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 #include <net/calipso.h>
  64 #include <net/seg6.h>
  65
  66 #include <linux/uaccess.h>
  67 #include <linux/mroute6.h>
  68
  69 #include "ip6_offload.h"
  70
  71 MODULE_AUTHOR("Cast of dozens");
  72 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
  73 MODULE_LICENSE("GPL");
  74
  75 /* The inetsw6 table contains everything that inet6_create needs to
  76  * build a new socket.
  77  */
  78 static struct list_head inetsw6[SOCK_MAX];
  79 static DEFINE_SPINLOCK(inetsw6_lock);
  80
  81 struct ipv6_params ipv6_defaults = {
  82         .disable_ipv6 = 0,
  83         .autoconf = 1,
  84 };
  85
  86 static int disable_ipv6_mod;
  87
  88 module_param_named(disable, disable_ipv6_mod, int, 0444);
  89 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
  90
  91 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
  92 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
  93
  94 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
  95 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
  96
  97 bool ipv6_mod_enabled(void)
  98 {
  99         return disable_ipv6_mod == 0;
 100 }
 101 EXPORT_SYMBOL_GPL(ipv6_mod_enabled);
 102
 103 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
 104 {
 105         const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
 106
 107         return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
 108 }
 109
 110 static int inet6_create(struct net *net, struct socket *sock, int protocol,
 111                         int kern)
 112 {
 113         struct inet_sock *inet;
 114         struct ipv6_pinfo *np;
 115         struct sock *sk;
 116         struct inet_protosw *answer;
 117         struct proto *answer_prot;
 118         unsigned char answer_flags;
 119         int try_loading_module = 0;
 120         int err;
 121
 122         if (protocol < 0 || protocol >= IPPROTO_MAX)
 123                 return -EINVAL;
 124
 125         /* Look for the requested type/protocol pair. */
 126 lookup_protocol:
 127         err = -ESOCKTNOSUPPORT;
 128         rcu_read_lock();
 129         list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
 130
 131                 err = 0;
 132                 /* Check the non-wild match. */
 133                 if (protocol == answer->protocol) {
 134                         if (protocol != IPPROTO_IP)
 135                                 break;
 136                 } else {
 137                         /* Check for the two wild cases. */
 138                         if (IPPROTO_IP == protocol) {
 139                                 protocol = answer->protocol;
 140                                 break;
 141                         }
 142                         if (IPPROTO_IP == answer->protocol)
 143                                 break;
 144                 }
 145                 err = -EPROTONOSUPPORT;
 146         }
 147
 148         if (err) {
 149                 if (try_loading_module < 2) {
 150                         rcu_read_unlock();
 151                         /*
 152                          * Be more specific, e.g. net-pf-10-proto-132-type-1
 153                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
 154                          */
 155                         if (++try_loading_module == 1)
 156                                 request_module("net-pf-%d-proto-%d-type-%d",
 157                                                 PF_INET6, protocol, sock->type);
 158                         /*
 159                          * Fall back to generic, e.g. net-pf-10-proto-132
 160                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
 161                          */
 162                         else
 163                                 request_module("net-pf-%d-proto-%d",
 164                                                 PF_INET6, protocol);
 165                         goto lookup_protocol;
 166                 } else
 167                         goto out_rcu_unlock;
 168         }
 169
 170         err = -EPERM;
 171         if (sock->type == SOCK_RAW && !kern &&
 172             !ns_capable(net->user_ns, CAP_NET_RAW))
 173                 goto out_rcu_unlock;
 174
 175         sock->ops = answer->ops;
 176         answer_prot = answer->prot;
 177         answer_flags = answer->flags;
 178         rcu_read_unlock();
 179
 180         WARN_ON(!answer_prot->slab);
 181
 182         err = -ENOBUFS;
 183         sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern);
 184         if (!sk)
 185                 goto out;
 186
 187         sock_init_data(sock, sk);
 188
 189         err = 0;
 190         if (INET_PROTOSW_REUSE & answer_flags)
 191                 sk->sk_reuse = SK_CAN_REUSE;
 192
 193         inet = inet_sk(sk);
 194         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
 195
 196         if (SOCK_RAW == sock->type) {
 197                 inet->inet_num = protocol;
 198                 if (IPPROTO_RAW == protocol)
 199                         inet->hdrincl = 1;
 200         }
 201
 202         sk->sk_destruct         = inet_sock_destruct;
 203         sk->sk_family           = PF_INET6;
 204         sk->sk_protocol         = protocol;
 205
 206         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
 207
 208         inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
 209         np->hop_limit   = -1;
 210         np->mcast_hops  = IPV6_DEFAULT_MCASTHOPS;
 211         np->mc_loop     = 1;
 212         np->mc_all      = 1;
 213         np->pmtudisc    = IPV6_PMTUDISC_WANT;
 214         np->repflow     = net->ipv6.sysctl.flowlabel_reflect;
 215         sk->sk_ipv6only = net->ipv6.sysctl.bindv6only;
 216
 217         /* Init the ipv4 part of the socket since we can have sockets
 218          * using v6 API for ipv4.
 219          */
 220         inet->uc_ttl    = -1;
 221
 222         inet->mc_loop   = 1;
 223         inet->mc_ttl    = 1;
 224         inet->mc_index  = 0;
 225         inet->mc_list   = NULL;
 226         inet->rcv_tos   = 0;
 227
 228         if (net->ipv4.sysctl_ip_no_pmtu_disc)
 229                 inet->pmtudisc = IP_PMTUDISC_DONT;
 230         else
 231                 inet->pmtudisc = IP_PMTUDISC_WANT;
 232         /*
 233          * Increment only the relevant sk_prot->socks debug field, this changes
 234          * the previous behaviour of incrementing both the equivalent to
 235          * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
 236          *
 237          * This allows better debug granularity as we'll know exactly how many
 238          * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
 239          * transport protocol socks. -acme
 240          */
 241         sk_refcnt_debug_inc(sk);
 242
 243         if (inet->inet_num) {
 244                 /* It assumes that any protocol which allows
 245                  * the user to assign a number at socket
 246                  * creation time automatically shares.
 247                  */
 248                 inet->inet_sport = htons(inet->inet_num);
 249                 err = sk->sk_prot->hash(sk);
 250                 if (err) {
 251                         sk_common_release(sk);
 252                         goto out;
 253                 }
 254         }
 255         if (sk->sk_prot->init) {
 256                 err = sk->sk_prot->init(sk);
 257                 if (err) {
 258                         sk_common_release(sk);
 259                         goto out;
 260                 }
 261         }
 262
 263         if (!kern) {
 264                 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
 265                 if (err) {
 266                         sk_common_release(sk);
 267                         goto out;
 268                 }
 269         }
 270 out:
 271         return err;
 272 out_rcu_unlock:
 273         rcu_read_unlock();
 274         goto out;
 275 }
 276
 277 static int __inet6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
 278                         bool force_bind_address_no_port, bool with_lock)
 279 {
 280         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
 281         struct inet_sock *inet = inet_sk(sk);
 282         struct ipv6_pinfo *np = inet6_sk(sk);
 283         struct net *net = sock_net(sk);
 284         __be32 v4addr = 0;
 285         unsigned short snum;
 286         bool saved_ipv6only;
 287         int addr_type = 0;
 288         int err = 0;
 289
 290         if (addr->sin6_family != AF_INET6)
 291                 return -EAFNOSUPPORT;
 292
 293         addr_type = ipv6_addr_type(&addr->sin6_addr);
 294         if ((addr_type & IPV6_ADDR_MULTICAST) && sk->sk_type == SOCK_STREAM)
 295                 return -EINVAL;
 296
 297         snum = ntohs(addr->sin6_port);
 298         if (snum && snum < inet_prot_sock(net) &&
 299             !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
 300                 return -EACCES;
 301
 302         if (with_lock)
 303                 lock_sock(sk);
 304
 305         /* Check these errors (active socket, double bind). */
 306         if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
 307                 err = -EINVAL;
 308                 goto out;
 309         }
 310
 311         /* Check if the address belongs to the host. */
 312         if (addr_type == IPV6_ADDR_MAPPED) {
 313                 struct net_device *dev = NULL;
 314                 int chk_addr_ret;
 315
 316                 /* Binding to v4-mapped address on a v6-only socket
 317                  * makes no sense
 318                  */
 319                 if (sk->sk_ipv6only) {
 320                         err = -EINVAL;
 321                         goto out;
 322                 }
 323
 324                 rcu_read_lock();
 325                 if (sk->sk_bound_dev_if) {
 326                         dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
 327                         if (!dev) {
 328                                 err = -ENODEV;
 329                                 goto out_unlock;
 330                         }
 331                 }
 332
 333                 /* Reproduce AF_INET checks to make the bindings consistent */
 334                 v4addr = addr->sin6_addr.s6_addr32[3];
 335                 chk_addr_ret = inet_addr_type_dev_table(net, dev, v4addr);
 336                 rcu_read_unlock();
 337
 338                 if (!inet_can_nonlocal_bind(net, inet) &&
 339                     v4addr != htonl(INADDR_ANY) &&
 340                     chk_addr_ret != RTN_LOCAL &&
 341                     chk_addr_ret != RTN_MULTICAST &&
 342                     chk_addr_ret != RTN_BROADCAST) {
 343                         err = -EADDRNOTAVAIL;
 344                         goto out;
 345                 }
 346         } else {
 347                 if (addr_type != IPV6_ADDR_ANY) {
 348                         struct net_device *dev = NULL;
 349
 350                         rcu_read_lock();
 351                         if (__ipv6_addr_needs_scope_id(addr_type)) {
 352                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 353                                     addr->sin6_scope_id) {
 354                                         /* Override any existing binding, if another one
 355                                          * is supplied by user.
 356                                          */
 357                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
 358                                 }
 359
 360                                 /* Binding to link-local address requires an interface */
 361                                 if (!sk->sk_bound_dev_if) {
 362                                         err = -EINVAL;
 363                                         goto out_unlock;
 364                                 }
 365                         }
 366
 367                         if (sk->sk_bound_dev_if) {
 368                                 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
 369                                 if (!dev) {
 370                                         err = -ENODEV;
 371                                         goto out_unlock;
 372                                 }
 373                         }
 374
 375                         /* ipv4 addr of the socket is invalid.  Only the
 376                          * unspecified and mapped address have a v4 equivalent.
 377                          */
 378                         v4addr = LOOPBACK4_IPV6;
 379                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
 380                                 if (!ipv6_can_nonlocal_bind(net, inet) &&
 381                                     !ipv6_chk_addr(net, &addr->sin6_addr,
 382                                                    dev, 0)) {
 383                                         err = -EADDRNOTAVAIL;
 384                                         goto out_unlock;
 385                                 }
 386                         }
 387                         rcu_read_unlock();
 388                 }
 389         }
 390
 391         inet->inet_rcv_saddr = v4addr;
 392         inet->inet_saddr = v4addr;
 393
 394         sk->sk_v6_rcv_saddr = addr->sin6_addr;
 395
 396         if (!(addr_type & IPV6_ADDR_MULTICAST))
 397                 np->saddr = addr->sin6_addr;
 398
 399         saved_ipv6only = sk->sk_ipv6only;
 400         if (addr_type != IPV6_ADDR_ANY && addr_type != IPV6_ADDR_MAPPED)
 401                 sk->sk_ipv6only = 1;
 402
 403         /* Make sure we are allowed to bind here. */
 404         if (snum || !(inet->bind_address_no_port ||
 405                       force_bind_address_no_port)) {
 406                 if (sk->sk_prot->get_port(sk, snum)) {
 407                         sk->sk_ipv6only = saved_ipv6only;
 408                         inet_reset_saddr(sk);
 409                         err = -EADDRINUSE;
 410                         goto out;
 411                 }
 412                 err = BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk);
 413                 if (err) {
 414                         sk->sk_ipv6only = saved_ipv6only;
 415                         inet_reset_saddr(sk);
 416                         goto out;
 417                 }
 418         }
 419
 420         if (addr_type != IPV6_ADDR_ANY)
 421                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
 422         if (snum)
 423                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
 424         inet->inet_sport = htons(inet->inet_num);
 425         inet->inet_dport = 0;
 426         inet->inet_daddr = 0;
 427 out:
 428         if (with_lock)
 429                 release_sock(sk);
 430         return err;
 431 out_unlock:
 432         rcu_read_unlock();
 433         goto out;
 434 }
 435
 436 /* bind for INET6 API */
 437 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 438 {
 439         struct sock *sk = sock->sk;
 440         int err = 0;
 441
 442         /* If the socket has its own bind function then use it. */
 443         if (sk->sk_prot->bind)
 444                 return sk->sk_prot->bind(sk, uaddr, addr_len);
 445
 446         if (addr_len < SIN6_LEN_RFC2133)
 447                 return -EINVAL;
 448
 449         /* BPF prog is run before any checks are done so that if the prog
 450          * changes context in a wrong way it will be caught.
 451          */
 452         err = BPF_CGROUP_RUN_PROG_INET6_BIND(sk, uaddr);
 453         if (err)
 454                 return err;
 455
 456         return __inet6_bind(sk, uaddr, addr_len, false, true);
 457 }
 458 EXPORT_SYMBOL(inet6_bind);
 459
 460 int inet6_release(struct socket *sock)
 461 {
 462         struct sock *sk = sock->sk;
 463
 464         if (!sk)
 465                 return -EINVAL;
 466
 467         /* Free mc lists */
 468         ipv6_sock_mc_close(sk);
 469
 470         /* Free ac lists */
 471         ipv6_sock_ac_close(sk);
 472
 473         return inet_release(sock);
 474 }
 475 EXPORT_SYMBOL(inet6_release);
 476
 477 void inet6_destroy_sock(struct sock *sk)
 478 {
 479         struct ipv6_pinfo *np = inet6_sk(sk);
 480         struct sk_buff *skb;
 481         struct ipv6_txoptions *opt;
 482
 483         /* Release rx options */
 484
 485         skb = xchg(&np->pktoptions, NULL);
 486         kfree_skb(skb);
 487
 488         skb = xchg(&np->rxpmtu, NULL);
 489         kfree_skb(skb);
 490
 491         /* Free flowlabels */
 492         fl6_free_socklist(sk);
 493
 494         /* Free tx options */
 495
 496         opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL);
 497         if (opt) {
 498                 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 499                 txopt_put(opt);
 500         }
 501 }
 502 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
 503
 504 /*
 505  *      This does both peername and sockname.
 506  */
 507
 508 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 509                  int peer)
 510 {
 511         struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
 512         struct sock *sk = sock->sk;
 513         struct inet_sock *inet = inet_sk(sk);
 514         struct ipv6_pinfo *np = inet6_sk(sk);
 515
 516         sin->sin6_family = AF_INET6;
 517         sin->sin6_flowinfo = 0;
 518         sin->sin6_scope_id = 0;
 519         if (peer) {
 520                 if (!inet->inet_dport)
 521                         return -ENOTCONN;
 522                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
 523                     peer == 1)
 524                         return -ENOTCONN;
 525                 sin->sin6_port = inet->inet_dport;
 526                 sin->sin6_addr = sk->sk_v6_daddr;
 527                 if (np->sndflow)
 528                         sin->sin6_flowinfo = np->flow_label;
 529         } else {
 530                 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
 531                         sin->sin6_addr = np->saddr;
 532                 else
 533                         sin->sin6_addr = sk->sk_v6_rcv_saddr;
 534
 535                 sin->sin6_port = inet->inet_sport;
 536         }
 537         sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
 538                                                  sk->sk_bound_dev_if);
 539         return sizeof(*sin);
 540 }
 541 EXPORT_SYMBOL(inet6_getname);
 542
 543 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 544 {
 545         struct sock *sk = sock->sk;
 546         struct net *net = sock_net(sk);
 547
 548         switch (cmd) {
 549         case SIOCGSTAMP:
 550                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
 551
 552         case SIOCGSTAMPNS:
 553                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
 554
 555         case SIOCADDRT:
 556         case SIOCDELRT:
 557
 558                 return ipv6_route_ioctl(net, cmd, (void __user *)arg);
 559
 560         case SIOCSIFADDR:
 561                 return addrconf_add_ifaddr(net, (void __user *) arg);
 562         case SIOCDIFADDR:
 563                 return addrconf_del_ifaddr(net, (void __user *) arg);
 564         case SIOCSIFDSTADDR:
 565                 return addrconf_set_dstaddr(net, (void __user *) arg);
 566         default:
 567                 if (!sk->sk_prot->ioctl)
 568                         return -ENOIOCTLCMD;
 569                 return sk->sk_prot->ioctl(sk, cmd, arg);
 570         }
 571         /*NOTREACHED*/
 572         return 0;
 573 }
 574 EXPORT_SYMBOL(inet6_ioctl);
 575
 576 const struct proto_ops inet6_stream_ops = {
 577         .family            = PF_INET6,
 578         .owner             = THIS_MODULE,
 579         .release           = inet6_release,
 580         .bind              = inet6_bind,
 581         .connect           = inet_stream_connect,       /* ok           */
 582         .socketpair        = sock_no_socketpair,        /* a do nothing */
 583         .accept            = inet_accept,               /* ok           */
 584         .getname           = inet6_getname,
 585         .poll              = tcp_poll,                  /* ok           */
 586         .ioctl             = inet6_ioctl,               /* must change  */
 587         .listen            = inet_listen,               /* ok           */
 588         .shutdown          = inet_shutdown,             /* ok           */
 589         .setsockopt        = sock_common_setsockopt,    /* ok           */
 590         .getsockopt        = sock_common_getsockopt,    /* ok           */
 591         .sendmsg           = inet_sendmsg,              /* ok           */
 592         .recvmsg           = inet_recvmsg,              /* ok           */
 593 #ifdef CONFIG_MMU
 594         .mmap              = tcp_mmap,
 595 #endif
 596         .sendpage          = inet_sendpage,
 597         .sendmsg_locked    = tcp_sendmsg_locked,
 598         .sendpage_locked   = tcp_sendpage_locked,
 599         .splice_read       = tcp_splice_read,
 600         .read_sock         = tcp_read_sock,
 601         .peek_len          = tcp_peek_len,
 602 #ifdef CONFIG_COMPAT
 603         .compat_setsockopt = compat_sock_common_setsockopt,
 604         .compat_getsockopt = compat_sock_common_getsockopt,
 605 #endif
 606         .set_rcvlowat      = tcp_set_rcvlowat,
 607 };
 608
 609 const struct proto_ops inet6_dgram_ops = {
 610         .family            = PF_INET6,
 611         .owner             = THIS_MODULE,
 612         .release           = inet6_release,
 613         .bind              = inet6_bind,
 614         .connect           = inet_dgram_connect,        /* ok           */
 615         .socketpair        = sock_no_socketpair,        /* a do nothing */
 616         .accept            = sock_no_accept,            /* a do nothing */
 617         .getname           = inet6_getname,
 618         .poll              = udp_poll,                  /* ok           */
 619         .ioctl             = inet6_ioctl,               /* must change  */
 620         .listen            = sock_no_listen,            /* ok           */
 621         .shutdown          = inet_shutdown,             /* ok           */
 622         .setsockopt        = sock_common_setsockopt,    /* ok           */
 623         .getsockopt        = sock_common_getsockopt,    /* ok           */
 624         .sendmsg           = inet_sendmsg,              /* ok           */
 625         .recvmsg           = inet_recvmsg,              /* ok           */
 626         .mmap              = sock_no_mmap,
 627         .sendpage          = sock_no_sendpage,
 628         .set_peek_off      = sk_set_peek_off,
 629 #ifdef CONFIG_COMPAT
 630         .compat_setsockopt = compat_sock_common_setsockopt,
 631         .compat_getsockopt = compat_sock_common_getsockopt,
 632 #endif
 633 };
 634
 635 static const struct net_proto_family inet6_family_ops = {
 636         .family = PF_INET6,
 637         .create = inet6_create,
 638         .owner  = THIS_MODULE,
 639 };
 640
 641 int inet6_register_protosw(struct inet_protosw *p)
 642 {
 643         struct list_head *lh;
 644         struct inet_protosw *answer;
 645         struct list_head *last_perm;
 646         int protocol = p->protocol;
 647         int ret;
 648
 649         spin_lock_bh(&inetsw6_lock);
 650
 651         ret = -EINVAL;
 652         if (p->type >= SOCK_MAX)
 653                 goto out_illegal;
 654
 655         /* If we are trying to override a permanent protocol, bail. */
 656         answer = NULL;
 657         ret = -EPERM;
 658         last_perm = &inetsw6[p->type];
 659         list_for_each(lh, &inetsw6[p->type]) {
 660                 answer = list_entry(lh, struct inet_protosw, list);
 661
 662                 /* Check only the non-wild match. */
 663                 if (INET_PROTOSW_PERMANENT & answer->flags) {
 664                         if (protocol == answer->protocol)
 665                                 break;
 666                         last_perm = lh;
 667                 }
 668
 669                 answer = NULL;
 670         }
 671         if (answer)
 672                 goto out_permanent;
 673
 674         /* Add the new entry after the last permanent entry if any, so that
 675          * the new entry does not override a permanent entry when matched with
 676          * a wild-card protocol. But it is allowed to override any existing
 677          * non-permanent entry.  This means that when we remove this entry, the
 678          * system automatically returns to the old behavior.
 679          */
 680         list_add_rcu(&p->list, last_perm);
 681         ret = 0;
 682 out:
 683         spin_unlock_bh(&inetsw6_lock);
 684         return ret;
 685
 686 out_permanent:
 687         pr_err("Attempt to override permanent protocol %d\n", protocol);
 688         goto out;
 689
 690 out_illegal:
 691         pr_err("Ignoring attempt to register invalid socket type %d\n",
 692                p->type);
 693         goto out;
 694 }
 695 EXPORT_SYMBOL(inet6_register_protosw);
 696
 697 void
 698 inet6_unregister_protosw(struct inet_protosw *p)
 699 {
 700         if (INET_PROTOSW_PERMANENT & p->flags) {
 701                 pr_err("Attempt to unregister permanent protocol %d\n",
 702                        p->protocol);
 703         } else {
 704                 spin_lock_bh(&inetsw6_lock);
 705                 list_del_rcu(&p->list);
 706                 spin_unlock_bh(&inetsw6_lock);
 707
 708                 synchronize_net();
 709         }
 710 }
 711 EXPORT_SYMBOL(inet6_unregister_protosw);
 712
 713 int inet6_sk_rebuild_header(struct sock *sk)
 714 {
 715         struct ipv6_pinfo *np = inet6_sk(sk);
 716         struct dst_entry *dst;
 717
 718         dst = __sk_dst_check(sk, np->dst_cookie);
 719
 720         if (!dst) {
 721                 struct inet_sock *inet = inet_sk(sk);
 722                 struct in6_addr *final_p, final;
 723                 struct flowi6 fl6;
 724
 725                 memset(&fl6, 0, sizeof(fl6));
 726                 fl6.flowi6_proto = sk->sk_protocol;
 727                 fl6.daddr = sk->sk_v6_daddr;
 728                 fl6.saddr = np->saddr;
 729                 fl6.flowlabel = np->flow_label;
 730                 fl6.flowi6_oif = sk->sk_bound_dev_if;
 731                 fl6.flowi6_mark = sk->sk_mark;
 732                 fl6.fl6_dport = inet->inet_dport;
 733                 fl6.fl6_sport = inet->inet_sport;
 734                 fl6.flowi6_uid = sk->sk_uid;
 735                 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
 736
 737                 rcu_read_lock();
 738                 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt),
 739                                          &final);
 740                 rcu_read_unlock();
 741
 742                 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
 743                 if (IS_ERR(dst)) {
 744                         sk->sk_route_caps = 0;
 745                         sk->sk_err_soft = -PTR_ERR(dst);
 746                         return PTR_ERR(dst);
 747                 }
 748
 749                 ip6_dst_store(sk, dst, NULL, NULL);
 750         }
 751
 752         return 0;
 753 }
 754 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
 755
 756 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
 757                        const struct inet6_skb_parm *opt)
 758 {
 759         const struct ipv6_pinfo *np = inet6_sk(sk);
 760
 761         if (np->rxopt.all) {
 762                 if (((opt->flags & IP6SKB_HOPBYHOP) &&
 763                      (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) ||
 764                     (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) &&
 765                      np->rxopt.bits.rxflow) ||
 766                     (opt->srcrt && (np->rxopt.bits.srcrt ||
 767                      np->rxopt.bits.osrcrt)) ||
 768                     ((opt->dst1 || opt->dst0) &&
 769                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
 770                         return true;
 771         }
 772         return false;
 773 }
 774 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
 775
 776 static struct packet_type ipv6_packet_type __read_mostly = {
 777         .type = cpu_to_be16(ETH_P_IPV6),
 778         .func = ipv6_rcv,
 779         .list_func = ipv6_list_rcv,
 780 };
 781
 782 static int __init ipv6_packet_init(void)
 783 {
 784         dev_add_pack(&ipv6_packet_type);
 785         return 0;
 786 }
 787
 788 static void ipv6_packet_cleanup(void)
 789 {
 790         dev_remove_pack(&ipv6_packet_type);
 791 }
 792
 793 static int __net_init ipv6_init_mibs(struct net *net)
 794 {
 795         int i;
 796
 797         net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib);
 798         if (!net->mib.udp_stats_in6)
 799                 return -ENOMEM;
 800         net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib);
 801         if (!net->mib.udplite_stats_in6)
 802                 goto err_udplite_mib;
 803         net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib);
 804         if (!net->mib.ipv6_statistics)
 805                 goto err_ip_mib;
 806
 807         for_each_possible_cpu(i) {
 808                 struct ipstats_mib *af_inet6_stats;
 809                 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i);
 810                 u64_stats_init(&af_inet6_stats->syncp);
 811         }
 812
 813
 814         net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib);
 815         if (!net->mib.icmpv6_statistics)
 816                 goto err_icmp_mib;
 817         net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
 818                                                 GFP_KERNEL);
 819         if (!net->mib.icmpv6msg_statistics)
 820                 goto err_icmpmsg_mib;
 821         return 0;
 822
 823 err_icmpmsg_mib:
 824         free_percpu(net->mib.icmpv6_statistics);
 825 err_icmp_mib:
 826         free_percpu(net->mib.ipv6_statistics);
 827 err_ip_mib:
 828         free_percpu(net->mib.udplite_stats_in6);
 829 err_udplite_mib:
 830         free_percpu(net->mib.udp_stats_in6);
 831         return -ENOMEM;
 832 }
 833
 834 static void ipv6_cleanup_mibs(struct net *net)
 835 {
 836         free_percpu(net->mib.udp_stats_in6);
 837         free_percpu(net->mib.udplite_stats_in6);
 838         free_percpu(net->mib.ipv6_statistics);
 839         free_percpu(net->mib.icmpv6_statistics);
 840         kfree(net->mib.icmpv6msg_statistics);
 841 }
 842
 843 static int __net_init inet6_net_init(struct net *net)
 844 {
 845         int err = 0;
 846
 847         net->ipv6.sysctl.bindv6only = 0;
 848         net->ipv6.sysctl.icmpv6_time = 1*HZ;
 849         net->ipv6.sysctl.icmpv6_echo_ignore_all = 0;
 850         net->ipv6.sysctl.flowlabel_consistency = 1;
 851         net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS;
 852         net->ipv6.sysctl.idgen_retries = 3;
 853         net->ipv6.sysctl.idgen_delay = 1 * HZ;
 854         net->ipv6.sysctl.flowlabel_state_ranges = 0;
 855         net->ipv6.sysctl.max_dst_opts_cnt = IP6_DEFAULT_MAX_DST_OPTS_CNT;
 856         net->ipv6.sysctl.max_hbh_opts_cnt = IP6_DEFAULT_MAX_HBH_OPTS_CNT;
 857         net->ipv6.sysctl.max_dst_opts_len = IP6_DEFAULT_MAX_DST_OPTS_LEN;
 858         net->ipv6.sysctl.max_hbh_opts_len = IP6_DEFAULT_MAX_HBH_OPTS_LEN;
 859         atomic_set(&net->ipv6.fib6_sernum, 1);
 860
 861         err = ipv6_init_mibs(net);
 862         if (err)
 863                 return err;
 864 #ifdef CONFIG_PROC_FS
 865         err = udp6_proc_init(net);
 866         if (err)
 867                 goto out;
 868         err = tcp6_proc_init(net);
 869         if (err)
 870                 goto proc_tcp6_fail;
 871         err = ac6_proc_init(net);
 872         if (err)
 873                 goto proc_ac6_fail;
 874 #endif
 875         return err;
 876
 877 #ifdef CONFIG_PROC_FS
 878 proc_ac6_fail:
 879         tcp6_proc_exit(net);
 880 proc_tcp6_fail:
 881         udp6_proc_exit(net);
 882 out:
 883         ipv6_cleanup_mibs(net);
 884         return err;
 885 #endif
 886 }
 887
 888 static void __net_exit inet6_net_exit(struct net *net)
 889 {
 890 #ifdef CONFIG_PROC_FS
 891         udp6_proc_exit(net);
 892         tcp6_proc_exit(net);
 893         ac6_proc_exit(net);
 894 #endif
 895         ipv6_cleanup_mibs(net);
 896 }
 897
 898 static struct pernet_operations inet6_net_ops = {
 899         .init = inet6_net_init,
 900         .exit = inet6_net_exit,
 901 };
 902
 903 static const struct ipv6_stub ipv6_stub_impl = {
 904         .ipv6_sock_mc_join = ipv6_sock_mc_join,
 905         .ipv6_sock_mc_drop = ipv6_sock_mc_drop,
 906         .ipv6_dst_lookup   = ip6_dst_lookup,
 907         .fib6_get_table    = fib6_get_table,
 908         .fib6_table_lookup = fib6_table_lookup,
 909         .fib6_lookup       = fib6_lookup,
 910         .fib6_multipath_select = fib6_multipath_select,
 911         .ip6_mtu_from_fib6 = ip6_mtu_from_fib6,
 912         .udpv6_encap_enable = udpv6_encap_enable,
 913         .ndisc_send_na = ndisc_send_na,
 914         .nd_tbl = &nd_tbl,
 915 };
 916
 917 static const struct ipv6_bpf_stub ipv6_bpf_stub_impl = {
 918         .inet6_bind = __inet6_bind,
 919         .udp6_lib_lookup = __udp6_lib_lookup,
 920 };
 921
 922 static int __init inet6_init(void)
 923 {
 924         struct list_head *r;
 925         int err = 0;
 926
 927         sock_skb_cb_check_size(sizeof(struct inet6_skb_parm));
 928
 929         /* Register the socket-side information for inet6_create.  */
 930         for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
 931                 INIT_LIST_HEAD(r);
 932
 933         if (disable_ipv6_mod) {
 934                 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
 935                 goto out;
 936         }
 937
 938         err = proto_register(&tcpv6_prot, 1);
 939         if (err)
 940                 goto out;
 941
 942         err = proto_register(&udpv6_prot, 1);
 943         if (err)
 944                 goto out_unregister_tcp_proto;
 945
 946         err = proto_register(&udplitev6_prot, 1);
 947         if (err)
 948                 goto out_unregister_udp_proto;
 949
 950         err = proto_register(&rawv6_prot, 1);
 951         if (err)
 952                 goto out_unregister_udplite_proto;
 953
 954         err = proto_register(&pingv6_prot, 1);
 955         if (err)
 956                 goto out_unregister_raw_proto;
 957
 958         /* We MUST register RAW sockets before we create the ICMP6,
 959          * IGMP6, or NDISC control sockets.
 960          */
 961         err = rawv6_init();
 962         if (err)
 963                 goto out_unregister_ping_proto;
 964
 965         /* Register the family here so that the init calls below will
 966          * be able to create sockets. (?? is this dangerous ??)
 967          */
 968         err = sock_register(&inet6_family_ops);
 969         if (err)
 970                 goto out_sock_register_fail;
 971
 972         /*
 973          *      ipngwg API draft makes clear that the correct semantics
 974          *      for TCP and UDP is to consider one TCP and UDP instance
 975          *      in a host available by both INET and INET6 APIs and
 976          *      able to communicate via both network protocols.
 977          */
 978
 979         err = register_pernet_subsys(&inet6_net_ops);
 980         if (err)
 981                 goto register_pernet_fail;
 982         err = ip6_mr_init();
 983         if (err)
 984                 goto ipmr_fail;
 985         err = icmpv6_init();
 986         if (err)
 987                 goto icmp_fail;
 988         err = ndisc_init();
 989         if (err)
 990                 goto ndisc_fail;
 991         err = igmp6_init();
 992         if (err)
 993                 goto igmp_fail;
 994
 995         err = ipv6_netfilter_init();
 996         if (err)
 997                 goto netfilter_fail;
 998         /* Create /proc/foo6 entries. */
 999 #ifdef CONFIG_PROC_FS
1000         err = -ENOMEM;
1001         if (raw6_proc_init())
1002                 goto proc_raw6_fail;
1003         if (udplite6_proc_init())
1004                 goto proc_udplite6_fail;
1005         if (ipv6_misc_proc_init())
1006                 goto proc_misc6_fail;
1007         if (if6_proc_init())
1008                 goto proc_if6_fail;
1009 #endif
1010         err = ip6_route_init();
1011         if (err)
1012                 goto ip6_route_fail;
1013         err = ndisc_late_init();
1014         if (err)
1015                 goto ndisc_late_fail;
1016         err = ip6_flowlabel_init();
1017         if (err)
1018                 goto ip6_flowlabel_fail;
1019         err = ipv6_anycast_init();
1020         if (err)
1021                 goto ipv6_anycast_fail;
1022         err = addrconf_init();
1023         if (err)
1024                 goto addrconf_fail;
1025
1026         /* Init v6 extension headers. */
1027         err = ipv6_exthdrs_init();
1028         if (err)
1029                 goto ipv6_exthdrs_fail;
1030
1031         err = ipv6_frag_init();
1032         if (err)
1033                 goto ipv6_frag_fail;
1034
1035         /* Init v6 transport protocols. */
1036         err = udpv6_init();
1037         if (err)
1038                 goto udpv6_fail;
1039
1040         err = udplitev6_init();
1041         if (err)
1042                 goto udplitev6_fail;
1043
1044         err = udpv6_offload_init();
1045         if (err)
1046                 goto udpv6_offload_fail;
1047
1048         err = tcpv6_init();
1049         if (err)
1050                 goto tcpv6_fail;
1051
1052         err = ipv6_packet_init();
1053         if (err)
1054                 goto ipv6_packet_fail;
1055
1056         err = pingv6_init();
1057         if (err)
1058                 goto pingv6_fail;
1059
1060         err = calipso_init();
1061         if (err)
1062                 goto calipso_fail;
1063
1064         err = seg6_init();
1065         if (err)
1066                 goto seg6_fail;
1067
1068         err = igmp6_late_init();
1069         if (err)
1070                 goto igmp6_late_err;
1071
1072 #ifdef CONFIG_SYSCTL
1073         err = ipv6_sysctl_register();
1074         if (err)
1075                 goto sysctl_fail;
1076 #endif
1077
1078         /* ensure that ipv6 stubs are visible only after ipv6 is ready */
1079         wmb();
1080         ipv6_stub = &ipv6_stub_impl;
1081         ipv6_bpf_stub = &ipv6_bpf_stub_impl;
1082 out:
1083         return err;
1084
1085 #ifdef CONFIG_SYSCTL
1086 sysctl_fail:
1087         igmp6_late_cleanup();
1088 #endif
1089 igmp6_late_err:
1090         seg6_exit();
1091 seg6_fail:
1092         calipso_exit();
1093 calipso_fail:
1094         pingv6_exit();
1095 pingv6_fail:
1096         ipv6_packet_cleanup();
1097 ipv6_packet_fail:
1098         tcpv6_exit();
1099 tcpv6_fail:
1100         udpv6_offload_exit();
1101 udpv6_offload_fail:
1102         udplitev6_exit();
1103 udplitev6_fail:
1104         udpv6_exit();
1105 udpv6_fail:
1106         ipv6_frag_exit();
1107 ipv6_frag_fail:
1108         ipv6_exthdrs_exit();
1109 ipv6_exthdrs_fail:
1110         addrconf_cleanup();
1111 addrconf_fail:
1112         ipv6_anycast_cleanup();
1113 ipv6_anycast_fail:
1114         ip6_flowlabel_cleanup();
1115 ip6_flowlabel_fail:
1116         ndisc_late_cleanup();
1117 ndisc_late_fail:
1118         ip6_route_cleanup();
1119 ip6_route_fail:
1120 #ifdef CONFIG_PROC_FS
1121         if6_proc_exit();
1122 proc_if6_fail:
1123         ipv6_misc_proc_exit();
1124 proc_misc6_fail:
1125         udplite6_proc_exit();
1126 proc_udplite6_fail:
1127         raw6_proc_exit();
1128 proc_raw6_fail:
1129 #endif
1130         ipv6_netfilter_fini();
1131 netfilter_fail:
1132         igmp6_cleanup();
1133 igmp_fail:
1134         ndisc_cleanup();
1135 ndisc_fail:
1136         icmpv6_cleanup();
1137 icmp_fail:
1138         ip6_mr_cleanup();
1139 ipmr_fail:
1140         unregister_pernet_subsys(&inet6_net_ops);
1141 register_pernet_fail:
1142         sock_unregister(PF_INET6);
1143         rtnl_unregister_all(PF_INET6);
1144 out_sock_register_fail:
1145         rawv6_exit();
1146 out_unregister_ping_proto:
1147         proto_unregister(&pingv6_prot);
1148 out_unregister_raw_proto:
1149         proto_unregister(&rawv6_prot);
1150 out_unregister_udplite_proto:
1151         proto_unregister(&udplitev6_prot);
1152 out_unregister_udp_proto:
1153         proto_unregister(&udpv6_prot);
1154 out_unregister_tcp_proto:
1155         proto_unregister(&tcpv6_prot);
1156         goto out;
1157 }
1158 module_init(inet6_init);
1159
1160 MODULE_ALIAS_NETPROTO(PF_INET6);