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/inet_common.h> 115 #include <net/xfrm.h> 116 #include <net/net_namespace.h> 117 #include <net/secure_seq.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 /* New destruction routine */ 130 131 void inet_sock_destruct(struct sock *sk) 132 { 133 struct inet_sock *inet = inet_sk(sk); 134 135 __skb_queue_purge(&sk->sk_receive_queue); 136 __skb_queue_purge(&sk->sk_error_queue); 137 138 sk_mem_reclaim(sk); 139 140 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) { 141 pr_err("Attempt to release TCP socket in state %d %p\n", 142 sk->sk_state, sk); 143 return; 144 } 145 if (!sock_flag(sk, SOCK_DEAD)) { 146 pr_err("Attempt to release alive inet socket %p\n", sk); 147 return; 148 } 149 150 WARN_ON(atomic_read(&sk->sk_rmem_alloc)); 151 WARN_ON(atomic_read(&sk->sk_wmem_alloc)); 152 WARN_ON(sk->sk_wmem_queued); 153 WARN_ON(sk->sk_forward_alloc); 154 155 kfree(rcu_dereference_protected(inet->inet_opt, 1)); 156 dst_release(rcu_dereference_check(sk->sk_dst_cache, 1)); 157 dst_release(sk->sk_rx_dst); 158 sk_refcnt_debug_dec(sk); 159 } 160 EXPORT_SYMBOL(inet_sock_destruct); 161 162 /* 163 * The routines beyond this point handle the behaviour of an AF_INET 164 * socket object. Mostly it punts to the subprotocols of IP to do 165 * the work. 166 */ 167 168 /* 169 * Automatically bind an unbound socket. 170 */ 171 172 static int inet_autobind(struct sock *sk) 173 { 174 struct inet_sock *inet; 175 /* We may need to bind the socket. */ 176 lock_sock(sk); 177 inet = inet_sk(sk); 178 if (!inet->inet_num) { 179 if (sk->sk_prot->get_port(sk, 0)) { 180 release_sock(sk); 181 return -EAGAIN; 182 } 183 inet->inet_sport = htons(inet->inet_num); 184 } 185 release_sock(sk); 186 return 0; 187 } 188 189 /* 190 * Move a socket into listening state. 191 */ 192 int inet_listen(struct socket *sock, int backlog) 193 { 194 struct sock *sk = sock->sk; 195 unsigned char old_state; 196 int err; 197 198 lock_sock(sk); 199 200 err = -EINVAL; 201 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM) 202 goto out; 203 204 old_state = sk->sk_state; 205 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN))) 206 goto out; 207 208 /* Really, if the socket is already in listen state 209 * we can only allow the backlog to be adjusted. 210 */ 211 if (old_state != TCP_LISTEN) { 212 /* Check special setups for testing purpose to enable TFO w/o 213 * requiring TCP_FASTOPEN sockopt. 214 * Note that only TCP sockets (SOCK_STREAM) will reach here. 215 * Also fastopenq may already been allocated because this 216 * socket was in TCP_LISTEN state previously but was 217 * shutdown() (rather than close()). 218 */ 219 if ((sysctl_tcp_fastopen & TFO_SERVER_ENABLE) != 0 && 220 inet_csk(sk)->icsk_accept_queue.fastopenq == NULL) { 221 if ((sysctl_tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) != 0) 222 err = fastopen_init_queue(sk, backlog); 223 else if ((sysctl_tcp_fastopen & 224 TFO_SERVER_WO_SOCKOPT2) != 0) 225 err = fastopen_init_queue(sk, 226 ((uint)sysctl_tcp_fastopen) >> 16); 227 else 228 err = 0; 229 if (err) 230 goto out; 231 } 232 err = inet_csk_listen_start(sk, backlog); 233 if (err) 234 goto out; 235 } 236 sk->sk_max_ack_backlog = backlog; 237 err = 0; 238 239 out: 240 release_sock(sk); 241 return err; 242 } 243 EXPORT_SYMBOL(inet_listen); 244 245 /* 246 * Create an inet socket. 247 */ 248 249 static int inet_create(struct net *net, struct socket *sock, int protocol, 250 int kern) 251 { 252 struct sock *sk; 253 struct inet_protosw *answer; 254 struct inet_sock *inet; 255 struct proto *answer_prot; 256 unsigned char answer_flags; 257 char answer_no_check; 258 int try_loading_module = 0; 259 int err; 260 261 sock->state = SS_UNCONNECTED; 262 263 /* Look for the requested type/protocol pair. */ 264 lookup_protocol: 265 err = -ESOCKTNOSUPPORT; 266 rcu_read_lock(); 267 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) { 268 269 err = 0; 270 /* Check the non-wild match. */ 271 if (protocol == answer->protocol) { 272 if (protocol != IPPROTO_IP) 273 break; 274 } else { 275 /* Check for the two wild cases. */ 276 if (IPPROTO_IP == protocol) { 277 protocol = answer->protocol; 278 break; 279 } 280 if (IPPROTO_IP == answer->protocol) 281 break; 282 } 283 err = -EPROTONOSUPPORT; 284 } 285 286 if (unlikely(err)) { 287 if (try_loading_module < 2) { 288 rcu_read_unlock(); 289 /* 290 * Be more specific, e.g. net-pf-2-proto-132-type-1 291 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) 292 */ 293 if (++try_loading_module == 1) 294 request_module("net-pf-%d-proto-%d-type-%d", 295 PF_INET, protocol, sock->type); 296 /* 297 * Fall back to generic, e.g. net-pf-2-proto-132 298 * (net-pf-PF_INET-proto-IPPROTO_SCTP) 299 */ 300 else 301 request_module("net-pf-%d-proto-%d", 302 PF_INET, protocol); 303 goto lookup_protocol; 304 } else 305 goto out_rcu_unlock; 306 } 307 308 err = -EPERM; 309 if (sock->type == SOCK_RAW && !kern && 310 !ns_capable(net->user_ns, CAP_NET_RAW)) 311 goto out_rcu_unlock; 312 313 sock->ops = answer->ops; 314 answer_prot = answer->prot; 315 answer_no_check = answer->no_check; 316 answer_flags = answer->flags; 317 rcu_read_unlock(); 318 319 WARN_ON(answer_prot->slab == NULL); 320 321 err = -ENOBUFS; 322 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot); 323 if (sk == NULL) 324 goto out; 325 326 err = 0; 327 sk->sk_no_check = answer_no_check; 328 if (INET_PROTOSW_REUSE & answer_flags) 329 sk->sk_reuse = SK_CAN_REUSE; 330 331 inet = inet_sk(sk); 332 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 333 334 inet->nodefrag = 0; 335 336 if (SOCK_RAW == sock->type) { 337 inet->inet_num = protocol; 338 if (IPPROTO_RAW == protocol) 339 inet->hdrincl = 1; 340 } 341 342 if (net->ipv4.sysctl_ip_no_pmtu_disc) 343 inet->pmtudisc = IP_PMTUDISC_DONT; 344 else 345 inet->pmtudisc = IP_PMTUDISC_WANT; 346 347 inet->inet_id = 0; 348 349 sock_init_data(sock, sk); 350 351 sk->sk_destruct = inet_sock_destruct; 352 sk->sk_protocol = protocol; 353 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 354 355 inet->uc_ttl = -1; 356 inet->mc_loop = 1; 357 inet->mc_ttl = 1; 358 inet->mc_all = 1; 359 inet->mc_index = 0; 360 inet->mc_list = NULL; 361 inet->rcv_tos = 0; 362 363 sk_refcnt_debug_inc(sk); 364 365 if (inet->inet_num) { 366 /* It assumes that any protocol which allows 367 * the user to assign a number at socket 368 * creation time automatically 369 * shares. 370 */ 371 inet->inet_sport = htons(inet->inet_num); 372 /* Add to protocol hash chains. */ 373 sk->sk_prot->hash(sk); 374 } 375 376 if (sk->sk_prot->init) { 377 err = sk->sk_prot->init(sk); 378 if (err) 379 sk_common_release(sk); 380 } 381 out: 382 return err; 383 out_rcu_unlock: 384 rcu_read_unlock(); 385 goto out; 386 } 387 388 389 /* 390 * The peer socket should always be NULL (or else). When we call this 391 * function we are destroying the object and from then on nobody 392 * should refer to it. 393 */ 394 int inet_release(struct socket *sock) 395 { 396 struct sock *sk = sock->sk; 397 398 if (sk) { 399 long timeout; 400 401 sock_rps_reset_flow(sk); 402 403 /* Applications forget to leave groups before exiting */ 404 ip_mc_drop_socket(sk); 405 406 /* If linger is set, we don't return until the close 407 * is complete. Otherwise we return immediately. The 408 * actually closing is done the same either way. 409 * 410 * If the close is due to the process exiting, we never 411 * linger.. 412 */ 413 timeout = 0; 414 if (sock_flag(sk, SOCK_LINGER) && 415 !(current->flags & PF_EXITING)) 416 timeout = sk->sk_lingertime; 417 sock->sk = NULL; 418 sk->sk_prot->close(sk, timeout); 419 } 420 return 0; 421 } 422 EXPORT_SYMBOL(inet_release); 423 424 /* It is off by default, see below. */ 425 int sysctl_ip_nonlocal_bind __read_mostly; 426 EXPORT_SYMBOL(sysctl_ip_nonlocal_bind); 427 428 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 429 { 430 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 431 struct sock *sk = sock->sk; 432 struct inet_sock *inet = inet_sk(sk); 433 struct net *net = sock_net(sk); 434 unsigned short snum; 435 int chk_addr_ret; 436 int err; 437 438 /* If the socket has its own bind function then use it. (RAW) */ 439 if (sk->sk_prot->bind) { 440 err = sk->sk_prot->bind(sk, uaddr, addr_len); 441 goto out; 442 } 443 err = -EINVAL; 444 if (addr_len < sizeof(struct sockaddr_in)) 445 goto out; 446 447 if (addr->sin_family != AF_INET) { 448 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET) 449 * only if s_addr is INADDR_ANY. 450 */ 451 err = -EAFNOSUPPORT; 452 if (addr->sin_family != AF_UNSPEC || 453 addr->sin_addr.s_addr != htonl(INADDR_ANY)) 454 goto out; 455 } 456 457 chk_addr_ret = inet_addr_type(net, addr->sin_addr.s_addr); 458 459 /* Not specified by any standard per-se, however it breaks too 460 * many applications when removed. It is unfortunate since 461 * allowing applications to make a non-local bind solves 462 * several problems with systems using dynamic addressing. 463 * (ie. your servers still start up even if your ISDN link 464 * is temporarily down) 465 */ 466 err = -EADDRNOTAVAIL; 467 if (!sysctl_ip_nonlocal_bind && 468 !(inet->freebind || inet->transparent) && 469 addr->sin_addr.s_addr != htonl(INADDR_ANY) && 470 chk_addr_ret != RTN_LOCAL && 471 chk_addr_ret != RTN_MULTICAST && 472 chk_addr_ret != RTN_BROADCAST) 473 goto out; 474 475 snum = ntohs(addr->sin_port); 476 err = -EACCES; 477 if (snum && snum < PROT_SOCK && 478 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 479 goto out; 480 481 /* We keep a pair of addresses. rcv_saddr is the one 482 * used by hash lookups, and saddr is used for transmit. 483 * 484 * In the BSD API these are the same except where it 485 * would be illegal to use them (multicast/broadcast) in 486 * which case the sending device address is used. 487 */ 488 lock_sock(sk); 489 490 /* Check these errors (active socket, double bind). */ 491 err = -EINVAL; 492 if (sk->sk_state != TCP_CLOSE || inet->inet_num) 493 goto out_release_sock; 494 495 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 496 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 497 inet->inet_saddr = 0; /* Use device */ 498 499 /* Make sure we are allowed to bind here. */ 500 if (sk->sk_prot->get_port(sk, snum)) { 501 inet->inet_saddr = inet->inet_rcv_saddr = 0; 502 err = -EADDRINUSE; 503 goto out_release_sock; 504 } 505 506 if (inet->inet_rcv_saddr) 507 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 508 if (snum) 509 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 510 inet->inet_sport = htons(inet->inet_num); 511 inet->inet_daddr = 0; 512 inet->inet_dport = 0; 513 sk_dst_reset(sk); 514 err = 0; 515 out_release_sock: 516 release_sock(sk); 517 out: 518 return err; 519 } 520 EXPORT_SYMBOL(inet_bind); 521 522 int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr, 523 int addr_len, int flags) 524 { 525 struct sock *sk = sock->sk; 526 527 if (addr_len < sizeof(uaddr->sa_family)) 528 return -EINVAL; 529 if (uaddr->sa_family == AF_UNSPEC) 530 return sk->sk_prot->disconnect(sk, flags); 531 532 if (!inet_sk(sk)->inet_num && inet_autobind(sk)) 533 return -EAGAIN; 534 return sk->sk_prot->connect(sk, uaddr, addr_len); 535 } 536 EXPORT_SYMBOL(inet_dgram_connect); 537 538 static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias) 539 { 540 DEFINE_WAIT(wait); 541 542 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 543 sk->sk_write_pending += writebias; 544 545 /* Basic assumption: if someone sets sk->sk_err, he _must_ 546 * change state of the socket from TCP_SYN_*. 547 * Connect() does not allow to get error notifications 548 * without closing the socket. 549 */ 550 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 551 release_sock(sk); 552 timeo = schedule_timeout(timeo); 553 lock_sock(sk); 554 if (signal_pending(current) || !timeo) 555 break; 556 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 557 } 558 finish_wait(sk_sleep(sk), &wait); 559 sk->sk_write_pending -= writebias; 560 return timeo; 561 } 562 563 /* 564 * Connect to a remote host. There is regrettably still a little 565 * TCP 'magic' in here. 566 */ 567 int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 568 int addr_len, int flags) 569 { 570 struct sock *sk = sock->sk; 571 int err; 572 long timeo; 573 574 if (addr_len < sizeof(uaddr->sa_family)) 575 return -EINVAL; 576 577 if (uaddr->sa_family == AF_UNSPEC) { 578 err = sk->sk_prot->disconnect(sk, flags); 579 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 580 goto out; 581 } 582 583 switch (sock->state) { 584 default: 585 err = -EINVAL; 586 goto out; 587 case SS_CONNECTED: 588 err = -EISCONN; 589 goto out; 590 case SS_CONNECTING: 591 err = -EALREADY; 592 /* Fall out of switch with err, set for this state */ 593 break; 594 case SS_UNCONNECTED: 595 err = -EISCONN; 596 if (sk->sk_state != TCP_CLOSE) 597 goto out; 598 599 err = sk->sk_prot->connect(sk, uaddr, addr_len); 600 if (err < 0) 601 goto out; 602 603 sock->state = SS_CONNECTING; 604 605 /* Just entered SS_CONNECTING state; the only 606 * difference is that return value in non-blocking 607 * case is EINPROGRESS, rather than EALREADY. 608 */ 609 err = -EINPROGRESS; 610 break; 611 } 612 613 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 614 615 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 616 int writebias = (sk->sk_protocol == IPPROTO_TCP) && 617 tcp_sk(sk)->fastopen_req && 618 tcp_sk(sk)->fastopen_req->data ? 1 : 0; 619 620 /* Error code is set above */ 621 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias)) 622 goto out; 623 624 err = sock_intr_errno(timeo); 625 if (signal_pending(current)) 626 goto out; 627 } 628 629 /* Connection was closed by RST, timeout, ICMP error 630 * or another process disconnected us. 631 */ 632 if (sk->sk_state == TCP_CLOSE) 633 goto sock_error; 634 635 /* sk->sk_err may be not zero now, if RECVERR was ordered by user 636 * and error was received after socket entered established state. 637 * Hence, it is handled normally after connect() return successfully. 638 */ 639 640 sock->state = SS_CONNECTED; 641 err = 0; 642 out: 643 return err; 644 645 sock_error: 646 err = sock_error(sk) ? : -ECONNABORTED; 647 sock->state = SS_UNCONNECTED; 648 if (sk->sk_prot->disconnect(sk, flags)) 649 sock->state = SS_DISCONNECTING; 650 goto out; 651 } 652 EXPORT_SYMBOL(__inet_stream_connect); 653 654 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 655 int addr_len, int flags) 656 { 657 int err; 658 659 lock_sock(sock->sk); 660 err = __inet_stream_connect(sock, uaddr, addr_len, flags); 661 release_sock(sock->sk); 662 return err; 663 } 664 EXPORT_SYMBOL(inet_stream_connect); 665 666 /* 667 * Accept a pending connection. The TCP layer now gives BSD semantics. 668 */ 669 670 int inet_accept(struct socket *sock, struct socket *newsock, int flags) 671 { 672 struct sock *sk1 = sock->sk; 673 int err = -EINVAL; 674 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err); 675 676 if (!sk2) 677 goto do_err; 678 679 lock_sock(sk2); 680 681 sock_rps_record_flow(sk2); 682 WARN_ON(!((1 << sk2->sk_state) & 683 (TCPF_ESTABLISHED | TCPF_SYN_RECV | 684 TCPF_CLOSE_WAIT | TCPF_CLOSE))); 685 686 sock_graft(sk2, newsock); 687 688 newsock->state = SS_CONNECTED; 689 err = 0; 690 release_sock(sk2); 691 do_err: 692 return err; 693 } 694 EXPORT_SYMBOL(inet_accept); 695 696 697 /* 698 * This does both peername and sockname. 699 */ 700 int inet_getname(struct socket *sock, struct sockaddr *uaddr, 701 int *uaddr_len, int peer) 702 { 703 struct sock *sk = sock->sk; 704 struct inet_sock *inet = inet_sk(sk); 705 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr); 706 707 sin->sin_family = AF_INET; 708 if (peer) { 709 if (!inet->inet_dport || 710 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 711 peer == 1)) 712 return -ENOTCONN; 713 sin->sin_port = inet->inet_dport; 714 sin->sin_addr.s_addr = inet->inet_daddr; 715 } else { 716 __be32 addr = inet->inet_rcv_saddr; 717 if (!addr) 718 addr = inet->inet_saddr; 719 sin->sin_port = inet->inet_sport; 720 sin->sin_addr.s_addr = addr; 721 } 722 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 723 *uaddr_len = sizeof(*sin); 724 return 0; 725 } 726 EXPORT_SYMBOL(inet_getname); 727 728 int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 729 size_t size) 730 { 731 struct sock *sk = sock->sk; 732 733 sock_rps_record_flow(sk); 734 735 /* We may need to bind the socket. */ 736 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 737 inet_autobind(sk)) 738 return -EAGAIN; 739 740 return sk->sk_prot->sendmsg(iocb, sk, msg, size); 741 } 742 EXPORT_SYMBOL(inet_sendmsg); 743 744 ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, 745 size_t size, int flags) 746 { 747 struct sock *sk = sock->sk; 748 749 sock_rps_record_flow(sk); 750 751 /* We may need to bind the socket. */ 752 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 753 inet_autobind(sk)) 754 return -EAGAIN; 755 756 if (sk->sk_prot->sendpage) 757 return sk->sk_prot->sendpage(sk, page, offset, size, flags); 758 return sock_no_sendpage(sock, page, offset, size, flags); 759 } 760 EXPORT_SYMBOL(inet_sendpage); 761 762 int inet_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 763 size_t size, int flags) 764 { 765 struct sock *sk = sock->sk; 766 int addr_len = 0; 767 int err; 768 769 sock_rps_record_flow(sk); 770 771 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, 772 flags & ~MSG_DONTWAIT, &addr_len); 773 if (err >= 0) 774 msg->msg_namelen = addr_len; 775 return err; 776 } 777 EXPORT_SYMBOL(inet_recvmsg); 778 779 int inet_shutdown(struct socket *sock, int how) 780 { 781 struct sock *sk = sock->sk; 782 int err = 0; 783 784 /* This should really check to make sure 785 * the socket is a TCP socket. (WHY AC...) 786 */ 787 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and 788 1->2 bit 2 snds. 789 2->3 */ 790 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ 791 return -EINVAL; 792 793 lock_sock(sk); 794 if (sock->state == SS_CONNECTING) { 795 if ((1 << sk->sk_state) & 796 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) 797 sock->state = SS_DISCONNECTING; 798 else 799 sock->state = SS_CONNECTED; 800 } 801 802 switch (sk->sk_state) { 803 case TCP_CLOSE: 804 err = -ENOTCONN; 805 /* Hack to wake up other listeners, who can poll for 806 POLLHUP, even on eg. unconnected UDP sockets -- RR */ 807 default: 808 sk->sk_shutdown |= how; 809 if (sk->sk_prot->shutdown) 810 sk->sk_prot->shutdown(sk, how); 811 break; 812 813 /* Remaining two branches are temporary solution for missing 814 * close() in multithreaded environment. It is _not_ a good idea, 815 * but we have no choice until close() is repaired at VFS level. 816 */ 817 case TCP_LISTEN: 818 if (!(how & RCV_SHUTDOWN)) 819 break; 820 /* Fall through */ 821 case TCP_SYN_SENT: 822 err = sk->sk_prot->disconnect(sk, O_NONBLOCK); 823 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 824 break; 825 } 826 827 /* Wake up anyone sleeping in poll. */ 828 sk->sk_state_change(sk); 829 release_sock(sk); 830 return err; 831 } 832 EXPORT_SYMBOL(inet_shutdown); 833 834 /* 835 * ioctl() calls you can issue on an INET socket. Most of these are 836 * device configuration and stuff and very rarely used. Some ioctls 837 * pass on to the socket itself. 838 * 839 * NOTE: I like the idea of a module for the config stuff. ie ifconfig 840 * loads the devconfigure module does its configuring and unloads it. 841 * There's a good 20K of config code hanging around the kernel. 842 */ 843 844 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 845 { 846 struct sock *sk = sock->sk; 847 int err = 0; 848 struct net *net = sock_net(sk); 849 850 switch (cmd) { 851 case SIOCGSTAMP: 852 err = sock_get_timestamp(sk, (struct timeval __user *)arg); 853 break; 854 case SIOCGSTAMPNS: 855 err = sock_get_timestampns(sk, (struct timespec __user *)arg); 856 break; 857 case SIOCADDRT: 858 case SIOCDELRT: 859 case SIOCRTMSG: 860 err = ip_rt_ioctl(net, cmd, (void __user *)arg); 861 break; 862 case SIOCDARP: 863 case SIOCGARP: 864 case SIOCSARP: 865 err = arp_ioctl(net, cmd, (void __user *)arg); 866 break; 867 case SIOCGIFADDR: 868 case SIOCSIFADDR: 869 case SIOCGIFBRDADDR: 870 case SIOCSIFBRDADDR: 871 case SIOCGIFNETMASK: 872 case SIOCSIFNETMASK: 873 case SIOCGIFDSTADDR: 874 case SIOCSIFDSTADDR: 875 case SIOCSIFPFLAGS: 876 case SIOCGIFPFLAGS: 877 case SIOCSIFFLAGS: 878 err = devinet_ioctl(net, cmd, (void __user *)arg); 879 break; 880 default: 881 if (sk->sk_prot->ioctl) 882 err = sk->sk_prot->ioctl(sk, cmd, arg); 883 else 884 err = -ENOIOCTLCMD; 885 break; 886 } 887 return err; 888 } 889 EXPORT_SYMBOL(inet_ioctl); 890 891 #ifdef CONFIG_COMPAT 892 static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 893 { 894 struct sock *sk = sock->sk; 895 int err = -ENOIOCTLCMD; 896 897 if (sk->sk_prot->compat_ioctl) 898 err = sk->sk_prot->compat_ioctl(sk, cmd, arg); 899 900 return err; 901 } 902 #endif 903 904 const struct proto_ops inet_stream_ops = { 905 .family = PF_INET, 906 .owner = THIS_MODULE, 907 .release = inet_release, 908 .bind = inet_bind, 909 .connect = inet_stream_connect, 910 .socketpair = sock_no_socketpair, 911 .accept = inet_accept, 912 .getname = inet_getname, 913 .poll = tcp_poll, 914 .ioctl = inet_ioctl, 915 .listen = inet_listen, 916 .shutdown = inet_shutdown, 917 .setsockopt = sock_common_setsockopt, 918 .getsockopt = sock_common_getsockopt, 919 .sendmsg = inet_sendmsg, 920 .recvmsg = inet_recvmsg, 921 .mmap = sock_no_mmap, 922 .sendpage = inet_sendpage, 923 .splice_read = tcp_splice_read, 924 #ifdef CONFIG_COMPAT 925 .compat_setsockopt = compat_sock_common_setsockopt, 926 .compat_getsockopt = compat_sock_common_getsockopt, 927 .compat_ioctl = inet_compat_ioctl, 928 #endif 929 }; 930 EXPORT_SYMBOL(inet_stream_ops); 931 932 const struct proto_ops inet_dgram_ops = { 933 .family = PF_INET, 934 .owner = THIS_MODULE, 935 .release = inet_release, 936 .bind = inet_bind, 937 .connect = inet_dgram_connect, 938 .socketpair = sock_no_socketpair, 939 .accept = sock_no_accept, 940 .getname = inet_getname, 941 .poll = udp_poll, 942 .ioctl = inet_ioctl, 943 .listen = sock_no_listen, 944 .shutdown = inet_shutdown, 945 .setsockopt = sock_common_setsockopt, 946 .getsockopt = sock_common_getsockopt, 947 .sendmsg = inet_sendmsg, 948 .recvmsg = inet_recvmsg, 949 .mmap = sock_no_mmap, 950 .sendpage = inet_sendpage, 951 #ifdef CONFIG_COMPAT 952 .compat_setsockopt = compat_sock_common_setsockopt, 953 .compat_getsockopt = compat_sock_common_getsockopt, 954 .compat_ioctl = inet_compat_ioctl, 955 #endif 956 }; 957 EXPORT_SYMBOL(inet_dgram_ops); 958 959 /* 960 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 961 * udp_poll 962 */ 963 static const struct proto_ops inet_sockraw_ops = { 964 .family = PF_INET, 965 .owner = THIS_MODULE, 966 .release = inet_release, 967 .bind = inet_bind, 968 .connect = inet_dgram_connect, 969 .socketpair = sock_no_socketpair, 970 .accept = sock_no_accept, 971 .getname = inet_getname, 972 .poll = datagram_poll, 973 .ioctl = inet_ioctl, 974 .listen = sock_no_listen, 975 .shutdown = inet_shutdown, 976 .setsockopt = sock_common_setsockopt, 977 .getsockopt = sock_common_getsockopt, 978 .sendmsg = inet_sendmsg, 979 .recvmsg = inet_recvmsg, 980 .mmap = sock_no_mmap, 981 .sendpage = inet_sendpage, 982 #ifdef CONFIG_COMPAT 983 .compat_setsockopt = compat_sock_common_setsockopt, 984 .compat_getsockopt = compat_sock_common_getsockopt, 985 .compat_ioctl = inet_compat_ioctl, 986 #endif 987 }; 988 989 static const struct net_proto_family inet_family_ops = { 990 .family = PF_INET, 991 .create = inet_create, 992 .owner = THIS_MODULE, 993 }; 994 995 /* Upon startup we insert all the elements in inetsw_array[] into 996 * the linked list inetsw. 997 */ 998 static struct inet_protosw inetsw_array[] = 999 { 1000 { 1001 .type = SOCK_STREAM, 1002 .protocol = IPPROTO_TCP, 1003 .prot = &tcp_prot, 1004 .ops = &inet_stream_ops, 1005 .no_check = 0, 1006 .flags = INET_PROTOSW_PERMANENT | 1007 INET_PROTOSW_ICSK, 1008 }, 1009 1010 { 1011 .type = SOCK_DGRAM, 1012 .protocol = IPPROTO_UDP, 1013 .prot = &udp_prot, 1014 .ops = &inet_dgram_ops, 1015 .no_check = UDP_CSUM_DEFAULT, 1016 .flags = INET_PROTOSW_PERMANENT, 1017 }, 1018 1019 { 1020 .type = SOCK_DGRAM, 1021 .protocol = IPPROTO_ICMP, 1022 .prot = &ping_prot, 1023 .ops = &inet_dgram_ops, 1024 .no_check = UDP_CSUM_DEFAULT, 1025 .flags = INET_PROTOSW_REUSE, 1026 }, 1027 1028 { 1029 .type = SOCK_RAW, 1030 .protocol = IPPROTO_IP, /* wild card */ 1031 .prot = &raw_prot, 1032 .ops = &inet_sockraw_ops, 1033 .no_check = UDP_CSUM_DEFAULT, 1034 .flags = INET_PROTOSW_REUSE, 1035 } 1036 }; 1037 1038 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) 1039 1040 void inet_register_protosw(struct inet_protosw *p) 1041 { 1042 struct list_head *lh; 1043 struct inet_protosw *answer; 1044 int protocol = p->protocol; 1045 struct list_head *last_perm; 1046 1047 spin_lock_bh(&inetsw_lock); 1048 1049 if (p->type >= SOCK_MAX) 1050 goto out_illegal; 1051 1052 /* If we are trying to override a permanent protocol, bail. */ 1053 answer = NULL; 1054 last_perm = &inetsw[p->type]; 1055 list_for_each(lh, &inetsw[p->type]) { 1056 answer = list_entry(lh, struct inet_protosw, list); 1057 1058 /* Check only the non-wild match. */ 1059 if (INET_PROTOSW_PERMANENT & answer->flags) { 1060 if (protocol == answer->protocol) 1061 break; 1062 last_perm = lh; 1063 } 1064 1065 answer = NULL; 1066 } 1067 if (answer) 1068 goto out_permanent; 1069 1070 /* Add the new entry after the last permanent entry if any, so that 1071 * the new entry does not override a permanent entry when matched with 1072 * a wild-card protocol. But it is allowed to override any existing 1073 * non-permanent entry. This means that when we remove this entry, the 1074 * system automatically returns to the old behavior. 1075 */ 1076 list_add_rcu(&p->list, last_perm); 1077 out: 1078 spin_unlock_bh(&inetsw_lock); 1079 1080 return; 1081 1082 out_permanent: 1083 pr_err("Attempt to override permanent protocol %d\n", protocol); 1084 goto out; 1085 1086 out_illegal: 1087 pr_err("Ignoring attempt to register invalid socket type %d\n", 1088 p->type); 1089 goto out; 1090 } 1091 EXPORT_SYMBOL(inet_register_protosw); 1092 1093 void inet_unregister_protosw(struct inet_protosw *p) 1094 { 1095 if (INET_PROTOSW_PERMANENT & p->flags) { 1096 pr_err("Attempt to unregister permanent protocol %d\n", 1097 p->protocol); 1098 } else { 1099 spin_lock_bh(&inetsw_lock); 1100 list_del_rcu(&p->list); 1101 spin_unlock_bh(&inetsw_lock); 1102 1103 synchronize_net(); 1104 } 1105 } 1106 EXPORT_SYMBOL(inet_unregister_protosw); 1107 1108 /* 1109 * Shall we try to damage output packets if routing dev changes? 1110 */ 1111 1112 int sysctl_ip_dynaddr __read_mostly; 1113 1114 static int inet_sk_reselect_saddr(struct sock *sk) 1115 { 1116 struct inet_sock *inet = inet_sk(sk); 1117 __be32 old_saddr = inet->inet_saddr; 1118 __be32 daddr = inet->inet_daddr; 1119 struct flowi4 *fl4; 1120 struct rtable *rt; 1121 __be32 new_saddr; 1122 struct ip_options_rcu *inet_opt; 1123 1124 inet_opt = rcu_dereference_protected(inet->inet_opt, 1125 sock_owned_by_user(sk)); 1126 if (inet_opt && inet_opt->opt.srr) 1127 daddr = inet_opt->opt.faddr; 1128 1129 /* Query new route. */ 1130 fl4 = &inet->cork.fl.u.ip4; 1131 rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk), 1132 sk->sk_bound_dev_if, sk->sk_protocol, 1133 inet->inet_sport, inet->inet_dport, sk); 1134 if (IS_ERR(rt)) 1135 return PTR_ERR(rt); 1136 1137 sk_setup_caps(sk, &rt->dst); 1138 1139 new_saddr = fl4->saddr; 1140 1141 if (new_saddr == old_saddr) 1142 return 0; 1143 1144 if (sysctl_ip_dynaddr > 1) { 1145 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n", 1146 __func__, &old_saddr, &new_saddr); 1147 } 1148 1149 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr; 1150 1151 /* 1152 * XXX The only one ugly spot where we need to 1153 * XXX really change the sockets identity after 1154 * XXX it has entered the hashes. -DaveM 1155 * 1156 * Besides that, it does not check for connection 1157 * uniqueness. Wait for troubles. 1158 */ 1159 __sk_prot_rehash(sk); 1160 return 0; 1161 } 1162 1163 int inet_sk_rebuild_header(struct sock *sk) 1164 { 1165 struct inet_sock *inet = inet_sk(sk); 1166 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); 1167 __be32 daddr; 1168 struct ip_options_rcu *inet_opt; 1169 struct flowi4 *fl4; 1170 int err; 1171 1172 /* Route is OK, nothing to do. */ 1173 if (rt) 1174 return 0; 1175 1176 /* Reroute. */ 1177 rcu_read_lock(); 1178 inet_opt = rcu_dereference(inet->inet_opt); 1179 daddr = inet->inet_daddr; 1180 if (inet_opt && inet_opt->opt.srr) 1181 daddr = inet_opt->opt.faddr; 1182 rcu_read_unlock(); 1183 fl4 = &inet->cork.fl.u.ip4; 1184 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr, 1185 inet->inet_dport, inet->inet_sport, 1186 sk->sk_protocol, RT_CONN_FLAGS(sk), 1187 sk->sk_bound_dev_if); 1188 if (!IS_ERR(rt)) { 1189 err = 0; 1190 sk_setup_caps(sk, &rt->dst); 1191 } else { 1192 err = PTR_ERR(rt); 1193 1194 /* Routing failed... */ 1195 sk->sk_route_caps = 0; 1196 /* 1197 * Other protocols have to map its equivalent state to TCP_SYN_SENT. 1198 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme 1199 */ 1200 if (!sysctl_ip_dynaddr || 1201 sk->sk_state != TCP_SYN_SENT || 1202 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 1203 (err = inet_sk_reselect_saddr(sk)) != 0) 1204 sk->sk_err_soft = -err; 1205 } 1206 1207 return err; 1208 } 1209 EXPORT_SYMBOL(inet_sk_rebuild_header); 1210 1211 static int inet_gso_send_check(struct sk_buff *skb) 1212 { 1213 const struct net_offload *ops; 1214 const struct iphdr *iph; 1215 int proto; 1216 int ihl; 1217 int err = -EINVAL; 1218 1219 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1220 goto out; 1221 1222 iph = ip_hdr(skb); 1223 ihl = iph->ihl * 4; 1224 if (ihl < sizeof(*iph)) 1225 goto out; 1226 1227 proto = iph->protocol; 1228 1229 /* Warning: after this point, iph might be no longer valid */ 1230 if (unlikely(!pskb_may_pull(skb, ihl))) 1231 goto out; 1232 __skb_pull(skb, ihl); 1233 1234 skb_reset_transport_header(skb); 1235 err = -EPROTONOSUPPORT; 1236 1237 ops = rcu_dereference(inet_offloads[proto]); 1238 if (likely(ops && ops->callbacks.gso_send_check)) 1239 err = ops->callbacks.gso_send_check(skb); 1240 1241 out: 1242 return err; 1243 } 1244 1245 static struct sk_buff *inet_gso_segment(struct sk_buff *skb, 1246 netdev_features_t features) 1247 { 1248 struct sk_buff *segs = ERR_PTR(-EINVAL); 1249 const struct net_offload *ops; 1250 unsigned int offset = 0; 1251 bool udpfrag, encap; 1252 struct iphdr *iph; 1253 int proto; 1254 int nhoff; 1255 int ihl; 1256 int id; 1257 1258 if (unlikely(skb_shinfo(skb)->gso_type & 1259 ~(SKB_GSO_TCPV4 | 1260 SKB_GSO_UDP | 1261 SKB_GSO_DODGY | 1262 SKB_GSO_TCP_ECN | 1263 SKB_GSO_GRE | 1264 SKB_GSO_IPIP | 1265 SKB_GSO_SIT | 1266 SKB_GSO_TCPV6 | 1267 SKB_GSO_UDP_TUNNEL | 1268 SKB_GSO_MPLS | 1269 0))) 1270 goto out; 1271 1272 skb_reset_network_header(skb); 1273 nhoff = skb_network_header(skb) - skb_mac_header(skb); 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 id = ntohs(iph->id); 1283 proto = iph->protocol; 1284 1285 /* Warning: after this point, iph might be no longer valid */ 1286 if (unlikely(!pskb_may_pull(skb, ihl))) 1287 goto out; 1288 __skb_pull(skb, ihl); 1289 1290 encap = SKB_GSO_CB(skb)->encap_level > 0; 1291 if (encap) 1292 features = skb->dev->hw_enc_features & netif_skb_features(skb); 1293 SKB_GSO_CB(skb)->encap_level += ihl; 1294 1295 skb_reset_transport_header(skb); 1296 1297 segs = ERR_PTR(-EPROTONOSUPPORT); 1298 1299 if (skb->encapsulation && 1300 skb_shinfo(skb)->gso_type & (SKB_GSO_SIT|SKB_GSO_IPIP)) 1301 udpfrag = proto == IPPROTO_UDP && encap; 1302 else 1303 udpfrag = proto == IPPROTO_UDP && !skb->encapsulation; 1304 1305 ops = rcu_dereference(inet_offloads[proto]); 1306 if (likely(ops && ops->callbacks.gso_segment)) 1307 segs = ops->callbacks.gso_segment(skb, features); 1308 1309 if (IS_ERR_OR_NULL(segs)) 1310 goto out; 1311 1312 skb = segs; 1313 do { 1314 iph = (struct iphdr *)(skb_mac_header(skb) + nhoff); 1315 if (udpfrag) { 1316 iph->id = htons(id); 1317 iph->frag_off = htons(offset >> 3); 1318 if (skb->next != NULL) 1319 iph->frag_off |= htons(IP_MF); 1320 offset += skb->len - nhoff - ihl; 1321 } else { 1322 iph->id = htons(id++); 1323 } 1324 iph->tot_len = htons(skb->len - nhoff); 1325 ip_send_check(iph); 1326 if (encap) 1327 skb_reset_inner_headers(skb); 1328 skb->network_header = (u8 *)iph - skb->head; 1329 } while ((skb = skb->next)); 1330 1331 out: 1332 return segs; 1333 } 1334 1335 static struct sk_buff **inet_gro_receive(struct sk_buff **head, 1336 struct sk_buff *skb) 1337 { 1338 const struct net_offload *ops; 1339 struct sk_buff **pp = NULL; 1340 struct sk_buff *p; 1341 const struct iphdr *iph; 1342 unsigned int hlen; 1343 unsigned int off; 1344 unsigned int id; 1345 int flush = 1; 1346 int proto; 1347 1348 off = skb_gro_offset(skb); 1349 hlen = off + sizeof(*iph); 1350 iph = skb_gro_header_fast(skb, off); 1351 if (skb_gro_header_hard(skb, hlen)) { 1352 iph = skb_gro_header_slow(skb, hlen, off); 1353 if (unlikely(!iph)) 1354 goto out; 1355 } 1356 1357 proto = iph->protocol; 1358 1359 rcu_read_lock(); 1360 ops = rcu_dereference(inet_offloads[proto]); 1361 if (!ops || !ops->callbacks.gro_receive) 1362 goto out_unlock; 1363 1364 if (*(u8 *)iph != 0x45) 1365 goto out_unlock; 1366 1367 if (unlikely(ip_fast_csum((u8 *)iph, 5))) 1368 goto out_unlock; 1369 1370 id = ntohl(*(__be32 *)&iph->id); 1371 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF)); 1372 id >>= 16; 1373 1374 for (p = *head; p; p = p->next) { 1375 struct iphdr *iph2; 1376 1377 if (!NAPI_GRO_CB(p)->same_flow) 1378 continue; 1379 1380 iph2 = (struct iphdr *)(p->data + off); 1381 /* The above works because, with the exception of the top 1382 * (inner most) layer, we only aggregate pkts with the same 1383 * hdr length so all the hdrs we'll need to verify will start 1384 * at the same offset. 1385 */ 1386 if ((iph->protocol ^ iph2->protocol) | 1387 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) | 1388 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) { 1389 NAPI_GRO_CB(p)->same_flow = 0; 1390 continue; 1391 } 1392 1393 /* All fields must match except length and checksum. */ 1394 NAPI_GRO_CB(p)->flush |= 1395 (iph->ttl ^ iph2->ttl) | 1396 (iph->tos ^ iph2->tos) | 1397 ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF)); 1398 1399 /* Save the IP ID check to be included later when we get to 1400 * the transport layer so only the inner most IP ID is checked. 1401 * This is because some GSO/TSO implementations do not 1402 * correctly increment the IP ID for the outer hdrs. 1403 */ 1404 NAPI_GRO_CB(p)->flush_id = 1405 ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id); 1406 NAPI_GRO_CB(p)->flush |= flush; 1407 } 1408 1409 NAPI_GRO_CB(skb)->flush |= flush; 1410 skb_set_network_header(skb, off); 1411 /* The above will be needed by the transport layer if there is one 1412 * immediately following this IP hdr. 1413 */ 1414 1415 skb_gro_pull(skb, sizeof(*iph)); 1416 skb_set_transport_header(skb, skb_gro_offset(skb)); 1417 1418 pp = ops->callbacks.gro_receive(head, skb); 1419 1420 out_unlock: 1421 rcu_read_unlock(); 1422 1423 out: 1424 NAPI_GRO_CB(skb)->flush |= flush; 1425 1426 return pp; 1427 } 1428 1429 static int inet_gro_complete(struct sk_buff *skb, int nhoff) 1430 { 1431 __be16 newlen = htons(skb->len - nhoff); 1432 struct iphdr *iph = (struct iphdr *)(skb->data + nhoff); 1433 const struct net_offload *ops; 1434 int proto = iph->protocol; 1435 int err = -ENOSYS; 1436 1437 csum_replace2(&iph->check, iph->tot_len, newlen); 1438 iph->tot_len = newlen; 1439 1440 rcu_read_lock(); 1441 ops = rcu_dereference(inet_offloads[proto]); 1442 if (WARN_ON(!ops || !ops->callbacks.gro_complete)) 1443 goto out_unlock; 1444 1445 /* Only need to add sizeof(*iph) to get to the next hdr below 1446 * because any hdr with option will have been flushed in 1447 * inet_gro_receive(). 1448 */ 1449 err = ops->callbacks.gro_complete(skb, nhoff + sizeof(*iph)); 1450 1451 out_unlock: 1452 rcu_read_unlock(); 1453 1454 return err; 1455 } 1456 1457 int inet_ctl_sock_create(struct sock **sk, unsigned short family, 1458 unsigned short type, unsigned char protocol, 1459 struct net *net) 1460 { 1461 struct socket *sock; 1462 int rc = sock_create_kern(family, type, protocol, &sock); 1463 1464 if (rc == 0) { 1465 *sk = sock->sk; 1466 (*sk)->sk_allocation = GFP_ATOMIC; 1467 /* 1468 * Unhash it so that IP input processing does not even see it, 1469 * we do not wish this socket to see incoming packets. 1470 */ 1471 (*sk)->sk_prot->unhash(*sk); 1472 1473 sk_change_net(*sk, net); 1474 } 1475 return rc; 1476 } 1477 EXPORT_SYMBOL_GPL(inet_ctl_sock_create); 1478 1479 unsigned long snmp_fold_field(void __percpu *mib[], int offt) 1480 { 1481 unsigned long res = 0; 1482 int i, j; 1483 1484 for_each_possible_cpu(i) { 1485 for (j = 0; j < SNMP_ARRAY_SZ; j++) 1486 res += *(((unsigned long *) per_cpu_ptr(mib[j], i)) + offt); 1487 } 1488 return res; 1489 } 1490 EXPORT_SYMBOL_GPL(snmp_fold_field); 1491 1492 #if BITS_PER_LONG==32 1493 1494 u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t syncp_offset) 1495 { 1496 u64 res = 0; 1497 int cpu; 1498 1499 for_each_possible_cpu(cpu) { 1500 void *bhptr; 1501 struct u64_stats_sync *syncp; 1502 u64 v; 1503 unsigned int start; 1504 1505 bhptr = per_cpu_ptr(mib[0], cpu); 1506 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset); 1507 do { 1508 start = u64_stats_fetch_begin_irq(syncp); 1509 v = *(((u64 *) bhptr) + offt); 1510 } while (u64_stats_fetch_retry_irq(syncp, start)); 1511 1512 res += v; 1513 } 1514 return res; 1515 } 1516 EXPORT_SYMBOL_GPL(snmp_fold_field64); 1517 #endif 1518 1519 int snmp_mib_init(void __percpu *ptr[2], size_t mibsize, size_t align) 1520 { 1521 BUG_ON(ptr == NULL); 1522 ptr[0] = __alloc_percpu(mibsize, align); 1523 if (!ptr[0]) 1524 return -ENOMEM; 1525 1526 #if SNMP_ARRAY_SZ == 2 1527 ptr[1] = __alloc_percpu(mibsize, align); 1528 if (!ptr[1]) { 1529 free_percpu(ptr[0]); 1530 ptr[0] = NULL; 1531 return -ENOMEM; 1532 } 1533 #endif 1534 return 0; 1535 } 1536 EXPORT_SYMBOL_GPL(snmp_mib_init); 1537 1538 #ifdef CONFIG_IP_MULTICAST 1539 static const struct net_protocol igmp_protocol = { 1540 .handler = igmp_rcv, 1541 .netns_ok = 1, 1542 }; 1543 #endif 1544 1545 static const struct net_protocol tcp_protocol = { 1546 .early_demux = tcp_v4_early_demux, 1547 .handler = tcp_v4_rcv, 1548 .err_handler = tcp_v4_err, 1549 .no_policy = 1, 1550 .netns_ok = 1, 1551 .icmp_strict_tag_validation = 1, 1552 }; 1553 1554 static const struct net_protocol udp_protocol = { 1555 .early_demux = udp_v4_early_demux, 1556 .handler = udp_rcv, 1557 .err_handler = udp_err, 1558 .no_policy = 1, 1559 .netns_ok = 1, 1560 }; 1561 1562 static const struct net_protocol icmp_protocol = { 1563 .handler = icmp_rcv, 1564 .err_handler = icmp_err, 1565 .no_policy = 1, 1566 .netns_ok = 1, 1567 }; 1568 1569 static __net_init int ipv4_mib_init_net(struct net *net) 1570 { 1571 int i; 1572 1573 if (snmp_mib_init((void __percpu **)net->mib.tcp_statistics, 1574 sizeof(struct tcp_mib), 1575 __alignof__(struct tcp_mib)) < 0) 1576 goto err_tcp_mib; 1577 if (snmp_mib_init((void __percpu **)net->mib.ip_statistics, 1578 sizeof(struct ipstats_mib), 1579 __alignof__(struct ipstats_mib)) < 0) 1580 goto err_ip_mib; 1581 1582 for_each_possible_cpu(i) { 1583 struct ipstats_mib *af_inet_stats; 1584 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics[0], i); 1585 u64_stats_init(&af_inet_stats->syncp); 1586 #if SNMP_ARRAY_SZ == 2 1587 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics[1], i); 1588 u64_stats_init(&af_inet_stats->syncp); 1589 #endif 1590 } 1591 1592 if (snmp_mib_init((void __percpu **)net->mib.net_statistics, 1593 sizeof(struct linux_mib), 1594 __alignof__(struct linux_mib)) < 0) 1595 goto err_net_mib; 1596 if (snmp_mib_init((void __percpu **)net->mib.udp_statistics, 1597 sizeof(struct udp_mib), 1598 __alignof__(struct udp_mib)) < 0) 1599 goto err_udp_mib; 1600 if (snmp_mib_init((void __percpu **)net->mib.udplite_statistics, 1601 sizeof(struct udp_mib), 1602 __alignof__(struct udp_mib)) < 0) 1603 goto err_udplite_mib; 1604 if (snmp_mib_init((void __percpu **)net->mib.icmp_statistics, 1605 sizeof(struct icmp_mib), 1606 __alignof__(struct icmp_mib)) < 0) 1607 goto err_icmp_mib; 1608 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib), 1609 GFP_KERNEL); 1610 if (!net->mib.icmpmsg_statistics) 1611 goto err_icmpmsg_mib; 1612 1613 tcp_mib_init(net); 1614 return 0; 1615 1616 err_icmpmsg_mib: 1617 snmp_mib_free((void __percpu **)net->mib.icmp_statistics); 1618 err_icmp_mib: 1619 snmp_mib_free((void __percpu **)net->mib.udplite_statistics); 1620 err_udplite_mib: 1621 snmp_mib_free((void __percpu **)net->mib.udp_statistics); 1622 err_udp_mib: 1623 snmp_mib_free((void __percpu **)net->mib.net_statistics); 1624 err_net_mib: 1625 snmp_mib_free((void __percpu **)net->mib.ip_statistics); 1626 err_ip_mib: 1627 snmp_mib_free((void __percpu **)net->mib.tcp_statistics); 1628 err_tcp_mib: 1629 return -ENOMEM; 1630 } 1631 1632 static __net_exit void ipv4_mib_exit_net(struct net *net) 1633 { 1634 kfree(net->mib.icmpmsg_statistics); 1635 snmp_mib_free((void __percpu **)net->mib.icmp_statistics); 1636 snmp_mib_free((void __percpu **)net->mib.udplite_statistics); 1637 snmp_mib_free((void __percpu **)net->mib.udp_statistics); 1638 snmp_mib_free((void __percpu **)net->mib.net_statistics); 1639 snmp_mib_free((void __percpu **)net->mib.ip_statistics); 1640 snmp_mib_free((void __percpu **)net->mib.tcp_statistics); 1641 } 1642 1643 static __net_initdata struct pernet_operations ipv4_mib_ops = { 1644 .init = ipv4_mib_init_net, 1645 .exit = ipv4_mib_exit_net, 1646 }; 1647 1648 static int __init init_ipv4_mibs(void) 1649 { 1650 return register_pernet_subsys(&ipv4_mib_ops); 1651 } 1652 1653 static int ipv4_proc_init(void); 1654 1655 /* 1656 * IP protocol layer initialiser 1657 */ 1658 1659 static struct packet_offload ip_packet_offload __read_mostly = { 1660 .type = cpu_to_be16(ETH_P_IP), 1661 .callbacks = { 1662 .gso_send_check = inet_gso_send_check, 1663 .gso_segment = inet_gso_segment, 1664 .gro_receive = inet_gro_receive, 1665 .gro_complete = inet_gro_complete, 1666 }, 1667 }; 1668 1669 static const struct net_offload ipip_offload = { 1670 .callbacks = { 1671 .gso_send_check = inet_gso_send_check, 1672 .gso_segment = inet_gso_segment, 1673 }, 1674 }; 1675 1676 static int __init ipv4_offload_init(void) 1677 { 1678 /* 1679 * Add offloads 1680 */ 1681 if (udpv4_offload_init() < 0) 1682 pr_crit("%s: Cannot add UDP protocol offload\n", __func__); 1683 if (tcpv4_offload_init() < 0) 1684 pr_crit("%s: Cannot add TCP protocol offload\n", __func__); 1685 1686 dev_add_offload(&ip_packet_offload); 1687 inet_add_offload(&ipip_offload, IPPROTO_IPIP); 1688 return 0; 1689 } 1690 1691 fs_initcall(ipv4_offload_init); 1692 1693 static struct packet_type ip_packet_type __read_mostly = { 1694 .type = cpu_to_be16(ETH_P_IP), 1695 .func = ip_rcv, 1696 }; 1697 1698 static int __init inet_init(void) 1699 { 1700 struct inet_protosw *q; 1701 struct list_head *r; 1702 int rc = -EINVAL; 1703 1704 BUILD_BUG_ON(sizeof(struct inet_skb_parm) > FIELD_SIZEOF(struct sk_buff, cb)); 1705 1706 sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL); 1707 if (!sysctl_local_reserved_ports) 1708 goto out; 1709 1710 rc = proto_register(&tcp_prot, 1); 1711 if (rc) 1712 goto out_free_reserved_ports; 1713 1714 rc = proto_register(&udp_prot, 1); 1715 if (rc) 1716 goto out_unregister_tcp_proto; 1717 1718 rc = proto_register(&raw_prot, 1); 1719 if (rc) 1720 goto out_unregister_udp_proto; 1721 1722 rc = proto_register(&ping_prot, 1); 1723 if (rc) 1724 goto out_unregister_raw_proto; 1725 1726 /* 1727 * Tell SOCKET that we are alive... 1728 */ 1729 1730 (void)sock_register(&inet_family_ops); 1731 1732 #ifdef CONFIG_SYSCTL 1733 ip_static_sysctl_init(); 1734 #endif 1735 1736 /* 1737 * Add all the base protocols. 1738 */ 1739 1740 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 1741 pr_crit("%s: Cannot add ICMP protocol\n", __func__); 1742 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) 1743 pr_crit("%s: Cannot add UDP protocol\n", __func__); 1744 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) 1745 pr_crit("%s: Cannot add TCP protocol\n", __func__); 1746 #ifdef CONFIG_IP_MULTICAST 1747 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 1748 pr_crit("%s: Cannot add IGMP protocol\n", __func__); 1749 #endif 1750 1751 /* Register the socket-side information for inet_create. */ 1752 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 1753 INIT_LIST_HEAD(r); 1754 1755 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 1756 inet_register_protosw(q); 1757 1758 /* 1759 * Set the ARP module up 1760 */ 1761 1762 arp_init(); 1763 1764 /* 1765 * Set the IP module up 1766 */ 1767 1768 ip_init(); 1769 1770 tcp_v4_init(); 1771 1772 /* Setup TCP slab cache for open requests. */ 1773 tcp_init(); 1774 1775 /* Setup UDP memory threshold */ 1776 udp_init(); 1777 1778 /* Add UDP-Lite (RFC 3828) */ 1779 udplite4_register(); 1780 1781 ping_init(); 1782 1783 /* 1784 * Set the ICMP layer up 1785 */ 1786 1787 if (icmp_init() < 0) 1788 panic("Failed to create the ICMP control socket.\n"); 1789 1790 /* 1791 * Initialise the multicast router 1792 */ 1793 #if defined(CONFIG_IP_MROUTE) 1794 if (ip_mr_init()) 1795 pr_crit("%s: Cannot init ipv4 mroute\n", __func__); 1796 #endif 1797 /* 1798 * Initialise per-cpu ipv4 mibs 1799 */ 1800 1801 if (init_ipv4_mibs()) 1802 pr_crit("%s: Cannot init ipv4 mibs\n", __func__); 1803 1804 ipv4_proc_init(); 1805 1806 ipfrag_init(); 1807 1808 dev_add_pack(&ip_packet_type); 1809 1810 rc = 0; 1811 out: 1812 return rc; 1813 out_unregister_raw_proto: 1814 proto_unregister(&raw_prot); 1815 out_unregister_udp_proto: 1816 proto_unregister(&udp_prot); 1817 out_unregister_tcp_proto: 1818 proto_unregister(&tcp_prot); 1819 out_free_reserved_ports: 1820 kfree(sysctl_local_reserved_ports); 1821 goto out; 1822 } 1823 1824 fs_initcall(inet_init); 1825 1826 /* ------------------------------------------------------------------------ */ 1827 1828 #ifdef CONFIG_PROC_FS 1829 static int __init ipv4_proc_init(void) 1830 { 1831 int rc = 0; 1832 1833 if (raw_proc_init()) 1834 goto out_raw; 1835 if (tcp4_proc_init()) 1836 goto out_tcp; 1837 if (udp4_proc_init()) 1838 goto out_udp; 1839 if (ping_proc_init()) 1840 goto out_ping; 1841 if (ip_misc_proc_init()) 1842 goto out_misc; 1843 out: 1844 return rc; 1845 out_misc: 1846 ping_proc_exit(); 1847 out_ping: 1848 udp4_proc_exit(); 1849 out_udp: 1850 tcp4_proc_exit(); 1851 out_tcp: 1852 raw_proc_exit(); 1853 out_raw: 1854 rc = -ENOMEM; 1855 goto out; 1856 } 1857 1858 #else /* CONFIG_PROC_FS */ 1859 static int __init ipv4_proc_init(void) 1860 { 1861 return 0; 1862 } 1863 #endif /* CONFIG_PROC_FS */ 1864 1865 MODULE_ALIAS_NETPROTO(PF_INET); 1866 1867