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         int try_loading_module = 0;
 110         int err;
 111
 112         /* Look for the requested type/protocol pair. */
 113 lookup_protocol:
 114         err = -ESOCKTNOSUPPORT;
 115         rcu_read_lock();
 116         list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
 117
 118                 err = 0;
 119                 /* Check the non-wild match. */
 120                 if (protocol == answer->protocol) {
 121                         if (protocol != IPPROTO_IP)
 122                                 break;
 123                 } else {
 124                         /* Check for the two wild cases. */
 125                         if (IPPROTO_IP == protocol) {
 126                                 protocol = answer->protocol;
 127                                 break;
 128                         }
 129                         if (IPPROTO_IP == answer->protocol)
 130                                 break;
 131                 }
 132                 err = -EPROTONOSUPPORT;
 133         }
 134
 135         if (err) {
 136                 if (try_loading_module < 2) {
 137                         rcu_read_unlock();
 138                         /*
 139                          * Be more specific, e.g. net-pf-10-proto-132-type-1
 140                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
 141                          */
 142                         if (++try_loading_module == 1)
 143                                 request_module("net-pf-%d-proto-%d-type-%d",
 144                                                 PF_INET6, protocol, sock->type);
 145                         /*
 146                          * Fall back to generic, e.g. net-pf-10-proto-132
 147                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
 148                          */
 149                         else
 150                                 request_module("net-pf-%d-proto-%d",
 151                                                 PF_INET6, protocol);
 152                         goto lookup_protocol;
 153                 } else
 154                         goto out_rcu_unlock;
 155         }
 156
 157         err = -EPERM;
 158         if (sock->type == SOCK_RAW && !kern &&
 159             !ns_capable(net->user_ns, CAP_NET_RAW))
 160                 goto out_rcu_unlock;
 161
 162         sock->ops = answer->ops;
 163         answer_prot = answer->prot;
 164         answer_flags = answer->flags;
 165         rcu_read_unlock();
 166
 167         WARN_ON(answer_prot->slab == NULL);
 168
 169         err = -ENOBUFS;
 170         sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot);
 171         if (sk == NULL)
 172                 goto out;
 173
 174         sock_init_data(sock, sk);
 175
 176         err = 0;
 177         if (INET_PROTOSW_REUSE & answer_flags)
 178                 sk->sk_reuse = SK_CAN_REUSE;
 179
 180         inet = inet_sk(sk);
 181         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
 182
 183         if (SOCK_RAW == sock->type) {
 184                 inet->inet_num = protocol;
 185                 if (IPPROTO_RAW == protocol)
 186                         inet->hdrincl = 1;
 187         }
 188
 189         sk->sk_destruct         = inet_sock_destruct;
 190         sk->sk_family           = PF_INET6;
 191         sk->sk_protocol         = protocol;
 192
 193         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
 194
 195         inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
 196         np->hop_limit   = -1;
 197         np->mcast_hops  = IPV6_DEFAULT_MCASTHOPS;
 198         np->mc_loop     = 1;
 199         np->pmtudisc    = IPV6_PMTUDISC_WANT;
 200         sk->sk_ipv6only = net->ipv6.sysctl.bindv6only;
 201
 202         /* Init the ipv4 part of the socket since we can have sockets
 203          * using v6 API for ipv4.
 204          */
 205         inet->uc_ttl    = -1;
 206
 207         inet->mc_loop   = 1;
 208         inet->mc_ttl    = 1;
 209         inet->mc_index  = 0;
 210         inet->mc_list   = NULL;
 211         inet->rcv_tos   = 0;
 212
 213         if (net->ipv4.sysctl_ip_no_pmtu_disc)
 214                 inet->pmtudisc = IP_PMTUDISC_DONT;
 215         else
 216                 inet->pmtudisc = IP_PMTUDISC_WANT;
 217         /*
 218          * Increment only the relevant sk_prot->socks debug field, this changes
 219          * the previous behaviour of incrementing both the equivalent to
 220          * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
 221          *
 222          * This allows better debug granularity as we'll know exactly how many
 223          * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
 224          * transport protocol socks. -acme
 225          */
 226         sk_refcnt_debug_inc(sk);
 227
 228         if (inet->inet_num) {
 229                 /* It assumes that any protocol which allows
 230                  * the user to assign a number at socket
 231                  * creation time automatically shares.
 232                  */
 233                 inet->inet_sport = htons(inet->inet_num);
 234                 sk->sk_prot->hash(sk);
 235         }
 236         if (sk->sk_prot->init) {
 237                 err = sk->sk_prot->init(sk);
 238                 if (err) {
 239                         sk_common_release(sk);
 240                         goto out;
 241                 }
 242         }
 243 out:
 244         return err;
 245 out_rcu_unlock:
 246         rcu_read_unlock();
 247         goto out;
 248 }
 249
 250
 251 /* bind for INET6 API */
 252 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 253 {
 254         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
 255         struct sock *sk = sock->sk;
 256         struct inet_sock *inet = inet_sk(sk);
 257         struct ipv6_pinfo *np = inet6_sk(sk);
 258         struct net *net = sock_net(sk);
 259         __be32 v4addr = 0;
 260         unsigned short snum;
 261         int addr_type = 0;
 262         int err = 0;
 263
 264         /* If the socket has its own bind function then use it. */
 265         if (sk->sk_prot->bind)
 266                 return sk->sk_prot->bind(sk, uaddr, addr_len);
 267
 268         if (addr_len < SIN6_LEN_RFC2133)
 269                 return -EINVAL;
 270
 271         if (addr->sin6_family != AF_INET6)
 272                 return -EAFNOSUPPORT;
 273
 274         addr_type = ipv6_addr_type(&addr->sin6_addr);
 275         if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
 276                 return -EINVAL;
 277
 278         snum = ntohs(addr->sin6_port);
 279         if (snum && snum < PROT_SOCK && !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
 280                 return -EACCES;
 281
 282         lock_sock(sk);
 283
 284         /* Check these errors (active socket, double bind). */
 285         if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
 286                 err = -EINVAL;
 287                 goto out;
 288         }
 289
 290         /* Check if the address belongs to the host. */
 291         if (addr_type == IPV6_ADDR_MAPPED) {
 292                 int chk_addr_ret;
 293
 294                 /* Binding to v4-mapped address on a v6-only socket
 295                  * makes no sense
 296                  */
 297                 if (sk->sk_ipv6only) {
 298                         err = -EINVAL;
 299                         goto out;
 300                 }
 301
 302                 /* Reproduce AF_INET checks to make the bindings consistent */
 303                 v4addr = addr->sin6_addr.s6_addr32[3];
 304                 chk_addr_ret = inet_addr_type(net, v4addr);
 305                 if (!net->ipv4.sysctl_ip_nonlocal_bind &&
 306                     !(inet->freebind || inet->transparent) &&
 307                     v4addr != htonl(INADDR_ANY) &&
 308                     chk_addr_ret != RTN_LOCAL &&
 309                     chk_addr_ret != RTN_MULTICAST &&
 310                     chk_addr_ret != RTN_BROADCAST) {
 311                         err = -EADDRNOTAVAIL;
 312                         goto out;
 313                 }
 314         } else {
 315                 if (addr_type != IPV6_ADDR_ANY) {
 316                         struct net_device *dev = NULL;
 317
 318                         rcu_read_lock();
 319                         if (__ipv6_addr_needs_scope_id(addr_type)) {
 320                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 321                                     addr->sin6_scope_id) {
 322                                         /* Override any existing binding, if another one
 323                                          * is supplied by user.
 324                                          */
 325                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
 326                                 }
 327
 328                                 /* Binding to link-local address requires an interface */
 329                                 if (!sk->sk_bound_dev_if) {
 330                                         err = -EINVAL;
 331                                         goto out_unlock;
 332                                 }
 333                                 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
 334                                 if (!dev) {
 335                                         err = -ENODEV;
 336                                         goto out_unlock;
 337                                 }
 338                         }
 339
 340                         /* ipv4 addr of the socket is invalid.  Only the
 341                          * unspecified and mapped address have a v4 equivalent.
 342                          */
 343                         v4addr = LOOPBACK4_IPV6;
 344                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
 345                                 if (!(inet->freebind || inet->transparent) &&
 346                                     !ipv6_chk_addr(net, &addr->sin6_addr,
 347                                                    dev, 0)) {
 348                                         err = -EADDRNOTAVAIL;
 349                                         goto out_unlock;
 350                                 }
 351                         }
 352                         rcu_read_unlock();
 353                 }
 354         }
 355
 356         inet->inet_rcv_saddr = v4addr;
 357         inet->inet_saddr = v4addr;
 358
 359         sk->sk_v6_rcv_saddr = addr->sin6_addr;
 360
 361         if (!(addr_type & IPV6_ADDR_MULTICAST))
 362                 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                         sk->sk_ipv6only = 1;
 375         }
 376         if (snum)
 377                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
 378         inet->inet_sport = htons(inet->inet_num);
 379         inet->inet_dport = 0;
 380         inet->inet_daddr = 0;
 381 out:
 382         release_sock(sk);
 383         return err;
 384 out_unlock:
 385         rcu_read_unlock();
 386         goto out;
 387 }
 388 EXPORT_SYMBOL(inet6_bind);
 389
 390 int inet6_release(struct socket *sock)
 391 {
 392         struct sock *sk = sock->sk;
 393
 394         if (sk == NULL)
 395                 return -EINVAL;
 396
 397         /* Free mc lists */
 398         ipv6_sock_mc_close(sk);
 399
 400         /* Free ac lists */
 401         ipv6_sock_ac_close(sk);
 402
 403         return inet_release(sock);
 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         skb = xchg(&np->pktoptions, NULL);
 416         if (skb != NULL)
 417                 kfree_skb(skb);
 418
 419         skb = xchg(&np->rxpmtu, NULL);
 420         if (skb != NULL)
 421                 kfree_skb(skb);
 422
 423         /* Free flowlabels */
 424         fl6_free_socklist(sk);
 425
 426         /* Free tx options */
 427
 428         opt = xchg(&np->opt, NULL);
 429         if (opt != NULL)
 430                 sock_kfree_s(sk, opt, opt->tot_len);
 431 }
 432 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
 433
 434 /*
 435  *      This does both peername and sockname.
 436  */
 437
 438 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 439                  int *uaddr_len, int peer)
 440 {
 441         struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
 442         struct sock *sk = sock->sk;
 443         struct inet_sock *inet = inet_sk(sk);
 444         struct ipv6_pinfo *np = inet6_sk(sk);
 445
 446         sin->sin6_family = AF_INET6;
 447         sin->sin6_flowinfo = 0;
 448         sin->sin6_scope_id = 0;
 449         if (peer) {
 450                 if (!inet->inet_dport)
 451                         return -ENOTCONN;
 452                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
 453                     peer == 1)
 454                         return -ENOTCONN;
 455                 sin->sin6_port = inet->inet_dport;
 456                 sin->sin6_addr = sk->sk_v6_daddr;
 457                 if (np->sndflow)
 458                         sin->sin6_flowinfo = np->flow_label;
 459         } else {
 460                 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
 461                         sin->sin6_addr = np->saddr;
 462                 else
 463                         sin->sin6_addr = sk->sk_v6_rcv_saddr;
 464
 465                 sin->sin6_port = inet->inet_sport;
 466         }
 467         sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
 468                                                  sk->sk_bound_dev_if);
 469         *uaddr_len = sizeof(*sin);
 470         return 0;
 471 }
 472 EXPORT_SYMBOL(inet6_getname);
 473
 474 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 475 {
 476         struct sock *sk = sock->sk;
 477         struct net *net = sock_net(sk);
 478
 479         switch (cmd) {
 480         case SIOCGSTAMP:
 481                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
 482
 483         case SIOCGSTAMPNS:
 484                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
 485
 486         case SIOCADDRT:
 487         case SIOCDELRT:
 488
 489                 return ipv6_route_ioctl(net, cmd, (void __user *)arg);
 490
 491         case SIOCSIFADDR:
 492                 return addrconf_add_ifaddr(net, (void __user *) arg);
 493         case SIOCDIFADDR:
 494                 return addrconf_del_ifaddr(net, (void __user *) arg);
 495         case SIOCSIFDSTADDR:
 496                 return addrconf_set_dstaddr(net, (void __user *) arg);
 497         default:
 498                 if (!sk->sk_prot->ioctl)
 499                         return -ENOIOCTLCMD;
 500                 return sk->sk_prot->ioctl(sk, cmd, arg);
 501         }
 502         /*NOTREACHED*/
 503         return 0;
 504 }
 505 EXPORT_SYMBOL(inet6_ioctl);
 506
 507 const struct proto_ops inet6_stream_ops = {
 508         .family            = PF_INET6,
 509         .owner             = THIS_MODULE,
 510         .release           = inet6_release,
 511         .bind              = inet6_bind,
 512         .connect           = inet_stream_connect,       /* ok           */
 513         .socketpair        = sock_no_socketpair,        /* a do nothing */
 514         .accept            = inet_accept,               /* ok           */
 515         .getname           = inet6_getname,
 516         .poll              = tcp_poll,                  /* ok           */
 517         .ioctl             = inet6_ioctl,               /* must change  */
 518         .listen            = inet_listen,               /* ok           */
 519         .shutdown          = inet_shutdown,             /* ok           */
 520         .setsockopt        = sock_common_setsockopt,    /* ok           */
 521         .getsockopt        = sock_common_getsockopt,    /* ok           */
 522         .sendmsg           = inet_sendmsg,              /* ok           */
 523         .recvmsg           = inet_recvmsg,              /* ok           */
 524         .mmap              = sock_no_mmap,
 525         .sendpage          = inet_sendpage,
 526         .splice_read       = tcp_splice_read,
 527 #ifdef CONFIG_COMPAT
 528         .compat_setsockopt = compat_sock_common_setsockopt,
 529         .compat_getsockopt = compat_sock_common_getsockopt,
 530 #endif
 531 };
 532
 533 const struct proto_ops inet6_dgram_ops = {
 534         .family            = PF_INET6,
 535         .owner             = THIS_MODULE,
 536         .release           = inet6_release,
 537         .bind              = inet6_bind,
 538         .connect           = inet_dgram_connect,        /* ok           */
 539         .socketpair        = sock_no_socketpair,        /* a do nothing */
 540         .accept            = sock_no_accept,            /* a do nothing */
 541         .getname           = inet6_getname,
 542         .poll              = udp_poll,                  /* ok           */
 543         .ioctl             = inet6_ioctl,               /* must change  */
 544         .listen            = sock_no_listen,            /* ok           */
 545         .shutdown          = inet_shutdown,             /* ok           */
 546         .setsockopt        = sock_common_setsockopt,    /* ok           */
 547         .getsockopt        = sock_common_getsockopt,    /* ok           */
 548         .sendmsg           = inet_sendmsg,              /* ok           */
 549         .recvmsg           = inet_recvmsg,              /* ok           */
 550         .mmap              = sock_no_mmap,
 551         .sendpage          = sock_no_sendpage,
 552 #ifdef CONFIG_COMPAT
 553         .compat_setsockopt = compat_sock_common_setsockopt,
 554         .compat_getsockopt = compat_sock_common_getsockopt,
 555 #endif
 556 };
 557
 558 static const struct net_proto_family inet6_family_ops = {
 559         .family = PF_INET6,
 560         .create = inet6_create,
 561         .owner  = THIS_MODULE,
 562 };
 563
 564 int inet6_register_protosw(struct inet_protosw *p)
 565 {
 566         struct list_head *lh;
 567         struct inet_protosw *answer;
 568         struct list_head *last_perm;
 569         int protocol = p->protocol;
 570         int ret;
 571
 572         spin_lock_bh(&inetsw6_lock);
 573
 574         ret = -EINVAL;
 575         if (p->type >= SOCK_MAX)
 576                 goto out_illegal;
 577
 578         /* If we are trying to override a permanent protocol, bail. */
 579         answer = NULL;
 580         ret = -EPERM;
 581         last_perm = &inetsw6[p->type];
 582         list_for_each(lh, &inetsw6[p->type]) {
 583                 answer = list_entry(lh, struct inet_protosw, list);
 584
 585                 /* Check only the non-wild match. */
 586                 if (INET_PROTOSW_PERMANENT & answer->flags) {
 587                         if (protocol == answer->protocol)
 588                                 break;
 589                         last_perm = lh;
 590                 }
 591
 592                 answer = NULL;
 593         }
 594         if (answer)
 595                 goto out_permanent;
 596
 597         /* Add the new entry after the last permanent entry if any, so that
 598          * the new entry does not override a permanent entry when matched with
 599          * a wild-card protocol. But it is allowed to override any existing
 600          * non-permanent entry.  This means that when we remove this entry, the
 601          * system automatically returns to the old behavior.
 602          */
 603         list_add_rcu(&p->list, last_perm);
 604         ret = 0;
 605 out:
 606         spin_unlock_bh(&inetsw6_lock);
 607         return ret;
 608
 609 out_permanent:
 610         pr_err("Attempt to override permanent protocol %d\n", protocol);
 611         goto out;
 612
 613 out_illegal:
 614         pr_err("Ignoring attempt to register invalid socket type %d\n",
 615                p->type);
 616         goto out;
 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                 pr_err("Attempt to unregister permanent protocol %d\n",
 625                        p->protocol);
 626         } else {
 627                 spin_lock_bh(&inetsw6_lock);
 628                 list_del_rcu(&p->list);
 629                 spin_unlock_bh(&inetsw6_lock);
 630
 631                 synchronize_net();
 632         }
 633 }
 634 EXPORT_SYMBOL(inet6_unregister_protosw);
 635
 636 int inet6_sk_rebuild_header(struct sock *sk)
 637 {
 638         struct ipv6_pinfo *np = inet6_sk(sk);
 639         struct dst_entry *dst;
 640
 641         dst = __sk_dst_check(sk, np->dst_cookie);
 642
 643         if (dst == NULL) {
 644                 struct inet_sock *inet = inet_sk(sk);
 645                 struct in6_addr *final_p, final;
 646                 struct flowi6 fl6;
 647
 648                 memset(&fl6, 0, sizeof(fl6));
 649                 fl6.flowi6_proto = sk->sk_protocol;
 650                 fl6.daddr = sk->sk_v6_daddr;
 651                 fl6.saddr = np->saddr;
 652                 fl6.flowlabel = np->flow_label;
 653                 fl6.flowi6_oif = sk->sk_bound_dev_if;
 654                 fl6.flowi6_mark = sk->sk_mark;
 655                 fl6.fl6_dport = inet->inet_dport;
 656                 fl6.fl6_sport = inet->inet_sport;
 657                 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
 658
 659                 final_p = fl6_update_dst(&fl6, np->opt, &final);
 660
 661                 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
 662                 if (IS_ERR(dst)) {
 663                         sk->sk_route_caps = 0;
 664                         sk->sk_err_soft = -PTR_ERR(dst);
 665                         return PTR_ERR(dst);
 666                 }
 667
 668                 __ip6_dst_store(sk, dst, NULL, NULL);
 669         }
 670
 671         return 0;
 672 }
 673 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
 674
 675 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
 676                        const struct inet6_skb_parm *opt)
 677 {
 678         const struct ipv6_pinfo *np = inet6_sk(sk);
 679
 680         if (np->rxopt.all) {
 681                 if ((opt->hop && (np->rxopt.bits.hopopts ||
 682                                   np->rxopt.bits.ohopopts)) ||
 683                     (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) &&
 684                      np->rxopt.bits.rxflow) ||
 685                     (opt->srcrt && (np->rxopt.bits.srcrt ||
 686                      np->rxopt.bits.osrcrt)) ||
 687                     ((opt->dst1 || opt->dst0) &&
 688                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
 689                         return true;
 690         }
 691         return false;
 692 }
 693 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
 694
 695 static struct packet_type ipv6_packet_type __read_mostly = {
 696         .type = cpu_to_be16(ETH_P_IPV6),
 697         .func = ipv6_rcv,
 698 };
 699
 700 static int __init ipv6_packet_init(void)
 701 {
 702         dev_add_pack(&ipv6_packet_type);
 703         return 0;
 704 }
 705
 706 static void ipv6_packet_cleanup(void)
 707 {
 708         dev_remove_pack(&ipv6_packet_type);
 709 }
 710
 711 static int __net_init ipv6_init_mibs(struct net *net)
 712 {
 713         int i;
 714
 715         net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib);
 716         if (!net->mib.udp_stats_in6)
 717                 return -ENOMEM;
 718         net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib);
 719         if (!net->mib.udplite_stats_in6)
 720                 goto err_udplite_mib;
 721         net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib);
 722         if (!net->mib.ipv6_statistics)
 723                 goto err_ip_mib;
 724
 725         for_each_possible_cpu(i) {
 726                 struct ipstats_mib *af_inet6_stats;
 727                 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i);
 728                 u64_stats_init(&af_inet6_stats->syncp);
 729         }
 730
 731
 732         net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib);
 733         if (!net->mib.icmpv6_statistics)
 734                 goto err_icmp_mib;
 735         net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
 736                                                 GFP_KERNEL);
 737         if (!net->mib.icmpv6msg_statistics)
 738                 goto err_icmpmsg_mib;
 739         return 0;
 740
 741 err_icmpmsg_mib:
 742         free_percpu(net->mib.icmpv6_statistics);
 743 err_icmp_mib:
 744         free_percpu(net->mib.ipv6_statistics);
 745 err_ip_mib:
 746         free_percpu(net->mib.udplite_stats_in6);
 747 err_udplite_mib:
 748         free_percpu(net->mib.udp_stats_in6);
 749         return -ENOMEM;
 750 }
 751
 752 static void ipv6_cleanup_mibs(struct net *net)
 753 {
 754         free_percpu(net->mib.udp_stats_in6);
 755         free_percpu(net->mib.udplite_stats_in6);
 756         free_percpu(net->mib.ipv6_statistics);
 757         free_percpu(net->mib.icmpv6_statistics);
 758         kfree(net->mib.icmpv6msg_statistics);
 759 }
 760
 761 static int __net_init inet6_net_init(struct net *net)
 762 {
 763         int err = 0;
 764
 765         net->ipv6.sysctl.bindv6only = 0;
 766         net->ipv6.sysctl.icmpv6_time = 1*HZ;
 767         net->ipv6.sysctl.flowlabel_consistency = 1;
 768         net->ipv6.sysctl.auto_flowlabels = 0;
 769         atomic_set(&net->ipv6.fib6_sernum, 1);
 770
 771         err = ipv6_init_mibs(net);
 772         if (err)
 773                 return err;
 774 #ifdef CONFIG_PROC_FS
 775         err = udp6_proc_init(net);
 776         if (err)
 777                 goto out;
 778         err = tcp6_proc_init(net);
 779         if (err)
 780                 goto proc_tcp6_fail;
 781         err = ac6_proc_init(net);
 782         if (err)
 783                 goto proc_ac6_fail;
 784 #endif
 785         return err;
 786
 787 #ifdef CONFIG_PROC_FS
 788 proc_ac6_fail:
 789         tcp6_proc_exit(net);
 790 proc_tcp6_fail:
 791         udp6_proc_exit(net);
 792 out:
 793         ipv6_cleanup_mibs(net);
 794         return err;
 795 #endif
 796 }
 797
 798 static void __net_exit inet6_net_exit(struct net *net)
 799 {
 800 #ifdef CONFIG_PROC_FS
 801         udp6_proc_exit(net);
 802         tcp6_proc_exit(net);
 803         ac6_proc_exit(net);
 804 #endif
 805         ipv6_cleanup_mibs(net);
 806 }
 807
 808 static struct pernet_operations inet6_net_ops = {
 809         .init = inet6_net_init,
 810         .exit = inet6_net_exit,
 811 };
 812
 813 static const struct ipv6_stub ipv6_stub_impl = {
 814         .ipv6_sock_mc_join = ipv6_sock_mc_join,
 815         .ipv6_sock_mc_drop = ipv6_sock_mc_drop,
 816         .ipv6_dst_lookup = ip6_dst_lookup,
 817         .udpv6_encap_enable = udpv6_encap_enable,
 818         .ndisc_send_na = ndisc_send_na,
 819         .nd_tbl = &nd_tbl,
 820 };
 821
 822 static int __init inet6_init(void)
 823 {
 824         struct list_head *r;
 825         int err = 0;
 826
 827         BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > FIELD_SIZEOF(struct sk_buff, cb));
 828
 829         /* Register the socket-side information for inet6_create.  */
 830         for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
 831                 INIT_LIST_HEAD(r);
 832
 833         if (disable_ipv6_mod) {
 834                 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
 835                 goto out;
 836         }
 837
 838         err = proto_register(&tcpv6_prot, 1);
 839         if (err)
 840                 goto out;
 841
 842         err = proto_register(&udpv6_prot, 1);
 843         if (err)
 844                 goto out_unregister_tcp_proto;
 845
 846         err = proto_register(&udplitev6_prot, 1);
 847         if (err)
 848                 goto out_unregister_udp_proto;
 849
 850         err = proto_register(&rawv6_prot, 1);
 851         if (err)
 852                 goto out_unregister_udplite_proto;
 853
 854         err = proto_register(&pingv6_prot, 1);
 855         if (err)
 856                 goto out_unregister_ping_proto;
 857
 858         /* We MUST register RAW sockets before we create the ICMP6,
 859          * IGMP6, or NDISC control sockets.
 860          */
 861         err = rawv6_init();
 862         if (err)
 863                 goto out_unregister_raw_proto;
 864
 865         /* Register the family here so that the init calls below will
 866          * be able to create sockets. (?? is this dangerous ??)
 867          */
 868         err = sock_register(&inet6_family_ops);
 869         if (err)
 870                 goto out_sock_register_fail;
 871
 872         /*
 873          *      ipngwg API draft makes clear that the correct semantics
 874          *      for TCP and UDP is to consider one TCP and UDP instance
 875          *      in a host available by both INET and INET6 APIs and
 876          *      able to communicate via both network protocols.
 877          */
 878
 879         err = register_pernet_subsys(&inet6_net_ops);
 880         if (err)
 881                 goto register_pernet_fail;
 882         err = icmpv6_init();
 883         if (err)
 884                 goto icmp_fail;
 885         err = ip6_mr_init();
 886         if (err)
 887                 goto ipmr_fail;
 888         err = ndisc_init();
 889         if (err)
 890                 goto ndisc_fail;
 891         err = igmp6_init();
 892         if (err)
 893                 goto igmp_fail;
 894
 895         ipv6_stub = &ipv6_stub_impl;
 896
 897         err = ipv6_netfilter_init();
 898         if (err)
 899                 goto netfilter_fail;
 900         /* Create /proc/foo6 entries. */
 901 #ifdef CONFIG_PROC_FS
 902         err = -ENOMEM;
 903         if (raw6_proc_init())
 904                 goto proc_raw6_fail;
 905         if (udplite6_proc_init())
 906                 goto proc_udplite6_fail;
 907         if (ipv6_misc_proc_init())
 908                 goto proc_misc6_fail;
 909         if (if6_proc_init())
 910                 goto proc_if6_fail;
 911 #endif
 912         err = ip6_route_init();
 913         if (err)
 914                 goto ip6_route_fail;
 915         err = ndisc_late_init();
 916         if (err)
 917                 goto ndisc_late_fail;
 918         err = ip6_flowlabel_init();
 919         if (err)
 920                 goto ip6_flowlabel_fail;
 921         err = addrconf_init();
 922         if (err)
 923                 goto addrconf_fail;
 924
 925         /* Init v6 extension headers. */
 926         err = ipv6_exthdrs_init();
 927         if (err)
 928                 goto ipv6_exthdrs_fail;
 929
 930         err = ipv6_frag_init();
 931         if (err)
 932                 goto ipv6_frag_fail;
 933
 934         /* Init v6 transport protocols. */
 935         err = udpv6_init();
 936         if (err)
 937                 goto udpv6_fail;
 938
 939         err = udplitev6_init();
 940         if (err)
 941                 goto udplitev6_fail;
 942
 943         err = tcpv6_init();
 944         if (err)
 945                 goto tcpv6_fail;
 946
 947         err = ipv6_packet_init();
 948         if (err)
 949                 goto ipv6_packet_fail;
 950
 951         err = pingv6_init();
 952         if (err)
 953                 goto pingv6_fail;
 954
 955 #ifdef CONFIG_SYSCTL
 956         err = ipv6_sysctl_register();
 957         if (err)
 958                 goto sysctl_fail;
 959 #endif
 960 out:
 961         return err;
 962
 963 #ifdef CONFIG_SYSCTL
 964 sysctl_fail:
 965         pingv6_exit();
 966 #endif
 967 pingv6_fail:
 968         ipv6_packet_cleanup();
 969 ipv6_packet_fail:
 970         tcpv6_exit();
 971 tcpv6_fail:
 972         udplitev6_exit();
 973 udplitev6_fail:
 974         udpv6_exit();
 975 udpv6_fail:
 976         ipv6_frag_exit();
 977 ipv6_frag_fail:
 978         ipv6_exthdrs_exit();
 979 ipv6_exthdrs_fail:
 980         addrconf_cleanup();
 981 addrconf_fail:
 982         ip6_flowlabel_cleanup();
 983 ip6_flowlabel_fail:
 984         ndisc_late_cleanup();
 985 ndisc_late_fail:
 986         ip6_route_cleanup();
 987 ip6_route_fail:
 988 #ifdef CONFIG_PROC_FS
 989         if6_proc_exit();
 990 proc_if6_fail:
 991         ipv6_misc_proc_exit();
 992 proc_misc6_fail:
 993         udplite6_proc_exit();
 994 proc_udplite6_fail:
 995         raw6_proc_exit();
 996 proc_raw6_fail:
 997 #endif
 998         ipv6_netfilter_fini();
 999 netfilter_fail:
1000         igmp6_cleanup();
1001 igmp_fail:
1002         ndisc_cleanup();
1003 ndisc_fail:
1004         ip6_mr_cleanup();
1005 ipmr_fail:
1006         icmpv6_cleanup();
1007 icmp_fail:
1008         unregister_pernet_subsys(&inet6_net_ops);
1009 register_pernet_fail:
1010         sock_unregister(PF_INET6);
1011         rtnl_unregister_all(PF_INET6);
1012 out_sock_register_fail:
1013         rawv6_exit();
1014 out_unregister_ping_proto:
1015         proto_unregister(&pingv6_prot);
1016 out_unregister_raw_proto:
1017         proto_unregister(&rawv6_prot);
1018 out_unregister_udplite_proto:
1019         proto_unregister(&udplitev6_prot);
1020 out_unregister_udp_proto:
1021         proto_unregister(&udpv6_prot);
1022 out_unregister_tcp_proto:
1023         proto_unregister(&tcpv6_prot);
1024         goto out;
1025 }
1026 module_init(inet6_init);
1027
1028 MODULE_ALIAS_NETPROTO(PF_INET6);