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