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/ip_tunnels.h> 116 #include <net/xfrm.h> 117 #include <net/net_namespace.h> 118 #include <net/secure_seq.h> 119 #ifdef CONFIG_IP_MROUTE 120 #include <linux/mroute.h> 121 #endif 122 #include <net/l3mdev.h> 123 124 125 /* The inetsw table contains everything that inet_create needs to 126 * build a new socket. 127 */ 128 static struct list_head inetsw[SOCK_MAX]; 129 static DEFINE_SPINLOCK(inetsw_lock); 130 131 /* New destruction routine */ 132 133 void inet_sock_destruct(struct sock *sk) 134 { 135 struct inet_sock *inet = inet_sk(sk); 136 137 __skb_queue_purge(&sk->sk_receive_queue); 138 __skb_queue_purge(&sk->sk_error_queue); 139 140 sk_mem_reclaim(sk); 141 142 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) { 143 pr_err("Attempt to release TCP socket in state %d %p\n", 144 sk->sk_state, sk); 145 return; 146 } 147 if (!sock_flag(sk, SOCK_DEAD)) { 148 pr_err("Attempt to release alive inet socket %p\n", sk); 149 return; 150 } 151 152 WARN_ON(atomic_read(&sk->sk_rmem_alloc)); 153 WARN_ON(atomic_read(&sk->sk_wmem_alloc)); 154 WARN_ON(sk->sk_wmem_queued); 155 WARN_ON(sk->sk_forward_alloc); 156 157 kfree(rcu_dereference_protected(inet->inet_opt, 1)); 158 dst_release(rcu_dereference_check(sk->sk_dst_cache, 1)); 159 dst_release(sk->sk_rx_dst); 160 sk_refcnt_debug_dec(sk); 161 } 162 EXPORT_SYMBOL(inet_sock_destruct); 163 164 /* 165 * The routines beyond this point handle the behaviour of an AF_INET 166 * socket object. Mostly it punts to the subprotocols of IP to do 167 * the work. 168 */ 169 170 /* 171 * Automatically bind an unbound socket. 172 */ 173 174 static int inet_autobind(struct sock *sk) 175 { 176 struct inet_sock *inet; 177 /* We may need to bind the socket. */ 178 lock_sock(sk); 179 inet = inet_sk(sk); 180 if (!inet->inet_num) { 181 if (sk->sk_prot->get_port(sk, 0)) { 182 release_sock(sk); 183 return -EAGAIN; 184 } 185 inet->inet_sport = htons(inet->inet_num); 186 } 187 release_sock(sk); 188 return 0; 189 } 190 191 /* 192 * Move a socket into listening state. 193 */ 194 int inet_listen(struct socket *sock, int backlog) 195 { 196 struct sock *sk = sock->sk; 197 unsigned char old_state; 198 int err; 199 200 lock_sock(sk); 201 202 err = -EINVAL; 203 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM) 204 goto out; 205 206 old_state = sk->sk_state; 207 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN))) 208 goto out; 209 210 /* Really, if the socket is already in listen state 211 * we can only allow the backlog to be adjusted. 212 */ 213 if (old_state != TCP_LISTEN) { 214 /* Check special setups for testing purpose to enable TFO w/o 215 * requiring TCP_FASTOPEN sockopt. 216 * Note that only TCP sockets (SOCK_STREAM) will reach here. 217 * Also fastopenq may already been allocated because this 218 * socket was in TCP_LISTEN state previously but was 219 * shutdown() (rather than close()). 220 */ 221 if ((sysctl_tcp_fastopen & TFO_SERVER_ENABLE) != 0 && 222 !inet_csk(sk)->icsk_accept_queue.fastopenq.max_qlen) { 223 if ((sysctl_tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) != 0) 224 fastopen_queue_tune(sk, backlog); 225 else if ((sysctl_tcp_fastopen & 226 TFO_SERVER_WO_SOCKOPT2) != 0) 227 fastopen_queue_tune(sk, 228 ((uint)sysctl_tcp_fastopen) >> 16); 229 230 tcp_fastopen_init_key_once(true); 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 if (protocol < 0 || protocol >= IPPROTO_MAX) 261 return -EINVAL; 262 263 sock->state = SS_UNCONNECTED; 264 265 /* Look for the requested type/protocol pair. */ 266 lookup_protocol: 267 err = -ESOCKTNOSUPPORT; 268 rcu_read_lock(); 269 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) { 270 271 err = 0; 272 /* Check the non-wild match. */ 273 if (protocol == answer->protocol) { 274 if (protocol != IPPROTO_IP) 275 break; 276 } else { 277 /* Check for the two wild cases. */ 278 if (IPPROTO_IP == protocol) { 279 protocol = answer->protocol; 280 break; 281 } 282 if (IPPROTO_IP == answer->protocol) 283 break; 284 } 285 err = -EPROTONOSUPPORT; 286 } 287 288 if (unlikely(err)) { 289 if (try_loading_module < 2) { 290 rcu_read_unlock(); 291 /* 292 * Be more specific, e.g. net-pf-2-proto-132-type-1 293 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) 294 */ 295 if (++try_loading_module == 1) 296 request_module("net-pf-%d-proto-%d-type-%d", 297 PF_INET, protocol, sock->type); 298 /* 299 * Fall back to generic, e.g. net-pf-2-proto-132 300 * (net-pf-PF_INET-proto-IPPROTO_SCTP) 301 */ 302 else 303 request_module("net-pf-%d-proto-%d", 304 PF_INET, protocol); 305 goto lookup_protocol; 306 } else 307 goto out_rcu_unlock; 308 } 309 310 err = -EPERM; 311 if (sock->type == SOCK_RAW && !kern && 312 !ns_capable(net->user_ns, CAP_NET_RAW)) 313 goto out_rcu_unlock; 314 315 sock->ops = answer->ops; 316 answer_prot = answer->prot; 317 answer_flags = answer->flags; 318 rcu_read_unlock(); 319 320 WARN_ON(!answer_prot->slab); 321 322 err = -ENOBUFS; 323 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot, kern); 324 if (!sk) 325 goto out; 326 327 err = 0; 328 if (INET_PROTOSW_REUSE & answer_flags) 329 sk->sk_reuse = SK_CAN_REUSE; 330 331 inet = inet_sk(sk); 332 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 333 334 inet->nodefrag = 0; 335 336 if (SOCK_RAW == sock->type) { 337 inet->inet_num = protocol; 338 if (IPPROTO_RAW == protocol) 339 inet->hdrincl = 1; 340 } 341 342 if (net->ipv4.sysctl_ip_no_pmtu_disc) 343 inet->pmtudisc = IP_PMTUDISC_DONT; 344 else 345 inet->pmtudisc = IP_PMTUDISC_WANT; 346 347 inet->inet_id = 0; 348 349 sock_init_data(sock, sk); 350 351 sk->sk_destruct = inet_sock_destruct; 352 sk->sk_protocol = protocol; 353 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 354 355 inet->uc_ttl = -1; 356 inet->mc_loop = 1; 357 inet->mc_ttl = 1; 358 inet->mc_all = 1; 359 inet->mc_index = 0; 360 inet->mc_list = NULL; 361 inet->rcv_tos = 0; 362 363 sk_refcnt_debug_inc(sk); 364 365 if (inet->inet_num) { 366 /* It assumes that any protocol which allows 367 * the user to assign a number at socket 368 * creation time automatically 369 * shares. 370 */ 371 inet->inet_sport = htons(inet->inet_num); 372 /* Add to protocol hash chains. */ 373 sk->sk_prot->hash(sk); 374 } 375 376 if (sk->sk_prot->init) { 377 err = sk->sk_prot->init(sk); 378 if (err) 379 sk_common_release(sk); 380 } 381 out: 382 return err; 383 out_rcu_unlock: 384 rcu_read_unlock(); 385 goto out; 386 } 387 388 389 /* 390 * The peer socket should always be NULL (or else). When we call this 391 * function we are destroying the object and from then on nobody 392 * should refer to it. 393 */ 394 int inet_release(struct socket *sock) 395 { 396 struct sock *sk = sock->sk; 397 398 if (sk) { 399 long timeout; 400 401 /* Applications forget to leave groups before exiting */ 402 ip_mc_drop_socket(sk); 403 404 /* If linger is set, we don't return until the close 405 * is complete. Otherwise we return immediately. The 406 * actually closing is done the same either way. 407 * 408 * If the close is due to the process exiting, we never 409 * linger.. 410 */ 411 timeout = 0; 412 if (sock_flag(sk, SOCK_LINGER) && 413 !(current->flags & PF_EXITING)) 414 timeout = sk->sk_lingertime; 415 sock->sk = NULL; 416 sk->sk_prot->close(sk, timeout); 417 } 418 return 0; 419 } 420 EXPORT_SYMBOL(inet_release); 421 422 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 423 { 424 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 425 struct sock *sk = sock->sk; 426 struct inet_sock *inet = inet_sk(sk); 427 struct net *net = sock_net(sk); 428 unsigned short snum; 429 int chk_addr_ret; 430 u32 tb_id = RT_TABLE_LOCAL; 431 int err; 432 433 /* If the socket has its own bind function then use it. (RAW) */ 434 if (sk->sk_prot->bind) { 435 err = sk->sk_prot->bind(sk, uaddr, addr_len); 436 goto out; 437 } 438 err = -EINVAL; 439 if (addr_len < sizeof(struct sockaddr_in)) 440 goto out; 441 442 if (addr->sin_family != AF_INET) { 443 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET) 444 * only if s_addr is INADDR_ANY. 445 */ 446 err = -EAFNOSUPPORT; 447 if (addr->sin_family != AF_UNSPEC || 448 addr->sin_addr.s_addr != htonl(INADDR_ANY)) 449 goto out; 450 } 451 452 tb_id = l3mdev_fib_table_by_index(net, sk->sk_bound_dev_if) ? : tb_id; 453 chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id); 454 455 /* Not specified by any standard per-se, however it breaks too 456 * many applications when removed. It is unfortunate since 457 * allowing applications to make a non-local bind solves 458 * several problems with systems using dynamic addressing. 459 * (ie. your servers still start up even if your ISDN link 460 * is temporarily down) 461 */ 462 err = -EADDRNOTAVAIL; 463 if (!net->ipv4.sysctl_ip_nonlocal_bind && 464 !(inet->freebind || inet->transparent) && 465 addr->sin_addr.s_addr != htonl(INADDR_ANY) && 466 chk_addr_ret != RTN_LOCAL && 467 chk_addr_ret != RTN_MULTICAST && 468 chk_addr_ret != RTN_BROADCAST) 469 goto out; 470 471 snum = ntohs(addr->sin_port); 472 err = -EACCES; 473 if (snum && snum < PROT_SOCK && 474 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 475 goto out; 476 477 /* We keep a pair of addresses. rcv_saddr is the one 478 * used by hash lookups, and saddr is used for transmit. 479 * 480 * In the BSD API these are the same except where it 481 * would be illegal to use them (multicast/broadcast) in 482 * which case the sending device address is used. 483 */ 484 lock_sock(sk); 485 486 /* Check these errors (active socket, double bind). */ 487 err = -EINVAL; 488 if (sk->sk_state != TCP_CLOSE || inet->inet_num) 489 goto out_release_sock; 490 491 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 492 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 493 inet->inet_saddr = 0; /* Use device */ 494 495 /* Make sure we are allowed to bind here. */ 496 if ((snum || !inet->bind_address_no_port) && 497 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 socket *sock, struct msghdr *msg, size_t size) 726 { 727 struct sock *sk = sock->sk; 728 729 sock_rps_record_flow(sk); 730 731 /* We may need to bind the socket. */ 732 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 733 inet_autobind(sk)) 734 return -EAGAIN; 735 736 return sk->sk_prot->sendmsg(sk, msg, size); 737 } 738 EXPORT_SYMBOL(inet_sendmsg); 739 740 ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, 741 size_t size, int flags) 742 { 743 struct sock *sk = sock->sk; 744 745 sock_rps_record_flow(sk); 746 747 /* We may need to bind the socket. */ 748 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 749 inet_autobind(sk)) 750 return -EAGAIN; 751 752 if (sk->sk_prot->sendpage) 753 return sk->sk_prot->sendpage(sk, page, offset, size, flags); 754 return sock_no_sendpage(sock, page, offset, size, flags); 755 } 756 EXPORT_SYMBOL(inet_sendpage); 757 758 int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 759 int flags) 760 { 761 struct sock *sk = sock->sk; 762 int addr_len = 0; 763 int err; 764 765 sock_rps_record_flow(sk); 766 767 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT, 768 flags & ~MSG_DONTWAIT, &addr_len); 769 if (err >= 0) 770 msg->msg_namelen = addr_len; 771 return err; 772 } 773 EXPORT_SYMBOL(inet_recvmsg); 774 775 int inet_shutdown(struct socket *sock, int how) 776 { 777 struct sock *sk = sock->sk; 778 int err = 0; 779 780 /* This should really check to make sure 781 * the socket is a TCP socket. (WHY AC...) 782 */ 783 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and 784 1->2 bit 2 snds. 785 2->3 */ 786 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ 787 return -EINVAL; 788 789 lock_sock(sk); 790 if (sock->state == SS_CONNECTING) { 791 if ((1 << sk->sk_state) & 792 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) 793 sock->state = SS_DISCONNECTING; 794 else 795 sock->state = SS_CONNECTED; 796 } 797 798 switch (sk->sk_state) { 799 case TCP_CLOSE: 800 err = -ENOTCONN; 801 /* Hack to wake up other listeners, who can poll for 802 POLLHUP, even on eg. unconnected UDP sockets -- RR */ 803 default: 804 sk->sk_shutdown |= how; 805 if (sk->sk_prot->shutdown) 806 sk->sk_prot->shutdown(sk, how); 807 break; 808 809 /* Remaining two branches are temporary solution for missing 810 * close() in multithreaded environment. It is _not_ a good idea, 811 * but we have no choice until close() is repaired at VFS level. 812 */ 813 case TCP_LISTEN: 814 if (!(how & RCV_SHUTDOWN)) 815 break; 816 /* Fall through */ 817 case TCP_SYN_SENT: 818 err = sk->sk_prot->disconnect(sk, O_NONBLOCK); 819 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 820 break; 821 } 822 823 /* Wake up anyone sleeping in poll. */ 824 sk->sk_state_change(sk); 825 release_sock(sk); 826 return err; 827 } 828 EXPORT_SYMBOL(inet_shutdown); 829 830 /* 831 * ioctl() calls you can issue on an INET socket. Most of these are 832 * device configuration and stuff and very rarely used. Some ioctls 833 * pass on to the socket itself. 834 * 835 * NOTE: I like the idea of a module for the config stuff. ie ifconfig 836 * loads the devconfigure module does its configuring and unloads it. 837 * There's a good 20K of config code hanging around the kernel. 838 */ 839 840 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 841 { 842 struct sock *sk = sock->sk; 843 int err = 0; 844 struct net *net = sock_net(sk); 845 846 switch (cmd) { 847 case SIOCGSTAMP: 848 err = sock_get_timestamp(sk, (struct timeval __user *)arg); 849 break; 850 case SIOCGSTAMPNS: 851 err = sock_get_timestampns(sk, (struct timespec __user *)arg); 852 break; 853 case SIOCADDRT: 854 case SIOCDELRT: 855 case SIOCRTMSG: 856 err = ip_rt_ioctl(net, cmd, (void __user *)arg); 857 break; 858 case SIOCDARP: 859 case SIOCGARP: 860 case SIOCSARP: 861 err = arp_ioctl(net, cmd, (void __user *)arg); 862 break; 863 case SIOCGIFADDR: 864 case SIOCSIFADDR: 865 case SIOCGIFBRDADDR: 866 case SIOCSIFBRDADDR: 867 case SIOCGIFNETMASK: 868 case SIOCSIFNETMASK: 869 case SIOCGIFDSTADDR: 870 case SIOCSIFDSTADDR: 871 case SIOCSIFPFLAGS: 872 case SIOCGIFPFLAGS: 873 case SIOCSIFFLAGS: 874 err = devinet_ioctl(net, cmd, (void __user *)arg); 875 break; 876 default: 877 if (sk->sk_prot->ioctl) 878 err = sk->sk_prot->ioctl(sk, cmd, arg); 879 else 880 err = -ENOIOCTLCMD; 881 break; 882 } 883 return err; 884 } 885 EXPORT_SYMBOL(inet_ioctl); 886 887 #ifdef CONFIG_COMPAT 888 static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 889 { 890 struct sock *sk = sock->sk; 891 int err = -ENOIOCTLCMD; 892 893 if (sk->sk_prot->compat_ioctl) 894 err = sk->sk_prot->compat_ioctl(sk, cmd, arg); 895 896 return err; 897 } 898 #endif 899 900 const struct proto_ops inet_stream_ops = { 901 .family = PF_INET, 902 .owner = THIS_MODULE, 903 .release = inet_release, 904 .bind = inet_bind, 905 .connect = inet_stream_connect, 906 .socketpair = sock_no_socketpair, 907 .accept = inet_accept, 908 .getname = inet_getname, 909 .poll = tcp_poll, 910 .ioctl = inet_ioctl, 911 .listen = inet_listen, 912 .shutdown = inet_shutdown, 913 .setsockopt = sock_common_setsockopt, 914 .getsockopt = sock_common_getsockopt, 915 .sendmsg = inet_sendmsg, 916 .recvmsg = inet_recvmsg, 917 .mmap = sock_no_mmap, 918 .sendpage = inet_sendpage, 919 .splice_read = tcp_splice_read, 920 #ifdef CONFIG_COMPAT 921 .compat_setsockopt = compat_sock_common_setsockopt, 922 .compat_getsockopt = compat_sock_common_getsockopt, 923 .compat_ioctl = inet_compat_ioctl, 924 #endif 925 }; 926 EXPORT_SYMBOL(inet_stream_ops); 927 928 const struct proto_ops inet_dgram_ops = { 929 .family = PF_INET, 930 .owner = THIS_MODULE, 931 .release = inet_release, 932 .bind = inet_bind, 933 .connect = inet_dgram_connect, 934 .socketpair = sock_no_socketpair, 935 .accept = sock_no_accept, 936 .getname = inet_getname, 937 .poll = udp_poll, 938 .ioctl = inet_ioctl, 939 .listen = sock_no_listen, 940 .shutdown = inet_shutdown, 941 .setsockopt = sock_common_setsockopt, 942 .getsockopt = sock_common_getsockopt, 943 .sendmsg = inet_sendmsg, 944 .recvmsg = inet_recvmsg, 945 .mmap = sock_no_mmap, 946 .sendpage = inet_sendpage, 947 #ifdef CONFIG_COMPAT 948 .compat_setsockopt = compat_sock_common_setsockopt, 949 .compat_getsockopt = compat_sock_common_getsockopt, 950 .compat_ioctl = inet_compat_ioctl, 951 #endif 952 }; 953 EXPORT_SYMBOL(inet_dgram_ops); 954 955 /* 956 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 957 * udp_poll 958 */ 959 static const struct proto_ops inet_sockraw_ops = { 960 .family = PF_INET, 961 .owner = THIS_MODULE, 962 .release = inet_release, 963 .bind = inet_bind, 964 .connect = inet_dgram_connect, 965 .socketpair = sock_no_socketpair, 966 .accept = sock_no_accept, 967 .getname = inet_getname, 968 .poll = datagram_poll, 969 .ioctl = inet_ioctl, 970 .listen = sock_no_listen, 971 .shutdown = inet_shutdown, 972 .setsockopt = sock_common_setsockopt, 973 .getsockopt = sock_common_getsockopt, 974 .sendmsg = inet_sendmsg, 975 .recvmsg = inet_recvmsg, 976 .mmap = sock_no_mmap, 977 .sendpage = inet_sendpage, 978 #ifdef CONFIG_COMPAT 979 .compat_setsockopt = compat_sock_common_setsockopt, 980 .compat_getsockopt = compat_sock_common_getsockopt, 981 .compat_ioctl = inet_compat_ioctl, 982 #endif 983 }; 984 985 static const struct net_proto_family inet_family_ops = { 986 .family = PF_INET, 987 .create = inet_create, 988 .owner = THIS_MODULE, 989 }; 990 991 /* Upon startup we insert all the elements in inetsw_array[] into 992 * the linked list inetsw. 993 */ 994 static struct inet_protosw inetsw_array[] = 995 { 996 { 997 .type = SOCK_STREAM, 998 .protocol = IPPROTO_TCP, 999 .prot = &tcp_prot, 1000 .ops = &inet_stream_ops, 1001 .flags = INET_PROTOSW_PERMANENT | 1002 INET_PROTOSW_ICSK, 1003 }, 1004 1005 { 1006 .type = SOCK_DGRAM, 1007 .protocol = IPPROTO_UDP, 1008 .prot = &udp_prot, 1009 .ops = &inet_dgram_ops, 1010 .flags = INET_PROTOSW_PERMANENT, 1011 }, 1012 1013 { 1014 .type = SOCK_DGRAM, 1015 .protocol = IPPROTO_ICMP, 1016 .prot = &ping_prot, 1017 .ops = &inet_dgram_ops, 1018 .flags = INET_PROTOSW_REUSE, 1019 }, 1020 1021 { 1022 .type = SOCK_RAW, 1023 .protocol = IPPROTO_IP, /* wild card */ 1024 .prot = &raw_prot, 1025 .ops = &inet_sockraw_ops, 1026 .flags = INET_PROTOSW_REUSE, 1027 } 1028 }; 1029 1030 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) 1031 1032 void inet_register_protosw(struct inet_protosw *p) 1033 { 1034 struct list_head *lh; 1035 struct inet_protosw *answer; 1036 int protocol = p->protocol; 1037 struct list_head *last_perm; 1038 1039 spin_lock_bh(&inetsw_lock); 1040 1041 if (p->type >= SOCK_MAX) 1042 goto out_illegal; 1043 1044 /* If we are trying to override a permanent protocol, bail. */ 1045 last_perm = &inetsw[p->type]; 1046 list_for_each(lh, &inetsw[p->type]) { 1047 answer = list_entry(lh, struct inet_protosw, list); 1048 /* Check only the non-wild match. */ 1049 if ((INET_PROTOSW_PERMANENT & answer->flags) == 0) 1050 break; 1051 if (protocol == answer->protocol) 1052 goto out_permanent; 1053 last_perm = lh; 1054 } 1055 1056 /* Add the new entry after the last permanent entry if any, so that 1057 * the new entry does not override a permanent entry when matched with 1058 * a wild-card protocol. But it is allowed to override any existing 1059 * non-permanent entry. This means that when we remove this entry, the 1060 * system automatically returns to the old behavior. 1061 */ 1062 list_add_rcu(&p->list, last_perm); 1063 out: 1064 spin_unlock_bh(&inetsw_lock); 1065 1066 return; 1067 1068 out_permanent: 1069 pr_err("Attempt to override permanent protocol %d\n", protocol); 1070 goto out; 1071 1072 out_illegal: 1073 pr_err("Ignoring attempt to register invalid socket type %d\n", 1074 p->type); 1075 goto out; 1076 } 1077 EXPORT_SYMBOL(inet_register_protosw); 1078 1079 void inet_unregister_protosw(struct inet_protosw *p) 1080 { 1081 if (INET_PROTOSW_PERMANENT & p->flags) { 1082 pr_err("Attempt to unregister permanent protocol %d\n", 1083 p->protocol); 1084 } else { 1085 spin_lock_bh(&inetsw_lock); 1086 list_del_rcu(&p->list); 1087 spin_unlock_bh(&inetsw_lock); 1088 1089 synchronize_net(); 1090 } 1091 } 1092 EXPORT_SYMBOL(inet_unregister_protosw); 1093 1094 /* 1095 * Shall we try to damage output packets if routing dev changes? 1096 */ 1097 1098 int sysctl_ip_dynaddr __read_mostly; 1099 1100 static int inet_sk_reselect_saddr(struct sock *sk) 1101 { 1102 struct inet_sock *inet = inet_sk(sk); 1103 __be32 old_saddr = inet->inet_saddr; 1104 __be32 daddr = inet->inet_daddr; 1105 struct flowi4 *fl4; 1106 struct rtable *rt; 1107 __be32 new_saddr; 1108 struct ip_options_rcu *inet_opt; 1109 1110 inet_opt = rcu_dereference_protected(inet->inet_opt, 1111 sock_owned_by_user(sk)); 1112 if (inet_opt && inet_opt->opt.srr) 1113 daddr = inet_opt->opt.faddr; 1114 1115 /* Query new route. */ 1116 fl4 = &inet->cork.fl.u.ip4; 1117 rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk), 1118 sk->sk_bound_dev_if, sk->sk_protocol, 1119 inet->inet_sport, inet->inet_dport, sk); 1120 if (IS_ERR(rt)) 1121 return PTR_ERR(rt); 1122 1123 sk_setup_caps(sk, &rt->dst); 1124 1125 new_saddr = fl4->saddr; 1126 1127 if (new_saddr == old_saddr) 1128 return 0; 1129 1130 if (sysctl_ip_dynaddr > 1) { 1131 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n", 1132 __func__, &old_saddr, &new_saddr); 1133 } 1134 1135 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr; 1136 1137 /* 1138 * XXX The only one ugly spot where we need to 1139 * XXX really change the sockets identity after 1140 * XXX it has entered the hashes. -DaveM 1141 * 1142 * Besides that, it does not check for connection 1143 * uniqueness. Wait for troubles. 1144 */ 1145 __sk_prot_rehash(sk); 1146 return 0; 1147 } 1148 1149 int inet_sk_rebuild_header(struct sock *sk) 1150 { 1151 struct inet_sock *inet = inet_sk(sk); 1152 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); 1153 __be32 daddr; 1154 struct ip_options_rcu *inet_opt; 1155 struct flowi4 *fl4; 1156 int err; 1157 1158 /* Route is OK, nothing to do. */ 1159 if (rt) 1160 return 0; 1161 1162 /* Reroute. */ 1163 rcu_read_lock(); 1164 inet_opt = rcu_dereference(inet->inet_opt); 1165 daddr = inet->inet_daddr; 1166 if (inet_opt && inet_opt->opt.srr) 1167 daddr = inet_opt->opt.faddr; 1168 rcu_read_unlock(); 1169 fl4 = &inet->cork.fl.u.ip4; 1170 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr, 1171 inet->inet_dport, inet->inet_sport, 1172 sk->sk_protocol, RT_CONN_FLAGS(sk), 1173 sk->sk_bound_dev_if); 1174 if (!IS_ERR(rt)) { 1175 err = 0; 1176 sk_setup_caps(sk, &rt->dst); 1177 } else { 1178 err = PTR_ERR(rt); 1179 1180 /* Routing failed... */ 1181 sk->sk_route_caps = 0; 1182 /* 1183 * Other protocols have to map its equivalent state to TCP_SYN_SENT. 1184 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme 1185 */ 1186 if (!sysctl_ip_dynaddr || 1187 sk->sk_state != TCP_SYN_SENT || 1188 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 1189 (err = inet_sk_reselect_saddr(sk)) != 0) 1190 sk->sk_err_soft = -err; 1191 } 1192 1193 return err; 1194 } 1195 EXPORT_SYMBOL(inet_sk_rebuild_header); 1196 1197 static struct sk_buff *inet_gso_segment(struct sk_buff *skb, 1198 netdev_features_t features) 1199 { 1200 struct sk_buff *segs = ERR_PTR(-EINVAL); 1201 const struct net_offload *ops; 1202 unsigned int offset = 0; 1203 bool udpfrag, encap; 1204 struct iphdr *iph; 1205 int proto; 1206 int nhoff; 1207 int ihl; 1208 int id; 1209 1210 if (unlikely(skb_shinfo(skb)->gso_type & 1211 ~(SKB_GSO_TCPV4 | 1212 SKB_GSO_UDP | 1213 SKB_GSO_DODGY | 1214 SKB_GSO_TCP_ECN | 1215 SKB_GSO_GRE | 1216 SKB_GSO_GRE_CSUM | 1217 SKB_GSO_IPIP | 1218 SKB_GSO_SIT | 1219 SKB_GSO_TCPV6 | 1220 SKB_GSO_UDP_TUNNEL | 1221 SKB_GSO_UDP_TUNNEL_CSUM | 1222 SKB_GSO_TUNNEL_REMCSUM | 1223 0))) 1224 goto out; 1225 1226 skb_reset_network_header(skb); 1227 nhoff = skb_network_header(skb) - skb_mac_header(skb); 1228 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1229 goto out; 1230 1231 iph = ip_hdr(skb); 1232 ihl = iph->ihl * 4; 1233 if (ihl < sizeof(*iph)) 1234 goto out; 1235 1236 id = ntohs(iph->id); 1237 proto = iph->protocol; 1238 1239 /* Warning: after this point, iph might be no longer valid */ 1240 if (unlikely(!pskb_may_pull(skb, ihl))) 1241 goto out; 1242 __skb_pull(skb, ihl); 1243 1244 encap = SKB_GSO_CB(skb)->encap_level > 0; 1245 if (encap) 1246 features &= skb->dev->hw_enc_features; 1247 SKB_GSO_CB(skb)->encap_level += ihl; 1248 1249 skb_reset_transport_header(skb); 1250 1251 segs = ERR_PTR(-EPROTONOSUPPORT); 1252 1253 if (skb->encapsulation && 1254 skb_shinfo(skb)->gso_type & (SKB_GSO_SIT|SKB_GSO_IPIP)) 1255 udpfrag = proto == IPPROTO_UDP && encap; 1256 else 1257 udpfrag = proto == IPPROTO_UDP && !skb->encapsulation; 1258 1259 ops = rcu_dereference(inet_offloads[proto]); 1260 if (likely(ops && ops->callbacks.gso_segment)) 1261 segs = ops->callbacks.gso_segment(skb, features); 1262 1263 if (IS_ERR_OR_NULL(segs)) 1264 goto out; 1265 1266 skb = segs; 1267 do { 1268 iph = (struct iphdr *)(skb_mac_header(skb) + nhoff); 1269 if (udpfrag) { 1270 iph->id = htons(id); 1271 iph->frag_off = htons(offset >> 3); 1272 if (skb->next) 1273 iph->frag_off |= htons(IP_MF); 1274 offset += skb->len - nhoff - ihl; 1275 } else { 1276 iph->id = htons(id++); 1277 } 1278 iph->tot_len = htons(skb->len - nhoff); 1279 ip_send_check(iph); 1280 if (encap) 1281 skb_reset_inner_headers(skb); 1282 skb->network_header = (u8 *)iph - skb->head; 1283 } while ((skb = skb->next)); 1284 1285 out: 1286 return segs; 1287 } 1288 1289 static struct sk_buff **inet_gro_receive(struct sk_buff **head, 1290 struct sk_buff *skb) 1291 { 1292 const struct net_offload *ops; 1293 struct sk_buff **pp = NULL; 1294 struct sk_buff *p; 1295 const struct iphdr *iph; 1296 unsigned int hlen; 1297 unsigned int off; 1298 unsigned int id; 1299 int flush = 1; 1300 int proto; 1301 1302 off = skb_gro_offset(skb); 1303 hlen = off + sizeof(*iph); 1304 iph = skb_gro_header_fast(skb, off); 1305 if (skb_gro_header_hard(skb, hlen)) { 1306 iph = skb_gro_header_slow(skb, hlen, off); 1307 if (unlikely(!iph)) 1308 goto out; 1309 } 1310 1311 proto = iph->protocol; 1312 1313 rcu_read_lock(); 1314 ops = rcu_dereference(inet_offloads[proto]); 1315 if (!ops || !ops->callbacks.gro_receive) 1316 goto out_unlock; 1317 1318 if (*(u8 *)iph != 0x45) 1319 goto out_unlock; 1320 1321 if (unlikely(ip_fast_csum((u8 *)iph, 5))) 1322 goto out_unlock; 1323 1324 id = ntohl(*(__be32 *)&iph->id); 1325 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF)); 1326 id >>= 16; 1327 1328 for (p = *head; p; p = p->next) { 1329 struct iphdr *iph2; 1330 1331 if (!NAPI_GRO_CB(p)->same_flow) 1332 continue; 1333 1334 iph2 = (struct iphdr *)(p->data + off); 1335 /* The above works because, with the exception of the top 1336 * (inner most) layer, we only aggregate pkts with the same 1337 * hdr length so all the hdrs we'll need to verify will start 1338 * at the same offset. 1339 */ 1340 if ((iph->protocol ^ iph2->protocol) | 1341 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) | 1342 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) { 1343 NAPI_GRO_CB(p)->same_flow = 0; 1344 continue; 1345 } 1346 1347 /* All fields must match except length and checksum. */ 1348 NAPI_GRO_CB(p)->flush |= 1349 (iph->ttl ^ iph2->ttl) | 1350 (iph->tos ^ iph2->tos) | 1351 ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF)); 1352 1353 /* Save the IP ID check to be included later when we get to 1354 * the transport layer so only the inner most IP ID is checked. 1355 * This is because some GSO/TSO implementations do not 1356 * correctly increment the IP ID for the outer hdrs. 1357 */ 1358 NAPI_GRO_CB(p)->flush_id = 1359 ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id); 1360 NAPI_GRO_CB(p)->flush |= flush; 1361 } 1362 1363 NAPI_GRO_CB(skb)->flush |= flush; 1364 skb_set_network_header(skb, off); 1365 /* The above will be needed by the transport layer if there is one 1366 * immediately following this IP hdr. 1367 */ 1368 1369 /* Note : No need to call skb_gro_postpull_rcsum() here, 1370 * as we already checked checksum over ipv4 header was 0 1371 */ 1372 skb_gro_pull(skb, sizeof(*iph)); 1373 skb_set_transport_header(skb, skb_gro_offset(skb)); 1374 1375 pp = ops->callbacks.gro_receive(head, skb); 1376 1377 out_unlock: 1378 rcu_read_unlock(); 1379 1380 out: 1381 NAPI_GRO_CB(skb)->flush |= flush; 1382 1383 return pp; 1384 } 1385 1386 int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 1387 { 1388 if (sk->sk_family == AF_INET) 1389 return ip_recv_error(sk, msg, len, addr_len); 1390 #if IS_ENABLED(CONFIG_IPV6) 1391 if (sk->sk_family == AF_INET6) 1392 return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len); 1393 #endif 1394 return -EINVAL; 1395 } 1396 1397 static int inet_gro_complete(struct sk_buff *skb, int nhoff) 1398 { 1399 __be16 newlen = htons(skb->len - nhoff); 1400 struct iphdr *iph = (struct iphdr *)(skb->data + nhoff); 1401 const struct net_offload *ops; 1402 int proto = iph->protocol; 1403 int err = -ENOSYS; 1404 1405 if (skb->encapsulation) 1406 skb_set_inner_network_header(skb, nhoff); 1407 1408 csum_replace2(&iph->check, iph->tot_len, newlen); 1409 iph->tot_len = newlen; 1410 1411 rcu_read_lock(); 1412 ops = rcu_dereference(inet_offloads[proto]); 1413 if (WARN_ON(!ops || !ops->callbacks.gro_complete)) 1414 goto out_unlock; 1415 1416 /* Only need to add sizeof(*iph) to get to the next hdr below 1417 * because any hdr with option will have been flushed in 1418 * inet_gro_receive(). 1419 */ 1420 err = ops->callbacks.gro_complete(skb, nhoff + sizeof(*iph)); 1421 1422 out_unlock: 1423 rcu_read_unlock(); 1424 1425 return err; 1426 } 1427 1428 int inet_ctl_sock_create(struct sock **sk, unsigned short family, 1429 unsigned short type, unsigned char protocol, 1430 struct net *net) 1431 { 1432 struct socket *sock; 1433 int rc = sock_create_kern(net, family, type, protocol, &sock); 1434 1435 if (rc == 0) { 1436 *sk = sock->sk; 1437 (*sk)->sk_allocation = GFP_ATOMIC; 1438 /* 1439 * Unhash it so that IP input processing does not even see it, 1440 * we do not wish this socket to see incoming packets. 1441 */ 1442 (*sk)->sk_prot->unhash(*sk); 1443 } 1444 return rc; 1445 } 1446 EXPORT_SYMBOL_GPL(inet_ctl_sock_create); 1447 1448 u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offt) 1449 { 1450 return *(((unsigned long *)per_cpu_ptr(mib, cpu)) + offt); 1451 } 1452 EXPORT_SYMBOL_GPL(snmp_get_cpu_field); 1453 1454 unsigned long snmp_fold_field(void __percpu *mib, int offt) 1455 { 1456 unsigned long res = 0; 1457 int i; 1458 1459 for_each_possible_cpu(i) 1460 res += snmp_get_cpu_field(mib, i, offt); 1461 return res; 1462 } 1463 EXPORT_SYMBOL_GPL(snmp_fold_field); 1464 1465 #if BITS_PER_LONG==32 1466 1467 u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offt, 1468 size_t syncp_offset) 1469 { 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 return v; 1483 } 1484 EXPORT_SYMBOL_GPL(snmp_get_cpu_field64); 1485 1486 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset) 1487 { 1488 u64 res = 0; 1489 int cpu; 1490 1491 for_each_possible_cpu(cpu) { 1492 res += snmp_get_cpu_field64(mib, cpu, offt, syncp_offset); 1493 } 1494 return res; 1495 } 1496 EXPORT_SYMBOL_GPL(snmp_fold_field64); 1497 #endif 1498 1499 #ifdef CONFIG_IP_MULTICAST 1500 static const struct net_protocol igmp_protocol = { 1501 .handler = igmp_rcv, 1502 .netns_ok = 1, 1503 }; 1504 #endif 1505 1506 static const struct net_protocol tcp_protocol = { 1507 .early_demux = tcp_v4_early_demux, 1508 .handler = tcp_v4_rcv, 1509 .err_handler = tcp_v4_err, 1510 .no_policy = 1, 1511 .netns_ok = 1, 1512 .icmp_strict_tag_validation = 1, 1513 }; 1514 1515 static const struct net_protocol udp_protocol = { 1516 .early_demux = udp_v4_early_demux, 1517 .handler = udp_rcv, 1518 .err_handler = udp_err, 1519 .no_policy = 1, 1520 .netns_ok = 1, 1521 }; 1522 1523 static const struct net_protocol icmp_protocol = { 1524 .handler = icmp_rcv, 1525 .err_handler = icmp_err, 1526 .no_policy = 1, 1527 .netns_ok = 1, 1528 }; 1529 1530 static __net_init int ipv4_mib_init_net(struct net *net) 1531 { 1532 int i; 1533 1534 net->mib.tcp_statistics = alloc_percpu(struct tcp_mib); 1535 if (!net->mib.tcp_statistics) 1536 goto err_tcp_mib; 1537 net->mib.ip_statistics = alloc_percpu(struct ipstats_mib); 1538 if (!net->mib.ip_statistics) 1539 goto err_ip_mib; 1540 1541 for_each_possible_cpu(i) { 1542 struct ipstats_mib *af_inet_stats; 1543 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i); 1544 u64_stats_init(&af_inet_stats->syncp); 1545 } 1546 1547 net->mib.net_statistics = alloc_percpu(struct linux_mib); 1548 if (!net->mib.net_statistics) 1549 goto err_net_mib; 1550 net->mib.udp_statistics = alloc_percpu(struct udp_mib); 1551 if (!net->mib.udp_statistics) 1552 goto err_udp_mib; 1553 net->mib.udplite_statistics = alloc_percpu(struct udp_mib); 1554 if (!net->mib.udplite_statistics) 1555 goto err_udplite_mib; 1556 net->mib.icmp_statistics = alloc_percpu(struct icmp_mib); 1557 if (!net->mib.icmp_statistics) 1558 goto err_icmp_mib; 1559 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib), 1560 GFP_KERNEL); 1561 if (!net->mib.icmpmsg_statistics) 1562 goto err_icmpmsg_mib; 1563 1564 tcp_mib_init(net); 1565 return 0; 1566 1567 err_icmpmsg_mib: 1568 free_percpu(net->mib.icmp_statistics); 1569 err_icmp_mib: 1570 free_percpu(net->mib.udplite_statistics); 1571 err_udplite_mib: 1572 free_percpu(net->mib.udp_statistics); 1573 err_udp_mib: 1574 free_percpu(net->mib.net_statistics); 1575 err_net_mib: 1576 free_percpu(net->mib.ip_statistics); 1577 err_ip_mib: 1578 free_percpu(net->mib.tcp_statistics); 1579 err_tcp_mib: 1580 return -ENOMEM; 1581 } 1582 1583 static __net_exit void ipv4_mib_exit_net(struct net *net) 1584 { 1585 kfree(net->mib.icmpmsg_statistics); 1586 free_percpu(net->mib.icmp_statistics); 1587 free_percpu(net->mib.udplite_statistics); 1588 free_percpu(net->mib.udp_statistics); 1589 free_percpu(net->mib.net_statistics); 1590 free_percpu(net->mib.ip_statistics); 1591 free_percpu(net->mib.tcp_statistics); 1592 } 1593 1594 static __net_initdata struct pernet_operations ipv4_mib_ops = { 1595 .init = ipv4_mib_init_net, 1596 .exit = ipv4_mib_exit_net, 1597 }; 1598 1599 static int __init init_ipv4_mibs(void) 1600 { 1601 return register_pernet_subsys(&ipv4_mib_ops); 1602 } 1603 1604 static __net_init int inet_init_net(struct net *net) 1605 { 1606 /* 1607 * Set defaults for local port range 1608 */ 1609 seqlock_init(&net->ipv4.ip_local_ports.lock); 1610 net->ipv4.ip_local_ports.range[0] = 32768; 1611 net->ipv4.ip_local_ports.range[1] = 60999; 1612 1613 seqlock_init(&net->ipv4.ping_group_range.lock); 1614 /* 1615 * Sane defaults - nobody may create ping sockets. 1616 * Boot scripts should set this to distro-specific group. 1617 */ 1618 net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1); 1619 net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0); 1620 return 0; 1621 } 1622 1623 static __net_exit void inet_exit_net(struct net *net) 1624 { 1625 } 1626 1627 static __net_initdata struct pernet_operations af_inet_ops = { 1628 .init = inet_init_net, 1629 .exit = inet_exit_net, 1630 }; 1631 1632 static int __init init_inet_pernet_ops(void) 1633 { 1634 return register_pernet_subsys(&af_inet_ops); 1635 } 1636 1637 static int ipv4_proc_init(void); 1638 1639 /* 1640 * IP protocol layer initialiser 1641 */ 1642 1643 static struct packet_offload ip_packet_offload __read_mostly = { 1644 .type = cpu_to_be16(ETH_P_IP), 1645 .callbacks = { 1646 .gso_segment = inet_gso_segment, 1647 .gro_receive = inet_gro_receive, 1648 .gro_complete = inet_gro_complete, 1649 }, 1650 }; 1651 1652 static const struct net_offload ipip_offload = { 1653 .callbacks = { 1654 .gso_segment = inet_gso_segment, 1655 .gro_receive = inet_gro_receive, 1656 .gro_complete = inet_gro_complete, 1657 }, 1658 }; 1659 1660 static int __init ipv4_offload_init(void) 1661 { 1662 /* 1663 * Add offloads 1664 */ 1665 if (udpv4_offload_init() < 0) 1666 pr_crit("%s: Cannot add UDP protocol offload\n", __func__); 1667 if (tcpv4_offload_init() < 0) 1668 pr_crit("%s: Cannot add TCP protocol offload\n", __func__); 1669 1670 dev_add_offload(&ip_packet_offload); 1671 inet_add_offload(&ipip_offload, IPPROTO_IPIP); 1672 return 0; 1673 } 1674 1675 fs_initcall(ipv4_offload_init); 1676 1677 static struct packet_type ip_packet_type __read_mostly = { 1678 .type = cpu_to_be16(ETH_P_IP), 1679 .func = ip_rcv, 1680 }; 1681 1682 static int __init inet_init(void) 1683 { 1684 struct inet_protosw *q; 1685 struct list_head *r; 1686 int rc = -EINVAL; 1687 1688 sock_skb_cb_check_size(sizeof(struct inet_skb_parm)); 1689 1690 rc = proto_register(&tcp_prot, 1); 1691 if (rc) 1692 goto out; 1693 1694 rc = proto_register(&udp_prot, 1); 1695 if (rc) 1696 goto out_unregister_tcp_proto; 1697 1698 rc = proto_register(&raw_prot, 1); 1699 if (rc) 1700 goto out_unregister_udp_proto; 1701 1702 rc = proto_register(&ping_prot, 1); 1703 if (rc) 1704 goto out_unregister_raw_proto; 1705 1706 /* 1707 * Tell SOCKET that we are alive... 1708 */ 1709 1710 (void)sock_register(&inet_family_ops); 1711 1712 #ifdef CONFIG_SYSCTL 1713 ip_static_sysctl_init(); 1714 #endif 1715 1716 /* 1717 * Add all the base protocols. 1718 */ 1719 1720 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 1721 pr_crit("%s: Cannot add ICMP protocol\n", __func__); 1722 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) 1723 pr_crit("%s: Cannot add UDP protocol\n", __func__); 1724 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) 1725 pr_crit("%s: Cannot add TCP protocol\n", __func__); 1726 #ifdef CONFIG_IP_MULTICAST 1727 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 1728 pr_crit("%s: Cannot add IGMP protocol\n", __func__); 1729 #endif 1730 1731 /* Register the socket-side information for inet_create. */ 1732 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 1733 INIT_LIST_HEAD(r); 1734 1735 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 1736 inet_register_protosw(q); 1737 1738 /* 1739 * Set the ARP module up 1740 */ 1741 1742 arp_init(); 1743 1744 /* 1745 * Set the IP module up 1746 */ 1747 1748 ip_init(); 1749 1750 tcp_v4_init(); 1751 1752 /* Setup TCP slab cache for open requests. */ 1753 tcp_init(); 1754 1755 /* Setup UDP memory threshold */ 1756 udp_init(); 1757 1758 /* Add UDP-Lite (RFC 3828) */ 1759 udplite4_register(); 1760 1761 ping_init(); 1762 1763 /* 1764 * Set the ICMP layer up 1765 */ 1766 1767 if (icmp_init() < 0) 1768 panic("Failed to create the ICMP control socket.\n"); 1769 1770 /* 1771 * Initialise the multicast router 1772 */ 1773 #if defined(CONFIG_IP_MROUTE) 1774 if (ip_mr_init()) 1775 pr_crit("%s: Cannot init ipv4 mroute\n", __func__); 1776 #endif 1777 1778 if (init_inet_pernet_ops()) 1779 pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__); 1780 /* 1781 * Initialise per-cpu ipv4 mibs 1782 */ 1783 1784 if (init_ipv4_mibs()) 1785 pr_crit("%s: Cannot init ipv4 mibs\n", __func__); 1786 1787 ipv4_proc_init(); 1788 1789 ipfrag_init(); 1790 1791 dev_add_pack(&ip_packet_type); 1792 1793 ip_tunnel_core_init(); 1794 1795 rc = 0; 1796 out: 1797 return rc; 1798 out_unregister_raw_proto: 1799 proto_unregister(&raw_prot); 1800 out_unregister_udp_proto: 1801 proto_unregister(&udp_prot); 1802 out_unregister_tcp_proto: 1803 proto_unregister(&tcp_prot); 1804 goto out; 1805 } 1806 1807 fs_initcall(inet_init); 1808 1809 /* ------------------------------------------------------------------------ */ 1810 1811 #ifdef CONFIG_PROC_FS 1812 static int __init ipv4_proc_init(void) 1813 { 1814 int rc = 0; 1815 1816 if (raw_proc_init()) 1817 goto out_raw; 1818 if (tcp4_proc_init()) 1819 goto out_tcp; 1820 if (udp4_proc_init()) 1821 goto out_udp; 1822 if (ping_proc_init()) 1823 goto out_ping; 1824 if (ip_misc_proc_init()) 1825 goto out_misc; 1826 out: 1827 return rc; 1828 out_misc: 1829 ping_proc_exit(); 1830 out_ping: 1831 udp4_proc_exit(); 1832 out_udp: 1833 tcp4_proc_exit(); 1834 out_tcp: 1835 raw_proc_exit(); 1836 out_raw: 1837 rc = -ENOMEM; 1838 goto out; 1839 } 1840 1841 #else /* CONFIG_PROC_FS */ 1842 static int __init ipv4_proc_init(void) 1843 { 1844 return 0; 1845 } 1846 #endif /* CONFIG_PROC_FS */ 1847 1848 MODULE_ALIAS_NETPROTO(PF_INET); 1849 1850