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