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 extern void ip_mc_drop_socket(struct sock *sk); 120 121 /* The inetsw table contains everything that inet_create needs to 122 * build a new socket. 123 */ 124 static struct list_head inetsw[SOCK_MAX]; 125 static DEFINE_SPINLOCK(inetsw_lock); 126 127 struct ipv4_config ipv4_config; 128 129 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 printk("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 printk("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(inet->opt); 158 dst_release(sk->sk_dst_cache); 159 sk_refcnt_debug_dec(sk); 160 } 161 162 /* 163 * The routines beyond this point handle the behaviour of an AF_INET 164 * socket object. Mostly it punts to the subprotocols of IP to do 165 * the work. 166 */ 167 168 /* 169 * Automatically bind an unbound socket. 170 */ 171 172 static int inet_autobind(struct sock *sk) 173 { 174 struct inet_sock *inet; 175 /* We may need to bind the socket. */ 176 lock_sock(sk); 177 inet = inet_sk(sk); 178 if (!inet->num) { 179 if (sk->sk_prot->get_port(sk, 0)) { 180 release_sock(sk); 181 return -EAGAIN; 182 } 183 inet->sport = htons(inet->num); 184 } 185 release_sock(sk); 186 return 0; 187 } 188 189 /* 190 * Move a socket into listening state. 191 */ 192 int inet_listen(struct socket *sock, int backlog) 193 { 194 struct sock *sk = sock->sk; 195 unsigned char old_state; 196 int err; 197 198 lock_sock(sk); 199 200 err = -EINVAL; 201 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM) 202 goto out; 203 204 old_state = sk->sk_state; 205 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN))) 206 goto out; 207 208 /* Really, if the socket is already in listen state 209 * we can only allow the backlog to be adjusted. 210 */ 211 if (old_state != TCP_LISTEN) { 212 err = inet_csk_listen_start(sk, backlog); 213 if (err) 214 goto out; 215 } 216 sk->sk_max_ack_backlog = backlog; 217 err = 0; 218 219 out: 220 release_sock(sk); 221 return err; 222 } 223 224 u32 inet_ehash_secret __read_mostly; 225 EXPORT_SYMBOL(inet_ehash_secret); 226 227 /* 228 * inet_ehash_secret must be set exactly once 229 * Instead of using a dedicated spinlock, we (ab)use inetsw_lock 230 */ 231 void build_ehash_secret(void) 232 { 233 u32 rnd; 234 do { 235 get_random_bytes(&rnd, sizeof(rnd)); 236 } while (rnd == 0); 237 spin_lock_bh(&inetsw_lock); 238 if (!inet_ehash_secret) 239 inet_ehash_secret = rnd; 240 spin_unlock_bh(&inetsw_lock); 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 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 { 267 struct sock *sk; 268 struct inet_protosw *answer; 269 struct inet_sock *inet; 270 struct proto *answer_prot; 271 unsigned char answer_flags; 272 char answer_no_check; 273 int try_loading_module = 0; 274 int err; 275 276 if (unlikely(!inet_ehash_secret)) 277 if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM) 278 build_ehash_secret(); 279 280 sock->state = SS_UNCONNECTED; 281 282 /* Look for the requested type/protocol pair. */ 283 lookup_protocol: 284 err = -ESOCKTNOSUPPORT; 285 rcu_read_lock(); 286 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) { 287 288 err = 0; 289 /* Check the non-wild match. */ 290 if (protocol == answer->protocol) { 291 if (protocol != IPPROTO_IP) 292 break; 293 } else { 294 /* Check for the two wild cases. */ 295 if (IPPROTO_IP == protocol) { 296 protocol = answer->protocol; 297 break; 298 } 299 if (IPPROTO_IP == answer->protocol) 300 break; 301 } 302 err = -EPROTONOSUPPORT; 303 } 304 305 if (unlikely(err)) { 306 if (try_loading_module < 2) { 307 rcu_read_unlock(); 308 /* 309 * Be more specific, e.g. net-pf-2-proto-132-type-1 310 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) 311 */ 312 if (++try_loading_module == 1) 313 request_module("net-pf-%d-proto-%d-type-%d", 314 PF_INET, protocol, sock->type); 315 /* 316 * Fall back to generic, e.g. net-pf-2-proto-132 317 * (net-pf-PF_INET-proto-IPPROTO_SCTP) 318 */ 319 else 320 request_module("net-pf-%d-proto-%d", 321 PF_INET, protocol); 322 goto lookup_protocol; 323 } else 324 goto out_rcu_unlock; 325 } 326 327 err = -EPERM; 328 if (answer->capability > 0 && !capable(answer->capability)) 329 goto out_rcu_unlock; 330 331 err = -EAFNOSUPPORT; 332 if (!inet_netns_ok(net, protocol)) 333 goto out_rcu_unlock; 334 335 sock->ops = answer->ops; 336 answer_prot = answer->prot; 337 answer_no_check = answer->no_check; 338 answer_flags = answer->flags; 339 rcu_read_unlock(); 340 341 WARN_ON(answer_prot->slab == NULL); 342 343 err = -ENOBUFS; 344 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot); 345 if (sk == NULL) 346 goto out; 347 348 err = 0; 349 sk->sk_no_check = answer_no_check; 350 if (INET_PROTOSW_REUSE & answer_flags) 351 sk->sk_reuse = 1; 352 353 inet = inet_sk(sk); 354 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 355 356 if (SOCK_RAW == sock->type) { 357 inet->num = protocol; 358 if (IPPROTO_RAW == protocol) 359 inet->hdrincl = 1; 360 } 361 362 if (ipv4_config.no_pmtu_disc) 363 inet->pmtudisc = IP_PMTUDISC_DONT; 364 else 365 inet->pmtudisc = IP_PMTUDISC_WANT; 366 367 inet->id = 0; 368 369 sock_init_data(sock, sk); 370 371 sk->sk_destruct = inet_sock_destruct; 372 sk->sk_protocol = protocol; 373 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 374 375 inet->uc_ttl = -1; 376 inet->mc_loop = 1; 377 inet->mc_ttl = 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 synchronize_net(); 1007 1008 return; 1009 1010 out_permanent: 1011 printk(KERN_ERR "Attempt to override permanent protocol %d.\n", 1012 protocol); 1013 goto out; 1014 1015 out_illegal: 1016 printk(KERN_ERR 1017 "Ignoring attempt to register invalid socket type %d.\n", 1018 p->type); 1019 goto out; 1020 } 1021 1022 void inet_unregister_protosw(struct inet_protosw *p) 1023 { 1024 if (INET_PROTOSW_PERMANENT & p->flags) { 1025 printk(KERN_ERR 1026 "Attempt to unregister permanent protocol %d.\n", 1027 p->protocol); 1028 } else { 1029 spin_lock_bh(&inetsw_lock); 1030 list_del_rcu(&p->list); 1031 spin_unlock_bh(&inetsw_lock); 1032 1033 synchronize_net(); 1034 } 1035 } 1036 1037 /* 1038 * Shall we try to damage output packets if routing dev changes? 1039 */ 1040 1041 int sysctl_ip_dynaddr __read_mostly; 1042 1043 static int inet_sk_reselect_saddr(struct sock *sk) 1044 { 1045 struct inet_sock *inet = inet_sk(sk); 1046 int err; 1047 struct rtable *rt; 1048 __be32 old_saddr = inet->saddr; 1049 __be32 new_saddr; 1050 __be32 daddr = inet->daddr; 1051 1052 if (inet->opt && inet->opt->srr) 1053 daddr = inet->opt->faddr; 1054 1055 /* Query new route. */ 1056 err = ip_route_connect(&rt, daddr, 0, 1057 RT_CONN_FLAGS(sk), 1058 sk->sk_bound_dev_if, 1059 sk->sk_protocol, 1060 inet->sport, inet->dport, sk, 0); 1061 if (err) 1062 return err; 1063 1064 sk_setup_caps(sk, &rt->u.dst); 1065 1066 new_saddr = rt->rt_src; 1067 1068 if (new_saddr == old_saddr) 1069 return 0; 1070 1071 if (sysctl_ip_dynaddr > 1) { 1072 printk(KERN_INFO "%s(): shifting inet->saddr from %pI4 to %pI4\n", 1073 __func__, &old_saddr, &new_saddr); 1074 } 1075 1076 inet->saddr = inet->rcv_saddr = new_saddr; 1077 1078 /* 1079 * XXX The only one ugly spot where we need to 1080 * XXX really change the sockets identity after 1081 * XXX it has entered the hashes. -DaveM 1082 * 1083 * Besides that, it does not check for connection 1084 * uniqueness. Wait for troubles. 1085 */ 1086 __sk_prot_rehash(sk); 1087 return 0; 1088 } 1089 1090 int inet_sk_rebuild_header(struct sock *sk) 1091 { 1092 struct inet_sock *inet = inet_sk(sk); 1093 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); 1094 __be32 daddr; 1095 int err; 1096 1097 /* Route is OK, nothing to do. */ 1098 if (rt) 1099 return 0; 1100 1101 /* Reroute. */ 1102 daddr = inet->daddr; 1103 if (inet->opt && inet->opt->srr) 1104 daddr = inet->opt->faddr; 1105 { 1106 struct flowi fl = { 1107 .oif = sk->sk_bound_dev_if, 1108 .nl_u = { 1109 .ip4_u = { 1110 .daddr = daddr, 1111 .saddr = inet->saddr, 1112 .tos = RT_CONN_FLAGS(sk), 1113 }, 1114 }, 1115 .proto = sk->sk_protocol, 1116 .flags = inet_sk_flowi_flags(sk), 1117 .uli_u = { 1118 .ports = { 1119 .sport = inet->sport, 1120 .dport = inet->dport, 1121 }, 1122 }, 1123 }; 1124 1125 security_sk_classify_flow(sk, &fl); 1126 err = ip_route_output_flow(sock_net(sk), &rt, &fl, sk, 0); 1127 } 1128 if (!err) 1129 sk_setup_caps(sk, &rt->u.dst); 1130 else { 1131 /* Routing failed... */ 1132 sk->sk_route_caps = 0; 1133 /* 1134 * Other protocols have to map its equivalent state to TCP_SYN_SENT. 1135 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme 1136 */ 1137 if (!sysctl_ip_dynaddr || 1138 sk->sk_state != TCP_SYN_SENT || 1139 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 1140 (err = inet_sk_reselect_saddr(sk)) != 0) 1141 sk->sk_err_soft = -err; 1142 } 1143 1144 return err; 1145 } 1146 1147 EXPORT_SYMBOL(inet_sk_rebuild_header); 1148 1149 static int inet_gso_send_check(struct sk_buff *skb) 1150 { 1151 struct iphdr *iph; 1152 struct net_protocol *ops; 1153 int proto; 1154 int ihl; 1155 int err = -EINVAL; 1156 1157 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1158 goto out; 1159 1160 iph = ip_hdr(skb); 1161 ihl = iph->ihl * 4; 1162 if (ihl < sizeof(*iph)) 1163 goto out; 1164 1165 if (unlikely(!pskb_may_pull(skb, ihl))) 1166 goto out; 1167 1168 __skb_pull(skb, ihl); 1169 skb_reset_transport_header(skb); 1170 iph = ip_hdr(skb); 1171 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1172 err = -EPROTONOSUPPORT; 1173 1174 rcu_read_lock(); 1175 ops = rcu_dereference(inet_protos[proto]); 1176 if (likely(ops && ops->gso_send_check)) 1177 err = ops->gso_send_check(skb); 1178 rcu_read_unlock(); 1179 1180 out: 1181 return err; 1182 } 1183 1184 static struct sk_buff *inet_gso_segment(struct sk_buff *skb, int features) 1185 { 1186 struct sk_buff *segs = ERR_PTR(-EINVAL); 1187 struct iphdr *iph; 1188 struct net_protocol *ops; 1189 int proto; 1190 int ihl; 1191 int id; 1192 1193 if (!(features & NETIF_F_V4_CSUM)) 1194 features &= ~NETIF_F_SG; 1195 1196 if (unlikely(skb_shinfo(skb)->gso_type & 1197 ~(SKB_GSO_TCPV4 | 1198 SKB_GSO_UDP | 1199 SKB_GSO_DODGY | 1200 SKB_GSO_TCP_ECN | 1201 0))) 1202 goto out; 1203 1204 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1205 goto out; 1206 1207 iph = ip_hdr(skb); 1208 ihl = iph->ihl * 4; 1209 if (ihl < sizeof(*iph)) 1210 goto out; 1211 1212 if (unlikely(!pskb_may_pull(skb, ihl))) 1213 goto out; 1214 1215 __skb_pull(skb, ihl); 1216 skb_reset_transport_header(skb); 1217 iph = ip_hdr(skb); 1218 id = ntohs(iph->id); 1219 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1220 segs = ERR_PTR(-EPROTONOSUPPORT); 1221 1222 rcu_read_lock(); 1223 ops = rcu_dereference(inet_protos[proto]); 1224 if (likely(ops && ops->gso_segment)) 1225 segs = ops->gso_segment(skb, features); 1226 rcu_read_unlock(); 1227 1228 if (!segs || IS_ERR(segs)) 1229 goto out; 1230 1231 skb = segs; 1232 do { 1233 iph = ip_hdr(skb); 1234 iph->id = htons(id++); 1235 iph->tot_len = htons(skb->len - skb->mac_len); 1236 iph->check = 0; 1237 iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl); 1238 } while ((skb = skb->next)); 1239 1240 out: 1241 return segs; 1242 } 1243 1244 static struct sk_buff **inet_gro_receive(struct sk_buff **head, 1245 struct sk_buff *skb) 1246 { 1247 struct net_protocol *ops; 1248 struct sk_buff **pp = NULL; 1249 struct sk_buff *p; 1250 struct iphdr *iph; 1251 int flush = 1; 1252 int proto; 1253 int id; 1254 1255 iph = skb_gro_header(skb, sizeof(*iph)); 1256 if (unlikely(!iph)) 1257 goto out; 1258 1259 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1260 1261 rcu_read_lock(); 1262 ops = rcu_dereference(inet_protos[proto]); 1263 if (!ops || !ops->gro_receive) 1264 goto out_unlock; 1265 1266 if (*(u8 *)iph != 0x45) 1267 goto out_unlock; 1268 1269 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) 1270 goto out_unlock; 1271 1272 flush = ntohs(iph->tot_len) != skb_gro_len(skb) || 1273 iph->frag_off != htons(IP_DF); 1274 id = ntohs(iph->id); 1275 1276 for (p = *head; p; p = p->next) { 1277 struct iphdr *iph2; 1278 1279 if (!NAPI_GRO_CB(p)->same_flow) 1280 continue; 1281 1282 iph2 = ip_hdr(p); 1283 1284 if ((iph->protocol ^ iph2->protocol) | 1285 (iph->tos ^ iph2->tos) | 1286 (iph->saddr ^ iph2->saddr) | 1287 (iph->daddr ^ iph2->daddr)) { 1288 NAPI_GRO_CB(p)->same_flow = 0; 1289 continue; 1290 } 1291 1292 /* All fields must match except length and checksum. */ 1293 NAPI_GRO_CB(p)->flush |= 1294 (iph->ttl ^ iph2->ttl) | 1295 ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id); 1296 1297 NAPI_GRO_CB(p)->flush |= flush; 1298 } 1299 1300 NAPI_GRO_CB(skb)->flush |= flush; 1301 skb_gro_pull(skb, sizeof(*iph)); 1302 skb_set_transport_header(skb, skb_gro_offset(skb)); 1303 1304 pp = ops->gro_receive(head, skb); 1305 1306 out_unlock: 1307 rcu_read_unlock(); 1308 1309 out: 1310 NAPI_GRO_CB(skb)->flush |= flush; 1311 1312 return pp; 1313 } 1314 1315 static int inet_gro_complete(struct sk_buff *skb) 1316 { 1317 struct net_protocol *ops; 1318 struct iphdr *iph = ip_hdr(skb); 1319 int proto = iph->protocol & (MAX_INET_PROTOS - 1); 1320 int err = -ENOSYS; 1321 __be16 newlen = htons(skb->len - skb_network_offset(skb)); 1322 1323 csum_replace2(&iph->check, iph->tot_len, newlen); 1324 iph->tot_len = newlen; 1325 1326 rcu_read_lock(); 1327 ops = rcu_dereference(inet_protos[proto]); 1328 if (WARN_ON(!ops || !ops->gro_complete)) 1329 goto out_unlock; 1330 1331 err = ops->gro_complete(skb); 1332 1333 out_unlock: 1334 rcu_read_unlock(); 1335 1336 return err; 1337 } 1338 1339 int inet_ctl_sock_create(struct sock **sk, unsigned short family, 1340 unsigned short type, unsigned char protocol, 1341 struct net *net) 1342 { 1343 struct socket *sock; 1344 int rc = sock_create_kern(family, type, protocol, &sock); 1345 1346 if (rc == 0) { 1347 *sk = sock->sk; 1348 (*sk)->sk_allocation = GFP_ATOMIC; 1349 /* 1350 * Unhash it so that IP input processing does not even see it, 1351 * we do not wish this socket to see incoming packets. 1352 */ 1353 (*sk)->sk_prot->unhash(*sk); 1354 1355 sk_change_net(*sk, net); 1356 } 1357 return rc; 1358 } 1359 1360 EXPORT_SYMBOL_GPL(inet_ctl_sock_create); 1361 1362 unsigned long snmp_fold_field(void *mib[], int offt) 1363 { 1364 unsigned long res = 0; 1365 int i; 1366 1367 for_each_possible_cpu(i) { 1368 res += *(((unsigned long *) per_cpu_ptr(mib[0], i)) + offt); 1369 res += *(((unsigned long *) per_cpu_ptr(mib[1], i)) + offt); 1370 } 1371 return res; 1372 } 1373 EXPORT_SYMBOL_GPL(snmp_fold_field); 1374 1375 int snmp_mib_init(void *ptr[2], size_t mibsize) 1376 { 1377 BUG_ON(ptr == NULL); 1378 ptr[0] = __alloc_percpu(mibsize, __alignof__(unsigned long long)); 1379 if (!ptr[0]) 1380 goto err0; 1381 ptr[1] = __alloc_percpu(mibsize, __alignof__(unsigned long long)); 1382 if (!ptr[1]) 1383 goto err1; 1384 return 0; 1385 err1: 1386 free_percpu(ptr[0]); 1387 ptr[0] = NULL; 1388 err0: 1389 return -ENOMEM; 1390 } 1391 EXPORT_SYMBOL_GPL(snmp_mib_init); 1392 1393 void snmp_mib_free(void *ptr[2]) 1394 { 1395 BUG_ON(ptr == NULL); 1396 free_percpu(ptr[0]); 1397 free_percpu(ptr[1]); 1398 ptr[0] = ptr[1] = NULL; 1399 } 1400 EXPORT_SYMBOL_GPL(snmp_mib_free); 1401 1402 #ifdef CONFIG_IP_MULTICAST 1403 static struct net_protocol igmp_protocol = { 1404 .handler = igmp_rcv, 1405 .netns_ok = 1, 1406 }; 1407 #endif 1408 1409 static struct net_protocol tcp_protocol = { 1410 .handler = tcp_v4_rcv, 1411 .err_handler = tcp_v4_err, 1412 .gso_send_check = tcp_v4_gso_send_check, 1413 .gso_segment = tcp_tso_segment, 1414 .gro_receive = tcp4_gro_receive, 1415 .gro_complete = tcp4_gro_complete, 1416 .no_policy = 1, 1417 .netns_ok = 1, 1418 }; 1419 1420 static struct net_protocol udp_protocol = { 1421 .handler = udp_rcv, 1422 .err_handler = udp_err, 1423 .no_policy = 1, 1424 .netns_ok = 1, 1425 }; 1426 1427 static struct net_protocol icmp_protocol = { 1428 .handler = icmp_rcv, 1429 .no_policy = 1, 1430 .netns_ok = 1, 1431 }; 1432 1433 static __net_init int ipv4_mib_init_net(struct net *net) 1434 { 1435 if (snmp_mib_init((void **)net->mib.tcp_statistics, 1436 sizeof(struct tcp_mib)) < 0) 1437 goto err_tcp_mib; 1438 if (snmp_mib_init((void **)net->mib.ip_statistics, 1439 sizeof(struct ipstats_mib)) < 0) 1440 goto err_ip_mib; 1441 if (snmp_mib_init((void **)net->mib.net_statistics, 1442 sizeof(struct linux_mib)) < 0) 1443 goto err_net_mib; 1444 if (snmp_mib_init((void **)net->mib.udp_statistics, 1445 sizeof(struct udp_mib)) < 0) 1446 goto err_udp_mib; 1447 if (snmp_mib_init((void **)net->mib.udplite_statistics, 1448 sizeof(struct udp_mib)) < 0) 1449 goto err_udplite_mib; 1450 if (snmp_mib_init((void **)net->mib.icmp_statistics, 1451 sizeof(struct icmp_mib)) < 0) 1452 goto err_icmp_mib; 1453 if (snmp_mib_init((void **)net->mib.icmpmsg_statistics, 1454 sizeof(struct icmpmsg_mib)) < 0) 1455 goto err_icmpmsg_mib; 1456 1457 tcp_mib_init(net); 1458 return 0; 1459 1460 err_icmpmsg_mib: 1461 snmp_mib_free((void **)net->mib.icmp_statistics); 1462 err_icmp_mib: 1463 snmp_mib_free((void **)net->mib.udplite_statistics); 1464 err_udplite_mib: 1465 snmp_mib_free((void **)net->mib.udp_statistics); 1466 err_udp_mib: 1467 snmp_mib_free((void **)net->mib.net_statistics); 1468 err_net_mib: 1469 snmp_mib_free((void **)net->mib.ip_statistics); 1470 err_ip_mib: 1471 snmp_mib_free((void **)net->mib.tcp_statistics); 1472 err_tcp_mib: 1473 return -ENOMEM; 1474 } 1475 1476 static __net_exit void ipv4_mib_exit_net(struct net *net) 1477 { 1478 snmp_mib_free((void **)net->mib.icmpmsg_statistics); 1479 snmp_mib_free((void **)net->mib.icmp_statistics); 1480 snmp_mib_free((void **)net->mib.udplite_statistics); 1481 snmp_mib_free((void **)net->mib.udp_statistics); 1482 snmp_mib_free((void **)net->mib.net_statistics); 1483 snmp_mib_free((void **)net->mib.ip_statistics); 1484 snmp_mib_free((void **)net->mib.tcp_statistics); 1485 } 1486 1487 static __net_initdata struct pernet_operations ipv4_mib_ops = { 1488 .init = ipv4_mib_init_net, 1489 .exit = ipv4_mib_exit_net, 1490 }; 1491 1492 static int __init init_ipv4_mibs(void) 1493 { 1494 return register_pernet_subsys(&ipv4_mib_ops); 1495 } 1496 1497 static int ipv4_proc_init(void); 1498 1499 /* 1500 * IP protocol layer initialiser 1501 */ 1502 1503 static struct packet_type ip_packet_type __read_mostly = { 1504 .type = cpu_to_be16(ETH_P_IP), 1505 .func = ip_rcv, 1506 .gso_send_check = inet_gso_send_check, 1507 .gso_segment = inet_gso_segment, 1508 .gro_receive = inet_gro_receive, 1509 .gro_complete = inet_gro_complete, 1510 }; 1511 1512 static int __init inet_init(void) 1513 { 1514 struct sk_buff *dummy_skb; 1515 struct inet_protosw *q; 1516 struct list_head *r; 1517 int rc = -EINVAL; 1518 1519 BUILD_BUG_ON(sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb)); 1520 1521 rc = proto_register(&tcp_prot, 1); 1522 if (rc) 1523 goto out; 1524 1525 rc = proto_register(&udp_prot, 1); 1526 if (rc) 1527 goto out_unregister_tcp_proto; 1528 1529 rc = proto_register(&raw_prot, 1); 1530 if (rc) 1531 goto out_unregister_udp_proto; 1532 1533 /* 1534 * Tell SOCKET that we are alive... 1535 */ 1536 1537 (void)sock_register(&inet_family_ops); 1538 1539 #ifdef CONFIG_SYSCTL 1540 ip_static_sysctl_init(); 1541 #endif 1542 1543 /* 1544 * Add all the base protocols. 1545 */ 1546 1547 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 1548 printk(KERN_CRIT "inet_init: Cannot add ICMP protocol\n"); 1549 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) 1550 printk(KERN_CRIT "inet_init: Cannot add UDP protocol\n"); 1551 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) 1552 printk(KERN_CRIT "inet_init: Cannot add TCP protocol\n"); 1553 #ifdef CONFIG_IP_MULTICAST 1554 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 1555 printk(KERN_CRIT "inet_init: Cannot add IGMP protocol\n"); 1556 #endif 1557 1558 /* Register the socket-side information for inet_create. */ 1559 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 1560 INIT_LIST_HEAD(r); 1561 1562 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 1563 inet_register_protosw(q); 1564 1565 /* 1566 * Set the ARP module up 1567 */ 1568 1569 arp_init(); 1570 1571 /* 1572 * Set the IP module up 1573 */ 1574 1575 ip_init(); 1576 1577 tcp_v4_init(); 1578 1579 /* Setup TCP slab cache for open requests. */ 1580 tcp_init(); 1581 1582 /* Setup UDP memory threshold */ 1583 udp_init(); 1584 1585 /* Add UDP-Lite (RFC 3828) */ 1586 udplite4_register(); 1587 1588 /* 1589 * Set the ICMP layer up 1590 */ 1591 1592 if (icmp_init() < 0) 1593 panic("Failed to create the ICMP control socket.\n"); 1594 1595 /* 1596 * Initialise the multicast router 1597 */ 1598 #if defined(CONFIG_IP_MROUTE) 1599 if (ip_mr_init()) 1600 printk(KERN_CRIT "inet_init: Cannot init ipv4 mroute\n"); 1601 #endif 1602 /* 1603 * Initialise per-cpu ipv4 mibs 1604 */ 1605 1606 if (init_ipv4_mibs()) 1607 printk(KERN_CRIT "inet_init: Cannot init ipv4 mibs\n"); 1608 1609 ipv4_proc_init(); 1610 1611 ipfrag_init(); 1612 1613 dev_add_pack(&ip_packet_type); 1614 1615 rc = 0; 1616 out: 1617 return rc; 1618 out_unregister_udp_proto: 1619 proto_unregister(&udp_prot); 1620 out_unregister_tcp_proto: 1621 proto_unregister(&tcp_prot); 1622 goto out; 1623 } 1624 1625 fs_initcall(inet_init); 1626 1627 /* ------------------------------------------------------------------------ */ 1628 1629 #ifdef CONFIG_PROC_FS 1630 static int __init ipv4_proc_init(void) 1631 { 1632 int rc = 0; 1633 1634 if (raw_proc_init()) 1635 goto out_raw; 1636 if (tcp4_proc_init()) 1637 goto out_tcp; 1638 if (udp4_proc_init()) 1639 goto out_udp; 1640 if (ip_misc_proc_init()) 1641 goto out_misc; 1642 out: 1643 return rc; 1644 out_misc: 1645 udp4_proc_exit(); 1646 out_udp: 1647 tcp4_proc_exit(); 1648 out_tcp: 1649 raw_proc_exit(); 1650 out_raw: 1651 rc = -ENOMEM; 1652 goto out; 1653 } 1654 1655 #else /* CONFIG_PROC_FS */ 1656 static int __init ipv4_proc_init(void) 1657 { 1658 return 0; 1659 } 1660 #endif /* CONFIG_PROC_FS */ 1661 1662 MODULE_ALIAS_NETPROTO(PF_INET); 1663 1664 EXPORT_SYMBOL(inet_accept); 1665 EXPORT_SYMBOL(inet_bind); 1666 EXPORT_SYMBOL(inet_dgram_connect); 1667 EXPORT_SYMBOL(inet_dgram_ops); 1668 EXPORT_SYMBOL(inet_getname); 1669 EXPORT_SYMBOL(inet_ioctl); 1670 EXPORT_SYMBOL(inet_listen); 1671 EXPORT_SYMBOL(inet_register_protosw); 1672 EXPORT_SYMBOL(inet_release); 1673 EXPORT_SYMBOL(inet_sendmsg); 1674 EXPORT_SYMBOL(inet_shutdown); 1675 EXPORT_SYMBOL(inet_sock_destruct); 1676 EXPORT_SYMBOL(inet_stream_connect); 1677 EXPORT_SYMBOL(inet_stream_ops); 1678 EXPORT_SYMBOL(inet_unregister_protosw); 1679 EXPORT_SYMBOL(sysctl_ip_nonlocal_bind); 1680