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         if (sk->sk_rx_skb_cache) {
 140                 __kfree_skb(sk->sk_rx_skb_cache);
 141                 sk->sk_rx_skb_cache = NULL;
 142         }
 143         __skb_queue_purge(&sk->sk_error_queue);
 144
 145         sk_mem_reclaim(sk);
 146
 147         if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) {
 148                 pr_err("Attempt to release TCP socket in state %d %p\n",
 149                        sk->sk_state, sk);
 150                 return;
 151         }
 152         if (!sock_flag(sk, SOCK_DEAD)) {
 153                 pr_err("Attempt to release alive inet socket %p\n", sk);
 154                 return;
 155         }
 156
 157         WARN_ON(atomic_read(&sk->sk_rmem_alloc));
 158         WARN_ON(refcount_read(&sk->sk_wmem_alloc));
 159         WARN_ON(sk->sk_wmem_queued);
 160         WARN_ON(sk->sk_forward_alloc);
 161
 162         kfree(rcu_dereference_protected(inet->inet_opt, 1));
 163         dst_release(rcu_dereference_check(sk->sk_dst_cache, 1));
 164         dst_release(sk->sk_rx_dst);
 165         sk_refcnt_debug_dec(sk);
 166 }
 167 EXPORT_SYMBOL(inet_sock_destruct);
 168
 169 /*
 170  *      The routines beyond this point handle the behaviour of an AF_INET
 171  *      socket object. Mostly it punts to the subprotocols of IP to do
 172  *      the work.
 173  */
 174
 175 /*
 176  *      Automatically bind an unbound socket.
 177  */
 178
 179 static int inet_autobind(struct sock *sk)
 180 {
 181         struct inet_sock *inet;
 182         /* We may need to bind the socket. */
 183         lock_sock(sk);
 184         inet = inet_sk(sk);
 185         if (!inet->inet_num) {
 186                 if (sk->sk_prot->get_port(sk, 0)) {
 187                         release_sock(sk);
 188                         return -EAGAIN;
 189                 }
 190                 inet->inet_sport = htons(inet->inet_num);
 191         }
 192         release_sock(sk);
 193         return 0;
 194 }
 195
 196 /*
 197  *      Move a socket into listening state.
 198  */
 199 int inet_listen(struct socket *sock, int backlog)
 200 {
 201         struct sock *sk = sock->sk;
 202         unsigned char old_state;
 203         int err, tcp_fastopen;
 204
 205         lock_sock(sk);
 206
 207         err = -EINVAL;
 208         if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM)
 209                 goto out;
 210
 211         old_state = sk->sk_state;
 212         if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN)))
 213                 goto out;
 214
 215         sk->sk_max_ack_backlog = backlog;
 216         /* Really, if the socket is already in listen state
 217          * we can only allow the backlog to be adjusted.
 218          */
 219         if (old_state != TCP_LISTEN) {
 220                 /* Enable TFO w/o requiring TCP_FASTOPEN socket option.
 221                  * Note that only TCP sockets (SOCK_STREAM) will reach here.
 222                  * Also fastopen backlog may already been set via the option
 223                  * because the socket was in TCP_LISTEN state previously but
 224                  * was shutdown() rather than close().
 225                  */
 226                 tcp_fastopen = sock_net(sk)->ipv4.sysctl_tcp_fastopen;
 227                 if ((tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) &&
 228                     (tcp_fastopen & TFO_SERVER_ENABLE) &&
 229                     !inet_csk(sk)->icsk_accept_queue.fastopenq.max_qlen) {
 230                         fastopen_queue_tune(sk, backlog);
 231                         tcp_fastopen_init_key_once(sock_net(sk));
 232                 }
 233
 234                 err = inet_csk_listen_start(sk, backlog);
 235                 if (err)
 236                         goto out;
 237                 tcp_call_bpf(sk, BPF_SOCK_OPS_TCP_LISTEN_CB, 0, NULL);
 238         }
 239         err = 0;
 240
 241 out:
 242         release_sock(sk);
 243         return err;
 244 }
 245 EXPORT_SYMBOL(inet_listen);
 246
 247 /*
 248  *      Create an inet socket.
 249  */
 250
 251 static int inet_create(struct net *net, struct socket *sock, int protocol,
 252                        int kern)
 253 {
 254         struct sock *sk;
 255         struct inet_protosw *answer;
 256         struct inet_sock *inet;
 257         struct proto *answer_prot;
 258         unsigned char answer_flags;
 259         int try_loading_module = 0;
 260         int err;
 261
 262         if (protocol < 0 || protocol >= IPPROTO_MAX)
 263                 return -EINVAL;
 264
 265         sock->state = SS_UNCONNECTED;
 266
 267         /* Look for the requested type/protocol pair. */
 268 lookup_protocol:
 269         err = -ESOCKTNOSUPPORT;
 270         rcu_read_lock();
 271         list_for_each_entry_rcu(answer, &inetsw[sock->type], list) {
 272
 273                 err = 0;
 274                 /* Check the non-wild match. */
 275                 if (protocol == answer->protocol) {
 276                         if (protocol != IPPROTO_IP)
 277                                 break;
 278                 } else {
 279                         /* Check for the two wild cases. */
 280                         if (IPPROTO_IP == protocol) {
 281                                 protocol = answer->protocol;
 282                                 break;
 283                         }
 284                         if (IPPROTO_IP == answer->protocol)
 285                                 break;
 286                 }
 287                 err = -EPROTONOSUPPORT;
 288         }
 289
 290         if (unlikely(err)) {
 291                 if (try_loading_module < 2) {
 292                         rcu_read_unlock();
 293                         /*
 294                          * Be more specific, e.g. net-pf-2-proto-132-type-1
 295                          * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
 296                          */
 297                         if (++try_loading_module == 1)
 298                                 request_module("net-pf-%d-proto-%d-type-%d",
 299                                                PF_INET, protocol, sock->type);
 300                         /*
 301                          * Fall back to generic, e.g. net-pf-2-proto-132
 302                          * (net-pf-PF_INET-proto-IPPROTO_SCTP)
 303                          */
 304                         else
 305                                 request_module("net-pf-%d-proto-%d",
 306                                                PF_INET, protocol);
 307                         goto lookup_protocol;
 308                 } else
 309                         goto out_rcu_unlock;
 310         }
 311
 312         err = -EPERM;
 313         if (sock->type == SOCK_RAW && !kern &&
 314             !ns_capable(net->user_ns, CAP_NET_RAW))
 315                 goto out_rcu_unlock;
 316
 317         sock->ops = answer->ops;
 318         answer_prot = answer->prot;
 319         answer_flags = answer->flags;
 320         rcu_read_unlock();
 321
 322         WARN_ON(!answer_prot->slab);
 323
 324         err = -ENOBUFS;
 325         sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot, kern);
 326         if (!sk)
 327                 goto out;
 328
 329         err = 0;
 330         if (INET_PROTOSW_REUSE & answer_flags)
 331                 sk->sk_reuse = SK_CAN_REUSE;
 332
 333         inet = inet_sk(sk);
 334         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
 335
 336         inet->nodefrag = 0;
 337
 338         if (SOCK_RAW == sock->type) {
 339                 inet->inet_num = protocol;
 340                 if (IPPROTO_RAW == protocol)
 341                         inet->hdrincl = 1;
 342         }
 343
 344         if (net->ipv4.sysctl_ip_no_pmtu_disc)
 345                 inet->pmtudisc = IP_PMTUDISC_DONT;
 346         else
 347                 inet->pmtudisc = IP_PMTUDISC_WANT;
 348
 349         inet->inet_id = 0;
 350
 351         sock_init_data(sock, sk);
 352
 353         sk->sk_destruct    = inet_sock_destruct;
 354         sk->sk_protocol    = protocol;
 355         sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
 356
 357         inet->uc_ttl    = -1;
 358         inet->mc_loop   = 1;
 359         inet->mc_ttl    = 1;
 360         inet->mc_all    = 1;
 361         inet->mc_index  = 0;
 362         inet->mc_list   = NULL;
 363         inet->rcv_tos   = 0;
 364
 365         sk_refcnt_debug_inc(sk);
 366
 367         if (inet->inet_num) {
 368                 /* It assumes that any protocol which allows
 369                  * the user to assign a number at socket
 370                  * creation time automatically
 371                  * shares.
 372                  */
 373                 inet->inet_sport = htons(inet->inet_num);
 374                 /* Add to protocol hash chains. */
 375                 err = sk->sk_prot->hash(sk);
 376                 if (err) {
 377                         sk_common_release(sk);
 378                         goto out;
 379                 }
 380         }
 381
 382         if (sk->sk_prot->init) {
 383                 err = sk->sk_prot->init(sk);
 384                 if (err) {
 385                         sk_common_release(sk);
 386                         goto out;
 387                 }
 388         }
 389
 390         if (!kern) {
 391                 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
 392                 if (err) {
 393                         sk_common_release(sk);
 394                         goto out;
 395                 }
 396         }
 397 out:
 398         return err;
 399 out_rcu_unlock:
 400         rcu_read_unlock();
 401         goto out;
 402 }
 403
 404
 405 /*
 406  *      The peer socket should always be NULL (or else). When we call this
 407  *      function we are destroying the object and from then on nobody
 408  *      should refer to it.
 409  */
 410 int inet_release(struct socket *sock)
 411 {
 412         struct sock *sk = sock->sk;
 413
 414         if (sk) {
 415                 long timeout;
 416
 417                 /* Applications forget to leave groups before exiting */
 418                 ip_mc_drop_socket(sk);
 419
 420                 /* If linger is set, we don't return until the close
 421                  * is complete.  Otherwise we return immediately. The
 422                  * actually closing is done the same either way.
 423                  *
 424                  * If the close is due to the process exiting, we never
 425                  * linger..
 426                  */
 427                 timeout = 0;
 428                 if (sock_flag(sk, SOCK_LINGER) &&
 429                     !(current->flags & PF_EXITING))
 430                         timeout = sk->sk_lingertime;
 431                 sock->sk = NULL;
 432                 sk->sk_prot->close(sk, timeout);
 433         }
 434         return 0;
 435 }
 436 EXPORT_SYMBOL(inet_release);
 437
 438 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 439 {
 440         struct sock *sk = sock->sk;
 441         int err;
 442
 443         /* If the socket has its own bind function then use it. (RAW) */
 444         if (sk->sk_prot->bind) {
 445                 return sk->sk_prot->bind(sk, uaddr, addr_len);
 446         }
 447         if (addr_len < sizeof(struct sockaddr_in))
 448                 return -EINVAL;
 449
 450         /* BPF prog is run before any checks are done so that if the prog
 451          * changes context in a wrong way it will be caught.
 452          */
 453         err = BPF_CGROUP_RUN_PROG_INET4_BIND(sk, uaddr);
 454         if (err)
 455                 return err;
 456
 457         return __inet_bind(sk, uaddr, addr_len, false, true);
 458 }
 459 EXPORT_SYMBOL(inet_bind);
 460
 461 int __inet_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
 462                 bool force_bind_address_no_port, bool with_lock)
 463 {
 464         struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
 465         struct inet_sock *inet = inet_sk(sk);
 466         struct net *net = sock_net(sk);
 467         unsigned short snum;
 468         int chk_addr_ret;
 469         u32 tb_id = RT_TABLE_LOCAL;
 470         int err;
 471
 472         if (addr->sin_family != AF_INET) {
 473                 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET)
 474                  * only if s_addr is INADDR_ANY.
 475                  */
 476                 err = -EAFNOSUPPORT;
 477                 if (addr->sin_family != AF_UNSPEC ||
 478                     addr->sin_addr.s_addr != htonl(INADDR_ANY))
 479                         goto out;
 480         }
 481
 482         tb_id = l3mdev_fib_table_by_index(net, sk->sk_bound_dev_if) ? : tb_id;
 483         chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id);
 484
 485         /* Not specified by any standard per-se, however it breaks too
 486          * many applications when removed.  It is unfortunate since
 487          * allowing applications to make a non-local bind solves
 488          * several problems with systems using dynamic addressing.
 489          * (ie. your servers still start up even if your ISDN link
 490          *  is temporarily down)
 491          */
 492         err = -EADDRNOTAVAIL;
 493         if (!inet_can_nonlocal_bind(net, inet) &&
 494             addr->sin_addr.s_addr != htonl(INADDR_ANY) &&
 495             chk_addr_ret != RTN_LOCAL &&
 496             chk_addr_ret != RTN_MULTICAST &&
 497             chk_addr_ret != RTN_BROADCAST)
 498                 goto out;
 499
 500         snum = ntohs(addr->sin_port);
 501         err = -EACCES;
 502         if (snum && snum < inet_prot_sock(net) &&
 503             !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
 504                 goto out;
 505
 506         /*      We keep a pair of addresses. rcv_saddr is the one
 507          *      used by hash lookups, and saddr is used for transmit.
 508          *
 509          *      In the BSD API these are the same except where it
 510          *      would be illegal to use them (multicast/broadcast) in
 511          *      which case the sending device address is used.
 512          */
 513         if (with_lock)
 514                 lock_sock(sk);
 515
 516         /* Check these errors (active socket, double bind). */
 517         err = -EINVAL;
 518         if (sk->sk_state != TCP_CLOSE || inet->inet_num)
 519                 goto out_release_sock;
 520
 521         inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
 522         if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
 523                 inet->inet_saddr = 0;  /* Use device */
 524
 525         /* Make sure we are allowed to bind here. */
 526         if (snum || !(inet->bind_address_no_port ||
 527                       force_bind_address_no_port)) {
 528                 if (sk->sk_prot->get_port(sk, snum)) {
 529                         inet->inet_saddr = inet->inet_rcv_saddr = 0;
 530                         err = -EADDRINUSE;
 531                         goto out_release_sock;
 532                 }
 533                 err = BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk);
 534                 if (err) {
 535                         inet->inet_saddr = inet->inet_rcv_saddr = 0;
 536                         goto out_release_sock;
 537                 }
 538         }
 539
 540         if (inet->inet_rcv_saddr)
 541                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
 542         if (snum)
 543                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
 544         inet->inet_sport = htons(inet->inet_num);
 545         inet->inet_daddr = 0;
 546         inet->inet_dport = 0;
 547         sk_dst_reset(sk);
 548         err = 0;
 549 out_release_sock:
 550         if (with_lock)
 551                 release_sock(sk);
 552 out:
 553         return err;
 554 }
 555
 556 int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr,
 557                        int addr_len, int flags)
 558 {
 559         struct sock *sk = sock->sk;
 560         int err;
 561
 562         if (addr_len < sizeof(uaddr->sa_family))
 563                 return -EINVAL;
 564         if (uaddr->sa_family == AF_UNSPEC)
 565                 return sk->sk_prot->disconnect(sk, flags);
 566
 567         if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) {
 568                 err = sk->sk_prot->pre_connect(sk, uaddr, addr_len);
 569                 if (err)
 570                         return err;
 571         }
 572
 573         if (!inet_sk(sk)->inet_num && inet_autobind(sk))
 574                 return -EAGAIN;
 575         return sk->sk_prot->connect(sk, uaddr, addr_len);
 576 }
 577 EXPORT_SYMBOL(inet_dgram_connect);
 578
 579 static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias)
 580 {
 581         DEFINE_WAIT_FUNC(wait, woken_wake_function);
 582
 583         add_wait_queue(sk_sleep(sk), &wait);
 584         sk->sk_write_pending += writebias;
 585
 586         /* Basic assumption: if someone sets sk->sk_err, he _must_
 587          * change state of the socket from TCP_SYN_*.
 588          * Connect() does not allow to get error notifications
 589          * without closing the socket.
 590          */
 591         while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
 592                 release_sock(sk);
 593                 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
 594                 lock_sock(sk);
 595                 if (signal_pending(current) || !timeo)
 596                         break;
 597         }
 598         remove_wait_queue(sk_sleep(sk), &wait);
 599         sk->sk_write_pending -= writebias;
 600         return timeo;
 601 }
 602
 603 /*
 604  *      Connect to a remote host. There is regrettably still a little
 605  *      TCP 'magic' in here.
 606  */
 607 int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
 608                           int addr_len, int flags, int is_sendmsg)
 609 {
 610         struct sock *sk = sock->sk;
 611         int err;
 612         long timeo;
 613
 614         /*
 615          * uaddr can be NULL and addr_len can be 0 if:
 616          * sk is a TCP fastopen active socket and
 617          * TCP_FASTOPEN_CONNECT sockopt is set and
 618          * we already have a valid cookie for this socket.
 619          * In this case, user can call write() after connect().
 620          * write() will invoke tcp_sendmsg_fastopen() which calls
 621          * __inet_stream_connect().
 622          */
 623         if (uaddr) {
 624                 if (addr_len < sizeof(uaddr->sa_family))
 625                         return -EINVAL;
 626
 627                 if (uaddr->sa_family == AF_UNSPEC) {
 628                         err = sk->sk_prot->disconnect(sk, flags);
 629                         sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
 630                         goto out;
 631                 }
 632         }
 633
 634         switch (sock->state) {
 635         default:
 636                 err = -EINVAL;
 637                 goto out;
 638         case SS_CONNECTED:
 639                 err = -EISCONN;
 640                 goto out;
 641         case SS_CONNECTING:
 642                 if (inet_sk(sk)->defer_connect)
 643                         err = is_sendmsg ? -EINPROGRESS : -EISCONN;
 644                 else
 645                         err = -EALREADY;
 646                 /* Fall out of switch with err, set for this state */
 647                 break;
 648         case SS_UNCONNECTED:
 649                 err = -EISCONN;
 650                 if (sk->sk_state != TCP_CLOSE)
 651                         goto out;
 652
 653                 if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) {
 654                         err = sk->sk_prot->pre_connect(sk, uaddr, addr_len);
 655                         if (err)
 656                                 goto out;
 657                 }
 658
 659                 err = sk->sk_prot->connect(sk, uaddr, addr_len);
 660                 if (err < 0)
 661                         goto out;
 662
 663                 sock->state = SS_CONNECTING;
 664
 665                 if (!err && inet_sk(sk)->defer_connect)
 666                         goto out;
 667
 668                 /* Just entered SS_CONNECTING state; the only
 669                  * difference is that return value in non-blocking
 670                  * case is EINPROGRESS, rather than EALREADY.
 671                  */
 672                 err = -EINPROGRESS;
 673                 break;
 674         }
 675
 676         timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
 677
 678         if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
 679                 int writebias = (sk->sk_protocol == IPPROTO_TCP) &&
 680                                 tcp_sk(sk)->fastopen_req &&
 681                                 tcp_sk(sk)->fastopen_req->data ? 1 : 0;
 682
 683                 /* Error code is set above */
 684                 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias))
 685                         goto out;
 686
 687                 err = sock_intr_errno(timeo);
 688                 if (signal_pending(current))
 689                         goto out;
 690         }
 691
 692         /* Connection was closed by RST, timeout, ICMP error
 693          * or another process disconnected us.
 694          */
 695         if (sk->sk_state == TCP_CLOSE)
 696                 goto sock_error;
 697
 698         /* sk->sk_err may be not zero now, if RECVERR was ordered by user
 699          * and error was received after socket entered established state.
 700          * Hence, it is handled normally after connect() return successfully.
 701          */
 702
 703         sock->state = SS_CONNECTED;
 704         err = 0;
 705 out:
 706         return err;
 707
 708 sock_error:
 709         err = sock_error(sk) ? : -ECONNABORTED;
 710         sock->state = SS_UNCONNECTED;
 711         if (sk->sk_prot->disconnect(sk, flags))
 712                 sock->state = SS_DISCONNECTING;
 713         goto out;
 714 }
 715 EXPORT_SYMBOL(__inet_stream_connect);
 716
 717 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
 718                         int addr_len, int flags)
 719 {
 720         int err;
 721
 722         lock_sock(sock->sk);
 723         err = __inet_stream_connect(sock, uaddr, addr_len, flags, 0);
 724         release_sock(sock->sk);
 725         return err;
 726 }
 727 EXPORT_SYMBOL(inet_stream_connect);
 728
 729 /*
 730  *      Accept a pending connection. The TCP layer now gives BSD semantics.
 731  */
 732
 733 int inet_accept(struct socket *sock, struct socket *newsock, int flags,
 734                 bool kern)
 735 {
 736         struct sock *sk1 = sock->sk;
 737         int err = -EINVAL;
 738         struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err, kern);
 739
 740         if (!sk2)
 741                 goto do_err;
 742
 743         lock_sock(sk2);
 744
 745         sock_rps_record_flow(sk2);
 746         WARN_ON(!((1 << sk2->sk_state) &
 747                   (TCPF_ESTABLISHED | TCPF_SYN_RECV |
 748                   TCPF_CLOSE_WAIT | TCPF_CLOSE)));
 749
 750         sock_graft(sk2, newsock);
 751
 752         newsock->state = SS_CONNECTED;
 753         err = 0;
 754         release_sock(sk2);
 755 do_err:
 756         return err;
 757 }
 758 EXPORT_SYMBOL(inet_accept);
 759
 760
 761 /*
 762  *      This does both peername and sockname.
 763  */
 764 int inet_getname(struct socket *sock, struct sockaddr *uaddr,
 765                         int peer)
 766 {
 767         struct sock *sk         = sock->sk;
 768         struct inet_sock *inet  = inet_sk(sk);
 769         DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr);
 770
 771         sin->sin_family = AF_INET;
 772         if (peer) {
 773                 if (!inet->inet_dport ||
 774                     (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
 775                      peer == 1))
 776                         return -ENOTCONN;
 777                 sin->sin_port = inet->inet_dport;
 778                 sin->sin_addr.s_addr = inet->inet_daddr;
 779         } else {
 780                 __be32 addr = inet->inet_rcv_saddr;
 781                 if (!addr)
 782                         addr = inet->inet_saddr;
 783                 sin->sin_port = inet->inet_sport;
 784                 sin->sin_addr.s_addr = addr;
 785         }
 786         memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 787         return sizeof(*sin);
 788 }
 789 EXPORT_SYMBOL(inet_getname);
 790
 791 int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
 792 {
 793         struct sock *sk = sock->sk;
 794
 795         sock_rps_record_flow(sk);
 796
 797         /* We may need to bind the socket. */
 798         if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
 799             inet_autobind(sk))
 800                 return -EAGAIN;
 801
 802         return sk->sk_prot->sendmsg(sk, msg, size);
 803 }
 804 EXPORT_SYMBOL(inet_sendmsg);
 805
 806 ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset,
 807                       size_t size, int flags)
 808 {
 809         struct sock *sk = sock->sk;
 810
 811         sock_rps_record_flow(sk);
 812
 813         /* We may need to bind the socket. */
 814         if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
 815             inet_autobind(sk))
 816                 return -EAGAIN;
 817
 818         if (sk->sk_prot->sendpage)
 819                 return sk->sk_prot->sendpage(sk, page, offset, size, flags);
 820         return sock_no_sendpage(sock, page, offset, size, flags);
 821 }
 822 EXPORT_SYMBOL(inet_sendpage);
 823
 824 int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
 825                  int flags)
 826 {
 827         struct sock *sk = sock->sk;
 828         int addr_len = 0;
 829         int err;
 830
 831         if (likely(!(flags & MSG_ERRQUEUE)))
 832                 sock_rps_record_flow(sk);
 833
 834         err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
 835                                    flags & ~MSG_DONTWAIT, &addr_len);
 836         if (err >= 0)
 837                 msg->msg_namelen = addr_len;
 838         return err;
 839 }
 840 EXPORT_SYMBOL(inet_recvmsg);
 841
 842 int inet_shutdown(struct socket *sock, int how)
 843 {
 844         struct sock *sk = sock->sk;
 845         int err = 0;
 846
 847         /* This should really check to make sure
 848          * the socket is a TCP socket. (WHY AC...)
 849          */
 850         how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
 851                        1->2 bit 2 snds.
 852                        2->3 */
 853         if ((how & ~SHUTDOWN_MASK) || !how)     /* MAXINT->0 */
 854                 return -EINVAL;
 855
 856         lock_sock(sk);
 857         if (sock->state == SS_CONNECTING) {
 858                 if ((1 << sk->sk_state) &
 859                     (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
 860                         sock->state = SS_DISCONNECTING;
 861                 else
 862                         sock->state = SS_CONNECTED;
 863         }
 864
 865         switch (sk->sk_state) {
 866         case TCP_CLOSE:
 867                 err = -ENOTCONN;
 868                 /* Hack to wake up other listeners, who can poll for
 869                    EPOLLHUP, even on eg. unconnected UDP sockets -- RR */
 870                 /* fall through */
 871         default:
 872                 sk->sk_shutdown |= how;
 873                 if (sk->sk_prot->shutdown)
 874                         sk->sk_prot->shutdown(sk, how);
 875                 break;
 876
 877         /* Remaining two branches are temporary solution for missing
 878          * close() in multithreaded environment. It is _not_ a good idea,
 879          * but we have no choice until close() is repaired at VFS level.
 880          */
 881         case TCP_LISTEN:
 882                 if (!(how & RCV_SHUTDOWN))
 883                         break;
 884                 /* fall through */
 885         case TCP_SYN_SENT:
 886                 err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
 887                 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
 888                 break;
 889         }
 890
 891         /* Wake up anyone sleeping in poll. */
 892         sk->sk_state_change(sk);
 893         release_sock(sk);
 894         return err;
 895 }
 896 EXPORT_SYMBOL(inet_shutdown);
 897
 898 /*
 899  *      ioctl() calls you can issue on an INET socket. Most of these are
 900  *      device configuration and stuff and very rarely used. Some ioctls
 901  *      pass on to the socket itself.
 902  *
 903  *      NOTE: I like the idea of a module for the config stuff. ie ifconfig
 904  *      loads the devconfigure module does its configuring and unloads it.
 905  *      There's a good 20K of config code hanging around the kernel.
 906  */
 907
 908 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 909 {
 910         struct sock *sk = sock->sk;
 911         int err = 0;
 912         struct net *net = sock_net(sk);
 913         void __user *p = (void __user *)arg;
 914         struct ifreq ifr;
 915         struct rtentry rt;
 916
 917         switch (cmd) {
 918         case SIOCGSTAMP:
 919                 err = sock_get_timestamp(sk, (struct timeval __user *)arg);
 920                 break;
 921         case SIOCGSTAMPNS:
 922                 err = sock_get_timestampns(sk, (struct timespec __user *)arg);
 923                 break;
 924         case SIOCADDRT:
 925         case SIOCDELRT:
 926                 if (copy_from_user(&rt, p, sizeof(struct rtentry)))
 927                         return -EFAULT;
 928                 err = ip_rt_ioctl(net, cmd, &rt);
 929                 break;
 930         case SIOCRTMSG:
 931                 err = -EINVAL;
 932                 break;
 933         case SIOCDARP:
 934         case SIOCGARP:
 935         case SIOCSARP:
 936                 err = arp_ioctl(net, cmd, (void __user *)arg);
 937                 break;
 938         case SIOCGIFADDR:
 939         case SIOCGIFBRDADDR:
 940         case SIOCGIFNETMASK:
 941         case SIOCGIFDSTADDR:
 942         case SIOCGIFPFLAGS:
 943                 if (copy_from_user(&ifr, p, sizeof(struct ifreq)))
 944                         return -EFAULT;
 945                 err = devinet_ioctl(net, cmd, &ifr);
 946                 if (!err && copy_to_user(p, &ifr, sizeof(struct ifreq)))
 947                         err = -EFAULT;
 948                 break;
 949
 950         case SIOCSIFADDR:
 951         case SIOCSIFBRDADDR:
 952         case SIOCSIFNETMASK:
 953         case SIOCSIFDSTADDR:
 954         case SIOCSIFPFLAGS:
 955         case SIOCSIFFLAGS:
 956                 if (copy_from_user(&ifr, p, sizeof(struct ifreq)))
 957                         return -EFAULT;
 958                 err = devinet_ioctl(net, cmd, &ifr);
 959                 break;
 960         default:
 961                 if (sk->sk_prot->ioctl)
 962                         err = sk->sk_prot->ioctl(sk, cmd, arg);
 963                 else
 964                         err = -ENOIOCTLCMD;
 965                 break;
 966         }
 967         return err;
 968 }
 969 EXPORT_SYMBOL(inet_ioctl);
 970
 971 #ifdef CONFIG_COMPAT
 972 static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 973 {
 974         struct sock *sk = sock->sk;
 975         int err = -ENOIOCTLCMD;
 976
 977         if (sk->sk_prot->compat_ioctl)
 978                 err = sk->sk_prot->compat_ioctl(sk, cmd, arg);
 979
 980         return err;
 981 }
 982 #endif
 983
 984 const struct proto_ops inet_stream_ops = {
 985         .family            = PF_INET,
 986         .owner             = THIS_MODULE,
 987         .release           = inet_release,
 988         .bind              = inet_bind,
 989         .connect           = inet_stream_connect,
 990         .socketpair        = sock_no_socketpair,
 991         .accept            = inet_accept,
 992         .getname           = inet_getname,
 993         .poll              = tcp_poll,
 994         .ioctl             = inet_ioctl,
 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 };
1017 EXPORT_SYMBOL(inet_stream_ops);
1018
1019 const 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         .listen            = sock_no_listen,
1031         .shutdown          = inet_shutdown,
1032         .setsockopt        = sock_common_setsockopt,
1033         .getsockopt        = sock_common_getsockopt,
1034         .sendmsg           = inet_sendmsg,
1035         .recvmsg           = inet_recvmsg,
1036         .mmap              = sock_no_mmap,
1037         .sendpage          = inet_sendpage,
1038         .set_peek_off      = sk_set_peek_off,
1039 #ifdef CONFIG_COMPAT
1040         .compat_setsockopt = compat_sock_common_setsockopt,
1041         .compat_getsockopt = compat_sock_common_getsockopt,
1042         .compat_ioctl      = inet_compat_ioctl,
1043 #endif
1044 };
1045 EXPORT_SYMBOL(inet_dgram_ops);
1046
1047 /*
1048  * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
1049  * udp_poll
1050  */
1051 static const struct proto_ops inet_sockraw_ops = {
1052         .family            = PF_INET,
1053         .owner             = THIS_MODULE,
1054         .release           = inet_release,
1055         .bind              = inet_bind,
1056         .connect           = inet_dgram_connect,
1057         .socketpair        = sock_no_socketpair,
1058         .accept            = sock_no_accept,
1059         .getname           = inet_getname,
1060         .poll              = datagram_poll,
1061         .ioctl             = inet_ioctl,
1062         .listen            = sock_no_listen,
1063         .shutdown          = inet_shutdown,
1064         .setsockopt        = sock_common_setsockopt,
1065         .getsockopt        = sock_common_getsockopt,
1066         .sendmsg           = inet_sendmsg,
1067         .recvmsg           = inet_recvmsg,
1068         .mmap              = sock_no_mmap,
1069         .sendpage          = inet_sendpage,
1070 #ifdef CONFIG_COMPAT
1071         .compat_setsockopt = compat_sock_common_setsockopt,
1072         .compat_getsockopt = compat_sock_common_getsockopt,
1073         .compat_ioctl      = inet_compat_ioctl,
1074 #endif
1075 };
1076
1077 static const struct net_proto_family inet_family_ops = {
1078         .family = PF_INET,
1079         .create = inet_create,
1080         .owner  = THIS_MODULE,
1081 };
1082
1083 /* Upon startup we insert all the elements in inetsw_array[] into
1084  * the linked list inetsw.
1085  */
1086 static struct inet_protosw inetsw_array[] =
1087 {
1088         {
1089                 .type =       SOCK_STREAM,
1090                 .protocol =   IPPROTO_TCP,
1091                 .prot =       &tcp_prot,
1092                 .ops =        &inet_stream_ops,
1093                 .flags =      INET_PROTOSW_PERMANENT |
1094                               INET_PROTOSW_ICSK,
1095         },
1096
1097         {
1098                 .type =       SOCK_DGRAM,
1099                 .protocol =   IPPROTO_UDP,
1100                 .prot =       &udp_prot,
1101                 .ops =        &inet_dgram_ops,
1102                 .flags =      INET_PROTOSW_PERMANENT,
1103        },
1104
1105        {
1106                 .type =       SOCK_DGRAM,
1107                 .protocol =   IPPROTO_ICMP,
1108                 .prot =       &ping_prot,
1109                 .ops =        &inet_sockraw_ops,
1110                 .flags =      INET_PROTOSW_REUSE,
1111        },
1112
1113        {
1114                .type =       SOCK_RAW,
1115                .protocol =   IPPROTO_IP,        /* wild card */
1116                .prot =       &raw_prot,
1117                .ops =        &inet_sockraw_ops,
1118                .flags =      INET_PROTOSW_REUSE,
1119        }
1120 };
1121
1122 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
1123
1124 void inet_register_protosw(struct inet_protosw *p)
1125 {
1126         struct list_head *lh;
1127         struct inet_protosw *answer;
1128         int protocol = p->protocol;
1129         struct list_head *last_perm;
1130
1131         spin_lock_bh(&inetsw_lock);
1132
1133         if (p->type >= SOCK_MAX)
1134                 goto out_illegal;
1135
1136         /* If we are trying to override a permanent protocol, bail. */
1137         last_perm = &inetsw[p->type];
1138         list_for_each(lh, &inetsw[p->type]) {
1139                 answer = list_entry(lh, struct inet_protosw, list);
1140                 /* Check only the non-wild match. */
1141                 if ((INET_PROTOSW_PERMANENT & answer->flags) == 0)
1142                         break;
1143                 if (protocol == answer->protocol)
1144                         goto out_permanent;
1145                 last_perm = lh;
1146         }
1147
1148         /* Add the new entry after the last permanent entry if any, so that
1149          * the new entry does not override a permanent entry when matched with
1150          * a wild-card protocol. But it is allowed to override any existing
1151          * non-permanent entry.  This means that when we remove this entry, the
1152          * system automatically returns to the old behavior.
1153          */
1154         list_add_rcu(&p->list, last_perm);
1155 out:
1156         spin_unlock_bh(&inetsw_lock);
1157
1158         return;
1159
1160 out_permanent:
1161         pr_err("Attempt to override permanent protocol %d\n", protocol);
1162         goto out;
1163
1164 out_illegal:
1165         pr_err("Ignoring attempt to register invalid socket type %d\n",
1166                p->type);
1167         goto out;
1168 }
1169 EXPORT_SYMBOL(inet_register_protosw);
1170
1171 void inet_unregister_protosw(struct inet_protosw *p)
1172 {
1173         if (INET_PROTOSW_PERMANENT & p->flags) {
1174                 pr_err("Attempt to unregister permanent protocol %d\n",
1175                        p->protocol);
1176         } else {
1177                 spin_lock_bh(&inetsw_lock);
1178                 list_del_rcu(&p->list);
1179                 spin_unlock_bh(&inetsw_lock);
1180
1181                 synchronize_net();
1182         }
1183 }
1184 EXPORT_SYMBOL(inet_unregister_protosw);
1185
1186 static int inet_sk_reselect_saddr(struct sock *sk)
1187 {
1188         struct inet_sock *inet = inet_sk(sk);
1189         __be32 old_saddr = inet->inet_saddr;
1190         __be32 daddr = inet->inet_daddr;
1191         struct flowi4 *fl4;
1192         struct rtable *rt;
1193         __be32 new_saddr;
1194         struct ip_options_rcu *inet_opt;
1195
1196         inet_opt = rcu_dereference_protected(inet->inet_opt,
1197                                              lockdep_sock_is_held(sk));
1198         if (inet_opt && inet_opt->opt.srr)
1199                 daddr = inet_opt->opt.faddr;
1200
1201         /* Query new route. */
1202         fl4 = &inet->cork.fl.u.ip4;
1203         rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk),
1204                               sk->sk_bound_dev_if, sk->sk_protocol,
1205                               inet->inet_sport, inet->inet_dport, sk);
1206         if (IS_ERR(rt))
1207                 return PTR_ERR(rt);
1208
1209         sk_setup_caps(sk, &rt->dst);
1210
1211         new_saddr = fl4->saddr;
1212
1213         if (new_saddr == old_saddr)
1214                 return 0;
1215
1216         if (sock_net(sk)->ipv4.sysctl_ip_dynaddr > 1) {
1217                 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n",
1218                         __func__, &old_saddr, &new_saddr);
1219         }
1220
1221         inet->inet_saddr = inet->inet_rcv_saddr = new_saddr;
1222
1223         /*
1224          * XXX The only one ugly spot where we need to
1225          * XXX really change the sockets identity after
1226          * XXX it has entered the hashes. -DaveM
1227          *
1228          * Besides that, it does not check for connection
1229          * uniqueness. Wait for troubles.
1230          */
1231         return __sk_prot_rehash(sk);
1232 }
1233
1234 int inet_sk_rebuild_header(struct sock *sk)
1235 {
1236         struct inet_sock *inet = inet_sk(sk);
1237         struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0);
1238         __be32 daddr;
1239         struct ip_options_rcu *inet_opt;
1240         struct flowi4 *fl4;
1241         int err;
1242
1243         /* Route is OK, nothing to do. */
1244         if (rt)
1245                 return 0;
1246
1247         /* Reroute. */
1248         rcu_read_lock();
1249         inet_opt = rcu_dereference(inet->inet_opt);
1250         daddr = inet->inet_daddr;
1251         if (inet_opt && inet_opt->opt.srr)
1252                 daddr = inet_opt->opt.faddr;
1253         rcu_read_unlock();
1254         fl4 = &inet->cork.fl.u.ip4;
1255         rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr,
1256                                    inet->inet_dport, inet->inet_sport,
1257                                    sk->sk_protocol, RT_CONN_FLAGS(sk),
1258                                    sk->sk_bound_dev_if);
1259         if (!IS_ERR(rt)) {
1260                 err = 0;
1261                 sk_setup_caps(sk, &rt->dst);
1262         } else {
1263                 err = PTR_ERR(rt);
1264
1265                 /* Routing failed... */
1266                 sk->sk_route_caps = 0;
1267                 /*
1268                  * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1269                  * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1270                  */
1271                 if (!sock_net(sk)->ipv4.sysctl_ip_dynaddr ||
1272                     sk->sk_state != TCP_SYN_SENT ||
1273                     (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
1274                     (err = inet_sk_reselect_saddr(sk)) != 0)
1275                         sk->sk_err_soft = -err;
1276         }
1277
1278         return err;
1279 }
1280 EXPORT_SYMBOL(inet_sk_rebuild_header);
1281
1282 void inet_sk_set_state(struct sock *sk, int state)
1283 {
1284         trace_inet_sock_set_state(sk, sk->sk_state, state);
1285         sk->sk_state = state;
1286 }
1287 EXPORT_SYMBOL(inet_sk_set_state);
1288
1289 void inet_sk_state_store(struct sock *sk, int newstate)
1290 {
1291         trace_inet_sock_set_state(sk, sk->sk_state, newstate);
1292         smp_store_release(&sk->sk_state, newstate);
1293 }
1294
1295 struct sk_buff *inet_gso_segment(struct sk_buff *skb,
1296                                  netdev_features_t features)
1297 {
1298         bool udpfrag = false, fixedid = false, gso_partial, encap;
1299         struct sk_buff *segs = ERR_PTR(-EINVAL);
1300         const struct net_offload *ops;
1301         unsigned int offset = 0;
1302         struct iphdr *iph;
1303         int proto, tot_len;
1304         int nhoff;
1305         int ihl;
1306         int id;
1307
1308         skb_reset_network_header(skb);
1309         nhoff = skb_network_header(skb) - skb_mac_header(skb);
1310         if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1311                 goto out;
1312
1313         iph = ip_hdr(skb);
1314         ihl = iph->ihl * 4;
1315         if (ihl < sizeof(*iph))
1316                 goto out;
1317
1318         id = ntohs(iph->id);
1319         proto = iph->protocol;
1320
1321         /* Warning: after this point, iph might be no longer valid */
1322         if (unlikely(!pskb_may_pull(skb, ihl)))
1323                 goto out;
1324         __skb_pull(skb, ihl);
1325
1326         encap = SKB_GSO_CB(skb)->encap_level > 0;
1327         if (encap)
1328                 features &= skb->dev->hw_enc_features;
1329         SKB_GSO_CB(skb)->encap_level += ihl;
1330
1331         skb_reset_transport_header(skb);
1332
1333         segs = ERR_PTR(-EPROTONOSUPPORT);
1334
1335         if (!skb->encapsulation || encap) {
1336                 udpfrag = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP);
1337                 fixedid = !!(skb_shinfo(skb)->gso_type & SKB_GSO_TCP_FIXEDID);
1338
1339                 /* fixed ID is invalid if DF bit is not set */
1340                 if (fixedid && !(ip_hdr(skb)->frag_off & htons(IP_DF)))
1341                         goto out;
1342         }
1343
1344         ops = rcu_dereference(inet_offloads[proto]);
1345         if (likely(ops && ops->callbacks.gso_segment))
1346                 segs = ops->callbacks.gso_segment(skb, features);
1347
1348         if (IS_ERR_OR_NULL(segs))
1349                 goto out;
1350
1351         gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL);
1352
1353         skb = segs;
1354         do {
1355                 iph = (struct iphdr *)(skb_mac_header(skb) + nhoff);
1356                 if (udpfrag) {
1357                         iph->frag_off = htons(offset >> 3);
1358                         if (skb->next)
1359                                 iph->frag_off |= htons(IP_MF);
1360                         offset += skb->len - nhoff - ihl;
1361                         tot_len = skb->len - nhoff;
1362                 } else if (skb_is_gso(skb)) {
1363                         if (!fixedid) {
1364                                 iph->id = htons(id);
1365                                 id += skb_shinfo(skb)->gso_segs;
1366                         }
1367
1368                         if (gso_partial)
1369                                 tot_len = skb_shinfo(skb)->gso_size +
1370                                           SKB_GSO_CB(skb)->data_offset +
1371                                           skb->head - (unsigned char *)iph;
1372                         else
1373                                 tot_len = skb->len - nhoff;
1374                 } else {
1375                         if (!fixedid)
1376                                 iph->id = htons(id++);
1377                         tot_len = skb->len - nhoff;
1378                 }
1379                 iph->tot_len = htons(tot_len);
1380                 ip_send_check(iph);
1381                 if (encap)
1382                         skb_reset_inner_headers(skb);
1383                 skb->network_header = (u8 *)iph - skb->head;
1384                 skb_reset_mac_len(skb);
1385         } while ((skb = skb->next));
1386
1387 out:
1388         return segs;
1389 }
1390 EXPORT_SYMBOL(inet_gso_segment);
1391
1392 static struct sk_buff *ipip_gso_segment(struct sk_buff *skb,
1393                                         netdev_features_t features)
1394 {
1395         if (!(skb_shinfo(skb)->gso_type & SKB_GSO_IPXIP4))
1396                 return ERR_PTR(-EINVAL);
1397
1398         return inet_gso_segment(skb, features);
1399 }
1400
1401 INDIRECT_CALLABLE_DECLARE(struct sk_buff *tcp4_gro_receive(struct list_head *,
1402                                                            struct sk_buff *));
1403 INDIRECT_CALLABLE_DECLARE(struct sk_buff *udp4_gro_receive(struct list_head *,
1404                                                            struct sk_buff *));
1405 struct sk_buff *inet_gro_receive(struct list_head *head, struct sk_buff *skb)
1406 {
1407         const struct net_offload *ops;
1408         struct sk_buff *pp = NULL;
1409         const struct iphdr *iph;
1410         struct sk_buff *p;
1411         unsigned int hlen;
1412         unsigned int off;
1413         unsigned int id;
1414         int flush = 1;
1415         int proto;
1416
1417         off = skb_gro_offset(skb);
1418         hlen = off + sizeof(*iph);
1419         iph = skb_gro_header_fast(skb, off);
1420         if (skb_gro_header_hard(skb, hlen)) {
1421                 iph = skb_gro_header_slow(skb, hlen, off);
1422                 if (unlikely(!iph))
1423                         goto out;
1424         }
1425
1426         proto = iph->protocol;
1427
1428         rcu_read_lock();
1429         ops = rcu_dereference(inet_offloads[proto]);
1430         if (!ops || !ops->callbacks.gro_receive)
1431                 goto out_unlock;
1432
1433         if (*(u8 *)iph != 0x45)
1434                 goto out_unlock;
1435
1436         if (ip_is_fragment(iph))
1437                 goto out_unlock;
1438
1439         if (unlikely(ip_fast_csum((u8 *)iph, 5)))
1440                 goto out_unlock;
1441
1442         id = ntohl(*(__be32 *)&iph->id);
1443         flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF));
1444         id >>= 16;
1445
1446         list_for_each_entry(p, head, list) {
1447                 struct iphdr *iph2;
1448                 u16 flush_id;
1449
1450                 if (!NAPI_GRO_CB(p)->same_flow)
1451                         continue;
1452
1453                 iph2 = (struct iphdr *)(p->data + off);
1454                 /* The above works because, with the exception of the top
1455                  * (inner most) layer, we only aggregate pkts with the same
1456                  * hdr length so all the hdrs we'll need to verify will start
1457                  * at the same offset.
1458                  */
1459                 if ((iph->protocol ^ iph2->protocol) |
1460                     ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) |
1461                     ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) {
1462                         NAPI_GRO_CB(p)->same_flow = 0;
1463                         continue;
1464                 }
1465
1466                 /* All fields must match except length and checksum. */
1467                 NAPI_GRO_CB(p)->flush |=
1468                         (iph->ttl ^ iph2->ttl) |
1469                         (iph->tos ^ iph2->tos) |
1470                         ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF));
1471
1472                 NAPI_GRO_CB(p)->flush |= flush;
1473
1474                 /* We need to store of the IP ID check to be included later
1475                  * when we can verify that this packet does in fact belong
1476                  * to a given flow.
1477                  */
1478                 flush_id = (u16)(id - ntohs(iph2->id));
1479
1480                 /* This bit of code makes it much easier for us to identify
1481                  * the cases where we are doing atomic vs non-atomic IP ID
1482                  * checks.  Specifically an atomic check can return IP ID
1483                  * values 0 - 0xFFFF, while a non-atomic check can only
1484                  * return 0 or 0xFFFF.
1485                  */
1486                 if (!NAPI_GRO_CB(p)->is_atomic ||
1487                     !(iph->frag_off & htons(IP_DF))) {
1488                         flush_id ^= NAPI_GRO_CB(p)->count;
1489                         flush_id = flush_id ? 0xFFFF : 0;
1490                 }
1491
1492                 /* If the previous IP ID value was based on an atomic
1493                  * datagram we can overwrite the value and ignore it.
1494                  */
1495                 if (NAPI_GRO_CB(skb)->is_atomic)
1496                         NAPI_GRO_CB(p)->flush_id = flush_id;
1497                 else
1498                         NAPI_GRO_CB(p)->flush_id |= flush_id;
1499         }
1500
1501         NAPI_GRO_CB(skb)->is_atomic = !!(iph->frag_off & htons(IP_DF));
1502         NAPI_GRO_CB(skb)->flush |= flush;
1503         skb_set_network_header(skb, off);
1504         /* The above will be needed by the transport layer if there is one
1505          * immediately following this IP hdr.
1506          */
1507
1508         /* Note : No need to call skb_gro_postpull_rcsum() here,
1509          * as we already checked checksum over ipv4 header was 0
1510          */
1511         skb_gro_pull(skb, sizeof(*iph));
1512         skb_set_transport_header(skb, skb_gro_offset(skb));
1513
1514         pp = indirect_call_gro_receive(tcp4_gro_receive, udp4_gro_receive,
1515                                        ops->callbacks.gro_receive, head, skb);
1516
1517 out_unlock:
1518         rcu_read_unlock();
1519
1520 out:
1521         skb_gro_flush_final(skb, pp, flush);
1522
1523         return pp;
1524 }
1525 EXPORT_SYMBOL(inet_gro_receive);
1526
1527 static struct sk_buff *ipip_gro_receive(struct list_head *head,
1528                                         struct sk_buff *skb)
1529 {
1530         if (NAPI_GRO_CB(skb)->encap_mark) {
1531                 NAPI_GRO_CB(skb)->flush = 1;
1532                 return NULL;
1533         }
1534
1535         NAPI_GRO_CB(skb)->encap_mark = 1;
1536
1537         return inet_gro_receive(head, skb);
1538 }
1539
1540 #define SECONDS_PER_DAY 86400
1541
1542 /* inet_current_timestamp - Return IP network timestamp
1543  *
1544  * Return milliseconds since midnight in network byte order.
1545  */
1546 __be32 inet_current_timestamp(void)
1547 {
1548         u32 secs;
1549         u32 msecs;
1550         struct timespec64 ts;
1551
1552         ktime_get_real_ts64(&ts);
1553
1554         /* Get secs since midnight. */
1555         (void)div_u64_rem(ts.tv_sec, SECONDS_PER_DAY, &secs);
1556         /* Convert to msecs. */
1557         msecs = secs * MSEC_PER_SEC;
1558         /* Convert nsec to msec. */
1559         msecs += (u32)ts.tv_nsec / NSEC_PER_MSEC;
1560
1561         /* Convert to network byte order. */
1562         return htonl(msecs);
1563 }
1564 EXPORT_SYMBOL(inet_current_timestamp);
1565
1566 int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
1567 {
1568         if (sk->sk_family == AF_INET)
1569                 return ip_recv_error(sk, msg, len, addr_len);
1570 #if IS_ENABLED(CONFIG_IPV6)
1571         if (sk->sk_family == AF_INET6)
1572                 return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len);
1573 #endif
1574         return -EINVAL;
1575 }
1576
1577 INDIRECT_CALLABLE_DECLARE(int tcp4_gro_complete(struct sk_buff *, int));
1578 INDIRECT_CALLABLE_DECLARE(int udp4_gro_complete(struct sk_buff *, int));
1579 int inet_gro_complete(struct sk_buff *skb, int nhoff)
1580 {
1581         __be16 newlen = htons(skb->len - nhoff);
1582         struct iphdr *iph = (struct iphdr *)(skb->data + nhoff);
1583         const struct net_offload *ops;
1584         int proto = iph->protocol;
1585         int err = -ENOSYS;
1586
1587         if (skb->encapsulation) {
1588                 skb_set_inner_protocol(skb, cpu_to_be16(ETH_P_IP));
1589                 skb_set_inner_network_header(skb, nhoff);
1590         }
1591
1592         csum_replace2(&iph->check, iph->tot_len, newlen);
1593         iph->tot_len = newlen;
1594
1595         rcu_read_lock();
1596         ops = rcu_dereference(inet_offloads[proto]);
1597         if (WARN_ON(!ops || !ops->callbacks.gro_complete))
1598                 goto out_unlock;
1599
1600         /* Only need to add sizeof(*iph) to get to the next hdr below
1601          * because any hdr with option will have been flushed in
1602          * inet_gro_receive().
1603          */
1604         err = INDIRECT_CALL_2(ops->callbacks.gro_complete,
1605                               tcp4_gro_complete, udp4_gro_complete,
1606                               skb, nhoff + sizeof(*iph));
1607
1608 out_unlock:
1609         rcu_read_unlock();
1610
1611         return err;
1612 }
1613 EXPORT_SYMBOL(inet_gro_complete);
1614
1615 static int ipip_gro_complete(struct sk_buff *skb, int nhoff)
1616 {
1617         skb->encapsulation = 1;
1618         skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4;
1619         return inet_gro_complete(skb, nhoff);
1620 }
1621
1622 int inet_ctl_sock_create(struct sock **sk, unsigned short family,
1623                          unsigned short type, unsigned char protocol,
1624                          struct net *net)
1625 {
1626         struct socket *sock;
1627         int rc = sock_create_kern(net, family, type, protocol, &sock);
1628
1629         if (rc == 0) {
1630                 *sk = sock->sk;
1631                 (*sk)->sk_allocation = GFP_ATOMIC;
1632                 /*
1633                  * Unhash it so that IP input processing does not even see it,
1634                  * we do not wish this socket to see incoming packets.
1635                  */
1636                 (*sk)->sk_prot->unhash(*sk);
1637         }
1638         return rc;
1639 }
1640 EXPORT_SYMBOL_GPL(inet_ctl_sock_create);
1641
1642 u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offt)
1643 {
1644         return  *(((unsigned long *)per_cpu_ptr(mib, cpu)) + offt);
1645 }
1646 EXPORT_SYMBOL_GPL(snmp_get_cpu_field);
1647
1648 unsigned long snmp_fold_field(void __percpu *mib, int offt)
1649 {
1650         unsigned long res = 0;
1651         int i;
1652
1653         for_each_possible_cpu(i)
1654                 res += snmp_get_cpu_field(mib, i, offt);
1655         return res;
1656 }
1657 EXPORT_SYMBOL_GPL(snmp_fold_field);
1658
1659 #if BITS_PER_LONG==32
1660
1661 u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offt,
1662                          size_t syncp_offset)
1663 {
1664         void *bhptr;
1665         struct u64_stats_sync *syncp;
1666         u64 v;
1667         unsigned int start;
1668
1669         bhptr = per_cpu_ptr(mib, cpu);
1670         syncp = (struct u64_stats_sync *)(bhptr + syncp_offset);
1671         do {
1672                 start = u64_stats_fetch_begin_irq(syncp);
1673                 v = *(((u64 *)bhptr) + offt);
1674         } while (u64_stats_fetch_retry_irq(syncp, start));
1675
1676         return v;
1677 }
1678 EXPORT_SYMBOL_GPL(snmp_get_cpu_field64);
1679
1680 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset)
1681 {
1682         u64 res = 0;
1683         int cpu;
1684
1685         for_each_possible_cpu(cpu) {
1686                 res += snmp_get_cpu_field64(mib, cpu, offt, syncp_offset);
1687         }
1688         return res;
1689 }
1690 EXPORT_SYMBOL_GPL(snmp_fold_field64);
1691 #endif
1692
1693 #ifdef CONFIG_IP_MULTICAST
1694 static const struct net_protocol igmp_protocol = {
1695         .handler =      igmp_rcv,
1696         .netns_ok =     1,
1697 };
1698 #endif
1699
1700 /* thinking of making this const? Don't.
1701  * early_demux can change based on sysctl.
1702  */
1703 static struct net_protocol tcp_protocol = {
1704         .early_demux    =       tcp_v4_early_demux,
1705         .early_demux_handler =  tcp_v4_early_demux,
1706         .handler        =       tcp_v4_rcv,
1707         .err_handler    =       tcp_v4_err,
1708         .no_policy      =       1,
1709         .netns_ok       =       1,
1710         .icmp_strict_tag_validation = 1,
1711 };
1712
1713 /* thinking of making this const? Don't.
1714  * early_demux can change based on sysctl.
1715  */
1716 static struct net_protocol udp_protocol = {
1717         .early_demux =  udp_v4_early_demux,
1718         .early_demux_handler =  udp_v4_early_demux,
1719         .handler =      udp_rcv,
1720         .err_handler =  udp_err,
1721         .no_policy =    1,
1722         .netns_ok =     1,
1723 };
1724
1725 static const struct net_protocol icmp_protocol = {
1726         .handler =      icmp_rcv,
1727         .err_handler =  icmp_err,
1728         .no_policy =    1,
1729         .netns_ok =     1,
1730 };
1731
1732 static __net_init int ipv4_mib_init_net(struct net *net)
1733 {
1734         int i;
1735
1736         net->mib.tcp_statistics = alloc_percpu(struct tcp_mib);
1737         if (!net->mib.tcp_statistics)
1738                 goto err_tcp_mib;
1739         net->mib.ip_statistics = alloc_percpu(struct ipstats_mib);
1740         if (!net->mib.ip_statistics)
1741                 goto err_ip_mib;
1742
1743         for_each_possible_cpu(i) {
1744                 struct ipstats_mib *af_inet_stats;
1745                 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i);
1746                 u64_stats_init(&af_inet_stats->syncp);
1747         }
1748
1749         net->mib.net_statistics = alloc_percpu(struct linux_mib);
1750         if (!net->mib.net_statistics)
1751                 goto err_net_mib;
1752         net->mib.udp_statistics = alloc_percpu(struct udp_mib);
1753         if (!net->mib.udp_statistics)
1754                 goto err_udp_mib;
1755         net->mib.udplite_statistics = alloc_percpu(struct udp_mib);
1756         if (!net->mib.udplite_statistics)
1757                 goto err_udplite_mib;
1758         net->mib.icmp_statistics = alloc_percpu(struct icmp_mib);
1759         if (!net->mib.icmp_statistics)
1760                 goto err_icmp_mib;
1761         net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib),
1762                                               GFP_KERNEL);
1763         if (!net->mib.icmpmsg_statistics)
1764                 goto err_icmpmsg_mib;
1765
1766         tcp_mib_init(net);
1767         return 0;
1768
1769 err_icmpmsg_mib:
1770         free_percpu(net->mib.icmp_statistics);
1771 err_icmp_mib:
1772         free_percpu(net->mib.udplite_statistics);
1773 err_udplite_mib:
1774         free_percpu(net->mib.udp_statistics);
1775 err_udp_mib:
1776         free_percpu(net->mib.net_statistics);
1777 err_net_mib:
1778         free_percpu(net->mib.ip_statistics);
1779 err_ip_mib:
1780         free_percpu(net->mib.tcp_statistics);
1781 err_tcp_mib:
1782         return -ENOMEM;
1783 }
1784
1785 static __net_exit void ipv4_mib_exit_net(struct net *net)
1786 {
1787         kfree(net->mib.icmpmsg_statistics);
1788         free_percpu(net->mib.icmp_statistics);
1789         free_percpu(net->mib.udplite_statistics);
1790         free_percpu(net->mib.udp_statistics);
1791         free_percpu(net->mib.net_statistics);
1792         free_percpu(net->mib.ip_statistics);
1793         free_percpu(net->mib.tcp_statistics);
1794 }
1795
1796 static __net_initdata struct pernet_operations ipv4_mib_ops = {
1797         .init = ipv4_mib_init_net,
1798         .exit = ipv4_mib_exit_net,
1799 };
1800
1801 static int __init init_ipv4_mibs(void)
1802 {
1803         return register_pernet_subsys(&ipv4_mib_ops);
1804 }
1805
1806 static __net_init int inet_init_net(struct net *net)
1807 {
1808         /*
1809          * Set defaults for local port range
1810          */
1811         seqlock_init(&net->ipv4.ip_local_ports.lock);
1812         net->ipv4.ip_local_ports.range[0] =  32768;
1813         net->ipv4.ip_local_ports.range[1] =  60999;
1814
1815         seqlock_init(&net->ipv4.ping_group_range.lock);
1816         /*
1817          * Sane defaults - nobody may create ping sockets.
1818          * Boot scripts should set this to distro-specific group.
1819          */
1820         net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1);
1821         net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0);
1822
1823         /* Default values for sysctl-controlled parameters.
1824          * We set them here, in case sysctl is not compiled.
1825          */
1826         net->ipv4.sysctl_ip_default_ttl = IPDEFTTL;
1827         net->ipv4.sysctl_ip_fwd_update_priority = 1;
1828         net->ipv4.sysctl_ip_dynaddr = 0;
1829         net->ipv4.sysctl_ip_early_demux = 1;
1830         net->ipv4.sysctl_udp_early_demux = 1;
1831         net->ipv4.sysctl_tcp_early_demux = 1;
1832 #ifdef CONFIG_SYSCTL
1833         net->ipv4.sysctl_ip_prot_sock = PROT_SOCK;
1834 #endif
1835
1836         /* Some igmp sysctl, whose values are always used */
1837         net->ipv4.sysctl_igmp_max_memberships = 20;
1838         net->ipv4.sysctl_igmp_max_msf = 10;
1839         /* IGMP reports for link-local multicast groups are enabled by default */
1840         net->ipv4.sysctl_igmp_llm_reports = 1;
1841         net->ipv4.sysctl_igmp_qrv = 2;
1842
1843         return 0;
1844 }
1845
1846 static __net_exit void inet_exit_net(struct net *net)
1847 {
1848 }
1849
1850 static __net_initdata struct pernet_operations af_inet_ops = {
1851         .init = inet_init_net,
1852         .exit = inet_exit_net,
1853 };
1854
1855 static int __init init_inet_pernet_ops(void)
1856 {
1857         return register_pernet_subsys(&af_inet_ops);
1858 }
1859
1860 static int ipv4_proc_init(void);
1861
1862 /*
1863  *      IP protocol layer initialiser
1864  */
1865
1866 static struct packet_offload ip_packet_offload __read_mostly = {
1867         .type = cpu_to_be16(ETH_P_IP),
1868         .callbacks = {
1869                 .gso_segment = inet_gso_segment,
1870                 .gro_receive = inet_gro_receive,
1871                 .gro_complete = inet_gro_complete,
1872         },
1873 };
1874
1875 static const struct net_offload ipip_offload = {
1876         .callbacks = {
1877                 .gso_segment    = ipip_gso_segment,
1878                 .gro_receive    = ipip_gro_receive,
1879                 .gro_complete   = ipip_gro_complete,
1880         },
1881 };
1882
1883 static int __init ipip_offload_init(void)
1884 {
1885         return inet_add_offload(&ipip_offload, IPPROTO_IPIP);
1886 }
1887
1888 static int __init ipv4_offload_init(void)
1889 {
1890         /*
1891          * Add offloads
1892          */
1893         if (udpv4_offload_init() < 0)
1894                 pr_crit("%s: Cannot add UDP protocol offload\n", __func__);
1895         if (tcpv4_offload_init() < 0)
1896                 pr_crit("%s: Cannot add TCP protocol offload\n", __func__);
1897         if (ipip_offload_init() < 0)
1898                 pr_crit("%s: Cannot add IPIP protocol offload\n", __func__);
1899
1900         dev_add_offload(&ip_packet_offload);
1901         return 0;
1902 }
1903
1904 fs_initcall(ipv4_offload_init);
1905
1906 static struct packet_type ip_packet_type __read_mostly = {
1907         .type = cpu_to_be16(ETH_P_IP),
1908         .func = ip_rcv,
1909         .list_func = ip_list_rcv,
1910 };
1911
1912 static int __init inet_init(void)
1913 {
1914         struct inet_protosw *q;
1915         struct list_head *r;
1916         int rc = -EINVAL;
1917
1918         sock_skb_cb_check_size(sizeof(struct inet_skb_parm));
1919
1920         rc = proto_register(&tcp_prot, 1);
1921         if (rc)
1922                 goto out;
1923
1924         rc = proto_register(&udp_prot, 1);
1925         if (rc)
1926                 goto out_unregister_tcp_proto;
1927
1928         rc = proto_register(&raw_prot, 1);
1929         if (rc)
1930                 goto out_unregister_udp_proto;
1931
1932         rc = proto_register(&ping_prot, 1);
1933         if (rc)
1934                 goto out_unregister_raw_proto;
1935
1936         /*
1937          *      Tell SOCKET that we are alive...
1938          */
1939
1940         (void)sock_register(&inet_family_ops);
1941
1942 #ifdef CONFIG_SYSCTL
1943         ip_static_sysctl_init();
1944 #endif
1945
1946         /*
1947          *      Add all the base protocols.
1948          */
1949
1950         if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
1951                 pr_crit("%s: Cannot add ICMP protocol\n", __func__);
1952         if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0)
1953                 pr_crit("%s: Cannot add UDP protocol\n", __func__);
1954         if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0)
1955                 pr_crit("%s: Cannot add TCP protocol\n", __func__);
1956 #ifdef CONFIG_IP_MULTICAST
1957         if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
1958                 pr_crit("%s: Cannot add IGMP protocol\n", __func__);
1959 #endif
1960
1961         /* Register the socket-side information for inet_create. */
1962         for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
1963                 INIT_LIST_HEAD(r);
1964
1965         for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
1966                 inet_register_protosw(q);
1967
1968         /*
1969          *      Set the ARP module up
1970          */
1971
1972         arp_init();
1973
1974         /*
1975          *      Set the IP module up
1976          */
1977
1978         ip_init();
1979
1980         /* Setup TCP slab cache for open requests. */
1981         tcp_init();
1982
1983         /* Setup UDP memory threshold */
1984         udp_init();
1985
1986         /* Add UDP-Lite (RFC 3828) */
1987         udplite4_register();
1988
1989         raw_init();
1990
1991         ping_init();
1992
1993         /*
1994          *      Set the ICMP layer up
1995          */
1996
1997         if (icmp_init() < 0)
1998                 panic("Failed to create the ICMP control socket.\n");
1999
2000         /*
2001          *      Initialise the multicast router
2002          */
2003 #if defined(CONFIG_IP_MROUTE)
2004         if (ip_mr_init())
2005                 pr_crit("%s: Cannot init ipv4 mroute\n", __func__);
2006 #endif
2007
2008         if (init_inet_pernet_ops())
2009                 pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__);
2010         /*
2011          *      Initialise per-cpu ipv4 mibs
2012          */
2013
2014         if (init_ipv4_mibs())
2015                 pr_crit("%s: Cannot init ipv4 mibs\n", __func__);
2016
2017         ipv4_proc_init();
2018
2019         ipfrag_init();
2020
2021         dev_add_pack(&ip_packet_type);
2022
2023         ip_tunnel_core_init();
2024
2025         rc = 0;
2026 out:
2027         return rc;
2028 out_unregister_raw_proto:
2029         proto_unregister(&raw_prot);
2030 out_unregister_udp_proto:
2031         proto_unregister(&udp_prot);
2032 out_unregister_tcp_proto:
2033         proto_unregister(&tcp_prot);
2034         goto out;
2035 }
2036
2037 fs_initcall(inet_init);
2038
2039 /* ------------------------------------------------------------------------ */
2040
2041 #ifdef CONFIG_PROC_FS
2042 static int __init ipv4_proc_init(void)
2043 {
2044         int rc = 0;
2045
2046         if (raw_proc_init())
2047                 goto out_raw;
2048         if (tcp4_proc_init())
2049                 goto out_tcp;
2050         if (udp4_proc_init())
2051                 goto out_udp;
2052         if (ping_proc_init())
2053                 goto out_ping;
2054         if (ip_misc_proc_init())
2055                 goto out_misc;
2056 out:
2057         return rc;
2058 out_misc:
2059         ping_proc_exit();
2060 out_ping:
2061         udp4_proc_exit();
2062 out_udp:
2063         tcp4_proc_exit();
2064 out_tcp:
2065         raw_proc_exit();
2066 out_raw:
2067         rc = -ENOMEM;
2068         goto out;
2069 }
2070
2071 #else /* CONFIG_PROC_FS */
2072 static int __init ipv4_proc_init(void)
2073 {
2074         return 0;
2075 }
2076 #endif /* CONFIG_PROC_FS */