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 #include <trace/events/sock.h> 125 126 /* The inetsw table contains everything that inet_create needs to 127 * build a new socket. 128 */ 129 static struct list_head inetsw[SOCK_MAX]; 130 static DEFINE_SPINLOCK(inetsw_lock); 131 132 /* New destruction routine */ 133 134 void inet_sock_destruct(struct sock *sk) 135 { 136 struct inet_sock *inet = inet_sk(sk); 137 138 __skb_queue_purge(&sk->sk_receive_queue); 139 __skb_queue_purge(&sk->sk_error_queue); 140 141 sk_mem_reclaim(sk); 142 143 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) { 144 pr_err("Attempt to release TCP socket in state %d %p\n", 145 sk->sk_state, sk); 146 return; 147 } 148 if (!sock_flag(sk, SOCK_DEAD)) { 149 pr_err("Attempt to release alive inet socket %p\n", sk); 150 return; 151 } 152 153 WARN_ON(atomic_read(&sk->sk_rmem_alloc)); 154 WARN_ON(refcount_read(&sk->sk_wmem_alloc)); 155 WARN_ON(sk->sk_wmem_queued); 156 WARN_ON(sk->sk_forward_alloc); 157 158 kfree(rcu_dereference_protected(inet->inet_opt, 1)); 159 dst_release(rcu_dereference_check(sk->sk_dst_cache, 1)); 160 dst_release(sk->sk_rx_dst); 161 sk_refcnt_debug_dec(sk); 162 } 163 EXPORT_SYMBOL(inet_sock_destruct); 164 165 /* 166 * The routines beyond this point handle the behaviour of an AF_INET 167 * socket object. Mostly it punts to the subprotocols of IP to do 168 * the work. 169 */ 170 171 /* 172 * Automatically bind an unbound socket. 173 */ 174 175 static int inet_autobind(struct sock *sk) 176 { 177 struct inet_sock *inet; 178 /* We may need to bind the socket. */ 179 lock_sock(sk); 180 inet = inet_sk(sk); 181 if (!inet->inet_num) { 182 if (sk->sk_prot->get_port(sk, 0)) { 183 release_sock(sk); 184 return -EAGAIN; 185 } 186 inet->inet_sport = htons(inet->inet_num); 187 } 188 release_sock(sk); 189 return 0; 190 } 191 192 /* 193 * Move a socket into listening state. 194 */ 195 int inet_listen(struct socket *sock, int backlog) 196 { 197 struct sock *sk = sock->sk; 198 unsigned char old_state; 199 int err, tcp_fastopen; 200 201 lock_sock(sk); 202 203 err = -EINVAL; 204 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM) 205 goto out; 206 207 old_state = sk->sk_state; 208 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN))) 209 goto out; 210 211 /* Really, if the socket is already in listen state 212 * we can only allow the backlog to be adjusted. 213 */ 214 if (old_state != TCP_LISTEN) { 215 /* Enable TFO w/o requiring TCP_FASTOPEN socket option. 216 * Note that only TCP sockets (SOCK_STREAM) will reach here. 217 * Also fastopen backlog may already been set via the option 218 * because the socket was in TCP_LISTEN state previously but 219 * was shutdown() rather than close(). 220 */ 221 tcp_fastopen = sock_net(sk)->ipv4.sysctl_tcp_fastopen; 222 if ((tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) && 223 (tcp_fastopen & TFO_SERVER_ENABLE) && 224 !inet_csk(sk)->icsk_accept_queue.fastopenq.max_qlen) { 225 fastopen_queue_tune(sk, backlog); 226 tcp_fastopen_init_key_once(sock_net(sk)); 227 } 228 229 err = inet_csk_listen_start(sk, backlog); 230 if (err) 231 goto out; 232 } 233 sk->sk_max_ack_backlog = backlog; 234 err = 0; 235 236 out: 237 release_sock(sk); 238 return err; 239 } 240 EXPORT_SYMBOL(inet_listen); 241 242 /* 243 * Create an inet socket. 244 */ 245 246 static int inet_create(struct net *net, struct socket *sock, int protocol, 247 int kern) 248 { 249 struct sock *sk; 250 struct inet_protosw *answer; 251 struct inet_sock *inet; 252 struct proto *answer_prot; 253 unsigned char answer_flags; 254 int try_loading_module = 0; 255 int err; 256 257 if (protocol < 0 || protocol >= IPPROTO_MAX) 258 return -EINVAL; 259 260 sock->state = SS_UNCONNECTED; 261 262 /* Look for the requested type/protocol pair. */ 263 lookup_protocol: 264 err = -ESOCKTNOSUPPORT; 265 rcu_read_lock(); 266 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) { 267 268 err = 0; 269 /* Check the non-wild match. */ 270 if (protocol == answer->protocol) { 271 if (protocol != IPPROTO_IP) 272 break; 273 } else { 274 /* Check for the two wild cases. */ 275 if (IPPROTO_IP == protocol) { 276 protocol = answer->protocol; 277 break; 278 } 279 if (IPPROTO_IP == answer->protocol) 280 break; 281 } 282 err = -EPROTONOSUPPORT; 283 } 284 285 if (unlikely(err)) { 286 if (try_loading_module < 2) { 287 rcu_read_unlock(); 288 /* 289 * Be more specific, e.g. net-pf-2-proto-132-type-1 290 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) 291 */ 292 if (++try_loading_module == 1) 293 request_module("net-pf-%d-proto-%d-type-%d", 294 PF_INET, protocol, sock->type); 295 /* 296 * Fall back to generic, e.g. net-pf-2-proto-132 297 * (net-pf-PF_INET-proto-IPPROTO_SCTP) 298 */ 299 else 300 request_module("net-pf-%d-proto-%d", 301 PF_INET, protocol); 302 goto lookup_protocol; 303 } else 304 goto out_rcu_unlock; 305 } 306 307 err = -EPERM; 308 if (sock->type == SOCK_RAW && !kern && 309 !ns_capable(net->user_ns, CAP_NET_RAW)) 310 goto out_rcu_unlock; 311 312 sock->ops = answer->ops; 313 answer_prot = answer->prot; 314 answer_flags = answer->flags; 315 rcu_read_unlock(); 316 317 WARN_ON(!answer_prot->slab); 318 319 err = -ENOBUFS; 320 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot, kern); 321 if (!sk) 322 goto out; 323 324 err = 0; 325 if (INET_PROTOSW_REUSE & answer_flags) 326 sk->sk_reuse = SK_CAN_REUSE; 327 328 inet = inet_sk(sk); 329 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 330 331 inet->nodefrag = 0; 332 333 if (SOCK_RAW == sock->type) { 334 inet->inet_num = protocol; 335 if (IPPROTO_RAW == protocol) 336 inet->hdrincl = 1; 337 } 338 339 if (net->ipv4.sysctl_ip_no_pmtu_disc) 340 inet->pmtudisc = IP_PMTUDISC_DONT; 341 else 342 inet->pmtudisc = IP_PMTUDISC_WANT; 343 344 inet->inet_id = 0; 345 346 sock_init_data(sock, sk); 347 348 sk->sk_destruct = inet_sock_destruct; 349 sk->sk_protocol = protocol; 350 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 351 352 inet->uc_ttl = -1; 353 inet->mc_loop = 1; 354 inet->mc_ttl = 1; 355 inet->mc_all = 1; 356 inet->mc_index = 0; 357 inet->mc_list = NULL; 358 inet->rcv_tos = 0; 359 360 sk_refcnt_debug_inc(sk); 361 362 if (inet->inet_num) { 363 /* It assumes that any protocol which allows 364 * the user to assign a number at socket 365 * creation time automatically 366 * shares. 367 */ 368 inet->inet_sport = htons(inet->inet_num); 369 /* Add to protocol hash chains. */ 370 err = sk->sk_prot->hash(sk); 371 if (err) { 372 sk_common_release(sk); 373 goto out; 374 } 375 } 376 377 if (sk->sk_prot->init) { 378 err = sk->sk_prot->init(sk); 379 if (err) { 380 sk_common_release(sk); 381 goto out; 382 } 383 } 384 385 if (!kern) { 386 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk); 387 if (err) { 388 sk_common_release(sk); 389 goto out; 390 } 391 } 392 out: 393 return err; 394 out_rcu_unlock: 395 rcu_read_unlock(); 396 goto out; 397 } 398 399 400 /* 401 * The peer socket should always be NULL (or else). When we call this 402 * function we are destroying the object and from then on nobody 403 * should refer to it. 404 */ 405 int inet_release(struct socket *sock) 406 { 407 struct sock *sk = sock->sk; 408 409 if (sk) { 410 long timeout; 411 412 /* Applications forget to leave groups before exiting */ 413 ip_mc_drop_socket(sk); 414 415 /* If linger is set, we don't return until the close 416 * is complete. Otherwise we return immediately. The 417 * actually closing is done the same either way. 418 * 419 * If the close is due to the process exiting, we never 420 * linger.. 421 */ 422 timeout = 0; 423 if (sock_flag(sk, SOCK_LINGER) && 424 !(current->flags & PF_EXITING)) 425 timeout = sk->sk_lingertime; 426 sock->sk = NULL; 427 sk->sk_prot->close(sk, timeout); 428 } 429 return 0; 430 } 431 EXPORT_SYMBOL(inet_release); 432 433 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 434 { 435 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 436 struct sock *sk = sock->sk; 437 struct inet_sock *inet = inet_sk(sk); 438 struct net *net = sock_net(sk); 439 unsigned short snum; 440 int chk_addr_ret; 441 u32 tb_id = RT_TABLE_LOCAL; 442 int err; 443 444 /* If the socket has its own bind function then use it. (RAW) */ 445 if (sk->sk_prot->bind) { 446 err = sk->sk_prot->bind(sk, uaddr, addr_len); 447 goto out; 448 } 449 err = -EINVAL; 450 if (addr_len < sizeof(struct sockaddr_in)) 451 goto out; 452 453 if (addr->sin_family != AF_INET) { 454 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET) 455 * only if s_addr is INADDR_ANY. 456 */ 457 err = -EAFNOSUPPORT; 458 if (addr->sin_family != AF_UNSPEC || 459 addr->sin_addr.s_addr != htonl(INADDR_ANY)) 460 goto out; 461 } 462 463 tb_id = l3mdev_fib_table_by_index(net, sk->sk_bound_dev_if) ? : tb_id; 464 chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id); 465 466 /* Not specified by any standard per-se, however it breaks too 467 * many applications when removed. It is unfortunate since 468 * allowing applications to make a non-local bind solves 469 * several problems with systems using dynamic addressing. 470 * (ie. your servers still start up even if your ISDN link 471 * is temporarily down) 472 */ 473 err = -EADDRNOTAVAIL; 474 if (!net->ipv4.sysctl_ip_nonlocal_bind && 475 !(inet->freebind || inet->transparent) && 476 addr->sin_addr.s_addr != htonl(INADDR_ANY) && 477 chk_addr_ret != RTN_LOCAL && 478 chk_addr_ret != RTN_MULTICAST && 479 chk_addr_ret != RTN_BROADCAST) 480 goto out; 481 482 snum = ntohs(addr->sin_port); 483 err = -EACCES; 484 if (snum && snum < inet_prot_sock(net) && 485 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 486 goto out; 487 488 /* We keep a pair of addresses. rcv_saddr is the one 489 * used by hash lookups, and saddr is used for transmit. 490 * 491 * In the BSD API these are the same except where it 492 * would be illegal to use them (multicast/broadcast) in 493 * which case the sending device address is used. 494 */ 495 lock_sock(sk); 496 497 /* Check these errors (active socket, double bind). */ 498 err = -EINVAL; 499 if (sk->sk_state != TCP_CLOSE || inet->inet_num) 500 goto out_release_sock; 501 502 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 503 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 504 inet->inet_saddr = 0; /* Use device */ 505 506 /* Make sure we are allowed to bind here. */ 507 if ((snum || !inet->bind_address_no_port) && 508 sk->sk_prot->get_port(sk, snum)) { 509 inet->inet_saddr = inet->inet_rcv_saddr = 0; 510 err = -EADDRINUSE; 511 goto out_release_sock; 512 } 513 514 if (inet->inet_rcv_saddr) 515 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 516 if (snum) 517 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 518 inet->inet_sport = htons(inet->inet_num); 519 inet->inet_daddr = 0; 520 inet->inet_dport = 0; 521 sk_dst_reset(sk); 522 err = 0; 523 out_release_sock: 524 release_sock(sk); 525 out: 526 return err; 527 } 528 EXPORT_SYMBOL(inet_bind); 529 530 int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr, 531 int addr_len, int flags) 532 { 533 struct sock *sk = sock->sk; 534 535 if (addr_len < sizeof(uaddr->sa_family)) 536 return -EINVAL; 537 if (uaddr->sa_family == AF_UNSPEC) 538 return sk->sk_prot->disconnect(sk, flags); 539 540 if (!inet_sk(sk)->inet_num && inet_autobind(sk)) 541 return -EAGAIN; 542 return sk->sk_prot->connect(sk, uaddr, addr_len); 543 } 544 EXPORT_SYMBOL(inet_dgram_connect); 545 546 static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias) 547 { 548 DEFINE_WAIT_FUNC(wait, woken_wake_function); 549 550 add_wait_queue(sk_sleep(sk), &wait); 551 sk->sk_write_pending += writebias; 552 553 /* Basic assumption: if someone sets sk->sk_err, he _must_ 554 * change state of the socket from TCP_SYN_*. 555 * Connect() does not allow to get error notifications 556 * without closing the socket. 557 */ 558 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 559 release_sock(sk); 560 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo); 561 lock_sock(sk); 562 if (signal_pending(current) || !timeo) 563 break; 564 } 565 remove_wait_queue(sk_sleep(sk), &wait); 566 sk->sk_write_pending -= writebias; 567 return timeo; 568 } 569 570 /* 571 * Connect to a remote host. There is regrettably still a little 572 * TCP 'magic' in here. 573 */ 574 int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 575 int addr_len, int flags, int is_sendmsg) 576 { 577 struct sock *sk = sock->sk; 578 int err; 579 long timeo; 580 581 /* 582 * uaddr can be NULL and addr_len can be 0 if: 583 * sk is a TCP fastopen active socket and 584 * TCP_FASTOPEN_CONNECT sockopt is set and 585 * we already have a valid cookie for this socket. 586 * In this case, user can call write() after connect(). 587 * write() will invoke tcp_sendmsg_fastopen() which calls 588 * __inet_stream_connect(). 589 */ 590 if (uaddr) { 591 if (addr_len < sizeof(uaddr->sa_family)) 592 return -EINVAL; 593 594 if (uaddr->sa_family == AF_UNSPEC) { 595 err = sk->sk_prot->disconnect(sk, flags); 596 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 597 goto out; 598 } 599 } 600 601 switch (sock->state) { 602 default: 603 err = -EINVAL; 604 goto out; 605 case SS_CONNECTED: 606 err = -EISCONN; 607 goto out; 608 case SS_CONNECTING: 609 if (inet_sk(sk)->defer_connect) 610 err = is_sendmsg ? -EINPROGRESS : -EISCONN; 611 else 612 err = -EALREADY; 613 /* Fall out of switch with err, set for this state */ 614 break; 615 case SS_UNCONNECTED: 616 err = -EISCONN; 617 if (sk->sk_state != TCP_CLOSE) 618 goto out; 619 620 err = sk->sk_prot->connect(sk, uaddr, addr_len); 621 if (err < 0) 622 goto out; 623 624 sock->state = SS_CONNECTING; 625 626 if (!err && inet_sk(sk)->defer_connect) 627 goto out; 628 629 /* Just entered SS_CONNECTING state; the only 630 * difference is that return value in non-blocking 631 * case is EINPROGRESS, rather than EALREADY. 632 */ 633 err = -EINPROGRESS; 634 break; 635 } 636 637 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 638 639 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 640 int writebias = (sk->sk_protocol == IPPROTO_TCP) && 641 tcp_sk(sk)->fastopen_req && 642 tcp_sk(sk)->fastopen_req->data ? 1 : 0; 643 644 /* Error code is set above */ 645 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias)) 646 goto out; 647 648 err = sock_intr_errno(timeo); 649 if (signal_pending(current)) 650 goto out; 651 } 652 653 /* Connection was closed by RST, timeout, ICMP error 654 * or another process disconnected us. 655 */ 656 if (sk->sk_state == TCP_CLOSE) 657 goto sock_error; 658 659 /* sk->sk_err may be not zero now, if RECVERR was ordered by user 660 * and error was received after socket entered established state. 661 * Hence, it is handled normally after connect() return successfully. 662 */ 663 664 sock->state = SS_CONNECTED; 665 err = 0; 666 out: 667 return err; 668 669 sock_error: 670 err = sock_error(sk) ? : -ECONNABORTED; 671 sock->state = SS_UNCONNECTED; 672 if (sk->sk_prot->disconnect(sk, flags)) 673 sock->state = SS_DISCONNECTING; 674 goto out; 675 } 676 EXPORT_SYMBOL(__inet_stream_connect); 677 678 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 679 int addr_len, int flags) 680 { 681 int err; 682 683 lock_sock(sock->sk); 684 err = __inet_stream_connect(sock, uaddr, addr_len, flags, 0); 685 release_sock(sock->sk); 686 return err; 687 } 688 EXPORT_SYMBOL(inet_stream_connect); 689 690 /* 691 * Accept a pending connection. The TCP layer now gives BSD semantics. 692 */ 693 694 int inet_accept(struct socket *sock, struct socket *newsock, int flags, 695 bool kern) 696 { 697 struct sock *sk1 = sock->sk; 698 int err = -EINVAL; 699 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err, kern); 700 701 if (!sk2) 702 goto do_err; 703 704 lock_sock(sk2); 705 706 sock_rps_record_flow(sk2); 707 WARN_ON(!((1 << sk2->sk_state) & 708 (TCPF_ESTABLISHED | TCPF_SYN_RECV | 709 TCPF_CLOSE_WAIT | TCPF_CLOSE))); 710 711 sock_graft(sk2, newsock); 712 713 newsock->state = SS_CONNECTED; 714 err = 0; 715 release_sock(sk2); 716 do_err: 717 return err; 718 } 719 EXPORT_SYMBOL(inet_accept); 720 721 722 /* 723 * This does both peername and sockname. 724 */ 725 int inet_getname(struct socket *sock, struct sockaddr *uaddr, 726 int *uaddr_len, int peer) 727 { 728 struct sock *sk = sock->sk; 729 struct inet_sock *inet = inet_sk(sk); 730 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr); 731 732 sin->sin_family = AF_INET; 733 if (peer) { 734 if (!inet->inet_dport || 735 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 736 peer == 1)) 737 return -ENOTCONN; 738 sin->sin_port = inet->inet_dport; 739 sin->sin_addr.s_addr = inet->inet_daddr; 740 } else { 741 __be32 addr = inet->inet_rcv_saddr; 742 if (!addr) 743 addr = inet->inet_saddr; 744 sin->sin_port = inet->inet_sport; 745 sin->sin_addr.s_addr = addr; 746 } 747 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 748 *uaddr_len = sizeof(*sin); 749 return 0; 750 } 751 EXPORT_SYMBOL(inet_getname); 752 753 int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) 754 { 755 struct sock *sk = sock->sk; 756 757 sock_rps_record_flow(sk); 758 759 /* We may need to bind the socket. */ 760 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 761 inet_autobind(sk)) 762 return -EAGAIN; 763 764 return sk->sk_prot->sendmsg(sk, msg, size); 765 } 766 EXPORT_SYMBOL(inet_sendmsg); 767 768 ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, 769 size_t size, int flags) 770 { 771 struct sock *sk = sock->sk; 772 773 sock_rps_record_flow(sk); 774 775 /* We may need to bind the socket. */ 776 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 777 inet_autobind(sk)) 778 return -EAGAIN; 779 780 if (sk->sk_prot->sendpage) 781 return sk->sk_prot->sendpage(sk, page, offset, size, flags); 782 return sock_no_sendpage(sock, page, offset, size, flags); 783 } 784 EXPORT_SYMBOL(inet_sendpage); 785 786 int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 787 int flags) 788 { 789 struct sock *sk = sock->sk; 790 int addr_len = 0; 791 int err; 792 793 sock_rps_record_flow(sk); 794 795 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT, 796 flags & ~MSG_DONTWAIT, &addr_len); 797 if (err >= 0) 798 msg->msg_namelen = addr_len; 799 return err; 800 } 801 EXPORT_SYMBOL(inet_recvmsg); 802 803 int inet_shutdown(struct socket *sock, int how) 804 { 805 struct sock *sk = sock->sk; 806 int err = 0; 807 808 /* This should really check to make sure 809 * the socket is a TCP socket. (WHY AC...) 810 */ 811 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and 812 1->2 bit 2 snds. 813 2->3 */ 814 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ 815 return -EINVAL; 816 817 lock_sock(sk); 818 if (sock->state == SS_CONNECTING) { 819 if ((1 << sk->sk_state) & 820 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) 821 sock->state = SS_DISCONNECTING; 822 else 823 sock->state = SS_CONNECTED; 824 } 825 826 switch (sk->sk_state) { 827 case TCP_CLOSE: 828 err = -ENOTCONN; 829 /* Hack to wake up other listeners, who can poll for 830 POLLHUP, even on eg. unconnected UDP sockets -- RR */ 831 /* fall through */ 832 default: 833 sk->sk_shutdown |= how; 834 if (sk->sk_prot->shutdown) 835 sk->sk_prot->shutdown(sk, how); 836 break; 837 838 /* Remaining two branches are temporary solution for missing 839 * close() in multithreaded environment. It is _not_ a good idea, 840 * but we have no choice until close() is repaired at VFS level. 841 */ 842 case TCP_LISTEN: 843 if (!(how & RCV_SHUTDOWN)) 844 break; 845 /* fall through */ 846 case TCP_SYN_SENT: 847 err = sk->sk_prot->disconnect(sk, O_NONBLOCK); 848 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 849 break; 850 } 851 852 /* Wake up anyone sleeping in poll. */ 853 sk->sk_state_change(sk); 854 release_sock(sk); 855 return err; 856 } 857 EXPORT_SYMBOL(inet_shutdown); 858 859 /* 860 * ioctl() calls you can issue on an INET socket. Most of these are 861 * device configuration and stuff and very rarely used. Some ioctls 862 * pass on to the socket itself. 863 * 864 * NOTE: I like the idea of a module for the config stuff. ie ifconfig 865 * loads the devconfigure module does its configuring and unloads it. 866 * There's a good 20K of config code hanging around the kernel. 867 */ 868 869 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 870 { 871 struct sock *sk = sock->sk; 872 int err = 0; 873 struct net *net = sock_net(sk); 874 875 switch (cmd) { 876 case SIOCGSTAMP: 877 err = sock_get_timestamp(sk, (struct timeval __user *)arg); 878 break; 879 case SIOCGSTAMPNS: 880 err = sock_get_timestampns(sk, (struct timespec __user *)arg); 881 break; 882 case SIOCADDRT: 883 case SIOCDELRT: 884 case SIOCRTMSG: 885 err = ip_rt_ioctl(net, cmd, (void __user *)arg); 886 break; 887 case SIOCDARP: 888 case SIOCGARP: 889 case SIOCSARP: 890 err = arp_ioctl(net, cmd, (void __user *)arg); 891 break; 892 case SIOCGIFADDR: 893 case SIOCSIFADDR: 894 case SIOCGIFBRDADDR: 895 case SIOCSIFBRDADDR: 896 case SIOCGIFNETMASK: 897 case SIOCSIFNETMASK: 898 case SIOCGIFDSTADDR: 899 case SIOCSIFDSTADDR: 900 case SIOCSIFPFLAGS: 901 case SIOCGIFPFLAGS: 902 case SIOCSIFFLAGS: 903 err = devinet_ioctl(net, cmd, (void __user *)arg); 904 break; 905 default: 906 if (sk->sk_prot->ioctl) 907 err = sk->sk_prot->ioctl(sk, cmd, arg); 908 else 909 err = -ENOIOCTLCMD; 910 break; 911 } 912 return err; 913 } 914 EXPORT_SYMBOL(inet_ioctl); 915 916 #ifdef CONFIG_COMPAT 917 static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 918 { 919 struct sock *sk = sock->sk; 920 int err = -ENOIOCTLCMD; 921 922 if (sk->sk_prot->compat_ioctl) 923 err = sk->sk_prot->compat_ioctl(sk, cmd, arg); 924 925 return err; 926 } 927 #endif 928 929 const struct proto_ops inet_stream_ops = { 930 .family = PF_INET, 931 .owner = THIS_MODULE, 932 .release = inet_release, 933 .bind = inet_bind, 934 .connect = inet_stream_connect, 935 .socketpair = sock_no_socketpair, 936 .accept = inet_accept, 937 .getname = inet_getname, 938 .poll = tcp_poll, 939 .ioctl = inet_ioctl, 940 .listen = inet_listen, 941 .shutdown = inet_shutdown, 942 .setsockopt = sock_common_setsockopt, 943 .getsockopt = sock_common_getsockopt, 944 .sendmsg = inet_sendmsg, 945 .recvmsg = inet_recvmsg, 946 .mmap = sock_no_mmap, 947 .sendpage = inet_sendpage, 948 .splice_read = tcp_splice_read, 949 .read_sock = tcp_read_sock, 950 .sendmsg_locked = tcp_sendmsg_locked, 951 .sendpage_locked = tcp_sendpage_locked, 952 .peek_len = tcp_peek_len, 953 #ifdef CONFIG_COMPAT 954 .compat_setsockopt = compat_sock_common_setsockopt, 955 .compat_getsockopt = compat_sock_common_getsockopt, 956 .compat_ioctl = inet_compat_ioctl, 957 #endif 958 }; 959 EXPORT_SYMBOL(inet_stream_ops); 960 961 const struct proto_ops inet_dgram_ops = { 962 .family = PF_INET, 963 .owner = THIS_MODULE, 964 .release = inet_release, 965 .bind = inet_bind, 966 .connect = inet_dgram_connect, 967 .socketpair = sock_no_socketpair, 968 .accept = sock_no_accept, 969 .getname = inet_getname, 970 .poll = udp_poll, 971 .ioctl = inet_ioctl, 972 .listen = sock_no_listen, 973 .shutdown = inet_shutdown, 974 .setsockopt = sock_common_setsockopt, 975 .getsockopt = sock_common_getsockopt, 976 .sendmsg = inet_sendmsg, 977 .recvmsg = inet_recvmsg, 978 .mmap = sock_no_mmap, 979 .sendpage = inet_sendpage, 980 .set_peek_off = sk_set_peek_off, 981 #ifdef CONFIG_COMPAT 982 .compat_setsockopt = compat_sock_common_setsockopt, 983 .compat_getsockopt = compat_sock_common_getsockopt, 984 .compat_ioctl = inet_compat_ioctl, 985 #endif 986 }; 987 EXPORT_SYMBOL(inet_dgram_ops); 988 989 /* 990 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 991 * udp_poll 992 */ 993 static const struct proto_ops inet_sockraw_ops = { 994 .family = PF_INET, 995 .owner = THIS_MODULE, 996 .release = inet_release, 997 .bind = inet_bind, 998 .connect = inet_dgram_connect, 999 .socketpair = sock_no_socketpair, 1000 .accept = sock_no_accept, 1001 .getname = inet_getname, 1002 .poll = datagram_poll, 1003 .ioctl = inet_ioctl, 1004 .listen = sock_no_listen, 1005 .shutdown = inet_shutdown, 1006 .setsockopt = sock_common_setsockopt, 1007 .getsockopt = sock_common_getsockopt, 1008 .sendmsg = inet_sendmsg, 1009 .recvmsg = inet_recvmsg, 1010 .mmap = sock_no_mmap, 1011 .sendpage = inet_sendpage, 1012 #ifdef CONFIG_COMPAT 1013 .compat_setsockopt = compat_sock_common_setsockopt, 1014 .compat_getsockopt = compat_sock_common_getsockopt, 1015 .compat_ioctl = inet_compat_ioctl, 1016 #endif 1017 }; 1018 1019 static const struct net_proto_family inet_family_ops = { 1020 .family = PF_INET, 1021 .create = inet_create, 1022 .owner = THIS_MODULE, 1023 }; 1024 1025 /* Upon startup we insert all the elements in inetsw_array[] into 1026 * the linked list inetsw. 1027 */ 1028 static struct inet_protosw inetsw_array[] = 1029 { 1030 { 1031 .type = SOCK_STREAM, 1032 .protocol = IPPROTO_TCP, 1033 .prot = &tcp_prot, 1034 .ops = &inet_stream_ops, 1035 .flags = INET_PROTOSW_PERMANENT | 1036 INET_PROTOSW_ICSK, 1037 }, 1038 1039 { 1040 .type = SOCK_DGRAM, 1041 .protocol = IPPROTO_UDP, 1042 .prot = &udp_prot, 1043 .ops = &inet_dgram_ops, 1044 .flags = INET_PROTOSW_PERMANENT, 1045 }, 1046 1047 { 1048 .type = SOCK_DGRAM, 1049 .protocol = IPPROTO_ICMP, 1050 .prot = &ping_prot, 1051 .ops = &inet_sockraw_ops, 1052 .flags = INET_PROTOSW_REUSE, 1053 }, 1054 1055 { 1056 .type = SOCK_RAW, 1057 .protocol = IPPROTO_IP, /* wild card */ 1058 .prot = &raw_prot, 1059 .ops = &inet_sockraw_ops, 1060 .flags = INET_PROTOSW_REUSE, 1061 } 1062 }; 1063 1064 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) 1065 1066 void inet_register_protosw(struct inet_protosw *p) 1067 { 1068 struct list_head *lh; 1069 struct inet_protosw *answer; 1070 int protocol = p->protocol; 1071 struct list_head *last_perm; 1072 1073 spin_lock_bh(&inetsw_lock); 1074 1075 if (p->type >= SOCK_MAX) 1076 goto out_illegal; 1077 1078 /* If we are trying to override a permanent protocol, bail. */ 1079 last_perm = &inetsw[p->type]; 1080 list_for_each(lh, &inetsw[p->type]) { 1081 answer = list_entry(lh, struct inet_protosw, list); 1082 /* Check only the non-wild match. */ 1083 if ((INET_PROTOSW_PERMANENT & answer->flags) == 0) 1084 break; 1085 if (protocol == answer->protocol) 1086 goto out_permanent; 1087 last_perm = lh; 1088 } 1089 1090 /* Add the new entry after the last permanent entry if any, so that 1091 * the new entry does not override a permanent entry when matched with 1092 * a wild-card protocol. But it is allowed to override any existing 1093 * non-permanent entry. This means that when we remove this entry, the 1094 * system automatically returns to the old behavior. 1095 */ 1096 list_add_rcu(&p->list, last_perm); 1097 out: 1098 spin_unlock_bh(&inetsw_lock); 1099 1100 return; 1101 1102 out_permanent: 1103 pr_err("Attempt to override permanent protocol %d\n", protocol); 1104 goto out; 1105 1106 out_illegal: 1107 pr_err("Ignoring attempt to register invalid socket type %d\n", 1108 p->type); 1109 goto out; 1110 } 1111 EXPORT_SYMBOL(inet_register_protosw); 1112 1113 void inet_unregister_protosw(struct inet_protosw *p) 1114 { 1115 if (INET_PROTOSW_PERMANENT & p->flags) { 1116 pr_err("Attempt to unregister permanent protocol %d\n", 1117 p->protocol); 1118 } else { 1119 spin_lock_bh(&inetsw_lock); 1120 list_del_rcu(&p->list); 1121 spin_unlock_bh(&inetsw_lock); 1122 1123 synchronize_net(); 1124 } 1125 } 1126 EXPORT_SYMBOL(inet_unregister_protosw); 1127 1128 static int inet_sk_reselect_saddr(struct sock *sk) 1129 { 1130 struct inet_sock *inet = inet_sk(sk); 1131 __be32 old_saddr = inet->inet_saddr; 1132 __be32 daddr = inet->inet_daddr; 1133 struct flowi4 *fl4; 1134 struct rtable *rt; 1135 __be32 new_saddr; 1136 struct ip_options_rcu *inet_opt; 1137 1138 inet_opt = rcu_dereference_protected(inet->inet_opt, 1139 lockdep_sock_is_held(sk)); 1140 if (inet_opt && inet_opt->opt.srr) 1141 daddr = inet_opt->opt.faddr; 1142 1143 /* Query new route. */ 1144 fl4 = &inet->cork.fl.u.ip4; 1145 rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk), 1146 sk->sk_bound_dev_if, sk->sk_protocol, 1147 inet->inet_sport, inet->inet_dport, sk); 1148 if (IS_ERR(rt)) 1149 return PTR_ERR(rt); 1150 1151 sk_setup_caps(sk, &rt->dst); 1152 1153 new_saddr = fl4->saddr; 1154 1155 if (new_saddr == old_saddr) 1156 return 0; 1157 1158 if (sock_net(sk)->ipv4.sysctl_ip_dynaddr > 1) { 1159 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n", 1160 __func__, &old_saddr, &new_saddr); 1161 } 1162 1163 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr; 1164 1165 /* 1166 * XXX The only one ugly spot where we need to 1167 * XXX really change the sockets identity after 1168 * XXX it has entered the hashes. -DaveM 1169 * 1170 * Besides that, it does not check for connection 1171 * uniqueness. Wait for troubles. 1172 */ 1173 return __sk_prot_rehash(sk); 1174 } 1175 1176 int inet_sk_rebuild_header(struct sock *sk) 1177 { 1178 struct inet_sock *inet = inet_sk(sk); 1179 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); 1180 __be32 daddr; 1181 struct ip_options_rcu *inet_opt; 1182 struct flowi4 *fl4; 1183 int err; 1184 1185 /* Route is OK, nothing to do. */ 1186 if (rt) 1187 return 0; 1188 1189 /* Reroute. */ 1190 rcu_read_lock(); 1191 inet_opt = rcu_dereference(inet->inet_opt); 1192 daddr = inet->inet_daddr; 1193 if (inet_opt && inet_opt->opt.srr) 1194 daddr = inet_opt->opt.faddr; 1195 rcu_read_unlock(); 1196 fl4 = &inet->cork.fl.u.ip4; 1197 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr, 1198 inet->inet_dport, inet->inet_sport, 1199 sk->sk_protocol, RT_CONN_FLAGS(sk), 1200 sk->sk_bound_dev_if); 1201 if (!IS_ERR(rt)) { 1202 err = 0; 1203 sk_setup_caps(sk, &rt->dst); 1204 } else { 1205 err = PTR_ERR(rt); 1206 1207 /* Routing failed... */ 1208 sk->sk_route_caps = 0; 1209 /* 1210 * Other protocols have to map its equivalent state to TCP_SYN_SENT. 1211 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme 1212 */ 1213 if (!sock_net(sk)->ipv4.sysctl_ip_dynaddr || 1214 sk->sk_state != TCP_SYN_SENT || 1215 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 1216 (err = inet_sk_reselect_saddr(sk)) != 0) 1217 sk->sk_err_soft = -err; 1218 } 1219 1220 return err; 1221 } 1222 EXPORT_SYMBOL(inet_sk_rebuild_header); 1223 1224 void inet_sk_set_state(struct sock *sk, int state) 1225 { 1226 trace_inet_sock_set_state(sk, sk->sk_state, state); 1227 sk->sk_state = state; 1228 } 1229 EXPORT_SYMBOL(inet_sk_set_state); 1230 1231 void inet_sk_state_store(struct sock *sk, int newstate) 1232 { 1233 trace_inet_sock_set_state(sk, sk->sk_state, newstate); 1234 smp_store_release(&sk->sk_state, newstate); 1235 } 1236 1237 struct sk_buff *inet_gso_segment(struct sk_buff *skb, 1238 netdev_features_t features) 1239 { 1240 bool udpfrag = false, fixedid = false, gso_partial, encap; 1241 struct sk_buff *segs = ERR_PTR(-EINVAL); 1242 const struct net_offload *ops; 1243 unsigned int offset = 0; 1244 struct iphdr *iph; 1245 int proto, tot_len; 1246 int nhoff; 1247 int ihl; 1248 int id; 1249 1250 skb_reset_network_header(skb); 1251 nhoff = skb_network_header(skb) - skb_mac_header(skb); 1252 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1253 goto out; 1254 1255 iph = ip_hdr(skb); 1256 ihl = iph->ihl * 4; 1257 if (ihl < sizeof(*iph)) 1258 goto out; 1259 1260 id = ntohs(iph->id); 1261 proto = iph->protocol; 1262 1263 /* Warning: after this point, iph might be no longer valid */ 1264 if (unlikely(!pskb_may_pull(skb, ihl))) 1265 goto out; 1266 __skb_pull(skb, ihl); 1267 1268 encap = SKB_GSO_CB(skb)->encap_level > 0; 1269 if (encap) 1270 features &= skb->dev->hw_enc_features; 1271 SKB_GSO_CB(skb)->encap_level += ihl; 1272 1273 skb_reset_transport_header(skb); 1274 1275 segs = ERR_PTR(-EPROTONOSUPPORT); 1276 1277 if (!skb->encapsulation || encap) { 1278 udpfrag = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP); 1279 fixedid = !!(skb_shinfo(skb)->gso_type & SKB_GSO_TCP_FIXEDID); 1280 1281 /* fixed ID is invalid if DF bit is not set */ 1282 if (fixedid && !(ip_hdr(skb)->frag_off & htons(IP_DF))) 1283 goto out; 1284 } 1285 1286 ops = rcu_dereference(inet_offloads[proto]); 1287 if (likely(ops && ops->callbacks.gso_segment)) 1288 segs = ops->callbacks.gso_segment(skb, features); 1289 1290 if (IS_ERR_OR_NULL(segs)) 1291 goto out; 1292 1293 gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL); 1294 1295 skb = segs; 1296 do { 1297 iph = (struct iphdr *)(skb_mac_header(skb) + nhoff); 1298 if (udpfrag) { 1299 iph->frag_off = htons(offset >> 3); 1300 if (skb->next) 1301 iph->frag_off |= htons(IP_MF); 1302 offset += skb->len - nhoff - ihl; 1303 tot_len = skb->len - nhoff; 1304 } else if (skb_is_gso(skb)) { 1305 if (!fixedid) { 1306 iph->id = htons(id); 1307 id += skb_shinfo(skb)->gso_segs; 1308 } 1309 1310 if (gso_partial) 1311 tot_len = skb_shinfo(skb)->gso_size + 1312 SKB_GSO_CB(skb)->data_offset + 1313 skb->head - (unsigned char *)iph; 1314 else 1315 tot_len = skb->len - nhoff; 1316 } else { 1317 if (!fixedid) 1318 iph->id = htons(id++); 1319 tot_len = skb->len - nhoff; 1320 } 1321 iph->tot_len = htons(tot_len); 1322 ip_send_check(iph); 1323 if (encap) 1324 skb_reset_inner_headers(skb); 1325 skb->network_header = (u8 *)iph - skb->head; 1326 } while ((skb = skb->next)); 1327 1328 out: 1329 return segs; 1330 } 1331 EXPORT_SYMBOL(inet_gso_segment); 1332 1333 struct sk_buff **inet_gro_receive(struct sk_buff **head, struct sk_buff *skb) 1334 { 1335 const struct net_offload *ops; 1336 struct sk_buff **pp = NULL; 1337 struct sk_buff *p; 1338 const struct iphdr *iph; 1339 unsigned int hlen; 1340 unsigned int off; 1341 unsigned int id; 1342 int flush = 1; 1343 int proto; 1344 1345 off = skb_gro_offset(skb); 1346 hlen = off + sizeof(*iph); 1347 iph = skb_gro_header_fast(skb, off); 1348 if (skb_gro_header_hard(skb, hlen)) { 1349 iph = skb_gro_header_slow(skb, hlen, off); 1350 if (unlikely(!iph)) 1351 goto out; 1352 } 1353 1354 proto = iph->protocol; 1355 1356 rcu_read_lock(); 1357 ops = rcu_dereference(inet_offloads[proto]); 1358 if (!ops || !ops->callbacks.gro_receive) 1359 goto out_unlock; 1360 1361 if (*(u8 *)iph != 0x45) 1362 goto out_unlock; 1363 1364 if (ip_is_fragment(iph)) 1365 goto out_unlock; 1366 1367 if (unlikely(ip_fast_csum((u8 *)iph, 5))) 1368 goto out_unlock; 1369 1370 id = ntohl(*(__be32 *)&iph->id); 1371 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF)); 1372 id >>= 16; 1373 1374 for (p = *head; p; p = p->next) { 1375 struct iphdr *iph2; 1376 u16 flush_id; 1377 1378 if (!NAPI_GRO_CB(p)->same_flow) 1379 continue; 1380 1381 iph2 = (struct iphdr *)(p->data + off); 1382 /* The above works because, with the exception of the top 1383 * (inner most) layer, we only aggregate pkts with the same 1384 * hdr length so all the hdrs we'll need to verify will start 1385 * at the same offset. 1386 */ 1387 if ((iph->protocol ^ iph2->protocol) | 1388 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) | 1389 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) { 1390 NAPI_GRO_CB(p)->same_flow = 0; 1391 continue; 1392 } 1393 1394 /* All fields must match except length and checksum. */ 1395 NAPI_GRO_CB(p)->flush |= 1396 (iph->ttl ^ iph2->ttl) | 1397 (iph->tos ^ iph2->tos) | 1398 ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF)); 1399 1400 NAPI_GRO_CB(p)->flush |= flush; 1401 1402 /* We need to store of the IP ID check to be included later 1403 * when we can verify that this packet does in fact belong 1404 * to a given flow. 1405 */ 1406 flush_id = (u16)(id - ntohs(iph2->id)); 1407 1408 /* This bit of code makes it much easier for us to identify 1409 * the cases where we are doing atomic vs non-atomic IP ID 1410 * checks. Specifically an atomic check can return IP ID 1411 * values 0 - 0xFFFF, while a non-atomic check can only 1412 * return 0 or 0xFFFF. 1413 */ 1414 if (!NAPI_GRO_CB(p)->is_atomic || 1415 !(iph->frag_off & htons(IP_DF))) { 1416 flush_id ^= NAPI_GRO_CB(p)->count; 1417 flush_id = flush_id ? 0xFFFF : 0; 1418 } 1419 1420 /* If the previous IP ID value was based on an atomic 1421 * datagram we can overwrite the value and ignore it. 1422 */ 1423 if (NAPI_GRO_CB(skb)->is_atomic) 1424 NAPI_GRO_CB(p)->flush_id = flush_id; 1425 else 1426 NAPI_GRO_CB(p)->flush_id |= flush_id; 1427 } 1428 1429 NAPI_GRO_CB(skb)->is_atomic = !!(iph->frag_off & htons(IP_DF)); 1430 NAPI_GRO_CB(skb)->flush |= flush; 1431 skb_set_network_header(skb, off); 1432 /* The above will be needed by the transport layer if there is one 1433 * immediately following this IP hdr. 1434 */ 1435 1436 /* Note : No need to call skb_gro_postpull_rcsum() here, 1437 * as we already checked checksum over ipv4 header was 0 1438 */ 1439 skb_gro_pull(skb, sizeof(*iph)); 1440 skb_set_transport_header(skb, skb_gro_offset(skb)); 1441 1442 pp = call_gro_receive(ops->callbacks.gro_receive, head, skb); 1443 1444 out_unlock: 1445 rcu_read_unlock(); 1446 1447 out: 1448 skb_gro_flush_final(skb, pp, flush); 1449 1450 return pp; 1451 } 1452 EXPORT_SYMBOL(inet_gro_receive); 1453 1454 static struct sk_buff **ipip_gro_receive(struct sk_buff **head, 1455 struct sk_buff *skb) 1456 { 1457 if (NAPI_GRO_CB(skb)->encap_mark) { 1458 NAPI_GRO_CB(skb)->flush = 1; 1459 return NULL; 1460 } 1461 1462 NAPI_GRO_CB(skb)->encap_mark = 1; 1463 1464 return inet_gro_receive(head, skb); 1465 } 1466 1467 #define SECONDS_PER_DAY 86400 1468 1469 /* inet_current_timestamp - Return IP network timestamp 1470 * 1471 * Return milliseconds since midnight in network byte order. 1472 */ 1473 __be32 inet_current_timestamp(void) 1474 { 1475 u32 secs; 1476 u32 msecs; 1477 struct timespec64 ts; 1478 1479 ktime_get_real_ts64(&ts); 1480 1481 /* Get secs since midnight. */ 1482 (void)div_u64_rem(ts.tv_sec, SECONDS_PER_DAY, &secs); 1483 /* Convert to msecs. */ 1484 msecs = secs * MSEC_PER_SEC; 1485 /* Convert nsec to msec. */ 1486 msecs += (u32)ts.tv_nsec / NSEC_PER_MSEC; 1487 1488 /* Convert to network byte order. */ 1489 return htonl(msecs); 1490 } 1491 EXPORT_SYMBOL(inet_current_timestamp); 1492 1493 int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 1494 { 1495 if (sk->sk_family == AF_INET) 1496 return ip_recv_error(sk, msg, len, addr_len); 1497 #if IS_ENABLED(CONFIG_IPV6) 1498 if (sk->sk_family == AF_INET6) 1499 return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len); 1500 #endif 1501 return -EINVAL; 1502 } 1503 1504 int inet_gro_complete(struct sk_buff *skb, int nhoff) 1505 { 1506 __be16 newlen = htons(skb->len - nhoff); 1507 struct iphdr *iph = (struct iphdr *)(skb->data + nhoff); 1508 const struct net_offload *ops; 1509 int proto = iph->protocol; 1510 int err = -ENOSYS; 1511 1512 if (skb->encapsulation) { 1513 skb_set_inner_protocol(skb, cpu_to_be16(ETH_P_IP)); 1514 skb_set_inner_network_header(skb, nhoff); 1515 } 1516 1517 csum_replace2(&iph->check, iph->tot_len, newlen); 1518 iph->tot_len = newlen; 1519 1520 rcu_read_lock(); 1521 ops = rcu_dereference(inet_offloads[proto]); 1522 if (WARN_ON(!ops || !ops->callbacks.gro_complete)) 1523 goto out_unlock; 1524 1525 /* Only need to add sizeof(*iph) to get to the next hdr below 1526 * because any hdr with option will have been flushed in 1527 * inet_gro_receive(). 1528 */ 1529 err = ops->callbacks.gro_complete(skb, nhoff + sizeof(*iph)); 1530 1531 out_unlock: 1532 rcu_read_unlock(); 1533 1534 return err; 1535 } 1536 EXPORT_SYMBOL(inet_gro_complete); 1537 1538 static int ipip_gro_complete(struct sk_buff *skb, int nhoff) 1539 { 1540 skb->encapsulation = 1; 1541 skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4; 1542 return inet_gro_complete(skb, nhoff); 1543 } 1544 1545 int inet_ctl_sock_create(struct sock **sk, unsigned short family, 1546 unsigned short type, unsigned char protocol, 1547 struct net *net) 1548 { 1549 struct socket *sock; 1550 int rc = sock_create_kern(net, family, type, protocol, &sock); 1551 1552 if (rc == 0) { 1553 *sk = sock->sk; 1554 (*sk)->sk_allocation = GFP_ATOMIC; 1555 /* 1556 * Unhash it so that IP input processing does not even see it, 1557 * we do not wish this socket to see incoming packets. 1558 */ 1559 (*sk)->sk_prot->unhash(*sk); 1560 } 1561 return rc; 1562 } 1563 EXPORT_SYMBOL_GPL(inet_ctl_sock_create); 1564 1565 u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offt) 1566 { 1567 return *(((unsigned long *)per_cpu_ptr(mib, cpu)) + offt); 1568 } 1569 EXPORT_SYMBOL_GPL(snmp_get_cpu_field); 1570 1571 unsigned long snmp_fold_field(void __percpu *mib, int offt) 1572 { 1573 unsigned long res = 0; 1574 int i; 1575 1576 for_each_possible_cpu(i) 1577 res += snmp_get_cpu_field(mib, i, offt); 1578 return res; 1579 } 1580 EXPORT_SYMBOL_GPL(snmp_fold_field); 1581 1582 #if BITS_PER_LONG==32 1583 1584 u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offt, 1585 size_t syncp_offset) 1586 { 1587 void *bhptr; 1588 struct u64_stats_sync *syncp; 1589 u64 v; 1590 unsigned int start; 1591 1592 bhptr = per_cpu_ptr(mib, cpu); 1593 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset); 1594 do { 1595 start = u64_stats_fetch_begin_irq(syncp); 1596 v = *(((u64 *)bhptr) + offt); 1597 } while (u64_stats_fetch_retry_irq(syncp, start)); 1598 1599 return v; 1600 } 1601 EXPORT_SYMBOL_GPL(snmp_get_cpu_field64); 1602 1603 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset) 1604 { 1605 u64 res = 0; 1606 int cpu; 1607 1608 for_each_possible_cpu(cpu) { 1609 res += snmp_get_cpu_field64(mib, cpu, offt, syncp_offset); 1610 } 1611 return res; 1612 } 1613 EXPORT_SYMBOL_GPL(snmp_fold_field64); 1614 #endif 1615 1616 #ifdef CONFIG_IP_MULTICAST 1617 static const struct net_protocol igmp_protocol = { 1618 .handler = igmp_rcv, 1619 .netns_ok = 1, 1620 }; 1621 #endif 1622 1623 /* thinking of making this const? Don't. 1624 * early_demux can change based on sysctl. 1625 */ 1626 static struct net_protocol tcp_protocol = { 1627 .early_demux = tcp_v4_early_demux, 1628 .early_demux_handler = tcp_v4_early_demux, 1629 .handler = tcp_v4_rcv, 1630 .err_handler = tcp_v4_err, 1631 .no_policy = 1, 1632 .netns_ok = 1, 1633 .icmp_strict_tag_validation = 1, 1634 }; 1635 1636 /* thinking of making this const? Don't. 1637 * early_demux can change based on sysctl. 1638 */ 1639 static struct net_protocol udp_protocol = { 1640 .early_demux = udp_v4_early_demux, 1641 .early_demux_handler = udp_v4_early_demux, 1642 .handler = udp_rcv, 1643 .err_handler = udp_err, 1644 .no_policy = 1, 1645 .netns_ok = 1, 1646 }; 1647 1648 static const struct net_protocol icmp_protocol = { 1649 .handler = icmp_rcv, 1650 .err_handler = icmp_err, 1651 .no_policy = 1, 1652 .netns_ok = 1, 1653 }; 1654 1655 static __net_init int ipv4_mib_init_net(struct net *net) 1656 { 1657 int i; 1658 1659 net->mib.tcp_statistics = alloc_percpu(struct tcp_mib); 1660 if (!net->mib.tcp_statistics) 1661 goto err_tcp_mib; 1662 net->mib.ip_statistics = alloc_percpu(struct ipstats_mib); 1663 if (!net->mib.ip_statistics) 1664 goto err_ip_mib; 1665 1666 for_each_possible_cpu(i) { 1667 struct ipstats_mib *af_inet_stats; 1668 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i); 1669 u64_stats_init(&af_inet_stats->syncp); 1670 } 1671 1672 net->mib.net_statistics = alloc_percpu(struct linux_mib); 1673 if (!net->mib.net_statistics) 1674 goto err_net_mib; 1675 net->mib.udp_statistics = alloc_percpu(struct udp_mib); 1676 if (!net->mib.udp_statistics) 1677 goto err_udp_mib; 1678 net->mib.udplite_statistics = alloc_percpu(struct udp_mib); 1679 if (!net->mib.udplite_statistics) 1680 goto err_udplite_mib; 1681 net->mib.icmp_statistics = alloc_percpu(struct icmp_mib); 1682 if (!net->mib.icmp_statistics) 1683 goto err_icmp_mib; 1684 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib), 1685 GFP_KERNEL); 1686 if (!net->mib.icmpmsg_statistics) 1687 goto err_icmpmsg_mib; 1688 1689 tcp_mib_init(net); 1690 return 0; 1691 1692 err_icmpmsg_mib: 1693 free_percpu(net->mib.icmp_statistics); 1694 err_icmp_mib: 1695 free_percpu(net->mib.udplite_statistics); 1696 err_udplite_mib: 1697 free_percpu(net->mib.udp_statistics); 1698 err_udp_mib: 1699 free_percpu(net->mib.net_statistics); 1700 err_net_mib: 1701 free_percpu(net->mib.ip_statistics); 1702 err_ip_mib: 1703 free_percpu(net->mib.tcp_statistics); 1704 err_tcp_mib: 1705 return -ENOMEM; 1706 } 1707 1708 static __net_exit void ipv4_mib_exit_net(struct net *net) 1709 { 1710 kfree(net->mib.icmpmsg_statistics); 1711 free_percpu(net->mib.icmp_statistics); 1712 free_percpu(net->mib.udplite_statistics); 1713 free_percpu(net->mib.udp_statistics); 1714 free_percpu(net->mib.net_statistics); 1715 free_percpu(net->mib.ip_statistics); 1716 free_percpu(net->mib.tcp_statistics); 1717 } 1718 1719 static __net_initdata struct pernet_operations ipv4_mib_ops = { 1720 .init = ipv4_mib_init_net, 1721 .exit = ipv4_mib_exit_net, 1722 }; 1723 1724 static int __init init_ipv4_mibs(void) 1725 { 1726 return register_pernet_subsys(&ipv4_mib_ops); 1727 } 1728 1729 static __net_init int inet_init_net(struct net *net) 1730 { 1731 /* 1732 * Set defaults for local port range 1733 */ 1734 seqlock_init(&net->ipv4.ip_local_ports.lock); 1735 net->ipv4.ip_local_ports.range[0] = 32768; 1736 net->ipv4.ip_local_ports.range[1] = 60999; 1737 1738 seqlock_init(&net->ipv4.ping_group_range.lock); 1739 /* 1740 * Sane defaults - nobody may create ping sockets. 1741 * Boot scripts should set this to distro-specific group. 1742 */ 1743 net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1); 1744 net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0); 1745 1746 /* Default values for sysctl-controlled parameters. 1747 * We set them here, in case sysctl is not compiled. 1748 */ 1749 net->ipv4.sysctl_ip_default_ttl = IPDEFTTL; 1750 net->ipv4.sysctl_ip_dynaddr = 0; 1751 net->ipv4.sysctl_ip_early_demux = 1; 1752 net->ipv4.sysctl_udp_early_demux = 1; 1753 net->ipv4.sysctl_tcp_early_demux = 1; 1754 #ifdef CONFIG_SYSCTL 1755 net->ipv4.sysctl_ip_prot_sock = PROT_SOCK; 1756 #endif 1757 1758 /* Some igmp sysctl, whose values are always used */ 1759 net->ipv4.sysctl_igmp_max_memberships = 20; 1760 net->ipv4.sysctl_igmp_max_msf = 10; 1761 /* IGMP reports for link-local multicast groups are enabled by default */ 1762 net->ipv4.sysctl_igmp_llm_reports = 1; 1763 net->ipv4.sysctl_igmp_qrv = 2; 1764 1765 return 0; 1766 } 1767 1768 static __net_exit void inet_exit_net(struct net *net) 1769 { 1770 } 1771 1772 static __net_initdata struct pernet_operations af_inet_ops = { 1773 .init = inet_init_net, 1774 .exit = inet_exit_net, 1775 }; 1776 1777 static int __init init_inet_pernet_ops(void) 1778 { 1779 return register_pernet_subsys(&af_inet_ops); 1780 } 1781 1782 static int ipv4_proc_init(void); 1783 1784 /* 1785 * IP protocol layer initialiser 1786 */ 1787 1788 static struct packet_offload ip_packet_offload __read_mostly = { 1789 .type = cpu_to_be16(ETH_P_IP), 1790 .callbacks = { 1791 .gso_segment = inet_gso_segment, 1792 .gro_receive = inet_gro_receive, 1793 .gro_complete = inet_gro_complete, 1794 }, 1795 }; 1796 1797 static const struct net_offload ipip_offload = { 1798 .callbacks = { 1799 .gso_segment = inet_gso_segment, 1800 .gro_receive = ipip_gro_receive, 1801 .gro_complete = ipip_gro_complete, 1802 }, 1803 }; 1804 1805 static int __init ipip_offload_init(void) 1806 { 1807 return inet_add_offload(&ipip_offload, IPPROTO_IPIP); 1808 } 1809 1810 static int __init ipv4_offload_init(void) 1811 { 1812 /* 1813 * Add offloads 1814 */ 1815 if (udpv4_offload_init() < 0) 1816 pr_crit("%s: Cannot add UDP protocol offload\n", __func__); 1817 if (tcpv4_offload_init() < 0) 1818 pr_crit("%s: Cannot add TCP protocol offload\n", __func__); 1819 if (ipip_offload_init() < 0) 1820 pr_crit("%s: Cannot add IPIP protocol offload\n", __func__); 1821 1822 dev_add_offload(&ip_packet_offload); 1823 return 0; 1824 } 1825 1826 fs_initcall(ipv4_offload_init); 1827 1828 static struct packet_type ip_packet_type __read_mostly = { 1829 .type = cpu_to_be16(ETH_P_IP), 1830 .func = ip_rcv, 1831 }; 1832 1833 static int __init inet_init(void) 1834 { 1835 struct inet_protosw *q; 1836 struct list_head *r; 1837 int rc = -EINVAL; 1838 1839 sock_skb_cb_check_size(sizeof(struct inet_skb_parm)); 1840 1841 rc = proto_register(&tcp_prot, 1); 1842 if (rc) 1843 goto out; 1844 1845 rc = proto_register(&udp_prot, 1); 1846 if (rc) 1847 goto out_unregister_tcp_proto; 1848 1849 rc = proto_register(&raw_prot, 1); 1850 if (rc) 1851 goto out_unregister_udp_proto; 1852 1853 rc = proto_register(&ping_prot, 1); 1854 if (rc) 1855 goto out_unregister_raw_proto; 1856 1857 /* 1858 * Tell SOCKET that we are alive... 1859 */ 1860 1861 (void)sock_register(&inet_family_ops); 1862 1863 #ifdef CONFIG_SYSCTL 1864 ip_static_sysctl_init(); 1865 #endif 1866 1867 /* 1868 * Add all the base protocols. 1869 */ 1870 1871 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 1872 pr_crit("%s: Cannot add ICMP protocol\n", __func__); 1873 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) 1874 pr_crit("%s: Cannot add UDP protocol\n", __func__); 1875 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) 1876 pr_crit("%s: Cannot add TCP protocol\n", __func__); 1877 #ifdef CONFIG_IP_MULTICAST 1878 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 1879 pr_crit("%s: Cannot add IGMP protocol\n", __func__); 1880 #endif 1881 1882 /* Register the socket-side information for inet_create. */ 1883 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 1884 INIT_LIST_HEAD(r); 1885 1886 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 1887 inet_register_protosw(q); 1888 1889 /* 1890 * Set the ARP module up 1891 */ 1892 1893 arp_init(); 1894 1895 /* 1896 * Set the IP module up 1897 */ 1898 1899 ip_init(); 1900 1901 /* Setup TCP slab cache for open requests. */ 1902 tcp_init(); 1903 1904 /* Setup UDP memory threshold */ 1905 udp_init(); 1906 1907 /* Add UDP-Lite (RFC 3828) */ 1908 udplite4_register(); 1909 1910 ping_init(); 1911 1912 /* 1913 * Set the ICMP layer up 1914 */ 1915 1916 if (icmp_init() < 0) 1917 panic("Failed to create the ICMP control socket.\n"); 1918 1919 /* 1920 * Initialise the multicast router 1921 */ 1922 #if defined(CONFIG_IP_MROUTE) 1923 if (ip_mr_init()) 1924 pr_crit("%s: Cannot init ipv4 mroute\n", __func__); 1925 #endif 1926 1927 if (init_inet_pernet_ops()) 1928 pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__); 1929 /* 1930 * Initialise per-cpu ipv4 mibs 1931 */ 1932 1933 if (init_ipv4_mibs()) 1934 pr_crit("%s: Cannot init ipv4 mibs\n", __func__); 1935 1936 ipv4_proc_init(); 1937 1938 ipfrag_init(); 1939 1940 dev_add_pack(&ip_packet_type); 1941 1942 ip_tunnel_core_init(); 1943 1944 rc = 0; 1945 out: 1946 return rc; 1947 out_unregister_raw_proto: 1948 proto_unregister(&raw_prot); 1949 out_unregister_udp_proto: 1950 proto_unregister(&udp_prot); 1951 out_unregister_tcp_proto: 1952 proto_unregister(&tcp_prot); 1953 goto out; 1954 } 1955 1956 fs_initcall(inet_init); 1957 1958 /* ------------------------------------------------------------------------ */ 1959 1960 #ifdef CONFIG_PROC_FS 1961 static int __init ipv4_proc_init(void) 1962 { 1963 int rc = 0; 1964 1965 if (raw_proc_init()) 1966 goto out_raw; 1967 if (tcp4_proc_init()) 1968 goto out_tcp; 1969 if (udp4_proc_init()) 1970 goto out_udp; 1971 if (ping_proc_init()) 1972 goto out_ping; 1973 if (ip_misc_proc_init()) 1974 goto out_misc; 1975 out: 1976 return rc; 1977 out_misc: 1978 ping_proc_exit(); 1979 out_ping: 1980 udp4_proc_exit(); 1981 out_udp: 1982 tcp4_proc_exit(); 1983 out_tcp: 1984 raw_proc_exit(); 1985 out_raw: 1986 rc = -ENOMEM; 1987 goto out; 1988 } 1989 1990 #else /* CONFIG_PROC_FS */ 1991 static int __init ipv4_proc_init(void) 1992 { 1993 return 0; 1994 } 1995 #endif /* CONFIG_PROC_FS */ 1996