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 (answer->capability > 0 && !capable(answer->capability))
 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->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->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->sport = htons(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->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                         if (addr_type & IPV6_ADDR_LINKLOCAL) {
 318                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 319                                     addr->sin6_scope_id) {
 320                                         /* Override any existing binding, if another one
 321                                          * is supplied by user.
 322                                          */
 323                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
 324                                 }
 325
 326                                 /* Binding to link-local address requires an interface */
 327                                 if (!sk->sk_bound_dev_if) {
 328                                         err = -EINVAL;
 329                                         goto out;
 330                                 }
 331                                 dev = dev_get_by_index(net, sk->sk_bound_dev_if);
 332                                 if (!dev) {
 333                                         err = -ENODEV;
 334                                         goto out;
 335                                 }
 336                         }
 337
 338                         /* ipv4 addr of the socket is invalid.  Only the
 339                          * unspecified and mapped address have a v4 equivalent.
 340                          */
 341                         v4addr = LOOPBACK4_IPV6;
 342                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
 343                                 if (!ipv6_chk_addr(net, &addr->sin6_addr,
 344                                                    dev, 0)) {
 345                                         if (dev)
 346                                                 dev_put(dev);
 347                                         err = -EADDRNOTAVAIL;
 348                                         goto out;
 349                                 }
 350                         }
 351                         if (dev)
 352                                 dev_put(dev);
 353                 }
 354         }
 355
 356         inet->rcv_saddr = v4addr;
 357         inet->saddr = v4addr;
 358
 359         ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
 360
 361         if (!(addr_type & IPV6_ADDR_MULTICAST))
 362                 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
 363
 364         /* Make sure we are allowed to bind here. */
 365         if (sk->sk_prot->get_port(sk, snum)) {
 366                 inet_reset_saddr(sk);
 367                 err = -EADDRINUSE;
 368                 goto out;
 369         }
 370
 371         if (addr_type != IPV6_ADDR_ANY) {
 372                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
 373                 if (addr_type != IPV6_ADDR_MAPPED)
 374                         np->ipv6only = 1;
 375         }
 376         if (snum)
 377                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
 378         inet->sport = htons(inet->num);
 379         inet->dport = 0;
 380         inet->daddr = 0;
 381 out:
 382         release_sock(sk);
 383         return err;
 384 }
 385
 386 EXPORT_SYMBOL(inet6_bind);
 387
 388 int inet6_release(struct socket *sock)
 389 {
 390         struct sock *sk = sock->sk;
 391
 392         if (sk == NULL)
 393                 return -EINVAL;
 394
 395         /* Free mc lists */
 396         ipv6_sock_mc_close(sk);
 397
 398         /* Free ac lists */
 399         ipv6_sock_ac_close(sk);
 400
 401         return inet_release(sock);
 402 }
 403
 404 EXPORT_SYMBOL(inet6_release);
 405
 406 void inet6_destroy_sock(struct sock *sk)
 407 {
 408         struct ipv6_pinfo *np = inet6_sk(sk);
 409         struct sk_buff *skb;
 410         struct ipv6_txoptions *opt;
 411
 412         /* Release rx options */
 413
 414         if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
 415                 kfree_skb(skb);
 416
 417         /* Free flowlabels */
 418         fl6_free_socklist(sk);
 419
 420         /* Free tx options */
 421
 422         if ((opt = xchg(&np->opt, NULL)) != NULL)
 423                 sock_kfree_s(sk, opt, opt->tot_len);
 424 }
 425
 426 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
 427
 428 /*
 429  *      This does both peername and sockname.
 430  */
 431
 432 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 433                  int *uaddr_len, int peer)
 434 {
 435         struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
 436         struct sock *sk = sock->sk;
 437         struct inet_sock *inet = inet_sk(sk);
 438         struct ipv6_pinfo *np = inet6_sk(sk);
 439
 440         sin->sin6_family = AF_INET6;
 441         sin->sin6_flowinfo = 0;
 442         sin->sin6_scope_id = 0;
 443         if (peer) {
 444                 if (!inet->dport)
 445                         return -ENOTCONN;
 446                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
 447                     peer == 1)
 448                         return -ENOTCONN;
 449                 sin->sin6_port = inet->dport;
 450                 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
 451                 if (np->sndflow)
 452                         sin->sin6_flowinfo = np->flow_label;
 453         } else {
 454                 if (ipv6_addr_any(&np->rcv_saddr))
 455                         ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
 456                 else
 457                         ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
 458
 459                 sin->sin6_port = inet->sport;
 460         }
 461         if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
 462                 sin->sin6_scope_id = sk->sk_bound_dev_if;
 463         *uaddr_len = sizeof(*sin);
 464         return(0);
 465 }
 466
 467 EXPORT_SYMBOL(inet6_getname);
 468
 469 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 470 {
 471         struct sock *sk = sock->sk;
 472         struct net *net = sock_net(sk);
 473
 474         switch(cmd)
 475         {
 476         case SIOCGSTAMP:
 477                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
 478
 479         case SIOCGSTAMPNS:
 480                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
 481
 482         case SIOCADDRT:
 483         case SIOCDELRT:
 484
 485                 return(ipv6_route_ioctl(net, cmd, (void __user *)arg));
 486
 487         case SIOCSIFADDR:
 488                 return addrconf_add_ifaddr(net, (void __user *) arg);
 489         case SIOCDIFADDR:
 490                 return addrconf_del_ifaddr(net, (void __user *) arg);
 491         case SIOCSIFDSTADDR:
 492                 return addrconf_set_dstaddr(net, (void __user *) arg);
 493         default:
 494                 if (!sk->sk_prot->ioctl)
 495                         return -ENOIOCTLCMD;
 496                 return sk->sk_prot->ioctl(sk, cmd, arg);
 497         }
 498         /*NOTREACHED*/
 499         return(0);
 500 }
 501
 502 EXPORT_SYMBOL(inet6_ioctl);
 503
 504 const struct proto_ops inet6_stream_ops = {
 505         .family            = PF_INET6,
 506         .owner             = THIS_MODULE,
 507         .release           = inet6_release,
 508         .bind              = inet6_bind,
 509         .connect           = inet_stream_connect,       /* ok           */
 510         .socketpair        = sock_no_socketpair,        /* a do nothing */
 511         .accept            = inet_accept,               /* ok           */
 512         .getname           = inet6_getname,
 513         .poll              = tcp_poll,                  /* ok           */
 514         .ioctl             = inet6_ioctl,               /* must change  */
 515         .listen            = inet_listen,               /* ok           */
 516         .shutdown          = inet_shutdown,             /* ok           */
 517         .setsockopt        = sock_common_setsockopt,    /* ok           */
 518         .getsockopt        = sock_common_getsockopt,    /* ok           */
 519         .sendmsg           = tcp_sendmsg,               /* ok           */
 520         .recvmsg           = sock_common_recvmsg,       /* ok           */
 521         .mmap              = sock_no_mmap,
 522         .sendpage          = tcp_sendpage,
 523         .splice_read       = tcp_splice_read,
 524 #ifdef CONFIG_COMPAT
 525         .compat_setsockopt = compat_sock_common_setsockopt,
 526         .compat_getsockopt = compat_sock_common_getsockopt,
 527 #endif
 528 };
 529
 530 const struct proto_ops inet6_dgram_ops = {
 531         .family            = PF_INET6,
 532         .owner             = THIS_MODULE,
 533         .release           = inet6_release,
 534         .bind              = inet6_bind,
 535         .connect           = inet_dgram_connect,        /* ok           */
 536         .socketpair        = sock_no_socketpair,        /* a do nothing */
 537         .accept            = sock_no_accept,            /* a do nothing */
 538         .getname           = inet6_getname,
 539         .poll              = udp_poll,                  /* ok           */
 540         .ioctl             = inet6_ioctl,               /* must change  */
 541         .listen            = sock_no_listen,            /* ok           */
 542         .shutdown          = inet_shutdown,             /* ok           */
 543         .setsockopt        = sock_common_setsockopt,    /* ok           */
 544         .getsockopt        = sock_common_getsockopt,    /* ok           */
 545         .sendmsg           = inet_sendmsg,              /* ok           */
 546         .recvmsg           = sock_common_recvmsg,       /* ok           */
 547         .mmap              = sock_no_mmap,
 548         .sendpage          = sock_no_sendpage,
 549 #ifdef CONFIG_COMPAT
 550         .compat_setsockopt = compat_sock_common_setsockopt,
 551         .compat_getsockopt = compat_sock_common_getsockopt,
 552 #endif
 553 };
 554
 555 static struct net_proto_family inet6_family_ops = {
 556         .family = PF_INET6,
 557         .create = inet6_create,
 558         .owner  = THIS_MODULE,
 559 };
 560
 561 int inet6_register_protosw(struct inet_protosw *p)
 562 {
 563         struct list_head *lh;
 564         struct inet_protosw *answer;
 565         struct list_head *last_perm;
 566         int protocol = p->protocol;
 567         int ret;
 568
 569         spin_lock_bh(&inetsw6_lock);
 570
 571         ret = -EINVAL;
 572         if (p->type >= SOCK_MAX)
 573                 goto out_illegal;
 574
 575         /* If we are trying to override a permanent protocol, bail. */
 576         answer = NULL;
 577         ret = -EPERM;
 578         last_perm = &inetsw6[p->type];
 579         list_for_each(lh, &inetsw6[p->type]) {
 580                 answer = list_entry(lh, struct inet_protosw, list);
 581
 582                 /* Check only the non-wild match. */
 583                 if (INET_PROTOSW_PERMANENT & answer->flags) {
 584                         if (protocol == answer->protocol)
 585                                 break;
 586                         last_perm = lh;
 587                 }
 588
 589                 answer = NULL;
 590         }
 591         if (answer)
 592                 goto out_permanent;
 593
 594         /* Add the new entry after the last permanent entry if any, so that
 595          * the new entry does not override a permanent entry when matched with
 596          * a wild-card protocol. But it is allowed to override any existing
 597          * non-permanent entry.  This means that when we remove this entry, the
 598          * system automatically returns to the old behavior.
 599          */
 600         list_add_rcu(&p->list, last_perm);
 601         ret = 0;
 602 out:
 603         spin_unlock_bh(&inetsw6_lock);
 604         return ret;
 605
 606 out_permanent:
 607         printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
 608                protocol);
 609         goto out;
 610
 611 out_illegal:
 612         printk(KERN_ERR
 613                "Ignoring attempt to register invalid socket type %d.\n",
 614                p->type);
 615         goto out;
 616 }
 617
 618 EXPORT_SYMBOL(inet6_register_protosw);
 619
 620 void
 621 inet6_unregister_protosw(struct inet_protosw *p)
 622 {
 623         if (INET_PROTOSW_PERMANENT & p->flags) {
 624                 printk(KERN_ERR
 625                        "Attempt to unregister permanent protocol %d.\n",
 626                        p->protocol);
 627         } else {
 628                 spin_lock_bh(&inetsw6_lock);
 629                 list_del_rcu(&p->list);
 630                 spin_unlock_bh(&inetsw6_lock);
 631
 632                 synchronize_net();
 633         }
 634 }
 635
 636 EXPORT_SYMBOL(inet6_unregister_protosw);
 637
 638 int inet6_sk_rebuild_header(struct sock *sk)
 639 {
 640         int err;
 641         struct dst_entry *dst;
 642         struct ipv6_pinfo *np = inet6_sk(sk);
 643
 644         dst = __sk_dst_check(sk, np->dst_cookie);
 645
 646         if (dst == NULL) {
 647                 struct inet_sock *inet = inet_sk(sk);
 648                 struct in6_addr *final_p = NULL, final;
 649                 struct flowi fl;
 650
 651                 memset(&fl, 0, sizeof(fl));
 652                 fl.proto = sk->sk_protocol;
 653                 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 654                 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
 655                 fl.fl6_flowlabel = np->flow_label;
 656                 fl.oif = sk->sk_bound_dev_if;
 657                 fl.fl_ip_dport = inet->dport;
 658                 fl.fl_ip_sport = inet->sport;
 659                 security_sk_classify_flow(sk, &fl);
 660
 661                 if (np->opt && np->opt->srcrt) {
 662                         struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
 663                         ipv6_addr_copy(&final, &fl.fl6_dst);
 664                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 665                         final_p = &final;
 666                 }
 667
 668                 err = ip6_dst_lookup(sk, &dst, &fl);
 669                 if (err) {
 670                         sk->sk_route_caps = 0;
 671                         return err;
 672                 }
 673                 if (final_p)
 674                         ipv6_addr_copy(&fl.fl6_dst, final_p);
 675
 676                 if ((err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0) {
 677                         sk->sk_err_soft = -err;
 678                         return err;
 679                 }
 680
 681                 __ip6_dst_store(sk, dst, NULL, NULL);
 682         }
 683
 684         return 0;
 685 }
 686
 687 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
 688
 689 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
 690 {
 691         struct ipv6_pinfo *np = inet6_sk(sk);
 692         struct inet6_skb_parm *opt = IP6CB(skb);
 693
 694         if (np->rxopt.all) {
 695                 if ((opt->hop && (np->rxopt.bits.hopopts ||
 696                                   np->rxopt.bits.ohopopts)) ||
 697                     ((IPV6_FLOWINFO_MASK &
 698                       *(__be32 *)skb_network_header(skb)) &&
 699                      np->rxopt.bits.rxflow) ||
 700                     (opt->srcrt && (np->rxopt.bits.srcrt ||
 701                      np->rxopt.bits.osrcrt)) ||
 702                     ((opt->dst1 || opt->dst0) &&
 703                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
 704                         return 1;
 705         }
 706         return 0;
 707 }
 708
 709 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
 710
 711 static int ipv6_gso_pull_exthdrs(struct sk_buff *skb, int proto)
 712 {
 713         struct inet6_protocol *ops = NULL;
 714
 715         for (;;) {
 716                 struct ipv6_opt_hdr *opth;
 717                 int len;
 718
 719                 if (proto != NEXTHDR_HOP) {
 720                         ops = rcu_dereference(inet6_protos[proto]);
 721
 722                         if (unlikely(!ops))
 723                                 break;
 724
 725                         if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
 726                                 break;
 727                 }
 728
 729                 if (unlikely(!pskb_may_pull(skb, 8)))
 730                         break;
 731
 732                 opth = (void *)skb->data;
 733                 len = ipv6_optlen(opth);
 734
 735                 if (unlikely(!pskb_may_pull(skb, len)))
 736                         break;
 737
 738                 proto = opth->nexthdr;
 739                 __skb_pull(skb, len);
 740         }
 741
 742         return proto;
 743 }
 744
 745 static int ipv6_gso_send_check(struct sk_buff *skb)
 746 {
 747         struct ipv6hdr *ipv6h;
 748         struct inet6_protocol *ops;
 749         int err = -EINVAL;
 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         err = -EPROTONOSUPPORT;
 757
 758         rcu_read_lock();
 759         ops = rcu_dereference(inet6_protos[
 760                 ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]);
 761
 762         if (likely(ops && ops->gso_send_check)) {
 763                 skb_reset_transport_header(skb);
 764                 err = ops->gso_send_check(skb);
 765         }
 766         rcu_read_unlock();
 767
 768 out:
 769         return err;
 770 }
 771
 772 static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features)
 773 {
 774         struct sk_buff *segs = ERR_PTR(-EINVAL);
 775         struct ipv6hdr *ipv6h;
 776         struct inet6_protocol *ops;
 777
 778         if (!(features & NETIF_F_V6_CSUM))
 779                 features &= ~NETIF_F_SG;
 780
 781         if (unlikely(skb_shinfo(skb)->gso_type &
 782                      ~(SKB_GSO_UDP |
 783                        SKB_GSO_DODGY |
 784                        SKB_GSO_TCP_ECN |
 785                        SKB_GSO_TCPV6 |
 786                        0)))
 787                 goto out;
 788
 789         if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
 790                 goto out;
 791
 792         ipv6h = ipv6_hdr(skb);
 793         __skb_pull(skb, sizeof(*ipv6h));
 794         segs = ERR_PTR(-EPROTONOSUPPORT);
 795
 796         rcu_read_lock();
 797         ops = rcu_dereference(inet6_protos[
 798                 ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]);
 799
 800         if (likely(ops && ops->gso_segment)) {
 801                 skb_reset_transport_header(skb);
 802                 segs = ops->gso_segment(skb, features);
 803         }
 804         rcu_read_unlock();
 805
 806         if (unlikely(IS_ERR(segs)))
 807                 goto out;
 808
 809         for (skb = segs; skb; skb = skb->next) {
 810                 ipv6h = ipv6_hdr(skb);
 811                 ipv6h->payload_len = htons(skb->len - skb->mac_len -
 812                                            sizeof(*ipv6h));
 813         }
 814
 815 out:
 816         return segs;
 817 }
 818
 819 struct ipv6_gro_cb {
 820         struct napi_gro_cb napi;
 821         int proto;
 822 };
 823
 824 #define IPV6_GRO_CB(skb) ((struct ipv6_gro_cb *)(skb)->cb)
 825
 826 static struct sk_buff **ipv6_gro_receive(struct sk_buff **head,
 827                                          struct sk_buff *skb)
 828 {
 829         struct inet6_protocol *ops;
 830         struct sk_buff **pp = NULL;
 831         struct sk_buff *p;
 832         struct ipv6hdr *iph;
 833         unsigned int nlen;
 834         unsigned int hlen;
 835         unsigned int off;
 836         int flush = 1;
 837         int proto;
 838         __wsum csum;
 839
 840         off = skb_gro_offset(skb);
 841         hlen = off + sizeof(*iph);
 842         iph = skb_gro_header_fast(skb, off);
 843         if (skb_gro_header_hard(skb, hlen)) {
 844                 iph = skb_gro_header_slow(skb, hlen, off);
 845                 if (unlikely(!iph))
 846                         goto out;
 847         }
 848
 849         skb_gro_pull(skb, sizeof(*iph));
 850         skb_set_transport_header(skb, skb_gro_offset(skb));
 851
 852         flush += ntohs(iph->payload_len) != skb_gro_len(skb);
 853
 854         rcu_read_lock();
 855         proto = iph->nexthdr;
 856         ops = rcu_dereference(inet6_protos[proto]);
 857         if (!ops || !ops->gro_receive) {
 858                 __pskb_pull(skb, skb_gro_offset(skb));
 859                 proto = ipv6_gso_pull_exthdrs(skb, proto);
 860                 skb_gro_pull(skb, -skb_transport_offset(skb));
 861                 skb_reset_transport_header(skb);
 862                 __skb_push(skb, skb_gro_offset(skb));
 863
 864                 if (!ops || !ops->gro_receive)
 865                         goto out_unlock;
 866
 867                 iph = ipv6_hdr(skb);
 868         }
 869
 870         IPV6_GRO_CB(skb)->proto = proto;
 871
 872         flush--;
 873         nlen = skb_network_header_len(skb);
 874
 875         for (p = *head; p; p = p->next) {
 876                 struct ipv6hdr *iph2;
 877
 878                 if (!NAPI_GRO_CB(p)->same_flow)
 879                         continue;
 880
 881                 iph2 = ipv6_hdr(p);
 882
 883                 /* All fields must match except length. */
 884                 if (nlen != skb_network_header_len(p) ||
 885                     memcmp(iph, iph2, offsetof(struct ipv6hdr, payload_len)) ||
 886                     memcmp(&iph->nexthdr, &iph2->nexthdr,
 887                            nlen - offsetof(struct ipv6hdr, nexthdr))) {
 888                         NAPI_GRO_CB(p)->same_flow = 0;
 889                         continue;
 890                 }
 891
 892                 NAPI_GRO_CB(p)->flush |= flush;
 893         }
 894
 895         NAPI_GRO_CB(skb)->flush |= flush;
 896
 897         csum = skb->csum;
 898         skb_postpull_rcsum(skb, iph, skb_network_header_len(skb));
 899
 900         pp = ops->gro_receive(head, skb);
 901
 902         skb->csum = csum;
 903
 904 out_unlock:
 905         rcu_read_unlock();
 906
 907 out:
 908         NAPI_GRO_CB(skb)->flush |= flush;
 909
 910         return pp;
 911 }
 912
 913 static int ipv6_gro_complete(struct sk_buff *skb)
 914 {
 915         struct inet6_protocol *ops;
 916         struct ipv6hdr *iph = ipv6_hdr(skb);
 917         int err = -ENOSYS;
 918
 919         iph->payload_len = htons(skb->len - skb_network_offset(skb) -
 920                                  sizeof(*iph));
 921
 922         rcu_read_lock();
 923         ops = rcu_dereference(inet6_protos[IPV6_GRO_CB(skb)->proto]);
 924         if (WARN_ON(!ops || !ops->gro_complete))
 925                 goto out_unlock;
 926
 927         err = ops->gro_complete(skb);
 928
 929 out_unlock:
 930         rcu_read_unlock();
 931
 932         return err;
 933 }
 934
 935 static struct packet_type ipv6_packet_type __read_mostly = {
 936         .type = cpu_to_be16(ETH_P_IPV6),
 937         .func = ipv6_rcv,
 938         .gso_send_check = ipv6_gso_send_check,
 939         .gso_segment = ipv6_gso_segment,
 940         .gro_receive = ipv6_gro_receive,
 941         .gro_complete = ipv6_gro_complete,
 942 };
 943
 944 static int __init ipv6_packet_init(void)
 945 {
 946         dev_add_pack(&ipv6_packet_type);
 947         return 0;
 948 }
 949
 950 static void ipv6_packet_cleanup(void)
 951 {
 952         dev_remove_pack(&ipv6_packet_type);
 953 }
 954
 955 static int __net_init ipv6_init_mibs(struct net *net)
 956 {
 957         if (snmp_mib_init((void **)net->mib.udp_stats_in6,
 958                           sizeof (struct udp_mib)) < 0)
 959                 return -ENOMEM;
 960         if (snmp_mib_init((void **)net->mib.udplite_stats_in6,
 961                           sizeof (struct udp_mib)) < 0)
 962                 goto err_udplite_mib;
 963         if (snmp_mib_init((void **)net->mib.ipv6_statistics,
 964                           sizeof(struct ipstats_mib)) < 0)
 965                 goto err_ip_mib;
 966         if (snmp_mib_init((void **)net->mib.icmpv6_statistics,
 967                           sizeof(struct icmpv6_mib)) < 0)
 968                 goto err_icmp_mib;
 969         if (snmp_mib_init((void **)net->mib.icmpv6msg_statistics,
 970                           sizeof(struct icmpv6msg_mib)) < 0)
 971                 goto err_icmpmsg_mib;
 972         return 0;
 973
 974 err_icmpmsg_mib:
 975         snmp_mib_free((void **)net->mib.icmpv6_statistics);
 976 err_icmp_mib:
 977         snmp_mib_free((void **)net->mib.ipv6_statistics);
 978 err_ip_mib:
 979         snmp_mib_free((void **)net->mib.udplite_stats_in6);
 980 err_udplite_mib:
 981         snmp_mib_free((void **)net->mib.udp_stats_in6);
 982         return -ENOMEM;
 983 }
 984
 985 static void __net_exit ipv6_cleanup_mibs(struct net *net)
 986 {
 987         snmp_mib_free((void **)net->mib.udp_stats_in6);
 988         snmp_mib_free((void **)net->mib.udplite_stats_in6);
 989         snmp_mib_free((void **)net->mib.ipv6_statistics);
 990         snmp_mib_free((void **)net->mib.icmpv6_statistics);
 991         snmp_mib_free((void **)net->mib.icmpv6msg_statistics);
 992 }
 993
 994 static int __net_init inet6_net_init(struct net *net)
 995 {
 996         int err = 0;
 997
 998         net->ipv6.sysctl.bindv6only = 0;
 999         net->ipv6.sysctl.icmpv6_time = 1*HZ;
1000
1001         err = ipv6_init_mibs(net);
1002         if (err)
1003                 return err;
1004 #ifdef CONFIG_PROC_FS
1005         err = udp6_proc_init(net);
1006         if (err)
1007                 goto out;
1008         err = tcp6_proc_init(net);
1009         if (err)
1010                 goto proc_tcp6_fail;
1011         err = ac6_proc_init(net);
1012         if (err)
1013                 goto proc_ac6_fail;
1014 #endif
1015         return err;
1016
1017 #ifdef CONFIG_PROC_FS
1018 proc_ac6_fail:
1019         tcp6_proc_exit(net);
1020 proc_tcp6_fail:
1021         udp6_proc_exit(net);
1022 out:
1023         ipv6_cleanup_mibs(net);
1024         return err;
1025 #endif
1026 }
1027
1028 static void inet6_net_exit(struct net *net)
1029 {
1030 #ifdef CONFIG_PROC_FS
1031         udp6_proc_exit(net);
1032         tcp6_proc_exit(net);
1033         ac6_proc_exit(net);
1034 #endif
1035         ipv6_cleanup_mibs(net);
1036 }
1037
1038 static struct pernet_operations inet6_net_ops = {
1039         .init = inet6_net_init,
1040         .exit = inet6_net_exit,
1041 };
1042
1043 static int __init inet6_init(void)
1044 {
1045         struct sk_buff *dummy_skb;
1046         struct list_head *r;
1047         int err = 0;
1048
1049         BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
1050
1051         /* Register the socket-side information for inet6_create.  */
1052         for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
1053                 INIT_LIST_HEAD(r);
1054
1055         if (disable_ipv6_mod) {
1056                 printk(KERN_INFO
1057                        "IPv6: Loaded, but administratively disabled, "
1058                        "reboot required to enable\n");
1059                 goto out;
1060         }
1061
1062         err = proto_register(&tcpv6_prot, 1);
1063         if (err)
1064                 goto out;
1065
1066         err = proto_register(&udpv6_prot, 1);
1067         if (err)
1068                 goto out_unregister_tcp_proto;
1069
1070         err = proto_register(&udplitev6_prot, 1);
1071         if (err)
1072                 goto out_unregister_udp_proto;
1073
1074         err = proto_register(&rawv6_prot, 1);
1075         if (err)
1076                 goto out_unregister_udplite_proto;
1077
1078
1079         /* We MUST register RAW sockets before we create the ICMP6,
1080          * IGMP6, or NDISC control sockets.
1081          */
1082         err = rawv6_init();
1083         if (err)
1084                 goto out_unregister_raw_proto;
1085
1086         /* Register the family here so that the init calls below will
1087          * be able to create sockets. (?? is this dangerous ??)
1088          */
1089         err = sock_register(&inet6_family_ops);
1090         if (err)
1091                 goto out_sock_register_fail;
1092
1093 #ifdef CONFIG_SYSCTL
1094         err = ipv6_static_sysctl_register();
1095         if (err)
1096                 goto static_sysctl_fail;
1097 #endif
1098         /*
1099          *      ipngwg API draft makes clear that the correct semantics
1100          *      for TCP and UDP is to consider one TCP and UDP instance
1101          *      in a host availiable by both INET and INET6 APIs and
1102          *      able to communicate via both network protocols.
1103          */
1104
1105         err = register_pernet_subsys(&inet6_net_ops);
1106         if (err)
1107                 goto register_pernet_fail;
1108         err = icmpv6_init();
1109         if (err)
1110                 goto icmp_fail;
1111         err = ip6_mr_init();
1112         if (err)
1113                 goto ipmr_fail;
1114         err = ndisc_init();
1115         if (err)
1116                 goto ndisc_fail;
1117         err = igmp6_init();
1118         if (err)
1119                 goto igmp_fail;
1120         err = ipv6_netfilter_init();
1121         if (err)
1122                 goto netfilter_fail;
1123         /* Create /proc/foo6 entries. */
1124 #ifdef CONFIG_PROC_FS
1125         err = -ENOMEM;
1126         if (raw6_proc_init())
1127                 goto proc_raw6_fail;
1128         if (udplite6_proc_init())
1129                 goto proc_udplite6_fail;
1130         if (ipv6_misc_proc_init())
1131                 goto proc_misc6_fail;
1132         if (if6_proc_init())
1133                 goto proc_if6_fail;
1134 #endif
1135         err = ip6_route_init();
1136         if (err)
1137                 goto ip6_route_fail;
1138         err = ip6_flowlabel_init();
1139         if (err)
1140                 goto ip6_flowlabel_fail;
1141         err = addrconf_init();
1142         if (err)
1143                 goto addrconf_fail;
1144
1145         /* Init v6 extension headers. */
1146         err = ipv6_exthdrs_init();
1147         if (err)
1148                 goto ipv6_exthdrs_fail;
1149
1150         err = ipv6_frag_init();
1151         if (err)
1152                 goto ipv6_frag_fail;
1153
1154         /* Init v6 transport protocols. */
1155         err = udpv6_init();
1156         if (err)
1157                 goto udpv6_fail;
1158
1159         err = udplitev6_init();
1160         if (err)
1161                 goto udplitev6_fail;
1162
1163         err = tcpv6_init();
1164         if (err)
1165                 goto tcpv6_fail;
1166
1167         err = ipv6_packet_init();
1168         if (err)
1169                 goto ipv6_packet_fail;
1170
1171 #ifdef CONFIG_SYSCTL
1172         err = ipv6_sysctl_register();
1173         if (err)
1174                 goto sysctl_fail;
1175 #endif
1176 out:
1177         return err;
1178
1179 #ifdef CONFIG_SYSCTL
1180 sysctl_fail:
1181         ipv6_packet_cleanup();
1182 #endif
1183 ipv6_packet_fail:
1184         tcpv6_exit();
1185 tcpv6_fail:
1186         udplitev6_exit();
1187 udplitev6_fail:
1188         udpv6_exit();
1189 udpv6_fail:
1190         ipv6_frag_exit();
1191 ipv6_frag_fail:
1192         ipv6_exthdrs_exit();
1193 ipv6_exthdrs_fail:
1194         addrconf_cleanup();
1195 addrconf_fail:
1196         ip6_flowlabel_cleanup();
1197 ip6_flowlabel_fail:
1198         ip6_route_cleanup();
1199 ip6_route_fail:
1200 #ifdef CONFIG_PROC_FS
1201         if6_proc_exit();
1202 proc_if6_fail:
1203         ipv6_misc_proc_exit();
1204 proc_misc6_fail:
1205         udplite6_proc_exit();
1206 proc_udplite6_fail:
1207         raw6_proc_exit();
1208 proc_raw6_fail:
1209 #endif
1210         ipv6_netfilter_fini();
1211 netfilter_fail:
1212         igmp6_cleanup();
1213 igmp_fail:
1214         ndisc_cleanup();
1215 ndisc_fail:
1216         ip6_mr_cleanup();
1217 ipmr_fail:
1218         icmpv6_cleanup();
1219 icmp_fail:
1220         unregister_pernet_subsys(&inet6_net_ops);
1221 register_pernet_fail:
1222 #ifdef CONFIG_SYSCTL
1223         ipv6_static_sysctl_unregister();
1224 static_sysctl_fail:
1225 #endif
1226         sock_unregister(PF_INET6);
1227         rtnl_unregister_all(PF_INET6);
1228 out_sock_register_fail:
1229         rawv6_exit();
1230 out_unregister_raw_proto:
1231         proto_unregister(&rawv6_prot);
1232 out_unregister_udplite_proto:
1233         proto_unregister(&udplitev6_prot);
1234 out_unregister_udp_proto:
1235         proto_unregister(&udpv6_prot);
1236 out_unregister_tcp_proto:
1237         proto_unregister(&tcpv6_prot);
1238         goto out;
1239 }
1240 module_init(inet6_init);
1241
1242 static void __exit inet6_exit(void)
1243 {
1244         if (disable_ipv6_mod)
1245                 return;
1246
1247         /* First of all disallow new sockets creation. */
1248         sock_unregister(PF_INET6);
1249         /* Disallow any further netlink messages */
1250         rtnl_unregister_all(PF_INET6);
1251
1252 #ifdef CONFIG_SYSCTL
1253         ipv6_sysctl_unregister();
1254 #endif
1255         udpv6_exit();
1256         udplitev6_exit();
1257         tcpv6_exit();
1258
1259         /* Cleanup code parts. */
1260         ipv6_packet_cleanup();
1261         ipv6_frag_exit();
1262         ipv6_exthdrs_exit();
1263         addrconf_cleanup();
1264         ip6_flowlabel_cleanup();
1265         ip6_route_cleanup();
1266 #ifdef CONFIG_PROC_FS
1267
1268         /* Cleanup code parts. */
1269         if6_proc_exit();
1270         ipv6_misc_proc_exit();
1271         udplite6_proc_exit();
1272         raw6_proc_exit();
1273 #endif
1274         ipv6_netfilter_fini();
1275         igmp6_cleanup();
1276         ndisc_cleanup();
1277         ip6_mr_cleanup();
1278         icmpv6_cleanup();
1279         rawv6_exit();
1280
1281         unregister_pernet_subsys(&inet6_net_ops);
1282 #ifdef CONFIG_SYSCTL
1283         ipv6_static_sysctl_unregister();
1284 #endif
1285         proto_unregister(&rawv6_prot);
1286         proto_unregister(&udplitev6_prot);
1287         proto_unregister(&udpv6_prot);
1288         proto_unregister(&tcpv6_prot);
1289
1290         rcu_barrier(); /* Wait for completion of call_rcu()'s */
1291 }
1292 module_exit(inet6_exit);
1293
1294 MODULE_ALIAS_NETPROTO(PF_INET6);