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); 128 129/* New destruction routine */ 130 131void inet_sock_destruct(struct sock *sk) 132{ 133 struct inet_sock *inet = inet_sk(sk); 134 135 __skb_queue_purge(&sk->sk_receive_queue); 136 __skb_queue_purge(&sk->sk_error_queue); 137 138 sk_mem_reclaim(sk); 139 140 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) { 141 pr_err("Attempt to release TCP socket in state %d %p\n", 142 sk->sk_state, sk); 143 return; 144 } 145 if (!sock_flag(sk, SOCK_DEAD)) { 146 pr_err("Attempt to release alive inet socket %p\n", sk); 147 return; 148 } 149 150 WARN_ON(atomic_read(&sk->sk_rmem_alloc)); 151 WARN_ON(atomic_read(&sk->sk_wmem_alloc)); 152 WARN_ON(sk->sk_wmem_queued); 153 WARN_ON(sk->sk_forward_alloc); 154 155 kfree(rcu_dereference_protected(inet->inet_opt, 1)); 156 dst_release(rcu_dereference_check(sk->sk_dst_cache, 1)); 157 dst_release(sk->sk_rx_dst); 158 sk_refcnt_debug_dec(sk); 159} 160EXPORT_SYMBOL(inet_sock_destruct); 161 162/* 163 * The routines beyond this point handle the behaviour of an AF_INET 164 * socket object. Mostly it punts to the subprotocols of IP to do 165 * the work. 166 */ 167 168/* 169 * Automatically bind an unbound socket. 170 */ 171 172static int inet_autobind(struct sock *sk) 173{ 174 struct inet_sock *inet; 175 /* We may need to bind the socket. */ 176 lock_sock(sk); 177 inet = inet_sk(sk); 178 if (!inet->inet_num) { 179 if (sk->sk_prot->get_port(sk, 0)) { 180 release_sock(sk); 181 return -EAGAIN; 182 } 183 inet->inet_sport = htons(inet->inet_num); 184 } 185 release_sock(sk); 186 return 0; 187} 188 189/* 190 * Move a socket into listening state. 191 */ 192int inet_listen(struct socket *sock, int backlog) 193{ 194 struct sock *sk = sock->sk; 195 unsigned char old_state; 196 int err; 197 198 lock_sock(sk); 199 200 err = -EINVAL; 201 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM) 202 goto out; 203 204 old_state = sk->sk_state; 205 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN))) 206 goto out; 207 208 /* Really, if the socket is already in listen state 209 * we can only allow the backlog to be adjusted. 210 */ 211 if (old_state != TCP_LISTEN) { 212 /* Check special setups for testing purpose to enable TFO w/o 213 * requiring TCP_FASTOPEN sockopt. 214 * Note that only TCP sockets (SOCK_STREAM) will reach here. 215 * Also fastopenq may already been allocated because this 216 * socket was in TCP_LISTEN state previously but was 217 * shutdown() (rather than close()). 218 */ 219 if ((sysctl_tcp_fastopen & TFO_SERVER_ENABLE) != 0 && 220 !inet_csk(sk)->icsk_accept_queue.fastopenq) { 221 if ((sysctl_tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) != 0) 222 err = fastopen_init_queue(sk, backlog); 223 else if ((sysctl_tcp_fastopen & 224 TFO_SERVER_WO_SOCKOPT2) != 0) 225 err = fastopen_init_queue(sk, 226 ((uint)sysctl_tcp_fastopen) >> 16); 227 else 228 err = 0; 229 if (err) 230 goto out; 231 232 tcp_fastopen_init_key_once(true); 233 } 234 err = inet_csk_listen_start(sk, backlog); 235 if (err) 236 goto out; 237 } 238 sk->sk_max_ack_backlog = backlog; 239 err = 0; 240 241out: 242 release_sock(sk); 243 return err; 244} 245EXPORT_SYMBOL(inet_listen); 246 247/* 248 * Create an inet socket. 249 */ 250 251static int inet_create(struct net *net, struct socket *sock, int protocol, 252 int kern) 253{ 254 struct sock *sk; 255 struct inet_protosw *answer; 256 struct inet_sock *inet; 257 struct proto *answer_prot; 258 unsigned char answer_flags; 259 int try_loading_module = 0; 260 int err; 261 262 if (protocol < 0 || protocol >= IPPROTO_MAX) 263 return -EINVAL; 264 265 sock->state = SS_UNCONNECTED; 266 267 /* Look for the requested type/protocol pair. */ 268lookup_protocol: 269 err = -ESOCKTNOSUPPORT; 270 rcu_read_lock(); 271 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) { 272 273 err = 0; 274 /* Check the non-wild match. */ 275 if (protocol == answer->protocol) { 276 if (protocol != IPPROTO_IP) 277 break; 278 } else { 279 /* Check for the two wild cases. */ 280 if (IPPROTO_IP == protocol) { 281 protocol = answer->protocol; 282 break; 283 } 284 if (IPPROTO_IP == answer->protocol) 285 break; 286 } 287 err = -EPROTONOSUPPORT; 288 } 289 290 if (unlikely(err)) { 291 if (try_loading_module < 2) { 292 rcu_read_unlock(); 293 /* 294 * Be more specific, e.g. net-pf-2-proto-132-type-1 295 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) 296 */ 297 if (++try_loading_module == 1) 298 request_module("net-pf-%d-proto-%d-type-%d", 299 PF_INET, protocol, sock->type); 300 /* 301 * Fall back to generic, e.g. net-pf-2-proto-132 302 * (net-pf-PF_INET-proto-IPPROTO_SCTP) 303 */ 304 else 305 request_module("net-pf-%d-proto-%d", 306 PF_INET, protocol); 307 goto lookup_protocol; 308 } else 309 goto out_rcu_unlock; 310 } 311 312 err = -EPERM; 313 if (sock->type == SOCK_RAW && !kern && 314 !ns_capable(net->user_ns, CAP_NET_RAW)) 315 goto out_rcu_unlock; 316 317 sock->ops = answer->ops; 318 answer_prot = answer->prot; 319 answer_flags = answer->flags; 320 rcu_read_unlock(); 321 322 WARN_ON(!answer_prot->slab); 323 324 err = -ENOBUFS; 325 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot); 326 if (!sk) 327 goto out; 328 329 err = 0; 330 if (INET_PROTOSW_REUSE & answer_flags) 331 sk->sk_reuse = SK_CAN_REUSE; 332 333 inet = inet_sk(sk); 334 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 335 336 inet->nodefrag = 0; 337 338 if (SOCK_RAW == sock->type) { 339 inet->inet_num = protocol; 340 if (IPPROTO_RAW == protocol) 341 inet->hdrincl = 1; 342 } 343 344 if (net->ipv4.sysctl_ip_no_pmtu_disc) 345 inet->pmtudisc = IP_PMTUDISC_DONT; 346 else 347 inet->pmtudisc = IP_PMTUDISC_WANT; 348 349 inet->inet_id = 0; 350 351 sock_init_data(sock, sk); 352 353 sk->sk_destruct = inet_sock_destruct; 354 sk->sk_protocol = protocol; 355 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 356 357 inet->uc_ttl = -1; 358 inet->mc_loop = 1; 359 inet->mc_ttl = 1; 360 inet->mc_all = 1; 361 inet->mc_index = 0; 362 inet->mc_list = NULL; 363 inet->rcv_tos = 0; 364 365 sk_refcnt_debug_inc(sk); 366 367 if (inet->inet_num) { 368 /* It assumes that any protocol which allows 369 * the user to assign a number at socket 370 * creation time automatically 371 * shares. 372 */ 373 inet->inet_sport = htons(inet->inet_num); 374 /* Add to protocol hash chains. */ 375 sk->sk_prot->hash(sk); 376 } 377 378 if (sk->sk_prot->init) { 379 err = sk->sk_prot->init(sk); 380 if (err) 381 sk_common_release(sk); 382 } 383out: 384 return err; 385out_rcu_unlock: 386 rcu_read_unlock(); 387 goto out; 388} 389 390 391/* 392 * The peer socket should always be NULL (or else). When we call this 393 * function we are destroying the object and from then on nobody 394 * should refer to it. 395 */ 396int inet_release(struct socket *sock) 397{ 398 struct sock *sk = sock->sk; 399 400 if (sk) { 401 long timeout; 402 403 /* Applications forget to leave groups before exiting */ 404 ip_mc_drop_socket(sk); 405 406 /* If linger is set, we don't return until the close 407 * is complete. Otherwise we return immediately. The 408 * actually closing is done the same either way. 409 * 410 * If the close is due to the process exiting, we never 411 * linger.. 412 */ 413 timeout = 0; 414 if (sock_flag(sk, SOCK_LINGER) && 415 !(current->flags & PF_EXITING)) 416 timeout = sk->sk_lingertime; 417 sock->sk = NULL; 418 sk->sk_prot->close(sk, timeout); 419 } 420 return 0; 421} 422EXPORT_SYMBOL(inet_release); 423 424int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 425{ 426 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 427 struct sock *sk = sock->sk; 428 struct inet_sock *inet = inet_sk(sk); 429 struct net *net = sock_net(sk); 430 unsigned short snum; 431 int chk_addr_ret; 432 int err; 433 434 /* If the socket has its own bind function then use it. (RAW) */ 435 if (sk->sk_prot->bind) { 436 err = sk->sk_prot->bind(sk, uaddr, addr_len); 437 goto out; 438 } 439 err = -EINVAL; 440 if (addr_len < sizeof(struct sockaddr_in)) 441 goto out; 442 443 if (addr->sin_family != AF_INET) { 444 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET) 445 * only if s_addr is INADDR_ANY. 446 */ 447 err = -EAFNOSUPPORT; 448 if (addr->sin_family != AF_UNSPEC || 449 addr->sin_addr.s_addr != htonl(INADDR_ANY)) 450 goto out; 451 } 452 453 chk_addr_ret = inet_addr_type(net, addr->sin_addr.s_addr); 454 455 /* Not specified by any standard per-se, however it breaks too 456 * many applications when removed. It is unfortunate since 457 * allowing applications to make a non-local bind solves 458 * several problems with systems using dynamic addressing. 459 * (ie. your servers still start up even if your ISDN link 460 * is temporarily down) 461 */ 462 err = -EADDRNOTAVAIL; 463 if (!net->ipv4.sysctl_ip_nonlocal_bind && 464 !(inet->freebind || inet->transparent) && 465 addr->sin_addr.s_addr != htonl(INADDR_ANY) && 466 chk_addr_ret != RTN_LOCAL && 467 chk_addr_ret != RTN_MULTICAST && 468 chk_addr_ret != RTN_BROADCAST) 469 goto out; 470 471 snum = ntohs(addr->sin_port); 472 err = -EACCES; 473 if (snum && snum < PROT_SOCK && 474 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 475 goto out; 476 477 /* We keep a pair of addresses. rcv_saddr is the one 478 * used by hash lookups, and saddr is used for transmit. 479 * 480 * In the BSD API these are the same except where it 481 * would be illegal to use them (multicast/broadcast) in 482 * which case the sending device address is used. 483 */ 484 lock_sock(sk); 485 486 /* Check these errors (active socket, double bind). */ 487 err = -EINVAL; 488 if (sk->sk_state != TCP_CLOSE || inet->inet_num) 489 goto out_release_sock; 490 491 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 492 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 493 inet->inet_saddr = 0; /* Use device */ 494 495 /* Make sure we are allowed to bind here. */ 496 if (sk->sk_prot->get_port(sk, snum)) { 497 inet->inet_saddr = inet->inet_rcv_saddr = 0; 498 err = -EADDRINUSE; 499 goto out_release_sock; 500 } 501 502 if (inet->inet_rcv_saddr) 503 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 504 if (snum) 505 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 506 inet->inet_sport = htons(inet->inet_num); 507 inet->inet_daddr = 0; 508 inet->inet_dport = 0; 509 sk_dst_reset(sk); 510 err = 0; 511out_release_sock: 512 release_sock(sk); 513out: 514 return err; 515} 516EXPORT_SYMBOL(inet_bind); 517 518int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr, 519 int addr_len, int flags) 520{ 521 struct sock *sk = sock->sk; 522 523 if (addr_len < sizeof(uaddr->sa_family)) 524 return -EINVAL; 525 if (uaddr->sa_family == AF_UNSPEC) 526 return sk->sk_prot->disconnect(sk, flags); 527 528 if (!inet_sk(sk)->inet_num && inet_autobind(sk)) 529 return -EAGAIN; 530 return sk->sk_prot->connect(sk, uaddr, addr_len); 531} 532EXPORT_SYMBOL(inet_dgram_connect); 533 534static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias) 535{ 536 DEFINE_WAIT(wait); 537 538 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 539 sk->sk_write_pending += writebias; 540 541 /* Basic assumption: if someone sets sk->sk_err, he _must_ 542 * change state of the socket from TCP_SYN_*. 543 * Connect() does not allow to get error notifications 544 * without closing the socket. 545 */ 546 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 547 release_sock(sk); 548 timeo = schedule_timeout(timeo); 549 lock_sock(sk); 550 if (signal_pending(current) || !timeo) 551 break; 552 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 553 } 554 finish_wait(sk_sleep(sk), &wait); 555 sk->sk_write_pending -= writebias; 556 return timeo; 557} 558 559/* 560 * Connect to a remote host. There is regrettably still a little 561 * TCP 'magic' in here. 562 */ 563int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 564 int addr_len, int flags) 565{ 566 struct sock *sk = sock->sk; 567 int err; 568 long timeo; 569 570 if (addr_len < sizeof(uaddr->sa_family)) 571 return -EINVAL; 572 573 if (uaddr->sa_family == AF_UNSPEC) { 574 err = sk->sk_prot->disconnect(sk, flags); 575 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 576 goto out; 577 } 578 579 switch (sock->state) { 580 default: 581 err = -EINVAL; 582 goto out; 583 case SS_CONNECTED: 584 err = -EISCONN; 585 goto out; 586 case SS_CONNECTING: 587 err = -EALREADY; 588 /* Fall out of switch with err, set for this state */ 589 break; 590 case SS_UNCONNECTED: 591 err = -EISCONN; 592 if (sk->sk_state != TCP_CLOSE) 593 goto out; 594 595 err = sk->sk_prot->connect(sk, uaddr, addr_len); 596 if (err < 0) 597 goto out; 598 599 sock->state = SS_CONNECTING; 600 601 /* Just entered SS_CONNECTING state; the only 602 * difference is that return value in non-blocking 603 * case is EINPROGRESS, rather than EALREADY. 604 */ 605 err = -EINPROGRESS; 606 break; 607 } 608 609 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 610 611 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 612 int writebias = (sk->sk_protocol == IPPROTO_TCP) && 613 tcp_sk(sk)->fastopen_req && 614 tcp_sk(sk)->fastopen_req->data ? 1 : 0; 615 616 /* Error code is set above */ 617 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias)) 618 goto out; 619 620 err = sock_intr_errno(timeo); 621 if (signal_pending(current)) 622 goto out; 623 } 624 625 /* Connection was closed by RST, timeout, ICMP error 626 * or another process disconnected us. 627 */ 628 if (sk->sk_state == TCP_CLOSE) 629 goto sock_error; 630 631 /* sk->sk_err may be not zero now, if RECVERR was ordered by user 632 * and error was received after socket entered established state. 633 * Hence, it is handled normally after connect() return successfully. 634 */ 635 636 sock->state = SS_CONNECTED; 637 err = 0; 638out: 639 return err; 640 641sock_error: 642 err = sock_error(sk) ? : -ECONNABORTED; 643 sock->state = SS_UNCONNECTED; 644 if (sk->sk_prot->disconnect(sk, flags)) 645 sock->state = SS_DISCONNECTING; 646 goto out; 647} 648EXPORT_SYMBOL(__inet_stream_connect); 649 650int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 651 int addr_len, int flags) 652{ 653 int err; 654 655 lock_sock(sock->sk); 656 err = __inet_stream_connect(sock, uaddr, addr_len, flags); 657 release_sock(sock->sk); 658 return err; 659} 660EXPORT_SYMBOL(inet_stream_connect); 661 662/* 663 * Accept a pending connection. The TCP layer now gives BSD semantics. 664 */ 665 666int inet_accept(struct socket *sock, struct socket *newsock, int flags) 667{ 668 struct sock *sk1 = sock->sk; 669 int err = -EINVAL; 670 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err); 671 672 if (!sk2) 673 goto do_err; 674 675 lock_sock(sk2); 676 677 sock_rps_record_flow(sk2); 678 WARN_ON(!((1 << sk2->sk_state) & 679 (TCPF_ESTABLISHED | TCPF_SYN_RECV | 680 TCPF_CLOSE_WAIT | TCPF_CLOSE))); 681 682 sock_graft(sk2, newsock); 683 684 newsock->state = SS_CONNECTED; 685 err = 0; 686 release_sock(sk2); 687do_err: 688 return err; 689} 690EXPORT_SYMBOL(inet_accept); 691 692 693/* 694 * This does both peername and sockname. 695 */ 696int inet_getname(struct socket *sock, struct sockaddr *uaddr, 697 int *uaddr_len, int peer) 698{ 699 struct sock *sk = sock->sk; 700 struct inet_sock *inet = inet_sk(sk); 701 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr); 702 703 sin->sin_family = AF_INET; 704 if (peer) { 705 if (!inet->inet_dport || 706 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 707 peer == 1)) 708 return -ENOTCONN; 709 sin->sin_port = inet->inet_dport; 710 sin->sin_addr.s_addr = inet->inet_daddr; 711 } else { 712 __be32 addr = inet->inet_rcv_saddr; 713 if (!addr) 714 addr = inet->inet_saddr; 715 sin->sin_port = inet->inet_sport; 716 sin->sin_addr.s_addr = addr; 717 } 718 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 719 *uaddr_len = sizeof(*sin); 720 return 0; 721} 722EXPORT_SYMBOL(inet_getname); 723 724int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) 725{ 726 struct sock *sk = sock->sk; 727 728 sock_rps_record_flow(sk); 729 730 /* We may need to bind the socket. */ 731 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 732 inet_autobind(sk)) 733 return -EAGAIN; 734 735 return sk->sk_prot->sendmsg(sk, msg, size); 736} 737EXPORT_SYMBOL(inet_sendmsg); 738 739ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, 740 size_t size, int flags) 741{ 742 struct sock *sk = sock->sk; 743 744 sock_rps_record_flow(sk); 745 746 /* We may need to bind the socket. */ 747 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 748 inet_autobind(sk)) 749 return -EAGAIN; 750 751 if (sk->sk_prot->sendpage) 752 return sk->sk_prot->sendpage(sk, page, offset, size, flags); 753 return sock_no_sendpage(sock, page, offset, size, flags); 754} 755EXPORT_SYMBOL(inet_sendpage); 756 757int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 758 int flags) 759{ 760 struct sock *sk = sock->sk; 761 int addr_len = 0; 762 int err; 763 764 sock_rps_record_flow(sk); 765 766 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT, 767 flags & ~MSG_DONTWAIT, &addr_len); 768 if (err >= 0) 769 msg->msg_namelen = addr_len; 770 return err; 771} 772EXPORT_SYMBOL(inet_recvmsg); 773 774int inet_shutdown(struct socket *sock, int how) 775{ 776 struct sock *sk = sock->sk; 777 int err = 0; 778 779 /* This should really check to make sure 780 * the socket is a TCP socket. (WHY AC...) 781 */ 782 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and 783 1->2 bit 2 snds. 784 2->3 */ 785 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ 786 return -EINVAL; 787 788 lock_sock(sk); 789 if (sock->state == SS_CONNECTING) { 790 if ((1 << sk->sk_state) & 791 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) 792 sock->state = SS_DISCONNECTING; 793 else 794 sock->state = SS_CONNECTED; 795 } 796 797 switch (sk->sk_state) { 798 case TCP_CLOSE: 799 err = -ENOTCONN; 800 /* Hack to wake up other listeners, who can poll for 801 POLLHUP, even on eg. unconnected UDP sockets -- RR */ 802 default: 803 sk->sk_shutdown |= how; 804 if (sk->sk_prot->shutdown) 805 sk->sk_prot->shutdown(sk, how); 806 break; 807 808 /* Remaining two branches are temporary solution for missing 809 * close() in multithreaded environment. It is _not_ a good idea, 810 * but we have no choice until close() is repaired at VFS level. 811 */ 812 case TCP_LISTEN: 813 if (!(how & RCV_SHUTDOWN)) 814 break; 815 /* Fall through */ 816 case TCP_SYN_SENT: 817 err = sk->sk_prot->disconnect(sk, O_NONBLOCK); 818 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 819 break; 820 } 821 822 /* Wake up anyone sleeping in poll. */ 823 sk->sk_state_change(sk); 824 release_sock(sk); 825 return err; 826} 827EXPORT_SYMBOL(inet_shutdown); 828 829/* 830 * ioctl() calls you can issue on an INET socket. Most of these are 831 * device configuration and stuff and very rarely used. Some ioctls 832 * pass on to the socket itself. 833 * 834 * NOTE: I like the idea of a module for the config stuff. ie ifconfig 835 * loads the devconfigure module does its configuring and unloads it. 836 * There's a good 20K of config code hanging around the kernel. 837 */ 838 839int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 840{ 841 struct sock *sk = sock->sk; 842 int err = 0; 843 struct net *net = sock_net(sk); 844 845 switch (cmd) { 846 case SIOCGSTAMP: 847 err = sock_get_timestamp(sk, (struct timeval __user *)arg); 848 break; 849 case SIOCGSTAMPNS: 850 err = sock_get_timestampns(sk, (struct timespec __user *)arg); 851 break; 852 case SIOCADDRT: 853 case SIOCDELRT: 854 case SIOCRTMSG: 855 err = ip_rt_ioctl(net, cmd, (void __user *)arg); 856 break; 857 case SIOCDARP: 858 case SIOCGARP: 859 case SIOCSARP: 860 err = arp_ioctl(net, cmd, (void __user *)arg); 861 break; 862 case SIOCGIFADDR: 863 case SIOCSIFADDR: 864 case SIOCGIFBRDADDR: 865 case SIOCSIFBRDADDR: 866 case SIOCGIFNETMASK: 867 case SIOCSIFNETMASK: 868 case SIOCGIFDSTADDR: 869 case SIOCSIFDSTADDR: 870 case SIOCSIFPFLAGS: 871 case SIOCGIFPFLAGS: 872 case SIOCSIFFLAGS: 873 err = devinet_ioctl(net, cmd, (void __user *)arg); 874 break; 875 default: 876 if (sk->sk_prot->ioctl) 877 err = sk->sk_prot->ioctl(sk, cmd, arg); 878 else 879 err = -ENOIOCTLCMD; 880 break; 881 } 882 return err; 883} 884EXPORT_SYMBOL(inet_ioctl); 885 886#ifdef CONFIG_COMPAT 887static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 888{ 889 struct sock *sk = sock->sk; 890 int err = -ENOIOCTLCMD; 891 892 if (sk->sk_prot->compat_ioctl) 893 err = sk->sk_prot->compat_ioctl(sk, cmd, arg); 894 895 return err; 896} 897#endif 898 899const struct proto_ops inet_stream_ops = { 900 .family = PF_INET, 901 .owner = THIS_MODULE, 902 .release = inet_release, 903 .bind = inet_bind, 904 .connect = inet_stream_connect, 905 .socketpair = sock_no_socketpair, 906 .accept = inet_accept, 907 .getname = inet_getname, 908 .poll = tcp_poll, 909 .ioctl = inet_ioctl, 910 .listen = inet_listen, 911 .shutdown = inet_shutdown, 912 .setsockopt = sock_common_setsockopt, 913 .getsockopt = sock_common_getsockopt, 914 .sendmsg = inet_sendmsg, 915 .recvmsg = inet_recvmsg, 916 .mmap = sock_no_mmap, 917 .sendpage = inet_sendpage, 918 .splice_read = tcp_splice_read, 919#ifdef CONFIG_COMPAT 920 .compat_setsockopt = compat_sock_common_setsockopt, 921 .compat_getsockopt = compat_sock_common_getsockopt, 922 .compat_ioctl = inet_compat_ioctl, 923#endif 924}; 925EXPORT_SYMBOL(inet_stream_ops); 926 927const struct proto_ops inet_dgram_ops = { 928 .family = PF_INET, 929 .owner = THIS_MODULE, 930 .release = inet_release, 931 .bind = inet_bind, 932 .connect = inet_dgram_connect, 933 .socketpair = sock_no_socketpair, 934 .accept = sock_no_accept, 935 .getname = inet_getname, 936 .poll = udp_poll, 937 .ioctl = inet_ioctl, 938 .listen = sock_no_listen, 939 .shutdown = inet_shutdown, 940 .setsockopt = sock_common_setsockopt, 941 .getsockopt = sock_common_getsockopt, 942 .sendmsg = inet_sendmsg, 943 .recvmsg = inet_recvmsg, 944 .mmap = sock_no_mmap, 945 .sendpage = inet_sendpage, 946#ifdef CONFIG_COMPAT 947 .compat_setsockopt = compat_sock_common_setsockopt, 948 .compat_getsockopt = compat_sock_common_getsockopt, 949 .compat_ioctl = inet_compat_ioctl, 950#endif 951}; 952EXPORT_SYMBOL(inet_dgram_ops); 953 954/* 955 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 956 * udp_poll 957 */ 958static const struct proto_ops inet_sockraw_ops = { 959 .family = PF_INET, 960 .owner = THIS_MODULE, 961 .release = inet_release, 962 .bind = inet_bind, 963 .connect = inet_dgram_connect, 964 .socketpair = sock_no_socketpair, 965 .accept = sock_no_accept, 966 .getname = inet_getname, 967 .poll = datagram_poll, 968 .ioctl = inet_ioctl, 969 .listen = sock_no_listen, 970 .shutdown = inet_shutdown, 971 .setsockopt = sock_common_setsockopt, 972 .getsockopt = sock_common_getsockopt, 973 .sendmsg = inet_sendmsg, 974 .recvmsg = inet_recvmsg, 975 .mmap = sock_no_mmap, 976 .sendpage = inet_sendpage, 977#ifdef CONFIG_COMPAT 978 .compat_setsockopt = compat_sock_common_setsockopt, 979 .compat_getsockopt = compat_sock_common_getsockopt, 980 .compat_ioctl = inet_compat_ioctl, 981#endif 982}; 983 984static const struct net_proto_family inet_family_ops = { 985 .family = PF_INET, 986 .create = inet_create, 987 .owner = THIS_MODULE, 988}; 989 990/* Upon startup we insert all the elements in inetsw_array[] into 991 * the linked list inetsw. 992 */ 993static struct inet_protosw inetsw_array[] = 994{ 995 { 996 .type = SOCK_STREAM, 997 .protocol = IPPROTO_TCP, 998 .prot = &tcp_prot, 999 .ops = &inet_stream_ops, 1000 .flags = INET_PROTOSW_PERMANENT | 1001 INET_PROTOSW_ICSK, 1002 }, 1003 1004 { 1005 .type = SOCK_DGRAM, 1006 .protocol = IPPROTO_UDP, 1007 .prot = &udp_prot, 1008 .ops = &inet_dgram_ops, 1009 .flags = INET_PROTOSW_PERMANENT, 1010 }, 1011 1012 { 1013 .type = SOCK_DGRAM, 1014 .protocol = IPPROTO_ICMP, 1015 .prot = &ping_prot, 1016 .ops = &inet_dgram_ops, 1017 .flags = INET_PROTOSW_REUSE, 1018 }, 1019 1020 { 1021 .type = SOCK_RAW, 1022 .protocol = IPPROTO_IP, /* wild card */ 1023 .prot = &raw_prot, 1024 .ops = &inet_sockraw_ops, 1025 .flags = INET_PROTOSW_REUSE, 1026 } 1027}; 1028 1029#define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) 1030 1031void inet_register_protosw(struct inet_protosw *p) 1032{ 1033 struct list_head *lh; 1034 struct inet_protosw *answer; 1035 int protocol = p->protocol; 1036 struct list_head *last_perm; 1037 1038 spin_lock_bh(&inetsw_lock); 1039 1040 if (p->type >= SOCK_MAX) 1041 goto out_illegal; 1042 1043 /* If we are trying to override a permanent protocol, bail. */ 1044 answer = NULL; 1045 last_perm = &inetsw[p->type]; 1046 list_for_each(lh, &inetsw[p->type]) { 1047 answer = list_entry(lh, struct inet_protosw, list); 1048 1049 /* Check only the non-wild match. */ 1050 if (INET_PROTOSW_PERMANENT & answer->flags) { 1051 if (protocol == answer->protocol) 1052 break; 1053 last_perm = lh; 1054 } 1055 1056 answer = NULL; 1057 } 1058 if (answer) 1059 goto out_permanent; 1060 1061 /* Add the new entry after the last permanent entry if any, so that 1062 * the new entry does not override a permanent entry when matched with 1063 * a wild-card protocol. But it is allowed to override any existing 1064 * non-permanent entry. This means that when we remove this entry, the 1065 * system automatically returns to the old behavior. 1066 */ 1067 list_add_rcu(&p->list, last_perm); 1068out: 1069 spin_unlock_bh(&inetsw_lock); 1070 1071 return; 1072 1073out_permanent: 1074 pr_err("Attempt to override permanent protocol %d\n", protocol); 1075 goto out; 1076 1077out_illegal: 1078 pr_err("Ignoring attempt to register invalid socket type %d\n", 1079 p->type); 1080 goto out; 1081} 1082EXPORT_SYMBOL(inet_register_protosw); 1083 1084void inet_unregister_protosw(struct inet_protosw *p) 1085{ 1086 if (INET_PROTOSW_PERMANENT & p->flags) { 1087 pr_err("Attempt to unregister permanent protocol %d\n", 1088 p->protocol); 1089 } else { 1090 spin_lock_bh(&inetsw_lock); 1091 list_del_rcu(&p->list); 1092 spin_unlock_bh(&inetsw_lock); 1093 1094 synchronize_net(); 1095 } 1096} 1097EXPORT_SYMBOL(inet_unregister_protosw); 1098 1099/* 1100 * Shall we try to damage output packets if routing dev changes? 1101 */ 1102 1103int sysctl_ip_dynaddr __read_mostly; 1104 1105static int inet_sk_reselect_saddr(struct sock *sk) 1106{ 1107 struct inet_sock *inet = inet_sk(sk); 1108 __be32 old_saddr = inet->inet_saddr; 1109 __be32 daddr = inet->inet_daddr; 1110 struct flowi4 *fl4; 1111 struct rtable *rt; 1112 __be32 new_saddr; 1113 struct ip_options_rcu *inet_opt; 1114 1115 inet_opt = rcu_dereference_protected(inet->inet_opt, 1116 sock_owned_by_user(sk)); 1117 if (inet_opt && inet_opt->opt.srr) 1118 daddr = inet_opt->opt.faddr; 1119 1120 /* Query new route. */ 1121 fl4 = &inet->cork.fl.u.ip4; 1122 rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk), 1123 sk->sk_bound_dev_if, sk->sk_protocol, 1124 inet->inet_sport, inet->inet_dport, sk); 1125 if (IS_ERR(rt)) 1126 return PTR_ERR(rt); 1127 1128 sk_setup_caps(sk, &rt->dst); 1129 1130 new_saddr = fl4->saddr; 1131 1132 if (new_saddr == old_saddr) 1133 return 0; 1134 1135 if (sysctl_ip_dynaddr > 1) { 1136 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n", 1137 __func__, &old_saddr, &new_saddr); 1138 } 1139 1140 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr; 1141 1142 /* 1143 * XXX The only one ugly spot where we need to 1144 * XXX really change the sockets identity after 1145 * XXX it has entered the hashes. -DaveM 1146 * 1147 * Besides that, it does not check for connection 1148 * uniqueness. Wait for troubles. 1149 */ 1150 __sk_prot_rehash(sk); 1151 return 0; 1152} 1153 1154int inet_sk_rebuild_header(struct sock *sk) 1155{ 1156 struct inet_sock *inet = inet_sk(sk); 1157 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); 1158 __be32 daddr; 1159 struct ip_options_rcu *inet_opt; 1160 struct flowi4 *fl4; 1161 int err; 1162 1163 /* Route is OK, nothing to do. */ 1164 if (rt) 1165 return 0; 1166 1167 /* Reroute. */ 1168 rcu_read_lock(); 1169 inet_opt = rcu_dereference(inet->inet_opt); 1170 daddr = inet->inet_daddr; 1171 if (inet_opt && inet_opt->opt.srr) 1172 daddr = inet_opt->opt.faddr; 1173 rcu_read_unlock(); 1174 fl4 = &inet->cork.fl.u.ip4; 1175 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr, 1176 inet->inet_dport, inet->inet_sport, 1177 sk->sk_protocol, RT_CONN_FLAGS(sk), 1178 sk->sk_bound_dev_if); 1179 if (!IS_ERR(rt)) { 1180 err = 0; 1181 sk_setup_caps(sk, &rt->dst); 1182 } else { 1183 err = PTR_ERR(rt); 1184 1185 /* Routing failed... */ 1186 sk->sk_route_caps = 0; 1187 /* 1188 * Other protocols have to map its equivalent state to TCP_SYN_SENT. 1189 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme 1190 */ 1191 if (!sysctl_ip_dynaddr || 1192 sk->sk_state != TCP_SYN_SENT || 1193 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 1194 (err = inet_sk_reselect_saddr(sk)) != 0) 1195 sk->sk_err_soft = -err; 1196 } 1197 1198 return err; 1199} 1200EXPORT_SYMBOL(inet_sk_rebuild_header); 1201 1202static struct sk_buff *inet_gso_segment(struct sk_buff *skb, 1203 netdev_features_t features) 1204{ 1205 struct sk_buff *segs = ERR_PTR(-EINVAL); 1206 const struct net_offload *ops; 1207 unsigned int offset = 0; 1208 bool udpfrag, encap; 1209 struct iphdr *iph; 1210 int proto; 1211 int nhoff; 1212 int ihl; 1213 int id; 1214 1215 if (unlikely(skb_shinfo(skb)->gso_type & 1216 ~(SKB_GSO_TCPV4 | 1217 SKB_GSO_UDP | 1218 SKB_GSO_DODGY | 1219 SKB_GSO_TCP_ECN | 1220 SKB_GSO_GRE | 1221 SKB_GSO_GRE_CSUM | 1222 SKB_GSO_IPIP | 1223 SKB_GSO_SIT | 1224 SKB_GSO_TCPV6 | 1225 SKB_GSO_UDP_TUNNEL | 1226 SKB_GSO_UDP_TUNNEL_CSUM | 1227 SKB_GSO_TUNNEL_REMCSUM | 1228 0))) 1229 goto out; 1230 1231 skb_reset_network_header(skb); 1232 nhoff = skb_network_header(skb) - skb_mac_header(skb); 1233 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1234 goto out; 1235 1236 iph = ip_hdr(skb); 1237 ihl = iph->ihl * 4; 1238 if (ihl < sizeof(*iph)) 1239 goto out; 1240 1241 id = ntohs(iph->id); 1242 proto = iph->protocol; 1243 1244 /* Warning: after this point, iph might be no longer valid */ 1245 if (unlikely(!pskb_may_pull(skb, ihl))) 1246 goto out; 1247 __skb_pull(skb, ihl); 1248 1249 encap = SKB_GSO_CB(skb)->encap_level > 0; 1250 if (encap) 1251 features &= skb->dev->hw_enc_features; 1252 SKB_GSO_CB(skb)->encap_level += ihl; 1253 1254 skb_reset_transport_header(skb); 1255 1256 segs = ERR_PTR(-EPROTONOSUPPORT); 1257 1258 if (skb->encapsulation && 1259 skb_shinfo(skb)->gso_type & (SKB_GSO_SIT|SKB_GSO_IPIP)) 1260 udpfrag = proto == IPPROTO_UDP && encap; 1261 else 1262 udpfrag = proto == IPPROTO_UDP && !skb->encapsulation; 1263 1264 ops = rcu_dereference(inet_offloads[proto]); 1265 if (likely(ops && ops->callbacks.gso_segment)) 1266 segs = ops->callbacks.gso_segment(skb, features); 1267 1268 if (IS_ERR_OR_NULL(segs)) 1269 goto out; 1270 1271 skb = segs; 1272 do { 1273 iph = (struct iphdr *)(skb_mac_header(skb) + nhoff); 1274 if (udpfrag) { 1275 iph->id = htons(id); 1276 iph->frag_off = htons(offset >> 3); 1277 if (skb->next) 1278 iph->frag_off |= htons(IP_MF); 1279 offset += skb->len - nhoff - ihl; 1280 } else { 1281 iph->id = htons(id++); 1282 } 1283 iph->tot_len = htons(skb->len - nhoff); 1284 ip_send_check(iph); 1285 if (encap) 1286 skb_reset_inner_headers(skb); 1287 skb->network_header = (u8 *)iph - skb->head; 1288 } while ((skb = skb->next)); 1289 1290out: 1291 return segs; 1292} 1293 1294static struct sk_buff **inet_gro_receive(struct sk_buff **head, 1295 struct sk_buff *skb) 1296{ 1297 const struct net_offload *ops; 1298 struct sk_buff **pp = NULL; 1299 struct sk_buff *p; 1300 const struct iphdr *iph; 1301 unsigned int hlen; 1302 unsigned int off; 1303 unsigned int id; 1304 int flush = 1; 1305 int proto; 1306 1307 off = skb_gro_offset(skb); 1308 hlen = off + sizeof(*iph); 1309 iph = skb_gro_header_fast(skb, off); 1310 if (skb_gro_header_hard(skb, hlen)) { 1311 iph = skb_gro_header_slow(skb, hlen, off); 1312 if (unlikely(!iph)) 1313 goto out; 1314 } 1315 1316 proto = iph->protocol; 1317 1318 rcu_read_lock(); 1319 ops = rcu_dereference(inet_offloads[proto]); 1320 if (!ops || !ops->callbacks.gro_receive) 1321 goto out_unlock; 1322 1323 if (*(u8 *)iph != 0x45) 1324 goto out_unlock; 1325 1326 if (unlikely(ip_fast_csum((u8 *)iph, 5))) 1327 goto out_unlock; 1328 1329 id = ntohl(*(__be32 *)&iph->id); 1330 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF)); 1331 id >>= 16; 1332 1333 for (p = *head; p; p = p->next) { 1334 struct iphdr *iph2; 1335 1336 if (!NAPI_GRO_CB(p)->same_flow) 1337 continue; 1338 1339 iph2 = (struct iphdr *)(p->data + off); 1340 /* The above works because, with the exception of the top 1341 * (inner most) layer, we only aggregate pkts with the same 1342 * hdr length so all the hdrs we'll need to verify will start 1343 * at the same offset. 1344 */ 1345 if ((iph->protocol ^ iph2->protocol) | 1346 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) | 1347 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) { 1348 NAPI_GRO_CB(p)->same_flow = 0; 1349 continue; 1350 } 1351 1352 /* All fields must match except length and checksum. */ 1353 NAPI_GRO_CB(p)->flush |= 1354 (iph->ttl ^ iph2->ttl) | 1355 (iph->tos ^ iph2->tos) | 1356 ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF)); 1357 1358 /* Save the IP ID check to be included later when we get to 1359 * the transport layer so only the inner most IP ID is checked. 1360 * This is because some GSO/TSO implementations do not 1361 * correctly increment the IP ID for the outer hdrs. 1362 */ 1363 NAPI_GRO_CB(p)->flush_id = 1364 ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id); 1365 NAPI_GRO_CB(p)->flush |= flush; 1366 } 1367 1368 NAPI_GRO_CB(skb)->flush |= flush; 1369 skb_set_network_header(skb, off); 1370 /* The above will be needed by the transport layer if there is one 1371 * immediately following this IP hdr. 1372 */ 1373 1374 /* Note : No need to call skb_gro_postpull_rcsum() here, 1375 * as we already checked checksum over ipv4 header was 0 1376 */ 1377 skb_gro_pull(skb, sizeof(*iph)); 1378 skb_set_transport_header(skb, skb_gro_offset(skb)); 1379 1380 pp = ops->callbacks.gro_receive(head, skb); 1381 1382out_unlock: 1383 rcu_read_unlock(); 1384 1385out: 1386 NAPI_GRO_CB(skb)->flush |= flush; 1387 1388 return pp; 1389} 1390 1391int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 1392{ 1393 if (sk->sk_family == AF_INET) 1394 return ip_recv_error(sk, msg, len, addr_len); 1395#if IS_ENABLED(CONFIG_IPV6) 1396 if (sk->sk_family == AF_INET6) 1397 return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len); 1398#endif 1399 return -EINVAL; 1400} 1401 1402static int inet_gro_complete(struct sk_buff *skb, int nhoff) 1403{ 1404 __be16 newlen = htons(skb->len - nhoff); 1405 struct iphdr *iph = (struct iphdr *)(skb->data + nhoff); 1406 const struct net_offload *ops; 1407 int proto = iph->protocol; 1408 int err = -ENOSYS; 1409 1410 if (skb->encapsulation) 1411 skb_set_inner_network_header(skb, nhoff); 1412 1413 csum_replace2(&iph->check, iph->tot_len, newlen); 1414 iph->tot_len = newlen; 1415 1416 rcu_read_lock(); 1417 ops = rcu_dereference(inet_offloads[proto]); 1418 if (WARN_ON(!ops || !ops->callbacks.gro_complete)) 1419 goto out_unlock; 1420 1421 /* Only need to add sizeof(*iph) to get to the next hdr below 1422 * because any hdr with option will have been flushed in 1423 * inet_gro_receive(). 1424 */ 1425 err = ops->callbacks.gro_complete(skb, nhoff + sizeof(*iph)); 1426 1427out_unlock: 1428 rcu_read_unlock(); 1429 1430 return err; 1431} 1432 1433int inet_ctl_sock_create(struct sock **sk, unsigned short family, 1434 unsigned short type, unsigned char protocol, 1435 struct net *net) 1436{ 1437 struct socket *sock; 1438 int rc = sock_create_kern(family, type, protocol, &sock); 1439 1440 if (rc == 0) { 1441 *sk = sock->sk; 1442 (*sk)->sk_allocation = GFP_ATOMIC; 1443 /* 1444 * Unhash it so that IP input processing does not even see it, 1445 * we do not wish this socket to see incoming packets. 1446 */ 1447 (*sk)->sk_prot->unhash(*sk); 1448 1449 sk_change_net(*sk, net); 1450 } 1451 return rc; 1452} 1453EXPORT_SYMBOL_GPL(inet_ctl_sock_create); 1454 1455unsigned long snmp_fold_field(void __percpu *mib, int offt) 1456{ 1457 unsigned long res = 0; 1458 int i; 1459 1460 for_each_possible_cpu(i) 1461 res += *(((unsigned long *) per_cpu_ptr(mib, i)) + offt); 1462 return res; 1463} 1464EXPORT_SYMBOL_GPL(snmp_fold_field); 1465 1466#if BITS_PER_LONG==32 1467 1468u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset) 1469{ 1470 u64 res = 0; 1471 int cpu; 1472 1473 for_each_possible_cpu(cpu) { 1474 void *bhptr; 1475 struct u64_stats_sync *syncp; 1476 u64 v; 1477 unsigned int start; 1478 1479 bhptr = per_cpu_ptr(mib, cpu); 1480 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset); 1481 do { 1482 start = u64_stats_fetch_begin_irq(syncp); 1483 v = *(((u64 *) bhptr) + offt); 1484 } while (u64_stats_fetch_retry_irq(syncp, start)); 1485 1486 res += v; 1487 } 1488 return res; 1489} 1490EXPORT_SYMBOL_GPL(snmp_fold_field64); 1491#endif 1492 1493#ifdef CONFIG_IP_MULTICAST 1494static const struct net_protocol igmp_protocol = { 1495 .handler = igmp_rcv, 1496 .netns_ok = 1, 1497}; 1498#endif 1499 1500static const struct net_protocol tcp_protocol = { 1501 .early_demux = tcp_v4_early_demux, 1502 .handler = tcp_v4_rcv, 1503 .err_handler = tcp_v4_err, 1504 .no_policy = 1, 1505 .netns_ok = 1, 1506 .icmp_strict_tag_validation = 1, 1507}; 1508 1509static const struct net_protocol udp_protocol = { 1510 .early_demux = udp_v4_early_demux, 1511 .handler = udp_rcv, 1512 .err_handler = udp_err, 1513 .no_policy = 1, 1514 .netns_ok = 1, 1515}; 1516 1517static const struct net_protocol icmp_protocol = { 1518 .handler = icmp_rcv, 1519 .err_handler = icmp_err, 1520 .no_policy = 1, 1521 .netns_ok = 1, 1522}; 1523 1524static __net_init int ipv4_mib_init_net(struct net *net) 1525{ 1526 int i; 1527 1528 net->mib.tcp_statistics = alloc_percpu(struct tcp_mib); 1529 if (!net->mib.tcp_statistics) 1530 goto err_tcp_mib; 1531 net->mib.ip_statistics = alloc_percpu(struct ipstats_mib); 1532 if (!net->mib.ip_statistics) 1533 goto err_ip_mib; 1534 1535 for_each_possible_cpu(i) { 1536 struct ipstats_mib *af_inet_stats; 1537 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i); 1538 u64_stats_init(&af_inet_stats->syncp); 1539 } 1540 1541 net->mib.net_statistics = alloc_percpu(struct linux_mib); 1542 if (!net->mib.net_statistics) 1543 goto err_net_mib; 1544 net->mib.udp_statistics = alloc_percpu(struct udp_mib); 1545 if (!net->mib.udp_statistics) 1546 goto err_udp_mib; 1547 net->mib.udplite_statistics = alloc_percpu(struct udp_mib); 1548 if (!net->mib.udplite_statistics) 1549 goto err_udplite_mib; 1550 net->mib.icmp_statistics = alloc_percpu(struct icmp_mib); 1551 if (!net->mib.icmp_statistics) 1552 goto err_icmp_mib; 1553 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib), 1554 GFP_KERNEL); 1555 if (!net->mib.icmpmsg_statistics) 1556 goto err_icmpmsg_mib; 1557 1558 tcp_mib_init(net); 1559 return 0; 1560 1561err_icmpmsg_mib: 1562 free_percpu(net->mib.icmp_statistics); 1563err_icmp_mib: 1564 free_percpu(net->mib.udplite_statistics); 1565err_udplite_mib: 1566 free_percpu(net->mib.udp_statistics); 1567err_udp_mib: 1568 free_percpu(net->mib.net_statistics); 1569err_net_mib: 1570 free_percpu(net->mib.ip_statistics); 1571err_ip_mib: 1572 free_percpu(net->mib.tcp_statistics); 1573err_tcp_mib: 1574 return -ENOMEM; 1575} 1576 1577static __net_exit void ipv4_mib_exit_net(struct net *net) 1578{ 1579 kfree(net->mib.icmpmsg_statistics); 1580 free_percpu(net->mib.icmp_statistics); 1581 free_percpu(net->mib.udplite_statistics); 1582 free_percpu(net->mib.udp_statistics); 1583 free_percpu(net->mib.net_statistics); 1584 free_percpu(net->mib.ip_statistics); 1585 free_percpu(net->mib.tcp_statistics); 1586} 1587 1588static __net_initdata struct pernet_operations ipv4_mib_ops = { 1589 .init = ipv4_mib_init_net, 1590 .exit = ipv4_mib_exit_net, 1591}; 1592 1593static int __init init_ipv4_mibs(void) 1594{ 1595 return register_pernet_subsys(&ipv4_mib_ops); 1596} 1597 1598static __net_init int inet_init_net(struct net *net) 1599{ 1600 /* 1601 * Set defaults for local port range 1602 */ 1603 seqlock_init(&net->ipv4.ip_local_ports.lock); 1604 net->ipv4.ip_local_ports.range[0] = 32768; 1605 net->ipv4.ip_local_ports.range[1] = 61000; 1606 1607 seqlock_init(&net->ipv4.ping_group_range.lock); 1608 /* 1609 * Sane defaults - nobody may create ping sockets. 1610 * Boot scripts should set this to distro-specific group. 1611 */ 1612 net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1); 1613 net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0); 1614 return 0; 1615} 1616 1617static __net_exit void inet_exit_net(struct net *net) 1618{ 1619} 1620 1621static __net_initdata struct pernet_operations af_inet_ops = { 1622 .init = inet_init_net, 1623 .exit = inet_exit_net, 1624}; 1625 1626static int __init init_inet_pernet_ops(void) 1627{ 1628 return register_pernet_subsys(&af_inet_ops); 1629} 1630 1631static int ipv4_proc_init(void); 1632 1633/* 1634 * IP protocol layer initialiser 1635 */ 1636 1637static struct packet_offload ip_packet_offload __read_mostly = { 1638 .type = cpu_to_be16(ETH_P_IP), 1639 .callbacks = { 1640 .gso_segment = inet_gso_segment, 1641 .gro_receive = inet_gro_receive, 1642 .gro_complete = inet_gro_complete, 1643 }, 1644}; 1645 1646static const struct net_offload ipip_offload = { 1647 .callbacks = { 1648 .gso_segment = inet_gso_segment, 1649 .gro_receive = inet_gro_receive, 1650 .gro_complete = inet_gro_complete, 1651 }, 1652}; 1653 1654static int __init ipv4_offload_init(void) 1655{ 1656 /* 1657 * Add offloads 1658 */ 1659 if (udpv4_offload_init() < 0) 1660 pr_crit("%s: Cannot add UDP protocol offload\n", __func__); 1661 if (tcpv4_offload_init() < 0) 1662 pr_crit("%s: Cannot add TCP protocol offload\n", __func__); 1663 1664 dev_add_offload(&ip_packet_offload); 1665 inet_add_offload(&ipip_offload, IPPROTO_IPIP); 1666 return 0; 1667} 1668 1669fs_initcall(ipv4_offload_init); 1670 1671static struct packet_type ip_packet_type __read_mostly = { 1672 .type = cpu_to_be16(ETH_P_IP), 1673 .func = ip_rcv, 1674}; 1675 1676static int __init inet_init(void) 1677{ 1678 struct inet_protosw *q; 1679 struct list_head *r; 1680 int rc = -EINVAL; 1681 1682 sock_skb_cb_check_size(sizeof(struct inet_skb_parm)); 1683 1684 rc = proto_register(&tcp_prot, 1); 1685 if (rc) 1686 goto out; 1687 1688 rc = proto_register(&udp_prot, 1); 1689 if (rc) 1690 goto out_unregister_tcp_proto; 1691 1692 rc = proto_register(&raw_prot, 1); 1693 if (rc) 1694 goto out_unregister_udp_proto; 1695 1696 rc = proto_register(&ping_prot, 1); 1697 if (rc) 1698 goto out_unregister_raw_proto; 1699 1700 /* 1701 * Tell SOCKET that we are alive... 1702 */ 1703 1704 (void)sock_register(&inet_family_ops); 1705 1706#ifdef CONFIG_SYSCTL 1707 ip_static_sysctl_init(); 1708#endif 1709 1710 /* 1711 * Add all the base protocols. 1712 */ 1713 1714 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 1715 pr_crit("%s: Cannot add ICMP protocol\n", __func__); 1716 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) 1717 pr_crit("%s: Cannot add UDP protocol\n", __func__); 1718 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) 1719 pr_crit("%s: Cannot add TCP protocol\n", __func__); 1720#ifdef CONFIG_IP_MULTICAST 1721 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 1722 pr_crit("%s: Cannot add IGMP protocol\n", __func__); 1723#endif 1724 1725 /* Register the socket-side information for inet_create. */ 1726 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 1727 INIT_LIST_HEAD(r); 1728 1729 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 1730 inet_register_protosw(q); 1731 1732 /* 1733 * Set the ARP module up 1734 */ 1735 1736 arp_init(); 1737 1738 /* 1739 * Set the IP module up 1740 */ 1741 1742 ip_init(); 1743 1744 tcp_v4_init(); 1745 1746 /* Setup TCP slab cache for open requests. */ 1747 tcp_init(); 1748 1749 /* Setup UDP memory threshold */ 1750 udp_init(); 1751 1752 /* Add UDP-Lite (RFC 3828) */ 1753 udplite4_register(); 1754 1755 ping_init(); 1756 1757 /* 1758 * Set the ICMP layer up 1759 */ 1760 1761 if (icmp_init() < 0) 1762 panic("Failed to create the ICMP control socket.\n"); 1763 1764 /* 1765 * Initialise the multicast router 1766 */ 1767#if defined(CONFIG_IP_MROUTE) 1768 if (ip_mr_init()) 1769 pr_crit("%s: Cannot init ipv4 mroute\n", __func__); 1770#endif 1771 1772 if (init_inet_pernet_ops()) 1773 pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__); 1774 /* 1775 * Initialise per-cpu ipv4 mibs 1776 */ 1777 1778 if (init_ipv4_mibs()) 1779 pr_crit("%s: Cannot init ipv4 mibs\n", __func__); 1780 1781 ipv4_proc_init(); 1782 1783 ipfrag_init(); 1784 1785 dev_add_pack(&ip_packet_type); 1786 1787 rc = 0; 1788out: 1789 return rc; 1790out_unregister_raw_proto: 1791 proto_unregister(&raw_prot); 1792out_unregister_udp_proto: 1793 proto_unregister(&udp_prot); 1794out_unregister_tcp_proto: 1795 proto_unregister(&tcp_prot); 1796 goto out; 1797} 1798 1799fs_initcall(inet_init); 1800 1801/* ------------------------------------------------------------------------ */ 1802 1803#ifdef CONFIG_PROC_FS 1804static int __init ipv4_proc_init(void) 1805{ 1806 int rc = 0; 1807 1808 if (raw_proc_init()) 1809 goto out_raw; 1810 if (tcp4_proc_init()) 1811 goto out_tcp; 1812 if (udp4_proc_init()) 1813 goto out_udp; 1814 if (ping_proc_init()) 1815 goto out_ping; 1816 if (ip_misc_proc_init()) 1817 goto out_misc; 1818out: 1819 return rc; 1820out_misc: 1821 ping_proc_exit(); 1822out_ping: 1823 udp4_proc_exit(); 1824out_udp: 1825 tcp4_proc_exit(); 1826out_tcp: 1827 raw_proc_exit(); 1828out_raw: 1829 rc = -ENOMEM; 1830 goto out; 1831} 1832 1833#else /* CONFIG_PROC_FS */ 1834static int __init ipv4_proc_init(void) 1835{ 1836 return 0; 1837} 1838#endif /* CONFIG_PROC_FS */ 1839 1840MODULE_ALIAS_NETPROTO(PF_INET); 1841 1842