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 struct ipv4_config ipv4_config; 130 131 EXPORT_SYMBOL(ipv4_config); 132 133 /* New destruction routine */ 134 135 void 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 */ 173 174 static 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 */ 194 int 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; 220 221 out: 222 release_sock(sk); 223 return err; 224 } 225 226 u32 inet_ehash_secret __read_mostly; 227 EXPORT_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 */ 233 void 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 } 244 EXPORT_SYMBOL(build_ehash_secret); 245 246 /* 247 * Create an inet socket. 248 */ 249 250 static 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; 274 lookup_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 } 388 out: 389 return err; 390 out_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 */ 401 int 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. */ 429 int sysctl_ip_nonlocal_bind __read_mostly; 430 431 int 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; 506 out_release_sock: 507 release_sock(sk); 508 out: 509 return err; 510 } 511 512 int 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 } 524 525 static 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 */ 552 int 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; 622 out: 623 release_sock(sk); 624 return err; 625 626 sock_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 */ 637 638 int 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); 657 do_err: 658 return err; 659 } 660 661 662 /* 663 * This does both peername and sockname. 664 */ 665 int 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 } 691 692 int 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 } 703 704 705 static 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 } 717 718 719 int 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 */ 782 783 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 784 { 785 struct sock *sk = sock->sk; 786 int err = 0; 787 788 switch (cmd) { 789 case SIOCGSTAMP: 790 err = sock_get_timestamp(sk, (struct timeval __user *)arg); 791 break; 792 case SIOCGSTAMPNS: 793 err = sock_get_timestampns(sk, (struct timespec __user *)arg); 794 break; 795 case SIOCADDRT: 796 case SIOCDELRT: 797 case SIOCRTMSG: 798 err = ip_rt_ioctl(sk->sk_net, cmd, (void __user *)arg); 799 break; 800 case SIOCDARP: 801 case SIOCGARP: 802 case SIOCSARP: 803 err = arp_ioctl(sk->sk_net, cmd, (void __user *)arg); 804 break; 805 case SIOCGIFADDR: 806 case SIOCSIFADDR: 807 case SIOCGIFBRDADDR: 808 case SIOCSIFBRDADDR: 809 case SIOCGIFNETMASK: 810 case SIOCSIFNETMASK: 811 case SIOCGIFDSTADDR: 812 case SIOCSIFDSTADDR: 813 case SIOCSIFPFLAGS: 814 case SIOCGIFPFLAGS: 815 case SIOCSIFFLAGS: 816 err = devinet_ioctl(cmd, (void __user *)arg); 817 break; 818 default: 819 if (sk->sk_prot->ioctl) 820 err = sk->sk_prot->ioctl(sk, cmd, arg); 821 else 822 err = -ENOIOCTLCMD; 823 break; 824 } 825 return err; 826 } 827 828 const struct proto_ops inet_stream_ops = { 829 .family = PF_INET, 830 .owner = THIS_MODULE, 831 .release = inet_release, 832 .bind = inet_bind, 833 .connect = inet_stream_connect, 834 .socketpair = sock_no_socketpair, 835 .accept = inet_accept, 836 .getname = inet_getname, 837 .poll = tcp_poll, 838 .ioctl = inet_ioctl, 839 .listen = inet_listen, 840 .shutdown = inet_shutdown, 841 .setsockopt = sock_common_setsockopt, 842 .getsockopt = sock_common_getsockopt, 843 .sendmsg = tcp_sendmsg, 844 .recvmsg = sock_common_recvmsg, 845 .mmap = sock_no_mmap, 846 .sendpage = tcp_sendpage, 847 .splice_read = tcp_splice_read, 848 #ifdef CONFIG_COMPAT 849 .compat_setsockopt = compat_sock_common_setsockopt, 850 .compat_getsockopt = compat_sock_common_getsockopt, 851 #endif 852 }; 853 854 const struct proto_ops inet_dgram_ops = { 855 .family = PF_INET, 856 .owner = THIS_MODULE, 857 .release = inet_release, 858 .bind = inet_bind, 859 .connect = inet_dgram_connect, 860 .socketpair = sock_no_socketpair, 861 .accept = sock_no_accept, 862 .getname = inet_getname, 863 .poll = udp_poll, 864 .ioctl = inet_ioctl, 865 .listen = sock_no_listen, 866 .shutdown = inet_shutdown, 867 .setsockopt = sock_common_setsockopt, 868 .getsockopt = sock_common_getsockopt, 869 .sendmsg = inet_sendmsg, 870 .recvmsg = sock_common_recvmsg, 871 .mmap = sock_no_mmap, 872 .sendpage = inet_sendpage, 873 #ifdef CONFIG_COMPAT 874 .compat_setsockopt = compat_sock_common_setsockopt, 875 .compat_getsockopt = compat_sock_common_getsockopt, 876 #endif 877 }; 878 879 /* 880 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 881 * udp_poll 882 */ 883 static const struct proto_ops inet_sockraw_ops = { 884 .family = PF_INET, 885 .owner = THIS_MODULE, 886 .release = inet_release, 887 .bind = inet_bind, 888 .connect = inet_dgram_connect, 889 .socketpair = sock_no_socketpair, 890 .accept = sock_no_accept, 891 .getname = inet_getname, 892 .poll = datagram_poll, 893 .ioctl = inet_ioctl, 894 .listen = sock_no_listen, 895 .shutdown = inet_shutdown, 896 .setsockopt = sock_common_setsockopt, 897 .getsockopt = sock_common_getsockopt, 898 .sendmsg = inet_sendmsg, 899 .recvmsg = sock_common_recvmsg, 900 .mmap = sock_no_mmap, 901 .sendpage = inet_sendpage, 902 #ifdef CONFIG_COMPAT 903 .compat_setsockopt = compat_sock_common_setsockopt, 904 .compat_getsockopt = compat_sock_common_getsockopt, 905 #endif 906 }; 907 908 static struct net_proto_family inet_family_ops = { 909 .family = PF_INET, 910 .create = inet_create, 911 .owner = THIS_MODULE, 912 }; 913 914 /* Upon startup we insert all the elements in inetsw_array[] into 915 * the linked list inetsw. 916 */ 917 static struct inet_protosw inetsw_array[] = 918 { 919 { 920 .type = SOCK_STREAM, 921 .protocol = IPPROTO_TCP, 922 .prot = &tcp_prot, 923 .ops = &inet_stream_ops, 924 .capability = -1, 925 .no_check = 0, 926 .flags = INET_PROTOSW_PERMANENT | 927 INET_PROTOSW_ICSK, 928 }, 929 930 { 931 .type = SOCK_DGRAM, 932 .protocol = IPPROTO_UDP, 933 .prot = &udp_prot, 934 .ops = &inet_dgram_ops, 935 .capability = -1, 936 .no_check = UDP_CSUM_DEFAULT, 937 .flags = INET_PROTOSW_PERMANENT, 938 }, 939 940 941 { 942 .type = SOCK_RAW, 943 .protocol = IPPROTO_IP, /* wild card */ 944 .prot = &raw_prot, 945 .ops = &inet_sockraw_ops, 946 .capability = CAP_NET_RAW, 947 .no_check = UDP_CSUM_DEFAULT, 948 .flags = INET_PROTOSW_REUSE, 949 } 950 }; 951 952 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) 953 954 void inet_register_protosw(struct inet_protosw *p) 955 { 956 struct list_head *lh; 957 struct inet_protosw *answer; 958 int protocol = p->protocol; 959 struct list_head *last_perm; 960 961 spin_lock_bh(&inetsw_lock); 962 963 if (p->type >= SOCK_MAX) 964 goto out_illegal; 965 966 /* If we are trying to override a permanent protocol, bail. */ 967 answer = NULL; 968 last_perm = &inetsw[p->type]; 969 list_for_each(lh, &inetsw[p->type]) { 970 answer = list_entry(lh, struct inet_protosw, list); 971 972 /* Check only the non-wild match. */ 973 if (INET_PROTOSW_PERMANENT & answer->flags) { 974 if (protocol == answer->protocol) 975 break; 976 last_perm = lh; 977 } 978 979 answer = NULL; 980 } 981 if (answer) 982 goto out_permanent; 983 984 /* Add the new entry after the last permanent entry if any, so that 985 * the new entry does not override a permanent entry when matched with 986 * a wild-card protocol. But it is allowed to override any existing 987 * non-permanent entry. This means that when we remove this entry, the 988 * system automatically returns to the old behavior. 989 */ 990 list_add_rcu(&p->list, last_perm); 991 out: 992 spin_unlock_bh(&inetsw_lock); 993 994 synchronize_net(); 995 996 return; 997 998 out_permanent: 999 printk(KERN_ERR "Attempt to override permanent protocol %d.\n", 1000 protocol); 1001 goto out; 1002 1003 out_illegal: 1004 printk(KERN_ERR 1005 "Ignoring attempt to register invalid socket type %d.\n", 1006 p->type); 1007 goto out; 1008 } 1009 1010 void inet_unregister_protosw(struct inet_protosw *p) 1011 { 1012 if (INET_PROTOSW_PERMANENT & p->flags) { 1013 printk(KERN_ERR 1014 "Attempt to unregister permanent protocol %d.\n", 1015 p->protocol); 1016 } else { 1017 spin_lock_bh(&inetsw_lock); 1018 list_del_rcu(&p->list); 1019 spin_unlock_bh(&inetsw_lock); 1020 1021 synchronize_net(); 1022 } 1023 } 1024 1025 /* 1026 * Shall we try to damage output packets if routing dev changes? 1027 */ 1028 1029 int sysctl_ip_dynaddr __read_mostly; 1030 1031 static int inet_sk_reselect_saddr(struct sock *sk) 1032 { 1033 struct inet_sock *inet = inet_sk(sk); 1034 int err; 1035 struct rtable *rt; 1036 __be32 old_saddr = inet->saddr; 1037 __be32 new_saddr; 1038 __be32 daddr = inet->daddr; 1039 1040 if (inet->opt && inet->opt->srr) 1041 daddr = inet->opt->faddr; 1042 1043 /* Query new route. */ 1044 err = ip_route_connect(&rt, daddr, 0, 1045 RT_CONN_FLAGS(sk), 1046 sk->sk_bound_dev_if, 1047 sk->sk_protocol, 1048 inet->sport, inet->dport, sk, 0); 1049 if (err) 1050 return err; 1051 1052 sk_setup_caps(sk, &rt->u.dst); 1053 1054 new_saddr = rt->rt_src; 1055 1056 if (new_saddr == old_saddr) 1057 return 0; 1058 1059 if (sysctl_ip_dynaddr > 1) { 1060 printk(KERN_INFO "%s(): shifting inet->" 1061 "saddr from %d.%d.%d.%d to %d.%d.%d.%d\n", 1062 __FUNCTION__, 1063 NIPQUAD(old_saddr), 1064 NIPQUAD(new_saddr)); 1065 } 1066 1067 inet->saddr = inet->rcv_saddr = new_saddr; 1068 1069 /* 1070 * XXX The only one ugly spot where we need to 1071 * XXX really change the sockets identity after 1072 * XXX it has entered the hashes. -DaveM 1073 * 1074 * Besides that, it does not check for connection 1075 * uniqueness. Wait for troubles. 1076 */ 1077 __sk_prot_rehash(sk); 1078 return 0; 1079 } 1080 1081 int inet_sk_rebuild_header(struct sock *sk) 1082 { 1083 struct inet_sock *inet = inet_sk(sk); 1084 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); 1085 __be32 daddr; 1086 int err; 1087 1088 /* Route is OK, nothing to do. */ 1089 if (rt) 1090 return 0; 1091 1092 /* Reroute. */ 1093 daddr = inet->daddr; 1094 if (inet->opt && inet->opt->srr) 1095 daddr = inet->opt->faddr; 1096 { 1097 struct flowi fl = { 1098 .oif = sk->sk_bound_dev_if, 1099 .nl_u = { 1100 .ip4_u = { 1101 .daddr = daddr, 1102 .saddr = inet->saddr, 1103 .tos = RT_CONN_FLAGS(sk), 1104 }, 1105 }, 1106 .proto = sk->sk_protocol, 1107 .uli_u = { 1108 .ports = { 1109 .sport = inet->sport, 1110 .dport = inet->dport, 1111 }, 1112 }, 1113 }; 1114 1115 security_sk_classify_flow(sk, &fl); 1116 err = ip_route_output_flow(&init_net, &rt, &fl, sk, 0); 1117 } 1118 if (!err) 1119 sk_setup_caps(sk, &rt->u.dst); 1120 else { 1121 /* Routing failed... */ 1122 sk->sk_route_caps = 0; 1123 /* 1124 * Other protocols have to map its equivalent state to TCP_SYN_SENT. 1125 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme 1126 */ 1127 if (!sysctl_ip_dynaddr || 1128 sk->sk_state != TCP_SYN_SENT || 1129 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 1130 (err = inet_sk_reselect_saddr(sk)) != 0) 1131 sk->sk_err_soft = -err; 1132 } 1133 1134 return err; 1135 } 1136 1137 EXPORT_SYMBOL(inet_sk_rebuild_header); 1138 1139 static int inet_gso_send_check(struct sk_buff *skb) 1140 { 1141 struct iphdr *iph; 1142 struct net_protocol *ops; 1143 int proto; 1144 int ihl; 1145 int err = -EINVAL; 1146 1147 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1148 goto out; 1149 1150 iph = ip_hdr(skb); 1151 ihl = iph->ihl * 4; 1152 if (ihl < sizeof(*iph)) 1153 goto out; 1154 1155 if (unlikely(!pskb_may_pull(skb, ihl))) 1156 goto out; 1157 1158 __skb_pull(skb, ihl); 1159 skb_reset_transport_header(skb); 1160 iph = ip_hdr(skb); 1161 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1162 err = -EPROTONOSUPPORT; 1163 1164 rcu_read_lock(); 1165 ops = rcu_dereference(inet_protos[proto]); 1166 if (likely(ops && ops->gso_send_check)) 1167 err = ops->gso_send_check(skb); 1168 rcu_read_unlock(); 1169 1170 out: 1171 return err; 1172 } 1173 1174 static struct sk_buff *inet_gso_segment(struct sk_buff *skb, int features) 1175 { 1176 struct sk_buff *segs = ERR_PTR(-EINVAL); 1177 struct iphdr *iph; 1178 struct net_protocol *ops; 1179 int proto; 1180 int ihl; 1181 int id; 1182 1183 if (!(features & NETIF_F_V4_CSUM)) 1184 features &= ~NETIF_F_SG; 1185 1186 if (unlikely(skb_shinfo(skb)->gso_type & 1187 ~(SKB_GSO_TCPV4 | 1188 SKB_GSO_UDP | 1189 SKB_GSO_DODGY | 1190 SKB_GSO_TCP_ECN | 1191 0))) 1192 goto out; 1193 1194 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1195 goto out; 1196 1197 iph = ip_hdr(skb); 1198 ihl = iph->ihl * 4; 1199 if (ihl < sizeof(*iph)) 1200 goto out; 1201 1202 if (unlikely(!pskb_may_pull(skb, ihl))) 1203 goto out; 1204 1205 __skb_pull(skb, ihl); 1206 skb_reset_transport_header(skb); 1207 iph = ip_hdr(skb); 1208 id = ntohs(iph->id); 1209 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1210 segs = ERR_PTR(-EPROTONOSUPPORT); 1211 1212 rcu_read_lock(); 1213 ops = rcu_dereference(inet_protos[proto]); 1214 if (likely(ops && ops->gso_segment)) 1215 segs = ops->gso_segment(skb, features); 1216 rcu_read_unlock(); 1217 1218 if (!segs || unlikely(IS_ERR(segs))) 1219 goto out; 1220 1221 skb = segs; 1222 do { 1223 iph = ip_hdr(skb); 1224 iph->id = htons(id++); 1225 iph->tot_len = htons(skb->len - skb->mac_len); 1226 iph->check = 0; 1227 iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl); 1228 } while ((skb = skb->next)); 1229 1230 out: 1231 return segs; 1232 } 1233 1234 unsigned long snmp_fold_field(void *mib[], int offt) 1235 { 1236 unsigned long res = 0; 1237 int i; 1238 1239 for_each_possible_cpu(i) { 1240 res += *(((unsigned long *) per_cpu_ptr(mib[0], i)) + offt); 1241 res += *(((unsigned long *) per_cpu_ptr(mib[1], i)) + offt); 1242 } 1243 return res; 1244 } 1245 EXPORT_SYMBOL_GPL(snmp_fold_field); 1246 1247 int snmp_mib_init(void *ptr[2], size_t mibsize) 1248 { 1249 BUG_ON(ptr == NULL); 1250 ptr[0] = __alloc_percpu(mibsize); 1251 if (!ptr[0]) 1252 goto err0; 1253 ptr[1] = __alloc_percpu(mibsize); 1254 if (!ptr[1]) 1255 goto err1; 1256 return 0; 1257 err1: 1258 free_percpu(ptr[0]); 1259 ptr[0] = NULL; 1260 err0: 1261 return -ENOMEM; 1262 } 1263 EXPORT_SYMBOL_GPL(snmp_mib_init); 1264 1265 void snmp_mib_free(void *ptr[2]) 1266 { 1267 BUG_ON(ptr == NULL); 1268 free_percpu(ptr[0]); 1269 free_percpu(ptr[1]); 1270 ptr[0] = ptr[1] = NULL; 1271 } 1272 EXPORT_SYMBOL_GPL(snmp_mib_free); 1273 1274 #ifdef CONFIG_IP_MULTICAST 1275 static struct net_protocol igmp_protocol = { 1276 .handler = igmp_rcv, 1277 }; 1278 #endif 1279 1280 static struct net_protocol tcp_protocol = { 1281 .handler = tcp_v4_rcv, 1282 .err_handler = tcp_v4_err, 1283 .gso_send_check = tcp_v4_gso_send_check, 1284 .gso_segment = tcp_tso_segment, 1285 .no_policy = 1, 1286 }; 1287 1288 static struct net_protocol udp_protocol = { 1289 .handler = udp_rcv, 1290 .err_handler = udp_err, 1291 .no_policy = 1, 1292 }; 1293 1294 static struct net_protocol icmp_protocol = { 1295 .handler = icmp_rcv, 1296 .no_policy = 1, 1297 }; 1298 1299 static int __init init_ipv4_mibs(void) 1300 { 1301 if (snmp_mib_init((void **)net_statistics, 1302 sizeof(struct linux_mib)) < 0) 1303 goto err_net_mib; 1304 if (snmp_mib_init((void **)ip_statistics, 1305 sizeof(struct ipstats_mib)) < 0) 1306 goto err_ip_mib; 1307 if (snmp_mib_init((void **)icmp_statistics, 1308 sizeof(struct icmp_mib)) < 0) 1309 goto err_icmp_mib; 1310 if (snmp_mib_init((void **)icmpmsg_statistics, 1311 sizeof(struct icmpmsg_mib)) < 0) 1312 goto err_icmpmsg_mib; 1313 if (snmp_mib_init((void **)tcp_statistics, 1314 sizeof(struct tcp_mib)) < 0) 1315 goto err_tcp_mib; 1316 if (snmp_mib_init((void **)udp_statistics, 1317 sizeof(struct udp_mib)) < 0) 1318 goto err_udp_mib; 1319 if (snmp_mib_init((void **)udplite_statistics, 1320 sizeof(struct udp_mib)) < 0) 1321 goto err_udplite_mib; 1322 1323 tcp_mib_init(); 1324 1325 return 0; 1326 1327 err_udplite_mib: 1328 snmp_mib_free((void **)udp_statistics); 1329 err_udp_mib: 1330 snmp_mib_free((void **)tcp_statistics); 1331 err_tcp_mib: 1332 snmp_mib_free((void **)icmpmsg_statistics); 1333 err_icmpmsg_mib: 1334 snmp_mib_free((void **)icmp_statistics); 1335 err_icmp_mib: 1336 snmp_mib_free((void **)ip_statistics); 1337 err_ip_mib: 1338 snmp_mib_free((void **)net_statistics); 1339 err_net_mib: 1340 return -ENOMEM; 1341 } 1342 1343 static int ipv4_proc_init(void); 1344 1345 /* 1346 * IP protocol layer initialiser 1347 */ 1348 1349 static struct packet_type ip_packet_type = { 1350 .type = __constant_htons(ETH_P_IP), 1351 .func = ip_rcv, 1352 .gso_send_check = inet_gso_send_check, 1353 .gso_segment = inet_gso_segment, 1354 }; 1355 1356 static int __init inet_init(void) 1357 { 1358 struct sk_buff *dummy_skb; 1359 struct inet_protosw *q; 1360 struct list_head *r; 1361 int rc = -EINVAL; 1362 1363 BUILD_BUG_ON(sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb)); 1364 1365 rc = proto_register(&tcp_prot, 1); 1366 if (rc) 1367 goto out; 1368 1369 rc = proto_register(&udp_prot, 1); 1370 if (rc) 1371 goto out_unregister_tcp_proto; 1372 1373 rc = proto_register(&raw_prot, 1); 1374 if (rc) 1375 goto out_unregister_udp_proto; 1376 1377 /* 1378 * Tell SOCKET that we are alive... 1379 */ 1380 1381 (void)sock_register(&inet_family_ops); 1382 1383 /* 1384 * Add all the base protocols. 1385 */ 1386 1387 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 1388 printk(KERN_CRIT "inet_init: Cannot add ICMP protocol\n"); 1389 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) 1390 printk(KERN_CRIT "inet_init: Cannot add UDP protocol\n"); 1391 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) 1392 printk(KERN_CRIT "inet_init: Cannot add TCP protocol\n"); 1393 #ifdef CONFIG_IP_MULTICAST 1394 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 1395 printk(KERN_CRIT "inet_init: Cannot add IGMP protocol\n"); 1396 #endif 1397 1398 /* Register the socket-side information for inet_create. */ 1399 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 1400 INIT_LIST_HEAD(r); 1401 1402 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 1403 inet_register_protosw(q); 1404 1405 /* 1406 * Set the ARP module up 1407 */ 1408 1409 arp_init(); 1410 1411 /* 1412 * Set the IP module up 1413 */ 1414 1415 ip_init(); 1416 1417 tcp_v4_init(&inet_family_ops); 1418 1419 /* Setup TCP slab cache for open requests. */ 1420 tcp_init(); 1421 1422 /* Setup UDP memory threshold */ 1423 udp_init(); 1424 1425 /* Add UDP-Lite (RFC 3828) */ 1426 udplite4_register(); 1427 1428 /* 1429 * Set the ICMP layer up 1430 */ 1431 1432 icmp_init(&inet_family_ops); 1433 1434 /* 1435 * Initialise the multicast router 1436 */ 1437 #if defined(CONFIG_IP_MROUTE) 1438 ip_mr_init(); 1439 #endif 1440 /* 1441 * Initialise per-cpu ipv4 mibs 1442 */ 1443 1444 if (init_ipv4_mibs()) 1445 printk(KERN_CRIT "inet_init: Cannot init ipv4 mibs\n"); ; 1446 1447 ipv4_proc_init(); 1448 1449 ipfrag_init(); 1450 1451 dev_add_pack(&ip_packet_type); 1452 1453 rc = 0; 1454 out: 1455 return rc; 1456 out_unregister_udp_proto: 1457 proto_unregister(&udp_prot); 1458 out_unregister_tcp_proto: 1459 proto_unregister(&tcp_prot); 1460 goto out; 1461 } 1462 1463 fs_initcall(inet_init); 1464 1465 /* ------------------------------------------------------------------------ */ 1466 1467 #ifdef CONFIG_PROC_FS 1468 static int __init ipv4_proc_init(void) 1469 { 1470 int rc = 0; 1471 1472 if (raw_proc_init()) 1473 goto out_raw; 1474 if (tcp4_proc_init()) 1475 goto out_tcp; 1476 if (udp4_proc_init()) 1477 goto out_udp; 1478 if (ip_misc_proc_init()) 1479 goto out_misc; 1480 out: 1481 return rc; 1482 out_misc: 1483 udp4_proc_exit(); 1484 out_udp: 1485 tcp4_proc_exit(); 1486 out_tcp: 1487 raw_proc_exit(); 1488 out_raw: 1489 rc = -ENOMEM; 1490 goto out; 1491 } 1492 1493 #else /* CONFIG_PROC_FS */ 1494 static int __init ipv4_proc_init(void) 1495 { 1496 return 0; 1497 } 1498 #endif /* CONFIG_PROC_FS */ 1499 1500 MODULE_ALIAS_NETPROTO(PF_INET); 1501 1502 EXPORT_SYMBOL(inet_accept); 1503 EXPORT_SYMBOL(inet_bind); 1504 EXPORT_SYMBOL(inet_dgram_connect); 1505 EXPORT_SYMBOL(inet_dgram_ops); 1506 EXPORT_SYMBOL(inet_getname); 1507 EXPORT_SYMBOL(inet_ioctl); 1508 EXPORT_SYMBOL(inet_listen); 1509 EXPORT_SYMBOL(inet_register_protosw); 1510 EXPORT_SYMBOL(inet_release); 1511 EXPORT_SYMBOL(inet_sendmsg); 1512 EXPORT_SYMBOL(inet_shutdown); 1513 EXPORT_SYMBOL(inet_sock_destruct); 1514 EXPORT_SYMBOL(inet_stream_connect); 1515 EXPORT_SYMBOL(inet_stream_ops); 1516 EXPORT_SYMBOL(inet_unregister_protosw); 1517 EXPORT_SYMBOL(net_statistics); 1518 EXPORT_SYMBOL(sysctl_ip_nonlocal_bind); 1519