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