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