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/xfrm.h> 116 #include <net/net_namespace.h> 117 #include <net/secure_seq.h> 118 #ifdef CONFIG_IP_MROUTE 119 #include <linux/mroute.h> 120 #endif 121 122 123 /* The inetsw table contains everything that inet_create needs to 124 * build a new socket. 125 */ 126 static struct list_head inetsw[SOCK_MAX]; 127 static DEFINE_SPINLOCK(inetsw_lock); 128 129 /* New destruction routine */ 130 131 void inet_sock_destruct(struct sock *sk) 132 { 133 struct inet_sock *inet = inet_sk(sk); 134 135 __skb_queue_purge(&sk->sk_receive_queue); 136 __skb_queue_purge(&sk->sk_error_queue); 137 138 sk_mem_reclaim(sk); 139 140 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) { 141 pr_err("Attempt to release TCP socket in state %d %p\n", 142 sk->sk_state, sk); 143 return; 144 } 145 if (!sock_flag(sk, SOCK_DEAD)) { 146 pr_err("Attempt to release alive inet socket %p\n", sk); 147 return; 148 } 149 150 WARN_ON(atomic_read(&sk->sk_rmem_alloc)); 151 WARN_ON(atomic_read(&sk->sk_wmem_alloc)); 152 WARN_ON(sk->sk_wmem_queued); 153 WARN_ON(sk->sk_forward_alloc); 154 155 kfree(rcu_dereference_protected(inet->inet_opt, 1)); 156 dst_release(rcu_dereference_check(sk->sk_dst_cache, 1)); 157 dst_release(sk->sk_rx_dst); 158 sk_refcnt_debug_dec(sk); 159 } 160 EXPORT_SYMBOL(inet_sock_destruct); 161 162 /* 163 * The routines beyond this point handle the behaviour of an AF_INET 164 * socket object. Mostly it punts to the subprotocols of IP to do 165 * the work. 166 */ 167 168 /* 169 * Automatically bind an unbound socket. 170 */ 171 172 static int inet_autobind(struct sock *sk) 173 { 174 struct inet_sock *inet; 175 /* We may need to bind the socket. */ 176 lock_sock(sk); 177 inet = inet_sk(sk); 178 if (!inet->inet_num) { 179 if (sk->sk_prot->get_port(sk, 0)) { 180 release_sock(sk); 181 return -EAGAIN; 182 } 183 inet->inet_sport = htons(inet->inet_num); 184 } 185 release_sock(sk); 186 return 0; 187 } 188 189 /* 190 * Move a socket into listening state. 191 */ 192 int inet_listen(struct socket *sock, int backlog) 193 { 194 struct sock *sk = sock->sk; 195 unsigned char old_state; 196 int err; 197 198 lock_sock(sk); 199 200 err = -EINVAL; 201 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM) 202 goto out; 203 204 old_state = sk->sk_state; 205 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN))) 206 goto out; 207 208 /* Really, if the socket is already in listen state 209 * we can only allow the backlog to be adjusted. 210 */ 211 if (old_state != TCP_LISTEN) { 212 /* Check special setups for testing purpose to enable TFO w/o 213 * requiring TCP_FASTOPEN sockopt. 214 * Note that only TCP sockets (SOCK_STREAM) will reach here. 215 * Also fastopenq may already been allocated because this 216 * socket was in TCP_LISTEN state previously but was 217 * shutdown() (rather than close()). 218 */ 219 if ((sysctl_tcp_fastopen & TFO_SERVER_ENABLE) != 0 && 220 !inet_csk(sk)->icsk_accept_queue.fastopenq) { 221 if ((sysctl_tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) != 0) 222 err = fastopen_init_queue(sk, backlog); 223 else if ((sysctl_tcp_fastopen & 224 TFO_SERVER_WO_SOCKOPT2) != 0) 225 err = fastopen_init_queue(sk, 226 ((uint)sysctl_tcp_fastopen) >> 16); 227 else 228 err = 0; 229 if (err) 230 goto out; 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); 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 int err; 428 429 /* If the socket has its own bind function then use it. (RAW) */ 430 if (sk->sk_prot->bind) { 431 err = sk->sk_prot->bind(sk, uaddr, addr_len); 432 goto out; 433 } 434 err = -EINVAL; 435 if (addr_len < sizeof(struct sockaddr_in)) 436 goto out; 437 438 if (addr->sin_family != AF_INET) { 439 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET) 440 * only if s_addr is INADDR_ANY. 441 */ 442 err = -EAFNOSUPPORT; 443 if (addr->sin_family != AF_UNSPEC || 444 addr->sin_addr.s_addr != htonl(INADDR_ANY)) 445 goto out; 446 } 447 448 chk_addr_ret = inet_addr_type(net, addr->sin_addr.s_addr); 449 450 /* Not specified by any standard per-se, however it breaks too 451 * many applications when removed. It is unfortunate since 452 * allowing applications to make a non-local bind solves 453 * several problems with systems using dynamic addressing. 454 * (ie. your servers still start up even if your ISDN link 455 * is temporarily down) 456 */ 457 err = -EADDRNOTAVAIL; 458 if (!net->ipv4.sysctl_ip_nonlocal_bind && 459 !(inet->freebind || inet->transparent) && 460 addr->sin_addr.s_addr != htonl(INADDR_ANY) && 461 chk_addr_ret != RTN_LOCAL && 462 chk_addr_ret != RTN_MULTICAST && 463 chk_addr_ret != RTN_BROADCAST) 464 goto out; 465 466 snum = ntohs(addr->sin_port); 467 err = -EACCES; 468 if (snum && snum < PROT_SOCK && 469 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 470 goto out; 471 472 /* We keep a pair of addresses. rcv_saddr is the one 473 * used by hash lookups, and saddr is used for transmit. 474 * 475 * In the BSD API these are the same except where it 476 * would be illegal to use them (multicast/broadcast) in 477 * which case the sending device address is used. 478 */ 479 lock_sock(sk); 480 481 /* Check these errors (active socket, double bind). */ 482 err = -EINVAL; 483 if (sk->sk_state != TCP_CLOSE || inet->inet_num) 484 goto out_release_sock; 485 486 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 487 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 488 inet->inet_saddr = 0; /* Use device */ 489 490 /* Make sure we are allowed to bind here. */ 491 if (sk->sk_prot->get_port(sk, snum)) { 492 inet->inet_saddr = inet->inet_rcv_saddr = 0; 493 err = -EADDRINUSE; 494 goto out_release_sock; 495 } 496 497 if (inet->inet_rcv_saddr) 498 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 499 if (snum) 500 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 501 inet->inet_sport = htons(inet->inet_num); 502 inet->inet_daddr = 0; 503 inet->inet_dport = 0; 504 sk_dst_reset(sk); 505 err = 0; 506 out_release_sock: 507 release_sock(sk); 508 out: 509 return err; 510 } 511 EXPORT_SYMBOL(inet_bind); 512 513 int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr, 514 int addr_len, int flags) 515 { 516 struct sock *sk = sock->sk; 517 518 if (addr_len < sizeof(uaddr->sa_family)) 519 return -EINVAL; 520 if (uaddr->sa_family == AF_UNSPEC) 521 return sk->sk_prot->disconnect(sk, flags); 522 523 if (!inet_sk(sk)->inet_num && inet_autobind(sk)) 524 return -EAGAIN; 525 return sk->sk_prot->connect(sk, uaddr, addr_len); 526 } 527 EXPORT_SYMBOL(inet_dgram_connect); 528 529 static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias) 530 { 531 DEFINE_WAIT(wait); 532 533 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 534 sk->sk_write_pending += writebias; 535 536 /* Basic assumption: if someone sets sk->sk_err, he _must_ 537 * change state of the socket from TCP_SYN_*. 538 * Connect() does not allow to get error notifications 539 * without closing the socket. 540 */ 541 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 542 release_sock(sk); 543 timeo = schedule_timeout(timeo); 544 lock_sock(sk); 545 if (signal_pending(current) || !timeo) 546 break; 547 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 548 } 549 finish_wait(sk_sleep(sk), &wait); 550 sk->sk_write_pending -= writebias; 551 return timeo; 552 } 553 554 /* 555 * Connect to a remote host. There is regrettably still a little 556 * TCP 'magic' in here. 557 */ 558 int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 559 int addr_len, int flags) 560 { 561 struct sock *sk = sock->sk; 562 int err; 563 long timeo; 564 565 if (addr_len < sizeof(uaddr->sa_family)) 566 return -EINVAL; 567 568 if (uaddr->sa_family == AF_UNSPEC) { 569 err = sk->sk_prot->disconnect(sk, flags); 570 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 571 goto out; 572 } 573 574 switch (sock->state) { 575 default: 576 err = -EINVAL; 577 goto out; 578 case SS_CONNECTED: 579 err = -EISCONN; 580 goto out; 581 case SS_CONNECTING: 582 err = -EALREADY; 583 /* Fall out of switch with err, set for this state */ 584 break; 585 case SS_UNCONNECTED: 586 err = -EISCONN; 587 if (sk->sk_state != TCP_CLOSE) 588 goto out; 589 590 err = sk->sk_prot->connect(sk, uaddr, addr_len); 591 if (err < 0) 592 goto out; 593 594 sock->state = SS_CONNECTING; 595 596 /* Just entered SS_CONNECTING state; the only 597 * difference is that return value in non-blocking 598 * case is EINPROGRESS, rather than EALREADY. 599 */ 600 err = -EINPROGRESS; 601 break; 602 } 603 604 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 605 606 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 607 int writebias = (sk->sk_protocol == IPPROTO_TCP) && 608 tcp_sk(sk)->fastopen_req && 609 tcp_sk(sk)->fastopen_req->data ? 1 : 0; 610 611 /* Error code is set above */ 612 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias)) 613 goto out; 614 615 err = sock_intr_errno(timeo); 616 if (signal_pending(current)) 617 goto out; 618 } 619 620 /* Connection was closed by RST, timeout, ICMP error 621 * or another process disconnected us. 622 */ 623 if (sk->sk_state == TCP_CLOSE) 624 goto sock_error; 625 626 /* sk->sk_err may be not zero now, if RECVERR was ordered by user 627 * and error was received after socket entered established state. 628 * Hence, it is handled normally after connect() return successfully. 629 */ 630 631 sock->state = SS_CONNECTED; 632 err = 0; 633 out: 634 return err; 635 636 sock_error: 637 err = sock_error(sk) ? : -ECONNABORTED; 638 sock->state = SS_UNCONNECTED; 639 if (sk->sk_prot->disconnect(sk, flags)) 640 sock->state = SS_DISCONNECTING; 641 goto out; 642 } 643 EXPORT_SYMBOL(__inet_stream_connect); 644 645 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 646 int addr_len, int flags) 647 { 648 int err; 649 650 lock_sock(sock->sk); 651 err = __inet_stream_connect(sock, uaddr, addr_len, flags); 652 release_sock(sock->sk); 653 return err; 654 } 655 EXPORT_SYMBOL(inet_stream_connect); 656 657 /* 658 * Accept a pending connection. The TCP layer now gives BSD semantics. 659 */ 660 661 int inet_accept(struct socket *sock, struct socket *newsock, int flags) 662 { 663 struct sock *sk1 = sock->sk; 664 int err = -EINVAL; 665 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err); 666 667 if (!sk2) 668 goto do_err; 669 670 lock_sock(sk2); 671 672 sock_rps_record_flow(sk2); 673 WARN_ON(!((1 << sk2->sk_state) & 674 (TCPF_ESTABLISHED | TCPF_SYN_RECV | 675 TCPF_CLOSE_WAIT | TCPF_CLOSE))); 676 677 sock_graft(sk2, newsock); 678 679 newsock->state = SS_CONNECTED; 680 err = 0; 681 release_sock(sk2); 682 do_err: 683 return err; 684 } 685 EXPORT_SYMBOL(inet_accept); 686 687 688 /* 689 * This does both peername and sockname. 690 */ 691 int inet_getname(struct socket *sock, struct sockaddr *uaddr, 692 int *uaddr_len, int peer) 693 { 694 struct sock *sk = sock->sk; 695 struct inet_sock *inet = inet_sk(sk); 696 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr); 697 698 sin->sin_family = AF_INET; 699 if (peer) { 700 if (!inet->inet_dport || 701 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 702 peer == 1)) 703 return -ENOTCONN; 704 sin->sin_port = inet->inet_dport; 705 sin->sin_addr.s_addr = inet->inet_daddr; 706 } else { 707 __be32 addr = inet->inet_rcv_saddr; 708 if (!addr) 709 addr = inet->inet_saddr; 710 sin->sin_port = inet->inet_sport; 711 sin->sin_addr.s_addr = addr; 712 } 713 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 714 *uaddr_len = sizeof(*sin); 715 return 0; 716 } 717 EXPORT_SYMBOL(inet_getname); 718 719 int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) 720 { 721 struct sock *sk = sock->sk; 722 723 sock_rps_record_flow(sk); 724 725 /* We may need to bind the socket. */ 726 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 727 inet_autobind(sk)) 728 return -EAGAIN; 729 730 return sk->sk_prot->sendmsg(sk, msg, size); 731 } 732 EXPORT_SYMBOL(inet_sendmsg); 733 734 ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, 735 size_t size, int flags) 736 { 737 struct sock *sk = sock->sk; 738 739 sock_rps_record_flow(sk); 740 741 /* We may need to bind the socket. */ 742 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 743 inet_autobind(sk)) 744 return -EAGAIN; 745 746 if (sk->sk_prot->sendpage) 747 return sk->sk_prot->sendpage(sk, page, offset, size, flags); 748 return sock_no_sendpage(sock, page, offset, size, flags); 749 } 750 EXPORT_SYMBOL(inet_sendpage); 751 752 int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 753 int flags) 754 { 755 struct sock *sk = sock->sk; 756 int addr_len = 0; 757 int err; 758 759 sock_rps_record_flow(sk); 760 761 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT, 762 flags & ~MSG_DONTWAIT, &addr_len); 763 if (err >= 0) 764 msg->msg_namelen = addr_len; 765 return err; 766 } 767 EXPORT_SYMBOL(inet_recvmsg); 768 769 int inet_shutdown(struct socket *sock, int how) 770 { 771 struct sock *sk = sock->sk; 772 int err = 0; 773 774 /* This should really check to make sure 775 * the socket is a TCP socket. (WHY AC...) 776 */ 777 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and 778 1->2 bit 2 snds. 779 2->3 */ 780 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ 781 return -EINVAL; 782 783 lock_sock(sk); 784 if (sock->state == SS_CONNECTING) { 785 if ((1 << sk->sk_state) & 786 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) 787 sock->state = SS_DISCONNECTING; 788 else 789 sock->state = SS_CONNECTED; 790 } 791 792 switch (sk->sk_state) { 793 case TCP_CLOSE: 794 err = -ENOTCONN; 795 /* Hack to wake up other listeners, who can poll for 796 POLLHUP, even on eg. unconnected UDP sockets -- RR */ 797 default: 798 sk->sk_shutdown |= how; 799 if (sk->sk_prot->shutdown) 800 sk->sk_prot->shutdown(sk, how); 801 break; 802 803 /* Remaining two branches are temporary solution for missing 804 * close() in multithreaded environment. It is _not_ a good idea, 805 * but we have no choice until close() is repaired at VFS level. 806 */ 807 case TCP_LISTEN: 808 if (!(how & RCV_SHUTDOWN)) 809 break; 810 /* Fall through */ 811 case TCP_SYN_SENT: 812 err = sk->sk_prot->disconnect(sk, O_NONBLOCK); 813 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 814 break; 815 } 816 817 /* Wake up anyone sleeping in poll. */ 818 sk->sk_state_change(sk); 819 release_sock(sk); 820 return err; 821 } 822 EXPORT_SYMBOL(inet_shutdown); 823 824 /* 825 * ioctl() calls you can issue on an INET socket. Most of these are 826 * device configuration and stuff and very rarely used. Some ioctls 827 * pass on to the socket itself. 828 * 829 * NOTE: I like the idea of a module for the config stuff. ie ifconfig 830 * loads the devconfigure module does its configuring and unloads it. 831 * There's a good 20K of config code hanging around the kernel. 832 */ 833 834 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 835 { 836 struct sock *sk = sock->sk; 837 int err = 0; 838 struct net *net = sock_net(sk); 839 840 switch (cmd) { 841 case SIOCGSTAMP: 842 err = sock_get_timestamp(sk, (struct timeval __user *)arg); 843 break; 844 case SIOCGSTAMPNS: 845 err = sock_get_timestampns(sk, (struct timespec __user *)arg); 846 break; 847 case SIOCADDRT: 848 case SIOCDELRT: 849 case SIOCRTMSG: 850 err = ip_rt_ioctl(net, cmd, (void __user *)arg); 851 break; 852 case SIOCDARP: 853 case SIOCGARP: 854 case SIOCSARP: 855 err = arp_ioctl(net, cmd, (void __user *)arg); 856 break; 857 case SIOCGIFADDR: 858 case SIOCSIFADDR: 859 case SIOCGIFBRDADDR: 860 case SIOCSIFBRDADDR: 861 case SIOCGIFNETMASK: 862 case SIOCSIFNETMASK: 863 case SIOCGIFDSTADDR: 864 case SIOCSIFDSTADDR: 865 case SIOCSIFPFLAGS: 866 case SIOCGIFPFLAGS: 867 case SIOCSIFFLAGS: 868 err = devinet_ioctl(net, cmd, (void __user *)arg); 869 break; 870 default: 871 if (sk->sk_prot->ioctl) 872 err = sk->sk_prot->ioctl(sk, cmd, arg); 873 else 874 err = -ENOIOCTLCMD; 875 break; 876 } 877 return err; 878 } 879 EXPORT_SYMBOL(inet_ioctl); 880 881 #ifdef CONFIG_COMPAT 882 static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 883 { 884 struct sock *sk = sock->sk; 885 int err = -ENOIOCTLCMD; 886 887 if (sk->sk_prot->compat_ioctl) 888 err = sk->sk_prot->compat_ioctl(sk, cmd, arg); 889 890 return err; 891 } 892 #endif 893 894 const struct proto_ops inet_stream_ops = { 895 .family = PF_INET, 896 .owner = THIS_MODULE, 897 .release = inet_release, 898 .bind = inet_bind, 899 .connect = inet_stream_connect, 900 .socketpair = sock_no_socketpair, 901 .accept = inet_accept, 902 .getname = inet_getname, 903 .poll = tcp_poll, 904 .ioctl = inet_ioctl, 905 .listen = inet_listen, 906 .shutdown = inet_shutdown, 907 .setsockopt = sock_common_setsockopt, 908 .getsockopt = sock_common_getsockopt, 909 .sendmsg = inet_sendmsg, 910 .recvmsg = inet_recvmsg, 911 .mmap = sock_no_mmap, 912 .sendpage = inet_sendpage, 913 .splice_read = tcp_splice_read, 914 #ifdef CONFIG_COMPAT 915 .compat_setsockopt = compat_sock_common_setsockopt, 916 .compat_getsockopt = compat_sock_common_getsockopt, 917 .compat_ioctl = inet_compat_ioctl, 918 #endif 919 }; 920 EXPORT_SYMBOL(inet_stream_ops); 921 922 const struct proto_ops inet_dgram_ops = { 923 .family = PF_INET, 924 .owner = THIS_MODULE, 925 .release = inet_release, 926 .bind = inet_bind, 927 .connect = inet_dgram_connect, 928 .socketpair = sock_no_socketpair, 929 .accept = sock_no_accept, 930 .getname = inet_getname, 931 .poll = udp_poll, 932 .ioctl = inet_ioctl, 933 .listen = sock_no_listen, 934 .shutdown = inet_shutdown, 935 .setsockopt = sock_common_setsockopt, 936 .getsockopt = sock_common_getsockopt, 937 .sendmsg = inet_sendmsg, 938 .recvmsg = inet_recvmsg, 939 .mmap = sock_no_mmap, 940 .sendpage = inet_sendpage, 941 #ifdef CONFIG_COMPAT 942 .compat_setsockopt = compat_sock_common_setsockopt, 943 .compat_getsockopt = compat_sock_common_getsockopt, 944 .compat_ioctl = inet_compat_ioctl, 945 #endif 946 }; 947 EXPORT_SYMBOL(inet_dgram_ops); 948 949 /* 950 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 951 * udp_poll 952 */ 953 static const struct proto_ops inet_sockraw_ops = { 954 .family = PF_INET, 955 .owner = THIS_MODULE, 956 .release = inet_release, 957 .bind = inet_bind, 958 .connect = inet_dgram_connect, 959 .socketpair = sock_no_socketpair, 960 .accept = sock_no_accept, 961 .getname = inet_getname, 962 .poll = datagram_poll, 963 .ioctl = inet_ioctl, 964 .listen = sock_no_listen, 965 .shutdown = inet_shutdown, 966 .setsockopt = sock_common_setsockopt, 967 .getsockopt = sock_common_getsockopt, 968 .sendmsg = inet_sendmsg, 969 .recvmsg = inet_recvmsg, 970 .mmap = sock_no_mmap, 971 .sendpage = inet_sendpage, 972 #ifdef CONFIG_COMPAT 973 .compat_setsockopt = compat_sock_common_setsockopt, 974 .compat_getsockopt = compat_sock_common_getsockopt, 975 .compat_ioctl = inet_compat_ioctl, 976 #endif 977 }; 978 979 static const struct net_proto_family inet_family_ops = { 980 .family = PF_INET, 981 .create = inet_create, 982 .owner = THIS_MODULE, 983 }; 984 985 /* Upon startup we insert all the elements in inetsw_array[] into 986 * the linked list inetsw. 987 */ 988 static struct inet_protosw inetsw_array[] = 989 { 990 { 991 .type = SOCK_STREAM, 992 .protocol = IPPROTO_TCP, 993 .prot = &tcp_prot, 994 .ops = &inet_stream_ops, 995 .flags = INET_PROTOSW_PERMANENT | 996 INET_PROTOSW_ICSK, 997 }, 998 999 { 1000 .type = SOCK_DGRAM, 1001 .protocol = IPPROTO_UDP, 1002 .prot = &udp_prot, 1003 .ops = &inet_dgram_ops, 1004 .flags = INET_PROTOSW_PERMANENT, 1005 }, 1006 1007 { 1008 .type = SOCK_DGRAM, 1009 .protocol = IPPROTO_ICMP, 1010 .prot = &ping_prot, 1011 .ops = &inet_dgram_ops, 1012 .flags = INET_PROTOSW_REUSE, 1013 }, 1014 1015 { 1016 .type = SOCK_RAW, 1017 .protocol = IPPROTO_IP, /* wild card */ 1018 .prot = &raw_prot, 1019 .ops = &inet_sockraw_ops, 1020 .flags = INET_PROTOSW_REUSE, 1021 } 1022 }; 1023 1024 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) 1025 1026 void inet_register_protosw(struct inet_protosw *p) 1027 { 1028 struct list_head *lh; 1029 struct inet_protosw *answer; 1030 int protocol = p->protocol; 1031 struct list_head *last_perm; 1032 1033 spin_lock_bh(&inetsw_lock); 1034 1035 if (p->type >= SOCK_MAX) 1036 goto out_illegal; 1037 1038 /* If we are trying to override a permanent protocol, bail. */ 1039 answer = NULL; 1040 last_perm = &inetsw[p->type]; 1041 list_for_each(lh, &inetsw[p->type]) { 1042 answer = list_entry(lh, struct inet_protosw, list); 1043 1044 /* Check only the non-wild match. */ 1045 if (INET_PROTOSW_PERMANENT & answer->flags) { 1046 if (protocol == answer->protocol) 1047 break; 1048 last_perm = lh; 1049 } 1050 1051 answer = NULL; 1052 } 1053 if (answer) 1054 goto out_permanent; 1055 1056 /* Add the new entry after the last permanent entry if any, so that 1057 * the new entry does not override a permanent entry when matched with 1058 * a wild-card protocol. But it is allowed to override any existing 1059 * non-permanent entry. This means that when we remove this entry, the 1060 * system automatically returns to the old behavior. 1061 */ 1062 list_add_rcu(&p->list, last_perm); 1063 out: 1064 spin_unlock_bh(&inetsw_lock); 1065 1066 return; 1067 1068 out_permanent: 1069 pr_err("Attempt to override permanent protocol %d\n", protocol); 1070 goto out; 1071 1072 out_illegal: 1073 pr_err("Ignoring attempt to register invalid socket type %d\n", 1074 p->type); 1075 goto out; 1076 } 1077 EXPORT_SYMBOL(inet_register_protosw); 1078 1079 void inet_unregister_protosw(struct inet_protosw *p) 1080 { 1081 if (INET_PROTOSW_PERMANENT & p->flags) { 1082 pr_err("Attempt to unregister permanent protocol %d\n", 1083 p->protocol); 1084 } else { 1085 spin_lock_bh(&inetsw_lock); 1086 list_del_rcu(&p->list); 1087 spin_unlock_bh(&inetsw_lock); 1088 1089 synchronize_net(); 1090 } 1091 } 1092 EXPORT_SYMBOL(inet_unregister_protosw); 1093 1094 /* 1095 * Shall we try to damage output packets if routing dev changes? 1096 */ 1097 1098 int sysctl_ip_dynaddr __read_mostly; 1099 1100 static int inet_sk_reselect_saddr(struct sock *sk) 1101 { 1102 struct inet_sock *inet = inet_sk(sk); 1103 __be32 old_saddr = inet->inet_saddr; 1104 __be32 daddr = inet->inet_daddr; 1105 struct flowi4 *fl4; 1106 struct rtable *rt; 1107 __be32 new_saddr; 1108 struct ip_options_rcu *inet_opt; 1109 1110 inet_opt = rcu_dereference_protected(inet->inet_opt, 1111 sock_owned_by_user(sk)); 1112 if (inet_opt && inet_opt->opt.srr) 1113 daddr = inet_opt->opt.faddr; 1114 1115 /* Query new route. */ 1116 fl4 = &inet->cork.fl.u.ip4; 1117 rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk), 1118 sk->sk_bound_dev_if, sk->sk_protocol, 1119 inet->inet_sport, inet->inet_dport, sk); 1120 if (IS_ERR(rt)) 1121 return PTR_ERR(rt); 1122 1123 sk_setup_caps(sk, &rt->dst); 1124 1125 new_saddr = fl4->saddr; 1126 1127 if (new_saddr == old_saddr) 1128 return 0; 1129 1130 if (sysctl_ip_dynaddr > 1) { 1131 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n", 1132 __func__, &old_saddr, &new_saddr); 1133 } 1134 1135 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr; 1136 1137 /* 1138 * XXX The only one ugly spot where we need to 1139 * XXX really change the sockets identity after 1140 * XXX it has entered the hashes. -DaveM 1141 * 1142 * Besides that, it does not check for connection 1143 * uniqueness. Wait for troubles. 1144 */ 1145 __sk_prot_rehash(sk); 1146 return 0; 1147 } 1148 1149 int inet_sk_rebuild_header(struct sock *sk) 1150 { 1151 struct inet_sock *inet = inet_sk(sk); 1152 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); 1153 __be32 daddr; 1154 struct ip_options_rcu *inet_opt; 1155 struct flowi4 *fl4; 1156 int err; 1157 1158 /* Route is OK, nothing to do. */ 1159 if (rt) 1160 return 0; 1161 1162 /* Reroute. */ 1163 rcu_read_lock(); 1164 inet_opt = rcu_dereference(inet->inet_opt); 1165 daddr = inet->inet_daddr; 1166 if (inet_opt && inet_opt->opt.srr) 1167 daddr = inet_opt->opt.faddr; 1168 rcu_read_unlock(); 1169 fl4 = &inet->cork.fl.u.ip4; 1170 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr, 1171 inet->inet_dport, inet->inet_sport, 1172 sk->sk_protocol, RT_CONN_FLAGS(sk), 1173 sk->sk_bound_dev_if); 1174 if (!IS_ERR(rt)) { 1175 err = 0; 1176 sk_setup_caps(sk, &rt->dst); 1177 } else { 1178 err = PTR_ERR(rt); 1179 1180 /* Routing failed... */ 1181 sk->sk_route_caps = 0; 1182 /* 1183 * Other protocols have to map its equivalent state to TCP_SYN_SENT. 1184 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme 1185 */ 1186 if (!sysctl_ip_dynaddr || 1187 sk->sk_state != TCP_SYN_SENT || 1188 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 1189 (err = inet_sk_reselect_saddr(sk)) != 0) 1190 sk->sk_err_soft = -err; 1191 } 1192 1193 return err; 1194 } 1195 EXPORT_SYMBOL(inet_sk_rebuild_header); 1196 1197 static struct sk_buff *inet_gso_segment(struct sk_buff *skb, 1198 netdev_features_t features) 1199 { 1200 struct sk_buff *segs = ERR_PTR(-EINVAL); 1201 const struct net_offload *ops; 1202 unsigned int offset = 0; 1203 bool udpfrag, encap; 1204 struct iphdr *iph; 1205 int proto; 1206 int nhoff; 1207 int ihl; 1208 int id; 1209 1210 if (unlikely(skb_shinfo(skb)->gso_type & 1211 ~(SKB_GSO_TCPV4 | 1212 SKB_GSO_UDP | 1213 SKB_GSO_DODGY | 1214 SKB_GSO_TCP_ECN | 1215 SKB_GSO_GRE | 1216 SKB_GSO_GRE_CSUM | 1217 SKB_GSO_IPIP | 1218 SKB_GSO_SIT | 1219 SKB_GSO_TCPV6 | 1220 SKB_GSO_UDP_TUNNEL | 1221 SKB_GSO_UDP_TUNNEL_CSUM | 1222 SKB_GSO_TUNNEL_REMCSUM | 1223 0))) 1224 goto out; 1225 1226 skb_reset_network_header(skb); 1227 nhoff = skb_network_header(skb) - skb_mac_header(skb); 1228 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1229 goto out; 1230 1231 iph = ip_hdr(skb); 1232 ihl = iph->ihl * 4; 1233 if (ihl < sizeof(*iph)) 1234 goto out; 1235 1236 id = ntohs(iph->id); 1237 proto = iph->protocol; 1238 1239 /* Warning: after this point, iph might be no longer valid */ 1240 if (unlikely(!pskb_may_pull(skb, ihl))) 1241 goto out; 1242 __skb_pull(skb, ihl); 1243 1244 encap = SKB_GSO_CB(skb)->encap_level > 0; 1245 if (encap) 1246 features &= skb->dev->hw_enc_features; 1247 SKB_GSO_CB(skb)->encap_level += ihl; 1248 1249 skb_reset_transport_header(skb); 1250 1251 segs = ERR_PTR(-EPROTONOSUPPORT); 1252 1253 if (skb->encapsulation && 1254 skb_shinfo(skb)->gso_type & (SKB_GSO_SIT|SKB_GSO_IPIP)) 1255 udpfrag = proto == IPPROTO_UDP && encap; 1256 else 1257 udpfrag = proto == IPPROTO_UDP && !skb->encapsulation; 1258 1259 ops = rcu_dereference(inet_offloads[proto]); 1260 if (likely(ops && ops->callbacks.gso_segment)) 1261 segs = ops->callbacks.gso_segment(skb, features); 1262 1263 if (IS_ERR_OR_NULL(segs)) 1264 goto out; 1265 1266 skb = segs; 1267 do { 1268 iph = (struct iphdr *)(skb_mac_header(skb) + nhoff); 1269 if (udpfrag) { 1270 iph->id = htons(id); 1271 iph->frag_off = htons(offset >> 3); 1272 if (skb->next) 1273 iph->frag_off |= htons(IP_MF); 1274 offset += skb->len - nhoff - ihl; 1275 } else { 1276 iph->id = htons(id++); 1277 } 1278 iph->tot_len = htons(skb->len - nhoff); 1279 ip_send_check(iph); 1280 if (encap) 1281 skb_reset_inner_headers(skb); 1282 skb->network_header = (u8 *)iph - skb->head; 1283 } while ((skb = skb->next)); 1284 1285 out: 1286 return segs; 1287 } 1288 1289 static struct sk_buff **inet_gro_receive(struct sk_buff **head, 1290 struct sk_buff *skb) 1291 { 1292 const struct net_offload *ops; 1293 struct sk_buff **pp = NULL; 1294 struct sk_buff *p; 1295 const struct iphdr *iph; 1296 unsigned int hlen; 1297 unsigned int off; 1298 unsigned int id; 1299 int flush = 1; 1300 int proto; 1301 1302 off = skb_gro_offset(skb); 1303 hlen = off + sizeof(*iph); 1304 iph = skb_gro_header_fast(skb, off); 1305 if (skb_gro_header_hard(skb, hlen)) { 1306 iph = skb_gro_header_slow(skb, hlen, off); 1307 if (unlikely(!iph)) 1308 goto out; 1309 } 1310 1311 proto = iph->protocol; 1312 1313 rcu_read_lock(); 1314 ops = rcu_dereference(inet_offloads[proto]); 1315 if (!ops || !ops->callbacks.gro_receive) 1316 goto out_unlock; 1317 1318 if (*(u8 *)iph != 0x45) 1319 goto out_unlock; 1320 1321 if (unlikely(ip_fast_csum((u8 *)iph, 5))) 1322 goto out_unlock; 1323 1324 id = ntohl(*(__be32 *)&iph->id); 1325 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF)); 1326 id >>= 16; 1327 1328 for (p = *head; p; p = p->next) { 1329 struct iphdr *iph2; 1330 1331 if (!NAPI_GRO_CB(p)->same_flow) 1332 continue; 1333 1334 iph2 = (struct iphdr *)(p->data + off); 1335 /* The above works because, with the exception of the top 1336 * (inner most) layer, we only aggregate pkts with the same 1337 * hdr length so all the hdrs we'll need to verify will start 1338 * at the same offset. 1339 */ 1340 if ((iph->protocol ^ iph2->protocol) | 1341 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) | 1342 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) { 1343 NAPI_GRO_CB(p)->same_flow = 0; 1344 continue; 1345 } 1346 1347 /* All fields must match except length and checksum. */ 1348 NAPI_GRO_CB(p)->flush |= 1349 (iph->ttl ^ iph2->ttl) | 1350 (iph->tos ^ iph2->tos) | 1351 ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF)); 1352 1353 /* Save the IP ID check to be included later when we get to 1354 * the transport layer so only the inner most IP ID is checked. 1355 * This is because some GSO/TSO implementations do not 1356 * correctly increment the IP ID for the outer hdrs. 1357 */ 1358 NAPI_GRO_CB(p)->flush_id = 1359 ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id); 1360 NAPI_GRO_CB(p)->flush |= flush; 1361 } 1362 1363 NAPI_GRO_CB(skb)->flush |= flush; 1364 skb_set_network_header(skb, off); 1365 /* The above will be needed by the transport layer if there is one 1366 * immediately following this IP hdr. 1367 */ 1368 1369 /* Note : No need to call skb_gro_postpull_rcsum() here, 1370 * as we already checked checksum over ipv4 header was 0 1371 */ 1372 skb_gro_pull(skb, sizeof(*iph)); 1373 skb_set_transport_header(skb, skb_gro_offset(skb)); 1374 1375 pp = ops->callbacks.gro_receive(head, skb); 1376 1377 out_unlock: 1378 rcu_read_unlock(); 1379 1380 out: 1381 NAPI_GRO_CB(skb)->flush |= flush; 1382 1383 return pp; 1384 } 1385 1386 int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 1387 { 1388 if (sk->sk_family == AF_INET) 1389 return ip_recv_error(sk, msg, len, addr_len); 1390 #if IS_ENABLED(CONFIG_IPV6) 1391 if (sk->sk_family == AF_INET6) 1392 return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len); 1393 #endif 1394 return -EINVAL; 1395 } 1396 1397 static int inet_gro_complete(struct sk_buff *skb, int nhoff) 1398 { 1399 __be16 newlen = htons(skb->len - nhoff); 1400 struct iphdr *iph = (struct iphdr *)(skb->data + nhoff); 1401 const struct net_offload *ops; 1402 int proto = iph->protocol; 1403 int err = -ENOSYS; 1404 1405 if (skb->encapsulation) 1406 skb_set_inner_network_header(skb, nhoff); 1407 1408 csum_replace2(&iph->check, iph->tot_len, newlen); 1409 iph->tot_len = newlen; 1410 1411 rcu_read_lock(); 1412 ops = rcu_dereference(inet_offloads[proto]); 1413 if (WARN_ON(!ops || !ops->callbacks.gro_complete)) 1414 goto out_unlock; 1415 1416 /* Only need to add sizeof(*iph) to get to the next hdr below 1417 * because any hdr with option will have been flushed in 1418 * inet_gro_receive(). 1419 */ 1420 err = ops->callbacks.gro_complete(skb, nhoff + sizeof(*iph)); 1421 1422 out_unlock: 1423 rcu_read_unlock(); 1424 1425 return err; 1426 } 1427 1428 int inet_ctl_sock_create(struct sock **sk, unsigned short family, 1429 unsigned short type, unsigned char protocol, 1430 struct net *net) 1431 { 1432 struct socket *sock; 1433 int rc = sock_create_kern(family, type, protocol, &sock); 1434 1435 if (rc == 0) { 1436 *sk = sock->sk; 1437 (*sk)->sk_allocation = GFP_ATOMIC; 1438 /* 1439 * Unhash it so that IP input processing does not even see it, 1440 * we do not wish this socket to see incoming packets. 1441 */ 1442 (*sk)->sk_prot->unhash(*sk); 1443 1444 sk_change_net(*sk, net); 1445 } 1446 return rc; 1447 } 1448 EXPORT_SYMBOL_GPL(inet_ctl_sock_create); 1449 1450 unsigned long snmp_fold_field(void __percpu *mib, int offt) 1451 { 1452 unsigned long res = 0; 1453 int i; 1454 1455 for_each_possible_cpu(i) 1456 res += *(((unsigned long *) per_cpu_ptr(mib, i)) + offt); 1457 return res; 1458 } 1459 EXPORT_SYMBOL_GPL(snmp_fold_field); 1460 1461 #if BITS_PER_LONG==32 1462 1463 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset) 1464 { 1465 u64 res = 0; 1466 int cpu; 1467 1468 for_each_possible_cpu(cpu) { 1469 void *bhptr; 1470 struct u64_stats_sync *syncp; 1471 u64 v; 1472 unsigned int start; 1473 1474 bhptr = per_cpu_ptr(mib, cpu); 1475 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset); 1476 do { 1477 start = u64_stats_fetch_begin_irq(syncp); 1478 v = *(((u64 *) bhptr) + offt); 1479 } while (u64_stats_fetch_retry_irq(syncp, start)); 1480 1481 res += v; 1482 } 1483 return res; 1484 } 1485 EXPORT_SYMBOL_GPL(snmp_fold_field64); 1486 #endif 1487 1488 #ifdef CONFIG_IP_MULTICAST 1489 static const struct net_protocol igmp_protocol = { 1490 .handler = igmp_rcv, 1491 .netns_ok = 1, 1492 }; 1493 #endif 1494 1495 static const struct net_protocol tcp_protocol = { 1496 .early_demux = tcp_v4_early_demux, 1497 .handler = tcp_v4_rcv, 1498 .err_handler = tcp_v4_err, 1499 .no_policy = 1, 1500 .netns_ok = 1, 1501 .icmp_strict_tag_validation = 1, 1502 }; 1503 1504 static const struct net_protocol udp_protocol = { 1505 .early_demux = udp_v4_early_demux, 1506 .handler = udp_rcv, 1507 .err_handler = udp_err, 1508 .no_policy = 1, 1509 .netns_ok = 1, 1510 }; 1511 1512 static const struct net_protocol icmp_protocol = { 1513 .handler = icmp_rcv, 1514 .err_handler = icmp_err, 1515 .no_policy = 1, 1516 .netns_ok = 1, 1517 }; 1518 1519 static __net_init int ipv4_mib_init_net(struct net *net) 1520 { 1521 int i; 1522 1523 net->mib.tcp_statistics = alloc_percpu(struct tcp_mib); 1524 if (!net->mib.tcp_statistics) 1525 goto err_tcp_mib; 1526 net->mib.ip_statistics = alloc_percpu(struct ipstats_mib); 1527 if (!net->mib.ip_statistics) 1528 goto err_ip_mib; 1529 1530 for_each_possible_cpu(i) { 1531 struct ipstats_mib *af_inet_stats; 1532 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i); 1533 u64_stats_init(&af_inet_stats->syncp); 1534 } 1535 1536 net->mib.net_statistics = alloc_percpu(struct linux_mib); 1537 if (!net->mib.net_statistics) 1538 goto err_net_mib; 1539 net->mib.udp_statistics = alloc_percpu(struct udp_mib); 1540 if (!net->mib.udp_statistics) 1541 goto err_udp_mib; 1542 net->mib.udplite_statistics = alloc_percpu(struct udp_mib); 1543 if (!net->mib.udplite_statistics) 1544 goto err_udplite_mib; 1545 net->mib.icmp_statistics = alloc_percpu(struct icmp_mib); 1546 if (!net->mib.icmp_statistics) 1547 goto err_icmp_mib; 1548 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib), 1549 GFP_KERNEL); 1550 if (!net->mib.icmpmsg_statistics) 1551 goto err_icmpmsg_mib; 1552 1553 tcp_mib_init(net); 1554 return 0; 1555 1556 err_icmpmsg_mib: 1557 free_percpu(net->mib.icmp_statistics); 1558 err_icmp_mib: 1559 free_percpu(net->mib.udplite_statistics); 1560 err_udplite_mib: 1561 free_percpu(net->mib.udp_statistics); 1562 err_udp_mib: 1563 free_percpu(net->mib.net_statistics); 1564 err_net_mib: 1565 free_percpu(net->mib.ip_statistics); 1566 err_ip_mib: 1567 free_percpu(net->mib.tcp_statistics); 1568 err_tcp_mib: 1569 return -ENOMEM; 1570 } 1571 1572 static __net_exit void ipv4_mib_exit_net(struct net *net) 1573 { 1574 kfree(net->mib.icmpmsg_statistics); 1575 free_percpu(net->mib.icmp_statistics); 1576 free_percpu(net->mib.udplite_statistics); 1577 free_percpu(net->mib.udp_statistics); 1578 free_percpu(net->mib.net_statistics); 1579 free_percpu(net->mib.ip_statistics); 1580 free_percpu(net->mib.tcp_statistics); 1581 } 1582 1583 static __net_initdata struct pernet_operations ipv4_mib_ops = { 1584 .init = ipv4_mib_init_net, 1585 .exit = ipv4_mib_exit_net, 1586 }; 1587 1588 static int __init init_ipv4_mibs(void) 1589 { 1590 return register_pernet_subsys(&ipv4_mib_ops); 1591 } 1592 1593 static __net_init int inet_init_net(struct net *net) 1594 { 1595 /* 1596 * Set defaults for local port range 1597 */ 1598 seqlock_init(&net->ipv4.ip_local_ports.lock); 1599 net->ipv4.ip_local_ports.range[0] = 32768; 1600 net->ipv4.ip_local_ports.range[1] = 61000; 1601 1602 seqlock_init(&net->ipv4.ping_group_range.lock); 1603 /* 1604 * Sane defaults - nobody may create ping sockets. 1605 * Boot scripts should set this to distro-specific group. 1606 */ 1607 net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1); 1608 net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0); 1609 return 0; 1610 } 1611 1612 static __net_exit void inet_exit_net(struct net *net) 1613 { 1614 } 1615 1616 static __net_initdata struct pernet_operations af_inet_ops = { 1617 .init = inet_init_net, 1618 .exit = inet_exit_net, 1619 }; 1620 1621 static int __init init_inet_pernet_ops(void) 1622 { 1623 return register_pernet_subsys(&af_inet_ops); 1624 } 1625 1626 static int ipv4_proc_init(void); 1627 1628 /* 1629 * IP protocol layer initialiser 1630 */ 1631 1632 static struct packet_offload ip_packet_offload __read_mostly = { 1633 .type = cpu_to_be16(ETH_P_IP), 1634 .callbacks = { 1635 .gso_segment = inet_gso_segment, 1636 .gro_receive = inet_gro_receive, 1637 .gro_complete = inet_gro_complete, 1638 }, 1639 }; 1640 1641 static const struct net_offload ipip_offload = { 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 int __init ipv4_offload_init(void) 1650 { 1651 /* 1652 * Add offloads 1653 */ 1654 if (udpv4_offload_init() < 0) 1655 pr_crit("%s: Cannot add UDP protocol offload\n", __func__); 1656 if (tcpv4_offload_init() < 0) 1657 pr_crit("%s: Cannot add TCP protocol offload\n", __func__); 1658 1659 dev_add_offload(&ip_packet_offload); 1660 inet_add_offload(&ipip_offload, IPPROTO_IPIP); 1661 return 0; 1662 } 1663 1664 fs_initcall(ipv4_offload_init); 1665 1666 static struct packet_type ip_packet_type __read_mostly = { 1667 .type = cpu_to_be16(ETH_P_IP), 1668 .func = ip_rcv, 1669 }; 1670 1671 static int __init inet_init(void) 1672 { 1673 struct inet_protosw *q; 1674 struct list_head *r; 1675 int rc = -EINVAL; 1676 1677 sock_skb_cb_check_size(sizeof(struct inet_skb_parm)); 1678 1679 rc = proto_register(&tcp_prot, 1); 1680 if (rc) 1681 goto out; 1682 1683 rc = proto_register(&udp_prot, 1); 1684 if (rc) 1685 goto out_unregister_tcp_proto; 1686 1687 rc = proto_register(&raw_prot, 1); 1688 if (rc) 1689 goto out_unregister_udp_proto; 1690 1691 rc = proto_register(&ping_prot, 1); 1692 if (rc) 1693 goto out_unregister_raw_proto; 1694 1695 /* 1696 * Tell SOCKET that we are alive... 1697 */ 1698 1699 (void)sock_register(&inet_family_ops); 1700 1701 #ifdef CONFIG_SYSCTL 1702 ip_static_sysctl_init(); 1703 #endif 1704 1705 /* 1706 * Add all the base protocols. 1707 */ 1708 1709 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 1710 pr_crit("%s: Cannot add ICMP protocol\n", __func__); 1711 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) 1712 pr_crit("%s: Cannot add UDP protocol\n", __func__); 1713 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) 1714 pr_crit("%s: Cannot add TCP protocol\n", __func__); 1715 #ifdef CONFIG_IP_MULTICAST 1716 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 1717 pr_crit("%s: Cannot add IGMP protocol\n", __func__); 1718 #endif 1719 1720 /* Register the socket-side information for inet_create. */ 1721 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 1722 INIT_LIST_HEAD(r); 1723 1724 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 1725 inet_register_protosw(q); 1726 1727 /* 1728 * Set the ARP module up 1729 */ 1730 1731 arp_init(); 1732 1733 /* 1734 * Set the IP module up 1735 */ 1736 1737 ip_init(); 1738 1739 tcp_v4_init(); 1740 1741 /* Setup TCP slab cache for open requests. */ 1742 tcp_init(); 1743 1744 /* Setup UDP memory threshold */ 1745 udp_init(); 1746 1747 /* Add UDP-Lite (RFC 3828) */ 1748 udplite4_register(); 1749 1750 ping_init(); 1751 1752 /* 1753 * Set the ICMP layer up 1754 */ 1755 1756 if (icmp_init() < 0) 1757 panic("Failed to create the ICMP control socket.\n"); 1758 1759 /* 1760 * Initialise the multicast router 1761 */ 1762 #if defined(CONFIG_IP_MROUTE) 1763 if (ip_mr_init()) 1764 pr_crit("%s: Cannot init ipv4 mroute\n", __func__); 1765 #endif 1766 1767 if (init_inet_pernet_ops()) 1768 pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__); 1769 /* 1770 * Initialise per-cpu ipv4 mibs 1771 */ 1772 1773 if (init_ipv4_mibs()) 1774 pr_crit("%s: Cannot init ipv4 mibs\n", __func__); 1775 1776 ipv4_proc_init(); 1777 1778 ipfrag_init(); 1779 1780 dev_add_pack(&ip_packet_type); 1781 1782 rc = 0; 1783 out: 1784 return rc; 1785 out_unregister_raw_proto: 1786 proto_unregister(&raw_prot); 1787 out_unregister_udp_proto: 1788 proto_unregister(&udp_prot); 1789 out_unregister_tcp_proto: 1790 proto_unregister(&tcp_prot); 1791 goto out; 1792 } 1793 1794 fs_initcall(inet_init); 1795 1796 /* ------------------------------------------------------------------------ */ 1797 1798 #ifdef CONFIG_PROC_FS 1799 static int __init ipv4_proc_init(void) 1800 { 1801 int rc = 0; 1802 1803 if (raw_proc_init()) 1804 goto out_raw; 1805 if (tcp4_proc_init()) 1806 goto out_tcp; 1807 if (udp4_proc_init()) 1808 goto out_udp; 1809 if (ping_proc_init()) 1810 goto out_ping; 1811 if (ip_misc_proc_init()) 1812 goto out_misc; 1813 out: 1814 return rc; 1815 out_misc: 1816 ping_proc_exit(); 1817 out_ping: 1818 udp4_proc_exit(); 1819 out_udp: 1820 tcp4_proc_exit(); 1821 out_tcp: 1822 raw_proc_exit(); 1823 out_raw: 1824 rc = -ENOMEM; 1825 goto out; 1826 } 1827 1828 #else /* CONFIG_PROC_FS */ 1829 static int __init ipv4_proc_init(void) 1830 { 1831 return 0; 1832 } 1833 #endif /* CONFIG_PROC_FS */ 1834 1835 MODULE_ALIAS_NETPROTO(PF_INET); 1836 1837