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/kmod.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 <linux/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 /* Enable TFO w/o requiring TCP_FASTOPEN socket option. 215 * Note that only TCP sockets (SOCK_STREAM) will reach here. 216 * Also fastopen backlog may already been set via the option 217 * because the socket was in TCP_LISTEN state previously but 218 * was shutdown() rather than close(). 219 */ 220 if ((sysctl_tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) && 221 (sysctl_tcp_fastopen & TFO_SERVER_ENABLE) && 222 !inet_csk(sk)->icsk_accept_queue.fastopenq.max_qlen) { 223 fastopen_queue_tune(sk, backlog); 224 tcp_fastopen_init_key_once(true); 225 } 226 227 err = inet_csk_listen_start(sk, backlog); 228 if (err) 229 goto out; 230 } 231 sk->sk_max_ack_backlog = backlog; 232 err = 0; 233 234 out: 235 release_sock(sk); 236 return err; 237 } 238 EXPORT_SYMBOL(inet_listen); 239 240 /* 241 * Create an inet socket. 242 */ 243 244 static int inet_create(struct net *net, struct socket *sock, int protocol, 245 int kern) 246 { 247 struct sock *sk; 248 struct inet_protosw *answer; 249 struct inet_sock *inet; 250 struct proto *answer_prot; 251 unsigned char answer_flags; 252 int try_loading_module = 0; 253 int err; 254 255 if (protocol < 0 || protocol >= IPPROTO_MAX) 256 return -EINVAL; 257 258 sock->state = SS_UNCONNECTED; 259 260 /* Look for the requested type/protocol pair. */ 261 lookup_protocol: 262 err = -ESOCKTNOSUPPORT; 263 rcu_read_lock(); 264 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) { 265 266 err = 0; 267 /* Check the non-wild match. */ 268 if (protocol == answer->protocol) { 269 if (protocol != IPPROTO_IP) 270 break; 271 } else { 272 /* Check for the two wild cases. */ 273 if (IPPROTO_IP == protocol) { 274 protocol = answer->protocol; 275 break; 276 } 277 if (IPPROTO_IP == answer->protocol) 278 break; 279 } 280 err = -EPROTONOSUPPORT; 281 } 282 283 if (unlikely(err)) { 284 if (try_loading_module < 2) { 285 rcu_read_unlock(); 286 /* 287 * Be more specific, e.g. net-pf-2-proto-132-type-1 288 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) 289 */ 290 if (++try_loading_module == 1) 291 request_module("net-pf-%d-proto-%d-type-%d", 292 PF_INET, protocol, sock->type); 293 /* 294 * Fall back to generic, e.g. net-pf-2-proto-132 295 * (net-pf-PF_INET-proto-IPPROTO_SCTP) 296 */ 297 else 298 request_module("net-pf-%d-proto-%d", 299 PF_INET, protocol); 300 goto lookup_protocol; 301 } else 302 goto out_rcu_unlock; 303 } 304 305 err = -EPERM; 306 if (sock->type == SOCK_RAW && !kern && 307 !ns_capable(net->user_ns, CAP_NET_RAW)) 308 goto out_rcu_unlock; 309 310 sock->ops = answer->ops; 311 answer_prot = answer->prot; 312 answer_flags = answer->flags; 313 rcu_read_unlock(); 314 315 WARN_ON(!answer_prot->slab); 316 317 err = -ENOBUFS; 318 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot, kern); 319 if (!sk) 320 goto out; 321 322 err = 0; 323 if (INET_PROTOSW_REUSE & answer_flags) 324 sk->sk_reuse = SK_CAN_REUSE; 325 326 inet = inet_sk(sk); 327 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 328 329 inet->nodefrag = 0; 330 331 if (SOCK_RAW == sock->type) { 332 inet->inet_num = protocol; 333 if (IPPROTO_RAW == protocol) 334 inet->hdrincl = 1; 335 } 336 337 if (net->ipv4.sysctl_ip_no_pmtu_disc) 338 inet->pmtudisc = IP_PMTUDISC_DONT; 339 else 340 inet->pmtudisc = IP_PMTUDISC_WANT; 341 342 inet->inet_id = 0; 343 344 sock_init_data(sock, sk); 345 346 sk->sk_destruct = inet_sock_destruct; 347 sk->sk_protocol = protocol; 348 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 349 350 inet->uc_ttl = -1; 351 inet->mc_loop = 1; 352 inet->mc_ttl = 1; 353 inet->mc_all = 1; 354 inet->mc_index = 0; 355 inet->mc_list = NULL; 356 inet->rcv_tos = 0; 357 358 sk_refcnt_debug_inc(sk); 359 360 if (inet->inet_num) { 361 /* It assumes that any protocol which allows 362 * the user to assign a number at socket 363 * creation time automatically 364 * shares. 365 */ 366 inet->inet_sport = htons(inet->inet_num); 367 /* Add to protocol hash chains. */ 368 err = sk->sk_prot->hash(sk); 369 if (err) { 370 sk_common_release(sk); 371 goto out; 372 } 373 } 374 375 if (sk->sk_prot->init) { 376 err = sk->sk_prot->init(sk); 377 if (err) { 378 sk_common_release(sk); 379 goto out; 380 } 381 } 382 383 if (!kern) { 384 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk); 385 if (err) { 386 sk_common_release(sk); 387 goto out; 388 } 389 } 390 out: 391 return err; 392 out_rcu_unlock: 393 rcu_read_unlock(); 394 goto out; 395 } 396 397 398 /* 399 * The peer socket should always be NULL (or else). When we call this 400 * function we are destroying the object and from then on nobody 401 * should refer to it. 402 */ 403 int inet_release(struct socket *sock) 404 { 405 struct sock *sk = sock->sk; 406 407 if (sk) { 408 long timeout; 409 410 /* Applications forget to leave groups before exiting */ 411 ip_mc_drop_socket(sk); 412 413 /* If linger is set, we don't return until the close 414 * is complete. Otherwise we return immediately. The 415 * actually closing is done the same either way. 416 * 417 * If the close is due to the process exiting, we never 418 * linger.. 419 */ 420 timeout = 0; 421 if (sock_flag(sk, SOCK_LINGER) && 422 !(current->flags & PF_EXITING)) 423 timeout = sk->sk_lingertime; 424 sock->sk = NULL; 425 sk->sk_prot->close(sk, timeout); 426 } 427 return 0; 428 } 429 EXPORT_SYMBOL(inet_release); 430 431 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 432 { 433 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 434 struct sock *sk = sock->sk; 435 struct inet_sock *inet = inet_sk(sk); 436 struct net *net = sock_net(sk); 437 unsigned short snum; 438 int chk_addr_ret; 439 u32 tb_id = RT_TABLE_LOCAL; 440 int err; 441 442 /* If the socket has its own bind function then use it. (RAW) */ 443 if (sk->sk_prot->bind) { 444 err = sk->sk_prot->bind(sk, uaddr, addr_len); 445 goto out; 446 } 447 err = -EINVAL; 448 if (addr_len < sizeof(struct sockaddr_in)) 449 goto out; 450 451 if (addr->sin_family != AF_INET) { 452 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET) 453 * only if s_addr is INADDR_ANY. 454 */ 455 err = -EAFNOSUPPORT; 456 if (addr->sin_family != AF_UNSPEC || 457 addr->sin_addr.s_addr != htonl(INADDR_ANY)) 458 goto out; 459 } 460 461 tb_id = l3mdev_fib_table_by_index(net, sk->sk_bound_dev_if) ? : tb_id; 462 chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id); 463 464 /* Not specified by any standard per-se, however it breaks too 465 * many applications when removed. It is unfortunate since 466 * allowing applications to make a non-local bind solves 467 * several problems with systems using dynamic addressing. 468 * (ie. your servers still start up even if your ISDN link 469 * is temporarily down) 470 */ 471 err = -EADDRNOTAVAIL; 472 if (!net->ipv4.sysctl_ip_nonlocal_bind && 473 !(inet->freebind || inet->transparent) && 474 addr->sin_addr.s_addr != htonl(INADDR_ANY) && 475 chk_addr_ret != RTN_LOCAL && 476 chk_addr_ret != RTN_MULTICAST && 477 chk_addr_ret != RTN_BROADCAST) 478 goto out; 479 480 snum = ntohs(addr->sin_port); 481 err = -EACCES; 482 if (snum && snum < PROT_SOCK && 483 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 484 goto out; 485 486 /* We keep a pair of addresses. rcv_saddr is the one 487 * used by hash lookups, and saddr is used for transmit. 488 * 489 * In the BSD API these are the same except where it 490 * would be illegal to use them (multicast/broadcast) in 491 * which case the sending device address is used. 492 */ 493 lock_sock(sk); 494 495 /* Check these errors (active socket, double bind). */ 496 err = -EINVAL; 497 if (sk->sk_state != TCP_CLOSE || inet->inet_num) 498 goto out_release_sock; 499 500 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 501 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 502 inet->inet_saddr = 0; /* Use device */ 503 504 /* Make sure we are allowed to bind here. */ 505 if ((snum || !inet->bind_address_no_port) && 506 sk->sk_prot->get_port(sk, snum)) { 507 inet->inet_saddr = inet->inet_rcv_saddr = 0; 508 err = -EADDRINUSE; 509 goto out_release_sock; 510 } 511 512 if (inet->inet_rcv_saddr) 513 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 514 if (snum) 515 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 516 inet->inet_sport = htons(inet->inet_num); 517 inet->inet_daddr = 0; 518 inet->inet_dport = 0; 519 sk_dst_reset(sk); 520 err = 0; 521 out_release_sock: 522 release_sock(sk); 523 out: 524 return err; 525 } 526 EXPORT_SYMBOL(inet_bind); 527 528 int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr, 529 int addr_len, int flags) 530 { 531 struct sock *sk = sock->sk; 532 533 if (addr_len < sizeof(uaddr->sa_family)) 534 return -EINVAL; 535 if (uaddr->sa_family == AF_UNSPEC) 536 return sk->sk_prot->disconnect(sk, flags); 537 538 if (!inet_sk(sk)->inet_num && inet_autobind(sk)) 539 return -EAGAIN; 540 return sk->sk_prot->connect(sk, uaddr, addr_len); 541 } 542 EXPORT_SYMBOL(inet_dgram_connect); 543 544 static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias) 545 { 546 DEFINE_WAIT_FUNC(wait, woken_wake_function); 547 548 add_wait_queue(sk_sleep(sk), &wait); 549 sk->sk_write_pending += writebias; 550 551 /* Basic assumption: if someone sets sk->sk_err, he _must_ 552 * change state of the socket from TCP_SYN_*. 553 * Connect() does not allow to get error notifications 554 * without closing the socket. 555 */ 556 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 557 release_sock(sk); 558 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo); 559 lock_sock(sk); 560 if (signal_pending(current) || !timeo) 561 break; 562 } 563 remove_wait_queue(sk_sleep(sk), &wait); 564 sk->sk_write_pending -= writebias; 565 return timeo; 566 } 567 568 /* 569 * Connect to a remote host. There is regrettably still a little 570 * TCP 'magic' in here. 571 */ 572 int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 573 int addr_len, int flags) 574 { 575 struct sock *sk = sock->sk; 576 int err; 577 long timeo; 578 579 if (addr_len < sizeof(uaddr->sa_family)) 580 return -EINVAL; 581 582 if (uaddr->sa_family == AF_UNSPEC) { 583 err = sk->sk_prot->disconnect(sk, flags); 584 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 585 goto out; 586 } 587 588 switch (sock->state) { 589 default: 590 err = -EINVAL; 591 goto out; 592 case SS_CONNECTED: 593 err = -EISCONN; 594 goto out; 595 case SS_CONNECTING: 596 err = -EALREADY; 597 /* Fall out of switch with err, set for this state */ 598 break; 599 case SS_UNCONNECTED: 600 err = -EISCONN; 601 if (sk->sk_state != TCP_CLOSE) 602 goto out; 603 604 err = sk->sk_prot->connect(sk, uaddr, addr_len); 605 if (err < 0) 606 goto out; 607 608 sock->state = SS_CONNECTING; 609 610 /* Just entered SS_CONNECTING state; the only 611 * difference is that return value in non-blocking 612 * case is EINPROGRESS, rather than EALREADY. 613 */ 614 err = -EINPROGRESS; 615 break; 616 } 617 618 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 619 620 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 621 int writebias = (sk->sk_protocol == IPPROTO_TCP) && 622 tcp_sk(sk)->fastopen_req && 623 tcp_sk(sk)->fastopen_req->data ? 1 : 0; 624 625 /* Error code is set above */ 626 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias)) 627 goto out; 628 629 err = sock_intr_errno(timeo); 630 if (signal_pending(current)) 631 goto out; 632 } 633 634 /* Connection was closed by RST, timeout, ICMP error 635 * or another process disconnected us. 636 */ 637 if (sk->sk_state == TCP_CLOSE) 638 goto sock_error; 639 640 /* sk->sk_err may be not zero now, if RECVERR was ordered by user 641 * and error was received after socket entered established state. 642 * Hence, it is handled normally after connect() return successfully. 643 */ 644 645 sock->state = SS_CONNECTED; 646 err = 0; 647 out: 648 return err; 649 650 sock_error: 651 err = sock_error(sk) ? : -ECONNABORTED; 652 sock->state = SS_UNCONNECTED; 653 if (sk->sk_prot->disconnect(sk, flags)) 654 sock->state = SS_DISCONNECTING; 655 goto out; 656 } 657 EXPORT_SYMBOL(__inet_stream_connect); 658 659 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 660 int addr_len, int flags) 661 { 662 int err; 663 664 lock_sock(sock->sk); 665 err = __inet_stream_connect(sock, uaddr, addr_len, flags); 666 release_sock(sock->sk); 667 return err; 668 } 669 EXPORT_SYMBOL(inet_stream_connect); 670 671 /* 672 * Accept a pending connection. The TCP layer now gives BSD semantics. 673 */ 674 675 int inet_accept(struct socket *sock, struct socket *newsock, int flags) 676 { 677 struct sock *sk1 = sock->sk; 678 int err = -EINVAL; 679 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err); 680 681 if (!sk2) 682 goto do_err; 683 684 lock_sock(sk2); 685 686 sock_rps_record_flow(sk2); 687 WARN_ON(!((1 << sk2->sk_state) & 688 (TCPF_ESTABLISHED | TCPF_SYN_RECV | 689 TCPF_CLOSE_WAIT | TCPF_CLOSE))); 690 691 sock_graft(sk2, newsock); 692 693 newsock->state = SS_CONNECTED; 694 err = 0; 695 release_sock(sk2); 696 do_err: 697 return err; 698 } 699 EXPORT_SYMBOL(inet_accept); 700 701 702 /* 703 * This does both peername and sockname. 704 */ 705 int inet_getname(struct socket *sock, struct sockaddr *uaddr, 706 int *uaddr_len, int peer) 707 { 708 struct sock *sk = sock->sk; 709 struct inet_sock *inet = inet_sk(sk); 710 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr); 711 712 sin->sin_family = AF_INET; 713 if (peer) { 714 if (!inet->inet_dport || 715 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 716 peer == 1)) 717 return -ENOTCONN; 718 sin->sin_port = inet->inet_dport; 719 sin->sin_addr.s_addr = inet->inet_daddr; 720 } else { 721 __be32 addr = inet->inet_rcv_saddr; 722 if (!addr) 723 addr = inet->inet_saddr; 724 sin->sin_port = inet->inet_sport; 725 sin->sin_addr.s_addr = addr; 726 } 727 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 728 *uaddr_len = sizeof(*sin); 729 return 0; 730 } 731 EXPORT_SYMBOL(inet_getname); 732 733 int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) 734 { 735 struct sock *sk = sock->sk; 736 737 sock_rps_record_flow(sk); 738 739 /* We may need to bind the socket. */ 740 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 741 inet_autobind(sk)) 742 return -EAGAIN; 743 744 return sk->sk_prot->sendmsg(sk, msg, size); 745 } 746 EXPORT_SYMBOL(inet_sendmsg); 747 748 ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, 749 size_t size, int flags) 750 { 751 struct sock *sk = sock->sk; 752 753 sock_rps_record_flow(sk); 754 755 /* We may need to bind the socket. */ 756 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 757 inet_autobind(sk)) 758 return -EAGAIN; 759 760 if (sk->sk_prot->sendpage) 761 return sk->sk_prot->sendpage(sk, page, offset, size, flags); 762 return sock_no_sendpage(sock, page, offset, size, flags); 763 } 764 EXPORT_SYMBOL(inet_sendpage); 765 766 int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 767 int flags) 768 { 769 struct sock *sk = sock->sk; 770 int addr_len = 0; 771 int err; 772 773 sock_rps_record_flow(sk); 774 775 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT, 776 flags & ~MSG_DONTWAIT, &addr_len); 777 if (err >= 0) 778 msg->msg_namelen = addr_len; 779 return err; 780 } 781 EXPORT_SYMBOL(inet_recvmsg); 782 783 int inet_shutdown(struct socket *sock, int how) 784 { 785 struct sock *sk = sock->sk; 786 int err = 0; 787 788 /* This should really check to make sure 789 * the socket is a TCP socket. (WHY AC...) 790 */ 791 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and 792 1->2 bit 2 snds. 793 2->3 */ 794 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ 795 return -EINVAL; 796 797 lock_sock(sk); 798 if (sock->state == SS_CONNECTING) { 799 if ((1 << sk->sk_state) & 800 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) 801 sock->state = SS_DISCONNECTING; 802 else 803 sock->state = SS_CONNECTED; 804 } 805 806 switch (sk->sk_state) { 807 case TCP_CLOSE: 808 err = -ENOTCONN; 809 /* Hack to wake up other listeners, who can poll for 810 POLLHUP, even on eg. unconnected UDP sockets -- RR */ 811 default: 812 sk->sk_shutdown |= how; 813 if (sk->sk_prot->shutdown) 814 sk->sk_prot->shutdown(sk, how); 815 break; 816 817 /* Remaining two branches are temporary solution for missing 818 * close() in multithreaded environment. It is _not_ a good idea, 819 * but we have no choice until close() is repaired at VFS level. 820 */ 821 case TCP_LISTEN: 822 if (!(how & RCV_SHUTDOWN)) 823 break; 824 /* Fall through */ 825 case TCP_SYN_SENT: 826 err = sk->sk_prot->disconnect(sk, O_NONBLOCK); 827 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 828 break; 829 } 830 831 /* Wake up anyone sleeping in poll. */ 832 sk->sk_state_change(sk); 833 release_sock(sk); 834 return err; 835 } 836 EXPORT_SYMBOL(inet_shutdown); 837 838 /* 839 * ioctl() calls you can issue on an INET socket. Most of these are 840 * device configuration and stuff and very rarely used. Some ioctls 841 * pass on to the socket itself. 842 * 843 * NOTE: I like the idea of a module for the config stuff. ie ifconfig 844 * loads the devconfigure module does its configuring and unloads it. 845 * There's a good 20K of config code hanging around the kernel. 846 */ 847 848 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 849 { 850 struct sock *sk = sock->sk; 851 int err = 0; 852 struct net *net = sock_net(sk); 853 854 switch (cmd) { 855 case SIOCGSTAMP: 856 err = sock_get_timestamp(sk, (struct timeval __user *)arg); 857 break; 858 case SIOCGSTAMPNS: 859 err = sock_get_timestampns(sk, (struct timespec __user *)arg); 860 break; 861 case SIOCADDRT: 862 case SIOCDELRT: 863 case SIOCRTMSG: 864 err = ip_rt_ioctl(net, cmd, (void __user *)arg); 865 break; 866 case SIOCDARP: 867 case SIOCGARP: 868 case SIOCSARP: 869 err = arp_ioctl(net, cmd, (void __user *)arg); 870 break; 871 case SIOCGIFADDR: 872 case SIOCSIFADDR: 873 case SIOCGIFBRDADDR: 874 case SIOCSIFBRDADDR: 875 case SIOCGIFNETMASK: 876 case SIOCSIFNETMASK: 877 case SIOCGIFDSTADDR: 878 case SIOCSIFDSTADDR: 879 case SIOCSIFPFLAGS: 880 case SIOCGIFPFLAGS: 881 case SIOCSIFFLAGS: 882 err = devinet_ioctl(net, cmd, (void __user *)arg); 883 break; 884 default: 885 if (sk->sk_prot->ioctl) 886 err = sk->sk_prot->ioctl(sk, cmd, arg); 887 else 888 err = -ENOIOCTLCMD; 889 break; 890 } 891 return err; 892 } 893 EXPORT_SYMBOL(inet_ioctl); 894 895 #ifdef CONFIG_COMPAT 896 static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 897 { 898 struct sock *sk = sock->sk; 899 int err = -ENOIOCTLCMD; 900 901 if (sk->sk_prot->compat_ioctl) 902 err = sk->sk_prot->compat_ioctl(sk, cmd, arg); 903 904 return err; 905 } 906 #endif 907 908 const struct proto_ops inet_stream_ops = { 909 .family = PF_INET, 910 .owner = THIS_MODULE, 911 .release = inet_release, 912 .bind = inet_bind, 913 .connect = inet_stream_connect, 914 .socketpair = sock_no_socketpair, 915 .accept = inet_accept, 916 .getname = inet_getname, 917 .poll = tcp_poll, 918 .ioctl = inet_ioctl, 919 .listen = inet_listen, 920 .shutdown = inet_shutdown, 921 .setsockopt = sock_common_setsockopt, 922 .getsockopt = sock_common_getsockopt, 923 .sendmsg = inet_sendmsg, 924 .recvmsg = inet_recvmsg, 925 .mmap = sock_no_mmap, 926 .sendpage = inet_sendpage, 927 .splice_read = tcp_splice_read, 928 .read_sock = tcp_read_sock, 929 .peek_len = tcp_peek_len, 930 #ifdef CONFIG_COMPAT 931 .compat_setsockopt = compat_sock_common_setsockopt, 932 .compat_getsockopt = compat_sock_common_getsockopt, 933 .compat_ioctl = inet_compat_ioctl, 934 #endif 935 }; 936 EXPORT_SYMBOL(inet_stream_ops); 937 938 const struct proto_ops inet_dgram_ops = { 939 .family = PF_INET, 940 .owner = THIS_MODULE, 941 .release = inet_release, 942 .bind = inet_bind, 943 .connect = inet_dgram_connect, 944 .socketpair = sock_no_socketpair, 945 .accept = sock_no_accept, 946 .getname = inet_getname, 947 .poll = udp_poll, 948 .ioctl = inet_ioctl, 949 .listen = sock_no_listen, 950 .shutdown = inet_shutdown, 951 .setsockopt = sock_common_setsockopt, 952 .getsockopt = sock_common_getsockopt, 953 .sendmsg = inet_sendmsg, 954 .recvmsg = inet_recvmsg, 955 .mmap = sock_no_mmap, 956 .sendpage = inet_sendpage, 957 .set_peek_off = sk_set_peek_off, 958 #ifdef CONFIG_COMPAT 959 .compat_setsockopt = compat_sock_common_setsockopt, 960 .compat_getsockopt = compat_sock_common_getsockopt, 961 .compat_ioctl = inet_compat_ioctl, 962 #endif 963 }; 964 EXPORT_SYMBOL(inet_dgram_ops); 965 966 /* 967 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 968 * udp_poll 969 */ 970 static const struct proto_ops inet_sockraw_ops = { 971 .family = PF_INET, 972 .owner = THIS_MODULE, 973 .release = inet_release, 974 .bind = inet_bind, 975 .connect = inet_dgram_connect, 976 .socketpair = sock_no_socketpair, 977 .accept = sock_no_accept, 978 .getname = inet_getname, 979 .poll = datagram_poll, 980 .ioctl = inet_ioctl, 981 .listen = sock_no_listen, 982 .shutdown = inet_shutdown, 983 .setsockopt = sock_common_setsockopt, 984 .getsockopt = sock_common_getsockopt, 985 .sendmsg = inet_sendmsg, 986 .recvmsg = inet_recvmsg, 987 .mmap = sock_no_mmap, 988 .sendpage = inet_sendpage, 989 #ifdef CONFIG_COMPAT 990 .compat_setsockopt = compat_sock_common_setsockopt, 991 .compat_getsockopt = compat_sock_common_getsockopt, 992 .compat_ioctl = inet_compat_ioctl, 993 #endif 994 }; 995 996 static const struct net_proto_family inet_family_ops = { 997 .family = PF_INET, 998 .create = inet_create, 999 .owner = THIS_MODULE, 1000 }; 1001 1002 /* Upon startup we insert all the elements in inetsw_array[] into 1003 * the linked list inetsw. 1004 */ 1005 static struct inet_protosw inetsw_array[] = 1006 { 1007 { 1008 .type = SOCK_STREAM, 1009 .protocol = IPPROTO_TCP, 1010 .prot = &tcp_prot, 1011 .ops = &inet_stream_ops, 1012 .flags = INET_PROTOSW_PERMANENT | 1013 INET_PROTOSW_ICSK, 1014 }, 1015 1016 { 1017 .type = SOCK_DGRAM, 1018 .protocol = IPPROTO_UDP, 1019 .prot = &udp_prot, 1020 .ops = &inet_dgram_ops, 1021 .flags = INET_PROTOSW_PERMANENT, 1022 }, 1023 1024 { 1025 .type = SOCK_DGRAM, 1026 .protocol = IPPROTO_ICMP, 1027 .prot = &ping_prot, 1028 .ops = &inet_dgram_ops, 1029 .flags = INET_PROTOSW_REUSE, 1030 }, 1031 1032 { 1033 .type = SOCK_RAW, 1034 .protocol = IPPROTO_IP, /* wild card */ 1035 .prot = &raw_prot, 1036 .ops = &inet_sockraw_ops, 1037 .flags = INET_PROTOSW_REUSE, 1038 } 1039 }; 1040 1041 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) 1042 1043 void inet_register_protosw(struct inet_protosw *p) 1044 { 1045 struct list_head *lh; 1046 struct inet_protosw *answer; 1047 int protocol = p->protocol; 1048 struct list_head *last_perm; 1049 1050 spin_lock_bh(&inetsw_lock); 1051 1052 if (p->type >= SOCK_MAX) 1053 goto out_illegal; 1054 1055 /* If we are trying to override a permanent protocol, bail. */ 1056 last_perm = &inetsw[p->type]; 1057 list_for_each(lh, &inetsw[p->type]) { 1058 answer = list_entry(lh, struct inet_protosw, list); 1059 /* Check only the non-wild match. */ 1060 if ((INET_PROTOSW_PERMANENT & answer->flags) == 0) 1061 break; 1062 if (protocol == answer->protocol) 1063 goto out_permanent; 1064 last_perm = lh; 1065 } 1066 1067 /* Add the new entry after the last permanent entry if any, so that 1068 * the new entry does not override a permanent entry when matched with 1069 * a wild-card protocol. But it is allowed to override any existing 1070 * non-permanent entry. This means that when we remove this entry, the 1071 * system automatically returns to the old behavior. 1072 */ 1073 list_add_rcu(&p->list, last_perm); 1074 out: 1075 spin_unlock_bh(&inetsw_lock); 1076 1077 return; 1078 1079 out_permanent: 1080 pr_err("Attempt to override permanent protocol %d\n", protocol); 1081 goto out; 1082 1083 out_illegal: 1084 pr_err("Ignoring attempt to register invalid socket type %d\n", 1085 p->type); 1086 goto out; 1087 } 1088 EXPORT_SYMBOL(inet_register_protosw); 1089 1090 void inet_unregister_protosw(struct inet_protosw *p) 1091 { 1092 if (INET_PROTOSW_PERMANENT & p->flags) { 1093 pr_err("Attempt to unregister permanent protocol %d\n", 1094 p->protocol); 1095 } else { 1096 spin_lock_bh(&inetsw_lock); 1097 list_del_rcu(&p->list); 1098 spin_unlock_bh(&inetsw_lock); 1099 1100 synchronize_net(); 1101 } 1102 } 1103 EXPORT_SYMBOL(inet_unregister_protosw); 1104 1105 static int inet_sk_reselect_saddr(struct sock *sk) 1106 { 1107 struct inet_sock *inet = inet_sk(sk); 1108 __be32 old_saddr = inet->inet_saddr; 1109 __be32 daddr = inet->inet_daddr; 1110 struct flowi4 *fl4; 1111 struct rtable *rt; 1112 __be32 new_saddr; 1113 struct ip_options_rcu *inet_opt; 1114 1115 inet_opt = rcu_dereference_protected(inet->inet_opt, 1116 lockdep_sock_is_held(sk)); 1117 if (inet_opt && inet_opt->opt.srr) 1118 daddr = inet_opt->opt.faddr; 1119 1120 /* Query new route. */ 1121 fl4 = &inet->cork.fl.u.ip4; 1122 rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk), 1123 sk->sk_bound_dev_if, sk->sk_protocol, 1124 inet->inet_sport, inet->inet_dport, sk); 1125 if (IS_ERR(rt)) 1126 return PTR_ERR(rt); 1127 1128 sk_setup_caps(sk, &rt->dst); 1129 1130 new_saddr = fl4->saddr; 1131 1132 if (new_saddr == old_saddr) 1133 return 0; 1134 1135 if (sock_net(sk)->ipv4.sysctl_ip_dynaddr > 1) { 1136 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n", 1137 __func__, &old_saddr, &new_saddr); 1138 } 1139 1140 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr; 1141 1142 /* 1143 * XXX The only one ugly spot where we need to 1144 * XXX really change the sockets identity after 1145 * XXX it has entered the hashes. -DaveM 1146 * 1147 * Besides that, it does not check for connection 1148 * uniqueness. Wait for troubles. 1149 */ 1150 return __sk_prot_rehash(sk); 1151 } 1152 1153 int inet_sk_rebuild_header(struct sock *sk) 1154 { 1155 struct inet_sock *inet = inet_sk(sk); 1156 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); 1157 __be32 daddr; 1158 struct ip_options_rcu *inet_opt; 1159 struct flowi4 *fl4; 1160 int err; 1161 1162 /* Route is OK, nothing to do. */ 1163 if (rt) 1164 return 0; 1165 1166 /* Reroute. */ 1167 rcu_read_lock(); 1168 inet_opt = rcu_dereference(inet->inet_opt); 1169 daddr = inet->inet_daddr; 1170 if (inet_opt && inet_opt->opt.srr) 1171 daddr = inet_opt->opt.faddr; 1172 rcu_read_unlock(); 1173 fl4 = &inet->cork.fl.u.ip4; 1174 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr, 1175 inet->inet_dport, inet->inet_sport, 1176 sk->sk_protocol, RT_CONN_FLAGS(sk), 1177 sk->sk_bound_dev_if); 1178 if (!IS_ERR(rt)) { 1179 err = 0; 1180 sk_setup_caps(sk, &rt->dst); 1181 } else { 1182 err = PTR_ERR(rt); 1183 1184 /* Routing failed... */ 1185 sk->sk_route_caps = 0; 1186 /* 1187 * Other protocols have to map its equivalent state to TCP_SYN_SENT. 1188 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme 1189 */ 1190 if (!sock_net(sk)->ipv4.sysctl_ip_dynaddr || 1191 sk->sk_state != TCP_SYN_SENT || 1192 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 1193 (err = inet_sk_reselect_saddr(sk)) != 0) 1194 sk->sk_err_soft = -err; 1195 } 1196 1197 return err; 1198 } 1199 EXPORT_SYMBOL(inet_sk_rebuild_header); 1200 1201 struct sk_buff *inet_gso_segment(struct sk_buff *skb, 1202 netdev_features_t features) 1203 { 1204 bool udpfrag = false, fixedid = false, gso_partial, encap; 1205 struct sk_buff *segs = ERR_PTR(-EINVAL); 1206 const struct net_offload *ops; 1207 unsigned int offset = 0; 1208 struct iphdr *iph; 1209 int proto, tot_len; 1210 int nhoff; 1211 int ihl; 1212 int id; 1213 1214 skb_reset_network_header(skb); 1215 nhoff = skb_network_header(skb) - skb_mac_header(skb); 1216 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1217 goto out; 1218 1219 iph = ip_hdr(skb); 1220 ihl = iph->ihl * 4; 1221 if (ihl < sizeof(*iph)) 1222 goto out; 1223 1224 id = ntohs(iph->id); 1225 proto = iph->protocol; 1226 1227 /* Warning: after this point, iph might be no longer valid */ 1228 if (unlikely(!pskb_may_pull(skb, ihl))) 1229 goto out; 1230 __skb_pull(skb, ihl); 1231 1232 encap = SKB_GSO_CB(skb)->encap_level > 0; 1233 if (encap) 1234 features &= skb->dev->hw_enc_features; 1235 SKB_GSO_CB(skb)->encap_level += ihl; 1236 1237 skb_reset_transport_header(skb); 1238 1239 segs = ERR_PTR(-EPROTONOSUPPORT); 1240 1241 if (!skb->encapsulation || encap) { 1242 udpfrag = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP); 1243 fixedid = !!(skb_shinfo(skb)->gso_type & SKB_GSO_TCP_FIXEDID); 1244 1245 /* fixed ID is invalid if DF bit is not set */ 1246 if (fixedid && !(ip_hdr(skb)->frag_off & htons(IP_DF))) 1247 goto out; 1248 } 1249 1250 ops = rcu_dereference(inet_offloads[proto]); 1251 if (likely(ops && ops->callbacks.gso_segment)) 1252 segs = ops->callbacks.gso_segment(skb, features); 1253 1254 if (IS_ERR_OR_NULL(segs)) 1255 goto out; 1256 1257 gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL); 1258 1259 skb = segs; 1260 do { 1261 iph = (struct iphdr *)(skb_mac_header(skb) + nhoff); 1262 if (udpfrag) { 1263 iph->frag_off = htons(offset >> 3); 1264 if (skb->next) 1265 iph->frag_off |= htons(IP_MF); 1266 offset += skb->len - nhoff - ihl; 1267 tot_len = skb->len - nhoff; 1268 } else if (skb_is_gso(skb)) { 1269 if (!fixedid) { 1270 iph->id = htons(id); 1271 id += skb_shinfo(skb)->gso_segs; 1272 } 1273 1274 if (gso_partial) 1275 tot_len = skb_shinfo(skb)->gso_size + 1276 SKB_GSO_CB(skb)->data_offset + 1277 skb->head - (unsigned char *)iph; 1278 else 1279 tot_len = skb->len - nhoff; 1280 } else { 1281 if (!fixedid) 1282 iph->id = htons(id++); 1283 tot_len = skb->len - nhoff; 1284 } 1285 iph->tot_len = htons(tot_len); 1286 ip_send_check(iph); 1287 if (encap) 1288 skb_reset_inner_headers(skb); 1289 skb->network_header = (u8 *)iph - skb->head; 1290 } while ((skb = skb->next)); 1291 1292 out: 1293 return segs; 1294 } 1295 EXPORT_SYMBOL(inet_gso_segment); 1296 1297 struct sk_buff **inet_gro_receive(struct sk_buff **head, struct sk_buff *skb) 1298 { 1299 const struct net_offload *ops; 1300 struct sk_buff **pp = NULL; 1301 struct sk_buff *p; 1302 const struct iphdr *iph; 1303 unsigned int hlen; 1304 unsigned int off; 1305 unsigned int id; 1306 int flush = 1; 1307 int proto; 1308 1309 off = skb_gro_offset(skb); 1310 hlen = off + sizeof(*iph); 1311 iph = skb_gro_header_fast(skb, off); 1312 if (skb_gro_header_hard(skb, hlen)) { 1313 iph = skb_gro_header_slow(skb, hlen, off); 1314 if (unlikely(!iph)) 1315 goto out; 1316 } 1317 1318 proto = iph->protocol; 1319 1320 rcu_read_lock(); 1321 ops = rcu_dereference(inet_offloads[proto]); 1322 if (!ops || !ops->callbacks.gro_receive) 1323 goto out_unlock; 1324 1325 if (*(u8 *)iph != 0x45) 1326 goto out_unlock; 1327 1328 if (unlikely(ip_fast_csum((u8 *)iph, 5))) 1329 goto out_unlock; 1330 1331 id = ntohl(*(__be32 *)&iph->id); 1332 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF)); 1333 id >>= 16; 1334 1335 for (p = *head; p; p = p->next) { 1336 struct iphdr *iph2; 1337 u16 flush_id; 1338 1339 if (!NAPI_GRO_CB(p)->same_flow) 1340 continue; 1341 1342 iph2 = (struct iphdr *)(p->data + off); 1343 /* The above works because, with the exception of the top 1344 * (inner most) layer, we only aggregate pkts with the same 1345 * hdr length so all the hdrs we'll need to verify will start 1346 * at the same offset. 1347 */ 1348 if ((iph->protocol ^ iph2->protocol) | 1349 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) | 1350 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) { 1351 NAPI_GRO_CB(p)->same_flow = 0; 1352 continue; 1353 } 1354 1355 /* All fields must match except length and checksum. */ 1356 NAPI_GRO_CB(p)->flush |= 1357 (iph->ttl ^ iph2->ttl) | 1358 (iph->tos ^ iph2->tos) | 1359 ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF)); 1360 1361 NAPI_GRO_CB(p)->flush |= flush; 1362 1363 /* We need to store of the IP ID check to be included later 1364 * when we can verify that this packet does in fact belong 1365 * to a given flow. 1366 */ 1367 flush_id = (u16)(id - ntohs(iph2->id)); 1368 1369 /* This bit of code makes it much easier for us to identify 1370 * the cases where we are doing atomic vs non-atomic IP ID 1371 * checks. Specifically an atomic check can return IP ID 1372 * values 0 - 0xFFFF, while a non-atomic check can only 1373 * return 0 or 0xFFFF. 1374 */ 1375 if (!NAPI_GRO_CB(p)->is_atomic || 1376 !(iph->frag_off & htons(IP_DF))) { 1377 flush_id ^= NAPI_GRO_CB(p)->count; 1378 flush_id = flush_id ? 0xFFFF : 0; 1379 } 1380 1381 /* If the previous IP ID value was based on an atomic 1382 * datagram we can overwrite the value and ignore it. 1383 */ 1384 if (NAPI_GRO_CB(skb)->is_atomic) 1385 NAPI_GRO_CB(p)->flush_id = flush_id; 1386 else 1387 NAPI_GRO_CB(p)->flush_id |= flush_id; 1388 } 1389 1390 NAPI_GRO_CB(skb)->is_atomic = !!(iph->frag_off & htons(IP_DF)); 1391 NAPI_GRO_CB(skb)->flush |= flush; 1392 skb_set_network_header(skb, off); 1393 /* The above will be needed by the transport layer if there is one 1394 * immediately following this IP hdr. 1395 */ 1396 1397 /* Note : No need to call skb_gro_postpull_rcsum() here, 1398 * as we already checked checksum over ipv4 header was 0 1399 */ 1400 skb_gro_pull(skb, sizeof(*iph)); 1401 skb_set_transport_header(skb, skb_gro_offset(skb)); 1402 1403 pp = call_gro_receive(ops->callbacks.gro_receive, head, skb); 1404 1405 out_unlock: 1406 rcu_read_unlock(); 1407 1408 out: 1409 NAPI_GRO_CB(skb)->flush |= flush; 1410 1411 return pp; 1412 } 1413 EXPORT_SYMBOL(inet_gro_receive); 1414 1415 static struct sk_buff **ipip_gro_receive(struct sk_buff **head, 1416 struct sk_buff *skb) 1417 { 1418 if (NAPI_GRO_CB(skb)->encap_mark) { 1419 NAPI_GRO_CB(skb)->flush = 1; 1420 return NULL; 1421 } 1422 1423 NAPI_GRO_CB(skb)->encap_mark = 1; 1424 1425 return inet_gro_receive(head, skb); 1426 } 1427 1428 #define SECONDS_PER_DAY 86400 1429 1430 /* inet_current_timestamp - Return IP network timestamp 1431 * 1432 * Return milliseconds since midnight in network byte order. 1433 */ 1434 __be32 inet_current_timestamp(void) 1435 { 1436 u32 secs; 1437 u32 msecs; 1438 struct timespec64 ts; 1439 1440 ktime_get_real_ts64(&ts); 1441 1442 /* Get secs since midnight. */ 1443 (void)div_u64_rem(ts.tv_sec, SECONDS_PER_DAY, &secs); 1444 /* Convert to msecs. */ 1445 msecs = secs * MSEC_PER_SEC; 1446 /* Convert nsec to msec. */ 1447 msecs += (u32)ts.tv_nsec / NSEC_PER_MSEC; 1448 1449 /* Convert to network byte order. */ 1450 return htonl(msecs); 1451 } 1452 EXPORT_SYMBOL(inet_current_timestamp); 1453 1454 int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 1455 { 1456 if (sk->sk_family == AF_INET) 1457 return ip_recv_error(sk, msg, len, addr_len); 1458 #if IS_ENABLED(CONFIG_IPV6) 1459 if (sk->sk_family == AF_INET6) 1460 return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len); 1461 #endif 1462 return -EINVAL; 1463 } 1464 1465 int inet_gro_complete(struct sk_buff *skb, int nhoff) 1466 { 1467 __be16 newlen = htons(skb->len - nhoff); 1468 struct iphdr *iph = (struct iphdr *)(skb->data + nhoff); 1469 const struct net_offload *ops; 1470 int proto = iph->protocol; 1471 int err = -ENOSYS; 1472 1473 if (skb->encapsulation) 1474 skb_set_inner_network_header(skb, nhoff); 1475 1476 csum_replace2(&iph->check, iph->tot_len, newlen); 1477 iph->tot_len = newlen; 1478 1479 rcu_read_lock(); 1480 ops = rcu_dereference(inet_offloads[proto]); 1481 if (WARN_ON(!ops || !ops->callbacks.gro_complete)) 1482 goto out_unlock; 1483 1484 /* Only need to add sizeof(*iph) to get to the next hdr below 1485 * because any hdr with option will have been flushed in 1486 * inet_gro_receive(). 1487 */ 1488 err = ops->callbacks.gro_complete(skb, nhoff + sizeof(*iph)); 1489 1490 out_unlock: 1491 rcu_read_unlock(); 1492 1493 return err; 1494 } 1495 EXPORT_SYMBOL(inet_gro_complete); 1496 1497 static int ipip_gro_complete(struct sk_buff *skb, int nhoff) 1498 { 1499 skb->encapsulation = 1; 1500 skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4; 1501 return inet_gro_complete(skb, nhoff); 1502 } 1503 1504 int inet_ctl_sock_create(struct sock **sk, unsigned short family, 1505 unsigned short type, unsigned char protocol, 1506 struct net *net) 1507 { 1508 struct socket *sock; 1509 int rc = sock_create_kern(net, family, type, protocol, &sock); 1510 1511 if (rc == 0) { 1512 *sk = sock->sk; 1513 (*sk)->sk_allocation = GFP_ATOMIC; 1514 /* 1515 * Unhash it so that IP input processing does not even see it, 1516 * we do not wish this socket to see incoming packets. 1517 */ 1518 (*sk)->sk_prot->unhash(*sk); 1519 } 1520 return rc; 1521 } 1522 EXPORT_SYMBOL_GPL(inet_ctl_sock_create); 1523 1524 u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offt) 1525 { 1526 return *(((unsigned long *)per_cpu_ptr(mib, cpu)) + offt); 1527 } 1528 EXPORT_SYMBOL_GPL(snmp_get_cpu_field); 1529 1530 unsigned long snmp_fold_field(void __percpu *mib, int offt) 1531 { 1532 unsigned long res = 0; 1533 int i; 1534 1535 for_each_possible_cpu(i) 1536 res += snmp_get_cpu_field(mib, i, offt); 1537 return res; 1538 } 1539 EXPORT_SYMBOL_GPL(snmp_fold_field); 1540 1541 #if BITS_PER_LONG==32 1542 1543 u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offt, 1544 size_t syncp_offset) 1545 { 1546 void *bhptr; 1547 struct u64_stats_sync *syncp; 1548 u64 v; 1549 unsigned int start; 1550 1551 bhptr = per_cpu_ptr(mib, cpu); 1552 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset); 1553 do { 1554 start = u64_stats_fetch_begin_irq(syncp); 1555 v = *(((u64 *)bhptr) + offt); 1556 } while (u64_stats_fetch_retry_irq(syncp, start)); 1557 1558 return v; 1559 } 1560 EXPORT_SYMBOL_GPL(snmp_get_cpu_field64); 1561 1562 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset) 1563 { 1564 u64 res = 0; 1565 int cpu; 1566 1567 for_each_possible_cpu(cpu) { 1568 res += snmp_get_cpu_field64(mib, cpu, offt, syncp_offset); 1569 } 1570 return res; 1571 } 1572 EXPORT_SYMBOL_GPL(snmp_fold_field64); 1573 #endif 1574 1575 #ifdef CONFIG_IP_MULTICAST 1576 static const struct net_protocol igmp_protocol = { 1577 .handler = igmp_rcv, 1578 .netns_ok = 1, 1579 }; 1580 #endif 1581 1582 static const struct net_protocol tcp_protocol = { 1583 .early_demux = tcp_v4_early_demux, 1584 .handler = tcp_v4_rcv, 1585 .err_handler = tcp_v4_err, 1586 .no_policy = 1, 1587 .netns_ok = 1, 1588 .icmp_strict_tag_validation = 1, 1589 }; 1590 1591 static const struct net_protocol udp_protocol = { 1592 .early_demux = udp_v4_early_demux, 1593 .handler = udp_rcv, 1594 .err_handler = udp_err, 1595 .no_policy = 1, 1596 .netns_ok = 1, 1597 }; 1598 1599 static const struct net_protocol icmp_protocol = { 1600 .handler = icmp_rcv, 1601 .err_handler = icmp_err, 1602 .no_policy = 1, 1603 .netns_ok = 1, 1604 }; 1605 1606 static __net_init int ipv4_mib_init_net(struct net *net) 1607 { 1608 int i; 1609 1610 net->mib.tcp_statistics = alloc_percpu(struct tcp_mib); 1611 if (!net->mib.tcp_statistics) 1612 goto err_tcp_mib; 1613 net->mib.ip_statistics = alloc_percpu(struct ipstats_mib); 1614 if (!net->mib.ip_statistics) 1615 goto err_ip_mib; 1616 1617 for_each_possible_cpu(i) { 1618 struct ipstats_mib *af_inet_stats; 1619 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i); 1620 u64_stats_init(&af_inet_stats->syncp); 1621 } 1622 1623 net->mib.net_statistics = alloc_percpu(struct linux_mib); 1624 if (!net->mib.net_statistics) 1625 goto err_net_mib; 1626 net->mib.udp_statistics = alloc_percpu(struct udp_mib); 1627 if (!net->mib.udp_statistics) 1628 goto err_udp_mib; 1629 net->mib.udplite_statistics = alloc_percpu(struct udp_mib); 1630 if (!net->mib.udplite_statistics) 1631 goto err_udplite_mib; 1632 net->mib.icmp_statistics = alloc_percpu(struct icmp_mib); 1633 if (!net->mib.icmp_statistics) 1634 goto err_icmp_mib; 1635 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib), 1636 GFP_KERNEL); 1637 if (!net->mib.icmpmsg_statistics) 1638 goto err_icmpmsg_mib; 1639 1640 tcp_mib_init(net); 1641 return 0; 1642 1643 err_icmpmsg_mib: 1644 free_percpu(net->mib.icmp_statistics); 1645 err_icmp_mib: 1646 free_percpu(net->mib.udplite_statistics); 1647 err_udplite_mib: 1648 free_percpu(net->mib.udp_statistics); 1649 err_udp_mib: 1650 free_percpu(net->mib.net_statistics); 1651 err_net_mib: 1652 free_percpu(net->mib.ip_statistics); 1653 err_ip_mib: 1654 free_percpu(net->mib.tcp_statistics); 1655 err_tcp_mib: 1656 return -ENOMEM; 1657 } 1658 1659 static __net_exit void ipv4_mib_exit_net(struct net *net) 1660 { 1661 kfree(net->mib.icmpmsg_statistics); 1662 free_percpu(net->mib.icmp_statistics); 1663 free_percpu(net->mib.udplite_statistics); 1664 free_percpu(net->mib.udp_statistics); 1665 free_percpu(net->mib.net_statistics); 1666 free_percpu(net->mib.ip_statistics); 1667 free_percpu(net->mib.tcp_statistics); 1668 } 1669 1670 static __net_initdata struct pernet_operations ipv4_mib_ops = { 1671 .init = ipv4_mib_init_net, 1672 .exit = ipv4_mib_exit_net, 1673 }; 1674 1675 static int __init init_ipv4_mibs(void) 1676 { 1677 return register_pernet_subsys(&ipv4_mib_ops); 1678 } 1679 1680 static __net_init int inet_init_net(struct net *net) 1681 { 1682 /* 1683 * Set defaults for local port range 1684 */ 1685 seqlock_init(&net->ipv4.ip_local_ports.lock); 1686 net->ipv4.ip_local_ports.range[0] = 32768; 1687 net->ipv4.ip_local_ports.range[1] = 60999; 1688 1689 seqlock_init(&net->ipv4.ping_group_range.lock); 1690 /* 1691 * Sane defaults - nobody may create ping sockets. 1692 * Boot scripts should set this to distro-specific group. 1693 */ 1694 net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1); 1695 net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0); 1696 1697 /* Default values for sysctl-controlled parameters. 1698 * We set them here, in case sysctl is not compiled. 1699 */ 1700 net->ipv4.sysctl_ip_default_ttl = IPDEFTTL; 1701 net->ipv4.sysctl_ip_dynaddr = 0; 1702 net->ipv4.sysctl_ip_early_demux = 1; 1703 1704 return 0; 1705 } 1706 1707 static __net_exit void inet_exit_net(struct net *net) 1708 { 1709 } 1710 1711 static __net_initdata struct pernet_operations af_inet_ops = { 1712 .init = inet_init_net, 1713 .exit = inet_exit_net, 1714 }; 1715 1716 static int __init init_inet_pernet_ops(void) 1717 { 1718 return register_pernet_subsys(&af_inet_ops); 1719 } 1720 1721 static int ipv4_proc_init(void); 1722 1723 /* 1724 * IP protocol layer initialiser 1725 */ 1726 1727 static struct packet_offload ip_packet_offload __read_mostly = { 1728 .type = cpu_to_be16(ETH_P_IP), 1729 .callbacks = { 1730 .gso_segment = inet_gso_segment, 1731 .gro_receive = inet_gro_receive, 1732 .gro_complete = inet_gro_complete, 1733 }, 1734 }; 1735 1736 static const struct net_offload ipip_offload = { 1737 .callbacks = { 1738 .gso_segment = inet_gso_segment, 1739 .gro_receive = ipip_gro_receive, 1740 .gro_complete = ipip_gro_complete, 1741 }, 1742 }; 1743 1744 static int __init ipv4_offload_init(void) 1745 { 1746 /* 1747 * Add offloads 1748 */ 1749 if (udpv4_offload_init() < 0) 1750 pr_crit("%s: Cannot add UDP protocol offload\n", __func__); 1751 if (tcpv4_offload_init() < 0) 1752 pr_crit("%s: Cannot add TCP protocol offload\n", __func__); 1753 1754 dev_add_offload(&ip_packet_offload); 1755 inet_add_offload(&ipip_offload, IPPROTO_IPIP); 1756 return 0; 1757 } 1758 1759 fs_initcall(ipv4_offload_init); 1760 1761 static struct packet_type ip_packet_type __read_mostly = { 1762 .type = cpu_to_be16(ETH_P_IP), 1763 .func = ip_rcv, 1764 }; 1765 1766 static int __init inet_init(void) 1767 { 1768 struct inet_protosw *q; 1769 struct list_head *r; 1770 int rc = -EINVAL; 1771 1772 sock_skb_cb_check_size(sizeof(struct inet_skb_parm)); 1773 1774 rc = proto_register(&tcp_prot, 1); 1775 if (rc) 1776 goto out; 1777 1778 rc = proto_register(&udp_prot, 1); 1779 if (rc) 1780 goto out_unregister_tcp_proto; 1781 1782 rc = proto_register(&raw_prot, 1); 1783 if (rc) 1784 goto out_unregister_udp_proto; 1785 1786 rc = proto_register(&ping_prot, 1); 1787 if (rc) 1788 goto out_unregister_raw_proto; 1789 1790 /* 1791 * Tell SOCKET that we are alive... 1792 */ 1793 1794 (void)sock_register(&inet_family_ops); 1795 1796 #ifdef CONFIG_SYSCTL 1797 ip_static_sysctl_init(); 1798 #endif 1799 1800 /* 1801 * Add all the base protocols. 1802 */ 1803 1804 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 1805 pr_crit("%s: Cannot add ICMP protocol\n", __func__); 1806 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) 1807 pr_crit("%s: Cannot add UDP protocol\n", __func__); 1808 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) 1809 pr_crit("%s: Cannot add TCP protocol\n", __func__); 1810 #ifdef CONFIG_IP_MULTICAST 1811 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 1812 pr_crit("%s: Cannot add IGMP protocol\n", __func__); 1813 #endif 1814 1815 /* Register the socket-side information for inet_create. */ 1816 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 1817 INIT_LIST_HEAD(r); 1818 1819 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 1820 inet_register_protosw(q); 1821 1822 /* 1823 * Set the ARP module up 1824 */ 1825 1826 arp_init(); 1827 1828 /* 1829 * Set the IP module up 1830 */ 1831 1832 ip_init(); 1833 1834 tcp_v4_init(); 1835 1836 /* Setup TCP slab cache for open requests. */ 1837 tcp_init(); 1838 1839 /* Setup UDP memory threshold */ 1840 udp_init(); 1841 1842 /* Add UDP-Lite (RFC 3828) */ 1843 udplite4_register(); 1844 1845 ping_init(); 1846 1847 /* 1848 * Set the ICMP layer up 1849 */ 1850 1851 if (icmp_init() < 0) 1852 panic("Failed to create the ICMP control socket.\n"); 1853 1854 /* 1855 * Initialise the multicast router 1856 */ 1857 #if defined(CONFIG_IP_MROUTE) 1858 if (ip_mr_init()) 1859 pr_crit("%s: Cannot init ipv4 mroute\n", __func__); 1860 #endif 1861 1862 if (init_inet_pernet_ops()) 1863 pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__); 1864 /* 1865 * Initialise per-cpu ipv4 mibs 1866 */ 1867 1868 if (init_ipv4_mibs()) 1869 pr_crit("%s: Cannot init ipv4 mibs\n", __func__); 1870 1871 ipv4_proc_init(); 1872 1873 ipfrag_init(); 1874 1875 dev_add_pack(&ip_packet_type); 1876 1877 ip_tunnel_core_init(); 1878 1879 rc = 0; 1880 out: 1881 return rc; 1882 out_unregister_raw_proto: 1883 proto_unregister(&raw_prot); 1884 out_unregister_udp_proto: 1885 proto_unregister(&udp_prot); 1886 out_unregister_tcp_proto: 1887 proto_unregister(&tcp_prot); 1888 goto out; 1889 } 1890 1891 fs_initcall(inet_init); 1892 1893 /* ------------------------------------------------------------------------ */ 1894 1895 #ifdef CONFIG_PROC_FS 1896 static int __init ipv4_proc_init(void) 1897 { 1898 int rc = 0; 1899 1900 if (raw_proc_init()) 1901 goto out_raw; 1902 if (tcp4_proc_init()) 1903 goto out_tcp; 1904 if (udp4_proc_init()) 1905 goto out_udp; 1906 if (ping_proc_init()) 1907 goto out_ping; 1908 if (ip_misc_proc_init()) 1909 goto out_misc; 1910 out: 1911 return rc; 1912 out_misc: 1913 ping_proc_exit(); 1914 out_ping: 1915 udp4_proc_exit(); 1916 out_udp: 1917 tcp4_proc_exit(); 1918 out_tcp: 1919 raw_proc_exit(); 1920 out_raw: 1921 rc = -ENOMEM; 1922 goto out; 1923 } 1924 1925 #else /* CONFIG_PROC_FS */ 1926 static int __init ipv4_proc_init(void) 1927 { 1928 return 0; 1929 } 1930 #endif /* CONFIG_PROC_FS */ 1931