net/ipv6/af_inet6.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *      PF_INET6 socket protocol family
   4  *      Linux INET6 implementation
   5  *
   6  *      Authors:
   7  *      Pedro Roque             <roque@di.fc.ul.pt>
   8  *
   9  *      Adapted from linux/net/ipv4/af_inet.c
  10  *
  11  *      Fixes:
  12  *      piggy, Karl Knutson     :       Socket protocol table
  13  *      Hideaki YOSHIFUJI       :       sin6_scope_id support
  14  *      Arnaldo Melo            :       check proc_net_create return, cleanups
  15  */
  16
  17 #define pr_fmt(fmt) "IPv6: " fmt
  18
  19 #include <linux/module.h>
  20 #include <linux/capability.h>
  21 #include <linux/errno.h>
  22 #include <linux/types.h>
  23 #include <linux/socket.h>
  24 #include <linux/in.h>
  25 #include <linux/kernel.h>
  26 #include <linux/timer.h>
  27 #include <linux/string.h>
  28 #include <linux/sockios.h>
  29 #include <linux/net.h>
  30 #include <linux/fcntl.h>
  31 #include <linux/mm.h>
  32 #include <linux/interrupt.h>
  33 #include <linux/proc_fs.h>
  34 #include <linux/stat.h>
  35 #include <linux/init.h>
  36 #include <linux/slab.h>
  37
  38 #include <linux/inet.h>
  39 #include <linux/netdevice.h>
  40 #include <linux/icmpv6.h>
  41 #include <linux/netfilter_ipv6.h>
  42
  43 #include <net/ip.h>
  44 #include <net/ipv6.h>
  45 #include <net/udp.h>
  46 #include <net/udplite.h>
  47 #include <net/tcp.h>
  48 #include <net/ping.h>
  49 #include <net/protocol.h>
  50 #include <net/inet_common.h>
  51 #include <net/route.h>
  52 #include <net/transp_v6.h>
  53 #include <net/ip6_route.h>
  54 #include <net/addrconf.h>
  55 #include <net/ipv6_stubs.h>
  56 #include <net/ndisc.h>
  57 #ifdef CONFIG_IPV6_TUNNEL
  58 #include <net/ip6_tunnel.h>
  59 #endif
  60 #include <net/calipso.h>
  61 #include <net/seg6.h>
  62 #include <net/rpl.h>
  63 #include <net/compat.h>
  64 #include <net/xfrm.h>
  65 #include <net/ioam6.h>
  66 #include <net/rawv6.h>
  67
  68 #include <linux/uaccess.h>
  69 #include <linux/mroute6.h>
  70
  71 #include "ip6_offload.h"
  72
  73 MODULE_AUTHOR("Cast of dozens");
  74 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
  75 MODULE_LICENSE("GPL");
  76
  77 /* The inetsw6 table contains everything that inet6_create needs to
  78  * build a new socket.
  79  */
  80 static struct list_head inetsw6[SOCK_MAX];
  81 static DEFINE_SPINLOCK(inetsw6_lock);
  82
  83 struct ipv6_params ipv6_defaults = {
  84         .disable_ipv6 = 0,
  85         .autoconf = 1,
  86 };
  87
  88 static int disable_ipv6_mod;
  89
  90 module_param_named(disable, disable_ipv6_mod, int, 0444);
  91 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
  92
  93 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
  94 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
  95
  96 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
  97 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
  98
  99 bool ipv6_mod_enabled(void)
 100 {
 101         return disable_ipv6_mod == 0;
 102 }
 103 EXPORT_SYMBOL_GPL(ipv6_mod_enabled);
 104
 105 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
 106 {
 107         const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
 108
 109         return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
 110 }
 111
 112 void inet6_sock_destruct(struct sock *sk)
 113 {
 114         inet6_cleanup_sock(sk);
 115         inet_sock_destruct(sk);
 116 }
 117 EXPORT_SYMBOL_GPL(inet6_sock_destruct);
 118
 119 static int inet6_create(struct net *net, struct socket *sock, int protocol,
 120                         int kern)
 121 {
 122         struct inet_sock *inet;
 123         struct ipv6_pinfo *np;
 124         struct sock *sk;
 125         struct inet_protosw *answer;
 126         struct proto *answer_prot;
 127         unsigned char answer_flags;
 128         int try_loading_module = 0;
 129         int err;
 130
 131         if (protocol < 0 || protocol >= IPPROTO_MAX)
 132                 return -EINVAL;
 133
 134         /* Look for the requested type/protocol pair. */
 135 lookup_protocol:
 136         err = -ESOCKTNOSUPPORT;
 137         rcu_read_lock();
 138         list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
 139
 140                 err = 0;
 141                 /* Check the non-wild match. */
 142                 if (protocol == answer->protocol) {
 143                         if (protocol != IPPROTO_IP)
 144                                 break;
 145                 } else {
 146                         /* Check for the two wild cases. */
 147                         if (IPPROTO_IP == protocol) {
 148                                 protocol = answer->protocol;
 149                                 break;
 150                         }
 151                         if (IPPROTO_IP == answer->protocol)
 152                                 break;
 153                 }
 154                 err = -EPROTONOSUPPORT;
 155         }
 156
 157         if (err) {
 158                 if (try_loading_module < 2) {
 159                         rcu_read_unlock();
 160                         /*
 161                          * Be more specific, e.g. net-pf-10-proto-132-type-1
 162                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
 163                          */
 164                         if (++try_loading_module == 1)
 165                                 request_module("net-pf-%d-proto-%d-type-%d",
 166                                                 PF_INET6, protocol, sock->type);
 167                         /*
 168                          * Fall back to generic, e.g. net-pf-10-proto-132
 169                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
 170                          */
 171                         else
 172                                 request_module("net-pf-%d-proto-%d",
 173                                                 PF_INET6, protocol);
 174                         goto lookup_protocol;
 175                 } else
 176                         goto out_rcu_unlock;
 177         }
 178
 179         err = -EPERM;
 180         if (sock->type == SOCK_RAW && !kern &&
 181             !ns_capable(net->user_ns, CAP_NET_RAW))
 182                 goto out_rcu_unlock;
 183
 184         sock->ops = answer->ops;
 185         answer_prot = answer->prot;
 186         answer_flags = answer->flags;
 187         rcu_read_unlock();
 188
 189         WARN_ON(!answer_prot->slab);
 190
 191         err = -ENOBUFS;
 192         sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern);
 193         if (!sk)
 194                 goto out;
 195
 196         sock_init_data(sock, sk);
 197
 198         err = 0;
 199         if (INET_PROTOSW_REUSE & answer_flags)
 200                 sk->sk_reuse = SK_CAN_REUSE;
 201
 202         inet = inet_sk(sk);
 203         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
 204
 205         if (SOCK_RAW == sock->type) {
 206                 inet->inet_num = protocol;
 207                 if (IPPROTO_RAW == protocol)
 208                         inet->hdrincl = 1;
 209         }
 210
 211         sk->sk_destruct         = inet6_sock_destruct;
 212         sk->sk_family           = PF_INET6;
 213         sk->sk_protocol         = protocol;
 214
 215         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
 216
 217         inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
 218         np->hop_limit   = -1;
 219         np->mcast_hops  = IPV6_DEFAULT_MCASTHOPS;
 220         np->mc_loop     = 1;
 221         np->mc_all      = 1;
 222         np->pmtudisc    = IPV6_PMTUDISC_WANT;
 223         np->repflow     = net->ipv6.sysctl.flowlabel_reflect & FLOWLABEL_REFLECT_ESTABLISHED;
 224         sk->sk_ipv6only = net->ipv6.sysctl.bindv6only;
 225         sk->sk_txrehash = READ_ONCE(net->core.sysctl_txrehash);
 226
 227         /* Init the ipv4 part of the socket since we can have sockets
 228          * using v6 API for ipv4.
 229          */
 230         inet->uc_ttl    = -1;
 231
 232         inet->mc_loop   = 1;
 233         inet->mc_ttl    = 1;
 234         inet->mc_index  = 0;
 235         RCU_INIT_POINTER(inet->mc_list, NULL);
 236         inet->rcv_tos   = 0;
 237
 238         if (READ_ONCE(net->ipv4.sysctl_ip_no_pmtu_disc))
 239                 inet->pmtudisc = IP_PMTUDISC_DONT;
 240         else
 241                 inet->pmtudisc = IP_PMTUDISC_WANT;
 242         /*
 243          * Increment only the relevant sk_prot->socks debug field, this changes
 244          * the previous behaviour of incrementing both the equivalent to
 245          * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
 246          *
 247          * This allows better debug granularity as we'll know exactly how many
 248          * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
 249          * transport protocol socks. -acme
 250          */
 251         sk_refcnt_debug_inc(sk);
 252
 253         if (inet->inet_num) {
 254                 /* It assumes that any protocol which allows
 255                  * the user to assign a number at socket
 256                  * creation time automatically shares.
 257                  */
 258                 inet->inet_sport = htons(inet->inet_num);
 259                 err = sk->sk_prot->hash(sk);
 260                 if (err) {
 261                         sk_common_release(sk);
 262                         goto out;
 263                 }
 264         }
 265         if (sk->sk_prot->init) {
 266                 err = sk->sk_prot->init(sk);
 267                 if (err) {
 268                         sk_common_release(sk);
 269                         goto out;
 270                 }
 271         }
 272
 273         if (!kern) {
 274                 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
 275                 if (err) {
 276                         sk_common_release(sk);
 277                         goto out;
 278                 }
 279         }
 280 out:
 281         return err;
 282 out_rcu_unlock:
 283         rcu_read_unlock();
 284         goto out;
 285 }
 286
 287 static int __inet6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
 288                         u32 flags)
 289 {
 290         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
 291         struct inet_sock *inet = inet_sk(sk);
 292         struct ipv6_pinfo *np = inet6_sk(sk);
 293         struct net *net = sock_net(sk);
 294         __be32 v4addr = 0;
 295         unsigned short snum;
 296         bool saved_ipv6only;
 297         int addr_type = 0;
 298         int err = 0;
 299
 300         if (addr->sin6_family != AF_INET6)
 301                 return -EAFNOSUPPORT;
 302
 303         addr_type = ipv6_addr_type(&addr->sin6_addr);
 304         if ((addr_type & IPV6_ADDR_MULTICAST) && sk->sk_type == SOCK_STREAM)
 305                 return -EINVAL;
 306
 307         snum = ntohs(addr->sin6_port);
 308         if (!(flags & BIND_NO_CAP_NET_BIND_SERVICE) &&
 309             snum && inet_port_requires_bind_service(net, snum) &&
 310             !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
 311                 return -EACCES;
 312
 313         if (flags & BIND_WITH_LOCK)
 314                 lock_sock(sk);
 315
 316         /* Check these errors (active socket, double bind). */
 317         if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
 318                 err = -EINVAL;
 319                 goto out;
 320         }
 321
 322         /* Check if the address belongs to the host. */
 323         if (addr_type == IPV6_ADDR_MAPPED) {
 324                 struct net_device *dev = NULL;
 325                 int chk_addr_ret;
 326
 327                 /* Binding to v4-mapped address on a v6-only socket
 328                  * makes no sense
 329                  */
 330                 if (ipv6_only_sock(sk)) {
 331                         err = -EINVAL;
 332                         goto out;
 333                 }
 334
 335                 rcu_read_lock();
 336                 if (sk->sk_bound_dev_if) {
 337                         dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
 338                         if (!dev) {
 339                                 err = -ENODEV;
 340                                 goto out_unlock;
 341                         }
 342                 }
 343
 344                 /* Reproduce AF_INET checks to make the bindings consistent */
 345                 v4addr = addr->sin6_addr.s6_addr32[3];
 346                 chk_addr_ret = inet_addr_type_dev_table(net, dev, v4addr);
 347                 rcu_read_unlock();
 348
 349                 if (!inet_addr_valid_or_nonlocal(net, inet, v4addr,
 350                                                  chk_addr_ret)) {
 351                         err = -EADDRNOTAVAIL;
 352                         goto out;
 353                 }
 354         } else {
 355                 if (addr_type != IPV6_ADDR_ANY) {
 356                         struct net_device *dev = NULL;
 357
 358                         rcu_read_lock();
 359                         if (__ipv6_addr_needs_scope_id(addr_type)) {
 360                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 361                                     addr->sin6_scope_id) {
 362                                         /* Override any existing binding, if another one
 363                                          * is supplied by user.
 364                                          */
 365                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
 366                                 }
 367
 368                                 /* Binding to link-local address requires an interface */
 369                                 if (!sk->sk_bound_dev_if) {
 370                                         err = -EINVAL;
 371                                         goto out_unlock;
 372                                 }
 373                         }
 374
 375                         if (sk->sk_bound_dev_if) {
 376                                 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
 377                                 if (!dev) {
 378                                         err = -ENODEV;
 379                                         goto out_unlock;
 380                                 }
 381                         }
 382
 383                         /* ipv4 addr of the socket is invalid.  Only the
 384                          * unspecified and mapped address have a v4 equivalent.
 385                          */
 386                         v4addr = LOOPBACK4_IPV6;
 387                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
 388                                 if (!ipv6_can_nonlocal_bind(net, inet) &&
 389                                     !ipv6_chk_addr(net, &addr->sin6_addr,
 390                                                    dev, 0)) {
 391                                         err = -EADDRNOTAVAIL;
 392                                         goto out_unlock;
 393                                 }
 394                         }
 395                         rcu_read_unlock();
 396                 }
 397         }
 398
 399         inet->inet_rcv_saddr = v4addr;
 400         inet->inet_saddr = v4addr;
 401
 402         sk->sk_v6_rcv_saddr = addr->sin6_addr;
 403
 404         if (!(addr_type & IPV6_ADDR_MULTICAST))
 405                 np->saddr = addr->sin6_addr;
 406
 407         saved_ipv6only = sk->sk_ipv6only;
 408         if (addr_type != IPV6_ADDR_ANY && addr_type != IPV6_ADDR_MAPPED)
 409                 sk->sk_ipv6only = 1;
 410
 411         /* Make sure we are allowed to bind here. */
 412         if (snum || !(inet->bind_address_no_port ||
 413                       (flags & BIND_FORCE_ADDRESS_NO_PORT))) {
 414                 err = sk->sk_prot->get_port(sk, snum);
 415                 if (err) {
 416                         sk->sk_ipv6only = saved_ipv6only;
 417                         inet_reset_saddr(sk);
 418                         goto out;
 419                 }
 420                 if (!(flags & BIND_FROM_BPF)) {
 421                         err = BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk);
 422                         if (err) {
 423                                 sk->sk_ipv6only = saved_ipv6only;
 424                                 inet_reset_saddr(sk);
 425                                 if (sk->sk_prot->put_port)
 426                                         sk->sk_prot->put_port(sk);
 427                                 goto out;
 428                         }
 429                 }
 430         }
 431
 432         if (addr_type != IPV6_ADDR_ANY)
 433                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
 434         if (snum)
 435                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
 436         inet->inet_sport = htons(inet->inet_num);
 437         inet->inet_dport = 0;
 438         inet->inet_daddr = 0;
 439 out:
 440         if (flags & BIND_WITH_LOCK)
 441                 release_sock(sk);
 442         return err;
 443 out_unlock:
 444         rcu_read_unlock();
 445         goto out;
 446 }
 447
 448 /* bind for INET6 API */
 449 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 450 {
 451         struct sock *sk = sock->sk;
 452         u32 flags = BIND_WITH_LOCK;
 453         const struct proto *prot;
 454         int err = 0;
 455
 456         /* IPV6_ADDRFORM can change sk->sk_prot under us. */
 457         prot = READ_ONCE(sk->sk_prot);
 458         /* If the socket has its own bind function then use it. */
 459         if (prot->bind)
 460                 return prot->bind(sk, uaddr, addr_len);
 461
 462         if (addr_len < SIN6_LEN_RFC2133)
 463                 return -EINVAL;
 464
 465         /* BPF prog is run before any checks are done so that if the prog
 466          * changes context in a wrong way it will be caught.
 467          */
 468         err = BPF_CGROUP_RUN_PROG_INET_BIND_LOCK(sk, uaddr,
 469                                                  CGROUP_INET6_BIND, &flags);
 470         if (err)
 471                 return err;
 472
 473         return __inet6_bind(sk, uaddr, addr_len, flags);
 474 }
 475 EXPORT_SYMBOL(inet6_bind);
 476
 477 int inet6_release(struct socket *sock)
 478 {
 479         struct sock *sk = sock->sk;
 480
 481         if (!sk)
 482                 return -EINVAL;
 483
 484         /* Free mc lists */
 485         ipv6_sock_mc_close(sk);
 486
 487         /* Free ac lists */
 488         ipv6_sock_ac_close(sk);
 489
 490         return inet_release(sock);
 491 }
 492 EXPORT_SYMBOL(inet6_release);
 493
 494 void inet6_destroy_sock(struct sock *sk)
 495 {
 496         struct ipv6_pinfo *np = inet6_sk(sk);
 497         struct sk_buff *skb;
 498         struct ipv6_txoptions *opt;
 499
 500         /* Release rx options */
 501
 502         skb = xchg(&np->pktoptions, NULL);
 503         kfree_skb(skb);
 504
 505         skb = xchg(&np->rxpmtu, NULL);
 506         kfree_skb(skb);
 507
 508         /* Free flowlabels */
 509         fl6_free_socklist(sk);
 510
 511         /* Free tx options */
 512
 513         opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL);
 514         if (opt) {
 515                 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 516                 txopt_put(opt);
 517         }
 518 }
 519 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
 520
 521 void inet6_cleanup_sock(struct sock *sk)
 522 {
 523         inet6_destroy_sock(sk);
 524 }
 525 EXPORT_SYMBOL_GPL(inet6_cleanup_sock);
 526
 527 /*
 528  *      This does both peername and sockname.
 529  */
 530 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 531                   int peer)
 532 {
 533         struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
 534         struct sock *sk = sock->sk;
 535         struct inet_sock *inet = inet_sk(sk);
 536         struct ipv6_pinfo *np = inet6_sk(sk);
 537
 538         sin->sin6_family = AF_INET6;
 539         sin->sin6_flowinfo = 0;
 540         sin->sin6_scope_id = 0;
 541         lock_sock(sk);
 542         if (peer) {
 543                 if (!inet->inet_dport ||
 544                     (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
 545                     peer == 1)) {
 546                         release_sock(sk);
 547                         return -ENOTCONN;
 548                 }
 549                 sin->sin6_port = inet->inet_dport;
 550                 sin->sin6_addr = sk->sk_v6_daddr;
 551                 if (np->sndflow)
 552                         sin->sin6_flowinfo = np->flow_label;
 553                 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin,
 554                                        CGROUP_INET6_GETPEERNAME);
 555         } else {
 556                 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
 557                         sin->sin6_addr = np->saddr;
 558                 else
 559                         sin->sin6_addr = sk->sk_v6_rcv_saddr;
 560                 sin->sin6_port = inet->inet_sport;
 561                 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin,
 562                                        CGROUP_INET6_GETSOCKNAME);
 563         }
 564         sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
 565                                                  sk->sk_bound_dev_if);
 566         release_sock(sk);
 567         return sizeof(*sin);
 568 }
 569 EXPORT_SYMBOL(inet6_getname);
 570
 571 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 572 {
 573         void __user *argp = (void __user *)arg;
 574         struct sock *sk = sock->sk;
 575         struct net *net = sock_net(sk);
 576         const struct proto *prot;
 577
 578         switch (cmd) {
 579         case SIOCADDRT:
 580         case SIOCDELRT: {
 581                 struct in6_rtmsg rtmsg;
 582
 583                 if (copy_from_user(&rtmsg, argp, sizeof(rtmsg)))
 584                         return -EFAULT;
 585                 return ipv6_route_ioctl(net, cmd, &rtmsg);
 586         }
 587         case SIOCSIFADDR:
 588                 return addrconf_add_ifaddr(net, argp);
 589         case SIOCDIFADDR:
 590                 return addrconf_del_ifaddr(net, argp);
 591         case SIOCSIFDSTADDR:
 592                 return addrconf_set_dstaddr(net, argp);
 593         default:
 594                 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
 595                 prot = READ_ONCE(sk->sk_prot);
 596                 if (!prot->ioctl)
 597                         return -ENOIOCTLCMD;
 598                 return prot->ioctl(sk, cmd, arg);
 599         }
 600         /*NOTREACHED*/
 601         return 0;
 602 }
 603 EXPORT_SYMBOL(inet6_ioctl);
 604
 605 #ifdef CONFIG_COMPAT
 606 struct compat_in6_rtmsg {
 607         struct in6_addr         rtmsg_dst;
 608         struct in6_addr         rtmsg_src;
 609         struct in6_addr         rtmsg_gateway;
 610         u32                     rtmsg_type;
 611         u16                     rtmsg_dst_len;
 612         u16                     rtmsg_src_len;
 613         u32                     rtmsg_metric;
 614         u32                     rtmsg_info;
 615         u32                     rtmsg_flags;
 616         s32                     rtmsg_ifindex;
 617 };
 618
 619 static int inet6_compat_routing_ioctl(struct sock *sk, unsigned int cmd,
 620                 struct compat_in6_rtmsg __user *ur)
 621 {
 622         struct in6_rtmsg rt;
 623
 624         if (copy_from_user(&rt.rtmsg_dst, &ur->rtmsg_dst,
 625                         3 * sizeof(struct in6_addr)) ||
 626             get_user(rt.rtmsg_type, &ur->rtmsg_type) ||
 627             get_user(rt.rtmsg_dst_len, &ur->rtmsg_dst_len) ||
 628             get_user(rt.rtmsg_src_len, &ur->rtmsg_src_len) ||
 629             get_user(rt.rtmsg_metric, &ur->rtmsg_metric) ||
 630             get_user(rt.rtmsg_info, &ur->rtmsg_info) ||
 631             get_user(rt.rtmsg_flags, &ur->rtmsg_flags) ||
 632             get_user(rt.rtmsg_ifindex, &ur->rtmsg_ifindex))
 633                 return -EFAULT;
 634
 635
 636         return ipv6_route_ioctl(sock_net(sk), cmd, &rt);
 637 }
 638
 639 int inet6_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 640 {
 641         void __user *argp = compat_ptr(arg);
 642         struct sock *sk = sock->sk;
 643
 644         switch (cmd) {
 645         case SIOCADDRT:
 646         case SIOCDELRT:
 647                 return inet6_compat_routing_ioctl(sk, cmd, argp);
 648         default:
 649                 return -ENOIOCTLCMD;
 650         }
 651 }
 652 EXPORT_SYMBOL_GPL(inet6_compat_ioctl);
 653 #endif /* CONFIG_COMPAT */
 654
 655 INDIRECT_CALLABLE_DECLARE(int udpv6_sendmsg(struct sock *, struct msghdr *,
 656                                             size_t));
 657 int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
 658 {
 659         struct sock *sk = sock->sk;
 660         const struct proto *prot;
 661
 662         if (unlikely(inet_send_prepare(sk)))
 663                 return -EAGAIN;
 664
 665         /* IPV6_ADDRFORM can change sk->sk_prot under us. */
 666         prot = READ_ONCE(sk->sk_prot);
 667         return INDIRECT_CALL_2(prot->sendmsg, tcp_sendmsg, udpv6_sendmsg,
 668                                sk, msg, size);
 669 }
 670
 671 INDIRECT_CALLABLE_DECLARE(int udpv6_recvmsg(struct sock *, struct msghdr *,
 672                                             size_t, int, int *));
 673 int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
 674                   int flags)
 675 {
 676         struct sock *sk = sock->sk;
 677         const struct proto *prot;
 678         int addr_len = 0;
 679         int err;
 680
 681         if (likely(!(flags & MSG_ERRQUEUE)))
 682                 sock_rps_record_flow(sk);
 683
 684         /* IPV6_ADDRFORM can change sk->sk_prot under us. */
 685         prot = READ_ONCE(sk->sk_prot);
 686         err = INDIRECT_CALL_2(prot->recvmsg, tcp_recvmsg, udpv6_recvmsg,
 687                               sk, msg, size, flags, &addr_len);
 688         if (err >= 0)
 689                 msg->msg_namelen = addr_len;
 690         return err;
 691 }
 692
 693 const struct proto_ops inet6_stream_ops = {
 694         .family            = PF_INET6,
 695         .owner             = THIS_MODULE,
 696         .release           = inet6_release,
 697         .bind              = inet6_bind,
 698         .connect           = inet_stream_connect,       /* ok           */
 699         .socketpair        = sock_no_socketpair,        /* a do nothing */
 700         .accept            = inet_accept,               /* ok           */
 701         .getname           = inet6_getname,
 702         .poll              = tcp_poll,                  /* ok           */
 703         .ioctl             = inet6_ioctl,               /* must change  */
 704         .gettstamp         = sock_gettstamp,
 705         .listen            = inet_listen,               /* ok           */
 706         .shutdown          = inet_shutdown,             /* ok           */
 707         .setsockopt        = sock_common_setsockopt,    /* ok           */
 708         .getsockopt        = sock_common_getsockopt,    /* ok           */
 709         .sendmsg           = inet6_sendmsg,             /* retpoline's sake */
 710         .recvmsg           = inet6_recvmsg,             /* retpoline's sake */
 711 #ifdef CONFIG_MMU
 712         .mmap              = tcp_mmap,
 713 #endif
 714         .sendpage          = inet_sendpage,
 715         .sendmsg_locked    = tcp_sendmsg_locked,
 716         .sendpage_locked   = tcp_sendpage_locked,
 717         .splice_read       = tcp_splice_read,
 718         .read_sock         = tcp_read_sock,
 719         .read_skb          = tcp_read_skb,
 720         .peek_len          = tcp_peek_len,
 721 #ifdef CONFIG_COMPAT
 722         .compat_ioctl      = inet6_compat_ioctl,
 723 #endif
 724         .set_rcvlowat      = tcp_set_rcvlowat,
 725 };
 726
 727 const struct proto_ops inet6_dgram_ops = {
 728         .family            = PF_INET6,
 729         .owner             = THIS_MODULE,
 730         .release           = inet6_release,
 731         .bind              = inet6_bind,
 732         .connect           = inet_dgram_connect,        /* ok           */
 733         .socketpair        = sock_no_socketpair,        /* a do nothing */
 734         .accept            = sock_no_accept,            /* a do nothing */
 735         .getname           = inet6_getname,
 736         .poll              = udp_poll,                  /* ok           */
 737         .ioctl             = inet6_ioctl,               /* must change  */
 738         .gettstamp         = sock_gettstamp,
 739         .listen            = sock_no_listen,            /* ok           */
 740         .shutdown          = inet_shutdown,             /* ok           */
 741         .setsockopt        = sock_common_setsockopt,    /* ok           */
 742         .getsockopt        = sock_common_getsockopt,    /* ok           */
 743         .sendmsg           = inet6_sendmsg,             /* retpoline's sake */
 744         .recvmsg           = inet6_recvmsg,             /* retpoline's sake */
 745         .read_skb          = udp_read_skb,
 746         .mmap              = sock_no_mmap,
 747         .sendpage          = sock_no_sendpage,
 748         .set_peek_off      = sk_set_peek_off,
 749 #ifdef CONFIG_COMPAT
 750         .compat_ioctl      = inet6_compat_ioctl,
 751 #endif
 752 };
 753
 754 static const struct net_proto_family inet6_family_ops = {
 755         .family = PF_INET6,
 756         .create = inet6_create,
 757         .owner  = THIS_MODULE,
 758 };
 759
 760 int inet6_register_protosw(struct inet_protosw *p)
 761 {
 762         struct list_head *lh;
 763         struct inet_protosw *answer;
 764         struct list_head *last_perm;
 765         int protocol = p->protocol;
 766         int ret;
 767
 768         spin_lock_bh(&inetsw6_lock);
 769
 770         ret = -EINVAL;
 771         if (p->type >= SOCK_MAX)
 772                 goto out_illegal;
 773
 774         /* If we are trying to override a permanent protocol, bail. */
 775         answer = NULL;
 776         ret = -EPERM;
 777         last_perm = &inetsw6[p->type];
 778         list_for_each(lh, &inetsw6[p->type]) {
 779                 answer = list_entry(lh, struct inet_protosw, list);
 780
 781                 /* Check only the non-wild match. */
 782                 if (INET_PROTOSW_PERMANENT & answer->flags) {
 783                         if (protocol == answer->protocol)
 784                                 break;
 785                         last_perm = lh;
 786                 }
 787
 788                 answer = NULL;
 789         }
 790         if (answer)
 791                 goto out_permanent;
 792
 793         /* Add the new entry after the last permanent entry if any, so that
 794          * the new entry does not override a permanent entry when matched with
 795          * a wild-card protocol. But it is allowed to override any existing
 796          * non-permanent entry.  This means that when we remove this entry, the
 797          * system automatically returns to the old behavior.
 798          */
 799         list_add_rcu(&p->list, last_perm);
 800         ret = 0;
 801 out:
 802         spin_unlock_bh(&inetsw6_lock);
 803         return ret;
 804
 805 out_permanent:
 806         pr_err("Attempt to override permanent protocol %d\n", protocol);
 807         goto out;
 808
 809 out_illegal:
 810         pr_err("Ignoring attempt to register invalid socket type %d\n",
 811                p->type);
 812         goto out;
 813 }
 814 EXPORT_SYMBOL(inet6_register_protosw);
 815
 816 void
 817 inet6_unregister_protosw(struct inet_protosw *p)
 818 {
 819         if (INET_PROTOSW_PERMANENT & p->flags) {
 820                 pr_err("Attempt to unregister permanent protocol %d\n",
 821                        p->protocol);
 822         } else {
 823                 spin_lock_bh(&inetsw6_lock);
 824                 list_del_rcu(&p->list);
 825                 spin_unlock_bh(&inetsw6_lock);
 826
 827                 synchronize_net();
 828         }
 829 }
 830 EXPORT_SYMBOL(inet6_unregister_protosw);
 831
 832 int inet6_sk_rebuild_header(struct sock *sk)
 833 {
 834         struct ipv6_pinfo *np = inet6_sk(sk);
 835         struct dst_entry *dst;
 836
 837         dst = __sk_dst_check(sk, np->dst_cookie);
 838
 839         if (!dst) {
 840                 struct inet_sock *inet = inet_sk(sk);
 841                 struct in6_addr *final_p, final;
 842                 struct flowi6 fl6;
 843
 844                 memset(&fl6, 0, sizeof(fl6));
 845                 fl6.flowi6_proto = sk->sk_protocol;
 846                 fl6.daddr = sk->sk_v6_daddr;
 847                 fl6.saddr = np->saddr;
 848                 fl6.flowlabel = np->flow_label;
 849                 fl6.flowi6_oif = sk->sk_bound_dev_if;
 850                 fl6.flowi6_mark = sk->sk_mark;
 851                 fl6.fl6_dport = inet->inet_dport;
 852                 fl6.fl6_sport = inet->inet_sport;
 853                 fl6.flowi6_uid = sk->sk_uid;
 854                 security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6));
 855
 856                 rcu_read_lock();
 857                 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt),
 858                                          &final);
 859                 rcu_read_unlock();
 860
 861                 dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
 862                 if (IS_ERR(dst)) {
 863                         sk->sk_route_caps = 0;
 864                         sk->sk_err_soft = -PTR_ERR(dst);
 865                         return PTR_ERR(dst);
 866                 }
 867
 868                 ip6_dst_store(sk, dst, NULL, NULL);
 869         }
 870
 871         return 0;
 872 }
 873 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
 874
 875 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
 876                        const struct inet6_skb_parm *opt)
 877 {
 878         const struct ipv6_pinfo *np = inet6_sk(sk);
 879
 880         if (np->rxopt.all) {
 881                 if (((opt->flags & IP6SKB_HOPBYHOP) &&
 882                      (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) ||
 883                     (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) &&
 884                      np->rxopt.bits.rxflow) ||
 885                     (opt->srcrt && (np->rxopt.bits.srcrt ||
 886                      np->rxopt.bits.osrcrt)) ||
 887                     ((opt->dst1 || opt->dst0) &&
 888                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
 889                         return true;
 890         }
 891         return false;
 892 }
 893 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
 894
 895 static struct packet_type ipv6_packet_type __read_mostly = {
 896         .type = cpu_to_be16(ETH_P_IPV6),
 897         .func = ipv6_rcv,
 898         .list_func = ipv6_list_rcv,
 899 };
 900
 901 static int __init ipv6_packet_init(void)
 902 {
 903         dev_add_pack(&ipv6_packet_type);
 904         return 0;
 905 }
 906
 907 static void ipv6_packet_cleanup(void)
 908 {
 909         dev_remove_pack(&ipv6_packet_type);
 910 }
 911
 912 static int __net_init ipv6_init_mibs(struct net *net)
 913 {
 914         int i;
 915
 916         net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib);
 917         if (!net->mib.udp_stats_in6)
 918                 return -ENOMEM;
 919         net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib);
 920         if (!net->mib.udplite_stats_in6)
 921                 goto err_udplite_mib;
 922         net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib);
 923         if (!net->mib.ipv6_statistics)
 924                 goto err_ip_mib;
 925
 926         for_each_possible_cpu(i) {
 927                 struct ipstats_mib *af_inet6_stats;
 928                 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i);
 929                 u64_stats_init(&af_inet6_stats->syncp);
 930         }
 931
 932
 933         net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib);
 934         if (!net->mib.icmpv6_statistics)
 935                 goto err_icmp_mib;
 936         net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
 937                                                 GFP_KERNEL);
 938         if (!net->mib.icmpv6msg_statistics)
 939                 goto err_icmpmsg_mib;
 940         return 0;
 941
 942 err_icmpmsg_mib:
 943         free_percpu(net->mib.icmpv6_statistics);
 944 err_icmp_mib:
 945         free_percpu(net->mib.ipv6_statistics);
 946 err_ip_mib:
 947         free_percpu(net->mib.udplite_stats_in6);
 948 err_udplite_mib:
 949         free_percpu(net->mib.udp_stats_in6);
 950         return -ENOMEM;
 951 }
 952
 953 static void ipv6_cleanup_mibs(struct net *net)
 954 {
 955         free_percpu(net->mib.udp_stats_in6);
 956         free_percpu(net->mib.udplite_stats_in6);
 957         free_percpu(net->mib.ipv6_statistics);
 958         free_percpu(net->mib.icmpv6_statistics);
 959         kfree(net->mib.icmpv6msg_statistics);
 960 }
 961
 962 static int __net_init inet6_net_init(struct net *net)
 963 {
 964         int err = 0;
 965
 966         net->ipv6.sysctl.bindv6only = 0;
 967         net->ipv6.sysctl.icmpv6_time = 1*HZ;
 968         net->ipv6.sysctl.icmpv6_echo_ignore_all = 0;
 969         net->ipv6.sysctl.icmpv6_echo_ignore_multicast = 0;
 970         net->ipv6.sysctl.icmpv6_echo_ignore_anycast = 0;
 971
 972         /* By default, rate limit error messages.
 973          * Except for pmtu discovery, it would break it.
 974          * proc_do_large_bitmap needs pointer to the bitmap.
 975          */
 976         bitmap_set(net->ipv6.sysctl.icmpv6_ratemask, 0, ICMPV6_ERRMSG_MAX + 1);
 977         bitmap_clear(net->ipv6.sysctl.icmpv6_ratemask, ICMPV6_PKT_TOOBIG, 1);
 978         net->ipv6.sysctl.icmpv6_ratemask_ptr = net->ipv6.sysctl.icmpv6_ratemask;
 979
 980         net->ipv6.sysctl.flowlabel_consistency = 1;
 981         net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS;
 982         net->ipv6.sysctl.idgen_retries = 3;
 983         net->ipv6.sysctl.idgen_delay = 1 * HZ;
 984         net->ipv6.sysctl.flowlabel_state_ranges = 0;
 985         net->ipv6.sysctl.max_dst_opts_cnt = IP6_DEFAULT_MAX_DST_OPTS_CNT;
 986         net->ipv6.sysctl.max_hbh_opts_cnt = IP6_DEFAULT_MAX_HBH_OPTS_CNT;
 987         net->ipv6.sysctl.max_dst_opts_len = IP6_DEFAULT_MAX_DST_OPTS_LEN;
 988         net->ipv6.sysctl.max_hbh_opts_len = IP6_DEFAULT_MAX_HBH_OPTS_LEN;
 989         net->ipv6.sysctl.fib_notify_on_flag_change = 0;
 990         atomic_set(&net->ipv6.fib6_sernum, 1);
 991
 992         net->ipv6.sysctl.ioam6_id = IOAM6_DEFAULT_ID;
 993         net->ipv6.sysctl.ioam6_id_wide = IOAM6_DEFAULT_ID_WIDE;
 994
 995         err = ipv6_init_mibs(net);
 996         if (err)
 997                 return err;
 998 #ifdef CONFIG_PROC_FS
 999         err = udp6_proc_init(net);
1000         if (err)
1001                 goto out;
1002         err = tcp6_proc_init(net);
1003         if (err)
1004                 goto proc_tcp6_fail;
1005         err = ac6_proc_init(net);
1006         if (err)
1007                 goto proc_ac6_fail;
1008 #endif
1009         return err;
1010
1011 #ifdef CONFIG_PROC_FS
1012 proc_ac6_fail:
1013         tcp6_proc_exit(net);
1014 proc_tcp6_fail:
1015         udp6_proc_exit(net);
1016 out:
1017         ipv6_cleanup_mibs(net);
1018         return err;
1019 #endif
1020 }
1021
1022 static void __net_exit inet6_net_exit(struct net *net)
1023 {
1024 #ifdef CONFIG_PROC_FS
1025         udp6_proc_exit(net);
1026         tcp6_proc_exit(net);
1027         ac6_proc_exit(net);
1028 #endif
1029         ipv6_cleanup_mibs(net);
1030 }
1031
1032 static struct pernet_operations inet6_net_ops = {
1033         .init = inet6_net_init,
1034         .exit = inet6_net_exit,
1035 };
1036
1037 static int ipv6_route_input(struct sk_buff *skb)
1038 {
1039         ip6_route_input(skb);
1040         return skb_dst(skb)->error;
1041 }
1042
1043 static const struct ipv6_stub ipv6_stub_impl = {
1044         .ipv6_sock_mc_join = ipv6_sock_mc_join,
1045         .ipv6_sock_mc_drop = ipv6_sock_mc_drop,
1046         .ipv6_dst_lookup_flow = ip6_dst_lookup_flow,
1047         .ipv6_route_input  = ipv6_route_input,
1048         .fib6_get_table    = fib6_get_table,
1049         .fib6_table_lookup = fib6_table_lookup,
1050         .fib6_lookup       = fib6_lookup,
1051         .fib6_select_path  = fib6_select_path,
1052         .ip6_mtu_from_fib6 = ip6_mtu_from_fib6,
1053         .fib6_nh_init      = fib6_nh_init,
1054         .fib6_nh_release   = fib6_nh_release,
1055         .fib6_nh_release_dsts = fib6_nh_release_dsts,
1056         .fib6_update_sernum = fib6_update_sernum_stub,
1057         .fib6_rt_update    = fib6_rt_update,
1058         .ip6_del_rt        = ip6_del_rt,
1059         .udpv6_encap_enable = udpv6_encap_enable,
1060         .ndisc_send_na = ndisc_send_na,
1061 #if IS_ENABLED(CONFIG_XFRM)
1062         .xfrm6_local_rxpmtu = xfrm6_local_rxpmtu,
1063         .xfrm6_udp_encap_rcv = xfrm6_udp_encap_rcv,
1064         .xfrm6_rcv_encap = xfrm6_rcv_encap,
1065 #endif
1066         .nd_tbl = &nd_tbl,
1067         .ipv6_fragment = ip6_fragment,
1068         .ipv6_dev_find = ipv6_dev_find,
1069 };
1070
1071 static const struct ipv6_bpf_stub ipv6_bpf_stub_impl = {
1072         .inet6_bind = __inet6_bind,
1073         .udp6_lib_lookup = __udp6_lib_lookup,
1074         .ipv6_setsockopt = do_ipv6_setsockopt,
1075         .ipv6_getsockopt = do_ipv6_getsockopt,
1076 };
1077
1078 static int __init inet6_init(void)
1079 {
1080         struct list_head *r;
1081         int err = 0;
1082
1083         sock_skb_cb_check_size(sizeof(struct inet6_skb_parm));
1084
1085         /* Register the socket-side information for inet6_create.  */
1086         for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
1087                 INIT_LIST_HEAD(r);
1088
1089         raw_hashinfo_init(&raw_v6_hashinfo);
1090
1091         if (disable_ipv6_mod) {
1092                 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
1093                 goto out;
1094         }
1095
1096         err = proto_register(&tcpv6_prot, 1);
1097         if (err)
1098                 goto out;
1099
1100         err = proto_register(&udpv6_prot, 1);
1101         if (err)
1102                 goto out_unregister_tcp_proto;
1103
1104         err = proto_register(&udplitev6_prot, 1);
1105         if (err)
1106                 goto out_unregister_udp_proto;
1107
1108         err = proto_register(&rawv6_prot, 1);
1109         if (err)
1110                 goto out_unregister_udplite_proto;
1111
1112         err = proto_register(&pingv6_prot, 1);
1113         if (err)
1114                 goto out_unregister_raw_proto;
1115
1116         /* We MUST register RAW sockets before we create the ICMP6,
1117          * IGMP6, or NDISC control sockets.
1118          */
1119         err = rawv6_init();
1120         if (err)
1121                 goto out_unregister_ping_proto;
1122
1123         /* Register the family here so that the init calls below will
1124          * be able to create sockets. (?? is this dangerous ??)
1125          */
1126         err = sock_register(&inet6_family_ops);
1127         if (err)
1128                 goto out_sock_register_fail;
1129
1130         /*
1131          *      ipngwg API draft makes clear that the correct semantics
1132          *      for TCP and UDP is to consider one TCP and UDP instance
1133          *      in a host available by both INET and INET6 APIs and
1134          *      able to communicate via both network protocols.
1135          */
1136
1137         err = register_pernet_subsys(&inet6_net_ops);
1138         if (err)
1139                 goto register_pernet_fail;
1140         err = ip6_mr_init();
1141         if (err)
1142                 goto ipmr_fail;
1143         err = icmpv6_init();
1144         if (err)
1145                 goto icmp_fail;
1146         err = ndisc_init();
1147         if (err)
1148                 goto ndisc_fail;
1149         err = igmp6_init();
1150         if (err)
1151                 goto igmp_fail;
1152
1153         err = ipv6_netfilter_init();
1154         if (err)
1155                 goto netfilter_fail;
1156         /* Create /proc/foo6 entries. */
1157 #ifdef CONFIG_PROC_FS
1158         err = -ENOMEM;
1159         if (raw6_proc_init())
1160                 goto proc_raw6_fail;
1161         if (udplite6_proc_init())
1162                 goto proc_udplite6_fail;
1163         if (ipv6_misc_proc_init())
1164                 goto proc_misc6_fail;
1165         if (if6_proc_init())
1166                 goto proc_if6_fail;
1167 #endif
1168         err = ip6_route_init();
1169         if (err)
1170                 goto ip6_route_fail;
1171         err = ndisc_late_init();
1172         if (err)
1173                 goto ndisc_late_fail;
1174         err = ip6_flowlabel_init();
1175         if (err)
1176                 goto ip6_flowlabel_fail;
1177         err = ipv6_anycast_init();
1178         if (err)
1179                 goto ipv6_anycast_fail;
1180         err = addrconf_init();
1181         if (err)
1182                 goto addrconf_fail;
1183
1184         /* Init v6 extension headers. */
1185         err = ipv6_exthdrs_init();
1186         if (err)
1187                 goto ipv6_exthdrs_fail;
1188
1189         err = ipv6_frag_init();
1190         if (err)
1191                 goto ipv6_frag_fail;
1192
1193         /* Init v6 transport protocols. */
1194         err = udpv6_init();
1195         if (err)
1196                 goto udpv6_fail;
1197
1198         err = udplitev6_init();
1199         if (err)
1200                 goto udplitev6_fail;
1201
1202         err = udpv6_offload_init();
1203         if (err)
1204                 goto udpv6_offload_fail;
1205
1206         err = tcpv6_init();
1207         if (err)
1208                 goto tcpv6_fail;
1209
1210         err = ipv6_packet_init();
1211         if (err)
1212                 goto ipv6_packet_fail;
1213
1214         err = pingv6_init();
1215         if (err)
1216                 goto pingv6_fail;
1217
1218         err = calipso_init();
1219         if (err)
1220                 goto calipso_fail;
1221
1222         err = seg6_init();
1223         if (err)
1224                 goto seg6_fail;
1225
1226         err = rpl_init();
1227         if (err)
1228                 goto rpl_fail;
1229
1230         err = ioam6_init();
1231         if (err)
1232                 goto ioam6_fail;
1233
1234         err = igmp6_late_init();
1235         if (err)
1236                 goto igmp6_late_err;
1237
1238 #ifdef CONFIG_SYSCTL
1239         err = ipv6_sysctl_register();
1240         if (err)
1241                 goto sysctl_fail;
1242 #endif
1243
1244         /* ensure that ipv6 stubs are visible only after ipv6 is ready */
1245         wmb();
1246         ipv6_stub = &ipv6_stub_impl;
1247         ipv6_bpf_stub = &ipv6_bpf_stub_impl;
1248 out:
1249         return err;
1250
1251 #ifdef CONFIG_SYSCTL
1252 sysctl_fail:
1253         igmp6_late_cleanup();
1254 #endif
1255 igmp6_late_err:
1256         ioam6_exit();
1257 ioam6_fail:
1258         rpl_exit();
1259 rpl_fail:
1260         seg6_exit();
1261 seg6_fail:
1262         calipso_exit();
1263 calipso_fail:
1264         pingv6_exit();
1265 pingv6_fail:
1266         ipv6_packet_cleanup();
1267 ipv6_packet_fail:
1268         tcpv6_exit();
1269 tcpv6_fail:
1270         udpv6_offload_exit();
1271 udpv6_offload_fail:
1272         udplitev6_exit();
1273 udplitev6_fail:
1274         udpv6_exit();
1275 udpv6_fail:
1276         ipv6_frag_exit();
1277 ipv6_frag_fail:
1278         ipv6_exthdrs_exit();
1279 ipv6_exthdrs_fail:
1280         addrconf_cleanup();
1281 addrconf_fail:
1282         ipv6_anycast_cleanup();
1283 ipv6_anycast_fail:
1284         ip6_flowlabel_cleanup();
1285 ip6_flowlabel_fail:
1286         ndisc_late_cleanup();
1287 ndisc_late_fail:
1288         ip6_route_cleanup();
1289 ip6_route_fail:
1290 #ifdef CONFIG_PROC_FS
1291         if6_proc_exit();
1292 proc_if6_fail:
1293         ipv6_misc_proc_exit();
1294 proc_misc6_fail:
1295         udplite6_proc_exit();
1296 proc_udplite6_fail:
1297         raw6_proc_exit();
1298 proc_raw6_fail:
1299 #endif
1300         ipv6_netfilter_fini();
1301 netfilter_fail:
1302         igmp6_cleanup();
1303 igmp_fail:
1304         ndisc_cleanup();
1305 ndisc_fail:
1306         icmpv6_cleanup();
1307 icmp_fail:
1308         ip6_mr_cleanup();
1309 ipmr_fail:
1310         unregister_pernet_subsys(&inet6_net_ops);
1311 register_pernet_fail:
1312         sock_unregister(PF_INET6);
1313         rtnl_unregister_all(PF_INET6);
1314 out_sock_register_fail:
1315         rawv6_exit();
1316 out_unregister_ping_proto:
1317         proto_unregister(&pingv6_prot);
1318 out_unregister_raw_proto:
1319         proto_unregister(&rawv6_prot);
1320 out_unregister_udplite_proto:
1321         proto_unregister(&udplitev6_prot);
1322 out_unregister_udp_proto:
1323         proto_unregister(&udpv6_prot);
1324 out_unregister_tcp_proto:
1325         proto_unregister(&tcpv6_prot);
1326         goto out;
1327 }
1328 module_init(inet6_init);
1329
1330 MODULE_ALIAS_NETPROTO(PF_INET6);