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 */ 231 void build_ehash_secret(void) 232 { 233 u32 rnd; 234 235 do { 236 get_random_bytes(&rnd, sizeof(rnd)); 237 } while (rnd == 0); 238 239 cmpxchg(&inet_ehash_secret, 0, rnd); 240 } 241 EXPORT_SYMBOL(build_ehash_secret); 242 243 static inline int inet_netns_ok(struct net *net, int protocol) 244 { 245 int hash; 246 const struct net_protocol *ipprot; 247 248 if (net_eq(net, &init_net)) 249 return 1; 250 251 hash = protocol & (MAX_INET_PROTOS - 1); 252 ipprot = rcu_dereference(inet_protos[hash]); 253 254 if (ipprot == NULL) 255 /* raw IP is OK */ 256 return 1; 257 return ipprot->netns_ok; 258 } 259 260 /* 261 * Create an inet socket. 262 */ 263 264 static int inet_create(struct net *net, struct socket *sock, int protocol, 265 int kern) 266 { 267 struct sock *sk; 268 struct inet_protosw *answer; 269 struct inet_sock *inet; 270 struct proto *answer_prot; 271 unsigned char answer_flags; 272 char answer_no_check; 273 int try_loading_module = 0; 274 int err; 275 276 if (unlikely(!inet_ehash_secret)) 277 if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM) 278 build_ehash_secret(); 279 280 sock->state = SS_UNCONNECTED; 281 282 /* Look for the requested type/protocol pair. */ 283 lookup_protocol: 284 err = -ESOCKTNOSUPPORT; 285 rcu_read_lock(); 286 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) { 287 288 err = 0; 289 /* Check the non-wild match. */ 290 if (protocol == answer->protocol) { 291 if (protocol != IPPROTO_IP) 292 break; 293 } else { 294 /* Check for the two wild cases. */ 295 if (IPPROTO_IP == protocol) { 296 protocol = answer->protocol; 297 break; 298 } 299 if (IPPROTO_IP == answer->protocol) 300 break; 301 } 302 err = -EPROTONOSUPPORT; 303 } 304 305 if (unlikely(err)) { 306 if (try_loading_module < 2) { 307 rcu_read_unlock(); 308 /* 309 * Be more specific, e.g. net-pf-2-proto-132-type-1 310 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) 311 */ 312 if (++try_loading_module == 1) 313 request_module("net-pf-%d-proto-%d-type-%d", 314 PF_INET, protocol, sock->type); 315 /* 316 * Fall back to generic, e.g. net-pf-2-proto-132 317 * (net-pf-PF_INET-proto-IPPROTO_SCTP) 318 */ 319 else 320 request_module("net-pf-%d-proto-%d", 321 PF_INET, protocol); 322 goto lookup_protocol; 323 } else 324 goto out_rcu_unlock; 325 } 326 327 err = -EPERM; 328 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW)) 329 goto out_rcu_unlock; 330 331 err = -EAFNOSUPPORT; 332 if (!inet_netns_ok(net, protocol)) 333 goto out_rcu_unlock; 334 335 sock->ops = answer->ops; 336 answer_prot = answer->prot; 337 answer_no_check = answer->no_check; 338 answer_flags = answer->flags; 339 rcu_read_unlock(); 340 341 WARN_ON(answer_prot->slab == NULL); 342 343 err = -ENOBUFS; 344 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot); 345 if (sk == NULL) 346 goto out; 347 348 err = 0; 349 sk->sk_no_check = answer_no_check; 350 if (INET_PROTOSW_REUSE & answer_flags) 351 sk->sk_reuse = 1; 352 353 inet = inet_sk(sk); 354 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 355 356 inet->nodefrag = 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 && !sk->sk_prot->no_autobind && 729 inet_autobind(sk)) 730 return -EAGAIN; 731 732 return sk->sk_prot->sendmsg(iocb, sk, msg, size); 733 } 734 EXPORT_SYMBOL(inet_sendmsg); 735 736 ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, 737 size_t size, int flags) 738 { 739 struct sock *sk = sock->sk; 740 741 sock_rps_record_flow(sk); 742 743 /* We may need to bind the socket. */ 744 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 745 inet_autobind(sk)) 746 return -EAGAIN; 747 748 if (sk->sk_prot->sendpage) 749 return sk->sk_prot->sendpage(sk, page, offset, size, flags); 750 return sock_no_sendpage(sock, page, offset, size, flags); 751 } 752 EXPORT_SYMBOL(inet_sendpage); 753 754 int inet_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 755 size_t size, int flags) 756 { 757 struct sock *sk = sock->sk; 758 int addr_len = 0; 759 int err; 760 761 sock_rps_record_flow(sk); 762 763 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, 764 flags & ~MSG_DONTWAIT, &addr_len); 765 if (err >= 0) 766 msg->msg_namelen = addr_len; 767 return err; 768 } 769 EXPORT_SYMBOL(inet_recvmsg); 770 771 int inet_shutdown(struct socket *sock, int how) 772 { 773 struct sock *sk = sock->sk; 774 int err = 0; 775 776 /* This should really check to make sure 777 * the socket is a TCP socket. (WHY AC...) 778 */ 779 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and 780 1->2 bit 2 snds. 781 2->3 */ 782 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ 783 return -EINVAL; 784 785 lock_sock(sk); 786 if (sock->state == SS_CONNECTING) { 787 if ((1 << sk->sk_state) & 788 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) 789 sock->state = SS_DISCONNECTING; 790 else 791 sock->state = SS_CONNECTED; 792 } 793 794 switch (sk->sk_state) { 795 case TCP_CLOSE: 796 err = -ENOTCONN; 797 /* Hack to wake up other listeners, who can poll for 798 POLLHUP, even on eg. unconnected UDP sockets -- RR */ 799 default: 800 sk->sk_shutdown |= how; 801 if (sk->sk_prot->shutdown) 802 sk->sk_prot->shutdown(sk, how); 803 break; 804 805 /* Remaining two branches are temporary solution for missing 806 * close() in multithreaded environment. It is _not_ a good idea, 807 * but we have no choice until close() is repaired at VFS level. 808 */ 809 case TCP_LISTEN: 810 if (!(how & RCV_SHUTDOWN)) 811 break; 812 /* Fall through */ 813 case TCP_SYN_SENT: 814 err = sk->sk_prot->disconnect(sk, O_NONBLOCK); 815 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 816 break; 817 } 818 819 /* Wake up anyone sleeping in poll. */ 820 sk->sk_state_change(sk); 821 release_sock(sk); 822 return err; 823 } 824 EXPORT_SYMBOL(inet_shutdown); 825 826 /* 827 * ioctl() calls you can issue on an INET socket. Most of these are 828 * device configuration and stuff and very rarely used. Some ioctls 829 * pass on to the socket itself. 830 * 831 * NOTE: I like the idea of a module for the config stuff. ie ifconfig 832 * loads the devconfigure module does its configuring and unloads it. 833 * There's a good 20K of config code hanging around the kernel. 834 */ 835 836 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 837 { 838 struct sock *sk = sock->sk; 839 int err = 0; 840 struct net *net = sock_net(sk); 841 842 switch (cmd) { 843 case SIOCGSTAMP: 844 err = sock_get_timestamp(sk, (struct timeval __user *)arg); 845 break; 846 case SIOCGSTAMPNS: 847 err = sock_get_timestampns(sk, (struct timespec __user *)arg); 848 break; 849 case SIOCADDRT: 850 case SIOCDELRT: 851 case SIOCRTMSG: 852 err = ip_rt_ioctl(net, cmd, (void __user *)arg); 853 break; 854 case SIOCDARP: 855 case SIOCGARP: 856 case SIOCSARP: 857 err = arp_ioctl(net, cmd, (void __user *)arg); 858 break; 859 case SIOCGIFADDR: 860 case SIOCSIFADDR: 861 case SIOCGIFBRDADDR: 862 case SIOCSIFBRDADDR: 863 case SIOCGIFNETMASK: 864 case SIOCSIFNETMASK: 865 case SIOCGIFDSTADDR: 866 case SIOCSIFDSTADDR: 867 case SIOCSIFPFLAGS: 868 case SIOCGIFPFLAGS: 869 case SIOCSIFFLAGS: 870 err = devinet_ioctl(net, cmd, (void __user *)arg); 871 break; 872 default: 873 if (sk->sk_prot->ioctl) 874 err = sk->sk_prot->ioctl(sk, cmd, arg); 875 else 876 err = -ENOIOCTLCMD; 877 break; 878 } 879 return err; 880 } 881 EXPORT_SYMBOL(inet_ioctl); 882 883 const struct proto_ops inet_stream_ops = { 884 .family = PF_INET, 885 .owner = THIS_MODULE, 886 .release = inet_release, 887 .bind = inet_bind, 888 .connect = inet_stream_connect, 889 .socketpair = sock_no_socketpair, 890 .accept = inet_accept, 891 .getname = inet_getname, 892 .poll = tcp_poll, 893 .ioctl = inet_ioctl, 894 .listen = inet_listen, 895 .shutdown = inet_shutdown, 896 .setsockopt = sock_common_setsockopt, 897 .getsockopt = sock_common_getsockopt, 898 .sendmsg = inet_sendmsg, 899 .recvmsg = inet_recvmsg, 900 .mmap = sock_no_mmap, 901 .sendpage = inet_sendpage, 902 .splice_read = tcp_splice_read, 903 #ifdef CONFIG_COMPAT 904 .compat_setsockopt = compat_sock_common_setsockopt, 905 .compat_getsockopt = compat_sock_common_getsockopt, 906 #endif 907 }; 908 EXPORT_SYMBOL(inet_stream_ops); 909 910 const struct proto_ops inet_dgram_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 = udp_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 = inet_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 EXPORT_SYMBOL(inet_dgram_ops); 935 936 /* 937 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 938 * udp_poll 939 */ 940 static const struct proto_ops inet_sockraw_ops = { 941 .family = PF_INET, 942 .owner = THIS_MODULE, 943 .release = inet_release, 944 .bind = inet_bind, 945 .connect = inet_dgram_connect, 946 .socketpair = sock_no_socketpair, 947 .accept = sock_no_accept, 948 .getname = inet_getname, 949 .poll = datagram_poll, 950 .ioctl = inet_ioctl, 951 .listen = sock_no_listen, 952 .shutdown = inet_shutdown, 953 .setsockopt = sock_common_setsockopt, 954 .getsockopt = sock_common_getsockopt, 955 .sendmsg = inet_sendmsg, 956 .recvmsg = inet_recvmsg, 957 .mmap = sock_no_mmap, 958 .sendpage = inet_sendpage, 959 #ifdef CONFIG_COMPAT 960 .compat_setsockopt = compat_sock_common_setsockopt, 961 .compat_getsockopt = compat_sock_common_getsockopt, 962 #endif 963 }; 964 965 static const struct net_proto_family inet_family_ops = { 966 .family = PF_INET, 967 .create = inet_create, 968 .owner = THIS_MODULE, 969 }; 970 971 /* Upon startup we insert all the elements in inetsw_array[] into 972 * the linked list inetsw. 973 */ 974 static struct inet_protosw inetsw_array[] = 975 { 976 { 977 .type = SOCK_STREAM, 978 .protocol = IPPROTO_TCP, 979 .prot = &tcp_prot, 980 .ops = &inet_stream_ops, 981 .no_check = 0, 982 .flags = INET_PROTOSW_PERMANENT | 983 INET_PROTOSW_ICSK, 984 }, 985 986 { 987 .type = SOCK_DGRAM, 988 .protocol = IPPROTO_UDP, 989 .prot = &udp_prot, 990 .ops = &inet_dgram_ops, 991 .no_check = UDP_CSUM_DEFAULT, 992 .flags = INET_PROTOSW_PERMANENT, 993 }, 994 995 996 { 997 .type = SOCK_RAW, 998 .protocol = IPPROTO_IP, /* wild card */ 999 .prot = &raw_prot, 1000 .ops = &inet_sockraw_ops, 1001 .no_check = UDP_CSUM_DEFAULT, 1002 .flags = INET_PROTOSW_REUSE, 1003 } 1004 }; 1005 1006 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) 1007 1008 void inet_register_protosw(struct inet_protosw *p) 1009 { 1010 struct list_head *lh; 1011 struct inet_protosw *answer; 1012 int protocol = p->protocol; 1013 struct list_head *last_perm; 1014 1015 spin_lock_bh(&inetsw_lock); 1016 1017 if (p->type >= SOCK_MAX) 1018 goto out_illegal; 1019 1020 /* If we are trying to override a permanent protocol, bail. */ 1021 answer = NULL; 1022 last_perm = &inetsw[p->type]; 1023 list_for_each(lh, &inetsw[p->type]) { 1024 answer = list_entry(lh, struct inet_protosw, list); 1025 1026 /* Check only the non-wild match. */ 1027 if (INET_PROTOSW_PERMANENT & answer->flags) { 1028 if (protocol == answer->protocol) 1029 break; 1030 last_perm = lh; 1031 } 1032 1033 answer = NULL; 1034 } 1035 if (answer) 1036 goto out_permanent; 1037 1038 /* Add the new entry after the last permanent entry if any, so that 1039 * the new entry does not override a permanent entry when matched with 1040 * a wild-card protocol. But it is allowed to override any existing 1041 * non-permanent entry. This means that when we remove this entry, the 1042 * system automatically returns to the old behavior. 1043 */ 1044 list_add_rcu(&p->list, last_perm); 1045 out: 1046 spin_unlock_bh(&inetsw_lock); 1047 1048 return; 1049 1050 out_permanent: 1051 printk(KERN_ERR "Attempt to override permanent protocol %d.\n", 1052 protocol); 1053 goto out; 1054 1055 out_illegal: 1056 printk(KERN_ERR 1057 "Ignoring attempt to register invalid socket type %d.\n", 1058 p->type); 1059 goto out; 1060 } 1061 EXPORT_SYMBOL(inet_register_protosw); 1062 1063 void inet_unregister_protosw(struct inet_protosw *p) 1064 { 1065 if (INET_PROTOSW_PERMANENT & p->flags) { 1066 printk(KERN_ERR 1067 "Attempt to unregister permanent protocol %d.\n", 1068 p->protocol); 1069 } else { 1070 spin_lock_bh(&inetsw_lock); 1071 list_del_rcu(&p->list); 1072 spin_unlock_bh(&inetsw_lock); 1073 1074 synchronize_net(); 1075 } 1076 } 1077 EXPORT_SYMBOL(inet_unregister_protosw); 1078 1079 /* 1080 * Shall we try to damage output packets if routing dev changes? 1081 */ 1082 1083 int sysctl_ip_dynaddr __read_mostly; 1084 1085 static int inet_sk_reselect_saddr(struct sock *sk) 1086 { 1087 struct inet_sock *inet = inet_sk(sk); 1088 int err; 1089 struct rtable *rt; 1090 __be32 old_saddr = inet->inet_saddr; 1091 __be32 new_saddr; 1092 __be32 daddr = inet->inet_daddr; 1093 1094 if (inet->opt && inet->opt->srr) 1095 daddr = inet->opt->faddr; 1096 1097 /* Query new route. */ 1098 err = ip_route_connect(&rt, daddr, 0, 1099 RT_CONN_FLAGS(sk), 1100 sk->sk_bound_dev_if, 1101 sk->sk_protocol, 1102 inet->inet_sport, inet->inet_dport, sk, 0); 1103 if (err) 1104 return err; 1105 1106 sk_setup_caps(sk, &rt->dst); 1107 1108 new_saddr = rt->rt_src; 1109 1110 if (new_saddr == old_saddr) 1111 return 0; 1112 1113 if (sysctl_ip_dynaddr > 1) { 1114 printk(KERN_INFO "%s(): shifting inet->saddr from %pI4 to %pI4\n", 1115 __func__, &old_saddr, &new_saddr); 1116 } 1117 1118 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr; 1119 1120 /* 1121 * XXX The only one ugly spot where we need to 1122 * XXX really change the sockets identity after 1123 * XXX it has entered the hashes. -DaveM 1124 * 1125 * Besides that, it does not check for connection 1126 * uniqueness. Wait for troubles. 1127 */ 1128 __sk_prot_rehash(sk); 1129 return 0; 1130 } 1131 1132 int inet_sk_rebuild_header(struct sock *sk) 1133 { 1134 struct inet_sock *inet = inet_sk(sk); 1135 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); 1136 __be32 daddr; 1137 int err; 1138 1139 /* Route is OK, nothing to do. */ 1140 if (rt) 1141 return 0; 1142 1143 /* Reroute. */ 1144 daddr = inet->inet_daddr; 1145 if (inet->opt && inet->opt->srr) 1146 daddr = inet->opt->faddr; 1147 { 1148 struct flowi fl = { 1149 .oif = sk->sk_bound_dev_if, 1150 .mark = sk->sk_mark, 1151 .nl_u = { 1152 .ip4_u = { 1153 .daddr = daddr, 1154 .saddr = inet->inet_saddr, 1155 .tos = RT_CONN_FLAGS(sk), 1156 }, 1157 }, 1158 .proto = sk->sk_protocol, 1159 .flags = inet_sk_flowi_flags(sk), 1160 .uli_u = { 1161 .ports = { 1162 .sport = inet->inet_sport, 1163 .dport = inet->inet_dport, 1164 }, 1165 }, 1166 }; 1167 1168 security_sk_classify_flow(sk, &fl); 1169 err = ip_route_output_flow(sock_net(sk), &rt, &fl, sk, 0); 1170 } 1171 if (!err) 1172 sk_setup_caps(sk, &rt->dst); 1173 else { 1174 /* Routing failed... */ 1175 sk->sk_route_caps = 0; 1176 /* 1177 * Other protocols have to map its equivalent state to TCP_SYN_SENT. 1178 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme 1179 */ 1180 if (!sysctl_ip_dynaddr || 1181 sk->sk_state != TCP_SYN_SENT || 1182 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 1183 (err = inet_sk_reselect_saddr(sk)) != 0) 1184 sk->sk_err_soft = -err; 1185 } 1186 1187 return err; 1188 } 1189 EXPORT_SYMBOL(inet_sk_rebuild_header); 1190 1191 static int inet_gso_send_check(struct sk_buff *skb) 1192 { 1193 struct iphdr *iph; 1194 const struct net_protocol *ops; 1195 int proto; 1196 int ihl; 1197 int err = -EINVAL; 1198 1199 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1200 goto out; 1201 1202 iph = ip_hdr(skb); 1203 ihl = iph->ihl * 4; 1204 if (ihl < sizeof(*iph)) 1205 goto out; 1206 1207 if (unlikely(!pskb_may_pull(skb, ihl))) 1208 goto out; 1209 1210 __skb_pull(skb, ihl); 1211 skb_reset_transport_header(skb); 1212 iph = ip_hdr(skb); 1213 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1214 err = -EPROTONOSUPPORT; 1215 1216 rcu_read_lock(); 1217 ops = rcu_dereference(inet_protos[proto]); 1218 if (likely(ops && ops->gso_send_check)) 1219 err = ops->gso_send_check(skb); 1220 rcu_read_unlock(); 1221 1222 out: 1223 return err; 1224 } 1225 1226 static struct sk_buff *inet_gso_segment(struct sk_buff *skb, int features) 1227 { 1228 struct sk_buff *segs = ERR_PTR(-EINVAL); 1229 struct iphdr *iph; 1230 const struct net_protocol *ops; 1231 int proto; 1232 int ihl; 1233 int id; 1234 unsigned int offset = 0; 1235 1236 if (!(features & NETIF_F_V4_CSUM)) 1237 features &= ~NETIF_F_SG; 1238 1239 if (unlikely(skb_shinfo(skb)->gso_type & 1240 ~(SKB_GSO_TCPV4 | 1241 SKB_GSO_UDP | 1242 SKB_GSO_DODGY | 1243 SKB_GSO_TCP_ECN | 1244 0))) 1245 goto out; 1246 1247 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1248 goto out; 1249 1250 iph = ip_hdr(skb); 1251 ihl = iph->ihl * 4; 1252 if (ihl < sizeof(*iph)) 1253 goto out; 1254 1255 if (unlikely(!pskb_may_pull(skb, ihl))) 1256 goto out; 1257 1258 __skb_pull(skb, ihl); 1259 skb_reset_transport_header(skb); 1260 iph = ip_hdr(skb); 1261 id = ntohs(iph->id); 1262 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1263 segs = ERR_PTR(-EPROTONOSUPPORT); 1264 1265 rcu_read_lock(); 1266 ops = rcu_dereference(inet_protos[proto]); 1267 if (likely(ops && ops->gso_segment)) 1268 segs = ops->gso_segment(skb, features); 1269 rcu_read_unlock(); 1270 1271 if (!segs || IS_ERR(segs)) 1272 goto out; 1273 1274 skb = segs; 1275 do { 1276 iph = ip_hdr(skb); 1277 if (proto == IPPROTO_UDP) { 1278 iph->id = htons(id); 1279 iph->frag_off = htons(offset >> 3); 1280 if (skb->next != NULL) 1281 iph->frag_off |= htons(IP_MF); 1282 offset += (skb->len - skb->mac_len - iph->ihl * 4); 1283 } else 1284 iph->id = htons(id++); 1285 iph->tot_len = htons(skb->len - skb->mac_len); 1286 iph->check = 0; 1287 iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl); 1288 } while ((skb = skb->next)); 1289 1290 out: 1291 return segs; 1292 } 1293 1294 static struct sk_buff **inet_gro_receive(struct sk_buff **head, 1295 struct sk_buff *skb) 1296 { 1297 const struct net_protocol *ops; 1298 struct sk_buff **pp = NULL; 1299 struct sk_buff *p; 1300 struct iphdr *iph; 1301 unsigned int hlen; 1302 unsigned int off; 1303 unsigned int id; 1304 int flush = 1; 1305 int proto; 1306 1307 off = skb_gro_offset(skb); 1308 hlen = off + sizeof(*iph); 1309 iph = skb_gro_header_fast(skb, off); 1310 if (skb_gro_header_hard(skb, hlen)) { 1311 iph = skb_gro_header_slow(skb, hlen, off); 1312 if (unlikely(!iph)) 1313 goto out; 1314 } 1315 1316 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1317 1318 rcu_read_lock(); 1319 ops = rcu_dereference(inet_protos[proto]); 1320 if (!ops || !ops->gro_receive) 1321 goto out_unlock; 1322 1323 if (*(u8 *)iph != 0x45) 1324 goto out_unlock; 1325 1326 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) 1327 goto out_unlock; 1328 1329 id = ntohl(*(__be32 *)&iph->id); 1330 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id ^ IP_DF)); 1331 id >>= 16; 1332 1333 for (p = *head; p; p = p->next) { 1334 struct iphdr *iph2; 1335 1336 if (!NAPI_GRO_CB(p)->same_flow) 1337 continue; 1338 1339 iph2 = ip_hdr(p); 1340 1341 if ((iph->protocol ^ iph2->protocol) | 1342 (iph->tos ^ iph2->tos) | 1343 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) | 1344 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) { 1345 NAPI_GRO_CB(p)->same_flow = 0; 1346 continue; 1347 } 1348 1349 /* All fields must match except length and checksum. */ 1350 NAPI_GRO_CB(p)->flush |= 1351 (iph->ttl ^ iph2->ttl) | 1352 ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id); 1353 1354 NAPI_GRO_CB(p)->flush |= flush; 1355 } 1356 1357 NAPI_GRO_CB(skb)->flush |= flush; 1358 skb_gro_pull(skb, sizeof(*iph)); 1359 skb_set_transport_header(skb, skb_gro_offset(skb)); 1360 1361 pp = ops->gro_receive(head, skb); 1362 1363 out_unlock: 1364 rcu_read_unlock(); 1365 1366 out: 1367 NAPI_GRO_CB(skb)->flush |= flush; 1368 1369 return pp; 1370 } 1371 1372 static int inet_gro_complete(struct sk_buff *skb) 1373 { 1374 const struct net_protocol *ops; 1375 struct iphdr *iph = ip_hdr(skb); 1376 int proto = iph->protocol & (MAX_INET_PROTOS - 1); 1377 int err = -ENOSYS; 1378 __be16 newlen = htons(skb->len - skb_network_offset(skb)); 1379 1380 csum_replace2(&iph->check, iph->tot_len, newlen); 1381 iph->tot_len = newlen; 1382 1383 rcu_read_lock(); 1384 ops = rcu_dereference(inet_protos[proto]); 1385 if (WARN_ON(!ops || !ops->gro_complete)) 1386 goto out_unlock; 1387 1388 err = ops->gro_complete(skb); 1389 1390 out_unlock: 1391 rcu_read_unlock(); 1392 1393 return err; 1394 } 1395 1396 int inet_ctl_sock_create(struct sock **sk, unsigned short family, 1397 unsigned short type, unsigned char protocol, 1398 struct net *net) 1399 { 1400 struct socket *sock; 1401 int rc = sock_create_kern(family, type, protocol, &sock); 1402 1403 if (rc == 0) { 1404 *sk = sock->sk; 1405 (*sk)->sk_allocation = GFP_ATOMIC; 1406 /* 1407 * Unhash it so that IP input processing does not even see it, 1408 * we do not wish this socket to see incoming packets. 1409 */ 1410 (*sk)->sk_prot->unhash(*sk); 1411 1412 sk_change_net(*sk, net); 1413 } 1414 return rc; 1415 } 1416 EXPORT_SYMBOL_GPL(inet_ctl_sock_create); 1417 1418 unsigned long snmp_fold_field(void __percpu *mib[], int offt) 1419 { 1420 unsigned long res = 0; 1421 int i; 1422 1423 for_each_possible_cpu(i) { 1424 res += *(((unsigned long *) per_cpu_ptr(mib[0], i)) + offt); 1425 res += *(((unsigned long *) per_cpu_ptr(mib[1], i)) + offt); 1426 } 1427 return res; 1428 } 1429 EXPORT_SYMBOL_GPL(snmp_fold_field); 1430 1431 #if BITS_PER_LONG==32 1432 1433 u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t syncp_offset) 1434 { 1435 u64 res = 0; 1436 int cpu; 1437 1438 for_each_possible_cpu(cpu) { 1439 void *bhptr, *userptr; 1440 struct u64_stats_sync *syncp; 1441 u64 v_bh, v_user; 1442 unsigned int start; 1443 1444 /* first mib used by softirq context, we must use _bh() accessors */ 1445 bhptr = per_cpu_ptr(SNMP_STAT_BHPTR(mib), cpu); 1446 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset); 1447 do { 1448 start = u64_stats_fetch_begin_bh(syncp); 1449 v_bh = *(((u64 *) bhptr) + offt); 1450 } while (u64_stats_fetch_retry_bh(syncp, start)); 1451 1452 /* second mib used in USER context */ 1453 userptr = per_cpu_ptr(SNMP_STAT_USRPTR(mib), cpu); 1454 syncp = (struct u64_stats_sync *)(userptr + syncp_offset); 1455 do { 1456 start = u64_stats_fetch_begin(syncp); 1457 v_user = *(((u64 *) userptr) + offt); 1458 } while (u64_stats_fetch_retry(syncp, start)); 1459 1460 res += v_bh + v_user; 1461 } 1462 return res; 1463 } 1464 EXPORT_SYMBOL_GPL(snmp_fold_field64); 1465 #endif 1466 1467 int snmp_mib_init(void __percpu *ptr[2], size_t mibsize, size_t align) 1468 { 1469 BUG_ON(ptr == NULL); 1470 ptr[0] = __alloc_percpu(mibsize, align); 1471 if (!ptr[0]) 1472 goto err0; 1473 ptr[1] = __alloc_percpu(mibsize, align); 1474 if (!ptr[1]) 1475 goto err1; 1476 return 0; 1477 err1: 1478 free_percpu(ptr[0]); 1479 ptr[0] = NULL; 1480 err0: 1481 return -ENOMEM; 1482 } 1483 EXPORT_SYMBOL_GPL(snmp_mib_init); 1484 1485 void snmp_mib_free(void __percpu *ptr[2]) 1486 { 1487 BUG_ON(ptr == NULL); 1488 free_percpu(ptr[0]); 1489 free_percpu(ptr[1]); 1490 ptr[0] = ptr[1] = NULL; 1491 } 1492 EXPORT_SYMBOL_GPL(snmp_mib_free); 1493 1494 #ifdef CONFIG_IP_MULTICAST 1495 static const struct net_protocol igmp_protocol = { 1496 .handler = igmp_rcv, 1497 .netns_ok = 1, 1498 }; 1499 #endif 1500 1501 static const struct net_protocol tcp_protocol = { 1502 .handler = tcp_v4_rcv, 1503 .err_handler = tcp_v4_err, 1504 .gso_send_check = tcp_v4_gso_send_check, 1505 .gso_segment = tcp_tso_segment, 1506 .gro_receive = tcp4_gro_receive, 1507 .gro_complete = tcp4_gro_complete, 1508 .no_policy = 1, 1509 .netns_ok = 1, 1510 }; 1511 1512 static const struct net_protocol udp_protocol = { 1513 .handler = udp_rcv, 1514 .err_handler = udp_err, 1515 .gso_send_check = udp4_ufo_send_check, 1516 .gso_segment = udp4_ufo_fragment, 1517 .no_policy = 1, 1518 .netns_ok = 1, 1519 }; 1520 1521 static const struct net_protocol icmp_protocol = { 1522 .handler = icmp_rcv, 1523 .no_policy = 1, 1524 .netns_ok = 1, 1525 }; 1526 1527 static __net_init int ipv4_mib_init_net(struct net *net) 1528 { 1529 if (snmp_mib_init((void __percpu **)net->mib.tcp_statistics, 1530 sizeof(struct tcp_mib), 1531 __alignof__(struct tcp_mib)) < 0) 1532 goto err_tcp_mib; 1533 if (snmp_mib_init((void __percpu **)net->mib.ip_statistics, 1534 sizeof(struct ipstats_mib), 1535 __alignof__(struct ipstats_mib)) < 0) 1536 goto err_ip_mib; 1537 if (snmp_mib_init((void __percpu **)net->mib.net_statistics, 1538 sizeof(struct linux_mib), 1539 __alignof__(struct linux_mib)) < 0) 1540 goto err_net_mib; 1541 if (snmp_mib_init((void __percpu **)net->mib.udp_statistics, 1542 sizeof(struct udp_mib), 1543 __alignof__(struct udp_mib)) < 0) 1544 goto err_udp_mib; 1545 if (snmp_mib_init((void __percpu **)net->mib.udplite_statistics, 1546 sizeof(struct udp_mib), 1547 __alignof__(struct udp_mib)) < 0) 1548 goto err_udplite_mib; 1549 if (snmp_mib_init((void __percpu **)net->mib.icmp_statistics, 1550 sizeof(struct icmp_mib), 1551 __alignof__(struct icmp_mib)) < 0) 1552 goto err_icmp_mib; 1553 if (snmp_mib_init((void __percpu **)net->mib.icmpmsg_statistics, 1554 sizeof(struct icmpmsg_mib), 1555 __alignof__(struct icmpmsg_mib)) < 0) 1556 goto err_icmpmsg_mib; 1557 1558 tcp_mib_init(net); 1559 return 0; 1560 1561 err_icmpmsg_mib: 1562 snmp_mib_free((void __percpu **)net->mib.icmp_statistics); 1563 err_icmp_mib: 1564 snmp_mib_free((void __percpu **)net->mib.udplite_statistics); 1565 err_udplite_mib: 1566 snmp_mib_free((void __percpu **)net->mib.udp_statistics); 1567 err_udp_mib: 1568 snmp_mib_free((void __percpu **)net->mib.net_statistics); 1569 err_net_mib: 1570 snmp_mib_free((void __percpu **)net->mib.ip_statistics); 1571 err_ip_mib: 1572 snmp_mib_free((void __percpu **)net->mib.tcp_statistics); 1573 err_tcp_mib: 1574 return -ENOMEM; 1575 } 1576 1577 static __net_exit void ipv4_mib_exit_net(struct net *net) 1578 { 1579 snmp_mib_free((void __percpu **)net->mib.icmpmsg_statistics); 1580 snmp_mib_free((void __percpu **)net->mib.icmp_statistics); 1581 snmp_mib_free((void __percpu **)net->mib.udplite_statistics); 1582 snmp_mib_free((void __percpu **)net->mib.udp_statistics); 1583 snmp_mib_free((void __percpu **)net->mib.net_statistics); 1584 snmp_mib_free((void __percpu **)net->mib.ip_statistics); 1585 snmp_mib_free((void __percpu **)net->mib.tcp_statistics); 1586 } 1587 1588 static __net_initdata struct pernet_operations ipv4_mib_ops = { 1589 .init = ipv4_mib_init_net, 1590 .exit = ipv4_mib_exit_net, 1591 }; 1592 1593 static int __init init_ipv4_mibs(void) 1594 { 1595 return register_pernet_subsys(&ipv4_mib_ops); 1596 } 1597 1598 static int ipv4_proc_init(void); 1599 1600 /* 1601 * IP protocol layer initialiser 1602 */ 1603 1604 static struct packet_type ip_packet_type __read_mostly = { 1605 .type = cpu_to_be16(ETH_P_IP), 1606 .func = ip_rcv, 1607 .gso_send_check = inet_gso_send_check, 1608 .gso_segment = inet_gso_segment, 1609 .gro_receive = inet_gro_receive, 1610 .gro_complete = inet_gro_complete, 1611 }; 1612 1613 static int __init inet_init(void) 1614 { 1615 struct sk_buff *dummy_skb; 1616 struct inet_protosw *q; 1617 struct list_head *r; 1618 int rc = -EINVAL; 1619 1620 BUILD_BUG_ON(sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb)); 1621 1622 sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL); 1623 if (!sysctl_local_reserved_ports) 1624 goto out; 1625 1626 rc = proto_register(&tcp_prot, 1); 1627 if (rc) 1628 goto out_free_reserved_ports; 1629 1630 rc = proto_register(&udp_prot, 1); 1631 if (rc) 1632 goto out_unregister_tcp_proto; 1633 1634 rc = proto_register(&raw_prot, 1); 1635 if (rc) 1636 goto out_unregister_udp_proto; 1637 1638 /* 1639 * Tell SOCKET that we are alive... 1640 */ 1641 1642 (void)sock_register(&inet_family_ops); 1643 1644 #ifdef CONFIG_SYSCTL 1645 ip_static_sysctl_init(); 1646 #endif 1647 1648 /* 1649 * Add all the base protocols. 1650 */ 1651 1652 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 1653 printk(KERN_CRIT "inet_init: Cannot add ICMP protocol\n"); 1654 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) 1655 printk(KERN_CRIT "inet_init: Cannot add UDP protocol\n"); 1656 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) 1657 printk(KERN_CRIT "inet_init: Cannot add TCP protocol\n"); 1658 #ifdef CONFIG_IP_MULTICAST 1659 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 1660 printk(KERN_CRIT "inet_init: Cannot add IGMP protocol\n"); 1661 #endif 1662 1663 /* Register the socket-side information for inet_create. */ 1664 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 1665 INIT_LIST_HEAD(r); 1666 1667 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 1668 inet_register_protosw(q); 1669 1670 /* 1671 * Set the ARP module up 1672 */ 1673 1674 arp_init(); 1675 1676 /* 1677 * Set the IP module up 1678 */ 1679 1680 ip_init(); 1681 1682 tcp_v4_init(); 1683 1684 /* Setup TCP slab cache for open requests. */ 1685 tcp_init(); 1686 1687 /* Setup UDP memory threshold */ 1688 udp_init(); 1689 1690 /* Add UDP-Lite (RFC 3828) */ 1691 udplite4_register(); 1692 1693 /* 1694 * Set the ICMP layer up 1695 */ 1696 1697 if (icmp_init() < 0) 1698 panic("Failed to create the ICMP control socket.\n"); 1699 1700 /* 1701 * Initialise the multicast router 1702 */ 1703 #if defined(CONFIG_IP_MROUTE) 1704 if (ip_mr_init()) 1705 printk(KERN_CRIT "inet_init: Cannot init ipv4 mroute\n"); 1706 #endif 1707 /* 1708 * Initialise per-cpu ipv4 mibs 1709 */ 1710 1711 if (init_ipv4_mibs()) 1712 printk(KERN_CRIT "inet_init: Cannot init ipv4 mibs\n"); 1713 1714 ipv4_proc_init(); 1715 1716 ipfrag_init(); 1717 1718 dev_add_pack(&ip_packet_type); 1719 1720 rc = 0; 1721 out: 1722 return rc; 1723 out_unregister_udp_proto: 1724 proto_unregister(&udp_prot); 1725 out_unregister_tcp_proto: 1726 proto_unregister(&tcp_prot); 1727 out_free_reserved_ports: 1728 kfree(sysctl_local_reserved_ports); 1729 goto out; 1730 } 1731 1732 fs_initcall(inet_init); 1733 1734 /* ------------------------------------------------------------------------ */ 1735 1736 #ifdef CONFIG_PROC_FS 1737 static int __init ipv4_proc_init(void) 1738 { 1739 int rc = 0; 1740 1741 if (raw_proc_init()) 1742 goto out_raw; 1743 if (tcp4_proc_init()) 1744 goto out_tcp; 1745 if (udp4_proc_init()) 1746 goto out_udp; 1747 if (ip_misc_proc_init()) 1748 goto out_misc; 1749 out: 1750 return rc; 1751 out_misc: 1752 udp4_proc_exit(); 1753 out_udp: 1754 tcp4_proc_exit(); 1755 out_tcp: 1756 raw_proc_exit(); 1757 out_raw: 1758 rc = -ENOMEM; 1759 goto out; 1760 } 1761 1762 #else /* CONFIG_PROC_FS */ 1763 static int __init ipv4_proc_init(void) 1764 { 1765 return 0; 1766 } 1767 #endif /* CONFIG_PROC_FS */ 1768 1769 MODULE_ALIAS_NETPROTO(PF_INET); 1770 1771