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 #define pr_fmt(fmt) "IPv6: " fmt
  22
  23 #include <linux/module.h>
  24 #include <linux/capability.h>
  25 #include <linux/errno.h>
  26 #include <linux/types.h>
  27 #include <linux/socket.h>
  28 #include <linux/in.h>
  29 #include <linux/kernel.h>
  30 #include <linux/timer.h>
  31 #include <linux/string.h>
  32 #include <linux/sockios.h>
  33 #include <linux/net.h>
  34 #include <linux/fcntl.h>
  35 #include <linux/mm.h>
  36 #include <linux/interrupt.h>
  37 #include <linux/proc_fs.h>
  38 #include <linux/stat.h>
  39 #include <linux/init.h>
  40 #include <linux/slab.h>
  41
  42 #include <linux/inet.h>
  43 #include <linux/netdevice.h>
  44 #include <linux/icmpv6.h>
  45 #include <linux/netfilter_ipv6.h>
  46
  47 #include <net/ip.h>
  48 #include <net/ipv6.h>
  49 #include <net/udp.h>
  50 #include <net/udplite.h>
  51 #include <net/tcp.h>
  52 #include <net/ping.h>
  53 #include <net/protocol.h>
  54 #include <net/inet_common.h>
  55 #include <net/route.h>
  56 #include <net/transp_v6.h>
  57 #include <net/ip6_route.h>
  58 #include <net/addrconf.h>
  59 #include <net/ndisc.h>
  60 #ifdef CONFIG_IPV6_TUNNEL
  61 #include <net/ip6_tunnel.h>
  62 #endif
  63
  64 #include <asm/uaccess.h>
  65 #include <linux/mroute6.h>
  66
  67 MODULE_AUTHOR("Cast of dozens");
  68 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
  69 MODULE_LICENSE("GPL");
  70
  71 /* The inetsw6 table contains everything that inet6_create needs to
  72  * build a new socket.
  73  */
  74 static struct list_head inetsw6[SOCK_MAX];
  75 static DEFINE_SPINLOCK(inetsw6_lock);
  76
  77 struct ipv6_params ipv6_defaults = {
  78         .disable_ipv6 = 0,
  79         .autoconf = 1,
  80 };
  81
  82 static int disable_ipv6_mod;
  83
  84 module_param_named(disable, disable_ipv6_mod, int, 0444);
  85 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
  86
  87 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
  88 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
  89
  90 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
  91 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
  92
  93 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
  94 {
  95         const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
  96
  97         return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
  98 }
  99
 100 static int inet6_create(struct net *net, struct socket *sock, int protocol,
 101                         int kern)
 102 {
 103         struct inet_sock *inet;
 104         struct ipv6_pinfo *np;
 105         struct sock *sk;
 106         struct inet_protosw *answer;
 107         struct proto *answer_prot;
 108         unsigned char answer_flags;
 109         char answer_no_check;
 110         int try_loading_module = 0;
 111         int err;
 112
 113         /* Look for the requested type/protocol pair. */
 114 lookup_protocol:
 115         err = -ESOCKTNOSUPPORT;
 116         rcu_read_lock();
 117         list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
 118
 119                 err = 0;
 120                 /* Check the non-wild match. */
 121                 if (protocol == answer->protocol) {
 122                         if (protocol != IPPROTO_IP)
 123                                 break;
 124                 } else {
 125                         /* Check for the two wild cases. */
 126                         if (IPPROTO_IP == protocol) {
 127                                 protocol = answer->protocol;
 128                                 break;
 129                         }
 130                         if (IPPROTO_IP == answer->protocol)
 131                                 break;
 132                 }
 133                 err = -EPROTONOSUPPORT;
 134         }
 135
 136         if (err) {
 137                 if (try_loading_module < 2) {
 138                         rcu_read_unlock();
 139                         /*
 140                          * Be more specific, e.g. net-pf-10-proto-132-type-1
 141                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
 142                          */
 143                         if (++try_loading_module == 1)
 144                                 request_module("net-pf-%d-proto-%d-type-%d",
 145                                                 PF_INET6, protocol, sock->type);
 146                         /*
 147                          * Fall back to generic, e.g. net-pf-10-proto-132
 148                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
 149                          */
 150                         else
 151                                 request_module("net-pf-%d-proto-%d",
 152                                                 PF_INET6, protocol);
 153                         goto lookup_protocol;
 154                 } else
 155                         goto out_rcu_unlock;
 156         }
 157
 158         err = -EPERM;
 159         if (sock->type == SOCK_RAW && !kern &&
 160             !ns_capable(net->user_ns, CAP_NET_RAW))
 161                 goto out_rcu_unlock;
 162
 163         sock->ops = answer->ops;
 164         answer_prot = answer->prot;
 165         answer_no_check = answer->no_check;
 166         answer_flags = answer->flags;
 167         rcu_read_unlock();
 168
 169         WARN_ON(answer_prot->slab == NULL);
 170
 171         err = -ENOBUFS;
 172         sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot);
 173         if (sk == NULL)
 174                 goto out;
 175
 176         sock_init_data(sock, sk);
 177
 178         err = 0;
 179         sk->sk_no_check = answer_no_check;
 180         if (INET_PROTOSW_REUSE & answer_flags)
 181                 sk->sk_reuse = SK_CAN_REUSE;
 182
 183         inet = inet_sk(sk);
 184         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
 185
 186         if (SOCK_RAW == sock->type) {
 187                 inet->inet_num = protocol;
 188                 if (IPPROTO_RAW == protocol)
 189                         inet->hdrincl = 1;
 190         }
 191
 192         sk->sk_destruct         = inet_sock_destruct;
 193         sk->sk_family           = PF_INET6;
 194         sk->sk_protocol         = protocol;
 195
 196         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
 197
 198         inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
 199         np->hop_limit   = -1;
 200         np->mcast_hops  = IPV6_DEFAULT_MCASTHOPS;
 201         np->mc_loop     = 1;
 202         np->pmtudisc    = IPV6_PMTUDISC_WANT;
 203         np->ipv6only    = net->ipv6.sysctl.bindv6only;
 204
 205         /* Init the ipv4 part of the socket since we can have sockets
 206          * using v6 API for ipv4.
 207          */
 208         inet->uc_ttl    = -1;
 209
 210         inet->mc_loop   = 1;
 211         inet->mc_ttl    = 1;
 212         inet->mc_index  = 0;
 213         inet->mc_list   = NULL;
 214         inet->rcv_tos   = 0;
 215
 216         if (net->ipv4.sysctl_ip_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
 274         if (addr->sin6_family != AF_INET6)
 275                 return -EAFNOSUPPORT;
 276
 277         addr_type = ipv6_addr_type(&addr->sin6_addr);
 278         if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
 279                 return -EINVAL;
 280
 281         snum = ntohs(addr->sin6_port);
 282         if (snum && snum < PROT_SOCK && !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
 283                 return -EACCES;
 284
 285         lock_sock(sk);
 286
 287         /* Check these errors (active socket, double bind). */
 288         if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
 289                 err = -EINVAL;
 290                 goto out;
 291         }
 292
 293         /* Check if the address belongs to the host. */
 294         if (addr_type == IPV6_ADDR_MAPPED) {
 295                 int chk_addr_ret;
 296
 297                 /* Binding to v4-mapped address on a v6-only socket
 298                  * makes no sense
 299                  */
 300                 if (np->ipv6only) {
 301                         err = -EINVAL;
 302                         goto out;
 303                 }
 304
 305                 /* Reproduce AF_INET checks to make the bindings consistent */
 306                 v4addr = addr->sin6_addr.s6_addr32[3];
 307                 chk_addr_ret = inet_addr_type(net, v4addr);
 308                 if (!sysctl_ip_nonlocal_bind &&
 309                     !(inet->freebind || inet->transparent) &&
 310                     v4addr != htonl(INADDR_ANY) &&
 311                     chk_addr_ret != RTN_LOCAL &&
 312                     chk_addr_ret != RTN_MULTICAST &&
 313                     chk_addr_ret != RTN_BROADCAST) {
 314                         err = -EADDRNOTAVAIL;
 315                         goto out;
 316                 }
 317         } else {
 318                 if (addr_type != IPV6_ADDR_ANY) {
 319                         struct net_device *dev = NULL;
 320
 321                         rcu_read_lock();
 322                         if (__ipv6_addr_needs_scope_id(addr_type)) {
 323                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 324                                     addr->sin6_scope_id) {
 325                                         /* Override any existing binding, if another one
 326                                          * is supplied by user.
 327                                          */
 328                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
 329                                 }
 330
 331                                 /* Binding to link-local address requires an interface */
 332                                 if (!sk->sk_bound_dev_if) {
 333                                         err = -EINVAL;
 334                                         goto out_unlock;
 335                                 }
 336                                 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
 337                                 if (!dev) {
 338                                         err = -ENODEV;
 339                                         goto out_unlock;
 340                                 }
 341                         }
 342
 343                         /* ipv4 addr of the socket is invalid.  Only the
 344                          * unspecified and mapped address have a v4 equivalent.
 345                          */
 346                         v4addr = LOOPBACK4_IPV6;
 347                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
 348                                 if (!(inet->freebind || inet->transparent) &&
 349                                     !ipv6_chk_addr(net, &addr->sin6_addr,
 350                                                    dev, 0)) {
 351                                         err = -EADDRNOTAVAIL;
 352                                         goto out_unlock;
 353                                 }
 354                         }
 355                         rcu_read_unlock();
 356                 }
 357         }
 358
 359         inet->inet_rcv_saddr = v4addr;
 360         inet->inet_saddr = v4addr;
 361
 362         sk->sk_v6_rcv_saddr = addr->sin6_addr;
 363
 364         if (!(addr_type & IPV6_ADDR_MULTICAST))
 365                 np->saddr = addr->sin6_addr;
 366
 367         /* Make sure we are allowed to bind here. */
 368         if (sk->sk_prot->get_port(sk, snum)) {
 369                 inet_reset_saddr(sk);
 370                 err = -EADDRINUSE;
 371                 goto out;
 372         }
 373
 374         if (addr_type != IPV6_ADDR_ANY) {
 375                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
 376                 if (addr_type != IPV6_ADDR_MAPPED)
 377                         np->ipv6only = 1;
 378         }
 379         if (snum)
 380                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
 381         inet->inet_sport = htons(inet->inet_num);
 382         inet->inet_dport = 0;
 383         inet->inet_daddr = 0;
 384 out:
 385         release_sock(sk);
 386         return err;
 387 out_unlock:
 388         rcu_read_unlock();
 389         goto out;
 390 }
 391 EXPORT_SYMBOL(inet6_bind);
 392
 393 int inet6_release(struct socket *sock)
 394 {
 395         struct sock *sk = sock->sk;
 396
 397         if (sk == NULL)
 398                 return -EINVAL;
 399
 400         /* Free mc lists */
 401         ipv6_sock_mc_close(sk);
 402
 403         /* Free ac lists */
 404         ipv6_sock_ac_close(sk);
 405
 406         return inet_release(sock);
 407 }
 408 EXPORT_SYMBOL(inet6_release);
 409
 410 void inet6_destroy_sock(struct sock *sk)
 411 {
 412         struct ipv6_pinfo *np = inet6_sk(sk);
 413         struct sk_buff *skb;
 414         struct ipv6_txoptions *opt;
 415
 416         /* Release rx options */
 417
 418         skb = xchg(&np->pktoptions, NULL);
 419         if (skb != NULL)
 420                 kfree_skb(skb);
 421
 422         skb = xchg(&np->rxpmtu, NULL);
 423         if (skb != NULL)
 424                 kfree_skb(skb);
 425
 426         /* Free flowlabels */
 427         fl6_free_socklist(sk);
 428
 429         /* Free tx options */
 430
 431         opt = xchg(&np->opt, NULL);
 432         if (opt != NULL)
 433                 sock_kfree_s(sk, opt, opt->tot_len);
 434 }
 435 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
 436
 437 /*
 438  *      This does both peername and sockname.
 439  */
 440
 441 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 442                  int *uaddr_len, int peer)
 443 {
 444         struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
 445         struct sock *sk = sock->sk;
 446         struct inet_sock *inet = inet_sk(sk);
 447         struct ipv6_pinfo *np = inet6_sk(sk);
 448
 449         sin->sin6_family = AF_INET6;
 450         sin->sin6_flowinfo = 0;
 451         sin->sin6_scope_id = 0;
 452         if (peer) {
 453                 if (!inet->inet_dport)
 454                         return -ENOTCONN;
 455                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
 456                     peer == 1)
 457                         return -ENOTCONN;
 458                 sin->sin6_port = inet->inet_dport;
 459                 sin->sin6_addr = sk->sk_v6_daddr;
 460                 if (np->sndflow)
 461                         sin->sin6_flowinfo = np->flow_label;
 462         } else {
 463                 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
 464                         sin->sin6_addr = np->saddr;
 465                 else
 466                         sin->sin6_addr = sk->sk_v6_rcv_saddr;
 467
 468                 sin->sin6_port = inet->inet_sport;
 469         }
 470         sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
 471                                                  sk->sk_bound_dev_if);
 472         *uaddr_len = sizeof(*sin);
 473         return 0;
 474 }
 475 EXPORT_SYMBOL(inet6_getname);
 476
 477 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 478 {
 479         struct sock *sk = sock->sk;
 480         struct net *net = sock_net(sk);
 481
 482         switch (cmd) {
 483         case SIOCGSTAMP:
 484                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
 485
 486         case SIOCGSTAMPNS:
 487                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
 488
 489         case SIOCADDRT:
 490         case SIOCDELRT:
 491
 492                 return ipv6_route_ioctl(net, cmd, (void __user *)arg);
 493
 494         case SIOCSIFADDR:
 495                 return addrconf_add_ifaddr(net, (void __user *) arg);
 496         case SIOCDIFADDR:
 497                 return addrconf_del_ifaddr(net, (void __user *) arg);
 498         case SIOCSIFDSTADDR:
 499                 return addrconf_set_dstaddr(net, (void __user *) arg);
 500         default:
 501                 if (!sk->sk_prot->ioctl)
 502                         return -ENOIOCTLCMD;
 503                 return sk->sk_prot->ioctl(sk, cmd, arg);
 504         }
 505         /*NOTREACHED*/
 506         return 0;
 507 }
 508 EXPORT_SYMBOL(inet6_ioctl);
 509
 510 const struct proto_ops inet6_stream_ops = {
 511         .family            = PF_INET6,
 512         .owner             = THIS_MODULE,
 513         .release           = inet6_release,
 514         .bind              = inet6_bind,
 515         .connect           = inet_stream_connect,       /* ok           */
 516         .socketpair        = sock_no_socketpair,        /* a do nothing */
 517         .accept            = inet_accept,               /* ok           */
 518         .getname           = inet6_getname,
 519         .poll              = tcp_poll,                  /* ok           */
 520         .ioctl             = inet6_ioctl,               /* must change  */
 521         .listen            = inet_listen,               /* ok           */
 522         .shutdown          = inet_shutdown,             /* ok           */
 523         .setsockopt        = sock_common_setsockopt,    /* ok           */
 524         .getsockopt        = sock_common_getsockopt,    /* ok           */
 525         .sendmsg           = inet_sendmsg,              /* ok           */
 526         .recvmsg           = inet_recvmsg,              /* ok           */
 527         .mmap              = sock_no_mmap,
 528         .sendpage          = inet_sendpage,
 529         .splice_read       = tcp_splice_read,
 530 #ifdef CONFIG_COMPAT
 531         .compat_setsockopt = compat_sock_common_setsockopt,
 532         .compat_getsockopt = compat_sock_common_getsockopt,
 533 #endif
 534 };
 535
 536 const struct proto_ops inet6_dgram_ops = {
 537         .family            = PF_INET6,
 538         .owner             = THIS_MODULE,
 539         .release           = inet6_release,
 540         .bind              = inet6_bind,
 541         .connect           = inet_dgram_connect,        /* ok           */
 542         .socketpair        = sock_no_socketpair,        /* a do nothing */
 543         .accept            = sock_no_accept,            /* a do nothing */
 544         .getname           = inet6_getname,
 545         .poll              = udp_poll,                  /* ok           */
 546         .ioctl             = inet6_ioctl,               /* must change  */
 547         .listen            = sock_no_listen,            /* ok           */
 548         .shutdown          = inet_shutdown,             /* ok           */
 549         .setsockopt        = sock_common_setsockopt,    /* ok           */
 550         .getsockopt        = sock_common_getsockopt,    /* ok           */
 551         .sendmsg           = inet_sendmsg,              /* ok           */
 552         .recvmsg           = inet_recvmsg,              /* ok           */
 553         .mmap              = sock_no_mmap,
 554         .sendpage          = sock_no_sendpage,
 555 #ifdef CONFIG_COMPAT
 556         .compat_setsockopt = compat_sock_common_setsockopt,
 557         .compat_getsockopt = compat_sock_common_getsockopt,
 558 #endif
 559 };
 560
 561 static const struct net_proto_family inet6_family_ops = {
 562         .family = PF_INET6,
 563         .create = inet6_create,
 564         .owner  = THIS_MODULE,
 565 };
 566
 567 int inet6_register_protosw(struct inet_protosw *p)
 568 {
 569         struct list_head *lh;
 570         struct inet_protosw *answer;
 571         struct list_head *last_perm;
 572         int protocol = p->protocol;
 573         int ret;
 574
 575         spin_lock_bh(&inetsw6_lock);
 576
 577         ret = -EINVAL;
 578         if (p->type >= SOCK_MAX)
 579                 goto out_illegal;
 580
 581         /* If we are trying to override a permanent protocol, bail. */
 582         answer = NULL;
 583         ret = -EPERM;
 584         last_perm = &inetsw6[p->type];
 585         list_for_each(lh, &inetsw6[p->type]) {
 586                 answer = list_entry(lh, struct inet_protosw, list);
 587
 588                 /* Check only the non-wild match. */
 589                 if (INET_PROTOSW_PERMANENT & answer->flags) {
 590                         if (protocol == answer->protocol)
 591                                 break;
 592                         last_perm = lh;
 593                 }
 594
 595                 answer = NULL;
 596         }
 597         if (answer)
 598                 goto out_permanent;
 599
 600         /* Add the new entry after the last permanent entry if any, so that
 601          * the new entry does not override a permanent entry when matched with
 602          * a wild-card protocol. But it is allowed to override any existing
 603          * non-permanent entry.  This means that when we remove this entry, the
 604          * system automatically returns to the old behavior.
 605          */
 606         list_add_rcu(&p->list, last_perm);
 607         ret = 0;
 608 out:
 609         spin_unlock_bh(&inetsw6_lock);
 610         return ret;
 611
 612 out_permanent:
 613         pr_err("Attempt to override permanent protocol %d\n", protocol);
 614         goto out;
 615
 616 out_illegal:
 617         pr_err("Ignoring attempt to register invalid socket type %d\n",
 618                p->type);
 619         goto out;
 620 }
 621 EXPORT_SYMBOL(inet6_register_protosw);
 622
 623 void
 624 inet6_unregister_protosw(struct inet_protosw *p)
 625 {
 626         if (INET_PROTOSW_PERMANENT & p->flags) {
 627                 pr_err("Attempt to unregister permanent protocol %d\n",
 628                        p->protocol);
 629         } else {
 630                 spin_lock_bh(&inetsw6_lock);
 631                 list_del_rcu(&p->list);
 632                 spin_unlock_bh(&inetsw6_lock);
 633
 634                 synchronize_net();
 635         }
 636 }
 637 EXPORT_SYMBOL(inet6_unregister_protosw);
 638
 639 int inet6_sk_rebuild_header(struct sock *sk)
 640 {
 641         struct ipv6_pinfo *np = inet6_sk(sk);
 642         struct dst_entry *dst;
 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, final;
 649                 struct flowi6 fl6;
 650
 651                 memset(&fl6, 0, sizeof(fl6));
 652                 fl6.flowi6_proto = sk->sk_protocol;
 653                 fl6.daddr = sk->sk_v6_daddr;
 654                 fl6.saddr = np->saddr;
 655                 fl6.flowlabel = np->flow_label;
 656                 fl6.flowi6_oif = sk->sk_bound_dev_if;
 657                 fl6.flowi6_mark = sk->sk_mark;
 658                 fl6.fl6_dport = inet->inet_dport;
 659                 fl6.fl6_sport = inet->inet_sport;
 660                 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
 661
 662                 final_p = fl6_update_dst(&fl6, np->opt, &final);
 663
 664                 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
 665                 if (IS_ERR(dst)) {
 666                         sk->sk_route_caps = 0;
 667                         sk->sk_err_soft = -PTR_ERR(dst);
 668                         return PTR_ERR(dst);
 669                 }
 670
 671                 __ip6_dst_store(sk, dst, NULL, NULL);
 672         }
 673
 674         return 0;
 675 }
 676 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
 677
 678 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb)
 679 {
 680         const struct ipv6_pinfo *np = inet6_sk(sk);
 681         const struct inet6_skb_parm *opt = IP6CB(skb);
 682
 683         if (np->rxopt.all) {
 684                 if ((opt->hop && (np->rxopt.bits.hopopts ||
 685                                   np->rxopt.bits.ohopopts)) ||
 686                     (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) &&
 687                      np->rxopt.bits.rxflow) ||
 688                     (opt->srcrt && (np->rxopt.bits.srcrt ||
 689                      np->rxopt.bits.osrcrt)) ||
 690                     ((opt->dst1 || opt->dst0) &&
 691                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
 692                         return true;
 693         }
 694         return false;
 695 }
 696 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
 697
 698 static struct packet_type ipv6_packet_type __read_mostly = {
 699         .type = cpu_to_be16(ETH_P_IPV6),
 700         .func = ipv6_rcv,
 701 };
 702
 703 static int __init ipv6_packet_init(void)
 704 {
 705         dev_add_pack(&ipv6_packet_type);
 706         return 0;
 707 }
 708
 709 static void ipv6_packet_cleanup(void)
 710 {
 711         dev_remove_pack(&ipv6_packet_type);
 712 }
 713
 714 static int __net_init ipv6_init_mibs(struct net *net)
 715 {
 716         int i;
 717
 718         if (snmp_mib_init((void __percpu **)net->mib.udp_stats_in6,
 719                           sizeof(struct udp_mib),
 720                           __alignof__(struct udp_mib)) < 0)
 721                 return -ENOMEM;
 722         if (snmp_mib_init((void __percpu **)net->mib.udplite_stats_in6,
 723                           sizeof(struct udp_mib),
 724                           __alignof__(struct udp_mib)) < 0)
 725                 goto err_udplite_mib;
 726         if (snmp_mib_init((void __percpu **)net->mib.ipv6_statistics,
 727                           sizeof(struct ipstats_mib),
 728                           __alignof__(struct ipstats_mib)) < 0)
 729                 goto err_ip_mib;
 730
 731         for_each_possible_cpu(i) {
 732                 struct ipstats_mib *af_inet6_stats;
 733                 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics[0], i);
 734                 u64_stats_init(&af_inet6_stats->syncp);
 735 #if SNMP_ARRAY_SZ == 2
 736                 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics[1], i);
 737                 u64_stats_init(&af_inet6_stats->syncp);
 738 #endif
 739         }
 740
 741
 742         if (snmp_mib_init((void __percpu **)net->mib.icmpv6_statistics,
 743                           sizeof(struct icmpv6_mib),
 744                           __alignof__(struct icmpv6_mib)) < 0)
 745                 goto err_icmp_mib;
 746         net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
 747                                                 GFP_KERNEL);
 748         if (!net->mib.icmpv6msg_statistics)
 749                 goto err_icmpmsg_mib;
 750         return 0;
 751
 752 err_icmpmsg_mib:
 753         snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics);
 754 err_icmp_mib:
 755         snmp_mib_free((void __percpu **)net->mib.ipv6_statistics);
 756 err_ip_mib:
 757         snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6);
 758 err_udplite_mib:
 759         snmp_mib_free((void __percpu **)net->mib.udp_stats_in6);
 760         return -ENOMEM;
 761 }
 762
 763 static void ipv6_cleanup_mibs(struct net *net)
 764 {
 765         snmp_mib_free((void __percpu **)net->mib.udp_stats_in6);
 766         snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6);
 767         snmp_mib_free((void __percpu **)net->mib.ipv6_statistics);
 768         snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics);
 769         kfree(net->mib.icmpv6msg_statistics);
 770 }
 771
 772 static int __net_init inet6_net_init(struct net *net)
 773 {
 774         int err = 0;
 775
 776         net->ipv6.sysctl.bindv6only = 0;
 777         net->ipv6.sysctl.icmpv6_time = 1*HZ;
 778         net->ipv6.sysctl.flowlabel_consistency = 1;
 779         atomic_set(&net->ipv6.rt_genid, 0);
 780
 781         err = ipv6_init_mibs(net);
 782         if (err)
 783                 return err;
 784 #ifdef CONFIG_PROC_FS
 785         err = udp6_proc_init(net);
 786         if (err)
 787                 goto out;
 788         err = tcp6_proc_init(net);
 789         if (err)
 790                 goto proc_tcp6_fail;
 791         err = ac6_proc_init(net);
 792         if (err)
 793                 goto proc_ac6_fail;
 794 #endif
 795         return err;
 796
 797 #ifdef CONFIG_PROC_FS
 798 proc_ac6_fail:
 799         tcp6_proc_exit(net);
 800 proc_tcp6_fail:
 801         udp6_proc_exit(net);
 802 out:
 803         ipv6_cleanup_mibs(net);
 804         return err;
 805 #endif
 806 }
 807
 808 static void __net_exit inet6_net_exit(struct net *net)
 809 {
 810 #ifdef CONFIG_PROC_FS
 811         udp6_proc_exit(net);
 812         tcp6_proc_exit(net);
 813         ac6_proc_exit(net);
 814 #endif
 815         ipv6_cleanup_mibs(net);
 816 }
 817
 818 static struct pernet_operations inet6_net_ops = {
 819         .init = inet6_net_init,
 820         .exit = inet6_net_exit,
 821 };
 822
 823 static const struct ipv6_stub ipv6_stub_impl = {
 824         .ipv6_sock_mc_join = ipv6_sock_mc_join,
 825         .ipv6_sock_mc_drop = ipv6_sock_mc_drop,
 826         .ipv6_dst_lookup = ip6_dst_lookup,
 827         .udpv6_encap_enable = udpv6_encap_enable,
 828         .ndisc_send_na = ndisc_send_na,
 829         .nd_tbl = &nd_tbl,
 830 };
 831
 832 static int __init inet6_init(void)
 833 {
 834         struct list_head *r;
 835         int err = 0;
 836
 837         BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > FIELD_SIZEOF(struct sk_buff, cb));
 838
 839         /* Register the socket-side information for inet6_create.  */
 840         for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
 841                 INIT_LIST_HEAD(r);
 842
 843         if (disable_ipv6_mod) {
 844                 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
 845                 goto out;
 846         }
 847
 848         err = proto_register(&tcpv6_prot, 1);
 849         if (err)
 850                 goto out;
 851
 852         err = proto_register(&udpv6_prot, 1);
 853         if (err)
 854                 goto out_unregister_tcp_proto;
 855
 856         err = proto_register(&udplitev6_prot, 1);
 857         if (err)
 858                 goto out_unregister_udp_proto;
 859
 860         err = proto_register(&rawv6_prot, 1);
 861         if (err)
 862                 goto out_unregister_udplite_proto;
 863
 864         err = proto_register(&pingv6_prot, 1);
 865         if (err)
 866                 goto out_unregister_ping_proto;
 867
 868         /* We MUST register RAW sockets before we create the ICMP6,
 869          * IGMP6, or NDISC control sockets.
 870          */
 871         err = rawv6_init();
 872         if (err)
 873                 goto out_unregister_raw_proto;
 874
 875         /* Register the family here so that the init calls below will
 876          * be able to create sockets. (?? is this dangerous ??)
 877          */
 878         err = sock_register(&inet6_family_ops);
 879         if (err)
 880                 goto out_sock_register_fail;
 881
 882         /*
 883          *      ipngwg API draft makes clear that the correct semantics
 884          *      for TCP and UDP is to consider one TCP and UDP instance
 885          *      in a host available by both INET and INET6 APIs and
 886          *      able to communicate via both network protocols.
 887          */
 888
 889         err = register_pernet_subsys(&inet6_net_ops);
 890         if (err)
 891                 goto register_pernet_fail;
 892         err = icmpv6_init();
 893         if (err)
 894                 goto icmp_fail;
 895         err = ip6_mr_init();
 896         if (err)
 897                 goto ipmr_fail;
 898         err = ndisc_init();
 899         if (err)
 900                 goto ndisc_fail;
 901         err = igmp6_init();
 902         if (err)
 903                 goto igmp_fail;
 904
 905         ipv6_stub = &ipv6_stub_impl;
 906
 907         err = ipv6_netfilter_init();
 908         if (err)
 909                 goto netfilter_fail;
 910         /* Create /proc/foo6 entries. */
 911 #ifdef CONFIG_PROC_FS
 912         err = -ENOMEM;
 913         if (raw6_proc_init())
 914                 goto proc_raw6_fail;
 915         if (udplite6_proc_init())
 916                 goto proc_udplite6_fail;
 917         if (ipv6_misc_proc_init())
 918                 goto proc_misc6_fail;
 919         if (if6_proc_init())
 920                 goto proc_if6_fail;
 921 #endif
 922         err = ip6_route_init();
 923         if (err)
 924                 goto ip6_route_fail;
 925         err = ndisc_late_init();
 926         if (err)
 927                 goto ndisc_late_fail;
 928         err = ip6_flowlabel_init();
 929         if (err)
 930                 goto ip6_flowlabel_fail;
 931         err = addrconf_init();
 932         if (err)
 933                 goto addrconf_fail;
 934
 935         /* Init v6 extension headers. */
 936         err = ipv6_exthdrs_init();
 937         if (err)
 938                 goto ipv6_exthdrs_fail;
 939
 940         err = ipv6_frag_init();
 941         if (err)
 942                 goto ipv6_frag_fail;
 943
 944         /* Init v6 transport protocols. */
 945         err = udpv6_init();
 946         if (err)
 947                 goto udpv6_fail;
 948
 949         err = udplitev6_init();
 950         if (err)
 951                 goto udplitev6_fail;
 952
 953         err = tcpv6_init();
 954         if (err)
 955                 goto tcpv6_fail;
 956
 957         err = ipv6_packet_init();
 958         if (err)
 959                 goto ipv6_packet_fail;
 960
 961         err = pingv6_init();
 962         if (err)
 963                 goto pingv6_fail;
 964
 965 #ifdef CONFIG_SYSCTL
 966         err = ipv6_sysctl_register();
 967         if (err)
 968                 goto sysctl_fail;
 969 #endif
 970 out:
 971         return err;
 972
 973 #ifdef CONFIG_SYSCTL
 974 sysctl_fail:
 975         pingv6_exit();
 976 #endif
 977 pingv6_fail:
 978         ipv6_packet_cleanup();
 979 ipv6_packet_fail:
 980         tcpv6_exit();
 981 tcpv6_fail:
 982         udplitev6_exit();
 983 udplitev6_fail:
 984         udpv6_exit();
 985 udpv6_fail:
 986         ipv6_frag_exit();
 987 ipv6_frag_fail:
 988         ipv6_exthdrs_exit();
 989 ipv6_exthdrs_fail:
 990         addrconf_cleanup();
 991 addrconf_fail:
 992         ip6_flowlabel_cleanup();
 993 ip6_flowlabel_fail:
 994         ndisc_late_cleanup();
 995 ndisc_late_fail:
 996         ip6_route_cleanup();
 997 ip6_route_fail:
 998 #ifdef CONFIG_PROC_FS
 999         if6_proc_exit();
1000 proc_if6_fail:
1001         ipv6_misc_proc_exit();
1002 proc_misc6_fail:
1003         udplite6_proc_exit();
1004 proc_udplite6_fail:
1005         raw6_proc_exit();
1006 proc_raw6_fail:
1007 #endif
1008         ipv6_netfilter_fini();
1009 netfilter_fail:
1010         igmp6_cleanup();
1011 igmp_fail:
1012         ndisc_cleanup();
1013 ndisc_fail:
1014         ip6_mr_cleanup();
1015 ipmr_fail:
1016         icmpv6_cleanup();
1017 icmp_fail:
1018         unregister_pernet_subsys(&inet6_net_ops);
1019 register_pernet_fail:
1020         sock_unregister(PF_INET6);
1021         rtnl_unregister_all(PF_INET6);
1022 out_sock_register_fail:
1023         rawv6_exit();
1024 out_unregister_ping_proto:
1025         proto_unregister(&pingv6_prot);
1026 out_unregister_raw_proto:
1027         proto_unregister(&rawv6_prot);
1028 out_unregister_udplite_proto:
1029         proto_unregister(&udplitev6_prot);
1030 out_unregister_udp_proto:
1031         proto_unregister(&udpv6_prot);
1032 out_unregister_tcp_proto:
1033         proto_unregister(&tcpv6_prot);
1034         goto out;
1035 }
1036 module_init(inet6_init);
1037
1038 MODULE_ALIAS_NETPROTO(PF_INET6);