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/gro.h> 103 #include <net/gso.h> 104 #include <net/tcp.h> 105 #include <net/udp.h> 106 #include <net/udplite.h> 107 #include <net/ping.h> 108 #include <linux/skbuff.h> 109 #include <net/sock.h> 110 #include <net/raw.h> 111 #include <net/icmp.h> 112 #include <net/inet_common.h> 113 #include <net/ip_tunnels.h> 114 #include <net/xfrm.h> 115 #include <net/net_namespace.h> 116 #include <net/secure_seq.h> 117 #ifdef CONFIG_IP_MROUTE 118 #include <linux/mroute.h> 119 #endif 120 #include <net/l3mdev.h> 121 #include <net/compat.h> 122 #include <net/rps.h> 123 124 #include <trace/events/sock.h> 125 126 /* The inetsw table contains everything that inet_create needs to 127 * build a new socket. 128 */ 129 static struct list_head inetsw[SOCK_MAX]; 130 static DEFINE_SPINLOCK(inetsw_lock); 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_final(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_ONCE(atomic_read(&sk->sk_rmem_alloc)); 154 WARN_ON_ONCE(refcount_read(&sk->sk_wmem_alloc)); 155 WARN_ON_ONCE(sk->sk_wmem_queued); 156 WARN_ON_ONCE(sk_forward_alloc_get(sk)); 157 158 kfree(rcu_dereference_protected(inet->inet_opt, 1)); 159 dst_release(rcu_dereference_protected(sk->sk_dst_cache, 1)); 160 dst_release(rcu_dereference_protected(sk->sk_rx_dst, 1)); 161 } 162 EXPORT_SYMBOL(inet_sock_destruct); 163 164 /* 165 * The routines beyond this point handle the behaviour of an AF_INET 166 * socket object. Mostly it punts to the subprotocols of IP to do 167 * the work. 168 */ 169 170 /* 171 * Automatically bind an unbound socket. 172 */ 173 174 static int inet_autobind(struct sock *sk) 175 { 176 struct inet_sock *inet; 177 /* We may need to bind the socket. */ 178 lock_sock(sk); 179 inet = inet_sk(sk); 180 if (!inet->inet_num) { 181 if (sk->sk_prot->get_port(sk, 0)) { 182 release_sock(sk); 183 return -EAGAIN; 184 } 185 inet->inet_sport = htons(inet->inet_num); 186 } 187 release_sock(sk); 188 return 0; 189 } 190 191 int __inet_listen_sk(struct sock *sk, int backlog) 192 { 193 unsigned char old_state = sk->sk_state; 194 int err, tcp_fastopen; 195 196 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN))) 197 return -EINVAL; 198 199 WRITE_ONCE(sk->sk_max_ack_backlog, backlog); 200 /* Really, if the socket is already in listen state 201 * we can only allow the backlog to be adjusted. 202 */ 203 if (old_state != TCP_LISTEN) { 204 /* Enable TFO w/o requiring TCP_FASTOPEN socket option. 205 * Note that only TCP sockets (SOCK_STREAM) will reach here. 206 * Also fastopen backlog may already been set via the option 207 * because the socket was in TCP_LISTEN state previously but 208 * was shutdown() rather than close(). 209 */ 210 tcp_fastopen = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_fastopen); 211 if ((tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) && 212 (tcp_fastopen & TFO_SERVER_ENABLE) && 213 !inet_csk(sk)->icsk_accept_queue.fastopenq.max_qlen) { 214 fastopen_queue_tune(sk, backlog); 215 tcp_fastopen_init_key_once(sock_net(sk)); 216 } 217 218 err = inet_csk_listen_start(sk); 219 if (err) 220 return err; 221 222 tcp_call_bpf(sk, BPF_SOCK_OPS_TCP_LISTEN_CB, 0, NULL); 223 } 224 return 0; 225 } 226 227 /* 228 * Move a socket into listening state. 229 */ 230 int inet_listen(struct socket *sock, int backlog) 231 { 232 struct sock *sk = sock->sk; 233 int err = -EINVAL; 234 235 lock_sock(sk); 236 237 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM) 238 goto out; 239 240 err = __inet_listen_sk(sk, backlog); 241 242 out: 243 release_sock(sk); 244 return err; 245 } 246 EXPORT_SYMBOL(inet_listen); 247 248 /* 249 * Create an inet socket. 250 */ 251 252 static int inet_create(struct net *net, struct socket *sock, int protocol, 253 int kern) 254 { 255 struct sock *sk; 256 struct inet_protosw *answer; 257 struct inet_sock *inet; 258 struct proto *answer_prot; 259 unsigned char answer_flags; 260 int try_loading_module = 0; 261 int err; 262 263 if (protocol < 0 || protocol >= IPPROTO_MAX) 264 return -EINVAL; 265 266 sock->state = SS_UNCONNECTED; 267 268 /* Look for the requested type/protocol pair. */ 269 lookup_protocol: 270 err = -ESOCKTNOSUPPORT; 271 rcu_read_lock(); 272 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) { 273 274 err = 0; 275 /* Check the non-wild match. */ 276 if (protocol == answer->protocol) { 277 if (protocol != IPPROTO_IP) 278 break; 279 } else { 280 /* Check for the two wild cases. */ 281 if (IPPROTO_IP == protocol) { 282 protocol = answer->protocol; 283 break; 284 } 285 if (IPPROTO_IP == answer->protocol) 286 break; 287 } 288 err = -EPROTONOSUPPORT; 289 } 290 291 if (unlikely(err)) { 292 if (try_loading_module < 2) { 293 rcu_read_unlock(); 294 /* 295 * Be more specific, e.g. net-pf-2-proto-132-type-1 296 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) 297 */ 298 if (++try_loading_module == 1) 299 request_module("net-pf-%d-proto-%d-type-%d", 300 PF_INET, protocol, sock->type); 301 /* 302 * Fall back to generic, e.g. net-pf-2-proto-132 303 * (net-pf-PF_INET-proto-IPPROTO_SCTP) 304 */ 305 else 306 request_module("net-pf-%d-proto-%d", 307 PF_INET, protocol); 308 goto lookup_protocol; 309 } else 310 goto out_rcu_unlock; 311 } 312 313 err = -EPERM; 314 if (sock->type == SOCK_RAW && !kern && 315 !ns_capable(net->user_ns, CAP_NET_RAW)) 316 goto out_rcu_unlock; 317 318 sock->ops = answer->ops; 319 answer_prot = answer->prot; 320 answer_flags = answer->flags; 321 rcu_read_unlock(); 322 323 WARN_ON(!answer_prot->slab); 324 325 err = -ENOMEM; 326 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot, kern); 327 if (!sk) 328 goto out; 329 330 err = 0; 331 if (INET_PROTOSW_REUSE & answer_flags) 332 sk->sk_reuse = SK_CAN_REUSE; 333 334 if (INET_PROTOSW_ICSK & answer_flags) 335 inet_init_csk_locks(sk); 336 337 inet = inet_sk(sk); 338 inet_assign_bit(IS_ICSK, sk, INET_PROTOSW_ICSK & answer_flags); 339 340 inet_clear_bit(NODEFRAG, sk); 341 342 if (SOCK_RAW == sock->type) { 343 inet->inet_num = protocol; 344 if (IPPROTO_RAW == protocol) 345 inet_set_bit(HDRINCL, sk); 346 } 347 348 if (READ_ONCE(net->ipv4.sysctl_ip_no_pmtu_disc)) 349 inet->pmtudisc = IP_PMTUDISC_DONT; 350 else 351 inet->pmtudisc = IP_PMTUDISC_WANT; 352 353 atomic_set(&inet->inet_id, 0); 354 355 sock_init_data(sock, sk); 356 357 sk->sk_destruct = inet_sock_destruct; 358 sk->sk_protocol = protocol; 359 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 360 sk->sk_txrehash = READ_ONCE(net->core.sysctl_txrehash); 361 362 inet->uc_ttl = -1; 363 inet_set_bit(MC_LOOP, sk); 364 inet->mc_ttl = 1; 365 inet_set_bit(MC_ALL, sk); 366 inet->mc_index = 0; 367 inet->mc_list = NULL; 368 inet->rcv_tos = 0; 369 370 if (inet->inet_num) { 371 /* It assumes that any protocol which allows 372 * the user to assign a number at socket 373 * creation time automatically 374 * shares. 375 */ 376 inet->inet_sport = htons(inet->inet_num); 377 /* Add to protocol hash chains. */ 378 err = sk->sk_prot->hash(sk); 379 if (err) { 380 sk_common_release(sk); 381 goto out; 382 } 383 } 384 385 if (sk->sk_prot->init) { 386 err = sk->sk_prot->init(sk); 387 if (err) { 388 sk_common_release(sk); 389 goto out; 390 } 391 } 392 393 if (!kern) { 394 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk); 395 if (err) { 396 sk_common_release(sk); 397 goto out; 398 } 399 } 400 out: 401 return err; 402 out_rcu_unlock: 403 rcu_read_unlock(); 404 goto out; 405 } 406 407 408 /* 409 * The peer socket should always be NULL (or else). When we call this 410 * function we are destroying the object and from then on nobody 411 * should refer to it. 412 */ 413 int inet_release(struct socket *sock) 414 { 415 struct sock *sk = sock->sk; 416 417 if (sk) { 418 long timeout; 419 420 if (!sk->sk_kern_sock) 421 BPF_CGROUP_RUN_PROG_INET_SOCK_RELEASE(sk); 422 423 /* Applications forget to leave groups before exiting */ 424 ip_mc_drop_socket(sk); 425 426 /* If linger is set, we don't return until the close 427 * is complete. Otherwise we return immediately. The 428 * actually closing is done the same either way. 429 * 430 * If the close is due to the process exiting, we never 431 * linger.. 432 */ 433 timeout = 0; 434 if (sock_flag(sk, SOCK_LINGER) && 435 !(current->flags & PF_EXITING)) 436 timeout = sk->sk_lingertime; 437 sk->sk_prot->close(sk, timeout); 438 sock->sk = NULL; 439 } 440 return 0; 441 } 442 EXPORT_SYMBOL(inet_release); 443 444 int inet_bind_sk(struct sock *sk, struct sockaddr *uaddr, int addr_len) 445 { 446 u32 flags = BIND_WITH_LOCK; 447 int err; 448 449 /* If the socket has its own bind function then use it. (RAW) */ 450 if (sk->sk_prot->bind) { 451 return sk->sk_prot->bind(sk, uaddr, addr_len); 452 } 453 if (addr_len < sizeof(struct sockaddr_in)) 454 return -EINVAL; 455 456 /* BPF prog is run before any checks are done so that if the prog 457 * changes context in a wrong way it will be caught. 458 */ 459 err = BPF_CGROUP_RUN_PROG_INET_BIND_LOCK(sk, uaddr, &addr_len, 460 CGROUP_INET4_BIND, &flags); 461 if (err) 462 return err; 463 464 return __inet_bind(sk, uaddr, addr_len, flags); 465 } 466 467 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 468 { 469 return inet_bind_sk(sock->sk, uaddr, addr_len); 470 } 471 EXPORT_SYMBOL(inet_bind); 472 473 int __inet_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len, 474 u32 flags) 475 { 476 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 477 struct inet_sock *inet = inet_sk(sk); 478 struct net *net = sock_net(sk); 479 unsigned short snum; 480 int chk_addr_ret; 481 u32 tb_id = RT_TABLE_LOCAL; 482 int err; 483 484 if (addr->sin_family != AF_INET) { 485 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET) 486 * only if s_addr is INADDR_ANY. 487 */ 488 err = -EAFNOSUPPORT; 489 if (addr->sin_family != AF_UNSPEC || 490 addr->sin_addr.s_addr != htonl(INADDR_ANY)) 491 goto out; 492 } 493 494 tb_id = l3mdev_fib_table_by_index(net, sk->sk_bound_dev_if) ? : tb_id; 495 chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id); 496 497 /* Not specified by any standard per-se, however it breaks too 498 * many applications when removed. It is unfortunate since 499 * allowing applications to make a non-local bind solves 500 * several problems with systems using dynamic addressing. 501 * (ie. your servers still start up even if your ISDN link 502 * is temporarily down) 503 */ 504 err = -EADDRNOTAVAIL; 505 if (!inet_addr_valid_or_nonlocal(net, inet, addr->sin_addr.s_addr, 506 chk_addr_ret)) 507 goto out; 508 509 snum = ntohs(addr->sin_port); 510 err = -EACCES; 511 if (!(flags & BIND_NO_CAP_NET_BIND_SERVICE) && 512 snum && inet_port_requires_bind_service(net, snum) && 513 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 514 goto out; 515 516 /* We keep a pair of addresses. rcv_saddr is the one 517 * used by hash lookups, and saddr is used for transmit. 518 * 519 * In the BSD API these are the same except where it 520 * would be illegal to use them (multicast/broadcast) in 521 * which case the sending device address is used. 522 */ 523 if (flags & BIND_WITH_LOCK) 524 lock_sock(sk); 525 526 /* Check these errors (active socket, double bind). */ 527 err = -EINVAL; 528 if (sk->sk_state != TCP_CLOSE || inet->inet_num) 529 goto out_release_sock; 530 531 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 532 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 533 inet->inet_saddr = 0; /* Use device */ 534 535 /* Make sure we are allowed to bind here. */ 536 if (snum || !(inet_test_bit(BIND_ADDRESS_NO_PORT, sk) || 537 (flags & BIND_FORCE_ADDRESS_NO_PORT))) { 538 err = sk->sk_prot->get_port(sk, snum); 539 if (err) { 540 inet->inet_saddr = inet->inet_rcv_saddr = 0; 541 goto out_release_sock; 542 } 543 if (!(flags & BIND_FROM_BPF)) { 544 err = BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk); 545 if (err) { 546 inet->inet_saddr = inet->inet_rcv_saddr = 0; 547 if (sk->sk_prot->put_port) 548 sk->sk_prot->put_port(sk); 549 goto out_release_sock; 550 } 551 } 552 } 553 554 if (inet->inet_rcv_saddr) 555 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 556 if (snum) 557 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 558 inet->inet_sport = htons(inet->inet_num); 559 inet->inet_daddr = 0; 560 inet->inet_dport = 0; 561 sk_dst_reset(sk); 562 err = 0; 563 out_release_sock: 564 if (flags & BIND_WITH_LOCK) 565 release_sock(sk); 566 out: 567 return err; 568 } 569 570 int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr, 571 int addr_len, int flags) 572 { 573 struct sock *sk = sock->sk; 574 const struct proto *prot; 575 int err; 576 577 if (addr_len < sizeof(uaddr->sa_family)) 578 return -EINVAL; 579 580 /* IPV6_ADDRFORM can change sk->sk_prot under us. */ 581 prot = READ_ONCE(sk->sk_prot); 582 583 if (uaddr->sa_family == AF_UNSPEC) 584 return prot->disconnect(sk, flags); 585 586 if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) { 587 err = prot->pre_connect(sk, uaddr, addr_len); 588 if (err) 589 return err; 590 } 591 592 if (data_race(!inet_sk(sk)->inet_num) && inet_autobind(sk)) 593 return -EAGAIN; 594 return prot->connect(sk, uaddr, addr_len); 595 } 596 EXPORT_SYMBOL(inet_dgram_connect); 597 598 static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias) 599 { 600 DEFINE_WAIT_FUNC(wait, woken_wake_function); 601 602 add_wait_queue(sk_sleep(sk), &wait); 603 sk->sk_write_pending += writebias; 604 605 /* Basic assumption: if someone sets sk->sk_err, he _must_ 606 * change state of the socket from TCP_SYN_*. 607 * Connect() does not allow to get error notifications 608 * without closing the socket. 609 */ 610 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 611 release_sock(sk); 612 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo); 613 lock_sock(sk); 614 if (signal_pending(current) || !timeo) 615 break; 616 } 617 remove_wait_queue(sk_sleep(sk), &wait); 618 sk->sk_write_pending -= writebias; 619 return timeo; 620 } 621 622 /* 623 * Connect to a remote host. There is regrettably still a little 624 * TCP 'magic' in here. 625 */ 626 int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 627 int addr_len, int flags, int is_sendmsg) 628 { 629 struct sock *sk = sock->sk; 630 int err; 631 long timeo; 632 633 /* 634 * uaddr can be NULL and addr_len can be 0 if: 635 * sk is a TCP fastopen active socket and 636 * TCP_FASTOPEN_CONNECT sockopt is set and 637 * we already have a valid cookie for this socket. 638 * In this case, user can call write() after connect(). 639 * write() will invoke tcp_sendmsg_fastopen() which calls 640 * __inet_stream_connect(). 641 */ 642 if (uaddr) { 643 if (addr_len < sizeof(uaddr->sa_family)) 644 return -EINVAL; 645 646 if (uaddr->sa_family == AF_UNSPEC) { 647 sk->sk_disconnects++; 648 err = sk->sk_prot->disconnect(sk, flags); 649 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 650 goto out; 651 } 652 } 653 654 switch (sock->state) { 655 default: 656 err = -EINVAL; 657 goto out; 658 case SS_CONNECTED: 659 err = -EISCONN; 660 goto out; 661 case SS_CONNECTING: 662 if (inet_test_bit(DEFER_CONNECT, sk)) 663 err = is_sendmsg ? -EINPROGRESS : -EISCONN; 664 else 665 err = -EALREADY; 666 /* Fall out of switch with err, set for this state */ 667 break; 668 case SS_UNCONNECTED: 669 err = -EISCONN; 670 if (sk->sk_state != TCP_CLOSE) 671 goto out; 672 673 if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) { 674 err = sk->sk_prot->pre_connect(sk, uaddr, addr_len); 675 if (err) 676 goto out; 677 } 678 679 err = sk->sk_prot->connect(sk, uaddr, addr_len); 680 if (err < 0) 681 goto out; 682 683 sock->state = SS_CONNECTING; 684 685 if (!err && inet_test_bit(DEFER_CONNECT, sk)) 686 goto out; 687 688 /* Just entered SS_CONNECTING state; the only 689 * difference is that return value in non-blocking 690 * case is EINPROGRESS, rather than EALREADY. 691 */ 692 err = -EINPROGRESS; 693 break; 694 } 695 696 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 697 698 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 699 int writebias = (sk->sk_protocol == IPPROTO_TCP) && 700 tcp_sk(sk)->fastopen_req && 701 tcp_sk(sk)->fastopen_req->data ? 1 : 0; 702 int dis = sk->sk_disconnects; 703 704 /* Error code is set above */ 705 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias)) 706 goto out; 707 708 err = sock_intr_errno(timeo); 709 if (signal_pending(current)) 710 goto out; 711 712 if (dis != sk->sk_disconnects) { 713 err = -EPIPE; 714 goto out; 715 } 716 } 717 718 /* Connection was closed by RST, timeout, ICMP error 719 * or another process disconnected us. 720 */ 721 if (sk->sk_state == TCP_CLOSE) 722 goto sock_error; 723 724 /* sk->sk_err may be not zero now, if RECVERR was ordered by user 725 * and error was received after socket entered established state. 726 * Hence, it is handled normally after connect() return successfully. 727 */ 728 729 sock->state = SS_CONNECTED; 730 err = 0; 731 out: 732 return err; 733 734 sock_error: 735 err = sock_error(sk) ? : -ECONNABORTED; 736 sock->state = SS_UNCONNECTED; 737 sk->sk_disconnects++; 738 if (sk->sk_prot->disconnect(sk, flags)) 739 sock->state = SS_DISCONNECTING; 740 goto out; 741 } 742 EXPORT_SYMBOL(__inet_stream_connect); 743 744 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 745 int addr_len, int flags) 746 { 747 int err; 748 749 lock_sock(sock->sk); 750 err = __inet_stream_connect(sock, uaddr, addr_len, flags, 0); 751 release_sock(sock->sk); 752 return err; 753 } 754 EXPORT_SYMBOL(inet_stream_connect); 755 756 void __inet_accept(struct socket *sock, struct socket *newsock, struct sock *newsk) 757 { 758 sock_rps_record_flow(newsk); 759 WARN_ON(!((1 << newsk->sk_state) & 760 (TCPF_ESTABLISHED | TCPF_SYN_RECV | 761 TCPF_FIN_WAIT1 | TCPF_FIN_WAIT2 | 762 TCPF_CLOSING | TCPF_CLOSE_WAIT | 763 TCPF_CLOSE))); 764 765 if (test_bit(SOCK_SUPPORT_ZC, &sock->flags)) 766 set_bit(SOCK_SUPPORT_ZC, &newsock->flags); 767 sock_graft(newsk, newsock); 768 769 newsock->state = SS_CONNECTED; 770 } 771 772 /* 773 * Accept a pending connection. The TCP layer now gives BSD semantics. 774 */ 775 776 int inet_accept(struct socket *sock, struct socket *newsock, 777 struct proto_accept_arg *arg) 778 { 779 struct sock *sk1 = sock->sk, *sk2; 780 781 /* IPV6_ADDRFORM can change sk->sk_prot under us. */ 782 arg->err = -EINVAL; 783 sk2 = READ_ONCE(sk1->sk_prot)->accept(sk1, arg); 784 if (!sk2) 785 return arg->err; 786 787 lock_sock(sk2); 788 __inet_accept(sock, newsock, sk2); 789 release_sock(sk2); 790 return 0; 791 } 792 EXPORT_SYMBOL(inet_accept); 793 794 /* 795 * This does both peername and sockname. 796 */ 797 int inet_getname(struct socket *sock, struct sockaddr *uaddr, 798 int peer) 799 { 800 struct sock *sk = sock->sk; 801 struct inet_sock *inet = inet_sk(sk); 802 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr); 803 int sin_addr_len = sizeof(*sin); 804 805 sin->sin_family = AF_INET; 806 lock_sock(sk); 807 if (peer) { 808 if (!inet->inet_dport || 809 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 810 peer == 1)) { 811 release_sock(sk); 812 return -ENOTCONN; 813 } 814 sin->sin_port = inet->inet_dport; 815 sin->sin_addr.s_addr = inet->inet_daddr; 816 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin, &sin_addr_len, 817 CGROUP_INET4_GETPEERNAME); 818 } else { 819 __be32 addr = inet->inet_rcv_saddr; 820 if (!addr) 821 addr = inet->inet_saddr; 822 sin->sin_port = inet->inet_sport; 823 sin->sin_addr.s_addr = addr; 824 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin, &sin_addr_len, 825 CGROUP_INET4_GETSOCKNAME); 826 } 827 release_sock(sk); 828 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 829 return sin_addr_len; 830 } 831 EXPORT_SYMBOL(inet_getname); 832 833 int inet_send_prepare(struct sock *sk) 834 { 835 sock_rps_record_flow(sk); 836 837 /* We may need to bind the socket. */ 838 if (data_race(!inet_sk(sk)->inet_num) && !sk->sk_prot->no_autobind && 839 inet_autobind(sk)) 840 return -EAGAIN; 841 842 return 0; 843 } 844 EXPORT_SYMBOL_GPL(inet_send_prepare); 845 846 int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) 847 { 848 struct sock *sk = sock->sk; 849 850 if (unlikely(inet_send_prepare(sk))) 851 return -EAGAIN; 852 853 return INDIRECT_CALL_2(sk->sk_prot->sendmsg, tcp_sendmsg, udp_sendmsg, 854 sk, msg, size); 855 } 856 EXPORT_SYMBOL(inet_sendmsg); 857 858 void inet_splice_eof(struct socket *sock) 859 { 860 const struct proto *prot; 861 struct sock *sk = sock->sk; 862 863 if (unlikely(inet_send_prepare(sk))) 864 return; 865 866 /* IPV6_ADDRFORM can change sk->sk_prot under us. */ 867 prot = READ_ONCE(sk->sk_prot); 868 if (prot->splice_eof) 869 prot->splice_eof(sock); 870 } 871 EXPORT_SYMBOL_GPL(inet_splice_eof); 872 873 INDIRECT_CALLABLE_DECLARE(int udp_recvmsg(struct sock *, struct msghdr *, 874 size_t, int, int *)); 875 int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 876 int flags) 877 { 878 struct sock *sk = sock->sk; 879 int addr_len = 0; 880 int err; 881 882 if (likely(!(flags & MSG_ERRQUEUE))) 883 sock_rps_record_flow(sk); 884 885 err = INDIRECT_CALL_2(sk->sk_prot->recvmsg, tcp_recvmsg, udp_recvmsg, 886 sk, msg, size, flags, &addr_len); 887 if (err >= 0) 888 msg->msg_namelen = addr_len; 889 return err; 890 } 891 EXPORT_SYMBOL(inet_recvmsg); 892 893 int inet_shutdown(struct socket *sock, int how) 894 { 895 struct sock *sk = sock->sk; 896 int err = 0; 897 898 /* This should really check to make sure 899 * the socket is a TCP socket. (WHY AC...) 900 */ 901 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and 902 1->2 bit 2 snds. 903 2->3 */ 904 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ 905 return -EINVAL; 906 907 lock_sock(sk); 908 if (sock->state == SS_CONNECTING) { 909 if ((1 << sk->sk_state) & 910 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) 911 sock->state = SS_DISCONNECTING; 912 else 913 sock->state = SS_CONNECTED; 914 } 915 916 switch (sk->sk_state) { 917 case TCP_CLOSE: 918 err = -ENOTCONN; 919 /* Hack to wake up other listeners, who can poll for 920 EPOLLHUP, even on eg. unconnected UDP sockets -- RR */ 921 fallthrough; 922 default: 923 WRITE_ONCE(sk->sk_shutdown, sk->sk_shutdown | how); 924 if (sk->sk_prot->shutdown) 925 sk->sk_prot->shutdown(sk, how); 926 break; 927 928 /* Remaining two branches are temporary solution for missing 929 * close() in multithreaded environment. It is _not_ a good idea, 930 * but we have no choice until close() is repaired at VFS level. 931 */ 932 case TCP_LISTEN: 933 if (!(how & RCV_SHUTDOWN)) 934 break; 935 fallthrough; 936 case TCP_SYN_SENT: 937 err = sk->sk_prot->disconnect(sk, O_NONBLOCK); 938 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 939 break; 940 } 941 942 /* Wake up anyone sleeping in poll. */ 943 sk->sk_state_change(sk); 944 release_sock(sk); 945 return err; 946 } 947 EXPORT_SYMBOL(inet_shutdown); 948 949 /* 950 * ioctl() calls you can issue on an INET socket. Most of these are 951 * device configuration and stuff and very rarely used. Some ioctls 952 * pass on to the socket itself. 953 * 954 * NOTE: I like the idea of a module for the config stuff. ie ifconfig 955 * loads the devconfigure module does its configuring and unloads it. 956 * There's a good 20K of config code hanging around the kernel. 957 */ 958 959 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 960 { 961 struct sock *sk = sock->sk; 962 int err = 0; 963 struct net *net = sock_net(sk); 964 void __user *p = (void __user *)arg; 965 struct ifreq ifr; 966 struct rtentry rt; 967 968 switch (cmd) { 969 case SIOCADDRT: 970 case SIOCDELRT: 971 if (copy_from_user(&rt, p, sizeof(struct rtentry))) 972 return -EFAULT; 973 err = ip_rt_ioctl(net, cmd, &rt); 974 break; 975 case SIOCRTMSG: 976 err = -EINVAL; 977 break; 978 case SIOCDARP: 979 case SIOCGARP: 980 case SIOCSARP: 981 err = arp_ioctl(net, cmd, (void __user *)arg); 982 break; 983 case SIOCGIFADDR: 984 case SIOCGIFBRDADDR: 985 case SIOCGIFNETMASK: 986 case SIOCGIFDSTADDR: 987 case SIOCGIFPFLAGS: 988 if (get_user_ifreq(&ifr, NULL, p)) 989 return -EFAULT; 990 err = devinet_ioctl(net, cmd, &ifr); 991 if (!err && put_user_ifreq(&ifr, p)) 992 err = -EFAULT; 993 break; 994 995 case SIOCSIFADDR: 996 case SIOCSIFBRDADDR: 997 case SIOCSIFNETMASK: 998 case SIOCSIFDSTADDR: 999 case SIOCSIFPFLAGS: 1000 case SIOCSIFFLAGS: 1001 if (get_user_ifreq(&ifr, NULL, p)) 1002 return -EFAULT; 1003 err = devinet_ioctl(net, cmd, &ifr); 1004 break; 1005 default: 1006 if (sk->sk_prot->ioctl) 1007 err = sk_ioctl(sk, cmd, (void __user *)arg); 1008 else 1009 err = -ENOIOCTLCMD; 1010 break; 1011 } 1012 return err; 1013 } 1014 EXPORT_SYMBOL(inet_ioctl); 1015 1016 #ifdef CONFIG_COMPAT 1017 static int inet_compat_routing_ioctl(struct sock *sk, unsigned int cmd, 1018 struct compat_rtentry __user *ur) 1019 { 1020 compat_uptr_t rtdev; 1021 struct rtentry rt; 1022 1023 if (copy_from_user(&rt.rt_dst, &ur->rt_dst, 1024 3 * sizeof(struct sockaddr)) || 1025 get_user(rt.rt_flags, &ur->rt_flags) || 1026 get_user(rt.rt_metric, &ur->rt_metric) || 1027 get_user(rt.rt_mtu, &ur->rt_mtu) || 1028 get_user(rt.rt_window, &ur->rt_window) || 1029 get_user(rt.rt_irtt, &ur->rt_irtt) || 1030 get_user(rtdev, &ur->rt_dev)) 1031 return -EFAULT; 1032 1033 rt.rt_dev = compat_ptr(rtdev); 1034 return ip_rt_ioctl(sock_net(sk), cmd, &rt); 1035 } 1036 1037 static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1038 { 1039 void __user *argp = compat_ptr(arg); 1040 struct sock *sk = sock->sk; 1041 1042 switch (cmd) { 1043 case SIOCADDRT: 1044 case SIOCDELRT: 1045 return inet_compat_routing_ioctl(sk, cmd, argp); 1046 default: 1047 if (!sk->sk_prot->compat_ioctl) 1048 return -ENOIOCTLCMD; 1049 return sk->sk_prot->compat_ioctl(sk, cmd, arg); 1050 } 1051 } 1052 #endif /* CONFIG_COMPAT */ 1053 1054 const struct proto_ops inet_stream_ops = { 1055 .family = PF_INET, 1056 .owner = THIS_MODULE, 1057 .release = inet_release, 1058 .bind = inet_bind, 1059 .connect = inet_stream_connect, 1060 .socketpair = sock_no_socketpair, 1061 .accept = inet_accept, 1062 .getname = inet_getname, 1063 .poll = tcp_poll, 1064 .ioctl = inet_ioctl, 1065 .gettstamp = sock_gettstamp, 1066 .listen = inet_listen, 1067 .shutdown = inet_shutdown, 1068 .setsockopt = sock_common_setsockopt, 1069 .getsockopt = sock_common_getsockopt, 1070 .sendmsg = inet_sendmsg, 1071 .recvmsg = inet_recvmsg, 1072 #ifdef CONFIG_MMU 1073 .mmap = tcp_mmap, 1074 #endif 1075 .splice_eof = inet_splice_eof, 1076 .splice_read = tcp_splice_read, 1077 .set_peek_off = sk_set_peek_off, 1078 .read_sock = tcp_read_sock, 1079 .read_skb = tcp_read_skb, 1080 .sendmsg_locked = tcp_sendmsg_locked, 1081 .peek_len = tcp_peek_len, 1082 #ifdef CONFIG_COMPAT 1083 .compat_ioctl = inet_compat_ioctl, 1084 #endif 1085 .set_rcvlowat = tcp_set_rcvlowat, 1086 }; 1087 EXPORT_SYMBOL(inet_stream_ops); 1088 1089 const struct proto_ops inet_dgram_ops = { 1090 .family = PF_INET, 1091 .owner = THIS_MODULE, 1092 .release = inet_release, 1093 .bind = inet_bind, 1094 .connect = inet_dgram_connect, 1095 .socketpair = sock_no_socketpair, 1096 .accept = sock_no_accept, 1097 .getname = inet_getname, 1098 .poll = udp_poll, 1099 .ioctl = inet_ioctl, 1100 .gettstamp = sock_gettstamp, 1101 .listen = sock_no_listen, 1102 .shutdown = inet_shutdown, 1103 .setsockopt = sock_common_setsockopt, 1104 .getsockopt = sock_common_getsockopt, 1105 .sendmsg = inet_sendmsg, 1106 .read_skb = udp_read_skb, 1107 .recvmsg = inet_recvmsg, 1108 .mmap = sock_no_mmap, 1109 .splice_eof = inet_splice_eof, 1110 .set_peek_off = udp_set_peek_off, 1111 #ifdef CONFIG_COMPAT 1112 .compat_ioctl = inet_compat_ioctl, 1113 #endif 1114 }; 1115 EXPORT_SYMBOL(inet_dgram_ops); 1116 1117 /* 1118 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 1119 * udp_poll 1120 */ 1121 static const struct proto_ops inet_sockraw_ops = { 1122 .family = PF_INET, 1123 .owner = THIS_MODULE, 1124 .release = inet_release, 1125 .bind = inet_bind, 1126 .connect = inet_dgram_connect, 1127 .socketpair = sock_no_socketpair, 1128 .accept = sock_no_accept, 1129 .getname = inet_getname, 1130 .poll = datagram_poll, 1131 .ioctl = inet_ioctl, 1132 .gettstamp = sock_gettstamp, 1133 .listen = sock_no_listen, 1134 .shutdown = inet_shutdown, 1135 .setsockopt = sock_common_setsockopt, 1136 .getsockopt = sock_common_getsockopt, 1137 .sendmsg = inet_sendmsg, 1138 .recvmsg = inet_recvmsg, 1139 .mmap = sock_no_mmap, 1140 .splice_eof = inet_splice_eof, 1141 #ifdef CONFIG_COMPAT 1142 .compat_ioctl = inet_compat_ioctl, 1143 #endif 1144 }; 1145 1146 static const struct net_proto_family inet_family_ops = { 1147 .family = PF_INET, 1148 .create = inet_create, 1149 .owner = THIS_MODULE, 1150 }; 1151 1152 /* Upon startup we insert all the elements in inetsw_array[] into 1153 * the linked list inetsw. 1154 */ 1155 static struct inet_protosw inetsw_array[] = 1156 { 1157 { 1158 .type = SOCK_STREAM, 1159 .protocol = IPPROTO_TCP, 1160 .prot = &tcp_prot, 1161 .ops = &inet_stream_ops, 1162 .flags = INET_PROTOSW_PERMANENT | 1163 INET_PROTOSW_ICSK, 1164 }, 1165 1166 { 1167 .type = SOCK_DGRAM, 1168 .protocol = IPPROTO_UDP, 1169 .prot = &udp_prot, 1170 .ops = &inet_dgram_ops, 1171 .flags = INET_PROTOSW_PERMANENT, 1172 }, 1173 1174 { 1175 .type = SOCK_DGRAM, 1176 .protocol = IPPROTO_ICMP, 1177 .prot = &ping_prot, 1178 .ops = &inet_sockraw_ops, 1179 .flags = INET_PROTOSW_REUSE, 1180 }, 1181 1182 { 1183 .type = SOCK_RAW, 1184 .protocol = IPPROTO_IP, /* wild card */ 1185 .prot = &raw_prot, 1186 .ops = &inet_sockraw_ops, 1187 .flags = INET_PROTOSW_REUSE, 1188 } 1189 }; 1190 1191 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) 1192 1193 void inet_register_protosw(struct inet_protosw *p) 1194 { 1195 struct list_head *lh; 1196 struct inet_protosw *answer; 1197 int protocol = p->protocol; 1198 struct list_head *last_perm; 1199 1200 spin_lock_bh(&inetsw_lock); 1201 1202 if (p->type >= SOCK_MAX) 1203 goto out_illegal; 1204 1205 /* If we are trying to override a permanent protocol, bail. */ 1206 last_perm = &inetsw[p->type]; 1207 list_for_each(lh, &inetsw[p->type]) { 1208 answer = list_entry(lh, struct inet_protosw, list); 1209 /* Check only the non-wild match. */ 1210 if ((INET_PROTOSW_PERMANENT & answer->flags) == 0) 1211 break; 1212 if (protocol == answer->protocol) 1213 goto out_permanent; 1214 last_perm = lh; 1215 } 1216 1217 /* Add the new entry after the last permanent entry if any, so that 1218 * the new entry does not override a permanent entry when matched with 1219 * a wild-card protocol. But it is allowed to override any existing 1220 * non-permanent entry. This means that when we remove this entry, the 1221 * system automatically returns to the old behavior. 1222 */ 1223 list_add_rcu(&p->list, last_perm); 1224 out: 1225 spin_unlock_bh(&inetsw_lock); 1226 1227 return; 1228 1229 out_permanent: 1230 pr_err("Attempt to override permanent protocol %d\n", protocol); 1231 goto out; 1232 1233 out_illegal: 1234 pr_err("Ignoring attempt to register invalid socket type %d\n", 1235 p->type); 1236 goto out; 1237 } 1238 EXPORT_SYMBOL(inet_register_protosw); 1239 1240 void inet_unregister_protosw(struct inet_protosw *p) 1241 { 1242 if (INET_PROTOSW_PERMANENT & p->flags) { 1243 pr_err("Attempt to unregister permanent protocol %d\n", 1244 p->protocol); 1245 } else { 1246 spin_lock_bh(&inetsw_lock); 1247 list_del_rcu(&p->list); 1248 spin_unlock_bh(&inetsw_lock); 1249 1250 synchronize_net(); 1251 } 1252 } 1253 EXPORT_SYMBOL(inet_unregister_protosw); 1254 1255 static int inet_sk_reselect_saddr(struct sock *sk) 1256 { 1257 struct inet_sock *inet = inet_sk(sk); 1258 __be32 old_saddr = inet->inet_saddr; 1259 __be32 daddr = inet->inet_daddr; 1260 struct flowi4 *fl4; 1261 struct rtable *rt; 1262 __be32 new_saddr; 1263 struct ip_options_rcu *inet_opt; 1264 int err; 1265 1266 inet_opt = rcu_dereference_protected(inet->inet_opt, 1267 lockdep_sock_is_held(sk)); 1268 if (inet_opt && inet_opt->opt.srr) 1269 daddr = inet_opt->opt.faddr; 1270 1271 /* Query new route. */ 1272 fl4 = &inet->cork.fl.u.ip4; 1273 rt = ip_route_connect(fl4, daddr, 0, sk->sk_bound_dev_if, 1274 sk->sk_protocol, inet->inet_sport, 1275 inet->inet_dport, sk); 1276 if (IS_ERR(rt)) 1277 return PTR_ERR(rt); 1278 1279 new_saddr = fl4->saddr; 1280 1281 if (new_saddr == old_saddr) { 1282 sk_setup_caps(sk, &rt->dst); 1283 return 0; 1284 } 1285 1286 err = inet_bhash2_update_saddr(sk, &new_saddr, AF_INET); 1287 if (err) { 1288 ip_rt_put(rt); 1289 return err; 1290 } 1291 1292 sk_setup_caps(sk, &rt->dst); 1293 1294 if (READ_ONCE(sock_net(sk)->ipv4.sysctl_ip_dynaddr) > 1) { 1295 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n", 1296 __func__, &old_saddr, &new_saddr); 1297 } 1298 1299 /* 1300 * XXX The only one ugly spot where we need to 1301 * XXX really change the sockets identity after 1302 * XXX it has entered the hashes. -DaveM 1303 * 1304 * Besides that, it does not check for connection 1305 * uniqueness. Wait for troubles. 1306 */ 1307 return __sk_prot_rehash(sk); 1308 } 1309 1310 int inet_sk_rebuild_header(struct sock *sk) 1311 { 1312 struct rtable *rt = dst_rtable(__sk_dst_check(sk, 0)); 1313 struct inet_sock *inet = inet_sk(sk); 1314 __be32 daddr; 1315 struct ip_options_rcu *inet_opt; 1316 struct flowi4 *fl4; 1317 int err; 1318 1319 /* Route is OK, nothing to do. */ 1320 if (rt) 1321 return 0; 1322 1323 /* Reroute. */ 1324 rcu_read_lock(); 1325 inet_opt = rcu_dereference(inet->inet_opt); 1326 daddr = inet->inet_daddr; 1327 if (inet_opt && inet_opt->opt.srr) 1328 daddr = inet_opt->opt.faddr; 1329 rcu_read_unlock(); 1330 fl4 = &inet->cork.fl.u.ip4; 1331 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr, 1332 inet->inet_dport, inet->inet_sport, 1333 sk->sk_protocol, ip_sock_rt_tos(sk), 1334 sk->sk_bound_dev_if); 1335 if (!IS_ERR(rt)) { 1336 err = 0; 1337 sk_setup_caps(sk, &rt->dst); 1338 } else { 1339 err = PTR_ERR(rt); 1340 1341 /* Routing failed... */ 1342 sk->sk_route_caps = 0; 1343 /* 1344 * Other protocols have to map its equivalent state to TCP_SYN_SENT. 1345 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme 1346 */ 1347 if (!READ_ONCE(sock_net(sk)->ipv4.sysctl_ip_dynaddr) || 1348 sk->sk_state != TCP_SYN_SENT || 1349 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 1350 (err = inet_sk_reselect_saddr(sk)) != 0) 1351 WRITE_ONCE(sk->sk_err_soft, -err); 1352 } 1353 1354 return err; 1355 } 1356 EXPORT_SYMBOL(inet_sk_rebuild_header); 1357 1358 void inet_sk_set_state(struct sock *sk, int state) 1359 { 1360 trace_inet_sock_set_state(sk, sk->sk_state, state); 1361 sk->sk_state = state; 1362 } 1363 EXPORT_SYMBOL(inet_sk_set_state); 1364 1365 void inet_sk_state_store(struct sock *sk, int newstate) 1366 { 1367 trace_inet_sock_set_state(sk, sk->sk_state, newstate); 1368 smp_store_release(&sk->sk_state, newstate); 1369 } 1370 1371 struct sk_buff *inet_gso_segment(struct sk_buff *skb, 1372 netdev_features_t features) 1373 { 1374 bool udpfrag = false, fixedid = false, gso_partial, encap; 1375 struct sk_buff *segs = ERR_PTR(-EINVAL); 1376 const struct net_offload *ops; 1377 unsigned int offset = 0; 1378 struct iphdr *iph; 1379 int proto, tot_len; 1380 int nhoff; 1381 int ihl; 1382 int id; 1383 1384 skb_reset_network_header(skb); 1385 nhoff = skb_network_header(skb) - skb_mac_header(skb); 1386 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1387 goto out; 1388 1389 iph = ip_hdr(skb); 1390 ihl = iph->ihl * 4; 1391 if (ihl < sizeof(*iph)) 1392 goto out; 1393 1394 id = ntohs(iph->id); 1395 proto = iph->protocol; 1396 1397 /* Warning: after this point, iph might be no longer valid */ 1398 if (unlikely(!pskb_may_pull(skb, ihl))) 1399 goto out; 1400 __skb_pull(skb, ihl); 1401 1402 encap = SKB_GSO_CB(skb)->encap_level > 0; 1403 if (encap) 1404 features &= skb->dev->hw_enc_features; 1405 SKB_GSO_CB(skb)->encap_level += ihl; 1406 1407 skb_reset_transport_header(skb); 1408 1409 segs = ERR_PTR(-EPROTONOSUPPORT); 1410 1411 if (!skb->encapsulation || encap) { 1412 udpfrag = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP); 1413 fixedid = !!(skb_shinfo(skb)->gso_type & SKB_GSO_TCP_FIXEDID); 1414 1415 /* fixed ID is invalid if DF bit is not set */ 1416 if (fixedid && !(ip_hdr(skb)->frag_off & htons(IP_DF))) 1417 goto out; 1418 } 1419 1420 ops = rcu_dereference(inet_offloads[proto]); 1421 if (likely(ops && ops->callbacks.gso_segment)) { 1422 segs = ops->callbacks.gso_segment(skb, features); 1423 if (!segs) 1424 skb->network_header = skb_mac_header(skb) + nhoff - skb->head; 1425 } 1426 1427 if (IS_ERR_OR_NULL(segs)) 1428 goto out; 1429 1430 gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL); 1431 1432 skb = segs; 1433 do { 1434 iph = (struct iphdr *)(skb_mac_header(skb) + nhoff); 1435 if (udpfrag) { 1436 iph->frag_off = htons(offset >> 3); 1437 if (skb->next) 1438 iph->frag_off |= htons(IP_MF); 1439 offset += skb->len - nhoff - ihl; 1440 tot_len = skb->len - nhoff; 1441 } else if (skb_is_gso(skb)) { 1442 if (!fixedid) { 1443 iph->id = htons(id); 1444 id += skb_shinfo(skb)->gso_segs; 1445 } 1446 1447 if (gso_partial) 1448 tot_len = skb_shinfo(skb)->gso_size + 1449 SKB_GSO_CB(skb)->data_offset + 1450 skb->head - (unsigned char *)iph; 1451 else 1452 tot_len = skb->len - nhoff; 1453 } else { 1454 if (!fixedid) 1455 iph->id = htons(id++); 1456 tot_len = skb->len - nhoff; 1457 } 1458 iph->tot_len = htons(tot_len); 1459 ip_send_check(iph); 1460 if (encap) 1461 skb_reset_inner_headers(skb); 1462 skb->network_header = (u8 *)iph - skb->head; 1463 skb_reset_mac_len(skb); 1464 } while ((skb = skb->next)); 1465 1466 out: 1467 return segs; 1468 } 1469 1470 static struct sk_buff *ipip_gso_segment(struct sk_buff *skb, 1471 netdev_features_t features) 1472 { 1473 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_IPXIP4)) 1474 return ERR_PTR(-EINVAL); 1475 1476 return inet_gso_segment(skb, features); 1477 } 1478 1479 struct sk_buff *inet_gro_receive(struct list_head *head, struct sk_buff *skb) 1480 { 1481 const struct net_offload *ops; 1482 struct sk_buff *pp = NULL; 1483 const struct iphdr *iph; 1484 struct sk_buff *p; 1485 unsigned int hlen; 1486 unsigned int off; 1487 int flush = 1; 1488 int proto; 1489 1490 off = skb_gro_offset(skb); 1491 hlen = off + sizeof(*iph); 1492 iph = skb_gro_header(skb, hlen, off); 1493 if (unlikely(!iph)) 1494 goto out; 1495 1496 proto = iph->protocol; 1497 1498 ops = rcu_dereference(inet_offloads[proto]); 1499 if (!ops || !ops->callbacks.gro_receive) 1500 goto out; 1501 1502 if (*(u8 *)iph != 0x45) 1503 goto out; 1504 1505 if (ip_is_fragment(iph)) 1506 goto out; 1507 1508 if (unlikely(ip_fast_csum((u8 *)iph, 5))) 1509 goto out; 1510 1511 NAPI_GRO_CB(skb)->proto = proto; 1512 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (ntohl(*(__be32 *)&iph->id) & ~IP_DF)); 1513 1514 list_for_each_entry(p, head, list) { 1515 struct iphdr *iph2; 1516 1517 if (!NAPI_GRO_CB(p)->same_flow) 1518 continue; 1519 1520 iph2 = (struct iphdr *)(p->data + off); 1521 /* The above works because, with the exception of the top 1522 * (inner most) layer, we only aggregate pkts with the same 1523 * hdr length so all the hdrs we'll need to verify will start 1524 * at the same offset. 1525 */ 1526 if ((iph->protocol ^ iph2->protocol) | 1527 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) | 1528 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) { 1529 NAPI_GRO_CB(p)->same_flow = 0; 1530 continue; 1531 } 1532 } 1533 1534 NAPI_GRO_CB(skb)->flush |= flush; 1535 NAPI_GRO_CB(skb)->network_offsets[NAPI_GRO_CB(skb)->encap_mark] = off; 1536 1537 /* Note : No need to call skb_gro_postpull_rcsum() here, 1538 * as we already checked checksum over ipv4 header was 0 1539 */ 1540 skb_gro_pull(skb, sizeof(*iph)); 1541 skb_set_transport_header(skb, skb_gro_offset(skb)); 1542 1543 pp = indirect_call_gro_receive(tcp4_gro_receive, udp4_gro_receive, 1544 ops->callbacks.gro_receive, head, skb); 1545 1546 out: 1547 skb_gro_flush_final(skb, pp, flush); 1548 1549 return pp; 1550 } 1551 1552 static struct sk_buff *ipip_gro_receive(struct list_head *head, 1553 struct sk_buff *skb) 1554 { 1555 if (NAPI_GRO_CB(skb)->encap_mark) { 1556 NAPI_GRO_CB(skb)->flush = 1; 1557 return NULL; 1558 } 1559 1560 NAPI_GRO_CB(skb)->encap_mark = 1; 1561 1562 return inet_gro_receive(head, skb); 1563 } 1564 1565 #define SECONDS_PER_DAY 86400 1566 1567 /* inet_current_timestamp - Return IP network timestamp 1568 * 1569 * Return milliseconds since midnight in network byte order. 1570 */ 1571 __be32 inet_current_timestamp(void) 1572 { 1573 u32 secs; 1574 u32 msecs; 1575 struct timespec64 ts; 1576 1577 ktime_get_real_ts64(&ts); 1578 1579 /* Get secs since midnight. */ 1580 (void)div_u64_rem(ts.tv_sec, SECONDS_PER_DAY, &secs); 1581 /* Convert to msecs. */ 1582 msecs = secs * MSEC_PER_SEC; 1583 /* Convert nsec to msec. */ 1584 msecs += (u32)ts.tv_nsec / NSEC_PER_MSEC; 1585 1586 /* Convert to network byte order. */ 1587 return htonl(msecs); 1588 } 1589 EXPORT_SYMBOL(inet_current_timestamp); 1590 1591 int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 1592 { 1593 unsigned int family = READ_ONCE(sk->sk_family); 1594 1595 if (family == AF_INET) 1596 return ip_recv_error(sk, msg, len, addr_len); 1597 #if IS_ENABLED(CONFIG_IPV6) 1598 if (family == AF_INET6) 1599 return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len); 1600 #endif 1601 return -EINVAL; 1602 } 1603 EXPORT_SYMBOL(inet_recv_error); 1604 1605 int inet_gro_complete(struct sk_buff *skb, int nhoff) 1606 { 1607 struct iphdr *iph = (struct iphdr *)(skb->data + nhoff); 1608 const struct net_offload *ops; 1609 __be16 totlen = iph->tot_len; 1610 int proto = iph->protocol; 1611 int err = -ENOSYS; 1612 1613 if (skb->encapsulation) { 1614 skb_set_inner_protocol(skb, cpu_to_be16(ETH_P_IP)); 1615 skb_set_inner_network_header(skb, nhoff); 1616 } 1617 1618 iph_set_totlen(iph, skb->len - nhoff); 1619 csum_replace2(&iph->check, totlen, iph->tot_len); 1620 1621 ops = rcu_dereference(inet_offloads[proto]); 1622 if (WARN_ON(!ops || !ops->callbacks.gro_complete)) 1623 goto out; 1624 1625 /* Only need to add sizeof(*iph) to get to the next hdr below 1626 * because any hdr with option will have been flushed in 1627 * inet_gro_receive(). 1628 */ 1629 err = INDIRECT_CALL_2(ops->callbacks.gro_complete, 1630 tcp4_gro_complete, udp4_gro_complete, 1631 skb, nhoff + sizeof(*iph)); 1632 1633 out: 1634 return err; 1635 } 1636 1637 static int ipip_gro_complete(struct sk_buff *skb, int nhoff) 1638 { 1639 skb->encapsulation = 1; 1640 skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4; 1641 return inet_gro_complete(skb, nhoff); 1642 } 1643 1644 int inet_ctl_sock_create(struct sock **sk, unsigned short family, 1645 unsigned short type, unsigned char protocol, 1646 struct net *net) 1647 { 1648 struct socket *sock; 1649 int rc = sock_create_kern(net, family, type, protocol, &sock); 1650 1651 if (rc == 0) { 1652 *sk = sock->sk; 1653 (*sk)->sk_allocation = GFP_ATOMIC; 1654 (*sk)->sk_use_task_frag = false; 1655 /* 1656 * Unhash it so that IP input processing does not even see it, 1657 * we do not wish this socket to see incoming packets. 1658 */ 1659 (*sk)->sk_prot->unhash(*sk); 1660 } 1661 return rc; 1662 } 1663 EXPORT_SYMBOL_GPL(inet_ctl_sock_create); 1664 1665 unsigned long snmp_fold_field(void __percpu *mib, int offt) 1666 { 1667 unsigned long res = 0; 1668 int i; 1669 1670 for_each_possible_cpu(i) 1671 res += snmp_get_cpu_field(mib, i, offt); 1672 return res; 1673 } 1674 EXPORT_SYMBOL_GPL(snmp_fold_field); 1675 1676 #if BITS_PER_LONG==32 1677 1678 u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offt, 1679 size_t syncp_offset) 1680 { 1681 void *bhptr; 1682 struct u64_stats_sync *syncp; 1683 u64 v; 1684 unsigned int start; 1685 1686 bhptr = per_cpu_ptr(mib, cpu); 1687 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset); 1688 do { 1689 start = u64_stats_fetch_begin(syncp); 1690 v = *(((u64 *)bhptr) + offt); 1691 } while (u64_stats_fetch_retry(syncp, start)); 1692 1693 return v; 1694 } 1695 EXPORT_SYMBOL_GPL(snmp_get_cpu_field64); 1696 1697 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset) 1698 { 1699 u64 res = 0; 1700 int cpu; 1701 1702 for_each_possible_cpu(cpu) { 1703 res += snmp_get_cpu_field64(mib, cpu, offt, syncp_offset); 1704 } 1705 return res; 1706 } 1707 EXPORT_SYMBOL_GPL(snmp_fold_field64); 1708 #endif 1709 1710 #ifdef CONFIG_IP_MULTICAST 1711 static const struct net_protocol igmp_protocol = { 1712 .handler = igmp_rcv, 1713 }; 1714 #endif 1715 1716 static const struct net_protocol icmp_protocol = { 1717 .handler = icmp_rcv, 1718 .err_handler = icmp_err, 1719 .no_policy = 1, 1720 }; 1721 1722 static __net_init int ipv4_mib_init_net(struct net *net) 1723 { 1724 int i; 1725 1726 net->mib.tcp_statistics = alloc_percpu(struct tcp_mib); 1727 if (!net->mib.tcp_statistics) 1728 goto err_tcp_mib; 1729 net->mib.ip_statistics = alloc_percpu(struct ipstats_mib); 1730 if (!net->mib.ip_statistics) 1731 goto err_ip_mib; 1732 1733 for_each_possible_cpu(i) { 1734 struct ipstats_mib *af_inet_stats; 1735 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i); 1736 u64_stats_init(&af_inet_stats->syncp); 1737 } 1738 1739 net->mib.net_statistics = alloc_percpu(struct linux_mib); 1740 if (!net->mib.net_statistics) 1741 goto err_net_mib; 1742 net->mib.udp_statistics = alloc_percpu(struct udp_mib); 1743 if (!net->mib.udp_statistics) 1744 goto err_udp_mib; 1745 net->mib.udplite_statistics = alloc_percpu(struct udp_mib); 1746 if (!net->mib.udplite_statistics) 1747 goto err_udplite_mib; 1748 net->mib.icmp_statistics = alloc_percpu(struct icmp_mib); 1749 if (!net->mib.icmp_statistics) 1750 goto err_icmp_mib; 1751 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib), 1752 GFP_KERNEL); 1753 if (!net->mib.icmpmsg_statistics) 1754 goto err_icmpmsg_mib; 1755 1756 tcp_mib_init(net); 1757 return 0; 1758 1759 err_icmpmsg_mib: 1760 free_percpu(net->mib.icmp_statistics); 1761 err_icmp_mib: 1762 free_percpu(net->mib.udplite_statistics); 1763 err_udplite_mib: 1764 free_percpu(net->mib.udp_statistics); 1765 err_udp_mib: 1766 free_percpu(net->mib.net_statistics); 1767 err_net_mib: 1768 free_percpu(net->mib.ip_statistics); 1769 err_ip_mib: 1770 free_percpu(net->mib.tcp_statistics); 1771 err_tcp_mib: 1772 return -ENOMEM; 1773 } 1774 1775 static __net_exit void ipv4_mib_exit_net(struct net *net) 1776 { 1777 kfree(net->mib.icmpmsg_statistics); 1778 free_percpu(net->mib.icmp_statistics); 1779 free_percpu(net->mib.udplite_statistics); 1780 free_percpu(net->mib.udp_statistics); 1781 free_percpu(net->mib.net_statistics); 1782 free_percpu(net->mib.ip_statistics); 1783 free_percpu(net->mib.tcp_statistics); 1784 #ifdef CONFIG_MPTCP 1785 /* allocated on demand, see mptcp_init_sock() */ 1786 free_percpu(net->mib.mptcp_statistics); 1787 #endif 1788 } 1789 1790 static __net_initdata struct pernet_operations ipv4_mib_ops = { 1791 .init = ipv4_mib_init_net, 1792 .exit = ipv4_mib_exit_net, 1793 }; 1794 1795 static int __init init_ipv4_mibs(void) 1796 { 1797 return register_pernet_subsys(&ipv4_mib_ops); 1798 } 1799 1800 static __net_init int inet_init_net(struct net *net) 1801 { 1802 /* 1803 * Set defaults for local port range 1804 */ 1805 net->ipv4.ip_local_ports.range = 60999u << 16 | 32768u; 1806 1807 seqlock_init(&net->ipv4.ping_group_range.lock); 1808 /* 1809 * Sane defaults - nobody may create ping sockets. 1810 * Boot scripts should set this to distro-specific group. 1811 */ 1812 net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1); 1813 net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0); 1814 1815 /* Default values for sysctl-controlled parameters. 1816 * We set them here, in case sysctl is not compiled. 1817 */ 1818 net->ipv4.sysctl_ip_default_ttl = IPDEFTTL; 1819 net->ipv4.sysctl_ip_fwd_update_priority = 1; 1820 net->ipv4.sysctl_ip_dynaddr = 0; 1821 net->ipv4.sysctl_ip_early_demux = 1; 1822 net->ipv4.sysctl_udp_early_demux = 1; 1823 net->ipv4.sysctl_tcp_early_demux = 1; 1824 net->ipv4.sysctl_nexthop_compat_mode = 1; 1825 #ifdef CONFIG_SYSCTL 1826 net->ipv4.sysctl_ip_prot_sock = PROT_SOCK; 1827 #endif 1828 1829 /* Some igmp sysctl, whose values are always used */ 1830 net->ipv4.sysctl_igmp_max_memberships = 20; 1831 net->ipv4.sysctl_igmp_max_msf = 10; 1832 /* IGMP reports for link-local multicast groups are enabled by default */ 1833 net->ipv4.sysctl_igmp_llm_reports = 1; 1834 net->ipv4.sysctl_igmp_qrv = 2; 1835 1836 net->ipv4.sysctl_fib_notify_on_flag_change = 0; 1837 1838 return 0; 1839 } 1840 1841 static __net_initdata struct pernet_operations af_inet_ops = { 1842 .init = inet_init_net, 1843 }; 1844 1845 static int __init init_inet_pernet_ops(void) 1846 { 1847 return register_pernet_subsys(&af_inet_ops); 1848 } 1849 1850 static int ipv4_proc_init(void); 1851 1852 /* 1853 * IP protocol layer initialiser 1854 */ 1855 1856 1857 static const struct net_offload ipip_offload = { 1858 .callbacks = { 1859 .gso_segment = ipip_gso_segment, 1860 .gro_receive = ipip_gro_receive, 1861 .gro_complete = ipip_gro_complete, 1862 }, 1863 }; 1864 1865 static int __init ipip_offload_init(void) 1866 { 1867 return inet_add_offload(&ipip_offload, IPPROTO_IPIP); 1868 } 1869 1870 static int __init ipv4_offload_init(void) 1871 { 1872 /* 1873 * Add offloads 1874 */ 1875 if (udpv4_offload_init() < 0) 1876 pr_crit("%s: Cannot add UDP protocol offload\n", __func__); 1877 if (tcpv4_offload_init() < 0) 1878 pr_crit("%s: Cannot add TCP protocol offload\n", __func__); 1879 if (ipip_offload_init() < 0) 1880 pr_crit("%s: Cannot add IPIP protocol offload\n", __func__); 1881 1882 net_hotdata.ip_packet_offload = (struct packet_offload) { 1883 .type = cpu_to_be16(ETH_P_IP), 1884 .callbacks = { 1885 .gso_segment = inet_gso_segment, 1886 .gro_receive = inet_gro_receive, 1887 .gro_complete = inet_gro_complete, 1888 }, 1889 }; 1890 dev_add_offload(&net_hotdata.ip_packet_offload); 1891 return 0; 1892 } 1893 1894 fs_initcall(ipv4_offload_init); 1895 1896 static struct packet_type ip_packet_type __read_mostly = { 1897 .type = cpu_to_be16(ETH_P_IP), 1898 .func = ip_rcv, 1899 .list_func = ip_list_rcv, 1900 }; 1901 1902 static int __init inet_init(void) 1903 { 1904 struct inet_protosw *q; 1905 struct list_head *r; 1906 int rc; 1907 1908 sock_skb_cb_check_size(sizeof(struct inet_skb_parm)); 1909 1910 raw_hashinfo_init(&raw_v4_hashinfo); 1911 1912 rc = proto_register(&tcp_prot, 1); 1913 if (rc) 1914 goto out; 1915 1916 rc = proto_register(&udp_prot, 1); 1917 if (rc) 1918 goto out_unregister_tcp_proto; 1919 1920 rc = proto_register(&raw_prot, 1); 1921 if (rc) 1922 goto out_unregister_udp_proto; 1923 1924 rc = proto_register(&ping_prot, 1); 1925 if (rc) 1926 goto out_unregister_raw_proto; 1927 1928 /* 1929 * Tell SOCKET that we are alive... 1930 */ 1931 1932 (void)sock_register(&inet_family_ops); 1933 1934 #ifdef CONFIG_SYSCTL 1935 ip_static_sysctl_init(); 1936 #endif 1937 1938 /* 1939 * Add all the base protocols. 1940 */ 1941 1942 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 1943 pr_crit("%s: Cannot add ICMP protocol\n", __func__); 1944 1945 net_hotdata.udp_protocol = (struct net_protocol) { 1946 .handler = udp_rcv, 1947 .err_handler = udp_err, 1948 .no_policy = 1, 1949 }; 1950 if (inet_add_protocol(&net_hotdata.udp_protocol, IPPROTO_UDP) < 0) 1951 pr_crit("%s: Cannot add UDP protocol\n", __func__); 1952 1953 net_hotdata.tcp_protocol = (struct net_protocol) { 1954 .handler = tcp_v4_rcv, 1955 .err_handler = tcp_v4_err, 1956 .no_policy = 1, 1957 .icmp_strict_tag_validation = 1, 1958 }; 1959 if (inet_add_protocol(&net_hotdata.tcp_protocol, IPPROTO_TCP) < 0) 1960 pr_crit("%s: Cannot add TCP protocol\n", __func__); 1961 #ifdef CONFIG_IP_MULTICAST 1962 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 1963 pr_crit("%s: Cannot add IGMP protocol\n", __func__); 1964 #endif 1965 1966 /* Register the socket-side information for inet_create. */ 1967 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 1968 INIT_LIST_HEAD(r); 1969 1970 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 1971 inet_register_protosw(q); 1972 1973 /* 1974 * Set the ARP module up 1975 */ 1976 1977 arp_init(); 1978 1979 /* 1980 * Set the IP module up 1981 */ 1982 1983 ip_init(); 1984 1985 /* Initialise per-cpu ipv4 mibs */ 1986 if (init_ipv4_mibs()) 1987 panic("%s: Cannot init ipv4 mibs\n", __func__); 1988 1989 /* Setup TCP slab cache for open requests. */ 1990 tcp_init(); 1991 1992 /* Setup UDP memory threshold */ 1993 udp_init(); 1994 1995 /* Add UDP-Lite (RFC 3828) */ 1996 udplite4_register(); 1997 1998 raw_init(); 1999 2000 ping_init(); 2001 2002 /* 2003 * Set the ICMP layer up 2004 */ 2005 2006 if (icmp_init() < 0) 2007 panic("Failed to create the ICMP control socket.\n"); 2008 2009 /* 2010 * Initialise the multicast router 2011 */ 2012 #if defined(CONFIG_IP_MROUTE) 2013 if (ip_mr_init()) 2014 pr_crit("%s: Cannot init ipv4 mroute\n", __func__); 2015 #endif 2016 2017 if (init_inet_pernet_ops()) 2018 pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__); 2019 2020 ipv4_proc_init(); 2021 2022 ipfrag_init(); 2023 2024 dev_add_pack(&ip_packet_type); 2025 2026 ip_tunnel_core_init(); 2027 2028 rc = 0; 2029 out: 2030 return rc; 2031 out_unregister_raw_proto: 2032 proto_unregister(&raw_prot); 2033 out_unregister_udp_proto: 2034 proto_unregister(&udp_prot); 2035 out_unregister_tcp_proto: 2036 proto_unregister(&tcp_prot); 2037 goto out; 2038 } 2039 2040 fs_initcall(inet_init); 2041 2042 /* ------------------------------------------------------------------------ */ 2043 2044 #ifdef CONFIG_PROC_FS 2045 static int __init ipv4_proc_init(void) 2046 { 2047 int rc = 0; 2048 2049 if (raw_proc_init()) 2050 goto out_raw; 2051 if (tcp4_proc_init()) 2052 goto out_tcp; 2053 if (udp4_proc_init()) 2054 goto out_udp; 2055 if (ping_proc_init()) 2056 goto out_ping; 2057 if (ip_misc_proc_init()) 2058 goto out_misc; 2059 out: 2060 return rc; 2061 out_misc: 2062 ping_proc_exit(); 2063 out_ping: 2064 udp4_proc_exit(); 2065 out_udp: 2066 tcp4_proc_exit(); 2067 out_tcp: 2068 raw_proc_exit(); 2069 out_raw: 2070 rc = -ENOMEM; 2071 goto out; 2072 } 2073 2074 #else /* CONFIG_PROC_FS */ 2075 static int __init ipv4_proc_init(void) 2076 { 2077 return 0; 2078 } 2079 #endif /* CONFIG_PROC_FS */ 2080