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 sk_refcnt_debug_dec(sk); 161 } 162 EXPORT_SYMBOL(inet_sock_destruct); 163 164 /* 165 * The routines beyond this point handle the behaviour of an AF_INET 166 * socket object. Mostly it punts to the subprotocols of IP to do 167 * the work. 168 */ 169 170 /* 171 * Automatically bind an unbound socket. 172 */ 173 174 static int inet_autobind(struct sock *sk) 175 { 176 struct inet_sock *inet; 177 /* We may need to bind the socket. */ 178 lock_sock(sk); 179 inet = inet_sk(sk); 180 if (!inet->inet_num) { 181 if (sk->sk_prot->get_port(sk, 0)) { 182 release_sock(sk); 183 return -EAGAIN; 184 } 185 inet->inet_sport = htons(inet->inet_num); 186 } 187 release_sock(sk); 188 return 0; 189 } 190 191 /* 192 * Move a socket into listening state. 193 */ 194 int inet_listen(struct socket *sock, int backlog) 195 { 196 struct sock *sk = sock->sk; 197 unsigned char old_state; 198 int err; 199 200 lock_sock(sk); 201 202 err = -EINVAL; 203 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM) 204 goto out; 205 206 old_state = sk->sk_state; 207 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN))) 208 goto out; 209 210 /* Really, if the socket is already in listen state 211 * we can only allow the backlog to be adjusted. 212 */ 213 if (old_state != TCP_LISTEN) { 214 err = inet_csk_listen_start(sk, backlog); 215 if (err) 216 goto out; 217 } 218 sk->sk_max_ack_backlog = backlog; 219 err = 0; 220 221 out: 222 release_sock(sk); 223 return err; 224 } 225 EXPORT_SYMBOL(inet_listen); 226 227 u32 inet_ehash_secret __read_mostly; 228 EXPORT_SYMBOL(inet_ehash_secret); 229 230 /* 231 * inet_ehash_secret must be set exactly once 232 */ 233 void build_ehash_secret(void) 234 { 235 u32 rnd; 236 237 do { 238 get_random_bytes(&rnd, sizeof(rnd)); 239 } while (rnd == 0); 240 241 cmpxchg(&inet_ehash_secret, 0, rnd); 242 } 243 EXPORT_SYMBOL(build_ehash_secret); 244 245 static inline int inet_netns_ok(struct net *net, int protocol) 246 { 247 int hash; 248 const struct net_protocol *ipprot; 249 250 if (net_eq(net, &init_net)) 251 return 1; 252 253 hash = protocol & (MAX_INET_PROTOS - 1); 254 ipprot = rcu_dereference(inet_protos[hash]); 255 256 if (ipprot == NULL) 257 /* raw IP is OK */ 258 return 1; 259 return ipprot->netns_ok; 260 } 261 262 /* 263 * Create an inet socket. 264 */ 265 266 static int inet_create(struct net *net, struct socket *sock, int protocol, 267 int kern) 268 { 269 struct sock *sk; 270 struct inet_protosw *answer; 271 struct inet_sock *inet; 272 struct proto *answer_prot; 273 unsigned char answer_flags; 274 char answer_no_check; 275 int try_loading_module = 0; 276 int err; 277 278 if (unlikely(!inet_ehash_secret)) 279 if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM) 280 build_ehash_secret(); 281 282 sock->state = SS_UNCONNECTED; 283 284 /* Look for the requested type/protocol pair. */ 285 lookup_protocol: 286 err = -ESOCKTNOSUPPORT; 287 rcu_read_lock(); 288 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) { 289 290 err = 0; 291 /* Check the non-wild match. */ 292 if (protocol == answer->protocol) { 293 if (protocol != IPPROTO_IP) 294 break; 295 } else { 296 /* Check for the two wild cases. */ 297 if (IPPROTO_IP == protocol) { 298 protocol = answer->protocol; 299 break; 300 } 301 if (IPPROTO_IP == answer->protocol) 302 break; 303 } 304 err = -EPROTONOSUPPORT; 305 } 306 307 if (unlikely(err)) { 308 if (try_loading_module < 2) { 309 rcu_read_unlock(); 310 /* 311 * Be more specific, e.g. net-pf-2-proto-132-type-1 312 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) 313 */ 314 if (++try_loading_module == 1) 315 request_module("net-pf-%d-proto-%d-type-%d", 316 PF_INET, protocol, sock->type); 317 /* 318 * Fall back to generic, e.g. net-pf-2-proto-132 319 * (net-pf-PF_INET-proto-IPPROTO_SCTP) 320 */ 321 else 322 request_module("net-pf-%d-proto-%d", 323 PF_INET, protocol); 324 goto lookup_protocol; 325 } else 326 goto out_rcu_unlock; 327 } 328 329 err = -EPERM; 330 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW)) 331 goto out_rcu_unlock; 332 333 err = -EAFNOSUPPORT; 334 if (!inet_netns_ok(net, protocol)) 335 goto out_rcu_unlock; 336 337 sock->ops = answer->ops; 338 answer_prot = answer->prot; 339 answer_no_check = answer->no_check; 340 answer_flags = answer->flags; 341 rcu_read_unlock(); 342 343 WARN_ON(answer_prot->slab == NULL); 344 345 err = -ENOBUFS; 346 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot); 347 if (sk == NULL) 348 goto out; 349 350 err = 0; 351 sk->sk_no_check = answer_no_check; 352 if (INET_PROTOSW_REUSE & answer_flags) 353 sk->sk_reuse = 1; 354 355 inet = inet_sk(sk); 356 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 357 358 inet->nodefrag = 0; 359 360 if (SOCK_RAW == sock->type) { 361 inet->inet_num = protocol; 362 if (IPPROTO_RAW == protocol) 363 inet->hdrincl = 1; 364 } 365 366 if (ipv4_config.no_pmtu_disc) 367 inet->pmtudisc = IP_PMTUDISC_DONT; 368 else 369 inet->pmtudisc = IP_PMTUDISC_WANT; 370 371 inet->inet_id = 0; 372 373 sock_init_data(sock, sk); 374 375 sk->sk_destruct = inet_sock_destruct; 376 sk->sk_protocol = protocol; 377 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 378 379 inet->uc_ttl = -1; 380 inet->mc_loop = 1; 381 inet->mc_ttl = 1; 382 inet->mc_all = 1; 383 inet->mc_index = 0; 384 inet->mc_list = NULL; 385 inet->rcv_tos = 0; 386 387 sk_refcnt_debug_inc(sk); 388 389 if (inet->inet_num) { 390 /* It assumes that any protocol which allows 391 * the user to assign a number at socket 392 * creation time automatically 393 * shares. 394 */ 395 inet->inet_sport = htons(inet->inet_num); 396 /* Add to protocol hash chains. */ 397 sk->sk_prot->hash(sk); 398 } 399 400 if (sk->sk_prot->init) { 401 err = sk->sk_prot->init(sk); 402 if (err) 403 sk_common_release(sk); 404 } 405 out: 406 return err; 407 out_rcu_unlock: 408 rcu_read_unlock(); 409 goto out; 410 } 411 412 413 /* 414 * The peer socket should always be NULL (or else). When we call this 415 * function we are destroying the object and from then on nobody 416 * should refer to it. 417 */ 418 int inet_release(struct socket *sock) 419 { 420 struct sock *sk = sock->sk; 421 422 if (sk) { 423 long timeout; 424 425 sock_rps_reset_flow(sk); 426 427 /* Applications forget to leave groups before exiting */ 428 ip_mc_drop_socket(sk); 429 430 /* If linger is set, we don't return until the close 431 * is complete. Otherwise we return immediately. The 432 * actually closing is done the same either way. 433 * 434 * If the close is due to the process exiting, we never 435 * linger.. 436 */ 437 timeout = 0; 438 if (sock_flag(sk, SOCK_LINGER) && 439 !(current->flags & PF_EXITING)) 440 timeout = sk->sk_lingertime; 441 sock->sk = NULL; 442 sk->sk_prot->close(sk, timeout); 443 } 444 return 0; 445 } 446 EXPORT_SYMBOL(inet_release); 447 448 /* It is off by default, see below. */ 449 int sysctl_ip_nonlocal_bind __read_mostly; 450 EXPORT_SYMBOL(sysctl_ip_nonlocal_bind); 451 452 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 453 { 454 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 455 struct sock *sk = sock->sk; 456 struct inet_sock *inet = inet_sk(sk); 457 unsigned short snum; 458 int chk_addr_ret; 459 int err; 460 461 /* If the socket has its own bind function then use it. (RAW) */ 462 if (sk->sk_prot->bind) { 463 err = sk->sk_prot->bind(sk, uaddr, addr_len); 464 goto out; 465 } 466 err = -EINVAL; 467 if (addr_len < sizeof(struct sockaddr_in)) 468 goto out; 469 470 if (addr->sin_family != AF_INET) { 471 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET) 472 * only if s_addr is INADDR_ANY. 473 */ 474 err = -EAFNOSUPPORT; 475 if (addr->sin_family != AF_UNSPEC || 476 addr->sin_addr.s_addr != htonl(INADDR_ANY)) 477 goto out; 478 } 479 480 chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr); 481 482 /* Not specified by any standard per-se, however it breaks too 483 * many applications when removed. It is unfortunate since 484 * allowing applications to make a non-local bind solves 485 * several problems with systems using dynamic addressing. 486 * (ie. your servers still start up even if your ISDN link 487 * is temporarily down) 488 */ 489 err = -EADDRNOTAVAIL; 490 if (!sysctl_ip_nonlocal_bind && 491 !(inet->freebind || inet->transparent) && 492 addr->sin_addr.s_addr != htonl(INADDR_ANY) && 493 chk_addr_ret != RTN_LOCAL && 494 chk_addr_ret != RTN_MULTICAST && 495 chk_addr_ret != RTN_BROADCAST) 496 goto out; 497 498 snum = ntohs(addr->sin_port); 499 err = -EACCES; 500 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) 501 goto out; 502 503 /* We keep a pair of addresses. rcv_saddr is the one 504 * used by hash lookups, and saddr is used for transmit. 505 * 506 * In the BSD API these are the same except where it 507 * would be illegal to use them (multicast/broadcast) in 508 * which case the sending device address is used. 509 */ 510 lock_sock(sk); 511 512 /* Check these errors (active socket, double bind). */ 513 err = -EINVAL; 514 if (sk->sk_state != TCP_CLOSE || inet->inet_num) 515 goto out_release_sock; 516 517 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 518 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 519 inet->inet_saddr = 0; /* Use device */ 520 521 /* Make sure we are allowed to bind here. */ 522 if (sk->sk_prot->get_port(sk, snum)) { 523 inet->inet_saddr = inet->inet_rcv_saddr = 0; 524 err = -EADDRINUSE; 525 goto out_release_sock; 526 } 527 528 if (inet->inet_rcv_saddr) 529 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 530 if (snum) 531 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 532 inet->inet_sport = htons(inet->inet_num); 533 inet->inet_daddr = 0; 534 inet->inet_dport = 0; 535 sk_dst_reset(sk); 536 err = 0; 537 out_release_sock: 538 release_sock(sk); 539 out: 540 return err; 541 } 542 EXPORT_SYMBOL(inet_bind); 543 544 int inet_dgram_connect(struct socket *sock, struct sockaddr * uaddr, 545 int addr_len, int flags) 546 { 547 struct sock *sk = sock->sk; 548 549 if (addr_len < sizeof(uaddr->sa_family)) 550 return -EINVAL; 551 if (uaddr->sa_family == AF_UNSPEC) 552 return sk->sk_prot->disconnect(sk, flags); 553 554 if (!inet_sk(sk)->inet_num && inet_autobind(sk)) 555 return -EAGAIN; 556 return sk->sk_prot->connect(sk, (struct sockaddr *)uaddr, addr_len); 557 } 558 EXPORT_SYMBOL(inet_dgram_connect); 559 560 static long inet_wait_for_connect(struct sock *sk, long timeo) 561 { 562 DEFINE_WAIT(wait); 563 564 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 565 566 /* Basic assumption: if someone sets sk->sk_err, he _must_ 567 * change state of the socket from TCP_SYN_*. 568 * Connect() does not allow to get error notifications 569 * without closing the socket. 570 */ 571 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 572 release_sock(sk); 573 timeo = schedule_timeout(timeo); 574 lock_sock(sk); 575 if (signal_pending(current) || !timeo) 576 break; 577 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 578 } 579 finish_wait(sk_sleep(sk), &wait); 580 return timeo; 581 } 582 583 /* 584 * Connect to a remote host. There is regrettably still a little 585 * TCP 'magic' in here. 586 */ 587 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 588 int addr_len, int flags) 589 { 590 struct sock *sk = sock->sk; 591 int err; 592 long timeo; 593 594 if (addr_len < sizeof(uaddr->sa_family)) 595 return -EINVAL; 596 597 lock_sock(sk); 598 599 if (uaddr->sa_family == AF_UNSPEC) { 600 err = sk->sk_prot->disconnect(sk, flags); 601 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 602 goto out; 603 } 604 605 switch (sock->state) { 606 default: 607 err = -EINVAL; 608 goto out; 609 case SS_CONNECTED: 610 err = -EISCONN; 611 goto out; 612 case SS_CONNECTING: 613 err = -EALREADY; 614 /* Fall out of switch with err, set for this state */ 615 break; 616 case SS_UNCONNECTED: 617 err = -EISCONN; 618 if (sk->sk_state != TCP_CLOSE) 619 goto out; 620 621 err = sk->sk_prot->connect(sk, uaddr, addr_len); 622 if (err < 0) 623 goto out; 624 625 sock->state = SS_CONNECTING; 626 627 /* Just entered SS_CONNECTING state; the only 628 * difference is that return value in non-blocking 629 * case is EINPROGRESS, rather than EALREADY. 630 */ 631 err = -EINPROGRESS; 632 break; 633 } 634 635 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 636 637 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 638 /* Error code is set above */ 639 if (!timeo || !inet_wait_for_connect(sk, timeo)) 640 goto out; 641 642 err = sock_intr_errno(timeo); 643 if (signal_pending(current)) 644 goto out; 645 } 646 647 /* Connection was closed by RST, timeout, ICMP error 648 * or another process disconnected us. 649 */ 650 if (sk->sk_state == TCP_CLOSE) 651 goto sock_error; 652 653 /* sk->sk_err may be not zero now, if RECVERR was ordered by user 654 * and error was received after socket entered established state. 655 * Hence, it is handled normally after connect() return successfully. 656 */ 657 658 sock->state = SS_CONNECTED; 659 err = 0; 660 out: 661 release_sock(sk); 662 return err; 663 664 sock_error: 665 err = sock_error(sk) ? : -ECONNABORTED; 666 sock->state = SS_UNCONNECTED; 667 if (sk->sk_prot->disconnect(sk, flags)) 668 sock->state = SS_DISCONNECTING; 669 goto out; 670 } 671 EXPORT_SYMBOL(inet_stream_connect); 672 673 /* 674 * Accept a pending connection. The TCP layer now gives BSD semantics. 675 */ 676 677 int inet_accept(struct socket *sock, struct socket *newsock, int flags) 678 { 679 struct sock *sk1 = sock->sk; 680 int err = -EINVAL; 681 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err); 682 683 if (!sk2) 684 goto do_err; 685 686 lock_sock(sk2); 687 688 sock_rps_record_flow(sk2); 689 WARN_ON(!((1 << sk2->sk_state) & 690 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE))); 691 692 sock_graft(sk2, newsock); 693 694 newsock->state = SS_CONNECTED; 695 err = 0; 696 release_sock(sk2); 697 do_err: 698 return err; 699 } 700 EXPORT_SYMBOL(inet_accept); 701 702 703 /* 704 * This does both peername and sockname. 705 */ 706 int inet_getname(struct socket *sock, struct sockaddr *uaddr, 707 int *uaddr_len, int peer) 708 { 709 struct sock *sk = sock->sk; 710 struct inet_sock *inet = inet_sk(sk); 711 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr); 712 713 sin->sin_family = AF_INET; 714 if (peer) { 715 if (!inet->inet_dport || 716 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 717 peer == 1)) 718 return -ENOTCONN; 719 sin->sin_port = inet->inet_dport; 720 sin->sin_addr.s_addr = inet->inet_daddr; 721 } else { 722 __be32 addr = inet->inet_rcv_saddr; 723 if (!addr) 724 addr = inet->inet_saddr; 725 sin->sin_port = inet->inet_sport; 726 sin->sin_addr.s_addr = addr; 727 } 728 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 729 *uaddr_len = sizeof(*sin); 730 return 0; 731 } 732 EXPORT_SYMBOL(inet_getname); 733 734 int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 735 size_t size) 736 { 737 struct sock *sk = sock->sk; 738 739 sock_rps_record_flow(sk); 740 741 /* We may need to bind the socket. */ 742 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 743 inet_autobind(sk)) 744 return -EAGAIN; 745 746 return sk->sk_prot->sendmsg(iocb, sk, msg, size); 747 } 748 EXPORT_SYMBOL(inet_sendmsg); 749 750 ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, 751 size_t size, int flags) 752 { 753 struct sock *sk = sock->sk; 754 755 sock_rps_record_flow(sk); 756 757 /* We may need to bind the socket. */ 758 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 759 inet_autobind(sk)) 760 return -EAGAIN; 761 762 if (sk->sk_prot->sendpage) 763 return sk->sk_prot->sendpage(sk, page, offset, size, flags); 764 return sock_no_sendpage(sock, page, offset, size, flags); 765 } 766 EXPORT_SYMBOL(inet_sendpage); 767 768 int inet_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 769 size_t size, int flags) 770 { 771 struct sock *sk = sock->sk; 772 int addr_len = 0; 773 int err; 774 775 sock_rps_record_flow(sk); 776 777 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, 778 flags & ~MSG_DONTWAIT, &addr_len); 779 if (err >= 0) 780 msg->msg_namelen = addr_len; 781 return err; 782 } 783 EXPORT_SYMBOL(inet_recvmsg); 784 785 int inet_shutdown(struct socket *sock, int how) 786 { 787 struct sock *sk = sock->sk; 788 int err = 0; 789 790 /* This should really check to make sure 791 * the socket is a TCP socket. (WHY AC...) 792 */ 793 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and 794 1->2 bit 2 snds. 795 2->3 */ 796 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ 797 return -EINVAL; 798 799 lock_sock(sk); 800 if (sock->state == SS_CONNECTING) { 801 if ((1 << sk->sk_state) & 802 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) 803 sock->state = SS_DISCONNECTING; 804 else 805 sock->state = SS_CONNECTED; 806 } 807 808 switch (sk->sk_state) { 809 case TCP_CLOSE: 810 err = -ENOTCONN; 811 /* Hack to wake up other listeners, who can poll for 812 POLLHUP, even on eg. unconnected UDP sockets -- RR */ 813 default: 814 sk->sk_shutdown |= how; 815 if (sk->sk_prot->shutdown) 816 sk->sk_prot->shutdown(sk, how); 817 break; 818 819 /* Remaining two branches are temporary solution for missing 820 * close() in multithreaded environment. It is _not_ a good idea, 821 * but we have no choice until close() is repaired at VFS level. 822 */ 823 case TCP_LISTEN: 824 if (!(how & RCV_SHUTDOWN)) 825 break; 826 /* Fall through */ 827 case TCP_SYN_SENT: 828 err = sk->sk_prot->disconnect(sk, O_NONBLOCK); 829 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 830 break; 831 } 832 833 /* Wake up anyone sleeping in poll. */ 834 sk->sk_state_change(sk); 835 release_sock(sk); 836 return err; 837 } 838 EXPORT_SYMBOL(inet_shutdown); 839 840 /* 841 * ioctl() calls you can issue on an INET socket. Most of these are 842 * device configuration and stuff and very rarely used. Some ioctls 843 * pass on to the socket itself. 844 * 845 * NOTE: I like the idea of a module for the config stuff. ie ifconfig 846 * loads the devconfigure module does its configuring and unloads it. 847 * There's a good 20K of config code hanging around the kernel. 848 */ 849 850 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 851 { 852 struct sock *sk = sock->sk; 853 int err = 0; 854 struct net *net = sock_net(sk); 855 856 switch (cmd) { 857 case SIOCGSTAMP: 858 err = sock_get_timestamp(sk, (struct timeval __user *)arg); 859 break; 860 case SIOCGSTAMPNS: 861 err = sock_get_timestampns(sk, (struct timespec __user *)arg); 862 break; 863 case SIOCADDRT: 864 case SIOCDELRT: 865 case SIOCRTMSG: 866 err = ip_rt_ioctl(net, cmd, (void __user *)arg); 867 break; 868 case SIOCDARP: 869 case SIOCGARP: 870 case SIOCSARP: 871 err = arp_ioctl(net, cmd, (void __user *)arg); 872 break; 873 case SIOCGIFADDR: 874 case SIOCSIFADDR: 875 case SIOCGIFBRDADDR: 876 case SIOCSIFBRDADDR: 877 case SIOCGIFNETMASK: 878 case SIOCSIFNETMASK: 879 case SIOCGIFDSTADDR: 880 case SIOCSIFDSTADDR: 881 case SIOCSIFPFLAGS: 882 case SIOCGIFPFLAGS: 883 case SIOCSIFFLAGS: 884 err = devinet_ioctl(net, cmd, (void __user *)arg); 885 break; 886 default: 887 if (sk->sk_prot->ioctl) 888 err = sk->sk_prot->ioctl(sk, cmd, arg); 889 else 890 err = -ENOIOCTLCMD; 891 break; 892 } 893 return err; 894 } 895 EXPORT_SYMBOL(inet_ioctl); 896 897 #ifdef CONFIG_COMPAT 898 static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 899 { 900 struct sock *sk = sock->sk; 901 int err = -ENOIOCTLCMD; 902 903 if (sk->sk_prot->compat_ioctl) 904 err = sk->sk_prot->compat_ioctl(sk, cmd, arg); 905 906 return err; 907 } 908 #endif 909 910 const struct proto_ops inet_stream_ops = { 911 .family = PF_INET, 912 .owner = THIS_MODULE, 913 .release = inet_release, 914 .bind = inet_bind, 915 .connect = inet_stream_connect, 916 .socketpair = sock_no_socketpair, 917 .accept = inet_accept, 918 .getname = inet_getname, 919 .poll = tcp_poll, 920 .ioctl = inet_ioctl, 921 .listen = inet_listen, 922 .shutdown = inet_shutdown, 923 .setsockopt = sock_common_setsockopt, 924 .getsockopt = sock_common_getsockopt, 925 .sendmsg = inet_sendmsg, 926 .recvmsg = inet_recvmsg, 927 .mmap = sock_no_mmap, 928 .sendpage = inet_sendpage, 929 .splice_read = tcp_splice_read, 930 #ifdef CONFIG_COMPAT 931 .compat_setsockopt = compat_sock_common_setsockopt, 932 .compat_getsockopt = compat_sock_common_getsockopt, 933 .compat_ioctl = inet_compat_ioctl, 934 #endif 935 }; 936 EXPORT_SYMBOL(inet_stream_ops); 937 938 const struct proto_ops inet_dgram_ops = { 939 .family = PF_INET, 940 .owner = THIS_MODULE, 941 .release = inet_release, 942 .bind = inet_bind, 943 .connect = inet_dgram_connect, 944 .socketpair = sock_no_socketpair, 945 .accept = sock_no_accept, 946 .getname = inet_getname, 947 .poll = udp_poll, 948 .ioctl = inet_ioctl, 949 .listen = sock_no_listen, 950 .shutdown = inet_shutdown, 951 .setsockopt = sock_common_setsockopt, 952 .getsockopt = sock_common_getsockopt, 953 .sendmsg = inet_sendmsg, 954 .recvmsg = inet_recvmsg, 955 .mmap = sock_no_mmap, 956 .sendpage = inet_sendpage, 957 #ifdef CONFIG_COMPAT 958 .compat_setsockopt = compat_sock_common_setsockopt, 959 .compat_getsockopt = compat_sock_common_getsockopt, 960 .compat_ioctl = inet_compat_ioctl, 961 #endif 962 }; 963 EXPORT_SYMBOL(inet_dgram_ops); 964 965 /* 966 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 967 * udp_poll 968 */ 969 static const struct proto_ops inet_sockraw_ops = { 970 .family = PF_INET, 971 .owner = THIS_MODULE, 972 .release = inet_release, 973 .bind = inet_bind, 974 .connect = inet_dgram_connect, 975 .socketpair = sock_no_socketpair, 976 .accept = sock_no_accept, 977 .getname = inet_getname, 978 .poll = datagram_poll, 979 .ioctl = inet_ioctl, 980 .listen = sock_no_listen, 981 .shutdown = inet_shutdown, 982 .setsockopt = sock_common_setsockopt, 983 .getsockopt = sock_common_getsockopt, 984 .sendmsg = inet_sendmsg, 985 .recvmsg = inet_recvmsg, 986 .mmap = sock_no_mmap, 987 .sendpage = inet_sendpage, 988 #ifdef CONFIG_COMPAT 989 .compat_setsockopt = compat_sock_common_setsockopt, 990 .compat_getsockopt = compat_sock_common_getsockopt, 991 .compat_ioctl = inet_compat_ioctl, 992 #endif 993 }; 994 995 static const struct net_proto_family inet_family_ops = { 996 .family = PF_INET, 997 .create = inet_create, 998 .owner = THIS_MODULE, 999 }; 1000 1001 /* Upon startup we insert all the elements in inetsw_array[] into 1002 * the linked list inetsw. 1003 */ 1004 static struct inet_protosw inetsw_array[] = 1005 { 1006 { 1007 .type = SOCK_STREAM, 1008 .protocol = IPPROTO_TCP, 1009 .prot = &tcp_prot, 1010 .ops = &inet_stream_ops, 1011 .no_check = 0, 1012 .flags = INET_PROTOSW_PERMANENT | 1013 INET_PROTOSW_ICSK, 1014 }, 1015 1016 { 1017 .type = SOCK_DGRAM, 1018 .protocol = IPPROTO_UDP, 1019 .prot = &udp_prot, 1020 .ops = &inet_dgram_ops, 1021 .no_check = UDP_CSUM_DEFAULT, 1022 .flags = INET_PROTOSW_PERMANENT, 1023 }, 1024 1025 { 1026 .type = SOCK_DGRAM, 1027 .protocol = IPPROTO_ICMP, 1028 .prot = &ping_prot, 1029 .ops = &inet_dgram_ops, 1030 .no_check = UDP_CSUM_DEFAULT, 1031 .flags = INET_PROTOSW_REUSE, 1032 }, 1033 1034 { 1035 .type = SOCK_RAW, 1036 .protocol = IPPROTO_IP, /* wild card */ 1037 .prot = &raw_prot, 1038 .ops = &inet_sockraw_ops, 1039 .no_check = UDP_CSUM_DEFAULT, 1040 .flags = INET_PROTOSW_REUSE, 1041 } 1042 }; 1043 1044 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) 1045 1046 void inet_register_protosw(struct inet_protosw *p) 1047 { 1048 struct list_head *lh; 1049 struct inet_protosw *answer; 1050 int protocol = p->protocol; 1051 struct list_head *last_perm; 1052 1053 spin_lock_bh(&inetsw_lock); 1054 1055 if (p->type >= SOCK_MAX) 1056 goto out_illegal; 1057 1058 /* If we are trying to override a permanent protocol, bail. */ 1059 answer = NULL; 1060 last_perm = &inetsw[p->type]; 1061 list_for_each(lh, &inetsw[p->type]) { 1062 answer = list_entry(lh, struct inet_protosw, list); 1063 1064 /* Check only the non-wild match. */ 1065 if (INET_PROTOSW_PERMANENT & answer->flags) { 1066 if (protocol == answer->protocol) 1067 break; 1068 last_perm = lh; 1069 } 1070 1071 answer = NULL; 1072 } 1073 if (answer) 1074 goto out_permanent; 1075 1076 /* Add the new entry after the last permanent entry if any, so that 1077 * the new entry does not override a permanent entry when matched with 1078 * a wild-card protocol. But it is allowed to override any existing 1079 * non-permanent entry. This means that when we remove this entry, the 1080 * system automatically returns to the old behavior. 1081 */ 1082 list_add_rcu(&p->list, last_perm); 1083 out: 1084 spin_unlock_bh(&inetsw_lock); 1085 1086 return; 1087 1088 out_permanent: 1089 pr_err("Attempt to override permanent protocol %d\n", protocol); 1090 goto out; 1091 1092 out_illegal: 1093 pr_err("Ignoring attempt to register invalid socket type %d\n", 1094 p->type); 1095 goto out; 1096 } 1097 EXPORT_SYMBOL(inet_register_protosw); 1098 1099 void inet_unregister_protosw(struct inet_protosw *p) 1100 { 1101 if (INET_PROTOSW_PERMANENT & p->flags) { 1102 pr_err("Attempt to unregister permanent protocol %d\n", 1103 p->protocol); 1104 } else { 1105 spin_lock_bh(&inetsw_lock); 1106 list_del_rcu(&p->list); 1107 spin_unlock_bh(&inetsw_lock); 1108 1109 synchronize_net(); 1110 } 1111 } 1112 EXPORT_SYMBOL(inet_unregister_protosw); 1113 1114 /* 1115 * Shall we try to damage output packets if routing dev changes? 1116 */ 1117 1118 int sysctl_ip_dynaddr __read_mostly; 1119 1120 static int inet_sk_reselect_saddr(struct sock *sk) 1121 { 1122 struct inet_sock *inet = inet_sk(sk); 1123 __be32 old_saddr = inet->inet_saddr; 1124 __be32 daddr = inet->inet_daddr; 1125 struct flowi4 *fl4; 1126 struct rtable *rt; 1127 __be32 new_saddr; 1128 struct ip_options_rcu *inet_opt; 1129 1130 inet_opt = rcu_dereference_protected(inet->inet_opt, 1131 sock_owned_by_user(sk)); 1132 if (inet_opt && inet_opt->opt.srr) 1133 daddr = inet_opt->opt.faddr; 1134 1135 /* Query new route. */ 1136 fl4 = &inet->cork.fl.u.ip4; 1137 rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk), 1138 sk->sk_bound_dev_if, sk->sk_protocol, 1139 inet->inet_sport, inet->inet_dport, sk, false); 1140 if (IS_ERR(rt)) 1141 return PTR_ERR(rt); 1142 1143 sk_setup_caps(sk, &rt->dst); 1144 1145 new_saddr = fl4->saddr; 1146 1147 if (new_saddr == old_saddr) 1148 return 0; 1149 1150 if (sysctl_ip_dynaddr > 1) { 1151 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n", 1152 __func__, &old_saddr, &new_saddr); 1153 } 1154 1155 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr; 1156 1157 /* 1158 * XXX The only one ugly spot where we need to 1159 * XXX really change the sockets identity after 1160 * XXX it has entered the hashes. -DaveM 1161 * 1162 * Besides that, it does not check for connection 1163 * uniqueness. Wait for troubles. 1164 */ 1165 __sk_prot_rehash(sk); 1166 return 0; 1167 } 1168 1169 int inet_sk_rebuild_header(struct sock *sk) 1170 { 1171 struct inet_sock *inet = inet_sk(sk); 1172 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); 1173 __be32 daddr; 1174 struct ip_options_rcu *inet_opt; 1175 struct flowi4 *fl4; 1176 int err; 1177 1178 /* Route is OK, nothing to do. */ 1179 if (rt) 1180 return 0; 1181 1182 /* Reroute. */ 1183 rcu_read_lock(); 1184 inet_opt = rcu_dereference(inet->inet_opt); 1185 daddr = inet->inet_daddr; 1186 if (inet_opt && inet_opt->opt.srr) 1187 daddr = inet_opt->opt.faddr; 1188 rcu_read_unlock(); 1189 fl4 = &inet->cork.fl.u.ip4; 1190 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr, 1191 inet->inet_dport, inet->inet_sport, 1192 sk->sk_protocol, RT_CONN_FLAGS(sk), 1193 sk->sk_bound_dev_if); 1194 if (!IS_ERR(rt)) { 1195 err = 0; 1196 sk_setup_caps(sk, &rt->dst); 1197 } else { 1198 err = PTR_ERR(rt); 1199 1200 /* Routing failed... */ 1201 sk->sk_route_caps = 0; 1202 /* 1203 * Other protocols have to map its equivalent state to TCP_SYN_SENT. 1204 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme 1205 */ 1206 if (!sysctl_ip_dynaddr || 1207 sk->sk_state != TCP_SYN_SENT || 1208 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 1209 (err = inet_sk_reselect_saddr(sk)) != 0) 1210 sk->sk_err_soft = -err; 1211 } 1212 1213 return err; 1214 } 1215 EXPORT_SYMBOL(inet_sk_rebuild_header); 1216 1217 static int inet_gso_send_check(struct sk_buff *skb) 1218 { 1219 const struct iphdr *iph; 1220 const struct net_protocol *ops; 1221 int proto; 1222 int ihl; 1223 int err = -EINVAL; 1224 1225 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1226 goto out; 1227 1228 iph = ip_hdr(skb); 1229 ihl = iph->ihl * 4; 1230 if (ihl < sizeof(*iph)) 1231 goto out; 1232 1233 if (unlikely(!pskb_may_pull(skb, ihl))) 1234 goto out; 1235 1236 __skb_pull(skb, ihl); 1237 skb_reset_transport_header(skb); 1238 iph = ip_hdr(skb); 1239 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1240 err = -EPROTONOSUPPORT; 1241 1242 rcu_read_lock(); 1243 ops = rcu_dereference(inet_protos[proto]); 1244 if (likely(ops && ops->gso_send_check)) 1245 err = ops->gso_send_check(skb); 1246 rcu_read_unlock(); 1247 1248 out: 1249 return err; 1250 } 1251 1252 static struct sk_buff *inet_gso_segment(struct sk_buff *skb, 1253 netdev_features_t features) 1254 { 1255 struct sk_buff *segs = ERR_PTR(-EINVAL); 1256 struct iphdr *iph; 1257 const struct net_protocol *ops; 1258 int proto; 1259 int ihl; 1260 int id; 1261 unsigned int offset = 0; 1262 1263 if (!(features & NETIF_F_V4_CSUM)) 1264 features &= ~NETIF_F_SG; 1265 1266 if (unlikely(skb_shinfo(skb)->gso_type & 1267 ~(SKB_GSO_TCPV4 | 1268 SKB_GSO_UDP | 1269 SKB_GSO_DODGY | 1270 SKB_GSO_TCP_ECN | 1271 0))) 1272 goto out; 1273 1274 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1275 goto out; 1276 1277 iph = ip_hdr(skb); 1278 ihl = iph->ihl * 4; 1279 if (ihl < sizeof(*iph)) 1280 goto out; 1281 1282 if (unlikely(!pskb_may_pull(skb, ihl))) 1283 goto out; 1284 1285 __skb_pull(skb, ihl); 1286 skb_reset_transport_header(skb); 1287 iph = ip_hdr(skb); 1288 id = ntohs(iph->id); 1289 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1290 segs = ERR_PTR(-EPROTONOSUPPORT); 1291 1292 rcu_read_lock(); 1293 ops = rcu_dereference(inet_protos[proto]); 1294 if (likely(ops && ops->gso_segment)) 1295 segs = ops->gso_segment(skb, features); 1296 rcu_read_unlock(); 1297 1298 if (!segs || IS_ERR(segs)) 1299 goto out; 1300 1301 skb = segs; 1302 do { 1303 iph = ip_hdr(skb); 1304 if (proto == IPPROTO_UDP) { 1305 iph->id = htons(id); 1306 iph->frag_off = htons(offset >> 3); 1307 if (skb->next != NULL) 1308 iph->frag_off |= htons(IP_MF); 1309 offset += (skb->len - skb->mac_len - iph->ihl * 4); 1310 } else 1311 iph->id = htons(id++); 1312 iph->tot_len = htons(skb->len - skb->mac_len); 1313 iph->check = 0; 1314 iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl); 1315 } while ((skb = skb->next)); 1316 1317 out: 1318 return segs; 1319 } 1320 1321 static struct sk_buff **inet_gro_receive(struct sk_buff **head, 1322 struct sk_buff *skb) 1323 { 1324 const struct net_protocol *ops; 1325 struct sk_buff **pp = NULL; 1326 struct sk_buff *p; 1327 const struct iphdr *iph; 1328 unsigned int hlen; 1329 unsigned int off; 1330 unsigned int id; 1331 int flush = 1; 1332 int proto; 1333 1334 off = skb_gro_offset(skb); 1335 hlen = off + sizeof(*iph); 1336 iph = skb_gro_header_fast(skb, off); 1337 if (skb_gro_header_hard(skb, hlen)) { 1338 iph = skb_gro_header_slow(skb, hlen, off); 1339 if (unlikely(!iph)) 1340 goto out; 1341 } 1342 1343 proto = iph->protocol & (MAX_INET_PROTOS - 1); 1344 1345 rcu_read_lock(); 1346 ops = rcu_dereference(inet_protos[proto]); 1347 if (!ops || !ops->gro_receive) 1348 goto out_unlock; 1349 1350 if (*(u8 *)iph != 0x45) 1351 goto out_unlock; 1352 1353 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) 1354 goto out_unlock; 1355 1356 id = ntohl(*(__be32 *)&iph->id); 1357 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id ^ IP_DF)); 1358 id >>= 16; 1359 1360 for (p = *head; p; p = p->next) { 1361 struct iphdr *iph2; 1362 1363 if (!NAPI_GRO_CB(p)->same_flow) 1364 continue; 1365 1366 iph2 = ip_hdr(p); 1367 1368 if ((iph->protocol ^ iph2->protocol) | 1369 (iph->tos ^ iph2->tos) | 1370 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) | 1371 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) { 1372 NAPI_GRO_CB(p)->same_flow = 0; 1373 continue; 1374 } 1375 1376 /* All fields must match except length and checksum. */ 1377 NAPI_GRO_CB(p)->flush |= 1378 (iph->ttl ^ iph2->ttl) | 1379 ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id); 1380 1381 NAPI_GRO_CB(p)->flush |= flush; 1382 } 1383 1384 NAPI_GRO_CB(skb)->flush |= flush; 1385 skb_gro_pull(skb, sizeof(*iph)); 1386 skb_set_transport_header(skb, skb_gro_offset(skb)); 1387 1388 pp = ops->gro_receive(head, skb); 1389 1390 out_unlock: 1391 rcu_read_unlock(); 1392 1393 out: 1394 NAPI_GRO_CB(skb)->flush |= flush; 1395 1396 return pp; 1397 } 1398 1399 static int inet_gro_complete(struct sk_buff *skb) 1400 { 1401 const struct net_protocol *ops; 1402 struct iphdr *iph = ip_hdr(skb); 1403 int proto = iph->protocol & (MAX_INET_PROTOS - 1); 1404 int err = -ENOSYS; 1405 __be16 newlen = htons(skb->len - skb_network_offset(skb)); 1406 1407 csum_replace2(&iph->check, iph->tot_len, newlen); 1408 iph->tot_len = newlen; 1409 1410 rcu_read_lock(); 1411 ops = rcu_dereference(inet_protos[proto]); 1412 if (WARN_ON(!ops || !ops->gro_complete)) 1413 goto out_unlock; 1414 1415 err = ops->gro_complete(skb); 1416 1417 out_unlock: 1418 rcu_read_unlock(); 1419 1420 return err; 1421 } 1422 1423 int inet_ctl_sock_create(struct sock **sk, unsigned short family, 1424 unsigned short type, unsigned char protocol, 1425 struct net *net) 1426 { 1427 struct socket *sock; 1428 int rc = sock_create_kern(family, type, protocol, &sock); 1429 1430 if (rc == 0) { 1431 *sk = sock->sk; 1432 (*sk)->sk_allocation = GFP_ATOMIC; 1433 /* 1434 * Unhash it so that IP input processing does not even see it, 1435 * we do not wish this socket to see incoming packets. 1436 */ 1437 (*sk)->sk_prot->unhash(*sk); 1438 1439 sk_change_net(*sk, net); 1440 } 1441 return rc; 1442 } 1443 EXPORT_SYMBOL_GPL(inet_ctl_sock_create); 1444 1445 unsigned long snmp_fold_field(void __percpu *mib[], int offt) 1446 { 1447 unsigned long res = 0; 1448 int i, j; 1449 1450 for_each_possible_cpu(i) { 1451 for (j = 0; j < SNMP_ARRAY_SZ; j++) 1452 res += *(((unsigned long *) per_cpu_ptr(mib[j], i)) + offt); 1453 } 1454 return res; 1455 } 1456 EXPORT_SYMBOL_GPL(snmp_fold_field); 1457 1458 #if BITS_PER_LONG==32 1459 1460 u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t syncp_offset) 1461 { 1462 u64 res = 0; 1463 int cpu; 1464 1465 for_each_possible_cpu(cpu) { 1466 void *bhptr; 1467 struct u64_stats_sync *syncp; 1468 u64 v; 1469 unsigned int start; 1470 1471 bhptr = per_cpu_ptr(mib[0], cpu); 1472 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset); 1473 do { 1474 start = u64_stats_fetch_begin_bh(syncp); 1475 v = *(((u64 *) bhptr) + offt); 1476 } while (u64_stats_fetch_retry_bh(syncp, start)); 1477 1478 res += v; 1479 } 1480 return res; 1481 } 1482 EXPORT_SYMBOL_GPL(snmp_fold_field64); 1483 #endif 1484 1485 int snmp_mib_init(void __percpu *ptr[2], size_t mibsize, size_t align) 1486 { 1487 BUG_ON(ptr == NULL); 1488 ptr[0] = __alloc_percpu(mibsize, align); 1489 if (!ptr[0]) 1490 return -ENOMEM; 1491 #if SNMP_ARRAY_SZ == 2 1492 ptr[1] = __alloc_percpu(mibsize, align); 1493 if (!ptr[1]) { 1494 free_percpu(ptr[0]); 1495 ptr[0] = NULL; 1496 return -ENOMEM; 1497 } 1498 #endif 1499 return 0; 1500 } 1501 EXPORT_SYMBOL_GPL(snmp_mib_init); 1502 1503 void snmp_mib_free(void __percpu *ptr[SNMP_ARRAY_SZ]) 1504 { 1505 int i; 1506 1507 BUG_ON(ptr == NULL); 1508 for (i = 0; i < SNMP_ARRAY_SZ; i++) { 1509 free_percpu(ptr[i]); 1510 ptr[i] = NULL; 1511 } 1512 } 1513 EXPORT_SYMBOL_GPL(snmp_mib_free); 1514 1515 #ifdef CONFIG_IP_MULTICAST 1516 static const struct net_protocol igmp_protocol = { 1517 .handler = igmp_rcv, 1518 .netns_ok = 1, 1519 }; 1520 #endif 1521 1522 static const struct net_protocol tcp_protocol = { 1523 .handler = tcp_v4_rcv, 1524 .err_handler = tcp_v4_err, 1525 .gso_send_check = tcp_v4_gso_send_check, 1526 .gso_segment = tcp_tso_segment, 1527 .gro_receive = tcp4_gro_receive, 1528 .gro_complete = tcp4_gro_complete, 1529 .no_policy = 1, 1530 .netns_ok = 1, 1531 }; 1532 1533 static const struct net_protocol udp_protocol = { 1534 .handler = udp_rcv, 1535 .err_handler = udp_err, 1536 .gso_send_check = udp4_ufo_send_check, 1537 .gso_segment = udp4_ufo_fragment, 1538 .no_policy = 1, 1539 .netns_ok = 1, 1540 }; 1541 1542 static const struct net_protocol icmp_protocol = { 1543 .handler = icmp_rcv, 1544 .err_handler = ping_err, 1545 .no_policy = 1, 1546 .netns_ok = 1, 1547 }; 1548 1549 static __net_init int ipv4_mib_init_net(struct net *net) 1550 { 1551 if (snmp_mib_init((void __percpu **)net->mib.tcp_statistics, 1552 sizeof(struct tcp_mib), 1553 __alignof__(struct tcp_mib)) < 0) 1554 goto err_tcp_mib; 1555 if (snmp_mib_init((void __percpu **)net->mib.ip_statistics, 1556 sizeof(struct ipstats_mib), 1557 __alignof__(struct ipstats_mib)) < 0) 1558 goto err_ip_mib; 1559 if (snmp_mib_init((void __percpu **)net->mib.net_statistics, 1560 sizeof(struct linux_mib), 1561 __alignof__(struct linux_mib)) < 0) 1562 goto err_net_mib; 1563 if (snmp_mib_init((void __percpu **)net->mib.udp_statistics, 1564 sizeof(struct udp_mib), 1565 __alignof__(struct udp_mib)) < 0) 1566 goto err_udp_mib; 1567 if (snmp_mib_init((void __percpu **)net->mib.udplite_statistics, 1568 sizeof(struct udp_mib), 1569 __alignof__(struct udp_mib)) < 0) 1570 goto err_udplite_mib; 1571 if (snmp_mib_init((void __percpu **)net->mib.icmp_statistics, 1572 sizeof(struct icmp_mib), 1573 __alignof__(struct icmp_mib)) < 0) 1574 goto err_icmp_mib; 1575 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib), 1576 GFP_KERNEL); 1577 if (!net->mib.icmpmsg_statistics) 1578 goto err_icmpmsg_mib; 1579 1580 tcp_mib_init(net); 1581 return 0; 1582 1583 err_icmpmsg_mib: 1584 snmp_mib_free((void __percpu **)net->mib.icmp_statistics); 1585 err_icmp_mib: 1586 snmp_mib_free((void __percpu **)net->mib.udplite_statistics); 1587 err_udplite_mib: 1588 snmp_mib_free((void __percpu **)net->mib.udp_statistics); 1589 err_udp_mib: 1590 snmp_mib_free((void __percpu **)net->mib.net_statistics); 1591 err_net_mib: 1592 snmp_mib_free((void __percpu **)net->mib.ip_statistics); 1593 err_ip_mib: 1594 snmp_mib_free((void __percpu **)net->mib.tcp_statistics); 1595 err_tcp_mib: 1596 return -ENOMEM; 1597 } 1598 1599 static __net_exit void ipv4_mib_exit_net(struct net *net) 1600 { 1601 kfree(net->mib.icmpmsg_statistics); 1602 snmp_mib_free((void __percpu **)net->mib.icmp_statistics); 1603 snmp_mib_free((void __percpu **)net->mib.udplite_statistics); 1604 snmp_mib_free((void __percpu **)net->mib.udp_statistics); 1605 snmp_mib_free((void __percpu **)net->mib.net_statistics); 1606 snmp_mib_free((void __percpu **)net->mib.ip_statistics); 1607 snmp_mib_free((void __percpu **)net->mib.tcp_statistics); 1608 } 1609 1610 static __net_initdata struct pernet_operations ipv4_mib_ops = { 1611 .init = ipv4_mib_init_net, 1612 .exit = ipv4_mib_exit_net, 1613 }; 1614 1615 static int __init init_ipv4_mibs(void) 1616 { 1617 return register_pernet_subsys(&ipv4_mib_ops); 1618 } 1619 1620 static int ipv4_proc_init(void); 1621 1622 /* 1623 * IP protocol layer initialiser 1624 */ 1625 1626 static struct packet_type ip_packet_type __read_mostly = { 1627 .type = cpu_to_be16(ETH_P_IP), 1628 .func = ip_rcv, 1629 .gso_send_check = inet_gso_send_check, 1630 .gso_segment = inet_gso_segment, 1631 .gro_receive = inet_gro_receive, 1632 .gro_complete = inet_gro_complete, 1633 }; 1634 1635 static int __init inet_init(void) 1636 { 1637 struct sk_buff *dummy_skb; 1638 struct inet_protosw *q; 1639 struct list_head *r; 1640 int rc = -EINVAL; 1641 1642 BUILD_BUG_ON(sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb)); 1643 1644 sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL); 1645 if (!sysctl_local_reserved_ports) 1646 goto out; 1647 1648 rc = proto_register(&tcp_prot, 1); 1649 if (rc) 1650 goto out_free_reserved_ports; 1651 1652 rc = proto_register(&udp_prot, 1); 1653 if (rc) 1654 goto out_unregister_tcp_proto; 1655 1656 rc = proto_register(&raw_prot, 1); 1657 if (rc) 1658 goto out_unregister_udp_proto; 1659 1660 rc = proto_register(&ping_prot, 1); 1661 if (rc) 1662 goto out_unregister_raw_proto; 1663 1664 /* 1665 * Tell SOCKET that we are alive... 1666 */ 1667 1668 (void)sock_register(&inet_family_ops); 1669 1670 #ifdef CONFIG_SYSCTL 1671 ip_static_sysctl_init(); 1672 #endif 1673 1674 tcp_prot.sysctl_mem = init_net.ipv4.sysctl_tcp_mem; 1675 1676 /* 1677 * Add all the base protocols. 1678 */ 1679 1680 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 1681 pr_crit("%s: Cannot add ICMP protocol\n", __func__); 1682 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) 1683 pr_crit("%s: Cannot add UDP protocol\n", __func__); 1684 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) 1685 pr_crit("%s: Cannot add TCP protocol\n", __func__); 1686 #ifdef CONFIG_IP_MULTICAST 1687 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 1688 pr_crit("%s: Cannot add IGMP protocol\n", __func__); 1689 #endif 1690 1691 /* Register the socket-side information for inet_create. */ 1692 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 1693 INIT_LIST_HEAD(r); 1694 1695 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 1696 inet_register_protosw(q); 1697 1698 /* 1699 * Set the ARP module up 1700 */ 1701 1702 arp_init(); 1703 1704 /* 1705 * Set the IP module up 1706 */ 1707 1708 ip_init(); 1709 1710 tcp_v4_init(); 1711 1712 /* Setup TCP slab cache for open requests. */ 1713 tcp_init(); 1714 1715 /* Setup UDP memory threshold */ 1716 udp_init(); 1717 1718 /* Add UDP-Lite (RFC 3828) */ 1719 udplite4_register(); 1720 1721 ping_init(); 1722 1723 /* 1724 * Set the ICMP layer up 1725 */ 1726 1727 if (icmp_init() < 0) 1728 panic("Failed to create the ICMP control socket.\n"); 1729 1730 /* 1731 * Initialise the multicast router 1732 */ 1733 #if defined(CONFIG_IP_MROUTE) 1734 if (ip_mr_init()) 1735 pr_crit("%s: Cannot init ipv4 mroute\n", __func__); 1736 #endif 1737 /* 1738 * Initialise per-cpu ipv4 mibs 1739 */ 1740 1741 if (init_ipv4_mibs()) 1742 pr_crit("%s: Cannot init ipv4 mibs\n", __func__); 1743 1744 ipv4_proc_init(); 1745 1746 ipfrag_init(); 1747 1748 dev_add_pack(&ip_packet_type); 1749 1750 rc = 0; 1751 out: 1752 return rc; 1753 out_unregister_raw_proto: 1754 proto_unregister(&raw_prot); 1755 out_unregister_udp_proto: 1756 proto_unregister(&udp_prot); 1757 out_unregister_tcp_proto: 1758 proto_unregister(&tcp_prot); 1759 out_free_reserved_ports: 1760 kfree(sysctl_local_reserved_ports); 1761 goto out; 1762 } 1763 1764 fs_initcall(inet_init); 1765 1766 /* ------------------------------------------------------------------------ */ 1767 1768 #ifdef CONFIG_PROC_FS 1769 static int __init ipv4_proc_init(void) 1770 { 1771 int rc = 0; 1772 1773 if (raw_proc_init()) 1774 goto out_raw; 1775 if (tcp4_proc_init()) 1776 goto out_tcp; 1777 if (udp4_proc_init()) 1778 goto out_udp; 1779 if (ping_proc_init()) 1780 goto out_ping; 1781 if (ip_misc_proc_init()) 1782 goto out_misc; 1783 out: 1784 return rc; 1785 out_misc: 1786 ping_proc_exit(); 1787 out_ping: 1788 udp4_proc_exit(); 1789 out_udp: 1790 tcp4_proc_exit(); 1791 out_tcp: 1792 raw_proc_exit(); 1793 out_raw: 1794 rc = -ENOMEM; 1795 goto out; 1796 } 1797 1798 #else /* CONFIG_PROC_FS */ 1799 static int __init ipv4_proc_init(void) 1800 { 1801 return 0; 1802 } 1803 #endif /* CONFIG_PROC_FS */ 1804 1805 MODULE_ALIAS_NETPROTO(PF_INET); 1806 1807