1 /* 2 * INET An implementation of the TCP/IP protocol suite for the LINUX 3 * operating system. INET is implemented using the BSD Socket 4 * interface as the means of communication with the user level. 5 * 6 * PF_INET protocol family socket handler. 7 * 8 * Authors: Ross Biro 9 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 10 * Florian La Roche, <flla@stud.uni-sb.de> 11 * Alan Cox, <A.Cox@swansea.ac.uk> 12 * 13 * Changes (see also sock.c) 14 * 15 * piggy, 16 * Karl Knutson : Socket protocol table 17 * A.N.Kuznetsov : Socket death error in accept(). 18 * John Richardson : Fix non blocking error in connect() 19 * so sockets that fail to connect 20 * don't return -EINPROGRESS. 21 * Alan Cox : Asynchronous I/O support 22 * Alan Cox : Keep correct socket pointer on sock 23 * structures 24 * when accept() ed 25 * Alan Cox : Semantics of SO_LINGER aren't state 26 * moved to close when you look carefully. 27 * With this fixed and the accept bug fixed 28 * some RPC stuff seems happier. 29 * Niibe Yutaka : 4.4BSD style write async I/O 30 * Alan Cox, 31 * Tony Gale : Fixed reuse semantics. 32 * Alan Cox : bind() shouldn't abort existing but dead 33 * sockets. Stops FTP netin:.. I hope. 34 * Alan Cox : bind() works correctly for RAW sockets. 35 * Note that FreeBSD at least was broken 36 * in this respect so be careful with 37 * compatibility tests... 38 * Alan Cox : routing cache support 39 * Alan Cox : memzero the socket structure for 40 * compactness. 41 * Matt Day : nonblock connect error handler 42 * Alan Cox : Allow large numbers of pending sockets 43 * (eg for big web sites), but only if 44 * specifically application requested. 45 * Alan Cox : New buffering throughout IP. Used 46 * dumbly. 47 * Alan Cox : New buffering now used smartly. 48 * Alan Cox : BSD rather than common sense 49 * interpretation of listen. 50 * Germano Caronni : Assorted small races. 51 * Alan Cox : sendmsg/recvmsg basic support. 52 * Alan Cox : Only sendmsg/recvmsg now supported. 53 * Alan Cox : Locked down bind (see security list). 54 * Alan Cox : Loosened bind a little. 55 * Mike McLagan : ADD/DEL DLCI Ioctls 56 * Willy Konynenberg : Transparent proxying support. 57 * David S. Miller : New socket lookup architecture. 58 * Some other random speedups. 59 * Cyrus Durgin : Cleaned up file for kmod hacks. 60 * Andi Kleen : Fix inet_stream_connect TCP race. 61 * 62 * This program is free software; you can redistribute it and/or 63 * modify it under the terms of the GNU General Public License 64 * as published by the Free Software Foundation; either version 65 * 2 of the License, or (at your option) any later version. 66 */ 67 68 #define pr_fmt(fmt) "IPv4: " fmt 69 70 #include <linux/err.h> 71 #include <linux/errno.h> 72 #include <linux/types.h> 73 #include <linux/socket.h> 74 #include <linux/in.h> 75 #include <linux/kernel.h> 76 #include <linux/module.h> 77 #include <linux/sched.h> 78 #include <linux/timer.h> 79 #include <linux/string.h> 80 #include <linux/sockios.h> 81 #include <linux/net.h> 82 #include <linux/capability.h> 83 #include <linux/fcntl.h> 84 #include <linux/mm.h> 85 #include <linux/interrupt.h> 86 #include <linux/stat.h> 87 #include <linux/init.h> 88 #include <linux/poll.h> 89 #include <linux/netfilter_ipv4.h> 90 #include <linux/random.h> 91 #include <linux/slab.h> 92 93 #include <asm/uaccess.h> 94 95 #include <linux/inet.h> 96 #include <linux/igmp.h> 97 #include <linux/inetdevice.h> 98 #include <linux/netdevice.h> 99 #include <net/checksum.h> 100 #include <net/ip.h> 101 #include <net/protocol.h> 102 #include <net/arp.h> 103 #include <net/route.h> 104 #include <net/ip_fib.h> 105 #include <net/inet_connection_sock.h> 106 #include <net/tcp.h> 107 #include <net/udp.h> 108 #include <net/udplite.h> 109 #include <net/ping.h> 110 #include <linux/skbuff.h> 111 #include <net/sock.h> 112 #include <net/raw.h> 113 #include <net/icmp.h> 114 #include <net/inet_common.h> 115 #include <net/ip_tunnels.h> 116 #include <net/xfrm.h> 117 #include <net/net_namespace.h> 118 #include <net/secure_seq.h> 119 #ifdef CONFIG_IP_MROUTE 120 #include <linux/mroute.h> 121 #endif 122 #include <net/vrf.h> 123 124 125 /* The inetsw table contains everything that inet_create needs to 126 * build a new socket. 127 */ 128 static struct list_head inetsw[SOCK_MAX]; 129 static DEFINE_SPINLOCK(inetsw_lock); 130 131 /* New destruction routine */ 132 133 void inet_sock_destruct(struct sock *sk) 134 { 135 struct inet_sock *inet = inet_sk(sk); 136 137 __skb_queue_purge(&sk->sk_receive_queue); 138 __skb_queue_purge(&sk->sk_error_queue); 139 140 sk_mem_reclaim(sk); 141 142 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) { 143 pr_err("Attempt to release TCP socket in state %d %p\n", 144 sk->sk_state, sk); 145 return; 146 } 147 if (!sock_flag(sk, SOCK_DEAD)) { 148 pr_err("Attempt to release alive inet socket %p\n", sk); 149 return; 150 } 151 152 WARN_ON(atomic_read(&sk->sk_rmem_alloc)); 153 WARN_ON(atomic_read(&sk->sk_wmem_alloc)); 154 WARN_ON(sk->sk_wmem_queued); 155 WARN_ON(sk->sk_forward_alloc); 156 157 kfree(rcu_dereference_protected(inet->inet_opt, 1)); 158 dst_release(rcu_dereference_check(sk->sk_dst_cache, 1)); 159 dst_release(sk->sk_rx_dst); 160 sk_refcnt_debug_dec(sk); 161 } 162 EXPORT_SYMBOL(inet_sock_destruct); 163 164 /* 165 * The routines beyond this point handle the behaviour of an AF_INET 166 * socket object. Mostly it punts to the subprotocols of IP to do 167 * the work. 168 */ 169 170 /* 171 * Automatically bind an unbound socket. 172 */ 173 174 static int inet_autobind(struct sock *sk) 175 { 176 struct inet_sock *inet; 177 /* We may need to bind the socket. */ 178 lock_sock(sk); 179 inet = inet_sk(sk); 180 if (!inet->inet_num) { 181 if (sk->sk_prot->get_port(sk, 0)) { 182 release_sock(sk); 183 return -EAGAIN; 184 } 185 inet->inet_sport = htons(inet->inet_num); 186 } 187 release_sock(sk); 188 return 0; 189 } 190 191 /* 192 * Move a socket into listening state. 193 */ 194 int inet_listen(struct socket *sock, int backlog) 195 { 196 struct sock *sk = sock->sk; 197 unsigned char old_state; 198 int err; 199 200 lock_sock(sk); 201 202 err = -EINVAL; 203 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM) 204 goto out; 205 206 old_state = sk->sk_state; 207 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN))) 208 goto out; 209 210 /* Really, if the socket is already in listen state 211 * we can only allow the backlog to be adjusted. 212 */ 213 if (old_state != TCP_LISTEN) { 214 /* Check special setups for testing purpose to enable TFO w/o 215 * requiring TCP_FASTOPEN sockopt. 216 * Note that only TCP sockets (SOCK_STREAM) will reach here. 217 * Also fastopenq may already been allocated because this 218 * socket was in TCP_LISTEN state previously but was 219 * shutdown() (rather than close()). 220 */ 221 if ((sysctl_tcp_fastopen & TFO_SERVER_ENABLE) != 0 && 222 !inet_csk(sk)->icsk_accept_queue.fastopenq) { 223 if ((sysctl_tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) != 0) 224 err = fastopen_init_queue(sk, backlog); 225 else if ((sysctl_tcp_fastopen & 226 TFO_SERVER_WO_SOCKOPT2) != 0) 227 err = fastopen_init_queue(sk, 228 ((uint)sysctl_tcp_fastopen) >> 16); 229 else 230 err = 0; 231 if (err) 232 goto out; 233 234 tcp_fastopen_init_key_once(true); 235 } 236 err = inet_csk_listen_start(sk, backlog); 237 if (err) 238 goto out; 239 } 240 sk->sk_max_ack_backlog = backlog; 241 err = 0; 242 243 out: 244 release_sock(sk); 245 return err; 246 } 247 EXPORT_SYMBOL(inet_listen); 248 249 /* 250 * Create an inet socket. 251 */ 252 253 static int inet_create(struct net *net, struct socket *sock, int protocol, 254 int kern) 255 { 256 struct sock *sk; 257 struct inet_protosw *answer; 258 struct inet_sock *inet; 259 struct proto *answer_prot; 260 unsigned char answer_flags; 261 int try_loading_module = 0; 262 int err; 263 264 sock->state = SS_UNCONNECTED; 265 266 /* Look for the requested type/protocol pair. */ 267 lookup_protocol: 268 err = -ESOCKTNOSUPPORT; 269 rcu_read_lock(); 270 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) { 271 272 err = 0; 273 /* Check the non-wild match. */ 274 if (protocol == answer->protocol) { 275 if (protocol != IPPROTO_IP) 276 break; 277 } else { 278 /* Check for the two wild cases. */ 279 if (IPPROTO_IP == protocol) { 280 protocol = answer->protocol; 281 break; 282 } 283 if (IPPROTO_IP == answer->protocol) 284 break; 285 } 286 err = -EPROTONOSUPPORT; 287 } 288 289 if (unlikely(err)) { 290 if (try_loading_module < 2) { 291 rcu_read_unlock(); 292 /* 293 * Be more specific, e.g. net-pf-2-proto-132-type-1 294 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) 295 */ 296 if (++try_loading_module == 1) 297 request_module("net-pf-%d-proto-%d-type-%d", 298 PF_INET, protocol, sock->type); 299 /* 300 * Fall back to generic, e.g. net-pf-2-proto-132 301 * (net-pf-PF_INET-proto-IPPROTO_SCTP) 302 */ 303 else 304 request_module("net-pf-%d-proto-%d", 305 PF_INET, protocol); 306 goto lookup_protocol; 307 } else 308 goto out_rcu_unlock; 309 } 310 311 err = -EPERM; 312 if (sock->type == SOCK_RAW && !kern && 313 !ns_capable(net->user_ns, CAP_NET_RAW)) 314 goto out_rcu_unlock; 315 316 sock->ops = answer->ops; 317 answer_prot = answer->prot; 318 answer_flags = answer->flags; 319 rcu_read_unlock(); 320 321 WARN_ON(!answer_prot->slab); 322 323 err = -ENOBUFS; 324 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot, kern); 325 if (!sk) 326 goto out; 327 328 err = 0; 329 if (INET_PROTOSW_REUSE & answer_flags) 330 sk->sk_reuse = SK_CAN_REUSE; 331 332 inet = inet_sk(sk); 333 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 334 335 inet->nodefrag = 0; 336 337 if (SOCK_RAW == sock->type) { 338 inet->inet_num = protocol; 339 if (IPPROTO_RAW == protocol) 340 inet->hdrincl = 1; 341 } 342 343 if (net->ipv4.sysctl_ip_no_pmtu_disc) 344 inet->pmtudisc = IP_PMTUDISC_DONT; 345 else 346 inet->pmtudisc = IP_PMTUDISC_WANT; 347 348 inet->inet_id = 0; 349 350 sock_init_data(sock, sk); 351 352 sk->sk_destruct = inet_sock_destruct; 353 sk->sk_protocol = protocol; 354 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 355 356 inet->uc_ttl = -1; 357 inet->mc_loop = 1; 358 inet->mc_ttl = 1; 359 inet->mc_all = 1; 360 inet->mc_index = 0; 361 inet->mc_list = NULL; 362 inet->rcv_tos = 0; 363 364 sk_refcnt_debug_inc(sk); 365 366 if (inet->inet_num) { 367 /* It assumes that any protocol which allows 368 * the user to assign a number at socket 369 * creation time automatically 370 * shares. 371 */ 372 inet->inet_sport = htons(inet->inet_num); 373 /* Add to protocol hash chains. */ 374 sk->sk_prot->hash(sk); 375 } 376 377 if (sk->sk_prot->init) { 378 err = sk->sk_prot->init(sk); 379 if (err) 380 sk_common_release(sk); 381 } 382 out: 383 return err; 384 out_rcu_unlock: 385 rcu_read_unlock(); 386 goto out; 387 } 388 389 390 /* 391 * The peer socket should always be NULL (or else). When we call this 392 * function we are destroying the object and from then on nobody 393 * should refer to it. 394 */ 395 int inet_release(struct socket *sock) 396 { 397 struct sock *sk = sock->sk; 398 399 if (sk) { 400 long timeout; 401 402 /* Applications forget to leave groups before exiting */ 403 ip_mc_drop_socket(sk); 404 405 /* If linger is set, we don't return until the close 406 * is complete. Otherwise we return immediately. The 407 * actually closing is done the same either way. 408 * 409 * If the close is due to the process exiting, we never 410 * linger.. 411 */ 412 timeout = 0; 413 if (sock_flag(sk, SOCK_LINGER) && 414 !(current->flags & PF_EXITING)) 415 timeout = sk->sk_lingertime; 416 sock->sk = NULL; 417 sk->sk_prot->close(sk, timeout); 418 } 419 return 0; 420 } 421 EXPORT_SYMBOL(inet_release); 422 423 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 424 { 425 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 426 struct sock *sk = sock->sk; 427 struct inet_sock *inet = inet_sk(sk); 428 struct net *net = sock_net(sk); 429 unsigned short snum; 430 int chk_addr_ret; 431 u32 tb_id = RT_TABLE_LOCAL; 432 int err; 433 434 /* If the socket has its own bind function then use it. (RAW) */ 435 if (sk->sk_prot->bind) { 436 err = sk->sk_prot->bind(sk, uaddr, addr_len); 437 goto out; 438 } 439 err = -EINVAL; 440 if (addr_len < sizeof(struct sockaddr_in)) 441 goto out; 442 443 if (addr->sin_family != AF_INET) { 444 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET) 445 * only if s_addr is INADDR_ANY. 446 */ 447 err = -EAFNOSUPPORT; 448 if (addr->sin_family != AF_UNSPEC || 449 addr->sin_addr.s_addr != htonl(INADDR_ANY)) 450 goto out; 451 } 452 453 tb_id = vrf_dev_table_ifindex(net, sk->sk_bound_dev_if) ? : tb_id; 454 chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id); 455 456 /* Not specified by any standard per-se, however it breaks too 457 * many applications when removed. It is unfortunate since 458 * allowing applications to make a non-local bind solves 459 * several problems with systems using dynamic addressing. 460 * (ie. your servers still start up even if your ISDN link 461 * is temporarily down) 462 */ 463 err = -EADDRNOTAVAIL; 464 if (!net->ipv4.sysctl_ip_nonlocal_bind && 465 !(inet->freebind || inet->transparent) && 466 addr->sin_addr.s_addr != htonl(INADDR_ANY) && 467 chk_addr_ret != RTN_LOCAL && 468 chk_addr_ret != RTN_MULTICAST && 469 chk_addr_ret != RTN_BROADCAST) 470 goto out; 471 472 snum = ntohs(addr->sin_port); 473 err = -EACCES; 474 if (snum && snum < PROT_SOCK && 475 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 476 goto out; 477 478 /* We keep a pair of addresses. rcv_saddr is the one 479 * used by hash lookups, and saddr is used for transmit. 480 * 481 * In the BSD API these are the same except where it 482 * would be illegal to use them (multicast/broadcast) in 483 * which case the sending device address is used. 484 */ 485 lock_sock(sk); 486 487 /* Check these errors (active socket, double bind). */ 488 err = -EINVAL; 489 if (sk->sk_state != TCP_CLOSE || inet->inet_num) 490 goto out_release_sock; 491 492 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 493 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 494 inet->inet_saddr = 0; /* Use device */ 495 496 /* Make sure we are allowed to bind here. */ 497 if ((snum || !inet->bind_address_no_port) && 498 sk->sk_prot->get_port(sk, snum)) { 499 inet->inet_saddr = inet->inet_rcv_saddr = 0; 500 err = -EADDRINUSE; 501 goto out_release_sock; 502 } 503 504 if (inet->inet_rcv_saddr) 505 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 506 if (snum) 507 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 508 inet->inet_sport = htons(inet->inet_num); 509 inet->inet_daddr = 0; 510 inet->inet_dport = 0; 511 sk_dst_reset(sk); 512 err = 0; 513 out_release_sock: 514 release_sock(sk); 515 out: 516 return err; 517 } 518 EXPORT_SYMBOL(inet_bind); 519 520 int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr, 521 int addr_len, int flags) 522 { 523 struct sock *sk = sock->sk; 524 525 if (addr_len < sizeof(uaddr->sa_family)) 526 return -EINVAL; 527 if (uaddr->sa_family == AF_UNSPEC) 528 return sk->sk_prot->disconnect(sk, flags); 529 530 if (!inet_sk(sk)->inet_num && inet_autobind(sk)) 531 return -EAGAIN; 532 return sk->sk_prot->connect(sk, uaddr, addr_len); 533 } 534 EXPORT_SYMBOL(inet_dgram_connect); 535 536 static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias) 537 { 538 DEFINE_WAIT(wait); 539 540 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 541 sk->sk_write_pending += writebias; 542 543 /* Basic assumption: if someone sets sk->sk_err, he _must_ 544 * change state of the socket from TCP_SYN_*. 545 * Connect() does not allow to get error notifications 546 * without closing the socket. 547 */ 548 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 549 release_sock(sk); 550 timeo = schedule_timeout(timeo); 551 lock_sock(sk); 552 if (signal_pending(current) || !timeo) 553 break; 554 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 555 } 556 finish_wait(sk_sleep(sk), &wait); 557 sk->sk_write_pending -= writebias; 558 return timeo; 559 } 560 561 /* 562 * Connect to a remote host. There is regrettably still a little 563 * TCP 'magic' in here. 564 */ 565 int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 566 int addr_len, int flags) 567 { 568 struct sock *sk = sock->sk; 569 int err; 570 long timeo; 571 572 if (addr_len < sizeof(uaddr->sa_family)) 573 return -EINVAL; 574 575 if (uaddr->sa_family == AF_UNSPEC) { 576 err = sk->sk_prot->disconnect(sk, flags); 577 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 578 goto out; 579 } 580 581 switch (sock->state) { 582 default: 583 err = -EINVAL; 584 goto out; 585 case SS_CONNECTED: 586 err = -EISCONN; 587 goto out; 588 case SS_CONNECTING: 589 err = -EALREADY; 590 /* Fall out of switch with err, set for this state */ 591 break; 592 case SS_UNCONNECTED: 593 err = -EISCONN; 594 if (sk->sk_state != TCP_CLOSE) 595 goto out; 596 597 err = sk->sk_prot->connect(sk, uaddr, addr_len); 598 if (err < 0) 599 goto out; 600 601 sock->state = SS_CONNECTING; 602 603 /* Just entered SS_CONNECTING state; the only 604 * difference is that return value in non-blocking 605 * case is EINPROGRESS, rather than EALREADY. 606 */ 607 err = -EINPROGRESS; 608 break; 609 } 610 611 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 612 613 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 614 int writebias = (sk->sk_protocol == IPPROTO_TCP) && 615 tcp_sk(sk)->fastopen_req && 616 tcp_sk(sk)->fastopen_req->data ? 1 : 0; 617 618 /* Error code is set above */ 619 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias)) 620 goto out; 621 622 err = sock_intr_errno(timeo); 623 if (signal_pending(current)) 624 goto out; 625 } 626 627 /* Connection was closed by RST, timeout, ICMP error 628 * or another process disconnected us. 629 */ 630 if (sk->sk_state == TCP_CLOSE) 631 goto sock_error; 632 633 /* sk->sk_err may be not zero now, if RECVERR was ordered by user 634 * and error was received after socket entered established state. 635 * Hence, it is handled normally after connect() return successfully. 636 */ 637 638 sock->state = SS_CONNECTED; 639 err = 0; 640 out: 641 return err; 642 643 sock_error: 644 err = sock_error(sk) ? : -ECONNABORTED; 645 sock->state = SS_UNCONNECTED; 646 if (sk->sk_prot->disconnect(sk, flags)) 647 sock->state = SS_DISCONNECTING; 648 goto out; 649 } 650 EXPORT_SYMBOL(__inet_stream_connect); 651 652 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 653 int addr_len, int flags) 654 { 655 int err; 656 657 lock_sock(sock->sk); 658 err = __inet_stream_connect(sock, uaddr, addr_len, flags); 659 release_sock(sock->sk); 660 return err; 661 } 662 EXPORT_SYMBOL(inet_stream_connect); 663 664 /* 665 * Accept a pending connection. The TCP layer now gives BSD semantics. 666 */ 667 668 int inet_accept(struct socket *sock, struct socket *newsock, int flags) 669 { 670 struct sock *sk1 = sock->sk; 671 int err = -EINVAL; 672 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err); 673 674 if (!sk2) 675 goto do_err; 676 677 lock_sock(sk2); 678 679 sock_rps_record_flow(sk2); 680 WARN_ON(!((1 << sk2->sk_state) & 681 (TCPF_ESTABLISHED | TCPF_SYN_RECV | 682 TCPF_CLOSE_WAIT | TCPF_CLOSE))); 683 684 sock_graft(sk2, newsock); 685 686 newsock->state = SS_CONNECTED; 687 err = 0; 688 release_sock(sk2); 689 do_err: 690 return err; 691 } 692 EXPORT_SYMBOL(inet_accept); 693 694 695 /* 696 * This does both peername and sockname. 697 */ 698 int inet_getname(struct socket *sock, struct sockaddr *uaddr, 699 int *uaddr_len, int peer) 700 { 701 struct sock *sk = sock->sk; 702 struct inet_sock *inet = inet_sk(sk); 703 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr); 704 705 sin->sin_family = AF_INET; 706 if (peer) { 707 if (!inet->inet_dport || 708 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 709 peer == 1)) 710 return -ENOTCONN; 711 sin->sin_port = inet->inet_dport; 712 sin->sin_addr.s_addr = inet->inet_daddr; 713 } else { 714 __be32 addr = inet->inet_rcv_saddr; 715 if (!addr) 716 addr = inet->inet_saddr; 717 sin->sin_port = inet->inet_sport; 718 sin->sin_addr.s_addr = addr; 719 } 720 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 721 *uaddr_len = sizeof(*sin); 722 return 0; 723 } 724 EXPORT_SYMBOL(inet_getname); 725 726 int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) 727 { 728 struct sock *sk = sock->sk; 729 730 sock_rps_record_flow(sk); 731 732 /* We may need to bind the socket. */ 733 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 734 inet_autobind(sk)) 735 return -EAGAIN; 736 737 return sk->sk_prot->sendmsg(sk, msg, size); 738 } 739 EXPORT_SYMBOL(inet_sendmsg); 740 741 ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, 742 size_t size, int flags) 743 { 744 struct sock *sk = sock->sk; 745 746 sock_rps_record_flow(sk); 747 748 /* We may need to bind the socket. */ 749 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 750 inet_autobind(sk)) 751 return -EAGAIN; 752 753 if (sk->sk_prot->sendpage) 754 return sk->sk_prot->sendpage(sk, page, offset, size, flags); 755 return sock_no_sendpage(sock, page, offset, size, flags); 756 } 757 EXPORT_SYMBOL(inet_sendpage); 758 759 int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 760 int flags) 761 { 762 struct sock *sk = sock->sk; 763 int addr_len = 0; 764 int err; 765 766 sock_rps_record_flow(sk); 767 768 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT, 769 flags & ~MSG_DONTWAIT, &addr_len); 770 if (err >= 0) 771 msg->msg_namelen = addr_len; 772 return err; 773 } 774 EXPORT_SYMBOL(inet_recvmsg); 775 776 int inet_shutdown(struct socket *sock, int how) 777 { 778 struct sock *sk = sock->sk; 779 int err = 0; 780 781 /* This should really check to make sure 782 * the socket is a TCP socket. (WHY AC...) 783 */ 784 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and 785 1->2 bit 2 snds. 786 2->3 */ 787 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ 788 return -EINVAL; 789 790 lock_sock(sk); 791 if (sock->state == SS_CONNECTING) { 792 if ((1 << sk->sk_state) & 793 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) 794 sock->state = SS_DISCONNECTING; 795 else 796 sock->state = SS_CONNECTED; 797 } 798 799 switch (sk->sk_state) { 800 case TCP_CLOSE: 801 err = -ENOTCONN; 802 /* Hack to wake up other listeners, who can poll for 803 POLLHUP, even on eg. unconnected UDP sockets -- RR */ 804 default: 805 sk->sk_shutdown |= how; 806 if (sk->sk_prot->shutdown) 807 sk->sk_prot->shutdown(sk, how); 808 break; 809 810 /* Remaining two branches are temporary solution for missing 811 * close() in multithreaded environment. It is _not_ a good idea, 812 * but we have no choice until close() is repaired at VFS level. 813 */ 814 case TCP_LISTEN: 815 if (!(how & RCV_SHUTDOWN)) 816 break; 817 /* Fall through */ 818 case TCP_SYN_SENT: 819 err = sk->sk_prot->disconnect(sk, O_NONBLOCK); 820 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 821 break; 822 } 823 824 /* Wake up anyone sleeping in poll. */ 825 sk->sk_state_change(sk); 826 release_sock(sk); 827 return err; 828 } 829 EXPORT_SYMBOL(inet_shutdown); 830 831 /* 832 * ioctl() calls you can issue on an INET socket. Most of these are 833 * device configuration and stuff and very rarely used. Some ioctls 834 * pass on to the socket itself. 835 * 836 * NOTE: I like the idea of a module for the config stuff. ie ifconfig 837 * loads the devconfigure module does its configuring and unloads it. 838 * There's a good 20K of config code hanging around the kernel. 839 */ 840 841 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 842 { 843 struct sock *sk = sock->sk; 844 int err = 0; 845 struct net *net = sock_net(sk); 846 847 switch (cmd) { 848 case SIOCGSTAMP: 849 err = sock_get_timestamp(sk, (struct timeval __user *)arg); 850 break; 851 case SIOCGSTAMPNS: 852 err = sock_get_timestampns(sk, (struct timespec __user *)arg); 853 break; 854 case SIOCADDRT: 855 case SIOCDELRT: 856 case SIOCRTMSG: 857 err = ip_rt_ioctl(net, cmd, (void __user *)arg); 858 break; 859 case SIOCDARP: 860 case SIOCGARP: 861 case SIOCSARP: 862 err = arp_ioctl(net, cmd, (void __user *)arg); 863 break; 864 case SIOCGIFADDR: 865 case SIOCSIFADDR: 866 case SIOCGIFBRDADDR: 867 case SIOCSIFBRDADDR: 868 case SIOCGIFNETMASK: 869 case SIOCSIFNETMASK: 870 case SIOCGIFDSTADDR: 871 case SIOCSIFDSTADDR: 872 case SIOCSIFPFLAGS: 873 case SIOCGIFPFLAGS: 874 case SIOCSIFFLAGS: 875 err = devinet_ioctl(net, cmd, (void __user *)arg); 876 break; 877 default: 878 if (sk->sk_prot->ioctl) 879 err = sk->sk_prot->ioctl(sk, cmd, arg); 880 else 881 err = -ENOIOCTLCMD; 882 break; 883 } 884 return err; 885 } 886 EXPORT_SYMBOL(inet_ioctl); 887 888 #ifdef CONFIG_COMPAT 889 static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 890 { 891 struct sock *sk = sock->sk; 892 int err = -ENOIOCTLCMD; 893 894 if (sk->sk_prot->compat_ioctl) 895 err = sk->sk_prot->compat_ioctl(sk, cmd, arg); 896 897 return err; 898 } 899 #endif 900 901 const struct proto_ops inet_stream_ops = { 902 .family = PF_INET, 903 .owner = THIS_MODULE, 904 .release = inet_release, 905 .bind = inet_bind, 906 .connect = inet_stream_connect, 907 .socketpair = sock_no_socketpair, 908 .accept = inet_accept, 909 .getname = inet_getname, 910 .poll = tcp_poll, 911 .ioctl = inet_ioctl, 912 .listen = inet_listen, 913 .shutdown = inet_shutdown, 914 .setsockopt = sock_common_setsockopt, 915 .getsockopt = sock_common_getsockopt, 916 .sendmsg = inet_sendmsg, 917 .recvmsg = inet_recvmsg, 918 .mmap = sock_no_mmap, 919 .sendpage = inet_sendpage, 920 .splice_read = tcp_splice_read, 921 #ifdef CONFIG_COMPAT 922 .compat_setsockopt = compat_sock_common_setsockopt, 923 .compat_getsockopt = compat_sock_common_getsockopt, 924 .compat_ioctl = inet_compat_ioctl, 925 #endif 926 }; 927 EXPORT_SYMBOL(inet_stream_ops); 928 929 const struct proto_ops inet_dgram_ops = { 930 .family = PF_INET, 931 .owner = THIS_MODULE, 932 .release = inet_release, 933 .bind = inet_bind, 934 .connect = inet_dgram_connect, 935 .socketpair = sock_no_socketpair, 936 .accept = sock_no_accept, 937 .getname = inet_getname, 938 .poll = udp_poll, 939 .ioctl = inet_ioctl, 940 .listen = sock_no_listen, 941 .shutdown = inet_shutdown, 942 .setsockopt = sock_common_setsockopt, 943 .getsockopt = sock_common_getsockopt, 944 .sendmsg = inet_sendmsg, 945 .recvmsg = inet_recvmsg, 946 .mmap = sock_no_mmap, 947 .sendpage = inet_sendpage, 948 #ifdef CONFIG_COMPAT 949 .compat_setsockopt = compat_sock_common_setsockopt, 950 .compat_getsockopt = compat_sock_common_getsockopt, 951 .compat_ioctl = inet_compat_ioctl, 952 #endif 953 }; 954 EXPORT_SYMBOL(inet_dgram_ops); 955 956 /* 957 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 958 * udp_poll 959 */ 960 static const struct proto_ops inet_sockraw_ops = { 961 .family = PF_INET, 962 .owner = THIS_MODULE, 963 .release = inet_release, 964 .bind = inet_bind, 965 .connect = inet_dgram_connect, 966 .socketpair = sock_no_socketpair, 967 .accept = sock_no_accept, 968 .getname = inet_getname, 969 .poll = datagram_poll, 970 .ioctl = inet_ioctl, 971 .listen = sock_no_listen, 972 .shutdown = inet_shutdown, 973 .setsockopt = sock_common_setsockopt, 974 .getsockopt = sock_common_getsockopt, 975 .sendmsg = inet_sendmsg, 976 .recvmsg = inet_recvmsg, 977 .mmap = sock_no_mmap, 978 .sendpage = inet_sendpage, 979 #ifdef CONFIG_COMPAT 980 .compat_setsockopt = compat_sock_common_setsockopt, 981 .compat_getsockopt = compat_sock_common_getsockopt, 982 .compat_ioctl = inet_compat_ioctl, 983 #endif 984 }; 985 986 static const struct net_proto_family inet_family_ops = { 987 .family = PF_INET, 988 .create = inet_create, 989 .owner = THIS_MODULE, 990 }; 991 992 /* Upon startup we insert all the elements in inetsw_array[] into 993 * the linked list inetsw. 994 */ 995 static struct inet_protosw inetsw_array[] = 996 { 997 { 998 .type = SOCK_STREAM, 999 .protocol = IPPROTO_TCP, 1000 .prot = &tcp_prot, 1001 .ops = &inet_stream_ops, 1002 .flags = INET_PROTOSW_PERMANENT | 1003 INET_PROTOSW_ICSK, 1004 }, 1005 1006 { 1007 .type = SOCK_DGRAM, 1008 .protocol = IPPROTO_UDP, 1009 .prot = &udp_prot, 1010 .ops = &inet_dgram_ops, 1011 .flags = INET_PROTOSW_PERMANENT, 1012 }, 1013 1014 { 1015 .type = SOCK_DGRAM, 1016 .protocol = IPPROTO_ICMP, 1017 .prot = &ping_prot, 1018 .ops = &inet_dgram_ops, 1019 .flags = INET_PROTOSW_REUSE, 1020 }, 1021 1022 { 1023 .type = SOCK_RAW, 1024 .protocol = IPPROTO_IP, /* wild card */ 1025 .prot = &raw_prot, 1026 .ops = &inet_sockraw_ops, 1027 .flags = INET_PROTOSW_REUSE, 1028 } 1029 }; 1030 1031 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) 1032 1033 void inet_register_protosw(struct inet_protosw *p) 1034 { 1035 struct list_head *lh; 1036 struct inet_protosw *answer; 1037 int protocol = p->protocol; 1038 struct list_head *last_perm; 1039 1040 spin_lock_bh(&inetsw_lock); 1041 1042 if (p->type >= SOCK_MAX) 1043 goto out_illegal; 1044 1045 /* If we are trying to override a permanent protocol, bail. */ 1046 last_perm = &inetsw[p->type]; 1047 list_for_each(lh, &inetsw[p->type]) { 1048 answer = list_entry(lh, struct inet_protosw, list); 1049 /* Check only the non-wild match. */ 1050 if ((INET_PROTOSW_PERMANENT & answer->flags) == 0) 1051 break; 1052 if (protocol == answer->protocol) 1053 goto out_permanent; 1054 last_perm = lh; 1055 } 1056 1057 /* Add the new entry after the last permanent entry if any, so that 1058 * the new entry does not override a permanent entry when matched with 1059 * a wild-card protocol. But it is allowed to override any existing 1060 * non-permanent entry. This means that when we remove this entry, the 1061 * system automatically returns to the old behavior. 1062 */ 1063 list_add_rcu(&p->list, last_perm); 1064 out: 1065 spin_unlock_bh(&inetsw_lock); 1066 1067 return; 1068 1069 out_permanent: 1070 pr_err("Attempt to override permanent protocol %d\n", protocol); 1071 goto out; 1072 1073 out_illegal: 1074 pr_err("Ignoring attempt to register invalid socket type %d\n", 1075 p->type); 1076 goto out; 1077 } 1078 EXPORT_SYMBOL(inet_register_protosw); 1079 1080 void inet_unregister_protosw(struct inet_protosw *p) 1081 { 1082 if (INET_PROTOSW_PERMANENT & p->flags) { 1083 pr_err("Attempt to unregister permanent protocol %d\n", 1084 p->protocol); 1085 } else { 1086 spin_lock_bh(&inetsw_lock); 1087 list_del_rcu(&p->list); 1088 spin_unlock_bh(&inetsw_lock); 1089 1090 synchronize_net(); 1091 } 1092 } 1093 EXPORT_SYMBOL(inet_unregister_protosw); 1094 1095 /* 1096 * Shall we try to damage output packets if routing dev changes? 1097 */ 1098 1099 int sysctl_ip_dynaddr __read_mostly; 1100 1101 static int inet_sk_reselect_saddr(struct sock *sk) 1102 { 1103 struct inet_sock *inet = inet_sk(sk); 1104 __be32 old_saddr = inet->inet_saddr; 1105 __be32 daddr = inet->inet_daddr; 1106 struct flowi4 *fl4; 1107 struct rtable *rt; 1108 __be32 new_saddr; 1109 struct ip_options_rcu *inet_opt; 1110 1111 inet_opt = rcu_dereference_protected(inet->inet_opt, 1112 sock_owned_by_user(sk)); 1113 if (inet_opt && inet_opt->opt.srr) 1114 daddr = inet_opt->opt.faddr; 1115 1116 /* Query new route. */ 1117 fl4 = &inet->cork.fl.u.ip4; 1118 rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk), 1119 sk->sk_bound_dev_if, sk->sk_protocol, 1120 inet->inet_sport, inet->inet_dport, sk); 1121 if (IS_ERR(rt)) 1122 return PTR_ERR(rt); 1123 1124 sk_setup_caps(sk, &rt->dst); 1125 1126 new_saddr = fl4->saddr; 1127 1128 if (new_saddr == old_saddr) 1129 return 0; 1130 1131 if (sysctl_ip_dynaddr > 1) { 1132 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n", 1133 __func__, &old_saddr, &new_saddr); 1134 } 1135 1136 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr; 1137 1138 /* 1139 * XXX The only one ugly spot where we need to 1140 * XXX really change the sockets identity after 1141 * XXX it has entered the hashes. -DaveM 1142 * 1143 * Besides that, it does not check for connection 1144 * uniqueness. Wait for troubles. 1145 */ 1146 __sk_prot_rehash(sk); 1147 return 0; 1148 } 1149 1150 int inet_sk_rebuild_header(struct sock *sk) 1151 { 1152 struct inet_sock *inet = inet_sk(sk); 1153 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); 1154 __be32 daddr; 1155 struct ip_options_rcu *inet_opt; 1156 struct flowi4 *fl4; 1157 int err; 1158 1159 /* Route is OK, nothing to do. */ 1160 if (rt) 1161 return 0; 1162 1163 /* Reroute. */ 1164 rcu_read_lock(); 1165 inet_opt = rcu_dereference(inet->inet_opt); 1166 daddr = inet->inet_daddr; 1167 if (inet_opt && inet_opt->opt.srr) 1168 daddr = inet_opt->opt.faddr; 1169 rcu_read_unlock(); 1170 fl4 = &inet->cork.fl.u.ip4; 1171 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr, 1172 inet->inet_dport, inet->inet_sport, 1173 sk->sk_protocol, RT_CONN_FLAGS(sk), 1174 sk->sk_bound_dev_if); 1175 if (!IS_ERR(rt)) { 1176 err = 0; 1177 sk_setup_caps(sk, &rt->dst); 1178 } else { 1179 err = PTR_ERR(rt); 1180 1181 /* Routing failed... */ 1182 sk->sk_route_caps = 0; 1183 /* 1184 * Other protocols have to map its equivalent state to TCP_SYN_SENT. 1185 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme 1186 */ 1187 if (!sysctl_ip_dynaddr || 1188 sk->sk_state != TCP_SYN_SENT || 1189 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 1190 (err = inet_sk_reselect_saddr(sk)) != 0) 1191 sk->sk_err_soft = -err; 1192 } 1193 1194 return err; 1195 } 1196 EXPORT_SYMBOL(inet_sk_rebuild_header); 1197 1198 static struct sk_buff *inet_gso_segment(struct sk_buff *skb, 1199 netdev_features_t features) 1200 { 1201 struct sk_buff *segs = ERR_PTR(-EINVAL); 1202 const struct net_offload *ops; 1203 unsigned int offset = 0; 1204 bool udpfrag, encap; 1205 struct iphdr *iph; 1206 int proto; 1207 int nhoff; 1208 int ihl; 1209 int id; 1210 1211 if (unlikely(skb_shinfo(skb)->gso_type & 1212 ~(SKB_GSO_TCPV4 | 1213 SKB_GSO_UDP | 1214 SKB_GSO_DODGY | 1215 SKB_GSO_TCP_ECN | 1216 SKB_GSO_GRE | 1217 SKB_GSO_GRE_CSUM | 1218 SKB_GSO_IPIP | 1219 SKB_GSO_SIT | 1220 SKB_GSO_TCPV6 | 1221 SKB_GSO_UDP_TUNNEL | 1222 SKB_GSO_UDP_TUNNEL_CSUM | 1223 SKB_GSO_TUNNEL_REMCSUM | 1224 0))) 1225 goto out; 1226 1227 skb_reset_network_header(skb); 1228 nhoff = skb_network_header(skb) - skb_mac_header(skb); 1229 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1230 goto out; 1231 1232 iph = ip_hdr(skb); 1233 ihl = iph->ihl * 4; 1234 if (ihl < sizeof(*iph)) 1235 goto out; 1236 1237 id = ntohs(iph->id); 1238 proto = iph->protocol; 1239 1240 /* Warning: after this point, iph might be no longer valid */ 1241 if (unlikely(!pskb_may_pull(skb, ihl))) 1242 goto out; 1243 __skb_pull(skb, ihl); 1244 1245 encap = SKB_GSO_CB(skb)->encap_level > 0; 1246 if (encap) 1247 features &= skb->dev->hw_enc_features; 1248 SKB_GSO_CB(skb)->encap_level += ihl; 1249 1250 skb_reset_transport_header(skb); 1251 1252 segs = ERR_PTR(-EPROTONOSUPPORT); 1253 1254 if (skb->encapsulation && 1255 skb_shinfo(skb)->gso_type & (SKB_GSO_SIT|SKB_GSO_IPIP)) 1256 udpfrag = proto == IPPROTO_UDP && encap; 1257 else 1258 udpfrag = proto == IPPROTO_UDP && !skb->encapsulation; 1259 1260 ops = rcu_dereference(inet_offloads[proto]); 1261 if (likely(ops && ops->callbacks.gso_segment)) 1262 segs = ops->callbacks.gso_segment(skb, features); 1263 1264 if (IS_ERR_OR_NULL(segs)) 1265 goto out; 1266 1267 skb = segs; 1268 do { 1269 iph = (struct iphdr *)(skb_mac_header(skb) + nhoff); 1270 if (udpfrag) { 1271 iph->id = htons(id); 1272 iph->frag_off = htons(offset >> 3); 1273 if (skb->next) 1274 iph->frag_off |= htons(IP_MF); 1275 offset += skb->len - nhoff - ihl; 1276 } else { 1277 iph->id = htons(id++); 1278 } 1279 iph->tot_len = htons(skb->len - nhoff); 1280 ip_send_check(iph); 1281 if (encap) 1282 skb_reset_inner_headers(skb); 1283 skb->network_header = (u8 *)iph - skb->head; 1284 } while ((skb = skb->next)); 1285 1286 out: 1287 return segs; 1288 } 1289 1290 static struct sk_buff **inet_gro_receive(struct sk_buff **head, 1291 struct sk_buff *skb) 1292 { 1293 const struct net_offload *ops; 1294 struct sk_buff **pp = NULL; 1295 struct sk_buff *p; 1296 const struct iphdr *iph; 1297 unsigned int hlen; 1298 unsigned int off; 1299 unsigned int id; 1300 int flush = 1; 1301 int proto; 1302 1303 off = skb_gro_offset(skb); 1304 hlen = off + sizeof(*iph); 1305 iph = skb_gro_header_fast(skb, off); 1306 if (skb_gro_header_hard(skb, hlen)) { 1307 iph = skb_gro_header_slow(skb, hlen, off); 1308 if (unlikely(!iph)) 1309 goto out; 1310 } 1311 1312 proto = iph->protocol; 1313 1314 rcu_read_lock(); 1315 ops = rcu_dereference(inet_offloads[proto]); 1316 if (!ops || !ops->callbacks.gro_receive) 1317 goto out_unlock; 1318 1319 if (*(u8 *)iph != 0x45) 1320 goto out_unlock; 1321 1322 if (unlikely(ip_fast_csum((u8 *)iph, 5))) 1323 goto out_unlock; 1324 1325 id = ntohl(*(__be32 *)&iph->id); 1326 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF)); 1327 id >>= 16; 1328 1329 for (p = *head; p; p = p->next) { 1330 struct iphdr *iph2; 1331 1332 if (!NAPI_GRO_CB(p)->same_flow) 1333 continue; 1334 1335 iph2 = (struct iphdr *)(p->data + off); 1336 /* The above works because, with the exception of the top 1337 * (inner most) layer, we only aggregate pkts with the same 1338 * hdr length so all the hdrs we'll need to verify will start 1339 * at the same offset. 1340 */ 1341 if ((iph->protocol ^ iph2->protocol) | 1342 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) | 1343 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) { 1344 NAPI_GRO_CB(p)->same_flow = 0; 1345 continue; 1346 } 1347 1348 /* All fields must match except length and checksum. */ 1349 NAPI_GRO_CB(p)->flush |= 1350 (iph->ttl ^ iph2->ttl) | 1351 (iph->tos ^ iph2->tos) | 1352 ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF)); 1353 1354 /* Save the IP ID check to be included later when we get to 1355 * the transport layer so only the inner most IP ID is checked. 1356 * This is because some GSO/TSO implementations do not 1357 * correctly increment the IP ID for the outer hdrs. 1358 */ 1359 NAPI_GRO_CB(p)->flush_id = 1360 ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id); 1361 NAPI_GRO_CB(p)->flush |= flush; 1362 } 1363 1364 NAPI_GRO_CB(skb)->flush |= flush; 1365 skb_set_network_header(skb, off); 1366 /* The above will be needed by the transport layer if there is one 1367 * immediately following this IP hdr. 1368 */ 1369 1370 /* Note : No need to call skb_gro_postpull_rcsum() here, 1371 * as we already checked checksum over ipv4 header was 0 1372 */ 1373 skb_gro_pull(skb, sizeof(*iph)); 1374 skb_set_transport_header(skb, skb_gro_offset(skb)); 1375 1376 pp = ops->callbacks.gro_receive(head, skb); 1377 1378 out_unlock: 1379 rcu_read_unlock(); 1380 1381 out: 1382 NAPI_GRO_CB(skb)->flush |= flush; 1383 1384 return pp; 1385 } 1386 1387 int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 1388 { 1389 if (sk->sk_family == AF_INET) 1390 return ip_recv_error(sk, msg, len, addr_len); 1391 #if IS_ENABLED(CONFIG_IPV6) 1392 if (sk->sk_family == AF_INET6) 1393 return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len); 1394 #endif 1395 return -EINVAL; 1396 } 1397 1398 static int inet_gro_complete(struct sk_buff *skb, int nhoff) 1399 { 1400 __be16 newlen = htons(skb->len - nhoff); 1401 struct iphdr *iph = (struct iphdr *)(skb->data + nhoff); 1402 const struct net_offload *ops; 1403 int proto = iph->protocol; 1404 int err = -ENOSYS; 1405 1406 if (skb->encapsulation) 1407 skb_set_inner_network_header(skb, nhoff); 1408 1409 csum_replace2(&iph->check, iph->tot_len, newlen); 1410 iph->tot_len = newlen; 1411 1412 rcu_read_lock(); 1413 ops = rcu_dereference(inet_offloads[proto]); 1414 if (WARN_ON(!ops || !ops->callbacks.gro_complete)) 1415 goto out_unlock; 1416 1417 /* Only need to add sizeof(*iph) to get to the next hdr below 1418 * because any hdr with option will have been flushed in 1419 * inet_gro_receive(). 1420 */ 1421 err = ops->callbacks.gro_complete(skb, nhoff + sizeof(*iph)); 1422 1423 out_unlock: 1424 rcu_read_unlock(); 1425 1426 return err; 1427 } 1428 1429 int inet_ctl_sock_create(struct sock **sk, unsigned short family, 1430 unsigned short type, unsigned char protocol, 1431 struct net *net) 1432 { 1433 struct socket *sock; 1434 int rc = sock_create_kern(net, family, type, protocol, &sock); 1435 1436 if (rc == 0) { 1437 *sk = sock->sk; 1438 (*sk)->sk_allocation = GFP_ATOMIC; 1439 /* 1440 * Unhash it so that IP input processing does not even see it, 1441 * we do not wish this socket to see incoming packets. 1442 */ 1443 (*sk)->sk_prot->unhash(*sk); 1444 } 1445 return rc; 1446 } 1447 EXPORT_SYMBOL_GPL(inet_ctl_sock_create); 1448 1449 u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offt) 1450 { 1451 return *(((unsigned long *)per_cpu_ptr(mib, cpu)) + offt); 1452 } 1453 EXPORT_SYMBOL_GPL(snmp_get_cpu_field); 1454 1455 unsigned long snmp_fold_field(void __percpu *mib, int offt) 1456 { 1457 unsigned long res = 0; 1458 int i; 1459 1460 for_each_possible_cpu(i) 1461 res += snmp_get_cpu_field(mib, i, offt); 1462 return res; 1463 } 1464 EXPORT_SYMBOL_GPL(snmp_fold_field); 1465 1466 #if BITS_PER_LONG==32 1467 1468 u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offt, 1469 size_t syncp_offset) 1470 { 1471 void *bhptr; 1472 struct u64_stats_sync *syncp; 1473 u64 v; 1474 unsigned int start; 1475 1476 bhptr = per_cpu_ptr(mib, cpu); 1477 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset); 1478 do { 1479 start = u64_stats_fetch_begin_irq(syncp); 1480 v = *(((u64 *)bhptr) + offt); 1481 } while (u64_stats_fetch_retry_irq(syncp, start)); 1482 1483 return v; 1484 } 1485 EXPORT_SYMBOL_GPL(snmp_get_cpu_field64); 1486 1487 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset) 1488 { 1489 u64 res = 0; 1490 int cpu; 1491 1492 for_each_possible_cpu(cpu) { 1493 res += snmp_get_cpu_field64(mib, cpu, offt, syncp_offset); 1494 } 1495 return res; 1496 } 1497 EXPORT_SYMBOL_GPL(snmp_fold_field64); 1498 #endif 1499 1500 #ifdef CONFIG_IP_MULTICAST 1501 static const struct net_protocol igmp_protocol = { 1502 .handler = igmp_rcv, 1503 .netns_ok = 1, 1504 }; 1505 #endif 1506 1507 static const struct net_protocol tcp_protocol = { 1508 .early_demux = tcp_v4_early_demux, 1509 .handler = tcp_v4_rcv, 1510 .err_handler = tcp_v4_err, 1511 .no_policy = 1, 1512 .netns_ok = 1, 1513 .icmp_strict_tag_validation = 1, 1514 }; 1515 1516 static const struct net_protocol udp_protocol = { 1517 .early_demux = udp_v4_early_demux, 1518 .handler = udp_rcv, 1519 .err_handler = udp_err, 1520 .no_policy = 1, 1521 .netns_ok = 1, 1522 }; 1523 1524 static const struct net_protocol icmp_protocol = { 1525 .handler = icmp_rcv, 1526 .err_handler = icmp_err, 1527 .no_policy = 1, 1528 .netns_ok = 1, 1529 }; 1530 1531 static __net_init int ipv4_mib_init_net(struct net *net) 1532 { 1533 int i; 1534 1535 net->mib.tcp_statistics = alloc_percpu(struct tcp_mib); 1536 if (!net->mib.tcp_statistics) 1537 goto err_tcp_mib; 1538 net->mib.ip_statistics = alloc_percpu(struct ipstats_mib); 1539 if (!net->mib.ip_statistics) 1540 goto err_ip_mib; 1541 1542 for_each_possible_cpu(i) { 1543 struct ipstats_mib *af_inet_stats; 1544 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i); 1545 u64_stats_init(&af_inet_stats->syncp); 1546 } 1547 1548 net->mib.net_statistics = alloc_percpu(struct linux_mib); 1549 if (!net->mib.net_statistics) 1550 goto err_net_mib; 1551 net->mib.udp_statistics = alloc_percpu(struct udp_mib); 1552 if (!net->mib.udp_statistics) 1553 goto err_udp_mib; 1554 net->mib.udplite_statistics = alloc_percpu(struct udp_mib); 1555 if (!net->mib.udplite_statistics) 1556 goto err_udplite_mib; 1557 net->mib.icmp_statistics = alloc_percpu(struct icmp_mib); 1558 if (!net->mib.icmp_statistics) 1559 goto err_icmp_mib; 1560 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib), 1561 GFP_KERNEL); 1562 if (!net->mib.icmpmsg_statistics) 1563 goto err_icmpmsg_mib; 1564 1565 tcp_mib_init(net); 1566 return 0; 1567 1568 err_icmpmsg_mib: 1569 free_percpu(net->mib.icmp_statistics); 1570 err_icmp_mib: 1571 free_percpu(net->mib.udplite_statistics); 1572 err_udplite_mib: 1573 free_percpu(net->mib.udp_statistics); 1574 err_udp_mib: 1575 free_percpu(net->mib.net_statistics); 1576 err_net_mib: 1577 free_percpu(net->mib.ip_statistics); 1578 err_ip_mib: 1579 free_percpu(net->mib.tcp_statistics); 1580 err_tcp_mib: 1581 return -ENOMEM; 1582 } 1583 1584 static __net_exit void ipv4_mib_exit_net(struct net *net) 1585 { 1586 kfree(net->mib.icmpmsg_statistics); 1587 free_percpu(net->mib.icmp_statistics); 1588 free_percpu(net->mib.udplite_statistics); 1589 free_percpu(net->mib.udp_statistics); 1590 free_percpu(net->mib.net_statistics); 1591 free_percpu(net->mib.ip_statistics); 1592 free_percpu(net->mib.tcp_statistics); 1593 } 1594 1595 static __net_initdata struct pernet_operations ipv4_mib_ops = { 1596 .init = ipv4_mib_init_net, 1597 .exit = ipv4_mib_exit_net, 1598 }; 1599 1600 static int __init init_ipv4_mibs(void) 1601 { 1602 return register_pernet_subsys(&ipv4_mib_ops); 1603 } 1604 1605 static __net_init int inet_init_net(struct net *net) 1606 { 1607 /* 1608 * Set defaults for local port range 1609 */ 1610 seqlock_init(&net->ipv4.ip_local_ports.lock); 1611 net->ipv4.ip_local_ports.range[0] = 32768; 1612 net->ipv4.ip_local_ports.range[1] = 60999; 1613 1614 seqlock_init(&net->ipv4.ping_group_range.lock); 1615 /* 1616 * Sane defaults - nobody may create ping sockets. 1617 * Boot scripts should set this to distro-specific group. 1618 */ 1619 net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1); 1620 net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0); 1621 return 0; 1622 } 1623 1624 static __net_exit void inet_exit_net(struct net *net) 1625 { 1626 } 1627 1628 static __net_initdata struct pernet_operations af_inet_ops = { 1629 .init = inet_init_net, 1630 .exit = inet_exit_net, 1631 }; 1632 1633 static int __init init_inet_pernet_ops(void) 1634 { 1635 return register_pernet_subsys(&af_inet_ops); 1636 } 1637 1638 static int ipv4_proc_init(void); 1639 1640 /* 1641 * IP protocol layer initialiser 1642 */ 1643 1644 static struct packet_offload ip_packet_offload __read_mostly = { 1645 .type = cpu_to_be16(ETH_P_IP), 1646 .callbacks = { 1647 .gso_segment = inet_gso_segment, 1648 .gro_receive = inet_gro_receive, 1649 .gro_complete = inet_gro_complete, 1650 }, 1651 }; 1652 1653 static const struct net_offload ipip_offload = { 1654 .callbacks = { 1655 .gso_segment = inet_gso_segment, 1656 .gro_receive = inet_gro_receive, 1657 .gro_complete = inet_gro_complete, 1658 }, 1659 }; 1660 1661 static int __init ipv4_offload_init(void) 1662 { 1663 /* 1664 * Add offloads 1665 */ 1666 if (udpv4_offload_init() < 0) 1667 pr_crit("%s: Cannot add UDP protocol offload\n", __func__); 1668 if (tcpv4_offload_init() < 0) 1669 pr_crit("%s: Cannot add TCP protocol offload\n", __func__); 1670 1671 dev_add_offload(&ip_packet_offload); 1672 inet_add_offload(&ipip_offload, IPPROTO_IPIP); 1673 return 0; 1674 } 1675 1676 fs_initcall(ipv4_offload_init); 1677 1678 static struct packet_type ip_packet_type __read_mostly = { 1679 .type = cpu_to_be16(ETH_P_IP), 1680 .func = ip_rcv, 1681 }; 1682 1683 static int __init inet_init(void) 1684 { 1685 struct inet_protosw *q; 1686 struct list_head *r; 1687 int rc = -EINVAL; 1688 1689 sock_skb_cb_check_size(sizeof(struct inet_skb_parm)); 1690 1691 rc = proto_register(&tcp_prot, 1); 1692 if (rc) 1693 goto out; 1694 1695 rc = proto_register(&udp_prot, 1); 1696 if (rc) 1697 goto out_unregister_tcp_proto; 1698 1699 rc = proto_register(&raw_prot, 1); 1700 if (rc) 1701 goto out_unregister_udp_proto; 1702 1703 rc = proto_register(&ping_prot, 1); 1704 if (rc) 1705 goto out_unregister_raw_proto; 1706 1707 /* 1708 * Tell SOCKET that we are alive... 1709 */ 1710 1711 (void)sock_register(&inet_family_ops); 1712 1713 #ifdef CONFIG_SYSCTL 1714 ip_static_sysctl_init(); 1715 #endif 1716 1717 /* 1718 * Add all the base protocols. 1719 */ 1720 1721 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 1722 pr_crit("%s: Cannot add ICMP protocol\n", __func__); 1723 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) 1724 pr_crit("%s: Cannot add UDP protocol\n", __func__); 1725 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) 1726 pr_crit("%s: Cannot add TCP protocol\n", __func__); 1727 #ifdef CONFIG_IP_MULTICAST 1728 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 1729 pr_crit("%s: Cannot add IGMP protocol\n", __func__); 1730 #endif 1731 1732 /* Register the socket-side information for inet_create. */ 1733 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 1734 INIT_LIST_HEAD(r); 1735 1736 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 1737 inet_register_protosw(q); 1738 1739 /* 1740 * Set the ARP module up 1741 */ 1742 1743 arp_init(); 1744 1745 /* 1746 * Set the IP module up 1747 */ 1748 1749 ip_init(); 1750 1751 tcp_v4_init(); 1752 1753 /* Setup TCP slab cache for open requests. */ 1754 tcp_init(); 1755 1756 /* Setup UDP memory threshold */ 1757 udp_init(); 1758 1759 /* Add UDP-Lite (RFC 3828) */ 1760 udplite4_register(); 1761 1762 ping_init(); 1763 1764 /* 1765 * Set the ICMP layer up 1766 */ 1767 1768 if (icmp_init() < 0) 1769 panic("Failed to create the ICMP control socket.\n"); 1770 1771 /* 1772 * Initialise the multicast router 1773 */ 1774 #if defined(CONFIG_IP_MROUTE) 1775 if (ip_mr_init()) 1776 pr_crit("%s: Cannot init ipv4 mroute\n", __func__); 1777 #endif 1778 1779 if (init_inet_pernet_ops()) 1780 pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__); 1781 /* 1782 * Initialise per-cpu ipv4 mibs 1783 */ 1784 1785 if (init_ipv4_mibs()) 1786 pr_crit("%s: Cannot init ipv4 mibs\n", __func__); 1787 1788 ipv4_proc_init(); 1789 1790 ipfrag_init(); 1791 1792 dev_add_pack(&ip_packet_type); 1793 1794 ip_tunnel_core_init(); 1795 1796 rc = 0; 1797 out: 1798 return rc; 1799 out_unregister_raw_proto: 1800 proto_unregister(&raw_prot); 1801 out_unregister_udp_proto: 1802 proto_unregister(&udp_prot); 1803 out_unregister_tcp_proto: 1804 proto_unregister(&tcp_prot); 1805 goto out; 1806 } 1807 1808 fs_initcall(inet_init); 1809 1810 /* ------------------------------------------------------------------------ */ 1811 1812 #ifdef CONFIG_PROC_FS 1813 static int __init ipv4_proc_init(void) 1814 { 1815 int rc = 0; 1816 1817 if (raw_proc_init()) 1818 goto out_raw; 1819 if (tcp4_proc_init()) 1820 goto out_tcp; 1821 if (udp4_proc_init()) 1822 goto out_udp; 1823 if (ping_proc_init()) 1824 goto out_ping; 1825 if (ip_misc_proc_init()) 1826 goto out_misc; 1827 out: 1828 return rc; 1829 out_misc: 1830 ping_proc_exit(); 1831 out_ping: 1832 udp4_proc_exit(); 1833 out_udp: 1834 tcp4_proc_exit(); 1835 out_tcp: 1836 raw_proc_exit(); 1837 out_raw: 1838 rc = -ENOMEM; 1839 goto out; 1840 } 1841 1842 #else /* CONFIG_PROC_FS */ 1843 static int __init ipv4_proc_init(void) 1844 { 1845 return 0; 1846 } 1847 #endif /* CONFIG_PROC_FS */ 1848 1849 MODULE_ALIAS_NETPROTO(PF_INET); 1850 1851