004         if (err)
1005                 goto udplitev6_fail;
1006
1007         err = tcpv6_init();
1008         if (err)
1009                 goto tcpv6_fail;
1010
1011         err = ipv6_packet_init();
1012         if (err)
1013                 goto ipv6_packet_fail;
1014
1015 #ifdef CONFIG_SYSCTL
1016         err = ipv6_sysctl_register();
1017         if (err)
1018                 goto sysctl_fail;
1019 #endif
1020 out:
1021         return err;
1022
1023 #ifdef CONFIG_SYSCTL
1024 sysctl_fail:
1025         ipv6_packet_cleanup();
1026 #endif
1027 ipv6_packet_fail:
1028         tcpv6_exit();
1029 tcpv6_fail:
1030         udplitev6_exit();
1031 udplitev6_fail:
1032         udpv6_exit();
1033 udpv6_fail:
1034         ipv6_frag_exit();
1035 ipv6_frag_fail:
1036         ipv6_exthdrs_exit();
1037 ipv6_exthdrs_fail:
1038         addrconf_cleanup();
1039 addrconf_fail:
1040         ip6_flowlabel_cleanup();
1041 ip6_flowlabel_fail:
1042         ip6_route_cleanup();
1043 ip6_route_fail:
1044 #ifdef CONFIG_PROC_FS
1045         if6_proc_exit();
1046 proc_if6_fail:
1047         ipv6_misc_proc_exit();
1048 proc_misc6_fail:
1049         udplite6_proc_exit();
1050 proc_udplite6_fail:
1051         raw6_proc_exit();
1052 proc_raw6_fail:
1053 #endif
1054         ipv6_netfilter_fini();
1055 netfilter_fail:
1056         igmp6_cleanup();
1057 igmp_fail:
1058         ndisc_cleanup();
1059 ndisc_fail:
1060         ip6_mr_cleanup();
1061 ipmr_fail:
1062         icmpv6_cleanup();
1063 icmp_fail:
1064         unregister_pernet_subsys(&inet6_net_ops);
1065 register_pernet_fail:
1066 #ifdef CONFIG_SYSCTL
1067         ipv6_static_sysctl_unregister();
1068 static_sysctl_fail:
1069 #endif
1070         cleanup_ipv6_mibs();
1071 out_unregister_sock:
1072         sock_unregister(PF_INET6);
1073         rtnl_unregister_all(PF_INET6);
1074 out_sock_register_fail:
1075         rawv6_exit();
1076 out_unregister_raw_proto:
1077         proto_unregister(&rawv6_prot);
1078 out_unregister_udplite_proto:
1079         proto_unregister(&udplitev6_prot);
1080 out_unregister_udp_proto:
1081         proto_unregister(&udpv6_prot);
1082 out_unregister_tcp_proto:
1083         proto_unregister(&tcpv6_prot);
1084         goto out;
1085 }
1086 module_init(inet6_init);
1087
1088 static void __exit inet6_exit(void)
1089 {
1090         /* First of all disallow new sockets creation. */
1091         sock_unregister(PF_INET6);
1092         /* Disallow any further netlink messages */
1093         rtnl_unregister_all(PF_INET6);
1094
1095 #ifdef CONFIG_SYSCTL
1096         ipv6_sysctl_unregister();
1097 #endif
1098         udpv6_exit();
1099         udplitev6_exit();
1100         tcpv6_exit();
1101
1102         /* Cleanup code parts. */
1103         ipv6_packet_cleanup();
1104         ipv6_frag_exit();
1105         ipv6_exthdrs_exit();
1106         addrconf_cleanup();
1107         ip6_flowlabel_cleanup();
1108         ip6_route_cleanup();
1109 #ifdef CONFIG_PROC_FS
1110
1111         /* Cleanup code parts. */
1112         if6_proc_exit();
1113         ipv6_misc_proc_exit();
1114         udplite6_proc_exit();
1115         raw6_proc_exit();
1116 #endif
1117         ipv6_netfilter_fini();
1118         igmp6_cleanup();
1119         ndisc_cleanup();
1120         ip6_mr_cleanup();
1121         icmpv6_cleanup();
1122         rawv6_exit();
1123
1124         unregister_pernet_subsys(&inet6_net_ops);
1125 #ifdef CONFIG_SYSCTL
1126         ipv6_static_sysctl_unregister();
1127 #endif
1128         cleanup_ipv6_mibs();
1129         proto_unregister(&rawv6_prot);
1130         proto_unregister(&udplitev6_prot);
1131         proto_unregister(&udpv6_prot);
1132         proto_unregister(&tcpv6_prot);
1133 }
1134 module_exit(inet6_exit);
1135
1136 MODULE_ALIAS_NETPROTO(PF_INET6);