Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/net/ipv4/af_inet.c
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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 #define pr_fmt(fmt) "IPv4: " fmt 69 70 #include <linux/err.h> 71 #include <linux/errno.h> 72 #include <linux/types.h> 73 #include <linux/socket.h> 74 #include <linux/in.h> 75 #include <linux/kernel.h> 76 #include <linux/module.h> 77 #include <linux/sched.h> 78 #include <linux/timer.h> 79 #include <linux/string.h> 80 #include <linux/sockios.h> 81 #include <linux/net.h> 82 #include <linux/capability.h> 83 #include <linux/fcntl.h> 84 #include <linux/mm.h> 85 #include <linux/interrupt.h> 86 #include <linux/stat.h> 87 #include <linux/init.h> 88 #include <linux/poll.h> 89 #include <linux/netfilter_ipv4.h> 90 #include <linux/random.h> 91 #include <linux/slab.h> 92 93 #include <asm/uaccess.h> 94 95 #include <linux/inet.h> 96 #include <linux/igmp.h> 97 #include <linux/inetdevice.h> 98 #include <linux/netdevice.h> 99 #include <net/checksum.h> 100 #include <net/ip.h> 101 #include <net/protocol.h> 102 #include <net/arp.h> 103 #include <net/route.h> 104 #include <net/ip_fib.h> 105 #include <net/inet_connection_sock.h> 106 #include <net/tcp.h> 107 #include <net/udp.h> 108 #include <net/udplite.h> 109 #include <net/ping.h> 110 #include <linux/skbuff.h> 111 #include <net/sock.h> 112 #include <net/raw.h> 113 #include <net/icmp.h> 114 #include <net/ipip.h> 115 #include <net/inet_common.h> 116 #include <net/xfrm.h> 117 #include <net/net_namespace.h> 118 #ifdef CONFIG_IP_MROUTE 119 #include <linux/mroute.h> 120 #endif 121 122 123 /* The inetsw table contains everything that inet_create needs to 124 * build a new socket. 125 */ 126 static struct list_head inetsw[SOCK_MAX]; 127 static DEFINE_SPINLOCK(inetsw_lock); 128 129 struct ipv4_config ipv4_config; 130 EXPORT_SYMBOL(ipv4_config); 131 132 /* New destruction routine */ 133 134 void inet_sock_destruct(struct sock *sk) 135 { 136 struct inet_sock *inet = inet_sk(sk); 137 138 __skb_queue_purge(&sk->sk_receive_queue); 139 __skb_queue_purge(&sk->sk_error_queue); 140 141 sk_mem_reclaim(sk); 142 143 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) { 144 pr_err("Attempt to release TCP socket in state %d %p\n", 145 sk->sk_state, sk); 146 return; 147 } 148 if (!sock_flag(sk, SOCK_DEAD)) { 149 pr_err("Attempt to release alive inet socket %p\n", sk); 150 return; 151 } 152 153 WARN_ON(atomic_read(&sk->sk_rmem_alloc)); 154 WARN_ON(atomic_read(&sk->sk_wmem_alloc)); 155 WARN_ON(sk->sk_wmem_queued); 156 WARN_ON(sk->sk_forward_alloc); 157 158 kfree(rcu_dereference_protected(inet->inet_opt, 1)); 159 dst_release(rcu_dereference_check(sk->sk_dst_cache, 1)); 160 dst_release(sk->sk_rx_dst); 161 sk_refcnt_debug_dec(sk); 162 } 163 EXPORT_SYMBOL(inet_sock_destruct); 164 165 /* 166 * The routines beyond this point handle the behaviour of an AF_INET 167 * socket object. Mostly it punts to the subprotocols of IP to do 168 * the work. 169 */ 170 171 /* 172 * Automatically bind an unbound socket. 173 */ 174 175 static int inet_autobind(struct sock *sk) 176 { 177 struct inet_sock *inet; 178 /* We may need to bind the socket. */ 179 lock_sock(sk); 180 inet = inet_sk(sk); 181 if (!inet->inet_num) { 182 if (sk->sk_prot->get_port(sk, 0)) { 183 release_sock(sk); 184 return -EAGAIN; 185 } 186 inet->inet_sport = htons(inet->inet_num); 187 } 188 release_sock(sk); 189 return 0; 190 } 191 192 /* 193 * Move a socket into listening state. 194 */ 195 int inet_listen(struct socket *sock, int backlog) 196 { 197 struct sock *sk = sock->sk; 198 unsigned char old_state; 199 int err; 200 201 lock_sock(sk); 202 203 err = -EINVAL; 204 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM) 205 goto out; 206 207 old_state = sk->sk_state; 208 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN))) 209 goto out; 210 211 /* Really, if the socket is already in listen state 212 * we can only allow the backlog to be adjusted. 213 */ 214 if (old_state != TCP_LISTEN) { 215 /* Check special setups for testing purpose to enable TFO w/o 216 * requiring TCP_FASTOPEN sockopt. 217 * Note that only TCP sockets (SOCK_STREAM) will reach here. 218 * Also fastopenq may already been allocated because this 219 * socket was in TCP_LISTEN state previously but was 220 * shutdown() (rather than close()). 221 */ 222 if ((sysctl_tcp_fastopen & TFO_SERVER_ENABLE) != 0 && 223 inet_csk(sk)->icsk_accept_queue.fastopenq == NULL) { 224 if ((sysctl_tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) != 0) 225 err = fastopen_init_queue(sk, backlog); 226 else if ((sysctl_tcp_fastopen & 227 TFO_SERVER_WO_SOCKOPT2) != 0) 228 err = fastopen_init_queue(sk, 229 ((uint)sysctl_tcp_fastopen) >> 16); 230 else 231 err = 0; 232 if (err) 233 goto out; 234 } 235 err = inet_csk_listen_start(sk, backlog); 236 if (err) 237 goto out; 238 } 239 sk->sk_max_ack_backlog = backlog; 240 err = 0; 241 242 out: 243 release_sock(sk); 244 return err; 245 } 246 EXPORT_SYMBOL(inet_listen); 247 248 u32 inet_ehash_secret __read_mostly; 249 EXPORT_SYMBOL(inet_ehash_secret); 250 251 /* 252 * inet_ehash_secret must be set exactly once 253 */ 254 void build_ehash_secret(void) 255 { 256 u32 rnd; 257 258 do { 259 get_random_bytes(&rnd, sizeof(rnd)); 260 } while (rnd == 0); 261 262 cmpxchg(&inet_ehash_secret, 0, rnd); 263 } 264 EXPORT_SYMBOL(build_ehash_secret); 265 266 static inline int inet_netns_ok(struct net *net, __u8 protocol) 267 { 268 const struct net_protocol *ipprot; 269 270 if (net_eq(net, &init_net)) 271 return 1; 272 273 ipprot = rcu_dereference(inet_protos[protocol]); 274 if (ipprot == NULL) { 275 /* raw IP is OK */ 276 return 1; 277 } 278 return ipprot->netns_ok; 279 } 280 281 /* 282 * Create an inet socket. 283 */ 284 285 static int inet_create(struct net *net, struct socket *sock, int protocol, 286 int kern) 287 { 288 struct sock *sk; 289 struct inet_protosw *answer; 290 struct inet_sock *inet; 291 struct proto *answer_prot; 292 unsigned char answer_flags; 293 char answer_no_check; 294 int try_loading_module = 0; 295 int err; 296 297 if (unlikely(!inet_ehash_secret)) 298 if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM) 299 build_ehash_secret(); 300 301 sock->state = SS_UNCONNECTED; 302 303 /* Look for the requested type/protocol pair. */ 304 lookup_protocol: 305 err = -ESOCKTNOSUPPORT; 306 rcu_read_lock(); 307 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) { 308 309 err = 0; 310 /* Check the non-wild match. */ 311 if (protocol == answer->protocol) { 312 if (protocol != IPPROTO_IP) 313 break; 314 } else { 315 /* Check for the two wild cases. */ 316 if (IPPROTO_IP == protocol) { 317 protocol = answer->protocol; 318 break; 319 } 320 if (IPPROTO_IP == answer->protocol) 321 break; 322 } 323 err = -EPROTONOSUPPORT; 324 } 325 326 if (unlikely(err)) { 327 if (try_loading_module < 2) { 328 rcu_read_unlock(); 329 /* 330 * Be more specific, e.g. net-pf-2-proto-132-type-1 331 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) 332 */ 333 if (++try_loading_module == 1) 334 request_module("net-pf-%d-proto-%d-type-%d", 335 PF_INET, protocol, sock->type); 336 /* 337 * Fall back to generic, e.g. net-pf-2-proto-132 338 * (net-pf-PF_INET-proto-IPPROTO_SCTP) 339 */ 340 else 341 request_module("net-pf-%d-proto-%d", 342 PF_INET, protocol); 343 goto lookup_protocol; 344 } else 345 goto out_rcu_unlock; 346 } 347 348 err = -EPERM; 349 if (sock->type == SOCK_RAW && !kern && 350 !ns_capable(net->user_ns, CAP_NET_RAW)) 351 goto out_rcu_unlock; 352 353 err = -EAFNOSUPPORT; 354 if (!inet_netns_ok(net, protocol)) 355 goto out_rcu_unlock; 356 357 sock->ops = answer->ops; 358 answer_prot = answer->prot; 359 answer_no_check = answer->no_check; 360 answer_flags = answer->flags; 361 rcu_read_unlock(); 362 363 WARN_ON(answer_prot->slab == NULL); 364 365 err = -ENOBUFS; 366 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot); 367 if (sk == NULL) 368 goto out; 369 370 err = 0; 371 sk->sk_no_check = answer_no_check; 372 if (INET_PROTOSW_REUSE & answer_flags) 373 sk->sk_reuse = SK_CAN_REUSE; 374 375 inet = inet_sk(sk); 376 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 377 378 inet->nodefrag = 0; 379 380 if (SOCK_RAW == sock->type) { 381 inet->inet_num = protocol; 382 if (IPPROTO_RAW == protocol) 383 inet->hdrincl = 1; 384 } 385 386 if (ipv4_config.no_pmtu_disc) 387 inet->pmtudisc = IP_PMTUDISC_DONT; 388 else 389 inet->pmtudisc = IP_PMTUDISC_WANT; 390 391 inet->inet_id = 0; 392 393 sock_init_data(sock, sk); 394 395 sk->sk_destruct = inet_sock_destruct; 396 sk->sk_protocol = protocol; 397 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 398 399 inet->uc_ttl = -1; 400 inet->mc_loop = 1; 401 inet->mc_ttl = 1; 402 inet->mc_all = 1; 403 inet->mc_index = 0; 404 inet->mc_list = NULL; 405 inet->rcv_tos = 0; 406 407 sk_refcnt_debug_inc(sk); 408 409 if (inet->inet_num) { 410 /* It assumes that any protocol which allows 411 * the user to assign a number at socket 412 * creation time automatically 413 * shares. 414 */ 415 inet->inet_sport = htons(inet->inet_num); 416 /* Add to protocol hash chains. */ 417 sk->sk_prot->hash(sk); 418 } 419 420 if (sk->sk_prot->init) { 421 err = sk->sk_prot->init(sk); 422 if (err) 423 sk_common_release(sk); 424 } 425 out: 426 return err; 427 out_rcu_unlock: 428 rcu_read_unlock(); 429 goto out; 430 } 431 432 433 /* 434 * The peer socket should always be NULL (or else). When we call this 435 * function we are destroying the object and from then on nobody 436 * should refer to it. 437 */ 438 int inet_release(struct socket *sock) 439 { 440 struct sock *sk = sock->sk; 441 442 if (sk) { 443 long timeout; 444 445 sock_rps_reset_flow(sk); 446 447 /* Applications forget to leave groups before exiting */ 448 ip_mc_drop_socket(sk); 449 450 /* If linger is set, we don't return until the close 451 * is complete. Otherwise we return immediately. The 452 * actually closing is done the same either way. 453 * 454 * If the close is due to the process exiting, we never 455 * linger.. 456 */ 457 timeout = 0; 458 if (sock_flag(sk, SOCK_LINGER) && 459 !(current->flags & PF_EXITING)) 460 timeout = sk->sk_lingertime; 461 sock->sk = NULL; 462 sk->sk_prot->close(sk, timeout); 463 } 464 return 0; 465 } 466 EXPORT_SYMBOL(inet_release); 467 468 /* It is off by default, see below. */ 469 int sysctl_ip_nonlocal_bind __read_mostly; 470 EXPORT_SYMBOL(sysctl_ip_nonlocal_bind); 471 472 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 473 { 474 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 475 struct sock *sk = sock->sk; 476 struct inet_sock *inet = inet_sk(sk); 477 struct net *net = sock_net(sk); 478 unsigned short snum; 479 int chk_addr_ret; 480 int err; 481 482 /* If the socket has its own bind function then use it. (RAW) */ 483 if (sk->sk_prot->bind) { 484 err = sk->sk_prot->bind(sk, uaddr, addr_len); 485 goto out; 486 } 487 err = -EINVAL; 488 if (addr_len < sizeof(struct sockaddr_in)) 489 goto out; 490 491 if (addr->sin_family != AF_INET) { 492 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET) 493 * only if s_addr is INADDR_ANY. 494 */ 495 err = -EAFNOSUPPORT; 496 if (addr->sin_family != AF_UNSPEC || 497 addr->sin_addr.s_addr != htonl(INADDR_ANY)) 498 goto out; 499 } 500 501 chk_addr_ret = inet_addr_type(net, addr->sin_addr.s_addr); 502 503 /* Not specified by any standard per-se, however it breaks too 504 * many applications when removed. It is unfortunate since 505 * allowing applications to make a non-local bind solves 506 * several problems with systems using dynamic addressing. 507 * (ie. your servers still start up even if your ISDN link 508 * is temporarily down) 509 */ 510 err = -EADDRNOTAVAIL; 511 if (!sysctl_ip_nonlocal_bind && 512 !(inet->freebind || inet->transparent) && 513 addr->sin_addr.s_addr != htonl(INADDR_ANY) && 514 chk_addr_ret != RTN_LOCAL && 515 chk_addr_ret != RTN_MULTICAST && 516 chk_addr_ret != RTN_BROADCAST) 517 goto out; 518 519 snum = ntohs(addr->sin_port); 520 err = -EACCES; 521 if (snum && snum < PROT_SOCK && 522 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 523 goto out; 524 525 /* We keep a pair of addresses. rcv_saddr is the one 526 * used by hash lookups, and saddr is used for transmit. 527 * 528 * In the BSD API these are the same except where it 529 * would be illegal to use them (multicast/broadcast) in 530 * which case the sending device address is used. 531 */ 532 lock_sock(sk); 533 534 /* Check these errors (active socket, double bind). */ 535 err = -EINVAL; 536 if (sk->sk_state != TCP_CLOSE || inet->inet_num) 537 goto out_release_sock; 538 539 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 540 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 541 inet->inet_saddr = 0; /* Use device */ 542 543 /* Make sure we are allowed to bind here. */ 544 if (sk->sk_prot->get_port(sk, snum)) { 545 inet->inet_saddr = inet->inet_rcv_saddr = 0; 546 err = -EADDRINUSE; 547 goto out_release_sock; 548 } 549 550 if (inet->inet_rcv_saddr) 551 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 552 if (snum) 553 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 554 inet->inet_sport = htons(inet->inet_num); 555 inet->inet_daddr = 0; 556 inet->inet_dport = 0; 557 sk_dst_reset(sk); 558 err = 0; 559 out_release_sock: 560 release_sock(sk); 561 out: 562 return err; 563 } 564 EXPORT_SYMBOL(inet_bind); 565 566 int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr, 567 int addr_len, int flags) 568 { 569 struct sock *sk = sock->sk; 570 571 if (addr_len < sizeof(uaddr->sa_family)) 572 return -EINVAL; 573 if (uaddr->sa_family == AF_UNSPEC) 574 return sk->sk_prot->disconnect(sk, flags); 575 576 if (!inet_sk(sk)->inet_num && inet_autobind(sk)) 577 return -EAGAIN; 578 return sk->sk_prot->connect(sk, uaddr, addr_len); 579 } 580 EXPORT_SYMBOL(inet_dgram_connect); 581 582 static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias) 583 { 584 DEFINE_WAIT(wait); 585 586 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 587 sk->sk_write_pending += writebias; 588 589 /* Basic assumption: if someone sets sk->sk_err, he _must_ 590 * change state of the socket from TCP_SYN_*. 591 * Connect() does not allow to get error notifications 592 * without closing the socket. 593 */ 594 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 595 release_sock(sk); 596 timeo = schedule_timeout(timeo); 597 lock_sock(sk); 598 if (signal_pending(current) || !timeo) 599 break; 600 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 601 } 602 finish_wait(sk_sleep(sk), &wait); 603 sk->sk_write_pending -= writebias; 604 return timeo; 605 } 606 607 /* 608 * Connect to a remote host. There is regrettably still a little 609 * TCP 'magic' in here. 610 */ 611 int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 612 int addr_len, int flags) 613 { 614 struct sock *sk = sock->sk; 615 int err; 616 long timeo; 617 618 if (addr_len < sizeof(uaddr->sa_family)) 619 return -EINVAL; 620 621 if (uaddr->sa_family == AF_UNSPEC) { 622 err = sk->sk_prot->disconnect(sk, flags); 623 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 624 goto out; 625 } 626 627 switch (sock->state) { 628 default: 629 err = -EINVAL; 630 goto out; 631 case SS_CONNECTED: 632 err = -EISCONN; 633 goto out; 634 case SS_CONNECTING: 635 err = -EALREADY; 636 /* Fall out of switch with err, set for this state */ 637 break; 638 case SS_UNCONNECTED: 639 err = -EISCONN; 640 if (sk->sk_state != TCP_CLOSE) 641 goto out; 642 643 err = sk->sk_prot->connect(sk, uaddr, addr_len); 644 if (err < 0) 645 goto out; 646 647 sock->state = SS_CONNECTING; 648 649 /* Just entered SS_CONNECTING state; the only 650 * difference is that return value in non-blocking 651 * case is EINPROGRESS, rather than EALREADY. 652 */ 653 err = -EINPROGRESS; 654 break; 655 } 656 657 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 658 659 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 660 int writebias = (sk->sk_protocol == IPPROTO_TCP) && 661 tcp_sk(sk)->fastopen_req && 662 tcp_sk(sk)->fastopen_req->data ? 1 : 0; 663 664 /* Error code is set above */ 665 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias)) 666 goto out; 667 668 err = sock_intr_errno(timeo); 669 if (signal_pending(current)) 670 goto out; 671 } 672 673 /* Connection was closed by RST, timeout, ICMP error 674 * or another process disconnected us. 675 */ 676 if (sk->sk_state == TCP_CLOSE) 677 goto sock_error; 678 679 /* sk->sk_err may be not zero now, if RECVERR was ordered by user 680 * and error was received after socket entered established state. 681 * Hence, it is handled normally after connect() return successfully. 682 */ 683 684 sock->state = SS_CONNECTED; 685 err = 0; 686 out: 687 return err; 688 689 sock_error: 690 err = sock_error(sk) ? : -ECONNABORTED; 691 sock->state = SS_UNCONNECTED; 692 if (sk->sk_prot->disconnect(sk, flags)) 693 sock->state = SS_DISCONNECTING; 694 goto out; 695 } 696 EXPORT_SYMBOL(__inet_stream_connect); 697 698 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 699 int addr_len, int flags) 700 { 701 int err; 702 703 lock_sock(sock->sk); 704 err = __inet_stream_connect(sock, uaddr, addr_len, flags); 705 release_sock(sock->sk); 706 return err; 707 } 708 EXPORT_SYMBOL(inet_stream_connect); 709 710 /* 711 * Accept a pending connection. The TCP layer now gives BSD semantics. 712 */ 713 714 int inet_accept(struct socket *sock, struct socket *newsock, int flags) 715 { 716 struct sock *sk1 = sock->sk; 717 int err = -EINVAL; 718 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err); 719 720 if (!sk2) 721 goto do_err; 722 723 lock_sock(sk2); 724 725 sock_rps_record_flow(sk2); 726 WARN_ON(!((1 << sk2->sk_state) & 727 (TCPF_ESTABLISHED | TCPF_SYN_RECV | 728 TCPF_CLOSE_WAIT | TCPF_CLOSE))); 729 730 sock_graft(sk2, newsock); 731 732 newsock->state = SS_CONNECTED; 733 err = 0; 734 release_sock(sk2); 735 do_err: 736 return err; 737 } 738 EXPORT_SYMBOL(inet_accept); 739 740 741 /* 742 * This does both peername and sockname. 743 */ 744 int inet_getname(struct socket *sock, struct sockaddr *uaddr, 745 int *uaddr_len, int peer) 746 { 747 struct sock *sk = sock->sk; 748 struct inet_sock *inet = inet_sk(sk); 749 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr); 750 751 sin->sin_family = AF_INET; 752 if (peer) { 753 if (!inet->inet_dport || 754 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 755 peer == 1)) 756 return -ENOTCONN; 757 sin->sin_port = inet->inet_dport; 758 sin->sin_addr.s_addr = inet->inet_daddr; 759 } else { 760 __be32 addr = inet->inet_rcv_saddr; 761 if (!addr) 762 addr = inet->inet_saddr; 763 sin->sin_port = inet->inet_sport; 764 sin->sin_addr.s_addr = addr; 765 } 766 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 767 *uaddr_len = sizeof(*sin); 768 return 0; 769 } 770 EXPORT_SYMBOL(inet_getname); 771 772 int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 773 size_t size) 774 { 775 struct sock *sk = sock->sk; 776 777 sock_rps_record_flow(sk); 778 779 /* We may need to bind the socket. */ 780 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 781 inet_autobind(sk)) 782 return -EAGAIN; 783 784 return sk->sk_prot->sendmsg(iocb, sk, msg, size); 785 } 786 EXPORT_SYMBOL(inet_sendmsg); 787 788 ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, 789 size_t size, int flags) 790 { 791 struct sock *sk = sock->sk; 792 793 sock_rps_record_flow(sk); 794 795 /* We may need to bind the socket. */ 796 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 797 inet_autobind(sk)) 798 return -EAGAIN; 799 800 if (sk->sk_prot->sendpage) 801 return sk->sk_prot->sendpage(sk, page, offset, size, flags); 802 return sock_no_sendpage(sock, page, offset, size, flags); 803 } 804 EXPORT_SYMBOL(inet_sendpage); 805 806 int inet_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 807 size_t size, int flags) 808 { 809 struct sock *sk = sock->sk; 810 int addr_len = 0; 811 int err; 812 813 sock_rps_record_flow(sk); 814 815 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, 816 flags & ~MSG_DONTWAIT, &addr_len); 817 if (err >= 0) 818 msg->msg_namelen = addr_len; 819 return err; 820 } 821 EXPORT_SYMBOL(inet_recvmsg); 822 823 int inet_shutdown(struct socket *sock, int how) 824 { 825 struct sock *sk = sock->sk; 826 int err = 0; 827 828 /* This should really check to make sure 829 * the socket is a TCP socket. (WHY AC...) 830 */ 831 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and 832 1->2 bit 2 snds. 833 2->3 */ 834 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ 835 return -EINVAL; 836 837 lock_sock(sk); 838 if (sock->state == SS_CONNECTING) { 839 if ((1 << sk->sk_state) & 840 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) 841 sock->state = SS_DISCONNECTING; 842 else 843 sock->state = SS_CONNECTED; 844 } 845 846 switch (sk->sk_state) { 847 case TCP_CLOSE: 848 err = -ENOTCONN; 849 /* Hack to wake up other listeners, who can poll for 850 POLLHUP, even on eg. unconnected UDP sockets -- RR */ 851 default: 852 sk->sk_shutdown |= how; 853 if (sk->sk_prot->shutdown) 854 sk->sk_prot->shutdown(sk, how); 855 break; 856 857 /* Remaining two branches are temporary solution for missing 858 * close() in multithreaded environment. It is _not_ a good idea, 859 * but we have no choice until close() is repaired at VFS level. 860 */ 861 case TCP_LISTEN: 862 if (!(how & RCV_SHUTDOWN)) 863 break; 864 /* Fall through */ 865 case TCP_SYN_SENT: 866 err = sk->sk_prot->disconnect(sk, O_NONBLOCK); 867 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 868 break; 869 } 870 871 /* Wake up anyone sleeping in poll. */ 872 sk->sk_state_change(sk); 873 release_sock(sk); 874 return err; 875 } 876 EXPORT_SYMBOL(inet_shutdown); 877 878 /* 879 * ioctl() calls you can issue on an INET socket. Most of these are 880 * device configuration and stuff and very rarely used. Some ioctls 881 * pass on to the socket itself. 882 * 883 * NOTE: I like the idea of a module for the config stuff. ie ifconfig 884 * loads the devconfigure module does its configuring and unloads it. 885 * There's a good 20K of config code hanging around the kernel. 886 */ 887 888 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 889 { 890 struct sock *sk = sock->sk; 891 int err = 0; 892 struct net *net = sock_net(sk); 893 894 switch (cmd) { 895 case SIOCGSTAMP: 896 err = sock_get_timestamp(sk, (struct timeval __user *)arg); 897 break; 898 case SIOCGSTAMPNS: 899 err = sock_get_timestampns(sk, (struct timespec __user *)arg); 900 break; 901 case SIOCADDRT: 902 case SIOCDELRT: 903 case SIOCRTMSG: 904 err = ip_rt_ioctl(net, cmd, (void __user *)arg); 905 break; 906 case SIOCDARP: 907 case SIOCGARP: 908 case SIOCSARP: 909 err = arp_ioctl(net, cmd, (void __user *)arg); 910 break; 911 case SIOCGIFADDR: 912 case SIOCSIFADDR: 913 case SIOCGIFBRDADDR: 914 case SIOCSIFBRDADDR: 915 case SIOCGIFNETMASK: 916 case SIOCSIFNETMASK: 917 case SIOCGIFDSTADDR: 918 case SIOCSIFDSTADDR: 919 case SIOCSIFPFLAGS: 920 case SIOCGIFPFLAGS: 921 case SIOCSIFFLAGS: 922 err = devinet_ioctl(net, cmd, (void __user *)arg); 923 break; 924 default: 925 if (sk->sk_prot->ioctl) 926 err = sk->sk_prot->ioctl(sk, cmd, arg); 927 else 928 err = -ENOIOCTLCMD; 929 break; 930 } 931 return err; 932 } 933 EXPORT_SYMBOL(inet_ioctl); 934 935 #ifdef CONFIG_COMPAT 936 static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 937 { 938 struct sock *sk = sock->sk; 939 int err = -ENOIOCTLCMD; 940 941 if (sk->sk_prot->compat_ioctl) 942 err = sk->sk_prot->compat_ioctl(sk, cmd, arg); 943 944 return err; 945 } 946 #endif 947 948 const struct proto_ops inet_stream_ops = { 949 .family = PF_INET, 950 .owner = THIS_MODULE, 951 .release = inet_release, 952 .bind = inet_bind, 953 .connect = inet_stream_connect, 954 .socketpair = sock_no_socketpair, 955 .accept = inet_accept, 956 .getname = inet_getname, 957 .poll = tcp_poll, 958 .ioctl = inet_ioctl, 959 .listen = inet_listen, 960 .shutdown = inet_shutdown, 961 .setsockopt = sock_common_setsockopt, 962 .getsockopt = sock_common_getsockopt, 963 .sendmsg = inet_sendmsg, 964 .recvmsg = inet_recvmsg, 965 .mmap = sock_no_mmap, 966 .sendpage = inet_sendpage, 967 .splice_read = tcp_splice_read, 968 #ifdef CONFIG_COMPAT 969 .compat_setsockopt = compat_sock_common_setsockopt, 970 .compat_getsockopt = compat_sock_common_getsockopt, 971 .compat_ioctl = inet_compat_ioctl, 972 #endif 973 }; 974 EXPORT_SYMBOL(inet_stream_ops); 975 976 const struct proto_ops inet_dgram_ops = { 977 .family = PF_INET, 978 .owner = THIS_MODULE, 979 .release = inet_release, 980 .bind = inet_bind, 981 .connect = inet_dgram_connect, 982 .socketpair = sock_no_socketpair, 983 .accept = sock_no_accept, 984 .getname = inet_getname, 985 .poll = udp_poll, 986 .ioctl = inet_ioctl, 987 .listen = sock_no_listen, 988 .shutdown = inet_shutdown, 989 .setsockopt = sock_common_setsockopt, 990 .getsockopt = sock_common_getsockopt, 991 .sendmsg = inet_sendmsg, 992 .recvmsg = inet_recvmsg, 993 .mmap = sock_no_mmap, 994 .sendpage = inet_sendpage, 995 #ifdef CONFIG_COMPAT 996 .compat_setsockopt = compat_sock_common_setsockopt, 997 .compat_getsockopt = compat_sock_common_getsockopt, 998 .compat_ioctl = inet_compat_ioctl, 999 #endif 1000 }; 1001 EXPORT_SYMBOL(inet_dgram_ops); 1002 1003 /* 1004 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 1005 * udp_poll 1006 */ 1007 static const struct proto_ops inet_sockraw_ops = { 1008 .family = PF_INET, 1009 .owner = THIS_MODULE, 1010 .release = inet_release, 1011 .bind = inet_bind, 1012 .connect = inet_dgram_connect, 1013 .socketpair = sock_no_socketpair, 1014 .accept = sock_no_accept, 1015 .getname = inet_getname, 1016 .poll = datagram_poll, 1017 .ioctl = inet_ioctl, 1018 .listen = sock_no_listen, 1019 .shutdown = inet_shutdown, 1020 .setsockopt = sock_common_setsockopt, 1021 .getsockopt = sock_common_getsockopt, 1022 .sendmsg = inet_sendmsg, 1023 .recvmsg = inet_recvmsg, 1024 .mmap = sock_no_mmap, 1025 .sendpage = inet_sendpage, 1026 #ifdef CONFIG_COMPAT 1027 .compat_setsockopt = compat_sock_common_setsockopt, 1028 .compat_getsockopt = compat_sock_common_getsockopt, 1029 .compat_ioctl = inet_compat_ioctl, 1030 #endif 1031 }; 1032 1033 static const struct net_proto_family inet_family_ops = { 1034 .family = PF_INET, 1035 .create = inet_create, 1036 .owner = THIS_MODULE, 1037 }; 1038 1039 /* Upon startup we insert all the elements in inetsw_array[] into 1040 * the linked list inetsw. 1041 */ 1042 static struct inet_protosw inetsw_array[] = 1043 { 1044 { 1045 .type = SOCK_STREAM, 1046 .protocol = IPPROTO_TCP, 1047 .prot = &tcp_prot, 1048 .ops = &inet_stream_ops, 1049 .no_check = 0, 1050 .flags = INET_PROTOSW_PERMANENT | 1051 INET_PROTOSW_ICSK, 1052 }, 1053 1054 { 1055 .type = SOCK_DGRAM, 1056 .protocol = IPPROTO_UDP, 1057 .prot = &udp_prot, 1058 .ops = &inet_dgram_ops, 1059 .no_check = UDP_CSUM_DEFAULT, 1060 .flags = INET_PROTOSW_PERMANENT, 1061 }, 1062 1063 { 1064 .type = SOCK_DGRAM, 1065 .protocol = IPPROTO_ICMP, 1066 .prot = &ping_prot, 1067 .ops = &inet_dgram_ops, 1068 .no_check = UDP_CSUM_DEFAULT, 1069 .flags = INET_PROTOSW_REUSE, 1070 }, 1071 1072 { 1073 .type = SOCK_RAW, 1074 .protocol = IPPROTO_IP, /* wild card */ 1075 .prot = &raw_prot, 1076 .ops = &inet_sockraw_ops, 1077 .no_check = UDP_CSUM_DEFAULT, 1078 .flags = INET_PROTOSW_REUSE, 1079 } 1080 }; 1081 1082 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) 1083 1084 void inet_register_protosw(struct inet_protosw *p) 1085 { 1086 struct list_head *lh; 1087 struct inet_protosw *answer; 1088 int protocol = p->protocol; 1089 struct list_head *last_perm; 1090 1091 spin_lock_bh(&inetsw_lock); 1092 1093 if (p->type >= SOCK_MAX) 1094 goto out_illegal; 1095 1096 /* If we are trying to override a permanent protocol, bail. */ 1097 answer = NULL; 1098 last_perm = &inetsw[p->type]; 1099 list_for_each(lh, &inetsw[p->type]) { 1100 answer = list_entry(lh, struct inet_protosw, list); 1101 1102 /* Check only the non-wild match. */ 1103 if (INET_PROTOSW_PERMANENT & answer->flags) { 1104 if (protocol == answer->protocol) 1105 break; 1106 last_perm = lh; 1107 } 1108 1109 answer = NULL; 1110 } 1111 if (answer) 1112 goto out_permanent; 1113 1114 /* Add the new entry after the last permanent entry if any, so that 1115 * the new entry does not override a permanent entry when matched with 1116 * a wild-card protocol. But it is allowed to override any existing 1117 * non-permanent entry. This means that when we remove this entry, the 1118 * system automatically returns to the old behavior. 1119 */ 1120 list_add_rcu(&p->list, last_perm); 1121 out: 1122 spin_unlock_bh(&inetsw_lock); 1123 1124 return; 1125 1126 out_permanent: 1127 pr_err("Attempt to override permanent protocol %d\n", protocol); 1128 goto out; 1129 1130 out_illegal: 1131 pr_err("Ignoring attempt to register invalid socket type %d\n", 1132 p->type); 1133 goto out; 1134 } 1135 EXPORT_SYMBOL(inet_register_protosw); 1136 1137 void inet_unregister_protosw(struct inet_protosw *p) 1138 { 1139 if (INET_PROTOSW_PERMANENT & p->flags) { 1140 pr_err("Attempt to unregister permanent protocol %d\n", 1141 p->protocol); 1142 } else { 1143 spin_lock_bh(&inetsw_lock); 1144 list_del_rcu(&p->list); 1145 spin_unlock_bh(&inetsw_lock); 1146 1147 synchronize_net(); 1148 } 1149 } 1150 EXPORT_SYMBOL(inet_unregister_protosw); 1151 1152 /* 1153 * Shall we try to damage output packets if routing dev changes? 1154 */ 1155 1156 int sysctl_ip_dynaddr __read_mostly; 1157 1158 static int inet_sk_reselect_saddr(struct sock *sk) 1159 { 1160 struct inet_sock *inet = inet_sk(sk); 1161 __be32 old_saddr = inet->inet_saddr; 1162 __be32 daddr = inet->inet_daddr; 1163 struct flowi4 *fl4; 1164 struct rtable *rt; 1165 __be32 new_saddr; 1166 struct ip_options_rcu *inet_opt; 1167 1168 inet_opt = rcu_dereference_protected(inet->inet_opt, 1169 sock_owned_by_user(sk)); 1170 if (inet_opt && inet_opt->opt.srr) 1171 daddr = inet_opt->opt.faddr; 1172 1173 /* Query new route. */ 1174 fl4 = &inet->cork.fl.u.ip4; 1175 rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk), 1176 sk->sk_bound_dev_if, sk->sk_protocol, 1177 inet->inet_sport, inet->inet_dport, sk, false); 1178 if (IS_ERR(rt)) 1179 return PTR_ERR(rt); 1180 1181 sk_setup_caps(sk, &rt->dst); 1182 1183 new_saddr = fl4->saddr; 1184 1185 if (new_saddr == old_saddr) 1186 return 0; 1187 1188 if (sysctl_ip_dynaddr > 1) { 1189 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n", 1190 __func__, &old_saddr, &new_saddr); 1191 } 1192 1193 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr; 1194 1195 /* 1196 * XXX The only one ugly spot where we need to 1197 * XXX really change the sockets identity after 1198 * XXX it has entered the hashes. -DaveM 1199 * 1200 * Besides that, it does not check for connection 1201 * uniqueness. Wait for troubles. 1202 */ 1203 __sk_prot_rehash(sk); 1204 return 0; 1205 } 1206 1207 int inet_sk_rebuild_header(struct sock *sk) 1208 { 1209 struct inet_sock *inet = inet_sk(sk); 1210 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); 1211 __be32 daddr; 1212 struct ip_options_rcu *inet_opt; 1213 struct flowi4 *fl4; 1214 int err; 1215 1216 /* Route is OK, nothing to do. */ 1217 if (rt) 1218 return 0; 1219 1220 /* Reroute. */ 1221 rcu_read_lock(); 1222 inet_opt = rcu_dereference(inet->inet_opt); 1223 daddr = inet->inet_daddr; 1224 if (inet_opt && inet_opt->opt.srr) 1225 daddr = inet_opt->opt.faddr; 1226 rcu_read_unlock(); 1227 fl4 = &inet->cork.fl.u.ip4; 1228 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr, 1229 inet->inet_dport, inet->inet_sport, 1230 sk->sk_protocol, RT_CONN_FLAGS(sk), 1231 sk->sk_bound_dev_if); 1232 if (!IS_ERR(rt)) { 1233 err = 0; 1234 sk_setup_caps(sk, &rt->dst); 1235 } else { 1236 err = PTR_ERR(rt); 1237 1238 /* Routing failed... */ 1239 sk->sk_route_caps = 0; 1240 /* 1241 * Other protocols have to map its equivalent state to TCP_SYN_SENT. 1242 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme 1243 */ 1244 if (!sysctl_ip_dynaddr || 1245 sk->sk_state != TCP_SYN_SENT || 1246 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 1247 (err = inet_sk_reselect_saddr(sk)) != 0) 1248 sk->sk_err_soft = -err; 1249 } 1250 1251 return err; 1252 } 1253 EXPORT_SYMBOL(inet_sk_rebuild_header); 1254 1255 static int inet_gso_send_check(struct sk_buff *skb) 1256 { 1257 const struct net_offload *ops; 1258 const struct iphdr *iph; 1259 int proto; 1260 int ihl; 1261 int err = -EINVAL; 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 proto = iph->protocol; 1278 err = -EPROTONOSUPPORT; 1279 1280 rcu_read_lock(); 1281 ops = rcu_dereference(inet_offloads[proto]); 1282 if (likely(ops && ops->callbacks.gso_send_check)) 1283 err = ops->callbacks.gso_send_check(skb); 1284 rcu_read_unlock(); 1285 1286 out: 1287 return err; 1288 } 1289 1290 static struct sk_buff *inet_gso_segment(struct sk_buff *skb, 1291 netdev_features_t features) 1292 { 1293 struct sk_buff *segs = ERR_PTR(-EINVAL); 1294 const struct net_offload *ops; 1295 struct iphdr *iph; 1296 int proto; 1297 int ihl; 1298 int id; 1299 unsigned int offset = 0; 1300 1301 if (!(features & NETIF_F_V4_CSUM)) 1302 features &= ~NETIF_F_SG; 1303 1304 if (unlikely(skb_shinfo(skb)->gso_type & 1305 ~(SKB_GSO_TCPV4 | 1306 SKB_GSO_UDP | 1307 SKB_GSO_DODGY | 1308 SKB_GSO_TCP_ECN | 1309 0))) 1310 goto out; 1311 1312 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1313 goto out; 1314 1315 iph = ip_hdr(skb); 1316 ihl = iph->ihl * 4; 1317 if (ihl < sizeof(*iph)) 1318 goto out; 1319 1320 if (unlikely(!pskb_may_pull(skb, ihl))) 1321 goto out; 1322 1323 __skb_pull(skb, ihl); 1324 skb_reset_transport_header(skb); 1325 iph = ip_hdr(skb); 1326 id = ntohs(iph->id); 1327 proto = iph->protocol; 1328 segs = ERR_PTR(-EPROTONOSUPPORT); 1329 1330 rcu_read_lock(); 1331 ops = rcu_dereference(inet_offloads[proto]); 1332 if (likely(ops && ops->callbacks.gso_segment)) 1333 segs = ops->callbacks.gso_segment(skb, features); 1334 rcu_read_unlock(); 1335 1336 if (!segs || IS_ERR(segs)) 1337 goto out; 1338 1339 skb = segs; 1340 do { 1341 iph = ip_hdr(skb); 1342 if (proto == IPPROTO_UDP) { 1343 iph->id = htons(id); 1344 iph->frag_off = htons(offset >> 3); 1345 if (skb->next != NULL) 1346 iph->frag_off |= htons(IP_MF); 1347 offset += (skb->len - skb->mac_len - iph->ihl * 4); 1348 } else 1349 iph->id = htons(id++); 1350 iph->tot_len = htons(skb->len - skb->mac_len); 1351 iph->check = 0; 1352 iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl); 1353 } while ((skb = skb->next)); 1354 1355 out: 1356 return segs; 1357 } 1358 1359 static struct sk_buff **inet_gro_receive(struct sk_buff **head, 1360 struct sk_buff *skb) 1361 { 1362 const struct net_offload *ops; 1363 struct sk_buff **pp = NULL; 1364 struct sk_buff *p; 1365 const struct iphdr *iph; 1366 unsigned int hlen; 1367 unsigned int off; 1368 unsigned int id; 1369 int flush = 1; 1370 int proto; 1371 1372 off = skb_gro_offset(skb); 1373 hlen = off + sizeof(*iph); 1374 iph = skb_gro_header_fast(skb, off); 1375 if (skb_gro_header_hard(skb, hlen)) { 1376 iph = skb_gro_header_slow(skb, hlen, off); 1377 if (unlikely(!iph)) 1378 goto out; 1379 } 1380 1381 proto = iph->protocol; 1382 1383 rcu_read_lock(); 1384 ops = rcu_dereference(inet_offloads[proto]); 1385 if (!ops || !ops->callbacks.gro_receive) 1386 goto out_unlock; 1387 1388 if (*(u8 *)iph != 0x45) 1389 goto out_unlock; 1390 1391 if (unlikely(ip_fast_csum((u8 *)iph, 5))) 1392 goto out_unlock; 1393 1394 id = ntohl(*(__be32 *)&iph->id); 1395 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id ^ IP_DF)); 1396 id >>= 16; 1397 1398 for (p = *head; p; p = p->next) { 1399 struct iphdr *iph2; 1400 1401 if (!NAPI_GRO_CB(p)->same_flow) 1402 continue; 1403 1404 iph2 = ip_hdr(p); 1405 1406 if ((iph->protocol ^ iph2->protocol) | 1407 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) | 1408 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) { 1409 NAPI_GRO_CB(p)->same_flow = 0; 1410 continue; 1411 } 1412 1413 /* All fields must match except length and checksum. */ 1414 NAPI_GRO_CB(p)->flush |= 1415 (iph->ttl ^ iph2->ttl) | 1416 (iph->tos ^ iph2->tos) | 1417 ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id); 1418 1419 NAPI_GRO_CB(p)->flush |= flush; 1420 } 1421 1422 NAPI_GRO_CB(skb)->flush |= flush; 1423 skb_gro_pull(skb, sizeof(*iph)); 1424 skb_set_transport_header(skb, skb_gro_offset(skb)); 1425 1426 pp = ops->callbacks.gro_receive(head, skb); 1427 1428 out_unlock: 1429 rcu_read_unlock(); 1430 1431 out: 1432 NAPI_GRO_CB(skb)->flush |= flush; 1433 1434 return pp; 1435 } 1436 1437 static int inet_gro_complete(struct sk_buff *skb) 1438 { 1439 __be16 newlen = htons(skb->len - skb_network_offset(skb)); 1440 struct iphdr *iph = ip_hdr(skb); 1441 const struct net_offload *ops; 1442 int proto = iph->protocol; 1443 int err = -ENOSYS; 1444 1445 csum_replace2(&iph->check, iph->tot_len, newlen); 1446 iph->tot_len = newlen; 1447 1448 rcu_read_lock(); 1449 ops = rcu_dereference(inet_offloads[proto]); 1450 if (WARN_ON(!ops || !ops->callbacks.gro_complete)) 1451 goto out_unlock; 1452 1453 err = ops->callbacks.gro_complete(skb); 1454 1455 out_unlock: 1456 rcu_read_unlock(); 1457 1458 return err; 1459 } 1460 1461 int inet_ctl_sock_create(struct sock **sk, unsigned short family, 1462 unsigned short type, unsigned char protocol, 1463 struct net *net) 1464 { 1465 struct socket *sock; 1466 int rc = sock_create_kern(family, type, protocol, &sock); 1467 1468 if (rc == 0) { 1469 *sk = sock->sk; 1470 (*sk)->sk_allocation = GFP_ATOMIC; 1471 /* 1472 * Unhash it so that IP input processing does not even see it, 1473 * we do not wish this socket to see incoming packets. 1474 */ 1475 (*sk)->sk_prot->unhash(*sk); 1476 1477 sk_change_net(*sk, net); 1478 } 1479 return rc; 1480 } 1481 EXPORT_SYMBOL_GPL(inet_ctl_sock_create); 1482 1483 unsigned long snmp_fold_field(void __percpu *mib[], int offt) 1484 { 1485 unsigned long res = 0; 1486 int i, j; 1487 1488 for_each_possible_cpu(i) { 1489 for (j = 0; j < SNMP_ARRAY_SZ; j++) 1490 res += *(((unsigned long *) per_cpu_ptr(mib[j], i)) + offt); 1491 } 1492 return res; 1493 } 1494 EXPORT_SYMBOL_GPL(snmp_fold_field); 1495 1496 #if BITS_PER_LONG==32 1497 1498 u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t syncp_offset) 1499 { 1500 u64 res = 0; 1501 int cpu; 1502 1503 for_each_possible_cpu(cpu) { 1504 void *bhptr; 1505 struct u64_stats_sync *syncp; 1506 u64 v; 1507 unsigned int start; 1508 1509 bhptr = per_cpu_ptr(mib[0], cpu); 1510 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset); 1511 do { 1512 start = u64_stats_fetch_begin_bh(syncp); 1513 v = *(((u64 *) bhptr) + offt); 1514 } while (u64_stats_fetch_retry_bh(syncp, start)); 1515 1516 res += v; 1517 } 1518 return res; 1519 } 1520 EXPORT_SYMBOL_GPL(snmp_fold_field64); 1521 #endif 1522 1523 int snmp_mib_init(void __percpu *ptr[2], size_t mibsize, size_t align) 1524 { 1525 BUG_ON(ptr == NULL); 1526 ptr[0] = __alloc_percpu(mibsize, align); 1527 if (!ptr[0]) 1528 return -ENOMEM; 1529 #if SNMP_ARRAY_SZ == 2 1530 ptr[1] = __alloc_percpu(mibsize, align); 1531 if (!ptr[1]) { 1532 free_percpu(ptr[0]); 1533 ptr[0] = NULL; 1534 return -ENOMEM; 1535 } 1536 #endif 1537 return 0; 1538 } 1539 EXPORT_SYMBOL_GPL(snmp_mib_init); 1540 1541 void snmp_mib_free(void __percpu *ptr[SNMP_ARRAY_SZ]) 1542 { 1543 int i; 1544 1545 BUG_ON(ptr == NULL); 1546 for (i = 0; i < SNMP_ARRAY_SZ; i++) { 1547 free_percpu(ptr[i]); 1548 ptr[i] = NULL; 1549 } 1550 } 1551 EXPORT_SYMBOL_GPL(snmp_mib_free); 1552 1553 #ifdef CONFIG_IP_MULTICAST 1554 static const struct net_protocol igmp_protocol = { 1555 .handler = igmp_rcv, 1556 .netns_ok = 1, 1557 }; 1558 #endif 1559 1560 static const struct net_protocol tcp_protocol = { 1561 .early_demux = tcp_v4_early_demux, 1562 .handler = tcp_v4_rcv, 1563 .err_handler = tcp_v4_err, 1564 .no_policy = 1, 1565 .netns_ok = 1, 1566 }; 1567 1568 static const struct net_offload tcp_offload = { 1569 .callbacks = { 1570 .gso_send_check = tcp_v4_gso_send_check, 1571 .gso_segment = tcp_tso_segment, 1572 .gro_receive = tcp4_gro_receive, 1573 .gro_complete = tcp4_gro_complete, 1574 }, 1575 }; 1576 1577 static const struct net_protocol udp_protocol = { 1578 .handler = udp_rcv, 1579 .err_handler = udp_err, 1580 .no_policy = 1, 1581 .netns_ok = 1, 1582 }; 1583 1584 static const struct net_offload udp_offload = { 1585 .callbacks = { 1586 .gso_send_check = udp4_ufo_send_check, 1587 .gso_segment = udp4_ufo_fragment, 1588 }, 1589 }; 1590 1591 static const struct net_protocol icmp_protocol = { 1592 .handler = icmp_rcv, 1593 .err_handler = ping_err, 1594 .no_policy = 1, 1595 .netns_ok = 1, 1596 }; 1597 1598 static __net_init int ipv4_mib_init_net(struct net *net) 1599 { 1600 if (snmp_mib_init((void __percpu **)net->mib.tcp_statistics, 1601 sizeof(struct tcp_mib), 1602 __alignof__(struct tcp_mib)) < 0) 1603 goto err_tcp_mib; 1604 if (snmp_mib_init((void __percpu **)net->mib.ip_statistics, 1605 sizeof(struct ipstats_mib), 1606 __alignof__(struct ipstats_mib)) < 0) 1607 goto err_ip_mib; 1608 if (snmp_mib_init((void __percpu **)net->mib.net_statistics, 1609 sizeof(struct linux_mib), 1610 __alignof__(struct linux_mib)) < 0) 1611 goto err_net_mib; 1612 if (snmp_mib_init((void __percpu **)net->mib.udp_statistics, 1613 sizeof(struct udp_mib), 1614 __alignof__(struct udp_mib)) < 0) 1615 goto err_udp_mib; 1616 if (snmp_mib_init((void __percpu **)net->mib.udplite_statistics, 1617 sizeof(struct udp_mib), 1618 __alignof__(struct udp_mib)) < 0) 1619 goto err_udplite_mib; 1620 if (snmp_mib_init((void __percpu **)net->mib.icmp_statistics, 1621 sizeof(struct icmp_mib), 1622 __alignof__(struct icmp_mib)) < 0) 1623 goto err_icmp_mib; 1624 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib), 1625 GFP_KERNEL); 1626 if (!net->mib.icmpmsg_statistics) 1627 goto err_icmpmsg_mib; 1628 1629 tcp_mib_init(net); 1630 return 0; 1631 1632 err_icmpmsg_mib: 1633 snmp_mib_free((void __percpu **)net->mib.icmp_statistics); 1634 err_icmp_mib: 1635 snmp_mib_free((void __percpu **)net->mib.udplite_statistics); 1636 err_udplite_mib: 1637 snmp_mib_free((void __percpu **)net->mib.udp_statistics); 1638 err_udp_mib: 1639 snmp_mib_free((void __percpu **)net->mib.net_statistics); 1640 err_net_mib: 1641 snmp_mib_free((void __percpu **)net->mib.ip_statistics); 1642 err_ip_mib: 1643 snmp_mib_free((void __percpu **)net->mib.tcp_statistics); 1644 err_tcp_mib: 1645 return -ENOMEM; 1646 } 1647 1648 static __net_exit void ipv4_mib_exit_net(struct net *net) 1649 { 1650 kfree(net->mib.icmpmsg_statistics); 1651 snmp_mib_free((void __percpu **)net->mib.icmp_statistics); 1652 snmp_mib_free((void __percpu **)net->mib.udplite_statistics); 1653 snmp_mib_free((void __percpu **)net->mib.udp_statistics); 1654 snmp_mib_free((void __percpu **)net->mib.net_statistics); 1655 snmp_mib_free((void __percpu **)net->mib.ip_statistics); 1656 snmp_mib_free((void __percpu **)net->mib.tcp_statistics); 1657 } 1658 1659 static __net_initdata struct pernet_operations ipv4_mib_ops = { 1660 .init = ipv4_mib_init_net, 1661 .exit = ipv4_mib_exit_net, 1662 }; 1663 1664 static int __init init_ipv4_mibs(void) 1665 { 1666 return register_pernet_subsys(&ipv4_mib_ops); 1667 } 1668 1669 static int ipv4_proc_init(void); 1670 1671 /* 1672 * IP protocol layer initialiser 1673 */ 1674 1675 static struct packet_offload ip_packet_offload __read_mostly = { 1676 .type = cpu_to_be16(ETH_P_IP), 1677 .callbacks = { 1678 .gso_send_check = inet_gso_send_check, 1679 .gso_segment = inet_gso_segment, 1680 .gro_receive = inet_gro_receive, 1681 .gro_complete = inet_gro_complete, 1682 }, 1683 }; 1684 1685 static int __init ipv4_offload_init(void) 1686 { 1687 /* 1688 * Add offloads 1689 */ 1690 if (inet_add_offload(&udp_offload, IPPROTO_UDP) < 0) 1691 pr_crit("%s: Cannot add UDP protocol offload\n", __func__); 1692 if (inet_add_offload(&tcp_offload, IPPROTO_TCP) < 0) 1693 pr_crit("%s: Cannot add TCP protocol offlaod\n", __func__); 1694 1695 dev_add_offload(&ip_packet_offload); 1696 return 0; 1697 } 1698 1699 fs_initcall(ipv4_offload_init); 1700 1701 static struct packet_type ip_packet_type __read_mostly = { 1702 .type = cpu_to_be16(ETH_P_IP), 1703 .func = ip_rcv, 1704 }; 1705 1706 static int __init inet_init(void) 1707 { 1708 struct sk_buff *dummy_skb; 1709 struct inet_protosw *q; 1710 struct list_head *r; 1711 int rc = -EINVAL; 1712 1713 BUILD_BUG_ON(sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb)); 1714 1715 sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL); 1716 if (!sysctl_local_reserved_ports) 1717 goto out; 1718 1719 rc = proto_register(&tcp_prot, 1); 1720 if (rc) 1721 goto out_free_reserved_ports; 1722 1723 rc = proto_register(&udp_prot, 1); 1724 if (rc) 1725 goto out_unregister_tcp_proto; 1726 1727 rc = proto_register(&raw_prot, 1); 1728 if (rc) 1729 goto out_unregister_udp_proto; 1730 1731 rc = proto_register(&ping_prot, 1); 1732 if (rc) 1733 goto out_unregister_raw_proto; 1734 1735 /* 1736 * Tell SOCKET that we are alive... 1737 */ 1738 1739 (void)sock_register(&inet_family_ops); 1740 1741 #ifdef CONFIG_SYSCTL 1742 ip_static_sysctl_init(); 1743 #endif 1744 1745 tcp_prot.sysctl_mem = init_net.ipv4.sysctl_tcp_mem; 1746 1747 /* 1748 * Add all the base protocols. 1749 */ 1750 1751 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 1752 pr_crit("%s: Cannot add ICMP protocol\n", __func__); 1753 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) 1754 pr_crit("%s: Cannot add UDP protocol\n", __func__); 1755 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) 1756 pr_crit("%s: Cannot add TCP protocol\n", __func__); 1757 #ifdef CONFIG_IP_MULTICAST 1758 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 1759 pr_crit("%s: Cannot add IGMP protocol\n", __func__); 1760 #endif 1761 1762 /* Register the socket-side information for inet_create. */ 1763 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 1764 INIT_LIST_HEAD(r); 1765 1766 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 1767 inet_register_protosw(q); 1768 1769 /* 1770 * Set the ARP module up 1771 */ 1772 1773 arp_init(); 1774 1775 /* 1776 * Set the IP module up 1777 */ 1778 1779 ip_init(); 1780 1781 tcp_v4_init(); 1782 1783 /* Setup TCP slab cache for open requests. */ 1784 tcp_init(); 1785 1786 /* Setup UDP memory threshold */ 1787 udp_init(); 1788 1789 /* Add UDP-Lite (RFC 3828) */ 1790 udplite4_register(); 1791 1792 ping_init(); 1793 1794 /* 1795 * Set the ICMP layer up 1796 */ 1797 1798 if (icmp_init() < 0) 1799 panic("Failed to create the ICMP control socket.\n"); 1800 1801 /* 1802 * Initialise the multicast router 1803 */ 1804 #if defined(CONFIG_IP_MROUTE) 1805 if (ip_mr_init()) 1806 pr_crit("%s: Cannot init ipv4 mroute\n", __func__); 1807 #endif 1808 /* 1809 * Initialise per-cpu ipv4 mibs 1810 */ 1811 1812 if (init_ipv4_mibs()) 1813 pr_crit("%s: Cannot init ipv4 mibs\n", __func__); 1814 1815 ipv4_proc_init(); 1816 1817 ipfrag_init(); 1818 1819 dev_add_pack(&ip_packet_type); 1820 1821 rc = 0; 1822 out: 1823 return rc; 1824 out_unregister_raw_proto: 1825 proto_unregister(&raw_prot); 1826 out_unregister_udp_proto: 1827 proto_unregister(&udp_prot); 1828 out_unregister_tcp_proto: 1829 proto_unregister(&tcp_prot); 1830 out_free_reserved_ports: 1831 kfree(sysctl_local_reserved_ports); 1832 goto out; 1833 } 1834 1835 fs_initcall(inet_init); 1836 1837 /* ------------------------------------------------------------------------ */ 1838 1839 #ifdef CONFIG_PROC_FS 1840 static int __init ipv4_proc_init(void) 1841 { 1842 int rc = 0; 1843 1844 if (raw_proc_init()) 1845 goto out_raw; 1846 if (tcp4_proc_init()) 1847 goto out_tcp; 1848 if (udp4_proc_init()) 1849 goto out_udp; 1850 if (ping_proc_init()) 1851 goto out_ping; 1852 if (ip_misc_proc_init()) 1853 goto out_misc; 1854 out: 1855 return rc; 1856 out_misc: 1857 ping_proc_exit(); 1858 out_ping: 1859 udp4_proc_exit(); 1860 out_udp: 1861 tcp4_proc_exit(); 1862 out_tcp: 1863 raw_proc_exit(); 1864 out_raw: 1865 rc = -ENOMEM; 1866 goto out; 1867 } 1868 1869 #else /* CONFIG_PROC_FS */ 1870 static int __init ipv4_proc_init(void) 1871 { 1872 return 0; 1873 } 1874 #endif /* CONFIG_PROC_FS */ 1875 1876 MODULE_ALIAS_NETPROTO(PF_INET); 1877
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