af_inet.c revision 4ce3c183fcade7f4b30a33dae90cd774c3d9e094
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 <linux/skbuff.h> 109#include <net/sock.h> 110#include <net/raw.h> 111#include <net/icmp.h> 112#include <net/ipip.h> 113#include <net/inet_common.h> 114#include <net/xfrm.h> 115#include <net/net_namespace.h> 116#ifdef CONFIG_IP_MROUTE 117#include <linux/mroute.h> 118#endif 119 120 121/* The inetsw table contains everything that inet_create needs to 122 * build a new socket. 123 */ 124static struct list_head inetsw[SOCK_MAX]; 125static DEFINE_SPINLOCK(inetsw_lock); 126 127struct ipv4_config ipv4_config; 128EXPORT_SYMBOL(ipv4_config); 129 130/* New destruction routine */ 131 132void inet_sock_destruct(struct sock *sk) 133{ 134 struct inet_sock *inet = inet_sk(sk); 135 136 __skb_queue_purge(&sk->sk_receive_queue); 137 __skb_queue_purge(&sk->sk_error_queue); 138 139 sk_mem_reclaim(sk); 140 141 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) { 142 pr_err("Attempt to release TCP socket in state %d %p\n", 143 sk->sk_state, sk); 144 return; 145 } 146 if (!sock_flag(sk, SOCK_DEAD)) { 147 pr_err("Attempt to release alive inet socket %p\n", sk); 148 return; 149 } 150 151 WARN_ON(atomic_read(&sk->sk_rmem_alloc)); 152 WARN_ON(atomic_read(&sk->sk_wmem_alloc)); 153 WARN_ON(sk->sk_wmem_queued); 154 WARN_ON(sk->sk_forward_alloc); 155 156 kfree(inet->opt); 157 dst_release(rcu_dereference_check(sk->sk_dst_cache, 1)); 158 sk_refcnt_debug_dec(sk); 159} 160EXPORT_SYMBOL(inet_sock_destruct); 161 162/* 163 * The routines beyond this point handle the behaviour of an AF_INET 164 * socket object. Mostly it punts to the subprotocols of IP to do 165 * the work. 166 */ 167 168/* 169 * Automatically bind an unbound socket. 170 */ 171 172static int inet_autobind(struct sock *sk) 173{ 174 struct inet_sock *inet; 175 /* We may need to bind the socket. */ 176 lock_sock(sk); 177 inet = inet_sk(sk); 178 if (!inet->inet_num) { 179 if (sk->sk_prot->get_port(sk, 0)) { 180 release_sock(sk); 181 return -EAGAIN; 182 } 183 inet->inet_sport = htons(inet->inet_num); 184 } 185 release_sock(sk); 186 return 0; 187} 188 189/* 190 * Move a socket into listening state. 191 */ 192int inet_listen(struct socket *sock, int backlog) 193{ 194 struct sock *sk = sock->sk; 195 unsigned char old_state; 196 int err; 197 198 lock_sock(sk); 199 200 err = -EINVAL; 201 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM) 202 goto out; 203 204 old_state = sk->sk_state; 205 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN))) 206 goto out; 207 208 /* Really, if the socket is already in listen state 209 * we can only allow the backlog to be adjusted. 210 */ 211 if (old_state != TCP_LISTEN) { 212 err = inet_csk_listen_start(sk, backlog); 213 if (err) 214 goto out; 215 } 216 sk->sk_max_ack_backlog = backlog; 217 err = 0; 218 219out: 220 release_sock(sk); 221 return err; 222} 223EXPORT_SYMBOL(inet_listen); 224 225u32 inet_ehash_secret __read_mostly; 226EXPORT_SYMBOL(inet_ehash_secret); 227 228/* 229 * inet_ehash_secret must be set exactly once 230 * Instead of using a dedicated spinlock, we (ab)use inetsw_lock 231 */ 232void build_ehash_secret(void) 233{ 234 u32 rnd; 235 do { 236 get_random_bytes(&rnd, sizeof(rnd)); 237 } while (rnd == 0); 238 spin_lock_bh(&inetsw_lock); 239 if (!inet_ehash_secret) 240 inet_ehash_secret = rnd; 241 spin_unlock_bh(&inetsw_lock); 242} 243EXPORT_SYMBOL(build_ehash_secret); 244 245static inline int inet_netns_ok(struct net *net, int protocol) 246{ 247 int hash; 248 const struct net_protocol *ipprot; 249 250 if (net_eq(net, &init_net)) 251 return 1; 252 253 hash = protocol & (MAX_INET_PROTOS - 1); 254 ipprot = rcu_dereference(inet_protos[hash]); 255 256 if (ipprot == NULL) 257 /* raw IP is OK */ 258 return 1; 259 return ipprot->netns_ok; 260} 261 262/* 263 * Create an inet socket. 264 */ 265 266static int inet_create(struct net *net, struct socket *sock, int protocol, 267 int kern) 268{ 269 struct sock *sk; 270 struct inet_protosw *answer; 271 struct inet_sock *inet; 272 struct proto *answer_prot; 273 unsigned char answer_flags; 274 char answer_no_check; 275 int try_loading_module = 0; 276 int err; 277 278 if (unlikely(!inet_ehash_secret)) 279 if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM) 280 build_ehash_secret(); 281 282 sock->state = SS_UNCONNECTED; 283 284 /* Look for the requested type/protocol pair. */ 285lookup_protocol: 286 err = -ESOCKTNOSUPPORT; 287 rcu_read_lock(); 288 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) { 289 290 err = 0; 291 /* Check the non-wild match. */ 292 if (protocol == answer->protocol) { 293 if (protocol != IPPROTO_IP) 294 break; 295 } else { 296 /* Check for the two wild cases. */ 297 if (IPPROTO_IP == protocol) { 298 protocol = answer->protocol; 299 break; 300 } 301 if (IPPROTO_IP == answer->protocol) 302 break; 303 } 304 err = -EPROTONOSUPPORT; 305 } 306 307 if (unlikely(err)) { 308 if (try_loading_module < 2) { 309 rcu_read_unlock(); 310 /* 311 * Be more specific, e.g. net-pf-2-proto-132-type-1 312 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) 313 */ 314 if (++try_loading_module == 1) 315 request_module("net-pf-%d-proto-%d-type-%d", 316 PF_INET, protocol, sock->type); 317 /* 318 * Fall back to generic, e.g. net-pf-2-proto-132 319 * (net-pf-PF_INET-proto-IPPROTO_SCTP) 320 */ 321 else 322 request_module("net-pf-%d-proto-%d", 323 PF_INET, protocol); 324 goto lookup_protocol; 325 } else 326 goto out_rcu_unlock; 327 } 328 329 err = -EPERM; 330 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW)) 331 goto out_rcu_unlock; 332 333 err = -EAFNOSUPPORT; 334 if (!inet_netns_ok(net, protocol)) 335 goto out_rcu_unlock; 336 337 sock->ops = answer->ops; 338 answer_prot = answer->prot; 339 answer_no_check = answer->no_check; 340 answer_flags = answer->flags; 341 rcu_read_unlock(); 342 343 WARN_ON(answer_prot->slab == NULL); 344 345 err = -ENOBUFS; 346 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot); 347 if (sk == NULL) 348 goto out; 349 350 err = 0; 351 sk->sk_no_check = answer_no_check; 352 if (INET_PROTOSW_REUSE & answer_flags) 353 sk->sk_reuse = 1; 354 355 inet = inet_sk(sk); 356 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 357 358 inet->nodefrag = 0; 359 360 if (SOCK_RAW == sock->type) { 361 inet->inet_num = protocol; 362 if (IPPROTO_RAW == protocol) 363 inet->hdrincl = 1; 364 } 365 366 if (ipv4_config.no_pmtu_disc) 367 inet->pmtudisc = IP_PMTUDISC_DONT; 368 else 369 inet->pmtudisc = IP_PMTUDISC_WANT; 370 371 inet->inet_id = 0; 372 373 sock_init_data(sock, sk); 374 375 sk->sk_destruct = inet_sock_destruct; 376 sk->sk_protocol = protocol; 377 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 378 379 inet->uc_ttl = -1; 380 inet->mc_loop = 1; 381 inet->mc_ttl = 1; 382 inet->mc_all = 1; 383 inet->mc_index = 0; 384 inet->mc_list = NULL; 385 386 sk_refcnt_debug_inc(sk); 387 388 if (inet->inet_num) { 389 /* It assumes that any protocol which allows 390 * the user to assign a number at socket 391 * creation time automatically 392 * shares. 393 */ 394 inet->inet_sport = htons(inet->inet_num); 395 /* Add to protocol hash chains. */ 396 sk->sk_prot->hash(sk); 397 } 398 399 if (sk->sk_prot->init) { 400 err = sk->sk_prot->init(sk); 401 if (err) 402 sk_common_release(sk); 403 } 404out: 405 return err; 406out_rcu_unlock: 407 rcu_read_unlock(); 408 goto out; 409} 410 411 412/* 413 * The peer socket should always be NULL (or else). When we call this 414 * function we are destroying the object and from then on nobody 415 * should refer to it. 416 */ 417int inet_release(struct socket *sock) 418{ 419 struct sock *sk = sock->sk; 420 421 if (sk) { 422 long timeout; 423 424 sock_rps_reset_flow(sk); 425 426 /* Applications forget to leave groups before exiting */ 427 ip_mc_drop_socket(sk); 428 429 /* If linger is set, we don't return until the close 430 * is complete. Otherwise we return immediately. The 431 * actually closing is done the same either way. 432 * 433 * If the close is due to the process exiting, we never 434 * linger.. 435 */ 436 timeout = 0; 437 if (sock_flag(sk, SOCK_LINGER) && 438 !(current->flags & PF_EXITING)) 439 timeout = sk->sk_lingertime; 440 sock->sk = NULL; 441 sk->sk_prot->close(sk, timeout); 442 } 443 return 0; 444} 445EXPORT_SYMBOL(inet_release); 446 447/* It is off by default, see below. */ 448int sysctl_ip_nonlocal_bind __read_mostly; 449EXPORT_SYMBOL(sysctl_ip_nonlocal_bind); 450 451int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 452{ 453 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 454 struct sock *sk = sock->sk; 455 struct inet_sock *inet = inet_sk(sk); 456 unsigned short snum; 457 int chk_addr_ret; 458 int err; 459 460 /* If the socket has its own bind function then use it. (RAW) */ 461 if (sk->sk_prot->bind) { 462 err = sk->sk_prot->bind(sk, uaddr, addr_len); 463 goto out; 464 } 465 err = -EINVAL; 466 if (addr_len < sizeof(struct sockaddr_in)) 467 goto out; 468 469 chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr); 470 471 /* Not specified by any standard per-se, however it breaks too 472 * many applications when removed. It is unfortunate since 473 * allowing applications to make a non-local bind solves 474 * several problems with systems using dynamic addressing. 475 * (ie. your servers still start up even if your ISDN link 476 * is temporarily down) 477 */ 478 err = -EADDRNOTAVAIL; 479 if (!sysctl_ip_nonlocal_bind && 480 !(inet->freebind || inet->transparent) && 481 addr->sin_addr.s_addr != htonl(INADDR_ANY) && 482 chk_addr_ret != RTN_LOCAL && 483 chk_addr_ret != RTN_MULTICAST && 484 chk_addr_ret != RTN_BROADCAST) 485 goto out; 486 487 snum = ntohs(addr->sin_port); 488 err = -EACCES; 489 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) 490 goto out; 491 492 /* We keep a pair of addresses. rcv_saddr is the one 493 * used by hash lookups, and saddr is used for transmit. 494 * 495 * In the BSD API these are the same except where it 496 * would be illegal to use them (multicast/broadcast) in 497 * which case the sending device address is used. 498 */ 499 lock_sock(sk); 500 501 /* Check these errors (active socket, double bind). */ 502 err = -EINVAL; 503 if (sk->sk_state != TCP_CLOSE || inet->inet_num) 504 goto out_release_sock; 505 506 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 507 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 508 inet->inet_saddr = 0; /* Use device */ 509 510 /* Make sure we are allowed to bind here. */ 511 if (sk->sk_prot->get_port(sk, snum)) { 512 inet->inet_saddr = inet->inet_rcv_saddr = 0; 513 err = -EADDRINUSE; 514 goto out_release_sock; 515 } 516 517 if (inet->inet_rcv_saddr) 518 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 519 if (snum) 520 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 521 inet->inet_sport = htons(inet->inet_num); 522 inet->inet_daddr = 0; 523 inet->inet_dport = 0; 524 sk_dst_reset(sk); 525 err = 0; 526out_release_sock: 527 release_sock(sk); 528out: 529 return err; 530} 531EXPORT_SYMBOL(inet_bind); 532 533int inet_dgram_connect(struct socket *sock, struct sockaddr * uaddr, 534 int addr_len, int flags) 535{ 536 struct sock *sk = sock->sk; 537 538 if (addr_len < sizeof(uaddr->sa_family)) 539 return -EINVAL; 540 if (uaddr->sa_family == AF_UNSPEC) 541 return sk->sk_prot->disconnect(sk, flags); 542 543 if (!inet_sk(sk)->inet_num && inet_autobind(sk)) 544 return -EAGAIN; 545 return sk->sk_prot->connect(sk, (struct sockaddr *)uaddr, addr_len); 546} 547EXPORT_SYMBOL(inet_dgram_connect); 548 549static long inet_wait_for_connect(struct sock *sk, long timeo) 550{ 551 DEFINE_WAIT(wait); 552 553 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 554 555 /* Basic assumption: if someone sets sk->sk_err, he _must_ 556 * change state of the socket from TCP_SYN_*. 557 * Connect() does not allow to get error notifications 558 * without closing the socket. 559 */ 560 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 561 release_sock(sk); 562 timeo = schedule_timeout(timeo); 563 lock_sock(sk); 564 if (signal_pending(current) || !timeo) 565 break; 566 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 567 } 568 finish_wait(sk_sleep(sk), &wait); 569 return timeo; 570} 571 572/* 573 * Connect to a remote host. There is regrettably still a little 574 * TCP 'magic' in here. 575 */ 576int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 577 int addr_len, int flags) 578{ 579 struct sock *sk = sock->sk; 580 int err; 581 long timeo; 582 583 if (addr_len < sizeof(uaddr->sa_family)) 584 return -EINVAL; 585 586 lock_sock(sk); 587 588 if (uaddr->sa_family == AF_UNSPEC) { 589 err = sk->sk_prot->disconnect(sk, flags); 590 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 591 goto out; 592 } 593 594 switch (sock->state) { 595 default: 596 err = -EINVAL; 597 goto out; 598 case SS_CONNECTED: 599 err = -EISCONN; 600 goto out; 601 case SS_CONNECTING: 602 err = -EALREADY; 603 /* Fall out of switch with err, set for this state */ 604 break; 605 case SS_UNCONNECTED: 606 err = -EISCONN; 607 if (sk->sk_state != TCP_CLOSE) 608 goto out; 609 610 err = sk->sk_prot->connect(sk, uaddr, addr_len); 611 if (err < 0) 612 goto out; 613 614 sock->state = SS_CONNECTING; 615 616 /* Just entered SS_CONNECTING state; the only 617 * difference is that return value in non-blocking 618 * case is EINPROGRESS, rather than EALREADY. 619 */ 620 err = -EINPROGRESS; 621 break; 622 } 623 624 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 625 626 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 627 /* Error code is set above */ 628 if (!timeo || !inet_wait_for_connect(sk, timeo)) 629 goto out; 630 631 err = sock_intr_errno(timeo); 632 if (signal_pending(current)) 633 goto out; 634 } 635 636 /* Connection was closed by RST, timeout, ICMP error 637 * or another process disconnected us. 638 */ 639 if (sk->sk_state == TCP_CLOSE) 640 goto sock_error; 641 642 /* sk->sk_err may be not zero now, if RECVERR was ordered by user 643 * and error was received after socket entered established state. 644 * Hence, it is handled normally after connect() return successfully. 645 */ 646 647 sock->state = SS_CONNECTED; 648 err = 0; 649out: 650 release_sock(sk); 651 return err; 652 653sock_error: 654 err = sock_error(sk) ? : -ECONNABORTED; 655 sock->state = SS_UNCONNECTED; 656 if (sk->sk_prot->disconnect(sk, flags)) 657 sock->state = SS_DISCONNECTING; 658 goto out; 659} 660EXPORT_SYMBOL(inet_stream_connect); 661 662/* 663 * Accept a pending connection. The TCP layer now gives BSD semantics. 664 */ 665 666int inet_accept(struct socket *sock, struct socket *newsock, int flags) 667{ 668 struct sock *sk1 = sock->sk; 669 int err = -EINVAL; 670 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err); 671 672 if (!sk2) 673 goto do_err; 674 675 lock_sock(sk2); 676 677 WARN_ON(!((1 << sk2->sk_state) & 678 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE))); 679 680 sock_graft(sk2, newsock); 681 682 newsock->state = SS_CONNECTED; 683 err = 0; 684 release_sock(sk2); 685do_err: 686 return err; 687} 688EXPORT_SYMBOL(inet_accept); 689 690 691/* 692 * This does both peername and sockname. 693 */ 694int inet_getname(struct socket *sock, struct sockaddr *uaddr, 695 int *uaddr_len, int peer) 696{ 697 struct sock *sk = sock->sk; 698 struct inet_sock *inet = inet_sk(sk); 699 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr); 700 701 sin->sin_family = AF_INET; 702 if (peer) { 703 if (!inet->inet_dport || 704 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 705 peer == 1)) 706 return -ENOTCONN; 707 sin->sin_port = inet->inet_dport; 708 sin->sin_addr.s_addr = inet->inet_daddr; 709 } else { 710 __be32 addr = inet->inet_rcv_saddr; 711 if (!addr) 712 addr = inet->inet_saddr; 713 sin->sin_port = inet->inet_sport; 714 sin->sin_addr.s_addr = addr; 715 } 716 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 717 *uaddr_len = sizeof(*sin); 718 return 0; 719} 720EXPORT_SYMBOL(inet_getname); 721 722int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 723 size_t size) 724{ 725 struct sock *sk = sock->sk; 726 727 sock_rps_record_flow(sk); 728 729 /* We may need to bind the socket. */ 730 if (!inet_sk(sk)->inet_num && inet_autobind(sk)) 731 return -EAGAIN; 732 733 return sk->sk_prot->sendmsg(iocb, sk, msg, size); 734} 735EXPORT_SYMBOL(inet_sendmsg); 736 737static ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, 738 size_t size, int flags) 739{ 740 struct sock *sk = sock->sk; 741 742 sock_rps_record_flow(sk); 743 744 /* We may need to bind the socket. */ 745 if (!inet_sk(sk)->inet_num && inet_autobind(sk)) 746 return -EAGAIN; 747 748 if (sk->sk_prot->sendpage) 749 return sk->sk_prot->sendpage(sk, page, offset, size, flags); 750 return sock_no_sendpage(sock, page, offset, size, flags); 751} 752 753int inet_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 754 size_t size, int flags) 755{ 756 struct sock *sk = sock->sk; 757 int addr_len = 0; 758 int err; 759 760 sock_rps_record_flow(sk); 761 762 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, 763 flags & ~MSG_DONTWAIT, &addr_len); 764 if (err >= 0) 765 msg->msg_namelen = addr_len; 766 return err; 767} 768EXPORT_SYMBOL(inet_recvmsg); 769 770int inet_shutdown(struct socket *sock, int how) 771{ 772 struct sock *sk = sock->sk; 773 int err = 0; 774 775 /* This should really check to make sure 776 * the socket is a TCP socket. (WHY AC...) 777 */ 778 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and 779 1->2 bit 2 snds. 780 2->3 */ 781 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ 782 return -EINVAL; 783 784 lock_sock(sk); 785 if (sock->state == SS_CONNECTING) { 786 if ((1 << sk->sk_state) & 787 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) 788 sock->state = SS_DISCONNECTING; 789 else 790 sock->state = SS_CONNECTED; 791 } 792 793 switch (sk->sk_state) { 794 case TCP_CLOSE: 795 err = -ENOTCONN; 796 /* Hack to wake up other listeners, who can poll for 797 POLLHUP, even on eg. unconnected UDP sockets -- RR */ 798 default: 799 sk->sk_shutdown |= how; 800 if (sk->sk_prot->shutdown) 801 sk->sk_prot->shutdown(sk, how); 802 break; 803 804 /* Remaining two branches are temporary solution for missing 805 * close() in multithreaded environment. It is _not_ a good idea, 806 * but we have no choice until close() is repaired at VFS level. 807 */ 808 case TCP_LISTEN: 809 if (!(how & RCV_SHUTDOWN)) 810 break; 811 /* Fall through */ 812 case TCP_SYN_SENT: 813 err = sk->sk_prot->disconnect(sk, O_NONBLOCK); 814 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 815 break; 816 } 817 818 /* Wake up anyone sleeping in poll. */ 819 sk->sk_state_change(sk); 820 release_sock(sk); 821 return err; 822} 823EXPORT_SYMBOL(inet_shutdown); 824 825/* 826 * ioctl() calls you can issue on an INET socket. Most of these are 827 * device configuration and stuff and very rarely used. Some ioctls 828 * pass on to the socket itself. 829 * 830 * NOTE: I like the idea of a module for the config stuff. ie ifconfig 831 * loads the devconfigure module does its configuring and unloads it. 832 * There's a good 20K of config code hanging around the kernel. 833 */ 834 835int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 836{ 837 struct sock *sk = sock->sk; 838 int err = 0; 839 struct net *net = sock_net(sk); 840 841 switch (cmd) { 842 case SIOCGSTAMP: 843 err = sock_get_timestamp(sk, (struct timeval __user *)arg); 844 break; 845 case SIOCGSTAMPNS: 846 err = sock_get_timestampns(sk, (struct timespec __user *)arg); 847 break; 848 case SIOCADDRT: 849 case SIOCDELRT: 850 case SIOCRTMSG: 851 err = ip_rt_ioctl(net, cmd, (void __user *)arg); 852 break; 853 case SIOCDARP: 854 case SIOCGARP: 855 case SIOCSARP: 856 err = arp_ioctl(net, cmd, (void __user *)arg); 857 break; 858 case SIOCGIFADDR: 859 case SIOCSIFADDR: 860 case SIOCGIFBRDADDR: 861 case SIOCSIFBRDADDR: 862 case SIOCGIFNETMASK: 863 case SIOCSIFNETMASK: 864 case SIOCGIFDSTADDR: 865 case SIOCSIFDSTADDR: 866 case SIOCSIFPFLAGS: 867 case SIOCGIFPFLAGS: 868 case SIOCSIFFLAGS: 869 err = devinet_ioctl(net, cmd, (void __user *)arg); 870 break; 871 default: 872 if (sk->sk_prot->ioctl) 873 err = sk->sk_prot->ioctl(sk, cmd, arg); 874 else 875 err = -ENOIOCTLCMD; 876 break; 877 } 878 return err; 879} 880EXPORT_SYMBOL(inet_ioctl); 881 882const struct proto_ops inet_stream_ops = { 883 .family = PF_INET, 884 .owner = THIS_MODULE, 885 .release = inet_release, 886 .bind = inet_bind, 887 .connect = inet_stream_connect, 888 .socketpair = sock_no_socketpair, 889 .accept = inet_accept, 890 .getname = inet_getname, 891 .poll = tcp_poll, 892 .ioctl = inet_ioctl, 893 .listen = inet_listen, 894 .shutdown = inet_shutdown, 895 .setsockopt = sock_common_setsockopt, 896 .getsockopt = sock_common_getsockopt, 897 .sendmsg = tcp_sendmsg, 898 .recvmsg = inet_recvmsg, 899 .mmap = sock_no_mmap, 900 .sendpage = tcp_sendpage, 901 .splice_read = tcp_splice_read, 902#ifdef CONFIG_COMPAT 903 .compat_setsockopt = compat_sock_common_setsockopt, 904 .compat_getsockopt = compat_sock_common_getsockopt, 905#endif 906}; 907EXPORT_SYMBOL(inet_stream_ops); 908 909const struct proto_ops inet_dgram_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 = udp_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 = inet_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}; 933EXPORT_SYMBOL(inet_dgram_ops); 934 935/* 936 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 937 * udp_poll 938 */ 939static const struct proto_ops inet_sockraw_ops = { 940 .family = PF_INET, 941 .owner = THIS_MODULE, 942 .release = inet_release, 943 .bind = inet_bind, 944 .connect = inet_dgram_connect, 945 .socketpair = sock_no_socketpair, 946 .accept = sock_no_accept, 947 .getname = inet_getname, 948 .poll = datagram_poll, 949 .ioctl = inet_ioctl, 950 .listen = sock_no_listen, 951 .shutdown = inet_shutdown, 952 .setsockopt = sock_common_setsockopt, 953 .getsockopt = sock_common_getsockopt, 954 .sendmsg = inet_sendmsg, 955 .recvmsg = inet_recvmsg, 956 .mmap = sock_no_mmap, 957 .sendpage = inet_sendpage, 958#ifdef CONFIG_COMPAT 959 .compat_setsockopt = compat_sock_common_setsockopt, 960 .compat_getsockopt = compat_sock_common_getsockopt, 961#endif 962}; 963 964static const struct net_proto_family inet_family_ops = { 965 .family = PF_INET, 966 .create = inet_create, 967 .owner = THIS_MODULE, 968}; 969 970/* Upon startup we insert all the elements in inetsw_array[] into 971 * the linked list inetsw. 972 */ 973static struct inet_protosw inetsw_array[] = 974{ 975 { 976 .type = SOCK_STREAM, 977 .protocol = IPPROTO_TCP, 978 .prot = &tcp_prot, 979 .ops = &inet_stream_ops, 980 .no_check = 0, 981 .flags = INET_PROTOSW_PERMANENT | 982 INET_PROTOSW_ICSK, 983 }, 984 985 { 986 .type = SOCK_DGRAM, 987 .protocol = IPPROTO_UDP, 988 .prot = &udp_prot, 989 .ops = &inet_dgram_ops, 990 .no_check = UDP_CSUM_DEFAULT, 991 .flags = INET_PROTOSW_PERMANENT, 992 }, 993 994 995 { 996 .type = SOCK_RAW, 997 .protocol = IPPROTO_IP, /* wild card */ 998 .prot = &raw_prot, 999 .ops = &inet_sockraw_ops, 1000 .no_check = UDP_CSUM_DEFAULT, 1001 .flags = INET_PROTOSW_REUSE, 1002 } 1003}; 1004 1005#define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) 1006 1007void inet_register_protosw(struct inet_protosw *p) 1008{ 1009 struct list_head *lh; 1010 struct inet_protosw *answer; 1011 int protocol = p->protocol; 1012 struct list_head *last_perm; 1013 1014 spin_lock_bh(&inetsw_lock); 1015 1016 if (p->type >= SOCK_MAX) 1017 goto out_illegal; 1018 1019 /* If we are trying to override a permanent protocol, bail. */ 1020 answer = NULL; 1021 last_perm = &inetsw[p->type]; 1022 list_for_each(lh, &inetsw[p->type]) { 1023 answer = list_entry(lh, struct inet_protosw, list); 1024 1025 /* Check only the non-wild match. */ 1026 if (INET_PROTOSW_PERMANENT & answer->flags) { 1027 if (protocol == answer->protocol) 1028 break; 1029 last_perm = lh; 1030 } 1031 1032 answer = NULL; 1033 } 1034 if (answer) 1035 goto out_permanent; 1036 1037 /* Add the new entry after the last permanent entry if any, so that 1038 * the new entry does not override a permanent entry when matched with 1039 * a wild-card protocol. But it is allowed to override any existing 1040 * non-permanent entry. This means that when we remove this entry, the 1041 * system automatically returns to the old behavior. 1042 */ 1043 list_add_rcu(&p->list, last_perm); 1044out: 1045 spin_unlock_bh(&inetsw_lock); 1046 1047 return; 1048 1049out_permanent: 1050 printk(KERN_ERR "Attempt to override permanent protocol %d.\n", 1051 protocol); 1052 goto out; 1053 1054out_illegal: 1055 printk(KERN_ERR 1056 "Ignoring attempt to register invalid socket type %d.\n", 1057 p->type); 1058 goto out; 1059} 1060EXPORT_SYMBOL(inet_register_protosw); 1061 1062void inet_unregister_protosw(struct inet_protosw *p) 1063{ 1064 if (INET_PROTOSW_PERMANENT & p->flags) { 1065 printk(KERN_ERR 1066 "Attempt to unregister permanent protocol %d.\n", 1067 p->protocol); 1068 } else { 1069 spin_lock_bh(&inetsw_lock); 1070 list_del_rcu(&p->list); 1071 spin_unlock_bh(&inetsw_lock); 1072 1073 synchronize_net(); 1074 } 1075} 1076EXPORT_SYMBOL(inet_unregister_protosw); 1077 1078/* 1079 * Shall we try to damage output packets if routing dev changes? 1080 */ 1081 1082int sysctl_ip_dynaddr __read_mostly; 1083 1084static int inet_sk_reselect_saddr(struct sock *sk) 1085{ 1086 struct inet_sock *inet = inet_sk(sk); 1087 int err; 1088 struct rtable *rt; 1089 __be32 old_saddr = inet->inet_saddr; 1090 __be32 new_saddr; 1091 __be32 daddr = inet->inet_daddr; 1092 1093 if (inet->opt && inet->opt->srr) 1094 daddr = inet->opt->faddr; 1095 1096 /* Query new route. */ 1097 err = ip_route_connect(&rt, daddr, 0, 1098 RT_CONN_FLAGS(sk), 1099 sk->sk_bound_dev_if, 1100 sk->sk_protocol, 1101 inet->inet_sport, inet->inet_dport, sk, 0); 1102 if (err) 1103 return err; 1104 1105 sk_setup_caps(sk, &rt->dst); 1106 1107 new_saddr = rt->rt_src; 1108 1109 if (new_saddr == old_saddr) 1110 return 0; 1111 1112 if (sysctl_ip_dynaddr > 1) { 1113 printk(KERN_INFO "%s(): shifting inet->saddr from %pI4 to %pI4\n", 1114 __func__, &old_saddr, &new_saddr); 1115 } 1116 1117 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr; 1118 1119 /* 1120 * XXX The only one ugly spot where we need to 1121 * XXX really change the sockets identity after 1122 * XXX it has entered the hashes. -DaveM 1123 * 1124 * Besides that, it does not check for connection 1125 * uniqueness. Wait for troubles. 1126 */ 1127 __sk_prot_rehash(sk); 1128 return 0; 1129} 1130 1131int inet_sk_rebuild_header(struct sock *sk) 1132{ 1133 struct inet_sock *inet = inet_sk(sk); 1134 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); 1135 __be32 daddr; 1136 int err; 1137 1138 /* Route is OK, nothing to do. */ 1139 if (rt) 1140 return 0; 1141 1142 /* Reroute. */ 1143 daddr = inet->inet_daddr; 1144 if (inet->opt && inet->opt->srr) 1145 daddr = inet->opt->faddr; 1146{ 1147 struct flowi fl = { 1148 .oif = sk->sk_bound_dev_if, 1149 .mark = sk->sk_mark, 1150 .nl_u = { 1151 .ip4_u = { 1152 .daddr = daddr, 1153 .saddr = inet->inet_saddr, 1154 .tos = RT_CONN_FLAGS(sk), 1155 }, 1156 }, 1157 .proto = sk->sk_protocol, 1158 .flags = inet_sk_flowi_flags(sk), 1159 .uli_u = { 1160 .ports = { 1161 .sport = inet->inet_sport, 1162 .dport = inet->inet_dport, 1163 }, 1164 }, 1165 }; 1166 1167 security_sk_classify_flow(sk, &fl); 1168 err = ip_route_output_flow(sock_net(sk), &rt, &fl, sk, 0); 1169} 1170 if (!err) 1171 sk_setup_caps(sk, &rt->dst); 1172 else { 1173 /* Routing failed... */ 1174 sk->sk_route_caps = 0; 1175 /* 1176 * Other protocols have to map its equivalent state to TCP_SYN_SENT. 1177 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme 1178 */ 1179 if (!sysctl_ip_dynaddr || 1180 sk->sk_state != TCP_SYN_SENT || 1181 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 1182 (err = inet_sk_reselect_saddr(sk)) != 0) 1183 sk->sk_err_soft = -err; 1184 } 1185 1186 return err; 1187} 1188EXPORT_SYMBOL(inet_sk_rebuild_header); 1189 1190static int inet_gso_send_check(struct sk_buff *skb) 1191{ 1192 struct iphdr *iph; 1193 const struct net_protocol *ops; 1194 int proto; 1195 int ihl; 1196 int err = -EINVAL; 1197 1198 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1199 goto out; 1200 1201 iph = ip_hdr(skb); 1202 ihl = iph->ihl * 4; 1203 if (ihl < sizeof(*iph)) 1204 goto out; 1205 1206 if (unlikely(!pskb_may_pull(skb, ihl))) 1207 goto out; 1208 1209 __skb_pull(skb, ihl); 1210 skb_reset_transport_header(skb); 1211 iph = ip_hdr(skb); 1212 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1213 err = -EPROTONOSUPPORT; 1214 1215 rcu_read_lock(); 1216 ops = rcu_dereference(inet_protos[proto]); 1217 if (likely(ops && ops->gso_send_check)) 1218 err = ops->gso_send_check(skb); 1219 rcu_read_unlock(); 1220 1221out: 1222 return err; 1223} 1224 1225static struct sk_buff *inet_gso_segment(struct sk_buff *skb, int features) 1226{ 1227 struct sk_buff *segs = ERR_PTR(-EINVAL); 1228 struct iphdr *iph; 1229 const struct net_protocol *ops; 1230 int proto; 1231 int ihl; 1232 int id; 1233 unsigned int offset = 0; 1234 1235 if (!(features & NETIF_F_V4_CSUM)) 1236 features &= ~NETIF_F_SG; 1237 1238 if (unlikely(skb_shinfo(skb)->gso_type & 1239 ~(SKB_GSO_TCPV4 | 1240 SKB_GSO_UDP | 1241 SKB_GSO_DODGY | 1242 SKB_GSO_TCP_ECN | 1243 0))) 1244 goto out; 1245 1246 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1247 goto out; 1248 1249 iph = ip_hdr(skb); 1250 ihl = iph->ihl * 4; 1251 if (ihl < sizeof(*iph)) 1252 goto out; 1253 1254 if (unlikely(!pskb_may_pull(skb, ihl))) 1255 goto out; 1256 1257 __skb_pull(skb, ihl); 1258 skb_reset_transport_header(skb); 1259 iph = ip_hdr(skb); 1260 id = ntohs(iph->id); 1261 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1262 segs = ERR_PTR(-EPROTONOSUPPORT); 1263 1264 rcu_read_lock(); 1265 ops = rcu_dereference(inet_protos[proto]); 1266 if (likely(ops && ops->gso_segment)) 1267 segs = ops->gso_segment(skb, features); 1268 rcu_read_unlock(); 1269 1270 if (!segs || IS_ERR(segs)) 1271 goto out; 1272 1273 skb = segs; 1274 do { 1275 iph = ip_hdr(skb); 1276 if (proto == IPPROTO_UDP) { 1277 iph->id = htons(id); 1278 iph->frag_off = htons(offset >> 3); 1279 if (skb->next != NULL) 1280 iph->frag_off |= htons(IP_MF); 1281 offset += (skb->len - skb->mac_len - iph->ihl * 4); 1282 } else 1283 iph->id = htons(id++); 1284 iph->tot_len = htons(skb->len - skb->mac_len); 1285 iph->check = 0; 1286 iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl); 1287 } while ((skb = skb->next)); 1288 1289out: 1290 return segs; 1291} 1292 1293static struct sk_buff **inet_gro_receive(struct sk_buff **head, 1294 struct sk_buff *skb) 1295{ 1296 const struct net_protocol *ops; 1297 struct sk_buff **pp = NULL; 1298 struct sk_buff *p; 1299 struct iphdr *iph; 1300 unsigned int hlen; 1301 unsigned int off; 1302 unsigned int id; 1303 int flush = 1; 1304 int proto; 1305 1306 off = skb_gro_offset(skb); 1307 hlen = off + sizeof(*iph); 1308 iph = skb_gro_header_fast(skb, off); 1309 if (skb_gro_header_hard(skb, hlen)) { 1310 iph = skb_gro_header_slow(skb, hlen, off); 1311 if (unlikely(!iph)) 1312 goto out; 1313 } 1314 1315 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1316 1317 rcu_read_lock(); 1318 ops = rcu_dereference(inet_protos[proto]); 1319 if (!ops || !ops->gro_receive) 1320 goto out_unlock; 1321 1322 if (*(u8 *)iph != 0x45) 1323 goto out_unlock; 1324 1325 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) 1326 goto out_unlock; 1327 1328 id = ntohl(*(__be32 *)&iph->id); 1329 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id ^ IP_DF)); 1330 id >>= 16; 1331 1332 for (p = *head; p; p = p->next) { 1333 struct iphdr *iph2; 1334 1335 if (!NAPI_GRO_CB(p)->same_flow) 1336 continue; 1337 1338 iph2 = ip_hdr(p); 1339 1340 if ((iph->protocol ^ iph2->protocol) | 1341 (iph->tos ^ iph2->tos) | 1342 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) | 1343 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) { 1344 NAPI_GRO_CB(p)->same_flow = 0; 1345 continue; 1346 } 1347 1348 /* All fields must match except length and checksum. */ 1349 NAPI_GRO_CB(p)->flush |= 1350 (iph->ttl ^ iph2->ttl) | 1351 ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id); 1352 1353 NAPI_GRO_CB(p)->flush |= flush; 1354 } 1355 1356 NAPI_GRO_CB(skb)->flush |= flush; 1357 skb_gro_pull(skb, sizeof(*iph)); 1358 skb_set_transport_header(skb, skb_gro_offset(skb)); 1359 1360 pp = ops->gro_receive(head, skb); 1361 1362out_unlock: 1363 rcu_read_unlock(); 1364 1365out: 1366 NAPI_GRO_CB(skb)->flush |= flush; 1367 1368 return pp; 1369} 1370 1371static int inet_gro_complete(struct sk_buff *skb) 1372{ 1373 const struct net_protocol *ops; 1374 struct iphdr *iph = ip_hdr(skb); 1375 int proto = iph->protocol & (MAX_INET_PROTOS - 1); 1376 int err = -ENOSYS; 1377 __be16 newlen = htons(skb->len - skb_network_offset(skb)); 1378 1379 csum_replace2(&iph->check, iph->tot_len, newlen); 1380 iph->tot_len = newlen; 1381 1382 rcu_read_lock(); 1383 ops = rcu_dereference(inet_protos[proto]); 1384 if (WARN_ON(!ops || !ops->gro_complete)) 1385 goto out_unlock; 1386 1387 err = ops->gro_complete(skb); 1388 1389out_unlock: 1390 rcu_read_unlock(); 1391 1392 return err; 1393} 1394 1395int inet_ctl_sock_create(struct sock **sk, unsigned short family, 1396 unsigned short type, unsigned char protocol, 1397 struct net *net) 1398{ 1399 struct socket *sock; 1400 int rc = sock_create_kern(family, type, protocol, &sock); 1401 1402 if (rc == 0) { 1403 *sk = sock->sk; 1404 (*sk)->sk_allocation = GFP_ATOMIC; 1405 /* 1406 * Unhash it so that IP input processing does not even see it, 1407 * we do not wish this socket to see incoming packets. 1408 */ 1409 (*sk)->sk_prot->unhash(*sk); 1410 1411 sk_change_net(*sk, net); 1412 } 1413 return rc; 1414} 1415EXPORT_SYMBOL_GPL(inet_ctl_sock_create); 1416 1417unsigned long snmp_fold_field(void __percpu *mib[], int offt) 1418{ 1419 unsigned long res = 0; 1420 int i; 1421 1422 for_each_possible_cpu(i) { 1423 res += *(((unsigned long *) per_cpu_ptr(mib[0], i)) + offt); 1424 res += *(((unsigned long *) per_cpu_ptr(mib[1], i)) + offt); 1425 } 1426 return res; 1427} 1428EXPORT_SYMBOL_GPL(snmp_fold_field); 1429 1430#if BITS_PER_LONG==32 1431 1432u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t syncp_offset) 1433{ 1434 u64 res = 0; 1435 int cpu; 1436 1437 for_each_possible_cpu(cpu) { 1438 void *bhptr, *userptr; 1439 struct u64_stats_sync *syncp; 1440 u64 v_bh, v_user; 1441 unsigned int start; 1442 1443 /* first mib used by softirq context, we must use _bh() accessors */ 1444 bhptr = per_cpu_ptr(SNMP_STAT_BHPTR(mib), cpu); 1445 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset); 1446 do { 1447 start = u64_stats_fetch_begin_bh(syncp); 1448 v_bh = *(((u64 *) bhptr) + offt); 1449 } while (u64_stats_fetch_retry_bh(syncp, start)); 1450 1451 /* second mib used in USER context */ 1452 userptr = per_cpu_ptr(SNMP_STAT_USRPTR(mib), cpu); 1453 syncp = (struct u64_stats_sync *)(userptr + syncp_offset); 1454 do { 1455 start = u64_stats_fetch_begin(syncp); 1456 v_user = *(((u64 *) userptr) + offt); 1457 } while (u64_stats_fetch_retry(syncp, start)); 1458 1459 res += v_bh + v_user; 1460 } 1461 return res; 1462} 1463EXPORT_SYMBOL_GPL(snmp_fold_field64); 1464#endif 1465 1466int snmp_mib_init(void __percpu *ptr[2], size_t mibsize, size_t align) 1467{ 1468 BUG_ON(ptr == NULL); 1469 ptr[0] = __alloc_percpu(mibsize, align); 1470 if (!ptr[0]) 1471 goto err0; 1472 ptr[1] = __alloc_percpu(mibsize, align); 1473 if (!ptr[1]) 1474 goto err1; 1475 return 0; 1476err1: 1477 free_percpu(ptr[0]); 1478 ptr[0] = NULL; 1479err0: 1480 return -ENOMEM; 1481} 1482EXPORT_SYMBOL_GPL(snmp_mib_init); 1483 1484void snmp_mib_free(void __percpu *ptr[2]) 1485{ 1486 BUG_ON(ptr == NULL); 1487 free_percpu(ptr[0]); 1488 free_percpu(ptr[1]); 1489 ptr[0] = ptr[1] = NULL; 1490} 1491EXPORT_SYMBOL_GPL(snmp_mib_free); 1492 1493#ifdef CONFIG_IP_MULTICAST 1494static const struct net_protocol igmp_protocol = { 1495 .handler = igmp_rcv, 1496 .netns_ok = 1, 1497}; 1498#endif 1499 1500static const struct net_protocol tcp_protocol = { 1501 .handler = tcp_v4_rcv, 1502 .err_handler = tcp_v4_err, 1503 .gso_send_check = tcp_v4_gso_send_check, 1504 .gso_segment = tcp_tso_segment, 1505 .gro_receive = tcp4_gro_receive, 1506 .gro_complete = tcp4_gro_complete, 1507 .no_policy = 1, 1508 .netns_ok = 1, 1509}; 1510 1511static const struct net_protocol udp_protocol = { 1512 .handler = udp_rcv, 1513 .err_handler = udp_err, 1514 .gso_send_check = udp4_ufo_send_check, 1515 .gso_segment = udp4_ufo_fragment, 1516 .no_policy = 1, 1517 .netns_ok = 1, 1518}; 1519 1520static const struct net_protocol icmp_protocol = { 1521 .handler = icmp_rcv, 1522 .no_policy = 1, 1523 .netns_ok = 1, 1524}; 1525 1526static __net_init int ipv4_mib_init_net(struct net *net) 1527{ 1528 if (snmp_mib_init((void __percpu **)net->mib.tcp_statistics, 1529 sizeof(struct tcp_mib), 1530 __alignof__(struct tcp_mib)) < 0) 1531 goto err_tcp_mib; 1532 if (snmp_mib_init((void __percpu **)net->mib.ip_statistics, 1533 sizeof(struct ipstats_mib), 1534 __alignof__(struct ipstats_mib)) < 0) 1535 goto err_ip_mib; 1536 if (snmp_mib_init((void __percpu **)net->mib.net_statistics, 1537 sizeof(struct linux_mib), 1538 __alignof__(struct linux_mib)) < 0) 1539 goto err_net_mib; 1540 if (snmp_mib_init((void __percpu **)net->mib.udp_statistics, 1541 sizeof(struct udp_mib), 1542 __alignof__(struct udp_mib)) < 0) 1543 goto err_udp_mib; 1544 if (snmp_mib_init((void __percpu **)net->mib.udplite_statistics, 1545 sizeof(struct udp_mib), 1546 __alignof__(struct udp_mib)) < 0) 1547 goto err_udplite_mib; 1548 if (snmp_mib_init((void __percpu **)net->mib.icmp_statistics, 1549 sizeof(struct icmp_mib), 1550 __alignof__(struct icmp_mib)) < 0) 1551 goto err_icmp_mib; 1552 if (snmp_mib_init((void __percpu **)net->mib.icmpmsg_statistics, 1553 sizeof(struct icmpmsg_mib), 1554 __alignof__(struct icmpmsg_mib)) < 0) 1555 goto err_icmpmsg_mib; 1556 1557 tcp_mib_init(net); 1558 return 0; 1559 1560err_icmpmsg_mib: 1561 snmp_mib_free((void __percpu **)net->mib.icmp_statistics); 1562err_icmp_mib: 1563 snmp_mib_free((void __percpu **)net->mib.udplite_statistics); 1564err_udplite_mib: 1565 snmp_mib_free((void __percpu **)net->mib.udp_statistics); 1566err_udp_mib: 1567 snmp_mib_free((void __percpu **)net->mib.net_statistics); 1568err_net_mib: 1569 snmp_mib_free((void __percpu **)net->mib.ip_statistics); 1570err_ip_mib: 1571 snmp_mib_free((void __percpu **)net->mib.tcp_statistics); 1572err_tcp_mib: 1573 return -ENOMEM; 1574} 1575 1576static __net_exit void ipv4_mib_exit_net(struct net *net) 1577{ 1578 snmp_mib_free((void __percpu **)net->mib.icmpmsg_statistics); 1579 snmp_mib_free((void __percpu **)net->mib.icmp_statistics); 1580 snmp_mib_free((void __percpu **)net->mib.udplite_statistics); 1581 snmp_mib_free((void __percpu **)net->mib.udp_statistics); 1582 snmp_mib_free((void __percpu **)net->mib.net_statistics); 1583 snmp_mib_free((void __percpu **)net->mib.ip_statistics); 1584 snmp_mib_free((void __percpu **)net->mib.tcp_statistics); 1585} 1586 1587static __net_initdata struct pernet_operations ipv4_mib_ops = { 1588 .init = ipv4_mib_init_net, 1589 .exit = ipv4_mib_exit_net, 1590}; 1591 1592static int __init init_ipv4_mibs(void) 1593{ 1594 return register_pernet_subsys(&ipv4_mib_ops); 1595} 1596 1597static int ipv4_proc_init(void); 1598 1599/* 1600 * IP protocol layer initialiser 1601 */ 1602 1603static struct packet_type ip_packet_type __read_mostly = { 1604 .type = cpu_to_be16(ETH_P_IP), 1605 .func = ip_rcv, 1606 .gso_send_check = inet_gso_send_check, 1607 .gso_segment = inet_gso_segment, 1608 .gro_receive = inet_gro_receive, 1609 .gro_complete = inet_gro_complete, 1610}; 1611 1612static int __init inet_init(void) 1613{ 1614 struct sk_buff *dummy_skb; 1615 struct inet_protosw *q; 1616 struct list_head *r; 1617 int rc = -EINVAL; 1618 1619 BUILD_BUG_ON(sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb)); 1620 1621 sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL); 1622 if (!sysctl_local_reserved_ports) 1623 goto out; 1624 1625 rc = proto_register(&tcp_prot, 1); 1626 if (rc) 1627 goto out_free_reserved_ports; 1628 1629 rc = proto_register(&udp_prot, 1); 1630 if (rc) 1631 goto out_unregister_tcp_proto; 1632 1633 rc = proto_register(&raw_prot, 1); 1634 if (rc) 1635 goto out_unregister_udp_proto; 1636 1637 /* 1638 * Tell SOCKET that we are alive... 1639 */ 1640 1641 (void)sock_register(&inet_family_ops); 1642 1643#ifdef CONFIG_SYSCTL 1644 ip_static_sysctl_init(); 1645#endif 1646 1647 /* 1648 * Add all the base protocols. 1649 */ 1650 1651 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 1652 printk(KERN_CRIT "inet_init: Cannot add ICMP protocol\n"); 1653 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) 1654 printk(KERN_CRIT "inet_init: Cannot add UDP protocol\n"); 1655 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) 1656 printk(KERN_CRIT "inet_init: Cannot add TCP protocol\n"); 1657#ifdef CONFIG_IP_MULTICAST 1658 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 1659 printk(KERN_CRIT "inet_init: Cannot add IGMP protocol\n"); 1660#endif 1661 1662 /* Register the socket-side information for inet_create. */ 1663 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 1664 INIT_LIST_HEAD(r); 1665 1666 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 1667 inet_register_protosw(q); 1668 1669 /* 1670 * Set the ARP module up 1671 */ 1672 1673 arp_init(); 1674 1675 /* 1676 * Set the IP module up 1677 */ 1678 1679 ip_init(); 1680 1681 tcp_v4_init(); 1682 1683 /* Setup TCP slab cache for open requests. */ 1684 tcp_init(); 1685 1686 /* Setup UDP memory threshold */ 1687 udp_init(); 1688 1689 /* Add UDP-Lite (RFC 3828) */ 1690 udplite4_register(); 1691 1692 /* 1693 * Set the ICMP layer up 1694 */ 1695 1696 if (icmp_init() < 0) 1697 panic("Failed to create the ICMP control socket.\n"); 1698 1699 /* 1700 * Initialise the multicast router 1701 */ 1702#if defined(CONFIG_IP_MROUTE) 1703 if (ip_mr_init()) 1704 printk(KERN_CRIT "inet_init: Cannot init ipv4 mroute\n"); 1705#endif 1706 /* 1707 * Initialise per-cpu ipv4 mibs 1708 */ 1709 1710 if (init_ipv4_mibs()) 1711 printk(KERN_CRIT "inet_init: Cannot init ipv4 mibs\n"); 1712 1713 ipv4_proc_init(); 1714 1715 ipfrag_init(); 1716 1717 dev_add_pack(&ip_packet_type); 1718 1719 rc = 0; 1720out: 1721 return rc; 1722out_unregister_udp_proto: 1723 proto_unregister(&udp_prot); 1724out_unregister_tcp_proto: 1725 proto_unregister(&tcp_prot); 1726out_free_reserved_ports: 1727 kfree(sysctl_local_reserved_ports); 1728 goto out; 1729} 1730 1731fs_initcall(inet_init); 1732 1733/* ------------------------------------------------------------------------ */ 1734 1735#ifdef CONFIG_PROC_FS 1736static int __init ipv4_proc_init(void) 1737{ 1738 int rc = 0; 1739 1740 if (raw_proc_init()) 1741 goto out_raw; 1742 if (tcp4_proc_init()) 1743 goto out_tcp; 1744 if (udp4_proc_init()) 1745 goto out_udp; 1746 if (ip_misc_proc_init()) 1747 goto out_misc; 1748out: 1749 return rc; 1750out_misc: 1751 udp4_proc_exit(); 1752out_udp: 1753 tcp4_proc_exit(); 1754out_tcp: 1755 raw_proc_exit(); 1756out_raw: 1757 rc = -ENOMEM; 1758 goto out; 1759} 1760 1761#else /* CONFIG_PROC_FS */ 1762static int __init ipv4_proc_init(void) 1763{ 1764 return 0; 1765} 1766#endif /* CONFIG_PROC_FS */ 1767 1768MODULE_ALIAS_NETPROTO(PF_INET); 1769 1770