1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * INET An implementation of the TCP/IP protocol suite for the LINUX 4 * operating system. INET is implemented using the BSD Socket 5 * interface as the means of communication with the user level. 6 * 7 * PF_INET protocol family socket handler. 8 * 9 * Authors: Ross Biro 10 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 11 * Florian La Roche, <flla@stud.uni-sb.de> 12 * Alan Cox, <A.Cox@swansea.ac.uk> 13 * 14 * Changes (see also sock.c) 15 * 16 * piggy, 17 * Karl Knutson : Socket protocol table 18 * A.N.Kuznetsov : Socket death error in accept(). 19 * John Richardson : Fix non blocking error in connect() 20 * so sockets that fail to connect 21 * don't return -EINPROGRESS. 22 * Alan Cox : Asynchronous I/O support 23 * Alan Cox : Keep correct socket pointer on sock 24 * structures 25 * when accept() ed 26 * Alan Cox : Semantics of SO_LINGER aren't state 27 * moved to close when you look carefully. 28 * With this fixed and the accept bug fixed 29 * some RPC stuff seems happier. 30 * Niibe Yutaka : 4.4BSD style write async I/O 31 * Alan Cox, 32 * Tony Gale : Fixed reuse semantics. 33 * Alan Cox : bind() shouldn't abort existing but dead 34 * sockets. Stops FTP netin:.. I hope. 35 * Alan Cox : bind() works correctly for RAW sockets. 36 * Note that FreeBSD at least was broken 37 * in this respect so be careful with 38 * compatibility tests... 39 * Alan Cox : routing cache support 40 * Alan Cox : memzero the socket structure for 41 * compactness. 42 * Matt Day : nonblock connect error handler 43 * Alan Cox : Allow large numbers of pending sockets 44 * (eg for big web sites), but only if 45 * specifically application requested. 46 * Alan Cox : New buffering throughout IP. Used 47 * dumbly. 48 * Alan Cox : New buffering now used smartly. 49 * Alan Cox : BSD rather than common sense 50 * interpretation of listen. 51 * Germano Caronni : Assorted small races. 52 * Alan Cox : sendmsg/recvmsg basic support. 53 * Alan Cox : Only sendmsg/recvmsg now supported. 54 * Alan Cox : Locked down bind (see security list). 55 * Alan Cox : Loosened bind a little. 56 * Mike McLagan : ADD/DEL DLCI Ioctls 57 * Willy Konynenberg : Transparent proxying support. 58 * David S. Miller : New socket lookup architecture. 59 * Some other random speedups. 60 * Cyrus Durgin : Cleaned up file for kmod hacks. 61 * Andi Kleen : Fix inet_stream_connect TCP race. 62 */ 63 64 #define pr_fmt(fmt) "IPv4: " fmt 65 66 #include <linux/err.h> 67 #include <linux/errno.h> 68 #include <linux/types.h> 69 #include <linux/socket.h> 70 #include <linux/in.h> 71 #include <linux/kernel.h> 72 #include <linux/kmod.h> 73 #include <linux/sched.h> 74 #include <linux/timer.h> 75 #include <linux/string.h> 76 #include <linux/sockios.h> 77 #include <linux/net.h> 78 #include <linux/capability.h> 79 #include <linux/fcntl.h> 80 #include <linux/mm.h> 81 #include <linux/interrupt.h> 82 #include <linux/stat.h> 83 #include <linux/init.h> 84 #include <linux/poll.h> 85 #include <linux/netfilter_ipv4.h> 86 #include <linux/random.h> 87 #include <linux/slab.h> 88 89 #include <linux/uaccess.h> 90 91 #include <linux/inet.h> 92 #include <linux/igmp.h> 93 #include <linux/inetdevice.h> 94 #include <linux/netdevice.h> 95 #include <net/checksum.h> 96 #include <net/ip.h> 97 #include <net/protocol.h> 98 #include <net/arp.h> 99 #include <net/route.h> 100 #include <net/ip_fib.h> 101 #include <net/inet_connection_sock.h> 102 #include <net/tcp.h> 103 #include <net/udp.h> 104 #include <net/udplite.h> 105 #include <net/ping.h> 106 #include <linux/skbuff.h> 107 #include <net/sock.h> 108 #include <net/raw.h> 109 #include <net/icmp.h> 110 #include <net/inet_common.h> 111 #include <net/ip_tunnels.h> 112 #include <net/xfrm.h> 113 #include <net/net_namespace.h> 114 #include <net/secure_seq.h> 115 #ifdef CONFIG_IP_MROUTE 116 #include <linux/mroute.h> 117 #endif 118 #include <net/l3mdev.h> 119 #include <net/compat.h> 120 121 #include <trace/events/sock.h> 122 123 /* The inetsw table contains everything that inet_create needs to 124 * build a new socket. 125 */ 126 static struct list_head inetsw[SOCK_MAX]; 127 static DEFINE_SPINLOCK(inetsw_lock); 128 129 /* New destruction routine */ 130 131 void inet_sock_destruct(struct sock *sk) 132 { 133 struct inet_sock *inet = inet_sk(sk); 134 135 __skb_queue_purge(&sk->sk_receive_queue); 136 __skb_queue_purge(&sk->sk_error_queue); 137 138 sk_mem_reclaim_final(sk); 139 140 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) { 141 pr_err("Attempt to release TCP socket in state %d %p\n", 142 sk->sk_state, sk); 143 return; 144 } 145 if (!sock_flag(sk, SOCK_DEAD)) { 146 pr_err("Attempt to release alive inet socket %p\n", sk); 147 return; 148 } 149 150 WARN_ON(atomic_read(&sk->sk_rmem_alloc)); 151 WARN_ON(refcount_read(&sk->sk_wmem_alloc)); 152 WARN_ON(sk->sk_wmem_queued); 153 WARN_ON(sk_forward_alloc_get(sk)); 154 155 kfree(rcu_dereference_protected(inet->inet_opt, 1)); 156 dst_release(rcu_dereference_protected(sk->sk_dst_cache, 1)); 157 dst_release(sk->sk_rx_dst); 158 sk_refcnt_debug_dec(sk); 159 } 160 EXPORT_SYMBOL(inet_sock_destruct); 161 162 /* 163 * The routines beyond this point handle the behaviour of an AF_INET 164 * socket object. Mostly it punts to the subprotocols of IP to do 165 * the work. 166 */ 167 168 /* 169 * Automatically bind an unbound socket. 170 */ 171 172 static int inet_autobind(struct sock *sk) 173 { 174 struct inet_sock *inet; 175 /* We may need to bind the socket. */ 176 lock_sock(sk); 177 inet = inet_sk(sk); 178 if (!inet->inet_num) { 179 if (sk->sk_prot->get_port(sk, 0)) { 180 release_sock(sk); 181 return -EAGAIN; 182 } 183 inet->inet_sport = htons(inet->inet_num); 184 } 185 release_sock(sk); 186 return 0; 187 } 188 189 /* 190 * Move a socket into listening state. 191 */ 192 int inet_listen(struct socket *sock, int backlog) 193 { 194 struct sock *sk = sock->sk; 195 unsigned char old_state; 196 int err, tcp_fastopen; 197 198 lock_sock(sk); 199 200 err = -EINVAL; 201 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM) 202 goto out; 203 204 old_state = sk->sk_state; 205 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN))) 206 goto out; 207 208 WRITE_ONCE(sk->sk_max_ack_backlog, backlog); 209 /* Really, if the socket is already in listen state 210 * we can only allow the backlog to be adjusted. 211 */ 212 if (old_state != TCP_LISTEN) { 213 /* Enable TFO w/o requiring TCP_FASTOPEN socket option. 214 * Note that only TCP sockets (SOCK_STREAM) will reach here. 215 * Also fastopen backlog may already been set via the option 216 * because the socket was in TCP_LISTEN state previously but 217 * was shutdown() rather than close(). 218 */ 219 tcp_fastopen = sock_net(sk)->ipv4.sysctl_tcp_fastopen; 220 if ((tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) && 221 (tcp_fastopen & TFO_SERVER_ENABLE) && 222 !inet_csk(sk)->icsk_accept_queue.fastopenq.max_qlen) { 223 fastopen_queue_tune(sk, backlog); 224 tcp_fastopen_init_key_once(sock_net(sk)); 225 } 226 227 err = inet_csk_listen_start(sk, backlog); 228 if (err) 229 goto out; 230 tcp_call_bpf(sk, BPF_SOCK_OPS_TCP_LISTEN_CB, 0, NULL); 231 } 232 err = 0; 233 234 out: 235 release_sock(sk); 236 return err; 237 } 238 EXPORT_SYMBOL(inet_listen); 239 240 /* 241 * Create an inet socket. 242 */ 243 244 static int inet_create(struct net *net, struct socket *sock, int protocol, 245 int kern) 246 { 247 struct sock *sk; 248 struct inet_protosw *answer; 249 struct inet_sock *inet; 250 struct proto *answer_prot; 251 unsigned char answer_flags; 252 int try_loading_module = 0; 253 int err; 254 255 if (protocol < 0 || protocol >= IPPROTO_MAX) 256 return -EINVAL; 257 258 sock->state = SS_UNCONNECTED; 259 260 /* Look for the requested type/protocol pair. */ 261 lookup_protocol: 262 err = -ESOCKTNOSUPPORT; 263 rcu_read_lock(); 264 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) { 265 266 err = 0; 267 /* Check the non-wild match. */ 268 if (protocol == answer->protocol) { 269 if (protocol != IPPROTO_IP) 270 break; 271 } else { 272 /* Check for the two wild cases. */ 273 if (IPPROTO_IP == protocol) { 274 protocol = answer->protocol; 275 break; 276 } 277 if (IPPROTO_IP == answer->protocol) 278 break; 279 } 280 err = -EPROTONOSUPPORT; 281 } 282 283 if (unlikely(err)) { 284 if (try_loading_module < 2) { 285 rcu_read_unlock(); 286 /* 287 * Be more specific, e.g. net-pf-2-proto-132-type-1 288 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) 289 */ 290 if (++try_loading_module == 1) 291 request_module("net-pf-%d-proto-%d-type-%d", 292 PF_INET, protocol, sock->type); 293 /* 294 * Fall back to generic, e.g. net-pf-2-proto-132 295 * (net-pf-PF_INET-proto-IPPROTO_SCTP) 296 */ 297 else 298 request_module("net-pf-%d-proto-%d", 299 PF_INET, protocol); 300 goto lookup_protocol; 301 } else 302 goto out_rcu_unlock; 303 } 304 305 err = -EPERM; 306 if (sock->type == SOCK_RAW && !kern && 307 !ns_capable(net->user_ns, CAP_NET_RAW)) 308 goto out_rcu_unlock; 309 310 sock->ops = answer->ops; 311 answer_prot = answer->prot; 312 answer_flags = answer->flags; 313 rcu_read_unlock(); 314 315 WARN_ON(!answer_prot->slab); 316 317 err = -ENOMEM; 318 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot, kern); 319 if (!sk) 320 goto out; 321 322 err = 0; 323 if (INET_PROTOSW_REUSE & answer_flags) 324 sk->sk_reuse = SK_CAN_REUSE; 325 326 inet = inet_sk(sk); 327 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 328 329 inet->nodefrag = 0; 330 331 if (SOCK_RAW == sock->type) { 332 inet->inet_num = protocol; 333 if (IPPROTO_RAW == protocol) 334 inet->hdrincl = 1; 335 } 336 337 if (net->ipv4.sysctl_ip_no_pmtu_disc) 338 inet->pmtudisc = IP_PMTUDISC_DONT; 339 else 340 inet->pmtudisc = IP_PMTUDISC_WANT; 341 342 inet->inet_id = 0; 343 344 sock_init_data(sock, sk); 345 346 sk->sk_destruct = inet_sock_destruct; 347 sk->sk_protocol = protocol; 348 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 349 350 inet->uc_ttl = -1; 351 inet->mc_loop = 1; 352 inet->mc_ttl = 1; 353 inet->mc_all = 1; 354 inet->mc_index = 0; 355 inet->mc_list = NULL; 356 inet->rcv_tos = 0; 357 358 sk_refcnt_debug_inc(sk); 359 360 if (inet->inet_num) { 361 /* It assumes that any protocol which allows 362 * the user to assign a number at socket 363 * creation time automatically 364 * shares. 365 */ 366 inet->inet_sport = htons(inet->inet_num); 367 /* Add to protocol hash chains. */ 368 err = sk->sk_prot->hash(sk); 369 if (err) { 370 sk_common_release(sk); 371 goto out; 372 } 373 } 374 375 if (sk->sk_prot->init) { 376 err = sk->sk_prot->init(sk); 377 if (err) { 378 sk_common_release(sk); 379 goto out; 380 } 381 } 382 383 if (!kern) { 384 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk); 385 if (err) { 386 sk_common_release(sk); 387 goto out; 388 } 389 } 390 out: 391 return err; 392 out_rcu_unlock: 393 rcu_read_unlock(); 394 goto out; 395 } 396 397 398 /* 399 * The peer socket should always be NULL (or else). When we call this 400 * function we are destroying the object and from then on nobody 401 * should refer to it. 402 */ 403 int inet_release(struct socket *sock) 404 { 405 struct sock *sk = sock->sk; 406 407 if (sk) { 408 long timeout; 409 410 if (!sk->sk_kern_sock) 411 BPF_CGROUP_RUN_PROG_INET_SOCK_RELEASE(sk); 412 413 /* Applications forget to leave groups before exiting */ 414 ip_mc_drop_socket(sk); 415 416 /* If linger is set, we don't return until the close 417 * is complete. Otherwise we return immediately. The 418 * actually closing is done the same either way. 419 * 420 * If the close is due to the process exiting, we never 421 * linger.. 422 */ 423 timeout = 0; 424 if (sock_flag(sk, SOCK_LINGER) && 425 !(current->flags & PF_EXITING)) 426 timeout = sk->sk_lingertime; 427 sk->sk_prot->close(sk, timeout); 428 sock->sk = NULL; 429 } 430 return 0; 431 } 432 EXPORT_SYMBOL(inet_release); 433 434 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 435 { 436 struct sock *sk = sock->sk; 437 u32 flags = BIND_WITH_LOCK; 438 int err; 439 440 /* If the socket has its own bind function then use it. (RAW) */ 441 if (sk->sk_prot->bind) { 442 return sk->sk_prot->bind(sk, uaddr, addr_len); 443 } 444 if (addr_len < sizeof(struct sockaddr_in)) 445 return -EINVAL; 446 447 /* BPF prog is run before any checks are done so that if the prog 448 * changes context in a wrong way it will be caught. 449 */ 450 err = BPF_CGROUP_RUN_PROG_INET_BIND_LOCK(sk, uaddr, 451 CGROUP_INET4_BIND, &flags); 452 if (err) 453 return err; 454 455 return __inet_bind(sk, uaddr, addr_len, flags); 456 } 457 EXPORT_SYMBOL(inet_bind); 458 459 int __inet_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len, 460 u32 flags) 461 { 462 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 463 struct inet_sock *inet = inet_sk(sk); 464 struct net *net = sock_net(sk); 465 unsigned short snum; 466 int chk_addr_ret; 467 u32 tb_id = RT_TABLE_LOCAL; 468 int err; 469 470 if (addr->sin_family != AF_INET) { 471 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET) 472 * only if s_addr is INADDR_ANY. 473 */ 474 err = -EAFNOSUPPORT; 475 if (addr->sin_family != AF_UNSPEC || 476 addr->sin_addr.s_addr != htonl(INADDR_ANY)) 477 goto out; 478 } 479 480 tb_id = l3mdev_fib_table_by_index(net, sk->sk_bound_dev_if) ? : tb_id; 481 chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id); 482 483 /* Not specified by any standard per-se, however it breaks too 484 * many applications when removed. It is unfortunate since 485 * allowing applications to make a non-local bind solves 486 * several problems with systems using dynamic addressing. 487 * (ie. your servers still start up even if your ISDN link 488 * is temporarily down) 489 */ 490 err = -EADDRNOTAVAIL; 491 if (!inet_can_nonlocal_bind(net, inet) && 492 addr->sin_addr.s_addr != htonl(INADDR_ANY) && 493 chk_addr_ret != RTN_LOCAL && 494 chk_addr_ret != RTN_MULTICAST && 495 chk_addr_ret != RTN_BROADCAST) 496 goto out; 497 498 snum = ntohs(addr->sin_port); 499 err = -EACCES; 500 if (!(flags & BIND_NO_CAP_NET_BIND_SERVICE) && 501 snum && inet_port_requires_bind_service(net, snum) && 502 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 503 goto out; 504 505 /* We keep a pair of addresses. rcv_saddr is the one 506 * used by hash lookups, and saddr is used for transmit. 507 * 508 * In the BSD API these are the same except where it 509 * would be illegal to use them (multicast/broadcast) in 510 * which case the sending device address is used. 511 */ 512 if (flags & BIND_WITH_LOCK) 513 lock_sock(sk); 514 515 /* Check these errors (active socket, double bind). */ 516 err = -EINVAL; 517 if (sk->sk_state != TCP_CLOSE || inet->inet_num) 518 goto out_release_sock; 519 520 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 521 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 522 inet->inet_saddr = 0; /* Use device */ 523 524 /* Make sure we are allowed to bind here. */ 525 if (snum || !(inet->bind_address_no_port || 526 (flags & BIND_FORCE_ADDRESS_NO_PORT))) { 527 if (sk->sk_prot->get_port(sk, snum)) { 528 inet->inet_saddr = inet->inet_rcv_saddr = 0; 529 err = -EADDRINUSE; 530 goto out_release_sock; 531 } 532 if (!(flags & BIND_FROM_BPF)) { 533 err = BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk); 534 if (err) { 535 inet->inet_saddr = inet->inet_rcv_saddr = 0; 536 goto out_release_sock; 537 } 538 } 539 } 540 541 if (inet->inet_rcv_saddr) 542 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 543 if (snum) 544 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 545 inet->inet_sport = htons(inet->inet_num); 546 inet->inet_daddr = 0; 547 inet->inet_dport = 0; 548 sk_dst_reset(sk); 549 err = 0; 550 out_release_sock: 551 if (flags & BIND_WITH_LOCK) 552 release_sock(sk); 553 out: 554 return err; 555 } 556 557 int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr, 558 int addr_len, int flags) 559 { 560 struct sock *sk = sock->sk; 561 int err; 562 563 if (addr_len < sizeof(uaddr->sa_family)) 564 return -EINVAL; 565 if (uaddr->sa_family == AF_UNSPEC) 566 return sk->sk_prot->disconnect(sk, flags); 567 568 if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) { 569 err = sk->sk_prot->pre_connect(sk, uaddr, addr_len); 570 if (err) 571 return err; 572 } 573 574 if (data_race(!inet_sk(sk)->inet_num) && inet_autobind(sk)) 575 return -EAGAIN; 576 return sk->sk_prot->connect(sk, uaddr, addr_len); 577 } 578 EXPORT_SYMBOL(inet_dgram_connect); 579 580 static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias) 581 { 582 DEFINE_WAIT_FUNC(wait, woken_wake_function); 583 584 add_wait_queue(sk_sleep(sk), &wait); 585 sk->sk_write_pending += writebias; 586 587 /* Basic assumption: if someone sets sk->sk_err, he _must_ 588 * change state of the socket from TCP_SYN_*. 589 * Connect() does not allow to get error notifications 590 * without closing the socket. 591 */ 592 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 593 release_sock(sk); 594 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo); 595 lock_sock(sk); 596 if (signal_pending(current) || !timeo) 597 break; 598 } 599 remove_wait_queue(sk_sleep(sk), &wait); 600 sk->sk_write_pending -= writebias; 601 return timeo; 602 } 603 604 /* 605 * Connect to a remote host. There is regrettably still a little 606 * TCP 'magic' in here. 607 */ 608 int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 609 int addr_len, int flags, int is_sendmsg) 610 { 611 struct sock *sk = sock->sk; 612 int err; 613 long timeo; 614 615 /* 616 * uaddr can be NULL and addr_len can be 0 if: 617 * sk is a TCP fastopen active socket and 618 * TCP_FASTOPEN_CONNECT sockopt is set and 619 * we already have a valid cookie for this socket. 620 * In this case, user can call write() after connect(). 621 * write() will invoke tcp_sendmsg_fastopen() which calls 622 * __inet_stream_connect(). 623 */ 624 if (uaddr) { 625 if (addr_len < sizeof(uaddr->sa_family)) 626 return -EINVAL; 627 628 if (uaddr->sa_family == AF_UNSPEC) { 629 err = sk->sk_prot->disconnect(sk, flags); 630 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 631 goto out; 632 } 633 } 634 635 switch (sock->state) { 636 default: 637 err = -EINVAL; 638 goto out; 639 case SS_CONNECTED: 640 err = -EISCONN; 641 goto out; 642 case SS_CONNECTING: 643 if (inet_sk(sk)->defer_connect) 644 err = is_sendmsg ? -EINPROGRESS : -EISCONN; 645 else 646 err = -EALREADY; 647 /* Fall out of switch with err, set for this state */ 648 break; 649 case SS_UNCONNECTED: 650 err = -EISCONN; 651 if (sk->sk_state != TCP_CLOSE) 652 goto out; 653 654 if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) { 655 err = sk->sk_prot->pre_connect(sk, uaddr, addr_len); 656 if (err) 657 goto out; 658 } 659 660 err = sk->sk_prot->connect(sk, uaddr, addr_len); 661 if (err < 0) 662 goto out; 663 664 sock->state = SS_CONNECTING; 665 666 if (!err && inet_sk(sk)->defer_connect) 667 goto out; 668 669 /* Just entered SS_CONNECTING state; the only 670 * difference is that return value in non-blocking 671 * case is EINPROGRESS, rather than EALREADY. 672 */ 673 err = -EINPROGRESS; 674 break; 675 } 676 677 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 678 679 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 680 int writebias = (sk->sk_protocol == IPPROTO_TCP) && 681 tcp_sk(sk)->fastopen_req && 682 tcp_sk(sk)->fastopen_req->data ? 1 : 0; 683 684 /* Error code is set above */ 685 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias)) 686 goto out; 687 688 err = sock_intr_errno(timeo); 689 if (signal_pending(current)) 690 goto out; 691 } 692 693 /* Connection was closed by RST, timeout, ICMP error 694 * or another process disconnected us. 695 */ 696 if (sk->sk_state == TCP_CLOSE) 697 goto sock_error; 698 699 /* sk->sk_err may be not zero now, if RECVERR was ordered by user 700 * and error was received after socket entered established state. 701 * Hence, it is handled normally after connect() return successfully. 702 */ 703 704 sock->state = SS_CONNECTED; 705 err = 0; 706 out: 707 return err; 708 709 sock_error: 710 err = sock_error(sk) ? : -ECONNABORTED; 711 sock->state = SS_UNCONNECTED; 712 if (sk->sk_prot->disconnect(sk, flags)) 713 sock->state = SS_DISCONNECTING; 714 goto out; 715 } 716 EXPORT_SYMBOL(__inet_stream_connect); 717 718 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 719 int addr_len, int flags) 720 { 721 int err; 722 723 lock_sock(sock->sk); 724 err = __inet_stream_connect(sock, uaddr, addr_len, flags, 0); 725 release_sock(sock->sk); 726 return err; 727 } 728 EXPORT_SYMBOL(inet_stream_connect); 729 730 /* 731 * Accept a pending connection. The TCP layer now gives BSD semantics. 732 */ 733 734 int inet_accept(struct socket *sock, struct socket *newsock, int flags, 735 bool kern) 736 { 737 struct sock *sk1 = sock->sk; 738 int err = -EINVAL; 739 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err, kern); 740 741 if (!sk2) 742 goto do_err; 743 744 lock_sock(sk2); 745 746 sock_rps_record_flow(sk2); 747 WARN_ON(!((1 << sk2->sk_state) & 748 (TCPF_ESTABLISHED | TCPF_SYN_RECV | 749 TCPF_CLOSE_WAIT | TCPF_CLOSE))); 750 751 sock_graft(sk2, newsock); 752 753 newsock->state = SS_CONNECTED; 754 err = 0; 755 release_sock(sk2); 756 do_err: 757 return err; 758 } 759 EXPORT_SYMBOL(inet_accept); 760 761 /* 762 * This does both peername and sockname. 763 */ 764 int inet_getname(struct socket *sock, struct sockaddr *uaddr, 765 int peer) 766 { 767 struct sock *sk = sock->sk; 768 struct inet_sock *inet = inet_sk(sk); 769 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr); 770 771 sin->sin_family = AF_INET; 772 lock_sock(sk); 773 if (peer) { 774 if (!inet->inet_dport || 775 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 776 peer == 1)) { 777 release_sock(sk); 778 return -ENOTCONN; 779 } 780 sin->sin_port = inet->inet_dport; 781 sin->sin_addr.s_addr = inet->inet_daddr; 782 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin, 783 CGROUP_INET4_GETPEERNAME); 784 } else { 785 __be32 addr = inet->inet_rcv_saddr; 786 if (!addr) 787 addr = inet->inet_saddr; 788 sin->sin_port = inet->inet_sport; 789 sin->sin_addr.s_addr = addr; 790 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin, 791 CGROUP_INET4_GETSOCKNAME); 792 } 793 release_sock(sk); 794 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 795 return sizeof(*sin); 796 } 797 EXPORT_SYMBOL(inet_getname); 798 799 int inet_send_prepare(struct sock *sk) 800 { 801 sock_rps_record_flow(sk); 802 803 /* We may need to bind the socket. */ 804 if (data_race(!inet_sk(sk)->inet_num) && !sk->sk_prot->no_autobind && 805 inet_autobind(sk)) 806 return -EAGAIN; 807 808 return 0; 809 } 810 EXPORT_SYMBOL_GPL(inet_send_prepare); 811 812 int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) 813 { 814 struct sock *sk = sock->sk; 815 816 if (unlikely(inet_send_prepare(sk))) 817 return -EAGAIN; 818 819 return INDIRECT_CALL_2(sk->sk_prot->sendmsg, tcp_sendmsg, udp_sendmsg, 820 sk, msg, size); 821 } 822 EXPORT_SYMBOL(inet_sendmsg); 823 824 ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, 825 size_t size, int flags) 826 { 827 struct sock *sk = sock->sk; 828 829 if (unlikely(inet_send_prepare(sk))) 830 return -EAGAIN; 831 832 if (sk->sk_prot->sendpage) 833 return sk->sk_prot->sendpage(sk, page, offset, size, flags); 834 return sock_no_sendpage(sock, page, offset, size, flags); 835 } 836 EXPORT_SYMBOL(inet_sendpage); 837 838 INDIRECT_CALLABLE_DECLARE(int udp_recvmsg(struct sock *, struct msghdr *, 839 size_t, int, int, int *)); 840 int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 841 int flags) 842 { 843 struct sock *sk = sock->sk; 844 int addr_len = 0; 845 int err; 846 847 if (likely(!(flags & MSG_ERRQUEUE))) 848 sock_rps_record_flow(sk); 849 850 err = INDIRECT_CALL_2(sk->sk_prot->recvmsg, tcp_recvmsg, udp_recvmsg, 851 sk, msg, size, flags & MSG_DONTWAIT, 852 flags & ~MSG_DONTWAIT, &addr_len); 853 if (err >= 0) 854 msg->msg_namelen = addr_len; 855 return err; 856 } 857 EXPORT_SYMBOL(inet_recvmsg); 858 859 int inet_shutdown(struct socket *sock, int how) 860 { 861 struct sock *sk = sock->sk; 862 int err = 0; 863 864 /* This should really check to make sure 865 * the socket is a TCP socket. (WHY AC...) 866 */ 867 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and 868 1->2 bit 2 snds. 869 2->3 */ 870 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ 871 return -EINVAL; 872 873 lock_sock(sk); 874 if (sock->state == SS_CONNECTING) { 875 if ((1 << sk->sk_state) & 876 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) 877 sock->state = SS_DISCONNECTING; 878 else 879 sock->state = SS_CONNECTED; 880 } 881 882 switch (sk->sk_state) { 883 case TCP_CLOSE: 884 err = -ENOTCONN; 885 /* Hack to wake up other listeners, who can poll for 886 EPOLLHUP, even on eg. unconnected UDP sockets -- RR */ 887 fallthrough; 888 default: 889 sk->sk_shutdown |= how; 890 if (sk->sk_prot->shutdown) 891 sk->sk_prot->shutdown(sk, how); 892 break; 893 894 /* Remaining two branches are temporary solution for missing 895 * close() in multithreaded environment. It is _not_ a good idea, 896 * but we have no choice until close() is repaired at VFS level. 897 */ 898 case TCP_LISTEN: 899 if (!(how & RCV_SHUTDOWN)) 900 break; 901 fallthrough; 902 case TCP_SYN_SENT: 903 err = sk->sk_prot->disconnect(sk, O_NONBLOCK); 904 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 905 break; 906 } 907 908 /* Wake up anyone sleeping in poll. */ 909 sk->sk_state_change(sk); 910 release_sock(sk); 911 return err; 912 } 913 EXPORT_SYMBOL(inet_shutdown); 914 915 /* 916 * ioctl() calls you can issue on an INET socket. Most of these are 917 * device configuration and stuff and very rarely used. Some ioctls 918 * pass on to the socket itself. 919 * 920 * NOTE: I like the idea of a module for the config stuff. ie ifconfig 921 * loads the devconfigure module does its configuring and unloads it. 922 * There's a good 20K of config code hanging around the kernel. 923 */ 924 925 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 926 { 927 struct sock *sk = sock->sk; 928 int err = 0; 929 struct net *net = sock_net(sk); 930 void __user *p = (void __user *)arg; 931 struct ifreq ifr; 932 struct rtentry rt; 933 934 switch (cmd) { 935 case SIOCADDRT: 936 case SIOCDELRT: 937 if (copy_from_user(&rt, p, sizeof(struct rtentry))) 938 return -EFAULT; 939 err = ip_rt_ioctl(net, cmd, &rt); 940 break; 941 case SIOCRTMSG: 942 err = -EINVAL; 943 break; 944 case SIOCDARP: 945 case SIOCGARP: 946 case SIOCSARP: 947 err = arp_ioctl(net, cmd, (void __user *)arg); 948 break; 949 case SIOCGIFADDR: 950 case SIOCGIFBRDADDR: 951 case SIOCGIFNETMASK: 952 case SIOCGIFDSTADDR: 953 case SIOCGIFPFLAGS: 954 if (get_user_ifreq(&ifr, NULL, p)) 955 return -EFAULT; 956 err = devinet_ioctl(net, cmd, &ifr); 957 if (!err && put_user_ifreq(&ifr, p)) 958 err = -EFAULT; 959 break; 960 961 case SIOCSIFADDR: 962 case SIOCSIFBRDADDR: 963 case SIOCSIFNETMASK: 964 case SIOCSIFDSTADDR: 965 case SIOCSIFPFLAGS: 966 case SIOCSIFFLAGS: 967 if (get_user_ifreq(&ifr, NULL, p)) 968 return -EFAULT; 969 err = devinet_ioctl(net, cmd, &ifr); 970 break; 971 default: 972 if (sk->sk_prot->ioctl) 973 err = sk->sk_prot->ioctl(sk, cmd, arg); 974 else 975 err = -ENOIOCTLCMD; 976 break; 977 } 978 return err; 979 } 980 EXPORT_SYMBOL(inet_ioctl); 981 982 #ifdef CONFIG_COMPAT 983 static int inet_compat_routing_ioctl(struct sock *sk, unsigned int cmd, 984 struct compat_rtentry __user *ur) 985 { 986 compat_uptr_t rtdev; 987 struct rtentry rt; 988 989 if (copy_from_user(&rt.rt_dst, &ur->rt_dst, 990 3 * sizeof(struct sockaddr)) || 991 get_user(rt.rt_flags, &ur->rt_flags) || 992 get_user(rt.rt_metric, &ur->rt_metric) || 993 get_user(rt.rt_mtu, &ur->rt_mtu) || 994 get_user(rt.rt_window, &ur->rt_window) || 995 get_user(rt.rt_irtt, &ur->rt_irtt) || 996 get_user(rtdev, &ur->rt_dev)) 997 return -EFAULT; 998 999 rt.rt_dev = compat_ptr(rtdev); 1000 return ip_rt_ioctl(sock_net(sk), cmd, &rt); 1001 } 1002 1003 static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1004 { 1005 void __user *argp = compat_ptr(arg); 1006 struct sock *sk = sock->sk; 1007 1008 switch (cmd) { 1009 case SIOCADDRT: 1010 case SIOCDELRT: 1011 return inet_compat_routing_ioctl(sk, cmd, argp); 1012 default: 1013 if (!sk->sk_prot->compat_ioctl) 1014 return -ENOIOCTLCMD; 1015 return sk->sk_prot->compat_ioctl(sk, cmd, arg); 1016 } 1017 } 1018 #endif /* CONFIG_COMPAT */ 1019 1020 const struct proto_ops inet_stream_ops = { 1021 .family = PF_INET, 1022 .owner = THIS_MODULE, 1023 .release = inet_release, 1024 .bind = inet_bind, 1025 .connect = inet_stream_connect, 1026 .socketpair = sock_no_socketpair, 1027 .accept = inet_accept, 1028 .getname = inet_getname, 1029 .poll = tcp_poll, 1030 .ioctl = inet_ioctl, 1031 .gettstamp = sock_gettstamp, 1032 .listen = inet_listen, 1033 .shutdown = inet_shutdown, 1034 .setsockopt = sock_common_setsockopt, 1035 .getsockopt = sock_common_getsockopt, 1036 .sendmsg = inet_sendmsg, 1037 .recvmsg = inet_recvmsg, 1038 #ifdef CONFIG_MMU 1039 .mmap = tcp_mmap, 1040 #endif 1041 .sendpage = inet_sendpage, 1042 .splice_read = tcp_splice_read, 1043 .read_sock = tcp_read_sock, 1044 .sendmsg_locked = tcp_sendmsg_locked, 1045 .sendpage_locked = tcp_sendpage_locked, 1046 .peek_len = tcp_peek_len, 1047 #ifdef CONFIG_COMPAT 1048 .compat_ioctl = inet_compat_ioctl, 1049 #endif 1050 .set_rcvlowat = tcp_set_rcvlowat, 1051 }; 1052 EXPORT_SYMBOL(inet_stream_ops); 1053 1054 const struct proto_ops inet_dgram_ops = { 1055 .family = PF_INET, 1056 .owner = THIS_MODULE, 1057 .release = inet_release, 1058 .bind = inet_bind, 1059 .connect = inet_dgram_connect, 1060 .socketpair = sock_no_socketpair, 1061 .accept = sock_no_accept, 1062 .getname = inet_getname, 1063 .poll = udp_poll, 1064 .ioctl = inet_ioctl, 1065 .gettstamp = sock_gettstamp, 1066 .listen = sock_no_listen, 1067 .shutdown = inet_shutdown, 1068 .setsockopt = sock_common_setsockopt, 1069 .getsockopt = sock_common_getsockopt, 1070 .sendmsg = inet_sendmsg, 1071 .read_sock = udp_read_sock, 1072 .recvmsg = inet_recvmsg, 1073 .mmap = sock_no_mmap, 1074 .sendpage = inet_sendpage, 1075 .set_peek_off = sk_set_peek_off, 1076 #ifdef CONFIG_COMPAT 1077 .compat_ioctl = inet_compat_ioctl, 1078 #endif 1079 }; 1080 EXPORT_SYMBOL(inet_dgram_ops); 1081 1082 /* 1083 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 1084 * udp_poll 1085 */ 1086 static const struct proto_ops inet_sockraw_ops = { 1087 .family = PF_INET, 1088 .owner = THIS_MODULE, 1089 .release = inet_release, 1090 .bind = inet_bind, 1091 .connect = inet_dgram_connect, 1092 .socketpair = sock_no_socketpair, 1093 .accept = sock_no_accept, 1094 .getname = inet_getname, 1095 .poll = datagram_poll, 1096 .ioctl = inet_ioctl, 1097 .gettstamp = sock_gettstamp, 1098 .listen = sock_no_listen, 1099 .shutdown = inet_shutdown, 1100 .setsockopt = sock_common_setsockopt, 1101 .getsockopt = sock_common_getsockopt, 1102 .sendmsg = inet_sendmsg, 1103 .recvmsg = inet_recvmsg, 1104 .mmap = sock_no_mmap, 1105 .sendpage = inet_sendpage, 1106 #ifdef CONFIG_COMPAT 1107 .compat_ioctl = inet_compat_ioctl, 1108 #endif 1109 }; 1110 1111 static const struct net_proto_family inet_family_ops = { 1112 .family = PF_INET, 1113 .create = inet_create, 1114 .owner = THIS_MODULE, 1115 }; 1116 1117 /* Upon startup we insert all the elements in inetsw_array[] into 1118 * the linked list inetsw. 1119 */ 1120 static struct inet_protosw inetsw_array[] = 1121 { 1122 { 1123 .type = SOCK_STREAM, 1124 .protocol = IPPROTO_TCP, 1125 .prot = &tcp_prot, 1126 .ops = &inet_stream_ops, 1127 .flags = INET_PROTOSW_PERMANENT | 1128 INET_PROTOSW_ICSK, 1129 }, 1130 1131 { 1132 .type = SOCK_DGRAM, 1133 .protocol = IPPROTO_UDP, 1134 .prot = &udp_prot, 1135 .ops = &inet_dgram_ops, 1136 .flags = INET_PROTOSW_PERMANENT, 1137 }, 1138 1139 { 1140 .type = SOCK_DGRAM, 1141 .protocol = IPPROTO_ICMP, 1142 .prot = &ping_prot, 1143 .ops = &inet_sockraw_ops, 1144 .flags = INET_PROTOSW_REUSE, 1145 }, 1146 1147 { 1148 .type = SOCK_RAW, 1149 .protocol = IPPROTO_IP, /* wild card */ 1150 .prot = &raw_prot, 1151 .ops = &inet_sockraw_ops, 1152 .flags = INET_PROTOSW_REUSE, 1153 } 1154 }; 1155 1156 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) 1157 1158 void inet_register_protosw(struct inet_protosw *p) 1159 { 1160 struct list_head *lh; 1161 struct inet_protosw *answer; 1162 int protocol = p->protocol; 1163 struct list_head *last_perm; 1164 1165 spin_lock_bh(&inetsw_lock); 1166 1167 if (p->type >= SOCK_MAX) 1168 goto out_illegal; 1169 1170 /* If we are trying to override a permanent protocol, bail. */ 1171 last_perm = &inetsw[p->type]; 1172 list_for_each(lh, &inetsw[p->type]) { 1173 answer = list_entry(lh, struct inet_protosw, list); 1174 /* Check only the non-wild match. */ 1175 if ((INET_PROTOSW_PERMANENT & answer->flags) == 0) 1176 break; 1177 if (protocol == answer->protocol) 1178 goto out_permanent; 1179 last_perm = lh; 1180 } 1181 1182 /* Add the new entry after the last permanent entry if any, so that 1183 * the new entry does not override a permanent entry when matched with 1184 * a wild-card protocol. But it is allowed to override any existing 1185 * non-permanent entry. This means that when we remove this entry, the 1186 * system automatically returns to the old behavior. 1187 */ 1188 list_add_rcu(&p->list, last_perm); 1189 out: 1190 spin_unlock_bh(&inetsw_lock); 1191 1192 return; 1193 1194 out_permanent: 1195 pr_err("Attempt to override permanent protocol %d\n", protocol); 1196 goto out; 1197 1198 out_illegal: 1199 pr_err("Ignoring attempt to register invalid socket type %d\n", 1200 p->type); 1201 goto out; 1202 } 1203 EXPORT_SYMBOL(inet_register_protosw); 1204 1205 void inet_unregister_protosw(struct inet_protosw *p) 1206 { 1207 if (INET_PROTOSW_PERMANENT & p->flags) { 1208 pr_err("Attempt to unregister permanent protocol %d\n", 1209 p->protocol); 1210 } else { 1211 spin_lock_bh(&inetsw_lock); 1212 list_del_rcu(&p->list); 1213 spin_unlock_bh(&inetsw_lock); 1214 1215 synchronize_net(); 1216 } 1217 } 1218 EXPORT_SYMBOL(inet_unregister_protosw); 1219 1220 static int inet_sk_reselect_saddr(struct sock *sk) 1221 { 1222 struct inet_sock *inet = inet_sk(sk); 1223 __be32 old_saddr = inet->inet_saddr; 1224 __be32 daddr = inet->inet_daddr; 1225 struct flowi4 *fl4; 1226 struct rtable *rt; 1227 __be32 new_saddr; 1228 struct ip_options_rcu *inet_opt; 1229 1230 inet_opt = rcu_dereference_protected(inet->inet_opt, 1231 lockdep_sock_is_held(sk)); 1232 if (inet_opt && inet_opt->opt.srr) 1233 daddr = inet_opt->opt.faddr; 1234 1235 /* Query new route. */ 1236 fl4 = &inet->cork.fl.u.ip4; 1237 rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk), 1238 sk->sk_bound_dev_if, sk->sk_protocol, 1239 inet->inet_sport, inet->inet_dport, sk); 1240 if (IS_ERR(rt)) 1241 return PTR_ERR(rt); 1242 1243 sk_setup_caps(sk, &rt->dst); 1244 1245 new_saddr = fl4->saddr; 1246 1247 if (new_saddr == old_saddr) 1248 return 0; 1249 1250 if (sock_net(sk)->ipv4.sysctl_ip_dynaddr > 1) { 1251 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n", 1252 __func__, &old_saddr, &new_saddr); 1253 } 1254 1255 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr; 1256 1257 /* 1258 * XXX The only one ugly spot where we need to 1259 * XXX really change the sockets identity after 1260 * XXX it has entered the hashes. -DaveM 1261 * 1262 * Besides that, it does not check for connection 1263 * uniqueness. Wait for troubles. 1264 */ 1265 return __sk_prot_rehash(sk); 1266 } 1267 1268 int inet_sk_rebuild_header(struct sock *sk) 1269 { 1270 struct inet_sock *inet = inet_sk(sk); 1271 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); 1272 __be32 daddr; 1273 struct ip_options_rcu *inet_opt; 1274 struct flowi4 *fl4; 1275 int err; 1276 1277 /* Route is OK, nothing to do. */ 1278 if (rt) 1279 return 0; 1280 1281 /* Reroute. */ 1282 rcu_read_lock(); 1283 inet_opt = rcu_dereference(inet->inet_opt); 1284 daddr = inet->inet_daddr; 1285 if (inet_opt && inet_opt->opt.srr) 1286 daddr = inet_opt->opt.faddr; 1287 rcu_read_unlock(); 1288 fl4 = &inet->cork.fl.u.ip4; 1289 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr, 1290 inet->inet_dport, inet->inet_sport, 1291 sk->sk_protocol, RT_CONN_FLAGS(sk), 1292 sk->sk_bound_dev_if); 1293 if (!IS_ERR(rt)) { 1294 err = 0; 1295 sk_setup_caps(sk, &rt->dst); 1296 } else { 1297 err = PTR_ERR(rt); 1298 1299 /* Routing failed... */ 1300 sk->sk_route_caps = 0; 1301 /* 1302 * Other protocols have to map its equivalent state to TCP_SYN_SENT. 1303 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme 1304 */ 1305 if (!sock_net(sk)->ipv4.sysctl_ip_dynaddr || 1306 sk->sk_state != TCP_SYN_SENT || 1307 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 1308 (err = inet_sk_reselect_saddr(sk)) != 0) 1309 sk->sk_err_soft = -err; 1310 } 1311 1312 return err; 1313 } 1314 EXPORT_SYMBOL(inet_sk_rebuild_header); 1315 1316 void inet_sk_set_state(struct sock *sk, int state) 1317 { 1318 trace_inet_sock_set_state(sk, sk->sk_state, state); 1319 sk->sk_state = state; 1320 } 1321 EXPORT_SYMBOL(inet_sk_set_state); 1322 1323 void inet_sk_state_store(struct sock *sk, int newstate) 1324 { 1325 trace_inet_sock_set_state(sk, sk->sk_state, newstate); 1326 smp_store_release(&sk->sk_state, newstate); 1327 } 1328 1329 struct sk_buff *inet_gso_segment(struct sk_buff *skb, 1330 netdev_features_t features) 1331 { 1332 bool udpfrag = false, fixedid = false, gso_partial, encap; 1333 struct sk_buff *segs = ERR_PTR(-EINVAL); 1334 const struct net_offload *ops; 1335 unsigned int offset = 0; 1336 struct iphdr *iph; 1337 int proto, tot_len; 1338 int nhoff; 1339 int ihl; 1340 int id; 1341 1342 skb_reset_network_header(skb); 1343 nhoff = skb_network_header(skb) - skb_mac_header(skb); 1344 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1345 goto out; 1346 1347 iph = ip_hdr(skb); 1348 ihl = iph->ihl * 4; 1349 if (ihl < sizeof(*iph)) 1350 goto out; 1351 1352 id = ntohs(iph->id); 1353 proto = iph->protocol; 1354 1355 /* Warning: after this point, iph might be no longer valid */ 1356 if (unlikely(!pskb_may_pull(skb, ihl))) 1357 goto out; 1358 __skb_pull(skb, ihl); 1359 1360 encap = SKB_GSO_CB(skb)->encap_level > 0; 1361 if (encap) 1362 features &= skb->dev->hw_enc_features; 1363 SKB_GSO_CB(skb)->encap_level += ihl; 1364 1365 skb_reset_transport_header(skb); 1366 1367 segs = ERR_PTR(-EPROTONOSUPPORT); 1368 1369 if (!skb->encapsulation || encap) { 1370 udpfrag = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP); 1371 fixedid = !!(skb_shinfo(skb)->gso_type & SKB_GSO_TCP_FIXEDID); 1372 1373 /* fixed ID is invalid if DF bit is not set */ 1374 if (fixedid && !(ip_hdr(skb)->frag_off & htons(IP_DF))) 1375 goto out; 1376 } 1377 1378 ops = rcu_dereference(inet_offloads[proto]); 1379 if (likely(ops && ops->callbacks.gso_segment)) 1380 segs = ops->callbacks.gso_segment(skb, features); 1381 1382 if (IS_ERR_OR_NULL(segs)) 1383 goto out; 1384 1385 gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL); 1386 1387 skb = segs; 1388 do { 1389 iph = (struct iphdr *)(skb_mac_header(skb) + nhoff); 1390 if (udpfrag) { 1391 iph->frag_off = htons(offset >> 3); 1392 if (skb->next) 1393 iph->frag_off |= htons(IP_MF); 1394 offset += skb->len - nhoff - ihl; 1395 tot_len = skb->len - nhoff; 1396 } else if (skb_is_gso(skb)) { 1397 if (!fixedid) { 1398 iph->id = htons(id); 1399 id += skb_shinfo(skb)->gso_segs; 1400 } 1401 1402 if (gso_partial) 1403 tot_len = skb_shinfo(skb)->gso_size + 1404 SKB_GSO_CB(skb)->data_offset + 1405 skb->head - (unsigned char *)iph; 1406 else 1407 tot_len = skb->len - nhoff; 1408 } else { 1409 if (!fixedid) 1410 iph->id = htons(id++); 1411 tot_len = skb->len - nhoff; 1412 } 1413 iph->tot_len = htons(tot_len); 1414 ip_send_check(iph); 1415 if (encap) 1416 skb_reset_inner_headers(skb); 1417 skb->network_header = (u8 *)iph - skb->head; 1418 skb_reset_mac_len(skb); 1419 } while ((skb = skb->next)); 1420 1421 out: 1422 return segs; 1423 } 1424 1425 static struct sk_buff *ipip_gso_segment(struct sk_buff *skb, 1426 netdev_features_t features) 1427 { 1428 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_IPXIP4)) 1429 return ERR_PTR(-EINVAL); 1430 1431 return inet_gso_segment(skb, features); 1432 } 1433 1434 struct sk_buff *inet_gro_receive(struct list_head *head, struct sk_buff *skb) 1435 { 1436 const struct net_offload *ops; 1437 struct sk_buff *pp = NULL; 1438 const struct iphdr *iph; 1439 struct sk_buff *p; 1440 unsigned int hlen; 1441 unsigned int off; 1442 unsigned int id; 1443 int flush = 1; 1444 int proto; 1445 1446 off = skb_gro_offset(skb); 1447 hlen = off + sizeof(*iph); 1448 iph = skb_gro_header_fast(skb, off); 1449 if (skb_gro_header_hard(skb, hlen)) { 1450 iph = skb_gro_header_slow(skb, hlen, off); 1451 if (unlikely(!iph)) 1452 goto out; 1453 } 1454 1455 proto = iph->protocol; 1456 1457 rcu_read_lock(); 1458 ops = rcu_dereference(inet_offloads[proto]); 1459 if (!ops || !ops->callbacks.gro_receive) 1460 goto out_unlock; 1461 1462 if (*(u8 *)iph != 0x45) 1463 goto out_unlock; 1464 1465 if (ip_is_fragment(iph)) 1466 goto out_unlock; 1467 1468 if (unlikely(ip_fast_csum((u8 *)iph, 5))) 1469 goto out_unlock; 1470 1471 id = ntohl(*(__be32 *)&iph->id); 1472 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF)); 1473 id >>= 16; 1474 1475 list_for_each_entry(p, head, list) { 1476 struct iphdr *iph2; 1477 u16 flush_id; 1478 1479 if (!NAPI_GRO_CB(p)->same_flow) 1480 continue; 1481 1482 iph2 = (struct iphdr *)(p->data + off); 1483 /* The above works because, with the exception of the top 1484 * (inner most) layer, we only aggregate pkts with the same 1485 * hdr length so all the hdrs we'll need to verify will start 1486 * at the same offset. 1487 */ 1488 if ((iph->protocol ^ iph2->protocol) | 1489 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) | 1490 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) { 1491 NAPI_GRO_CB(p)->same_flow = 0; 1492 continue; 1493 } 1494 1495 /* All fields must match except length and checksum. */ 1496 NAPI_GRO_CB(p)->flush |= 1497 (iph->ttl ^ iph2->ttl) | 1498 (iph->tos ^ iph2->tos) | 1499 ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF)); 1500 1501 NAPI_GRO_CB(p)->flush |= flush; 1502 1503 /* We need to store of the IP ID check to be included later 1504 * when we can verify that this packet does in fact belong 1505 * to a given flow. 1506 */ 1507 flush_id = (u16)(id - ntohs(iph2->id)); 1508 1509 /* This bit of code makes it much easier for us to identify 1510 * the cases where we are doing atomic vs non-atomic IP ID 1511 * checks. Specifically an atomic check can return IP ID 1512 * values 0 - 0xFFFF, while a non-atomic check can only 1513 * return 0 or 0xFFFF. 1514 */ 1515 if (!NAPI_GRO_CB(p)->is_atomic || 1516 !(iph->frag_off & htons(IP_DF))) { 1517 flush_id ^= NAPI_GRO_CB(p)->count; 1518 flush_id = flush_id ? 0xFFFF : 0; 1519 } 1520 1521 /* If the previous IP ID value was based on an atomic 1522 * datagram we can overwrite the value and ignore it. 1523 */ 1524 if (NAPI_GRO_CB(skb)->is_atomic) 1525 NAPI_GRO_CB(p)->flush_id = flush_id; 1526 else 1527 NAPI_GRO_CB(p)->flush_id |= flush_id; 1528 } 1529 1530 NAPI_GRO_CB(skb)->is_atomic = !!(iph->frag_off & htons(IP_DF)); 1531 NAPI_GRO_CB(skb)->flush |= flush; 1532 skb_set_network_header(skb, off); 1533 /* The above will be needed by the transport layer if there is one 1534 * immediately following this IP hdr. 1535 */ 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_unlock: 1547 rcu_read_unlock(); 1548 1549 out: 1550 skb_gro_flush_final(skb, pp, flush); 1551 1552 return pp; 1553 } 1554 1555 static struct sk_buff *ipip_gro_receive(struct list_head *head, 1556 struct sk_buff *skb) 1557 { 1558 if (NAPI_GRO_CB(skb)->encap_mark) { 1559 NAPI_GRO_CB(skb)->flush = 1; 1560 return NULL; 1561 } 1562 1563 NAPI_GRO_CB(skb)->encap_mark = 1; 1564 1565 return inet_gro_receive(head, skb); 1566 } 1567 1568 #define SECONDS_PER_DAY 86400 1569 1570 /* inet_current_timestamp - Return IP network timestamp 1571 * 1572 * Return milliseconds since midnight in network byte order. 1573 */ 1574 __be32 inet_current_timestamp(void) 1575 { 1576 u32 secs; 1577 u32 msecs; 1578 struct timespec64 ts; 1579 1580 ktime_get_real_ts64(&ts); 1581 1582 /* Get secs since midnight. */ 1583 (void)div_u64_rem(ts.tv_sec, SECONDS_PER_DAY, &secs); 1584 /* Convert to msecs. */ 1585 msecs = secs * MSEC_PER_SEC; 1586 /* Convert nsec to msec. */ 1587 msecs += (u32)ts.tv_nsec / NSEC_PER_MSEC; 1588 1589 /* Convert to network byte order. */ 1590 return htonl(msecs); 1591 } 1592 EXPORT_SYMBOL(inet_current_timestamp); 1593 1594 int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 1595 { 1596 if (sk->sk_family == AF_INET) 1597 return ip_recv_error(sk, msg, len, addr_len); 1598 #if IS_ENABLED(CONFIG_IPV6) 1599 if (sk->sk_family == AF_INET6) 1600 return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len); 1601 #endif 1602 return -EINVAL; 1603 } 1604 1605 int inet_gro_complete(struct sk_buff *skb, int nhoff) 1606 { 1607 __be16 newlen = htons(skb->len - nhoff); 1608 struct iphdr *iph = (struct iphdr *)(skb->data + nhoff); 1609 const struct net_offload *ops; 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 csum_replace2(&iph->check, iph->tot_len, newlen); 1619 iph->tot_len = newlen; 1620 1621 rcu_read_lock(); 1622 ops = rcu_dereference(inet_offloads[proto]); 1623 if (WARN_ON(!ops || !ops->callbacks.gro_complete)) 1624 goto out_unlock; 1625 1626 /* Only need to add sizeof(*iph) to get to the next hdr below 1627 * because any hdr with option will have been flushed in 1628 * inet_gro_receive(). 1629 */ 1630 err = INDIRECT_CALL_2(ops->callbacks.gro_complete, 1631 tcp4_gro_complete, udp4_gro_complete, 1632 skb, nhoff + sizeof(*iph)); 1633 1634 out_unlock: 1635 rcu_read_unlock(); 1636 1637 return err; 1638 } 1639 1640 static int ipip_gro_complete(struct sk_buff *skb, int nhoff) 1641 { 1642 skb->encapsulation = 1; 1643 skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4; 1644 return inet_gro_complete(skb, nhoff); 1645 } 1646 1647 int inet_ctl_sock_create(struct sock **sk, unsigned short family, 1648 unsigned short type, unsigned char protocol, 1649 struct net *net) 1650 { 1651 struct socket *sock; 1652 int rc = sock_create_kern(net, family, type, protocol, &sock); 1653 1654 if (rc == 0) { 1655 *sk = sock->sk; 1656 (*sk)->sk_allocation = GFP_ATOMIC; 1657 /* 1658 * Unhash it so that IP input processing does not even see it, 1659 * we do not wish this socket to see incoming packets. 1660 */ 1661 (*sk)->sk_prot->unhash(*sk); 1662 } 1663 return rc; 1664 } 1665 EXPORT_SYMBOL_GPL(inet_ctl_sock_create); 1666 1667 unsigned long snmp_fold_field(void __percpu *mib, int offt) 1668 { 1669 unsigned long res = 0; 1670 int i; 1671 1672 for_each_possible_cpu(i) 1673 res += snmp_get_cpu_field(mib, i, offt); 1674 return res; 1675 } 1676 EXPORT_SYMBOL_GPL(snmp_fold_field); 1677 1678 #if BITS_PER_LONG==32 1679 1680 u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offt, 1681 size_t syncp_offset) 1682 { 1683 void *bhptr; 1684 struct u64_stats_sync *syncp; 1685 u64 v; 1686 unsigned int start; 1687 1688 bhptr = per_cpu_ptr(mib, cpu); 1689 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset); 1690 do { 1691 start = u64_stats_fetch_begin_irq(syncp); 1692 v = *(((u64 *)bhptr) + offt); 1693 } while (u64_stats_fetch_retry_irq(syncp, start)); 1694 1695 return v; 1696 } 1697 EXPORT_SYMBOL_GPL(snmp_get_cpu_field64); 1698 1699 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset) 1700 { 1701 u64 res = 0; 1702 int cpu; 1703 1704 for_each_possible_cpu(cpu) { 1705 res += snmp_get_cpu_field64(mib, cpu, offt, syncp_offset); 1706 } 1707 return res; 1708 } 1709 EXPORT_SYMBOL_GPL(snmp_fold_field64); 1710 #endif 1711 1712 #ifdef CONFIG_IP_MULTICAST 1713 static const struct net_protocol igmp_protocol = { 1714 .handler = igmp_rcv, 1715 }; 1716 #endif 1717 1718 /* thinking of making this const? Don't. 1719 * early_demux can change based on sysctl. 1720 */ 1721 static struct net_protocol tcp_protocol = { 1722 .early_demux = tcp_v4_early_demux, 1723 .early_demux_handler = tcp_v4_early_demux, 1724 .handler = tcp_v4_rcv, 1725 .err_handler = tcp_v4_err, 1726 .no_policy = 1, 1727 .icmp_strict_tag_validation = 1, 1728 }; 1729 1730 /* thinking of making this const? Don't. 1731 * early_demux can change based on sysctl. 1732 */ 1733 static struct net_protocol udp_protocol = { 1734 .early_demux = udp_v4_early_demux, 1735 .early_demux_handler = udp_v4_early_demux, 1736 .handler = udp_rcv, 1737 .err_handler = udp_err, 1738 .no_policy = 1, 1739 }; 1740 1741 static const struct net_protocol icmp_protocol = { 1742 .handler = icmp_rcv, 1743 .err_handler = icmp_err, 1744 .no_policy = 1, 1745 }; 1746 1747 static __net_init int ipv4_mib_init_net(struct net *net) 1748 { 1749 int i; 1750 1751 net->mib.tcp_statistics = alloc_percpu(struct tcp_mib); 1752 if (!net->mib.tcp_statistics) 1753 goto err_tcp_mib; 1754 net->mib.ip_statistics = alloc_percpu(struct ipstats_mib); 1755 if (!net->mib.ip_statistics) 1756 goto err_ip_mib; 1757 1758 for_each_possible_cpu(i) { 1759 struct ipstats_mib *af_inet_stats; 1760 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i); 1761 u64_stats_init(&af_inet_stats->syncp); 1762 } 1763 1764 net->mib.net_statistics = alloc_percpu(struct linux_mib); 1765 if (!net->mib.net_statistics) 1766 goto err_net_mib; 1767 net->mib.udp_statistics = alloc_percpu(struct udp_mib); 1768 if (!net->mib.udp_statistics) 1769 goto err_udp_mib; 1770 net->mib.udplite_statistics = alloc_percpu(struct udp_mib); 1771 if (!net->mib.udplite_statistics) 1772 goto err_udplite_mib; 1773 net->mib.icmp_statistics = alloc_percpu(struct icmp_mib); 1774 if (!net->mib.icmp_statistics) 1775 goto err_icmp_mib; 1776 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib), 1777 GFP_KERNEL); 1778 if (!net->mib.icmpmsg_statistics) 1779 goto err_icmpmsg_mib; 1780 1781 tcp_mib_init(net); 1782 return 0; 1783 1784 err_icmpmsg_mib: 1785 free_percpu(net->mib.icmp_statistics); 1786 err_icmp_mib: 1787 free_percpu(net->mib.udplite_statistics); 1788 err_udplite_mib: 1789 free_percpu(net->mib.udp_statistics); 1790 err_udp_mib: 1791 free_percpu(net->mib.net_statistics); 1792 err_net_mib: 1793 free_percpu(net->mib.ip_statistics); 1794 err_ip_mib: 1795 free_percpu(net->mib.tcp_statistics); 1796 err_tcp_mib: 1797 return -ENOMEM; 1798 } 1799 1800 static __net_exit void ipv4_mib_exit_net(struct net *net) 1801 { 1802 kfree(net->mib.icmpmsg_statistics); 1803 free_percpu(net->mib.icmp_statistics); 1804 free_percpu(net->mib.udplite_statistics); 1805 free_percpu(net->mib.udp_statistics); 1806 free_percpu(net->mib.net_statistics); 1807 free_percpu(net->mib.ip_statistics); 1808 free_percpu(net->mib.tcp_statistics); 1809 #ifdef CONFIG_MPTCP 1810 /* allocated on demand, see mptcp_init_sock() */ 1811 free_percpu(net->mib.mptcp_statistics); 1812 #endif 1813 } 1814 1815 static __net_initdata struct pernet_operations ipv4_mib_ops = { 1816 .init = ipv4_mib_init_net, 1817 .exit = ipv4_mib_exit_net, 1818 }; 1819 1820 static int __init init_ipv4_mibs(void) 1821 { 1822 return register_pernet_subsys(&ipv4_mib_ops); 1823 } 1824 1825 static __net_init int inet_init_net(struct net *net) 1826 { 1827 /* 1828 * Set defaults for local port range 1829 */ 1830 seqlock_init(&net->ipv4.ip_local_ports.lock); 1831 net->ipv4.ip_local_ports.range[0] = 32768; 1832 net->ipv4.ip_local_ports.range[1] = 60999; 1833 1834 seqlock_init(&net->ipv4.ping_group_range.lock); 1835 /* 1836 * Sane defaults - nobody may create ping sockets. 1837 * Boot scripts should set this to distro-specific group. 1838 */ 1839 net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1); 1840 net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0); 1841 1842 /* Default values for sysctl-controlled parameters. 1843 * We set them here, in case sysctl is not compiled. 1844 */ 1845 net->ipv4.sysctl_ip_default_ttl = IPDEFTTL; 1846 net->ipv4.sysctl_ip_fwd_update_priority = 1; 1847 net->ipv4.sysctl_ip_dynaddr = 0; 1848 net->ipv4.sysctl_ip_early_demux = 1; 1849 net->ipv4.sysctl_udp_early_demux = 1; 1850 net->ipv4.sysctl_tcp_early_demux = 1; 1851 net->ipv4.sysctl_nexthop_compat_mode = 1; 1852 #ifdef CONFIG_SYSCTL 1853 net->ipv4.sysctl_ip_prot_sock = PROT_SOCK; 1854 #endif 1855 1856 /* Some igmp sysctl, whose values are always used */ 1857 net->ipv4.sysctl_igmp_max_memberships = 20; 1858 net->ipv4.sysctl_igmp_max_msf = 10; 1859 /* IGMP reports for link-local multicast groups are enabled by default */ 1860 net->ipv4.sysctl_igmp_llm_reports = 1; 1861 net->ipv4.sysctl_igmp_qrv = 2; 1862 1863 net->ipv4.sysctl_fib_notify_on_flag_change = 0; 1864 1865 return 0; 1866 } 1867 1868 static __net_initdata struct pernet_operations af_inet_ops = { 1869 .init = inet_init_net, 1870 }; 1871 1872 static int __init init_inet_pernet_ops(void) 1873 { 1874 return register_pernet_subsys(&af_inet_ops); 1875 } 1876 1877 static int ipv4_proc_init(void); 1878 1879 /* 1880 * IP protocol layer initialiser 1881 */ 1882 1883 static struct packet_offload ip_packet_offload __read_mostly = { 1884 .type = cpu_to_be16(ETH_P_IP), 1885 .callbacks = { 1886 .gso_segment = inet_gso_segment, 1887 .gro_receive = inet_gro_receive, 1888 .gro_complete = inet_gro_complete, 1889 }, 1890 }; 1891 1892 static const struct net_offload ipip_offload = { 1893 .callbacks = { 1894 .gso_segment = ipip_gso_segment, 1895 .gro_receive = ipip_gro_receive, 1896 .gro_complete = ipip_gro_complete, 1897 }, 1898 }; 1899 1900 static int __init ipip_offload_init(void) 1901 { 1902 return inet_add_offload(&ipip_offload, IPPROTO_IPIP); 1903 } 1904 1905 static int __init ipv4_offload_init(void) 1906 { 1907 /* 1908 * Add offloads 1909 */ 1910 if (udpv4_offload_init() < 0) 1911 pr_crit("%s: Cannot add UDP protocol offload\n", __func__); 1912 if (tcpv4_offload_init() < 0) 1913 pr_crit("%s: Cannot add TCP protocol offload\n", __func__); 1914 if (ipip_offload_init() < 0) 1915 pr_crit("%s: Cannot add IPIP protocol offload\n", __func__); 1916 1917 dev_add_offload(&ip_packet_offload); 1918 return 0; 1919 } 1920 1921 fs_initcall(ipv4_offload_init); 1922 1923 static struct packet_type ip_packet_type __read_mostly = { 1924 .type = cpu_to_be16(ETH_P_IP), 1925 .func = ip_rcv, 1926 .list_func = ip_list_rcv, 1927 }; 1928 1929 static int __init inet_init(void) 1930 { 1931 struct inet_protosw *q; 1932 struct list_head *r; 1933 int rc; 1934 1935 sock_skb_cb_check_size(sizeof(struct inet_skb_parm)); 1936 1937 rc = proto_register(&tcp_prot, 1); 1938 if (rc) 1939 goto out; 1940 1941 rc = proto_register(&udp_prot, 1); 1942 if (rc) 1943 goto out_unregister_tcp_proto; 1944 1945 rc = proto_register(&raw_prot, 1); 1946 if (rc) 1947 goto out_unregister_udp_proto; 1948 1949 rc = proto_register(&ping_prot, 1); 1950 if (rc) 1951 goto out_unregister_raw_proto; 1952 1953 /* 1954 * Tell SOCKET that we are alive... 1955 */ 1956 1957 (void)sock_register(&inet_family_ops); 1958 1959 #ifdef CONFIG_SYSCTL 1960 ip_static_sysctl_init(); 1961 #endif 1962 1963 /* 1964 * Add all the base protocols. 1965 */ 1966 1967 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 1968 pr_crit("%s: Cannot add ICMP protocol\n", __func__); 1969 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) 1970 pr_crit("%s: Cannot add UDP protocol\n", __func__); 1971 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) 1972 pr_crit("%s: Cannot add TCP protocol\n", __func__); 1973 #ifdef CONFIG_IP_MULTICAST 1974 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 1975 pr_crit("%s: Cannot add IGMP protocol\n", __func__); 1976 #endif 1977 1978 /* Register the socket-side information for inet_create. */ 1979 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 1980 INIT_LIST_HEAD(r); 1981 1982 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 1983 inet_register_protosw(q); 1984 1985 /* 1986 * Set the ARP module up 1987 */ 1988 1989 arp_init(); 1990 1991 /* 1992 * Set the IP module up 1993 */ 1994 1995 ip_init(); 1996 1997 /* Setup TCP slab cache for open requests. */ 1998 tcp_init(); 1999 2000 /* Setup UDP memory threshold */ 2001 udp_init(); 2002 2003 /* Add UDP-Lite (RFC 3828) */ 2004 udplite4_register(); 2005 2006 raw_init(); 2007 2008 ping_init(); 2009 2010 /* 2011 * Set the ICMP layer up 2012 */ 2013 2014 if (icmp_init() < 0) 2015 panic("Failed to create the ICMP control socket.\n"); 2016 2017 /* 2018 * Initialise the multicast router 2019 */ 2020 #if defined(CONFIG_IP_MROUTE) 2021 if (ip_mr_init()) 2022 pr_crit("%s: Cannot init ipv4 mroute\n", __func__); 2023 #endif 2024 2025 if (init_inet_pernet_ops()) 2026 pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__); 2027 /* 2028 * Initialise per-cpu ipv4 mibs 2029 */ 2030 2031 if (init_ipv4_mibs()) 2032 pr_crit("%s: Cannot init ipv4 mibs\n", __func__); 2033 2034 ipv4_proc_init(); 2035 2036 ipfrag_init(); 2037 2038 dev_add_pack(&ip_packet_type); 2039 2040 ip_tunnel_core_init(); 2041 2042 rc = 0; 2043 out: 2044 return rc; 2045 out_unregister_raw_proto: 2046 proto_unregister(&raw_prot); 2047 out_unregister_udp_proto: 2048 proto_unregister(&udp_prot); 2049 out_unregister_tcp_proto: 2050 proto_unregister(&tcp_prot); 2051 goto out; 2052 } 2053 2054 fs_initcall(inet_init); 2055 2056 /* ------------------------------------------------------------------------ */ 2057 2058 #ifdef CONFIG_PROC_FS 2059 static int __init ipv4_proc_init(void) 2060 { 2061 int rc = 0; 2062 2063 if (raw_proc_init()) 2064 goto out_raw; 2065 if (tcp4_proc_init()) 2066 goto out_tcp; 2067 if (udp4_proc_init()) 2068 goto out_udp; 2069 if (ping_proc_init()) 2070 goto out_ping; 2071 if (ip_misc_proc_init()) 2072 goto out_misc; 2073 out: 2074 return rc; 2075 out_misc: 2076 ping_proc_exit(); 2077 out_ping: 2078 udp4_proc_exit(); 2079 out_udp: 2080 tcp4_proc_exit(); 2081 out_tcp: 2082 raw_proc_exit(); 2083 out_raw: 2084 rc = -ENOMEM; 2085 goto out; 2086 } 2087 2088 #else /* CONFIG_PROC_FS */ 2089 static int __init ipv4_proc_init(void) 2090 { 2091 return 0; 2092 } 2093 #endif /* CONFIG_PROC_FS */ 2094