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 EXPORT_SYMBOL(ipv4_config); 128 129 /* New destruction routine */ 130 131 void inet_sock_destruct(struct sock *sk) 132 { 133 struct inet_sock *inet = inet_sk(sk); 134 135 __skb_queue_purge(&sk->sk_receive_queue); 136 __skb_queue_purge(&sk->sk_error_queue); 137 138 sk_mem_reclaim(sk); 139 140 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) { 141 pr_err("Attempt to release TCP socket in state %d %p\n", 142 sk->sk_state, sk); 143 return; 144 } 145 if (!sock_flag(sk, SOCK_DEAD)) { 146 pr_err("Attempt to release alive inet socket %p\n", sk); 147 return; 148 } 149 150 WARN_ON(atomic_read(&sk->sk_rmem_alloc)); 151 WARN_ON(atomic_read(&sk->sk_wmem_alloc)); 152 WARN_ON(sk->sk_wmem_queued); 153 WARN_ON(sk->sk_forward_alloc); 154 155 kfree(inet->opt); 156 dst_release(sk->sk_dst_cache); 157 sk_refcnt_debug_dec(sk); 158 } 159 EXPORT_SYMBOL(inet_sock_destruct); 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->inet_num) { 178 if (sk->sk_prot->get_port(sk, 0)) { 179 release_sock(sk); 180 return -EAGAIN; 181 } 182 inet->inet_sport = htons(inet->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 EXPORT_SYMBOL(inet_listen); 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 const struct net_protocol *ipprot; 248 249 if (net_eq(net, &init_net)) 250 return 1; 251 252 hash = protocol & (MAX_INET_PROTOS - 1); 253 ipprot = rcu_dereference(inet_protos[hash]); 254 255 if (ipprot == NULL) 256 /* raw IP is OK */ 257 return 1; 258 return ipprot->netns_ok; 259 } 260 261 /* 262 * Create an inet socket. 263 */ 264 265 static int inet_create(struct net *net, struct socket *sock, int protocol, 266 int kern) 267 { 268 struct sock *sk; 269 struct inet_protosw *answer; 270 struct inet_sock *inet; 271 struct proto *answer_prot; 272 unsigned char answer_flags; 273 char answer_no_check; 274 int try_loading_module = 0; 275 int err; 276 277 if (unlikely(!inet_ehash_secret)) 278 if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM) 279 build_ehash_secret(); 280 281 sock->state = SS_UNCONNECTED; 282 283 /* Look for the requested type/protocol pair. */ 284 lookup_protocol: 285 err = -ESOCKTNOSUPPORT; 286 rcu_read_lock(); 287 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) { 288 289 err = 0; 290 /* Check the non-wild match. */ 291 if (protocol == answer->protocol) { 292 if (protocol != IPPROTO_IP) 293 break; 294 } else { 295 /* Check for the two wild cases. */ 296 if (IPPROTO_IP == protocol) { 297 protocol = answer->protocol; 298 break; 299 } 300 if (IPPROTO_IP == answer->protocol) 301 break; 302 } 303 err = -EPROTONOSUPPORT; 304 } 305 306 if (unlikely(err)) { 307 if (try_loading_module < 2) { 308 rcu_read_unlock(); 309 /* 310 * Be more specific, e.g. net-pf-2-proto-132-type-1 311 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) 312 */ 313 if (++try_loading_module == 1) 314 request_module("net-pf-%d-proto-%d-type-%d", 315 PF_INET, protocol, sock->type); 316 /* 317 * Fall back to generic, e.g. net-pf-2-proto-132 318 * (net-pf-PF_INET-proto-IPPROTO_SCTP) 319 */ 320 else 321 request_module("net-pf-%d-proto-%d", 322 PF_INET, protocol); 323 goto lookup_protocol; 324 } else 325 goto out_rcu_unlock; 326 } 327 328 err = -EPERM; 329 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW)) 330 goto out_rcu_unlock; 331 332 err = -EAFNOSUPPORT; 333 if (!inet_netns_ok(net, protocol)) 334 goto out_rcu_unlock; 335 336 sock->ops = answer->ops; 337 answer_prot = answer->prot; 338 answer_no_check = answer->no_check; 339 answer_flags = answer->flags; 340 rcu_read_unlock(); 341 342 WARN_ON(answer_prot->slab == NULL); 343 344 err = -ENOBUFS; 345 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot); 346 if (sk == NULL) 347 goto out; 348 349 err = 0; 350 sk->sk_no_check = answer_no_check; 351 if (INET_PROTOSW_REUSE & answer_flags) 352 sk->sk_reuse = 1; 353 354 inet = inet_sk(sk); 355 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 356 357 if (SOCK_RAW == sock->type) { 358 inet->inet_num = protocol; 359 if (IPPROTO_RAW == protocol) 360 inet->hdrincl = 1; 361 } 362 363 if (ipv4_config.no_pmtu_disc) 364 inet->pmtudisc = IP_PMTUDISC_DONT; 365 else 366 inet->pmtudisc = IP_PMTUDISC_WANT; 367 368 inet->inet_id = 0; 369 370 sock_init_data(sock, sk); 371 372 sk->sk_destruct = inet_sock_destruct; 373 sk->sk_protocol = protocol; 374 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 375 376 inet->uc_ttl = -1; 377 inet->mc_loop = 1; 378 inet->mc_ttl = 1; 379 inet->mc_all = 1; 380 inet->mc_index = 0; 381 inet->mc_list = NULL; 382 383 sk_refcnt_debug_inc(sk); 384 385 if (inet->inet_num) { 386 /* It assumes that any protocol which allows 387 * the user to assign a number at socket 388 * creation time automatically 389 * shares. 390 */ 391 inet->inet_sport = htons(inet->inet_num); 392 /* Add to protocol hash chains. */ 393 sk->sk_prot->hash(sk); 394 } 395 396 if (sk->sk_prot->init) { 397 err = sk->sk_prot->init(sk); 398 if (err) 399 sk_common_release(sk); 400 } 401 out: 402 return err; 403 out_rcu_unlock: 404 rcu_read_unlock(); 405 goto out; 406 } 407 408 409 /* 410 * The peer socket should always be NULL (or else). When we call this 411 * function we are destroying the object and from then on nobody 412 * should refer to it. 413 */ 414 int inet_release(struct socket *sock) 415 { 416 struct sock *sk = sock->sk; 417 418 if (sk) { 419 long timeout; 420 421 /* Applications forget to leave groups before exiting */ 422 ip_mc_drop_socket(sk); 423 424 /* If linger is set, we don't return until the close 425 * is complete. Otherwise we return immediately. The 426 * actually closing is done the same either way. 427 * 428 * If the close is due to the process exiting, we never 429 * linger.. 430 */ 431 timeout = 0; 432 if (sock_flag(sk, SOCK_LINGER) && 433 !(current->flags & PF_EXITING)) 434 timeout = sk->sk_lingertime; 435 sock->sk = NULL; 436 sk->sk_prot->close(sk, timeout); 437 } 438 return 0; 439 } 440 EXPORT_SYMBOL(inet_release); 441 442 /* It is off by default, see below. */ 443 int sysctl_ip_nonlocal_bind __read_mostly; 444 EXPORT_SYMBOL(sysctl_ip_nonlocal_bind); 445 446 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 447 { 448 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 449 struct sock *sk = sock->sk; 450 struct inet_sock *inet = inet_sk(sk); 451 unsigned short snum; 452 int chk_addr_ret; 453 int err; 454 455 /* If the socket has its own bind function then use it. (RAW) */ 456 if (sk->sk_prot->bind) { 457 err = sk->sk_prot->bind(sk, uaddr, addr_len); 458 goto out; 459 } 460 err = -EINVAL; 461 if (addr_len < sizeof(struct sockaddr_in)) 462 goto out; 463 464 chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr); 465 466 /* Not specified by any standard per-se, however it breaks too 467 * many applications when removed. It is unfortunate since 468 * allowing applications to make a non-local bind solves 469 * several problems with systems using dynamic addressing. 470 * (ie. your servers still start up even if your ISDN link 471 * is temporarily down) 472 */ 473 err = -EADDRNOTAVAIL; 474 if (!sysctl_ip_nonlocal_bind && 475 !(inet->freebind || inet->transparent) && 476 addr->sin_addr.s_addr != htonl(INADDR_ANY) && 477 chk_addr_ret != RTN_LOCAL && 478 chk_addr_ret != RTN_MULTICAST && 479 chk_addr_ret != RTN_BROADCAST) 480 goto out; 481 482 snum = ntohs(addr->sin_port); 483 err = -EACCES; 484 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) 485 goto out; 486 487 /* We keep a pair of addresses. rcv_saddr is the one 488 * used by hash lookups, and saddr is used for transmit. 489 * 490 * In the BSD API these are the same except where it 491 * would be illegal to use them (multicast/broadcast) in 492 * which case the sending device address is used. 493 */ 494 lock_sock(sk); 495 496 /* Check these errors (active socket, double bind). */ 497 err = -EINVAL; 498 if (sk->sk_state != TCP_CLOSE || inet->inet_num) 499 goto out_release_sock; 500 501 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 502 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 503 inet->inet_saddr = 0; /* Use device */ 504 505 /* Make sure we are allowed to bind here. */ 506 if (sk->sk_prot->get_port(sk, snum)) { 507 inet->inet_saddr = inet->inet_rcv_saddr = 0; 508 err = -EADDRINUSE; 509 goto out_release_sock; 510 } 511 512 if (inet->inet_rcv_saddr) 513 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 514 if (snum) 515 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 516 inet->inet_sport = htons(inet->inet_num); 517 inet->inet_daddr = 0; 518 inet->inet_dport = 0; 519 sk_dst_reset(sk); 520 err = 0; 521 out_release_sock: 522 release_sock(sk); 523 out: 524 return err; 525 } 526 EXPORT_SYMBOL(inet_bind); 527 528 int inet_dgram_connect(struct socket *sock, struct sockaddr * uaddr, 529 int addr_len, int flags) 530 { 531 struct sock *sk = sock->sk; 532 533 if (uaddr->sa_family == AF_UNSPEC) 534 return sk->sk_prot->disconnect(sk, flags); 535 536 if (!inet_sk(sk)->inet_num && inet_autobind(sk)) 537 return -EAGAIN; 538 return sk->sk_prot->connect(sk, (struct sockaddr *)uaddr, addr_len); 539 } 540 EXPORT_SYMBOL(inet_dgram_connect); 541 542 static long inet_wait_for_connect(struct sock *sk, long timeo) 543 { 544 DEFINE_WAIT(wait); 545 546 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 547 548 /* Basic assumption: if someone sets sk->sk_err, he _must_ 549 * change state of the socket from TCP_SYN_*. 550 * Connect() does not allow to get error notifications 551 * without closing the socket. 552 */ 553 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 554 release_sock(sk); 555 timeo = schedule_timeout(timeo); 556 lock_sock(sk); 557 if (signal_pending(current) || !timeo) 558 break; 559 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 560 } 561 finish_wait(sk->sk_sleep, &wait); 562 return timeo; 563 } 564 565 /* 566 * Connect to a remote host. There is regrettably still a little 567 * TCP 'magic' in here. 568 */ 569 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 570 int addr_len, int flags) 571 { 572 struct sock *sk = sock->sk; 573 int err; 574 long timeo; 575 576 lock_sock(sk); 577 578 if (uaddr->sa_family == AF_UNSPEC) { 579 err = sk->sk_prot->disconnect(sk, flags); 580 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 581 goto out; 582 } 583 584 switch (sock->state) { 585 default: 586 err = -EINVAL; 587 goto out; 588 case SS_CONNECTED: 589 err = -EISCONN; 590 goto out; 591 case SS_CONNECTING: 592 err = -EALREADY; 593 /* Fall out of switch with err, set for this state */ 594 break; 595 case SS_UNCONNECTED: 596 err = -EISCONN; 597 if (sk->sk_state != TCP_CLOSE) 598 goto out; 599 600 err = sk->sk_prot->connect(sk, uaddr, addr_len); 601 if (err < 0) 602 goto out; 603 604 sock->state = SS_CONNECTING; 605 606 /* Just entered SS_CONNECTING state; the only 607 * difference is that return value in non-blocking 608 * case is EINPROGRESS, rather than EALREADY. 609 */ 610 err = -EINPROGRESS; 611 break; 612 } 613 614 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 615 616 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 617 /* Error code is set above */ 618 if (!timeo || !inet_wait_for_connect(sk, timeo)) 619 goto out; 620 621 err = sock_intr_errno(timeo); 622 if (signal_pending(current)) 623 goto out; 624 } 625 626 /* Connection was closed by RST, timeout, ICMP error 627 * or another process disconnected us. 628 */ 629 if (sk->sk_state == TCP_CLOSE) 630 goto sock_error; 631 632 /* sk->sk_err may be not zero now, if RECVERR was ordered by user 633 * and error was received after socket entered established state. 634 * Hence, it is handled normally after connect() return successfully. 635 */ 636 637 sock->state = SS_CONNECTED; 638 err = 0; 639 out: 640 release_sock(sk); 641 return err; 642 643 sock_error: 644 err = sock_error(sk) ? : -ECONNABORTED; 645 sock->state = SS_UNCONNECTED; 646 if (sk->sk_prot->disconnect(sk, flags)) 647 sock->state = SS_DISCONNECTING; 648 goto out; 649 } 650 EXPORT_SYMBOL(inet_stream_connect); 651 652 /* 653 * Accept a pending connection. The TCP layer now gives BSD semantics. 654 */ 655 656 int inet_accept(struct socket *sock, struct socket *newsock, int flags) 657 { 658 struct sock *sk1 = sock->sk; 659 int err = -EINVAL; 660 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err); 661 662 if (!sk2) 663 goto do_err; 664 665 lock_sock(sk2); 666 667 WARN_ON(!((1 << sk2->sk_state) & 668 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE))); 669 670 sock_graft(sk2, newsock); 671 672 newsock->state = SS_CONNECTED; 673 err = 0; 674 release_sock(sk2); 675 do_err: 676 return err; 677 } 678 EXPORT_SYMBOL(inet_accept); 679 680 681 /* 682 * This does both peername and sockname. 683 */ 684 int inet_getname(struct socket *sock, struct sockaddr *uaddr, 685 int *uaddr_len, int peer) 686 { 687 struct sock *sk = sock->sk; 688 struct inet_sock *inet = inet_sk(sk); 689 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr); 690 691 sin->sin_family = AF_INET; 692 if (peer) { 693 if (!inet->inet_dport || 694 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 695 peer == 1)) 696 return -ENOTCONN; 697 sin->sin_port = inet->inet_dport; 698 sin->sin_addr.s_addr = inet->inet_daddr; 699 } else { 700 __be32 addr = inet->inet_rcv_saddr; 701 if (!addr) 702 addr = inet->inet_saddr; 703 sin->sin_port = inet->inet_sport; 704 sin->sin_addr.s_addr = addr; 705 } 706 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 707 *uaddr_len = sizeof(*sin); 708 return 0; 709 } 710 EXPORT_SYMBOL(inet_getname); 711 712 int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 713 size_t size) 714 { 715 struct sock *sk = sock->sk; 716 717 /* We may need to bind the socket. */ 718 if (!inet_sk(sk)->inet_num && inet_autobind(sk)) 719 return -EAGAIN; 720 721 return sk->sk_prot->sendmsg(iocb, sk, msg, size); 722 } 723 EXPORT_SYMBOL(inet_sendmsg); 724 725 726 static ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, 727 size_t size, int flags) 728 { 729 struct sock *sk = sock->sk; 730 731 /* We may need to bind the socket. */ 732 if (!inet_sk(sk)->inet_num && inet_autobind(sk)) 733 return -EAGAIN; 734 735 if (sk->sk_prot->sendpage) 736 return sk->sk_prot->sendpage(sk, page, offset, size, flags); 737 return sock_no_sendpage(sock, page, offset, size, flags); 738 } 739 740 741 int inet_shutdown(struct socket *sock, int how) 742 { 743 struct sock *sk = sock->sk; 744 int err = 0; 745 746 /* This should really check to make sure 747 * the socket is a TCP socket. (WHY AC...) 748 */ 749 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and 750 1->2 bit 2 snds. 751 2->3 */ 752 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ 753 return -EINVAL; 754 755 lock_sock(sk); 756 if (sock->state == SS_CONNECTING) { 757 if ((1 << sk->sk_state) & 758 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) 759 sock->state = SS_DISCONNECTING; 760 else 761 sock->state = SS_CONNECTED; 762 } 763 764 switch (sk->sk_state) { 765 case TCP_CLOSE: 766 err = -ENOTCONN; 767 /* Hack to wake up other listeners, who can poll for 768 POLLHUP, even on eg. unconnected UDP sockets -- RR */ 769 default: 770 sk->sk_shutdown |= how; 771 if (sk->sk_prot->shutdown) 772 sk->sk_prot->shutdown(sk, how); 773 break; 774 775 /* Remaining two branches are temporary solution for missing 776 * close() in multithreaded environment. It is _not_ a good idea, 777 * but we have no choice until close() is repaired at VFS level. 778 */ 779 case TCP_LISTEN: 780 if (!(how & RCV_SHUTDOWN)) 781 break; 782 /* Fall through */ 783 case TCP_SYN_SENT: 784 err = sk->sk_prot->disconnect(sk, O_NONBLOCK); 785 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 786 break; 787 } 788 789 /* Wake up anyone sleeping in poll. */ 790 sk->sk_state_change(sk); 791 release_sock(sk); 792 return err; 793 } 794 EXPORT_SYMBOL(inet_shutdown); 795 796 /* 797 * ioctl() calls you can issue on an INET socket. Most of these are 798 * device configuration and stuff and very rarely used. Some ioctls 799 * pass on to the socket itself. 800 * 801 * NOTE: I like the idea of a module for the config stuff. ie ifconfig 802 * loads the devconfigure module does its configuring and unloads it. 803 * There's a good 20K of config code hanging around the kernel. 804 */ 805 806 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 807 { 808 struct sock *sk = sock->sk; 809 int err = 0; 810 struct net *net = sock_net(sk); 811 812 switch (cmd) { 813 case SIOCGSTAMP: 814 err = sock_get_timestamp(sk, (struct timeval __user *)arg); 815 break; 816 case SIOCGSTAMPNS: 817 err = sock_get_timestampns(sk, (struct timespec __user *)arg); 818 break; 819 case SIOCADDRT: 820 case SIOCDELRT: 821 case SIOCRTMSG: 822 err = ip_rt_ioctl(net, cmd, (void __user *)arg); 823 break; 824 case SIOCDARP: 825 case SIOCGARP: 826 case SIOCSARP: 827 err = arp_ioctl(net, cmd, (void __user *)arg); 828 break; 829 case SIOCGIFADDR: 830 case SIOCSIFADDR: 831 case SIOCGIFBRDADDR: 832 case SIOCSIFBRDADDR: 833 case SIOCGIFNETMASK: 834 case SIOCSIFNETMASK: 835 case SIOCGIFDSTADDR: 836 case SIOCSIFDSTADDR: 837 case SIOCSIFPFLAGS: 838 case SIOCGIFPFLAGS: 839 case SIOCSIFFLAGS: 840 err = devinet_ioctl(net, cmd, (void __user *)arg); 841 break; 842 default: 843 if (sk->sk_prot->ioctl) 844 err = sk->sk_prot->ioctl(sk, cmd, arg); 845 else 846 err = -ENOIOCTLCMD; 847 break; 848 } 849 return err; 850 } 851 EXPORT_SYMBOL(inet_ioctl); 852 853 const struct proto_ops inet_stream_ops = { 854 .family = PF_INET, 855 .owner = THIS_MODULE, 856 .release = inet_release, 857 .bind = inet_bind, 858 .connect = inet_stream_connect, 859 .socketpair = sock_no_socketpair, 860 .accept = inet_accept, 861 .getname = inet_getname, 862 .poll = tcp_poll, 863 .ioctl = inet_ioctl, 864 .listen = inet_listen, 865 .shutdown = inet_shutdown, 866 .setsockopt = sock_common_setsockopt, 867 .getsockopt = sock_common_getsockopt, 868 .sendmsg = tcp_sendmsg, 869 .recvmsg = sock_common_recvmsg, 870 .mmap = sock_no_mmap, 871 .sendpage = tcp_sendpage, 872 .splice_read = tcp_splice_read, 873 #ifdef CONFIG_COMPAT 874 .compat_setsockopt = compat_sock_common_setsockopt, 875 .compat_getsockopt = compat_sock_common_getsockopt, 876 #endif 877 }; 878 EXPORT_SYMBOL(inet_stream_ops); 879 880 const struct proto_ops inet_dgram_ops = { 881 .family = PF_INET, 882 .owner = THIS_MODULE, 883 .release = inet_release, 884 .bind = inet_bind, 885 .connect = inet_dgram_connect, 886 .socketpair = sock_no_socketpair, 887 .accept = sock_no_accept, 888 .getname = inet_getname, 889 .poll = udp_poll, 890 .ioctl = inet_ioctl, 891 .listen = sock_no_listen, 892 .shutdown = inet_shutdown, 893 .setsockopt = sock_common_setsockopt, 894 .getsockopt = sock_common_getsockopt, 895 .sendmsg = inet_sendmsg, 896 .recvmsg = sock_common_recvmsg, 897 .mmap = sock_no_mmap, 898 .sendpage = inet_sendpage, 899 #ifdef CONFIG_COMPAT 900 .compat_setsockopt = compat_sock_common_setsockopt, 901 .compat_getsockopt = compat_sock_common_getsockopt, 902 #endif 903 }; 904 EXPORT_SYMBOL(inet_dgram_ops); 905 906 /* 907 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 908 * udp_poll 909 */ 910 static const struct proto_ops inet_sockraw_ops = { 911 .family = PF_INET, 912 .owner = THIS_MODULE, 913 .release = inet_release, 914 .bind = inet_bind, 915 .connect = inet_dgram_connect, 916 .socketpair = sock_no_socketpair, 917 .accept = sock_no_accept, 918 .getname = inet_getname, 919 .poll = datagram_poll, 920 .ioctl = inet_ioctl, 921 .listen = sock_no_listen, 922 .shutdown = inet_shutdown, 923 .setsockopt = sock_common_setsockopt, 924 .getsockopt = sock_common_getsockopt, 925 .sendmsg = inet_sendmsg, 926 .recvmsg = sock_common_recvmsg, 927 .mmap = sock_no_mmap, 928 .sendpage = inet_sendpage, 929 #ifdef CONFIG_COMPAT 930 .compat_setsockopt = compat_sock_common_setsockopt, 931 .compat_getsockopt = compat_sock_common_getsockopt, 932 #endif 933 }; 934 935 static const struct net_proto_family inet_family_ops = { 936 .family = PF_INET, 937 .create = inet_create, 938 .owner = THIS_MODULE, 939 }; 940 941 /* Upon startup we insert all the elements in inetsw_array[] into 942 * the linked list inetsw. 943 */ 944 static struct inet_protosw inetsw_array[] = 945 { 946 { 947 .type = SOCK_STREAM, 948 .protocol = IPPROTO_TCP, 949 .prot = &tcp_prot, 950 .ops = &inet_stream_ops, 951 .no_check = 0, 952 .flags = INET_PROTOSW_PERMANENT | 953 INET_PROTOSW_ICSK, 954 }, 955 956 { 957 .type = SOCK_DGRAM, 958 .protocol = IPPROTO_UDP, 959 .prot = &udp_prot, 960 .ops = &inet_dgram_ops, 961 .no_check = UDP_CSUM_DEFAULT, 962 .flags = INET_PROTOSW_PERMANENT, 963 }, 964 965 966 { 967 .type = SOCK_RAW, 968 .protocol = IPPROTO_IP, /* wild card */ 969 .prot = &raw_prot, 970 .ops = &inet_sockraw_ops, 971 .no_check = UDP_CSUM_DEFAULT, 972 .flags = INET_PROTOSW_REUSE, 973 } 974 }; 975 976 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) 977 978 void inet_register_protosw(struct inet_protosw *p) 979 { 980 struct list_head *lh; 981 struct inet_protosw *answer; 982 int protocol = p->protocol; 983 struct list_head *last_perm; 984 985 spin_lock_bh(&inetsw_lock); 986 987 if (p->type >= SOCK_MAX) 988 goto out_illegal; 989 990 /* If we are trying to override a permanent protocol, bail. */ 991 answer = NULL; 992 last_perm = &inetsw[p->type]; 993 list_for_each(lh, &inetsw[p->type]) { 994 answer = list_entry(lh, struct inet_protosw, list); 995 996 /* Check only the non-wild match. */ 997 if (INET_PROTOSW_PERMANENT & answer->flags) { 998 if (protocol == answer->protocol) 999 break; 1000 last_perm = lh; 1001 } 1002 1003 answer = NULL; 1004 } 1005 if (answer) 1006 goto out_permanent; 1007 1008 /* Add the new entry after the last permanent entry if any, so that 1009 * the new entry does not override a permanent entry when matched with 1010 * a wild-card protocol. But it is allowed to override any existing 1011 * non-permanent entry. This means that when we remove this entry, the 1012 * system automatically returns to the old behavior. 1013 */ 1014 list_add_rcu(&p->list, last_perm); 1015 out: 1016 spin_unlock_bh(&inetsw_lock); 1017 1018 return; 1019 1020 out_permanent: 1021 printk(KERN_ERR "Attempt to override permanent protocol %d.\n", 1022 protocol); 1023 goto out; 1024 1025 out_illegal: 1026 printk(KERN_ERR 1027 "Ignoring attempt to register invalid socket type %d.\n", 1028 p->type); 1029 goto out; 1030 } 1031 EXPORT_SYMBOL(inet_register_protosw); 1032 1033 void inet_unregister_protosw(struct inet_protosw *p) 1034 { 1035 if (INET_PROTOSW_PERMANENT & p->flags) { 1036 printk(KERN_ERR 1037 "Attempt to unregister permanent protocol %d.\n", 1038 p->protocol); 1039 } else { 1040 spin_lock_bh(&inetsw_lock); 1041 list_del_rcu(&p->list); 1042 spin_unlock_bh(&inetsw_lock); 1043 1044 synchronize_net(); 1045 } 1046 } 1047 EXPORT_SYMBOL(inet_unregister_protosw); 1048 1049 /* 1050 * Shall we try to damage output packets if routing dev changes? 1051 */ 1052 1053 int sysctl_ip_dynaddr __read_mostly; 1054 1055 static int inet_sk_reselect_saddr(struct sock *sk) 1056 { 1057 struct inet_sock *inet = inet_sk(sk); 1058 int err; 1059 struct rtable *rt; 1060 __be32 old_saddr = inet->inet_saddr; 1061 __be32 new_saddr; 1062 __be32 daddr = inet->inet_daddr; 1063 1064 if (inet->opt && inet->opt->srr) 1065 daddr = inet->opt->faddr; 1066 1067 /* Query new route. */ 1068 err = ip_route_connect(&rt, daddr, 0, 1069 RT_CONN_FLAGS(sk), 1070 sk->sk_bound_dev_if, 1071 sk->sk_protocol, 1072 inet->inet_sport, inet->inet_dport, sk, 0); 1073 if (err) 1074 return err; 1075 1076 sk_setup_caps(sk, &rt->u.dst); 1077 1078 new_saddr = rt->rt_src; 1079 1080 if (new_saddr == old_saddr) 1081 return 0; 1082 1083 if (sysctl_ip_dynaddr > 1) { 1084 printk(KERN_INFO "%s(): shifting inet->saddr from %pI4 to %pI4\n", 1085 __func__, &old_saddr, &new_saddr); 1086 } 1087 1088 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr; 1089 1090 /* 1091 * XXX The only one ugly spot where we need to 1092 * XXX really change the sockets identity after 1093 * XXX it has entered the hashes. -DaveM 1094 * 1095 * Besides that, it does not check for connection 1096 * uniqueness. Wait for troubles. 1097 */ 1098 __sk_prot_rehash(sk); 1099 return 0; 1100 } 1101 1102 int inet_sk_rebuild_header(struct sock *sk) 1103 { 1104 struct inet_sock *inet = inet_sk(sk); 1105 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); 1106 __be32 daddr; 1107 int err; 1108 1109 /* Route is OK, nothing to do. */ 1110 if (rt) 1111 return 0; 1112 1113 /* Reroute. */ 1114 daddr = inet->inet_daddr; 1115 if (inet->opt && inet->opt->srr) 1116 daddr = inet->opt->faddr; 1117 { 1118 struct flowi fl = { 1119 .oif = sk->sk_bound_dev_if, 1120 .mark = sk->sk_mark, 1121 .nl_u = { 1122 .ip4_u = { 1123 .daddr = daddr, 1124 .saddr = inet->inet_saddr, 1125 .tos = RT_CONN_FLAGS(sk), 1126 }, 1127 }, 1128 .proto = sk->sk_protocol, 1129 .flags = inet_sk_flowi_flags(sk), 1130 .uli_u = { 1131 .ports = { 1132 .sport = inet->inet_sport, 1133 .dport = inet->inet_dport, 1134 }, 1135 }, 1136 }; 1137 1138 security_sk_classify_flow(sk, &fl); 1139 err = ip_route_output_flow(sock_net(sk), &rt, &fl, sk, 0); 1140 } 1141 if (!err) 1142 sk_setup_caps(sk, &rt->u.dst); 1143 else { 1144 /* Routing failed... */ 1145 sk->sk_route_caps = 0; 1146 /* 1147 * Other protocols have to map its equivalent state to TCP_SYN_SENT. 1148 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme 1149 */ 1150 if (!sysctl_ip_dynaddr || 1151 sk->sk_state != TCP_SYN_SENT || 1152 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 1153 (err = inet_sk_reselect_saddr(sk)) != 0) 1154 sk->sk_err_soft = -err; 1155 } 1156 1157 return err; 1158 } 1159 EXPORT_SYMBOL(inet_sk_rebuild_header); 1160 1161 static int inet_gso_send_check(struct sk_buff *skb) 1162 { 1163 struct iphdr *iph; 1164 const struct net_protocol *ops; 1165 int proto; 1166 int ihl; 1167 int err = -EINVAL; 1168 1169 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1170 goto out; 1171 1172 iph = ip_hdr(skb); 1173 ihl = iph->ihl * 4; 1174 if (ihl < sizeof(*iph)) 1175 goto out; 1176 1177 if (unlikely(!pskb_may_pull(skb, ihl))) 1178 goto out; 1179 1180 __skb_pull(skb, ihl); 1181 skb_reset_transport_header(skb); 1182 iph = ip_hdr(skb); 1183 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1184 err = -EPROTONOSUPPORT; 1185 1186 rcu_read_lock(); 1187 ops = rcu_dereference(inet_protos[proto]); 1188 if (likely(ops && ops->gso_send_check)) 1189 err = ops->gso_send_check(skb); 1190 rcu_read_unlock(); 1191 1192 out: 1193 return err; 1194 } 1195 1196 static struct sk_buff *inet_gso_segment(struct sk_buff *skb, int features) 1197 { 1198 struct sk_buff *segs = ERR_PTR(-EINVAL); 1199 struct iphdr *iph; 1200 const struct net_protocol *ops; 1201 int proto; 1202 int ihl; 1203 int id; 1204 unsigned int offset = 0; 1205 1206 if (!(features & NETIF_F_V4_CSUM)) 1207 features &= ~NETIF_F_SG; 1208 1209 if (unlikely(skb_shinfo(skb)->gso_type & 1210 ~(SKB_GSO_TCPV4 | 1211 SKB_GSO_UDP | 1212 SKB_GSO_DODGY | 1213 SKB_GSO_TCP_ECN | 1214 0))) 1215 goto out; 1216 1217 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1218 goto out; 1219 1220 iph = ip_hdr(skb); 1221 ihl = iph->ihl * 4; 1222 if (ihl < sizeof(*iph)) 1223 goto out; 1224 1225 if (unlikely(!pskb_may_pull(skb, ihl))) 1226 goto out; 1227 1228 __skb_pull(skb, ihl); 1229 skb_reset_transport_header(skb); 1230 iph = ip_hdr(skb); 1231 id = ntohs(iph->id); 1232 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1233 segs = ERR_PTR(-EPROTONOSUPPORT); 1234 1235 rcu_read_lock(); 1236 ops = rcu_dereference(inet_protos[proto]); 1237 if (likely(ops && ops->gso_segment)) 1238 segs = ops->gso_segment(skb, features); 1239 rcu_read_unlock(); 1240 1241 if (!segs || IS_ERR(segs)) 1242 goto out; 1243 1244 skb = segs; 1245 do { 1246 iph = ip_hdr(skb); 1247 if (proto == IPPROTO_UDP) { 1248 iph->id = htons(id); 1249 iph->frag_off = htons(offset >> 3); 1250 if (skb->next != NULL) 1251 iph->frag_off |= htons(IP_MF); 1252 offset += (skb->len - skb->mac_len - iph->ihl * 4); 1253 } else 1254 iph->id = htons(id++); 1255 iph->tot_len = htons(skb->len - skb->mac_len); 1256 iph->check = 0; 1257 iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl); 1258 } while ((skb = skb->next)); 1259 1260 out: 1261 return segs; 1262 } 1263 1264 static struct sk_buff **inet_gro_receive(struct sk_buff **head, 1265 struct sk_buff *skb) 1266 { 1267 const struct net_protocol *ops; 1268 struct sk_buff **pp = NULL; 1269 struct sk_buff *p; 1270 struct iphdr *iph; 1271 unsigned int hlen; 1272 unsigned int off; 1273 unsigned int id; 1274 int flush = 1; 1275 int proto; 1276 1277 off = skb_gro_offset(skb); 1278 hlen = off + sizeof(*iph); 1279 iph = skb_gro_header_fast(skb, off); 1280 if (skb_gro_header_hard(skb, hlen)) { 1281 iph = skb_gro_header_slow(skb, hlen, off); 1282 if (unlikely(!iph)) 1283 goto out; 1284 } 1285 1286 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1287 1288 rcu_read_lock(); 1289 ops = rcu_dereference(inet_protos[proto]); 1290 if (!ops || !ops->gro_receive) 1291 goto out_unlock; 1292 1293 if (*(u8 *)iph != 0x45) 1294 goto out_unlock; 1295 1296 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) 1297 goto out_unlock; 1298 1299 id = ntohl(*(u32 *)&iph->id); 1300 flush = (u16)((ntohl(*(u32 *)iph) ^ skb_gro_len(skb)) | (id ^ IP_DF)); 1301 id >>= 16; 1302 1303 for (p = *head; p; p = p->next) { 1304 struct iphdr *iph2; 1305 1306 if (!NAPI_GRO_CB(p)->same_flow) 1307 continue; 1308 1309 iph2 = ip_hdr(p); 1310 1311 if ((iph->protocol ^ iph2->protocol) | 1312 (iph->tos ^ iph2->tos) | 1313 (iph->saddr ^ iph2->saddr) | 1314 (iph->daddr ^ iph2->daddr)) { 1315 NAPI_GRO_CB(p)->same_flow = 0; 1316 continue; 1317 } 1318 1319 /* All fields must match except length and checksum. */ 1320 NAPI_GRO_CB(p)->flush |= 1321 (iph->ttl ^ iph2->ttl) | 1322 ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id); 1323 1324 NAPI_GRO_CB(p)->flush |= flush; 1325 } 1326 1327 NAPI_GRO_CB(skb)->flush |= flush; 1328 skb_gro_pull(skb, sizeof(*iph)); 1329 skb_set_transport_header(skb, skb_gro_offset(skb)); 1330 1331 pp = ops->gro_receive(head, skb); 1332 1333 out_unlock: 1334 rcu_read_unlock(); 1335 1336 out: 1337 NAPI_GRO_CB(skb)->flush |= flush; 1338 1339 return pp; 1340 } 1341 1342 static int inet_gro_complete(struct sk_buff *skb) 1343 { 1344 const struct net_protocol *ops; 1345 struct iphdr *iph = ip_hdr(skb); 1346 int proto = iph->protocol & (MAX_INET_PROTOS - 1); 1347 int err = -ENOSYS; 1348 __be16 newlen = htons(skb->len - skb_network_offset(skb)); 1349 1350 csum_replace2(&iph->check, iph->tot_len, newlen); 1351 iph->tot_len = newlen; 1352 1353 rcu_read_lock(); 1354 ops = rcu_dereference(inet_protos[proto]); 1355 if (WARN_ON(!ops || !ops->gro_complete)) 1356 goto out_unlock; 1357 1358 err = ops->gro_complete(skb); 1359 1360 out_unlock: 1361 rcu_read_unlock(); 1362 1363 return err; 1364 } 1365 1366 int inet_ctl_sock_create(struct sock **sk, unsigned short family, 1367 unsigned short type, unsigned char protocol, 1368 struct net *net) 1369 { 1370 struct socket *sock; 1371 int rc = sock_create_kern(family, type, protocol, &sock); 1372 1373 if (rc == 0) { 1374 *sk = sock->sk; 1375 (*sk)->sk_allocation = GFP_ATOMIC; 1376 /* 1377 * Unhash it so that IP input processing does not even see it, 1378 * we do not wish this socket to see incoming packets. 1379 */ 1380 (*sk)->sk_prot->unhash(*sk); 1381 1382 sk_change_net(*sk, net); 1383 } 1384 return rc; 1385 } 1386 EXPORT_SYMBOL_GPL(inet_ctl_sock_create); 1387 1388 unsigned long snmp_fold_field(void __percpu *mib[], int offt) 1389 { 1390 unsigned long res = 0; 1391 int i; 1392 1393 for_each_possible_cpu(i) { 1394 res += *(((unsigned long *) per_cpu_ptr(mib[0], i)) + offt); 1395 res += *(((unsigned long *) per_cpu_ptr(mib[1], i)) + offt); 1396 } 1397 return res; 1398 } 1399 EXPORT_SYMBOL_GPL(snmp_fold_field); 1400 1401 int snmp_mib_init(void __percpu *ptr[2], size_t mibsize) 1402 { 1403 BUG_ON(ptr == NULL); 1404 ptr[0] = __alloc_percpu(mibsize, __alignof__(unsigned long long)); 1405 if (!ptr[0]) 1406 goto err0; 1407 ptr[1] = __alloc_percpu(mibsize, __alignof__(unsigned long long)); 1408 if (!ptr[1]) 1409 goto err1; 1410 return 0; 1411 err1: 1412 free_percpu(ptr[0]); 1413 ptr[0] = NULL; 1414 err0: 1415 return -ENOMEM; 1416 } 1417 EXPORT_SYMBOL_GPL(snmp_mib_init); 1418 1419 void snmp_mib_free(void __percpu *ptr[2]) 1420 { 1421 BUG_ON(ptr == NULL); 1422 free_percpu(ptr[0]); 1423 free_percpu(ptr[1]); 1424 ptr[0] = ptr[1] = NULL; 1425 } 1426 EXPORT_SYMBOL_GPL(snmp_mib_free); 1427 1428 #ifdef CONFIG_IP_MULTICAST 1429 static const struct net_protocol igmp_protocol = { 1430 .handler = igmp_rcv, 1431 .netns_ok = 1, 1432 }; 1433 #endif 1434 1435 static const struct net_protocol tcp_protocol = { 1436 .handler = tcp_v4_rcv, 1437 .err_handler = tcp_v4_err, 1438 .gso_send_check = tcp_v4_gso_send_check, 1439 .gso_segment = tcp_tso_segment, 1440 .gro_receive = tcp4_gro_receive, 1441 .gro_complete = tcp4_gro_complete, 1442 .no_policy = 1, 1443 .netns_ok = 1, 1444 }; 1445 1446 static const struct net_protocol udp_protocol = { 1447 .handler = udp_rcv, 1448 .err_handler = udp_err, 1449 .gso_send_check = udp4_ufo_send_check, 1450 .gso_segment = udp4_ufo_fragment, 1451 .no_policy = 1, 1452 .netns_ok = 1, 1453 }; 1454 1455 static const struct net_protocol icmp_protocol = { 1456 .handler = icmp_rcv, 1457 .no_policy = 1, 1458 .netns_ok = 1, 1459 }; 1460 1461 static __net_init int ipv4_mib_init_net(struct net *net) 1462 { 1463 if (snmp_mib_init((void __percpu **)net->mib.tcp_statistics, 1464 sizeof(struct tcp_mib)) < 0) 1465 goto err_tcp_mib; 1466 if (snmp_mib_init((void __percpu **)net->mib.ip_statistics, 1467 sizeof(struct ipstats_mib)) < 0) 1468 goto err_ip_mib; 1469 if (snmp_mib_init((void __percpu **)net->mib.net_statistics, 1470 sizeof(struct linux_mib)) < 0) 1471 goto err_net_mib; 1472 if (snmp_mib_init((void __percpu **)net->mib.udp_statistics, 1473 sizeof(struct udp_mib)) < 0) 1474 goto err_udp_mib; 1475 if (snmp_mib_init((void __percpu **)net->mib.udplite_statistics, 1476 sizeof(struct udp_mib)) < 0) 1477 goto err_udplite_mib; 1478 if (snmp_mib_init((void __percpu **)net->mib.icmp_statistics, 1479 sizeof(struct icmp_mib)) < 0) 1480 goto err_icmp_mib; 1481 if (snmp_mib_init((void __percpu **)net->mib.icmpmsg_statistics, 1482 sizeof(struct icmpmsg_mib)) < 0) 1483 goto err_icmpmsg_mib; 1484 1485 tcp_mib_init(net); 1486 return 0; 1487 1488 err_icmpmsg_mib: 1489 snmp_mib_free((void __percpu **)net->mib.icmp_statistics); 1490 err_icmp_mib: 1491 snmp_mib_free((void __percpu **)net->mib.udplite_statistics); 1492 err_udplite_mib: 1493 snmp_mib_free((void __percpu **)net->mib.udp_statistics); 1494 err_udp_mib: 1495 snmp_mib_free((void __percpu **)net->mib.net_statistics); 1496 err_net_mib: 1497 snmp_mib_free((void __percpu **)net->mib.ip_statistics); 1498 err_ip_mib: 1499 snmp_mib_free((void __percpu **)net->mib.tcp_statistics); 1500 err_tcp_mib: 1501 return -ENOMEM; 1502 } 1503 1504 static __net_exit void ipv4_mib_exit_net(struct net *net) 1505 { 1506 snmp_mib_free((void __percpu **)net->mib.icmpmsg_statistics); 1507 snmp_mib_free((void __percpu **)net->mib.icmp_statistics); 1508 snmp_mib_free((void __percpu **)net->mib.udplite_statistics); 1509 snmp_mib_free((void __percpu **)net->mib.udp_statistics); 1510 snmp_mib_free((void __percpu **)net->mib.net_statistics); 1511 snmp_mib_free((void __percpu **)net->mib.ip_statistics); 1512 snmp_mib_free((void __percpu **)net->mib.tcp_statistics); 1513 } 1514 1515 static __net_initdata struct pernet_operations ipv4_mib_ops = { 1516 .init = ipv4_mib_init_net, 1517 .exit = ipv4_mib_exit_net, 1518 }; 1519 1520 static int __init init_ipv4_mibs(void) 1521 { 1522 return register_pernet_subsys(&ipv4_mib_ops); 1523 } 1524 1525 static int ipv4_proc_init(void); 1526 1527 /* 1528 * IP protocol layer initialiser 1529 */ 1530 1531 static struct packet_type ip_packet_type __read_mostly = { 1532 .type = cpu_to_be16(ETH_P_IP), 1533 .func = ip_rcv, 1534 .gso_send_check = inet_gso_send_check, 1535 .gso_segment = inet_gso_segment, 1536 .gro_receive = inet_gro_receive, 1537 .gro_complete = inet_gro_complete, 1538 }; 1539 1540 static int __init inet_init(void) 1541 { 1542 struct sk_buff *dummy_skb; 1543 struct inet_protosw *q; 1544 struct list_head *r; 1545 int rc = -EINVAL; 1546 1547 BUILD_BUG_ON(sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb)); 1548 1549 rc = proto_register(&tcp_prot, 1); 1550 if (rc) 1551 goto out; 1552 1553 rc = proto_register(&udp_prot, 1); 1554 if (rc) 1555 goto out_unregister_tcp_proto; 1556 1557 rc = proto_register(&raw_prot, 1); 1558 if (rc) 1559 goto out_unregister_udp_proto; 1560 1561 /* 1562 * Tell SOCKET that we are alive... 1563 */ 1564 1565 (void)sock_register(&inet_family_ops); 1566 1567 #ifdef CONFIG_SYSCTL 1568 ip_static_sysctl_init(); 1569 #endif 1570 1571 /* 1572 * Add all the base protocols. 1573 */ 1574 1575 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 1576 printk(KERN_CRIT "inet_init: Cannot add ICMP protocol\n"); 1577 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) 1578 printk(KERN_CRIT "inet_init: Cannot add UDP protocol\n"); 1579 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) 1580 printk(KERN_CRIT "inet_init: Cannot add TCP protocol\n"); 1581 #ifdef CONFIG_IP_MULTICAST 1582 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 1583 printk(KERN_CRIT "inet_init: Cannot add IGMP protocol\n"); 1584 #endif 1585 1586 /* Register the socket-side information for inet_create. */ 1587 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 1588 INIT_LIST_HEAD(r); 1589 1590 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 1591 inet_register_protosw(q); 1592 1593 /* 1594 * Set the ARP module up 1595 */ 1596 1597 arp_init(); 1598 1599 /* 1600 * Set the IP module up 1601 */ 1602 1603 ip_init(); 1604 1605 tcp_v4_init(); 1606 1607 /* Setup TCP slab cache for open requests. */ 1608 tcp_init(); 1609 1610 /* Setup UDP memory threshold */ 1611 udp_init(); 1612 1613 /* Add UDP-Lite (RFC 3828) */ 1614 udplite4_register(); 1615 1616 /* 1617 * Set the ICMP layer up 1618 */ 1619 1620 if (icmp_init() < 0) 1621 panic("Failed to create the ICMP control socket.\n"); 1622 1623 /* 1624 * Initialise the multicast router 1625 */ 1626 #if defined(CONFIG_IP_MROUTE) 1627 if (ip_mr_init()) 1628 printk(KERN_CRIT "inet_init: Cannot init ipv4 mroute\n"); 1629 #endif 1630 /* 1631 * Initialise per-cpu ipv4 mibs 1632 */ 1633 1634 if (init_ipv4_mibs()) 1635 printk(KERN_CRIT "inet_init: Cannot init ipv4 mibs\n"); 1636 1637 ipv4_proc_init(); 1638 1639 ipfrag_init(); 1640 1641 dev_add_pack(&ip_packet_type); 1642 1643 rc = 0; 1644 out: 1645 return rc; 1646 out_unregister_udp_proto: 1647 proto_unregister(&udp_prot); 1648 out_unregister_tcp_proto: 1649 proto_unregister(&tcp_prot); 1650 goto out; 1651 } 1652 1653 fs_initcall(inet_init); 1654 1655 /* ------------------------------------------------------------------------ */ 1656 1657 #ifdef CONFIG_PROC_FS 1658 static int __init ipv4_proc_init(void) 1659 { 1660 int rc = 0; 1661 1662 if (raw_proc_init()) 1663 goto out_raw; 1664 if (tcp4_proc_init()) 1665 goto out_tcp; 1666 if (udp4_proc_init()) 1667 goto out_udp; 1668 if (ip_misc_proc_init()) 1669 goto out_misc; 1670 out: 1671 return rc; 1672 out_misc: 1673 udp4_proc_exit(); 1674 out_udp: 1675 tcp4_proc_exit(); 1676 out_tcp: 1677 raw_proc_exit(); 1678 out_raw: 1679 rc = -ENOMEM; 1680 goto out; 1681 } 1682 1683 #else /* CONFIG_PROC_FS */ 1684 static int __init ipv4_proc_init(void) 1685 { 1686 return 0; 1687 } 1688 #endif /* CONFIG_PROC_FS */ 1689 1690 MODULE_ALIAS_NETPROTO(PF_INET); 1691 1692