af_inet.c revision da5bab079f9b7d90ba234965a14914ace55e45e9
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/inet_common.h> 115#include <net/xfrm.h> 116#include <net/net_namespace.h> 117#include <net/secure_seq.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 251u32 ipv6_hash_secret __read_mostly; 252EXPORT_SYMBOL(ipv6_hash_secret); 253 254/* 255 * inet_ehash_secret must be set exactly once, and to a non nul value 256 * ipv6_hash_secret must be set exactly once. 257 */ 258void build_ehash_secret(void) 259{ 260 u32 rnd; 261 262 do { 263 get_random_bytes(&rnd, sizeof(rnd)); 264 } while (rnd == 0); 265 266 if (cmpxchg(&inet_ehash_secret, 0, rnd) == 0) { 267 get_random_bytes(&ipv6_hash_secret, sizeof(ipv6_hash_secret)); 268 net_secret_init(); 269 } 270} 271EXPORT_SYMBOL(build_ehash_secret); 272 273/* 274 * Create an inet socket. 275 */ 276 277static int inet_create(struct net *net, struct socket *sock, int protocol, 278 int kern) 279{ 280 struct sock *sk; 281 struct inet_protosw *answer; 282 struct inet_sock *inet; 283 struct proto *answer_prot; 284 unsigned char answer_flags; 285 char answer_no_check; 286 int try_loading_module = 0; 287 int err; 288 289 if (unlikely(!inet_ehash_secret)) 290 if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM) 291 build_ehash_secret(); 292 293 sock->state = SS_UNCONNECTED; 294 295 /* Look for the requested type/protocol pair. */ 296lookup_protocol: 297 err = -ESOCKTNOSUPPORT; 298 rcu_read_lock(); 299 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) { 300 301 err = 0; 302 /* Check the non-wild match. */ 303 if (protocol == answer->protocol) { 304 if (protocol != IPPROTO_IP) 305 break; 306 } else { 307 /* Check for the two wild cases. */ 308 if (IPPROTO_IP == protocol) { 309 protocol = answer->protocol; 310 break; 311 } 312 if (IPPROTO_IP == answer->protocol) 313 break; 314 } 315 err = -EPROTONOSUPPORT; 316 } 317 318 if (unlikely(err)) { 319 if (try_loading_module < 2) { 320 rcu_read_unlock(); 321 /* 322 * Be more specific, e.g. net-pf-2-proto-132-type-1 323 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) 324 */ 325 if (++try_loading_module == 1) 326 request_module("net-pf-%d-proto-%d-type-%d", 327 PF_INET, protocol, sock->type); 328 /* 329 * Fall back to generic, e.g. net-pf-2-proto-132 330 * (net-pf-PF_INET-proto-IPPROTO_SCTP) 331 */ 332 else 333 request_module("net-pf-%d-proto-%d", 334 PF_INET, protocol); 335 goto lookup_protocol; 336 } else 337 goto out_rcu_unlock; 338 } 339 340 err = -EPERM; 341 if (sock->type == SOCK_RAW && !kern && 342 !ns_capable(net->user_ns, CAP_NET_RAW)) 343 goto out_rcu_unlock; 344 345 sock->ops = answer->ops; 346 answer_prot = answer->prot; 347 answer_no_check = answer->no_check; 348 answer_flags = answer->flags; 349 rcu_read_unlock(); 350 351 WARN_ON(answer_prot->slab == NULL); 352 353 err = -ENOBUFS; 354 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot); 355 if (sk == NULL) 356 goto out; 357 358 err = 0; 359 sk->sk_no_check = answer_no_check; 360 if (INET_PROTOSW_REUSE & answer_flags) 361 sk->sk_reuse = SK_CAN_REUSE; 362 363 inet = inet_sk(sk); 364 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 365 366 inet->nodefrag = 0; 367 368 if (SOCK_RAW == sock->type) { 369 inet->inet_num = protocol; 370 if (IPPROTO_RAW == protocol) 371 inet->hdrincl = 1; 372 } 373 374 if (ipv4_config.no_pmtu_disc) 375 inet->pmtudisc = IP_PMTUDISC_DONT; 376 else 377 inet->pmtudisc = IP_PMTUDISC_WANT; 378 379 inet->inet_id = 0; 380 381 sock_init_data(sock, sk); 382 383 sk->sk_destruct = inet_sock_destruct; 384 sk->sk_protocol = protocol; 385 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 386 387 inet->uc_ttl = -1; 388 inet->mc_loop = 1; 389 inet->mc_ttl = 1; 390 inet->mc_all = 1; 391 inet->mc_index = 0; 392 inet->mc_list = NULL; 393 inet->rcv_tos = 0; 394 395 sk_refcnt_debug_inc(sk); 396 397 if (inet->inet_num) { 398 /* It assumes that any protocol which allows 399 * the user to assign a number at socket 400 * creation time automatically 401 * shares. 402 */ 403 inet->inet_sport = htons(inet->inet_num); 404 /* Add to protocol hash chains. */ 405 sk->sk_prot->hash(sk); 406 } 407 408 if (sk->sk_prot->init) { 409 err = sk->sk_prot->init(sk); 410 if (err) 411 sk_common_release(sk); 412 } 413out: 414 return err; 415out_rcu_unlock: 416 rcu_read_unlock(); 417 goto out; 418} 419 420 421/* 422 * The peer socket should always be NULL (or else). When we call this 423 * function we are destroying the object and from then on nobody 424 * should refer to it. 425 */ 426int inet_release(struct socket *sock) 427{ 428 struct sock *sk = sock->sk; 429 430 if (sk) { 431 long timeout; 432 433 sock_rps_reset_flow(sk); 434 435 /* Applications forget to leave groups before exiting */ 436 ip_mc_drop_socket(sk); 437 438 /* If linger is set, we don't return until the close 439 * is complete. Otherwise we return immediately. The 440 * actually closing is done the same either way. 441 * 442 * If the close is due to the process exiting, we never 443 * linger.. 444 */ 445 timeout = 0; 446 if (sock_flag(sk, SOCK_LINGER) && 447 !(current->flags & PF_EXITING)) 448 timeout = sk->sk_lingertime; 449 sock->sk = NULL; 450 sk->sk_prot->close(sk, timeout); 451 } 452 return 0; 453} 454EXPORT_SYMBOL(inet_release); 455 456/* It is off by default, see below. */ 457int sysctl_ip_nonlocal_bind __read_mostly; 458EXPORT_SYMBOL(sysctl_ip_nonlocal_bind); 459 460int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 461{ 462 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 463 struct sock *sk = sock->sk; 464 struct inet_sock *inet = inet_sk(sk); 465 struct net *net = sock_net(sk); 466 unsigned short snum; 467 int chk_addr_ret; 468 int err; 469 470 /* If the socket has its own bind function then use it. (RAW) */ 471 if (sk->sk_prot->bind) { 472 err = sk->sk_prot->bind(sk, uaddr, addr_len); 473 goto out; 474 } 475 err = -EINVAL; 476 if (addr_len < sizeof(struct sockaddr_in)) 477 goto out; 478 479 if (addr->sin_family != AF_INET) { 480 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET) 481 * only if s_addr is INADDR_ANY. 482 */ 483 err = -EAFNOSUPPORT; 484 if (addr->sin_family != AF_UNSPEC || 485 addr->sin_addr.s_addr != htonl(INADDR_ANY)) 486 goto out; 487 } 488 489 chk_addr_ret = inet_addr_type(net, addr->sin_addr.s_addr); 490 491 /* Not specified by any standard per-se, however it breaks too 492 * many applications when removed. It is unfortunate since 493 * allowing applications to make a non-local bind solves 494 * several problems with systems using dynamic addressing. 495 * (ie. your servers still start up even if your ISDN link 496 * is temporarily down) 497 */ 498 err = -EADDRNOTAVAIL; 499 if (!sysctl_ip_nonlocal_bind && 500 !(inet->freebind || inet->transparent) && 501 addr->sin_addr.s_addr != htonl(INADDR_ANY) && 502 chk_addr_ret != RTN_LOCAL && 503 chk_addr_ret != RTN_MULTICAST && 504 chk_addr_ret != RTN_BROADCAST) 505 goto out; 506 507 snum = ntohs(addr->sin_port); 508 err = -EACCES; 509 if (snum && snum < PROT_SOCK && 510 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 511 goto out; 512 513 /* We keep a pair of addresses. rcv_saddr is the one 514 * used by hash lookups, and saddr is used for transmit. 515 * 516 * In the BSD API these are the same except where it 517 * would be illegal to use them (multicast/broadcast) in 518 * which case the sending device address is used. 519 */ 520 lock_sock(sk); 521 522 /* Check these errors (active socket, double bind). */ 523 err = -EINVAL; 524 if (sk->sk_state != TCP_CLOSE || inet->inet_num) 525 goto out_release_sock; 526 527 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 528 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 529 inet->inet_saddr = 0; /* Use device */ 530 531 /* Make sure we are allowed to bind here. */ 532 if (sk->sk_prot->get_port(sk, snum)) { 533 inet->inet_saddr = inet->inet_rcv_saddr = 0; 534 err = -EADDRINUSE; 535 goto out_release_sock; 536 } 537 538 if (inet->inet_rcv_saddr) 539 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 540 if (snum) 541 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 542 inet->inet_sport = htons(inet->inet_num); 543 inet->inet_daddr = 0; 544 inet->inet_dport = 0; 545 sk_dst_reset(sk); 546 err = 0; 547out_release_sock: 548 release_sock(sk); 549out: 550 return err; 551} 552EXPORT_SYMBOL(inet_bind); 553 554int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr, 555 int addr_len, int flags) 556{ 557 struct sock *sk = sock->sk; 558 559 if (addr_len < sizeof(uaddr->sa_family)) 560 return -EINVAL; 561 if (uaddr->sa_family == AF_UNSPEC) 562 return sk->sk_prot->disconnect(sk, flags); 563 564 if (!inet_sk(sk)->inet_num && inet_autobind(sk)) 565 return -EAGAIN; 566 return sk->sk_prot->connect(sk, uaddr, addr_len); 567} 568EXPORT_SYMBOL(inet_dgram_connect); 569 570static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias) 571{ 572 DEFINE_WAIT(wait); 573 574 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 575 sk->sk_write_pending += writebias; 576 577 /* Basic assumption: if someone sets sk->sk_err, he _must_ 578 * change state of the socket from TCP_SYN_*. 579 * Connect() does not allow to get error notifications 580 * without closing the socket. 581 */ 582 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 583 release_sock(sk); 584 timeo = schedule_timeout(timeo); 585 lock_sock(sk); 586 if (signal_pending(current) || !timeo) 587 break; 588 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 589 } 590 finish_wait(sk_sleep(sk), &wait); 591 sk->sk_write_pending -= writebias; 592 return timeo; 593} 594 595/* 596 * Connect to a remote host. There is regrettably still a little 597 * TCP 'magic' in here. 598 */ 599int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 600 int addr_len, int flags) 601{ 602 struct sock *sk = sock->sk; 603 int err; 604 long timeo; 605 606 if (addr_len < sizeof(uaddr->sa_family)) 607 return -EINVAL; 608 609 if (uaddr->sa_family == AF_UNSPEC) { 610 err = sk->sk_prot->disconnect(sk, flags); 611 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 612 goto out; 613 } 614 615 switch (sock->state) { 616 default: 617 err = -EINVAL; 618 goto out; 619 case SS_CONNECTED: 620 err = -EISCONN; 621 goto out; 622 case SS_CONNECTING: 623 err = -EALREADY; 624 /* Fall out of switch with err, set for this state */ 625 break; 626 case SS_UNCONNECTED: 627 err = -EISCONN; 628 if (sk->sk_state != TCP_CLOSE) 629 goto out; 630 631 err = sk->sk_prot->connect(sk, uaddr, addr_len); 632 if (err < 0) 633 goto out; 634 635 sock->state = SS_CONNECTING; 636 637 /* Just entered SS_CONNECTING state; the only 638 * difference is that return value in non-blocking 639 * case is EINPROGRESS, rather than EALREADY. 640 */ 641 err = -EINPROGRESS; 642 break; 643 } 644 645 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 646 647 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 648 int writebias = (sk->sk_protocol == IPPROTO_TCP) && 649 tcp_sk(sk)->fastopen_req && 650 tcp_sk(sk)->fastopen_req->data ? 1 : 0; 651 652 /* Error code is set above */ 653 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias)) 654 goto out; 655 656 err = sock_intr_errno(timeo); 657 if (signal_pending(current)) 658 goto out; 659 } 660 661 /* Connection was closed by RST, timeout, ICMP error 662 * or another process disconnected us. 663 */ 664 if (sk->sk_state == TCP_CLOSE) 665 goto sock_error; 666 667 /* sk->sk_err may be not zero now, if RECVERR was ordered by user 668 * and error was received after socket entered established state. 669 * Hence, it is handled normally after connect() return successfully. 670 */ 671 672 sock->state = SS_CONNECTED; 673 err = 0; 674out: 675 return err; 676 677sock_error: 678 err = sock_error(sk) ? : -ECONNABORTED; 679 sock->state = SS_UNCONNECTED; 680 if (sk->sk_prot->disconnect(sk, flags)) 681 sock->state = SS_DISCONNECTING; 682 goto out; 683} 684EXPORT_SYMBOL(__inet_stream_connect); 685 686int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 687 int addr_len, int flags) 688{ 689 int err; 690 691 lock_sock(sock->sk); 692 err = __inet_stream_connect(sock, uaddr, addr_len, flags); 693 release_sock(sock->sk); 694 return err; 695} 696EXPORT_SYMBOL(inet_stream_connect); 697 698/* 699 * Accept a pending connection. The TCP layer now gives BSD semantics. 700 */ 701 702int inet_accept(struct socket *sock, struct socket *newsock, int flags) 703{ 704 struct sock *sk1 = sock->sk; 705 int err = -EINVAL; 706 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err); 707 708 if (!sk2) 709 goto do_err; 710 711 lock_sock(sk2); 712 713 sock_rps_record_flow(sk2); 714 WARN_ON(!((1 << sk2->sk_state) & 715 (TCPF_ESTABLISHED | TCPF_SYN_RECV | 716 TCPF_CLOSE_WAIT | TCPF_CLOSE))); 717 718 sock_graft(sk2, newsock); 719 720 newsock->state = SS_CONNECTED; 721 err = 0; 722 release_sock(sk2); 723do_err: 724 return err; 725} 726EXPORT_SYMBOL(inet_accept); 727 728 729/* 730 * This does both peername and sockname. 731 */ 732int inet_getname(struct socket *sock, struct sockaddr *uaddr, 733 int *uaddr_len, int peer) 734{ 735 struct sock *sk = sock->sk; 736 struct inet_sock *inet = inet_sk(sk); 737 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr); 738 739 sin->sin_family = AF_INET; 740 if (peer) { 741 if (!inet->inet_dport || 742 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 743 peer == 1)) 744 return -ENOTCONN; 745 sin->sin_port = inet->inet_dport; 746 sin->sin_addr.s_addr = inet->inet_daddr; 747 } else { 748 __be32 addr = inet->inet_rcv_saddr; 749 if (!addr) 750 addr = inet->inet_saddr; 751 sin->sin_port = inet->inet_sport; 752 sin->sin_addr.s_addr = addr; 753 } 754 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 755 *uaddr_len = sizeof(*sin); 756 return 0; 757} 758EXPORT_SYMBOL(inet_getname); 759 760int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 761 size_t size) 762{ 763 struct sock *sk = sock->sk; 764 765 sock_rps_record_flow(sk); 766 767 /* We may need to bind the socket. */ 768 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 769 inet_autobind(sk)) 770 return -EAGAIN; 771 772 return sk->sk_prot->sendmsg(iocb, sk, msg, size); 773} 774EXPORT_SYMBOL(inet_sendmsg); 775 776ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, 777 size_t size, int flags) 778{ 779 struct sock *sk = sock->sk; 780 781 sock_rps_record_flow(sk); 782 783 /* We may need to bind the socket. */ 784 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 785 inet_autobind(sk)) 786 return -EAGAIN; 787 788 if (sk->sk_prot->sendpage) 789 return sk->sk_prot->sendpage(sk, page, offset, size, flags); 790 return sock_no_sendpage(sock, page, offset, size, flags); 791} 792EXPORT_SYMBOL(inet_sendpage); 793 794int inet_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 795 size_t size, int flags) 796{ 797 struct sock *sk = sock->sk; 798 int addr_len = 0; 799 int err; 800 801 sock_rps_record_flow(sk); 802 803 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, 804 flags & ~MSG_DONTWAIT, &addr_len); 805 if (err >= 0) 806 msg->msg_namelen = addr_len; 807 return err; 808} 809EXPORT_SYMBOL(inet_recvmsg); 810 811int inet_shutdown(struct socket *sock, int how) 812{ 813 struct sock *sk = sock->sk; 814 int err = 0; 815 816 /* This should really check to make sure 817 * the socket is a TCP socket. (WHY AC...) 818 */ 819 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and 820 1->2 bit 2 snds. 821 2->3 */ 822 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ 823 return -EINVAL; 824 825 lock_sock(sk); 826 if (sock->state == SS_CONNECTING) { 827 if ((1 << sk->sk_state) & 828 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) 829 sock->state = SS_DISCONNECTING; 830 else 831 sock->state = SS_CONNECTED; 832 } 833 834 switch (sk->sk_state) { 835 case TCP_CLOSE: 836 err = -ENOTCONN; 837 /* Hack to wake up other listeners, who can poll for 838 POLLHUP, even on eg. unconnected UDP sockets -- RR */ 839 default: 840 sk->sk_shutdown |= how; 841 if (sk->sk_prot->shutdown) 842 sk->sk_prot->shutdown(sk, how); 843 break; 844 845 /* Remaining two branches are temporary solution for missing 846 * close() in multithreaded environment. It is _not_ a good idea, 847 * but we have no choice until close() is repaired at VFS level. 848 */ 849 case TCP_LISTEN: 850 if (!(how & RCV_SHUTDOWN)) 851 break; 852 /* Fall through */ 853 case TCP_SYN_SENT: 854 err = sk->sk_prot->disconnect(sk, O_NONBLOCK); 855 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 856 break; 857 } 858 859 /* Wake up anyone sleeping in poll. */ 860 sk->sk_state_change(sk); 861 release_sock(sk); 862 return err; 863} 864EXPORT_SYMBOL(inet_shutdown); 865 866/* 867 * ioctl() calls you can issue on an INET socket. Most of these are 868 * device configuration and stuff and very rarely used. Some ioctls 869 * pass on to the socket itself. 870 * 871 * NOTE: I like the idea of a module for the config stuff. ie ifconfig 872 * loads the devconfigure module does its configuring and unloads it. 873 * There's a good 20K of config code hanging around the kernel. 874 */ 875 876int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 877{ 878 struct sock *sk = sock->sk; 879 int err = 0; 880 struct net *net = sock_net(sk); 881 882 switch (cmd) { 883 case SIOCGSTAMP: 884 err = sock_get_timestamp(sk, (struct timeval __user *)arg); 885 break; 886 case SIOCGSTAMPNS: 887 err = sock_get_timestampns(sk, (struct timespec __user *)arg); 888 break; 889 case SIOCADDRT: 890 case SIOCDELRT: 891 case SIOCRTMSG: 892 err = ip_rt_ioctl(net, cmd, (void __user *)arg); 893 break; 894 case SIOCDARP: 895 case SIOCGARP: 896 case SIOCSARP: 897 err = arp_ioctl(net, cmd, (void __user *)arg); 898 break; 899 case SIOCGIFADDR: 900 case SIOCSIFADDR: 901 case SIOCGIFBRDADDR: 902 case SIOCSIFBRDADDR: 903 case SIOCGIFNETMASK: 904 case SIOCSIFNETMASK: 905 case SIOCGIFDSTADDR: 906 case SIOCSIFDSTADDR: 907 case SIOCSIFPFLAGS: 908 case SIOCGIFPFLAGS: 909 case SIOCSIFFLAGS: 910 err = devinet_ioctl(net, cmd, (void __user *)arg); 911 break; 912 default: 913 if (sk->sk_prot->ioctl) 914 err = sk->sk_prot->ioctl(sk, cmd, arg); 915 else 916 err = -ENOIOCTLCMD; 917 break; 918 } 919 return err; 920} 921EXPORT_SYMBOL(inet_ioctl); 922 923#ifdef CONFIG_COMPAT 924static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 925{ 926 struct sock *sk = sock->sk; 927 int err = -ENOIOCTLCMD; 928 929 if (sk->sk_prot->compat_ioctl) 930 err = sk->sk_prot->compat_ioctl(sk, cmd, arg); 931 932 return err; 933} 934#endif 935 936const struct proto_ops inet_stream_ops = { 937 .family = PF_INET, 938 .owner = THIS_MODULE, 939 .release = inet_release, 940 .bind = inet_bind, 941 .connect = inet_stream_connect, 942 .socketpair = sock_no_socketpair, 943 .accept = inet_accept, 944 .getname = inet_getname, 945 .poll = tcp_poll, 946 .ioctl = inet_ioctl, 947 .listen = inet_listen, 948 .shutdown = inet_shutdown, 949 .setsockopt = sock_common_setsockopt, 950 .getsockopt = sock_common_getsockopt, 951 .sendmsg = inet_sendmsg, 952 .recvmsg = inet_recvmsg, 953 .mmap = sock_no_mmap, 954 .sendpage = inet_sendpage, 955 .splice_read = tcp_splice_read, 956#ifdef CONFIG_COMPAT 957 .compat_setsockopt = compat_sock_common_setsockopt, 958 .compat_getsockopt = compat_sock_common_getsockopt, 959 .compat_ioctl = inet_compat_ioctl, 960#endif 961}; 962EXPORT_SYMBOL(inet_stream_ops); 963 964const struct proto_ops inet_dgram_ops = { 965 .family = PF_INET, 966 .owner = THIS_MODULE, 967 .release = inet_release, 968 .bind = inet_bind, 969 .connect = inet_dgram_connect, 970 .socketpair = sock_no_socketpair, 971 .accept = sock_no_accept, 972 .getname = inet_getname, 973 .poll = udp_poll, 974 .ioctl = inet_ioctl, 975 .listen = sock_no_listen, 976 .shutdown = inet_shutdown, 977 .setsockopt = sock_common_setsockopt, 978 .getsockopt = sock_common_getsockopt, 979 .sendmsg = inet_sendmsg, 980 .recvmsg = inet_recvmsg, 981 .mmap = sock_no_mmap, 982 .sendpage = inet_sendpage, 983#ifdef CONFIG_COMPAT 984 .compat_setsockopt = compat_sock_common_setsockopt, 985 .compat_getsockopt = compat_sock_common_getsockopt, 986 .compat_ioctl = inet_compat_ioctl, 987#endif 988}; 989EXPORT_SYMBOL(inet_dgram_ops); 990 991/* 992 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 993 * udp_poll 994 */ 995static const struct proto_ops inet_sockraw_ops = { 996 .family = PF_INET, 997 .owner = THIS_MODULE, 998 .release = inet_release, 999 .bind = inet_bind, 1000 .connect = inet_dgram_connect, 1001 .socketpair = sock_no_socketpair, 1002 .accept = sock_no_accept, 1003 .getname = inet_getname, 1004 .poll = datagram_poll, 1005 .ioctl = inet_ioctl, 1006 .listen = sock_no_listen, 1007 .shutdown = inet_shutdown, 1008 .setsockopt = sock_common_setsockopt, 1009 .getsockopt = sock_common_getsockopt, 1010 .sendmsg = inet_sendmsg, 1011 .recvmsg = inet_recvmsg, 1012 .mmap = sock_no_mmap, 1013 .sendpage = inet_sendpage, 1014#ifdef CONFIG_COMPAT 1015 .compat_setsockopt = compat_sock_common_setsockopt, 1016 .compat_getsockopt = compat_sock_common_getsockopt, 1017 .compat_ioctl = inet_compat_ioctl, 1018#endif 1019}; 1020 1021static const struct net_proto_family inet_family_ops = { 1022 .family = PF_INET, 1023 .create = inet_create, 1024 .owner = THIS_MODULE, 1025}; 1026 1027/* Upon startup we insert all the elements in inetsw_array[] into 1028 * the linked list inetsw. 1029 */ 1030static struct inet_protosw inetsw_array[] = 1031{ 1032 { 1033 .type = SOCK_STREAM, 1034 .protocol = IPPROTO_TCP, 1035 .prot = &tcp_prot, 1036 .ops = &inet_stream_ops, 1037 .no_check = 0, 1038 .flags = INET_PROTOSW_PERMANENT | 1039 INET_PROTOSW_ICSK, 1040 }, 1041 1042 { 1043 .type = SOCK_DGRAM, 1044 .protocol = IPPROTO_UDP, 1045 .prot = &udp_prot, 1046 .ops = &inet_dgram_ops, 1047 .no_check = UDP_CSUM_DEFAULT, 1048 .flags = INET_PROTOSW_PERMANENT, 1049 }, 1050 1051 { 1052 .type = SOCK_DGRAM, 1053 .protocol = IPPROTO_ICMP, 1054 .prot = &ping_prot, 1055 .ops = &inet_dgram_ops, 1056 .no_check = UDP_CSUM_DEFAULT, 1057 .flags = INET_PROTOSW_REUSE, 1058 }, 1059 1060 { 1061 .type = SOCK_RAW, 1062 .protocol = IPPROTO_IP, /* wild card */ 1063 .prot = &raw_prot, 1064 .ops = &inet_sockraw_ops, 1065 .no_check = UDP_CSUM_DEFAULT, 1066 .flags = INET_PROTOSW_REUSE, 1067 } 1068}; 1069 1070#define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) 1071 1072void inet_register_protosw(struct inet_protosw *p) 1073{ 1074 struct list_head *lh; 1075 struct inet_protosw *answer; 1076 int protocol = p->protocol; 1077 struct list_head *last_perm; 1078 1079 spin_lock_bh(&inetsw_lock); 1080 1081 if (p->type >= SOCK_MAX) 1082 goto out_illegal; 1083 1084 /* If we are trying to override a permanent protocol, bail. */ 1085 answer = NULL; 1086 last_perm = &inetsw[p->type]; 1087 list_for_each(lh, &inetsw[p->type]) { 1088 answer = list_entry(lh, struct inet_protosw, list); 1089 1090 /* Check only the non-wild match. */ 1091 if (INET_PROTOSW_PERMANENT & answer->flags) { 1092 if (protocol == answer->protocol) 1093 break; 1094 last_perm = lh; 1095 } 1096 1097 answer = NULL; 1098 } 1099 if (answer) 1100 goto out_permanent; 1101 1102 /* Add the new entry after the last permanent entry if any, so that 1103 * the new entry does not override a permanent entry when matched with 1104 * a wild-card protocol. But it is allowed to override any existing 1105 * non-permanent entry. This means that when we remove this entry, the 1106 * system automatically returns to the old behavior. 1107 */ 1108 list_add_rcu(&p->list, last_perm); 1109out: 1110 spin_unlock_bh(&inetsw_lock); 1111 1112 return; 1113 1114out_permanent: 1115 pr_err("Attempt to override permanent protocol %d\n", protocol); 1116 goto out; 1117 1118out_illegal: 1119 pr_err("Ignoring attempt to register invalid socket type %d\n", 1120 p->type); 1121 goto out; 1122} 1123EXPORT_SYMBOL(inet_register_protosw); 1124 1125void inet_unregister_protosw(struct inet_protosw *p) 1126{ 1127 if (INET_PROTOSW_PERMANENT & p->flags) { 1128 pr_err("Attempt to unregister permanent protocol %d\n", 1129 p->protocol); 1130 } else { 1131 spin_lock_bh(&inetsw_lock); 1132 list_del_rcu(&p->list); 1133 spin_unlock_bh(&inetsw_lock); 1134 1135 synchronize_net(); 1136 } 1137} 1138EXPORT_SYMBOL(inet_unregister_protosw); 1139 1140/* 1141 * Shall we try to damage output packets if routing dev changes? 1142 */ 1143 1144int sysctl_ip_dynaddr __read_mostly; 1145 1146static int inet_sk_reselect_saddr(struct sock *sk) 1147{ 1148 struct inet_sock *inet = inet_sk(sk); 1149 __be32 old_saddr = inet->inet_saddr; 1150 __be32 daddr = inet->inet_daddr; 1151 struct flowi4 *fl4; 1152 struct rtable *rt; 1153 __be32 new_saddr; 1154 struct ip_options_rcu *inet_opt; 1155 1156 inet_opt = rcu_dereference_protected(inet->inet_opt, 1157 sock_owned_by_user(sk)); 1158 if (inet_opt && inet_opt->opt.srr) 1159 daddr = inet_opt->opt.faddr; 1160 1161 /* Query new route. */ 1162 fl4 = &inet->cork.fl.u.ip4; 1163 rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk), 1164 sk->sk_bound_dev_if, sk->sk_protocol, 1165 inet->inet_sport, inet->inet_dport, sk, false); 1166 if (IS_ERR(rt)) 1167 return PTR_ERR(rt); 1168 1169 sk_setup_caps(sk, &rt->dst); 1170 1171 new_saddr = fl4->saddr; 1172 1173 if (new_saddr == old_saddr) 1174 return 0; 1175 1176 if (sysctl_ip_dynaddr > 1) { 1177 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n", 1178 __func__, &old_saddr, &new_saddr); 1179 } 1180 1181 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr; 1182 1183 /* 1184 * XXX The only one ugly spot where we need to 1185 * XXX really change the sockets identity after 1186 * XXX it has entered the hashes. -DaveM 1187 * 1188 * Besides that, it does not check for connection 1189 * uniqueness. Wait for troubles. 1190 */ 1191 __sk_prot_rehash(sk); 1192 return 0; 1193} 1194 1195int inet_sk_rebuild_header(struct sock *sk) 1196{ 1197 struct inet_sock *inet = inet_sk(sk); 1198 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); 1199 __be32 daddr; 1200 struct ip_options_rcu *inet_opt; 1201 struct flowi4 *fl4; 1202 int err; 1203 1204 /* Route is OK, nothing to do. */ 1205 if (rt) 1206 return 0; 1207 1208 /* Reroute. */ 1209 rcu_read_lock(); 1210 inet_opt = rcu_dereference(inet->inet_opt); 1211 daddr = inet->inet_daddr; 1212 if (inet_opt && inet_opt->opt.srr) 1213 daddr = inet_opt->opt.faddr; 1214 rcu_read_unlock(); 1215 fl4 = &inet->cork.fl.u.ip4; 1216 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr, 1217 inet->inet_dport, inet->inet_sport, 1218 sk->sk_protocol, RT_CONN_FLAGS(sk), 1219 sk->sk_bound_dev_if); 1220 if (!IS_ERR(rt)) { 1221 err = 0; 1222 sk_setup_caps(sk, &rt->dst); 1223 } else { 1224 err = PTR_ERR(rt); 1225 1226 /* Routing failed... */ 1227 sk->sk_route_caps = 0; 1228 /* 1229 * Other protocols have to map its equivalent state to TCP_SYN_SENT. 1230 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme 1231 */ 1232 if (!sysctl_ip_dynaddr || 1233 sk->sk_state != TCP_SYN_SENT || 1234 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 1235 (err = inet_sk_reselect_saddr(sk)) != 0) 1236 sk->sk_err_soft = -err; 1237 } 1238 1239 return err; 1240} 1241EXPORT_SYMBOL(inet_sk_rebuild_header); 1242 1243static int inet_gso_send_check(struct sk_buff *skb) 1244{ 1245 const struct net_offload *ops; 1246 const struct iphdr *iph; 1247 int proto; 1248 int ihl; 1249 int err = -EINVAL; 1250 1251 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1252 goto out; 1253 1254 iph = ip_hdr(skb); 1255 ihl = iph->ihl * 4; 1256 if (ihl < sizeof(*iph)) 1257 goto out; 1258 1259 if (unlikely(!pskb_may_pull(skb, ihl))) 1260 goto out; 1261 1262 __skb_pull(skb, ihl); 1263 skb_reset_transport_header(skb); 1264 iph = ip_hdr(skb); 1265 proto = iph->protocol; 1266 err = -EPROTONOSUPPORT; 1267 1268 rcu_read_lock(); 1269 ops = rcu_dereference(inet_offloads[proto]); 1270 if (likely(ops && ops->callbacks.gso_send_check)) 1271 err = ops->callbacks.gso_send_check(skb); 1272 rcu_read_unlock(); 1273 1274out: 1275 return err; 1276} 1277 1278static struct sk_buff *inet_gso_segment(struct sk_buff *skb, 1279 netdev_features_t features) 1280{ 1281 struct sk_buff *segs = ERR_PTR(-EINVAL); 1282 const struct net_offload *ops; 1283 struct iphdr *iph; 1284 int proto; 1285 int ihl; 1286 int id; 1287 unsigned int offset = 0; 1288 bool tunnel; 1289 1290 if (unlikely(skb_shinfo(skb)->gso_type & 1291 ~(SKB_GSO_TCPV4 | 1292 SKB_GSO_UDP | 1293 SKB_GSO_DODGY | 1294 SKB_GSO_TCP_ECN | 1295 SKB_GSO_GRE | 1296 SKB_GSO_TCPV6 | 1297 SKB_GSO_UDP_TUNNEL | 1298 SKB_GSO_MPLS | 1299 0))) 1300 goto out; 1301 1302 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1303 goto out; 1304 1305 iph = ip_hdr(skb); 1306 ihl = iph->ihl * 4; 1307 if (ihl < sizeof(*iph)) 1308 goto out; 1309 1310 if (unlikely(!pskb_may_pull(skb, ihl))) 1311 goto out; 1312 1313 tunnel = !!skb->encapsulation; 1314 1315 __skb_pull(skb, ihl); 1316 skb_reset_transport_header(skb); 1317 iph = ip_hdr(skb); 1318 id = ntohs(iph->id); 1319 proto = iph->protocol; 1320 segs = ERR_PTR(-EPROTONOSUPPORT); 1321 1322 rcu_read_lock(); 1323 ops = rcu_dereference(inet_offloads[proto]); 1324 if (likely(ops && ops->callbacks.gso_segment)) 1325 segs = ops->callbacks.gso_segment(skb, features); 1326 rcu_read_unlock(); 1327 1328 if (IS_ERR_OR_NULL(segs)) 1329 goto out; 1330 1331 skb = segs; 1332 do { 1333 iph = ip_hdr(skb); 1334 if (!tunnel && proto == IPPROTO_UDP) { 1335 iph->id = htons(id); 1336 iph->frag_off = htons(offset >> 3); 1337 if (skb->next != NULL) 1338 iph->frag_off |= htons(IP_MF); 1339 offset += (skb->len - skb->mac_len - iph->ihl * 4); 1340 } else { 1341 iph->id = htons(id++); 1342 } 1343 iph->tot_len = htons(skb->len - skb->mac_len); 1344 iph->check = 0; 1345 iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl); 1346 } while ((skb = skb->next)); 1347 1348out: 1349 return segs; 1350} 1351 1352static struct sk_buff **inet_gro_receive(struct sk_buff **head, 1353 struct sk_buff *skb) 1354{ 1355 const struct net_offload *ops; 1356 struct sk_buff **pp = NULL; 1357 struct sk_buff *p; 1358 const struct iphdr *iph; 1359 unsigned int hlen; 1360 unsigned int off; 1361 unsigned int id; 1362 int flush = 1; 1363 int proto; 1364 1365 off = skb_gro_offset(skb); 1366 hlen = off + sizeof(*iph); 1367 iph = skb_gro_header_fast(skb, off); 1368 if (skb_gro_header_hard(skb, hlen)) { 1369 iph = skb_gro_header_slow(skb, hlen, off); 1370 if (unlikely(!iph)) 1371 goto out; 1372 } 1373 1374 proto = iph->protocol; 1375 1376 rcu_read_lock(); 1377 ops = rcu_dereference(inet_offloads[proto]); 1378 if (!ops || !ops->callbacks.gro_receive) 1379 goto out_unlock; 1380 1381 if (*(u8 *)iph != 0x45) 1382 goto out_unlock; 1383 1384 if (unlikely(ip_fast_csum((u8 *)iph, 5))) 1385 goto out_unlock; 1386 1387 id = ntohl(*(__be32 *)&iph->id); 1388 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF)); 1389 id >>= 16; 1390 1391 for (p = *head; p; p = p->next) { 1392 struct iphdr *iph2; 1393 1394 if (!NAPI_GRO_CB(p)->same_flow) 1395 continue; 1396 1397 iph2 = ip_hdr(p); 1398 1399 if ((iph->protocol ^ iph2->protocol) | 1400 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) | 1401 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) { 1402 NAPI_GRO_CB(p)->same_flow = 0; 1403 continue; 1404 } 1405 1406 /* All fields must match except length and checksum. */ 1407 NAPI_GRO_CB(p)->flush |= 1408 (iph->ttl ^ iph2->ttl) | 1409 (iph->tos ^ iph2->tos) | 1410 ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF)) | 1411 ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id); 1412 1413 NAPI_GRO_CB(p)->flush |= flush; 1414 } 1415 1416 NAPI_GRO_CB(skb)->flush |= flush; 1417 skb_gro_pull(skb, sizeof(*iph)); 1418 skb_set_transport_header(skb, skb_gro_offset(skb)); 1419 1420 pp = ops->callbacks.gro_receive(head, skb); 1421 1422out_unlock: 1423 rcu_read_unlock(); 1424 1425out: 1426 NAPI_GRO_CB(skb)->flush |= flush; 1427 1428 return pp; 1429} 1430 1431static int inet_gro_complete(struct sk_buff *skb) 1432{ 1433 __be16 newlen = htons(skb->len - skb_network_offset(skb)); 1434 struct iphdr *iph = ip_hdr(skb); 1435 const struct net_offload *ops; 1436 int proto = iph->protocol; 1437 int err = -ENOSYS; 1438 1439 csum_replace2(&iph->check, iph->tot_len, newlen); 1440 iph->tot_len = newlen; 1441 1442 rcu_read_lock(); 1443 ops = rcu_dereference(inet_offloads[proto]); 1444 if (WARN_ON(!ops || !ops->callbacks.gro_complete)) 1445 goto out_unlock; 1446 1447 err = ops->callbacks.gro_complete(skb); 1448 1449out_unlock: 1450 rcu_read_unlock(); 1451 1452 return err; 1453} 1454 1455int inet_ctl_sock_create(struct sock **sk, unsigned short family, 1456 unsigned short type, unsigned char protocol, 1457 struct net *net) 1458{ 1459 struct socket *sock; 1460 int rc = sock_create_kern(family, type, protocol, &sock); 1461 1462 if (rc == 0) { 1463 *sk = sock->sk; 1464 (*sk)->sk_allocation = GFP_ATOMIC; 1465 /* 1466 * Unhash it so that IP input processing does not even see it, 1467 * we do not wish this socket to see incoming packets. 1468 */ 1469 (*sk)->sk_prot->unhash(*sk); 1470 1471 sk_change_net(*sk, net); 1472 } 1473 return rc; 1474} 1475EXPORT_SYMBOL_GPL(inet_ctl_sock_create); 1476 1477unsigned long snmp_fold_field(void __percpu *mib[], int offt) 1478{ 1479 unsigned long res = 0; 1480 int i, j; 1481 1482 for_each_possible_cpu(i) { 1483 for (j = 0; j < SNMP_ARRAY_SZ; j++) 1484 res += *(((unsigned long *) per_cpu_ptr(mib[j], i)) + offt); 1485 } 1486 return res; 1487} 1488EXPORT_SYMBOL_GPL(snmp_fold_field); 1489 1490#if BITS_PER_LONG==32 1491 1492u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t syncp_offset) 1493{ 1494 u64 res = 0; 1495 int cpu; 1496 1497 for_each_possible_cpu(cpu) { 1498 void *bhptr; 1499 struct u64_stats_sync *syncp; 1500 u64 v; 1501 unsigned int start; 1502 1503 bhptr = per_cpu_ptr(mib[0], cpu); 1504 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset); 1505 do { 1506 start = u64_stats_fetch_begin_bh(syncp); 1507 v = *(((u64 *) bhptr) + offt); 1508 } while (u64_stats_fetch_retry_bh(syncp, start)); 1509 1510 res += v; 1511 } 1512 return res; 1513} 1514EXPORT_SYMBOL_GPL(snmp_fold_field64); 1515#endif 1516 1517int snmp_mib_init(void __percpu *ptr[2], size_t mibsize, size_t align) 1518{ 1519 BUG_ON(ptr == NULL); 1520 ptr[0] = __alloc_percpu(mibsize, align); 1521 if (!ptr[0]) 1522 return -ENOMEM; 1523#if SNMP_ARRAY_SZ == 2 1524 ptr[1] = __alloc_percpu(mibsize, align); 1525 if (!ptr[1]) { 1526 free_percpu(ptr[0]); 1527 ptr[0] = NULL; 1528 return -ENOMEM; 1529 } 1530#endif 1531 return 0; 1532} 1533EXPORT_SYMBOL_GPL(snmp_mib_init); 1534 1535void snmp_mib_free(void __percpu *ptr[SNMP_ARRAY_SZ]) 1536{ 1537 int i; 1538 1539 BUG_ON(ptr == NULL); 1540 for (i = 0; i < SNMP_ARRAY_SZ; i++) { 1541 free_percpu(ptr[i]); 1542 ptr[i] = NULL; 1543 } 1544} 1545EXPORT_SYMBOL_GPL(snmp_mib_free); 1546 1547#ifdef CONFIG_IP_MULTICAST 1548static const struct net_protocol igmp_protocol = { 1549 .handler = igmp_rcv, 1550 .netns_ok = 1, 1551}; 1552#endif 1553 1554static const struct net_protocol tcp_protocol = { 1555 .early_demux = tcp_v4_early_demux, 1556 .handler = tcp_v4_rcv, 1557 .err_handler = tcp_v4_err, 1558 .no_policy = 1, 1559 .netns_ok = 1, 1560}; 1561 1562static const struct net_protocol udp_protocol = { 1563 .handler = udp_rcv, 1564 .err_handler = udp_err, 1565 .no_policy = 1, 1566 .netns_ok = 1, 1567}; 1568 1569static const struct net_protocol icmp_protocol = { 1570 .handler = icmp_rcv, 1571 .err_handler = icmp_err, 1572 .no_policy = 1, 1573 .netns_ok = 1, 1574}; 1575 1576static __net_init int ipv4_mib_init_net(struct net *net) 1577{ 1578 if (snmp_mib_init((void __percpu **)net->mib.tcp_statistics, 1579 sizeof(struct tcp_mib), 1580 __alignof__(struct tcp_mib)) < 0) 1581 goto err_tcp_mib; 1582 if (snmp_mib_init((void __percpu **)net->mib.ip_statistics, 1583 sizeof(struct ipstats_mib), 1584 __alignof__(struct ipstats_mib)) < 0) 1585 goto err_ip_mib; 1586 if (snmp_mib_init((void __percpu **)net->mib.net_statistics, 1587 sizeof(struct linux_mib), 1588 __alignof__(struct linux_mib)) < 0) 1589 goto err_net_mib; 1590 if (snmp_mib_init((void __percpu **)net->mib.udp_statistics, 1591 sizeof(struct udp_mib), 1592 __alignof__(struct udp_mib)) < 0) 1593 goto err_udp_mib; 1594 if (snmp_mib_init((void __percpu **)net->mib.udplite_statistics, 1595 sizeof(struct udp_mib), 1596 __alignof__(struct udp_mib)) < 0) 1597 goto err_udplite_mib; 1598 if (snmp_mib_init((void __percpu **)net->mib.icmp_statistics, 1599 sizeof(struct icmp_mib), 1600 __alignof__(struct icmp_mib)) < 0) 1601 goto err_icmp_mib; 1602 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib), 1603 GFP_KERNEL); 1604 if (!net->mib.icmpmsg_statistics) 1605 goto err_icmpmsg_mib; 1606 1607 tcp_mib_init(net); 1608 return 0; 1609 1610err_icmpmsg_mib: 1611 snmp_mib_free((void __percpu **)net->mib.icmp_statistics); 1612err_icmp_mib: 1613 snmp_mib_free((void __percpu **)net->mib.udplite_statistics); 1614err_udplite_mib: 1615 snmp_mib_free((void __percpu **)net->mib.udp_statistics); 1616err_udp_mib: 1617 snmp_mib_free((void __percpu **)net->mib.net_statistics); 1618err_net_mib: 1619 snmp_mib_free((void __percpu **)net->mib.ip_statistics); 1620err_ip_mib: 1621 snmp_mib_free((void __percpu **)net->mib.tcp_statistics); 1622err_tcp_mib: 1623 return -ENOMEM; 1624} 1625 1626static __net_exit void ipv4_mib_exit_net(struct net *net) 1627{ 1628 kfree(net->mib.icmpmsg_statistics); 1629 snmp_mib_free((void __percpu **)net->mib.icmp_statistics); 1630 snmp_mib_free((void __percpu **)net->mib.udplite_statistics); 1631 snmp_mib_free((void __percpu **)net->mib.udp_statistics); 1632 snmp_mib_free((void __percpu **)net->mib.net_statistics); 1633 snmp_mib_free((void __percpu **)net->mib.ip_statistics); 1634 snmp_mib_free((void __percpu **)net->mib.tcp_statistics); 1635} 1636 1637static __net_initdata struct pernet_operations ipv4_mib_ops = { 1638 .init = ipv4_mib_init_net, 1639 .exit = ipv4_mib_exit_net, 1640}; 1641 1642static int __init init_ipv4_mibs(void) 1643{ 1644 return register_pernet_subsys(&ipv4_mib_ops); 1645} 1646 1647static int ipv4_proc_init(void); 1648 1649/* 1650 * IP protocol layer initialiser 1651 */ 1652 1653static struct packet_offload ip_packet_offload __read_mostly = { 1654 .type = cpu_to_be16(ETH_P_IP), 1655 .callbacks = { 1656 .gso_send_check = inet_gso_send_check, 1657 .gso_segment = inet_gso_segment, 1658 .gro_receive = inet_gro_receive, 1659 .gro_complete = inet_gro_complete, 1660 }, 1661}; 1662 1663static int __init ipv4_offload_init(void) 1664{ 1665 /* 1666 * Add offloads 1667 */ 1668 if (udpv4_offload_init() < 0) 1669 pr_crit("%s: Cannot add UDP protocol offload\n", __func__); 1670 if (tcpv4_offload_init() < 0) 1671 pr_crit("%s: Cannot add TCP protocol offload\n", __func__); 1672 1673 dev_add_offload(&ip_packet_offload); 1674 return 0; 1675} 1676 1677fs_initcall(ipv4_offload_init); 1678 1679static struct packet_type ip_packet_type __read_mostly = { 1680 .type = cpu_to_be16(ETH_P_IP), 1681 .func = ip_rcv, 1682}; 1683 1684static int __init inet_init(void) 1685{ 1686 struct inet_protosw *q; 1687 struct list_head *r; 1688 int rc = -EINVAL; 1689 1690 BUILD_BUG_ON(sizeof(struct inet_skb_parm) > FIELD_SIZEOF(struct sk_buff, cb)); 1691 1692 sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL); 1693 if (!sysctl_local_reserved_ports) 1694 goto out; 1695 1696 rc = proto_register(&tcp_prot, 1); 1697 if (rc) 1698 goto out_free_reserved_ports; 1699 1700 rc = proto_register(&udp_prot, 1); 1701 if (rc) 1702 goto out_unregister_tcp_proto; 1703 1704 rc = proto_register(&raw_prot, 1); 1705 if (rc) 1706 goto out_unregister_udp_proto; 1707 1708 rc = proto_register(&ping_prot, 1); 1709 if (rc) 1710 goto out_unregister_raw_proto; 1711 1712 /* 1713 * Tell SOCKET that we are alive... 1714 */ 1715 1716 (void)sock_register(&inet_family_ops); 1717 1718#ifdef CONFIG_SYSCTL 1719 ip_static_sysctl_init(); 1720#endif 1721 1722 tcp_prot.sysctl_mem = init_net.ipv4.sysctl_tcp_mem; 1723 1724 /* 1725 * Add all the base protocols. 1726 */ 1727 1728 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 1729 pr_crit("%s: Cannot add ICMP protocol\n", __func__); 1730 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) 1731 pr_crit("%s: Cannot add UDP protocol\n", __func__); 1732 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) 1733 pr_crit("%s: Cannot add TCP protocol\n", __func__); 1734#ifdef CONFIG_IP_MULTICAST 1735 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 1736 pr_crit("%s: Cannot add IGMP protocol\n", __func__); 1737#endif 1738 1739 /* Register the socket-side information for inet_create. */ 1740 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 1741 INIT_LIST_HEAD(r); 1742 1743 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 1744 inet_register_protosw(q); 1745 1746 /* 1747 * Set the ARP module up 1748 */ 1749 1750 arp_init(); 1751 1752 /* 1753 * Set the IP module up 1754 */ 1755 1756 ip_init(); 1757 1758 tcp_v4_init(); 1759 1760 /* Setup TCP slab cache for open requests. */ 1761 tcp_init(); 1762 1763 /* Setup UDP memory threshold */ 1764 udp_init(); 1765 1766 /* Add UDP-Lite (RFC 3828) */ 1767 udplite4_register(); 1768 1769 ping_init(); 1770 1771 /* 1772 * Set the ICMP layer up 1773 */ 1774 1775 if (icmp_init() < 0) 1776 panic("Failed to create the ICMP control socket.\n"); 1777 1778 /* 1779 * Initialise the multicast router 1780 */ 1781#if defined(CONFIG_IP_MROUTE) 1782 if (ip_mr_init()) 1783 pr_crit("%s: Cannot init ipv4 mroute\n", __func__); 1784#endif 1785 /* 1786 * Initialise per-cpu ipv4 mibs 1787 */ 1788 1789 if (init_ipv4_mibs()) 1790 pr_crit("%s: Cannot init ipv4 mibs\n", __func__); 1791 1792 ipv4_proc_init(); 1793 1794 ipfrag_init(); 1795 1796 dev_add_pack(&ip_packet_type); 1797 1798 rc = 0; 1799out: 1800 return rc; 1801out_unregister_raw_proto: 1802 proto_unregister(&raw_prot); 1803out_unregister_udp_proto: 1804 proto_unregister(&udp_prot); 1805out_unregister_tcp_proto: 1806 proto_unregister(&tcp_prot); 1807out_free_reserved_ports: 1808 kfree(sysctl_local_reserved_ports); 1809 goto out; 1810} 1811 1812fs_initcall(inet_init); 1813 1814/* ------------------------------------------------------------------------ */ 1815 1816#ifdef CONFIG_PROC_FS 1817static int __init ipv4_proc_init(void) 1818{ 1819 int rc = 0; 1820 1821 if (raw_proc_init()) 1822 goto out_raw; 1823 if (tcp4_proc_init()) 1824 goto out_tcp; 1825 if (udp4_proc_init()) 1826 goto out_udp; 1827 if (ping_proc_init()) 1828 goto out_ping; 1829 if (ip_misc_proc_init()) 1830 goto out_misc; 1831out: 1832 return rc; 1833out_misc: 1834 ping_proc_exit(); 1835out_ping: 1836 udp4_proc_exit(); 1837out_udp: 1838 tcp4_proc_exit(); 1839out_tcp: 1840 raw_proc_exit(); 1841out_raw: 1842 rc = -ENOMEM; 1843 goto out; 1844} 1845 1846#else /* CONFIG_PROC_FS */ 1847static int __init ipv4_proc_init(void) 1848{ 1849 return 0; 1850} 1851#endif /* CONFIG_PROC_FS */ 1852 1853MODULE_ALIAS_NETPROTO(PF_INET); 1854 1855