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 inet->rcv_tos = 0; 385 386 sk_refcnt_debug_inc(sk); 387 388 if (inet->inet_num) { 389 /* It assumes that any protocol which allows 390 * the user to assign a number at socket 391 * creation time automatically 392 * shares. 393 */ 394 inet->inet_sport = htons(inet->inet_num); 395 /* Add to protocol hash chains. */ 396 sk->sk_prot->hash(sk); 397 } 398 399 if (sk->sk_prot->init) { 400 err = sk->sk_prot->init(sk); 401 if (err) 402 sk_common_release(sk); 403 } 404 out: 405 return err; 406 out_rcu_unlock: 407 rcu_read_unlock(); 408 goto out; 409 } 410 411 412 /* 413 * The peer socket should always be NULL (or else). When we call this 414 * function we are destroying the object and from then on nobody 415 * should refer to it. 416 */ 417 int inet_release(struct socket *sock) 418 { 419 struct sock *sk = sock->sk; 420 421 if (sk) { 422 long timeout; 423 424 sock_rps_reset_flow(sk); 425 426 /* Applications forget to leave groups before exiting */ 427 ip_mc_drop_socket(sk); 428 429 /* If linger is set, we don't return until the close 430 * is complete. Otherwise we return immediately. The 431 * actually closing is done the same either way. 432 * 433 * If the close is due to the process exiting, we never 434 * linger.. 435 */ 436 timeout = 0; 437 if (sock_flag(sk, SOCK_LINGER) && 438 !(current->flags & PF_EXITING)) 439 timeout = sk->sk_lingertime; 440 sock->sk = NULL; 441 sk->sk_prot->close(sk, timeout); 442 } 443 return 0; 444 } 445 EXPORT_SYMBOL(inet_release); 446 447 /* It is off by default, see below. */ 448 int sysctl_ip_nonlocal_bind __read_mostly; 449 EXPORT_SYMBOL(sysctl_ip_nonlocal_bind); 450 451 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 452 { 453 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 454 struct sock *sk = sock->sk; 455 struct inet_sock *inet = inet_sk(sk); 456 unsigned short snum; 457 int chk_addr_ret; 458 int err; 459 460 /* If the socket has its own bind function then use it. (RAW) */ 461 if (sk->sk_prot->bind) { 462 err = sk->sk_prot->bind(sk, uaddr, addr_len); 463 goto out; 464 } 465 err = -EINVAL; 466 if (addr_len < sizeof(struct sockaddr_in)) 467 goto out; 468 469 if (addr->sin_family != AF_INET) { 470 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET) 471 * only if s_addr is INADDR_ANY. 472 */ 473 err = -EAFNOSUPPORT; 474 if (addr->sin_family != AF_UNSPEC || 475 addr->sin_addr.s_addr != htonl(INADDR_ANY)) 476 goto out; 477 } 478 479 chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr); 480 481 /* Not specified by any standard per-se, however it breaks too 482 * many applications when removed. It is unfortunate since 483 * allowing applications to make a non-local bind solves 484 * several problems with systems using dynamic addressing. 485 * (ie. your servers still start up even if your ISDN link 486 * is temporarily down) 487 */ 488 err = -EADDRNOTAVAIL; 489 if (!sysctl_ip_nonlocal_bind && 490 !(inet->freebind || inet->transparent) && 491 addr->sin_addr.s_addr != htonl(INADDR_ANY) && 492 chk_addr_ret != RTN_LOCAL && 493 chk_addr_ret != RTN_MULTICAST && 494 chk_addr_ret != RTN_BROADCAST) 495 goto out; 496 497 snum = ntohs(addr->sin_port); 498 err = -EACCES; 499 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) 500 goto out; 501 502 /* We keep a pair of addresses. rcv_saddr is the one 503 * used by hash lookups, and saddr is used for transmit. 504 * 505 * In the BSD API these are the same except where it 506 * would be illegal to use them (multicast/broadcast) in 507 * which case the sending device address is used. 508 */ 509 lock_sock(sk); 510 511 /* Check these errors (active socket, double bind). */ 512 err = -EINVAL; 513 if (sk->sk_state != TCP_CLOSE || inet->inet_num) 514 goto out_release_sock; 515 516 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 517 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 518 inet->inet_saddr = 0; /* Use device */ 519 520 /* Make sure we are allowed to bind here. */ 521 if (sk->sk_prot->get_port(sk, snum)) { 522 inet->inet_saddr = inet->inet_rcv_saddr = 0; 523 err = -EADDRINUSE; 524 goto out_release_sock; 525 } 526 527 if (inet->inet_rcv_saddr) 528 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 529 if (snum) 530 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 531 inet->inet_sport = htons(inet->inet_num); 532 inet->inet_daddr = 0; 533 inet->inet_dport = 0; 534 sk_dst_reset(sk); 535 err = 0; 536 out_release_sock: 537 release_sock(sk); 538 out: 539 return err; 540 } 541 EXPORT_SYMBOL(inet_bind); 542 543 int inet_dgram_connect(struct socket *sock, struct sockaddr * uaddr, 544 int addr_len, int flags) 545 { 546 struct sock *sk = sock->sk; 547 548 if (addr_len < sizeof(uaddr->sa_family)) 549 return -EINVAL; 550 if (uaddr->sa_family == AF_UNSPEC) 551 return sk->sk_prot->disconnect(sk, flags); 552 553 if (!inet_sk(sk)->inet_num && inet_autobind(sk)) 554 return -EAGAIN; 555 return sk->sk_prot->connect(sk, (struct sockaddr *)uaddr, addr_len); 556 } 557 EXPORT_SYMBOL(inet_dgram_connect); 558 559 static long inet_wait_for_connect(struct sock *sk, long timeo) 560 { 561 DEFINE_WAIT(wait); 562 563 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 564 565 /* Basic assumption: if someone sets sk->sk_err, he _must_ 566 * change state of the socket from TCP_SYN_*. 567 * Connect() does not allow to get error notifications 568 * without closing the socket. 569 */ 570 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 571 release_sock(sk); 572 timeo = schedule_timeout(timeo); 573 lock_sock(sk); 574 if (signal_pending(current) || !timeo) 575 break; 576 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 577 } 578 finish_wait(sk_sleep(sk), &wait); 579 return timeo; 580 } 581 582 /* 583 * Connect to a remote host. There is regrettably still a little 584 * TCP 'magic' in here. 585 */ 586 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 587 int addr_len, int flags) 588 { 589 struct sock *sk = sock->sk; 590 int err; 591 long timeo; 592 593 if (addr_len < sizeof(uaddr->sa_family)) 594 return -EINVAL; 595 596 lock_sock(sk); 597 598 if (uaddr->sa_family == AF_UNSPEC) { 599 err = sk->sk_prot->disconnect(sk, flags); 600 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 601 goto out; 602 } 603 604 switch (sock->state) { 605 default: 606 err = -EINVAL; 607 goto out; 608 case SS_CONNECTED: 609 err = -EISCONN; 610 goto out; 611 case SS_CONNECTING: 612 err = -EALREADY; 613 /* Fall out of switch with err, set for this state */ 614 break; 615 case SS_UNCONNECTED: 616 err = -EISCONN; 617 if (sk->sk_state != TCP_CLOSE) 618 goto out; 619 620 err = sk->sk_prot->connect(sk, uaddr, addr_len); 621 if (err < 0) 622 goto out; 623 624 sock->state = SS_CONNECTING; 625 626 /* Just entered SS_CONNECTING state; the only 627 * difference is that return value in non-blocking 628 * case is EINPROGRESS, rather than EALREADY. 629 */ 630 err = -EINPROGRESS; 631 break; 632 } 633 634 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 635 636 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 637 /* Error code is set above */ 638 if (!timeo || !inet_wait_for_connect(sk, timeo)) 639 goto out; 640 641 err = sock_intr_errno(timeo); 642 if (signal_pending(current)) 643 goto out; 644 } 645 646 /* Connection was closed by RST, timeout, ICMP error 647 * or another process disconnected us. 648 */ 649 if (sk->sk_state == TCP_CLOSE) 650 goto sock_error; 651 652 /* sk->sk_err may be not zero now, if RECVERR was ordered by user 653 * and error was received after socket entered established state. 654 * Hence, it is handled normally after connect() return successfully. 655 */ 656 657 sock->state = SS_CONNECTED; 658 err = 0; 659 out: 660 release_sock(sk); 661 return err; 662 663 sock_error: 664 err = sock_error(sk) ? : -ECONNABORTED; 665 sock->state = SS_UNCONNECTED; 666 if (sk->sk_prot->disconnect(sk, flags)) 667 sock->state = SS_DISCONNECTING; 668 goto out; 669 } 670 EXPORT_SYMBOL(inet_stream_connect); 671 672 /* 673 * Accept a pending connection. The TCP layer now gives BSD semantics. 674 */ 675 676 int inet_accept(struct socket *sock, struct socket *newsock, int flags) 677 { 678 struct sock *sk1 = sock->sk; 679 int err = -EINVAL; 680 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err); 681 682 if (!sk2) 683 goto do_err; 684 685 lock_sock(sk2); 686 687 sock_rps_record_flow(sk2); 688 WARN_ON(!((1 << sk2->sk_state) & 689 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE))); 690 691 sock_graft(sk2, newsock); 692 693 newsock->state = SS_CONNECTED; 694 err = 0; 695 release_sock(sk2); 696 do_err: 697 return err; 698 } 699 EXPORT_SYMBOL(inet_accept); 700 701 702 /* 703 * This does both peername and sockname. 704 */ 705 int inet_getname(struct socket *sock, struct sockaddr *uaddr, 706 int *uaddr_len, int peer) 707 { 708 struct sock *sk = sock->sk; 709 struct inet_sock *inet = inet_sk(sk); 710 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr); 711 712 sin->sin_family = AF_INET; 713 if (peer) { 714 if (!inet->inet_dport || 715 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 716 peer == 1)) 717 return -ENOTCONN; 718 sin->sin_port = inet->inet_dport; 719 sin->sin_addr.s_addr = inet->inet_daddr; 720 } else { 721 __be32 addr = inet->inet_rcv_saddr; 722 if (!addr) 723 addr = inet->inet_saddr; 724 sin->sin_port = inet->inet_sport; 725 sin->sin_addr.s_addr = addr; 726 } 727 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 728 *uaddr_len = sizeof(*sin); 729 return 0; 730 } 731 EXPORT_SYMBOL(inet_getname); 732 733 int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 734 size_t size) 735 { 736 struct sock *sk = sock->sk; 737 738 sock_rps_record_flow(sk); 739 740 /* We may need to bind the socket. */ 741 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 742 inet_autobind(sk)) 743 return -EAGAIN; 744 745 return sk->sk_prot->sendmsg(iocb, sk, msg, size); 746 } 747 EXPORT_SYMBOL(inet_sendmsg); 748 749 ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, 750 size_t size, int flags) 751 { 752 struct sock *sk = sock->sk; 753 754 sock_rps_record_flow(sk); 755 756 /* We may need to bind the socket. */ 757 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 758 inet_autobind(sk)) 759 return -EAGAIN; 760 761 if (sk->sk_prot->sendpage) 762 return sk->sk_prot->sendpage(sk, page, offset, size, flags); 763 return sock_no_sendpage(sock, page, offset, size, flags); 764 } 765 EXPORT_SYMBOL(inet_sendpage); 766 767 int inet_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 768 size_t size, int flags) 769 { 770 struct sock *sk = sock->sk; 771 int addr_len = 0; 772 int err; 773 774 sock_rps_record_flow(sk); 775 776 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, 777 flags & ~MSG_DONTWAIT, &addr_len); 778 if (err >= 0) 779 msg->msg_namelen = addr_len; 780 return err; 781 } 782 EXPORT_SYMBOL(inet_recvmsg); 783 784 int inet_shutdown(struct socket *sock, int how) 785 { 786 struct sock *sk = sock->sk; 787 int err = 0; 788 789 /* This should really check to make sure 790 * the socket is a TCP socket. (WHY AC...) 791 */ 792 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and 793 1->2 bit 2 snds. 794 2->3 */ 795 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ 796 return -EINVAL; 797 798 lock_sock(sk); 799 if (sock->state == SS_CONNECTING) { 800 if ((1 << sk->sk_state) & 801 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) 802 sock->state = SS_DISCONNECTING; 803 else 804 sock->state = SS_CONNECTED; 805 } 806 807 switch (sk->sk_state) { 808 case TCP_CLOSE: 809 err = -ENOTCONN; 810 /* Hack to wake up other listeners, who can poll for 811 POLLHUP, even on eg. unconnected UDP sockets -- RR */ 812 default: 813 sk->sk_shutdown |= how; 814 if (sk->sk_prot->shutdown) 815 sk->sk_prot->shutdown(sk, how); 816 break; 817 818 /* Remaining two branches are temporary solution for missing 819 * close() in multithreaded environment. It is _not_ a good idea, 820 * but we have no choice until close() is repaired at VFS level. 821 */ 822 case TCP_LISTEN: 823 if (!(how & RCV_SHUTDOWN)) 824 break; 825 /* Fall through */ 826 case TCP_SYN_SENT: 827 err = sk->sk_prot->disconnect(sk, O_NONBLOCK); 828 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 829 break; 830 } 831 832 /* Wake up anyone sleeping in poll. */ 833 sk->sk_state_change(sk); 834 release_sock(sk); 835 return err; 836 } 837 EXPORT_SYMBOL(inet_shutdown); 838 839 /* 840 * ioctl() calls you can issue on an INET socket. Most of these are 841 * device configuration and stuff and very rarely used. Some ioctls 842 * pass on to the socket itself. 843 * 844 * NOTE: I like the idea of a module for the config stuff. ie ifconfig 845 * loads the devconfigure module does its configuring and unloads it. 846 * There's a good 20K of config code hanging around the kernel. 847 */ 848 849 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 850 { 851 struct sock *sk = sock->sk; 852 int err = 0; 853 struct net *net = sock_net(sk); 854 855 switch (cmd) { 856 case SIOCGSTAMP: 857 err = sock_get_timestamp(sk, (struct timeval __user *)arg); 858 break; 859 case SIOCGSTAMPNS: 860 err = sock_get_timestampns(sk, (struct timespec __user *)arg); 861 break; 862 case SIOCADDRT: 863 case SIOCDELRT: 864 case SIOCRTMSG: 865 err = ip_rt_ioctl(net, cmd, (void __user *)arg); 866 break; 867 case SIOCDARP: 868 case SIOCGARP: 869 case SIOCSARP: 870 err = arp_ioctl(net, cmd, (void __user *)arg); 871 break; 872 case SIOCGIFADDR: 873 case SIOCSIFADDR: 874 case SIOCGIFBRDADDR: 875 case SIOCSIFBRDADDR: 876 case SIOCGIFNETMASK: 877 case SIOCSIFNETMASK: 878 case SIOCGIFDSTADDR: 879 case SIOCSIFDSTADDR: 880 case SIOCSIFPFLAGS: 881 case SIOCGIFPFLAGS: 882 case SIOCSIFFLAGS: 883 err = devinet_ioctl(net, cmd, (void __user *)arg); 884 break; 885 default: 886 if (sk->sk_prot->ioctl) 887 err = sk->sk_prot->ioctl(sk, cmd, arg); 888 else 889 err = -ENOIOCTLCMD; 890 break; 891 } 892 return err; 893 } 894 EXPORT_SYMBOL(inet_ioctl); 895 896 #ifdef CONFIG_COMPAT 897 static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 898 { 899 struct sock *sk = sock->sk; 900 int err = -ENOIOCTLCMD; 901 902 if (sk->sk_prot->compat_ioctl) 903 err = sk->sk_prot->compat_ioctl(sk, cmd, arg); 904 905 return err; 906 } 907 #endif 908 909 const struct proto_ops inet_stream_ops = { 910 .family = PF_INET, 911 .owner = THIS_MODULE, 912 .release = inet_release, 913 .bind = inet_bind, 914 .connect = inet_stream_connect, 915 .socketpair = sock_no_socketpair, 916 .accept = inet_accept, 917 .getname = inet_getname, 918 .poll = tcp_poll, 919 .ioctl = inet_ioctl, 920 .listen = inet_listen, 921 .shutdown = inet_shutdown, 922 .setsockopt = sock_common_setsockopt, 923 .getsockopt = sock_common_getsockopt, 924 .sendmsg = inet_sendmsg, 925 .recvmsg = inet_recvmsg, 926 .mmap = sock_no_mmap, 927 .sendpage = inet_sendpage, 928 .splice_read = tcp_splice_read, 929 #ifdef CONFIG_COMPAT 930 .compat_setsockopt = compat_sock_common_setsockopt, 931 .compat_getsockopt = compat_sock_common_getsockopt, 932 .compat_ioctl = inet_compat_ioctl, 933 #endif 934 }; 935 EXPORT_SYMBOL(inet_stream_ops); 936 937 const struct proto_ops inet_dgram_ops = { 938 .family = PF_INET, 939 .owner = THIS_MODULE, 940 .release = inet_release, 941 .bind = inet_bind, 942 .connect = inet_dgram_connect, 943 .socketpair = sock_no_socketpair, 944 .accept = sock_no_accept, 945 .getname = inet_getname, 946 .poll = udp_poll, 947 .ioctl = inet_ioctl, 948 .listen = sock_no_listen, 949 .shutdown = inet_shutdown, 950 .setsockopt = sock_common_setsockopt, 951 .getsockopt = sock_common_getsockopt, 952 .sendmsg = inet_sendmsg, 953 .recvmsg = inet_recvmsg, 954 .mmap = sock_no_mmap, 955 .sendpage = inet_sendpage, 956 #ifdef CONFIG_COMPAT 957 .compat_setsockopt = compat_sock_common_setsockopt, 958 .compat_getsockopt = compat_sock_common_getsockopt, 959 .compat_ioctl = inet_compat_ioctl, 960 #endif 961 }; 962 EXPORT_SYMBOL(inet_dgram_ops); 963 964 /* 965 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 966 * udp_poll 967 */ 968 static const struct proto_ops inet_sockraw_ops = { 969 .family = PF_INET, 970 .owner = THIS_MODULE, 971 .release = inet_release, 972 .bind = inet_bind, 973 .connect = inet_dgram_connect, 974 .socketpair = sock_no_socketpair, 975 .accept = sock_no_accept, 976 .getname = inet_getname, 977 .poll = datagram_poll, 978 .ioctl = inet_ioctl, 979 .listen = sock_no_listen, 980 .shutdown = inet_shutdown, 981 .setsockopt = sock_common_setsockopt, 982 .getsockopt = sock_common_getsockopt, 983 .sendmsg = inet_sendmsg, 984 .recvmsg = inet_recvmsg, 985 .mmap = sock_no_mmap, 986 .sendpage = inet_sendpage, 987 #ifdef CONFIG_COMPAT 988 .compat_setsockopt = compat_sock_common_setsockopt, 989 .compat_getsockopt = compat_sock_common_getsockopt, 990 .compat_ioctl = inet_compat_ioctl, 991 #endif 992 }; 993 994 static const struct net_proto_family inet_family_ops = { 995 .family = PF_INET, 996 .create = inet_create, 997 .owner = THIS_MODULE, 998 }; 999 1000 /* Upon startup we insert all the elements in inetsw_array[] into 1001 * the linked list inetsw. 1002 */ 1003 static struct inet_protosw inetsw_array[] = 1004 { 1005 { 1006 .type = SOCK_STREAM, 1007 .protocol = IPPROTO_TCP, 1008 .prot = &tcp_prot, 1009 .ops = &inet_stream_ops, 1010 .no_check = 0, 1011 .flags = INET_PROTOSW_PERMANENT | 1012 INET_PROTOSW_ICSK, 1013 }, 1014 1015 { 1016 .type = SOCK_DGRAM, 1017 .protocol = IPPROTO_UDP, 1018 .prot = &udp_prot, 1019 .ops = &inet_dgram_ops, 1020 .no_check = UDP_CSUM_DEFAULT, 1021 .flags = INET_PROTOSW_PERMANENT, 1022 }, 1023 1024 { 1025 .type = SOCK_DGRAM, 1026 .protocol = IPPROTO_ICMP, 1027 .prot = &ping_prot, 1028 .ops = &inet_dgram_ops, 1029 .no_check = UDP_CSUM_DEFAULT, 1030 .flags = INET_PROTOSW_REUSE, 1031 }, 1032 1033 { 1034 .type = SOCK_RAW, 1035 .protocol = IPPROTO_IP, /* wild card */ 1036 .prot = &raw_prot, 1037 .ops = &inet_sockraw_ops, 1038 .no_check = UDP_CSUM_DEFAULT, 1039 .flags = INET_PROTOSW_REUSE, 1040 } 1041 }; 1042 1043 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) 1044 1045 void inet_register_protosw(struct inet_protosw *p) 1046 { 1047 struct list_head *lh; 1048 struct inet_protosw *answer; 1049 int protocol = p->protocol; 1050 struct list_head *last_perm; 1051 1052 spin_lock_bh(&inetsw_lock); 1053 1054 if (p->type >= SOCK_MAX) 1055 goto out_illegal; 1056 1057 /* If we are trying to override a permanent protocol, bail. */ 1058 answer = NULL; 1059 last_perm = &inetsw[p->type]; 1060 list_for_each(lh, &inetsw[p->type]) { 1061 answer = list_entry(lh, struct inet_protosw, list); 1062 1063 /* Check only the non-wild match. */ 1064 if (INET_PROTOSW_PERMANENT & answer->flags) { 1065 if (protocol == answer->protocol) 1066 break; 1067 last_perm = lh; 1068 } 1069 1070 answer = NULL; 1071 } 1072 if (answer) 1073 goto out_permanent; 1074 1075 /* Add the new entry after the last permanent entry if any, so that 1076 * the new entry does not override a permanent entry when matched with 1077 * a wild-card protocol. But it is allowed to override any existing 1078 * non-permanent entry. This means that when we remove this entry, the 1079 * system automatically returns to the old behavior. 1080 */ 1081 list_add_rcu(&p->list, last_perm); 1082 out: 1083 spin_unlock_bh(&inetsw_lock); 1084 1085 return; 1086 1087 out_permanent: 1088 printk(KERN_ERR "Attempt to override permanent protocol %d.\n", 1089 protocol); 1090 goto out; 1091 1092 out_illegal: 1093 printk(KERN_ERR 1094 "Ignoring attempt to register invalid socket type %d.\n", 1095 p->type); 1096 goto out; 1097 } 1098 EXPORT_SYMBOL(inet_register_protosw); 1099 1100 void inet_unregister_protosw(struct inet_protosw *p) 1101 { 1102 if (INET_PROTOSW_PERMANENT & p->flags) { 1103 printk(KERN_ERR 1104 "Attempt to unregister permanent protocol %d.\n", 1105 p->protocol); 1106 } else { 1107 spin_lock_bh(&inetsw_lock); 1108 list_del_rcu(&p->list); 1109 spin_unlock_bh(&inetsw_lock); 1110 1111 synchronize_net(); 1112 } 1113 } 1114 EXPORT_SYMBOL(inet_unregister_protosw); 1115 1116 /* 1117 * Shall we try to damage output packets if routing dev changes? 1118 */ 1119 1120 int sysctl_ip_dynaddr __read_mostly; 1121 1122 static int inet_sk_reselect_saddr(struct sock *sk) 1123 { 1124 struct inet_sock *inet = inet_sk(sk); 1125 __be32 old_saddr = inet->inet_saddr; 1126 __be32 daddr = inet->inet_daddr; 1127 struct flowi4 *fl4; 1128 struct rtable *rt; 1129 __be32 new_saddr; 1130 struct ip_options_rcu *inet_opt; 1131 1132 inet_opt = rcu_dereference_protected(inet->inet_opt, 1133 sock_owned_by_user(sk)); 1134 if (inet_opt && inet_opt->opt.srr) 1135 daddr = inet_opt->opt.faddr; 1136 1137 /* Query new route. */ 1138 fl4 = &inet->cork.fl.u.ip4; 1139 rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk), 1140 sk->sk_bound_dev_if, sk->sk_protocol, 1141 inet->inet_sport, inet->inet_dport, sk, false); 1142 if (IS_ERR(rt)) 1143 return PTR_ERR(rt); 1144 1145 sk_setup_caps(sk, &rt->dst); 1146 1147 new_saddr = fl4->saddr; 1148 1149 if (new_saddr == old_saddr) 1150 return 0; 1151 1152 if (sysctl_ip_dynaddr > 1) { 1153 printk(KERN_INFO "%s(): shifting inet->saddr from %pI4 to %pI4\n", 1154 __func__, &old_saddr, &new_saddr); 1155 } 1156 1157 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr; 1158 1159 /* 1160 * XXX The only one ugly spot where we need to 1161 * XXX really change the sockets identity after 1162 * XXX it has entered the hashes. -DaveM 1163 * 1164 * Besides that, it does not check for connection 1165 * uniqueness. Wait for troubles. 1166 */ 1167 __sk_prot_rehash(sk); 1168 return 0; 1169 } 1170 1171 int inet_sk_rebuild_header(struct sock *sk) 1172 { 1173 struct inet_sock *inet = inet_sk(sk); 1174 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); 1175 __be32 daddr; 1176 struct ip_options_rcu *inet_opt; 1177 struct flowi4 *fl4; 1178 int err; 1179 1180 /* Route is OK, nothing to do. */ 1181 if (rt) 1182 return 0; 1183 1184 /* Reroute. */ 1185 rcu_read_lock(); 1186 inet_opt = rcu_dereference(inet->inet_opt); 1187 daddr = inet->inet_daddr; 1188 if (inet_opt && inet_opt->opt.srr) 1189 daddr = inet_opt->opt.faddr; 1190 rcu_read_unlock(); 1191 fl4 = &inet->cork.fl.u.ip4; 1192 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr, 1193 inet->inet_dport, inet->inet_sport, 1194 sk->sk_protocol, RT_CONN_FLAGS(sk), 1195 sk->sk_bound_dev_if); 1196 if (!IS_ERR(rt)) { 1197 err = 0; 1198 sk_setup_caps(sk, &rt->dst); 1199 } else { 1200 err = PTR_ERR(rt); 1201 1202 /* Routing failed... */ 1203 sk->sk_route_caps = 0; 1204 /* 1205 * Other protocols have to map its equivalent state to TCP_SYN_SENT. 1206 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme 1207 */ 1208 if (!sysctl_ip_dynaddr || 1209 sk->sk_state != TCP_SYN_SENT || 1210 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 1211 (err = inet_sk_reselect_saddr(sk)) != 0) 1212 sk->sk_err_soft = -err; 1213 } 1214 1215 return err; 1216 } 1217 EXPORT_SYMBOL(inet_sk_rebuild_header); 1218 1219 static int inet_gso_send_check(struct sk_buff *skb) 1220 { 1221 const struct iphdr *iph; 1222 const struct net_protocol *ops; 1223 int proto; 1224 int ihl; 1225 int err = -EINVAL; 1226 1227 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1228 goto out; 1229 1230 iph = ip_hdr(skb); 1231 ihl = iph->ihl * 4; 1232 if (ihl < sizeof(*iph)) 1233 goto out; 1234 1235 if (unlikely(!pskb_may_pull(skb, ihl))) 1236 goto out; 1237 1238 __skb_pull(skb, ihl); 1239 skb_reset_transport_header(skb); 1240 iph = ip_hdr(skb); 1241 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1242 err = -EPROTONOSUPPORT; 1243 1244 rcu_read_lock(); 1245 ops = rcu_dereference(inet_protos[proto]); 1246 if (likely(ops && ops->gso_send_check)) 1247 err = ops->gso_send_check(skb); 1248 rcu_read_unlock(); 1249 1250 out: 1251 return err; 1252 } 1253 1254 static struct sk_buff *inet_gso_segment(struct sk_buff *skb, 1255 netdev_features_t features) 1256 { 1257 struct sk_buff *segs = ERR_PTR(-EINVAL); 1258 struct iphdr *iph; 1259 const struct net_protocol *ops; 1260 int proto; 1261 int ihl; 1262 int id; 1263 unsigned int offset = 0; 1264 1265 if (!(features & NETIF_F_V4_CSUM)) 1266 features &= ~NETIF_F_SG; 1267 1268 if (unlikely(skb_shinfo(skb)->gso_type & 1269 ~(SKB_GSO_TCPV4 | 1270 SKB_GSO_UDP | 1271 SKB_GSO_DODGY | 1272 SKB_GSO_TCP_ECN | 1273 0))) 1274 goto out; 1275 1276 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1277 goto out; 1278 1279 iph = ip_hdr(skb); 1280 ihl = iph->ihl * 4; 1281 if (ihl < sizeof(*iph)) 1282 goto out; 1283 1284 if (unlikely(!pskb_may_pull(skb, ihl))) 1285 goto out; 1286 1287 __skb_pull(skb, ihl); 1288 skb_reset_transport_header(skb); 1289 iph = ip_hdr(skb); 1290 id = ntohs(iph->id); 1291 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1292 segs = ERR_PTR(-EPROTONOSUPPORT); 1293 1294 rcu_read_lock(); 1295 ops = rcu_dereference(inet_protos[proto]); 1296 if (likely(ops && ops->gso_segment)) 1297 segs = ops->gso_segment(skb, features); 1298 rcu_read_unlock(); 1299 1300 if (!segs || IS_ERR(segs)) 1301 goto out; 1302 1303 skb = segs; 1304 do { 1305 iph = ip_hdr(skb); 1306 if (proto == IPPROTO_UDP) { 1307 iph->id = htons(id); 1308 iph->frag_off = htons(offset >> 3); 1309 if (skb->next != NULL) 1310 iph->frag_off |= htons(IP_MF); 1311 offset += (skb->len - skb->mac_len - iph->ihl * 4); 1312 } else 1313 iph->id = htons(id++); 1314 iph->tot_len = htons(skb->len - skb->mac_len); 1315 iph->check = 0; 1316 iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl); 1317 } while ((skb = skb->next)); 1318 1319 out: 1320 return segs; 1321 } 1322 1323 static struct sk_buff **inet_gro_receive(struct sk_buff **head, 1324 struct sk_buff *skb) 1325 { 1326 const struct net_protocol *ops; 1327 struct sk_buff **pp = NULL; 1328 struct sk_buff *p; 1329 const struct iphdr *iph; 1330 unsigned int hlen; 1331 unsigned int off; 1332 unsigned int id; 1333 int flush = 1; 1334 int proto; 1335 1336 off = skb_gro_offset(skb); 1337 hlen = off + sizeof(*iph); 1338 iph = skb_gro_header_fast(skb, off); 1339 if (skb_gro_header_hard(skb, hlen)) { 1340 iph = skb_gro_header_slow(skb, hlen, off); 1341 if (unlikely(!iph)) 1342 goto out; 1343 } 1344 1345 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1346 1347 rcu_read_lock(); 1348 ops = rcu_dereference(inet_protos[proto]); 1349 if (!ops || !ops->gro_receive) 1350 goto out_unlock; 1351 1352 if (*(u8 *)iph != 0x45) 1353 goto out_unlock; 1354 1355 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) 1356 goto out_unlock; 1357 1358 id = ntohl(*(__be32 *)&iph->id); 1359 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id ^ IP_DF)); 1360 id >>= 16; 1361 1362 for (p = *head; p; p = p->next) { 1363 struct iphdr *iph2; 1364 1365 if (!NAPI_GRO_CB(p)->same_flow) 1366 continue; 1367 1368 iph2 = ip_hdr(p); 1369 1370 if ((iph->protocol ^ iph2->protocol) | 1371 (iph->tos ^ iph2->tos) | 1372 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) | 1373 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) { 1374 NAPI_GRO_CB(p)->same_flow = 0; 1375 continue; 1376 } 1377 1378 /* All fields must match except length and checksum. */ 1379 NAPI_GRO_CB(p)->flush |= 1380 (iph->ttl ^ iph2->ttl) | 1381 ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id); 1382 1383 NAPI_GRO_CB(p)->flush |= flush; 1384 } 1385 1386 NAPI_GRO_CB(skb)->flush |= flush; 1387 skb_gro_pull(skb, sizeof(*iph)); 1388 skb_set_transport_header(skb, skb_gro_offset(skb)); 1389 1390 pp = ops->gro_receive(head, skb); 1391 1392 out_unlock: 1393 rcu_read_unlock(); 1394 1395 out: 1396 NAPI_GRO_CB(skb)->flush |= flush; 1397 1398 return pp; 1399 } 1400 1401 static int inet_gro_complete(struct sk_buff *skb) 1402 { 1403 const struct net_protocol *ops; 1404 struct iphdr *iph = ip_hdr(skb); 1405 int proto = iph->protocol & (MAX_INET_PROTOS - 1); 1406 int err = -ENOSYS; 1407 __be16 newlen = htons(skb->len - skb_network_offset(skb)); 1408 1409 csum_replace2(&iph->check, iph->tot_len, newlen); 1410 iph->tot_len = newlen; 1411 1412 rcu_read_lock(); 1413 ops = rcu_dereference(inet_protos[proto]); 1414 if (WARN_ON(!ops || !ops->gro_complete)) 1415 goto out_unlock; 1416 1417 err = ops->gro_complete(skb); 1418 1419 out_unlock: 1420 rcu_read_unlock(); 1421 1422 return err; 1423 } 1424 1425 int inet_ctl_sock_create(struct sock **sk, unsigned short family, 1426 unsigned short type, unsigned char protocol, 1427 struct net *net) 1428 { 1429 struct socket *sock; 1430 int rc = sock_create_kern(family, type, protocol, &sock); 1431 1432 if (rc == 0) { 1433 *sk = sock->sk; 1434 (*sk)->sk_allocation = GFP_ATOMIC; 1435 /* 1436 * Unhash it so that IP input processing does not even see it, 1437 * we do not wish this socket to see incoming packets. 1438 */ 1439 (*sk)->sk_prot->unhash(*sk); 1440 1441 sk_change_net(*sk, net); 1442 } 1443 return rc; 1444 } 1445 EXPORT_SYMBOL_GPL(inet_ctl_sock_create); 1446 1447 unsigned long snmp_fold_field(void __percpu *mib[], int offt) 1448 { 1449 unsigned long res = 0; 1450 int i, j; 1451 1452 for_each_possible_cpu(i) { 1453 for (j = 0; j < SNMP_ARRAY_SZ; j++) 1454 res += *(((unsigned long *) per_cpu_ptr(mib[j], i)) + offt); 1455 } 1456 return res; 1457 } 1458 EXPORT_SYMBOL_GPL(snmp_fold_field); 1459 1460 #if BITS_PER_LONG==32 1461 1462 u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t syncp_offset) 1463 { 1464 u64 res = 0; 1465 int cpu; 1466 1467 for_each_possible_cpu(cpu) { 1468 void *bhptr; 1469 struct u64_stats_sync *syncp; 1470 u64 v; 1471 unsigned int start; 1472 1473 bhptr = per_cpu_ptr(mib[0], cpu); 1474 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset); 1475 do { 1476 start = u64_stats_fetch_begin_bh(syncp); 1477 v = *(((u64 *) bhptr) + offt); 1478 } while (u64_stats_fetch_retry_bh(syncp, start)); 1479 1480 res += v; 1481 } 1482 return res; 1483 } 1484 EXPORT_SYMBOL_GPL(snmp_fold_field64); 1485 #endif 1486 1487 int snmp_mib_init(void __percpu *ptr[2], size_t mibsize, size_t align) 1488 { 1489 BUG_ON(ptr == NULL); 1490 ptr[0] = __alloc_percpu(mibsize, align); 1491 if (!ptr[0]) 1492 return -ENOMEM; 1493 #if SNMP_ARRAY_SZ == 2 1494 ptr[1] = __alloc_percpu(mibsize, align); 1495 if (!ptr[1]) { 1496 free_percpu(ptr[0]); 1497 ptr[0] = NULL; 1498 return -ENOMEM; 1499 } 1500 #endif 1501 return 0; 1502 } 1503 EXPORT_SYMBOL_GPL(snmp_mib_init); 1504 1505 void snmp_mib_free(void __percpu *ptr[SNMP_ARRAY_SZ]) 1506 { 1507 int i; 1508 1509 BUG_ON(ptr == NULL); 1510 for (i = 0; i < SNMP_ARRAY_SZ; i++) { 1511 free_percpu(ptr[i]); 1512 ptr[i] = NULL; 1513 } 1514 } 1515 EXPORT_SYMBOL_GPL(snmp_mib_free); 1516 1517 #ifdef CONFIG_IP_MULTICAST 1518 static const struct net_protocol igmp_protocol = { 1519 .handler = igmp_rcv, 1520 .netns_ok = 1, 1521 }; 1522 #endif 1523 1524 static const struct net_protocol tcp_protocol = { 1525 .handler = tcp_v4_rcv, 1526 .err_handler = tcp_v4_err, 1527 .gso_send_check = tcp_v4_gso_send_check, 1528 .gso_segment = tcp_tso_segment, 1529 .gro_receive = tcp4_gro_receive, 1530 .gro_complete = tcp4_gro_complete, 1531 .no_policy = 1, 1532 .netns_ok = 1, 1533 }; 1534 1535 static const struct net_protocol udp_protocol = { 1536 .handler = udp_rcv, 1537 .err_handler = udp_err, 1538 .gso_send_check = udp4_ufo_send_check, 1539 .gso_segment = udp4_ufo_fragment, 1540 .no_policy = 1, 1541 .netns_ok = 1, 1542 }; 1543 1544 static const struct net_protocol icmp_protocol = { 1545 .handler = icmp_rcv, 1546 .err_handler = ping_err, 1547 .no_policy = 1, 1548 .netns_ok = 1, 1549 }; 1550 1551 static __net_init int ipv4_mib_init_net(struct net *net) 1552 { 1553 if (snmp_mib_init((void __percpu **)net->mib.tcp_statistics, 1554 sizeof(struct tcp_mib), 1555 __alignof__(struct tcp_mib)) < 0) 1556 goto err_tcp_mib; 1557 if (snmp_mib_init((void __percpu **)net->mib.ip_statistics, 1558 sizeof(struct ipstats_mib), 1559 __alignof__(struct ipstats_mib)) < 0) 1560 goto err_ip_mib; 1561 if (snmp_mib_init((void __percpu **)net->mib.net_statistics, 1562 sizeof(struct linux_mib), 1563 __alignof__(struct linux_mib)) < 0) 1564 goto err_net_mib; 1565 if (snmp_mib_init((void __percpu **)net->mib.udp_statistics, 1566 sizeof(struct udp_mib), 1567 __alignof__(struct udp_mib)) < 0) 1568 goto err_udp_mib; 1569 if (snmp_mib_init((void __percpu **)net->mib.udplite_statistics, 1570 sizeof(struct udp_mib), 1571 __alignof__(struct udp_mib)) < 0) 1572 goto err_udplite_mib; 1573 if (snmp_mib_init((void __percpu **)net->mib.icmp_statistics, 1574 sizeof(struct icmp_mib), 1575 __alignof__(struct icmp_mib)) < 0) 1576 goto err_icmp_mib; 1577 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib), 1578 GFP_KERNEL); 1579 if (!net->mib.icmpmsg_statistics) 1580 goto err_icmpmsg_mib; 1581 1582 tcp_mib_init(net); 1583 return 0; 1584 1585 err_icmpmsg_mib: 1586 snmp_mib_free((void __percpu **)net->mib.icmp_statistics); 1587 err_icmp_mib: 1588 snmp_mib_free((void __percpu **)net->mib.udplite_statistics); 1589 err_udplite_mib: 1590 snmp_mib_free((void __percpu **)net->mib.udp_statistics); 1591 err_udp_mib: 1592 snmp_mib_free((void __percpu **)net->mib.net_statistics); 1593 err_net_mib: 1594 snmp_mib_free((void __percpu **)net->mib.ip_statistics); 1595 err_ip_mib: 1596 snmp_mib_free((void __percpu **)net->mib.tcp_statistics); 1597 err_tcp_mib: 1598 return -ENOMEM; 1599 } 1600 1601 static __net_exit void ipv4_mib_exit_net(struct net *net) 1602 { 1603 kfree(net->mib.icmpmsg_statistics); 1604 snmp_mib_free((void __percpu **)net->mib.icmp_statistics); 1605 snmp_mib_free((void __percpu **)net->mib.udplite_statistics); 1606 snmp_mib_free((void __percpu **)net->mib.udp_statistics); 1607 snmp_mib_free((void __percpu **)net->mib.net_statistics); 1608 snmp_mib_free((void __percpu **)net->mib.ip_statistics); 1609 snmp_mib_free((void __percpu **)net->mib.tcp_statistics); 1610 } 1611 1612 static __net_initdata struct pernet_operations ipv4_mib_ops = { 1613 .init = ipv4_mib_init_net, 1614 .exit = ipv4_mib_exit_net, 1615 }; 1616 1617 static int __init init_ipv4_mibs(void) 1618 { 1619 return register_pernet_subsys(&ipv4_mib_ops); 1620 } 1621 1622 static int ipv4_proc_init(void); 1623 1624 /* 1625 * IP protocol layer initialiser 1626 */ 1627 1628 static struct packet_type ip_packet_type __read_mostly = { 1629 .type = cpu_to_be16(ETH_P_IP), 1630 .func = ip_rcv, 1631 .gso_send_check = inet_gso_send_check, 1632 .gso_segment = inet_gso_segment, 1633 .gro_receive = inet_gro_receive, 1634 .gro_complete = inet_gro_complete, 1635 }; 1636 1637 static int __init inet_init(void) 1638 { 1639 struct sk_buff *dummy_skb; 1640 struct inet_protosw *q; 1641 struct list_head *r; 1642 int rc = -EINVAL; 1643 1644 BUILD_BUG_ON(sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb)); 1645 1646 sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL); 1647 if (!sysctl_local_reserved_ports) 1648 goto out; 1649 1650 rc = proto_register(&tcp_prot, 1); 1651 if (rc) 1652 goto out_free_reserved_ports; 1653 1654 rc = proto_register(&udp_prot, 1); 1655 if (rc) 1656 goto out_unregister_tcp_proto; 1657 1658 rc = proto_register(&raw_prot, 1); 1659 if (rc) 1660 goto out_unregister_udp_proto; 1661 1662 rc = proto_register(&ping_prot, 1); 1663 if (rc) 1664 goto out_unregister_raw_proto; 1665 1666 /* 1667 * Tell SOCKET that we are alive... 1668 */ 1669 1670 (void)sock_register(&inet_family_ops); 1671 1672 #ifdef CONFIG_SYSCTL 1673 ip_static_sysctl_init(); 1674 #endif 1675 1676 tcp_prot.sysctl_mem = init_net.ipv4.sysctl_tcp_mem; 1677 1678 /* 1679 * Add all the base protocols. 1680 */ 1681 1682 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 1683 printk(KERN_CRIT "inet_init: Cannot add ICMP protocol\n"); 1684 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) 1685 printk(KERN_CRIT "inet_init: Cannot add UDP protocol\n"); 1686 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) 1687 printk(KERN_CRIT "inet_init: Cannot add TCP protocol\n"); 1688 #ifdef CONFIG_IP_MULTICAST 1689 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 1690 printk(KERN_CRIT "inet_init: Cannot add IGMP protocol\n"); 1691 #endif 1692 1693 /* Register the socket-side information for inet_create. */ 1694 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 1695 INIT_LIST_HEAD(r); 1696 1697 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 1698 inet_register_protosw(q); 1699 1700 /* 1701 * Set the ARP module up 1702 */ 1703 1704 arp_init(); 1705 1706 /* 1707 * Set the IP module up 1708 */ 1709 1710 ip_init(); 1711 1712 tcp_v4_init(); 1713 1714 /* Setup TCP slab cache for open requests. */ 1715 tcp_init(); 1716 1717 /* Setup UDP memory threshold */ 1718 udp_init(); 1719 1720 /* Add UDP-Lite (RFC 3828) */ 1721 udplite4_register(); 1722 1723 ping_init(); 1724 1725 /* 1726 * Set the ICMP layer up 1727 */ 1728 1729 if (icmp_init() < 0) 1730 panic("Failed to create the ICMP control socket.\n"); 1731 1732 /* 1733 * Initialise the multicast router 1734 */ 1735 #if defined(CONFIG_IP_MROUTE) 1736 if (ip_mr_init()) 1737 printk(KERN_CRIT "inet_init: Cannot init ipv4 mroute\n"); 1738 #endif 1739 /* 1740 * Initialise per-cpu ipv4 mibs 1741 */ 1742 1743 if (init_ipv4_mibs()) 1744 printk(KERN_CRIT "inet_init: Cannot init ipv4 mibs\n"); 1745 1746 ipv4_proc_init(); 1747 1748 ipfrag_init(); 1749 1750 dev_add_pack(&ip_packet_type); 1751 1752 rc = 0; 1753 out: 1754 return rc; 1755 out_unregister_raw_proto: 1756 proto_unregister(&raw_prot); 1757 out_unregister_udp_proto: 1758 proto_unregister(&udp_prot); 1759 out_unregister_tcp_proto: 1760 proto_unregister(&tcp_prot); 1761 out_free_reserved_ports: 1762 kfree(sysctl_local_reserved_ports); 1763 goto out; 1764 } 1765 1766 fs_initcall(inet_init); 1767 1768 /* ------------------------------------------------------------------------ */ 1769 1770 #ifdef CONFIG_PROC_FS 1771 static int __init ipv4_proc_init(void) 1772 { 1773 int rc = 0; 1774 1775 if (raw_proc_init()) 1776 goto out_raw; 1777 if (tcp4_proc_init()) 1778 goto out_tcp; 1779 if (udp4_proc_init()) 1780 goto out_udp; 1781 if (ping_proc_init()) 1782 goto out_ping; 1783 if (ip_misc_proc_init()) 1784 goto out_misc; 1785 out: 1786 return rc; 1787 out_misc: 1788 ping_proc_exit(); 1789 out_ping: 1790 udp4_proc_exit(); 1791 out_udp: 1792 tcp4_proc_exit(); 1793 out_tcp: 1794 raw_proc_exit(); 1795 out_raw: 1796 rc = -ENOMEM; 1797 goto out; 1798 } 1799 1800 #else /* CONFIG_PROC_FS */ 1801 static int __init ipv4_proc_init(void) 1802 { 1803 return 0; 1804 } 1805 #endif /* CONFIG_PROC_FS */ 1806 1807 MODULE_ALIAS_NETPROTO(PF_INET); 1808 1809