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 <linux/skbuff.h> 109 #include <net/sock.h> 110 #include <net/raw.h> 111 #include <net/icmp.h> 112 #include <net/ipip.h> 113 #include <net/inet_common.h> 114 #include <net/xfrm.h> 115 #include <net/net_namespace.h> 116 #ifdef CONFIG_IP_MROUTE 117 #include <linux/mroute.h> 118 #endif 119 120 121 /* 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 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 pr_err("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 pr_err("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 EXPORT_SYMBOL(inet_sock_destruct); 161 162 /* 163 * The routines beyond this point handle the behaviour of an AF_INET 164 * socket object. Mostly it punts to the subprotocols of IP to do 165 * the work. 166 */ 167 168 /* 169 * Automatically bind an unbound socket. 170 */ 171 172 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->inet_num) { 179 if (sk->sk_prot->get_port(sk, 0)) { 180 release_sock(sk); 181 return -EAGAIN; 182 } 183 inet->inet_sport = htons(inet->inet_num); 184 } 185 release_sock(sk); 186 return 0; 187 } 188 189 /* 190 * Move a socket into listening state. 191 */ 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 EXPORT_SYMBOL(inet_listen); 224 225 u32 inet_ehash_secret __read_mostly; 226 EXPORT_SYMBOL(inet_ehash_secret); 227 228 /* 229 * inet_ehash_secret must be set exactly once 230 * Instead of using a dedicated spinlock, we (ab)use inetsw_lock 231 */ 232 void build_ehash_secret(void) 233 { 234 u32 rnd; 235 do { 236 get_random_bytes(&rnd, sizeof(rnd)); 237 } while (rnd == 0); 238 spin_lock_bh(&inetsw_lock); 239 if (!inet_ehash_secret) 240 inet_ehash_secret = rnd; 241 spin_unlock_bh(&inetsw_lock); 242 } 243 EXPORT_SYMBOL(build_ehash_secret); 244 245 static inline int inet_netns_ok(struct net *net, int protocol) 246 { 247 int hash; 248 const struct net_protocol *ipprot; 249 250 if (net_eq(net, &init_net)) 251 return 1; 252 253 hash = protocol & (MAX_INET_PROTOS - 1); 254 ipprot = rcu_dereference(inet_protos[hash]); 255 256 if (ipprot == NULL) 257 /* raw IP is OK */ 258 return 1; 259 return ipprot->netns_ok; 260 } 261 262 /* 263 * Create an inet socket. 264 */ 265 266 static int inet_create(struct net *net, struct socket *sock, int protocol, 267 int kern) 268 { 269 struct sock *sk; 270 struct inet_protosw *answer; 271 struct inet_sock *inet; 272 struct proto *answer_prot; 273 unsigned char answer_flags; 274 char answer_no_check; 275 int try_loading_module = 0; 276 int err; 277 278 if (unlikely(!inet_ehash_secret)) 279 if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM) 280 build_ehash_secret(); 281 282 sock->state = SS_UNCONNECTED; 283 284 /* Look for the requested type/protocol pair. */ 285 lookup_protocol: 286 err = -ESOCKTNOSUPPORT; 287 rcu_read_lock(); 288 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) { 289 290 err = 0; 291 /* Check the non-wild match. */ 292 if (protocol == answer->protocol) { 293 if (protocol != IPPROTO_IP) 294 break; 295 } else { 296 /* Check for the two wild cases. */ 297 if (IPPROTO_IP == protocol) { 298 protocol = answer->protocol; 299 break; 300 } 301 if (IPPROTO_IP == answer->protocol) 302 break; 303 } 304 err = -EPROTONOSUPPORT; 305 } 306 307 if (unlikely(err)) { 308 if (try_loading_module < 2) { 309 rcu_read_unlock(); 310 /* 311 * Be more specific, e.g. net-pf-2-proto-132-type-1 312 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) 313 */ 314 if (++try_loading_module == 1) 315 request_module("net-pf-%d-proto-%d-type-%d", 316 PF_INET, protocol, sock->type); 317 /* 318 * Fall back to generic, e.g. net-pf-2-proto-132 319 * (net-pf-PF_INET-proto-IPPROTO_SCTP) 320 */ 321 else 322 request_module("net-pf-%d-proto-%d", 323 PF_INET, protocol); 324 goto lookup_protocol; 325 } else 326 goto out_rcu_unlock; 327 } 328 329 err = -EPERM; 330 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW)) 331 goto out_rcu_unlock; 332 333 err = -EAFNOSUPPORT; 334 if (!inet_netns_ok(net, protocol)) 335 goto out_rcu_unlock; 336 337 sock->ops = answer->ops; 338 answer_prot = answer->prot; 339 answer_no_check = answer->no_check; 340 answer_flags = answer->flags; 341 rcu_read_unlock(); 342 343 WARN_ON(answer_prot->slab == NULL); 344 345 err = -ENOBUFS; 346 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot); 347 if (sk == NULL) 348 goto out; 349 350 err = 0; 351 sk->sk_no_check = answer_no_check; 352 if (INET_PROTOSW_REUSE & answer_flags) 353 sk->sk_reuse = 1; 354 355 inet = inet_sk(sk); 356 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 357 358 if (SOCK_RAW == sock->type) { 359 inet->inet_num = protocol; 360 if (IPPROTO_RAW == protocol) 361 inet->hdrincl = 1; 362 } 363 364 if (ipv4_config.no_pmtu_disc) 365 inet->pmtudisc = IP_PMTUDISC_DONT; 366 else 367 inet->pmtudisc = IP_PMTUDISC_WANT; 368 369 inet->inet_id = 0; 370 371 sock_init_data(sock, sk); 372 373 sk->sk_destruct = inet_sock_destruct; 374 sk->sk_protocol = protocol; 375 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 376 377 inet->uc_ttl = -1; 378 inet->mc_loop = 1; 379 inet->mc_ttl = 1; 380 inet->mc_all = 1; 381 inet->mc_index = 0; 382 inet->mc_list = NULL; 383 384 sk_refcnt_debug_inc(sk); 385 386 if (inet->inet_num) { 387 /* It assumes that any protocol which allows 388 * the user to assign a number at socket 389 * creation time automatically 390 * shares. 391 */ 392 inet->inet_sport = htons(inet->inet_num); 393 /* Add to protocol hash chains. */ 394 sk->sk_prot->hash(sk); 395 } 396 397 if (sk->sk_prot->init) { 398 err = sk->sk_prot->init(sk); 399 if (err) 400 sk_common_release(sk); 401 } 402 out: 403 return err; 404 out_rcu_unlock: 405 rcu_read_unlock(); 406 goto out; 407 } 408 409 410 /* 411 * The peer socket should always be NULL (or else). When we call this 412 * function we are destroying the object and from then on nobody 413 * should refer to it. 414 */ 415 int inet_release(struct socket *sock) 416 { 417 struct sock *sk = sock->sk; 418 419 if (sk) { 420 long timeout; 421 422 /* Applications forget to leave groups before exiting */ 423 ip_mc_drop_socket(sk); 424 425 /* If linger is set, we don't return until the close 426 * is complete. Otherwise we return immediately. The 427 * actually closing is done the same either way. 428 * 429 * If the close is due to the process exiting, we never 430 * linger.. 431 */ 432 timeout = 0; 433 if (sock_flag(sk, SOCK_LINGER) && 434 !(current->flags & PF_EXITING)) 435 timeout = sk->sk_lingertime; 436 sock->sk = NULL; 437 sk->sk_prot->close(sk, timeout); 438 } 439 return 0; 440 } 441 EXPORT_SYMBOL(inet_release); 442 443 /* It is off by default, see below. */ 444 int sysctl_ip_nonlocal_bind __read_mostly; 445 EXPORT_SYMBOL(sysctl_ip_nonlocal_bind); 446 447 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 448 { 449 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 450 struct sock *sk = sock->sk; 451 struct inet_sock *inet = inet_sk(sk); 452 unsigned short snum; 453 int chk_addr_ret; 454 int err; 455 456 /* If the socket has its own bind function then use it. (RAW) */ 457 if (sk->sk_prot->bind) { 458 err = sk->sk_prot->bind(sk, uaddr, addr_len); 459 goto out; 460 } 461 err = -EINVAL; 462 if (addr_len < sizeof(struct sockaddr_in)) 463 goto out; 464 465 chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr); 466 467 /* Not specified by any standard per-se, however it breaks too 468 * many applications when removed. It is unfortunate since 469 * allowing applications to make a non-local bind solves 470 * several problems with systems using dynamic addressing. 471 * (ie. your servers still start up even if your ISDN link 472 * is temporarily down) 473 */ 474 err = -EADDRNOTAVAIL; 475 if (!sysctl_ip_nonlocal_bind && 476 !(inet->freebind || inet->transparent) && 477 addr->sin_addr.s_addr != htonl(INADDR_ANY) && 478 chk_addr_ret != RTN_LOCAL && 479 chk_addr_ret != RTN_MULTICAST && 480 chk_addr_ret != RTN_BROADCAST) 481 goto out; 482 483 snum = ntohs(addr->sin_port); 484 err = -EACCES; 485 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) 486 goto out; 487 488 /* We keep a pair of addresses. rcv_saddr is the one 489 * used by hash lookups, and saddr is used for transmit. 490 * 491 * In the BSD API these are the same except where it 492 * would be illegal to use them (multicast/broadcast) in 493 * which case the sending device address is used. 494 */ 495 lock_sock(sk); 496 497 /* Check these errors (active socket, double bind). */ 498 err = -EINVAL; 499 if (sk->sk_state != TCP_CLOSE || inet->inet_num) 500 goto out_release_sock; 501 502 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 503 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 504 inet->inet_saddr = 0; /* Use device */ 505 506 /* Make sure we are allowed to bind here. */ 507 if (sk->sk_prot->get_port(sk, snum)) { 508 inet->inet_saddr = inet->inet_rcv_saddr = 0; 509 err = -EADDRINUSE; 510 goto out_release_sock; 511 } 512 513 if (inet->inet_rcv_saddr) 514 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 515 if (snum) 516 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 517 inet->inet_sport = htons(inet->inet_num); 518 inet->inet_daddr = 0; 519 inet->inet_dport = 0; 520 sk_dst_reset(sk); 521 err = 0; 522 out_release_sock: 523 release_sock(sk); 524 out: 525 return err; 526 } 527 EXPORT_SYMBOL(inet_bind); 528 529 int inet_dgram_connect(struct socket *sock, struct sockaddr * uaddr, 530 int addr_len, int flags) 531 { 532 struct sock *sk = sock->sk; 533 534 if (addr_len < sizeof(uaddr->sa_family)) 535 return -EINVAL; 536 if (uaddr->sa_family == AF_UNSPEC) 537 return sk->sk_prot->disconnect(sk, flags); 538 539 if (!inet_sk(sk)->inet_num && inet_autobind(sk)) 540 return -EAGAIN; 541 return sk->sk_prot->connect(sk, (struct sockaddr *)uaddr, addr_len); 542 } 543 EXPORT_SYMBOL(inet_dgram_connect); 544 545 static long inet_wait_for_connect(struct sock *sk, long timeo) 546 { 547 DEFINE_WAIT(wait); 548 549 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 550 551 /* Basic assumption: if someone sets sk->sk_err, he _must_ 552 * change state of the socket from TCP_SYN_*. 553 * Connect() does not allow to get error notifications 554 * without closing the socket. 555 */ 556 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 557 release_sock(sk); 558 timeo = schedule_timeout(timeo); 559 lock_sock(sk); 560 if (signal_pending(current) || !timeo) 561 break; 562 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 563 } 564 finish_wait(sk->sk_sleep, &wait); 565 return timeo; 566 } 567 568 /* 569 * Connect to a remote host. There is regrettably still a little 570 * TCP 'magic' in here. 571 */ 572 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 573 int addr_len, int flags) 574 { 575 struct sock *sk = sock->sk; 576 int err; 577 long timeo; 578 579 if (addr_len < sizeof(uaddr->sa_family)) 580 return -EINVAL; 581 582 lock_sock(sk); 583 584 if (uaddr->sa_family == AF_UNSPEC) { 585 err = sk->sk_prot->disconnect(sk, flags); 586 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 587 goto out; 588 } 589 590 switch (sock->state) { 591 default: 592 err = -EINVAL; 593 goto out; 594 case SS_CONNECTED: 595 err = -EISCONN; 596 goto out; 597 case SS_CONNECTING: 598 err = -EALREADY; 599 /* Fall out of switch with err, set for this state */ 600 break; 601 case SS_UNCONNECTED: 602 err = -EISCONN; 603 if (sk->sk_state != TCP_CLOSE) 604 goto out; 605 606 err = sk->sk_prot->connect(sk, uaddr, addr_len); 607 if (err < 0) 608 goto out; 609 610 sock->state = SS_CONNECTING; 611 612 /* Just entered SS_CONNECTING state; the only 613 * difference is that return value in non-blocking 614 * case is EINPROGRESS, rather than EALREADY. 615 */ 616 err = -EINPROGRESS; 617 break; 618 } 619 620 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 621 622 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 623 /* Error code is set above */ 624 if (!timeo || !inet_wait_for_connect(sk, timeo)) 625 goto out; 626 627 err = sock_intr_errno(timeo); 628 if (signal_pending(current)) 629 goto out; 630 } 631 632 /* Connection was closed by RST, timeout, ICMP error 633 * or another process disconnected us. 634 */ 635 if (sk->sk_state == TCP_CLOSE) 636 goto sock_error; 637 638 /* sk->sk_err may be not zero now, if RECVERR was ordered by user 639 * and error was received after socket entered established state. 640 * Hence, it is handled normally after connect() return successfully. 641 */ 642 643 sock->state = SS_CONNECTED; 644 err = 0; 645 out: 646 release_sock(sk); 647 return err; 648 649 sock_error: 650 err = sock_error(sk) ? : -ECONNABORTED; 651 sock->state = SS_UNCONNECTED; 652 if (sk->sk_prot->disconnect(sk, flags)) 653 sock->state = SS_DISCONNECTING; 654 goto out; 655 } 656 EXPORT_SYMBOL(inet_stream_connect); 657 658 /* 659 * Accept a pending connection. The TCP layer now gives BSD semantics. 660 */ 661 662 int inet_accept(struct socket *sock, struct socket *newsock, int flags) 663 { 664 struct sock *sk1 = sock->sk; 665 int err = -EINVAL; 666 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err); 667 668 if (!sk2) 669 goto do_err; 670 671 lock_sock(sk2); 672 673 WARN_ON(!((1 << sk2->sk_state) & 674 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE))); 675 676 sock_graft(sk2, newsock); 677 678 newsock->state = SS_CONNECTED; 679 err = 0; 680 release_sock(sk2); 681 do_err: 682 return err; 683 } 684 EXPORT_SYMBOL(inet_accept); 685 686 687 /* 688 * This does both peername and sockname. 689 */ 690 int inet_getname(struct socket *sock, struct sockaddr *uaddr, 691 int *uaddr_len, int peer) 692 { 693 struct sock *sk = sock->sk; 694 struct inet_sock *inet = inet_sk(sk); 695 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr); 696 697 sin->sin_family = AF_INET; 698 if (peer) { 699 if (!inet->inet_dport || 700 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 701 peer == 1)) 702 return -ENOTCONN; 703 sin->sin_port = inet->inet_dport; 704 sin->sin_addr.s_addr = inet->inet_daddr; 705 } else { 706 __be32 addr = inet->inet_rcv_saddr; 707 if (!addr) 708 addr = inet->inet_saddr; 709 sin->sin_port = inet->inet_sport; 710 sin->sin_addr.s_addr = addr; 711 } 712 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 713 *uaddr_len = sizeof(*sin); 714 return 0; 715 } 716 EXPORT_SYMBOL(inet_getname); 717 718 int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 719 size_t size) 720 { 721 struct sock *sk = sock->sk; 722 723 /* We may need to bind the socket. */ 724 if (!inet_sk(sk)->inet_num && inet_autobind(sk)) 725 return -EAGAIN; 726 727 return sk->sk_prot->sendmsg(iocb, sk, msg, size); 728 } 729 EXPORT_SYMBOL(inet_sendmsg); 730 731 732 static ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, 733 size_t size, int flags) 734 { 735 struct sock *sk = sock->sk; 736 737 /* We may need to bind the socket. */ 738 if (!inet_sk(sk)->inet_num && inet_autobind(sk)) 739 return -EAGAIN; 740 741 if (sk->sk_prot->sendpage) 742 return sk->sk_prot->sendpage(sk, page, offset, size, flags); 743 return sock_no_sendpage(sock, page, offset, size, flags); 744 } 745 746 747 int inet_shutdown(struct socket *sock, int how) 748 { 749 struct sock *sk = sock->sk; 750 int err = 0; 751 752 /* This should really check to make sure 753 * the socket is a TCP socket. (WHY AC...) 754 */ 755 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and 756 1->2 bit 2 snds. 757 2->3 */ 758 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ 759 return -EINVAL; 760 761 lock_sock(sk); 762 if (sock->state == SS_CONNECTING) { 763 if ((1 << sk->sk_state) & 764 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) 765 sock->state = SS_DISCONNECTING; 766 else 767 sock->state = SS_CONNECTED; 768 } 769 770 switch (sk->sk_state) { 771 case TCP_CLOSE: 772 err = -ENOTCONN; 773 /* Hack to wake up other listeners, who can poll for 774 POLLHUP, even on eg. unconnected UDP sockets -- RR */ 775 default: 776 sk->sk_shutdown |= how; 777 if (sk->sk_prot->shutdown) 778 sk->sk_prot->shutdown(sk, how); 779 break; 780 781 /* Remaining two branches are temporary solution for missing 782 * close() in multithreaded environment. It is _not_ a good idea, 783 * but we have no choice until close() is repaired at VFS level. 784 */ 785 case TCP_LISTEN: 786 if (!(how & RCV_SHUTDOWN)) 787 break; 788 /* Fall through */ 789 case TCP_SYN_SENT: 790 err = sk->sk_prot->disconnect(sk, O_NONBLOCK); 791 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 792 break; 793 } 794 795 /* Wake up anyone sleeping in poll. */ 796 sk->sk_state_change(sk); 797 release_sock(sk); 798 return err; 799 } 800 EXPORT_SYMBOL(inet_shutdown); 801 802 /* 803 * ioctl() calls you can issue on an INET socket. Most of these are 804 * device configuration and stuff and very rarely used. Some ioctls 805 * pass on to the socket itself. 806 * 807 * NOTE: I like the idea of a module for the config stuff. ie ifconfig 808 * loads the devconfigure module does its configuring and unloads it. 809 * There's a good 20K of config code hanging around the kernel. 810 */ 811 812 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 813 { 814 struct sock *sk = sock->sk; 815 int err = 0; 816 struct net *net = sock_net(sk); 817 818 switch (cmd) { 819 case SIOCGSTAMP: 820 err = sock_get_timestamp(sk, (struct timeval __user *)arg); 821 break; 822 case SIOCGSTAMPNS: 823 err = sock_get_timestampns(sk, (struct timespec __user *)arg); 824 break; 825 case SIOCADDRT: 826 case SIOCDELRT: 827 case SIOCRTMSG: 828 err = ip_rt_ioctl(net, cmd, (void __user *)arg); 829 break; 830 case SIOCDARP: 831 case SIOCGARP: 832 case SIOCSARP: 833 err = arp_ioctl(net, cmd, (void __user *)arg); 834 break; 835 case SIOCGIFADDR: 836 case SIOCSIFADDR: 837 case SIOCGIFBRDADDR: 838 case SIOCSIFBRDADDR: 839 case SIOCGIFNETMASK: 840 case SIOCSIFNETMASK: 841 case SIOCGIFDSTADDR: 842 case SIOCSIFDSTADDR: 843 case SIOCSIFPFLAGS: 844 case SIOCGIFPFLAGS: 845 case SIOCSIFFLAGS: 846 err = devinet_ioctl(net, cmd, (void __user *)arg); 847 break; 848 default: 849 if (sk->sk_prot->ioctl) 850 err = sk->sk_prot->ioctl(sk, cmd, arg); 851 else 852 err = -ENOIOCTLCMD; 853 break; 854 } 855 return err; 856 } 857 EXPORT_SYMBOL(inet_ioctl); 858 859 const struct proto_ops inet_stream_ops = { 860 .family = PF_INET, 861 .owner = THIS_MODULE, 862 .release = inet_release, 863 .bind = inet_bind, 864 .connect = inet_stream_connect, 865 .socketpair = sock_no_socketpair, 866 .accept = inet_accept, 867 .getname = inet_getname, 868 .poll = tcp_poll, 869 .ioctl = inet_ioctl, 870 .listen = inet_listen, 871 .shutdown = inet_shutdown, 872 .setsockopt = sock_common_setsockopt, 873 .getsockopt = sock_common_getsockopt, 874 .sendmsg = tcp_sendmsg, 875 .recvmsg = sock_common_recvmsg, 876 .mmap = sock_no_mmap, 877 .sendpage = tcp_sendpage, 878 .splice_read = tcp_splice_read, 879 #ifdef CONFIG_COMPAT 880 .compat_setsockopt = compat_sock_common_setsockopt, 881 .compat_getsockopt = compat_sock_common_getsockopt, 882 #endif 883 }; 884 EXPORT_SYMBOL(inet_stream_ops); 885 886 const struct proto_ops inet_dgram_ops = { 887 .family = PF_INET, 888 .owner = THIS_MODULE, 889 .release = inet_release, 890 .bind = inet_bind, 891 .connect = inet_dgram_connect, 892 .socketpair = sock_no_socketpair, 893 .accept = sock_no_accept, 894 .getname = inet_getname, 895 .poll = udp_poll, 896 .ioctl = inet_ioctl, 897 .listen = sock_no_listen, 898 .shutdown = inet_shutdown, 899 .setsockopt = sock_common_setsockopt, 900 .getsockopt = sock_common_getsockopt, 901 .sendmsg = inet_sendmsg, 902 .recvmsg = sock_common_recvmsg, 903 .mmap = sock_no_mmap, 904 .sendpage = inet_sendpage, 905 #ifdef CONFIG_COMPAT 906 .compat_setsockopt = compat_sock_common_setsockopt, 907 .compat_getsockopt = compat_sock_common_getsockopt, 908 #endif 909 }; 910 EXPORT_SYMBOL(inet_dgram_ops); 911 912 /* 913 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 914 * udp_poll 915 */ 916 static const struct proto_ops inet_sockraw_ops = { 917 .family = PF_INET, 918 .owner = THIS_MODULE, 919 .release = inet_release, 920 .bind = inet_bind, 921 .connect = inet_dgram_connect, 922 .socketpair = sock_no_socketpair, 923 .accept = sock_no_accept, 924 .getname = inet_getname, 925 .poll = datagram_poll, 926 .ioctl = inet_ioctl, 927 .listen = sock_no_listen, 928 .shutdown = inet_shutdown, 929 .setsockopt = sock_common_setsockopt, 930 .getsockopt = sock_common_getsockopt, 931 .sendmsg = inet_sendmsg, 932 .recvmsg = sock_common_recvmsg, 933 .mmap = sock_no_mmap, 934 .sendpage = inet_sendpage, 935 #ifdef CONFIG_COMPAT 936 .compat_setsockopt = compat_sock_common_setsockopt, 937 .compat_getsockopt = compat_sock_common_getsockopt, 938 #endif 939 }; 940 941 static const struct net_proto_family inet_family_ops = { 942 .family = PF_INET, 943 .create = inet_create, 944 .owner = THIS_MODULE, 945 }; 946 947 /* Upon startup we insert all the elements in inetsw_array[] into 948 * the linked list inetsw. 949 */ 950 static struct inet_protosw inetsw_array[] = 951 { 952 { 953 .type = SOCK_STREAM, 954 .protocol = IPPROTO_TCP, 955 .prot = &tcp_prot, 956 .ops = &inet_stream_ops, 957 .no_check = 0, 958 .flags = INET_PROTOSW_PERMANENT | 959 INET_PROTOSW_ICSK, 960 }, 961 962 { 963 .type = SOCK_DGRAM, 964 .protocol = IPPROTO_UDP, 965 .prot = &udp_prot, 966 .ops = &inet_dgram_ops, 967 .no_check = UDP_CSUM_DEFAULT, 968 .flags = INET_PROTOSW_PERMANENT, 969 }, 970 971 972 { 973 .type = SOCK_RAW, 974 .protocol = IPPROTO_IP, /* wild card */ 975 .prot = &raw_prot, 976 .ops = &inet_sockraw_ops, 977 .no_check = UDP_CSUM_DEFAULT, 978 .flags = INET_PROTOSW_REUSE, 979 } 980 }; 981 982 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) 983 984 void inet_register_protosw(struct inet_protosw *p) 985 { 986 struct list_head *lh; 987 struct inet_protosw *answer; 988 int protocol = p->protocol; 989 struct list_head *last_perm; 990 991 spin_lock_bh(&inetsw_lock); 992 993 if (p->type >= SOCK_MAX) 994 goto out_illegal; 995 996 /* If we are trying to override a permanent protocol, bail. */ 997 answer = NULL; 998 last_perm = &inetsw[p->type]; 999 list_for_each(lh, &inetsw[p->type]) { 1000 answer = list_entry(lh, struct inet_protosw, list); 1001 1002 /* Check only the non-wild match. */ 1003 if (INET_PROTOSW_PERMANENT & answer->flags) { 1004 if (protocol == answer->protocol) 1005 break; 1006 last_perm = lh; 1007 } 1008 1009 answer = NULL; 1010 } 1011 if (answer) 1012 goto out_permanent; 1013 1014 /* Add the new entry after the last permanent entry if any, so that 1015 * the new entry does not override a permanent entry when matched with 1016 * a wild-card protocol. But it is allowed to override any existing 1017 * non-permanent entry. This means that when we remove this entry, the 1018 * system automatically returns to the old behavior. 1019 */ 1020 list_add_rcu(&p->list, last_perm); 1021 out: 1022 spin_unlock_bh(&inetsw_lock); 1023 1024 return; 1025 1026 out_permanent: 1027 printk(KERN_ERR "Attempt to override permanent protocol %d.\n", 1028 protocol); 1029 goto out; 1030 1031 out_illegal: 1032 printk(KERN_ERR 1033 "Ignoring attempt to register invalid socket type %d.\n", 1034 p->type); 1035 goto out; 1036 } 1037 EXPORT_SYMBOL(inet_register_protosw); 1038 1039 void inet_unregister_protosw(struct inet_protosw *p) 1040 { 1041 if (INET_PROTOSW_PERMANENT & p->flags) { 1042 printk(KERN_ERR 1043 "Attempt to unregister permanent protocol %d.\n", 1044 p->protocol); 1045 } else { 1046 spin_lock_bh(&inetsw_lock); 1047 list_del_rcu(&p->list); 1048 spin_unlock_bh(&inetsw_lock); 1049 1050 synchronize_net(); 1051 } 1052 } 1053 EXPORT_SYMBOL(inet_unregister_protosw); 1054 1055 /* 1056 * Shall we try to damage output packets if routing dev changes? 1057 */ 1058 1059 int sysctl_ip_dynaddr __read_mostly; 1060 1061 static int inet_sk_reselect_saddr(struct sock *sk) 1062 { 1063 struct inet_sock *inet = inet_sk(sk); 1064 int err; 1065 struct rtable *rt; 1066 __be32 old_saddr = inet->inet_saddr; 1067 __be32 new_saddr; 1068 __be32 daddr = inet->inet_daddr; 1069 1070 if (inet->opt && inet->opt->srr) 1071 daddr = inet->opt->faddr; 1072 1073 /* Query new route. */ 1074 err = ip_route_connect(&rt, daddr, 0, 1075 RT_CONN_FLAGS(sk), 1076 sk->sk_bound_dev_if, 1077 sk->sk_protocol, 1078 inet->inet_sport, inet->inet_dport, sk, 0); 1079 if (err) 1080 return err; 1081 1082 sk_setup_caps(sk, &rt->u.dst); 1083 1084 new_saddr = rt->rt_src; 1085 1086 if (new_saddr == old_saddr) 1087 return 0; 1088 1089 if (sysctl_ip_dynaddr > 1) { 1090 printk(KERN_INFO "%s(): shifting inet->saddr from %pI4 to %pI4\n", 1091 __func__, &old_saddr, &new_saddr); 1092 } 1093 1094 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr; 1095 1096 /* 1097 * XXX The only one ugly spot where we need to 1098 * XXX really change the sockets identity after 1099 * XXX it has entered the hashes. -DaveM 1100 * 1101 * Besides that, it does not check for connection 1102 * uniqueness. Wait for troubles. 1103 */ 1104 __sk_prot_rehash(sk); 1105 return 0; 1106 } 1107 1108 int inet_sk_rebuild_header(struct sock *sk) 1109 { 1110 struct inet_sock *inet = inet_sk(sk); 1111 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); 1112 __be32 daddr; 1113 int err; 1114 1115 /* Route is OK, nothing to do. */ 1116 if (rt) 1117 return 0; 1118 1119 /* Reroute. */ 1120 daddr = inet->inet_daddr; 1121 if (inet->opt && inet->opt->srr) 1122 daddr = inet->opt->faddr; 1123 { 1124 struct flowi fl = { 1125 .oif = sk->sk_bound_dev_if, 1126 .mark = sk->sk_mark, 1127 .nl_u = { 1128 .ip4_u = { 1129 .daddr = daddr, 1130 .saddr = inet->inet_saddr, 1131 .tos = RT_CONN_FLAGS(sk), 1132 }, 1133 }, 1134 .proto = sk->sk_protocol, 1135 .flags = inet_sk_flowi_flags(sk), 1136 .uli_u = { 1137 .ports = { 1138 .sport = inet->inet_sport, 1139 .dport = inet->inet_dport, 1140 }, 1141 }, 1142 }; 1143 1144 security_sk_classify_flow(sk, &fl); 1145 err = ip_route_output_flow(sock_net(sk), &rt, &fl, sk, 0); 1146 } 1147 if (!err) 1148 sk_setup_caps(sk, &rt->u.dst); 1149 else { 1150 /* Routing failed... */ 1151 sk->sk_route_caps = 0; 1152 /* 1153 * Other protocols have to map its equivalent state to TCP_SYN_SENT. 1154 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme 1155 */ 1156 if (!sysctl_ip_dynaddr || 1157 sk->sk_state != TCP_SYN_SENT || 1158 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 1159 (err = inet_sk_reselect_saddr(sk)) != 0) 1160 sk->sk_err_soft = -err; 1161 } 1162 1163 return err; 1164 } 1165 EXPORT_SYMBOL(inet_sk_rebuild_header); 1166 1167 static int inet_gso_send_check(struct sk_buff *skb) 1168 { 1169 struct iphdr *iph; 1170 const struct net_protocol *ops; 1171 int proto; 1172 int ihl; 1173 int err = -EINVAL; 1174 1175 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1176 goto out; 1177 1178 iph = ip_hdr(skb); 1179 ihl = iph->ihl * 4; 1180 if (ihl < sizeof(*iph)) 1181 goto out; 1182 1183 if (unlikely(!pskb_may_pull(skb, ihl))) 1184 goto out; 1185 1186 __skb_pull(skb, ihl); 1187 skb_reset_transport_header(skb); 1188 iph = ip_hdr(skb); 1189 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1190 err = -EPROTONOSUPPORT; 1191 1192 rcu_read_lock(); 1193 ops = rcu_dereference(inet_protos[proto]); 1194 if (likely(ops && ops->gso_send_check)) 1195 err = ops->gso_send_check(skb); 1196 rcu_read_unlock(); 1197 1198 out: 1199 return err; 1200 } 1201 1202 static struct sk_buff *inet_gso_segment(struct sk_buff *skb, int features) 1203 { 1204 struct sk_buff *segs = ERR_PTR(-EINVAL); 1205 struct iphdr *iph; 1206 const struct net_protocol *ops; 1207 int proto; 1208 int ihl; 1209 int id; 1210 unsigned int offset = 0; 1211 1212 if (!(features & NETIF_F_V4_CSUM)) 1213 features &= ~NETIF_F_SG; 1214 1215 if (unlikely(skb_shinfo(skb)->gso_type & 1216 ~(SKB_GSO_TCPV4 | 1217 SKB_GSO_UDP | 1218 SKB_GSO_DODGY | 1219 SKB_GSO_TCP_ECN | 1220 0))) 1221 goto out; 1222 1223 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1224 goto out; 1225 1226 iph = ip_hdr(skb); 1227 ihl = iph->ihl * 4; 1228 if (ihl < sizeof(*iph)) 1229 goto out; 1230 1231 if (unlikely(!pskb_may_pull(skb, ihl))) 1232 goto out; 1233 1234 __skb_pull(skb, ihl); 1235 skb_reset_transport_header(skb); 1236 iph = ip_hdr(skb); 1237 id = ntohs(iph->id); 1238 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1239 segs = ERR_PTR(-EPROTONOSUPPORT); 1240 1241 rcu_read_lock(); 1242 ops = rcu_dereference(inet_protos[proto]); 1243 if (likely(ops && ops->gso_segment)) 1244 segs = ops->gso_segment(skb, features); 1245 rcu_read_unlock(); 1246 1247 if (!segs || IS_ERR(segs)) 1248 goto out; 1249 1250 skb = segs; 1251 do { 1252 iph = ip_hdr(skb); 1253 if (proto == IPPROTO_UDP) { 1254 iph->id = htons(id); 1255 iph->frag_off = htons(offset >> 3); 1256 if (skb->next != NULL) 1257 iph->frag_off |= htons(IP_MF); 1258 offset += (skb->len - skb->mac_len - iph->ihl * 4); 1259 } else 1260 iph->id = htons(id++); 1261 iph->tot_len = htons(skb->len - skb->mac_len); 1262 iph->check = 0; 1263 iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl); 1264 } while ((skb = skb->next)); 1265 1266 out: 1267 return segs; 1268 } 1269 1270 static struct sk_buff **inet_gro_receive(struct sk_buff **head, 1271 struct sk_buff *skb) 1272 { 1273 const struct net_protocol *ops; 1274 struct sk_buff **pp = NULL; 1275 struct sk_buff *p; 1276 struct iphdr *iph; 1277 unsigned int hlen; 1278 unsigned int off; 1279 unsigned int id; 1280 int flush = 1; 1281 int proto; 1282 1283 off = skb_gro_offset(skb); 1284 hlen = off + sizeof(*iph); 1285 iph = skb_gro_header_fast(skb, off); 1286 if (skb_gro_header_hard(skb, hlen)) { 1287 iph = skb_gro_header_slow(skb, hlen, off); 1288 if (unlikely(!iph)) 1289 goto out; 1290 } 1291 1292 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1293 1294 rcu_read_lock(); 1295 ops = rcu_dereference(inet_protos[proto]); 1296 if (!ops || !ops->gro_receive) 1297 goto out_unlock; 1298 1299 if (*(u8 *)iph != 0x45) 1300 goto out_unlock; 1301 1302 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) 1303 goto out_unlock; 1304 1305 id = ntohl(*(u32 *)&iph->id); 1306 flush = (u16)((ntohl(*(u32 *)iph) ^ skb_gro_len(skb)) | (id ^ IP_DF)); 1307 id >>= 16; 1308 1309 for (p = *head; p; p = p->next) { 1310 struct iphdr *iph2; 1311 1312 if (!NAPI_GRO_CB(p)->same_flow) 1313 continue; 1314 1315 iph2 = ip_hdr(p); 1316 1317 if ((iph->protocol ^ iph2->protocol) | 1318 (iph->tos ^ iph2->tos) | 1319 (iph->saddr ^ iph2->saddr) | 1320 (iph->daddr ^ iph2->daddr)) { 1321 NAPI_GRO_CB(p)->same_flow = 0; 1322 continue; 1323 } 1324 1325 /* All fields must match except length and checksum. */ 1326 NAPI_GRO_CB(p)->flush |= 1327 (iph->ttl ^ iph2->ttl) | 1328 ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id); 1329 1330 NAPI_GRO_CB(p)->flush |= flush; 1331 } 1332 1333 NAPI_GRO_CB(skb)->flush |= flush; 1334 skb_gro_pull(skb, sizeof(*iph)); 1335 skb_set_transport_header(skb, skb_gro_offset(skb)); 1336 1337 pp = ops->gro_receive(head, skb); 1338 1339 out_unlock: 1340 rcu_read_unlock(); 1341 1342 out: 1343 NAPI_GRO_CB(skb)->flush |= flush; 1344 1345 return pp; 1346 } 1347 1348 static int inet_gro_complete(struct sk_buff *skb) 1349 { 1350 const struct net_protocol *ops; 1351 struct iphdr *iph = ip_hdr(skb); 1352 int proto = iph->protocol & (MAX_INET_PROTOS - 1); 1353 int err = -ENOSYS; 1354 __be16 newlen = htons(skb->len - skb_network_offset(skb)); 1355 1356 csum_replace2(&iph->check, iph->tot_len, newlen); 1357 iph->tot_len = newlen; 1358 1359 rcu_read_lock(); 1360 ops = rcu_dereference(inet_protos[proto]); 1361 if (WARN_ON(!ops || !ops->gro_complete)) 1362 goto out_unlock; 1363 1364 err = ops->gro_complete(skb); 1365 1366 out_unlock: 1367 rcu_read_unlock(); 1368 1369 return err; 1370 } 1371 1372 int inet_ctl_sock_create(struct sock **sk, unsigned short family, 1373 unsigned short type, unsigned char protocol, 1374 struct net *net) 1375 { 1376 struct socket *sock; 1377 int rc = sock_create_kern(family, type, protocol, &sock); 1378 1379 if (rc == 0) { 1380 *sk = sock->sk; 1381 (*sk)->sk_allocation = GFP_ATOMIC; 1382 /* 1383 * Unhash it so that IP input processing does not even see it, 1384 * we do not wish this socket to see incoming packets. 1385 */ 1386 (*sk)->sk_prot->unhash(*sk); 1387 1388 sk_change_net(*sk, net); 1389 } 1390 return rc; 1391 } 1392 EXPORT_SYMBOL_GPL(inet_ctl_sock_create); 1393 1394 unsigned long snmp_fold_field(void __percpu *mib[], int offt) 1395 { 1396 unsigned long res = 0; 1397 int i; 1398 1399 for_each_possible_cpu(i) { 1400 res += *(((unsigned long *) per_cpu_ptr(mib[0], i)) + offt); 1401 res += *(((unsigned long *) per_cpu_ptr(mib[1], i)) + offt); 1402 } 1403 return res; 1404 } 1405 EXPORT_SYMBOL_GPL(snmp_fold_field); 1406 1407 int snmp_mib_init(void __percpu *ptr[2], size_t mibsize) 1408 { 1409 BUG_ON(ptr == NULL); 1410 ptr[0] = __alloc_percpu(mibsize, __alignof__(unsigned long long)); 1411 if (!ptr[0]) 1412 goto err0; 1413 ptr[1] = __alloc_percpu(mibsize, __alignof__(unsigned long long)); 1414 if (!ptr[1]) 1415 goto err1; 1416 return 0; 1417 err1: 1418 free_percpu(ptr[0]); 1419 ptr[0] = NULL; 1420 err0: 1421 return -ENOMEM; 1422 } 1423 EXPORT_SYMBOL_GPL(snmp_mib_init); 1424 1425 void snmp_mib_free(void __percpu *ptr[2]) 1426 { 1427 BUG_ON(ptr == NULL); 1428 free_percpu(ptr[0]); 1429 free_percpu(ptr[1]); 1430 ptr[0] = ptr[1] = NULL; 1431 } 1432 EXPORT_SYMBOL_GPL(snmp_mib_free); 1433 1434 #ifdef CONFIG_IP_MULTICAST 1435 static const struct net_protocol igmp_protocol = { 1436 .handler = igmp_rcv, 1437 .netns_ok = 1, 1438 }; 1439 #endif 1440 1441 static const struct net_protocol tcp_protocol = { 1442 .handler = tcp_v4_rcv, 1443 .err_handler = tcp_v4_err, 1444 .gso_send_check = tcp_v4_gso_send_check, 1445 .gso_segment = tcp_tso_segment, 1446 .gro_receive = tcp4_gro_receive, 1447 .gro_complete = tcp4_gro_complete, 1448 .no_policy = 1, 1449 .netns_ok = 1, 1450 }; 1451 1452 static const struct net_protocol udp_protocol = { 1453 .handler = udp_rcv, 1454 .err_handler = udp_err, 1455 .gso_send_check = udp4_ufo_send_check, 1456 .gso_segment = udp4_ufo_fragment, 1457 .no_policy = 1, 1458 .netns_ok = 1, 1459 }; 1460 1461 static const struct net_protocol icmp_protocol = { 1462 .handler = icmp_rcv, 1463 .no_policy = 1, 1464 .netns_ok = 1, 1465 }; 1466 1467 static __net_init int ipv4_mib_init_net(struct net *net) 1468 { 1469 if (snmp_mib_init((void __percpu **)net->mib.tcp_statistics, 1470 sizeof(struct tcp_mib)) < 0) 1471 goto err_tcp_mib; 1472 if (snmp_mib_init((void __percpu **)net->mib.ip_statistics, 1473 sizeof(struct ipstats_mib)) < 0) 1474 goto err_ip_mib; 1475 if (snmp_mib_init((void __percpu **)net->mib.net_statistics, 1476 sizeof(struct linux_mib)) < 0) 1477 goto err_net_mib; 1478 if (snmp_mib_init((void __percpu **)net->mib.udp_statistics, 1479 sizeof(struct udp_mib)) < 0) 1480 goto err_udp_mib; 1481 if (snmp_mib_init((void __percpu **)net->mib.udplite_statistics, 1482 sizeof(struct udp_mib)) < 0) 1483 goto err_udplite_mib; 1484 if (snmp_mib_init((void __percpu **)net->mib.icmp_statistics, 1485 sizeof(struct icmp_mib)) < 0) 1486 goto err_icmp_mib; 1487 if (snmp_mib_init((void __percpu **)net->mib.icmpmsg_statistics, 1488 sizeof(struct icmpmsg_mib)) < 0) 1489 goto err_icmpmsg_mib; 1490 1491 tcp_mib_init(net); 1492 return 0; 1493 1494 err_icmpmsg_mib: 1495 snmp_mib_free((void __percpu **)net->mib.icmp_statistics); 1496 err_icmp_mib: 1497 snmp_mib_free((void __percpu **)net->mib.udplite_statistics); 1498 err_udplite_mib: 1499 snmp_mib_free((void __percpu **)net->mib.udp_statistics); 1500 err_udp_mib: 1501 snmp_mib_free((void __percpu **)net->mib.net_statistics); 1502 err_net_mib: 1503 snmp_mib_free((void __percpu **)net->mib.ip_statistics); 1504 err_ip_mib: 1505 snmp_mib_free((void __percpu **)net->mib.tcp_statistics); 1506 err_tcp_mib: 1507 return -ENOMEM; 1508 } 1509 1510 static __net_exit void ipv4_mib_exit_net(struct net *net) 1511 { 1512 snmp_mib_free((void __percpu **)net->mib.icmpmsg_statistics); 1513 snmp_mib_free((void __percpu **)net->mib.icmp_statistics); 1514 snmp_mib_free((void __percpu **)net->mib.udplite_statistics); 1515 snmp_mib_free((void __percpu **)net->mib.udp_statistics); 1516 snmp_mib_free((void __percpu **)net->mib.net_statistics); 1517 snmp_mib_free((void __percpu **)net->mib.ip_statistics); 1518 snmp_mib_free((void __percpu **)net->mib.tcp_statistics); 1519 } 1520 1521 static __net_initdata struct pernet_operations ipv4_mib_ops = { 1522 .init = ipv4_mib_init_net, 1523 .exit = ipv4_mib_exit_net, 1524 }; 1525 1526 static int __init init_ipv4_mibs(void) 1527 { 1528 return register_pernet_subsys(&ipv4_mib_ops); 1529 } 1530 1531 static int ipv4_proc_init(void); 1532 1533 /* 1534 * IP protocol layer initialiser 1535 */ 1536 1537 static struct packet_type ip_packet_type __read_mostly = { 1538 .type = cpu_to_be16(ETH_P_IP), 1539 .func = ip_rcv, 1540 .gso_send_check = inet_gso_send_check, 1541 .gso_segment = inet_gso_segment, 1542 .gro_receive = inet_gro_receive, 1543 .gro_complete = inet_gro_complete, 1544 }; 1545 1546 static int __init inet_init(void) 1547 { 1548 struct sk_buff *dummy_skb; 1549 struct inet_protosw *q; 1550 struct list_head *r; 1551 int rc = -EINVAL; 1552 1553 BUILD_BUG_ON(sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb)); 1554 1555 rc = proto_register(&tcp_prot, 1); 1556 if (rc) 1557 goto out; 1558 1559 rc = proto_register(&udp_prot, 1); 1560 if (rc) 1561 goto out_unregister_tcp_proto; 1562 1563 rc = proto_register(&raw_prot, 1); 1564 if (rc) 1565 goto out_unregister_udp_proto; 1566 1567 /* 1568 * Tell SOCKET that we are alive... 1569 */ 1570 1571 (void)sock_register(&inet_family_ops); 1572 1573 #ifdef CONFIG_SYSCTL 1574 ip_static_sysctl_init(); 1575 #endif 1576 1577 /* 1578 * Add all the base protocols. 1579 */ 1580 1581 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 1582 printk(KERN_CRIT "inet_init: Cannot add ICMP protocol\n"); 1583 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) 1584 printk(KERN_CRIT "inet_init: Cannot add UDP protocol\n"); 1585 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) 1586 printk(KERN_CRIT "inet_init: Cannot add TCP protocol\n"); 1587 #ifdef CONFIG_IP_MULTICAST 1588 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 1589 printk(KERN_CRIT "inet_init: Cannot add IGMP protocol\n"); 1590 #endif 1591 1592 /* Register the socket-side information for inet_create. */ 1593 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 1594 INIT_LIST_HEAD(r); 1595 1596 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 1597 inet_register_protosw(q); 1598 1599 /* 1600 * Set the ARP module up 1601 */ 1602 1603 arp_init(); 1604 1605 /* 1606 * Set the IP module up 1607 */ 1608 1609 ip_init(); 1610 1611 tcp_v4_init(); 1612 1613 /* Setup TCP slab cache for open requests. */ 1614 tcp_init(); 1615 1616 /* Setup UDP memory threshold */ 1617 udp_init(); 1618 1619 /* Add UDP-Lite (RFC 3828) */ 1620 udplite4_register(); 1621 1622 /* 1623 * Set the ICMP layer up 1624 */ 1625 1626 if (icmp_init() < 0) 1627 panic("Failed to create the ICMP control socket.\n"); 1628 1629 /* 1630 * Initialise the multicast router 1631 */ 1632 #if defined(CONFIG_IP_MROUTE) 1633 if (ip_mr_init()) 1634 printk(KERN_CRIT "inet_init: Cannot init ipv4 mroute\n"); 1635 #endif 1636 /* 1637 * Initialise per-cpu ipv4 mibs 1638 */ 1639 1640 if (init_ipv4_mibs()) 1641 printk(KERN_CRIT "inet_init: Cannot init ipv4 mibs\n"); 1642 1643 ipv4_proc_init(); 1644 1645 ipfrag_init(); 1646 1647 dev_add_pack(&ip_packet_type); 1648 1649 rc = 0; 1650 out: 1651 return rc; 1652 out_unregister_udp_proto: 1653 proto_unregister(&udp_prot); 1654 out_unregister_tcp_proto: 1655 proto_unregister(&tcp_prot); 1656 goto out; 1657 } 1658 1659 fs_initcall(inet_init); 1660 1661 /* ------------------------------------------------------------------------ */ 1662 1663 #ifdef CONFIG_PROC_FS 1664 static int __init ipv4_proc_init(void) 1665 { 1666 int rc = 0; 1667 1668 if (raw_proc_init()) 1669 goto out_raw; 1670 if (tcp4_proc_init()) 1671 goto out_tcp; 1672 if (udp4_proc_init()) 1673 goto out_udp; 1674 if (ip_misc_proc_init()) 1675 goto out_misc; 1676 out: 1677 return rc; 1678 out_misc: 1679 udp4_proc_exit(); 1680 out_udp: 1681 tcp4_proc_exit(); 1682 out_tcp: 1683 raw_proc_exit(); 1684 out_raw: 1685 rc = -ENOMEM; 1686 goto out; 1687 } 1688 1689 #else /* CONFIG_PROC_FS */ 1690 static int __init ipv4_proc_init(void) 1691 { 1692 return 0; 1693 } 1694 #endif /* CONFIG_PROC_FS */ 1695 1696 MODULE_ALIAS_NETPROTO(PF_INET); 1697 1698