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(rcu_dereference_check(sk->sk_dst_cache, 1)); 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 sock_rps_reset_flow(sk); 423 424 /* Applications forget to leave groups before exiting */ 425 ip_mc_drop_socket(sk); 426 427 /* If linger is set, we don't return until the close 428 * is complete. Otherwise we return immediately. The 429 * actually closing is done the same either way. 430 * 431 * If the close is due to the process exiting, we never 432 * linger.. 433 */ 434 timeout = 0; 435 if (sock_flag(sk, SOCK_LINGER) && 436 !(current->flags & PF_EXITING)) 437 timeout = sk->sk_lingertime; 438 sock->sk = NULL; 439 sk->sk_prot->close(sk, timeout); 440 } 441 return 0; 442 } 443 EXPORT_SYMBOL(inet_release); 444 445 /* It is off by default, see below. */ 446 int sysctl_ip_nonlocal_bind __read_mostly; 447 EXPORT_SYMBOL(sysctl_ip_nonlocal_bind); 448 449 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 450 { 451 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 452 struct sock *sk = sock->sk; 453 struct inet_sock *inet = inet_sk(sk); 454 unsigned short snum; 455 int chk_addr_ret; 456 int err; 457 458 /* If the socket has its own bind function then use it. (RAW) */ 459 if (sk->sk_prot->bind) { 460 err = sk->sk_prot->bind(sk, uaddr, addr_len); 461 goto out; 462 } 463 err = -EINVAL; 464 if (addr_len < sizeof(struct sockaddr_in)) 465 goto out; 466 467 chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr); 468 469 /* Not specified by any standard per-se, however it breaks too 470 * many applications when removed. It is unfortunate since 471 * allowing applications to make a non-local bind solves 472 * several problems with systems using dynamic addressing. 473 * (ie. your servers still start up even if your ISDN link 474 * is temporarily down) 475 */ 476 err = -EADDRNOTAVAIL; 477 if (!sysctl_ip_nonlocal_bind && 478 !(inet->freebind || inet->transparent) && 479 addr->sin_addr.s_addr != htonl(INADDR_ANY) && 480 chk_addr_ret != RTN_LOCAL && 481 chk_addr_ret != RTN_MULTICAST && 482 chk_addr_ret != RTN_BROADCAST) 483 goto out; 484 485 snum = ntohs(addr->sin_port); 486 err = -EACCES; 487 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) 488 goto out; 489 490 /* We keep a pair of addresses. rcv_saddr is the one 491 * used by hash lookups, and saddr is used for transmit. 492 * 493 * In the BSD API these are the same except where it 494 * would be illegal to use them (multicast/broadcast) in 495 * which case the sending device address is used. 496 */ 497 lock_sock(sk); 498 499 /* Check these errors (active socket, double bind). */ 500 err = -EINVAL; 501 if (sk->sk_state != TCP_CLOSE || inet->inet_num) 502 goto out_release_sock; 503 504 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 505 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 506 inet->inet_saddr = 0; /* Use device */ 507 508 /* Make sure we are allowed to bind here. */ 509 if (sk->sk_prot->get_port(sk, snum)) { 510 inet->inet_saddr = inet->inet_rcv_saddr = 0; 511 err = -EADDRINUSE; 512 goto out_release_sock; 513 } 514 515 if (inet->inet_rcv_saddr) 516 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 517 if (snum) 518 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 519 inet->inet_sport = htons(inet->inet_num); 520 inet->inet_daddr = 0; 521 inet->inet_dport = 0; 522 sk_dst_reset(sk); 523 err = 0; 524 out_release_sock: 525 release_sock(sk); 526 out: 527 return err; 528 } 529 EXPORT_SYMBOL(inet_bind); 530 531 int inet_dgram_connect(struct socket *sock, struct sockaddr * uaddr, 532 int addr_len, int flags) 533 { 534 struct sock *sk = sock->sk; 535 536 if (addr_len < sizeof(uaddr->sa_family)) 537 return -EINVAL; 538 if (uaddr->sa_family == AF_UNSPEC) 539 return sk->sk_prot->disconnect(sk, flags); 540 541 if (!inet_sk(sk)->inet_num && inet_autobind(sk)) 542 return -EAGAIN; 543 return sk->sk_prot->connect(sk, (struct sockaddr *)uaddr, addr_len); 544 } 545 EXPORT_SYMBOL(inet_dgram_connect); 546 547 static long inet_wait_for_connect(struct sock *sk, long timeo) 548 { 549 DEFINE_WAIT(wait); 550 551 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 552 553 /* Basic assumption: if someone sets sk->sk_err, he _must_ 554 * change state of the socket from TCP_SYN_*. 555 * Connect() does not allow to get error notifications 556 * without closing the socket. 557 */ 558 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 559 release_sock(sk); 560 timeo = schedule_timeout(timeo); 561 lock_sock(sk); 562 if (signal_pending(current) || !timeo) 563 break; 564 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 565 } 566 finish_wait(sk_sleep(sk), &wait); 567 return timeo; 568 } 569 570 /* 571 * Connect to a remote host. There is regrettably still a little 572 * TCP 'magic' in here. 573 */ 574 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 575 int addr_len, int flags) 576 { 577 struct sock *sk = sock->sk; 578 int err; 579 long timeo; 580 581 if (addr_len < sizeof(uaddr->sa_family)) 582 return -EINVAL; 583 584 lock_sock(sk); 585 586 if (uaddr->sa_family == AF_UNSPEC) { 587 err = sk->sk_prot->disconnect(sk, flags); 588 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 589 goto out; 590 } 591 592 switch (sock->state) { 593 default: 594 err = -EINVAL; 595 goto out; 596 case SS_CONNECTED: 597 err = -EISCONN; 598 goto out; 599 case SS_CONNECTING: 600 err = -EALREADY; 601 /* Fall out of switch with err, set for this state */ 602 break; 603 case SS_UNCONNECTED: 604 err = -EISCONN; 605 if (sk->sk_state != TCP_CLOSE) 606 goto out; 607 608 err = sk->sk_prot->connect(sk, uaddr, addr_len); 609 if (err < 0) 610 goto out; 611 612 sock->state = SS_CONNECTING; 613 614 /* Just entered SS_CONNECTING state; the only 615 * difference is that return value in non-blocking 616 * case is EINPROGRESS, rather than EALREADY. 617 */ 618 err = -EINPROGRESS; 619 break; 620 } 621 622 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 623 624 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 625 /* Error code is set above */ 626 if (!timeo || !inet_wait_for_connect(sk, timeo)) 627 goto out; 628 629 err = sock_intr_errno(timeo); 630 if (signal_pending(current)) 631 goto out; 632 } 633 634 /* Connection was closed by RST, timeout, ICMP error 635 * or another process disconnected us. 636 */ 637 if (sk->sk_state == TCP_CLOSE) 638 goto sock_error; 639 640 /* sk->sk_err may be not zero now, if RECVERR was ordered by user 641 * and error was received after socket entered established state. 642 * Hence, it is handled normally after connect() return successfully. 643 */ 644 645 sock->state = SS_CONNECTED; 646 err = 0; 647 out: 648 release_sock(sk); 649 return err; 650 651 sock_error: 652 err = sock_error(sk) ? : -ECONNABORTED; 653 sock->state = SS_UNCONNECTED; 654 if (sk->sk_prot->disconnect(sk, flags)) 655 sock->state = SS_DISCONNECTING; 656 goto out; 657 } 658 EXPORT_SYMBOL(inet_stream_connect); 659 660 /* 661 * Accept a pending connection. The TCP layer now gives BSD semantics. 662 */ 663 664 int inet_accept(struct socket *sock, struct socket *newsock, int flags) 665 { 666 struct sock *sk1 = sock->sk; 667 int err = -EINVAL; 668 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err); 669 670 if (!sk2) 671 goto do_err; 672 673 lock_sock(sk2); 674 675 WARN_ON(!((1 << sk2->sk_state) & 676 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE))); 677 678 sock_graft(sk2, newsock); 679 680 newsock->state = SS_CONNECTED; 681 err = 0; 682 release_sock(sk2); 683 do_err: 684 return err; 685 } 686 EXPORT_SYMBOL(inet_accept); 687 688 689 /* 690 * This does both peername and sockname. 691 */ 692 int inet_getname(struct socket *sock, struct sockaddr *uaddr, 693 int *uaddr_len, int peer) 694 { 695 struct sock *sk = sock->sk; 696 struct inet_sock *inet = inet_sk(sk); 697 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr); 698 699 sin->sin_family = AF_INET; 700 if (peer) { 701 if (!inet->inet_dport || 702 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 703 peer == 1)) 704 return -ENOTCONN; 705 sin->sin_port = inet->inet_dport; 706 sin->sin_addr.s_addr = inet->inet_daddr; 707 } else { 708 __be32 addr = inet->inet_rcv_saddr; 709 if (!addr) 710 addr = inet->inet_saddr; 711 sin->sin_port = inet->inet_sport; 712 sin->sin_addr.s_addr = addr; 713 } 714 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 715 *uaddr_len = sizeof(*sin); 716 return 0; 717 } 718 EXPORT_SYMBOL(inet_getname); 719 720 int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 721 size_t size) 722 { 723 struct sock *sk = sock->sk; 724 725 sock_rps_record_flow(sk); 726 727 /* We may need to bind the socket. */ 728 if (!inet_sk(sk)->inet_num && inet_autobind(sk)) 729 return -EAGAIN; 730 731 return sk->sk_prot->sendmsg(iocb, sk, msg, size); 732 } 733 EXPORT_SYMBOL(inet_sendmsg); 734 735 static ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, 736 size_t size, int flags) 737 { 738 struct sock *sk = sock->sk; 739 740 sock_rps_record_flow(sk); 741 742 /* We may need to bind the socket. */ 743 if (!inet_sk(sk)->inet_num && inet_autobind(sk)) 744 return -EAGAIN; 745 746 if (sk->sk_prot->sendpage) 747 return sk->sk_prot->sendpage(sk, page, offset, size, flags); 748 return sock_no_sendpage(sock, page, offset, size, flags); 749 } 750 751 int inet_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 752 size_t size, int flags) 753 { 754 struct sock *sk = sock->sk; 755 int addr_len = 0; 756 int err; 757 758 sock_rps_record_flow(sk); 759 760 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, 761 flags & ~MSG_DONTWAIT, &addr_len); 762 if (err >= 0) 763 msg->msg_namelen = addr_len; 764 return err; 765 } 766 EXPORT_SYMBOL(inet_recvmsg); 767 768 int inet_shutdown(struct socket *sock, int how) 769 { 770 struct sock *sk = sock->sk; 771 int err = 0; 772 773 /* This should really check to make sure 774 * the socket is a TCP socket. (WHY AC...) 775 */ 776 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and 777 1->2 bit 2 snds. 778 2->3 */ 779 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ 780 return -EINVAL; 781 782 lock_sock(sk); 783 if (sock->state == SS_CONNECTING) { 784 if ((1 << sk->sk_state) & 785 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) 786 sock->state = SS_DISCONNECTING; 787 else 788 sock->state = SS_CONNECTED; 789 } 790 791 switch (sk->sk_state) { 792 case TCP_CLOSE: 793 err = -ENOTCONN; 794 /* Hack to wake up other listeners, who can poll for 795 POLLHUP, even on eg. unconnected UDP sockets -- RR */ 796 default: 797 sk->sk_shutdown |= how; 798 if (sk->sk_prot->shutdown) 799 sk->sk_prot->shutdown(sk, how); 800 break; 801 802 /* Remaining two branches are temporary solution for missing 803 * close() in multithreaded environment. It is _not_ a good idea, 804 * but we have no choice until close() is repaired at VFS level. 805 */ 806 case TCP_LISTEN: 807 if (!(how & RCV_SHUTDOWN)) 808 break; 809 /* Fall through */ 810 case TCP_SYN_SENT: 811 err = sk->sk_prot->disconnect(sk, O_NONBLOCK); 812 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 813 break; 814 } 815 816 /* Wake up anyone sleeping in poll. */ 817 sk->sk_state_change(sk); 818 release_sock(sk); 819 return err; 820 } 821 EXPORT_SYMBOL(inet_shutdown); 822 823 /* 824 * ioctl() calls you can issue on an INET socket. Most of these are 825 * device configuration and stuff and very rarely used. Some ioctls 826 * pass on to the socket itself. 827 * 828 * NOTE: I like the idea of a module for the config stuff. ie ifconfig 829 * loads the devconfigure module does its configuring and unloads it. 830 * There's a good 20K of config code hanging around the kernel. 831 */ 832 833 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 834 { 835 struct sock *sk = sock->sk; 836 int err = 0; 837 struct net *net = sock_net(sk); 838 839 switch (cmd) { 840 case SIOCGSTAMP: 841 err = sock_get_timestamp(sk, (struct timeval __user *)arg); 842 break; 843 case SIOCGSTAMPNS: 844 err = sock_get_timestampns(sk, (struct timespec __user *)arg); 845 break; 846 case SIOCADDRT: 847 case SIOCDELRT: 848 case SIOCRTMSG: 849 err = ip_rt_ioctl(net, cmd, (void __user *)arg); 850 break; 851 case SIOCDARP: 852 case SIOCGARP: 853 case SIOCSARP: 854 err = arp_ioctl(net, cmd, (void __user *)arg); 855 break; 856 case SIOCGIFADDR: 857 case SIOCSIFADDR: 858 case SIOCGIFBRDADDR: 859 case SIOCSIFBRDADDR: 860 case SIOCGIFNETMASK: 861 case SIOCSIFNETMASK: 862 case SIOCGIFDSTADDR: 863 case SIOCSIFDSTADDR: 864 case SIOCSIFPFLAGS: 865 case SIOCGIFPFLAGS: 866 case SIOCSIFFLAGS: 867 err = devinet_ioctl(net, cmd, (void __user *)arg); 868 break; 869 default: 870 if (sk->sk_prot->ioctl) 871 err = sk->sk_prot->ioctl(sk, cmd, arg); 872 else 873 err = -ENOIOCTLCMD; 874 break; 875 } 876 return err; 877 } 878 EXPORT_SYMBOL(inet_ioctl); 879 880 const struct proto_ops inet_stream_ops = { 881 .family = PF_INET, 882 .owner = THIS_MODULE, 883 .release = inet_release, 884 .bind = inet_bind, 885 .connect = inet_stream_connect, 886 .socketpair = sock_no_socketpair, 887 .accept = inet_accept, 888 .getname = inet_getname, 889 .poll = tcp_poll, 890 .ioctl = inet_ioctl, 891 .listen = inet_listen, 892 .shutdown = inet_shutdown, 893 .setsockopt = sock_common_setsockopt, 894 .getsockopt = sock_common_getsockopt, 895 .sendmsg = tcp_sendmsg, 896 .recvmsg = inet_recvmsg, 897 .mmap = sock_no_mmap, 898 .sendpage = tcp_sendpage, 899 .splice_read = tcp_splice_read, 900 #ifdef CONFIG_COMPAT 901 .compat_setsockopt = compat_sock_common_setsockopt, 902 .compat_getsockopt = compat_sock_common_getsockopt, 903 #endif 904 }; 905 EXPORT_SYMBOL(inet_stream_ops); 906 907 const struct proto_ops inet_dgram_ops = { 908 .family = PF_INET, 909 .owner = THIS_MODULE, 910 .release = inet_release, 911 .bind = inet_bind, 912 .connect = inet_dgram_connect, 913 .socketpair = sock_no_socketpair, 914 .accept = sock_no_accept, 915 .getname = inet_getname, 916 .poll = udp_poll, 917 .ioctl = inet_ioctl, 918 .listen = sock_no_listen, 919 .shutdown = inet_shutdown, 920 .setsockopt = sock_common_setsockopt, 921 .getsockopt = sock_common_getsockopt, 922 .sendmsg = inet_sendmsg, 923 .recvmsg = inet_recvmsg, 924 .mmap = sock_no_mmap, 925 .sendpage = inet_sendpage, 926 #ifdef CONFIG_COMPAT 927 .compat_setsockopt = compat_sock_common_setsockopt, 928 .compat_getsockopt = compat_sock_common_getsockopt, 929 #endif 930 }; 931 EXPORT_SYMBOL(inet_dgram_ops); 932 933 /* 934 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 935 * udp_poll 936 */ 937 static const struct proto_ops inet_sockraw_ops = { 938 .family = PF_INET, 939 .owner = THIS_MODULE, 940 .release = inet_release, 941 .bind = inet_bind, 942 .connect = inet_dgram_connect, 943 .socketpair = sock_no_socketpair, 944 .accept = sock_no_accept, 945 .getname = inet_getname, 946 .poll = datagram_poll, 947 .ioctl = inet_ioctl, 948 .listen = sock_no_listen, 949 .shutdown = inet_shutdown, 950 .setsockopt = sock_common_setsockopt, 951 .getsockopt = sock_common_getsockopt, 952 .sendmsg = inet_sendmsg, 953 .recvmsg = inet_recvmsg, 954 .mmap = sock_no_mmap, 955 .sendpage = inet_sendpage, 956 #ifdef CONFIG_COMPAT 957 .compat_setsockopt = compat_sock_common_setsockopt, 958 .compat_getsockopt = compat_sock_common_getsockopt, 959 #endif 960 }; 961 962 static const struct net_proto_family inet_family_ops = { 963 .family = PF_INET, 964 .create = inet_create, 965 .owner = THIS_MODULE, 966 }; 967 968 /* Upon startup we insert all the elements in inetsw_array[] into 969 * the linked list inetsw. 970 */ 971 static struct inet_protosw inetsw_array[] = 972 { 973 { 974 .type = SOCK_STREAM, 975 .protocol = IPPROTO_TCP, 976 .prot = &tcp_prot, 977 .ops = &inet_stream_ops, 978 .no_check = 0, 979 .flags = INET_PROTOSW_PERMANENT | 980 INET_PROTOSW_ICSK, 981 }, 982 983 { 984 .type = SOCK_DGRAM, 985 .protocol = IPPROTO_UDP, 986 .prot = &udp_prot, 987 .ops = &inet_dgram_ops, 988 .no_check = UDP_CSUM_DEFAULT, 989 .flags = INET_PROTOSW_PERMANENT, 990 }, 991 992 993 { 994 .type = SOCK_RAW, 995 .protocol = IPPROTO_IP, /* wild card */ 996 .prot = &raw_prot, 997 .ops = &inet_sockraw_ops, 998 .no_check = UDP_CSUM_DEFAULT, 999 .flags = INET_PROTOSW_REUSE, 1000 } 1001 }; 1002 1003 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) 1004 1005 void inet_register_protosw(struct inet_protosw *p) 1006 { 1007 struct list_head *lh; 1008 struct inet_protosw *answer; 1009 int protocol = p->protocol; 1010 struct list_head *last_perm; 1011 1012 spin_lock_bh(&inetsw_lock); 1013 1014 if (p->type >= SOCK_MAX) 1015 goto out_illegal; 1016 1017 /* If we are trying to override a permanent protocol, bail. */ 1018 answer = NULL; 1019 last_perm = &inetsw[p->type]; 1020 list_for_each(lh, &inetsw[p->type]) { 1021 answer = list_entry(lh, struct inet_protosw, list); 1022 1023 /* Check only the non-wild match. */ 1024 if (INET_PROTOSW_PERMANENT & answer->flags) { 1025 if (protocol == answer->protocol) 1026 break; 1027 last_perm = lh; 1028 } 1029 1030 answer = NULL; 1031 } 1032 if (answer) 1033 goto out_permanent; 1034 1035 /* Add the new entry after the last permanent entry if any, so that 1036 * the new entry does not override a permanent entry when matched with 1037 * a wild-card protocol. But it is allowed to override any existing 1038 * non-permanent entry. This means that when we remove this entry, the 1039 * system automatically returns to the old behavior. 1040 */ 1041 list_add_rcu(&p->list, last_perm); 1042 out: 1043 spin_unlock_bh(&inetsw_lock); 1044 1045 return; 1046 1047 out_permanent: 1048 printk(KERN_ERR "Attempt to override permanent protocol %d.\n", 1049 protocol); 1050 goto out; 1051 1052 out_illegal: 1053 printk(KERN_ERR 1054 "Ignoring attempt to register invalid socket type %d.\n", 1055 p->type); 1056 goto out; 1057 } 1058 EXPORT_SYMBOL(inet_register_protosw); 1059 1060 void inet_unregister_protosw(struct inet_protosw *p) 1061 { 1062 if (INET_PROTOSW_PERMANENT & p->flags) { 1063 printk(KERN_ERR 1064 "Attempt to unregister permanent protocol %d.\n", 1065 p->protocol); 1066 } else { 1067 spin_lock_bh(&inetsw_lock); 1068 list_del_rcu(&p->list); 1069 spin_unlock_bh(&inetsw_lock); 1070 1071 synchronize_net(); 1072 } 1073 } 1074 EXPORT_SYMBOL(inet_unregister_protosw); 1075 1076 /* 1077 * Shall we try to damage output packets if routing dev changes? 1078 */ 1079 1080 int sysctl_ip_dynaddr __read_mostly; 1081 1082 static int inet_sk_reselect_saddr(struct sock *sk) 1083 { 1084 struct inet_sock *inet = inet_sk(sk); 1085 int err; 1086 struct rtable *rt; 1087 __be32 old_saddr = inet->inet_saddr; 1088 __be32 new_saddr; 1089 __be32 daddr = inet->inet_daddr; 1090 1091 if (inet->opt && inet->opt->srr) 1092 daddr = inet->opt->faddr; 1093 1094 /* Query new route. */ 1095 err = ip_route_connect(&rt, daddr, 0, 1096 RT_CONN_FLAGS(sk), 1097 sk->sk_bound_dev_if, 1098 sk->sk_protocol, 1099 inet->inet_sport, inet->inet_dport, sk, 0); 1100 if (err) 1101 return err; 1102 1103 sk_setup_caps(sk, &rt->u.dst); 1104 1105 new_saddr = rt->rt_src; 1106 1107 if (new_saddr == old_saddr) 1108 return 0; 1109 1110 if (sysctl_ip_dynaddr > 1) { 1111 printk(KERN_INFO "%s(): shifting inet->saddr from %pI4 to %pI4\n", 1112 __func__, &old_saddr, &new_saddr); 1113 } 1114 1115 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr; 1116 1117 /* 1118 * XXX The only one ugly spot where we need to 1119 * XXX really change the sockets identity after 1120 * XXX it has entered the hashes. -DaveM 1121 * 1122 * Besides that, it does not check for connection 1123 * uniqueness. Wait for troubles. 1124 */ 1125 __sk_prot_rehash(sk); 1126 return 0; 1127 } 1128 1129 int inet_sk_rebuild_header(struct sock *sk) 1130 { 1131 struct inet_sock *inet = inet_sk(sk); 1132 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); 1133 __be32 daddr; 1134 int err; 1135 1136 /* Route is OK, nothing to do. */ 1137 if (rt) 1138 return 0; 1139 1140 /* Reroute. */ 1141 daddr = inet->inet_daddr; 1142 if (inet->opt && inet->opt->srr) 1143 daddr = inet->opt->faddr; 1144 { 1145 struct flowi fl = { 1146 .oif = sk->sk_bound_dev_if, 1147 .mark = sk->sk_mark, 1148 .nl_u = { 1149 .ip4_u = { 1150 .daddr = daddr, 1151 .saddr = inet->inet_saddr, 1152 .tos = RT_CONN_FLAGS(sk), 1153 }, 1154 }, 1155 .proto = sk->sk_protocol, 1156 .flags = inet_sk_flowi_flags(sk), 1157 .uli_u = { 1158 .ports = { 1159 .sport = inet->inet_sport, 1160 .dport = inet->inet_dport, 1161 }, 1162 }, 1163 }; 1164 1165 security_sk_classify_flow(sk, &fl); 1166 err = ip_route_output_flow(sock_net(sk), &rt, &fl, sk, 0); 1167 } 1168 if (!err) 1169 sk_setup_caps(sk, &rt->u.dst); 1170 else { 1171 /* Routing failed... */ 1172 sk->sk_route_caps = 0; 1173 /* 1174 * Other protocols have to map its equivalent state to TCP_SYN_SENT. 1175 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme 1176 */ 1177 if (!sysctl_ip_dynaddr || 1178 sk->sk_state != TCP_SYN_SENT || 1179 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 1180 (err = inet_sk_reselect_saddr(sk)) != 0) 1181 sk->sk_err_soft = -err; 1182 } 1183 1184 return err; 1185 } 1186 EXPORT_SYMBOL(inet_sk_rebuild_header); 1187 1188 static int inet_gso_send_check(struct sk_buff *skb) 1189 { 1190 struct iphdr *iph; 1191 const struct net_protocol *ops; 1192 int proto; 1193 int ihl; 1194 int err = -EINVAL; 1195 1196 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1197 goto out; 1198 1199 iph = ip_hdr(skb); 1200 ihl = iph->ihl * 4; 1201 if (ihl < sizeof(*iph)) 1202 goto out; 1203 1204 if (unlikely(!pskb_may_pull(skb, ihl))) 1205 goto out; 1206 1207 __skb_pull(skb, ihl); 1208 skb_reset_transport_header(skb); 1209 iph = ip_hdr(skb); 1210 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1211 err = -EPROTONOSUPPORT; 1212 1213 rcu_read_lock(); 1214 ops = rcu_dereference(inet_protos[proto]); 1215 if (likely(ops && ops->gso_send_check)) 1216 err = ops->gso_send_check(skb); 1217 rcu_read_unlock(); 1218 1219 out: 1220 return err; 1221 } 1222 1223 static struct sk_buff *inet_gso_segment(struct sk_buff *skb, int features) 1224 { 1225 struct sk_buff *segs = ERR_PTR(-EINVAL); 1226 struct iphdr *iph; 1227 const struct net_protocol *ops; 1228 int proto; 1229 int ihl; 1230 int id; 1231 unsigned int offset = 0; 1232 1233 if (!(features & NETIF_F_V4_CSUM)) 1234 features &= ~NETIF_F_SG; 1235 1236 if (unlikely(skb_shinfo(skb)->gso_type & 1237 ~(SKB_GSO_TCPV4 | 1238 SKB_GSO_UDP | 1239 SKB_GSO_DODGY | 1240 SKB_GSO_TCP_ECN | 1241 0))) 1242 goto out; 1243 1244 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1245 goto out; 1246 1247 iph = ip_hdr(skb); 1248 ihl = iph->ihl * 4; 1249 if (ihl < sizeof(*iph)) 1250 goto out; 1251 1252 if (unlikely(!pskb_may_pull(skb, ihl))) 1253 goto out; 1254 1255 __skb_pull(skb, ihl); 1256 skb_reset_transport_header(skb); 1257 iph = ip_hdr(skb); 1258 id = ntohs(iph->id); 1259 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1260 segs = ERR_PTR(-EPROTONOSUPPORT); 1261 1262 rcu_read_lock(); 1263 ops = rcu_dereference(inet_protos[proto]); 1264 if (likely(ops && ops->gso_segment)) 1265 segs = ops->gso_segment(skb, features); 1266 rcu_read_unlock(); 1267 1268 if (!segs || IS_ERR(segs)) 1269 goto out; 1270 1271 skb = segs; 1272 do { 1273 iph = ip_hdr(skb); 1274 if (proto == IPPROTO_UDP) { 1275 iph->id = htons(id); 1276 iph->frag_off = htons(offset >> 3); 1277 if (skb->next != NULL) 1278 iph->frag_off |= htons(IP_MF); 1279 offset += (skb->len - skb->mac_len - iph->ihl * 4); 1280 } else 1281 iph->id = htons(id++); 1282 iph->tot_len = htons(skb->len - skb->mac_len); 1283 iph->check = 0; 1284 iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl); 1285 } while ((skb = skb->next)); 1286 1287 out: 1288 return segs; 1289 } 1290 1291 static struct sk_buff **inet_gro_receive(struct sk_buff **head, 1292 struct sk_buff *skb) 1293 { 1294 const struct net_protocol *ops; 1295 struct sk_buff **pp = NULL; 1296 struct sk_buff *p; 1297 struct iphdr *iph; 1298 unsigned int hlen; 1299 unsigned int off; 1300 unsigned int id; 1301 int flush = 1; 1302 int proto; 1303 1304 off = skb_gro_offset(skb); 1305 hlen = off + sizeof(*iph); 1306 iph = skb_gro_header_fast(skb, off); 1307 if (skb_gro_header_hard(skb, hlen)) { 1308 iph = skb_gro_header_slow(skb, hlen, off); 1309 if (unlikely(!iph)) 1310 goto out; 1311 } 1312 1313 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1314 1315 rcu_read_lock(); 1316 ops = rcu_dereference(inet_protos[proto]); 1317 if (!ops || !ops->gro_receive) 1318 goto out_unlock; 1319 1320 if (*(u8 *)iph != 0x45) 1321 goto out_unlock; 1322 1323 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) 1324 goto out_unlock; 1325 1326 id = ntohl(*(__be32 *)&iph->id); 1327 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id ^ IP_DF)); 1328 id >>= 16; 1329 1330 for (p = *head; p; p = p->next) { 1331 struct iphdr *iph2; 1332 1333 if (!NAPI_GRO_CB(p)->same_flow) 1334 continue; 1335 1336 iph2 = ip_hdr(p); 1337 1338 if ((iph->protocol ^ iph2->protocol) | 1339 (iph->tos ^ iph2->tos) | 1340 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) | 1341 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) { 1342 NAPI_GRO_CB(p)->same_flow = 0; 1343 continue; 1344 } 1345 1346 /* All fields must match except length and checksum. */ 1347 NAPI_GRO_CB(p)->flush |= 1348 (iph->ttl ^ iph2->ttl) | 1349 ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id); 1350 1351 NAPI_GRO_CB(p)->flush |= flush; 1352 } 1353 1354 NAPI_GRO_CB(skb)->flush |= flush; 1355 skb_gro_pull(skb, sizeof(*iph)); 1356 skb_set_transport_header(skb, skb_gro_offset(skb)); 1357 1358 pp = ops->gro_receive(head, skb); 1359 1360 out_unlock: 1361 rcu_read_unlock(); 1362 1363 out: 1364 NAPI_GRO_CB(skb)->flush |= flush; 1365 1366 return pp; 1367 } 1368 1369 static int inet_gro_complete(struct sk_buff *skb) 1370 { 1371 const struct net_protocol *ops; 1372 struct iphdr *iph = ip_hdr(skb); 1373 int proto = iph->protocol & (MAX_INET_PROTOS - 1); 1374 int err = -ENOSYS; 1375 __be16 newlen = htons(skb->len - skb_network_offset(skb)); 1376 1377 csum_replace2(&iph->check, iph->tot_len, newlen); 1378 iph->tot_len = newlen; 1379 1380 rcu_read_lock(); 1381 ops = rcu_dereference(inet_protos[proto]); 1382 if (WARN_ON(!ops || !ops->gro_complete)) 1383 goto out_unlock; 1384 1385 err = ops->gro_complete(skb); 1386 1387 out_unlock: 1388 rcu_read_unlock(); 1389 1390 return err; 1391 } 1392 1393 int inet_ctl_sock_create(struct sock **sk, unsigned short family, 1394 unsigned short type, unsigned char protocol, 1395 struct net *net) 1396 { 1397 struct socket *sock; 1398 int rc = sock_create_kern(family, type, protocol, &sock); 1399 1400 if (rc == 0) { 1401 *sk = sock->sk; 1402 (*sk)->sk_allocation = GFP_ATOMIC; 1403 /* 1404 * Unhash it so that IP input processing does not even see it, 1405 * we do not wish this socket to see incoming packets. 1406 */ 1407 (*sk)->sk_prot->unhash(*sk); 1408 1409 sk_change_net(*sk, net); 1410 } 1411 return rc; 1412 } 1413 EXPORT_SYMBOL_GPL(inet_ctl_sock_create); 1414 1415 unsigned long snmp_fold_field(void __percpu *mib[], int offt) 1416 { 1417 unsigned long res = 0; 1418 int i; 1419 1420 for_each_possible_cpu(i) { 1421 res += *(((unsigned long *) per_cpu_ptr(mib[0], i)) + offt); 1422 res += *(((unsigned long *) per_cpu_ptr(mib[1], i)) + offt); 1423 } 1424 return res; 1425 } 1426 EXPORT_SYMBOL_GPL(snmp_fold_field); 1427 1428 int snmp_mib_init(void __percpu *ptr[2], size_t mibsize) 1429 { 1430 BUG_ON(ptr == NULL); 1431 ptr[0] = __alloc_percpu(mibsize, __alignof__(unsigned long)); 1432 if (!ptr[0]) 1433 goto err0; 1434 ptr[1] = __alloc_percpu(mibsize, __alignof__(unsigned long)); 1435 if (!ptr[1]) 1436 goto err1; 1437 return 0; 1438 err1: 1439 free_percpu(ptr[0]); 1440 ptr[0] = NULL; 1441 err0: 1442 return -ENOMEM; 1443 } 1444 EXPORT_SYMBOL_GPL(snmp_mib_init); 1445 1446 void snmp_mib_free(void __percpu *ptr[2]) 1447 { 1448 BUG_ON(ptr == NULL); 1449 free_percpu(ptr[0]); 1450 free_percpu(ptr[1]); 1451 ptr[0] = ptr[1] = NULL; 1452 } 1453 EXPORT_SYMBOL_GPL(snmp_mib_free); 1454 1455 #ifdef CONFIG_IP_MULTICAST 1456 static const struct net_protocol igmp_protocol = { 1457 .handler = igmp_rcv, 1458 .netns_ok = 1, 1459 }; 1460 #endif 1461 1462 static const struct net_protocol tcp_protocol = { 1463 .handler = tcp_v4_rcv, 1464 .err_handler = tcp_v4_err, 1465 .gso_send_check = tcp_v4_gso_send_check, 1466 .gso_segment = tcp_tso_segment, 1467 .gro_receive = tcp4_gro_receive, 1468 .gro_complete = tcp4_gro_complete, 1469 .no_policy = 1, 1470 .netns_ok = 1, 1471 }; 1472 1473 static const struct net_protocol udp_protocol = { 1474 .handler = udp_rcv, 1475 .err_handler = udp_err, 1476 .gso_send_check = udp4_ufo_send_check, 1477 .gso_segment = udp4_ufo_fragment, 1478 .no_policy = 1, 1479 .netns_ok = 1, 1480 }; 1481 1482 static const struct net_protocol icmp_protocol = { 1483 .handler = icmp_rcv, 1484 .no_policy = 1, 1485 .netns_ok = 1, 1486 }; 1487 1488 static __net_init int ipv4_mib_init_net(struct net *net) 1489 { 1490 if (snmp_mib_init((void __percpu **)net->mib.tcp_statistics, 1491 sizeof(struct tcp_mib)) < 0) 1492 goto err_tcp_mib; 1493 if (snmp_mib_init((void __percpu **)net->mib.ip_statistics, 1494 sizeof(struct ipstats_mib)) < 0) 1495 goto err_ip_mib; 1496 if (snmp_mib_init((void __percpu **)net->mib.net_statistics, 1497 sizeof(struct linux_mib)) < 0) 1498 goto err_net_mib; 1499 if (snmp_mib_init((void __percpu **)net->mib.udp_statistics, 1500 sizeof(struct udp_mib)) < 0) 1501 goto err_udp_mib; 1502 if (snmp_mib_init((void __percpu **)net->mib.udplite_statistics, 1503 sizeof(struct udp_mib)) < 0) 1504 goto err_udplite_mib; 1505 if (snmp_mib_init((void __percpu **)net->mib.icmp_statistics, 1506 sizeof(struct icmp_mib)) < 0) 1507 goto err_icmp_mib; 1508 if (snmp_mib_init((void __percpu **)net->mib.icmpmsg_statistics, 1509 sizeof(struct icmpmsg_mib)) < 0) 1510 goto err_icmpmsg_mib; 1511 1512 tcp_mib_init(net); 1513 return 0; 1514 1515 err_icmpmsg_mib: 1516 snmp_mib_free((void __percpu **)net->mib.icmp_statistics); 1517 err_icmp_mib: 1518 snmp_mib_free((void __percpu **)net->mib.udplite_statistics); 1519 err_udplite_mib: 1520 snmp_mib_free((void __percpu **)net->mib.udp_statistics); 1521 err_udp_mib: 1522 snmp_mib_free((void __percpu **)net->mib.net_statistics); 1523 err_net_mib: 1524 snmp_mib_free((void __percpu **)net->mib.ip_statistics); 1525 err_ip_mib: 1526 snmp_mib_free((void __percpu **)net->mib.tcp_statistics); 1527 err_tcp_mib: 1528 return -ENOMEM; 1529 } 1530 1531 static __net_exit void ipv4_mib_exit_net(struct net *net) 1532 { 1533 snmp_mib_free((void __percpu **)net->mib.icmpmsg_statistics); 1534 snmp_mib_free((void __percpu **)net->mib.icmp_statistics); 1535 snmp_mib_free((void __percpu **)net->mib.udplite_statistics); 1536 snmp_mib_free((void __percpu **)net->mib.udp_statistics); 1537 snmp_mib_free((void __percpu **)net->mib.net_statistics); 1538 snmp_mib_free((void __percpu **)net->mib.ip_statistics); 1539 snmp_mib_free((void __percpu **)net->mib.tcp_statistics); 1540 } 1541 1542 static __net_initdata struct pernet_operations ipv4_mib_ops = { 1543 .init = ipv4_mib_init_net, 1544 .exit = ipv4_mib_exit_net, 1545 }; 1546 1547 static int __init init_ipv4_mibs(void) 1548 { 1549 return register_pernet_subsys(&ipv4_mib_ops); 1550 } 1551 1552 static int ipv4_proc_init(void); 1553 1554 /* 1555 * IP protocol layer initialiser 1556 */ 1557 1558 static struct packet_type ip_packet_type __read_mostly = { 1559 .type = cpu_to_be16(ETH_P_IP), 1560 .func = ip_rcv, 1561 .gso_send_check = inet_gso_send_check, 1562 .gso_segment = inet_gso_segment, 1563 .gro_receive = inet_gro_receive, 1564 .gro_complete = inet_gro_complete, 1565 }; 1566 1567 static int __init inet_init(void) 1568 { 1569 struct sk_buff *dummy_skb; 1570 struct inet_protosw *q; 1571 struct list_head *r; 1572 int rc = -EINVAL; 1573 1574 BUILD_BUG_ON(sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb)); 1575 1576 sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL); 1577 if (!sysctl_local_reserved_ports) 1578 goto out; 1579 1580 rc = proto_register(&tcp_prot, 1); 1581 if (rc) 1582 goto out_free_reserved_ports; 1583 1584 rc = proto_register(&udp_prot, 1); 1585 if (rc) 1586 goto out_unregister_tcp_proto; 1587 1588 rc = proto_register(&raw_prot, 1); 1589 if (rc) 1590 goto out_unregister_udp_proto; 1591 1592 /* 1593 * Tell SOCKET that we are alive... 1594 */ 1595 1596 (void)sock_register(&inet_family_ops); 1597 1598 #ifdef CONFIG_SYSCTL 1599 ip_static_sysctl_init(); 1600 #endif 1601 1602 /* 1603 * Add all the base protocols. 1604 */ 1605 1606 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 1607 printk(KERN_CRIT "inet_init: Cannot add ICMP protocol\n"); 1608 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) 1609 printk(KERN_CRIT "inet_init: Cannot add UDP protocol\n"); 1610 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) 1611 printk(KERN_CRIT "inet_init: Cannot add TCP protocol\n"); 1612 #ifdef CONFIG_IP_MULTICAST 1613 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 1614 printk(KERN_CRIT "inet_init: Cannot add IGMP protocol\n"); 1615 #endif 1616 1617 /* Register the socket-side information for inet_create. */ 1618 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 1619 INIT_LIST_HEAD(r); 1620 1621 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 1622 inet_register_protosw(q); 1623 1624 /* 1625 * Set the ARP module up 1626 */ 1627 1628 arp_init(); 1629 1630 /* 1631 * Set the IP module up 1632 */ 1633 1634 ip_init(); 1635 1636 tcp_v4_init(); 1637 1638 /* Setup TCP slab cache for open requests. */ 1639 tcp_init(); 1640 1641 /* Setup UDP memory threshold */ 1642 udp_init(); 1643 1644 /* Add UDP-Lite (RFC 3828) */ 1645 udplite4_register(); 1646 1647 /* 1648 * Set the ICMP layer up 1649 */ 1650 1651 if (icmp_init() < 0) 1652 panic("Failed to create the ICMP control socket.\n"); 1653 1654 /* 1655 * Initialise the multicast router 1656 */ 1657 #if defined(CONFIG_IP_MROUTE) 1658 if (ip_mr_init()) 1659 printk(KERN_CRIT "inet_init: Cannot init ipv4 mroute\n"); 1660 #endif 1661 /* 1662 * Initialise per-cpu ipv4 mibs 1663 */ 1664 1665 if (init_ipv4_mibs()) 1666 printk(KERN_CRIT "inet_init: Cannot init ipv4 mibs\n"); 1667 1668 ipv4_proc_init(); 1669 1670 ipfrag_init(); 1671 1672 dev_add_pack(&ip_packet_type); 1673 1674 rc = 0; 1675 out: 1676 return rc; 1677 out_unregister_udp_proto: 1678 proto_unregister(&udp_prot); 1679 out_unregister_tcp_proto: 1680 proto_unregister(&tcp_prot); 1681 out_free_reserved_ports: 1682 kfree(sysctl_local_reserved_ports); 1683 goto out; 1684 } 1685 1686 fs_initcall(inet_init); 1687 1688 /* ------------------------------------------------------------------------ */ 1689 1690 #ifdef CONFIG_PROC_FS 1691 static int __init ipv4_proc_init(void) 1692 { 1693 int rc = 0; 1694 1695 if (raw_proc_init()) 1696 goto out_raw; 1697 if (tcp4_proc_init()) 1698 goto out_tcp; 1699 if (udp4_proc_init()) 1700 goto out_udp; 1701 if (ip_misc_proc_init()) 1702 goto out_misc; 1703 out: 1704 return rc; 1705 out_misc: 1706 udp4_proc_exit(); 1707 out_udp: 1708 tcp4_proc_exit(); 1709 out_tcp: 1710 raw_proc_exit(); 1711 out_raw: 1712 rc = -ENOMEM; 1713 goto out; 1714 } 1715 1716 #else /* CONFIG_PROC_FS */ 1717 static int __init ipv4_proc_init(void) 1718 { 1719 return 0; 1720 } 1721 #endif /* CONFIG_PROC_FS */ 1722 1723 MODULE_ALIAS_NETPROTO(PF_INET); 1724 1725