net/ipv4/af_inet.c

   1 /*
   2  * INET         An implementation of the TCP/IP protocol suite for the LINUX
   3  *              operating system.  INET is implemented using the  BSD Socket
   4  *              interface as the means of communication with the user level.
   5  *
   6  *              PF_INET protocol family socket handler.
   7  *
   8  * Authors:     Ross Biro
   9  *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  10  *              Florian La Roche, <flla@stud.uni-sb.de>
  11  *              Alan Cox, <A.Cox@swansea.ac.uk>
  12  *
  13  * Changes (see also sock.c)
  14  *
  15  *              piggy,
  16  *              Karl Knutson    :       Socket protocol table
  17  *              A.N.Kuznetsov   :       Socket death error in accept().
  18  *              John Richardson :       Fix non blocking error in connect()
  19  *                                      so sockets that fail to connect
  20  *                                      don't return -EINPROGRESS.
  21  *              Alan Cox        :       Asynchronous I/O support
  22  *              Alan Cox        :       Keep correct socket pointer on sock
  23  *                                      structures
  24  *                                      when accept() ed
  25  *              Alan Cox        :       Semantics of SO_LINGER aren't state
  26  *                                      moved to close when you look carefully.
  27  *                                      With this fixed and the accept bug fixed
  28  *                                      some RPC stuff seems happier.
  29  *              Niibe Yutaka    :       4.4BSD style write async I/O
  30  *              Alan Cox,
  31  *              Tony Gale       :       Fixed reuse semantics.
  32  *              Alan Cox        :       bind() shouldn't abort existing but dead
  33  *                                      sockets. Stops FTP netin:.. I hope.
  34  *              Alan Cox        :       bind() works correctly for RAW sockets.
  35  *                                      Note that FreeBSD at least was broken
  36  *                                      in this respect so be careful with
  37  *                                      compatibility tests...
  38  *              Alan Cox        :       routing cache support
  39  *              Alan Cox        :       memzero the socket structure for
  40  *                                      compactness.
  41  *              Matt Day        :       nonblock connect error handler
  42  *              Alan Cox        :       Allow large numbers of pending sockets
  43  *                                      (eg for big web sites), but only if
  44  *                                      specifically application requested.
  45  *              Alan Cox        :       New buffering throughout IP. Used
  46  *                                      dumbly.
  47  *              Alan Cox        :       New buffering now used smartly.
  48  *              Alan Cox        :       BSD rather than common sense
  49  *                                      interpretation of listen.
  50  *              Germano Caronni :       Assorted small races.
  51  *              Alan Cox        :       sendmsg/recvmsg basic support.
  52  *              Alan Cox        :       Only sendmsg/recvmsg now supported.
  53  *              Alan Cox        :       Locked down bind (see security list).
  54  *              Alan Cox        :       Loosened bind a little.
  55  *              Mike McLagan    :       ADD/DEL DLCI Ioctls
  56  *      Willy Konynenberg       :       Transparent proxying support.
  57  *              David S. Miller :       New socket lookup architecture.
  58  *                                      Some other random speedups.
  59  *              Cyrus Durgin    :       Cleaned up file for kmod hacks.
  60  *              Andi Kleen      :       Fix inet_stream_connect TCP race.
  61  *
  62  *              This program is free software; you can redistribute it and/or
  63  *              modify it under the terms of the GNU General Public License
  64  *              as published by the Free Software Foundation; either version
  65  *              2 of the License, or (at your option) any later version.
  66  */
  67
  68 #define pr_fmt(fmt) "IPv4: " fmt
  69
  70 #include <linux/err.h>
  71 #include <linux/errno.h>
  72 #include <linux/types.h>
  73 #include <linux/socket.h>
  74 #include <linux/in.h>
  75 #include <linux/kernel.h>
  76 #include <linux/kmod.h>
  77 #include <linux/sched.h>
  78 #include <linux/timer.h>
  79 #include <linux/string.h>
  80 #include <linux/sockios.h>
  81 #include <linux/net.h>
  82 #include <linux/capability.h>
  83 #include <linux/fcntl.h>
  84 #include <linux/mm.h>
  85 #include <linux/interrupt.h>
  86 #include <linux/stat.h>
  87 #include <linux/init.h>
  88 #include <linux/poll.h>
  89 #include <linux/netfilter_ipv4.h>
  90 #include <linux/random.h>
  91 #include <linux/slab.h>
  92
  93 #include <linux/uaccess.h>
  94
  95 #include <linux/inet.h>
  96 #include <linux/igmp.h>
  97 #include <linux/inetdevice.h>
  98 #include <linux/netdevice.h>
  99 #include <net/checksum.h>
 100 #include <net/ip.h>
 101 #include <net/protocol.h>
 102 #include <net/arp.h>
 103 #include <net/route.h>
 104 #include <net/ip_fib.h>
 105 #include <net/inet_connection_sock.h>
 106 #include <net/tcp.h>
 107 #include <net/udp.h>
 108 #include <net/udplite.h>
 109 #include <net/ping.h>
 110 #include <linux/skbuff.h>
 111 #include <net/sock.h>
 112 #include <net/raw.h>
 113 #include <net/icmp.h>
 114 #include <net/inet_common.h>
 115 #include <net/ip_tunnels.h>
 116 #include <net/xfrm.h>
 117 #include <net/net_namespace.h>
 118 #include <net/secure_seq.h>
 119 #ifdef CONFIG_IP_MROUTE
 120 #include <linux/mroute.h>
 121 #endif
 122 #include <net/l3mdev.h>
 123
 124 #include <trace/events/sock.h>
 125
 126 /* The inetsw table contains everything that inet_create needs to
 127  * build a new socket.
 128  */
 129 static struct list_head inetsw[SOCK_MAX];
 130 static DEFINE_SPINLOCK(inetsw_lock);
 131
 132 /* New destruction routine */
 133
 134 void inet_sock_destruct(struct sock *sk)
 135 {
 136         struct inet_sock *inet = inet_sk(sk);
 137
 138         __skb_queue_purge(&sk->sk_receive_queue);
 139         __skb_queue_purge(&sk->sk_error_queue);
 140
 141         sk_mem_reclaim(sk);
 142
 143         if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) {
 144                 pr_err("Attempt to release TCP socket in state %d %p\n",
 145                        sk->sk_state, sk);
 146                 return;
 147         }
 148         if (!sock_flag(sk, SOCK_DEAD)) {
 149                 pr_err("Attempt to release alive inet socket %p\n", sk);
 150                 return;
 151         }
 152
 153         WARN_ON(atomic_read(&sk->sk_rmem_alloc));
 154         WARN_ON(refcount_read(&sk->sk_wmem_alloc));
 155         WARN_ON(sk->sk_wmem_queued);
 156         WARN_ON(sk->sk_forward_alloc);
 157
 158         kfree(rcu_dereference_protected(inet->inet_opt, 1));
 159         dst_release(rcu_dereference_check(sk->sk_dst_cache, 1));
 160         dst_release(sk->sk_rx_dst);
 161         sk_refcnt_debug_dec(sk);
 162 }
 163 EXPORT_SYMBOL(inet_sock_destruct);
 164
 165 /*
 166  *      The routines beyond this point handle the behaviour of an AF_INET
 167  *      socket object. Mostly it punts to the subprotocols of IP to do
 168  *      the work.
 169  */
 170
 171 /*
 172  *      Automatically bind an unbound socket.
 173  */
 174
 175 static int inet_autobind(struct sock *sk)
 176 {
 177         struct inet_sock *inet;
 178         /* We may need to bind the socket. */
 179         lock_sock(sk);
 180         inet = inet_sk(sk);
 181         if (!inet->inet_num) {
 182                 if (sk->sk_prot->get_port(sk, 0)) {
 183                         release_sock(sk);
 184                         return -EAGAIN;
 185                 }
 186                 inet->inet_sport = htons(inet->inet_num);
 187         }
 188         release_sock(sk);
 189         return 0;
 190 }
 191
 192 /*
 193  *      Move a socket into listening state.
 194  */
 195 int inet_listen(struct socket *sock, int backlog)
 196 {
 197         struct sock *sk = sock->sk;
 198         unsigned char old_state;
 199         int err, tcp_fastopen;
 200
 201         lock_sock(sk);
 202
 203         err = -EINVAL;
 204         if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM)
 205                 goto out;
 206
 207         old_state = sk->sk_state;
 208         if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN)))
 209                 goto out;
 210
 211         /* Really, if the socket is already in listen state
 212          * we can only allow the backlog to be adjusted.
 213          */
 214         if (old_state != TCP_LISTEN) {
 215                 /* Enable TFO w/o requiring TCP_FASTOPEN socket option.
 216                  * Note that only TCP sockets (SOCK_STREAM) will reach here.
 217                  * Also fastopen backlog may already been set via the option
 218                  * because the socket was in TCP_LISTEN state previously but
 219                  * was shutdown() rather than close().
 220                  */
 221                 tcp_fastopen = sock_net(sk)->ipv4.sysctl_tcp_fastopen;
 222                 if ((tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) &&
 223                     (tcp_fastopen & TFO_SERVER_ENABLE) &&
 224                     !inet_csk(sk)->icsk_accept_queue.fastopenq.max_qlen) {
 225                         fastopen_queue_tune(sk, backlog);
 226                         tcp_fastopen_init_key_once(sock_net(sk));
 227                 }
 228
 229                 err = inet_csk_listen_start(sk, backlog);
 230                 if (err)
 231                         goto out;
 232                 tcp_call_bpf(sk, BPF_SOCK_OPS_TCP_LISTEN_CB, 0, NULL);
 233         }
 234         sk->sk_max_ack_backlog = backlog;
 235         err = 0;
 236
 237 out:
 238         release_sock(sk);
 239         return err;
 240 }
 241 EXPORT_SYMBOL(inet_listen);
 242
 243 /*
 244  *      Create an inet socket.
 245  */
 246
 247 static int inet_create(struct net *net, struct socket *sock, int protocol,
 248                        int kern)
 249 {
 250         struct sock *sk;
 251         struct inet_protosw *answer;
 252         struct inet_sock *inet;
 253         struct proto *answer_prot;
 254         unsigned char answer_flags;
 255         int try_loading_module = 0;
 256         int err;
 257
 258         if (protocol < 0 || protocol >= IPPROTO_MAX)
 259                 return -EINVAL;
 260
 261         sock->state = SS_UNCONNECTED;
 262
 263         /* Look for the requested type/protocol pair. */
 264 lookup_protocol:
 265         err = -ESOCKTNOSUPPORT;
 266         rcu_read_lock();
 267         list_for_each_entry_rcu(answer, &inetsw[sock->type], list) {
 268
 269                 err = 0;
 270                 /* Check the non-wild match. */
 271                 if (protocol == answer->protocol) {
 272                         if (protocol != IPPROTO_IP)
 273                                 break;
 274                 } else {
 275                         /* Check for the two wild cases. */
 276                         if (IPPROTO_IP == protocol) {
 277                                 protocol = answer->protocol;
 278                                 break;
 279                         }
 280                         if (IPPROTO_IP == answer->protocol)
 281                                 break;
 282                 }
 283                 err = -EPROTONOSUPPORT;
 284         }
 285
 286         if (unlikely(err)) {
 287                 if (try_loading_module < 2) {
 288                         rcu_read_unlock();
 289                         /*
 290                          * Be more specific, e.g. net-pf-2-proto-132-type-1
 291                          * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
 292                          */
 293                         if (++try_loading_module == 1)
 294                                 request_module("net-pf-%d-proto-%d-type-%d",
 295                                                PF_INET, protocol, sock->type);
 296                         /*
 297                          * Fall back to generic, e.g. net-pf-2-proto-132
 298                          * (net-pf-PF_INET-proto-IPPROTO_SCTP)
 299                          */
 300                         else
 301                                 request_module("net-pf-%d-proto-%d",
 302                                                PF_INET, protocol);
 303                         goto lookup_protocol;
 304                 } else
 305                         goto out_rcu_unlock;
 306         }
 307
 308         err = -EPERM;
 309         if (sock->type == SOCK_RAW && !kern &&
 310             !ns_capable(net->user_ns, CAP_NET_RAW))
 311                 goto out_rcu_unlock;
 312
 313         sock->ops = answer->ops;
 314         answer_prot = answer->prot;
 315         answer_flags = answer->flags;
 316         rcu_read_unlock();
 317
 318         WARN_ON(!answer_prot->slab);
 319
 320         err = -ENOBUFS;
 321         sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot, kern);
 322         if (!sk)
 323                 goto out;
 324
 325         err = 0;
 326         if (INET_PROTOSW_REUSE & answer_flags)
 327                 sk->sk_reuse = SK_CAN_REUSE;
 328
 329         inet = inet_sk(sk);
 330         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
 331
 332         inet->nodefrag = 0;
 333
 334         if (SOCK_RAW == sock->type) {
 335                 inet->inet_num = protocol;
 336                 if (IPPROTO_RAW == protocol)
 337                         inet->hdrincl = 1;
 338         }
 339
 340         if (net->ipv4.sysctl_ip_no_pmtu_disc)
 341                 inet->pmtudisc = IP_PMTUDISC_DONT;
 342         else
 343                 inet->pmtudisc = IP_PMTUDISC_WANT;
 344
 345         inet->inet_id = 0;
 346
 347         sock_init_data(sock, sk);
 348
 349         sk->sk_destruct    = inet_sock_destruct;
 350         sk->sk_protocol    = protocol;
 351         sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
 352
 353         inet->uc_ttl    = -1;
 354         inet->mc_loop   = 1;
 355         inet->mc_ttl    = 1;
 356         inet->mc_all    = 1;
 357         inet->mc_index  = 0;
 358         inet->mc_list   = NULL;
 359         inet->rcv_tos   = 0;
 360
 361         sk_refcnt_debug_inc(sk);
 362
 363         if (inet->inet_num) {
 364                 /* It assumes that any protocol which allows
 365                  * the user to assign a number at socket
 366                  * creation time automatically
 367                  * shares.
 368                  */
 369                 inet->inet_sport = htons(inet->inet_num);
 370                 /* Add to protocol hash chains. */
 371                 err = sk->sk_prot->hash(sk);
 372                 if (err) {
 373                         sk_common_release(sk);
 374                         goto out;
 375                 }
 376         }
 377
 378         if (sk->sk_prot->init) {
 379                 err = sk->sk_prot->init(sk);
 380                 if (err) {
 381                         sk_common_release(sk);
 382                         goto out;
 383                 }
 384         }
 385
 386         if (!kern) {
 387                 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
 388                 if (err) {
 389                         sk_common_release(sk);
 390                         goto out;
 391                 }
 392         }
 393 out:
 394         return err;
 395 out_rcu_unlock:
 396         rcu_read_unlock();
 397         goto out;
 398 }
 399
 400
 401 /*
 402  *      The peer socket should always be NULL (or else). When we call this
 403  *      function we are destroying the object and from then on nobody
 404  *      should refer to it.
 405  */
 406 int inet_release(struct socket *sock)
 407 {
 408         struct sock *sk = sock->sk;
 409
 410         if (sk) {
 411                 long timeout;
 412
 413                 /* Applications forget to leave groups before exiting */
 414                 ip_mc_drop_socket(sk);
 415
 416                 /* If linger is set, we don't return until the close
 417                  * is complete.  Otherwise we return immediately. The
 418                  * actually closing is done the same either way.
 419                  *
 420                  * If the close is due to the process exiting, we never
 421                  * linger..
 422                  */
 423                 timeout = 0;
 424                 if (sock_flag(sk, SOCK_LINGER) &&
 425                     !(current->flags & PF_EXITING))
 426                         timeout = sk->sk_lingertime;
 427                 sk->sk_prot->close(sk, timeout);
 428                 sock->sk = NULL;
 429         }
 430         return 0;
 431 }
 432 EXPORT_SYMBOL(inet_release);
 433
 434 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 435 {
 436         struct sock *sk = sock->sk;
 437         int err;
 438
 439         /* If the socket has its own bind function then use it. (RAW) */
 440         if (sk->sk_prot->bind) {
 441                 return sk->sk_prot->bind(sk, uaddr, addr_len);
 442         }
 443         if (addr_len < sizeof(struct sockaddr_in))
 444                 return -EINVAL;
 445
 446         /* BPF prog is run before any checks are done so that if the prog
 447          * changes context in a wrong way it will be caught.
 448          */
 449         err = BPF_CGROUP_RUN_PROG_INET4_BIND(sk, uaddr);
 450         if (err)
 451                 return err;
 452
 453         return __inet_bind(sk, uaddr, addr_len, false, true);
 454 }
 455 EXPORT_SYMBOL(inet_bind);
 456
 457 int __inet_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
 458                 bool force_bind_address_no_port, bool with_lock)
 459 {
 460         struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
 461         struct inet_sock *inet = inet_sk(sk);
 462         struct net *net = sock_net(sk);
 463         unsigned short snum;
 464         int chk_addr_ret;
 465         u32 tb_id = RT_TABLE_LOCAL;
 466         int err;
 467
 468         if (addr->sin_family != AF_INET) {
 469                 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET)
 470                  * only if s_addr is INADDR_ANY.
 471                  */
 472                 err = -EAFNOSUPPORT;
 473                 if (addr->sin_family != AF_UNSPEC ||
 474                     addr->sin_addr.s_addr != htonl(INADDR_ANY))
 475                         goto out;
 476         }
 477
 478         tb_id = l3mdev_fib_table_by_index(net, sk->sk_bound_dev_if) ? : tb_id;
 479         chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id);
 480
 481         /* Not specified by any standard per-se, however it breaks too
 482          * many applications when removed.  It is unfortunate since
 483          * allowing applications to make a non-local bind solves
 484          * several problems with systems using dynamic addressing.
 485          * (ie. your servers still start up even if your ISDN link
 486          *  is temporarily down)
 487          */
 488         err = -EADDRNOTAVAIL;
 489         if (!inet_can_nonlocal_bind(net, inet) &&
 490             addr->sin_addr.s_addr != htonl(INADDR_ANY) &&
 491             chk_addr_ret != RTN_LOCAL &&
 492             chk_addr_ret != RTN_MULTICAST &&
 493             chk_addr_ret != RTN_BROADCAST)
 494                 goto out;
 495
 496         snum = ntohs(addr->sin_port);
 497         err = -EACCES;
 498         if (snum && snum < inet_prot_sock(net) &&
 499             !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
 500                 goto out;
 501
 502         /*      We keep a pair of addresses. rcv_saddr is the one
 503          *      used by hash lookups, and saddr is used for transmit.
 504          *
 505          *      In the BSD API these are the same except where it
 506          *      would be illegal to use them (multicast/broadcast) in
 507          *      which case the sending device address is used.
 508          */
 509         if (with_lock)
 510                 lock_sock(sk);
 511
 512         /* Check these errors (active socket, double bind). */
 513         err = -EINVAL;
 514         if (sk->sk_state != TCP_CLOSE || inet->inet_num)
 515                 goto out_release_sock;
 516
 517         inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
 518         if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
 519                 inet->inet_saddr = 0;  /* Use device */
 520
 521         /* Make sure we are allowed to bind here. */
 522         if (snum || !(inet->bind_address_no_port ||
 523                       force_bind_address_no_port)) {
 524                 if (sk->sk_prot->get_port(sk, snum)) {
 525                         inet->inet_saddr = inet->inet_rcv_saddr = 0;
 526                         err = -EADDRINUSE;
 527                         goto out_release_sock;
 528                 }
 529                 err = BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk);
 530                 if (err) {
 531                         inet->inet_saddr = inet->inet_rcv_saddr = 0;
 532                         goto out_release_sock;
 533                 }
 534         }
 535
 536         if (inet->inet_rcv_saddr)
 537                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
 538         if (snum)
 539                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
 540         inet->inet_sport = htons(inet->inet_num);
 541         inet->inet_daddr = 0;
 542         inet->inet_dport = 0;
 543         sk_dst_reset(sk);
 544         err = 0;
 545 out_release_sock:
 546         if (with_lock)
 547                 release_sock(sk);
 548 out:
 549         return err;
 550 }
 551
 552 int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr,
 553                        int addr_len, int flags)
 554 {
 555         struct sock *sk = sock->sk;
 556         int err;
 557
 558         if (addr_len < sizeof(uaddr->sa_family))
 559                 return -EINVAL;
 560         if (uaddr->sa_family == AF_UNSPEC)
 561                 return sk->sk_prot->disconnect(sk, flags);
 562
 563         if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) {
 564                 err = sk->sk_prot->pre_connect(sk, uaddr, addr_len);
 565                 if (err)
 566                         return err;
 567         }
 568
 569         if (!inet_sk(sk)->inet_num && inet_autobind(sk))
 570                 return -EAGAIN;
 571         return sk->sk_prot->connect(sk, uaddr, addr_len);
 572 }
 573 EXPORT_SYMBOL(inet_dgram_connect);
 574
 575 static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias)
 576 {
 577         DEFINE_WAIT_FUNC(wait, woken_wake_function);
 578
 579         add_wait_queue(sk_sleep(sk), &wait);
 580         sk->sk_write_pending += writebias;
 581
 582         /* Basic assumption: if someone sets sk->sk_err, he _must_
 583          * change state of the socket from TCP_SYN_*.
 584          * Connect() does not allow to get error notifications
 585          * without closing the socket.
 586          */
 587         while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
 588                 release_sock(sk);
 589                 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
 590                 lock_sock(sk);
 591                 if (signal_pending(current) || !timeo)
 592                         break;
 593         }
 594         remove_wait_queue(sk_sleep(sk), &wait);
 595         sk->sk_write_pending -= writebias;
 596         return timeo;
 597 }
 598
 599 /*
 600  *      Connect to a remote host. There is regrettably still a little
 601  *      TCP 'magic' in here.
 602  */
 603 int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
 604                           int addr_len, int flags, int is_sendmsg)
 605 {
 606         struct sock *sk = sock->sk;
 607         int err;
 608         long timeo;
 609
 610         /*
 611          * uaddr can be NULL and addr_len can be 0 if:
 612          * sk is a TCP fastopen active socket and
 613          * TCP_FASTOPEN_CONNECT sockopt is set and
 614          * we already have a valid cookie for this socket.
 615          * In this case, user can call write() after connect().
 616          * write() will invoke tcp_sendmsg_fastopen() which calls
 617          * __inet_stream_connect().
 618          */
 619         if (uaddr) {
 620                 if (addr_len < sizeof(uaddr->sa_family))
 621                         return -EINVAL;
 622
 623                 if (uaddr->sa_family == AF_UNSPEC) {
 624                         err = sk->sk_prot->disconnect(sk, flags);
 625                         sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
 626                         goto out;
 627                 }
 628         }
 629
 630         switch (sock->state) {
 631         default:
 632                 err = -EINVAL;
 633                 goto out;
 634         case SS_CONNECTED:
 635                 err = -EISCONN;
 636                 goto out;
 637         case SS_CONNECTING:
 638                 if (inet_sk(sk)->defer_connect)
 639                         err = is_sendmsg ? -EINPROGRESS : -EISCONN;
 640                 else
 641                         err = -EALREADY;
 642                 /* Fall out of switch with err, set for this state */
 643                 break;
 644         case SS_UNCONNECTED:
 645                 err = -EISCONN;
 646                 if (sk->sk_state != TCP_CLOSE)
 647                         goto out;
 648
 649                 if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) {
 650                         err = sk->sk_prot->pre_connect(sk, uaddr, addr_len);
 651                         if (err)
 652                                 goto out;
 653                 }
 654
 655                 err = sk->sk_prot->connect(sk, uaddr, addr_len);
 656                 if (err < 0)
 657                         goto out;
 658
 659                 sock->state = SS_CONNECTING;
 660
 661                 if (!err && inet_sk(sk)->defer_connect)
 662                         goto out;
 663
 664                 /* Just entered SS_CONNECTING state; the only
 665                  * difference is that return value in non-blocking
 666                  * case is EINPROGRESS, rather than EALREADY.
 667                  */
 668                 err = -EINPROGRESS;
 669                 break;
 670         }
 671
 672         timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
 673
 674         if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
 675                 int writebias = (sk->sk_protocol == IPPROTO_TCP) &&
 676                                 tcp_sk(sk)->fastopen_req &&
 677                                 tcp_sk(sk)->fastopen_req->data ? 1 : 0;
 678
 679                 /* Error code is set above */
 680                 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias))
 681                         goto out;
 682
 683                 err = sock_intr_errno(timeo);
 684                 if (signal_pending(current))
 685                         goto out;
 686         }
 687
 688         /* Connection was closed by RST, timeout, ICMP error
 689          * or another process disconnected us.
 690          */
 691         if (sk->sk_state == TCP_CLOSE)
 692                 goto sock_error;
 693
 694         /* sk->sk_err may be not zero now, if RECVERR was ordered by user
 695          * and error was received after socket entered established state.
 696          * Hence, it is handled normally after connect() return successfully.
 697          */
 698
 699         sock->state = SS_CONNECTED;
 700         err = 0;
 701 out:
 702         return err;
 703
 704 sock_error:
 705         err = sock_error(sk) ? : -ECONNABORTED;
 706         sock->state = SS_UNCONNECTED;
 707         if (sk->sk_prot->disconnect(sk, flags))
 708                 sock->state = SS_DISCONNECTING;
 709         goto out;
 710 }
 711 EXPORT_SYMBOL(__inet_stream_connect);
 712
 713 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
 714                         int addr_len, int flags)
 715 {
 716         int err;
 717
 718         lock_sock(sock->sk);
 719         err = __inet_stream_connect(sock, uaddr, addr_len, flags, 0);
 720         release_sock(sock->sk);
 721         return err;
 722 }
 723 EXPORT_SYMBOL(inet_stream_connect);
 724
 725 /*
 726  *      Accept a pending connection. The TCP layer now gives BSD semantics.
 727  */
 728
 729 int inet_accept(struct socket *sock, struct socket *newsock, int flags,
 730                 bool kern)
 731 {
 732         struct sock *sk1 = sock->sk;
 733         int err = -EINVAL;
 734         struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err, kern);
 735
 736         if (!sk2)
 737                 goto do_err;
 738
 739         lock_sock(sk2);
 740
 741         sock_rps_record_flow(sk2);
 742         WARN_ON(!((1 << sk2->sk_state) &
 743                   (TCPF_ESTABLISHED | TCPF_SYN_RECV |
 744                   TCPF_CLOSE_WAIT | TCPF_CLOSE)));
 745
 746         sock_graft(sk2, newsock);
 747
 748         newsock->state = SS_CONNECTED;
 749         err = 0;
 750         release_sock(sk2);
 751 do_err:
 752         return err;
 753 }
 754 EXPORT_SYMBOL(inet_accept);
 755
 756
 757 /*
 758  *      This does both peername and sockname.
 759  */
 760 int inet_getname(struct socket *sock, struct sockaddr *uaddr,
 761                         int peer)
 762 {
 763         struct sock *sk         = sock->sk;
 764         struct inet_sock *inet  = inet_sk(sk);
 765         DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr);
 766
 767         sin->sin_family = AF_INET;
 768         if (peer) {
 769                 if (!inet->inet_dport ||
 770                     (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
 771                      peer == 1))
 772                         return -ENOTCONN;
 773                 sin->sin_port = inet->inet_dport;
 774                 sin->sin_addr.s_addr = inet->inet_daddr;
 775         } else {
 776                 __be32 addr = inet->inet_rcv_saddr;
 777                 if (!addr)
 778                         addr = inet->inet_saddr;
 779                 sin->sin_port = inet->inet_sport;
 780                 sin->sin_addr.s_addr = addr;
 781         }
 782         memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 783         return sizeof(*sin);
 784 }
 785 EXPORT_SYMBOL(inet_getname);
 786
 787 int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
 788 {
 789         struct sock *sk = sock->sk;
 790
 791         sock_rps_record_flow(sk);
 792
 793         /* We may need to bind the socket. */
 794         if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
 795             inet_autobind(sk))
 796                 return -EAGAIN;
 797
 798         return sk->sk_prot->sendmsg(sk, msg, size);
 799 }
 800 EXPORT_SYMBOL(inet_sendmsg);
 801
 802 ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset,
 803                       size_t size, int flags)
 804 {
 805         struct sock *sk = sock->sk;
 806
 807         sock_rps_record_flow(sk);
 808
 809         /* We may need to bind the socket. */
 810         if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
 811             inet_autobind(sk))
 812                 return -EAGAIN;
 813
 814         if (sk->sk_prot->sendpage)
 815                 return sk->sk_prot->sendpage(sk, page, offset, size, flags);
 816         return sock_no_sendpage(sock, page, offset, size, flags);
 817 }
 818 EXPORT_SYMBOL(inet_sendpage);
 819
 820 int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
 821                  int flags)
 822 {
 823         struct sock *sk = sock->sk;
 824         int addr_len = 0;
 825         int err;
 826
 827         if (likely(!(flags & MSG_ERRQUEUE)))
 828                 sock_rps_record_flow(sk);
 829
 830         err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
 831                                    flags & ~MSG_DONTWAIT, &addr_len);
 832         if (err >= 0)
 833                 msg->msg_namelen = addr_len;
 834         return err;
 835 }
 836 EXPORT_SYMBOL(inet_recvmsg);
 837
 838 int inet_shutdown(struct socket *sock, int how)
 839 {
 840         struct sock *sk = sock->sk;
 841         int err = 0;
 842
 843         /* This should really check to make sure
 844          * the socket is a TCP socket. (WHY AC...)
 845          */
 846         how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
 847                        1->2 bit 2 snds.
 848                        2->3 */
 849         if ((how & ~SHUTDOWN_MASK) || !how)     /* MAXINT->0 */
 850                 return -EINVAL;
 851
 852         lock_sock(sk);
 853         if (sock->state == SS_CONNECTING) {
 854                 if ((1 << sk->sk_state) &
 855                     (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
 856                         sock->state = SS_DISCONNECTING;
 857                 else
 858                         sock->state = SS_CONNECTED;
 859         }
 860
 861         switch (sk->sk_state) {
 862         case TCP_CLOSE:
 863                 err = -ENOTCONN;
 864                 /* Hack to wake up other listeners, who can poll for
 865                    EPOLLHUP, even on eg. unconnected UDP sockets -- RR */
 866                 /* fall through */
 867         default:
 868                 sk->sk_shutdown |= how;
 869                 if (sk->sk_prot->shutdown)
 870                         sk->sk_prot->shutdown(sk, how);
 871                 break;
 872
 873         /* Remaining two branches are temporary solution for missing
 874          * close() in multithreaded environment. It is _not_ a good idea,
 875          * but we have no choice until close() is repaired at VFS level.
 876          */
 877         case TCP_LISTEN:
 878                 if (!(how & RCV_SHUTDOWN))
 879                         break;
 880                 /* fall through */
 881         case TCP_SYN_SENT:
 882                 err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
 883                 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
 884                 break;
 885         }
 886
 887         /* Wake up anyone sleeping in poll. */
 888         sk->sk_state_change(sk);
 889         release_sock(sk);
 890         return err;
 891 }
 892 EXPORT_SYMBOL(inet_shutdown);
 893
 894 /*
 895  *      ioctl() calls you can issue on an INET socket. Most of these are
 896  *      device configuration and stuff and very rarely used. Some ioctls
 897  *      pass on to the socket itself.
 898  *
 899  *      NOTE: I like the idea of a module for the config stuff. ie ifconfig
 900  *      loads the devconfigure module does its configuring and unloads it.
 901  *      There's a good 20K of config code hanging around the kernel.
 902  */
 903
 904 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 905 {
 906         struct sock *sk = sock->sk;
 907         int err = 0;
 908         struct net *net = sock_net(sk);
 909         void __user *p = (void __user *)arg;
 910         struct ifreq ifr;
 911         struct rtentry rt;
 912
 913         switch (cmd) {
 914         case SIOCGSTAMP:
 915                 err = sock_get_timestamp(sk, (struct timeval __user *)arg);
 916                 break;
 917         case SIOCGSTAMPNS:
 918                 err = sock_get_timestampns(sk, (struct timespec __user *)arg);
 919                 break;
 920         case SIOCADDRT:
 921         case SIOCDELRT:
 922                 if (copy_from_user(&rt, p, sizeof(struct rtentry)))
 923                         return -EFAULT;
 924                 err = ip_rt_ioctl(net, cmd, &rt);
 925                 break;
 926         case SIOCRTMSG:
 927                 err = -EINVAL;
 928                 break;
 929         case SIOCDARP:
 930         case SIOCGARP:
 931         case SIOCSARP:
 932                 err = arp_ioctl(net, cmd, (void __user *)arg);
 933                 break;
 934         case SIOCGIFADDR:
 935         case SIOCGIFBRDADDR:
 936         case SIOCGIFNETMASK:
 937         case SIOCGIFDSTADDR:
 938         case SIOCGIFPFLAGS:
 939                 if (copy_from_user(&ifr, p, sizeof(struct ifreq)))
 940                         return -EFAULT;
 941                 err = devinet_ioctl(net, cmd, &ifr);
 942                 if (!err && copy_to_user(p, &ifr, sizeof(struct ifreq)))
 943                         err = -EFAULT;
 944                 break;
 945
 946         case SIOCSIFADDR:
 947         case SIOCSIFBRDADDR:
 948         case SIOCSIFNETMASK:
 949         case SIOCSIFDSTADDR:
 950         case SIOCSIFPFLAGS:
 951         case SIOCSIFFLAGS:
 952                 if (copy_from_user(&ifr, p, sizeof(struct ifreq)))
 953                         return -EFAULT;
 954                 err = devinet_ioctl(net, cmd, &ifr);
 955                 break;
 956         default:
 957                 if (sk->sk_prot->ioctl)
 958                         err = sk->sk_prot->ioctl(sk, cmd, arg);
 959                 else
 960                         err = -ENOIOCTLCMD;
 961                 break;
 962         }
 963         return err;
 964 }
 965 EXPORT_SYMBOL(inet_ioctl);
 966
 967 #ifdef CONFIG_COMPAT
 968 static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 969 {
 970         struct sock *sk = sock->sk;
 971         int err = -ENOIOCTLCMD;
 972
 973         if (sk->sk_prot->compat_ioctl)
 974                 err = sk->sk_prot->compat_ioctl(sk, cmd, arg);
 975
 976         return err;
 977 }
 978 #endif
 979
 980 const struct proto_ops inet_stream_ops = {
 981         .family            = PF_INET,
 982         .owner             = THIS_MODULE,
 983         .release           = inet_release,
 984         .bind              = inet_bind,
 985         .connect           = inet_stream_connect,
 986         .socketpair        = sock_no_socketpair,
 987         .accept            = inet_accept,
 988         .getname           = inet_getname,
 989         .poll              = tcp_poll,
 990         .ioctl             = inet_ioctl,
 991         .listen            = inet_listen,
 992         .shutdown          = inet_shutdown,
 993         .setsockopt        = sock_common_setsockopt,
 994         .getsockopt        = sock_common_getsockopt,
 995         .sendmsg           = inet_sendmsg,
 996         .recvmsg           = inet_recvmsg,
 997 #ifdef CONFIG_MMU
 998         .mmap              = tcp_mmap,
 999 #endif
1000         .sendpage          = inet_sendpage,
1001         .splice_read       = tcp_splice_read,
1002         .read_sock         = tcp_read_sock,
1003         .sendmsg_locked    = tcp_sendmsg_locked,
1004         .sendpage_locked   = tcp_sendpage_locked,
1005         .peek_len          = tcp_peek_len,
1006 #ifdef CONFIG_COMPAT
1007         .compat_setsockopt = compat_sock_common_setsockopt,
1008         .compat_getsockopt = compat_sock_common_getsockopt,
1009         .compat_ioctl      = inet_compat_ioctl,
1010 #endif
1011         .set_rcvlowat      = tcp_set_rcvlowat,
1012 };
1013 EXPORT_SYMBOL(inet_stream_ops);
1014
1015 const struct proto_ops inet_dgram_ops = {
1016         .family            = PF_INET,
1017         .owner             = THIS_MODULE,
1018         .release           = inet_release,
1019         .bind              = inet_bind,
1020         .connect           = inet_dgram_connect,
1021         .socketpair        = sock_no_socketpair,
1022         .accept            = sock_no_accept,
1023         .getname           = inet_getname,
1024         .poll              = udp_poll,
1025         .ioctl             = inet_ioctl,
1026         .listen            = sock_no_listen,
1027         .shutdown          = inet_shutdown,
1028         .setsockopt        = sock_common_setsockopt,
1029         .getsockopt        = sock_common_getsockopt,
1030         .sendmsg           = inet_sendmsg,
1031         .recvmsg           = inet_recvmsg,
1032         .mmap              = sock_no_mmap,
1033         .sendpage          = inet_sendpage,
1034         .set_peek_off      = sk_set_peek_off,
1035 #ifdef CONFIG_COMPAT
1036         .compat_setsockopt = compat_sock_common_setsockopt,
1037         .compat_getsockopt = compat_sock_common_getsockopt,
1038         .compat_ioctl      = inet_compat_ioctl,
1039 #endif
1040 };
1041 EXPORT_SYMBOL(inet_dgram_ops);
1042
1043 /*
1044  * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
1045  * udp_poll
1046  */
1047 static const struct proto_ops inet_sockraw_ops = {
1048         .family            = PF_INET,
1049         .owner             = THIS_MODULE,
1050         .release           = inet_release,
1051         .bind              = inet_bind,
1052         .connect           = inet_dgram_connect,
1053         .socketpair        = sock_no_socketpair,
1054         .accept            = sock_no_accept,
1055         .getname           = inet_getname,
1056         .poll              = datagram_poll,
1057         .ioctl             = inet_ioctl,
1058         .listen            = sock_no_listen,
1059         .shutdown          = inet_shutdown,
1060         .setsockopt        = sock_common_setsockopt,
1061         .getsockopt        = sock_common_getsockopt,
1062         .sendmsg           = inet_sendmsg,
1063         .recvmsg           = inet_recvmsg,
1064         .mmap              = sock_no_mmap,
1065         .sendpage          = inet_sendpage,
1066 #ifdef CONFIG_COMPAT
1067         .compat_setsockopt = compat_sock_common_setsockopt,
1068         .compat_getsockopt = compat_sock_common_getsockopt,
1069         .compat_ioctl      = inet_compat_ioctl,
1070 #endif
1071 };
1072
1073 static const struct net_proto_family inet_family_ops = {
1074         .family = PF_INET,
1075         .create = inet_create,
1076         .owner  = THIS_MODULE,
1077 };
1078
1079 /* Upon startup we insert all the elements in inetsw_array[] into
1080  * the linked list inetsw.
1081  */
1082 static struct inet_protosw inetsw_array[] =
1083 {
1084         {
1085                 .type =       SOCK_STREAM,
1086                 .protocol =   IPPROTO_TCP,
1087                 .prot =       &tcp_prot,
1088                 .ops =        &inet_stream_ops,
1089                 .flags =      INET_PROTOSW_PERMANENT |
1090                               INET_PROTOSW_ICSK,
1091         },
1092
1093         {
1094                 .type =       SOCK_DGRAM,
1095                 .protocol =   IPPROTO_UDP,
1096                 .prot =       &udp_prot,
1097                 .ops =        &inet_dgram_ops,
1098                 .flags =      INET_PROTOSW_PERMANENT,
1099        },
1100
1101        {
1102                 .type =       SOCK_DGRAM,
1103                 .protocol =   IPPROTO_ICMP,
1104                 .prot =       &ping_prot,
1105                 .ops =        &inet_sockraw_ops,
1106                 .flags =      INET_PROTOSW_REUSE,
1107        },
1108
1109        {
1110                .type =       SOCK_RAW,
1111                .protocol =   IPPROTO_IP,        /* wild card */
1112                .prot =       &raw_prot,
1113                .ops =        &inet_sockraw_ops,
1114                .flags =      INET_PROTOSW_REUSE,
1115        }
1116 };
1117
1118 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
1119
1120 void inet_register_protosw(struct inet_protosw *p)
1121 {
1122         struct list_head *lh;
1123         struct inet_protosw *answer;
1124         int protocol = p->protocol;
1125         struct list_head *last_perm;
1126
1127         spin_lock_bh(&inetsw_lock);
1128
1129         if (p->type >= SOCK_MAX)
1130                 goto out_illegal;
1131
1132         /* If we are trying to override a permanent protocol, bail. */
1133         last_perm = &inetsw[p->type];
1134         list_for_each(lh, &inetsw[p->type]) {
1135                 answer = list_entry(lh, struct inet_protosw, list);
1136                 /* Check only the non-wild match. */
1137                 if ((INET_PROTOSW_PERMANENT & answer->flags) == 0)
1138                         break;
1139                 if (protocol == answer->protocol)
1140                         goto out_permanent;
1141                 last_perm = lh;
1142         }
1143
1144         /* Add the new entry after the last permanent entry if any, so that
1145          * the new entry does not override a permanent entry when matched with
1146          * a wild-card protocol. But it is allowed to override any existing
1147          * non-permanent entry.  This means that when we remove this entry, the
1148          * system automatically returns to the old behavior.
1149          */
1150         list_add_rcu(&p->list, last_perm);
1151 out:
1152         spin_unlock_bh(&inetsw_lock);
1153
1154         return;
1155
1156 out_permanent:
1157         pr_err("Attempt to override permanent protocol %d\n", protocol);
1158         goto out;
1159
1160 out_illegal:
1161         pr_err("Ignoring attempt to register invalid socket type %d\n",
1162                p->type);
1163         goto out;
1164 }
1165 EXPORT_SYMBOL(inet_register_protosw);
1166
1167 void inet_unregister_protosw(struct inet_protosw *p)
1168 {
1169         if (INET_PROTOSW_PERMANENT & p->flags) {
1170                 pr_err("Attempt to unregister permanent protocol %d\n",
1171                        p->protocol);
1172         } else {
1173                 spin_lock_bh(&inetsw_lock);
1174                 list_del_rcu(&p->list);
1175                 spin_unlock_bh(&inetsw_lock);
1176
1177                 synchronize_net();
1178         }
1179 }
1180 EXPORT_SYMBOL(inet_unregister_protosw);
1181
1182 static int inet_sk_reselect_saddr(struct sock *sk)
1183 {
1184         struct inet_sock *inet = inet_sk(sk);
1185         __be32 old_saddr = inet->inet_saddr;
1186         __be32 daddr = inet->inet_daddr;
1187         struct flowi4 *fl4;
1188         struct rtable *rt;
1189         __be32 new_saddr;
1190         struct ip_options_rcu *inet_opt;
1191
1192         inet_opt = rcu_dereference_protected(inet->inet_opt,
1193                                              lockdep_sock_is_held(sk));
1194         if (inet_opt && inet_opt->opt.srr)
1195                 daddr = inet_opt->opt.faddr;
1196
1197         /* Query new route. */
1198         fl4 = &inet->cork.fl.u.ip4;
1199         rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk),
1200                               sk->sk_bound_dev_if, sk->sk_protocol,
1201                               inet->inet_sport, inet->inet_dport, sk);
1202         if (IS_ERR(rt))
1203                 return PTR_ERR(rt);
1204
1205         sk_setup_caps(sk, &rt->dst);
1206
1207         new_saddr = fl4->saddr;
1208
1209         if (new_saddr == old_saddr)
1210                 return 0;
1211
1212         if (sock_net(sk)->ipv4.sysctl_ip_dynaddr > 1) {
1213                 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n",
1214                         __func__, &old_saddr, &new_saddr);
1215         }
1216
1217         inet->inet_saddr = inet->inet_rcv_saddr = new_saddr;
1218
1219         /*
1220          * XXX The only one ugly spot where we need to
1221          * XXX really change the sockets identity after
1222          * XXX it has entered the hashes. -DaveM
1223          *
1224          * Besides that, it does not check for connection
1225          * uniqueness. Wait for troubles.
1226          */
1227         return __sk_prot_rehash(sk);
1228 }
1229
1230 int inet_sk_rebuild_header(struct sock *sk)
1231 {
1232         struct inet_sock *inet = inet_sk(sk);
1233         struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0);
1234         __be32 daddr;
1235         struct ip_options_rcu *inet_opt;
1236         struct flowi4 *fl4;
1237         int err;
1238
1239         /* Route is OK, nothing to do. */
1240         if (rt)
1241                 return 0;
1242
1243         /* Reroute. */
1244         rcu_read_lock();
1245         inet_opt = rcu_dereference(inet->inet_opt);
1246         daddr = inet->inet_daddr;
1247         if (inet_opt && inet_opt->opt.srr)
1248                 daddr = inet_opt->opt.faddr;
1249         rcu_read_unlock();
1250         fl4 = &inet->cork.fl.u.ip4;
1251         rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr,
1252                                    inet->inet_dport, inet->inet_sport,
1253                                    sk->sk_protocol, RT_CONN_FLAGS(sk),
1254                                    sk->sk_bound_dev_if);
1255         if (!IS_ERR(rt)) {
1256                 err = 0;
1257                 sk_setup_caps(sk, &rt->dst);
1258         } else {
1259                 err = PTR_ERR(rt);
1260
1261                 /* Routing failed... */
1262                 sk->sk_route_caps = 0;
1263                 /*
1264                  * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1265                  * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1266                  */
1267                 if (!sock_net(sk)->ipv4.sysctl_ip_dynaddr ||
1268                     sk->sk_state != TCP_SYN_SENT ||
1269                     (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
1270                     (err = inet_sk_reselect_saddr(sk)) != 0)
1271                         sk->sk_err_soft = -err;
1272         }
1273
1274         return err;
1275 }
1276 EXPORT_SYMBOL(inet_sk_rebuild_header);
1277
1278 void inet_sk_set_state(struct sock *sk, int state)
1279 {
1280         trace_inet_sock_set_state(sk, sk->sk_state, state);
1281         sk->sk_state = state;
1282 }
1283 EXPORT_SYMBOL(inet_sk_set_state);
1284
1285 void inet_sk_state_store(struct sock *sk, int newstate)
1286 {
1287         trace_inet_sock_set_state(sk, sk->sk_state, newstate);
1288         smp_store_release(&sk->sk_state, newstate);
1289 }
1290
1291 struct sk_buff *inet_gso_segment(struct sk_buff *skb,
1292                                  netdev_features_t features)
1293 {
1294         bool udpfrag = false, fixedid = false, gso_partial, encap;
1295         struct sk_buff *segs = ERR_PTR(-EINVAL);
1296         const struct net_offload *ops;
1297         unsigned int offset = 0;
1298         struct iphdr *iph;
1299         int proto, tot_len;
1300         int nhoff;
1301         int ihl;
1302         int id;
1303
1304         skb_reset_network_header(skb);
1305         nhoff = skb_network_header(skb) - skb_mac_header(skb);
1306         if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1307                 goto out;
1308
1309         iph = ip_hdr(skb);
1310         ihl = iph->ihl * 4;
1311         if (ihl < sizeof(*iph))
1312                 goto out;
1313
1314         id = ntohs(iph->id);
1315         proto = iph->protocol;
1316
1317         /* Warning: after this point, iph might be no longer valid */
1318         if (unlikely(!pskb_may_pull(skb, ihl)))
1319                 goto out;
1320         __skb_pull(skb, ihl);
1321
1322         encap = SKB_GSO_CB(skb)->encap_level > 0;
1323         if (encap)
1324                 features &= skb->dev->hw_enc_features;
1325         SKB_GSO_CB(skb)->encap_level += ihl;
1326
1327         skb_reset_transport_header(skb);
1328
1329         segs = ERR_PTR(-EPROTONOSUPPORT);
1330
1331         if (!skb->encapsulation || encap) {
1332                 udpfrag = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP);
1333                 fixedid = !!(skb_shinfo(skb)->gso_type & SKB_GSO_TCP_FIXEDID);
1334
1335                 /* fixed ID is invalid if DF bit is not set */
1336                 if (fixedid && !(ip_hdr(skb)->frag_off & htons(IP_DF)))
1337                         goto out;
1338         }
1339
1340         ops = rcu_dereference(inet_offloads[proto]);
1341         if (likely(ops && ops->callbacks.gso_segment)) {
1342                 segs = ops->callbacks.gso_segment(skb, features);
1343                 if (!segs)
1344                         skb->network_header = skb_mac_header(skb) + nhoff - skb->head;
1345         }
1346
1347         if (IS_ERR_OR_NULL(segs))
1348                 goto out;
1349
1350         gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL);
1351
1352         skb = segs;
1353         do {
1354                 iph = (struct iphdr *)(skb_mac_header(skb) + nhoff);
1355                 if (udpfrag) {
1356                         iph->frag_off = htons(offset >> 3);
1357                         if (skb->next)
1358                                 iph->frag_off |= htons(IP_MF);
1359                         offset += skb->len - nhoff - ihl;
1360                         tot_len = skb->len - nhoff;
1361                 } else if (skb_is_gso(skb)) {
1362                         if (!fixedid) {
1363                                 iph->id = htons(id);
1364                                 id += skb_shinfo(skb)->gso_segs;
1365                         }
1366
1367                         if (gso_partial)
1368                                 tot_len = skb_shinfo(skb)->gso_size +
1369                                           SKB_GSO_CB(skb)->data_offset +
1370                                           skb->head - (unsigned char *)iph;
1371                         else
1372                                 tot_len = skb->len - nhoff;
1373                 } else {
1374                         if (!fixedid)
1375                                 iph->id = htons(id++);
1376                         tot_len = skb->len - nhoff;
1377                 }
1378                 iph->tot_len = htons(tot_len);
1379                 ip_send_check(iph);
1380                 if (encap)
1381                         skb_reset_inner_headers(skb);
1382                 skb->network_header = (u8 *)iph - skb->head;
1383                 skb_reset_mac_len(skb);
1384         } while ((skb = skb->next));
1385
1386 out:
1387         return segs;
1388 }
1389 EXPORT_SYMBOL(inet_gso_segment);
1390
1391 struct sk_buff *inet_gro_receive(struct list_head *head, struct sk_buff *skb)
1392 {
1393         const struct net_offload *ops;
1394         struct sk_buff *pp = NULL;
1395         const struct iphdr *iph;
1396         struct sk_buff *p;
1397         unsigned int hlen;
1398         unsigned int off;
1399         unsigned int id;
1400         int flush = 1;
1401         int proto;
1402
1403         off = skb_gro_offset(skb);
1404         hlen = off + sizeof(*iph);
1405         iph = skb_gro_header_fast(skb, off);
1406         if (skb_gro_header_hard(skb, hlen)) {
1407                 iph = skb_gro_header_slow(skb, hlen, off);
1408                 if (unlikely(!iph))
1409                         goto out;
1410         }
1411
1412         proto = iph->protocol;
1413
1414         rcu_read_lock();
1415         ops = rcu_dereference(inet_offloads[proto]);
1416         if (!ops || !ops->callbacks.gro_receive)
1417                 goto out_unlock;
1418
1419         if (*(u8 *)iph != 0x45)
1420                 goto out_unlock;
1421
1422         if (ip_is_fragment(iph))
1423                 goto out_unlock;
1424
1425         if (unlikely(ip_fast_csum((u8 *)iph, 5)))
1426                 goto out_unlock;
1427
1428         id = ntohl(*(__be32 *)&iph->id);
1429         flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF));
1430         id >>= 16;
1431
1432         list_for_each_entry(p, head, list) {
1433                 struct iphdr *iph2;
1434                 u16 flush_id;
1435
1436                 if (!NAPI_GRO_CB(p)->same_flow)
1437                         continue;
1438
1439                 iph2 = (struct iphdr *)(p->data + off);
1440                 /* The above works because, with the exception of the top
1441                  * (inner most) layer, we only aggregate pkts with the same
1442                  * hdr length so all the hdrs we'll need to verify will start
1443                  * at the same offset.
1444                  */
1445                 if ((iph->protocol ^ iph2->protocol) |
1446                     ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) |
1447                     ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) {
1448                         NAPI_GRO_CB(p)->same_flow = 0;
1449                         continue;
1450                 }
1451
1452                 /* All fields must match except length and checksum. */
1453                 NAPI_GRO_CB(p)->flush |=
1454                         (iph->ttl ^ iph2->ttl) |
1455                         (iph->tos ^ iph2->tos) |
1456                         ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF));
1457
1458                 NAPI_GRO_CB(p)->flush |= flush;
1459
1460                 /* We need to store of the IP ID check to be included later
1461                  * when we can verify that this packet does in fact belong
1462                  * to a given flow.
1463                  */
1464                 flush_id = (u16)(id - ntohs(iph2->id));
1465
1466                 /* This bit of code makes it much easier for us to identify
1467                  * the cases where we are doing atomic vs non-atomic IP ID
1468                  * checks.  Specifically an atomic check can return IP ID
1469                  * values 0 - 0xFFFF, while a non-atomic check can only
1470                  * return 0 or 0xFFFF.
1471                  */
1472                 if (!NAPI_GRO_CB(p)->is_atomic ||
1473                     !(iph->frag_off & htons(IP_DF))) {
1474                         flush_id ^= NAPI_GRO_CB(p)->count;
1475                         flush_id = flush_id ? 0xFFFF : 0;
1476                 }
1477
1478                 /* If the previous IP ID value was based on an atomic
1479                  * datagram we can overwrite the value and ignore it.
1480                  */
1481                 if (NAPI_GRO_CB(skb)->is_atomic)
1482                         NAPI_GRO_CB(p)->flush_id = flush_id;
1483                 else
1484                         NAPI_GRO_CB(p)->flush_id |= flush_id;
1485         }
1486
1487         NAPI_GRO_CB(skb)->is_atomic = !!(iph->frag_off & htons(IP_DF));
1488         NAPI_GRO_CB(skb)->flush |= flush;
1489         skb_set_network_header(skb, off);
1490         /* The above will be needed by the transport layer if there is one
1491          * immediately following this IP hdr.
1492          */
1493
1494         /* Note : No need to call skb_gro_postpull_rcsum() here,
1495          * as we already checked checksum over ipv4 header was 0
1496          */
1497         skb_gro_pull(skb, sizeof(*iph));
1498         skb_set_transport_header(skb, skb_gro_offset(skb));
1499
1500         pp = call_gro_receive(ops->callbacks.gro_receive, head, skb);
1501
1502 out_unlock:
1503         rcu_read_unlock();
1504
1505 out:
1506         skb_gro_flush_final(skb, pp, flush);
1507
1508         return pp;
1509 }
1510 EXPORT_SYMBOL(inet_gro_receive);
1511
1512 static struct sk_buff *ipip_gro_receive(struct list_head *head,
1513                                         struct sk_buff *skb)
1514 {
1515         if (NAPI_GRO_CB(skb)->encap_mark) {
1516                 NAPI_GRO_CB(skb)->flush = 1;
1517                 return NULL;
1518         }
1519
1520         NAPI_GRO_CB(skb)->encap_mark = 1;
1521
1522         return inet_gro_receive(head, skb);
1523 }
1524
1525 #define SECONDS_PER_DAY 86400
1526
1527 /* inet_current_timestamp - Return IP network timestamp
1528  *
1529  * Return milliseconds since midnight in network byte order.
1530  */
1531 __be32 inet_current_timestamp(void)
1532 {
1533         u32 secs;
1534         u32 msecs;
1535         struct timespec64 ts;
1536
1537         ktime_get_real_ts64(&ts);
1538
1539         /* Get secs since midnight. */
1540         (void)div_u64_rem(ts.tv_sec, SECONDS_PER_DAY, &secs);
1541         /* Convert to msecs. */
1542         msecs = secs * MSEC_PER_SEC;
1543         /* Convert nsec to msec. */
1544         msecs += (u32)ts.tv_nsec / NSEC_PER_MSEC;
1545
1546         /* Convert to network byte order. */
1547         return htonl(msecs);
1548 }
1549 EXPORT_SYMBOL(inet_current_timestamp);
1550
1551 int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
1552 {
1553         if (sk->sk_family == AF_INET)
1554                 return ip_recv_error(sk, msg, len, addr_len);
1555 #if IS_ENABLED(CONFIG_IPV6)
1556         if (sk->sk_family == AF_INET6)
1557                 return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len);
1558 #endif
1559         return -EINVAL;
1560 }
1561
1562 int inet_gro_complete(struct sk_buff *skb, int nhoff)
1563 {
1564         __be16 newlen = htons(skb->len - nhoff);
1565         struct iphdr *iph = (struct iphdr *)(skb->data + nhoff);
1566         const struct net_offload *ops;
1567         int proto = iph->protocol;
1568         int err = -ENOSYS;
1569
1570         if (skb->encapsulation) {
1571                 skb_set_inner_protocol(skb, cpu_to_be16(ETH_P_IP));
1572                 skb_set_inner_network_header(skb, nhoff);
1573         }
1574
1575         csum_replace2(&iph->check, iph->tot_len, newlen);
1576         iph->tot_len = newlen;
1577
1578         rcu_read_lock();
1579         ops = rcu_dereference(inet_offloads[proto]);
1580         if (WARN_ON(!ops || !ops->callbacks.gro_complete))
1581                 goto out_unlock;
1582
1583         /* Only need to add sizeof(*iph) to get to the next hdr below
1584          * because any hdr with option will have been flushed in
1585          * inet_gro_receive().
1586          */
1587         err = ops->callbacks.gro_complete(skb, nhoff + sizeof(*iph));
1588
1589 out_unlock:
1590         rcu_read_unlock();
1591
1592         return err;
1593 }
1594 EXPORT_SYMBOL(inet_gro_complete);
1595
1596 static int ipip_gro_complete(struct sk_buff *skb, int nhoff)
1597 {
1598         skb->encapsulation = 1;
1599         skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4;
1600         return inet_gro_complete(skb, nhoff);
1601 }
1602
1603 int inet_ctl_sock_create(struct sock **sk, unsigned short family,
1604                          unsigned short type, unsigned char protocol,
1605                          struct net *net)
1606 {
1607         struct socket *sock;
1608         int rc = sock_create_kern(net, family, type, protocol, &sock);
1609
1610         if (rc == 0) {
1611                 *sk = sock->sk;
1612                 (*sk)->sk_allocation = GFP_ATOMIC;
1613                 /*
1614                  * Unhash it so that IP input processing does not even see it,
1615                  * we do not wish this socket to see incoming packets.
1616                  */
1617                 (*sk)->sk_prot->unhash(*sk);
1618         }
1619         return rc;
1620 }
1621 EXPORT_SYMBOL_GPL(inet_ctl_sock_create);
1622
1623 u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offt)
1624 {
1625         return  *(((unsigned long *)per_cpu_ptr(mib, cpu)) + offt);
1626 }
1627 EXPORT_SYMBOL_GPL(snmp_get_cpu_field);
1628
1629 unsigned long snmp_fold_field(void __percpu *mib, int offt)
1630 {
1631         unsigned long res = 0;
1632         int i;
1633
1634         for_each_possible_cpu(i)
1635                 res += snmp_get_cpu_field(mib, i, offt);
1636         return res;
1637 }
1638 EXPORT_SYMBOL_GPL(snmp_fold_field);
1639
1640 #if BITS_PER_LONG==32
1641
1642 u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offt,
1643                          size_t syncp_offset)
1644 {
1645         void *bhptr;
1646         struct u64_stats_sync *syncp;
1647         u64 v;
1648         unsigned int start;
1649
1650         bhptr = per_cpu_ptr(mib, cpu);
1651         syncp = (struct u64_stats_sync *)(bhptr + syncp_offset);
1652         do {
1653                 start = u64_stats_fetch_begin_irq(syncp);
1654                 v = *(((u64 *)bhptr) + offt);
1655         } while (u64_stats_fetch_retry_irq(syncp, start));
1656
1657         return v;
1658 }
1659 EXPORT_SYMBOL_GPL(snmp_get_cpu_field64);
1660
1661 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset)
1662 {
1663         u64 res = 0;
1664         int cpu;
1665
1666         for_each_possible_cpu(cpu) {
1667                 res += snmp_get_cpu_field64(mib, cpu, offt, syncp_offset);
1668         }
1669         return res;
1670 }
1671 EXPORT_SYMBOL_GPL(snmp_fold_field64);
1672 #endif
1673
1674 #ifdef CONFIG_IP_MULTICAST
1675 static const struct net_protocol igmp_protocol = {
1676         .handler =      igmp_rcv,
1677         .netns_ok =     1,
1678 };
1679 #endif
1680
1681 /* thinking of making this const? Don't.
1682  * early_demux can change based on sysctl.
1683  */
1684 static struct net_protocol tcp_protocol = {
1685         .early_demux    =       tcp_v4_early_demux,
1686         .early_demux_handler =  tcp_v4_early_demux,
1687         .handler        =       tcp_v4_rcv,
1688         .err_handler    =       tcp_v4_err,
1689         .no_policy      =       1,
1690         .netns_ok       =       1,
1691         .icmp_strict_tag_validation = 1,
1692 };
1693
1694 /* thinking of making this const? Don't.
1695  * early_demux can change based on sysctl.
1696  */
1697 static struct net_protocol udp_protocol = {
1698         .early_demux =  udp_v4_early_demux,
1699         .early_demux_handler =  udp_v4_early_demux,
1700         .handler =      udp_rcv,
1701         .err_handler =  udp_err,
1702         .no_policy =    1,
1703         .netns_ok =     1,
1704 };
1705
1706 static const struct net_protocol icmp_protocol = {
1707         .handler =      icmp_rcv,
1708         .err_handler =  icmp_err,
1709         .no_policy =    1,
1710         .netns_ok =     1,
1711 };
1712
1713 static __net_init int ipv4_mib_init_net(struct net *net)
1714 {
1715         int i;
1716
1717         net->mib.tcp_statistics = alloc_percpu(struct tcp_mib);
1718         if (!net->mib.tcp_statistics)
1719                 goto err_tcp_mib;
1720         net->mib.ip_statistics = alloc_percpu(struct ipstats_mib);
1721         if (!net->mib.ip_statistics)
1722                 goto err_ip_mib;
1723
1724         for_each_possible_cpu(i) {
1725                 struct ipstats_mib *af_inet_stats;
1726                 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i);
1727                 u64_stats_init(&af_inet_stats->syncp);
1728         }
1729
1730         net->mib.net_statistics = alloc_percpu(struct linux_mib);
1731         if (!net->mib.net_statistics)
1732                 goto err_net_mib;
1733         net->mib.udp_statistics = alloc_percpu(struct udp_mib);
1734         if (!net->mib.udp_statistics)
1735                 goto err_udp_mib;
1736         net->mib.udplite_statistics = alloc_percpu(struct udp_mib);
1737         if (!net->mib.udplite_statistics)
1738                 goto err_udplite_mib;
1739         net->mib.icmp_statistics = alloc_percpu(struct icmp_mib);
1740         if (!net->mib.icmp_statistics)
1741                 goto err_icmp_mib;
1742         net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib),
1743                                               GFP_KERNEL);
1744         if (!net->mib.icmpmsg_statistics)
1745                 goto err_icmpmsg_mib;
1746
1747         tcp_mib_init(net);
1748         return 0;
1749
1750 err_icmpmsg_mib:
1751         free_percpu(net->mib.icmp_statistics);
1752 err_icmp_mib:
1753         free_percpu(net->mib.udplite_statistics);
1754 err_udplite_mib:
1755         free_percpu(net->mib.udp_statistics);
1756 err_udp_mib:
1757         free_percpu(net->mib.net_statistics);
1758 err_net_mib:
1759         free_percpu(net->mib.ip_statistics);
1760 err_ip_mib:
1761         free_percpu(net->mib.tcp_statistics);
1762 err_tcp_mib:
1763         return -ENOMEM;
1764 }
1765
1766 static __net_exit void ipv4_mib_exit_net(struct net *net)
1767 {
1768         kfree(net->mib.icmpmsg_statistics);
1769         free_percpu(net->mib.icmp_statistics);
1770         free_percpu(net->mib.udplite_statistics);
1771         free_percpu(net->mib.udp_statistics);
1772         free_percpu(net->mib.net_statistics);
1773         free_percpu(net->mib.ip_statistics);
1774         free_percpu(net->mib.tcp_statistics);
1775 }
1776
1777 static __net_initdata struct pernet_operations ipv4_mib_ops = {
1778         .init = ipv4_mib_init_net,
1779         .exit = ipv4_mib_exit_net,
1780 };
1781
1782 static int __init init_ipv4_mibs(void)
1783 {
1784         return register_pernet_subsys(&ipv4_mib_ops);
1785 }
1786
1787 static __net_init int inet_init_net(struct net *net)
1788 {
1789         /*
1790          * Set defaults for local port range
1791          */
1792         seqlock_init(&net->ipv4.ip_local_ports.lock);
1793         net->ipv4.ip_local_ports.range[0] =  32768;
1794         net->ipv4.ip_local_ports.range[1] =  60999;
1795
1796         seqlock_init(&net->ipv4.ping_group_range.lock);
1797         /*
1798          * Sane defaults - nobody may create ping sockets.
1799          * Boot scripts should set this to distro-specific group.
1800          */
1801         net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1);
1802         net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0);
1803
1804         /* Default values for sysctl-controlled parameters.
1805          * We set them here, in case sysctl is not compiled.
1806          */
1807         net->ipv4.sysctl_ip_default_ttl = IPDEFTTL;
1808         net->ipv4.sysctl_ip_fwd_update_priority = 1;
1809         net->ipv4.sysctl_ip_dynaddr = 0;
1810         net->ipv4.sysctl_ip_early_demux = 1;
1811         net->ipv4.sysctl_udp_early_demux = 1;
1812         net->ipv4.sysctl_tcp_early_demux = 1;
1813 #ifdef CONFIG_SYSCTL
1814         net->ipv4.sysctl_ip_prot_sock = PROT_SOCK;
1815 #endif
1816
1817         /* Some igmp sysctl, whose values are always used */
1818         net->ipv4.sysctl_igmp_max_memberships = 20;
1819         net->ipv4.sysctl_igmp_max_msf = 10;
1820         /* IGMP reports for link-local multicast groups are enabled by default */
1821         net->ipv4.sysctl_igmp_llm_reports = 1;
1822         net->ipv4.sysctl_igmp_qrv = 2;
1823
1824         return 0;
1825 }
1826
1827 static __net_exit void inet_exit_net(struct net *net)
1828 {
1829 }
1830
1831 static __net_initdata struct pernet_operations af_inet_ops = {
1832         .init = inet_init_net,
1833         .exit = inet_exit_net,
1834 };
1835
1836 static int __init init_inet_pernet_ops(void)
1837 {
1838         return register_pernet_subsys(&af_inet_ops);
1839 }
1840
1841 static int ipv4_proc_init(void);
1842
1843 /*
1844  *      IP protocol layer initialiser
1845  */
1846
1847 static struct packet_offload ip_packet_offload __read_mostly = {
1848         .type = cpu_to_be16(ETH_P_IP),
1849         .callbacks = {
1850                 .gso_segment = inet_gso_segment,
1851                 .gro_receive = inet_gro_receive,
1852                 .gro_complete = inet_gro_complete,
1853         },
1854 };
1855
1856 static const struct net_offload ipip_offload = {
1857         .callbacks = {
1858                 .gso_segment    = inet_gso_segment,
1859                 .gro_receive    = ipip_gro_receive,
1860                 .gro_complete   = ipip_gro_complete,
1861         },
1862 };
1863
1864 static int __init ipip_offload_init(void)
1865 {
1866         return inet_add_offload(&ipip_offload, IPPROTO_IPIP);
1867 }
1868
1869 static int __init ipv4_offload_init(void)
1870 {
1871         /*
1872          * Add offloads
1873          */
1874         if (udpv4_offload_init() < 0)
1875                 pr_crit("%s: Cannot add UDP protocol offload\n", __func__);
1876         if (tcpv4_offload_init() < 0)
1877                 pr_crit("%s: Cannot add TCP protocol offload\n", __func__);
1878         if (ipip_offload_init() < 0)
1879                 pr_crit("%s: Cannot add IPIP protocol offload\n", __func__);
1880
1881         dev_add_offload(&ip_packet_offload);
1882         return 0;
1883 }
1884
1885 fs_initcall(ipv4_offload_init);
1886
1887 static struct packet_type ip_packet_type __read_mostly = {
1888         .type = cpu_to_be16(ETH_P_IP),
1889         .func = ip_rcv,
1890         .list_func = ip_list_rcv,
1891 };
1892
1893 static int __init inet_init(void)
1894 {
1895         struct inet_protosw *q;
1896         struct list_head *r;
1897         int rc = -EINVAL;
1898
1899         sock_skb_cb_check_size(sizeof(struct inet_skb_parm));
1900
1901         rc = proto_register(&tcp_prot, 1);
1902         if (rc)
1903                 goto out;
1904
1905         rc = proto_register(&udp_prot, 1);
1906         if (rc)
1907                 goto out_unregister_tcp_proto;
1908
1909         rc = proto_register(&raw_prot, 1);
1910         if (rc)
1911                 goto out_unregister_udp_proto;
1912
1913         rc = proto_register(&ping_prot, 1);
1914         if (rc)
1915                 goto out_unregister_raw_proto;
1916
1917         /*
1918          *      Tell SOCKET that we are alive...
1919          */
1920
1921         (void)sock_register(&inet_family_ops);
1922
1923 #ifdef CONFIG_SYSCTL
1924         ip_static_sysctl_init();
1925 #endif
1926
1927         /*
1928          *      Add all the base protocols.
1929          */
1930
1931         if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
1932                 pr_crit("%s: Cannot add ICMP protocol\n", __func__);
1933         if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0)
1934                 pr_crit("%s: Cannot add UDP protocol\n", __func__);
1935         if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0)
1936                 pr_crit("%s: Cannot add TCP protocol\n", __func__);
1937 #ifdef CONFIG_IP_MULTICAST
1938         if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
1939                 pr_crit("%s: Cannot add IGMP protocol\n", __func__);
1940 #endif
1941
1942         /* Register the socket-side information for inet_create. */
1943         for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
1944                 INIT_LIST_HEAD(r);
1945
1946         for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
1947                 inet_register_protosw(q);
1948
1949         /*
1950          *      Set the ARP module up
1951          */
1952
1953         arp_init();
1954
1955         /*
1956          *      Set the IP module up
1957          */
1958
1959         ip_init();
1960
1961         /* Initialise per-cpu ipv4 mibs */
1962         if (init_ipv4_mibs())
1963                 panic("%s: Cannot init ipv4 mibs\n", __func__);
1964
1965         /* Setup TCP slab cache for open requests. */
1966         tcp_init();
1967
1968         /* Setup UDP memory threshold */
1969         udp_init();
1970
1971         /* Add UDP-Lite (RFC 3828) */
1972         udplite4_register();
1973
1974         ping_init();
1975
1976         /*
1977          *      Set the ICMP layer up
1978          */
1979
1980         if (icmp_init() < 0)
1981                 panic("Failed to create the ICMP control socket.\n");
1982
1983         /*
1984          *      Initialise the multicast router
1985          */
1986 #if defined(CONFIG_IP_MROUTE)
1987         if (ip_mr_init())
1988                 pr_crit("%s: Cannot init ipv4 mroute\n", __func__);
1989 #endif
1990
1991         if (init_inet_pernet_ops())
1992                 pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__);
1993
1994         ipv4_proc_init();
1995
1996         ipfrag_init();
1997
1998         dev_add_pack(&ip_packet_type);
1999
2000         ip_tunnel_core_init();
2001
2002         rc = 0;
2003 out:
2004         return rc;
2005 out_unregister_raw_proto:
2006         proto_unregister(&raw_prot);
2007 out_unregister_udp_proto:
2008         proto_unregister(&udp_prot);
2009 out_unregister_tcp_proto:
2010         proto_unregister(&tcp_prot);
2011         goto out;
2012 }
2013
2014 fs_initcall(inet_init);
2015
2016 /* ------------------------------------------------------------------------ */
2017
2018 #ifdef CONFIG_PROC_FS
2019 static int __init ipv4_proc_init(void)
2020 {
2021         int rc = 0;
2022
2023         if (raw_proc_init())
2024                 goto out_raw;
2025         if (tcp4_proc_init())
2026                 goto out_tcp;
2027         if (udp4_proc_init())
2028                 goto out_udp;
2029         if (ping_proc_init())
2030                 goto out_ping;
2031         if (ip_misc_proc_init())
2032                 goto out_misc;
2033 out:
2034         return rc;
2035 out_misc:
2036         ping_proc_exit();
2037 out_ping:
2038         udp4_proc_exit();
2039 out_udp:
2040         tcp4_proc_exit();
2041 out_tcp:
2042         raw_proc_exit();
2043 out_raw:
2044         rc = -ENOMEM;
2045         goto out;
2046 }
2047
2048 #else /* CONFIG_PROC_FS */
2049 static int __init ipv4_proc_init(void)
2050 {
2051         return 0;
2052 }
2053 #endif /* CONFIG_PROC_FS */