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         if (protocol < 0 || protocol >= IPPROTO_MAX)
 113                 return -EINVAL;
 114
 115         /* Look for the requested type/protocol pair. */
 116 lookup_protocol:
 117         err = -ESOCKTNOSUPPORT;
 118         rcu_read_lock();
 119         list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
 120
 121                 err = 0;
 122                 /* Check the non-wild match. */
 123                 if (protocol == answer->protocol) {
 124                         if (protocol != IPPROTO_IP)
 125                                 break;
 126                 } else {
 127                         /* Check for the two wild cases. */
 128                         if (IPPROTO_IP == protocol) {
 129                                 protocol = answer->protocol;
 130                                 break;
 131                         }
 132                         if (IPPROTO_IP == answer->protocol)
 133                                 break;
 134                 }
 135                 err = -EPROTONOSUPPORT;
 136         }
 137
 138         if (err) {
 139                 if (try_loading_module < 2) {
 140                         rcu_read_unlock();
 141                         /*
 142                          * Be more specific, e.g. net-pf-10-proto-132-type-1
 143                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
 144                          */
 145                         if (++try_loading_module == 1)
 146                                 request_module("net-pf-%d-proto-%d-type-%d",
 147                                                 PF_INET6, protocol, sock->type);
 148                         /*
 149                          * Fall back to generic, e.g. net-pf-10-proto-132
 150                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
 151                          */
 152                         else
 153                                 request_module("net-pf-%d-proto-%d",
 154                                                 PF_INET6, protocol);
 155                         goto lookup_protocol;
 156                 } else
 157                         goto out_rcu_unlock;
 158         }
 159
 160         err = -EPERM;
 161         if (sock->type == SOCK_RAW && !kern &&
 162             !ns_capable(net->user_ns, CAP_NET_RAW))
 163                 goto out_rcu_unlock;
 164
 165         sock->ops = answer->ops;
 166         answer_prot = answer->prot;
 167         answer_flags = answer->flags;
 168         rcu_read_unlock();
 169
 170         WARN_ON(!answer_prot->slab);
 171
 172         err = -ENOBUFS;
 173         sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern);
 174         if (!sk)
 175                 goto out;
 176
 177         sock_init_data(sock, sk);
 178
 179         err = 0;
 180         if (INET_PROTOSW_REUSE & answer_flags)
 181                 sk->sk_reuse = SK_CAN_REUSE;
 182
 183         inet = inet_sk(sk);
 184         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
 185
 186         if (SOCK_RAW == sock->type) {
 187                 inet->inet_num = protocol;
 188                 if (IPPROTO_RAW == protocol)
 189                         inet->hdrincl = 1;
 190         }
 191
 192         sk->sk_destruct         = inet_sock_destruct;
 193         sk->sk_family           = PF_INET6;
 194         sk->sk_protocol         = protocol;
 195
 196         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
 197
 198         inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
 199         np->hop_limit   = -1;
 200         np->mcast_hops  = IPV6_DEFAULT_MCASTHOPS;
 201         np->mc_loop     = 1;
 202         np->pmtudisc    = IPV6_PMTUDISC_WANT;
 203         sk->sk_ipv6only = net->ipv6.sysctl.bindv6only;
 204
 205         /* Init the ipv4 part of the socket since we can have sockets
 206          * using v6 API for ipv4.
 207          */
 208         inet->uc_ttl    = -1;
 209
 210         inet->mc_loop   = 1;
 211         inet->mc_ttl    = 1;
 212         inet->mc_index  = 0;
 213         inet->mc_list   = NULL;
 214         inet->rcv_tos   = 0;
 215
 216         if (net->ipv4.sysctl_ip_no_pmtu_disc)
 217                 inet->pmtudisc = IP_PMTUDISC_DONT;
 218         else
 219                 inet->pmtudisc = IP_PMTUDISC_WANT;
 220         /*
 221          * Increment only the relevant sk_prot->socks debug field, this changes
 222          * the previous behaviour of incrementing both the equivalent to
 223          * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
 224          *
 225          * This allows better debug granularity as we'll know exactly how many
 226          * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
 227          * transport protocol socks. -acme
 228          */
 229         sk_refcnt_debug_inc(sk);
 230
 231         if (inet->inet_num) {
 232                 /* It assumes that any protocol which allows
 233                  * the user to assign a number at socket
 234                  * creation time automatically shares.
 235                  */
 236                 inet->inet_sport = htons(inet->inet_num);
 237                 sk->sk_prot->hash(sk);
 238         }
 239         if (sk->sk_prot->init) {
 240                 err = sk->sk_prot->init(sk);
 241                 if (err) {
 242                         sk_common_release(sk);
 243                         goto out;
 244                 }
 245         }
 246 out:
 247         return err;
 248 out_rcu_unlock:
 249         rcu_read_unlock();
 250         goto out;
 251 }
 252
 253
 254 /* bind for INET6 API */
 255 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 256 {
 257         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
 258         struct sock *sk = sock->sk;
 259         struct inet_sock *inet = inet_sk(sk);
 260         struct ipv6_pinfo *np = inet6_sk(sk);
 261         struct net *net = sock_net(sk);
 262         __be32 v4addr = 0;
 263         unsigned short snum;
 264         int addr_type = 0;
 265         int err = 0;
 266
 267         /* If the socket has its own bind function then use it. */
 268         if (sk->sk_prot->bind)
 269                 return sk->sk_prot->bind(sk, uaddr, addr_len);
 270
 271         if (addr_len < SIN6_LEN_RFC2133)
 272                 return -EINVAL;
 273
 274         if (addr->sin6_family != AF_INET6)
 275                 return -EAFNOSUPPORT;
 276
 277         addr_type = ipv6_addr_type(&addr->sin6_addr);
 278         if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
 279                 return -EINVAL;
 280
 281         snum = ntohs(addr->sin6_port);
 282         if (snum && snum < PROT_SOCK && !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
 283                 return -EACCES;
 284
 285         lock_sock(sk);
 286
 287         /* Check these errors (active socket, double bind). */
 288         if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
 289                 err = -EINVAL;
 290                 goto out;
 291         }
 292
 293         /* Check if the address belongs to the host. */
 294         if (addr_type == IPV6_ADDR_MAPPED) {
 295                 struct net_device *dev = NULL;
 296                 int chk_addr_ret;
 297
 298                 /* Binding to v4-mapped address on a v6-only socket
 299                  * makes no sense
 300                  */
 301                 if (sk->sk_ipv6only) {
 302                         err = -EINVAL;
 303                         goto out;
 304                 }
 305
 306                 rcu_read_lock();
 307                 if (sk->sk_bound_dev_if) {
 308                         dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
 309                         if (!dev) {
 310                                 err = -ENODEV;
 311                                 goto out_unlock;
 312                         }
 313                 }
 314
 315                 /* Reproduce AF_INET checks to make the bindings consistent */
 316                 v4addr = addr->sin6_addr.s6_addr32[3];
 317                 chk_addr_ret = inet_addr_type_dev_table(net, dev, v4addr);
 318                 rcu_read_unlock();
 319
 320                 if (!net->ipv4.sysctl_ip_nonlocal_bind &&
 321                     !(inet->freebind || inet->transparent) &&
 322                     v4addr != htonl(INADDR_ANY) &&
 323                     chk_addr_ret != RTN_LOCAL &&
 324                     chk_addr_ret != RTN_MULTICAST &&
 325                     chk_addr_ret != RTN_BROADCAST) {
 326                         err = -EADDRNOTAVAIL;
 327                         goto out;
 328                 }
 329         } else {
 330                 if (addr_type != IPV6_ADDR_ANY) {
 331                         struct net_device *dev = NULL;
 332
 333                         rcu_read_lock();
 334                         if (__ipv6_addr_needs_scope_id(addr_type)) {
 335                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 336                                     addr->sin6_scope_id) {
 337                                         /* Override any existing binding, if another one
 338                                          * is supplied by user.
 339                                          */
 340                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
 341                                 }
 342
 343                                 /* Binding to link-local address requires an interface */
 344                                 if (!sk->sk_bound_dev_if) {
 345                                         err = -EINVAL;
 346                                         goto out_unlock;
 347                                 }
 348                         }
 349
 350                         if (sk->sk_bound_dev_if) {
 351                                 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
 352                                 if (!dev) {
 353                                         err = -ENODEV;
 354                                         goto out_unlock;
 355                                 }
 356                         }
 357
 358                         /* ipv4 addr of the socket is invalid.  Only the
 359                          * unspecified and mapped address have a v4 equivalent.
 360                          */
 361                         v4addr = LOOPBACK4_IPV6;
 362                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
 363                                 if (!net->ipv6.sysctl.ip_nonlocal_bind &&
 364                                     !(inet->freebind || inet->transparent) &&
 365                                     !ipv6_chk_addr(net, &addr->sin6_addr,
 366                                                    dev, 0)) {
 367                                         err = -EADDRNOTAVAIL;
 368                                         goto out_unlock;
 369                                 }
 370                         }
 371                         rcu_read_unlock();
 372                 }
 373         }
 374
 375         inet->inet_rcv_saddr = v4addr;
 376         inet->inet_saddr = v4addr;
 377
 378         sk->sk_v6_rcv_saddr = addr->sin6_addr;
 379
 380         if (!(addr_type & IPV6_ADDR_MULTICAST))
 381                 np->saddr = addr->sin6_addr;
 382
 383         /* Make sure we are allowed to bind here. */
 384         if ((snum || !inet->bind_address_no_port) &&
 385             sk->sk_prot->get_port(sk, snum)) {
 386                 inet_reset_saddr(sk);
 387                 err = -EADDRINUSE;
 388                 goto out;
 389         }
 390
 391         if (addr_type != IPV6_ADDR_ANY) {
 392                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
 393                 if (addr_type != IPV6_ADDR_MAPPED)
 394                         sk->sk_ipv6only = 1;
 395         }
 396         if (snum)
 397                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
 398         inet->inet_sport = htons(inet->inet_num);
 399         inet->inet_dport = 0;
 400         inet->inet_daddr = 0;
 401 out:
 402         release_sock(sk);
 403         return err;
 404 out_unlock:
 405         rcu_read_unlock();
 406         goto out;
 407 }
 408 EXPORT_SYMBOL(inet6_bind);
 409
 410 int inet6_release(struct socket *sock)
 411 {
 412         struct sock *sk = sock->sk;
 413
 414         if (!sk)
 415                 return -EINVAL;
 416
 417         /* Free mc lists */
 418         ipv6_sock_mc_close(sk);
 419
 420         /* Free ac lists */
 421         ipv6_sock_ac_close(sk);
 422
 423         return inet_release(sock);
 424 }
 425 EXPORT_SYMBOL(inet6_release);
 426
 427 void inet6_destroy_sock(struct sock *sk)
 428 {
 429         struct ipv6_pinfo *np = inet6_sk(sk);
 430         struct sk_buff *skb;
 431         struct ipv6_txoptions *opt;
 432
 433         /* Release rx options */
 434
 435         skb = xchg(&np->pktoptions, NULL);
 436         if (skb)
 437                 kfree_skb(skb);
 438
 439         skb = xchg(&np->rxpmtu, NULL);
 440         if (skb)
 441                 kfree_skb(skb);
 442
 443         /* Free flowlabels */
 444         fl6_free_socklist(sk);
 445
 446         /* Free tx options */
 447
 448         opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL);
 449         if (opt) {
 450                 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 451                 txopt_put(opt);
 452         }
 453 }
 454 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
 455
 456 /*
 457  *      This does both peername and sockname.
 458  */
 459
 460 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 461                  int *uaddr_len, int peer)
 462 {
 463         struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
 464         struct sock *sk = sock->sk;
 465         struct inet_sock *inet = inet_sk(sk);
 466         struct ipv6_pinfo *np = inet6_sk(sk);
 467
 468         sin->sin6_family = AF_INET6;
 469         sin->sin6_flowinfo = 0;
 470         sin->sin6_scope_id = 0;
 471         if (peer) {
 472                 if (!inet->inet_dport)
 473                         return -ENOTCONN;
 474                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
 475                     peer == 1)
 476                         return -ENOTCONN;
 477                 sin->sin6_port = inet->inet_dport;
 478                 sin->sin6_addr = sk->sk_v6_daddr;
 479                 if (np->sndflow)
 480                         sin->sin6_flowinfo = np->flow_label;
 481         } else {
 482                 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
 483                         sin->sin6_addr = np->saddr;
 484                 else
 485                         sin->sin6_addr = sk->sk_v6_rcv_saddr;
 486
 487                 sin->sin6_port = inet->inet_sport;
 488         }
 489         sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
 490                                                  sk->sk_bound_dev_if);
 491         *uaddr_len = sizeof(*sin);
 492         return 0;
 493 }
 494 EXPORT_SYMBOL(inet6_getname);
 495
 496 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 497 {
 498         struct sock *sk = sock->sk;
 499         struct net *net = sock_net(sk);
 500
 501         switch (cmd) {
 502         case SIOCGSTAMP:
 503                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
 504
 505         case SIOCGSTAMPNS:
 506                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
 507
 508         case SIOCADDRT:
 509         case SIOCDELRT:
 510
 511                 return ipv6_route_ioctl(net, cmd, (void __user *)arg);
 512
 513         case SIOCSIFADDR:
 514                 return addrconf_add_ifaddr(net, (void __user *) arg);
 515         case SIOCDIFADDR:
 516                 return addrconf_del_ifaddr(net, (void __user *) arg);
 517         case SIOCSIFDSTADDR:
 518                 return addrconf_set_dstaddr(net, (void __user *) arg);
 519         default:
 520                 if (!sk->sk_prot->ioctl)
 521                         return -ENOIOCTLCMD;
 522                 return sk->sk_prot->ioctl(sk, cmd, arg);
 523         }
 524         /*NOTREACHED*/
 525         return 0;
 526 }
 527 EXPORT_SYMBOL(inet6_ioctl);
 528
 529 const struct proto_ops inet6_stream_ops = {
 530         .family            = PF_INET6,
 531         .owner             = THIS_MODULE,
 532         .release           = inet6_release,
 533         .bind              = inet6_bind,
 534         .connect           = inet_stream_connect,       /* ok           */
 535         .socketpair        = sock_no_socketpair,        /* a do nothing */
 536         .accept            = inet_accept,               /* ok           */
 537         .getname           = inet6_getname,
 538         .poll              = tcp_poll,                  /* ok           */
 539         .ioctl             = inet6_ioctl,               /* must change  */
 540         .listen            = inet_listen,               /* ok           */
 541         .shutdown          = inet_shutdown,             /* ok           */
 542         .setsockopt        = sock_common_setsockopt,    /* ok           */
 543         .getsockopt        = sock_common_getsockopt,    /* ok           */
 544         .sendmsg           = inet_sendmsg,              /* ok           */
 545         .recvmsg           = inet_recvmsg,              /* ok           */
 546         .mmap              = sock_no_mmap,
 547         .sendpage          = inet_sendpage,
 548         .splice_read       = tcp_splice_read,
 549 #ifdef CONFIG_COMPAT
 550         .compat_setsockopt = compat_sock_common_setsockopt,
 551         .compat_getsockopt = compat_sock_common_getsockopt,
 552 #endif
 553 };
 554
 555 const struct proto_ops inet6_dgram_ops = {
 556         .family            = PF_INET6,
 557         .owner             = THIS_MODULE,
 558         .release           = inet6_release,
 559         .bind              = inet6_bind,
 560         .connect           = inet_dgram_connect,        /* ok           */
 561         .socketpair        = sock_no_socketpair,        /* a do nothing */
 562         .accept            = sock_no_accept,            /* a do nothing */
 563         .getname           = inet6_getname,
 564         .poll              = udp_poll,                  /* ok           */
 565         .ioctl             = inet6_ioctl,               /* must change  */
 566         .listen            = sock_no_listen,            /* ok           */
 567         .shutdown          = inet_shutdown,             /* ok           */
 568         .setsockopt        = sock_common_setsockopt,    /* ok           */
 569         .getsockopt        = sock_common_getsockopt,    /* ok           */
 570         .sendmsg           = inet_sendmsg,              /* ok           */
 571         .recvmsg           = inet_recvmsg,              /* ok           */
 572         .mmap              = sock_no_mmap,
 573         .sendpage          = sock_no_sendpage,
 574 #ifdef CONFIG_COMPAT
 575         .compat_setsockopt = compat_sock_common_setsockopt,
 576         .compat_getsockopt = compat_sock_common_getsockopt,
 577 #endif
 578 };
 579
 580 static const struct net_proto_family inet6_family_ops = {
 581         .family = PF_INET6,
 582         .create = inet6_create,
 583         .owner  = THIS_MODULE,
 584 };
 585
 586 int inet6_register_protosw(struct inet_protosw *p)
 587 {
 588         struct list_head *lh;
 589         struct inet_protosw *answer;
 590         struct list_head *last_perm;
 591         int protocol = p->protocol;
 592         int ret;
 593
 594         spin_lock_bh(&inetsw6_lock);
 595
 596         ret = -EINVAL;
 597         if (p->type >= SOCK_MAX)
 598                 goto out_illegal;
 599
 600         /* If we are trying to override a permanent protocol, bail. */
 601         answer = NULL;
 602         ret = -EPERM;
 603         last_perm = &inetsw6[p->type];
 604         list_for_each(lh, &inetsw6[p->type]) {
 605                 answer = list_entry(lh, struct inet_protosw, list);
 606
 607                 /* Check only the non-wild match. */
 608                 if (INET_PROTOSW_PERMANENT & answer->flags) {
 609                         if (protocol == answer->protocol)
 610                                 break;
 611                         last_perm = lh;
 612                 }
 613
 614                 answer = NULL;
 615         }
 616         if (answer)
 617                 goto out_permanent;
 618
 619         /* Add the new entry after the last permanent entry if any, so that
 620          * the new entry does not override a permanent entry when matched with
 621          * a wild-card protocol. But it is allowed to override any existing
 622          * non-permanent entry.  This means that when we remove this entry, the
 623          * system automatically returns to the old behavior.
 624          */
 625         list_add_rcu(&p->list, last_perm);
 626         ret = 0;
 627 out:
 628         spin_unlock_bh(&inetsw6_lock);
 629         return ret;
 630
 631 out_permanent:
 632         pr_err("Attempt to override permanent protocol %d\n", protocol);
 633         goto out;
 634
 635 out_illegal:
 636         pr_err("Ignoring attempt to register invalid socket type %d\n",
 637                p->type);
 638         goto out;
 639 }
 640 EXPORT_SYMBOL(inet6_register_protosw);
 641
 642 void
 643 inet6_unregister_protosw(struct inet_protosw *p)
 644 {
 645         if (INET_PROTOSW_PERMANENT & p->flags) {
 646                 pr_err("Attempt to unregister permanent protocol %d\n",
 647                        p->protocol);
 648         } else {
 649                 spin_lock_bh(&inetsw6_lock);
 650                 list_del_rcu(&p->list);
 651                 spin_unlock_bh(&inetsw6_lock);
 652
 653                 synchronize_net();
 654         }
 655 }
 656 EXPORT_SYMBOL(inet6_unregister_protosw);
 657
 658 int inet6_sk_rebuild_header(struct sock *sk)
 659 {
 660         struct ipv6_pinfo *np = inet6_sk(sk);
 661         struct dst_entry *dst;
 662
 663         dst = __sk_dst_check(sk, np->dst_cookie);
 664
 665         if (!dst) {
 666                 struct inet_sock *inet = inet_sk(sk);
 667                 struct in6_addr *final_p, final;
 668                 struct flowi6 fl6;
 669
 670                 memset(&fl6, 0, sizeof(fl6));
 671                 fl6.flowi6_proto = sk->sk_protocol;
 672                 fl6.daddr = sk->sk_v6_daddr;
 673                 fl6.saddr = np->saddr;
 674                 fl6.flowlabel = np->flow_label;
 675                 fl6.flowi6_oif = sk->sk_bound_dev_if;
 676                 fl6.flowi6_mark = sk->sk_mark;
 677                 fl6.fl6_dport = inet->inet_dport;
 678                 fl6.fl6_sport = inet->inet_sport;
 679                 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
 680
 681                 rcu_read_lock();
 682                 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt),
 683                                          &final);
 684                 rcu_read_unlock();
 685
 686                 dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
 687                 if (IS_ERR(dst)) {
 688                         sk->sk_route_caps = 0;
 689                         sk->sk_err_soft = -PTR_ERR(dst);
 690                         return PTR_ERR(dst);
 691                 }
 692
 693                 ip6_dst_store(sk, dst, NULL, NULL);
 694         }
 695
 696         return 0;
 697 }
 698 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
 699
 700 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
 701                        const struct inet6_skb_parm *opt)
 702 {
 703         const struct ipv6_pinfo *np = inet6_sk(sk);
 704
 705         if (np->rxopt.all) {
 706                 if (((opt->flags & IP6SKB_HOPBYHOP) &&
 707                      (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) ||
 708                     (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) &&
 709                      np->rxopt.bits.rxflow) ||
 710                     (opt->srcrt && (np->rxopt.bits.srcrt ||
 711                      np->rxopt.bits.osrcrt)) ||
 712                     ((opt->dst1 || opt->dst0) &&
 713                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
 714                         return true;
 715         }
 716         return false;
 717 }
 718 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
 719
 720 static struct packet_type ipv6_packet_type __read_mostly = {
 721         .type = cpu_to_be16(ETH_P_IPV6),
 722         .func = ipv6_rcv,
 723 };
 724
 725 static int __init ipv6_packet_init(void)
 726 {
 727         dev_add_pack(&ipv6_packet_type);
 728         return 0;
 729 }
 730
 731 static void ipv6_packet_cleanup(void)
 732 {
 733         dev_remove_pack(&ipv6_packet_type);
 734 }
 735
 736 static int __net_init ipv6_init_mibs(struct net *net)
 737 {
 738         int i;
 739
 740         net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib);
 741         if (!net->mib.udp_stats_in6)
 742                 return -ENOMEM;
 743         net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib);
 744         if (!net->mib.udplite_stats_in6)
 745                 goto err_udplite_mib;
 746         net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib);
 747         if (!net->mib.ipv6_statistics)
 748                 goto err_ip_mib;
 749
 750         for_each_possible_cpu(i) {
 751                 struct ipstats_mib *af_inet6_stats;
 752                 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i);
 753                 u64_stats_init(&af_inet6_stats->syncp);
 754         }
 755
 756
 757         net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib);
 758         if (!net->mib.icmpv6_statistics)
 759                 goto err_icmp_mib;
 760         net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
 761                                                 GFP_KERNEL);
 762         if (!net->mib.icmpv6msg_statistics)
 763                 goto err_icmpmsg_mib;
 764         return 0;
 765
 766 err_icmpmsg_mib:
 767         free_percpu(net->mib.icmpv6_statistics);
 768 err_icmp_mib:
 769         free_percpu(net->mib.ipv6_statistics);
 770 err_ip_mib:
 771         free_percpu(net->mib.udplite_stats_in6);
 772 err_udplite_mib:
 773         free_percpu(net->mib.udp_stats_in6);
 774         return -ENOMEM;
 775 }
 776
 777 static void ipv6_cleanup_mibs(struct net *net)
 778 {
 779         free_percpu(net->mib.udp_stats_in6);
 780         free_percpu(net->mib.udplite_stats_in6);
 781         free_percpu(net->mib.ipv6_statistics);
 782         free_percpu(net->mib.icmpv6_statistics);
 783         kfree(net->mib.icmpv6msg_statistics);
 784 }
 785
 786 static int __net_init inet6_net_init(struct net *net)
 787 {
 788         int err = 0;
 789
 790         net->ipv6.sysctl.bindv6only = 0;
 791         net->ipv6.sysctl.icmpv6_time = 1*HZ;
 792         net->ipv6.sysctl.flowlabel_consistency = 1;
 793         net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS;
 794         net->ipv6.sysctl.idgen_retries = 3;
 795         net->ipv6.sysctl.idgen_delay = 1 * HZ;
 796         net->ipv6.sysctl.flowlabel_state_ranges = 0;
 797         atomic_set(&net->ipv6.fib6_sernum, 1);
 798
 799         err = ipv6_init_mibs(net);
 800         if (err)
 801                 return err;
 802 #ifdef CONFIG_PROC_FS
 803         err = udp6_proc_init(net);
 804         if (err)
 805                 goto out;
 806         err = tcp6_proc_init(net);
 807         if (err)
 808                 goto proc_tcp6_fail;
 809         err = ac6_proc_init(net);
 810         if (err)
 811                 goto proc_ac6_fail;
 812 #endif
 813         return err;
 814
 815 #ifdef CONFIG_PROC_FS
 816 proc_ac6_fail:
 817         tcp6_proc_exit(net);
 818 proc_tcp6_fail:
 819         udp6_proc_exit(net);
 820 out:
 821         ipv6_cleanup_mibs(net);
 822         return err;
 823 #endif
 824 }
 825
 826 static void __net_exit inet6_net_exit(struct net *net)
 827 {
 828 #ifdef CONFIG_PROC_FS
 829         udp6_proc_exit(net);
 830         tcp6_proc_exit(net);
 831         ac6_proc_exit(net);
 832 #endif
 833         ipv6_cleanup_mibs(net);
 834 }
 835
 836 static struct pernet_operations inet6_net_ops = {
 837         .init = inet6_net_init,
 838         .exit = inet6_net_exit,
 839 };
 840
 841 static const struct ipv6_stub ipv6_stub_impl = {
 842         .ipv6_sock_mc_join = ipv6_sock_mc_join,
 843         .ipv6_sock_mc_drop = ipv6_sock_mc_drop,
 844         .ipv6_dst_lookup_flow = ip6_dst_lookup_flow,
 845         .udpv6_encap_enable = udpv6_encap_enable,
 846         .ndisc_send_na = ndisc_send_na,
 847         .nd_tbl = &nd_tbl,
 848 };
 849
 850 static int __init inet6_init(void)
 851 {
 852         struct list_head *r;
 853         int err = 0;
 854
 855         sock_skb_cb_check_size(sizeof(struct inet6_skb_parm));
 856
 857         /* Register the socket-side information for inet6_create.  */
 858         for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
 859                 INIT_LIST_HEAD(r);
 860
 861         if (disable_ipv6_mod) {
 862                 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
 863                 goto out;
 864         }
 865
 866         err = proto_register(&tcpv6_prot, 1);
 867         if (err)
 868                 goto out;
 869
 870         err = proto_register(&udpv6_prot, 1);
 871         if (err)
 872                 goto out_unregister_tcp_proto;
 873
 874         err = proto_register(&udplitev6_prot, 1);
 875         if (err)
 876                 goto out_unregister_udp_proto;
 877
 878         err = proto_register(&rawv6_prot, 1);
 879         if (err)
 880                 goto out_unregister_udplite_proto;
 881
 882         err = proto_register(&pingv6_prot, 1);
 883         if (err)
 884                 goto out_unregister_ping_proto;
 885
 886         /* We MUST register RAW sockets before we create the ICMP6,
 887          * IGMP6, or NDISC control sockets.
 888          */
 889         err = rawv6_init();
 890         if (err)
 891                 goto out_unregister_raw_proto;
 892
 893         /* Register the family here so that the init calls below will
 894          * be able to create sockets. (?? is this dangerous ??)
 895          */
 896         err = sock_register(&inet6_family_ops);
 897         if (err)
 898                 goto out_sock_register_fail;
 899
 900         /*
 901          *      ipngwg API draft makes clear that the correct semantics
 902          *      for TCP and UDP is to consider one TCP and UDP instance
 903          *      in a host available by both INET and INET6 APIs and
 904          *      able to communicate via both network protocols.
 905          */
 906
 907         err = register_pernet_subsys(&inet6_net_ops);
 908         if (err)
 909                 goto register_pernet_fail;
 910         err = ip6_mr_init();
 911         if (err)
 912                 goto ipmr_fail;
 913         err = icmpv6_init();
 914         if (err)
 915                 goto icmp_fail;
 916         err = ndisc_init();
 917         if (err)
 918                 goto ndisc_fail;
 919         err = igmp6_init();
 920         if (err)
 921                 goto igmp_fail;
 922
 923         ipv6_stub = &ipv6_stub_impl;
 924
 925         err = ipv6_netfilter_init();
 926         if (err)
 927                 goto netfilter_fail;
 928         /* Create /proc/foo6 entries. */
 929 #ifdef CONFIG_PROC_FS
 930         err = -ENOMEM;
 931         if (raw6_proc_init())
 932                 goto proc_raw6_fail;
 933         if (udplite6_proc_init())
 934                 goto proc_udplite6_fail;
 935         if (ipv6_misc_proc_init())
 936                 goto proc_misc6_fail;
 937         if (if6_proc_init())
 938                 goto proc_if6_fail;
 939 #endif
 940         err = ip6_route_init();
 941         if (err)
 942                 goto ip6_route_fail;
 943         err = ndisc_late_init();
 944         if (err)
 945                 goto ndisc_late_fail;
 946         err = ip6_flowlabel_init();
 947         if (err)
 948                 goto ip6_flowlabel_fail;
 949         err = addrconf_init();
 950         if (err)
 951                 goto addrconf_fail;
 952
 953         /* Init v6 extension headers. */
 954         err = ipv6_exthdrs_init();
 955         if (err)
 956                 goto ipv6_exthdrs_fail;
 957
 958         err = ipv6_frag_init();
 959         if (err)
 960                 goto ipv6_frag_fail;
 961
 962         /* Init v6 transport protocols. */
 963         err = udpv6_init();
 964         if (err)
 965                 goto udpv6_fail;
 966
 967         err = udplitev6_init();
 968         if (err)
 969                 goto udplitev6_fail;
 970
 971         err = tcpv6_init();
 972         if (err)
 973                 goto tcpv6_fail;
 974
 975         err = ipv6_packet_init();
 976         if (err)
 977                 goto ipv6_packet_fail;
 978
 979         err = pingv6_init();
 980         if (err)
 981                 goto pingv6_fail;
 982
 983 #ifdef CONFIG_SYSCTL
 984         err = ipv6_sysctl_register();
 985         if (err)
 986                 goto sysctl_fail;
 987 #endif
 988 out:
 989         return err;
 990
 991 #ifdef CONFIG_SYSCTL
 992 sysctl_fail:
 993         pingv6_exit();
 994 #endif
 995 pingv6_fail:
 996         ipv6_packet_cleanup();
 997 ipv6_packet_fail:
 998         tcpv6_exit();
 999 tcpv6_fail:
1000         udplitev6_exit();
1001 udplitev6_fail:
1002         udpv6_exit();
1003 udpv6_fail:
1004         ipv6_frag_exit();
1005 ipv6_frag_fail:
1006         ipv6_exthdrs_exit();
1007 ipv6_exthdrs_fail:
1008         addrconf_cleanup();
1009 addrconf_fail:
1010         ip6_flowlabel_cleanup();
1011 ip6_flowlabel_fail:
1012         ndisc_late_cleanup();
1013 ndisc_late_fail:
1014         ip6_route_cleanup();
1015 ip6_route_fail:
1016 #ifdef CONFIG_PROC_FS
1017         if6_proc_exit();
1018 proc_if6_fail:
1019         ipv6_misc_proc_exit();
1020 proc_misc6_fail:
1021         udplite6_proc_exit();
1022 proc_udplite6_fail:
1023         raw6_proc_exit();
1024 proc_raw6_fail:
1025 #endif
1026         ipv6_netfilter_fini();
1027 netfilter_fail:
1028         igmp6_cleanup();
1029 igmp_fail:
1030         ndisc_cleanup();
1031 ndisc_fail:
1032         icmpv6_cleanup();
1033 icmp_fail:
1034         ip6_mr_cleanup();
1035 ipmr_fail:
1036         unregister_pernet_subsys(&inet6_net_ops);
1037 register_pernet_fail:
1038         sock_unregister(PF_INET6);
1039         rtnl_unregister_all(PF_INET6);
1040 out_sock_register_fail:
1041         rawv6_exit();
1042 out_unregister_ping_proto:
1043         proto_unregister(&pingv6_prot);
1044 out_unregister_raw_proto:
1045         proto_unregister(&rawv6_prot);
1046 out_unregister_udplite_proto:
1047         proto_unregister(&udplitev6_prot);
1048 out_unregister_udp_proto:
1049         proto_unregister(&udpv6_prot);
1050 out_unregister_tcp_proto:
1051         proto_unregister(&tcpv6_prot);
1052         goto out;
1053 }
1054 module_init(inet6_init);
1055
1056 MODULE_ALIAS_NETPROTO(PF_INET6);