net/ipv4/af_inet.c

   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  */
 125 static struct list_head inetsw[SOCK_MAX];
 126 static DEFINE_SPINLOCK(inetsw_lock);
 127
 128 /* New destruction routine */
 129
 130 void 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(rcu_dereference_protected(sk->sk_rx_dst, 1));
 161         sk_refcnt_debug_dec(sk);
 162 }
 163 EXPORT_SYMBOL(inet_sock_destruct);
 164
 165 /*
 166  *      The routines beyond this point handle the behaviour of an AF_INET
 167  *      socket object. Mostly it punts to the subprotocols of IP to do
 168  *      the work.
 169  */
 170
 171 /*
 172  *      Automatically bind an unbound socket.
 173  */
 174
 175 static int inet_autobind(struct sock *sk)
 176 {
 177         struct inet_sock *inet;
 178         /* We may need to bind the socket. */
 179         lock_sock(sk);
 180         inet = inet_sk(sk);
 181         if (!inet->inet_num) {
 182                 if (sk->sk_prot->get_port(sk, 0)) {
 183                         release_sock(sk);
 184                         return -EAGAIN;
 185                 }
 186                 inet->inet_sport = htons(inet->inet_num);
 187         }
 188         release_sock(sk);
 189         return 0;
 190 }
 191
 192 /*
 193  *      Move a socket into listening state.
 194  */
 195 int inet_listen(struct socket *sock, int backlog)
 196 {
 197         struct sock *sk = sock->sk;
 198         unsigned char old_state;
 199         int err, tcp_fastopen;
 200
 201         lock_sock(sk);
 202
 203         err = -EINVAL;
 204         if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM)
 205                 goto out;
 206
 207         old_state = sk->sk_state;
 208         if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN)))
 209                 goto out;
 210
 211         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 = READ_ONCE(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
 237 out:
 238         release_sock(sk);
 239         return err;
 240 }
 241 EXPORT_SYMBOL(inet_listen);
 242
 243 /*
 244  *      Create an inet socket.
 245  */
 246
 247 static int inet_create(struct net *net, struct socket *sock, int protocol,
 248                        int kern)
 249 {
 250         struct sock *sk;
 251         struct inet_protosw *answer;
 252         struct inet_sock *inet;
 253         struct proto *answer_prot;
 254         unsigned char answer_flags;
 255         int try_loading_module = 0;
 256         int err;
 257
 258         if (protocol < 0 || protocol >= IPPROTO_MAX)
 259                 return -EINVAL;
 260
 261         sock->state = SS_UNCONNECTED;
 262
 263         /* Look for the requested type/protocol pair. */
 264 lookup_protocol:
 265         err = -ESOCKTNOSUPPORT;
 266         rcu_read_lock();
 267         list_for_each_entry_rcu(answer, &inetsw[sock->type], list) {
 268
 269                 err = 0;
 270                 /* Check the non-wild match. */
 271                 if (protocol == answer->protocol) {
 272                         if (protocol != IPPROTO_IP)
 273                                 break;
 274                 } else {
 275                         /* Check for the two wild cases. */
 276                         if (IPPROTO_IP == protocol) {
 277                                 protocol = answer->protocol;
 278                                 break;
 279                         }
 280                         if (IPPROTO_IP == answer->protocol)
 281                                 break;
 282                 }
 283                 err = -EPROTONOSUPPORT;
 284         }
 285
 286         if (unlikely(err)) {
 287                 if (try_loading_module < 2) {
 288                         rcu_read_unlock();
 289                         /*
 290                          * Be more specific, e.g. net-pf-2-proto-132-type-1
 291                          * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
 292                          */
 293                         if (++try_loading_module == 1)
 294                                 request_module("net-pf-%d-proto-%d-type-%d",
 295                                                PF_INET, protocol, sock->type);
 296                         /*
 297                          * Fall back to generic, e.g. net-pf-2-proto-132
 298                          * (net-pf-PF_INET-proto-IPPROTO_SCTP)
 299                          */
 300                         else
 301                                 request_module("net-pf-%d-proto-%d",
 302                                                PF_INET, protocol);
 303                         goto lookup_protocol;
 304                 } else
 305                         goto out_rcu_unlock;
 306         }
 307
 308         err = -EPERM;
 309         if (sock->type == SOCK_RAW && !kern &&
 310             !ns_capable(net->user_ns, CAP_NET_RAW))
 311                 goto out_rcu_unlock;
 312
 313         sock->ops = answer->ops;
 314         answer_prot = answer->prot;
 315         answer_flags = answer->flags;
 316         rcu_read_unlock();
 317
 318         WARN_ON(!answer_prot->slab);
 319
 320         err = -ENOBUFS;
 321         sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot, kern);
 322         if (!sk)
 323                 goto out;
 324
 325         err = 0;
 326         if (INET_PROTOSW_REUSE & answer_flags)
 327                 sk->sk_reuse = SK_CAN_REUSE;
 328
 329         inet = inet_sk(sk);
 330         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
 331
 332         inet->nodefrag = 0;
 333
 334         if (SOCK_RAW == sock->type) {
 335                 inet->inet_num = protocol;
 336                 if (IPPROTO_RAW == protocol)
 337                         inet->hdrincl = 1;
 338         }
 339
 340         if (READ_ONCE(net->ipv4.sysctl_ip_no_pmtu_disc))
 341                 inet->pmtudisc = IP_PMTUDISC_DONT;
 342         else
 343                 inet->pmtudisc = IP_PMTUDISC_WANT;
 344
 345         inet->inet_id = 0;
 346
 347         sock_init_data(sock, sk);
 348
 349         sk->sk_destruct    = inet_sock_destruct;
 350         sk->sk_protocol    = protocol;
 351         sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
 352
 353         inet->uc_ttl    = -1;
 354         inet->mc_loop   = 1;
 355         inet->mc_ttl    = 1;
 356         inet->mc_all    = 1;
 357         inet->mc_index  = 0;
 358         inet->mc_list   = NULL;
 359         inet->rcv_tos   = 0;
 360
 361         sk_refcnt_debug_inc(sk);
 362
 363         if (inet->inet_num) {
 364                 /* It assumes that any protocol which allows
 365                  * the user to assign a number at socket
 366                  * creation time automatically
 367                  * shares.
 368                  */
 369                 inet->inet_sport = htons(inet->inet_num);
 370                 /* Add to protocol hash chains. */
 371                 err = sk->sk_prot->hash(sk);
 372                 if (err) {
 373                         sk_common_release(sk);
 374                         goto out;
 375                 }
 376         }
 377
 378         if (sk->sk_prot->init) {
 379                 err = sk->sk_prot->init(sk);
 380                 if (err) {
 381                         sk_common_release(sk);
 382                         goto out;
 383                 }
 384         }
 385
 386         if (!kern) {
 387                 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
 388                 if (err) {
 389                         sk_common_release(sk);
 390                         goto out;
 391                 }
 392         }
 393 out:
 394         return err;
 395 out_rcu_unlock:
 396         rcu_read_unlock();
 397         goto out;
 398 }
 399
 400
 401 /*
 402  *      The peer socket should always be NULL (or else). When we call this
 403  *      function we are destroying the object and from then on nobody
 404  *      should refer to it.
 405  */
 406 int inet_release(struct socket *sock)
 407 {
 408         struct sock *sk = sock->sk;
 409
 410         if (sk) {
 411                 long timeout;
 412
 413                 /* Applications forget to leave groups before exiting */
 414                 ip_mc_drop_socket(sk);
 415
 416                 /* If linger is set, we don't return until the close
 417                  * is complete.  Otherwise we return immediately. The
 418                  * actually closing is done the same either way.
 419                  *
 420                  * If the close is due to the process exiting, we never
 421                  * linger..
 422                  */
 423                 timeout = 0;
 424                 if (sock_flag(sk, SOCK_LINGER) &&
 425                     !(current->flags & PF_EXITING))
 426                         timeout = sk->sk_lingertime;
 427                 sk->sk_prot->close(sk, timeout);
 428                 sock->sk = NULL;
 429         }
 430         return 0;
 431 }
 432 EXPORT_SYMBOL(inet_release);
 433
 434 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 435 {
 436         struct sock *sk = sock->sk;
 437         int err;
 438
 439         /* If the socket has its own bind function then use it. (RAW) */
 440         if (sk->sk_prot->bind) {
 441                 return sk->sk_prot->bind(sk, uaddr, addr_len);
 442         }
 443         if (addr_len < sizeof(struct sockaddr_in))
 444                 return -EINVAL;
 445
 446         /* BPF prog is run before any checks are done so that if the prog
 447          * changes context in a wrong way it will be caught.
 448          */
 449         err = BPF_CGROUP_RUN_PROG_INET4_BIND(sk, uaddr);
 450         if (err)
 451                 return err;
 452
 453         return __inet_bind(sk, uaddr, addr_len, false, true);
 454 }
 455 EXPORT_SYMBOL(inet_bind);
 456
 457 int __inet_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
 458                 bool force_bind_address_no_port, bool with_lock)
 459 {
 460         struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
 461         struct inet_sock *inet = inet_sk(sk);
 462         struct net *net = sock_net(sk);
 463         unsigned short snum;
 464         int chk_addr_ret;
 465         u32 tb_id = RT_TABLE_LOCAL;
 466         int err;
 467
 468         if (addr->sin_family != AF_INET) {
 469                 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET)
 470                  * only if s_addr is INADDR_ANY.
 471                  */
 472                 err = -EAFNOSUPPORT;
 473                 if (addr->sin_family != AF_UNSPEC ||
 474                     addr->sin_addr.s_addr != htonl(INADDR_ANY))
 475                         goto out;
 476         }
 477
 478         tb_id = l3mdev_fib_table_by_index(net, sk->sk_bound_dev_if) ? : tb_id;
 479         chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id);
 480
 481         /* Not specified by any standard per-se, however it breaks too
 482          * many applications when removed.  It is unfortunate since
 483          * allowing applications to make a non-local bind solves
 484          * several problems with systems using dynamic addressing.
 485          * (ie. your servers still start up even if your ISDN link
 486          *  is temporarily down)
 487          */
 488         err = -EADDRNOTAVAIL;
 489         if (!inet_can_nonlocal_bind(net, inet) &&
 490             addr->sin_addr.s_addr != htonl(INADDR_ANY) &&
 491             chk_addr_ret != RTN_LOCAL &&
 492             chk_addr_ret != RTN_MULTICAST &&
 493             chk_addr_ret != RTN_BROADCAST)
 494                 goto out;
 495
 496         snum = ntohs(addr->sin_port);
 497         err = -EACCES;
 498         if (snum && snum < inet_prot_sock(net) &&
 499             !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
 500                 goto out;
 501
 502         /*      We keep a pair of addresses. rcv_saddr is the one
 503          *      used by hash lookups, and saddr is used for transmit.
 504          *
 505          *      In the BSD API these are the same except where it
 506          *      would be illegal to use them (multicast/broadcast) in
 507          *      which case the sending device address is used.
 508          */
 509         if (with_lock)
 510                 lock_sock(sk);
 511
 512         /* Check these errors (active socket, double bind). */
 513         err = -EINVAL;
 514         if (sk->sk_state != TCP_CLOSE || inet->inet_num)
 515                 goto out_release_sock;
 516
 517         inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
 518         if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
 519                 inet->inet_saddr = 0;  /* Use device */
 520
 521         /* Make sure we are allowed to bind here. */
 522         if (snum || !(inet->bind_address_no_port ||
 523                       force_bind_address_no_port)) {
 524                 if (sk->sk_prot->get_port(sk, snum)) {
 525                         inet->inet_saddr = inet->inet_rcv_saddr = 0;
 526                         err = -EADDRINUSE;
 527                         goto out_release_sock;
 528                 }
 529                 err = BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk);
 530                 if (err) {
 531                         inet->inet_saddr = inet->inet_rcv_saddr = 0;
 532                         goto out_release_sock;
 533                 }
 534         }
 535
 536         if (inet->inet_rcv_saddr)
 537                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
 538         if (snum)
 539                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
 540         inet->inet_sport = htons(inet->inet_num);
 541         inet->inet_daddr = 0;
 542         inet->inet_dport = 0;
 543         sk_dst_reset(sk);
 544         err = 0;
 545 out_release_sock:
 546         if (with_lock)
 547                 release_sock(sk);
 548 out:
 549         return err;
 550 }
 551
 552 int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr,
 553                        int addr_len, int flags)
 554 {
 555         struct sock *sk = sock->sk;
 556         int err;
 557
 558         if (addr_len < sizeof(uaddr->sa_family))
 559                 return -EINVAL;
 560         if (uaddr->sa_family == AF_UNSPEC)
 561                 return sk->sk_prot->disconnect(sk, flags);
 562
 563         if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) {
 564                 err = sk->sk_prot->pre_connect(sk, uaddr, addr_len);
 565                 if (err)
 566                         return err;
 567         }
 568
 569         if (!inet_sk(sk)->inet_num && inet_autobind(sk))
 570                 return -EAGAIN;
 571         return sk->sk_prot->connect(sk, uaddr, addr_len);
 572 }
 573 EXPORT_SYMBOL(inet_dgram_connect);
 574
 575 static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias)
 576 {
 577         DEFINE_WAIT_FUNC(wait, woken_wake_function);
 578
 579         add_wait_queue(sk_sleep(sk), &wait);
 580         sk->sk_write_pending += writebias;
 581         sk->sk_wait_pending++;
 582
 583         /* Basic assumption: if someone sets sk->sk_err, he _must_
 584          * change state of the socket from TCP_SYN_*.
 585          * Connect() does not allow to get error notifications
 586          * without closing the socket.
 587          */
 588         while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
 589                 release_sock(sk);
 590                 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
 591                 lock_sock(sk);
 592                 if (signal_pending(current) || !timeo)
 593                         break;
 594         }
 595         remove_wait_queue(sk_sleep(sk), &wait);
 596         sk->sk_write_pending -= writebias;
 597         sk->sk_wait_pending--;
 598         return timeo;
 599 }
 600
 601 /*
 602  *      Connect to a remote host. There is regrettably still a little
 603  *      TCP 'magic' in here.
 604  */
 605 int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
 606                           int addr_len, int flags, int is_sendmsg)
 607 {
 608         struct sock *sk = sock->sk;
 609         int err;
 610         long timeo;
 611
 612         /*
 613          * uaddr can be NULL and addr_len can be 0 if:
 614          * sk is a TCP fastopen active socket and
 615          * TCP_FASTOPEN_CONNECT sockopt is set and
 616          * we already have a valid cookie for this socket.
 617          * In this case, user can call write() after connect().
 618          * write() will invoke tcp_sendmsg_fastopen() which calls
 619          * __inet_stream_connect().
 620          */
 621         if (uaddr) {
 622                 if (addr_len < sizeof(uaddr->sa_family))
 623                         return -EINVAL;
 624
 625                 if (uaddr->sa_family == AF_UNSPEC) {
 626                         err = sk->sk_prot->disconnect(sk, flags);
 627                         sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
 628                         goto out;
 629                 }
 630         }
 631
 632         switch (sock->state) {
 633         default:
 634                 err = -EINVAL;
 635                 goto out;
 636         case SS_CONNECTED:
 637                 err = -EISCONN;
 638                 goto out;
 639         case SS_CONNECTING:
 640                 if (inet_sk(sk)->defer_connect)
 641                         err = is_sendmsg ? -EINPROGRESS : -EISCONN;
 642                 else
 643                         err = -EALREADY;
 644                 /* Fall out of switch with err, set for this state */
 645                 break;
 646         case SS_UNCONNECTED:
 647                 err = -EISCONN;
 648                 if (sk->sk_state != TCP_CLOSE)
 649                         goto out;
 650
 651                 if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) {
 652                         err = sk->sk_prot->pre_connect(sk, uaddr, addr_len);
 653                         if (err)
 654                                 goto out;
 655                 }
 656
 657                 err = sk->sk_prot->connect(sk, uaddr, addr_len);
 658                 if (err < 0)
 659                         goto out;
 660
 661                 sock->state = SS_CONNECTING;
 662
 663                 if (!err && inet_sk(sk)->defer_connect)
 664                         goto out;
 665
 666                 /* Just entered SS_CONNECTING state; the only
 667                  * difference is that return value in non-blocking
 668                  * case is EINPROGRESS, rather than EALREADY.
 669                  */
 670                 err = -EINPROGRESS;
 671                 break;
 672         }
 673
 674         timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
 675
 676         if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
 677                 int writebias = (sk->sk_protocol == IPPROTO_TCP) &&
 678                                 tcp_sk(sk)->fastopen_req &&
 679                                 tcp_sk(sk)->fastopen_req->data ? 1 : 0;
 680
 681                 /* Error code is set above */
 682                 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias))
 683                         goto out;
 684
 685                 err = sock_intr_errno(timeo);
 686                 if (signal_pending(current))
 687                         goto out;
 688         }
 689
 690         /* Connection was closed by RST, timeout, ICMP error
 691          * or another process disconnected us.
 692          */
 693         if (sk->sk_state == TCP_CLOSE)
 694                 goto sock_error;
 695
 696         /* sk->sk_err may be not zero now, if RECVERR was ordered by user
 697          * and error was received after socket entered established state.
 698          * Hence, it is handled normally after connect() return successfully.
 699          */
 700
 701         sock->state = SS_CONNECTED;
 702         err = 0;
 703 out:
 704         return err;
 705
 706 sock_error:
 707         err = sock_error(sk) ? : -ECONNABORTED;
 708         sock->state = SS_UNCONNECTED;
 709         if (sk->sk_prot->disconnect(sk, flags))
 710                 sock->state = SS_DISCONNECTING;
 711         goto out;
 712 }
 713 EXPORT_SYMBOL(__inet_stream_connect);
 714
 715 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
 716                         int addr_len, int flags)
 717 {
 718         int err;
 719
 720         lock_sock(sock->sk);
 721         err = __inet_stream_connect(sock, uaddr, addr_len, flags, 0);
 722         release_sock(sock->sk);
 723         return err;
 724 }
 725 EXPORT_SYMBOL(inet_stream_connect);
 726
 727 /*
 728  *      Accept a pending connection. The TCP layer now gives BSD semantics.
 729  */
 730
 731 int inet_accept(struct socket *sock, struct socket *newsock, int flags,
 732                 bool kern)
 733 {
 734         struct sock *sk1 = sock->sk;
 735         int err = -EINVAL;
 736         struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err, kern);
 737
 738         if (!sk2)
 739                 goto do_err;
 740
 741         lock_sock(sk2);
 742
 743         sock_rps_record_flow(sk2);
 744         WARN_ON(!((1 << sk2->sk_state) &
 745                   (TCPF_ESTABLISHED | TCPF_SYN_RECV |
 746                   TCPF_CLOSE_WAIT | TCPF_CLOSE)));
 747
 748         sock_graft(sk2, newsock);
 749
 750         newsock->state = SS_CONNECTED;
 751         err = 0;
 752         release_sock(sk2);
 753 do_err:
 754         return err;
 755 }
 756 EXPORT_SYMBOL(inet_accept);
 757
 758
 759 /*
 760  *      This does both peername and sockname.
 761  */
 762 int inet_getname(struct socket *sock, struct sockaddr *uaddr,
 763                         int peer)
 764 {
 765         struct sock *sk         = sock->sk;
 766         struct inet_sock *inet  = inet_sk(sk);
 767         DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr);
 768
 769         sin->sin_family = AF_INET;
 770         if (peer) {
 771                 if (!inet->inet_dport ||
 772                     (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
 773                      peer == 1))
 774                         return -ENOTCONN;
 775                 sin->sin_port = inet->inet_dport;
 776                 sin->sin_addr.s_addr = inet->inet_daddr;
 777         } else {
 778                 __be32 addr = inet->inet_rcv_saddr;
 779                 if (!addr)
 780                         addr = inet->inet_saddr;
 781                 sin->sin_port = inet->inet_sport;
 782                 sin->sin_addr.s_addr = addr;
 783         }
 784         memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 785         return sizeof(*sin);
 786 }
 787 EXPORT_SYMBOL(inet_getname);
 788
 789 int inet_send_prepare(struct sock *sk)
 790 {
 791         sock_rps_record_flow(sk);
 792
 793         /* We may need to bind the socket. */
 794         if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
 795             inet_autobind(sk))
 796                 return -EAGAIN;
 797
 798         return 0;
 799 }
 800 EXPORT_SYMBOL_GPL(inet_send_prepare);
 801
 802 int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
 803 {
 804         struct sock *sk = sock->sk;
 805
 806         if (unlikely(inet_send_prepare(sk)))
 807                 return -EAGAIN;
 808
 809         return INDIRECT_CALL_2(sk->sk_prot->sendmsg, tcp_sendmsg, udp_sendmsg,
 810                                sk, msg, size);
 811 }
 812 EXPORT_SYMBOL(inet_sendmsg);
 813
 814 ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset,
 815                       size_t size, int flags)
 816 {
 817         struct sock *sk = sock->sk;
 818
 819         if (unlikely(inet_send_prepare(sk)))
 820                 return -EAGAIN;
 821
 822         if (sk->sk_prot->sendpage)
 823                 return sk->sk_prot->sendpage(sk, page, offset, size, flags);
 824         return sock_no_sendpage(sock, page, offset, size, flags);
 825 }
 826 EXPORT_SYMBOL(inet_sendpage);
 827
 828 INDIRECT_CALLABLE_DECLARE(int udp_recvmsg(struct sock *, struct msghdr *,
 829                                           size_t, int, int, int *));
 830 int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
 831                  int flags)
 832 {
 833         struct sock *sk = sock->sk;
 834         int addr_len = 0;
 835         int err;
 836
 837         if (likely(!(flags & MSG_ERRQUEUE)))
 838                 sock_rps_record_flow(sk);
 839
 840         err = INDIRECT_CALL_2(sk->sk_prot->recvmsg, tcp_recvmsg, udp_recvmsg,
 841                               sk, msg, size, flags & MSG_DONTWAIT,
 842                               flags & ~MSG_DONTWAIT, &addr_len);
 843         if (err >= 0)
 844                 msg->msg_namelen = addr_len;
 845         return err;
 846 }
 847 EXPORT_SYMBOL(inet_recvmsg);
 848
 849 int inet_shutdown(struct socket *sock, int how)
 850 {
 851         struct sock *sk = sock->sk;
 852         int err = 0;
 853
 854         /* This should really check to make sure
 855          * the socket is a TCP socket. (WHY AC...)
 856          */
 857         how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
 858                        1->2 bit 2 snds.
 859                        2->3 */
 860         if ((how & ~SHUTDOWN_MASK) || !how)     /* MAXINT->0 */
 861                 return -EINVAL;
 862
 863         lock_sock(sk);
 864         if (sock->state == SS_CONNECTING) {
 865                 if ((1 << sk->sk_state) &
 866                     (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
 867                         sock->state = SS_DISCONNECTING;
 868                 else
 869                         sock->state = SS_CONNECTED;
 870         }
 871
 872         switch (sk->sk_state) {
 873         case TCP_CLOSE:
 874                 err = -ENOTCONN;
 875                 /* Hack to wake up other listeners, who can poll for
 876                    EPOLLHUP, even on eg. unconnected UDP sockets -- RR */
 877                 /* fall through */
 878         default:
 879                 sk->sk_shutdown |= how;
 880                 if (sk->sk_prot->shutdown)
 881                         sk->sk_prot->shutdown(sk, how);
 882                 break;
 883
 884         /* Remaining two branches are temporary solution for missing
 885          * close() in multithreaded environment. It is _not_ a good idea,
 886          * but we have no choice until close() is repaired at VFS level.
 887          */
 888         case TCP_LISTEN:
 889                 if (!(how & RCV_SHUTDOWN))
 890                         break;
 891                 /* fall through */
 892         case TCP_SYN_SENT:
 893                 err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
 894                 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
 895                 break;
 896         }
 897
 898         /* Wake up anyone sleeping in poll. */
 899         sk->sk_state_change(sk);
 900         release_sock(sk);
 901         return err;
 902 }
 903 EXPORT_SYMBOL(inet_shutdown);
 904
 905 /*
 906  *      ioctl() calls you can issue on an INET socket. Most of these are
 907  *      device configuration and stuff and very rarely used. Some ioctls
 908  *      pass on to the socket itself.
 909  *
 910  *      NOTE: I like the idea of a module for the config stuff. ie ifconfig
 911  *      loads the devconfigure module does its configuring and unloads it.
 912  *      There's a good 20K of config code hanging around the kernel.
 913  */
 914
 915 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 916 {
 917         struct sock *sk = sock->sk;
 918         int err = 0;
 919         struct net *net = sock_net(sk);
 920         void __user *p = (void __user *)arg;
 921         struct ifreq ifr;
 922         struct rtentry rt;
 923
 924         switch (cmd) {
 925         case SIOCADDRT:
 926         case SIOCDELRT:
 927                 if (copy_from_user(&rt, p, sizeof(struct rtentry)))
 928                         return -EFAULT;
 929                 err = ip_rt_ioctl(net, cmd, &rt);
 930                 break;
 931         case SIOCRTMSG:
 932                 err = -EINVAL;
 933                 break;
 934         case SIOCDARP:
 935         case SIOCGARP:
 936         case SIOCSARP:
 937                 err = arp_ioctl(net, cmd, (void __user *)arg);
 938                 break;
 939         case SIOCGIFADDR:
 940         case SIOCGIFBRDADDR:
 941         case SIOCGIFNETMASK:
 942         case SIOCGIFDSTADDR:
 943         case SIOCGIFPFLAGS:
 944                 if (copy_from_user(&ifr, p, sizeof(struct ifreq)))
 945                         return -EFAULT;
 946                 err = devinet_ioctl(net, cmd, &ifr);
 947                 if (!err && copy_to_user(p, &ifr, sizeof(struct ifreq)))
 948                         err = -EFAULT;
 949                 break;
 950
 951         case SIOCSIFADDR:
 952         case SIOCSIFBRDADDR:
 953         case SIOCSIFNETMASK:
 954         case SIOCSIFDSTADDR:
 955         case SIOCSIFPFLAGS:
 956         case SIOCSIFFLAGS:
 957                 if (copy_from_user(&ifr, p, sizeof(struct ifreq)))
 958                         return -EFAULT;
 959                 err = devinet_ioctl(net, cmd, &ifr);
 960                 break;
 961         default:
 962                 if (sk->sk_prot->ioctl)
 963                         err = sk->sk_prot->ioctl(sk, cmd, arg);
 964                 else
 965                         err = -ENOIOCTLCMD;
 966                 break;
 967         }
 968         return err;
 969 }
 970 EXPORT_SYMBOL(inet_ioctl);
 971
 972 #ifdef CONFIG_COMPAT
 973 static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 974 {
 975         struct sock *sk = sock->sk;
 976         int err = -ENOIOCTLCMD;
 977
 978         if (sk->sk_prot->compat_ioctl)
 979                 err = sk->sk_prot->compat_ioctl(sk, cmd, arg);
 980
 981         return err;
 982 }
 983 #endif
 984
 985 const struct proto_ops inet_stream_ops = {
 986         .family            = PF_INET,
 987         .owner             = THIS_MODULE,
 988         .release           = inet_release,
 989         .bind              = inet_bind,
 990         .connect           = inet_stream_connect,
 991         .socketpair        = sock_no_socketpair,
 992         .accept            = inet_accept,
 993         .getname           = inet_getname,
 994         .poll              = tcp_poll,
 995         .ioctl             = inet_ioctl,
 996         .gettstamp         = sock_gettstamp,
 997         .listen            = inet_listen,
 998         .shutdown          = inet_shutdown,
 999         .setsockopt        = sock_common_setsockopt,
1000         .getsockopt        = sock_common_getsockopt,
1001         .sendmsg           = inet_sendmsg,
1002         .recvmsg           = inet_recvmsg,
1003 #ifdef CONFIG_MMU
1004         .mmap              = tcp_mmap,
1005 #endif
1006         .sendpage          = inet_sendpage,
1007         .splice_read       = tcp_splice_read,
1008         .read_sock         = tcp_read_sock,
1009         .sendmsg_locked    = tcp_sendmsg_locked,
1010         .sendpage_locked   = tcp_sendpage_locked,
1011         .peek_len          = tcp_peek_len,
1012 #ifdef CONFIG_COMPAT
1013         .compat_setsockopt = compat_sock_common_setsockopt,
1014         .compat_getsockopt = compat_sock_common_getsockopt,
1015         .compat_ioctl      = inet_compat_ioctl,
1016 #endif
1017         .set_rcvlowat      = tcp_set_rcvlowat,
1018 };
1019 EXPORT_SYMBOL(inet_stream_ops);
1020
1021 const struct proto_ops inet_dgram_ops = {
1022         .family            = PF_INET,
1023         .owner             = THIS_MODULE,
1024         .release           = inet_release,
1025         .bind              = inet_bind,
1026         .connect           = inet_dgram_connect,
1027         .socketpair        = sock_no_socketpair,
1028         .accept            = sock_no_accept,
1029         .getname           = inet_getname,
1030         .poll              = udp_poll,
1031         .ioctl             = inet_ioctl,
1032         .gettstamp         = sock_gettstamp,
1033         .listen            = sock_no_listen,
1034         .shutdown          = inet_shutdown,
1035         .setsockopt        = sock_common_setsockopt,
1036         .getsockopt        = sock_common_getsockopt,
1037         .sendmsg           = inet_sendmsg,
1038         .recvmsg           = inet_recvmsg,
1039         .mmap              = sock_no_mmap,
1040         .sendpage          = inet_sendpage,
1041         .set_peek_off      = sk_set_peek_off,
1042 #ifdef CONFIG_COMPAT
1043         .compat_setsockopt = compat_sock_common_setsockopt,
1044         .compat_getsockopt = compat_sock_common_getsockopt,
1045         .compat_ioctl      = inet_compat_ioctl,
1046 #endif
1047 };
1048 EXPORT_SYMBOL(inet_dgram_ops);
1049
1050 /*
1051  * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
1052  * udp_poll
1053  */
1054 static const struct proto_ops inet_sockraw_ops = {
1055         .family            = PF_INET,
1056         .owner             = THIS_MODULE,
1057         .release           = inet_release,
1058         .bind              = inet_bind,
1059         .connect           = inet_dgram_connect,
1060         .socketpair        = sock_no_socketpair,
1061         .accept            = sock_no_accept,
1062         .getname           = inet_getname,
1063         .poll              = datagram_poll,
1064         .ioctl             = inet_ioctl,
1065         .gettstamp         = sock_gettstamp,
1066         .listen            = sock_no_listen,
1067         .shutdown          = inet_shutdown,
1068         .setsockopt        = sock_common_setsockopt,
1069         .getsockopt        = sock_common_getsockopt,
1070         .sendmsg           = inet_sendmsg,
1071         .recvmsg           = inet_recvmsg,
1072         .mmap              = sock_no_mmap,
1073         .sendpage          = inet_sendpage,
1074 #ifdef CONFIG_COMPAT
1075         .compat_setsockopt = compat_sock_common_setsockopt,
1076         .compat_getsockopt = compat_sock_common_getsockopt,
1077         .compat_ioctl      = inet_compat_ioctl,
1078 #endif
1079 };
1080
1081 static const struct net_proto_family inet_family_ops = {
1082         .family = PF_INET,
1083         .create = inet_create,
1084         .owner  = THIS_MODULE,
1085 };
1086
1087 /* Upon startup we insert all the elements in inetsw_array[] into
1088  * the linked list inetsw.
1089  */
1090 static struct inet_protosw inetsw_array[] =
1091 {
1092         {
1093                 .type =       SOCK_STREAM,
1094                 .protocol =   IPPROTO_TCP,
1095                 .prot =       &tcp_prot,
1096                 .ops =        &inet_stream_ops,
1097                 .flags =      INET_PROTOSW_PERMANENT |
1098                               INET_PROTOSW_ICSK,
1099         },
1100
1101         {
1102                 .type =       SOCK_DGRAM,
1103                 .protocol =   IPPROTO_UDP,
1104                 .prot =       &udp_prot,
1105                 .ops =        &inet_dgram_ops,
1106                 .flags =      INET_PROTOSW_PERMANENT,
1107        },
1108
1109        {
1110                 .type =       SOCK_DGRAM,
1111                 .protocol =   IPPROTO_ICMP,
1112                 .prot =       &ping_prot,
1113                 .ops =        &inet_sockraw_ops,
1114                 .flags =      INET_PROTOSW_REUSE,
1115        },
1116
1117        {
1118                .type =       SOCK_RAW,
1119                .protocol =   IPPROTO_IP,        /* wild card */
1120                .prot =       &raw_prot,
1121                .ops =        &inet_sockraw_ops,
1122                .flags =      INET_PROTOSW_REUSE,
1123        }
1124 };
1125
1126 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
1127
1128 void inet_register_protosw(struct inet_protosw *p)
1129 {
1130         struct list_head *lh;
1131         struct inet_protosw *answer;
1132         int protocol = p->protocol;
1133         struct list_head *last_perm;
1134
1135         spin_lock_bh(&inetsw_lock);
1136
1137         if (p->type >= SOCK_MAX)
1138                 goto out_illegal;
1139
1140         /* If we are trying to override a permanent protocol, bail. */
1141         last_perm = &inetsw[p->type];
1142         list_for_each(lh, &inetsw[p->type]) {
1143                 answer = list_entry(lh, struct inet_protosw, list);
1144                 /* Check only the non-wild match. */
1145                 if ((INET_PROTOSW_PERMANENT & answer->flags) == 0)
1146                         break;
1147                 if (protocol == answer->protocol)
1148                         goto out_permanent;
1149                 last_perm = lh;
1150         }
1151
1152         /* Add the new entry after the last permanent entry if any, so that
1153          * the new entry does not override a permanent entry when matched with
1154          * a wild-card protocol. But it is allowed to override any existing
1155          * non-permanent entry.  This means that when we remove this entry, the
1156          * system automatically returns to the old behavior.
1157          */
1158         list_add_rcu(&p->list, last_perm);
1159 out:
1160         spin_unlock_bh(&inetsw_lock);
1161
1162         return;
1163
1164 out_permanent:
1165         pr_err("Attempt to override permanent protocol %d\n", protocol);
1166         goto out;
1167
1168 out_illegal:
1169         pr_err("Ignoring attempt to register invalid socket type %d\n",
1170                p->type);
1171         goto out;
1172 }
1173 EXPORT_SYMBOL(inet_register_protosw);
1174
1175 void inet_unregister_protosw(struct inet_protosw *p)
1176 {
1177         if (INET_PROTOSW_PERMANENT & p->flags) {
1178                 pr_err("Attempt to unregister permanent protocol %d\n",
1179                        p->protocol);
1180         } else {
1181                 spin_lock_bh(&inetsw_lock);
1182                 list_del_rcu(&p->list);
1183                 spin_unlock_bh(&inetsw_lock);
1184
1185                 synchronize_net();
1186         }
1187 }
1188 EXPORT_SYMBOL(inet_unregister_protosw);
1189
1190 static int inet_sk_reselect_saddr(struct sock *sk)
1191 {
1192         struct inet_sock *inet = inet_sk(sk);
1193         __be32 old_saddr = inet->inet_saddr;
1194         __be32 daddr = inet->inet_daddr;
1195         struct flowi4 *fl4;
1196         struct rtable *rt;
1197         __be32 new_saddr;
1198         struct ip_options_rcu *inet_opt;
1199
1200         inet_opt = rcu_dereference_protected(inet->inet_opt,
1201                                              lockdep_sock_is_held(sk));
1202         if (inet_opt && inet_opt->opt.srr)
1203                 daddr = inet_opt->opt.faddr;
1204
1205         /* Query new route. */
1206         fl4 = &inet->cork.fl.u.ip4;
1207         rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk),
1208                               sk->sk_bound_dev_if, sk->sk_protocol,
1209                               inet->inet_sport, inet->inet_dport, sk);
1210         if (IS_ERR(rt))
1211                 return PTR_ERR(rt);
1212
1213         sk_setup_caps(sk, &rt->dst);
1214
1215         new_saddr = fl4->saddr;
1216
1217         if (new_saddr == old_saddr)
1218                 return 0;
1219
1220         if (READ_ONCE(sock_net(sk)->ipv4.sysctl_ip_dynaddr) > 1) {
1221                 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n",
1222                         __func__, &old_saddr, &new_saddr);
1223         }
1224
1225         inet->inet_saddr = inet->inet_rcv_saddr = new_saddr;
1226
1227         /*
1228          * XXX The only one ugly spot where we need to
1229          * XXX really change the sockets identity after
1230          * XXX it has entered the hashes. -DaveM
1231          *
1232          * Besides that, it does not check for connection
1233          * uniqueness. Wait for troubles.
1234          */
1235         return __sk_prot_rehash(sk);
1236 }
1237
1238 int inet_sk_rebuild_header(struct sock *sk)
1239 {
1240         struct inet_sock *inet = inet_sk(sk);
1241         struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0);
1242         __be32 daddr;
1243         struct ip_options_rcu *inet_opt;
1244         struct flowi4 *fl4;
1245         int err;
1246
1247         /* Route is OK, nothing to do. */
1248         if (rt)
1249                 return 0;
1250
1251         /* Reroute. */
1252         rcu_read_lock();
1253         inet_opt = rcu_dereference(inet->inet_opt);
1254         daddr = inet->inet_daddr;
1255         if (inet_opt && inet_opt->opt.srr)
1256                 daddr = inet_opt->opt.faddr;
1257         rcu_read_unlock();
1258         fl4 = &inet->cork.fl.u.ip4;
1259         rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr,
1260                                    inet->inet_dport, inet->inet_sport,
1261                                    sk->sk_protocol, RT_CONN_FLAGS(sk),
1262                                    sk->sk_bound_dev_if);
1263         if (!IS_ERR(rt)) {
1264                 err = 0;
1265                 sk_setup_caps(sk, &rt->dst);
1266         } else {
1267                 err = PTR_ERR(rt);
1268
1269                 /* Routing failed... */
1270                 sk->sk_route_caps = 0;
1271                 /*
1272                  * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1273                  * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1274                  */
1275                 if (!READ_ONCE(sock_net(sk)->ipv4.sysctl_ip_dynaddr) ||
1276                     sk->sk_state != TCP_SYN_SENT ||
1277                     (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
1278                     (err = inet_sk_reselect_saddr(sk)) != 0)
1279                         sk->sk_err_soft = -err;
1280         }
1281
1282         return err;
1283 }
1284 EXPORT_SYMBOL(inet_sk_rebuild_header);
1285
1286 void inet_sk_set_state(struct sock *sk, int state)
1287 {
1288         trace_inet_sock_set_state(sk, sk->sk_state, state);
1289         sk->sk_state = state;
1290 }
1291 EXPORT_SYMBOL(inet_sk_set_state);
1292
1293 void inet_sk_state_store(struct sock *sk, int newstate)
1294 {
1295         trace_inet_sock_set_state(sk, sk->sk_state, newstate);
1296         smp_store_release(&sk->sk_state, newstate);
1297 }
1298
1299 struct sk_buff *inet_gso_segment(struct sk_buff *skb,
1300                                  netdev_features_t features)
1301 {
1302         bool udpfrag = false, fixedid = false, gso_partial, encap;
1303         struct sk_buff *segs = ERR_PTR(-EINVAL);
1304         const struct net_offload *ops;
1305         unsigned int offset = 0;
1306         struct iphdr *iph;
1307         int proto, tot_len;
1308         int nhoff;
1309         int ihl;
1310         int id;
1311
1312         skb_reset_network_header(skb);
1313         nhoff = skb_network_header(skb) - skb_mac_header(skb);
1314         if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1315                 goto out;
1316
1317         iph = ip_hdr(skb);
1318         ihl = iph->ihl * 4;
1319         if (ihl < sizeof(*iph))
1320                 goto out;
1321
1322         id = ntohs(iph->id);
1323         proto = iph->protocol;
1324
1325         /* Warning: after this point, iph might be no longer valid */
1326         if (unlikely(!pskb_may_pull(skb, ihl)))
1327                 goto out;
1328         __skb_pull(skb, ihl);
1329
1330         encap = SKB_GSO_CB(skb)->encap_level > 0;
1331         if (encap)
1332                 features &= skb->dev->hw_enc_features;
1333         SKB_GSO_CB(skb)->encap_level += ihl;
1334
1335         skb_reset_transport_header(skb);
1336
1337         segs = ERR_PTR(-EPROTONOSUPPORT);
1338
1339         if (!skb->encapsulation || encap) {
1340                 udpfrag = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP);
1341                 fixedid = !!(skb_shinfo(skb)->gso_type & SKB_GSO_TCP_FIXEDID);
1342
1343                 /* fixed ID is invalid if DF bit is not set */
1344                 if (fixedid && !(ip_hdr(skb)->frag_off & htons(IP_DF)))
1345                         goto out;
1346         }
1347
1348         ops = rcu_dereference(inet_offloads[proto]);
1349         if (likely(ops && ops->callbacks.gso_segment)) {
1350                 segs = ops->callbacks.gso_segment(skb, features);
1351                 if (!segs)
1352                         skb->network_header = skb_mac_header(skb) + nhoff - skb->head;
1353         }
1354
1355         if (IS_ERR_OR_NULL(segs))
1356                 goto out;
1357
1358         gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL);
1359
1360         skb = segs;
1361         do {
1362                 iph = (struct iphdr *)(skb_mac_header(skb) + nhoff);
1363                 if (udpfrag) {
1364                         iph->frag_off = htons(offset >> 3);
1365                         if (skb->next)
1366                                 iph->frag_off |= htons(IP_MF);
1367                         offset += skb->len - nhoff - ihl;
1368                         tot_len = skb->len - nhoff;
1369                 } else if (skb_is_gso(skb)) {
1370                         if (!fixedid) {
1371                                 iph->id = htons(id);
1372                                 id += skb_shinfo(skb)->gso_segs;
1373                         }
1374
1375                         if (gso_partial)
1376                                 tot_len = skb_shinfo(skb)->gso_size +
1377                                           SKB_GSO_CB(skb)->data_offset +
1378                                           skb->head - (unsigned char *)iph;
1379                         else
1380                                 tot_len = skb->len - nhoff;
1381                 } else {
1382                         if (!fixedid)
1383                                 iph->id = htons(id++);
1384                         tot_len = skb->len - nhoff;
1385                 }
1386                 iph->tot_len = htons(tot_len);
1387                 ip_send_check(iph);
1388                 if (encap)
1389                         skb_reset_inner_headers(skb);
1390                 skb->network_header = (u8 *)iph - skb->head;
1391                 skb_reset_mac_len(skb);
1392         } while ((skb = skb->next));
1393
1394 out:
1395         return segs;
1396 }
1397 EXPORT_SYMBOL(inet_gso_segment);
1398
1399 static struct sk_buff *ipip_gso_segment(struct sk_buff *skb,
1400                                         netdev_features_t features)
1401 {
1402         if (!(skb_shinfo(skb)->gso_type & SKB_GSO_IPXIP4))
1403                 return ERR_PTR(-EINVAL);
1404
1405         return inet_gso_segment(skb, features);
1406 }
1407
1408 INDIRECT_CALLABLE_DECLARE(struct sk_buff *tcp4_gro_receive(struct list_head *,
1409                                                            struct sk_buff *));
1410 INDIRECT_CALLABLE_DECLARE(struct sk_buff *udp4_gro_receive(struct list_head *,
1411                                                            struct sk_buff *));
1412 struct sk_buff *inet_gro_receive(struct list_head *head, struct sk_buff *skb)
1413 {
1414         const struct net_offload *ops;
1415         struct sk_buff *pp = NULL;
1416         const struct iphdr *iph;
1417         struct sk_buff *p;
1418         unsigned int hlen;
1419         unsigned int off;
1420         unsigned int id;
1421         int flush = 1;
1422         int proto;
1423
1424         off = skb_gro_offset(skb);
1425         hlen = off + sizeof(*iph);
1426         iph = skb_gro_header_fast(skb, off);
1427         if (skb_gro_header_hard(skb, hlen)) {
1428                 iph = skb_gro_header_slow(skb, hlen, off);
1429                 if (unlikely(!iph))
1430                         goto out;
1431         }
1432
1433         proto = iph->protocol;
1434
1435         rcu_read_lock();
1436         ops = rcu_dereference(inet_offloads[proto]);
1437         if (!ops || !ops->callbacks.gro_receive)
1438                 goto out_unlock;
1439
1440         if (*(u8 *)iph != 0x45)
1441                 goto out_unlock;
1442
1443         if (ip_is_fragment(iph))
1444                 goto out_unlock;
1445
1446         if (unlikely(ip_fast_csum((u8 *)iph, 5)))
1447                 goto out_unlock;
1448
1449         id = ntohl(*(__be32 *)&iph->id);
1450         flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF));
1451         id >>= 16;
1452
1453         list_for_each_entry(p, head, list) {
1454                 struct iphdr *iph2;
1455                 u16 flush_id;
1456
1457                 if (!NAPI_GRO_CB(p)->same_flow)
1458                         continue;
1459
1460                 iph2 = (struct iphdr *)(p->data + off);
1461                 /* The above works because, with the exception of the top
1462                  * (inner most) layer, we only aggregate pkts with the same
1463                  * hdr length so all the hdrs we'll need to verify will start
1464                  * at the same offset.
1465                  */
1466                 if ((iph->protocol ^ iph2->protocol) |
1467                     ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) |
1468                     ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) {
1469                         NAPI_GRO_CB(p)->same_flow = 0;
1470                         continue;
1471                 }
1472
1473                 /* All fields must match except length and checksum. */
1474                 NAPI_GRO_CB(p)->flush |=
1475                         (iph->ttl ^ iph2->ttl) |
1476                         (iph->tos ^ iph2->tos) |
1477                         ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF));
1478
1479                 NAPI_GRO_CB(p)->flush |= flush;
1480
1481                 /* We need to store of the IP ID check to be included later
1482                  * when we can verify that this packet does in fact belong
1483                  * to a given flow.
1484                  */
1485                 flush_id = (u16)(id - ntohs(iph2->id));
1486
1487                 /* This bit of code makes it much easier for us to identify
1488                  * the cases where we are doing atomic vs non-atomic IP ID
1489                  * checks.  Specifically an atomic check can return IP ID
1490                  * values 0 - 0xFFFF, while a non-atomic check can only
1491                  * return 0 or 0xFFFF.
1492                  */
1493                 if (!NAPI_GRO_CB(p)->is_atomic ||
1494                     !(iph->frag_off & htons(IP_DF))) {
1495                         flush_id ^= NAPI_GRO_CB(p)->count;
1496                         flush_id = flush_id ? 0xFFFF : 0;
1497                 }
1498
1499                 /* If the previous IP ID value was based on an atomic
1500                  * datagram we can overwrite the value and ignore it.
1501                  */
1502                 if (NAPI_GRO_CB(skb)->is_atomic)
1503                         NAPI_GRO_CB(p)->flush_id = flush_id;
1504                 else
1505                         NAPI_GRO_CB(p)->flush_id |= flush_id;
1506         }
1507
1508         NAPI_GRO_CB(skb)->is_atomic = !!(iph->frag_off & htons(IP_DF));
1509         NAPI_GRO_CB(skb)->flush |= flush;
1510         skb_set_network_header(skb, off);
1511         /* The above will be needed by the transport layer if there is one
1512          * immediately following this IP hdr.
1513          */
1514
1515         /* Note : No need to call skb_gro_postpull_rcsum() here,
1516          * as we already checked checksum over ipv4 header was 0
1517          */
1518         skb_gro_pull(skb, sizeof(*iph));
1519         skb_set_transport_header(skb, skb_gro_offset(skb));
1520
1521         pp = indirect_call_gro_receive(tcp4_gro_receive, udp4_gro_receive,
1522                                        ops->callbacks.gro_receive, head, skb);
1523
1524 out_unlock:
1525         rcu_read_unlock();
1526
1527 out:
1528         skb_gro_flush_final(skb, pp, flush);
1529
1530         return pp;
1531 }
1532 EXPORT_SYMBOL(inet_gro_receive);
1533
1534 static struct sk_buff *ipip_gro_receive(struct list_head *head,
1535                                         struct sk_buff *skb)
1536 {
1537         if (NAPI_GRO_CB(skb)->encap_mark) {
1538                 NAPI_GRO_CB(skb)->flush = 1;
1539                 return NULL;
1540         }
1541
1542         NAPI_GRO_CB(skb)->encap_mark = 1;
1543
1544         return inet_gro_receive(head, skb);
1545 }
1546
1547 #define SECONDS_PER_DAY 86400
1548
1549 /* inet_current_timestamp - Return IP network timestamp
1550  *
1551  * Return milliseconds since midnight in network byte order.
1552  */
1553 __be32 inet_current_timestamp(void)
1554 {
1555         u32 secs;
1556         u32 msecs;
1557         struct timespec64 ts;
1558
1559         ktime_get_real_ts64(&ts);
1560
1561         /* Get secs since midnight. */
1562         (void)div_u64_rem(ts.tv_sec, SECONDS_PER_DAY, &secs);
1563         /* Convert to msecs. */
1564         msecs = secs * MSEC_PER_SEC;
1565         /* Convert nsec to msec. */
1566         msecs += (u32)ts.tv_nsec / NSEC_PER_MSEC;
1567
1568         /* Convert to network byte order. */
1569         return htonl(msecs);
1570 }
1571 EXPORT_SYMBOL(inet_current_timestamp);
1572
1573 int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
1574 {
1575         if (sk->sk_family == AF_INET)
1576                 return ip_recv_error(sk, msg, len, addr_len);
1577 #if IS_ENABLED(CONFIG_IPV6)
1578         if (sk->sk_family == AF_INET6)
1579                 return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len);
1580 #endif
1581         return -EINVAL;
1582 }
1583
1584 INDIRECT_CALLABLE_DECLARE(int tcp4_gro_complete(struct sk_buff *, int));
1585 INDIRECT_CALLABLE_DECLARE(int udp4_gro_complete(struct sk_buff *, int));
1586 int inet_gro_complete(struct sk_buff *skb, int nhoff)
1587 {
1588         __be16 newlen = htons(skb->len - nhoff);
1589         struct iphdr *iph = (struct iphdr *)(skb->data + nhoff);
1590         const struct net_offload *ops;
1591         int proto = iph->protocol;
1592         int err = -ENOSYS;
1593
1594         if (skb->encapsulation) {
1595                 skb_set_inner_protocol(skb, cpu_to_be16(ETH_P_IP));
1596                 skb_set_inner_network_header(skb, nhoff);
1597         }
1598
1599         csum_replace2(&iph->check, iph->tot_len, newlen);
1600         iph->tot_len = newlen;
1601
1602         rcu_read_lock();
1603         ops = rcu_dereference(inet_offloads[proto]);
1604         if (WARN_ON(!ops || !ops->callbacks.gro_complete))
1605                 goto out_unlock;
1606
1607         /* Only need to add sizeof(*iph) to get to the next hdr below
1608          * because any hdr with option will have been flushed in
1609          * inet_gro_receive().
1610          */
1611         err = INDIRECT_CALL_2(ops->callbacks.gro_complete,
1612                               tcp4_gro_complete, udp4_gro_complete,
1613                               skb, nhoff + sizeof(*iph));
1614
1615 out_unlock:
1616         rcu_read_unlock();
1617
1618         return err;
1619 }
1620 EXPORT_SYMBOL(inet_gro_complete);
1621
1622 static int ipip_gro_complete(struct sk_buff *skb, int nhoff)
1623 {
1624         skb->encapsulation = 1;
1625         skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4;
1626         return inet_gro_complete(skb, nhoff);
1627 }
1628
1629 int inet_ctl_sock_create(struct sock **sk, unsigned short family,
1630                          unsigned short type, unsigned char protocol,
1631                          struct net *net)
1632 {
1633         struct socket *sock;
1634         int rc = sock_create_kern(net, family, type, protocol, &sock);
1635
1636         if (rc == 0) {
1637                 *sk = sock->sk;
1638                 (*sk)->sk_allocation = GFP_ATOMIC;
1639                 /*
1640                  * Unhash it so that IP input processing does not even see it,
1641                  * we do not wish this socket to see incoming packets.
1642                  */
1643                 (*sk)->sk_prot->unhash(*sk);
1644         }
1645         return rc;
1646 }
1647 EXPORT_SYMBOL_GPL(inet_ctl_sock_create);
1648
1649 u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offt)
1650 {
1651         return  *(((unsigned long *)per_cpu_ptr(mib, cpu)) + offt);
1652 }
1653 EXPORT_SYMBOL_GPL(snmp_get_cpu_field);
1654
1655 unsigned long snmp_fold_field(void __percpu *mib, int offt)
1656 {
1657         unsigned long res = 0;
1658         int i;
1659
1660         for_each_possible_cpu(i)
1661                 res += snmp_get_cpu_field(mib, i, offt);
1662         return res;
1663 }
1664 EXPORT_SYMBOL_GPL(snmp_fold_field);
1665
1666 #if BITS_PER_LONG==32
1667
1668 u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offt,
1669                          size_t syncp_offset)
1670 {
1671         void *bhptr;
1672         struct u64_stats_sync *syncp;
1673         u64 v;
1674         unsigned int start;
1675
1676         bhptr = per_cpu_ptr(mib, cpu);
1677         syncp = (struct u64_stats_sync *)(bhptr + syncp_offset);
1678         do {
1679                 start = u64_stats_fetch_begin_irq(syncp);
1680                 v = *(((u64 *)bhptr) + offt);
1681         } while (u64_stats_fetch_retry_irq(syncp, start));
1682
1683         return v;
1684 }
1685 EXPORT_SYMBOL_GPL(snmp_get_cpu_field64);
1686
1687 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset)
1688 {
1689         u64 res = 0;
1690         int cpu;
1691
1692         for_each_possible_cpu(cpu) {
1693                 res += snmp_get_cpu_field64(mib, cpu, offt, syncp_offset);
1694         }
1695         return res;
1696 }
1697 EXPORT_SYMBOL_GPL(snmp_fold_field64);
1698 #endif
1699
1700 #ifdef CONFIG_IP_MULTICAST
1701 static const struct net_protocol igmp_protocol = {
1702         .handler =      igmp_rcv,
1703         .netns_ok =     1,
1704 };
1705 #endif
1706
1707 static const struct net_protocol tcp_protocol = {
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 static const struct net_protocol udp_protocol = {
1716         .handler =      udp_rcv,
1717         .err_handler =  udp_err,
1718         .no_policy =    1,
1719         .netns_ok =     1,
1720 };
1721
1722 static const struct net_protocol icmp_protocol = {
1723         .handler =      icmp_rcv,
1724         .err_handler =  icmp_err,
1725         .no_policy =    1,
1726         .netns_ok =     1,
1727 };
1728
1729 static __net_init int ipv4_mib_init_net(struct net *net)
1730 {
1731         int i;
1732
1733         net->mib.tcp_statistics = alloc_percpu(struct tcp_mib);
1734         if (!net->mib.tcp_statistics)
1735                 goto err_tcp_mib;
1736         net->mib.ip_statistics = alloc_percpu(struct ipstats_mib);
1737         if (!net->mib.ip_statistics)
1738                 goto err_ip_mib;
1739
1740         for_each_possible_cpu(i) {
1741                 struct ipstats_mib *af_inet_stats;
1742                 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i);
1743                 u64_stats_init(&af_inet_stats->syncp);
1744         }
1745
1746         net->mib.net_statistics = alloc_percpu(struct linux_mib);
1747         if (!net->mib.net_statistics)
1748                 goto err_net_mib;
1749         net->mib.udp_statistics = alloc_percpu(struct udp_mib);
1750         if (!net->mib.udp_statistics)
1751                 goto err_udp_mib;
1752         net->mib.udplite_statistics = alloc_percpu(struct udp_mib);
1753         if (!net->mib.udplite_statistics)
1754                 goto err_udplite_mib;
1755         net->mib.icmp_statistics = alloc_percpu(struct icmp_mib);
1756         if (!net->mib.icmp_statistics)
1757                 goto err_icmp_mib;
1758         net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib),
1759                                               GFP_KERNEL);
1760         if (!net->mib.icmpmsg_statistics)
1761                 goto err_icmpmsg_mib;
1762
1763         tcp_mib_init(net);
1764         return 0;
1765
1766 err_icmpmsg_mib:
1767         free_percpu(net->mib.icmp_statistics);
1768 err_icmp_mib:
1769         free_percpu(net->mib.udplite_statistics);
1770 err_udplite_mib:
1771         free_percpu(net->mib.udp_statistics);
1772 err_udp_mib:
1773         free_percpu(net->mib.net_statistics);
1774 err_net_mib:
1775         free_percpu(net->mib.ip_statistics);
1776 err_ip_mib:
1777         free_percpu(net->mib.tcp_statistics);
1778 err_tcp_mib:
1779         return -ENOMEM;
1780 }
1781
1782 static __net_exit void ipv4_mib_exit_net(struct net *net)
1783 {
1784         kfree(net->mib.icmpmsg_statistics);
1785         free_percpu(net->mib.icmp_statistics);
1786         free_percpu(net->mib.udplite_statistics);
1787         free_percpu(net->mib.udp_statistics);
1788         free_percpu(net->mib.net_statistics);
1789         free_percpu(net->mib.ip_statistics);
1790         free_percpu(net->mib.tcp_statistics);
1791 }
1792
1793 static __net_initdata struct pernet_operations ipv4_mib_ops = {
1794         .init = ipv4_mib_init_net,
1795         .exit = ipv4_mib_exit_net,
1796 };
1797
1798 static int __init init_ipv4_mibs(void)
1799 {
1800         return register_pernet_subsys(&ipv4_mib_ops);
1801 }
1802
1803 static __net_init int inet_init_net(struct net *net)
1804 {
1805         /*
1806          * Set defaults for local port range
1807          */
1808         seqlock_init(&net->ipv4.ip_local_ports.lock);
1809         net->ipv4.ip_local_ports.range[0] =  32768;
1810         net->ipv4.ip_local_ports.range[1] =  60999;
1811
1812         seqlock_init(&net->ipv4.ping_group_range.lock);
1813         /*
1814          * Sane defaults - nobody may create ping sockets.
1815          * Boot scripts should set this to distro-specific group.
1816          */
1817         net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1);
1818         net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0);
1819
1820         /* Default values for sysctl-controlled parameters.
1821          * We set them here, in case sysctl is not compiled.
1822          */
1823         net->ipv4.sysctl_ip_default_ttl = IPDEFTTL;
1824         net->ipv4.sysctl_ip_fwd_update_priority = 1;
1825         net->ipv4.sysctl_ip_dynaddr = 0;
1826         net->ipv4.sysctl_ip_early_demux = 1;
1827         net->ipv4.sysctl_udp_early_demux = 1;
1828         net->ipv4.sysctl_tcp_early_demux = 1;
1829 #ifdef CONFIG_SYSCTL
1830         net->ipv4.sysctl_ip_prot_sock = PROT_SOCK;
1831 #endif
1832
1833         /* Some igmp sysctl, whose values are always used */
1834         net->ipv4.sysctl_igmp_max_memberships = 20;
1835         net->ipv4.sysctl_igmp_max_msf = 10;
1836         /* IGMP reports for link-local multicast groups are enabled by default */
1837         net->ipv4.sysctl_igmp_llm_reports = 1;
1838         net->ipv4.sysctl_igmp_qrv = 2;
1839
1840         return 0;
1841 }
1842
1843 static __net_initdata struct pernet_operations af_inet_ops = {
1844         .init = inet_init_net,
1845 };
1846
1847 static int __init init_inet_pernet_ops(void)
1848 {
1849         return register_pernet_subsys(&af_inet_ops);
1850 }
1851
1852 static int ipv4_proc_init(void);
1853
1854 /*
1855  *      IP protocol layer initialiser
1856  */
1857
1858 static struct packet_offload ip_packet_offload __read_mostly = {
1859         .type = cpu_to_be16(ETH_P_IP),
1860         .callbacks = {
1861                 .gso_segment = inet_gso_segment,
1862                 .gro_receive = inet_gro_receive,
1863                 .gro_complete = inet_gro_complete,
1864         },
1865 };
1866
1867 static const struct net_offload ipip_offload = {
1868         .callbacks = {
1869                 .gso_segment    = ipip_gso_segment,
1870                 .gro_receive    = ipip_gro_receive,
1871                 .gro_complete   = ipip_gro_complete,
1872         },
1873 };
1874
1875 static int __init ipip_offload_init(void)
1876 {
1877         return inet_add_offload(&ipip_offload, IPPROTO_IPIP);
1878 }
1879
1880 static int __init ipv4_offload_init(void)
1881 {
1882         /*
1883          * Add offloads
1884          */
1885         if (udpv4_offload_init() < 0)
1886                 pr_crit("%s: Cannot add UDP protocol offload\n", __func__);
1887         if (tcpv4_offload_init() < 0)
1888                 pr_crit("%s: Cannot add TCP protocol offload\n", __func__);
1889         if (ipip_offload_init() < 0)
1890                 pr_crit("%s: Cannot add IPIP protocol offload\n", __func__);
1891
1892         dev_add_offload(&ip_packet_offload);
1893         return 0;
1894 }
1895
1896 fs_initcall(ipv4_offload_init);
1897
1898 static struct packet_type ip_packet_type __read_mostly = {
1899         .type = cpu_to_be16(ETH_P_IP),
1900         .func = ip_rcv,
1901         .list_func = ip_list_rcv,
1902 };
1903
1904 static int __init inet_init(void)
1905 {
1906         struct inet_protosw *q;
1907         struct list_head *r;
1908         int rc = -EINVAL;
1909
1910         sock_skb_cb_check_size(sizeof(struct inet_skb_parm));
1911
1912         rc = proto_register(&tcp_prot, 1);
1913         if (rc)
1914                 goto out;
1915
1916         rc = proto_register(&udp_prot, 1);
1917         if (rc)
1918                 goto out_unregister_tcp_proto;
1919
1920         rc = proto_register(&raw_prot, 1);
1921         if (rc)
1922                 goto out_unregister_udp_proto;
1923
1924         rc = proto_register(&ping_prot, 1);
1925         if (rc)
1926                 goto out_unregister_raw_proto;
1927
1928         /*
1929          *      Tell SOCKET that we are alive...
1930          */
1931
1932         (void)sock_register(&inet_family_ops);
1933
1934 #ifdef CONFIG_SYSCTL
1935         ip_static_sysctl_init();
1936 #endif
1937
1938         /*
1939          *      Add all the base protocols.
1940          */
1941
1942         if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
1943                 pr_crit("%s: Cannot add ICMP protocol\n", __func__);
1944         if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0)
1945                 pr_crit("%s: Cannot add UDP protocol\n", __func__);
1946         if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0)
1947                 pr_crit("%s: Cannot add TCP protocol\n", __func__);
1948 #ifdef CONFIG_IP_MULTICAST
1949         if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
1950                 pr_crit("%s: Cannot add IGMP protocol\n", __func__);
1951 #endif
1952
1953         /* Register the socket-side information for inet_create. */
1954         for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
1955                 INIT_LIST_HEAD(r);
1956
1957         for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
1958                 inet_register_protosw(q);
1959
1960         /*
1961          *      Set the ARP module up
1962          */
1963
1964         arp_init();
1965
1966         /*
1967          *      Set the IP module up
1968          */
1969
1970         ip_init();
1971
1972         /* Initialise per-cpu ipv4 mibs */
1973         if (init_ipv4_mibs())
1974                 panic("%s: Cannot init ipv4 mibs\n", __func__);
1975
1976         /* Setup TCP slab cache for open requests. */
1977         tcp_init();
1978
1979         /* Setup UDP memory threshold */
1980         udp_init();
1981
1982         /* Add UDP-Lite (RFC 3828) */
1983         udplite4_register();
1984
1985         raw_init();
1986
1987         ping_init();
1988
1989         /*
1990          *      Set the ICMP layer up
1991          */
1992
1993         if (icmp_init() < 0)
1994                 panic("Failed to create the ICMP control socket.\n");
1995
1996         /*
1997          *      Initialise the multicast router
1998          */
1999 #if defined(CONFIG_IP_MROUTE)
2000         if (ip_mr_init())
2001                 pr_crit("%s: Cannot init ipv4 mroute\n", __func__);
2002 #endif
2003
2004         if (init_inet_pernet_ops())
2005                 pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__);
2006
2007         ipv4_proc_init();
2008
2009         ipfrag_init();
2010
2011         dev_add_pack(&ip_packet_type);
2012
2013         ip_tunnel_core_init();
2014
2015         rc = 0;
2016 out:
2017         return rc;
2018 out_unregister_raw_proto:
2019         proto_unregister(&raw_prot);
2020 out_unregister_udp_proto:
2021         proto_unregister(&udp_prot);
2022 out_unregister_tcp_proto:
2023         proto_unregister(&tcp_prot);
2024         goto out;
2025 }
2026
2027 fs_initcall(inet_init);
2028
2029 /* ------------------------------------------------------------------------ */
2030
2031 #ifdef CONFIG_PROC_FS
2032 static int __init ipv4_proc_init(void)
2033 {
2034         int rc = 0;
2035
2036         if (raw_proc_init())
2037                 goto out_raw;
2038         if (tcp4_proc_init())
2039                 goto out_tcp;
2040         if (udp4_proc_init())
2041                 goto out_udp;
2042         if (ping_proc_init())
2043                 goto out_ping;
2044         if (ip_misc_proc_init())
2045                 goto out_misc;
2046 out:
2047         return rc;
2048 out_misc:
2049         ping_proc_exit();
2050 out_ping:
2051         udp4_proc_exit();
2052 out_udp:
2053         tcp4_proc_exit();
2054 out_tcp:
2055         raw_proc_exit();
2056 out_raw:
2057         rc = -ENOMEM;
2058         goto out;
2059 }
2060
2061 #else /* CONFIG_PROC_FS */
2062 static int __init ipv4_proc_init(void)
2063 {
2064         return 0;
2065 }
2066 #endif /* CONFIG_PROC_FS */