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 90 #include <asm/uaccess.h> 91 #include <asm/system.h> 92 93 #include <linux/inet.h> 94 #include <linux/igmp.h> 95 #include <linux/inetdevice.h> 96 #include <linux/netdevice.h> 97 #include <net/checksum.h> 98 #include <net/ip.h> 99 #include <net/protocol.h> 100 #include <net/arp.h> 101 #include <net/route.h> 102 #include <net/ip_fib.h> 103 #include <net/inet_connection_sock.h> 104 #include <net/tcp.h> 105 #include <net/udp.h> 106 #include <net/udplite.h> 107 #include <linux/skbuff.h> 108 #include <net/sock.h> 109 #include <net/raw.h> 110 #include <net/icmp.h> 111 #include <net/ipip.h> 112 #include <net/inet_common.h> 113 #include <net/xfrm.h> 114 #include <net/net_namespace.h> 115 #ifdef CONFIG_IP_MROUTE 116 #include <linux/mroute.h> 117 #endif 118 119 120 /* The inetsw table contains everything that inet_create needs to 121 * build a new socket. 122 */ 123 static struct list_head inetsw[SOCK_MAX]; 124 static DEFINE_SPINLOCK(inetsw_lock); 125 126 struct ipv4_config ipv4_config; 127 128 EXPORT_SYMBOL(ipv4_config); 129 130 /* New destruction routine */ 131 132 void inet_sock_destruct(struct sock *sk) 133 { 134 struct inet_sock *inet = inet_sk(sk); 135 136 __skb_queue_purge(&sk->sk_receive_queue); 137 __skb_queue_purge(&sk->sk_error_queue); 138 139 sk_mem_reclaim(sk); 140 141 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) { 142 printk("Attempt to release TCP socket in state %d %p\n", 143 sk->sk_state, sk); 144 return; 145 } 146 if (!sock_flag(sk, SOCK_DEAD)) { 147 printk("Attempt to release alive inet socket %p\n", sk); 148 return; 149 } 150 151 WARN_ON(atomic_read(&sk->sk_rmem_alloc)); 152 WARN_ON(atomic_read(&sk->sk_wmem_alloc)); 153 WARN_ON(sk->sk_wmem_queued); 154 WARN_ON(sk->sk_forward_alloc); 155 156 kfree(inet->opt); 157 dst_release(sk->sk_dst_cache); 158 sk_refcnt_debug_dec(sk); 159 } 160 161 /* 162 * The routines beyond this point handle the behaviour of an AF_INET 163 * socket object. Mostly it punts to the subprotocols of IP to do 164 * the work. 165 */ 166 167 /* 168 * Automatically bind an unbound socket. 169 */ 170 171 static int inet_autobind(struct sock *sk) 172 { 173 struct inet_sock *inet; 174 /* We may need to bind the socket. */ 175 lock_sock(sk); 176 inet = inet_sk(sk); 177 if (!inet->num) { 178 if (sk->sk_prot->get_port(sk, 0)) { 179 release_sock(sk); 180 return -EAGAIN; 181 } 182 inet->sport = htons(inet->num); 183 } 184 release_sock(sk); 185 return 0; 186 } 187 188 /* 189 * Move a socket into listening state. 190 */ 191 int inet_listen(struct socket *sock, int backlog) 192 { 193 struct sock *sk = sock->sk; 194 unsigned char old_state; 195 int err; 196 197 lock_sock(sk); 198 199 err = -EINVAL; 200 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM) 201 goto out; 202 203 old_state = sk->sk_state; 204 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN))) 205 goto out; 206 207 /* Really, if the socket is already in listen state 208 * we can only allow the backlog to be adjusted. 209 */ 210 if (old_state != TCP_LISTEN) { 211 err = inet_csk_listen_start(sk, backlog); 212 if (err) 213 goto out; 214 } 215 sk->sk_max_ack_backlog = backlog; 216 err = 0; 217 218 out: 219 release_sock(sk); 220 return err; 221 } 222 223 u32 inet_ehash_secret __read_mostly; 224 EXPORT_SYMBOL(inet_ehash_secret); 225 226 /* 227 * inet_ehash_secret must be set exactly once 228 * Instead of using a dedicated spinlock, we (ab)use inetsw_lock 229 */ 230 void build_ehash_secret(void) 231 { 232 u32 rnd; 233 do { 234 get_random_bytes(&rnd, sizeof(rnd)); 235 } while (rnd == 0); 236 spin_lock_bh(&inetsw_lock); 237 if (!inet_ehash_secret) 238 inet_ehash_secret = rnd; 239 spin_unlock_bh(&inetsw_lock); 240 } 241 EXPORT_SYMBOL(build_ehash_secret); 242 243 static inline int inet_netns_ok(struct net *net, int protocol) 244 { 245 int hash; 246 struct net_protocol *ipprot; 247 248 if (net_eq(net, &init_net)) 249 return 1; 250 251 hash = protocol & (MAX_INET_PROTOS - 1); 252 ipprot = rcu_dereference(inet_protos[hash]); 253 254 if (ipprot == NULL) 255 /* raw IP is OK */ 256 return 1; 257 return ipprot->netns_ok; 258 } 259 260 /* 261 * Create an inet socket. 262 */ 263 264 static int inet_create(struct net *net, struct socket *sock, int protocol) 265 { 266 struct sock *sk; 267 struct inet_protosw *answer; 268 struct inet_sock *inet; 269 struct proto *answer_prot; 270 unsigned char answer_flags; 271 char answer_no_check; 272 int try_loading_module = 0; 273 int err; 274 275 if (unlikely(!inet_ehash_secret)) 276 if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM) 277 build_ehash_secret(); 278 279 sock->state = SS_UNCONNECTED; 280 281 /* Look for the requested type/protocol pair. */ 282 lookup_protocol: 283 err = -ESOCKTNOSUPPORT; 284 rcu_read_lock(); 285 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) { 286 287 err = 0; 288 /* Check the non-wild match. */ 289 if (protocol == answer->protocol) { 290 if (protocol != IPPROTO_IP) 291 break; 292 } else { 293 /* Check for the two wild cases. */ 294 if (IPPROTO_IP == protocol) { 295 protocol = answer->protocol; 296 break; 297 } 298 if (IPPROTO_IP == answer->protocol) 299 break; 300 } 301 err = -EPROTONOSUPPORT; 302 } 303 304 if (unlikely(err)) { 305 if (try_loading_module < 2) { 306 rcu_read_unlock(); 307 /* 308 * Be more specific, e.g. net-pf-2-proto-132-type-1 309 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) 310 */ 311 if (++try_loading_module == 1) 312 request_module("net-pf-%d-proto-%d-type-%d", 313 PF_INET, protocol, sock->type); 314 /* 315 * Fall back to generic, e.g. net-pf-2-proto-132 316 * (net-pf-PF_INET-proto-IPPROTO_SCTP) 317 */ 318 else 319 request_module("net-pf-%d-proto-%d", 320 PF_INET, protocol); 321 goto lookup_protocol; 322 } else 323 goto out_rcu_unlock; 324 } 325 326 err = -EPERM; 327 if (answer->capability > 0 && !capable(answer->capability)) 328 goto out_rcu_unlock; 329 330 err = -EAFNOSUPPORT; 331 if (!inet_netns_ok(net, protocol)) 332 goto out_rcu_unlock; 333 334 sock->ops = answer->ops; 335 answer_prot = answer->prot; 336 answer_no_check = answer->no_check; 337 answer_flags = answer->flags; 338 rcu_read_unlock(); 339 340 WARN_ON(answer_prot->slab == NULL); 341 342 err = -ENOBUFS; 343 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot); 344 if (sk == NULL) 345 goto out; 346 347 err = 0; 348 sk->sk_no_check = answer_no_check; 349 if (INET_PROTOSW_REUSE & answer_flags) 350 sk->sk_reuse = 1; 351 352 inet = inet_sk(sk); 353 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 354 355 if (SOCK_RAW == sock->type) { 356 inet->num = protocol; 357 if (IPPROTO_RAW == protocol) 358 inet->hdrincl = 1; 359 } 360 361 if (ipv4_config.no_pmtu_disc) 362 inet->pmtudisc = IP_PMTUDISC_DONT; 363 else 364 inet->pmtudisc = IP_PMTUDISC_WANT; 365 366 inet->id = 0; 367 368 sock_init_data(sock, sk); 369 370 sk->sk_destruct = inet_sock_destruct; 371 sk->sk_protocol = protocol; 372 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 373 374 inet->uc_ttl = -1; 375 inet->mc_loop = 1; 376 inet->mc_ttl = 1; 377 inet->mc_all = 1; 378 inet->mc_index = 0; 379 inet->mc_list = NULL; 380 381 sk_refcnt_debug_inc(sk); 382 383 if (inet->num) { 384 /* It assumes that any protocol which allows 385 * the user to assign a number at socket 386 * creation time automatically 387 * shares. 388 */ 389 inet->sport = htons(inet->num); 390 /* Add to protocol hash chains. */ 391 sk->sk_prot->hash(sk); 392 } 393 394 if (sk->sk_prot->init) { 395 err = sk->sk_prot->init(sk); 396 if (err) 397 sk_common_release(sk); 398 } 399 out: 400 return err; 401 out_rcu_unlock: 402 rcu_read_unlock(); 403 goto out; 404 } 405 406 407 /* 408 * The peer socket should always be NULL (or else). When we call this 409 * function we are destroying the object and from then on nobody 410 * should refer to it. 411 */ 412 int inet_release(struct socket *sock) 413 { 414 struct sock *sk = sock->sk; 415 416 if (sk) { 417 long timeout; 418 419 /* Applications forget to leave groups before exiting */ 420 ip_mc_drop_socket(sk); 421 422 /* If linger is set, we don't return until the close 423 * is complete. Otherwise we return immediately. The 424 * actually closing is done the same either way. 425 * 426 * If the close is due to the process exiting, we never 427 * linger.. 428 */ 429 timeout = 0; 430 if (sock_flag(sk, SOCK_LINGER) && 431 !(current->flags & PF_EXITING)) 432 timeout = sk->sk_lingertime; 433 sock->sk = NULL; 434 sk->sk_prot->close(sk, timeout); 435 } 436 return 0; 437 } 438 439 /* It is off by default, see below. */ 440 int sysctl_ip_nonlocal_bind __read_mostly; 441 442 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 443 { 444 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 445 struct sock *sk = sock->sk; 446 struct inet_sock *inet = inet_sk(sk); 447 unsigned short snum; 448 int chk_addr_ret; 449 int err; 450 451 /* If the socket has its own bind function then use it. (RAW) */ 452 if (sk->sk_prot->bind) { 453 err = sk->sk_prot->bind(sk, uaddr, addr_len); 454 goto out; 455 } 456 err = -EINVAL; 457 if (addr_len < sizeof(struct sockaddr_in)) 458 goto out; 459 460 chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr); 461 462 /* Not specified by any standard per-se, however it breaks too 463 * many applications when removed. It is unfortunate since 464 * allowing applications to make a non-local bind solves 465 * several problems with systems using dynamic addressing. 466 * (ie. your servers still start up even if your ISDN link 467 * is temporarily down) 468 */ 469 err = -EADDRNOTAVAIL; 470 if (!sysctl_ip_nonlocal_bind && 471 !(inet->freebind || inet->transparent) && 472 addr->sin_addr.s_addr != htonl(INADDR_ANY) && 473 chk_addr_ret != RTN_LOCAL && 474 chk_addr_ret != RTN_MULTICAST && 475 chk_addr_ret != RTN_BROADCAST) 476 goto out; 477 478 snum = ntohs(addr->sin_port); 479 err = -EACCES; 480 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) 481 goto out; 482 483 /* We keep a pair of addresses. rcv_saddr is the one 484 * used by hash lookups, and saddr is used for transmit. 485 * 486 * In the BSD API these are the same except where it 487 * would be illegal to use them (multicast/broadcast) in 488 * which case the sending device address is used. 489 */ 490 lock_sock(sk); 491 492 /* Check these errors (active socket, double bind). */ 493 err = -EINVAL; 494 if (sk->sk_state != TCP_CLOSE || inet->num) 495 goto out_release_sock; 496 497 inet->rcv_saddr = inet->saddr = addr->sin_addr.s_addr; 498 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 499 inet->saddr = 0; /* Use device */ 500 501 /* Make sure we are allowed to bind here. */ 502 if (sk->sk_prot->get_port(sk, snum)) { 503 inet->saddr = inet->rcv_saddr = 0; 504 err = -EADDRINUSE; 505 goto out_release_sock; 506 } 507 508 if (inet->rcv_saddr) 509 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 510 if (snum) 511 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 512 inet->sport = htons(inet->num); 513 inet->daddr = 0; 514 inet->dport = 0; 515 sk_dst_reset(sk); 516 err = 0; 517 out_release_sock: 518 release_sock(sk); 519 out: 520 return err; 521 } 522 523 int inet_dgram_connect(struct socket *sock, struct sockaddr * uaddr, 524 int addr_len, int flags) 525 { 526 struct sock *sk = sock->sk; 527 528 if (uaddr->sa_family == AF_UNSPEC) 529 return sk->sk_prot->disconnect(sk, flags); 530 531 if (!inet_sk(sk)->num && inet_autobind(sk)) 532 return -EAGAIN; 533 return sk->sk_prot->connect(sk, (struct sockaddr *)uaddr, addr_len); 534 } 535 536 static long inet_wait_for_connect(struct sock *sk, long timeo) 537 { 538 DEFINE_WAIT(wait); 539 540 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 541 542 /* Basic assumption: if someone sets sk->sk_err, he _must_ 543 * change state of the socket from TCP_SYN_*. 544 * Connect() does not allow to get error notifications 545 * without closing the socket. 546 */ 547 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 548 release_sock(sk); 549 timeo = schedule_timeout(timeo); 550 lock_sock(sk); 551 if (signal_pending(current) || !timeo) 552 break; 553 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 554 } 555 finish_wait(sk->sk_sleep, &wait); 556 return timeo; 557 } 558 559 /* 560 * Connect to a remote host. There is regrettably still a little 561 * TCP 'magic' in here. 562 */ 563 int 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 lock_sock(sk); 571 572 if (uaddr->sa_family == AF_UNSPEC) { 573 err = sk->sk_prot->disconnect(sk, flags); 574 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 575 goto out; 576 } 577 578 switch (sock->state) { 579 default: 580 err = -EINVAL; 581 goto out; 582 case SS_CONNECTED: 583 err = -EISCONN; 584 goto out; 585 case SS_CONNECTING: 586 err = -EALREADY; 587 /* Fall out of switch with err, set for this state */ 588 break; 589 case SS_UNCONNECTED: 590 err = -EISCONN; 591 if (sk->sk_state != TCP_CLOSE) 592 goto out; 593 594 err = sk->sk_prot->connect(sk, uaddr, addr_len); 595 if (err < 0) 596 goto out; 597 598 sock->state = SS_CONNECTING; 599 600 /* Just entered SS_CONNECTING state; the only 601 * difference is that return value in non-blocking 602 * case is EINPROGRESS, rather than EALREADY. 603 */ 604 err = -EINPROGRESS; 605 break; 606 } 607 608 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 609 610 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 611 /* Error code is set above */ 612 if (!timeo || !inet_wait_for_connect(sk, timeo)) 613 goto out; 614 615 err = sock_intr_errno(timeo); 616 if (signal_pending(current)) 617 goto out; 618 } 619 620 /* Connection was closed by RST, timeout, ICMP error 621 * or another process disconnected us. 622 */ 623 if (sk->sk_state == TCP_CLOSE) 624 goto sock_error; 625 626 /* sk->sk_err may be not zero now, if RECVERR was ordered by user 627 * and error was received after socket entered established state. 628 * Hence, it is handled normally after connect() return successfully. 629 */ 630 631 sock->state = SS_CONNECTED; 632 err = 0; 633 out: 634 release_sock(sk); 635 return err; 636 637 sock_error: 638 err = sock_error(sk) ? : -ECONNABORTED; 639 sock->state = SS_UNCONNECTED; 640 if (sk->sk_prot->disconnect(sk, flags)) 641 sock->state = SS_DISCONNECTING; 642 goto out; 643 } 644 645 /* 646 * Accept a pending connection. The TCP layer now gives BSD semantics. 647 */ 648 649 int inet_accept(struct socket *sock, struct socket *newsock, int flags) 650 { 651 struct sock *sk1 = sock->sk; 652 int err = -EINVAL; 653 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err); 654 655 if (!sk2) 656 goto do_err; 657 658 lock_sock(sk2); 659 660 WARN_ON(!((1 << sk2->sk_state) & 661 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE))); 662 663 sock_graft(sk2, newsock); 664 665 newsock->state = SS_CONNECTED; 666 err = 0; 667 release_sock(sk2); 668 do_err: 669 return err; 670 } 671 672 673 /* 674 * This does both peername and sockname. 675 */ 676 int inet_getname(struct socket *sock, struct sockaddr *uaddr, 677 int *uaddr_len, int peer) 678 { 679 struct sock *sk = sock->sk; 680 struct inet_sock *inet = inet_sk(sk); 681 struct sockaddr_in *sin = (struct sockaddr_in *)uaddr; 682 683 sin->sin_family = AF_INET; 684 if (peer) { 685 if (!inet->dport || 686 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 687 peer == 1)) 688 return -ENOTCONN; 689 sin->sin_port = inet->dport; 690 sin->sin_addr.s_addr = inet->daddr; 691 } else { 692 __be32 addr = inet->rcv_saddr; 693 if (!addr) 694 addr = inet->saddr; 695 sin->sin_port = inet->sport; 696 sin->sin_addr.s_addr = addr; 697 } 698 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 699 *uaddr_len = sizeof(*sin); 700 return 0; 701 } 702 703 int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 704 size_t size) 705 { 706 struct sock *sk = sock->sk; 707 708 /* We may need to bind the socket. */ 709 if (!inet_sk(sk)->num && inet_autobind(sk)) 710 return -EAGAIN; 711 712 return sk->sk_prot->sendmsg(iocb, sk, msg, size); 713 } 714 715 716 static ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) 717 { 718 struct sock *sk = sock->sk; 719 720 /* We may need to bind the socket. */ 721 if (!inet_sk(sk)->num && inet_autobind(sk)) 722 return -EAGAIN; 723 724 if (sk->sk_prot->sendpage) 725 return sk->sk_prot->sendpage(sk, page, offset, size, flags); 726 return sock_no_sendpage(sock, page, offset, size, flags); 727 } 728 729 730 int inet_shutdown(struct socket *sock, int how) 731 { 732 struct sock *sk = sock->sk; 733 int err = 0; 734 735 /* This should really check to make sure 736 * the socket is a TCP socket. (WHY AC...) 737 */ 738 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and 739 1->2 bit 2 snds. 740 2->3 */ 741 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ 742 return -EINVAL; 743 744 lock_sock(sk); 745 if (sock->state == SS_CONNECTING) { 746 if ((1 << sk->sk_state) & 747 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) 748 sock->state = SS_DISCONNECTING; 749 else 750 sock->state = SS_CONNECTED; 751 } 752 753 switch (sk->sk_state) { 754 case TCP_CLOSE: 755 err = -ENOTCONN; 756 /* Hack to wake up other listeners, who can poll for 757 POLLHUP, even on eg. unconnected UDP sockets -- RR */ 758 default: 759 sk->sk_shutdown |= how; 760 if (sk->sk_prot->shutdown) 761 sk->sk_prot->shutdown(sk, how); 762 break; 763 764 /* Remaining two branches are temporary solution for missing 765 * close() in multithreaded environment. It is _not_ a good idea, 766 * but we have no choice until close() is repaired at VFS level. 767 */ 768 case TCP_LISTEN: 769 if (!(how & RCV_SHUTDOWN)) 770 break; 771 /* Fall through */ 772 case TCP_SYN_SENT: 773 err = sk->sk_prot->disconnect(sk, O_NONBLOCK); 774 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 775 break; 776 } 777 778 /* Wake up anyone sleeping in poll. */ 779 sk->sk_state_change(sk); 780 release_sock(sk); 781 return err; 782 } 783 784 /* 785 * ioctl() calls you can issue on an INET socket. Most of these are 786 * device configuration and stuff and very rarely used. Some ioctls 787 * pass on to the socket itself. 788 * 789 * NOTE: I like the idea of a module for the config stuff. ie ifconfig 790 * loads the devconfigure module does its configuring and unloads it. 791 * There's a good 20K of config code hanging around the kernel. 792 */ 793 794 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 795 { 796 struct sock *sk = sock->sk; 797 int err = 0; 798 struct net *net = sock_net(sk); 799 800 switch (cmd) { 801 case SIOCGSTAMP: 802 err = sock_get_timestamp(sk, (struct timeval __user *)arg); 803 break; 804 case SIOCGSTAMPNS: 805 err = sock_get_timestampns(sk, (struct timespec __user *)arg); 806 break; 807 case SIOCADDRT: 808 case SIOCDELRT: 809 case SIOCRTMSG: 810 err = ip_rt_ioctl(net, cmd, (void __user *)arg); 811 break; 812 case SIOCDARP: 813 case SIOCGARP: 814 case SIOCSARP: 815 err = arp_ioctl(net, cmd, (void __user *)arg); 816 break; 817 case SIOCGIFADDR: 818 case SIOCSIFADDR: 819 case SIOCGIFBRDADDR: 820 case SIOCSIFBRDADDR: 821 case SIOCGIFNETMASK: 822 case SIOCSIFNETMASK: 823 case SIOCGIFDSTADDR: 824 case SIOCSIFDSTADDR: 825 case SIOCSIFPFLAGS: 826 case SIOCGIFPFLAGS: 827 case SIOCSIFFLAGS: 828 err = devinet_ioctl(net, cmd, (void __user *)arg); 829 break; 830 default: 831 if (sk->sk_prot->ioctl) 832 err = sk->sk_prot->ioctl(sk, cmd, arg); 833 else 834 err = -ENOIOCTLCMD; 835 break; 836 } 837 return err; 838 } 839 840 const struct proto_ops inet_stream_ops = { 841 .family = PF_INET, 842 .owner = THIS_MODULE, 843 .release = inet_release, 844 .bind = inet_bind, 845 .connect = inet_stream_connect, 846 .socketpair = sock_no_socketpair, 847 .accept = inet_accept, 848 .getname = inet_getname, 849 .poll = tcp_poll, 850 .ioctl = inet_ioctl, 851 .listen = inet_listen, 852 .shutdown = inet_shutdown, 853 .setsockopt = sock_common_setsockopt, 854 .getsockopt = sock_common_getsockopt, 855 .sendmsg = tcp_sendmsg, 856 .recvmsg = sock_common_recvmsg, 857 .mmap = sock_no_mmap, 858 .sendpage = tcp_sendpage, 859 .splice_read = tcp_splice_read, 860 #ifdef CONFIG_COMPAT 861 .compat_setsockopt = compat_sock_common_setsockopt, 862 .compat_getsockopt = compat_sock_common_getsockopt, 863 #endif 864 }; 865 866 const struct proto_ops inet_dgram_ops = { 867 .family = PF_INET, 868 .owner = THIS_MODULE, 869 .release = inet_release, 870 .bind = inet_bind, 871 .connect = inet_dgram_connect, 872 .socketpair = sock_no_socketpair, 873 .accept = sock_no_accept, 874 .getname = inet_getname, 875 .poll = udp_poll, 876 .ioctl = inet_ioctl, 877 .listen = sock_no_listen, 878 .shutdown = inet_shutdown, 879 .setsockopt = sock_common_setsockopt, 880 .getsockopt = sock_common_getsockopt, 881 .sendmsg = inet_sendmsg, 882 .recvmsg = sock_common_recvmsg, 883 .mmap = sock_no_mmap, 884 .sendpage = inet_sendpage, 885 #ifdef CONFIG_COMPAT 886 .compat_setsockopt = compat_sock_common_setsockopt, 887 .compat_getsockopt = compat_sock_common_getsockopt, 888 #endif 889 }; 890 891 /* 892 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 893 * udp_poll 894 */ 895 static const struct proto_ops inet_sockraw_ops = { 896 .family = PF_INET, 897 .owner = THIS_MODULE, 898 .release = inet_release, 899 .bind = inet_bind, 900 .connect = inet_dgram_connect, 901 .socketpair = sock_no_socketpair, 902 .accept = sock_no_accept, 903 .getname = inet_getname, 904 .poll = datagram_poll, 905 .ioctl = inet_ioctl, 906 .listen = sock_no_listen, 907 .shutdown = inet_shutdown, 908 .setsockopt = sock_common_setsockopt, 909 .getsockopt = sock_common_getsockopt, 910 .sendmsg = inet_sendmsg, 911 .recvmsg = sock_common_recvmsg, 912 .mmap = sock_no_mmap, 913 .sendpage = inet_sendpage, 914 #ifdef CONFIG_COMPAT 915 .compat_setsockopt = compat_sock_common_setsockopt, 916 .compat_getsockopt = compat_sock_common_getsockopt, 917 #endif 918 }; 919 920 static struct net_proto_family inet_family_ops = { 921 .family = PF_INET, 922 .create = inet_create, 923 .owner = THIS_MODULE, 924 }; 925 926 /* Upon startup we insert all the elements in inetsw_array[] into 927 * the linked list inetsw. 928 */ 929 static struct inet_protosw inetsw_array[] = 930 { 931 { 932 .type = SOCK_STREAM, 933 .protocol = IPPROTO_TCP, 934 .prot = &tcp_prot, 935 .ops = &inet_stream_ops, 936 .capability = -1, 937 .no_check = 0, 938 .flags = INET_PROTOSW_PERMANENT | 939 INET_PROTOSW_ICSK, 940 }, 941 942 { 943 .type = SOCK_DGRAM, 944 .protocol = IPPROTO_UDP, 945 .prot = &udp_prot, 946 .ops = &inet_dgram_ops, 947 .capability = -1, 948 .no_check = UDP_CSUM_DEFAULT, 949 .flags = INET_PROTOSW_PERMANENT, 950 }, 951 952 953 { 954 .type = SOCK_RAW, 955 .protocol = IPPROTO_IP, /* wild card */ 956 .prot = &raw_prot, 957 .ops = &inet_sockraw_ops, 958 .capability = CAP_NET_RAW, 959 .no_check = UDP_CSUM_DEFAULT, 960 .flags = INET_PROTOSW_REUSE, 961 } 962 }; 963 964 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) 965 966 void inet_register_protosw(struct inet_protosw *p) 967 { 968 struct list_head *lh; 969 struct inet_protosw *answer; 970 int protocol = p->protocol; 971 struct list_head *last_perm; 972 973 spin_lock_bh(&inetsw_lock); 974 975 if (p->type >= SOCK_MAX) 976 goto out_illegal; 977 978 /* If we are trying to override a permanent protocol, bail. */ 979 answer = NULL; 980 last_perm = &inetsw[p->type]; 981 list_for_each(lh, &inetsw[p->type]) { 982 answer = list_entry(lh, struct inet_protosw, list); 983 984 /* Check only the non-wild match. */ 985 if (INET_PROTOSW_PERMANENT & answer->flags) { 986 if (protocol == answer->protocol) 987 break; 988 last_perm = lh; 989 } 990 991 answer = NULL; 992 } 993 if (answer) 994 goto out_permanent; 995 996 /* Add the new entry after the last permanent entry if any, so that 997 * the new entry does not override a permanent entry when matched with 998 * a wild-card protocol. But it is allowed to override any existing 999 * non-permanent entry. This means that when we remove this entry, the 1000 * system automatically returns to the old behavior. 1001 */ 1002 list_add_rcu(&p->list, last_perm); 1003 out: 1004 spin_unlock_bh(&inetsw_lock); 1005 1006 return; 1007 1008 out_permanent: 1009 printk(KERN_ERR "Attempt to override permanent protocol %d.\n", 1010 protocol); 1011 goto out; 1012 1013 out_illegal: 1014 printk(KERN_ERR 1015 "Ignoring attempt to register invalid socket type %d.\n", 1016 p->type); 1017 goto out; 1018 } 1019 1020 void inet_unregister_protosw(struct inet_protosw *p) 1021 { 1022 if (INET_PROTOSW_PERMANENT & p->flags) { 1023 printk(KERN_ERR 1024 "Attempt to unregister permanent protocol %d.\n", 1025 p->protocol); 1026 } else { 1027 spin_lock_bh(&inetsw_lock); 1028 list_del_rcu(&p->list); 1029 spin_unlock_bh(&inetsw_lock); 1030 1031 synchronize_net(); 1032 } 1033 } 1034 1035 /* 1036 * Shall we try to damage output packets if routing dev changes? 1037 */ 1038 1039 int sysctl_ip_dynaddr __read_mostly; 1040 1041 static int inet_sk_reselect_saddr(struct sock *sk) 1042 { 1043 struct inet_sock *inet = inet_sk(sk); 1044 int err; 1045 struct rtable *rt; 1046 __be32 old_saddr = inet->saddr; 1047 __be32 new_saddr; 1048 __be32 daddr = inet->daddr; 1049 1050 if (inet->opt && inet->opt->srr) 1051 daddr = inet->opt->faddr; 1052 1053 /* Query new route. */ 1054 err = ip_route_connect(&rt, daddr, 0, 1055 RT_CONN_FLAGS(sk), 1056 sk->sk_bound_dev_if, 1057 sk->sk_protocol, 1058 inet->sport, inet->dport, sk, 0); 1059 if (err) 1060 return err; 1061 1062 sk_setup_caps(sk, &rt->u.dst); 1063 1064 new_saddr = rt->rt_src; 1065 1066 if (new_saddr == old_saddr) 1067 return 0; 1068 1069 if (sysctl_ip_dynaddr > 1) { 1070 printk(KERN_INFO "%s(): shifting inet->saddr from %pI4 to %pI4\n", 1071 __func__, &old_saddr, &new_saddr); 1072 } 1073 1074 inet->saddr = inet->rcv_saddr = new_saddr; 1075 1076 /* 1077 * XXX The only one ugly spot where we need to 1078 * XXX really change the sockets identity after 1079 * XXX it has entered the hashes. -DaveM 1080 * 1081 * Besides that, it does not check for connection 1082 * uniqueness. Wait for troubles. 1083 */ 1084 __sk_prot_rehash(sk); 1085 return 0; 1086 } 1087 1088 int inet_sk_rebuild_header(struct sock *sk) 1089 { 1090 struct inet_sock *inet = inet_sk(sk); 1091 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); 1092 __be32 daddr; 1093 int err; 1094 1095 /* Route is OK, nothing to do. */ 1096 if (rt) 1097 return 0; 1098 1099 /* Reroute. */ 1100 daddr = inet->daddr; 1101 if (inet->opt && inet->opt->srr) 1102 daddr = inet->opt->faddr; 1103 { 1104 struct flowi fl = { 1105 .oif = sk->sk_bound_dev_if, 1106 .nl_u = { 1107 .ip4_u = { 1108 .daddr = daddr, 1109 .saddr = inet->saddr, 1110 .tos = RT_CONN_FLAGS(sk), 1111 }, 1112 }, 1113 .proto = sk->sk_protocol, 1114 .flags = inet_sk_flowi_flags(sk), 1115 .uli_u = { 1116 .ports = { 1117 .sport = inet->sport, 1118 .dport = inet->dport, 1119 }, 1120 }, 1121 }; 1122 1123 security_sk_classify_flow(sk, &fl); 1124 err = ip_route_output_flow(sock_net(sk), &rt, &fl, sk, 0); 1125 } 1126 if (!err) 1127 sk_setup_caps(sk, &rt->u.dst); 1128 else { 1129 /* Routing failed... */ 1130 sk->sk_route_caps = 0; 1131 /* 1132 * Other protocols have to map its equivalent state to TCP_SYN_SENT. 1133 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme 1134 */ 1135 if (!sysctl_ip_dynaddr || 1136 sk->sk_state != TCP_SYN_SENT || 1137 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 1138 (err = inet_sk_reselect_saddr(sk)) != 0) 1139 sk->sk_err_soft = -err; 1140 } 1141 1142 return err; 1143 } 1144 1145 EXPORT_SYMBOL(inet_sk_rebuild_header); 1146 1147 static int inet_gso_send_check(struct sk_buff *skb) 1148 { 1149 struct iphdr *iph; 1150 struct net_protocol *ops; 1151 int proto; 1152 int ihl; 1153 int err = -EINVAL; 1154 1155 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1156 goto out; 1157 1158 iph = ip_hdr(skb); 1159 ihl = iph->ihl * 4; 1160 if (ihl < sizeof(*iph)) 1161 goto out; 1162 1163 if (unlikely(!pskb_may_pull(skb, ihl))) 1164 goto out; 1165 1166 __skb_pull(skb, ihl); 1167 skb_reset_transport_header(skb); 1168 iph = ip_hdr(skb); 1169 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1170 err = -EPROTONOSUPPORT; 1171 1172 rcu_read_lock(); 1173 ops = rcu_dereference(inet_protos[proto]); 1174 if (likely(ops && ops->gso_send_check)) 1175 err = ops->gso_send_check(skb); 1176 rcu_read_unlock(); 1177 1178 out: 1179 return err; 1180 } 1181 1182 static struct sk_buff *inet_gso_segment(struct sk_buff *skb, int features) 1183 { 1184 struct sk_buff *segs = ERR_PTR(-EINVAL); 1185 struct iphdr *iph; 1186 struct net_protocol *ops; 1187 int proto; 1188 int ihl; 1189 int id; 1190 1191 if (!(features & NETIF_F_V4_CSUM)) 1192 features &= ~NETIF_F_SG; 1193 1194 if (unlikely(skb_shinfo(skb)->gso_type & 1195 ~(SKB_GSO_TCPV4 | 1196 SKB_GSO_UDP | 1197 SKB_GSO_DODGY | 1198 SKB_GSO_TCP_ECN | 1199 0))) 1200 goto out; 1201 1202 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1203 goto out; 1204 1205 iph = ip_hdr(skb); 1206 ihl = iph->ihl * 4; 1207 if (ihl < sizeof(*iph)) 1208 goto out; 1209 1210 if (unlikely(!pskb_may_pull(skb, ihl))) 1211 goto out; 1212 1213 __skb_pull(skb, ihl); 1214 skb_reset_transport_header(skb); 1215 iph = ip_hdr(skb); 1216 id = ntohs(iph->id); 1217 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1218 segs = ERR_PTR(-EPROTONOSUPPORT); 1219 1220 rcu_read_lock(); 1221 ops = rcu_dereference(inet_protos[proto]); 1222 if (likely(ops && ops->gso_segment)) 1223 segs = ops->gso_segment(skb, features); 1224 rcu_read_unlock(); 1225 1226 if (!segs || IS_ERR(segs)) 1227 goto out; 1228 1229 skb = segs; 1230 do { 1231 iph = ip_hdr(skb); 1232 iph->id = htons(id++); 1233 iph->tot_len = htons(skb->len - skb->mac_len); 1234 iph->check = 0; 1235 iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl); 1236 } while ((skb = skb->next)); 1237 1238 out: 1239 return segs; 1240 } 1241 1242 static struct sk_buff **inet_gro_receive(struct sk_buff **head, 1243 struct sk_buff *skb) 1244 { 1245 struct net_protocol *ops; 1246 struct sk_buff **pp = NULL; 1247 struct sk_buff *p; 1248 struct iphdr *iph; 1249 unsigned int hlen; 1250 unsigned int off; 1251 unsigned int id; 1252 int flush = 1; 1253 int proto; 1254 1255 off = skb_gro_offset(skb); 1256 hlen = off + sizeof(*iph); 1257 iph = skb_gro_header_fast(skb, off); 1258 if (skb_gro_header_hard(skb, hlen)) { 1259 iph = skb_gro_header_slow(skb, hlen, off); 1260 if (unlikely(!iph)) 1261 goto out; 1262 } 1263 1264 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1265 1266 rcu_read_lock(); 1267 ops = rcu_dereference(inet_protos[proto]); 1268 if (!ops || !ops->gro_receive) 1269 goto out_unlock; 1270 1271 if (*(u8 *)iph != 0x45) 1272 goto out_unlock; 1273 1274 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) 1275 goto out_unlock; 1276 1277 id = ntohl(*(u32 *)&iph->id); 1278 flush = (u16)((ntohl(*(u32 *)iph) ^ skb_gro_len(skb)) | (id ^ IP_DF)); 1279 id >>= 16; 1280 1281 for (p = *head; p; p = p->next) { 1282 struct iphdr *iph2; 1283 1284 if (!NAPI_GRO_CB(p)->same_flow) 1285 continue; 1286 1287 iph2 = ip_hdr(p); 1288 1289 if ((iph->protocol ^ iph2->protocol) | 1290 (iph->tos ^ iph2->tos) | 1291 (iph->saddr ^ iph2->saddr) | 1292 (iph->daddr ^ iph2->daddr)) { 1293 NAPI_GRO_CB(p)->same_flow = 0; 1294 continue; 1295 } 1296 1297 /* All fields must match except length and checksum. */ 1298 NAPI_GRO_CB(p)->flush |= 1299 (iph->ttl ^ iph2->ttl) | 1300 ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id); 1301 1302 NAPI_GRO_CB(p)->flush |= flush; 1303 } 1304 1305 NAPI_GRO_CB(skb)->flush |= flush; 1306 skb_gro_pull(skb, sizeof(*iph)); 1307 skb_set_transport_header(skb, skb_gro_offset(skb)); 1308 1309 pp = ops->gro_receive(head, skb); 1310 1311 out_unlock: 1312 rcu_read_unlock(); 1313 1314 out: 1315 NAPI_GRO_CB(skb)->flush |= flush; 1316 1317 return pp; 1318 } 1319 1320 static int inet_gro_complete(struct sk_buff *skb) 1321 { 1322 struct net_protocol *ops; 1323 struct iphdr *iph = ip_hdr(skb); 1324 int proto = iph->protocol & (MAX_INET_PROTOS - 1); 1325 int err = -ENOSYS; 1326 __be16 newlen = htons(skb->len - skb_network_offset(skb)); 1327 1328 csum_replace2(&iph->check, iph->tot_len, newlen); 1329 iph->tot_len = newlen; 1330 1331 rcu_read_lock(); 1332 ops = rcu_dereference(inet_protos[proto]); 1333 if (WARN_ON(!ops || !ops->gro_complete)) 1334 goto out_unlock; 1335 1336 err = ops->gro_complete(skb); 1337 1338 out_unlock: 1339 rcu_read_unlock(); 1340 1341 return err; 1342 } 1343 1344 int inet_ctl_sock_create(struct sock **sk, unsigned short family, 1345 unsigned short type, unsigned char protocol, 1346 struct net *net) 1347 { 1348 struct socket *sock; 1349 int rc = sock_create_kern(family, type, protocol, &sock); 1350 1351 if (rc == 0) { 1352 *sk = sock->sk; 1353 (*sk)->sk_allocation = GFP_ATOMIC; 1354 /* 1355 * Unhash it so that IP input processing does not even see it, 1356 * we do not wish this socket to see incoming packets. 1357 */ 1358 (*sk)->sk_prot->unhash(*sk); 1359 1360 sk_change_net(*sk, net); 1361 } 1362 return rc; 1363 } 1364 1365 EXPORT_SYMBOL_GPL(inet_ctl_sock_create); 1366 1367 unsigned long snmp_fold_field(void *mib[], int offt) 1368 { 1369 unsigned long res = 0; 1370 int i; 1371 1372 for_each_possible_cpu(i) { 1373 res += *(((unsigned long *) per_cpu_ptr(mib[0], i)) + offt); 1374 res += *(((unsigned long *) per_cpu_ptr(mib[1], i)) + offt); 1375 } 1376 return res; 1377 } 1378 EXPORT_SYMBOL_GPL(snmp_fold_field); 1379 1380 int snmp_mib_init(void *ptr[2], size_t mibsize) 1381 { 1382 BUG_ON(ptr == NULL); 1383 ptr[0] = __alloc_percpu(mibsize, __alignof__(unsigned long long)); 1384 if (!ptr[0]) 1385 goto err0; 1386 ptr[1] = __alloc_percpu(mibsize, __alignof__(unsigned long long)); 1387 if (!ptr[1]) 1388 goto err1; 1389 return 0; 1390 err1: 1391 free_percpu(ptr[0]); 1392 ptr[0] = NULL; 1393 err0: 1394 return -ENOMEM; 1395 } 1396 EXPORT_SYMBOL_GPL(snmp_mib_init); 1397 1398 void snmp_mib_free(void *ptr[2]) 1399 { 1400 BUG_ON(ptr == NULL); 1401 free_percpu(ptr[0]); 1402 free_percpu(ptr[1]); 1403 ptr[0] = ptr[1] = NULL; 1404 } 1405 EXPORT_SYMBOL_GPL(snmp_mib_free); 1406 1407 #ifdef CONFIG_IP_MULTICAST 1408 static struct net_protocol igmp_protocol = { 1409 .handler = igmp_rcv, 1410 .netns_ok = 1, 1411 }; 1412 #endif 1413 1414 static struct net_protocol tcp_protocol = { 1415 .handler = tcp_v4_rcv, 1416 .err_handler = tcp_v4_err, 1417 .gso_send_check = tcp_v4_gso_send_check, 1418 .gso_segment = tcp_tso_segment, 1419 .gro_receive = tcp4_gro_receive, 1420 .gro_complete = tcp4_gro_complete, 1421 .no_policy = 1, 1422 .netns_ok = 1, 1423 }; 1424 1425 static struct net_protocol udp_protocol = { 1426 .handler = udp_rcv, 1427 .err_handler = udp_err, 1428 .no_policy = 1, 1429 .netns_ok = 1, 1430 }; 1431 1432 static struct net_protocol icmp_protocol = { 1433 .handler = icmp_rcv, 1434 .no_policy = 1, 1435 .netns_ok = 1, 1436 }; 1437 1438 static __net_init int ipv4_mib_init_net(struct net *net) 1439 { 1440 if (snmp_mib_init((void **)net->mib.tcp_statistics, 1441 sizeof(struct tcp_mib)) < 0) 1442 goto err_tcp_mib; 1443 if (snmp_mib_init((void **)net->mib.ip_statistics, 1444 sizeof(struct ipstats_mib)) < 0) 1445 goto err_ip_mib; 1446 if (snmp_mib_init((void **)net->mib.net_statistics, 1447 sizeof(struct linux_mib)) < 0) 1448 goto err_net_mib; 1449 if (snmp_mib_init((void **)net->mib.udp_statistics, 1450 sizeof(struct udp_mib)) < 0) 1451 goto err_udp_mib; 1452 if (snmp_mib_init((void **)net->mib.udplite_statistics, 1453 sizeof(struct udp_mib)) < 0) 1454 goto err_udplite_mib; 1455 if (snmp_mib_init((void **)net->mib.icmp_statistics, 1456 sizeof(struct icmp_mib)) < 0) 1457 goto err_icmp_mib; 1458 if (snmp_mib_init((void **)net->mib.icmpmsg_statistics, 1459 sizeof(struct icmpmsg_mib)) < 0) 1460 goto err_icmpmsg_mib; 1461 1462 tcp_mib_init(net); 1463 return 0; 1464 1465 err_icmpmsg_mib: 1466 snmp_mib_free((void **)net->mib.icmp_statistics); 1467 err_icmp_mib: 1468 snmp_mib_free((void **)net->mib.udplite_statistics); 1469 err_udplite_mib: 1470 snmp_mib_free((void **)net->mib.udp_statistics); 1471 err_udp_mib: 1472 snmp_mib_free((void **)net->mib.net_statistics); 1473 err_net_mib: 1474 snmp_mib_free((void **)net->mib.ip_statistics); 1475 err_ip_mib: 1476 snmp_mib_free((void **)net->mib.tcp_statistics); 1477 err_tcp_mib: 1478 return -ENOMEM; 1479 } 1480 1481 static __net_exit void ipv4_mib_exit_net(struct net *net) 1482 { 1483 snmp_mib_free((void **)net->mib.icmpmsg_statistics); 1484 snmp_mib_free((void **)net->mib.icmp_statistics); 1485 snmp_mib_free((void **)net->mib.udplite_statistics); 1486 snmp_mib_free((void **)net->mib.udp_statistics); 1487 snmp_mib_free((void **)net->mib.net_statistics); 1488 snmp_mib_free((void **)net->mib.ip_statistics); 1489 snmp_mib_free((void **)net->mib.tcp_statistics); 1490 } 1491 1492 static __net_initdata struct pernet_operations ipv4_mib_ops = { 1493 .init = ipv4_mib_init_net, 1494 .exit = ipv4_mib_exit_net, 1495 }; 1496 1497 static int __init init_ipv4_mibs(void) 1498 { 1499 return register_pernet_subsys(&ipv4_mib_ops); 1500 } 1501 1502 static int ipv4_proc_init(void); 1503 1504 /* 1505 * IP protocol layer initialiser 1506 */ 1507 1508 static struct packet_type ip_packet_type __read_mostly = { 1509 .type = cpu_to_be16(ETH_P_IP), 1510 .func = ip_rcv, 1511 .gso_send_check = inet_gso_send_check, 1512 .gso_segment = inet_gso_segment, 1513 .gro_receive = inet_gro_receive, 1514 .gro_complete = inet_gro_complete, 1515 }; 1516 1517 static int __init inet_init(void) 1518 { 1519 struct sk_buff *dummy_skb; 1520 struct inet_protosw *q; 1521 struct list_head *r; 1522 int rc = -EINVAL; 1523 1524 BUILD_BUG_ON(sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb)); 1525 1526 rc = proto_register(&tcp_prot, 1); 1527 if (rc) 1528 goto out; 1529 1530 rc = proto_register(&udp_prot, 1); 1531 if (rc) 1532 goto out_unregister_tcp_proto; 1533 1534 rc = proto_register(&raw_prot, 1); 1535 if (rc) 1536 goto out_unregister_udp_proto; 1537 1538 /* 1539 * Tell SOCKET that we are alive... 1540 */ 1541 1542 (void)sock_register(&inet_family_ops); 1543 1544 #ifdef CONFIG_SYSCTL 1545 ip_static_sysctl_init(); 1546 #endif 1547 1548 /* 1549 * Add all the base protocols. 1550 */ 1551 1552 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 1553 printk(KERN_CRIT "inet_init: Cannot add ICMP protocol\n"); 1554 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) 1555 printk(KERN_CRIT "inet_init: Cannot add UDP protocol\n"); 1556 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) 1557 printk(KERN_CRIT "inet_init: Cannot add TCP protocol\n"); 1558 #ifdef CONFIG_IP_MULTICAST 1559 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 1560 printk(KERN_CRIT "inet_init: Cannot add IGMP protocol\n"); 1561 #endif 1562 1563 /* Register the socket-side information for inet_create. */ 1564 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 1565 INIT_LIST_HEAD(r); 1566 1567 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 1568 inet_register_protosw(q); 1569 1570 /* 1571 * Set the ARP module up 1572 */ 1573 1574 arp_init(); 1575 1576 /* 1577 * Set the IP module up 1578 */ 1579 1580 ip_init(); 1581 1582 tcp_v4_init(); 1583 1584 /* Setup TCP slab cache for open requests. */ 1585 tcp_init(); 1586 1587 /* Setup UDP memory threshold */ 1588 udp_init(); 1589 1590 /* Add UDP-Lite (RFC 3828) */ 1591 udplite4_register(); 1592 1593 /* 1594 * Set the ICMP layer up 1595 */ 1596 1597 if (icmp_init() < 0) 1598 panic("Failed to create the ICMP control socket.\n"); 1599 1600 /* 1601 * Initialise the multicast router 1602 */ 1603 #if defined(CONFIG_IP_MROUTE) 1604 if (ip_mr_init()) 1605 printk(KERN_CRIT "inet_init: Cannot init ipv4 mroute\n"); 1606 #endif 1607 /* 1608 * Initialise per-cpu ipv4 mibs 1609 */ 1610 1611 if (init_ipv4_mibs()) 1612 printk(KERN_CRIT "inet_init: Cannot init ipv4 mibs\n"); 1613 1614 ipv4_proc_init(); 1615 1616 ipfrag_init(); 1617 1618 dev_add_pack(&ip_packet_type); 1619 1620 rc = 0; 1621 out: 1622 return rc; 1623 out_unregister_udp_proto: 1624 proto_unregister(&udp_prot); 1625 out_unregister_tcp_proto: 1626 proto_unregister(&tcp_prot); 1627 goto out; 1628 } 1629 1630 fs_initcall(inet_init); 1631 1632 /* ------------------------------------------------------------------------ */ 1633 1634 #ifdef CONFIG_PROC_FS 1635 static int __init ipv4_proc_init(void) 1636 { 1637 int rc = 0; 1638 1639 if (raw_proc_init()) 1640 goto out_raw; 1641 if (tcp4_proc_init()) 1642 goto out_tcp; 1643 if (udp4_proc_init()) 1644 goto out_udp; 1645 if (ip_misc_proc_init()) 1646 goto out_misc; 1647 out: 1648 return rc; 1649 out_misc: 1650 udp4_proc_exit(); 1651 out_udp: 1652 tcp4_proc_exit(); 1653 out_tcp: 1654 raw_proc_exit(); 1655 out_raw: 1656 rc = -ENOMEM; 1657 goto out; 1658 } 1659 1660 #else /* CONFIG_PROC_FS */ 1661 static int __init ipv4_proc_init(void) 1662 { 1663 return 0; 1664 } 1665 #endif /* CONFIG_PROC_FS */ 1666 1667 MODULE_ALIAS_NETPROTO(PF_INET); 1668 1669 EXPORT_SYMBOL(inet_accept); 1670 EXPORT_SYMBOL(inet_bind); 1671 EXPORT_SYMBOL(inet_dgram_connect); 1672 EXPORT_SYMBOL(inet_dgram_ops); 1673 EXPORT_SYMBOL(inet_getname); 1674 EXPORT_SYMBOL(inet_ioctl); 1675 EXPORT_SYMBOL(inet_listen); 1676 EXPORT_SYMBOL(inet_register_protosw); 1677 EXPORT_SYMBOL(inet_release); 1678 EXPORT_SYMBOL(inet_sendmsg); 1679 EXPORT_SYMBOL(inet_shutdown); 1680 EXPORT_SYMBOL(inet_sock_destruct); 1681 EXPORT_SYMBOL(inet_stream_connect); 1682 EXPORT_SYMBOL(inet_stream_ops); 1683 EXPORT_SYMBOL(inet_unregister_protosw); 1684 EXPORT_SYMBOL(sysctl_ip_nonlocal_bind); 1685