1 /* 2 * INET An implementation of the TCP/IP protocol suite for the LINUX 3 * operating system. INET is implemented using the BSD Socket 4 * interface as the means of communication with the user level. 5 * 6 * PF_INET protocol family socket handler. 7 * 8 * Authors: Ross Biro 9 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 10 * Florian La Roche, <flla@stud.uni-sb.de> 11 * Alan Cox, <A.Cox@swansea.ac.uk> 12 * 13 * Changes (see also sock.c) 14 * 15 * piggy, 16 * Karl Knutson : Socket protocol table 17 * A.N.Kuznetsov : Socket death error in accept(). 18 * John Richardson : Fix non blocking error in connect() 19 * so sockets that fail to connect 20 * don't return -EINPROGRESS. 21 * Alan Cox : Asynchronous I/O support 22 * Alan Cox : Keep correct socket pointer on sock 23 * structures 24 * when accept() ed 25 * Alan Cox : Semantics of SO_LINGER aren't state 26 * moved to close when you look carefully. 27 * With this fixed and the accept bug fixed 28 * some RPC stuff seems happier. 29 * Niibe Yutaka : 4.4BSD style write async I/O 30 * Alan Cox, 31 * Tony Gale : Fixed reuse semantics. 32 * Alan Cox : bind() shouldn't abort existing but dead 33 * sockets. Stops FTP netin:.. I hope. 34 * Alan Cox : bind() works correctly for RAW sockets. 35 * Note that FreeBSD at least was broken 36 * in this respect so be careful with 37 * compatibility tests... 38 * Alan Cox : routing cache support 39 * Alan Cox : memzero the socket structure for 40 * compactness. 41 * Matt Day : nonblock connect error handler 42 * Alan Cox : Allow large numbers of pending sockets 43 * (eg for big web sites), but only if 44 * specifically application requested. 45 * Alan Cox : New buffering throughout IP. Used 46 * dumbly. 47 * Alan Cox : New buffering now used smartly. 48 * Alan Cox : BSD rather than common sense 49 * interpretation of listen. 50 * Germano Caronni : Assorted small races. 51 * Alan Cox : sendmsg/recvmsg basic support. 52 * Alan Cox : Only sendmsg/recvmsg now supported. 53 * Alan Cox : Locked down bind (see security list). 54 * Alan Cox : Loosened bind a little. 55 * Mike McLagan : ADD/DEL DLCI Ioctls 56 * Willy Konynenberg : Transparent proxying support. 57 * David S. Miller : New socket lookup architecture. 58 * Some other random speedups. 59 * Cyrus Durgin : Cleaned up file for kmod hacks. 60 * Andi Kleen : Fix inet_stream_connect TCP race. 61 * 62 * This program is free software; you can redistribute it and/or 63 * modify it under the terms of the GNU General Public License 64 * as published by the Free Software Foundation; either version 65 * 2 of the License, or (at your option) any later version. 66 */ 67 68 #define pr_fmt(fmt) "IPv4: " fmt 69 70 #include <linux/err.h> 71 #include <linux/errno.h> 72 #include <linux/types.h> 73 #include <linux/socket.h> 74 #include <linux/in.h> 75 #include <linux/kernel.h> 76 #include <linux/module.h> 77 #include <linux/sched.h> 78 #include <linux/timer.h> 79 #include <linux/string.h> 80 #include <linux/sockios.h> 81 #include <linux/net.h> 82 #include <linux/capability.h> 83 #include <linux/fcntl.h> 84 #include <linux/mm.h> 85 #include <linux/interrupt.h> 86 #include <linux/stat.h> 87 #include <linux/init.h> 88 #include <linux/poll.h> 89 #include <linux/netfilter_ipv4.h> 90 #include <linux/random.h> 91 #include <linux/slab.h> 92 93 #include <asm/uaccess.h> 94 95 #include <linux/inet.h> 96 #include <linux/igmp.h> 97 #include <linux/inetdevice.h> 98 #include <linux/netdevice.h> 99 #include <net/checksum.h> 100 #include <net/ip.h> 101 #include <net/protocol.h> 102 #include <net/arp.h> 103 #include <net/route.h> 104 #include <net/ip_fib.h> 105 #include <net/inet_connection_sock.h> 106 #include <net/tcp.h> 107 #include <net/udp.h> 108 #include <net/udplite.h> 109 #include <net/ping.h> 110 #include <linux/skbuff.h> 111 #include <net/sock.h> 112 #include <net/raw.h> 113 #include <net/icmp.h> 114 #include <net/inet_common.h> 115 #include <net/ip_tunnels.h> 116 #include <net/xfrm.h> 117 #include <net/net_namespace.h> 118 #include <net/secure_seq.h> 119 #ifdef CONFIG_IP_MROUTE 120 #include <linux/mroute.h> 121 #endif 122 #include <net/l3mdev.h> 123 124 125 /* The inetsw table contains everything that inet_create needs to 126 * build a new socket. 127 */ 128 static struct list_head inetsw[SOCK_MAX]; 129 static DEFINE_SPINLOCK(inetsw_lock); 130 131 /* New destruction routine */ 132 133 void inet_sock_destruct(struct sock *sk) 134 { 135 struct inet_sock *inet = inet_sk(sk); 136 137 __skb_queue_purge(&sk->sk_receive_queue); 138 __skb_queue_purge(&sk->sk_error_queue); 139 140 sk_mem_reclaim(sk); 141 142 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) { 143 pr_err("Attempt to release TCP socket in state %d %p\n", 144 sk->sk_state, sk); 145 return; 146 } 147 if (!sock_flag(sk, SOCK_DEAD)) { 148 pr_err("Attempt to release alive inet socket %p\n", sk); 149 return; 150 } 151 152 WARN_ON(atomic_read(&sk->sk_rmem_alloc)); 153 WARN_ON(atomic_read(&sk->sk_wmem_alloc)); 154 WARN_ON(sk->sk_wmem_queued); 155 WARN_ON(sk->sk_forward_alloc); 156 157 kfree(rcu_dereference_protected(inet->inet_opt, 1)); 158 dst_release(rcu_dereference_check(sk->sk_dst_cache, 1)); 159 dst_release(sk->sk_rx_dst); 160 sk_refcnt_debug_dec(sk); 161 } 162 EXPORT_SYMBOL(inet_sock_destruct); 163 164 /* 165 * The routines beyond this point handle the behaviour of an AF_INET 166 * socket object. Mostly it punts to the subprotocols of IP to do 167 * the work. 168 */ 169 170 /* 171 * Automatically bind an unbound socket. 172 */ 173 174 static int inet_autobind(struct sock *sk) 175 { 176 struct inet_sock *inet; 177 /* We may need to bind the socket. */ 178 lock_sock(sk); 179 inet = inet_sk(sk); 180 if (!inet->inet_num) { 181 if (sk->sk_prot->get_port(sk, 0)) { 182 release_sock(sk); 183 return -EAGAIN; 184 } 185 inet->inet_sport = htons(inet->inet_num); 186 } 187 release_sock(sk); 188 return 0; 189 } 190 191 /* 192 * Move a socket into listening state. 193 */ 194 int inet_listen(struct socket *sock, int backlog) 195 { 196 struct sock *sk = sock->sk; 197 unsigned char old_state; 198 int err; 199 200 lock_sock(sk); 201 202 err = -EINVAL; 203 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM) 204 goto out; 205 206 old_state = sk->sk_state; 207 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN))) 208 goto out; 209 210 /* Really, if the socket is already in listen state 211 * we can only allow the backlog to be adjusted. 212 */ 213 if (old_state != TCP_LISTEN) { 214 /* Check special setups for testing purpose to enable TFO w/o 215 * requiring TCP_FASTOPEN sockopt. 216 * Note that only TCP sockets (SOCK_STREAM) will reach here. 217 * Also fastopenq may already been allocated because this 218 * socket was in TCP_LISTEN state previously but was 219 * shutdown() (rather than close()). 220 */ 221 if ((sysctl_tcp_fastopen & TFO_SERVER_ENABLE) != 0 && 222 !inet_csk(sk)->icsk_accept_queue.fastopenq.max_qlen) { 223 if ((sysctl_tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) != 0) 224 fastopen_queue_tune(sk, backlog); 225 else if ((sysctl_tcp_fastopen & 226 TFO_SERVER_WO_SOCKOPT2) != 0) 227 fastopen_queue_tune(sk, 228 ((uint)sysctl_tcp_fastopen) >> 16); 229 230 tcp_fastopen_init_key_once(true); 231 } 232 err = inet_csk_listen_start(sk, backlog); 233 if (err) 234 goto out; 235 } 236 sk->sk_max_ack_backlog = backlog; 237 err = 0; 238 239 out: 240 release_sock(sk); 241 return err; 242 } 243 EXPORT_SYMBOL(inet_listen); 244 245 /* 246 * Create an inet socket. 247 */ 248 249 static int inet_create(struct net *net, struct socket *sock, int protocol, 250 int kern) 251 { 252 struct sock *sk; 253 struct inet_protosw *answer; 254 struct inet_sock *inet; 255 struct proto *answer_prot; 256 unsigned char answer_flags; 257 int try_loading_module = 0; 258 int err; 259 260 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 sk->sk_prot->hash(sk); 371 } 372 373 if (sk->sk_prot->init) { 374 err = sk->sk_prot->init(sk); 375 if (err) 376 sk_common_release(sk); 377 } 378 out: 379 return err; 380 out_rcu_unlock: 381 rcu_read_unlock(); 382 goto out; 383 } 384 385 386 /* 387 * The peer socket should always be NULL (or else). When we call this 388 * function we are destroying the object and from then on nobody 389 * should refer to it. 390 */ 391 int inet_release(struct socket *sock) 392 { 393 struct sock *sk = sock->sk; 394 395 if (sk) { 396 long timeout; 397 398 /* Applications forget to leave groups before exiting */ 399 ip_mc_drop_socket(sk); 400 401 /* If linger is set, we don't return until the close 402 * is complete. Otherwise we return immediately. The 403 * actually closing is done the same either way. 404 * 405 * If the close is due to the process exiting, we never 406 * linger.. 407 */ 408 timeout = 0; 409 if (sock_flag(sk, SOCK_LINGER) && 410 !(current->flags & PF_EXITING)) 411 timeout = sk->sk_lingertime; 412 sock->sk = NULL; 413 sk->sk_prot->close(sk, timeout); 414 } 415 return 0; 416 } 417 EXPORT_SYMBOL(inet_release); 418 419 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 420 { 421 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 422 struct sock *sk = sock->sk; 423 struct inet_sock *inet = inet_sk(sk); 424 struct net *net = sock_net(sk); 425 unsigned short snum; 426 int chk_addr_ret; 427 u32 tb_id = RT_TABLE_LOCAL; 428 int err; 429 430 /* If the socket has its own bind function then use it. (RAW) */ 431 if (sk->sk_prot->bind) { 432 err = sk->sk_prot->bind(sk, uaddr, addr_len); 433 goto out; 434 } 435 err = -EINVAL; 436 if (addr_len < sizeof(struct sockaddr_in)) 437 goto out; 438 439 if (addr->sin_family != AF_INET) { 440 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET) 441 * only if s_addr is INADDR_ANY. 442 */ 443 err = -EAFNOSUPPORT; 444 if (addr->sin_family != AF_UNSPEC || 445 addr->sin_addr.s_addr != htonl(INADDR_ANY)) 446 goto out; 447 } 448 449 tb_id = l3mdev_fib_table_by_index(net, sk->sk_bound_dev_if) ? : tb_id; 450 chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id); 451 452 /* Not specified by any standard per-se, however it breaks too 453 * many applications when removed. It is unfortunate since 454 * allowing applications to make a non-local bind solves 455 * several problems with systems using dynamic addressing. 456 * (ie. your servers still start up even if your ISDN link 457 * is temporarily down) 458 */ 459 err = -EADDRNOTAVAIL; 460 if (!net->ipv4.sysctl_ip_nonlocal_bind && 461 !(inet->freebind || inet->transparent) && 462 addr->sin_addr.s_addr != htonl(INADDR_ANY) && 463 chk_addr_ret != RTN_LOCAL && 464 chk_addr_ret != RTN_MULTICAST && 465 chk_addr_ret != RTN_BROADCAST) 466 goto out; 467 468 snum = ntohs(addr->sin_port); 469 err = -EACCES; 470 if (snum && snum < PROT_SOCK && 471 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 472 goto out; 473 474 /* We keep a pair of addresses. rcv_saddr is the one 475 * used by hash lookups, and saddr is used for transmit. 476 * 477 * In the BSD API these are the same except where it 478 * would be illegal to use them (multicast/broadcast) in 479 * which case the sending device address is used. 480 */ 481 lock_sock(sk); 482 483 /* Check these errors (active socket, double bind). */ 484 err = -EINVAL; 485 if (sk->sk_state != TCP_CLOSE || inet->inet_num) 486 goto out_release_sock; 487 488 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 489 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 490 inet->inet_saddr = 0; /* Use device */ 491 492 /* Make sure we are allowed to bind here. */ 493 if ((snum || !inet->bind_address_no_port) && 494 sk->sk_prot->get_port(sk, snum)) { 495 inet->inet_saddr = inet->inet_rcv_saddr = 0; 496 err = -EADDRINUSE; 497 goto out_release_sock; 498 } 499 500 if (inet->inet_rcv_saddr) 501 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 502 if (snum) 503 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 504 inet->inet_sport = htons(inet->inet_num); 505 inet->inet_daddr = 0; 506 inet->inet_dport = 0; 507 sk_dst_reset(sk); 508 err = 0; 509 out_release_sock: 510 release_sock(sk); 511 out: 512 return err; 513 } 514 EXPORT_SYMBOL(inet_bind); 515 516 int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr, 517 int addr_len, int flags) 518 { 519 struct sock *sk = sock->sk; 520 521 if (addr_len < sizeof(uaddr->sa_family)) 522 return -EINVAL; 523 if (uaddr->sa_family == AF_UNSPEC) 524 return sk->sk_prot->disconnect(sk, flags); 525 526 if (!inet_sk(sk)->inet_num && inet_autobind(sk)) 527 return -EAGAIN; 528 return sk->sk_prot->connect(sk, uaddr, addr_len); 529 } 530 EXPORT_SYMBOL(inet_dgram_connect); 531 532 static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias) 533 { 534 DEFINE_WAIT(wait); 535 536 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 537 sk->sk_write_pending += writebias; 538 539 /* Basic assumption: if someone sets sk->sk_err, he _must_ 540 * change state of the socket from TCP_SYN_*. 541 * Connect() does not allow to get error notifications 542 * without closing the socket. 543 */ 544 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 545 release_sock(sk); 546 timeo = schedule_timeout(timeo); 547 lock_sock(sk); 548 if (signal_pending(current) || !timeo) 549 break; 550 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 551 } 552 finish_wait(sk_sleep(sk), &wait); 553 sk->sk_write_pending -= writebias; 554 return timeo; 555 } 556 557 /* 558 * Connect to a remote host. There is regrettably still a little 559 * TCP 'magic' in here. 560 */ 561 int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 562 int addr_len, int flags) 563 { 564 struct sock *sk = sock->sk; 565 int err; 566 long timeo; 567 568 if (addr_len < sizeof(uaddr->sa_family)) 569 return -EINVAL; 570 571 if (uaddr->sa_family == AF_UNSPEC) { 572 err = sk->sk_prot->disconnect(sk, flags); 573 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 574 goto out; 575 } 576 577 switch (sock->state) { 578 default: 579 err = -EINVAL; 580 goto out; 581 case SS_CONNECTED: 582 err = -EISCONN; 583 goto out; 584 case SS_CONNECTING: 585 err = -EALREADY; 586 /* Fall out of switch with err, set for this state */ 587 break; 588 case SS_UNCONNECTED: 589 err = -EISCONN; 590 if (sk->sk_state != TCP_CLOSE) 591 goto out; 592 593 err = sk->sk_prot->connect(sk, uaddr, addr_len); 594 if (err < 0) 595 goto out; 596 597 sock->state = SS_CONNECTING; 598 599 /* Just entered SS_CONNECTING state; the only 600 * difference is that return value in non-blocking 601 * case is EINPROGRESS, rather than EALREADY. 602 */ 603 err = -EINPROGRESS; 604 break; 605 } 606 607 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 608 609 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 610 int writebias = (sk->sk_protocol == IPPROTO_TCP) && 611 tcp_sk(sk)->fastopen_req && 612 tcp_sk(sk)->fastopen_req->data ? 1 : 0; 613 614 /* Error code is set above */ 615 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias)) 616 goto out; 617 618 err = sock_intr_errno(timeo); 619 if (signal_pending(current)) 620 goto out; 621 } 622 623 /* Connection was closed by RST, timeout, ICMP error 624 * or another process disconnected us. 625 */ 626 if (sk->sk_state == TCP_CLOSE) 627 goto sock_error; 628 629 /* sk->sk_err may be not zero now, if RECVERR was ordered by user 630 * and error was received after socket entered established state. 631 * Hence, it is handled normally after connect() return successfully. 632 */ 633 634 sock->state = SS_CONNECTED; 635 err = 0; 636 out: 637 return err; 638 639 sock_error: 640 err = sock_error(sk) ? : -ECONNABORTED; 641 sock->state = SS_UNCONNECTED; 642 if (sk->sk_prot->disconnect(sk, flags)) 643 sock->state = SS_DISCONNECTING; 644 goto out; 645 } 646 EXPORT_SYMBOL(__inet_stream_connect); 647 648 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 649 int addr_len, int flags) 650 { 651 int err; 652 653 lock_sock(sock->sk); 654 err = __inet_stream_connect(sock, uaddr, addr_len, flags); 655 release_sock(sock->sk); 656 return err; 657 } 658 EXPORT_SYMBOL(inet_stream_connect); 659 660 /* 661 * Accept a pending connection. The TCP layer now gives BSD semantics. 662 */ 663 664 int inet_accept(struct socket *sock, struct socket *newsock, int flags) 665 { 666 struct sock *sk1 = sock->sk; 667 int err = -EINVAL; 668 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err); 669 670 if (!sk2) 671 goto do_err; 672 673 lock_sock(sk2); 674 675 sock_rps_record_flow(sk2); 676 WARN_ON(!((1 << sk2->sk_state) & 677 (TCPF_ESTABLISHED | TCPF_SYN_RECV | 678 TCPF_CLOSE_WAIT | TCPF_CLOSE))); 679 680 sock_graft(sk2, newsock); 681 682 newsock->state = SS_CONNECTED; 683 err = 0; 684 release_sock(sk2); 685 do_err: 686 return err; 687 } 688 EXPORT_SYMBOL(inet_accept); 689 690 691 /* 692 * This does both peername and sockname. 693 */ 694 int inet_getname(struct socket *sock, struct sockaddr *uaddr, 695 int *uaddr_len, int peer) 696 { 697 struct sock *sk = sock->sk; 698 struct inet_sock *inet = inet_sk(sk); 699 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr); 700 701 sin->sin_family = AF_INET; 702 if (peer) { 703 if (!inet->inet_dport || 704 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 705 peer == 1)) 706 return -ENOTCONN; 707 sin->sin_port = inet->inet_dport; 708 sin->sin_addr.s_addr = inet->inet_daddr; 709 } else { 710 __be32 addr = inet->inet_rcv_saddr; 711 if (!addr) 712 addr = inet->inet_saddr; 713 sin->sin_port = inet->inet_sport; 714 sin->sin_addr.s_addr = addr; 715 } 716 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 717 *uaddr_len = sizeof(*sin); 718 return 0; 719 } 720 EXPORT_SYMBOL(inet_getname); 721 722 int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) 723 { 724 struct sock *sk = sock->sk; 725 726 sock_rps_record_flow(sk); 727 728 /* We may need to bind the socket. */ 729 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 730 inet_autobind(sk)) 731 return -EAGAIN; 732 733 return sk->sk_prot->sendmsg(sk, msg, size); 734 } 735 EXPORT_SYMBOL(inet_sendmsg); 736 737 ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, 738 size_t size, int flags) 739 { 740 struct sock *sk = sock->sk; 741 742 sock_rps_record_flow(sk); 743 744 /* We may need to bind the socket. */ 745 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 746 inet_autobind(sk)) 747 return -EAGAIN; 748 749 if (sk->sk_prot->sendpage) 750 return sk->sk_prot->sendpage(sk, page, offset, size, flags); 751 return sock_no_sendpage(sock, page, offset, size, flags); 752 } 753 EXPORT_SYMBOL(inet_sendpage); 754 755 int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 756 int flags) 757 { 758 struct sock *sk = sock->sk; 759 int addr_len = 0; 760 int err; 761 762 sock_rps_record_flow(sk); 763 764 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT, 765 flags & ~MSG_DONTWAIT, &addr_len); 766 if (err >= 0) 767 msg->msg_namelen = addr_len; 768 return err; 769 } 770 EXPORT_SYMBOL(inet_recvmsg); 771 772 int inet_shutdown(struct socket *sock, int how) 773 { 774 struct sock *sk = sock->sk; 775 int err = 0; 776 777 /* This should really check to make sure 778 * the socket is a TCP socket. (WHY AC...) 779 */ 780 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and 781 1->2 bit 2 snds. 782 2->3 */ 783 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ 784 return -EINVAL; 785 786 lock_sock(sk); 787 if (sock->state == SS_CONNECTING) { 788 if ((1 << sk->sk_state) & 789 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) 790 sock->state = SS_DISCONNECTING; 791 else 792 sock->state = SS_CONNECTED; 793 } 794 795 switch (sk->sk_state) { 796 case TCP_CLOSE: 797 err = -ENOTCONN; 798 /* Hack to wake up other listeners, who can poll for 799 POLLHUP, even on eg. unconnected UDP sockets -- RR */ 800 default: 801 sk->sk_shutdown |= how; 802 if (sk->sk_prot->shutdown) 803 sk->sk_prot->shutdown(sk, how); 804 break; 805 806 /* Remaining two branches are temporary solution for missing 807 * close() in multithreaded environment. It is _not_ a good idea, 808 * but we have no choice until close() is repaired at VFS level. 809 */ 810 case TCP_LISTEN: 811 if (!(how & RCV_SHUTDOWN)) 812 break; 813 /* Fall through */ 814 case TCP_SYN_SENT: 815 err = sk->sk_prot->disconnect(sk, O_NONBLOCK); 816 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 817 break; 818 } 819 820 /* Wake up anyone sleeping in poll. */ 821 sk->sk_state_change(sk); 822 release_sock(sk); 823 return err; 824 } 825 EXPORT_SYMBOL(inet_shutdown); 826 827 /* 828 * ioctl() calls you can issue on an INET socket. Most of these are 829 * device configuration and stuff and very rarely used. Some ioctls 830 * pass on to the socket itself. 831 * 832 * NOTE: I like the idea of a module for the config stuff. ie ifconfig 833 * loads the devconfigure module does its configuring and unloads it. 834 * There's a good 20K of config code hanging around the kernel. 835 */ 836 837 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 838 { 839 struct sock *sk = sock->sk; 840 int err = 0; 841 struct net *net = sock_net(sk); 842 843 switch (cmd) { 844 case SIOCGSTAMP: 845 err = sock_get_timestamp(sk, (struct timeval __user *)arg); 846 break; 847 case SIOCGSTAMPNS: 848 err = sock_get_timestampns(sk, (struct timespec __user *)arg); 849 break; 850 case SIOCADDRT: 851 case SIOCDELRT: 852 case SIOCRTMSG: 853 err = ip_rt_ioctl(net, cmd, (void __user *)arg); 854 break; 855 case SIOCDARP: 856 case SIOCGARP: 857 case SIOCSARP: 858 err = arp_ioctl(net, cmd, (void __user *)arg); 859 break; 860 case SIOCGIFADDR: 861 case SIOCSIFADDR: 862 case SIOCGIFBRDADDR: 863 case SIOCSIFBRDADDR: 864 case SIOCGIFNETMASK: 865 case SIOCSIFNETMASK: 866 case SIOCGIFDSTADDR: 867 case SIOCSIFDSTADDR: 868 case SIOCSIFPFLAGS: 869 case SIOCGIFPFLAGS: 870 case SIOCSIFFLAGS: 871 err = devinet_ioctl(net, cmd, (void __user *)arg); 872 break; 873 default: 874 if (sk->sk_prot->ioctl) 875 err = sk->sk_prot->ioctl(sk, cmd, arg); 876 else 877 err = -ENOIOCTLCMD; 878 break; 879 } 880 return err; 881 } 882 EXPORT_SYMBOL(inet_ioctl); 883 884 #ifdef CONFIG_COMPAT 885 static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 886 { 887 struct sock *sk = sock->sk; 888 int err = -ENOIOCTLCMD; 889 890 if (sk->sk_prot->compat_ioctl) 891 err = sk->sk_prot->compat_ioctl(sk, cmd, arg); 892 893 return err; 894 } 895 #endif 896 897 const struct proto_ops inet_stream_ops = { 898 .family = PF_INET, 899 .owner = THIS_MODULE, 900 .release = inet_release, 901 .bind = inet_bind, 902 .connect = inet_stream_connect, 903 .socketpair = sock_no_socketpair, 904 .accept = inet_accept, 905 .getname = inet_getname, 906 .poll = tcp_poll, 907 .ioctl = inet_ioctl, 908 .listen = inet_listen, 909 .shutdown = inet_shutdown, 910 .setsockopt = sock_common_setsockopt, 911 .getsockopt = sock_common_getsockopt, 912 .sendmsg = inet_sendmsg, 913 .recvmsg = inet_recvmsg, 914 .mmap = sock_no_mmap, 915 .sendpage = inet_sendpage, 916 .splice_read = tcp_splice_read, 917 #ifdef CONFIG_COMPAT 918 .compat_setsockopt = compat_sock_common_setsockopt, 919 .compat_getsockopt = compat_sock_common_getsockopt, 920 .compat_ioctl = inet_compat_ioctl, 921 #endif 922 }; 923 EXPORT_SYMBOL(inet_stream_ops); 924 925 const struct proto_ops inet_dgram_ops = { 926 .family = PF_INET, 927 .owner = THIS_MODULE, 928 .release = inet_release, 929 .bind = inet_bind, 930 .connect = inet_dgram_connect, 931 .socketpair = sock_no_socketpair, 932 .accept = sock_no_accept, 933 .getname = inet_getname, 934 .poll = udp_poll, 935 .ioctl = inet_ioctl, 936 .listen = sock_no_listen, 937 .shutdown = inet_shutdown, 938 .setsockopt = sock_common_setsockopt, 939 .getsockopt = sock_common_getsockopt, 940 .sendmsg = inet_sendmsg, 941 .recvmsg = inet_recvmsg, 942 .mmap = sock_no_mmap, 943 .sendpage = inet_sendpage, 944 #ifdef CONFIG_COMPAT 945 .compat_setsockopt = compat_sock_common_setsockopt, 946 .compat_getsockopt = compat_sock_common_getsockopt, 947 .compat_ioctl = inet_compat_ioctl, 948 #endif 949 }; 950 EXPORT_SYMBOL(inet_dgram_ops); 951 952 /* 953 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 954 * udp_poll 955 */ 956 static const struct proto_ops inet_sockraw_ops = { 957 .family = PF_INET, 958 .owner = THIS_MODULE, 959 .release = inet_release, 960 .bind = inet_bind, 961 .connect = inet_dgram_connect, 962 .socketpair = sock_no_socketpair, 963 .accept = sock_no_accept, 964 .getname = inet_getname, 965 .poll = datagram_poll, 966 .ioctl = inet_ioctl, 967 .listen = sock_no_listen, 968 .shutdown = inet_shutdown, 969 .setsockopt = sock_common_setsockopt, 970 .getsockopt = sock_common_getsockopt, 971 .sendmsg = inet_sendmsg, 972 .recvmsg = inet_recvmsg, 973 .mmap = sock_no_mmap, 974 .sendpage = inet_sendpage, 975 #ifdef CONFIG_COMPAT 976 .compat_setsockopt = compat_sock_common_setsockopt, 977 .compat_getsockopt = compat_sock_common_getsockopt, 978 .compat_ioctl = inet_compat_ioctl, 979 #endif 980 }; 981 982 static const struct net_proto_family inet_family_ops = { 983 .family = PF_INET, 984 .create = inet_create, 985 .owner = THIS_MODULE, 986 }; 987 988 /* Upon startup we insert all the elements in inetsw_array[] into 989 * the linked list inetsw. 990 */ 991 static struct inet_protosw inetsw_array[] = 992 { 993 { 994 .type = SOCK_STREAM, 995 .protocol = IPPROTO_TCP, 996 .prot = &tcp_prot, 997 .ops = &inet_stream_ops, 998 .flags = INET_PROTOSW_PERMANENT | 999 INET_PROTOSW_ICSK, 1000 }, 1001 1002 { 1003 .type = SOCK_DGRAM, 1004 .protocol = IPPROTO_UDP, 1005 .prot = &udp_prot, 1006 .ops = &inet_dgram_ops, 1007 .flags = INET_PROTOSW_PERMANENT, 1008 }, 1009 1010 { 1011 .type = SOCK_DGRAM, 1012 .protocol = IPPROTO_ICMP, 1013 .prot = &ping_prot, 1014 .ops = &inet_dgram_ops, 1015 .flags = INET_PROTOSW_REUSE, 1016 }, 1017 1018 { 1019 .type = SOCK_RAW, 1020 .protocol = IPPROTO_IP, /* wild card */ 1021 .prot = &raw_prot, 1022 .ops = &inet_sockraw_ops, 1023 .flags = INET_PROTOSW_REUSE, 1024 } 1025 }; 1026 1027 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) 1028 1029 void inet_register_protosw(struct inet_protosw *p) 1030 { 1031 struct list_head *lh; 1032 struct inet_protosw *answer; 1033 int protocol = p->protocol; 1034 struct list_head *last_perm; 1035 1036 spin_lock_bh(&inetsw_lock); 1037 1038 if (p->type >= SOCK_MAX) 1039 goto out_illegal; 1040 1041 /* If we are trying to override a permanent protocol, bail. */ 1042 last_perm = &inetsw[p->type]; 1043 list_for_each(lh, &inetsw[p->type]) { 1044 answer = list_entry(lh, struct inet_protosw, list); 1045 /* Check only the non-wild match. */ 1046 if ((INET_PROTOSW_PERMANENT & answer->flags) == 0) 1047 break; 1048 if (protocol == answer->protocol) 1049 goto out_permanent; 1050 last_perm = lh; 1051 } 1052 1053 /* Add the new entry after the last permanent entry if any, so that 1054 * the new entry does not override a permanent entry when matched with 1055 * a wild-card protocol. But it is allowed to override any existing 1056 * non-permanent entry. This means that when we remove this entry, the 1057 * system automatically returns to the old behavior. 1058 */ 1059 list_add_rcu(&p->list, last_perm); 1060 out: 1061 spin_unlock_bh(&inetsw_lock); 1062 1063 return; 1064 1065 out_permanent: 1066 pr_err("Attempt to override permanent protocol %d\n", protocol); 1067 goto out; 1068 1069 out_illegal: 1070 pr_err("Ignoring attempt to register invalid socket type %d\n", 1071 p->type); 1072 goto out; 1073 } 1074 EXPORT_SYMBOL(inet_register_protosw); 1075 1076 void inet_unregister_protosw(struct inet_protosw *p) 1077 { 1078 if (INET_PROTOSW_PERMANENT & p->flags) { 1079 pr_err("Attempt to unregister permanent protocol %d\n", 1080 p->protocol); 1081 } else { 1082 spin_lock_bh(&inetsw_lock); 1083 list_del_rcu(&p->list); 1084 spin_unlock_bh(&inetsw_lock); 1085 1086 synchronize_net(); 1087 } 1088 } 1089 EXPORT_SYMBOL(inet_unregister_protosw); 1090 1091 /* 1092 * Shall we try to damage output packets if routing dev changes? 1093 */ 1094 1095 int sysctl_ip_dynaddr __read_mostly; 1096 1097 static int inet_sk_reselect_saddr(struct sock *sk) 1098 { 1099 struct inet_sock *inet = inet_sk(sk); 1100 __be32 old_saddr = inet->inet_saddr; 1101 __be32 daddr = inet->inet_daddr; 1102 struct flowi4 *fl4; 1103 struct rtable *rt; 1104 __be32 new_saddr; 1105 struct ip_options_rcu *inet_opt; 1106 1107 inet_opt = rcu_dereference_protected(inet->inet_opt, 1108 sock_owned_by_user(sk)); 1109 if (inet_opt && inet_opt->opt.srr) 1110 daddr = inet_opt->opt.faddr; 1111 1112 /* Query new route. */ 1113 fl4 = &inet->cork.fl.u.ip4; 1114 rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk), 1115 sk->sk_bound_dev_if, sk->sk_protocol, 1116 inet->inet_sport, inet->inet_dport, sk); 1117 if (IS_ERR(rt)) 1118 return PTR_ERR(rt); 1119 1120 sk_setup_caps(sk, &rt->dst); 1121 1122 new_saddr = fl4->saddr; 1123 1124 if (new_saddr == old_saddr) 1125 return 0; 1126 1127 if (sysctl_ip_dynaddr > 1) { 1128 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n", 1129 __func__, &old_saddr, &new_saddr); 1130 } 1131 1132 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr; 1133 1134 /* 1135 * XXX The only one ugly spot where we need to 1136 * XXX really change the sockets identity after 1137 * XXX it has entered the hashes. -DaveM 1138 * 1139 * Besides that, it does not check for connection 1140 * uniqueness. Wait for troubles. 1141 */ 1142 __sk_prot_rehash(sk); 1143 return 0; 1144 } 1145 1146 int inet_sk_rebuild_header(struct sock *sk) 1147 { 1148 struct inet_sock *inet = inet_sk(sk); 1149 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); 1150 __be32 daddr; 1151 struct ip_options_rcu *inet_opt; 1152 struct flowi4 *fl4; 1153 int err; 1154 1155 /* Route is OK, nothing to do. */ 1156 if (rt) 1157 return 0; 1158 1159 /* Reroute. */ 1160 rcu_read_lock(); 1161 inet_opt = rcu_dereference(inet->inet_opt); 1162 daddr = inet->inet_daddr; 1163 if (inet_opt && inet_opt->opt.srr) 1164 daddr = inet_opt->opt.faddr; 1165 rcu_read_unlock(); 1166 fl4 = &inet->cork.fl.u.ip4; 1167 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr, 1168 inet->inet_dport, inet->inet_sport, 1169 sk->sk_protocol, RT_CONN_FLAGS(sk), 1170 sk->sk_bound_dev_if); 1171 if (!IS_ERR(rt)) { 1172 err = 0; 1173 sk_setup_caps(sk, &rt->dst); 1174 } else { 1175 err = PTR_ERR(rt); 1176 1177 /* Routing failed... */ 1178 sk->sk_route_caps = 0; 1179 /* 1180 * Other protocols have to map its equivalent state to TCP_SYN_SENT. 1181 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme 1182 */ 1183 if (!sysctl_ip_dynaddr || 1184 sk->sk_state != TCP_SYN_SENT || 1185 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 1186 (err = inet_sk_reselect_saddr(sk)) != 0) 1187 sk->sk_err_soft = -err; 1188 } 1189 1190 return err; 1191 } 1192 EXPORT_SYMBOL(inet_sk_rebuild_header); 1193 1194 static struct sk_buff *inet_gso_segment(struct sk_buff *skb, 1195 netdev_features_t features) 1196 { 1197 struct sk_buff *segs = ERR_PTR(-EINVAL); 1198 const struct net_offload *ops; 1199 unsigned int offset = 0; 1200 bool udpfrag, encap; 1201 struct iphdr *iph; 1202 int proto; 1203 int nhoff; 1204 int ihl; 1205 int id; 1206 1207 if (unlikely(skb_shinfo(skb)->gso_type & 1208 ~(SKB_GSO_TCPV4 | 1209 SKB_GSO_UDP | 1210 SKB_GSO_DODGY | 1211 SKB_GSO_TCP_ECN | 1212 SKB_GSO_GRE | 1213 SKB_GSO_GRE_CSUM | 1214 SKB_GSO_IPIP | 1215 SKB_GSO_SIT | 1216 SKB_GSO_TCPV6 | 1217 SKB_GSO_UDP_TUNNEL | 1218 SKB_GSO_UDP_TUNNEL_CSUM | 1219 SKB_GSO_TUNNEL_REMCSUM | 1220 0))) 1221 goto out; 1222 1223 skb_reset_network_header(skb); 1224 nhoff = skb_network_header(skb) - skb_mac_header(skb); 1225 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1226 goto out; 1227 1228 iph = ip_hdr(skb); 1229 ihl = iph->ihl * 4; 1230 if (ihl < sizeof(*iph)) 1231 goto out; 1232 1233 id = ntohs(iph->id); 1234 proto = iph->protocol; 1235 1236 /* Warning: after this point, iph might be no longer valid */ 1237 if (unlikely(!pskb_may_pull(skb, ihl))) 1238 goto out; 1239 __skb_pull(skb, ihl); 1240 1241 encap = SKB_GSO_CB(skb)->encap_level > 0; 1242 if (encap) 1243 features &= skb->dev->hw_enc_features; 1244 SKB_GSO_CB(skb)->encap_level += ihl; 1245 1246 skb_reset_transport_header(skb); 1247 1248 segs = ERR_PTR(-EPROTONOSUPPORT); 1249 1250 if (skb->encapsulation && 1251 skb_shinfo(skb)->gso_type & (SKB_GSO_SIT|SKB_GSO_IPIP)) 1252 udpfrag = proto == IPPROTO_UDP && encap; 1253 else 1254 udpfrag = proto == IPPROTO_UDP && !skb->encapsulation; 1255 1256 ops = rcu_dereference(inet_offloads[proto]); 1257 if (likely(ops && ops->callbacks.gso_segment)) 1258 segs = ops->callbacks.gso_segment(skb, features); 1259 1260 if (IS_ERR_OR_NULL(segs)) 1261 goto out; 1262 1263 skb = segs; 1264 do { 1265 iph = (struct iphdr *)(skb_mac_header(skb) + nhoff); 1266 if (udpfrag) { 1267 iph->id = htons(id); 1268 iph->frag_off = htons(offset >> 3); 1269 if (skb->next) 1270 iph->frag_off |= htons(IP_MF); 1271 offset += skb->len - nhoff - ihl; 1272 } else { 1273 iph->id = htons(id++); 1274 } 1275 iph->tot_len = htons(skb->len - nhoff); 1276 ip_send_check(iph); 1277 if (encap) 1278 skb_reset_inner_headers(skb); 1279 skb->network_header = (u8 *)iph - skb->head; 1280 } while ((skb = skb->next)); 1281 1282 out: 1283 return segs; 1284 } 1285 1286 static struct sk_buff **inet_gro_receive(struct sk_buff **head, 1287 struct sk_buff *skb) 1288 { 1289 const struct net_offload *ops; 1290 struct sk_buff **pp = NULL; 1291 struct sk_buff *p; 1292 const struct iphdr *iph; 1293 unsigned int hlen; 1294 unsigned int off; 1295 unsigned int id; 1296 int flush = 1; 1297 int proto; 1298 1299 off = skb_gro_offset(skb); 1300 hlen = off + sizeof(*iph); 1301 iph = skb_gro_header_fast(skb, off); 1302 if (skb_gro_header_hard(skb, hlen)) { 1303 iph = skb_gro_header_slow(skb, hlen, off); 1304 if (unlikely(!iph)) 1305 goto out; 1306 } 1307 1308 proto = iph->protocol; 1309 1310 rcu_read_lock(); 1311 ops = rcu_dereference(inet_offloads[proto]); 1312 if (!ops || !ops->callbacks.gro_receive) 1313 goto out_unlock; 1314 1315 if (*(u8 *)iph != 0x45) 1316 goto out_unlock; 1317 1318 if (unlikely(ip_fast_csum((u8 *)iph, 5))) 1319 goto out_unlock; 1320 1321 id = ntohl(*(__be32 *)&iph->id); 1322 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF)); 1323 id >>= 16; 1324 1325 for (p = *head; p; p = p->next) { 1326 struct iphdr *iph2; 1327 1328 if (!NAPI_GRO_CB(p)->same_flow) 1329 continue; 1330 1331 iph2 = (struct iphdr *)(p->data + off); 1332 /* The above works because, with the exception of the top 1333 * (inner most) layer, we only aggregate pkts with the same 1334 * hdr length so all the hdrs we'll need to verify will start 1335 * at the same offset. 1336 */ 1337 if ((iph->protocol ^ iph2->protocol) | 1338 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) | 1339 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) { 1340 NAPI_GRO_CB(p)->same_flow = 0; 1341 continue; 1342 } 1343 1344 /* All fields must match except length and checksum. */ 1345 NAPI_GRO_CB(p)->flush |= 1346 (iph->ttl ^ iph2->ttl) | 1347 (iph->tos ^ iph2->tos) | 1348 ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF)); 1349 1350 /* Save the IP ID check to be included later when we get to 1351 * the transport layer so only the inner most IP ID is checked. 1352 * This is because some GSO/TSO implementations do not 1353 * correctly increment the IP ID for the outer hdrs. 1354 */ 1355 NAPI_GRO_CB(p)->flush_id = 1356 ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id); 1357 NAPI_GRO_CB(p)->flush |= flush; 1358 } 1359 1360 NAPI_GRO_CB(skb)->flush |= flush; 1361 skb_set_network_header(skb, off); 1362 /* The above will be needed by the transport layer if there is one 1363 * immediately following this IP hdr. 1364 */ 1365 1366 /* Note : No need to call skb_gro_postpull_rcsum() here, 1367 * as we already checked checksum over ipv4 header was 0 1368 */ 1369 skb_gro_pull(skb, sizeof(*iph)); 1370 skb_set_transport_header(skb, skb_gro_offset(skb)); 1371 1372 pp = ops->callbacks.gro_receive(head, skb); 1373 1374 out_unlock: 1375 rcu_read_unlock(); 1376 1377 out: 1378 NAPI_GRO_CB(skb)->flush |= flush; 1379 1380 return pp; 1381 } 1382 1383 int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 1384 { 1385 if (sk->sk_family == AF_INET) 1386 return ip_recv_error(sk, msg, len, addr_len); 1387 #if IS_ENABLED(CONFIG_IPV6) 1388 if (sk->sk_family == AF_INET6) 1389 return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len); 1390 #endif 1391 return -EINVAL; 1392 } 1393 1394 static int inet_gro_complete(struct sk_buff *skb, int nhoff) 1395 { 1396 __be16 newlen = htons(skb->len - nhoff); 1397 struct iphdr *iph = (struct iphdr *)(skb->data + nhoff); 1398 const struct net_offload *ops; 1399 int proto = iph->protocol; 1400 int err = -ENOSYS; 1401 1402 if (skb->encapsulation) 1403 skb_set_inner_network_header(skb, nhoff); 1404 1405 csum_replace2(&iph->check, iph->tot_len, newlen); 1406 iph->tot_len = newlen; 1407 1408 rcu_read_lock(); 1409 ops = rcu_dereference(inet_offloads[proto]); 1410 if (WARN_ON(!ops || !ops->callbacks.gro_complete)) 1411 goto out_unlock; 1412 1413 /* Only need to add sizeof(*iph) to get to the next hdr below 1414 * because any hdr with option will have been flushed in 1415 * inet_gro_receive(). 1416 */ 1417 err = ops->callbacks.gro_complete(skb, nhoff + sizeof(*iph)); 1418 1419 out_unlock: 1420 rcu_read_unlock(); 1421 1422 return err; 1423 } 1424 1425 int inet_ctl_sock_create(struct sock **sk, unsigned short family, 1426 unsigned short type, unsigned char protocol, 1427 struct net *net) 1428 { 1429 struct socket *sock; 1430 int rc = sock_create_kern(net, family, type, protocol, &sock); 1431 1432 if (rc == 0) { 1433 *sk = sock->sk; 1434 (*sk)->sk_allocation = GFP_ATOMIC; 1435 /* 1436 * Unhash it so that IP input processing does not even see it, 1437 * we do not wish this socket to see incoming packets. 1438 */ 1439 (*sk)->sk_prot->unhash(*sk); 1440 } 1441 return rc; 1442 } 1443 EXPORT_SYMBOL_GPL(inet_ctl_sock_create); 1444 1445 u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offt) 1446 { 1447 return *(((unsigned long *)per_cpu_ptr(mib, cpu)) + offt); 1448 } 1449 EXPORT_SYMBOL_GPL(snmp_get_cpu_field); 1450 1451 unsigned long snmp_fold_field(void __percpu *mib, int offt) 1452 { 1453 unsigned long res = 0; 1454 int i; 1455 1456 for_each_possible_cpu(i) 1457 res += snmp_get_cpu_field(mib, i, offt); 1458 return res; 1459 } 1460 EXPORT_SYMBOL_GPL(snmp_fold_field); 1461 1462 #if BITS_PER_LONG==32 1463 1464 u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offt, 1465 size_t syncp_offset) 1466 { 1467 void *bhptr; 1468 struct u64_stats_sync *syncp; 1469 u64 v; 1470 unsigned int start; 1471 1472 bhptr = per_cpu_ptr(mib, cpu); 1473 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset); 1474 do { 1475 start = u64_stats_fetch_begin_irq(syncp); 1476 v = *(((u64 *)bhptr) + offt); 1477 } while (u64_stats_fetch_retry_irq(syncp, start)); 1478 1479 return v; 1480 } 1481 EXPORT_SYMBOL_GPL(snmp_get_cpu_field64); 1482 1483 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset) 1484 { 1485 u64 res = 0; 1486 int cpu; 1487 1488 for_each_possible_cpu(cpu) { 1489 res += snmp_get_cpu_field64(mib, cpu, offt, syncp_offset); 1490 } 1491 return res; 1492 } 1493 EXPORT_SYMBOL_GPL(snmp_fold_field64); 1494 #endif 1495 1496 #ifdef CONFIG_IP_MULTICAST 1497 static const struct net_protocol igmp_protocol = { 1498 .handler = igmp_rcv, 1499 .netns_ok = 1, 1500 }; 1501 #endif 1502 1503 static const struct net_protocol tcp_protocol = { 1504 .early_demux = tcp_v4_early_demux, 1505 .handler = tcp_v4_rcv, 1506 .err_handler = tcp_v4_err, 1507 .no_policy = 1, 1508 .netns_ok = 1, 1509 .icmp_strict_tag_validation = 1, 1510 }; 1511 1512 static const struct net_protocol udp_protocol = { 1513 .early_demux = udp_v4_early_demux, 1514 .handler = udp_rcv, 1515 .err_handler = udp_err, 1516 .no_policy = 1, 1517 .netns_ok = 1, 1518 }; 1519 1520 static const struct net_protocol icmp_protocol = { 1521 .handler = icmp_rcv, 1522 .err_handler = icmp_err, 1523 .no_policy = 1, 1524 .netns_ok = 1, 1525 }; 1526 1527 static __net_init int ipv4_mib_init_net(struct net *net) 1528 { 1529 int i; 1530 1531 net->mib.tcp_statistics = alloc_percpu(struct tcp_mib); 1532 if (!net->mib.tcp_statistics) 1533 goto err_tcp_mib; 1534 net->mib.ip_statistics = alloc_percpu(struct ipstats_mib); 1535 if (!net->mib.ip_statistics) 1536 goto err_ip_mib; 1537 1538 for_each_possible_cpu(i) { 1539 struct ipstats_mib *af_inet_stats; 1540 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i); 1541 u64_stats_init(&af_inet_stats->syncp); 1542 } 1543 1544 net->mib.net_statistics = alloc_percpu(struct linux_mib); 1545 if (!net->mib.net_statistics) 1546 goto err_net_mib; 1547 net->mib.udp_statistics = alloc_percpu(struct udp_mib); 1548 if (!net->mib.udp_statistics) 1549 goto err_udp_mib; 1550 net->mib.udplite_statistics = alloc_percpu(struct udp_mib); 1551 if (!net->mib.udplite_statistics) 1552 goto err_udplite_mib; 1553 net->mib.icmp_statistics = alloc_percpu(struct icmp_mib); 1554 if (!net->mib.icmp_statistics) 1555 goto err_icmp_mib; 1556 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib), 1557 GFP_KERNEL); 1558 if (!net->mib.icmpmsg_statistics) 1559 goto err_icmpmsg_mib; 1560 1561 tcp_mib_init(net); 1562 return 0; 1563 1564 err_icmpmsg_mib: 1565 free_percpu(net->mib.icmp_statistics); 1566 err_icmp_mib: 1567 free_percpu(net->mib.udplite_statistics); 1568 err_udplite_mib: 1569 free_percpu(net->mib.udp_statistics); 1570 err_udp_mib: 1571 free_percpu(net->mib.net_statistics); 1572 err_net_mib: 1573 free_percpu(net->mib.ip_statistics); 1574 err_ip_mib: 1575 free_percpu(net->mib.tcp_statistics); 1576 err_tcp_mib: 1577 return -ENOMEM; 1578 } 1579 1580 static __net_exit void ipv4_mib_exit_net(struct net *net) 1581 { 1582 kfree(net->mib.icmpmsg_statistics); 1583 free_percpu(net->mib.icmp_statistics); 1584 free_percpu(net->mib.udplite_statistics); 1585 free_percpu(net->mib.udp_statistics); 1586 free_percpu(net->mib.net_statistics); 1587 free_percpu(net->mib.ip_statistics); 1588 free_percpu(net->mib.tcp_statistics); 1589 } 1590 1591 static __net_initdata struct pernet_operations ipv4_mib_ops = { 1592 .init = ipv4_mib_init_net, 1593 .exit = ipv4_mib_exit_net, 1594 }; 1595 1596 static int __init init_ipv4_mibs(void) 1597 { 1598 return register_pernet_subsys(&ipv4_mib_ops); 1599 } 1600 1601 static __net_init int inet_init_net(struct net *net) 1602 { 1603 /* 1604 * Set defaults for local port range 1605 */ 1606 seqlock_init(&net->ipv4.ip_local_ports.lock); 1607 net->ipv4.ip_local_ports.range[0] = 32768; 1608 net->ipv4.ip_local_ports.range[1] = 60999; 1609 1610 seqlock_init(&net->ipv4.ping_group_range.lock); 1611 /* 1612 * Sane defaults - nobody may create ping sockets. 1613 * Boot scripts should set this to distro-specific group. 1614 */ 1615 net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1); 1616 net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0); 1617 return 0; 1618 } 1619 1620 static __net_exit void inet_exit_net(struct net *net) 1621 { 1622 } 1623 1624 static __net_initdata struct pernet_operations af_inet_ops = { 1625 .init = inet_init_net, 1626 .exit = inet_exit_net, 1627 }; 1628 1629 static int __init init_inet_pernet_ops(void) 1630 { 1631 return register_pernet_subsys(&af_inet_ops); 1632 } 1633 1634 static int ipv4_proc_init(void); 1635 1636 /* 1637 * IP protocol layer initialiser 1638 */ 1639 1640 static struct packet_offload ip_packet_offload __read_mostly = { 1641 .type = cpu_to_be16(ETH_P_IP), 1642 .callbacks = { 1643 .gso_segment = inet_gso_segment, 1644 .gro_receive = inet_gro_receive, 1645 .gro_complete = inet_gro_complete, 1646 }, 1647 }; 1648 1649 static const struct net_offload ipip_offload = { 1650 .callbacks = { 1651 .gso_segment = inet_gso_segment, 1652 .gro_receive = inet_gro_receive, 1653 .gro_complete = inet_gro_complete, 1654 }, 1655 }; 1656 1657 static int __init ipv4_offload_init(void) 1658 { 1659 /* 1660 * Add offloads 1661 */ 1662 if (udpv4_offload_init() < 0) 1663 pr_crit("%s: Cannot add UDP protocol offload\n", __func__); 1664 if (tcpv4_offload_init() < 0) 1665 pr_crit("%s: Cannot add TCP protocol offload\n", __func__); 1666 1667 dev_add_offload(&ip_packet_offload); 1668 inet_add_offload(&ipip_offload, IPPROTO_IPIP); 1669 return 0; 1670 } 1671 1672 fs_initcall(ipv4_offload_init); 1673 1674 static struct packet_type ip_packet_type __read_mostly = { 1675 .type = cpu_to_be16(ETH_P_IP), 1676 .func = ip_rcv, 1677 }; 1678 1679 static int __init inet_init(void) 1680 { 1681 struct inet_protosw *q; 1682 struct list_head *r; 1683 int rc = -EINVAL; 1684 1685 sock_skb_cb_check_size(sizeof(struct inet_skb_parm)); 1686 1687 rc = proto_register(&tcp_prot, 1); 1688 if (rc) 1689 goto out; 1690 1691 rc = proto_register(&udp_prot, 1); 1692 if (rc) 1693 goto out_unregister_tcp_proto; 1694 1695 rc = proto_register(&raw_prot, 1); 1696 if (rc) 1697 goto out_unregister_udp_proto; 1698 1699 rc = proto_register(&ping_prot, 1); 1700 if (rc) 1701 goto out_unregister_raw_proto; 1702 1703 /* 1704 * Tell SOCKET that we are alive... 1705 */ 1706 1707 (void)sock_register(&inet_family_ops); 1708 1709 #ifdef CONFIG_SYSCTL 1710 ip_static_sysctl_init(); 1711 #endif 1712 1713 /* 1714 * Add all the base protocols. 1715 */ 1716 1717 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 1718 pr_crit("%s: Cannot add ICMP protocol\n", __func__); 1719 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) 1720 pr_crit("%s: Cannot add UDP protocol\n", __func__); 1721 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) 1722 pr_crit("%s: Cannot add TCP protocol\n", __func__); 1723 #ifdef CONFIG_IP_MULTICAST 1724 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 1725 pr_crit("%s: Cannot add IGMP protocol\n", __func__); 1726 #endif 1727 1728 /* Register the socket-side information for inet_create. */ 1729 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 1730 INIT_LIST_HEAD(r); 1731 1732 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 1733 inet_register_protosw(q); 1734 1735 /* 1736 * Set the ARP module up 1737 */ 1738 1739 arp_init(); 1740 1741 /* 1742 * Set the IP module up 1743 */ 1744 1745 ip_init(); 1746 1747 tcp_v4_init(); 1748 1749 /* Setup TCP slab cache for open requests. */ 1750 tcp_init(); 1751 1752 /* Setup UDP memory threshold */ 1753 udp_init(); 1754 1755 /* Add UDP-Lite (RFC 3828) */ 1756 udplite4_register(); 1757 1758 ping_init(); 1759 1760 /* 1761 * Set the ICMP layer up 1762 */ 1763 1764 if (icmp_init() < 0) 1765 panic("Failed to create the ICMP control socket.\n"); 1766 1767 /* 1768 * Initialise the multicast router 1769 */ 1770 #if defined(CONFIG_IP_MROUTE) 1771 if (ip_mr_init()) 1772 pr_crit("%s: Cannot init ipv4 mroute\n", __func__); 1773 #endif 1774 1775 if (init_inet_pernet_ops()) 1776 pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__); 1777 /* 1778 * Initialise per-cpu ipv4 mibs 1779 */ 1780 1781 if (init_ipv4_mibs()) 1782 pr_crit("%s: Cannot init ipv4 mibs\n", __func__); 1783 1784 ipv4_proc_init(); 1785 1786 ipfrag_init(); 1787 1788 dev_add_pack(&ip_packet_type); 1789 1790 ip_tunnel_core_init(); 1791 1792 rc = 0; 1793 out: 1794 return rc; 1795 out_unregister_raw_proto: 1796 proto_unregister(&raw_prot); 1797 out_unregister_udp_proto: 1798 proto_unregister(&udp_prot); 1799 out_unregister_tcp_proto: 1800 proto_unregister(&tcp_prot); 1801 goto out; 1802 } 1803 1804 fs_initcall(inet_init); 1805 1806 /* ------------------------------------------------------------------------ */ 1807 1808 #ifdef CONFIG_PROC_FS 1809 static int __init ipv4_proc_init(void) 1810 { 1811 int rc = 0; 1812 1813 if (raw_proc_init()) 1814 goto out_raw; 1815 if (tcp4_proc_init()) 1816 goto out_tcp; 1817 if (udp4_proc_init()) 1818 goto out_udp; 1819 if (ping_proc_init()) 1820 goto out_ping; 1821 if (ip_misc_proc_init()) 1822 goto out_misc; 1823 out: 1824 return rc; 1825 out_misc: 1826 ping_proc_exit(); 1827 out_ping: 1828 udp4_proc_exit(); 1829 out_udp: 1830 tcp4_proc_exit(); 1831 out_tcp: 1832 raw_proc_exit(); 1833 out_raw: 1834 rc = -ENOMEM; 1835 goto out; 1836 } 1837 1838 #else /* CONFIG_PROC_FS */ 1839 static int __init ipv4_proc_init(void) 1840 { 1841 return 0; 1842 } 1843 #endif /* CONFIG_PROC_FS */ 1844 1845 MODULE_ALIAS_NETPROTO(PF_INET); 1846 1847