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 struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
 106 {
 107         const int offset = sk->sk_prot->ipv6_pinfo_offset;
 108
 109         return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
 110 }
 111
 112 void inet6_sock_destruct(struct sock *sk)
 113 {
 114         inet6_cleanup_sock(sk);
 115         inet_sock_destruct(sk);
 116 }
 117 EXPORT_SYMBOL_GPL(inet6_sock_destruct);
 118
 119 static int inet6_create(struct net *net, struct socket *sock, int protocol,
 120                         int kern)
 121 {
 122         struct inet_sock *inet;
 123         struct ipv6_pinfo *np;
 124         struct sock *sk;
 125         struct inet_protosw *answer;
 126         struct proto *answer_prot;
 127         unsigned char answer_flags;
 128         int try_loading_module = 0;
 129         int err;
 130
 131         if (protocol < 0 || protocol >= IPPROTO_MAX)
 132                 return -EINVAL;
 133
 134         /* Look for the requested type/protocol pair. */
 135 lookup_protocol:
 136         err = -ESOCKTNOSUPPORT;
 137         rcu_read_lock();
 138         list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
 139
 140                 err = 0;
 141                 /* Check the non-wild match. */
 142                 if (protocol == answer->protocol) {
 143                         if (protocol != IPPROTO_IP)
 144                                 break;
 145                 } else {
 146                         /* Check for the two wild cases. */
 147                         if (IPPROTO_IP == protocol) {
 148                                 protocol = answer->protocol;
 149                                 break;
 150                         }
 151                         if (IPPROTO_IP == answer->protocol)
 152                                 break;
 153                 }
 154                 err = -EPROTONOSUPPORT;
 155         }
 156
 157         if (err) {
 158                 if (try_loading_module < 2) {
 159                         rcu_read_unlock();
 160                         /*
 161                          * Be more specific, e.g. net-pf-10-proto-132-type-1
 162                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
 163                          */
 164                         if (++try_loading_module == 1)
 165                                 request_module("net-pf-%d-proto-%d-type-%d",
 166                                                 PF_INET6, protocol, sock->type);
 167                         /*
 168                          * Fall back to generic, e.g. net-pf-10-proto-132
 169                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
 170                          */
 171                         else
 172                                 request_module("net-pf-%d-proto-%d",
 173                                                 PF_INET6, protocol);
 174                         goto lookup_protocol;
 175                 } else
 176                         goto out_rcu_unlock;
 177         }
 178
 179         err = -EPERM;
 180         if (sock->type == SOCK_RAW && !kern &&
 181             !ns_capable(net->user_ns, CAP_NET_RAW))
 182                 goto out_rcu_unlock;
 183
 184         sock->ops = answer->ops;
 185         answer_prot = answer->prot;
 186         answer_flags = answer->flags;
 187         rcu_read_unlock();
 188
 189         WARN_ON(!answer_prot->slab);
 190
 191         err = -ENOBUFS;
 192         sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern);
 193         if (!sk)
 194                 goto out;
 195
 196         sock_init_data(sock, sk);
 197
 198         err = 0;
 199         if (INET_PROTOSW_REUSE & answer_flags)
 200                 sk->sk_reuse = SK_CAN_REUSE;
 201
 202         if (INET_PROTOSW_ICSK & answer_flags)
 203                 inet_init_csk_locks(sk);
 204
 205         inet = inet_sk(sk);
 206         inet_assign_bit(IS_ICSK, sk, INET_PROTOSW_ICSK & answer_flags);
 207
 208         if (SOCK_RAW == sock->type) {
 209                 inet->inet_num = protocol;
 210                 if (IPPROTO_RAW == protocol)
 211                         inet_set_bit(HDRINCL, sk);
 212         }
 213
 214         sk->sk_destruct         = inet6_sock_destruct;
 215         sk->sk_family           = PF_INET6;
 216         sk->sk_protocol         = protocol;
 217
 218         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
 219
 220         inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
 221         np->hop_limit   = -1;
 222         np->mcast_hops  = IPV6_DEFAULT_MCASTHOPS;
 223         np->mc_loop     = 1;
 224         np->mc_all      = 1;
 225         np->pmtudisc    = IPV6_PMTUDISC_WANT;
 226         np->repflow     = net->ipv6.sysctl.flowlabel_reflect & FLOWLABEL_REFLECT_ESTABLISHED;
 227         sk->sk_ipv6only = net->ipv6.sysctl.bindv6only;
 228         sk->sk_txrehash = READ_ONCE(net->core.sysctl_txrehash);
 229
 230         /* Init the ipv4 part of the socket since we can have sockets
 231          * using v6 API for ipv4.
 232          */
 233         inet->uc_ttl    = -1;
 234
 235         inet_set_bit(MC_LOOP, sk);
 236         inet->mc_ttl    = 1;
 237         inet->mc_index  = 0;
 238         RCU_INIT_POINTER(inet->mc_list, NULL);
 239         inet->rcv_tos   = 0;
 240
 241         if (READ_ONCE(net->ipv4.sysctl_ip_no_pmtu_disc))
 242                 inet->pmtudisc = IP_PMTUDISC_DONT;
 243         else
 244                 inet->pmtudisc = IP_PMTUDISC_WANT;
 245
 246         if (inet->inet_num) {
 247                 /* It assumes that any protocol which allows
 248                  * the user to assign a number at socket
 249                  * creation time automatically shares.
 250                  */
 251                 inet->inet_sport = htons(inet->inet_num);
 252                 err = sk->sk_prot->hash(sk);
 253                 if (err) {
 254                         sk_common_release(sk);
 255                         goto out;
 256                 }
 257         }
 258         if (sk->sk_prot->init) {
 259                 err = sk->sk_prot->init(sk);
 260                 if (err) {
 261                         sk_common_release(sk);
 262                         goto out;
 263                 }
 264         }
 265
 266         if (!kern) {
 267                 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
 268                 if (err) {
 269                         sk_common_release(sk);
 270                         goto out;
 271                 }
 272         }
 273 out:
 274         return err;
 275 out_rcu_unlock:
 276         rcu_read_unlock();
 277         goto out;
 278 }
 279
 280 static int __inet6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
 281                         u32 flags)
 282 {
 283         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
 284         struct inet_sock *inet = inet_sk(sk);
 285         struct ipv6_pinfo *np = inet6_sk(sk);
 286         struct net *net = sock_net(sk);
 287         __be32 v4addr = 0;
 288         unsigned short snum;
 289         bool saved_ipv6only;
 290         int addr_type = 0;
 291         int err = 0;
 292
 293         if (addr->sin6_family != AF_INET6)
 294                 return -EAFNOSUPPORT;
 295
 296         addr_type = ipv6_addr_type(&addr->sin6_addr);
 297         if ((addr_type & IPV6_ADDR_MULTICAST) && sk->sk_type == SOCK_STREAM)
 298                 return -EINVAL;
 299
 300         snum = ntohs(addr->sin6_port);
 301         if (!(flags & BIND_NO_CAP_NET_BIND_SERVICE) &&
 302             snum && inet_port_requires_bind_service(net, snum) &&
 303             !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
 304                 return -EACCES;
 305
 306         if (flags & BIND_WITH_LOCK)
 307                 lock_sock(sk);
 308
 309         /* Check these errors (active socket, double bind). */
 310         if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
 311                 err = -EINVAL;
 312                 goto out;
 313         }
 314
 315         /* Check if the address belongs to the host. */
 316         if (addr_type == IPV6_ADDR_MAPPED) {
 317                 struct net_device *dev = NULL;
 318                 int chk_addr_ret;
 319
 320                 /* Binding to v4-mapped address on a v6-only socket
 321                  * makes no sense
 322                  */
 323                 if (ipv6_only_sock(sk)) {
 324                         err = -EINVAL;
 325                         goto out;
 326                 }
 327
 328                 rcu_read_lock();
 329                 if (sk->sk_bound_dev_if) {
 330                         dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
 331                         if (!dev) {
 332                                 err = -ENODEV;
 333                                 goto out_unlock;
 334                         }
 335                 }
 336
 337                 /* Reproduce AF_INET checks to make the bindings consistent */
 338                 v4addr = addr->sin6_addr.s6_addr32[3];
 339                 chk_addr_ret = inet_addr_type_dev_table(net, dev, v4addr);
 340                 rcu_read_unlock();
 341
 342                 if (!inet_addr_valid_or_nonlocal(net, inet, v4addr,
 343                                                  chk_addr_ret)) {
 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_test_bit(BIND_ADDRESS_NO_PORT, sk) ||
 406                       (flags & BIND_FORCE_ADDRESS_NO_PORT))) {
 407                 err = sk->sk_prot->get_port(sk, snum);
 408                 if (err) {
 409                         sk->sk_ipv6only = saved_ipv6only;
 410                         inet_reset_saddr(sk);
 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                                 if (sk->sk_prot->put_port)
 419                                         sk->sk_prot->put_port(sk);
 420                                 goto out;
 421                         }
 422                 }
 423         }
 424
 425         if (addr_type != IPV6_ADDR_ANY)
 426                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
 427         if (snum)
 428                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
 429         inet->inet_sport = htons(inet->inet_num);
 430         inet->inet_dport = 0;
 431         inet->inet_daddr = 0;
 432 out:
 433         if (flags & BIND_WITH_LOCK)
 434                 release_sock(sk);
 435         return err;
 436 out_unlock:
 437         rcu_read_unlock();
 438         goto out;
 439 }
 440
 441 int inet6_bind_sk(struct sock *sk, struct sockaddr *uaddr, int addr_len)
 442 {
 443         u32 flags = BIND_WITH_LOCK;
 444         const struct proto *prot;
 445         int err = 0;
 446
 447         /* IPV6_ADDRFORM can change sk->sk_prot under us. */
 448         prot = READ_ONCE(sk->sk_prot);
 449         /* If the socket has its own bind function then use it. */
 450         if (prot->bind)
 451                 return prot->bind(sk, uaddr, addr_len);
 452
 453         if (addr_len < SIN6_LEN_RFC2133)
 454                 return -EINVAL;
 455
 456         /* BPF prog is run before any checks are done so that if the prog
 457          * changes context in a wrong way it will be caught.
 458          */
 459         err = BPF_CGROUP_RUN_PROG_INET_BIND_LOCK(sk, uaddr,
 460                                                  CGROUP_INET6_BIND, &flags);
 461         if (err)
 462                 return err;
 463
 464         return __inet6_bind(sk, uaddr, addr_len, flags);
 465 }
 466
 467 /* bind for INET6 API */
 468 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 469 {
 470         return inet6_bind_sk(sock->sk, uaddr, addr_len);
 471 }
 472 EXPORT_SYMBOL(inet6_bind);
 473
 474 int inet6_release(struct socket *sock)
 475 {
 476         struct sock *sk = sock->sk;
 477
 478         if (!sk)
 479                 return -EINVAL;
 480
 481         /* Free mc lists */
 482         ipv6_sock_mc_close(sk);
 483
 484         /* Free ac lists */
 485         ipv6_sock_ac_close(sk);
 486
 487         return inet_release(sock);
 488 }
 489 EXPORT_SYMBOL(inet6_release);
 490
 491 void inet6_cleanup_sock(struct sock *sk)
 492 {
 493         struct ipv6_pinfo *np = inet6_sk(sk);
 494         struct sk_buff *skb;
 495         struct ipv6_txoptions *opt;
 496
 497         /* Release rx options */
 498
 499         skb = xchg(&np->pktoptions, NULL);
 500         kfree_skb(skb);
 501
 502         skb = xchg(&np->rxpmtu, NULL);
 503         kfree_skb(skb);
 504
 505         /* Free flowlabels */
 506         fl6_free_socklist(sk);
 507
 508         /* Free tx options */
 509
 510         opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL);
 511         if (opt) {
 512                 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 513                 txopt_put(opt);
 514         }
 515 }
 516 EXPORT_SYMBOL_GPL(inet6_cleanup_sock);
 517
 518 /*
 519  *      This does both peername and sockname.
 520  */
 521 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 522                   int peer)
 523 {
 524         struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
 525         struct sock *sk = sock->sk;
 526         struct inet_sock *inet = inet_sk(sk);
 527         struct ipv6_pinfo *np = inet6_sk(sk);
 528
 529         sin->sin6_family = AF_INET6;
 530         sin->sin6_flowinfo = 0;
 531         sin->sin6_scope_id = 0;
 532         lock_sock(sk);
 533         if (peer) {
 534                 if (!inet->inet_dport ||
 535                     (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
 536                     peer == 1)) {
 537                         release_sock(sk);
 538                         return -ENOTCONN;
 539                 }
 540                 sin->sin6_port = inet->inet_dport;
 541                 sin->sin6_addr = sk->sk_v6_daddr;
 542                 if (np->sndflow)
 543                         sin->sin6_flowinfo = np->flow_label;
 544                 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin,
 545                                        CGROUP_INET6_GETPEERNAME);
 546         } else {
 547                 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
 548                         sin->sin6_addr = np->saddr;
 549                 else
 550                         sin->sin6_addr = sk->sk_v6_rcv_saddr;
 551                 sin->sin6_port = inet->inet_sport;
 552                 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin,
 553                                        CGROUP_INET6_GETSOCKNAME);
 554         }
 555         sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
 556                                                  sk->sk_bound_dev_if);
 557         release_sock(sk);
 558         return sizeof(*sin);
 559 }
 560 EXPORT_SYMBOL(inet6_getname);
 561
 562 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 563 {
 564         void __user *argp = (void __user *)arg;
 565         struct sock *sk = sock->sk;
 566         struct net *net = sock_net(sk);
 567         const struct proto *prot;
 568
 569         switch (cmd) {
 570         case SIOCADDRT:
 571         case SIOCDELRT: {
 572                 struct in6_rtmsg rtmsg;
 573
 574                 if (copy_from_user(&rtmsg, argp, sizeof(rtmsg)))
 575                         return -EFAULT;
 576                 return ipv6_route_ioctl(net, cmd, &rtmsg);
 577         }
 578         case SIOCSIFADDR:
 579                 return addrconf_add_ifaddr(net, argp);
 580         case SIOCDIFADDR:
 581                 return addrconf_del_ifaddr(net, argp);
 582         case SIOCSIFDSTADDR:
 583                 return addrconf_set_dstaddr(net, argp);
 584         default:
 585                 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
 586                 prot = READ_ONCE(sk->sk_prot);
 587                 if (!prot->ioctl)
 588                         return -ENOIOCTLCMD;
 589                 return sk_ioctl(sk, cmd, (void __user *)arg);
 590         }
 591         /*NOTREACHED*/
 592         return 0;
 593 }
 594 EXPORT_SYMBOL(inet6_ioctl);
 595
 596 #ifdef CONFIG_COMPAT
 597 struct compat_in6_rtmsg {
 598         struct in6_addr         rtmsg_dst;
 599         struct in6_addr         rtmsg_src;
 600         struct in6_addr         rtmsg_gateway;
 601         u32                     rtmsg_type;
 602         u16                     rtmsg_dst_len;
 603         u16                     rtmsg_src_len;
 604         u32                     rtmsg_metric;
 605         u32                     rtmsg_info;
 606         u32                     rtmsg_flags;
 607         s32                     rtmsg_ifindex;
 608 };
 609
 610 static int inet6_compat_routing_ioctl(struct sock *sk, unsigned int cmd,
 611                 struct compat_in6_rtmsg __user *ur)
 612 {
 613         struct in6_rtmsg rt;
 614
 615         if (copy_from_user(&rt.rtmsg_dst, &ur->rtmsg_dst,
 616                         3 * sizeof(struct in6_addr)) ||
 617             get_user(rt.rtmsg_type, &ur->rtmsg_type) ||
 618             get_user(rt.rtmsg_dst_len, &ur->rtmsg_dst_len) ||
 619             get_user(rt.rtmsg_src_len, &ur->rtmsg_src_len) ||
 620             get_user(rt.rtmsg_metric, &ur->rtmsg_metric) ||
 621             get_user(rt.rtmsg_info, &ur->rtmsg_info) ||
 622             get_user(rt.rtmsg_flags, &ur->rtmsg_flags) ||
 623             get_user(rt.rtmsg_ifindex, &ur->rtmsg_ifindex))
 624                 return -EFAULT;
 625
 626
 627         return ipv6_route_ioctl(sock_net(sk), cmd, &rt);
 628 }
 629
 630 int inet6_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 631 {
 632         void __user *argp = compat_ptr(arg);
 633         struct sock *sk = sock->sk;
 634
 635         switch (cmd) {
 636         case SIOCADDRT:
 637         case SIOCDELRT:
 638                 return inet6_compat_routing_ioctl(sk, cmd, argp);
 639         default:
 640                 return -ENOIOCTLCMD;
 641         }
 642 }
 643 EXPORT_SYMBOL_GPL(inet6_compat_ioctl);
 644 #endif /* CONFIG_COMPAT */
 645
 646 INDIRECT_CALLABLE_DECLARE(int udpv6_sendmsg(struct sock *, struct msghdr *,
 647                                             size_t));
 648 int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
 649 {
 650         struct sock *sk = sock->sk;
 651         const struct proto *prot;
 652
 653         if (unlikely(inet_send_prepare(sk)))
 654                 return -EAGAIN;
 655
 656         /* IPV6_ADDRFORM can change sk->sk_prot under us. */
 657         prot = READ_ONCE(sk->sk_prot);
 658         return INDIRECT_CALL_2(prot->sendmsg, tcp_sendmsg, udpv6_sendmsg,
 659                                sk, msg, size);
 660 }
 661
 662 INDIRECT_CALLABLE_DECLARE(int udpv6_recvmsg(struct sock *, struct msghdr *,
 663                                             size_t, int, int *));
 664 int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
 665                   int flags)
 666 {
 667         struct sock *sk = sock->sk;
 668         const struct proto *prot;
 669         int addr_len = 0;
 670         int err;
 671
 672         if (likely(!(flags & MSG_ERRQUEUE)))
 673                 sock_rps_record_flow(sk);
 674
 675         /* IPV6_ADDRFORM can change sk->sk_prot under us. */
 676         prot = READ_ONCE(sk->sk_prot);
 677         err = INDIRECT_CALL_2(prot->recvmsg, tcp_recvmsg, udpv6_recvmsg,
 678                               sk, msg, size, flags, &addr_len);
 679         if (err >= 0)
 680                 msg->msg_namelen = addr_len;
 681         return err;
 682 }
 683
 684 const struct proto_ops inet6_stream_ops = {
 685         .family            = PF_INET6,
 686         .owner             = THIS_MODULE,
 687         .release           = inet6_release,
 688         .bind              = inet6_bind,
 689         .connect           = inet_stream_connect,       /* ok           */
 690         .socketpair        = sock_no_socketpair,        /* a do nothing */
 691         .accept            = inet_accept,               /* ok           */
 692         .getname           = inet6_getname,
 693         .poll              = tcp_poll,                  /* ok           */
 694         .ioctl             = inet6_ioctl,               /* must change  */
 695         .gettstamp         = sock_gettstamp,
 696         .listen            = inet_listen,               /* ok           */
 697         .shutdown          = inet_shutdown,             /* ok           */
 698         .setsockopt        = sock_common_setsockopt,    /* ok           */
 699         .getsockopt        = sock_common_getsockopt,    /* ok           */
 700         .sendmsg           = inet6_sendmsg,             /* retpoline's sake */
 701         .recvmsg           = inet6_recvmsg,             /* retpoline's sake */
 702 #ifdef CONFIG_MMU
 703         .mmap              = tcp_mmap,
 704 #endif
 705         .splice_eof        = inet_splice_eof,
 706         .sendmsg_locked    = tcp_sendmsg_locked,
 707         .splice_read       = tcp_splice_read,
 708         .read_sock         = tcp_read_sock,
 709         .read_skb          = tcp_read_skb,
 710         .peek_len          = tcp_peek_len,
 711 #ifdef CONFIG_COMPAT
 712         .compat_ioctl      = inet6_compat_ioctl,
 713 #endif
 714         .set_rcvlowat      = tcp_set_rcvlowat,
 715 };
 716
 717 const struct proto_ops inet6_dgram_ops = {
 718         .family            = PF_INET6,
 719         .owner             = THIS_MODULE,
 720         .release           = inet6_release,
 721         .bind              = inet6_bind,
 722         .connect           = inet_dgram_connect,        /* ok           */
 723         .socketpair        = sock_no_socketpair,        /* a do nothing */
 724         .accept            = sock_no_accept,            /* a do nothing */
 725         .getname           = inet6_getname,
 726         .poll              = udp_poll,                  /* ok           */
 727         .ioctl             = inet6_ioctl,               /* must change  */
 728         .gettstamp         = sock_gettstamp,
 729         .listen            = sock_no_listen,            /* ok           */
 730         .shutdown          = inet_shutdown,             /* ok           */
 731         .setsockopt        = sock_common_setsockopt,    /* ok           */
 732         .getsockopt        = sock_common_getsockopt,    /* ok           */
 733         .sendmsg           = inet6_sendmsg,             /* retpoline's sake */
 734         .recvmsg           = inet6_recvmsg,             /* retpoline's sake */
 735         .read_skb          = udp_read_skb,
 736         .mmap              = sock_no_mmap,
 737         .set_peek_off      = sk_set_peek_off,
 738 #ifdef CONFIG_COMPAT
 739         .compat_ioctl      = inet6_compat_ioctl,
 740 #endif
 741 };
 742
 743 static const struct net_proto_family inet6_family_ops = {
 744         .family = PF_INET6,
 745         .create = inet6_create,
 746         .owner  = THIS_MODULE,
 747 };
 748
 749 int inet6_register_protosw(struct inet_protosw *p)
 750 {
 751         struct list_head *lh;
 752         struct inet_protosw *answer;
 753         struct list_head *last_perm;
 754         int protocol = p->protocol;
 755         int ret;
 756
 757         spin_lock_bh(&inetsw6_lock);
 758
 759         ret = -EINVAL;
 760         if (p->type >= SOCK_MAX)
 761                 goto out_illegal;
 762
 763         /* If we are trying to override a permanent protocol, bail. */
 764         answer = NULL;
 765         ret = -EPERM;
 766         last_perm = &inetsw6[p->type];
 767         list_for_each(lh, &inetsw6[p->type]) {
 768                 answer = list_entry(lh, struct inet_protosw, list);
 769
 770                 /* Check only the non-wild match. */
 771                 if (INET_PROTOSW_PERMANENT & answer->flags) {
 772                         if (protocol == answer->protocol)
 773                                 break;
 774                         last_perm = lh;
 775                 }
 776
 777                 answer = NULL;
 778         }
 779         if (answer)
 780                 goto out_permanent;
 781
 782         /* Add the new entry after the last permanent entry if any, so that
 783          * the new entry does not override a permanent entry when matched with
 784          * a wild-card protocol. But it is allowed to override any existing
 785          * non-permanent entry.  This means that when we remove this entry, the
 786          * system automatically returns to the old behavior.
 787          */
 788         list_add_rcu(&p->list, last_perm);
 789         ret = 0;
 790 out:
 791         spin_unlock_bh(&inetsw6_lock);
 792         return ret;
 793
 794 out_permanent:
 795         pr_err("Attempt to override permanent protocol %d\n", protocol);
 796         goto out;
 797
 798 out_illegal:
 799         pr_err("Ignoring attempt to register invalid socket type %d\n",
 800                p->type);
 801         goto out;
 802 }
 803 EXPORT_SYMBOL(inet6_register_protosw);
 804
 805 void
 806 inet6_unregister_protosw(struct inet_protosw *p)
 807 {
 808         if (INET_PROTOSW_PERMANENT & p->flags) {
 809                 pr_err("Attempt to unregister permanent protocol %d\n",
 810                        p->protocol);
 811         } else {
 812                 spin_lock_bh(&inetsw6_lock);
 813                 list_del_rcu(&p->list);
 814                 spin_unlock_bh(&inetsw6_lock);
 815
 816                 synchronize_net();
 817         }
 818 }
 819 EXPORT_SYMBOL(inet6_unregister_protosw);
 820
 821 int inet6_sk_rebuild_header(struct sock *sk)
 822 {
 823         struct ipv6_pinfo *np = inet6_sk(sk);
 824         struct dst_entry *dst;
 825
 826         dst = __sk_dst_check(sk, np->dst_cookie);
 827
 828         if (!dst) {
 829                 struct inet_sock *inet = inet_sk(sk);
 830                 struct in6_addr *final_p, final;
 831                 struct flowi6 fl6;
 832
 833                 memset(&fl6, 0, sizeof(fl6));
 834                 fl6.flowi6_proto = sk->sk_protocol;
 835                 fl6.daddr = sk->sk_v6_daddr;
 836                 fl6.saddr = np->saddr;
 837                 fl6.flowlabel = np->flow_label;
 838                 fl6.flowi6_oif = sk->sk_bound_dev_if;
 839                 fl6.flowi6_mark = sk->sk_mark;
 840                 fl6.fl6_dport = inet->inet_dport;
 841                 fl6.fl6_sport = inet->inet_sport;
 842                 fl6.flowi6_uid = sk->sk_uid;
 843                 security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6));
 844
 845                 rcu_read_lock();
 846                 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt),
 847                                          &final);
 848                 rcu_read_unlock();
 849
 850                 dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
 851                 if (IS_ERR(dst)) {
 852                         sk->sk_route_caps = 0;
 853                         WRITE_ONCE(sk->sk_err_soft, -PTR_ERR(dst));
 854                         return PTR_ERR(dst);
 855                 }
 856
 857                 ip6_dst_store(sk, dst, NULL, NULL);
 858         }
 859
 860         return 0;
 861 }
 862 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
 863
 864 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
 865                        const struct inet6_skb_parm *opt)
 866 {
 867         const struct ipv6_pinfo *np = inet6_sk(sk);
 868
 869         if (np->rxopt.all) {
 870                 if (((opt->flags & IP6SKB_HOPBYHOP) &&
 871                      (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) ||
 872                     (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) &&
 873                      np->rxopt.bits.rxflow) ||
 874                     (opt->srcrt && (np->rxopt.bits.srcrt ||
 875                      np->rxopt.bits.osrcrt)) ||
 876                     ((opt->dst1 || opt->dst0) &&
 877                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
 878                         return true;
 879         }
 880         return false;
 881 }
 882 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
 883
 884 static struct packet_type ipv6_packet_type __read_mostly = {
 885         .type = cpu_to_be16(ETH_P_IPV6),
 886         .func = ipv6_rcv,
 887         .list_func = ipv6_list_rcv,
 888 };
 889
 890 static int __init ipv6_packet_init(void)
 891 {
 892         dev_add_pack(&ipv6_packet_type);
 893         return 0;
 894 }
 895
 896 static void ipv6_packet_cleanup(void)
 897 {
 898         dev_remove_pack(&ipv6_packet_type);
 899 }
 900
 901 static int __net_init ipv6_init_mibs(struct net *net)
 902 {
 903         int i;
 904
 905         net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib);
 906         if (!net->mib.udp_stats_in6)
 907                 return -ENOMEM;
 908         net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib);
 909         if (!net->mib.udplite_stats_in6)
 910                 goto err_udplite_mib;
 911         net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib);
 912         if (!net->mib.ipv6_statistics)
 913                 goto err_ip_mib;
 914
 915         for_each_possible_cpu(i) {
 916                 struct ipstats_mib *af_inet6_stats;
 917                 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i);
 918                 u64_stats_init(&af_inet6_stats->syncp);
 919         }
 920
 921
 922         net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib);
 923         if (!net->mib.icmpv6_statistics)
 924                 goto err_icmp_mib;
 925         net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
 926                                                 GFP_KERNEL);
 927         if (!net->mib.icmpv6msg_statistics)
 928                 goto err_icmpmsg_mib;
 929         return 0;
 930
 931 err_icmpmsg_mib:
 932         free_percpu(net->mib.icmpv6_statistics);
 933 err_icmp_mib:
 934         free_percpu(net->mib.ipv6_statistics);
 935 err_ip_mib:
 936         free_percpu(net->mib.udplite_stats_in6);
 937 err_udplite_mib:
 938         free_percpu(net->mib.udp_stats_in6);
 939         return -ENOMEM;
 940 }
 941
 942 static void ipv6_cleanup_mibs(struct net *net)
 943 {
 944         free_percpu(net->mib.udp_stats_in6);
 945         free_percpu(net->mib.udplite_stats_in6);
 946         free_percpu(net->mib.ipv6_statistics);
 947         free_percpu(net->mib.icmpv6_statistics);
 948         kfree(net->mib.icmpv6msg_statistics);
 949 }
 950
 951 static int __net_init inet6_net_init(struct net *net)
 952 {
 953         int err = 0;
 954
 955         net->ipv6.sysctl.bindv6only = 0;
 956         net->ipv6.sysctl.icmpv6_time = 1*HZ;
 957         net->ipv6.sysctl.icmpv6_echo_ignore_all = 0;
 958         net->ipv6.sysctl.icmpv6_echo_ignore_multicast = 0;
 959         net->ipv6.sysctl.icmpv6_echo_ignore_anycast = 0;
 960         net->ipv6.sysctl.icmpv6_error_anycast_as_unicast = 0;
 961
 962         /* By default, rate limit error messages.
 963          * Except for pmtu discovery, it would break it.
 964          * proc_do_large_bitmap needs pointer to the bitmap.
 965          */
 966         bitmap_set(net->ipv6.sysctl.icmpv6_ratemask, 0, ICMPV6_ERRMSG_MAX + 1);
 967         bitmap_clear(net->ipv6.sysctl.icmpv6_ratemask, ICMPV6_PKT_TOOBIG, 1);
 968         net->ipv6.sysctl.icmpv6_ratemask_ptr = net->ipv6.sysctl.icmpv6_ratemask;
 969
 970         net->ipv6.sysctl.flowlabel_consistency = 1;
 971         net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS;
 972         net->ipv6.sysctl.idgen_retries = 3;
 973         net->ipv6.sysctl.idgen_delay = 1 * HZ;
 974         net->ipv6.sysctl.flowlabel_state_ranges = 0;
 975         net->ipv6.sysctl.max_dst_opts_cnt = IP6_DEFAULT_MAX_DST_OPTS_CNT;
 976         net->ipv6.sysctl.max_hbh_opts_cnt = IP6_DEFAULT_MAX_HBH_OPTS_CNT;
 977         net->ipv6.sysctl.max_dst_opts_len = IP6_DEFAULT_MAX_DST_OPTS_LEN;
 978         net->ipv6.sysctl.max_hbh_opts_len = IP6_DEFAULT_MAX_HBH_OPTS_LEN;
 979         net->ipv6.sysctl.fib_notify_on_flag_change = 0;
 980         atomic_set(&net->ipv6.fib6_sernum, 1);
 981
 982         net->ipv6.sysctl.ioam6_id = IOAM6_DEFAULT_ID;
 983         net->ipv6.sysctl.ioam6_id_wide = IOAM6_DEFAULT_ID_WIDE;
 984
 985         err = ipv6_init_mibs(net);
 986         if (err)
 987                 return err;
 988 #ifdef CONFIG_PROC_FS
 989         err = udp6_proc_init(net);
 990         if (err)
 991                 goto out;
 992         err = tcp6_proc_init(net);
 993         if (err)
 994                 goto proc_tcp6_fail;
 995         err = ac6_proc_init(net);
 996         if (err)
 997                 goto proc_ac6_fail;
 998 #endif
 999         return err;
1000
1001 #ifdef CONFIG_PROC_FS
1002 proc_ac6_fail:
1003         tcp6_proc_exit(net);
1004 proc_tcp6_fail:
1005         udp6_proc_exit(net);
1006 out:
1007         ipv6_cleanup_mibs(net);
1008         return err;
1009 #endif
1010 }
1011
1012 static void __net_exit inet6_net_exit(struct net *net)
1013 {
1014 #ifdef CONFIG_PROC_FS
1015         udp6_proc_exit(net);
1016         tcp6_proc_exit(net);
1017         ac6_proc_exit(net);
1018 #endif
1019         ipv6_cleanup_mibs(net);
1020 }
1021
1022 static struct pernet_operations inet6_net_ops = {
1023         .init = inet6_net_init,
1024         .exit = inet6_net_exit,
1025 };
1026
1027 static int ipv6_route_input(struct sk_buff *skb)
1028 {
1029         ip6_route_input(skb);
1030         return skb_dst(skb)->error;
1031 }
1032
1033 static const struct ipv6_stub ipv6_stub_impl = {
1034         .ipv6_sock_mc_join = ipv6_sock_mc_join,
1035         .ipv6_sock_mc_drop = ipv6_sock_mc_drop,
1036         .ipv6_dst_lookup_flow = ip6_dst_lookup_flow,
1037         .ipv6_route_input  = ipv6_route_input,
1038         .fib6_get_table    = fib6_get_table,
1039         .fib6_table_lookup = fib6_table_lookup,
1040         .fib6_lookup       = fib6_lookup,
1041         .fib6_select_path  = fib6_select_path,
1042         .ip6_mtu_from_fib6 = ip6_mtu_from_fib6,
1043         .fib6_nh_init      = fib6_nh_init,
1044         .fib6_nh_release   = fib6_nh_release,
1045         .fib6_nh_release_dsts = fib6_nh_release_dsts,
1046         .fib6_update_sernum = fib6_update_sernum_stub,
1047         .fib6_rt_update    = fib6_rt_update,
1048         .ip6_del_rt        = ip6_del_rt,
1049         .udpv6_encap_enable = udpv6_encap_enable,
1050         .ndisc_send_na = ndisc_send_na,
1051 #if IS_ENABLED(CONFIG_XFRM)
1052         .xfrm6_local_rxpmtu = xfrm6_local_rxpmtu,
1053         .xfrm6_udp_encap_rcv = xfrm6_udp_encap_rcv,
1054         .xfrm6_rcv_encap = xfrm6_rcv_encap,
1055 #endif
1056         .nd_tbl = &nd_tbl,
1057         .ipv6_fragment = ip6_fragment,
1058         .ipv6_dev_find = ipv6_dev_find,
1059 };
1060
1061 static const struct ipv6_bpf_stub ipv6_bpf_stub_impl = {
1062         .inet6_bind = __inet6_bind,
1063         .udp6_lib_lookup = __udp6_lib_lookup,
1064         .ipv6_setsockopt = do_ipv6_setsockopt,
1065         .ipv6_getsockopt = do_ipv6_getsockopt,
1066 };
1067
1068 static int __init inet6_init(void)
1069 {
1070         struct list_head *r;
1071         int err = 0;
1072
1073         sock_skb_cb_check_size(sizeof(struct inet6_skb_parm));
1074
1075         /* Register the socket-side information for inet6_create.  */
1076         for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
1077                 INIT_LIST_HEAD(r);
1078
1079         raw_hashinfo_init(&raw_v6_hashinfo);
1080
1081         if (disable_ipv6_mod) {
1082                 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
1083                 goto out;
1084         }
1085
1086         err = proto_register(&tcpv6_prot, 1);
1087         if (err)
1088                 goto out;
1089
1090         err = proto_register(&udpv6_prot, 1);
1091         if (err)
1092                 goto out_unregister_tcp_proto;
1093
1094         err = proto_register(&udplitev6_prot, 1);
1095         if (err)
1096                 goto out_unregister_udp_proto;
1097
1098         err = proto_register(&rawv6_prot, 1);
1099         if (err)
1100                 goto out_unregister_udplite_proto;
1101
1102         err = proto_register(&pingv6_prot, 1);
1103         if (err)
1104                 goto out_unregister_raw_proto;
1105
1106         /* We MUST register RAW sockets before we create the ICMP6,
1107          * IGMP6, or NDISC control sockets.
1108          */
1109         err = rawv6_init();
1110         if (err)
1111                 goto out_unregister_ping_proto;
1112
1113         /* Register the family here so that the init calls below will
1114          * be able to create sockets. (?? is this dangerous ??)
1115          */
1116         err = sock_register(&inet6_family_ops);
1117         if (err)
1118                 goto out_sock_register_fail;
1119
1120         /*
1121          *      ipngwg API draft makes clear that the correct semantics
1122          *      for TCP and UDP is to consider one TCP and UDP instance
1123          *      in a host available by both INET and INET6 APIs and
1124          *      able to communicate via both network protocols.
1125          */
1126
1127         err = register_pernet_subsys(&inet6_net_ops);
1128         if (err)
1129                 goto register_pernet_fail;
1130         err = ip6_mr_init();
1131         if (err)
1132                 goto ipmr_fail;
1133         err = icmpv6_init();
1134         if (err)
1135                 goto icmp_fail;
1136         err = ndisc_init();
1137         if (err)
1138                 goto ndisc_fail;
1139         err = igmp6_init();
1140         if (err)
1141                 goto igmp_fail;
1142
1143         err = ipv6_netfilter_init();
1144         if (err)
1145                 goto netfilter_fail;
1146         /* Create /proc/foo6 entries. */
1147 #ifdef CONFIG_PROC_FS
1148         err = -ENOMEM;
1149         if (raw6_proc_init())
1150                 goto proc_raw6_fail;
1151         if (udplite6_proc_init())
1152                 goto proc_udplite6_fail;
1153         if (ipv6_misc_proc_init())
1154                 goto proc_misc6_fail;
1155         if (if6_proc_init())
1156                 goto proc_if6_fail;
1157 #endif
1158         err = ip6_route_init();
1159         if (err)
1160                 goto ip6_route_fail;
1161         err = ndisc_late_init();
1162         if (err)
1163                 goto ndisc_late_fail;
1164         err = ip6_flowlabel_init();
1165         if (err)
1166                 goto ip6_flowlabel_fail;
1167         err = ipv6_anycast_init();
1168         if (err)
1169                 goto ipv6_anycast_fail;
1170         err = addrconf_init();
1171         if (err)
1172                 goto addrconf_fail;
1173
1174         /* Init v6 extension headers. */
1175         err = ipv6_exthdrs_init();
1176         if (err)
1177                 goto ipv6_exthdrs_fail;
1178
1179         err = ipv6_frag_init();
1180         if (err)
1181                 goto ipv6_frag_fail;
1182
1183         /* Init v6 transport protocols. */
1184         err = udpv6_init();
1185         if (err)
1186                 goto udpv6_fail;
1187
1188         err = udplitev6_init();
1189         if (err)
1190                 goto udplitev6_fail;
1191
1192         err = udpv6_offload_init();
1193         if (err)
1194                 goto udpv6_offload_fail;
1195
1196         err = tcpv6_init();
1197         if (err)
1198                 goto tcpv6_fail;
1199
1200         err = ipv6_packet_init();
1201         if (err)
1202                 goto ipv6_packet_fail;
1203
1204         err = pingv6_init();
1205         if (err)
1206                 goto pingv6_fail;
1207
1208         err = calipso_init();
1209         if (err)
1210                 goto calipso_fail;
1211
1212         err = seg6_init();
1213         if (err)
1214                 goto seg6_fail;
1215
1216         err = rpl_init();
1217         if (err)
1218                 goto rpl_fail;
1219
1220         err = ioam6_init();
1221         if (err)
1222                 goto ioam6_fail;
1223
1224         err = igmp6_late_init();
1225         if (err)
1226                 goto igmp6_late_err;
1227
1228 #ifdef CONFIG_SYSCTL
1229         err = ipv6_sysctl_register();
1230         if (err)
1231                 goto sysctl_fail;
1232 #endif
1233
1234         /* ensure that ipv6 stubs are visible only after ipv6 is ready */
1235         wmb();
1236         ipv6_stub = &ipv6_stub_impl;
1237         ipv6_bpf_stub = &ipv6_bpf_stub_impl;
1238 out:
1239         return err;
1240
1241 #ifdef CONFIG_SYSCTL
1242 sysctl_fail:
1243         igmp6_late_cleanup();
1244 #endif
1245 igmp6_late_err:
1246         ioam6_exit();
1247 ioam6_fail:
1248         rpl_exit();
1249 rpl_fail:
1250         seg6_exit();
1251 seg6_fail:
1252         calipso_exit();
1253 calipso_fail:
1254         pingv6_exit();
1255 pingv6_fail:
1256         ipv6_packet_cleanup();
1257 ipv6_packet_fail:
1258         tcpv6_exit();
1259 tcpv6_fail:
1260         udpv6_offload_exit();
1261 udpv6_offload_fail:
1262         udplitev6_exit();
1263 udplitev6_fail:
1264         udpv6_exit();
1265 udpv6_fail:
1266         ipv6_frag_exit();
1267 ipv6_frag_fail:
1268         ipv6_exthdrs_exit();
1269 ipv6_exthdrs_fail:
1270         addrconf_cleanup();
1271 addrconf_fail:
1272         ipv6_anycast_cleanup();
1273 ipv6_anycast_fail:
1274         ip6_flowlabel_cleanup();
1275 ip6_flowlabel_fail:
1276         ndisc_late_cleanup();
1277 ndisc_late_fail:
1278         ip6_route_cleanup();
1279 ip6_route_fail:
1280 #ifdef CONFIG_PROC_FS
1281         if6_proc_exit();
1282 proc_if6_fail:
1283         ipv6_misc_proc_exit();
1284 proc_misc6_fail:
1285         udplite6_proc_exit();
1286 proc_udplite6_fail:
1287         raw6_proc_exit();
1288 proc_raw6_fail:
1289 #endif
1290         ipv6_netfilter_fini();
1291 netfilter_fail:
1292         igmp6_cleanup();
1293 igmp_fail:
1294         ndisc_cleanup();
1295 ndisc_fail:
1296         icmpv6_cleanup();
1297 icmp_fail:
1298         ip6_mr_cleanup();
1299 ipmr_fail:
1300         unregister_pernet_subsys(&inet6_net_ops);
1301 register_pernet_fail:
1302         sock_unregister(PF_INET6);
1303         rtnl_unregister_all(PF_INET6);
1304 out_sock_register_fail:
1305         rawv6_exit();
1306 out_unregister_ping_proto:
1307         proto_unregister(&pingv6_prot);
1308 out_unregister_raw_proto:
1309         proto_unregister(&rawv6_prot);
1310 out_unregister_udplite_proto:
1311         proto_unregister(&udplitev6_prot);
1312 out_unregister_udp_proto:
1313         proto_unregister(&udpv6_prot);
1314 out_unregister_tcp_proto:
1315         proto_unregister(&tcpv6_prot);
1316         goto out;
1317 }
1318 module_init(inet6_init);
1319
1320 MODULE_ALIAS_NETPROTO(PF_INET6);