af_inet.c revision 22061d8014455b01eb018bd6c35a1b3040ccc230
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#define pr_fmt(fmt) "IPv4: " fmt 69 70#include <linux/err.h> 71#include <linux/errno.h> 72#include <linux/types.h> 73#include <linux/socket.h> 74#include <linux/in.h> 75#include <linux/kernel.h> 76#include <linux/module.h> 77#include <linux/sched.h> 78#include <linux/timer.h> 79#include <linux/string.h> 80#include <linux/sockios.h> 81#include <linux/net.h> 82#include <linux/capability.h> 83#include <linux/fcntl.h> 84#include <linux/mm.h> 85#include <linux/interrupt.h> 86#include <linux/stat.h> 87#include <linux/init.h> 88#include <linux/poll.h> 89#include <linux/netfilter_ipv4.h> 90#include <linux/random.h> 91#include <linux/slab.h> 92 93#include <asm/uaccess.h> 94 95#include <linux/inet.h> 96#include <linux/igmp.h> 97#include <linux/inetdevice.h> 98#include <linux/netdevice.h> 99#include <net/checksum.h> 100#include <net/ip.h> 101#include <net/protocol.h> 102#include <net/arp.h> 103#include <net/route.h> 104#include <net/ip_fib.h> 105#include <net/inet_connection_sock.h> 106#include <net/tcp.h> 107#include <net/udp.h> 108#include <net/udplite.h> 109#include <net/ping.h> 110#include <linux/skbuff.h> 111#include <net/sock.h> 112#include <net/raw.h> 113#include <net/icmp.h> 114#include <net/ipip.h> 115#include <net/inet_common.h> 116#include <net/xfrm.h> 117#include <net/net_namespace.h> 118#ifdef CONFIG_IP_MROUTE 119#include <linux/mroute.h> 120#endif 121 122 123/* The inetsw table contains everything that inet_create needs to 124 * build a new socket. 125 */ 126static struct list_head inetsw[SOCK_MAX]; 127static DEFINE_SPINLOCK(inetsw_lock); 128 129struct ipv4_config ipv4_config; 130EXPORT_SYMBOL(ipv4_config); 131 132/* New destruction routine */ 133 134void inet_sock_destruct(struct sock *sk) 135{ 136 struct inet_sock *inet = inet_sk(sk); 137 138 __skb_queue_purge(&sk->sk_receive_queue); 139 __skb_queue_purge(&sk->sk_error_queue); 140 141 sk_mem_reclaim(sk); 142 143 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) { 144 pr_err("Attempt to release TCP socket in state %d %p\n", 145 sk->sk_state, sk); 146 return; 147 } 148 if (!sock_flag(sk, SOCK_DEAD)) { 149 pr_err("Attempt to release alive inet socket %p\n", sk); 150 return; 151 } 152 153 WARN_ON(atomic_read(&sk->sk_rmem_alloc)); 154 WARN_ON(atomic_read(&sk->sk_wmem_alloc)); 155 WARN_ON(sk->sk_wmem_queued); 156 WARN_ON(sk->sk_forward_alloc); 157 158 kfree(rcu_dereference_protected(inet->inet_opt, 1)); 159 dst_release(rcu_dereference_check(sk->sk_dst_cache, 1)); 160 dst_release(sk->sk_rx_dst); 161 sk_refcnt_debug_dec(sk); 162} 163EXPORT_SYMBOL(inet_sock_destruct); 164 165/* 166 * The routines beyond this point handle the behaviour of an AF_INET 167 * socket object. Mostly it punts to the subprotocols of IP to do 168 * the work. 169 */ 170 171/* 172 * Automatically bind an unbound socket. 173 */ 174 175static int inet_autobind(struct sock *sk) 176{ 177 struct inet_sock *inet; 178 /* We may need to bind the socket. */ 179 lock_sock(sk); 180 inet = inet_sk(sk); 181 if (!inet->inet_num) { 182 if (sk->sk_prot->get_port(sk, 0)) { 183 release_sock(sk); 184 return -EAGAIN; 185 } 186 inet->inet_sport = htons(inet->inet_num); 187 } 188 release_sock(sk); 189 return 0; 190} 191 192/* 193 * Move a socket into listening state. 194 */ 195int inet_listen(struct socket *sock, int backlog) 196{ 197 struct sock *sk = sock->sk; 198 unsigned char old_state; 199 int err; 200 201 lock_sock(sk); 202 203 err = -EINVAL; 204 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM) 205 goto out; 206 207 old_state = sk->sk_state; 208 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN))) 209 goto out; 210 211 /* Really, if the socket is already in listen state 212 * we can only allow the backlog to be adjusted. 213 */ 214 if (old_state != TCP_LISTEN) { 215 /* Check special setups for testing purpose to enable TFO w/o 216 * requiring TCP_FASTOPEN sockopt. 217 * Note that only TCP sockets (SOCK_STREAM) will reach here. 218 * Also fastopenq may already been allocated because this 219 * socket was in TCP_LISTEN state previously but was 220 * shutdown() (rather than close()). 221 */ 222 if ((sysctl_tcp_fastopen & TFO_SERVER_ENABLE) != 0 && 223 inet_csk(sk)->icsk_accept_queue.fastopenq == NULL) { 224 if ((sysctl_tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) != 0) 225 err = fastopen_init_queue(sk, backlog); 226 else if ((sysctl_tcp_fastopen & 227 TFO_SERVER_WO_SOCKOPT2) != 0) 228 err = fastopen_init_queue(sk, 229 ((uint)sysctl_tcp_fastopen) >> 16); 230 else 231 err = 0; 232 if (err) 233 goto out; 234 } 235 err = inet_csk_listen_start(sk, backlog); 236 if (err) 237 goto out; 238 } 239 sk->sk_max_ack_backlog = backlog; 240 err = 0; 241 242out: 243 release_sock(sk); 244 return err; 245} 246EXPORT_SYMBOL(inet_listen); 247 248u32 inet_ehash_secret __read_mostly; 249EXPORT_SYMBOL(inet_ehash_secret); 250 251/* 252 * inet_ehash_secret must be set exactly once 253 */ 254void build_ehash_secret(void) 255{ 256 u32 rnd; 257 258 do { 259 get_random_bytes(&rnd, sizeof(rnd)); 260 } while (rnd == 0); 261 262 cmpxchg(&inet_ehash_secret, 0, rnd); 263} 264EXPORT_SYMBOL(build_ehash_secret); 265 266static inline int inet_netns_ok(struct net *net, __u8 protocol) 267{ 268 const struct net_protocol *ipprot; 269 270 if (net_eq(net, &init_net)) 271 return 1; 272 273 ipprot = rcu_dereference(inet_protos[protocol]); 274 if (ipprot == NULL) { 275 /* raw IP is OK */ 276 return 1; 277 } 278 return ipprot->netns_ok; 279} 280 281/* 282 * Create an inet socket. 283 */ 284 285static int inet_create(struct net *net, struct socket *sock, int protocol, 286 int kern) 287{ 288 struct sock *sk; 289 struct inet_protosw *answer; 290 struct inet_sock *inet; 291 struct proto *answer_prot; 292 unsigned char answer_flags; 293 char answer_no_check; 294 int try_loading_module = 0; 295 int err; 296 297 if (unlikely(!inet_ehash_secret)) 298 if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM) 299 build_ehash_secret(); 300 301 sock->state = SS_UNCONNECTED; 302 303 /* Look for the requested type/protocol pair. */ 304lookup_protocol: 305 err = -ESOCKTNOSUPPORT; 306 rcu_read_lock(); 307 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) { 308 309 err = 0; 310 /* Check the non-wild match. */ 311 if (protocol == answer->protocol) { 312 if (protocol != IPPROTO_IP) 313 break; 314 } else { 315 /* Check for the two wild cases. */ 316 if (IPPROTO_IP == protocol) { 317 protocol = answer->protocol; 318 break; 319 } 320 if (IPPROTO_IP == answer->protocol) 321 break; 322 } 323 err = -EPROTONOSUPPORT; 324 } 325 326 if (unlikely(err)) { 327 if (try_loading_module < 2) { 328 rcu_read_unlock(); 329 /* 330 * Be more specific, e.g. net-pf-2-proto-132-type-1 331 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) 332 */ 333 if (++try_loading_module == 1) 334 request_module("net-pf-%d-proto-%d-type-%d", 335 PF_INET, protocol, sock->type); 336 /* 337 * Fall back to generic, e.g. net-pf-2-proto-132 338 * (net-pf-PF_INET-proto-IPPROTO_SCTP) 339 */ 340 else 341 request_module("net-pf-%d-proto-%d", 342 PF_INET, protocol); 343 goto lookup_protocol; 344 } else 345 goto out_rcu_unlock; 346 } 347 348 err = -EPERM; 349 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW)) 350 goto out_rcu_unlock; 351 352 err = -EAFNOSUPPORT; 353 if (!inet_netns_ok(net, protocol)) 354 goto out_rcu_unlock; 355 356 sock->ops = answer->ops; 357 answer_prot = answer->prot; 358 answer_no_check = answer->no_check; 359 answer_flags = answer->flags; 360 rcu_read_unlock(); 361 362 WARN_ON(answer_prot->slab == NULL); 363 364 err = -ENOBUFS; 365 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot); 366 if (sk == NULL) 367 goto out; 368 369 err = 0; 370 sk->sk_no_check = answer_no_check; 371 if (INET_PROTOSW_REUSE & answer_flags) 372 sk->sk_reuse = SK_CAN_REUSE; 373 374 inet = inet_sk(sk); 375 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 376 377 inet->nodefrag = 0; 378 379 if (SOCK_RAW == sock->type) { 380 inet->inet_num = protocol; 381 if (IPPROTO_RAW == protocol) 382 inet->hdrincl = 1; 383 } 384 385 if (ipv4_config.no_pmtu_disc) 386 inet->pmtudisc = IP_PMTUDISC_DONT; 387 else 388 inet->pmtudisc = IP_PMTUDISC_WANT; 389 390 inet->inet_id = 0; 391 392 sock_init_data(sock, sk); 393 394 sk->sk_destruct = inet_sock_destruct; 395 sk->sk_protocol = protocol; 396 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 397 398 inet->uc_ttl = -1; 399 inet->mc_loop = 1; 400 inet->mc_ttl = 1; 401 inet->mc_all = 1; 402 inet->mc_index = 0; 403 inet->mc_list = NULL; 404 inet->rcv_tos = 0; 405 406 sk_refcnt_debug_inc(sk); 407 408 if (inet->inet_num) { 409 /* It assumes that any protocol which allows 410 * the user to assign a number at socket 411 * creation time automatically 412 * shares. 413 */ 414 inet->inet_sport = htons(inet->inet_num); 415 /* Add to protocol hash chains. */ 416 sk->sk_prot->hash(sk); 417 } 418 419 if (sk->sk_prot->init) { 420 err = sk->sk_prot->init(sk); 421 if (err) 422 sk_common_release(sk); 423 } 424out: 425 return err; 426out_rcu_unlock: 427 rcu_read_unlock(); 428 goto out; 429} 430 431 432/* 433 * The peer socket should always be NULL (or else). When we call this 434 * function we are destroying the object and from then on nobody 435 * should refer to it. 436 */ 437int inet_release(struct socket *sock) 438{ 439 struct sock *sk = sock->sk; 440 441 if (sk) { 442 long timeout; 443 444 sock_rps_reset_flow(sk); 445 446 /* Applications forget to leave groups before exiting */ 447 ip_mc_drop_socket(sk); 448 449 /* If linger is set, we don't return until the close 450 * is complete. Otherwise we return immediately. The 451 * actually closing is done the same either way. 452 * 453 * If the close is due to the process exiting, we never 454 * linger.. 455 */ 456 timeout = 0; 457 if (sock_flag(sk, SOCK_LINGER) && 458 !(current->flags & PF_EXITING)) 459 timeout = sk->sk_lingertime; 460 sock->sk = NULL; 461 sk->sk_prot->close(sk, timeout); 462 } 463 return 0; 464} 465EXPORT_SYMBOL(inet_release); 466 467/* It is off by default, see below. */ 468int sysctl_ip_nonlocal_bind __read_mostly; 469EXPORT_SYMBOL(sysctl_ip_nonlocal_bind); 470 471int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 472{ 473 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 474 struct sock *sk = sock->sk; 475 struct inet_sock *inet = inet_sk(sk); 476 unsigned short snum; 477 int chk_addr_ret; 478 int err; 479 480 /* If the socket has its own bind function then use it. (RAW) */ 481 if (sk->sk_prot->bind) { 482 err = sk->sk_prot->bind(sk, uaddr, addr_len); 483 goto out; 484 } 485 err = -EINVAL; 486 if (addr_len < sizeof(struct sockaddr_in)) 487 goto out; 488 489 if (addr->sin_family != AF_INET) { 490 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET) 491 * only if s_addr is INADDR_ANY. 492 */ 493 err = -EAFNOSUPPORT; 494 if (addr->sin_family != AF_UNSPEC || 495 addr->sin_addr.s_addr != htonl(INADDR_ANY)) 496 goto out; 497 } 498 499 chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr); 500 501 /* Not specified by any standard per-se, however it breaks too 502 * many applications when removed. It is unfortunate since 503 * allowing applications to make a non-local bind solves 504 * several problems with systems using dynamic addressing. 505 * (ie. your servers still start up even if your ISDN link 506 * is temporarily down) 507 */ 508 err = -EADDRNOTAVAIL; 509 if (!sysctl_ip_nonlocal_bind && 510 !(inet->freebind || inet->transparent) && 511 addr->sin_addr.s_addr != htonl(INADDR_ANY) && 512 chk_addr_ret != RTN_LOCAL && 513 chk_addr_ret != RTN_MULTICAST && 514 chk_addr_ret != RTN_BROADCAST) 515 goto out; 516 517 snum = ntohs(addr->sin_port); 518 err = -EACCES; 519 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) 520 goto out; 521 522 /* We keep a pair of addresses. rcv_saddr is the one 523 * used by hash lookups, and saddr is used for transmit. 524 * 525 * In the BSD API these are the same except where it 526 * would be illegal to use them (multicast/broadcast) in 527 * which case the sending device address is used. 528 */ 529 lock_sock(sk); 530 531 /* Check these errors (active socket, double bind). */ 532 err = -EINVAL; 533 if (sk->sk_state != TCP_CLOSE || inet->inet_num) 534 goto out_release_sock; 535 536 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 537 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 538 inet->inet_saddr = 0; /* Use device */ 539 540 /* Make sure we are allowed to bind here. */ 541 if (sk->sk_prot->get_port(sk, snum)) { 542 inet->inet_saddr = inet->inet_rcv_saddr = 0; 543 err = -EADDRINUSE; 544 goto out_release_sock; 545 } 546 547 if (inet->inet_rcv_saddr) 548 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 549 if (snum) 550 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 551 inet->inet_sport = htons(inet->inet_num); 552 inet->inet_daddr = 0; 553 inet->inet_dport = 0; 554 sk_dst_reset(sk); 555 err = 0; 556out_release_sock: 557 release_sock(sk); 558out: 559 return err; 560} 561EXPORT_SYMBOL(inet_bind); 562 563int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr, 564 int addr_len, int flags) 565{ 566 struct sock *sk = sock->sk; 567 568 if (addr_len < sizeof(uaddr->sa_family)) 569 return -EINVAL; 570 if (uaddr->sa_family == AF_UNSPEC) 571 return sk->sk_prot->disconnect(sk, flags); 572 573 if (!inet_sk(sk)->inet_num && inet_autobind(sk)) 574 return -EAGAIN; 575 return sk->sk_prot->connect(sk, uaddr, addr_len); 576} 577EXPORT_SYMBOL(inet_dgram_connect); 578 579static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias) 580{ 581 DEFINE_WAIT(wait); 582 583 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 584 sk->sk_write_pending += writebias; 585 586 /* Basic assumption: if someone sets sk->sk_err, he _must_ 587 * change state of the socket from TCP_SYN_*. 588 * Connect() does not allow to get error notifications 589 * without closing the socket. 590 */ 591 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 592 release_sock(sk); 593 timeo = schedule_timeout(timeo); 594 lock_sock(sk); 595 if (signal_pending(current) || !timeo) 596 break; 597 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 598 } 599 finish_wait(sk_sleep(sk), &wait); 600 sk->sk_write_pending -= writebias; 601 return timeo; 602} 603 604/* 605 * Connect to a remote host. There is regrettably still a little 606 * TCP 'magic' in here. 607 */ 608int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 609 int addr_len, int flags) 610{ 611 struct sock *sk = sock->sk; 612 int err; 613 long timeo; 614 615 if (addr_len < sizeof(uaddr->sa_family)) 616 return -EINVAL; 617 618 if (uaddr->sa_family == AF_UNSPEC) { 619 err = sk->sk_prot->disconnect(sk, flags); 620 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 621 goto out; 622 } 623 624 switch (sock->state) { 625 default: 626 err = -EINVAL; 627 goto out; 628 case SS_CONNECTED: 629 err = -EISCONN; 630 goto out; 631 case SS_CONNECTING: 632 err = -EALREADY; 633 /* Fall out of switch with err, set for this state */ 634 break; 635 case SS_UNCONNECTED: 636 err = -EISCONN; 637 if (sk->sk_state != TCP_CLOSE) 638 goto out; 639 640 err = sk->sk_prot->connect(sk, uaddr, addr_len); 641 if (err < 0) 642 goto out; 643 644 sock->state = SS_CONNECTING; 645 646 /* Just entered SS_CONNECTING state; the only 647 * difference is that return value in non-blocking 648 * case is EINPROGRESS, rather than EALREADY. 649 */ 650 err = -EINPROGRESS; 651 break; 652 } 653 654 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 655 656 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 657 int writebias = (sk->sk_protocol == IPPROTO_TCP) && 658 tcp_sk(sk)->fastopen_req && 659 tcp_sk(sk)->fastopen_req->data ? 1 : 0; 660 661 /* Error code is set above */ 662 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias)) 663 goto out; 664 665 err = sock_intr_errno(timeo); 666 if (signal_pending(current)) 667 goto out; 668 } 669 670 /* Connection was closed by RST, timeout, ICMP error 671 * or another process disconnected us. 672 */ 673 if (sk->sk_state == TCP_CLOSE) 674 goto sock_error; 675 676 /* sk->sk_err may be not zero now, if RECVERR was ordered by user 677 * and error was received after socket entered established state. 678 * Hence, it is handled normally after connect() return successfully. 679 */ 680 681 sock->state = SS_CONNECTED; 682 err = 0; 683out: 684 return err; 685 686sock_error: 687 err = sock_error(sk) ? : -ECONNABORTED; 688 sock->state = SS_UNCONNECTED; 689 if (sk->sk_prot->disconnect(sk, flags)) 690 sock->state = SS_DISCONNECTING; 691 goto out; 692} 693EXPORT_SYMBOL(__inet_stream_connect); 694 695int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 696 int addr_len, int flags) 697{ 698 int err; 699 700 lock_sock(sock->sk); 701 err = __inet_stream_connect(sock, uaddr, addr_len, flags); 702 release_sock(sock->sk); 703 return err; 704} 705EXPORT_SYMBOL(inet_stream_connect); 706 707/* 708 * Accept a pending connection. The TCP layer now gives BSD semantics. 709 */ 710 711int inet_accept(struct socket *sock, struct socket *newsock, int flags) 712{ 713 struct sock *sk1 = sock->sk; 714 int err = -EINVAL; 715 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err); 716 717 if (!sk2) 718 goto do_err; 719 720 lock_sock(sk2); 721 722 sock_rps_record_flow(sk2); 723 WARN_ON(!((1 << sk2->sk_state) & 724 (TCPF_ESTABLISHED | TCPF_SYN_RECV | 725 TCPF_CLOSE_WAIT | TCPF_CLOSE))); 726 727 sock_graft(sk2, newsock); 728 729 newsock->state = SS_CONNECTED; 730 err = 0; 731 release_sock(sk2); 732do_err: 733 return err; 734} 735EXPORT_SYMBOL(inet_accept); 736 737 738/* 739 * This does both peername and sockname. 740 */ 741int inet_getname(struct socket *sock, struct sockaddr *uaddr, 742 int *uaddr_len, int peer) 743{ 744 struct sock *sk = sock->sk; 745 struct inet_sock *inet = inet_sk(sk); 746 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr); 747 748 sin->sin_family = AF_INET; 749 if (peer) { 750 if (!inet->inet_dport || 751 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 752 peer == 1)) 753 return -ENOTCONN; 754 sin->sin_port = inet->inet_dport; 755 sin->sin_addr.s_addr = inet->inet_daddr; 756 } else { 757 __be32 addr = inet->inet_rcv_saddr; 758 if (!addr) 759 addr = inet->inet_saddr; 760 sin->sin_port = inet->inet_sport; 761 sin->sin_addr.s_addr = addr; 762 } 763 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 764 *uaddr_len = sizeof(*sin); 765 return 0; 766} 767EXPORT_SYMBOL(inet_getname); 768 769int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 770 size_t size) 771{ 772 struct sock *sk = sock->sk; 773 774 sock_rps_record_flow(sk); 775 776 /* We may need to bind the socket. */ 777 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 778 inet_autobind(sk)) 779 return -EAGAIN; 780 781 return sk->sk_prot->sendmsg(iocb, sk, msg, size); 782} 783EXPORT_SYMBOL(inet_sendmsg); 784 785ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, 786 size_t size, int flags) 787{ 788 struct sock *sk = sock->sk; 789 790 sock_rps_record_flow(sk); 791 792 /* We may need to bind the socket. */ 793 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 794 inet_autobind(sk)) 795 return -EAGAIN; 796 797 if (sk->sk_prot->sendpage) 798 return sk->sk_prot->sendpage(sk, page, offset, size, flags); 799 return sock_no_sendpage(sock, page, offset, size, flags); 800} 801EXPORT_SYMBOL(inet_sendpage); 802 803int inet_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 804 size_t size, int flags) 805{ 806 struct sock *sk = sock->sk; 807 int addr_len = 0; 808 int err; 809 810 sock_rps_record_flow(sk); 811 812 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, 813 flags & ~MSG_DONTWAIT, &addr_len); 814 if (err >= 0) 815 msg->msg_namelen = addr_len; 816 return err; 817} 818EXPORT_SYMBOL(inet_recvmsg); 819 820int inet_shutdown(struct socket *sock, int how) 821{ 822 struct sock *sk = sock->sk; 823 int err = 0; 824 825 /* This should really check to make sure 826 * the socket is a TCP socket. (WHY AC...) 827 */ 828 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and 829 1->2 bit 2 snds. 830 2->3 */ 831 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ 832 return -EINVAL; 833 834 lock_sock(sk); 835 if (sock->state == SS_CONNECTING) { 836 if ((1 << sk->sk_state) & 837 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) 838 sock->state = SS_DISCONNECTING; 839 else 840 sock->state = SS_CONNECTED; 841 } 842 843 switch (sk->sk_state) { 844 case TCP_CLOSE: 845 err = -ENOTCONN; 846 /* Hack to wake up other listeners, who can poll for 847 POLLHUP, even on eg. unconnected UDP sockets -- RR */ 848 default: 849 sk->sk_shutdown |= how; 850 if (sk->sk_prot->shutdown) 851 sk->sk_prot->shutdown(sk, how); 852 break; 853 854 /* Remaining two branches are temporary solution for missing 855 * close() in multithreaded environment. It is _not_ a good idea, 856 * but we have no choice until close() is repaired at VFS level. 857 */ 858 case TCP_LISTEN: 859 if (!(how & RCV_SHUTDOWN)) 860 break; 861 /* Fall through */ 862 case TCP_SYN_SENT: 863 err = sk->sk_prot->disconnect(sk, O_NONBLOCK); 864 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 865 break; 866 } 867 868 /* Wake up anyone sleeping in poll. */ 869 sk->sk_state_change(sk); 870 release_sock(sk); 871 return err; 872} 873EXPORT_SYMBOL(inet_shutdown); 874 875/* 876 * ioctl() calls you can issue on an INET socket. Most of these are 877 * device configuration and stuff and very rarely used. Some ioctls 878 * pass on to the socket itself. 879 * 880 * NOTE: I like the idea of a module for the config stuff. ie ifconfig 881 * loads the devconfigure module does its configuring and unloads it. 882 * There's a good 20K of config code hanging around the kernel. 883 */ 884 885int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 886{ 887 struct sock *sk = sock->sk; 888 int err = 0; 889 struct net *net = sock_net(sk); 890 891 switch (cmd) { 892 case SIOCGSTAMP: 893 err = sock_get_timestamp(sk, (struct timeval __user *)arg); 894 break; 895 case SIOCGSTAMPNS: 896 err = sock_get_timestampns(sk, (struct timespec __user *)arg); 897 break; 898 case SIOCADDRT: 899 case SIOCDELRT: 900 case SIOCRTMSG: 901 err = ip_rt_ioctl(net, cmd, (void __user *)arg); 902 break; 903 case SIOCDARP: 904 case SIOCGARP: 905 case SIOCSARP: 906 err = arp_ioctl(net, cmd, (void __user *)arg); 907 break; 908 case SIOCGIFADDR: 909 case SIOCSIFADDR: 910 case SIOCGIFBRDADDR: 911 case SIOCSIFBRDADDR: 912 case SIOCGIFNETMASK: 913 case SIOCSIFNETMASK: 914 case SIOCGIFDSTADDR: 915 case SIOCSIFDSTADDR: 916 case SIOCSIFPFLAGS: 917 case SIOCGIFPFLAGS: 918 case SIOCSIFFLAGS: 919 err = devinet_ioctl(net, cmd, (void __user *)arg); 920 break; 921 default: 922 if (sk->sk_prot->ioctl) 923 err = sk->sk_prot->ioctl(sk, cmd, arg); 924 else 925 err = -ENOIOCTLCMD; 926 break; 927 } 928 return err; 929} 930EXPORT_SYMBOL(inet_ioctl); 931 932#ifdef CONFIG_COMPAT 933static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 934{ 935 struct sock *sk = sock->sk; 936 int err = -ENOIOCTLCMD; 937 938 if (sk->sk_prot->compat_ioctl) 939 err = sk->sk_prot->compat_ioctl(sk, cmd, arg); 940 941 return err; 942} 943#endif 944 945const struct proto_ops inet_stream_ops = { 946 .family = PF_INET, 947 .owner = THIS_MODULE, 948 .release = inet_release, 949 .bind = inet_bind, 950 .connect = inet_stream_connect, 951 .socketpair = sock_no_socketpair, 952 .accept = inet_accept, 953 .getname = inet_getname, 954 .poll = tcp_poll, 955 .ioctl = inet_ioctl, 956 .listen = inet_listen, 957 .shutdown = inet_shutdown, 958 .setsockopt = sock_common_setsockopt, 959 .getsockopt = sock_common_getsockopt, 960 .sendmsg = inet_sendmsg, 961 .recvmsg = inet_recvmsg, 962 .mmap = sock_no_mmap, 963 .sendpage = inet_sendpage, 964 .splice_read = tcp_splice_read, 965#ifdef CONFIG_COMPAT 966 .compat_setsockopt = compat_sock_common_setsockopt, 967 .compat_getsockopt = compat_sock_common_getsockopt, 968 .compat_ioctl = inet_compat_ioctl, 969#endif 970}; 971EXPORT_SYMBOL(inet_stream_ops); 972 973const struct proto_ops inet_dgram_ops = { 974 .family = PF_INET, 975 .owner = THIS_MODULE, 976 .release = inet_release, 977 .bind = inet_bind, 978 .connect = inet_dgram_connect, 979 .socketpair = sock_no_socketpair, 980 .accept = sock_no_accept, 981 .getname = inet_getname, 982 .poll = udp_poll, 983 .ioctl = inet_ioctl, 984 .listen = sock_no_listen, 985 .shutdown = inet_shutdown, 986 .setsockopt = sock_common_setsockopt, 987 .getsockopt = sock_common_getsockopt, 988 .sendmsg = inet_sendmsg, 989 .recvmsg = inet_recvmsg, 990 .mmap = sock_no_mmap, 991 .sendpage = inet_sendpage, 992#ifdef CONFIG_COMPAT 993 .compat_setsockopt = compat_sock_common_setsockopt, 994 .compat_getsockopt = compat_sock_common_getsockopt, 995 .compat_ioctl = inet_compat_ioctl, 996#endif 997}; 998EXPORT_SYMBOL(inet_dgram_ops); 999 1000/* 1001 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 1002 * udp_poll 1003 */ 1004static const struct proto_ops inet_sockraw_ops = { 1005 .family = PF_INET, 1006 .owner = THIS_MODULE, 1007 .release = inet_release, 1008 .bind = inet_bind, 1009 .connect = inet_dgram_connect, 1010 .socketpair = sock_no_socketpair, 1011 .accept = sock_no_accept, 1012 .getname = inet_getname, 1013 .poll = datagram_poll, 1014 .ioctl = inet_ioctl, 1015 .listen = sock_no_listen, 1016 .shutdown = inet_shutdown, 1017 .setsockopt = sock_common_setsockopt, 1018 .getsockopt = sock_common_getsockopt, 1019 .sendmsg = inet_sendmsg, 1020 .recvmsg = inet_recvmsg, 1021 .mmap = sock_no_mmap, 1022 .sendpage = inet_sendpage, 1023#ifdef CONFIG_COMPAT 1024 .compat_setsockopt = compat_sock_common_setsockopt, 1025 .compat_getsockopt = compat_sock_common_getsockopt, 1026 .compat_ioctl = inet_compat_ioctl, 1027#endif 1028}; 1029 1030static const struct net_proto_family inet_family_ops = { 1031 .family = PF_INET, 1032 .create = inet_create, 1033 .owner = THIS_MODULE, 1034}; 1035 1036/* Upon startup we insert all the elements in inetsw_array[] into 1037 * the linked list inetsw. 1038 */ 1039static struct inet_protosw inetsw_array[] = 1040{ 1041 { 1042 .type = SOCK_STREAM, 1043 .protocol = IPPROTO_TCP, 1044 .prot = &tcp_prot, 1045 .ops = &inet_stream_ops, 1046 .no_check = 0, 1047 .flags = INET_PROTOSW_PERMANENT | 1048 INET_PROTOSW_ICSK, 1049 }, 1050 1051 { 1052 .type = SOCK_DGRAM, 1053 .protocol = IPPROTO_UDP, 1054 .prot = &udp_prot, 1055 .ops = &inet_dgram_ops, 1056 .no_check = UDP_CSUM_DEFAULT, 1057 .flags = INET_PROTOSW_PERMANENT, 1058 }, 1059 1060 { 1061 .type = SOCK_DGRAM, 1062 .protocol = IPPROTO_ICMP, 1063 .prot = &ping_prot, 1064 .ops = &inet_dgram_ops, 1065 .no_check = UDP_CSUM_DEFAULT, 1066 .flags = INET_PROTOSW_REUSE, 1067 }, 1068 1069 { 1070 .type = SOCK_RAW, 1071 .protocol = IPPROTO_IP, /* wild card */ 1072 .prot = &raw_prot, 1073 .ops = &inet_sockraw_ops, 1074 .no_check = UDP_CSUM_DEFAULT, 1075 .flags = INET_PROTOSW_REUSE, 1076 } 1077}; 1078 1079#define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) 1080 1081void inet_register_protosw(struct inet_protosw *p) 1082{ 1083 struct list_head *lh; 1084 struct inet_protosw *answer; 1085 int protocol = p->protocol; 1086 struct list_head *last_perm; 1087 1088 spin_lock_bh(&inetsw_lock); 1089 1090 if (p->type >= SOCK_MAX) 1091 goto out_illegal; 1092 1093 /* If we are trying to override a permanent protocol, bail. */ 1094 answer = NULL; 1095 last_perm = &inetsw[p->type]; 1096 list_for_each(lh, &inetsw[p->type]) { 1097 answer = list_entry(lh, struct inet_protosw, list); 1098 1099 /* Check only the non-wild match. */ 1100 if (INET_PROTOSW_PERMANENT & answer->flags) { 1101 if (protocol == answer->protocol) 1102 break; 1103 last_perm = lh; 1104 } 1105 1106 answer = NULL; 1107 } 1108 if (answer) 1109 goto out_permanent; 1110 1111 /* Add the new entry after the last permanent entry if any, so that 1112 * the new entry does not override a permanent entry when matched with 1113 * a wild-card protocol. But it is allowed to override any existing 1114 * non-permanent entry. This means that when we remove this entry, the 1115 * system automatically returns to the old behavior. 1116 */ 1117 list_add_rcu(&p->list, last_perm); 1118out: 1119 spin_unlock_bh(&inetsw_lock); 1120 1121 return; 1122 1123out_permanent: 1124 pr_err("Attempt to override permanent protocol %d\n", protocol); 1125 goto out; 1126 1127out_illegal: 1128 pr_err("Ignoring attempt to register invalid socket type %d\n", 1129 p->type); 1130 goto out; 1131} 1132EXPORT_SYMBOL(inet_register_protosw); 1133 1134void inet_unregister_protosw(struct inet_protosw *p) 1135{ 1136 if (INET_PROTOSW_PERMANENT & p->flags) { 1137 pr_err("Attempt to unregister permanent protocol %d\n", 1138 p->protocol); 1139 } else { 1140 spin_lock_bh(&inetsw_lock); 1141 list_del_rcu(&p->list); 1142 spin_unlock_bh(&inetsw_lock); 1143 1144 synchronize_net(); 1145 } 1146} 1147EXPORT_SYMBOL(inet_unregister_protosw); 1148 1149/* 1150 * Shall we try to damage output packets if routing dev changes? 1151 */ 1152 1153int sysctl_ip_dynaddr __read_mostly; 1154 1155static int inet_sk_reselect_saddr(struct sock *sk) 1156{ 1157 struct inet_sock *inet = inet_sk(sk); 1158 __be32 old_saddr = inet->inet_saddr; 1159 __be32 daddr = inet->inet_daddr; 1160 struct flowi4 *fl4; 1161 struct rtable *rt; 1162 __be32 new_saddr; 1163 struct ip_options_rcu *inet_opt; 1164 1165 inet_opt = rcu_dereference_protected(inet->inet_opt, 1166 sock_owned_by_user(sk)); 1167 if (inet_opt && inet_opt->opt.srr) 1168 daddr = inet_opt->opt.faddr; 1169 1170 /* Query new route. */ 1171 fl4 = &inet->cork.fl.u.ip4; 1172 rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk), 1173 sk->sk_bound_dev_if, sk->sk_protocol, 1174 inet->inet_sport, inet->inet_dport, sk, false); 1175 if (IS_ERR(rt)) 1176 return PTR_ERR(rt); 1177 1178 sk_setup_caps(sk, &rt->dst); 1179 1180 new_saddr = fl4->saddr; 1181 1182 if (new_saddr == old_saddr) 1183 return 0; 1184 1185 if (sysctl_ip_dynaddr > 1) { 1186 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n", 1187 __func__, &old_saddr, &new_saddr); 1188 } 1189 1190 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr; 1191 1192 /* 1193 * XXX The only one ugly spot where we need to 1194 * XXX really change the sockets identity after 1195 * XXX it has entered the hashes. -DaveM 1196 * 1197 * Besides that, it does not check for connection 1198 * uniqueness. Wait for troubles. 1199 */ 1200 __sk_prot_rehash(sk); 1201 return 0; 1202} 1203 1204int inet_sk_rebuild_header(struct sock *sk) 1205{ 1206 struct inet_sock *inet = inet_sk(sk); 1207 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); 1208 __be32 daddr; 1209 struct ip_options_rcu *inet_opt; 1210 struct flowi4 *fl4; 1211 int err; 1212 1213 /* Route is OK, nothing to do. */ 1214 if (rt) 1215 return 0; 1216 1217 /* Reroute. */ 1218 rcu_read_lock(); 1219 inet_opt = rcu_dereference(inet->inet_opt); 1220 daddr = inet->inet_daddr; 1221 if (inet_opt && inet_opt->opt.srr) 1222 daddr = inet_opt->opt.faddr; 1223 rcu_read_unlock(); 1224 fl4 = &inet->cork.fl.u.ip4; 1225 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr, 1226 inet->inet_dport, inet->inet_sport, 1227 sk->sk_protocol, RT_CONN_FLAGS(sk), 1228 sk->sk_bound_dev_if); 1229 if (!IS_ERR(rt)) { 1230 err = 0; 1231 sk_setup_caps(sk, &rt->dst); 1232 } else { 1233 err = PTR_ERR(rt); 1234 1235 /* Routing failed... */ 1236 sk->sk_route_caps = 0; 1237 /* 1238 * Other protocols have to map its equivalent state to TCP_SYN_SENT. 1239 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme 1240 */ 1241 if (!sysctl_ip_dynaddr || 1242 sk->sk_state != TCP_SYN_SENT || 1243 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 1244 (err = inet_sk_reselect_saddr(sk)) != 0) 1245 sk->sk_err_soft = -err; 1246 } 1247 1248 return err; 1249} 1250EXPORT_SYMBOL(inet_sk_rebuild_header); 1251 1252static int inet_gso_send_check(struct sk_buff *skb) 1253{ 1254 const struct net_protocol *ops; 1255 const struct iphdr *iph; 1256 int proto; 1257 int ihl; 1258 int err = -EINVAL; 1259 1260 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1261 goto out; 1262 1263 iph = ip_hdr(skb); 1264 ihl = iph->ihl * 4; 1265 if (ihl < sizeof(*iph)) 1266 goto out; 1267 1268 if (unlikely(!pskb_may_pull(skb, ihl))) 1269 goto out; 1270 1271 __skb_pull(skb, ihl); 1272 skb_reset_transport_header(skb); 1273 iph = ip_hdr(skb); 1274 proto = iph->protocol; 1275 err = -EPROTONOSUPPORT; 1276 1277 rcu_read_lock(); 1278 ops = rcu_dereference(inet_protos[proto]); 1279 if (likely(ops && ops->gso_send_check)) 1280 err = ops->gso_send_check(skb); 1281 rcu_read_unlock(); 1282 1283out: 1284 return err; 1285} 1286 1287static struct sk_buff *inet_gso_segment(struct sk_buff *skb, 1288 netdev_features_t features) 1289{ 1290 struct sk_buff *segs = ERR_PTR(-EINVAL); 1291 const struct net_protocol *ops; 1292 struct iphdr *iph; 1293 int proto; 1294 int ihl; 1295 int id; 1296 unsigned int offset = 0; 1297 1298 if (!(features & NETIF_F_V4_CSUM)) 1299 features &= ~NETIF_F_SG; 1300 1301 if (unlikely(skb_shinfo(skb)->gso_type & 1302 ~(SKB_GSO_TCPV4 | 1303 SKB_GSO_UDP | 1304 SKB_GSO_DODGY | 1305 SKB_GSO_TCP_ECN | 1306 0))) 1307 goto out; 1308 1309 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1310 goto out; 1311 1312 iph = ip_hdr(skb); 1313 ihl = iph->ihl * 4; 1314 if (ihl < sizeof(*iph)) 1315 goto out; 1316 1317 if (unlikely(!pskb_may_pull(skb, ihl))) 1318 goto out; 1319 1320 __skb_pull(skb, ihl); 1321 skb_reset_transport_header(skb); 1322 iph = ip_hdr(skb); 1323 id = ntohs(iph->id); 1324 proto = iph->protocol; 1325 segs = ERR_PTR(-EPROTONOSUPPORT); 1326 1327 rcu_read_lock(); 1328 ops = rcu_dereference(inet_protos[proto]); 1329 if (likely(ops && ops->gso_segment)) 1330 segs = ops->gso_segment(skb, features); 1331 rcu_read_unlock(); 1332 1333 if (!segs || IS_ERR(segs)) 1334 goto out; 1335 1336 skb = segs; 1337 do { 1338 iph = ip_hdr(skb); 1339 if (proto == IPPROTO_UDP) { 1340 iph->id = htons(id); 1341 iph->frag_off = htons(offset >> 3); 1342 if (skb->next != NULL) 1343 iph->frag_off |= htons(IP_MF); 1344 offset += (skb->len - skb->mac_len - iph->ihl * 4); 1345 } else 1346 iph->id = htons(id++); 1347 iph->tot_len = htons(skb->len - skb->mac_len); 1348 iph->check = 0; 1349 iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl); 1350 } while ((skb = skb->next)); 1351 1352out: 1353 return segs; 1354} 1355 1356static struct sk_buff **inet_gro_receive(struct sk_buff **head, 1357 struct sk_buff *skb) 1358{ 1359 const struct net_protocol *ops; 1360 struct sk_buff **pp = NULL; 1361 struct sk_buff *p; 1362 const struct iphdr *iph; 1363 unsigned int hlen; 1364 unsigned int off; 1365 unsigned int id; 1366 int flush = 1; 1367 int proto; 1368 1369 off = skb_gro_offset(skb); 1370 hlen = off + sizeof(*iph); 1371 iph = skb_gro_header_fast(skb, off); 1372 if (skb_gro_header_hard(skb, hlen)) { 1373 iph = skb_gro_header_slow(skb, hlen, off); 1374 if (unlikely(!iph)) 1375 goto out; 1376 } 1377 1378 proto = iph->protocol; 1379 1380 rcu_read_lock(); 1381 ops = rcu_dereference(inet_protos[proto]); 1382 if (!ops || !ops->gro_receive) 1383 goto out_unlock; 1384 1385 if (*(u8 *)iph != 0x45) 1386 goto out_unlock; 1387 1388 if (unlikely(ip_fast_csum((u8 *)iph, 5))) 1389 goto out_unlock; 1390 1391 id = ntohl(*(__be32 *)&iph->id); 1392 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id ^ IP_DF)); 1393 id >>= 16; 1394 1395 for (p = *head; p; p = p->next) { 1396 struct iphdr *iph2; 1397 1398 if (!NAPI_GRO_CB(p)->same_flow) 1399 continue; 1400 1401 iph2 = ip_hdr(p); 1402 1403 if ((iph->protocol ^ iph2->protocol) | 1404 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) | 1405 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) { 1406 NAPI_GRO_CB(p)->same_flow = 0; 1407 continue; 1408 } 1409 1410 /* All fields must match except length and checksum. */ 1411 NAPI_GRO_CB(p)->flush |= 1412 (iph->ttl ^ iph2->ttl) | 1413 (iph->tos ^ iph2->tos) | 1414 ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id); 1415 1416 NAPI_GRO_CB(p)->flush |= flush; 1417 } 1418 1419 NAPI_GRO_CB(skb)->flush |= flush; 1420 skb_gro_pull(skb, sizeof(*iph)); 1421 skb_set_transport_header(skb, skb_gro_offset(skb)); 1422 1423 pp = ops->gro_receive(head, skb); 1424 1425out_unlock: 1426 rcu_read_unlock(); 1427 1428out: 1429 NAPI_GRO_CB(skb)->flush |= flush; 1430 1431 return pp; 1432} 1433 1434static int inet_gro_complete(struct sk_buff *skb) 1435{ 1436 __be16 newlen = htons(skb->len - skb_network_offset(skb)); 1437 struct iphdr *iph = ip_hdr(skb); 1438 const struct net_protocol *ops; 1439 int proto = iph->protocol; 1440 int err = -ENOSYS; 1441 1442 csum_replace2(&iph->check, iph->tot_len, newlen); 1443 iph->tot_len = newlen; 1444 1445 rcu_read_lock(); 1446 ops = rcu_dereference(inet_protos[proto]); 1447 if (WARN_ON(!ops || !ops->gro_complete)) 1448 goto out_unlock; 1449 1450 err = ops->gro_complete(skb); 1451 1452out_unlock: 1453 rcu_read_unlock(); 1454 1455 return err; 1456} 1457 1458int inet_ctl_sock_create(struct sock **sk, unsigned short family, 1459 unsigned short type, unsigned char protocol, 1460 struct net *net) 1461{ 1462 struct socket *sock; 1463 int rc = sock_create_kern(family, type, protocol, &sock); 1464 1465 if (rc == 0) { 1466 *sk = sock->sk; 1467 (*sk)->sk_allocation = GFP_ATOMIC; 1468 /* 1469 * Unhash it so that IP input processing does not even see it, 1470 * we do not wish this socket to see incoming packets. 1471 */ 1472 (*sk)->sk_prot->unhash(*sk); 1473 1474 sk_change_net(*sk, net); 1475 } 1476 return rc; 1477} 1478EXPORT_SYMBOL_GPL(inet_ctl_sock_create); 1479 1480unsigned long snmp_fold_field(void __percpu *mib[], int offt) 1481{ 1482 unsigned long res = 0; 1483 int i, j; 1484 1485 for_each_possible_cpu(i) { 1486 for (j = 0; j < SNMP_ARRAY_SZ; j++) 1487 res += *(((unsigned long *) per_cpu_ptr(mib[j], i)) + offt); 1488 } 1489 return res; 1490} 1491EXPORT_SYMBOL_GPL(snmp_fold_field); 1492 1493#if BITS_PER_LONG==32 1494 1495u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t syncp_offset) 1496{ 1497 u64 res = 0; 1498 int cpu; 1499 1500 for_each_possible_cpu(cpu) { 1501 void *bhptr; 1502 struct u64_stats_sync *syncp; 1503 u64 v; 1504 unsigned int start; 1505 1506 bhptr = per_cpu_ptr(mib[0], cpu); 1507 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset); 1508 do { 1509 start = u64_stats_fetch_begin_bh(syncp); 1510 v = *(((u64 *) bhptr) + offt); 1511 } while (u64_stats_fetch_retry_bh(syncp, start)); 1512 1513 res += v; 1514 } 1515 return res; 1516} 1517EXPORT_SYMBOL_GPL(snmp_fold_field64); 1518#endif 1519 1520int snmp_mib_init(void __percpu *ptr[2], size_t mibsize, size_t align) 1521{ 1522 BUG_ON(ptr == NULL); 1523 ptr[0] = __alloc_percpu(mibsize, align); 1524 if (!ptr[0]) 1525 return -ENOMEM; 1526#if SNMP_ARRAY_SZ == 2 1527 ptr[1] = __alloc_percpu(mibsize, align); 1528 if (!ptr[1]) { 1529 free_percpu(ptr[0]); 1530 ptr[0] = NULL; 1531 return -ENOMEM; 1532 } 1533#endif 1534 return 0; 1535} 1536EXPORT_SYMBOL_GPL(snmp_mib_init); 1537 1538void snmp_mib_free(void __percpu *ptr[SNMP_ARRAY_SZ]) 1539{ 1540 int i; 1541 1542 BUG_ON(ptr == NULL); 1543 for (i = 0; i < SNMP_ARRAY_SZ; i++) { 1544 free_percpu(ptr[i]); 1545 ptr[i] = NULL; 1546 } 1547} 1548EXPORT_SYMBOL_GPL(snmp_mib_free); 1549 1550#ifdef CONFIG_IP_MULTICAST 1551static const struct net_protocol igmp_protocol = { 1552 .handler = igmp_rcv, 1553 .netns_ok = 1, 1554}; 1555#endif 1556 1557static const struct net_protocol tcp_protocol = { 1558 .early_demux = tcp_v4_early_demux, 1559 .handler = tcp_v4_rcv, 1560 .err_handler = tcp_v4_err, 1561 .gso_send_check = tcp_v4_gso_send_check, 1562 .gso_segment = tcp_tso_segment, 1563 .gro_receive = tcp4_gro_receive, 1564 .gro_complete = tcp4_gro_complete, 1565 .no_policy = 1, 1566 .netns_ok = 1, 1567}; 1568 1569static const struct net_protocol udp_protocol = { 1570 .handler = udp_rcv, 1571 .err_handler = udp_err, 1572 .gso_send_check = udp4_ufo_send_check, 1573 .gso_segment = udp4_ufo_fragment, 1574 .no_policy = 1, 1575 .netns_ok = 1, 1576}; 1577 1578static const struct net_protocol icmp_protocol = { 1579 .handler = icmp_rcv, 1580 .err_handler = ping_err, 1581 .no_policy = 1, 1582 .netns_ok = 1, 1583}; 1584 1585static __net_init int ipv4_mib_init_net(struct net *net) 1586{ 1587 if (snmp_mib_init((void __percpu **)net->mib.tcp_statistics, 1588 sizeof(struct tcp_mib), 1589 __alignof__(struct tcp_mib)) < 0) 1590 goto err_tcp_mib; 1591 if (snmp_mib_init((void __percpu **)net->mib.ip_statistics, 1592 sizeof(struct ipstats_mib), 1593 __alignof__(struct ipstats_mib)) < 0) 1594 goto err_ip_mib; 1595 if (snmp_mib_init((void __percpu **)net->mib.net_statistics, 1596 sizeof(struct linux_mib), 1597 __alignof__(struct linux_mib)) < 0) 1598 goto err_net_mib; 1599 if (snmp_mib_init((void __percpu **)net->mib.udp_statistics, 1600 sizeof(struct udp_mib), 1601 __alignof__(struct udp_mib)) < 0) 1602 goto err_udp_mib; 1603 if (snmp_mib_init((void __percpu **)net->mib.udplite_statistics, 1604 sizeof(struct udp_mib), 1605 __alignof__(struct udp_mib)) < 0) 1606 goto err_udplite_mib; 1607 if (snmp_mib_init((void __percpu **)net->mib.icmp_statistics, 1608 sizeof(struct icmp_mib), 1609 __alignof__(struct icmp_mib)) < 0) 1610 goto err_icmp_mib; 1611 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib), 1612 GFP_KERNEL); 1613 if (!net->mib.icmpmsg_statistics) 1614 goto err_icmpmsg_mib; 1615 1616 tcp_mib_init(net); 1617 return 0; 1618 1619err_icmpmsg_mib: 1620 snmp_mib_free((void __percpu **)net->mib.icmp_statistics); 1621err_icmp_mib: 1622 snmp_mib_free((void __percpu **)net->mib.udplite_statistics); 1623err_udplite_mib: 1624 snmp_mib_free((void __percpu **)net->mib.udp_statistics); 1625err_udp_mib: 1626 snmp_mib_free((void __percpu **)net->mib.net_statistics); 1627err_net_mib: 1628 snmp_mib_free((void __percpu **)net->mib.ip_statistics); 1629err_ip_mib: 1630 snmp_mib_free((void __percpu **)net->mib.tcp_statistics); 1631err_tcp_mib: 1632 return -ENOMEM; 1633} 1634 1635static __net_exit void ipv4_mib_exit_net(struct net *net) 1636{ 1637 kfree(net->mib.icmpmsg_statistics); 1638 snmp_mib_free((void __percpu **)net->mib.icmp_statistics); 1639 snmp_mib_free((void __percpu **)net->mib.udplite_statistics); 1640 snmp_mib_free((void __percpu **)net->mib.udp_statistics); 1641 snmp_mib_free((void __percpu **)net->mib.net_statistics); 1642 snmp_mib_free((void __percpu **)net->mib.ip_statistics); 1643 snmp_mib_free((void __percpu **)net->mib.tcp_statistics); 1644} 1645 1646static __net_initdata struct pernet_operations ipv4_mib_ops = { 1647 .init = ipv4_mib_init_net, 1648 .exit = ipv4_mib_exit_net, 1649}; 1650 1651static int __init init_ipv4_mibs(void) 1652{ 1653 return register_pernet_subsys(&ipv4_mib_ops); 1654} 1655 1656static int ipv4_proc_init(void); 1657 1658/* 1659 * IP protocol layer initialiser 1660 */ 1661 1662static struct packet_type ip_packet_type __read_mostly = { 1663 .type = cpu_to_be16(ETH_P_IP), 1664 .func = ip_rcv, 1665}; 1666 1667static struct packet_offload ip_packet_offload __read_mostly = { 1668 .type = cpu_to_be16(ETH_P_IP), 1669 .gso_send_check = inet_gso_send_check, 1670 .gso_segment = inet_gso_segment, 1671 .gro_receive = inet_gro_receive, 1672 .gro_complete = inet_gro_complete, 1673}; 1674 1675static int __init inet_init(void) 1676{ 1677 struct sk_buff *dummy_skb; 1678 struct inet_protosw *q; 1679 struct list_head *r; 1680 int rc = -EINVAL; 1681 1682 BUILD_BUG_ON(sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb)); 1683 1684 sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL); 1685 if (!sysctl_local_reserved_ports) 1686 goto out; 1687 1688 rc = proto_register(&tcp_prot, 1); 1689 if (rc) 1690 goto out_free_reserved_ports; 1691 1692 rc = proto_register(&udp_prot, 1); 1693 if (rc) 1694 goto out_unregister_tcp_proto; 1695 1696 rc = proto_register(&raw_prot, 1); 1697 if (rc) 1698 goto out_unregister_udp_proto; 1699 1700 rc = proto_register(&ping_prot, 1); 1701 if (rc) 1702 goto out_unregister_raw_proto; 1703 1704 /* 1705 * Tell SOCKET that we are alive... 1706 */ 1707 1708 (void)sock_register(&inet_family_ops); 1709 1710#ifdef CONFIG_SYSCTL 1711 ip_static_sysctl_init(); 1712#endif 1713 1714 tcp_prot.sysctl_mem = init_net.ipv4.sysctl_tcp_mem; 1715 1716 /* 1717 * Add all the base protocols. 1718 */ 1719 1720 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 1721 pr_crit("%s: Cannot add ICMP protocol\n", __func__); 1722 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) 1723 pr_crit("%s: Cannot add UDP protocol\n", __func__); 1724 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) 1725 pr_crit("%s: Cannot add TCP protocol\n", __func__); 1726#ifdef CONFIG_IP_MULTICAST 1727 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 1728 pr_crit("%s: Cannot add IGMP protocol\n", __func__); 1729#endif 1730 1731 /* Register the socket-side information for inet_create. */ 1732 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 1733 INIT_LIST_HEAD(r); 1734 1735 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 1736 inet_register_protosw(q); 1737 1738 /* 1739 * Set the ARP module up 1740 */ 1741 1742 arp_init(); 1743 1744 /* 1745 * Set the IP module up 1746 */ 1747 1748 ip_init(); 1749 1750 tcp_v4_init(); 1751 1752 /* Setup TCP slab cache for open requests. */ 1753 tcp_init(); 1754 1755 /* Setup UDP memory threshold */ 1756 udp_init(); 1757 1758 /* Add UDP-Lite (RFC 3828) */ 1759 udplite4_register(); 1760 1761 ping_init(); 1762 1763 /* 1764 * Set the ICMP layer up 1765 */ 1766 1767 if (icmp_init() < 0) 1768 panic("Failed to create the ICMP control socket.\n"); 1769 1770 /* 1771 * Initialise the multicast router 1772 */ 1773#if defined(CONFIG_IP_MROUTE) 1774 if (ip_mr_init()) 1775 pr_crit("%s: Cannot init ipv4 mroute\n", __func__); 1776#endif 1777 /* 1778 * Initialise per-cpu ipv4 mibs 1779 */ 1780 1781 if (init_ipv4_mibs()) 1782 pr_crit("%s: Cannot init ipv4 mibs\n", __func__); 1783 1784 ipv4_proc_init(); 1785 1786 ipfrag_init(); 1787 1788 dev_add_offload(&ip_packet_offload); 1789 dev_add_pack(&ip_packet_type); 1790 1791 rc = 0; 1792out: 1793 return rc; 1794out_unregister_raw_proto: 1795 proto_unregister(&raw_prot); 1796out_unregister_udp_proto: 1797 proto_unregister(&udp_prot); 1798out_unregister_tcp_proto: 1799 proto_unregister(&tcp_prot); 1800out_free_reserved_ports: 1801 kfree(sysctl_local_reserved_ports); 1802 goto out; 1803} 1804 1805fs_initcall(inet_init); 1806 1807/* ------------------------------------------------------------------------ */ 1808 1809#ifdef CONFIG_PROC_FS 1810static int __init ipv4_proc_init(void) 1811{ 1812 int rc = 0; 1813 1814 if (raw_proc_init()) 1815 goto out_raw; 1816 if (tcp4_proc_init()) 1817 goto out_tcp; 1818 if (udp4_proc_init()) 1819 goto out_udp; 1820 if (ping_proc_init()) 1821 goto out_ping; 1822 if (ip_misc_proc_init()) 1823 goto out_misc; 1824out: 1825 return rc; 1826out_misc: 1827 ping_proc_exit(); 1828out_ping: 1829 udp4_proc_exit(); 1830out_udp: 1831 tcp4_proc_exit(); 1832out_tcp: 1833 raw_proc_exit(); 1834out_raw: 1835 rc = -ENOMEM; 1836 goto out; 1837} 1838 1839#else /* CONFIG_PROC_FS */ 1840static int __init ipv4_proc_init(void) 1841{ 1842 return 0; 1843} 1844#endif /* CONFIG_PROC_FS */ 1845 1846MODULE_ALIAS_NETPROTO(PF_INET); 1847 1848