af_inet.c revision db8dac20d5199307dcfcf4e01dac4bda5edf9e89
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 * Version: $Id: af_inet.c,v 1.137 2002/02/01 22:01:03 davem Exp $ 9 * 10 * Authors: Ross Biro 11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 12 * Florian La Roche, <flla@stud.uni-sb.de> 13 * Alan Cox, <A.Cox@swansea.ac.uk> 14 * 15 * Changes (see also sock.c) 16 * 17 * piggy, 18 * Karl Knutson : Socket protocol table 19 * A.N.Kuznetsov : Socket death error in accept(). 20 * John Richardson : Fix non blocking error in connect() 21 * so sockets that fail to connect 22 * don't return -EINPROGRESS. 23 * Alan Cox : Asynchronous I/O support 24 * Alan Cox : Keep correct socket pointer on sock 25 * structures 26 * when accept() ed 27 * Alan Cox : Semantics of SO_LINGER aren't state 28 * moved to close when you look carefully. 29 * With this fixed and the accept bug fixed 30 * some RPC stuff seems happier. 31 * Niibe Yutaka : 4.4BSD style write async I/O 32 * Alan Cox, 33 * Tony Gale : Fixed reuse semantics. 34 * Alan Cox : bind() shouldn't abort existing but dead 35 * sockets. Stops FTP netin:.. I hope. 36 * Alan Cox : bind() works correctly for RAW sockets. 37 * Note that FreeBSD at least was broken 38 * in this respect so be careful with 39 * compatibility tests... 40 * Alan Cox : routing cache support 41 * Alan Cox : memzero the socket structure for 42 * compactness. 43 * Matt Day : nonblock connect error handler 44 * Alan Cox : Allow large numbers of pending sockets 45 * (eg for big web sites), but only if 46 * specifically application requested. 47 * Alan Cox : New buffering throughout IP. Used 48 * dumbly. 49 * Alan Cox : New buffering now used smartly. 50 * Alan Cox : BSD rather than common sense 51 * interpretation of listen. 52 * Germano Caronni : Assorted small races. 53 * Alan Cox : sendmsg/recvmsg basic support. 54 * Alan Cox : Only sendmsg/recvmsg now supported. 55 * Alan Cox : Locked down bind (see security list). 56 * Alan Cox : Loosened bind a little. 57 * Mike McLagan : ADD/DEL DLCI Ioctls 58 * Willy Konynenberg : Transparent proxying support. 59 * David S. Miller : New socket lookup architecture. 60 * Some other random speedups. 61 * Cyrus Durgin : Cleaned up file for kmod hacks. 62 * Andi Kleen : Fix inet_stream_connect TCP race. 63 * 64 * This program is free software; you can redistribute it and/or 65 * modify it under the terms of the GNU General Public License 66 * as published by the Free Software Foundation; either version 67 * 2 of the License, or (at your option) any later version. 68 */ 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/module.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 92#include <asm/uaccess.h> 93#include <asm/system.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/ip.h> 100#include <net/protocol.h> 101#include <net/arp.h> 102#include <net/route.h> 103#include <net/ip_fib.h> 104#include <net/inet_connection_sock.h> 105#include <net/tcp.h> 106#include <net/udp.h> 107#include <net/udplite.h> 108#include <linux/skbuff.h> 109#include <net/sock.h> 110#include <net/raw.h> 111#include <net/icmp.h> 112#include <net/ipip.h> 113#include <net/inet_common.h> 114#include <net/xfrm.h> 115#ifdef CONFIG_IP_MROUTE 116#include <linux/mroute.h> 117#endif 118 119DEFINE_SNMP_STAT(struct linux_mib, net_statistics) __read_mostly; 120 121extern void ip_mc_drop_socket(struct sock *sk); 122 123/* The inetsw table contains everything that inet_create needs to 124 * build a new socket. 125 */ 126static struct list_head inetsw[SOCK_MAX]; 127static DEFINE_SPINLOCK(inetsw_lock); 128 129struct ipv4_config ipv4_config; 130 131EXPORT_SYMBOL(ipv4_config); 132 133/* New destruction routine */ 134 135void inet_sock_destruct(struct sock *sk) 136{ 137 struct inet_sock *inet = inet_sk(sk); 138 139 __skb_queue_purge(&sk->sk_receive_queue); 140 __skb_queue_purge(&sk->sk_error_queue); 141 142 sk_mem_reclaim(sk); 143 144 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) { 145 printk("Attempt to release TCP socket in state %d %p\n", 146 sk->sk_state, sk); 147 return; 148 } 149 if (!sock_flag(sk, SOCK_DEAD)) { 150 printk("Attempt to release alive inet socket %p\n", sk); 151 return; 152 } 153 154 BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc)); 155 BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc)); 156 BUG_TRAP(!sk->sk_wmem_queued); 157 BUG_TRAP(!sk->sk_forward_alloc); 158 159 kfree(inet->opt); 160 dst_release(sk->sk_dst_cache); 161 sk_refcnt_debug_dec(sk); 162} 163 164/* 165 * The routines beyond this point handle the behaviour of an AF_INET 166 * socket object. Mostly it punts to the subprotocols of IP to do 167 * the work. 168 */ 169 170/* 171 * Automatically bind an unbound socket. 172 */ 173 174static int inet_autobind(struct sock *sk) 175{ 176 struct inet_sock *inet; 177 /* We may need to bind the socket. */ 178 lock_sock(sk); 179 inet = inet_sk(sk); 180 if (!inet->num) { 181 if (sk->sk_prot->get_port(sk, 0)) { 182 release_sock(sk); 183 return -EAGAIN; 184 } 185 inet->sport = htons(inet->num); 186 } 187 release_sock(sk); 188 return 0; 189} 190 191/* 192 * Move a socket into listening state. 193 */ 194int inet_listen(struct socket *sock, int backlog) 195{ 196 struct sock *sk = sock->sk; 197 unsigned char old_state; 198 int err; 199 200 lock_sock(sk); 201 202 err = -EINVAL; 203 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM) 204 goto out; 205 206 old_state = sk->sk_state; 207 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN))) 208 goto out; 209 210 /* Really, if the socket is already in listen state 211 * we can only allow the backlog to be adjusted. 212 */ 213 if (old_state != TCP_LISTEN) { 214 err = inet_csk_listen_start(sk, backlog); 215 if (err) 216 goto out; 217 } 218 sk->sk_max_ack_backlog = backlog; 219 err = 0; 220 221out: 222 release_sock(sk); 223 return err; 224} 225 226u32 inet_ehash_secret __read_mostly; 227EXPORT_SYMBOL(inet_ehash_secret); 228 229/* 230 * inet_ehash_secret must be set exactly once 231 * Instead of using a dedicated spinlock, we (ab)use inetsw_lock 232 */ 233void build_ehash_secret(void) 234{ 235 u32 rnd; 236 do { 237 get_random_bytes(&rnd, sizeof(rnd)); 238 } while (rnd == 0); 239 spin_lock_bh(&inetsw_lock); 240 if (!inet_ehash_secret) 241 inet_ehash_secret = rnd; 242 spin_unlock_bh(&inetsw_lock); 243} 244EXPORT_SYMBOL(build_ehash_secret); 245 246/* 247 * Create an inet socket. 248 */ 249 250static int inet_create(struct net *net, struct socket *sock, int protocol) 251{ 252 struct sock *sk; 253 struct list_head *p; 254 struct inet_protosw *answer; 255 struct inet_sock *inet; 256 struct proto *answer_prot; 257 unsigned char answer_flags; 258 char answer_no_check; 259 int try_loading_module = 0; 260 int err; 261 262 if (net != &init_net) 263 return -EAFNOSUPPORT; 264 265 if (sock->type != SOCK_RAW && 266 sock->type != SOCK_DGRAM && 267 !inet_ehash_secret) 268 build_ehash_secret(); 269 270 sock->state = SS_UNCONNECTED; 271 272 /* Look for the requested type/protocol pair. */ 273 answer = NULL; 274lookup_protocol: 275 err = -ESOCKTNOSUPPORT; 276 rcu_read_lock(); 277 list_for_each_rcu(p, &inetsw[sock->type]) { 278 answer = list_entry(p, struct inet_protosw, list); 279 280 /* Check the non-wild match. */ 281 if (protocol == answer->protocol) { 282 if (protocol != IPPROTO_IP) 283 break; 284 } else { 285 /* Check for the two wild cases. */ 286 if (IPPROTO_IP == protocol) { 287 protocol = answer->protocol; 288 break; 289 } 290 if (IPPROTO_IP == answer->protocol) 291 break; 292 } 293 err = -EPROTONOSUPPORT; 294 answer = NULL; 295 } 296 297 if (unlikely(answer == NULL)) { 298 if (try_loading_module < 2) { 299 rcu_read_unlock(); 300 /* 301 * Be more specific, e.g. net-pf-2-proto-132-type-1 302 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) 303 */ 304 if (++try_loading_module == 1) 305 request_module("net-pf-%d-proto-%d-type-%d", 306 PF_INET, protocol, sock->type); 307 /* 308 * Fall back to generic, e.g. net-pf-2-proto-132 309 * (net-pf-PF_INET-proto-IPPROTO_SCTP) 310 */ 311 else 312 request_module("net-pf-%d-proto-%d", 313 PF_INET, protocol); 314 goto lookup_protocol; 315 } else 316 goto out_rcu_unlock; 317 } 318 319 err = -EPERM; 320 if (answer->capability > 0 && !capable(answer->capability)) 321 goto out_rcu_unlock; 322 323 sock->ops = answer->ops; 324 answer_prot = answer->prot; 325 answer_no_check = answer->no_check; 326 answer_flags = answer->flags; 327 rcu_read_unlock(); 328 329 BUG_TRAP(answer_prot->slab != NULL); 330 331 err = -ENOBUFS; 332 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot); 333 if (sk == NULL) 334 goto out; 335 336 err = 0; 337 sk->sk_no_check = answer_no_check; 338 if (INET_PROTOSW_REUSE & answer_flags) 339 sk->sk_reuse = 1; 340 341 inet = inet_sk(sk); 342 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 343 344 if (SOCK_RAW == sock->type) { 345 inet->num = protocol; 346 if (IPPROTO_RAW == protocol) 347 inet->hdrincl = 1; 348 } 349 350 if (ipv4_config.no_pmtu_disc) 351 inet->pmtudisc = IP_PMTUDISC_DONT; 352 else 353 inet->pmtudisc = IP_PMTUDISC_WANT; 354 355 inet->id = 0; 356 357 sock_init_data(sock, sk); 358 359 sk->sk_destruct = inet_sock_destruct; 360 sk->sk_family = PF_INET; 361 sk->sk_protocol = protocol; 362 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 363 364 inet->uc_ttl = -1; 365 inet->mc_loop = 1; 366 inet->mc_ttl = 1; 367 inet->mc_index = 0; 368 inet->mc_list = NULL; 369 370 sk_refcnt_debug_inc(sk); 371 372 if (inet->num) { 373 /* It assumes that any protocol which allows 374 * the user to assign a number at socket 375 * creation time automatically 376 * shares. 377 */ 378 inet->sport = htons(inet->num); 379 /* Add to protocol hash chains. */ 380 sk->sk_prot->hash(sk); 381 } 382 383 if (sk->sk_prot->init) { 384 err = sk->sk_prot->init(sk); 385 if (err) 386 sk_common_release(sk); 387 } 388out: 389 return err; 390out_rcu_unlock: 391 rcu_read_unlock(); 392 goto out; 393} 394 395 396/* 397 * The peer socket should always be NULL (or else). When we call this 398 * function we are destroying the object and from then on nobody 399 * should refer to it. 400 */ 401int inet_release(struct socket *sock) 402{ 403 struct sock *sk = sock->sk; 404 405 if (sk) { 406 long timeout; 407 408 /* Applications forget to leave groups before exiting */ 409 ip_mc_drop_socket(sk); 410 411 /* If linger is set, we don't return until the close 412 * is complete. Otherwise we return immediately. The 413 * actually closing is done the same either way. 414 * 415 * If the close is due to the process exiting, we never 416 * linger.. 417 */ 418 timeout = 0; 419 if (sock_flag(sk, SOCK_LINGER) && 420 !(current->flags & PF_EXITING)) 421 timeout = sk->sk_lingertime; 422 sock->sk = NULL; 423 sk->sk_prot->close(sk, timeout); 424 } 425 return 0; 426} 427 428/* It is off by default, see below. */ 429int sysctl_ip_nonlocal_bind __read_mostly; 430 431int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 432{ 433 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 434 struct sock *sk = sock->sk; 435 struct inet_sock *inet = inet_sk(sk); 436 unsigned short snum; 437 int chk_addr_ret; 438 int err; 439 440 /* If the socket has its own bind function then use it. (RAW) */ 441 if (sk->sk_prot->bind) { 442 err = sk->sk_prot->bind(sk, uaddr, addr_len); 443 goto out; 444 } 445 err = -EINVAL; 446 if (addr_len < sizeof(struct sockaddr_in)) 447 goto out; 448 449 chk_addr_ret = inet_addr_type(&init_net, addr->sin_addr.s_addr); 450 451 /* Not specified by any standard per-se, however it breaks too 452 * many applications when removed. It is unfortunate since 453 * allowing applications to make a non-local bind solves 454 * several problems with systems using dynamic addressing. 455 * (ie. your servers still start up even if your ISDN link 456 * is temporarily down) 457 */ 458 err = -EADDRNOTAVAIL; 459 if (!sysctl_ip_nonlocal_bind && 460 !inet->freebind && 461 addr->sin_addr.s_addr != INADDR_ANY && 462 chk_addr_ret != RTN_LOCAL && 463 chk_addr_ret != RTN_MULTICAST && 464 chk_addr_ret != RTN_BROADCAST) 465 goto out; 466 467 snum = ntohs(addr->sin_port); 468 err = -EACCES; 469 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) 470 goto out; 471 472 /* We keep a pair of addresses. rcv_saddr is the one 473 * used by hash lookups, and saddr is used for transmit. 474 * 475 * In the BSD API these are the same except where it 476 * would be illegal to use them (multicast/broadcast) in 477 * which case the sending device address is used. 478 */ 479 lock_sock(sk); 480 481 /* Check these errors (active socket, double bind). */ 482 err = -EINVAL; 483 if (sk->sk_state != TCP_CLOSE || inet->num) 484 goto out_release_sock; 485 486 inet->rcv_saddr = inet->saddr = addr->sin_addr.s_addr; 487 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 488 inet->saddr = 0; /* Use device */ 489 490 /* Make sure we are allowed to bind here. */ 491 if (sk->sk_prot->get_port(sk, snum)) { 492 inet->saddr = inet->rcv_saddr = 0; 493 err = -EADDRINUSE; 494 goto out_release_sock; 495 } 496 497 if (inet->rcv_saddr) 498 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 499 if (snum) 500 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 501 inet->sport = htons(inet->num); 502 inet->daddr = 0; 503 inet->dport = 0; 504 sk_dst_reset(sk); 505 err = 0; 506out_release_sock: 507 release_sock(sk); 508out: 509 return err; 510} 511 512int inet_dgram_connect(struct socket *sock, struct sockaddr * uaddr, 513 int addr_len, int flags) 514{ 515 struct sock *sk = sock->sk; 516 517 if (uaddr->sa_family == AF_UNSPEC) 518 return sk->sk_prot->disconnect(sk, flags); 519 520 if (!inet_sk(sk)->num && inet_autobind(sk)) 521 return -EAGAIN; 522 return sk->sk_prot->connect(sk, (struct sockaddr *)uaddr, addr_len); 523} 524 525static long inet_wait_for_connect(struct sock *sk, long timeo) 526{ 527 DEFINE_WAIT(wait); 528 529 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 530 531 /* Basic assumption: if someone sets sk->sk_err, he _must_ 532 * change state of the socket from TCP_SYN_*. 533 * Connect() does not allow to get error notifications 534 * without closing the socket. 535 */ 536 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 537 release_sock(sk); 538 timeo = schedule_timeout(timeo); 539 lock_sock(sk); 540 if (signal_pending(current) || !timeo) 541 break; 542 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 543 } 544 finish_wait(sk->sk_sleep, &wait); 545 return timeo; 546} 547 548/* 549 * Connect to a remote host. There is regrettably still a little 550 * TCP 'magic' in here. 551 */ 552int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 553 int addr_len, int flags) 554{ 555 struct sock *sk = sock->sk; 556 int err; 557 long timeo; 558 559 lock_sock(sk); 560 561 if (uaddr->sa_family == AF_UNSPEC) { 562 err = sk->sk_prot->disconnect(sk, flags); 563 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 564 goto out; 565 } 566 567 switch (sock->state) { 568 default: 569 err = -EINVAL; 570 goto out; 571 case SS_CONNECTED: 572 err = -EISCONN; 573 goto out; 574 case SS_CONNECTING: 575 err = -EALREADY; 576 /* Fall out of switch with err, set for this state */ 577 break; 578 case SS_UNCONNECTED: 579 err = -EISCONN; 580 if (sk->sk_state != TCP_CLOSE) 581 goto out; 582 583 err = sk->sk_prot->connect(sk, uaddr, addr_len); 584 if (err < 0) 585 goto out; 586 587 sock->state = SS_CONNECTING; 588 589 /* Just entered SS_CONNECTING state; the only 590 * difference is that return value in non-blocking 591 * case is EINPROGRESS, rather than EALREADY. 592 */ 593 err = -EINPROGRESS; 594 break; 595 } 596 597 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 598 599 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 600 /* Error code is set above */ 601 if (!timeo || !inet_wait_for_connect(sk, timeo)) 602 goto out; 603 604 err = sock_intr_errno(timeo); 605 if (signal_pending(current)) 606 goto out; 607 } 608 609 /* Connection was closed by RST, timeout, ICMP error 610 * or another process disconnected us. 611 */ 612 if (sk->sk_state == TCP_CLOSE) 613 goto sock_error; 614 615 /* sk->sk_err may be not zero now, if RECVERR was ordered by user 616 * and error was received after socket entered established state. 617 * Hence, it is handled normally after connect() return successfully. 618 */ 619 620 sock->state = SS_CONNECTED; 621 err = 0; 622out: 623 release_sock(sk); 624 return err; 625 626sock_error: 627 err = sock_error(sk) ? : -ECONNABORTED; 628 sock->state = SS_UNCONNECTED; 629 if (sk->sk_prot->disconnect(sk, flags)) 630 sock->state = SS_DISCONNECTING; 631 goto out; 632} 633 634/* 635 * Accept a pending connection. The TCP layer now gives BSD semantics. 636 */ 637 638int inet_accept(struct socket *sock, struct socket *newsock, int flags) 639{ 640 struct sock *sk1 = sock->sk; 641 int err = -EINVAL; 642 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err); 643 644 if (!sk2) 645 goto do_err; 646 647 lock_sock(sk2); 648 649 BUG_TRAP((1 << sk2->sk_state) & 650 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE)); 651 652 sock_graft(sk2, newsock); 653 654 newsock->state = SS_CONNECTED; 655 err = 0; 656 release_sock(sk2); 657do_err: 658 return err; 659} 660 661 662/* 663 * This does both peername and sockname. 664 */ 665int inet_getname(struct socket *sock, struct sockaddr *uaddr, 666 int *uaddr_len, int peer) 667{ 668 struct sock *sk = sock->sk; 669 struct inet_sock *inet = inet_sk(sk); 670 struct sockaddr_in *sin = (struct sockaddr_in *)uaddr; 671 672 sin->sin_family = AF_INET; 673 if (peer) { 674 if (!inet->dport || 675 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 676 peer == 1)) 677 return -ENOTCONN; 678 sin->sin_port = inet->dport; 679 sin->sin_addr.s_addr = inet->daddr; 680 } else { 681 __be32 addr = inet->rcv_saddr; 682 if (!addr) 683 addr = inet->saddr; 684 sin->sin_port = inet->sport; 685 sin->sin_addr.s_addr = addr; 686 } 687 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 688 *uaddr_len = sizeof(*sin); 689 return 0; 690} 691 692int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 693 size_t size) 694{ 695 struct sock *sk = sock->sk; 696 697 /* We may need to bind the socket. */ 698 if (!inet_sk(sk)->num && inet_autobind(sk)) 699 return -EAGAIN; 700 701 return sk->sk_prot->sendmsg(iocb, sk, msg, size); 702} 703 704 705static ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) 706{ 707 struct sock *sk = sock->sk; 708 709 /* We may need to bind the socket. */ 710 if (!inet_sk(sk)->num && inet_autobind(sk)) 711 return -EAGAIN; 712 713 if (sk->sk_prot->sendpage) 714 return sk->sk_prot->sendpage(sk, page, offset, size, flags); 715 return sock_no_sendpage(sock, page, offset, size, flags); 716} 717 718 719int inet_shutdown(struct socket *sock, int how) 720{ 721 struct sock *sk = sock->sk; 722 int err = 0; 723 724 /* This should really check to make sure 725 * the socket is a TCP socket. (WHY AC...) 726 */ 727 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and 728 1->2 bit 2 snds. 729 2->3 */ 730 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ 731 return -EINVAL; 732 733 lock_sock(sk); 734 if (sock->state == SS_CONNECTING) { 735 if ((1 << sk->sk_state) & 736 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) 737 sock->state = SS_DISCONNECTING; 738 else 739 sock->state = SS_CONNECTED; 740 } 741 742 switch (sk->sk_state) { 743 case TCP_CLOSE: 744 err = -ENOTCONN; 745 /* Hack to wake up other listeners, who can poll for 746 POLLHUP, even on eg. unconnected UDP sockets -- RR */ 747 default: 748 sk->sk_shutdown |= how; 749 if (sk->sk_prot->shutdown) 750 sk->sk_prot->shutdown(sk, how); 751 break; 752 753 /* Remaining two branches are temporary solution for missing 754 * close() in multithreaded environment. It is _not_ a good idea, 755 * but we have no choice until close() is repaired at VFS level. 756 */ 757 case TCP_LISTEN: 758 if (!(how & RCV_SHUTDOWN)) 759 break; 760 /* Fall through */ 761 case TCP_SYN_SENT: 762 err = sk->sk_prot->disconnect(sk, O_NONBLOCK); 763 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 764 break; 765 } 766 767 /* Wake up anyone sleeping in poll. */ 768 sk->sk_state_change(sk); 769 release_sock(sk); 770 return err; 771} 772 773/* 774 * ioctl() calls you can issue on an INET socket. Most of these are 775 * device configuration and stuff and very rarely used. Some ioctls 776 * pass on to the socket itself. 777 * 778 * NOTE: I like the idea of a module for the config stuff. ie ifconfig 779 * loads the devconfigure module does its configuring and unloads it. 780 * There's a good 20K of config code hanging around the kernel. 781 */ 782 783int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 784{ 785 struct sock *sk = sock->sk; 786 int err = 0; 787 struct net *net = sk->sk_net; 788 789 switch (cmd) { 790 case SIOCGSTAMP: 791 err = sock_get_timestamp(sk, (struct timeval __user *)arg); 792 break; 793 case SIOCGSTAMPNS: 794 err = sock_get_timestampns(sk, (struct timespec __user *)arg); 795 break; 796 case SIOCADDRT: 797 case SIOCDELRT: 798 case SIOCRTMSG: 799 err = ip_rt_ioctl(net, cmd, (void __user *)arg); 800 break; 801 case SIOCDARP: 802 case SIOCGARP: 803 case SIOCSARP: 804 err = arp_ioctl(net, cmd, (void __user *)arg); 805 break; 806 case SIOCGIFADDR: 807 case SIOCSIFADDR: 808 case SIOCGIFBRDADDR: 809 case SIOCSIFBRDADDR: 810 case SIOCGIFNETMASK: 811 case SIOCSIFNETMASK: 812 case SIOCGIFDSTADDR: 813 case SIOCSIFDSTADDR: 814 case SIOCSIFPFLAGS: 815 case SIOCGIFPFLAGS: 816 case SIOCSIFFLAGS: 817 err = devinet_ioctl(net, cmd, (void __user *)arg); 818 break; 819 default: 820 if (sk->sk_prot->ioctl) 821 err = sk->sk_prot->ioctl(sk, cmd, arg); 822 else 823 err = -ENOIOCTLCMD; 824 break; 825 } 826 return err; 827} 828 829const struct proto_ops inet_stream_ops = { 830 .family = PF_INET, 831 .owner = THIS_MODULE, 832 .release = inet_release, 833 .bind = inet_bind, 834 .connect = inet_stream_connect, 835 .socketpair = sock_no_socketpair, 836 .accept = inet_accept, 837 .getname = inet_getname, 838 .poll = tcp_poll, 839 .ioctl = inet_ioctl, 840 .listen = inet_listen, 841 .shutdown = inet_shutdown, 842 .setsockopt = sock_common_setsockopt, 843 .getsockopt = sock_common_getsockopt, 844 .sendmsg = tcp_sendmsg, 845 .recvmsg = sock_common_recvmsg, 846 .mmap = sock_no_mmap, 847 .sendpage = tcp_sendpage, 848 .splice_read = tcp_splice_read, 849#ifdef CONFIG_COMPAT 850 .compat_setsockopt = compat_sock_common_setsockopt, 851 .compat_getsockopt = compat_sock_common_getsockopt, 852#endif 853}; 854 855const struct proto_ops inet_dgram_ops = { 856 .family = PF_INET, 857 .owner = THIS_MODULE, 858 .release = inet_release, 859 .bind = inet_bind, 860 .connect = inet_dgram_connect, 861 .socketpair = sock_no_socketpair, 862 .accept = sock_no_accept, 863 .getname = inet_getname, 864 .poll = udp_poll, 865 .ioctl = inet_ioctl, 866 .listen = sock_no_listen, 867 .shutdown = inet_shutdown, 868 .setsockopt = sock_common_setsockopt, 869 .getsockopt = sock_common_getsockopt, 870 .sendmsg = inet_sendmsg, 871 .recvmsg = sock_common_recvmsg, 872 .mmap = sock_no_mmap, 873 .sendpage = inet_sendpage, 874#ifdef CONFIG_COMPAT 875 .compat_setsockopt = compat_sock_common_setsockopt, 876 .compat_getsockopt = compat_sock_common_getsockopt, 877#endif 878}; 879 880/* 881 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 882 * udp_poll 883 */ 884static const struct proto_ops inet_sockraw_ops = { 885 .family = PF_INET, 886 .owner = THIS_MODULE, 887 .release = inet_release, 888 .bind = inet_bind, 889 .connect = inet_dgram_connect, 890 .socketpair = sock_no_socketpair, 891 .accept = sock_no_accept, 892 .getname = inet_getname, 893 .poll = datagram_poll, 894 .ioctl = inet_ioctl, 895 .listen = sock_no_listen, 896 .shutdown = inet_shutdown, 897 .setsockopt = sock_common_setsockopt, 898 .getsockopt = sock_common_getsockopt, 899 .sendmsg = inet_sendmsg, 900 .recvmsg = sock_common_recvmsg, 901 .mmap = sock_no_mmap, 902 .sendpage = inet_sendpage, 903#ifdef CONFIG_COMPAT 904 .compat_setsockopt = compat_sock_common_setsockopt, 905 .compat_getsockopt = compat_sock_common_getsockopt, 906#endif 907}; 908 909static struct net_proto_family inet_family_ops = { 910 .family = PF_INET, 911 .create = inet_create, 912 .owner = THIS_MODULE, 913}; 914 915/* Upon startup we insert all the elements in inetsw_array[] into 916 * the linked list inetsw. 917 */ 918static struct inet_protosw inetsw_array[] = 919{ 920 { 921 .type = SOCK_STREAM, 922 .protocol = IPPROTO_TCP, 923 .prot = &tcp_prot, 924 .ops = &inet_stream_ops, 925 .capability = -1, 926 .no_check = 0, 927 .flags = INET_PROTOSW_PERMANENT | 928 INET_PROTOSW_ICSK, 929 }, 930 931 { 932 .type = SOCK_DGRAM, 933 .protocol = IPPROTO_UDP, 934 .prot = &udp_prot, 935 .ops = &inet_dgram_ops, 936 .capability = -1, 937 .no_check = UDP_CSUM_DEFAULT, 938 .flags = INET_PROTOSW_PERMANENT, 939 }, 940 941 942 { 943 .type = SOCK_RAW, 944 .protocol = IPPROTO_IP, /* wild card */ 945 .prot = &raw_prot, 946 .ops = &inet_sockraw_ops, 947 .capability = CAP_NET_RAW, 948 .no_check = UDP_CSUM_DEFAULT, 949 .flags = INET_PROTOSW_REUSE, 950 } 951}; 952 953#define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) 954 955void inet_register_protosw(struct inet_protosw *p) 956{ 957 struct list_head *lh; 958 struct inet_protosw *answer; 959 int protocol = p->protocol; 960 struct list_head *last_perm; 961 962 spin_lock_bh(&inetsw_lock); 963 964 if (p->type >= SOCK_MAX) 965 goto out_illegal; 966 967 /* If we are trying to override a permanent protocol, bail. */ 968 answer = NULL; 969 last_perm = &inetsw[p->type]; 970 list_for_each(lh, &inetsw[p->type]) { 971 answer = list_entry(lh, struct inet_protosw, list); 972 973 /* Check only the non-wild match. */ 974 if (INET_PROTOSW_PERMANENT & answer->flags) { 975 if (protocol == answer->protocol) 976 break; 977 last_perm = lh; 978 } 979 980 answer = NULL; 981 } 982 if (answer) 983 goto out_permanent; 984 985 /* Add the new entry after the last permanent entry if any, so that 986 * the new entry does not override a permanent entry when matched with 987 * a wild-card protocol. But it is allowed to override any existing 988 * non-permanent entry. This means that when we remove this entry, the 989 * system automatically returns to the old behavior. 990 */ 991 list_add_rcu(&p->list, last_perm); 992out: 993 spin_unlock_bh(&inetsw_lock); 994 995 synchronize_net(); 996 997 return; 998 999out_permanent: 1000 printk(KERN_ERR "Attempt to override permanent protocol %d.\n", 1001 protocol); 1002 goto out; 1003 1004out_illegal: 1005 printk(KERN_ERR 1006 "Ignoring attempt to register invalid socket type %d.\n", 1007 p->type); 1008 goto out; 1009} 1010 1011void inet_unregister_protosw(struct inet_protosw *p) 1012{ 1013 if (INET_PROTOSW_PERMANENT & p->flags) { 1014 printk(KERN_ERR 1015 "Attempt to unregister permanent protocol %d.\n", 1016 p->protocol); 1017 } else { 1018 spin_lock_bh(&inetsw_lock); 1019 list_del_rcu(&p->list); 1020 spin_unlock_bh(&inetsw_lock); 1021 1022 synchronize_net(); 1023 } 1024} 1025 1026/* 1027 * Shall we try to damage output packets if routing dev changes? 1028 */ 1029 1030int sysctl_ip_dynaddr __read_mostly; 1031 1032static int inet_sk_reselect_saddr(struct sock *sk) 1033{ 1034 struct inet_sock *inet = inet_sk(sk); 1035 int err; 1036 struct rtable *rt; 1037 __be32 old_saddr = inet->saddr; 1038 __be32 new_saddr; 1039 __be32 daddr = inet->daddr; 1040 1041 if (inet->opt && inet->opt->srr) 1042 daddr = inet->opt->faddr; 1043 1044 /* Query new route. */ 1045 err = ip_route_connect(&rt, daddr, 0, 1046 RT_CONN_FLAGS(sk), 1047 sk->sk_bound_dev_if, 1048 sk->sk_protocol, 1049 inet->sport, inet->dport, sk, 0); 1050 if (err) 1051 return err; 1052 1053 sk_setup_caps(sk, &rt->u.dst); 1054 1055 new_saddr = rt->rt_src; 1056 1057 if (new_saddr == old_saddr) 1058 return 0; 1059 1060 if (sysctl_ip_dynaddr > 1) { 1061 printk(KERN_INFO "%s(): shifting inet->" 1062 "saddr from %d.%d.%d.%d to %d.%d.%d.%d\n", 1063 __func__, 1064 NIPQUAD(old_saddr), 1065 NIPQUAD(new_saddr)); 1066 } 1067 1068 inet->saddr = inet->rcv_saddr = new_saddr; 1069 1070 /* 1071 * XXX The only one ugly spot where we need to 1072 * XXX really change the sockets identity after 1073 * XXX it has entered the hashes. -DaveM 1074 * 1075 * Besides that, it does not check for connection 1076 * uniqueness. Wait for troubles. 1077 */ 1078 __sk_prot_rehash(sk); 1079 return 0; 1080} 1081 1082int inet_sk_rebuild_header(struct sock *sk) 1083{ 1084 struct inet_sock *inet = inet_sk(sk); 1085 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); 1086 __be32 daddr; 1087 int err; 1088 1089 /* Route is OK, nothing to do. */ 1090 if (rt) 1091 return 0; 1092 1093 /* Reroute. */ 1094 daddr = inet->daddr; 1095 if (inet->opt && inet->opt->srr) 1096 daddr = inet->opt->faddr; 1097{ 1098 struct flowi fl = { 1099 .oif = sk->sk_bound_dev_if, 1100 .nl_u = { 1101 .ip4_u = { 1102 .daddr = daddr, 1103 .saddr = inet->saddr, 1104 .tos = RT_CONN_FLAGS(sk), 1105 }, 1106 }, 1107 .proto = sk->sk_protocol, 1108 .uli_u = { 1109 .ports = { 1110 .sport = inet->sport, 1111 .dport = inet->dport, 1112 }, 1113 }, 1114 }; 1115 1116 security_sk_classify_flow(sk, &fl); 1117 err = ip_route_output_flow(&init_net, &rt, &fl, sk, 0); 1118} 1119 if (!err) 1120 sk_setup_caps(sk, &rt->u.dst); 1121 else { 1122 /* Routing failed... */ 1123 sk->sk_route_caps = 0; 1124 /* 1125 * Other protocols have to map its equivalent state to TCP_SYN_SENT. 1126 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme 1127 */ 1128 if (!sysctl_ip_dynaddr || 1129 sk->sk_state != TCP_SYN_SENT || 1130 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 1131 (err = inet_sk_reselect_saddr(sk)) != 0) 1132 sk->sk_err_soft = -err; 1133 } 1134 1135 return err; 1136} 1137 1138EXPORT_SYMBOL(inet_sk_rebuild_header); 1139 1140static int inet_gso_send_check(struct sk_buff *skb) 1141{ 1142 struct iphdr *iph; 1143 struct net_protocol *ops; 1144 int proto; 1145 int ihl; 1146 int err = -EINVAL; 1147 1148 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1149 goto out; 1150 1151 iph = ip_hdr(skb); 1152 ihl = iph->ihl * 4; 1153 if (ihl < sizeof(*iph)) 1154 goto out; 1155 1156 if (unlikely(!pskb_may_pull(skb, ihl))) 1157 goto out; 1158 1159 __skb_pull(skb, ihl); 1160 skb_reset_transport_header(skb); 1161 iph = ip_hdr(skb); 1162 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1163 err = -EPROTONOSUPPORT; 1164 1165 rcu_read_lock(); 1166 ops = rcu_dereference(inet_protos[proto]); 1167 if (likely(ops && ops->gso_send_check)) 1168 err = ops->gso_send_check(skb); 1169 rcu_read_unlock(); 1170 1171out: 1172 return err; 1173} 1174 1175static struct sk_buff *inet_gso_segment(struct sk_buff *skb, int features) 1176{ 1177 struct sk_buff *segs = ERR_PTR(-EINVAL); 1178 struct iphdr *iph; 1179 struct net_protocol *ops; 1180 int proto; 1181 int ihl; 1182 int id; 1183 1184 if (!(features & NETIF_F_V4_CSUM)) 1185 features &= ~NETIF_F_SG; 1186 1187 if (unlikely(skb_shinfo(skb)->gso_type & 1188 ~(SKB_GSO_TCPV4 | 1189 SKB_GSO_UDP | 1190 SKB_GSO_DODGY | 1191 SKB_GSO_TCP_ECN | 1192 0))) 1193 goto out; 1194 1195 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1196 goto out; 1197 1198 iph = ip_hdr(skb); 1199 ihl = iph->ihl * 4; 1200 if (ihl < sizeof(*iph)) 1201 goto out; 1202 1203 if (unlikely(!pskb_may_pull(skb, ihl))) 1204 goto out; 1205 1206 __skb_pull(skb, ihl); 1207 skb_reset_transport_header(skb); 1208 iph = ip_hdr(skb); 1209 id = ntohs(iph->id); 1210 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1211 segs = ERR_PTR(-EPROTONOSUPPORT); 1212 1213 rcu_read_lock(); 1214 ops = rcu_dereference(inet_protos[proto]); 1215 if (likely(ops && ops->gso_segment)) 1216 segs = ops->gso_segment(skb, features); 1217 rcu_read_unlock(); 1218 1219 if (!segs || unlikely(IS_ERR(segs))) 1220 goto out; 1221 1222 skb = segs; 1223 do { 1224 iph = ip_hdr(skb); 1225 iph->id = htons(id++); 1226 iph->tot_len = htons(skb->len - skb->mac_len); 1227 iph->check = 0; 1228 iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl); 1229 } while ((skb = skb->next)); 1230 1231out: 1232 return segs; 1233} 1234 1235unsigned long snmp_fold_field(void *mib[], int offt) 1236{ 1237 unsigned long res = 0; 1238 int i; 1239 1240 for_each_possible_cpu(i) { 1241 res += *(((unsigned long *) per_cpu_ptr(mib[0], i)) + offt); 1242 res += *(((unsigned long *) per_cpu_ptr(mib[1], i)) + offt); 1243 } 1244 return res; 1245} 1246EXPORT_SYMBOL_GPL(snmp_fold_field); 1247 1248int snmp_mib_init(void *ptr[2], size_t mibsize) 1249{ 1250 BUG_ON(ptr == NULL); 1251 ptr[0] = __alloc_percpu(mibsize); 1252 if (!ptr[0]) 1253 goto err0; 1254 ptr[1] = __alloc_percpu(mibsize); 1255 if (!ptr[1]) 1256 goto err1; 1257 return 0; 1258err1: 1259 free_percpu(ptr[0]); 1260 ptr[0] = NULL; 1261err0: 1262 return -ENOMEM; 1263} 1264EXPORT_SYMBOL_GPL(snmp_mib_init); 1265 1266void snmp_mib_free(void *ptr[2]) 1267{ 1268 BUG_ON(ptr == NULL); 1269 free_percpu(ptr[0]); 1270 free_percpu(ptr[1]); 1271 ptr[0] = ptr[1] = NULL; 1272} 1273EXPORT_SYMBOL_GPL(snmp_mib_free); 1274 1275#ifdef CONFIG_IP_MULTICAST 1276static struct net_protocol igmp_protocol = { 1277 .handler = igmp_rcv, 1278}; 1279#endif 1280 1281static struct net_protocol tcp_protocol = { 1282 .handler = tcp_v4_rcv, 1283 .err_handler = tcp_v4_err, 1284 .gso_send_check = tcp_v4_gso_send_check, 1285 .gso_segment = tcp_tso_segment, 1286 .no_policy = 1, 1287}; 1288 1289static struct net_protocol udp_protocol = { 1290 .handler = udp_rcv, 1291 .err_handler = udp_err, 1292 .no_policy = 1, 1293}; 1294 1295static struct net_protocol icmp_protocol = { 1296 .handler = icmp_rcv, 1297 .no_policy = 1, 1298}; 1299 1300static int __init init_ipv4_mibs(void) 1301{ 1302 if (snmp_mib_init((void **)net_statistics, 1303 sizeof(struct linux_mib)) < 0) 1304 goto err_net_mib; 1305 if (snmp_mib_init((void **)ip_statistics, 1306 sizeof(struct ipstats_mib)) < 0) 1307 goto err_ip_mib; 1308 if (snmp_mib_init((void **)icmp_statistics, 1309 sizeof(struct icmp_mib)) < 0) 1310 goto err_icmp_mib; 1311 if (snmp_mib_init((void **)icmpmsg_statistics, 1312 sizeof(struct icmpmsg_mib)) < 0) 1313 goto err_icmpmsg_mib; 1314 if (snmp_mib_init((void **)tcp_statistics, 1315 sizeof(struct tcp_mib)) < 0) 1316 goto err_tcp_mib; 1317 if (snmp_mib_init((void **)udp_statistics, 1318 sizeof(struct udp_mib)) < 0) 1319 goto err_udp_mib; 1320 if (snmp_mib_init((void **)udplite_statistics, 1321 sizeof(struct udp_mib)) < 0) 1322 goto err_udplite_mib; 1323 1324 tcp_mib_init(); 1325 1326 return 0; 1327 1328err_udplite_mib: 1329 snmp_mib_free((void **)udp_statistics); 1330err_udp_mib: 1331 snmp_mib_free((void **)tcp_statistics); 1332err_tcp_mib: 1333 snmp_mib_free((void **)icmpmsg_statistics); 1334err_icmpmsg_mib: 1335 snmp_mib_free((void **)icmp_statistics); 1336err_icmp_mib: 1337 snmp_mib_free((void **)ip_statistics); 1338err_ip_mib: 1339 snmp_mib_free((void **)net_statistics); 1340err_net_mib: 1341 return -ENOMEM; 1342} 1343 1344static int ipv4_proc_init(void); 1345 1346/* 1347 * IP protocol layer initialiser 1348 */ 1349 1350static struct packet_type ip_packet_type = { 1351 .type = __constant_htons(ETH_P_IP), 1352 .func = ip_rcv, 1353 .gso_send_check = inet_gso_send_check, 1354 .gso_segment = inet_gso_segment, 1355}; 1356 1357static int __init inet_init(void) 1358{ 1359 struct sk_buff *dummy_skb; 1360 struct inet_protosw *q; 1361 struct list_head *r; 1362 int rc = -EINVAL; 1363 1364 BUILD_BUG_ON(sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb)); 1365 1366 rc = proto_register(&tcp_prot, 1); 1367 if (rc) 1368 goto out; 1369 1370 rc = proto_register(&udp_prot, 1); 1371 if (rc) 1372 goto out_unregister_tcp_proto; 1373 1374 rc = proto_register(&raw_prot, 1); 1375 if (rc) 1376 goto out_unregister_udp_proto; 1377 1378 /* 1379 * Tell SOCKET that we are alive... 1380 */ 1381 1382 (void)sock_register(&inet_family_ops); 1383 1384 /* 1385 * Add all the base protocols. 1386 */ 1387 1388 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 1389 printk(KERN_CRIT "inet_init: Cannot add ICMP protocol\n"); 1390 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) 1391 printk(KERN_CRIT "inet_init: Cannot add UDP protocol\n"); 1392 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) 1393 printk(KERN_CRIT "inet_init: Cannot add TCP protocol\n"); 1394#ifdef CONFIG_IP_MULTICAST 1395 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 1396 printk(KERN_CRIT "inet_init: Cannot add IGMP protocol\n"); 1397#endif 1398 1399 /* Register the socket-side information for inet_create. */ 1400 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 1401 INIT_LIST_HEAD(r); 1402 1403 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 1404 inet_register_protosw(q); 1405 1406 /* 1407 * Set the ARP module up 1408 */ 1409 1410 arp_init(); 1411 1412 /* 1413 * Set the IP module up 1414 */ 1415 1416 ip_init(); 1417 1418 tcp_v4_init(); 1419 1420 /* Setup TCP slab cache for open requests. */ 1421 tcp_init(); 1422 1423 /* Setup UDP memory threshold */ 1424 udp_init(); 1425 1426 /* Add UDP-Lite (RFC 3828) */ 1427 udplite4_register(); 1428 1429 /* 1430 * Set the ICMP layer up 1431 */ 1432 1433 if (icmp_init() < 0) 1434 panic("Failed to create the ICMP control socket.\n"); 1435 1436 /* 1437 * Initialise the multicast router 1438 */ 1439#if defined(CONFIG_IP_MROUTE) 1440 ip_mr_init(); 1441#endif 1442 /* 1443 * Initialise per-cpu ipv4 mibs 1444 */ 1445 1446 if (init_ipv4_mibs()) 1447 printk(KERN_CRIT "inet_init: Cannot init ipv4 mibs\n"); ; 1448 1449 ipv4_proc_init(); 1450 1451 ipfrag_init(); 1452 1453 dev_add_pack(&ip_packet_type); 1454 1455 rc = 0; 1456out: 1457 return rc; 1458out_unregister_udp_proto: 1459 proto_unregister(&udp_prot); 1460out_unregister_tcp_proto: 1461 proto_unregister(&tcp_prot); 1462 goto out; 1463} 1464 1465fs_initcall(inet_init); 1466 1467/* ------------------------------------------------------------------------ */ 1468 1469#ifdef CONFIG_PROC_FS 1470static int __init ipv4_proc_init(void) 1471{ 1472 int rc = 0; 1473 1474 if (raw_proc_init()) 1475 goto out_raw; 1476 if (tcp4_proc_init()) 1477 goto out_tcp; 1478 if (udp4_proc_init()) 1479 goto out_udp; 1480 if (ip_misc_proc_init()) 1481 goto out_misc; 1482out: 1483 return rc; 1484out_misc: 1485 udp4_proc_exit(); 1486out_udp: 1487 tcp4_proc_exit(); 1488out_tcp: 1489 raw_proc_exit(); 1490out_raw: 1491 rc = -ENOMEM; 1492 goto out; 1493} 1494 1495#else /* CONFIG_PROC_FS */ 1496static int __init ipv4_proc_init(void) 1497{ 1498 return 0; 1499} 1500#endif /* CONFIG_PROC_FS */ 1501 1502MODULE_ALIAS_NETPROTO(PF_INET); 1503 1504EXPORT_SYMBOL(inet_accept); 1505EXPORT_SYMBOL(inet_bind); 1506EXPORT_SYMBOL(inet_dgram_connect); 1507EXPORT_SYMBOL(inet_dgram_ops); 1508EXPORT_SYMBOL(inet_getname); 1509EXPORT_SYMBOL(inet_ioctl); 1510EXPORT_SYMBOL(inet_listen); 1511EXPORT_SYMBOL(inet_register_protosw); 1512EXPORT_SYMBOL(inet_release); 1513EXPORT_SYMBOL(inet_sendmsg); 1514EXPORT_SYMBOL(inet_shutdown); 1515EXPORT_SYMBOL(inet_sock_destruct); 1516EXPORT_SYMBOL(inet_stream_connect); 1517EXPORT_SYMBOL(inet_stream_ops); 1518EXPORT_SYMBOL(inet_unregister_protosw); 1519EXPORT_SYMBOL(net_statistics); 1520EXPORT_SYMBOL(sysctl_ip_nonlocal_bind); 1521