af_inet.c revision 13f18aa05f5abe135f47b6417537ae2b2fedc18c
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/checksum.h> 98#include <net/ip.h> 99#include <net/protocol.h> 100#include <net/arp.h> 101#include <net/route.h> 102#include <net/ip_fib.h> 103#include <net/inet_connection_sock.h> 104#include <net/tcp.h> 105#include <net/udp.h> 106#include <net/udplite.h> 107#include <linux/skbuff.h> 108#include <net/sock.h> 109#include <net/raw.h> 110#include <net/icmp.h> 111#include <net/ipip.h> 112#include <net/inet_common.h> 113#include <net/xfrm.h> 114#include <net/net_namespace.h> 115#ifdef CONFIG_IP_MROUTE 116#include <linux/mroute.h> 117#endif 118 119 120/* The inetsw table contains everything that inet_create needs to 121 * build a new socket. 122 */ 123static struct list_head inetsw[SOCK_MAX]; 124static DEFINE_SPINLOCK(inetsw_lock); 125 126struct ipv4_config ipv4_config; 127EXPORT_SYMBOL(ipv4_config); 128 129/* New destruction routine */ 130 131void 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 sk_mem_reclaim(sk); 139 140 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) { 141 pr_err("Attempt to release TCP socket in state %d %p\n", 142 sk->sk_state, sk); 143 return; 144 } 145 if (!sock_flag(sk, SOCK_DEAD)) { 146 pr_err("Attempt to release alive inet socket %p\n", sk); 147 return; 148 } 149 150 WARN_ON(atomic_read(&sk->sk_rmem_alloc)); 151 WARN_ON(atomic_read(&sk->sk_wmem_alloc)); 152 WARN_ON(sk->sk_wmem_queued); 153 WARN_ON(sk->sk_forward_alloc); 154 155 kfree(inet->opt); 156 dst_release(sk->sk_dst_cache); 157 sk_refcnt_debug_dec(sk); 158} 159EXPORT_SYMBOL(inet_sock_destruct); 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 171static 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->inet_num) { 178 if (sk->sk_prot->get_port(sk, 0)) { 179 release_sock(sk); 180 return -EAGAIN; 181 } 182 inet->inet_sport = htons(inet->inet_num); 183 } 184 release_sock(sk); 185 return 0; 186} 187 188/* 189 * Move a socket into listening state. 190 */ 191int 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 218out: 219 release_sock(sk); 220 return err; 221} 222EXPORT_SYMBOL(inet_listen); 223 224u32 inet_ehash_secret __read_mostly; 225EXPORT_SYMBOL(inet_ehash_secret); 226 227/* 228 * inet_ehash_secret must be set exactly once 229 * Instead of using a dedicated spinlock, we (ab)use inetsw_lock 230 */ 231void build_ehash_secret(void) 232{ 233 u32 rnd; 234 do { 235 get_random_bytes(&rnd, sizeof(rnd)); 236 } while (rnd == 0); 237 spin_lock_bh(&inetsw_lock); 238 if (!inet_ehash_secret) 239 inet_ehash_secret = rnd; 240 spin_unlock_bh(&inetsw_lock); 241} 242EXPORT_SYMBOL(build_ehash_secret); 243 244static inline int inet_netns_ok(struct net *net, int protocol) 245{ 246 int hash; 247 const struct net_protocol *ipprot; 248 249 if (net_eq(net, &init_net)) 250 return 1; 251 252 hash = protocol & (MAX_INET_PROTOS - 1); 253 ipprot = rcu_dereference(inet_protos[hash]); 254 255 if (ipprot == NULL) 256 /* raw IP is OK */ 257 return 1; 258 return ipprot->netns_ok; 259} 260 261/* 262 * Create an inet socket. 263 */ 264 265static int inet_create(struct net *net, struct socket *sock, int protocol) 266{ 267 struct sock *sk; 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 (unlikely(!inet_ehash_secret)) 277 if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM) 278 build_ehash_secret(); 279 280 sock->state = SS_UNCONNECTED; 281 282 /* Look for the requested type/protocol pair. */ 283lookup_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 (sock->type == SOCK_RAW && !capable(CAP_NET_RAW)) 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->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->inet_id = 0; 368 369 sock_init_data(sock, sk); 370 371 sk->sk_destruct = inet_sock_destruct; 372 sk->sk_protocol = protocol; 373 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 374 375 inet->uc_ttl = -1; 376 inet->mc_loop = 1; 377 inet->mc_ttl = 1; 378 inet->mc_all = 1; 379 inet->mc_index = 0; 380 inet->mc_list = NULL; 381 382 sk_refcnt_debug_inc(sk); 383 384 if (inet->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->inet_sport = htons(inet->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 } 400out: 401 return err; 402out_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 */ 413int 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} 439EXPORT_SYMBOL(inet_release); 440 441/* It is off by default, see below. */ 442int sysctl_ip_nonlocal_bind __read_mostly; 443EXPORT_SYMBOL(sysctl_ip_nonlocal_bind); 444 445int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 446{ 447 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 448 struct sock *sk = sock->sk; 449 struct inet_sock *inet = inet_sk(sk); 450 unsigned short snum; 451 int chk_addr_ret; 452 int err; 453 454 /* If the socket has its own bind function then use it. (RAW) */ 455 if (sk->sk_prot->bind) { 456 err = sk->sk_prot->bind(sk, uaddr, addr_len); 457 goto out; 458 } 459 err = -EINVAL; 460 if (addr_len < sizeof(struct sockaddr_in)) 461 goto out; 462 463 chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr); 464 465 /* Not specified by any standard per-se, however it breaks too 466 * many applications when removed. It is unfortunate since 467 * allowing applications to make a non-local bind solves 468 * several problems with systems using dynamic addressing. 469 * (ie. your servers still start up even if your ISDN link 470 * is temporarily down) 471 */ 472 err = -EADDRNOTAVAIL; 473 if (!sysctl_ip_nonlocal_bind && 474 !(inet->freebind || inet->transparent) && 475 addr->sin_addr.s_addr != htonl(INADDR_ANY) && 476 chk_addr_ret != RTN_LOCAL && 477 chk_addr_ret != RTN_MULTICAST && 478 chk_addr_ret != RTN_BROADCAST) 479 goto out; 480 481 snum = ntohs(addr->sin_port); 482 err = -EACCES; 483 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) 484 goto out; 485 486 /* We keep a pair of addresses. rcv_saddr is the one 487 * used by hash lookups, and saddr is used for transmit. 488 * 489 * In the BSD API these are the same except where it 490 * would be illegal to use them (multicast/broadcast) in 491 * which case the sending device address is used. 492 */ 493 lock_sock(sk); 494 495 /* Check these errors (active socket, double bind). */ 496 err = -EINVAL; 497 if (sk->sk_state != TCP_CLOSE || inet->inet_num) 498 goto out_release_sock; 499 500 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 501 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 502 inet->inet_saddr = 0; /* Use device */ 503 504 /* Make sure we are allowed to bind here. */ 505 if (sk->sk_prot->get_port(sk, snum)) { 506 inet->inet_saddr = inet->inet_rcv_saddr = 0; 507 err = -EADDRINUSE; 508 goto out_release_sock; 509 } 510 511 if (inet->inet_rcv_saddr) 512 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 513 if (snum) 514 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 515 inet->inet_sport = htons(inet->inet_num); 516 inet->inet_daddr = 0; 517 inet->inet_dport = 0; 518 sk_dst_reset(sk); 519 err = 0; 520out_release_sock: 521 release_sock(sk); 522out: 523 return err; 524} 525EXPORT_SYMBOL(inet_bind); 526 527int 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)->inet_num && inet_autobind(sk)) 536 return -EAGAIN; 537 return sk->sk_prot->connect(sk, (struct sockaddr *)uaddr, addr_len); 538} 539EXPORT_SYMBOL(inet_dgram_connect); 540 541static long inet_wait_for_connect(struct sock *sk, long timeo) 542{ 543 DEFINE_WAIT(wait); 544 545 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 546 547 /* Basic assumption: if someone sets sk->sk_err, he _must_ 548 * change state of the socket from TCP_SYN_*. 549 * Connect() does not allow to get error notifications 550 * without closing the socket. 551 */ 552 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 553 release_sock(sk); 554 timeo = schedule_timeout(timeo); 555 lock_sock(sk); 556 if (signal_pending(current) || !timeo) 557 break; 558 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 559 } 560 finish_wait(sk->sk_sleep, &wait); 561 return timeo; 562} 563 564/* 565 * Connect to a remote host. There is regrettably still a little 566 * TCP 'magic' in here. 567 */ 568int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 569 int addr_len, int flags) 570{ 571 struct sock *sk = sock->sk; 572 int err; 573 long timeo; 574 575 lock_sock(sk); 576 577 if (uaddr->sa_family == AF_UNSPEC) { 578 err = sk->sk_prot->disconnect(sk, flags); 579 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 580 goto out; 581 } 582 583 switch (sock->state) { 584 default: 585 err = -EINVAL; 586 goto out; 587 case SS_CONNECTED: 588 err = -EISCONN; 589 goto out; 590 case SS_CONNECTING: 591 err = -EALREADY; 592 /* Fall out of switch with err, set for this state */ 593 break; 594 case SS_UNCONNECTED: 595 err = -EISCONN; 596 if (sk->sk_state != TCP_CLOSE) 597 goto out; 598 599 err = sk->sk_prot->connect(sk, uaddr, addr_len); 600 if (err < 0) 601 goto out; 602 603 sock->state = SS_CONNECTING; 604 605 /* Just entered SS_CONNECTING state; the only 606 * difference is that return value in non-blocking 607 * case is EINPROGRESS, rather than EALREADY. 608 */ 609 err = -EINPROGRESS; 610 break; 611 } 612 613 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 614 615 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 616 /* Error code is set above */ 617 if (!timeo || !inet_wait_for_connect(sk, timeo)) 618 goto out; 619 620 err = sock_intr_errno(timeo); 621 if (signal_pending(current)) 622 goto out; 623 } 624 625 /* Connection was closed by RST, timeout, ICMP error 626 * or another process disconnected us. 627 */ 628 if (sk->sk_state == TCP_CLOSE) 629 goto sock_error; 630 631 /* sk->sk_err may be not zero now, if RECVERR was ordered by user 632 * and error was received after socket entered established state. 633 * Hence, it is handled normally after connect() return successfully. 634 */ 635 636 sock->state = SS_CONNECTED; 637 err = 0; 638out: 639 release_sock(sk); 640 return err; 641 642sock_error: 643 err = sock_error(sk) ? : -ECONNABORTED; 644 sock->state = SS_UNCONNECTED; 645 if (sk->sk_prot->disconnect(sk, flags)) 646 sock->state = SS_DISCONNECTING; 647 goto out; 648} 649EXPORT_SYMBOL(inet_stream_connect); 650 651/* 652 * Accept a pending connection. The TCP layer now gives BSD semantics. 653 */ 654 655int inet_accept(struct socket *sock, struct socket *newsock, int flags) 656{ 657 struct sock *sk1 = sock->sk; 658 int err = -EINVAL; 659 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err); 660 661 if (!sk2) 662 goto do_err; 663 664 lock_sock(sk2); 665 666 WARN_ON(!((1 << sk2->sk_state) & 667 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE))); 668 669 sock_graft(sk2, newsock); 670 671 newsock->state = SS_CONNECTED; 672 err = 0; 673 release_sock(sk2); 674do_err: 675 return err; 676} 677EXPORT_SYMBOL(inet_accept); 678 679 680/* 681 * This does both peername and sockname. 682 */ 683int inet_getname(struct socket *sock, struct sockaddr *uaddr, 684 int *uaddr_len, int peer) 685{ 686 struct sock *sk = sock->sk; 687 struct inet_sock *inet = inet_sk(sk); 688 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr); 689 690 sin->sin_family = AF_INET; 691 if (peer) { 692 if (!inet->inet_dport || 693 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 694 peer == 1)) 695 return -ENOTCONN; 696 sin->sin_port = inet->inet_dport; 697 sin->sin_addr.s_addr = inet->inet_daddr; 698 } else { 699 __be32 addr = inet->inet_rcv_saddr; 700 if (!addr) 701 addr = inet->inet_saddr; 702 sin->sin_port = inet->inet_sport; 703 sin->sin_addr.s_addr = addr; 704 } 705 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 706 *uaddr_len = sizeof(*sin); 707 return 0; 708} 709EXPORT_SYMBOL(inet_getname); 710 711int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 712 size_t size) 713{ 714 struct sock *sk = sock->sk; 715 716 /* We may need to bind the socket. */ 717 if (!inet_sk(sk)->inet_num && inet_autobind(sk)) 718 return -EAGAIN; 719 720 return sk->sk_prot->sendmsg(iocb, sk, msg, size); 721} 722EXPORT_SYMBOL(inet_sendmsg); 723 724 725static ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, 726 size_t size, int flags) 727{ 728 struct sock *sk = sock->sk; 729 730 /* We may need to bind the socket. */ 731 if (!inet_sk(sk)->inet_num && inet_autobind(sk)) 732 return -EAGAIN; 733 734 if (sk->sk_prot->sendpage) 735 return sk->sk_prot->sendpage(sk, page, offset, size, flags); 736 return sock_no_sendpage(sock, page, offset, size, flags); 737} 738 739 740int inet_shutdown(struct socket *sock, int how) 741{ 742 struct sock *sk = sock->sk; 743 int err = 0; 744 745 /* This should really check to make sure 746 * the socket is a TCP socket. (WHY AC...) 747 */ 748 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and 749 1->2 bit 2 snds. 750 2->3 */ 751 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ 752 return -EINVAL; 753 754 lock_sock(sk); 755 if (sock->state == SS_CONNECTING) { 756 if ((1 << sk->sk_state) & 757 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) 758 sock->state = SS_DISCONNECTING; 759 else 760 sock->state = SS_CONNECTED; 761 } 762 763 switch (sk->sk_state) { 764 case TCP_CLOSE: 765 err = -ENOTCONN; 766 /* Hack to wake up other listeners, who can poll for 767 POLLHUP, even on eg. unconnected UDP sockets -- RR */ 768 default: 769 sk->sk_shutdown |= how; 770 if (sk->sk_prot->shutdown) 771 sk->sk_prot->shutdown(sk, how); 772 break; 773 774 /* Remaining two branches are temporary solution for missing 775 * close() in multithreaded environment. It is _not_ a good idea, 776 * but we have no choice until close() is repaired at VFS level. 777 */ 778 case TCP_LISTEN: 779 if (!(how & RCV_SHUTDOWN)) 780 break; 781 /* Fall through */ 782 case TCP_SYN_SENT: 783 err = sk->sk_prot->disconnect(sk, O_NONBLOCK); 784 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 785 break; 786 } 787 788 /* Wake up anyone sleeping in poll. */ 789 sk->sk_state_change(sk); 790 release_sock(sk); 791 return err; 792} 793EXPORT_SYMBOL(inet_shutdown); 794 795/* 796 * ioctl() calls you can issue on an INET socket. Most of these are 797 * device configuration and stuff and very rarely used. Some ioctls 798 * pass on to the socket itself. 799 * 800 * NOTE: I like the idea of a module for the config stuff. ie ifconfig 801 * loads the devconfigure module does its configuring and unloads it. 802 * There's a good 20K of config code hanging around the kernel. 803 */ 804 805int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 806{ 807 struct sock *sk = sock->sk; 808 int err = 0; 809 struct net *net = sock_net(sk); 810 811 switch (cmd) { 812 case SIOCGSTAMP: 813 err = sock_get_timestamp(sk, (struct timeval __user *)arg); 814 break; 815 case SIOCGSTAMPNS: 816 err = sock_get_timestampns(sk, (struct timespec __user *)arg); 817 break; 818 case SIOCADDRT: 819 case SIOCDELRT: 820 case SIOCRTMSG: 821 err = ip_rt_ioctl(net, cmd, (void __user *)arg); 822 break; 823 case SIOCDARP: 824 case SIOCGARP: 825 case SIOCSARP: 826 err = arp_ioctl(net, cmd, (void __user *)arg); 827 break; 828 case SIOCGIFADDR: 829 case SIOCSIFADDR: 830 case SIOCGIFBRDADDR: 831 case SIOCSIFBRDADDR: 832 case SIOCGIFNETMASK: 833 case SIOCSIFNETMASK: 834 case SIOCGIFDSTADDR: 835 case SIOCSIFDSTADDR: 836 case SIOCSIFPFLAGS: 837 case SIOCGIFPFLAGS: 838 case SIOCSIFFLAGS: 839 err = devinet_ioctl(net, cmd, (void __user *)arg); 840 break; 841 default: 842 if (sk->sk_prot->ioctl) 843 err = sk->sk_prot->ioctl(sk, cmd, arg); 844 else 845 err = -ENOIOCTLCMD; 846 break; 847 } 848 return err; 849} 850EXPORT_SYMBOL(inet_ioctl); 851 852const struct proto_ops inet_stream_ops = { 853 .family = PF_INET, 854 .owner = THIS_MODULE, 855 .release = inet_release, 856 .bind = inet_bind, 857 .connect = inet_stream_connect, 858 .socketpair = sock_no_socketpair, 859 .accept = inet_accept, 860 .getname = inet_getname, 861 .poll = tcp_poll, 862 .ioctl = inet_ioctl, 863 .listen = inet_listen, 864 .shutdown = inet_shutdown, 865 .setsockopt = sock_common_setsockopt, 866 .getsockopt = sock_common_getsockopt, 867 .sendmsg = tcp_sendmsg, 868 .recvmsg = sock_common_recvmsg, 869 .mmap = sock_no_mmap, 870 .sendpage = tcp_sendpage, 871 .splice_read = tcp_splice_read, 872#ifdef CONFIG_COMPAT 873 .compat_setsockopt = compat_sock_common_setsockopt, 874 .compat_getsockopt = compat_sock_common_getsockopt, 875#endif 876}; 877EXPORT_SYMBOL(inet_stream_ops); 878 879const struct proto_ops inet_dgram_ops = { 880 .family = PF_INET, 881 .owner = THIS_MODULE, 882 .release = inet_release, 883 .bind = inet_bind, 884 .connect = inet_dgram_connect, 885 .socketpair = sock_no_socketpair, 886 .accept = sock_no_accept, 887 .getname = inet_getname, 888 .poll = udp_poll, 889 .ioctl = inet_ioctl, 890 .listen = sock_no_listen, 891 .shutdown = inet_shutdown, 892 .setsockopt = sock_common_setsockopt, 893 .getsockopt = sock_common_getsockopt, 894 .sendmsg = inet_sendmsg, 895 .recvmsg = sock_common_recvmsg, 896 .mmap = sock_no_mmap, 897 .sendpage = inet_sendpage, 898#ifdef CONFIG_COMPAT 899 .compat_setsockopt = compat_sock_common_setsockopt, 900 .compat_getsockopt = compat_sock_common_getsockopt, 901#endif 902}; 903EXPORT_SYMBOL(inet_dgram_ops); 904 905/* 906 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 907 * udp_poll 908 */ 909static const struct proto_ops inet_sockraw_ops = { 910 .family = PF_INET, 911 .owner = THIS_MODULE, 912 .release = inet_release, 913 .bind = inet_bind, 914 .connect = inet_dgram_connect, 915 .socketpair = sock_no_socketpair, 916 .accept = sock_no_accept, 917 .getname = inet_getname, 918 .poll = datagram_poll, 919 .ioctl = inet_ioctl, 920 .listen = sock_no_listen, 921 .shutdown = inet_shutdown, 922 .setsockopt = sock_common_setsockopt, 923 .getsockopt = sock_common_getsockopt, 924 .sendmsg = inet_sendmsg, 925 .recvmsg = sock_common_recvmsg, 926 .mmap = sock_no_mmap, 927 .sendpage = inet_sendpage, 928#ifdef CONFIG_COMPAT 929 .compat_setsockopt = compat_sock_common_setsockopt, 930 .compat_getsockopt = compat_sock_common_getsockopt, 931#endif 932}; 933 934static const struct net_proto_family inet_family_ops = { 935 .family = PF_INET, 936 .create = inet_create, 937 .owner = THIS_MODULE, 938}; 939 940/* Upon startup we insert all the elements in inetsw_array[] into 941 * the linked list inetsw. 942 */ 943static struct inet_protosw inetsw_array[] = 944{ 945 { 946 .type = SOCK_STREAM, 947 .protocol = IPPROTO_TCP, 948 .prot = &tcp_prot, 949 .ops = &inet_stream_ops, 950 .no_check = 0, 951 .flags = INET_PROTOSW_PERMANENT | 952 INET_PROTOSW_ICSK, 953 }, 954 955 { 956 .type = SOCK_DGRAM, 957 .protocol = IPPROTO_UDP, 958 .prot = &udp_prot, 959 .ops = &inet_dgram_ops, 960 .no_check = UDP_CSUM_DEFAULT, 961 .flags = INET_PROTOSW_PERMANENT, 962 }, 963 964 965 { 966 .type = SOCK_RAW, 967 .protocol = IPPROTO_IP, /* wild card */ 968 .prot = &raw_prot, 969 .ops = &inet_sockraw_ops, 970 .no_check = UDP_CSUM_DEFAULT, 971 .flags = INET_PROTOSW_REUSE, 972 } 973}; 974 975#define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) 976 977void inet_register_protosw(struct inet_protosw *p) 978{ 979 struct list_head *lh; 980 struct inet_protosw *answer; 981 int protocol = p->protocol; 982 struct list_head *last_perm; 983 984 spin_lock_bh(&inetsw_lock); 985 986 if (p->type >= SOCK_MAX) 987 goto out_illegal; 988 989 /* If we are trying to override a permanent protocol, bail. */ 990 answer = NULL; 991 last_perm = &inetsw[p->type]; 992 list_for_each(lh, &inetsw[p->type]) { 993 answer = list_entry(lh, struct inet_protosw, list); 994 995 /* Check only the non-wild match. */ 996 if (INET_PROTOSW_PERMANENT & answer->flags) { 997 if (protocol == answer->protocol) 998 break; 999 last_perm = lh; 1000 } 1001 1002 answer = NULL; 1003 } 1004 if (answer) 1005 goto out_permanent; 1006 1007 /* Add the new entry after the last permanent entry if any, so that 1008 * the new entry does not override a permanent entry when matched with 1009 * a wild-card protocol. But it is allowed to override any existing 1010 * non-permanent entry. This means that when we remove this entry, the 1011 * system automatically returns to the old behavior. 1012 */ 1013 list_add_rcu(&p->list, last_perm); 1014out: 1015 spin_unlock_bh(&inetsw_lock); 1016 1017 return; 1018 1019out_permanent: 1020 printk(KERN_ERR "Attempt to override permanent protocol %d.\n", 1021 protocol); 1022 goto out; 1023 1024out_illegal: 1025 printk(KERN_ERR 1026 "Ignoring attempt to register invalid socket type %d.\n", 1027 p->type); 1028 goto out; 1029} 1030EXPORT_SYMBOL(inet_register_protosw); 1031 1032void inet_unregister_protosw(struct inet_protosw *p) 1033{ 1034 if (INET_PROTOSW_PERMANENT & p->flags) { 1035 printk(KERN_ERR 1036 "Attempt to unregister permanent protocol %d.\n", 1037 p->protocol); 1038 } else { 1039 spin_lock_bh(&inetsw_lock); 1040 list_del_rcu(&p->list); 1041 spin_unlock_bh(&inetsw_lock); 1042 1043 synchronize_net(); 1044 } 1045} 1046EXPORT_SYMBOL(inet_unregister_protosw); 1047 1048/* 1049 * Shall we try to damage output packets if routing dev changes? 1050 */ 1051 1052int sysctl_ip_dynaddr __read_mostly; 1053 1054static int inet_sk_reselect_saddr(struct sock *sk) 1055{ 1056 struct inet_sock *inet = inet_sk(sk); 1057 int err; 1058 struct rtable *rt; 1059 __be32 old_saddr = inet->inet_saddr; 1060 __be32 new_saddr; 1061 __be32 daddr = inet->inet_daddr; 1062 1063 if (inet->opt && inet->opt->srr) 1064 daddr = inet->opt->faddr; 1065 1066 /* Query new route. */ 1067 err = ip_route_connect(&rt, daddr, 0, 1068 RT_CONN_FLAGS(sk), 1069 sk->sk_bound_dev_if, 1070 sk->sk_protocol, 1071 inet->inet_sport, inet->inet_dport, sk, 0); 1072 if (err) 1073 return err; 1074 1075 sk_setup_caps(sk, &rt->u.dst); 1076 1077 new_saddr = rt->rt_src; 1078 1079 if (new_saddr == old_saddr) 1080 return 0; 1081 1082 if (sysctl_ip_dynaddr > 1) { 1083 printk(KERN_INFO "%s(): shifting inet->saddr from %pI4 to %pI4\n", 1084 __func__, &old_saddr, &new_saddr); 1085 } 1086 1087 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr; 1088 1089 /* 1090 * XXX The only one ugly spot where we need to 1091 * XXX really change the sockets identity after 1092 * XXX it has entered the hashes. -DaveM 1093 * 1094 * Besides that, it does not check for connection 1095 * uniqueness. Wait for troubles. 1096 */ 1097 __sk_prot_rehash(sk); 1098 return 0; 1099} 1100 1101int inet_sk_rebuild_header(struct sock *sk) 1102{ 1103 struct inet_sock *inet = inet_sk(sk); 1104 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); 1105 __be32 daddr; 1106 int err; 1107 1108 /* Route is OK, nothing to do. */ 1109 if (rt) 1110 return 0; 1111 1112 /* Reroute. */ 1113 daddr = inet->inet_daddr; 1114 if (inet->opt && inet->opt->srr) 1115 daddr = inet->opt->faddr; 1116{ 1117 struct flowi fl = { 1118 .oif = sk->sk_bound_dev_if, 1119 .mark = sk->sk_mark, 1120 .nl_u = { 1121 .ip4_u = { 1122 .daddr = daddr, 1123 .saddr = inet->inet_saddr, 1124 .tos = RT_CONN_FLAGS(sk), 1125 }, 1126 }, 1127 .proto = sk->sk_protocol, 1128 .flags = inet_sk_flowi_flags(sk), 1129 .uli_u = { 1130 .ports = { 1131 .sport = inet->inet_sport, 1132 .dport = inet->inet_dport, 1133 }, 1134 }, 1135 }; 1136 1137 security_sk_classify_flow(sk, &fl); 1138 err = ip_route_output_flow(sock_net(sk), &rt, &fl, sk, 0); 1139} 1140 if (!err) 1141 sk_setup_caps(sk, &rt->u.dst); 1142 else { 1143 /* Routing failed... */ 1144 sk->sk_route_caps = 0; 1145 /* 1146 * Other protocols have to map its equivalent state to TCP_SYN_SENT. 1147 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme 1148 */ 1149 if (!sysctl_ip_dynaddr || 1150 sk->sk_state != TCP_SYN_SENT || 1151 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 1152 (err = inet_sk_reselect_saddr(sk)) != 0) 1153 sk->sk_err_soft = -err; 1154 } 1155 1156 return err; 1157} 1158EXPORT_SYMBOL(inet_sk_rebuild_header); 1159 1160static int inet_gso_send_check(struct sk_buff *skb) 1161{ 1162 struct iphdr *iph; 1163 const struct net_protocol *ops; 1164 int proto; 1165 int ihl; 1166 int err = -EINVAL; 1167 1168 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1169 goto out; 1170 1171 iph = ip_hdr(skb); 1172 ihl = iph->ihl * 4; 1173 if (ihl < sizeof(*iph)) 1174 goto out; 1175 1176 if (unlikely(!pskb_may_pull(skb, ihl))) 1177 goto out; 1178 1179 __skb_pull(skb, ihl); 1180 skb_reset_transport_header(skb); 1181 iph = ip_hdr(skb); 1182 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1183 err = -EPROTONOSUPPORT; 1184 1185 rcu_read_lock(); 1186 ops = rcu_dereference(inet_protos[proto]); 1187 if (likely(ops && ops->gso_send_check)) 1188 err = ops->gso_send_check(skb); 1189 rcu_read_unlock(); 1190 1191out: 1192 return err; 1193} 1194 1195static struct sk_buff *inet_gso_segment(struct sk_buff *skb, int features) 1196{ 1197 struct sk_buff *segs = ERR_PTR(-EINVAL); 1198 struct iphdr *iph; 1199 const struct net_protocol *ops; 1200 int proto; 1201 int ihl; 1202 int id; 1203 unsigned int offset = 0; 1204 1205 if (!(features & NETIF_F_V4_CSUM)) 1206 features &= ~NETIF_F_SG; 1207 1208 if (unlikely(skb_shinfo(skb)->gso_type & 1209 ~(SKB_GSO_TCPV4 | 1210 SKB_GSO_UDP | 1211 SKB_GSO_DODGY | 1212 SKB_GSO_TCP_ECN | 1213 0))) 1214 goto out; 1215 1216 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1217 goto out; 1218 1219 iph = ip_hdr(skb); 1220 ihl = iph->ihl * 4; 1221 if (ihl < sizeof(*iph)) 1222 goto out; 1223 1224 if (unlikely(!pskb_may_pull(skb, ihl))) 1225 goto out; 1226 1227 __skb_pull(skb, ihl); 1228 skb_reset_transport_header(skb); 1229 iph = ip_hdr(skb); 1230 id = ntohs(iph->id); 1231 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1232 segs = ERR_PTR(-EPROTONOSUPPORT); 1233 1234 rcu_read_lock(); 1235 ops = rcu_dereference(inet_protos[proto]); 1236 if (likely(ops && ops->gso_segment)) 1237 segs = ops->gso_segment(skb, features); 1238 rcu_read_unlock(); 1239 1240 if (!segs || IS_ERR(segs)) 1241 goto out; 1242 1243 skb = segs; 1244 do { 1245 iph = ip_hdr(skb); 1246 if (proto == IPPROTO_UDP) { 1247 iph->id = htons(id); 1248 iph->frag_off = htons(offset >> 3); 1249 if (skb->next != NULL) 1250 iph->frag_off |= htons(IP_MF); 1251 offset += (skb->len - skb->mac_len - iph->ihl * 4); 1252 } else 1253 iph->id = htons(id++); 1254 iph->tot_len = htons(skb->len - skb->mac_len); 1255 iph->check = 0; 1256 iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl); 1257 } while ((skb = skb->next)); 1258 1259out: 1260 return segs; 1261} 1262 1263static struct sk_buff **inet_gro_receive(struct sk_buff **head, 1264 struct sk_buff *skb) 1265{ 1266 const struct net_protocol *ops; 1267 struct sk_buff **pp = NULL; 1268 struct sk_buff *p; 1269 struct iphdr *iph; 1270 unsigned int hlen; 1271 unsigned int off; 1272 unsigned int id; 1273 int flush = 1; 1274 int proto; 1275 1276 off = skb_gro_offset(skb); 1277 hlen = off + sizeof(*iph); 1278 iph = skb_gro_header_fast(skb, off); 1279 if (skb_gro_header_hard(skb, hlen)) { 1280 iph = skb_gro_header_slow(skb, hlen, off); 1281 if (unlikely(!iph)) 1282 goto out; 1283 } 1284 1285 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1286 1287 rcu_read_lock(); 1288 ops = rcu_dereference(inet_protos[proto]); 1289 if (!ops || !ops->gro_receive) 1290 goto out_unlock; 1291 1292 if (*(u8 *)iph != 0x45) 1293 goto out_unlock; 1294 1295 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) 1296 goto out_unlock; 1297 1298 id = ntohl(*(u32 *)&iph->id); 1299 flush = (u16)((ntohl(*(u32 *)iph) ^ skb_gro_len(skb)) | (id ^ IP_DF)); 1300 id >>= 16; 1301 1302 for (p = *head; p; p = p->next) { 1303 struct iphdr *iph2; 1304 1305 if (!NAPI_GRO_CB(p)->same_flow) 1306 continue; 1307 1308 iph2 = ip_hdr(p); 1309 1310 if ((iph->protocol ^ iph2->protocol) | 1311 (iph->tos ^ iph2->tos) | 1312 (iph->saddr ^ iph2->saddr) | 1313 (iph->daddr ^ iph2->daddr)) { 1314 NAPI_GRO_CB(p)->same_flow = 0; 1315 continue; 1316 } 1317 1318 /* All fields must match except length and checksum. */ 1319 NAPI_GRO_CB(p)->flush |= 1320 (iph->ttl ^ iph2->ttl) | 1321 ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id); 1322 1323 NAPI_GRO_CB(p)->flush |= flush; 1324 } 1325 1326 NAPI_GRO_CB(skb)->flush |= flush; 1327 skb_gro_pull(skb, sizeof(*iph)); 1328 skb_set_transport_header(skb, skb_gro_offset(skb)); 1329 1330 pp = ops->gro_receive(head, skb); 1331 1332out_unlock: 1333 rcu_read_unlock(); 1334 1335out: 1336 NAPI_GRO_CB(skb)->flush |= flush; 1337 1338 return pp; 1339} 1340 1341static int inet_gro_complete(struct sk_buff *skb) 1342{ 1343 const struct net_protocol *ops; 1344 struct iphdr *iph = ip_hdr(skb); 1345 int proto = iph->protocol & (MAX_INET_PROTOS - 1); 1346 int err = -ENOSYS; 1347 __be16 newlen = htons(skb->len - skb_network_offset(skb)); 1348 1349 csum_replace2(&iph->check, iph->tot_len, newlen); 1350 iph->tot_len = newlen; 1351 1352 rcu_read_lock(); 1353 ops = rcu_dereference(inet_protos[proto]); 1354 if (WARN_ON(!ops || !ops->gro_complete)) 1355 goto out_unlock; 1356 1357 err = ops->gro_complete(skb); 1358 1359out_unlock: 1360 rcu_read_unlock(); 1361 1362 return err; 1363} 1364 1365int inet_ctl_sock_create(struct sock **sk, unsigned short family, 1366 unsigned short type, unsigned char protocol, 1367 struct net *net) 1368{ 1369 struct socket *sock; 1370 int rc = sock_create_kern(family, type, protocol, &sock); 1371 1372 if (rc == 0) { 1373 *sk = sock->sk; 1374 (*sk)->sk_allocation = GFP_ATOMIC; 1375 /* 1376 * Unhash it so that IP input processing does not even see it, 1377 * we do not wish this socket to see incoming packets. 1378 */ 1379 (*sk)->sk_prot->unhash(*sk); 1380 1381 sk_change_net(*sk, net); 1382 } 1383 return rc; 1384} 1385EXPORT_SYMBOL_GPL(inet_ctl_sock_create); 1386 1387unsigned long snmp_fold_field(void *mib[], int offt) 1388{ 1389 unsigned long res = 0; 1390 int i; 1391 1392 for_each_possible_cpu(i) { 1393 res += *(((unsigned long *) per_cpu_ptr(mib[0], i)) + offt); 1394 res += *(((unsigned long *) per_cpu_ptr(mib[1], i)) + offt); 1395 } 1396 return res; 1397} 1398EXPORT_SYMBOL_GPL(snmp_fold_field); 1399 1400int snmp_mib_init(void *ptr[2], size_t mibsize) 1401{ 1402 BUG_ON(ptr == NULL); 1403 ptr[0] = __alloc_percpu(mibsize, __alignof__(unsigned long long)); 1404 if (!ptr[0]) 1405 goto err0; 1406 ptr[1] = __alloc_percpu(mibsize, __alignof__(unsigned long long)); 1407 if (!ptr[1]) 1408 goto err1; 1409 return 0; 1410err1: 1411 free_percpu(ptr[0]); 1412 ptr[0] = NULL; 1413err0: 1414 return -ENOMEM; 1415} 1416EXPORT_SYMBOL_GPL(snmp_mib_init); 1417 1418void snmp_mib_free(void *ptr[2]) 1419{ 1420 BUG_ON(ptr == NULL); 1421 free_percpu(ptr[0]); 1422 free_percpu(ptr[1]); 1423 ptr[0] = ptr[1] = NULL; 1424} 1425EXPORT_SYMBOL_GPL(snmp_mib_free); 1426 1427#ifdef CONFIG_IP_MULTICAST 1428static const struct net_protocol igmp_protocol = { 1429 .handler = igmp_rcv, 1430 .netns_ok = 1, 1431}; 1432#endif 1433 1434static const struct net_protocol tcp_protocol = { 1435 .handler = tcp_v4_rcv, 1436 .err_handler = tcp_v4_err, 1437 .gso_send_check = tcp_v4_gso_send_check, 1438 .gso_segment = tcp_tso_segment, 1439 .gro_receive = tcp4_gro_receive, 1440 .gro_complete = tcp4_gro_complete, 1441 .no_policy = 1, 1442 .netns_ok = 1, 1443}; 1444 1445static const struct net_protocol udp_protocol = { 1446 .handler = udp_rcv, 1447 .err_handler = udp_err, 1448 .gso_send_check = udp4_ufo_send_check, 1449 .gso_segment = udp4_ufo_fragment, 1450 .no_policy = 1, 1451 .netns_ok = 1, 1452}; 1453 1454static const struct net_protocol icmp_protocol = { 1455 .handler = icmp_rcv, 1456 .no_policy = 1, 1457 .netns_ok = 1, 1458}; 1459 1460static __net_init int ipv4_mib_init_net(struct net *net) 1461{ 1462 if (snmp_mib_init((void **)net->mib.tcp_statistics, 1463 sizeof(struct tcp_mib)) < 0) 1464 goto err_tcp_mib; 1465 if (snmp_mib_init((void **)net->mib.ip_statistics, 1466 sizeof(struct ipstats_mib)) < 0) 1467 goto err_ip_mib; 1468 if (snmp_mib_init((void **)net->mib.net_statistics, 1469 sizeof(struct linux_mib)) < 0) 1470 goto err_net_mib; 1471 if (snmp_mib_init((void **)net->mib.udp_statistics, 1472 sizeof(struct udp_mib)) < 0) 1473 goto err_udp_mib; 1474 if (snmp_mib_init((void **)net->mib.udplite_statistics, 1475 sizeof(struct udp_mib)) < 0) 1476 goto err_udplite_mib; 1477 if (snmp_mib_init((void **)net->mib.icmp_statistics, 1478 sizeof(struct icmp_mib)) < 0) 1479 goto err_icmp_mib; 1480 if (snmp_mib_init((void **)net->mib.icmpmsg_statistics, 1481 sizeof(struct icmpmsg_mib)) < 0) 1482 goto err_icmpmsg_mib; 1483 1484 tcp_mib_init(net); 1485 return 0; 1486 1487err_icmpmsg_mib: 1488 snmp_mib_free((void **)net->mib.icmp_statistics); 1489err_icmp_mib: 1490 snmp_mib_free((void **)net->mib.udplite_statistics); 1491err_udplite_mib: 1492 snmp_mib_free((void **)net->mib.udp_statistics); 1493err_udp_mib: 1494 snmp_mib_free((void **)net->mib.net_statistics); 1495err_net_mib: 1496 snmp_mib_free((void **)net->mib.ip_statistics); 1497err_ip_mib: 1498 snmp_mib_free((void **)net->mib.tcp_statistics); 1499err_tcp_mib: 1500 return -ENOMEM; 1501} 1502 1503static __net_exit void ipv4_mib_exit_net(struct net *net) 1504{ 1505 snmp_mib_free((void **)net->mib.icmpmsg_statistics); 1506 snmp_mib_free((void **)net->mib.icmp_statistics); 1507 snmp_mib_free((void **)net->mib.udplite_statistics); 1508 snmp_mib_free((void **)net->mib.udp_statistics); 1509 snmp_mib_free((void **)net->mib.net_statistics); 1510 snmp_mib_free((void **)net->mib.ip_statistics); 1511 snmp_mib_free((void **)net->mib.tcp_statistics); 1512} 1513 1514static __net_initdata struct pernet_operations ipv4_mib_ops = { 1515 .init = ipv4_mib_init_net, 1516 .exit = ipv4_mib_exit_net, 1517}; 1518 1519static int __init init_ipv4_mibs(void) 1520{ 1521 return register_pernet_subsys(&ipv4_mib_ops); 1522} 1523 1524static int ipv4_proc_init(void); 1525 1526/* 1527 * IP protocol layer initialiser 1528 */ 1529 1530static struct packet_type ip_packet_type __read_mostly = { 1531 .type = cpu_to_be16(ETH_P_IP), 1532 .func = ip_rcv, 1533 .gso_send_check = inet_gso_send_check, 1534 .gso_segment = inet_gso_segment, 1535 .gro_receive = inet_gro_receive, 1536 .gro_complete = inet_gro_complete, 1537}; 1538 1539static int __init inet_init(void) 1540{ 1541 struct sk_buff *dummy_skb; 1542 struct inet_protosw *q; 1543 struct list_head *r; 1544 int rc = -EINVAL; 1545 1546 BUILD_BUG_ON(sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb)); 1547 1548 rc = proto_register(&tcp_prot, 1); 1549 if (rc) 1550 goto out; 1551 1552 rc = proto_register(&udp_prot, 1); 1553 if (rc) 1554 goto out_unregister_tcp_proto; 1555 1556 rc = proto_register(&raw_prot, 1); 1557 if (rc) 1558 goto out_unregister_udp_proto; 1559 1560 /* 1561 * Tell SOCKET that we are alive... 1562 */ 1563 1564 (void)sock_register(&inet_family_ops); 1565 1566#ifdef CONFIG_SYSCTL 1567 ip_static_sysctl_init(); 1568#endif 1569 1570 /* 1571 * Add all the base protocols. 1572 */ 1573 1574 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 1575 printk(KERN_CRIT "inet_init: Cannot add ICMP protocol\n"); 1576 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) 1577 printk(KERN_CRIT "inet_init: Cannot add UDP protocol\n"); 1578 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) 1579 printk(KERN_CRIT "inet_init: Cannot add TCP protocol\n"); 1580#ifdef CONFIG_IP_MULTICAST 1581 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 1582 printk(KERN_CRIT "inet_init: Cannot add IGMP protocol\n"); 1583#endif 1584 1585 /* Register the socket-side information for inet_create. */ 1586 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 1587 INIT_LIST_HEAD(r); 1588 1589 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 1590 inet_register_protosw(q); 1591 1592 /* 1593 * Set the ARP module up 1594 */ 1595 1596 arp_init(); 1597 1598 /* 1599 * Set the IP module up 1600 */ 1601 1602 ip_init(); 1603 1604 tcp_v4_init(); 1605 1606 /* Setup TCP slab cache for open requests. */ 1607 tcp_init(); 1608 1609 /* Setup UDP memory threshold */ 1610 udp_init(); 1611 1612 /* Add UDP-Lite (RFC 3828) */ 1613 udplite4_register(); 1614 1615 /* 1616 * Set the ICMP layer up 1617 */ 1618 1619 if (icmp_init() < 0) 1620 panic("Failed to create the ICMP control socket.\n"); 1621 1622 /* 1623 * Initialise the multicast router 1624 */ 1625#if defined(CONFIG_IP_MROUTE) 1626 if (ip_mr_init()) 1627 printk(KERN_CRIT "inet_init: Cannot init ipv4 mroute\n"); 1628#endif 1629 /* 1630 * Initialise per-cpu ipv4 mibs 1631 */ 1632 1633 if (init_ipv4_mibs()) 1634 printk(KERN_CRIT "inet_init: Cannot init ipv4 mibs\n"); 1635 1636 ipv4_proc_init(); 1637 1638 ipfrag_init(); 1639 1640 dev_add_pack(&ip_packet_type); 1641 1642 rc = 0; 1643out: 1644 return rc; 1645out_unregister_udp_proto: 1646 proto_unregister(&udp_prot); 1647out_unregister_tcp_proto: 1648 proto_unregister(&tcp_prot); 1649 goto out; 1650} 1651 1652fs_initcall(inet_init); 1653 1654/* ------------------------------------------------------------------------ */ 1655 1656#ifdef CONFIG_PROC_FS 1657static int __init ipv4_proc_init(void) 1658{ 1659 int rc = 0; 1660 1661 if (raw_proc_init()) 1662 goto out_raw; 1663 if (tcp4_proc_init()) 1664 goto out_tcp; 1665 if (udp4_proc_init()) 1666 goto out_udp; 1667 if (ip_misc_proc_init()) 1668 goto out_misc; 1669out: 1670 return rc; 1671out_misc: 1672 udp4_proc_exit(); 1673out_udp: 1674 tcp4_proc_exit(); 1675out_tcp: 1676 raw_proc_exit(); 1677out_raw: 1678 rc = -ENOMEM; 1679 goto out; 1680} 1681 1682#else /* CONFIG_PROC_FS */ 1683static int __init ipv4_proc_init(void) 1684{ 1685 return 0; 1686} 1687#endif /* CONFIG_PROC_FS */ 1688 1689MODULE_ALIAS_NETPROTO(PF_INET); 1690 1691