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             <[email protected]>
   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 #include <net/rps.h>
  68
  69 #include <linux/uaccess.h>
  70 #include <linux/mroute6.h>
  71
  72 #include "ip6_offload.h"
  73
  74 MODULE_AUTHOR("Cast of dozens");
  75 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
  76 MODULE_LICENSE("GPL");
  77
  78 /* The inetsw6 table contains everything that inet6_create needs to
  79  * build a new socket.
  80  */
  81 static struct list_head inetsw6[SOCK_MAX];
  82 static DEFINE_SPINLOCK(inetsw6_lock);
  83
  84 struct ipv6_params ipv6_defaults = {
  85         .disable_ipv6 = 0,
  86         .autoconf = 1,
  87 };
  88
  89 static int disable_ipv6_mod;
  90
  91 module_param_named(disable, disable_ipv6_mod, int, 0444);
  92 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
  93
  94 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
  95 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
  96
  97 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
  98 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
  99
 100 bool ipv6_mod_enabled(void)
 101 {
 102         return disable_ipv6_mod == 0;
 103 }
 104 EXPORT_SYMBOL_GPL(ipv6_mod_enabled);
 105
 106 static struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
 107 {
 108         const int offset = sk->sk_prot->ipv6_pinfo_offset;
 109
 110         return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
 111 }
 112
 113 void inet6_sock_destruct(struct sock *sk)
 114 {
 115         inet6_cleanup_sock(sk);
 116         inet_sock_destruct(sk);
 117 }
 118 EXPORT_SYMBOL_GPL(inet6_sock_destruct);
 119
 120 static int inet6_create(struct net *net, struct socket *sock, int protocol,
 121                         int kern)
 122 {
 123         struct inet_sock *inet;
 124         struct ipv6_pinfo *np;
 125         struct sock *sk;
 126         struct inet_protosw *answer;
 127         struct proto *answer_prot;
 128         unsigned char answer_flags;
 129         int try_loading_module = 0;
 130         int err;
 131
 132         if (protocol < 0 || protocol >= IPPROTO_MAX)
 133                 return -EINVAL;
 134
 135         /* Look for the requested type/protocol pair. */
 136 lookup_protocol:
 137         err = -ESOCKTNOSUPPORT;
 138         rcu_read_lock();
 139         list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
 140
 141                 err = 0;
 142                 /* Check the non-wild match. */
 143                 if (protocol == answer->protocol) {
 144                         if (protocol != IPPROTO_IP)
 145                                 break;
 146                 } else {
 147                         /* Check for the two wild cases. */
 148                         if (IPPROTO_IP == protocol) {
 149                                 protocol = answer->protocol;
 150                                 break;
 151                         }
 152                         if (IPPROTO_IP == answer->protocol)
 153                                 break;
 154                 }
 155                 err = -EPROTONOSUPPORT;
 156         }
 157
 158         if (err) {
 159                 if (try_loading_module < 2) {
 160                         rcu_read_unlock();
 161                         /*
 162                          * Be more specific, e.g. net-pf-10-proto-132-type-1
 163                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
 164                          */
 165                         if (++try_loading_module == 1)
 166                                 request_module("net-pf-%d-proto-%d-type-%d",
 167                                                 PF_INET6, protocol, sock->type);
 168                         /*
 169                          * Fall back to generic, e.g. net-pf-10-proto-132
 170                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
 171                          */
 172                         else
 173                                 request_module("net-pf-%d-proto-%d",
 174                                                 PF_INET6, protocol);
 175                         goto lookup_protocol;
 176                 } else
 177                         goto out_rcu_unlock;
 178         }
 179
 180         err = -EPERM;
 181         if (sock->type == SOCK_RAW && !kern &&
 182             !ns_capable(net->user_ns, CAP_NET_RAW))
 183                 goto out_rcu_unlock;
 184
 185         sock->ops = answer->ops;
 186         answer_prot = answer->prot;
 187         answer_flags = answer->flags;
 188         rcu_read_unlock();
 189
 190         WARN_ON(!answer_prot->slab);
 191
 192         err = -ENOBUFS;
 193         sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern);
 194         if (!sk)
 195                 goto out;
 196
 197         sock_init_data(sock, sk);
 198
 199         err = 0;
 200         if (INET_PROTOSW_REUSE & answer_flags)
 201                 sk->sk_reuse = SK_CAN_REUSE;
 202
 203         if (INET_PROTOSW_ICSK & answer_flags)
 204                 inet_init_csk_locks(sk);
 205
 206         inet = inet_sk(sk);
 207         inet_assign_bit(IS_ICSK, sk, INET_PROTOSW_ICSK & answer_flags);
 208
 209         if (SOCK_RAW == sock->type) {
 210                 inet->inet_num = protocol;
 211                 if (IPPROTO_RAW == protocol)
 212                         inet_set_bit(HDRINCL, sk);
 213         }
 214
 215         sk->sk_destruct         = inet6_sock_destruct;
 216         sk->sk_family           = PF_INET6;
 217         sk->sk_protocol         = protocol;
 218
 219         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
 220
 221         inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
 222         np->hop_limit   = -1;
 223         np->mcast_hops  = IPV6_DEFAULT_MCASTHOPS;
 224         inet6_set_bit(MC6_LOOP, sk);
 225         inet6_set_bit(MC6_ALL, sk);
 226         np->pmtudisc    = IPV6_PMTUDISC_WANT;
 227         inet6_assign_bit(REPFLOW, sk, net->ipv6.sysctl.flowlabel_reflect &
 228                                      FLOWLABEL_REFLECT_ESTABLISHED);
 229         sk->sk_ipv6only = net->ipv6.sysctl.bindv6only;
 230         sk->sk_txrehash = READ_ONCE(net->core.sysctl_txrehash);
 231
 232         /* Init the ipv4 part of the socket since we can have sockets
 233          * using v6 API for ipv4.
 234          */
 235         inet->uc_ttl    = -1;
 236
 237         inet_set_bit(MC_LOOP, sk);
 238         inet->mc_ttl    = 1;
 239         inet->mc_index  = 0;
 240         RCU_INIT_POINTER(inet->mc_list, NULL);
 241         inet->rcv_tos   = 0;
 242
 243         if (READ_ONCE(net->ipv4.sysctl_ip_no_pmtu_disc))
 244                 inet->pmtudisc = IP_PMTUDISC_DONT;
 245         else
 246                 inet->pmtudisc = IP_PMTUDISC_WANT;
 247
 248         if (inet->inet_num) {
 249                 /* It assumes that any protocol which allows
 250                  * the user to assign a number at socket
 251                  * creation time automatically shares.
 252                  */
 253                 inet->inet_sport = htons(inet->inet_num);
 254                 err = sk->sk_prot->hash(sk);
 255                 if (err) {
 256                         sk_common_release(sk);
 257                         goto out;
 258                 }
 259         }
 260         if (sk->sk_prot->init) {
 261                 err = sk->sk_prot->init(sk);
 262                 if (err) {
 263                         sk_common_release(sk);
 264                         goto out;
 265                 }
 266         }
 267
 268         if (!kern) {
 269                 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
 270                 if (err) {
 271                         sk_common_release(sk);
 272                         goto out;
 273                 }
 274         }
 275 out:
 276         return err;
 277 out_rcu_unlock:
 278         rcu_read_unlock();
 279         goto out;
 280 }
 281
 282 static int __inet6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
 283                         u32 flags)
 284 {
 285         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
 286         struct inet_sock *inet = inet_sk(sk);
 287         struct ipv6_pinfo *np = inet6_sk(sk);
 288         struct net *net = sock_net(sk);
 289         __be32 v4addr = 0;
 290         unsigned short snum;
 291         bool saved_ipv6only;
 292         int addr_type = 0;
 293         int err = 0;
 294
 295         if (addr->sin6_family != AF_INET6)
 296                 return -EAFNOSUPPORT;
 297
 298         addr_type = ipv6_addr_type(&addr->sin6_addr);
 299         if ((addr_type & IPV6_ADDR_MULTICAST) && sk->sk_type == SOCK_STREAM)
 300                 return -EINVAL;
 301
 302         snum = ntohs(addr->sin6_port);
 303         if (!(flags & BIND_NO_CAP_NET_BIND_SERVICE) &&
 304             snum && inet_port_requires_bind_service(net, snum) &&
 305             !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
 306                 return -EACCES;
 307
 308         if (flags & BIND_WITH_LOCK)
 309                 lock_sock(sk);
 310
 311         /* Check these errors (active socket, double bind). */
 312         if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
 313                 err = -EINVAL;
 314                 goto out;
 315         }
 316
 317         /* Check if the address belongs to the host. */
 318         if (addr_type == IPV6_ADDR_MAPPED) {
 319                 struct net_device *dev = NULL;
 320                 int chk_addr_ret;
 321
 322                 /* Binding to v4-mapped address on a v6-only socket
 323                  * makes no sense
 324                  */
 325                 if (ipv6_only_sock(sk)) {
 326                         err = -EINVAL;
 327                         goto out;
 328                 }
 329
 330                 rcu_read_lock();
 331                 if (sk->sk_bound_dev_if) {
 332                         dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
 333                         if (!dev) {
 334                                 err = -ENODEV;
 335                                 goto out_unlock;
 336                         }
 337                 }
 338
 339                 /* Reproduce AF_INET checks to make the bindings consistent */
 340                 v4addr = addr->sin6_addr.s6_addr32[3];
 341                 chk_addr_ret = inet_addr_type_dev_table(net, dev, v4addr);
 342                 rcu_read_unlock();
 343
 344                 if (!inet_addr_valid_or_nonlocal(net, inet, v4addr,
 345                                                  chk_addr_ret)) {
 346                         err = -EADDRNOTAVAIL;
 347                         goto out;
 348                 }
 349         } else {
 350                 if (addr_type != IPV6_ADDR_ANY) {
 351                         struct net_device *dev = NULL;
 352
 353                         rcu_read_lock();
 354                         if (__ipv6_addr_needs_scope_id(addr_type)) {
 355                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 356                                     addr->sin6_scope_id) {
 357                                         /* Override any existing binding, if another one
 358                                          * is supplied by user.
 359                                          */
 360                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
 361                                 }
 362
 363                                 /* Binding to link-local address requires an interface */
 364                                 if (!sk->sk_bound_dev_if) {
 365                                         err = -EINVAL;
 366                                         goto out_unlock;
 367                                 }
 368                         }
 369
 370                         if (sk->sk_bound_dev_if) {
 371                                 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
 372                                 if (!dev) {
 373                                         err = -ENODEV;
 374                                         goto out_unlock;
 375                                 }
 376                         }
 377
 378                         /* ipv4 addr of the socket is invalid.  Only the
 379                          * unspecified and mapped address have a v4 equivalent.
 380                          */
 381                         v4addr = LOOPBACK4_IPV6;
 382                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
 383                                 if (!ipv6_can_nonlocal_bind(net, inet) &&
 384                                     !ipv6_chk_addr(net, &addr->sin6_addr,
 385                                                    dev, 0)) {
 386                                         err = -EADDRNOTAVAIL;
 387                                         goto out_unlock;
 388                                 }
 389                         }
 390                         rcu_read_unlock();
 391                 }
 392         }
 393
 394         inet->inet_rcv_saddr = v4addr;
 395         inet->inet_saddr = v4addr;
 396
 397         sk->sk_v6_rcv_saddr = addr->sin6_addr;
 398
 399         if (!(addr_type & IPV6_ADDR_MULTICAST))
 400                 np->saddr = addr->sin6_addr;
 401
 402         saved_ipv6only = sk->sk_ipv6only;
 403         if (addr_type != IPV6_ADDR_ANY && addr_type != IPV6_ADDR_MAPPED)
 404                 sk->sk_ipv6only = 1;
 405
 406         /* Make sure we are allowed to bind here. */
 407         if (snum || !(inet_test_bit(BIND_ADDRESS_NO_PORT, sk) ||
 408                       (flags & BIND_FORCE_ADDRESS_NO_PORT))) {
 409                 err = sk->sk_prot->get_port(sk, snum);
 410                 if (err) {
 411                         sk->sk_ipv6only = saved_ipv6only;
 412                         inet_reset_saddr(sk);
 413                         goto out;
 414                 }
 415                 if (!(flags & BIND_FROM_BPF)) {
 416                         err = BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk);
 417                         if (err) {
 418                                 sk->sk_ipv6only = saved_ipv6only;
 419                                 inet_reset_saddr(sk);
 420                                 if (sk->sk_prot->put_port)
 421                                         sk->sk_prot->put_port(sk);
 422                                 goto out;
 423                         }
 424                 }
 425         }
 426
 427         if (addr_type != IPV6_ADDR_ANY)
 428                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
 429         if (snum)
 430                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
 431         inet->inet_sport = htons(inet->inet_num);
 432         inet->inet_dport = 0;
 433         inet->inet_daddr = 0;
 434 out:
 435         if (flags & BIND_WITH_LOCK)
 436                 release_sock(sk);
 437         return err;
 438 out_unlock:
 439         rcu_read_unlock();
 440         goto out;
 441 }
 442
 443 int inet6_bind_sk(struct sock *sk, struct sockaddr *uaddr, int addr_len)
 444 {
 445         u32 flags = BIND_WITH_LOCK;
 446         const struct proto *prot;
 447         int err = 0;
 448
 449         /* IPV6_ADDRFORM can change sk->sk_prot under us. */
 450         prot = READ_ONCE(sk->sk_prot);
 451         /* If the socket has its own bind function then use it. */
 452         if (prot->bind)
 453                 return prot->bind(sk, uaddr, addr_len);
 454
 455         if (addr_len < SIN6_LEN_RFC2133)
 456                 return -EINVAL;
 457
 458         /* BPF prog is run before any checks are done so that if the prog
 459          * changes context in a wrong way it will be caught.
 460          */
 461         err = BPF_CGROUP_RUN_PROG_INET_BIND_LOCK(sk, uaddr, &addr_len,
 462                                                  CGROUP_INET6_BIND, &flags);
 463         if (err)
 464                 return err;
 465
 466         return __inet6_bind(sk, uaddr, addr_len, flags);
 467 }
 468
 469 /* bind for INET6 API */
 470 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 471 {
 472         return inet6_bind_sk(sock->sk, uaddr, addr_len);
 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         int sin_addr_len = sizeof(*sin);
 528         struct sock *sk = sock->sk;
 529         struct inet_sock *inet = inet_sk(sk);
 530         struct ipv6_pinfo *np = inet6_sk(sk);
 531
 532         sin->sin6_family = AF_INET6;
 533         sin->sin6_flowinfo = 0;
 534         sin->sin6_scope_id = 0;
 535         lock_sock(sk);
 536         if (peer) {
 537                 if (!inet->inet_dport ||
 538                     (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
 539                     peer == 1)) {
 540                         release_sock(sk);
 541                         return -ENOTCONN;
 542                 }
 543                 sin->sin6_port = inet->inet_dport;
 544                 sin->sin6_addr = sk->sk_v6_daddr;
 545                 if (inet6_test_bit(SNDFLOW, sk))
 546                         sin->sin6_flowinfo = np->flow_label;
 547                 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin, &sin_addr_len,
 548                                        CGROUP_INET6_GETPEERNAME);
 549         } else {
 550                 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
 551                         sin->sin6_addr = np->saddr;
 552                 else
 553                         sin->sin6_addr = sk->sk_v6_rcv_saddr;
 554                 sin->sin6_port = inet->inet_sport;
 555                 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin, &sin_addr_len,
 556                                        CGROUP_INET6_GETSOCKNAME);
 557         }
 558         sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
 559                                                  sk->sk_bound_dev_if);
 560         release_sock(sk);
 561         return sin_addr_len;
 562 }
 563 EXPORT_SYMBOL(inet6_getname);
 564
 565 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 566 {
 567         void __user *argp = (void __user *)arg;
 568         struct sock *sk = sock->sk;
 569         struct net *net = sock_net(sk);
 570         const struct proto *prot;
 571
 572         switch (cmd) {
 573         case SIOCADDRT:
 574         case SIOCDELRT: {
 575                 struct in6_rtmsg rtmsg;
 576
 577                 if (copy_from_user(&rtmsg, argp, sizeof(rtmsg)))
 578                         return -EFAULT;
 579                 return ipv6_route_ioctl(net, cmd, &rtmsg);
 580         }
 581         case SIOCSIFADDR:
 582                 return addrconf_add_ifaddr(net, argp);
 583         case SIOCDIFADDR:
 584                 return addrconf_del_ifaddr(net, argp);
 585         case SIOCSIFDSTADDR:
 586                 return addrconf_set_dstaddr(net, argp);
 587         default:
 588                 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
 589                 prot = READ_ONCE(sk->sk_prot);
 590                 if (!prot->ioctl)
 591                         return -ENOIOCTLCMD;
 592                 return sk_ioctl(sk, cmd, (void __user *)arg);
 593         }
 594         /*NOTREACHED*/
 595         return 0;
 596 }
 597 EXPORT_SYMBOL(inet6_ioctl);
 598
 599 #ifdef CONFIG_COMPAT
 600 struct compat_in6_rtmsg {
 601         struct in6_addr         rtmsg_dst;
 602         struct in6_addr         rtmsg_src;
 603         struct in6_addr         rtmsg_gateway;
 604         u32                     rtmsg_type;
 605         u16                     rtmsg_dst_len;
 606         u16                     rtmsg_src_len;
 607         u32                     rtmsg_metric;
 608         u32                     rtmsg_info;
 609         u32                     rtmsg_flags;
 610         s32                     rtmsg_ifindex;
 611 };
 612
 613 static int inet6_compat_routing_ioctl(struct sock *sk, unsigned int cmd,
 614                 struct compat_in6_rtmsg __user *ur)
 615 {
 616         struct in6_rtmsg rt;
 617
 618         if (copy_from_user(&rt.rtmsg_dst, &ur->rtmsg_dst,
 619                         3 * sizeof(struct in6_addr)) ||
 620             get_user(rt.rtmsg_type, &ur->rtmsg_type) ||
 621             get_user(rt.rtmsg_dst_len, &ur->rtmsg_dst_len) ||
 622             get_user(rt.rtmsg_src_len, &ur->rtmsg_src_len) ||
 623             get_user(rt.rtmsg_metric, &ur->rtmsg_metric) ||
 624             get_user(rt.rtmsg_info, &ur->rtmsg_info) ||
 625             get_user(rt.rtmsg_flags, &ur->rtmsg_flags) ||
 626             get_user(rt.rtmsg_ifindex, &ur->rtmsg_ifindex))
 627                 return -EFAULT;
 628
 629
 630         return ipv6_route_ioctl(sock_net(sk), cmd, &rt);
 631 }
 632
 633 int inet6_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 634 {
 635         void __user *argp = compat_ptr(arg);
 636         struct sock *sk = sock->sk;
 637
 638         switch (cmd) {
 639         case SIOCADDRT:
 640         case SIOCDELRT:
 641                 return inet6_compat_routing_ioctl(sk, cmd, argp);
 642         default:
 643                 return -ENOIOCTLCMD;
 644         }
 645 }
 646 EXPORT_SYMBOL_GPL(inet6_compat_ioctl);
 647 #endif /* CONFIG_COMPAT */
 648
 649 INDIRECT_CALLABLE_DECLARE(int udpv6_sendmsg(struct sock *, struct msghdr *,
 650                                             size_t));
 651 int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
 652 {
 653         struct sock *sk = sock->sk;
 654         const struct proto *prot;
 655
 656         if (unlikely(inet_send_prepare(sk)))
 657                 return -EAGAIN;
 658
 659         /* IPV6_ADDRFORM can change sk->sk_prot under us. */
 660         prot = READ_ONCE(sk->sk_prot);
 661         return INDIRECT_CALL_2(prot->sendmsg, tcp_sendmsg, udpv6_sendmsg,
 662                                sk, msg, size);
 663 }
 664
 665 INDIRECT_CALLABLE_DECLARE(int udpv6_recvmsg(struct sock *, struct msghdr *,
 666                                             size_t, int, int *));
 667 int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
 668                   int flags)
 669 {
 670         struct sock *sk = sock->sk;
 671         const struct proto *prot;
 672         int addr_len = 0;
 673         int err;
 674
 675         if (likely(!(flags & MSG_ERRQUEUE)))
 676                 sock_rps_record_flow(sk);
 677
 678         /* IPV6_ADDRFORM can change sk->sk_prot under us. */
 679         prot = READ_ONCE(sk->sk_prot);
 680         err = INDIRECT_CALL_2(prot->recvmsg, tcp_recvmsg, udpv6_recvmsg,
 681                               sk, msg, size, flags, &addr_len);
 682         if (err >= 0)
 683                 msg->msg_namelen = addr_len;
 684         return err;
 685 }
 686
 687 const struct proto_ops inet6_stream_ops = {
 688         .family            = PF_INET6,
 689         .owner             = THIS_MODULE,
 690         .release           = inet6_release,
 691         .bind              = inet6_bind,
 692         .connect           = inet_stream_connect,       /* ok           */
 693         .socketpair        = sock_no_socketpair,        /* a do nothing */
 694         .accept            = inet_accept,               /* ok           */
 695         .getname           = inet6_getname,
 696         .poll              = tcp_poll,                  /* ok           */
 697         .ioctl             = inet6_ioctl,               /* must change  */
 698         .gettstamp         = sock_gettstamp,
 699         .listen            = inet_listen,               /* ok           */
 700         .shutdown          = inet_shutdown,             /* ok           */
 701         .setsockopt        = sock_common_setsockopt,    /* ok           */
 702         .getsockopt        = sock_common_getsockopt,    /* ok           */
 703         .sendmsg           = inet6_sendmsg,             /* retpoline's sake */
 704         .recvmsg           = inet6_recvmsg,             /* retpoline's sake */
 705 #ifdef CONFIG_MMU
 706         .mmap              = tcp_mmap,
 707 #endif
 708         .splice_eof        = inet_splice_eof,
 709         .sendmsg_locked    = tcp_sendmsg_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         .set_peek_off      = udp_set_peek_off,
 741 #ifdef CONFIG_COMPAT
 742         .compat_ioctl      = inet6_compat_ioctl,
 743 #endif
 744 };
 745
 746 static const struct net_proto_family inet6_family_ops = {
 747         .family = PF_INET6,
 748         .create = inet6_create,
 749         .owner  = THIS_MODULE,
 750 };
 751
 752 int inet6_register_protosw(struct inet_protosw *p)
 753 {
 754         struct list_head *lh;
 755         struct inet_protosw *answer;
 756         struct list_head *last_perm;
 757         int protocol = p->protocol;
 758         int ret;
 759
 760         spin_lock_bh(&inetsw6_lock);
 761
 762         ret = -EINVAL;
 763         if (p->type >= SOCK_MAX)
 764                 goto out_illegal;
 765
 766         /* If we are trying to override a permanent protocol, bail. */
 767         answer = NULL;
 768         ret = -EPERM;
 769         last_perm = &inetsw6[p->type];
 770         list_for_each(lh, &inetsw6[p->type]) {
 771                 answer = list_entry(lh, struct inet_protosw, list);
 772
 773                 /* Check only the non-wild match. */
 774                 if (INET_PROTOSW_PERMANENT & answer->flags) {
 775                         if (protocol == answer->protocol)
 776                                 break;
 777                         last_perm = lh;
 778                 }
 779
 780                 answer = NULL;
 781         }
 782         if (answer)
 783                 goto out_permanent;
 784
 785         /* Add the new entry after the last permanent entry if any, so that
 786          * the new entry does not override a permanent entry when matched with
 787          * a wild-card protocol. But it is allowed to override any existing
 788          * non-permanent entry.  This means that when we remove this entry, the
 789          * system automatically returns to the old behavior.
 790          */
 791         list_add_rcu(&p->list, last_perm);
 792         ret = 0;
 793 out:
 794         spin_unlock_bh(&inetsw6_lock);
 795         return ret;
 796
 797 out_permanent:
 798         pr_err("Attempt to override permanent protocol %d\n", protocol);
 799         goto out;
 800
 801 out_illegal:
 802         pr_err("Ignoring attempt to register invalid socket type %d\n",
 803                p->type);
 804         goto out;
 805 }
 806 EXPORT_SYMBOL(inet6_register_protosw);
 807
 808 void
 809 inet6_unregister_protosw(struct inet_protosw *p)
 810 {
 811         if (INET_PROTOSW_PERMANENT & p->flags) {
 812                 pr_err("Attempt to unregister permanent protocol %d\n",
 813                        p->protocol);
 814         } else {
 815                 spin_lock_bh(&inetsw6_lock);
 816                 list_del_rcu(&p->list);
 817                 spin_unlock_bh(&inetsw6_lock);
 818
 819                 synchronize_net();
 820         }
 821 }
 822 EXPORT_SYMBOL(inet6_unregister_protosw);
 823
 824 int inet6_sk_rebuild_header(struct sock *sk)
 825 {
 826         struct ipv6_pinfo *np = inet6_sk(sk);
 827         struct dst_entry *dst;
 828
 829         dst = __sk_dst_check(sk, np->dst_cookie);
 830
 831         if (!dst) {
 832                 struct inet_sock *inet = inet_sk(sk);
 833                 struct in6_addr *final_p, final;
 834                 struct flowi6 fl6;
 835
 836                 memset(&fl6, 0, sizeof(fl6));
 837                 fl6.flowi6_proto = sk->sk_protocol;
 838                 fl6.daddr = sk->sk_v6_daddr;
 839                 fl6.saddr = np->saddr;
 840                 fl6.flowlabel = np->flow_label;
 841                 fl6.flowi6_oif = sk->sk_bound_dev_if;
 842                 fl6.flowi6_mark = sk->sk_mark;
 843                 fl6.fl6_dport = inet->inet_dport;
 844                 fl6.fl6_sport = inet->inet_sport;
 845                 fl6.flowi6_uid = sk->sk_uid;
 846                 security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6));
 847
 848                 rcu_read_lock();
 849                 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt),
 850                                          &final);
 851                 rcu_read_unlock();
 852
 853                 dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
 854                 if (IS_ERR(dst)) {
 855                         sk->sk_route_caps = 0;
 856                         WRITE_ONCE(sk->sk_err_soft, -PTR_ERR(dst));
 857                         return PTR_ERR(dst);
 858                 }
 859
 860                 ip6_dst_store(sk, dst, NULL, NULL);
 861         }
 862
 863         return 0;
 864 }
 865 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
 866
 867 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
 868                        const struct inet6_skb_parm *opt)
 869 {
 870         const struct ipv6_pinfo *np = inet6_sk(sk);
 871
 872         if (np->rxopt.all) {
 873                 if (((opt->flags & IP6SKB_HOPBYHOP) &&
 874                      (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) ||
 875                     (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) &&
 876                      np->rxopt.bits.rxflow) ||
 877                     (opt->srcrt && (np->rxopt.bits.srcrt ||
 878                      np->rxopt.bits.osrcrt)) ||
 879                     ((opt->dst1 || opt->dst0) &&
 880                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
 881                         return true;
 882         }
 883         return false;
 884 }
 885 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
 886
 887 static struct packet_type ipv6_packet_type __read_mostly = {
 888         .type = cpu_to_be16(ETH_P_IPV6),
 889         .func = ipv6_rcv,
 890         .list_func = ipv6_list_rcv,
 891 };
 892
 893 static int __init ipv6_packet_init(void)
 894 {
 895         dev_add_pack(&ipv6_packet_type);
 896         return 0;
 897 }
 898
 899 static void ipv6_packet_cleanup(void)
 900 {
 901         dev_remove_pack(&ipv6_packet_type);
 902 }
 903
 904 static int __net_init ipv6_init_mibs(struct net *net)
 905 {
 906         int i;
 907
 908         net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib);
 909         if (!net->mib.udp_stats_in6)
 910                 return -ENOMEM;
 911         net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib);
 912         if (!net->mib.udplite_stats_in6)
 913                 goto err_udplite_mib;
 914         net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib);
 915         if (!net->mib.ipv6_statistics)
 916                 goto err_ip_mib;
 917
 918         for_each_possible_cpu(i) {
 919                 struct ipstats_mib *af_inet6_stats;
 920                 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i);
 921                 u64_stats_init(&af_inet6_stats->syncp);
 922         }
 923
 924
 925         net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib);
 926         if (!net->mib.icmpv6_statistics)
 927                 goto err_icmp_mib;
 928         net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
 929                                                 GFP_KERNEL);
 930         if (!net->mib.icmpv6msg_statistics)
 931                 goto err_icmpmsg_mib;
 932         return 0;
 933
 934 err_icmpmsg_mib:
 935         free_percpu(net->mib.icmpv6_statistics);
 936 err_icmp_mib:
 937         free_percpu(net->mib.ipv6_statistics);
 938 err_ip_mib:
 939         free_percpu(net->mib.udplite_stats_in6);
 940 err_udplite_mib:
 941         free_percpu(net->mib.udp_stats_in6);
 942         return -ENOMEM;
 943 }
 944
 945 static void ipv6_cleanup_mibs(struct net *net)
 946 {
 947         free_percpu(net->mib.udp_stats_in6);
 948         free_percpu(net->mib.udplite_stats_in6);
 949         free_percpu(net->mib.ipv6_statistics);
 950         free_percpu(net->mib.icmpv6_statistics);
 951         kfree(net->mib.icmpv6msg_statistics);
 952 }
 953
 954 static int __net_init inet6_net_init(struct net *net)
 955 {
 956         int err = 0;
 957
 958         net->ipv6.sysctl.bindv6only = 0;
 959         net->ipv6.sysctl.icmpv6_time = 1*HZ;
 960         net->ipv6.sysctl.icmpv6_echo_ignore_all = 0;
 961         net->ipv6.sysctl.icmpv6_echo_ignore_multicast = 0;
 962         net->ipv6.sysctl.icmpv6_echo_ignore_anycast = 0;
 963         net->ipv6.sysctl.icmpv6_error_anycast_as_unicast = 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_gro_udp_encap_rcv = xfrm6_gro_udp_encap_rcv,
1058         .xfrm6_rcv_encap = xfrm6_rcv_encap,
1059 #endif
1060         .nd_tbl = &nd_tbl,
1061         .ipv6_fragment = ip6_fragment,
1062         .ipv6_dev_find = ipv6_dev_find,
1063 };
1064
1065 static const struct ipv6_bpf_stub ipv6_bpf_stub_impl = {
1066         .inet6_bind = __inet6_bind,
1067         .udp6_lib_lookup = __udp6_lib_lookup,
1068         .ipv6_setsockopt = do_ipv6_setsockopt,
1069         .ipv6_getsockopt = do_ipv6_getsockopt,
1070         .ipv6_dev_get_saddr = ipv6_dev_get_saddr,
1071 };
1072
1073 static int __init inet6_init(void)
1074 {
1075         struct list_head *r;
1076         int err = 0;
1077
1078         sock_skb_cb_check_size(sizeof(struct inet6_skb_parm));
1079
1080         /* Register the socket-side information for inet6_create.  */
1081         for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
1082                 INIT_LIST_HEAD(r);
1083
1084         raw_hashinfo_init(&raw_v6_hashinfo);
1085
1086         if (disable_ipv6_mod) {
1087                 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
1088                 goto out;
1089         }
1090
1091         err = proto_register(&tcpv6_prot, 1);
1092         if (err)
1093                 goto out;
1094
1095         err = proto_register(&udpv6_prot, 1);
1096         if (err)
1097                 goto out_unregister_tcp_proto;
1098
1099         err = proto_register(&udplitev6_prot, 1);
1100         if (err)
1101                 goto out_unregister_udp_proto;
1102
1103         err = proto_register(&rawv6_prot, 1);
1104         if (err)
1105                 goto out_unregister_udplite_proto;
1106
1107         err = proto_register(&pingv6_prot, 1);
1108         if (err)
1109                 goto out_unregister_raw_proto;
1110
1111         /* We MUST register RAW sockets before we create the ICMP6,
1112          * IGMP6, or NDISC control sockets.
1113          */
1114         err = rawv6_init();
1115         if (err)
1116                 goto out_unregister_ping_proto;
1117
1118         /* Register the family here so that the init calls below will
1119          * be able to create sockets. (?? is this dangerous ??)
1120          */
1121         err = sock_register(&inet6_family_ops);
1122         if (err)
1123                 goto out_sock_register_fail;
1124
1125         /*
1126          *      ipngwg API draft makes clear that the correct semantics
1127          *      for TCP and UDP is to consider one TCP and UDP instance
1128          *      in a host available by both INET and INET6 APIs and
1129          *      able to communicate via both network protocols.
1130          */
1131
1132         err = register_pernet_subsys(&inet6_net_ops);
1133         if (err)
1134                 goto register_pernet_fail;
1135         err = ip6_mr_init();
1136         if (err)
1137                 goto ipmr_fail;
1138         err = icmpv6_init();
1139         if (err)
1140                 goto icmp_fail;
1141         err = ndisc_init();
1142         if (err)
1143                 goto ndisc_fail;
1144         err = igmp6_init();
1145         if (err)
1146                 goto igmp_fail;
1147
1148         err = ipv6_netfilter_init();
1149         if (err)
1150                 goto netfilter_fail;
1151         /* Create /proc/foo6 entries. */
1152 #ifdef CONFIG_PROC_FS
1153         err = -ENOMEM;
1154         if (raw6_proc_init())
1155                 goto proc_raw6_fail;
1156         if (udplite6_proc_init())
1157                 goto proc_udplite6_fail;
1158         if (ipv6_misc_proc_init())
1159                 goto proc_misc6_fail;
1160         if (if6_proc_init())
1161                 goto proc_if6_fail;
1162 #endif
1163         err = ip6_route_init();
1164         if (err)
1165                 goto ip6_route_fail;
1166         err = ndisc_late_init();
1167         if (err)
1168                 goto ndisc_late_fail;
1169         err = ip6_flowlabel_init();
1170         if (err)
1171                 goto ip6_flowlabel_fail;
1172         err = ipv6_anycast_init();
1173         if (err)
1174                 goto ipv6_anycast_fail;
1175         err = addrconf_init();
1176         if (err)
1177                 goto addrconf_fail;
1178
1179         /* Init v6 extension headers. */
1180         err = ipv6_exthdrs_init();
1181         if (err)
1182                 goto ipv6_exthdrs_fail;
1183
1184         err = ipv6_frag_init();
1185         if (err)
1186                 goto ipv6_frag_fail;
1187
1188         /* Init v6 transport protocols. */
1189         err = udpv6_init();
1190         if (err)
1191                 goto udpv6_fail;
1192
1193         err = udplitev6_init();
1194         if (err)
1195                 goto udplitev6_fail;
1196
1197         err = udpv6_offload_init();
1198         if (err)
1199                 goto udpv6_offload_fail;
1200
1201         err = tcpv6_init();
1202         if (err)
1203                 goto tcpv6_fail;
1204
1205         err = ipv6_packet_init();
1206         if (err)
1207                 goto ipv6_packet_fail;
1208
1209         err = pingv6_init();
1210         if (err)
1211                 goto pingv6_fail;
1212
1213         err = calipso_init();
1214         if (err)
1215                 goto calipso_fail;
1216
1217         err = seg6_init();
1218         if (err)
1219                 goto seg6_fail;
1220
1221         err = rpl_init();
1222         if (err)
1223                 goto rpl_fail;
1224
1225         err = ioam6_init();
1226         if (err)
1227                 goto ioam6_fail;
1228
1229         err = igmp6_late_init();
1230         if (err)
1231                 goto igmp6_late_err;
1232
1233 #ifdef CONFIG_SYSCTL
1234         err = ipv6_sysctl_register();
1235         if (err)
1236                 goto sysctl_fail;
1237 #endif
1238
1239         /* ensure that ipv6 stubs are visible only after ipv6 is ready */
1240         wmb();
1241         ipv6_stub = &ipv6_stub_impl;
1242         ipv6_bpf_stub = &ipv6_bpf_stub_impl;
1243 out:
1244         return err;
1245
1246 #ifdef CONFIG_SYSCTL
1247 sysctl_fail:
1248         igmp6_late_cleanup();
1249 #endif
1250 igmp6_late_err:
1251         ioam6_exit();
1252 ioam6_fail:
1253         rpl_exit();
1254 rpl_fail:
1255         seg6_exit();
1256 seg6_fail:
1257         calipso_exit();
1258 calipso_fail:
1259         pingv6_exit();
1260 pingv6_fail:
1261         ipv6_packet_cleanup();
1262 ipv6_packet_fail:
1263         tcpv6_exit();
1264 tcpv6_fail:
1265         udpv6_offload_exit();
1266 udpv6_offload_fail:
1267         udplitev6_exit();
1268 udplitev6_fail:
1269         udpv6_exit();
1270 udpv6_fail:
1271         ipv6_frag_exit();
1272 ipv6_frag_fail:
1273         ipv6_exthdrs_exit();
1274 ipv6_exthdrs_fail:
1275         addrconf_cleanup();
1276 addrconf_fail:
1277         ipv6_anycast_cleanup();
1278 ipv6_anycast_fail:
1279         ip6_flowlabel_cleanup();
1280 ip6_flowlabel_fail:
1281         ndisc_late_cleanup();
1282 ndisc_late_fail:
1283         ip6_route_cleanup();
1284 ip6_route_fail:
1285 #ifdef CONFIG_PROC_FS
1286         if6_proc_exit();
1287 proc_if6_fail:
1288         ipv6_misc_proc_exit();
1289 proc_misc6_fail:
1290         udplite6_proc_exit();
1291 proc_udplite6_fail:
1292         raw6_proc_exit();
1293 proc_raw6_fail:
1294 #endif
1295         ipv6_netfilter_fini();
1296 netfilter_fail:
1297         igmp6_cleanup();
1298 igmp_fail:
1299         ndisc_cleanup();
1300 ndisc_fail:
1301         icmpv6_cleanup();
1302 icmp_fail:
1303         ip6_mr_cleanup();
1304 ipmr_fail:
1305         unregister_pernet_subsys(&inet6_net_ops);
1306 register_pernet_fail:
1307         sock_unregister(PF_INET6);
1308         rtnl_unregister_all(PF_INET6);
1309 out_sock_register_fail:
1310         rawv6_exit();
1311 out_unregister_ping_proto:
1312         proto_unregister(&pingv6_prot);
1313 out_unregister_raw_proto:
1314         proto_unregister(&rawv6_prot);
1315 out_unregister_udplite_proto:
1316         proto_unregister(&udplitev6_prot);
1317 out_unregister_udp_proto:
1318         proto_unregister(&udpv6_prot);
1319 out_unregister_tcp_proto:
1320         proto_unregister(&tcpv6_prot);
1321         goto out;
1322 }
1323 module_init(inet6_init);
1324
1325 MODULE_ALIAS_NETPROTO(PF_INET6);