net/ipv6/af_inet6.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *      PF_INET6 socket protocol family
   4  *      Linux INET6 implementation
   5  *
   6  *      Authors:
   7  *      Pedro Roque             <roque@di.fc.ul.pt>
   8  *
   9  *      Adapted from linux/net/ipv4/af_inet.c
  10  *
  11  *      Fixes:
  12  *      piggy, Karl Knutson     :       Socket protocol table
  13  *      Hideaki YOSHIFUJI       :       sin6_scope_id support
  14  *      Arnaldo Melo            :       check proc_net_create return, cleanups
  15  */
  16
  17 #define pr_fmt(fmt) "IPv6: " fmt
  18
  19 #include <linux/module.h>
  20 #include <linux/capability.h>
  21 #include <linux/errno.h>
  22 #include <linux/types.h>
  23 #include <linux/socket.h>
  24 #include <linux/in.h>
  25 #include <linux/kernel.h>
  26 #include <linux/timer.h>
  27 #include <linux/string.h>
  28 #include <linux/sockios.h>
  29 #include <linux/net.h>
  30 #include <linux/fcntl.h>
  31 #include <linux/mm.h>
  32 #include <linux/interrupt.h>
  33 #include <linux/proc_fs.h>
  34 #include <linux/stat.h>
  35 #include <linux/init.h>
  36 #include <linux/slab.h>
  37
  38 #include <linux/inet.h>
  39 #include <linux/netdevice.h>
  40 #include <linux/icmpv6.h>
  41 #include <linux/netfilter_ipv6.h>
  42
  43 #include <net/ip.h>
  44 #include <net/ipv6.h>
  45 #include <net/udp.h>
  46 #include <net/udplite.h>
  47 #include <net/tcp.h>
  48 #include <net/ping.h>
  49 #include <net/protocol.h>
  50 #include <net/inet_common.h>
  51 #include <net/route.h>
  52 #include <net/transp_v6.h>
  53 #include <net/ip6_route.h>
  54 #include <net/addrconf.h>
  55 #include <net/ipv6_stubs.h>
  56 #include <net/ndisc.h>
  57 #ifdef CONFIG_IPV6_TUNNEL
  58 #include <net/ip6_tunnel.h>
  59 #endif
  60 #include <net/calipso.h>
  61 #include <net/seg6.h>
  62 #include <net/rpl.h>
  63 #include <net/compat.h>
  64 #include <net/xfrm.h>
  65 #include <net/ioam6.h>
  66 #include <net/rawv6.h>
  67
  68 #include <linux/uaccess.h>
  69 #include <linux/mroute6.h>
  70
  71 #include "ip6_offload.h"
  72
  73 MODULE_AUTHOR("Cast of dozens");
  74 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
  75 MODULE_LICENSE("GPL");
  76
  77 /* The inetsw6 table contains everything that inet6_create needs to
  78  * build a new socket.
  79  */
  80 static struct list_head inetsw6[SOCK_MAX];
  81 static DEFINE_SPINLOCK(inetsw6_lock);
  82
  83 struct ipv6_params ipv6_defaults = {
  84         .disable_ipv6 = 0,
  85         .autoconf = 1,
  86 };
  87
  88 static int disable_ipv6_mod;
  89
  90 module_param_named(disable, disable_ipv6_mod, int, 0444);
  91 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
  92
  93 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
  94 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
  95
  96 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
  97 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
  98
  99 bool ipv6_mod_enabled(void)
 100 {
 101         return disable_ipv6_mod == 0;
 102 }
 103 EXPORT_SYMBOL_GPL(ipv6_mod_enabled);
 104
 105 static struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
 106 {
 107         const int offset = sk->sk_prot->ipv6_pinfo_offset;
 108
 109         return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
 110 }
 111
 112 void inet6_sock_destruct(struct sock *sk)
 113 {
 114         inet6_cleanup_sock(sk);
 115         inet_sock_destruct(sk);
 116 }
 117 EXPORT_SYMBOL_GPL(inet6_sock_destruct);
 118
 119 static int inet6_create(struct net *net, struct socket *sock, int protocol,
 120                         int kern)
 121 {
 122         struct inet_sock *inet;
 123         struct ipv6_pinfo *np;
 124         struct sock *sk;
 125         struct inet_protosw *answer;
 126         struct proto *answer_prot;
 127         unsigned char answer_flags;
 128         int try_loading_module = 0;
 129         int err;
 130
 131         if (protocol < 0 || protocol >= IPPROTO_MAX)
 132                 return -EINVAL;
 133
 134         /* Look for the requested type/protocol pair. */
 135 lookup_protocol:
 136         err = -ESOCKTNOSUPPORT;
 137         rcu_read_lock();
 138         list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
 139
 140                 err = 0;
 141                 /* Check the non-wild match. */
 142                 if (protocol == answer->protocol) {
 143                         if (protocol != IPPROTO_IP)
 144                                 break;
 145                 } else {
 146                         /* Check for the two wild cases. */
 147                         if (IPPROTO_IP == protocol) {
 148                                 protocol = answer->protocol;
 149                                 break;
 150                         }
 151                         if (IPPROTO_IP == answer->protocol)
 152                                 break;
 153                 }
 154                 err = -EPROTONOSUPPORT;
 155         }
 156
 157         if (err) {
 158                 if (try_loading_module < 2) {
 159                         rcu_read_unlock();
 160                         /*
 161                          * Be more specific, e.g. net-pf-10-proto-132-type-1
 162                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
 163                          */
 164                         if (++try_loading_module == 1)
 165                                 request_module("net-pf-%d-proto-%d-type-%d",
 166                                                 PF_INET6, protocol, sock->type);
 167                         /*
 168                          * Fall back to generic, e.g. net-pf-10-proto-132
 169                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
 170                          */
 171                         else
 172                                 request_module("net-pf-%d-proto-%d",
 173                                                 PF_INET6, protocol);
 174                         goto lookup_protocol;
 175                 } else
 176                         goto out_rcu_unlock;
 177         }
 178
 179         err = -EPERM;
 180         if (sock->type == SOCK_RAW && !kern &&
 181             !ns_capable(net->user_ns, CAP_NET_RAW))
 182                 goto out_rcu_unlock;
 183
 184         sock->ops = answer->ops;
 185         answer_prot = answer->prot;
 186         answer_flags = answer->flags;
 187         rcu_read_unlock();
 188
 189         WARN_ON(!answer_prot->slab);
 190
 191         err = -ENOBUFS;
 192         sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern);
 193         if (!sk)
 194                 goto out;
 195
 196         sock_init_data(sock, sk);
 197
 198         err = 0;
 199         if (INET_PROTOSW_REUSE & answer_flags)
 200                 sk->sk_reuse = SK_CAN_REUSE;
 201
 202         inet = inet_sk(sk);
 203         inet_assign_bit(IS_ICSK, sk, INET_PROTOSW_ICSK & answer_flags);
 204
 205         if (SOCK_RAW == sock->type) {
 206                 inet->inet_num = protocol;
 207                 if (IPPROTO_RAW == protocol)
 208                         inet_set_bit(HDRINCL, sk);
 209         }
 210
 211         sk->sk_destruct         = inet6_sock_destruct;
 212         sk->sk_family           = PF_INET6;
 213         sk->sk_protocol         = protocol;
 214
 215         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
 216
 217         inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
 218         np->hop_limit   = -1;
 219         np->mcast_hops  = IPV6_DEFAULT_MCASTHOPS;
 220         inet6_set_bit(MC6_LOOP, sk);
 221         inet6_set_bit(MC6_ALL, sk);
 222         np->pmtudisc    = IPV6_PMTUDISC_WANT;
 223         inet6_assign_bit(REPFLOW, sk, net->ipv6.sysctl.flowlabel_reflect &
 224                                      FLOWLABEL_REFLECT_ESTABLISHED);
 225         sk->sk_ipv6only = net->ipv6.sysctl.bindv6only;
 226         sk->sk_txrehash = READ_ONCE(net->core.sysctl_txrehash);
 227
 228         /* Init the ipv4 part of the socket since we can have sockets
 229          * using v6 API for ipv4.
 230          */
 231         inet->uc_ttl    = -1;
 232
 233         inet_set_bit(MC_LOOP, sk);
 234         inet->mc_ttl    = 1;
 235         inet->mc_index  = 0;
 236         RCU_INIT_POINTER(inet->mc_list, NULL);
 237         inet->rcv_tos   = 0;
 238
 239         if (READ_ONCE(net->ipv4.sysctl_ip_no_pmtu_disc))
 240                 inet->pmtudisc = IP_PMTUDISC_DONT;
 241         else
 242                 inet->pmtudisc = IP_PMTUDISC_WANT;
 243
 244         if (inet->inet_num) {
 245                 /* It assumes that any protocol which allows
 246                  * the user to assign a number at socket
 247                  * creation time automatically shares.
 248                  */
 249                 inet->inet_sport = htons(inet->inet_num);
 250                 err = sk->sk_prot->hash(sk);
 251                 if (err) {
 252                         sk_common_release(sk);
 253                         goto out;
 254                 }
 255         }
 256         if (sk->sk_prot->init) {
 257                 err = sk->sk_prot->init(sk);
 258                 if (err) {
 259                         sk_common_release(sk);
 260                         goto out;
 261                 }
 262         }
 263
 264         if (!kern) {
 265                 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
 266                 if (err) {
 267                         sk_common_release(sk);
 268                         goto out;
 269                 }
 270         }
 271 out:
 272         return err;
 273 out_rcu_unlock:
 274         rcu_read_unlock();
 275         goto out;
 276 }
 277
 278 static int __inet6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
 279                         u32 flags)
 280 {
 281         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
 282         struct inet_sock *inet = inet_sk(sk);
 283         struct ipv6_pinfo *np = inet6_sk(sk);
 284         struct net *net = sock_net(sk);
 285         __be32 v4addr = 0;
 286         unsigned short snum;
 287         bool saved_ipv6only;
 288         int addr_type = 0;
 289         int err = 0;
 290
 291         if (addr->sin6_family != AF_INET6)
 292                 return -EAFNOSUPPORT;
 293
 294         addr_type = ipv6_addr_type(&addr->sin6_addr);
 295         if ((addr_type & IPV6_ADDR_MULTICAST) && sk->sk_type == SOCK_STREAM)
 296                 return -EINVAL;
 297
 298         snum = ntohs(addr->sin6_port);
 299         if (!(flags & BIND_NO_CAP_NET_BIND_SERVICE) &&
 300             snum && inet_port_requires_bind_service(net, snum) &&
 301             !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
 302                 return -EACCES;
 303
 304         if (flags & BIND_WITH_LOCK)
 305                 lock_sock(sk);
 306
 307         /* Check these errors (active socket, double bind). */
 308         if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
 309                 err = -EINVAL;
 310                 goto out;
 311         }
 312
 313         /* Check if the address belongs to the host. */
 314         if (addr_type == IPV6_ADDR_MAPPED) {
 315                 struct net_device *dev = NULL;
 316                 int chk_addr_ret;
 317
 318                 /* Binding to v4-mapped address on a v6-only socket
 319                  * makes no sense
 320                  */
 321                 if (ipv6_only_sock(sk)) {
 322                         err = -EINVAL;
 323                         goto out;
 324                 }
 325
 326                 rcu_read_lock();
 327                 if (sk->sk_bound_dev_if) {
 328                         dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
 329                         if (!dev) {
 330                                 err = -ENODEV;
 331                                 goto out_unlock;
 332                         }
 333                 }
 334
 335                 /* Reproduce AF_INET checks to make the bindings consistent */
 336                 v4addr = addr->sin6_addr.s6_addr32[3];
 337                 chk_addr_ret = inet_addr_type_dev_table(net, dev, v4addr);
 338                 rcu_read_unlock();
 339
 340                 if (!inet_addr_valid_or_nonlocal(net, inet, v4addr,
 341                                                  chk_addr_ret)) {
 342                         err = -EADDRNOTAVAIL;
 343                         goto out;
 344                 }
 345         } else {
 346                 if (addr_type != IPV6_ADDR_ANY) {
 347                         struct net_device *dev = NULL;
 348
 349                         rcu_read_lock();
 350                         if (__ipv6_addr_needs_scope_id(addr_type)) {
 351                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 352                                     addr->sin6_scope_id) {
 353                                         /* Override any existing binding, if another one
 354                                          * is supplied by user.
 355                                          */
 356                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
 357                                 }
 358
 359                                 /* Binding to link-local address requires an interface */
 360                                 if (!sk->sk_bound_dev_if) {
 361                                         err = -EINVAL;
 362                                         goto out_unlock;
 363                                 }
 364                         }
 365
 366                         if (sk->sk_bound_dev_if) {
 367                                 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
 368                                 if (!dev) {
 369                                         err = -ENODEV;
 370                                         goto out_unlock;
 371                                 }
 372                         }
 373
 374                         /* ipv4 addr of the socket is invalid.  Only the
 375                          * unspecified and mapped address have a v4 equivalent.
 376                          */
 377                         v4addr = LOOPBACK4_IPV6;
 378                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
 379                                 if (!ipv6_can_nonlocal_bind(net, inet) &&
 380                                     !ipv6_chk_addr(net, &addr->sin6_addr,
 381                                                    dev, 0)) {
 382                                         err = -EADDRNOTAVAIL;
 383                                         goto out_unlock;
 384                                 }
 385                         }
 386                         rcu_read_unlock();
 387                 }
 388         }
 389
 390         inet->inet_rcv_saddr = v4addr;
 391         inet->inet_saddr = v4addr;
 392
 393         sk->sk_v6_rcv_saddr = addr->sin6_addr;
 394
 395         if (!(addr_type & IPV6_ADDR_MULTICAST))
 396                 np->saddr = addr->sin6_addr;
 397
 398         saved_ipv6only = sk->sk_ipv6only;
 399         if (addr_type != IPV6_ADDR_ANY && addr_type != IPV6_ADDR_MAPPED)
 400                 sk->sk_ipv6only = 1;
 401
 402         /* Make sure we are allowed to bind here. */
 403         if (snum || !(inet_test_bit(BIND_ADDRESS_NO_PORT, sk) ||
 404                       (flags & BIND_FORCE_ADDRESS_NO_PORT))) {
 405                 err = sk->sk_prot->get_port(sk, snum);
 406                 if (err) {
 407                         sk->sk_ipv6only = saved_ipv6only;
 408                         inet_reset_saddr(sk);
 409                         goto out;
 410                 }
 411                 if (!(flags & BIND_FROM_BPF)) {
 412                         err = BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk);
 413                         if (err) {
 414                                 sk->sk_ipv6only = saved_ipv6only;
 415                                 inet_reset_saddr(sk);
 416                                 if (sk->sk_prot->put_port)
 417                                         sk->sk_prot->put_port(sk);
 418                                 goto out;
 419                         }
 420                 }
 421         }
 422
 423         if (addr_type != IPV6_ADDR_ANY)
 424                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
 425         if (snum)
 426                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
 427         inet->inet_sport = htons(inet->inet_num);
 428         inet->inet_dport = 0;
 429         inet->inet_daddr = 0;
 430 out:
 431         if (flags & BIND_WITH_LOCK)
 432                 release_sock(sk);
 433         return err;
 434 out_unlock:
 435         rcu_read_unlock();
 436         goto out;
 437 }
 438
 439 int inet6_bind_sk(struct sock *sk, struct sockaddr *uaddr, int addr_len)
 440 {
 441         u32 flags = BIND_WITH_LOCK;
 442         const struct proto *prot;
 443         int err = 0;
 444
 445         /* IPV6_ADDRFORM can change sk->sk_prot under us. */
 446         prot = READ_ONCE(sk->sk_prot);
 447         /* If the socket has its own bind function then use it. */
 448         if (prot->bind)
 449                 return prot->bind(sk, uaddr, addr_len);
 450
 451         if (addr_len < SIN6_LEN_RFC2133)
 452                 return -EINVAL;
 453
 454         /* BPF prog is run before any checks are done so that if the prog
 455          * changes context in a wrong way it will be caught.
 456          */
 457         err = BPF_CGROUP_RUN_PROG_INET_BIND_LOCK(sk, uaddr, &addr_len,
 458                                                  CGROUP_INET6_BIND, &flags);
 459         if (err)
 460                 return err;
 461
 462         return __inet6_bind(sk, uaddr, addr_len, flags);
 463 }
 464
 465 /* bind for INET6 API */
 466 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 467 {
 468         return inet6_bind_sk(sock->sk, uaddr, addr_len);
 469 }
 470 EXPORT_SYMBOL(inet6_bind);
 471
 472 int inet6_release(struct socket *sock)
 473 {
 474         struct sock *sk = sock->sk;
 475
 476         if (!sk)
 477                 return -EINVAL;
 478
 479         /* Free mc lists */
 480         ipv6_sock_mc_close(sk);
 481
 482         /* Free ac lists */
 483         ipv6_sock_ac_close(sk);
 484
 485         return inet_release(sock);
 486 }
 487 EXPORT_SYMBOL(inet6_release);
 488
 489 void inet6_cleanup_sock(struct sock *sk)
 490 {
 491         struct ipv6_pinfo *np = inet6_sk(sk);
 492         struct sk_buff *skb;
 493         struct ipv6_txoptions *opt;
 494
 495         /* Release rx options */
 496
 497         skb = xchg(&np->pktoptions, NULL);
 498         kfree_skb(skb);
 499
 500         skb = xchg(&np->rxpmtu, NULL);
 501         kfree_skb(skb);
 502
 503         /* Free flowlabels */
 504         fl6_free_socklist(sk);
 505
 506         /* Free tx options */
 507
 508         opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL);
 509         if (opt) {
 510                 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 511                 txopt_put(opt);
 512         }
 513 }
 514 EXPORT_SYMBOL_GPL(inet6_cleanup_sock);
 515
 516 /*
 517  *      This does both peername and sockname.
 518  */
 519 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 520                   int peer)
 521 {
 522         struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
 523         int sin_addr_len = sizeof(*sin);
 524         struct sock *sk = sock->sk;
 525         struct inet_sock *inet = inet_sk(sk);
 526         struct ipv6_pinfo *np = inet6_sk(sk);
 527
 528         sin->sin6_family = AF_INET6;
 529         sin->sin6_flowinfo = 0;
 530         sin->sin6_scope_id = 0;
 531         lock_sock(sk);
 532         if (peer) {
 533                 if (!inet->inet_dport ||
 534                     (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
 535                     peer == 1)) {
 536                         release_sock(sk);
 537                         return -ENOTCONN;
 538                 }
 539                 sin->sin6_port = inet->inet_dport;
 540                 sin->sin6_addr = sk->sk_v6_daddr;
 541                 if (inet6_test_bit(SNDFLOW, sk))
 542                         sin->sin6_flowinfo = np->flow_label;
 543                 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin, &sin_addr_len,
 544                                        CGROUP_INET6_GETPEERNAME);
 545         } else {
 546                 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
 547                         sin->sin6_addr = np->saddr;
 548                 else
 549                         sin->sin6_addr = sk->sk_v6_rcv_saddr;
 550                 sin->sin6_port = inet->inet_sport;
 551                 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin, &sin_addr_len,
 552                                        CGROUP_INET6_GETSOCKNAME);
 553         }
 554         sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
 555                                                  sk->sk_bound_dev_if);
 556         release_sock(sk);
 557         return sin_addr_len;
 558 }
 559 EXPORT_SYMBOL(inet6_getname);
 560
 561 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 562 {
 563         void __user *argp = (void __user *)arg;
 564         struct sock *sk = sock->sk;
 565         struct net *net = sock_net(sk);
 566         const struct proto *prot;
 567
 568         switch (cmd) {
 569         case SIOCADDRT:
 570         case SIOCDELRT: {
 571                 struct in6_rtmsg rtmsg;
 572
 573                 if (copy_from_user(&rtmsg, argp, sizeof(rtmsg)))
 574                         return -EFAULT;
 575                 return ipv6_route_ioctl(net, cmd, &rtmsg);
 576         }
 577         case SIOCSIFADDR:
 578                 return addrconf_add_ifaddr(net, argp);
 579         case SIOCDIFADDR:
 580                 return addrconf_del_ifaddr(net, argp);
 581         case SIOCSIFDSTADDR:
 582                 return addrconf_set_dstaddr(net, argp);
 583         default:
 584                 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
 585                 prot = READ_ONCE(sk->sk_prot);
 586                 if (!prot->ioctl)
 587                         return -ENOIOCTLCMD;
 588                 return sk_ioctl(sk, cmd, (void __user *)arg);
 589         }
 590         /*NOTREACHED*/
 591         return 0;
 592 }
 593 EXPORT_SYMBOL(inet6_ioctl);
 594
 595 #ifdef CONFIG_COMPAT
 596 struct compat_in6_rtmsg {
 597         struct in6_addr         rtmsg_dst;
 598         struct in6_addr         rtmsg_src;
 599         struct in6_addr         rtmsg_gateway;
 600         u32                     rtmsg_type;
 601         u16                     rtmsg_dst_len;
 602         u16                     rtmsg_src_len;
 603         u32                     rtmsg_metric;
 604         u32                     rtmsg_info;
 605         u32                     rtmsg_flags;
 606         s32                     rtmsg_ifindex;
 607 };
 608
 609 static int inet6_compat_routing_ioctl(struct sock *sk, unsigned int cmd,
 610                 struct compat_in6_rtmsg __user *ur)
 611 {
 612         struct in6_rtmsg rt;
 613
 614         if (copy_from_user(&rt.rtmsg_dst, &ur->rtmsg_dst,
 615                         3 * sizeof(struct in6_addr)) ||
 616             get_user(rt.rtmsg_type, &ur->rtmsg_type) ||
 617             get_user(rt.rtmsg_dst_len, &ur->rtmsg_dst_len) ||
 618             get_user(rt.rtmsg_src_len, &ur->rtmsg_src_len) ||
 619             get_user(rt.rtmsg_metric, &ur->rtmsg_metric) ||
 620             get_user(rt.rtmsg_info, &ur->rtmsg_info) ||
 621             get_user(rt.rtmsg_flags, &ur->rtmsg_flags) ||
 622             get_user(rt.rtmsg_ifindex, &ur->rtmsg_ifindex))
 623                 return -EFAULT;
 624
 625
 626         return ipv6_route_ioctl(sock_net(sk), cmd, &rt);
 627 }
 628
 629 int inet6_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 630 {
 631         void __user *argp = compat_ptr(arg);
 632         struct sock *sk = sock->sk;
 633
 634         switch (cmd) {
 635         case SIOCADDRT:
 636         case SIOCDELRT:
 637                 return inet6_compat_routing_ioctl(sk, cmd, argp);
 638         default:
 639                 return -ENOIOCTLCMD;
 640         }
 641 }
 642 EXPORT_SYMBOL_GPL(inet6_compat_ioctl);
 643 #endif /* CONFIG_COMPAT */
 644
 645 INDIRECT_CALLABLE_DECLARE(int udpv6_sendmsg(struct sock *, struct msghdr *,
 646                                             size_t));
 647 int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
 648 {
 649         struct sock *sk = sock->sk;
 650         const struct proto *prot;
 651
 652         if (unlikely(inet_send_prepare(sk)))
 653                 return -EAGAIN;
 654
 655         /* IPV6_ADDRFORM can change sk->sk_prot under us. */
 656         prot = READ_ONCE(sk->sk_prot);
 657         return INDIRECT_CALL_2(prot->sendmsg, tcp_sendmsg, udpv6_sendmsg,
 658                                sk, msg, size);
 659 }
 660
 661 INDIRECT_CALLABLE_DECLARE(int udpv6_recvmsg(struct sock *, struct msghdr *,
 662                                             size_t, int, int *));
 663 int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
 664                   int flags)
 665 {
 666         struct sock *sk = sock->sk;
 667         const struct proto *prot;
 668         int addr_len = 0;
 669         int err;
 670
 671         if (likely(!(flags & MSG_ERRQUEUE)))
 672                 sock_rps_record_flow(sk);
 673
 674         /* IPV6_ADDRFORM can change sk->sk_prot under us. */
 675         prot = READ_ONCE(sk->sk_prot);
 676         err = INDIRECT_CALL_2(prot->recvmsg, tcp_recvmsg, udpv6_recvmsg,
 677                               sk, msg, size, flags, &addr_len);
 678         if (err >= 0)
 679                 msg->msg_namelen = addr_len;
 680         return err;
 681 }
 682
 683 const struct proto_ops inet6_stream_ops = {
 684         .family            = PF_INET6,
 685         .owner             = THIS_MODULE,
 686         .release           = inet6_release,
 687         .bind              = inet6_bind,
 688         .connect           = inet_stream_connect,       /* ok           */
 689         .socketpair        = sock_no_socketpair,        /* a do nothing */
 690         .accept            = inet_accept,               /* ok           */
 691         .getname           = inet6_getname,
 692         .poll              = tcp_poll,                  /* ok           */
 693         .ioctl             = inet6_ioctl,               /* must change  */
 694         .gettstamp         = sock_gettstamp,
 695         .listen            = inet_listen,               /* ok           */
 696         .shutdown          = inet_shutdown,             /* ok           */
 697         .setsockopt        = sock_common_setsockopt,    /* ok           */
 698         .getsockopt        = sock_common_getsockopt,    /* ok           */
 699         .sendmsg           = inet6_sendmsg,             /* retpoline's sake */
 700         .recvmsg           = inet6_recvmsg,             /* retpoline's sake */
 701 #ifdef CONFIG_MMU
 702         .mmap              = tcp_mmap,
 703 #endif
 704         .splice_eof        = inet_splice_eof,
 705         .sendmsg_locked    = tcp_sendmsg_locked,
 706         .splice_read       = tcp_splice_read,
 707         .read_sock         = tcp_read_sock,
 708         .read_skb          = tcp_read_skb,
 709         .peek_len          = tcp_peek_len,
 710 #ifdef CONFIG_COMPAT
 711         .compat_ioctl      = inet6_compat_ioctl,
 712 #endif
 713         .set_rcvlowat      = tcp_set_rcvlowat,
 714 };
 715
 716 const struct proto_ops inet6_dgram_ops = {
 717         .family            = PF_INET6,
 718         .owner             = THIS_MODULE,
 719         .release           = inet6_release,
 720         .bind              = inet6_bind,
 721         .connect           = inet_dgram_connect,        /* ok           */
 722         .socketpair        = sock_no_socketpair,        /* a do nothing */
 723         .accept            = sock_no_accept,            /* a do nothing */
 724         .getname           = inet6_getname,
 725         .poll              = udp_poll,                  /* ok           */
 726         .ioctl             = inet6_ioctl,               /* must change  */
 727         .gettstamp         = sock_gettstamp,
 728         .listen            = sock_no_listen,            /* ok           */
 729         .shutdown          = inet_shutdown,             /* ok           */
 730         .setsockopt        = sock_common_setsockopt,    /* ok           */
 731         .getsockopt        = sock_common_getsockopt,    /* ok           */
 732         .sendmsg           = inet6_sendmsg,             /* retpoline's sake */
 733         .recvmsg           = inet6_recvmsg,             /* retpoline's sake */
 734         .read_skb          = udp_read_skb,
 735         .mmap              = sock_no_mmap,
 736         .set_peek_off      = sk_set_peek_off,
 737 #ifdef CONFIG_COMPAT
 738         .compat_ioctl      = inet6_compat_ioctl,
 739 #endif
 740 };
 741
 742 static const struct net_proto_family inet6_family_ops = {
 743         .family = PF_INET6,
 744         .create = inet6_create,
 745         .owner  = THIS_MODULE,
 746 };
 747
 748 int inet6_register_protosw(struct inet_protosw *p)
 749 {
 750         struct list_head *lh;
 751         struct inet_protosw *answer;
 752         struct list_head *last_perm;
 753         int protocol = p->protocol;
 754         int ret;
 755
 756         spin_lock_bh(&inetsw6_lock);
 757
 758         ret = -EINVAL;
 759         if (p->type >= SOCK_MAX)
 760                 goto out_illegal;
 761
 762         /* If we are trying to override a permanent protocol, bail. */
 763         answer = NULL;
 764         ret = -EPERM;
 765         last_perm = &inetsw6[p->type];
 766         list_for_each(lh, &inetsw6[p->type]) {
 767                 answer = list_entry(lh, struct inet_protosw, list);
 768
 769                 /* Check only the non-wild match. */
 770                 if (INET_PROTOSW_PERMANENT & answer->flags) {
 771                         if (protocol == answer->protocol)
 772                                 break;
 773                         last_perm = lh;
 774                 }
 775
 776                 answer = NULL;
 777         }
 778         if (answer)
 779                 goto out_permanent;
 780
 781         /* Add the new entry after the last permanent entry if any, so that
 782          * the new entry does not override a permanent entry when matched with
 783          * a wild-card protocol. But it is allowed to override any existing
 784          * non-permanent entry.  This means that when we remove this entry, the
 785          * system automatically returns to the old behavior.
 786          */
 787         list_add_rcu(&p->list, last_perm);
 788         ret = 0;
 789 out:
 790         spin_unlock_bh(&inetsw6_lock);
 791         return ret;
 792
 793 out_permanent:
 794         pr_err("Attempt to override permanent protocol %d\n", protocol);
 795         goto out;
 796
 797 out_illegal:
 798         pr_err("Ignoring attempt to register invalid socket type %d\n",
 799                p->type);
 800         goto out;
 801 }
 802 EXPORT_SYMBOL(inet6_register_protosw);
 803
 804 void
 805 inet6_unregister_protosw(struct inet_protosw *p)
 806 {
 807         if (INET_PROTOSW_PERMANENT & p->flags) {
 808                 pr_err("Attempt to unregister permanent protocol %d\n",
 809                        p->protocol);
 810         } else {
 811                 spin_lock_bh(&inetsw6_lock);
 812                 list_del_rcu(&p->list);
 813                 spin_unlock_bh(&inetsw6_lock);
 814
 815                 synchronize_net();
 816         }
 817 }
 818 EXPORT_SYMBOL(inet6_unregister_protosw);
 819
 820 int inet6_sk_rebuild_header(struct sock *sk)
 821 {
 822         struct ipv6_pinfo *np = inet6_sk(sk);
 823         struct dst_entry *dst;
 824
 825         dst = __sk_dst_check(sk, np->dst_cookie);
 826
 827         if (!dst) {
 828                 struct inet_sock *inet = inet_sk(sk);
 829                 struct in6_addr *final_p, final;
 830                 struct flowi6 fl6;
 831
 832                 memset(&fl6, 0, sizeof(fl6));
 833                 fl6.flowi6_proto = sk->sk_protocol;
 834                 fl6.daddr = sk->sk_v6_daddr;
 835                 fl6.saddr = np->saddr;
 836                 fl6.flowlabel = np->flow_label;
 837                 fl6.flowi6_oif = sk->sk_bound_dev_if;
 838                 fl6.flowi6_mark = sk->sk_mark;
 839                 fl6.fl6_dport = inet->inet_dport;
 840                 fl6.fl6_sport = inet->inet_sport;
 841                 fl6.flowi6_uid = sk->sk_uid;
 842                 security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6));
 843
 844                 rcu_read_lock();
 845                 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt),
 846                                          &final);
 847                 rcu_read_unlock();
 848
 849                 dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
 850                 if (IS_ERR(dst)) {
 851                         sk->sk_route_caps = 0;
 852                         WRITE_ONCE(sk->sk_err_soft, -PTR_ERR(dst));
 853                         return PTR_ERR(dst);
 854                 }
 855
 856                 ip6_dst_store(sk, dst, NULL, NULL);
 857         }
 858
 859         return 0;
 860 }
 861 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
 862
 863 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
 864                        const struct inet6_skb_parm *opt)
 865 {
 866         const struct ipv6_pinfo *np = inet6_sk(sk);
 867
 868         if (np->rxopt.all) {
 869                 if (((opt->flags & IP6SKB_HOPBYHOP) &&
 870                      (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) ||
 871                     (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) &&
 872                      np->rxopt.bits.rxflow) ||
 873                     (opt->srcrt && (np->rxopt.bits.srcrt ||
 874                      np->rxopt.bits.osrcrt)) ||
 875                     ((opt->dst1 || opt->dst0) &&
 876                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
 877                         return true;
 878         }
 879         return false;
 880 }
 881 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
 882
 883 static struct packet_type ipv6_packet_type __read_mostly = {
 884         .type = cpu_to_be16(ETH_P_IPV6),
 885         .func = ipv6_rcv,
 886         .list_func = ipv6_list_rcv,
 887 };
 888
 889 static int __init ipv6_packet_init(void)
 890 {
 891         dev_add_pack(&ipv6_packet_type);
 892         return 0;
 893 }
 894
 895 static void ipv6_packet_cleanup(void)
 896 {
 897         dev_remove_pack(&ipv6_packet_type);
 898 }
 899
 900 static int __net_init ipv6_init_mibs(struct net *net)
 901 {
 902         int i;
 903
 904         net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib);
 905         if (!net->mib.udp_stats_in6)
 906                 return -ENOMEM;
 907         net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib);
 908         if (!net->mib.udplite_stats_in6)
 909                 goto err_udplite_mib;
 910         net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib);
 911         if (!net->mib.ipv6_statistics)
 912                 goto err_ip_mib;
 913
 914         for_each_possible_cpu(i) {
 915                 struct ipstats_mib *af_inet6_stats;
 916                 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i);
 917                 u64_stats_init(&af_inet6_stats->syncp);
 918         }
 919
 920
 921         net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib);
 922         if (!net->mib.icmpv6_statistics)
 923                 goto err_icmp_mib;
 924         net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
 925                                                 GFP_KERNEL);
 926         if (!net->mib.icmpv6msg_statistics)
 927                 goto err_icmpmsg_mib;
 928         return 0;
 929
 930 err_icmpmsg_mib:
 931         free_percpu(net->mib.icmpv6_statistics);
 932 err_icmp_mib:
 933         free_percpu(net->mib.ipv6_statistics);
 934 err_ip_mib:
 935         free_percpu(net->mib.udplite_stats_in6);
 936 err_udplite_mib:
 937         free_percpu(net->mib.udp_stats_in6);
 938         return -ENOMEM;
 939 }
 940
 941 static void ipv6_cleanup_mibs(struct net *net)
 942 {
 943         free_percpu(net->mib.udp_stats_in6);
 944         free_percpu(net->mib.udplite_stats_in6);
 945         free_percpu(net->mib.ipv6_statistics);
 946         free_percpu(net->mib.icmpv6_statistics);
 947         kfree(net->mib.icmpv6msg_statistics);
 948 }
 949
 950 static int __net_init inet6_net_init(struct net *net)
 951 {
 952         int err = 0;
 953
 954         net->ipv6.sysctl.bindv6only = 0;
 955         net->ipv6.sysctl.icmpv6_time = 1*HZ;
 956         net->ipv6.sysctl.icmpv6_echo_ignore_all = 0;
 957         net->ipv6.sysctl.icmpv6_echo_ignore_multicast = 0;
 958         net->ipv6.sysctl.icmpv6_echo_ignore_anycast = 0;
 959         net->ipv6.sysctl.icmpv6_error_anycast_as_unicast = 0;
 960
 961         /* By default, rate limit error messages.
 962          * Except for pmtu discovery, it would break it.
 963          * proc_do_large_bitmap needs pointer to the bitmap.
 964          */
 965         bitmap_set(net->ipv6.sysctl.icmpv6_ratemask, 0, ICMPV6_ERRMSG_MAX + 1);
 966         bitmap_clear(net->ipv6.sysctl.icmpv6_ratemask, ICMPV6_PKT_TOOBIG, 1);
 967         net->ipv6.sysctl.icmpv6_ratemask_ptr = net->ipv6.sysctl.icmpv6_ratemask;
 968
 969         net->ipv6.sysctl.flowlabel_consistency = 1;
 970         net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS;
 971         net->ipv6.sysctl.idgen_retries = 3;
 972         net->ipv6.sysctl.idgen_delay = 1 * HZ;
 973         net->ipv6.sysctl.flowlabel_state_ranges = 0;
 974         net->ipv6.sysctl.max_dst_opts_cnt = IP6_DEFAULT_MAX_DST_OPTS_CNT;
 975         net->ipv6.sysctl.max_hbh_opts_cnt = IP6_DEFAULT_MAX_HBH_OPTS_CNT;
 976         net->ipv6.sysctl.max_dst_opts_len = IP6_DEFAULT_MAX_DST_OPTS_LEN;
 977         net->ipv6.sysctl.max_hbh_opts_len = IP6_DEFAULT_MAX_HBH_OPTS_LEN;
 978         net->ipv6.sysctl.fib_notify_on_flag_change = 0;
 979         atomic_set(&net->ipv6.fib6_sernum, 1);
 980
 981         net->ipv6.sysctl.ioam6_id = IOAM6_DEFAULT_ID;
 982         net->ipv6.sysctl.ioam6_id_wide = IOAM6_DEFAULT_ID_WIDE;
 983
 984         err = ipv6_init_mibs(net);
 985         if (err)
 986                 return err;
 987 #ifdef CONFIG_PROC_FS
 988         err = udp6_proc_init(net);
 989         if (err)
 990                 goto out;
 991         err = tcp6_proc_init(net);
 992         if (err)
 993                 goto proc_tcp6_fail;
 994         err = ac6_proc_init(net);
 995         if (err)
 996                 goto proc_ac6_fail;
 997 #endif
 998         return err;
 999
1000 #ifdef CONFIG_PROC_FS
1001 proc_ac6_fail:
1002         tcp6_proc_exit(net);
1003 proc_tcp6_fail:
1004         udp6_proc_exit(net);
1005 out:
1006         ipv6_cleanup_mibs(net);
1007         return err;
1008 #endif
1009 }
1010
1011 static void __net_exit inet6_net_exit(struct net *net)
1012 {
1013 #ifdef CONFIG_PROC_FS
1014         udp6_proc_exit(net);
1015         tcp6_proc_exit(net);
1016         ac6_proc_exit(net);
1017 #endif
1018         ipv6_cleanup_mibs(net);
1019 }
1020
1021 static struct pernet_operations inet6_net_ops = {
1022         .init = inet6_net_init,
1023         .exit = inet6_net_exit,
1024 };
1025
1026 static int ipv6_route_input(struct sk_buff *skb)
1027 {
1028         ip6_route_input(skb);
1029         return skb_dst(skb)->error;
1030 }
1031
1032 static const struct ipv6_stub ipv6_stub_impl = {
1033         .ipv6_sock_mc_join = ipv6_sock_mc_join,
1034         .ipv6_sock_mc_drop = ipv6_sock_mc_drop,
1035         .ipv6_dst_lookup_flow = ip6_dst_lookup_flow,
1036         .ipv6_route_input  = ipv6_route_input,
1037         .fib6_get_table    = fib6_get_table,
1038         .fib6_table_lookup = fib6_table_lookup,
1039         .fib6_lookup       = fib6_lookup,
1040         .fib6_select_path  = fib6_select_path,
1041         .ip6_mtu_from_fib6 = ip6_mtu_from_fib6,
1042         .fib6_nh_init      = fib6_nh_init,
1043         .fib6_nh_release   = fib6_nh_release,
1044         .fib6_nh_release_dsts = fib6_nh_release_dsts,
1045         .fib6_update_sernum = fib6_update_sernum_stub,
1046         .fib6_rt_update    = fib6_rt_update,
1047         .ip6_del_rt        = ip6_del_rt,
1048         .udpv6_encap_enable = udpv6_encap_enable,
1049         .ndisc_send_na = ndisc_send_na,
1050 #if IS_ENABLED(CONFIG_XFRM)
1051         .xfrm6_local_rxpmtu = xfrm6_local_rxpmtu,
1052         .xfrm6_udp_encap_rcv = xfrm6_udp_encap_rcv,
1053         .xfrm6_gro_udp_encap_rcv = xfrm6_gro_udp_encap_rcv,
1054         .xfrm6_rcv_encap = xfrm6_rcv_encap,
1055 #endif
1056         .nd_tbl = &nd_tbl,
1057         .ipv6_fragment = ip6_fragment,
1058         .ipv6_dev_find = ipv6_dev_find,
1059 };
1060
1061 static const struct ipv6_bpf_stub ipv6_bpf_stub_impl = {
1062         .inet6_bind = __inet6_bind,
1063         .udp6_lib_lookup = __udp6_lib_lookup,
1064         .ipv6_setsockopt = do_ipv6_setsockopt,
1065         .ipv6_getsockopt = do_ipv6_getsockopt,
1066         .ipv6_dev_get_saddr = ipv6_dev_get_saddr,
1067 };
1068
1069 static int __init inet6_init(void)
1070 {
1071         struct list_head *r;
1072         int err = 0;
1073
1074         sock_skb_cb_check_size(sizeof(struct inet6_skb_parm));
1075
1076         /* Register the socket-side information for inet6_create.  */
1077         for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
1078                 INIT_LIST_HEAD(r);
1079
1080         raw_hashinfo_init(&raw_v6_hashinfo);
1081
1082         if (disable_ipv6_mod) {
1083                 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
1084                 goto out;
1085         }
1086
1087         err = proto_register(&tcpv6_prot, 1);
1088         if (err)
1089                 goto out;
1090
1091         err = proto_register(&udpv6_prot, 1);
1092         if (err)
1093                 goto out_unregister_tcp_proto;
1094
1095         err = proto_register(&udplitev6_prot, 1);
1096         if (err)
1097                 goto out_unregister_udp_proto;
1098
1099         err = proto_register(&rawv6_prot, 1);
1100         if (err)
1101                 goto out_unregister_udplite_proto;
1102
1103         err = proto_register(&pingv6_prot, 1);
1104         if (err)
1105                 goto out_unregister_raw_proto;
1106
1107         /* We MUST register RAW sockets before we create the ICMP6,
1108          * IGMP6, or NDISC control sockets.
1109          */
1110         err = rawv6_init();
1111         if (err)
1112                 goto out_unregister_ping_proto;
1113
1114         /* Register the family here so that the init calls below will
1115          * be able to create sockets. (?? is this dangerous ??)
1116          */
1117         err = sock_register(&inet6_family_ops);
1118         if (err)
1119                 goto out_sock_register_fail;
1120
1121         /*
1122          *      ipngwg API draft makes clear that the correct semantics
1123          *      for TCP and UDP is to consider one TCP and UDP instance
1124          *      in a host available by both INET and INET6 APIs and
1125          *      able to communicate via both network protocols.
1126          */
1127
1128         err = register_pernet_subsys(&inet6_net_ops);
1129         if (err)
1130                 goto register_pernet_fail;
1131         err = ip6_mr_init();
1132         if (err)
1133                 goto ipmr_fail;
1134         err = icmpv6_init();
1135         if (err)
1136                 goto icmp_fail;
1137         err = ndisc_init();
1138         if (err)
1139                 goto ndisc_fail;
1140         err = igmp6_init();
1141         if (err)
1142                 goto igmp_fail;
1143
1144         err = ipv6_netfilter_init();
1145         if (err)
1146                 goto netfilter_fail;
1147         /* Create /proc/foo6 entries. */
1148 #ifdef CONFIG_PROC_FS
1149         err = -ENOMEM;
1150         if (raw6_proc_init())
1151                 goto proc_raw6_fail;
1152         if (udplite6_proc_init())
1153                 goto proc_udplite6_fail;
1154         if (ipv6_misc_proc_init())
1155                 goto proc_misc6_fail;
1156         if (if6_proc_init())
1157                 goto proc_if6_fail;
1158 #endif
1159         err = ip6_route_init();
1160         if (err)
1161                 goto ip6_route_fail;
1162         err = ndisc_late_init();
1163         if (err)
1164                 goto ndisc_late_fail;
1165         err = ip6_flowlabel_init();
1166         if (err)
1167                 goto ip6_flowlabel_fail;
1168         err = ipv6_anycast_init();
1169         if (err)
1170                 goto ipv6_anycast_fail;
1171         err = addrconf_init();
1172         if (err)
1173                 goto addrconf_fail;
1174
1175         /* Init v6 extension headers. */
1176         err = ipv6_exthdrs_init();
1177         if (err)
1178                 goto ipv6_exthdrs_fail;
1179
1180         err = ipv6_frag_init();
1181         if (err)
1182                 goto ipv6_frag_fail;
1183
1184         /* Init v6 transport protocols. */
1185         err = udpv6_init();
1186         if (err)
1187                 goto udpv6_fail;
1188
1189         err = udplitev6_init();
1190         if (err)
1191                 goto udplitev6_fail;
1192
1193         err = udpv6_offload_init();
1194         if (err)
1195                 goto udpv6_offload_fail;
1196
1197         err = tcpv6_init();
1198         if (err)
1199                 goto tcpv6_fail;
1200
1201         err = ipv6_packet_init();
1202         if (err)
1203                 goto ipv6_packet_fail;
1204
1205         err = pingv6_init();
1206         if (err)
1207                 goto pingv6_fail;
1208
1209         err = calipso_init();
1210         if (err)
1211                 goto calipso_fail;
1212
1213         err = seg6_init();
1214         if (err)
1215                 goto seg6_fail;
1216
1217         err = rpl_init();
1218         if (err)
1219                 goto rpl_fail;
1220
1221         err = ioam6_init();
1222         if (err)
1223                 goto ioam6_fail;
1224
1225         err = igmp6_late_init();
1226         if (err)
1227                 goto igmp6_late_err;
1228
1229 #ifdef CONFIG_SYSCTL
1230         err = ipv6_sysctl_register();
1231         if (err)
1232                 goto sysctl_fail;
1233 #endif
1234
1235         /* ensure that ipv6 stubs are visible only after ipv6 is ready */
1236         wmb();
1237         ipv6_stub = &ipv6_stub_impl;
1238         ipv6_bpf_stub = &ipv6_bpf_stub_impl;
1239 out:
1240         return err;
1241
1242 #ifdef CONFIG_SYSCTL
1243 sysctl_fail:
1244         igmp6_late_cleanup();
1245 #endif
1246 igmp6_late_err:
1247         ioam6_exit();
1248 ioam6_fail:
1249         rpl_exit();
1250 rpl_fail:
1251         seg6_exit();
1252 seg6_fail:
1253         calipso_exit();
1254 calipso_fail:
1255         pingv6_exit();
1256 pingv6_fail:
1257         ipv6_packet_cleanup();
1258 ipv6_packet_fail:
1259         tcpv6_exit();
1260 tcpv6_fail:
1261         udpv6_offload_exit();
1262 udpv6_offload_fail:
1263         udplitev6_exit();
1264 udplitev6_fail:
1265         udpv6_exit();
1266 udpv6_fail:
1267         ipv6_frag_exit();
1268 ipv6_frag_fail:
1269         ipv6_exthdrs_exit();
1270 ipv6_exthdrs_fail:
1271         addrconf_cleanup();
1272 addrconf_fail:
1273         ipv6_anycast_cleanup();
1274 ipv6_anycast_fail:
1275         ip6_flowlabel_cleanup();
1276 ip6_flowlabel_fail:
1277         ndisc_late_cleanup();
1278 ndisc_late_fail:
1279         ip6_route_cleanup();
1280 ip6_route_fail:
1281 #ifdef CONFIG_PROC_FS
1282         if6_proc_exit();
1283 proc_if6_fail:
1284         ipv6_misc_proc_exit();
1285 proc_misc6_fail:
1286         udplite6_proc_exit();
1287 proc_udplite6_fail:
1288         raw6_proc_exit();
1289 proc_raw6_fail:
1290 #endif
1291         ipv6_netfilter_fini();
1292 netfilter_fail:
1293         igmp6_cleanup();
1294 igmp_fail:
1295         ndisc_cleanup();
1296 ndisc_fail:
1297         icmpv6_cleanup();
1298 icmp_fail:
1299         ip6_mr_cleanup();
1300 ipmr_fail:
1301         unregister_pernet_subsys(&inet6_net_ops);
1302 register_pernet_fail:
1303         sock_unregister(PF_INET6);
1304         rtnl_unregister_all(PF_INET6);
1305 out_sock_register_fail:
1306         rawv6_exit();
1307 out_unregister_ping_proto:
1308         proto_unregister(&pingv6_prot);
1309 out_unregister_raw_proto:
1310         proto_unregister(&rawv6_prot);
1311 out_unregister_udplite_proto:
1312         proto_unregister(&udplitev6_prot);
1313 out_unregister_udp_proto:
1314         proto_unregister(&udpv6_prot);
1315 out_unregister_tcp_proto:
1316         proto_unregister(&tcpv6_prot);
1317         goto out;
1318 }
1319 module_init(inet6_init);
1320
1321 MODULE_ALIAS_NETPROTO(PF_INET6);