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 <net/ping.h> 109 #include <linux/skbuff.h> 110 #include <net/sock.h> 111 #include <net/raw.h> 112 #include <net/icmp.h> 113 #include <net/ipip.h> 114 #include <net/inet_common.h> 115 #include <net/xfrm.h> 116 #include <net/net_namespace.h> 117 #ifdef CONFIG_IP_MROUTE 118 #include <linux/mroute.h> 119 #endif 120 121 122 /* The inetsw table contains everything that inet_create needs to 123 * build a new socket. 124 */ 125 static struct list_head inetsw[SOCK_MAX]; 126 static DEFINE_SPINLOCK(inetsw_lock); 127 128 struct ipv4_config ipv4_config; 129 EXPORT_SYMBOL(ipv4_config); 130 131 /* New destruction routine */ 132 133 void inet_sock_destruct(struct sock *sk) 134 { 135 struct inet_sock *inet = inet_sk(sk); 136 137 __skb_queue_purge(&sk->sk_receive_queue); 138 __skb_queue_purge(&sk->sk_error_queue); 139 140 sk_mem_reclaim(sk); 141 142 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) { 143 pr_err("Attempt to release TCP socket in state %d %p\n", 144 sk->sk_state, sk); 145 return; 146 } 147 if (!sock_flag(sk, SOCK_DEAD)) { 148 pr_err("Attempt to release alive inet socket %p\n", sk); 149 return; 150 } 151 152 WARN_ON(atomic_read(&sk->sk_rmem_alloc)); 153 WARN_ON(atomic_read(&sk->sk_wmem_alloc)); 154 WARN_ON(sk->sk_wmem_queued); 155 WARN_ON(sk->sk_forward_alloc); 156 157 kfree(rcu_dereference_protected(inet->inet_opt, 1)); 158 dst_release(rcu_dereference_check(sk->sk_dst_cache, 1)); 159 sk_refcnt_debug_dec(sk); 160 } 161 EXPORT_SYMBOL(inet_sock_destruct); 162 163 /* 164 * The routines beyond this point handle the behaviour of an AF_INET 165 * socket object. Mostly it punts to the subprotocols of IP to do 166 * the work. 167 */ 168 169 /* 170 * Automatically bind an unbound socket. 171 */ 172 173 static int inet_autobind(struct sock *sk) 174 { 175 struct inet_sock *inet; 176 /* We may need to bind the socket. */ 177 lock_sock(sk); 178 inet = inet_sk(sk); 179 if (!inet->inet_num) { 180 if (sk->sk_prot->get_port(sk, 0)) { 181 release_sock(sk); 182 return -EAGAIN; 183 } 184 inet->inet_sport = htons(inet->inet_num); 185 } 186 release_sock(sk); 187 return 0; 188 } 189 190 /* 191 * Move a socket into listening state. 192 */ 193 int inet_listen(struct socket *sock, int backlog) 194 { 195 struct sock *sk = sock->sk; 196 unsigned char old_state; 197 int err; 198 199 lock_sock(sk); 200 201 err = -EINVAL; 202 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM) 203 goto out; 204 205 old_state = sk->sk_state; 206 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN))) 207 goto out; 208 209 /* Really, if the socket is already in listen state 210 * we can only allow the backlog to be adjusted. 211 */ 212 if (old_state != TCP_LISTEN) { 213 err = inet_csk_listen_start(sk, backlog); 214 if (err) 215 goto out; 216 } 217 sk->sk_max_ack_backlog = backlog; 218 err = 0; 219 220 out: 221 release_sock(sk); 222 return err; 223 } 224 EXPORT_SYMBOL(inet_listen); 225 226 u32 inet_ehash_secret __read_mostly; 227 EXPORT_SYMBOL(inet_ehash_secret); 228 229 /* 230 * inet_ehash_secret must be set exactly once 231 */ 232 void build_ehash_secret(void) 233 { 234 u32 rnd; 235 236 do { 237 get_random_bytes(&rnd, sizeof(rnd)); 238 } while (rnd == 0); 239 240 cmpxchg(&inet_ehash_secret, 0, rnd); 241 } 242 EXPORT_SYMBOL(build_ehash_secret); 243 244 static inline int inet_netns_ok(struct net *net, int protocol) 245 { 246 int hash; 247 const struct net_protocol *ipprot; 248 249 if (net_eq(net, &init_net)) 250 return 1; 251 252 hash = protocol & (MAX_INET_PROTOS - 1); 253 ipprot = rcu_dereference(inet_protos[hash]); 254 255 if (ipprot == NULL) 256 /* raw IP is OK */ 257 return 1; 258 return ipprot->netns_ok; 259 } 260 261 /* 262 * Create an inet socket. 263 */ 264 265 static int inet_create(struct net *net, struct socket *sock, int protocol, 266 int kern) 267 { 268 struct sock *sk; 269 struct inet_protosw *answer; 270 struct inet_sock *inet; 271 struct proto *answer_prot; 272 unsigned char answer_flags; 273 char answer_no_check; 274 int try_loading_module = 0; 275 int err; 276 277 if (unlikely(!inet_ehash_secret)) 278 if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM) 279 build_ehash_secret(); 280 281 sock->state = SS_UNCONNECTED; 282 283 /* Look for the requested type/protocol pair. */ 284 lookup_protocol: 285 err = -ESOCKTNOSUPPORT; 286 rcu_read_lock(); 287 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) { 288 289 err = 0; 290 /* Check the non-wild match. */ 291 if (protocol == answer->protocol) { 292 if (protocol != IPPROTO_IP) 293 break; 294 } else { 295 /* Check for the two wild cases. */ 296 if (IPPROTO_IP == protocol) { 297 protocol = answer->protocol; 298 break; 299 } 300 if (IPPROTO_IP == answer->protocol) 301 break; 302 } 303 err = -EPROTONOSUPPORT; 304 } 305 306 if (unlikely(err)) { 307 if (try_loading_module < 2) { 308 rcu_read_unlock(); 309 /* 310 * Be more specific, e.g. net-pf-2-proto-132-type-1 311 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) 312 */ 313 if (++try_loading_module == 1) 314 request_module("net-pf-%d-proto-%d-type-%d", 315 PF_INET, protocol, sock->type); 316 /* 317 * Fall back to generic, e.g. net-pf-2-proto-132 318 * (net-pf-PF_INET-proto-IPPROTO_SCTP) 319 */ 320 else 321 request_module("net-pf-%d-proto-%d", 322 PF_INET, protocol); 323 goto lookup_protocol; 324 } else 325 goto out_rcu_unlock; 326 } 327 328 err = -EPERM; 329 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW)) 330 goto out_rcu_unlock; 331 332 err = -EAFNOSUPPORT; 333 if (!inet_netns_ok(net, protocol)) 334 goto out_rcu_unlock; 335 336 sock->ops = answer->ops; 337 answer_prot = answer->prot; 338 answer_no_check = answer->no_check; 339 answer_flags = answer->flags; 340 rcu_read_unlock(); 341 342 WARN_ON(answer_prot->slab == NULL); 343 344 err = -ENOBUFS; 345 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot); 346 if (sk == NULL) 347 goto out; 348 349 err = 0; 350 sk->sk_no_check = answer_no_check; 351 if (INET_PROTOSW_REUSE & answer_flags) 352 sk->sk_reuse = 1; 353 354 inet = inet_sk(sk); 355 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 356 357 inet->nodefrag = 0; 358 359 if (SOCK_RAW == sock->type) { 360 inet->inet_num = protocol; 361 if (IPPROTO_RAW == protocol) 362 inet->hdrincl = 1; 363 } 364 365 if (ipv4_config.no_pmtu_disc) 366 inet->pmtudisc = IP_PMTUDISC_DONT; 367 else 368 inet->pmtudisc = IP_PMTUDISC_WANT; 369 370 inet->inet_id = 0; 371 372 sock_init_data(sock, sk); 373 374 sk->sk_destruct = inet_sock_destruct; 375 sk->sk_protocol = protocol; 376 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 377 378 inet->uc_ttl = -1; 379 inet->mc_loop = 1; 380 inet->mc_ttl = 1; 381 inet->mc_all = 1; 382 inet->mc_index = 0; 383 inet->mc_list = NULL; 384 385 sk_refcnt_debug_inc(sk); 386 387 if (inet->inet_num) { 388 /* It assumes that any protocol which allows 389 * the user to assign a number at socket 390 * creation time automatically 391 * shares. 392 */ 393 inet->inet_sport = htons(inet->inet_num); 394 /* Add to protocol hash chains. */ 395 sk->sk_prot->hash(sk); 396 } 397 398 if (sk->sk_prot->init) { 399 err = sk->sk_prot->init(sk); 400 if (err) 401 sk_common_release(sk); 402 } 403 out: 404 return err; 405 out_rcu_unlock: 406 rcu_read_unlock(); 407 goto out; 408 } 409 410 411 /* 412 * The peer socket should always be NULL (or else). When we call this 413 * function we are destroying the object and from then on nobody 414 * should refer to it. 415 */ 416 int inet_release(struct socket *sock) 417 { 418 struct sock *sk = sock->sk; 419 420 if (sk) { 421 long timeout; 422 423 sock_rps_reset_flow(sk); 424 425 /* Applications forget to leave groups before exiting */ 426 ip_mc_drop_socket(sk); 427 428 /* If linger is set, we don't return until the close 429 * is complete. Otherwise we return immediately. The 430 * actually closing is done the same either way. 431 * 432 * If the close is due to the process exiting, we never 433 * linger.. 434 */ 435 timeout = 0; 436 if (sock_flag(sk, SOCK_LINGER) && 437 !(current->flags & PF_EXITING)) 438 timeout = sk->sk_lingertime; 439 sock->sk = NULL; 440 sk->sk_prot->close(sk, timeout); 441 } 442 return 0; 443 } 444 EXPORT_SYMBOL(inet_release); 445 446 /* It is off by default, see below. */ 447 int sysctl_ip_nonlocal_bind __read_mostly; 448 EXPORT_SYMBOL(sysctl_ip_nonlocal_bind); 449 450 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 451 { 452 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 453 struct sock *sk = sock->sk; 454 struct inet_sock *inet = inet_sk(sk); 455 unsigned short snum; 456 int chk_addr_ret; 457 int err; 458 459 /* If the socket has its own bind function then use it. (RAW) */ 460 if (sk->sk_prot->bind) { 461 err = sk->sk_prot->bind(sk, uaddr, addr_len); 462 goto out; 463 } 464 err = -EINVAL; 465 if (addr_len < sizeof(struct sockaddr_in)) 466 goto out; 467 468 if (addr->sin_family != AF_INET) 469 goto out; 470 471 chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr); 472 473 /* Not specified by any standard per-se, however it breaks too 474 * many applications when removed. It is unfortunate since 475 * allowing applications to make a non-local bind solves 476 * several problems with systems using dynamic addressing. 477 * (ie. your servers still start up even if your ISDN link 478 * is temporarily down) 479 */ 480 err = -EADDRNOTAVAIL; 481 if (!sysctl_ip_nonlocal_bind && 482 !(inet->freebind || inet->transparent) && 483 addr->sin_addr.s_addr != htonl(INADDR_ANY) && 484 chk_addr_ret != RTN_LOCAL && 485 chk_addr_ret != RTN_MULTICAST && 486 chk_addr_ret != RTN_BROADCAST) 487 goto out; 488 489 snum = ntohs(addr->sin_port); 490 err = -EACCES; 491 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) 492 goto out; 493 494 /* We keep a pair of addresses. rcv_saddr is the one 495 * used by hash lookups, and saddr is used for transmit. 496 * 497 * In the BSD API these are the same except where it 498 * would be illegal to use them (multicast/broadcast) in 499 * which case the sending device address is used. 500 */ 501 lock_sock(sk); 502 503 /* Check these errors (active socket, double bind). */ 504 err = -EINVAL; 505 if (sk->sk_state != TCP_CLOSE || inet->inet_num) 506 goto out_release_sock; 507 508 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 509 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 510 inet->inet_saddr = 0; /* Use device */ 511 512 /* Make sure we are allowed to bind here. */ 513 if (sk->sk_prot->get_port(sk, snum)) { 514 inet->inet_saddr = inet->inet_rcv_saddr = 0; 515 err = -EADDRINUSE; 516 goto out_release_sock; 517 } 518 519 if (inet->inet_rcv_saddr) 520 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 521 if (snum) 522 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 523 inet->inet_sport = htons(inet->inet_num); 524 inet->inet_daddr = 0; 525 inet->inet_dport = 0; 526 sk_dst_reset(sk); 527 err = 0; 528 out_release_sock: 529 release_sock(sk); 530 out: 531 return err; 532 } 533 EXPORT_SYMBOL(inet_bind); 534 535 int inet_dgram_connect(struct socket *sock, struct sockaddr * uaddr, 536 int addr_len, int flags) 537 { 538 struct sock *sk = sock->sk; 539 540 if (addr_len < sizeof(uaddr->sa_family)) 541 return -EINVAL; 542 if (uaddr->sa_family == AF_UNSPEC) 543 return sk->sk_prot->disconnect(sk, flags); 544 545 if (!inet_sk(sk)->inet_num && inet_autobind(sk)) 546 return -EAGAIN; 547 return sk->sk_prot->connect(sk, (struct sockaddr *)uaddr, addr_len); 548 } 549 EXPORT_SYMBOL(inet_dgram_connect); 550 551 static long inet_wait_for_connect(struct sock *sk, long timeo) 552 { 553 DEFINE_WAIT(wait); 554 555 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 556 557 /* Basic assumption: if someone sets sk->sk_err, he _must_ 558 * change state of the socket from TCP_SYN_*. 559 * Connect() does not allow to get error notifications 560 * without closing the socket. 561 */ 562 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 563 release_sock(sk); 564 timeo = schedule_timeout(timeo); 565 lock_sock(sk); 566 if (signal_pending(current) || !timeo) 567 break; 568 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 569 } 570 finish_wait(sk_sleep(sk), &wait); 571 return timeo; 572 } 573 574 /* 575 * Connect to a remote host. There is regrettably still a little 576 * TCP 'magic' in here. 577 */ 578 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 579 int addr_len, int flags) 580 { 581 struct sock *sk = sock->sk; 582 int err; 583 long timeo; 584 585 if (addr_len < sizeof(uaddr->sa_family)) 586 return -EINVAL; 587 588 lock_sock(sk); 589 590 if (uaddr->sa_family == AF_UNSPEC) { 591 err = sk->sk_prot->disconnect(sk, flags); 592 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 593 goto out; 594 } 595 596 switch (sock->state) { 597 default: 598 err = -EINVAL; 599 goto out; 600 case SS_CONNECTED: 601 err = -EISCONN; 602 goto out; 603 case SS_CONNECTING: 604 err = -EALREADY; 605 /* Fall out of switch with err, set for this state */ 606 break; 607 case SS_UNCONNECTED: 608 err = -EISCONN; 609 if (sk->sk_state != TCP_CLOSE) 610 goto out; 611 612 err = sk->sk_prot->connect(sk, uaddr, addr_len); 613 if (err < 0) 614 goto out; 615 616 sock->state = SS_CONNECTING; 617 618 /* Just entered SS_CONNECTING state; the only 619 * difference is that return value in non-blocking 620 * case is EINPROGRESS, rather than EALREADY. 621 */ 622 err = -EINPROGRESS; 623 break; 624 } 625 626 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 627 628 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 629 /* Error code is set above */ 630 if (!timeo || !inet_wait_for_connect(sk, timeo)) 631 goto out; 632 633 err = sock_intr_errno(timeo); 634 if (signal_pending(current)) 635 goto out; 636 } 637 638 /* Connection was closed by RST, timeout, ICMP error 639 * or another process disconnected us. 640 */ 641 if (sk->sk_state == TCP_CLOSE) 642 goto sock_error; 643 644 /* sk->sk_err may be not zero now, if RECVERR was ordered by user 645 * and error was received after socket entered established state. 646 * Hence, it is handled normally after connect() return successfully. 647 */ 648 649 sock->state = SS_CONNECTED; 650 err = 0; 651 out: 652 release_sock(sk); 653 return err; 654 655 sock_error: 656 err = sock_error(sk) ? : -ECONNABORTED; 657 sock->state = SS_UNCONNECTED; 658 if (sk->sk_prot->disconnect(sk, flags)) 659 sock->state = SS_DISCONNECTING; 660 goto out; 661 } 662 EXPORT_SYMBOL(inet_stream_connect); 663 664 /* 665 * Accept a pending connection. The TCP layer now gives BSD semantics. 666 */ 667 668 int inet_accept(struct socket *sock, struct socket *newsock, int flags) 669 { 670 struct sock *sk1 = sock->sk; 671 int err = -EINVAL; 672 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err); 673 674 if (!sk2) 675 goto do_err; 676 677 lock_sock(sk2); 678 679 WARN_ON(!((1 << sk2->sk_state) & 680 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE))); 681 682 sock_graft(sk2, newsock); 683 684 newsock->state = SS_CONNECTED; 685 err = 0; 686 release_sock(sk2); 687 do_err: 688 return err; 689 } 690 EXPORT_SYMBOL(inet_accept); 691 692 693 /* 694 * This does both peername and sockname. 695 */ 696 int inet_getname(struct socket *sock, struct sockaddr *uaddr, 697 int *uaddr_len, int peer) 698 { 699 struct sock *sk = sock->sk; 700 struct inet_sock *inet = inet_sk(sk); 701 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr); 702 703 sin->sin_family = AF_INET; 704 if (peer) { 705 if (!inet->inet_dport || 706 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 707 peer == 1)) 708 return -ENOTCONN; 709 sin->sin_port = inet->inet_dport; 710 sin->sin_addr.s_addr = inet->inet_daddr; 711 } else { 712 __be32 addr = inet->inet_rcv_saddr; 713 if (!addr) 714 addr = inet->inet_saddr; 715 sin->sin_port = inet->inet_sport; 716 sin->sin_addr.s_addr = addr; 717 } 718 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 719 *uaddr_len = sizeof(*sin); 720 return 0; 721 } 722 EXPORT_SYMBOL(inet_getname); 723 724 int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 725 size_t size) 726 { 727 struct sock *sk = sock->sk; 728 729 sock_rps_record_flow(sk); 730 731 /* We may need to bind the socket. */ 732 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 733 inet_autobind(sk)) 734 return -EAGAIN; 735 736 return sk->sk_prot->sendmsg(iocb, sk, msg, size); 737 } 738 EXPORT_SYMBOL(inet_sendmsg); 739 740 ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, 741 size_t size, int flags) 742 { 743 struct sock *sk = sock->sk; 744 745 sock_rps_record_flow(sk); 746 747 /* We may need to bind the socket. */ 748 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 749 inet_autobind(sk)) 750 return -EAGAIN; 751 752 if (sk->sk_prot->sendpage) 753 return sk->sk_prot->sendpage(sk, page, offset, size, flags); 754 return sock_no_sendpage(sock, page, offset, size, flags); 755 } 756 EXPORT_SYMBOL(inet_sendpage); 757 758 int inet_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 759 size_t size, int flags) 760 { 761 struct sock *sk = sock->sk; 762 int addr_len = 0; 763 int err; 764 765 sock_rps_record_flow(sk); 766 767 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, 768 flags & ~MSG_DONTWAIT, &addr_len); 769 if (err >= 0) 770 msg->msg_namelen = addr_len; 771 return err; 772 } 773 EXPORT_SYMBOL(inet_recvmsg); 774 775 int inet_shutdown(struct socket *sock, int how) 776 { 777 struct sock *sk = sock->sk; 778 int err = 0; 779 780 /* This should really check to make sure 781 * the socket is a TCP socket. (WHY AC...) 782 */ 783 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and 784 1->2 bit 2 snds. 785 2->3 */ 786 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ 787 return -EINVAL; 788 789 lock_sock(sk); 790 if (sock->state == SS_CONNECTING) { 791 if ((1 << sk->sk_state) & 792 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) 793 sock->state = SS_DISCONNECTING; 794 else 795 sock->state = SS_CONNECTED; 796 } 797 798 switch (sk->sk_state) { 799 case TCP_CLOSE: 800 err = -ENOTCONN; 801 /* Hack to wake up other listeners, who can poll for 802 POLLHUP, even on eg. unconnected UDP sockets -- RR */ 803 default: 804 sk->sk_shutdown |= how; 805 if (sk->sk_prot->shutdown) 806 sk->sk_prot->shutdown(sk, how); 807 break; 808 809 /* Remaining two branches are temporary solution for missing 810 * close() in multithreaded environment. It is _not_ a good idea, 811 * but we have no choice until close() is repaired at VFS level. 812 */ 813 case TCP_LISTEN: 814 if (!(how & RCV_SHUTDOWN)) 815 break; 816 /* Fall through */ 817 case TCP_SYN_SENT: 818 err = sk->sk_prot->disconnect(sk, O_NONBLOCK); 819 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 820 break; 821 } 822 823 /* Wake up anyone sleeping in poll. */ 824 sk->sk_state_change(sk); 825 release_sock(sk); 826 return err; 827 } 828 EXPORT_SYMBOL(inet_shutdown); 829 830 /* 831 * ioctl() calls you can issue on an INET socket. Most of these are 832 * device configuration and stuff and very rarely used. Some ioctls 833 * pass on to the socket itself. 834 * 835 * NOTE: I like the idea of a module for the config stuff. ie ifconfig 836 * loads the devconfigure module does its configuring and unloads it. 837 * There's a good 20K of config code hanging around the kernel. 838 */ 839 840 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 841 { 842 struct sock *sk = sock->sk; 843 int err = 0; 844 struct net *net = sock_net(sk); 845 846 switch (cmd) { 847 case SIOCGSTAMP: 848 err = sock_get_timestamp(sk, (struct timeval __user *)arg); 849 break; 850 case SIOCGSTAMPNS: 851 err = sock_get_timestampns(sk, (struct timespec __user *)arg); 852 break; 853 case SIOCADDRT: 854 case SIOCDELRT: 855 case SIOCRTMSG: 856 err = ip_rt_ioctl(net, cmd, (void __user *)arg); 857 break; 858 case SIOCDARP: 859 case SIOCGARP: 860 case SIOCSARP: 861 err = arp_ioctl(net, cmd, (void __user *)arg); 862 break; 863 case SIOCGIFADDR: 864 case SIOCSIFADDR: 865 case SIOCGIFBRDADDR: 866 case SIOCSIFBRDADDR: 867 case SIOCGIFNETMASK: 868 case SIOCSIFNETMASK: 869 case SIOCGIFDSTADDR: 870 case SIOCSIFDSTADDR: 871 case SIOCSIFPFLAGS: 872 case SIOCGIFPFLAGS: 873 case SIOCSIFFLAGS: 874 err = devinet_ioctl(net, cmd, (void __user *)arg); 875 break; 876 default: 877 if (sk->sk_prot->ioctl) 878 err = sk->sk_prot->ioctl(sk, cmd, arg); 879 else 880 err = -ENOIOCTLCMD; 881 break; 882 } 883 return err; 884 } 885 EXPORT_SYMBOL(inet_ioctl); 886 887 #ifdef CONFIG_COMPAT 888 int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 889 { 890 struct sock *sk = sock->sk; 891 int err = -ENOIOCTLCMD; 892 893 if (sk->sk_prot->compat_ioctl) 894 err = sk->sk_prot->compat_ioctl(sk, cmd, arg); 895 896 return err; 897 } 898 #endif 899 900 const struct proto_ops inet_stream_ops = { 901 .family = PF_INET, 902 .owner = THIS_MODULE, 903 .release = inet_release, 904 .bind = inet_bind, 905 .connect = inet_stream_connect, 906 .socketpair = sock_no_socketpair, 907 .accept = inet_accept, 908 .getname = inet_getname, 909 .poll = tcp_poll, 910 .ioctl = inet_ioctl, 911 .listen = inet_listen, 912 .shutdown = inet_shutdown, 913 .setsockopt = sock_common_setsockopt, 914 .getsockopt = sock_common_getsockopt, 915 .sendmsg = inet_sendmsg, 916 .recvmsg = inet_recvmsg, 917 .mmap = sock_no_mmap, 918 .sendpage = inet_sendpage, 919 .splice_read = tcp_splice_read, 920 #ifdef CONFIG_COMPAT 921 .compat_setsockopt = compat_sock_common_setsockopt, 922 .compat_getsockopt = compat_sock_common_getsockopt, 923 .compat_ioctl = inet_compat_ioctl, 924 #endif 925 }; 926 EXPORT_SYMBOL(inet_stream_ops); 927 928 const struct proto_ops inet_dgram_ops = { 929 .family = PF_INET, 930 .owner = THIS_MODULE, 931 .release = inet_release, 932 .bind = inet_bind, 933 .connect = inet_dgram_connect, 934 .socketpair = sock_no_socketpair, 935 .accept = sock_no_accept, 936 .getname = inet_getname, 937 .poll = udp_poll, 938 .ioctl = inet_ioctl, 939 .listen = sock_no_listen, 940 .shutdown = inet_shutdown, 941 .setsockopt = sock_common_setsockopt, 942 .getsockopt = sock_common_getsockopt, 943 .sendmsg = inet_sendmsg, 944 .recvmsg = inet_recvmsg, 945 .mmap = sock_no_mmap, 946 .sendpage = inet_sendpage, 947 #ifdef CONFIG_COMPAT 948 .compat_setsockopt = compat_sock_common_setsockopt, 949 .compat_getsockopt = compat_sock_common_getsockopt, 950 .compat_ioctl = inet_compat_ioctl, 951 #endif 952 }; 953 EXPORT_SYMBOL(inet_dgram_ops); 954 955 /* 956 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 957 * udp_poll 958 */ 959 static const struct proto_ops inet_sockraw_ops = { 960 .family = PF_INET, 961 .owner = THIS_MODULE, 962 .release = inet_release, 963 .bind = inet_bind, 964 .connect = inet_dgram_connect, 965 .socketpair = sock_no_socketpair, 966 .accept = sock_no_accept, 967 .getname = inet_getname, 968 .poll = datagram_poll, 969 .ioctl = inet_ioctl, 970 .listen = sock_no_listen, 971 .shutdown = inet_shutdown, 972 .setsockopt = sock_common_setsockopt, 973 .getsockopt = sock_common_getsockopt, 974 .sendmsg = inet_sendmsg, 975 .recvmsg = inet_recvmsg, 976 .mmap = sock_no_mmap, 977 .sendpage = inet_sendpage, 978 #ifdef CONFIG_COMPAT 979 .compat_setsockopt = compat_sock_common_setsockopt, 980 .compat_getsockopt = compat_sock_common_getsockopt, 981 .compat_ioctl = inet_compat_ioctl, 982 #endif 983 }; 984 985 static const struct net_proto_family inet_family_ops = { 986 .family = PF_INET, 987 .create = inet_create, 988 .owner = THIS_MODULE, 989 }; 990 991 /* Upon startup we insert all the elements in inetsw_array[] into 992 * the linked list inetsw. 993 */ 994 static struct inet_protosw inetsw_array[] = 995 { 996 { 997 .type = SOCK_STREAM, 998 .protocol = IPPROTO_TCP, 999 .prot = &tcp_prot, 1000 .ops = &inet_stream_ops, 1001 .no_check = 0, 1002 .flags = INET_PROTOSW_PERMANENT | 1003 INET_PROTOSW_ICSK, 1004 }, 1005 1006 { 1007 .type = SOCK_DGRAM, 1008 .protocol = IPPROTO_UDP, 1009 .prot = &udp_prot, 1010 .ops = &inet_dgram_ops, 1011 .no_check = UDP_CSUM_DEFAULT, 1012 .flags = INET_PROTOSW_PERMANENT, 1013 }, 1014 1015 { 1016 .type = SOCK_DGRAM, 1017 .protocol = IPPROTO_ICMP, 1018 .prot = &ping_prot, 1019 .ops = &inet_dgram_ops, 1020 .no_check = UDP_CSUM_DEFAULT, 1021 .flags = INET_PROTOSW_REUSE, 1022 }, 1023 1024 { 1025 .type = SOCK_RAW, 1026 .protocol = IPPROTO_IP, /* wild card */ 1027 .prot = &raw_prot, 1028 .ops = &inet_sockraw_ops, 1029 .no_check = UDP_CSUM_DEFAULT, 1030 .flags = INET_PROTOSW_REUSE, 1031 } 1032 }; 1033 1034 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) 1035 1036 void inet_register_protosw(struct inet_protosw *p) 1037 { 1038 struct list_head *lh; 1039 struct inet_protosw *answer; 1040 int protocol = p->protocol; 1041 struct list_head *last_perm; 1042 1043 spin_lock_bh(&inetsw_lock); 1044 1045 if (p->type >= SOCK_MAX) 1046 goto out_illegal; 1047 1048 /* If we are trying to override a permanent protocol, bail. */ 1049 answer = NULL; 1050 last_perm = &inetsw[p->type]; 1051 list_for_each(lh, &inetsw[p->type]) { 1052 answer = list_entry(lh, struct inet_protosw, list); 1053 1054 /* Check only the non-wild match. */ 1055 if (INET_PROTOSW_PERMANENT & answer->flags) { 1056 if (protocol == answer->protocol) 1057 break; 1058 last_perm = lh; 1059 } 1060 1061 answer = NULL; 1062 } 1063 if (answer) 1064 goto out_permanent; 1065 1066 /* Add the new entry after the last permanent entry if any, so that 1067 * the new entry does not override a permanent entry when matched with 1068 * a wild-card protocol. But it is allowed to override any existing 1069 * non-permanent entry. This means that when we remove this entry, the 1070 * system automatically returns to the old behavior. 1071 */ 1072 list_add_rcu(&p->list, last_perm); 1073 out: 1074 spin_unlock_bh(&inetsw_lock); 1075 1076 return; 1077 1078 out_permanent: 1079 printk(KERN_ERR "Attempt to override permanent protocol %d.\n", 1080 protocol); 1081 goto out; 1082 1083 out_illegal: 1084 printk(KERN_ERR 1085 "Ignoring attempt to register invalid socket type %d.\n", 1086 p->type); 1087 goto out; 1088 } 1089 EXPORT_SYMBOL(inet_register_protosw); 1090 1091 void inet_unregister_protosw(struct inet_protosw *p) 1092 { 1093 if (INET_PROTOSW_PERMANENT & p->flags) { 1094 printk(KERN_ERR 1095 "Attempt to unregister permanent protocol %d.\n", 1096 p->protocol); 1097 } else { 1098 spin_lock_bh(&inetsw_lock); 1099 list_del_rcu(&p->list); 1100 spin_unlock_bh(&inetsw_lock); 1101 1102 synchronize_net(); 1103 } 1104 } 1105 EXPORT_SYMBOL(inet_unregister_protosw); 1106 1107 /* 1108 * Shall we try to damage output packets if routing dev changes? 1109 */ 1110 1111 int sysctl_ip_dynaddr __read_mostly; 1112 1113 static int inet_sk_reselect_saddr(struct sock *sk) 1114 { 1115 struct inet_sock *inet = inet_sk(sk); 1116 __be32 old_saddr = inet->inet_saddr; 1117 __be32 daddr = inet->inet_daddr; 1118 struct flowi4 *fl4; 1119 struct rtable *rt; 1120 __be32 new_saddr; 1121 struct ip_options_rcu *inet_opt; 1122 1123 inet_opt = rcu_dereference_protected(inet->inet_opt, 1124 sock_owned_by_user(sk)); 1125 if (inet_opt && inet_opt->opt.srr) 1126 daddr = inet_opt->opt.faddr; 1127 1128 /* Query new route. */ 1129 fl4 = &inet->cork.fl.u.ip4; 1130 rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk), 1131 sk->sk_bound_dev_if, sk->sk_protocol, 1132 inet->inet_sport, inet->inet_dport, sk, false); 1133 if (IS_ERR(rt)) 1134 return PTR_ERR(rt); 1135 1136 sk_setup_caps(sk, &rt->dst); 1137 1138 new_saddr = fl4->saddr; 1139 1140 if (new_saddr == old_saddr) 1141 return 0; 1142 1143 if (sysctl_ip_dynaddr > 1) { 1144 printk(KERN_INFO "%s(): shifting inet->saddr from %pI4 to %pI4\n", 1145 __func__, &old_saddr, &new_saddr); 1146 } 1147 1148 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr; 1149 1150 /* 1151 * XXX The only one ugly spot where we need to 1152 * XXX really change the sockets identity after 1153 * XXX it has entered the hashes. -DaveM 1154 * 1155 * Besides that, it does not check for connection 1156 * uniqueness. Wait for troubles. 1157 */ 1158 __sk_prot_rehash(sk); 1159 return 0; 1160 } 1161 1162 int inet_sk_rebuild_header(struct sock *sk) 1163 { 1164 struct inet_sock *inet = inet_sk(sk); 1165 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); 1166 __be32 daddr; 1167 struct ip_options_rcu *inet_opt; 1168 struct flowi4 *fl4; 1169 int err; 1170 1171 /* Route is OK, nothing to do. */ 1172 if (rt) 1173 return 0; 1174 1175 /* Reroute. */ 1176 rcu_read_lock(); 1177 inet_opt = rcu_dereference(inet->inet_opt); 1178 daddr = inet->inet_daddr; 1179 if (inet_opt && inet_opt->opt.srr) 1180 daddr = inet_opt->opt.faddr; 1181 rcu_read_unlock(); 1182 fl4 = &inet->cork.fl.u.ip4; 1183 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr, 1184 inet->inet_dport, inet->inet_sport, 1185 sk->sk_protocol, RT_CONN_FLAGS(sk), 1186 sk->sk_bound_dev_if); 1187 if (!IS_ERR(rt)) { 1188 err = 0; 1189 sk_setup_caps(sk, &rt->dst); 1190 } else { 1191 err = PTR_ERR(rt); 1192 1193 /* Routing failed... */ 1194 sk->sk_route_caps = 0; 1195 /* 1196 * Other protocols have to map its equivalent state to TCP_SYN_SENT. 1197 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme 1198 */ 1199 if (!sysctl_ip_dynaddr || 1200 sk->sk_state != TCP_SYN_SENT || 1201 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 1202 (err = inet_sk_reselect_saddr(sk)) != 0) 1203 sk->sk_err_soft = -err; 1204 } 1205 1206 return err; 1207 } 1208 EXPORT_SYMBOL(inet_sk_rebuild_header); 1209 1210 static int inet_gso_send_check(struct sk_buff *skb) 1211 { 1212 const struct iphdr *iph; 1213 const struct net_protocol *ops; 1214 int proto; 1215 int ihl; 1216 int err = -EINVAL; 1217 1218 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1219 goto out; 1220 1221 iph = ip_hdr(skb); 1222 ihl = iph->ihl * 4; 1223 if (ihl < sizeof(*iph)) 1224 goto out; 1225 1226 if (unlikely(!pskb_may_pull(skb, ihl))) 1227 goto out; 1228 1229 __skb_pull(skb, ihl); 1230 skb_reset_transport_header(skb); 1231 iph = ip_hdr(skb); 1232 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1233 err = -EPROTONOSUPPORT; 1234 1235 rcu_read_lock(); 1236 ops = rcu_dereference(inet_protos[proto]); 1237 if (likely(ops && ops->gso_send_check)) 1238 err = ops->gso_send_check(skb); 1239 rcu_read_unlock(); 1240 1241 out: 1242 return err; 1243 } 1244 1245 static struct sk_buff *inet_gso_segment(struct sk_buff *skb, u32 features) 1246 { 1247 struct sk_buff *segs = ERR_PTR(-EINVAL); 1248 struct iphdr *iph; 1249 const struct net_protocol *ops; 1250 int proto; 1251 int ihl; 1252 int id; 1253 unsigned int offset = 0; 1254 1255 if (!(features & NETIF_F_V4_CSUM)) 1256 features &= ~NETIF_F_SG; 1257 1258 if (unlikely(skb_shinfo(skb)->gso_type & 1259 ~(SKB_GSO_TCPV4 | 1260 SKB_GSO_UDP | 1261 SKB_GSO_DODGY | 1262 SKB_GSO_TCP_ECN | 1263 0))) 1264 goto out; 1265 1266 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1267 goto out; 1268 1269 iph = ip_hdr(skb); 1270 ihl = iph->ihl * 4; 1271 if (ihl < sizeof(*iph)) 1272 goto out; 1273 1274 if (unlikely(!pskb_may_pull(skb, ihl))) 1275 goto out; 1276 1277 __skb_pull(skb, ihl); 1278 skb_reset_transport_header(skb); 1279 iph = ip_hdr(skb); 1280 id = ntohs(iph->id); 1281 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1282 segs = ERR_PTR(-EPROTONOSUPPORT); 1283 1284 rcu_read_lock(); 1285 ops = rcu_dereference(inet_protos[proto]); 1286 if (likely(ops && ops->gso_segment)) 1287 segs = ops->gso_segment(skb, features); 1288 rcu_read_unlock(); 1289 1290 if (!segs || IS_ERR(segs)) 1291 goto out; 1292 1293 skb = segs; 1294 do { 1295 iph = ip_hdr(skb); 1296 if (proto == IPPROTO_UDP) { 1297 iph->id = htons(id); 1298 iph->frag_off = htons(offset >> 3); 1299 if (skb->next != NULL) 1300 iph->frag_off |= htons(IP_MF); 1301 offset += (skb->len - skb->mac_len - iph->ihl * 4); 1302 } else 1303 iph->id = htons(id++); 1304 iph->tot_len = htons(skb->len - skb->mac_len); 1305 iph->check = 0; 1306 iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl); 1307 } while ((skb = skb->next)); 1308 1309 out: 1310 return segs; 1311 } 1312 1313 static struct sk_buff **inet_gro_receive(struct sk_buff **head, 1314 struct sk_buff *skb) 1315 { 1316 const struct net_protocol *ops; 1317 struct sk_buff **pp = NULL; 1318 struct sk_buff *p; 1319 const struct iphdr *iph; 1320 unsigned int hlen; 1321 unsigned int off; 1322 unsigned int id; 1323 int flush = 1; 1324 int proto; 1325 1326 off = skb_gro_offset(skb); 1327 hlen = off + sizeof(*iph); 1328 iph = skb_gro_header_fast(skb, off); 1329 if (skb_gro_header_hard(skb, hlen)) { 1330 iph = skb_gro_header_slow(skb, hlen, off); 1331 if (unlikely(!iph)) 1332 goto out; 1333 } 1334 1335 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1336 1337 rcu_read_lock(); 1338 ops = rcu_dereference(inet_protos[proto]); 1339 if (!ops || !ops->gro_receive) 1340 goto out_unlock; 1341 1342 if (*(u8 *)iph != 0x45) 1343 goto out_unlock; 1344 1345 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) 1346 goto out_unlock; 1347 1348 id = ntohl(*(__be32 *)&iph->id); 1349 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id ^ IP_DF)); 1350 id >>= 16; 1351 1352 for (p = *head; p; p = p->next) { 1353 struct iphdr *iph2; 1354 1355 if (!NAPI_GRO_CB(p)->same_flow) 1356 continue; 1357 1358 iph2 = ip_hdr(p); 1359 1360 if ((iph->protocol ^ iph2->protocol) | 1361 (iph->tos ^ iph2->tos) | 1362 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) | 1363 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) { 1364 NAPI_GRO_CB(p)->same_flow = 0; 1365 continue; 1366 } 1367 1368 /* All fields must match except length and checksum. */ 1369 NAPI_GRO_CB(p)->flush |= 1370 (iph->ttl ^ iph2->ttl) | 1371 ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id); 1372 1373 NAPI_GRO_CB(p)->flush |= flush; 1374 } 1375 1376 NAPI_GRO_CB(skb)->flush |= flush; 1377 skb_gro_pull(skb, sizeof(*iph)); 1378 skb_set_transport_header(skb, skb_gro_offset(skb)); 1379 1380 pp = ops->gro_receive(head, skb); 1381 1382 out_unlock: 1383 rcu_read_unlock(); 1384 1385 out: 1386 NAPI_GRO_CB(skb)->flush |= flush; 1387 1388 return pp; 1389 } 1390 1391 static int inet_gro_complete(struct sk_buff *skb) 1392 { 1393 const struct net_protocol *ops; 1394 struct iphdr *iph = ip_hdr(skb); 1395 int proto = iph->protocol & (MAX_INET_PROTOS - 1); 1396 int err = -ENOSYS; 1397 __be16 newlen = htons(skb->len - skb_network_offset(skb)); 1398 1399 csum_replace2(&iph->check, iph->tot_len, newlen); 1400 iph->tot_len = newlen; 1401 1402 rcu_read_lock(); 1403 ops = rcu_dereference(inet_protos[proto]); 1404 if (WARN_ON(!ops || !ops->gro_complete)) 1405 goto out_unlock; 1406 1407 err = ops->gro_complete(skb); 1408 1409 out_unlock: 1410 rcu_read_unlock(); 1411 1412 return err; 1413 } 1414 1415 int inet_ctl_sock_create(struct sock **sk, unsigned short family, 1416 unsigned short type, unsigned char protocol, 1417 struct net *net) 1418 { 1419 struct socket *sock; 1420 int rc = sock_create_kern(family, type, protocol, &sock); 1421 1422 if (rc == 0) { 1423 *sk = sock->sk; 1424 (*sk)->sk_allocation = GFP_ATOMIC; 1425 /* 1426 * Unhash it so that IP input processing does not even see it, 1427 * we do not wish this socket to see incoming packets. 1428 */ 1429 (*sk)->sk_prot->unhash(*sk); 1430 1431 sk_change_net(*sk, net); 1432 } 1433 return rc; 1434 } 1435 EXPORT_SYMBOL_GPL(inet_ctl_sock_create); 1436 1437 unsigned long snmp_fold_field(void __percpu *mib[], int offt) 1438 { 1439 unsigned long res = 0; 1440 int i; 1441 1442 for_each_possible_cpu(i) { 1443 res += *(((unsigned long *) per_cpu_ptr(mib[0], i)) + offt); 1444 res += *(((unsigned long *) per_cpu_ptr(mib[1], i)) + offt); 1445 } 1446 return res; 1447 } 1448 EXPORT_SYMBOL_GPL(snmp_fold_field); 1449 1450 #if BITS_PER_LONG==32 1451 1452 u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t syncp_offset) 1453 { 1454 u64 res = 0; 1455 int cpu; 1456 1457 for_each_possible_cpu(cpu) { 1458 void *bhptr, *userptr; 1459 struct u64_stats_sync *syncp; 1460 u64 v_bh, v_user; 1461 unsigned int start; 1462 1463 /* first mib used by softirq context, we must use _bh() accessors */ 1464 bhptr = per_cpu_ptr(SNMP_STAT_BHPTR(mib), cpu); 1465 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset); 1466 do { 1467 start = u64_stats_fetch_begin_bh(syncp); 1468 v_bh = *(((u64 *) bhptr) + offt); 1469 } while (u64_stats_fetch_retry_bh(syncp, start)); 1470 1471 /* second mib used in USER context */ 1472 userptr = per_cpu_ptr(SNMP_STAT_USRPTR(mib), cpu); 1473 syncp = (struct u64_stats_sync *)(userptr + syncp_offset); 1474 do { 1475 start = u64_stats_fetch_begin(syncp); 1476 v_user = *(((u64 *) userptr) + offt); 1477 } while (u64_stats_fetch_retry(syncp, start)); 1478 1479 res += v_bh + v_user; 1480 } 1481 return res; 1482 } 1483 EXPORT_SYMBOL_GPL(snmp_fold_field64); 1484 #endif 1485 1486 int snmp_mib_init(void __percpu *ptr[2], size_t mibsize, size_t align) 1487 { 1488 BUG_ON(ptr == NULL); 1489 ptr[0] = __alloc_percpu(mibsize, align); 1490 if (!ptr[0]) 1491 goto err0; 1492 ptr[1] = __alloc_percpu(mibsize, align); 1493 if (!ptr[1]) 1494 goto err1; 1495 return 0; 1496 err1: 1497 free_percpu(ptr[0]); 1498 ptr[0] = NULL; 1499 err0: 1500 return -ENOMEM; 1501 } 1502 EXPORT_SYMBOL_GPL(snmp_mib_init); 1503 1504 void snmp_mib_free(void __percpu *ptr[2]) 1505 { 1506 BUG_ON(ptr == NULL); 1507 free_percpu(ptr[0]); 1508 free_percpu(ptr[1]); 1509 ptr[0] = ptr[1] = NULL; 1510 } 1511 EXPORT_SYMBOL_GPL(snmp_mib_free); 1512 1513 #ifdef CONFIG_IP_MULTICAST 1514 static const struct net_protocol igmp_protocol = { 1515 .handler = igmp_rcv, 1516 .netns_ok = 1, 1517 }; 1518 #endif 1519 1520 static const struct net_protocol tcp_protocol = { 1521 .handler = tcp_v4_rcv, 1522 .err_handler = tcp_v4_err, 1523 .gso_send_check = tcp_v4_gso_send_check, 1524 .gso_segment = tcp_tso_segment, 1525 .gro_receive = tcp4_gro_receive, 1526 .gro_complete = tcp4_gro_complete, 1527 .no_policy = 1, 1528 .netns_ok = 1, 1529 }; 1530 1531 static const struct net_protocol udp_protocol = { 1532 .handler = udp_rcv, 1533 .err_handler = udp_err, 1534 .gso_send_check = udp4_ufo_send_check, 1535 .gso_segment = udp4_ufo_fragment, 1536 .no_policy = 1, 1537 .netns_ok = 1, 1538 }; 1539 1540 static const struct net_protocol icmp_protocol = { 1541 .handler = icmp_rcv, 1542 .err_handler = ping_err, 1543 .no_policy = 1, 1544 .netns_ok = 1, 1545 }; 1546 1547 static __net_init int ipv4_mib_init_net(struct net *net) 1548 { 1549 if (snmp_mib_init((void __percpu **)net->mib.tcp_statistics, 1550 sizeof(struct tcp_mib), 1551 __alignof__(struct tcp_mib)) < 0) 1552 goto err_tcp_mib; 1553 if (snmp_mib_init((void __percpu **)net->mib.ip_statistics, 1554 sizeof(struct ipstats_mib), 1555 __alignof__(struct ipstats_mib)) < 0) 1556 goto err_ip_mib; 1557 if (snmp_mib_init((void __percpu **)net->mib.net_statistics, 1558 sizeof(struct linux_mib), 1559 __alignof__(struct linux_mib)) < 0) 1560 goto err_net_mib; 1561 if (snmp_mib_init((void __percpu **)net->mib.udp_statistics, 1562 sizeof(struct udp_mib), 1563 __alignof__(struct udp_mib)) < 0) 1564 goto err_udp_mib; 1565 if (snmp_mib_init((void __percpu **)net->mib.udplite_statistics, 1566 sizeof(struct udp_mib), 1567 __alignof__(struct udp_mib)) < 0) 1568 goto err_udplite_mib; 1569 if (snmp_mib_init((void __percpu **)net->mib.icmp_statistics, 1570 sizeof(struct icmp_mib), 1571 __alignof__(struct icmp_mib)) < 0) 1572 goto err_icmp_mib; 1573 if (snmp_mib_init((void __percpu **)net->mib.icmpmsg_statistics, 1574 sizeof(struct icmpmsg_mib), 1575 __alignof__(struct icmpmsg_mib)) < 0) 1576 goto err_icmpmsg_mib; 1577 1578 tcp_mib_init(net); 1579 return 0; 1580 1581 err_icmpmsg_mib: 1582 snmp_mib_free((void __percpu **)net->mib.icmp_statistics); 1583 err_icmp_mib: 1584 snmp_mib_free((void __percpu **)net->mib.udplite_statistics); 1585 err_udplite_mib: 1586 snmp_mib_free((void __percpu **)net->mib.udp_statistics); 1587 err_udp_mib: 1588 snmp_mib_free((void __percpu **)net->mib.net_statistics); 1589 err_net_mib: 1590 snmp_mib_free((void __percpu **)net->mib.ip_statistics); 1591 err_ip_mib: 1592 snmp_mib_free((void __percpu **)net->mib.tcp_statistics); 1593 err_tcp_mib: 1594 return -ENOMEM; 1595 } 1596 1597 static __net_exit void ipv4_mib_exit_net(struct net *net) 1598 { 1599 snmp_mib_free((void __percpu **)net->mib.icmpmsg_statistics); 1600 snmp_mib_free((void __percpu **)net->mib.icmp_statistics); 1601 snmp_mib_free((void __percpu **)net->mib.udplite_statistics); 1602 snmp_mib_free((void __percpu **)net->mib.udp_statistics); 1603 snmp_mib_free((void __percpu **)net->mib.net_statistics); 1604 snmp_mib_free((void __percpu **)net->mib.ip_statistics); 1605 snmp_mib_free((void __percpu **)net->mib.tcp_statistics); 1606 } 1607 1608 static __net_initdata struct pernet_operations ipv4_mib_ops = { 1609 .init = ipv4_mib_init_net, 1610 .exit = ipv4_mib_exit_net, 1611 }; 1612 1613 static int __init init_ipv4_mibs(void) 1614 { 1615 return register_pernet_subsys(&ipv4_mib_ops); 1616 } 1617 1618 static int ipv4_proc_init(void); 1619 1620 /* 1621 * IP protocol layer initialiser 1622 */ 1623 1624 static struct packet_type ip_packet_type __read_mostly = { 1625 .type = cpu_to_be16(ETH_P_IP), 1626 .func = ip_rcv, 1627 .gso_send_check = inet_gso_send_check, 1628 .gso_segment = inet_gso_segment, 1629 .gro_receive = inet_gro_receive, 1630 .gro_complete = inet_gro_complete, 1631 }; 1632 1633 static int __init inet_init(void) 1634 { 1635 struct sk_buff *dummy_skb; 1636 struct inet_protosw *q; 1637 struct list_head *r; 1638 int rc = -EINVAL; 1639 1640 BUILD_BUG_ON(sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb)); 1641 1642 sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL); 1643 if (!sysctl_local_reserved_ports) 1644 goto out; 1645 1646 rc = proto_register(&tcp_prot, 1); 1647 if (rc) 1648 goto out_free_reserved_ports; 1649 1650 rc = proto_register(&udp_prot, 1); 1651 if (rc) 1652 goto out_unregister_tcp_proto; 1653 1654 rc = proto_register(&raw_prot, 1); 1655 if (rc) 1656 goto out_unregister_udp_proto; 1657 1658 rc = proto_register(&ping_prot, 1); 1659 if (rc) 1660 goto out_unregister_raw_proto; 1661 1662 /* 1663 * Tell SOCKET that we are alive... 1664 */ 1665 1666 (void)sock_register(&inet_family_ops); 1667 1668 #ifdef CONFIG_SYSCTL 1669 ip_static_sysctl_init(); 1670 #endif 1671 1672 /* 1673 * Add all the base protocols. 1674 */ 1675 1676 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 1677 printk(KERN_CRIT "inet_init: Cannot add ICMP protocol\n"); 1678 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) 1679 printk(KERN_CRIT "inet_init: Cannot add UDP protocol\n"); 1680 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) 1681 printk(KERN_CRIT "inet_init: Cannot add TCP protocol\n"); 1682 #ifdef CONFIG_IP_MULTICAST 1683 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 1684 printk(KERN_CRIT "inet_init: Cannot add IGMP protocol\n"); 1685 #endif 1686 1687 /* Register the socket-side information for inet_create. */ 1688 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 1689 INIT_LIST_HEAD(r); 1690 1691 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 1692 inet_register_protosw(q); 1693 1694 /* 1695 * Set the ARP module up 1696 */ 1697 1698 arp_init(); 1699 1700 /* 1701 * Set the IP module up 1702 */ 1703 1704 ip_init(); 1705 1706 tcp_v4_init(); 1707 1708 /* Setup TCP slab cache for open requests. */ 1709 tcp_init(); 1710 1711 /* Setup UDP memory threshold */ 1712 udp_init(); 1713 1714 /* Add UDP-Lite (RFC 3828) */ 1715 udplite4_register(); 1716 1717 ping_init(); 1718 1719 /* 1720 * Set the ICMP layer up 1721 */ 1722 1723 if (icmp_init() < 0) 1724 panic("Failed to create the ICMP control socket.\n"); 1725 1726 /* 1727 * Initialise the multicast router 1728 */ 1729 #if defined(CONFIG_IP_MROUTE) 1730 if (ip_mr_init()) 1731 printk(KERN_CRIT "inet_init: Cannot init ipv4 mroute\n"); 1732 #endif 1733 /* 1734 * Initialise per-cpu ipv4 mibs 1735 */ 1736 1737 if (init_ipv4_mibs()) 1738 printk(KERN_CRIT "inet_init: Cannot init ipv4 mibs\n"); 1739 1740 ipv4_proc_init(); 1741 1742 ipfrag_init(); 1743 1744 dev_add_pack(&ip_packet_type); 1745 1746 rc = 0; 1747 out: 1748 return rc; 1749 out_unregister_raw_proto: 1750 proto_unregister(&raw_prot); 1751 out_unregister_udp_proto: 1752 proto_unregister(&udp_prot); 1753 out_unregister_tcp_proto: 1754 proto_unregister(&tcp_prot); 1755 out_free_reserved_ports: 1756 kfree(sysctl_local_reserved_ports); 1757 goto out; 1758 } 1759 1760 fs_initcall(inet_init); 1761 1762 /* ------------------------------------------------------------------------ */ 1763 1764 #ifdef CONFIG_PROC_FS 1765 static int __init ipv4_proc_init(void) 1766 { 1767 int rc = 0; 1768 1769 if (raw_proc_init()) 1770 goto out_raw; 1771 if (tcp4_proc_init()) 1772 goto out_tcp; 1773 if (udp4_proc_init()) 1774 goto out_udp; 1775 if (ping_proc_init()) 1776 goto out_ping; 1777 if (ip_misc_proc_init()) 1778 goto out_misc; 1779 out: 1780 return rc; 1781 out_misc: 1782 ping_proc_exit(); 1783 out_ping: 1784 udp4_proc_exit(); 1785 out_udp: 1786 tcp4_proc_exit(); 1787 out_tcp: 1788 raw_proc_exit(); 1789 out_raw: 1790 rc = -ENOMEM; 1791 goto out; 1792 } 1793 1794 #else /* CONFIG_PROC_FS */ 1795 static int __init ipv4_proc_init(void) 1796 { 1797 return 0; 1798 } 1799 #endif /* CONFIG_PROC_FS */ 1800 1801 MODULE_ALIAS_NETPROTO(PF_INET); 1802 1803