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 * Authors: Ross Biro 9 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 10 * Florian La Roche, <flla@stud.uni-sb.de> 11 * Alan Cox, <A.Cox@swansea.ac.uk> 12 * 13 * Changes (see also sock.c) 14 * 15 * piggy, 16 * Karl Knutson : Socket protocol table 17 * A.N.Kuznetsov : Socket death error in accept(). 18 * John Richardson : Fix non blocking error in connect() 19 * so sockets that fail to connect 20 * don't return -EINPROGRESS. 21 * Alan Cox : Asynchronous I/O support 22 * Alan Cox : Keep correct socket pointer on sock 23 * structures 24 * when accept() ed 25 * Alan Cox : Semantics of SO_LINGER aren't state 26 * moved to close when you look carefully. 27 * With this fixed and the accept bug fixed 28 * some RPC stuff seems happier. 29 * Niibe Yutaka : 4.4BSD style write async I/O 30 * Alan Cox, 31 * Tony Gale : Fixed reuse semantics. 32 * Alan Cox : bind() shouldn't abort existing but dead 33 * sockets. Stops FTP netin:.. I hope. 34 * Alan Cox : bind() works correctly for RAW sockets. 35 * Note that FreeBSD at least was broken 36 * in this respect so be careful with 37 * compatibility tests... 38 * Alan Cox : routing cache support 39 * Alan Cox : memzero the socket structure for 40 * compactness. 41 * Matt Day : nonblock connect error handler 42 * Alan Cox : Allow large numbers of pending sockets 43 * (eg for big web sites), but only if 44 * specifically application requested. 45 * Alan Cox : New buffering throughout IP. Used 46 * dumbly. 47 * Alan Cox : New buffering now used smartly. 48 * Alan Cox : BSD rather than common sense 49 * interpretation of listen. 50 * Germano Caronni : Assorted small races. 51 * Alan Cox : sendmsg/recvmsg basic support. 52 * Alan Cox : Only sendmsg/recvmsg now supported. 53 * Alan Cox : Locked down bind (see security list). 54 * Alan Cox : Loosened bind a little. 55 * Mike McLagan : ADD/DEL DLCI Ioctls 56 * Willy Konynenberg : Transparent proxying support. 57 * David S. Miller : New socket lookup architecture. 58 * Some other random speedups. 59 * Cyrus Durgin : Cleaned up file for kmod hacks. 60 * Andi Kleen : Fix inet_stream_connect TCP race. 61 * 62 * This program is free software; you can redistribute it and/or 63 * modify it under the terms of the GNU General Public License 64 * as published by the Free Software Foundation; either version 65 * 2 of the License, or (at your option) any later version. 66 */ 67 68 #include <linux/err.h> 69 #include <linux/errno.h> 70 #include <linux/types.h> 71 #include <linux/socket.h> 72 #include <linux/in.h> 73 #include <linux/kernel.h> 74 #include <linux/module.h> 75 #include <linux/sched.h> 76 #include <linux/timer.h> 77 #include <linux/string.h> 78 #include <linux/sockios.h> 79 #include <linux/net.h> 80 #include <linux/capability.h> 81 #include <linux/fcntl.h> 82 #include <linux/mm.h> 83 #include <linux/interrupt.h> 84 #include <linux/stat.h> 85 #include <linux/init.h> 86 #include <linux/poll.h> 87 #include <linux/netfilter_ipv4.h> 88 #include <linux/random.h> 89 90 #include <asm/uaccess.h> 91 #include <asm/system.h> 92 93 #include <linux/inet.h> 94 #include <linux/igmp.h> 95 #include <linux/inetdevice.h> 96 #include <linux/netdevice.h> 97 #include <net/ip.h> 98 #include <net/protocol.h> 99 #include <net/arp.h> 100 #include <net/route.h> 101 #include <net/ip_fib.h> 102 #include <net/inet_connection_sock.h> 103 #include <net/tcp.h> 104 #include <net/udp.h> 105 #include <net/udplite.h> 106 #include <linux/skbuff.h> 107 #include <net/sock.h> 108 #include <net/raw.h> 109 #include <net/icmp.h> 110 #include <net/ipip.h> 111 #include <net/inet_common.h> 112 #include <net/xfrm.h> 113 #include <net/net_namespace.h> 114 #ifdef CONFIG_IP_MROUTE 115 #include <linux/mroute.h> 116 #endif 117 118 extern void ip_mc_drop_socket(struct sock *sk); 119 120 /* The inetsw table contains everything that inet_create needs to 121 * build a new socket. 122 */ 123 static struct list_head inetsw[SOCK_MAX]; 124 static DEFINE_SPINLOCK(inetsw_lock); 125 126 struct ipv4_config ipv4_config; 127 128 EXPORT_SYMBOL(ipv4_config); 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 sk_mem_reclaim(sk); 140 141 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) { 142 printk("Attempt to release TCP socket in state %d %p\n", 143 sk->sk_state, sk); 144 return; 145 } 146 if (!sock_flag(sk, SOCK_DEAD)) { 147 printk("Attempt to release alive inet socket %p\n", sk); 148 return; 149 } 150 151 WARN_ON(atomic_read(&sk->sk_rmem_alloc)); 152 WARN_ON(atomic_read(&sk->sk_wmem_alloc)); 153 WARN_ON(sk->sk_wmem_queued); 154 WARN_ON(sk->sk_forward_alloc); 155 156 kfree(inet->opt); 157 dst_release(sk->sk_dst_cache); 158 sk_refcnt_debug_dec(sk); 159 } 160 161 /* 162 * The routines beyond this point handle the behaviour of an AF_INET 163 * socket object. Mostly it punts to the subprotocols of IP to do 164 * the work. 165 */ 166 167 /* 168 * Automatically bind an unbound socket. 169 */ 170 171 static int inet_autobind(struct sock *sk) 172 { 173 struct inet_sock *inet; 174 /* We may need to bind the socket. */ 175 lock_sock(sk); 176 inet = inet_sk(sk); 177 if (!inet->num) { 178 if (sk->sk_prot->get_port(sk, 0)) { 179 release_sock(sk); 180 return -EAGAIN; 181 } 182 inet->sport = htons(inet->num); 183 } 184 release_sock(sk); 185 return 0; 186 } 187 188 /* 189 * Move a socket into listening state. 190 */ 191 int inet_listen(struct socket *sock, int backlog) 192 { 193 struct sock *sk = sock->sk; 194 unsigned char old_state; 195 int err; 196 197 lock_sock(sk); 198 199 err = -EINVAL; 200 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM) 201 goto out; 202 203 old_state = sk->sk_state; 204 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN))) 205 goto out; 206 207 /* Really, if the socket is already in listen state 208 * we can only allow the backlog to be adjusted. 209 */ 210 if (old_state != TCP_LISTEN) { 211 err = inet_csk_listen_start(sk, backlog); 212 if (err) 213 goto out; 214 } 215 sk->sk_max_ack_backlog = backlog; 216 err = 0; 217 218 out: 219 release_sock(sk); 220 return err; 221 } 222 223 u32 inet_ehash_secret __read_mostly; 224 EXPORT_SYMBOL(inet_ehash_secret); 225 226 /* 227 * inet_ehash_secret must be set exactly once 228 * Instead of using a dedicated spinlock, we (ab)use inetsw_lock 229 */ 230 void build_ehash_secret(void) 231 { 232 u32 rnd; 233 do { 234 get_random_bytes(&rnd, sizeof(rnd)); 235 } while (rnd == 0); 236 spin_lock_bh(&inetsw_lock); 237 if (!inet_ehash_secret) 238 inet_ehash_secret = rnd; 239 spin_unlock_bh(&inetsw_lock); 240 } 241 EXPORT_SYMBOL(build_ehash_secret); 242 243 static inline int inet_netns_ok(struct net *net, int protocol) 244 { 245 int hash; 246 struct net_protocol *ipprot; 247 248 if (net == &init_net) 249 return 1; 250 251 hash = protocol & (MAX_INET_PROTOS - 1); 252 ipprot = rcu_dereference(inet_protos[hash]); 253 254 if (ipprot == NULL) 255 /* raw IP is OK */ 256 return 1; 257 return ipprot->netns_ok; 258 } 259 260 /* 261 * Create an inet socket. 262 */ 263 264 static int inet_create(struct net *net, struct socket *sock, int protocol) 265 { 266 struct sock *sk; 267 struct inet_protosw *answer; 268 struct inet_sock *inet; 269 struct proto *answer_prot; 270 unsigned char answer_flags; 271 char answer_no_check; 272 int try_loading_module = 0; 273 int err; 274 275 if (sock->type != SOCK_RAW && 276 sock->type != SOCK_DGRAM && 277 !inet_ehash_secret) 278 build_ehash_secret(); 279 280 sock->state = SS_UNCONNECTED; 281 282 /* Look for the requested type/protocol pair. */ 283 lookup_protocol: 284 err = -ESOCKTNOSUPPORT; 285 rcu_read_lock(); 286 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) { 287 288 err = 0; 289 /* Check the non-wild match. */ 290 if (protocol == answer->protocol) { 291 if (protocol != IPPROTO_IP) 292 break; 293 } else { 294 /* Check for the two wild cases. */ 295 if (IPPROTO_IP == protocol) { 296 protocol = answer->protocol; 297 break; 298 } 299 if (IPPROTO_IP == answer->protocol) 300 break; 301 } 302 err = -EPROTONOSUPPORT; 303 } 304 305 if (unlikely(err)) { 306 if (try_loading_module < 2) { 307 rcu_read_unlock(); 308 /* 309 * Be more specific, e.g. net-pf-2-proto-132-type-1 310 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) 311 */ 312 if (++try_loading_module == 1) 313 request_module("net-pf-%d-proto-%d-type-%d", 314 PF_INET, protocol, sock->type); 315 /* 316 * Fall back to generic, e.g. net-pf-2-proto-132 317 * (net-pf-PF_INET-proto-IPPROTO_SCTP) 318 */ 319 else 320 request_module("net-pf-%d-proto-%d", 321 PF_INET, protocol); 322 goto lookup_protocol; 323 } else 324 goto out_rcu_unlock; 325 } 326 327 err = -EPERM; 328 if (answer->capability > 0 && !capable(answer->capability)) 329 goto out_rcu_unlock; 330 331 err = -EAFNOSUPPORT; 332 if (!inet_netns_ok(net, protocol)) 333 goto out_rcu_unlock; 334 335 sock->ops = answer->ops; 336 answer_prot = answer->prot; 337 answer_no_check = answer->no_check; 338 answer_flags = answer->flags; 339 rcu_read_unlock(); 340 341 WARN_ON(answer_prot->slab == NULL); 342 343 err = -ENOBUFS; 344 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot); 345 if (sk == NULL) 346 goto out; 347 348 err = 0; 349 sk->sk_no_check = answer_no_check; 350 if (INET_PROTOSW_REUSE & answer_flags) 351 sk->sk_reuse = 1; 352 353 inet = inet_sk(sk); 354 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 355 356 if (SOCK_RAW == sock->type) { 357 inet->num = protocol; 358 if (IPPROTO_RAW == protocol) 359 inet->hdrincl = 1; 360 } 361 362 if (ipv4_config.no_pmtu_disc) 363 inet->pmtudisc = IP_PMTUDISC_DONT; 364 else 365 inet->pmtudisc = IP_PMTUDISC_WANT; 366 367 inet->id = 0; 368 369 sock_init_data(sock, sk); 370 371 sk->sk_destruct = inet_sock_destruct; 372 sk->sk_family = PF_INET; 373 sk->sk_protocol = protocol; 374 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 375 376 inet->uc_ttl = -1; 377 inet->mc_loop = 1; 378 inet->mc_ttl = 1; 379 inet->mc_index = 0; 380 inet->mc_list = NULL; 381 382 sk_refcnt_debug_inc(sk); 383 384 if (inet->num) { 385 /* It assumes that any protocol which allows 386 * the user to assign a number at socket 387 * creation time automatically 388 * shares. 389 */ 390 inet->sport = htons(inet->num); 391 /* Add to protocol hash chains. */ 392 sk->sk_prot->hash(sk); 393 } 394 395 if (sk->sk_prot->init) { 396 err = sk->sk_prot->init(sk); 397 if (err) 398 sk_common_release(sk); 399 } 400 out: 401 return err; 402 out_rcu_unlock: 403 rcu_read_unlock(); 404 goto out; 405 } 406 407 408 /* 409 * The peer socket should always be NULL (or else). When we call this 410 * function we are destroying the object and from then on nobody 411 * should refer to it. 412 */ 413 int inet_release(struct socket *sock) 414 { 415 struct sock *sk = sock->sk; 416 417 if (sk) { 418 long timeout; 419 420 /* Applications forget to leave groups before exiting */ 421 ip_mc_drop_socket(sk); 422 423 /* If linger is set, we don't return until the close 424 * is complete. Otherwise we return immediately. The 425 * actually closing is done the same either way. 426 * 427 * If the close is due to the process exiting, we never 428 * linger.. 429 */ 430 timeout = 0; 431 if (sock_flag(sk, SOCK_LINGER) && 432 !(current->flags & PF_EXITING)) 433 timeout = sk->sk_lingertime; 434 sock->sk = NULL; 435 sk->sk_prot->close(sk, timeout); 436 } 437 return 0; 438 } 439 440 /* It is off by default, see below. */ 441 int sysctl_ip_nonlocal_bind __read_mostly; 442 443 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 444 { 445 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 446 struct sock *sk = sock->sk; 447 struct inet_sock *inet = inet_sk(sk); 448 unsigned short snum; 449 int chk_addr_ret; 450 int err; 451 452 /* If the socket has its own bind function then use it. (RAW) */ 453 if (sk->sk_prot->bind) { 454 err = sk->sk_prot->bind(sk, uaddr, addr_len); 455 goto out; 456 } 457 err = -EINVAL; 458 if (addr_len < sizeof(struct sockaddr_in)) 459 goto out; 460 461 chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr); 462 463 /* Not specified by any standard per-se, however it breaks too 464 * many applications when removed. It is unfortunate since 465 * allowing applications to make a non-local bind solves 466 * several problems with systems using dynamic addressing. 467 * (ie. your servers still start up even if your ISDN link 468 * is temporarily down) 469 */ 470 err = -EADDRNOTAVAIL; 471 if (!sysctl_ip_nonlocal_bind && 472 !(inet->freebind || inet->transparent) && 473 addr->sin_addr.s_addr != htonl(INADDR_ANY) && 474 chk_addr_ret != RTN_LOCAL && 475 chk_addr_ret != RTN_MULTICAST && 476 chk_addr_ret != RTN_BROADCAST) 477 goto out; 478 479 snum = ntohs(addr->sin_port); 480 err = -EACCES; 481 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) 482 goto out; 483 484 /* We keep a pair of addresses. rcv_saddr is the one 485 * used by hash lookups, and saddr is used for transmit. 486 * 487 * In the BSD API these are the same except where it 488 * would be illegal to use them (multicast/broadcast) in 489 * which case the sending device address is used. 490 */ 491 lock_sock(sk); 492 493 /* Check these errors (active socket, double bind). */ 494 err = -EINVAL; 495 if (sk->sk_state != TCP_CLOSE || inet->num) 496 goto out_release_sock; 497 498 inet->rcv_saddr = inet->saddr = addr->sin_addr.s_addr; 499 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 500 inet->saddr = 0; /* Use device */ 501 502 /* Make sure we are allowed to bind here. */ 503 if (sk->sk_prot->get_port(sk, snum)) { 504 inet->saddr = inet->rcv_saddr = 0; 505 err = -EADDRINUSE; 506 goto out_release_sock; 507 } 508 509 if (inet->rcv_saddr) 510 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 511 if (snum) 512 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 513 inet->sport = htons(inet->num); 514 inet->daddr = 0; 515 inet->dport = 0; 516 sk_dst_reset(sk); 517 err = 0; 518 out_release_sock: 519 release_sock(sk); 520 out: 521 return err; 522 } 523 524 int inet_dgram_connect(struct socket *sock, struct sockaddr * uaddr, 525 int addr_len, int flags) 526 { 527 struct sock *sk = sock->sk; 528 529 if (uaddr->sa_family == AF_UNSPEC) 530 return sk->sk_prot->disconnect(sk, flags); 531 532 if (!inet_sk(sk)->num && inet_autobind(sk)) 533 return -EAGAIN; 534 return sk->sk_prot->connect(sk, (struct sockaddr *)uaddr, addr_len); 535 } 536 537 static long inet_wait_for_connect(struct sock *sk, long timeo) 538 { 539 DEFINE_WAIT(wait); 540 541 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 542 543 /* Basic assumption: if someone sets sk->sk_err, he _must_ 544 * change state of the socket from TCP_SYN_*. 545 * Connect() does not allow to get error notifications 546 * without closing the socket. 547 */ 548 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 549 release_sock(sk); 550 timeo = schedule_timeout(timeo); 551 lock_sock(sk); 552 if (signal_pending(current) || !timeo) 553 break; 554 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 555 } 556 finish_wait(sk->sk_sleep, &wait); 557 return timeo; 558 } 559 560 /* 561 * Connect to a remote host. There is regrettably still a little 562 * TCP 'magic' in here. 563 */ 564 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 565 int addr_len, int flags) 566 { 567 struct sock *sk = sock->sk; 568 int err; 569 long timeo; 570 571 lock_sock(sk); 572 573 if (uaddr->sa_family == AF_UNSPEC) { 574 err = sk->sk_prot->disconnect(sk, flags); 575 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 576 goto out; 577 } 578 579 switch (sock->state) { 580 default: 581 err = -EINVAL; 582 goto out; 583 case SS_CONNECTED: 584 err = -EISCONN; 585 goto out; 586 case SS_CONNECTING: 587 err = -EALREADY; 588 /* Fall out of switch with err, set for this state */ 589 break; 590 case SS_UNCONNECTED: 591 err = -EISCONN; 592 if (sk->sk_state != TCP_CLOSE) 593 goto out; 594 595 err = sk->sk_prot->connect(sk, uaddr, addr_len); 596 if (err < 0) 597 goto out; 598 599 sock->state = SS_CONNECTING; 600 601 /* Just entered SS_CONNECTING state; the only 602 * difference is that return value in non-blocking 603 * case is EINPROGRESS, rather than EALREADY. 604 */ 605 err = -EINPROGRESS; 606 break; 607 } 608 609 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 610 611 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 612 /* Error code is set above */ 613 if (!timeo || !inet_wait_for_connect(sk, timeo)) 614 goto out; 615 616 err = sock_intr_errno(timeo); 617 if (signal_pending(current)) 618 goto out; 619 } 620 621 /* Connection was closed by RST, timeout, ICMP error 622 * or another process disconnected us. 623 */ 624 if (sk->sk_state == TCP_CLOSE) 625 goto sock_error; 626 627 /* sk->sk_err may be not zero now, if RECVERR was ordered by user 628 * and error was received after socket entered established state. 629 * Hence, it is handled normally after connect() return successfully. 630 */ 631 632 sock->state = SS_CONNECTED; 633 err = 0; 634 out: 635 release_sock(sk); 636 return err; 637 638 sock_error: 639 err = sock_error(sk) ? : -ECONNABORTED; 640 sock->state = SS_UNCONNECTED; 641 if (sk->sk_prot->disconnect(sk, flags)) 642 sock->state = SS_DISCONNECTING; 643 goto out; 644 } 645 646 /* 647 * Accept a pending connection. The TCP layer now gives BSD semantics. 648 */ 649 650 int inet_accept(struct socket *sock, struct socket *newsock, int flags) 651 { 652 struct sock *sk1 = sock->sk; 653 int err = -EINVAL; 654 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err); 655 656 if (!sk2) 657 goto do_err; 658 659 lock_sock(sk2); 660 661 WARN_ON(!((1 << sk2->sk_state) & 662 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE))); 663 664 sock_graft(sk2, newsock); 665 666 newsock->state = SS_CONNECTED; 667 err = 0; 668 release_sock(sk2); 669 do_err: 670 return err; 671 } 672 673 674 /* 675 * This does both peername and sockname. 676 */ 677 int inet_getname(struct socket *sock, struct sockaddr *uaddr, 678 int *uaddr_len, int peer) 679 { 680 struct sock *sk = sock->sk; 681 struct inet_sock *inet = inet_sk(sk); 682 struct sockaddr_in *sin = (struct sockaddr_in *)uaddr; 683 684 sin->sin_family = AF_INET; 685 if (peer) { 686 if (!inet->dport || 687 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 688 peer == 1)) 689 return -ENOTCONN; 690 sin->sin_port = inet->dport; 691 sin->sin_addr.s_addr = inet->daddr; 692 } else { 693 __be32 addr = inet->rcv_saddr; 694 if (!addr) 695 addr = inet->saddr; 696 sin->sin_port = inet->sport; 697 sin->sin_addr.s_addr = addr; 698 } 699 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 700 *uaddr_len = sizeof(*sin); 701 return 0; 702 } 703 704 int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 705 size_t size) 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 return sk->sk_prot->sendmsg(iocb, sk, msg, size); 714 } 715 716 717 static ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) 718 { 719 struct sock *sk = sock->sk; 720 721 /* We may need to bind the socket. */ 722 if (!inet_sk(sk)->num && inet_autobind(sk)) 723 return -EAGAIN; 724 725 if (sk->sk_prot->sendpage) 726 return sk->sk_prot->sendpage(sk, page, offset, size, flags); 727 return sock_no_sendpage(sock, page, offset, size, flags); 728 } 729 730 731 int inet_shutdown(struct socket *sock, int how) 732 { 733 struct sock *sk = sock->sk; 734 int err = 0; 735 736 /* This should really check to make sure 737 * the socket is a TCP socket. (WHY AC...) 738 */ 739 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and 740 1->2 bit 2 snds. 741 2->3 */ 742 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ 743 return -EINVAL; 744 745 lock_sock(sk); 746 if (sock->state == SS_CONNECTING) { 747 if ((1 << sk->sk_state) & 748 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) 749 sock->state = SS_DISCONNECTING; 750 else 751 sock->state = SS_CONNECTED; 752 } 753 754 switch (sk->sk_state) { 755 case TCP_CLOSE: 756 err = -ENOTCONN; 757 /* Hack to wake up other listeners, who can poll for 758 POLLHUP, even on eg. unconnected UDP sockets -- RR */ 759 default: 760 sk->sk_shutdown |= how; 761 if (sk->sk_prot->shutdown) 762 sk->sk_prot->shutdown(sk, how); 763 break; 764 765 /* Remaining two branches are temporary solution for missing 766 * close() in multithreaded environment. It is _not_ a good idea, 767 * but we have no choice until close() is repaired at VFS level. 768 */ 769 case TCP_LISTEN: 770 if (!(how & RCV_SHUTDOWN)) 771 break; 772 /* Fall through */ 773 case TCP_SYN_SENT: 774 err = sk->sk_prot->disconnect(sk, O_NONBLOCK); 775 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 776 break; 777 } 778 779 /* Wake up anyone sleeping in poll. */ 780 sk->sk_state_change(sk); 781 release_sock(sk); 782 return err; 783 } 784 785 /* 786 * ioctl() calls you can issue on an INET socket. Most of these are 787 * device configuration and stuff and very rarely used. Some ioctls 788 * pass on to the socket itself. 789 * 790 * NOTE: I like the idea of a module for the config stuff. ie ifconfig 791 * loads the devconfigure module does its configuring and unloads it. 792 * There's a good 20K of config code hanging around the kernel. 793 */ 794 795 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 796 { 797 struct sock *sk = sock->sk; 798 int err = 0; 799 struct net *net = sock_net(sk); 800 801 switch (cmd) { 802 case SIOCGSTAMP: 803 err = sock_get_timestamp(sk, (struct timeval __user *)arg); 804 break; 805 case SIOCGSTAMPNS: 806 err = sock_get_timestampns(sk, (struct timespec __user *)arg); 807 break; 808 case SIOCADDRT: 809 case SIOCDELRT: 810 case SIOCRTMSG: 811 err = ip_rt_ioctl(net, cmd, (void __user *)arg); 812 break; 813 case SIOCDARP: 814 case SIOCGARP: 815 case SIOCSARP: 816 err = arp_ioctl(net, cmd, (void __user *)arg); 817 break; 818 case SIOCGIFADDR: 819 case SIOCSIFADDR: 820 case SIOCGIFBRDADDR: 821 case SIOCSIFBRDADDR: 822 case SIOCGIFNETMASK: 823 case SIOCSIFNETMASK: 824 case SIOCGIFDSTADDR: 825 case SIOCSIFDSTADDR: 826 case SIOCSIFPFLAGS: 827 case SIOCGIFPFLAGS: 828 case SIOCSIFFLAGS: 829 err = devinet_ioctl(net, cmd, (void __user *)arg); 830 break; 831 default: 832 if (sk->sk_prot->ioctl) 833 err = sk->sk_prot->ioctl(sk, cmd, arg); 834 else 835 err = -ENOIOCTLCMD; 836 break; 837 } 838 return err; 839 } 840 841 const struct proto_ops inet_stream_ops = { 842 .family = PF_INET, 843 .owner = THIS_MODULE, 844 .release = inet_release, 845 .bind = inet_bind, 846 .connect = inet_stream_connect, 847 .socketpair = sock_no_socketpair, 848 .accept = inet_accept, 849 .getname = inet_getname, 850 .poll = tcp_poll, 851 .ioctl = inet_ioctl, 852 .listen = inet_listen, 853 .shutdown = inet_shutdown, 854 .setsockopt = sock_common_setsockopt, 855 .getsockopt = sock_common_getsockopt, 856 .sendmsg = tcp_sendmsg, 857 .recvmsg = sock_common_recvmsg, 858 .mmap = sock_no_mmap, 859 .sendpage = tcp_sendpage, 860 .splice_read = tcp_splice_read, 861 #ifdef CONFIG_COMPAT 862 .compat_setsockopt = compat_sock_common_setsockopt, 863 .compat_getsockopt = compat_sock_common_getsockopt, 864 #endif 865 }; 866 867 const struct proto_ops inet_dgram_ops = { 868 .family = PF_INET, 869 .owner = THIS_MODULE, 870 .release = inet_release, 871 .bind = inet_bind, 872 .connect = inet_dgram_connect, 873 .socketpair = sock_no_socketpair, 874 .accept = sock_no_accept, 875 .getname = inet_getname, 876 .poll = udp_poll, 877 .ioctl = inet_ioctl, 878 .listen = sock_no_listen, 879 .shutdown = inet_shutdown, 880 .setsockopt = sock_common_setsockopt, 881 .getsockopt = sock_common_getsockopt, 882 .sendmsg = inet_sendmsg, 883 .recvmsg = sock_common_recvmsg, 884 .mmap = sock_no_mmap, 885 .sendpage = inet_sendpage, 886 #ifdef CONFIG_COMPAT 887 .compat_setsockopt = compat_sock_common_setsockopt, 888 .compat_getsockopt = compat_sock_common_getsockopt, 889 #endif 890 }; 891 892 /* 893 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 894 * udp_poll 895 */ 896 static const struct proto_ops inet_sockraw_ops = { 897 .family = PF_INET, 898 .owner = THIS_MODULE, 899 .release = inet_release, 900 .bind = inet_bind, 901 .connect = inet_dgram_connect, 902 .socketpair = sock_no_socketpair, 903 .accept = sock_no_accept, 904 .getname = inet_getname, 905 .poll = datagram_poll, 906 .ioctl = inet_ioctl, 907 .listen = sock_no_listen, 908 .shutdown = inet_shutdown, 909 .setsockopt = sock_common_setsockopt, 910 .getsockopt = sock_common_getsockopt, 911 .sendmsg = inet_sendmsg, 912 .recvmsg = sock_common_recvmsg, 913 .mmap = sock_no_mmap, 914 .sendpage = inet_sendpage, 915 #ifdef CONFIG_COMPAT 916 .compat_setsockopt = compat_sock_common_setsockopt, 917 .compat_getsockopt = compat_sock_common_getsockopt, 918 #endif 919 }; 920 921 static struct net_proto_family inet_family_ops = { 922 .family = PF_INET, 923 .create = inet_create, 924 .owner = THIS_MODULE, 925 }; 926 927 /* Upon startup we insert all the elements in inetsw_array[] into 928 * the linked list inetsw. 929 */ 930 static struct inet_protosw inetsw_array[] = 931 { 932 { 933 .type = SOCK_STREAM, 934 .protocol = IPPROTO_TCP, 935 .prot = &tcp_prot, 936 .ops = &inet_stream_ops, 937 .capability = -1, 938 .no_check = 0, 939 .flags = INET_PROTOSW_PERMANENT | 940 INET_PROTOSW_ICSK, 941 }, 942 943 { 944 .type = SOCK_DGRAM, 945 .protocol = IPPROTO_UDP, 946 .prot = &udp_prot, 947 .ops = &inet_dgram_ops, 948 .capability = -1, 949 .no_check = UDP_CSUM_DEFAULT, 950 .flags = INET_PROTOSW_PERMANENT, 951 }, 952 953 954 { 955 .type = SOCK_RAW, 956 .protocol = IPPROTO_IP, /* wild card */ 957 .prot = &raw_prot, 958 .ops = &inet_sockraw_ops, 959 .capability = CAP_NET_RAW, 960 .no_check = UDP_CSUM_DEFAULT, 961 .flags = INET_PROTOSW_REUSE, 962 } 963 }; 964 965 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) 966 967 void inet_register_protosw(struct inet_protosw *p) 968 { 969 struct list_head *lh; 970 struct inet_protosw *answer; 971 int protocol = p->protocol; 972 struct list_head *last_perm; 973 974 spin_lock_bh(&inetsw_lock); 975 976 if (p->type >= SOCK_MAX) 977 goto out_illegal; 978 979 /* If we are trying to override a permanent protocol, bail. */ 980 answer = NULL; 981 last_perm = &inetsw[p->type]; 982 list_for_each(lh, &inetsw[p->type]) { 983 answer = list_entry(lh, struct inet_protosw, list); 984 985 /* Check only the non-wild match. */ 986 if (INET_PROTOSW_PERMANENT & answer->flags) { 987 if (protocol == answer->protocol) 988 break; 989 last_perm = lh; 990 } 991 992 answer = NULL; 993 } 994 if (answer) 995 goto out_permanent; 996 997 /* Add the new entry after the last permanent entry if any, so that 998 * the new entry does not override a permanent entry when matched with 999 * a wild-card protocol. But it is allowed to override any existing 1000 * non-permanent entry. This means that when we remove this entry, the 1001 * system automatically returns to the old behavior. 1002 */ 1003 list_add_rcu(&p->list, last_perm); 1004 out: 1005 spin_unlock_bh(&inetsw_lock); 1006 1007 synchronize_net(); 1008 1009 return; 1010 1011 out_permanent: 1012 printk(KERN_ERR "Attempt to override permanent protocol %d.\n", 1013 protocol); 1014 goto out; 1015 1016 out_illegal: 1017 printk(KERN_ERR 1018 "Ignoring attempt to register invalid socket type %d.\n", 1019 p->type); 1020 goto out; 1021 } 1022 1023 void inet_unregister_protosw(struct inet_protosw *p) 1024 { 1025 if (INET_PROTOSW_PERMANENT & p->flags) { 1026 printk(KERN_ERR 1027 "Attempt to unregister permanent protocol %d.\n", 1028 p->protocol); 1029 } else { 1030 spin_lock_bh(&inetsw_lock); 1031 list_del_rcu(&p->list); 1032 spin_unlock_bh(&inetsw_lock); 1033 1034 synchronize_net(); 1035 } 1036 } 1037 1038 /* 1039 * Shall we try to damage output packets if routing dev changes? 1040 */ 1041 1042 int sysctl_ip_dynaddr __read_mostly; 1043 1044 static int inet_sk_reselect_saddr(struct sock *sk) 1045 { 1046 struct inet_sock *inet = inet_sk(sk); 1047 int err; 1048 struct rtable *rt; 1049 __be32 old_saddr = inet->saddr; 1050 __be32 new_saddr; 1051 __be32 daddr = inet->daddr; 1052 1053 if (inet->opt && inet->opt->srr) 1054 daddr = inet->opt->faddr; 1055 1056 /* Query new route. */ 1057 err = ip_route_connect(&rt, daddr, 0, 1058 RT_CONN_FLAGS(sk), 1059 sk->sk_bound_dev_if, 1060 sk->sk_protocol, 1061 inet->sport, inet->dport, sk, 0); 1062 if (err) 1063 return err; 1064 1065 sk_setup_caps(sk, &rt->u.dst); 1066 1067 new_saddr = rt->rt_src; 1068 1069 if (new_saddr == old_saddr) 1070 return 0; 1071 1072 if (sysctl_ip_dynaddr > 1) { 1073 printk(KERN_INFO "%s(): shifting inet->" 1074 "saddr from " NIPQUAD_FMT " to " NIPQUAD_FMT "\n", 1075 __func__, 1076 NIPQUAD(old_saddr), 1077 NIPQUAD(new_saddr)); 1078 } 1079 1080 inet->saddr = inet->rcv_saddr = new_saddr; 1081 1082 /* 1083 * XXX The only one ugly spot where we need to 1084 * XXX really change the sockets identity after 1085 * XXX it has entered the hashes. -DaveM 1086 * 1087 * Besides that, it does not check for connection 1088 * uniqueness. Wait for troubles. 1089 */ 1090 __sk_prot_rehash(sk); 1091 return 0; 1092 } 1093 1094 int inet_sk_rebuild_header(struct sock *sk) 1095 { 1096 struct inet_sock *inet = inet_sk(sk); 1097 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); 1098 __be32 daddr; 1099 int err; 1100 1101 /* Route is OK, nothing to do. */ 1102 if (rt) 1103 return 0; 1104 1105 /* Reroute. */ 1106 daddr = inet->daddr; 1107 if (inet->opt && inet->opt->srr) 1108 daddr = inet->opt->faddr; 1109 { 1110 struct flowi fl = { 1111 .oif = sk->sk_bound_dev_if, 1112 .nl_u = { 1113 .ip4_u = { 1114 .daddr = daddr, 1115 .saddr = inet->saddr, 1116 .tos = RT_CONN_FLAGS(sk), 1117 }, 1118 }, 1119 .proto = sk->sk_protocol, 1120 .uli_u = { 1121 .ports = { 1122 .sport = inet->sport, 1123 .dport = inet->dport, 1124 }, 1125 }, 1126 }; 1127 1128 security_sk_classify_flow(sk, &fl); 1129 err = ip_route_output_flow(sock_net(sk), &rt, &fl, sk, 0); 1130 } 1131 if (!err) 1132 sk_setup_caps(sk, &rt->u.dst); 1133 else { 1134 /* Routing failed... */ 1135 sk->sk_route_caps = 0; 1136 /* 1137 * Other protocols have to map its equivalent state to TCP_SYN_SENT. 1138 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme 1139 */ 1140 if (!sysctl_ip_dynaddr || 1141 sk->sk_state != TCP_SYN_SENT || 1142 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 1143 (err = inet_sk_reselect_saddr(sk)) != 0) 1144 sk->sk_err_soft = -err; 1145 } 1146 1147 return err; 1148 } 1149 1150 EXPORT_SYMBOL(inet_sk_rebuild_header); 1151 1152 static int inet_gso_send_check(struct sk_buff *skb) 1153 { 1154 struct iphdr *iph; 1155 struct net_protocol *ops; 1156 int proto; 1157 int ihl; 1158 int err = -EINVAL; 1159 1160 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1161 goto out; 1162 1163 iph = ip_hdr(skb); 1164 ihl = iph->ihl * 4; 1165 if (ihl < sizeof(*iph)) 1166 goto out; 1167 1168 if (unlikely(!pskb_may_pull(skb, ihl))) 1169 goto out; 1170 1171 __skb_pull(skb, ihl); 1172 skb_reset_transport_header(skb); 1173 iph = ip_hdr(skb); 1174 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1175 err = -EPROTONOSUPPORT; 1176 1177 rcu_read_lock(); 1178 ops = rcu_dereference(inet_protos[proto]); 1179 if (likely(ops && ops->gso_send_check)) 1180 err = ops->gso_send_check(skb); 1181 rcu_read_unlock(); 1182 1183 out: 1184 return err; 1185 } 1186 1187 static struct sk_buff *inet_gso_segment(struct sk_buff *skb, int features) 1188 { 1189 struct sk_buff *segs = ERR_PTR(-EINVAL); 1190 struct iphdr *iph; 1191 struct net_protocol *ops; 1192 int proto; 1193 int ihl; 1194 int id; 1195 1196 if (!(features & NETIF_F_V4_CSUM)) 1197 features &= ~NETIF_F_SG; 1198 1199 if (unlikely(skb_shinfo(skb)->gso_type & 1200 ~(SKB_GSO_TCPV4 | 1201 SKB_GSO_UDP | 1202 SKB_GSO_DODGY | 1203 SKB_GSO_TCP_ECN | 1204 0))) 1205 goto out; 1206 1207 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1208 goto out; 1209 1210 iph = ip_hdr(skb); 1211 ihl = iph->ihl * 4; 1212 if (ihl < sizeof(*iph)) 1213 goto out; 1214 1215 if (unlikely(!pskb_may_pull(skb, ihl))) 1216 goto out; 1217 1218 __skb_pull(skb, ihl); 1219 skb_reset_transport_header(skb); 1220 iph = ip_hdr(skb); 1221 id = ntohs(iph->id); 1222 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1223 segs = ERR_PTR(-EPROTONOSUPPORT); 1224 1225 rcu_read_lock(); 1226 ops = rcu_dereference(inet_protos[proto]); 1227 if (likely(ops && ops->gso_segment)) 1228 segs = ops->gso_segment(skb, features); 1229 rcu_read_unlock(); 1230 1231 if (!segs || IS_ERR(segs)) 1232 goto out; 1233 1234 skb = segs; 1235 do { 1236 iph = ip_hdr(skb); 1237 iph->id = htons(id++); 1238 iph->tot_len = htons(skb->len - skb->mac_len); 1239 iph->check = 0; 1240 iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl); 1241 } while ((skb = skb->next)); 1242 1243 out: 1244 return segs; 1245 } 1246 1247 int inet_ctl_sock_create(struct sock **sk, unsigned short family, 1248 unsigned short type, unsigned char protocol, 1249 struct net *net) 1250 { 1251 struct socket *sock; 1252 int rc = sock_create_kern(family, type, protocol, &sock); 1253 1254 if (rc == 0) { 1255 *sk = sock->sk; 1256 (*sk)->sk_allocation = GFP_ATOMIC; 1257 /* 1258 * Unhash it so that IP input processing does not even see it, 1259 * we do not wish this socket to see incoming packets. 1260 */ 1261 (*sk)->sk_prot->unhash(*sk); 1262 1263 sk_change_net(*sk, net); 1264 } 1265 return rc; 1266 } 1267 1268 EXPORT_SYMBOL_GPL(inet_ctl_sock_create); 1269 1270 unsigned long snmp_fold_field(void *mib[], int offt) 1271 { 1272 unsigned long res = 0; 1273 int i; 1274 1275 for_each_possible_cpu(i) { 1276 res += *(((unsigned long *) per_cpu_ptr(mib[0], i)) + offt); 1277 res += *(((unsigned long *) per_cpu_ptr(mib[1], i)) + offt); 1278 } 1279 return res; 1280 } 1281 EXPORT_SYMBOL_GPL(snmp_fold_field); 1282 1283 int snmp_mib_init(void *ptr[2], size_t mibsize) 1284 { 1285 BUG_ON(ptr == NULL); 1286 ptr[0] = __alloc_percpu(mibsize); 1287 if (!ptr[0]) 1288 goto err0; 1289 ptr[1] = __alloc_percpu(mibsize); 1290 if (!ptr[1]) 1291 goto err1; 1292 return 0; 1293 err1: 1294 free_percpu(ptr[0]); 1295 ptr[0] = NULL; 1296 err0: 1297 return -ENOMEM; 1298 } 1299 EXPORT_SYMBOL_GPL(snmp_mib_init); 1300 1301 void snmp_mib_free(void *ptr[2]) 1302 { 1303 BUG_ON(ptr == NULL); 1304 free_percpu(ptr[0]); 1305 free_percpu(ptr[1]); 1306 ptr[0] = ptr[1] = NULL; 1307 } 1308 EXPORT_SYMBOL_GPL(snmp_mib_free); 1309 1310 #ifdef CONFIG_IP_MULTICAST 1311 static struct net_protocol igmp_protocol = { 1312 .handler = igmp_rcv, 1313 }; 1314 #endif 1315 1316 static struct net_protocol tcp_protocol = { 1317 .handler = tcp_v4_rcv, 1318 .err_handler = tcp_v4_err, 1319 .gso_send_check = tcp_v4_gso_send_check, 1320 .gso_segment = tcp_tso_segment, 1321 .no_policy = 1, 1322 .netns_ok = 1, 1323 }; 1324 1325 static struct net_protocol udp_protocol = { 1326 .handler = udp_rcv, 1327 .err_handler = udp_err, 1328 .no_policy = 1, 1329 .netns_ok = 1, 1330 }; 1331 1332 static struct net_protocol icmp_protocol = { 1333 .handler = icmp_rcv, 1334 .no_policy = 1, 1335 .netns_ok = 1, 1336 }; 1337 1338 static __net_init int ipv4_mib_init_net(struct net *net) 1339 { 1340 if (snmp_mib_init((void **)net->mib.tcp_statistics, 1341 sizeof(struct tcp_mib)) < 0) 1342 goto err_tcp_mib; 1343 if (snmp_mib_init((void **)net->mib.ip_statistics, 1344 sizeof(struct ipstats_mib)) < 0) 1345 goto err_ip_mib; 1346 if (snmp_mib_init((void **)net->mib.net_statistics, 1347 sizeof(struct linux_mib)) < 0) 1348 goto err_net_mib; 1349 if (snmp_mib_init((void **)net->mib.udp_statistics, 1350 sizeof(struct udp_mib)) < 0) 1351 goto err_udp_mib; 1352 if (snmp_mib_init((void **)net->mib.udplite_statistics, 1353 sizeof(struct udp_mib)) < 0) 1354 goto err_udplite_mib; 1355 if (snmp_mib_init((void **)net->mib.icmp_statistics, 1356 sizeof(struct icmp_mib)) < 0) 1357 goto err_icmp_mib; 1358 if (snmp_mib_init((void **)net->mib.icmpmsg_statistics, 1359 sizeof(struct icmpmsg_mib)) < 0) 1360 goto err_icmpmsg_mib; 1361 1362 tcp_mib_init(net); 1363 return 0; 1364 1365 err_icmpmsg_mib: 1366 snmp_mib_free((void **)net->mib.icmp_statistics); 1367 err_icmp_mib: 1368 snmp_mib_free((void **)net->mib.udplite_statistics); 1369 err_udplite_mib: 1370 snmp_mib_free((void **)net->mib.udp_statistics); 1371 err_udp_mib: 1372 snmp_mib_free((void **)net->mib.net_statistics); 1373 err_net_mib: 1374 snmp_mib_free((void **)net->mib.ip_statistics); 1375 err_ip_mib: 1376 snmp_mib_free((void **)net->mib.tcp_statistics); 1377 err_tcp_mib: 1378 return -ENOMEM; 1379 } 1380 1381 static __net_exit void ipv4_mib_exit_net(struct net *net) 1382 { 1383 snmp_mib_free((void **)net->mib.icmpmsg_statistics); 1384 snmp_mib_free((void **)net->mib.icmp_statistics); 1385 snmp_mib_free((void **)net->mib.udplite_statistics); 1386 snmp_mib_free((void **)net->mib.udp_statistics); 1387 snmp_mib_free((void **)net->mib.net_statistics); 1388 snmp_mib_free((void **)net->mib.ip_statistics); 1389 snmp_mib_free((void **)net->mib.tcp_statistics); 1390 } 1391 1392 static __net_initdata struct pernet_operations ipv4_mib_ops = { 1393 .init = ipv4_mib_init_net, 1394 .exit = ipv4_mib_exit_net, 1395 }; 1396 1397 static int __init init_ipv4_mibs(void) 1398 { 1399 return register_pernet_subsys(&ipv4_mib_ops); 1400 } 1401 1402 static int ipv4_proc_init(void); 1403 1404 /* 1405 * IP protocol layer initialiser 1406 */ 1407 1408 static struct packet_type ip_packet_type = { 1409 .type = __constant_htons(ETH_P_IP), 1410 .func = ip_rcv, 1411 .gso_send_check = inet_gso_send_check, 1412 .gso_segment = inet_gso_segment, 1413 }; 1414 1415 static int __init inet_init(void) 1416 { 1417 struct sk_buff *dummy_skb; 1418 struct inet_protosw *q; 1419 struct list_head *r; 1420 int rc = -EINVAL; 1421 1422 BUILD_BUG_ON(sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb)); 1423 1424 rc = proto_register(&tcp_prot, 1); 1425 if (rc) 1426 goto out; 1427 1428 rc = proto_register(&udp_prot, 1); 1429 if (rc) 1430 goto out_unregister_tcp_proto; 1431 1432 rc = proto_register(&raw_prot, 1); 1433 if (rc) 1434 goto out_unregister_udp_proto; 1435 1436 /* 1437 * Tell SOCKET that we are alive... 1438 */ 1439 1440 (void)sock_register(&inet_family_ops); 1441 1442 #ifdef CONFIG_SYSCTL 1443 ip_static_sysctl_init(); 1444 #endif 1445 1446 /* 1447 * Add all the base protocols. 1448 */ 1449 1450 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 1451 printk(KERN_CRIT "inet_init: Cannot add ICMP protocol\n"); 1452 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) 1453 printk(KERN_CRIT "inet_init: Cannot add UDP protocol\n"); 1454 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) 1455 printk(KERN_CRIT "inet_init: Cannot add TCP protocol\n"); 1456 #ifdef CONFIG_IP_MULTICAST 1457 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 1458 printk(KERN_CRIT "inet_init: Cannot add IGMP protocol\n"); 1459 #endif 1460 1461 /* Register the socket-side information for inet_create. */ 1462 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 1463 INIT_LIST_HEAD(r); 1464 1465 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 1466 inet_register_protosw(q); 1467 1468 /* 1469 * Set the ARP module up 1470 */ 1471 1472 arp_init(); 1473 1474 /* 1475 * Set the IP module up 1476 */ 1477 1478 ip_init(); 1479 1480 tcp_v4_init(); 1481 1482 /* Setup TCP slab cache for open requests. */ 1483 tcp_init(); 1484 1485 /* Setup UDP memory threshold */ 1486 udp_init(); 1487 1488 /* Add UDP-Lite (RFC 3828) */ 1489 udplite4_register(); 1490 1491 /* 1492 * Set the ICMP layer up 1493 */ 1494 1495 if (icmp_init() < 0) 1496 panic("Failed to create the ICMP control socket.\n"); 1497 1498 /* 1499 * Initialise the multicast router 1500 */ 1501 #if defined(CONFIG_IP_MROUTE) 1502 if (ip_mr_init()) 1503 printk(KERN_CRIT "inet_init: Cannot init ipv4 mroute\n"); 1504 #endif 1505 /* 1506 * Initialise per-cpu ipv4 mibs 1507 */ 1508 1509 if (init_ipv4_mibs()) 1510 printk(KERN_CRIT "inet_init: Cannot init ipv4 mibs\n"); 1511 1512 ipv4_proc_init(); 1513 1514 ipfrag_init(); 1515 1516 dev_add_pack(&ip_packet_type); 1517 1518 rc = 0; 1519 out: 1520 return rc; 1521 out_unregister_udp_proto: 1522 proto_unregister(&udp_prot); 1523 out_unregister_tcp_proto: 1524 proto_unregister(&tcp_prot); 1525 goto out; 1526 } 1527 1528 fs_initcall(inet_init); 1529 1530 /* ------------------------------------------------------------------------ */ 1531 1532 #ifdef CONFIG_PROC_FS 1533 static int __init ipv4_proc_init(void) 1534 { 1535 int rc = 0; 1536 1537 if (raw_proc_init()) 1538 goto out_raw; 1539 if (tcp4_proc_init()) 1540 goto out_tcp; 1541 if (udp4_proc_init()) 1542 goto out_udp; 1543 if (ip_misc_proc_init()) 1544 goto out_misc; 1545 out: 1546 return rc; 1547 out_misc: 1548 udp4_proc_exit(); 1549 out_udp: 1550 tcp4_proc_exit(); 1551 out_tcp: 1552 raw_proc_exit(); 1553 out_raw: 1554 rc = -ENOMEM; 1555 goto out; 1556 } 1557 1558 #else /* CONFIG_PROC_FS */ 1559 static int __init ipv4_proc_init(void) 1560 { 1561 return 0; 1562 } 1563 #endif /* CONFIG_PROC_FS */ 1564 1565 MODULE_ALIAS_NETPROTO(PF_INET); 1566 1567 EXPORT_SYMBOL(inet_accept); 1568 EXPORT_SYMBOL(inet_bind); 1569 EXPORT_SYMBOL(inet_dgram_connect); 1570 EXPORT_SYMBOL(inet_dgram_ops); 1571 EXPORT_SYMBOL(inet_getname); 1572 EXPORT_SYMBOL(inet_ioctl); 1573 EXPORT_SYMBOL(inet_listen); 1574 EXPORT_SYMBOL(inet_register_protosw); 1575 EXPORT_SYMBOL(inet_release); 1576 EXPORT_SYMBOL(inet_sendmsg); 1577 EXPORT_SYMBOL(inet_shutdown); 1578 EXPORT_SYMBOL(inet_sock_destruct); 1579 EXPORT_SYMBOL(inet_stream_connect); 1580 EXPORT_SYMBOL(inet_stream_ops); 1581 EXPORT_SYMBOL(inet_unregister_protosw); 1582 EXPORT_SYMBOL(sysctl_ip_nonlocal_bind); 1583