SAFE public projects git trees. - safe/jmp/linux-2.6/blob - net/ipv6/af_inet6.c

   1 /*
   2  *      PF_INET6 socket protocol family
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *
   8  *      Adapted from linux/net/ipv4/af_inet.c
   9  *
  10  *      Fixes:
  11  *      piggy, Karl Knutson     :       Socket protocol table
  12  *      Hideaki YOSHIFUJI       :       sin6_scope_id support
  13  *      Arnaldo Melo            :       check proc_net_create return, cleanups
  14  *
  15  *      This program is free software; you can redistribute it and/or
  16  *      modify it under the terms of the GNU General Public License
  17  *      as published by the Free Software Foundation; either version
  18  *      2 of the License, or (at your option) any later version.
  19  */
  20
  21
  22 #include <linux/module.h>
  23 #include <linux/capability.h>
  24 #include <linux/errno.h>
  25 #include <linux/types.h>
  26 #include <linux/socket.h>
  27 #include <linux/in.h>
  28 #include <linux/kernel.h>
  29 #include <linux/timer.h>
  30 #include <linux/string.h>
  31 #include <linux/sockios.h>
  32 #include <linux/net.h>
  33 #include <linux/fcntl.h>
  34 #include <linux/mm.h>
  35 #include <linux/interrupt.h>
  36 #include <linux/proc_fs.h>
  37 #include <linux/stat.h>
  38 #include <linux/init.h>
  39
  40 #include <linux/inet.h>
  41 #include <linux/netdevice.h>
  42 #include <linux/icmpv6.h>
  43 #include <linux/netfilter_ipv6.h>
  44
  45 #include <net/ip.h>
  46 #include <net/ipv6.h>
  47 #include <net/udp.h>
  48 #include <net/udplite.h>
  49 #include <net/tcp.h>
  50 #include <net/ipip.h>
  51 #include <net/protocol.h>
  52 #include <net/inet_common.h>
  53 #include <net/route.h>
  54 #include <net/transp_v6.h>
  55 #include <net/ip6_route.h>
  56 #include <net/addrconf.h>
  57 #ifdef CONFIG_IPV6_TUNNEL
  58 #include <net/ip6_tunnel.h>
  59 #endif
  60
  61 #include <asm/uaccess.h>
  62 #include <asm/system.h>
  63 #include <linux/mroute6.h>
  64
  65 MODULE_AUTHOR("Cast of dozens");
  66 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
  67 MODULE_LICENSE("GPL");
  68
  69 /* The inetsw6 table contains everything that inet6_create needs to
  70  * build a new socket.
  71  */
  72 static struct list_head inetsw6[SOCK_MAX];
  73 static DEFINE_SPINLOCK(inetsw6_lock);
  74
  75 struct ipv6_params ipv6_defaults = {
  76         .disable_ipv6 = 0,
  77         .autoconf = 1,
  78 };
  79
  80 static int disable_ipv6_mod = 0;
  81
  82 module_param_named(disable, disable_ipv6_mod, int, 0444);
  83 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
  84
  85 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
  86 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
  87
  88 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
  89 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
  90
  91 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
  92 {
  93         const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
  94
  95         return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
  96 }
  97
  98 static int inet6_create(struct net *net, struct socket *sock, int protocol)
  99 {
 100         struct inet_sock *inet;
 101         struct ipv6_pinfo *np;
 102         struct sock *sk;
 103         struct inet_protosw *answer;
 104         struct proto *answer_prot;
 105         unsigned char answer_flags;
 106         char answer_no_check;
 107         int try_loading_module = 0;
 108         int err;
 109
 110         if (sock->type != SOCK_RAW &&
 111             sock->type != SOCK_DGRAM &&
 112             !inet_ehash_secret)
 113                 build_ehash_secret();
 114
 115         /* Look for the requested type/protocol pair. */
 116 lookup_protocol:
 117         err = -ESOCKTNOSUPPORT;
 118         rcu_read_lock();
 119         list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
 120
 121                 err = 0;
 122                 /* Check the non-wild match. */
 123                 if (protocol == answer->protocol) {
 124                         if (protocol != IPPROTO_IP)
 125                                 break;
 126                 } else {
 127                         /* Check for the two wild cases. */
 128                         if (IPPROTO_IP == protocol) {
 129                                 protocol = answer->protocol;
 130                                 break;
 131                         }
 132                         if (IPPROTO_IP == answer->protocol)
 133                                 break;
 134                 }
 135                 err = -EPROTONOSUPPORT;
 136         }
 137
 138         if (err) {
 139                 if (try_loading_module < 2) {
 140                         rcu_read_unlock();
 141                         /*
 142                          * Be more specific, e.g. net-pf-10-proto-132-type-1
 143                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
 144                          */
 145                         if (++try_loading_module == 1)
 146                                 request_module("net-pf-%d-proto-%d-type-%d",
 147                                                 PF_INET6, protocol, sock->type);
 148                         /*
 149                          * Fall back to generic, e.g. net-pf-10-proto-132
 150                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
 151                          */
 152                         else
 153                                 request_module("net-pf-%d-proto-%d",
 154                                                 PF_INET6, protocol);
 155                         goto lookup_protocol;
 156                 } else
 157                         goto out_rcu_unlock;
 158         }
 159
 160         err = -EPERM;
 161         if (sock->type == SOCK_RAW && !capable(CAP_NET_RAW))
 162                 goto out_rcu_unlock;
 163
 164         sock->ops = answer->ops;
 165         answer_prot = answer->prot;
 166         answer_no_check = answer->no_check;
 167         answer_flags = answer->flags;
 168         rcu_read_unlock();
 169
 170         WARN_ON(answer_prot->slab == NULL);
 171
 172         err = -ENOBUFS;
 173         sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot);
 174         if (sk == NULL)
 175                 goto out;
 176
 177         sock_init_data(sock, sk);
 178
 179         err = 0;
 180         sk->sk_no_check = answer_no_check;
 181         if (INET_PROTOSW_REUSE & answer_flags)
 182                 sk->sk_reuse = 1;
 183
 184         inet = inet_sk(sk);
 185         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
 186
 187         if (SOCK_RAW == sock->type) {
 188                 inet->inet_num = protocol;
 189                 if (IPPROTO_RAW == protocol)
 190                         inet->hdrincl = 1;
 191         }
 192
 193         sk->sk_destruct         = inet_sock_destruct;
 194         sk->sk_family           = PF_INET6;
 195         sk->sk_protocol         = protocol;
 196
 197         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
 198
 199         inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
 200         np->hop_limit   = -1;
 201         np->mcast_hops  = -1;
 202         np->mc_loop     = 1;
 203         np->pmtudisc    = IPV6_PMTUDISC_WANT;
 204         np->ipv6only    = net->ipv6.sysctl.bindv6only;
 205
 206         /* Init the ipv4 part of the socket since we can have sockets
 207          * using v6 API for ipv4.
 208          */
 209         inet->uc_ttl    = -1;
 210
 211         inet->mc_loop   = 1;
 212         inet->mc_ttl    = 1;
 213         inet->mc_index  = 0;
 214         inet->mc_list   = NULL;
 215
 216         if (ipv4_config.no_pmtu_disc)
 217                 inet->pmtudisc = IP_PMTUDISC_DONT;
 218         else
 219                 inet->pmtudisc = IP_PMTUDISC_WANT;
 220         /*
 221          * Increment only the relevant sk_prot->socks debug field, this changes
 222          * the previous behaviour of incrementing both the equivalent to
 223          * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
 224          *
 225          * This allows better debug granularity as we'll know exactly how many
 226          * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
 227          * transport protocol socks. -acme
 228          */
 229         sk_refcnt_debug_inc(sk);
 230
 231         if (inet->inet_num) {
 232                 /* It assumes that any protocol which allows
 233                  * the user to assign a number at socket
 234                  * creation time automatically shares.
 235                  */
 236                 inet->inet_sport = htons(inet->inet_num);
 237                 sk->sk_prot->hash(sk);
 238         }
 239         if (sk->sk_prot->init) {
 240                 err = sk->sk_prot->init(sk);
 241                 if (err) {
 242                         sk_common_release(sk);
 243                         goto out;
 244                 }
 245         }
 246 out:
 247         return err;
 248 out_rcu_unlock:
 249         rcu_read_unlock();
 250         goto out;
 251 }
 252
 253
 254 /* bind for INET6 API */
 255 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 256 {
 257         struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
 258         struct sock *sk = sock->sk;
 259         struct inet_sock *inet = inet_sk(sk);
 260         struct ipv6_pinfo *np = inet6_sk(sk);
 261         struct net *net = sock_net(sk);
 262         __be32 v4addr = 0;
 263         unsigned short snum;
 264         int addr_type = 0;
 265         int err = 0;
 266
 267         /* If the socket has its own bind function then use it. */
 268         if (sk->sk_prot->bind)
 269                 return sk->sk_prot->bind(sk, uaddr, addr_len);
 270
 271         if (addr_len < SIN6_LEN_RFC2133)
 272                 return -EINVAL;
 273         addr_type = ipv6_addr_type(&addr->sin6_addr);
 274         if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
 275                 return -EINVAL;
 276
 277         snum = ntohs(addr->sin6_port);
 278         if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
 279                 return -EACCES;
 280
 281         lock_sock(sk);
 282
 283         /* Check these errors (active socket, double bind). */
 284         if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
 285                 err = -EINVAL;
 286                 goto out;
 287         }
 288
 289         /* Check if the address belongs to the host. */
 290         if (addr_type == IPV6_ADDR_MAPPED) {
 291                 int chk_addr_ret;
 292
 293                 /* Binding to v4-mapped address on a v6-only socket
 294                  * makes no sense
 295                  */
 296                 if (np->ipv6only) {
 297                         err = -EINVAL;
 298                         goto out;
 299                 }
 300
 301                 /* Reproduce AF_INET checks to make the bindings consitant */
 302                 v4addr = addr->sin6_addr.s6_addr32[3];
 303                 chk_addr_ret = inet_addr_type(net, v4addr);
 304                 if (!sysctl_ip_nonlocal_bind &&
 305                     !(inet->freebind || inet->transparent) &&
 306                     v4addr != htonl(INADDR_ANY) &&
 307                     chk_addr_ret != RTN_LOCAL &&
 308                     chk_addr_ret != RTN_MULTICAST &&
 309                     chk_addr_ret != RTN_BROADCAST) {
 310                         err = -EADDRNOTAVAIL;
 311                         goto out;
 312                 }
 313         } else {
 314                 if (addr_type != IPV6_ADDR_ANY) {
 315                         struct net_device *dev = NULL;
 316
 317                         rcu_read_lock();
 318                         if (addr_type & IPV6_ADDR_LINKLOCAL) {
 319                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 320                                     addr->sin6_scope_id) {
 321                                         /* Override any existing binding, if another one
 322                                          * is supplied by user.
 323                                          */
 324                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
 325                                 }
 326
 327                                 /* Binding to link-local address requires an interface */
 328                                 if (!sk->sk_bound_dev_if) {
 329                                         err = -EINVAL;
 330                                         goto out_unlock;
 331                                 }
 332                                 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
 333                                 if (!dev) {
 334                                         err = -ENODEV;
 335                                         goto out_unlock;
 336                                 }
 337                         }
 338
 339                         /* ipv4 addr of the socket is invalid.  Only the
 340                          * unspecified and mapped address have a v4 equivalent.
 341                          */
 342                         v4addr = LOOPBACK4_IPV6;
 343                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
 344                                 if (!ipv6_chk_addr(net, &addr->sin6_addr,
 345                                                    dev, 0)) {
 346                                         err = -EADDRNOTAVAIL;
 347                                         goto out_unlock;
 348                                 }
 349                         }
 350                         rcu_read_unlock();
 351                 }
 352         }
 353
 354         inet->inet_rcv_saddr = v4addr;
 355         inet->inet_saddr = v4addr;
 356
 357         ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
 358
 359         if (!(addr_type & IPV6_ADDR_MULTICAST))
 360                 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
 361
 362         /* Make sure we are allowed to bind here. */
 363         if (sk->sk_prot->get_port(sk, snum)) {
 364                 inet_reset_saddr(sk);
 365                 err = -EADDRINUSE;
 366                 goto out;
 367         }
 368
 369         if (addr_type != IPV6_ADDR_ANY) {
 370                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
 371                 if (addr_type != IPV6_ADDR_MAPPED)
 372                         np->ipv6only = 1;
 373         }
 374         if (snum)
 375                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
 376         inet->inet_sport = htons(inet->inet_num);
 377         inet->inet_dport = 0;
 378         inet->inet_daddr = 0;
 379 out:
 380         release_sock(sk);
 381         return err;
 382 out_unlock:
 383         rcu_read_unlock();
 384         goto out;
 385 }
 386
 387 EXPORT_SYMBOL(inet6_bind);
 388
 389 int inet6_release(struct socket *sock)
 390 {
 391         struct sock *sk = sock->sk;
 392
 393         if (sk == NULL)
 394                 return -EINVAL;
 395
 396         /* Free mc lists */
 397         ipv6_sock_mc_close(sk);
 398
 399         /* Free ac lists */
 400         ipv6_sock_ac_close(sk);
 401
 402         return inet_release(sock);
 403 }
 404
 405 EXPORT_SYMBOL(inet6_release);
 406
 407 void inet6_destroy_sock(struct sock *sk)
 408 {
 409         struct ipv6_pinfo *np = inet6_sk(sk);
 410         struct sk_buff *skb;
 411         struct ipv6_txoptions *opt;
 412
 413         /* Release rx options */
 414
 415         if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
 416                 kfree_skb(skb);
 417
 418         /* Free flowlabels */
 419         fl6_free_socklist(sk);
 420
 421         /* Free tx options */
 422
 423         if ((opt = xchg(&np->opt, NULL)) != NULL)
 424                 sock_kfree_s(sk, opt, opt->tot_len);
 425 }
 426
 427 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
 428
 429 /*
 430  *      This does both peername and sockname.
 431  */
 432
 433 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 434                  int *uaddr_len, int peer)
 435 {
 436         struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
 437         struct sock *sk = sock->sk;
 438         struct inet_sock *inet = inet_sk(sk);
 439         struct ipv6_pinfo *np = inet6_sk(sk);
 440
 441         sin->sin6_family = AF_INET6;
 442         sin->sin6_flowinfo = 0;
 443         sin->sin6_scope_id = 0;
 444         if (peer) {
 445                 if (!inet->inet_dport)
 446                         return -ENOTCONN;
 447                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
 448                     peer == 1)
 449                         return -ENOTCONN;
 450                 sin->sin6_port = inet->inet_dport;
 451                 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
 452                 if (np->sndflow)
 453                         sin->sin6_flowinfo = np->flow_label;
 454         } else {
 455                 if (ipv6_addr_any(&np->rcv_saddr))
 456                         ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
 457                 else
 458                         ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
 459
 460                 sin->sin6_port = inet->inet_sport;
 461         }
 462         if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
 463                 sin->sin6_scope_id = sk->sk_bound_dev_if;
 464         *uaddr_len = sizeof(*sin);
 465         return(0);
 466 }
 467
 468 EXPORT_SYMBOL(inet6_getname);
 469
 470 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 471 {
 472         struct sock *sk = sock->sk;
 473         struct net *net = sock_net(sk);
 474
 475         switch(cmd)
 476         {
 477         case SIOCGSTAMP:
 478                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
 479
 480         case SIOCGSTAMPNS:
 481                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
 482
 483         case SIOCADDRT:
 484         case SIOCDELRT:
 485
 486                 return(ipv6_route_ioctl(net, cmd, (void __user *)arg));
 487
 488         case SIOCSIFADDR:
 489                 return addrconf_add_ifaddr(net, (void __user *) arg);
 490         case SIOCDIFADDR:
 491                 return addrconf_del_ifaddr(net, (void __user *) arg);
 492         case SIOCSIFDSTADDR:
 493                 return addrconf_set_dstaddr(net, (void __user *) arg);
 494         default:
 495                 if (!sk->sk_prot->ioctl)
 496                         return -ENOIOCTLCMD;
 497                 return sk->sk_prot->ioctl(sk, cmd, arg);
 498         }
 499         /*NOTREACHED*/
 500         return(0);
 501 }
 502
 503 EXPORT_SYMBOL(inet6_ioctl);
 504
 505 const struct proto_ops inet6_stream_ops = {
 506         .family            = PF_INET6,
 507         .owner             = THIS_MODULE,
 508         .release           = inet6_release,
 509         .bind              = inet6_bind,
 510         .connect           = inet_stream_connect,       /* ok           */
 511         .socketpair        = sock_no_socketpair,        /* a do nothing */
 512         .accept            = inet_accept,               /* ok           */
 513         .getname           = inet6_getname,
 514         .poll              = tcp_poll,                  /* ok           */
 515         .ioctl             = inet6_ioctl,               /* must change  */
 516         .listen            = inet_listen,               /* ok           */
 517         .shutdown          = inet_shutdown,             /* ok           */
 518         .setsockopt        = sock_common_setsockopt,    /* ok           */
 519         .getsockopt        = sock_common_getsockopt,    /* ok           */
 520         .sendmsg           = tcp_sendmsg,               /* ok           */
 521         .recvmsg           = sock_common_recvmsg,       /* ok           */
 522         .mmap              = sock_no_mmap,
 523         .sendpage          = tcp_sendpage,
 524         .splice_read       = tcp_splice_read,
 525 #ifdef CONFIG_COMPAT
 526         .compat_setsockopt = compat_sock_common_setsockopt,
 527         .compat_getsockopt = compat_sock_common_getsockopt,
 528 #endif
 529 };
 530
 531 const struct proto_ops inet6_dgram_ops = {
 532         .family            = PF_INET6,
 533         .owner             = THIS_MODULE,
 534         .release           = inet6_release,
 535         .bind              = inet6_bind,
 536         .connect           = inet_dgram_connect,        /* ok           */
 537         .socketpair        = sock_no_socketpair,        /* a do nothing */
 538         .accept            = sock_no_accept,            /* a do nothing */
 539         .getname           = inet6_getname,
 540         .poll              = udp_poll,                  /* ok           */
 541         .ioctl             = inet6_ioctl,               /* must change  */
 542         .listen            = sock_no_listen,            /* ok           */
 543         .shutdown          = inet_shutdown,             /* ok           */
 544         .setsockopt        = sock_common_setsockopt,    /* ok           */
 545         .getsockopt        = sock_common_getsockopt,    /* ok           */
 546         .sendmsg           = inet_sendmsg,              /* ok           */
 547         .recvmsg           = sock_common_recvmsg,       /* ok           */
 548         .mmap              = sock_no_mmap,
 549         .sendpage          = sock_no_sendpage,
 550 #ifdef CONFIG_COMPAT
 551         .compat_setsockopt = compat_sock_common_setsockopt,
 552         .compat_getsockopt = compat_sock_common_getsockopt,
 553 #endif
 554 };
 555
 556 static const struct net_proto_family inet6_family_ops = {
 557         .family = PF_INET6,
 558         .create = inet6_create,
 559         .owner  = THIS_MODULE,
 560 };
 561
 562 int inet6_register_protosw(struct inet_protosw *p)
 563 {
 564         struct list_head *lh;
 565         struct inet_protosw *answer;
 566         struct list_head *last_perm;
 567         int protocol = p->protocol;
 568         int ret;
 569
 570         spin_lock_bh(&inetsw6_lock);
 571
 572         ret = -EINVAL;
 573         if (p->type >= SOCK_MAX)
 574                 goto out_illegal;
 575
 576         /* If we are trying to override a permanent protocol, bail. */
 577         answer = NULL;
 578         ret = -EPERM;
 579         last_perm = &inetsw6[p->type];
 580         list_for_each(lh, &inetsw6[p->type]) {
 581                 answer = list_entry(lh, struct inet_protosw, list);
 582
 583                 /* Check only the non-wild match. */
 584                 if (INET_PROTOSW_PERMANENT & answer->flags) {
 585                         if (protocol == answer->protocol)
 586                                 break;
 587                         last_perm = lh;
 588                 }
 589
 590                 answer = NULL;
 591         }
 592         if (answer)
 593                 goto out_permanent;
 594
 595         /* Add the new entry after the last permanent entry if any, so that
 596          * the new entry does not override a permanent entry when matched with
 597          * a wild-card protocol. But it is allowed to override any existing
 598          * non-permanent entry.  This means that when we remove this entry, the
 599          * system automatically returns to the old behavior.
 600          */
 601         list_add_rcu(&p->list, last_perm);
 602         ret = 0;
 603 out:
 604         spin_unlock_bh(&inetsw6_lock);
 605         return ret;
 606
 607 out_permanent:
 608         printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
 609                protocol);
 610         goto out;
 611
 612 out_illegal:
 613         printk(KERN_ERR
 614                "Ignoring attempt to register invalid socket type %d.\n",
 615                p->type);
 616         goto out;
 617 }
 618
 619 EXPORT_SYMBOL(inet6_register_protosw);
 620
 621 void
 622 inet6_unregister_protosw(struct inet_protosw *p)
 623 {
 624         if (INET_PROTOSW_PERMANENT & p->flags) {
 625                 printk(KERN_ERR
 626                        "Attempt to unregister permanent protocol %d.\n",
 627                        p->protocol);
 628         } else {
 629                 spin_lock_bh(&inetsw6_lock);
 630                 list_del_rcu(&p->list);
 631                 spin_unlock_bh(&inetsw6_lock);
 632
 633                 synchronize_net();
 634         }
 635 }
 636
 637 EXPORT_SYMBOL(inet6_unregister_protosw);
 638
 639 int inet6_sk_rebuild_header(struct sock *sk)
 640 {
 641         int err;
 642         struct dst_entry *dst;
 643         struct ipv6_pinfo *np = inet6_sk(sk);
 644
 645         dst = __sk_dst_check(sk, np->dst_cookie);
 646
 647         if (dst == NULL) {
 648                 struct inet_sock *inet = inet_sk(sk);
 649                 struct in6_addr *final_p = NULL, final;
 650                 struct flowi fl;
 651
 652                 memset(&fl, 0, sizeof(fl));
 653                 fl.proto = sk->sk_protocol;
 654                 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 655                 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
 656                 fl.fl6_flowlabel = np->flow_label;
 657                 fl.oif = sk->sk_bound_dev_if;
 658                 fl.mark = sk->sk_mark;
 659                 fl.fl_ip_dport = inet->inet_dport;
 660                 fl.fl_ip_sport = inet->inet_sport;
 661                 security_sk_classify_flow(sk, &fl);
 662
 663                 if (np->opt && np->opt->srcrt) {
 664                         struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
 665                         ipv6_addr_copy(&final, &fl.fl6_dst);
 666                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 667                         final_p = &final;
 668                 }
 669
 670                 err = ip6_dst_lookup(sk, &dst, &fl);
 671                 if (err) {
 672                         sk->sk_route_caps = 0;
 673                         return err;
 674                 }
 675                 if (final_p)
 676                         ipv6_addr_copy(&fl.fl6_dst, final_p);
 677
 678                 if ((err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0) {
 679                         sk->sk_err_soft = -err;
 680                         return err;
 681                 }
 682
 683                 __ip6_dst_store(sk, dst, NULL, NULL);
 684         }
 685
 686         return 0;
 687 }
 688
 689 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
 690
 691 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
 692 {
 693         struct ipv6_pinfo *np = inet6_sk(sk);
 694         struct inet6_skb_parm *opt = IP6CB(skb);
 695
 696         if (np->rxopt.all) {
 697                 if ((opt->hop && (np->rxopt.bits.hopopts ||
 698                                   np->rxopt.bits.ohopopts)) ||
 699                     ((IPV6_FLOWINFO_MASK &
 700                       *(__be32 *)skb_network_header(skb)) &&
 701                      np->rxopt.bits.rxflow) ||
 702                     (opt->srcrt && (np->rxopt.bits.srcrt ||
 703                      np->rxopt.bits.osrcrt)) ||
 704                     ((opt->dst1 || opt->dst0) &&
 705                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
 706                         return 1;
 707         }
 708         return 0;
 709 }
 710
 711 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
 712
 713 static int ipv6_gso_pull_exthdrs(struct sk_buff *skb, int proto)
 714 {
 715         const struct inet6_protocol *ops = NULL;
 716
 717         for (;;) {
 718                 struct ipv6_opt_hdr *opth;
 719                 int len;
 720
 721                 if (proto != NEXTHDR_HOP) {
 722                         ops = rcu_dereference(inet6_protos[proto]);
 723
 724                         if (unlikely(!ops))
 725                                 break;
 726
 727                         if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
 728                                 break;
 729                 }
 730
 731                 if (unlikely(!pskb_may_pull(skb, 8)))
 732                         break;
 733
 734                 opth = (void *)skb->data;
 735                 len = ipv6_optlen(opth);
 736
 737                 if (unlikely(!pskb_may_pull(skb, len)))
 738                         break;
 739
 740                 proto = opth->nexthdr;
 741                 __skb_pull(skb, len);
 742         }
 743
 744         return proto;
 745 }
 746
 747 static int ipv6_gso_send_check(struct sk_buff *skb)
 748 {
 749         struct ipv6hdr *ipv6h;
 750         const struct inet6_protocol *ops;
 751         int err = -EINVAL;
 752
 753         if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
 754                 goto out;
 755
 756         ipv6h = ipv6_hdr(skb);
 757         __skb_pull(skb, sizeof(*ipv6h));
 758         err = -EPROTONOSUPPORT;
 759
 760         rcu_read_lock();
 761         ops = rcu_dereference(inet6_protos[
 762                 ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]);
 763
 764         if (likely(ops && ops->gso_send_check)) {
 765                 skb_reset_transport_header(skb);
 766                 err = ops->gso_send_check(skb);
 767         }
 768         rcu_read_unlock();
 769
 770 out:
 771         return err;
 772 }
 773
 774 static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features)
 775 {
 776         struct sk_buff *segs = ERR_PTR(-EINVAL);
 777         struct ipv6hdr *ipv6h;
 778         const struct inet6_protocol *ops;
 779         int proto;
 780         struct frag_hdr *fptr;
 781         unsigned int unfrag_ip6hlen;
 782         u8 *prevhdr;
 783         int offset = 0;
 784
 785         if (!(features & NETIF_F_V6_CSUM))
 786                 features &= ~NETIF_F_SG;
 787
 788         if (unlikely(skb_shinfo(skb)->gso_type &
 789                      ~(SKB_GSO_UDP |
 790                        SKB_GSO_DODGY |
 791                        SKB_GSO_TCP_ECN |
 792                        SKB_GSO_TCPV6 |
 793                        0)))
 794                 goto out;
 795
 796         if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
 797                 goto out;
 798
 799         ipv6h = ipv6_hdr(skb);
 800         __skb_pull(skb, sizeof(*ipv6h));
 801         segs = ERR_PTR(-EPROTONOSUPPORT);
 802
 803         proto = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
 804         rcu_read_lock();
 805         ops = rcu_dereference(inet6_protos[proto]);
 806         if (likely(ops && ops->gso_segment)) {
 807                 skb_reset_transport_header(skb);
 808                 segs = ops->gso_segment(skb, features);
 809         }
 810         rcu_read_unlock();
 811
 812         if (unlikely(IS_ERR(segs)))
 813                 goto out;
 814
 815         for (skb = segs; skb; skb = skb->next) {
 816                 ipv6h = ipv6_hdr(skb);
 817                 ipv6h->payload_len = htons(skb->len - skb->mac_len -
 818                                            sizeof(*ipv6h));
 819                 if (proto == IPPROTO_UDP) {
 820                         unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
 821                         fptr = (struct frag_hdr *)(skb_network_header(skb) +
 822                                 unfrag_ip6hlen);
 823                         fptr->frag_off = htons(offset);
 824                         if (skb->next != NULL)
 825                                 fptr->frag_off |= htons(IP6_MF);
 826                         offset += (ntohs(ipv6h->payload_len) -
 827                                    sizeof(struct frag_hdr));
 828                 }
 829         }
 830
 831 out:
 832         return segs;
 833 }
 834
 835 struct ipv6_gro_cb {
 836         struct napi_gro_cb napi;
 837         int proto;
 838 };
 839
 840 #define IPV6_GRO_CB(skb) ((struct ipv6_gro_cb *)(skb)->cb)
 841
 842 static struct sk_buff **ipv6_gro_receive(struct sk_buff **head,
 843                                          struct sk_buff *skb)
 844 {
 845         const struct inet6_protocol *ops;
 846         struct sk_buff **pp = NULL;
 847         struct sk_buff *p;
 848         struct ipv6hdr *iph;
 849         unsigned int nlen;
 850         unsigned int hlen;
 851         unsigned int off;
 852         int flush = 1;
 853         int proto;
 854         __wsum csum;
 855
 856         off = skb_gro_offset(skb);
 857         hlen = off + sizeof(*iph);
 858         iph = skb_gro_header_fast(skb, off);
 859         if (skb_gro_header_hard(skb, hlen)) {
 860                 iph = skb_gro_header_slow(skb, hlen, off);
 861                 if (unlikely(!iph))
 862                         goto out;
 863         }
 864
 865         skb_gro_pull(skb, sizeof(*iph));
 866         skb_set_transport_header(skb, skb_gro_offset(skb));
 867
 868         flush += ntohs(iph->payload_len) != skb_gro_len(skb);
 869
 870         rcu_read_lock();
 871         proto = iph->nexthdr;
 872         ops = rcu_dereference(inet6_protos[proto]);
 873         if (!ops || !ops->gro_receive) {
 874                 __pskb_pull(skb, skb_gro_offset(skb));
 875                 proto = ipv6_gso_pull_exthdrs(skb, proto);
 876                 skb_gro_pull(skb, -skb_transport_offset(skb));
 877                 skb_reset_transport_header(skb);
 878                 __skb_push(skb, skb_gro_offset(skb));
 879
 880                 if (!ops || !ops->gro_receive)
 881                         goto out_unlock;
 882
 883                 iph = ipv6_hdr(skb);
 884         }
 885
 886         IPV6_GRO_CB(skb)->proto = proto;
 887
 888         flush--;
 889         nlen = skb_network_header_len(skb);
 890
 891         for (p = *head; p; p = p->next) {
 892                 struct ipv6hdr *iph2;
 893
 894                 if (!NAPI_GRO_CB(p)->same_flow)
 895                         continue;
 896
 897                 iph2 = ipv6_hdr(p);
 898
 899                 /* All fields must match except length. */
 900                 if (nlen != skb_network_header_len(p) ||
 901                     memcmp(iph, iph2, offsetof(struct ipv6hdr, payload_len)) ||
 902                     memcmp(&iph->nexthdr, &iph2->nexthdr,
 903                            nlen - offsetof(struct ipv6hdr, nexthdr))) {
 904                         NAPI_GRO_CB(p)->same_flow = 0;
 905                         continue;
 906                 }
 907
 908                 NAPI_GRO_CB(p)->flush |= flush;
 909         }
 910
 911         NAPI_GRO_CB(skb)->flush |= flush;
 912
 913         csum = skb->csum;
 914         skb_postpull_rcsum(skb, iph, skb_network_header_len(skb));
 915
 916         pp = ops->gro_receive(head, skb);
 917
 918         skb->csum = csum;
 919
 920 out_unlock:
 921         rcu_read_unlock();
 922
 923 out:
 924         NAPI_GRO_CB(skb)->flush |= flush;
 925
 926         return pp;
 927 }
 928
 929 static int ipv6_gro_complete(struct sk_buff *skb)
 930 {
 931         const struct inet6_protocol *ops;
 932         struct ipv6hdr *iph = ipv6_hdr(skb);
 933         int err = -ENOSYS;
 934
 935         iph->payload_len = htons(skb->len - skb_network_offset(skb) -
 936                                  sizeof(*iph));
 937
 938         rcu_read_lock();
 939         ops = rcu_dereference(inet6_protos[IPV6_GRO_CB(skb)->proto]);
 940         if (WARN_ON(!ops || !ops->gro_complete))
 941                 goto out_unlock;
 942
 943         err = ops->gro_complete(skb);
 944
 945 out_unlock:
 946         rcu_read_unlock();
 947
 948         return err;
 949 }
 950
 951 static struct packet_type ipv6_packet_type __read_mostly = {
 952         .type = cpu_to_be16(ETH_P_IPV6),
 953         .func = ipv6_rcv,
 954         .gso_send_check = ipv6_gso_send_check,
 955         .gso_segment = ipv6_gso_segment,
 956         .gro_receive = ipv6_gro_receive,
 957         .gro_complete = ipv6_gro_complete,
 958 };
 959
 960 static int __init ipv6_packet_init(void)
 961 {
 962         dev_add_pack(&ipv6_packet_type);
 963         return 0;
 964 }
 965
 966 static void ipv6_packet_cleanup(void)
 967 {
 968         dev_remove_pack(&ipv6_packet_type);
 969 }
 970
 971 static int __net_init ipv6_init_mibs(struct net *net)
 972 {
 973         if (snmp_mib_init((void **)net->mib.udp_stats_in6,
 974                           sizeof (struct udp_mib)) < 0)
 975                 return -ENOMEM;
 976         if (snmp_mib_init((void **)net->mib.udplite_stats_in6,
 977                           sizeof (struct udp_mib)) < 0)
 978                 goto err_udplite_mib;
 979         if (snmp_mib_init((void **)net->mib.ipv6_statistics,
 980                           sizeof(struct ipstats_mib)) < 0)
 981                 goto err_ip_mib;
 982         if (snmp_mib_init((void **)net->mib.icmpv6_statistics,
 983                           sizeof(struct icmpv6_mib)) < 0)
 984                 goto err_icmp_mib;
 985         if (snmp_mib_init((void **)net->mib.icmpv6msg_statistics,
 986                           sizeof(struct icmpv6msg_mib)) < 0)
 987                 goto err_icmpmsg_mib;
 988         return 0;
 989
 990 err_icmpmsg_mib:
 991         snmp_mib_free((void **)net->mib.icmpv6_statistics);
 992 err_icmp_mib:
 993         snmp_mib_free((void **)net->mib.ipv6_statistics);
 994 err_ip_mib:
 995         snmp_mib_free((void **)net->mib.udplite_stats_in6);
 996 err_udplite_mib:
 997         snmp_mib_free((void **)net->mib.udp_stats_in6);
 998         return -ENOMEM;
 999 }
1000
1001 static void __net_exit ipv6_cleanup_mibs(struct net *net)
1002 {
1003         snmp_mib_free((void **)net->mib.udp_stats_in6);
1004         snmp_mib_free((void **)net->mib.udplite_stats_in6);
1005         snmp_mib_free((void **)net->mib.ipv6_statistics);
1006         snmp_mib_free((void **)net->mib.icmpv6_statistics);
1007         snmp_mib_free((void **)net->mib.icmpv6msg_statistics);
1008 }
1009
1010 static int __net_init inet6_net_init(struct net *net)
1011 {
1012         int err = 0;
1013
1014         net->ipv6.sysctl.bindv6only = 0;
1015         net->ipv6.sysctl.icmpv6_time = 1*HZ;
1016
1017         err = ipv6_init_mibs(net);
1018         if (err)
1019                 return err;
1020 #ifdef CONFIG_PROC_FS
1021         err = udp6_proc_init(net);
1022         if (err)
1023                 goto out;
1024         err = tcp6_proc_init(net);
1025         if (err)
1026                 goto proc_tcp6_fail;
1027         err = ac6_proc_init(net);
1028         if (err)
1029                 goto proc_ac6_fail;
1030 #endif
1031         return err;
1032
1033 #ifdef CONFIG_PROC_FS
1034 proc_ac6_fail:
1035         tcp6_proc_exit(net);
1036 proc_tcp6_fail:
1037         udp6_proc_exit(net);
1038 out:
1039         ipv6_cleanup_mibs(net);
1040         return err;
1041 #endif
1042 }
1043
1044 static void inet6_net_exit(struct net *net)
1045 {
1046 #ifdef CONFIG_PROC_FS
1047         udp6_proc_exit(net);
1048         tcp6_proc_exit(net);
1049         ac6_proc_exit(net);
1050 #endif
1051         ipv6_cleanup_mibs(net);
1052 }
1053
1054 static struct pernet_operations inet6_net_ops = {
1055         .init = inet6_net_init,
1056         .exit = inet6_net_exit,
1057 };
1058
1059 static int __init inet6_init(void)
1060 {
1061         struct sk_buff *dummy_skb;
1062         struct list_head *r;
1063         int err = 0;
1064
1065         BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
1066
1067         /* Register the socket-side information for inet6_create.  */
1068         for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
1069                 INIT_LIST_HEAD(r);
1070
1071         if (disable_ipv6_mod) {
1072                 printk(KERN_INFO
1073                        "IPv6: Loaded, but administratively disabled, "
1074                        "reboot required to enable\n");
1075                 goto out;
1076         }
1077
1078         err = proto_register(&tcpv6_prot, 1);
1079         if (err)
1080                 goto out;
1081
1082         err = proto_register(&udpv6_prot, 1);
1083         if (err)
1084                 goto out_unregister_tcp_proto;
1085
1086         err = proto_register(&udplitev6_prot, 1);
1087         if (err)
1088                 goto out_unregister_udp_proto;
1089
1090         err = proto_register(&rawv6_prot, 1);
1091         if (err)
1092                 goto out_unregister_udplite_proto;
1093
1094
1095         /* We MUST register RAW sockets before we create the ICMP6,
1096          * IGMP6, or NDISC control sockets.
1097          */
1098         err = rawv6_init();
1099         if (err)
1100                 goto out_unregister_raw_proto;
1101
1102         /* Register the family here so that the init calls below will
1103          * be able to create sockets. (?? is this dangerous ??)
1104          */
1105         err = sock_register(&inet6_family_ops);
1106         if (err)
1107                 goto out_sock_register_fail;
1108
1109 #ifdef CONFIG_SYSCTL
1110         err = ipv6_static_sysctl_register();
1111         if (err)
1112                 goto static_sysctl_fail;
1113 #endif
1114         /*
1115          *      ipngwg API draft makes clear that the correct semantics
1116          *      for TCP and UDP is to consider one TCP and UDP instance
1117          *      in a host availiable by both INET and INET6 APIs and
1118          *      able to communicate via both network protocols.
1119          */
1120
1121         err = register_pernet_subsys(&inet6_net_ops);
1122         if (err)
1123                 goto register_pernet_fail;
1124         err = icmpv6_init();
1125         if (err)
1126                 goto icmp_fail;
1127         err = ip6_mr_init();
1128         if (err)
1129                 goto ipmr_fail;
1130         err = ndisc_init();
1131         if (err)
1132                 goto ndisc_fail;
1133         err = igmp6_init();
1134         if (err)
1135                 goto igmp_fail;
1136         err = ipv6_netfilter_init();
1137         if (err)
1138                 goto netfilter_fail;
1139         /* Create /proc/foo6 entries. */
1140 #ifdef CONFIG_PROC_FS
1141         err = -ENOMEM;
1142         if (raw6_proc_init())
1143                 goto proc_raw6_fail;
1144         if (udplite6_proc_init())
1145                 goto proc_udplite6_fail;
1146         if (ipv6_misc_proc_init())
1147                 goto proc_misc6_fail;
1148         if (if6_proc_init())
1149                 goto proc_if6_fail;
1150 #endif
1151         err = ip6_route_init();
1152         if (err)
1153                 goto ip6_route_fail;
1154         err = ip6_flowlabel_init();
1155         if (err)
1156                 goto ip6_flowlabel_fail;
1157         err = addrconf_init();
1158         if (err)
1159                 goto addrconf_fail;
1160
1161         /* Init v6 extension headers. */
1162         err = ipv6_exthdrs_init();
1163         if (err)
1164                 goto ipv6_exthdrs_fail;
1165
1166         err = ipv6_frag_init();
1167         if (err)
1168                 goto ipv6_frag_fail;
1169
1170         /* Init v6 transport protocols. */
1171         err = udpv6_init();
1172         if (err)
1173                 goto udpv6_fail;
1174
1175         err = udplitev6_init();
1176         if (err)
1177                 goto udplitev6_fail;
1178
1179         err = tcpv6_init();
1180         if (err)
1181                 goto tcpv6_fail;
1182
1183         err = ipv6_packet_init();
1184         if (err)
1185                 goto ipv6_packet_fail;
1186
1187 #ifdef CONFIG_SYSCTL
1188         err = ipv6_sysctl_register();
1189         if (err)
1190                 goto sysctl_fail;
1191 #endif
1192 out:
1193         return err;
1194
1195 #ifdef CONFIG_SYSCTL
1196 sysctl_fail:
1197         ipv6_packet_cleanup();
1198 #endif
1199 ipv6_packet_fail:
1200         tcpv6_exit();
1201 tcpv6_fail:
1202         udplitev6_exit();
1203 udplitev6_fail:
1204         udpv6_exit();
1205 udpv6_fail:
1206         ipv6_frag_exit();
1207 ipv6_frag_fail:
1208         ipv6_exthdrs_exit();
1209 ipv6_exthdrs_fail:
1210         addrconf_cleanup();
1211 addrconf_fail:
1212         ip6_flowlabel_cleanup();
1213 ip6_flowlabel_fail:
1214         ip6_route_cleanup();
1215 ip6_route_fail:
1216 #ifdef CONFIG_PROC_FS
1217         if6_proc_exit();
1218 proc_if6_fail:
1219         ipv6_misc_proc_exit();
1220 proc_misc6_fail:
1221         udplite6_proc_exit();
1222 proc_udplite6_fail:
1223         raw6_proc_exit();
1224 proc_raw6_fail:
1225 #endif
1226         ipv6_netfilter_fini();
1227 netfilter_fail:
1228         igmp6_cleanup();
1229 igmp_fail:
1230         ndisc_cleanup();
1231 ndisc_fail:
1232         ip6_mr_cleanup();
1233 ipmr_fail:
1234         icmpv6_cleanup();
1235 icmp_fail:
1236         unregister_pernet_subsys(&inet6_net_ops);
1237 register_pernet_fail:
1238 #ifdef CONFIG_SYSCTL
1239         ipv6_static_sysctl_unregister();
1240 static_sysctl_fail:
1241 #endif
1242         sock_unregister(PF_INET6);
1243         rtnl_unregister_all(PF_INET6);
1244 out_sock_register_fail:
1245         rawv6_exit();
1246 out_unregister_raw_proto:
1247         proto_unregister(&rawv6_prot);
1248 out_unregister_udplite_proto:
1249         proto_unregister(&udplitev6_prot);
1250 out_unregister_udp_proto:
1251         proto_unregister(&udpv6_prot);
1252 out_unregister_tcp_proto:
1253         proto_unregister(&tcpv6_prot);
1254         goto out;
1255 }
1256 module_init(inet6_init);
1257
1258 static void __exit inet6_exit(void)
1259 {
1260         if (disable_ipv6_mod)
1261                 return;
1262
1263         /* First of all disallow new sockets creation. */
1264         sock_unregister(PF_INET6);
1265         /* Disallow any further netlink messages */
1266         rtnl_unregister_all(PF_INET6);
1267
1268 #ifdef CONFIG_SYSCTL
1269         ipv6_sysctl_unregister();
1270 #endif
1271         udpv6_exit();
1272         udplitev6_exit();
1273         tcpv6_exit();
1274
1275         /* Cleanup code parts. */
1276         ipv6_packet_cleanup();
1277         ipv6_frag_exit();
1278         ipv6_exthdrs_exit();
1279         addrconf_cleanup();
1280         ip6_flowlabel_cleanup();
1281         ip6_route_cleanup();
1282 #ifdef CONFIG_PROC_FS
1283
1284         /* Cleanup code parts. */
1285         if6_proc_exit();
1286         ipv6_misc_proc_exit();
1287         udplite6_proc_exit();
1288         raw6_proc_exit();
1289 #endif
1290         ipv6_netfilter_fini();
1291         igmp6_cleanup();
1292         ndisc_cleanup();
1293         ip6_mr_cleanup();
1294         icmpv6_cleanup();
1295         rawv6_exit();
1296
1297         unregister_pernet_subsys(&inet6_net_ops);
1298 #ifdef CONFIG_SYSCTL
1299         ipv6_static_sysctl_unregister();
1300 #endif
1301         proto_unregister(&rawv6_prot);
1302         proto_unregister(&udplitev6_prot);
1303         proto_unregister(&udpv6_prot);
1304         proto_unregister(&tcpv6_prot);
1305
1306         rcu_barrier(); /* Wait for completion of call_rcu()'s */
1307 }
1308 module_exit(inet6_exit);
1309
1310 MODULE_ALIAS_NETPROTO(PF_INET6);