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         inet = inet_sk(sk);
 203         inet_assign_bit(IS_ICSK, sk, INET_PROTOSW_ICSK & answer_flags);
 204
 205         if (SOCK_RAW == sock->type) {
 206                 inet->inet_num = protocol;
 207                 if (IPPROTO_RAW == protocol)
 208                         inet_set_bit(HDRINCL, sk);
 209         }
 210
 211         sk->sk_destruct         = inet6_sock_destruct;
 212         sk->sk_family           = PF_INET6;
 213         sk->sk_protocol         = protocol;
 214
 215         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
 216
 217         inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
 218         np->hop_limit   = -1;
 219         np->mcast_hops  = IPV6_DEFAULT_MCASTHOPS;
 220         np->mc_loop     = 1;
 221         np->mc_all      = 1;
 222         np->pmtudisc    = IPV6_PMTUDISC_WANT;
 223         np->repflow     = net->ipv6.sysctl.flowlabel_reflect & FLOWLABEL_REFLECT_ESTABLISHED;
 224         sk->sk_ipv6only = net->ipv6.sysctl.bindv6only;
 225         sk->sk_txrehash = READ_ONCE(net->core.sysctl_txrehash);
 226
 227         /* Init the ipv4 part of the socket since we can have sockets
 228          * using v6 API for ipv4.
 229          */
 230         inet->uc_ttl    = -1;
 231
 232         inet_set_bit(MC_LOOP, sk);
 233         inet->mc_ttl    = 1;
 234         inet->mc_index  = 0;
 235         RCU_INIT_POINTER(inet->mc_list, NULL);
 236         inet->rcv_tos   = 0;
 237
 238         if (READ_ONCE(net->ipv4.sysctl_ip_no_pmtu_disc))
 239                 inet->pmtudisc = IP_PMTUDISC_DONT;
 240         else
 241                 inet->pmtudisc = IP_PMTUDISC_WANT;
 242
 243         if (inet->inet_num) {
 244                 /* It assumes that any protocol which allows
 245                  * the user to assign a number at socket
 246                  * creation time automatically shares.
 247                  */
 248                 inet->inet_sport = htons(inet->inet_num);
 249                 err = sk->sk_prot->hash(sk);
 250                 if (err) {
 251                         sk_common_release(sk);
 252                         goto out;
 253                 }
 254         }
 255         if (sk->sk_prot->init) {
 256                 err = sk->sk_prot->init(sk);
 257                 if (err) {
 258                         sk_common_release(sk);
 259                         goto out;
 260                 }
 261         }
 262
 263         if (!kern) {
 264                 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
 265                 if (err) {
 266                         sk_common_release(sk);
 267                         goto out;
 268                 }
 269         }
 270 out:
 271         return err;
 272 out_rcu_unlock:
 273         rcu_read_unlock();
 274         goto out;
 275 }
 276
 277 static int __inet6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
 278                         u32 flags)
 279 {
 280         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
 281         struct inet_sock *inet = inet_sk(sk);
 282         struct ipv6_pinfo *np = inet6_sk(sk);
 283         struct net *net = sock_net(sk);
 284         __be32 v4addr = 0;
 285         unsigned short snum;
 286         bool saved_ipv6only;
 287         int addr_type = 0;
 288         int err = 0;
 289
 290         if (addr->sin6_family != AF_INET6)
 291                 return -EAFNOSUPPORT;
 292
 293         addr_type = ipv6_addr_type(&addr->sin6_addr);
 294         if ((addr_type & IPV6_ADDR_MULTICAST) && sk->sk_type == SOCK_STREAM)
 295                 return -EINVAL;
 296
 297         snum = ntohs(addr->sin6_port);
 298         if (!(flags & BIND_NO_CAP_NET_BIND_SERVICE) &&
 299             snum && inet_port_requires_bind_service(net, snum) &&
 300             !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
 301                 return -EACCES;
 302
 303         if (flags & BIND_WITH_LOCK)
 304                 lock_sock(sk);
 305
 306         /* Check these errors (active socket, double bind). */
 307         if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
 308                 err = -EINVAL;
 309                 goto out;
 310         }
 311
 312         /* Check if the address belongs to the host. */
 313         if (addr_type == IPV6_ADDR_MAPPED) {
 314                 struct net_device *dev = NULL;
 315                 int chk_addr_ret;
 316
 317                 /* Binding to v4-mapped address on a v6-only socket
 318                  * makes no sense
 319                  */
 320                 if (ipv6_only_sock(sk)) {
 321                         err = -EINVAL;
 322                         goto out;
 323                 }
 324
 325                 rcu_read_lock();
 326                 if (sk->sk_bound_dev_if) {
 327                         dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
 328                         if (!dev) {
 329                                 err = -ENODEV;
 330                                 goto out_unlock;
 331                         }
 332                 }
 333
 334                 /* Reproduce AF_INET checks to make the bindings consistent */
 335                 v4addr = addr->sin6_addr.s6_addr32[3];
 336                 chk_addr_ret = inet_addr_type_dev_table(net, dev, v4addr);
 337                 rcu_read_unlock();
 338
 339                 if (!inet_addr_valid_or_nonlocal(net, inet, v4addr,
 340                                                  chk_addr_ret)) {
 341                         err = -EADDRNOTAVAIL;
 342                         goto out;
 343                 }
 344         } else {
 345                 if (addr_type != IPV6_ADDR_ANY) {
 346                         struct net_device *dev = NULL;
 347
 348                         rcu_read_lock();
 349                         if (__ipv6_addr_needs_scope_id(addr_type)) {
 350                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 351                                     addr->sin6_scope_id) {
 352                                         /* Override any existing binding, if another one
 353                                          * is supplied by user.
 354                                          */
 355                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
 356                                 }
 357
 358                                 /* Binding to link-local address requires an interface */
 359                                 if (!sk->sk_bound_dev_if) {
 360                                         err = -EINVAL;
 361                                         goto out_unlock;
 362                                 }
 363                         }
 364
 365                         if (sk->sk_bound_dev_if) {
 366                                 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
 367                                 if (!dev) {
 368                                         err = -ENODEV;
 369                                         goto out_unlock;
 370                                 }
 371                         }
 372
 373                         /* ipv4 addr of the socket is invalid.  Only the
 374                          * unspecified and mapped address have a v4 equivalent.
 375                          */
 376                         v4addr = LOOPBACK4_IPV6;
 377                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
 378                                 if (!ipv6_can_nonlocal_bind(net, inet) &&
 379                                     !ipv6_chk_addr(net, &addr->sin6_addr,
 380                                                    dev, 0)) {
 381                                         err = -EADDRNOTAVAIL;
 382                                         goto out_unlock;
 383                                 }
 384                         }
 385                         rcu_read_unlock();
 386                 }
 387         }
 388
 389         inet->inet_rcv_saddr = v4addr;
 390         inet->inet_saddr = v4addr;
 391
 392         sk->sk_v6_rcv_saddr = addr->sin6_addr;
 393
 394         if (!(addr_type & IPV6_ADDR_MULTICAST))
 395                 np->saddr = addr->sin6_addr;
 396
 397         saved_ipv6only = sk->sk_ipv6only;
 398         if (addr_type != IPV6_ADDR_ANY && addr_type != IPV6_ADDR_MAPPED)
 399                 sk->sk_ipv6only = 1;
 400
 401         /* Make sure we are allowed to bind here. */
 402         if (snum || !(inet_test_bit(BIND_ADDRESS_NO_PORT, sk) ||
 403                       (flags & BIND_FORCE_ADDRESS_NO_PORT))) {
 404                 err = sk->sk_prot->get_port(sk, snum);
 405                 if (err) {
 406                         sk->sk_ipv6only = saved_ipv6only;
 407                         inet_reset_saddr(sk);
 408                         goto out;
 409                 }
 410                 if (!(flags & BIND_FROM_BPF)) {
 411                         err = BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk);
 412                         if (err) {
 413                                 sk->sk_ipv6only = saved_ipv6only;
 414                                 inet_reset_saddr(sk);
 415                                 if (sk->sk_prot->put_port)
 416                                         sk->sk_prot->put_port(sk);
 417                                 goto out;
 418                         }
 419                 }
 420         }
 421
 422         if (addr_type != IPV6_ADDR_ANY)
 423                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
 424         if (snum)
 425                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
 426         inet->inet_sport = htons(inet->inet_num);
 427         inet->inet_dport = 0;
 428         inet->inet_daddr = 0;
 429 out:
 430         if (flags & BIND_WITH_LOCK)
 431                 release_sock(sk);
 432         return err;
 433 out_unlock:
 434         rcu_read_unlock();
 435         goto out;
 436 }
 437
 438 int inet6_bind_sk(struct sock *sk, struct sockaddr *uaddr, int addr_len)
 439 {
 440         u32 flags = BIND_WITH_LOCK;
 441         const struct proto *prot;
 442         int err = 0;
 443
 444         /* IPV6_ADDRFORM can change sk->sk_prot under us. */
 445         prot = READ_ONCE(sk->sk_prot);
 446         /* If the socket has its own bind function then use it. */
 447         if (prot->bind)
 448                 return prot->bind(sk, uaddr, addr_len);
 449
 450         if (addr_len < SIN6_LEN_RFC2133)
 451                 return -EINVAL;
 452
 453         /* BPF prog is run before any checks are done so that if the prog
 454          * changes context in a wrong way it will be caught.
 455          */
 456         err = BPF_CGROUP_RUN_PROG_INET_BIND_LOCK(sk, uaddr,
 457                                                  CGROUP_INET6_BIND, &flags);
 458         if (err)
 459                 return err;
 460
 461         return __inet6_bind(sk, uaddr, addr_len, flags);
 462 }
 463
 464 /* bind for INET6 API */
 465 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 466 {
 467         return inet6_bind_sk(sock->sk, uaddr, addr_len);
 468 }
 469 EXPORT_SYMBOL(inet6_bind);
 470
 471 int inet6_release(struct socket *sock)
 472 {
 473         struct sock *sk = sock->sk;
 474
 475         if (!sk)
 476                 return -EINVAL;
 477
 478         /* Free mc lists */
 479         ipv6_sock_mc_close(sk);
 480
 481         /* Free ac lists */
 482         ipv6_sock_ac_close(sk);
 483
 484         return inet_release(sock);
 485 }
 486 EXPORT_SYMBOL(inet6_release);
 487
 488 void inet6_cleanup_sock(struct sock *sk)
 489 {
 490         struct ipv6_pinfo *np = inet6_sk(sk);
 491         struct sk_buff *skb;
 492         struct ipv6_txoptions *opt;
 493
 494         /* Release rx options */
 495
 496         skb = xchg(&np->pktoptions, NULL);
 497         kfree_skb(skb);
 498
 499         skb = xchg(&np->rxpmtu, NULL);
 500         kfree_skb(skb);
 501
 502         /* Free flowlabels */
 503         fl6_free_socklist(sk);
 504
 505         /* Free tx options */
 506
 507         opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL);
 508         if (opt) {
 509                 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 510                 txopt_put(opt);
 511         }
 512 }
 513 EXPORT_SYMBOL_GPL(inet6_cleanup_sock);
 514
 515 /*
 516  *      This does both peername and sockname.
 517  */
 518 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 519                   int peer)
 520 {
 521         struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
 522         struct sock *sk = sock->sk;
 523         struct inet_sock *inet = inet_sk(sk);
 524         struct ipv6_pinfo *np = inet6_sk(sk);
 525
 526         sin->sin6_family = AF_INET6;
 527         sin->sin6_flowinfo = 0;
 528         sin->sin6_scope_id = 0;
 529         lock_sock(sk);
 530         if (peer) {
 531                 if (!inet->inet_dport ||
 532                     (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
 533                     peer == 1)) {
 534                         release_sock(sk);
 535                         return -ENOTCONN;
 536                 }
 537                 sin->sin6_port = inet->inet_dport;
 538                 sin->sin6_addr = sk->sk_v6_daddr;
 539                 if (np->sndflow)
 540                         sin->sin6_flowinfo = np->flow_label;
 541                 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin,
 542                                        CGROUP_INET6_GETPEERNAME);
 543         } else {
 544                 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
 545                         sin->sin6_addr = np->saddr;
 546                 else
 547                         sin->sin6_addr = sk->sk_v6_rcv_saddr;
 548                 sin->sin6_port = inet->inet_sport;
 549                 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin,
 550                                        CGROUP_INET6_GETSOCKNAME);
 551         }
 552         sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
 553                                                  sk->sk_bound_dev_if);
 554         release_sock(sk);
 555         return sizeof(*sin);
 556 }
 557 EXPORT_SYMBOL(inet6_getname);
 558
 559 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 560 {
 561         void __user *argp = (void __user *)arg;
 562         struct sock *sk = sock->sk;
 563         struct net *net = sock_net(sk);
 564         const struct proto *prot;
 565
 566         switch (cmd) {
 567         case SIOCADDRT:
 568         case SIOCDELRT: {
 569                 struct in6_rtmsg rtmsg;
 570
 571                 if (copy_from_user(&rtmsg, argp, sizeof(rtmsg)))
 572                         return -EFAULT;
 573                 return ipv6_route_ioctl(net, cmd, &rtmsg);
 574         }
 575         case SIOCSIFADDR:
 576                 return addrconf_add_ifaddr(net, argp);
 577         case SIOCDIFADDR:
 578                 return addrconf_del_ifaddr(net, argp);
 579         case SIOCSIFDSTADDR:
 580                 return addrconf_set_dstaddr(net, argp);
 581         default:
 582                 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
 583                 prot = READ_ONCE(sk->sk_prot);
 584                 if (!prot->ioctl)
 585                         return -ENOIOCTLCMD;
 586                 return sk_ioctl(sk, cmd, (void __user *)arg);
 587         }
 588         /*NOTREACHED*/
 589         return 0;
 590 }
 591 EXPORT_SYMBOL(inet6_ioctl);
 592
 593 #ifdef CONFIG_COMPAT
 594 struct compat_in6_rtmsg {
 595         struct in6_addr         rtmsg_dst;
 596         struct in6_addr         rtmsg_src;
 597         struct in6_addr         rtmsg_gateway;
 598         u32                     rtmsg_type;
 599         u16                     rtmsg_dst_len;
 600         u16                     rtmsg_src_len;
 601         u32                     rtmsg_metric;
 602         u32                     rtmsg_info;
 603         u32                     rtmsg_flags;
 604         s32                     rtmsg_ifindex;
 605 };
 606
 607 static int inet6_compat_routing_ioctl(struct sock *sk, unsigned int cmd,
 608                 struct compat_in6_rtmsg __user *ur)
 609 {
 610         struct in6_rtmsg rt;
 611
 612         if (copy_from_user(&rt.rtmsg_dst, &ur->rtmsg_dst,
 613                         3 * sizeof(struct in6_addr)) ||
 614             get_user(rt.rtmsg_type, &ur->rtmsg_type) ||
 615             get_user(rt.rtmsg_dst_len, &ur->rtmsg_dst_len) ||
 616             get_user(rt.rtmsg_src_len, &ur->rtmsg_src_len) ||
 617             get_user(rt.rtmsg_metric, &ur->rtmsg_metric) ||
 618             get_user(rt.rtmsg_info, &ur->rtmsg_info) ||
 619             get_user(rt.rtmsg_flags, &ur->rtmsg_flags) ||
 620             get_user(rt.rtmsg_ifindex, &ur->rtmsg_ifindex))
 621                 return -EFAULT;
 622
 623
 624         return ipv6_route_ioctl(sock_net(sk), cmd, &rt);
 625 }
 626
 627 int inet6_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 628 {
 629         void __user *argp = compat_ptr(arg);
 630         struct sock *sk = sock->sk;
 631
 632         switch (cmd) {
 633         case SIOCADDRT:
 634         case SIOCDELRT:
 635                 return inet6_compat_routing_ioctl(sk, cmd, argp);
 636         default:
 637                 return -ENOIOCTLCMD;
 638         }
 639 }
 640 EXPORT_SYMBOL_GPL(inet6_compat_ioctl);
 641 #endif /* CONFIG_COMPAT */
 642
 643 INDIRECT_CALLABLE_DECLARE(int udpv6_sendmsg(struct sock *, struct msghdr *,
 644                                             size_t));
 645 int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
 646 {
 647         struct sock *sk = sock->sk;
 648         const struct proto *prot;
 649
 650         if (unlikely(inet_send_prepare(sk)))
 651                 return -EAGAIN;
 652
 653         /* IPV6_ADDRFORM can change sk->sk_prot under us. */
 654         prot = READ_ONCE(sk->sk_prot);
 655         return INDIRECT_CALL_2(prot->sendmsg, tcp_sendmsg, udpv6_sendmsg,
 656                                sk, msg, size);
 657 }
 658
 659 INDIRECT_CALLABLE_DECLARE(int udpv6_recvmsg(struct sock *, struct msghdr *,
 660                                             size_t, int, int *));
 661 int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
 662                   int flags)
 663 {
 664         struct sock *sk = sock->sk;
 665         const struct proto *prot;
 666         int addr_len = 0;
 667         int err;
 668
 669         if (likely(!(flags & MSG_ERRQUEUE)))
 670                 sock_rps_record_flow(sk);
 671
 672         /* IPV6_ADDRFORM can change sk->sk_prot under us. */
 673         prot = READ_ONCE(sk->sk_prot);
 674         err = INDIRECT_CALL_2(prot->recvmsg, tcp_recvmsg, udpv6_recvmsg,
 675                               sk, msg, size, flags, &addr_len);
 676         if (err >= 0)
 677                 msg->msg_namelen = addr_len;
 678         return err;
 679 }
 680
 681 const struct proto_ops inet6_stream_ops = {
 682         .family            = PF_INET6,
 683         .owner             = THIS_MODULE,
 684         .release           = inet6_release,
 685         .bind              = inet6_bind,
 686         .connect           = inet_stream_connect,       /* ok           */
 687         .socketpair        = sock_no_socketpair,        /* a do nothing */
 688         .accept            = inet_accept,               /* ok           */
 689         .getname           = inet6_getname,
 690         .poll              = tcp_poll,                  /* ok           */
 691         .ioctl             = inet6_ioctl,               /* must change  */
 692         .gettstamp         = sock_gettstamp,
 693         .listen            = inet_listen,               /* ok           */
 694         .shutdown          = inet_shutdown,             /* ok           */
 695         .setsockopt        = sock_common_setsockopt,    /* ok           */
 696         .getsockopt        = sock_common_getsockopt,    /* ok           */
 697         .sendmsg           = inet6_sendmsg,             /* retpoline's sake */
 698         .recvmsg           = inet6_recvmsg,             /* retpoline's sake */
 699 #ifdef CONFIG_MMU
 700         .mmap              = tcp_mmap,
 701 #endif
 702         .splice_eof        = inet_splice_eof,
 703         .sendmsg_locked    = tcp_sendmsg_locked,
 704         .splice_read       = tcp_splice_read,
 705         .read_sock         = tcp_read_sock,
 706         .read_skb          = tcp_read_skb,
 707         .peek_len          = tcp_peek_len,
 708 #ifdef CONFIG_COMPAT
 709         .compat_ioctl      = inet6_compat_ioctl,
 710 #endif
 711         .set_rcvlowat      = tcp_set_rcvlowat,
 712 };
 713
 714 const struct proto_ops inet6_dgram_ops = {
 715         .family            = PF_INET6,
 716         .owner             = THIS_MODULE,
 717         .release           = inet6_release,
 718         .bind              = inet6_bind,
 719         .connect           = inet_dgram_connect,        /* ok           */
 720         .socketpair        = sock_no_socketpair,        /* a do nothing */
 721         .accept            = sock_no_accept,            /* a do nothing */
 722         .getname           = inet6_getname,
 723         .poll              = udp_poll,                  /* ok           */
 724         .ioctl             = inet6_ioctl,               /* must change  */
 725         .gettstamp         = sock_gettstamp,
 726         .listen            = sock_no_listen,            /* ok           */
 727         .shutdown          = inet_shutdown,             /* ok           */
 728         .setsockopt        = sock_common_setsockopt,    /* ok           */
 729         .getsockopt        = sock_common_getsockopt,    /* ok           */
 730         .sendmsg           = inet6_sendmsg,             /* retpoline's sake */
 731         .recvmsg           = inet6_recvmsg,             /* retpoline's sake */
 732         .read_skb          = udp_read_skb,
 733         .mmap              = sock_no_mmap,
 734         .set_peek_off      = sk_set_peek_off,
 735 #ifdef CONFIG_COMPAT
 736         .compat_ioctl      = inet6_compat_ioctl,
 737 #endif
 738 };
 739
 740 static const struct net_proto_family inet6_family_ops = {
 741         .family = PF_INET6,
 742         .create = inet6_create,
 743         .owner  = THIS_MODULE,
 744 };
 745
 746 int inet6_register_protosw(struct inet_protosw *p)
 747 {
 748         struct list_head *lh;
 749         struct inet_protosw *answer;
 750         struct list_head *last_perm;
 751         int protocol = p->protocol;
 752         int ret;
 753
 754         spin_lock_bh(&inetsw6_lock);
 755
 756         ret = -EINVAL;
 757         if (p->type >= SOCK_MAX)
 758                 goto out_illegal;
 759
 760         /* If we are trying to override a permanent protocol, bail. */
 761         answer = NULL;
 762         ret = -EPERM;
 763         last_perm = &inetsw6[p->type];
 764         list_for_each(lh, &inetsw6[p->type]) {
 765                 answer = list_entry(lh, struct inet_protosw, list);
 766
 767                 /* Check only the non-wild match. */
 768                 if (INET_PROTOSW_PERMANENT & answer->flags) {
 769                         if (protocol == answer->protocol)
 770                                 break;
 771                         last_perm = lh;
 772                 }
 773
 774                 answer = NULL;
 775         }
 776         if (answer)
 777                 goto out_permanent;
 778
 779         /* Add the new entry after the last permanent entry if any, so that
 780          * the new entry does not override a permanent entry when matched with
 781          * a wild-card protocol. But it is allowed to override any existing
 782          * non-permanent entry.  This means that when we remove this entry, the
 783          * system automatically returns to the old behavior.
 784          */
 785         list_add_rcu(&p->list, last_perm);
 786         ret = 0;
 787 out:
 788         spin_unlock_bh(&inetsw6_lock);
 789         return ret;
 790
 791 out_permanent:
 792         pr_err("Attempt to override permanent protocol %d\n", protocol);
 793         goto out;
 794
 795 out_illegal:
 796         pr_err("Ignoring attempt to register invalid socket type %d\n",
 797                p->type);
 798         goto out;
 799 }
 800 EXPORT_SYMBOL(inet6_register_protosw);
 801
 802 void
 803 inet6_unregister_protosw(struct inet_protosw *p)
 804 {
 805         if (INET_PROTOSW_PERMANENT & p->flags) {
 806                 pr_err("Attempt to unregister permanent protocol %d\n",
 807                        p->protocol);
 808         } else {
 809                 spin_lock_bh(&inetsw6_lock);
 810                 list_del_rcu(&p->list);
 811                 spin_unlock_bh(&inetsw6_lock);
 812
 813                 synchronize_net();
 814         }
 815 }
 816 EXPORT_SYMBOL(inet6_unregister_protosw);
 817
 818 int inet6_sk_rebuild_header(struct sock *sk)
 819 {
 820         struct ipv6_pinfo *np = inet6_sk(sk);
 821         struct dst_entry *dst;
 822
 823         dst = __sk_dst_check(sk, np->dst_cookie);
 824
 825         if (!dst) {
 826                 struct inet_sock *inet = inet_sk(sk);
 827                 struct in6_addr *final_p, final;
 828                 struct flowi6 fl6;
 829
 830                 memset(&fl6, 0, sizeof(fl6));
 831                 fl6.flowi6_proto = sk->sk_protocol;
 832                 fl6.daddr = sk->sk_v6_daddr;
 833                 fl6.saddr = np->saddr;
 834                 fl6.flowlabel = np->flow_label;
 835                 fl6.flowi6_oif = sk->sk_bound_dev_if;
 836                 fl6.flowi6_mark = sk->sk_mark;
 837                 fl6.fl6_dport = inet->inet_dport;
 838                 fl6.fl6_sport = inet->inet_sport;
 839                 fl6.flowi6_uid = sk->sk_uid;
 840                 security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6));
 841
 842                 rcu_read_lock();
 843                 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt),
 844                                          &final);
 845                 rcu_read_unlock();
 846
 847                 dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
 848                 if (IS_ERR(dst)) {
 849                         sk->sk_route_caps = 0;
 850                         WRITE_ONCE(sk->sk_err_soft, -PTR_ERR(dst));
 851                         return PTR_ERR(dst);
 852                 }
 853
 854                 ip6_dst_store(sk, dst, NULL, NULL);
 855         }
 856
 857         return 0;
 858 }
 859 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
 860
 861 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
 862                        const struct inet6_skb_parm *opt)
 863 {
 864         const struct ipv6_pinfo *np = inet6_sk(sk);
 865
 866         if (np->rxopt.all) {
 867                 if (((opt->flags & IP6SKB_HOPBYHOP) &&
 868                      (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) ||
 869                     (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) &&
 870                      np->rxopt.bits.rxflow) ||
 871                     (opt->srcrt && (np->rxopt.bits.srcrt ||
 872                      np->rxopt.bits.osrcrt)) ||
 873                     ((opt->dst1 || opt->dst0) &&
 874                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
 875                         return true;
 876         }
 877         return false;
 878 }
 879 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
 880
 881 static struct packet_type ipv6_packet_type __read_mostly = {
 882         .type = cpu_to_be16(ETH_P_IPV6),
 883         .func = ipv6_rcv,
 884         .list_func = ipv6_list_rcv,
 885 };
 886
 887 static int __init ipv6_packet_init(void)
 888 {
 889         dev_add_pack(&ipv6_packet_type);
 890         return 0;
 891 }
 892
 893 static void ipv6_packet_cleanup(void)
 894 {
 895         dev_remove_pack(&ipv6_packet_type);
 896 }
 897
 898 static int __net_init ipv6_init_mibs(struct net *net)
 899 {
 900         int i;
 901
 902         net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib);
 903         if (!net->mib.udp_stats_in6)
 904                 return -ENOMEM;
 905         net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib);
 906         if (!net->mib.udplite_stats_in6)
 907                 goto err_udplite_mib;
 908         net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib);
 909         if (!net->mib.ipv6_statistics)
 910                 goto err_ip_mib;
 911
 912         for_each_possible_cpu(i) {
 913                 struct ipstats_mib *af_inet6_stats;
 914                 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i);
 915                 u64_stats_init(&af_inet6_stats->syncp);
 916         }
 917
 918
 919         net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib);
 920         if (!net->mib.icmpv6_statistics)
 921                 goto err_icmp_mib;
 922         net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
 923                                                 GFP_KERNEL);
 924         if (!net->mib.icmpv6msg_statistics)
 925                 goto err_icmpmsg_mib;
 926         return 0;
 927
 928 err_icmpmsg_mib:
 929         free_percpu(net->mib.icmpv6_statistics);
 930 err_icmp_mib:
 931         free_percpu(net->mib.ipv6_statistics);
 932 err_ip_mib:
 933         free_percpu(net->mib.udplite_stats_in6);
 934 err_udplite_mib:
 935         free_percpu(net->mib.udp_stats_in6);
 936         return -ENOMEM;
 937 }
 938
 939 static void ipv6_cleanup_mibs(struct net *net)
 940 {
 941         free_percpu(net->mib.udp_stats_in6);
 942         free_percpu(net->mib.udplite_stats_in6);
 943         free_percpu(net->mib.ipv6_statistics);
 944         free_percpu(net->mib.icmpv6_statistics);
 945         kfree(net->mib.icmpv6msg_statistics);
 946 }
 947
 948 static int __net_init inet6_net_init(struct net *net)
 949 {
 950         int err = 0;
 951
 952         net->ipv6.sysctl.bindv6only = 0;
 953         net->ipv6.sysctl.icmpv6_time = 1*HZ;
 954         net->ipv6.sysctl.icmpv6_echo_ignore_all = 0;
 955         net->ipv6.sysctl.icmpv6_echo_ignore_multicast = 0;
 956         net->ipv6.sysctl.icmpv6_echo_ignore_anycast = 0;
 957         net->ipv6.sysctl.icmpv6_error_anycast_as_unicast = 0;
 958
 959         /* By default, rate limit error messages.
 960          * Except for pmtu discovery, it would break it.
 961          * proc_do_large_bitmap needs pointer to the bitmap.
 962          */
 963         bitmap_set(net->ipv6.sysctl.icmpv6_ratemask, 0, ICMPV6_ERRMSG_MAX + 1);
 964         bitmap_clear(net->ipv6.sysctl.icmpv6_ratemask, ICMPV6_PKT_TOOBIG, 1);
 965         net->ipv6.sysctl.icmpv6_ratemask_ptr = net->ipv6.sysctl.icmpv6_ratemask;
 966
 967         net->ipv6.sysctl.flowlabel_consistency = 1;
 968         net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS;
 969         net->ipv6.sysctl.idgen_retries = 3;
 970         net->ipv6.sysctl.idgen_delay = 1 * HZ;
 971         net->ipv6.sysctl.flowlabel_state_ranges = 0;
 972         net->ipv6.sysctl.max_dst_opts_cnt = IP6_DEFAULT_MAX_DST_OPTS_CNT;
 973         net->ipv6.sysctl.max_hbh_opts_cnt = IP6_DEFAULT_MAX_HBH_OPTS_CNT;
 974         net->ipv6.sysctl.max_dst_opts_len = IP6_DEFAULT_MAX_DST_OPTS_LEN;
 975         net->ipv6.sysctl.max_hbh_opts_len = IP6_DEFAULT_MAX_HBH_OPTS_LEN;
 976         net->ipv6.sysctl.fib_notify_on_flag_change = 0;
 977         atomic_set(&net->ipv6.fib6_sernum, 1);
 978
 979         net->ipv6.sysctl.ioam6_id = IOAM6_DEFAULT_ID;
 980         net->ipv6.sysctl.ioam6_id_wide = IOAM6_DEFAULT_ID_WIDE;
 981
 982         err = ipv6_init_mibs(net);
 983         if (err)
 984                 return err;
 985 #ifdef CONFIG_PROC_FS
 986         err = udp6_proc_init(net);
 987         if (err)
 988                 goto out;
 989         err = tcp6_proc_init(net);
 990         if (err)
 991                 goto proc_tcp6_fail;
 992         err = ac6_proc_init(net);
 993         if (err)
 994                 goto proc_ac6_fail;
 995 #endif
 996         return err;
 997
 998 #ifdef CONFIG_PROC_FS
 999 proc_ac6_fail:
1000         tcp6_proc_exit(net);
1001 proc_tcp6_fail:
1002         udp6_proc_exit(net);
1003 out:
1004         ipv6_cleanup_mibs(net);
1005         return err;
1006 #endif
1007 }
1008
1009 static void __net_exit inet6_net_exit(struct net *net)
1010 {
1011 #ifdef CONFIG_PROC_FS
1012         udp6_proc_exit(net);
1013         tcp6_proc_exit(net);
1014         ac6_proc_exit(net);
1015 #endif
1016         ipv6_cleanup_mibs(net);
1017 }
1018
1019 static struct pernet_operations inet6_net_ops = {
1020         .init = inet6_net_init,
1021         .exit = inet6_net_exit,
1022 };
1023
1024 static int ipv6_route_input(struct sk_buff *skb)
1025 {
1026         ip6_route_input(skb);
1027         return skb_dst(skb)->error;
1028 }
1029
1030 static const struct ipv6_stub ipv6_stub_impl = {
1031         .ipv6_sock_mc_join = ipv6_sock_mc_join,
1032         .ipv6_sock_mc_drop = ipv6_sock_mc_drop,
1033         .ipv6_dst_lookup_flow = ip6_dst_lookup_flow,
1034         .ipv6_route_input  = ipv6_route_input,
1035         .fib6_get_table    = fib6_get_table,
1036         .fib6_table_lookup = fib6_table_lookup,
1037         .fib6_lookup       = fib6_lookup,
1038         .fib6_select_path  = fib6_select_path,
1039         .ip6_mtu_from_fib6 = ip6_mtu_from_fib6,
1040         .fib6_nh_init      = fib6_nh_init,
1041         .fib6_nh_release   = fib6_nh_release,
1042         .fib6_nh_release_dsts = fib6_nh_release_dsts,
1043         .fib6_update_sernum = fib6_update_sernum_stub,
1044         .fib6_rt_update    = fib6_rt_update,
1045         .ip6_del_rt        = ip6_del_rt,
1046         .udpv6_encap_enable = udpv6_encap_enable,
1047         .ndisc_send_na = ndisc_send_na,
1048 #if IS_ENABLED(CONFIG_XFRM)
1049         .xfrm6_local_rxpmtu = xfrm6_local_rxpmtu,
1050         .xfrm6_udp_encap_rcv = xfrm6_udp_encap_rcv,
1051         .xfrm6_rcv_encap = xfrm6_rcv_encap,
1052 #endif
1053         .nd_tbl = &nd_tbl,
1054         .ipv6_fragment = ip6_fragment,
1055         .ipv6_dev_find = ipv6_dev_find,
1056 };
1057
1058 static const struct ipv6_bpf_stub ipv6_bpf_stub_impl = {
1059         .inet6_bind = __inet6_bind,
1060         .udp6_lib_lookup = __udp6_lib_lookup,
1061         .ipv6_setsockopt = do_ipv6_setsockopt,
1062         .ipv6_getsockopt = do_ipv6_getsockopt,
1063 };
1064
1065 static int __init inet6_init(void)
1066 {
1067         struct list_head *r;
1068         int err = 0;
1069
1070         sock_skb_cb_check_size(sizeof(struct inet6_skb_parm));
1071
1072         /* Register the socket-side information for inet6_create.  */
1073         for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
1074                 INIT_LIST_HEAD(r);
1075
1076         raw_hashinfo_init(&raw_v6_hashinfo);
1077
1078         if (disable_ipv6_mod) {
1079                 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
1080                 goto out;
1081         }
1082
1083         err = proto_register(&tcpv6_prot, 1);
1084         if (err)
1085                 goto out;
1086
1087         err = proto_register(&udpv6_prot, 1);
1088         if (err)
1089                 goto out_unregister_tcp_proto;
1090
1091         err = proto_register(&udplitev6_prot, 1);
1092         if (err)
1093                 goto out_unregister_udp_proto;
1094
1095         err = proto_register(&rawv6_prot, 1);
1096         if (err)
1097                 goto out_unregister_udplite_proto;
1098
1099         err = proto_register(&pingv6_prot, 1);
1100         if (err)
1101                 goto out_unregister_raw_proto;
1102
1103         /* We MUST register RAW sockets before we create the ICMP6,
1104          * IGMP6, or NDISC control sockets.
1105          */
1106         err = rawv6_init();
1107         if (err)
1108                 goto out_unregister_ping_proto;
1109
1110         /* Register the family here so that the init calls below will
1111          * be able to create sockets. (?? is this dangerous ??)
1112          */
1113         err = sock_register(&inet6_family_ops);
1114         if (err)
1115                 goto out_sock_register_fail;
1116
1117         /*
1118          *      ipngwg API draft makes clear that the correct semantics
1119          *      for TCP and UDP is to consider one TCP and UDP instance
1120          *      in a host available by both INET and INET6 APIs and
1121          *      able to communicate via both network protocols.
1122          */
1123
1124         err = register_pernet_subsys(&inet6_net_ops);
1125         if (err)
1126                 goto register_pernet_fail;
1127         err = ip6_mr_init();
1128         if (err)
1129                 goto ipmr_fail;
1130         err = icmpv6_init();
1131         if (err)
1132                 goto icmp_fail;
1133         err = ndisc_init();
1134         if (err)
1135                 goto ndisc_fail;
1136         err = igmp6_init();
1137         if (err)
1138                 goto igmp_fail;
1139
1140         err = ipv6_netfilter_init();
1141         if (err)
1142                 goto netfilter_fail;
1143         /* Create /proc/foo6 entries. */
1144 #ifdef CONFIG_PROC_FS
1145         err = -ENOMEM;
1146         if (raw6_proc_init())
1147                 goto proc_raw6_fail;
1148         if (udplite6_proc_init())
1149                 goto proc_udplite6_fail;
1150         if (ipv6_misc_proc_init())
1151                 goto proc_misc6_fail;
1152         if (if6_proc_init())
1153                 goto proc_if6_fail;
1154 #endif
1155         err = ip6_route_init();
1156         if (err)
1157                 goto ip6_route_fail;
1158         err = ndisc_late_init();
1159         if (err)
1160                 goto ndisc_late_fail;
1161         err = ip6_flowlabel_init();
1162         if (err)
1163                 goto ip6_flowlabel_fail;
1164         err = ipv6_anycast_init();
1165         if (err)
1166                 goto ipv6_anycast_fail;
1167         err = addrconf_init();
1168         if (err)
1169                 goto addrconf_fail;
1170
1171         /* Init v6 extension headers. */
1172         err = ipv6_exthdrs_init();
1173         if (err)
1174                 goto ipv6_exthdrs_fail;
1175
1176         err = ipv6_frag_init();
1177         if (err)
1178                 goto ipv6_frag_fail;
1179
1180         /* Init v6 transport protocols. */
1181         err = udpv6_init();
1182         if (err)
1183                 goto udpv6_fail;
1184
1185         err = udplitev6_init();
1186         if (err)
1187                 goto udplitev6_fail;
1188
1189         err = udpv6_offload_init();
1190         if (err)
1191                 goto udpv6_offload_fail;
1192
1193         err = tcpv6_init();
1194         if (err)
1195                 goto tcpv6_fail;
1196
1197         err = ipv6_packet_init();
1198         if (err)
1199                 goto ipv6_packet_fail;
1200
1201         err = pingv6_init();
1202         if (err)
1203                 goto pingv6_fail;
1204
1205         err = calipso_init();
1206         if (err)
1207                 goto calipso_fail;
1208
1209         err = seg6_init();
1210         if (err)
1211                 goto seg6_fail;
1212
1213         err = rpl_init();
1214         if (err)
1215                 goto rpl_fail;
1216
1217         err = ioam6_init();
1218         if (err)
1219                 goto ioam6_fail;
1220
1221         err = igmp6_late_init();
1222         if (err)
1223                 goto igmp6_late_err;
1224
1225 #ifdef CONFIG_SYSCTL
1226         err = ipv6_sysctl_register();
1227         if (err)
1228                 goto sysctl_fail;
1229 #endif
1230
1231         /* ensure that ipv6 stubs are visible only after ipv6 is ready */
1232         wmb();
1233         ipv6_stub = &ipv6_stub_impl;
1234         ipv6_bpf_stub = &ipv6_bpf_stub_impl;
1235 out:
1236         return err;
1237
1238 #ifdef CONFIG_SYSCTL
1239 sysctl_fail:
1240         igmp6_late_cleanup();
1241 #endif
1242 igmp6_late_err:
1243         ioam6_exit();
1244 ioam6_fail:
1245         rpl_exit();
1246 rpl_fail:
1247         seg6_exit();
1248 seg6_fail:
1249         calipso_exit();
1250 calipso_fail:
1251         pingv6_exit();
1252 pingv6_fail:
1253         ipv6_packet_cleanup();
1254 ipv6_packet_fail:
1255         tcpv6_exit();
1256 tcpv6_fail:
1257         udpv6_offload_exit();
1258 udpv6_offload_fail:
1259         udplitev6_exit();
1260 udplitev6_fail:
1261         udpv6_exit();
1262 udpv6_fail:
1263         ipv6_frag_exit();
1264 ipv6_frag_fail:
1265         ipv6_exthdrs_exit();
1266 ipv6_exthdrs_fail:
1267         addrconf_cleanup();
1268 addrconf_fail:
1269         ipv6_anycast_cleanup();
1270 ipv6_anycast_fail:
1271         ip6_flowlabel_cleanup();
1272 ip6_flowlabel_fail:
1273         ndisc_late_cleanup();
1274 ndisc_late_fail:
1275         ip6_route_cleanup();
1276 ip6_route_fail:
1277 #ifdef CONFIG_PROC_FS
1278         if6_proc_exit();
1279 proc_if6_fail:
1280         ipv6_misc_proc_exit();
1281 proc_misc6_fail:
1282         udplite6_proc_exit();
1283 proc_udplite6_fail:
1284         raw6_proc_exit();
1285 proc_raw6_fail:
1286 #endif
1287         ipv6_netfilter_fini();
1288 netfilter_fail:
1289         igmp6_cleanup();
1290 igmp_fail:
1291         ndisc_cleanup();
1292 ndisc_fail:
1293         icmpv6_cleanup();
1294 icmp_fail:
1295         ip6_mr_cleanup();
1296 ipmr_fail:
1297         unregister_pernet_subsys(&inet6_net_ops);
1298 register_pernet_fail:
1299         sock_unregister(PF_INET6);
1300         rtnl_unregister_all(PF_INET6);
1301 out_sock_register_fail:
1302         rawv6_exit();
1303 out_unregister_ping_proto:
1304         proto_unregister(&pingv6_prot);
1305 out_unregister_raw_proto:
1306         proto_unregister(&rawv6_prot);
1307 out_unregister_udplite_proto:
1308         proto_unregister(&udplitev6_prot);
1309 out_unregister_udp_proto:
1310         proto_unregister(&udpv6_prot);
1311 out_unregister_tcp_proto:
1312         proto_unregister(&tcpv6_prot);
1313         goto out;
1314 }
1315 module_init(inet6_init);
1316
1317 MODULE_ALIAS_NETPROTO(PF_INET6);