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