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 u32 ipv6_hash_secret __read_mostly; 252 EXPORT_SYMBOL(ipv6_hash_secret); 253 254 /* 255 * inet_ehash_secret must be set exactly once, and to a non nul value 256 * ipv6_hash_secret must be set exactly once. 257 */ 258 void build_ehash_secret(void) 259 { 260 u32 rnd; 261 262 do { 263 get_random_bytes(&rnd, sizeof(rnd)); 264 } while (rnd == 0); 265 266 if (cmpxchg(&inet_ehash_secret, 0, rnd) == 0) 267 get_random_bytes(&ipv6_hash_secret, sizeof(ipv6_hash_secret)); 268 } 269 EXPORT_SYMBOL(build_ehash_secret); 270 271 /* 272 * Create an inet socket. 273 */ 274 275 static int inet_create(struct net *net, struct socket *sock, int protocol, 276 int kern) 277 { 278 struct sock *sk; 279 struct inet_protosw *answer; 280 struct inet_sock *inet; 281 struct proto *answer_prot; 282 unsigned char answer_flags; 283 char answer_no_check; 284 int try_loading_module = 0; 285 int err; 286 287 if (unlikely(!inet_ehash_secret)) 288 if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM) 289 build_ehash_secret(); 290 291 sock->state = SS_UNCONNECTED; 292 293 /* Look for the requested type/protocol pair. */ 294 lookup_protocol: 295 err = -ESOCKTNOSUPPORT; 296 rcu_read_lock(); 297 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) { 298 299 err = 0; 300 /* Check the non-wild match. */ 301 if (protocol == answer->protocol) { 302 if (protocol != IPPROTO_IP) 303 break; 304 } else { 305 /* Check for the two wild cases. */ 306 if (IPPROTO_IP == protocol) { 307 protocol = answer->protocol; 308 break; 309 } 310 if (IPPROTO_IP == answer->protocol) 311 break; 312 } 313 err = -EPROTONOSUPPORT; 314 } 315 316 if (unlikely(err)) { 317 if (try_loading_module < 2) { 318 rcu_read_unlock(); 319 /* 320 * Be more specific, e.g. net-pf-2-proto-132-type-1 321 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) 322 */ 323 if (++try_loading_module == 1) 324 request_module("net-pf-%d-proto-%d-type-%d", 325 PF_INET, protocol, sock->type); 326 /* 327 * Fall back to generic, e.g. net-pf-2-proto-132 328 * (net-pf-PF_INET-proto-IPPROTO_SCTP) 329 */ 330 else 331 request_module("net-pf-%d-proto-%d", 332 PF_INET, protocol); 333 goto lookup_protocol; 334 } else 335 goto out_rcu_unlock; 336 } 337 338 err = -EPERM; 339 if (sock->type == SOCK_RAW && !kern && 340 !ns_capable(net->user_ns, CAP_NET_RAW)) 341 goto out_rcu_unlock; 342 343 sock->ops = answer->ops; 344 answer_prot = answer->prot; 345 answer_no_check = answer->no_check; 346 answer_flags = answer->flags; 347 rcu_read_unlock(); 348 349 WARN_ON(answer_prot->slab == NULL); 350 351 err = -ENOBUFS; 352 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot); 353 if (sk == NULL) 354 goto out; 355 356 err = 0; 357 sk->sk_no_check = answer_no_check; 358 if (INET_PROTOSW_REUSE & answer_flags) 359 sk->sk_reuse = SK_CAN_REUSE; 360 361 inet = inet_sk(sk); 362 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 363 364 inet->nodefrag = 0; 365 366 if (SOCK_RAW == sock->type) { 367 inet->inet_num = protocol; 368 if (IPPROTO_RAW == protocol) 369 inet->hdrincl = 1; 370 } 371 372 if (ipv4_config.no_pmtu_disc) 373 inet->pmtudisc = IP_PMTUDISC_DONT; 374 else 375 inet->pmtudisc = IP_PMTUDISC_WANT; 376 377 inet->inet_id = 0; 378 379 sock_init_data(sock, sk); 380 381 sk->sk_destruct = inet_sock_destruct; 382 sk->sk_protocol = protocol; 383 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 384 385 inet->uc_ttl = -1; 386 inet->mc_loop = 1; 387 inet->mc_ttl = 1; 388 inet->mc_all = 1; 389 inet->mc_index = 0; 390 inet->mc_list = NULL; 391 inet->rcv_tos = 0; 392 393 sk_refcnt_debug_inc(sk); 394 395 if (inet->inet_num) { 396 /* It assumes that any protocol which allows 397 * the user to assign a number at socket 398 * creation time automatically 399 * shares. 400 */ 401 inet->inet_sport = htons(inet->inet_num); 402 /* Add to protocol hash chains. */ 403 sk->sk_prot->hash(sk); 404 } 405 406 if (sk->sk_prot->init) { 407 err = sk->sk_prot->init(sk); 408 if (err) 409 sk_common_release(sk); 410 } 411 out: 412 return err; 413 out_rcu_unlock: 414 rcu_read_unlock(); 415 goto out; 416 } 417 418 419 /* 420 * The peer socket should always be NULL (or else). When we call this 421 * function we are destroying the object and from then on nobody 422 * should refer to it. 423 */ 424 int inet_release(struct socket *sock) 425 { 426 struct sock *sk = sock->sk; 427 428 if (sk) { 429 long timeout; 430 431 sock_rps_reset_flow(sk); 432 433 /* Applications forget to leave groups before exiting */ 434 ip_mc_drop_socket(sk); 435 436 /* If linger is set, we don't return until the close 437 * is complete. Otherwise we return immediately. The 438 * actually closing is done the same either way. 439 * 440 * If the close is due to the process exiting, we never 441 * linger.. 442 */ 443 timeout = 0; 444 if (sock_flag(sk, SOCK_LINGER) && 445 !(current->flags & PF_EXITING)) 446 timeout = sk->sk_lingertime; 447 sock->sk = NULL; 448 sk->sk_prot->close(sk, timeout); 449 } 450 return 0; 451 } 452 EXPORT_SYMBOL(inet_release); 453 454 /* It is off by default, see below. */ 455 int sysctl_ip_nonlocal_bind __read_mostly; 456 EXPORT_SYMBOL(sysctl_ip_nonlocal_bind); 457 458 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 459 { 460 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 461 struct sock *sk = sock->sk; 462 struct inet_sock *inet = inet_sk(sk); 463 struct net *net = sock_net(sk); 464 unsigned short snum; 465 int chk_addr_ret; 466 int err; 467 468 /* If the socket has its own bind function then use it. (RAW) */ 469 if (sk->sk_prot->bind) { 470 err = sk->sk_prot->bind(sk, uaddr, addr_len); 471 goto out; 472 } 473 err = -EINVAL; 474 if (addr_len < sizeof(struct sockaddr_in)) 475 goto out; 476 477 if (addr->sin_family != AF_INET) { 478 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET) 479 * only if s_addr is INADDR_ANY. 480 */ 481 err = -EAFNOSUPPORT; 482 if (addr->sin_family != AF_UNSPEC || 483 addr->sin_addr.s_addr != htonl(INADDR_ANY)) 484 goto out; 485 } 486 487 chk_addr_ret = inet_addr_type(net, addr->sin_addr.s_addr); 488 489 /* Not specified by any standard per-se, however it breaks too 490 * many applications when removed. It is unfortunate since 491 * allowing applications to make a non-local bind solves 492 * several problems with systems using dynamic addressing. 493 * (ie. your servers still start up even if your ISDN link 494 * is temporarily down) 495 */ 496 err = -EADDRNOTAVAIL; 497 if (!sysctl_ip_nonlocal_bind && 498 !(inet->freebind || inet->transparent) && 499 addr->sin_addr.s_addr != htonl(INADDR_ANY) && 500 chk_addr_ret != RTN_LOCAL && 501 chk_addr_ret != RTN_MULTICAST && 502 chk_addr_ret != RTN_BROADCAST) 503 goto out; 504 505 snum = ntohs(addr->sin_port); 506 err = -EACCES; 507 if (snum && snum < PROT_SOCK && 508 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 509 goto out; 510 511 /* We keep a pair of addresses. rcv_saddr is the one 512 * used by hash lookups, and saddr is used for transmit. 513 * 514 * In the BSD API these are the same except where it 515 * would be illegal to use them (multicast/broadcast) in 516 * which case the sending device address is used. 517 */ 518 lock_sock(sk); 519 520 /* Check these errors (active socket, double bind). */ 521 err = -EINVAL; 522 if (sk->sk_state != TCP_CLOSE || inet->inet_num) 523 goto out_release_sock; 524 525 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 526 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 527 inet->inet_saddr = 0; /* Use device */ 528 529 /* Make sure we are allowed to bind here. */ 530 if (sk->sk_prot->get_port(sk, snum)) { 531 inet->inet_saddr = inet->inet_rcv_saddr = 0; 532 err = -EADDRINUSE; 533 goto out_release_sock; 534 } 535 536 if (inet->inet_rcv_saddr) 537 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 538 if (snum) 539 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 540 inet->inet_sport = htons(inet->inet_num); 541 inet->inet_daddr = 0; 542 inet->inet_dport = 0; 543 sk_dst_reset(sk); 544 err = 0; 545 out_release_sock: 546 release_sock(sk); 547 out: 548 return err; 549 } 550 EXPORT_SYMBOL(inet_bind); 551 552 int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr, 553 int addr_len, int flags) 554 { 555 struct sock *sk = sock->sk; 556 557 if (addr_len < sizeof(uaddr->sa_family)) 558 return -EINVAL; 559 if (uaddr->sa_family == AF_UNSPEC) 560 return sk->sk_prot->disconnect(sk, flags); 561 562 if (!inet_sk(sk)->inet_num && inet_autobind(sk)) 563 return -EAGAIN; 564 return sk->sk_prot->connect(sk, uaddr, addr_len); 565 } 566 EXPORT_SYMBOL(inet_dgram_connect); 567 568 static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias) 569 { 570 DEFINE_WAIT(wait); 571 572 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 573 sk->sk_write_pending += writebias; 574 575 /* Basic assumption: if someone sets sk->sk_err, he _must_ 576 * change state of the socket from TCP_SYN_*. 577 * Connect() does not allow to get error notifications 578 * without closing the socket. 579 */ 580 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 581 release_sock(sk); 582 timeo = schedule_timeout(timeo); 583 lock_sock(sk); 584 if (signal_pending(current) || !timeo) 585 break; 586 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 587 } 588 finish_wait(sk_sleep(sk), &wait); 589 sk->sk_write_pending -= writebias; 590 return timeo; 591 } 592 593 /* 594 * Connect to a remote host. There is regrettably still a little 595 * TCP 'magic' in here. 596 */ 597 int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 598 int addr_len, int flags) 599 { 600 struct sock *sk = sock->sk; 601 int err; 602 long timeo; 603 604 if (addr_len < sizeof(uaddr->sa_family)) 605 return -EINVAL; 606 607 if (uaddr->sa_family == AF_UNSPEC) { 608 err = sk->sk_prot->disconnect(sk, flags); 609 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 610 goto out; 611 } 612 613 switch (sock->state) { 614 default: 615 err = -EINVAL; 616 goto out; 617 case SS_CONNECTED: 618 err = -EISCONN; 619 goto out; 620 case SS_CONNECTING: 621 err = -EALREADY; 622 /* Fall out of switch with err, set for this state */ 623 break; 624 case SS_UNCONNECTED: 625 err = -EISCONN; 626 if (sk->sk_state != TCP_CLOSE) 627 goto out; 628 629 err = sk->sk_prot->connect(sk, uaddr, addr_len); 630 if (err < 0) 631 goto out; 632 633 sock->state = SS_CONNECTING; 634 635 /* Just entered SS_CONNECTING state; the only 636 * difference is that return value in non-blocking 637 * case is EINPROGRESS, rather than EALREADY. 638 */ 639 err = -EINPROGRESS; 640 break; 641 } 642 643 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 644 645 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 646 int writebias = (sk->sk_protocol == IPPROTO_TCP) && 647 tcp_sk(sk)->fastopen_req && 648 tcp_sk(sk)->fastopen_req->data ? 1 : 0; 649 650 /* Error code is set above */ 651 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias)) 652 goto out; 653 654 err = sock_intr_errno(timeo); 655 if (signal_pending(current)) 656 goto out; 657 } 658 659 /* Connection was closed by RST, timeout, ICMP error 660 * or another process disconnected us. 661 */ 662 if (sk->sk_state == TCP_CLOSE) 663 goto sock_error; 664 665 /* sk->sk_err may be not zero now, if RECVERR was ordered by user 666 * and error was received after socket entered established state. 667 * Hence, it is handled normally after connect() return successfully. 668 */ 669 670 sock->state = SS_CONNECTED; 671 err = 0; 672 out: 673 return err; 674 675 sock_error: 676 err = sock_error(sk) ? : -ECONNABORTED; 677 sock->state = SS_UNCONNECTED; 678 if (sk->sk_prot->disconnect(sk, flags)) 679 sock->state = SS_DISCONNECTING; 680 goto out; 681 } 682 EXPORT_SYMBOL(__inet_stream_connect); 683 684 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 685 int addr_len, int flags) 686 { 687 int err; 688 689 lock_sock(sock->sk); 690 err = __inet_stream_connect(sock, uaddr, addr_len, flags); 691 release_sock(sock->sk); 692 return err; 693 } 694 EXPORT_SYMBOL(inet_stream_connect); 695 696 /* 697 * Accept a pending connection. The TCP layer now gives BSD semantics. 698 */ 699 700 int inet_accept(struct socket *sock, struct socket *newsock, int flags) 701 { 702 struct sock *sk1 = sock->sk; 703 int err = -EINVAL; 704 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err); 705 706 if (!sk2) 707 goto do_err; 708 709 lock_sock(sk2); 710 711 sock_rps_record_flow(sk2); 712 WARN_ON(!((1 << sk2->sk_state) & 713 (TCPF_ESTABLISHED | TCPF_SYN_RECV | 714 TCPF_CLOSE_WAIT | TCPF_CLOSE))); 715 716 sock_graft(sk2, newsock); 717 718 newsock->state = SS_CONNECTED; 719 err = 0; 720 release_sock(sk2); 721 do_err: 722 return err; 723 } 724 EXPORT_SYMBOL(inet_accept); 725 726 727 /* 728 * This does both peername and sockname. 729 */ 730 int inet_getname(struct socket *sock, struct sockaddr *uaddr, 731 int *uaddr_len, int peer) 732 { 733 struct sock *sk = sock->sk; 734 struct inet_sock *inet = inet_sk(sk); 735 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr); 736 737 sin->sin_family = AF_INET; 738 if (peer) { 739 if (!inet->inet_dport || 740 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 741 peer == 1)) 742 return -ENOTCONN; 743 sin->sin_port = inet->inet_dport; 744 sin->sin_addr.s_addr = inet->inet_daddr; 745 } else { 746 __be32 addr = inet->inet_rcv_saddr; 747 if (!addr) 748 addr = inet->inet_saddr; 749 sin->sin_port = inet->inet_sport; 750 sin->sin_addr.s_addr = addr; 751 } 752 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 753 *uaddr_len = sizeof(*sin); 754 return 0; 755 } 756 EXPORT_SYMBOL(inet_getname); 757 758 int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 759 size_t size) 760 { 761 struct sock *sk = sock->sk; 762 763 sock_rps_record_flow(sk); 764 765 /* We may need to bind the socket. */ 766 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 767 inet_autobind(sk)) 768 return -EAGAIN; 769 770 return sk->sk_prot->sendmsg(iocb, sk, msg, size); 771 } 772 EXPORT_SYMBOL(inet_sendmsg); 773 774 ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, 775 size_t size, int flags) 776 { 777 struct sock *sk = sock->sk; 778 779 sock_rps_record_flow(sk); 780 781 /* We may need to bind the socket. */ 782 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 783 inet_autobind(sk)) 784 return -EAGAIN; 785 786 if (sk->sk_prot->sendpage) 787 return sk->sk_prot->sendpage(sk, page, offset, size, flags); 788 return sock_no_sendpage(sock, page, offset, size, flags); 789 } 790 EXPORT_SYMBOL(inet_sendpage); 791 792 int inet_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 793 size_t size, int flags) 794 { 795 struct sock *sk = sock->sk; 796 int addr_len = 0; 797 int err; 798 799 sock_rps_record_flow(sk); 800 801 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, 802 flags & ~MSG_DONTWAIT, &addr_len); 803 if (err >= 0) 804 msg->msg_namelen = addr_len; 805 return err; 806 } 807 EXPORT_SYMBOL(inet_recvmsg); 808 809 int inet_shutdown(struct socket *sock, int how) 810 { 811 struct sock *sk = sock->sk; 812 int err = 0; 813 814 /* This should really check to make sure 815 * the socket is a TCP socket. (WHY AC...) 816 */ 817 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and 818 1->2 bit 2 snds. 819 2->3 */ 820 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ 821 return -EINVAL; 822 823 lock_sock(sk); 824 if (sock->state == SS_CONNECTING) { 825 if ((1 << sk->sk_state) & 826 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) 827 sock->state = SS_DISCONNECTING; 828 else 829 sock->state = SS_CONNECTED; 830 } 831 832 switch (sk->sk_state) { 833 case TCP_CLOSE: 834 err = -ENOTCONN; 835 /* Hack to wake up other listeners, who can poll for 836 POLLHUP, even on eg. unconnected UDP sockets -- RR */ 837 default: 838 sk->sk_shutdown |= how; 839 if (sk->sk_prot->shutdown) 840 sk->sk_prot->shutdown(sk, how); 841 break; 842 843 /* Remaining two branches are temporary solution for missing 844 * close() in multithreaded environment. It is _not_ a good idea, 845 * but we have no choice until close() is repaired at VFS level. 846 */ 847 case TCP_LISTEN: 848 if (!(how & RCV_SHUTDOWN)) 849 break; 850 /* Fall through */ 851 case TCP_SYN_SENT: 852 err = sk->sk_prot->disconnect(sk, O_NONBLOCK); 853 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 854 break; 855 } 856 857 /* Wake up anyone sleeping in poll. */ 858 sk->sk_state_change(sk); 859 release_sock(sk); 860 return err; 861 } 862 EXPORT_SYMBOL(inet_shutdown); 863 864 /* 865 * ioctl() calls you can issue on an INET socket. Most of these are 866 * device configuration and stuff and very rarely used. Some ioctls 867 * pass on to the socket itself. 868 * 869 * NOTE: I like the idea of a module for the config stuff. ie ifconfig 870 * loads the devconfigure module does its configuring and unloads it. 871 * There's a good 20K of config code hanging around the kernel. 872 */ 873 874 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 875 { 876 struct sock *sk = sock->sk; 877 int err = 0; 878 struct net *net = sock_net(sk); 879 880 switch (cmd) { 881 case SIOCGSTAMP: 882 err = sock_get_timestamp(sk, (struct timeval __user *)arg); 883 break; 884 case SIOCGSTAMPNS: 885 err = sock_get_timestampns(sk, (struct timespec __user *)arg); 886 break; 887 case SIOCADDRT: 888 case SIOCDELRT: 889 case SIOCRTMSG: 890 err = ip_rt_ioctl(net, cmd, (void __user *)arg); 891 break; 892 case SIOCDARP: 893 case SIOCGARP: 894 case SIOCSARP: 895 err = arp_ioctl(net, cmd, (void __user *)arg); 896 break; 897 case SIOCGIFADDR: 898 case SIOCSIFADDR: 899 case SIOCGIFBRDADDR: 900 case SIOCSIFBRDADDR: 901 case SIOCGIFNETMASK: 902 case SIOCSIFNETMASK: 903 case SIOCGIFDSTADDR: 904 case SIOCSIFDSTADDR: 905 case SIOCSIFPFLAGS: 906 case SIOCGIFPFLAGS: 907 case SIOCSIFFLAGS: 908 err = devinet_ioctl(net, cmd, (void __user *)arg); 909 break; 910 default: 911 if (sk->sk_prot->ioctl) 912 err = sk->sk_prot->ioctl(sk, cmd, arg); 913 else 914 err = -ENOIOCTLCMD; 915 break; 916 } 917 return err; 918 } 919 EXPORT_SYMBOL(inet_ioctl); 920 921 #ifdef CONFIG_COMPAT 922 static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 923 { 924 struct sock *sk = sock->sk; 925 int err = -ENOIOCTLCMD; 926 927 if (sk->sk_prot->compat_ioctl) 928 err = sk->sk_prot->compat_ioctl(sk, cmd, arg); 929 930 return err; 931 } 932 #endif 933 934 const struct proto_ops inet_stream_ops = { 935 .family = PF_INET, 936 .owner = THIS_MODULE, 937 .release = inet_release, 938 .bind = inet_bind, 939 .connect = inet_stream_connect, 940 .socketpair = sock_no_socketpair, 941 .accept = inet_accept, 942 .getname = inet_getname, 943 .poll = tcp_poll, 944 .ioctl = inet_ioctl, 945 .listen = inet_listen, 946 .shutdown = inet_shutdown, 947 .setsockopt = sock_common_setsockopt, 948 .getsockopt = sock_common_getsockopt, 949 .sendmsg = inet_sendmsg, 950 .recvmsg = inet_recvmsg, 951 .mmap = sock_no_mmap, 952 .sendpage = inet_sendpage, 953 .splice_read = tcp_splice_read, 954 #ifdef CONFIG_COMPAT 955 .compat_setsockopt = compat_sock_common_setsockopt, 956 .compat_getsockopt = compat_sock_common_getsockopt, 957 .compat_ioctl = inet_compat_ioctl, 958 #endif 959 }; 960 EXPORT_SYMBOL(inet_stream_ops); 961 962 const struct proto_ops inet_dgram_ops = { 963 .family = PF_INET, 964 .owner = THIS_MODULE, 965 .release = inet_release, 966 .bind = inet_bind, 967 .connect = inet_dgram_connect, 968 .socketpair = sock_no_socketpair, 969 .accept = sock_no_accept, 970 .getname = inet_getname, 971 .poll = udp_poll, 972 .ioctl = inet_ioctl, 973 .listen = sock_no_listen, 974 .shutdown = inet_shutdown, 975 .setsockopt = sock_common_setsockopt, 976 .getsockopt = sock_common_getsockopt, 977 .sendmsg = inet_sendmsg, 978 .recvmsg = inet_recvmsg, 979 .mmap = sock_no_mmap, 980 .sendpage = inet_sendpage, 981 #ifdef CONFIG_COMPAT 982 .compat_setsockopt = compat_sock_common_setsockopt, 983 .compat_getsockopt = compat_sock_common_getsockopt, 984 .compat_ioctl = inet_compat_ioctl, 985 #endif 986 }; 987 EXPORT_SYMBOL(inet_dgram_ops); 988 989 /* 990 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 991 * udp_poll 992 */ 993 static const struct proto_ops inet_sockraw_ops = { 994 .family = PF_INET, 995 .owner = THIS_MODULE, 996 .release = inet_release, 997 .bind = inet_bind, 998 .connect = inet_dgram_connect, 999 .socketpair = sock_no_socketpair, 1000 .accept = sock_no_accept, 1001 .getname = inet_getname, 1002 .poll = datagram_poll, 1003 .ioctl = inet_ioctl, 1004 .listen = sock_no_listen, 1005 .shutdown = inet_shutdown, 1006 .setsockopt = sock_common_setsockopt, 1007 .getsockopt = sock_common_getsockopt, 1008 .sendmsg = inet_sendmsg, 1009 .recvmsg = inet_recvmsg, 1010 .mmap = sock_no_mmap, 1011 .sendpage = inet_sendpage, 1012 #ifdef CONFIG_COMPAT 1013 .compat_setsockopt = compat_sock_common_setsockopt, 1014 .compat_getsockopt = compat_sock_common_getsockopt, 1015 .compat_ioctl = inet_compat_ioctl, 1016 #endif 1017 }; 1018 1019 static const struct net_proto_family inet_family_ops = { 1020 .family = PF_INET, 1021 .create = inet_create, 1022 .owner = THIS_MODULE, 1023 }; 1024 1025 /* Upon startup we insert all the elements in inetsw_array[] into 1026 * the linked list inetsw. 1027 */ 1028 static struct inet_protosw inetsw_array[] = 1029 { 1030 { 1031 .type = SOCK_STREAM, 1032 .protocol = IPPROTO_TCP, 1033 .prot = &tcp_prot, 1034 .ops = &inet_stream_ops, 1035 .no_check = 0, 1036 .flags = INET_PROTOSW_PERMANENT | 1037 INET_PROTOSW_ICSK, 1038 }, 1039 1040 { 1041 .type = SOCK_DGRAM, 1042 .protocol = IPPROTO_UDP, 1043 .prot = &udp_prot, 1044 .ops = &inet_dgram_ops, 1045 .no_check = UDP_CSUM_DEFAULT, 1046 .flags = INET_PROTOSW_PERMANENT, 1047 }, 1048 1049 { 1050 .type = SOCK_DGRAM, 1051 .protocol = IPPROTO_ICMP, 1052 .prot = &ping_prot, 1053 .ops = &inet_dgram_ops, 1054 .no_check = UDP_CSUM_DEFAULT, 1055 .flags = INET_PROTOSW_REUSE, 1056 }, 1057 1058 { 1059 .type = SOCK_RAW, 1060 .protocol = IPPROTO_IP, /* wild card */ 1061 .prot = &raw_prot, 1062 .ops = &inet_sockraw_ops, 1063 .no_check = UDP_CSUM_DEFAULT, 1064 .flags = INET_PROTOSW_REUSE, 1065 } 1066 }; 1067 1068 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) 1069 1070 void inet_register_protosw(struct inet_protosw *p) 1071 { 1072 struct list_head *lh; 1073 struct inet_protosw *answer; 1074 int protocol = p->protocol; 1075 struct list_head *last_perm; 1076 1077 spin_lock_bh(&inetsw_lock); 1078 1079 if (p->type >= SOCK_MAX) 1080 goto out_illegal; 1081 1082 /* If we are trying to override a permanent protocol, bail. */ 1083 answer = NULL; 1084 last_perm = &inetsw[p->type]; 1085 list_for_each(lh, &inetsw[p->type]) { 1086 answer = list_entry(lh, struct inet_protosw, list); 1087 1088 /* Check only the non-wild match. */ 1089 if (INET_PROTOSW_PERMANENT & answer->flags) { 1090 if (protocol == answer->protocol) 1091 break; 1092 last_perm = lh; 1093 } 1094 1095 answer = NULL; 1096 } 1097 if (answer) 1098 goto out_permanent; 1099 1100 /* Add the new entry after the last permanent entry if any, so that 1101 * the new entry does not override a permanent entry when matched with 1102 * a wild-card protocol. But it is allowed to override any existing 1103 * non-permanent entry. This means that when we remove this entry, the 1104 * system automatically returns to the old behavior. 1105 */ 1106 list_add_rcu(&p->list, last_perm); 1107 out: 1108 spin_unlock_bh(&inetsw_lock); 1109 1110 return; 1111 1112 out_permanent: 1113 pr_err("Attempt to override permanent protocol %d\n", protocol); 1114 goto out; 1115 1116 out_illegal: 1117 pr_err("Ignoring attempt to register invalid socket type %d\n", 1118 p->type); 1119 goto out; 1120 } 1121 EXPORT_SYMBOL(inet_register_protosw); 1122 1123 void inet_unregister_protosw(struct inet_protosw *p) 1124 { 1125 if (INET_PROTOSW_PERMANENT & p->flags) { 1126 pr_err("Attempt to unregister permanent protocol %d\n", 1127 p->protocol); 1128 } else { 1129 spin_lock_bh(&inetsw_lock); 1130 list_del_rcu(&p->list); 1131 spin_unlock_bh(&inetsw_lock); 1132 1133 synchronize_net(); 1134 } 1135 } 1136 EXPORT_SYMBOL(inet_unregister_protosw); 1137 1138 /* 1139 * Shall we try to damage output packets if routing dev changes? 1140 */ 1141 1142 int sysctl_ip_dynaddr __read_mostly; 1143 1144 static int inet_sk_reselect_saddr(struct sock *sk) 1145 { 1146 struct inet_sock *inet = inet_sk(sk); 1147 __be32 old_saddr = inet->inet_saddr; 1148 __be32 daddr = inet->inet_daddr; 1149 struct flowi4 *fl4; 1150 struct rtable *rt; 1151 __be32 new_saddr; 1152 struct ip_options_rcu *inet_opt; 1153 1154 inet_opt = rcu_dereference_protected(inet->inet_opt, 1155 sock_owned_by_user(sk)); 1156 if (inet_opt && inet_opt->opt.srr) 1157 daddr = inet_opt->opt.faddr; 1158 1159 /* Query new route. */ 1160 fl4 = &inet->cork.fl.u.ip4; 1161 rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk), 1162 sk->sk_bound_dev_if, sk->sk_protocol, 1163 inet->inet_sport, inet->inet_dport, sk, false); 1164 if (IS_ERR(rt)) 1165 return PTR_ERR(rt); 1166 1167 sk_setup_caps(sk, &rt->dst); 1168 1169 new_saddr = fl4->saddr; 1170 1171 if (new_saddr == old_saddr) 1172 return 0; 1173 1174 if (sysctl_ip_dynaddr > 1) { 1175 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n", 1176 __func__, &old_saddr, &new_saddr); 1177 } 1178 1179 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr; 1180 1181 /* 1182 * XXX The only one ugly spot where we need to 1183 * XXX really change the sockets identity after 1184 * XXX it has entered the hashes. -DaveM 1185 * 1186 * Besides that, it does not check for connection 1187 * uniqueness. Wait for troubles. 1188 */ 1189 __sk_prot_rehash(sk); 1190 return 0; 1191 } 1192 1193 int inet_sk_rebuild_header(struct sock *sk) 1194 { 1195 struct inet_sock *inet = inet_sk(sk); 1196 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); 1197 __be32 daddr; 1198 struct ip_options_rcu *inet_opt; 1199 struct flowi4 *fl4; 1200 int err; 1201 1202 /* Route is OK, nothing to do. */ 1203 if (rt) 1204 return 0; 1205 1206 /* Reroute. */ 1207 rcu_read_lock(); 1208 inet_opt = rcu_dereference(inet->inet_opt); 1209 daddr = inet->inet_daddr; 1210 if (inet_opt && inet_opt->opt.srr) 1211 daddr = inet_opt->opt.faddr; 1212 rcu_read_unlock(); 1213 fl4 = &inet->cork.fl.u.ip4; 1214 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr, 1215 inet->inet_dport, inet->inet_sport, 1216 sk->sk_protocol, RT_CONN_FLAGS(sk), 1217 sk->sk_bound_dev_if); 1218 if (!IS_ERR(rt)) { 1219 err = 0; 1220 sk_setup_caps(sk, &rt->dst); 1221 } else { 1222 err = PTR_ERR(rt); 1223 1224 /* Routing failed... */ 1225 sk->sk_route_caps = 0; 1226 /* 1227 * Other protocols have to map its equivalent state to TCP_SYN_SENT. 1228 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme 1229 */ 1230 if (!sysctl_ip_dynaddr || 1231 sk->sk_state != TCP_SYN_SENT || 1232 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 1233 (err = inet_sk_reselect_saddr(sk)) != 0) 1234 sk->sk_err_soft = -err; 1235 } 1236 1237 return err; 1238 } 1239 EXPORT_SYMBOL(inet_sk_rebuild_header); 1240 1241 static int inet_gso_send_check(struct sk_buff *skb) 1242 { 1243 const struct net_offload *ops; 1244 const struct iphdr *iph; 1245 int proto; 1246 int ihl; 1247 int err = -EINVAL; 1248 1249 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1250 goto out; 1251 1252 iph = ip_hdr(skb); 1253 ihl = iph->ihl * 4; 1254 if (ihl < sizeof(*iph)) 1255 goto out; 1256 1257 if (unlikely(!pskb_may_pull(skb, ihl))) 1258 goto out; 1259 1260 __skb_pull(skb, ihl); 1261 skb_reset_transport_header(skb); 1262 iph = ip_hdr(skb); 1263 proto = iph->protocol; 1264 err = -EPROTONOSUPPORT; 1265 1266 rcu_read_lock(); 1267 ops = rcu_dereference(inet_offloads[proto]); 1268 if (likely(ops && ops->callbacks.gso_send_check)) 1269 err = ops->callbacks.gso_send_check(skb); 1270 rcu_read_unlock(); 1271 1272 out: 1273 return err; 1274 } 1275 1276 static struct sk_buff *inet_gso_segment(struct sk_buff *skb, 1277 netdev_features_t features) 1278 { 1279 struct sk_buff *segs = ERR_PTR(-EINVAL); 1280 const struct net_offload *ops; 1281 struct iphdr *iph; 1282 int proto; 1283 int ihl; 1284 int id; 1285 unsigned int offset = 0; 1286 1287 if (!(features & NETIF_F_V4_CSUM)) 1288 features &= ~NETIF_F_SG; 1289 1290 if (unlikely(skb_shinfo(skb)->gso_type & 1291 ~(SKB_GSO_TCPV4 | 1292 SKB_GSO_UDP | 1293 SKB_GSO_DODGY | 1294 SKB_GSO_TCP_ECN | 1295 SKB_GSO_GRE | 1296 0))) 1297 goto out; 1298 1299 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1300 goto out; 1301 1302 iph = ip_hdr(skb); 1303 ihl = iph->ihl * 4; 1304 if (ihl < sizeof(*iph)) 1305 goto out; 1306 1307 if (unlikely(!pskb_may_pull(skb, ihl))) 1308 goto out; 1309 1310 __skb_pull(skb, ihl); 1311 skb_reset_transport_header(skb); 1312 iph = ip_hdr(skb); 1313 id = ntohs(iph->id); 1314 proto = iph->protocol; 1315 segs = ERR_PTR(-EPROTONOSUPPORT); 1316 1317 rcu_read_lock(); 1318 ops = rcu_dereference(inet_offloads[proto]); 1319 if (likely(ops && ops->callbacks.gso_segment)) 1320 segs = ops->callbacks.gso_segment(skb, features); 1321 rcu_read_unlock(); 1322 1323 if (IS_ERR_OR_NULL(segs)) 1324 goto out; 1325 1326 skb = segs; 1327 do { 1328 iph = ip_hdr(skb); 1329 if (proto == IPPROTO_UDP) { 1330 iph->id = htons(id); 1331 iph->frag_off = htons(offset >> 3); 1332 if (skb->next != NULL) 1333 iph->frag_off |= htons(IP_MF); 1334 offset += (skb->len - skb->mac_len - iph->ihl * 4); 1335 } else { 1336 if (!(iph->frag_off & htons(IP_DF))) 1337 iph->id = htons(id++); 1338 } 1339 iph->tot_len = htons(skb->len - skb->mac_len); 1340 iph->check = 0; 1341 iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl); 1342 } while ((skb = skb->next)); 1343 1344 out: 1345 return segs; 1346 } 1347 1348 static struct sk_buff **inet_gro_receive(struct sk_buff **head, 1349 struct sk_buff *skb) 1350 { 1351 const struct net_offload *ops; 1352 struct sk_buff **pp = NULL; 1353 struct sk_buff *p; 1354 const struct iphdr *iph; 1355 unsigned int hlen; 1356 unsigned int off; 1357 unsigned int id; 1358 int flush = 1; 1359 int proto; 1360 1361 off = skb_gro_offset(skb); 1362 hlen = off + sizeof(*iph); 1363 iph = skb_gro_header_fast(skb, off); 1364 if (skb_gro_header_hard(skb, hlen)) { 1365 iph = skb_gro_header_slow(skb, hlen, off); 1366 if (unlikely(!iph)) 1367 goto out; 1368 } 1369 1370 proto = iph->protocol; 1371 1372 rcu_read_lock(); 1373 ops = rcu_dereference(inet_offloads[proto]); 1374 if (!ops || !ops->callbacks.gro_receive) 1375 goto out_unlock; 1376 1377 if (*(u8 *)iph != 0x45) 1378 goto out_unlock; 1379 1380 if (unlikely(ip_fast_csum((u8 *)iph, 5))) 1381 goto out_unlock; 1382 1383 id = ntohl(*(__be32 *)&iph->id); 1384 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id ^ IP_DF)); 1385 id >>= 16; 1386 1387 for (p = *head; p; p = p->next) { 1388 struct iphdr *iph2; 1389 1390 if (!NAPI_GRO_CB(p)->same_flow) 1391 continue; 1392 1393 iph2 = ip_hdr(p); 1394 1395 if ((iph->protocol ^ iph2->protocol) | 1396 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) | 1397 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) { 1398 NAPI_GRO_CB(p)->same_flow = 0; 1399 continue; 1400 } 1401 1402 /* All fields must match except length and checksum. */ 1403 NAPI_GRO_CB(p)->flush |= 1404 (iph->ttl ^ iph2->ttl) | 1405 (iph->tos ^ iph2->tos) | 1406 ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id); 1407 1408 NAPI_GRO_CB(p)->flush |= flush; 1409 } 1410 1411 NAPI_GRO_CB(skb)->flush |= flush; 1412 skb_gro_pull(skb, sizeof(*iph)); 1413 skb_set_transport_header(skb, skb_gro_offset(skb)); 1414 1415 pp = ops->callbacks.gro_receive(head, skb); 1416 1417 out_unlock: 1418 rcu_read_unlock(); 1419 1420 out: 1421 NAPI_GRO_CB(skb)->flush |= flush; 1422 1423 return pp; 1424 } 1425 1426 static int inet_gro_complete(struct sk_buff *skb) 1427 { 1428 __be16 newlen = htons(skb->len - skb_network_offset(skb)); 1429 struct iphdr *iph = ip_hdr(skb); 1430 const struct net_offload *ops; 1431 int proto = iph->protocol; 1432 int err = -ENOSYS; 1433 1434 csum_replace2(&iph->check, iph->tot_len, newlen); 1435 iph->tot_len = newlen; 1436 1437 rcu_read_lock(); 1438 ops = rcu_dereference(inet_offloads[proto]); 1439 if (WARN_ON(!ops || !ops->callbacks.gro_complete)) 1440 goto out_unlock; 1441 1442 err = ops->callbacks.gro_complete(skb); 1443 1444 out_unlock: 1445 rcu_read_unlock(); 1446 1447 return err; 1448 } 1449 1450 int inet_ctl_sock_create(struct sock **sk, unsigned short family, 1451 unsigned short type, unsigned char protocol, 1452 struct net *net) 1453 { 1454 struct socket *sock; 1455 int rc = sock_create_kern(family, type, protocol, &sock); 1456 1457 if (rc == 0) { 1458 *sk = sock->sk; 1459 (*sk)->sk_allocation = GFP_ATOMIC; 1460 /* 1461 * Unhash it so that IP input processing does not even see it, 1462 * we do not wish this socket to see incoming packets. 1463 */ 1464 (*sk)->sk_prot->unhash(*sk); 1465 1466 sk_change_net(*sk, net); 1467 } 1468 return rc; 1469 } 1470 EXPORT_SYMBOL_GPL(inet_ctl_sock_create); 1471 1472 unsigned long snmp_fold_field(void __percpu *mib[], int offt) 1473 { 1474 unsigned long res = 0; 1475 int i, j; 1476 1477 for_each_possible_cpu(i) { 1478 for (j = 0; j < SNMP_ARRAY_SZ; j++) 1479 res += *(((unsigned long *) per_cpu_ptr(mib[j], i)) + offt); 1480 } 1481 return res; 1482 } 1483 EXPORT_SYMBOL_GPL(snmp_fold_field); 1484 1485 #if BITS_PER_LONG==32 1486 1487 u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t syncp_offset) 1488 { 1489 u64 res = 0; 1490 int cpu; 1491 1492 for_each_possible_cpu(cpu) { 1493 void *bhptr; 1494 struct u64_stats_sync *syncp; 1495 u64 v; 1496 unsigned int start; 1497 1498 bhptr = per_cpu_ptr(mib[0], cpu); 1499 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset); 1500 do { 1501 start = u64_stats_fetch_begin_bh(syncp); 1502 v = *(((u64 *) bhptr) + offt); 1503 } while (u64_stats_fetch_retry_bh(syncp, start)); 1504 1505 res += v; 1506 } 1507 return res; 1508 } 1509 EXPORT_SYMBOL_GPL(snmp_fold_field64); 1510 #endif 1511 1512 int snmp_mib_init(void __percpu *ptr[2], size_t mibsize, size_t align) 1513 { 1514 BUG_ON(ptr == NULL); 1515 ptr[0] = __alloc_percpu(mibsize, align); 1516 if (!ptr[0]) 1517 return -ENOMEM; 1518 #if SNMP_ARRAY_SZ == 2 1519 ptr[1] = __alloc_percpu(mibsize, align); 1520 if (!ptr[1]) { 1521 free_percpu(ptr[0]); 1522 ptr[0] = NULL; 1523 return -ENOMEM; 1524 } 1525 #endif 1526 return 0; 1527 } 1528 EXPORT_SYMBOL_GPL(snmp_mib_init); 1529 1530 void snmp_mib_free(void __percpu *ptr[SNMP_ARRAY_SZ]) 1531 { 1532 int i; 1533 1534 BUG_ON(ptr == NULL); 1535 for (i = 0; i < SNMP_ARRAY_SZ; i++) { 1536 free_percpu(ptr[i]); 1537 ptr[i] = NULL; 1538 } 1539 } 1540 EXPORT_SYMBOL_GPL(snmp_mib_free); 1541 1542 #ifdef CONFIG_IP_MULTICAST 1543 static const struct net_protocol igmp_protocol = { 1544 .handler = igmp_rcv, 1545 .netns_ok = 1, 1546 }; 1547 #endif 1548 1549 static const struct net_protocol tcp_protocol = { 1550 .early_demux = tcp_v4_early_demux, 1551 .handler = tcp_v4_rcv, 1552 .err_handler = tcp_v4_err, 1553 .no_policy = 1, 1554 .netns_ok = 1, 1555 }; 1556 1557 static const struct net_offload tcp_offload = { 1558 .callbacks = { 1559 .gso_send_check = tcp_v4_gso_send_check, 1560 .gso_segment = tcp_tso_segment, 1561 .gro_receive = tcp4_gro_receive, 1562 .gro_complete = tcp4_gro_complete, 1563 }, 1564 }; 1565 1566 static const struct net_protocol udp_protocol = { 1567 .handler = udp_rcv, 1568 .err_handler = udp_err, 1569 .no_policy = 1, 1570 .netns_ok = 1, 1571 }; 1572 1573 static const struct net_offload udp_offload = { 1574 .callbacks = { 1575 .gso_send_check = udp4_ufo_send_check, 1576 .gso_segment = udp4_ufo_fragment, 1577 }, 1578 }; 1579 1580 static const struct net_protocol icmp_protocol = { 1581 .handler = icmp_rcv, 1582 .err_handler = icmp_err, 1583 .no_policy = 1, 1584 .netns_ok = 1, 1585 }; 1586 1587 static __net_init int ipv4_mib_init_net(struct net *net) 1588 { 1589 if (snmp_mib_init((void __percpu **)net->mib.tcp_statistics, 1590 sizeof(struct tcp_mib), 1591 __alignof__(struct tcp_mib)) < 0) 1592 goto err_tcp_mib; 1593 if (snmp_mib_init((void __percpu **)net->mib.ip_statistics, 1594 sizeof(struct ipstats_mib), 1595 __alignof__(struct ipstats_mib)) < 0) 1596 goto err_ip_mib; 1597 if (snmp_mib_init((void __percpu **)net->mib.net_statistics, 1598 sizeof(struct linux_mib), 1599 __alignof__(struct linux_mib)) < 0) 1600 goto err_net_mib; 1601 if (snmp_mib_init((void __percpu **)net->mib.udp_statistics, 1602 sizeof(struct udp_mib), 1603 __alignof__(struct udp_mib)) < 0) 1604 goto err_udp_mib; 1605 if (snmp_mib_init((void __percpu **)net->mib.udplite_statistics, 1606 sizeof(struct udp_mib), 1607 __alignof__(struct udp_mib)) < 0) 1608 goto err_udplite_mib; 1609 if (snmp_mib_init((void __percpu **)net->mib.icmp_statistics, 1610 sizeof(struct icmp_mib), 1611 __alignof__(struct icmp_mib)) < 0) 1612 goto err_icmp_mib; 1613 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib), 1614 GFP_KERNEL); 1615 if (!net->mib.icmpmsg_statistics) 1616 goto err_icmpmsg_mib; 1617 1618 tcp_mib_init(net); 1619 return 0; 1620 1621 err_icmpmsg_mib: 1622 snmp_mib_free((void __percpu **)net->mib.icmp_statistics); 1623 err_icmp_mib: 1624 snmp_mib_free((void __percpu **)net->mib.udplite_statistics); 1625 err_udplite_mib: 1626 snmp_mib_free((void __percpu **)net->mib.udp_statistics); 1627 err_udp_mib: 1628 snmp_mib_free((void __percpu **)net->mib.net_statistics); 1629 err_net_mib: 1630 snmp_mib_free((void __percpu **)net->mib.ip_statistics); 1631 err_ip_mib: 1632 snmp_mib_free((void __percpu **)net->mib.tcp_statistics); 1633 err_tcp_mib: 1634 return -ENOMEM; 1635 } 1636 1637 static __net_exit void ipv4_mib_exit_net(struct net *net) 1638 { 1639 kfree(net->mib.icmpmsg_statistics); 1640 snmp_mib_free((void __percpu **)net->mib.icmp_statistics); 1641 snmp_mib_free((void __percpu **)net->mib.udplite_statistics); 1642 snmp_mib_free((void __percpu **)net->mib.udp_statistics); 1643 snmp_mib_free((void __percpu **)net->mib.net_statistics); 1644 snmp_mib_free((void __percpu **)net->mib.ip_statistics); 1645 snmp_mib_free((void __percpu **)net->mib.tcp_statistics); 1646 } 1647 1648 static __net_initdata struct pernet_operations ipv4_mib_ops = { 1649 .init = ipv4_mib_init_net, 1650 .exit = ipv4_mib_exit_net, 1651 }; 1652 1653 static int __init init_ipv4_mibs(void) 1654 { 1655 return register_pernet_subsys(&ipv4_mib_ops); 1656 } 1657 1658 static int ipv4_proc_init(void); 1659 1660 /* 1661 * IP protocol layer initialiser 1662 */ 1663 1664 static struct packet_offload ip_packet_offload __read_mostly = { 1665 .type = cpu_to_be16(ETH_P_IP), 1666 .callbacks = { 1667 .gso_send_check = inet_gso_send_check, 1668 .gso_segment = inet_gso_segment, 1669 .gro_receive = inet_gro_receive, 1670 .gro_complete = inet_gro_complete, 1671 }, 1672 }; 1673 1674 static int __init ipv4_offload_init(void) 1675 { 1676 /* 1677 * Add offloads 1678 */ 1679 if (inet_add_offload(&udp_offload, IPPROTO_UDP) < 0) 1680 pr_crit("%s: Cannot add UDP protocol offload\n", __func__); 1681 if (inet_add_offload(&tcp_offload, IPPROTO_TCP) < 0) 1682 pr_crit("%s: Cannot add TCP protocol offlaod\n", __func__); 1683 1684 dev_add_offload(&ip_packet_offload); 1685 return 0; 1686 } 1687 1688 fs_initcall(ipv4_offload_init); 1689 1690 static struct packet_type ip_packet_type __read_mostly = { 1691 .type = cpu_to_be16(ETH_P_IP), 1692 .func = ip_rcv, 1693 }; 1694 1695 static int __init inet_init(void) 1696 { 1697 struct inet_protosw *q; 1698 struct list_head *r; 1699 int rc = -EINVAL; 1700 1701 BUILD_BUG_ON(sizeof(struct inet_skb_parm) > FIELD_SIZEOF(struct sk_buff, cb)); 1702 1703 sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL); 1704 if (!sysctl_local_reserved_ports) 1705 goto out; 1706 1707 rc = proto_register(&tcp_prot, 1); 1708 if (rc) 1709 goto out_free_reserved_ports; 1710 1711 rc = proto_register(&udp_prot, 1); 1712 if (rc) 1713 goto out_unregister_tcp_proto; 1714 1715 rc = proto_register(&raw_prot, 1); 1716 if (rc) 1717 goto out_unregister_udp_proto; 1718 1719 rc = proto_register(&ping_prot, 1); 1720 if (rc) 1721 goto out_unregister_raw_proto; 1722 1723 /* 1724 * Tell SOCKET that we are alive... 1725 */ 1726 1727 (void)sock_register(&inet_family_ops); 1728 1729 #ifdef CONFIG_SYSCTL 1730 ip_static_sysctl_init(); 1731 #endif 1732 1733 tcp_prot.sysctl_mem = init_net.ipv4.sysctl_tcp_mem; 1734 1735 /* 1736 * Add all the base protocols. 1737 */ 1738 1739 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 1740 pr_crit("%s: Cannot add ICMP protocol\n", __func__); 1741 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) 1742 pr_crit("%s: Cannot add UDP protocol\n", __func__); 1743 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) 1744 pr_crit("%s: Cannot add TCP protocol\n", __func__); 1745 #ifdef CONFIG_IP_MULTICAST 1746 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 1747 pr_crit("%s: Cannot add IGMP protocol\n", __func__); 1748 #endif 1749 1750 /* Register the socket-side information for inet_create. */ 1751 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 1752 INIT_LIST_HEAD(r); 1753 1754 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 1755 inet_register_protosw(q); 1756 1757 /* 1758 * Set the ARP module up 1759 */ 1760 1761 arp_init(); 1762 1763 /* 1764 * Set the IP module up 1765 */ 1766 1767 ip_init(); 1768 1769 tcp_v4_init(); 1770 1771 /* Setup TCP slab cache for open requests. */ 1772 tcp_init(); 1773 1774 /* Setup UDP memory threshold */ 1775 udp_init(); 1776 1777 /* Add UDP-Lite (RFC 3828) */ 1778 udplite4_register(); 1779 1780 ping_init(); 1781 1782 /* 1783 * Set the ICMP layer up 1784 */ 1785 1786 if (icmp_init() < 0) 1787 panic("Failed to create the ICMP control socket.\n"); 1788 1789 /* 1790 * Initialise the multicast router 1791 */ 1792 #if defined(CONFIG_IP_MROUTE) 1793 if (ip_mr_init()) 1794 pr_crit("%s: Cannot init ipv4 mroute\n", __func__); 1795 #endif 1796 /* 1797 * Initialise per-cpu ipv4 mibs 1798 */ 1799 1800 if (init_ipv4_mibs()) 1801 pr_crit("%s: Cannot init ipv4 mibs\n", __func__); 1802 1803 ipv4_proc_init(); 1804 1805 ipfrag_init(); 1806 1807 dev_add_pack(&ip_packet_type); 1808 1809 rc = 0; 1810 out: 1811 return rc; 1812 out_unregister_raw_proto: 1813 proto_unregister(&raw_prot); 1814 out_unregister_udp_proto: 1815 proto_unregister(&udp_prot); 1816 out_unregister_tcp_proto: 1817 proto_unregister(&tcp_prot); 1818 out_free_reserved_ports: 1819 kfree(sysctl_local_reserved_ports); 1820 goto out; 1821 } 1822 1823 fs_initcall(inet_init); 1824 1825 /* ------------------------------------------------------------------------ */ 1826 1827 #ifdef CONFIG_PROC_FS 1828 static int __init ipv4_proc_init(void) 1829 { 1830 int rc = 0; 1831 1832 if (raw_proc_init()) 1833 goto out_raw; 1834 if (tcp4_proc_init()) 1835 goto out_tcp; 1836 if (udp4_proc_init()) 1837 goto out_udp; 1838 if (ping_proc_init()) 1839 goto out_ping; 1840 if (ip_misc_proc_init()) 1841 goto out_misc; 1842 out: 1843 return rc; 1844 out_misc: 1845 ping_proc_exit(); 1846 out_ping: 1847 udp4_proc_exit(); 1848 out_udp: 1849 tcp4_proc_exit(); 1850 out_tcp: 1851 raw_proc_exit(); 1852 out_raw: 1853 rc = -ENOMEM; 1854 goto out; 1855 } 1856 1857 #else /* CONFIG_PROC_FS */ 1858 static int __init ipv4_proc_init(void) 1859 { 1860 return 0; 1861 } 1862 #endif /* CONFIG_PROC_FS */ 1863 1864 MODULE_ALIAS_NETPROTO(PF_INET); 1865 1866