ipv6/af_inet6.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *      PF_INET6 socket protocol family
   4  *      Linux INET6 implementation
   5  *
   6  *      Authors:
   7  *      Pedro Roque             <roque@di.fc.ul.pt>
   8  *
   9  *      Adapted from linux/net/ipv4/af_inet.c
  10  *
  11  *      Fixes:
  12  *      piggy, Karl Knutson     :       Socket protocol table
  13  *      Hideaki YOSHIFUJI       :       sin6_scope_id support
  14  *      Arnaldo Melo            :       check proc_net_create return, cleanups
  15  */
  16
  17 #define pr_fmt(fmt) "IPv6: " fmt
  18
  19 #include <linux/module.h>
  20 #include <linux/capability.h>
  21 #include <linux/errno.h>
  22 #include <linux/types.h>
  23 #include <linux/socket.h>
  24 #include <linux/in.h>
  25 #include <linux/kernel.h>
  26 #include <linux/timer.h>
  27 #include <linux/string.h>
  28 #include <linux/sockios.h>
  29 #include <linux/net.h>
  30 #include <linux/fcntl.h>
  31 #include <linux/mm.h>
  32 #include <linux/interrupt.h>
  33 #include <linux/proc_fs.h>
  34 #include <linux/stat.h>
  35 #include <linux/init.h>
  36 #include <linux/slab.h>
  37
  38 #include <linux/inet.h>
  39 #include <linux/netdevice.h>
  40 #include <linux/icmpv6.h>
  41 #include <linux/netfilter_ipv6.h>
  42
  43 #include <net/ip.h>
  44 #include <net/ipv6.h>
  45 #include <net/udp.h>
  46 #include <net/udplite.h>
  47 #include <net/tcp.h>
  48 #include <net/ping.h>
  49 #include <net/protocol.h>
  50 #include <net/inet_common.h>
  51 #include <net/route.h>
  52 #include <net/transp_v6.h>
  53 #include <net/ip6_route.h>
  54 #include <net/addrconf.h>
  55 #include <net/ipv6_stubs.h>
  56 #include <net/ndisc.h>
  57 #ifdef CONFIG_IPV6_TUNNEL
  58 #include <net/ip6_tunnel.h>
  59 #endif
  60 #include <net/calipso.h>
  61 #include <net/seg6.h>
  62 #include <net/rpl.h>
  63 #include <net/compat.h>
  64 #include <net/xfrm.h>
  65 #include <net/ioam6.h>
  66 #include <net/rawv6.h>
  67
  68 #include <linux/uaccess.h>
  69 #include <linux/mroute6.h>
  70
  71 #include "ip6_offload.h"
  72
  73 MODULE_AUTHOR("Cast of dozens");
  74 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
  75 MODULE_LICENSE("GPL");
  76
  77 /* The inetsw6 table contains everything that inet6_create needs to
  78  * build a new socket.
  79  */
  80 static struct list_head inetsw6[SOCK_MAX];
  81 static DEFINE_SPINLOCK(inetsw6_lock);
  82
  83 struct ipv6_params ipv6_defaults = {
  84         .disable_ipv6 = 0,
  85         .autoconf = 1,
  86 };
  87
  88 static int disable_ipv6_mod;
  89
  90 module_param_named(disable, disable_ipv6_mod, int, 0444);
  91 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
  92
  93 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
  94 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
  95
  96 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
  97 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
  98
  99 bool ipv6_mod_enabled(void)
 100 {
 101         return disable_ipv6_mod == 0;
 102 }
 103 EXPORT_SYMBOL_GPL(ipv6_mod_enabled);
 104
 105 static struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
 106 {
 107         const int offset = sk->sk_prot->ipv6_pinfo_offset;
 108
 109         return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
 110 }
 111
 112 void inet6_sock_destruct(struct sock *sk)
 113 {
 114         inet6_cleanup_sock(sk);
 115         inet_sock_destruct(sk);
 116 }
 117 EXPORT_SYMBOL_GPL(inet6_sock_destruct);
 118
 119 static int inet6_create(struct net *net, struct socket *sock, int protocol,
 120                         int kern)
 121 {
 122         struct inet_sock *inet;
 123         struct ipv6_pinfo *np;
 124         struct sock *sk;
 125         struct inet_protosw *answer;
 126         struct proto *answer_prot;
 127         unsigned char answer_flags;
 128         int try_loading_module = 0;
 129         int err;
 130
 131         if (protocol < 0 || protocol >= IPPROTO_MAX)
 132                 return -EINVAL;
 133
 134         /* Look for the requested type/protocol pair. */
 135 lookup_protocol:
 136         err = -ESOCKTNOSUPPORT;
 137         rcu_read_lock();
 138         list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
 139
 140                 err = 0;
 141                 /* Check the non-wild match. */
 142                 if (protocol == answer->protocol) {
 143                         if (protocol != IPPROTO_IP)
 144                                 break;
 145                 } else {
 146                         /* Check for the two wild cases. */
 147                         if (IPPROTO_IP == protocol) {
 148                                 protocol = answer->protocol;
 149                                 break;
 150                         }
 151                         if (IPPROTO_IP == answer->protocol)
 152                                 break;
 153                 }
 154                 err = -EPROTONOSUPPORT;
 155         }
 156
 157         if (err) {
 158                 if (try_loading_module < 2) {
 159                         rcu_read_unlock();
 160                         /*
 161                          * Be more specific, e.g. net-pf-10-proto-132-type-1
 162                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
 163                          */
 164                         if (++try_loading_module == 1)
 165                                 request_module("net-pf-%d-proto-%d-type-%d",
 166                                                 PF_INET6, protocol, sock->type);
 167                         /*
 168                          * Fall back to generic, e.g. net-pf-10-proto-132
 169                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
 170                          */
 171                         else
 172                                 request_module("net-pf-%d-proto-%d",
 173                                                 PF_INET6, protocol);
 174                         goto lookup_protocol;
 175                 } else
 176                         goto out_rcu_unlock;
 177         }
 178
 179         err = -EPERM;
 180         if (sock->type == SOCK_RAW && !kern &&
 181             !ns_capable(net->user_ns, CAP_NET_RAW))
 182                 goto out_rcu_unlock;
 183
 184         sock->ops = answer->ops;
 185         answer_prot = answer->prot;
 186         answer_flags = answer->flags;
 187         rcu_read_unlock();
 188
 189         WARN_ON(!answer_prot->slab);
 190
 191         err = -ENOBUFS;
 192         sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern);
 193         if (!sk)
 194                 goto out;
 195
 196         sock_init_data(sock, sk);
 197
 198         err = 0;
 199         if (INET_PROTOSW_REUSE & answer_flags)
 200                 sk->sk_reuse = SK_CAN_REUSE;
 201
 202         if (INET_PROTOSW_ICSK & answer_flags)
 203                 inet_init_csk_locks(sk);
 204
 205         inet = inet_sk(sk);
 206         inet_assign_bit(IS_ICSK, sk, INET_PROTOSW_ICSK & answer_flags);
 207
 208         if (SOCK_RAW == sock->type) {
 209                 inet->inet_num = protocol;
 210                 if (IPPROTO_RAW == protocol)
 211                         inet_set_bit(HDRINCL, sk);
 212         }
 213
 214         sk->sk_destruct         = inet6_sock_destruct;
 215         sk->sk_family           = PF_INET6;
 216         sk->sk_protocol         = protocol;
 217
 218         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
 219
 220         inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
 221         np->hop_limit   = -1;
 222         np->mcast_hops  = IPV6_DEFAULT_MCASTHOPS;
 223         inet6_set_bit(MC6_LOOP, sk);
 224         inet6_set_bit(MC6_ALL, sk);
 225         np->pmtudisc    = IPV6_PMTUDISC_WANT;
 226         inet6_assign_bit(REPFLOW, sk, net->ipv6.sysctl.flowlabel_reflect &
 227                                      FLOWLABEL_REFLECT_ESTABLISHED);
 228         sk->sk_ipv6only = net->ipv6.sysctl.bindv6only;
 229         sk->sk_txrehash = READ_ONCE(net->core.sysctl_txrehash);
 230
 231         /* Init the ipv4 part of the socket since we can have sockets
 232          * using v6 API for ipv4.
 233          */
 234         inet->uc_ttl    = -1;
 235
 236         inet_set_bit(MC_LOOP, sk);
 237         inet->mc_ttl    = 1;
 238         inet->mc_index  = 0;
 239         RCU_INIT_POINTER(inet->mc_list, NULL);
 240         inet->rcv_tos   = 0;
 241
 242         if (READ_ONCE(net->ipv4.sysctl_ip_no_pmtu_disc))
 243                 inet->pmtudisc = IP_PMTUDISC_DONT;
 244         else
 245                 inet->pmtudisc = IP_PMTUDISC_WANT;
 246
 247         if (inet->inet_num) {
 248                 /* It assumes that any protocol which allows
 249                  * the user to assign a number at socket
 250                  * creation time automatically shares.
 251                  */
 252                 inet->inet_sport = htons(inet->inet_num);
 253                 err = sk->sk_prot->hash(sk);
 254                 if (err) {
 255                         sk_common_release(sk);
 256                         goto out;
 257                 }
 258         }
 259         if (sk->sk_prot->init) {
 260                 err = sk->sk_prot->init(sk);
 261                 if (err) {
 262                         sk_common_release(sk);
 263                         goto out;
 264                 }
 265         }
 266
 267         if (!kern) {
 268                 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
 269                 if (err) {
 270                         sk_common_release(sk);
 271                         goto out;
 272                 }
 273         }
 274 out:
 275         return err;
 276 out_rcu_unlock:
 277         rcu_read_unlock();
 278         goto out;
 279 }
 280
 281 static int __inet6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
 282                         u32 flags)
 283 {
 284         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
 285         struct inet_sock *inet = inet_sk(sk);
 286         struct ipv6_pinfo *np = inet6_sk(sk);
 287         struct net *net = sock_net(sk);
 288         __be32 v4addr = 0;
 289         unsigned short snum;
 290         bool saved_ipv6only;
 291         int addr_type = 0;
 292         int err = 0;
 293
 294         if (addr->sin6_family != AF_INET6)
 295                 return -EAFNOSUPPORT;
 296
 297         addr_type = ipv6_addr_type(&addr->sin6_addr);
 298         if ((addr_type & IPV6_ADDR_MULTICAST) && sk->sk_type == SOCK_STREAM)
 299                 return -EINVAL;
 300
 301         snum = ntohs(addr->sin6_port);
 302         if (!(flags & BIND_NO_CAP_NET_BIND_SERVICE) &&
 303             snum && inet_port_requires_bind_service(net, snum) &&
 304             !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
 305                 return -EACCES;
 306
 307         if (flags & BIND_WITH_LOCK)
 308                 lock_sock(sk);
 309
 310         /* Check these errors (active socket, double bind). */
 311         if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
 312                 err = -EINVAL;
 313                 goto out;
 314         }
 315
 316         /* Check if the address belongs to the host. */
 317         if (addr_type == IPV6_ADDR_MAPPED) {
 318                 struct net_device *dev = NULL;
 319                 int chk_addr_ret;
 320
 321                 /* Binding to v4-mapped address on a v6-only socket
 322                  * makes no sense
 323                  */
 324                 if (ipv6_only_sock(sk)) {
 325                         err = -EINVAL;
 326                         goto out;
 327                 }
 328
 329                 rcu_read_lock();
 330                 if (sk->sk_bound_dev_if) {
 331                         dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
 332                         if (!dev) {
 333                                 err = -ENODEV;
 334                                 goto out_unlock;
 335                         }
 336                 }
 337
 338                 /* Reproduce AF_INET checks to make the bindings consistent */
 339                 v4addr = addr->sin6_addr.s6_addr32[3];
 340                 chk_addr_ret = inet_addr_type_dev_table(net, dev, v4addr);
 341                 rcu_read_unlock();
 342
 343                 if (!inet_addr_valid_or_nonlocal(net, inet, v4addr,
 344                                                  chk_addr_ret)) {
 345                         err = -EADDRNOTAVAIL;
 346                         goto out;
 347                 }
 348         } else {
 349                 if (addr_type != IPV6_ADDR_ANY) {
 350                         struct net_device *dev = NULL;
 351
 352                         rcu_read_lock();
 353                         if (__ipv6_addr_needs_scope_id(addr_type)) {
 354                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 355                                     addr->sin6_scope_id) {
 356                                         /* Override any existing binding, if another one
 357                                          * is supplied by user.
 358                                          */
 359                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
 360                                 }
 361
 362                                 /* Binding to link-local address requires an interface */
 363                                 if (!sk->sk_bound_dev_if) {
 364                                         err = -EINVAL;
 365                                         goto out_unlock;
 366                                 }
 367                         }
 368
 369                         if (sk->sk_bound_dev_if) {
 370                                 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
 371                                 if (!dev) {
 372                                         err = -ENODEV;
 373                                         goto out_unlock;
 374                                 }
 375                         }
 376
 377                         /* ipv4 addr of the socket is invalid.  Only the
 378                          * unspecified and mapped address have a v4 equivalent.
 379                          */
 380                         v4addr = LOOPBACK4_IPV6;
 381                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
 382                                 if (!ipv6_can_nonlocal_bind(net, inet) &&
 383                                     !ipv6_chk_addr(net, &addr->sin6_addr,
 384                                                    dev, 0)) {
 385                                         err = -EADDRNOTAVAIL;
 386                                         goto out_unlock;
 387                                 }
 388                         }
 389                         rcu_read_unlock();
 390                 }
 391         }
 392
 393         inet->inet_rcv_saddr = v4addr;
 394         inet->inet_saddr = v4addr;
 395
 396         sk->sk_v6_rcv_saddr = addr->sin6_addr;
 397
 398         if (!(addr_type & IPV6_ADDR_MULTICAST))
 399                 np->saddr = addr->sin6_addr;
 400
 401         saved_ipv6only = sk->sk_ipv6only;
 402         if (addr_type != IPV6_ADDR_ANY && addr_type != IPV6_ADDR_MAPPED)
 403                 sk->sk_ipv6only = 1;
 404
 405         /* Make sure we are allowed to bind here. */
 406         if (snum || !(inet_test_bit(BIND_ADDRESS_NO_PORT, sk) ||
 407                       (flags & BIND_FORCE_ADDRESS_NO_PORT))) {
 408                 err = sk->sk_prot->get_port(sk, snum);
 409                 if (err) {
 410                         sk->sk_ipv6only = saved_ipv6only;
 411                         inet_reset_saddr(sk);
 412                         goto out;
 413                 }
 414                 if (!(flags & BIND_FROM_BPF)) {
 415                         err = BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk);
 416                         if (err) {
 417                                 sk->sk_ipv6only = saved_ipv6only;
 418                                 inet_reset_saddr(sk);
 419                                 if (sk->sk_prot->put_port)
 420                                         sk->sk_prot->put_port(sk);
 421                                 goto out;
 422                         }
 423                 }
 424         }
 425
 426         if (addr_type != IPV6_ADDR_ANY)
 427                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
 428         if (snum)
 429                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
 430         inet->inet_sport = htons(inet->inet_num);
 431         inet->inet_dport = 0;
 432         inet->inet_daddr = 0;
 433 out:
 434         if (flags & BIND_WITH_LOCK)
 435                 release_sock(sk);
 436         return err;
 437 out_unlock:
 438         rcu_read_unlock();
 439         goto out;
 440 }
 441
 442 int inet6_bind_sk(struct sock *sk, struct sockaddr *uaddr, int addr_len)
 443 {
 444         u32 flags = BIND_WITH_LOCK;
 445         const struct proto *prot;
 446         int err = 0;
 447
 448         /* IPV6_ADDRFORM can change sk->sk_prot under us. */
 449         prot = READ_ONCE(sk->sk_prot);
 450         /* If the socket has its own bind function then use it. */
 451         if (prot->bind)
 452                 return prot->bind(sk, uaddr, addr_len);
 453
 454         if (addr_len < SIN6_LEN_RFC2133)
 455                 return -EINVAL;
 456
 457         /* BPF prog is run before any checks are done so that if the prog
 458          * changes context in a wrong way it will be caught.
 459          */
 460         err = BPF_CGROUP_RUN_PROG_INET_BIND_LOCK(sk, uaddr, &addr_len,
 461                                                  CGROUP_INET6_BIND, &flags);
 462         if (err)
 463                 return err;
 464
 465         return __inet6_bind(sk, uaddr, addr_len, flags);
 466 }
 467
 468 /* bind for INET6 API */
 469 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 470 {
 471         return inet6_bind_sk(sock->sk, uaddr, addr_len);
 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_cleanup_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_cleanup_sock);
 518
 519 /*
 520  *      This does both peername and sockname.
 521  */
 522 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 523                   int peer)
 524 {
 525         struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
 526         int sin_addr_len = sizeof(*sin);
 527         struct sock *sk = sock->sk;
 528         struct inet_sock *inet = inet_sk(sk);
 529         struct ipv6_pinfo *np = inet6_sk(sk);
 530
 531         sin->sin6_family = AF_INET6;
 532         sin->sin6_flowinfo = 0;
 533         sin->sin6_scope_id = 0;
 534         lock_sock(sk);
 535         if (peer) {
 536                 if (!inet->inet_dport ||
 537                     (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
 538                     peer == 1)) {
 539                         release_sock(sk);
 540                         return -ENOTCONN;
 541                 }
 542                 sin->sin6_port = inet->inet_dport;
 543                 sin->sin6_addr = sk->sk_v6_daddr;
 544                 if (inet6_test_bit(SNDFLOW, sk))
 545                         sin->sin6_flowinfo = np->flow_label;
 546                 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin, &sin_addr_len,
 547                                        CGROUP_INET6_GETPEERNAME);
 548         } else {
 549                 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
 550                         sin->sin6_addr = np->saddr;
 551                 else
 552                         sin->sin6_addr = sk->sk_v6_rcv_saddr;
 553                 sin->sin6_port = inet->inet_sport;
 554                 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin, &sin_addr_len,
 555                                        CGROUP_INET6_GETSOCKNAME);
 556         }
 557         sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
 558                                                  sk->sk_bound_dev_if);
 559         release_sock(sk);
 560         return sin_addr_len;
 561 }
 562 EXPORT_SYMBOL(inet6_getname);
 563
 564 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 565 {
 566         void __user *argp = (void __user *)arg;
 567         struct sock *sk = sock->sk;
 568         struct net *net = sock_net(sk);
 569         const struct proto *prot;
 570
 571         switch (cmd) {
 572         case SIOCADDRT:
 573         case SIOCDELRT: {
 574                 struct in6_rtmsg rtmsg;
 575
 576                 if (copy_from_user(&rtmsg, argp, sizeof(rtmsg)))
 577                         return -EFAULT;
 578                 return ipv6_route_ioctl(net, cmd, &rtmsg);
 579         }
 580         case SIOCSIFADDR:
 581                 return addrconf_add_ifaddr(net, argp);
 582         case SIOCDIFADDR:
 583                 return addrconf_del_ifaddr(net, argp);
 584         case SIOCSIFDSTADDR:
 585                 return addrconf_set_dstaddr(net, argp);
 586         default:
 587                 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
 588                 prot = READ_ONCE(sk->sk_prot);
 589                 if (!prot->ioctl)
 590                         return -ENOIOCTLCMD;
 591                 return sk_ioctl(sk, cmd, (void __user *)arg);
 592         }
 593         /*NOTREACHED*/
 594         return 0;
 595 }
 596 EXPORT_SYMBOL(inet6_ioctl);
 597
 598 #ifdef CONFIG_COMPAT
 599 struct compat_in6_rtmsg {
 600         struct in6_addr         rtmsg_dst;
 601         struct in6_addr         rtmsg_src;
 602         struct in6_addr         rtmsg_gateway;
 603         u32                     rtmsg_type;
 604         u16                     rtmsg_dst_len;
 605         u16                     rtmsg_src_len;
 606         u32                     rtmsg_metric;
 607         u32                     rtmsg_info;
 608         u32                     rtmsg_flags;
 609         s32                     rtmsg_ifindex;
 610 };
 611
 612 static int inet6_compat_routing_ioctl(struct sock *sk, unsigned int cmd,
 613                 struct compat_in6_rtmsg __user *ur)
 614 {
 615         struct in6_rtmsg rt;
 616
 617         if (copy_from_user(&rt.rtmsg_dst, &ur->rtmsg_dst,
 618                         3 * sizeof(struct in6_addr)) ||
 619             get_user(rt.rtmsg_type, &ur->rtmsg_type) ||
 620             get_user(rt.rtmsg_dst_len, &ur->rtmsg_dst_len) ||
 621             get_user(rt.rtmsg_src_len, &ur->rtmsg_src_len) ||
 622             get_user(rt.rtmsg_metric, &ur->rtmsg_metric) ||
 623             get_user(rt.rtmsg_info, &ur->rtmsg_info) ||
 624             get_user(rt.rtmsg_flags, &ur->rtmsg_flags) ||
 625             get_user(rt.rtmsg_ifindex, &ur->rtmsg_ifindex))
 626                 return -EFAULT;
 627
 628
 629         return ipv6_route_ioctl(sock_net(sk), cmd, &rt);
 630 }
 631
 632 int inet6_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 633 {
 634         void __user *argp = compat_ptr(arg);
 635         struct sock *sk = sock->sk;
 636
 637         switch (cmd) {
 638         case SIOCADDRT:
 639         case SIOCDELRT:
 640                 return inet6_compat_routing_ioctl(sk, cmd, argp);
 641         default:
 642                 return -ENOIOCTLCMD;
 643         }
 644 }
 645 EXPORT_SYMBOL_GPL(inet6_compat_ioctl);
 646 #endif /* CONFIG_COMPAT */
 647
 648 INDIRECT_CALLABLE_DECLARE(int udpv6_sendmsg(struct sock *, struct msghdr *,
 649                                             size_t));
 650 int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
 651 {
 652         struct sock *sk = sock->sk;
 653         const struct proto *prot;
 654
 655         if (unlikely(inet_send_prepare(sk)))
 656                 return -EAGAIN;
 657
 658         /* IPV6_ADDRFORM can change sk->sk_prot under us. */
 659         prot = READ_ONCE(sk->sk_prot);
 660         return INDIRECT_CALL_2(prot->sendmsg, tcp_sendmsg, udpv6_sendmsg,
 661                                sk, msg, size);
 662 }
 663
 664 INDIRECT_CALLABLE_DECLARE(int udpv6_recvmsg(struct sock *, struct msghdr *,
 665                                             size_t, int, int *));
 666 int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
 667                   int flags)
 668 {
 669         struct sock *sk = sock->sk;
 670         const struct proto *prot;
 671         int addr_len = 0;
 672         int err;
 673
 674         if (likely(!(flags & MSG_ERRQUEUE)))
 675                 sock_rps_record_flow(sk);
 676
 677         /* IPV6_ADDRFORM can change sk->sk_prot under us. */
 678         prot = READ_ONCE(sk->sk_prot);
 679         err = INDIRECT_CALL_2(prot->recvmsg, tcp_recvmsg, udpv6_recvmsg,
 680                               sk, msg, size, flags, &addr_len);
 681         if (err >= 0)
 682                 msg->msg_namelen = addr_len;
 683         return err;
 684 }
 685
 686 const struct proto_ops inet6_stream_ops = {
 687         .family            = PF_INET6,
 688         .owner             = THIS_MODULE,
 689         .release           = inet6_release,
 690         .bind              = inet6_bind,
 691         .connect           = inet_stream_connect,       /* ok           */
 692         .socketpair        = sock_no_socketpair,        /* a do nothing */
 693         .accept            = inet_accept,               /* ok           */
 694         .getname           = inet6_getname,
 695         .poll              = tcp_poll,                  /* ok           */
 696         .ioctl             = inet6_ioctl,               /* must change  */
 697         .gettstamp         = sock_gettstamp,
 698         .listen            = inet_listen,               /* ok           */
 699         .shutdown          = inet_shutdown,             /* ok           */
 700         .setsockopt        = sock_common_setsockopt,    /* ok           */
 701         .getsockopt        = sock_common_getsockopt,    /* ok           */
 702         .sendmsg           = inet6_sendmsg,             /* retpoline's sake */
 703         .recvmsg           = inet6_recvmsg,             /* retpoline's sake */
 704 #ifdef CONFIG_MMU
 705         .mmap              = tcp_mmap,
 706 #endif
 707         .splice_eof        = inet_splice_eof,
 708         .sendmsg_locked    = tcp_sendmsg_locked,
 709         .splice_read       = tcp_splice_read,
 710         .read_sock         = tcp_read_sock,
 711         .read_skb          = tcp_read_skb,
 712         .peek_len          = tcp_peek_len,
 713 #ifdef CONFIG_COMPAT
 714         .compat_ioctl      = inet6_compat_ioctl,
 715 #endif
 716         .set_rcvlowat      = tcp_set_rcvlowat,
 717 };
 718
 719 const struct proto_ops inet6_dgram_ops = {
 720         .family            = PF_INET6,
 721         .owner             = THIS_MODULE,
 722         .release           = inet6_release,
 723         .bind              = inet6_bind,
 724         .connect           = inet_dgram_connect,        /* ok           */
 725         .socketpair        = sock_no_socketpair,        /* a do nothing */
 726         .accept            = sock_no_accept,            /* a do nothing */
 727         .getname           = inet6_getname,
 728         .poll              = udp_poll,                  /* ok           */
 729         .ioctl             = inet6_ioctl,               /* must change  */
 730         .gettstamp         = sock_gettstamp,
 731         .listen            = sock_no_listen,            /* ok           */
 732         .shutdown          = inet_shutdown,             /* ok           */
 733         .setsockopt        = sock_common_setsockopt,    /* ok           */
 734         .getsockopt        = sock_common_getsockopt,    /* ok           */
 735         .sendmsg           = inet6_sendmsg,             /* retpoline's sake */
 736         .recvmsg           = inet6_recvmsg,             /* retpoline's sake */
 737         .read_skb          = udp_read_skb,
 738         .mmap              = sock_no_mmap,
 739         .set_peek_off      = sk_set_peek_off,
 740 #ifdef CONFIG_COMPAT
 741         .compat_ioctl      = inet6_compat_ioctl,
 742 #endif
 743 };
 744
 745 static const struct net_proto_family inet6_family_ops = {
 746         .family = PF_INET6,
 747         .create = inet6_create,
 748         .owner  = THIS_MODULE,
 749 };
 750
 751 int inet6_register_protosw(struct inet_protosw *p)
 752 {
 753         struct list_head *lh;
 754         struct inet_protosw *answer;
 755         struct list_head *last_perm;
 756         int protocol = p->protocol;
 757         int ret;
 758
 759         spin_lock_bh(&inetsw6_lock);
 760
 761         ret = -EINVAL;
 762         if (p->type >= SOCK_MAX)
 763                 goto out_illegal;
 764
 765         /* If we are trying to override a permanent protocol, bail. */
 766         answer = NULL;
 767         ret = -EPERM;
 768         last_perm = &inetsw6[p->type];
 769         list_for_each(lh, &inetsw6[p->type]) {
 770                 answer = list_entry(lh, struct inet_protosw, list);
 771
 772                 /* Check only the non-wild match. */
 773                 if (INET_PROTOSW_PERMANENT & answer->flags) {
 774                         if (protocol == answer->protocol)
 775                                 break;
 776                         last_perm = lh;
 777                 }
 778
 779                 answer = NULL;
 780         }
 781         if (answer)
 782                 goto out_permanent;
 783
 784         /* Add the new entry after the last permanent entry if any, so that
 785          * the new entry does not override a permanent entry when matched with
 786          * a wild-card protocol. But it is allowed to override any existing
 787          * non-permanent entry.  This means that when we remove this entry, the
 788          * system automatically returns to the old behavior.
 789          */
 790         list_add_rcu(&p->list, last_perm);
 791         ret = 0;
 792 out:
 793         spin_unlock_bh(&inetsw6_lock);
 794         return ret;
 795
 796 out_permanent:
 797         pr_err("Attempt to override permanent protocol %d\n", protocol);
 798         goto out;
 799
 800 out_illegal:
 801         pr_err("Ignoring attempt to register invalid socket type %d\n",
 802                p->type);
 803         goto out;
 804 }
 805 EXPORT_SYMBOL(inet6_register_protosw);
 806
 807 void
 808 inet6_unregister_protosw(struct inet_protosw *p)
 809 {
 810         if (INET_PROTOSW_PERMANENT & p->flags) {
 811                 pr_err("Attempt to unregister permanent protocol %d\n",
 812                        p->protocol);
 813         } else {
 814                 spin_lock_bh(&inetsw6_lock);
 815                 list_del_rcu(&p->list);
 816                 spin_unlock_bh(&inetsw6_lock);
 817
 818                 synchronize_net();
 819         }
 820 }
 821 EXPORT_SYMBOL(inet6_unregister_protosw);
 822
 823 int inet6_sk_rebuild_header(struct sock *sk)
 824 {
 825         struct ipv6_pinfo *np = inet6_sk(sk);
 826         struct dst_entry *dst;
 827
 828         dst = __sk_dst_check(sk, np->dst_cookie);
 829
 830         if (!dst) {
 831                 struct inet_sock *inet = inet_sk(sk);
 832                 struct in6_addr *final_p, final;
 833                 struct flowi6 fl6;
 834
 835                 memset(&fl6, 0, sizeof(fl6));
 836                 fl6.flowi6_proto = sk->sk_protocol;
 837                 fl6.daddr = sk->sk_v6_daddr;
 838                 fl6.saddr = np->saddr;
 839                 fl6.flowlabel = np->flow_label;
 840                 fl6.flowi6_oif = sk->sk_bound_dev_if;
 841                 fl6.flowi6_mark = sk->sk_mark;
 842                 fl6.fl6_dport = inet->inet_dport;
 843                 fl6.fl6_sport = inet->inet_sport;
 844                 fl6.flowi6_uid = sk->sk_uid;
 845                 security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6));
 846
 847                 rcu_read_lock();
 848                 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt),
 849                                          &final);
 850                 rcu_read_unlock();
 851
 852                 dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
 853                 if (IS_ERR(dst)) {
 854                         sk->sk_route_caps = 0;
 855                         WRITE_ONCE(sk->sk_err_soft, -PTR_ERR(dst));
 856                         return PTR_ERR(dst);
 857                 }
 858
 859                 ip6_dst_store(sk, dst, NULL, NULL);
 860         }
 861
 862         return 0;
 863 }
 864 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
 865
 866 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
 867                        const struct inet6_skb_parm *opt)
 868 {
 869         const struct ipv6_pinfo *np = inet6_sk(sk);
 870
 871         if (np->rxopt.all) {
 872                 if (((opt->flags & IP6SKB_HOPBYHOP) &&
 873                      (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) ||
 874                     (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) &&
 875                      np->rxopt.bits.rxflow) ||
 876                     (opt->srcrt && (np->rxopt.bits.srcrt ||
 877                      np->rxopt.bits.osrcrt)) ||
 878                     ((opt->dst1 || opt->dst0) &&
 879                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
 880                         return true;
 881         }
 882         return false;
 883 }
 884 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
 885
 886 static struct packet_type ipv6_packet_type __read_mostly = {
 887         .type = cpu_to_be16(ETH_P_IPV6),
 888         .func = ipv6_rcv,
 889         .list_func = ipv6_list_rcv,
 890 };
 891
 892 static int __init ipv6_packet_init(void)
 893 {
 894         dev_add_pack(&ipv6_packet_type);
 895         return 0;
 896 }
 897
 898 static void ipv6_packet_cleanup(void)
 899 {
 900         dev_remove_pack(&ipv6_packet_type);
 901 }
 902
 903 static int __net_init ipv6_init_mibs(struct net *net)
 904 {
 905         int i;
 906
 907         net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib);
 908         if (!net->mib.udp_stats_in6)
 909                 return -ENOMEM;
 910         net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib);
 911         if (!net->mib.udplite_stats_in6)
 912                 goto err_udplite_mib;
 913         net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib);
 914         if (!net->mib.ipv6_statistics)
 915                 goto err_ip_mib;
 916
 917         for_each_possible_cpu(i) {
 918                 struct ipstats_mib *af_inet6_stats;
 919                 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i);
 920                 u64_stats_init(&af_inet6_stats->syncp);
 921         }
 922
 923
 924         net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib);
 925         if (!net->mib.icmpv6_statistics)
 926                 goto err_icmp_mib;
 927         net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
 928                                                 GFP_KERNEL);
 929         if (!net->mib.icmpv6msg_statistics)
 930                 goto err_icmpmsg_mib;
 931         return 0;
 932
 933 err_icmpmsg_mib:
 934         free_percpu(net->mib.icmpv6_statistics);
 935 err_icmp_mib:
 936         free_percpu(net->mib.ipv6_statistics);
 937 err_ip_mib:
 938         free_percpu(net->mib.udplite_stats_in6);
 939 err_udplite_mib:
 940         free_percpu(net->mib.udp_stats_in6);
 941         return -ENOMEM;
 942 }
 943
 944 static void ipv6_cleanup_mibs(struct net *net)
 945 {
 946         free_percpu(net->mib.udp_stats_in6);
 947         free_percpu(net->mib.udplite_stats_in6);
 948         free_percpu(net->mib.ipv6_statistics);
 949         free_percpu(net->mib.icmpv6_statistics);
 950         kfree(net->mib.icmpv6msg_statistics);
 951 }
 952
 953 static int __net_init inet6_net_init(struct net *net)
 954 {
 955         int err = 0;
 956
 957         net->ipv6.sysctl.bindv6only = 0;
 958         net->ipv6.sysctl.icmpv6_time = 1*HZ;
 959         net->ipv6.sysctl.icmpv6_echo_ignore_all = 0;
 960         net->ipv6.sysctl.icmpv6_echo_ignore_multicast = 0;
 961         net->ipv6.sysctl.icmpv6_echo_ignore_anycast = 0;
 962         net->ipv6.sysctl.icmpv6_error_anycast_as_unicast = 0;
 963
 964         /* By default, rate limit error messages.
 965          * Except for pmtu discovery, it would break it.
 966          * proc_do_large_bitmap needs pointer to the bitmap.
 967          */
 968         bitmap_set(net->ipv6.sysctl.icmpv6_ratemask, 0, ICMPV6_ERRMSG_MAX + 1);
 969         bitmap_clear(net->ipv6.sysctl.icmpv6_ratemask, ICMPV6_PKT_TOOBIG, 1);
 970         net->ipv6.sysctl.icmpv6_ratemask_ptr = net->ipv6.sysctl.icmpv6_ratemask;
 971
 972         net->ipv6.sysctl.flowlabel_consistency = 1;
 973         net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS;
 974         net->ipv6.sysctl.idgen_retries = 3;
 975         net->ipv6.sysctl.idgen_delay = 1 * HZ;
 976         net->ipv6.sysctl.flowlabel_state_ranges = 0;
 977         net->ipv6.sysctl.max_dst_opts_cnt = IP6_DEFAULT_MAX_DST_OPTS_CNT;
 978         net->ipv6.sysctl.max_hbh_opts_cnt = IP6_DEFAULT_MAX_HBH_OPTS_CNT;
 979         net->ipv6.sysctl.max_dst_opts_len = IP6_DEFAULT_MAX_DST_OPTS_LEN;
 980         net->ipv6.sysctl.max_hbh_opts_len = IP6_DEFAULT_MAX_HBH_OPTS_LEN;
 981         net->ipv6.sysctl.fib_notify_on_flag_change = 0;
 982         atomic_set(&net->ipv6.fib6_sernum, 1);
 983
 984         net->ipv6.sysctl.ioam6_id = IOAM6_DEFAULT_ID;
 985         net->ipv6.sysctl.ioam6_id_wide = IOAM6_DEFAULT_ID_WIDE;
 986
 987         err = ipv6_init_mibs(net);
 988         if (err)
 989                 return err;
 990 #ifdef CONFIG_PROC_FS
 991         err = udp6_proc_init(net);
 992         if (err)
 993                 goto out;
 994         err = tcp6_proc_init(net);
 995         if (err)
 996                 goto proc_tcp6_fail;
 997         err = ac6_proc_init(net);
 998         if (err)
 999                 goto proc_ac6_fail;
1000 #endif
1001         return err;
1002
1003 #ifdef CONFIG_PROC_FS
1004 proc_ac6_fail:
1005         tcp6_proc_exit(net);
1006 proc_tcp6_fail:
1007         udp6_proc_exit(net);
1008 out:
1009         ipv6_cleanup_mibs(net);
1010         return err;
1011 #endif
1012 }
1013
1014 static void __net_exit inet6_net_exit(struct net *net)
1015 {
1016 #ifdef CONFIG_PROC_FS
1017         udp6_proc_exit(net);
1018         tcp6_proc_exit(net);
1019         ac6_proc_exit(net);
1020 #endif
1021         ipv6_cleanup_mibs(net);
1022 }
1023
1024 static struct pernet_operations inet6_net_ops = {
1025         .init = inet6_net_init,
1026         .exit = inet6_net_exit,
1027 };
1028
1029 static int ipv6_route_input(struct sk_buff *skb)
1030 {
1031         ip6_route_input(skb);
1032         return skb_dst(skb)->error;
1033 }
1034
1035 static const struct ipv6_stub ipv6_stub_impl = {
1036         .ipv6_sock_mc_join = ipv6_sock_mc_join,
1037         .ipv6_sock_mc_drop = ipv6_sock_mc_drop,
1038         .ipv6_dst_lookup_flow = ip6_dst_lookup_flow,
1039         .ipv6_route_input  = ipv6_route_input,
1040         .fib6_get_table    = fib6_get_table,
1041         .fib6_table_lookup = fib6_table_lookup,
1042         .fib6_lookup       = fib6_lookup,
1043         .fib6_select_path  = fib6_select_path,
1044         .ip6_mtu_from_fib6 = ip6_mtu_from_fib6,
1045         .fib6_nh_init      = fib6_nh_init,
1046         .fib6_nh_release   = fib6_nh_release,
1047         .fib6_nh_release_dsts = fib6_nh_release_dsts,
1048         .fib6_update_sernum = fib6_update_sernum_stub,
1049         .fib6_rt_update    = fib6_rt_update,
1050         .ip6_del_rt        = ip6_del_rt,
1051         .udpv6_encap_enable = udpv6_encap_enable,
1052         .ndisc_send_na = ndisc_send_na,
1053 #if IS_ENABLED(CONFIG_XFRM)
1054         .xfrm6_local_rxpmtu = xfrm6_local_rxpmtu,
1055         .xfrm6_udp_encap_rcv = xfrm6_udp_encap_rcv,
1056         .xfrm6_gro_udp_encap_rcv = xfrm6_gro_udp_encap_rcv,
1057         .xfrm6_rcv_encap = xfrm6_rcv_encap,
1058 #endif
1059         .nd_tbl = &nd_tbl,
1060         .ipv6_fragment = ip6_fragment,
1061         .ipv6_dev_find = ipv6_dev_find,
1062 };
1063
1064 static const struct ipv6_bpf_stub ipv6_bpf_stub_impl = {
1065         .inet6_bind = __inet6_bind,
1066         .udp6_lib_lookup = __udp6_lib_lookup,
1067         .ipv6_setsockopt = do_ipv6_setsockopt,
1068         .ipv6_getsockopt = do_ipv6_getsockopt,
1069         .ipv6_dev_get_saddr = ipv6_dev_get_saddr,
1070 };
1071
1072 static int __init inet6_init(void)
1073 {
1074         struct list_head *r;
1075         int err = 0;
1076
1077         sock_skb_cb_check_size(sizeof(struct inet6_skb_parm));
1078
1079         /* Register the socket-side information for inet6_create.  */
1080         for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
1081                 INIT_LIST_HEAD(r);
1082
1083         raw_hashinfo_init(&raw_v6_hashinfo);
1084
1085         if (disable_ipv6_mod) {
1086                 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
1087                 goto out;
1088         }
1089
1090         err = proto_register(&tcpv6_prot, 1);
1091         if (err)
1092                 goto out;
1093
1094         err = proto_register(&udpv6_prot, 1);
1095         if (err)
1096                 goto out_unregister_tcp_proto;
1097
1098         err = proto_register(&udplitev6_prot, 1);
1099         if (err)
1100                 goto out_unregister_udp_proto;
1101
1102         err = proto_register(&rawv6_prot, 1);
1103         if (err)
1104                 goto out_unregister_udplite_proto;
1105
1106         err = proto_register(&pingv6_prot, 1);
1107         if (err)
1108                 goto out_unregister_raw_proto;
1109
1110         /* We MUST register RAW sockets before we create the ICMP6,
1111          * IGMP6, or NDISC control sockets.
1112          */
1113         err = rawv6_init();
1114         if (err)
1115                 goto out_unregister_ping_proto;
1116
1117         /* Register the family here so that the init calls below will
1118          * be able to create sockets. (?? is this dangerous ??)
1119          */
1120         err = sock_register(&inet6_family_ops);
1121         if (err)
1122                 goto out_sock_register_fail;
1123
1124         /*
1125          *      ipngwg API draft makes clear that the correct semantics
1126          *      for TCP and UDP is to consider one TCP and UDP instance
1127          *      in a host available by both INET and INET6 APIs and
1128          *      able to communicate via both network protocols.
1129          */
1130
1131         err = register_pernet_subsys(&inet6_net_ops);
1132         if (err)
1133                 goto register_pernet_fail;
1134         err = ip6_mr_init();
1135         if (err)
1136                 goto ipmr_fail;
1137         err = icmpv6_init();
1138         if (err)
1139                 goto icmp_fail;
1140         err = ndisc_init();
1141         if (err)
1142                 goto ndisc_fail;
1143         err = igmp6_init();
1144         if (err)
1145                 goto igmp_fail;
1146
1147         err = ipv6_netfilter_init();
1148         if (err)
1149                 goto netfilter_fail;
1150         /* Create /proc/foo6 entries. */
1151 #ifdef CONFIG_PROC_FS
1152         err = -ENOMEM;
1153         if (raw6_proc_init())
1154                 goto proc_raw6_fail;
1155         if (udplite6_proc_init())
1156                 goto proc_udplite6_fail;
1157         if (ipv6_misc_proc_init())
1158                 goto proc_misc6_fail;
1159         if (if6_proc_init())
1160                 goto proc_if6_fail;
1161 #endif
1162         err = ip6_route_init();
1163         if (err)
1164                 goto ip6_route_fail;
1165         err = ndisc_late_init();
1166         if (err)
1167                 goto ndisc_late_fail;
1168         err = ip6_flowlabel_init();
1169         if (err)
1170                 goto ip6_flowlabel_fail;
1171         err = ipv6_anycast_init();
1172         if (err)
1173                 goto ipv6_anycast_fail;
1174         err = addrconf_init();
1175         if (err)
1176                 goto addrconf_fail;
1177
1178         /* Init v6 extension headers. */
1179         err = ipv6_exthdrs_init();
1180         if (err)
1181                 goto ipv6_exthdrs_fail;
1182
1183         err = ipv6_frag_init();
1184         if (err)
1185                 goto ipv6_frag_fail;
1186
1187         /* Init v6 transport protocols. */
1188         err = udpv6_init();
1189         if (err)
1190                 goto udpv6_fail;
1191
1192         err = udplitev6_init();
1193         if (err)
1194                 goto udplitev6_fail;
1195
1196         err = udpv6_offload_init();
1197         if (err)
1198                 goto udpv6_offload_fail;
1199
1200         err = tcpv6_init();
1201         if (err)
1202                 goto tcpv6_fail;
1203
1204         err = ipv6_packet_init();
1205         if (err)
1206                 goto ipv6_packet_fail;
1207
1208         err = pingv6_init();
1209         if (err)
1210                 goto pingv6_fail;
1211
1212         err = calipso_init();
1213         if (err)
1214                 goto calipso_fail;
1215
1216         err = seg6_init();
1217         if (err)
1218                 goto seg6_fail;
1219
1220         err = rpl_init();
1221         if (err)
1222                 goto rpl_fail;
1223
1224         err = ioam6_init();
1225         if (err)
1226                 goto ioam6_fail;
1227
1228         err = igmp6_late_init();
1229         if (err)
1230                 goto igmp6_late_err;
1231
1232 #ifdef CONFIG_SYSCTL
1233         err = ipv6_sysctl_register();
1234         if (err)
1235                 goto sysctl_fail;
1236 #endif
1237
1238         /* ensure that ipv6 stubs are visible only after ipv6 is ready */
1239         wmb();
1240         ipv6_stub = &ipv6_stub_impl;
1241         ipv6_bpf_stub = &ipv6_bpf_stub_impl;
1242 out:
1243         return err;
1244
1245 #ifdef CONFIG_SYSCTL
1246 sysctl_fail:
1247         igmp6_late_cleanup();
1248 #endif
1249 igmp6_late_err:
1250         ioam6_exit();
1251 ioam6_fail:
1252         rpl_exit();
1253 rpl_fail:
1254         seg6_exit();
1255 seg6_fail:
1256         calipso_exit();
1257 calipso_fail:
1258         pingv6_exit();
1259 pingv6_fail:
1260         ipv6_packet_cleanup();
1261 ipv6_packet_fail:
1262         tcpv6_exit();
1263 tcpv6_fail:
1264         udpv6_offload_exit();
1265 udpv6_offload_fail:
1266         udplitev6_exit();
1267 udplitev6_fail:
1268         udpv6_exit();
1269 udpv6_fail:
1270         ipv6_frag_exit();
1271 ipv6_frag_fail:
1272         ipv6_exthdrs_exit();
1273 ipv6_exthdrs_fail:
1274         addrconf_cleanup();
1275 addrconf_fail:
1276         ipv6_anycast_cleanup();
1277 ipv6_anycast_fail:
1278         ip6_flowlabel_cleanup();
1279 ip6_flowlabel_fail:
1280         ndisc_late_cleanup();
1281 ndisc_late_fail:
1282         ip6_route_cleanup();
1283 ip6_route_fail:
1284 #ifdef CONFIG_PROC_FS
1285         if6_proc_exit();
1286 proc_if6_fail:
1287         ipv6_misc_proc_exit();
1288 proc_misc6_fail:
1289         udplite6_proc_exit();
1290 proc_udplite6_fail:
1291         raw6_proc_exit();
1292 proc_raw6_fail:
1293 #endif
1294         ipv6_netfilter_fini();
1295 netfilter_fail:
1296         igmp6_cleanup();
1297 igmp_fail:
1298         ndisc_cleanup();
1299 ndisc_fail:
1300         icmpv6_cleanup();
1301 icmp_fail:
1302         ip6_mr_cleanup();
1303 ipmr_fail:
1304         unregister_pernet_subsys(&inet6_net_ops);
1305 register_pernet_fail:
1306         sock_unregister(PF_INET6);
1307         rtnl_unregister_all(PF_INET6);
1308 out_sock_register_fail:
1309         rawv6_exit();
1310 out_unregister_ping_proto:
1311         proto_unregister(&pingv6_prot);
1312 out_unregister_raw_proto:
1313         proto_unregister(&rawv6_prot);
1314 out_unregister_udplite_proto:
1315         proto_unregister(&udplitev6_prot);
1316 out_unregister_udp_proto:
1317         proto_unregister(&udpv6_prot);
1318 out_unregister_tcp_proto:
1319         proto_unregister(&tcpv6_prot);
1320         goto out;
1321 }
1322 module_init(inet6_init);
1323
1324 MODULE_ALIAS_NETPROTO(PF_INET6);