net/ipv6/af_inet6.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *      PF_INET6 socket protocol family
   4  *      Linux INET6 implementation
   5  *
   6  *      Authors:
   7  *      Pedro Roque             <roque@di.fc.ul.pt>
   8  *
   9  *      Adapted from linux/net/ipv4/af_inet.c
  10  *
  11  *      Fixes:
  12  *      piggy, Karl Knutson     :       Socket protocol table
  13  *      Hideaki YOSHIFUJI       :       sin6_scope_id support
  14  *      Arnaldo Melo            :       check proc_net_create return, cleanups
  15  */
  16
  17 #define pr_fmt(fmt) "IPv6: " fmt
  18
  19 #include <linux/module.h>
  20 #include <linux/capability.h>
  21 #include <linux/errno.h>
  22 #include <linux/types.h>
  23 #include <linux/socket.h>
  24 #include <linux/in.h>
  25 #include <linux/kernel.h>
  26 #include <linux/timer.h>
  27 #include <linux/string.h>
  28 #include <linux/sockios.h>
  29 #include <linux/net.h>
  30 #include <linux/fcntl.h>
  31 #include <linux/mm.h>
  32 #include <linux/interrupt.h>
  33 #include <linux/proc_fs.h>
  34 #include <linux/stat.h>
  35 #include <linux/init.h>
  36 #include <linux/slab.h>
  37
  38 #include <linux/inet.h>
  39 #include <linux/netdevice.h>
  40 #include <linux/icmpv6.h>
  41 #include <linux/netfilter_ipv6.h>
  42
  43 #include <net/ip.h>
  44 #include <net/ipv6.h>
  45 #include <net/udp.h>
  46 #include <net/udplite.h>
  47 #include <net/tcp.h>
  48 #include <net/ping.h>
  49 #include <net/protocol.h>
  50 #include <net/inet_common.h>
  51 #include <net/route.h>
  52 #include <net/transp_v6.h>
  53 #include <net/ip6_route.h>
  54 #include <net/addrconf.h>
  55 #include <net/ipv6_stubs.h>
  56 #include <net/ndisc.h>
  57 #ifdef CONFIG_IPV6_TUNNEL
  58 #include <net/ip6_tunnel.h>
  59 #endif
  60 #include <net/calipso.h>
  61 #include <net/seg6.h>
  62 #include <net/rpl.h>
  63 #include <net/compat.h>
  64 #include <net/xfrm.h>
  65 #include <net/ioam6.h>
  66 #include <net/rawv6.h>
  67
  68 #include <linux/uaccess.h>
  69 #include <linux/mroute6.h>
  70
  71 #include "ip6_offload.h"
  72
  73 MODULE_AUTHOR("Cast of dozens");
  74 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
  75 MODULE_LICENSE("GPL");
  76
  77 /* The inetsw6 table contains everything that inet6_create needs to
  78  * build a new socket.
  79  */
  80 static struct list_head inetsw6[SOCK_MAX];
  81 static DEFINE_SPINLOCK(inetsw6_lock);
  82
  83 struct ipv6_params ipv6_defaults = {
  84         .disable_ipv6 = 0,
  85         .autoconf = 1,
  86 };
  87
  88 static int disable_ipv6_mod;
  89
  90 module_param_named(disable, disable_ipv6_mod, int, 0444);
  91 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
  92
  93 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
  94 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
  95
  96 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
  97 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
  98
  99 bool ipv6_mod_enabled(void)
 100 {
 101         return disable_ipv6_mod == 0;
 102 }
 103 EXPORT_SYMBOL_GPL(ipv6_mod_enabled);
 104
 105 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
 106 {
 107         const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
 108
 109         return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
 110 }
 111
 112 void inet6_sock_destruct(struct sock *sk)
 113 {
 114         inet6_cleanup_sock(sk);
 115         inet_sock_destruct(sk);
 116 }
 117 EXPORT_SYMBOL_GPL(inet6_sock_destruct);
 118
 119 static int inet6_create(struct net *net, struct socket *sock, int protocol,
 120                         int kern)
 121 {
 122         struct inet_sock *inet;
 123         struct ipv6_pinfo *np;
 124         struct sock *sk;
 125         struct inet_protosw *answer;
 126         struct proto *answer_prot;
 127         unsigned char answer_flags;
 128         int try_loading_module = 0;
 129         int err;
 130
 131         if (protocol < 0 || protocol >= IPPROTO_MAX)
 132                 return -EINVAL;
 133
 134         /* Look for the requested type/protocol pair. */
 135 lookup_protocol:
 136         err = -ESOCKTNOSUPPORT;
 137         rcu_read_lock();
 138         list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
 139
 140                 err = 0;
 141                 /* Check the non-wild match. */
 142                 if (protocol == answer->protocol) {
 143                         if (protocol != IPPROTO_IP)
 144                                 break;
 145                 } else {
 146                         /* Check for the two wild cases. */
 147                         if (IPPROTO_IP == protocol) {
 148                                 protocol = answer->protocol;
 149                                 break;
 150                         }
 151                         if (IPPROTO_IP == answer->protocol)
 152                                 break;
 153                 }
 154                 err = -EPROTONOSUPPORT;
 155         }
 156
 157         if (err) {
 158                 if (try_loading_module < 2) {
 159                         rcu_read_unlock();
 160                         /*
 161                          * Be more specific, e.g. net-pf-10-proto-132-type-1
 162                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
 163                          */
 164                         if (++try_loading_module == 1)
 165                                 request_module("net-pf-%d-proto-%d-type-%d",
 166                                                 PF_INET6, protocol, sock->type);
 167                         /*
 168                          * Fall back to generic, e.g. net-pf-10-proto-132
 169                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
 170                          */
 171                         else
 172                                 request_module("net-pf-%d-proto-%d",
 173                                                 PF_INET6, protocol);
 174                         goto lookup_protocol;
 175                 } else
 176                         goto out_rcu_unlock;
 177         }
 178
 179         err = -EPERM;
 180         if (sock->type == SOCK_RAW && !kern &&
 181             !ns_capable(net->user_ns, CAP_NET_RAW))
 182                 goto out_rcu_unlock;
 183
 184         sock->ops = answer->ops;
 185         answer_prot = answer->prot;
 186         answer_flags = answer->flags;
 187         rcu_read_unlock();
 188
 189         WARN_ON(!answer_prot->slab);
 190
 191         err = -ENOBUFS;
 192         sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern);
 193         if (!sk)
 194                 goto out;
 195
 196         sock_init_data(sock, sk);
 197
 198         err = 0;
 199         if (INET_PROTOSW_REUSE & answer_flags)
 200                 sk->sk_reuse = SK_CAN_REUSE;
 201
 202         if (INET_PROTOSW_ICSK & answer_flags)
 203                 inet_init_csk_locks(sk);
 204
 205         inet = inet_sk(sk);
 206         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
 207
 208         if (SOCK_RAW == sock->type) {
 209                 inet->inet_num = protocol;
 210                 if (IPPROTO_RAW == protocol)
 211                         inet->hdrincl = 1;
 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         np->mc_loop     = 1;
 224         np->mc_all      = 1;
 225         np->pmtudisc    = IPV6_PMTUDISC_WANT;
 226         np->repflow     = net->ipv6.sysctl.flowlabel_reflect & FLOWLABEL_REFLECT_ESTABLISHED;
 227         sk->sk_ipv6only = net->ipv6.sysctl.bindv6only;
 228         sk->sk_txrehash = READ_ONCE(net->core.sysctl_txrehash);
 229
 230         /* Init the ipv4 part of the socket since we can have sockets
 231          * using v6 API for ipv4.
 232          */
 233         inet->uc_ttl    = -1;
 234
 235         inet->mc_loop   = 1;
 236         inet->mc_ttl    = 1;
 237         inet->mc_index  = 0;
 238         RCU_INIT_POINTER(inet->mc_list, NULL);
 239         inet->rcv_tos   = 0;
 240
 241         if (READ_ONCE(net->ipv4.sysctl_ip_no_pmtu_disc))
 242                 inet->pmtudisc = IP_PMTUDISC_DONT;
 243         else
 244                 inet->pmtudisc = IP_PMTUDISC_WANT;
 245         /*
 246          * Increment only the relevant sk_prot->socks debug field, this changes
 247          * the previous behaviour of incrementing both the equivalent to
 248          * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
 249          *
 250          * This allows better debug granularity as we'll know exactly how many
 251          * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
 252          * transport protocol socks. -acme
 253          */
 254         sk_refcnt_debug_inc(sk);
 255
 256         if (inet->inet_num) {
 257                 /* It assumes that any protocol which allows
 258                  * the user to assign a number at socket
 259                  * creation time automatically shares.
 260                  */
 261                 inet->inet_sport = htons(inet->inet_num);
 262                 err = sk->sk_prot->hash(sk);
 263                 if (err) {
 264                         sk_common_release(sk);
 265                         goto out;
 266                 }
 267         }
 268         if (sk->sk_prot->init) {
 269                 err = sk->sk_prot->init(sk);
 270                 if (err) {
 271                         sk_common_release(sk);
 272                         goto out;
 273                 }
 274         }
 275
 276         if (!kern) {
 277                 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
 278                 if (err) {
 279                         sk_common_release(sk);
 280                         goto out;
 281                 }
 282         }
 283 out:
 284         return err;
 285 out_rcu_unlock:
 286         rcu_read_unlock();
 287         goto out;
 288 }
 289
 290 static int __inet6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
 291                         u32 flags)
 292 {
 293         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
 294         struct inet_sock *inet = inet_sk(sk);
 295         struct ipv6_pinfo *np = inet6_sk(sk);
 296         struct net *net = sock_net(sk);
 297         __be32 v4addr = 0;
 298         unsigned short snum;
 299         bool saved_ipv6only;
 300         int addr_type = 0;
 301         int err = 0;
 302
 303         if (addr->sin6_family != AF_INET6)
 304                 return -EAFNOSUPPORT;
 305
 306         addr_type = ipv6_addr_type(&addr->sin6_addr);
 307         if ((addr_type & IPV6_ADDR_MULTICAST) && sk->sk_type == SOCK_STREAM)
 308                 return -EINVAL;
 309
 310         snum = ntohs(addr->sin6_port);
 311         if (!(flags & BIND_NO_CAP_NET_BIND_SERVICE) &&
 312             snum && inet_port_requires_bind_service(net, snum) &&
 313             !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
 314                 return -EACCES;
 315
 316         if (flags & BIND_WITH_LOCK)
 317                 lock_sock(sk);
 318
 319         /* Check these errors (active socket, double bind). */
 320         if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
 321                 err = -EINVAL;
 322                 goto out;
 323         }
 324
 325         /* Check if the address belongs to the host. */
 326         if (addr_type == IPV6_ADDR_MAPPED) {
 327                 struct net_device *dev = NULL;
 328                 int chk_addr_ret;
 329
 330                 /* Binding to v4-mapped address on a v6-only socket
 331                  * makes no sense
 332                  */
 333                 if (ipv6_only_sock(sk)) {
 334                         err = -EINVAL;
 335                         goto out;
 336                 }
 337
 338                 rcu_read_lock();
 339                 if (sk->sk_bound_dev_if) {
 340                         dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
 341                         if (!dev) {
 342                                 err = -ENODEV;
 343                                 goto out_unlock;
 344                         }
 345                 }
 346
 347                 /* Reproduce AF_INET checks to make the bindings consistent */
 348                 v4addr = addr->sin6_addr.s6_addr32[3];
 349                 chk_addr_ret = inet_addr_type_dev_table(net, dev, v4addr);
 350                 rcu_read_unlock();
 351
 352                 if (!inet_addr_valid_or_nonlocal(net, inet, v4addr,
 353                                                  chk_addr_ret)) {
 354                         err = -EADDRNOTAVAIL;
 355                         goto out;
 356                 }
 357         } else {
 358                 if (addr_type != IPV6_ADDR_ANY) {
 359                         struct net_device *dev = NULL;
 360
 361                         rcu_read_lock();
 362                         if (__ipv6_addr_needs_scope_id(addr_type)) {
 363                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 364                                     addr->sin6_scope_id) {
 365                                         /* Override any existing binding, if another one
 366                                          * is supplied by user.
 367                                          */
 368                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
 369                                 }
 370
 371                                 /* Binding to link-local address requires an interface */
 372                                 if (!sk->sk_bound_dev_if) {
 373                                         err = -EINVAL;
 374                                         goto out_unlock;
 375                                 }
 376                         }
 377
 378                         if (sk->sk_bound_dev_if) {
 379                                 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
 380                                 if (!dev) {
 381                                         err = -ENODEV;
 382                                         goto out_unlock;
 383                                 }
 384                         }
 385
 386                         /* ipv4 addr of the socket is invalid.  Only the
 387                          * unspecified and mapped address have a v4 equivalent.
 388                          */
 389                         v4addr = LOOPBACK4_IPV6;
 390                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
 391                                 if (!ipv6_can_nonlocal_bind(net, inet) &&
 392                                     !ipv6_chk_addr(net, &addr->sin6_addr,
 393                                                    dev, 0)) {
 394                                         err = -EADDRNOTAVAIL;
 395                                         goto out_unlock;
 396                                 }
 397                         }
 398                         rcu_read_unlock();
 399                 }
 400         }
 401
 402         inet->inet_rcv_saddr = v4addr;
 403         inet->inet_saddr = v4addr;
 404
 405         sk->sk_v6_rcv_saddr = addr->sin6_addr;
 406
 407         if (!(addr_type & IPV6_ADDR_MULTICAST))
 408                 np->saddr = addr->sin6_addr;
 409
 410         saved_ipv6only = sk->sk_ipv6only;
 411         if (addr_type != IPV6_ADDR_ANY && addr_type != IPV6_ADDR_MAPPED)
 412                 sk->sk_ipv6only = 1;
 413
 414         /* Make sure we are allowed to bind here. */
 415         if (snum || !(inet->bind_address_no_port ||
 416                       (flags & BIND_FORCE_ADDRESS_NO_PORT))) {
 417                 err = sk->sk_prot->get_port(sk, snum);
 418                 if (err) {
 419                         sk->sk_ipv6only = saved_ipv6only;
 420                         inet_reset_saddr(sk);
 421                         goto out;
 422                 }
 423                 if (!(flags & BIND_FROM_BPF)) {
 424                         err = BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk);
 425                         if (err) {
 426                                 sk->sk_ipv6only = saved_ipv6only;
 427                                 inet_reset_saddr(sk);
 428                                 if (sk->sk_prot->put_port)
 429                                         sk->sk_prot->put_port(sk);
 430                                 goto out;
 431                         }
 432                 }
 433         }
 434
 435         if (addr_type != IPV6_ADDR_ANY)
 436                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
 437         if (snum)
 438                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
 439         inet->inet_sport = htons(inet->inet_num);
 440         inet->inet_dport = 0;
 441         inet->inet_daddr = 0;
 442 out:
 443         if (flags & BIND_WITH_LOCK)
 444                 release_sock(sk);
 445         return err;
 446 out_unlock:
 447         rcu_read_unlock();
 448         goto out;
 449 }
 450
 451 /* bind for INET6 API */
 452 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 453 {
 454         struct sock *sk = sock->sk;
 455         u32 flags = BIND_WITH_LOCK;
 456         const struct proto *prot;
 457         int err = 0;
 458
 459         /* IPV6_ADDRFORM can change sk->sk_prot under us. */
 460         prot = READ_ONCE(sk->sk_prot);
 461         /* If the socket has its own bind function then use it. */
 462         if (prot->bind)
 463                 return prot->bind(sk, uaddr, addr_len);
 464
 465         if (addr_len < SIN6_LEN_RFC2133)
 466                 return -EINVAL;
 467
 468         /* BPF prog is run before any checks are done so that if the prog
 469          * changes context in a wrong way it will be caught.
 470          */
 471         err = BPF_CGROUP_RUN_PROG_INET_BIND_LOCK(sk, uaddr,
 472                                                  CGROUP_INET6_BIND, &flags);
 473         if (err)
 474                 return err;
 475
 476         return __inet6_bind(sk, uaddr, addr_len, flags);
 477 }
 478 EXPORT_SYMBOL(inet6_bind);
 479
 480 int inet6_release(struct socket *sock)
 481 {
 482         struct sock *sk = sock->sk;
 483
 484         if (!sk)
 485                 return -EINVAL;
 486
 487         /* Free mc lists */
 488         ipv6_sock_mc_close(sk);
 489
 490         /* Free ac lists */
 491         ipv6_sock_ac_close(sk);
 492
 493         return inet_release(sock);
 494 }
 495 EXPORT_SYMBOL(inet6_release);
 496
 497 void inet6_destroy_sock(struct sock *sk)
 498 {
 499         struct ipv6_pinfo *np = inet6_sk(sk);
 500         struct sk_buff *skb;
 501         struct ipv6_txoptions *opt;
 502
 503         /* Release rx options */
 504
 505         skb = xchg(&np->pktoptions, NULL);
 506         kfree_skb(skb);
 507
 508         skb = xchg(&np->rxpmtu, NULL);
 509         kfree_skb(skb);
 510
 511         /* Free flowlabels */
 512         fl6_free_socklist(sk);
 513
 514         /* Free tx options */
 515
 516         opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL);
 517         if (opt) {
 518                 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 519                 txopt_put(opt);
 520         }
 521 }
 522 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
 523
 524 void inet6_cleanup_sock(struct sock *sk)
 525 {
 526         inet6_destroy_sock(sk);
 527 }
 528 EXPORT_SYMBOL_GPL(inet6_cleanup_sock);
 529
 530 /*
 531  *      This does both peername and sockname.
 532  */
 533 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 534                   int peer)
 535 {
 536         struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
 537         struct sock *sk = sock->sk;
 538         struct inet_sock *inet = inet_sk(sk);
 539         struct ipv6_pinfo *np = inet6_sk(sk);
 540
 541         sin->sin6_family = AF_INET6;
 542         sin->sin6_flowinfo = 0;
 543         sin->sin6_scope_id = 0;
 544         lock_sock(sk);
 545         if (peer) {
 546                 if (!inet->inet_dport ||
 547                     (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
 548                     peer == 1)) {
 549                         release_sock(sk);
 550                         return -ENOTCONN;
 551                 }
 552                 sin->sin6_port = inet->inet_dport;
 553                 sin->sin6_addr = sk->sk_v6_daddr;
 554                 if (np->sndflow)
 555                         sin->sin6_flowinfo = np->flow_label;
 556                 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin,
 557                                        CGROUP_INET6_GETPEERNAME);
 558         } else {
 559                 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
 560                         sin->sin6_addr = np->saddr;
 561                 else
 562                         sin->sin6_addr = sk->sk_v6_rcv_saddr;
 563                 sin->sin6_port = inet->inet_sport;
 564                 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin,
 565                                        CGROUP_INET6_GETSOCKNAME);
 566         }
 567         sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
 568                                                  sk->sk_bound_dev_if);
 569         release_sock(sk);
 570         return sizeof(*sin);
 571 }
 572 EXPORT_SYMBOL(inet6_getname);
 573
 574 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 575 {
 576         void __user *argp = (void __user *)arg;
 577         struct sock *sk = sock->sk;
 578         struct net *net = sock_net(sk);
 579         const struct proto *prot;
 580
 581         switch (cmd) {
 582         case SIOCADDRT:
 583         case SIOCDELRT: {
 584                 struct in6_rtmsg rtmsg;
 585
 586                 if (copy_from_user(&rtmsg, argp, sizeof(rtmsg)))
 587                         return -EFAULT;
 588                 return ipv6_route_ioctl(net, cmd, &rtmsg);
 589         }
 590         case SIOCSIFADDR:
 591                 return addrconf_add_ifaddr(net, argp);
 592         case SIOCDIFADDR:
 593                 return addrconf_del_ifaddr(net, argp);
 594         case SIOCSIFDSTADDR:
 595                 return addrconf_set_dstaddr(net, argp);
 596         default:
 597                 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
 598                 prot = READ_ONCE(sk->sk_prot);
 599                 if (!prot->ioctl)
 600                         return -ENOIOCTLCMD;
 601                 return prot->ioctl(sk, cmd, arg);
 602         }
 603         /*NOTREACHED*/
 604         return 0;
 605 }
 606 EXPORT_SYMBOL(inet6_ioctl);
 607
 608 #ifdef CONFIG_COMPAT
 609 struct compat_in6_rtmsg {
 610         struct in6_addr         rtmsg_dst;
 611         struct in6_addr         rtmsg_src;
 612         struct in6_addr         rtmsg_gateway;
 613         u32                     rtmsg_type;
 614         u16                     rtmsg_dst_len;
 615         u16                     rtmsg_src_len;
 616         u32                     rtmsg_metric;
 617         u32                     rtmsg_info;
 618         u32                     rtmsg_flags;
 619         s32                     rtmsg_ifindex;
 620 };
 621
 622 static int inet6_compat_routing_ioctl(struct sock *sk, unsigned int cmd,
 623                 struct compat_in6_rtmsg __user *ur)
 624 {
 625         struct in6_rtmsg rt;
 626
 627         if (copy_from_user(&rt.rtmsg_dst, &ur->rtmsg_dst,
 628                         3 * sizeof(struct in6_addr)) ||
 629             get_user(rt.rtmsg_type, &ur->rtmsg_type) ||
 630             get_user(rt.rtmsg_dst_len, &ur->rtmsg_dst_len) ||
 631             get_user(rt.rtmsg_src_len, &ur->rtmsg_src_len) ||
 632             get_user(rt.rtmsg_metric, &ur->rtmsg_metric) ||
 633             get_user(rt.rtmsg_info, &ur->rtmsg_info) ||
 634             get_user(rt.rtmsg_flags, &ur->rtmsg_flags) ||
 635             get_user(rt.rtmsg_ifindex, &ur->rtmsg_ifindex))
 636                 return -EFAULT;
 637
 638
 639         return ipv6_route_ioctl(sock_net(sk), cmd, &rt);
 640 }
 641
 642 int inet6_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 643 {
 644         void __user *argp = compat_ptr(arg);
 645         struct sock *sk = sock->sk;
 646
 647         switch (cmd) {
 648         case SIOCADDRT:
 649         case SIOCDELRT:
 650                 return inet6_compat_routing_ioctl(sk, cmd, argp);
 651         default:
 652                 return -ENOIOCTLCMD;
 653         }
 654 }
 655 EXPORT_SYMBOL_GPL(inet6_compat_ioctl);
 656 #endif /* CONFIG_COMPAT */
 657
 658 INDIRECT_CALLABLE_DECLARE(int udpv6_sendmsg(struct sock *, struct msghdr *,
 659                                             size_t));
 660 int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
 661 {
 662         struct sock *sk = sock->sk;
 663         const struct proto *prot;
 664
 665         if (unlikely(inet_send_prepare(sk)))
 666                 return -EAGAIN;
 667
 668         /* IPV6_ADDRFORM can change sk->sk_prot under us. */
 669         prot = READ_ONCE(sk->sk_prot);
 670         return INDIRECT_CALL_2(prot->sendmsg, tcp_sendmsg, udpv6_sendmsg,
 671                                sk, msg, size);
 672 }
 673
 674 INDIRECT_CALLABLE_DECLARE(int udpv6_recvmsg(struct sock *, struct msghdr *,
 675                                             size_t, int, int *));
 676 int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
 677                   int flags)
 678 {
 679         struct sock *sk = sock->sk;
 680         const struct proto *prot;
 681         int addr_len = 0;
 682         int err;
 683
 684         if (likely(!(flags & MSG_ERRQUEUE)))
 685                 sock_rps_record_flow(sk);
 686
 687         /* IPV6_ADDRFORM can change sk->sk_prot under us. */
 688         prot = READ_ONCE(sk->sk_prot);
 689         err = INDIRECT_CALL_2(prot->recvmsg, tcp_recvmsg, udpv6_recvmsg,
 690                               sk, msg, size, flags, &addr_len);
 691         if (err >= 0)
 692                 msg->msg_namelen = addr_len;
 693         return err;
 694 }
 695
 696 const struct proto_ops inet6_stream_ops = {
 697         .family            = PF_INET6,
 698         .owner             = THIS_MODULE,
 699         .release           = inet6_release,
 700         .bind              = inet6_bind,
 701         .connect           = inet_stream_connect,       /* ok           */
 702         .socketpair        = sock_no_socketpair,        /* a do nothing */
 703         .accept            = inet_accept,               /* ok           */
 704         .getname           = inet6_getname,
 705         .poll              = tcp_poll,                  /* ok           */
 706         .ioctl             = inet6_ioctl,               /* must change  */
 707         .gettstamp         = sock_gettstamp,
 708         .listen            = inet_listen,               /* ok           */
 709         .shutdown          = inet_shutdown,             /* ok           */
 710         .setsockopt        = sock_common_setsockopt,    /* ok           */
 711         .getsockopt        = sock_common_getsockopt,    /* ok           */
 712         .sendmsg           = inet6_sendmsg,             /* retpoline's sake */
 713         .recvmsg           = inet6_recvmsg,             /* retpoline's sake */
 714 #ifdef CONFIG_MMU
 715         .mmap              = tcp_mmap,
 716 #endif
 717         .splice_eof        = inet_splice_eof,
 718         .sendpage          = inet_sendpage,
 719         .sendmsg_locked    = tcp_sendmsg_locked,
 720         .sendpage_locked   = tcp_sendpage_locked,
 721         .splice_read       = tcp_splice_read,
 722         .read_sock         = tcp_read_sock,
 723         .read_skb          = tcp_read_skb,
 724         .peek_len          = tcp_peek_len,
 725 #ifdef CONFIG_COMPAT
 726         .compat_ioctl      = inet6_compat_ioctl,
 727 #endif
 728         .set_rcvlowat      = tcp_set_rcvlowat,
 729 };
 730
 731 const struct proto_ops inet6_dgram_ops = {
 732         .family            = PF_INET6,
 733         .owner             = THIS_MODULE,
 734         .release           = inet6_release,
 735         .bind              = inet6_bind,
 736         .connect           = inet_dgram_connect,        /* ok           */
 737         .socketpair        = sock_no_socketpair,        /* a do nothing */
 738         .accept            = sock_no_accept,            /* a do nothing */
 739         .getname           = inet6_getname,
 740         .poll              = udp_poll,                  /* ok           */
 741         .ioctl             = inet6_ioctl,               /* must change  */
 742         .gettstamp         = sock_gettstamp,
 743         .listen            = sock_no_listen,            /* ok           */
 744         .shutdown          = inet_shutdown,             /* ok           */
 745         .setsockopt        = sock_common_setsockopt,    /* ok           */
 746         .getsockopt        = sock_common_getsockopt,    /* ok           */
 747         .sendmsg           = inet6_sendmsg,             /* retpoline's sake */
 748         .recvmsg           = inet6_recvmsg,             /* retpoline's sake */
 749         .read_skb          = udp_read_skb,
 750         .mmap              = sock_no_mmap,
 751         .sendpage          = sock_no_sendpage,
 752         .set_peek_off      = sk_set_peek_off,
 753 #ifdef CONFIG_COMPAT
 754         .compat_ioctl      = inet6_compat_ioctl,
 755 #endif
 756 };
 757
 758 static const struct net_proto_family inet6_family_ops = {
 759         .family = PF_INET6,
 760         .create = inet6_create,
 761         .owner  = THIS_MODULE,
 762 };
 763
 764 int inet6_register_protosw(struct inet_protosw *p)
 765 {
 766         struct list_head *lh;
 767         struct inet_protosw *answer;
 768         struct list_head *last_perm;
 769         int protocol = p->protocol;
 770         int ret;
 771
 772         spin_lock_bh(&inetsw6_lock);
 773
 774         ret = -EINVAL;
 775         if (p->type >= SOCK_MAX)
 776                 goto out_illegal;
 777
 778         /* If we are trying to override a permanent protocol, bail. */
 779         answer = NULL;
 780         ret = -EPERM;
 781         last_perm = &inetsw6[p->type];
 782         list_for_each(lh, &inetsw6[p->type]) {
 783                 answer = list_entry(lh, struct inet_protosw, list);
 784
 785                 /* Check only the non-wild match. */
 786                 if (INET_PROTOSW_PERMANENT & answer->flags) {
 787                         if (protocol == answer->protocol)
 788                                 break;
 789                         last_perm = lh;
 790                 }
 791
 792                 answer = NULL;
 793         }
 794         if (answer)
 795                 goto out_permanent;
 796
 797         /* Add the new entry after the last permanent entry if any, so that
 798          * the new entry does not override a permanent entry when matched with
 799          * a wild-card protocol. But it is allowed to override any existing
 800          * non-permanent entry.  This means that when we remove this entry, the
 801          * system automatically returns to the old behavior.
 802          */
 803         list_add_rcu(&p->list, last_perm);
 804         ret = 0;
 805 out:
 806         spin_unlock_bh(&inetsw6_lock);
 807         return ret;
 808
 809 out_permanent:
 810         pr_err("Attempt to override permanent protocol %d\n", protocol);
 811         goto out;
 812
 813 out_illegal:
 814         pr_err("Ignoring attempt to register invalid socket type %d\n",
 815                p->type);
 816         goto out;
 817 }
 818 EXPORT_SYMBOL(inet6_register_protosw);
 819
 820 void
 821 inet6_unregister_protosw(struct inet_protosw *p)
 822 {
 823         if (INET_PROTOSW_PERMANENT & p->flags) {
 824                 pr_err("Attempt to unregister permanent protocol %d\n",
 825                        p->protocol);
 826         } else {
 827                 spin_lock_bh(&inetsw6_lock);
 828                 list_del_rcu(&p->list);
 829                 spin_unlock_bh(&inetsw6_lock);
 830
 831                 synchronize_net();
 832         }
 833 }
 834 EXPORT_SYMBOL(inet6_unregister_protosw);
 835
 836 int inet6_sk_rebuild_header(struct sock *sk)
 837 {
 838         struct ipv6_pinfo *np = inet6_sk(sk);
 839         struct dst_entry *dst;
 840
 841         dst = __sk_dst_check(sk, np->dst_cookie);
 842
 843         if (!dst) {
 844                 struct inet_sock *inet = inet_sk(sk);
 845                 struct in6_addr *final_p, final;
 846                 struct flowi6 fl6;
 847
 848                 memset(&fl6, 0, sizeof(fl6));
 849                 fl6.flowi6_proto = sk->sk_protocol;
 850                 fl6.daddr = sk->sk_v6_daddr;
 851                 fl6.saddr = np->saddr;
 852                 fl6.flowlabel = np->flow_label;
 853                 fl6.flowi6_oif = sk->sk_bound_dev_if;
 854                 fl6.flowi6_mark = sk->sk_mark;
 855                 fl6.fl6_dport = inet->inet_dport;
 856                 fl6.fl6_sport = inet->inet_sport;
 857                 fl6.flowi6_uid = sk->sk_uid;
 858                 security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6));
 859
 860                 rcu_read_lock();
 861                 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt),
 862                                          &final);
 863                 rcu_read_unlock();
 864
 865                 dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
 866                 if (IS_ERR(dst)) {
 867                         sk->sk_route_caps = 0;
 868                         sk->sk_err_soft = -PTR_ERR(dst);
 869                         return PTR_ERR(dst);
 870                 }
 871
 872                 ip6_dst_store(sk, dst, NULL, NULL);
 873         }
 874
 875         return 0;
 876 }
 877 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
 878
 879 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
 880                        const struct inet6_skb_parm *opt)
 881 {
 882         const struct ipv6_pinfo *np = inet6_sk(sk);
 883
 884         if (np->rxopt.all) {
 885                 if (((opt->flags & IP6SKB_HOPBYHOP) &&
 886                      (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) ||
 887                     (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) &&
 888                      np->rxopt.bits.rxflow) ||
 889                     (opt->srcrt && (np->rxopt.bits.srcrt ||
 890                      np->rxopt.bits.osrcrt)) ||
 891                     ((opt->dst1 || opt->dst0) &&
 892                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
 893                         return true;
 894         }
 895         return false;
 896 }
 897 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
 898
 899 static struct packet_type ipv6_packet_type __read_mostly = {
 900         .type = cpu_to_be16(ETH_P_IPV6),
 901         .func = ipv6_rcv,
 902         .list_func = ipv6_list_rcv,
 903 };
 904
 905 static int __init ipv6_packet_init(void)
 906 {
 907         dev_add_pack(&ipv6_packet_type);
 908         return 0;
 909 }
 910
 911 static void ipv6_packet_cleanup(void)
 912 {
 913         dev_remove_pack(&ipv6_packet_type);
 914 }
 915
 916 static int __net_init ipv6_init_mibs(struct net *net)
 917 {
 918         int i;
 919
 920         net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib);
 921         if (!net->mib.udp_stats_in6)
 922                 return -ENOMEM;
 923         net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib);
 924         if (!net->mib.udplite_stats_in6)
 925                 goto err_udplite_mib;
 926         net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib);
 927         if (!net->mib.ipv6_statistics)
 928                 goto err_ip_mib;
 929
 930         for_each_possible_cpu(i) {
 931                 struct ipstats_mib *af_inet6_stats;
 932                 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i);
 933                 u64_stats_init(&af_inet6_stats->syncp);
 934         }
 935
 936
 937         net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib);
 938         if (!net->mib.icmpv6_statistics)
 939                 goto err_icmp_mib;
 940         net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
 941                                                 GFP_KERNEL);
 942         if (!net->mib.icmpv6msg_statistics)
 943                 goto err_icmpmsg_mib;
 944         return 0;
 945
 946 err_icmpmsg_mib:
 947         free_percpu(net->mib.icmpv6_statistics);
 948 err_icmp_mib:
 949         free_percpu(net->mib.ipv6_statistics);
 950 err_ip_mib:
 951         free_percpu(net->mib.udplite_stats_in6);
 952 err_udplite_mib:
 953         free_percpu(net->mib.udp_stats_in6);
 954         return -ENOMEM;
 955 }
 956
 957 static void ipv6_cleanup_mibs(struct net *net)
 958 {
 959         free_percpu(net->mib.udp_stats_in6);
 960         free_percpu(net->mib.udplite_stats_in6);
 961         free_percpu(net->mib.ipv6_statistics);
 962         free_percpu(net->mib.icmpv6_statistics);
 963         kfree(net->mib.icmpv6msg_statistics);
 964 }
 965
 966 static int __net_init inet6_net_init(struct net *net)
 967 {
 968         int err = 0;
 969
 970         net->ipv6.sysctl.bindv6only = 0;
 971         net->ipv6.sysctl.icmpv6_time = 1*HZ;
 972         net->ipv6.sysctl.icmpv6_echo_ignore_all = 0;
 973         net->ipv6.sysctl.icmpv6_echo_ignore_multicast = 0;
 974         net->ipv6.sysctl.icmpv6_echo_ignore_anycast = 0;
 975
 976         /* By default, rate limit error messages.
 977          * Except for pmtu discovery, it would break it.
 978          * proc_do_large_bitmap needs pointer to the bitmap.
 979          */
 980         bitmap_set(net->ipv6.sysctl.icmpv6_ratemask, 0, ICMPV6_ERRMSG_MAX + 1);
 981         bitmap_clear(net->ipv6.sysctl.icmpv6_ratemask, ICMPV6_PKT_TOOBIG, 1);
 982         net->ipv6.sysctl.icmpv6_ratemask_ptr = net->ipv6.sysctl.icmpv6_ratemask;
 983
 984         net->ipv6.sysctl.flowlabel_consistency = 1;
 985         net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS;
 986         net->ipv6.sysctl.idgen_retries = 3;
 987         net->ipv6.sysctl.idgen_delay = 1 * HZ;
 988         net->ipv6.sysctl.flowlabel_state_ranges = 0;
 989         net->ipv6.sysctl.max_dst_opts_cnt = IP6_DEFAULT_MAX_DST_OPTS_CNT;
 990         net->ipv6.sysctl.max_hbh_opts_cnt = IP6_DEFAULT_MAX_HBH_OPTS_CNT;
 991         net->ipv6.sysctl.max_dst_opts_len = IP6_DEFAULT_MAX_DST_OPTS_LEN;
 992         net->ipv6.sysctl.max_hbh_opts_len = IP6_DEFAULT_MAX_HBH_OPTS_LEN;
 993         net->ipv6.sysctl.fib_notify_on_flag_change = 0;
 994         atomic_set(&net->ipv6.fib6_sernum, 1);
 995
 996         net->ipv6.sysctl.ioam6_id = IOAM6_DEFAULT_ID;
 997         net->ipv6.sysctl.ioam6_id_wide = IOAM6_DEFAULT_ID_WIDE;
 998
 999         err = ipv6_init_mibs(net);
1000         if (err)
1001                 return err;
1002 #ifdef CONFIG_PROC_FS
1003         err = udp6_proc_init(net);
1004         if (err)
1005                 goto out;
1006         err = tcp6_proc_init(net);
1007         if (err)
1008                 goto proc_tcp6_fail;
1009         err = ac6_proc_init(net);
1010         if (err)
1011                 goto proc_ac6_fail;
1012 #endif
1013         return err;
1014
1015 #ifdef CONFIG_PROC_FS
1016 proc_ac6_fail:
1017         tcp6_proc_exit(net);
1018 proc_tcp6_fail:
1019         udp6_proc_exit(net);
1020 out:
1021         ipv6_cleanup_mibs(net);
1022         return err;
1023 #endif
1024 }
1025
1026 static void __net_exit inet6_net_exit(struct net *net)
1027 {
1028 #ifdef CONFIG_PROC_FS
1029         udp6_proc_exit(net);
1030         tcp6_proc_exit(net);
1031         ac6_proc_exit(net);
1032 #endif
1033         ipv6_cleanup_mibs(net);
1034 }
1035
1036 static struct pernet_operations inet6_net_ops = {
1037         .init = inet6_net_init,
1038         .exit = inet6_net_exit,
1039 };
1040
1041 static int ipv6_route_input(struct sk_buff *skb)
1042 {
1043         ip6_route_input(skb);
1044         return skb_dst(skb)->error;
1045 }
1046
1047 static const struct ipv6_stub ipv6_stub_impl = {
1048         .ipv6_sock_mc_join = ipv6_sock_mc_join,
1049         .ipv6_sock_mc_drop = ipv6_sock_mc_drop,
1050         .ipv6_dst_lookup_flow = ip6_dst_lookup_flow,
1051         .ipv6_route_input  = ipv6_route_input,
1052         .fib6_get_table    = fib6_get_table,
1053         .fib6_table_lookup = fib6_table_lookup,
1054         .fib6_lookup       = fib6_lookup,
1055         .fib6_select_path  = fib6_select_path,
1056         .ip6_mtu_from_fib6 = ip6_mtu_from_fib6,
1057         .fib6_nh_init      = fib6_nh_init,
1058         .fib6_nh_release   = fib6_nh_release,
1059         .fib6_nh_release_dsts = fib6_nh_release_dsts,
1060         .fib6_update_sernum = fib6_update_sernum_stub,
1061         .fib6_rt_update    = fib6_rt_update,
1062         .ip6_del_rt        = ip6_del_rt,
1063         .udpv6_encap_enable = udpv6_encap_enable,
1064         .ndisc_send_na = ndisc_send_na,
1065 #if IS_ENABLED(CONFIG_XFRM)
1066         .xfrm6_local_rxpmtu = xfrm6_local_rxpmtu,
1067         .xfrm6_udp_encap_rcv = xfrm6_udp_encap_rcv,
1068         .xfrm6_rcv_encap = xfrm6_rcv_encap,
1069 #endif
1070         .nd_tbl = &nd_tbl,
1071         .ipv6_fragment = ip6_fragment,
1072         .ipv6_dev_find = ipv6_dev_find,
1073 };
1074
1075 static const struct ipv6_bpf_stub ipv6_bpf_stub_impl = {
1076         .inet6_bind = __inet6_bind,
1077         .udp6_lib_lookup = __udp6_lib_lookup,
1078         .ipv6_setsockopt = do_ipv6_setsockopt,
1079         .ipv6_getsockopt = do_ipv6_getsockopt,
1080         .ipv6_dev_get_saddr = ipv6_dev_get_saddr,
1081 };
1082
1083 static int __init inet6_init(void)
1084 {
1085         struct list_head *r;
1086         int err = 0;
1087
1088         sock_skb_cb_check_size(sizeof(struct inet6_skb_parm));
1089
1090         /* Register the socket-side information for inet6_create.  */
1091         for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
1092                 INIT_LIST_HEAD(r);
1093
1094         raw_hashinfo_init(&raw_v6_hashinfo);
1095
1096         if (disable_ipv6_mod) {
1097                 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
1098                 goto out;
1099         }
1100
1101         err = proto_register(&tcpv6_prot, 1);
1102         if (err)
1103                 goto out;
1104
1105         err = proto_register(&udpv6_prot, 1);
1106         if (err)
1107                 goto out_unregister_tcp_proto;
1108
1109         err = proto_register(&udplitev6_prot, 1);
1110         if (err)
1111                 goto out_unregister_udp_proto;
1112
1113         err = proto_register(&rawv6_prot, 1);
1114         if (err)
1115                 goto out_unregister_udplite_proto;
1116
1117         err = proto_register(&pingv6_prot, 1);
1118         if (err)
1119                 goto out_unregister_raw_proto;
1120
1121         /* We MUST register RAW sockets before we create the ICMP6,
1122          * IGMP6, or NDISC control sockets.
1123          */
1124         err = rawv6_init();
1125         if (err)
1126                 goto out_unregister_ping_proto;
1127
1128         /* Register the family here so that the init calls below will
1129          * be able to create sockets. (?? is this dangerous ??)
1130          */
1131         err = sock_register(&inet6_family_ops);
1132         if (err)
1133                 goto out_sock_register_fail;
1134
1135         /*
1136          *      ipngwg API draft makes clear that the correct semantics
1137          *      for TCP and UDP is to consider one TCP and UDP instance
1138          *      in a host available by both INET and INET6 APIs and
1139          *      able to communicate via both network protocols.
1140          */
1141
1142         err = register_pernet_subsys(&inet6_net_ops);
1143         if (err)
1144                 goto register_pernet_fail;
1145         err = ip6_mr_init();
1146         if (err)
1147                 goto ipmr_fail;
1148         err = icmpv6_init();
1149         if (err)
1150                 goto icmp_fail;
1151         err = ndisc_init();
1152         if (err)
1153                 goto ndisc_fail;
1154         err = igmp6_init();
1155         if (err)
1156                 goto igmp_fail;
1157
1158         err = ipv6_netfilter_init();
1159         if (err)
1160                 goto netfilter_fail;
1161         /* Create /proc/foo6 entries. */
1162 #ifdef CONFIG_PROC_FS
1163         err = -ENOMEM;
1164         if (raw6_proc_init())
1165                 goto proc_raw6_fail;
1166         if (udplite6_proc_init())
1167                 goto proc_udplite6_fail;
1168         if (ipv6_misc_proc_init())
1169                 goto proc_misc6_fail;
1170         if (if6_proc_init())
1171                 goto proc_if6_fail;
1172 #endif
1173         err = ip6_route_init();
1174         if (err)
1175                 goto ip6_route_fail;
1176         err = ndisc_late_init();
1177         if (err)
1178                 goto ndisc_late_fail;
1179         err = ip6_flowlabel_init();
1180         if (err)
1181                 goto ip6_flowlabel_fail;
1182         err = ipv6_anycast_init();
1183         if (err)
1184                 goto ipv6_anycast_fail;
1185         err = addrconf_init();
1186         if (err)
1187                 goto addrconf_fail;
1188
1189         /* Init v6 extension headers. */
1190         err = ipv6_exthdrs_init();
1191         if (err)
1192                 goto ipv6_exthdrs_fail;
1193
1194         err = ipv6_frag_init();
1195         if (err)
1196                 goto ipv6_frag_fail;
1197
1198         /* Init v6 transport protocols. */
1199         err = udpv6_init();
1200         if (err)
1201                 goto udpv6_fail;
1202
1203         err = udplitev6_init();
1204         if (err)
1205                 goto udplitev6_fail;
1206
1207         err = udpv6_offload_init();
1208         if (err)
1209                 goto udpv6_offload_fail;
1210
1211         err = tcpv6_init();
1212         if (err)
1213                 goto tcpv6_fail;
1214
1215         err = ipv6_packet_init();
1216         if (err)
1217                 goto ipv6_packet_fail;
1218
1219         err = pingv6_init();
1220         if (err)
1221                 goto pingv6_fail;
1222
1223         err = calipso_init();
1224         if (err)
1225                 goto calipso_fail;
1226
1227         err = seg6_init();
1228         if (err)
1229                 goto seg6_fail;
1230
1231         err = rpl_init();
1232         if (err)
1233                 goto rpl_fail;
1234
1235         err = ioam6_init();
1236         if (err)
1237                 goto ioam6_fail;
1238
1239         err = igmp6_late_init();
1240         if (err)
1241                 goto igmp6_late_err;
1242
1243 #ifdef CONFIG_SYSCTL
1244         err = ipv6_sysctl_register();
1245         if (err)
1246                 goto sysctl_fail;
1247 #endif
1248
1249         /* ensure that ipv6 stubs are visible only after ipv6 is ready */
1250         wmb();
1251         ipv6_stub = &ipv6_stub_impl;
1252         ipv6_bpf_stub = &ipv6_bpf_stub_impl;
1253 out:
1254         return err;
1255
1256 #ifdef CONFIG_SYSCTL
1257 sysctl_fail:
1258         igmp6_late_cleanup();
1259 #endif
1260 igmp6_late_err:
1261         ioam6_exit();
1262 ioam6_fail:
1263         rpl_exit();
1264 rpl_fail:
1265         seg6_exit();
1266 seg6_fail:
1267         calipso_exit();
1268 calipso_fail:
1269         pingv6_exit();
1270 pingv6_fail:
1271         ipv6_packet_cleanup();
1272 ipv6_packet_fail:
1273         tcpv6_exit();
1274 tcpv6_fail:
1275         udpv6_offload_exit();
1276 udpv6_offload_fail:
1277         udplitev6_exit();
1278 udplitev6_fail:
1279         udpv6_exit();
1280 udpv6_fail:
1281         ipv6_frag_exit();
1282 ipv6_frag_fail:
1283         ipv6_exthdrs_exit();
1284 ipv6_exthdrs_fail:
1285         addrconf_cleanup();
1286 addrconf_fail:
1287         ipv6_anycast_cleanup();
1288 ipv6_anycast_fail:
1289         ip6_flowlabel_cleanup();
1290 ip6_flowlabel_fail:
1291         ndisc_late_cleanup();
1292 ndisc_late_fail:
1293         ip6_route_cleanup();
1294 ip6_route_fail:
1295 #ifdef CONFIG_PROC_FS
1296         if6_proc_exit();
1297 proc_if6_fail:
1298         ipv6_misc_proc_exit();
1299 proc_misc6_fail:
1300         udplite6_proc_exit();
1301 proc_udplite6_fail:
1302         raw6_proc_exit();
1303 proc_raw6_fail:
1304 #endif
1305         ipv6_netfilter_fini();
1306 netfilter_fail:
1307         igmp6_cleanup();
1308 igmp_fail:
1309         ndisc_cleanup();
1310 ndisc_fail:
1311         icmpv6_cleanup();
1312 icmp_fail:
1313         ip6_mr_cleanup();
1314 ipmr_fail:
1315         unregister_pernet_subsys(&inet6_net_ops);
1316 register_pernet_fail:
1317         sock_unregister(PF_INET6);
1318         rtnl_unregister_all(PF_INET6);
1319 out_sock_register_fail:
1320         rawv6_exit();
1321 out_unregister_ping_proto:
1322         proto_unregister(&pingv6_prot);
1323 out_unregister_raw_proto:
1324         proto_unregister(&rawv6_prot);
1325 out_unregister_udplite_proto:
1326         proto_unregister(&udplitev6_prot);
1327 out_unregister_udp_proto:
1328         proto_unregister(&udpv6_prot);
1329 out_unregister_tcp_proto:
1330         proto_unregister(&tcpv6_prot);
1331         goto out;
1332 }
1333 module_init(inet6_init);
1334
1335 MODULE_ALIAS_NETPROTO(PF_INET6);