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