1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * INET An implementation of the TCP/IP protocol suite for the LINUX 4 * operating system. INET is implemented using the BSD Socket 5 * interface as the means of communication with the user level. 6 * 7 * PF_INET protocol family socket handler. 8 * 9 * Authors: Ross Biro 10 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 11 * Florian La Roche, <flla@stud.uni-sb.de> 12 * Alan Cox, <A.Cox@swansea.ac.uk> 13 * 14 * Changes (see also sock.c) 15 * 16 * piggy, 17 * Karl Knutson : Socket protocol table 18 * A.N.Kuznetsov : Socket death error in accept(). 19 * John Richardson : Fix non blocking error in connect() 20 * so sockets that fail to connect 21 * don't return -EINPROGRESS. 22 * Alan Cox : Asynchronous I/O support 23 * Alan Cox : Keep correct socket pointer on sock 24 * structures 25 * when accept() ed 26 * Alan Cox : Semantics of SO_LINGER aren't state 27 * moved to close when you look carefully. 28 * With this fixed and the accept bug fixed 29 * some RPC stuff seems happier. 30 * Niibe Yutaka : 4.4BSD style write async I/O 31 * Alan Cox, 32 * Tony Gale : Fixed reuse semantics. 33 * Alan Cox : bind() shouldn't abort existing but dead 34 * sockets. Stops FTP netin:.. I hope. 35 * Alan Cox : bind() works correctly for RAW sockets. 36 * Note that FreeBSD at least was broken 37 * in this respect so be careful with 38 * compatibility tests... 39 * Alan Cox : routing cache support 40 * Alan Cox : memzero the socket structure for 41 * compactness. 42 * Matt Day : nonblock connect error handler 43 * Alan Cox : Allow large numbers of pending sockets 44 * (eg for big web sites), but only if 45 * specifically application requested. 46 * Alan Cox : New buffering throughout IP. Used 47 * dumbly. 48 * Alan Cox : New buffering now used smartly. 49 * Alan Cox : BSD rather than common sense 50 * interpretation of listen. 51 * Germano Caronni : Assorted small races. 52 * Alan Cox : sendmsg/recvmsg basic support. 53 * Alan Cox : Only sendmsg/recvmsg now supported. 54 * Alan Cox : Locked down bind (see security list). 55 * Alan Cox : Loosened bind a little. 56 * Mike McLagan : ADD/DEL DLCI Ioctls 57 * Willy Konynenberg : Transparent proxying support. 58 * David S. Miller : New socket lookup architecture. 59 * Some other random speedups. 60 * Cyrus Durgin : Cleaned up file for kmod hacks. 61 * Andi Kleen : Fix inet_stream_connect TCP race. 62 */ 63 64 #define pr_fmt(fmt) "IPv4: " fmt 65 66 #include <linux/err.h> 67 #include <linux/errno.h> 68 #include <linux/types.h> 69 #include <linux/socket.h> 70 #include <linux/in.h> 71 #include <linux/kernel.h> 72 #include <linux/kmod.h> 73 #include <linux/sched.h> 74 #include <linux/timer.h> 75 #include <linux/string.h> 76 #include <linux/sockios.h> 77 #include <linux/net.h> 78 #include <linux/capability.h> 79 #include <linux/fcntl.h> 80 #include <linux/mm.h> 81 #include <linux/interrupt.h> 82 #include <linux/stat.h> 83 #include <linux/init.h> 84 #include <linux/poll.h> 85 #include <linux/netfilter_ipv4.h> 86 #include <linux/random.h> 87 #include <linux/slab.h> 88 89 #include <linux/uaccess.h> 90 91 #include <linux/inet.h> 92 #include <linux/igmp.h> 93 #include <linux/inetdevice.h> 94 #include <linux/netdevice.h> 95 #include <net/checksum.h> 96 #include <net/ip.h> 97 #include <net/protocol.h> 98 #include <net/arp.h> 99 #include <net/route.h> 100 #include <net/ip_fib.h> 101 #include <net/inet_connection_sock.h> 102 #include <net/tcp.h> 103 #include <net/udp.h> 104 #include <net/udplite.h> 105 #include <net/ping.h> 106 #include <linux/skbuff.h> 107 #include <net/sock.h> 108 #include <net/raw.h> 109 #include <net/icmp.h> 110 #include <net/inet_common.h> 111 #include <net/ip_tunnels.h> 112 #include <net/xfrm.h> 113 #include <net/net_namespace.h> 114 #include <net/secure_seq.h> 115 #ifdef CONFIG_IP_MROUTE 116 #include <linux/mroute.h> 117 #endif 118 #include <net/l3mdev.h> 119 #include <net/compat.h> 120 121 #include <trace/events/sock.h> 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 if (sk->sk_rx_skb_cache) { 137 __kfree_skb(sk->sk_rx_skb_cache); 138 sk->sk_rx_skb_cache = NULL; 139 } 140 __skb_queue_purge(&sk->sk_error_queue); 141 142 sk_mem_reclaim(sk); 143 144 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) { 145 pr_err("Attempt to release TCP socket in state %d %p\n", 146 sk->sk_state, sk); 147 return; 148 } 149 if (!sock_flag(sk, SOCK_DEAD)) { 150 pr_err("Attempt to release alive inet socket %p\n", sk); 151 return; 152 } 153 154 WARN_ON(atomic_read(&sk->sk_rmem_alloc)); 155 WARN_ON(refcount_read(&sk->sk_wmem_alloc)); 156 WARN_ON(sk->sk_wmem_queued); 157 WARN_ON(sk->sk_forward_alloc); 158 159 kfree(rcu_dereference_protected(inet->inet_opt, 1)); 160 dst_release(rcu_dereference_protected(sk->sk_dst_cache, 1)); 161 dst_release(sk->sk_rx_dst); 162 sk_refcnt_debug_dec(sk); 163 } 164 EXPORT_SYMBOL(inet_sock_destruct); 165 166 /* 167 * The routines beyond this point handle the behaviour of an AF_INET 168 * socket object. Mostly it punts to the subprotocols of IP to do 169 * the work. 170 */ 171 172 /* 173 * Automatically bind an unbound socket. 174 */ 175 176 static int inet_autobind(struct sock *sk) 177 { 178 struct inet_sock *inet; 179 /* We may need to bind the socket. */ 180 lock_sock(sk); 181 inet = inet_sk(sk); 182 if (!inet->inet_num) { 183 if (sk->sk_prot->get_port(sk, 0)) { 184 release_sock(sk); 185 return -EAGAIN; 186 } 187 inet->inet_sport = htons(inet->inet_num); 188 } 189 release_sock(sk); 190 return 0; 191 } 192 193 /* 194 * Move a socket into listening state. 195 */ 196 int inet_listen(struct socket *sock, int backlog) 197 { 198 struct sock *sk = sock->sk; 199 unsigned char old_state; 200 int err, tcp_fastopen; 201 202 lock_sock(sk); 203 204 err = -EINVAL; 205 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM) 206 goto out; 207 208 old_state = sk->sk_state; 209 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN))) 210 goto out; 211 212 WRITE_ONCE(sk->sk_max_ack_backlog, backlog); 213 /* Really, if the socket is already in listen state 214 * we can only allow the backlog to be adjusted. 215 */ 216 if (old_state != TCP_LISTEN) { 217 /* Enable TFO w/o requiring TCP_FASTOPEN socket option. 218 * Note that only TCP sockets (SOCK_STREAM) will reach here. 219 * Also fastopen backlog may already been set via the option 220 * because the socket was in TCP_LISTEN state previously but 221 * was shutdown() rather than close(). 222 */ 223 tcp_fastopen = sock_net(sk)->ipv4.sysctl_tcp_fastopen; 224 if ((tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) && 225 (tcp_fastopen & TFO_SERVER_ENABLE) && 226 !inet_csk(sk)->icsk_accept_queue.fastopenq.max_qlen) { 227 fastopen_queue_tune(sk, backlog); 228 tcp_fastopen_init_key_once(sock_net(sk)); 229 } 230 231 err = inet_csk_listen_start(sk, backlog); 232 if (err) 233 goto out; 234 tcp_call_bpf(sk, BPF_SOCK_OPS_TCP_LISTEN_CB, 0, NULL); 235 } 236 err = 0; 237 238 out: 239 release_sock(sk); 240 return err; 241 } 242 EXPORT_SYMBOL(inet_listen); 243 244 /* 245 * Create an inet socket. 246 */ 247 248 static int inet_create(struct net *net, struct socket *sock, int protocol, 249 int kern) 250 { 251 struct sock *sk; 252 struct inet_protosw *answer; 253 struct inet_sock *inet; 254 struct proto *answer_prot; 255 unsigned char answer_flags; 256 int try_loading_module = 0; 257 int err; 258 259 if (protocol < 0 || protocol >= IPPROTO_MAX) 260 return -EINVAL; 261 262 sock->state = SS_UNCONNECTED; 263 264 /* Look for the requested type/protocol pair. */ 265 lookup_protocol: 266 err = -ESOCKTNOSUPPORT; 267 rcu_read_lock(); 268 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) { 269 270 err = 0; 271 /* Check the non-wild match. */ 272 if (protocol == answer->protocol) { 273 if (protocol != IPPROTO_IP) 274 break; 275 } else { 276 /* Check for the two wild cases. */ 277 if (IPPROTO_IP == protocol) { 278 protocol = answer->protocol; 279 break; 280 } 281 if (IPPROTO_IP == answer->protocol) 282 break; 283 } 284 err = -EPROTONOSUPPORT; 285 } 286 287 if (unlikely(err)) { 288 if (try_loading_module < 2) { 289 rcu_read_unlock(); 290 /* 291 * Be more specific, e.g. net-pf-2-proto-132-type-1 292 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) 293 */ 294 if (++try_loading_module == 1) 295 request_module("net-pf-%d-proto-%d-type-%d", 296 PF_INET, protocol, sock->type); 297 /* 298 * Fall back to generic, e.g. net-pf-2-proto-132 299 * (net-pf-PF_INET-proto-IPPROTO_SCTP) 300 */ 301 else 302 request_module("net-pf-%d-proto-%d", 303 PF_INET, protocol); 304 goto lookup_protocol; 305 } else 306 goto out_rcu_unlock; 307 } 308 309 err = -EPERM; 310 if (sock->type == SOCK_RAW && !kern && 311 !ns_capable(net->user_ns, CAP_NET_RAW)) 312 goto out_rcu_unlock; 313 314 sock->ops = answer->ops; 315 answer_prot = answer->prot; 316 answer_flags = answer->flags; 317 rcu_read_unlock(); 318 319 WARN_ON(!answer_prot->slab); 320 321 err = -ENOBUFS; 322 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot, kern); 323 if (!sk) 324 goto out; 325 326 err = 0; 327 if (INET_PROTOSW_REUSE & answer_flags) 328 sk->sk_reuse = SK_CAN_REUSE; 329 330 inet = inet_sk(sk); 331 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 332 333 inet->nodefrag = 0; 334 335 if (SOCK_RAW == sock->type) { 336 inet->inet_num = protocol; 337 if (IPPROTO_RAW == protocol) 338 inet->hdrincl = 1; 339 } 340 341 if (net->ipv4.sysctl_ip_no_pmtu_disc) 342 inet->pmtudisc = IP_PMTUDISC_DONT; 343 else 344 inet->pmtudisc = IP_PMTUDISC_WANT; 345 346 inet->inet_id = 0; 347 348 sock_init_data(sock, sk); 349 350 sk->sk_destruct = inet_sock_destruct; 351 sk->sk_protocol = protocol; 352 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 353 354 inet->uc_ttl = -1; 355 inet->mc_loop = 1; 356 inet->mc_ttl = 1; 357 inet->mc_all = 1; 358 inet->mc_index = 0; 359 inet->mc_list = NULL; 360 inet->rcv_tos = 0; 361 362 sk_refcnt_debug_inc(sk); 363 364 if (inet->inet_num) { 365 /* It assumes that any protocol which allows 366 * the user to assign a number at socket 367 * creation time automatically 368 * shares. 369 */ 370 inet->inet_sport = htons(inet->inet_num); 371 /* Add to protocol hash chains. */ 372 err = sk->sk_prot->hash(sk); 373 if (err) { 374 sk_common_release(sk); 375 goto out; 376 } 377 } 378 379 if (sk->sk_prot->init) { 380 err = sk->sk_prot->init(sk); 381 if (err) { 382 sk_common_release(sk); 383 goto out; 384 } 385 } 386 387 if (!kern) { 388 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk); 389 if (err) { 390 sk_common_release(sk); 391 goto out; 392 } 393 } 394 out: 395 return err; 396 out_rcu_unlock: 397 rcu_read_unlock(); 398 goto out; 399 } 400 401 402 /* 403 * The peer socket should always be NULL (or else). When we call this 404 * function we are destroying the object and from then on nobody 405 * should refer to it. 406 */ 407 int inet_release(struct socket *sock) 408 { 409 struct sock *sk = sock->sk; 410 411 if (sk) { 412 long timeout; 413 414 /* Applications forget to leave groups before exiting */ 415 ip_mc_drop_socket(sk); 416 417 /* If linger is set, we don't return until the close 418 * is complete. Otherwise we return immediately. The 419 * actually closing is done the same either way. 420 * 421 * If the close is due to the process exiting, we never 422 * linger.. 423 */ 424 timeout = 0; 425 if (sock_flag(sk, SOCK_LINGER) && 426 !(current->flags & PF_EXITING)) 427 timeout = sk->sk_lingertime; 428 sk->sk_prot->close(sk, timeout); 429 sock->sk = NULL; 430 } 431 return 0; 432 } 433 EXPORT_SYMBOL(inet_release); 434 435 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 436 { 437 struct sock *sk = sock->sk; 438 int err; 439 440 /* If the socket has its own bind function then use it. (RAW) */ 441 if (sk->sk_prot->bind) { 442 return sk->sk_prot->bind(sk, uaddr, addr_len); 443 } 444 if (addr_len < sizeof(struct sockaddr_in)) 445 return -EINVAL; 446 447 /* BPF prog is run before any checks are done so that if the prog 448 * changes context in a wrong way it will be caught. 449 */ 450 err = BPF_CGROUP_RUN_PROG_INET4_BIND(sk, uaddr); 451 if (err) 452 return err; 453 454 return __inet_bind(sk, uaddr, addr_len, BIND_WITH_LOCK); 455 } 456 EXPORT_SYMBOL(inet_bind); 457 458 int __inet_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len, 459 u32 flags) 460 { 461 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 462 struct inet_sock *inet = inet_sk(sk); 463 struct net *net = sock_net(sk); 464 unsigned short snum; 465 int chk_addr_ret; 466 u32 tb_id = RT_TABLE_LOCAL; 467 int err; 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 tb_id = l3mdev_fib_table_by_index(net, sk->sk_bound_dev_if) ? : tb_id; 480 chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id); 481 482 /* Not specified by any standard per-se, however it breaks too 483 * many applications when removed. It is unfortunate since 484 * allowing applications to make a non-local bind solves 485 * several problems with systems using dynamic addressing. 486 * (ie. your servers still start up even if your ISDN link 487 * is temporarily down) 488 */ 489 err = -EADDRNOTAVAIL; 490 if (!inet_can_nonlocal_bind(net, inet) && 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 && inet_port_requires_bind_service(net, snum) && 500 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 501 goto out; 502 503 /* We keep a pair of addresses. rcv_saddr is the one 504 * used by hash lookups, and saddr is used for transmit. 505 * 506 * In the BSD API these are the same except where it 507 * would be illegal to use them (multicast/broadcast) in 508 * which case the sending device address is used. 509 */ 510 if (flags & BIND_WITH_LOCK) 511 lock_sock(sk); 512 513 /* Check these errors (active socket, double bind). */ 514 err = -EINVAL; 515 if (sk->sk_state != TCP_CLOSE || inet->inet_num) 516 goto out_release_sock; 517 518 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 519 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 520 inet->inet_saddr = 0; /* Use device */ 521 522 /* Make sure we are allowed to bind here. */ 523 if (snum || !(inet->bind_address_no_port || 524 (flags & BIND_FORCE_ADDRESS_NO_PORT))) { 525 if (sk->sk_prot->get_port(sk, snum)) { 526 inet->inet_saddr = inet->inet_rcv_saddr = 0; 527 err = -EADDRINUSE; 528 goto out_release_sock; 529 } 530 if (!(flags & BIND_FROM_BPF)) { 531 err = BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk); 532 if (err) { 533 inet->inet_saddr = inet->inet_rcv_saddr = 0; 534 goto out_release_sock; 535 } 536 } 537 } 538 539 if (inet->inet_rcv_saddr) 540 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 541 if (snum) 542 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 543 inet->inet_sport = htons(inet->inet_num); 544 inet->inet_daddr = 0; 545 inet->inet_dport = 0; 546 sk_dst_reset(sk); 547 err = 0; 548 out_release_sock: 549 if (flags & BIND_WITH_LOCK) 550 release_sock(sk); 551 out: 552 return err; 553 } 554 555 int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr, 556 int addr_len, int flags) 557 { 558 struct sock *sk = sock->sk; 559 int err; 560 561 if (addr_len < sizeof(uaddr->sa_family)) 562 return -EINVAL; 563 if (uaddr->sa_family == AF_UNSPEC) 564 return sk->sk_prot->disconnect(sk, flags); 565 566 if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) { 567 err = sk->sk_prot->pre_connect(sk, uaddr, addr_len); 568 if (err) 569 return err; 570 } 571 572 if (!inet_sk(sk)->inet_num && inet_autobind(sk)) 573 return -EAGAIN; 574 return sk->sk_prot->connect(sk, uaddr, addr_len); 575 } 576 EXPORT_SYMBOL(inet_dgram_connect); 577 578 static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias) 579 { 580 DEFINE_WAIT_FUNC(wait, woken_wake_function); 581 582 add_wait_queue(sk_sleep(sk), &wait); 583 sk->sk_write_pending += writebias; 584 585 /* Basic assumption: if someone sets sk->sk_err, he _must_ 586 * change state of the socket from TCP_SYN_*. 587 * Connect() does not allow to get error notifications 588 * without closing the socket. 589 */ 590 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 591 release_sock(sk); 592 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo); 593 lock_sock(sk); 594 if (signal_pending(current) || !timeo) 595 break; 596 } 597 remove_wait_queue(sk_sleep(sk), &wait); 598 sk->sk_write_pending -= writebias; 599 return timeo; 600 } 601 602 /* 603 * Connect to a remote host. There is regrettably still a little 604 * TCP 'magic' in here. 605 */ 606 int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 607 int addr_len, int flags, int is_sendmsg) 608 { 609 struct sock *sk = sock->sk; 610 int err; 611 long timeo; 612 613 /* 614 * uaddr can be NULL and addr_len can be 0 if: 615 * sk is a TCP fastopen active socket and 616 * TCP_FASTOPEN_CONNECT sockopt is set and 617 * we already have a valid cookie for this socket. 618 * In this case, user can call write() after connect(). 619 * write() will invoke tcp_sendmsg_fastopen() which calls 620 * __inet_stream_connect(). 621 */ 622 if (uaddr) { 623 if (addr_len < sizeof(uaddr->sa_family)) 624 return -EINVAL; 625 626 if (uaddr->sa_family == AF_UNSPEC) { 627 err = sk->sk_prot->disconnect(sk, flags); 628 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 629 goto out; 630 } 631 } 632 633 switch (sock->state) { 634 default: 635 err = -EINVAL; 636 goto out; 637 case SS_CONNECTED: 638 err = -EISCONN; 639 goto out; 640 case SS_CONNECTING: 641 if (inet_sk(sk)->defer_connect) 642 err = is_sendmsg ? -EINPROGRESS : -EISCONN; 643 else 644 err = -EALREADY; 645 /* Fall out of switch with err, set for this state */ 646 break; 647 case SS_UNCONNECTED: 648 err = -EISCONN; 649 if (sk->sk_state != TCP_CLOSE) 650 goto out; 651 652 if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) { 653 err = sk->sk_prot->pre_connect(sk, uaddr, addr_len); 654 if (err) 655 goto out; 656 } 657 658 err = sk->sk_prot->connect(sk, uaddr, addr_len); 659 if (err < 0) 660 goto out; 661 662 sock->state = SS_CONNECTING; 663 664 if (!err && inet_sk(sk)->defer_connect) 665 goto out; 666 667 /* Just entered SS_CONNECTING state; the only 668 * difference is that return value in non-blocking 669 * case is EINPROGRESS, rather than EALREADY. 670 */ 671 err = -EINPROGRESS; 672 break; 673 } 674 675 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 676 677 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 678 int writebias = (sk->sk_protocol == IPPROTO_TCP) && 679 tcp_sk(sk)->fastopen_req && 680 tcp_sk(sk)->fastopen_req->data ? 1 : 0; 681 682 /* Error code is set above */ 683 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias)) 684 goto out; 685 686 err = sock_intr_errno(timeo); 687 if (signal_pending(current)) 688 goto out; 689 } 690 691 /* Connection was closed by RST, timeout, ICMP error 692 * or another process disconnected us. 693 */ 694 if (sk->sk_state == TCP_CLOSE) 695 goto sock_error; 696 697 /* sk->sk_err may be not zero now, if RECVERR was ordered by user 698 * and error was received after socket entered established state. 699 * Hence, it is handled normally after connect() return successfully. 700 */ 701 702 sock->state = SS_CONNECTED; 703 err = 0; 704 out: 705 return err; 706 707 sock_error: 708 err = sock_error(sk) ? : -ECONNABORTED; 709 sock->state = SS_UNCONNECTED; 710 if (sk->sk_prot->disconnect(sk, flags)) 711 sock->state = SS_DISCONNECTING; 712 goto out; 713 } 714 EXPORT_SYMBOL(__inet_stream_connect); 715 716 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 717 int addr_len, int flags) 718 { 719 int err; 720 721 lock_sock(sock->sk); 722 err = __inet_stream_connect(sock, uaddr, addr_len, flags, 0); 723 release_sock(sock->sk); 724 return err; 725 } 726 EXPORT_SYMBOL(inet_stream_connect); 727 728 /* 729 * Accept a pending connection. The TCP layer now gives BSD semantics. 730 */ 731 732 int inet_accept(struct socket *sock, struct socket *newsock, int flags, 733 bool kern) 734 { 735 struct sock *sk1 = sock->sk; 736 int err = -EINVAL; 737 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err, kern); 738 739 if (!sk2) 740 goto do_err; 741 742 lock_sock(sk2); 743 744 sock_rps_record_flow(sk2); 745 WARN_ON(!((1 << sk2->sk_state) & 746 (TCPF_ESTABLISHED | TCPF_SYN_RECV | 747 TCPF_CLOSE_WAIT | TCPF_CLOSE))); 748 749 sock_graft(sk2, newsock); 750 751 newsock->state = SS_CONNECTED; 752 err = 0; 753 release_sock(sk2); 754 do_err: 755 return err; 756 } 757 EXPORT_SYMBOL(inet_accept); 758 759 /* 760 * This does both peername and sockname. 761 */ 762 int inet_getname(struct socket *sock, struct sockaddr *uaddr, 763 int peer) 764 { 765 struct sock *sk = sock->sk; 766 struct inet_sock *inet = inet_sk(sk); 767 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr); 768 769 sin->sin_family = AF_INET; 770 if (peer) { 771 if (!inet->inet_dport || 772 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 773 peer == 1)) 774 return -ENOTCONN; 775 sin->sin_port = inet->inet_dport; 776 sin->sin_addr.s_addr = inet->inet_daddr; 777 } else { 778 __be32 addr = inet->inet_rcv_saddr; 779 if (!addr) 780 addr = inet->inet_saddr; 781 sin->sin_port = inet->inet_sport; 782 sin->sin_addr.s_addr = addr; 783 } 784 if (cgroup_bpf_enabled) 785 BPF_CGROUP_RUN_SA_PROG_LOCK(sk, (struct sockaddr *)sin, 786 peer ? BPF_CGROUP_INET4_GETPEERNAME : 787 BPF_CGROUP_INET4_GETSOCKNAME, 788 NULL); 789 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 790 return sizeof(*sin); 791 } 792 EXPORT_SYMBOL(inet_getname); 793 794 int inet_send_prepare(struct sock *sk) 795 { 796 sock_rps_record_flow(sk); 797 798 /* We may need to bind the socket. */ 799 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 800 inet_autobind(sk)) 801 return -EAGAIN; 802 803 return 0; 804 } 805 EXPORT_SYMBOL_GPL(inet_send_prepare); 806 807 int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) 808 { 809 struct sock *sk = sock->sk; 810 811 if (unlikely(inet_send_prepare(sk))) 812 return -EAGAIN; 813 814 return INDIRECT_CALL_2(sk->sk_prot->sendmsg, tcp_sendmsg, udp_sendmsg, 815 sk, msg, size); 816 } 817 EXPORT_SYMBOL(inet_sendmsg); 818 819 ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, 820 size_t size, int flags) 821 { 822 struct sock *sk = sock->sk; 823 824 if (unlikely(inet_send_prepare(sk))) 825 return -EAGAIN; 826 827 if (sk->sk_prot->sendpage) 828 return sk->sk_prot->sendpage(sk, page, offset, size, flags); 829 return sock_no_sendpage(sock, page, offset, size, flags); 830 } 831 EXPORT_SYMBOL(inet_sendpage); 832 833 INDIRECT_CALLABLE_DECLARE(int udp_recvmsg(struct sock *, struct msghdr *, 834 size_t, int, int, int *)); 835 int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 836 int flags) 837 { 838 struct sock *sk = sock->sk; 839 int addr_len = 0; 840 int err; 841 842 if (likely(!(flags & MSG_ERRQUEUE))) 843 sock_rps_record_flow(sk); 844 845 err = INDIRECT_CALL_2(sk->sk_prot->recvmsg, tcp_recvmsg, udp_recvmsg, 846 sk, msg, size, flags & MSG_DONTWAIT, 847 flags & ~MSG_DONTWAIT, &addr_len); 848 if (err >= 0) 849 msg->msg_namelen = addr_len; 850 return err; 851 } 852 EXPORT_SYMBOL(inet_recvmsg); 853 854 int inet_shutdown(struct socket *sock, int how) 855 { 856 struct sock *sk = sock->sk; 857 int err = 0; 858 859 /* This should really check to make sure 860 * the socket is a TCP socket. (WHY AC...) 861 */ 862 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and 863 1->2 bit 2 snds. 864 2->3 */ 865 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ 866 return -EINVAL; 867 868 lock_sock(sk); 869 if (sock->state == SS_CONNECTING) { 870 if ((1 << sk->sk_state) & 871 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) 872 sock->state = SS_DISCONNECTING; 873 else 874 sock->state = SS_CONNECTED; 875 } 876 877 switch (sk->sk_state) { 878 case TCP_CLOSE: 879 err = -ENOTCONN; 880 /* Hack to wake up other listeners, who can poll for 881 EPOLLHUP, even on eg. unconnected UDP sockets -- RR */ 882 fallthrough; 883 default: 884 sk->sk_shutdown |= how; 885 if (sk->sk_prot->shutdown) 886 sk->sk_prot->shutdown(sk, how); 887 break; 888 889 /* Remaining two branches are temporary solution for missing 890 * close() in multithreaded environment. It is _not_ a good idea, 891 * but we have no choice until close() is repaired at VFS level. 892 */ 893 case TCP_LISTEN: 894 if (!(how & RCV_SHUTDOWN)) 895 break; 896 fallthrough; 897 case TCP_SYN_SENT: 898 err = sk->sk_prot->disconnect(sk, O_NONBLOCK); 899 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 900 break; 901 } 902 903 /* Wake up anyone sleeping in poll. */ 904 sk->sk_state_change(sk); 905 release_sock(sk); 906 return err; 907 } 908 EXPORT_SYMBOL(inet_shutdown); 909 910 /* 911 * ioctl() calls you can issue on an INET socket. Most of these are 912 * device configuration and stuff and very rarely used. Some ioctls 913 * pass on to the socket itself. 914 * 915 * NOTE: I like the idea of a module for the config stuff. ie ifconfig 916 * loads the devconfigure module does its configuring and unloads it. 917 * There's a good 20K of config code hanging around the kernel. 918 */ 919 920 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 921 { 922 struct sock *sk = sock->sk; 923 int err = 0; 924 struct net *net = sock_net(sk); 925 void __user *p = (void __user *)arg; 926 struct ifreq ifr; 927 struct rtentry rt; 928 929 switch (cmd) { 930 case SIOCADDRT: 931 case SIOCDELRT: 932 if (copy_from_user(&rt, p, sizeof(struct rtentry))) 933 return -EFAULT; 934 err = ip_rt_ioctl(net, cmd, &rt); 935 break; 936 case SIOCRTMSG: 937 err = -EINVAL; 938 break; 939 case SIOCDARP: 940 case SIOCGARP: 941 case SIOCSARP: 942 err = arp_ioctl(net, cmd, (void __user *)arg); 943 break; 944 case SIOCGIFADDR: 945 case SIOCGIFBRDADDR: 946 case SIOCGIFNETMASK: 947 case SIOCGIFDSTADDR: 948 case SIOCGIFPFLAGS: 949 if (copy_from_user(&ifr, p, sizeof(struct ifreq))) 950 return -EFAULT; 951 err = devinet_ioctl(net, cmd, &ifr); 952 if (!err && copy_to_user(p, &ifr, sizeof(struct ifreq))) 953 err = -EFAULT; 954 break; 955 956 case SIOCSIFADDR: 957 case SIOCSIFBRDADDR: 958 case SIOCSIFNETMASK: 959 case SIOCSIFDSTADDR: 960 case SIOCSIFPFLAGS: 961 case SIOCSIFFLAGS: 962 if (copy_from_user(&ifr, p, sizeof(struct ifreq))) 963 return -EFAULT; 964 err = devinet_ioctl(net, cmd, &ifr); 965 break; 966 default: 967 if (sk->sk_prot->ioctl) 968 err = sk->sk_prot->ioctl(sk, cmd, arg); 969 else 970 err = -ENOIOCTLCMD; 971 break; 972 } 973 return err; 974 } 975 EXPORT_SYMBOL(inet_ioctl); 976 977 #ifdef CONFIG_COMPAT 978 static int inet_compat_routing_ioctl(struct sock *sk, unsigned int cmd, 979 struct compat_rtentry __user *ur) 980 { 981 compat_uptr_t rtdev; 982 struct rtentry rt; 983 984 if (copy_from_user(&rt.rt_dst, &ur->rt_dst, 985 3 * sizeof(struct sockaddr)) || 986 get_user(rt.rt_flags, &ur->rt_flags) || 987 get_user(rt.rt_metric, &ur->rt_metric) || 988 get_user(rt.rt_mtu, &ur->rt_mtu) || 989 get_user(rt.rt_window, &ur->rt_window) || 990 get_user(rt.rt_irtt, &ur->rt_irtt) || 991 get_user(rtdev, &ur->rt_dev)) 992 return -EFAULT; 993 994 rt.rt_dev = compat_ptr(rtdev); 995 return ip_rt_ioctl(sock_net(sk), cmd, &rt); 996 } 997 998 static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 999 { 1000 void __user *argp = compat_ptr(arg); 1001 struct sock *sk = sock->sk; 1002 1003 switch (cmd) { 1004 case SIOCADDRT: 1005 case SIOCDELRT: 1006 return inet_compat_routing_ioctl(sk, cmd, argp); 1007 default: 1008 if (!sk->sk_prot->compat_ioctl) 1009 return -ENOIOCTLCMD; 1010 return sk->sk_prot->compat_ioctl(sk, cmd, arg); 1011 } 1012 } 1013 #endif /* CONFIG_COMPAT */ 1014 1015 const struct proto_ops inet_stream_ops = { 1016 .family = PF_INET, 1017 .owner = THIS_MODULE, 1018 .release = inet_release, 1019 .bind = inet_bind, 1020 .connect = inet_stream_connect, 1021 .socketpair = sock_no_socketpair, 1022 .accept = inet_accept, 1023 .getname = inet_getname, 1024 .poll = tcp_poll, 1025 .ioctl = inet_ioctl, 1026 .gettstamp = sock_gettstamp, 1027 .listen = inet_listen, 1028 .shutdown = inet_shutdown, 1029 .setsockopt = sock_common_setsockopt, 1030 .getsockopt = sock_common_getsockopt, 1031 .sendmsg = inet_sendmsg, 1032 .recvmsg = inet_recvmsg, 1033 #ifdef CONFIG_MMU 1034 .mmap = tcp_mmap, 1035 #endif 1036 .sendpage = inet_sendpage, 1037 .splice_read = tcp_splice_read, 1038 .read_sock = tcp_read_sock, 1039 .sendmsg_locked = tcp_sendmsg_locked, 1040 .sendpage_locked = tcp_sendpage_locked, 1041 .peek_len = tcp_peek_len, 1042 #ifdef CONFIG_COMPAT 1043 .compat_setsockopt = compat_sock_common_setsockopt, 1044 .compat_getsockopt = compat_sock_common_getsockopt, 1045 .compat_ioctl = inet_compat_ioctl, 1046 #endif 1047 .set_rcvlowat = tcp_set_rcvlowat, 1048 }; 1049 EXPORT_SYMBOL(inet_stream_ops); 1050 1051 const struct proto_ops inet_dgram_ops = { 1052 .family = PF_INET, 1053 .owner = THIS_MODULE, 1054 .release = inet_release, 1055 .bind = inet_bind, 1056 .connect = inet_dgram_connect, 1057 .socketpair = sock_no_socketpair, 1058 .accept = sock_no_accept, 1059 .getname = inet_getname, 1060 .poll = udp_poll, 1061 .ioctl = inet_ioctl, 1062 .gettstamp = sock_gettstamp, 1063 .listen = sock_no_listen, 1064 .shutdown = inet_shutdown, 1065 .setsockopt = sock_common_setsockopt, 1066 .getsockopt = sock_common_getsockopt, 1067 .sendmsg = inet_sendmsg, 1068 .recvmsg = inet_recvmsg, 1069 .mmap = sock_no_mmap, 1070 .sendpage = inet_sendpage, 1071 .set_peek_off = sk_set_peek_off, 1072 #ifdef CONFIG_COMPAT 1073 .compat_setsockopt = compat_sock_common_setsockopt, 1074 .compat_getsockopt = compat_sock_common_getsockopt, 1075 .compat_ioctl = inet_compat_ioctl, 1076 #endif 1077 }; 1078 EXPORT_SYMBOL(inet_dgram_ops); 1079 1080 /* 1081 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 1082 * udp_poll 1083 */ 1084 static const struct proto_ops inet_sockraw_ops = { 1085 .family = PF_INET, 1086 .owner = THIS_MODULE, 1087 .release = inet_release, 1088 .bind = inet_bind, 1089 .connect = inet_dgram_connect, 1090 .socketpair = sock_no_socketpair, 1091 .accept = sock_no_accept, 1092 .getname = inet_getname, 1093 .poll = datagram_poll, 1094 .ioctl = inet_ioctl, 1095 .gettstamp = sock_gettstamp, 1096 .listen = sock_no_listen, 1097 .shutdown = inet_shutdown, 1098 .setsockopt = sock_common_setsockopt, 1099 .getsockopt = sock_common_getsockopt, 1100 .sendmsg = inet_sendmsg, 1101 .recvmsg = inet_recvmsg, 1102 .mmap = sock_no_mmap, 1103 .sendpage = inet_sendpage, 1104 #ifdef CONFIG_COMPAT 1105 .compat_setsockopt = compat_sock_common_setsockopt, 1106 .compat_getsockopt = compat_sock_common_getsockopt, 1107 .compat_ioctl = inet_compat_ioctl, 1108 #endif 1109 }; 1110 1111 static const struct net_proto_family inet_family_ops = { 1112 .family = PF_INET, 1113 .create = inet_create, 1114 .owner = THIS_MODULE, 1115 }; 1116 1117 /* Upon startup we insert all the elements in inetsw_array[] into 1118 * the linked list inetsw. 1119 */ 1120 static struct inet_protosw inetsw_array[] = 1121 { 1122 { 1123 .type = SOCK_STREAM, 1124 .protocol = IPPROTO_TCP, 1125 .prot = &tcp_prot, 1126 .ops = &inet_stream_ops, 1127 .flags = INET_PROTOSW_PERMANENT | 1128 INET_PROTOSW_ICSK, 1129 }, 1130 1131 { 1132 .type = SOCK_DGRAM, 1133 .protocol = IPPROTO_UDP, 1134 .prot = &udp_prot, 1135 .ops = &inet_dgram_ops, 1136 .flags = INET_PROTOSW_PERMANENT, 1137 }, 1138 1139 { 1140 .type = SOCK_DGRAM, 1141 .protocol = IPPROTO_ICMP, 1142 .prot = &ping_prot, 1143 .ops = &inet_sockraw_ops, 1144 .flags = INET_PROTOSW_REUSE, 1145 }, 1146 1147 { 1148 .type = SOCK_RAW, 1149 .protocol = IPPROTO_IP, /* wild card */ 1150 .prot = &raw_prot, 1151 .ops = &inet_sockraw_ops, 1152 .flags = INET_PROTOSW_REUSE, 1153 } 1154 }; 1155 1156 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) 1157 1158 void inet_register_protosw(struct inet_protosw *p) 1159 { 1160 struct list_head *lh; 1161 struct inet_protosw *answer; 1162 int protocol = p->protocol; 1163 struct list_head *last_perm; 1164 1165 spin_lock_bh(&inetsw_lock); 1166 1167 if (p->type >= SOCK_MAX) 1168 goto out_illegal; 1169 1170 /* If we are trying to override a permanent protocol, bail. */ 1171 last_perm = &inetsw[p->type]; 1172 list_for_each(lh, &inetsw[p->type]) { 1173 answer = list_entry(lh, struct inet_protosw, list); 1174 /* Check only the non-wild match. */ 1175 if ((INET_PROTOSW_PERMANENT & answer->flags) == 0) 1176 break; 1177 if (protocol == answer->protocol) 1178 goto out_permanent; 1179 last_perm = lh; 1180 } 1181 1182 /* Add the new entry after the last permanent entry if any, so that 1183 * the new entry does not override a permanent entry when matched with 1184 * a wild-card protocol. But it is allowed to override any existing 1185 * non-permanent entry. This means that when we remove this entry, the 1186 * system automatically returns to the old behavior. 1187 */ 1188 list_add_rcu(&p->list, last_perm); 1189 out: 1190 spin_unlock_bh(&inetsw_lock); 1191 1192 return; 1193 1194 out_permanent: 1195 pr_err("Attempt to override permanent protocol %d\n", protocol); 1196 goto out; 1197 1198 out_illegal: 1199 pr_err("Ignoring attempt to register invalid socket type %d\n", 1200 p->type); 1201 goto out; 1202 } 1203 EXPORT_SYMBOL(inet_register_protosw); 1204 1205 void inet_unregister_protosw(struct inet_protosw *p) 1206 { 1207 if (INET_PROTOSW_PERMANENT & p->flags) { 1208 pr_err("Attempt to unregister permanent protocol %d\n", 1209 p->protocol); 1210 } else { 1211 spin_lock_bh(&inetsw_lock); 1212 list_del_rcu(&p->list); 1213 spin_unlock_bh(&inetsw_lock); 1214 1215 synchronize_net(); 1216 } 1217 } 1218 EXPORT_SYMBOL(inet_unregister_protosw); 1219 1220 static int inet_sk_reselect_saddr(struct sock *sk) 1221 { 1222 struct inet_sock *inet = inet_sk(sk); 1223 __be32 old_saddr = inet->inet_saddr; 1224 __be32 daddr = inet->inet_daddr; 1225 struct flowi4 *fl4; 1226 struct rtable *rt; 1227 __be32 new_saddr; 1228 struct ip_options_rcu *inet_opt; 1229 1230 inet_opt = rcu_dereference_protected(inet->inet_opt, 1231 lockdep_sock_is_held(sk)); 1232 if (inet_opt && inet_opt->opt.srr) 1233 daddr = inet_opt->opt.faddr; 1234 1235 /* Query new route. */ 1236 fl4 = &inet->cork.fl.u.ip4; 1237 rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk), 1238 sk->sk_bound_dev_if, sk->sk_protocol, 1239 inet->inet_sport, inet->inet_dport, sk); 1240 if (IS_ERR(rt)) 1241 return PTR_ERR(rt); 1242 1243 sk_setup_caps(sk, &rt->dst); 1244 1245 new_saddr = fl4->saddr; 1246 1247 if (new_saddr == old_saddr) 1248 return 0; 1249 1250 if (sock_net(sk)->ipv4.sysctl_ip_dynaddr > 1) { 1251 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n", 1252 __func__, &old_saddr, &new_saddr); 1253 } 1254 1255 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr; 1256 1257 /* 1258 * XXX The only one ugly spot where we need to 1259 * XXX really change the sockets identity after 1260 * XXX it has entered the hashes. -DaveM 1261 * 1262 * Besides that, it does not check for connection 1263 * uniqueness. Wait for troubles. 1264 */ 1265 return __sk_prot_rehash(sk); 1266 } 1267 1268 int inet_sk_rebuild_header(struct sock *sk) 1269 { 1270 struct inet_sock *inet = inet_sk(sk); 1271 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); 1272 __be32 daddr; 1273 struct ip_options_rcu *inet_opt; 1274 struct flowi4 *fl4; 1275 int err; 1276 1277 /* Route is OK, nothing to do. */ 1278 if (rt) 1279 return 0; 1280 1281 /* Reroute. */ 1282 rcu_read_lock(); 1283 inet_opt = rcu_dereference(inet->inet_opt); 1284 daddr = inet->inet_daddr; 1285 if (inet_opt && inet_opt->opt.srr) 1286 daddr = inet_opt->opt.faddr; 1287 rcu_read_unlock(); 1288 fl4 = &inet->cork.fl.u.ip4; 1289 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr, 1290 inet->inet_dport, inet->inet_sport, 1291 sk->sk_protocol, RT_CONN_FLAGS(sk), 1292 sk->sk_bound_dev_if); 1293 if (!IS_ERR(rt)) { 1294 err = 0; 1295 sk_setup_caps(sk, &rt->dst); 1296 } else { 1297 err = PTR_ERR(rt); 1298 1299 /* Routing failed... */ 1300 sk->sk_route_caps = 0; 1301 /* 1302 * Other protocols have to map its equivalent state to TCP_SYN_SENT. 1303 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme 1304 */ 1305 if (!sock_net(sk)->ipv4.sysctl_ip_dynaddr || 1306 sk->sk_state != TCP_SYN_SENT || 1307 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 1308 (err = inet_sk_reselect_saddr(sk)) != 0) 1309 sk->sk_err_soft = -err; 1310 } 1311 1312 return err; 1313 } 1314 EXPORT_SYMBOL(inet_sk_rebuild_header); 1315 1316 void inet_sk_set_state(struct sock *sk, int state) 1317 { 1318 trace_inet_sock_set_state(sk, sk->sk_state, state); 1319 sk->sk_state = state; 1320 } 1321 EXPORT_SYMBOL(inet_sk_set_state); 1322 1323 void inet_sk_state_store(struct sock *sk, int newstate) 1324 { 1325 trace_inet_sock_set_state(sk, sk->sk_state, newstate); 1326 smp_store_release(&sk->sk_state, newstate); 1327 } 1328 1329 struct sk_buff *inet_gso_segment(struct sk_buff *skb, 1330 netdev_features_t features) 1331 { 1332 bool udpfrag = false, fixedid = false, gso_partial, encap; 1333 struct sk_buff *segs = ERR_PTR(-EINVAL); 1334 const struct net_offload *ops; 1335 unsigned int offset = 0; 1336 struct iphdr *iph; 1337 int proto, tot_len; 1338 int nhoff; 1339 int ihl; 1340 int id; 1341 1342 skb_reset_network_header(skb); 1343 nhoff = skb_network_header(skb) - skb_mac_header(skb); 1344 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1345 goto out; 1346 1347 iph = ip_hdr(skb); 1348 ihl = iph->ihl * 4; 1349 if (ihl < sizeof(*iph)) 1350 goto out; 1351 1352 id = ntohs(iph->id); 1353 proto = iph->protocol; 1354 1355 /* Warning: after this point, iph might be no longer valid */ 1356 if (unlikely(!pskb_may_pull(skb, ihl))) 1357 goto out; 1358 __skb_pull(skb, ihl); 1359 1360 encap = SKB_GSO_CB(skb)->encap_level > 0; 1361 if (encap) 1362 features &= skb->dev->hw_enc_features; 1363 SKB_GSO_CB(skb)->encap_level += ihl; 1364 1365 skb_reset_transport_header(skb); 1366 1367 segs = ERR_PTR(-EPROTONOSUPPORT); 1368 1369 if (!skb->encapsulation || encap) { 1370 udpfrag = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP); 1371 fixedid = !!(skb_shinfo(skb)->gso_type & SKB_GSO_TCP_FIXEDID); 1372 1373 /* fixed ID is invalid if DF bit is not set */ 1374 if (fixedid && !(ip_hdr(skb)->frag_off & htons(IP_DF))) 1375 goto out; 1376 } 1377 1378 ops = rcu_dereference(inet_offloads[proto]); 1379 if (likely(ops && ops->callbacks.gso_segment)) 1380 segs = ops->callbacks.gso_segment(skb, features); 1381 1382 if (IS_ERR_OR_NULL(segs)) 1383 goto out; 1384 1385 gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL); 1386 1387 skb = segs; 1388 do { 1389 iph = (struct iphdr *)(skb_mac_header(skb) + nhoff); 1390 if (udpfrag) { 1391 iph->frag_off = htons(offset >> 3); 1392 if (skb->next) 1393 iph->frag_off |= htons(IP_MF); 1394 offset += skb->len - nhoff - ihl; 1395 tot_len = skb->len - nhoff; 1396 } else if (skb_is_gso(skb)) { 1397 if (!fixedid) { 1398 iph->id = htons(id); 1399 id += skb_shinfo(skb)->gso_segs; 1400 } 1401 1402 if (gso_partial) 1403 tot_len = skb_shinfo(skb)->gso_size + 1404 SKB_GSO_CB(skb)->data_offset + 1405 skb->head - (unsigned char *)iph; 1406 else 1407 tot_len = skb->len - nhoff; 1408 } else { 1409 if (!fixedid) 1410 iph->id = htons(id++); 1411 tot_len = skb->len - nhoff; 1412 } 1413 iph->tot_len = htons(tot_len); 1414 ip_send_check(iph); 1415 if (encap) 1416 skb_reset_inner_headers(skb); 1417 skb->network_header = (u8 *)iph - skb->head; 1418 skb_reset_mac_len(skb); 1419 } while ((skb = skb->next)); 1420 1421 out: 1422 return segs; 1423 } 1424 EXPORT_SYMBOL(inet_gso_segment); 1425 1426 static struct sk_buff *ipip_gso_segment(struct sk_buff *skb, 1427 netdev_features_t features) 1428 { 1429 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_IPXIP4)) 1430 return ERR_PTR(-EINVAL); 1431 1432 return inet_gso_segment(skb, features); 1433 } 1434 1435 struct sk_buff *inet_gro_receive(struct list_head *head, struct sk_buff *skb) 1436 { 1437 const struct net_offload *ops; 1438 struct sk_buff *pp = NULL; 1439 const struct iphdr *iph; 1440 struct sk_buff *p; 1441 unsigned int hlen; 1442 unsigned int off; 1443 unsigned int id; 1444 int flush = 1; 1445 int proto; 1446 1447 off = skb_gro_offset(skb); 1448 hlen = off + sizeof(*iph); 1449 iph = skb_gro_header_fast(skb, off); 1450 if (skb_gro_header_hard(skb, hlen)) { 1451 iph = skb_gro_header_slow(skb, hlen, off); 1452 if (unlikely(!iph)) 1453 goto out; 1454 } 1455 1456 proto = iph->protocol; 1457 1458 rcu_read_lock(); 1459 ops = rcu_dereference(inet_offloads[proto]); 1460 if (!ops || !ops->callbacks.gro_receive) 1461 goto out_unlock; 1462 1463 if (*(u8 *)iph != 0x45) 1464 goto out_unlock; 1465 1466 if (ip_is_fragment(iph)) 1467 goto out_unlock; 1468 1469 if (unlikely(ip_fast_csum((u8 *)iph, 5))) 1470 goto out_unlock; 1471 1472 id = ntohl(*(__be32 *)&iph->id); 1473 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF)); 1474 id >>= 16; 1475 1476 list_for_each_entry(p, head, list) { 1477 struct iphdr *iph2; 1478 u16 flush_id; 1479 1480 if (!NAPI_GRO_CB(p)->same_flow) 1481 continue; 1482 1483 iph2 = (struct iphdr *)(p->data + off); 1484 /* The above works because, with the exception of the top 1485 * (inner most) layer, we only aggregate pkts with the same 1486 * hdr length so all the hdrs we'll need to verify will start 1487 * at the same offset. 1488 */ 1489 if ((iph->protocol ^ iph2->protocol) | 1490 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) | 1491 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) { 1492 NAPI_GRO_CB(p)->same_flow = 0; 1493 continue; 1494 } 1495 1496 /* All fields must match except length and checksum. */ 1497 NAPI_GRO_CB(p)->flush |= 1498 (iph->ttl ^ iph2->ttl) | 1499 (iph->tos ^ iph2->tos) | 1500 ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF)); 1501 1502 NAPI_GRO_CB(p)->flush |= flush; 1503 1504 /* We need to store of the IP ID check to be included later 1505 * when we can verify that this packet does in fact belong 1506 * to a given flow. 1507 */ 1508 flush_id = (u16)(id - ntohs(iph2->id)); 1509 1510 /* This bit of code makes it much easier for us to identify 1511 * the cases where we are doing atomic vs non-atomic IP ID 1512 * checks. Specifically an atomic check can return IP ID 1513 * values 0 - 0xFFFF, while a non-atomic check can only 1514 * return 0 or 0xFFFF. 1515 */ 1516 if (!NAPI_GRO_CB(p)->is_atomic || 1517 !(iph->frag_off & htons(IP_DF))) { 1518 flush_id ^= NAPI_GRO_CB(p)->count; 1519 flush_id = flush_id ? 0xFFFF : 0; 1520 } 1521 1522 /* If the previous IP ID value was based on an atomic 1523 * datagram we can overwrite the value and ignore it. 1524 */ 1525 if (NAPI_GRO_CB(skb)->is_atomic) 1526 NAPI_GRO_CB(p)->flush_id = flush_id; 1527 else 1528 NAPI_GRO_CB(p)->flush_id |= flush_id; 1529 } 1530 1531 NAPI_GRO_CB(skb)->is_atomic = !!(iph->frag_off & htons(IP_DF)); 1532 NAPI_GRO_CB(skb)->flush |= flush; 1533 skb_set_network_header(skb, off); 1534 /* The above will be needed by the transport layer if there is one 1535 * immediately following this IP hdr. 1536 */ 1537 1538 /* Note : No need to call skb_gro_postpull_rcsum() here, 1539 * as we already checked checksum over ipv4 header was 0 1540 */ 1541 skb_gro_pull(skb, sizeof(*iph)); 1542 skb_set_transport_header(skb, skb_gro_offset(skb)); 1543 1544 pp = indirect_call_gro_receive(tcp4_gro_receive, udp4_gro_receive, 1545 ops->callbacks.gro_receive, head, skb); 1546 1547 out_unlock: 1548 rcu_read_unlock(); 1549 1550 out: 1551 skb_gro_flush_final(skb, pp, flush); 1552 1553 return pp; 1554 } 1555 EXPORT_SYMBOL(inet_gro_receive); 1556 1557 static struct sk_buff *ipip_gro_receive(struct list_head *head, 1558 struct sk_buff *skb) 1559 { 1560 if (NAPI_GRO_CB(skb)->encap_mark) { 1561 NAPI_GRO_CB(skb)->flush = 1; 1562 return NULL; 1563 } 1564 1565 NAPI_GRO_CB(skb)->encap_mark = 1; 1566 1567 return inet_gro_receive(head, skb); 1568 } 1569 1570 #define SECONDS_PER_DAY 86400 1571 1572 /* inet_current_timestamp - Return IP network timestamp 1573 * 1574 * Return milliseconds since midnight in network byte order. 1575 */ 1576 __be32 inet_current_timestamp(void) 1577 { 1578 u32 secs; 1579 u32 msecs; 1580 struct timespec64 ts; 1581 1582 ktime_get_real_ts64(&ts); 1583 1584 /* Get secs since midnight. */ 1585 (void)div_u64_rem(ts.tv_sec, SECONDS_PER_DAY, &secs); 1586 /* Convert to msecs. */ 1587 msecs = secs * MSEC_PER_SEC; 1588 /* Convert nsec to msec. */ 1589 msecs += (u32)ts.tv_nsec / NSEC_PER_MSEC; 1590 1591 /* Convert to network byte order. */ 1592 return htonl(msecs); 1593 } 1594 EXPORT_SYMBOL(inet_current_timestamp); 1595 1596 int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 1597 { 1598 if (sk->sk_family == AF_INET) 1599 return ip_recv_error(sk, msg, len, addr_len); 1600 #if IS_ENABLED(CONFIG_IPV6) 1601 if (sk->sk_family == AF_INET6) 1602 return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len); 1603 #endif 1604 return -EINVAL; 1605 } 1606 1607 int inet_gro_complete(struct sk_buff *skb, int nhoff) 1608 { 1609 __be16 newlen = htons(skb->len - nhoff); 1610 struct iphdr *iph = (struct iphdr *)(skb->data + nhoff); 1611 const struct net_offload *ops; 1612 int proto = iph->protocol; 1613 int err = -ENOSYS; 1614 1615 if (skb->encapsulation) { 1616 skb_set_inner_protocol(skb, cpu_to_be16(ETH_P_IP)); 1617 skb_set_inner_network_header(skb, nhoff); 1618 } 1619 1620 csum_replace2(&iph->check, iph->tot_len, newlen); 1621 iph->tot_len = newlen; 1622 1623 rcu_read_lock(); 1624 ops = rcu_dereference(inet_offloads[proto]); 1625 if (WARN_ON(!ops || !ops->callbacks.gro_complete)) 1626 goto out_unlock; 1627 1628 /* Only need to add sizeof(*iph) to get to the next hdr below 1629 * because any hdr with option will have been flushed in 1630 * inet_gro_receive(). 1631 */ 1632 err = INDIRECT_CALL_2(ops->callbacks.gro_complete, 1633 tcp4_gro_complete, udp4_gro_complete, 1634 skb, nhoff + sizeof(*iph)); 1635 1636 out_unlock: 1637 rcu_read_unlock(); 1638 1639 return err; 1640 } 1641 EXPORT_SYMBOL(inet_gro_complete); 1642 1643 static int ipip_gro_complete(struct sk_buff *skb, int nhoff) 1644 { 1645 skb->encapsulation = 1; 1646 skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4; 1647 return inet_gro_complete(skb, nhoff); 1648 } 1649 1650 int inet_ctl_sock_create(struct sock **sk, unsigned short family, 1651 unsigned short type, unsigned char protocol, 1652 struct net *net) 1653 { 1654 struct socket *sock; 1655 int rc = sock_create_kern(net, family, type, protocol, &sock); 1656 1657 if (rc == 0) { 1658 *sk = sock->sk; 1659 (*sk)->sk_allocation = GFP_ATOMIC; 1660 /* 1661 * Unhash it so that IP input processing does not even see it, 1662 * we do not wish this socket to see incoming packets. 1663 */ 1664 (*sk)->sk_prot->unhash(*sk); 1665 } 1666 return rc; 1667 } 1668 EXPORT_SYMBOL_GPL(inet_ctl_sock_create); 1669 1670 u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offt) 1671 { 1672 return *(((unsigned long *)per_cpu_ptr(mib, cpu)) + offt); 1673 } 1674 EXPORT_SYMBOL_GPL(snmp_get_cpu_field); 1675 1676 unsigned long snmp_fold_field(void __percpu *mib, int offt) 1677 { 1678 unsigned long res = 0; 1679 int i; 1680 1681 for_each_possible_cpu(i) 1682 res += snmp_get_cpu_field(mib, i, offt); 1683 return res; 1684 } 1685 EXPORT_SYMBOL_GPL(snmp_fold_field); 1686 1687 #if BITS_PER_LONG==32 1688 1689 u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offt, 1690 size_t syncp_offset) 1691 { 1692 void *bhptr; 1693 struct u64_stats_sync *syncp; 1694 u64 v; 1695 unsigned int start; 1696 1697 bhptr = per_cpu_ptr(mib, cpu); 1698 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset); 1699 do { 1700 start = u64_stats_fetch_begin_irq(syncp); 1701 v = *(((u64 *)bhptr) + offt); 1702 } while (u64_stats_fetch_retry_irq(syncp, start)); 1703 1704 return v; 1705 } 1706 EXPORT_SYMBOL_GPL(snmp_get_cpu_field64); 1707 1708 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset) 1709 { 1710 u64 res = 0; 1711 int cpu; 1712 1713 for_each_possible_cpu(cpu) { 1714 res += snmp_get_cpu_field64(mib, cpu, offt, syncp_offset); 1715 } 1716 return res; 1717 } 1718 EXPORT_SYMBOL_GPL(snmp_fold_field64); 1719 #endif 1720 1721 #ifdef CONFIG_IP_MULTICAST 1722 static const struct net_protocol igmp_protocol = { 1723 .handler = igmp_rcv, 1724 .netns_ok = 1, 1725 }; 1726 #endif 1727 1728 /* thinking of making this const? Don't. 1729 * early_demux can change based on sysctl. 1730 */ 1731 static struct net_protocol tcp_protocol = { 1732 .early_demux = tcp_v4_early_demux, 1733 .early_demux_handler = tcp_v4_early_demux, 1734 .handler = tcp_v4_rcv, 1735 .err_handler = tcp_v4_err, 1736 .no_policy = 1, 1737 .netns_ok = 1, 1738 .icmp_strict_tag_validation = 1, 1739 }; 1740 1741 /* thinking of making this const? Don't. 1742 * early_demux can change based on sysctl. 1743 */ 1744 static struct net_protocol udp_protocol = { 1745 .early_demux = udp_v4_early_demux, 1746 .early_demux_handler = udp_v4_early_demux, 1747 .handler = udp_rcv, 1748 .err_handler = udp_err, 1749 .no_policy = 1, 1750 .netns_ok = 1, 1751 }; 1752 1753 static const struct net_protocol icmp_protocol = { 1754 .handler = icmp_rcv, 1755 .err_handler = icmp_err, 1756 .no_policy = 1, 1757 .netns_ok = 1, 1758 }; 1759 1760 static __net_init int ipv4_mib_init_net(struct net *net) 1761 { 1762 int i; 1763 1764 net->mib.tcp_statistics = alloc_percpu(struct tcp_mib); 1765 if (!net->mib.tcp_statistics) 1766 goto err_tcp_mib; 1767 net->mib.ip_statistics = alloc_percpu(struct ipstats_mib); 1768 if (!net->mib.ip_statistics) 1769 goto err_ip_mib; 1770 1771 for_each_possible_cpu(i) { 1772 struct ipstats_mib *af_inet_stats; 1773 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i); 1774 u64_stats_init(&af_inet_stats->syncp); 1775 } 1776 1777 net->mib.net_statistics = alloc_percpu(struct linux_mib); 1778 if (!net->mib.net_statistics) 1779 goto err_net_mib; 1780 net->mib.udp_statistics = alloc_percpu(struct udp_mib); 1781 if (!net->mib.udp_statistics) 1782 goto err_udp_mib; 1783 net->mib.udplite_statistics = alloc_percpu(struct udp_mib); 1784 if (!net->mib.udplite_statistics) 1785 goto err_udplite_mib; 1786 net->mib.icmp_statistics = alloc_percpu(struct icmp_mib); 1787 if (!net->mib.icmp_statistics) 1788 goto err_icmp_mib; 1789 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib), 1790 GFP_KERNEL); 1791 if (!net->mib.icmpmsg_statistics) 1792 goto err_icmpmsg_mib; 1793 1794 tcp_mib_init(net); 1795 return 0; 1796 1797 err_icmpmsg_mib: 1798 free_percpu(net->mib.icmp_statistics); 1799 err_icmp_mib: 1800 free_percpu(net->mib.udplite_statistics); 1801 err_udplite_mib: 1802 free_percpu(net->mib.udp_statistics); 1803 err_udp_mib: 1804 free_percpu(net->mib.net_statistics); 1805 err_net_mib: 1806 free_percpu(net->mib.ip_statistics); 1807 err_ip_mib: 1808 free_percpu(net->mib.tcp_statistics); 1809 err_tcp_mib: 1810 return -ENOMEM; 1811 } 1812 1813 static __net_exit void ipv4_mib_exit_net(struct net *net) 1814 { 1815 kfree(net->mib.icmpmsg_statistics); 1816 free_percpu(net->mib.icmp_statistics); 1817 free_percpu(net->mib.udplite_statistics); 1818 free_percpu(net->mib.udp_statistics); 1819 free_percpu(net->mib.net_statistics); 1820 free_percpu(net->mib.ip_statistics); 1821 free_percpu(net->mib.tcp_statistics); 1822 #ifdef CONFIG_MPTCP 1823 /* allocated on demand, see mptcp_init_sock() */ 1824 free_percpu(net->mib.mptcp_statistics); 1825 #endif 1826 } 1827 1828 static __net_initdata struct pernet_operations ipv4_mib_ops = { 1829 .init = ipv4_mib_init_net, 1830 .exit = ipv4_mib_exit_net, 1831 }; 1832 1833 static int __init init_ipv4_mibs(void) 1834 { 1835 return register_pernet_subsys(&ipv4_mib_ops); 1836 } 1837 1838 static __net_init int inet_init_net(struct net *net) 1839 { 1840 /* 1841 * Set defaults for local port range 1842 */ 1843 seqlock_init(&net->ipv4.ip_local_ports.lock); 1844 net->ipv4.ip_local_ports.range[0] = 32768; 1845 net->ipv4.ip_local_ports.range[1] = 60999; 1846 1847 seqlock_init(&net->ipv4.ping_group_range.lock); 1848 /* 1849 * Sane defaults - nobody may create ping sockets. 1850 * Boot scripts should set this to distro-specific group. 1851 */ 1852 net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1); 1853 net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0); 1854 1855 /* Default values for sysctl-controlled parameters. 1856 * We set them here, in case sysctl is not compiled. 1857 */ 1858 net->ipv4.sysctl_ip_default_ttl = IPDEFTTL; 1859 net->ipv4.sysctl_ip_fwd_update_priority = 1; 1860 net->ipv4.sysctl_ip_dynaddr = 0; 1861 net->ipv4.sysctl_ip_early_demux = 1; 1862 net->ipv4.sysctl_udp_early_demux = 1; 1863 net->ipv4.sysctl_tcp_early_demux = 1; 1864 net->ipv4.sysctl_nexthop_compat_mode = 1; 1865 #ifdef CONFIG_SYSCTL 1866 net->ipv4.sysctl_ip_prot_sock = PROT_SOCK; 1867 #endif 1868 1869 /* Some igmp sysctl, whose values are always used */ 1870 net->ipv4.sysctl_igmp_max_memberships = 20; 1871 net->ipv4.sysctl_igmp_max_msf = 10; 1872 /* IGMP reports for link-local multicast groups are enabled by default */ 1873 net->ipv4.sysctl_igmp_llm_reports = 1; 1874 net->ipv4.sysctl_igmp_qrv = 2; 1875 1876 return 0; 1877 } 1878 1879 static __net_initdata struct pernet_operations af_inet_ops = { 1880 .init = inet_init_net, 1881 }; 1882 1883 static int __init init_inet_pernet_ops(void) 1884 { 1885 return register_pernet_subsys(&af_inet_ops); 1886 } 1887 1888 static int ipv4_proc_init(void); 1889 1890 /* 1891 * IP protocol layer initialiser 1892 */ 1893 1894 static struct packet_offload ip_packet_offload __read_mostly = { 1895 .type = cpu_to_be16(ETH_P_IP), 1896 .callbacks = { 1897 .gso_segment = inet_gso_segment, 1898 .gro_receive = inet_gro_receive, 1899 .gro_complete = inet_gro_complete, 1900 }, 1901 }; 1902 1903 static const struct net_offload ipip_offload = { 1904 .callbacks = { 1905 .gso_segment = ipip_gso_segment, 1906 .gro_receive = ipip_gro_receive, 1907 .gro_complete = ipip_gro_complete, 1908 }, 1909 }; 1910 1911 static int __init ipip_offload_init(void) 1912 { 1913 return inet_add_offload(&ipip_offload, IPPROTO_IPIP); 1914 } 1915 1916 static int __init ipv4_offload_init(void) 1917 { 1918 /* 1919 * Add offloads 1920 */ 1921 if (udpv4_offload_init() < 0) 1922 pr_crit("%s: Cannot add UDP protocol offload\n", __func__); 1923 if (tcpv4_offload_init() < 0) 1924 pr_crit("%s: Cannot add TCP protocol offload\n", __func__); 1925 if (ipip_offload_init() < 0) 1926 pr_crit("%s: Cannot add IPIP protocol offload\n", __func__); 1927 1928 dev_add_offload(&ip_packet_offload); 1929 return 0; 1930 } 1931 1932 fs_initcall(ipv4_offload_init); 1933 1934 static struct packet_type ip_packet_type __read_mostly = { 1935 .type = cpu_to_be16(ETH_P_IP), 1936 .func = ip_rcv, 1937 .list_func = ip_list_rcv, 1938 }; 1939 1940 static int __init inet_init(void) 1941 { 1942 struct inet_protosw *q; 1943 struct list_head *r; 1944 int rc; 1945 1946 sock_skb_cb_check_size(sizeof(struct inet_skb_parm)); 1947 1948 rc = proto_register(&tcp_prot, 1); 1949 if (rc) 1950 goto out; 1951 1952 rc = proto_register(&udp_prot, 1); 1953 if (rc) 1954 goto out_unregister_tcp_proto; 1955 1956 rc = proto_register(&raw_prot, 1); 1957 if (rc) 1958 goto out_unregister_udp_proto; 1959 1960 rc = proto_register(&ping_prot, 1); 1961 if (rc) 1962 goto out_unregister_raw_proto; 1963 1964 /* 1965 * Tell SOCKET that we are alive... 1966 */ 1967 1968 (void)sock_register(&inet_family_ops); 1969 1970 #ifdef CONFIG_SYSCTL 1971 ip_static_sysctl_init(); 1972 #endif 1973 1974 /* 1975 * Add all the base protocols. 1976 */ 1977 1978 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 1979 pr_crit("%s: Cannot add ICMP protocol\n", __func__); 1980 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) 1981 pr_crit("%s: Cannot add UDP protocol\n", __func__); 1982 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) 1983 pr_crit("%s: Cannot add TCP protocol\n", __func__); 1984 #ifdef CONFIG_IP_MULTICAST 1985 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 1986 pr_crit("%s: Cannot add IGMP protocol\n", __func__); 1987 #endif 1988 1989 /* Register the socket-side information for inet_create. */ 1990 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 1991 INIT_LIST_HEAD(r); 1992 1993 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 1994 inet_register_protosw(q); 1995 1996 /* 1997 * Set the ARP module up 1998 */ 1999 2000 arp_init(); 2001 2002 /* 2003 * Set the IP module up 2004 */ 2005 2006 ip_init(); 2007 2008 /* Setup TCP slab cache for open requests. */ 2009 tcp_init(); 2010 2011 /* Setup UDP memory threshold */ 2012 udp_init(); 2013 2014 /* Add UDP-Lite (RFC 3828) */ 2015 udplite4_register(); 2016 2017 raw_init(); 2018 2019 ping_init(); 2020 2021 /* 2022 * Set the ICMP layer up 2023 */ 2024 2025 if (icmp_init() < 0) 2026 panic("Failed to create the ICMP control socket.\n"); 2027 2028 /* 2029 * Initialise the multicast router 2030 */ 2031 #if defined(CONFIG_IP_MROUTE) 2032 if (ip_mr_init()) 2033 pr_crit("%s: Cannot init ipv4 mroute\n", __func__); 2034 #endif 2035 2036 if (init_inet_pernet_ops()) 2037 pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__); 2038 /* 2039 * Initialise per-cpu ipv4 mibs 2040 */ 2041 2042 if (init_ipv4_mibs()) 2043 pr_crit("%s: Cannot init ipv4 mibs\n", __func__); 2044 2045 ipv4_proc_init(); 2046 2047 ipfrag_init(); 2048 2049 dev_add_pack(&ip_packet_type); 2050 2051 ip_tunnel_core_init(); 2052 2053 rc = 0; 2054 out: 2055 return rc; 2056 out_unregister_raw_proto: 2057 proto_unregister(&raw_prot); 2058 out_unregister_udp_proto: 2059 proto_unregister(&udp_prot); 2060 out_unregister_tcp_proto: 2061 proto_unregister(&tcp_prot); 2062 goto out; 2063 } 2064 2065 fs_initcall(inet_init); 2066 2067 /* ------------------------------------------------------------------------ */ 2068 2069 #ifdef CONFIG_PROC_FS 2070 static int __init ipv4_proc_init(void) 2071 { 2072 int rc = 0; 2073 2074 if (raw_proc_init()) 2075 goto out_raw; 2076 if (tcp4_proc_init()) 2077 goto out_tcp; 2078 if (udp4_proc_init()) 2079 goto out_udp; 2080 if (ping_proc_init()) 2081 goto out_ping; 2082 if (ip_misc_proc_init()) 2083 goto out_misc; 2084 out: 2085 return rc; 2086 out_misc: 2087 ping_proc_exit(); 2088 out_ping: 2089 udp4_proc_exit(); 2090 out_udp: 2091 tcp4_proc_exit(); 2092 out_tcp: 2093 raw_proc_exit(); 2094 out_raw: 2095 rc = -ENOMEM; 2096 goto out; 2097 } 2098 2099 #else /* CONFIG_PROC_FS */ 2100 static int __init ipv4_proc_init(void) 2101 { 2102 return 0; 2103 } 2104 #endif /* CONFIG_PROC_FS */ 2105