net/ipv6/af_inet6.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *      PF_INET6 socket protocol family
   4  *      Linux INET6 implementation
   5  *
   6  *      Authors:
   7  *      Pedro Roque             <roque@di.fc.ul.pt>
   8  *
   9  *      Adapted from linux/net/ipv4/af_inet.c
  10  *
  11  *      Fixes:
  12  *      piggy, Karl Knutson     :       Socket protocol table
  13  *      Hideaki YOSHIFUJI       :       sin6_scope_id support
  14  *      Arnaldo Melo            :       check proc_net_create return, cleanups
  15  */
  16
  17 #define pr_fmt(fmt) "IPv6: " fmt
  18
  19 #include <linux/module.h>
  20 #include <linux/capability.h>
  21 #include <linux/errno.h>
  22 #include <linux/types.h>
  23 #include <linux/socket.h>
  24 #include <linux/in.h>
  25 #include <linux/kernel.h>
  26 #include <linux/timer.h>
  27 #include <linux/string.h>
  28 #include <linux/sockios.h>
  29 #include <linux/net.h>
  30 #include <linux/fcntl.h>
  31 #include <linux/mm.h>
  32 #include <linux/interrupt.h>
  33 #include <linux/proc_fs.h>
  34 #include <linux/stat.h>
  35 #include <linux/init.h>
  36 #include <linux/slab.h>
  37
  38 #include <linux/inet.h>
  39 #include <linux/netdevice.h>
  40 #include <linux/icmpv6.h>
  41 #include <linux/netfilter_ipv6.h>
  42
  43 #include <net/ip.h>
  44 #include <net/ipv6.h>
  45 #include <net/udp.h>
  46 #include <net/udplite.h>
  47 #include <net/tcp.h>
  48 #include <net/ping.h>
  49 #include <net/protocol.h>
  50 #include <net/inet_common.h>
  51 #include <net/route.h>
  52 #include <net/transp_v6.h>
  53 #include <net/ip6_route.h>
  54 #include <net/addrconf.h>
  55 #include <net/ipv6_stubs.h>
  56 #include <net/ndisc.h>
  57 #ifdef CONFIG_IPV6_TUNNEL
  58 #include <net/ip6_tunnel.h>
  59 #endif
  60 #include <net/calipso.h>
  61 #include <net/seg6.h>
  62 #include <net/rpl.h>
  63 #include <net/compat.h>
  64 #include <net/xfrm.h>
  65 #include <net/ioam6.h>
  66 #include <net/rawv6.h>
  67
  68 #include <linux/uaccess.h>
  69 #include <linux/mroute6.h>
  70
  71 #include "ip6_offload.h"
  72
  73 MODULE_AUTHOR("Cast of dozens");
  74 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
  75 MODULE_LICENSE("GPL");
  76
  77 /* The inetsw6 table contains everything that inet6_create needs to
  78  * build a new socket.
  79  */
  80 static struct list_head inetsw6[SOCK_MAX];
  81 static DEFINE_SPINLOCK(inetsw6_lock);
  82
  83 struct ipv6_params ipv6_defaults = {
  84         .disable_ipv6 = 0,
  85         .autoconf = 1,
  86 };
  87
  88 static int disable_ipv6_mod;
  89
  90 module_param_named(disable, disable_ipv6_mod, int, 0444);
  91 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
  92
  93 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
  94 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
  95
  96 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
  97 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
  98
  99 bool ipv6_mod_enabled(void)
 100 {
 101         return disable_ipv6_mod == 0;
 102 }
 103 EXPORT_SYMBOL_GPL(ipv6_mod_enabled);
 104
 105 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
 106 {
 107         const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
 108
 109         return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
 110 }
 111
 112 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->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
 204
 205         if (SOCK_RAW == sock->type) {
 206                 inet->inet_num = protocol;
 207                 if (IPPROTO_RAW == protocol)
 208                         inet->hdrincl = 1;
 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
 226         /* Init the ipv4 part of the socket since we can have sockets
 227          * using v6 API for ipv4.
 228          */
 229         inet->uc_ttl    = -1;
 230
 231         inet->mc_loop   = 1;
 232         inet->mc_ttl    = 1;
 233         inet->mc_index  = 0;
 234         RCU_INIT_POINTER(inet->mc_list, NULL);
 235         inet->rcv_tos   = 0;
 236
 237         if (READ_ONCE(net->ipv4.sysctl_ip_no_pmtu_disc))
 238                 inet->pmtudisc = IP_PMTUDISC_DONT;
 239         else
 240                 inet->pmtudisc = IP_PMTUDISC_WANT;
 241         /*
 242          * Increment only the relevant sk_prot->socks debug field, this changes
 243          * the previous behaviour of incrementing both the equivalent to
 244          * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
 245          *
 246          * This allows better debug granularity as we'll know exactly how many
 247          * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
 248          * transport protocol socks. -acme
 249          */
 250         sk_refcnt_debug_inc(sk);
 251
 252         if (inet->inet_num) {
 253                 /* It assumes that any protocol which allows
 254                  * the user to assign a number at socket
 255                  * creation time automatically shares.
 256                  */
 257                 inet->inet_sport = htons(inet->inet_num);
 258                 err = sk->sk_prot->hash(sk);
 259                 if (err) {
 260                         sk_common_release(sk);
 261                         goto out;
 262                 }
 263         }
 264         if (sk->sk_prot->init) {
 265                 err = sk->sk_prot->init(sk);
 266                 if (err) {
 267                         sk_common_release(sk);
 268                         goto out;
 269                 }
 270         }
 271
 272         if (!kern) {
 273                 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
 274                 if (err) {
 275                         sk_common_release(sk);
 276                         goto out;
 277                 }
 278         }
 279 out:
 280         return err;
 281 out_rcu_unlock:
 282         rcu_read_unlock();
 283         goto out;
 284 }
 285
 286 static int __inet6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
 287                         u32 flags)
 288 {
 289         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
 290         struct inet_sock *inet = inet_sk(sk);
 291         struct ipv6_pinfo *np = inet6_sk(sk);
 292         struct net *net = sock_net(sk);
 293         __be32 v4addr = 0;
 294         unsigned short snum;
 295         bool saved_ipv6only;
 296         int addr_type = 0;
 297         int err = 0;
 298
 299         if (addr->sin6_family != AF_INET6)
 300                 return -EAFNOSUPPORT;
 301
 302         addr_type = ipv6_addr_type(&addr->sin6_addr);
 303         if ((addr_type & IPV6_ADDR_MULTICAST) && sk->sk_type == SOCK_STREAM)
 304                 return -EINVAL;
 305
 306         snum = ntohs(addr->sin6_port);
 307         if (!(flags & BIND_NO_CAP_NET_BIND_SERVICE) &&
 308             snum && inet_port_requires_bind_service(net, snum) &&
 309             !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
 310                 return -EACCES;
 311
 312         if (flags & BIND_WITH_LOCK)
 313                 lock_sock(sk);
 314
 315         /* Check these errors (active socket, double bind). */
 316         if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
 317                 err = -EINVAL;
 318                 goto out;
 319         }
 320
 321         /* Check if the address belongs to the host. */
 322         if (addr_type == IPV6_ADDR_MAPPED) {
 323                 struct net_device *dev = NULL;
 324                 int chk_addr_ret;
 325
 326                 /* Binding to v4-mapped address on a v6-only socket
 327                  * makes no sense
 328                  */
 329                 if (ipv6_only_sock(sk)) {
 330                         err = -EINVAL;
 331                         goto out;
 332                 }
 333
 334                 rcu_read_lock();
 335                 if (sk->sk_bound_dev_if) {
 336                         dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
 337                         if (!dev) {
 338                                 err = -ENODEV;
 339                                 goto out_unlock;
 340                         }
 341                 }
 342
 343                 /* Reproduce AF_INET checks to make the bindings consistent */
 344                 v4addr = addr->sin6_addr.s6_addr32[3];
 345                 chk_addr_ret = inet_addr_type_dev_table(net, dev, v4addr);
 346                 rcu_read_unlock();
 347
 348                 if (!inet_addr_valid_or_nonlocal(net, inet, v4addr,
 349                                                  chk_addr_ret)) {
 350                         err = -EADDRNOTAVAIL;
 351                         goto out;
 352                 }
 353         } else {
 354                 if (addr_type != IPV6_ADDR_ANY) {
 355                         struct net_device *dev = NULL;
 356
 357                         rcu_read_lock();
 358                         if (__ipv6_addr_needs_scope_id(addr_type)) {
 359                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 360                                     addr->sin6_scope_id) {
 361                                         /* Override any existing binding, if another one
 362                                          * is supplied by user.
 363                                          */
 364                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
 365                                 }
 366
 367                                 /* Binding to link-local address requires an interface */
 368                                 if (!sk->sk_bound_dev_if) {
 369                                         err = -EINVAL;
 370                                         goto out_unlock;
 371                                 }
 372                         }
 373
 374                         if (sk->sk_bound_dev_if) {
 375                                 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
 376                                 if (!dev) {
 377                                         err = -ENODEV;
 378                                         goto out_unlock;
 379                                 }
 380                         }
 381
 382                         /* ipv4 addr of the socket is invalid.  Only the
 383                          * unspecified and mapped address have a v4 equivalent.
 384                          */
 385                         v4addr = LOOPBACK4_IPV6;
 386                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
 387                                 if (!ipv6_can_nonlocal_bind(net, inet) &&
 388                                     !ipv6_chk_addr(net, &addr->sin6_addr,
 389                                                    dev, 0)) {
 390                                         err = -EADDRNOTAVAIL;
 391                                         goto out_unlock;
 392                                 }
 393                         }
 394                         rcu_read_unlock();
 395                 }
 396         }
 397
 398         inet->inet_rcv_saddr = v4addr;
 399         inet->inet_saddr = v4addr;
 400
 401         sk->sk_v6_rcv_saddr = addr->sin6_addr;
 402
 403         if (!(addr_type & IPV6_ADDR_MULTICAST))
 404                 np->saddr = addr->sin6_addr;
 405
 406         saved_ipv6only = sk->sk_ipv6only;
 407         if (addr_type != IPV6_ADDR_ANY && addr_type != IPV6_ADDR_MAPPED)
 408                 sk->sk_ipv6only = 1;
 409
 410         /* Make sure we are allowed to bind here. */
 411         if (snum || !(inet->bind_address_no_port ||
 412                       (flags & BIND_FORCE_ADDRESS_NO_PORT))) {
 413                 if (sk->sk_prot->get_port(sk, snum)) {
 414                         sk->sk_ipv6only = saved_ipv6only;
 415                         inet_reset_saddr(sk);
 416                         err = -EADDRINUSE;
 417                         goto out;
 418                 }
 419                 if (!(flags & BIND_FROM_BPF)) {
 420                         err = BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk);
 421                         if (err) {
 422                                 sk->sk_ipv6only = saved_ipv6only;
 423                                 inet_reset_saddr(sk);
 424                                 if (sk->sk_prot->put_port)
 425                                         sk->sk_prot->put_port(sk);
 426                                 goto out;
 427                         }
 428                 }
 429         }
 430
 431         if (addr_type != IPV6_ADDR_ANY)
 432                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
 433         if (snum)
 434                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
 435         inet->inet_sport = htons(inet->inet_num);
 436         inet->inet_dport = 0;
 437         inet->inet_daddr = 0;
 438 out:
 439         if (flags & BIND_WITH_LOCK)
 440                 release_sock(sk);
 441         return err;
 442 out_unlock:
 443         rcu_read_unlock();
 444         goto out;
 445 }
 446
 447 /* bind for INET6 API */
 448 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 449 {
 450         struct sock *sk = sock->sk;
 451         u32 flags = BIND_WITH_LOCK;
 452         const struct proto *prot;
 453         int err = 0;
 454
 455         /* IPV6_ADDRFORM can change sk->sk_prot under us. */
 456         prot = READ_ONCE(sk->sk_prot);
 457         /* If the socket has its own bind function then use it. */
 458         if (prot->bind)
 459                 return prot->bind(sk, uaddr, addr_len);
 460
 461         if (addr_len < SIN6_LEN_RFC2133)
 462                 return -EINVAL;
 463
 464         /* BPF prog is run before any checks are done so that if the prog
 465          * changes context in a wrong way it will be caught.
 466          */
 467         err = BPF_CGROUP_RUN_PROG_INET_BIND_LOCK(sk, uaddr,
 468                                                  CGROUP_INET6_BIND, &flags);
 469         if (err)
 470                 return err;
 471
 472         return __inet6_bind(sk, uaddr, addr_len, flags);
 473 }
 474 EXPORT_SYMBOL(inet6_bind);
 475
 476 int inet6_release(struct socket *sock)
 477 {
 478         struct sock *sk = sock->sk;
 479
 480         if (!sk)
 481                 return -EINVAL;
 482
 483         /* Free mc lists */
 484         ipv6_sock_mc_close(sk);
 485
 486         /* Free ac lists */
 487         ipv6_sock_ac_close(sk);
 488
 489         return inet_release(sock);
 490 }
 491 EXPORT_SYMBOL(inet6_release);
 492
 493 void inet6_cleanup_sock(struct sock *sk)
 494 {
 495         struct ipv6_pinfo *np = inet6_sk(sk);
 496         struct sk_buff *skb;
 497         struct ipv6_txoptions *opt;
 498
 499         /* Release rx options */
 500
 501         skb = xchg(&np->pktoptions, NULL);
 502         kfree_skb(skb);
 503
 504         skb = xchg(&np->rxpmtu, NULL);
 505         kfree_skb(skb);
 506
 507         /* Free flowlabels */
 508         fl6_free_socklist(sk);
 509
 510         /* Free tx options */
 511
 512         opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL);
 513         if (opt) {
 514                 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 515                 txopt_put(opt);
 516         }
 517 }
 518 EXPORT_SYMBOL_GPL(inet6_cleanup_sock);
 519
 520 /*
 521  *      This does both peername and sockname.
 522  */
 523 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 524                   int peer)
 525 {
 526         struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
 527         struct sock *sk = sock->sk;
 528         struct inet_sock *inet = inet_sk(sk);
 529         struct ipv6_pinfo *np = inet6_sk(sk);
 530
 531         sin->sin6_family = AF_INET6;
 532         sin->sin6_flowinfo = 0;
 533         sin->sin6_scope_id = 0;
 534         lock_sock(sk);
 535         if (peer) {
 536                 if (!inet->inet_dport ||
 537                     (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
 538                     peer == 1)) {
 539                         release_sock(sk);
 540                         return -ENOTCONN;
 541                 }
 542                 sin->sin6_port = inet->inet_dport;
 543                 sin->sin6_addr = sk->sk_v6_daddr;
 544                 if (np->sndflow)
 545                         sin->sin6_flowinfo = np->flow_label;
 546                 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin,
 547                                        CGROUP_INET6_GETPEERNAME);
 548         } else {
 549                 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
 550                         sin->sin6_addr = np->saddr;
 551                 else
 552                         sin->sin6_addr = sk->sk_v6_rcv_saddr;
 553                 sin->sin6_port = inet->inet_sport;
 554                 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin,
 555                                        CGROUP_INET6_GETSOCKNAME);
 556         }
 557         sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
 558                                                  sk->sk_bound_dev_if);
 559         release_sock(sk);
 560         return sizeof(*sin);
 561 }
 562 EXPORT_SYMBOL(inet6_getname);
 563
 564 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 565 {
 566         void __user *argp = (void __user *)arg;
 567         struct sock *sk = sock->sk;
 568         struct net *net = sock_net(sk);
 569         const struct proto *prot;
 570
 571         switch (cmd) {
 572         case SIOCADDRT:
 573         case SIOCDELRT: {
 574                 struct in6_rtmsg rtmsg;
 575
 576                 if (copy_from_user(&rtmsg, argp, sizeof(rtmsg)))
 577                         return -EFAULT;
 578                 return ipv6_route_ioctl(net, cmd, &rtmsg);
 579         }
 580         case SIOCSIFADDR:
 581                 return addrconf_add_ifaddr(net, argp);
 582         case SIOCDIFADDR:
 583                 return addrconf_del_ifaddr(net, argp);
 584         case SIOCSIFDSTADDR:
 585                 return addrconf_set_dstaddr(net, argp);
 586         default:
 587                 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
 588                 prot = READ_ONCE(sk->sk_prot);
 589                 if (!prot->ioctl)
 590                         return -ENOIOCTLCMD;
 591                 return prot->ioctl(sk, cmd, arg);
 592         }
 593         /*NOTREACHED*/
 594         return 0;
 595 }
 596 EXPORT_SYMBOL(inet6_ioctl);
 597
 598 #ifdef CONFIG_COMPAT
 599 struct compat_in6_rtmsg {
 600         struct in6_addr         rtmsg_dst;
 601         struct in6_addr         rtmsg_src;
 602         struct in6_addr         rtmsg_gateway;
 603         u32                     rtmsg_type;
 604         u16                     rtmsg_dst_len;
 605         u16                     rtmsg_src_len;
 606         u32                     rtmsg_metric;
 607         u32                     rtmsg_info;
 608         u32                     rtmsg_flags;
 609         s32                     rtmsg_ifindex;
 610 };
 611
 612 static int inet6_compat_routing_ioctl(struct sock *sk, unsigned int cmd,
 613                 struct compat_in6_rtmsg __user *ur)
 614 {
 615         struct in6_rtmsg rt;
 616
 617         if (copy_from_user(&rt.rtmsg_dst, &ur->rtmsg_dst,
 618                         3 * sizeof(struct in6_addr)) ||
 619             get_user(rt.rtmsg_type, &ur->rtmsg_type) ||
 620             get_user(rt.rtmsg_dst_len, &ur->rtmsg_dst_len) ||
 621             get_user(rt.rtmsg_src_len, &ur->rtmsg_src_len) ||
 622             get_user(rt.rtmsg_metric, &ur->rtmsg_metric) ||
 623             get_user(rt.rtmsg_info, &ur->rtmsg_info) ||
 624             get_user(rt.rtmsg_flags, &ur->rtmsg_flags) ||
 625             get_user(rt.rtmsg_ifindex, &ur->rtmsg_ifindex))
 626                 return -EFAULT;
 627
 628
 629         return ipv6_route_ioctl(sock_net(sk), cmd, &rt);
 630 }
 631
 632 int inet6_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 633 {
 634         void __user *argp = compat_ptr(arg);
 635         struct sock *sk = sock->sk;
 636
 637         switch (cmd) {
 638         case SIOCADDRT:
 639         case SIOCDELRT:
 640                 return inet6_compat_routing_ioctl(sk, cmd, argp);
 641         default:
 642                 return -ENOIOCTLCMD;
 643         }
 644 }
 645 EXPORT_SYMBOL_GPL(inet6_compat_ioctl);
 646 #endif /* CONFIG_COMPAT */
 647
 648 INDIRECT_CALLABLE_DECLARE(int udpv6_sendmsg(struct sock *, struct msghdr *,
 649                                             size_t));
 650 int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
 651 {
 652         struct sock *sk = sock->sk;
 653         const struct proto *prot;
 654
 655         if (unlikely(inet_send_prepare(sk)))
 656                 return -EAGAIN;
 657
 658         /* IPV6_ADDRFORM can change sk->sk_prot under us. */
 659         prot = READ_ONCE(sk->sk_prot);
 660         return INDIRECT_CALL_2(prot->sendmsg, tcp_sendmsg, udpv6_sendmsg,
 661                                sk, msg, size);
 662 }
 663
 664 INDIRECT_CALLABLE_DECLARE(int udpv6_recvmsg(struct sock *, struct msghdr *,
 665                                             size_t, int, int *));
 666 int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
 667                   int flags)
 668 {
 669         struct sock *sk = sock->sk;
 670         const struct proto *prot;
 671         int addr_len = 0;
 672         int err;
 673
 674         if (likely(!(flags & MSG_ERRQUEUE)))
 675                 sock_rps_record_flow(sk);
 676
 677         /* IPV6_ADDRFORM can change sk->sk_prot under us. */
 678         prot = READ_ONCE(sk->sk_prot);
 679         err = INDIRECT_CALL_2(prot->recvmsg, tcp_recvmsg, udpv6_recvmsg,
 680                               sk, msg, size, flags, &addr_len);
 681         if (err >= 0)
 682                 msg->msg_namelen = addr_len;
 683         return err;
 684 }
 685
 686 const struct proto_ops inet6_stream_ops = {
 687         .family            = PF_INET6,
 688         .owner             = THIS_MODULE,
 689         .release           = inet6_release,
 690         .bind              = inet6_bind,
 691         .connect           = inet_stream_connect,       /* ok           */
 692         .socketpair        = sock_no_socketpair,        /* a do nothing */
 693         .accept            = inet_accept,               /* ok           */
 694         .getname           = inet6_getname,
 695         .poll              = tcp_poll,                  /* ok           */
 696         .ioctl             = inet6_ioctl,               /* must change  */
 697         .gettstamp         = sock_gettstamp,
 698         .listen            = inet_listen,               /* ok           */
 699         .shutdown          = inet_shutdown,             /* ok           */
 700         .setsockopt        = sock_common_setsockopt,    /* ok           */
 701         .getsockopt        = sock_common_getsockopt,    /* ok           */
 702         .sendmsg           = inet6_sendmsg,             /* retpoline's sake */
 703         .recvmsg           = inet6_recvmsg,             /* retpoline's sake */
 704 #ifdef CONFIG_MMU
 705         .mmap              = tcp_mmap,
 706 #endif
 707         .sendpage          = inet_sendpage,
 708         .sendmsg_locked    = tcp_sendmsg_locked,
 709         .sendpage_locked   = tcp_sendpage_locked,
 710         .splice_read       = tcp_splice_read,
 711         .read_sock         = tcp_read_sock,
 712         .read_skb          = tcp_read_skb,
 713         .peek_len          = tcp_peek_len,
 714 #ifdef CONFIG_COMPAT
 715         .compat_ioctl      = inet6_compat_ioctl,
 716 #endif
 717         .set_rcvlowat      = tcp_set_rcvlowat,
 718 };
 719
 720 const struct proto_ops inet6_dgram_ops = {
 721         .family            = PF_INET6,
 722         .owner             = THIS_MODULE,
 723         .release           = inet6_release,
 724         .bind              = inet6_bind,
 725         .connect           = inet_dgram_connect,        /* ok           */
 726         .socketpair        = sock_no_socketpair,        /* a do nothing */
 727         .accept            = sock_no_accept,            /* a do nothing */
 728         .getname           = inet6_getname,
 729         .poll              = udp_poll,                  /* ok           */
 730         .ioctl             = inet6_ioctl,               /* must change  */
 731         .gettstamp         = sock_gettstamp,
 732         .listen            = sock_no_listen,            /* ok           */
 733         .shutdown          = inet_shutdown,             /* ok           */
 734         .setsockopt        = sock_common_setsockopt,    /* ok           */
 735         .getsockopt        = sock_common_getsockopt,    /* ok           */
 736         .sendmsg           = inet6_sendmsg,             /* retpoline's sake */
 737         .recvmsg           = inet6_recvmsg,             /* retpoline's sake */
 738         .read_skb          = udp_read_skb,
 739         .mmap              = sock_no_mmap,
 740         .sendpage          = sock_no_sendpage,
 741         .set_peek_off      = sk_set_peek_off,
 742 #ifdef CONFIG_COMPAT
 743         .compat_ioctl      = inet6_compat_ioctl,
 744 #endif
 745 };
 746
 747 static const struct net_proto_family inet6_family_ops = {
 748         .family = PF_INET6,
 749         .create = inet6_create,
 750         .owner  = THIS_MODULE,
 751 };
 752
 753 int inet6_register_protosw(struct inet_protosw *p)
 754 {
 755         struct list_head *lh;
 756         struct inet_protosw *answer;
 757         struct list_head *last_perm;
 758         int protocol = p->protocol;
 759         int ret;
 760
 761         spin_lock_bh(&inetsw6_lock);
 762
 763         ret = -EINVAL;
 764         if (p->type >= SOCK_MAX)
 765                 goto out_illegal;
 766
 767         /* If we are trying to override a permanent protocol, bail. */
 768         answer = NULL;
 769         ret = -EPERM;
 770         last_perm = &inetsw6[p->type];
 771         list_for_each(lh, &inetsw6[p->type]) {
 772                 answer = list_entry(lh, struct inet_protosw, list);
 773
 774                 /* Check only the non-wild match. */
 775                 if (INET_PROTOSW_PERMANENT & answer->flags) {
 776                         if (protocol == answer->protocol)
 777                                 break;
 778                         last_perm = lh;
 779                 }
 780
 781                 answer = NULL;
 782         }
 783         if (answer)
 784                 goto out_permanent;
 785
 786         /* Add the new entry after the last permanent entry if any, so that
 787          * the new entry does not override a permanent entry when matched with
 788          * a wild-card protocol. But it is allowed to override any existing
 789          * non-permanent entry.  This means that when we remove this entry, the
 790          * system automatically returns to the old behavior.
 791          */
 792         list_add_rcu(&p->list, last_perm);
 793         ret = 0;
 794 out:
 795         spin_unlock_bh(&inetsw6_lock);
 796         return ret;
 797
 798 out_permanent:
 799         pr_err("Attempt to override permanent protocol %d\n", protocol);
 800         goto out;
 801
 802 out_illegal:
 803         pr_err("Ignoring attempt to register invalid socket type %d\n",
 804                p->type);
 805         goto out;
 806 }
 807 EXPORT_SYMBOL(inet6_register_protosw);
 808
 809 void
 810 inet6_unregister_protosw(struct inet_protosw *p)
 811 {
 812         if (INET_PROTOSW_PERMANENT & p->flags) {
 813                 pr_err("Attempt to unregister permanent protocol %d\n",
 814                        p->protocol);
 815         } else {
 816                 spin_lock_bh(&inetsw6_lock);
 817                 list_del_rcu(&p->list);
 818                 spin_unlock_bh(&inetsw6_lock);
 819
 820                 synchronize_net();
 821         }
 822 }
 823 EXPORT_SYMBOL(inet6_unregister_protosw);
 824
 825 int inet6_sk_rebuild_header(struct sock *sk)
 826 {
 827         struct ipv6_pinfo *np = inet6_sk(sk);
 828         struct dst_entry *dst;
 829
 830         dst = __sk_dst_check(sk, np->dst_cookie);
 831
 832         if (!dst) {
 833                 struct inet_sock *inet = inet_sk(sk);
 834                 struct in6_addr *final_p, final;
 835                 struct flowi6 fl6;
 836
 837                 memset(&fl6, 0, sizeof(fl6));
 838                 fl6.flowi6_proto = sk->sk_protocol;
 839                 fl6.daddr = sk->sk_v6_daddr;
 840                 fl6.saddr = np->saddr;
 841                 fl6.flowlabel = np->flow_label;
 842                 fl6.flowi6_oif = sk->sk_bound_dev_if;
 843                 fl6.flowi6_mark = sk->sk_mark;
 844                 fl6.fl6_dport = inet->inet_dport;
 845                 fl6.fl6_sport = inet->inet_sport;
 846                 fl6.flowi6_uid = sk->sk_uid;
 847                 security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6));
 848
 849                 rcu_read_lock();
 850                 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt),
 851                                          &final);
 852                 rcu_read_unlock();
 853
 854                 dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
 855                 if (IS_ERR(dst)) {
 856                         sk->sk_route_caps = 0;
 857                         sk->sk_err_soft = -PTR_ERR(dst);
 858                         return PTR_ERR(dst);
 859                 }
 860
 861                 ip6_dst_store(sk, dst, NULL, NULL);
 862         }
 863
 864         return 0;
 865 }
 866 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
 867
 868 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
 869                        const struct inet6_skb_parm *opt)
 870 {
 871         const struct ipv6_pinfo *np = inet6_sk(sk);
 872
 873         if (np->rxopt.all) {
 874                 if (((opt->flags & IP6SKB_HOPBYHOP) &&
 875                      (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) ||
 876                     (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) &&
 877                      np->rxopt.bits.rxflow) ||
 878                     (opt->srcrt && (np->rxopt.bits.srcrt ||
 879                      np->rxopt.bits.osrcrt)) ||
 880                     ((opt->dst1 || opt->dst0) &&
 881                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
 882                         return true;
 883         }
 884         return false;
 885 }
 886 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
 887
 888 static struct packet_type ipv6_packet_type __read_mostly = {
 889         .type = cpu_to_be16(ETH_P_IPV6),
 890         .func = ipv6_rcv,
 891         .list_func = ipv6_list_rcv,
 892 };
 893
 894 static int __init ipv6_packet_init(void)
 895 {
 896         dev_add_pack(&ipv6_packet_type);
 897         return 0;
 898 }
 899
 900 static void ipv6_packet_cleanup(void)
 901 {
 902         dev_remove_pack(&ipv6_packet_type);
 903 }
 904
 905 static int __net_init ipv6_init_mibs(struct net *net)
 906 {
 907         int i;
 908
 909         net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib);
 910         if (!net->mib.udp_stats_in6)
 911                 return -ENOMEM;
 912         net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib);
 913         if (!net->mib.udplite_stats_in6)
 914                 goto err_udplite_mib;
 915         net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib);
 916         if (!net->mib.ipv6_statistics)
 917                 goto err_ip_mib;
 918
 919         for_each_possible_cpu(i) {
 920                 struct ipstats_mib *af_inet6_stats;
 921                 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i);
 922                 u64_stats_init(&af_inet6_stats->syncp);
 923         }
 924
 925
 926         net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib);
 927         if (!net->mib.icmpv6_statistics)
 928                 goto err_icmp_mib;
 929         net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
 930                                                 GFP_KERNEL);
 931         if (!net->mib.icmpv6msg_statistics)
 932                 goto err_icmpmsg_mib;
 933         return 0;
 934
 935 err_icmpmsg_mib:
 936         free_percpu(net->mib.icmpv6_statistics);
 937 err_icmp_mib:
 938         free_percpu(net->mib.ipv6_statistics);
 939 err_ip_mib:
 940         free_percpu(net->mib.udplite_stats_in6);
 941 err_udplite_mib:
 942         free_percpu(net->mib.udp_stats_in6);
 943         return -ENOMEM;
 944 }
 945
 946 static void ipv6_cleanup_mibs(struct net *net)
 947 {
 948         free_percpu(net->mib.udp_stats_in6);
 949         free_percpu(net->mib.udplite_stats_in6);
 950         free_percpu(net->mib.ipv6_statistics);
 951         free_percpu(net->mib.icmpv6_statistics);
 952         kfree(net->mib.icmpv6msg_statistics);
 953 }
 954
 955 static int __net_init inet6_net_init(struct net *net)
 956 {
 957         int err = 0;
 958
 959         net->ipv6.sysctl.bindv6only = 0;
 960         net->ipv6.sysctl.icmpv6_time = 1*HZ;
 961         net->ipv6.sysctl.icmpv6_echo_ignore_all = 0;
 962         net->ipv6.sysctl.icmpv6_echo_ignore_multicast = 0;
 963         net->ipv6.sysctl.icmpv6_echo_ignore_anycast = 0;
 964
 965         /* By default, rate limit error messages.
 966          * Except for pmtu discovery, it would break it.
 967          * proc_do_large_bitmap needs pointer to the bitmap.
 968          */
 969         bitmap_set(net->ipv6.sysctl.icmpv6_ratemask, 0, ICMPV6_ERRMSG_MAX + 1);
 970         bitmap_clear(net->ipv6.sysctl.icmpv6_ratemask, ICMPV6_PKT_TOOBIG, 1);
 971         net->ipv6.sysctl.icmpv6_ratemask_ptr = net->ipv6.sysctl.icmpv6_ratemask;
 972
 973         net->ipv6.sysctl.flowlabel_consistency = 1;
 974         net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS;
 975         net->ipv6.sysctl.idgen_retries = 3;
 976         net->ipv6.sysctl.idgen_delay = 1 * HZ;
 977         net->ipv6.sysctl.flowlabel_state_ranges = 0;
 978         net->ipv6.sysctl.max_dst_opts_cnt = IP6_DEFAULT_MAX_DST_OPTS_CNT;
 979         net->ipv6.sysctl.max_hbh_opts_cnt = IP6_DEFAULT_MAX_HBH_OPTS_CNT;
 980         net->ipv6.sysctl.max_dst_opts_len = IP6_DEFAULT_MAX_DST_OPTS_LEN;
 981         net->ipv6.sysctl.max_hbh_opts_len = IP6_DEFAULT_MAX_HBH_OPTS_LEN;
 982         net->ipv6.sysctl.fib_notify_on_flag_change = 0;
 983         atomic_set(&net->ipv6.fib6_sernum, 1);
 984
 985         net->ipv6.sysctl.ioam6_id = IOAM6_DEFAULT_ID;
 986         net->ipv6.sysctl.ioam6_id_wide = IOAM6_DEFAULT_ID_WIDE;
 987
 988         err = ipv6_init_mibs(net);
 989         if (err)
 990                 return err;
 991 #ifdef CONFIG_PROC_FS
 992         err = udp6_proc_init(net);
 993         if (err)
 994                 goto out;
 995         err = tcp6_proc_init(net);
 996         if (err)
 997                 goto proc_tcp6_fail;
 998         err = ac6_proc_init(net);
 999         if (err)
1000                 goto proc_ac6_fail;
1001 #endif
1002         return err;
1003
1004 #ifdef CONFIG_PROC_FS
1005 proc_ac6_fail:
1006         tcp6_proc_exit(net);
1007 proc_tcp6_fail:
1008         udp6_proc_exit(net);
1009 out:
1010         ipv6_cleanup_mibs(net);
1011         return err;
1012 #endif
1013 }
1014
1015 static void __net_exit inet6_net_exit(struct net *net)
1016 {
1017 #ifdef CONFIG_PROC_FS
1018         udp6_proc_exit(net);
1019         tcp6_proc_exit(net);
1020         ac6_proc_exit(net);
1021 #endif
1022         ipv6_cleanup_mibs(net);
1023 }
1024
1025 static struct pernet_operations inet6_net_ops = {
1026         .init = inet6_net_init,
1027         .exit = inet6_net_exit,
1028 };
1029
1030 static int ipv6_route_input(struct sk_buff *skb)
1031 {
1032         ip6_route_input(skb);
1033         return skb_dst(skb)->error;
1034 }
1035
1036 static const struct ipv6_stub ipv6_stub_impl = {
1037         .ipv6_sock_mc_join = ipv6_sock_mc_join,
1038         .ipv6_sock_mc_drop = ipv6_sock_mc_drop,
1039         .ipv6_dst_lookup_flow = ip6_dst_lookup_flow,
1040         .ipv6_route_input  = ipv6_route_input,
1041         .fib6_get_table    = fib6_get_table,
1042         .fib6_table_lookup = fib6_table_lookup,
1043         .fib6_lookup       = fib6_lookup,
1044         .fib6_select_path  = fib6_select_path,
1045         .ip6_mtu_from_fib6 = ip6_mtu_from_fib6,
1046         .fib6_nh_init      = fib6_nh_init,
1047         .fib6_nh_release   = fib6_nh_release,
1048         .fib6_nh_release_dsts = fib6_nh_release_dsts,
1049         .fib6_update_sernum = fib6_update_sernum_stub,
1050         .fib6_rt_update    = fib6_rt_update,
1051         .ip6_del_rt        = ip6_del_rt,
1052         .udpv6_encap_enable = udpv6_encap_enable,
1053         .ndisc_send_na = ndisc_send_na,
1054 #if IS_ENABLED(CONFIG_XFRM)
1055         .xfrm6_local_rxpmtu = xfrm6_local_rxpmtu,
1056         .xfrm6_udp_encap_rcv = xfrm6_udp_encap_rcv,
1057         .xfrm6_rcv_encap = xfrm6_rcv_encap,
1058 #endif
1059         .nd_tbl = &nd_tbl,
1060         .ipv6_fragment = ip6_fragment,
1061         .ipv6_dev_find = ipv6_dev_find,
1062 };
1063
1064 static const struct ipv6_bpf_stub ipv6_bpf_stub_impl = {
1065         .inet6_bind = __inet6_bind,
1066         .udp6_lib_lookup = __udp6_lib_lookup,
1067         .ipv6_setsockopt = do_ipv6_setsockopt,
1068         .ipv6_getsockopt = do_ipv6_getsockopt,
1069 };
1070
1071 static int __init inet6_init(void)
1072 {
1073         struct list_head *r;
1074         int err = 0;
1075
1076         sock_skb_cb_check_size(sizeof(struct inet6_skb_parm));
1077
1078         /* Register the socket-side information for inet6_create.  */
1079         for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
1080                 INIT_LIST_HEAD(r);
1081
1082         raw_hashinfo_init(&raw_v6_hashinfo);
1083
1084         if (disable_ipv6_mod) {
1085                 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
1086                 goto out;
1087         }
1088
1089         err = proto_register(&tcpv6_prot, 1);
1090         if (err)
1091                 goto out;
1092
1093         err = proto_register(&udpv6_prot, 1);
1094         if (err)
1095                 goto out_unregister_tcp_proto;
1096
1097         err = proto_register(&udplitev6_prot, 1);
1098         if (err)
1099                 goto out_unregister_udp_proto;
1100
1101         err = proto_register(&rawv6_prot, 1);
1102         if (err)
1103                 goto out_unregister_udplite_proto;
1104
1105         err = proto_register(&pingv6_prot, 1);
1106         if (err)
1107                 goto out_unregister_raw_proto;
1108
1109         /* We MUST register RAW sockets before we create the ICMP6,
1110          * IGMP6, or NDISC control sockets.
1111          */
1112         err = rawv6_init();
1113         if (err)
1114                 goto out_unregister_ping_proto;
1115
1116         /* Register the family here so that the init calls below will
1117          * be able to create sockets. (?? is this dangerous ??)
1118          */
1119         err = sock_register(&inet6_family_ops);
1120         if (err)
1121                 goto out_sock_register_fail;
1122
1123         /*
1124          *      ipngwg API draft makes clear that the correct semantics
1125          *      for TCP and UDP is to consider one TCP and UDP instance
1126          *      in a host available by both INET and INET6 APIs and
1127          *      able to communicate via both network protocols.
1128          */
1129
1130         err = register_pernet_subsys(&inet6_net_ops);
1131         if (err)
1132                 goto register_pernet_fail;
1133         err = ip6_mr_init();
1134         if (err)
1135                 goto ipmr_fail;
1136         err = icmpv6_init();
1137         if (err)
1138                 goto icmp_fail;
1139         err = ndisc_init();
1140         if (err)
1141                 goto ndisc_fail;
1142         err = igmp6_init();
1143         if (err)
1144                 goto igmp_fail;
1145
1146         err = ipv6_netfilter_init();
1147         if (err)
1148                 goto netfilter_fail;
1149         /* Create /proc/foo6 entries. */
1150 #ifdef CONFIG_PROC_FS
1151         err = -ENOMEM;
1152         if (raw6_proc_init())
1153                 goto proc_raw6_fail;
1154         if (udplite6_proc_init())
1155                 goto proc_udplite6_fail;
1156         if (ipv6_misc_proc_init())
1157                 goto proc_misc6_fail;
1158         if (if6_proc_init())
1159                 goto proc_if6_fail;
1160 #endif
1161         err = ip6_route_init();
1162         if (err)
1163                 goto ip6_route_fail;
1164         err = ndisc_late_init();
1165         if (err)
1166                 goto ndisc_late_fail;
1167         err = ip6_flowlabel_init();
1168         if (err)
1169                 goto ip6_flowlabel_fail;
1170         err = ipv6_anycast_init();
1171         if (err)
1172                 goto ipv6_anycast_fail;
1173         err = addrconf_init();
1174         if (err)
1175                 goto addrconf_fail;
1176
1177         /* Init v6 extension headers. */
1178         err = ipv6_exthdrs_init();
1179         if (err)
1180                 goto ipv6_exthdrs_fail;
1181
1182         err = ipv6_frag_init();
1183         if (err)
1184                 goto ipv6_frag_fail;
1185
1186         /* Init v6 transport protocols. */
1187         err = udpv6_init();
1188         if (err)
1189                 goto udpv6_fail;
1190
1191         err = udplitev6_init();
1192         if (err)
1193                 goto udplitev6_fail;
1194
1195         err = udpv6_offload_init();
1196         if (err)
1197                 goto udpv6_offload_fail;
1198
1199         err = tcpv6_init();
1200         if (err)
1201                 goto tcpv6_fail;
1202
1203         err = ipv6_packet_init();
1204         if (err)
1205                 goto ipv6_packet_fail;
1206
1207         err = pingv6_init();
1208         if (err)
1209                 goto pingv6_fail;
1210
1211         err = calipso_init();
1212         if (err)
1213                 goto calipso_fail;
1214
1215         err = seg6_init();
1216         if (err)
1217                 goto seg6_fail;
1218
1219         err = rpl_init();
1220         if (err)
1221                 goto rpl_fail;
1222
1223         err = ioam6_init();
1224         if (err)
1225                 goto ioam6_fail;
1226
1227         err = igmp6_late_init();
1228         if (err)
1229                 goto igmp6_late_err;
1230
1231 #ifdef CONFIG_SYSCTL
1232         err = ipv6_sysctl_register();
1233         if (err)
1234                 goto sysctl_fail;
1235 #endif
1236
1237         /* ensure that ipv6 stubs are visible only after ipv6 is ready */
1238         wmb();
1239         ipv6_stub = &ipv6_stub_impl;
1240         ipv6_bpf_stub = &ipv6_bpf_stub_impl;
1241 out:
1242         return err;
1243
1244 #ifdef CONFIG_SYSCTL
1245 sysctl_fail:
1246         igmp6_late_cleanup();
1247 #endif
1248 igmp6_late_err:
1249         ioam6_exit();
1250 ioam6_fail:
1251         rpl_exit();
1252 rpl_fail:
1253         seg6_exit();
1254 seg6_fail:
1255         calipso_exit();
1256 calipso_fail:
1257         pingv6_exit();
1258 pingv6_fail:
1259         ipv6_packet_cleanup();
1260 ipv6_packet_fail:
1261         tcpv6_exit();
1262 tcpv6_fail:
1263         udpv6_offload_exit();
1264 udpv6_offload_fail:
1265         udplitev6_exit();
1266 udplitev6_fail:
1267         udpv6_exit();
1268 udpv6_fail:
1269         ipv6_frag_exit();
1270 ipv6_frag_fail:
1271         ipv6_exthdrs_exit();
1272 ipv6_exthdrs_fail:
1273         addrconf_cleanup();
1274 addrconf_fail:
1275         ipv6_anycast_cleanup();
1276 ipv6_anycast_fail:
1277         ip6_flowlabel_cleanup();
1278 ip6_flowlabel_fail:
1279         ndisc_late_cleanup();
1280 ndisc_late_fail:
1281         ip6_route_cleanup();
1282 ip6_route_fail:
1283 #ifdef CONFIG_PROC_FS
1284         if6_proc_exit();
1285 proc_if6_fail:
1286         ipv6_misc_proc_exit();
1287 proc_misc6_fail:
1288         udplite6_proc_exit();
1289 proc_udplite6_fail:
1290         raw6_proc_exit();
1291 proc_raw6_fail:
1292 #endif
1293         ipv6_netfilter_fini();
1294 netfilter_fail:
1295         igmp6_cleanup();
1296 igmp_fail:
1297         ndisc_cleanup();
1298 ndisc_fail:
1299         icmpv6_cleanup();
1300 icmp_fail:
1301         ip6_mr_cleanup();
1302 ipmr_fail:
1303         unregister_pernet_subsys(&inet6_net_ops);
1304 register_pernet_fail:
1305         sock_unregister(PF_INET6);
1306         rtnl_unregister_all(PF_INET6);
1307 out_sock_register_fail:
1308         rawv6_exit();
1309 out_unregister_ping_proto:
1310         proto_unregister(&pingv6_prot);
1311 out_unregister_raw_proto:
1312         proto_unregister(&rawv6_prot);
1313 out_unregister_udplite_proto:
1314         proto_unregister(&udplitev6_prot);
1315 out_unregister_udp_proto:
1316         proto_unregister(&udpv6_prot);
1317 out_unregister_tcp_proto:
1318         proto_unregister(&tcpv6_prot);
1319         goto out;
1320 }
1321 module_init(inet6_init);
1322
1323 MODULE_ALIAS_NETPROTO(PF_INET6);