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 #include <net/ioam6.h>
  66 #include <net/rawv6.h>
  67
  68 #include <linux/uaccess.h>
  69 #include <linux/mroute6.h>
  70
  71 #include "ip6_offload.h"
  72
  73 MODULE_AUTHOR("Cast of dozens");
  74 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
  75 MODULE_LICENSE("GPL");
  76
  77 /* The inetsw6 table contains everything that inet6_create needs to
  78  * build a new socket.
  79  */
  80 static struct list_head inetsw6[SOCK_MAX];
  81 static DEFINE_SPINLOCK(inetsw6_lock);
  82
  83 struct ipv6_params ipv6_defaults = {
  84         .disable_ipv6 = 0,
  85         .autoconf = 1,
  86 };
  87
  88 static int disable_ipv6_mod;
  89
  90 module_param_named(disable, disable_ipv6_mod, int, 0444);
  91 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
  92
  93 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
  94 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
  95
  96 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
  97 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
  98
  99 bool ipv6_mod_enabled(void)
 100 {
 101         return disable_ipv6_mod == 0;
 102 }
 103 EXPORT_SYMBOL_GPL(ipv6_mod_enabled);
 104
 105 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
 106 {
 107         const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
 108
 109         return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
 110 }
 111
 112 static int inet6_create(struct net *net, struct socket *sock, int protocol,
 113                         int kern)
 114 {
 115         struct inet_sock *inet;
 116         struct ipv6_pinfo *np;
 117         struct sock *sk;
 118         struct inet_protosw *answer;
 119         struct proto *answer_prot;
 120         unsigned char answer_flags;
 121         int try_loading_module = 0;
 122         int err;
 123
 124         if (protocol < 0 || protocol >= IPPROTO_MAX)
 125                 return -EINVAL;
 126
 127         /* Look for the requested type/protocol pair. */
 128 lookup_protocol:
 129         err = -ESOCKTNOSUPPORT;
 130         rcu_read_lock();
 131         list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
 132
 133                 err = 0;
 134                 /* Check the non-wild match. */
 135                 if (protocol == answer->protocol) {
 136                         if (protocol != IPPROTO_IP)
 137                                 break;
 138                 } else {
 139                         /* Check for the two wild cases. */
 140                         if (IPPROTO_IP == protocol) {
 141                                 protocol = answer->protocol;
 142                                 break;
 143                         }
 144                         if (IPPROTO_IP == answer->protocol)
 145                                 break;
 146                 }
 147                 err = -EPROTONOSUPPORT;
 148         }
 149
 150         if (err) {
 151                 if (try_loading_module < 2) {
 152                         rcu_read_unlock();
 153                         /*
 154                          * Be more specific, e.g. net-pf-10-proto-132-type-1
 155                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
 156                          */
 157                         if (++try_loading_module == 1)
 158                                 request_module("net-pf-%d-proto-%d-type-%d",
 159                                                 PF_INET6, protocol, sock->type);
 160                         /*
 161                          * Fall back to generic, e.g. net-pf-10-proto-132
 162                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
 163                          */
 164                         else
 165                                 request_module("net-pf-%d-proto-%d",
 166                                                 PF_INET6, protocol);
 167                         goto lookup_protocol;
 168                 } else
 169                         goto out_rcu_unlock;
 170         }
 171
 172         err = -EPERM;
 173         if (sock->type == SOCK_RAW && !kern &&
 174             !ns_capable(net->user_ns, CAP_NET_RAW))
 175                 goto out_rcu_unlock;
 176
 177         sock->ops = answer->ops;
 178         answer_prot = answer->prot;
 179         answer_flags = answer->flags;
 180         rcu_read_unlock();
 181
 182         WARN_ON(!answer_prot->slab);
 183
 184         err = -ENOBUFS;
 185         sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern);
 186         if (!sk)
 187                 goto out;
 188
 189         sock_init_data(sock, sk);
 190
 191         err = 0;
 192         if (INET_PROTOSW_REUSE & answer_flags)
 193                 sk->sk_reuse = SK_CAN_REUSE;
 194
 195         inet = inet_sk(sk);
 196         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
 197
 198         if (SOCK_RAW == sock->type) {
 199                 inet->inet_num = protocol;
 200                 if (IPPROTO_RAW == protocol)
 201                         inet->hdrincl = 1;
 202         }
 203
 204         sk->sk_destruct         = inet_sock_destruct;
 205         sk->sk_family           = PF_INET6;
 206         sk->sk_protocol         = protocol;
 207
 208         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
 209
 210         inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
 211         np->hop_limit   = -1;
 212         np->mcast_hops  = IPV6_DEFAULT_MCASTHOPS;
 213         np->mc_loop     = 1;
 214         np->mc_all      = 1;
 215         np->pmtudisc    = IPV6_PMTUDISC_WANT;
 216         np->repflow     = net->ipv6.sysctl.flowlabel_reflect & FLOWLABEL_REFLECT_ESTABLISHED;
 217         sk->sk_ipv6only = net->ipv6.sysctl.bindv6only;
 218
 219         /* Init the ipv4 part of the socket since we can have sockets
 220          * using v6 API for ipv4.
 221          */
 222         inet->uc_ttl    = -1;
 223
 224         inet->mc_loop   = 1;
 225         inet->mc_ttl    = 1;
 226         inet->mc_index  = 0;
 227         RCU_INIT_POINTER(inet->mc_list, NULL);
 228         inet->rcv_tos   = 0;
 229
 230         if (READ_ONCE(net->ipv4.sysctl_ip_no_pmtu_disc))
 231                 inet->pmtudisc = IP_PMTUDISC_DONT;
 232         else
 233                 inet->pmtudisc = IP_PMTUDISC_WANT;
 234         /*
 235          * Increment only the relevant sk_prot->socks debug field, this changes
 236          * the previous behaviour of incrementing both the equivalent to
 237          * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
 238          *
 239          * This allows better debug granularity as we'll know exactly how many
 240          * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
 241          * transport protocol socks. -acme
 242          */
 243         sk_refcnt_debug_inc(sk);
 244
 245         if (inet->inet_num) {
 246                 /* It assumes that any protocol which allows
 247                  * the user to assign a number at socket
 248                  * creation time automatically shares.
 249                  */
 250                 inet->inet_sport = htons(inet->inet_num);
 251                 err = sk->sk_prot->hash(sk);
 252                 if (err) {
 253                         sk_common_release(sk);
 254                         goto out;
 255                 }
 256         }
 257         if (sk->sk_prot->init) {
 258                 err = sk->sk_prot->init(sk);
 259                 if (err) {
 260                         sk_common_release(sk);
 261                         goto out;
 262                 }
 263         }
 264
 265         if (!kern) {
 266                 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
 267                 if (err) {
 268                         sk_common_release(sk);
 269                         goto out;
 270                 }
 271         }
 272 out:
 273         return err;
 274 out_rcu_unlock:
 275         rcu_read_unlock();
 276         goto out;
 277 }
 278
 279 static int __inet6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
 280                         u32 flags)
 281 {
 282         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
 283         struct inet_sock *inet = inet_sk(sk);
 284         struct ipv6_pinfo *np = inet6_sk(sk);
 285         struct net *net = sock_net(sk);
 286         __be32 v4addr = 0;
 287         unsigned short snum;
 288         bool saved_ipv6only;
 289         int addr_type = 0;
 290         int err = 0;
 291
 292         if (addr->sin6_family != AF_INET6)
 293                 return -EAFNOSUPPORT;
 294
 295         addr_type = ipv6_addr_type(&addr->sin6_addr);
 296         if ((addr_type & IPV6_ADDR_MULTICAST) && sk->sk_type == SOCK_STREAM)
 297                 return -EINVAL;
 298
 299         snum = ntohs(addr->sin6_port);
 300         if (!(flags & BIND_NO_CAP_NET_BIND_SERVICE) &&
 301             snum && inet_port_requires_bind_service(net, snum) &&
 302             !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
 303                 return -EACCES;
 304
 305         if (flags & BIND_WITH_LOCK)
 306                 lock_sock(sk);
 307
 308         /* Check these errors (active socket, double bind). */
 309         if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
 310                 err = -EINVAL;
 311                 goto out;
 312         }
 313
 314         /* Check if the address belongs to the host. */
 315         if (addr_type == IPV6_ADDR_MAPPED) {
 316                 struct net_device *dev = NULL;
 317                 int chk_addr_ret;
 318
 319                 /* Binding to v4-mapped address on a v6-only socket
 320                  * makes no sense
 321                  */
 322                 if (ipv6_only_sock(sk)) {
 323                         err = -EINVAL;
 324                         goto out;
 325                 }
 326
 327                 rcu_read_lock();
 328                 if (sk->sk_bound_dev_if) {
 329                         dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
 330                         if (!dev) {
 331                                 err = -ENODEV;
 332                                 goto out_unlock;
 333                         }
 334                 }
 335
 336                 /* Reproduce AF_INET checks to make the bindings consistent */
 337                 v4addr = addr->sin6_addr.s6_addr32[3];
 338                 chk_addr_ret = inet_addr_type_dev_table(net, dev, v4addr);
 339                 rcu_read_unlock();
 340
 341                 if (!inet_addr_valid_or_nonlocal(net, inet, v4addr,
 342                                                  chk_addr_ret)) {
 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                       (flags & BIND_FORCE_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                 if (!(flags & BIND_FROM_BPF)) {
 413                         err = BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk);
 414                         if (err) {
 415                                 sk->sk_ipv6only = saved_ipv6only;
 416                                 inet_reset_saddr(sk);
 417                                 if (sk->sk_prot->put_port)
 418                                         sk->sk_prot->put_port(sk);
 419                                 goto out;
 420                         }
 421                 }
 422         }
 423
 424         if (addr_type != IPV6_ADDR_ANY)
 425                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
 426         if (snum)
 427                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
 428         inet->inet_sport = htons(inet->inet_num);
 429         inet->inet_dport = 0;
 430         inet->inet_daddr = 0;
 431 out:
 432         if (flags & BIND_WITH_LOCK)
 433                 release_sock(sk);
 434         return err;
 435 out_unlock:
 436         rcu_read_unlock();
 437         goto out;
 438 }
 439
 440 /* bind for INET6 API */
 441 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 442 {
 443         struct sock *sk = sock->sk;
 444         u32 flags = BIND_WITH_LOCK;
 445         const struct proto *prot;
 446         int err = 0;
 447
 448         /* IPV6_ADDRFORM can change sk->sk_prot under us. */
 449         prot = READ_ONCE(sk->sk_prot);
 450         /* If the socket has its own bind function then use it. */
 451         if (prot->bind)
 452                 return prot->bind(sk, uaddr, addr_len);
 453
 454         if (addr_len < SIN6_LEN_RFC2133)
 455                 return -EINVAL;
 456
 457         /* BPF prog is run before any checks are done so that if the prog
 458          * changes context in a wrong way it will be caught.
 459          */
 460         err = BPF_CGROUP_RUN_PROG_INET_BIND_LOCK(sk, uaddr,
 461                                                  CGROUP_INET6_BIND, &flags);
 462         if (err)
 463                 return err;
 464
 465         return __inet6_bind(sk, uaddr, addr_len, flags);
 466 }
 467 EXPORT_SYMBOL(inet6_bind);
 468
 469 int inet6_release(struct socket *sock)
 470 {
 471         struct sock *sk = sock->sk;
 472
 473         if (!sk)
 474                 return -EINVAL;
 475
 476         /* Free mc lists */
 477         ipv6_sock_mc_close(sk);
 478
 479         /* Free ac lists */
 480         ipv6_sock_ac_close(sk);
 481
 482         return inet_release(sock);
 483 }
 484 EXPORT_SYMBOL(inet6_release);
 485
 486 void inet6_destroy_sock(struct sock *sk)
 487 {
 488         struct ipv6_pinfo *np = inet6_sk(sk);
 489         struct sk_buff *skb;
 490         struct ipv6_txoptions *opt;
 491
 492         /* Release rx options */
 493
 494         skb = xchg(&np->pktoptions, NULL);
 495         kfree_skb(skb);
 496
 497         skb = xchg(&np->rxpmtu, NULL);
 498         kfree_skb(skb);
 499
 500         /* Free flowlabels */
 501         fl6_free_socklist(sk);
 502
 503         /* Free tx options */
 504
 505         opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL);
 506         if (opt) {
 507                 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 508                 txopt_put(opt);
 509         }
 510 }
 511 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
 512
 513 void inet6_cleanup_sock(struct sock *sk)
 514 {
 515         inet6_destroy_sock(sk);
 516 }
 517 EXPORT_SYMBOL_GPL(inet6_cleanup_sock);
 518
 519 /*
 520  *      This does both peername and sockname.
 521  */
 522 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 523                   int peer)
 524 {
 525         struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
 526         struct sock *sk = sock->sk;
 527         struct inet_sock *inet = inet_sk(sk);
 528         struct ipv6_pinfo *np = inet6_sk(sk);
 529
 530         sin->sin6_family = AF_INET6;
 531         sin->sin6_flowinfo = 0;
 532         sin->sin6_scope_id = 0;
 533         lock_sock(sk);
 534         if (peer) {
 535                 if (!inet->inet_dport ||
 536                     (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
 537                     peer == 1)) {
 538                         release_sock(sk);
 539                         return -ENOTCONN;
 540                 }
 541                 sin->sin6_port = inet->inet_dport;
 542                 sin->sin6_addr = sk->sk_v6_daddr;
 543                 if (np->sndflow)
 544                         sin->sin6_flowinfo = np->flow_label;
 545                 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin,
 546                                        CGROUP_INET6_GETPEERNAME);
 547         } else {
 548                 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
 549                         sin->sin6_addr = np->saddr;
 550                 else
 551                         sin->sin6_addr = sk->sk_v6_rcv_saddr;
 552                 sin->sin6_port = inet->inet_sport;
 553                 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin,
 554                                        CGROUP_INET6_GETSOCKNAME);
 555         }
 556         sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
 557                                                  sk->sk_bound_dev_if);
 558         release_sock(sk);
 559         return sizeof(*sin);
 560 }
 561 EXPORT_SYMBOL(inet6_getname);
 562
 563 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 564 {
 565         void __user *argp = (void __user *)arg;
 566         struct sock *sk = sock->sk;
 567         struct net *net = sock_net(sk);
 568         const struct proto *prot;
 569
 570         switch (cmd) {
 571         case SIOCADDRT:
 572         case SIOCDELRT: {
 573                 struct in6_rtmsg rtmsg;
 574
 575                 if (copy_from_user(&rtmsg, argp, sizeof(rtmsg)))
 576                         return -EFAULT;
 577                 return ipv6_route_ioctl(net, cmd, &rtmsg);
 578         }
 579         case SIOCSIFADDR:
 580                 return addrconf_add_ifaddr(net, argp);
 581         case SIOCDIFADDR:
 582                 return addrconf_del_ifaddr(net, argp);
 583         case SIOCSIFDSTADDR:
 584                 return addrconf_set_dstaddr(net, argp);
 585         default:
 586                 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
 587                 prot = READ_ONCE(sk->sk_prot);
 588                 if (!prot->ioctl)
 589                         return -ENOIOCTLCMD;
 590                 return prot->ioctl(sk, cmd, arg);
 591         }
 592         /*NOTREACHED*/
 593         return 0;
 594 }
 595 EXPORT_SYMBOL(inet6_ioctl);
 596
 597 #ifdef CONFIG_COMPAT
 598 struct compat_in6_rtmsg {
 599         struct in6_addr         rtmsg_dst;
 600         struct in6_addr         rtmsg_src;
 601         struct in6_addr         rtmsg_gateway;
 602         u32                     rtmsg_type;
 603         u16                     rtmsg_dst_len;
 604         u16                     rtmsg_src_len;
 605         u32                     rtmsg_metric;
 606         u32                     rtmsg_info;
 607         u32                     rtmsg_flags;
 608         s32                     rtmsg_ifindex;
 609 };
 610
 611 static int inet6_compat_routing_ioctl(struct sock *sk, unsigned int cmd,
 612                 struct compat_in6_rtmsg __user *ur)
 613 {
 614         struct in6_rtmsg rt;
 615
 616         if (copy_from_user(&rt.rtmsg_dst, &ur->rtmsg_dst,
 617                         3 * sizeof(struct in6_addr)) ||
 618             get_user(rt.rtmsg_type, &ur->rtmsg_type) ||
 619             get_user(rt.rtmsg_dst_len, &ur->rtmsg_dst_len) ||
 620             get_user(rt.rtmsg_src_len, &ur->rtmsg_src_len) ||
 621             get_user(rt.rtmsg_metric, &ur->rtmsg_metric) ||
 622             get_user(rt.rtmsg_info, &ur->rtmsg_info) ||
 623             get_user(rt.rtmsg_flags, &ur->rtmsg_flags) ||
 624             get_user(rt.rtmsg_ifindex, &ur->rtmsg_ifindex))
 625                 return -EFAULT;
 626
 627
 628         return ipv6_route_ioctl(sock_net(sk), cmd, &rt);
 629 }
 630
 631 int inet6_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 632 {
 633         void __user *argp = compat_ptr(arg);
 634         struct sock *sk = sock->sk;
 635
 636         switch (cmd) {
 637         case SIOCADDRT:
 638         case SIOCDELRT:
 639                 return inet6_compat_routing_ioctl(sk, cmd, argp);
 640         default:
 641                 return -ENOIOCTLCMD;
 642         }
 643 }
 644 EXPORT_SYMBOL_GPL(inet6_compat_ioctl);
 645 #endif /* CONFIG_COMPAT */
 646
 647 INDIRECT_CALLABLE_DECLARE(int udpv6_sendmsg(struct sock *, struct msghdr *,
 648                                             size_t));
 649 int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
 650 {
 651         struct sock *sk = sock->sk;
 652         const struct proto *prot;
 653
 654         if (unlikely(inet_send_prepare(sk)))
 655                 return -EAGAIN;
 656
 657         /* IPV6_ADDRFORM can change sk->sk_prot under us. */
 658         prot = READ_ONCE(sk->sk_prot);
 659         return INDIRECT_CALL_2(prot->sendmsg, tcp_sendmsg, udpv6_sendmsg,
 660                                sk, msg, size);
 661 }
 662
 663 INDIRECT_CALLABLE_DECLARE(int udpv6_recvmsg(struct sock *, struct msghdr *,
 664                                             size_t, int, int *));
 665 int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
 666                   int flags)
 667 {
 668         struct sock *sk = sock->sk;
 669         const struct proto *prot;
 670         int addr_len = 0;
 671         int err;
 672
 673         if (likely(!(flags & MSG_ERRQUEUE)))
 674                 sock_rps_record_flow(sk);
 675
 676         /* IPV6_ADDRFORM can change sk->sk_prot under us. */
 677         prot = READ_ONCE(sk->sk_prot);
 678         err = INDIRECT_CALL_2(prot->recvmsg, tcp_recvmsg, udpv6_recvmsg,
 679                               sk, msg, size, flags, &addr_len);
 680         if (err >= 0)
 681                 msg->msg_namelen = addr_len;
 682         return err;
 683 }
 684
 685 const struct proto_ops inet6_stream_ops = {
 686         .family            = PF_INET6,
 687         .owner             = THIS_MODULE,
 688         .release           = inet6_release,
 689         .bind              = inet6_bind,
 690         .connect           = inet_stream_connect,       /* ok           */
 691         .socketpair        = sock_no_socketpair,        /* a do nothing */
 692         .accept            = inet_accept,               /* ok           */
 693         .getname           = inet6_getname,
 694         .poll              = tcp_poll,                  /* ok           */
 695         .ioctl             = inet6_ioctl,               /* must change  */
 696         .gettstamp         = sock_gettstamp,
 697         .listen            = inet_listen,               /* ok           */
 698         .shutdown          = inet_shutdown,             /* ok           */
 699         .setsockopt        = sock_common_setsockopt,    /* ok           */
 700         .getsockopt        = sock_common_getsockopt,    /* ok           */
 701         .sendmsg           = inet6_sendmsg,             /* retpoline's sake */
 702         .recvmsg           = inet6_recvmsg,             /* retpoline's sake */
 703 #ifdef CONFIG_MMU
 704         .mmap              = tcp_mmap,
 705 #endif
 706         .sendpage          = inet_sendpage,
 707         .sendmsg_locked    = tcp_sendmsg_locked,
 708         .sendpage_locked   = tcp_sendpage_locked,
 709         .splice_read       = tcp_splice_read,
 710         .read_sock         = tcp_read_sock,
 711         .read_skb          = tcp_read_skb,
 712         .peek_len          = tcp_peek_len,
 713 #ifdef CONFIG_COMPAT
 714         .compat_ioctl      = inet6_compat_ioctl,
 715 #endif
 716         .set_rcvlowat      = tcp_set_rcvlowat,
 717 };
 718
 719 const struct proto_ops inet6_dgram_ops = {
 720         .family            = PF_INET6,
 721         .owner             = THIS_MODULE,
 722         .release           = inet6_release,
 723         .bind              = inet6_bind,
 724         .connect           = inet_dgram_connect,        /* ok           */
 725         .socketpair        = sock_no_socketpair,        /* a do nothing */
 726         .accept            = sock_no_accept,            /* a do nothing */
 727         .getname           = inet6_getname,
 728         .poll              = udp_poll,                  /* ok           */
 729         .ioctl             = inet6_ioctl,               /* must change  */
 730         .gettstamp         = sock_gettstamp,
 731         .listen            = sock_no_listen,            /* ok           */
 732         .shutdown          = inet_shutdown,             /* ok           */
 733         .setsockopt        = sock_common_setsockopt,    /* ok           */
 734         .getsockopt        = sock_common_getsockopt,    /* ok           */
 735         .sendmsg           = inet6_sendmsg,             /* retpoline's sake */
 736         .recvmsg           = inet6_recvmsg,             /* retpoline's sake */
 737         .read_skb          = udp_read_skb,
 738         .mmap              = sock_no_mmap,
 739         .sendpage          = sock_no_sendpage,
 740         .set_peek_off      = sk_set_peek_off,
 741 #ifdef CONFIG_COMPAT
 742         .compat_ioctl      = inet6_compat_ioctl,
 743 #endif
 744 };
 745
 746 static const struct net_proto_family inet6_family_ops = {
 747         .family = PF_INET6,
 748         .create = inet6_create,
 749         .owner  = THIS_MODULE,
 750 };
 751
 752 int inet6_register_protosw(struct inet_protosw *p)
 753 {
 754         struct list_head *lh;
 755         struct inet_protosw *answer;
 756         struct list_head *last_perm;
 757         int protocol = p->protocol;
 758         int ret;
 759
 760         spin_lock_bh(&inetsw6_lock);
 761
 762         ret = -EINVAL;
 763         if (p->type >= SOCK_MAX)
 764                 goto out_illegal;
 765
 766         /* If we are trying to override a permanent protocol, bail. */
 767         answer = NULL;
 768         ret = -EPERM;
 769         last_perm = &inetsw6[p->type];
 770         list_for_each(lh, &inetsw6[p->type]) {
 771                 answer = list_entry(lh, struct inet_protosw, list);
 772
 773                 /* Check only the non-wild match. */
 774                 if (INET_PROTOSW_PERMANENT & answer->flags) {
 775                         if (protocol == answer->protocol)
 776                                 break;
 777                         last_perm = lh;
 778                 }
 779
 780                 answer = NULL;
 781         }
 782         if (answer)
 783                 goto out_permanent;
 784
 785         /* Add the new entry after the last permanent entry if any, so that
 786          * the new entry does not override a permanent entry when matched with
 787          * a wild-card protocol. But it is allowed to override any existing
 788          * non-permanent entry.  This means that when we remove this entry, the
 789          * system automatically returns to the old behavior.
 790          */
 791         list_add_rcu(&p->list, last_perm);
 792         ret = 0;
 793 out:
 794         spin_unlock_bh(&inetsw6_lock);
 795         return ret;
 796
 797 out_permanent:
 798         pr_err("Attempt to override permanent protocol %d\n", protocol);
 799         goto out;
 800
 801 out_illegal:
 802         pr_err("Ignoring attempt to register invalid socket type %d\n",
 803                p->type);
 804         goto out;
 805 }
 806 EXPORT_SYMBOL(inet6_register_protosw);
 807
 808 void
 809 inet6_unregister_protosw(struct inet_protosw *p)
 810 {
 811         if (INET_PROTOSW_PERMANENT & p->flags) {
 812                 pr_err("Attempt to unregister permanent protocol %d\n",
 813                        p->protocol);
 814         } else {
 815                 spin_lock_bh(&inetsw6_lock);
 816                 list_del_rcu(&p->list);
 817                 spin_unlock_bh(&inetsw6_lock);
 818
 819                 synchronize_net();
 820         }
 821 }
 822 EXPORT_SYMBOL(inet6_unregister_protosw);
 823
 824 int inet6_sk_rebuild_header(struct sock *sk)
 825 {
 826         struct ipv6_pinfo *np = inet6_sk(sk);
 827         struct dst_entry *dst;
 828
 829         dst = __sk_dst_check(sk, np->dst_cookie);
 830
 831         if (!dst) {
 832                 struct inet_sock *inet = inet_sk(sk);
 833                 struct in6_addr *final_p, final;
 834                 struct flowi6 fl6;
 835
 836                 memset(&fl6, 0, sizeof(fl6));
 837                 fl6.flowi6_proto = sk->sk_protocol;
 838                 fl6.daddr = sk->sk_v6_daddr;
 839                 fl6.saddr = np->saddr;
 840                 fl6.flowlabel = np->flow_label;
 841                 fl6.flowi6_oif = sk->sk_bound_dev_if;
 842                 fl6.flowi6_mark = sk->sk_mark;
 843                 fl6.fl6_dport = inet->inet_dport;
 844                 fl6.fl6_sport = inet->inet_sport;
 845                 fl6.flowi6_uid = sk->sk_uid;
 846                 security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6));
 847
 848                 rcu_read_lock();
 849                 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt),
 850                                          &final);
 851                 rcu_read_unlock();
 852
 853                 dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
 854                 if (IS_ERR(dst)) {
 855                         sk->sk_route_caps = 0;
 856                         sk->sk_err_soft = -PTR_ERR(dst);
 857                         return PTR_ERR(dst);
 858                 }
 859
 860                 ip6_dst_store(sk, dst, NULL, NULL);
 861         }
 862
 863         return 0;
 864 }
 865 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
 866
 867 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
 868                        const struct inet6_skb_parm *opt)
 869 {
 870         const struct ipv6_pinfo *np = inet6_sk(sk);
 871
 872         if (np->rxopt.all) {
 873                 if (((opt->flags & IP6SKB_HOPBYHOP) &&
 874                      (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) ||
 875                     (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) &&
 876                      np->rxopt.bits.rxflow) ||
 877                     (opt->srcrt && (np->rxopt.bits.srcrt ||
 878                      np->rxopt.bits.osrcrt)) ||
 879                     ((opt->dst1 || opt->dst0) &&
 880                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
 881                         return true;
 882         }
 883         return false;
 884 }
 885 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
 886
 887 static struct packet_type ipv6_packet_type __read_mostly = {
 888         .type = cpu_to_be16(ETH_P_IPV6),
 889         .func = ipv6_rcv,
 890         .list_func = ipv6_list_rcv,
 891 };
 892
 893 static int __init ipv6_packet_init(void)
 894 {
 895         dev_add_pack(&ipv6_packet_type);
 896         return 0;
 897 }
 898
 899 static void ipv6_packet_cleanup(void)
 900 {
 901         dev_remove_pack(&ipv6_packet_type);
 902 }
 903
 904 static int __net_init ipv6_init_mibs(struct net *net)
 905 {
 906         int i;
 907
 908         net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib);
 909         if (!net->mib.udp_stats_in6)
 910                 return -ENOMEM;
 911         net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib);
 912         if (!net->mib.udplite_stats_in6)
 913                 goto err_udplite_mib;
 914         net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib);
 915         if (!net->mib.ipv6_statistics)
 916                 goto err_ip_mib;
 917
 918         for_each_possible_cpu(i) {
 919                 struct ipstats_mib *af_inet6_stats;
 920                 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i);
 921                 u64_stats_init(&af_inet6_stats->syncp);
 922         }
 923
 924
 925         net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib);
 926         if (!net->mib.icmpv6_statistics)
 927                 goto err_icmp_mib;
 928         net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
 929                                                 GFP_KERNEL);
 930         if (!net->mib.icmpv6msg_statistics)
 931                 goto err_icmpmsg_mib;
 932         return 0;
 933
 934 err_icmpmsg_mib:
 935         free_percpu(net->mib.icmpv6_statistics);
 936 err_icmp_mib:
 937         free_percpu(net->mib.ipv6_statistics);
 938 err_ip_mib:
 939         free_percpu(net->mib.udplite_stats_in6);
 940 err_udplite_mib:
 941         free_percpu(net->mib.udp_stats_in6);
 942         return -ENOMEM;
 943 }
 944
 945 static void ipv6_cleanup_mibs(struct net *net)
 946 {
 947         free_percpu(net->mib.udp_stats_in6);
 948         free_percpu(net->mib.udplite_stats_in6);
 949         free_percpu(net->mib.ipv6_statistics);
 950         free_percpu(net->mib.icmpv6_statistics);
 951         kfree(net->mib.icmpv6msg_statistics);
 952 }
 953
 954 static int __net_init inet6_net_init(struct net *net)
 955 {
 956         int err = 0;
 957
 958         net->ipv6.sysctl.bindv6only = 0;
 959         net->ipv6.sysctl.icmpv6_time = 1*HZ;
 960         net->ipv6.sysctl.icmpv6_echo_ignore_all = 0;
 961         net->ipv6.sysctl.icmpv6_echo_ignore_multicast = 0;
 962         net->ipv6.sysctl.icmpv6_echo_ignore_anycast = 0;
 963
 964         /* By default, rate limit error messages.
 965          * Except for pmtu discovery, it would break it.
 966          * proc_do_large_bitmap needs pointer to the bitmap.
 967          */
 968         bitmap_set(net->ipv6.sysctl.icmpv6_ratemask, 0, ICMPV6_ERRMSG_MAX + 1);
 969         bitmap_clear(net->ipv6.sysctl.icmpv6_ratemask, ICMPV6_PKT_TOOBIG, 1);
 970         net->ipv6.sysctl.icmpv6_ratemask_ptr = net->ipv6.sysctl.icmpv6_ratemask;
 971
 972         net->ipv6.sysctl.flowlabel_consistency = 1;
 973         net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS;
 974         net->ipv6.sysctl.idgen_retries = 3;
 975         net->ipv6.sysctl.idgen_delay = 1 * HZ;
 976         net->ipv6.sysctl.flowlabel_state_ranges = 0;
 977         net->ipv6.sysctl.max_dst_opts_cnt = IP6_DEFAULT_MAX_DST_OPTS_CNT;
 978         net->ipv6.sysctl.max_hbh_opts_cnt = IP6_DEFAULT_MAX_HBH_OPTS_CNT;
 979         net->ipv6.sysctl.max_dst_opts_len = IP6_DEFAULT_MAX_DST_OPTS_LEN;
 980         net->ipv6.sysctl.max_hbh_opts_len = IP6_DEFAULT_MAX_HBH_OPTS_LEN;
 981         net->ipv6.sysctl.fib_notify_on_flag_change = 0;
 982         atomic_set(&net->ipv6.fib6_sernum, 1);
 983
 984         net->ipv6.sysctl.ioam6_id = IOAM6_DEFAULT_ID;
 985         net->ipv6.sysctl.ioam6_id_wide = IOAM6_DEFAULT_ID_WIDE;
 986
 987         err = ipv6_init_mibs(net);
 988         if (err)
 989                 return err;
 990 #ifdef CONFIG_PROC_FS
 991         err = udp6_proc_init(net);
 992         if (err)
 993                 goto out;
 994         err = tcp6_proc_init(net);
 995         if (err)
 996                 goto proc_tcp6_fail;
 997         err = ac6_proc_init(net);
 998         if (err)
 999                 goto proc_ac6_fail;
1000 #endif
1001         return err;
1002
1003 #ifdef CONFIG_PROC_FS
1004 proc_ac6_fail:
1005         tcp6_proc_exit(net);
1006 proc_tcp6_fail:
1007         udp6_proc_exit(net);
1008 out:
1009         ipv6_cleanup_mibs(net);
1010         return err;
1011 #endif
1012 }
1013
1014 static void __net_exit inet6_net_exit(struct net *net)
1015 {
1016 #ifdef CONFIG_PROC_FS
1017         udp6_proc_exit(net);
1018         tcp6_proc_exit(net);
1019         ac6_proc_exit(net);
1020 #endif
1021         ipv6_cleanup_mibs(net);
1022 }
1023
1024 static struct pernet_operations inet6_net_ops = {
1025         .init = inet6_net_init,
1026         .exit = inet6_net_exit,
1027 };
1028
1029 static int ipv6_route_input(struct sk_buff *skb)
1030 {
1031         ip6_route_input(skb);
1032         return skb_dst(skb)->error;
1033 }
1034
1035 static const struct ipv6_stub ipv6_stub_impl = {
1036         .ipv6_sock_mc_join = ipv6_sock_mc_join,
1037         .ipv6_sock_mc_drop = ipv6_sock_mc_drop,
1038         .ipv6_dst_lookup_flow = ip6_dst_lookup_flow,
1039         .ipv6_route_input  = ipv6_route_input,
1040         .fib6_get_table    = fib6_get_table,
1041         .fib6_table_lookup = fib6_table_lookup,
1042         .fib6_lookup       = fib6_lookup,
1043         .fib6_select_path  = fib6_select_path,
1044         .ip6_mtu_from_fib6 = ip6_mtu_from_fib6,
1045         .fib6_nh_init      = fib6_nh_init,
1046         .fib6_nh_release   = fib6_nh_release,
1047         .fib6_nh_release_dsts = fib6_nh_release_dsts,
1048         .fib6_update_sernum = fib6_update_sernum_stub,
1049         .fib6_rt_update    = fib6_rt_update,
1050         .ip6_del_rt        = ip6_del_rt,
1051         .udpv6_encap_enable = udpv6_encap_enable,
1052         .ndisc_send_na = ndisc_send_na,
1053 #if IS_ENABLED(CONFIG_XFRM)
1054         .xfrm6_local_rxpmtu = xfrm6_local_rxpmtu,
1055         .xfrm6_udp_encap_rcv = xfrm6_udp_encap_rcv,
1056         .xfrm6_rcv_encap = xfrm6_rcv_encap,
1057 #endif
1058         .nd_tbl = &nd_tbl,
1059         .ipv6_fragment = ip6_fragment,
1060         .ipv6_dev_find = ipv6_dev_find,
1061 };
1062
1063 static const struct ipv6_bpf_stub ipv6_bpf_stub_impl = {
1064         .inet6_bind = __inet6_bind,
1065         .udp6_lib_lookup = __udp6_lib_lookup,
1066         .ipv6_setsockopt = do_ipv6_setsockopt,
1067         .ipv6_getsockopt = do_ipv6_getsockopt,
1068 };
1069
1070 static int __init inet6_init(void)
1071 {
1072         struct list_head *r;
1073         int err = 0;
1074
1075         sock_skb_cb_check_size(sizeof(struct inet6_skb_parm));
1076
1077         /* Register the socket-side information for inet6_create.  */
1078         for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
1079                 INIT_LIST_HEAD(r);
1080
1081         raw_hashinfo_init(&raw_v6_hashinfo);
1082
1083         if (disable_ipv6_mod) {
1084                 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
1085                 goto out;
1086         }
1087
1088         err = proto_register(&tcpv6_prot, 1);
1089         if (err)
1090                 goto out;
1091
1092         err = proto_register(&udpv6_prot, 1);
1093         if (err)
1094                 goto out_unregister_tcp_proto;
1095
1096         err = proto_register(&udplitev6_prot, 1);
1097         if (err)
1098                 goto out_unregister_udp_proto;
1099
1100         err = proto_register(&rawv6_prot, 1);
1101         if (err)
1102                 goto out_unregister_udplite_proto;
1103
1104         err = proto_register(&pingv6_prot, 1);
1105         if (err)
1106                 goto out_unregister_raw_proto;
1107
1108         /* We MUST register RAW sockets before we create the ICMP6,
1109          * IGMP6, or NDISC control sockets.
1110          */
1111         err = rawv6_init();
1112         if (err)
1113                 goto out_unregister_ping_proto;
1114
1115         /* Register the family here so that the init calls below will
1116          * be able to create sockets. (?? is this dangerous ??)
1117          */
1118         err = sock_register(&inet6_family_ops);
1119         if (err)
1120                 goto out_sock_register_fail;
1121
1122         /*
1123          *      ipngwg API draft makes clear that the correct semantics
1124          *      for TCP and UDP is to consider one TCP and UDP instance
1125          *      in a host available by both INET and INET6 APIs and
1126          *      able to communicate via both network protocols.
1127          */
1128
1129         err = register_pernet_subsys(&inet6_net_ops);
1130         if (err)
1131                 goto register_pernet_fail;
1132         err = ip6_mr_init();
1133         if (err)
1134                 goto ipmr_fail;
1135         err = icmpv6_init();
1136         if (err)
1137                 goto icmp_fail;
1138         err = ndisc_init();
1139         if (err)
1140                 goto ndisc_fail;
1141         err = igmp6_init();
1142         if (err)
1143                 goto igmp_fail;
1144
1145         err = ipv6_netfilter_init();
1146         if (err)
1147                 goto netfilter_fail;
1148         /* Create /proc/foo6 entries. */
1149 #ifdef CONFIG_PROC_FS
1150         err = -ENOMEM;
1151         if (raw6_proc_init())
1152                 goto proc_raw6_fail;
1153         if (udplite6_proc_init())
1154                 goto proc_udplite6_fail;
1155         if (ipv6_misc_proc_init())
1156                 goto proc_misc6_fail;
1157         if (if6_proc_init())
1158                 goto proc_if6_fail;
1159 #endif
1160         err = ip6_route_init();
1161         if (err)
1162                 goto ip6_route_fail;
1163         err = ndisc_late_init();
1164         if (err)
1165                 goto ndisc_late_fail;
1166         err = ip6_flowlabel_init();
1167         if (err)
1168                 goto ip6_flowlabel_fail;
1169         err = ipv6_anycast_init();
1170         if (err)
1171                 goto ipv6_anycast_fail;
1172         err = addrconf_init();
1173         if (err)
1174                 goto addrconf_fail;
1175
1176         /* Init v6 extension headers. */
1177         err = ipv6_exthdrs_init();
1178         if (err)
1179                 goto ipv6_exthdrs_fail;
1180
1181         err = ipv6_frag_init();
1182         if (err)
1183                 goto ipv6_frag_fail;
1184
1185         /* Init v6 transport protocols. */
1186         err = udpv6_init();
1187         if (err)
1188                 goto udpv6_fail;
1189
1190         err = udplitev6_init();
1191         if (err)
1192                 goto udplitev6_fail;
1193
1194         err = udpv6_offload_init();
1195         if (err)
1196                 goto udpv6_offload_fail;
1197
1198         err = tcpv6_init();
1199         if (err)
1200                 goto tcpv6_fail;
1201
1202         err = ipv6_packet_init();
1203         if (err)
1204                 goto ipv6_packet_fail;
1205
1206         err = pingv6_init();
1207         if (err)
1208                 goto pingv6_fail;
1209
1210         err = calipso_init();
1211         if (err)
1212                 goto calipso_fail;
1213
1214         err = seg6_init();
1215         if (err)
1216                 goto seg6_fail;
1217
1218         err = rpl_init();
1219         if (err)
1220                 goto rpl_fail;
1221
1222         err = ioam6_init();
1223         if (err)
1224                 goto ioam6_fail;
1225
1226         err = igmp6_late_init();
1227         if (err)
1228                 goto igmp6_late_err;
1229
1230 #ifdef CONFIG_SYSCTL
1231         err = ipv6_sysctl_register();
1232         if (err)
1233                 goto sysctl_fail;
1234 #endif
1235
1236         /* ensure that ipv6 stubs are visible only after ipv6 is ready */
1237         wmb();
1238         ipv6_stub = &ipv6_stub_impl;
1239         ipv6_bpf_stub = &ipv6_bpf_stub_impl;
1240 out:
1241         return err;
1242
1243 #ifdef CONFIG_SYSCTL
1244 sysctl_fail:
1245         igmp6_late_cleanup();
1246 #endif
1247 igmp6_late_err:
1248         ioam6_exit();
1249 ioam6_fail:
1250         rpl_exit();
1251 rpl_fail:
1252         seg6_exit();
1253 seg6_fail:
1254         calipso_exit();
1255 calipso_fail:
1256         pingv6_exit();
1257 pingv6_fail:
1258         ipv6_packet_cleanup();
1259 ipv6_packet_fail:
1260         tcpv6_exit();
1261 tcpv6_fail:
1262         udpv6_offload_exit();
1263 udpv6_offload_fail:
1264         udplitev6_exit();
1265 udplitev6_fail:
1266         udpv6_exit();
1267 udpv6_fail:
1268         ipv6_frag_exit();
1269 ipv6_frag_fail:
1270         ipv6_exthdrs_exit();
1271 ipv6_exthdrs_fail:
1272         addrconf_cleanup();
1273 addrconf_fail:
1274         ipv6_anycast_cleanup();
1275 ipv6_anycast_fail:
1276         ip6_flowlabel_cleanup();
1277 ip6_flowlabel_fail:
1278         ndisc_late_cleanup();
1279 ndisc_late_fail:
1280         ip6_route_cleanup();
1281 ip6_route_fail:
1282 #ifdef CONFIG_PROC_FS
1283         if6_proc_exit();
1284 proc_if6_fail:
1285         ipv6_misc_proc_exit();
1286 proc_misc6_fail:
1287         udplite6_proc_exit();
1288 proc_udplite6_fail:
1289         raw6_proc_exit();
1290 proc_raw6_fail:
1291 #endif
1292         ipv6_netfilter_fini();
1293 netfilter_fail:
1294         igmp6_cleanup();
1295 igmp_fail:
1296         ndisc_cleanup();
1297 ndisc_fail:
1298         icmpv6_cleanup();
1299 icmp_fail:
1300         ip6_mr_cleanup();
1301 ipmr_fail:
1302         unregister_pernet_subsys(&inet6_net_ops);
1303 register_pernet_fail:
1304         sock_unregister(PF_INET6);
1305         rtnl_unregister_all(PF_INET6);
1306 out_sock_register_fail:
1307         rawv6_exit();
1308 out_unregister_ping_proto:
1309         proto_unregister(&pingv6_prot);
1310 out_unregister_raw_proto:
1311         proto_unregister(&rawv6_prot);
1312 out_unregister_udplite_proto:
1313         proto_unregister(&udplitev6_prot);
1314 out_unregister_udp_proto:
1315         proto_unregister(&udpv6_prot);
1316 out_unregister_tcp_proto:
1317         proto_unregister(&tcpv6_prot);
1318         goto out;
1319 }
1320 module_init(inet6_init);
1321
1322 MODULE_ALIAS_NETPROTO(PF_INET6);