af_inet.c revision c349a528cd47e2272ded0ea358363855e86180da
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#include <linux/slab.h> 90 91#include <asm/uaccess.h> 92#include <asm/system.h> 93 94#include <linux/inet.h> 95#include <linux/igmp.h> 96#include <linux/inetdevice.h> 97#include <linux/netdevice.h> 98#include <net/checksum.h> 99#include <net/ip.h> 100#include <net/protocol.h> 101#include <net/arp.h> 102#include <net/route.h> 103#include <net/ip_fib.h> 104#include <net/inet_connection_sock.h> 105#include <net/tcp.h> 106#include <net/udp.h> 107#include <net/udplite.h> 108#include <net/ping.h> 109#include <linux/skbuff.h> 110#include <net/sock.h> 111#include <net/raw.h> 112#include <net/icmp.h> 113#include <net/ipip.h> 114#include <net/inet_common.h> 115#include <net/xfrm.h> 116#include <net/net_namespace.h> 117#ifdef CONFIG_IP_MROUTE 118#include <linux/mroute.h> 119#endif 120 121 122/* The inetsw table contains everything that inet_create needs to 123 * build a new socket. 124 */ 125static struct list_head inetsw[SOCK_MAX]; 126static DEFINE_SPINLOCK(inetsw_lock); 127 128struct ipv4_config ipv4_config; 129EXPORT_SYMBOL(ipv4_config); 130 131/* New destruction routine */ 132 133void inet_sock_destruct(struct sock *sk) 134{ 135 struct inet_sock *inet = inet_sk(sk); 136 137 __skb_queue_purge(&sk->sk_receive_queue); 138 __skb_queue_purge(&sk->sk_error_queue); 139 140 sk_mem_reclaim(sk); 141 142 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) { 143 pr_err("Attempt to release TCP socket in state %d %p\n", 144 sk->sk_state, sk); 145 return; 146 } 147 if (!sock_flag(sk, SOCK_DEAD)) { 148 pr_err("Attempt to release alive inet socket %p\n", sk); 149 return; 150 } 151 152 WARN_ON(atomic_read(&sk->sk_rmem_alloc)); 153 WARN_ON(atomic_read(&sk->sk_wmem_alloc)); 154 WARN_ON(sk->sk_wmem_queued); 155 WARN_ON(sk->sk_forward_alloc); 156 157 kfree(rcu_dereference_protected(inet->inet_opt, 1)); 158 dst_release(rcu_dereference_check(sk->sk_dst_cache, 1)); 159 sk_refcnt_debug_dec(sk); 160} 161EXPORT_SYMBOL(inet_sock_destruct); 162 163/* 164 * The routines beyond this point handle the behaviour of an AF_INET 165 * socket object. Mostly it punts to the subprotocols of IP to do 166 * the work. 167 */ 168 169/* 170 * Automatically bind an unbound socket. 171 */ 172 173static int inet_autobind(struct sock *sk) 174{ 175 struct inet_sock *inet; 176 /* We may need to bind the socket. */ 177 lock_sock(sk); 178 inet = inet_sk(sk); 179 if (!inet->inet_num) { 180 if (sk->sk_prot->get_port(sk, 0)) { 181 release_sock(sk); 182 return -EAGAIN; 183 } 184 inet->inet_sport = htons(inet->inet_num); 185 } 186 release_sock(sk); 187 return 0; 188} 189 190/* 191 * Move a socket into listening state. 192 */ 193int inet_listen(struct socket *sock, int backlog) 194{ 195 struct sock *sk = sock->sk; 196 unsigned char old_state; 197 int err; 198 199 lock_sock(sk); 200 201 err = -EINVAL; 202 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM) 203 goto out; 204 205 old_state = sk->sk_state; 206 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN))) 207 goto out; 208 209 /* Really, if the socket is already in listen state 210 * we can only allow the backlog to be adjusted. 211 */ 212 if (old_state != TCP_LISTEN) { 213 err = inet_csk_listen_start(sk, backlog); 214 if (err) 215 goto out; 216 } 217 sk->sk_max_ack_backlog = backlog; 218 err = 0; 219 220out: 221 release_sock(sk); 222 return err; 223} 224EXPORT_SYMBOL(inet_listen); 225 226u32 inet_ehash_secret __read_mostly; 227EXPORT_SYMBOL(inet_ehash_secret); 228 229/* 230 * inet_ehash_secret must be set exactly once 231 */ 232void build_ehash_secret(void) 233{ 234 u32 rnd; 235 236 do { 237 get_random_bytes(&rnd, sizeof(rnd)); 238 } while (rnd == 0); 239 240 cmpxchg(&inet_ehash_secret, 0, rnd); 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 int kern) 267{ 268 struct sock *sk; 269 struct inet_protosw *answer; 270 struct inet_sock *inet; 271 struct proto *answer_prot; 272 unsigned char answer_flags; 273 char answer_no_check; 274 int try_loading_module = 0; 275 int err; 276 277 if (unlikely(!inet_ehash_secret)) 278 if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM) 279 build_ehash_secret(); 280 281 sock->state = SS_UNCONNECTED; 282 283 /* Look for the requested type/protocol pair. */ 284lookup_protocol: 285 err = -ESOCKTNOSUPPORT; 286 rcu_read_lock(); 287 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) { 288 289 err = 0; 290 /* Check the non-wild match. */ 291 if (protocol == answer->protocol) { 292 if (protocol != IPPROTO_IP) 293 break; 294 } else { 295 /* Check for the two wild cases. */ 296 if (IPPROTO_IP == protocol) { 297 protocol = answer->protocol; 298 break; 299 } 300 if (IPPROTO_IP == answer->protocol) 301 break; 302 } 303 err = -EPROTONOSUPPORT; 304 } 305 306 if (unlikely(err)) { 307 if (try_loading_module < 2) { 308 rcu_read_unlock(); 309 /* 310 * Be more specific, e.g. net-pf-2-proto-132-type-1 311 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) 312 */ 313 if (++try_loading_module == 1) 314 request_module("net-pf-%d-proto-%d-type-%d", 315 PF_INET, protocol, sock->type); 316 /* 317 * Fall back to generic, e.g. net-pf-2-proto-132 318 * (net-pf-PF_INET-proto-IPPROTO_SCTP) 319 */ 320 else 321 request_module("net-pf-%d-proto-%d", 322 PF_INET, protocol); 323 goto lookup_protocol; 324 } else 325 goto out_rcu_unlock; 326 } 327 328 err = -EPERM; 329 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW)) 330 goto out_rcu_unlock; 331 332 err = -EAFNOSUPPORT; 333 if (!inet_netns_ok(net, protocol)) 334 goto out_rcu_unlock; 335 336 sock->ops = answer->ops; 337 answer_prot = answer->prot; 338 answer_no_check = answer->no_check; 339 answer_flags = answer->flags; 340 rcu_read_unlock(); 341 342 WARN_ON(answer_prot->slab == NULL); 343 344 err = -ENOBUFS; 345 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot); 346 if (sk == NULL) 347 goto out; 348 349 err = 0; 350 sk->sk_no_check = answer_no_check; 351 if (INET_PROTOSW_REUSE & answer_flags) 352 sk->sk_reuse = 1; 353 354 inet = inet_sk(sk); 355 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 356 357 inet->nodefrag = 0; 358 359 if (SOCK_RAW == sock->type) { 360 inet->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->inet_id = 0; 371 372 sock_init_data(sock, sk); 373 374 sk->sk_destruct = inet_sock_destruct; 375 sk->sk_protocol = protocol; 376 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 377 378 inet->uc_ttl = -1; 379 inet->mc_loop = 1; 380 inet->mc_ttl = 1; 381 inet->mc_all = 1; 382 inet->mc_index = 0; 383 inet->mc_list = NULL; 384 385 sk_refcnt_debug_inc(sk); 386 387 if (inet->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->inet_sport = htons(inet->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 } 403out: 404 return err; 405out_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 */ 416int inet_release(struct socket *sock) 417{ 418 struct sock *sk = sock->sk; 419 420 if (sk) { 421 long timeout; 422 423 sock_rps_reset_flow(sk); 424 425 /* Applications forget to leave groups before exiting */ 426 ip_mc_drop_socket(sk); 427 428 /* If linger is set, we don't return until the close 429 * is complete. Otherwise we return immediately. The 430 * actually closing is done the same either way. 431 * 432 * If the close is due to the process exiting, we never 433 * linger.. 434 */ 435 timeout = 0; 436 if (sock_flag(sk, SOCK_LINGER) && 437 !(current->flags & PF_EXITING)) 438 timeout = sk->sk_lingertime; 439 sock->sk = NULL; 440 sk->sk_prot->close(sk, timeout); 441 } 442 return 0; 443} 444EXPORT_SYMBOL(inet_release); 445 446/* It is off by default, see below. */ 447int sysctl_ip_nonlocal_bind __read_mostly; 448EXPORT_SYMBOL(sysctl_ip_nonlocal_bind); 449 450int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 451{ 452 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 453 struct sock *sk = sock->sk; 454 struct inet_sock *inet = inet_sk(sk); 455 unsigned short snum; 456 int chk_addr_ret; 457 int err; 458 459 /* If the socket has its own bind function then use it. (RAW) */ 460 if (sk->sk_prot->bind) { 461 err = sk->sk_prot->bind(sk, uaddr, addr_len); 462 goto out; 463 } 464 err = -EINVAL; 465 if (addr_len < sizeof(struct sockaddr_in)) 466 goto out; 467 468 if (addr->sin_family != AF_INET) { 469 err = -EAFNOSUPPORT; 470 goto out; 471 } 472 473 chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr); 474 475 /* Not specified by any standard per-se, however it breaks too 476 * many applications when removed. It is unfortunate since 477 * allowing applications to make a non-local bind solves 478 * several problems with systems using dynamic addressing. 479 * (ie. your servers still start up even if your ISDN link 480 * is temporarily down) 481 */ 482 err = -EADDRNOTAVAIL; 483 if (!sysctl_ip_nonlocal_bind && 484 !(inet->freebind || inet->transparent) && 485 addr->sin_addr.s_addr != htonl(INADDR_ANY) && 486 chk_addr_ret != RTN_LOCAL && 487 chk_addr_ret != RTN_MULTICAST && 488 chk_addr_ret != RTN_BROADCAST) 489 goto out; 490 491 snum = ntohs(addr->sin_port); 492 err = -EACCES; 493 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) 494 goto out; 495 496 /* We keep a pair of addresses. rcv_saddr is the one 497 * used by hash lookups, and saddr is used for transmit. 498 * 499 * In the BSD API these are the same except where it 500 * would be illegal to use them (multicast/broadcast) in 501 * which case the sending device address is used. 502 */ 503 lock_sock(sk); 504 505 /* Check these errors (active socket, double bind). */ 506 err = -EINVAL; 507 if (sk->sk_state != TCP_CLOSE || inet->inet_num) 508 goto out_release_sock; 509 510 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 511 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 512 inet->inet_saddr = 0; /* Use device */ 513 514 /* Make sure we are allowed to bind here. */ 515 if (sk->sk_prot->get_port(sk, snum)) { 516 inet->inet_saddr = inet->inet_rcv_saddr = 0; 517 err = -EADDRINUSE; 518 goto out_release_sock; 519 } 520 521 if (inet->inet_rcv_saddr) 522 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 523 if (snum) 524 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 525 inet->inet_sport = htons(inet->inet_num); 526 inet->inet_daddr = 0; 527 inet->inet_dport = 0; 528 sk_dst_reset(sk); 529 err = 0; 530out_release_sock: 531 release_sock(sk); 532out: 533 return err; 534} 535EXPORT_SYMBOL(inet_bind); 536 537int inet_dgram_connect(struct socket *sock, struct sockaddr * uaddr, 538 int addr_len, int flags) 539{ 540 struct sock *sk = sock->sk; 541 542 if (addr_len < sizeof(uaddr->sa_family)) 543 return -EINVAL; 544 if (uaddr->sa_family == AF_UNSPEC) 545 return sk->sk_prot->disconnect(sk, flags); 546 547 if (!inet_sk(sk)->inet_num && inet_autobind(sk)) 548 return -EAGAIN; 549 return sk->sk_prot->connect(sk, (struct sockaddr *)uaddr, addr_len); 550} 551EXPORT_SYMBOL(inet_dgram_connect); 552 553static long inet_wait_for_connect(struct sock *sk, long timeo) 554{ 555 DEFINE_WAIT(wait); 556 557 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 558 559 /* Basic assumption: if someone sets sk->sk_err, he _must_ 560 * change state of the socket from TCP_SYN_*. 561 * Connect() does not allow to get error notifications 562 * without closing the socket. 563 */ 564 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 565 release_sock(sk); 566 timeo = schedule_timeout(timeo); 567 lock_sock(sk); 568 if (signal_pending(current) || !timeo) 569 break; 570 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 571 } 572 finish_wait(sk_sleep(sk), &wait); 573 return timeo; 574} 575 576/* 577 * Connect to a remote host. There is regrettably still a little 578 * TCP 'magic' in here. 579 */ 580int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 581 int addr_len, int flags) 582{ 583 struct sock *sk = sock->sk; 584 int err; 585 long timeo; 586 587 if (addr_len < sizeof(uaddr->sa_family)) 588 return -EINVAL; 589 590 lock_sock(sk); 591 592 if (uaddr->sa_family == AF_UNSPEC) { 593 err = sk->sk_prot->disconnect(sk, flags); 594 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 595 goto out; 596 } 597 598 switch (sock->state) { 599 default: 600 err = -EINVAL; 601 goto out; 602 case SS_CONNECTED: 603 err = -EISCONN; 604 goto out; 605 case SS_CONNECTING: 606 err = -EALREADY; 607 /* Fall out of switch with err, set for this state */ 608 break; 609 case SS_UNCONNECTED: 610 err = -EISCONN; 611 if (sk->sk_state != TCP_CLOSE) 612 goto out; 613 614 err = sk->sk_prot->connect(sk, uaddr, addr_len); 615 if (err < 0) 616 goto out; 617 618 sock->state = SS_CONNECTING; 619 620 /* Just entered SS_CONNECTING state; the only 621 * difference is that return value in non-blocking 622 * case is EINPROGRESS, rather than EALREADY. 623 */ 624 err = -EINPROGRESS; 625 break; 626 } 627 628 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 629 630 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 631 /* Error code is set above */ 632 if (!timeo || !inet_wait_for_connect(sk, timeo)) 633 goto out; 634 635 err = sock_intr_errno(timeo); 636 if (signal_pending(current)) 637 goto out; 638 } 639 640 /* Connection was closed by RST, timeout, ICMP error 641 * or another process disconnected us. 642 */ 643 if (sk->sk_state == TCP_CLOSE) 644 goto sock_error; 645 646 /* sk->sk_err may be not zero now, if RECVERR was ordered by user 647 * and error was received after socket entered established state. 648 * Hence, it is handled normally after connect() return successfully. 649 */ 650 651 sock->state = SS_CONNECTED; 652 err = 0; 653out: 654 release_sock(sk); 655 return err; 656 657sock_error: 658 err = sock_error(sk) ? : -ECONNABORTED; 659 sock->state = SS_UNCONNECTED; 660 if (sk->sk_prot->disconnect(sk, flags)) 661 sock->state = SS_DISCONNECTING; 662 goto out; 663} 664EXPORT_SYMBOL(inet_stream_connect); 665 666/* 667 * Accept a pending connection. The TCP layer now gives BSD semantics. 668 */ 669 670int inet_accept(struct socket *sock, struct socket *newsock, int flags) 671{ 672 struct sock *sk1 = sock->sk; 673 int err = -EINVAL; 674 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err); 675 676 if (!sk2) 677 goto do_err; 678 679 lock_sock(sk2); 680 681 sock_rps_record_flow(sk2); 682 WARN_ON(!((1 << sk2->sk_state) & 683 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE))); 684 685 sock_graft(sk2, newsock); 686 687 newsock->state = SS_CONNECTED; 688 err = 0; 689 release_sock(sk2); 690do_err: 691 return err; 692} 693EXPORT_SYMBOL(inet_accept); 694 695 696/* 697 * This does both peername and sockname. 698 */ 699int inet_getname(struct socket *sock, struct sockaddr *uaddr, 700 int *uaddr_len, int peer) 701{ 702 struct sock *sk = sock->sk; 703 struct inet_sock *inet = inet_sk(sk); 704 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr); 705 706 sin->sin_family = AF_INET; 707 if (peer) { 708 if (!inet->inet_dport || 709 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 710 peer == 1)) 711 return -ENOTCONN; 712 sin->sin_port = inet->inet_dport; 713 sin->sin_addr.s_addr = inet->inet_daddr; 714 } else { 715 __be32 addr = inet->inet_rcv_saddr; 716 if (!addr) 717 addr = inet->inet_saddr; 718 sin->sin_port = inet->inet_sport; 719 sin->sin_addr.s_addr = addr; 720 } 721 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 722 *uaddr_len = sizeof(*sin); 723 return 0; 724} 725EXPORT_SYMBOL(inet_getname); 726 727int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 728 size_t size) 729{ 730 struct sock *sk = sock->sk; 731 732 sock_rps_record_flow(sk); 733 734 /* We may need to bind the socket. */ 735 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 736 inet_autobind(sk)) 737 return -EAGAIN; 738 739 return sk->sk_prot->sendmsg(iocb, sk, msg, size); 740} 741EXPORT_SYMBOL(inet_sendmsg); 742 743ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, 744 size_t size, int flags) 745{ 746 struct sock *sk = sock->sk; 747 748 sock_rps_record_flow(sk); 749 750 /* We may need to bind the socket. */ 751 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 752 inet_autobind(sk)) 753 return -EAGAIN; 754 755 if (sk->sk_prot->sendpage) 756 return sk->sk_prot->sendpage(sk, page, offset, size, flags); 757 return sock_no_sendpage(sock, page, offset, size, flags); 758} 759EXPORT_SYMBOL(inet_sendpage); 760 761int inet_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 762 size_t size, int flags) 763{ 764 struct sock *sk = sock->sk; 765 int addr_len = 0; 766 int err; 767 768 sock_rps_record_flow(sk); 769 770 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, 771 flags & ~MSG_DONTWAIT, &addr_len); 772 if (err >= 0) 773 msg->msg_namelen = addr_len; 774 return err; 775} 776EXPORT_SYMBOL(inet_recvmsg); 777 778int inet_shutdown(struct socket *sock, int how) 779{ 780 struct sock *sk = sock->sk; 781 int err = 0; 782 783 /* This should really check to make sure 784 * the socket is a TCP socket. (WHY AC...) 785 */ 786 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and 787 1->2 bit 2 snds. 788 2->3 */ 789 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ 790 return -EINVAL; 791 792 lock_sock(sk); 793 if (sock->state == SS_CONNECTING) { 794 if ((1 << sk->sk_state) & 795 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) 796 sock->state = SS_DISCONNECTING; 797 else 798 sock->state = SS_CONNECTED; 799 } 800 801 switch (sk->sk_state) { 802 case TCP_CLOSE: 803 err = -ENOTCONN; 804 /* Hack to wake up other listeners, who can poll for 805 POLLHUP, even on eg. unconnected UDP sockets -- RR */ 806 default: 807 sk->sk_shutdown |= how; 808 if (sk->sk_prot->shutdown) 809 sk->sk_prot->shutdown(sk, how); 810 break; 811 812 /* Remaining two branches are temporary solution for missing 813 * close() in multithreaded environment. It is _not_ a good idea, 814 * but we have no choice until close() is repaired at VFS level. 815 */ 816 case TCP_LISTEN: 817 if (!(how & RCV_SHUTDOWN)) 818 break; 819 /* Fall through */ 820 case TCP_SYN_SENT: 821 err = sk->sk_prot->disconnect(sk, O_NONBLOCK); 822 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 823 break; 824 } 825 826 /* Wake up anyone sleeping in poll. */ 827 sk->sk_state_change(sk); 828 release_sock(sk); 829 return err; 830} 831EXPORT_SYMBOL(inet_shutdown); 832 833/* 834 * ioctl() calls you can issue on an INET socket. Most of these are 835 * device configuration and stuff and very rarely used. Some ioctls 836 * pass on to the socket itself. 837 * 838 * NOTE: I like the idea of a module for the config stuff. ie ifconfig 839 * loads the devconfigure module does its configuring and unloads it. 840 * There's a good 20K of config code hanging around the kernel. 841 */ 842 843int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 844{ 845 struct sock *sk = sock->sk; 846 int err = 0; 847 struct net *net = sock_net(sk); 848 849 switch (cmd) { 850 case SIOCGSTAMP: 851 err = sock_get_timestamp(sk, (struct timeval __user *)arg); 852 break; 853 case SIOCGSTAMPNS: 854 err = sock_get_timestampns(sk, (struct timespec __user *)arg); 855 break; 856 case SIOCADDRT: 857 case SIOCDELRT: 858 case SIOCRTMSG: 859 err = ip_rt_ioctl(net, cmd, (void __user *)arg); 860 break; 861 case SIOCDARP: 862 case SIOCGARP: 863 case SIOCSARP: 864 err = arp_ioctl(net, cmd, (void __user *)arg); 865 break; 866 case SIOCGIFADDR: 867 case SIOCSIFADDR: 868 case SIOCGIFBRDADDR: 869 case SIOCSIFBRDADDR: 870 case SIOCGIFNETMASK: 871 case SIOCSIFNETMASK: 872 case SIOCGIFDSTADDR: 873 case SIOCSIFDSTADDR: 874 case SIOCSIFPFLAGS: 875 case SIOCGIFPFLAGS: 876 case SIOCSIFFLAGS: 877 err = devinet_ioctl(net, cmd, (void __user *)arg); 878 break; 879 default: 880 if (sk->sk_prot->ioctl) 881 err = sk->sk_prot->ioctl(sk, cmd, arg); 882 else 883 err = -ENOIOCTLCMD; 884 break; 885 } 886 return err; 887} 888EXPORT_SYMBOL(inet_ioctl); 889 890#ifdef CONFIG_COMPAT 891int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 892{ 893 struct sock *sk = sock->sk; 894 int err = -ENOIOCTLCMD; 895 896 if (sk->sk_prot->compat_ioctl) 897 err = sk->sk_prot->compat_ioctl(sk, cmd, arg); 898 899 return err; 900} 901#endif 902 903const struct proto_ops inet_stream_ops = { 904 .family = PF_INET, 905 .owner = THIS_MODULE, 906 .release = inet_release, 907 .bind = inet_bind, 908 .connect = inet_stream_connect, 909 .socketpair = sock_no_socketpair, 910 .accept = inet_accept, 911 .getname = inet_getname, 912 .poll = tcp_poll, 913 .ioctl = inet_ioctl, 914 .listen = inet_listen, 915 .shutdown = inet_shutdown, 916 .setsockopt = sock_common_setsockopt, 917 .getsockopt = sock_common_getsockopt, 918 .sendmsg = inet_sendmsg, 919 .recvmsg = inet_recvmsg, 920 .mmap = sock_no_mmap, 921 .sendpage = inet_sendpage, 922 .splice_read = tcp_splice_read, 923#ifdef CONFIG_COMPAT 924 .compat_setsockopt = compat_sock_common_setsockopt, 925 .compat_getsockopt = compat_sock_common_getsockopt, 926 .compat_ioctl = inet_compat_ioctl, 927#endif 928}; 929EXPORT_SYMBOL(inet_stream_ops); 930 931const struct proto_ops inet_dgram_ops = { 932 .family = PF_INET, 933 .owner = THIS_MODULE, 934 .release = inet_release, 935 .bind = inet_bind, 936 .connect = inet_dgram_connect, 937 .socketpair = sock_no_socketpair, 938 .accept = sock_no_accept, 939 .getname = inet_getname, 940 .poll = udp_poll, 941 .ioctl = inet_ioctl, 942 .listen = sock_no_listen, 943 .shutdown = inet_shutdown, 944 .setsockopt = sock_common_setsockopt, 945 .getsockopt = sock_common_getsockopt, 946 .sendmsg = inet_sendmsg, 947 .recvmsg = inet_recvmsg, 948 .mmap = sock_no_mmap, 949 .sendpage = inet_sendpage, 950#ifdef CONFIG_COMPAT 951 .compat_setsockopt = compat_sock_common_setsockopt, 952 .compat_getsockopt = compat_sock_common_getsockopt, 953 .compat_ioctl = inet_compat_ioctl, 954#endif 955}; 956EXPORT_SYMBOL(inet_dgram_ops); 957 958/* 959 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 960 * udp_poll 961 */ 962static const struct proto_ops inet_sockraw_ops = { 963 .family = PF_INET, 964 .owner = THIS_MODULE, 965 .release = inet_release, 966 .bind = inet_bind, 967 .connect = inet_dgram_connect, 968 .socketpair = sock_no_socketpair, 969 .accept = sock_no_accept, 970 .getname = inet_getname, 971 .poll = datagram_poll, 972 .ioctl = inet_ioctl, 973 .listen = sock_no_listen, 974 .shutdown = inet_shutdown, 975 .setsockopt = sock_common_setsockopt, 976 .getsockopt = sock_common_getsockopt, 977 .sendmsg = inet_sendmsg, 978 .recvmsg = inet_recvmsg, 979 .mmap = sock_no_mmap, 980 .sendpage = inet_sendpage, 981#ifdef CONFIG_COMPAT 982 .compat_setsockopt = compat_sock_common_setsockopt, 983 .compat_getsockopt = compat_sock_common_getsockopt, 984 .compat_ioctl = inet_compat_ioctl, 985#endif 986}; 987 988static const struct net_proto_family inet_family_ops = { 989 .family = PF_INET, 990 .create = inet_create, 991 .owner = THIS_MODULE, 992}; 993 994/* Upon startup we insert all the elements in inetsw_array[] into 995 * the linked list inetsw. 996 */ 997static struct inet_protosw inetsw_array[] = 998{ 999 { 1000 .type = SOCK_STREAM, 1001 .protocol = IPPROTO_TCP, 1002 .prot = &tcp_prot, 1003 .ops = &inet_stream_ops, 1004 .no_check = 0, 1005 .flags = INET_PROTOSW_PERMANENT | 1006 INET_PROTOSW_ICSK, 1007 }, 1008 1009 { 1010 .type = SOCK_DGRAM, 1011 .protocol = IPPROTO_UDP, 1012 .prot = &udp_prot, 1013 .ops = &inet_dgram_ops, 1014 .no_check = UDP_CSUM_DEFAULT, 1015 .flags = INET_PROTOSW_PERMANENT, 1016 }, 1017 1018 { 1019 .type = SOCK_DGRAM, 1020 .protocol = IPPROTO_ICMP, 1021 .prot = &ping_prot, 1022 .ops = &inet_dgram_ops, 1023 .no_check = UDP_CSUM_DEFAULT, 1024 .flags = INET_PROTOSW_REUSE, 1025 }, 1026 1027 { 1028 .type = SOCK_RAW, 1029 .protocol = IPPROTO_IP, /* wild card */ 1030 .prot = &raw_prot, 1031 .ops = &inet_sockraw_ops, 1032 .no_check = UDP_CSUM_DEFAULT, 1033 .flags = INET_PROTOSW_REUSE, 1034 } 1035}; 1036 1037#define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) 1038 1039void inet_register_protosw(struct inet_protosw *p) 1040{ 1041 struct list_head *lh; 1042 struct inet_protosw *answer; 1043 int protocol = p->protocol; 1044 struct list_head *last_perm; 1045 1046 spin_lock_bh(&inetsw_lock); 1047 1048 if (p->type >= SOCK_MAX) 1049 goto out_illegal; 1050 1051 /* If we are trying to override a permanent protocol, bail. */ 1052 answer = NULL; 1053 last_perm = &inetsw[p->type]; 1054 list_for_each(lh, &inetsw[p->type]) { 1055 answer = list_entry(lh, struct inet_protosw, list); 1056 1057 /* Check only the non-wild match. */ 1058 if (INET_PROTOSW_PERMANENT & answer->flags) { 1059 if (protocol == answer->protocol) 1060 break; 1061 last_perm = lh; 1062 } 1063 1064 answer = NULL; 1065 } 1066 if (answer) 1067 goto out_permanent; 1068 1069 /* Add the new entry after the last permanent entry if any, so that 1070 * the new entry does not override a permanent entry when matched with 1071 * a wild-card protocol. But it is allowed to override any existing 1072 * non-permanent entry. This means that when we remove this entry, the 1073 * system automatically returns to the old behavior. 1074 */ 1075 list_add_rcu(&p->list, last_perm); 1076out: 1077 spin_unlock_bh(&inetsw_lock); 1078 1079 return; 1080 1081out_permanent: 1082 printk(KERN_ERR "Attempt to override permanent protocol %d.\n", 1083 protocol); 1084 goto out; 1085 1086out_illegal: 1087 printk(KERN_ERR 1088 "Ignoring attempt to register invalid socket type %d.\n", 1089 p->type); 1090 goto out; 1091} 1092EXPORT_SYMBOL(inet_register_protosw); 1093 1094void inet_unregister_protosw(struct inet_protosw *p) 1095{ 1096 if (INET_PROTOSW_PERMANENT & p->flags) { 1097 printk(KERN_ERR 1098 "Attempt to unregister permanent protocol %d.\n", 1099 p->protocol); 1100 } else { 1101 spin_lock_bh(&inetsw_lock); 1102 list_del_rcu(&p->list); 1103 spin_unlock_bh(&inetsw_lock); 1104 1105 synchronize_net(); 1106 } 1107} 1108EXPORT_SYMBOL(inet_unregister_protosw); 1109 1110/* 1111 * Shall we try to damage output packets if routing dev changes? 1112 */ 1113 1114int sysctl_ip_dynaddr __read_mostly; 1115 1116static int inet_sk_reselect_saddr(struct sock *sk) 1117{ 1118 struct inet_sock *inet = inet_sk(sk); 1119 __be32 old_saddr = inet->inet_saddr; 1120 __be32 daddr = inet->inet_daddr; 1121 struct flowi4 *fl4; 1122 struct rtable *rt; 1123 __be32 new_saddr; 1124 struct ip_options_rcu *inet_opt; 1125 1126 inet_opt = rcu_dereference_protected(inet->inet_opt, 1127 sock_owned_by_user(sk)); 1128 if (inet_opt && inet_opt->opt.srr) 1129 daddr = inet_opt->opt.faddr; 1130 1131 /* Query new route. */ 1132 fl4 = &inet->cork.fl.u.ip4; 1133 rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk), 1134 sk->sk_bound_dev_if, sk->sk_protocol, 1135 inet->inet_sport, inet->inet_dport, sk, false); 1136 if (IS_ERR(rt)) 1137 return PTR_ERR(rt); 1138 1139 sk_setup_caps(sk, &rt->dst); 1140 1141 new_saddr = fl4->saddr; 1142 1143 if (new_saddr == old_saddr) 1144 return 0; 1145 1146 if (sysctl_ip_dynaddr > 1) { 1147 printk(KERN_INFO "%s(): shifting inet->saddr from %pI4 to %pI4\n", 1148 __func__, &old_saddr, &new_saddr); 1149 } 1150 1151 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr; 1152 1153 /* 1154 * XXX The only one ugly spot where we need to 1155 * XXX really change the sockets identity after 1156 * XXX it has entered the hashes. -DaveM 1157 * 1158 * Besides that, it does not check for connection 1159 * uniqueness. Wait for troubles. 1160 */ 1161 __sk_prot_rehash(sk); 1162 return 0; 1163} 1164 1165int inet_sk_rebuild_header(struct sock *sk) 1166{ 1167 struct inet_sock *inet = inet_sk(sk); 1168 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); 1169 __be32 daddr; 1170 struct ip_options_rcu *inet_opt; 1171 struct flowi4 *fl4; 1172 int err; 1173 1174 /* Route is OK, nothing to do. */ 1175 if (rt) 1176 return 0; 1177 1178 /* Reroute. */ 1179 rcu_read_lock(); 1180 inet_opt = rcu_dereference(inet->inet_opt); 1181 daddr = inet->inet_daddr; 1182 if (inet_opt && inet_opt->opt.srr) 1183 daddr = inet_opt->opt.faddr; 1184 rcu_read_unlock(); 1185 fl4 = &inet->cork.fl.u.ip4; 1186 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr, 1187 inet->inet_dport, inet->inet_sport, 1188 sk->sk_protocol, RT_CONN_FLAGS(sk), 1189 sk->sk_bound_dev_if); 1190 if (!IS_ERR(rt)) { 1191 err = 0; 1192 sk_setup_caps(sk, &rt->dst); 1193 } else { 1194 err = PTR_ERR(rt); 1195 1196 /* Routing failed... */ 1197 sk->sk_route_caps = 0; 1198 /* 1199 * Other protocols have to map its equivalent state to TCP_SYN_SENT. 1200 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme 1201 */ 1202 if (!sysctl_ip_dynaddr || 1203 sk->sk_state != TCP_SYN_SENT || 1204 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 1205 (err = inet_sk_reselect_saddr(sk)) != 0) 1206 sk->sk_err_soft = -err; 1207 } 1208 1209 return err; 1210} 1211EXPORT_SYMBOL(inet_sk_rebuild_header); 1212 1213static int inet_gso_send_check(struct sk_buff *skb) 1214{ 1215 const struct iphdr *iph; 1216 const struct net_protocol *ops; 1217 int proto; 1218 int ihl; 1219 int err = -EINVAL; 1220 1221 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1222 goto out; 1223 1224 iph = ip_hdr(skb); 1225 ihl = iph->ihl * 4; 1226 if (ihl < sizeof(*iph)) 1227 goto out; 1228 1229 if (unlikely(!pskb_may_pull(skb, ihl))) 1230 goto out; 1231 1232 __skb_pull(skb, ihl); 1233 skb_reset_transport_header(skb); 1234 iph = ip_hdr(skb); 1235 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1236 err = -EPROTONOSUPPORT; 1237 1238 rcu_read_lock(); 1239 ops = rcu_dereference(inet_protos[proto]); 1240 if (likely(ops && ops->gso_send_check)) 1241 err = ops->gso_send_check(skb); 1242 rcu_read_unlock(); 1243 1244out: 1245 return err; 1246} 1247 1248static struct sk_buff *inet_gso_segment(struct sk_buff *skb, u32 features) 1249{ 1250 struct sk_buff *segs = ERR_PTR(-EINVAL); 1251 struct iphdr *iph; 1252 const struct net_protocol *ops; 1253 int proto; 1254 int ihl; 1255 int id; 1256 unsigned int offset = 0; 1257 1258 if (!(features & NETIF_F_V4_CSUM)) 1259 features &= ~NETIF_F_SG; 1260 1261 if (unlikely(skb_shinfo(skb)->gso_type & 1262 ~(SKB_GSO_TCPV4 | 1263 SKB_GSO_UDP | 1264 SKB_GSO_DODGY | 1265 SKB_GSO_TCP_ECN | 1266 0))) 1267 goto out; 1268 1269 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1270 goto out; 1271 1272 iph = ip_hdr(skb); 1273 ihl = iph->ihl * 4; 1274 if (ihl < sizeof(*iph)) 1275 goto out; 1276 1277 if (unlikely(!pskb_may_pull(skb, ihl))) 1278 goto out; 1279 1280 __skb_pull(skb, ihl); 1281 skb_reset_transport_header(skb); 1282 iph = ip_hdr(skb); 1283 id = ntohs(iph->id); 1284 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1285 segs = ERR_PTR(-EPROTONOSUPPORT); 1286 1287 rcu_read_lock(); 1288 ops = rcu_dereference(inet_protos[proto]); 1289 if (likely(ops && ops->gso_segment)) 1290 segs = ops->gso_segment(skb, features); 1291 rcu_read_unlock(); 1292 1293 if (!segs || IS_ERR(segs)) 1294 goto out; 1295 1296 skb = segs; 1297 do { 1298 iph = ip_hdr(skb); 1299 if (proto == IPPROTO_UDP) { 1300 iph->id = htons(id); 1301 iph->frag_off = htons(offset >> 3); 1302 if (skb->next != NULL) 1303 iph->frag_off |= htons(IP_MF); 1304 offset += (skb->len - skb->mac_len - iph->ihl * 4); 1305 } else 1306 iph->id = htons(id++); 1307 iph->tot_len = htons(skb->len - skb->mac_len); 1308 iph->check = 0; 1309 iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl); 1310 } while ((skb = skb->next)); 1311 1312out: 1313 return segs; 1314} 1315 1316static struct sk_buff **inet_gro_receive(struct sk_buff **head, 1317 struct sk_buff *skb) 1318{ 1319 const struct net_protocol *ops; 1320 struct sk_buff **pp = NULL; 1321 struct sk_buff *p; 1322 const struct iphdr *iph; 1323 unsigned int hlen; 1324 unsigned int off; 1325 unsigned int id; 1326 int flush = 1; 1327 int proto; 1328 1329 off = skb_gro_offset(skb); 1330 hlen = off + sizeof(*iph); 1331 iph = skb_gro_header_fast(skb, off); 1332 if (skb_gro_header_hard(skb, hlen)) { 1333 iph = skb_gro_header_slow(skb, hlen, off); 1334 if (unlikely(!iph)) 1335 goto out; 1336 } 1337 1338 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1339 1340 rcu_read_lock(); 1341 ops = rcu_dereference(inet_protos[proto]); 1342 if (!ops || !ops->gro_receive) 1343 goto out_unlock; 1344 1345 if (*(u8 *)iph != 0x45) 1346 goto out_unlock; 1347 1348 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) 1349 goto out_unlock; 1350 1351 id = ntohl(*(__be32 *)&iph->id); 1352 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id ^ IP_DF)); 1353 id >>= 16; 1354 1355 for (p = *head; p; p = p->next) { 1356 struct iphdr *iph2; 1357 1358 if (!NAPI_GRO_CB(p)->same_flow) 1359 continue; 1360 1361 iph2 = ip_hdr(p); 1362 1363 if ((iph->protocol ^ iph2->protocol) | 1364 (iph->tos ^ iph2->tos) | 1365 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) | 1366 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) { 1367 NAPI_GRO_CB(p)->same_flow = 0; 1368 continue; 1369 } 1370 1371 /* All fields must match except length and checksum. */ 1372 NAPI_GRO_CB(p)->flush |= 1373 (iph->ttl ^ iph2->ttl) | 1374 ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id); 1375 1376 NAPI_GRO_CB(p)->flush |= flush; 1377 } 1378 1379 NAPI_GRO_CB(skb)->flush |= flush; 1380 skb_gro_pull(skb, sizeof(*iph)); 1381 skb_set_transport_header(skb, skb_gro_offset(skb)); 1382 1383 pp = ops->gro_receive(head, skb); 1384 1385out_unlock: 1386 rcu_read_unlock(); 1387 1388out: 1389 NAPI_GRO_CB(skb)->flush |= flush; 1390 1391 return pp; 1392} 1393 1394static int inet_gro_complete(struct sk_buff *skb) 1395{ 1396 const struct net_protocol *ops; 1397 struct iphdr *iph = ip_hdr(skb); 1398 int proto = iph->protocol & (MAX_INET_PROTOS - 1); 1399 int err = -ENOSYS; 1400 __be16 newlen = htons(skb->len - skb_network_offset(skb)); 1401 1402 csum_replace2(&iph->check, iph->tot_len, newlen); 1403 iph->tot_len = newlen; 1404 1405 rcu_read_lock(); 1406 ops = rcu_dereference(inet_protos[proto]); 1407 if (WARN_ON(!ops || !ops->gro_complete)) 1408 goto out_unlock; 1409 1410 err = ops->gro_complete(skb); 1411 1412out_unlock: 1413 rcu_read_unlock(); 1414 1415 return err; 1416} 1417 1418int inet_ctl_sock_create(struct sock **sk, unsigned short family, 1419 unsigned short type, unsigned char protocol, 1420 struct net *net) 1421{ 1422 struct socket *sock; 1423 int rc = sock_create_kern(family, type, protocol, &sock); 1424 1425 if (rc == 0) { 1426 *sk = sock->sk; 1427 (*sk)->sk_allocation = GFP_ATOMIC; 1428 /* 1429 * Unhash it so that IP input processing does not even see it, 1430 * we do not wish this socket to see incoming packets. 1431 */ 1432 (*sk)->sk_prot->unhash(*sk); 1433 1434 sk_change_net(*sk, net); 1435 } 1436 return rc; 1437} 1438EXPORT_SYMBOL_GPL(inet_ctl_sock_create); 1439 1440unsigned long snmp_fold_field(void __percpu *mib[], int offt) 1441{ 1442 unsigned long res = 0; 1443 int i; 1444 1445 for_each_possible_cpu(i) { 1446 res += *(((unsigned long *) per_cpu_ptr(mib[0], i)) + offt); 1447 res += *(((unsigned long *) per_cpu_ptr(mib[1], i)) + offt); 1448 } 1449 return res; 1450} 1451EXPORT_SYMBOL_GPL(snmp_fold_field); 1452 1453#if BITS_PER_LONG==32 1454 1455u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t syncp_offset) 1456{ 1457 u64 res = 0; 1458 int cpu; 1459 1460 for_each_possible_cpu(cpu) { 1461 void *bhptr, *userptr; 1462 struct u64_stats_sync *syncp; 1463 u64 v_bh, v_user; 1464 unsigned int start; 1465 1466 /* first mib used by softirq context, we must use _bh() accessors */ 1467 bhptr = per_cpu_ptr(SNMP_STAT_BHPTR(mib), cpu); 1468 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset); 1469 do { 1470 start = u64_stats_fetch_begin_bh(syncp); 1471 v_bh = *(((u64 *) bhptr) + offt); 1472 } while (u64_stats_fetch_retry_bh(syncp, start)); 1473 1474 /* second mib used in USER context */ 1475 userptr = per_cpu_ptr(SNMP_STAT_USRPTR(mib), cpu); 1476 syncp = (struct u64_stats_sync *)(userptr + syncp_offset); 1477 do { 1478 start = u64_stats_fetch_begin(syncp); 1479 v_user = *(((u64 *) userptr) + offt); 1480 } while (u64_stats_fetch_retry(syncp, start)); 1481 1482 res += v_bh + v_user; 1483 } 1484 return res; 1485} 1486EXPORT_SYMBOL_GPL(snmp_fold_field64); 1487#endif 1488 1489int snmp_mib_init(void __percpu *ptr[2], size_t mibsize, size_t align) 1490{ 1491 BUG_ON(ptr == NULL); 1492 ptr[0] = __alloc_percpu(mibsize, align); 1493 if (!ptr[0]) 1494 goto err0; 1495 ptr[1] = __alloc_percpu(mibsize, align); 1496 if (!ptr[1]) 1497 goto err1; 1498 return 0; 1499err1: 1500 free_percpu(ptr[0]); 1501 ptr[0] = NULL; 1502err0: 1503 return -ENOMEM; 1504} 1505EXPORT_SYMBOL_GPL(snmp_mib_init); 1506 1507void snmp_mib_free(void __percpu *ptr[2]) 1508{ 1509 BUG_ON(ptr == NULL); 1510 free_percpu(ptr[0]); 1511 free_percpu(ptr[1]); 1512 ptr[0] = ptr[1] = NULL; 1513} 1514EXPORT_SYMBOL_GPL(snmp_mib_free); 1515 1516#ifdef CONFIG_IP_MULTICAST 1517static const struct net_protocol igmp_protocol = { 1518 .handler = igmp_rcv, 1519 .netns_ok = 1, 1520}; 1521#endif 1522 1523static const struct net_protocol tcp_protocol = { 1524 .handler = tcp_v4_rcv, 1525 .err_handler = tcp_v4_err, 1526 .gso_send_check = tcp_v4_gso_send_check, 1527 .gso_segment = tcp_tso_segment, 1528 .gro_receive = tcp4_gro_receive, 1529 .gro_complete = tcp4_gro_complete, 1530 .no_policy = 1, 1531 .netns_ok = 1, 1532}; 1533 1534static const struct net_protocol udp_protocol = { 1535 .handler = udp_rcv, 1536 .err_handler = udp_err, 1537 .gso_send_check = udp4_ufo_send_check, 1538 .gso_segment = udp4_ufo_fragment, 1539 .no_policy = 1, 1540 .netns_ok = 1, 1541}; 1542 1543static const struct net_protocol icmp_protocol = { 1544 .handler = icmp_rcv, 1545 .err_handler = ping_err, 1546 .no_policy = 1, 1547 .netns_ok = 1, 1548}; 1549 1550static __net_init int ipv4_mib_init_net(struct net *net) 1551{ 1552 if (snmp_mib_init((void __percpu **)net->mib.tcp_statistics, 1553 sizeof(struct tcp_mib), 1554 __alignof__(struct tcp_mib)) < 0) 1555 goto err_tcp_mib; 1556 if (snmp_mib_init((void __percpu **)net->mib.ip_statistics, 1557 sizeof(struct ipstats_mib), 1558 __alignof__(struct ipstats_mib)) < 0) 1559 goto err_ip_mib; 1560 if (snmp_mib_init((void __percpu **)net->mib.net_statistics, 1561 sizeof(struct linux_mib), 1562 __alignof__(struct linux_mib)) < 0) 1563 goto err_net_mib; 1564 if (snmp_mib_init((void __percpu **)net->mib.udp_statistics, 1565 sizeof(struct udp_mib), 1566 __alignof__(struct udp_mib)) < 0) 1567 goto err_udp_mib; 1568 if (snmp_mib_init((void __percpu **)net->mib.udplite_statistics, 1569 sizeof(struct udp_mib), 1570 __alignof__(struct udp_mib)) < 0) 1571 goto err_udplite_mib; 1572 if (snmp_mib_init((void __percpu **)net->mib.icmp_statistics, 1573 sizeof(struct icmp_mib), 1574 __alignof__(struct icmp_mib)) < 0) 1575 goto err_icmp_mib; 1576 if (snmp_mib_init((void __percpu **)net->mib.icmpmsg_statistics, 1577 sizeof(struct icmpmsg_mib), 1578 __alignof__(struct icmpmsg_mib)) < 0) 1579 goto err_icmpmsg_mib; 1580 1581 tcp_mib_init(net); 1582 return 0; 1583 1584err_icmpmsg_mib: 1585 snmp_mib_free((void __percpu **)net->mib.icmp_statistics); 1586err_icmp_mib: 1587 snmp_mib_free((void __percpu **)net->mib.udplite_statistics); 1588err_udplite_mib: 1589 snmp_mib_free((void __percpu **)net->mib.udp_statistics); 1590err_udp_mib: 1591 snmp_mib_free((void __percpu **)net->mib.net_statistics); 1592err_net_mib: 1593 snmp_mib_free((void __percpu **)net->mib.ip_statistics); 1594err_ip_mib: 1595 snmp_mib_free((void __percpu **)net->mib.tcp_statistics); 1596err_tcp_mib: 1597 return -ENOMEM; 1598} 1599 1600static __net_exit void ipv4_mib_exit_net(struct net *net) 1601{ 1602 snmp_mib_free((void __percpu **)net->mib.icmpmsg_statistics); 1603 snmp_mib_free((void __percpu **)net->mib.icmp_statistics); 1604 snmp_mib_free((void __percpu **)net->mib.udplite_statistics); 1605 snmp_mib_free((void __percpu **)net->mib.udp_statistics); 1606 snmp_mib_free((void __percpu **)net->mib.net_statistics); 1607 snmp_mib_free((void __percpu **)net->mib.ip_statistics); 1608 snmp_mib_free((void __percpu **)net->mib.tcp_statistics); 1609} 1610 1611static __net_initdata struct pernet_operations ipv4_mib_ops = { 1612 .init = ipv4_mib_init_net, 1613 .exit = ipv4_mib_exit_net, 1614}; 1615 1616static int __init init_ipv4_mibs(void) 1617{ 1618 return register_pernet_subsys(&ipv4_mib_ops); 1619} 1620 1621static int ipv4_proc_init(void); 1622 1623/* 1624 * IP protocol layer initialiser 1625 */ 1626 1627static struct packet_type ip_packet_type __read_mostly = { 1628 .type = cpu_to_be16(ETH_P_IP), 1629 .func = ip_rcv, 1630 .gso_send_check = inet_gso_send_check, 1631 .gso_segment = inet_gso_segment, 1632 .gro_receive = inet_gro_receive, 1633 .gro_complete = inet_gro_complete, 1634}; 1635 1636static int __init inet_init(void) 1637{ 1638 struct sk_buff *dummy_skb; 1639 struct inet_protosw *q; 1640 struct list_head *r; 1641 int rc = -EINVAL; 1642 1643 BUILD_BUG_ON(sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb)); 1644 1645 sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL); 1646 if (!sysctl_local_reserved_ports) 1647 goto out; 1648 1649 rc = proto_register(&tcp_prot, 1); 1650 if (rc) 1651 goto out_free_reserved_ports; 1652 1653 rc = proto_register(&udp_prot, 1); 1654 if (rc) 1655 goto out_unregister_tcp_proto; 1656 1657 rc = proto_register(&raw_prot, 1); 1658 if (rc) 1659 goto out_unregister_udp_proto; 1660 1661 rc = proto_register(&ping_prot, 1); 1662 if (rc) 1663 goto out_unregister_raw_proto; 1664 1665 /* 1666 * Tell SOCKET that we are alive... 1667 */ 1668 1669 (void)sock_register(&inet_family_ops); 1670 1671#ifdef CONFIG_SYSCTL 1672 ip_static_sysctl_init(); 1673#endif 1674 1675 /* 1676 * Add all the base protocols. 1677 */ 1678 1679 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 1680 printk(KERN_CRIT "inet_init: Cannot add ICMP protocol\n"); 1681 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) 1682 printk(KERN_CRIT "inet_init: Cannot add UDP protocol\n"); 1683 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) 1684 printk(KERN_CRIT "inet_init: Cannot add TCP protocol\n"); 1685#ifdef CONFIG_IP_MULTICAST 1686 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 1687 printk(KERN_CRIT "inet_init: Cannot add IGMP protocol\n"); 1688#endif 1689 1690 /* Register the socket-side information for inet_create. */ 1691 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 1692 INIT_LIST_HEAD(r); 1693 1694 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 1695 inet_register_protosw(q); 1696 1697 /* 1698 * Set the ARP module up 1699 */ 1700 1701 arp_init(); 1702 1703 /* 1704 * Set the IP module up 1705 */ 1706 1707 ip_init(); 1708 1709 tcp_v4_init(); 1710 1711 /* Setup TCP slab cache for open requests. */ 1712 tcp_init(); 1713 1714 /* Setup UDP memory threshold */ 1715 udp_init(); 1716 1717 /* Add UDP-Lite (RFC 3828) */ 1718 udplite4_register(); 1719 1720 ping_init(); 1721 1722 /* 1723 * Set the ICMP layer up 1724 */ 1725 1726 if (icmp_init() < 0) 1727 panic("Failed to create the ICMP control socket.\n"); 1728 1729 /* 1730 * Initialise the multicast router 1731 */ 1732#if defined(CONFIG_IP_MROUTE) 1733 if (ip_mr_init()) 1734 printk(KERN_CRIT "inet_init: Cannot init ipv4 mroute\n"); 1735#endif 1736 /* 1737 * Initialise per-cpu ipv4 mibs 1738 */ 1739 1740 if (init_ipv4_mibs()) 1741 printk(KERN_CRIT "inet_init: Cannot init ipv4 mibs\n"); 1742 1743 ipv4_proc_init(); 1744 1745 ipfrag_init(); 1746 1747 dev_add_pack(&ip_packet_type); 1748 1749 rc = 0; 1750out: 1751 return rc; 1752out_unregister_raw_proto: 1753 proto_unregister(&raw_prot); 1754out_unregister_udp_proto: 1755 proto_unregister(&udp_prot); 1756out_unregister_tcp_proto: 1757 proto_unregister(&tcp_prot); 1758out_free_reserved_ports: 1759 kfree(sysctl_local_reserved_ports); 1760 goto out; 1761} 1762 1763fs_initcall(inet_init); 1764 1765/* ------------------------------------------------------------------------ */ 1766 1767#ifdef CONFIG_PROC_FS 1768static int __init ipv4_proc_init(void) 1769{ 1770 int rc = 0; 1771 1772 if (raw_proc_init()) 1773 goto out_raw; 1774 if (tcp4_proc_init()) 1775 goto out_tcp; 1776 if (udp4_proc_init()) 1777 goto out_udp; 1778 if (ping_proc_init()) 1779 goto out_ping; 1780 if (ip_misc_proc_init()) 1781 goto out_misc; 1782out: 1783 return rc; 1784out_misc: 1785 ping_proc_exit(); 1786out_ping: 1787 udp4_proc_exit(); 1788out_udp: 1789 tcp4_proc_exit(); 1790out_tcp: 1791 raw_proc_exit(); 1792out_raw: 1793 rc = -ENOMEM; 1794 goto out; 1795} 1796 1797#else /* CONFIG_PROC_FS */ 1798static int __init ipv4_proc_init(void) 1799{ 1800 return 0; 1801} 1802#endif /* CONFIG_PROC_FS */ 1803 1804MODULE_ALIAS_NETPROTO(PF_INET); 1805 1806