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/ipip.h> 115 #include <net/inet_common.h> 116 #include <net/xfrm.h> 117 #include <net/net_namespace.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 struct ipv4_config ipv4_config; 130 EXPORT_SYMBOL(ipv4_config); 131 132 /* New destruction routine */ 133 134 void inet_sock_destruct(struct sock *sk) 135 { 136 struct inet_sock *inet = inet_sk(sk); 137 138 __skb_queue_purge(&sk->sk_receive_queue); 139 __skb_queue_purge(&sk->sk_error_queue); 140 141 sk_mem_reclaim(sk); 142 143 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) { 144 pr_err("Attempt to release TCP socket in state %d %p\n", 145 sk->sk_state, sk); 146 return; 147 } 148 if (!sock_flag(sk, SOCK_DEAD)) { 149 pr_err("Attempt to release alive inet socket %p\n", sk); 150 return; 151 } 152 153 WARN_ON(atomic_read(&sk->sk_rmem_alloc)); 154 WARN_ON(atomic_read(&sk->sk_wmem_alloc)); 155 WARN_ON(sk->sk_wmem_queued); 156 WARN_ON(sk->sk_forward_alloc); 157 158 kfree(rcu_dereference_protected(inet->inet_opt, 1)); 159 dst_release(rcu_dereference_check(sk->sk_dst_cache, 1)); 160 dst_release(sk->sk_rx_dst); 161 sk_refcnt_debug_dec(sk); 162 } 163 EXPORT_SYMBOL(inet_sock_destruct); 164 165 /* 166 * The routines beyond this point handle the behaviour of an AF_INET 167 * socket object. Mostly it punts to the subprotocols of IP to do 168 * the work. 169 */ 170 171 /* 172 * Automatically bind an unbound socket. 173 */ 174 175 static int inet_autobind(struct sock *sk) 176 { 177 struct inet_sock *inet; 178 /* We may need to bind the socket. */ 179 lock_sock(sk); 180 inet = inet_sk(sk); 181 if (!inet->inet_num) { 182 if (sk->sk_prot->get_port(sk, 0)) { 183 release_sock(sk); 184 return -EAGAIN; 185 } 186 inet->inet_sport = htons(inet->inet_num); 187 } 188 release_sock(sk); 189 return 0; 190 } 191 192 /* 193 * Move a socket into listening state. 194 */ 195 int inet_listen(struct socket *sock, int backlog) 196 { 197 struct sock *sk = sock->sk; 198 unsigned char old_state; 199 int err; 200 201 lock_sock(sk); 202 203 err = -EINVAL; 204 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM) 205 goto out; 206 207 old_state = sk->sk_state; 208 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN))) 209 goto out; 210 211 /* Really, if the socket is already in listen state 212 * we can only allow the backlog to be adjusted. 213 */ 214 if (old_state != TCP_LISTEN) { 215 err = inet_csk_listen_start(sk, backlog); 216 if (err) 217 goto out; 218 } 219 sk->sk_max_ack_backlog = backlog; 220 err = 0; 221 222 out: 223 release_sock(sk); 224 return err; 225 } 226 EXPORT_SYMBOL(inet_listen); 227 228 u32 inet_ehash_secret __read_mostly; 229 EXPORT_SYMBOL(inet_ehash_secret); 230 231 /* 232 * inet_ehash_secret must be set exactly once 233 */ 234 void build_ehash_secret(void) 235 { 236 u32 rnd; 237 238 do { 239 get_random_bytes(&rnd, sizeof(rnd)); 240 } while (rnd == 0); 241 242 cmpxchg(&inet_ehash_secret, 0, rnd); 243 } 244 EXPORT_SYMBOL(build_ehash_secret); 245 246 static inline int inet_netns_ok(struct net *net, __u8 protocol) 247 { 248 const struct net_protocol *ipprot; 249 250 if (net_eq(net, &init_net)) 251 return 1; 252 253 ipprot = rcu_dereference(inet_protos[protocol]); 254 if (ipprot == NULL) { 255 /* raw IP is OK */ 256 return 1; 257 } 258 return ipprot->netns_ok; 259 } 260 261 /* 262 * Create an inet socket. 263 */ 264 265 static int inet_create(struct net *net, struct socket *sock, int protocol, 266 int kern) 267 { 268 struct sock *sk; 269 struct inet_protosw *answer; 270 struct inet_sock *inet; 271 struct proto *answer_prot; 272 unsigned char answer_flags; 273 char answer_no_check; 274 int try_loading_module = 0; 275 int err; 276 277 if (unlikely(!inet_ehash_secret)) 278 if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM) 279 build_ehash_secret(); 280 281 sock->state = SS_UNCONNECTED; 282 283 /* Look for the requested type/protocol pair. */ 284 lookup_protocol: 285 err = -ESOCKTNOSUPPORT; 286 rcu_read_lock(); 287 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) { 288 289 err = 0; 290 /* Check the non-wild match. */ 291 if (protocol == answer->protocol) { 292 if (protocol != IPPROTO_IP) 293 break; 294 } else { 295 /* Check for the two wild cases. */ 296 if (IPPROTO_IP == protocol) { 297 protocol = answer->protocol; 298 break; 299 } 300 if (IPPROTO_IP == answer->protocol) 301 break; 302 } 303 err = -EPROTONOSUPPORT; 304 } 305 306 if (unlikely(err)) { 307 if (try_loading_module < 2) { 308 rcu_read_unlock(); 309 /* 310 * Be more specific, e.g. net-pf-2-proto-132-type-1 311 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) 312 */ 313 if (++try_loading_module == 1) 314 request_module("net-pf-%d-proto-%d-type-%d", 315 PF_INET, protocol, sock->type); 316 /* 317 * Fall back to generic, e.g. net-pf-2-proto-132 318 * (net-pf-PF_INET-proto-IPPROTO_SCTP) 319 */ 320 else 321 request_module("net-pf-%d-proto-%d", 322 PF_INET, protocol); 323 goto lookup_protocol; 324 } else 325 goto out_rcu_unlock; 326 } 327 328 err = -EPERM; 329 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW)) 330 goto out_rcu_unlock; 331 332 err = -EAFNOSUPPORT; 333 if (!inet_netns_ok(net, protocol)) 334 goto out_rcu_unlock; 335 336 sock->ops = answer->ops; 337 answer_prot = answer->prot; 338 answer_no_check = answer->no_check; 339 answer_flags = answer->flags; 340 rcu_read_unlock(); 341 342 WARN_ON(answer_prot->slab == NULL); 343 344 err = -ENOBUFS; 345 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot); 346 if (sk == NULL) 347 goto out; 348 349 err = 0; 350 sk->sk_no_check = answer_no_check; 351 if (INET_PROTOSW_REUSE & answer_flags) 352 sk->sk_reuse = SK_CAN_REUSE; 353 354 inet = inet_sk(sk); 355 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 356 357 inet->nodefrag = 0; 358 359 if (SOCK_RAW == sock->type) { 360 inet->inet_num = protocol; 361 if (IPPROTO_RAW == protocol) 362 inet->hdrincl = 1; 363 } 364 365 if (ipv4_config.no_pmtu_disc) 366 inet->pmtudisc = IP_PMTUDISC_DONT; 367 else 368 inet->pmtudisc = IP_PMTUDISC_WANT; 369 370 inet->inet_id = 0; 371 372 sock_init_data(sock, sk); 373 374 sk->sk_destruct = inet_sock_destruct; 375 sk->sk_protocol = protocol; 376 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 377 378 inet->uc_ttl = -1; 379 inet->mc_loop = 1; 380 inet->mc_ttl = 1; 381 inet->mc_all = 1; 382 inet->mc_index = 0; 383 inet->mc_list = NULL; 384 inet->rcv_tos = 0; 385 386 sk_refcnt_debug_inc(sk); 387 388 if (inet->inet_num) { 389 /* It assumes that any protocol which allows 390 * the user to assign a number at socket 391 * creation time automatically 392 * shares. 393 */ 394 inet->inet_sport = htons(inet->inet_num); 395 /* Add to protocol hash chains. */ 396 sk->sk_prot->hash(sk); 397 } 398 399 if (sk->sk_prot->init) { 400 err = sk->sk_prot->init(sk); 401 if (err) 402 sk_common_release(sk); 403 } 404 out: 405 return err; 406 out_rcu_unlock: 407 rcu_read_unlock(); 408 goto out; 409 } 410 411 412 /* 413 * The peer socket should always be NULL (or else). When we call this 414 * function we are destroying the object and from then on nobody 415 * should refer to it. 416 */ 417 int inet_release(struct socket *sock) 418 { 419 struct sock *sk = sock->sk; 420 421 if (sk) { 422 long timeout; 423 424 sock_rps_reset_flow(sk); 425 426 /* Applications forget to leave groups before exiting */ 427 ip_mc_drop_socket(sk); 428 429 /* If linger is set, we don't return until the close 430 * is complete. Otherwise we return immediately. The 431 * actually closing is done the same either way. 432 * 433 * If the close is due to the process exiting, we never 434 * linger.. 435 */ 436 timeout = 0; 437 if (sock_flag(sk, SOCK_LINGER) && 438 !(current->flags & PF_EXITING)) 439 timeout = sk->sk_lingertime; 440 sock->sk = NULL; 441 sk->sk_prot->close(sk, timeout); 442 } 443 return 0; 444 } 445 EXPORT_SYMBOL(inet_release); 446 447 /* It is off by default, see below. */ 448 int sysctl_ip_nonlocal_bind __read_mostly; 449 EXPORT_SYMBOL(sysctl_ip_nonlocal_bind); 450 451 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 452 { 453 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 454 struct sock *sk = sock->sk; 455 struct inet_sock *inet = inet_sk(sk); 456 unsigned short snum; 457 int chk_addr_ret; 458 int err; 459 460 /* If the socket has its own bind function then use it. (RAW) */ 461 if (sk->sk_prot->bind) { 462 err = sk->sk_prot->bind(sk, uaddr, addr_len); 463 goto out; 464 } 465 err = -EINVAL; 466 if (addr_len < sizeof(struct sockaddr_in)) 467 goto out; 468 469 if (addr->sin_family != AF_INET) { 470 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET) 471 * only if s_addr is INADDR_ANY. 472 */ 473 err = -EAFNOSUPPORT; 474 if (addr->sin_family != AF_UNSPEC || 475 addr->sin_addr.s_addr != htonl(INADDR_ANY)) 476 goto out; 477 } 478 479 chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr); 480 481 /* Not specified by any standard per-se, however it breaks too 482 * many applications when removed. It is unfortunate since 483 * allowing applications to make a non-local bind solves 484 * several problems with systems using dynamic addressing. 485 * (ie. your servers still start up even if your ISDN link 486 * is temporarily down) 487 */ 488 err = -EADDRNOTAVAIL; 489 if (!sysctl_ip_nonlocal_bind && 490 !(inet->freebind || inet->transparent) && 491 addr->sin_addr.s_addr != htonl(INADDR_ANY) && 492 chk_addr_ret != RTN_LOCAL && 493 chk_addr_ret != RTN_MULTICAST && 494 chk_addr_ret != RTN_BROADCAST) 495 goto out; 496 497 snum = ntohs(addr->sin_port); 498 err = -EACCES; 499 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) 500 goto out; 501 502 /* We keep a pair of addresses. rcv_saddr is the one 503 * used by hash lookups, and saddr is used for transmit. 504 * 505 * In the BSD API these are the same except where it 506 * would be illegal to use them (multicast/broadcast) in 507 * which case the sending device address is used. 508 */ 509 lock_sock(sk); 510 511 /* Check these errors (active socket, double bind). */ 512 err = -EINVAL; 513 if (sk->sk_state != TCP_CLOSE || inet->inet_num) 514 goto out_release_sock; 515 516 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 517 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 518 inet->inet_saddr = 0; /* Use device */ 519 520 /* Make sure we are allowed to bind here. */ 521 if (sk->sk_prot->get_port(sk, snum)) { 522 inet->inet_saddr = inet->inet_rcv_saddr = 0; 523 err = -EADDRINUSE; 524 goto out_release_sock; 525 } 526 527 if (inet->inet_rcv_saddr) 528 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 529 if (snum) 530 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 531 inet->inet_sport = htons(inet->inet_num); 532 inet->inet_daddr = 0; 533 inet->inet_dport = 0; 534 sk_dst_reset(sk); 535 err = 0; 536 out_release_sock: 537 release_sock(sk); 538 out: 539 return err; 540 } 541 EXPORT_SYMBOL(inet_bind); 542 543 int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr, 544 int addr_len, int flags) 545 { 546 struct sock *sk = sock->sk; 547 548 if (addr_len < sizeof(uaddr->sa_family)) 549 return -EINVAL; 550 if (uaddr->sa_family == AF_UNSPEC) 551 return sk->sk_prot->disconnect(sk, flags); 552 553 if (!inet_sk(sk)->inet_num && inet_autobind(sk)) 554 return -EAGAIN; 555 return sk->sk_prot->connect(sk, uaddr, addr_len); 556 } 557 EXPORT_SYMBOL(inet_dgram_connect); 558 559 static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias) 560 { 561 DEFINE_WAIT(wait); 562 563 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 564 sk->sk_write_pending += writebias; 565 566 /* Basic assumption: if someone sets sk->sk_err, he _must_ 567 * change state of the socket from TCP_SYN_*. 568 * Connect() does not allow to get error notifications 569 * without closing the socket. 570 */ 571 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 572 release_sock(sk); 573 timeo = schedule_timeout(timeo); 574 lock_sock(sk); 575 if (signal_pending(current) || !timeo) 576 break; 577 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 578 } 579 finish_wait(sk_sleep(sk), &wait); 580 sk->sk_write_pending -= writebias; 581 return timeo; 582 } 583 584 /* 585 * Connect to a remote host. There is regrettably still a little 586 * TCP 'magic' in here. 587 */ 588 int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 589 int addr_len, int flags) 590 { 591 struct sock *sk = sock->sk; 592 int err; 593 long timeo; 594 595 if (addr_len < sizeof(uaddr->sa_family)) 596 return -EINVAL; 597 598 if (uaddr->sa_family == AF_UNSPEC) { 599 err = sk->sk_prot->disconnect(sk, flags); 600 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 601 goto out; 602 } 603 604 switch (sock->state) { 605 default: 606 err = -EINVAL; 607 goto out; 608 case SS_CONNECTED: 609 err = -EISCONN; 610 goto out; 611 case SS_CONNECTING: 612 err = -EALREADY; 613 /* Fall out of switch with err, set for this state */ 614 break; 615 case SS_UNCONNECTED: 616 err = -EISCONN; 617 if (sk->sk_state != TCP_CLOSE) 618 goto out; 619 620 err = sk->sk_prot->connect(sk, uaddr, addr_len); 621 if (err < 0) 622 goto out; 623 624 sock->state = SS_CONNECTING; 625 626 /* Just entered SS_CONNECTING state; the only 627 * difference is that return value in non-blocking 628 * case is EINPROGRESS, rather than EALREADY. 629 */ 630 err = -EINPROGRESS; 631 break; 632 } 633 634 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 635 636 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 637 int writebias = (sk->sk_protocol == IPPROTO_TCP) && 638 tcp_sk(sk)->fastopen_req && 639 tcp_sk(sk)->fastopen_req->data ? 1 : 0; 640 641 /* Error code is set above */ 642 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias)) 643 goto out; 644 645 err = sock_intr_errno(timeo); 646 if (signal_pending(current)) 647 goto out; 648 } 649 650 /* Connection was closed by RST, timeout, ICMP error 651 * or another process disconnected us. 652 */ 653 if (sk->sk_state == TCP_CLOSE) 654 goto sock_error; 655 656 /* sk->sk_err may be not zero now, if RECVERR was ordered by user 657 * and error was received after socket entered established state. 658 * Hence, it is handled normally after connect() return successfully. 659 */ 660 661 sock->state = SS_CONNECTED; 662 err = 0; 663 out: 664 return err; 665 666 sock_error: 667 err = sock_error(sk) ? : -ECONNABORTED; 668 sock->state = SS_UNCONNECTED; 669 if (sk->sk_prot->disconnect(sk, flags)) 670 sock->state = SS_DISCONNECTING; 671 goto out; 672 } 673 EXPORT_SYMBOL(__inet_stream_connect); 674 675 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 676 int addr_len, int flags) 677 { 678 int err; 679 680 lock_sock(sock->sk); 681 err = __inet_stream_connect(sock, uaddr, addr_len, flags); 682 release_sock(sock->sk); 683 return err; 684 } 685 EXPORT_SYMBOL(inet_stream_connect); 686 687 /* 688 * Accept a pending connection. The TCP layer now gives BSD semantics. 689 */ 690 691 int inet_accept(struct socket *sock, struct socket *newsock, int flags) 692 { 693 struct sock *sk1 = sock->sk; 694 int err = -EINVAL; 695 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err); 696 697 if (!sk2) 698 goto do_err; 699 700 lock_sock(sk2); 701 702 sock_rps_record_flow(sk2); 703 WARN_ON(!((1 << sk2->sk_state) & 704 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE))); 705 706 sock_graft(sk2, newsock); 707 708 newsock->state = SS_CONNECTED; 709 err = 0; 710 release_sock(sk2); 711 do_err: 712 return err; 713 } 714 EXPORT_SYMBOL(inet_accept); 715 716 717 /* 718 * This does both peername and sockname. 719 */ 720 int inet_getname(struct socket *sock, struct sockaddr *uaddr, 721 int *uaddr_len, int peer) 722 { 723 struct sock *sk = sock->sk; 724 struct inet_sock *inet = inet_sk(sk); 725 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr); 726 727 sin->sin_family = AF_INET; 728 if (peer) { 729 if (!inet->inet_dport || 730 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 731 peer == 1)) 732 return -ENOTCONN; 733 sin->sin_port = inet->inet_dport; 734 sin->sin_addr.s_addr = inet->inet_daddr; 735 } else { 736 __be32 addr = inet->inet_rcv_saddr; 737 if (!addr) 738 addr = inet->inet_saddr; 739 sin->sin_port = inet->inet_sport; 740 sin->sin_addr.s_addr = addr; 741 } 742 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 743 *uaddr_len = sizeof(*sin); 744 return 0; 745 } 746 EXPORT_SYMBOL(inet_getname); 747 748 int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 749 size_t size) 750 { 751 struct sock *sk = sock->sk; 752 753 sock_rps_record_flow(sk); 754 755 /* We may need to bind the socket. */ 756 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 757 inet_autobind(sk)) 758 return -EAGAIN; 759 760 return sk->sk_prot->sendmsg(iocb, sk, msg, size); 761 } 762 EXPORT_SYMBOL(inet_sendmsg); 763 764 ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, 765 size_t size, int flags) 766 { 767 struct sock *sk = sock->sk; 768 769 sock_rps_record_flow(sk); 770 771 /* We may need to bind the socket. */ 772 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 773 inet_autobind(sk)) 774 return -EAGAIN; 775 776 if (sk->sk_prot->sendpage) 777 return sk->sk_prot->sendpage(sk, page, offset, size, flags); 778 return sock_no_sendpage(sock, page, offset, size, flags); 779 } 780 EXPORT_SYMBOL(inet_sendpage); 781 782 int inet_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 783 size_t size, int flags) 784 { 785 struct sock *sk = sock->sk; 786 int addr_len = 0; 787 int err; 788 789 sock_rps_record_flow(sk); 790 791 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, 792 flags & ~MSG_DONTWAIT, &addr_len); 793 if (err >= 0) 794 msg->msg_namelen = addr_len; 795 return err; 796 } 797 EXPORT_SYMBOL(inet_recvmsg); 798 799 int inet_shutdown(struct socket *sock, int how) 800 { 801 struct sock *sk = sock->sk; 802 int err = 0; 803 804 /* This should really check to make sure 805 * the socket is a TCP socket. (WHY AC...) 806 */ 807 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and 808 1->2 bit 2 snds. 809 2->3 */ 810 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ 811 return -EINVAL; 812 813 lock_sock(sk); 814 if (sock->state == SS_CONNECTING) { 815 if ((1 << sk->sk_state) & 816 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) 817 sock->state = SS_DISCONNECTING; 818 else 819 sock->state = SS_CONNECTED; 820 } 821 822 switch (sk->sk_state) { 823 case TCP_CLOSE: 824 err = -ENOTCONN; 825 /* Hack to wake up other listeners, who can poll for 826 POLLHUP, even on eg. unconnected UDP sockets -- RR */ 827 default: 828 sk->sk_shutdown |= how; 829 if (sk->sk_prot->shutdown) 830 sk->sk_prot->shutdown(sk, how); 831 break; 832 833 /* Remaining two branches are temporary solution for missing 834 * close() in multithreaded environment. It is _not_ a good idea, 835 * but we have no choice until close() is repaired at VFS level. 836 */ 837 case TCP_LISTEN: 838 if (!(how & RCV_SHUTDOWN)) 839 break; 840 /* Fall through */ 841 case TCP_SYN_SENT: 842 err = sk->sk_prot->disconnect(sk, O_NONBLOCK); 843 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 844 break; 845 } 846 847 /* Wake up anyone sleeping in poll. */ 848 sk->sk_state_change(sk); 849 release_sock(sk); 850 return err; 851 } 852 EXPORT_SYMBOL(inet_shutdown); 853 854 /* 855 * ioctl() calls you can issue on an INET socket. Most of these are 856 * device configuration and stuff and very rarely used. Some ioctls 857 * pass on to the socket itself. 858 * 859 * NOTE: I like the idea of a module for the config stuff. ie ifconfig 860 * loads the devconfigure module does its configuring and unloads it. 861 * There's a good 20K of config code hanging around the kernel. 862 */ 863 864 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 865 { 866 struct sock *sk = sock->sk; 867 int err = 0; 868 struct net *net = sock_net(sk); 869 870 switch (cmd) { 871 case SIOCGSTAMP: 872 err = sock_get_timestamp(sk, (struct timeval __user *)arg); 873 break; 874 case SIOCGSTAMPNS: 875 err = sock_get_timestampns(sk, (struct timespec __user *)arg); 876 break; 877 case SIOCADDRT: 878 case SIOCDELRT: 879 case SIOCRTMSG: 880 err = ip_rt_ioctl(net, cmd, (void __user *)arg); 881 break; 882 case SIOCDARP: 883 case SIOCGARP: 884 case SIOCSARP: 885 err = arp_ioctl(net, cmd, (void __user *)arg); 886 break; 887 case SIOCGIFADDR: 888 case SIOCSIFADDR: 889 case SIOCGIFBRDADDR: 890 case SIOCSIFBRDADDR: 891 case SIOCGIFNETMASK: 892 case SIOCSIFNETMASK: 893 case SIOCGIFDSTADDR: 894 case SIOCSIFDSTADDR: 895 case SIOCSIFPFLAGS: 896 case SIOCGIFPFLAGS: 897 case SIOCSIFFLAGS: 898 err = devinet_ioctl(net, cmd, (void __user *)arg); 899 break; 900 default: 901 if (sk->sk_prot->ioctl) 902 err = sk->sk_prot->ioctl(sk, cmd, arg); 903 else 904 err = -ENOIOCTLCMD; 905 break; 906 } 907 return err; 908 } 909 EXPORT_SYMBOL(inet_ioctl); 910 911 #ifdef CONFIG_COMPAT 912 static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 913 { 914 struct sock *sk = sock->sk; 915 int err = -ENOIOCTLCMD; 916 917 if (sk->sk_prot->compat_ioctl) 918 err = sk->sk_prot->compat_ioctl(sk, cmd, arg); 919 920 return err; 921 } 922 #endif 923 924 const struct proto_ops inet_stream_ops = { 925 .family = PF_INET, 926 .owner = THIS_MODULE, 927 .release = inet_release, 928 .bind = inet_bind, 929 .connect = inet_stream_connect, 930 .socketpair = sock_no_socketpair, 931 .accept = inet_accept, 932 .getname = inet_getname, 933 .poll = tcp_poll, 934 .ioctl = inet_ioctl, 935 .listen = inet_listen, 936 .shutdown = inet_shutdown, 937 .setsockopt = sock_common_setsockopt, 938 .getsockopt = sock_common_getsockopt, 939 .sendmsg = inet_sendmsg, 940 .recvmsg = inet_recvmsg, 941 .mmap = sock_no_mmap, 942 .sendpage = inet_sendpage, 943 .splice_read = tcp_splice_read, 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_stream_ops); 951 952 const struct proto_ops inet_dgram_ops = { 953 .family = PF_INET, 954 .owner = THIS_MODULE, 955 .release = inet_release, 956 .bind = inet_bind, 957 .connect = inet_dgram_connect, 958 .socketpair = sock_no_socketpair, 959 .accept = sock_no_accept, 960 .getname = inet_getname, 961 .poll = udp_poll, 962 .ioctl = inet_ioctl, 963 .listen = sock_no_listen, 964 .shutdown = inet_shutdown, 965 .setsockopt = sock_common_setsockopt, 966 .getsockopt = sock_common_getsockopt, 967 .sendmsg = inet_sendmsg, 968 .recvmsg = inet_recvmsg, 969 .mmap = sock_no_mmap, 970 .sendpage = inet_sendpage, 971 #ifdef CONFIG_COMPAT 972 .compat_setsockopt = compat_sock_common_setsockopt, 973 .compat_getsockopt = compat_sock_common_getsockopt, 974 .compat_ioctl = inet_compat_ioctl, 975 #endif 976 }; 977 EXPORT_SYMBOL(inet_dgram_ops); 978 979 /* 980 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 981 * udp_poll 982 */ 983 static const struct proto_ops inet_sockraw_ops = { 984 .family = PF_INET, 985 .owner = THIS_MODULE, 986 .release = inet_release, 987 .bind = inet_bind, 988 .connect = inet_dgram_connect, 989 .socketpair = sock_no_socketpair, 990 .accept = sock_no_accept, 991 .getname = inet_getname, 992 .poll = datagram_poll, 993 .ioctl = inet_ioctl, 994 .listen = sock_no_listen, 995 .shutdown = inet_shutdown, 996 .setsockopt = sock_common_setsockopt, 997 .getsockopt = sock_common_getsockopt, 998 .sendmsg = inet_sendmsg, 999 .recvmsg = inet_recvmsg, 1000 .mmap = sock_no_mmap, 1001 .sendpage = inet_sendpage, 1002 #ifdef CONFIG_COMPAT 1003 .compat_setsockopt = compat_sock_common_setsockopt, 1004 .compat_getsockopt = compat_sock_common_getsockopt, 1005 .compat_ioctl = inet_compat_ioctl, 1006 #endif 1007 }; 1008 1009 static const struct net_proto_family inet_family_ops = { 1010 .family = PF_INET, 1011 .create = inet_create, 1012 .owner = THIS_MODULE, 1013 }; 1014 1015 /* Upon startup we insert all the elements in inetsw_array[] into 1016 * the linked list inetsw. 1017 */ 1018 static struct inet_protosw inetsw_array[] = 1019 { 1020 { 1021 .type = SOCK_STREAM, 1022 .protocol = IPPROTO_TCP, 1023 .prot = &tcp_prot, 1024 .ops = &inet_stream_ops, 1025 .no_check = 0, 1026 .flags = INET_PROTOSW_PERMANENT | 1027 INET_PROTOSW_ICSK, 1028 }, 1029 1030 { 1031 .type = SOCK_DGRAM, 1032 .protocol = IPPROTO_UDP, 1033 .prot = &udp_prot, 1034 .ops = &inet_dgram_ops, 1035 .no_check = UDP_CSUM_DEFAULT, 1036 .flags = INET_PROTOSW_PERMANENT, 1037 }, 1038 1039 { 1040 .type = SOCK_DGRAM, 1041 .protocol = IPPROTO_ICMP, 1042 .prot = &ping_prot, 1043 .ops = &inet_dgram_ops, 1044 .no_check = UDP_CSUM_DEFAULT, 1045 .flags = INET_PROTOSW_REUSE, 1046 }, 1047 1048 { 1049 .type = SOCK_RAW, 1050 .protocol = IPPROTO_IP, /* wild card */ 1051 .prot = &raw_prot, 1052 .ops = &inet_sockraw_ops, 1053 .no_check = UDP_CSUM_DEFAULT, 1054 .flags = INET_PROTOSW_REUSE, 1055 } 1056 }; 1057 1058 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) 1059 1060 void inet_register_protosw(struct inet_protosw *p) 1061 { 1062 struct list_head *lh; 1063 struct inet_protosw *answer; 1064 int protocol = p->protocol; 1065 struct list_head *last_perm; 1066 1067 spin_lock_bh(&inetsw_lock); 1068 1069 if (p->type >= SOCK_MAX) 1070 goto out_illegal; 1071 1072 /* If we are trying to override a permanent protocol, bail. */ 1073 answer = NULL; 1074 last_perm = &inetsw[p->type]; 1075 list_for_each(lh, &inetsw[p->type]) { 1076 answer = list_entry(lh, struct inet_protosw, list); 1077 1078 /* Check only the non-wild match. */ 1079 if (INET_PROTOSW_PERMANENT & answer->flags) { 1080 if (protocol == answer->protocol) 1081 break; 1082 last_perm = lh; 1083 } 1084 1085 answer = NULL; 1086 } 1087 if (answer) 1088 goto out_permanent; 1089 1090 /* Add the new entry after the last permanent entry if any, so that 1091 * the new entry does not override a permanent entry when matched with 1092 * a wild-card protocol. But it is allowed to override any existing 1093 * non-permanent entry. This means that when we remove this entry, the 1094 * system automatically returns to the old behavior. 1095 */ 1096 list_add_rcu(&p->list, last_perm); 1097 out: 1098 spin_unlock_bh(&inetsw_lock); 1099 1100 return; 1101 1102 out_permanent: 1103 pr_err("Attempt to override permanent protocol %d\n", protocol); 1104 goto out; 1105 1106 out_illegal: 1107 pr_err("Ignoring attempt to register invalid socket type %d\n", 1108 p->type); 1109 goto out; 1110 } 1111 EXPORT_SYMBOL(inet_register_protosw); 1112 1113 void inet_unregister_protosw(struct inet_protosw *p) 1114 { 1115 if (INET_PROTOSW_PERMANENT & p->flags) { 1116 pr_err("Attempt to unregister permanent protocol %d\n", 1117 p->protocol); 1118 } else { 1119 spin_lock_bh(&inetsw_lock); 1120 list_del_rcu(&p->list); 1121 spin_unlock_bh(&inetsw_lock); 1122 1123 synchronize_net(); 1124 } 1125 } 1126 EXPORT_SYMBOL(inet_unregister_protosw); 1127 1128 /* 1129 * Shall we try to damage output packets if routing dev changes? 1130 */ 1131 1132 int sysctl_ip_dynaddr __read_mostly; 1133 1134 static int inet_sk_reselect_saddr(struct sock *sk) 1135 { 1136 struct inet_sock *inet = inet_sk(sk); 1137 __be32 old_saddr = inet->inet_saddr; 1138 __be32 daddr = inet->inet_daddr; 1139 struct flowi4 *fl4; 1140 struct rtable *rt; 1141 __be32 new_saddr; 1142 struct ip_options_rcu *inet_opt; 1143 1144 inet_opt = rcu_dereference_protected(inet->inet_opt, 1145 sock_owned_by_user(sk)); 1146 if (inet_opt && inet_opt->opt.srr) 1147 daddr = inet_opt->opt.faddr; 1148 1149 /* Query new route. */ 1150 fl4 = &inet->cork.fl.u.ip4; 1151 rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk), 1152 sk->sk_bound_dev_if, sk->sk_protocol, 1153 inet->inet_sport, inet->inet_dport, sk, false); 1154 if (IS_ERR(rt)) 1155 return PTR_ERR(rt); 1156 1157 sk_setup_caps(sk, &rt->dst); 1158 1159 new_saddr = fl4->saddr; 1160 1161 if (new_saddr == old_saddr) 1162 return 0; 1163 1164 if (sysctl_ip_dynaddr > 1) { 1165 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n", 1166 __func__, &old_saddr, &new_saddr); 1167 } 1168 1169 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr; 1170 1171 /* 1172 * XXX The only one ugly spot where we need to 1173 * XXX really change the sockets identity after 1174 * XXX it has entered the hashes. -DaveM 1175 * 1176 * Besides that, it does not check for connection 1177 * uniqueness. Wait for troubles. 1178 */ 1179 __sk_prot_rehash(sk); 1180 return 0; 1181 } 1182 1183 int inet_sk_rebuild_header(struct sock *sk) 1184 { 1185 struct inet_sock *inet = inet_sk(sk); 1186 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); 1187 __be32 daddr; 1188 struct ip_options_rcu *inet_opt; 1189 struct flowi4 *fl4; 1190 int err; 1191 1192 /* Route is OK, nothing to do. */ 1193 if (rt) 1194 return 0; 1195 1196 /* Reroute. */ 1197 rcu_read_lock(); 1198 inet_opt = rcu_dereference(inet->inet_opt); 1199 daddr = inet->inet_daddr; 1200 if (inet_opt && inet_opt->opt.srr) 1201 daddr = inet_opt->opt.faddr; 1202 rcu_read_unlock(); 1203 fl4 = &inet->cork.fl.u.ip4; 1204 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr, 1205 inet->inet_dport, inet->inet_sport, 1206 sk->sk_protocol, RT_CONN_FLAGS(sk), 1207 sk->sk_bound_dev_if); 1208 if (!IS_ERR(rt)) { 1209 err = 0; 1210 sk_setup_caps(sk, &rt->dst); 1211 } else { 1212 err = PTR_ERR(rt); 1213 1214 /* Routing failed... */ 1215 sk->sk_route_caps = 0; 1216 /* 1217 * Other protocols have to map its equivalent state to TCP_SYN_SENT. 1218 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme 1219 */ 1220 if (!sysctl_ip_dynaddr || 1221 sk->sk_state != TCP_SYN_SENT || 1222 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 1223 (err = inet_sk_reselect_saddr(sk)) != 0) 1224 sk->sk_err_soft = -err; 1225 } 1226 1227 return err; 1228 } 1229 EXPORT_SYMBOL(inet_sk_rebuild_header); 1230 1231 static int inet_gso_send_check(struct sk_buff *skb) 1232 { 1233 const struct net_protocol *ops; 1234 const struct iphdr *iph; 1235 int proto; 1236 int ihl; 1237 int err = -EINVAL; 1238 1239 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1240 goto out; 1241 1242 iph = ip_hdr(skb); 1243 ihl = iph->ihl * 4; 1244 if (ihl < sizeof(*iph)) 1245 goto out; 1246 1247 if (unlikely(!pskb_may_pull(skb, ihl))) 1248 goto out; 1249 1250 __skb_pull(skb, ihl); 1251 skb_reset_transport_header(skb); 1252 iph = ip_hdr(skb); 1253 proto = iph->protocol; 1254 err = -EPROTONOSUPPORT; 1255 1256 rcu_read_lock(); 1257 ops = rcu_dereference(inet_protos[proto]); 1258 if (likely(ops && ops->gso_send_check)) 1259 err = ops->gso_send_check(skb); 1260 rcu_read_unlock(); 1261 1262 out: 1263 return err; 1264 } 1265 1266 static struct sk_buff *inet_gso_segment(struct sk_buff *skb, 1267 netdev_features_t features) 1268 { 1269 struct sk_buff *segs = ERR_PTR(-EINVAL); 1270 const struct net_protocol *ops; 1271 struct iphdr *iph; 1272 int proto; 1273 int ihl; 1274 int id; 1275 unsigned int offset = 0; 1276 1277 if (!(features & NETIF_F_V4_CSUM)) 1278 features &= ~NETIF_F_SG; 1279 1280 if (unlikely(skb_shinfo(skb)->gso_type & 1281 ~(SKB_GSO_TCPV4 | 1282 SKB_GSO_UDP | 1283 SKB_GSO_DODGY | 1284 SKB_GSO_TCP_ECN | 1285 0))) 1286 goto out; 1287 1288 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1289 goto out; 1290 1291 iph = ip_hdr(skb); 1292 ihl = iph->ihl * 4; 1293 if (ihl < sizeof(*iph)) 1294 goto out; 1295 1296 if (unlikely(!pskb_may_pull(skb, ihl))) 1297 goto out; 1298 1299 __skb_pull(skb, ihl); 1300 skb_reset_transport_header(skb); 1301 iph = ip_hdr(skb); 1302 id = ntohs(iph->id); 1303 proto = iph->protocol; 1304 segs = ERR_PTR(-EPROTONOSUPPORT); 1305 1306 rcu_read_lock(); 1307 ops = rcu_dereference(inet_protos[proto]); 1308 if (likely(ops && ops->gso_segment)) 1309 segs = ops->gso_segment(skb, features); 1310 rcu_read_unlock(); 1311 1312 if (!segs || IS_ERR(segs)) 1313 goto out; 1314 1315 skb = segs; 1316 do { 1317 iph = ip_hdr(skb); 1318 if (proto == IPPROTO_UDP) { 1319 iph->id = htons(id); 1320 iph->frag_off = htons(offset >> 3); 1321 if (skb->next != NULL) 1322 iph->frag_off |= htons(IP_MF); 1323 offset += (skb->len - skb->mac_len - iph->ihl * 4); 1324 } else 1325 iph->id = htons(id++); 1326 iph->tot_len = htons(skb->len - skb->mac_len); 1327 iph->check = 0; 1328 iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl); 1329 } while ((skb = skb->next)); 1330 1331 out: 1332 return segs; 1333 } 1334 1335 static struct sk_buff **inet_gro_receive(struct sk_buff **head, 1336 struct sk_buff *skb) 1337 { 1338 const struct net_protocol *ops; 1339 struct sk_buff **pp = NULL; 1340 struct sk_buff *p; 1341 const struct iphdr *iph; 1342 unsigned int hlen; 1343 unsigned int off; 1344 unsigned int id; 1345 int flush = 1; 1346 int proto; 1347 1348 off = skb_gro_offset(skb); 1349 hlen = off + sizeof(*iph); 1350 iph = skb_gro_header_fast(skb, off); 1351 if (skb_gro_header_hard(skb, hlen)) { 1352 iph = skb_gro_header_slow(skb, hlen, off); 1353 if (unlikely(!iph)) 1354 goto out; 1355 } 1356 1357 proto = iph->protocol; 1358 1359 rcu_read_lock(); 1360 ops = rcu_dereference(inet_protos[proto]); 1361 if (!ops || !ops->gro_receive) 1362 goto out_unlock; 1363 1364 if (*(u8 *)iph != 0x45) 1365 goto out_unlock; 1366 1367 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) 1368 goto out_unlock; 1369 1370 id = ntohl(*(__be32 *)&iph->id); 1371 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id ^ IP_DF)); 1372 id >>= 16; 1373 1374 for (p = *head; p; p = p->next) { 1375 struct iphdr *iph2; 1376 1377 if (!NAPI_GRO_CB(p)->same_flow) 1378 continue; 1379 1380 iph2 = ip_hdr(p); 1381 1382 if ((iph->protocol ^ iph2->protocol) | 1383 (iph->tos ^ iph2->tos) | 1384 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) | 1385 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) { 1386 NAPI_GRO_CB(p)->same_flow = 0; 1387 continue; 1388 } 1389 1390 /* All fields must match except length and checksum. */ 1391 NAPI_GRO_CB(p)->flush |= 1392 (iph->ttl ^ iph2->ttl) | 1393 ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id); 1394 1395 NAPI_GRO_CB(p)->flush |= flush; 1396 } 1397 1398 NAPI_GRO_CB(skb)->flush |= flush; 1399 skb_gro_pull(skb, sizeof(*iph)); 1400 skb_set_transport_header(skb, skb_gro_offset(skb)); 1401 1402 pp = ops->gro_receive(head, skb); 1403 1404 out_unlock: 1405 rcu_read_unlock(); 1406 1407 out: 1408 NAPI_GRO_CB(skb)->flush |= flush; 1409 1410 return pp; 1411 } 1412 1413 static int inet_gro_complete(struct sk_buff *skb) 1414 { 1415 __be16 newlen = htons(skb->len - skb_network_offset(skb)); 1416 struct iphdr *iph = ip_hdr(skb); 1417 const struct net_protocol *ops; 1418 int proto = iph->protocol; 1419 int err = -ENOSYS; 1420 1421 csum_replace2(&iph->check, iph->tot_len, newlen); 1422 iph->tot_len = newlen; 1423 1424 rcu_read_lock(); 1425 ops = rcu_dereference(inet_protos[proto]); 1426 if (WARN_ON(!ops || !ops->gro_complete)) 1427 goto out_unlock; 1428 1429 err = ops->gro_complete(skb); 1430 1431 out_unlock: 1432 rcu_read_unlock(); 1433 1434 return err; 1435 } 1436 1437 int inet_ctl_sock_create(struct sock **sk, unsigned short family, 1438 unsigned short type, unsigned char protocol, 1439 struct net *net) 1440 { 1441 struct socket *sock; 1442 int rc = sock_create_kern(family, type, protocol, &sock); 1443 1444 if (rc == 0) { 1445 *sk = sock->sk; 1446 (*sk)->sk_allocation = GFP_ATOMIC; 1447 /* 1448 * Unhash it so that IP input processing does not even see it, 1449 * we do not wish this socket to see incoming packets. 1450 */ 1451 (*sk)->sk_prot->unhash(*sk); 1452 1453 sk_change_net(*sk, net); 1454 } 1455 return rc; 1456 } 1457 EXPORT_SYMBOL_GPL(inet_ctl_sock_create); 1458 1459 unsigned long snmp_fold_field(void __percpu *mib[], int offt) 1460 { 1461 unsigned long res = 0; 1462 int i, j; 1463 1464 for_each_possible_cpu(i) { 1465 for (j = 0; j < SNMP_ARRAY_SZ; j++) 1466 res += *(((unsigned long *) per_cpu_ptr(mib[j], i)) + offt); 1467 } 1468 return res; 1469 } 1470 EXPORT_SYMBOL_GPL(snmp_fold_field); 1471 1472 #if BITS_PER_LONG==32 1473 1474 u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t syncp_offset) 1475 { 1476 u64 res = 0; 1477 int cpu; 1478 1479 for_each_possible_cpu(cpu) { 1480 void *bhptr; 1481 struct u64_stats_sync *syncp; 1482 u64 v; 1483 unsigned int start; 1484 1485 bhptr = per_cpu_ptr(mib[0], cpu); 1486 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset); 1487 do { 1488 start = u64_stats_fetch_begin_bh(syncp); 1489 v = *(((u64 *) bhptr) + offt); 1490 } while (u64_stats_fetch_retry_bh(syncp, start)); 1491 1492 res += v; 1493 } 1494 return res; 1495 } 1496 EXPORT_SYMBOL_GPL(snmp_fold_field64); 1497 #endif 1498 1499 int snmp_mib_init(void __percpu *ptr[2], size_t mibsize, size_t align) 1500 { 1501 BUG_ON(ptr == NULL); 1502 ptr[0] = __alloc_percpu(mibsize, align); 1503 if (!ptr[0]) 1504 return -ENOMEM; 1505 #if SNMP_ARRAY_SZ == 2 1506 ptr[1] = __alloc_percpu(mibsize, align); 1507 if (!ptr[1]) { 1508 free_percpu(ptr[0]); 1509 ptr[0] = NULL; 1510 return -ENOMEM; 1511 } 1512 #endif 1513 return 0; 1514 } 1515 EXPORT_SYMBOL_GPL(snmp_mib_init); 1516 1517 void snmp_mib_free(void __percpu *ptr[SNMP_ARRAY_SZ]) 1518 { 1519 int i; 1520 1521 BUG_ON(ptr == NULL); 1522 for (i = 0; i < SNMP_ARRAY_SZ; i++) { 1523 free_percpu(ptr[i]); 1524 ptr[i] = NULL; 1525 } 1526 } 1527 EXPORT_SYMBOL_GPL(snmp_mib_free); 1528 1529 #ifdef CONFIG_IP_MULTICAST 1530 static const struct net_protocol igmp_protocol = { 1531 .handler = igmp_rcv, 1532 .netns_ok = 1, 1533 }; 1534 #endif 1535 1536 static const struct net_protocol tcp_protocol = { 1537 .early_demux = tcp_v4_early_demux, 1538 .handler = tcp_v4_rcv, 1539 .err_handler = tcp_v4_err, 1540 .gso_send_check = tcp_v4_gso_send_check, 1541 .gso_segment = tcp_tso_segment, 1542 .gro_receive = tcp4_gro_receive, 1543 .gro_complete = tcp4_gro_complete, 1544 .no_policy = 1, 1545 .netns_ok = 1, 1546 }; 1547 1548 static const struct net_protocol udp_protocol = { 1549 .handler = udp_rcv, 1550 .err_handler = udp_err, 1551 .gso_send_check = udp4_ufo_send_check, 1552 .gso_segment = udp4_ufo_fragment, 1553 .no_policy = 1, 1554 .netns_ok = 1, 1555 }; 1556 1557 static const struct net_protocol icmp_protocol = { 1558 .handler = icmp_rcv, 1559 .err_handler = ping_err, 1560 .no_policy = 1, 1561 .netns_ok = 1, 1562 }; 1563 1564 static __net_init int ipv4_mib_init_net(struct net *net) 1565 { 1566 if (snmp_mib_init((void __percpu **)net->mib.tcp_statistics, 1567 sizeof(struct tcp_mib), 1568 __alignof__(struct tcp_mib)) < 0) 1569 goto err_tcp_mib; 1570 if (snmp_mib_init((void __percpu **)net->mib.ip_statistics, 1571 sizeof(struct ipstats_mib), 1572 __alignof__(struct ipstats_mib)) < 0) 1573 goto err_ip_mib; 1574 if (snmp_mib_init((void __percpu **)net->mib.net_statistics, 1575 sizeof(struct linux_mib), 1576 __alignof__(struct linux_mib)) < 0) 1577 goto err_net_mib; 1578 if (snmp_mib_init((void __percpu **)net->mib.udp_statistics, 1579 sizeof(struct udp_mib), 1580 __alignof__(struct udp_mib)) < 0) 1581 goto err_udp_mib; 1582 if (snmp_mib_init((void __percpu **)net->mib.udplite_statistics, 1583 sizeof(struct udp_mib), 1584 __alignof__(struct udp_mib)) < 0) 1585 goto err_udplite_mib; 1586 if (snmp_mib_init((void __percpu **)net->mib.icmp_statistics, 1587 sizeof(struct icmp_mib), 1588 __alignof__(struct icmp_mib)) < 0) 1589 goto err_icmp_mib; 1590 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib), 1591 GFP_KERNEL); 1592 if (!net->mib.icmpmsg_statistics) 1593 goto err_icmpmsg_mib; 1594 1595 tcp_mib_init(net); 1596 return 0; 1597 1598 err_icmpmsg_mib: 1599 snmp_mib_free((void __percpu **)net->mib.icmp_statistics); 1600 err_icmp_mib: 1601 snmp_mib_free((void __percpu **)net->mib.udplite_statistics); 1602 err_udplite_mib: 1603 snmp_mib_free((void __percpu **)net->mib.udp_statistics); 1604 err_udp_mib: 1605 snmp_mib_free((void __percpu **)net->mib.net_statistics); 1606 err_net_mib: 1607 snmp_mib_free((void __percpu **)net->mib.ip_statistics); 1608 err_ip_mib: 1609 snmp_mib_free((void __percpu **)net->mib.tcp_statistics); 1610 err_tcp_mib: 1611 return -ENOMEM; 1612 } 1613 1614 static __net_exit void ipv4_mib_exit_net(struct net *net) 1615 { 1616 kfree(net->mib.icmpmsg_statistics); 1617 snmp_mib_free((void __percpu **)net->mib.icmp_statistics); 1618 snmp_mib_free((void __percpu **)net->mib.udplite_statistics); 1619 snmp_mib_free((void __percpu **)net->mib.udp_statistics); 1620 snmp_mib_free((void __percpu **)net->mib.net_statistics); 1621 snmp_mib_free((void __percpu **)net->mib.ip_statistics); 1622 snmp_mib_free((void __percpu **)net->mib.tcp_statistics); 1623 } 1624 1625 static __net_initdata struct pernet_operations ipv4_mib_ops = { 1626 .init = ipv4_mib_init_net, 1627 .exit = ipv4_mib_exit_net, 1628 }; 1629 1630 static int __init init_ipv4_mibs(void) 1631 { 1632 return register_pernet_subsys(&ipv4_mib_ops); 1633 } 1634 1635 static int ipv4_proc_init(void); 1636 1637 /* 1638 * IP protocol layer initialiser 1639 */ 1640 1641 static struct packet_type ip_packet_type __read_mostly = { 1642 .type = cpu_to_be16(ETH_P_IP), 1643 .func = ip_rcv, 1644 .gso_send_check = inet_gso_send_check, 1645 .gso_segment = inet_gso_segment, 1646 .gro_receive = inet_gro_receive, 1647 .gro_complete = inet_gro_complete, 1648 }; 1649 1650 static int __init inet_init(void) 1651 { 1652 struct sk_buff *dummy_skb; 1653 struct inet_protosw *q; 1654 struct list_head *r; 1655 int rc = -EINVAL; 1656 1657 BUILD_BUG_ON(sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb)); 1658 1659 sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL); 1660 if (!sysctl_local_reserved_ports) 1661 goto out; 1662 1663 rc = proto_register(&tcp_prot, 1); 1664 if (rc) 1665 goto out_free_reserved_ports; 1666 1667 rc = proto_register(&udp_prot, 1); 1668 if (rc) 1669 goto out_unregister_tcp_proto; 1670 1671 rc = proto_register(&raw_prot, 1); 1672 if (rc) 1673 goto out_unregister_udp_proto; 1674 1675 rc = proto_register(&ping_prot, 1); 1676 if (rc) 1677 goto out_unregister_raw_proto; 1678 1679 /* 1680 * Tell SOCKET that we are alive... 1681 */ 1682 1683 (void)sock_register(&inet_family_ops); 1684 1685 #ifdef CONFIG_SYSCTL 1686 ip_static_sysctl_init(); 1687 #endif 1688 1689 tcp_prot.sysctl_mem = init_net.ipv4.sysctl_tcp_mem; 1690 1691 /* 1692 * Add all the base protocols. 1693 */ 1694 1695 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 1696 pr_crit("%s: Cannot add ICMP protocol\n", __func__); 1697 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) 1698 pr_crit("%s: Cannot add UDP protocol\n", __func__); 1699 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) 1700 pr_crit("%s: Cannot add TCP protocol\n", __func__); 1701 #ifdef CONFIG_IP_MULTICAST 1702 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 1703 pr_crit("%s: Cannot add IGMP protocol\n", __func__); 1704 #endif 1705 1706 /* Register the socket-side information for inet_create. */ 1707 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 1708 INIT_LIST_HEAD(r); 1709 1710 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 1711 inet_register_protosw(q); 1712 1713 /* 1714 * Set the ARP module up 1715 */ 1716 1717 arp_init(); 1718 1719 /* 1720 * Set the IP module up 1721 */ 1722 1723 ip_init(); 1724 1725 tcp_v4_init(); 1726 1727 /* Setup TCP slab cache for open requests. */ 1728 tcp_init(); 1729 1730 /* Setup UDP memory threshold */ 1731 udp_init(); 1732 1733 /* Add UDP-Lite (RFC 3828) */ 1734 udplite4_register(); 1735 1736 ping_init(); 1737 1738 /* 1739 * Set the ICMP layer up 1740 */ 1741 1742 if (icmp_init() < 0) 1743 panic("Failed to create the ICMP control socket.\n"); 1744 1745 /* 1746 * Initialise the multicast router 1747 */ 1748 #if defined(CONFIG_IP_MROUTE) 1749 if (ip_mr_init()) 1750 pr_crit("%s: Cannot init ipv4 mroute\n", __func__); 1751 #endif 1752 /* 1753 * Initialise per-cpu ipv4 mibs 1754 */ 1755 1756 if (init_ipv4_mibs()) 1757 pr_crit("%s: Cannot init ipv4 mibs\n", __func__); 1758 1759 ipv4_proc_init(); 1760 1761 ipfrag_init(); 1762 1763 dev_add_pack(&ip_packet_type); 1764 1765 rc = 0; 1766 out: 1767 return rc; 1768 out_unregister_raw_proto: 1769 proto_unregister(&raw_prot); 1770 out_unregister_udp_proto: 1771 proto_unregister(&udp_prot); 1772 out_unregister_tcp_proto: 1773 proto_unregister(&tcp_prot); 1774 out_free_reserved_ports: 1775 kfree(sysctl_local_reserved_ports); 1776 goto out; 1777 } 1778 1779 fs_initcall(inet_init); 1780 1781 /* ------------------------------------------------------------------------ */ 1782 1783 #ifdef CONFIG_PROC_FS 1784 static int __init ipv4_proc_init(void) 1785 { 1786 int rc = 0; 1787 1788 if (raw_proc_init()) 1789 goto out_raw; 1790 if (tcp4_proc_init()) 1791 goto out_tcp; 1792 if (udp4_proc_init()) 1793 goto out_udp; 1794 if (ping_proc_init()) 1795 goto out_ping; 1796 if (ip_misc_proc_init()) 1797 goto out_misc; 1798 out: 1799 return rc; 1800 out_misc: 1801 ping_proc_exit(); 1802 out_ping: 1803 udp4_proc_exit(); 1804 out_udp: 1805 tcp4_proc_exit(); 1806 out_tcp: 1807 raw_proc_exit(); 1808 out_raw: 1809 rc = -ENOMEM; 1810 goto out; 1811 } 1812 1813 #else /* CONFIG_PROC_FS */ 1814 static int __init ipv4_proc_init(void) 1815 { 1816 return 0; 1817 } 1818 #endif /* CONFIG_PROC_FS */ 1819 1820 MODULE_ALIAS_NETPROTO(PF_INET); 1821 1822