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