linux/net/ipv4/af_inet.c
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   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * INET         An implementation of the TCP/IP protocol suite for the LINUX
   4 *              operating system.  INET is implemented using the  BSD Socket
   5 *              interface as the means of communication with the user level.
   6 *
   7 *              PF_INET protocol family socket handler.
   8 *
   9 * Authors:     Ross Biro
  10 *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  11 *              Florian La Roche, <flla@stud.uni-sb.de>
  12 *              Alan Cox, <A.Cox@swansea.ac.uk>
  13 *
  14 * Changes (see also sock.c)
  15 *
  16 *              piggy,
  17 *              Karl Knutson    :       Socket protocol table
  18 *              A.N.Kuznetsov   :       Socket death error in accept().
  19 *              John Richardson :       Fix non blocking error in connect()
  20 *                                      so sockets that fail to connect
  21 *                                      don't return -EINPROGRESS.
  22 *              Alan Cox        :       Asynchronous I/O support
  23 *              Alan Cox        :       Keep correct socket pointer on sock
  24 *                                      structures
  25 *                                      when accept() ed
  26 *              Alan Cox        :       Semantics of SO_LINGER aren't state
  27 *                                      moved to close when you look carefully.
  28 *                                      With this fixed and the accept bug fixed
  29 *                                      some RPC stuff seems happier.
  30 *              Niibe Yutaka    :       4.4BSD style write async I/O
  31 *              Alan Cox,
  32 *              Tony Gale       :       Fixed reuse semantics.
  33 *              Alan Cox        :       bind() shouldn't abort existing but dead
  34 *                                      sockets. Stops FTP netin:.. I hope.
  35 *              Alan Cox        :       bind() works correctly for RAW sockets.
  36 *                                      Note that FreeBSD at least was broken
  37 *                                      in this respect so be careful with
  38 *                                      compatibility tests...
  39 *              Alan Cox        :       routing cache support
  40 *              Alan Cox        :       memzero the socket structure for
  41 *                                      compactness.
  42 *              Matt Day        :       nonblock connect error handler
  43 *              Alan Cox        :       Allow large numbers of pending sockets
  44 *                                      (eg for big web sites), but only if
  45 *                                      specifically application requested.
  46 *              Alan Cox        :       New buffering throughout IP. Used
  47 *                                      dumbly.
  48 *              Alan Cox        :       New buffering now used smartly.
  49 *              Alan Cox        :       BSD rather than common sense
  50 *                                      interpretation of listen.
  51 *              Germano Caronni :       Assorted small races.
  52 *              Alan Cox        :       sendmsg/recvmsg basic support.
  53 *              Alan Cox        :       Only sendmsg/recvmsg now supported.
  54 *              Alan Cox        :       Locked down bind (see security list).
  55 *              Alan Cox        :       Loosened bind a little.
  56 *              Mike McLagan    :       ADD/DEL DLCI Ioctls
  57 *      Willy Konynenberg       :       Transparent proxying support.
  58 *              David S. Miller :       New socket lookup architecture.
  59 *                                      Some other random speedups.
  60 *              Cyrus Durgin    :       Cleaned up file for kmod hacks.
  61 *              Andi Kleen      :       Fix inet_stream_connect TCP race.
  62 */
  63
  64#define pr_fmt(fmt) "IPv4: " fmt
  65
  66#include <linux/err.h>
  67#include <linux/errno.h>
  68#include <linux/types.h>
  69#include <linux/socket.h>
  70#include <linux/in.h>
  71#include <linux/kernel.h>
  72#include <linux/kmod.h>
  73#include <linux/sched.h>
  74#include <linux/timer.h>
  75#include <linux/string.h>
  76#include <linux/sockios.h>
  77#include <linux/net.h>
  78#include <linux/capability.h>
  79#include <linux/fcntl.h>
  80#include <linux/mm.h>
  81#include <linux/interrupt.h>
  82#include <linux/stat.h>
  83#include <linux/init.h>
  84#include <linux/poll.h>
  85#include <linux/netfilter_ipv4.h>
  86#include <linux/random.h>
  87#include <linux/slab.h>
  88
  89#include <linux/uaccess.h>
  90
  91#include <linux/inet.h>
  92#include <linux/igmp.h>
  93#include <linux/inetdevice.h>
  94#include <linux/netdevice.h>
  95#include <net/checksum.h>
  96#include <net/ip.h>
  97#include <net/protocol.h>
  98#include <net/arp.h>
  99#include <net/route.h>
 100#include <net/ip_fib.h>
 101#include <net/inet_connection_sock.h>
 102#include <net/tcp.h>
 103#include <net/udp.h>
 104#include <net/udplite.h>
 105#include <net/ping.h>
 106#include <linux/skbuff.h>
 107#include <net/sock.h>
 108#include <net/raw.h>
 109#include <net/icmp.h>
 110#include <net/inet_common.h>
 111#include <net/ip_tunnels.h>
 112#include <net/xfrm.h>
 113#include <net/net_namespace.h>
 114#include <net/secure_seq.h>
 115#ifdef CONFIG_IP_MROUTE
 116#include <linux/mroute.h>
 117#endif
 118#include <net/l3mdev.h>
 119
 120#include <trace/events/sock.h>
 121
 122/* The inetsw table contains everything that inet_create needs to
 123 * build a new socket.
 124 */
 125static struct list_head inetsw[SOCK_MAX];
 126static DEFINE_SPINLOCK(inetsw_lock);
 127
 128/* New destruction routine */
 129
 130void inet_sock_destruct(struct sock *sk)
 131{
 132        struct inet_sock *inet = inet_sk(sk);
 133
 134        __skb_queue_purge(&sk->sk_receive_queue);
 135        if (sk->sk_rx_skb_cache) {
 136                __kfree_skb(sk->sk_rx_skb_cache);
 137                sk->sk_rx_skb_cache = NULL;
 138        }
 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_protected(sk->sk_dst_cache, 1));
 160        dst_release(sk->sk_rx_dst);
 161        sk_refcnt_debug_dec(sk);
 162}
 163EXPORT_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
 175static 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 */
 195int 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        WRITE_ONCE(sk->sk_max_ack_backlog, backlog);
 212        /* Really, if the socket is already in listen state
 213         * we can only allow the backlog to be adjusted.
 214         */
 215        if (old_state != TCP_LISTEN) {
 216                /* Enable TFO w/o requiring TCP_FASTOPEN socket option.
 217                 * Note that only TCP sockets (SOCK_STREAM) will reach here.
 218                 * Also fastopen backlog may already been set via the option
 219                 * because the socket was in TCP_LISTEN state previously but
 220                 * was shutdown() rather than close().
 221                 */
 222                tcp_fastopen = sock_net(sk)->ipv4.sysctl_tcp_fastopen;
 223                if ((tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) &&
 224                    (tcp_fastopen & TFO_SERVER_ENABLE) &&
 225                    !inet_csk(sk)->icsk_accept_queue.fastopenq.max_qlen) {
 226                        fastopen_queue_tune(sk, backlog);
 227                        tcp_fastopen_init_key_once(sock_net(sk));
 228                }
 229
 230                err = inet_csk_listen_start(sk, backlog);
 231                if (err)
 232                        goto out;
 233                tcp_call_bpf(sk, BPF_SOCK_OPS_TCP_LISTEN_CB, 0, NULL);
 234        }
 235        err = 0;
 236
 237out:
 238        release_sock(sk);
 239        return err;
 240}
 241EXPORT_SYMBOL(inet_listen);
 242
 243/*
 244 *      Create an inet socket.
 245 */
 246
 247static 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. */
 264lookup_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        }
 393out:
 394        return err;
 395out_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 */
 406int 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}
 432EXPORT_SYMBOL(inet_release);
 433
 434int 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}
 455EXPORT_SYMBOL(inet_bind);
 456
 457int __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 && inet_port_requires_bind_service(net, snum) &&
 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;
 545out_release_sock:
 546        if (with_lock)
 547                release_sock(sk);
 548out:
 549        return err;
 550}
 551
 552int 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}
 573EXPORT_SYMBOL(inet_dgram_connect);
 574
 575static 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 */
 603int __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;
 701out:
 702        return err;
 703
 704sock_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}
 711EXPORT_SYMBOL(__inet_stream_connect);
 712
 713int 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}
 723EXPORT_SYMBOL(inet_stream_connect);
 724
 725/*
 726 *      Accept a pending connection. The TCP layer now gives BSD semantics.
 727 */
 728
 729int 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);
 751do_err:
 752        return err;
 753}
 754EXPORT_SYMBOL(inet_accept);
 755
 756
 757/*
 758 *      This does both peername and sockname.
 759 */
 760int 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}
 785EXPORT_SYMBOL(inet_getname);
 786
 787int inet_send_prepare(struct sock *sk)
 788{
 789        sock_rps_record_flow(sk);
 790
 791        /* We may need to bind the socket. */
 792        if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
 793            inet_autobind(sk))
 794                return -EAGAIN;
 795
 796        return 0;
 797}
 798EXPORT_SYMBOL_GPL(inet_send_prepare);
 799
 800int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
 801{
 802        struct sock *sk = sock->sk;
 803
 804        if (unlikely(inet_send_prepare(sk)))
 805                return -EAGAIN;
 806
 807        return INDIRECT_CALL_2(sk->sk_prot->sendmsg, tcp_sendmsg, udp_sendmsg,
 808                               sk, msg, size);
 809}
 810EXPORT_SYMBOL(inet_sendmsg);
 811
 812ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset,
 813                      size_t size, int flags)
 814{
 815        struct sock *sk = sock->sk;
 816
 817        if (unlikely(inet_send_prepare(sk)))
 818                return -EAGAIN;
 819
 820        if (sk->sk_prot->sendpage)
 821                return sk->sk_prot->sendpage(sk, page, offset, size, flags);
 822        return sock_no_sendpage(sock, page, offset, size, flags);
 823}
 824EXPORT_SYMBOL(inet_sendpage);
 825
 826INDIRECT_CALLABLE_DECLARE(int udp_recvmsg(struct sock *, struct msghdr *,
 827                                          size_t, int, int, int *));
 828int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
 829                 int flags)
 830{
 831        struct sock *sk = sock->sk;
 832        int addr_len = 0;
 833        int err;
 834
 835        if (likely(!(flags & MSG_ERRQUEUE)))
 836                sock_rps_record_flow(sk);
 837
 838        err = INDIRECT_CALL_2(sk->sk_prot->recvmsg, tcp_recvmsg, udp_recvmsg,
 839                              sk, msg, size, flags & MSG_DONTWAIT,
 840                              flags & ~MSG_DONTWAIT, &addr_len);
 841        if (err >= 0)
 842                msg->msg_namelen = addr_len;
 843        return err;
 844}
 845EXPORT_SYMBOL(inet_recvmsg);
 846
 847int inet_shutdown(struct socket *sock, int how)
 848{
 849        struct sock *sk = sock->sk;
 850        int err = 0;
 851
 852        /* This should really check to make sure
 853         * the socket is a TCP socket. (WHY AC...)
 854         */
 855        how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
 856                       1->2 bit 2 snds.
 857                       2->3 */
 858        if ((how & ~SHUTDOWN_MASK) || !how)     /* MAXINT->0 */
 859                return -EINVAL;
 860
 861        lock_sock(sk);
 862        if (sock->state == SS_CONNECTING) {
 863                if ((1 << sk->sk_state) &
 864                    (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
 865                        sock->state = SS_DISCONNECTING;
 866                else
 867                        sock->state = SS_CONNECTED;
 868        }
 869
 870        switch (sk->sk_state) {
 871        case TCP_CLOSE:
 872                err = -ENOTCONN;
 873                /* Hack to wake up other listeners, who can poll for
 874                   EPOLLHUP, even on eg. unconnected UDP sockets -- RR */
 875                /* fall through */
 876        default:
 877                sk->sk_shutdown |= how;
 878                if (sk->sk_prot->shutdown)
 879                        sk->sk_prot->shutdown(sk, how);
 880                break;
 881
 882        /* Remaining two branches are temporary solution for missing
 883         * close() in multithreaded environment. It is _not_ a good idea,
 884         * but we have no choice until close() is repaired at VFS level.
 885         */
 886        case TCP_LISTEN:
 887                if (!(how & RCV_SHUTDOWN))
 888                        break;
 889                /* fall through */
 890        case TCP_SYN_SENT:
 891                err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
 892                sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
 893                break;
 894        }
 895
 896        /* Wake up anyone sleeping in poll. */
 897        sk->sk_state_change(sk);
 898        release_sock(sk);
 899        return err;
 900}
 901EXPORT_SYMBOL(inet_shutdown);
 902
 903/*
 904 *      ioctl() calls you can issue on an INET socket. Most of these are
 905 *      device configuration and stuff and very rarely used. Some ioctls
 906 *      pass on to the socket itself.
 907 *
 908 *      NOTE: I like the idea of a module for the config stuff. ie ifconfig
 909 *      loads the devconfigure module does its configuring and unloads it.
 910 *      There's a good 20K of config code hanging around the kernel.
 911 */
 912
 913int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 914{
 915        struct sock *sk = sock->sk;
 916        int err = 0;
 917        struct net *net = sock_net(sk);
 918        void __user *p = (void __user *)arg;
 919        struct ifreq ifr;
 920        struct rtentry rt;
 921
 922        switch (cmd) {
 923        case SIOCADDRT:
 924        case SIOCDELRT:
 925                if (copy_from_user(&rt, p, sizeof(struct rtentry)))
 926                        return -EFAULT;
 927                err = ip_rt_ioctl(net, cmd, &rt);
 928                break;
 929        case SIOCRTMSG:
 930                err = -EINVAL;
 931                break;
 932        case SIOCDARP:
 933        case SIOCGARP:
 934        case SIOCSARP:
 935                err = arp_ioctl(net, cmd, (void __user *)arg);
 936                break;
 937        case SIOCGIFADDR:
 938        case SIOCGIFBRDADDR:
 939        case SIOCGIFNETMASK:
 940        case SIOCGIFDSTADDR:
 941        case SIOCGIFPFLAGS:
 942                if (copy_from_user(&ifr, p, sizeof(struct ifreq)))
 943                        return -EFAULT;
 944                err = devinet_ioctl(net, cmd, &ifr);
 945                if (!err && copy_to_user(p, &ifr, sizeof(struct ifreq)))
 946                        err = -EFAULT;
 947                break;
 948
 949        case SIOCSIFADDR:
 950        case SIOCSIFBRDADDR:
 951        case SIOCSIFNETMASK:
 952        case SIOCSIFDSTADDR:
 953        case SIOCSIFPFLAGS:
 954        case SIOCSIFFLAGS:
 955                if (copy_from_user(&ifr, p, sizeof(struct ifreq)))
 956                        return -EFAULT;
 957                err = devinet_ioctl(net, cmd, &ifr);
 958                break;
 959        default:
 960                if (sk->sk_prot->ioctl)
 961                        err = sk->sk_prot->ioctl(sk, cmd, arg);
 962                else
 963                        err = -ENOIOCTLCMD;
 964                break;
 965        }
 966        return err;
 967}
 968EXPORT_SYMBOL(inet_ioctl);
 969
 970#ifdef CONFIG_COMPAT
 971static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 972{
 973        struct sock *sk = sock->sk;
 974        int err = -ENOIOCTLCMD;
 975
 976        if (sk->sk_prot->compat_ioctl)
 977                err = sk->sk_prot->compat_ioctl(sk, cmd, arg);
 978
 979        return err;
 980}
 981#endif
 982
 983const struct proto_ops inet_stream_ops = {
 984        .family            = PF_INET,
 985        .owner             = THIS_MODULE,
 986        .release           = inet_release,
 987        .bind              = inet_bind,
 988        .connect           = inet_stream_connect,
 989        .socketpair        = sock_no_socketpair,
 990        .accept            = inet_accept,
 991        .getname           = inet_getname,
 992        .poll              = tcp_poll,
 993        .ioctl             = inet_ioctl,
 994        .gettstamp         = sock_gettstamp,
 995        .listen            = inet_listen,
 996        .shutdown          = inet_shutdown,
 997        .setsockopt        = sock_common_setsockopt,
 998        .getsockopt        = sock_common_getsockopt,
 999        .sendmsg           = inet_sendmsg,
1000        .recvmsg           = inet_recvmsg,
1001#ifdef CONFIG_MMU
1002        .mmap              = tcp_mmap,
1003#endif
1004        .sendpage          = inet_sendpage,
1005        .splice_read       = tcp_splice_read,
1006        .read_sock         = tcp_read_sock,
1007        .sendmsg_locked    = tcp_sendmsg_locked,
1008        .sendpage_locked   = tcp_sendpage_locked,
1009        .peek_len          = tcp_peek_len,
1010#ifdef CONFIG_COMPAT
1011        .compat_setsockopt = compat_sock_common_setsockopt,
1012        .compat_getsockopt = compat_sock_common_getsockopt,
1013        .compat_ioctl      = inet_compat_ioctl,
1014#endif
1015        .set_rcvlowat      = tcp_set_rcvlowat,
1016};
1017EXPORT_SYMBOL(inet_stream_ops);
1018
1019const struct proto_ops inet_dgram_ops = {
1020        .family            = PF_INET,
1021        .owner             = THIS_MODULE,
1022        .release           = inet_release,
1023        .bind              = inet_bind,
1024        .connect           = inet_dgram_connect,
1025        .socketpair        = sock_no_socketpair,
1026        .accept            = sock_no_accept,
1027        .getname           = inet_getname,
1028        .poll              = udp_poll,
1029        .ioctl             = inet_ioctl,
1030        .gettstamp         = sock_gettstamp,
1031        .listen            = sock_no_listen,
1032        .shutdown          = inet_shutdown,
1033        .setsockopt        = sock_common_setsockopt,
1034        .getsockopt        = sock_common_getsockopt,
1035        .sendmsg           = inet_sendmsg,
1036        .recvmsg           = inet_recvmsg,
1037        .mmap              = sock_no_mmap,
1038        .sendpage          = inet_sendpage,
1039        .set_peek_off      = sk_set_peek_off,
1040#ifdef CONFIG_COMPAT
1041        .compat_setsockopt = compat_sock_common_setsockopt,
1042        .compat_getsockopt = compat_sock_common_getsockopt,
1043        .compat_ioctl      = inet_compat_ioctl,
1044#endif
1045};
1046EXPORT_SYMBOL(inet_dgram_ops);
1047
1048/*
1049 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
1050 * udp_poll
1051 */
1052static const struct proto_ops inet_sockraw_ops = {
1053        .family            = PF_INET,
1054        .owner             = THIS_MODULE,
1055        .release           = inet_release,
1056        .bind              = inet_bind,
1057        .connect           = inet_dgram_connect,
1058        .socketpair        = sock_no_socketpair,
1059        .accept            = sock_no_accept,
1060        .getname           = inet_getname,
1061        .poll              = datagram_poll,
1062        .ioctl             = inet_ioctl,
1063        .gettstamp         = sock_gettstamp,
1064        .listen            = sock_no_listen,
1065        .shutdown          = inet_shutdown,
1066        .setsockopt        = sock_common_setsockopt,
1067        .getsockopt        = sock_common_getsockopt,
1068        .sendmsg           = inet_sendmsg,
1069        .recvmsg           = inet_recvmsg,
1070        .mmap              = sock_no_mmap,
1071        .sendpage          = inet_sendpage,
1072#ifdef CONFIG_COMPAT
1073        .compat_setsockopt = compat_sock_common_setsockopt,
1074        .compat_getsockopt = compat_sock_common_getsockopt,
1075        .compat_ioctl      = inet_compat_ioctl,
1076#endif
1077};
1078
1079static const struct net_proto_family inet_family_ops = {
1080        .family = PF_INET,
1081        .create = inet_create,
1082        .owner  = THIS_MODULE,
1083};
1084
1085/* Upon startup we insert all the elements in inetsw_array[] into
1086 * the linked list inetsw.
1087 */
1088static struct inet_protosw inetsw_array[] =
1089{
1090        {
1091                .type =       SOCK_STREAM,
1092                .protocol =   IPPROTO_TCP,
1093                .prot =       &tcp_prot,
1094                .ops =        &inet_stream_ops,
1095                .flags =      INET_PROTOSW_PERMANENT |
1096                              INET_PROTOSW_ICSK,
1097        },
1098
1099        {
1100                .type =       SOCK_DGRAM,
1101                .protocol =   IPPROTO_UDP,
1102                .prot =       &udp_prot,
1103                .ops =        &inet_dgram_ops,
1104                .flags =      INET_PROTOSW_PERMANENT,
1105       },
1106
1107       {
1108                .type =       SOCK_DGRAM,
1109                .protocol =   IPPROTO_ICMP,
1110                .prot =       &ping_prot,
1111                .ops =        &inet_sockraw_ops,
1112                .flags =      INET_PROTOSW_REUSE,
1113       },
1114
1115       {
1116               .type =       SOCK_RAW,
1117               .protocol =   IPPROTO_IP,        /* wild card */
1118               .prot =       &raw_prot,
1119               .ops =        &inet_sockraw_ops,
1120               .flags =      INET_PROTOSW_REUSE,
1121       }
1122};
1123
1124#define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
1125
1126void inet_register_protosw(struct inet_protosw *p)
1127{
1128        struct list_head *lh;
1129        struct inet_protosw *answer;
1130        int protocol = p->protocol;
1131        struct list_head *last_perm;
1132
1133        spin_lock_bh(&inetsw_lock);
1134
1135        if (p->type >= SOCK_MAX)
1136                goto out_illegal;
1137
1138        /* If we are trying to override a permanent protocol, bail. */
1139        last_perm = &inetsw[p->type];
1140        list_for_each(lh, &inetsw[p->type]) {
1141                answer = list_entry(lh, struct inet_protosw, list);
1142                /* Check only the non-wild match. */
1143                if ((INET_PROTOSW_PERMANENT & answer->flags) == 0)
1144                        break;
1145                if (protocol == answer->protocol)
1146                        goto out_permanent;
1147                last_perm = lh;
1148        }
1149
1150        /* Add the new entry after the last permanent entry if any, so that
1151         * the new entry does not override a permanent entry when matched with
1152         * a wild-card protocol. But it is allowed to override any existing
1153         * non-permanent entry.  This means that when we remove this entry, the
1154         * system automatically returns to the old behavior.
1155         */
1156        list_add_rcu(&p->list, last_perm);
1157out:
1158        spin_unlock_bh(&inetsw_lock);
1159
1160        return;
1161
1162out_permanent:
1163        pr_err("Attempt to override permanent protocol %d\n", protocol);
1164        goto out;
1165
1166out_illegal:
1167        pr_err("Ignoring attempt to register invalid socket type %d\n",
1168               p->type);
1169        goto out;
1170}
1171EXPORT_SYMBOL(inet_register_protosw);
1172
1173void inet_unregister_protosw(struct inet_protosw *p)
1174{
1175        if (INET_PROTOSW_PERMANENT & p->flags) {
1176                pr_err("Attempt to unregister permanent protocol %d\n",
1177                       p->protocol);
1178        } else {
1179                spin_lock_bh(&inetsw_lock);
1180                list_del_rcu(&p->list);
1181                spin_unlock_bh(&inetsw_lock);
1182
1183                synchronize_net();
1184        }
1185}
1186EXPORT_SYMBOL(inet_unregister_protosw);
1187
1188static int inet_sk_reselect_saddr(struct sock *sk)
1189{
1190        struct inet_sock *inet = inet_sk(sk);
1191        __be32 old_saddr = inet->inet_saddr;
1192        __be32 daddr = inet->inet_daddr;
1193        struct flowi4 *fl4;
1194        struct rtable *rt;
1195        __be32 new_saddr;
1196        struct ip_options_rcu *inet_opt;
1197
1198        inet_opt = rcu_dereference_protected(inet->inet_opt,
1199                                             lockdep_sock_is_held(sk));
1200        if (inet_opt && inet_opt->opt.srr)
1201                daddr = inet_opt->opt.faddr;
1202
1203        /* Query new route. */
1204        fl4 = &inet->cork.fl.u.ip4;
1205        rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk),
1206                              sk->sk_bound_dev_if, sk->sk_protocol,
1207                              inet->inet_sport, inet->inet_dport, sk);
1208        if (IS_ERR(rt))
1209                return PTR_ERR(rt);
1210
1211        sk_setup_caps(sk, &rt->dst);
1212
1213        new_saddr = fl4->saddr;
1214
1215        if (new_saddr == old_saddr)
1216                return 0;
1217
1218        if (sock_net(sk)->ipv4.sysctl_ip_dynaddr > 1) {
1219                pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n",
1220                        __func__, &old_saddr, &new_saddr);
1221        }
1222
1223        inet->inet_saddr = inet->inet_rcv_saddr = new_saddr;
1224
1225        /*
1226         * XXX The only one ugly spot where we need to
1227         * XXX really change the sockets identity after
1228         * XXX it has entered the hashes. -DaveM
1229         *
1230         * Besides that, it does not check for connection
1231         * uniqueness. Wait for troubles.
1232         */
1233        return __sk_prot_rehash(sk);
1234}
1235
1236int inet_sk_rebuild_header(struct sock *sk)
1237{
1238        struct inet_sock *inet = inet_sk(sk);
1239        struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0);
1240        __be32 daddr;
1241        struct ip_options_rcu *inet_opt;
1242        struct flowi4 *fl4;
1243        int err;
1244
1245        /* Route is OK, nothing to do. */
1246        if (rt)
1247                return 0;
1248
1249        /* Reroute. */
1250        rcu_read_lock();
1251        inet_opt = rcu_dereference(inet->inet_opt);
1252        daddr = inet->inet_daddr;
1253        if (inet_opt && inet_opt->opt.srr)
1254                daddr = inet_opt->opt.faddr;
1255        rcu_read_unlock();
1256        fl4 = &inet->cork.fl.u.ip4;
1257        rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr,
1258                                   inet->inet_dport, inet->inet_sport,
1259                                   sk->sk_protocol, RT_CONN_FLAGS(sk),
1260                                   sk->sk_bound_dev_if);
1261        if (!IS_ERR(rt)) {
1262                err = 0;
1263                sk_setup_caps(sk, &rt->dst);
1264        } else {
1265                err = PTR_ERR(rt);
1266
1267                /* Routing failed... */
1268                sk->sk_route_caps = 0;
1269                /*
1270                 * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1271                 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1272                 */
1273                if (!sock_net(sk)->ipv4.sysctl_ip_dynaddr ||
1274                    sk->sk_state != TCP_SYN_SENT ||
1275                    (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
1276                    (err = inet_sk_reselect_saddr(sk)) != 0)
1277                        sk->sk_err_soft = -err;
1278        }
1279
1280        return err;
1281}
1282EXPORT_SYMBOL(inet_sk_rebuild_header);
1283
1284void inet_sk_set_state(struct sock *sk, int state)
1285{
1286        trace_inet_sock_set_state(sk, sk->sk_state, state);
1287        sk->sk_state = state;
1288}
1289EXPORT_SYMBOL(inet_sk_set_state);
1290
1291void inet_sk_state_store(struct sock *sk, int newstate)
1292{
1293        trace_inet_sock_set_state(sk, sk->sk_state, newstate);
1294        smp_store_release(&sk->sk_state, newstate);
1295}
1296
1297struct sk_buff *inet_gso_segment(struct sk_buff *skb,
1298                                 netdev_features_t features)
1299{
1300        bool udpfrag = false, fixedid = false, gso_partial, encap;
1301        struct sk_buff *segs = ERR_PTR(-EINVAL);
1302        const struct net_offload *ops;
1303        unsigned int offset = 0;
1304        struct iphdr *iph;
1305        int proto, tot_len;
1306        int nhoff;
1307        int ihl;
1308        int id;
1309
1310        skb_reset_network_header(skb);
1311        nhoff = skb_network_header(skb) - skb_mac_header(skb);
1312        if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1313                goto out;
1314
1315        iph = ip_hdr(skb);
1316        ihl = iph->ihl * 4;
1317        if (ihl < sizeof(*iph))
1318                goto out;
1319
1320        id = ntohs(iph->id);
1321        proto = iph->protocol;
1322
1323        /* Warning: after this point, iph might be no longer valid */
1324        if (unlikely(!pskb_may_pull(skb, ihl)))
1325                goto out;
1326        __skb_pull(skb, ihl);
1327
1328        encap = SKB_GSO_CB(skb)->encap_level > 0;
1329        if (encap)
1330                features &= skb->dev->hw_enc_features;
1331        SKB_GSO_CB(skb)->encap_level += ihl;
1332
1333        skb_reset_transport_header(skb);
1334
1335        segs = ERR_PTR(-EPROTONOSUPPORT);
1336
1337        if (!skb->encapsulation || encap) {
1338                udpfrag = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP);
1339                fixedid = !!(skb_shinfo(skb)->gso_type & SKB_GSO_TCP_FIXEDID);
1340
1341                /* fixed ID is invalid if DF bit is not set */
1342                if (fixedid && !(ip_hdr(skb)->frag_off & htons(IP_DF)))
1343                        goto out;
1344        }
1345
1346        ops = rcu_dereference(inet_offloads[proto]);
1347        if (likely(ops && ops->callbacks.gso_segment))
1348                segs = ops->callbacks.gso_segment(skb, features);
1349
1350        if (IS_ERR_OR_NULL(segs))
1351                goto out;
1352
1353        gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL);
1354
1355        skb = segs;
1356        do {
1357                iph = (struct iphdr *)(skb_mac_header(skb) + nhoff);
1358                if (udpfrag) {
1359                        iph->frag_off = htons(offset >> 3);
1360                        if (skb->next)
1361                                iph->frag_off |= htons(IP_MF);
1362                        offset += skb->len - nhoff - ihl;
1363                        tot_len = skb->len - nhoff;
1364                } else if (skb_is_gso(skb)) {
1365                        if (!fixedid) {
1366                                iph->id = htons(id);
1367                                id += skb_shinfo(skb)->gso_segs;
1368                        }
1369
1370                        if (gso_partial)
1371                                tot_len = skb_shinfo(skb)->gso_size +
1372                                          SKB_GSO_CB(skb)->data_offset +
1373                                          skb->head - (unsigned char *)iph;
1374                        else
1375                                tot_len = skb->len - nhoff;
1376                } else {
1377                        if (!fixedid)
1378                                iph->id = htons(id++);
1379                        tot_len = skb->len - nhoff;
1380                }
1381                iph->tot_len = htons(tot_len);
1382                ip_send_check(iph);
1383                if (encap)
1384                        skb_reset_inner_headers(skb);
1385                skb->network_header = (u8 *)iph - skb->head;
1386                skb_reset_mac_len(skb);
1387        } while ((skb = skb->next));
1388
1389out:
1390        return segs;
1391}
1392EXPORT_SYMBOL(inet_gso_segment);
1393
1394static struct sk_buff *ipip_gso_segment(struct sk_buff *skb,
1395                                        netdev_features_t features)
1396{
1397        if (!(skb_shinfo(skb)->gso_type & SKB_GSO_IPXIP4))
1398                return ERR_PTR(-EINVAL);
1399
1400        return inet_gso_segment(skb, features);
1401}
1402
1403INDIRECT_CALLABLE_DECLARE(struct sk_buff *tcp4_gro_receive(struct list_head *,
1404                                                           struct sk_buff *));
1405INDIRECT_CALLABLE_DECLARE(struct sk_buff *udp4_gro_receive(struct list_head *,
1406                                                           struct sk_buff *));
1407struct sk_buff *inet_gro_receive(struct list_head *head, struct sk_buff *skb)
1408{
1409        const struct net_offload *ops;
1410        struct sk_buff *pp = NULL;
1411        const struct iphdr *iph;
1412        struct sk_buff *p;
1413        unsigned int hlen;
1414        unsigned int off;
1415        unsigned int id;
1416        int flush = 1;
1417        int proto;
1418
1419        off = skb_gro_offset(skb);
1420        hlen = off + sizeof(*iph);
1421        iph = skb_gro_header_fast(skb, off);
1422        if (skb_gro_header_hard(skb, hlen)) {
1423                iph = skb_gro_header_slow(skb, hlen, off);
1424                if (unlikely(!iph))
1425                        goto out;
1426        }
1427
1428        proto = iph->protocol;
1429
1430        rcu_read_lock();
1431        ops = rcu_dereference(inet_offloads[proto]);
1432        if (!ops || !ops->callbacks.gro_receive)
1433                goto out_unlock;
1434
1435        if (*(u8 *)iph != 0x45)
1436                goto out_unlock;
1437
1438        if (ip_is_fragment(iph))
1439                goto out_unlock;
1440
1441        if (unlikely(ip_fast_csum((u8 *)iph, 5)))
1442                goto out_unlock;
1443
1444        id = ntohl(*(__be32 *)&iph->id);
1445        flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF));
1446        id >>= 16;
1447
1448        list_for_each_entry(p, head, list) {
1449                struct iphdr *iph2;
1450                u16 flush_id;
1451
1452                if (!NAPI_GRO_CB(p)->same_flow)
1453                        continue;
1454
1455                iph2 = (struct iphdr *)(p->data + off);
1456                /* The above works because, with the exception of the top
1457                 * (inner most) layer, we only aggregate pkts with the same
1458                 * hdr length so all the hdrs we'll need to verify will start
1459                 * at the same offset.
1460                 */
1461                if ((iph->protocol ^ iph2->protocol) |
1462                    ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) |
1463                    ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) {
1464                        NAPI_GRO_CB(p)->same_flow = 0;
1465                        continue;
1466                }
1467
1468                /* All fields must match except length and checksum. */
1469                NAPI_GRO_CB(p)->flush |=
1470                        (iph->ttl ^ iph2->ttl) |
1471                        (iph->tos ^ iph2->tos) |
1472                        ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF));
1473
1474                NAPI_GRO_CB(p)->flush |= flush;
1475
1476                /* We need to store of the IP ID check to be included later
1477                 * when we can verify that this packet does in fact belong
1478                 * to a given flow.
1479                 */
1480                flush_id = (u16)(id - ntohs(iph2->id));
1481
1482                /* This bit of code makes it much easier for us to identify
1483                 * the cases where we are doing atomic vs non-atomic IP ID
1484                 * checks.  Specifically an atomic check can return IP ID
1485                 * values 0 - 0xFFFF, while a non-atomic check can only
1486                 * return 0 or 0xFFFF.
1487                 */
1488                if (!NAPI_GRO_CB(p)->is_atomic ||
1489                    !(iph->frag_off & htons(IP_DF))) {
1490                        flush_id ^= NAPI_GRO_CB(p)->count;
1491                        flush_id = flush_id ? 0xFFFF : 0;
1492                }
1493
1494                /* If the previous IP ID value was based on an atomic
1495                 * datagram we can overwrite the value and ignore it.
1496                 */
1497                if (NAPI_GRO_CB(skb)->is_atomic)
1498                        NAPI_GRO_CB(p)->flush_id = flush_id;
1499                else
1500                        NAPI_GRO_CB(p)->flush_id |= flush_id;
1501        }
1502
1503        NAPI_GRO_CB(skb)->is_atomic = !!(iph->frag_off & htons(IP_DF));
1504        NAPI_GRO_CB(skb)->flush |= flush;
1505        skb_set_network_header(skb, off);
1506        /* The above will be needed by the transport layer if there is one
1507         * immediately following this IP hdr.
1508         */
1509
1510        /* Note : No need to call skb_gro_postpull_rcsum() here,
1511         * as we already checked checksum over ipv4 header was 0
1512         */
1513        skb_gro_pull(skb, sizeof(*iph));
1514        skb_set_transport_header(skb, skb_gro_offset(skb));
1515
1516        pp = indirect_call_gro_receive(tcp4_gro_receive, udp4_gro_receive,
1517                                       ops->callbacks.gro_receive, head, skb);
1518
1519out_unlock:
1520        rcu_read_unlock();
1521
1522out:
1523        skb_gro_flush_final(skb, pp, flush);
1524
1525        return pp;
1526}
1527EXPORT_SYMBOL(inet_gro_receive);
1528
1529static struct sk_buff *ipip_gro_receive(struct list_head *head,
1530                                        struct sk_buff *skb)
1531{
1532        if (NAPI_GRO_CB(skb)->encap_mark) {
1533                NAPI_GRO_CB(skb)->flush = 1;
1534                return NULL;
1535        }
1536
1537        NAPI_GRO_CB(skb)->encap_mark = 1;
1538
1539        return inet_gro_receive(head, skb);
1540}
1541
1542#define SECONDS_PER_DAY 86400
1543
1544/* inet_current_timestamp - Return IP network timestamp
1545 *
1546 * Return milliseconds since midnight in network byte order.
1547 */
1548__be32 inet_current_timestamp(void)
1549{
1550        u32 secs;
1551        u32 msecs;
1552        struct timespec64 ts;
1553
1554        ktime_get_real_ts64(&ts);
1555
1556        /* Get secs since midnight. */
1557        (void)div_u64_rem(ts.tv_sec, SECONDS_PER_DAY, &secs);
1558        /* Convert to msecs. */
1559        msecs = secs * MSEC_PER_SEC;
1560        /* Convert nsec to msec. */
1561        msecs += (u32)ts.tv_nsec / NSEC_PER_MSEC;
1562
1563        /* Convert to network byte order. */
1564        return htonl(msecs);
1565}
1566EXPORT_SYMBOL(inet_current_timestamp);
1567
1568int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
1569{
1570        if (sk->sk_family == AF_INET)
1571                return ip_recv_error(sk, msg, len, addr_len);
1572#if IS_ENABLED(CONFIG_IPV6)
1573        if (sk->sk_family == AF_INET6)
1574                return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len);
1575#endif
1576        return -EINVAL;
1577}
1578
1579INDIRECT_CALLABLE_DECLARE(int tcp4_gro_complete(struct sk_buff *, int));
1580INDIRECT_CALLABLE_DECLARE(int udp4_gro_complete(struct sk_buff *, int));
1581int inet_gro_complete(struct sk_buff *skb, int nhoff)
1582{
1583        __be16 newlen = htons(skb->len - nhoff);
1584        struct iphdr *iph = (struct iphdr *)(skb->data + nhoff);
1585        const struct net_offload *ops;
1586        int proto = iph->protocol;
1587        int err = -ENOSYS;
1588
1589        if (skb->encapsulation) {
1590                skb_set_inner_protocol(skb, cpu_to_be16(ETH_P_IP));
1591                skb_set_inner_network_header(skb, nhoff);
1592        }
1593
1594        csum_replace2(&iph->check, iph->tot_len, newlen);
1595        iph->tot_len = newlen;
1596
1597        rcu_read_lock();
1598        ops = rcu_dereference(inet_offloads[proto]);
1599        if (WARN_ON(!ops || !ops->callbacks.gro_complete))
1600                goto out_unlock;
1601
1602        /* Only need to add sizeof(*iph) to get to the next hdr below
1603         * because any hdr with option will have been flushed in
1604         * inet_gro_receive().
1605         */
1606        err = INDIRECT_CALL_2(ops->callbacks.gro_complete,
1607                              tcp4_gro_complete, udp4_gro_complete,
1608                              skb, nhoff + sizeof(*iph));
1609
1610out_unlock:
1611        rcu_read_unlock();
1612
1613        return err;
1614}
1615EXPORT_SYMBOL(inet_gro_complete);
1616
1617static int ipip_gro_complete(struct sk_buff *skb, int nhoff)
1618{
1619        skb->encapsulation = 1;
1620        skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4;
1621        return inet_gro_complete(skb, nhoff);
1622}
1623
1624int inet_ctl_sock_create(struct sock **sk, unsigned short family,
1625                         unsigned short type, unsigned char protocol,
1626                         struct net *net)
1627{
1628        struct socket *sock;
1629        int rc = sock_create_kern(net, family, type, protocol, &sock);
1630
1631        if (rc == 0) {
1632                *sk = sock->sk;
1633                (*sk)->sk_allocation = GFP_ATOMIC;
1634                /*
1635                 * Unhash it so that IP input processing does not even see it,
1636                 * we do not wish this socket to see incoming packets.
1637                 */
1638                (*sk)->sk_prot->unhash(*sk);
1639        }
1640        return rc;
1641}
1642EXPORT_SYMBOL_GPL(inet_ctl_sock_create);
1643
1644u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offt)
1645{
1646        return  *(((unsigned long *)per_cpu_ptr(mib, cpu)) + offt);
1647}
1648EXPORT_SYMBOL_GPL(snmp_get_cpu_field);
1649
1650unsigned long snmp_fold_field(void __percpu *mib, int offt)
1651{
1652        unsigned long res = 0;
1653        int i;
1654
1655        for_each_possible_cpu(i)
1656                res += snmp_get_cpu_field(mib, i, offt);
1657        return res;
1658}
1659EXPORT_SYMBOL_GPL(snmp_fold_field);
1660
1661#if BITS_PER_LONG==32
1662
1663u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offt,
1664                         size_t syncp_offset)
1665{
1666        void *bhptr;
1667        struct u64_stats_sync *syncp;
1668        u64 v;
1669        unsigned int start;
1670
1671        bhptr = per_cpu_ptr(mib, cpu);
1672        syncp = (struct u64_stats_sync *)(bhptr + syncp_offset);
1673        do {
1674                start = u64_stats_fetch_begin_irq(syncp);
1675                v = *(((u64 *)bhptr) + offt);
1676        } while (u64_stats_fetch_retry_irq(syncp, start));
1677
1678        return v;
1679}
1680EXPORT_SYMBOL_GPL(snmp_get_cpu_field64);
1681
1682u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset)
1683{
1684        u64 res = 0;
1685        int cpu;
1686
1687        for_each_possible_cpu(cpu) {
1688                res += snmp_get_cpu_field64(mib, cpu, offt, syncp_offset);
1689        }
1690        return res;
1691}
1692EXPORT_SYMBOL_GPL(snmp_fold_field64);
1693#endif
1694
1695#ifdef CONFIG_IP_MULTICAST
1696static const struct net_protocol igmp_protocol = {
1697        .handler =      igmp_rcv,
1698        .netns_ok =     1,
1699};
1700#endif
1701
1702/* thinking of making this const? Don't.
1703 * early_demux can change based on sysctl.
1704 */
1705static struct net_protocol tcp_protocol = {
1706        .early_demux    =       tcp_v4_early_demux,
1707        .early_demux_handler =  tcp_v4_early_demux,
1708        .handler        =       tcp_v4_rcv,
1709        .err_handler    =       tcp_v4_err,
1710        .no_policy      =       1,
1711        .netns_ok       =       1,
1712        .icmp_strict_tag_validation = 1,
1713};
1714
1715/* thinking of making this const? Don't.
1716 * early_demux can change based on sysctl.
1717 */
1718static struct net_protocol udp_protocol = {
1719        .early_demux =  udp_v4_early_demux,
1720        .early_demux_handler =  udp_v4_early_demux,
1721        .handler =      udp_rcv,
1722        .err_handler =  udp_err,
1723        .no_policy =    1,
1724        .netns_ok =     1,
1725};
1726
1727static const struct net_protocol icmp_protocol = {
1728        .handler =      icmp_rcv,
1729        .err_handler =  icmp_err,
1730        .no_policy =    1,
1731        .netns_ok =     1,
1732};
1733
1734static __net_init int ipv4_mib_init_net(struct net *net)
1735{
1736        int i;
1737
1738        net->mib.tcp_statistics = alloc_percpu(struct tcp_mib);
1739        if (!net->mib.tcp_statistics)
1740                goto err_tcp_mib;
1741        net->mib.ip_statistics = alloc_percpu(struct ipstats_mib);
1742        if (!net->mib.ip_statistics)
1743                goto err_ip_mib;
1744
1745        for_each_possible_cpu(i) {
1746                struct ipstats_mib *af_inet_stats;
1747                af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i);
1748                u64_stats_init(&af_inet_stats->syncp);
1749        }
1750
1751        net->mib.net_statistics = alloc_percpu(struct linux_mib);
1752        if (!net->mib.net_statistics)
1753                goto err_net_mib;
1754        net->mib.udp_statistics = alloc_percpu(struct udp_mib);
1755        if (!net->mib.udp_statistics)
1756                goto err_udp_mib;
1757        net->mib.udplite_statistics = alloc_percpu(struct udp_mib);
1758        if (!net->mib.udplite_statistics)
1759                goto err_udplite_mib;
1760        net->mib.icmp_statistics = alloc_percpu(struct icmp_mib);
1761        if (!net->mib.icmp_statistics)
1762                goto err_icmp_mib;
1763        net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib),
1764                                              GFP_KERNEL);
1765        if (!net->mib.icmpmsg_statistics)
1766                goto err_icmpmsg_mib;
1767
1768        tcp_mib_init(net);
1769        return 0;
1770
1771err_icmpmsg_mib:
1772        free_percpu(net->mib.icmp_statistics);
1773err_icmp_mib:
1774        free_percpu(net->mib.udplite_statistics);
1775err_udplite_mib:
1776        free_percpu(net->mib.udp_statistics);
1777err_udp_mib:
1778        free_percpu(net->mib.net_statistics);
1779err_net_mib:
1780        free_percpu(net->mib.ip_statistics);
1781err_ip_mib:
1782        free_percpu(net->mib.tcp_statistics);
1783err_tcp_mib:
1784        return -ENOMEM;
1785}
1786
1787static __net_exit void ipv4_mib_exit_net(struct net *net)
1788{
1789        kfree(net->mib.icmpmsg_statistics);
1790        free_percpu(net->mib.icmp_statistics);
1791        free_percpu(net->mib.udplite_statistics);
1792        free_percpu(net->mib.udp_statistics);
1793        free_percpu(net->mib.net_statistics);
1794        free_percpu(net->mib.ip_statistics);
1795        free_percpu(net->mib.tcp_statistics);
1796}
1797
1798static __net_initdata struct pernet_operations ipv4_mib_ops = {
1799        .init = ipv4_mib_init_net,
1800        .exit = ipv4_mib_exit_net,
1801};
1802
1803static int __init init_ipv4_mibs(void)
1804{
1805        return register_pernet_subsys(&ipv4_mib_ops);
1806}
1807
1808static __net_init int inet_init_net(struct net *net)
1809{
1810        /*
1811         * Set defaults for local port range
1812         */
1813        seqlock_init(&net->ipv4.ip_local_ports.lock);
1814        net->ipv4.ip_local_ports.range[0] =  32768;
1815        net->ipv4.ip_local_ports.range[1] =  60999;
1816
1817        seqlock_init(&net->ipv4.ping_group_range.lock);
1818        /*
1819         * Sane defaults - nobody may create ping sockets.
1820         * Boot scripts should set this to distro-specific group.
1821         */
1822        net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1);
1823        net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0);
1824
1825        /* Default values for sysctl-controlled parameters.
1826         * We set them here, in case sysctl is not compiled.
1827         */
1828        net->ipv4.sysctl_ip_default_ttl = IPDEFTTL;
1829        net->ipv4.sysctl_ip_fwd_update_priority = 1;
1830        net->ipv4.sysctl_ip_dynaddr = 0;
1831        net->ipv4.sysctl_ip_early_demux = 1;
1832        net->ipv4.sysctl_udp_early_demux = 1;
1833        net->ipv4.sysctl_tcp_early_demux = 1;
1834#ifdef CONFIG_SYSCTL
1835        net->ipv4.sysctl_ip_prot_sock = PROT_SOCK;
1836#endif
1837
1838        /* Some igmp sysctl, whose values are always used */
1839        net->ipv4.sysctl_igmp_max_memberships = 20;
1840        net->ipv4.sysctl_igmp_max_msf = 10;
1841        /* IGMP reports for link-local multicast groups are enabled by default */
1842        net->ipv4.sysctl_igmp_llm_reports = 1;
1843        net->ipv4.sysctl_igmp_qrv = 2;
1844
1845        return 0;
1846}
1847
1848static __net_initdata struct pernet_operations af_inet_ops = {
1849        .init = inet_init_net,
1850};
1851
1852static int __init init_inet_pernet_ops(void)
1853{
1854        return register_pernet_subsys(&af_inet_ops);
1855}
1856
1857static int ipv4_proc_init(void);
1858
1859/*
1860 *      IP protocol layer initialiser
1861 */
1862
1863static struct packet_offload ip_packet_offload __read_mostly = {
1864        .type = cpu_to_be16(ETH_P_IP),
1865        .callbacks = {
1866                .gso_segment = inet_gso_segment,
1867                .gro_receive = inet_gro_receive,
1868                .gro_complete = inet_gro_complete,
1869        },
1870};
1871
1872static const struct net_offload ipip_offload = {
1873        .callbacks = {
1874                .gso_segment    = ipip_gso_segment,
1875                .gro_receive    = ipip_gro_receive,
1876                .gro_complete   = ipip_gro_complete,
1877        },
1878};
1879
1880static int __init ipip_offload_init(void)
1881{
1882        return inet_add_offload(&ipip_offload, IPPROTO_IPIP);
1883}
1884
1885static int __init ipv4_offload_init(void)
1886{
1887        /*
1888         * Add offloads
1889         */
1890        if (udpv4_offload_init() < 0)
1891                pr_crit("%s: Cannot add UDP protocol offload\n", __func__);
1892        if (tcpv4_offload_init() < 0)
1893                pr_crit("%s: Cannot add TCP protocol offload\n", __func__);
1894        if (ipip_offload_init() < 0)
1895                pr_crit("%s: Cannot add IPIP protocol offload\n", __func__);
1896
1897        dev_add_offload(&ip_packet_offload);
1898        return 0;
1899}
1900
1901fs_initcall(ipv4_offload_init);
1902
1903static struct packet_type ip_packet_type __read_mostly = {
1904        .type = cpu_to_be16(ETH_P_IP),
1905        .func = ip_rcv,
1906        .list_func = ip_list_rcv,
1907};
1908
1909static int __init inet_init(void)
1910{
1911        struct inet_protosw *q;
1912        struct list_head *r;
1913        int rc = -EINVAL;
1914
1915        sock_skb_cb_check_size(sizeof(struct inet_skb_parm));
1916
1917        rc = proto_register(&tcp_prot, 1);
1918        if (rc)
1919                goto out;
1920
1921        rc = proto_register(&udp_prot, 1);
1922        if (rc)
1923                goto out_unregister_tcp_proto;
1924
1925        rc = proto_register(&raw_prot, 1);
1926        if (rc)
1927                goto out_unregister_udp_proto;
1928
1929        rc = proto_register(&ping_prot, 1);
1930        if (rc)
1931                goto out_unregister_raw_proto;
1932
1933        /*
1934         *      Tell SOCKET that we are alive...
1935         */
1936
1937        (void)sock_register(&inet_family_ops);
1938
1939#ifdef CONFIG_SYSCTL
1940        ip_static_sysctl_init();
1941#endif
1942
1943        /*
1944         *      Add all the base protocols.
1945         */
1946
1947        if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
1948                pr_crit("%s: Cannot add ICMP protocol\n", __func__);
1949        if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0)
1950                pr_crit("%s: Cannot add UDP protocol\n", __func__);
1951        if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0)
1952                pr_crit("%s: Cannot add TCP protocol\n", __func__);
1953#ifdef CONFIG_IP_MULTICAST
1954        if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
1955                pr_crit("%s: Cannot add IGMP protocol\n", __func__);
1956#endif
1957
1958        /* Register the socket-side information for inet_create. */
1959        for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
1960                INIT_LIST_HEAD(r);
1961
1962        for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
1963                inet_register_protosw(q);
1964
1965        /*
1966         *      Set the ARP module up
1967         */
1968
1969        arp_init();
1970
1971        /*
1972         *      Set the IP module up
1973         */
1974
1975        ip_init();
1976
1977        /* Setup TCP slab cache for open requests. */
1978        tcp_init();
1979
1980        /* Setup UDP memory threshold */
1981        udp_init();
1982
1983        /* Add UDP-Lite (RFC 3828) */
1984        udplite4_register();
1985
1986        raw_init();
1987
1988        ping_init();
1989
1990        /*
1991         *      Set the ICMP layer up
1992         */
1993
1994        if (icmp_init() < 0)
1995                panic("Failed to create the ICMP control socket.\n");
1996
1997        /*
1998         *      Initialise the multicast router
1999         */
2000#if defined(CONFIG_IP_MROUTE)
2001        if (ip_mr_init())
2002                pr_crit("%s: Cannot init ipv4 mroute\n", __func__);
2003#endif
2004
2005        if (init_inet_pernet_ops())
2006                pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__);
2007        /*
2008         *      Initialise per-cpu ipv4 mibs
2009         */
2010
2011        if (init_ipv4_mibs())
2012                pr_crit("%s: Cannot init ipv4 mibs\n", __func__);
2013
2014        ipv4_proc_init();
2015
2016        ipfrag_init();
2017
2018        dev_add_pack(&ip_packet_type);
2019
2020        ip_tunnel_core_init();
2021
2022        rc = 0;
2023out:
2024        return rc;
2025out_unregister_raw_proto:
2026        proto_unregister(&raw_prot);
2027out_unregister_udp_proto:
2028        proto_unregister(&udp_prot);
2029out_unregister_tcp_proto:
2030        proto_unregister(&tcp_prot);
2031        goto out;
2032}
2033
2034fs_initcall(inet_init);
2035
2036/* ------------------------------------------------------------------------ */
2037
2038#ifdef CONFIG_PROC_FS
2039static int __init ipv4_proc_init(void)
2040{
2041        int rc = 0;
2042
2043        if (raw_proc_init())
2044                goto out_raw;
2045        if (tcp4_proc_init())
2046                goto out_tcp;
2047        if (udp4_proc_init())
2048                goto out_udp;
2049        if (ping_proc_init())
2050                goto out_ping;
2051        if (ip_misc_proc_init())
2052                goto out_misc;
2053out:
2054        return rc;
2055out_misc:
2056        ping_proc_exit();
2057out_ping:
2058        udp4_proc_exit();
2059out_udp:
2060        tcp4_proc_exit();
2061out_tcp:
2062        raw_proc_exit();
2063out_raw:
2064        rc = -ENOMEM;
2065        goto out;
2066}
2067
2068#else /* CONFIG_PROC_FS */
2069static int __init ipv4_proc_init(void)
2070{
2071        return 0;
2072}
2073#endif /* CONFIG_PROC_FS */
2074