1 /* 2 * INET An implementation of the TCP/IP protocol suite for the LINUX 3 * operating system. INET is implemented using the BSD Socket 4 * interface as the means of communication with the user level. 5 * 6 * PF_INET protocol family socket handler. 7 * 8 * Authors: Ross Biro 9 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 10 * Florian La Roche, <flla@stud.uni-sb.de> 11 * Alan Cox, <A.Cox@swansea.ac.uk> 12 * 13 * Changes (see also sock.c) 14 * 15 * piggy, 16 * Karl Knutson : Socket protocol table 17 * A.N.Kuznetsov : Socket death error in accept(). 18 * John Richardson : Fix non blocking error in connect() 19 * so sockets that fail to connect 20 * don't return -EINPROGRESS. 21 * Alan Cox : Asynchronous I/O support 22 * Alan Cox : Keep correct socket pointer on sock 23 * structures 24 * when accept() ed 25 * Alan Cox : Semantics of SO_LINGER aren't state 26 * moved to close when you look carefully. 27 * With this fixed and the accept bug fixed 28 * some RPC stuff seems happier. 29 * Niibe Yutaka : 4.4BSD style write async I/O 30 * Alan Cox, 31 * Tony Gale : Fixed reuse semantics. 32 * Alan Cox : bind() shouldn't abort existing but dead 33 * sockets. Stops FTP netin:.. I hope. 34 * Alan Cox : bind() works correctly for RAW sockets. 35 * Note that FreeBSD at least was broken 36 * in this respect so be careful with 37 * compatibility tests... 38 * Alan Cox : routing cache support 39 * Alan Cox : memzero the socket structure for 40 * compactness. 41 * Matt Day : nonblock connect error handler 42 * Alan Cox : Allow large numbers of pending sockets 43 * (eg for big web sites), but only if 44 * specifically application requested. 45 * Alan Cox : New buffering throughout IP. Used 46 * dumbly. 47 * Alan Cox : New buffering now used smartly. 48 * Alan Cox : BSD rather than common sense 49 * interpretation of listen. 50 * Germano Caronni : Assorted small races. 51 * Alan Cox : sendmsg/recvmsg basic support. 52 * Alan Cox : Only sendmsg/recvmsg now supported. 53 * Alan Cox : Locked down bind (see security list). 54 * Alan Cox : Loosened bind a little. 55 * Mike McLagan : ADD/DEL DLCI Ioctls 56 * Willy Konynenberg : Transparent proxying support. 57 * David S. Miller : New socket lookup architecture. 58 * Some other random speedups. 59 * Cyrus Durgin : Cleaned up file for kmod hacks. 60 * Andi Kleen : Fix inet_stream_connect TCP race. 61 * 62 * This program is free software; you can redistribute it and/or 63 * modify it under the terms of the GNU General Public License 64 * as published by the Free Software Foundation; either version 65 * 2 of the License, or (at your option) any later version. 66 */ 67 68 #include <linux/err.h> 69 #include <linux/errno.h> 70 #include <linux/types.h> 71 #include <linux/socket.h> 72 #include <linux/in.h> 73 #include <linux/kernel.h> 74 #include <linux/module.h> 75 #include <linux/sched.h> 76 #include <linux/timer.h> 77 #include <linux/string.h> 78 #include <linux/sockios.h> 79 #include <linux/net.h> 80 #include <linux/capability.h> 81 #include <linux/fcntl.h> 82 #include <linux/mm.h> 83 #include <linux/interrupt.h> 84 #include <linux/stat.h> 85 #include <linux/init.h> 86 #include <linux/poll.h> 87 #include <linux/netfilter_ipv4.h> 88 #include <linux/random.h> 89 #include <linux/slab.h> 90 91 #include <asm/uaccess.h> 92 #include <asm/system.h> 93 94 #include <linux/inet.h> 95 #include <linux/igmp.h> 96 #include <linux/inetdevice.h> 97 #include <linux/netdevice.h> 98 #include <net/checksum.h> 99 #include <net/ip.h> 100 #include <net/protocol.h> 101 #include <net/arp.h> 102 #include <net/route.h> 103 #include <net/ip_fib.h> 104 #include <net/inet_connection_sock.h> 105 #include <net/tcp.h> 106 #include <net/udp.h> 107 #include <net/udplite.h> 108 #include <net/ping.h> 109 #include <linux/skbuff.h> 110 #include <net/sock.h> 111 #include <net/raw.h> 112 #include <net/icmp.h> 113 #include <net/ipip.h> 114 #include <net/inet_common.h> 115 #include <net/xfrm.h> 116 #include <net/net_namespace.h> 117 #ifdef CONFIG_IP_MROUTE 118 #include <linux/mroute.h> 119 #endif 120 121 122 /* The inetsw table contains everything that inet_create needs to 123 * build a new socket. 124 */ 125 static struct list_head inetsw[SOCK_MAX]; 126 static DEFINE_SPINLOCK(inetsw_lock); 127 128 struct ipv4_config ipv4_config; 129 EXPORT_SYMBOL(ipv4_config); 130 131 /* New destruction routine */ 132 133 void inet_sock_destruct(struct sock *sk) 134 { 135 struct inet_sock *inet = inet_sk(sk); 136 137 __skb_queue_purge(&sk->sk_receive_queue); 138 __skb_queue_purge(&sk->sk_error_queue); 139 140 sk_mem_reclaim(sk); 141 142 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) { 143 pr_err("Attempt to release TCP socket in state %d %p\n", 144 sk->sk_state, sk); 145 return; 146 } 147 if (!sock_flag(sk, SOCK_DEAD)) { 148 pr_err("Attempt to release alive inet socket %p\n", sk); 149 return; 150 } 151 152 WARN_ON(atomic_read(&sk->sk_rmem_alloc)); 153 WARN_ON(atomic_read(&sk->sk_wmem_alloc)); 154 WARN_ON(sk->sk_wmem_queued); 155 WARN_ON(sk->sk_forward_alloc); 156 157 kfree(rcu_dereference_protected(inet->inet_opt, 1)); 158 dst_release(rcu_dereference_check(sk->sk_dst_cache, 1)); 159 sk_refcnt_debug_dec(sk); 160 } 161 EXPORT_SYMBOL(inet_sock_destruct); 162 163 /* 164 * The routines beyond this point handle the behaviour of an AF_INET 165 * socket object. Mostly it punts to the subprotocols of IP to do 166 * the work. 167 */ 168 169 /* 170 * Automatically bind an unbound socket. 171 */ 172 173 static int inet_autobind(struct sock *sk) 174 { 175 struct inet_sock *inet; 176 /* We may need to bind the socket. */ 177 lock_sock(sk); 178 inet = inet_sk(sk); 179 if (!inet->inet_num) { 180 if (sk->sk_prot->get_port(sk, 0)) { 181 release_sock(sk); 182 return -EAGAIN; 183 } 184 inet->inet_sport = htons(inet->inet_num); 185 } 186 release_sock(sk); 187 return 0; 188 } 189 190 /* 191 * Move a socket into listening state. 192 */ 193 int inet_listen(struct socket *sock, int backlog) 194 { 195 struct sock *sk = sock->sk; 196 unsigned char old_state; 197 int err; 198 199 lock_sock(sk); 200 201 err = -EINVAL; 202 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM) 203 goto out; 204 205 old_state = sk->sk_state; 206 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN))) 207 goto out; 208 209 /* Really, if the socket is already in listen state 210 * we can only allow the backlog to be adjusted. 211 */ 212 if (old_state != TCP_LISTEN) { 213 err = inet_csk_listen_start(sk, backlog); 214 if (err) 215 goto out; 216 } 217 sk->sk_max_ack_backlog = backlog; 218 err = 0; 219 220 out: 221 release_sock(sk); 222 return err; 223 } 224 EXPORT_SYMBOL(inet_listen); 225 226 u32 inet_ehash_secret __read_mostly; 227 EXPORT_SYMBOL(inet_ehash_secret); 228 229 /* 230 * inet_ehash_secret must be set exactly once 231 */ 232 void build_ehash_secret(void) 233 { 234 u32 rnd; 235 236 do { 237 get_random_bytes(&rnd, sizeof(rnd)); 238 } while (rnd == 0); 239 240 cmpxchg(&inet_ehash_secret, 0, rnd); 241 } 242 EXPORT_SYMBOL(build_ehash_secret); 243 244 static inline int inet_netns_ok(struct net *net, int protocol) 245 { 246 int hash; 247 const struct net_protocol *ipprot; 248 249 if (net_eq(net, &init_net)) 250 return 1; 251 252 hash = protocol & (MAX_INET_PROTOS - 1); 253 ipprot = rcu_dereference(inet_protos[hash]); 254 255 if (ipprot == NULL) 256 /* raw IP is OK */ 257 return 1; 258 return ipprot->netns_ok; 259 } 260 261 /* 262 * Create an inet socket. 263 */ 264 265 static int inet_create(struct net *net, struct socket *sock, int protocol, 266 int kern) 267 { 268 struct sock *sk; 269 struct inet_protosw *answer; 270 struct inet_sock *inet; 271 struct proto *answer_prot; 272 unsigned char answer_flags; 273 char answer_no_check; 274 int try_loading_module = 0; 275 int err; 276 277 if (unlikely(!inet_ehash_secret)) 278 if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM) 279 build_ehash_secret(); 280 281 sock->state = SS_UNCONNECTED; 282 283 /* Look for the requested type/protocol pair. */ 284 lookup_protocol: 285 err = -ESOCKTNOSUPPORT; 286 rcu_read_lock(); 287 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) { 288 289 err = 0; 290 /* Check the non-wild match. */ 291 if (protocol == answer->protocol) { 292 if (protocol != IPPROTO_IP) 293 break; 294 } else { 295 /* Check for the two wild cases. */ 296 if (IPPROTO_IP == protocol) { 297 protocol = answer->protocol; 298 break; 299 } 300 if (IPPROTO_IP == answer->protocol) 301 break; 302 } 303 err = -EPROTONOSUPPORT; 304 } 305 306 if (unlikely(err)) { 307 if (try_loading_module < 2) { 308 rcu_read_unlock(); 309 /* 310 * Be more specific, e.g. net-pf-2-proto-132-type-1 311 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) 312 */ 313 if (++try_loading_module == 1) 314 request_module("net-pf-%d-proto-%d-type-%d", 315 PF_INET, protocol, sock->type); 316 /* 317 * Fall back to generic, e.g. net-pf-2-proto-132 318 * (net-pf-PF_INET-proto-IPPROTO_SCTP) 319 */ 320 else 321 request_module("net-pf-%d-proto-%d", 322 PF_INET, protocol); 323 goto lookup_protocol; 324 } else 325 goto out_rcu_unlock; 326 } 327 328 err = -EPERM; 329 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW)) 330 goto out_rcu_unlock; 331 332 err = -EAFNOSUPPORT; 333 if (!inet_netns_ok(net, protocol)) 334 goto out_rcu_unlock; 335 336 sock->ops = answer->ops; 337 answer_prot = answer->prot; 338 answer_no_check = answer->no_check; 339 answer_flags = answer->flags; 340 rcu_read_unlock(); 341 342 WARN_ON(answer_prot->slab == NULL); 343 344 err = -ENOBUFS; 345 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot); 346 if (sk == NULL) 347 goto out; 348 349 err = 0; 350 sk->sk_no_check = answer_no_check; 351 if (INET_PROTOSW_REUSE & answer_flags) 352 sk->sk_reuse = 1; 353 354 inet = inet_sk(sk); 355 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 356 357 inet->nodefrag = 0; 358 359 if (SOCK_RAW == sock->type) { 360 inet->inet_num = protocol; 361 if (IPPROTO_RAW == protocol) 362 inet->hdrincl = 1; 363 } 364 365 if (ipv4_config.no_pmtu_disc) 366 inet->pmtudisc = IP_PMTUDISC_DONT; 367 else 368 inet->pmtudisc = IP_PMTUDISC_WANT; 369 370 inet->inet_id = 0; 371 372 sock_init_data(sock, sk); 373 374 sk->sk_destruct = inet_sock_destruct; 375 sk->sk_protocol = protocol; 376 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 377 378 inet->uc_ttl = -1; 379 inet->mc_loop = 1; 380 inet->mc_ttl = 1; 381 inet->mc_all = 1; 382 inet->mc_index = 0; 383 inet->mc_list = NULL; 384 385 sk_refcnt_debug_inc(sk); 386 387 if (inet->inet_num) { 388 /* It assumes that any protocol which allows 389 * the user to assign a number at socket 390 * creation time automatically 391 * shares. 392 */ 393 inet->inet_sport = htons(inet->inet_num); 394 /* Add to protocol hash chains. */ 395 sk->sk_prot->hash(sk); 396 } 397 398 if (sk->sk_prot->init) { 399 err = sk->sk_prot->init(sk); 400 if (err) 401 sk_common_release(sk); 402 } 403 out: 404 return err; 405 out_rcu_unlock: 406 rcu_read_unlock(); 407 goto out; 408 } 409 410 411 /* 412 * The peer socket should always be NULL (or else). When we call this 413 * function we are destroying the object and from then on nobody 414 * should refer to it. 415 */ 416 int inet_release(struct socket *sock) 417 { 418 struct sock *sk = sock->sk; 419 420 if (sk) { 421 long timeout; 422 423 sock_rps_reset_flow(sk); 424 425 /* Applications forget to leave groups before exiting */ 426 ip_mc_drop_socket(sk); 427 428 /* If linger is set, we don't return until the close 429 * is complete. Otherwise we return immediately. The 430 * actually closing is done the same either way. 431 * 432 * If the close is due to the process exiting, we never 433 * linger.. 434 */ 435 timeout = 0; 436 if (sock_flag(sk, SOCK_LINGER) && 437 !(current->flags & PF_EXITING)) 438 timeout = sk->sk_lingertime; 439 sock->sk = NULL; 440 sk->sk_prot->close(sk, timeout); 441 } 442 return 0; 443 } 444 EXPORT_SYMBOL(inet_release); 445 446 /* It is off by default, see below. */ 447 int sysctl_ip_nonlocal_bind __read_mostly; 448 EXPORT_SYMBOL(sysctl_ip_nonlocal_bind); 449 450 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 451 { 452 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 453 struct sock *sk = sock->sk; 454 struct inet_sock *inet = inet_sk(sk); 455 unsigned short snum; 456 int chk_addr_ret; 457 int err; 458 459 /* If the socket has its own bind function then use it. (RAW) */ 460 if (sk->sk_prot->bind) { 461 err = sk->sk_prot->bind(sk, uaddr, addr_len); 462 goto out; 463 } 464 err = -EINVAL; 465 if (addr_len < sizeof(struct sockaddr_in)) 466 goto out; 467 468 if (addr->sin_family != AF_INET) { 469 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET) 470 * only if s_addr is INADDR_ANY. 471 */ 472 err = -EAFNOSUPPORT; 473 if (addr->sin_family != AF_UNSPEC || 474 addr->sin_addr.s_addr != htonl(INADDR_ANY)) 475 goto out; 476 } 477 478 chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr); 479 480 /* Not specified by any standard per-se, however it breaks too 481 * many applications when removed. It is unfortunate since 482 * allowing applications to make a non-local bind solves 483 * several problems with systems using dynamic addressing. 484 * (ie. your servers still start up even if your ISDN link 485 * is temporarily down) 486 */ 487 err = -EADDRNOTAVAIL; 488 if (!sysctl_ip_nonlocal_bind && 489 !(inet->freebind || inet->transparent) && 490 addr->sin_addr.s_addr != htonl(INADDR_ANY) && 491 chk_addr_ret != RTN_LOCAL && 492 chk_addr_ret != RTN_MULTICAST && 493 chk_addr_ret != RTN_BROADCAST) 494 goto out; 495 496 snum = ntohs(addr->sin_port); 497 err = -EACCES; 498 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) 499 goto out; 500 501 /* We keep a pair of addresses. rcv_saddr is the one 502 * used by hash lookups, and saddr is used for transmit. 503 * 504 * In the BSD API these are the same except where it 505 * would be illegal to use them (multicast/broadcast) in 506 * which case the sending device address is used. 507 */ 508 lock_sock(sk); 509 510 /* Check these errors (active socket, double bind). */ 511 err = -EINVAL; 512 if (sk->sk_state != TCP_CLOSE || inet->inet_num) 513 goto out_release_sock; 514 515 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 516 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 517 inet->inet_saddr = 0; /* Use device */ 518 519 /* Make sure we are allowed to bind here. */ 520 if (sk->sk_prot->get_port(sk, snum)) { 521 inet->inet_saddr = inet->inet_rcv_saddr = 0; 522 err = -EADDRINUSE; 523 goto out_release_sock; 524 } 525 526 if (inet->inet_rcv_saddr) 527 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 528 if (snum) 529 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 530 inet->inet_sport = htons(inet->inet_num); 531 inet->inet_daddr = 0; 532 inet->inet_dport = 0; 533 sk_dst_reset(sk); 534 err = 0; 535 out_release_sock: 536 release_sock(sk); 537 out: 538 return err; 539 } 540 EXPORT_SYMBOL(inet_bind); 541 542 int inet_dgram_connect(struct socket *sock, struct sockaddr * uaddr, 543 int addr_len, int flags) 544 { 545 struct sock *sk = sock->sk; 546 547 if (addr_len < sizeof(uaddr->sa_family)) 548 return -EINVAL; 549 if (uaddr->sa_family == AF_UNSPEC) 550 return sk->sk_prot->disconnect(sk, flags); 551 552 if (!inet_sk(sk)->inet_num && inet_autobind(sk)) 553 return -EAGAIN; 554 return sk->sk_prot->connect(sk, (struct sockaddr *)uaddr, addr_len); 555 } 556 EXPORT_SYMBOL(inet_dgram_connect); 557 558 static long inet_wait_for_connect(struct sock *sk, long timeo) 559 { 560 DEFINE_WAIT(wait); 561 562 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 563 564 /* Basic assumption: if someone sets sk->sk_err, he _must_ 565 * change state of the socket from TCP_SYN_*. 566 * Connect() does not allow to get error notifications 567 * without closing the socket. 568 */ 569 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 570 release_sock(sk); 571 timeo = schedule_timeout(timeo); 572 lock_sock(sk); 573 if (signal_pending(current) || !timeo) 574 break; 575 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 576 } 577 finish_wait(sk_sleep(sk), &wait); 578 return timeo; 579 } 580 581 /* 582 * Connect to a remote host. There is regrettably still a little 583 * TCP 'magic' in here. 584 */ 585 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 586 int addr_len, int flags) 587 { 588 struct sock *sk = sock->sk; 589 int err; 590 long timeo; 591 592 if (addr_len < sizeof(uaddr->sa_family)) 593 return -EINVAL; 594 595 lock_sock(sk); 596 597 if (uaddr->sa_family == AF_UNSPEC) { 598 err = sk->sk_prot->disconnect(sk, flags); 599 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 600 goto out; 601 } 602 603 switch (sock->state) { 604 default: 605 err = -EINVAL; 606 goto out; 607 case SS_CONNECTED: 608 err = -EISCONN; 609 goto out; 610 case SS_CONNECTING: 611 err = -EALREADY; 612 /* Fall out of switch with err, set for this state */ 613 break; 614 case SS_UNCONNECTED: 615 err = -EISCONN; 616 if (sk->sk_state != TCP_CLOSE) 617 goto out; 618 619 err = sk->sk_prot->connect(sk, uaddr, addr_len); 620 if (err < 0) 621 goto out; 622 623 sock->state = SS_CONNECTING; 624 625 /* Just entered SS_CONNECTING state; the only 626 * difference is that return value in non-blocking 627 * case is EINPROGRESS, rather than EALREADY. 628 */ 629 err = -EINPROGRESS; 630 break; 631 } 632 633 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 634 635 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 636 /* Error code is set above */ 637 if (!timeo || !inet_wait_for_connect(sk, timeo)) 638 goto out; 639 640 err = sock_intr_errno(timeo); 641 if (signal_pending(current)) 642 goto out; 643 } 644 645 /* Connection was closed by RST, timeout, ICMP error 646 * or another process disconnected us. 647 */ 648 if (sk->sk_state == TCP_CLOSE) 649 goto sock_error; 650 651 /* sk->sk_err may be not zero now, if RECVERR was ordered by user 652 * and error was received after socket entered established state. 653 * Hence, it is handled normally after connect() return successfully. 654 */ 655 656 sock->state = SS_CONNECTED; 657 err = 0; 658 out: 659 release_sock(sk); 660 return err; 661 662 sock_error: 663 err = sock_error(sk) ? : -ECONNABORTED; 664 sock->state = SS_UNCONNECTED; 665 if (sk->sk_prot->disconnect(sk, flags)) 666 sock->state = SS_DISCONNECTING; 667 goto out; 668 } 669 EXPORT_SYMBOL(inet_stream_connect); 670 671 /* 672 * Accept a pending connection. The TCP layer now gives BSD semantics. 673 */ 674 675 int inet_accept(struct socket *sock, struct socket *newsock, int flags) 676 { 677 struct sock *sk1 = sock->sk; 678 int err = -EINVAL; 679 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err); 680 681 if (!sk2) 682 goto do_err; 683 684 lock_sock(sk2); 685 686 sock_rps_record_flow(sk2); 687 WARN_ON(!((1 << sk2->sk_state) & 688 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE))); 689 690 sock_graft(sk2, newsock); 691 692 newsock->state = SS_CONNECTED; 693 err = 0; 694 release_sock(sk2); 695 do_err: 696 return err; 697 } 698 EXPORT_SYMBOL(inet_accept); 699 700 701 /* 702 * This does both peername and sockname. 703 */ 704 int inet_getname(struct socket *sock, struct sockaddr *uaddr, 705 int *uaddr_len, int peer) 706 { 707 struct sock *sk = sock->sk; 708 struct inet_sock *inet = inet_sk(sk); 709 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr); 710 711 sin->sin_family = AF_INET; 712 if (peer) { 713 if (!inet->inet_dport || 714 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 715 peer == 1)) 716 return -ENOTCONN; 717 sin->sin_port = inet->inet_dport; 718 sin->sin_addr.s_addr = inet->inet_daddr; 719 } else { 720 __be32 addr = inet->inet_rcv_saddr; 721 if (!addr) 722 addr = inet->inet_saddr; 723 sin->sin_port = inet->inet_sport; 724 sin->sin_addr.s_addr = addr; 725 } 726 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 727 *uaddr_len = sizeof(*sin); 728 return 0; 729 } 730 EXPORT_SYMBOL(inet_getname); 731 732 int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 733 size_t size) 734 { 735 struct sock *sk = sock->sk; 736 737 sock_rps_record_flow(sk); 738 739 /* We may need to bind the socket. */ 740 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 741 inet_autobind(sk)) 742 return -EAGAIN; 743 744 return sk->sk_prot->sendmsg(iocb, sk, msg, size); 745 } 746 EXPORT_SYMBOL(inet_sendmsg); 747 748 ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, 749 size_t size, int flags) 750 { 751 struct sock *sk = sock->sk; 752 753 sock_rps_record_flow(sk); 754 755 /* We may need to bind the socket. */ 756 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 757 inet_autobind(sk)) 758 return -EAGAIN; 759 760 if (sk->sk_prot->sendpage) 761 return sk->sk_prot->sendpage(sk, page, offset, size, flags); 762 return sock_no_sendpage(sock, page, offset, size, flags); 763 } 764 EXPORT_SYMBOL(inet_sendpage); 765 766 int inet_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 767 size_t size, int flags) 768 { 769 struct sock *sk = sock->sk; 770 int addr_len = 0; 771 int err; 772 773 sock_rps_record_flow(sk); 774 775 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, 776 flags & ~MSG_DONTWAIT, &addr_len); 777 if (err >= 0) 778 msg->msg_namelen = addr_len; 779 return err; 780 } 781 EXPORT_SYMBOL(inet_recvmsg); 782 783 int inet_shutdown(struct socket *sock, int how) 784 { 785 struct sock *sk = sock->sk; 786 int err = 0; 787 788 /* This should really check to make sure 789 * the socket is a TCP socket. (WHY AC...) 790 */ 791 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and 792 1->2 bit 2 snds. 793 2->3 */ 794 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ 795 return -EINVAL; 796 797 lock_sock(sk); 798 if (sock->state == SS_CONNECTING) { 799 if ((1 << sk->sk_state) & 800 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) 801 sock->state = SS_DISCONNECTING; 802 else 803 sock->state = SS_CONNECTED; 804 } 805 806 switch (sk->sk_state) { 807 case TCP_CLOSE: 808 err = -ENOTCONN; 809 /* Hack to wake up other listeners, who can poll for 810 POLLHUP, even on eg. unconnected UDP sockets -- RR */ 811 default: 812 sk->sk_shutdown |= how; 813 if (sk->sk_prot->shutdown) 814 sk->sk_prot->shutdown(sk, how); 815 break; 816 817 /* Remaining two branches are temporary solution for missing 818 * close() in multithreaded environment. It is _not_ a good idea, 819 * but we have no choice until close() is repaired at VFS level. 820 */ 821 case TCP_LISTEN: 822 if (!(how & RCV_SHUTDOWN)) 823 break; 824 /* Fall through */ 825 case TCP_SYN_SENT: 826 err = sk->sk_prot->disconnect(sk, O_NONBLOCK); 827 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 828 break; 829 } 830 831 /* Wake up anyone sleeping in poll. */ 832 sk->sk_state_change(sk); 833 release_sock(sk); 834 return err; 835 } 836 EXPORT_SYMBOL(inet_shutdown); 837 838 /* 839 * ioctl() calls you can issue on an INET socket. Most of these are 840 * device configuration and stuff and very rarely used. Some ioctls 841 * pass on to the socket itself. 842 * 843 * NOTE: I like the idea of a module for the config stuff. ie ifconfig 844 * loads the devconfigure module does its configuring and unloads it. 845 * There's a good 20K of config code hanging around the kernel. 846 */ 847 848 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 849 { 850 struct sock *sk = sock->sk; 851 int err = 0; 852 struct net *net = sock_net(sk); 853 854 switch (cmd) { 855 case SIOCGSTAMP: 856 err = sock_get_timestamp(sk, (struct timeval __user *)arg); 857 break; 858 case SIOCGSTAMPNS: 859 err = sock_get_timestampns(sk, (struct timespec __user *)arg); 860 break; 861 case SIOCADDRT: 862 case SIOCDELRT: 863 case SIOCRTMSG: 864 err = ip_rt_ioctl(net, cmd, (void __user *)arg); 865 break; 866 case SIOCDARP: 867 case SIOCGARP: 868 case SIOCSARP: 869 err = arp_ioctl(net, cmd, (void __user *)arg); 870 break; 871 case SIOCGIFADDR: 872 case SIOCSIFADDR: 873 case SIOCGIFBRDADDR: 874 case SIOCSIFBRDADDR: 875 case SIOCGIFNETMASK: 876 case SIOCSIFNETMASK: 877 case SIOCGIFDSTADDR: 878 case SIOCSIFDSTADDR: 879 case SIOCSIFPFLAGS: 880 case SIOCGIFPFLAGS: 881 case SIOCSIFFLAGS: 882 err = devinet_ioctl(net, cmd, (void __user *)arg); 883 break; 884 default: 885 if (sk->sk_prot->ioctl) 886 err = sk->sk_prot->ioctl(sk, cmd, arg); 887 else 888 err = -ENOIOCTLCMD; 889 break; 890 } 891 return err; 892 } 893 EXPORT_SYMBOL(inet_ioctl); 894 895 #ifdef CONFIG_COMPAT 896 static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 897 { 898 struct sock *sk = sock->sk; 899 int err = -ENOIOCTLCMD; 900 901 if (sk->sk_prot->compat_ioctl) 902 err = sk->sk_prot->compat_ioctl(sk, cmd, arg); 903 904 return err; 905 } 906 #endif 907 908 const struct proto_ops inet_stream_ops = { 909 .family = PF_INET, 910 .owner = THIS_MODULE, 911 .release = inet_release, 912 .bind = inet_bind, 913 .connect = inet_stream_connect, 914 .socketpair = sock_no_socketpair, 915 .accept = inet_accept, 916 .getname = inet_getname, 917 .poll = tcp_poll, 918 .ioctl = inet_ioctl, 919 .listen = inet_listen, 920 .shutdown = inet_shutdown, 921 .setsockopt = sock_common_setsockopt, 922 .getsockopt = sock_common_getsockopt, 923 .sendmsg = inet_sendmsg, 924 .recvmsg = inet_recvmsg, 925 .mmap = sock_no_mmap, 926 .sendpage = inet_sendpage, 927 .splice_read = tcp_splice_read, 928 #ifdef CONFIG_COMPAT 929 .compat_setsockopt = compat_sock_common_setsockopt, 930 .compat_getsockopt = compat_sock_common_getsockopt, 931 .compat_ioctl = inet_compat_ioctl, 932 #endif 933 }; 934 EXPORT_SYMBOL(inet_stream_ops); 935 936 const struct proto_ops inet_dgram_ops = { 937 .family = PF_INET, 938 .owner = THIS_MODULE, 939 .release = inet_release, 940 .bind = inet_bind, 941 .connect = inet_dgram_connect, 942 .socketpair = sock_no_socketpair, 943 .accept = sock_no_accept, 944 .getname = inet_getname, 945 .poll = udp_poll, 946 .ioctl = inet_ioctl, 947 .listen = sock_no_listen, 948 .shutdown = inet_shutdown, 949 .setsockopt = sock_common_setsockopt, 950 .getsockopt = sock_common_getsockopt, 951 .sendmsg = inet_sendmsg, 952 .recvmsg = inet_recvmsg, 953 .mmap = sock_no_mmap, 954 .sendpage = inet_sendpage, 955 #ifdef CONFIG_COMPAT 956 .compat_setsockopt = compat_sock_common_setsockopt, 957 .compat_getsockopt = compat_sock_common_getsockopt, 958 .compat_ioctl = inet_compat_ioctl, 959 #endif 960 }; 961 EXPORT_SYMBOL(inet_dgram_ops); 962 963 /* 964 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 965 * udp_poll 966 */ 967 static const struct proto_ops inet_sockraw_ops = { 968 .family = PF_INET, 969 .owner = THIS_MODULE, 970 .release = inet_release, 971 .bind = inet_bind, 972 .connect = inet_dgram_connect, 973 .socketpair = sock_no_socketpair, 974 .accept = sock_no_accept, 975 .getname = inet_getname, 976 .poll = datagram_poll, 977 .ioctl = inet_ioctl, 978 .listen = sock_no_listen, 979 .shutdown = inet_shutdown, 980 .setsockopt = sock_common_setsockopt, 981 .getsockopt = sock_common_getsockopt, 982 .sendmsg = inet_sendmsg, 983 .recvmsg = inet_recvmsg, 984 .mmap = sock_no_mmap, 985 .sendpage = inet_sendpage, 986 #ifdef CONFIG_COMPAT 987 .compat_setsockopt = compat_sock_common_setsockopt, 988 .compat_getsockopt = compat_sock_common_getsockopt, 989 .compat_ioctl = inet_compat_ioctl, 990 #endif 991 }; 992 993 static const struct net_proto_family inet_family_ops = { 994 .family = PF_INET, 995 .create = inet_create, 996 .owner = THIS_MODULE, 997 }; 998 999 /* Upon startup we insert all the elements in inetsw_array[] into 1000 * the linked list inetsw. 1001 */ 1002 static struct inet_protosw inetsw_array[] = 1003 { 1004 { 1005 .type = SOCK_STREAM, 1006 .protocol = IPPROTO_TCP, 1007 .prot = &tcp_prot, 1008 .ops = &inet_stream_ops, 1009 .no_check = 0, 1010 .flags = INET_PROTOSW_PERMANENT | 1011 INET_PROTOSW_ICSK, 1012 }, 1013 1014 { 1015 .type = SOCK_DGRAM, 1016 .protocol = IPPROTO_UDP, 1017 .prot = &udp_prot, 1018 .ops = &inet_dgram_ops, 1019 .no_check = UDP_CSUM_DEFAULT, 1020 .flags = INET_PROTOSW_PERMANENT, 1021 }, 1022 1023 { 1024 .type = SOCK_DGRAM, 1025 .protocol = IPPROTO_ICMP, 1026 .prot = &ping_prot, 1027 .ops = &inet_dgram_ops, 1028 .no_check = UDP_CSUM_DEFAULT, 1029 .flags = INET_PROTOSW_REUSE, 1030 }, 1031 1032 { 1033 .type = SOCK_RAW, 1034 .protocol = IPPROTO_IP, /* wild card */ 1035 .prot = &raw_prot, 1036 .ops = &inet_sockraw_ops, 1037 .no_check = UDP_CSUM_DEFAULT, 1038 .flags = INET_PROTOSW_REUSE, 1039 } 1040 }; 1041 1042 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) 1043 1044 void inet_register_protosw(struct inet_protosw *p) 1045 { 1046 struct list_head *lh; 1047 struct inet_protosw *answer; 1048 int protocol = p->protocol; 1049 struct list_head *last_perm; 1050 1051 spin_lock_bh(&inetsw_lock); 1052 1053 if (p->type >= SOCK_MAX) 1054 goto out_illegal; 1055 1056 /* If we are trying to override a permanent protocol, bail. */ 1057 answer = NULL; 1058 last_perm = &inetsw[p->type]; 1059 list_for_each(lh, &inetsw[p->type]) { 1060 answer = list_entry(lh, struct inet_protosw, list); 1061 1062 /* Check only the non-wild match. */ 1063 if (INET_PROTOSW_PERMANENT & answer->flags) { 1064 if (protocol == answer->protocol) 1065 break; 1066 last_perm = lh; 1067 } 1068 1069 answer = NULL; 1070 } 1071 if (answer) 1072 goto out_permanent; 1073 1074 /* Add the new entry after the last permanent entry if any, so that 1075 * the new entry does not override a permanent entry when matched with 1076 * a wild-card protocol. But it is allowed to override any existing 1077 * non-permanent entry. This means that when we remove this entry, the 1078 * system automatically returns to the old behavior. 1079 */ 1080 list_add_rcu(&p->list, last_perm); 1081 out: 1082 spin_unlock_bh(&inetsw_lock); 1083 1084 return; 1085 1086 out_permanent: 1087 printk(KERN_ERR "Attempt to override permanent protocol %d.\n", 1088 protocol); 1089 goto out; 1090 1091 out_illegal: 1092 printk(KERN_ERR 1093 "Ignoring attempt to register invalid socket type %d.\n", 1094 p->type); 1095 goto out; 1096 } 1097 EXPORT_SYMBOL(inet_register_protosw); 1098 1099 void inet_unregister_protosw(struct inet_protosw *p) 1100 { 1101 if (INET_PROTOSW_PERMANENT & p->flags) { 1102 printk(KERN_ERR 1103 "Attempt to unregister permanent protocol %d.\n", 1104 p->protocol); 1105 } else { 1106 spin_lock_bh(&inetsw_lock); 1107 list_del_rcu(&p->list); 1108 spin_unlock_bh(&inetsw_lock); 1109 1110 synchronize_net(); 1111 } 1112 } 1113 EXPORT_SYMBOL(inet_unregister_protosw); 1114 1115 /* 1116 * Shall we try to damage output packets if routing dev changes? 1117 */ 1118 1119 int sysctl_ip_dynaddr __read_mostly; 1120 1121 static int inet_sk_reselect_saddr(struct sock *sk) 1122 { 1123 struct inet_sock *inet = inet_sk(sk); 1124 __be32 old_saddr = inet->inet_saddr; 1125 __be32 daddr = inet->inet_daddr; 1126 struct flowi4 *fl4; 1127 struct rtable *rt; 1128 __be32 new_saddr; 1129 struct ip_options_rcu *inet_opt; 1130 1131 inet_opt = rcu_dereference_protected(inet->inet_opt, 1132 sock_owned_by_user(sk)); 1133 if (inet_opt && inet_opt->opt.srr) 1134 daddr = inet_opt->opt.faddr; 1135 1136 /* Query new route. */ 1137 fl4 = &inet->cork.fl.u.ip4; 1138 rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk), 1139 sk->sk_bound_dev_if, sk->sk_protocol, 1140 inet->inet_sport, inet->inet_dport, sk, false); 1141 if (IS_ERR(rt)) 1142 return PTR_ERR(rt); 1143 1144 sk_setup_caps(sk, &rt->dst); 1145 1146 new_saddr = fl4->saddr; 1147 1148 if (new_saddr == old_saddr) 1149 return 0; 1150 1151 if (sysctl_ip_dynaddr > 1) { 1152 printk(KERN_INFO "%s(): shifting inet->saddr from %pI4 to %pI4\n", 1153 __func__, &old_saddr, &new_saddr); 1154 } 1155 1156 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr; 1157 1158 /* 1159 * XXX The only one ugly spot where we need to 1160 * XXX really change the sockets identity after 1161 * XXX it has entered the hashes. -DaveM 1162 * 1163 * Besides that, it does not check for connection 1164 * uniqueness. Wait for troubles. 1165 */ 1166 __sk_prot_rehash(sk); 1167 return 0; 1168 } 1169 1170 int inet_sk_rebuild_header(struct sock *sk) 1171 { 1172 struct inet_sock *inet = inet_sk(sk); 1173 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); 1174 __be32 daddr; 1175 struct ip_options_rcu *inet_opt; 1176 struct flowi4 *fl4; 1177 int err; 1178 1179 /* Route is OK, nothing to do. */ 1180 if (rt) 1181 return 0; 1182 1183 /* Reroute. */ 1184 rcu_read_lock(); 1185 inet_opt = rcu_dereference(inet->inet_opt); 1186 daddr = inet->inet_daddr; 1187 if (inet_opt && inet_opt->opt.srr) 1188 daddr = inet_opt->opt.faddr; 1189 rcu_read_unlock(); 1190 fl4 = &inet->cork.fl.u.ip4; 1191 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr, 1192 inet->inet_dport, inet->inet_sport, 1193 sk->sk_protocol, RT_CONN_FLAGS(sk), 1194 sk->sk_bound_dev_if); 1195 if (!IS_ERR(rt)) { 1196 err = 0; 1197 sk_setup_caps(sk, &rt->dst); 1198 } else { 1199 err = PTR_ERR(rt); 1200 1201 /* Routing failed... */ 1202 sk->sk_route_caps = 0; 1203 /* 1204 * Other protocols have to map its equivalent state to TCP_SYN_SENT. 1205 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme 1206 */ 1207 if (!sysctl_ip_dynaddr || 1208 sk->sk_state != TCP_SYN_SENT || 1209 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 1210 (err = inet_sk_reselect_saddr(sk)) != 0) 1211 sk->sk_err_soft = -err; 1212 } 1213 1214 return err; 1215 } 1216 EXPORT_SYMBOL(inet_sk_rebuild_header); 1217 1218 static int inet_gso_send_check(struct sk_buff *skb) 1219 { 1220 const struct iphdr *iph; 1221 const struct net_protocol *ops; 1222 int proto; 1223 int ihl; 1224 int err = -EINVAL; 1225 1226 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1227 goto out; 1228 1229 iph = ip_hdr(skb); 1230 ihl = iph->ihl * 4; 1231 if (ihl < sizeof(*iph)) 1232 goto out; 1233 1234 if (unlikely(!pskb_may_pull(skb, ihl))) 1235 goto out; 1236 1237 __skb_pull(skb, ihl); 1238 skb_reset_transport_header(skb); 1239 iph = ip_hdr(skb); 1240 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1241 err = -EPROTONOSUPPORT; 1242 1243 rcu_read_lock(); 1244 ops = rcu_dereference(inet_protos[proto]); 1245 if (likely(ops && ops->gso_send_check)) 1246 err = ops->gso_send_check(skb); 1247 rcu_read_unlock(); 1248 1249 out: 1250 return err; 1251 } 1252 1253 static struct sk_buff *inet_gso_segment(struct sk_buff *skb, 1254 netdev_features_t features) 1255 { 1256 struct sk_buff *segs = ERR_PTR(-EINVAL); 1257 struct iphdr *iph; 1258 const struct net_protocol *ops; 1259 int proto; 1260 int ihl; 1261 int id; 1262 unsigned int offset = 0; 1263 1264 if (!(features & NETIF_F_V4_CSUM)) 1265 features &= ~NETIF_F_SG; 1266 1267 if (unlikely(skb_shinfo(skb)->gso_type & 1268 ~(SKB_GSO_TCPV4 | 1269 SKB_GSO_UDP | 1270 SKB_GSO_DODGY | 1271 SKB_GSO_TCP_ECN | 1272 0))) 1273 goto out; 1274 1275 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1276 goto out; 1277 1278 iph = ip_hdr(skb); 1279 ihl = iph->ihl * 4; 1280 if (ihl < sizeof(*iph)) 1281 goto out; 1282 1283 if (unlikely(!pskb_may_pull(skb, ihl))) 1284 goto out; 1285 1286 __skb_pull(skb, ihl); 1287 skb_reset_transport_header(skb); 1288 iph = ip_hdr(skb); 1289 id = ntohs(iph->id); 1290 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1291 segs = ERR_PTR(-EPROTONOSUPPORT); 1292 1293 rcu_read_lock(); 1294 ops = rcu_dereference(inet_protos[proto]); 1295 if (likely(ops && ops->gso_segment)) 1296 segs = ops->gso_segment(skb, features); 1297 rcu_read_unlock(); 1298 1299 if (!segs || IS_ERR(segs)) 1300 goto out; 1301 1302 skb = segs; 1303 do { 1304 iph = ip_hdr(skb); 1305 if (proto == IPPROTO_UDP) { 1306 iph->id = htons(id); 1307 iph->frag_off = htons(offset >> 3); 1308 if (skb->next != NULL) 1309 iph->frag_off |= htons(IP_MF); 1310 offset += (skb->len - skb->mac_len - iph->ihl * 4); 1311 } else 1312 iph->id = htons(id++); 1313 iph->tot_len = htons(skb->len - skb->mac_len); 1314 iph->check = 0; 1315 iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl); 1316 } while ((skb = skb->next)); 1317 1318 out: 1319 return segs; 1320 } 1321 1322 static struct sk_buff **inet_gro_receive(struct sk_buff **head, 1323 struct sk_buff *skb) 1324 { 1325 const struct net_protocol *ops; 1326 struct sk_buff **pp = NULL; 1327 struct sk_buff *p; 1328 const struct iphdr *iph; 1329 unsigned int hlen; 1330 unsigned int off; 1331 unsigned int id; 1332 int flush = 1; 1333 int proto; 1334 1335 off = skb_gro_offset(skb); 1336 hlen = off + sizeof(*iph); 1337 iph = skb_gro_header_fast(skb, off); 1338 if (skb_gro_header_hard(skb, hlen)) { 1339 iph = skb_gro_header_slow(skb, hlen, off); 1340 if (unlikely(!iph)) 1341 goto out; 1342 } 1343 1344 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1345 1346 rcu_read_lock(); 1347 ops = rcu_dereference(inet_protos[proto]); 1348 if (!ops || !ops->gro_receive) 1349 goto out_unlock; 1350 1351 if (*(u8 *)iph != 0x45) 1352 goto out_unlock; 1353 1354 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) 1355 goto out_unlock; 1356 1357 id = ntohl(*(__be32 *)&iph->id); 1358 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id ^ IP_DF)); 1359 id >>= 16; 1360 1361 for (p = *head; p; p = p->next) { 1362 struct iphdr *iph2; 1363 1364 if (!NAPI_GRO_CB(p)->same_flow) 1365 continue; 1366 1367 iph2 = ip_hdr(p); 1368 1369 if ((iph->protocol ^ iph2->protocol) | 1370 (iph->tos ^ iph2->tos) | 1371 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) | 1372 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) { 1373 NAPI_GRO_CB(p)->same_flow = 0; 1374 continue; 1375 } 1376 1377 /* All fields must match except length and checksum. */ 1378 NAPI_GRO_CB(p)->flush |= 1379 (iph->ttl ^ iph2->ttl) | 1380 ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id); 1381 1382 NAPI_GRO_CB(p)->flush |= flush; 1383 } 1384 1385 NAPI_GRO_CB(skb)->flush |= flush; 1386 skb_gro_pull(skb, sizeof(*iph)); 1387 skb_set_transport_header(skb, skb_gro_offset(skb)); 1388 1389 pp = ops->gro_receive(head, skb); 1390 1391 out_unlock: 1392 rcu_read_unlock(); 1393 1394 out: 1395 NAPI_GRO_CB(skb)->flush |= flush; 1396 1397 return pp; 1398 } 1399 1400 static int inet_gro_complete(struct sk_buff *skb) 1401 { 1402 const struct net_protocol *ops; 1403 struct iphdr *iph = ip_hdr(skb); 1404 int proto = iph->protocol & (MAX_INET_PROTOS - 1); 1405 int err = -ENOSYS; 1406 __be16 newlen = htons(skb->len - skb_network_offset(skb)); 1407 1408 csum_replace2(&iph->check, iph->tot_len, newlen); 1409 iph->tot_len = newlen; 1410 1411 rcu_read_lock(); 1412 ops = rcu_dereference(inet_protos[proto]); 1413 if (WARN_ON(!ops || !ops->gro_complete)) 1414 goto out_unlock; 1415 1416 err = ops->gro_complete(skb); 1417 1418 out_unlock: 1419 rcu_read_unlock(); 1420 1421 return err; 1422 } 1423 1424 int inet_ctl_sock_create(struct sock **sk, unsigned short family, 1425 unsigned short type, unsigned char protocol, 1426 struct net *net) 1427 { 1428 struct socket *sock; 1429 int rc = sock_create_kern(family, type, protocol, &sock); 1430 1431 if (rc == 0) { 1432 *sk = sock->sk; 1433 (*sk)->sk_allocation = GFP_ATOMIC; 1434 /* 1435 * Unhash it so that IP input processing does not even see it, 1436 * we do not wish this socket to see incoming packets. 1437 */ 1438 (*sk)->sk_prot->unhash(*sk); 1439 1440 sk_change_net(*sk, net); 1441 } 1442 return rc; 1443 } 1444 EXPORT_SYMBOL_GPL(inet_ctl_sock_create); 1445 1446 unsigned long snmp_fold_field(void __percpu *mib[], int offt) 1447 { 1448 unsigned long res = 0; 1449 int i, j; 1450 1451 for_each_possible_cpu(i) { 1452 for (j = 0; j < SNMP_ARRAY_SZ; j++) 1453 res += *(((unsigned long *) per_cpu_ptr(mib[j], i)) + offt); 1454 } 1455 return res; 1456 } 1457 EXPORT_SYMBOL_GPL(snmp_fold_field); 1458 1459 #if BITS_PER_LONG==32 1460 1461 u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t syncp_offset) 1462 { 1463 u64 res = 0; 1464 int cpu; 1465 1466 for_each_possible_cpu(cpu) { 1467 void *bhptr; 1468 struct u64_stats_sync *syncp; 1469 u64 v; 1470 unsigned int start; 1471 1472 bhptr = per_cpu_ptr(mib[0], cpu); 1473 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset); 1474 do { 1475 start = u64_stats_fetch_begin_bh(syncp); 1476 v = *(((u64 *) bhptr) + offt); 1477 } while (u64_stats_fetch_retry_bh(syncp, start)); 1478 1479 res += v; 1480 } 1481 return res; 1482 } 1483 EXPORT_SYMBOL_GPL(snmp_fold_field64); 1484 #endif 1485 1486 int snmp_mib_init(void __percpu *ptr[2], size_t mibsize, size_t align) 1487 { 1488 BUG_ON(ptr == NULL); 1489 ptr[0] = __alloc_percpu(mibsize, align); 1490 if (!ptr[0]) 1491 return -ENOMEM; 1492 #if SNMP_ARRAY_SZ == 2 1493 ptr[1] = __alloc_percpu(mibsize, align); 1494 if (!ptr[1]) { 1495 free_percpu(ptr[0]); 1496 ptr[0] = NULL; 1497 return -ENOMEM; 1498 } 1499 #endif 1500 return 0; 1501 } 1502 EXPORT_SYMBOL_GPL(snmp_mib_init); 1503 1504 void snmp_mib_free(void __percpu *ptr[SNMP_ARRAY_SZ]) 1505 { 1506 int i; 1507 1508 BUG_ON(ptr == NULL); 1509 for (i = 0; i < SNMP_ARRAY_SZ; i++) { 1510 free_percpu(ptr[i]); 1511 ptr[i] = NULL; 1512 } 1513 } 1514 EXPORT_SYMBOL_GPL(snmp_mib_free); 1515 1516 #ifdef CONFIG_IP_MULTICAST 1517 static const struct net_protocol igmp_protocol = { 1518 .handler = igmp_rcv, 1519 .netns_ok = 1, 1520 }; 1521 #endif 1522 1523 static const struct net_protocol tcp_protocol = { 1524 .handler = tcp_v4_rcv, 1525 .err_handler = tcp_v4_err, 1526 .gso_send_check = tcp_v4_gso_send_check, 1527 .gso_segment = tcp_tso_segment, 1528 .gro_receive = tcp4_gro_receive, 1529 .gro_complete = tcp4_gro_complete, 1530 .no_policy = 1, 1531 .netns_ok = 1, 1532 }; 1533 1534 static const struct net_protocol udp_protocol = { 1535 .handler = udp_rcv, 1536 .err_handler = udp_err, 1537 .gso_send_check = udp4_ufo_send_check, 1538 .gso_segment = udp4_ufo_fragment, 1539 .no_policy = 1, 1540 .netns_ok = 1, 1541 }; 1542 1543 static const struct net_protocol icmp_protocol = { 1544 .handler = icmp_rcv, 1545 .err_handler = ping_err, 1546 .no_policy = 1, 1547 .netns_ok = 1, 1548 }; 1549 1550 static __net_init int ipv4_mib_init_net(struct net *net) 1551 { 1552 if (snmp_mib_init((void __percpu **)net->mib.tcp_statistics, 1553 sizeof(struct tcp_mib), 1554 __alignof__(struct tcp_mib)) < 0) 1555 goto err_tcp_mib; 1556 if (snmp_mib_init((void __percpu **)net->mib.ip_statistics, 1557 sizeof(struct ipstats_mib), 1558 __alignof__(struct ipstats_mib)) < 0) 1559 goto err_ip_mib; 1560 if (snmp_mib_init((void __percpu **)net->mib.net_statistics, 1561 sizeof(struct linux_mib), 1562 __alignof__(struct linux_mib)) < 0) 1563 goto err_net_mib; 1564 if (snmp_mib_init((void __percpu **)net->mib.udp_statistics, 1565 sizeof(struct udp_mib), 1566 __alignof__(struct udp_mib)) < 0) 1567 goto err_udp_mib; 1568 if (snmp_mib_init((void __percpu **)net->mib.udplite_statistics, 1569 sizeof(struct udp_mib), 1570 __alignof__(struct udp_mib)) < 0) 1571 goto err_udplite_mib; 1572 if (snmp_mib_init((void __percpu **)net->mib.icmp_statistics, 1573 sizeof(struct icmp_mib), 1574 __alignof__(struct icmp_mib)) < 0) 1575 goto err_icmp_mib; 1576 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib), 1577 GFP_KERNEL); 1578 if (!net->mib.icmpmsg_statistics) 1579 goto err_icmpmsg_mib; 1580 1581 tcp_mib_init(net); 1582 return 0; 1583 1584 err_icmpmsg_mib: 1585 snmp_mib_free((void __percpu **)net->mib.icmp_statistics); 1586 err_icmp_mib: 1587 snmp_mib_free((void __percpu **)net->mib.udplite_statistics); 1588 err_udplite_mib: 1589 snmp_mib_free((void __percpu **)net->mib.udp_statistics); 1590 err_udp_mib: 1591 snmp_mib_free((void __percpu **)net->mib.net_statistics); 1592 err_net_mib: 1593 snmp_mib_free((void __percpu **)net->mib.ip_statistics); 1594 err_ip_mib: 1595 snmp_mib_free((void __percpu **)net->mib.tcp_statistics); 1596 err_tcp_mib: 1597 return -ENOMEM; 1598 } 1599 1600 static __net_exit void ipv4_mib_exit_net(struct net *net) 1601 { 1602 kfree(net->mib.icmpmsg_statistics); 1603 snmp_mib_free((void __percpu **)net->mib.icmp_statistics); 1604 snmp_mib_free((void __percpu **)net->mib.udplite_statistics); 1605 snmp_mib_free((void __percpu **)net->mib.udp_statistics); 1606 snmp_mib_free((void __percpu **)net->mib.net_statistics); 1607 snmp_mib_free((void __percpu **)net->mib.ip_statistics); 1608 snmp_mib_free((void __percpu **)net->mib.tcp_statistics); 1609 } 1610 1611 static __net_initdata struct pernet_operations ipv4_mib_ops = { 1612 .init = ipv4_mib_init_net, 1613 .exit = ipv4_mib_exit_net, 1614 }; 1615 1616 static int __init init_ipv4_mibs(void) 1617 { 1618 return register_pernet_subsys(&ipv4_mib_ops); 1619 } 1620 1621 static int ipv4_proc_init(void); 1622 1623 /* 1624 * IP protocol layer initialiser 1625 */ 1626 1627 static struct packet_type ip_packet_type __read_mostly = { 1628 .type = cpu_to_be16(ETH_P_IP), 1629 .func = ip_rcv, 1630 .gso_send_check = inet_gso_send_check, 1631 .gso_segment = inet_gso_segment, 1632 .gro_receive = inet_gro_receive, 1633 .gro_complete = inet_gro_complete, 1634 }; 1635 1636 static int __init inet_init(void) 1637 { 1638 struct sk_buff *dummy_skb; 1639 struct inet_protosw *q; 1640 struct list_head *r; 1641 int rc = -EINVAL; 1642 1643 BUILD_BUG_ON(sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb)); 1644 1645 sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL); 1646 if (!sysctl_local_reserved_ports) 1647 goto out; 1648 1649 rc = proto_register(&tcp_prot, 1); 1650 if (rc) 1651 goto out_free_reserved_ports; 1652 1653 rc = proto_register(&udp_prot, 1); 1654 if (rc) 1655 goto out_unregister_tcp_proto; 1656 1657 rc = proto_register(&raw_prot, 1); 1658 if (rc) 1659 goto out_unregister_udp_proto; 1660 1661 rc = proto_register(&ping_prot, 1); 1662 if (rc) 1663 goto out_unregister_raw_proto; 1664 1665 /* 1666 * Tell SOCKET that we are alive... 1667 */ 1668 1669 (void)sock_register(&inet_family_ops); 1670 1671 #ifdef CONFIG_SYSCTL 1672 ip_static_sysctl_init(); 1673 #endif 1674 1675 tcp_prot.sysctl_mem = init_net.ipv4.sysctl_tcp_mem; 1676 1677 /* 1678 * Add all the base protocols. 1679 */ 1680 1681 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 1682 printk(KERN_CRIT "inet_init: Cannot add ICMP protocol\n"); 1683 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) 1684 printk(KERN_CRIT "inet_init: Cannot add UDP protocol\n"); 1685 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) 1686 printk(KERN_CRIT "inet_init: Cannot add TCP protocol\n"); 1687 #ifdef CONFIG_IP_MULTICAST 1688 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 1689 printk(KERN_CRIT "inet_init: Cannot add IGMP protocol\n"); 1690 #endif 1691 1692 /* Register the socket-side information for inet_create. */ 1693 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 1694 INIT_LIST_HEAD(r); 1695 1696 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 1697 inet_register_protosw(q); 1698 1699 /* 1700 * Set the ARP module up 1701 */ 1702 1703 arp_init(); 1704 1705 /* 1706 * Set the IP module up 1707 */ 1708 1709 ip_init(); 1710 1711 tcp_v4_init(); 1712 1713 /* Setup TCP slab cache for open requests. */ 1714 tcp_init(); 1715 1716 /* Setup UDP memory threshold */ 1717 udp_init(); 1718 1719 /* Add UDP-Lite (RFC 3828) */ 1720 udplite4_register(); 1721 1722 ping_init(); 1723 1724 /* 1725 * Set the ICMP layer up 1726 */ 1727 1728 if (icmp_init() < 0) 1729 panic("Failed to create the ICMP control socket.\n"); 1730 1731 /* 1732 * Initialise the multicast router 1733 */ 1734 #if defined(CONFIG_IP_MROUTE) 1735 if (ip_mr_init()) 1736 printk(KERN_CRIT "inet_init: Cannot init ipv4 mroute\n"); 1737 #endif 1738 /* 1739 * Initialise per-cpu ipv4 mibs 1740 */ 1741 1742 if (init_ipv4_mibs()) 1743 printk(KERN_CRIT "inet_init: Cannot init ipv4 mibs\n"); 1744 1745 ipv4_proc_init(); 1746 1747 ipfrag_init(); 1748 1749 dev_add_pack(&ip_packet_type); 1750 1751 rc = 0; 1752 out: 1753 return rc; 1754 out_unregister_raw_proto: 1755 proto_unregister(&raw_prot); 1756 out_unregister_udp_proto: 1757 proto_unregister(&udp_prot); 1758 out_unregister_tcp_proto: 1759 proto_unregister(&tcp_prot); 1760 out_free_reserved_ports: 1761 kfree(sysctl_local_reserved_ports); 1762 goto out; 1763 } 1764 1765 fs_initcall(inet_init); 1766 1767 /* ------------------------------------------------------------------------ */ 1768 1769 #ifdef CONFIG_PROC_FS 1770 static int __init ipv4_proc_init(void) 1771 { 1772 int rc = 0; 1773 1774 if (raw_proc_init()) 1775 goto out_raw; 1776 if (tcp4_proc_init()) 1777 goto out_tcp; 1778 if (udp4_proc_init()) 1779 goto out_udp; 1780 if (ping_proc_init()) 1781 goto out_ping; 1782 if (ip_misc_proc_init()) 1783 goto out_misc; 1784 out: 1785 return rc; 1786 out_misc: 1787 ping_proc_exit(); 1788 out_ping: 1789 udp4_proc_exit(); 1790 out_udp: 1791 tcp4_proc_exit(); 1792 out_tcp: 1793 raw_proc_exit(); 1794 out_raw: 1795 rc = -ENOMEM; 1796 goto out; 1797 } 1798 1799 #else /* CONFIG_PROC_FS */ 1800 static int __init ipv4_proc_init(void) 1801 { 1802 return 0; 1803 } 1804 #endif /* CONFIG_PROC_FS */ 1805 1806 MODULE_ALIAS_NETPROTO(PF_INET); 1807 1808