af_inet.c revision 1bbdceef1e535add893bf71d7b7ab102e4eb69eb
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); 247 248/* 249 * Create an inet socket. 250 */ 251 252static int inet_create(struct net *net, struct socket *sock, int protocol, 253 int kern) 254{ 255 struct sock *sk; 256 struct inet_protosw *answer; 257 struct inet_sock *inet; 258 struct proto *answer_prot; 259 unsigned char answer_flags; 260 char answer_no_check; 261 int try_loading_module = 0; 262 int err; 263 264 sock->state = SS_UNCONNECTED; 265 266 /* Look for the requested type/protocol pair. */ 267lookup_protocol: 268 err = -ESOCKTNOSUPPORT; 269 rcu_read_lock(); 270 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) { 271 272 err = 0; 273 /* Check the non-wild match. */ 274 if (protocol == answer->protocol) { 275 if (protocol != IPPROTO_IP) 276 break; 277 } else { 278 /* Check for the two wild cases. */ 279 if (IPPROTO_IP == protocol) { 280 protocol = answer->protocol; 281 break; 282 } 283 if (IPPROTO_IP == answer->protocol) 284 break; 285 } 286 err = -EPROTONOSUPPORT; 287 } 288 289 if (unlikely(err)) { 290 if (try_loading_module < 2) { 291 rcu_read_unlock(); 292 /* 293 * Be more specific, e.g. net-pf-2-proto-132-type-1 294 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) 295 */ 296 if (++try_loading_module == 1) 297 request_module("net-pf-%d-proto-%d-type-%d", 298 PF_INET, protocol, sock->type); 299 /* 300 * Fall back to generic, e.g. net-pf-2-proto-132 301 * (net-pf-PF_INET-proto-IPPROTO_SCTP) 302 */ 303 else 304 request_module("net-pf-%d-proto-%d", 305 PF_INET, protocol); 306 goto lookup_protocol; 307 } else 308 goto out_rcu_unlock; 309 } 310 311 err = -EPERM; 312 if (sock->type == SOCK_RAW && !kern && 313 !ns_capable(net->user_ns, CAP_NET_RAW)) 314 goto out_rcu_unlock; 315 316 sock->ops = answer->ops; 317 answer_prot = answer->prot; 318 answer_no_check = answer->no_check; 319 answer_flags = answer->flags; 320 rcu_read_unlock(); 321 322 WARN_ON(answer_prot->slab == NULL); 323 324 err = -ENOBUFS; 325 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot); 326 if (sk == NULL) 327 goto out; 328 329 err = 0; 330 sk->sk_no_check = answer_no_check; 331 if (INET_PROTOSW_REUSE & answer_flags) 332 sk->sk_reuse = SK_CAN_REUSE; 333 334 inet = inet_sk(sk); 335 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 336 337 inet->nodefrag = 0; 338 339 if (SOCK_RAW == sock->type) { 340 inet->inet_num = protocol; 341 if (IPPROTO_RAW == protocol) 342 inet->hdrincl = 1; 343 } 344 345 if (ipv4_config.no_pmtu_disc) 346 inet->pmtudisc = IP_PMTUDISC_DONT; 347 else 348 inet->pmtudisc = IP_PMTUDISC_WANT; 349 350 inet->inet_id = 0; 351 352 sock_init_data(sock, sk); 353 354 sk->sk_destruct = inet_sock_destruct; 355 sk->sk_protocol = protocol; 356 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 357 358 inet->uc_ttl = -1; 359 inet->mc_loop = 1; 360 inet->mc_ttl = 1; 361 inet->mc_all = 1; 362 inet->mc_index = 0; 363 inet->mc_list = NULL; 364 inet->rcv_tos = 0; 365 366 sk_refcnt_debug_inc(sk); 367 368 if (inet->inet_num) { 369 /* It assumes that any protocol which allows 370 * the user to assign a number at socket 371 * creation time automatically 372 * shares. 373 */ 374 inet->inet_sport = htons(inet->inet_num); 375 /* Add to protocol hash chains. */ 376 sk->sk_prot->hash(sk); 377 } 378 379 if (sk->sk_prot->init) { 380 err = sk->sk_prot->init(sk); 381 if (err) 382 sk_common_release(sk); 383 } 384out: 385 return err; 386out_rcu_unlock: 387 rcu_read_unlock(); 388 goto out; 389} 390 391 392/* 393 * The peer socket should always be NULL (or else). When we call this 394 * function we are destroying the object and from then on nobody 395 * should refer to it. 396 */ 397int inet_release(struct socket *sock) 398{ 399 struct sock *sk = sock->sk; 400 401 if (sk) { 402 long timeout; 403 404 sock_rps_reset_flow(sk); 405 406 /* Applications forget to leave groups before exiting */ 407 ip_mc_drop_socket(sk); 408 409 /* If linger is set, we don't return until the close 410 * is complete. Otherwise we return immediately. The 411 * actually closing is done the same either way. 412 * 413 * If the close is due to the process exiting, we never 414 * linger.. 415 */ 416 timeout = 0; 417 if (sock_flag(sk, SOCK_LINGER) && 418 !(current->flags & PF_EXITING)) 419 timeout = sk->sk_lingertime; 420 sock->sk = NULL; 421 sk->sk_prot->close(sk, timeout); 422 } 423 return 0; 424} 425EXPORT_SYMBOL(inet_release); 426 427/* It is off by default, see below. */ 428int sysctl_ip_nonlocal_bind __read_mostly; 429EXPORT_SYMBOL(sysctl_ip_nonlocal_bind); 430 431int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 432{ 433 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 434 struct sock *sk = sock->sk; 435 struct inet_sock *inet = inet_sk(sk); 436 struct net *net = sock_net(sk); 437 unsigned short snum; 438 int chk_addr_ret; 439 int err; 440 441 /* If the socket has its own bind function then use it. (RAW) */ 442 if (sk->sk_prot->bind) { 443 err = sk->sk_prot->bind(sk, uaddr, addr_len); 444 goto out; 445 } 446 err = -EINVAL; 447 if (addr_len < sizeof(struct sockaddr_in)) 448 goto out; 449 450 if (addr->sin_family != AF_INET) { 451 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET) 452 * only if s_addr is INADDR_ANY. 453 */ 454 err = -EAFNOSUPPORT; 455 if (addr->sin_family != AF_UNSPEC || 456 addr->sin_addr.s_addr != htonl(INADDR_ANY)) 457 goto out; 458 } 459 460 chk_addr_ret = inet_addr_type(net, addr->sin_addr.s_addr); 461 462 /* Not specified by any standard per-se, however it breaks too 463 * many applications when removed. It is unfortunate since 464 * allowing applications to make a non-local bind solves 465 * several problems with systems using dynamic addressing. 466 * (ie. your servers still start up even if your ISDN link 467 * is temporarily down) 468 */ 469 err = -EADDRNOTAVAIL; 470 if (!sysctl_ip_nonlocal_bind && 471 !(inet->freebind || inet->transparent) && 472 addr->sin_addr.s_addr != htonl(INADDR_ANY) && 473 chk_addr_ret != RTN_LOCAL && 474 chk_addr_ret != RTN_MULTICAST && 475 chk_addr_ret != RTN_BROADCAST) 476 goto out; 477 478 snum = ntohs(addr->sin_port); 479 err = -EACCES; 480 if (snum && snum < PROT_SOCK && 481 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 482 goto out; 483 484 /* We keep a pair of addresses. rcv_saddr is the one 485 * used by hash lookups, and saddr is used for transmit. 486 * 487 * In the BSD API these are the same except where it 488 * would be illegal to use them (multicast/broadcast) in 489 * which case the sending device address is used. 490 */ 491 lock_sock(sk); 492 493 /* Check these errors (active socket, double bind). */ 494 err = -EINVAL; 495 if (sk->sk_state != TCP_CLOSE || inet->inet_num) 496 goto out_release_sock; 497 498 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 499 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 500 inet->inet_saddr = 0; /* Use device */ 501 502 /* Make sure we are allowed to bind here. */ 503 if (sk->sk_prot->get_port(sk, snum)) { 504 inet->inet_saddr = inet->inet_rcv_saddr = 0; 505 err = -EADDRINUSE; 506 goto out_release_sock; 507 } 508 509 if (inet->inet_rcv_saddr) 510 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 511 if (snum) 512 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 513 inet->inet_sport = htons(inet->inet_num); 514 inet->inet_daddr = 0; 515 inet->inet_dport = 0; 516 sk_dst_reset(sk); 517 err = 0; 518out_release_sock: 519 release_sock(sk); 520out: 521 return err; 522} 523EXPORT_SYMBOL(inet_bind); 524 525int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr, 526 int addr_len, int flags) 527{ 528 struct sock *sk = sock->sk; 529 530 if (addr_len < sizeof(uaddr->sa_family)) 531 return -EINVAL; 532 if (uaddr->sa_family == AF_UNSPEC) 533 return sk->sk_prot->disconnect(sk, flags); 534 535 if (!inet_sk(sk)->inet_num && inet_autobind(sk)) 536 return -EAGAIN; 537 return sk->sk_prot->connect(sk, uaddr, addr_len); 538} 539EXPORT_SYMBOL(inet_dgram_connect); 540 541static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias) 542{ 543 DEFINE_WAIT(wait); 544 545 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 546 sk->sk_write_pending += writebias; 547 548 /* Basic assumption: if someone sets sk->sk_err, he _must_ 549 * change state of the socket from TCP_SYN_*. 550 * Connect() does not allow to get error notifications 551 * without closing the socket. 552 */ 553 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 554 release_sock(sk); 555 timeo = schedule_timeout(timeo); 556 lock_sock(sk); 557 if (signal_pending(current) || !timeo) 558 break; 559 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 560 } 561 finish_wait(sk_sleep(sk), &wait); 562 sk->sk_write_pending -= writebias; 563 return timeo; 564} 565 566/* 567 * Connect to a remote host. There is regrettably still a little 568 * TCP 'magic' in here. 569 */ 570int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 571 int addr_len, int flags) 572{ 573 struct sock *sk = sock->sk; 574 int err; 575 long timeo; 576 577 if (addr_len < sizeof(uaddr->sa_family)) 578 return -EINVAL; 579 580 if (uaddr->sa_family == AF_UNSPEC) { 581 err = sk->sk_prot->disconnect(sk, flags); 582 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 583 goto out; 584 } 585 586 switch (sock->state) { 587 default: 588 err = -EINVAL; 589 goto out; 590 case SS_CONNECTED: 591 err = -EISCONN; 592 goto out; 593 case SS_CONNECTING: 594 err = -EALREADY; 595 /* Fall out of switch with err, set for this state */ 596 break; 597 case SS_UNCONNECTED: 598 err = -EISCONN; 599 if (sk->sk_state != TCP_CLOSE) 600 goto out; 601 602 err = sk->sk_prot->connect(sk, uaddr, addr_len); 603 if (err < 0) 604 goto out; 605 606 sock->state = SS_CONNECTING; 607 608 /* Just entered SS_CONNECTING state; the only 609 * difference is that return value in non-blocking 610 * case is EINPROGRESS, rather than EALREADY. 611 */ 612 err = -EINPROGRESS; 613 break; 614 } 615 616 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 617 618 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 619 int writebias = (sk->sk_protocol == IPPROTO_TCP) && 620 tcp_sk(sk)->fastopen_req && 621 tcp_sk(sk)->fastopen_req->data ? 1 : 0; 622 623 /* Error code is set above */ 624 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias)) 625 goto out; 626 627 err = sock_intr_errno(timeo); 628 if (signal_pending(current)) 629 goto out; 630 } 631 632 /* Connection was closed by RST, timeout, ICMP error 633 * or another process disconnected us. 634 */ 635 if (sk->sk_state == TCP_CLOSE) 636 goto sock_error; 637 638 /* sk->sk_err may be not zero now, if RECVERR was ordered by user 639 * and error was received after socket entered established state. 640 * Hence, it is handled normally after connect() return successfully. 641 */ 642 643 sock->state = SS_CONNECTED; 644 err = 0; 645out: 646 return err; 647 648sock_error: 649 err = sock_error(sk) ? : -ECONNABORTED; 650 sock->state = SS_UNCONNECTED; 651 if (sk->sk_prot->disconnect(sk, flags)) 652 sock->state = SS_DISCONNECTING; 653 goto out; 654} 655EXPORT_SYMBOL(__inet_stream_connect); 656 657int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 658 int addr_len, int flags) 659{ 660 int err; 661 662 lock_sock(sock->sk); 663 err = __inet_stream_connect(sock, uaddr, addr_len, flags); 664 release_sock(sock->sk); 665 return err; 666} 667EXPORT_SYMBOL(inet_stream_connect); 668 669/* 670 * Accept a pending connection. The TCP layer now gives BSD semantics. 671 */ 672 673int inet_accept(struct socket *sock, struct socket *newsock, int flags) 674{ 675 struct sock *sk1 = sock->sk; 676 int err = -EINVAL; 677 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err); 678 679 if (!sk2) 680 goto do_err; 681 682 lock_sock(sk2); 683 684 sock_rps_record_flow(sk2); 685 WARN_ON(!((1 << sk2->sk_state) & 686 (TCPF_ESTABLISHED | TCPF_SYN_RECV | 687 TCPF_CLOSE_WAIT | TCPF_CLOSE))); 688 689 sock_graft(sk2, newsock); 690 691 newsock->state = SS_CONNECTED; 692 err = 0; 693 release_sock(sk2); 694do_err: 695 return err; 696} 697EXPORT_SYMBOL(inet_accept); 698 699 700/* 701 * This does both peername and sockname. 702 */ 703int inet_getname(struct socket *sock, struct sockaddr *uaddr, 704 int *uaddr_len, int peer) 705{ 706 struct sock *sk = sock->sk; 707 struct inet_sock *inet = inet_sk(sk); 708 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr); 709 710 sin->sin_family = AF_INET; 711 if (peer) { 712 if (!inet->inet_dport || 713 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 714 peer == 1)) 715 return -ENOTCONN; 716 sin->sin_port = inet->inet_dport; 717 sin->sin_addr.s_addr = inet->inet_daddr; 718 } else { 719 __be32 addr = inet->inet_rcv_saddr; 720 if (!addr) 721 addr = inet->inet_saddr; 722 sin->sin_port = inet->inet_sport; 723 sin->sin_addr.s_addr = addr; 724 } 725 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 726 *uaddr_len = sizeof(*sin); 727 return 0; 728} 729EXPORT_SYMBOL(inet_getname); 730 731int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 732 size_t size) 733{ 734 struct sock *sk = sock->sk; 735 736 sock_rps_record_flow(sk); 737 738 /* We may need to bind the socket. */ 739 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 740 inet_autobind(sk)) 741 return -EAGAIN; 742 743 return sk->sk_prot->sendmsg(iocb, sk, msg, size); 744} 745EXPORT_SYMBOL(inet_sendmsg); 746 747ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, 748 size_t size, int flags) 749{ 750 struct sock *sk = sock->sk; 751 752 sock_rps_record_flow(sk); 753 754 /* We may need to bind the socket. */ 755 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 756 inet_autobind(sk)) 757 return -EAGAIN; 758 759 if (sk->sk_prot->sendpage) 760 return sk->sk_prot->sendpage(sk, page, offset, size, flags); 761 return sock_no_sendpage(sock, page, offset, size, flags); 762} 763EXPORT_SYMBOL(inet_sendpage); 764 765int inet_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 766 size_t size, int flags) 767{ 768 struct sock *sk = sock->sk; 769 int addr_len = 0; 770 int err; 771 772 sock_rps_record_flow(sk); 773 774 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, 775 flags & ~MSG_DONTWAIT, &addr_len); 776 if (err >= 0) 777 msg->msg_namelen = addr_len; 778 return err; 779} 780EXPORT_SYMBOL(inet_recvmsg); 781 782int inet_shutdown(struct socket *sock, int how) 783{ 784 struct sock *sk = sock->sk; 785 int err = 0; 786 787 /* This should really check to make sure 788 * the socket is a TCP socket. (WHY AC...) 789 */ 790 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and 791 1->2 bit 2 snds. 792 2->3 */ 793 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ 794 return -EINVAL; 795 796 lock_sock(sk); 797 if (sock->state == SS_CONNECTING) { 798 if ((1 << sk->sk_state) & 799 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) 800 sock->state = SS_DISCONNECTING; 801 else 802 sock->state = SS_CONNECTED; 803 } 804 805 switch (sk->sk_state) { 806 case TCP_CLOSE: 807 err = -ENOTCONN; 808 /* Hack to wake up other listeners, who can poll for 809 POLLHUP, even on eg. unconnected UDP sockets -- RR */ 810 default: 811 sk->sk_shutdown |= how; 812 if (sk->sk_prot->shutdown) 813 sk->sk_prot->shutdown(sk, how); 814 break; 815 816 /* Remaining two branches are temporary solution for missing 817 * close() in multithreaded environment. It is _not_ a good idea, 818 * but we have no choice until close() is repaired at VFS level. 819 */ 820 case TCP_LISTEN: 821 if (!(how & RCV_SHUTDOWN)) 822 break; 823 /* Fall through */ 824 case TCP_SYN_SENT: 825 err = sk->sk_prot->disconnect(sk, O_NONBLOCK); 826 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 827 break; 828 } 829 830 /* Wake up anyone sleeping in poll. */ 831 sk->sk_state_change(sk); 832 release_sock(sk); 833 return err; 834} 835EXPORT_SYMBOL(inet_shutdown); 836 837/* 838 * ioctl() calls you can issue on an INET socket. Most of these are 839 * device configuration and stuff and very rarely used. Some ioctls 840 * pass on to the socket itself. 841 * 842 * NOTE: I like the idea of a module for the config stuff. ie ifconfig 843 * loads the devconfigure module does its configuring and unloads it. 844 * There's a good 20K of config code hanging around the kernel. 845 */ 846 847int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 848{ 849 struct sock *sk = sock->sk; 850 int err = 0; 851 struct net *net = sock_net(sk); 852 853 switch (cmd) { 854 case SIOCGSTAMP: 855 err = sock_get_timestamp(sk, (struct timeval __user *)arg); 856 break; 857 case SIOCGSTAMPNS: 858 err = sock_get_timestampns(sk, (struct timespec __user *)arg); 859 break; 860 case SIOCADDRT: 861 case SIOCDELRT: 862 case SIOCRTMSG: 863 err = ip_rt_ioctl(net, cmd, (void __user *)arg); 864 break; 865 case SIOCDARP: 866 case SIOCGARP: 867 case SIOCSARP: 868 err = arp_ioctl(net, cmd, (void __user *)arg); 869 break; 870 case SIOCGIFADDR: 871 case SIOCSIFADDR: 872 case SIOCGIFBRDADDR: 873 case SIOCSIFBRDADDR: 874 case SIOCGIFNETMASK: 875 case SIOCSIFNETMASK: 876 case SIOCGIFDSTADDR: 877 case SIOCSIFDSTADDR: 878 case SIOCSIFPFLAGS: 879 case SIOCGIFPFLAGS: 880 case SIOCSIFFLAGS: 881 err = devinet_ioctl(net, cmd, (void __user *)arg); 882 break; 883 default: 884 if (sk->sk_prot->ioctl) 885 err = sk->sk_prot->ioctl(sk, cmd, arg); 886 else 887 err = -ENOIOCTLCMD; 888 break; 889 } 890 return err; 891} 892EXPORT_SYMBOL(inet_ioctl); 893 894#ifdef CONFIG_COMPAT 895static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 896{ 897 struct sock *sk = sock->sk; 898 int err = -ENOIOCTLCMD; 899 900 if (sk->sk_prot->compat_ioctl) 901 err = sk->sk_prot->compat_ioctl(sk, cmd, arg); 902 903 return err; 904} 905#endif 906 907const struct proto_ops inet_stream_ops = { 908 .family = PF_INET, 909 .owner = THIS_MODULE, 910 .release = inet_release, 911 .bind = inet_bind, 912 .connect = inet_stream_connect, 913 .socketpair = sock_no_socketpair, 914 .accept = inet_accept, 915 .getname = inet_getname, 916 .poll = tcp_poll, 917 .ioctl = inet_ioctl, 918 .listen = inet_listen, 919 .shutdown = inet_shutdown, 920 .setsockopt = sock_common_setsockopt, 921 .getsockopt = sock_common_getsockopt, 922 .sendmsg = inet_sendmsg, 923 .recvmsg = inet_recvmsg, 924 .mmap = sock_no_mmap, 925 .sendpage = inet_sendpage, 926 .splice_read = tcp_splice_read, 927#ifdef CONFIG_COMPAT 928 .compat_setsockopt = compat_sock_common_setsockopt, 929 .compat_getsockopt = compat_sock_common_getsockopt, 930 .compat_ioctl = inet_compat_ioctl, 931#endif 932}; 933EXPORT_SYMBOL(inet_stream_ops); 934 935const struct proto_ops inet_dgram_ops = { 936 .family = PF_INET, 937 .owner = THIS_MODULE, 938 .release = inet_release, 939 .bind = inet_bind, 940 .connect = inet_dgram_connect, 941 .socketpair = sock_no_socketpair, 942 .accept = sock_no_accept, 943 .getname = inet_getname, 944 .poll = udp_poll, 945 .ioctl = inet_ioctl, 946 .listen = sock_no_listen, 947 .shutdown = inet_shutdown, 948 .setsockopt = sock_common_setsockopt, 949 .getsockopt = sock_common_getsockopt, 950 .sendmsg = inet_sendmsg, 951 .recvmsg = inet_recvmsg, 952 .mmap = sock_no_mmap, 953 .sendpage = inet_sendpage, 954#ifdef CONFIG_COMPAT 955 .compat_setsockopt = compat_sock_common_setsockopt, 956 .compat_getsockopt = compat_sock_common_getsockopt, 957 .compat_ioctl = inet_compat_ioctl, 958#endif 959}; 960EXPORT_SYMBOL(inet_dgram_ops); 961 962/* 963 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 964 * udp_poll 965 */ 966static const struct proto_ops inet_sockraw_ops = { 967 .family = PF_INET, 968 .owner = THIS_MODULE, 969 .release = inet_release, 970 .bind = inet_bind, 971 .connect = inet_dgram_connect, 972 .socketpair = sock_no_socketpair, 973 .accept = sock_no_accept, 974 .getname = inet_getname, 975 .poll = datagram_poll, 976 .ioctl = inet_ioctl, 977 .listen = sock_no_listen, 978 .shutdown = inet_shutdown, 979 .setsockopt = sock_common_setsockopt, 980 .getsockopt = sock_common_getsockopt, 981 .sendmsg = inet_sendmsg, 982 .recvmsg = inet_recvmsg, 983 .mmap = sock_no_mmap, 984 .sendpage = inet_sendpage, 985#ifdef CONFIG_COMPAT 986 .compat_setsockopt = compat_sock_common_setsockopt, 987 .compat_getsockopt = compat_sock_common_getsockopt, 988 .compat_ioctl = inet_compat_ioctl, 989#endif 990}; 991 992static const struct net_proto_family inet_family_ops = { 993 .family = PF_INET, 994 .create = inet_create, 995 .owner = THIS_MODULE, 996}; 997 998/* Upon startup we insert all the elements in inetsw_array[] into 999 * the linked list inetsw. 1000 */ 1001static struct inet_protosw inetsw_array[] = 1002{ 1003 { 1004 .type = SOCK_STREAM, 1005 .protocol = IPPROTO_TCP, 1006 .prot = &tcp_prot, 1007 .ops = &inet_stream_ops, 1008 .no_check = 0, 1009 .flags = INET_PROTOSW_PERMANENT | 1010 INET_PROTOSW_ICSK, 1011 }, 1012 1013 { 1014 .type = SOCK_DGRAM, 1015 .protocol = IPPROTO_UDP, 1016 .prot = &udp_prot, 1017 .ops = &inet_dgram_ops, 1018 .no_check = UDP_CSUM_DEFAULT, 1019 .flags = INET_PROTOSW_PERMANENT, 1020 }, 1021 1022 { 1023 .type = SOCK_DGRAM, 1024 .protocol = IPPROTO_ICMP, 1025 .prot = &ping_prot, 1026 .ops = &inet_dgram_ops, 1027 .no_check = UDP_CSUM_DEFAULT, 1028 .flags = INET_PROTOSW_REUSE, 1029 }, 1030 1031 { 1032 .type = SOCK_RAW, 1033 .protocol = IPPROTO_IP, /* wild card */ 1034 .prot = &raw_prot, 1035 .ops = &inet_sockraw_ops, 1036 .no_check = UDP_CSUM_DEFAULT, 1037 .flags = INET_PROTOSW_REUSE, 1038 } 1039}; 1040 1041#define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) 1042 1043void inet_register_protosw(struct inet_protosw *p) 1044{ 1045 struct list_head *lh; 1046 struct inet_protosw *answer; 1047 int protocol = p->protocol; 1048 struct list_head *last_perm; 1049 1050 spin_lock_bh(&inetsw_lock); 1051 1052 if (p->type >= SOCK_MAX) 1053 goto out_illegal; 1054 1055 /* If we are trying to override a permanent protocol, bail. */ 1056 answer = NULL; 1057 last_perm = &inetsw[p->type]; 1058 list_for_each(lh, &inetsw[p->type]) { 1059 answer = list_entry(lh, struct inet_protosw, list); 1060 1061 /* Check only the non-wild match. */ 1062 if (INET_PROTOSW_PERMANENT & answer->flags) { 1063 if (protocol == answer->protocol) 1064 break; 1065 last_perm = lh; 1066 } 1067 1068 answer = NULL; 1069 } 1070 if (answer) 1071 goto out_permanent; 1072 1073 /* Add the new entry after the last permanent entry if any, so that 1074 * the new entry does not override a permanent entry when matched with 1075 * a wild-card protocol. But it is allowed to override any existing 1076 * non-permanent entry. This means that when we remove this entry, the 1077 * system automatically returns to the old behavior. 1078 */ 1079 list_add_rcu(&p->list, last_perm); 1080out: 1081 spin_unlock_bh(&inetsw_lock); 1082 1083 return; 1084 1085out_permanent: 1086 pr_err("Attempt to override permanent protocol %d\n", protocol); 1087 goto out; 1088 1089out_illegal: 1090 pr_err("Ignoring attempt to register invalid socket type %d\n", 1091 p->type); 1092 goto out; 1093} 1094EXPORT_SYMBOL(inet_register_protosw); 1095 1096void inet_unregister_protosw(struct inet_protosw *p) 1097{ 1098 if (INET_PROTOSW_PERMANENT & p->flags) { 1099 pr_err("Attempt to unregister permanent protocol %d\n", 1100 p->protocol); 1101 } else { 1102 spin_lock_bh(&inetsw_lock); 1103 list_del_rcu(&p->list); 1104 spin_unlock_bh(&inetsw_lock); 1105 1106 synchronize_net(); 1107 } 1108} 1109EXPORT_SYMBOL(inet_unregister_protosw); 1110 1111/* 1112 * Shall we try to damage output packets if routing dev changes? 1113 */ 1114 1115int sysctl_ip_dynaddr __read_mostly; 1116 1117static int inet_sk_reselect_saddr(struct sock *sk) 1118{ 1119 struct inet_sock *inet = inet_sk(sk); 1120 __be32 old_saddr = inet->inet_saddr; 1121 __be32 daddr = inet->inet_daddr; 1122 struct flowi4 *fl4; 1123 struct rtable *rt; 1124 __be32 new_saddr; 1125 struct ip_options_rcu *inet_opt; 1126 1127 inet_opt = rcu_dereference_protected(inet->inet_opt, 1128 sock_owned_by_user(sk)); 1129 if (inet_opt && inet_opt->opt.srr) 1130 daddr = inet_opt->opt.faddr; 1131 1132 /* Query new route. */ 1133 fl4 = &inet->cork.fl.u.ip4; 1134 rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk), 1135 sk->sk_bound_dev_if, sk->sk_protocol, 1136 inet->inet_sport, inet->inet_dport, sk, false); 1137 if (IS_ERR(rt)) 1138 return PTR_ERR(rt); 1139 1140 sk_setup_caps(sk, &rt->dst); 1141 1142 new_saddr = fl4->saddr; 1143 1144 if (new_saddr == old_saddr) 1145 return 0; 1146 1147 if (sysctl_ip_dynaddr > 1) { 1148 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n", 1149 __func__, &old_saddr, &new_saddr); 1150 } 1151 1152 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr; 1153 1154 /* 1155 * XXX The only one ugly spot where we need to 1156 * XXX really change the sockets identity after 1157 * XXX it has entered the hashes. -DaveM 1158 * 1159 * Besides that, it does not check for connection 1160 * uniqueness. Wait for troubles. 1161 */ 1162 __sk_prot_rehash(sk); 1163 return 0; 1164} 1165 1166int inet_sk_rebuild_header(struct sock *sk) 1167{ 1168 struct inet_sock *inet = inet_sk(sk); 1169 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); 1170 __be32 daddr; 1171 struct ip_options_rcu *inet_opt; 1172 struct flowi4 *fl4; 1173 int err; 1174 1175 /* Route is OK, nothing to do. */ 1176 if (rt) 1177 return 0; 1178 1179 /* Reroute. */ 1180 rcu_read_lock(); 1181 inet_opt = rcu_dereference(inet->inet_opt); 1182 daddr = inet->inet_daddr; 1183 if (inet_opt && inet_opt->opt.srr) 1184 daddr = inet_opt->opt.faddr; 1185 rcu_read_unlock(); 1186 fl4 = &inet->cork.fl.u.ip4; 1187 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr, 1188 inet->inet_dport, inet->inet_sport, 1189 sk->sk_protocol, RT_CONN_FLAGS(sk), 1190 sk->sk_bound_dev_if); 1191 if (!IS_ERR(rt)) { 1192 err = 0; 1193 sk_setup_caps(sk, &rt->dst); 1194 } else { 1195 err = PTR_ERR(rt); 1196 1197 /* Routing failed... */ 1198 sk->sk_route_caps = 0; 1199 /* 1200 * Other protocols have to map its equivalent state to TCP_SYN_SENT. 1201 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme 1202 */ 1203 if (!sysctl_ip_dynaddr || 1204 sk->sk_state != TCP_SYN_SENT || 1205 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 1206 (err = inet_sk_reselect_saddr(sk)) != 0) 1207 sk->sk_err_soft = -err; 1208 } 1209 1210 return err; 1211} 1212EXPORT_SYMBOL(inet_sk_rebuild_header); 1213 1214static int inet_gso_send_check(struct sk_buff *skb) 1215{ 1216 const struct net_offload *ops; 1217 const struct iphdr *iph; 1218 int proto; 1219 int ihl; 1220 int err = -EINVAL; 1221 1222 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1223 goto out; 1224 1225 iph = ip_hdr(skb); 1226 ihl = iph->ihl * 4; 1227 if (ihl < sizeof(*iph)) 1228 goto out; 1229 1230 proto = iph->protocol; 1231 1232 /* Warning: after this point, iph might be no longer valid */ 1233 if (unlikely(!pskb_may_pull(skb, ihl))) 1234 goto out; 1235 __skb_pull(skb, ihl); 1236 1237 skb_reset_transport_header(skb); 1238 err = -EPROTONOSUPPORT; 1239 1240 ops = rcu_dereference(inet_offloads[proto]); 1241 if (likely(ops && ops->callbacks.gso_send_check)) 1242 err = ops->callbacks.gso_send_check(skb); 1243 1244out: 1245 return err; 1246} 1247 1248static struct sk_buff *inet_gso_segment(struct sk_buff *skb, 1249 netdev_features_t features) 1250{ 1251 struct sk_buff *segs = ERR_PTR(-EINVAL); 1252 const struct net_offload *ops; 1253 unsigned int offset = 0; 1254 struct iphdr *iph; 1255 bool tunnel; 1256 int proto; 1257 int nhoff; 1258 int ihl; 1259 int id; 1260 1261 if (unlikely(skb_shinfo(skb)->gso_type & 1262 ~(SKB_GSO_TCPV4 | 1263 SKB_GSO_UDP | 1264 SKB_GSO_DODGY | 1265 SKB_GSO_TCP_ECN | 1266 SKB_GSO_GRE | 1267 SKB_GSO_IPIP | 1268 SKB_GSO_TCPV6 | 1269 SKB_GSO_UDP_TUNNEL | 1270 SKB_GSO_MPLS | 1271 0))) 1272 goto out; 1273 1274 skb_reset_network_header(skb); 1275 nhoff = skb_network_header(skb) - skb_mac_header(skb); 1276 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1277 goto out; 1278 1279 iph = ip_hdr(skb); 1280 ihl = iph->ihl * 4; 1281 if (ihl < sizeof(*iph)) 1282 goto out; 1283 1284 id = ntohs(iph->id); 1285 proto = iph->protocol; 1286 1287 /* Warning: after this point, iph might be no longer valid */ 1288 if (unlikely(!pskb_may_pull(skb, ihl))) 1289 goto out; 1290 __skb_pull(skb, ihl); 1291 1292 tunnel = SKB_GSO_CB(skb)->encap_level > 0; 1293 if (tunnel) 1294 features = skb->dev->hw_enc_features & netif_skb_features(skb); 1295 SKB_GSO_CB(skb)->encap_level += ihl; 1296 1297 skb_reset_transport_header(skb); 1298 1299 segs = ERR_PTR(-EPROTONOSUPPORT); 1300 1301 ops = rcu_dereference(inet_offloads[proto]); 1302 if (likely(ops && ops->callbacks.gso_segment)) 1303 segs = ops->callbacks.gso_segment(skb, features); 1304 1305 if (IS_ERR_OR_NULL(segs)) 1306 goto out; 1307 1308 skb = segs; 1309 do { 1310 iph = (struct iphdr *)(skb_mac_header(skb) + nhoff); 1311 if (!tunnel && proto == IPPROTO_UDP) { 1312 iph->id = htons(id); 1313 iph->frag_off = htons(offset >> 3); 1314 if (skb->next != NULL) 1315 iph->frag_off |= htons(IP_MF); 1316 offset += skb->len - nhoff - ihl; 1317 } else { 1318 iph->id = htons(id++); 1319 } 1320 iph->tot_len = htons(skb->len - nhoff); 1321 ip_send_check(iph); 1322 if (tunnel) { 1323 skb_reset_inner_headers(skb); 1324 skb->encapsulation = 1; 1325 } 1326 skb->network_header = (u8 *)iph - skb->head; 1327 } while ((skb = skb->next)); 1328 1329out: 1330 return segs; 1331} 1332 1333static struct sk_buff **inet_gro_receive(struct sk_buff **head, 1334 struct sk_buff *skb) 1335{ 1336 const struct net_offload *ops; 1337 struct sk_buff **pp = NULL; 1338 struct sk_buff *p; 1339 const struct iphdr *iph; 1340 unsigned int hlen; 1341 unsigned int off; 1342 unsigned int id; 1343 int flush = 1; 1344 int proto; 1345 1346 off = skb_gro_offset(skb); 1347 hlen = off + sizeof(*iph); 1348 iph = skb_gro_header_fast(skb, off); 1349 if (skb_gro_header_hard(skb, hlen)) { 1350 iph = skb_gro_header_slow(skb, hlen, off); 1351 if (unlikely(!iph)) 1352 goto out; 1353 } 1354 1355 proto = iph->protocol; 1356 1357 rcu_read_lock(); 1358 ops = rcu_dereference(inet_offloads[proto]); 1359 if (!ops || !ops->callbacks.gro_receive) 1360 goto out_unlock; 1361 1362 if (*(u8 *)iph != 0x45) 1363 goto out_unlock; 1364 1365 if (unlikely(ip_fast_csum((u8 *)iph, 5))) 1366 goto out_unlock; 1367 1368 id = ntohl(*(__be32 *)&iph->id); 1369 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF)); 1370 id >>= 16; 1371 1372 for (p = *head; p; p = p->next) { 1373 struct iphdr *iph2; 1374 1375 if (!NAPI_GRO_CB(p)->same_flow) 1376 continue; 1377 1378 iph2 = ip_hdr(p); 1379 1380 if ((iph->protocol ^ iph2->protocol) | 1381 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) | 1382 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) { 1383 NAPI_GRO_CB(p)->same_flow = 0; 1384 continue; 1385 } 1386 1387 /* All fields must match except length and checksum. */ 1388 NAPI_GRO_CB(p)->flush |= 1389 (iph->ttl ^ iph2->ttl) | 1390 (iph->tos ^ iph2->tos) | 1391 (__force int)((iph->frag_off ^ iph2->frag_off) & htons(IP_DF)) | 1392 ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id); 1393 1394 NAPI_GRO_CB(p)->flush |= flush; 1395 } 1396 1397 NAPI_GRO_CB(skb)->flush |= flush; 1398 skb_gro_pull(skb, sizeof(*iph)); 1399 skb_set_transport_header(skb, skb_gro_offset(skb)); 1400 1401 pp = ops->callbacks.gro_receive(head, skb); 1402 1403out_unlock: 1404 rcu_read_unlock(); 1405 1406out: 1407 NAPI_GRO_CB(skb)->flush |= flush; 1408 1409 return pp; 1410} 1411 1412static int inet_gro_complete(struct sk_buff *skb) 1413{ 1414 __be16 newlen = htons(skb->len - skb_network_offset(skb)); 1415 struct iphdr *iph = ip_hdr(skb); 1416 const struct net_offload *ops; 1417 int proto = iph->protocol; 1418 int err = -ENOSYS; 1419 1420 csum_replace2(&iph->check, iph->tot_len, newlen); 1421 iph->tot_len = newlen; 1422 1423 rcu_read_lock(); 1424 ops = rcu_dereference(inet_offloads[proto]); 1425 if (WARN_ON(!ops || !ops->callbacks.gro_complete)) 1426 goto out_unlock; 1427 1428 err = ops->callbacks.gro_complete(skb); 1429 1430out_unlock: 1431 rcu_read_unlock(); 1432 1433 return err; 1434} 1435 1436int inet_ctl_sock_create(struct sock **sk, unsigned short family, 1437 unsigned short type, unsigned char protocol, 1438 struct net *net) 1439{ 1440 struct socket *sock; 1441 int rc = sock_create_kern(family, type, protocol, &sock); 1442 1443 if (rc == 0) { 1444 *sk = sock->sk; 1445 (*sk)->sk_allocation = GFP_ATOMIC; 1446 /* 1447 * Unhash it so that IP input processing does not even see it, 1448 * we do not wish this socket to see incoming packets. 1449 */ 1450 (*sk)->sk_prot->unhash(*sk); 1451 1452 sk_change_net(*sk, net); 1453 } 1454 return rc; 1455} 1456EXPORT_SYMBOL_GPL(inet_ctl_sock_create); 1457 1458unsigned long snmp_fold_field(void __percpu *mib[], int offt) 1459{ 1460 unsigned long res = 0; 1461 int i, j; 1462 1463 for_each_possible_cpu(i) { 1464 for (j = 0; j < SNMP_ARRAY_SZ; j++) 1465 res += *(((unsigned long *) per_cpu_ptr(mib[j], i)) + offt); 1466 } 1467 return res; 1468} 1469EXPORT_SYMBOL_GPL(snmp_fold_field); 1470 1471#if BITS_PER_LONG==32 1472 1473u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t syncp_offset) 1474{ 1475 u64 res = 0; 1476 int cpu; 1477 1478 for_each_possible_cpu(cpu) { 1479 void *bhptr; 1480 struct u64_stats_sync *syncp; 1481 u64 v; 1482 unsigned int start; 1483 1484 bhptr = per_cpu_ptr(mib[0], cpu); 1485 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset); 1486 do { 1487 start = u64_stats_fetch_begin_bh(syncp); 1488 v = *(((u64 *) bhptr) + offt); 1489 } while (u64_stats_fetch_retry_bh(syncp, start)); 1490 1491 res += v; 1492 } 1493 return res; 1494} 1495EXPORT_SYMBOL_GPL(snmp_fold_field64); 1496#endif 1497 1498int snmp_mib_init(void __percpu *ptr[2], size_t mibsize, size_t align) 1499{ 1500 BUG_ON(ptr == NULL); 1501 ptr[0] = __alloc_percpu(mibsize, align); 1502 if (!ptr[0]) 1503 return -ENOMEM; 1504#if SNMP_ARRAY_SZ == 2 1505 ptr[1] = __alloc_percpu(mibsize, align); 1506 if (!ptr[1]) { 1507 free_percpu(ptr[0]); 1508 ptr[0] = NULL; 1509 return -ENOMEM; 1510 } 1511#endif 1512 return 0; 1513} 1514EXPORT_SYMBOL_GPL(snmp_mib_init); 1515 1516#ifdef CONFIG_IP_MULTICAST 1517static const struct net_protocol igmp_protocol = { 1518 .handler = igmp_rcv, 1519 .netns_ok = 1, 1520}; 1521#endif 1522 1523static const struct net_protocol tcp_protocol = { 1524 .early_demux = tcp_v4_early_demux, 1525 .handler = tcp_v4_rcv, 1526 .err_handler = tcp_v4_err, 1527 .no_policy = 1, 1528 .netns_ok = 1, 1529}; 1530 1531static const struct net_protocol udp_protocol = { 1532 .early_demux = udp_v4_early_demux, 1533 .handler = udp_rcv, 1534 .err_handler = udp_err, 1535 .no_policy = 1, 1536 .netns_ok = 1, 1537}; 1538 1539static const struct net_protocol icmp_protocol = { 1540 .handler = icmp_rcv, 1541 .err_handler = icmp_err, 1542 .no_policy = 1, 1543 .netns_ok = 1, 1544}; 1545 1546static __net_init int ipv4_mib_init_net(struct net *net) 1547{ 1548 if (snmp_mib_init((void __percpu **)net->mib.tcp_statistics, 1549 sizeof(struct tcp_mib), 1550 __alignof__(struct tcp_mib)) < 0) 1551 goto err_tcp_mib; 1552 if (snmp_mib_init((void __percpu **)net->mib.ip_statistics, 1553 sizeof(struct ipstats_mib), 1554 __alignof__(struct ipstats_mib)) < 0) 1555 goto err_ip_mib; 1556 if (snmp_mib_init((void __percpu **)net->mib.net_statistics, 1557 sizeof(struct linux_mib), 1558 __alignof__(struct linux_mib)) < 0) 1559 goto err_net_mib; 1560 if (snmp_mib_init((void __percpu **)net->mib.udp_statistics, 1561 sizeof(struct udp_mib), 1562 __alignof__(struct udp_mib)) < 0) 1563 goto err_udp_mib; 1564 if (snmp_mib_init((void __percpu **)net->mib.udplite_statistics, 1565 sizeof(struct udp_mib), 1566 __alignof__(struct udp_mib)) < 0) 1567 goto err_udplite_mib; 1568 if (snmp_mib_init((void __percpu **)net->mib.icmp_statistics, 1569 sizeof(struct icmp_mib), 1570 __alignof__(struct icmp_mib)) < 0) 1571 goto err_icmp_mib; 1572 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib), 1573 GFP_KERNEL); 1574 if (!net->mib.icmpmsg_statistics) 1575 goto err_icmpmsg_mib; 1576 1577 tcp_mib_init(net); 1578 return 0; 1579 1580err_icmpmsg_mib: 1581 snmp_mib_free((void __percpu **)net->mib.icmp_statistics); 1582err_icmp_mib: 1583 snmp_mib_free((void __percpu **)net->mib.udplite_statistics); 1584err_udplite_mib: 1585 snmp_mib_free((void __percpu **)net->mib.udp_statistics); 1586err_udp_mib: 1587 snmp_mib_free((void __percpu **)net->mib.net_statistics); 1588err_net_mib: 1589 snmp_mib_free((void __percpu **)net->mib.ip_statistics); 1590err_ip_mib: 1591 snmp_mib_free((void __percpu **)net->mib.tcp_statistics); 1592err_tcp_mib: 1593 return -ENOMEM; 1594} 1595 1596static __net_exit void ipv4_mib_exit_net(struct net *net) 1597{ 1598 kfree(net->mib.icmpmsg_statistics); 1599 snmp_mib_free((void __percpu **)net->mib.icmp_statistics); 1600 snmp_mib_free((void __percpu **)net->mib.udplite_statistics); 1601 snmp_mib_free((void __percpu **)net->mib.udp_statistics); 1602 snmp_mib_free((void __percpu **)net->mib.net_statistics); 1603 snmp_mib_free((void __percpu **)net->mib.ip_statistics); 1604 snmp_mib_free((void __percpu **)net->mib.tcp_statistics); 1605} 1606 1607static __net_initdata struct pernet_operations ipv4_mib_ops = { 1608 .init = ipv4_mib_init_net, 1609 .exit = ipv4_mib_exit_net, 1610}; 1611 1612static int __init init_ipv4_mibs(void) 1613{ 1614 return register_pernet_subsys(&ipv4_mib_ops); 1615} 1616 1617static int ipv4_proc_init(void); 1618 1619/* 1620 * IP protocol layer initialiser 1621 */ 1622 1623static struct packet_offload ip_packet_offload __read_mostly = { 1624 .type = cpu_to_be16(ETH_P_IP), 1625 .callbacks = { 1626 .gso_send_check = inet_gso_send_check, 1627 .gso_segment = inet_gso_segment, 1628 .gro_receive = inet_gro_receive, 1629 .gro_complete = inet_gro_complete, 1630 }, 1631}; 1632 1633static const struct net_offload ipip_offload = { 1634 .callbacks = { 1635 .gso_send_check = inet_gso_send_check, 1636 .gso_segment = inet_gso_segment, 1637 }, 1638}; 1639 1640static int __init ipv4_offload_init(void) 1641{ 1642 /* 1643 * Add offloads 1644 */ 1645 if (udpv4_offload_init() < 0) 1646 pr_crit("%s: Cannot add UDP protocol offload\n", __func__); 1647 if (tcpv4_offload_init() < 0) 1648 pr_crit("%s: Cannot add TCP protocol offload\n", __func__); 1649 1650 dev_add_offload(&ip_packet_offload); 1651 inet_add_offload(&ipip_offload, IPPROTO_IPIP); 1652 return 0; 1653} 1654 1655fs_initcall(ipv4_offload_init); 1656 1657static struct packet_type ip_packet_type __read_mostly = { 1658 .type = cpu_to_be16(ETH_P_IP), 1659 .func = ip_rcv, 1660}; 1661 1662static int __init inet_init(void) 1663{ 1664 struct inet_protosw *q; 1665 struct list_head *r; 1666 int rc = -EINVAL; 1667 1668 BUILD_BUG_ON(sizeof(struct inet_skb_parm) > FIELD_SIZEOF(struct sk_buff, cb)); 1669 1670 sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL); 1671 if (!sysctl_local_reserved_ports) 1672 goto out; 1673 1674 rc = proto_register(&tcp_prot, 1); 1675 if (rc) 1676 goto out_free_reserved_ports; 1677 1678 rc = proto_register(&udp_prot, 1); 1679 if (rc) 1680 goto out_unregister_tcp_proto; 1681 1682 rc = proto_register(&raw_prot, 1); 1683 if (rc) 1684 goto out_unregister_udp_proto; 1685 1686 rc = proto_register(&ping_prot, 1); 1687 if (rc) 1688 goto out_unregister_raw_proto; 1689 1690 /* 1691 * Tell SOCKET that we are alive... 1692 */ 1693 1694 (void)sock_register(&inet_family_ops); 1695 1696#ifdef CONFIG_SYSCTL 1697 ip_static_sysctl_init(); 1698#endif 1699 1700 tcp_prot.sysctl_mem = init_net.ipv4.sysctl_tcp_mem; 1701 1702 /* 1703 * Add all the base protocols. 1704 */ 1705 1706 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 1707 pr_crit("%s: Cannot add ICMP protocol\n", __func__); 1708 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) 1709 pr_crit("%s: Cannot add UDP protocol\n", __func__); 1710 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) 1711 pr_crit("%s: Cannot add TCP protocol\n", __func__); 1712#ifdef CONFIG_IP_MULTICAST 1713 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 1714 pr_crit("%s: Cannot add IGMP protocol\n", __func__); 1715#endif 1716 1717 /* Register the socket-side information for inet_create. */ 1718 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 1719 INIT_LIST_HEAD(r); 1720 1721 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 1722 inet_register_protosw(q); 1723 1724 /* 1725 * Set the ARP module up 1726 */ 1727 1728 arp_init(); 1729 1730 /* 1731 * Set the IP module up 1732 */ 1733 1734 ip_init(); 1735 1736 tcp_v4_init(); 1737 1738 /* Setup TCP slab cache for open requests. */ 1739 tcp_init(); 1740 1741 /* Setup UDP memory threshold */ 1742 udp_init(); 1743 1744 /* Add UDP-Lite (RFC 3828) */ 1745 udplite4_register(); 1746 1747 ping_init(); 1748 1749 /* 1750 * Set the ICMP layer up 1751 */ 1752 1753 if (icmp_init() < 0) 1754 panic("Failed to create the ICMP control socket.\n"); 1755 1756 /* 1757 * Initialise the multicast router 1758 */ 1759#if defined(CONFIG_IP_MROUTE) 1760 if (ip_mr_init()) 1761 pr_crit("%s: Cannot init ipv4 mroute\n", __func__); 1762#endif 1763 /* 1764 * Initialise per-cpu ipv4 mibs 1765 */ 1766 1767 if (init_ipv4_mibs()) 1768 pr_crit("%s: Cannot init ipv4 mibs\n", __func__); 1769 1770 ipv4_proc_init(); 1771 1772 ipfrag_init(); 1773 1774 dev_add_pack(&ip_packet_type); 1775 1776 rc = 0; 1777out: 1778 return rc; 1779out_unregister_raw_proto: 1780 proto_unregister(&raw_prot); 1781out_unregister_udp_proto: 1782 proto_unregister(&udp_prot); 1783out_unregister_tcp_proto: 1784 proto_unregister(&tcp_prot); 1785out_free_reserved_ports: 1786 kfree(sysctl_local_reserved_ports); 1787 goto out; 1788} 1789 1790fs_initcall(inet_init); 1791 1792/* ------------------------------------------------------------------------ */ 1793 1794#ifdef CONFIG_PROC_FS 1795static int __init ipv4_proc_init(void) 1796{ 1797 int rc = 0; 1798 1799 if (raw_proc_init()) 1800 goto out_raw; 1801 if (tcp4_proc_init()) 1802 goto out_tcp; 1803 if (udp4_proc_init()) 1804 goto out_udp; 1805 if (ping_proc_init()) 1806 goto out_ping; 1807 if (ip_misc_proc_init()) 1808 goto out_misc; 1809out: 1810 return rc; 1811out_misc: 1812 ping_proc_exit(); 1813out_ping: 1814 udp4_proc_exit(); 1815out_udp: 1816 tcp4_proc_exit(); 1817out_tcp: 1818 raw_proc_exit(); 1819out_raw: 1820 rc = -ENOMEM; 1821 goto out; 1822} 1823 1824#else /* CONFIG_PROC_FS */ 1825static int __init ipv4_proc_init(void) 1826{ 1827 return 0; 1828} 1829#endif /* CONFIG_PROC_FS */ 1830 1831MODULE_ALIAS_NETPROTO(PF_INET); 1832 1833