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/smp_lock.h> 96 #include <linux/inet.h> 97 #include <linux/igmp.h> 98 #include <linux/inetdevice.h> 99 #include <linux/netdevice.h> 100 #include <net/ip.h> 101 #include <net/protocol.h> 102 #include <net/arp.h> 103 #include <net/route.h> 104 #include <net/ip_fib.h> 105 #include <net/inet_connection_sock.h> 106 #include <net/tcp.h> 107 #include <net/udp.h> 108 #include <net/udplite.h> 109 #include <linux/skbuff.h> 110 #include <net/sock.h> 111 #include <net/raw.h> 112 #include <net/icmp.h> 113 #include <net/ipip.h> 114 #include <net/inet_common.h> 115 #include <net/xfrm.h> 116 #ifdef CONFIG_IP_MROUTE 117 #include <linux/mroute.h> 118 #endif 119 120 DEFINE_SNMP_STAT(struct linux_mib, net_statistics) __read_mostly; 121 122 extern void ip_mc_drop_socket(struct sock *sk); 123 124 /* The inetsw table contains everything that inet_create needs to 125 * build a new socket. 126 */ 127 static struct list_head inetsw[SOCK_MAX]; 128 static DEFINE_SPINLOCK(inetsw_lock); 129 130 /* New destruction routine */ 131 132 void inet_sock_destruct(struct sock *sk) 133 { 134 struct inet_sock *inet = inet_sk(sk); 135 136 __skb_queue_purge(&sk->sk_receive_queue); 137 __skb_queue_purge(&sk->sk_error_queue); 138 139 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) { 140 printk("Attempt to release TCP socket in state %d %p\n", 141 sk->sk_state, sk); 142 return; 143 } 144 if (!sock_flag(sk, SOCK_DEAD)) { 145 printk("Attempt to release alive inet socket %p\n", sk); 146 return; 147 } 148 149 BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc)); 150 BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc)); 151 BUG_TRAP(!sk->sk_wmem_queued); 152 BUG_TRAP(!sk->sk_forward_alloc); 153 154 kfree(inet->opt); 155 dst_release(sk->sk_dst_cache); 156 sk_refcnt_debug_dec(sk); 157 } 158 159 /* 160 * The routines beyond this point handle the behaviour of an AF_INET 161 * socket object. Mostly it punts to the subprotocols of IP to do 162 * the work. 163 */ 164 165 /* 166 * Automatically bind an unbound socket. 167 */ 168 169 static int inet_autobind(struct sock *sk) 170 { 171 struct inet_sock *inet; 172 /* We may need to bind the socket. */ 173 lock_sock(sk); 174 inet = inet_sk(sk); 175 if (!inet->num) { 176 if (sk->sk_prot->get_port(sk, 0)) { 177 release_sock(sk); 178 return -EAGAIN; 179 } 180 inet->sport = htons(inet->num); 181 } 182 release_sock(sk); 183 return 0; 184 } 185 186 /* 187 * Move a socket into listening state. 188 */ 189 int inet_listen(struct socket *sock, int backlog) 190 { 191 struct sock *sk = sock->sk; 192 unsigned char old_state; 193 int err; 194 195 lock_sock(sk); 196 197 err = -EINVAL; 198 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM) 199 goto out; 200 201 old_state = sk->sk_state; 202 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN))) 203 goto out; 204 205 /* Really, if the socket is already in listen state 206 * we can only allow the backlog to be adjusted. 207 */ 208 if (old_state != TCP_LISTEN) { 209 err = inet_csk_listen_start(sk, backlog); 210 if (err) 211 goto out; 212 } 213 sk->sk_max_ack_backlog = backlog; 214 err = 0; 215 216 out: 217 release_sock(sk); 218 return err; 219 } 220 221 u32 inet_ehash_secret __read_mostly; 222 EXPORT_SYMBOL(inet_ehash_secret); 223 224 /* 225 * inet_ehash_secret must be set exactly once 226 * Instead of using a dedicated spinlock, we (ab)use inetsw_lock 227 */ 228 void build_ehash_secret(void) 229 { 230 u32 rnd; 231 do { 232 get_random_bytes(&rnd, sizeof(rnd)); 233 } while (rnd == 0); 234 spin_lock_bh(&inetsw_lock); 235 if (!inet_ehash_secret) 236 inet_ehash_secret = rnd; 237 spin_unlock_bh(&inetsw_lock); 238 } 239 EXPORT_SYMBOL(build_ehash_secret); 240 241 /* 242 * Create an inet socket. 243 */ 244 245 static int inet_create(struct socket *sock, int protocol) 246 { 247 struct sock *sk; 248 struct list_head *p; 249 struct inet_protosw *answer; 250 struct inet_sock *inet; 251 struct proto *answer_prot; 252 unsigned char answer_flags; 253 char answer_no_check; 254 int try_loading_module = 0; 255 int err; 256 257 if (sock->type != SOCK_RAW && 258 sock->type != SOCK_DGRAM && 259 !inet_ehash_secret) 260 build_ehash_secret(); 261 262 sock->state = SS_UNCONNECTED; 263 264 /* Look for the requested type/protocol pair. */ 265 answer = NULL; 266 lookup_protocol: 267 err = -ESOCKTNOSUPPORT; 268 rcu_read_lock(); 269 list_for_each_rcu(p, &inetsw[sock->type]) { 270 answer = list_entry(p, struct inet_protosw, list); 271 272 /* Check the non-wild match. */ 273 if (protocol == answer->protocol) { 274 if (protocol != IPPROTO_IP) 275 break; 276 } else { 277 /* Check for the two wild cases. */ 278 if (IPPROTO_IP == protocol) { 279 protocol = answer->protocol; 280 break; 281 } 282 if (IPPROTO_IP == answer->protocol) 283 break; 284 } 285 err = -EPROTONOSUPPORT; 286 answer = NULL; 287 } 288 289 if (unlikely(answer == NULL)) { 290 if (try_loading_module < 2) { 291 rcu_read_unlock(); 292 /* 293 * Be more specific, e.g. net-pf-2-proto-132-type-1 294 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) 295 */ 296 if (++try_loading_module == 1) 297 request_module("net-pf-%d-proto-%d-type-%d", 298 PF_INET, protocol, sock->type); 299 /* 300 * Fall back to generic, e.g. net-pf-2-proto-132 301 * (net-pf-PF_INET-proto-IPPROTO_SCTP) 302 */ 303 else 304 request_module("net-pf-%d-proto-%d", 305 PF_INET, protocol); 306 goto lookup_protocol; 307 } else 308 goto out_rcu_unlock; 309 } 310 311 err = -EPERM; 312 if (answer->capability > 0 && !capable(answer->capability)) 313 goto out_rcu_unlock; 314 315 sock->ops = answer->ops; 316 answer_prot = answer->prot; 317 answer_no_check = answer->no_check; 318 answer_flags = answer->flags; 319 rcu_read_unlock(); 320 321 BUG_TRAP(answer_prot->slab != NULL); 322 323 err = -ENOBUFS; 324 sk = sk_alloc(PF_INET, GFP_KERNEL, answer_prot, 1); 325 if (sk == NULL) 326 goto out; 327 328 err = 0; 329 sk->sk_no_check = answer_no_check; 330 if (INET_PROTOSW_REUSE & answer_flags) 331 sk->sk_reuse = 1; 332 333 inet = inet_sk(sk); 334 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 335 336 if (SOCK_RAW == sock->type) { 337 inet->num = protocol; 338 if (IPPROTO_RAW == protocol) 339 inet->hdrincl = 1; 340 } 341 342 if (ipv4_config.no_pmtu_disc) 343 inet->pmtudisc = IP_PMTUDISC_DONT; 344 else 345 inet->pmtudisc = IP_PMTUDISC_WANT; 346 347 inet->id = 0; 348 349 sock_init_data(sock, sk); 350 351 sk->sk_destruct = inet_sock_destruct; 352 sk->sk_family = PF_INET; 353 sk->sk_protocol = protocol; 354 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 355 356 inet->uc_ttl = -1; 357 inet->mc_loop = 1; 358 inet->mc_ttl = 1; 359 inet->mc_index = 0; 360 inet->mc_list = NULL; 361 362 sk_refcnt_debug_inc(sk); 363 364 if (inet->num) { 365 /* It assumes that any protocol which allows 366 * the user to assign a number at socket 367 * creation time automatically 368 * shares. 369 */ 370 inet->sport = htons(inet->num); 371 /* Add to protocol hash chains. */ 372 sk->sk_prot->hash(sk); 373 } 374 375 if (sk->sk_prot->init) { 376 err = sk->sk_prot->init(sk); 377 if (err) 378 sk_common_release(sk); 379 } 380 out: 381 return err; 382 out_rcu_unlock: 383 rcu_read_unlock(); 384 goto out; 385 } 386 387 388 /* 389 * The peer socket should always be NULL (or else). When we call this 390 * function we are destroying the object and from then on nobody 391 * should refer to it. 392 */ 393 int inet_release(struct socket *sock) 394 { 395 struct sock *sk = sock->sk; 396 397 if (sk) { 398 long timeout; 399 400 /* Applications forget to leave groups before exiting */ 401 ip_mc_drop_socket(sk); 402 403 /* If linger is set, we don't return until the close 404 * is complete. Otherwise we return immediately. The 405 * actually closing is done the same either way. 406 * 407 * If the close is due to the process exiting, we never 408 * linger.. 409 */ 410 timeout = 0; 411 if (sock_flag(sk, SOCK_LINGER) && 412 !(current->flags & PF_EXITING)) 413 timeout = sk->sk_lingertime; 414 sock->sk = NULL; 415 sk->sk_prot->close(sk, timeout); 416 } 417 return 0; 418 } 419 420 /* It is off by default, see below. */ 421 int sysctl_ip_nonlocal_bind __read_mostly; 422 423 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 424 { 425 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 426 struct sock *sk = sock->sk; 427 struct inet_sock *inet = inet_sk(sk); 428 unsigned short snum; 429 int chk_addr_ret; 430 int err; 431 432 /* If the socket has its own bind function then use it. (RAW) */ 433 if (sk->sk_prot->bind) { 434 err = sk->sk_prot->bind(sk, uaddr, addr_len); 435 goto out; 436 } 437 err = -EINVAL; 438 if (addr_len < sizeof(struct sockaddr_in)) 439 goto out; 440 441 chk_addr_ret = inet_addr_type(addr->sin_addr.s_addr); 442 443 /* Not specified by any standard per-se, however it breaks too 444 * many applications when removed. It is unfortunate since 445 * allowing applications to make a non-local bind solves 446 * several problems with systems using dynamic addressing. 447 * (ie. your servers still start up even if your ISDN link 448 * is temporarily down) 449 */ 450 err = -EADDRNOTAVAIL; 451 if (!sysctl_ip_nonlocal_bind && 452 !inet->freebind && 453 addr->sin_addr.s_addr != INADDR_ANY && 454 chk_addr_ret != RTN_LOCAL && 455 chk_addr_ret != RTN_MULTICAST && 456 chk_addr_ret != RTN_BROADCAST) 457 goto out; 458 459 snum = ntohs(addr->sin_port); 460 err = -EACCES; 461 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) 462 goto out; 463 464 /* We keep a pair of addresses. rcv_saddr is the one 465 * used by hash lookups, and saddr is used for transmit. 466 * 467 * In the BSD API these are the same except where it 468 * would be illegal to use them (multicast/broadcast) in 469 * which case the sending device address is used. 470 */ 471 lock_sock(sk); 472 473 /* Check these errors (active socket, double bind). */ 474 err = -EINVAL; 475 if (sk->sk_state != TCP_CLOSE || inet->num) 476 goto out_release_sock; 477 478 inet->rcv_saddr = inet->saddr = addr->sin_addr.s_addr; 479 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 480 inet->saddr = 0; /* Use device */ 481 482 /* Make sure we are allowed to bind here. */ 483 if (sk->sk_prot->get_port(sk, snum)) { 484 inet->saddr = inet->rcv_saddr = 0; 485 err = -EADDRINUSE; 486 goto out_release_sock; 487 } 488 489 if (inet->rcv_saddr) 490 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 491 if (snum) 492 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 493 inet->sport = htons(inet->num); 494 inet->daddr = 0; 495 inet->dport = 0; 496 sk_dst_reset(sk); 497 err = 0; 498 out_release_sock: 499 release_sock(sk); 500 out: 501 return err; 502 } 503 504 int inet_dgram_connect(struct socket *sock, struct sockaddr * uaddr, 505 int addr_len, int flags) 506 { 507 struct sock *sk = sock->sk; 508 509 if (uaddr->sa_family == AF_UNSPEC) 510 return sk->sk_prot->disconnect(sk, flags); 511 512 if (!inet_sk(sk)->num && inet_autobind(sk)) 513 return -EAGAIN; 514 return sk->sk_prot->connect(sk, (struct sockaddr *)uaddr, addr_len); 515 } 516 517 static long inet_wait_for_connect(struct sock *sk, long timeo) 518 { 519 DEFINE_WAIT(wait); 520 521 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 522 523 /* Basic assumption: if someone sets sk->sk_err, he _must_ 524 * change state of the socket from TCP_SYN_*. 525 * Connect() does not allow to get error notifications 526 * without closing the socket. 527 */ 528 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 529 release_sock(sk); 530 timeo = schedule_timeout(timeo); 531 lock_sock(sk); 532 if (signal_pending(current) || !timeo) 533 break; 534 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 535 } 536 finish_wait(sk->sk_sleep, &wait); 537 return timeo; 538 } 539 540 /* 541 * Connect to a remote host. There is regrettably still a little 542 * TCP 'magic' in here. 543 */ 544 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 545 int addr_len, int flags) 546 { 547 struct sock *sk = sock->sk; 548 int err; 549 long timeo; 550 551 lock_sock(sk); 552 553 if (uaddr->sa_family == AF_UNSPEC) { 554 err = sk->sk_prot->disconnect(sk, flags); 555 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 556 goto out; 557 } 558 559 switch (sock->state) { 560 default: 561 err = -EINVAL; 562 goto out; 563 case SS_CONNECTED: 564 err = -EISCONN; 565 goto out; 566 case SS_CONNECTING: 567 err = -EALREADY; 568 /* Fall out of switch with err, set for this state */ 569 break; 570 case SS_UNCONNECTED: 571 err = -EISCONN; 572 if (sk->sk_state != TCP_CLOSE) 573 goto out; 574 575 err = sk->sk_prot->connect(sk, uaddr, addr_len); 576 if (err < 0) 577 goto out; 578 579 sock->state = SS_CONNECTING; 580 581 /* Just entered SS_CONNECTING state; the only 582 * difference is that return value in non-blocking 583 * case is EINPROGRESS, rather than EALREADY. 584 */ 585 err = -EINPROGRESS; 586 break; 587 } 588 589 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 590 591 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 592 /* Error code is set above */ 593 if (!timeo || !inet_wait_for_connect(sk, timeo)) 594 goto out; 595 596 err = sock_intr_errno(timeo); 597 if (signal_pending(current)) 598 goto out; 599 } 600 601 /* Connection was closed by RST, timeout, ICMP error 602 * or another process disconnected us. 603 */ 604 if (sk->sk_state == TCP_CLOSE) 605 goto sock_error; 606 607 /* sk->sk_err may be not zero now, if RECVERR was ordered by user 608 * and error was received after socket entered established state. 609 * Hence, it is handled normally after connect() return successfully. 610 */ 611 612 sock->state = SS_CONNECTED; 613 err = 0; 614 out: 615 release_sock(sk); 616 return err; 617 618 sock_error: 619 err = sock_error(sk) ? : -ECONNABORTED; 620 sock->state = SS_UNCONNECTED; 621 if (sk->sk_prot->disconnect(sk, flags)) 622 sock->state = SS_DISCONNECTING; 623 goto out; 624 } 625 626 /* 627 * Accept a pending connection. The TCP layer now gives BSD semantics. 628 */ 629 630 int inet_accept(struct socket *sock, struct socket *newsock, int flags) 631 { 632 struct sock *sk1 = sock->sk; 633 int err = -EINVAL; 634 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err); 635 636 if (!sk2) 637 goto do_err; 638 639 lock_sock(sk2); 640 641 BUG_TRAP((1 << sk2->sk_state) & 642 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE)); 643 644 sock_graft(sk2, newsock); 645 646 newsock->state = SS_CONNECTED; 647 err = 0; 648 release_sock(sk2); 649 do_err: 650 return err; 651 } 652 653 654 /* 655 * This does both peername and sockname. 656 */ 657 int inet_getname(struct socket *sock, struct sockaddr *uaddr, 658 int *uaddr_len, int peer) 659 { 660 struct sock *sk = sock->sk; 661 struct inet_sock *inet = inet_sk(sk); 662 struct sockaddr_in *sin = (struct sockaddr_in *)uaddr; 663 664 sin->sin_family = AF_INET; 665 if (peer) { 666 if (!inet->dport || 667 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 668 peer == 1)) 669 return -ENOTCONN; 670 sin->sin_port = inet->dport; 671 sin->sin_addr.s_addr = inet->daddr; 672 } else { 673 __be32 addr = inet->rcv_saddr; 674 if (!addr) 675 addr = inet->saddr; 676 sin->sin_port = inet->sport; 677 sin->sin_addr.s_addr = addr; 678 } 679 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 680 *uaddr_len = sizeof(*sin); 681 return 0; 682 } 683 684 int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 685 size_t size) 686 { 687 struct sock *sk = sock->sk; 688 689 /* We may need to bind the socket. */ 690 if (!inet_sk(sk)->num && inet_autobind(sk)) 691 return -EAGAIN; 692 693 return sk->sk_prot->sendmsg(iocb, sk, msg, size); 694 } 695 696 697 static ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) 698 { 699 struct sock *sk = sock->sk; 700 701 /* We may need to bind the socket. */ 702 if (!inet_sk(sk)->num && inet_autobind(sk)) 703 return -EAGAIN; 704 705 if (sk->sk_prot->sendpage) 706 return sk->sk_prot->sendpage(sk, page, offset, size, flags); 707 return sock_no_sendpage(sock, page, offset, size, flags); 708 } 709 710 711 int inet_shutdown(struct socket *sock, int how) 712 { 713 struct sock *sk = sock->sk; 714 int err = 0; 715 716 /* This should really check to make sure 717 * the socket is a TCP socket. (WHY AC...) 718 */ 719 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and 720 1->2 bit 2 snds. 721 2->3 */ 722 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ 723 return -EINVAL; 724 725 lock_sock(sk); 726 if (sock->state == SS_CONNECTING) { 727 if ((1 << sk->sk_state) & 728 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) 729 sock->state = SS_DISCONNECTING; 730 else 731 sock->state = SS_CONNECTED; 732 } 733 734 switch (sk->sk_state) { 735 case TCP_CLOSE: 736 err = -ENOTCONN; 737 /* Hack to wake up other listeners, who can poll for 738 POLLHUP, even on eg. unconnected UDP sockets -- RR */ 739 default: 740 sk->sk_shutdown |= how; 741 if (sk->sk_prot->shutdown) 742 sk->sk_prot->shutdown(sk, how); 743 break; 744 745 /* Remaining two branches are temporary solution for missing 746 * close() in multithreaded environment. It is _not_ a good idea, 747 * but we have no choice until close() is repaired at VFS level. 748 */ 749 case TCP_LISTEN: 750 if (!(how & RCV_SHUTDOWN)) 751 break; 752 /* Fall through */ 753 case TCP_SYN_SENT: 754 err = sk->sk_prot->disconnect(sk, O_NONBLOCK); 755 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 756 break; 757 } 758 759 /* Wake up anyone sleeping in poll. */ 760 sk->sk_state_change(sk); 761 release_sock(sk); 762 return err; 763 } 764 765 /* 766 * ioctl() calls you can issue on an INET socket. Most of these are 767 * device configuration and stuff and very rarely used. Some ioctls 768 * pass on to the socket itself. 769 * 770 * NOTE: I like the idea of a module for the config stuff. ie ifconfig 771 * loads the devconfigure module does its configuring and unloads it. 772 * There's a good 20K of config code hanging around the kernel. 773 */ 774 775 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 776 { 777 struct sock *sk = sock->sk; 778 int err = 0; 779 780 switch (cmd) { 781 case SIOCGSTAMP: 782 err = sock_get_timestamp(sk, (struct timeval __user *)arg); 783 break; 784 case SIOCGSTAMPNS: 785 err = sock_get_timestampns(sk, (struct timespec __user *)arg); 786 break; 787 case SIOCADDRT: 788 case SIOCDELRT: 789 case SIOCRTMSG: 790 err = ip_rt_ioctl(cmd, (void __user *)arg); 791 break; 792 case SIOCDARP: 793 case SIOCGARP: 794 case SIOCSARP: 795 err = arp_ioctl(cmd, (void __user *)arg); 796 break; 797 case SIOCGIFADDR: 798 case SIOCSIFADDR: 799 case SIOCGIFBRDADDR: 800 case SIOCSIFBRDADDR: 801 case SIOCGIFNETMASK: 802 case SIOCSIFNETMASK: 803 case SIOCGIFDSTADDR: 804 case SIOCSIFDSTADDR: 805 case SIOCSIFPFLAGS: 806 case SIOCGIFPFLAGS: 807 case SIOCSIFFLAGS: 808 err = devinet_ioctl(cmd, (void __user *)arg); 809 break; 810 default: 811 if (sk->sk_prot->ioctl) 812 err = sk->sk_prot->ioctl(sk, cmd, arg); 813 else 814 err = -ENOIOCTLCMD; 815 break; 816 } 817 return err; 818 } 819 820 const struct proto_ops inet_stream_ops = { 821 .family = PF_INET, 822 .owner = THIS_MODULE, 823 .release = inet_release, 824 .bind = inet_bind, 825 .connect = inet_stream_connect, 826 .socketpair = sock_no_socketpair, 827 .accept = inet_accept, 828 .getname = inet_getname, 829 .poll = tcp_poll, 830 .ioctl = inet_ioctl, 831 .listen = inet_listen, 832 .shutdown = inet_shutdown, 833 .setsockopt = sock_common_setsockopt, 834 .getsockopt = sock_common_getsockopt, 835 .sendmsg = inet_sendmsg, 836 .recvmsg = sock_common_recvmsg, 837 .mmap = sock_no_mmap, 838 .sendpage = tcp_sendpage, 839 #ifdef CONFIG_COMPAT 840 .compat_setsockopt = compat_sock_common_setsockopt, 841 .compat_getsockopt = compat_sock_common_getsockopt, 842 #endif 843 }; 844 845 const struct proto_ops inet_dgram_ops = { 846 .family = PF_INET, 847 .owner = THIS_MODULE, 848 .release = inet_release, 849 .bind = inet_bind, 850 .connect = inet_dgram_connect, 851 .socketpair = sock_no_socketpair, 852 .accept = sock_no_accept, 853 .getname = inet_getname, 854 .poll = udp_poll, 855 .ioctl = inet_ioctl, 856 .listen = sock_no_listen, 857 .shutdown = inet_shutdown, 858 .setsockopt = sock_common_setsockopt, 859 .getsockopt = sock_common_getsockopt, 860 .sendmsg = inet_sendmsg, 861 .recvmsg = sock_common_recvmsg, 862 .mmap = sock_no_mmap, 863 .sendpage = inet_sendpage, 864 #ifdef CONFIG_COMPAT 865 .compat_setsockopt = compat_sock_common_setsockopt, 866 .compat_getsockopt = compat_sock_common_getsockopt, 867 #endif 868 }; 869 870 /* 871 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 872 * udp_poll 873 */ 874 static const struct proto_ops inet_sockraw_ops = { 875 .family = PF_INET, 876 .owner = THIS_MODULE, 877 .release = inet_release, 878 .bind = inet_bind, 879 .connect = inet_dgram_connect, 880 .socketpair = sock_no_socketpair, 881 .accept = sock_no_accept, 882 .getname = inet_getname, 883 .poll = datagram_poll, 884 .ioctl = inet_ioctl, 885 .listen = sock_no_listen, 886 .shutdown = inet_shutdown, 887 .setsockopt = sock_common_setsockopt, 888 .getsockopt = sock_common_getsockopt, 889 .sendmsg = inet_sendmsg, 890 .recvmsg = sock_common_recvmsg, 891 .mmap = sock_no_mmap, 892 .sendpage = inet_sendpage, 893 #ifdef CONFIG_COMPAT 894 .compat_setsockopt = compat_sock_common_setsockopt, 895 .compat_getsockopt = compat_sock_common_getsockopt, 896 #endif 897 }; 898 899 static struct net_proto_family inet_family_ops = { 900 .family = PF_INET, 901 .create = inet_create, 902 .owner = THIS_MODULE, 903 }; 904 905 /* Upon startup we insert all the elements in inetsw_array[] into 906 * the linked list inetsw. 907 */ 908 static struct inet_protosw inetsw_array[] = 909 { 910 { 911 .type = SOCK_STREAM, 912 .protocol = IPPROTO_TCP, 913 .prot = &tcp_prot, 914 .ops = &inet_stream_ops, 915 .capability = -1, 916 .no_check = 0, 917 .flags = INET_PROTOSW_PERMANENT | 918 INET_PROTOSW_ICSK, 919 }, 920 921 { 922 .type = SOCK_DGRAM, 923 .protocol = IPPROTO_UDP, 924 .prot = &udp_prot, 925 .ops = &inet_dgram_ops, 926 .capability = -1, 927 .no_check = UDP_CSUM_DEFAULT, 928 .flags = INET_PROTOSW_PERMANENT, 929 }, 930 931 932 { 933 .type = SOCK_RAW, 934 .protocol = IPPROTO_IP, /* wild card */ 935 .prot = &raw_prot, 936 .ops = &inet_sockraw_ops, 937 .capability = CAP_NET_RAW, 938 .no_check = UDP_CSUM_DEFAULT, 939 .flags = INET_PROTOSW_REUSE, 940 } 941 }; 942 943 #define INETSW_ARRAY_LEN (sizeof(inetsw_array) / sizeof(struct inet_protosw)) 944 945 void inet_register_protosw(struct inet_protosw *p) 946 { 947 struct list_head *lh; 948 struct inet_protosw *answer; 949 int protocol = p->protocol; 950 struct list_head *last_perm; 951 952 spin_lock_bh(&inetsw_lock); 953 954 if (p->type >= SOCK_MAX) 955 goto out_illegal; 956 957 /* If we are trying to override a permanent protocol, bail. */ 958 answer = NULL; 959 last_perm = &inetsw[p->type]; 960 list_for_each(lh, &inetsw[p->type]) { 961 answer = list_entry(lh, struct inet_protosw, list); 962 963 /* Check only the non-wild match. */ 964 if (INET_PROTOSW_PERMANENT & answer->flags) { 965 if (protocol == answer->protocol) 966 break; 967 last_perm = lh; 968 } 969 970 answer = NULL; 971 } 972 if (answer) 973 goto out_permanent; 974 975 /* Add the new entry after the last permanent entry if any, so that 976 * the new entry does not override a permanent entry when matched with 977 * a wild-card protocol. But it is allowed to override any existing 978 * non-permanent entry. This means that when we remove this entry, the 979 * system automatically returns to the old behavior. 980 */ 981 list_add_rcu(&p->list, last_perm); 982 out: 983 spin_unlock_bh(&inetsw_lock); 984 985 synchronize_net(); 986 987 return; 988 989 out_permanent: 990 printk(KERN_ERR "Attempt to override permanent protocol %d.\n", 991 protocol); 992 goto out; 993 994 out_illegal: 995 printk(KERN_ERR 996 "Ignoring attempt to register invalid socket type %d.\n", 997 p->type); 998 goto out; 999 } 1000 1001 void inet_unregister_protosw(struct inet_protosw *p) 1002 { 1003 if (INET_PROTOSW_PERMANENT & p->flags) { 1004 printk(KERN_ERR 1005 "Attempt to unregister permanent protocol %d.\n", 1006 p->protocol); 1007 } else { 1008 spin_lock_bh(&inetsw_lock); 1009 list_del_rcu(&p->list); 1010 spin_unlock_bh(&inetsw_lock); 1011 1012 synchronize_net(); 1013 } 1014 } 1015 1016 /* 1017 * Shall we try to damage output packets if routing dev changes? 1018 */ 1019 1020 int sysctl_ip_dynaddr __read_mostly; 1021 1022 static int inet_sk_reselect_saddr(struct sock *sk) 1023 { 1024 struct inet_sock *inet = inet_sk(sk); 1025 int err; 1026 struct rtable *rt; 1027 __be32 old_saddr = inet->saddr; 1028 __be32 new_saddr; 1029 __be32 daddr = inet->daddr; 1030 1031 if (inet->opt && inet->opt->srr) 1032 daddr = inet->opt->faddr; 1033 1034 /* Query new route. */ 1035 err = ip_route_connect(&rt, daddr, 0, 1036 RT_CONN_FLAGS(sk), 1037 sk->sk_bound_dev_if, 1038 sk->sk_protocol, 1039 inet->sport, inet->dport, sk, 0); 1040 if (err) 1041 return err; 1042 1043 sk_setup_caps(sk, &rt->u.dst); 1044 1045 new_saddr = rt->rt_src; 1046 1047 if (new_saddr == old_saddr) 1048 return 0; 1049 1050 if (sysctl_ip_dynaddr > 1) { 1051 printk(KERN_INFO "%s(): shifting inet->" 1052 "saddr from %d.%d.%d.%d to %d.%d.%d.%d\n", 1053 __FUNCTION__, 1054 NIPQUAD(old_saddr), 1055 NIPQUAD(new_saddr)); 1056 } 1057 1058 inet->saddr = inet->rcv_saddr = new_saddr; 1059 1060 /* 1061 * XXX The only one ugly spot where we need to 1062 * XXX really change the sockets identity after 1063 * XXX it has entered the hashes. -DaveM 1064 * 1065 * Besides that, it does not check for connection 1066 * uniqueness. Wait for troubles. 1067 */ 1068 __sk_prot_rehash(sk); 1069 return 0; 1070 } 1071 1072 int inet_sk_rebuild_header(struct sock *sk) 1073 { 1074 struct inet_sock *inet = inet_sk(sk); 1075 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); 1076 __be32 daddr; 1077 int err; 1078 1079 /* Route is OK, nothing to do. */ 1080 if (rt) 1081 return 0; 1082 1083 /* Reroute. */ 1084 daddr = inet->daddr; 1085 if (inet->opt && inet->opt->srr) 1086 daddr = inet->opt->faddr; 1087 { 1088 struct flowi fl = { 1089 .oif = sk->sk_bound_dev_if, 1090 .nl_u = { 1091 .ip4_u = { 1092 .daddr = daddr, 1093 .saddr = inet->saddr, 1094 .tos = RT_CONN_FLAGS(sk), 1095 }, 1096 }, 1097 .proto = sk->sk_protocol, 1098 .uli_u = { 1099 .ports = { 1100 .sport = inet->sport, 1101 .dport = inet->dport, 1102 }, 1103 }, 1104 }; 1105 1106 security_sk_classify_flow(sk, &fl); 1107 err = ip_route_output_flow(&rt, &fl, sk, 0); 1108 } 1109 if (!err) 1110 sk_setup_caps(sk, &rt->u.dst); 1111 else { 1112 /* Routing failed... */ 1113 sk->sk_route_caps = 0; 1114 /* 1115 * Other protocols have to map its equivalent state to TCP_SYN_SENT. 1116 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme 1117 */ 1118 if (!sysctl_ip_dynaddr || 1119 sk->sk_state != TCP_SYN_SENT || 1120 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 1121 (err = inet_sk_reselect_saddr(sk)) != 0) 1122 sk->sk_err_soft = -err; 1123 } 1124 1125 return err; 1126 } 1127 1128 EXPORT_SYMBOL(inet_sk_rebuild_header); 1129 1130 static int inet_gso_send_check(struct sk_buff *skb) 1131 { 1132 struct iphdr *iph; 1133 struct net_protocol *ops; 1134 int proto; 1135 int ihl; 1136 int err = -EINVAL; 1137 1138 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1139 goto out; 1140 1141 iph = ip_hdr(skb); 1142 ihl = iph->ihl * 4; 1143 if (ihl < sizeof(*iph)) 1144 goto out; 1145 1146 if (unlikely(!pskb_may_pull(skb, ihl))) 1147 goto out; 1148 1149 __skb_pull(skb, ihl); 1150 skb_reset_transport_header(skb); 1151 iph = ip_hdr(skb); 1152 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1153 err = -EPROTONOSUPPORT; 1154 1155 rcu_read_lock(); 1156 ops = rcu_dereference(inet_protos[proto]); 1157 if (likely(ops && ops->gso_send_check)) 1158 err = ops->gso_send_check(skb); 1159 rcu_read_unlock(); 1160 1161 out: 1162 return err; 1163 } 1164 1165 static struct sk_buff *inet_gso_segment(struct sk_buff *skb, int features) 1166 { 1167 struct sk_buff *segs = ERR_PTR(-EINVAL); 1168 struct iphdr *iph; 1169 struct net_protocol *ops; 1170 int proto; 1171 int ihl; 1172 int id; 1173 1174 if (unlikely(skb_shinfo(skb)->gso_type & 1175 ~(SKB_GSO_TCPV4 | 1176 SKB_GSO_UDP | 1177 SKB_GSO_DODGY | 1178 SKB_GSO_TCP_ECN | 1179 0))) 1180 goto out; 1181 1182 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1183 goto out; 1184 1185 iph = ip_hdr(skb); 1186 ihl = iph->ihl * 4; 1187 if (ihl < sizeof(*iph)) 1188 goto out; 1189 1190 if (unlikely(!pskb_may_pull(skb, ihl))) 1191 goto out; 1192 1193 __skb_pull(skb, ihl); 1194 skb_reset_transport_header(skb); 1195 iph = ip_hdr(skb); 1196 id = ntohs(iph->id); 1197 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1198 segs = ERR_PTR(-EPROTONOSUPPORT); 1199 1200 rcu_read_lock(); 1201 ops = rcu_dereference(inet_protos[proto]); 1202 if (likely(ops && ops->gso_segment)) 1203 segs = ops->gso_segment(skb, features); 1204 rcu_read_unlock(); 1205 1206 if (!segs || unlikely(IS_ERR(segs))) 1207 goto out; 1208 1209 skb = segs; 1210 do { 1211 iph = ip_hdr(skb); 1212 iph->id = htons(id++); 1213 iph->tot_len = htons(skb->len - skb->mac_len); 1214 iph->check = 0; 1215 iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl); 1216 } while ((skb = skb->next)); 1217 1218 out: 1219 return segs; 1220 } 1221 1222 unsigned long snmp_fold_field(void *mib[], int offt) 1223 { 1224 unsigned long res = 0; 1225 int i; 1226 1227 for_each_possible_cpu(i) { 1228 res += *(((unsigned long *) per_cpu_ptr(mib[0], i)) + offt); 1229 res += *(((unsigned long *) per_cpu_ptr(mib[1], i)) + offt); 1230 } 1231 return res; 1232 } 1233 EXPORT_SYMBOL_GPL(snmp_fold_field); 1234 1235 int snmp_mib_init(void *ptr[2], size_t mibsize, size_t mibalign) 1236 { 1237 BUG_ON(ptr == NULL); 1238 ptr[0] = __alloc_percpu(mibsize); 1239 if (!ptr[0]) 1240 goto err0; 1241 ptr[1] = __alloc_percpu(mibsize); 1242 if (!ptr[1]) 1243 goto err1; 1244 return 0; 1245 err1: 1246 free_percpu(ptr[0]); 1247 ptr[0] = NULL; 1248 err0: 1249 return -ENOMEM; 1250 } 1251 EXPORT_SYMBOL_GPL(snmp_mib_init); 1252 1253 void snmp_mib_free(void *ptr[2]) 1254 { 1255 BUG_ON(ptr == NULL); 1256 free_percpu(ptr[0]); 1257 free_percpu(ptr[1]); 1258 ptr[0] = ptr[1] = NULL; 1259 } 1260 EXPORT_SYMBOL_GPL(snmp_mib_free); 1261 1262 #ifdef CONFIG_IP_MULTICAST 1263 static struct net_protocol igmp_protocol = { 1264 .handler = igmp_rcv, 1265 }; 1266 #endif 1267 1268 static struct net_protocol tcp_protocol = { 1269 .handler = tcp_v4_rcv, 1270 .err_handler = tcp_v4_err, 1271 .gso_send_check = tcp_v4_gso_send_check, 1272 .gso_segment = tcp_tso_segment, 1273 .no_policy = 1, 1274 }; 1275 1276 static struct net_protocol udp_protocol = { 1277 .handler = udp_rcv, 1278 .err_handler = udp_err, 1279 .no_policy = 1, 1280 }; 1281 1282 static struct net_protocol icmp_protocol = { 1283 .handler = icmp_rcv, 1284 }; 1285 1286 static int __init init_ipv4_mibs(void) 1287 { 1288 if (snmp_mib_init((void **)net_statistics, 1289 sizeof(struct linux_mib), 1290 __alignof__(struct linux_mib)) < 0) 1291 goto err_net_mib; 1292 if (snmp_mib_init((void **)ip_statistics, 1293 sizeof(struct ipstats_mib), 1294 __alignof__(struct ipstats_mib)) < 0) 1295 goto err_ip_mib; 1296 if (snmp_mib_init((void **)icmp_statistics, 1297 sizeof(struct icmp_mib), 1298 __alignof__(struct icmp_mib)) < 0) 1299 goto err_icmp_mib; 1300 if (snmp_mib_init((void **)tcp_statistics, 1301 sizeof(struct tcp_mib), 1302 __alignof__(struct tcp_mib)) < 0) 1303 goto err_tcp_mib; 1304 if (snmp_mib_init((void **)udp_statistics, 1305 sizeof(struct udp_mib), 1306 __alignof__(struct udp_mib)) < 0) 1307 goto err_udp_mib; 1308 if (snmp_mib_init((void **)udplite_statistics, 1309 sizeof(struct udp_mib), 1310 __alignof__(struct udp_mib)) < 0) 1311 goto err_udplite_mib; 1312 1313 tcp_mib_init(); 1314 1315 return 0; 1316 1317 err_udplite_mib: 1318 snmp_mib_free((void **)udp_statistics); 1319 err_udp_mib: 1320 snmp_mib_free((void **)tcp_statistics); 1321 err_tcp_mib: 1322 snmp_mib_free((void **)icmp_statistics); 1323 err_icmp_mib: 1324 snmp_mib_free((void **)ip_statistics); 1325 err_ip_mib: 1326 snmp_mib_free((void **)net_statistics); 1327 err_net_mib: 1328 return -ENOMEM; 1329 } 1330 1331 static int ipv4_proc_init(void); 1332 1333 /* 1334 * IP protocol layer initialiser 1335 */ 1336 1337 static struct packet_type ip_packet_type = { 1338 .type = __constant_htons(ETH_P_IP), 1339 .func = ip_rcv, 1340 .gso_send_check = inet_gso_send_check, 1341 .gso_segment = inet_gso_segment, 1342 }; 1343 1344 static int __init inet_init(void) 1345 { 1346 struct sk_buff *dummy_skb; 1347 struct inet_protosw *q; 1348 struct list_head *r; 1349 int rc = -EINVAL; 1350 1351 BUILD_BUG_ON(sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb)); 1352 1353 rc = proto_register(&tcp_prot, 1); 1354 if (rc) 1355 goto out; 1356 1357 rc = proto_register(&udp_prot, 1); 1358 if (rc) 1359 goto out_unregister_tcp_proto; 1360 1361 rc = proto_register(&raw_prot, 1); 1362 if (rc) 1363 goto out_unregister_udp_proto; 1364 1365 /* 1366 * Tell SOCKET that we are alive... 1367 */ 1368 1369 (void)sock_register(&inet_family_ops); 1370 1371 /* 1372 * Add all the base protocols. 1373 */ 1374 1375 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 1376 printk(KERN_CRIT "inet_init: Cannot add ICMP protocol\n"); 1377 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) 1378 printk(KERN_CRIT "inet_init: Cannot add UDP protocol\n"); 1379 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) 1380 printk(KERN_CRIT "inet_init: Cannot add TCP protocol\n"); 1381 #ifdef CONFIG_IP_MULTICAST 1382 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 1383 printk(KERN_CRIT "inet_init: Cannot add IGMP protocol\n"); 1384 #endif 1385 1386 /* Register the socket-side information for inet_create. */ 1387 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 1388 INIT_LIST_HEAD(r); 1389 1390 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 1391 inet_register_protosw(q); 1392 1393 /* 1394 * Set the ARP module up 1395 */ 1396 1397 arp_init(); 1398 1399 /* 1400 * Set the IP module up 1401 */ 1402 1403 ip_init(); 1404 1405 tcp_v4_init(&inet_family_ops); 1406 1407 /* Setup TCP slab cache for open requests. */ 1408 tcp_init(); 1409 1410 /* Add UDP-Lite (RFC 3828) */ 1411 udplite4_register(); 1412 1413 /* 1414 * Set the ICMP layer up 1415 */ 1416 1417 icmp_init(&inet_family_ops); 1418 1419 /* 1420 * Initialise the multicast router 1421 */ 1422 #if defined(CONFIG_IP_MROUTE) 1423 ip_mr_init(); 1424 #endif 1425 /* 1426 * Initialise per-cpu ipv4 mibs 1427 */ 1428 1429 if (init_ipv4_mibs()) 1430 printk(KERN_CRIT "inet_init: Cannot init ipv4 mibs\n"); ; 1431 1432 ipv4_proc_init(); 1433 1434 ipfrag_init(); 1435 1436 dev_add_pack(&ip_packet_type); 1437 1438 rc = 0; 1439 out: 1440 return rc; 1441 out_unregister_udp_proto: 1442 proto_unregister(&udp_prot); 1443 out_unregister_tcp_proto: 1444 proto_unregister(&tcp_prot); 1445 goto out; 1446 } 1447 1448 fs_initcall(inet_init); 1449 1450 /* ------------------------------------------------------------------------ */ 1451 1452 #ifdef CONFIG_PROC_FS 1453 static int __init ipv4_proc_init(void) 1454 { 1455 int rc = 0; 1456 1457 if (raw_proc_init()) 1458 goto out_raw; 1459 if (tcp4_proc_init()) 1460 goto out_tcp; 1461 if (udp4_proc_init()) 1462 goto out_udp; 1463 if (fib_proc_init()) 1464 goto out_fib; 1465 if (ip_misc_proc_init()) 1466 goto out_misc; 1467 out: 1468 return rc; 1469 out_misc: 1470 fib_proc_exit(); 1471 out_fib: 1472 udp4_proc_exit(); 1473 out_udp: 1474 tcp4_proc_exit(); 1475 out_tcp: 1476 raw_proc_exit(); 1477 out_raw: 1478 rc = -ENOMEM; 1479 goto out; 1480 } 1481 1482 #else /* CONFIG_PROC_FS */ 1483 static int __init ipv4_proc_init(void) 1484 { 1485 return 0; 1486 } 1487 #endif /* CONFIG_PROC_FS */ 1488 1489 MODULE_ALIAS_NETPROTO(PF_INET); 1490 1491 EXPORT_SYMBOL(inet_accept); 1492 EXPORT_SYMBOL(inet_bind); 1493 EXPORT_SYMBOL(inet_dgram_connect); 1494 EXPORT_SYMBOL(inet_dgram_ops); 1495 EXPORT_SYMBOL(inet_getname); 1496 EXPORT_SYMBOL(inet_ioctl); 1497 EXPORT_SYMBOL(inet_listen); 1498 EXPORT_SYMBOL(inet_register_protosw); 1499 EXPORT_SYMBOL(inet_release); 1500 EXPORT_SYMBOL(inet_sendmsg); 1501 EXPORT_SYMBOL(inet_shutdown); 1502 EXPORT_SYMBOL(inet_sock_destruct); 1503 EXPORT_SYMBOL(inet_stream_connect); 1504 EXPORT_SYMBOL(inet_stream_ops); 1505 EXPORT_SYMBOL(inet_unregister_protosw); 1506 EXPORT_SYMBOL(net_statistics); 1507 EXPORT_SYMBOL(sysctl_ip_nonlocal_bind); 1508