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 int try_loading_module = 0; 258 int err; 259 260 sock->state = SS_UNCONNECTED; 261 262 /* Look for the requested type/protocol pair. */ 263 lookup_protocol: 264 err = -ESOCKTNOSUPPORT; 265 rcu_read_lock(); 266 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) { 267 268 err = 0; 269 /* Check the non-wild match. */ 270 if (protocol == answer->protocol) { 271 if (protocol != IPPROTO_IP) 272 break; 273 } else { 274 /* Check for the two wild cases. */ 275 if (IPPROTO_IP == protocol) { 276 protocol = answer->protocol; 277 break; 278 } 279 if (IPPROTO_IP == answer->protocol) 280 break; 281 } 282 err = -EPROTONOSUPPORT; 283 } 284 285 if (unlikely(err)) { 286 if (try_loading_module < 2) { 287 rcu_read_unlock(); 288 /* 289 * Be more specific, e.g. net-pf-2-proto-132-type-1 290 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) 291 */ 292 if (++try_loading_module == 1) 293 request_module("net-pf-%d-proto-%d-type-%d", 294 PF_INET, protocol, sock->type); 295 /* 296 * Fall back to generic, e.g. net-pf-2-proto-132 297 * (net-pf-PF_INET-proto-IPPROTO_SCTP) 298 */ 299 else 300 request_module("net-pf-%d-proto-%d", 301 PF_INET, protocol); 302 goto lookup_protocol; 303 } else 304 goto out_rcu_unlock; 305 } 306 307 err = -EPERM; 308 if (sock->type == SOCK_RAW && !kern && 309 !ns_capable(net->user_ns, CAP_NET_RAW)) 310 goto out_rcu_unlock; 311 312 sock->ops = answer->ops; 313 answer_prot = answer->prot; 314 answer_flags = answer->flags; 315 rcu_read_unlock(); 316 317 WARN_ON(answer_prot->slab == NULL); 318 319 err = -ENOBUFS; 320 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot); 321 if (sk == NULL) 322 goto out; 323 324 err = 0; 325 if (INET_PROTOSW_REUSE & answer_flags) 326 sk->sk_reuse = SK_CAN_REUSE; 327 328 inet = inet_sk(sk); 329 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 330 331 inet->nodefrag = 0; 332 333 if (SOCK_RAW == sock->type) { 334 inet->inet_num = protocol; 335 if (IPPROTO_RAW == protocol) 336 inet->hdrincl = 1; 337 } 338 339 if (net->ipv4.sysctl_ip_no_pmtu_disc) 340 inet->pmtudisc = IP_PMTUDISC_DONT; 341 else 342 inet->pmtudisc = IP_PMTUDISC_WANT; 343 344 inet->inet_id = 0; 345 346 sock_init_data(sock, sk); 347 348 sk->sk_destruct = inet_sock_destruct; 349 sk->sk_protocol = protocol; 350 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 351 352 inet->uc_ttl = -1; 353 inet->mc_loop = 1; 354 inet->mc_ttl = 1; 355 inet->mc_all = 1; 356 inet->mc_index = 0; 357 inet->mc_list = NULL; 358 inet->rcv_tos = 0; 359 360 sk_refcnt_debug_inc(sk); 361 362 if (inet->inet_num) { 363 /* It assumes that any protocol which allows 364 * the user to assign a number at socket 365 * creation time automatically 366 * shares. 367 */ 368 inet->inet_sport = htons(inet->inet_num); 369 /* Add to protocol hash chains. */ 370 sk->sk_prot->hash(sk); 371 } 372 373 if (sk->sk_prot->init) { 374 err = sk->sk_prot->init(sk); 375 if (err) 376 sk_common_release(sk); 377 } 378 out: 379 return err; 380 out_rcu_unlock: 381 rcu_read_unlock(); 382 goto out; 383 } 384 385 386 /* 387 * The peer socket should always be NULL (or else). When we call this 388 * function we are destroying the object and from then on nobody 389 * should refer to it. 390 */ 391 int inet_release(struct socket *sock) 392 { 393 struct sock *sk = sock->sk; 394 395 if (sk) { 396 long timeout; 397 398 sock_rps_reset_flow(sk); 399 400 /* Applications forget to leave groups before exiting */ 401 ip_mc_drop_socket(sk); 402 403 /* If linger is set, we don't return until the close 404 * is complete. Otherwise we return immediately. The 405 * actually closing is done the same either way. 406 * 407 * If the close is due to the process exiting, we never 408 * linger.. 409 */ 410 timeout = 0; 411 if (sock_flag(sk, SOCK_LINGER) && 412 !(current->flags & PF_EXITING)) 413 timeout = sk->sk_lingertime; 414 sock->sk = NULL; 415 sk->sk_prot->close(sk, timeout); 416 } 417 return 0; 418 } 419 EXPORT_SYMBOL(inet_release); 420 421 /* It is off by default, see below. */ 422 int sysctl_ip_nonlocal_bind __read_mostly; 423 EXPORT_SYMBOL(sysctl_ip_nonlocal_bind); 424 425 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 426 { 427 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 428 struct sock *sk = sock->sk; 429 struct inet_sock *inet = inet_sk(sk); 430 struct net *net = sock_net(sk); 431 unsigned short snum; 432 int chk_addr_ret; 433 int err; 434 435 /* If the socket has its own bind function then use it. (RAW) */ 436 if (sk->sk_prot->bind) { 437 err = sk->sk_prot->bind(sk, uaddr, addr_len); 438 goto out; 439 } 440 err = -EINVAL; 441 if (addr_len < sizeof(struct sockaddr_in)) 442 goto out; 443 444 if (addr->sin_family != AF_INET) { 445 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET) 446 * only if s_addr is INADDR_ANY. 447 */ 448 err = -EAFNOSUPPORT; 449 if (addr->sin_family != AF_UNSPEC || 450 addr->sin_addr.s_addr != htonl(INADDR_ANY)) 451 goto out; 452 } 453 454 chk_addr_ret = inet_addr_type(net, addr->sin_addr.s_addr); 455 456 /* Not specified by any standard per-se, however it breaks too 457 * many applications when removed. It is unfortunate since 458 * allowing applications to make a non-local bind solves 459 * several problems with systems using dynamic addressing. 460 * (ie. your servers still start up even if your ISDN link 461 * is temporarily down) 462 */ 463 err = -EADDRNOTAVAIL; 464 if (!sysctl_ip_nonlocal_bind && 465 !(inet->freebind || inet->transparent) && 466 addr->sin_addr.s_addr != htonl(INADDR_ANY) && 467 chk_addr_ret != RTN_LOCAL && 468 chk_addr_ret != RTN_MULTICAST && 469 chk_addr_ret != RTN_BROADCAST) 470 goto out; 471 472 snum = ntohs(addr->sin_port); 473 err = -EACCES; 474 if (snum && snum < PROT_SOCK && 475 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 476 goto out; 477 478 /* We keep a pair of addresses. rcv_saddr is the one 479 * used by hash lookups, and saddr is used for transmit. 480 * 481 * In the BSD API these are the same except where it 482 * would be illegal to use them (multicast/broadcast) in 483 * which case the sending device address is used. 484 */ 485 lock_sock(sk); 486 487 /* Check these errors (active socket, double bind). */ 488 err = -EINVAL; 489 if (sk->sk_state != TCP_CLOSE || inet->inet_num) 490 goto out_release_sock; 491 492 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 493 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 494 inet->inet_saddr = 0; /* Use device */ 495 496 /* Make sure we are allowed to bind here. */ 497 if (sk->sk_prot->get_port(sk, snum)) { 498 inet->inet_saddr = inet->inet_rcv_saddr = 0; 499 err = -EADDRINUSE; 500 goto out_release_sock; 501 } 502 503 if (inet->inet_rcv_saddr) 504 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 505 if (snum) 506 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 507 inet->inet_sport = htons(inet->inet_num); 508 inet->inet_daddr = 0; 509 inet->inet_dport = 0; 510 sk_dst_reset(sk); 511 err = 0; 512 out_release_sock: 513 release_sock(sk); 514 out: 515 return err; 516 } 517 EXPORT_SYMBOL(inet_bind); 518 519 int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr, 520 int addr_len, int flags) 521 { 522 struct sock *sk = sock->sk; 523 524 if (addr_len < sizeof(uaddr->sa_family)) 525 return -EINVAL; 526 if (uaddr->sa_family == AF_UNSPEC) 527 return sk->sk_prot->disconnect(sk, flags); 528 529 if (!inet_sk(sk)->inet_num && inet_autobind(sk)) 530 return -EAGAIN; 531 return sk->sk_prot->connect(sk, uaddr, addr_len); 532 } 533 EXPORT_SYMBOL(inet_dgram_connect); 534 535 static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias) 536 { 537 DEFINE_WAIT(wait); 538 539 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 540 sk->sk_write_pending += writebias; 541 542 /* Basic assumption: if someone sets sk->sk_err, he _must_ 543 * change state of the socket from TCP_SYN_*. 544 * Connect() does not allow to get error notifications 545 * without closing the socket. 546 */ 547 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 548 release_sock(sk); 549 timeo = schedule_timeout(timeo); 550 lock_sock(sk); 551 if (signal_pending(current) || !timeo) 552 break; 553 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 554 } 555 finish_wait(sk_sleep(sk), &wait); 556 sk->sk_write_pending -= writebias; 557 return timeo; 558 } 559 560 /* 561 * Connect to a remote host. There is regrettably still a little 562 * TCP 'magic' in here. 563 */ 564 int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 565 int addr_len, int flags) 566 { 567 struct sock *sk = sock->sk; 568 int err; 569 long timeo; 570 571 if (addr_len < sizeof(uaddr->sa_family)) 572 return -EINVAL; 573 574 if (uaddr->sa_family == AF_UNSPEC) { 575 err = sk->sk_prot->disconnect(sk, flags); 576 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 577 goto out; 578 } 579 580 switch (sock->state) { 581 default: 582 err = -EINVAL; 583 goto out; 584 case SS_CONNECTED: 585 err = -EISCONN; 586 goto out; 587 case SS_CONNECTING: 588 err = -EALREADY; 589 /* Fall out of switch with err, set for this state */ 590 break; 591 case SS_UNCONNECTED: 592 err = -EISCONN; 593 if (sk->sk_state != TCP_CLOSE) 594 goto out; 595 596 err = sk->sk_prot->connect(sk, uaddr, addr_len); 597 if (err < 0) 598 goto out; 599 600 sock->state = SS_CONNECTING; 601 602 /* Just entered SS_CONNECTING state; the only 603 * difference is that return value in non-blocking 604 * case is EINPROGRESS, rather than EALREADY. 605 */ 606 err = -EINPROGRESS; 607 break; 608 } 609 610 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 611 612 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 613 int writebias = (sk->sk_protocol == IPPROTO_TCP) && 614 tcp_sk(sk)->fastopen_req && 615 tcp_sk(sk)->fastopen_req->data ? 1 : 0; 616 617 /* Error code is set above */ 618 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias)) 619 goto out; 620 621 err = sock_intr_errno(timeo); 622 if (signal_pending(current)) 623 goto out; 624 } 625 626 /* Connection was closed by RST, timeout, ICMP error 627 * or another process disconnected us. 628 */ 629 if (sk->sk_state == TCP_CLOSE) 630 goto sock_error; 631 632 /* sk->sk_err may be not zero now, if RECVERR was ordered by user 633 * and error was received after socket entered established state. 634 * Hence, it is handled normally after connect() return successfully. 635 */ 636 637 sock->state = SS_CONNECTED; 638 err = 0; 639 out: 640 return err; 641 642 sock_error: 643 err = sock_error(sk) ? : -ECONNABORTED; 644 sock->state = SS_UNCONNECTED; 645 if (sk->sk_prot->disconnect(sk, flags)) 646 sock->state = SS_DISCONNECTING; 647 goto out; 648 } 649 EXPORT_SYMBOL(__inet_stream_connect); 650 651 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 652 int addr_len, int flags) 653 { 654 int err; 655 656 lock_sock(sock->sk); 657 err = __inet_stream_connect(sock, uaddr, addr_len, flags); 658 release_sock(sock->sk); 659 return err; 660 } 661 EXPORT_SYMBOL(inet_stream_connect); 662 663 /* 664 * Accept a pending connection. The TCP layer now gives BSD semantics. 665 */ 666 667 int inet_accept(struct socket *sock, struct socket *newsock, int flags) 668 { 669 struct sock *sk1 = sock->sk; 670 int err = -EINVAL; 671 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err); 672 673 if (!sk2) 674 goto do_err; 675 676 lock_sock(sk2); 677 678 sock_rps_record_flow(sk2); 679 WARN_ON(!((1 << sk2->sk_state) & 680 (TCPF_ESTABLISHED | TCPF_SYN_RECV | 681 TCPF_CLOSE_WAIT | TCPF_CLOSE))); 682 683 sock_graft(sk2, newsock); 684 685 newsock->state = SS_CONNECTED; 686 err = 0; 687 release_sock(sk2); 688 do_err: 689 return err; 690 } 691 EXPORT_SYMBOL(inet_accept); 692 693 694 /* 695 * This does both peername and sockname. 696 */ 697 int inet_getname(struct socket *sock, struct sockaddr *uaddr, 698 int *uaddr_len, int peer) 699 { 700 struct sock *sk = sock->sk; 701 struct inet_sock *inet = inet_sk(sk); 702 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr); 703 704 sin->sin_family = AF_INET; 705 if (peer) { 706 if (!inet->inet_dport || 707 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 708 peer == 1)) 709 return -ENOTCONN; 710 sin->sin_port = inet->inet_dport; 711 sin->sin_addr.s_addr = inet->inet_daddr; 712 } else { 713 __be32 addr = inet->inet_rcv_saddr; 714 if (!addr) 715 addr = inet->inet_saddr; 716 sin->sin_port = inet->inet_sport; 717 sin->sin_addr.s_addr = addr; 718 } 719 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 720 *uaddr_len = sizeof(*sin); 721 return 0; 722 } 723 EXPORT_SYMBOL(inet_getname); 724 725 int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 726 size_t size) 727 { 728 struct sock *sk = sock->sk; 729 730 sock_rps_record_flow(sk); 731 732 /* We may need to bind the socket. */ 733 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 734 inet_autobind(sk)) 735 return -EAGAIN; 736 737 return sk->sk_prot->sendmsg(iocb, sk, msg, size); 738 } 739 EXPORT_SYMBOL(inet_sendmsg); 740 741 ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, 742 size_t size, int flags) 743 { 744 struct sock *sk = sock->sk; 745 746 sock_rps_record_flow(sk); 747 748 /* We may need to bind the socket. */ 749 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 750 inet_autobind(sk)) 751 return -EAGAIN; 752 753 if (sk->sk_prot->sendpage) 754 return sk->sk_prot->sendpage(sk, page, offset, size, flags); 755 return sock_no_sendpage(sock, page, offset, size, flags); 756 } 757 EXPORT_SYMBOL(inet_sendpage); 758 759 int inet_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 760 size_t size, int flags) 761 { 762 struct sock *sk = sock->sk; 763 int addr_len = 0; 764 int err; 765 766 sock_rps_record_flow(sk); 767 768 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, 769 flags & ~MSG_DONTWAIT, &addr_len); 770 if (err >= 0) 771 msg->msg_namelen = addr_len; 772 return err; 773 } 774 EXPORT_SYMBOL(inet_recvmsg); 775 776 int inet_shutdown(struct socket *sock, int how) 777 { 778 struct sock *sk = sock->sk; 779 int err = 0; 780 781 /* This should really check to make sure 782 * the socket is a TCP socket. (WHY AC...) 783 */ 784 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and 785 1->2 bit 2 snds. 786 2->3 */ 787 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ 788 return -EINVAL; 789 790 lock_sock(sk); 791 if (sock->state == SS_CONNECTING) { 792 if ((1 << sk->sk_state) & 793 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) 794 sock->state = SS_DISCONNECTING; 795 else 796 sock->state = SS_CONNECTED; 797 } 798 799 switch (sk->sk_state) { 800 case TCP_CLOSE: 801 err = -ENOTCONN; 802 /* Hack to wake up other listeners, who can poll for 803 POLLHUP, even on eg. unconnected UDP sockets -- RR */ 804 default: 805 sk->sk_shutdown |= how; 806 if (sk->sk_prot->shutdown) 807 sk->sk_prot->shutdown(sk, how); 808 break; 809 810 /* Remaining two branches are temporary solution for missing 811 * close() in multithreaded environment. It is _not_ a good idea, 812 * but we have no choice until close() is repaired at VFS level. 813 */ 814 case TCP_LISTEN: 815 if (!(how & RCV_SHUTDOWN)) 816 break; 817 /* Fall through */ 818 case TCP_SYN_SENT: 819 err = sk->sk_prot->disconnect(sk, O_NONBLOCK); 820 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 821 break; 822 } 823 824 /* Wake up anyone sleeping in poll. */ 825 sk->sk_state_change(sk); 826 release_sock(sk); 827 return err; 828 } 829 EXPORT_SYMBOL(inet_shutdown); 830 831 /* 832 * ioctl() calls you can issue on an INET socket. Most of these are 833 * device configuration and stuff and very rarely used. Some ioctls 834 * pass on to the socket itself. 835 * 836 * NOTE: I like the idea of a module for the config stuff. ie ifconfig 837 * loads the devconfigure module does its configuring and unloads it. 838 * There's a good 20K of config code hanging around the kernel. 839 */ 840 841 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 842 { 843 struct sock *sk = sock->sk; 844 int err = 0; 845 struct net *net = sock_net(sk); 846 847 switch (cmd) { 848 case SIOCGSTAMP: 849 err = sock_get_timestamp(sk, (struct timeval __user *)arg); 850 break; 851 case SIOCGSTAMPNS: 852 err = sock_get_timestampns(sk, (struct timespec __user *)arg); 853 break; 854 case SIOCADDRT: 855 case SIOCDELRT: 856 case SIOCRTMSG: 857 err = ip_rt_ioctl(net, cmd, (void __user *)arg); 858 break; 859 case SIOCDARP: 860 case SIOCGARP: 861 case SIOCSARP: 862 err = arp_ioctl(net, cmd, (void __user *)arg); 863 break; 864 case SIOCGIFADDR: 865 case SIOCSIFADDR: 866 case SIOCGIFBRDADDR: 867 case SIOCSIFBRDADDR: 868 case SIOCGIFNETMASK: 869 case SIOCSIFNETMASK: 870 case SIOCGIFDSTADDR: 871 case SIOCSIFDSTADDR: 872 case SIOCSIFPFLAGS: 873 case SIOCGIFPFLAGS: 874 case SIOCSIFFLAGS: 875 err = devinet_ioctl(net, cmd, (void __user *)arg); 876 break; 877 default: 878 if (sk->sk_prot->ioctl) 879 err = sk->sk_prot->ioctl(sk, cmd, arg); 880 else 881 err = -ENOIOCTLCMD; 882 break; 883 } 884 return err; 885 } 886 EXPORT_SYMBOL(inet_ioctl); 887 888 #ifdef CONFIG_COMPAT 889 static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 890 { 891 struct sock *sk = sock->sk; 892 int err = -ENOIOCTLCMD; 893 894 if (sk->sk_prot->compat_ioctl) 895 err = sk->sk_prot->compat_ioctl(sk, cmd, arg); 896 897 return err; 898 } 899 #endif 900 901 const struct proto_ops inet_stream_ops = { 902 .family = PF_INET, 903 .owner = THIS_MODULE, 904 .release = inet_release, 905 .bind = inet_bind, 906 .connect = inet_stream_connect, 907 .socketpair = sock_no_socketpair, 908 .accept = inet_accept, 909 .getname = inet_getname, 910 .poll = tcp_poll, 911 .ioctl = inet_ioctl, 912 .listen = inet_listen, 913 .shutdown = inet_shutdown, 914 .setsockopt = sock_common_setsockopt, 915 .getsockopt = sock_common_getsockopt, 916 .sendmsg = inet_sendmsg, 917 .recvmsg = inet_recvmsg, 918 .mmap = sock_no_mmap, 919 .sendpage = inet_sendpage, 920 .splice_read = tcp_splice_read, 921 #ifdef CONFIG_COMPAT 922 .compat_setsockopt = compat_sock_common_setsockopt, 923 .compat_getsockopt = compat_sock_common_getsockopt, 924 .compat_ioctl = inet_compat_ioctl, 925 #endif 926 }; 927 EXPORT_SYMBOL(inet_stream_ops); 928 929 const struct proto_ops inet_dgram_ops = { 930 .family = PF_INET, 931 .owner = THIS_MODULE, 932 .release = inet_release, 933 .bind = inet_bind, 934 .connect = inet_dgram_connect, 935 .socketpair = sock_no_socketpair, 936 .accept = sock_no_accept, 937 .getname = inet_getname, 938 .poll = udp_poll, 939 .ioctl = inet_ioctl, 940 .listen = sock_no_listen, 941 .shutdown = inet_shutdown, 942 .setsockopt = sock_common_setsockopt, 943 .getsockopt = sock_common_getsockopt, 944 .sendmsg = inet_sendmsg, 945 .recvmsg = inet_recvmsg, 946 .mmap = sock_no_mmap, 947 .sendpage = inet_sendpage, 948 #ifdef CONFIG_COMPAT 949 .compat_setsockopt = compat_sock_common_setsockopt, 950 .compat_getsockopt = compat_sock_common_getsockopt, 951 .compat_ioctl = inet_compat_ioctl, 952 #endif 953 }; 954 EXPORT_SYMBOL(inet_dgram_ops); 955 956 /* 957 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 958 * udp_poll 959 */ 960 static const struct proto_ops inet_sockraw_ops = { 961 .family = PF_INET, 962 .owner = THIS_MODULE, 963 .release = inet_release, 964 .bind = inet_bind, 965 .connect = inet_dgram_connect, 966 .socketpair = sock_no_socketpair, 967 .accept = sock_no_accept, 968 .getname = inet_getname, 969 .poll = datagram_poll, 970 .ioctl = inet_ioctl, 971 .listen = sock_no_listen, 972 .shutdown = inet_shutdown, 973 .setsockopt = sock_common_setsockopt, 974 .getsockopt = sock_common_getsockopt, 975 .sendmsg = inet_sendmsg, 976 .recvmsg = inet_recvmsg, 977 .mmap = sock_no_mmap, 978 .sendpage = inet_sendpage, 979 #ifdef CONFIG_COMPAT 980 .compat_setsockopt = compat_sock_common_setsockopt, 981 .compat_getsockopt = compat_sock_common_getsockopt, 982 .compat_ioctl = inet_compat_ioctl, 983 #endif 984 }; 985 986 static const struct net_proto_family inet_family_ops = { 987 .family = PF_INET, 988 .create = inet_create, 989 .owner = THIS_MODULE, 990 }; 991 992 /* Upon startup we insert all the elements in inetsw_array[] into 993 * the linked list inetsw. 994 */ 995 static struct inet_protosw inetsw_array[] = 996 { 997 { 998 .type = SOCK_STREAM, 999 .protocol = IPPROTO_TCP, 1000 .prot = &tcp_prot, 1001 .ops = &inet_stream_ops, 1002 .flags = INET_PROTOSW_PERMANENT | 1003 INET_PROTOSW_ICSK, 1004 }, 1005 1006 { 1007 .type = SOCK_DGRAM, 1008 .protocol = IPPROTO_UDP, 1009 .prot = &udp_prot, 1010 .ops = &inet_dgram_ops, 1011 .flags = INET_PROTOSW_PERMANENT, 1012 }, 1013 1014 { 1015 .type = SOCK_DGRAM, 1016 .protocol = IPPROTO_ICMP, 1017 .prot = &ping_prot, 1018 .ops = &inet_dgram_ops, 1019 .flags = INET_PROTOSW_REUSE, 1020 }, 1021 1022 { 1023 .type = SOCK_RAW, 1024 .protocol = IPPROTO_IP, /* wild card */ 1025 .prot = &raw_prot, 1026 .ops = &inet_sockraw_ops, 1027 .flags = INET_PROTOSW_REUSE, 1028 } 1029 }; 1030 1031 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) 1032 1033 void inet_register_protosw(struct inet_protosw *p) 1034 { 1035 struct list_head *lh; 1036 struct inet_protosw *answer; 1037 int protocol = p->protocol; 1038 struct list_head *last_perm; 1039 1040 spin_lock_bh(&inetsw_lock); 1041 1042 if (p->type >= SOCK_MAX) 1043 goto out_illegal; 1044 1045 /* If we are trying to override a permanent protocol, bail. */ 1046 answer = NULL; 1047 last_perm = &inetsw[p->type]; 1048 list_for_each(lh, &inetsw[p->type]) { 1049 answer = list_entry(lh, struct inet_protosw, list); 1050 1051 /* Check only the non-wild match. */ 1052 if (INET_PROTOSW_PERMANENT & answer->flags) { 1053 if (protocol == answer->protocol) 1054 break; 1055 last_perm = lh; 1056 } 1057 1058 answer = NULL; 1059 } 1060 if (answer) 1061 goto out_permanent; 1062 1063 /* Add the new entry after the last permanent entry if any, so that 1064 * the new entry does not override a permanent entry when matched with 1065 * a wild-card protocol. But it is allowed to override any existing 1066 * non-permanent entry. This means that when we remove this entry, the 1067 * system automatically returns to the old behavior. 1068 */ 1069 list_add_rcu(&p->list, last_perm); 1070 out: 1071 spin_unlock_bh(&inetsw_lock); 1072 1073 return; 1074 1075 out_permanent: 1076 pr_err("Attempt to override permanent protocol %d\n", protocol); 1077 goto out; 1078 1079 out_illegal: 1080 pr_err("Ignoring attempt to register invalid socket type %d\n", 1081 p->type); 1082 goto out; 1083 } 1084 EXPORT_SYMBOL(inet_register_protosw); 1085 1086 void inet_unregister_protosw(struct inet_protosw *p) 1087 { 1088 if (INET_PROTOSW_PERMANENT & p->flags) { 1089 pr_err("Attempt to unregister permanent protocol %d\n", 1090 p->protocol); 1091 } else { 1092 spin_lock_bh(&inetsw_lock); 1093 list_del_rcu(&p->list); 1094 spin_unlock_bh(&inetsw_lock); 1095 1096 synchronize_net(); 1097 } 1098 } 1099 EXPORT_SYMBOL(inet_unregister_protosw); 1100 1101 /* 1102 * Shall we try to damage output packets if routing dev changes? 1103 */ 1104 1105 int sysctl_ip_dynaddr __read_mostly; 1106 1107 static int inet_sk_reselect_saddr(struct sock *sk) 1108 { 1109 struct inet_sock *inet = inet_sk(sk); 1110 __be32 old_saddr = inet->inet_saddr; 1111 __be32 daddr = inet->inet_daddr; 1112 struct flowi4 *fl4; 1113 struct rtable *rt; 1114 __be32 new_saddr; 1115 struct ip_options_rcu *inet_opt; 1116 1117 inet_opt = rcu_dereference_protected(inet->inet_opt, 1118 sock_owned_by_user(sk)); 1119 if (inet_opt && inet_opt->opt.srr) 1120 daddr = inet_opt->opt.faddr; 1121 1122 /* Query new route. */ 1123 fl4 = &inet->cork.fl.u.ip4; 1124 rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk), 1125 sk->sk_bound_dev_if, sk->sk_protocol, 1126 inet->inet_sport, inet->inet_dport, sk); 1127 if (IS_ERR(rt)) 1128 return PTR_ERR(rt); 1129 1130 sk_setup_caps(sk, &rt->dst); 1131 1132 new_saddr = fl4->saddr; 1133 1134 if (new_saddr == old_saddr) 1135 return 0; 1136 1137 if (sysctl_ip_dynaddr > 1) { 1138 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n", 1139 __func__, &old_saddr, &new_saddr); 1140 } 1141 1142 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr; 1143 1144 /* 1145 * XXX The only one ugly spot where we need to 1146 * XXX really change the sockets identity after 1147 * XXX it has entered the hashes. -DaveM 1148 * 1149 * Besides that, it does not check for connection 1150 * uniqueness. Wait for troubles. 1151 */ 1152 __sk_prot_rehash(sk); 1153 return 0; 1154 } 1155 1156 int inet_sk_rebuild_header(struct sock *sk) 1157 { 1158 struct inet_sock *inet = inet_sk(sk); 1159 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); 1160 __be32 daddr; 1161 struct ip_options_rcu *inet_opt; 1162 struct flowi4 *fl4; 1163 int err; 1164 1165 /* Route is OK, nothing to do. */ 1166 if (rt) 1167 return 0; 1168 1169 /* Reroute. */ 1170 rcu_read_lock(); 1171 inet_opt = rcu_dereference(inet->inet_opt); 1172 daddr = inet->inet_daddr; 1173 if (inet_opt && inet_opt->opt.srr) 1174 daddr = inet_opt->opt.faddr; 1175 rcu_read_unlock(); 1176 fl4 = &inet->cork.fl.u.ip4; 1177 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr, 1178 inet->inet_dport, inet->inet_sport, 1179 sk->sk_protocol, RT_CONN_FLAGS(sk), 1180 sk->sk_bound_dev_if); 1181 if (!IS_ERR(rt)) { 1182 err = 0; 1183 sk_setup_caps(sk, &rt->dst); 1184 } else { 1185 err = PTR_ERR(rt); 1186 1187 /* Routing failed... */ 1188 sk->sk_route_caps = 0; 1189 /* 1190 * Other protocols have to map its equivalent state to TCP_SYN_SENT. 1191 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme 1192 */ 1193 if (!sysctl_ip_dynaddr || 1194 sk->sk_state != TCP_SYN_SENT || 1195 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 1196 (err = inet_sk_reselect_saddr(sk)) != 0) 1197 sk->sk_err_soft = -err; 1198 } 1199 1200 return err; 1201 } 1202 EXPORT_SYMBOL(inet_sk_rebuild_header); 1203 1204 static int inet_gso_send_check(struct sk_buff *skb) 1205 { 1206 const struct net_offload *ops; 1207 const struct iphdr *iph; 1208 int proto; 1209 int ihl; 1210 int err = -EINVAL; 1211 1212 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1213 goto out; 1214 1215 iph = ip_hdr(skb); 1216 ihl = iph->ihl * 4; 1217 if (ihl < sizeof(*iph)) 1218 goto out; 1219 1220 proto = iph->protocol; 1221 1222 /* Warning: after this point, iph might be no longer valid */ 1223 if (unlikely(!pskb_may_pull(skb, ihl))) 1224 goto out; 1225 __skb_pull(skb, ihl); 1226 1227 skb_reset_transport_header(skb); 1228 err = -EPROTONOSUPPORT; 1229 1230 ops = rcu_dereference(inet_offloads[proto]); 1231 if (likely(ops && ops->callbacks.gso_send_check)) 1232 err = ops->callbacks.gso_send_check(skb); 1233 1234 out: 1235 return err; 1236 } 1237 1238 static struct sk_buff *inet_gso_segment(struct sk_buff *skb, 1239 netdev_features_t features) 1240 { 1241 struct sk_buff *segs = ERR_PTR(-EINVAL); 1242 const struct net_offload *ops; 1243 unsigned int offset = 0; 1244 bool udpfrag, encap; 1245 struct iphdr *iph; 1246 int proto; 1247 int nhoff; 1248 int ihl; 1249 int id; 1250 1251 if (unlikely(skb_shinfo(skb)->gso_type & 1252 ~(SKB_GSO_TCPV4 | 1253 SKB_GSO_UDP | 1254 SKB_GSO_DODGY | 1255 SKB_GSO_TCP_ECN | 1256 SKB_GSO_GRE | 1257 SKB_GSO_GRE_CSUM | 1258 SKB_GSO_IPIP | 1259 SKB_GSO_SIT | 1260 SKB_GSO_TCPV6 | 1261 SKB_GSO_UDP_TUNNEL | 1262 SKB_GSO_UDP_TUNNEL_CSUM | 1263 SKB_GSO_MPLS | 1264 0))) 1265 goto out; 1266 1267 skb_reset_network_header(skb); 1268 nhoff = skb_network_header(skb) - skb_mac_header(skb); 1269 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1270 goto out; 1271 1272 iph = ip_hdr(skb); 1273 ihl = iph->ihl * 4; 1274 if (ihl < sizeof(*iph)) 1275 goto out; 1276 1277 id = ntohs(iph->id); 1278 proto = iph->protocol; 1279 1280 /* Warning: after this point, iph might be no longer valid */ 1281 if (unlikely(!pskb_may_pull(skb, ihl))) 1282 goto out; 1283 __skb_pull(skb, ihl); 1284 1285 encap = SKB_GSO_CB(skb)->encap_level > 0; 1286 if (encap) 1287 features = skb->dev->hw_enc_features & netif_skb_features(skb); 1288 SKB_GSO_CB(skb)->encap_level += ihl; 1289 1290 skb_reset_transport_header(skb); 1291 1292 segs = ERR_PTR(-EPROTONOSUPPORT); 1293 1294 if (skb->encapsulation && 1295 skb_shinfo(skb)->gso_type & (SKB_GSO_SIT|SKB_GSO_IPIP)) 1296 udpfrag = proto == IPPROTO_UDP && encap; 1297 else 1298 udpfrag = proto == IPPROTO_UDP && !skb->encapsulation; 1299 1300 ops = rcu_dereference(inet_offloads[proto]); 1301 if (likely(ops && ops->callbacks.gso_segment)) 1302 segs = ops->callbacks.gso_segment(skb, features); 1303 1304 if (IS_ERR_OR_NULL(segs)) 1305 goto out; 1306 1307 skb = segs; 1308 do { 1309 iph = (struct iphdr *)(skb_mac_header(skb) + nhoff); 1310 if (udpfrag) { 1311 iph->id = htons(id); 1312 iph->frag_off = htons(offset >> 3); 1313 if (skb->next != NULL) 1314 iph->frag_off |= htons(IP_MF); 1315 offset += skb->len - nhoff - ihl; 1316 } else { 1317 iph->id = htons(id++); 1318 } 1319 iph->tot_len = htons(skb->len - nhoff); 1320 ip_send_check(iph); 1321 if (encap) 1322 skb_reset_inner_headers(skb); 1323 skb->network_header = (u8 *)iph - skb->head; 1324 } while ((skb = skb->next)); 1325 1326 out: 1327 return segs; 1328 } 1329 1330 static struct sk_buff **inet_gro_receive(struct sk_buff **head, 1331 struct sk_buff *skb) 1332 { 1333 const struct net_offload *ops; 1334 struct sk_buff **pp = NULL; 1335 struct sk_buff *p; 1336 const struct iphdr *iph; 1337 unsigned int hlen; 1338 unsigned int off; 1339 unsigned int id; 1340 int flush = 1; 1341 int proto; 1342 1343 off = skb_gro_offset(skb); 1344 hlen = off + sizeof(*iph); 1345 iph = skb_gro_header_fast(skb, off); 1346 if (skb_gro_header_hard(skb, hlen)) { 1347 iph = skb_gro_header_slow(skb, hlen, off); 1348 if (unlikely(!iph)) 1349 goto out; 1350 } 1351 1352 proto = iph->protocol; 1353 1354 rcu_read_lock(); 1355 ops = rcu_dereference(inet_offloads[proto]); 1356 if (!ops || !ops->callbacks.gro_receive) 1357 goto out_unlock; 1358 1359 if (*(u8 *)iph != 0x45) 1360 goto out_unlock; 1361 1362 if (unlikely(ip_fast_csum((u8 *)iph, 5))) 1363 goto out_unlock; 1364 1365 id = ntohl(*(__be32 *)&iph->id); 1366 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF)); 1367 id >>= 16; 1368 1369 for (p = *head; p; p = p->next) { 1370 struct iphdr *iph2; 1371 1372 if (!NAPI_GRO_CB(p)->same_flow) 1373 continue; 1374 1375 iph2 = (struct iphdr *)(p->data + off); 1376 /* The above works because, with the exception of the top 1377 * (inner most) layer, we only aggregate pkts with the same 1378 * hdr length so all the hdrs we'll need to verify will start 1379 * at the same offset. 1380 */ 1381 if ((iph->protocol ^ iph2->protocol) | 1382 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) | 1383 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) { 1384 NAPI_GRO_CB(p)->same_flow = 0; 1385 continue; 1386 } 1387 1388 /* All fields must match except length and checksum. */ 1389 NAPI_GRO_CB(p)->flush |= 1390 (iph->ttl ^ iph2->ttl) | 1391 (iph->tos ^ iph2->tos) | 1392 ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF)); 1393 1394 /* Save the IP ID check to be included later when we get to 1395 * the transport layer so only the inner most IP ID is checked. 1396 * This is because some GSO/TSO implementations do not 1397 * correctly increment the IP ID for the outer hdrs. 1398 */ 1399 NAPI_GRO_CB(p)->flush_id = 1400 ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id); 1401 NAPI_GRO_CB(p)->flush |= flush; 1402 } 1403 1404 NAPI_GRO_CB(skb)->flush |= flush; 1405 skb_set_network_header(skb, off); 1406 /* The above will be needed by the transport layer if there is one 1407 * immediately following this IP hdr. 1408 */ 1409 1410 skb_gro_pull(skb, sizeof(*iph)); 1411 skb_set_transport_header(skb, skb_gro_offset(skb)); 1412 1413 pp = ops->callbacks.gro_receive(head, skb); 1414 1415 out_unlock: 1416 rcu_read_unlock(); 1417 1418 out: 1419 NAPI_GRO_CB(skb)->flush |= flush; 1420 1421 return pp; 1422 } 1423 1424 static int inet_gro_complete(struct sk_buff *skb, int nhoff) 1425 { 1426 __be16 newlen = htons(skb->len - nhoff); 1427 struct iphdr *iph = (struct iphdr *)(skb->data + nhoff); 1428 const struct net_offload *ops; 1429 int proto = iph->protocol; 1430 int err = -ENOSYS; 1431 1432 csum_replace2(&iph->check, iph->tot_len, newlen); 1433 iph->tot_len = newlen; 1434 1435 rcu_read_lock(); 1436 ops = rcu_dereference(inet_offloads[proto]); 1437 if (WARN_ON(!ops || !ops->callbacks.gro_complete)) 1438 goto out_unlock; 1439 1440 /* Only need to add sizeof(*iph) to get to the next hdr below 1441 * because any hdr with option will have been flushed in 1442 * inet_gro_receive(). 1443 */ 1444 err = ops->callbacks.gro_complete(skb, nhoff + sizeof(*iph)); 1445 1446 out_unlock: 1447 rcu_read_unlock(); 1448 1449 return err; 1450 } 1451 1452 int inet_ctl_sock_create(struct sock **sk, unsigned short family, 1453 unsigned short type, unsigned char protocol, 1454 struct net *net) 1455 { 1456 struct socket *sock; 1457 int rc = sock_create_kern(family, type, protocol, &sock); 1458 1459 if (rc == 0) { 1460 *sk = sock->sk; 1461 (*sk)->sk_allocation = GFP_ATOMIC; 1462 /* 1463 * Unhash it so that IP input processing does not even see it, 1464 * we do not wish this socket to see incoming packets. 1465 */ 1466 (*sk)->sk_prot->unhash(*sk); 1467 1468 sk_change_net(*sk, net); 1469 } 1470 return rc; 1471 } 1472 EXPORT_SYMBOL_GPL(inet_ctl_sock_create); 1473 1474 unsigned long snmp_fold_field(void __percpu *mib, int offt) 1475 { 1476 unsigned long res = 0; 1477 int i; 1478 1479 for_each_possible_cpu(i) 1480 res += *(((unsigned long *) per_cpu_ptr(mib, i)) + offt); 1481 return res; 1482 } 1483 EXPORT_SYMBOL_GPL(snmp_fold_field); 1484 1485 #if BITS_PER_LONG==32 1486 1487 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset) 1488 { 1489 u64 res = 0; 1490 int cpu; 1491 1492 for_each_possible_cpu(cpu) { 1493 void *bhptr; 1494 struct u64_stats_sync *syncp; 1495 u64 v; 1496 unsigned int start; 1497 1498 bhptr = per_cpu_ptr(mib, cpu); 1499 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset); 1500 do { 1501 start = u64_stats_fetch_begin_irq(syncp); 1502 v = *(((u64 *) bhptr) + offt); 1503 } while (u64_stats_fetch_retry_irq(syncp, start)); 1504 1505 res += v; 1506 } 1507 return res; 1508 } 1509 EXPORT_SYMBOL_GPL(snmp_fold_field64); 1510 #endif 1511 1512 #ifdef CONFIG_IP_MULTICAST 1513 static const struct net_protocol igmp_protocol = { 1514 .handler = igmp_rcv, 1515 .netns_ok = 1, 1516 }; 1517 #endif 1518 1519 static const struct net_protocol tcp_protocol = { 1520 .early_demux = tcp_v4_early_demux, 1521 .handler = tcp_v4_rcv, 1522 .err_handler = tcp_v4_err, 1523 .no_policy = 1, 1524 .netns_ok = 1, 1525 .icmp_strict_tag_validation = 1, 1526 }; 1527 1528 static const struct net_protocol udp_protocol = { 1529 .early_demux = udp_v4_early_demux, 1530 .handler = udp_rcv, 1531 .err_handler = udp_err, 1532 .no_policy = 1, 1533 .netns_ok = 1, 1534 }; 1535 1536 static const struct net_protocol icmp_protocol = { 1537 .handler = icmp_rcv, 1538 .err_handler = icmp_err, 1539 .no_policy = 1, 1540 .netns_ok = 1, 1541 }; 1542 1543 static __net_init int ipv4_mib_init_net(struct net *net) 1544 { 1545 int i; 1546 1547 net->mib.tcp_statistics = alloc_percpu(struct tcp_mib); 1548 if (!net->mib.tcp_statistics) 1549 goto err_tcp_mib; 1550 net->mib.ip_statistics = alloc_percpu(struct ipstats_mib); 1551 if (!net->mib.ip_statistics) 1552 goto err_ip_mib; 1553 1554 for_each_possible_cpu(i) { 1555 struct ipstats_mib *af_inet_stats; 1556 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i); 1557 u64_stats_init(&af_inet_stats->syncp); 1558 } 1559 1560 net->mib.net_statistics = alloc_percpu(struct linux_mib); 1561 if (!net->mib.net_statistics) 1562 goto err_net_mib; 1563 net->mib.udp_statistics = alloc_percpu(struct udp_mib); 1564 if (!net->mib.udp_statistics) 1565 goto err_udp_mib; 1566 net->mib.udplite_statistics = alloc_percpu(struct udp_mib); 1567 if (!net->mib.udplite_statistics) 1568 goto err_udplite_mib; 1569 net->mib.icmp_statistics = alloc_percpu(struct icmp_mib); 1570 if (!net->mib.icmp_statistics) 1571 goto err_icmp_mib; 1572 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib), 1573 GFP_KERNEL); 1574 if (!net->mib.icmpmsg_statistics) 1575 goto err_icmpmsg_mib; 1576 1577 tcp_mib_init(net); 1578 return 0; 1579 1580 err_icmpmsg_mib: 1581 free_percpu(net->mib.icmp_statistics); 1582 err_icmp_mib: 1583 free_percpu(net->mib.udplite_statistics); 1584 err_udplite_mib: 1585 free_percpu(net->mib.udp_statistics); 1586 err_udp_mib: 1587 free_percpu(net->mib.net_statistics); 1588 err_net_mib: 1589 free_percpu(net->mib.ip_statistics); 1590 err_ip_mib: 1591 free_percpu(net->mib.tcp_statistics); 1592 err_tcp_mib: 1593 return -ENOMEM; 1594 } 1595 1596 static __net_exit void ipv4_mib_exit_net(struct net *net) 1597 { 1598 kfree(net->mib.icmpmsg_statistics); 1599 free_percpu(net->mib.icmp_statistics); 1600 free_percpu(net->mib.udplite_statistics); 1601 free_percpu(net->mib.udp_statistics); 1602 free_percpu(net->mib.net_statistics); 1603 free_percpu(net->mib.ip_statistics); 1604 free_percpu(net->mib.tcp_statistics); 1605 } 1606 1607 static __net_initdata struct pernet_operations ipv4_mib_ops = { 1608 .init = ipv4_mib_init_net, 1609 .exit = ipv4_mib_exit_net, 1610 }; 1611 1612 static int __init init_ipv4_mibs(void) 1613 { 1614 return register_pernet_subsys(&ipv4_mib_ops); 1615 } 1616 1617 static __net_init int inet_init_net(struct net *net) 1618 { 1619 /* 1620 * Set defaults for local port range 1621 */ 1622 seqlock_init(&net->ipv4.ip_local_ports.lock); 1623 net->ipv4.ip_local_ports.range[0] = 32768; 1624 net->ipv4.ip_local_ports.range[1] = 61000; 1625 1626 seqlock_init(&net->ipv4.ping_group_range.lock); 1627 /* 1628 * Sane defaults - nobody may create ping sockets. 1629 * Boot scripts should set this to distro-specific group. 1630 */ 1631 net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1); 1632 net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0); 1633 return 0; 1634 } 1635 1636 static __net_exit void inet_exit_net(struct net *net) 1637 { 1638 } 1639 1640 static __net_initdata struct pernet_operations af_inet_ops = { 1641 .init = inet_init_net, 1642 .exit = inet_exit_net, 1643 }; 1644 1645 static int __init init_inet_pernet_ops(void) 1646 { 1647 return register_pernet_subsys(&af_inet_ops); 1648 } 1649 1650 static int ipv4_proc_init(void); 1651 1652 /* 1653 * IP protocol layer initialiser 1654 */ 1655 1656 static struct packet_offload ip_packet_offload __read_mostly = { 1657 .type = cpu_to_be16(ETH_P_IP), 1658 .callbacks = { 1659 .gso_send_check = inet_gso_send_check, 1660 .gso_segment = inet_gso_segment, 1661 .gro_receive = inet_gro_receive, 1662 .gro_complete = inet_gro_complete, 1663 }, 1664 }; 1665 1666 static const struct net_offload ipip_offload = { 1667 .callbacks = { 1668 .gso_send_check = inet_gso_send_check, 1669 .gso_segment = inet_gso_segment, 1670 }, 1671 }; 1672 1673 static int __init ipv4_offload_init(void) 1674 { 1675 /* 1676 * Add offloads 1677 */ 1678 if (udpv4_offload_init() < 0) 1679 pr_crit("%s: Cannot add UDP protocol offload\n", __func__); 1680 if (tcpv4_offload_init() < 0) 1681 pr_crit("%s: Cannot add TCP protocol offload\n", __func__); 1682 1683 dev_add_offload(&ip_packet_offload); 1684 inet_add_offload(&ipip_offload, IPPROTO_IPIP); 1685 return 0; 1686 } 1687 1688 fs_initcall(ipv4_offload_init); 1689 1690 static struct packet_type ip_packet_type __read_mostly = { 1691 .type = cpu_to_be16(ETH_P_IP), 1692 .func = ip_rcv, 1693 }; 1694 1695 static int __init inet_init(void) 1696 { 1697 struct inet_protosw *q; 1698 struct list_head *r; 1699 int rc = -EINVAL; 1700 1701 BUILD_BUG_ON(sizeof(struct inet_skb_parm) > FIELD_SIZEOF(struct sk_buff, cb)); 1702 1703 rc = proto_register(&tcp_prot, 1); 1704 if (rc) 1705 goto out; 1706 1707 rc = proto_register(&udp_prot, 1); 1708 if (rc) 1709 goto out_unregister_tcp_proto; 1710 1711 rc = proto_register(&raw_prot, 1); 1712 if (rc) 1713 goto out_unregister_udp_proto; 1714 1715 rc = proto_register(&ping_prot, 1); 1716 if (rc) 1717 goto out_unregister_raw_proto; 1718 1719 /* 1720 * Tell SOCKET that we are alive... 1721 */ 1722 1723 (void)sock_register(&inet_family_ops); 1724 1725 #ifdef CONFIG_SYSCTL 1726 ip_static_sysctl_init(); 1727 #endif 1728 1729 /* 1730 * Add all the base protocols. 1731 */ 1732 1733 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 1734 pr_crit("%s: Cannot add ICMP protocol\n", __func__); 1735 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) 1736 pr_crit("%s: Cannot add UDP protocol\n", __func__); 1737 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) 1738 pr_crit("%s: Cannot add TCP protocol\n", __func__); 1739 #ifdef CONFIG_IP_MULTICAST 1740 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 1741 pr_crit("%s: Cannot add IGMP protocol\n", __func__); 1742 #endif 1743 1744 /* Register the socket-side information for inet_create. */ 1745 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 1746 INIT_LIST_HEAD(r); 1747 1748 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 1749 inet_register_protosw(q); 1750 1751 /* 1752 * Set the ARP module up 1753 */ 1754 1755 arp_init(); 1756 1757 /* 1758 * Set the IP module up 1759 */ 1760 1761 ip_init(); 1762 1763 tcp_v4_init(); 1764 1765 /* Setup TCP slab cache for open requests. */ 1766 tcp_init(); 1767 1768 /* Setup UDP memory threshold */ 1769 udp_init(); 1770 1771 /* Add UDP-Lite (RFC 3828) */ 1772 udplite4_register(); 1773 1774 ping_init(); 1775 1776 /* 1777 * Set the ICMP layer up 1778 */ 1779 1780 if (icmp_init() < 0) 1781 panic("Failed to create the ICMP control socket.\n"); 1782 1783 /* 1784 * Initialise the multicast router 1785 */ 1786 #if defined(CONFIG_IP_MROUTE) 1787 if (ip_mr_init()) 1788 pr_crit("%s: Cannot init ipv4 mroute\n", __func__); 1789 #endif 1790 1791 if (init_inet_pernet_ops()) 1792 pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__); 1793 /* 1794 * Initialise per-cpu ipv4 mibs 1795 */ 1796 1797 if (init_ipv4_mibs()) 1798 pr_crit("%s: Cannot init ipv4 mibs\n", __func__); 1799 1800 ipv4_proc_init(); 1801 1802 ipfrag_init(); 1803 1804 dev_add_pack(&ip_packet_type); 1805 1806 rc = 0; 1807 out: 1808 return rc; 1809 out_unregister_raw_proto: 1810 proto_unregister(&raw_prot); 1811 out_unregister_udp_proto: 1812 proto_unregister(&udp_prot); 1813 out_unregister_tcp_proto: 1814 proto_unregister(&tcp_prot); 1815 goto out; 1816 } 1817 1818 fs_initcall(inet_init); 1819 1820 /* ------------------------------------------------------------------------ */ 1821 1822 #ifdef CONFIG_PROC_FS 1823 static int __init ipv4_proc_init(void) 1824 { 1825 int rc = 0; 1826 1827 if (raw_proc_init()) 1828 goto out_raw; 1829 if (tcp4_proc_init()) 1830 goto out_tcp; 1831 if (udp4_proc_init()) 1832 goto out_udp; 1833 if (ping_proc_init()) 1834 goto out_ping; 1835 if (ip_misc_proc_init()) 1836 goto out_misc; 1837 out: 1838 return rc; 1839 out_misc: 1840 ping_proc_exit(); 1841 out_ping: 1842 udp4_proc_exit(); 1843 out_udp: 1844 tcp4_proc_exit(); 1845 out_tcp: 1846 raw_proc_exit(); 1847 out_raw: 1848 rc = -ENOMEM; 1849 goto out; 1850 } 1851 1852 #else /* CONFIG_PROC_FS */ 1853 static int __init ipv4_proc_init(void) 1854 { 1855 return 0; 1856 } 1857 #endif /* CONFIG_PROC_FS */ 1858 1859 MODULE_ALIAS_NETPROTO(PF_INET); 1860 1861