1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * INET An implementation of the TCP/IP protocol suite for the LINUX 4 * operating system. INET is implemented using the BSD Socket 5 * interface as the means of communication with the user level. 6 * 7 * PF_INET protocol family socket handler. 8 * 9 * Authors: Ross Biro 10 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 11 * Florian La Roche, <flla@stud.uni-sb.de> 12 * Alan Cox, <A.Cox@swansea.ac.uk> 13 * 14 * Changes (see also sock.c) 15 * 16 * piggy, 17 * Karl Knutson : Socket protocol table 18 * A.N.Kuznetsov : Socket death error in accept(). 19 * John Richardson : Fix non blocking error in connect() 20 * so sockets that fail to connect 21 * don't return -EINPROGRESS. 22 * Alan Cox : Asynchronous I/O support 23 * Alan Cox : Keep correct socket pointer on sock 24 * structures 25 * when accept() ed 26 * Alan Cox : Semantics of SO_LINGER aren't state 27 * moved to close when you look carefully. 28 * With this fixed and the accept bug fixed 29 * some RPC stuff seems happier. 30 * Niibe Yutaka : 4.4BSD style write async I/O 31 * Alan Cox, 32 * Tony Gale : Fixed reuse semantics. 33 * Alan Cox : bind() shouldn't abort existing but dead 34 * sockets. Stops FTP netin:.. I hope. 35 * Alan Cox : bind() works correctly for RAW sockets. 36 * Note that FreeBSD at least was broken 37 * in this respect so be careful with 38 * compatibility tests... 39 * Alan Cox : routing cache support 40 * Alan Cox : memzero the socket structure for 41 * compactness. 42 * Matt Day : nonblock connect error handler 43 * Alan Cox : Allow large numbers of pending sockets 44 * (eg for big web sites), but only if 45 * specifically application requested. 46 * Alan Cox : New buffering throughout IP. Used 47 * dumbly. 48 * Alan Cox : New buffering now used smartly. 49 * Alan Cox : BSD rather than common sense 50 * interpretation of listen. 51 * Germano Caronni : Assorted small races. 52 * Alan Cox : sendmsg/recvmsg basic support. 53 * Alan Cox : Only sendmsg/recvmsg now supported. 54 * Alan Cox : Locked down bind (see security list). 55 * Alan Cox : Loosened bind a little. 56 * Mike McLagan : ADD/DEL DLCI Ioctls 57 * Willy Konynenberg : Transparent proxying support. 58 * David S. Miller : New socket lookup architecture. 59 * Some other random speedups. 60 * Cyrus Durgin : Cleaned up file for kmod hacks. 61 * Andi Kleen : Fix inet_stream_connect TCP race. 62 */ 63 64 #define pr_fmt(fmt) "IPv4: " fmt 65 66 #include <linux/err.h> 67 #include <linux/errno.h> 68 #include <linux/types.h> 69 #include <linux/socket.h> 70 #include <linux/in.h> 71 #include <linux/kernel.h> 72 #include <linux/kmod.h> 73 #include <linux/sched.h> 74 #include <linux/timer.h> 75 #include <linux/string.h> 76 #include <linux/sockios.h> 77 #include <linux/net.h> 78 #include <linux/capability.h> 79 #include <linux/fcntl.h> 80 #include <linux/mm.h> 81 #include <linux/interrupt.h> 82 #include <linux/stat.h> 83 #include <linux/init.h> 84 #include <linux/poll.h> 85 #include <linux/netfilter_ipv4.h> 86 #include <linux/random.h> 87 #include <linux/slab.h> 88 89 #include <linux/uaccess.h> 90 91 #include <linux/inet.h> 92 #include <linux/igmp.h> 93 #include <linux/inetdevice.h> 94 #include <linux/netdevice.h> 95 #include <net/checksum.h> 96 #include <net/ip.h> 97 #include <net/protocol.h> 98 #include <net/arp.h> 99 #include <net/route.h> 100 #include <net/ip_fib.h> 101 #include <net/inet_connection_sock.h> 102 #include <net/gro.h> 103 #include <net/gso.h> 104 #include <net/tcp.h> 105 #include <net/psp.h> 106 #include <net/udp.h> 107 #include <net/udplite.h> 108 #include <net/ping.h> 109 #include <linux/skbuff.h> 110 #include <net/sock.h> 111 #include <net/raw.h> 112 #include <net/icmp.h> 113 #include <net/inet_common.h> 114 #include <net/ip_tunnels.h> 115 #include <net/xfrm.h> 116 #include <net/net_namespace.h> 117 #include <net/secure_seq.h> 118 #ifdef CONFIG_IP_MROUTE 119 #include <linux/mroute.h> 120 #endif 121 #include <net/l3mdev.h> 122 #include <net/compat.h> 123 #include <net/rps.h> 124 125 #include <trace/events/sock.h> 126 127 /* The inetsw table contains everything that inet_create needs to 128 * build a new socket. 129 */ 130 static struct list_head inetsw[SOCK_MAX]; 131 static DEFINE_SPINLOCK(inetsw_lock); 132 133 /* New destruction routine */ 134 135 void inet_sock_destruct(struct sock *sk) 136 { 137 struct inet_sock *inet = inet_sk(sk); 138 139 __skb_queue_purge(&sk->sk_receive_queue); 140 __skb_queue_purge(&sk->sk_error_queue); 141 142 sk_mem_reclaim_final(sk); 143 144 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) { 145 pr_err("Attempt to release TCP socket in state %d %p\n", 146 sk->sk_state, sk); 147 return; 148 } 149 if (!sock_flag(sk, SOCK_DEAD)) { 150 pr_err("Attempt to release alive inet socket %p\n", sk); 151 return; 152 } 153 154 WARN_ON_ONCE(atomic_read(&sk->sk_rmem_alloc)); 155 WARN_ON_ONCE(refcount_read(&sk->sk_wmem_alloc)); 156 WARN_ON_ONCE(sk->sk_wmem_queued); 157 WARN_ON_ONCE(sk->sk_forward_alloc); 158 159 kfree(rcu_dereference_protected(inet->inet_opt, 1)); 160 dst_release(rcu_dereference_protected(sk->sk_dst_cache, 1)); 161 dst_release(rcu_dereference_protected(sk->sk_rx_dst, 1)); 162 psp_sk_assoc_free(sk); 163 } 164 EXPORT_SYMBOL(inet_sock_destruct); 165 166 /* 167 * The routines beyond this point handle the behaviour of an AF_INET 168 * socket object. Mostly it punts to the subprotocols of IP to do 169 * the work. 170 */ 171 172 /* 173 * Automatically bind an unbound socket. 174 */ 175 176 static int inet_autobind(struct sock *sk) 177 { 178 struct inet_sock *inet; 179 /* We may need to bind the socket. */ 180 lock_sock(sk); 181 inet = inet_sk(sk); 182 if (!inet->inet_num) { 183 if (sk->sk_prot->get_port(sk, 0)) { 184 release_sock(sk); 185 return -EAGAIN; 186 } 187 inet->inet_sport = htons(inet->inet_num); 188 } 189 release_sock(sk); 190 return 0; 191 } 192 193 int __inet_listen_sk(struct sock *sk, int backlog) 194 { 195 unsigned char old_state = sk->sk_state; 196 int err, tcp_fastopen; 197 198 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN))) 199 return -EINVAL; 200 201 WRITE_ONCE(sk->sk_max_ack_backlog, backlog); 202 /* Really, if the socket is already in listen state 203 * we can only allow the backlog to be adjusted. 204 */ 205 if (old_state != TCP_LISTEN) { 206 /* Enable TFO w/o requiring TCP_FASTOPEN socket option. 207 * Note that only TCP sockets (SOCK_STREAM) will reach here. 208 * Also fastopen backlog may already been set via the option 209 * because the socket was in TCP_LISTEN state previously but 210 * was shutdown() rather than close(). 211 */ 212 tcp_fastopen = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_fastopen); 213 if ((tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) && 214 (tcp_fastopen & TFO_SERVER_ENABLE) && 215 !inet_csk(sk)->icsk_accept_queue.fastopenq.max_qlen) { 216 fastopen_queue_tune(sk, backlog); 217 tcp_fastopen_init_key_once(sock_net(sk)); 218 } 219 220 err = inet_csk_listen_start(sk); 221 if (err) 222 return err; 223 224 tcp_call_bpf(sk, BPF_SOCK_OPS_TCP_LISTEN_CB, 0, NULL); 225 } 226 return 0; 227 } 228 229 /* 230 * Move a socket into listening state. 231 */ 232 int inet_listen(struct socket *sock, int backlog) 233 { 234 struct sock *sk = sock->sk; 235 int err = -EINVAL; 236 237 lock_sock(sk); 238 239 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM) 240 goto out; 241 242 err = __inet_listen_sk(sk, backlog); 243 244 out: 245 release_sock(sk); 246 return err; 247 } 248 EXPORT_SYMBOL(inet_listen); 249 250 /* 251 * Create an inet socket. 252 */ 253 254 static int inet_create(struct net *net, struct socket *sock, int protocol, 255 int kern) 256 { 257 struct sock *sk; 258 struct inet_protosw *answer; 259 struct inet_sock *inet; 260 struct proto *answer_prot; 261 unsigned char answer_flags; 262 int try_loading_module = 0; 263 int err; 264 265 if (protocol < 0 || protocol >= IPPROTO_MAX) 266 return -EINVAL; 267 268 sock->state = SS_UNCONNECTED; 269 270 /* Look for the requested type/protocol pair. */ 271 lookup_protocol: 272 err = -ESOCKTNOSUPPORT; 273 rcu_read_lock(); 274 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) { 275 276 err = 0; 277 /* Check the non-wild match. */ 278 if (protocol == answer->protocol) { 279 if (protocol != IPPROTO_IP) 280 break; 281 } else { 282 /* Check for the two wild cases. */ 283 if (IPPROTO_IP == protocol) { 284 protocol = answer->protocol; 285 break; 286 } 287 if (IPPROTO_IP == answer->protocol) 288 break; 289 } 290 err = -EPROTONOSUPPORT; 291 } 292 293 if (unlikely(err)) { 294 if (try_loading_module < 2) { 295 rcu_read_unlock(); 296 /* 297 * Be more specific, e.g. net-pf-2-proto-132-type-1 298 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) 299 */ 300 if (++try_loading_module == 1) 301 request_module("net-pf-%d-proto-%d-type-%d", 302 PF_INET, protocol, sock->type); 303 /* 304 * Fall back to generic, e.g. net-pf-2-proto-132 305 * (net-pf-PF_INET-proto-IPPROTO_SCTP) 306 */ 307 else 308 request_module("net-pf-%d-proto-%d", 309 PF_INET, protocol); 310 goto lookup_protocol; 311 } else 312 goto out_rcu_unlock; 313 } 314 315 err = -EPERM; 316 if (sock->type == SOCK_RAW && !kern && 317 !ns_capable(net->user_ns, CAP_NET_RAW)) 318 goto out_rcu_unlock; 319 320 sock->ops = answer->ops; 321 answer_prot = answer->prot; 322 answer_flags = answer->flags; 323 rcu_read_unlock(); 324 325 WARN_ON(!answer_prot->slab); 326 327 err = -ENOMEM; 328 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot, kern); 329 if (!sk) 330 goto out; 331 332 err = 0; 333 if (INET_PROTOSW_REUSE & answer_flags) 334 sk->sk_reuse = SK_CAN_REUSE; 335 336 if (INET_PROTOSW_ICSK & answer_flags) 337 inet_init_csk_locks(sk); 338 339 inet = inet_sk(sk); 340 inet_assign_bit(IS_ICSK, sk, INET_PROTOSW_ICSK & answer_flags); 341 342 inet_clear_bit(NODEFRAG, sk); 343 344 if (SOCK_RAW == sock->type) { 345 inet->inet_num = protocol; 346 if (IPPROTO_RAW == protocol) 347 inet_set_bit(HDRINCL, sk); 348 } 349 350 if (READ_ONCE(net->ipv4.sysctl_ip_no_pmtu_disc)) 351 inet->pmtudisc = IP_PMTUDISC_DONT; 352 else 353 inet->pmtudisc = IP_PMTUDISC_WANT; 354 355 atomic_set(&inet->inet_id, 0); 356 357 sock_init_data(sock, sk); 358 359 sk->sk_destruct = inet_sock_destruct; 360 sk->sk_protocol = protocol; 361 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 362 sk->sk_txrehash = READ_ONCE(net->core.sysctl_txrehash); 363 364 inet->uc_ttl = -1; 365 inet_set_bit(MC_LOOP, sk); 366 inet->mc_ttl = 1; 367 inet_set_bit(MC_ALL, sk); 368 inet->mc_index = 0; 369 inet->mc_list = NULL; 370 inet->rcv_tos = 0; 371 372 if (inet->inet_num) { 373 /* It assumes that any protocol which allows 374 * the user to assign a number at socket 375 * creation time automatically 376 * shares. 377 */ 378 inet->inet_sport = htons(inet->inet_num); 379 /* Add to protocol hash chains. */ 380 err = sk->sk_prot->hash(sk); 381 if (err) 382 goto out_sk_release; 383 } 384 385 if (sk->sk_prot->init) { 386 err = sk->sk_prot->init(sk); 387 if (err) 388 goto out_sk_release; 389 } 390 391 if (!kern) { 392 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk); 393 if (err) 394 goto out_sk_release; 395 } 396 out: 397 return err; 398 out_rcu_unlock: 399 rcu_read_unlock(); 400 goto out; 401 out_sk_release: 402 sk_common_release(sk); 403 sock->sk = NULL; 404 goto out; 405 } 406 407 408 /* 409 * The peer socket should always be NULL (or else). When we call this 410 * function we are destroying the object and from then on nobody 411 * should refer to it. 412 */ 413 int inet_release(struct socket *sock) 414 { 415 struct sock *sk = sock->sk; 416 417 if (sk) { 418 long timeout; 419 420 if (!sk->sk_kern_sock) 421 BPF_CGROUP_RUN_PROG_INET_SOCK_RELEASE(sk); 422 423 /* Applications forget to leave groups before exiting */ 424 ip_mc_drop_socket(sk); 425 426 /* If linger is set, we don't return until the close 427 * is complete. Otherwise we return immediately. The 428 * actually closing is done the same either way. 429 * 430 * If the close is due to the process exiting, we never 431 * linger.. 432 */ 433 timeout = 0; 434 if (sock_flag(sk, SOCK_LINGER) && 435 !(current->flags & PF_EXITING)) 436 timeout = sk->sk_lingertime; 437 sk->sk_prot->close(sk, timeout); 438 sock->sk = NULL; 439 } 440 return 0; 441 } 442 EXPORT_SYMBOL(inet_release); 443 444 int inet_bind_sk(struct sock *sk, struct sockaddr *uaddr, int addr_len) 445 { 446 u32 flags = BIND_WITH_LOCK; 447 int err; 448 449 /* If the socket has its own bind function then use it. (RAW) */ 450 if (sk->sk_prot->bind) { 451 return sk->sk_prot->bind(sk, uaddr, addr_len); 452 } 453 if (addr_len < sizeof(struct sockaddr_in)) 454 return -EINVAL; 455 456 /* BPF prog is run before any checks are done so that if the prog 457 * changes context in a wrong way it will be caught. 458 */ 459 err = BPF_CGROUP_RUN_PROG_INET_BIND_LOCK(sk, uaddr, &addr_len, 460 CGROUP_INET4_BIND, &flags); 461 if (err) 462 return err; 463 464 return __inet_bind(sk, uaddr, addr_len, flags); 465 } 466 467 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 468 { 469 return inet_bind_sk(sock->sk, uaddr, addr_len); 470 } 471 EXPORT_SYMBOL(inet_bind); 472 473 int __inet_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len, 474 u32 flags) 475 { 476 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 477 struct inet_sock *inet = inet_sk(sk); 478 struct net *net = sock_net(sk); 479 unsigned short snum; 480 int chk_addr_ret; 481 u32 tb_id = RT_TABLE_LOCAL; 482 int err; 483 484 if (addr->sin_family != AF_INET) { 485 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET) 486 * only if s_addr is INADDR_ANY. 487 */ 488 err = -EAFNOSUPPORT; 489 if (addr->sin_family != AF_UNSPEC || 490 addr->sin_addr.s_addr != htonl(INADDR_ANY)) 491 goto out; 492 } 493 494 tb_id = l3mdev_fib_table_by_index(net, sk->sk_bound_dev_if) ? : tb_id; 495 chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id); 496 497 /* Not specified by any standard per-se, however it breaks too 498 * many applications when removed. It is unfortunate since 499 * allowing applications to make a non-local bind solves 500 * several problems with systems using dynamic addressing. 501 * (ie. your servers still start up even if your ISDN link 502 * is temporarily down) 503 */ 504 err = -EADDRNOTAVAIL; 505 if (!inet_addr_valid_or_nonlocal(net, inet, addr->sin_addr.s_addr, 506 chk_addr_ret)) 507 goto out; 508 509 snum = ntohs(addr->sin_port); 510 err = -EACCES; 511 if (!(flags & BIND_NO_CAP_NET_BIND_SERVICE) && 512 snum && inet_port_requires_bind_service(net, snum) && 513 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 514 goto out; 515 516 /* We keep a pair of addresses. rcv_saddr is the one 517 * used by hash lookups, and saddr is used for transmit. 518 * 519 * In the BSD API these are the same except where it 520 * would be illegal to use them (multicast/broadcast) in 521 * which case the sending device address is used. 522 */ 523 if (flags & BIND_WITH_LOCK) 524 lock_sock(sk); 525 526 /* Check these errors (active socket, double bind). */ 527 err = -EINVAL; 528 if (sk->sk_state != TCP_CLOSE || inet->inet_num) 529 goto out_release_sock; 530 531 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 532 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 533 inet->inet_saddr = 0; /* Use device */ 534 535 /* Make sure we are allowed to bind here. */ 536 if (snum || !(inet_test_bit(BIND_ADDRESS_NO_PORT, sk) || 537 (flags & BIND_FORCE_ADDRESS_NO_PORT))) { 538 err = sk->sk_prot->get_port(sk, snum); 539 if (err) { 540 inet->inet_saddr = inet->inet_rcv_saddr = 0; 541 goto out_release_sock; 542 } 543 if (!(flags & BIND_FROM_BPF)) { 544 err = BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk); 545 if (err) { 546 inet->inet_saddr = inet->inet_rcv_saddr = 0; 547 if (sk->sk_prot->put_port) 548 sk->sk_prot->put_port(sk); 549 goto out_release_sock; 550 } 551 } 552 } 553 554 if (inet->inet_rcv_saddr) 555 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 556 if (snum) 557 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 558 inet->inet_sport = htons(inet->inet_num); 559 inet->inet_daddr = 0; 560 inet->inet_dport = 0; 561 sk_dst_reset(sk); 562 err = 0; 563 out_release_sock: 564 if (flags & BIND_WITH_LOCK) 565 release_sock(sk); 566 out: 567 return err; 568 } 569 570 int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr, 571 int addr_len, int flags) 572 { 573 struct sock *sk = sock->sk; 574 const struct proto *prot; 575 int err; 576 577 if (addr_len < sizeof(uaddr->sa_family)) 578 return -EINVAL; 579 580 /* IPV6_ADDRFORM can change sk->sk_prot under us. */ 581 prot = READ_ONCE(sk->sk_prot); 582 583 if (uaddr->sa_family == AF_UNSPEC) 584 return prot->disconnect(sk, flags); 585 586 if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) { 587 err = prot->pre_connect(sk, uaddr, addr_len); 588 if (err) 589 return err; 590 } 591 592 if (data_race(!inet_sk(sk)->inet_num) && inet_autobind(sk)) 593 return -EAGAIN; 594 return prot->connect(sk, uaddr, addr_len); 595 } 596 EXPORT_SYMBOL(inet_dgram_connect); 597 598 static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias) 599 { 600 DEFINE_WAIT_FUNC(wait, woken_wake_function); 601 602 add_wait_queue(sk_sleep(sk), &wait); 603 sk->sk_write_pending += writebias; 604 605 /* Basic assumption: if someone sets sk->sk_err, he _must_ 606 * change state of the socket from TCP_SYN_*. 607 * Connect() does not allow to get error notifications 608 * without closing the socket. 609 */ 610 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 611 release_sock(sk); 612 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo); 613 lock_sock(sk); 614 if (signal_pending(current) || !timeo) 615 break; 616 } 617 remove_wait_queue(sk_sleep(sk), &wait); 618 sk->sk_write_pending -= writebias; 619 return timeo; 620 } 621 622 /* 623 * Connect to a remote host. There is regrettably still a little 624 * TCP 'magic' in here. 625 */ 626 int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 627 int addr_len, int flags, int is_sendmsg) 628 { 629 struct sock *sk = sock->sk; 630 int err; 631 long timeo; 632 633 /* 634 * uaddr can be NULL and addr_len can be 0 if: 635 * sk is a TCP fastopen active socket and 636 * TCP_FASTOPEN_CONNECT sockopt is set and 637 * we already have a valid cookie for this socket. 638 * In this case, user can call write() after connect(). 639 * write() will invoke tcp_sendmsg_fastopen() which calls 640 * __inet_stream_connect(). 641 */ 642 if (uaddr) { 643 if (addr_len < sizeof(uaddr->sa_family)) 644 return -EINVAL; 645 646 if (uaddr->sa_family == AF_UNSPEC) { 647 sk->sk_disconnects++; 648 err = sk->sk_prot->disconnect(sk, flags); 649 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 650 goto out; 651 } 652 } 653 654 switch (sock->state) { 655 default: 656 err = -EINVAL; 657 goto out; 658 case SS_CONNECTED: 659 err = -EISCONN; 660 goto out; 661 case SS_CONNECTING: 662 if (inet_test_bit(DEFER_CONNECT, sk)) 663 err = is_sendmsg ? -EINPROGRESS : -EISCONN; 664 else 665 err = -EALREADY; 666 /* Fall out of switch with err, set for this state */ 667 break; 668 case SS_UNCONNECTED: 669 err = -EISCONN; 670 if (sk->sk_state != TCP_CLOSE) 671 goto out; 672 673 if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) { 674 err = sk->sk_prot->pre_connect(sk, uaddr, addr_len); 675 if (err) 676 goto out; 677 } 678 679 err = sk->sk_prot->connect(sk, uaddr, addr_len); 680 if (err < 0) 681 goto out; 682 683 sock->state = SS_CONNECTING; 684 685 if (!err && inet_test_bit(DEFER_CONNECT, sk)) 686 goto out; 687 688 /* Just entered SS_CONNECTING state; the only 689 * difference is that return value in non-blocking 690 * case is EINPROGRESS, rather than EALREADY. 691 */ 692 err = -EINPROGRESS; 693 break; 694 } 695 696 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 697 698 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 699 int writebias = (sk->sk_protocol == IPPROTO_TCP) && 700 tcp_sk(sk)->fastopen_req && 701 tcp_sk(sk)->fastopen_req->data ? 1 : 0; 702 int dis = sk->sk_disconnects; 703 704 /* Error code is set above */ 705 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias)) 706 goto out; 707 708 err = sock_intr_errno(timeo); 709 if (signal_pending(current)) 710 goto out; 711 712 if (dis != sk->sk_disconnects) { 713 err = -EPIPE; 714 goto out; 715 } 716 } 717 718 /* Connection was closed by RST, timeout, ICMP error 719 * or another process disconnected us. 720 */ 721 if (sk->sk_state == TCP_CLOSE) 722 goto sock_error; 723 724 /* sk->sk_err may be not zero now, if RECVERR was ordered by user 725 * and error was received after socket entered established state. 726 * Hence, it is handled normally after connect() return successfully. 727 */ 728 729 sock->state = SS_CONNECTED; 730 err = 0; 731 out: 732 return err; 733 734 sock_error: 735 err = sock_error(sk) ? : -ECONNABORTED; 736 sock->state = SS_UNCONNECTED; 737 sk->sk_disconnects++; 738 if (sk->sk_prot->disconnect(sk, flags)) 739 sock->state = SS_DISCONNECTING; 740 goto out; 741 } 742 EXPORT_SYMBOL(__inet_stream_connect); 743 744 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 745 int addr_len, int flags) 746 { 747 int err; 748 749 lock_sock(sock->sk); 750 err = __inet_stream_connect(sock, uaddr, addr_len, flags, 0); 751 release_sock(sock->sk); 752 return err; 753 } 754 EXPORT_SYMBOL(inet_stream_connect); 755 756 void __inet_accept(struct socket *sock, struct socket *newsock, struct sock *newsk) 757 { 758 /* TODO: use sk_clone_lock() in SCTP and remove protocol checks */ 759 if (mem_cgroup_sockets_enabled && 760 (!IS_ENABLED(CONFIG_IP_SCTP) || sk_is_tcp(newsk))) { 761 gfp_t gfp = GFP_KERNEL | __GFP_NOFAIL; 762 763 mem_cgroup_sk_alloc(newsk); 764 765 if (mem_cgroup_from_sk(newsk)) { 766 int amt; 767 768 /* The socket has not been accepted yet, no need 769 * to look at newsk->sk_wmem_queued. 770 */ 771 amt = sk_mem_pages(newsk->sk_forward_alloc + 772 atomic_read(&newsk->sk_rmem_alloc)); 773 if (amt) 774 mem_cgroup_sk_charge(newsk, amt, gfp); 775 } 776 777 kmem_cache_charge(newsk, gfp); 778 } 779 780 sock_rps_record_flow(newsk); 781 WARN_ON(!((1 << newsk->sk_state) & 782 (TCPF_ESTABLISHED | TCPF_SYN_RECV | 783 TCPF_FIN_WAIT1 | TCPF_FIN_WAIT2 | 784 TCPF_CLOSING | TCPF_CLOSE_WAIT | 785 TCPF_CLOSE))); 786 787 if (test_bit(SOCK_SUPPORT_ZC, &sock->flags)) 788 set_bit(SOCK_SUPPORT_ZC, &newsock->flags); 789 sock_graft(newsk, newsock); 790 791 newsock->state = SS_CONNECTED; 792 } 793 794 /* 795 * Accept a pending connection. The TCP layer now gives BSD semantics. 796 */ 797 798 int inet_accept(struct socket *sock, struct socket *newsock, 799 struct proto_accept_arg *arg) 800 { 801 struct sock *sk1 = sock->sk, *sk2; 802 803 /* IPV6_ADDRFORM can change sk->sk_prot under us. */ 804 arg->err = -EINVAL; 805 sk2 = READ_ONCE(sk1->sk_prot)->accept(sk1, arg); 806 if (!sk2) 807 return arg->err; 808 809 lock_sock(sk2); 810 __inet_accept(sock, newsock, sk2); 811 release_sock(sk2); 812 return 0; 813 } 814 EXPORT_SYMBOL(inet_accept); 815 816 /* 817 * This does both peername and sockname. 818 */ 819 int inet_getname(struct socket *sock, struct sockaddr *uaddr, 820 int peer) 821 { 822 struct sock *sk = sock->sk; 823 struct inet_sock *inet = inet_sk(sk); 824 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr); 825 int sin_addr_len = sizeof(*sin); 826 827 sin->sin_family = AF_INET; 828 lock_sock(sk); 829 if (peer) { 830 if (!inet->inet_dport || 831 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 832 peer == 1)) { 833 release_sock(sk); 834 return -ENOTCONN; 835 } 836 sin->sin_port = inet->inet_dport; 837 sin->sin_addr.s_addr = inet->inet_daddr; 838 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin, &sin_addr_len, 839 CGROUP_INET4_GETPEERNAME); 840 } else { 841 __be32 addr = inet->inet_rcv_saddr; 842 if (!addr) 843 addr = inet->inet_saddr; 844 sin->sin_port = inet->inet_sport; 845 sin->sin_addr.s_addr = addr; 846 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin, &sin_addr_len, 847 CGROUP_INET4_GETSOCKNAME); 848 } 849 release_sock(sk); 850 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 851 return sin_addr_len; 852 } 853 EXPORT_SYMBOL(inet_getname); 854 855 int inet_send_prepare(struct sock *sk) 856 { 857 sock_rps_record_flow(sk); 858 859 /* We may need to bind the socket. */ 860 if (data_race(!inet_sk(sk)->inet_num) && !sk->sk_prot->no_autobind && 861 inet_autobind(sk)) 862 return -EAGAIN; 863 864 return 0; 865 } 866 EXPORT_SYMBOL_GPL(inet_send_prepare); 867 868 int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) 869 { 870 struct sock *sk = sock->sk; 871 872 if (unlikely(inet_send_prepare(sk))) 873 return -EAGAIN; 874 875 return INDIRECT_CALL_2(sk->sk_prot->sendmsg, tcp_sendmsg, udp_sendmsg, 876 sk, msg, size); 877 } 878 EXPORT_SYMBOL(inet_sendmsg); 879 880 void inet_splice_eof(struct socket *sock) 881 { 882 const struct proto *prot; 883 struct sock *sk = sock->sk; 884 885 if (unlikely(inet_send_prepare(sk))) 886 return; 887 888 /* IPV6_ADDRFORM can change sk->sk_prot under us. */ 889 prot = READ_ONCE(sk->sk_prot); 890 if (prot->splice_eof) 891 prot->splice_eof(sock); 892 } 893 EXPORT_SYMBOL_GPL(inet_splice_eof); 894 895 INDIRECT_CALLABLE_DECLARE(int udp_recvmsg(struct sock *, struct msghdr *, 896 size_t, int, int *)); 897 int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 898 int flags) 899 { 900 struct sock *sk = sock->sk; 901 int addr_len = 0; 902 int err; 903 904 if (likely(!(flags & MSG_ERRQUEUE))) 905 sock_rps_record_flow(sk); 906 907 err = INDIRECT_CALL_2(sk->sk_prot->recvmsg, tcp_recvmsg, udp_recvmsg, 908 sk, msg, size, flags, &addr_len); 909 if (err >= 0) 910 msg->msg_namelen = addr_len; 911 return err; 912 } 913 EXPORT_SYMBOL(inet_recvmsg); 914 915 int inet_shutdown(struct socket *sock, int how) 916 { 917 struct sock *sk = sock->sk; 918 int err = 0; 919 920 /* This should really check to make sure 921 * the socket is a TCP socket. (WHY AC...) 922 */ 923 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and 924 1->2 bit 2 snds. 925 2->3 */ 926 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ 927 return -EINVAL; 928 929 lock_sock(sk); 930 if (sock->state == SS_CONNECTING) { 931 if ((1 << sk->sk_state) & 932 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) 933 sock->state = SS_DISCONNECTING; 934 else 935 sock->state = SS_CONNECTED; 936 } 937 938 switch (sk->sk_state) { 939 case TCP_CLOSE: 940 err = -ENOTCONN; 941 /* Hack to wake up other listeners, who can poll for 942 EPOLLHUP, even on eg. unconnected UDP sockets -- RR */ 943 fallthrough; 944 default: 945 WRITE_ONCE(sk->sk_shutdown, sk->sk_shutdown | how); 946 if (sk->sk_prot->shutdown) 947 sk->sk_prot->shutdown(sk, how); 948 break; 949 950 /* Remaining two branches are temporary solution for missing 951 * close() in multithreaded environment. It is _not_ a good idea, 952 * but we have no choice until close() is repaired at VFS level. 953 */ 954 case TCP_LISTEN: 955 if (!(how & RCV_SHUTDOWN)) 956 break; 957 fallthrough; 958 case TCP_SYN_SENT: 959 err = sk->sk_prot->disconnect(sk, O_NONBLOCK); 960 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 961 break; 962 } 963 964 /* Wake up anyone sleeping in poll. */ 965 sk->sk_state_change(sk); 966 release_sock(sk); 967 return err; 968 } 969 EXPORT_SYMBOL(inet_shutdown); 970 971 /* 972 * ioctl() calls you can issue on an INET socket. Most of these are 973 * device configuration and stuff and very rarely used. Some ioctls 974 * pass on to the socket itself. 975 * 976 * NOTE: I like the idea of a module for the config stuff. ie ifconfig 977 * loads the devconfigure module does its configuring and unloads it. 978 * There's a good 20K of config code hanging around the kernel. 979 */ 980 981 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 982 { 983 struct sock *sk = sock->sk; 984 int err = 0; 985 struct net *net = sock_net(sk); 986 void __user *p = (void __user *)arg; 987 struct ifreq ifr; 988 struct rtentry rt; 989 990 switch (cmd) { 991 case SIOCADDRT: 992 case SIOCDELRT: 993 if (copy_from_user(&rt, p, sizeof(struct rtentry))) 994 return -EFAULT; 995 err = ip_rt_ioctl(net, cmd, &rt); 996 break; 997 case SIOCRTMSG: 998 err = -EINVAL; 999 break; 1000 case SIOCDARP: 1001 case SIOCGARP: 1002 case SIOCSARP: 1003 err = arp_ioctl(net, cmd, (void __user *)arg); 1004 break; 1005 case SIOCGIFADDR: 1006 case SIOCGIFBRDADDR: 1007 case SIOCGIFNETMASK: 1008 case SIOCGIFDSTADDR: 1009 case SIOCGIFPFLAGS: 1010 if (get_user_ifreq(&ifr, NULL, p)) 1011 return -EFAULT; 1012 err = devinet_ioctl(net, cmd, &ifr); 1013 if (!err && put_user_ifreq(&ifr, p)) 1014 err = -EFAULT; 1015 break; 1016 1017 case SIOCSIFADDR: 1018 case SIOCSIFBRDADDR: 1019 case SIOCSIFNETMASK: 1020 case SIOCSIFDSTADDR: 1021 case SIOCSIFPFLAGS: 1022 case SIOCSIFFLAGS: 1023 if (get_user_ifreq(&ifr, NULL, p)) 1024 return -EFAULT; 1025 err = devinet_ioctl(net, cmd, &ifr); 1026 break; 1027 default: 1028 if (sk->sk_prot->ioctl) 1029 err = sk_ioctl(sk, cmd, (void __user *)arg); 1030 else 1031 err = -ENOIOCTLCMD; 1032 break; 1033 } 1034 return err; 1035 } 1036 EXPORT_SYMBOL(inet_ioctl); 1037 1038 #ifdef CONFIG_COMPAT 1039 static int inet_compat_routing_ioctl(struct sock *sk, unsigned int cmd, 1040 struct compat_rtentry __user *ur) 1041 { 1042 compat_uptr_t rtdev; 1043 struct rtentry rt; 1044 1045 if (copy_from_user(&rt.rt_dst, &ur->rt_dst, 1046 3 * sizeof(struct sockaddr)) || 1047 get_user(rt.rt_flags, &ur->rt_flags) || 1048 get_user(rt.rt_metric, &ur->rt_metric) || 1049 get_user(rt.rt_mtu, &ur->rt_mtu) || 1050 get_user(rt.rt_window, &ur->rt_window) || 1051 get_user(rt.rt_irtt, &ur->rt_irtt) || 1052 get_user(rtdev, &ur->rt_dev)) 1053 return -EFAULT; 1054 1055 rt.rt_dev = compat_ptr(rtdev); 1056 return ip_rt_ioctl(sock_net(sk), cmd, &rt); 1057 } 1058 1059 static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1060 { 1061 void __user *argp = compat_ptr(arg); 1062 struct sock *sk = sock->sk; 1063 1064 switch (cmd) { 1065 case SIOCADDRT: 1066 case SIOCDELRT: 1067 return inet_compat_routing_ioctl(sk, cmd, argp); 1068 default: 1069 if (!sk->sk_prot->compat_ioctl) 1070 return -ENOIOCTLCMD; 1071 return sk->sk_prot->compat_ioctl(sk, cmd, arg); 1072 } 1073 } 1074 #endif /* CONFIG_COMPAT */ 1075 1076 const struct proto_ops inet_stream_ops = { 1077 .family = PF_INET, 1078 .owner = THIS_MODULE, 1079 .release = inet_release, 1080 .bind = inet_bind, 1081 .connect = inet_stream_connect, 1082 .socketpair = sock_no_socketpair, 1083 .accept = inet_accept, 1084 .getname = inet_getname, 1085 .poll = tcp_poll, 1086 .ioctl = inet_ioctl, 1087 .gettstamp = sock_gettstamp, 1088 .listen = inet_listen, 1089 .shutdown = inet_shutdown, 1090 .setsockopt = sock_common_setsockopt, 1091 .getsockopt = sock_common_getsockopt, 1092 .sendmsg = inet_sendmsg, 1093 .recvmsg = inet_recvmsg, 1094 #ifdef CONFIG_MMU 1095 .mmap = tcp_mmap, 1096 #endif 1097 .splice_eof = inet_splice_eof, 1098 .splice_read = tcp_splice_read, 1099 .set_peek_off = sk_set_peek_off, 1100 .read_sock = tcp_read_sock, 1101 .read_skb = tcp_read_skb, 1102 .sendmsg_locked = tcp_sendmsg_locked, 1103 .peek_len = tcp_peek_len, 1104 #ifdef CONFIG_COMPAT 1105 .compat_ioctl = inet_compat_ioctl, 1106 #endif 1107 .set_rcvlowat = tcp_set_rcvlowat, 1108 }; 1109 EXPORT_SYMBOL(inet_stream_ops); 1110 1111 const struct proto_ops inet_dgram_ops = { 1112 .family = PF_INET, 1113 .owner = THIS_MODULE, 1114 .release = inet_release, 1115 .bind = inet_bind, 1116 .connect = inet_dgram_connect, 1117 .socketpair = sock_no_socketpair, 1118 .accept = sock_no_accept, 1119 .getname = inet_getname, 1120 .poll = udp_poll, 1121 .ioctl = inet_ioctl, 1122 .gettstamp = sock_gettstamp, 1123 .listen = sock_no_listen, 1124 .shutdown = inet_shutdown, 1125 .setsockopt = sock_common_setsockopt, 1126 .getsockopt = sock_common_getsockopt, 1127 .sendmsg = inet_sendmsg, 1128 .read_skb = udp_read_skb, 1129 .recvmsg = inet_recvmsg, 1130 .mmap = sock_no_mmap, 1131 .splice_eof = inet_splice_eof, 1132 .set_peek_off = udp_set_peek_off, 1133 #ifdef CONFIG_COMPAT 1134 .compat_ioctl = inet_compat_ioctl, 1135 #endif 1136 }; 1137 EXPORT_SYMBOL(inet_dgram_ops); 1138 1139 /* 1140 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 1141 * udp_poll 1142 */ 1143 static const struct proto_ops inet_sockraw_ops = { 1144 .family = PF_INET, 1145 .owner = THIS_MODULE, 1146 .release = inet_release, 1147 .bind = inet_bind, 1148 .connect = inet_dgram_connect, 1149 .socketpair = sock_no_socketpair, 1150 .accept = sock_no_accept, 1151 .getname = inet_getname, 1152 .poll = datagram_poll, 1153 .ioctl = inet_ioctl, 1154 .gettstamp = sock_gettstamp, 1155 .listen = sock_no_listen, 1156 .shutdown = inet_shutdown, 1157 .setsockopt = sock_common_setsockopt, 1158 .getsockopt = sock_common_getsockopt, 1159 .sendmsg = inet_sendmsg, 1160 .recvmsg = inet_recvmsg, 1161 .mmap = sock_no_mmap, 1162 .splice_eof = inet_splice_eof, 1163 #ifdef CONFIG_COMPAT 1164 .compat_ioctl = inet_compat_ioctl, 1165 #endif 1166 }; 1167 1168 static const struct net_proto_family inet_family_ops = { 1169 .family = PF_INET, 1170 .create = inet_create, 1171 .owner = THIS_MODULE, 1172 }; 1173 1174 /* Upon startup we insert all the elements in inetsw_array[] into 1175 * the linked list inetsw. 1176 */ 1177 static struct inet_protosw inetsw_array[] = 1178 { 1179 { 1180 .type = SOCK_STREAM, 1181 .protocol = IPPROTO_TCP, 1182 .prot = &tcp_prot, 1183 .ops = &inet_stream_ops, 1184 .flags = INET_PROTOSW_PERMANENT | 1185 INET_PROTOSW_ICSK, 1186 }, 1187 1188 { 1189 .type = SOCK_DGRAM, 1190 .protocol = IPPROTO_UDP, 1191 .prot = &udp_prot, 1192 .ops = &inet_dgram_ops, 1193 .flags = INET_PROTOSW_PERMANENT, 1194 }, 1195 1196 { 1197 .type = SOCK_DGRAM, 1198 .protocol = IPPROTO_ICMP, 1199 .prot = &ping_prot, 1200 .ops = &inet_sockraw_ops, 1201 .flags = INET_PROTOSW_REUSE, 1202 }, 1203 1204 { 1205 .type = SOCK_RAW, 1206 .protocol = IPPROTO_IP, /* wild card */ 1207 .prot = &raw_prot, 1208 .ops = &inet_sockraw_ops, 1209 .flags = INET_PROTOSW_REUSE, 1210 } 1211 }; 1212 1213 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) 1214 1215 void inet_register_protosw(struct inet_protosw *p) 1216 { 1217 struct list_head *lh; 1218 struct inet_protosw *answer; 1219 int protocol = p->protocol; 1220 struct list_head *last_perm; 1221 1222 spin_lock_bh(&inetsw_lock); 1223 1224 if (p->type >= SOCK_MAX) 1225 goto out_illegal; 1226 1227 /* If we are trying to override a permanent protocol, bail. */ 1228 last_perm = &inetsw[p->type]; 1229 list_for_each(lh, &inetsw[p->type]) { 1230 answer = list_entry(lh, struct inet_protosw, list); 1231 /* Check only the non-wild match. */ 1232 if ((INET_PROTOSW_PERMANENT & answer->flags) == 0) 1233 break; 1234 if (protocol == answer->protocol) 1235 goto out_permanent; 1236 last_perm = lh; 1237 } 1238 1239 /* Add the new entry after the last permanent entry if any, so that 1240 * the new entry does not override a permanent entry when matched with 1241 * a wild-card protocol. But it is allowed to override any existing 1242 * non-permanent entry. This means that when we remove this entry, the 1243 * system automatically returns to the old behavior. 1244 */ 1245 list_add_rcu(&p->list, last_perm); 1246 out: 1247 spin_unlock_bh(&inetsw_lock); 1248 1249 return; 1250 1251 out_permanent: 1252 pr_err("Attempt to override permanent protocol %d\n", protocol); 1253 goto out; 1254 1255 out_illegal: 1256 pr_err("Ignoring attempt to register invalid socket type %d\n", 1257 p->type); 1258 goto out; 1259 } 1260 EXPORT_SYMBOL(inet_register_protosw); 1261 1262 void inet_unregister_protosw(struct inet_protosw *p) 1263 { 1264 if (INET_PROTOSW_PERMANENT & p->flags) { 1265 pr_err("Attempt to unregister permanent protocol %d\n", 1266 p->protocol); 1267 } else { 1268 spin_lock_bh(&inetsw_lock); 1269 list_del_rcu(&p->list); 1270 spin_unlock_bh(&inetsw_lock); 1271 1272 synchronize_net(); 1273 } 1274 } 1275 EXPORT_SYMBOL(inet_unregister_protosw); 1276 1277 static int inet_sk_reselect_saddr(struct sock *sk) 1278 { 1279 struct inet_sock *inet = inet_sk(sk); 1280 __be32 old_saddr = inet->inet_saddr; 1281 __be32 daddr = inet->inet_daddr; 1282 struct flowi4 *fl4; 1283 struct rtable *rt; 1284 __be32 new_saddr; 1285 struct ip_options_rcu *inet_opt; 1286 int err; 1287 1288 inet_opt = rcu_dereference_protected(inet->inet_opt, 1289 lockdep_sock_is_held(sk)); 1290 if (inet_opt && inet_opt->opt.srr) 1291 daddr = inet_opt->opt.faddr; 1292 1293 /* Query new route. */ 1294 fl4 = &inet->cork.fl.u.ip4; 1295 rt = ip_route_connect(fl4, daddr, 0, sk->sk_bound_dev_if, 1296 sk->sk_protocol, inet->inet_sport, 1297 inet->inet_dport, sk); 1298 if (IS_ERR(rt)) 1299 return PTR_ERR(rt); 1300 1301 new_saddr = fl4->saddr; 1302 1303 if (new_saddr == old_saddr) { 1304 sk_setup_caps(sk, &rt->dst); 1305 return 0; 1306 } 1307 1308 err = inet_bhash2_update_saddr(sk, &new_saddr, AF_INET); 1309 if (err) { 1310 ip_rt_put(rt); 1311 return err; 1312 } 1313 1314 sk_setup_caps(sk, &rt->dst); 1315 1316 if (READ_ONCE(sock_net(sk)->ipv4.sysctl_ip_dynaddr) > 1) { 1317 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n", 1318 __func__, &old_saddr, &new_saddr); 1319 } 1320 1321 /* 1322 * XXX The only one ugly spot where we need to 1323 * XXX really change the sockets identity after 1324 * XXX it has entered the hashes. -DaveM 1325 * 1326 * Besides that, it does not check for connection 1327 * uniqueness. Wait for troubles. 1328 */ 1329 return __sk_prot_rehash(sk); 1330 } 1331 1332 int inet_sk_rebuild_header(struct sock *sk) 1333 { 1334 struct rtable *rt = dst_rtable(__sk_dst_check(sk, 0)); 1335 struct inet_sock *inet = inet_sk(sk); 1336 struct flowi4 *fl4; 1337 int err; 1338 1339 /* Route is OK, nothing to do. */ 1340 if (rt) 1341 return 0; 1342 1343 /* Reroute. */ 1344 fl4 = &inet->cork.fl.u.ip4; 1345 inet_sk_init_flowi4(inet, fl4); 1346 rt = ip_route_output_flow(sock_net(sk), fl4, sk); 1347 if (!IS_ERR(rt)) { 1348 err = 0; 1349 sk_setup_caps(sk, &rt->dst); 1350 } else { 1351 err = PTR_ERR(rt); 1352 1353 /* Routing failed... */ 1354 sk->sk_route_caps = 0; 1355 1356 if (!READ_ONCE(sock_net(sk)->ipv4.sysctl_ip_dynaddr) || 1357 sk->sk_state != TCP_SYN_SENT || 1358 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 1359 (err = inet_sk_reselect_saddr(sk)) != 0) 1360 WRITE_ONCE(sk->sk_err_soft, -err); 1361 } 1362 1363 return err; 1364 } 1365 EXPORT_SYMBOL(inet_sk_rebuild_header); 1366 1367 void inet_sk_set_state(struct sock *sk, int state) 1368 { 1369 trace_inet_sock_set_state(sk, sk->sk_state, state); 1370 sk->sk_state = state; 1371 } 1372 EXPORT_SYMBOL(inet_sk_set_state); 1373 1374 void inet_sk_state_store(struct sock *sk, int newstate) 1375 { 1376 trace_inet_sock_set_state(sk, sk->sk_state, newstate); 1377 smp_store_release(&sk->sk_state, newstate); 1378 } 1379 1380 struct sk_buff *inet_gso_segment(struct sk_buff *skb, 1381 netdev_features_t features) 1382 { 1383 bool udpfrag = false, fixedid = false, gso_partial, encap; 1384 struct sk_buff *segs = ERR_PTR(-EINVAL); 1385 const struct net_offload *ops; 1386 unsigned int offset = 0; 1387 struct iphdr *iph; 1388 int proto, tot_len; 1389 int nhoff; 1390 int ihl; 1391 int id; 1392 1393 skb_reset_network_header(skb); 1394 nhoff = skb_network_header(skb) - skb_mac_header(skb); 1395 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1396 goto out; 1397 1398 iph = ip_hdr(skb); 1399 ihl = iph->ihl * 4; 1400 if (ihl < sizeof(*iph)) 1401 goto out; 1402 1403 id = ntohs(iph->id); 1404 proto = iph->protocol; 1405 1406 /* Warning: after this point, iph might be no longer valid */ 1407 if (unlikely(!pskb_may_pull(skb, ihl))) 1408 goto out; 1409 __skb_pull(skb, ihl); 1410 1411 encap = SKB_GSO_CB(skb)->encap_level > 0; 1412 if (encap) 1413 features &= skb->dev->hw_enc_features; 1414 SKB_GSO_CB(skb)->encap_level += ihl; 1415 1416 skb_reset_transport_header(skb); 1417 1418 segs = ERR_PTR(-EPROTONOSUPPORT); 1419 1420 fixedid = !!(skb_shinfo(skb)->gso_type & (SKB_GSO_TCP_FIXEDID << encap)); 1421 1422 if (!skb->encapsulation || encap) 1423 udpfrag = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP); 1424 1425 ops = rcu_dereference(inet_offloads[proto]); 1426 if (likely(ops && ops->callbacks.gso_segment)) { 1427 segs = ops->callbacks.gso_segment(skb, features); 1428 if (!segs) 1429 skb->network_header = skb_mac_header(skb) + nhoff - skb->head; 1430 } 1431 1432 if (IS_ERR_OR_NULL(segs)) 1433 goto out; 1434 1435 gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL); 1436 1437 skb = segs; 1438 do { 1439 iph = (struct iphdr *)(skb_mac_header(skb) + nhoff); 1440 if (udpfrag) { 1441 iph->frag_off = htons(offset >> 3); 1442 if (skb->next) 1443 iph->frag_off |= htons(IP_MF); 1444 offset += skb->len - nhoff - ihl; 1445 tot_len = skb->len - nhoff; 1446 } else if (skb_is_gso(skb)) { 1447 if (!fixedid) { 1448 iph->id = htons(id); 1449 id += skb_shinfo(skb)->gso_segs; 1450 } 1451 1452 if (gso_partial) 1453 tot_len = skb_shinfo(skb)->gso_size + 1454 SKB_GSO_CB(skb)->data_offset + 1455 skb->head - (unsigned char *)iph; 1456 else 1457 tot_len = skb->len - nhoff; 1458 } else { 1459 if (!fixedid) 1460 iph->id = htons(id++); 1461 tot_len = skb->len - nhoff; 1462 } 1463 iph->tot_len = htons(tot_len); 1464 ip_send_check(iph); 1465 if (encap) 1466 skb_reset_inner_headers(skb); 1467 skb->network_header = (u8 *)iph - skb->head; 1468 skb_reset_mac_len(skb); 1469 } while ((skb = skb->next)); 1470 1471 out: 1472 return segs; 1473 } 1474 1475 static struct sk_buff *ipip_gso_segment(struct sk_buff *skb, 1476 netdev_features_t features) 1477 { 1478 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_IPXIP4)) 1479 return ERR_PTR(-EINVAL); 1480 1481 return inet_gso_segment(skb, features); 1482 } 1483 1484 struct sk_buff *inet_gro_receive(struct list_head *head, struct sk_buff *skb) 1485 { 1486 const struct net_offload *ops; 1487 struct sk_buff *pp = NULL; 1488 const struct iphdr *iph; 1489 struct sk_buff *p; 1490 unsigned int hlen; 1491 unsigned int off; 1492 int flush = 1; 1493 int proto; 1494 1495 off = skb_gro_offset(skb); 1496 hlen = off + sizeof(*iph); 1497 iph = skb_gro_header(skb, hlen, off); 1498 if (unlikely(!iph)) 1499 goto out; 1500 1501 proto = iph->protocol; 1502 1503 ops = rcu_dereference(inet_offloads[proto]); 1504 if (!ops || !ops->callbacks.gro_receive) 1505 goto out; 1506 1507 if (*(u8 *)iph != 0x45) 1508 goto out; 1509 1510 if (ip_is_fragment(iph)) 1511 goto out; 1512 1513 if (unlikely(ip_fast_csum((u8 *)iph, 5))) 1514 goto out; 1515 1516 NAPI_GRO_CB(skb)->proto = proto; 1517 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (ntohl(*(__be32 *)&iph->id) & ~IP_DF)); 1518 1519 list_for_each_entry(p, head, list) { 1520 struct iphdr *iph2; 1521 1522 if (!NAPI_GRO_CB(p)->same_flow) 1523 continue; 1524 1525 iph2 = (struct iphdr *)(p->data + off); 1526 /* The above works because, with the exception of the top 1527 * (inner most) layer, we only aggregate pkts with the same 1528 * hdr length so all the hdrs we'll need to verify will start 1529 * at the same offset. 1530 */ 1531 if ((iph->protocol ^ iph2->protocol) | 1532 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) | 1533 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) { 1534 NAPI_GRO_CB(p)->same_flow = 0; 1535 continue; 1536 } 1537 } 1538 1539 NAPI_GRO_CB(skb)->flush |= flush; 1540 NAPI_GRO_CB(skb)->network_offsets[NAPI_GRO_CB(skb)->encap_mark] = off; 1541 1542 /* Note : No need to call skb_gro_postpull_rcsum() here, 1543 * as we already checked checksum over ipv4 header was 0 1544 */ 1545 skb_gro_pull(skb, sizeof(*iph)); 1546 skb_set_transport_header(skb, skb_gro_offset(skb)); 1547 1548 pp = indirect_call_gro_receive(tcp4_gro_receive, udp4_gro_receive, 1549 ops->callbacks.gro_receive, head, skb); 1550 1551 out: 1552 skb_gro_flush_final(skb, pp, flush); 1553 1554 return pp; 1555 } 1556 1557 static struct sk_buff *ipip_gro_receive(struct list_head *head, 1558 struct sk_buff *skb) 1559 { 1560 if (NAPI_GRO_CB(skb)->encap_mark) { 1561 NAPI_GRO_CB(skb)->flush = 1; 1562 return NULL; 1563 } 1564 1565 NAPI_GRO_CB(skb)->encap_mark = 1; 1566 1567 return inet_gro_receive(head, skb); 1568 } 1569 1570 #define SECONDS_PER_DAY 86400 1571 1572 /* inet_current_timestamp - Return IP network timestamp 1573 * 1574 * Return milliseconds since midnight in network byte order. 1575 */ 1576 __be32 inet_current_timestamp(void) 1577 { 1578 u32 secs; 1579 u32 msecs; 1580 struct timespec64 ts; 1581 1582 ktime_get_real_ts64(&ts); 1583 1584 /* Get secs since midnight. */ 1585 (void)div_u64_rem(ts.tv_sec, SECONDS_PER_DAY, &secs); 1586 /* Convert to msecs. */ 1587 msecs = secs * MSEC_PER_SEC; 1588 /* Convert nsec to msec. */ 1589 msecs += (u32)ts.tv_nsec / NSEC_PER_MSEC; 1590 1591 /* Convert to network byte order. */ 1592 return htonl(msecs); 1593 } 1594 EXPORT_SYMBOL(inet_current_timestamp); 1595 1596 int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 1597 { 1598 unsigned int family = READ_ONCE(sk->sk_family); 1599 1600 if (family == AF_INET) 1601 return ip_recv_error(sk, msg, len, addr_len); 1602 #if IS_ENABLED(CONFIG_IPV6) 1603 if (family == AF_INET6) 1604 return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len); 1605 #endif 1606 return -EINVAL; 1607 } 1608 EXPORT_SYMBOL(inet_recv_error); 1609 1610 int inet_gro_complete(struct sk_buff *skb, int nhoff) 1611 { 1612 struct iphdr *iph = (struct iphdr *)(skb->data + nhoff); 1613 const struct net_offload *ops; 1614 __be16 totlen = iph->tot_len; 1615 int proto = iph->protocol; 1616 int err = -ENOSYS; 1617 1618 if (skb->encapsulation) { 1619 skb_set_inner_protocol(skb, cpu_to_be16(ETH_P_IP)); 1620 skb_set_inner_network_header(skb, nhoff); 1621 } 1622 1623 iph_set_totlen(iph, skb->len - nhoff); 1624 csum_replace2(&iph->check, totlen, iph->tot_len); 1625 1626 ops = rcu_dereference(inet_offloads[proto]); 1627 if (WARN_ON(!ops || !ops->callbacks.gro_complete)) 1628 goto out; 1629 1630 /* Only need to add sizeof(*iph) to get to the next hdr below 1631 * because any hdr with option will have been flushed in 1632 * inet_gro_receive(). 1633 */ 1634 err = INDIRECT_CALL_2(ops->callbacks.gro_complete, 1635 tcp4_gro_complete, udp4_gro_complete, 1636 skb, nhoff + sizeof(*iph)); 1637 1638 out: 1639 return err; 1640 } 1641 1642 static int ipip_gro_complete(struct sk_buff *skb, int nhoff) 1643 { 1644 skb->encapsulation = 1; 1645 skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4; 1646 return inet_gro_complete(skb, nhoff); 1647 } 1648 1649 int inet_ctl_sock_create(struct sock **sk, unsigned short family, 1650 unsigned short type, unsigned char protocol, 1651 struct net *net) 1652 { 1653 struct socket *sock; 1654 int rc = sock_create_kern(net, family, type, protocol, &sock); 1655 1656 if (rc == 0) { 1657 *sk = sock->sk; 1658 (*sk)->sk_allocation = GFP_ATOMIC; 1659 (*sk)->sk_use_task_frag = false; 1660 /* 1661 * Unhash it so that IP input processing does not even see it, 1662 * we do not wish this socket to see incoming packets. 1663 */ 1664 (*sk)->sk_prot->unhash(*sk); 1665 } 1666 return rc; 1667 } 1668 EXPORT_SYMBOL_GPL(inet_ctl_sock_create); 1669 1670 unsigned long snmp_fold_field(void __percpu *mib, int offt) 1671 { 1672 unsigned long res = 0; 1673 int i; 1674 1675 for_each_possible_cpu(i) 1676 res += snmp_get_cpu_field(mib, i, offt); 1677 return res; 1678 } 1679 EXPORT_SYMBOL_GPL(snmp_fold_field); 1680 1681 #if BITS_PER_LONG==32 1682 1683 u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offt, 1684 size_t syncp_offset) 1685 { 1686 void *bhptr; 1687 struct u64_stats_sync *syncp; 1688 u64 v; 1689 unsigned int start; 1690 1691 bhptr = per_cpu_ptr(mib, cpu); 1692 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset); 1693 do { 1694 start = u64_stats_fetch_begin(syncp); 1695 v = *(((u64 *)bhptr) + offt); 1696 } while (u64_stats_fetch_retry(syncp, start)); 1697 1698 return v; 1699 } 1700 EXPORT_SYMBOL_GPL(snmp_get_cpu_field64); 1701 1702 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset) 1703 { 1704 u64 res = 0; 1705 int cpu; 1706 1707 for_each_possible_cpu(cpu) { 1708 res += snmp_get_cpu_field64(mib, cpu, offt, syncp_offset); 1709 } 1710 return res; 1711 } 1712 EXPORT_SYMBOL_GPL(snmp_fold_field64); 1713 #endif 1714 1715 #ifdef CONFIG_IP_MULTICAST 1716 static const struct net_protocol igmp_protocol = { 1717 .handler = igmp_rcv, 1718 }; 1719 #endif 1720 1721 static const struct net_protocol icmp_protocol = { 1722 .handler = icmp_rcv, 1723 .err_handler = icmp_err, 1724 .no_policy = 1, 1725 }; 1726 1727 static __net_init int ipv4_mib_init_net(struct net *net) 1728 { 1729 int i; 1730 1731 net->mib.tcp_statistics = alloc_percpu(struct tcp_mib); 1732 if (!net->mib.tcp_statistics) 1733 goto err_tcp_mib; 1734 net->mib.ip_statistics = alloc_percpu(struct ipstats_mib); 1735 if (!net->mib.ip_statistics) 1736 goto err_ip_mib; 1737 1738 for_each_possible_cpu(i) { 1739 struct ipstats_mib *af_inet_stats; 1740 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i); 1741 u64_stats_init(&af_inet_stats->syncp); 1742 } 1743 1744 net->mib.net_statistics = alloc_percpu(struct linux_mib); 1745 if (!net->mib.net_statistics) 1746 goto err_net_mib; 1747 net->mib.udp_statistics = alloc_percpu(struct udp_mib); 1748 if (!net->mib.udp_statistics) 1749 goto err_udp_mib; 1750 net->mib.udplite_statistics = alloc_percpu(struct udp_mib); 1751 if (!net->mib.udplite_statistics) 1752 goto err_udplite_mib; 1753 net->mib.icmp_statistics = alloc_percpu(struct icmp_mib); 1754 if (!net->mib.icmp_statistics) 1755 goto err_icmp_mib; 1756 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib), 1757 GFP_KERNEL); 1758 if (!net->mib.icmpmsg_statistics) 1759 goto err_icmpmsg_mib; 1760 1761 tcp_mib_init(net); 1762 return 0; 1763 1764 err_icmpmsg_mib: 1765 free_percpu(net->mib.icmp_statistics); 1766 err_icmp_mib: 1767 free_percpu(net->mib.udplite_statistics); 1768 err_udplite_mib: 1769 free_percpu(net->mib.udp_statistics); 1770 err_udp_mib: 1771 free_percpu(net->mib.net_statistics); 1772 err_net_mib: 1773 free_percpu(net->mib.ip_statistics); 1774 err_ip_mib: 1775 free_percpu(net->mib.tcp_statistics); 1776 err_tcp_mib: 1777 return -ENOMEM; 1778 } 1779 1780 static __net_exit void ipv4_mib_exit_net(struct net *net) 1781 { 1782 kfree(net->mib.icmpmsg_statistics); 1783 free_percpu(net->mib.icmp_statistics); 1784 free_percpu(net->mib.udplite_statistics); 1785 free_percpu(net->mib.udp_statistics); 1786 free_percpu(net->mib.net_statistics); 1787 free_percpu(net->mib.ip_statistics); 1788 free_percpu(net->mib.tcp_statistics); 1789 #ifdef CONFIG_MPTCP 1790 /* allocated on demand, see mptcp_init_sock() */ 1791 free_percpu(net->mib.mptcp_statistics); 1792 #endif 1793 } 1794 1795 static __net_initdata struct pernet_operations ipv4_mib_ops = { 1796 .init = ipv4_mib_init_net, 1797 .exit = ipv4_mib_exit_net, 1798 }; 1799 1800 static int __init init_ipv4_mibs(void) 1801 { 1802 return register_pernet_subsys(&ipv4_mib_ops); 1803 } 1804 1805 static __net_init int inet_init_net(struct net *net) 1806 { 1807 /* 1808 * Set defaults for local port range 1809 */ 1810 net->ipv4.ip_local_ports.range = 60999u << 16 | 32768u; 1811 1812 seqlock_init(&net->ipv4.ping_group_range.lock); 1813 /* 1814 * Sane defaults - nobody may create ping sockets. 1815 * Boot scripts should set this to distro-specific group. 1816 */ 1817 net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1); 1818 net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0); 1819 1820 /* Default values for sysctl-controlled parameters. 1821 * We set them here, in case sysctl is not compiled. 1822 */ 1823 net->ipv4.sysctl_ip_default_ttl = IPDEFTTL; 1824 net->ipv4.sysctl_ip_fwd_update_priority = 1; 1825 net->ipv4.sysctl_ip_dynaddr = 0; 1826 net->ipv4.sysctl_ip_early_demux = 1; 1827 net->ipv4.sysctl_udp_early_demux = 1; 1828 net->ipv4.sysctl_tcp_early_demux = 1; 1829 net->ipv4.sysctl_nexthop_compat_mode = 1; 1830 #ifdef CONFIG_SYSCTL 1831 net->ipv4.sysctl_ip_prot_sock = PROT_SOCK; 1832 #endif 1833 1834 /* Some igmp sysctl, whose values are always used */ 1835 net->ipv4.sysctl_igmp_max_memberships = 20; 1836 net->ipv4.sysctl_igmp_max_msf = 10; 1837 /* IGMP reports for link-local multicast groups are enabled by default */ 1838 net->ipv4.sysctl_igmp_llm_reports = 1; 1839 net->ipv4.sysctl_igmp_qrv = 2; 1840 1841 net->ipv4.sysctl_fib_notify_on_flag_change = 0; 1842 1843 return 0; 1844 } 1845 1846 static __net_initdata struct pernet_operations af_inet_ops = { 1847 .init = inet_init_net, 1848 }; 1849 1850 static int __init init_inet_pernet_ops(void) 1851 { 1852 return register_pernet_subsys(&af_inet_ops); 1853 } 1854 1855 static int ipv4_proc_init(void); 1856 1857 /* 1858 * IP protocol layer initialiser 1859 */ 1860 1861 1862 static const struct net_offload ipip_offload = { 1863 .callbacks = { 1864 .gso_segment = ipip_gso_segment, 1865 .gro_receive = ipip_gro_receive, 1866 .gro_complete = ipip_gro_complete, 1867 }, 1868 }; 1869 1870 static int __init ipip_offload_init(void) 1871 { 1872 return inet_add_offload(&ipip_offload, IPPROTO_IPIP); 1873 } 1874 1875 static int __init ipv4_offload_init(void) 1876 { 1877 /* 1878 * Add offloads 1879 */ 1880 if (udpv4_offload_init() < 0) 1881 pr_crit("%s: Cannot add UDP protocol offload\n", __func__); 1882 if (tcpv4_offload_init() < 0) 1883 pr_crit("%s: Cannot add TCP protocol offload\n", __func__); 1884 if (ipip_offload_init() < 0) 1885 pr_crit("%s: Cannot add IPIP protocol offload\n", __func__); 1886 1887 net_hotdata.ip_packet_offload = (struct packet_offload) { 1888 .type = cpu_to_be16(ETH_P_IP), 1889 .callbacks = { 1890 .gso_segment = inet_gso_segment, 1891 .gro_receive = inet_gro_receive, 1892 .gro_complete = inet_gro_complete, 1893 }, 1894 }; 1895 dev_add_offload(&net_hotdata.ip_packet_offload); 1896 return 0; 1897 } 1898 1899 fs_initcall(ipv4_offload_init); 1900 1901 static struct packet_type ip_packet_type __read_mostly = { 1902 .type = cpu_to_be16(ETH_P_IP), 1903 .func = ip_rcv, 1904 .list_func = ip_list_rcv, 1905 }; 1906 1907 static int __init inet_init(void) 1908 { 1909 struct inet_protosw *q; 1910 struct list_head *r; 1911 int rc; 1912 1913 sock_skb_cb_check_size(sizeof(struct inet_skb_parm)); 1914 1915 raw_hashinfo_init(&raw_v4_hashinfo); 1916 1917 rc = proto_register(&tcp_prot, 1); 1918 if (rc) 1919 goto out; 1920 1921 rc = proto_register(&udp_prot, 1); 1922 if (rc) 1923 goto out_unregister_tcp_proto; 1924 1925 rc = proto_register(&raw_prot, 1); 1926 if (rc) 1927 goto out_unregister_udp_proto; 1928 1929 rc = proto_register(&ping_prot, 1); 1930 if (rc) 1931 goto out_unregister_raw_proto; 1932 1933 /* 1934 * Tell SOCKET that we are alive... 1935 */ 1936 1937 (void)sock_register(&inet_family_ops); 1938 1939 #ifdef CONFIG_SYSCTL 1940 ip_static_sysctl_init(); 1941 #endif 1942 1943 /* 1944 * Add all the base protocols. 1945 */ 1946 1947 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 1948 pr_crit("%s: Cannot add ICMP protocol\n", __func__); 1949 1950 net_hotdata.udp_protocol = (struct net_protocol) { 1951 .handler = udp_rcv, 1952 .err_handler = udp_err, 1953 .no_policy = 1, 1954 }; 1955 if (inet_add_protocol(&net_hotdata.udp_protocol, IPPROTO_UDP) < 0) 1956 pr_crit("%s: Cannot add UDP protocol\n", __func__); 1957 1958 net_hotdata.tcp_protocol = (struct net_protocol) { 1959 .handler = tcp_v4_rcv, 1960 .err_handler = tcp_v4_err, 1961 .no_policy = 1, 1962 .icmp_strict_tag_validation = 1, 1963 }; 1964 if (inet_add_protocol(&net_hotdata.tcp_protocol, IPPROTO_TCP) < 0) 1965 pr_crit("%s: Cannot add TCP protocol\n", __func__); 1966 #ifdef CONFIG_IP_MULTICAST 1967 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 1968 pr_crit("%s: Cannot add IGMP protocol\n", __func__); 1969 #endif 1970 1971 /* Register the socket-side information for inet_create. */ 1972 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 1973 INIT_LIST_HEAD(r); 1974 1975 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 1976 inet_register_protosw(q); 1977 1978 /* 1979 * Set the ARP module up 1980 */ 1981 1982 arp_init(); 1983 1984 /* 1985 * Set the IP module up 1986 */ 1987 1988 ip_init(); 1989 1990 /* Initialise per-cpu ipv4 mibs */ 1991 if (init_ipv4_mibs()) 1992 panic("%s: Cannot init ipv4 mibs\n", __func__); 1993 1994 /* Setup TCP slab cache for open requests. */ 1995 tcp_init(); 1996 1997 /* Setup UDP memory threshold */ 1998 udp_init(); 1999 2000 /* Add UDP-Lite (RFC 3828) */ 2001 udplite4_register(); 2002 2003 raw_init(); 2004 2005 ping_init(); 2006 2007 /* 2008 * Set the ICMP layer up 2009 */ 2010 2011 if (icmp_init() < 0) 2012 panic("Failed to create the ICMP control socket.\n"); 2013 2014 /* 2015 * Initialise the multicast router 2016 */ 2017 #if defined(CONFIG_IP_MROUTE) 2018 if (ip_mr_init()) 2019 pr_crit("%s: Cannot init ipv4 mroute\n", __func__); 2020 #endif 2021 2022 if (init_inet_pernet_ops()) 2023 pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__); 2024 2025 ipv4_proc_init(); 2026 2027 ipfrag_init(); 2028 2029 dev_add_pack(&ip_packet_type); 2030 2031 ip_tunnel_core_init(); 2032 2033 rc = 0; 2034 out: 2035 return rc; 2036 out_unregister_raw_proto: 2037 proto_unregister(&raw_prot); 2038 out_unregister_udp_proto: 2039 proto_unregister(&udp_prot); 2040 out_unregister_tcp_proto: 2041 proto_unregister(&tcp_prot); 2042 goto out; 2043 } 2044 2045 fs_initcall(inet_init); 2046 2047 /* ------------------------------------------------------------------------ */ 2048 2049 #ifdef CONFIG_PROC_FS 2050 static int __init ipv4_proc_init(void) 2051 { 2052 int rc = 0; 2053 2054 if (raw_proc_init()) 2055 goto out_raw; 2056 if (tcp4_proc_init()) 2057 goto out_tcp; 2058 if (udp4_proc_init()) 2059 goto out_udp; 2060 if (ping_proc_init()) 2061 goto out_ping; 2062 if (ip_misc_proc_init()) 2063 goto out_misc; 2064 out: 2065 return rc; 2066 out_misc: 2067 ping_proc_exit(); 2068 out_ping: 2069 udp4_proc_exit(); 2070 out_udp: 2071 tcp4_proc_exit(); 2072 out_tcp: 2073 raw_proc_exit(); 2074 out_raw: 2075 rc = -ENOMEM; 2076 goto out; 2077 } 2078 2079 #else /* CONFIG_PROC_FS */ 2080 static int __init ipv4_proc_init(void) 2081 { 2082 return 0; 2083 } 2084 #endif /* CONFIG_PROC_FS */ 2085