net/ipv6/af_inet6.c

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