net/ipv6/af_inet6.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *      PF_INET6 socket protocol family
   4  *      Linux INET6 implementation
   5  *
   6  *      Authors:
   7  *      Pedro Roque             <roque@di.fc.ul.pt>
   8  *
   9  *      Adapted from linux/net/ipv4/af_inet.c
  10  *
  11  *      Fixes:
  12  *      piggy, Karl Knutson     :       Socket protocol table
  13  *      Hideaki YOSHIFUJI       :       sin6_scope_id support
  14  *      Arnaldo Melo            :       check proc_net_create return, cleanups
  15  */
  16
  17 #define pr_fmt(fmt) "IPv6: " fmt
  18
  19 #include <linux/module.h>
  20 #include <linux/capability.h>
  21 #include <linux/errno.h>
  22 #include <linux/types.h>
  23 #include <linux/socket.h>
  24 #include <linux/in.h>
  25 #include <linux/kernel.h>
  26 #include <linux/timer.h>
  27 #include <linux/string.h>
  28 #include <linux/sockios.h>
  29 #include <linux/net.h>
  30 #include <linux/fcntl.h>
  31 #include <linux/mm.h>
  32 #include <linux/interrupt.h>
  33 #include <linux/proc_fs.h>
  34 #include <linux/stat.h>
  35 #include <linux/init.h>
  36 #include <linux/slab.h>
  37
  38 #include <linux/inet.h>
  39 #include <linux/netdevice.h>
  40 #include <linux/icmpv6.h>
  41 #include <linux/netfilter_ipv6.h>
  42
  43 #include <net/ip.h>
  44 #include <net/ipv6.h>
  45 #include <net/udp.h>
  46 #include <net/udplite.h>
  47 #include <net/tcp.h>
  48 #include <net/ping.h>
  49 #include <net/protocol.h>
  50 #include <net/inet_common.h>
  51 #include <net/route.h>
  52 #include <net/transp_v6.h>
  53 #include <net/ip6_route.h>
  54 #include <net/addrconf.h>
  55 #include <net/ipv6_stubs.h>
  56 #include <net/ndisc.h>
  57 #ifdef CONFIG_IPV6_TUNNEL
  58 #include <net/ip6_tunnel.h>
  59 #endif
  60 #include <net/calipso.h>
  61 #include <net/seg6.h>
  62 #include <net/rpl.h>
  63 #include <net/compat.h>
  64 #include <net/xfrm.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 & FLOWLABEL_REFLECT_ESTABLISHED;
 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                         u32 flags)
 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 (!(flags & BIND_NO_CAP_NET_BIND_SERVICE) &&
 299             snum && inet_port_requires_bind_service(net, snum) &&
 300             !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
 301                 return -EACCES;
 302
 303         if (flags & BIND_WITH_LOCK)
 304                 lock_sock(sk);
 305
 306         /* Check these errors (active socket, double bind). */
 307         if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
 308                 err = -EINVAL;
 309                 goto out;
 310         }
 311
 312         /* Check if the address belongs to the host. */
 313         if (addr_type == IPV6_ADDR_MAPPED) {
 314                 struct net_device *dev = NULL;
 315                 int chk_addr_ret;
 316
 317                 /* Binding to v4-mapped address on a v6-only socket
 318                  * makes no sense
 319                  */
 320                 if (sk->sk_ipv6only) {
 321                         err = -EINVAL;
 322                         goto out;
 323                 }
 324
 325                 rcu_read_lock();
 326                 if (sk->sk_bound_dev_if) {
 327                         dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
 328                         if (!dev) {
 329                                 err = -ENODEV;
 330                                 goto out_unlock;
 331                         }
 332                 }
 333
 334                 /* Reproduce AF_INET checks to make the bindings consistent */
 335                 v4addr = addr->sin6_addr.s6_addr32[3];
 336                 chk_addr_ret = inet_addr_type_dev_table(net, dev, v4addr);
 337                 rcu_read_unlock();
 338
 339                 if (!inet_can_nonlocal_bind(net, inet) &&
 340                     v4addr != htonl(INADDR_ANY) &&
 341                     chk_addr_ret != RTN_LOCAL &&
 342                     chk_addr_ret != RTN_MULTICAST &&
 343                     chk_addr_ret != RTN_BROADCAST) {
 344                         err = -EADDRNOTAVAIL;
 345                         goto out;
 346                 }
 347         } else {
 348                 if (addr_type != IPV6_ADDR_ANY) {
 349                         struct net_device *dev = NULL;
 350
 351                         rcu_read_lock();
 352                         if (__ipv6_addr_needs_scope_id(addr_type)) {
 353                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 354                                     addr->sin6_scope_id) {
 355                                         /* Override any existing binding, if another one
 356                                          * is supplied by user.
 357                                          */
 358                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
 359                                 }
 360
 361                                 /* Binding to link-local address requires an interface */
 362                                 if (!sk->sk_bound_dev_if) {
 363                                         err = -EINVAL;
 364                                         goto out_unlock;
 365                                 }
 366                         }
 367
 368                         if (sk->sk_bound_dev_if) {
 369                                 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
 370                                 if (!dev) {
 371                                         err = -ENODEV;
 372                                         goto out_unlock;
 373                                 }
 374                         }
 375
 376                         /* ipv4 addr of the socket is invalid.  Only the
 377                          * unspecified and mapped address have a v4 equivalent.
 378                          */
 379                         v4addr = LOOPBACK4_IPV6;
 380                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
 381                                 if (!ipv6_can_nonlocal_bind(net, inet) &&
 382                                     !ipv6_chk_addr(net, &addr->sin6_addr,
 383                                                    dev, 0)) {
 384                                         err = -EADDRNOTAVAIL;
 385                                         goto out_unlock;
 386                                 }
 387                         }
 388                         rcu_read_unlock();
 389                 }
 390         }
 391
 392         inet->inet_rcv_saddr = v4addr;
 393         inet->inet_saddr = v4addr;
 394
 395         sk->sk_v6_rcv_saddr = addr->sin6_addr;
 396
 397         if (!(addr_type & IPV6_ADDR_MULTICAST))
 398                 np->saddr = addr->sin6_addr;
 399
 400         saved_ipv6only = sk->sk_ipv6only;
 401         if (addr_type != IPV6_ADDR_ANY && addr_type != IPV6_ADDR_MAPPED)
 402                 sk->sk_ipv6only = 1;
 403
 404         /* Make sure we are allowed to bind here. */
 405         if (snum || !(inet->bind_address_no_port ||
 406                       (flags & BIND_FORCE_ADDRESS_NO_PORT))) {
 407                 if (sk->sk_prot->get_port(sk, snum)) {
 408                         sk->sk_ipv6only = saved_ipv6only;
 409                         inet_reset_saddr(sk);
 410                         err = -EADDRINUSE;
 411                         goto out;
 412                 }
 413                 if (!(flags & BIND_FROM_BPF)) {
 414                         err = BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk);
 415                         if (err) {
 416                                 sk->sk_ipv6only = saved_ipv6only;
 417                                 inet_reset_saddr(sk);
 418                                 goto out;
 419                         }
 420                 }
 421         }
 422
 423         if (addr_type != IPV6_ADDR_ANY)
 424                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
 425         if (snum)
 426                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
 427         inet->inet_sport = htons(inet->inet_num);
 428         inet->inet_dport = 0;
 429         inet->inet_daddr = 0;
 430 out:
 431         if (flags & BIND_WITH_LOCK)
 432                 release_sock(sk);
 433         return err;
 434 out_unlock:
 435         rcu_read_unlock();
 436         goto out;
 437 }
 438
 439 /* bind for INET6 API */
 440 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 441 {
 442         struct sock *sk = sock->sk;
 443         u32 flags = BIND_WITH_LOCK;
 444         int err = 0;
 445
 446         /* If the socket has its own bind function then use it. */
 447         if (sk->sk_prot->bind)
 448                 return sk->sk_prot->bind(sk, uaddr, addr_len);
 449
 450         if (addr_len < SIN6_LEN_RFC2133)
 451                 return -EINVAL;
 452
 453         /* BPF prog is run before any checks are done so that if the prog
 454          * changes context in a wrong way it will be caught.
 455          */
 456         err = BPF_CGROUP_RUN_PROG_INET_BIND_LOCK(sk, uaddr,
 457                                                  BPF_CGROUP_INET6_BIND, &flags);
 458         if (err)
 459                 return err;
 460
 461         return __inet6_bind(sk, uaddr, addr_len, flags);
 462 }
 463 EXPORT_SYMBOL(inet6_bind);
 464
 465 int inet6_release(struct socket *sock)
 466 {
 467         struct sock *sk = sock->sk;
 468
 469         if (!sk)
 470                 return -EINVAL;
 471
 472         /* Free mc lists */
 473         ipv6_sock_mc_close(sk);
 474
 475         /* Free ac lists */
 476         ipv6_sock_ac_close(sk);
 477
 478         return inet_release(sock);
 479 }
 480 EXPORT_SYMBOL(inet6_release);
 481
 482 void inet6_destroy_sock(struct sock *sk)
 483 {
 484         struct ipv6_pinfo *np = inet6_sk(sk);
 485         struct sk_buff *skb;
 486         struct ipv6_txoptions *opt;
 487
 488         /* Release rx options */
 489
 490         skb = xchg(&np->pktoptions, NULL);
 491         kfree_skb(skb);
 492
 493         skb = xchg(&np->rxpmtu, NULL);
 494         kfree_skb(skb);
 495
 496         /* Free flowlabels */
 497         fl6_free_socklist(sk);
 498
 499         /* Free tx options */
 500
 501         opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL);
 502         if (opt) {
 503                 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 504                 txopt_put(opt);
 505         }
 506 }
 507 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
 508
 509 /*
 510  *      This does both peername and sockname.
 511  */
 512 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 513                   int peer)
 514 {
 515         struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
 516         struct sock *sk = sock->sk;
 517         struct inet_sock *inet = inet_sk(sk);
 518         struct ipv6_pinfo *np = inet6_sk(sk);
 519
 520         sin->sin6_family = AF_INET6;
 521         sin->sin6_flowinfo = 0;
 522         sin->sin6_scope_id = 0;
 523         if (peer) {
 524                 if (!inet->inet_dport)
 525                         return -ENOTCONN;
 526                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
 527                     peer == 1)
 528                         return -ENOTCONN;
 529                 sin->sin6_port = inet->inet_dport;
 530                 sin->sin6_addr = sk->sk_v6_daddr;
 531                 if (np->sndflow)
 532                         sin->sin6_flowinfo = np->flow_label;
 533                 BPF_CGROUP_RUN_SA_PROG_LOCK(sk, (struct sockaddr *)sin,
 534                                             BPF_CGROUP_INET6_GETPEERNAME,
 535                                             NULL);
 536         } else {
 537                 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
 538                         sin->sin6_addr = np->saddr;
 539                 else
 540                         sin->sin6_addr = sk->sk_v6_rcv_saddr;
 541                 sin->sin6_port = inet->inet_sport;
 542                 BPF_CGROUP_RUN_SA_PROG_LOCK(sk, (struct sockaddr *)sin,
 543                                             BPF_CGROUP_INET6_GETSOCKNAME,
 544                                             NULL);
 545         }
 546         sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
 547                                                  sk->sk_bound_dev_if);
 548         return sizeof(*sin);
 549 }
 550 EXPORT_SYMBOL(inet6_getname);
 551
 552 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 553 {
 554         void __user *argp = (void __user *)arg;
 555         struct sock *sk = sock->sk;
 556         struct net *net = sock_net(sk);
 557
 558         switch (cmd) {
 559         case SIOCADDRT:
 560         case SIOCDELRT: {
 561                 struct in6_rtmsg rtmsg;
 562
 563                 if (copy_from_user(&rtmsg, argp, sizeof(rtmsg)))
 564                         return -EFAULT;
 565                 return ipv6_route_ioctl(net, cmd, &rtmsg);
 566         }
 567         case SIOCSIFADDR:
 568                 return addrconf_add_ifaddr(net, argp);
 569         case SIOCDIFADDR:
 570                 return addrconf_del_ifaddr(net, argp);
 571         case SIOCSIFDSTADDR:
 572                 return addrconf_set_dstaddr(net, argp);
 573         default:
 574                 if (!sk->sk_prot->ioctl)
 575                         return -ENOIOCTLCMD;
 576                 return sk->sk_prot->ioctl(sk, cmd, arg);
 577         }
 578         /*NOTREACHED*/
 579         return 0;
 580 }
 581 EXPORT_SYMBOL(inet6_ioctl);
 582
 583 #ifdef CONFIG_COMPAT
 584 struct compat_in6_rtmsg {
 585         struct in6_addr         rtmsg_dst;
 586         struct in6_addr         rtmsg_src;
 587         struct in6_addr         rtmsg_gateway;
 588         u32                     rtmsg_type;
 589         u16                     rtmsg_dst_len;
 590         u16                     rtmsg_src_len;
 591         u32                     rtmsg_metric;
 592         u32                     rtmsg_info;
 593         u32                     rtmsg_flags;
 594         s32                     rtmsg_ifindex;
 595 };
 596
 597 static int inet6_compat_routing_ioctl(struct sock *sk, unsigned int cmd,
 598                 struct compat_in6_rtmsg __user *ur)
 599 {
 600         struct in6_rtmsg rt;
 601
 602         if (copy_from_user(&rt.rtmsg_dst, &ur->rtmsg_dst,
 603                         3 * sizeof(struct in6_addr)) ||
 604             get_user(rt.rtmsg_type, &ur->rtmsg_type) ||
 605             get_user(rt.rtmsg_dst_len, &ur->rtmsg_dst_len) ||
 606             get_user(rt.rtmsg_src_len, &ur->rtmsg_src_len) ||
 607             get_user(rt.rtmsg_metric, &ur->rtmsg_metric) ||
 608             get_user(rt.rtmsg_info, &ur->rtmsg_info) ||
 609             get_user(rt.rtmsg_flags, &ur->rtmsg_flags) ||
 610             get_user(rt.rtmsg_ifindex, &ur->rtmsg_ifindex))
 611                 return -EFAULT;
 612
 613
 614         return ipv6_route_ioctl(sock_net(sk), cmd, &rt);
 615 }
 616
 617 int inet6_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 618 {
 619         void __user *argp = compat_ptr(arg);
 620         struct sock *sk = sock->sk;
 621
 622         switch (cmd) {
 623         case SIOCADDRT:
 624         case SIOCDELRT:
 625                 return inet6_compat_routing_ioctl(sk, cmd, argp);
 626         default:
 627                 return -ENOIOCTLCMD;
 628         }
 629 }
 630 EXPORT_SYMBOL_GPL(inet6_compat_ioctl);
 631 #endif /* CONFIG_COMPAT */
 632
 633 INDIRECT_CALLABLE_DECLARE(int udpv6_sendmsg(struct sock *, struct msghdr *,
 634                                             size_t));
 635 int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
 636 {
 637         struct sock *sk = sock->sk;
 638
 639         if (unlikely(inet_send_prepare(sk)))
 640                 return -EAGAIN;
 641
 642         return INDIRECT_CALL_2(sk->sk_prot->sendmsg, tcp_sendmsg, udpv6_sendmsg,
 643                                sk, msg, size);
 644 }
 645
 646 INDIRECT_CALLABLE_DECLARE(int udpv6_recvmsg(struct sock *, struct msghdr *,
 647                                             size_t, int, int, int *));
 648 int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
 649                   int flags)
 650 {
 651         struct sock *sk = sock->sk;
 652         int addr_len = 0;
 653         int err;
 654
 655         if (likely(!(flags & MSG_ERRQUEUE)))
 656                 sock_rps_record_flow(sk);
 657
 658         err = INDIRECT_CALL_2(sk->sk_prot->recvmsg, tcp_recvmsg, udpv6_recvmsg,
 659                               sk, msg, size, flags & MSG_DONTWAIT,
 660                               flags & ~MSG_DONTWAIT, &addr_len);
 661         if (err >= 0)
 662                 msg->msg_namelen = addr_len;
 663         return err;
 664 }
 665
 666 const struct proto_ops inet6_stream_ops = {
 667         .family            = PF_INET6,
 668         .flags             = PROTO_CMSG_DATA_ONLY,
 669         .owner             = THIS_MODULE,
 670         .release           = inet6_release,
 671         .bind              = inet6_bind,
 672         .connect           = inet_stream_connect,       /* ok           */
 673         .socketpair        = sock_no_socketpair,        /* a do nothing */
 674         .accept            = inet_accept,               /* ok           */
 675         .getname           = inet6_getname,
 676         .poll              = tcp_poll,                  /* ok           */
 677         .ioctl             = inet6_ioctl,               /* must change  */
 678         .gettstamp         = sock_gettstamp,
 679         .listen            = inet_listen,               /* ok           */
 680         .shutdown          = inet_shutdown,             /* ok           */
 681         .setsockopt        = sock_common_setsockopt,    /* ok           */
 682         .getsockopt        = sock_common_getsockopt,    /* ok           */
 683         .sendmsg           = inet6_sendmsg,             /* retpoline's sake */
 684         .recvmsg           = inet6_recvmsg,             /* retpoline's sake */
 685 #ifdef CONFIG_MMU
 686         .mmap              = tcp_mmap,
 687 #endif
 688         .sendpage          = inet_sendpage,
 689         .sendmsg_locked    = tcp_sendmsg_locked,
 690         .sendpage_locked   = tcp_sendpage_locked,
 691         .splice_read       = tcp_splice_read,
 692         .read_sock         = tcp_read_sock,
 693         .peek_len          = tcp_peek_len,
 694 #ifdef CONFIG_COMPAT
 695         .compat_ioctl      = inet6_compat_ioctl,
 696 #endif
 697         .set_rcvlowat      = tcp_set_rcvlowat,
 698 };
 699
 700 const struct proto_ops inet6_dgram_ops = {
 701         .family            = PF_INET6,
 702         .owner             = THIS_MODULE,
 703         .release           = inet6_release,
 704         .bind              = inet6_bind,
 705         .connect           = inet_dgram_connect,        /* ok           */
 706         .socketpair        = sock_no_socketpair,        /* a do nothing */
 707         .accept            = sock_no_accept,            /* a do nothing */
 708         .getname           = inet6_getname,
 709         .poll              = udp_poll,                  /* ok           */
 710         .ioctl             = inet6_ioctl,               /* must change  */
 711         .gettstamp         = sock_gettstamp,
 712         .listen            = sock_no_listen,            /* ok           */
 713         .shutdown          = inet_shutdown,             /* ok           */
 714         .setsockopt        = sock_common_setsockopt,    /* ok           */
 715         .getsockopt        = sock_common_getsockopt,    /* ok           */
 716         .sendmsg           = inet6_sendmsg,             /* retpoline's sake */
 717         .recvmsg           = inet6_recvmsg,             /* retpoline's sake */
 718         .mmap              = sock_no_mmap,
 719         .sendpage          = sock_no_sendpage,
 720         .set_peek_off      = sk_set_peek_off,
 721 #ifdef CONFIG_COMPAT
 722         .compat_ioctl      = inet6_compat_ioctl,
 723 #endif
 724 };
 725
 726 static const struct net_proto_family inet6_family_ops = {
 727         .family = PF_INET6,
 728         .create = inet6_create,
 729         .owner  = THIS_MODULE,
 730 };
 731
 732 int inet6_register_protosw(struct inet_protosw *p)
 733 {
 734         struct list_head *lh;
 735         struct inet_protosw *answer;
 736         struct list_head *last_perm;
 737         int protocol = p->protocol;
 738         int ret;
 739
 740         spin_lock_bh(&inetsw6_lock);
 741
 742         ret = -EINVAL;
 743         if (p->type >= SOCK_MAX)
 744                 goto out_illegal;
 745
 746         /* If we are trying to override a permanent protocol, bail. */
 747         answer = NULL;
 748         ret = -EPERM;
 749         last_perm = &inetsw6[p->type];
 750         list_for_each(lh, &inetsw6[p->type]) {
 751                 answer = list_entry(lh, struct inet_protosw, list);
 752
 753                 /* Check only the non-wild match. */
 754                 if (INET_PROTOSW_PERMANENT & answer->flags) {
 755                         if (protocol == answer->protocol)
 756                                 break;
 757                         last_perm = lh;
 758                 }
 759
 760                 answer = NULL;
 761         }
 762         if (answer)
 763                 goto out_permanent;
 764
 765         /* Add the new entry after the last permanent entry if any, so that
 766          * the new entry does not override a permanent entry when matched with
 767          * a wild-card protocol. But it is allowed to override any existing
 768          * non-permanent entry.  This means that when we remove this entry, the
 769          * system automatically returns to the old behavior.
 770          */
 771         list_add_rcu(&p->list, last_perm);
 772         ret = 0;
 773 out:
 774         spin_unlock_bh(&inetsw6_lock);
 775         return ret;
 776
 777 out_permanent:
 778         pr_err("Attempt to override permanent protocol %d\n", protocol);
 779         goto out;
 780
 781 out_illegal:
 782         pr_err("Ignoring attempt to register invalid socket type %d\n",
 783                p->type);
 784         goto out;
 785 }
 786 EXPORT_SYMBOL(inet6_register_protosw);
 787
 788 void
 789 inet6_unregister_protosw(struct inet_protosw *p)
 790 {
 791         if (INET_PROTOSW_PERMANENT & p->flags) {
 792                 pr_err("Attempt to unregister permanent protocol %d\n",
 793                        p->protocol);
 794         } else {
 795                 spin_lock_bh(&inetsw6_lock);
 796                 list_del_rcu(&p->list);
 797                 spin_unlock_bh(&inetsw6_lock);
 798
 799                 synchronize_net();
 800         }
 801 }
 802 EXPORT_SYMBOL(inet6_unregister_protosw);
 803
 804 int inet6_sk_rebuild_header(struct sock *sk)
 805 {
 806         struct ipv6_pinfo *np = inet6_sk(sk);
 807         struct dst_entry *dst;
 808
 809         dst = __sk_dst_check(sk, np->dst_cookie);
 810
 811         if (!dst) {
 812                 struct inet_sock *inet = inet_sk(sk);
 813                 struct in6_addr *final_p, final;
 814                 struct flowi6 fl6;
 815
 816                 memset(&fl6, 0, sizeof(fl6));
 817                 fl6.flowi6_proto = sk->sk_protocol;
 818                 fl6.daddr = sk->sk_v6_daddr;
 819                 fl6.saddr = np->saddr;
 820                 fl6.flowlabel = np->flow_label;
 821                 fl6.flowi6_oif = sk->sk_bound_dev_if;
 822                 fl6.flowi6_mark = sk->sk_mark;
 823                 fl6.fl6_dport = inet->inet_dport;
 824                 fl6.fl6_sport = inet->inet_sport;
 825                 fl6.flowi6_uid = sk->sk_uid;
 826                 security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6));
 827
 828                 rcu_read_lock();
 829                 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt),
 830                                          &final);
 831                 rcu_read_unlock();
 832
 833                 dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
 834                 if (IS_ERR(dst)) {
 835                         sk->sk_route_caps = 0;
 836                         sk->sk_err_soft = -PTR_ERR(dst);
 837                         return PTR_ERR(dst);
 838                 }
 839
 840                 ip6_dst_store(sk, dst, NULL, NULL);
 841         }
 842
 843         return 0;
 844 }
 845 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
 846
 847 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
 848                        const struct inet6_skb_parm *opt)
 849 {
 850         const struct ipv6_pinfo *np = inet6_sk(sk);
 851
 852         if (np->rxopt.all) {
 853                 if (((opt->flags & IP6SKB_HOPBYHOP) &&
 854                      (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) ||
 855                     (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) &&
 856                      np->rxopt.bits.rxflow) ||
 857                     (opt->srcrt && (np->rxopt.bits.srcrt ||
 858                      np->rxopt.bits.osrcrt)) ||
 859                     ((opt->dst1 || opt->dst0) &&
 860                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
 861                         return true;
 862         }
 863         return false;
 864 }
 865 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
 866
 867 static struct packet_type ipv6_packet_type __read_mostly = {
 868         .type = cpu_to_be16(ETH_P_IPV6),
 869         .func = ipv6_rcv,
 870         .list_func = ipv6_list_rcv,
 871 };
 872
 873 static int __init ipv6_packet_init(void)
 874 {
 875         dev_add_pack(&ipv6_packet_type);
 876         return 0;
 877 }
 878
 879 static void ipv6_packet_cleanup(void)
 880 {
 881         dev_remove_pack(&ipv6_packet_type);
 882 }
 883
 884 static int __net_init ipv6_init_mibs(struct net *net)
 885 {
 886         int i;
 887
 888         net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib);
 889         if (!net->mib.udp_stats_in6)
 890                 return -ENOMEM;
 891         net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib);
 892         if (!net->mib.udplite_stats_in6)
 893                 goto err_udplite_mib;
 894         net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib);
 895         if (!net->mib.ipv6_statistics)
 896                 goto err_ip_mib;
 897
 898         for_each_possible_cpu(i) {
 899                 struct ipstats_mib *af_inet6_stats;
 900                 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i);
 901                 u64_stats_init(&af_inet6_stats->syncp);
 902         }
 903
 904
 905         net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib);
 906         if (!net->mib.icmpv6_statistics)
 907                 goto err_icmp_mib;
 908         net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
 909                                                 GFP_KERNEL);
 910         if (!net->mib.icmpv6msg_statistics)
 911                 goto err_icmpmsg_mib;
 912         return 0;
 913
 914 err_icmpmsg_mib:
 915         free_percpu(net->mib.icmpv6_statistics);
 916 err_icmp_mib:
 917         free_percpu(net->mib.ipv6_statistics);
 918 err_ip_mib:
 919         free_percpu(net->mib.udplite_stats_in6);
 920 err_udplite_mib:
 921         free_percpu(net->mib.udp_stats_in6);
 922         return -ENOMEM;
 923 }
 924
 925 static void ipv6_cleanup_mibs(struct net *net)
 926 {
 927         free_percpu(net->mib.udp_stats_in6);
 928         free_percpu(net->mib.udplite_stats_in6);
 929         free_percpu(net->mib.ipv6_statistics);
 930         free_percpu(net->mib.icmpv6_statistics);
 931         kfree(net->mib.icmpv6msg_statistics);
 932 }
 933
 934 static int __net_init inet6_net_init(struct net *net)
 935 {
 936         int err = 0;
 937
 938         net->ipv6.sysctl.bindv6only = 0;
 939         net->ipv6.sysctl.icmpv6_time = 1*HZ;
 940         net->ipv6.sysctl.icmpv6_echo_ignore_all = 0;
 941         net->ipv6.sysctl.icmpv6_echo_ignore_multicast = 0;
 942         net->ipv6.sysctl.icmpv6_echo_ignore_anycast = 0;
 943
 944         /* By default, rate limit error messages.
 945          * Except for pmtu discovery, it would break it.
 946          * proc_do_large_bitmap needs pointer to the bitmap.
 947          */
 948         bitmap_set(net->ipv6.sysctl.icmpv6_ratemask, 0, ICMPV6_ERRMSG_MAX + 1);
 949         bitmap_clear(net->ipv6.sysctl.icmpv6_ratemask, ICMPV6_PKT_TOOBIG, 1);
 950         net->ipv6.sysctl.icmpv6_ratemask_ptr = net->ipv6.sysctl.icmpv6_ratemask;
 951
 952         net->ipv6.sysctl.flowlabel_consistency = 1;
 953         net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS;
 954         net->ipv6.sysctl.idgen_retries = 3;
 955         net->ipv6.sysctl.idgen_delay = 1 * HZ;
 956         net->ipv6.sysctl.flowlabel_state_ranges = 0;
 957         net->ipv6.sysctl.max_dst_opts_cnt = IP6_DEFAULT_MAX_DST_OPTS_CNT;
 958         net->ipv6.sysctl.max_hbh_opts_cnt = IP6_DEFAULT_MAX_HBH_OPTS_CNT;
 959         net->ipv6.sysctl.max_dst_opts_len = IP6_DEFAULT_MAX_DST_OPTS_LEN;
 960         net->ipv6.sysctl.max_hbh_opts_len = IP6_DEFAULT_MAX_HBH_OPTS_LEN;
 961         net->ipv6.sysctl.fib_notify_on_flag_change = 0;
 962         atomic_set(&net->ipv6.fib6_sernum, 1);
 963
 964         err = ipv6_init_mibs(net);
 965         if (err)
 966                 return err;
 967 #ifdef CONFIG_PROC_FS
 968         err = udp6_proc_init(net);
 969         if (err)
 970                 goto out;
 971         err = tcp6_proc_init(net);
 972         if (err)
 973                 goto proc_tcp6_fail;
 974         err = ac6_proc_init(net);
 975         if (err)
 976                 goto proc_ac6_fail;
 977 #endif
 978         return err;
 979
 980 #ifdef CONFIG_PROC_FS
 981 proc_ac6_fail:
 982         tcp6_proc_exit(net);
 983 proc_tcp6_fail:
 984         udp6_proc_exit(net);
 985 out:
 986         ipv6_cleanup_mibs(net);
 987         return err;
 988 #endif
 989 }
 990
 991 static void __net_exit inet6_net_exit(struct net *net)
 992 {
 993 #ifdef CONFIG_PROC_FS
 994         udp6_proc_exit(net);
 995         tcp6_proc_exit(net);
 996         ac6_proc_exit(net);
 997 #endif
 998         ipv6_cleanup_mibs(net);
 999 }
1000
1001 static struct pernet_operations inet6_net_ops = {
1002         .init = inet6_net_init,
1003         .exit = inet6_net_exit,
1004 };
1005
1006 static int ipv6_route_input(struct sk_buff *skb)
1007 {
1008         ip6_route_input(skb);
1009         return skb_dst(skb)->error;
1010 }
1011
1012 static const struct ipv6_stub ipv6_stub_impl = {
1013         .ipv6_sock_mc_join = ipv6_sock_mc_join,
1014         .ipv6_sock_mc_drop = ipv6_sock_mc_drop,
1015         .ipv6_dst_lookup_flow = ip6_dst_lookup_flow,
1016         .ipv6_route_input  = ipv6_route_input,
1017         .fib6_get_table    = fib6_get_table,
1018         .fib6_table_lookup = fib6_table_lookup,
1019         .fib6_lookup       = fib6_lookup,
1020         .fib6_select_path  = fib6_select_path,
1021         .ip6_mtu_from_fib6 = ip6_mtu_from_fib6,
1022         .fib6_nh_init      = fib6_nh_init,
1023         .fib6_nh_release   = fib6_nh_release,
1024         .fib6_update_sernum = fib6_update_sernum_stub,
1025         .fib6_rt_update    = fib6_rt_update,
1026         .ip6_del_rt        = ip6_del_rt,
1027         .udpv6_encap_enable = udpv6_encap_enable,
1028         .ndisc_send_na = ndisc_send_na,
1029 #if IS_ENABLED(CONFIG_XFRM)
1030         .xfrm6_local_rxpmtu = xfrm6_local_rxpmtu,
1031         .xfrm6_udp_encap_rcv = xfrm6_udp_encap_rcv,
1032         .xfrm6_rcv_encap = xfrm6_rcv_encap,
1033 #endif
1034         .nd_tbl = &nd_tbl,
1035         .ipv6_fragment = ip6_fragment,
1036 };
1037
1038 static const struct ipv6_bpf_stub ipv6_bpf_stub_impl = {
1039         .inet6_bind = __inet6_bind,
1040         .udp6_lib_lookup = __udp6_lib_lookup,
1041 };
1042
1043 static int __init inet6_init(void)
1044 {
1045         struct list_head *r;
1046         int err = 0;
1047
1048         sock_skb_cb_check_size(sizeof(struct inet6_skb_parm));
1049
1050         /* Register the socket-side information for inet6_create.  */
1051         for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
1052                 INIT_LIST_HEAD(r);
1053
1054         if (disable_ipv6_mod) {
1055                 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
1056                 goto out;
1057         }
1058
1059         err = proto_register(&tcpv6_prot, 1);
1060         if (err)
1061                 goto out;
1062
1063         err = proto_register(&udpv6_prot, 1);
1064         if (err)
1065                 goto out_unregister_tcp_proto;
1066
1067         err = proto_register(&udplitev6_prot, 1);
1068         if (err)
1069                 goto out_unregister_udp_proto;
1070
1071         err = proto_register(&rawv6_prot, 1);
1072         if (err)
1073                 goto out_unregister_udplite_proto;
1074
1075         err = proto_register(&pingv6_prot, 1);
1076         if (err)
1077                 goto out_unregister_raw_proto;
1078
1079         /* We MUST register RAW sockets before we create the ICMP6,
1080          * IGMP6, or NDISC control sockets.
1081          */
1082         err = rawv6_init();
1083         if (err)
1084                 goto out_unregister_ping_proto;
1085
1086         /* Register the family here so that the init calls below will
1087          * be able to create sockets. (?? is this dangerous ??)
1088          */
1089         err = sock_register(&inet6_family_ops);
1090         if (err)
1091                 goto out_sock_register_fail;
1092
1093         /*
1094          *      ipngwg API draft makes clear that the correct semantics
1095          *      for TCP and UDP is to consider one TCP and UDP instance
1096          *      in a host available by both INET and INET6 APIs and
1097          *      able to communicate via both network protocols.
1098          */
1099
1100         err = register_pernet_subsys(&inet6_net_ops);
1101         if (err)
1102                 goto register_pernet_fail;
1103         err = ip6_mr_init();
1104         if (err)
1105                 goto ipmr_fail;
1106         err = icmpv6_init();
1107         if (err)
1108                 goto icmp_fail;
1109         err = ndisc_init();
1110         if (err)
1111                 goto ndisc_fail;
1112         err = igmp6_init();
1113         if (err)
1114                 goto igmp_fail;
1115
1116         err = ipv6_netfilter_init();
1117         if (err)
1118                 goto netfilter_fail;
1119         /* Create /proc/foo6 entries. */
1120 #ifdef CONFIG_PROC_FS
1121         err = -ENOMEM;
1122         if (raw6_proc_init())
1123                 goto proc_raw6_fail;
1124         if (udplite6_proc_init())
1125                 goto proc_udplite6_fail;
1126         if (ipv6_misc_proc_init())
1127                 goto proc_misc6_fail;
1128         if (if6_proc_init())
1129                 goto proc_if6_fail;
1130 #endif
1131         err = ip6_route_init();
1132         if (err)
1133                 goto ip6_route_fail;
1134         err = ndisc_late_init();
1135         if (err)
1136                 goto ndisc_late_fail;
1137         err = ip6_flowlabel_init();
1138         if (err)
1139                 goto ip6_flowlabel_fail;
1140         err = ipv6_anycast_init();
1141         if (err)
1142                 goto ipv6_anycast_fail;
1143         err = addrconf_init();
1144         if (err)
1145                 goto addrconf_fail;
1146
1147         /* Init v6 extension headers. */
1148         err = ipv6_exthdrs_init();
1149         if (err)
1150                 goto ipv6_exthdrs_fail;
1151
1152         err = ipv6_frag_init();
1153         if (err)
1154                 goto ipv6_frag_fail;
1155
1156         /* Init v6 transport protocols. */
1157         err = udpv6_init();
1158         if (err)
1159                 goto udpv6_fail;
1160
1161         err = udplitev6_init();
1162         if (err)
1163                 goto udplitev6_fail;
1164
1165         err = udpv6_offload_init();
1166         if (err)
1167                 goto udpv6_offload_fail;
1168
1169         err = tcpv6_init();
1170         if (err)
1171                 goto tcpv6_fail;
1172
1173         err = ipv6_packet_init();
1174         if (err)
1175                 goto ipv6_packet_fail;
1176
1177         err = pingv6_init();
1178         if (err)
1179                 goto pingv6_fail;
1180
1181         err = calipso_init();
1182         if (err)
1183                 goto calipso_fail;
1184
1185         err = seg6_init();
1186         if (err)
1187                 goto seg6_fail;
1188
1189         err = rpl_init();
1190         if (err)
1191                 goto rpl_fail;
1192
1193         err = igmp6_late_init();
1194         if (err)
1195                 goto igmp6_late_err;
1196
1197 #ifdef CONFIG_SYSCTL
1198         err = ipv6_sysctl_register();
1199         if (err)
1200                 goto sysctl_fail;
1201 #endif
1202
1203         /* ensure that ipv6 stubs are visible only after ipv6 is ready */
1204         wmb();
1205         ipv6_stub = &ipv6_stub_impl;
1206         ipv6_bpf_stub = &ipv6_bpf_stub_impl;
1207 out:
1208         return err;
1209
1210 #ifdef CONFIG_SYSCTL
1211 sysctl_fail:
1212         igmp6_late_cleanup();
1213 #endif
1214 igmp6_late_err:
1215         rpl_exit();
1216 rpl_fail:
1217         seg6_exit();
1218 seg6_fail:
1219         calipso_exit();
1220 calipso_fail:
1221         pingv6_exit();
1222 pingv6_fail:
1223         ipv6_packet_cleanup();
1224 ipv6_packet_fail:
1225         tcpv6_exit();
1226 tcpv6_fail:
1227         udpv6_offload_exit();
1228 udpv6_offload_fail:
1229         udplitev6_exit();
1230 udplitev6_fail:
1231         udpv6_exit();
1232 udpv6_fail:
1233         ipv6_frag_exit();
1234 ipv6_frag_fail:
1235         ipv6_exthdrs_exit();
1236 ipv6_exthdrs_fail:
1237         addrconf_cleanup();
1238 addrconf_fail:
1239         ipv6_anycast_cleanup();
1240 ipv6_anycast_fail:
1241         ip6_flowlabel_cleanup();
1242 ip6_flowlabel_fail:
1243         ndisc_late_cleanup();
1244 ndisc_late_fail:
1245         ip6_route_cleanup();
1246 ip6_route_fail:
1247 #ifdef CONFIG_PROC_FS
1248         if6_proc_exit();
1249 proc_if6_fail:
1250         ipv6_misc_proc_exit();
1251 proc_misc6_fail:
1252         udplite6_proc_exit();
1253 proc_udplite6_fail:
1254         raw6_proc_exit();
1255 proc_raw6_fail:
1256 #endif
1257         ipv6_netfilter_fini();
1258 netfilter_fail:
1259         igmp6_cleanup();
1260 igmp_fail:
1261         ndisc_cleanup();
1262 ndisc_fail:
1263         icmpv6_cleanup();
1264 icmp_fail:
1265         ip6_mr_cleanup();
1266 ipmr_fail:
1267         unregister_pernet_subsys(&inet6_net_ops);
1268 register_pernet_fail:
1269         sock_unregister(PF_INET6);
1270         rtnl_unregister_all(PF_INET6);
1271 out_sock_register_fail:
1272         rawv6_exit();
1273 out_unregister_ping_proto:
1274         proto_unregister(&pingv6_prot);
1275 out_unregister_raw_proto:
1276         proto_unregister(&rawv6_prot);
1277 out_unregister_udplite_proto:
1278         proto_unregister(&udplitev6_prot);
1279 out_unregister_udp_proto:
1280         proto_unregister(&udpv6_prot);
1281 out_unregister_tcp_proto:
1282         proto_unregister(&tcpv6_prot);
1283         goto out;
1284 }
1285 module_init(inet6_init);
1286
1287 MODULE_ALIAS_NETPROTO(PF_INET6);