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) { 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 tcp_fastopen_init_key_once(true); 233 } 234 err = inet_csk_listen_start(sk, backlog); 235 if (err) 236 goto out; 237 } 238 sk->sk_max_ack_backlog = backlog; 239 err = 0; 240 241 out: 242 release_sock(sk); 243 return err; 244 } 245 EXPORT_SYMBOL(inet_listen); 246 247 /* 248 * Create an inet socket. 249 */ 250 251 static int inet_create(struct net *net, struct socket *sock, int protocol, 252 int kern) 253 { 254 struct sock *sk; 255 struct inet_protosw *answer; 256 struct inet_sock *inet; 257 struct proto *answer_prot; 258 unsigned char answer_flags; 259 int try_loading_module = 0; 260 int err; 261 262 sock->state = SS_UNCONNECTED; 263 264 /* Look for the requested type/protocol pair. */ 265 lookup_protocol: 266 err = -ESOCKTNOSUPPORT; 267 rcu_read_lock(); 268 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) { 269 270 err = 0; 271 /* Check the non-wild match. */ 272 if (protocol == answer->protocol) { 273 if (protocol != IPPROTO_IP) 274 break; 275 } else { 276 /* Check for the two wild cases. */ 277 if (IPPROTO_IP == protocol) { 278 protocol = answer->protocol; 279 break; 280 } 281 if (IPPROTO_IP == answer->protocol) 282 break; 283 } 284 err = -EPROTONOSUPPORT; 285 } 286 287 if (unlikely(err)) { 288 if (try_loading_module < 2) { 289 rcu_read_unlock(); 290 /* 291 * Be more specific, e.g. net-pf-2-proto-132-type-1 292 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) 293 */ 294 if (++try_loading_module == 1) 295 request_module("net-pf-%d-proto-%d-type-%d", 296 PF_INET, protocol, sock->type); 297 /* 298 * Fall back to generic, e.g. net-pf-2-proto-132 299 * (net-pf-PF_INET-proto-IPPROTO_SCTP) 300 */ 301 else 302 request_module("net-pf-%d-proto-%d", 303 PF_INET, protocol); 304 goto lookup_protocol; 305 } else 306 goto out_rcu_unlock; 307 } 308 309 err = -EPERM; 310 if (sock->type == SOCK_RAW && !kern && 311 !ns_capable(net->user_ns, CAP_NET_RAW)) 312 goto out_rcu_unlock; 313 314 sock->ops = answer->ops; 315 answer_prot = answer->prot; 316 answer_flags = answer->flags; 317 rcu_read_unlock(); 318 319 WARN_ON(!answer_prot->slab); 320 321 err = -ENOBUFS; 322 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot, kern); 323 if (!sk) 324 goto out; 325 326 err = 0; 327 if (INET_PROTOSW_REUSE & answer_flags) 328 sk->sk_reuse = SK_CAN_REUSE; 329 330 inet = inet_sk(sk); 331 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 332 333 inet->nodefrag = 0; 334 335 if (SOCK_RAW == sock->type) { 336 inet->inet_num = protocol; 337 if (IPPROTO_RAW == protocol) 338 inet->hdrincl = 1; 339 } 340 341 if (net->ipv4.sysctl_ip_no_pmtu_disc) 342 inet->pmtudisc = IP_PMTUDISC_DONT; 343 else 344 inet->pmtudisc = IP_PMTUDISC_WANT; 345 346 inet->inet_id = 0; 347 348 sock_init_data(sock, sk); 349 350 sk->sk_destruct = inet_sock_destruct; 351 sk->sk_protocol = protocol; 352 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 353 354 inet->uc_ttl = -1; 355 inet->mc_loop = 1; 356 inet->mc_ttl = 1; 357 inet->mc_all = 1; 358 inet->mc_index = 0; 359 inet->mc_list = NULL; 360 inet->rcv_tos = 0; 361 362 sk_refcnt_debug_inc(sk); 363 364 if (inet->inet_num) { 365 /* It assumes that any protocol which allows 366 * the user to assign a number at socket 367 * creation time automatically 368 * shares. 369 */ 370 inet->inet_sport = htons(inet->inet_num); 371 /* Add to protocol hash chains. */ 372 sk->sk_prot->hash(sk); 373 } 374 375 if (sk->sk_prot->init) { 376 err = sk->sk_prot->init(sk); 377 if (err) 378 sk_common_release(sk); 379 } 380 out: 381 return err; 382 out_rcu_unlock: 383 rcu_read_unlock(); 384 goto out; 385 } 386 387 388 /* 389 * The peer socket should always be NULL (or else). When we call this 390 * function we are destroying the object and from then on nobody 391 * should refer to it. 392 */ 393 int inet_release(struct socket *sock) 394 { 395 struct sock *sk = sock->sk; 396 397 if (sk) { 398 long timeout; 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 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 422 { 423 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 424 struct sock *sk = sock->sk; 425 struct inet_sock *inet = inet_sk(sk); 426 struct net *net = sock_net(sk); 427 unsigned short snum; 428 int chk_addr_ret; 429 int err; 430 431 /* If the socket has its own bind function then use it. (RAW) */ 432 if (sk->sk_prot->bind) { 433 err = sk->sk_prot->bind(sk, uaddr, addr_len); 434 goto out; 435 } 436 err = -EINVAL; 437 if (addr_len < sizeof(struct sockaddr_in)) 438 goto out; 439 440 if (addr->sin_family != AF_INET) { 441 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET) 442 * only if s_addr is INADDR_ANY. 443 */ 444 err = -EAFNOSUPPORT; 445 if (addr->sin_family != AF_UNSPEC || 446 addr->sin_addr.s_addr != htonl(INADDR_ANY)) 447 goto out; 448 } 449 450 chk_addr_ret = inet_addr_type(net, addr->sin_addr.s_addr); 451 452 /* Not specified by any standard per-se, however it breaks too 453 * many applications when removed. It is unfortunate since 454 * allowing applications to make a non-local bind solves 455 * several problems with systems using dynamic addressing. 456 * (ie. your servers still start up even if your ISDN link 457 * is temporarily down) 458 */ 459 err = -EADDRNOTAVAIL; 460 if (!net->ipv4.sysctl_ip_nonlocal_bind && 461 !(inet->freebind || inet->transparent) && 462 addr->sin_addr.s_addr != htonl(INADDR_ANY) && 463 chk_addr_ret != RTN_LOCAL && 464 chk_addr_ret != RTN_MULTICAST && 465 chk_addr_ret != RTN_BROADCAST) 466 goto out; 467 468 snum = ntohs(addr->sin_port); 469 err = -EACCES; 470 if (snum && snum < PROT_SOCK && 471 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 472 goto out; 473 474 /* We keep a pair of addresses. rcv_saddr is the one 475 * used by hash lookups, and saddr is used for transmit. 476 * 477 * In the BSD API these are the same except where it 478 * would be illegal to use them (multicast/broadcast) in 479 * which case the sending device address is used. 480 */ 481 lock_sock(sk); 482 483 /* Check these errors (active socket, double bind). */ 484 err = -EINVAL; 485 if (sk->sk_state != TCP_CLOSE || inet->inet_num) 486 goto out_release_sock; 487 488 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 489 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 490 inet->inet_saddr = 0; /* Use device */ 491 492 /* Make sure we are allowed to bind here. */ 493 if ((snum || !inet->bind_address_no_port) && 494 sk->sk_prot->get_port(sk, snum)) { 495 inet->inet_saddr = inet->inet_rcv_saddr = 0; 496 err = -EADDRINUSE; 497 goto out_release_sock; 498 } 499 500 if (inet->inet_rcv_saddr) 501 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 502 if (snum) 503 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 504 inet->inet_sport = htons(inet->inet_num); 505 inet->inet_daddr = 0; 506 inet->inet_dport = 0; 507 sk_dst_reset(sk); 508 err = 0; 509 out_release_sock: 510 release_sock(sk); 511 out: 512 return err; 513 } 514 EXPORT_SYMBOL(inet_bind); 515 516 int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr, 517 int addr_len, int flags) 518 { 519 struct sock *sk = sock->sk; 520 521 if (addr_len < sizeof(uaddr->sa_family)) 522 return -EINVAL; 523 if (uaddr->sa_family == AF_UNSPEC) 524 return sk->sk_prot->disconnect(sk, flags); 525 526 if (!inet_sk(sk)->inet_num && inet_autobind(sk)) 527 return -EAGAIN; 528 return sk->sk_prot->connect(sk, uaddr, addr_len); 529 } 530 EXPORT_SYMBOL(inet_dgram_connect); 531 532 static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias) 533 { 534 DEFINE_WAIT(wait); 535 536 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 537 sk->sk_write_pending += writebias; 538 539 /* Basic assumption: if someone sets sk->sk_err, he _must_ 540 * change state of the socket from TCP_SYN_*. 541 * Connect() does not allow to get error notifications 542 * without closing the socket. 543 */ 544 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 545 release_sock(sk); 546 timeo = schedule_timeout(timeo); 547 lock_sock(sk); 548 if (signal_pending(current) || !timeo) 549 break; 550 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 551 } 552 finish_wait(sk_sleep(sk), &wait); 553 sk->sk_write_pending -= writebias; 554 return timeo; 555 } 556 557 /* 558 * Connect to a remote host. There is regrettably still a little 559 * TCP 'magic' in here. 560 */ 561 int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 562 int addr_len, int flags) 563 { 564 struct sock *sk = sock->sk; 565 int err; 566 long timeo; 567 568 if (addr_len < sizeof(uaddr->sa_family)) 569 return -EINVAL; 570 571 if (uaddr->sa_family == AF_UNSPEC) { 572 err = sk->sk_prot->disconnect(sk, flags); 573 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 574 goto out; 575 } 576 577 switch (sock->state) { 578 default: 579 err = -EINVAL; 580 goto out; 581 case SS_CONNECTED: 582 err = -EISCONN; 583 goto out; 584 case SS_CONNECTING: 585 err = -EALREADY; 586 /* Fall out of switch with err, set for this state */ 587 break; 588 case SS_UNCONNECTED: 589 err = -EISCONN; 590 if (sk->sk_state != TCP_CLOSE) 591 goto out; 592 593 err = sk->sk_prot->connect(sk, uaddr, addr_len); 594 if (err < 0) 595 goto out; 596 597 sock->state = SS_CONNECTING; 598 599 /* Just entered SS_CONNECTING state; the only 600 * difference is that return value in non-blocking 601 * case is EINPROGRESS, rather than EALREADY. 602 */ 603 err = -EINPROGRESS; 604 break; 605 } 606 607 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 608 609 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 610 int writebias = (sk->sk_protocol == IPPROTO_TCP) && 611 tcp_sk(sk)->fastopen_req && 612 tcp_sk(sk)->fastopen_req->data ? 1 : 0; 613 614 /* Error code is set above */ 615 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias)) 616 goto out; 617 618 err = sock_intr_errno(timeo); 619 if (signal_pending(current)) 620 goto out; 621 } 622 623 /* Connection was closed by RST, timeout, ICMP error 624 * or another process disconnected us. 625 */ 626 if (sk->sk_state == TCP_CLOSE) 627 goto sock_error; 628 629 /* sk->sk_err may be not zero now, if RECVERR was ordered by user 630 * and error was received after socket entered established state. 631 * Hence, it is handled normally after connect() return successfully. 632 */ 633 634 sock->state = SS_CONNECTED; 635 err = 0; 636 out: 637 return err; 638 639 sock_error: 640 err = sock_error(sk) ? : -ECONNABORTED; 641 sock->state = SS_UNCONNECTED; 642 if (sk->sk_prot->disconnect(sk, flags)) 643 sock->state = SS_DISCONNECTING; 644 goto out; 645 } 646 EXPORT_SYMBOL(__inet_stream_connect); 647 648 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 649 int addr_len, int flags) 650 { 651 int err; 652 653 lock_sock(sock->sk); 654 err = __inet_stream_connect(sock, uaddr, addr_len, flags); 655 release_sock(sock->sk); 656 return err; 657 } 658 EXPORT_SYMBOL(inet_stream_connect); 659 660 /* 661 * Accept a pending connection. The TCP layer now gives BSD semantics. 662 */ 663 664 int inet_accept(struct socket *sock, struct socket *newsock, int flags) 665 { 666 struct sock *sk1 = sock->sk; 667 int err = -EINVAL; 668 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err); 669 670 if (!sk2) 671 goto do_err; 672 673 lock_sock(sk2); 674 675 sock_rps_record_flow(sk2); 676 WARN_ON(!((1 << sk2->sk_state) & 677 (TCPF_ESTABLISHED | TCPF_SYN_RECV | 678 TCPF_CLOSE_WAIT | TCPF_CLOSE))); 679 680 sock_graft(sk2, newsock); 681 682 newsock->state = SS_CONNECTED; 683 err = 0; 684 release_sock(sk2); 685 do_err: 686 return err; 687 } 688 EXPORT_SYMBOL(inet_accept); 689 690 691 /* 692 * This does both peername and sockname. 693 */ 694 int inet_getname(struct socket *sock, struct sockaddr *uaddr, 695 int *uaddr_len, int peer) 696 { 697 struct sock *sk = sock->sk; 698 struct inet_sock *inet = inet_sk(sk); 699 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr); 700 701 sin->sin_family = AF_INET; 702 if (peer) { 703 if (!inet->inet_dport || 704 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 705 peer == 1)) 706 return -ENOTCONN; 707 sin->sin_port = inet->inet_dport; 708 sin->sin_addr.s_addr = inet->inet_daddr; 709 } else { 710 __be32 addr = inet->inet_rcv_saddr; 711 if (!addr) 712 addr = inet->inet_saddr; 713 sin->sin_port = inet->inet_sport; 714 sin->sin_addr.s_addr = addr; 715 } 716 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 717 *uaddr_len = sizeof(*sin); 718 return 0; 719 } 720 EXPORT_SYMBOL(inet_getname); 721 722 int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) 723 { 724 struct sock *sk = sock->sk; 725 726 sock_rps_record_flow(sk); 727 728 /* We may need to bind the socket. */ 729 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 730 inet_autobind(sk)) 731 return -EAGAIN; 732 733 return sk->sk_prot->sendmsg(sk, msg, size); 734 } 735 EXPORT_SYMBOL(inet_sendmsg); 736 737 ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, 738 size_t size, int flags) 739 { 740 struct sock *sk = sock->sk; 741 742 sock_rps_record_flow(sk); 743 744 /* We may need to bind the socket. */ 745 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 746 inet_autobind(sk)) 747 return -EAGAIN; 748 749 if (sk->sk_prot->sendpage) 750 return sk->sk_prot->sendpage(sk, page, offset, size, flags); 751 return sock_no_sendpage(sock, page, offset, size, flags); 752 } 753 EXPORT_SYMBOL(inet_sendpage); 754 755 int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 756 int flags) 757 { 758 struct sock *sk = sock->sk; 759 int addr_len = 0; 760 int err; 761 762 sock_rps_record_flow(sk); 763 764 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT, 765 flags & ~MSG_DONTWAIT, &addr_len); 766 if (err >= 0) 767 msg->msg_namelen = addr_len; 768 return err; 769 } 770 EXPORT_SYMBOL(inet_recvmsg); 771 772 int inet_shutdown(struct socket *sock, int how) 773 { 774 struct sock *sk = sock->sk; 775 int err = 0; 776 777 /* This should really check to make sure 778 * the socket is a TCP socket. (WHY AC...) 779 */ 780 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and 781 1->2 bit 2 snds. 782 2->3 */ 783 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ 784 return -EINVAL; 785 786 lock_sock(sk); 787 if (sock->state == SS_CONNECTING) { 788 if ((1 << sk->sk_state) & 789 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) 790 sock->state = SS_DISCONNECTING; 791 else 792 sock->state = SS_CONNECTED; 793 } 794 795 switch (sk->sk_state) { 796 case TCP_CLOSE: 797 err = -ENOTCONN; 798 /* Hack to wake up other listeners, who can poll for 799 POLLHUP, even on eg. unconnected UDP sockets -- RR */ 800 default: 801 sk->sk_shutdown |= how; 802 if (sk->sk_prot->shutdown) 803 sk->sk_prot->shutdown(sk, how); 804 break; 805 806 /* Remaining two branches are temporary solution for missing 807 * close() in multithreaded environment. It is _not_ a good idea, 808 * but we have no choice until close() is repaired at VFS level. 809 */ 810 case TCP_LISTEN: 811 if (!(how & RCV_SHUTDOWN)) 812 break; 813 /* Fall through */ 814 case TCP_SYN_SENT: 815 err = sk->sk_prot->disconnect(sk, O_NONBLOCK); 816 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 817 break; 818 } 819 820 /* Wake up anyone sleeping in poll. */ 821 sk->sk_state_change(sk); 822 release_sock(sk); 823 return err; 824 } 825 EXPORT_SYMBOL(inet_shutdown); 826 827 /* 828 * ioctl() calls you can issue on an INET socket. Most of these are 829 * device configuration and stuff and very rarely used. Some ioctls 830 * pass on to the socket itself. 831 * 832 * NOTE: I like the idea of a module for the config stuff. ie ifconfig 833 * loads the devconfigure module does its configuring and unloads it. 834 * There's a good 20K of config code hanging around the kernel. 835 */ 836 837 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 838 { 839 struct sock *sk = sock->sk; 840 int err = 0; 841 struct net *net = sock_net(sk); 842 843 switch (cmd) { 844 case SIOCGSTAMP: 845 err = sock_get_timestamp(sk, (struct timeval __user *)arg); 846 break; 847 case SIOCGSTAMPNS: 848 err = sock_get_timestampns(sk, (struct timespec __user *)arg); 849 break; 850 case SIOCADDRT: 851 case SIOCDELRT: 852 case SIOCRTMSG: 853 err = ip_rt_ioctl(net, cmd, (void __user *)arg); 854 break; 855 case SIOCDARP: 856 case SIOCGARP: 857 case SIOCSARP: 858 err = arp_ioctl(net, cmd, (void __user *)arg); 859 break; 860 case SIOCGIFADDR: 861 case SIOCSIFADDR: 862 case SIOCGIFBRDADDR: 863 case SIOCSIFBRDADDR: 864 case SIOCGIFNETMASK: 865 case SIOCSIFNETMASK: 866 case SIOCGIFDSTADDR: 867 case SIOCSIFDSTADDR: 868 case SIOCSIFPFLAGS: 869 case SIOCGIFPFLAGS: 870 case SIOCSIFFLAGS: 871 err = devinet_ioctl(net, cmd, (void __user *)arg); 872 break; 873 default: 874 if (sk->sk_prot->ioctl) 875 err = sk->sk_prot->ioctl(sk, cmd, arg); 876 else 877 err = -ENOIOCTLCMD; 878 break; 879 } 880 return err; 881 } 882 EXPORT_SYMBOL(inet_ioctl); 883 884 #ifdef CONFIG_COMPAT 885 static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 886 { 887 struct sock *sk = sock->sk; 888 int err = -ENOIOCTLCMD; 889 890 if (sk->sk_prot->compat_ioctl) 891 err = sk->sk_prot->compat_ioctl(sk, cmd, arg); 892 893 return err; 894 } 895 #endif 896 897 const struct proto_ops inet_stream_ops = { 898 .family = PF_INET, 899 .owner = THIS_MODULE, 900 .release = inet_release, 901 .bind = inet_bind, 902 .connect = inet_stream_connect, 903 .socketpair = sock_no_socketpair, 904 .accept = inet_accept, 905 .getname = inet_getname, 906 .poll = tcp_poll, 907 .ioctl = inet_ioctl, 908 .listen = inet_listen, 909 .shutdown = inet_shutdown, 910 .setsockopt = sock_common_setsockopt, 911 .getsockopt = sock_common_getsockopt, 912 .sendmsg = inet_sendmsg, 913 .recvmsg = inet_recvmsg, 914 .mmap = sock_no_mmap, 915 .sendpage = inet_sendpage, 916 .splice_read = tcp_splice_read, 917 #ifdef CONFIG_COMPAT 918 .compat_setsockopt = compat_sock_common_setsockopt, 919 .compat_getsockopt = compat_sock_common_getsockopt, 920 .compat_ioctl = inet_compat_ioctl, 921 #endif 922 }; 923 EXPORT_SYMBOL(inet_stream_ops); 924 925 const struct proto_ops inet_dgram_ops = { 926 .family = PF_INET, 927 .owner = THIS_MODULE, 928 .release = inet_release, 929 .bind = inet_bind, 930 .connect = inet_dgram_connect, 931 .socketpair = sock_no_socketpair, 932 .accept = sock_no_accept, 933 .getname = inet_getname, 934 .poll = udp_poll, 935 .ioctl = inet_ioctl, 936 .listen = sock_no_listen, 937 .shutdown = inet_shutdown, 938 .setsockopt = sock_common_setsockopt, 939 .getsockopt = sock_common_getsockopt, 940 .sendmsg = inet_sendmsg, 941 .recvmsg = inet_recvmsg, 942 .mmap = sock_no_mmap, 943 .sendpage = inet_sendpage, 944 #ifdef CONFIG_COMPAT 945 .compat_setsockopt = compat_sock_common_setsockopt, 946 .compat_getsockopt = compat_sock_common_getsockopt, 947 .compat_ioctl = inet_compat_ioctl, 948 #endif 949 }; 950 EXPORT_SYMBOL(inet_dgram_ops); 951 952 /* 953 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 954 * udp_poll 955 */ 956 static const struct proto_ops inet_sockraw_ops = { 957 .family = PF_INET, 958 .owner = THIS_MODULE, 959 .release = inet_release, 960 .bind = inet_bind, 961 .connect = inet_dgram_connect, 962 .socketpair = sock_no_socketpair, 963 .accept = sock_no_accept, 964 .getname = inet_getname, 965 .poll = datagram_poll, 966 .ioctl = inet_ioctl, 967 .listen = sock_no_listen, 968 .shutdown = inet_shutdown, 969 .setsockopt = sock_common_setsockopt, 970 .getsockopt = sock_common_getsockopt, 971 .sendmsg = inet_sendmsg, 972 .recvmsg = inet_recvmsg, 973 .mmap = sock_no_mmap, 974 .sendpage = inet_sendpage, 975 #ifdef CONFIG_COMPAT 976 .compat_setsockopt = compat_sock_common_setsockopt, 977 .compat_getsockopt = compat_sock_common_getsockopt, 978 .compat_ioctl = inet_compat_ioctl, 979 #endif 980 }; 981 982 static const struct net_proto_family inet_family_ops = { 983 .family = PF_INET, 984 .create = inet_create, 985 .owner = THIS_MODULE, 986 }; 987 988 /* Upon startup we insert all the elements in inetsw_array[] into 989 * the linked list inetsw. 990 */ 991 static struct inet_protosw inetsw_array[] = 992 { 993 { 994 .type = SOCK_STREAM, 995 .protocol = IPPROTO_TCP, 996 .prot = &tcp_prot, 997 .ops = &inet_stream_ops, 998 .flags = INET_PROTOSW_PERMANENT | 999 INET_PROTOSW_ICSK, 1000 }, 1001 1002 { 1003 .type = SOCK_DGRAM, 1004 .protocol = IPPROTO_UDP, 1005 .prot = &udp_prot, 1006 .ops = &inet_dgram_ops, 1007 .flags = INET_PROTOSW_PERMANENT, 1008 }, 1009 1010 { 1011 .type = SOCK_DGRAM, 1012 .protocol = IPPROTO_ICMP, 1013 .prot = &ping_prot, 1014 .ops = &inet_dgram_ops, 1015 .flags = INET_PROTOSW_REUSE, 1016 }, 1017 1018 { 1019 .type = SOCK_RAW, 1020 .protocol = IPPROTO_IP, /* wild card */ 1021 .prot = &raw_prot, 1022 .ops = &inet_sockraw_ops, 1023 .flags = INET_PROTOSW_REUSE, 1024 } 1025 }; 1026 1027 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) 1028 1029 void inet_register_protosw(struct inet_protosw *p) 1030 { 1031 struct list_head *lh; 1032 struct inet_protosw *answer; 1033 int protocol = p->protocol; 1034 struct list_head *last_perm; 1035 1036 spin_lock_bh(&inetsw_lock); 1037 1038 if (p->type >= SOCK_MAX) 1039 goto out_illegal; 1040 1041 /* If we are trying to override a permanent protocol, bail. */ 1042 answer = NULL; 1043 last_perm = &inetsw[p->type]; 1044 list_for_each(lh, &inetsw[p->type]) { 1045 answer = list_entry(lh, struct inet_protosw, list); 1046 1047 /* Check only the non-wild match. */ 1048 if (INET_PROTOSW_PERMANENT & answer->flags) { 1049 if (protocol == answer->protocol) 1050 break; 1051 last_perm = lh; 1052 } 1053 1054 answer = NULL; 1055 } 1056 if (answer) 1057 goto out_permanent; 1058 1059 /* Add the new entry after the last permanent entry if any, so that 1060 * the new entry does not override a permanent entry when matched with 1061 * a wild-card protocol. But it is allowed to override any existing 1062 * non-permanent entry. This means that when we remove this entry, the 1063 * system automatically returns to the old behavior. 1064 */ 1065 list_add_rcu(&p->list, last_perm); 1066 out: 1067 spin_unlock_bh(&inetsw_lock); 1068 1069 return; 1070 1071 out_permanent: 1072 pr_err("Attempt to override permanent protocol %d\n", protocol); 1073 goto out; 1074 1075 out_illegal: 1076 pr_err("Ignoring attempt to register invalid socket type %d\n", 1077 p->type); 1078 goto out; 1079 } 1080 EXPORT_SYMBOL(inet_register_protosw); 1081 1082 void inet_unregister_protosw(struct inet_protosw *p) 1083 { 1084 if (INET_PROTOSW_PERMANENT & p->flags) { 1085 pr_err("Attempt to unregister permanent protocol %d\n", 1086 p->protocol); 1087 } else { 1088 spin_lock_bh(&inetsw_lock); 1089 list_del_rcu(&p->list); 1090 spin_unlock_bh(&inetsw_lock); 1091 1092 synchronize_net(); 1093 } 1094 } 1095 EXPORT_SYMBOL(inet_unregister_protosw); 1096 1097 /* 1098 * Shall we try to damage output packets if routing dev changes? 1099 */ 1100 1101 int sysctl_ip_dynaddr __read_mostly; 1102 1103 static int inet_sk_reselect_saddr(struct sock *sk) 1104 { 1105 struct inet_sock *inet = inet_sk(sk); 1106 __be32 old_saddr = inet->inet_saddr; 1107 __be32 daddr = inet->inet_daddr; 1108 struct flowi4 *fl4; 1109 struct rtable *rt; 1110 __be32 new_saddr; 1111 struct ip_options_rcu *inet_opt; 1112 1113 inet_opt = rcu_dereference_protected(inet->inet_opt, 1114 sock_owned_by_user(sk)); 1115 if (inet_opt && inet_opt->opt.srr) 1116 daddr = inet_opt->opt.faddr; 1117 1118 /* Query new route. */ 1119 fl4 = &inet->cork.fl.u.ip4; 1120 rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk), 1121 sk->sk_bound_dev_if, sk->sk_protocol, 1122 inet->inet_sport, inet->inet_dport, sk); 1123 if (IS_ERR(rt)) 1124 return PTR_ERR(rt); 1125 1126 sk_setup_caps(sk, &rt->dst); 1127 1128 new_saddr = fl4->saddr; 1129 1130 if (new_saddr == old_saddr) 1131 return 0; 1132 1133 if (sysctl_ip_dynaddr > 1) { 1134 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n", 1135 __func__, &old_saddr, &new_saddr); 1136 } 1137 1138 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr; 1139 1140 /* 1141 * XXX The only one ugly spot where we need to 1142 * XXX really change the sockets identity after 1143 * XXX it has entered the hashes. -DaveM 1144 * 1145 * Besides that, it does not check for connection 1146 * uniqueness. Wait for troubles. 1147 */ 1148 __sk_prot_rehash(sk); 1149 return 0; 1150 } 1151 1152 int inet_sk_rebuild_header(struct sock *sk) 1153 { 1154 struct inet_sock *inet = inet_sk(sk); 1155 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); 1156 __be32 daddr; 1157 struct ip_options_rcu *inet_opt; 1158 struct flowi4 *fl4; 1159 int err; 1160 1161 /* Route is OK, nothing to do. */ 1162 if (rt) 1163 return 0; 1164 1165 /* Reroute. */ 1166 rcu_read_lock(); 1167 inet_opt = rcu_dereference(inet->inet_opt); 1168 daddr = inet->inet_daddr; 1169 if (inet_opt && inet_opt->opt.srr) 1170 daddr = inet_opt->opt.faddr; 1171 rcu_read_unlock(); 1172 fl4 = &inet->cork.fl.u.ip4; 1173 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr, 1174 inet->inet_dport, inet->inet_sport, 1175 sk->sk_protocol, RT_CONN_FLAGS(sk), 1176 sk->sk_bound_dev_if); 1177 if (!IS_ERR(rt)) { 1178 err = 0; 1179 sk_setup_caps(sk, &rt->dst); 1180 } else { 1181 err = PTR_ERR(rt); 1182 1183 /* Routing failed... */ 1184 sk->sk_route_caps = 0; 1185 /* 1186 * Other protocols have to map its equivalent state to TCP_SYN_SENT. 1187 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme 1188 */ 1189 if (!sysctl_ip_dynaddr || 1190 sk->sk_state != TCP_SYN_SENT || 1191 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 1192 (err = inet_sk_reselect_saddr(sk)) != 0) 1193 sk->sk_err_soft = -err; 1194 } 1195 1196 return err; 1197 } 1198 EXPORT_SYMBOL(inet_sk_rebuild_header); 1199 1200 static struct sk_buff *inet_gso_segment(struct sk_buff *skb, 1201 netdev_features_t features) 1202 { 1203 struct sk_buff *segs = ERR_PTR(-EINVAL); 1204 const struct net_offload *ops; 1205 unsigned int offset = 0; 1206 bool udpfrag, encap; 1207 struct iphdr *iph; 1208 int proto; 1209 int nhoff; 1210 int ihl; 1211 int id; 1212 1213 if (unlikely(skb_shinfo(skb)->gso_type & 1214 ~(SKB_GSO_TCPV4 | 1215 SKB_GSO_UDP | 1216 SKB_GSO_DODGY | 1217 SKB_GSO_TCP_ECN | 1218 SKB_GSO_GRE | 1219 SKB_GSO_GRE_CSUM | 1220 SKB_GSO_IPIP | 1221 SKB_GSO_SIT | 1222 SKB_GSO_TCPV6 | 1223 SKB_GSO_UDP_TUNNEL | 1224 SKB_GSO_UDP_TUNNEL_CSUM | 1225 SKB_GSO_TUNNEL_REMCSUM | 1226 0))) 1227 goto out; 1228 1229 skb_reset_network_header(skb); 1230 nhoff = skb_network_header(skb) - skb_mac_header(skb); 1231 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1232 goto out; 1233 1234 iph = ip_hdr(skb); 1235 ihl = iph->ihl * 4; 1236 if (ihl < sizeof(*iph)) 1237 goto out; 1238 1239 id = ntohs(iph->id); 1240 proto = iph->protocol; 1241 1242 /* Warning: after this point, iph might be no longer valid */ 1243 if (unlikely(!pskb_may_pull(skb, ihl))) 1244 goto out; 1245 __skb_pull(skb, ihl); 1246 1247 encap = SKB_GSO_CB(skb)->encap_level > 0; 1248 if (encap) 1249 features &= skb->dev->hw_enc_features; 1250 SKB_GSO_CB(skb)->encap_level += ihl; 1251 1252 skb_reset_transport_header(skb); 1253 1254 segs = ERR_PTR(-EPROTONOSUPPORT); 1255 1256 if (skb->encapsulation && 1257 skb_shinfo(skb)->gso_type & (SKB_GSO_SIT|SKB_GSO_IPIP)) 1258 udpfrag = proto == IPPROTO_UDP && encap; 1259 else 1260 udpfrag = proto == IPPROTO_UDP && !skb->encapsulation; 1261 1262 ops = rcu_dereference(inet_offloads[proto]); 1263 if (likely(ops && ops->callbacks.gso_segment)) 1264 segs = ops->callbacks.gso_segment(skb, features); 1265 1266 if (IS_ERR_OR_NULL(segs)) 1267 goto out; 1268 1269 skb = segs; 1270 do { 1271 iph = (struct iphdr *)(skb_mac_header(skb) + nhoff); 1272 if (udpfrag) { 1273 iph->id = htons(id); 1274 iph->frag_off = htons(offset >> 3); 1275 if (skb->next) 1276 iph->frag_off |= htons(IP_MF); 1277 offset += skb->len - nhoff - ihl; 1278 } else { 1279 iph->id = htons(id++); 1280 } 1281 iph->tot_len = htons(skb->len - nhoff); 1282 ip_send_check(iph); 1283 if (encap) 1284 skb_reset_inner_headers(skb); 1285 skb->network_header = (u8 *)iph - skb->head; 1286 } while ((skb = skb->next)); 1287 1288 out: 1289 return segs; 1290 } 1291 1292 static struct sk_buff **inet_gro_receive(struct sk_buff **head, 1293 struct sk_buff *skb) 1294 { 1295 const struct net_offload *ops; 1296 struct sk_buff **pp = NULL; 1297 struct sk_buff *p; 1298 const struct iphdr *iph; 1299 unsigned int hlen; 1300 unsigned int off; 1301 unsigned int id; 1302 int flush = 1; 1303 int proto; 1304 1305 off = skb_gro_offset(skb); 1306 hlen = off + sizeof(*iph); 1307 iph = skb_gro_header_fast(skb, off); 1308 if (skb_gro_header_hard(skb, hlen)) { 1309 iph = skb_gro_header_slow(skb, hlen, off); 1310 if (unlikely(!iph)) 1311 goto out; 1312 } 1313 1314 proto = iph->protocol; 1315 1316 rcu_read_lock(); 1317 ops = rcu_dereference(inet_offloads[proto]); 1318 if (!ops || !ops->callbacks.gro_receive) 1319 goto out_unlock; 1320 1321 if (*(u8 *)iph != 0x45) 1322 goto out_unlock; 1323 1324 if (unlikely(ip_fast_csum((u8 *)iph, 5))) 1325 goto out_unlock; 1326 1327 id = ntohl(*(__be32 *)&iph->id); 1328 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF)); 1329 id >>= 16; 1330 1331 for (p = *head; p; p = p->next) { 1332 struct iphdr *iph2; 1333 1334 if (!NAPI_GRO_CB(p)->same_flow) 1335 continue; 1336 1337 iph2 = (struct iphdr *)(p->data + off); 1338 /* The above works because, with the exception of the top 1339 * (inner most) layer, we only aggregate pkts with the same 1340 * hdr length so all the hdrs we'll need to verify will start 1341 * at the same offset. 1342 */ 1343 if ((iph->protocol ^ iph2->protocol) | 1344 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) | 1345 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) { 1346 NAPI_GRO_CB(p)->same_flow = 0; 1347 continue; 1348 } 1349 1350 /* All fields must match except length and checksum. */ 1351 NAPI_GRO_CB(p)->flush |= 1352 (iph->ttl ^ iph2->ttl) | 1353 (iph->tos ^ iph2->tos) | 1354 ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF)); 1355 1356 /* Save the IP ID check to be included later when we get to 1357 * the transport layer so only the inner most IP ID is checked. 1358 * This is because some GSO/TSO implementations do not 1359 * correctly increment the IP ID for the outer hdrs. 1360 */ 1361 NAPI_GRO_CB(p)->flush_id = 1362 ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id); 1363 NAPI_GRO_CB(p)->flush |= flush; 1364 } 1365 1366 NAPI_GRO_CB(skb)->flush |= flush; 1367 skb_set_network_header(skb, off); 1368 /* The above will be needed by the transport layer if there is one 1369 * immediately following this IP hdr. 1370 */ 1371 1372 /* Note : No need to call skb_gro_postpull_rcsum() here, 1373 * as we already checked checksum over ipv4 header was 0 1374 */ 1375 skb_gro_pull(skb, sizeof(*iph)); 1376 skb_set_transport_header(skb, skb_gro_offset(skb)); 1377 1378 pp = ops->callbacks.gro_receive(head, skb); 1379 1380 out_unlock: 1381 rcu_read_unlock(); 1382 1383 out: 1384 NAPI_GRO_CB(skb)->flush |= flush; 1385 1386 return pp; 1387 } 1388 1389 int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 1390 { 1391 if (sk->sk_family == AF_INET) 1392 return ip_recv_error(sk, msg, len, addr_len); 1393 #if IS_ENABLED(CONFIG_IPV6) 1394 if (sk->sk_family == AF_INET6) 1395 return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len); 1396 #endif 1397 return -EINVAL; 1398 } 1399 1400 static int inet_gro_complete(struct sk_buff *skb, int nhoff) 1401 { 1402 __be16 newlen = htons(skb->len - nhoff); 1403 struct iphdr *iph = (struct iphdr *)(skb->data + nhoff); 1404 const struct net_offload *ops; 1405 int proto = iph->protocol; 1406 int err = -ENOSYS; 1407 1408 if (skb->encapsulation) 1409 skb_set_inner_network_header(skb, nhoff); 1410 1411 csum_replace2(&iph->check, iph->tot_len, newlen); 1412 iph->tot_len = newlen; 1413 1414 rcu_read_lock(); 1415 ops = rcu_dereference(inet_offloads[proto]); 1416 if (WARN_ON(!ops || !ops->callbacks.gro_complete)) 1417 goto out_unlock; 1418 1419 /* Only need to add sizeof(*iph) to get to the next hdr below 1420 * because any hdr with option will have been flushed in 1421 * inet_gro_receive(). 1422 */ 1423 err = ops->callbacks.gro_complete(skb, nhoff + sizeof(*iph)); 1424 1425 out_unlock: 1426 rcu_read_unlock(); 1427 1428 return err; 1429 } 1430 1431 int inet_ctl_sock_create(struct sock **sk, unsigned short family, 1432 unsigned short type, unsigned char protocol, 1433 struct net *net) 1434 { 1435 struct socket *sock; 1436 int rc = sock_create_kern(net, family, type, protocol, &sock); 1437 1438 if (rc == 0) { 1439 *sk = sock->sk; 1440 (*sk)->sk_allocation = GFP_ATOMIC; 1441 /* 1442 * Unhash it so that IP input processing does not even see it, 1443 * we do not wish this socket to see incoming packets. 1444 */ 1445 (*sk)->sk_prot->unhash(*sk); 1446 } 1447 return rc; 1448 } 1449 EXPORT_SYMBOL_GPL(inet_ctl_sock_create); 1450 1451 unsigned long snmp_fold_field(void __percpu *mib, int offt) 1452 { 1453 unsigned long res = 0; 1454 int i; 1455 1456 for_each_possible_cpu(i) 1457 res += *(((unsigned long *) per_cpu_ptr(mib, i)) + offt); 1458 return res; 1459 } 1460 EXPORT_SYMBOL_GPL(snmp_fold_field); 1461 1462 #if BITS_PER_LONG==32 1463 1464 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset) 1465 { 1466 u64 res = 0; 1467 int cpu; 1468 1469 for_each_possible_cpu(cpu) { 1470 void *bhptr; 1471 struct u64_stats_sync *syncp; 1472 u64 v; 1473 unsigned int start; 1474 1475 bhptr = per_cpu_ptr(mib, cpu); 1476 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset); 1477 do { 1478 start = u64_stats_fetch_begin_irq(syncp); 1479 v = *(((u64 *) bhptr) + offt); 1480 } while (u64_stats_fetch_retry_irq(syncp, start)); 1481 1482 res += v; 1483 } 1484 return res; 1485 } 1486 EXPORT_SYMBOL_GPL(snmp_fold_field64); 1487 #endif 1488 1489 #ifdef CONFIG_IP_MULTICAST 1490 static const struct net_protocol igmp_protocol = { 1491 .handler = igmp_rcv, 1492 .netns_ok = 1, 1493 }; 1494 #endif 1495 1496 static const struct net_protocol tcp_protocol = { 1497 .early_demux = tcp_v4_early_demux, 1498 .handler = tcp_v4_rcv, 1499 .err_handler = tcp_v4_err, 1500 .no_policy = 1, 1501 .netns_ok = 1, 1502 .icmp_strict_tag_validation = 1, 1503 }; 1504 1505 static const struct net_protocol udp_protocol = { 1506 .early_demux = udp_v4_early_demux, 1507 .handler = udp_rcv, 1508 .err_handler = udp_err, 1509 .no_policy = 1, 1510 .netns_ok = 1, 1511 }; 1512 1513 static const struct net_protocol icmp_protocol = { 1514 .handler = icmp_rcv, 1515 .err_handler = icmp_err, 1516 .no_policy = 1, 1517 .netns_ok = 1, 1518 }; 1519 1520 static __net_init int ipv4_mib_init_net(struct net *net) 1521 { 1522 int i; 1523 1524 net->mib.tcp_statistics = alloc_percpu(struct tcp_mib); 1525 if (!net->mib.tcp_statistics) 1526 goto err_tcp_mib; 1527 net->mib.ip_statistics = alloc_percpu(struct ipstats_mib); 1528 if (!net->mib.ip_statistics) 1529 goto err_ip_mib; 1530 1531 for_each_possible_cpu(i) { 1532 struct ipstats_mib *af_inet_stats; 1533 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i); 1534 u64_stats_init(&af_inet_stats->syncp); 1535 } 1536 1537 net->mib.net_statistics = alloc_percpu(struct linux_mib); 1538 if (!net->mib.net_statistics) 1539 goto err_net_mib; 1540 net->mib.udp_statistics = alloc_percpu(struct udp_mib); 1541 if (!net->mib.udp_statistics) 1542 goto err_udp_mib; 1543 net->mib.udplite_statistics = alloc_percpu(struct udp_mib); 1544 if (!net->mib.udplite_statistics) 1545 goto err_udplite_mib; 1546 net->mib.icmp_statistics = alloc_percpu(struct icmp_mib); 1547 if (!net->mib.icmp_statistics) 1548 goto err_icmp_mib; 1549 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib), 1550 GFP_KERNEL); 1551 if (!net->mib.icmpmsg_statistics) 1552 goto err_icmpmsg_mib; 1553 1554 tcp_mib_init(net); 1555 return 0; 1556 1557 err_icmpmsg_mib: 1558 free_percpu(net->mib.icmp_statistics); 1559 err_icmp_mib: 1560 free_percpu(net->mib.udplite_statistics); 1561 err_udplite_mib: 1562 free_percpu(net->mib.udp_statistics); 1563 err_udp_mib: 1564 free_percpu(net->mib.net_statistics); 1565 err_net_mib: 1566 free_percpu(net->mib.ip_statistics); 1567 err_ip_mib: 1568 free_percpu(net->mib.tcp_statistics); 1569 err_tcp_mib: 1570 return -ENOMEM; 1571 } 1572 1573 static __net_exit void ipv4_mib_exit_net(struct net *net) 1574 { 1575 kfree(net->mib.icmpmsg_statistics); 1576 free_percpu(net->mib.icmp_statistics); 1577 free_percpu(net->mib.udplite_statistics); 1578 free_percpu(net->mib.udp_statistics); 1579 free_percpu(net->mib.net_statistics); 1580 free_percpu(net->mib.ip_statistics); 1581 free_percpu(net->mib.tcp_statistics); 1582 } 1583 1584 static __net_initdata struct pernet_operations ipv4_mib_ops = { 1585 .init = ipv4_mib_init_net, 1586 .exit = ipv4_mib_exit_net, 1587 }; 1588 1589 static int __init init_ipv4_mibs(void) 1590 { 1591 return register_pernet_subsys(&ipv4_mib_ops); 1592 } 1593 1594 static __net_init int inet_init_net(struct net *net) 1595 { 1596 /* 1597 * Set defaults for local port range 1598 */ 1599 seqlock_init(&net->ipv4.ip_local_ports.lock); 1600 net->ipv4.ip_local_ports.range[0] = 32768; 1601 net->ipv4.ip_local_ports.range[1] = 60999; 1602 1603 seqlock_init(&net->ipv4.ping_group_range.lock); 1604 /* 1605 * Sane defaults - nobody may create ping sockets. 1606 * Boot scripts should set this to distro-specific group. 1607 */ 1608 net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1); 1609 net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0); 1610 return 0; 1611 } 1612 1613 static __net_exit void inet_exit_net(struct net *net) 1614 { 1615 } 1616 1617 static __net_initdata struct pernet_operations af_inet_ops = { 1618 .init = inet_init_net, 1619 .exit = inet_exit_net, 1620 }; 1621 1622 static int __init init_inet_pernet_ops(void) 1623 { 1624 return register_pernet_subsys(&af_inet_ops); 1625 } 1626 1627 static int ipv4_proc_init(void); 1628 1629 /* 1630 * IP protocol layer initialiser 1631 */ 1632 1633 static struct packet_offload ip_packet_offload __read_mostly = { 1634 .type = cpu_to_be16(ETH_P_IP), 1635 .callbacks = { 1636 .gso_segment = inet_gso_segment, 1637 .gro_receive = inet_gro_receive, 1638 .gro_complete = inet_gro_complete, 1639 }, 1640 }; 1641 1642 static const struct net_offload ipip_offload = { 1643 .callbacks = { 1644 .gso_segment = inet_gso_segment, 1645 .gro_receive = inet_gro_receive, 1646 .gro_complete = inet_gro_complete, 1647 }, 1648 }; 1649 1650 static int __init ipv4_offload_init(void) 1651 { 1652 /* 1653 * Add offloads 1654 */ 1655 if (udpv4_offload_init() < 0) 1656 pr_crit("%s: Cannot add UDP protocol offload\n", __func__); 1657 if (tcpv4_offload_init() < 0) 1658 pr_crit("%s: Cannot add TCP protocol offload\n", __func__); 1659 1660 dev_add_offload(&ip_packet_offload); 1661 inet_add_offload(&ipip_offload, IPPROTO_IPIP); 1662 return 0; 1663 } 1664 1665 fs_initcall(ipv4_offload_init); 1666 1667 static struct packet_type ip_packet_type __read_mostly = { 1668 .type = cpu_to_be16(ETH_P_IP), 1669 .func = ip_rcv, 1670 }; 1671 1672 static int __init inet_init(void) 1673 { 1674 struct inet_protosw *q; 1675 struct list_head *r; 1676 int rc = -EINVAL; 1677 1678 sock_skb_cb_check_size(sizeof(struct inet_skb_parm)); 1679 1680 rc = proto_register(&tcp_prot, 1); 1681 if (rc) 1682 goto out; 1683 1684 rc = proto_register(&udp_prot, 1); 1685 if (rc) 1686 goto out_unregister_tcp_proto; 1687 1688 rc = proto_register(&raw_prot, 1); 1689 if (rc) 1690 goto out_unregister_udp_proto; 1691 1692 rc = proto_register(&ping_prot, 1); 1693 if (rc) 1694 goto out_unregister_raw_proto; 1695 1696 /* 1697 * Tell SOCKET that we are alive... 1698 */ 1699 1700 (void)sock_register(&inet_family_ops); 1701 1702 #ifdef CONFIG_SYSCTL 1703 ip_static_sysctl_init(); 1704 #endif 1705 1706 /* 1707 * Add all the base protocols. 1708 */ 1709 1710 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 1711 pr_crit("%s: Cannot add ICMP protocol\n", __func__); 1712 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) 1713 pr_crit("%s: Cannot add UDP protocol\n", __func__); 1714 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) 1715 pr_crit("%s: Cannot add TCP protocol\n", __func__); 1716 #ifdef CONFIG_IP_MULTICAST 1717 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 1718 pr_crit("%s: Cannot add IGMP protocol\n", __func__); 1719 #endif 1720 1721 /* Register the socket-side information for inet_create. */ 1722 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 1723 INIT_LIST_HEAD(r); 1724 1725 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 1726 inet_register_protosw(q); 1727 1728 /* 1729 * Set the ARP module up 1730 */ 1731 1732 arp_init(); 1733 1734 /* 1735 * Set the IP module up 1736 */ 1737 1738 ip_init(); 1739 1740 tcp_v4_init(); 1741 1742 /* Setup TCP slab cache for open requests. */ 1743 tcp_init(); 1744 1745 /* Setup UDP memory threshold */ 1746 udp_init(); 1747 1748 /* Add UDP-Lite (RFC 3828) */ 1749 udplite4_register(); 1750 1751 ping_init(); 1752 1753 /* 1754 * Set the ICMP layer up 1755 */ 1756 1757 if (icmp_init() < 0) 1758 panic("Failed to create the ICMP control socket.\n"); 1759 1760 /* 1761 * Initialise the multicast router 1762 */ 1763 #if defined(CONFIG_IP_MROUTE) 1764 if (ip_mr_init()) 1765 pr_crit("%s: Cannot init ipv4 mroute\n", __func__); 1766 #endif 1767 1768 if (init_inet_pernet_ops()) 1769 pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__); 1770 /* 1771 * Initialise per-cpu ipv4 mibs 1772 */ 1773 1774 if (init_ipv4_mibs()) 1775 pr_crit("%s: Cannot init ipv4 mibs\n", __func__); 1776 1777 ipv4_proc_init(); 1778 1779 ipfrag_init(); 1780 1781 dev_add_pack(&ip_packet_type); 1782 1783 rc = 0; 1784 out: 1785 return rc; 1786 out_unregister_raw_proto: 1787 proto_unregister(&raw_prot); 1788 out_unregister_udp_proto: 1789 proto_unregister(&udp_prot); 1790 out_unregister_tcp_proto: 1791 proto_unregister(&tcp_prot); 1792 goto out; 1793 } 1794 1795 fs_initcall(inet_init); 1796 1797 /* ------------------------------------------------------------------------ */ 1798 1799 #ifdef CONFIG_PROC_FS 1800 static int __init ipv4_proc_init(void) 1801 { 1802 int rc = 0; 1803 1804 if (raw_proc_init()) 1805 goto out_raw; 1806 if (tcp4_proc_init()) 1807 goto out_tcp; 1808 if (udp4_proc_init()) 1809 goto out_udp; 1810 if (ping_proc_init()) 1811 goto out_ping; 1812 if (ip_misc_proc_init()) 1813 goto out_misc; 1814 out: 1815 return rc; 1816 out_misc: 1817 ping_proc_exit(); 1818 out_ping: 1819 udp4_proc_exit(); 1820 out_udp: 1821 tcp4_proc_exit(); 1822 out_tcp: 1823 raw_proc_exit(); 1824 out_raw: 1825 rc = -ENOMEM; 1826 goto out; 1827 } 1828 1829 #else /* CONFIG_PROC_FS */ 1830 static int __init ipv4_proc_init(void) 1831 { 1832 return 0; 1833 } 1834 #endif /* CONFIG_PROC_FS */ 1835 1836 MODULE_ALIAS_NETPROTO(PF_INET); 1837 1838