net/ipv6/af_inet6.c

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