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 BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc)); 152 BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc)); 153 BUG_TRAP(!sk->sk_wmem_queued); 154 BUG_TRAP(!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 list_head *p; 268 struct inet_protosw *answer; 269 struct inet_sock *inet; 270 struct proto *answer_prot; 271 unsigned char answer_flags; 272 char answer_no_check; 273 int try_loading_module = 0; 274 int err; 275 276 if (sock->type != SOCK_RAW && 277 sock->type != SOCK_DGRAM && 278 !inet_ehash_secret) 279 build_ehash_secret(); 280 281 sock->state = SS_UNCONNECTED; 282 283 /* Look for the requested type/protocol pair. */ 284 answer = NULL; 285 lookup_protocol: 286 err = -ESOCKTNOSUPPORT; 287 rcu_read_lock(); 288 list_for_each_rcu(p, &inetsw[sock->type]) { 289 answer = list_entry(p, struct inet_protosw, list); 290 291 /* Check the non-wild match. */ 292 if (protocol == answer->protocol) { 293 if (protocol != IPPROTO_IP) 294 break; 295 } else { 296 /* Check for the two wild cases. */ 297 if (IPPROTO_IP == protocol) { 298 protocol = answer->protocol; 299 break; 300 } 301 if (IPPROTO_IP == answer->protocol) 302 break; 303 } 304 err = -EPROTONOSUPPORT; 305 answer = NULL; 306 } 307 308 if (unlikely(answer == NULL)) { 309 if (try_loading_module < 2) { 310 rcu_read_unlock(); 311 /* 312 * Be more specific, e.g. net-pf-2-proto-132-type-1 313 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) 314 */ 315 if (++try_loading_module == 1) 316 request_module("net-pf-%d-proto-%d-type-%d", 317 PF_INET, protocol, sock->type); 318 /* 319 * Fall back to generic, e.g. net-pf-2-proto-132 320 * (net-pf-PF_INET-proto-IPPROTO_SCTP) 321 */ 322 else 323 request_module("net-pf-%d-proto-%d", 324 PF_INET, protocol); 325 goto lookup_protocol; 326 } else 327 goto out_rcu_unlock; 328 } 329 330 err = -EPERM; 331 if (answer->capability > 0 && !capable(answer->capability)) 332 goto out_rcu_unlock; 333 334 err = -EAFNOSUPPORT; 335 if (!inet_netns_ok(net, protocol)) 336 goto out_rcu_unlock; 337 338 sock->ops = answer->ops; 339 answer_prot = answer->prot; 340 answer_no_check = answer->no_check; 341 answer_flags = answer->flags; 342 rcu_read_unlock(); 343 344 BUG_TRAP(answer_prot->slab != NULL); 345 346 err = -ENOBUFS; 347 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot); 348 if (sk == NULL) 349 goto out; 350 351 err = 0; 352 sk->sk_no_check = answer_no_check; 353 if (INET_PROTOSW_REUSE & answer_flags) 354 sk->sk_reuse = 1; 355 356 inet = inet_sk(sk); 357 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 358 359 if (SOCK_RAW == sock->type) { 360 inet->num = protocol; 361 if (IPPROTO_RAW == protocol) 362 inet->hdrincl = 1; 363 } 364 365 if (ipv4_config.no_pmtu_disc) 366 inet->pmtudisc = IP_PMTUDISC_DONT; 367 else 368 inet->pmtudisc = IP_PMTUDISC_WANT; 369 370 inet->id = 0; 371 372 sock_init_data(sock, sk); 373 374 sk->sk_destruct = inet_sock_destruct; 375 sk->sk_family = PF_INET; 376 sk->sk_protocol = protocol; 377 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 378 379 inet->uc_ttl = -1; 380 inet->mc_loop = 1; 381 inet->mc_ttl = 1; 382 inet->mc_index = 0; 383 inet->mc_list = NULL; 384 385 sk_refcnt_debug_inc(sk); 386 387 if (inet->num) { 388 /* It assumes that any protocol which allows 389 * the user to assign a number at socket 390 * creation time automatically 391 * shares. 392 */ 393 inet->sport = htons(inet->num); 394 /* Add to protocol hash chains. */ 395 sk->sk_prot->hash(sk); 396 } 397 398 if (sk->sk_prot->init) { 399 err = sk->sk_prot->init(sk); 400 if (err) 401 sk_common_release(sk); 402 } 403 out: 404 return err; 405 out_rcu_unlock: 406 rcu_read_unlock(); 407 goto out; 408 } 409 410 411 /* 412 * The peer socket should always be NULL (or else). When we call this 413 * function we are destroying the object and from then on nobody 414 * should refer to it. 415 */ 416 int inet_release(struct socket *sock) 417 { 418 struct sock *sk = sock->sk; 419 420 if (sk) { 421 long timeout; 422 423 /* Applications forget to leave groups before exiting */ 424 ip_mc_drop_socket(sk); 425 426 /* If linger is set, we don't return until the close 427 * is complete. Otherwise we return immediately. The 428 * actually closing is done the same either way. 429 * 430 * If the close is due to the process exiting, we never 431 * linger.. 432 */ 433 timeout = 0; 434 if (sock_flag(sk, SOCK_LINGER) && 435 !(current->flags & PF_EXITING)) 436 timeout = sk->sk_lingertime; 437 sock->sk = NULL; 438 sk->sk_prot->close(sk, timeout); 439 } 440 return 0; 441 } 442 443 /* It is off by default, see below. */ 444 int sysctl_ip_nonlocal_bind __read_mostly; 445 446 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 447 { 448 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 449 struct sock *sk = sock->sk; 450 struct inet_sock *inet = inet_sk(sk); 451 unsigned short snum; 452 int chk_addr_ret; 453 int err; 454 455 /* If the socket has its own bind function then use it. (RAW) */ 456 if (sk->sk_prot->bind) { 457 err = sk->sk_prot->bind(sk, uaddr, addr_len); 458 goto out; 459 } 460 err = -EINVAL; 461 if (addr_len < sizeof(struct sockaddr_in)) 462 goto out; 463 464 chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr); 465 466 /* Not specified by any standard per-se, however it breaks too 467 * many applications when removed. It is unfortunate since 468 * allowing applications to make a non-local bind solves 469 * several problems with systems using dynamic addressing. 470 * (ie. your servers still start up even if your ISDN link 471 * is temporarily down) 472 */ 473 err = -EADDRNOTAVAIL; 474 if (!sysctl_ip_nonlocal_bind && 475 !inet->freebind && 476 addr->sin_addr.s_addr != htonl(INADDR_ANY) && 477 chk_addr_ret != RTN_LOCAL && 478 chk_addr_ret != RTN_MULTICAST && 479 chk_addr_ret != RTN_BROADCAST) 480 goto out; 481 482 snum = ntohs(addr->sin_port); 483 err = -EACCES; 484 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) 485 goto out; 486 487 /* We keep a pair of addresses. rcv_saddr is the one 488 * used by hash lookups, and saddr is used for transmit. 489 * 490 * In the BSD API these are the same except where it 491 * would be illegal to use them (multicast/broadcast) in 492 * which case the sending device address is used. 493 */ 494 lock_sock(sk); 495 496 /* Check these errors (active socket, double bind). */ 497 err = -EINVAL; 498 if (sk->sk_state != TCP_CLOSE || inet->num) 499 goto out_release_sock; 500 501 inet->rcv_saddr = inet->saddr = addr->sin_addr.s_addr; 502 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 503 inet->saddr = 0; /* Use device */ 504 505 /* Make sure we are allowed to bind here. */ 506 if (sk->sk_prot->get_port(sk, snum)) { 507 inet->saddr = inet->rcv_saddr = 0; 508 err = -EADDRINUSE; 509 goto out_release_sock; 510 } 511 512 if (inet->rcv_saddr) 513 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 514 if (snum) 515 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 516 inet->sport = htons(inet->num); 517 inet->daddr = 0; 518 inet->dport = 0; 519 sk_dst_reset(sk); 520 err = 0; 521 out_release_sock: 522 release_sock(sk); 523 out: 524 return err; 525 } 526 527 int inet_dgram_connect(struct socket *sock, struct sockaddr * uaddr, 528 int addr_len, int flags) 529 { 530 struct sock *sk = sock->sk; 531 532 if (uaddr->sa_family == AF_UNSPEC) 533 return sk->sk_prot->disconnect(sk, flags); 534 535 if (!inet_sk(sk)->num && inet_autobind(sk)) 536 return -EAGAIN; 537 return sk->sk_prot->connect(sk, (struct sockaddr *)uaddr, addr_len); 538 } 539 540 static long inet_wait_for_connect(struct sock *sk, long timeo) 541 { 542 DEFINE_WAIT(wait); 543 544 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 545 546 /* Basic assumption: if someone sets sk->sk_err, he _must_ 547 * change state of the socket from TCP_SYN_*. 548 * Connect() does not allow to get error notifications 549 * without closing the socket. 550 */ 551 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 552 release_sock(sk); 553 timeo = schedule_timeout(timeo); 554 lock_sock(sk); 555 if (signal_pending(current) || !timeo) 556 break; 557 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 558 } 559 finish_wait(sk->sk_sleep, &wait); 560 return timeo; 561 } 562 563 /* 564 * Connect to a remote host. There is regrettably still a little 565 * TCP 'magic' in here. 566 */ 567 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 568 int addr_len, int flags) 569 { 570 struct sock *sk = sock->sk; 571 int err; 572 long timeo; 573 574 lock_sock(sk); 575 576 if (uaddr->sa_family == AF_UNSPEC) { 577 err = sk->sk_prot->disconnect(sk, flags); 578 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 579 goto out; 580 } 581 582 switch (sock->state) { 583 default: 584 err = -EINVAL; 585 goto out; 586 case SS_CONNECTED: 587 err = -EISCONN; 588 goto out; 589 case SS_CONNECTING: 590 err = -EALREADY; 591 /* Fall out of switch with err, set for this state */ 592 break; 593 case SS_UNCONNECTED: 594 err = -EISCONN; 595 if (sk->sk_state != TCP_CLOSE) 596 goto out; 597 598 err = sk->sk_prot->connect(sk, uaddr, addr_len); 599 if (err < 0) 600 goto out; 601 602 sock->state = SS_CONNECTING; 603 604 /* Just entered SS_CONNECTING state; the only 605 * difference is that return value in non-blocking 606 * case is EINPROGRESS, rather than EALREADY. 607 */ 608 err = -EINPROGRESS; 609 break; 610 } 611 612 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 613 614 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 615 /* Error code is set above */ 616 if (!timeo || !inet_wait_for_connect(sk, timeo)) 617 goto out; 618 619 err = sock_intr_errno(timeo); 620 if (signal_pending(current)) 621 goto out; 622 } 623 624 /* Connection was closed by RST, timeout, ICMP error 625 * or another process disconnected us. 626 */ 627 if (sk->sk_state == TCP_CLOSE) 628 goto sock_error; 629 630 /* sk->sk_err may be not zero now, if RECVERR was ordered by user 631 * and error was received after socket entered established state. 632 * Hence, it is handled normally after connect() return successfully. 633 */ 634 635 sock->state = SS_CONNECTED; 636 err = 0; 637 out: 638 release_sock(sk); 639 return err; 640 641 sock_error: 642 err = sock_error(sk) ? : -ECONNABORTED; 643 sock->state = SS_UNCONNECTED; 644 if (sk->sk_prot->disconnect(sk, flags)) 645 sock->state = SS_DISCONNECTING; 646 goto out; 647 } 648 649 /* 650 * Accept a pending connection. The TCP layer now gives BSD semantics. 651 */ 652 653 int inet_accept(struct socket *sock, struct socket *newsock, int flags) 654 { 655 struct sock *sk1 = sock->sk; 656 int err = -EINVAL; 657 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err); 658 659 if (!sk2) 660 goto do_err; 661 662 lock_sock(sk2); 663 664 BUG_TRAP((1 << sk2->sk_state) & 665 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE)); 666 667 sock_graft(sk2, newsock); 668 669 newsock->state = SS_CONNECTED; 670 err = 0; 671 release_sock(sk2); 672 do_err: 673 return err; 674 } 675 676 677 /* 678 * This does both peername and sockname. 679 */ 680 int inet_getname(struct socket *sock, struct sockaddr *uaddr, 681 int *uaddr_len, int peer) 682 { 683 struct sock *sk = sock->sk; 684 struct inet_sock *inet = inet_sk(sk); 685 struct sockaddr_in *sin = (struct sockaddr_in *)uaddr; 686 687 sin->sin_family = AF_INET; 688 if (peer) { 689 if (!inet->dport || 690 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 691 peer == 1)) 692 return -ENOTCONN; 693 sin->sin_port = inet->dport; 694 sin->sin_addr.s_addr = inet->daddr; 695 } else { 696 __be32 addr = inet->rcv_saddr; 697 if (!addr) 698 addr = inet->saddr; 699 sin->sin_port = inet->sport; 700 sin->sin_addr.s_addr = addr; 701 } 702 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 703 *uaddr_len = sizeof(*sin); 704 return 0; 705 } 706 707 int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 708 size_t size) 709 { 710 struct sock *sk = sock->sk; 711 712 /* We may need to bind the socket. */ 713 if (!inet_sk(sk)->num && inet_autobind(sk)) 714 return -EAGAIN; 715 716 return sk->sk_prot->sendmsg(iocb, sk, msg, size); 717 } 718 719 720 static ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) 721 { 722 struct sock *sk = sock->sk; 723 724 /* We may need to bind the socket. */ 725 if (!inet_sk(sk)->num && inet_autobind(sk)) 726 return -EAGAIN; 727 728 if (sk->sk_prot->sendpage) 729 return sk->sk_prot->sendpage(sk, page, offset, size, flags); 730 return sock_no_sendpage(sock, page, offset, size, flags); 731 } 732 733 734 int inet_shutdown(struct socket *sock, int how) 735 { 736 struct sock *sk = sock->sk; 737 int err = 0; 738 739 /* This should really check to make sure 740 * the socket is a TCP socket. (WHY AC...) 741 */ 742 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and 743 1->2 bit 2 snds. 744 2->3 */ 745 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ 746 return -EINVAL; 747 748 lock_sock(sk); 749 if (sock->state == SS_CONNECTING) { 750 if ((1 << sk->sk_state) & 751 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) 752 sock->state = SS_DISCONNECTING; 753 else 754 sock->state = SS_CONNECTED; 755 } 756 757 switch (sk->sk_state) { 758 case TCP_CLOSE: 759 err = -ENOTCONN; 760 /* Hack to wake up other listeners, who can poll for 761 POLLHUP, even on eg. unconnected UDP sockets -- RR */ 762 default: 763 sk->sk_shutdown |= how; 764 if (sk->sk_prot->shutdown) 765 sk->sk_prot->shutdown(sk, how); 766 break; 767 768 /* Remaining two branches are temporary solution for missing 769 * close() in multithreaded environment. It is _not_ a good idea, 770 * but we have no choice until close() is repaired at VFS level. 771 */ 772 case TCP_LISTEN: 773 if (!(how & RCV_SHUTDOWN)) 774 break; 775 /* Fall through */ 776 case TCP_SYN_SENT: 777 err = sk->sk_prot->disconnect(sk, O_NONBLOCK); 778 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 779 break; 780 } 781 782 /* Wake up anyone sleeping in poll. */ 783 sk->sk_state_change(sk); 784 release_sock(sk); 785 return err; 786 } 787 788 /* 789 * ioctl() calls you can issue on an INET socket. Most of these are 790 * device configuration and stuff and very rarely used. Some ioctls 791 * pass on to the socket itself. 792 * 793 * NOTE: I like the idea of a module for the config stuff. ie ifconfig 794 * loads the devconfigure module does its configuring and unloads it. 795 * There's a good 20K of config code hanging around the kernel. 796 */ 797 798 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 799 { 800 struct sock *sk = sock->sk; 801 int err = 0; 802 struct net *net = sock_net(sk); 803 804 switch (cmd) { 805 case SIOCGSTAMP: 806 err = sock_get_timestamp(sk, (struct timeval __user *)arg); 807 break; 808 case SIOCGSTAMPNS: 809 err = sock_get_timestampns(sk, (struct timespec __user *)arg); 810 break; 811 case SIOCADDRT: 812 case SIOCDELRT: 813 case SIOCRTMSG: 814 err = ip_rt_ioctl(net, cmd, (void __user *)arg); 815 break; 816 case SIOCDARP: 817 case SIOCGARP: 818 case SIOCSARP: 819 err = arp_ioctl(net, cmd, (void __user *)arg); 820 break; 821 case SIOCGIFADDR: 822 case SIOCSIFADDR: 823 case SIOCGIFBRDADDR: 824 case SIOCSIFBRDADDR: 825 case SIOCGIFNETMASK: 826 case SIOCSIFNETMASK: 827 case SIOCGIFDSTADDR: 828 case SIOCSIFDSTADDR: 829 case SIOCSIFPFLAGS: 830 case SIOCGIFPFLAGS: 831 case SIOCSIFFLAGS: 832 err = devinet_ioctl(net, cmd, (void __user *)arg); 833 break; 834 default: 835 if (sk->sk_prot->ioctl) 836 err = sk->sk_prot->ioctl(sk, cmd, arg); 837 else 838 err = -ENOIOCTLCMD; 839 break; 840 } 841 return err; 842 } 843 844 const struct proto_ops inet_stream_ops = { 845 .family = PF_INET, 846 .owner = THIS_MODULE, 847 .release = inet_release, 848 .bind = inet_bind, 849 .connect = inet_stream_connect, 850 .socketpair = sock_no_socketpair, 851 .accept = inet_accept, 852 .getname = inet_getname, 853 .poll = tcp_poll, 854 .ioctl = inet_ioctl, 855 .listen = inet_listen, 856 .shutdown = inet_shutdown, 857 .setsockopt = sock_common_setsockopt, 858 .getsockopt = sock_common_getsockopt, 859 .sendmsg = tcp_sendmsg, 860 .recvmsg = sock_common_recvmsg, 861 .mmap = sock_no_mmap, 862 .sendpage = tcp_sendpage, 863 .splice_read = tcp_splice_read, 864 #ifdef CONFIG_COMPAT 865 .compat_setsockopt = compat_sock_common_setsockopt, 866 .compat_getsockopt = compat_sock_common_getsockopt, 867 #endif 868 }; 869 870 const struct proto_ops inet_dgram_ops = { 871 .family = PF_INET, 872 .owner = THIS_MODULE, 873 .release = inet_release, 874 .bind = inet_bind, 875 .connect = inet_dgram_connect, 876 .socketpair = sock_no_socketpair, 877 .accept = sock_no_accept, 878 .getname = inet_getname, 879 .poll = udp_poll, 880 .ioctl = inet_ioctl, 881 .listen = sock_no_listen, 882 .shutdown = inet_shutdown, 883 .setsockopt = sock_common_setsockopt, 884 .getsockopt = sock_common_getsockopt, 885 .sendmsg = inet_sendmsg, 886 .recvmsg = sock_common_recvmsg, 887 .mmap = sock_no_mmap, 888 .sendpage = inet_sendpage, 889 #ifdef CONFIG_COMPAT 890 .compat_setsockopt = compat_sock_common_setsockopt, 891 .compat_getsockopt = compat_sock_common_getsockopt, 892 #endif 893 }; 894 895 /* 896 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 897 * udp_poll 898 */ 899 static const struct proto_ops inet_sockraw_ops = { 900 .family = PF_INET, 901 .owner = THIS_MODULE, 902 .release = inet_release, 903 .bind = inet_bind, 904 .connect = inet_dgram_connect, 905 .socketpair = sock_no_socketpair, 906 .accept = sock_no_accept, 907 .getname = inet_getname, 908 .poll = datagram_poll, 909 .ioctl = inet_ioctl, 910 .listen = sock_no_listen, 911 .shutdown = inet_shutdown, 912 .setsockopt = sock_common_setsockopt, 913 .getsockopt = sock_common_getsockopt, 914 .sendmsg = inet_sendmsg, 915 .recvmsg = sock_common_recvmsg, 916 .mmap = sock_no_mmap, 917 .sendpage = inet_sendpage, 918 #ifdef CONFIG_COMPAT 919 .compat_setsockopt = compat_sock_common_setsockopt, 920 .compat_getsockopt = compat_sock_common_getsockopt, 921 #endif 922 }; 923 924 static struct net_proto_family inet_family_ops = { 925 .family = PF_INET, 926 .create = inet_create, 927 .owner = THIS_MODULE, 928 }; 929 930 /* Upon startup we insert all the elements in inetsw_array[] into 931 * the linked list inetsw. 932 */ 933 static struct inet_protosw inetsw_array[] = 934 { 935 { 936 .type = SOCK_STREAM, 937 .protocol = IPPROTO_TCP, 938 .prot = &tcp_prot, 939 .ops = &inet_stream_ops, 940 .capability = -1, 941 .no_check = 0, 942 .flags = INET_PROTOSW_PERMANENT | 943 INET_PROTOSW_ICSK, 944 }, 945 946 { 947 .type = SOCK_DGRAM, 948 .protocol = IPPROTO_UDP, 949 .prot = &udp_prot, 950 .ops = &inet_dgram_ops, 951 .capability = -1, 952 .no_check = UDP_CSUM_DEFAULT, 953 .flags = INET_PROTOSW_PERMANENT, 954 }, 955 956 957 { 958 .type = SOCK_RAW, 959 .protocol = IPPROTO_IP, /* wild card */ 960 .prot = &raw_prot, 961 .ops = &inet_sockraw_ops, 962 .capability = CAP_NET_RAW, 963 .no_check = UDP_CSUM_DEFAULT, 964 .flags = INET_PROTOSW_REUSE, 965 } 966 }; 967 968 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) 969 970 void inet_register_protosw(struct inet_protosw *p) 971 { 972 struct list_head *lh; 973 struct inet_protosw *answer; 974 int protocol = p->protocol; 975 struct list_head *last_perm; 976 977 spin_lock_bh(&inetsw_lock); 978 979 if (p->type >= SOCK_MAX) 980 goto out_illegal; 981 982 /* If we are trying to override a permanent protocol, bail. */ 983 answer = NULL; 984 last_perm = &inetsw[p->type]; 985 list_for_each(lh, &inetsw[p->type]) { 986 answer = list_entry(lh, struct inet_protosw, list); 987 988 /* Check only the non-wild match. */ 989 if (INET_PROTOSW_PERMANENT & answer->flags) { 990 if (protocol == answer->protocol) 991 break; 992 last_perm = lh; 993 } 994 995 answer = NULL; 996 } 997 if (answer) 998 goto out_permanent; 999 1000 /* Add the new entry after the last permanent entry if any, so that 1001 * the new entry does not override a permanent entry when matched with 1002 * a wild-card protocol. But it is allowed to override any existing 1003 * non-permanent entry. This means that when we remove this entry, the 1004 * system automatically returns to the old behavior. 1005 */ 1006 list_add_rcu(&p->list, last_perm); 1007 out: 1008 spin_unlock_bh(&inetsw_lock); 1009 1010 synchronize_net(); 1011 1012 return; 1013 1014 out_permanent: 1015 printk(KERN_ERR "Attempt to override permanent protocol %d.\n", 1016 protocol); 1017 goto out; 1018 1019 out_illegal: 1020 printk(KERN_ERR 1021 "Ignoring attempt to register invalid socket type %d.\n", 1022 p->type); 1023 goto out; 1024 } 1025 1026 void inet_unregister_protosw(struct inet_protosw *p) 1027 { 1028 if (INET_PROTOSW_PERMANENT & p->flags) { 1029 printk(KERN_ERR 1030 "Attempt to unregister permanent protocol %d.\n", 1031 p->protocol); 1032 } else { 1033 spin_lock_bh(&inetsw_lock); 1034 list_del_rcu(&p->list); 1035 spin_unlock_bh(&inetsw_lock); 1036 1037 synchronize_net(); 1038 } 1039 } 1040 1041 /* 1042 * Shall we try to damage output packets if routing dev changes? 1043 */ 1044 1045 int sysctl_ip_dynaddr __read_mostly; 1046 1047 static int inet_sk_reselect_saddr(struct sock *sk) 1048 { 1049 struct inet_sock *inet = inet_sk(sk); 1050 int err; 1051 struct rtable *rt; 1052 __be32 old_saddr = inet->saddr; 1053 __be32 new_saddr; 1054 __be32 daddr = inet->daddr; 1055 1056 if (inet->opt && inet->opt->srr) 1057 daddr = inet->opt->faddr; 1058 1059 /* Query new route. */ 1060 err = ip_route_connect(&rt, daddr, 0, 1061 RT_CONN_FLAGS(sk), 1062 sk->sk_bound_dev_if, 1063 sk->sk_protocol, 1064 inet->sport, inet->dport, sk, 0); 1065 if (err) 1066 return err; 1067 1068 sk_setup_caps(sk, &rt->u.dst); 1069 1070 new_saddr = rt->rt_src; 1071 1072 if (new_saddr == old_saddr) 1073 return 0; 1074 1075 if (sysctl_ip_dynaddr > 1) { 1076 printk(KERN_INFO "%s(): shifting inet->" 1077 "saddr from " NIPQUAD_FMT " to " NIPQUAD_FMT "\n", 1078 __func__, 1079 NIPQUAD(old_saddr), 1080 NIPQUAD(new_saddr)); 1081 } 1082 1083 inet->saddr = inet->rcv_saddr = new_saddr; 1084 1085 /* 1086 * XXX The only one ugly spot where we need to 1087 * XXX really change the sockets identity after 1088 * XXX it has entered the hashes. -DaveM 1089 * 1090 * Besides that, it does not check for connection 1091 * uniqueness. Wait for troubles. 1092 */ 1093 __sk_prot_rehash(sk); 1094 return 0; 1095 } 1096 1097 int inet_sk_rebuild_header(struct sock *sk) 1098 { 1099 struct inet_sock *inet = inet_sk(sk); 1100 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); 1101 __be32 daddr; 1102 int err; 1103 1104 /* Route is OK, nothing to do. */ 1105 if (rt) 1106 return 0; 1107 1108 /* Reroute. */ 1109 daddr = inet->daddr; 1110 if (inet->opt && inet->opt->srr) 1111 daddr = inet->opt->faddr; 1112 { 1113 struct flowi fl = { 1114 .oif = sk->sk_bound_dev_if, 1115 .nl_u = { 1116 .ip4_u = { 1117 .daddr = daddr, 1118 .saddr = inet->saddr, 1119 .tos = RT_CONN_FLAGS(sk), 1120 }, 1121 }, 1122 .proto = sk->sk_protocol, 1123 .uli_u = { 1124 .ports = { 1125 .sport = inet->sport, 1126 .dport = inet->dport, 1127 }, 1128 }, 1129 }; 1130 1131 security_sk_classify_flow(sk, &fl); 1132 err = ip_route_output_flow(sock_net(sk), &rt, &fl, sk, 0); 1133 } 1134 if (!err) 1135 sk_setup_caps(sk, &rt->u.dst); 1136 else { 1137 /* Routing failed... */ 1138 sk->sk_route_caps = 0; 1139 /* 1140 * Other protocols have to map its equivalent state to TCP_SYN_SENT. 1141 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme 1142 */ 1143 if (!sysctl_ip_dynaddr || 1144 sk->sk_state != TCP_SYN_SENT || 1145 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 1146 (err = inet_sk_reselect_saddr(sk)) != 0) 1147 sk->sk_err_soft = -err; 1148 } 1149 1150 return err; 1151 } 1152 1153 EXPORT_SYMBOL(inet_sk_rebuild_header); 1154 1155 static int inet_gso_send_check(struct sk_buff *skb) 1156 { 1157 struct iphdr *iph; 1158 struct net_protocol *ops; 1159 int proto; 1160 int ihl; 1161 int err = -EINVAL; 1162 1163 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1164 goto out; 1165 1166 iph = ip_hdr(skb); 1167 ihl = iph->ihl * 4; 1168 if (ihl < sizeof(*iph)) 1169 goto out; 1170 1171 if (unlikely(!pskb_may_pull(skb, ihl))) 1172 goto out; 1173 1174 __skb_pull(skb, ihl); 1175 skb_reset_transport_header(skb); 1176 iph = ip_hdr(skb); 1177 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1178 err = -EPROTONOSUPPORT; 1179 1180 rcu_read_lock(); 1181 ops = rcu_dereference(inet_protos[proto]); 1182 if (likely(ops && ops->gso_send_check)) 1183 err = ops->gso_send_check(skb); 1184 rcu_read_unlock(); 1185 1186 out: 1187 return err; 1188 } 1189 1190 static struct sk_buff *inet_gso_segment(struct sk_buff *skb, int features) 1191 { 1192 struct sk_buff *segs = ERR_PTR(-EINVAL); 1193 struct iphdr *iph; 1194 struct net_protocol *ops; 1195 int proto; 1196 int ihl; 1197 int id; 1198 1199 if (!(features & NETIF_F_V4_CSUM)) 1200 features &= ~NETIF_F_SG; 1201 1202 if (unlikely(skb_shinfo(skb)->gso_type & 1203 ~(SKB_GSO_TCPV4 | 1204 SKB_GSO_UDP | 1205 SKB_GSO_DODGY | 1206 SKB_GSO_TCP_ECN | 1207 0))) 1208 goto out; 1209 1210 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1211 goto out; 1212 1213 iph = ip_hdr(skb); 1214 ihl = iph->ihl * 4; 1215 if (ihl < sizeof(*iph)) 1216 goto out; 1217 1218 if (unlikely(!pskb_may_pull(skb, ihl))) 1219 goto out; 1220 1221 __skb_pull(skb, ihl); 1222 skb_reset_transport_header(skb); 1223 iph = ip_hdr(skb); 1224 id = ntohs(iph->id); 1225 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1226 segs = ERR_PTR(-EPROTONOSUPPORT); 1227 1228 rcu_read_lock(); 1229 ops = rcu_dereference(inet_protos[proto]); 1230 if (likely(ops && ops->gso_segment)) 1231 segs = ops->gso_segment(skb, features); 1232 rcu_read_unlock(); 1233 1234 if (!segs || IS_ERR(segs)) 1235 goto out; 1236 1237 skb = segs; 1238 do { 1239 iph = ip_hdr(skb); 1240 iph->id = htons(id++); 1241 iph->tot_len = htons(skb->len - skb->mac_len); 1242 iph->check = 0; 1243 iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl); 1244 } while ((skb = skb->next)); 1245 1246 out: 1247 return segs; 1248 } 1249 1250 int inet_ctl_sock_create(struct sock **sk, unsigned short family, 1251 unsigned short type, unsigned char protocol, 1252 struct net *net) 1253 { 1254 struct socket *sock; 1255 int rc = sock_create_kern(family, type, protocol, &sock); 1256 1257 if (rc == 0) { 1258 *sk = sock->sk; 1259 (*sk)->sk_allocation = GFP_ATOMIC; 1260 /* 1261 * Unhash it so that IP input processing does not even see it, 1262 * we do not wish this socket to see incoming packets. 1263 */ 1264 (*sk)->sk_prot->unhash(*sk); 1265 1266 sk_change_net(*sk, net); 1267 } 1268 return rc; 1269 } 1270 1271 EXPORT_SYMBOL_GPL(inet_ctl_sock_create); 1272 1273 unsigned long snmp_fold_field(void *mib[], int offt) 1274 { 1275 unsigned long res = 0; 1276 int i; 1277 1278 for_each_possible_cpu(i) { 1279 res += *(((unsigned long *) per_cpu_ptr(mib[0], i)) + offt); 1280 res += *(((unsigned long *) per_cpu_ptr(mib[1], i)) + offt); 1281 } 1282 return res; 1283 } 1284 EXPORT_SYMBOL_GPL(snmp_fold_field); 1285 1286 int snmp_mib_init(void *ptr[2], size_t mibsize) 1287 { 1288 BUG_ON(ptr == NULL); 1289 ptr[0] = __alloc_percpu(mibsize); 1290 if (!ptr[0]) 1291 goto err0; 1292 ptr[1] = __alloc_percpu(mibsize); 1293 if (!ptr[1]) 1294 goto err1; 1295 return 0; 1296 err1: 1297 free_percpu(ptr[0]); 1298 ptr[0] = NULL; 1299 err0: 1300 return -ENOMEM; 1301 } 1302 EXPORT_SYMBOL_GPL(snmp_mib_init); 1303 1304 void snmp_mib_free(void *ptr[2]) 1305 { 1306 BUG_ON(ptr == NULL); 1307 free_percpu(ptr[0]); 1308 free_percpu(ptr[1]); 1309 ptr[0] = ptr[1] = NULL; 1310 } 1311 EXPORT_SYMBOL_GPL(snmp_mib_free); 1312 1313 #ifdef CONFIG_IP_MULTICAST 1314 static struct net_protocol igmp_protocol = { 1315 .handler = igmp_rcv, 1316 }; 1317 #endif 1318 1319 static struct net_protocol tcp_protocol = { 1320 .handler = tcp_v4_rcv, 1321 .err_handler = tcp_v4_err, 1322 .gso_send_check = tcp_v4_gso_send_check, 1323 .gso_segment = tcp_tso_segment, 1324 .no_policy = 1, 1325 .netns_ok = 1, 1326 }; 1327 1328 static struct net_protocol udp_protocol = { 1329 .handler = udp_rcv, 1330 .err_handler = udp_err, 1331 .no_policy = 1, 1332 .netns_ok = 1, 1333 }; 1334 1335 static struct net_protocol icmp_protocol = { 1336 .handler = icmp_rcv, 1337 .no_policy = 1, 1338 .netns_ok = 1, 1339 }; 1340 1341 static __net_init int ipv4_mib_init_net(struct net *net) 1342 { 1343 if (snmp_mib_init((void **)net->mib.tcp_statistics, 1344 sizeof(struct tcp_mib)) < 0) 1345 goto err_tcp_mib; 1346 if (snmp_mib_init((void **)net->mib.ip_statistics, 1347 sizeof(struct ipstats_mib)) < 0) 1348 goto err_ip_mib; 1349 if (snmp_mib_init((void **)net->mib.net_statistics, 1350 sizeof(struct linux_mib)) < 0) 1351 goto err_net_mib; 1352 if (snmp_mib_init((void **)net->mib.udp_statistics, 1353 sizeof(struct udp_mib)) < 0) 1354 goto err_udp_mib; 1355 if (snmp_mib_init((void **)net->mib.udplite_statistics, 1356 sizeof(struct udp_mib)) < 0) 1357 goto err_udplite_mib; 1358 if (snmp_mib_init((void **)net->mib.icmp_statistics, 1359 sizeof(struct icmp_mib)) < 0) 1360 goto err_icmp_mib; 1361 if (snmp_mib_init((void **)net->mib.icmpmsg_statistics, 1362 sizeof(struct icmpmsg_mib)) < 0) 1363 goto err_icmpmsg_mib; 1364 1365 tcp_mib_init(net); 1366 return 0; 1367 1368 err_icmpmsg_mib: 1369 snmp_mib_free((void **)net->mib.icmp_statistics); 1370 err_icmp_mib: 1371 snmp_mib_free((void **)net->mib.udplite_statistics); 1372 err_udplite_mib: 1373 snmp_mib_free((void **)net->mib.udp_statistics); 1374 err_udp_mib: 1375 snmp_mib_free((void **)net->mib.net_statistics); 1376 err_net_mib: 1377 snmp_mib_free((void **)net->mib.ip_statistics); 1378 err_ip_mib: 1379 snmp_mib_free((void **)net->mib.tcp_statistics); 1380 err_tcp_mib: 1381 return -ENOMEM; 1382 } 1383 1384 static __net_exit void ipv4_mib_exit_net(struct net *net) 1385 { 1386 snmp_mib_free((void **)net->mib.icmpmsg_statistics); 1387 snmp_mib_free((void **)net->mib.icmp_statistics); 1388 snmp_mib_free((void **)net->mib.udplite_statistics); 1389 snmp_mib_free((void **)net->mib.udp_statistics); 1390 snmp_mib_free((void **)net->mib.net_statistics); 1391 snmp_mib_free((void **)net->mib.ip_statistics); 1392 snmp_mib_free((void **)net->mib.tcp_statistics); 1393 } 1394 1395 static __net_initdata struct pernet_operations ipv4_mib_ops = { 1396 .init = ipv4_mib_init_net, 1397 .exit = ipv4_mib_exit_net, 1398 }; 1399 1400 static int __init init_ipv4_mibs(void) 1401 { 1402 return register_pernet_subsys(&ipv4_mib_ops); 1403 } 1404 1405 static int ipv4_proc_init(void); 1406 1407 /* 1408 * IP protocol layer initialiser 1409 */ 1410 1411 static struct packet_type ip_packet_type = { 1412 .type = __constant_htons(ETH_P_IP), 1413 .func = ip_rcv, 1414 .gso_send_check = inet_gso_send_check, 1415 .gso_segment = inet_gso_segment, 1416 }; 1417 1418 static int __init inet_init(void) 1419 { 1420 struct sk_buff *dummy_skb; 1421 struct inet_protosw *q; 1422 struct list_head *r; 1423 int rc = -EINVAL; 1424 1425 BUILD_BUG_ON(sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb)); 1426 1427 rc = proto_register(&tcp_prot, 1); 1428 if (rc) 1429 goto out; 1430 1431 rc = proto_register(&udp_prot, 1); 1432 if (rc) 1433 goto out_unregister_tcp_proto; 1434 1435 rc = proto_register(&raw_prot, 1); 1436 if (rc) 1437 goto out_unregister_udp_proto; 1438 1439 /* 1440 * Tell SOCKET that we are alive... 1441 */ 1442 1443 (void)sock_register(&inet_family_ops); 1444 1445 /* 1446 * Add all the base protocols. 1447 */ 1448 1449 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 1450 printk(KERN_CRIT "inet_init: Cannot add ICMP protocol\n"); 1451 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) 1452 printk(KERN_CRIT "inet_init: Cannot add UDP protocol\n"); 1453 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) 1454 printk(KERN_CRIT "inet_init: Cannot add TCP protocol\n"); 1455 #ifdef CONFIG_IP_MULTICAST 1456 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 1457 printk(KERN_CRIT "inet_init: Cannot add IGMP protocol\n"); 1458 #endif 1459 1460 /* Register the socket-side information for inet_create. */ 1461 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 1462 INIT_LIST_HEAD(r); 1463 1464 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 1465 inet_register_protosw(q); 1466 1467 /* 1468 * Set the ARP module up 1469 */ 1470 1471 arp_init(); 1472 1473 /* 1474 * Set the IP module up 1475 */ 1476 1477 ip_init(); 1478 1479 tcp_v4_init(); 1480 1481 /* Setup TCP slab cache for open requests. */ 1482 tcp_init(); 1483 1484 /* Setup UDP memory threshold */ 1485 udp_init(); 1486 1487 /* Add UDP-Lite (RFC 3828) */ 1488 udplite4_register(); 1489 1490 /* 1491 * Set the ICMP layer up 1492 */ 1493 1494 if (icmp_init() < 0) 1495 panic("Failed to create the ICMP control socket.\n"); 1496 1497 /* 1498 * Initialise the multicast router 1499 */ 1500 #if defined(CONFIG_IP_MROUTE) 1501 if (ip_mr_init()) 1502 printk(KERN_CRIT "inet_init: Cannot init ipv4 mroute\n"); 1503 #endif 1504 /* 1505 * Initialise per-cpu ipv4 mibs 1506 */ 1507 1508 if (init_ipv4_mibs()) 1509 printk(KERN_CRIT "inet_init: Cannot init ipv4 mibs\n"); 1510 1511 ipv4_proc_init(); 1512 1513 ipfrag_init(); 1514 1515 dev_add_pack(&ip_packet_type); 1516 1517 rc = 0; 1518 out: 1519 return rc; 1520 out_unregister_udp_proto: 1521 proto_unregister(&udp_prot); 1522 out_unregister_tcp_proto: 1523 proto_unregister(&tcp_prot); 1524 goto out; 1525 } 1526 1527 fs_initcall(inet_init); 1528 1529 /* ------------------------------------------------------------------------ */ 1530 1531 #ifdef CONFIG_PROC_FS 1532 static int __init ipv4_proc_init(void) 1533 { 1534 int rc = 0; 1535 1536 if (raw_proc_init()) 1537 goto out_raw; 1538 if (tcp4_proc_init()) 1539 goto out_tcp; 1540 if (udp4_proc_init()) 1541 goto out_udp; 1542 if (ip_misc_proc_init()) 1543 goto out_misc; 1544 out: 1545 return rc; 1546 out_misc: 1547 udp4_proc_exit(); 1548 out_udp: 1549 tcp4_proc_exit(); 1550 out_tcp: 1551 raw_proc_exit(); 1552 out_raw: 1553 rc = -ENOMEM; 1554 goto out; 1555 } 1556 1557 #else /* CONFIG_PROC_FS */ 1558 static int __init ipv4_proc_init(void) 1559 { 1560 return 0; 1561 } 1562 #endif /* CONFIG_PROC_FS */ 1563 1564 MODULE_ALIAS_NETPROTO(PF_INET); 1565 1566 EXPORT_SYMBOL(inet_accept); 1567 EXPORT_SYMBOL(inet_bind); 1568 EXPORT_SYMBOL(inet_dgram_connect); 1569 EXPORT_SYMBOL(inet_dgram_ops); 1570 EXPORT_SYMBOL(inet_getname); 1571 EXPORT_SYMBOL(inet_ioctl); 1572 EXPORT_SYMBOL(inet_listen); 1573 EXPORT_SYMBOL(inet_register_protosw); 1574 EXPORT_SYMBOL(inet_release); 1575 EXPORT_SYMBOL(inet_sendmsg); 1576 EXPORT_SYMBOL(inet_shutdown); 1577 EXPORT_SYMBOL(inet_sock_destruct); 1578 EXPORT_SYMBOL(inet_stream_connect); 1579 EXPORT_SYMBOL(inet_stream_ops); 1580 EXPORT_SYMBOL(inet_unregister_protosw); 1581 EXPORT_SYMBOL(sysctl_ip_nonlocal_bind); 1582