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 #include <net/calipso.h>
  64
  65 #include <asm/uaccess.h>
  66 #include <linux/mroute6.h>
  67
  68 #include "ip6_offload.h"
  69
  70 MODULE_AUTHOR("Cast of dozens");
  71 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
  72 MODULE_LICENSE("GPL");
  73
  74 /* The inetsw6 table contains everything that inet6_create needs to
  75  * build a new socket.
  76  */
  77 static struct list_head inetsw6[SOCK_MAX];
  78 static DEFINE_SPINLOCK(inetsw6_lock);
  79
  80 struct ipv6_params ipv6_defaults = {
  81         .disable_ipv6 = 0,
  82         .autoconf = 1,
  83 };
  84
  85 static int disable_ipv6_mod;
  86
  87 module_param_named(disable, disable_ipv6_mod, int, 0444);
  88 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
  89
  90 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
  91 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
  92
  93 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
  94 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
  95
  96 bool ipv6_mod_enabled(void)
  97 {
  98         return disable_ipv6_mod == 0;
  99 }
 100 EXPORT_SYMBOL_GPL(ipv6_mod_enabled);
 101
 102 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
 103 {
 104         const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
 105
 106         return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
 107 }
 108
 109 static int inet6_create(struct net *net, struct socket *sock, int protocol,
 110                         int kern)
 111 {
 112         struct inet_sock *inet;
 113         struct ipv6_pinfo *np;
 114         struct sock *sk;
 115         struct inet_protosw *answer;
 116         struct proto *answer_prot;
 117         unsigned char answer_flags;
 118         int try_loading_module = 0;
 119         int err;
 120
 121         if (protocol < 0 || protocol >= IPPROTO_MAX)
 122                 return -EINVAL;
 123
 124         /* Look for the requested type/protocol pair. */
 125 lookup_protocol:
 126         err = -ESOCKTNOSUPPORT;
 127         rcu_read_lock();
 128         list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
 129
 130                 err = 0;
 131                 /* Check the non-wild match. */
 132                 if (protocol == answer->protocol) {
 133                         if (protocol != IPPROTO_IP)
 134                                 break;
 135                 } else {
 136                         /* Check for the two wild cases. */
 137                         if (IPPROTO_IP == protocol) {
 138                                 protocol = answer->protocol;
 139                                 break;
 140                         }
 141                         if (IPPROTO_IP == answer->protocol)
 142                                 break;
 143                 }
 144                 err = -EPROTONOSUPPORT;
 145         }
 146
 147         if (err) {
 148                 if (try_loading_module < 2) {
 149                         rcu_read_unlock();
 150                         /*
 151                          * Be more specific, e.g. net-pf-10-proto-132-type-1
 152                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
 153                          */
 154                         if (++try_loading_module == 1)
 155                                 request_module("net-pf-%d-proto-%d-type-%d",
 156                                                 PF_INET6, protocol, sock->type);
 157                         /*
 158                          * Fall back to generic, e.g. net-pf-10-proto-132
 159                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
 160                          */
 161                         else
 162                                 request_module("net-pf-%d-proto-%d",
 163                                                 PF_INET6, protocol);
 164                         goto lookup_protocol;
 165                 } else
 166                         goto out_rcu_unlock;
 167         }
 168
 169         err = -EPERM;
 170         if (sock->type == SOCK_RAW && !kern &&
 171             !ns_capable(net->user_ns, CAP_NET_RAW))
 172                 goto out_rcu_unlock;
 173
 174         sock->ops = answer->ops;
 175         answer_prot = answer->prot;
 176         answer_flags = answer->flags;
 177         rcu_read_unlock();
 178
 179         WARN_ON(!answer_prot->slab);
 180
 181         err = -ENOBUFS;
 182         sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern);
 183         if (!sk)
 184                 goto out;
 185
 186         sock_init_data(sock, sk);
 187
 188         err = 0;
 189         if (INET_PROTOSW_REUSE & answer_flags)
 190                 sk->sk_reuse = SK_CAN_REUSE;
 191
 192         inet = inet_sk(sk);
 193         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
 194
 195         if (SOCK_RAW == sock->type) {
 196                 inet->inet_num = protocol;
 197                 if (IPPROTO_RAW == protocol)
 198                         inet->hdrincl = 1;
 199         }
 200
 201         sk->sk_destruct         = inet_sock_destruct;
 202         sk->sk_family           = PF_INET6;
 203         sk->sk_protocol         = protocol;
 204
 205         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
 206
 207         inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
 208         np->hop_limit   = -1;
 209         np->mcast_hops  = IPV6_DEFAULT_MCASTHOPS;
 210         np->mc_loop     = 1;
 211         np->pmtudisc    = IPV6_PMTUDISC_WANT;
 212         np->autoflowlabel = ip6_default_np_autolabel(sock_net(sk));
 213         sk->sk_ipv6only = net->ipv6.sysctl.bindv6only;
 214
 215         /* Init the ipv4 part of the socket since we can have sockets
 216          * using v6 API for ipv4.
 217          */
 218         inet->uc_ttl    = -1;
 219
 220         inet->mc_loop   = 1;
 221         inet->mc_ttl    = 1;
 222         inet->mc_index  = 0;
 223         inet->mc_list   = NULL;
 224         inet->rcv_tos   = 0;
 225
 226         if (net->ipv4.sysctl_ip_no_pmtu_disc)
 227                 inet->pmtudisc = IP_PMTUDISC_DONT;
 228         else
 229                 inet->pmtudisc = IP_PMTUDISC_WANT;
 230         /*
 231          * Increment only the relevant sk_prot->socks debug field, this changes
 232          * the previous behaviour of incrementing both the equivalent to
 233          * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
 234          *
 235          * This allows better debug granularity as we'll know exactly how many
 236          * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
 237          * transport protocol socks. -acme
 238          */
 239         sk_refcnt_debug_inc(sk);
 240
 241         if (inet->inet_num) {
 242                 /* It assumes that any protocol which allows
 243                  * the user to assign a number at socket
 244                  * creation time automatically shares.
 245                  */
 246                 inet->inet_sport = htons(inet->inet_num);
 247                 err = sk->sk_prot->hash(sk);
 248                 if (err) {
 249                         sk_common_release(sk);
 250                         goto out;
 251                 }
 252         }
 253         if (sk->sk_prot->init) {
 254                 err = sk->sk_prot->init(sk);
 255                 if (err) {
 256                         sk_common_release(sk);
 257                         goto out;
 258                 }
 259         }
 260 out:
 261         return err;
 262 out_rcu_unlock:
 263         rcu_read_unlock();
 264         goto out;
 265 }
 266
 267
 268 /* bind for INET6 API */
 269 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 270 {
 271         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
 272         struct sock *sk = sock->sk;
 273         struct inet_sock *inet = inet_sk(sk);
 274         struct ipv6_pinfo *np = inet6_sk(sk);
 275         struct net *net = sock_net(sk);
 276         __be32 v4addr = 0;
 277         unsigned short snum;
 278         int addr_type = 0;
 279         int err = 0;
 280
 281         /* If the socket has its own bind function then use it. */
 282         if (sk->sk_prot->bind)
 283                 return sk->sk_prot->bind(sk, uaddr, addr_len);
 284
 285         if (addr_len < SIN6_LEN_RFC2133)
 286                 return -EINVAL;
 287
 288         if (addr->sin6_family != AF_INET6)
 289                 return -EAFNOSUPPORT;
 290
 291         addr_type = ipv6_addr_type(&addr->sin6_addr);
 292         if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
 293                 return -EINVAL;
 294
 295         snum = ntohs(addr->sin6_port);
 296         if (snum && snum < PROT_SOCK && !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
 297                 return -EACCES;
 298
 299         lock_sock(sk);
 300
 301         /* Check these errors (active socket, double bind). */
 302         if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
 303                 err = -EINVAL;
 304                 goto out;
 305         }
 306
 307         /* Check if the address belongs to the host. */
 308         if (addr_type == IPV6_ADDR_MAPPED) {
 309                 int chk_addr_ret;
 310
 311                 /* Binding to v4-mapped address on a v6-only socket
 312                  * makes no sense
 313                  */
 314                 if (sk->sk_ipv6only) {
 315                         err = -EINVAL;
 316                         goto out;
 317                 }
 318
 319                 /* Reproduce AF_INET checks to make the bindings consistent */
 320                 v4addr = addr->sin6_addr.s6_addr32[3];
 321                 chk_addr_ret = inet_addr_type(net, v4addr);
 322                 if (!net->ipv4.sysctl_ip_nonlocal_bind &&
 323                     !(inet->freebind || inet->transparent) &&
 324                     v4addr != htonl(INADDR_ANY) &&
 325                     chk_addr_ret != RTN_LOCAL &&
 326                     chk_addr_ret != RTN_MULTICAST &&
 327                     chk_addr_ret != RTN_BROADCAST) {
 328                         err = -EADDRNOTAVAIL;
 329                         goto out;
 330                 }
 331         } else {
 332                 if (addr_type != IPV6_ADDR_ANY) {
 333                         struct net_device *dev = NULL;
 334
 335                         rcu_read_lock();
 336                         if (__ipv6_addr_needs_scope_id(addr_type)) {
 337                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 338                                     addr->sin6_scope_id) {
 339                                         /* Override any existing binding, if another one
 340                                          * is supplied by user.
 341                                          */
 342                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
 343                                 }
 344
 345                                 /* Binding to link-local address requires an interface */
 346                                 if (!sk->sk_bound_dev_if) {
 347                                         err = -EINVAL;
 348                                         goto out_unlock;
 349                                 }
 350                                 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
 351                                 if (!dev) {
 352                                         err = -ENODEV;
 353                                         goto out_unlock;
 354                                 }
 355                         }
 356
 357                         /* ipv4 addr of the socket is invalid.  Only the
 358                          * unspecified and mapped address have a v4 equivalent.
 359                          */
 360                         v4addr = LOOPBACK4_IPV6;
 361                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
 362                                 if (!net->ipv6.sysctl.ip_nonlocal_bind &&
 363                                     !(inet->freebind || inet->transparent) &&
 364                                     !ipv6_chk_addr(net, &addr->sin6_addr,
 365                                                    dev, 0)) {
 366                                         err = -EADDRNOTAVAIL;
 367                                         goto out_unlock;
 368                                 }
 369                         }
 370                         rcu_read_unlock();
 371                 }
 372         }
 373
 374         inet->inet_rcv_saddr = v4addr;
 375         inet->inet_saddr = v4addr;
 376
 377         sk->sk_v6_rcv_saddr = addr->sin6_addr;
 378
 379         if (!(addr_type & IPV6_ADDR_MULTICAST))
 380                 np->saddr = addr->sin6_addr;
 381
 382         /* Make sure we are allowed to bind here. */
 383         if ((snum || !inet->bind_address_no_port) &&
 384             sk->sk_prot->get_port(sk, snum)) {
 385                 inet_reset_saddr(sk);
 386                 err = -EADDRINUSE;
 387                 goto out;
 388         }
 389
 390         if (addr_type != IPV6_ADDR_ANY) {
 391                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
 392                 if (addr_type != IPV6_ADDR_MAPPED)
 393                         sk->sk_ipv6only = 1;
 394         }
 395         if (snum)
 396                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
 397         inet->inet_sport = htons(inet->inet_num);
 398         inet->inet_dport = 0;
 399         inet->inet_daddr = 0;
 400 out:
 401         release_sock(sk);
 402         return err;
 403 out_unlock:
 404         rcu_read_unlock();
 405         goto out;
 406 }
 407 EXPORT_SYMBOL(inet6_bind);
 408
 409 int inet6_release(struct socket *sock)
 410 {
 411         struct sock *sk = sock->sk;
 412
 413         if (!sk)
 414                 return -EINVAL;
 415
 416         /* Free mc lists */
 417         ipv6_sock_mc_close(sk);
 418
 419         /* Free ac lists */
 420         ipv6_sock_ac_close(sk);
 421
 422         return inet_release(sock);
 423 }
 424 EXPORT_SYMBOL(inet6_release);
 425
 426 void inet6_destroy_sock(struct sock *sk)
 427 {
 428         struct ipv6_pinfo *np = inet6_sk(sk);
 429         struct sk_buff *skb;
 430         struct ipv6_txoptions *opt;
 431
 432         /* Release rx options */
 433
 434         skb = xchg(&np->pktoptions, NULL);
 435         if (skb)
 436                 kfree_skb(skb);
 437
 438         skb = xchg(&np->rxpmtu, NULL);
 439         if (skb)
 440                 kfree_skb(skb);
 441
 442         /* Free flowlabels */
 443         fl6_free_socklist(sk);
 444
 445         /* Free tx options */
 446
 447         opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL);
 448         if (opt) {
 449                 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 450                 txopt_put(opt);
 451         }
 452 }
 453 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
 454
 455 /*
 456  *      This does both peername and sockname.
 457  */
 458
 459 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 460                  int *uaddr_len, int peer)
 461 {
 462         struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
 463         struct sock *sk = sock->sk;
 464         struct inet_sock *inet = inet_sk(sk);
 465         struct ipv6_pinfo *np = inet6_sk(sk);
 466
 467         sin->sin6_family = AF_INET6;
 468         sin->sin6_flowinfo = 0;
 469         sin->sin6_scope_id = 0;
 470         if (peer) {
 471                 if (!inet->inet_dport)
 472                         return -ENOTCONN;
 473                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
 474                     peer == 1)
 475                         return -ENOTCONN;
 476                 sin->sin6_port = inet->inet_dport;
 477                 sin->sin6_addr = sk->sk_v6_daddr;
 478                 if (np->sndflow)
 479                         sin->sin6_flowinfo = np->flow_label;
 480         } else {
 481                 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
 482                         sin->sin6_addr = np->saddr;
 483                 else
 484                         sin->sin6_addr = sk->sk_v6_rcv_saddr;
 485
 486                 sin->sin6_port = inet->inet_sport;
 487         }
 488         sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
 489                                                  sk->sk_bound_dev_if);
 490         *uaddr_len = sizeof(*sin);
 491         return 0;
 492 }
 493 EXPORT_SYMBOL(inet6_getname);
 494
 495 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 496 {
 497         struct sock *sk = sock->sk;
 498         struct net *net = sock_net(sk);
 499
 500         switch (cmd) {
 501         case SIOCGSTAMP:
 502                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
 503
 504         case SIOCGSTAMPNS:
 505                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
 506
 507         case SIOCADDRT:
 508         case SIOCDELRT:
 509
 510                 return ipv6_route_ioctl(net, cmd, (void __user *)arg);
 511
 512         case SIOCSIFADDR:
 513                 return addrconf_add_ifaddr(net, (void __user *) arg);
 514         case SIOCDIFADDR:
 515                 return addrconf_del_ifaddr(net, (void __user *) arg);
 516         case SIOCSIFDSTADDR:
 517                 return addrconf_set_dstaddr(net, (void __user *) arg);
 518         default:
 519                 if (!sk->sk_prot->ioctl)
 520                         return -ENOIOCTLCMD;
 521                 return sk->sk_prot->ioctl(sk, cmd, arg);
 522         }
 523         /*NOTREACHED*/
 524         return 0;
 525 }
 526 EXPORT_SYMBOL(inet6_ioctl);
 527
 528 const struct proto_ops inet6_stream_ops = {
 529         .family            = PF_INET6,
 530         .owner             = THIS_MODULE,
 531         .release           = inet6_release,
 532         .bind              = inet6_bind,
 533         .connect           = inet_stream_connect,       /* ok           */
 534         .socketpair        = sock_no_socketpair,        /* a do nothing */
 535         .accept            = inet_accept,               /* ok           */
 536         .getname           = inet6_getname,
 537         .poll              = tcp_poll,                  /* ok           */
 538         .ioctl             = inet6_ioctl,               /* must change  */
 539         .listen            = inet_listen,               /* ok           */
 540         .shutdown          = inet_shutdown,             /* ok           */
 541         .setsockopt        = sock_common_setsockopt,    /* ok           */
 542         .getsockopt        = sock_common_getsockopt,    /* ok           */
 543         .sendmsg           = inet_sendmsg,              /* ok           */
 544         .recvmsg           = inet_recvmsg,              /* ok           */
 545         .mmap              = sock_no_mmap,
 546         .sendpage          = inet_sendpage,
 547         .splice_read       = tcp_splice_read,
 548         .read_sock         = tcp_read_sock,
 549         .peek_len          = tcp_peek_len,
 550 #ifdef CONFIG_COMPAT
 551         .compat_setsockopt = compat_sock_common_setsockopt,
 552         .compat_getsockopt = compat_sock_common_getsockopt,
 553 #endif
 554 };
 555
 556 const struct proto_ops inet6_dgram_ops = {
 557         .family            = PF_INET6,
 558         .owner             = THIS_MODULE,
 559         .release           = inet6_release,
 560         .bind              = inet6_bind,
 561         .connect           = inet_dgram_connect,        /* ok           */
 562         .socketpair        = sock_no_socketpair,        /* a do nothing */
 563         .accept            = sock_no_accept,            /* a do nothing */
 564         .getname           = inet6_getname,
 565         .poll              = udp_poll,                  /* ok           */
 566         .ioctl             = inet6_ioctl,               /* must change  */
 567         .listen            = sock_no_listen,            /* ok           */
 568         .shutdown          = inet_shutdown,             /* ok           */
 569         .setsockopt        = sock_common_setsockopt,    /* ok           */
 570         .getsockopt        = sock_common_getsockopt,    /* ok           */
 571         .sendmsg           = inet_sendmsg,              /* ok           */
 572         .recvmsg           = inet_recvmsg,              /* ok           */
 573         .mmap              = sock_no_mmap,
 574         .sendpage          = sock_no_sendpage,
 575         .set_peek_off      = sk_set_peek_off,
 576 #ifdef CONFIG_COMPAT
 577         .compat_setsockopt = compat_sock_common_setsockopt,
 578         .compat_getsockopt = compat_sock_common_getsockopt,
 579 #endif
 580 };
 581
 582 static const struct net_proto_family inet6_family_ops = {
 583         .family = PF_INET6,
 584         .create = inet6_create,
 585         .owner  = THIS_MODULE,
 586 };
 587
 588 int inet6_register_protosw(struct inet_protosw *p)
 589 {
 590         struct list_head *lh;
 591         struct inet_protosw *answer;
 592         struct list_head *last_perm;
 593         int protocol = p->protocol;
 594         int ret;
 595
 596         spin_lock_bh(&inetsw6_lock);
 597
 598         ret = -EINVAL;
 599         if (p->type >= SOCK_MAX)
 600                 goto out_illegal;
 601
 602         /* If we are trying to override a permanent protocol, bail. */
 603         answer = NULL;
 604         ret = -EPERM;
 605         last_perm = &inetsw6[p->type];
 606         list_for_each(lh, &inetsw6[p->type]) {
 607                 answer = list_entry(lh, struct inet_protosw, list);
 608
 609                 /* Check only the non-wild match. */
 610                 if (INET_PROTOSW_PERMANENT & answer->flags) {
 611                         if (protocol == answer->protocol)
 612                                 break;
 613                         last_perm = lh;
 614                 }
 615
 616                 answer = NULL;
 617         }
 618         if (answer)
 619                 goto out_permanent;
 620
 621         /* Add the new entry after the last permanent entry if any, so that
 622          * the new entry does not override a permanent entry when matched with
 623          * a wild-card protocol. But it is allowed to override any existing
 624          * non-permanent entry.  This means that when we remove this entry, the
 625          * system automatically returns to the old behavior.
 626          */
 627         list_add_rcu(&p->list, last_perm);
 628         ret = 0;
 629 out:
 630         spin_unlock_bh(&inetsw6_lock);
 631         return ret;
 632
 633 out_permanent:
 634         pr_err("Attempt to override permanent protocol %d\n", protocol);
 635         goto out;
 636
 637 out_illegal:
 638         pr_err("Ignoring attempt to register invalid socket type %d\n",
 639                p->type);
 640         goto out;
 641 }
 642 EXPORT_SYMBOL(inet6_register_protosw);
 643
 644 void
 645 inet6_unregister_protosw(struct inet_protosw *p)
 646 {
 647         if (INET_PROTOSW_PERMANENT & p->flags) {
 648                 pr_err("Attempt to unregister permanent protocol %d\n",
 649                        p->protocol);
 650         } else {
 651                 spin_lock_bh(&inetsw6_lock);
 652                 list_del_rcu(&p->list);
 653                 spin_unlock_bh(&inetsw6_lock);
 654
 655                 synchronize_net();
 656         }
 657 }
 658 EXPORT_SYMBOL(inet6_unregister_protosw);
 659
 660 int inet6_sk_rebuild_header(struct sock *sk)
 661 {
 662         struct ipv6_pinfo *np = inet6_sk(sk);
 663         struct dst_entry *dst;
 664
 665         dst = __sk_dst_check(sk, np->dst_cookie);
 666
 667         if (!dst) {
 668                 struct inet_sock *inet = inet_sk(sk);
 669                 struct in6_addr *final_p, final;
 670                 struct flowi6 fl6;
 671
 672                 memset(&fl6, 0, sizeof(fl6));
 673                 fl6.flowi6_proto = sk->sk_protocol;
 674                 fl6.daddr = sk->sk_v6_daddr;
 675                 fl6.saddr = np->saddr;
 676                 fl6.flowlabel = np->flow_label;
 677                 fl6.flowi6_oif = sk->sk_bound_dev_if;
 678                 fl6.flowi6_mark = sk->sk_mark;
 679                 fl6.fl6_dport = inet->inet_dport;
 680                 fl6.fl6_sport = inet->inet_sport;
 681                 fl6.flowi6_uid = sk->sk_uid;
 682                 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
 683
 684                 rcu_read_lock();
 685                 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt),
 686                                          &final);
 687                 rcu_read_unlock();
 688
 689                 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
 690                 if (IS_ERR(dst)) {
 691                         sk->sk_route_caps = 0;
 692                         sk->sk_err_soft = -PTR_ERR(dst);
 693                         return PTR_ERR(dst);
 694                 }
 695
 696                 ip6_dst_store(sk, dst, NULL, NULL);
 697         }
 698
 699         return 0;
 700 }
 701 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
 702
 703 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
 704                        const struct inet6_skb_parm *opt)
 705 {
 706         const struct ipv6_pinfo *np = inet6_sk(sk);
 707
 708         if (np->rxopt.all) {
 709                 if (((opt->flags & IP6SKB_HOPBYHOP) &&
 710                      (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) ||
 711                     (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) &&
 712                      np->rxopt.bits.rxflow) ||
 713                     (opt->srcrt && (np->rxopt.bits.srcrt ||
 714                      np->rxopt.bits.osrcrt)) ||
 715                     ((opt->dst1 || opt->dst0) &&
 716                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
 717                         return true;
 718         }
 719         return false;
 720 }
 721 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
 722
 723 static struct packet_type ipv6_packet_type __read_mostly = {
 724         .type = cpu_to_be16(ETH_P_IPV6),
 725         .func = ipv6_rcv,
 726 };
 727
 728 static int __init ipv6_packet_init(void)
 729 {
 730         dev_add_pack(&ipv6_packet_type);
 731         return 0;
 732 }
 733
 734 static void ipv6_packet_cleanup(void)
 735 {
 736         dev_remove_pack(&ipv6_packet_type);
 737 }
 738
 739 static int __net_init ipv6_init_mibs(struct net *net)
 740 {
 741         int i;
 742
 743         net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib);
 744         if (!net->mib.udp_stats_in6)
 745                 return -ENOMEM;
 746         net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib);
 747         if (!net->mib.udplite_stats_in6)
 748                 goto err_udplite_mib;
 749         net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib);
 750         if (!net->mib.ipv6_statistics)
 751                 goto err_ip_mib;
 752
 753         for_each_possible_cpu(i) {
 754                 struct ipstats_mib *af_inet6_stats;
 755                 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i);
 756                 u64_stats_init(&af_inet6_stats->syncp);
 757         }
 758
 759
 760         net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib);
 761         if (!net->mib.icmpv6_statistics)
 762                 goto err_icmp_mib;
 763         net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
 764                                                 GFP_KERNEL);
 765         if (!net->mib.icmpv6msg_statistics)
 766                 goto err_icmpmsg_mib;
 767         return 0;
 768
 769 err_icmpmsg_mib:
 770         free_percpu(net->mib.icmpv6_statistics);
 771 err_icmp_mib:
 772         free_percpu(net->mib.ipv6_statistics);
 773 err_ip_mib:
 774         free_percpu(net->mib.udplite_stats_in6);
 775 err_udplite_mib:
 776         free_percpu(net->mib.udp_stats_in6);
 777         return -ENOMEM;
 778 }
 779
 780 static void ipv6_cleanup_mibs(struct net *net)
 781 {
 782         free_percpu(net->mib.udp_stats_in6);
 783         free_percpu(net->mib.udplite_stats_in6);
 784         free_percpu(net->mib.ipv6_statistics);
 785         free_percpu(net->mib.icmpv6_statistics);
 786         kfree(net->mib.icmpv6msg_statistics);
 787 }
 788
 789 static int __net_init inet6_net_init(struct net *net)
 790 {
 791         int err = 0;
 792
 793         net->ipv6.sysctl.bindv6only = 0;
 794         net->ipv6.sysctl.icmpv6_time = 1*HZ;
 795         net->ipv6.sysctl.flowlabel_consistency = 1;
 796         net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS;
 797         net->ipv6.sysctl.idgen_retries = 3;
 798         net->ipv6.sysctl.idgen_delay = 1 * HZ;
 799         net->ipv6.sysctl.flowlabel_state_ranges = 0;
 800         atomic_set(&net->ipv6.fib6_sernum, 1);
 801
 802         err = ipv6_init_mibs(net);
 803         if (err)
 804                 return err;
 805 #ifdef CONFIG_PROC_FS
 806         err = udp6_proc_init(net);
 807         if (err)
 808                 goto out;
 809         err = tcp6_proc_init(net);
 810         if (err)
 811                 goto proc_tcp6_fail;
 812         err = ac6_proc_init(net);
 813         if (err)
 814                 goto proc_ac6_fail;
 815 #endif
 816         return err;
 817
 818 #ifdef CONFIG_PROC_FS
 819 proc_ac6_fail:
 820         tcp6_proc_exit(net);
 821 proc_tcp6_fail:
 822         udp6_proc_exit(net);
 823 out:
 824         ipv6_cleanup_mibs(net);
 825         return err;
 826 #endif
 827 }
 828
 829 static void __net_exit inet6_net_exit(struct net *net)
 830 {
 831 #ifdef CONFIG_PROC_FS
 832         udp6_proc_exit(net);
 833         tcp6_proc_exit(net);
 834         ac6_proc_exit(net);
 835 #endif
 836         ipv6_cleanup_mibs(net);
 837 }
 838
 839 static struct pernet_operations inet6_net_ops = {
 840         .init = inet6_net_init,
 841         .exit = inet6_net_exit,
 842 };
 843
 844 static const struct ipv6_stub ipv6_stub_impl = {
 845         .ipv6_sock_mc_join = ipv6_sock_mc_join,
 846         .ipv6_sock_mc_drop = ipv6_sock_mc_drop,
 847         .ipv6_dst_lookup = ip6_dst_lookup,
 848         .udpv6_encap_enable = udpv6_encap_enable,
 849         .ndisc_send_na = ndisc_send_na,
 850         .nd_tbl = &nd_tbl,
 851 };
 852
 853 static int __init inet6_init(void)
 854 {
 855         struct list_head *r;
 856         int err = 0;
 857
 858         sock_skb_cb_check_size(sizeof(struct inet6_skb_parm));
 859
 860         /* Register the socket-side information for inet6_create.  */
 861         for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
 862                 INIT_LIST_HEAD(r);
 863
 864         if (disable_ipv6_mod) {
 865                 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
 866                 goto out;
 867         }
 868
 869         err = proto_register(&tcpv6_prot, 1);
 870         if (err)
 871                 goto out;
 872
 873         err = proto_register(&udpv6_prot, 1);
 874         if (err)
 875                 goto out_unregister_tcp_proto;
 876
 877         err = proto_register(&udplitev6_prot, 1);
 878         if (err)
 879                 goto out_unregister_udp_proto;
 880
 881         err = proto_register(&rawv6_prot, 1);
 882         if (err)
 883                 goto out_unregister_udplite_proto;
 884
 885         err = proto_register(&pingv6_prot, 1);
 886         if (err)
 887                 goto out_unregister_ping_proto;
 888
 889         /* We MUST register RAW sockets before we create the ICMP6,
 890          * IGMP6, or NDISC control sockets.
 891          */
 892         err = rawv6_init();
 893         if (err)
 894                 goto out_unregister_raw_proto;
 895
 896         /* Register the family here so that the init calls below will
 897          * be able to create sockets. (?? is this dangerous ??)
 898          */
 899         err = sock_register(&inet6_family_ops);
 900         if (err)
 901                 goto out_sock_register_fail;
 902
 903         /*
 904          *      ipngwg API draft makes clear that the correct semantics
 905          *      for TCP and UDP is to consider one TCP and UDP instance
 906          *      in a host available by both INET and INET6 APIs and
 907          *      able to communicate via both network protocols.
 908          */
 909
 910         err = register_pernet_subsys(&inet6_net_ops);
 911         if (err)
 912                 goto register_pernet_fail;
 913         err = icmpv6_init();
 914         if (err)
 915                 goto icmp_fail;
 916         err = ip6_mr_init();
 917         if (err)
 918                 goto ipmr_fail;
 919         err = ndisc_init();
 920         if (err)
 921                 goto ndisc_fail;
 922         err = igmp6_init();
 923         if (err)
 924                 goto igmp_fail;
 925
 926         ipv6_stub = &ipv6_stub_impl;
 927
 928         err = ipv6_netfilter_init();
 929         if (err)
 930                 goto netfilter_fail;
 931         /* Create /proc/foo6 entries. */
 932 #ifdef CONFIG_PROC_FS
 933         err = -ENOMEM;
 934         if (raw6_proc_init())
 935                 goto proc_raw6_fail;
 936         if (udplite6_proc_init())
 937                 goto proc_udplite6_fail;
 938         if (ipv6_misc_proc_init())
 939                 goto proc_misc6_fail;
 940         if (if6_proc_init())
 941                 goto proc_if6_fail;
 942 #endif
 943         err = ip6_route_init();
 944         if (err)
 945                 goto ip6_route_fail;
 946         err = ndisc_late_init();
 947         if (err)
 948                 goto ndisc_late_fail;
 949         err = ip6_flowlabel_init();
 950         if (err)
 951                 goto ip6_flowlabel_fail;
 952         err = addrconf_init();
 953         if (err)
 954                 goto addrconf_fail;
 955
 956         /* Init v6 extension headers. */
 957         err = ipv6_exthdrs_init();
 958         if (err)
 959                 goto ipv6_exthdrs_fail;
 960
 961         err = ipv6_frag_init();
 962         if (err)
 963                 goto ipv6_frag_fail;
 964
 965         /* Init v6 transport protocols. */
 966         err = udpv6_init();
 967         if (err)
 968                 goto udpv6_fail;
 969
 970         err = udplitev6_init();
 971         if (err)
 972                 goto udplitev6_fail;
 973
 974         err = udpv6_offload_init();
 975         if (err)
 976                 goto udpv6_offload_fail;
 977
 978         err = tcpv6_init();
 979         if (err)
 980                 goto tcpv6_fail;
 981
 982         err = ipv6_packet_init();
 983         if (err)
 984                 goto ipv6_packet_fail;
 985
 986         err = pingv6_init();
 987         if (err)
 988                 goto pingv6_fail;
 989
 990         err = calipso_init();
 991         if (err)
 992                 goto calipso_fail;
 993
 994 #ifdef CONFIG_SYSCTL
 995         err = ipv6_sysctl_register();
 996         if (err)
 997                 goto sysctl_fail;
 998 #endif
 999 out:
1000         return err;
1001
1002 #ifdef CONFIG_SYSCTL
1003 sysctl_fail:
1004         calipso_exit();
1005 #endif
1006 calipso_fail:
1007         pingv6_exit();
1008 pingv6_fail:
1009         ipv6_packet_cleanup();
1010 ipv6_packet_fail:
1011         tcpv6_exit();
1012 tcpv6_fail:
1013         udpv6_offload_exit();
1014 udpv6_offload_fail:
1015         udplitev6_exit();
1016 udplitev6_fail:
1017         udpv6_exit();
1018 udpv6_fail:
1019         ipv6_frag_exit();
1020 ipv6_frag_fail:
1021         ipv6_exthdrs_exit();
1022 ipv6_exthdrs_fail:
1023         addrconf_cleanup();
1024 addrconf_fail:
1025         ip6_flowlabel_cleanup();
1026 ip6_flowlabel_fail:
1027         ndisc_late_cleanup();
1028 ndisc_late_fail:
1029         ip6_route_cleanup();
1030 ip6_route_fail:
1031 #ifdef CONFIG_PROC_FS
1032         if6_proc_exit();
1033 proc_if6_fail:
1034         ipv6_misc_proc_exit();
1035 proc_misc6_fail:
1036         udplite6_proc_exit();
1037 proc_udplite6_fail:
1038         raw6_proc_exit();
1039 proc_raw6_fail:
1040 #endif
1041         ipv6_netfilter_fini();
1042 netfilter_fail:
1043         igmp6_cleanup();
1044 igmp_fail:
1045         ndisc_cleanup();
1046 ndisc_fail:
1047         ip6_mr_cleanup();
1048 ipmr_fail:
1049         icmpv6_cleanup();
1050 icmp_fail:
1051         unregister_pernet_subsys(&inet6_net_ops);
1052 register_pernet_fail:
1053         sock_unregister(PF_INET6);
1054         rtnl_unregister_all(PF_INET6);
1055 out_sock_register_fail:
1056         rawv6_exit();
1057 out_unregister_ping_proto:
1058         proto_unregister(&pingv6_prot);
1059 out_unregister_raw_proto:
1060         proto_unregister(&rawv6_prot);
1061 out_unregister_udplite_proto:
1062         proto_unregister(&udplitev6_prot);
1063 out_unregister_udp_proto:
1064         proto_unregister(&udpv6_prot);
1065 out_unregister_tcp_proto:
1066         proto_unregister(&tcpv6_prot);
1067         goto out;
1068 }
1069 module_init(inet6_init);
1070
1071 MODULE_ALIAS_NETPROTO(PF_INET6);