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