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#ifdef CONFIG_LOWPOWER_PROTOCOL 121#include <net/lowpower_protocol.h> 122#endif /* CONFIG_LOWPOWER_PROTOCOL */ 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 */ 129static struct list_head inetsw[SOCK_MAX]; 130static DEFINE_SPINLOCK(inetsw_lock); 131 132/* New destruction routine */ 133 134void 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 if (sk->sk_rx_skb_cache) { 140 __kfree_skb(sk->sk_rx_skb_cache); 141 sk->sk_rx_skb_cache = NULL; 142 } 143 __skb_queue_purge(&sk->sk_error_queue); 144 145 sk_mem_reclaim(sk); 146 147 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) { 148 pr_err("Attempt to release TCP socket in state %d %p\n", 149 sk->sk_state, sk); 150 return; 151 } 152 if (!sock_flag(sk, SOCK_DEAD)) { 153 pr_err("Attempt to release alive inet socket %p\n", sk); 154 return; 155 } 156 157 WARN_ON(atomic_read(&sk->sk_rmem_alloc)); 158 WARN_ON(refcount_read(&sk->sk_wmem_alloc)); 159 WARN_ON(sk->sk_wmem_queued); 160 WARN_ON(sk->sk_forward_alloc); 161 162 kfree(rcu_dereference_protected(inet->inet_opt, 1)); 163 dst_release(rcu_dereference_protected(sk->sk_dst_cache, 1)); 164 dst_release(rcu_dereference_protected(sk->sk_rx_dst, 1)); 165 sk_refcnt_debug_dec(sk); 166} 167EXPORT_SYMBOL(inet_sock_destruct); 168 169/* 170 * The routines beyond this point handle the behaviour of an AF_INET 171 * socket object. Mostly it punts to the subprotocols of IP to do 172 * the work. 173 */ 174 175/* 176 * Automatically bind an unbound socket. 177 */ 178 179static int inet_autobind(struct sock *sk) 180{ 181 struct inet_sock *inet; 182 /* We may need to bind the socket. */ 183 lock_sock(sk); 184 inet = inet_sk(sk); 185 if (!inet->inet_num) { 186 if (sk->sk_prot->get_port(sk, 0)) { 187 release_sock(sk); 188 return -EAGAIN; 189 } 190 inet->inet_sport = htons(inet->inet_num); 191 } 192 release_sock(sk); 193 return 0; 194} 195 196/* 197 * Move a socket into listening state. 198 */ 199int inet_listen(struct socket *sock, int backlog) 200{ 201 struct sock *sk = sock->sk; 202 unsigned char old_state; 203 int err, tcp_fastopen; 204 205 lock_sock(sk); 206 207 err = -EINVAL; 208 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM) 209 goto out; 210 211 old_state = sk->sk_state; 212 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN))) 213 goto out; 214 215 WRITE_ONCE(sk->sk_max_ack_backlog, backlog); 216 /* Really, if the socket is already in listen state 217 * we can only allow the backlog to be adjusted. 218 */ 219 if (old_state != TCP_LISTEN) { 220 /* Enable TFO w/o requiring TCP_FASTOPEN socket option. 221 * Note that only TCP sockets (SOCK_STREAM) will reach here. 222 * Also fastopen backlog may already been set via the option 223 * because the socket was in TCP_LISTEN state previously but 224 * was shutdown() rather than close(). 225 */ 226 tcp_fastopen = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_fastopen); 227 if ((tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) && 228 (tcp_fastopen & TFO_SERVER_ENABLE) && 229 !inet_csk(sk)->icsk_accept_queue.fastopenq.max_qlen) { 230 fastopen_queue_tune(sk, backlog); 231 tcp_fastopen_init_key_once(sock_net(sk)); 232 } 233 234 err = inet_csk_listen_start(sk, backlog); 235 if (err) 236 goto out; 237 tcp_call_bpf(sk, BPF_SOCK_OPS_TCP_LISTEN_CB, 0, NULL); 238 } 239 err = 0; 240 241out: 242 release_sock(sk); 243 return err; 244} 245EXPORT_SYMBOL(inet_listen); 246 247/* 248 * Create an inet socket. 249 */ 250 251static int inet_create(struct net *net, struct socket *sock, int protocol, 252 int kern) 253{ 254 struct sock *sk; 255 struct inet_protosw *answer; 256 struct inet_sock *inet; 257 struct proto *answer_prot; 258 unsigned char answer_flags; 259 int try_loading_module = 0; 260 int err; 261 262 if (protocol < 0 || protocol >= IPPROTO_MAX) 263 return -EINVAL; 264 265 sock->state = SS_UNCONNECTED; 266 267 /* Look for the requested type/protocol pair. */ 268lookup_protocol: 269 err = -ESOCKTNOSUPPORT; 270 rcu_read_lock(); 271 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) { 272 273 err = 0; 274 /* Check the non-wild match. */ 275 if (protocol == answer->protocol) { 276 if (protocol != IPPROTO_IP) 277 break; 278 } else { 279 /* Check for the two wild cases. */ 280 if (IPPROTO_IP == protocol) { 281 protocol = answer->protocol; 282 break; 283 } 284 if (IPPROTO_IP == answer->protocol) 285 break; 286 } 287 err = -EPROTONOSUPPORT; 288 } 289 290 if (unlikely(err)) { 291 if (try_loading_module < 2) { 292 rcu_read_unlock(); 293 /* 294 * Be more specific, e.g. net-pf-2-proto-132-type-1 295 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) 296 */ 297 if (++try_loading_module == 1) 298 request_module("net-pf-%d-proto-%d-type-%d", 299 PF_INET, protocol, sock->type); 300 /* 301 * Fall back to generic, e.g. net-pf-2-proto-132 302 * (net-pf-PF_INET-proto-IPPROTO_SCTP) 303 */ 304 else 305 request_module("net-pf-%d-proto-%d", 306 PF_INET, protocol); 307 goto lookup_protocol; 308 } else 309 goto out_rcu_unlock; 310 } 311 312 err = -EPERM; 313 if (sock->type == SOCK_RAW && !kern && 314 !ns_capable(net->user_ns, CAP_NET_RAW)) 315 goto out_rcu_unlock; 316 317 sock->ops = answer->ops; 318 answer_prot = answer->prot; 319 answer_flags = answer->flags; 320 rcu_read_unlock(); 321 322 WARN_ON(!answer_prot->slab); 323 324 err = -ENOBUFS; 325 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot, kern); 326 if (!sk) 327 goto out; 328 329 err = 0; 330 if (INET_PROTOSW_REUSE & answer_flags) 331 sk->sk_reuse = SK_CAN_REUSE; 332 333 if (INET_PROTOSW_ICSK & answer_flags) 334 inet_init_csk_locks(sk); 335 336 inet = inet_sk(sk); 337 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 338 339 inet->nodefrag = 0; 340 341 if (SOCK_RAW == sock->type) { 342 inet->inet_num = protocol; 343 if (IPPROTO_RAW == protocol) 344 inet->hdrincl = 1; 345 } 346 347 if (READ_ONCE(net->ipv4.sysctl_ip_no_pmtu_disc)) 348 inet->pmtudisc = IP_PMTUDISC_DONT; 349 else 350 inet->pmtudisc = IP_PMTUDISC_WANT; 351 352 inet->inet_id = 0; 353 354 sock_init_data(sock, sk); 355 356 sk->sk_destruct = inet_sock_destruct; 357 sk->sk_protocol = protocol; 358 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 359 360 inet->uc_ttl = -1; 361 inet->mc_loop = 1; 362 inet->mc_ttl = 1; 363 inet->mc_all = 1; 364 inet->mc_index = 0; 365 inet->mc_list = NULL; 366 inet->rcv_tos = 0; 367 368 sk_refcnt_debug_inc(sk); 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 } 400out: 401 return err; 402out_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 */ 413int 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} 442EXPORT_SYMBOL(inet_release); 443 444int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 445{ 446 struct sock *sk = sock->sk; 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_INET4_BIND(sk, uaddr); 460 if (err) 461 return err; 462 463 return __inet_bind(sk, uaddr, addr_len, BIND_WITH_LOCK); 464} 465EXPORT_SYMBOL(inet_bind); 466 467int __inet_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len, 468 u32 flags) 469{ 470 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 471 struct inet_sock *inet = inet_sk(sk); 472 struct net *net = sock_net(sk); 473 unsigned short snum; 474 int chk_addr_ret; 475 u32 tb_id = RT_TABLE_LOCAL; 476 int err; 477 478 if (addr->sin_family != AF_INET) { 479 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET) 480 * only if s_addr is INADDR_ANY. 481 */ 482 err = -EAFNOSUPPORT; 483 if (addr->sin_family != AF_UNSPEC || 484 addr->sin_addr.s_addr != htonl(INADDR_ANY)) 485 goto out; 486 } 487 488 tb_id = l3mdev_fib_table_by_index(net, sk->sk_bound_dev_if) ? : tb_id; 489 chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id); 490 491 /* Not specified by any standard per-se, however it breaks too 492 * many applications when removed. It is unfortunate since 493 * allowing applications to make a non-local bind solves 494 * several problems with systems using dynamic addressing. 495 * (ie. your servers still start up even if your ISDN link 496 * is temporarily down) 497 */ 498 err = -EADDRNOTAVAIL; 499 if (!inet_can_nonlocal_bind(net, inet) && 500 addr->sin_addr.s_addr != htonl(INADDR_ANY) && 501 chk_addr_ret != RTN_LOCAL && 502 chk_addr_ret != RTN_MULTICAST && 503 chk_addr_ret != RTN_BROADCAST) 504 goto out; 505 506 snum = ntohs(addr->sin_port); 507 err = -EACCES; 508 if (snum && inet_port_requires_bind_service(net, snum) && 509 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 510 goto out; 511 512 /* We keep a pair of addresses. rcv_saddr is the one 513 * used by hash lookups, and saddr is used for transmit. 514 * 515 * In the BSD API these are the same except where it 516 * would be illegal to use them (multicast/broadcast) in 517 * which case the sending device address is used. 518 */ 519 if (flags & BIND_WITH_LOCK) 520 lock_sock(sk); 521 522 /* Check these errors (active socket, double bind). */ 523 err = -EINVAL; 524 if (sk->sk_state != TCP_CLOSE || inet->inet_num) 525 goto out_release_sock; 526 527 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 528 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 529 inet->inet_saddr = 0; /* Use device */ 530 531 /* Make sure we are allowed to bind here. */ 532 if (snum || !(inet->bind_address_no_port || 533 (flags & BIND_FORCE_ADDRESS_NO_PORT))) { 534 if (sk->sk_prot->get_port(sk, snum)) { 535 inet->inet_saddr = inet->inet_rcv_saddr = 0; 536 err = -EADDRINUSE; 537 goto out_release_sock; 538 } 539 if (!(flags & BIND_FROM_BPF)) { 540 err = BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk); 541 if (err) { 542 inet->inet_saddr = inet->inet_rcv_saddr = 0; 543 goto out_release_sock; 544 } 545 } 546 } 547 548 if (inet->inet_rcv_saddr) 549 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 550 if (snum) 551 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 552 inet->inet_sport = htons(inet->inet_num); 553 inet->inet_daddr = 0; 554 inet->inet_dport = 0; 555 sk_dst_reset(sk); 556 err = 0; 557out_release_sock: 558 if (flags & BIND_WITH_LOCK) 559 release_sock(sk); 560out: 561 return err; 562} 563 564int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr, 565 int addr_len, int flags) 566{ 567 struct sock *sk = sock->sk; 568 const struct proto *prot; 569 int err; 570 571 if (addr_len < sizeof(uaddr->sa_family)) 572 return -EINVAL; 573 574 /* IPV6_ADDRFORM can change sk->sk_prot under us. */ 575 prot = READ_ONCE(sk->sk_prot); 576 577 if (uaddr->sa_family == AF_UNSPEC) 578 return prot->disconnect(sk, flags); 579 580 if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) { 581 err = prot->pre_connect(sk, uaddr, addr_len); 582 if (err) 583 return err; 584 } 585 586 if (data_race(!inet_sk(sk)->inet_num) && inet_autobind(sk)) 587 return -EAGAIN; 588 return prot->connect(sk, uaddr, addr_len); 589} 590EXPORT_SYMBOL(inet_dgram_connect); 591 592static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias) 593{ 594 DEFINE_WAIT_FUNC(wait, woken_wake_function); 595 596 add_wait_queue(sk_sleep(sk), &wait); 597 sk->sk_write_pending += writebias; 598 sk->sk_wait_pending++; 599 600 /* Basic assumption: if someone sets sk->sk_err, he _must_ 601 * change state of the socket from TCP_SYN_*. 602 * Connect() does not allow to get error notifications 603 * without closing the socket. 604 */ 605 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 606 release_sock(sk); 607 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo); 608 lock_sock(sk); 609 if (signal_pending(current) || !timeo) 610 break; 611 } 612 remove_wait_queue(sk_sleep(sk), &wait); 613 sk->sk_write_pending -= writebias; 614 sk->sk_wait_pending--; 615 return timeo; 616} 617 618/* 619 * Connect to a remote host. There is regrettably still a little 620 * TCP 'magic' in here. 621 */ 622int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 623 int addr_len, int flags, int is_sendmsg) 624{ 625 struct sock *sk = sock->sk; 626 int err; 627 long timeo; 628 629 /* 630 * uaddr can be NULL and addr_len can be 0 if: 631 * sk is a TCP fastopen active socket and 632 * TCP_FASTOPEN_CONNECT sockopt is set and 633 * we already have a valid cookie for this socket. 634 * In this case, user can call write() after connect(). 635 * write() will invoke tcp_sendmsg_fastopen() which calls 636 * __inet_stream_connect(). 637 */ 638 if (uaddr) { 639 if (addr_len < sizeof(uaddr->sa_family)) 640 return -EINVAL; 641 642 if (uaddr->sa_family == AF_UNSPEC) { 643 err = sk->sk_prot->disconnect(sk, flags); 644 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 645 goto out; 646 } 647 } 648 649 switch (sock->state) { 650 default: 651 err = -EINVAL; 652 goto out; 653 case SS_CONNECTED: 654 err = -EISCONN; 655 goto out; 656 case SS_CONNECTING: 657 if (inet_sk(sk)->defer_connect) 658 err = is_sendmsg ? -EINPROGRESS : -EISCONN; 659 else 660 err = -EALREADY; 661 /* Fall out of switch with err, set for this state */ 662 break; 663 case SS_UNCONNECTED: 664 err = -EISCONN; 665 if (sk->sk_state != TCP_CLOSE) 666 goto out; 667 668 if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) { 669 err = sk->sk_prot->pre_connect(sk, uaddr, addr_len); 670 if (err) 671 goto out; 672 } 673 674 err = sk->sk_prot->connect(sk, uaddr, addr_len); 675 if (err < 0) 676 goto out; 677 678 sock->state = SS_CONNECTING; 679 680 if (!err && inet_sk(sk)->defer_connect) 681 goto out; 682 683 /* Just entered SS_CONNECTING state; the only 684 * difference is that return value in non-blocking 685 * case is EINPROGRESS, rather than EALREADY. 686 */ 687 err = -EINPROGRESS; 688 break; 689 } 690 691 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 692 693 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 694 int writebias = (sk->sk_protocol == IPPROTO_TCP) && 695 tcp_sk(sk)->fastopen_req && 696 tcp_sk(sk)->fastopen_req->data ? 1 : 0; 697 698 /* Error code is set above */ 699 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias)) 700 goto out; 701 702 err = sock_intr_errno(timeo); 703 if (signal_pending(current)) 704 goto out; 705 } 706 707 /* Connection was closed by RST, timeout, ICMP error 708 * or another process disconnected us. 709 */ 710 if (sk->sk_state == TCP_CLOSE) 711 goto sock_error; 712 713 /* sk->sk_err may be not zero now, if RECVERR was ordered by user 714 * and error was received after socket entered established state. 715 * Hence, it is handled normally after connect() return successfully. 716 */ 717 718 sock->state = SS_CONNECTED; 719 err = 0; 720out: 721 return err; 722 723sock_error: 724 err = sock_error(sk) ? : -ECONNABORTED; 725 sock->state = SS_UNCONNECTED; 726 if (sk->sk_prot->disconnect(sk, flags)) 727 sock->state = SS_DISCONNECTING; 728 goto out; 729} 730EXPORT_SYMBOL(__inet_stream_connect); 731 732int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 733 int addr_len, int flags) 734{ 735 int err; 736 737 lock_sock(sock->sk); 738 err = __inet_stream_connect(sock, uaddr, addr_len, flags, 0); 739 release_sock(sock->sk); 740 return err; 741} 742EXPORT_SYMBOL(inet_stream_connect); 743 744/* 745 * Accept a pending connection. The TCP layer now gives BSD semantics. 746 */ 747 748int inet_accept(struct socket *sock, struct socket *newsock, int flags, 749 bool kern) 750{ 751 struct sock *sk1 = sock->sk, *sk2; 752 int err = -EINVAL; 753 754 /* IPV6_ADDRFORM can change sk->sk_prot under us. */ 755 sk2 = READ_ONCE(sk1->sk_prot)->accept(sk1, flags, &err, kern); 756 if (!sk2) 757 goto do_err; 758 759 lock_sock(sk2); 760 761 sock_rps_record_flow(sk2); 762 WARN_ON(!((1 << sk2->sk_state) & 763 (TCPF_ESTABLISHED | TCPF_SYN_RECV | 764 TCPF_FIN_WAIT1 | TCPF_FIN_WAIT2 | 765 TCPF_CLOSING | TCPF_CLOSE_WAIT | 766 TCPF_CLOSE))); 767 768 sock_graft(sk2, newsock); 769 770 newsock->state = SS_CONNECTED; 771 err = 0; 772 release_sock(sk2); 773do_err: 774 return err; 775} 776EXPORT_SYMBOL(inet_accept); 777 778/* 779 * This does both peername and sockname. 780 */ 781int inet_getname(struct socket *sock, struct sockaddr *uaddr, 782 int peer) 783{ 784 struct sock *sk = sock->sk; 785 struct inet_sock *inet = inet_sk(sk); 786 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr); 787 788 sin->sin_family = AF_INET; 789 if (peer) { 790 if (!inet->inet_dport || 791 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 792 peer == 1)) 793 return -ENOTCONN; 794 sin->sin_port = inet->inet_dport; 795 sin->sin_addr.s_addr = inet->inet_daddr; 796 } else { 797 __be32 addr = inet->inet_rcv_saddr; 798 if (!addr) 799 addr = inet->inet_saddr; 800 sin->sin_port = inet->inet_sport; 801 sin->sin_addr.s_addr = addr; 802 } 803 if (cgroup_bpf_enabled) 804 BPF_CGROUP_RUN_SA_PROG_LOCK(sk, (struct sockaddr *)sin, 805 peer ? BPF_CGROUP_INET4_GETPEERNAME : 806 BPF_CGROUP_INET4_GETSOCKNAME, 807 NULL); 808 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 809 return sizeof(*sin); 810} 811EXPORT_SYMBOL(inet_getname); 812 813int inet_send_prepare(struct sock *sk) 814{ 815 sock_rps_record_flow(sk); 816 817 /* We may need to bind the socket. */ 818 if (data_race(!inet_sk(sk)->inet_num) && !sk->sk_prot->no_autobind && 819 inet_autobind(sk)) 820 return -EAGAIN; 821 822 return 0; 823} 824EXPORT_SYMBOL_GPL(inet_send_prepare); 825 826int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) 827{ 828 struct sock *sk = sock->sk; 829 830 if (unlikely(inet_send_prepare(sk))) 831 return -EAGAIN; 832 833 return INDIRECT_CALL_2(sk->sk_prot->sendmsg, tcp_sendmsg, udp_sendmsg, 834 sk, msg, size); 835} 836EXPORT_SYMBOL(inet_sendmsg); 837 838ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, 839 size_t size, int flags) 840{ 841 struct sock *sk = sock->sk; 842 const struct proto *prot; 843 844 if (unlikely(inet_send_prepare(sk))) 845 return -EAGAIN; 846 847 /* IPV6_ADDRFORM can change sk->sk_prot under us. */ 848 prot = READ_ONCE(sk->sk_prot); 849 if (prot->sendpage) 850 return prot->sendpage(sk, page, offset, size, flags); 851 return sock_no_sendpage(sock, page, offset, size, flags); 852} 853EXPORT_SYMBOL(inet_sendpage); 854 855INDIRECT_CALLABLE_DECLARE(int udp_recvmsg(struct sock *, struct msghdr *, 856 size_t, int, int, int *)); 857int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 858 int flags) 859{ 860 struct sock *sk = sock->sk; 861 int addr_len = 0; 862 int err; 863 864 if (likely(!(flags & MSG_ERRQUEUE))) 865 sock_rps_record_flow(sk); 866 867 err = INDIRECT_CALL_2(sk->sk_prot->recvmsg, tcp_recvmsg, udp_recvmsg, 868 sk, msg, size, flags & MSG_DONTWAIT, 869 flags & ~MSG_DONTWAIT, &addr_len); 870 if (err >= 0) 871 msg->msg_namelen = addr_len; 872 return err; 873} 874EXPORT_SYMBOL(inet_recvmsg); 875 876int inet_shutdown(struct socket *sock, int how) 877{ 878 struct sock *sk = sock->sk; 879 int err = 0; 880 881 /* This should really check to make sure 882 * the socket is a TCP socket. (WHY AC...) 883 */ 884 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and 885 1->2 bit 2 snds. 886 2->3 */ 887 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ 888 return -EINVAL; 889 890 lock_sock(sk); 891 if (sock->state == SS_CONNECTING) { 892 if ((1 << sk->sk_state) & 893 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) 894 sock->state = SS_DISCONNECTING; 895 else 896 sock->state = SS_CONNECTED; 897 } 898 899 switch (sk->sk_state) { 900 case TCP_CLOSE: 901 err = -ENOTCONN; 902 /* Hack to wake up other listeners, who can poll for 903 EPOLLHUP, even on eg. unconnected UDP sockets -- RR */ 904 fallthrough; 905 default: 906 WRITE_ONCE(sk->sk_shutdown, sk->sk_shutdown | how); 907 if (sk->sk_prot->shutdown) 908 sk->sk_prot->shutdown(sk, how); 909 break; 910 911 /* Remaining two branches are temporary solution for missing 912 * close() in multithreaded environment. It is _not_ a good idea, 913 * but we have no choice until close() is repaired at VFS level. 914 */ 915 case TCP_LISTEN: 916 if (!(how & RCV_SHUTDOWN)) 917 break; 918 fallthrough; 919 case TCP_SYN_SENT: 920 err = sk->sk_prot->disconnect(sk, O_NONBLOCK); 921 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 922 break; 923 } 924 925 /* Wake up anyone sleeping in poll. */ 926 sk->sk_state_change(sk); 927 release_sock(sk); 928 return err; 929} 930EXPORT_SYMBOL(inet_shutdown); 931 932/* 933 * ioctl() calls you can issue on an INET socket. Most of these are 934 * device configuration and stuff and very rarely used. Some ioctls 935 * pass on to the socket itself. 936 * 937 * NOTE: I like the idea of a module for the config stuff. ie ifconfig 938 * loads the devconfigure module does its configuring and unloads it. 939 * There's a good 20K of config code hanging around the kernel. 940 */ 941 942int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 943{ 944 struct sock *sk = sock->sk; 945 int err = 0; 946 struct net *net = sock_net(sk); 947 void __user *p = (void __user *)arg; 948 struct ifreq ifr; 949 struct rtentry rt; 950 951 switch (cmd) { 952 case SIOCADDRT: 953 case SIOCDELRT: 954 if (copy_from_user(&rt, p, sizeof(struct rtentry))) 955 return -EFAULT; 956 err = ip_rt_ioctl(net, cmd, &rt); 957 break; 958 case SIOCRTMSG: 959 err = -EINVAL; 960 break; 961 case SIOCDARP: 962 case SIOCGARP: 963 case SIOCSARP: 964 err = arp_ioctl(net, cmd, (void __user *)arg); 965 break; 966 case SIOCGIFADDR: 967 case SIOCGIFBRDADDR: 968 case SIOCGIFNETMASK: 969 case SIOCGIFDSTADDR: 970 case SIOCGIFPFLAGS: 971 if (copy_from_user(&ifr, p, sizeof(struct ifreq))) 972 return -EFAULT; 973 err = devinet_ioctl(net, cmd, &ifr); 974 if (!err && copy_to_user(p, &ifr, sizeof(struct ifreq))) 975 err = -EFAULT; 976 break; 977 978 case SIOCSIFADDR: 979 case SIOCSIFBRDADDR: 980 case SIOCSIFNETMASK: 981 case SIOCSIFDSTADDR: 982 case SIOCSIFPFLAGS: 983 case SIOCSIFFLAGS: 984 if (copy_from_user(&ifr, p, sizeof(struct ifreq))) 985 return -EFAULT; 986 err = devinet_ioctl(net, cmd, &ifr); 987 break; 988 default: 989 if (sk->sk_prot->ioctl) 990 err = sk->sk_prot->ioctl(sk, cmd, arg); 991 else 992 err = -ENOIOCTLCMD; 993 break; 994 } 995 return err; 996} 997EXPORT_SYMBOL(inet_ioctl); 998 999#ifdef CONFIG_COMPAT 1000static int inet_compat_routing_ioctl(struct sock *sk, unsigned int cmd, 1001 struct compat_rtentry __user *ur) 1002{ 1003 compat_uptr_t rtdev; 1004 struct rtentry rt; 1005 1006 if (copy_from_user(&rt.rt_dst, &ur->rt_dst, 1007 3 * sizeof(struct sockaddr)) || 1008 get_user(rt.rt_flags, &ur->rt_flags) || 1009 get_user(rt.rt_metric, &ur->rt_metric) || 1010 get_user(rt.rt_mtu, &ur->rt_mtu) || 1011 get_user(rt.rt_window, &ur->rt_window) || 1012 get_user(rt.rt_irtt, &ur->rt_irtt) || 1013 get_user(rtdev, &ur->rt_dev)) 1014 return -EFAULT; 1015 1016 rt.rt_dev = compat_ptr(rtdev); 1017 return ip_rt_ioctl(sock_net(sk), cmd, &rt); 1018} 1019 1020static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1021{ 1022 void __user *argp = compat_ptr(arg); 1023 struct sock *sk = sock->sk; 1024 1025 switch (cmd) { 1026 case SIOCADDRT: 1027 case SIOCDELRT: 1028 return inet_compat_routing_ioctl(sk, cmd, argp); 1029 default: 1030 if (!sk->sk_prot->compat_ioctl) 1031 return -ENOIOCTLCMD; 1032 return sk->sk_prot->compat_ioctl(sk, cmd, arg); 1033 } 1034} 1035#endif /* CONFIG_COMPAT */ 1036 1037const struct proto_ops inet_stream_ops = { 1038 .family = PF_INET, 1039 .owner = THIS_MODULE, 1040 .release = inet_release, 1041 .bind = inet_bind, 1042 .connect = inet_stream_connect, 1043 .socketpair = sock_no_socketpair, 1044 .accept = inet_accept, 1045 .getname = inet_getname, 1046 .poll = tcp_poll, 1047 .ioctl = inet_ioctl, 1048 .gettstamp = sock_gettstamp, 1049 .listen = inet_listen, 1050 .shutdown = inet_shutdown, 1051 .setsockopt = sock_common_setsockopt, 1052 .getsockopt = sock_common_getsockopt, 1053 .sendmsg = inet_sendmsg, 1054 .recvmsg = inet_recvmsg, 1055#ifdef CONFIG_MMU 1056 .mmap = tcp_mmap, 1057#endif 1058 .sendpage = inet_sendpage, 1059 .splice_read = tcp_splice_read, 1060 .read_sock = tcp_read_sock, 1061 .sendmsg_locked = tcp_sendmsg_locked, 1062 .sendpage_locked = tcp_sendpage_locked, 1063 .peek_len = tcp_peek_len, 1064#ifdef CONFIG_COMPAT 1065 .compat_ioctl = inet_compat_ioctl, 1066#endif 1067 .set_rcvlowat = tcp_set_rcvlowat, 1068}; 1069EXPORT_SYMBOL(inet_stream_ops); 1070 1071const struct proto_ops inet_dgram_ops = { 1072 .family = PF_INET, 1073 .owner = THIS_MODULE, 1074 .release = inet_release, 1075 .bind = inet_bind, 1076 .connect = inet_dgram_connect, 1077 .socketpair = sock_no_socketpair, 1078 .accept = sock_no_accept, 1079 .getname = inet_getname, 1080 .poll = udp_poll, 1081 .ioctl = inet_ioctl, 1082 .gettstamp = sock_gettstamp, 1083 .listen = sock_no_listen, 1084 .shutdown = inet_shutdown, 1085 .setsockopt = sock_common_setsockopt, 1086 .getsockopt = sock_common_getsockopt, 1087 .sendmsg = inet_sendmsg, 1088 .recvmsg = inet_recvmsg, 1089 .mmap = sock_no_mmap, 1090 .sendpage = inet_sendpage, 1091 .set_peek_off = sk_set_peek_off, 1092#ifdef CONFIG_COMPAT 1093 .compat_ioctl = inet_compat_ioctl, 1094#endif 1095}; 1096EXPORT_SYMBOL(inet_dgram_ops); 1097 1098/* 1099 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 1100 * udp_poll 1101 */ 1102static const struct proto_ops inet_sockraw_ops = { 1103 .family = PF_INET, 1104 .owner = THIS_MODULE, 1105 .release = inet_release, 1106 .bind = inet_bind, 1107 .connect = inet_dgram_connect, 1108 .socketpair = sock_no_socketpair, 1109 .accept = sock_no_accept, 1110 .getname = inet_getname, 1111 .poll = datagram_poll, 1112 .ioctl = inet_ioctl, 1113 .gettstamp = sock_gettstamp, 1114 .listen = sock_no_listen, 1115 .shutdown = inet_shutdown, 1116 .setsockopt = sock_common_setsockopt, 1117 .getsockopt = sock_common_getsockopt, 1118 .sendmsg = inet_sendmsg, 1119 .recvmsg = inet_recvmsg, 1120 .mmap = sock_no_mmap, 1121 .sendpage = inet_sendpage, 1122#ifdef CONFIG_COMPAT 1123 .compat_ioctl = inet_compat_ioctl, 1124#endif 1125}; 1126 1127static const struct net_proto_family inet_family_ops = { 1128 .family = PF_INET, 1129 .create = inet_create, 1130 .owner = THIS_MODULE, 1131}; 1132 1133/* Upon startup we insert all the elements in inetsw_array[] into 1134 * the linked list inetsw. 1135 */ 1136static struct inet_protosw inetsw_array[] = 1137{ 1138 { 1139 .type = SOCK_STREAM, 1140 .protocol = IPPROTO_TCP, 1141 .prot = &tcp_prot, 1142 .ops = &inet_stream_ops, 1143 .flags = INET_PROTOSW_PERMANENT | 1144 INET_PROTOSW_ICSK, 1145 }, 1146 1147 { 1148 .type = SOCK_DGRAM, 1149 .protocol = IPPROTO_UDP, 1150 .prot = &udp_prot, 1151 .ops = &inet_dgram_ops, 1152 .flags = INET_PROTOSW_PERMANENT, 1153 }, 1154 1155 { 1156 .type = SOCK_DGRAM, 1157 .protocol = IPPROTO_ICMP, 1158 .prot = &ping_prot, 1159 .ops = &inet_sockraw_ops, 1160 .flags = INET_PROTOSW_REUSE, 1161 }, 1162 1163 { 1164 .type = SOCK_RAW, 1165 .protocol = IPPROTO_IP, /* wild card */ 1166 .prot = &raw_prot, 1167 .ops = &inet_sockraw_ops, 1168 .flags = INET_PROTOSW_REUSE, 1169 } 1170}; 1171 1172#define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) 1173 1174void inet_register_protosw(struct inet_protosw *p) 1175{ 1176 struct list_head *lh; 1177 struct inet_protosw *answer; 1178 int protocol = p->protocol; 1179 struct list_head *last_perm; 1180 1181 spin_lock_bh(&inetsw_lock); 1182 1183 if (p->type >= SOCK_MAX) 1184 goto out_illegal; 1185 1186 /* If we are trying to override a permanent protocol, bail. */ 1187 last_perm = &inetsw[p->type]; 1188 list_for_each(lh, &inetsw[p->type]) { 1189 answer = list_entry(lh, struct inet_protosw, list); 1190 /* Check only the non-wild match. */ 1191 if ((INET_PROTOSW_PERMANENT & answer->flags) == 0) 1192 break; 1193 if (protocol == answer->protocol) 1194 goto out_permanent; 1195 last_perm = lh; 1196 } 1197 1198 /* Add the new entry after the last permanent entry if any, so that 1199 * the new entry does not override a permanent entry when matched with 1200 * a wild-card protocol. But it is allowed to override any existing 1201 * non-permanent entry. This means that when we remove this entry, the 1202 * system automatically returns to the old behavior. 1203 */ 1204 list_add_rcu(&p->list, last_perm); 1205out: 1206 spin_unlock_bh(&inetsw_lock); 1207 1208 return; 1209 1210out_permanent: 1211 pr_err("Attempt to override permanent protocol %d\n", protocol); 1212 goto out; 1213 1214out_illegal: 1215 pr_err("Ignoring attempt to register invalid socket type %d\n", 1216 p->type); 1217 goto out; 1218} 1219EXPORT_SYMBOL(inet_register_protosw); 1220 1221void inet_unregister_protosw(struct inet_protosw *p) 1222{ 1223 if (INET_PROTOSW_PERMANENT & p->flags) { 1224 pr_err("Attempt to unregister permanent protocol %d\n", 1225 p->protocol); 1226 } else { 1227 spin_lock_bh(&inetsw_lock); 1228 list_del_rcu(&p->list); 1229 spin_unlock_bh(&inetsw_lock); 1230 1231 synchronize_net(); 1232 } 1233} 1234EXPORT_SYMBOL(inet_unregister_protosw); 1235 1236static int inet_sk_reselect_saddr(struct sock *sk) 1237{ 1238 struct inet_sock *inet = inet_sk(sk); 1239 __be32 old_saddr = inet->inet_saddr; 1240 __be32 daddr = inet->inet_daddr; 1241 struct flowi4 *fl4; 1242 struct rtable *rt; 1243 __be32 new_saddr; 1244 struct ip_options_rcu *inet_opt; 1245 1246 inet_opt = rcu_dereference_protected(inet->inet_opt, 1247 lockdep_sock_is_held(sk)); 1248 if (inet_opt && inet_opt->opt.srr) 1249 daddr = inet_opt->opt.faddr; 1250 1251 /* Query new route. */ 1252 fl4 = &inet->cork.fl.u.ip4; 1253 rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk), 1254 sk->sk_bound_dev_if, sk->sk_protocol, 1255 inet->inet_sport, inet->inet_dport, sk); 1256 if (IS_ERR(rt)) 1257 return PTR_ERR(rt); 1258 1259 sk_setup_caps(sk, &rt->dst); 1260 1261 new_saddr = fl4->saddr; 1262 1263 if (new_saddr == old_saddr) 1264 return 0; 1265 1266 if (READ_ONCE(sock_net(sk)->ipv4.sysctl_ip_dynaddr) > 1) { 1267 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n", 1268 __func__, &old_saddr, &new_saddr); 1269 } 1270 1271 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr; 1272 1273 /* 1274 * XXX The only one ugly spot where we need to 1275 * XXX really change the sockets identity after 1276 * XXX it has entered the hashes. -DaveM 1277 * 1278 * Besides that, it does not check for connection 1279 * uniqueness. Wait for troubles. 1280 */ 1281 return __sk_prot_rehash(sk); 1282} 1283 1284int inet_sk_rebuild_header(struct sock *sk) 1285{ 1286 struct inet_sock *inet = inet_sk(sk); 1287 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); 1288 __be32 daddr; 1289 struct ip_options_rcu *inet_opt; 1290 struct flowi4 *fl4; 1291 int err; 1292 1293 /* Route is OK, nothing to do. */ 1294 if (rt) 1295 return 0; 1296 1297 /* Reroute. */ 1298 rcu_read_lock(); 1299 inet_opt = rcu_dereference(inet->inet_opt); 1300 daddr = inet->inet_daddr; 1301 if (inet_opt && inet_opt->opt.srr) 1302 daddr = inet_opt->opt.faddr; 1303 rcu_read_unlock(); 1304 fl4 = &inet->cork.fl.u.ip4; 1305 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr, 1306 inet->inet_dport, inet->inet_sport, 1307 sk->sk_protocol, RT_CONN_FLAGS(sk), 1308 sk->sk_bound_dev_if); 1309 if (!IS_ERR(rt)) { 1310 err = 0; 1311 sk_setup_caps(sk, &rt->dst); 1312 } else { 1313 err = PTR_ERR(rt); 1314 1315 /* Routing failed... */ 1316 sk->sk_route_caps = 0; 1317 /* 1318 * Other protocols have to map its equivalent state to TCP_SYN_SENT. 1319 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme 1320 */ 1321 if (!READ_ONCE(sock_net(sk)->ipv4.sysctl_ip_dynaddr) || 1322 sk->sk_state != TCP_SYN_SENT || 1323 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 1324 (err = inet_sk_reselect_saddr(sk)) != 0) 1325 sk->sk_err_soft = -err; 1326 } 1327 1328 return err; 1329} 1330EXPORT_SYMBOL(inet_sk_rebuild_header); 1331 1332void inet_sk_set_state(struct sock *sk, int state) 1333{ 1334 trace_inet_sock_set_state(sk, sk->sk_state, state); 1335 sk->sk_state = state; 1336} 1337EXPORT_SYMBOL(inet_sk_set_state); 1338 1339void inet_sk_state_store(struct sock *sk, int newstate) 1340{ 1341 trace_inet_sock_set_state(sk, sk->sk_state, newstate); 1342 smp_store_release(&sk->sk_state, newstate); 1343} 1344 1345struct sk_buff *inet_gso_segment(struct sk_buff *skb, 1346 netdev_features_t features) 1347{ 1348 bool udpfrag = false, fixedid = false, gso_partial, encap; 1349 struct sk_buff *segs = ERR_PTR(-EINVAL); 1350 const struct net_offload *ops; 1351 unsigned int offset = 0; 1352 struct iphdr *iph; 1353 int proto, tot_len; 1354 int nhoff; 1355 int ihl; 1356 int id; 1357 1358 skb_reset_network_header(skb); 1359 nhoff = skb_network_header(skb) - skb_mac_header(skb); 1360 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1361 goto out; 1362 1363 iph = ip_hdr(skb); 1364 ihl = iph->ihl * 4; 1365 if (ihl < sizeof(*iph)) 1366 goto out; 1367 1368 id = ntohs(iph->id); 1369 proto = iph->protocol; 1370 1371 /* Warning: after this point, iph might be no longer valid */ 1372 if (unlikely(!pskb_may_pull(skb, ihl))) 1373 goto out; 1374 __skb_pull(skb, ihl); 1375 1376 encap = SKB_GSO_CB(skb)->encap_level > 0; 1377 if (encap) 1378 features &= skb->dev->hw_enc_features; 1379 SKB_GSO_CB(skb)->encap_level += ihl; 1380 1381 skb_reset_transport_header(skb); 1382 1383 segs = ERR_PTR(-EPROTONOSUPPORT); 1384 1385 if (!skb->encapsulation || encap) { 1386 udpfrag = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP); 1387 fixedid = !!(skb_shinfo(skb)->gso_type & SKB_GSO_TCP_FIXEDID); 1388 1389 /* fixed ID is invalid if DF bit is not set */ 1390 if (fixedid && !(ip_hdr(skb)->frag_off & htons(IP_DF))) 1391 goto out; 1392 } 1393 1394 ops = rcu_dereference(inet_offloads[proto]); 1395 if (likely(ops && ops->callbacks.gso_segment)) { 1396 segs = ops->callbacks.gso_segment(skb, features); 1397 if (!segs) 1398 skb->network_header = skb_mac_header(skb) + nhoff - skb->head; 1399 } 1400 1401 if (IS_ERR_OR_NULL(segs)) 1402 goto out; 1403 1404 gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL); 1405 1406 skb = segs; 1407 do { 1408 iph = (struct iphdr *)(skb_mac_header(skb) + nhoff); 1409 if (udpfrag) { 1410 iph->frag_off = htons(offset >> 3); 1411 if (skb->next) 1412 iph->frag_off |= htons(IP_MF); 1413 offset += skb->len - nhoff - ihl; 1414 tot_len = skb->len - nhoff; 1415 } else if (skb_is_gso(skb)) { 1416 if (!fixedid) { 1417 iph->id = htons(id); 1418 id += skb_shinfo(skb)->gso_segs; 1419 } 1420 1421 if (gso_partial) 1422 tot_len = skb_shinfo(skb)->gso_size + 1423 SKB_GSO_CB(skb)->data_offset + 1424 skb->head - (unsigned char *)iph; 1425 else 1426 tot_len = skb->len - nhoff; 1427 } else { 1428 if (!fixedid) 1429 iph->id = htons(id++); 1430 tot_len = skb->len - nhoff; 1431 } 1432 iph->tot_len = htons(tot_len); 1433 ip_send_check(iph); 1434 if (encap) 1435 skb_reset_inner_headers(skb); 1436 skb->network_header = (u8 *)iph - skb->head; 1437 skb_reset_mac_len(skb); 1438 } while ((skb = skb->next)); 1439 1440out: 1441 return segs; 1442} 1443EXPORT_SYMBOL(inet_gso_segment); 1444 1445static struct sk_buff *ipip_gso_segment(struct sk_buff *skb, 1446 netdev_features_t features) 1447{ 1448 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_IPXIP4)) 1449 return ERR_PTR(-EINVAL); 1450 1451 return inet_gso_segment(skb, features); 1452} 1453 1454struct sk_buff *inet_gro_receive(struct list_head *head, struct sk_buff *skb) 1455{ 1456 const struct net_offload *ops; 1457 struct sk_buff *pp = NULL; 1458 const struct iphdr *iph; 1459 struct sk_buff *p; 1460 unsigned int hlen; 1461 unsigned int off; 1462 unsigned int id; 1463 int flush = 1; 1464 int proto; 1465 1466 off = skb_gro_offset(skb); 1467 hlen = off + sizeof(*iph); 1468 iph = skb_gro_header_fast(skb, off); 1469 if (skb_gro_header_hard(skb, hlen)) { 1470 iph = skb_gro_header_slow(skb, hlen, off); 1471 if (unlikely(!iph)) 1472 goto out; 1473 } 1474 1475 proto = iph->protocol; 1476 1477 rcu_read_lock(); 1478 ops = rcu_dereference(inet_offloads[proto]); 1479 if (!ops || !ops->callbacks.gro_receive) 1480 goto out_unlock; 1481 1482 if (*(u8 *)iph != 0x45) 1483 goto out_unlock; 1484 1485 if (ip_is_fragment(iph)) 1486 goto out_unlock; 1487 1488 if (unlikely(ip_fast_csum((u8 *)iph, 5))) 1489 goto out_unlock; 1490 1491 id = ntohl(*(__be32 *)&iph->id); 1492 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF)); 1493 id >>= 16; 1494 1495 list_for_each_entry(p, head, list) { 1496 struct iphdr *iph2; 1497 u16 flush_id; 1498 1499 if (!NAPI_GRO_CB(p)->same_flow) 1500 continue; 1501 1502 iph2 = (struct iphdr *)(p->data + off); 1503 /* The above works because, with the exception of the top 1504 * (inner most) layer, we only aggregate pkts with the same 1505 * hdr length so all the hdrs we'll need to verify will start 1506 * at the same offset. 1507 */ 1508 if ((iph->protocol ^ iph2->protocol) | 1509 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) | 1510 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) { 1511 NAPI_GRO_CB(p)->same_flow = 0; 1512 continue; 1513 } 1514 1515 /* All fields must match except length and checksum. */ 1516 NAPI_GRO_CB(p)->flush |= 1517 (iph->ttl ^ iph2->ttl) | 1518 (iph->tos ^ iph2->tos) | 1519 ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF)); 1520 1521 NAPI_GRO_CB(p)->flush |= flush; 1522 1523 /* We need to store of the IP ID check to be included later 1524 * when we can verify that this packet does in fact belong 1525 * to a given flow. 1526 */ 1527 flush_id = (u16)(id - ntohs(iph2->id)); 1528 1529 /* This bit of code makes it much easier for us to identify 1530 * the cases where we are doing atomic vs non-atomic IP ID 1531 * checks. Specifically an atomic check can return IP ID 1532 * values 0 - 0xFFFF, while a non-atomic check can only 1533 * return 0 or 0xFFFF. 1534 */ 1535 if (!NAPI_GRO_CB(p)->is_atomic || 1536 !(iph->frag_off & htons(IP_DF))) { 1537 flush_id ^= NAPI_GRO_CB(p)->count; 1538 flush_id = flush_id ? 0xFFFF : 0; 1539 } 1540 1541 /* If the previous IP ID value was based on an atomic 1542 * datagram we can overwrite the value and ignore it. 1543 */ 1544 if (NAPI_GRO_CB(skb)->is_atomic) 1545 NAPI_GRO_CB(p)->flush_id = flush_id; 1546 else 1547 NAPI_GRO_CB(p)->flush_id |= flush_id; 1548 } 1549 1550 NAPI_GRO_CB(skb)->is_atomic = !!(iph->frag_off & htons(IP_DF)); 1551 NAPI_GRO_CB(skb)->flush |= flush; 1552 skb_set_network_header(skb, off); 1553 /* The above will be needed by the transport layer if there is one 1554 * immediately following this IP hdr. 1555 */ 1556 1557 /* Note : No need to call skb_gro_postpull_rcsum() here, 1558 * as we already checked checksum over ipv4 header was 0 1559 */ 1560 skb_gro_pull(skb, sizeof(*iph)); 1561 skb_set_transport_header(skb, skb_gro_offset(skb)); 1562 1563 pp = indirect_call_gro_receive(tcp4_gro_receive, udp4_gro_receive, 1564 ops->callbacks.gro_receive, head, skb); 1565 1566out_unlock: 1567 rcu_read_unlock(); 1568 1569out: 1570 skb_gro_flush_final(skb, pp, flush); 1571 1572 return pp; 1573} 1574EXPORT_SYMBOL(inet_gro_receive); 1575 1576static struct sk_buff *ipip_gro_receive(struct list_head *head, 1577 struct sk_buff *skb) 1578{ 1579 if (NAPI_GRO_CB(skb)->encap_mark) { 1580 NAPI_GRO_CB(skb)->flush = 1; 1581 return NULL; 1582 } 1583 1584 NAPI_GRO_CB(skb)->encap_mark = 1; 1585 1586 return inet_gro_receive(head, skb); 1587} 1588 1589#define SECONDS_PER_DAY 86400 1590 1591/* inet_current_timestamp - Return IP network timestamp 1592 * 1593 * Return milliseconds since midnight in network byte order. 1594 */ 1595__be32 inet_current_timestamp(void) 1596{ 1597 u32 secs; 1598 u32 msecs; 1599 struct timespec64 ts; 1600 1601 ktime_get_real_ts64(&ts); 1602 1603 /* Get secs since midnight. */ 1604 (void)div_u64_rem(ts.tv_sec, SECONDS_PER_DAY, &secs); 1605 /* Convert to msecs. */ 1606 msecs = secs * MSEC_PER_SEC; 1607 /* Convert nsec to msec. */ 1608 msecs += (u32)ts.tv_nsec / NSEC_PER_MSEC; 1609 1610 /* Convert to network byte order. */ 1611 return htonl(msecs); 1612} 1613EXPORT_SYMBOL(inet_current_timestamp); 1614 1615int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 1616{ 1617 unsigned int family = READ_ONCE(sk->sk_family); 1618 1619 if (family == AF_INET) 1620 return ip_recv_error(sk, msg, len, addr_len); 1621#if IS_ENABLED(CONFIG_IPV6) 1622 if (family == AF_INET6) 1623 return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len); 1624#endif 1625 return -EINVAL; 1626} 1627 1628int inet_gro_complete(struct sk_buff *skb, int nhoff) 1629{ 1630 __be16 newlen = htons(skb->len - nhoff); 1631 struct iphdr *iph = (struct iphdr *)(skb->data + nhoff); 1632 const struct net_offload *ops; 1633 int proto = iph->protocol; 1634 int err = -ENOSYS; 1635 1636 if (skb->encapsulation) { 1637 skb_set_inner_protocol(skb, cpu_to_be16(ETH_P_IP)); 1638 skb_set_inner_network_header(skb, nhoff); 1639 } 1640 1641 csum_replace2(&iph->check, iph->tot_len, newlen); 1642 iph->tot_len = newlen; 1643 1644 rcu_read_lock(); 1645 ops = rcu_dereference(inet_offloads[proto]); 1646 if (WARN_ON(!ops || !ops->callbacks.gro_complete)) 1647 goto out_unlock; 1648 1649 /* Only need to add sizeof(*iph) to get to the next hdr below 1650 * because any hdr with option will have been flushed in 1651 * inet_gro_receive(). 1652 */ 1653 err = INDIRECT_CALL_2(ops->callbacks.gro_complete, 1654 tcp4_gro_complete, udp4_gro_complete, 1655 skb, nhoff + sizeof(*iph)); 1656 1657out_unlock: 1658 rcu_read_unlock(); 1659 1660 return err; 1661} 1662EXPORT_SYMBOL(inet_gro_complete); 1663 1664static int ipip_gro_complete(struct sk_buff *skb, int nhoff) 1665{ 1666 skb->encapsulation = 1; 1667 skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4; 1668 return inet_gro_complete(skb, nhoff); 1669} 1670 1671int inet_ctl_sock_create(struct sock **sk, unsigned short family, 1672 unsigned short type, unsigned char protocol, 1673 struct net *net) 1674{ 1675 struct socket *sock; 1676 int rc = sock_create_kern(net, family, type, protocol, &sock); 1677 1678 if (rc == 0) { 1679 *sk = sock->sk; 1680 (*sk)->sk_allocation = GFP_ATOMIC; 1681 /* 1682 * Unhash it so that IP input processing does not even see it, 1683 * we do not wish this socket to see incoming packets. 1684 */ 1685 (*sk)->sk_prot->unhash(*sk); 1686 } 1687 return rc; 1688} 1689EXPORT_SYMBOL_GPL(inet_ctl_sock_create); 1690 1691u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offt) 1692{ 1693 return *(((unsigned long *)per_cpu_ptr(mib, cpu)) + offt); 1694} 1695EXPORT_SYMBOL_GPL(snmp_get_cpu_field); 1696 1697unsigned long snmp_fold_field(void __percpu *mib, int offt) 1698{ 1699 unsigned long res = 0; 1700 int i; 1701 1702 for_each_possible_cpu(i) 1703 res += snmp_get_cpu_field(mib, i, offt); 1704 return res; 1705} 1706EXPORT_SYMBOL_GPL(snmp_fold_field); 1707 1708#if BITS_PER_LONG==32 1709 1710u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offt, 1711 size_t syncp_offset) 1712{ 1713 void *bhptr; 1714 struct u64_stats_sync *syncp; 1715 u64 v; 1716 unsigned int start; 1717 1718 bhptr = per_cpu_ptr(mib, cpu); 1719 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset); 1720 do { 1721 start = u64_stats_fetch_begin_irq(syncp); 1722 v = *(((u64 *)bhptr) + offt); 1723 } while (u64_stats_fetch_retry_irq(syncp, start)); 1724 1725 return v; 1726} 1727EXPORT_SYMBOL_GPL(snmp_get_cpu_field64); 1728 1729u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset) 1730{ 1731 u64 res = 0; 1732 int cpu; 1733 1734 for_each_possible_cpu(cpu) { 1735 res += snmp_get_cpu_field64(mib, cpu, offt, syncp_offset); 1736 } 1737 return res; 1738} 1739EXPORT_SYMBOL_GPL(snmp_fold_field64); 1740#endif 1741 1742#ifdef CONFIG_IP_MULTICAST 1743static const struct net_protocol igmp_protocol = { 1744 .handler = igmp_rcv, 1745 .netns_ok = 1, 1746}; 1747#endif 1748 1749static const struct net_protocol tcp_protocol = { 1750 .handler = tcp_v4_rcv, 1751 .err_handler = tcp_v4_err, 1752 .no_policy = 1, 1753 .netns_ok = 1, 1754 .icmp_strict_tag_validation = 1, 1755}; 1756 1757static const struct net_protocol udp_protocol = { 1758 .handler = udp_rcv, 1759 .err_handler = udp_err, 1760 .no_policy = 1, 1761 .netns_ok = 1, 1762}; 1763 1764static const struct net_protocol icmp_protocol = { 1765 .handler = icmp_rcv, 1766 .err_handler = icmp_err, 1767 .no_policy = 1, 1768 .netns_ok = 1, 1769}; 1770 1771static __net_init int ipv4_mib_init_net(struct net *net) 1772{ 1773 int i; 1774 1775 net->mib.tcp_statistics = alloc_percpu(struct tcp_mib); 1776 if (!net->mib.tcp_statistics) 1777 goto err_tcp_mib; 1778 net->mib.ip_statistics = alloc_percpu(struct ipstats_mib); 1779 if (!net->mib.ip_statistics) 1780 goto err_ip_mib; 1781 1782 for_each_possible_cpu(i) { 1783 struct ipstats_mib *af_inet_stats; 1784 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i); 1785 u64_stats_init(&af_inet_stats->syncp); 1786 } 1787 1788 net->mib.net_statistics = alloc_percpu(struct linux_mib); 1789 if (!net->mib.net_statistics) 1790 goto err_net_mib; 1791 net->mib.udp_statistics = alloc_percpu(struct udp_mib); 1792 if (!net->mib.udp_statistics) 1793 goto err_udp_mib; 1794 net->mib.udplite_statistics = alloc_percpu(struct udp_mib); 1795 if (!net->mib.udplite_statistics) 1796 goto err_udplite_mib; 1797 net->mib.icmp_statistics = alloc_percpu(struct icmp_mib); 1798 if (!net->mib.icmp_statistics) 1799 goto err_icmp_mib; 1800 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib), 1801 GFP_KERNEL); 1802 if (!net->mib.icmpmsg_statistics) 1803 goto err_icmpmsg_mib; 1804 1805 tcp_mib_init(net); 1806 return 0; 1807 1808err_icmpmsg_mib: 1809 free_percpu(net->mib.icmp_statistics); 1810err_icmp_mib: 1811 free_percpu(net->mib.udplite_statistics); 1812err_udplite_mib: 1813 free_percpu(net->mib.udp_statistics); 1814err_udp_mib: 1815 free_percpu(net->mib.net_statistics); 1816err_net_mib: 1817 free_percpu(net->mib.ip_statistics); 1818err_ip_mib: 1819 free_percpu(net->mib.tcp_statistics); 1820err_tcp_mib: 1821 return -ENOMEM; 1822} 1823 1824static __net_exit void ipv4_mib_exit_net(struct net *net) 1825{ 1826 kfree(net->mib.icmpmsg_statistics); 1827 free_percpu(net->mib.icmp_statistics); 1828 free_percpu(net->mib.udplite_statistics); 1829 free_percpu(net->mib.udp_statistics); 1830 free_percpu(net->mib.net_statistics); 1831 free_percpu(net->mib.ip_statistics); 1832 free_percpu(net->mib.tcp_statistics); 1833#ifdef CONFIG_MPTCP 1834 /* allocated on demand, see mptcp_init_sock() */ 1835 free_percpu(net->mib.mptcp_statistics); 1836#endif 1837} 1838 1839static __net_initdata struct pernet_operations ipv4_mib_ops = { 1840 .init = ipv4_mib_init_net, 1841 .exit = ipv4_mib_exit_net, 1842}; 1843 1844static int __init init_ipv4_mibs(void) 1845{ 1846 return register_pernet_subsys(&ipv4_mib_ops); 1847} 1848 1849static __net_init int inet_init_net(struct net *net) 1850{ 1851 /* 1852 * Set defaults for local port range 1853 */ 1854 seqlock_init(&net->ipv4.ip_local_ports.lock); 1855 net->ipv4.ip_local_ports.range[0] = 32768; 1856 net->ipv4.ip_local_ports.range[1] = 60999; 1857 1858 seqlock_init(&net->ipv4.ping_group_range.lock); 1859 /* 1860 * Sane defaults - nobody may create ping sockets. 1861 * Boot scripts should set this to distro-specific group. 1862 */ 1863 net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1); 1864 net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0); 1865 1866 /* Default values for sysctl-controlled parameters. 1867 * We set them here, in case sysctl is not compiled. 1868 */ 1869 net->ipv4.sysctl_ip_default_ttl = IPDEFTTL; 1870 net->ipv4.sysctl_ip_fwd_update_priority = 1; 1871 net->ipv4.sysctl_ip_dynaddr = 0; 1872 net->ipv4.sysctl_ip_early_demux = 1; 1873 net->ipv4.sysctl_udp_early_demux = 1; 1874 net->ipv4.sysctl_tcp_early_demux = 1; 1875 net->ipv4.sysctl_nexthop_compat_mode = 1; 1876#ifdef CONFIG_SYSCTL 1877 net->ipv4.sysctl_ip_prot_sock = PROT_SOCK; 1878#endif 1879 1880 /* Some igmp sysctl, whose values are always used */ 1881 net->ipv4.sysctl_igmp_max_memberships = 20; 1882 net->ipv4.sysctl_igmp_max_msf = 10; 1883 /* IGMP reports for link-local multicast groups are enabled by default */ 1884 net->ipv4.sysctl_igmp_llm_reports = 1; 1885 net->ipv4.sysctl_igmp_qrv = 2; 1886 1887#ifdef CONFIG_LOWPOWER_PROTOCOL 1888 lowpower_protocol_net_init(net); 1889#endif /* CONFIG_LOWPOWER_PROTOCOL */ 1890 return 0; 1891} 1892 1893static __net_initdata struct pernet_operations af_inet_ops = { 1894 .init = inet_init_net, 1895}; 1896 1897static int __init init_inet_pernet_ops(void) 1898{ 1899 return register_pernet_subsys(&af_inet_ops); 1900} 1901 1902static int ipv4_proc_init(void); 1903 1904/* 1905 * IP protocol layer initialiser 1906 */ 1907 1908static struct packet_offload ip_packet_offload __read_mostly = { 1909 .type = cpu_to_be16(ETH_P_IP), 1910 .callbacks = { 1911 .gso_segment = inet_gso_segment, 1912 .gro_receive = inet_gro_receive, 1913 .gro_complete = inet_gro_complete, 1914 }, 1915}; 1916 1917static const struct net_offload ipip_offload = { 1918 .callbacks = { 1919 .gso_segment = ipip_gso_segment, 1920 .gro_receive = ipip_gro_receive, 1921 .gro_complete = ipip_gro_complete, 1922 }, 1923}; 1924 1925static int __init ipip_offload_init(void) 1926{ 1927 return inet_add_offload(&ipip_offload, IPPROTO_IPIP); 1928} 1929 1930static int __init ipv4_offload_init(void) 1931{ 1932 /* 1933 * Add offloads 1934 */ 1935 if (udpv4_offload_init() < 0) 1936 pr_crit("%s: Cannot add UDP protocol offload\n", __func__); 1937 if (tcpv4_offload_init() < 0) 1938 pr_crit("%s: Cannot add TCP protocol offload\n", __func__); 1939 if (ipip_offload_init() < 0) 1940 pr_crit("%s: Cannot add IPIP protocol offload\n", __func__); 1941 1942 dev_add_offload(&ip_packet_offload); 1943 return 0; 1944} 1945 1946fs_initcall(ipv4_offload_init); 1947 1948static struct packet_type ip_packet_type __read_mostly = { 1949 .type = cpu_to_be16(ETH_P_IP), 1950 .func = ip_rcv, 1951 .list_func = ip_list_rcv, 1952}; 1953 1954static int __init inet_init(void) 1955{ 1956 struct inet_protosw *q; 1957 struct list_head *r; 1958 int rc; 1959 1960 sock_skb_cb_check_size(sizeof(struct inet_skb_parm)); 1961 1962 rc = proto_register(&tcp_prot, 1); 1963 if (rc) 1964 goto out; 1965 1966 rc = proto_register(&udp_prot, 1); 1967 if (rc) 1968 goto out_unregister_tcp_proto; 1969 1970 rc = proto_register(&raw_prot, 1); 1971 if (rc) 1972 goto out_unregister_udp_proto; 1973 1974 rc = proto_register(&ping_prot, 1); 1975 if (rc) 1976 goto out_unregister_raw_proto; 1977 1978 /* 1979 * Tell SOCKET that we are alive... 1980 */ 1981 1982 (void)sock_register(&inet_family_ops); 1983 1984#ifdef CONFIG_SYSCTL 1985 ip_static_sysctl_init(); 1986#endif 1987 1988 /* 1989 * Add all the base protocols. 1990 */ 1991 1992 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 1993 pr_crit("%s: Cannot add ICMP protocol\n", __func__); 1994 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) 1995 pr_crit("%s: Cannot add UDP protocol\n", __func__); 1996 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) 1997 pr_crit("%s: Cannot add TCP protocol\n", __func__); 1998#ifdef CONFIG_IP_MULTICAST 1999 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 2000 pr_crit("%s: Cannot add IGMP protocol\n", __func__); 2001#endif 2002 2003 /* Register the socket-side information for inet_create. */ 2004 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 2005 INIT_LIST_HEAD(r); 2006 2007 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 2008 inet_register_protosw(q); 2009 2010 /* 2011 * Set the ARP module up 2012 */ 2013 2014 arp_init(); 2015 2016 /* 2017 * Set the IP module up 2018 */ 2019 2020 ip_init(); 2021 2022 /* Initialise per-cpu ipv4 mibs */ 2023 if (init_ipv4_mibs()) 2024 panic("%s: Cannot init ipv4 mibs\n", __func__); 2025 2026 /* Setup TCP slab cache for open requests. */ 2027 tcp_init(); 2028 2029 /* Setup UDP memory threshold */ 2030 udp_init(); 2031 2032 /* Add UDP-Lite (RFC 3828) */ 2033 udplite4_register(); 2034 2035 raw_init(); 2036 2037 ping_init(); 2038 2039 /* 2040 * Set the ICMP layer up 2041 */ 2042 2043 if (icmp_init() < 0) 2044 panic("Failed to create the ICMP control socket.\n"); 2045 2046 /* 2047 * Initialise the multicast router 2048 */ 2049#if defined(CONFIG_IP_MROUTE) 2050 if (ip_mr_init()) 2051 pr_crit("%s: Cannot init ipv4 mroute\n", __func__); 2052#endif 2053 2054 if (init_inet_pernet_ops()) 2055 pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__); 2056 2057 ipv4_proc_init(); 2058 2059 ipfrag_init(); 2060 2061 dev_add_pack(&ip_packet_type); 2062 2063 ip_tunnel_core_init(); 2064 2065 rc = 0; 2066out: 2067 return rc; 2068out_unregister_raw_proto: 2069 proto_unregister(&raw_prot); 2070out_unregister_udp_proto: 2071 proto_unregister(&udp_prot); 2072out_unregister_tcp_proto: 2073 proto_unregister(&tcp_prot); 2074 goto out; 2075} 2076 2077fs_initcall(inet_init); 2078 2079/* ------------------------------------------------------------------------ */ 2080 2081#ifdef CONFIG_PROC_FS 2082static int __init ipv4_proc_init(void) 2083{ 2084 int rc = 0; 2085 2086 if (raw_proc_init()) 2087 goto out_raw; 2088 if (tcp4_proc_init()) 2089 goto out_tcp; 2090 if (udp4_proc_init()) 2091 goto out_udp; 2092 if (ping_proc_init()) 2093 goto out_ping; 2094 if (ip_misc_proc_init()) 2095 goto out_misc; 2096out: 2097 return rc; 2098out_misc: 2099 ping_proc_exit(); 2100out_ping: 2101 udp4_proc_exit(); 2102out_udp: 2103 tcp4_proc_exit(); 2104out_tcp: 2105 raw_proc_exit(); 2106out_raw: 2107 rc = -ENOMEM; 2108 goto out; 2109} 2110 2111#else /* CONFIG_PROC_FS */ 2112static int __init ipv4_proc_init(void) 2113{ 2114 return 0; 2115} 2116#endif /* CONFIG_PROC_FS */ 2117