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/ping.h> 108 #include <linux/skbuff.h> 109 #include <net/sock.h> 110 #include <net/raw.h> 111 #include <net/icmp.h> 112 #include <net/inet_common.h> 113 #include <net/ip_tunnels.h> 114 #include <net/xfrm.h> 115 #include <net/net_namespace.h> 116 #include <net/secure_seq.h> 117 #ifdef CONFIG_IP_MROUTE 118 #include <linux/mroute.h> 119 #endif 120 #include <net/l3mdev.h> 121 #include <net/compat.h> 122 #include <net/rps.h> 123 124 #include <trace/events/sock.h> 125 126 /* Keep the definition of IPv6 disable here for now, to avoid annoying linker 127 * issues in case IPv6=m 128 */ 129 int disable_ipv6_mod; 130 EXPORT_SYMBOL(disable_ipv6_mod); 131 132 /* The inetsw table contains everything that inet_create needs to 133 * build a new socket. 134 */ 135 static struct list_head inetsw[SOCK_MAX]; 136 static DEFINE_SPINLOCK(inetsw_lock); 137 138 /* New destruction routine */ 139 140 void inet_sock_destruct(struct sock *sk) 141 { 142 struct inet_sock *inet = inet_sk(sk); 143 144 __skb_queue_purge(&sk->sk_receive_queue); 145 __skb_queue_purge(&sk->sk_error_queue); 146 147 sk_mem_reclaim_final(sk); 148 149 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) { 150 pr_err("Attempt to release TCP socket in state %d %p\n", 151 sk->sk_state, sk); 152 return; 153 } 154 if (!sock_flag(sk, SOCK_DEAD)) { 155 pr_err("Attempt to release alive inet socket %p\n", sk); 156 return; 157 } 158 159 WARN_ON_ONCE(atomic_read(&sk->sk_rmem_alloc)); 160 WARN_ON_ONCE(refcount_read(&sk->sk_wmem_alloc)); 161 WARN_ON_ONCE(sk->sk_wmem_queued); 162 WARN_ON_ONCE(sk->sk_forward_alloc); 163 164 kfree(rcu_dereference_protected(inet->inet_opt, 1)); 165 dst_release(rcu_dereference_protected(sk->sk_dst_cache, 1)); 166 dst_release(rcu_dereference_protected(sk->sk_rx_dst, 1)); 167 psp_sk_assoc_free(sk); 168 } 169 EXPORT_SYMBOL(inet_sock_destruct); 170 171 /* 172 * The routines beyond this point handle the behaviour of an AF_INET 173 * socket object. Mostly it punts to the subprotocols of IP to do 174 * the work. 175 */ 176 177 /* 178 * Automatically bind an unbound socket. 179 */ 180 181 static int inet_autobind(struct sock *sk) 182 { 183 struct inet_sock *inet; 184 /* We may need to bind the socket. */ 185 lock_sock(sk); 186 inet = inet_sk(sk); 187 if (!inet->inet_num) { 188 if (sk->sk_prot->get_port(sk, 0)) { 189 release_sock(sk); 190 return -EAGAIN; 191 } 192 inet->inet_sport = htons(inet->inet_num); 193 } 194 release_sock(sk); 195 return 0; 196 } 197 198 int __inet_listen_sk(struct sock *sk, int backlog) 199 { 200 unsigned char old_state = sk->sk_state; 201 int err, tcp_fastopen; 202 203 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN))) 204 return -EINVAL; 205 206 WRITE_ONCE(sk->sk_max_ack_backlog, backlog); 207 /* Really, if the socket is already in listen state 208 * we can only allow the backlog to be adjusted. 209 */ 210 if (old_state != TCP_LISTEN) { 211 /* Enable TFO w/o requiring TCP_FASTOPEN socket option. 212 * Note that only TCP sockets (SOCK_STREAM) will reach here. 213 * Also fastopen backlog may already been set via the option 214 * because the socket was in TCP_LISTEN state previously but 215 * was shutdown() rather than close(). 216 */ 217 tcp_fastopen = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_fastopen); 218 if ((tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) && 219 (tcp_fastopen & TFO_SERVER_ENABLE) && 220 !inet_csk(sk)->icsk_accept_queue.fastopenq.max_qlen) { 221 fastopen_queue_tune(sk, backlog); 222 tcp_fastopen_init_key_once(sock_net(sk)); 223 } 224 225 err = inet_csk_listen_start(sk); 226 if (err) 227 return err; 228 229 tcp_call_bpf(sk, BPF_SOCK_OPS_TCP_LISTEN_CB); 230 bpf_tcp_ops_call(listen, sk); 231 } 232 return 0; 233 } 234 235 /* 236 * Move a socket into listening state. 237 */ 238 int inet_listen(struct socket *sock, int backlog) 239 { 240 struct sock *sk = sock->sk; 241 int err = -EINVAL; 242 243 lock_sock(sk); 244 245 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM) 246 goto out; 247 248 err = __inet_listen_sk(sk, backlog); 249 250 out: 251 release_sock(sk); 252 return err; 253 } 254 EXPORT_SYMBOL(inet_listen); 255 256 /* 257 * Create an inet socket. 258 */ 259 260 static int inet_create(struct net *net, struct socket *sock, int protocol, 261 int kern) 262 { 263 struct sock *sk; 264 struct inet_protosw *answer; 265 struct inet_sock *inet; 266 struct proto *answer_prot; 267 unsigned char answer_flags; 268 int try_loading_module = 0; 269 int err; 270 271 if (protocol < 0 || protocol >= IPPROTO_MAX) 272 return -EINVAL; 273 274 sock->state = SS_UNCONNECTED; 275 276 /* Look for the requested type/protocol pair. */ 277 lookup_protocol: 278 err = -ESOCKTNOSUPPORT; 279 rcu_read_lock(); 280 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) { 281 282 err = 0; 283 /* Check the non-wild match. */ 284 if (protocol == answer->protocol) { 285 if (protocol != IPPROTO_IP) 286 break; 287 } else { 288 /* Check for the two wild cases. */ 289 if (IPPROTO_IP == protocol) { 290 protocol = answer->protocol; 291 break; 292 } 293 if (IPPROTO_IP == answer->protocol) 294 break; 295 } 296 err = -EPROTONOSUPPORT; 297 } 298 299 if (unlikely(err)) { 300 if (try_loading_module < 2) { 301 rcu_read_unlock(); 302 /* 303 * Be more specific, e.g. net-pf-2-proto-132-type-1 304 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) 305 */ 306 if (++try_loading_module == 1) 307 request_module("net-pf-%d-proto-%d-type-%d", 308 PF_INET, protocol, sock->type); 309 /* 310 * Fall back to generic, e.g. net-pf-2-proto-132 311 * (net-pf-PF_INET-proto-IPPROTO_SCTP) 312 */ 313 else 314 request_module("net-pf-%d-proto-%d", 315 PF_INET, protocol); 316 goto lookup_protocol; 317 } else 318 goto out_rcu_unlock; 319 } 320 321 err = -EPERM; 322 if (sock->type == SOCK_RAW && !kern && 323 !ns_capable(net->user_ns, CAP_NET_RAW)) 324 goto out_rcu_unlock; 325 326 sock->ops = answer->ops; 327 answer_prot = answer->prot; 328 answer_flags = answer->flags; 329 rcu_read_unlock(); 330 331 WARN_ON(!answer_prot->slab); 332 333 err = -ENOMEM; 334 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot, kern); 335 if (!sk) 336 goto out; 337 338 err = 0; 339 if (INET_PROTOSW_REUSE & answer_flags) 340 sk->sk_reuse = SK_CAN_REUSE; 341 342 if (INET_PROTOSW_ICSK & answer_flags) 343 inet_init_csk_locks(sk); 344 345 inet = inet_sk(sk); 346 inet_assign_bit(IS_ICSK, sk, INET_PROTOSW_ICSK & answer_flags); 347 348 inet_clear_bit(NODEFRAG, sk); 349 350 if (SOCK_RAW == sock->type) { 351 inet->inet_num = protocol; 352 if (IPPROTO_RAW == protocol) 353 inet_set_bit(HDRINCL, sk); 354 } 355 356 if (READ_ONCE(net->ipv4.sysctl_ip_no_pmtu_disc)) 357 inet->pmtudisc = IP_PMTUDISC_DONT; 358 else 359 inet->pmtudisc = IP_PMTUDISC_WANT; 360 361 atomic_set(&inet->inet_id, 0); 362 363 sock_init_data(sock, sk); 364 365 sk->sk_destruct = inet_sock_destruct; 366 sk->sk_protocol = protocol; 367 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 368 sk->sk_txrehash = READ_ONCE(net->core.sysctl_txrehash); 369 370 inet->uc_ttl = -1; 371 inet_set_bit(MC_LOOP, sk); 372 inet->mc_ttl = 1; 373 inet_set_bit(MC_ALL, sk); 374 inet->mc_index = 0; 375 inet->mc_list = NULL; 376 inet->rcv_tos = 0; 377 378 if (inet->inet_num) { 379 /* It assumes that any protocol which allows 380 * the user to assign a number at socket 381 * creation time automatically 382 * shares. 383 */ 384 inet->inet_sport = htons(inet->inet_num); 385 /* Add to protocol hash chains. */ 386 err = sk->sk_prot->hash(sk); 387 if (err) 388 goto out_sk_release; 389 } 390 391 if (sk->sk_prot->init) { 392 err = sk->sk_prot->init(sk); 393 if (err) 394 goto out_sk_release; 395 } 396 397 if (!kern) { 398 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk); 399 if (err) 400 goto out_sk_release; 401 } 402 out: 403 return err; 404 out_rcu_unlock: 405 rcu_read_unlock(); 406 goto out; 407 out_sk_release: 408 sk_common_release(sk); 409 sock->sk = NULL; 410 goto out; 411 } 412 413 414 /* 415 * The peer socket should always be NULL (or else). When we call this 416 * function we are destroying the object and from then on nobody 417 * should refer to it. 418 */ 419 int inet_release(struct socket *sock) 420 { 421 struct sock *sk = sock->sk; 422 423 if (sk) { 424 long timeout; 425 426 if (!sk->sk_kern_sock) 427 BPF_CGROUP_RUN_PROG_INET_SOCK_RELEASE(sk); 428 429 /* Applications forget to leave groups before exiting */ 430 ip_mc_drop_socket(sk); 431 432 /* If linger is set, we don't return until the close 433 * is complete. Otherwise we return immediately. The 434 * actually closing is done the same either way. 435 * 436 * If the close is due to the process exiting, we never 437 * linger.. 438 */ 439 timeout = 0; 440 if (sock_flag(sk, SOCK_LINGER) && 441 !(current->flags & PF_EXITING)) 442 timeout = sk->sk_lingertime; 443 sk->sk_prot->close(sk, timeout); 444 sock->sk = NULL; 445 } 446 return 0; 447 } 448 EXPORT_SYMBOL(inet_release); 449 450 int inet_bind_sk(struct sock *sk, struct sockaddr_unsized *uaddr, int addr_len) 451 { 452 u32 flags = BIND_WITH_LOCK; 453 int err; 454 455 /* If the socket has its own bind function then use it. (RAW) */ 456 if (sk->sk_prot->bind) { 457 return sk->sk_prot->bind(sk, uaddr, addr_len); 458 } 459 if (addr_len < sizeof(struct sockaddr_in)) 460 return -EINVAL; 461 462 /* BPF prog is run before any checks are done so that if the prog 463 * changes context in a wrong way it will be caught. 464 */ 465 err = BPF_CGROUP_RUN_PROG_INET_BIND_LOCK(sk, uaddr, &addr_len, 466 CGROUP_INET4_BIND, &flags); 467 if (err) 468 return err; 469 470 return __inet_bind(sk, uaddr, addr_len, flags); 471 } 472 473 int inet_bind(struct socket *sock, struct sockaddr_unsized *uaddr, int addr_len) 474 { 475 return inet_bind_sk(sock->sk, uaddr, addr_len); 476 } 477 EXPORT_SYMBOL(inet_bind); 478 479 int __inet_bind(struct sock *sk, struct sockaddr_unsized *uaddr, int addr_len, 480 u32 flags) 481 { 482 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 483 struct inet_sock *inet = inet_sk(sk); 484 struct net *net = sock_net(sk); 485 unsigned short snum; 486 int chk_addr_ret; 487 u32 tb_id = RT_TABLE_LOCAL; 488 int err; 489 490 if (addr->sin_family != AF_INET) { 491 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET) 492 * only if s_addr is INADDR_ANY. 493 */ 494 err = -EAFNOSUPPORT; 495 if (addr->sin_family != AF_UNSPEC || 496 addr->sin_addr.s_addr != htonl(INADDR_ANY)) 497 goto out; 498 } 499 500 tb_id = l3mdev_fib_table_by_index(net, sk->sk_bound_dev_if) ? : tb_id; 501 chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id); 502 503 /* Not specified by any standard per-se, however it breaks too 504 * many applications when removed. It is unfortunate since 505 * allowing applications to make a non-local bind solves 506 * several problems with systems using dynamic addressing. 507 * (ie. your servers still start up even if your ISDN link 508 * is temporarily down) 509 */ 510 err = -EADDRNOTAVAIL; 511 if (!inet_addr_valid_or_nonlocal(net, inet, addr->sin_addr.s_addr, 512 chk_addr_ret)) 513 goto out; 514 515 snum = ntohs(addr->sin_port); 516 err = -EACCES; 517 if (!(flags & BIND_NO_CAP_NET_BIND_SERVICE) && 518 snum && inet_port_requires_bind_service(net, snum) && 519 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 520 goto out; 521 522 /* We keep a pair of addresses. rcv_saddr is the one 523 * used by hash lookups, and saddr is used for transmit. 524 * 525 * In the BSD API these are the same except where it 526 * would be illegal to use them (multicast/broadcast) in 527 * which case the sending device address is used. 528 */ 529 if (flags & BIND_WITH_LOCK) 530 lock_sock(sk); 531 532 /* Check these errors (active socket, double bind). */ 533 err = -EINVAL; 534 if (sk->sk_state != TCP_CLOSE || inet->inet_num) 535 goto out_release_sock; 536 537 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 538 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 539 inet->inet_saddr = 0; /* Use device */ 540 541 /* Make sure we are allowed to bind here. */ 542 if (snum || !(inet_test_bit(BIND_ADDRESS_NO_PORT, sk) || 543 (flags & BIND_FORCE_ADDRESS_NO_PORT))) { 544 err = sk->sk_prot->get_port(sk, snum); 545 if (err) { 546 inet->inet_saddr = inet->inet_rcv_saddr = 0; 547 goto out_release_sock; 548 } 549 if (!(flags & BIND_FROM_BPF)) { 550 err = BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk); 551 if (err) { 552 inet->inet_saddr = inet->inet_rcv_saddr = 0; 553 if (sk->sk_prot->put_port) 554 sk->sk_prot->put_port(sk); 555 goto out_release_sock; 556 } 557 } 558 } 559 560 if (inet->inet_rcv_saddr) 561 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 562 if (snum) 563 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 564 inet->inet_sport = htons(inet->inet_num); 565 inet->inet_daddr = 0; 566 inet->inet_dport = 0; 567 sk_dst_reset(sk); 568 err = 0; 569 out_release_sock: 570 if (flags & BIND_WITH_LOCK) 571 release_sock(sk); 572 out: 573 return err; 574 } 575 576 int inet_dgram_connect(struct socket *sock, struct sockaddr_unsized *uaddr, 577 int addr_len, int flags) 578 { 579 struct sock *sk = sock->sk; 580 const struct proto *prot; 581 int err; 582 583 if (addr_len < sizeof(uaddr->sa_family)) 584 return -EINVAL; 585 586 /* IPV6_ADDRFORM can change sk->sk_prot under us. */ 587 prot = READ_ONCE(sk->sk_prot); 588 589 if (uaddr->sa_family == AF_UNSPEC) 590 return prot->disconnect(sk, flags); 591 592 if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) { 593 err = prot->pre_connect(sk, uaddr, addr_len); 594 if (err) 595 return err; 596 } 597 598 if (data_race(!inet_sk(sk)->inet_num) && inet_autobind(sk)) 599 return -EAGAIN; 600 return prot->connect(sk, uaddr, addr_len); 601 } 602 EXPORT_SYMBOL(inet_dgram_connect); 603 604 static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias) 605 { 606 DEFINE_WAIT_FUNC(wait, woken_wake_function); 607 608 add_wait_queue(sk_sleep(sk), &wait); 609 sk->sk_write_pending += writebias; 610 611 /* Basic assumption: if someone sets sk->sk_err, he _must_ 612 * change state of the socket from TCP_SYN_*. 613 * Connect() does not allow to get error notifications 614 * without closing the socket. 615 */ 616 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 617 release_sock(sk); 618 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo); 619 lock_sock(sk); 620 if (signal_pending(current) || !timeo) 621 break; 622 } 623 remove_wait_queue(sk_sleep(sk), &wait); 624 sk->sk_write_pending -= writebias; 625 return timeo; 626 } 627 628 /* 629 * Connect to a remote host. There is regrettably still a little 630 * TCP 'magic' in here. 631 */ 632 int __inet_stream_connect(struct socket *sock, struct sockaddr_unsized *uaddr, 633 int addr_len, int flags, int is_sendmsg) 634 { 635 struct sock *sk = sock->sk; 636 int err; 637 long timeo; 638 639 /* 640 * uaddr can be NULL and addr_len can be 0 if: 641 * sk is a TCP fastopen active socket and 642 * TCP_FASTOPEN_CONNECT sockopt is set and 643 * we already have a valid cookie for this socket. 644 * In this case, user can call write() after connect(). 645 * write() will invoke tcp_sendmsg_fastopen() which calls 646 * __inet_stream_connect(). 647 */ 648 if (uaddr) { 649 if (addr_len < sizeof(uaddr->sa_family)) 650 return -EINVAL; 651 652 if (uaddr->sa_family == AF_UNSPEC) { 653 sk->sk_disconnects++; 654 err = sk->sk_prot->disconnect(sk, flags); 655 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 656 goto out; 657 } 658 } 659 660 switch (sock->state) { 661 default: 662 err = -EINVAL; 663 goto out; 664 case SS_CONNECTED: 665 err = -EISCONN; 666 goto out; 667 case SS_CONNECTING: 668 if (inet_test_bit(DEFER_CONNECT, sk)) 669 err = is_sendmsg ? -EINPROGRESS : -EISCONN; 670 else 671 err = -EALREADY; 672 /* Fall out of switch with err, set for this state */ 673 break; 674 case SS_UNCONNECTED: 675 err = -EISCONN; 676 if (sk->sk_state != TCP_CLOSE) 677 goto out; 678 679 if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) { 680 err = sk->sk_prot->pre_connect(sk, uaddr, addr_len); 681 if (err) 682 goto out; 683 } 684 685 err = sk->sk_prot->connect(sk, uaddr, addr_len); 686 if (err < 0) 687 goto out; 688 689 sock->state = SS_CONNECTING; 690 691 if (!err && inet_test_bit(DEFER_CONNECT, sk)) 692 goto out; 693 694 /* Just entered SS_CONNECTING state; the only 695 * difference is that return value in non-blocking 696 * case is EINPROGRESS, rather than EALREADY. 697 */ 698 err = -EINPROGRESS; 699 break; 700 } 701 702 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 703 704 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 705 int writebias = (sk->sk_protocol == IPPROTO_TCP) && 706 tcp_sk(sk)->fastopen_req && 707 tcp_sk(sk)->fastopen_req->data ? 1 : 0; 708 int dis = sk->sk_disconnects; 709 710 /* Error code is set above */ 711 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias)) 712 goto out; 713 714 err = sock_intr_errno(timeo); 715 if (signal_pending(current)) 716 goto out; 717 718 if (dis != sk->sk_disconnects) { 719 err = -EPIPE; 720 goto out; 721 } 722 } 723 724 /* Connection was closed by RST, timeout, ICMP error 725 * or another process disconnected us. 726 */ 727 if (sk->sk_state == TCP_CLOSE) 728 goto sock_error; 729 730 /* sk->sk_err may be not zero now, if RECVERR was ordered by user 731 * and error was received after socket entered established state. 732 * Hence, it is handled normally after connect() return successfully. 733 */ 734 735 sock->state = SS_CONNECTED; 736 err = 0; 737 out: 738 return err; 739 740 sock_error: 741 err = sock_error(sk) ? : -ECONNABORTED; 742 sock->state = SS_UNCONNECTED; 743 sk->sk_disconnects++; 744 if (sk->sk_prot->disconnect(sk, flags)) 745 sock->state = SS_DISCONNECTING; 746 goto out; 747 } 748 EXPORT_SYMBOL(__inet_stream_connect); 749 750 int inet_stream_connect(struct socket *sock, struct sockaddr_unsized *uaddr, 751 int addr_len, int flags) 752 { 753 int err; 754 755 lock_sock(sock->sk); 756 err = __inet_stream_connect(sock, uaddr, addr_len, flags, 0); 757 release_sock(sock->sk); 758 return err; 759 } 760 EXPORT_SYMBOL(inet_stream_connect); 761 762 void __inet_accept(struct socket *sock, struct socket *newsock, struct sock *newsk) 763 { 764 if (mem_cgroup_sockets_enabled) { 765 mem_cgroup_sk_alloc(newsk); 766 __sk_charge(newsk, GFP_KERNEL); 767 } 768 769 sock_rps_record_flow(newsk); 770 WARN_ON(!((1 << newsk->sk_state) & 771 (TCPF_ESTABLISHED | TCPF_SYN_RECV | 772 TCPF_FIN_WAIT1 | TCPF_FIN_WAIT2 | 773 TCPF_CLOSING | TCPF_CLOSE_WAIT | 774 TCPF_CLOSE))); 775 776 if (test_bit(SOCK_SUPPORT_ZC, &sock->flags)) 777 set_bit(SOCK_SUPPORT_ZC, &newsock->flags); 778 sock_graft(newsk, newsock); 779 780 newsock->state = SS_CONNECTED; 781 } 782 EXPORT_SYMBOL_GPL(__inet_accept); 783 784 /* 785 * Accept a pending connection. The TCP layer now gives BSD semantics. 786 */ 787 788 int inet_accept(struct socket *sock, struct socket *newsock, 789 struct proto_accept_arg *arg) 790 { 791 struct sock *sk1 = sock->sk, *sk2; 792 793 /* IPV6_ADDRFORM can change sk->sk_prot under us. */ 794 arg->err = -EINVAL; 795 sk2 = READ_ONCE(sk1->sk_prot)->accept(sk1, arg); 796 if (!sk2) 797 return arg->err; 798 799 lock_sock(sk2); 800 __inet_accept(sock, newsock, sk2); 801 release_sock(sk2); 802 return 0; 803 } 804 EXPORT_SYMBOL(inet_accept); 805 806 /* 807 * This does both peername and sockname. 808 */ 809 int inet_getname(struct socket *sock, struct sockaddr *uaddr, 810 int peer) 811 { 812 struct sock *sk = sock->sk; 813 struct inet_sock *inet = inet_sk(sk); 814 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr); 815 int sin_addr_len = sizeof(*sin); 816 817 sin->sin_family = AF_INET; 818 lock_sock(sk); 819 if (peer) { 820 if (!inet->inet_dport || 821 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 822 peer == 1)) { 823 release_sock(sk); 824 return -ENOTCONN; 825 } 826 sin->sin_port = inet->inet_dport; 827 sin->sin_addr.s_addr = inet->inet_daddr; 828 BPF_CGROUP_RUN_SA_PROG(sk, sin, &sin_addr_len, 829 CGROUP_INET4_GETPEERNAME); 830 } else { 831 __be32 addr = inet->inet_rcv_saddr; 832 if (!addr) 833 addr = inet->inet_saddr; 834 sin->sin_port = inet->inet_sport; 835 sin->sin_addr.s_addr = addr; 836 BPF_CGROUP_RUN_SA_PROG(sk, sin, &sin_addr_len, 837 CGROUP_INET4_GETSOCKNAME); 838 } 839 release_sock(sk); 840 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 841 return sin_addr_len; 842 } 843 EXPORT_SYMBOL(inet_getname); 844 845 int inet_send_prepare(struct sock *sk) 846 { 847 sock_rps_record_flow(sk); 848 849 /* We may need to bind the socket. */ 850 if (data_race(!inet_sk(sk)->inet_num) && !sk->sk_prot->no_autobind && 851 inet_autobind(sk)) 852 return -EAGAIN; 853 854 return 0; 855 } 856 857 int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) 858 { 859 struct sock *sk = sock->sk; 860 const struct proto *prot; 861 862 if (unlikely(inet_send_prepare(sk))) 863 return -EAGAIN; 864 865 prot = READ_ONCE(sk->sk_prot); 866 return INDIRECT_CALL_2(prot->sendmsg, tcp_sendmsg, udp_sendmsg, 867 sk, msg, size); 868 } 869 EXPORT_SYMBOL(inet_sendmsg); 870 871 void inet_splice_eof(struct socket *sock) 872 { 873 const struct proto *prot; 874 struct sock *sk = sock->sk; 875 876 if (unlikely(inet_send_prepare(sk))) 877 return; 878 879 /* IPV6_ADDRFORM can change sk->sk_prot under us. */ 880 prot = READ_ONCE(sk->sk_prot); 881 if (prot->splice_eof) 882 prot->splice_eof(sock); 883 } 884 885 int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 886 int flags) 887 { 888 struct sock *sk = sock->sk; 889 const struct proto *prot; 890 891 if (likely(!(flags & MSG_ERRQUEUE))) 892 sock_rps_record_flow(sk); 893 894 prot = READ_ONCE(sk->sk_prot); 895 return INDIRECT_CALL_2(prot->recvmsg, tcp_recvmsg, udp_recvmsg, 896 sk, msg, size, flags); 897 } 898 EXPORT_SYMBOL(inet_recvmsg); 899 900 int inet_shutdown(struct socket *sock, int how) 901 { 902 struct sock *sk = sock->sk; 903 int err = 0; 904 905 /* This should really check to make sure 906 * the socket is a TCP socket. (WHY AC...) 907 */ 908 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and 909 1->2 bit 2 snds. 910 2->3 */ 911 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ 912 return -EINVAL; 913 914 lock_sock(sk); 915 if (sock->state == SS_CONNECTING) { 916 if ((1 << sk->sk_state) & 917 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) 918 sock->state = SS_DISCONNECTING; 919 else 920 sock->state = SS_CONNECTED; 921 } 922 923 switch (sk->sk_state) { 924 case TCP_CLOSE: 925 err = -ENOTCONN; 926 /* Hack to wake up other listeners, who can poll for 927 EPOLLHUP, even on eg. unconnected UDP sockets -- RR */ 928 fallthrough; 929 default: 930 WRITE_ONCE(sk->sk_shutdown, sk->sk_shutdown | how); 931 if (sk->sk_prot->shutdown) 932 sk->sk_prot->shutdown(sk, how); 933 break; 934 935 /* Remaining two branches are temporary solution for missing 936 * close() in multithreaded environment. It is _not_ a good idea, 937 * but we have no choice until close() is repaired at VFS level. 938 */ 939 case TCP_LISTEN: 940 if (!(how & RCV_SHUTDOWN)) 941 break; 942 fallthrough; 943 case TCP_SYN_SENT: 944 err = sk->sk_prot->disconnect(sk, O_NONBLOCK); 945 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 946 break; 947 } 948 949 /* Wake up anyone sleeping in poll. */ 950 sk->sk_state_change(sk); 951 release_sock(sk); 952 return err; 953 } 954 EXPORT_SYMBOL(inet_shutdown); 955 956 /* 957 * ioctl() calls you can issue on an INET socket. Most of these are 958 * device configuration and stuff and very rarely used. Some ioctls 959 * pass on to the socket itself. 960 * 961 * NOTE: I like the idea of a module for the config stuff. ie ifconfig 962 * loads the devconfigure module does its configuring and unloads it. 963 * There's a good 20K of config code hanging around the kernel. 964 */ 965 966 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 967 { 968 struct sock *sk = sock->sk; 969 int err = 0; 970 struct net *net = sock_net(sk); 971 void __user *p = (void __user *)arg; 972 struct ifreq ifr; 973 struct rtentry rt; 974 975 switch (cmd) { 976 case SIOCADDRT: 977 case SIOCDELRT: 978 if (copy_from_user(&rt, p, sizeof(struct rtentry))) 979 return -EFAULT; 980 err = ip_rt_ioctl(net, cmd, &rt); 981 break; 982 case SIOCRTMSG: 983 err = -EINVAL; 984 break; 985 case SIOCDARP: 986 case SIOCGARP: 987 case SIOCSARP: 988 err = arp_ioctl(net, cmd, (void __user *)arg); 989 break; 990 case SIOCGIFADDR: 991 case SIOCGIFBRDADDR: 992 case SIOCGIFNETMASK: 993 case SIOCGIFDSTADDR: 994 case SIOCGIFPFLAGS: 995 if (get_user_ifreq(&ifr, NULL, p)) 996 return -EFAULT; 997 err = devinet_ioctl(net, cmd, &ifr); 998 if (!err && put_user_ifreq(&ifr, p)) 999 err = -EFAULT; 1000 break; 1001 1002 case SIOCSIFADDR: 1003 case SIOCSIFBRDADDR: 1004 case SIOCSIFNETMASK: 1005 case SIOCSIFDSTADDR: 1006 case SIOCSIFPFLAGS: 1007 case SIOCSIFFLAGS: 1008 if (get_user_ifreq(&ifr, NULL, p)) 1009 return -EFAULT; 1010 err = devinet_ioctl(net, cmd, &ifr); 1011 break; 1012 default: 1013 if (sk->sk_prot->ioctl) 1014 err = sk_ioctl(sk, cmd, (void __user *)arg); 1015 else 1016 err = -ENOIOCTLCMD; 1017 break; 1018 } 1019 return err; 1020 } 1021 EXPORT_SYMBOL(inet_ioctl); 1022 1023 #ifdef CONFIG_COMPAT 1024 static int inet_compat_routing_ioctl(struct sock *sk, unsigned int cmd, 1025 struct compat_rtentry __user *ur) 1026 { 1027 compat_uptr_t rtdev; 1028 struct rtentry rt; 1029 1030 if (copy_from_user(&rt.rt_dst, &ur->rt_dst, 1031 3 * sizeof(struct sockaddr)) || 1032 get_user(rt.rt_flags, &ur->rt_flags) || 1033 get_user(rt.rt_metric, &ur->rt_metric) || 1034 get_user(rt.rt_mtu, &ur->rt_mtu) || 1035 get_user(rt.rt_window, &ur->rt_window) || 1036 get_user(rt.rt_irtt, &ur->rt_irtt) || 1037 get_user(rtdev, &ur->rt_dev)) 1038 return -EFAULT; 1039 1040 rt.rt_dev = compat_ptr(rtdev); 1041 return ip_rt_ioctl(sock_net(sk), cmd, &rt); 1042 } 1043 1044 static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1045 { 1046 void __user *argp = compat_ptr(arg); 1047 struct sock *sk = sock->sk; 1048 1049 switch (cmd) { 1050 case SIOCADDRT: 1051 case SIOCDELRT: 1052 return inet_compat_routing_ioctl(sk, cmd, argp); 1053 default: 1054 if (!sk->sk_prot->compat_ioctl) 1055 return -ENOIOCTLCMD; 1056 return sk->sk_prot->compat_ioctl(sk, cmd, arg); 1057 } 1058 } 1059 #endif /* CONFIG_COMPAT */ 1060 1061 const struct proto_ops inet_stream_ops = { 1062 .family = PF_INET, 1063 .owner = THIS_MODULE, 1064 .release = inet_release, 1065 .bind = inet_bind, 1066 .connect = inet_stream_connect, 1067 .socketpair = sock_no_socketpair, 1068 .accept = inet_accept, 1069 .getname = inet_getname, 1070 .poll = tcp_poll, 1071 .ioctl = inet_ioctl, 1072 .gettstamp = sock_gettstamp, 1073 .listen = inet_listen, 1074 .shutdown = inet_shutdown, 1075 .setsockopt = sock_common_setsockopt, 1076 .getsockopt = sock_common_getsockopt, 1077 .sendmsg = inet_sendmsg, 1078 .recvmsg = inet_recvmsg, 1079 #ifdef CONFIG_MMU 1080 .mmap = tcp_mmap, 1081 #endif 1082 .splice_eof = inet_splice_eof, 1083 .splice_read = tcp_splice_read, 1084 .set_peek_off = sk_set_peek_off, 1085 .read_sock = tcp_read_sock, 1086 .read_skb = tcp_read_skb, 1087 .sendmsg_locked = tcp_sendmsg_locked, 1088 .peek_len = tcp_peek_len, 1089 #ifdef CONFIG_COMPAT 1090 .compat_ioctl = inet_compat_ioctl, 1091 #endif 1092 .set_rcvlowat = tcp_set_rcvlowat, 1093 .set_rcvbuf = tcp_set_rcvbuf, 1094 }; 1095 EXPORT_SYMBOL(inet_stream_ops); 1096 1097 const struct proto_ops inet_dgram_ops = { 1098 .family = PF_INET, 1099 .owner = THIS_MODULE, 1100 .release = inet_release, 1101 .bind = inet_bind, 1102 .connect = inet_dgram_connect, 1103 .socketpair = sock_no_socketpair, 1104 .accept = sock_no_accept, 1105 .getname = inet_getname, 1106 .poll = udp_poll, 1107 .ioctl = inet_ioctl, 1108 .gettstamp = sock_gettstamp, 1109 .listen = sock_no_listen, 1110 .shutdown = inet_shutdown, 1111 .setsockopt = sock_common_setsockopt, 1112 .getsockopt = sock_common_getsockopt, 1113 .sendmsg = inet_sendmsg, 1114 .read_skb = udp_read_skb, 1115 .recvmsg = inet_recvmsg, 1116 .mmap = sock_no_mmap, 1117 .splice_eof = inet_splice_eof, 1118 .set_peek_off = udp_set_peek_off, 1119 #ifdef CONFIG_COMPAT 1120 .compat_ioctl = inet_compat_ioctl, 1121 #endif 1122 }; 1123 EXPORT_SYMBOL(inet_dgram_ops); 1124 1125 /* 1126 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 1127 * udp_poll 1128 */ 1129 static const struct proto_ops inet_sockraw_ops = { 1130 .family = PF_INET, 1131 .owner = THIS_MODULE, 1132 .release = inet_release, 1133 .bind = inet_bind, 1134 .connect = inet_dgram_connect, 1135 .socketpair = sock_no_socketpair, 1136 .accept = sock_no_accept, 1137 .getname = inet_getname, 1138 .poll = datagram_poll, 1139 .ioctl = inet_ioctl, 1140 .gettstamp = sock_gettstamp, 1141 .listen = sock_no_listen, 1142 .shutdown = inet_shutdown, 1143 .setsockopt = sock_common_setsockopt, 1144 .getsockopt = sock_common_getsockopt, 1145 .sendmsg = inet_sendmsg, 1146 .recvmsg = inet_recvmsg, 1147 .mmap = sock_no_mmap, 1148 .splice_eof = inet_splice_eof, 1149 #ifdef CONFIG_COMPAT 1150 .compat_ioctl = inet_compat_ioctl, 1151 #endif 1152 }; 1153 1154 static const struct net_proto_family inet_family_ops = { 1155 .family = PF_INET, 1156 .create = inet_create, 1157 .owner = THIS_MODULE, 1158 }; 1159 1160 /* Upon startup we insert all the elements in inetsw_array[] into 1161 * the linked list inetsw. 1162 */ 1163 static struct inet_protosw inetsw_array[] = 1164 { 1165 { 1166 .type = SOCK_STREAM, 1167 .protocol = IPPROTO_TCP, 1168 .prot = &tcp_prot, 1169 .ops = &inet_stream_ops, 1170 .flags = INET_PROTOSW_PERMANENT | 1171 INET_PROTOSW_ICSK, 1172 }, 1173 1174 { 1175 .type = SOCK_DGRAM, 1176 .protocol = IPPROTO_UDP, 1177 .prot = &udp_prot, 1178 .ops = &inet_dgram_ops, 1179 .flags = INET_PROTOSW_PERMANENT, 1180 }, 1181 1182 { 1183 .type = SOCK_DGRAM, 1184 .protocol = IPPROTO_ICMP, 1185 .prot = &ping_prot, 1186 .ops = &inet_sockraw_ops, 1187 .flags = INET_PROTOSW_REUSE, 1188 }, 1189 1190 { 1191 .type = SOCK_RAW, 1192 .protocol = IPPROTO_IP, /* wild card */ 1193 .prot = &raw_prot, 1194 .ops = &inet_sockraw_ops, 1195 .flags = INET_PROTOSW_REUSE, 1196 } 1197 }; 1198 1199 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) 1200 1201 void inet_register_protosw(struct inet_protosw *p) 1202 { 1203 struct list_head *lh; 1204 struct inet_protosw *answer; 1205 int protocol = p->protocol; 1206 struct list_head *last_perm; 1207 1208 spin_lock_bh(&inetsw_lock); 1209 1210 if (p->type >= SOCK_MAX) 1211 goto out_illegal; 1212 1213 /* If we are trying to override a permanent protocol, bail. */ 1214 last_perm = &inetsw[p->type]; 1215 list_for_each(lh, &inetsw[p->type]) { 1216 answer = list_entry(lh, struct inet_protosw, list); 1217 /* Check only the non-wild match. */ 1218 if ((INET_PROTOSW_PERMANENT & answer->flags) == 0) 1219 break; 1220 if (protocol == answer->protocol) 1221 goto out_permanent; 1222 last_perm = lh; 1223 } 1224 1225 /* Add the new entry after the last permanent entry if any, so that 1226 * the new entry does not override a permanent entry when matched with 1227 * a wild-card protocol. But it is allowed to override any existing 1228 * non-permanent entry. This means that when we remove this entry, the 1229 * system automatically returns to the old behavior. 1230 */ 1231 list_add_rcu(&p->list, last_perm); 1232 out: 1233 spin_unlock_bh(&inetsw_lock); 1234 1235 return; 1236 1237 out_permanent: 1238 pr_err("Attempt to override permanent protocol %d\n", protocol); 1239 goto out; 1240 1241 out_illegal: 1242 pr_err("Ignoring attempt to register invalid socket type %d\n", 1243 p->type); 1244 goto out; 1245 } 1246 EXPORT_SYMBOL(inet_register_protosw); 1247 1248 void inet_unregister_protosw(struct inet_protosw *p) 1249 { 1250 if (INET_PROTOSW_PERMANENT & p->flags) { 1251 pr_err("Attempt to unregister permanent protocol %d\n", 1252 p->protocol); 1253 } else { 1254 spin_lock_bh(&inetsw_lock); 1255 list_del_rcu(&p->list); 1256 spin_unlock_bh(&inetsw_lock); 1257 1258 synchronize_net(); 1259 } 1260 } 1261 EXPORT_SYMBOL(inet_unregister_protosw); 1262 1263 static int inet_sk_reselect_saddr(struct sock *sk) 1264 { 1265 struct inet_sock *inet = inet_sk(sk); 1266 __be32 old_saddr = inet->inet_saddr; 1267 __be32 daddr = inet->inet_daddr; 1268 struct flowi4 *fl4; 1269 struct rtable *rt; 1270 __be32 new_saddr; 1271 struct ip_options_rcu *inet_opt; 1272 int err; 1273 1274 inet_opt = rcu_dereference_protected(inet->inet_opt, 1275 lockdep_sock_is_held(sk)); 1276 if (inet_opt && inet_opt->opt.srr) 1277 daddr = inet_opt->opt.faddr; 1278 1279 /* Query new route. */ 1280 fl4 = &inet->cork.fl.u.ip4; 1281 rt = ip_route_connect(fl4, daddr, 0, sk->sk_bound_dev_if, 1282 sk->sk_protocol, inet->inet_sport, 1283 inet->inet_dport, sk); 1284 if (IS_ERR(rt)) 1285 return PTR_ERR(rt); 1286 1287 new_saddr = fl4->saddr; 1288 1289 if (new_saddr == old_saddr) { 1290 sk_setup_caps(sk, &rt->dst); 1291 return 0; 1292 } 1293 1294 err = inet_bhash2_update_saddr(sk, &new_saddr, AF_INET); 1295 if (err) { 1296 ip_rt_put(rt); 1297 return err; 1298 } 1299 1300 sk_setup_caps(sk, &rt->dst); 1301 1302 if (READ_ONCE(sock_net(sk)->ipv4.sysctl_ip_dynaddr) > 1) { 1303 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n", 1304 __func__, &old_saddr, &new_saddr); 1305 } 1306 1307 /* 1308 * XXX The only one ugly spot where we need to 1309 * XXX really change the sockets identity after 1310 * XXX it has entered the hashes. -DaveM 1311 * 1312 * Besides that, it does not check for connection 1313 * uniqueness. Wait for troubles. 1314 */ 1315 return __sk_prot_rehash(sk); 1316 } 1317 1318 int inet_sk_rebuild_header(struct sock *sk) 1319 { 1320 struct rtable *rt = dst_rtable(__sk_dst_check(sk, 0)); 1321 struct inet_sock *inet = inet_sk(sk); 1322 struct flowi4 *fl4; 1323 int err; 1324 1325 /* Route is OK, nothing to do. */ 1326 if (rt) 1327 return 0; 1328 1329 /* Reroute. */ 1330 fl4 = &inet->cork.fl.u.ip4; 1331 inet_sk_init_flowi4(inet, fl4); 1332 rt = ip_route_output_flow(sock_net(sk), fl4, sk); 1333 if (!IS_ERR(rt)) { 1334 err = 0; 1335 sk_setup_caps(sk, &rt->dst); 1336 } else { 1337 err = PTR_ERR(rt); 1338 1339 /* Routing failed... */ 1340 sk->sk_route_caps = 0; 1341 1342 if (!READ_ONCE(sock_net(sk)->ipv4.sysctl_ip_dynaddr) || 1343 sk->sk_state != TCP_SYN_SENT || 1344 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 1345 (err = inet_sk_reselect_saddr(sk)) != 0) 1346 WRITE_ONCE(sk->sk_err_soft, -err); 1347 } 1348 1349 return err; 1350 } 1351 1352 void inet_sk_set_state(struct sock *sk, int state) 1353 { 1354 trace_inet_sock_set_state(sk, sk->sk_state, state); 1355 sk->sk_state = state; 1356 } 1357 EXPORT_SYMBOL(inet_sk_set_state); 1358 1359 void inet_sk_state_store(struct sock *sk, int newstate) 1360 { 1361 trace_inet_sock_set_state(sk, sk->sk_state, newstate); 1362 smp_store_release(&sk->sk_state, newstate); 1363 } 1364 1365 struct sk_buff *inet_gso_segment(struct sk_buff *skb, 1366 netdev_features_t features) 1367 { 1368 bool udpfrag = false, fixedid = false, gso_partial, encap; 1369 struct sk_buff *segs = ERR_PTR(-EINVAL); 1370 const struct net_offload *ops; 1371 unsigned int offset = 0; 1372 struct iphdr *iph; 1373 int proto, tot_len; 1374 int nhoff; 1375 int ihl; 1376 int id; 1377 1378 skb_reset_network_header(skb); 1379 if (unlikely(gso_recursion_inc_test(skb, 1380 IP_TUNNEL_RECURSION_LIMIT))) 1381 goto out; 1382 nhoff = skb_network_header(skb) - skb_mac_header(skb); 1383 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1384 goto out; 1385 1386 iph = ip_hdr(skb); 1387 ihl = iph->ihl * 4; 1388 if (ihl < sizeof(*iph)) 1389 goto out; 1390 1391 id = ntohs(iph->id); 1392 proto = iph->protocol; 1393 1394 /* Warning: after this point, iph might be no longer valid */ 1395 if (unlikely(!pskb_may_pull(skb, ihl))) 1396 goto out; 1397 __skb_pull(skb, ihl); 1398 1399 encap = SKB_GSO_CB(skb)->encap_level > 0; 1400 if (encap) 1401 features &= skb->dev->hw_enc_features; 1402 SKB_GSO_CB(skb)->encap_level += ihl; 1403 1404 skb_reset_transport_header(skb); 1405 1406 segs = ERR_PTR(-EPROTONOSUPPORT); 1407 1408 fixedid = !!(skb_shinfo(skb)->gso_type & (SKB_GSO_TCP_FIXEDID << encap)); 1409 1410 if (!skb->encapsulation || encap) 1411 udpfrag = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP); 1412 1413 ops = rcu_dereference(inet_offloads[proto]); 1414 if (likely(ops && ops->callbacks.gso_segment)) { 1415 segs = ops->callbacks.gso_segment(skb, features); 1416 if (!segs) 1417 skb->network_header = skb_mac_header(skb) + nhoff - skb->head; 1418 } 1419 1420 if (IS_ERR_OR_NULL(segs)) 1421 goto out; 1422 1423 gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL); 1424 1425 skb = segs; 1426 do { 1427 iph = (struct iphdr *)(skb_mac_header(skb) + nhoff); 1428 if (udpfrag) { 1429 iph->frag_off = htons(offset >> 3); 1430 if (skb->next) 1431 iph->frag_off |= htons(IP_MF); 1432 offset += skb->len - nhoff - ihl; 1433 tot_len = skb->len - nhoff; 1434 } else if (skb_is_gso(skb)) { 1435 if (!fixedid) { 1436 iph->id = htons(id); 1437 id += skb_shinfo(skb)->gso_segs; 1438 } 1439 1440 if (gso_partial) 1441 tot_len = skb_shinfo(skb)->gso_size + 1442 SKB_GSO_CB(skb)->data_offset + 1443 skb->head - (unsigned char *)iph; 1444 else 1445 tot_len = skb->len - nhoff; 1446 } else { 1447 if (!fixedid) 1448 iph->id = htons(id++); 1449 tot_len = skb->len - nhoff; 1450 } 1451 iph->tot_len = htons(tot_len); 1452 ip_send_check(iph); 1453 if (encap) 1454 skb_reset_inner_headers(skb); 1455 skb->network_header = (u8 *)iph - skb->head; 1456 skb_reset_mac_len(skb); 1457 } while ((skb = skb->next)); 1458 1459 out: 1460 return segs; 1461 } 1462 1463 static struct sk_buff *ipip_gso_segment(struct sk_buff *skb, 1464 netdev_features_t features) 1465 { 1466 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_IPXIP4)) 1467 return ERR_PTR(-EINVAL); 1468 1469 return inet_gso_segment(skb, features); 1470 } 1471 1472 struct sk_buff *inet_gro_receive(struct list_head *head, struct sk_buff *skb) 1473 { 1474 const struct net_offload *ops; 1475 struct sk_buff *pp = NULL; 1476 const struct iphdr *iph; 1477 struct sk_buff *p; 1478 unsigned int hlen; 1479 unsigned int off; 1480 int flush = 1; 1481 int proto; 1482 1483 off = skb_gro_offset(skb); 1484 hlen = off + sizeof(*iph); 1485 iph = skb_gro_header(skb, hlen, off); 1486 if (unlikely(!iph)) 1487 goto out; 1488 1489 proto = iph->protocol; 1490 1491 ops = rcu_dereference(inet_offloads[proto]); 1492 if (!ops || !ops->callbacks.gro_receive) 1493 goto out; 1494 1495 if (*(u8 *)iph != 0x45) 1496 goto out; 1497 1498 if (ip_is_fragment(iph)) 1499 goto out; 1500 1501 if (unlikely(ip_fast_csum((u8 *)iph, 5))) 1502 goto out; 1503 1504 NAPI_GRO_CB(skb)->proto = proto; 1505 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (ntohl(*(__be32 *)&iph->id) & ~IP_DF)); 1506 1507 list_for_each_entry(p, head, list) { 1508 struct iphdr *iph2; 1509 1510 if (!NAPI_GRO_CB(p)->same_flow) 1511 continue; 1512 1513 iph2 = (struct iphdr *)(p->data + off); 1514 /* The above works because, with the exception of the top 1515 * (inner most) layer, we only aggregate pkts with the same 1516 * hdr length so all the hdrs we'll need to verify will start 1517 * at the same offset. 1518 */ 1519 if ((iph->protocol ^ iph2->protocol) | 1520 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) | 1521 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) { 1522 NAPI_GRO_CB(p)->same_flow = 0; 1523 continue; 1524 } 1525 } 1526 1527 NAPI_GRO_CB(skb)->flush |= flush; 1528 NAPI_GRO_CB(skb)->network_offsets[NAPI_GRO_CB(skb)->encap_mark] = off; 1529 1530 /* Note : No need to call skb_gro_postpull_rcsum() here, 1531 * as we already checked checksum over ipv4 header was 0 1532 */ 1533 skb_gro_pull(skb, sizeof(*iph)); 1534 skb_set_transport_header(skb, skb_gro_offset(skb)); 1535 1536 pp = indirect_call_gro_receive(tcp4_gro_receive, udp4_gro_receive, 1537 ops->callbacks.gro_receive, head, skb); 1538 1539 out: 1540 skb_gro_flush_final(skb, pp, flush); 1541 1542 return pp; 1543 } 1544 EXPORT_INDIRECT_CALLABLE(inet_gro_receive); 1545 1546 static struct sk_buff *ipip_gro_receive(struct list_head *head, 1547 struct sk_buff *skb) 1548 { 1549 if (NAPI_GRO_CB(skb)->encap_mark) { 1550 NAPI_GRO_CB(skb)->flush = 1; 1551 return NULL; 1552 } 1553 1554 NAPI_GRO_CB(skb)->encap_mark = 1; 1555 1556 return inet_gro_receive(head, skb); 1557 } 1558 1559 #define SECONDS_PER_DAY 86400 1560 1561 /* inet_current_timestamp - Return IP network timestamp 1562 * 1563 * Return milliseconds since midnight in network byte order. 1564 */ 1565 __be32 inet_current_timestamp(void) 1566 { 1567 u32 secs; 1568 u32 msecs; 1569 struct timespec64 ts; 1570 1571 ktime_get_real_ts64(&ts); 1572 1573 /* Get secs since midnight. */ 1574 (void)div_u64_rem(ts.tv_sec, SECONDS_PER_DAY, &secs); 1575 /* Convert to msecs. */ 1576 msecs = secs * MSEC_PER_SEC; 1577 /* Convert nsec to msec. */ 1578 msecs += (u32)ts.tv_nsec / NSEC_PER_MSEC; 1579 1580 /* Convert to network byte order. */ 1581 return htonl(msecs); 1582 } 1583 1584 int inet_recv_error(struct sock *sk, struct msghdr *msg, int len) 1585 { 1586 unsigned int family = READ_ONCE(sk->sk_family); 1587 1588 if (family == AF_INET) 1589 return ip_recv_error(sk, msg, len); 1590 #if IS_ENABLED(CONFIG_IPV6) 1591 if (family == AF_INET6) 1592 return pingv6_ops.ipv6_recv_error(sk, msg, len); 1593 #endif 1594 return -EINVAL; 1595 } 1596 EXPORT_SYMBOL(inet_recv_error); 1597 1598 int inet_gro_complete(struct sk_buff *skb, int nhoff) 1599 { 1600 struct iphdr *iph = (struct iphdr *)(skb->data + nhoff); 1601 const struct net_offload *ops; 1602 __be16 totlen = iph->tot_len; 1603 int proto = iph->protocol; 1604 int err = -ENOSYS; 1605 1606 if (skb->encapsulation) { 1607 skb_set_inner_protocol(skb, cpu_to_be16(ETH_P_IP)); 1608 skb_set_inner_network_header(skb, nhoff); 1609 } 1610 1611 iph_set_totlen(iph, skb->len - nhoff); 1612 csum_replace2(&iph->check, totlen, iph->tot_len); 1613 1614 ops = rcu_dereference(inet_offloads[proto]); 1615 if (WARN_ON(!ops || !ops->callbacks.gro_complete)) 1616 goto out; 1617 1618 /* Only need to add sizeof(*iph) to get to the next hdr below 1619 * because any hdr with option will have been flushed in 1620 * inet_gro_receive(). 1621 */ 1622 err = INDIRECT_CALL_2(ops->callbacks.gro_complete, 1623 tcp4_gro_complete, udp4_gro_complete, 1624 skb, nhoff + sizeof(*iph)); 1625 1626 out: 1627 return err; 1628 } 1629 EXPORT_INDIRECT_CALLABLE(inet_gro_complete); 1630 1631 static int ipip_gro_complete(struct sk_buff *skb, int nhoff) 1632 { 1633 skb->encapsulation = 1; 1634 skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4; 1635 return inet_gro_complete(skb, nhoff); 1636 } 1637 1638 int inet_ctl_sock_create(struct sock **sk, unsigned short family, 1639 unsigned short type, unsigned char protocol, 1640 struct net *net) 1641 { 1642 struct socket *sock; 1643 int rc = sock_create_kern(net, family, type, protocol, &sock); 1644 1645 if (rc == 0) { 1646 *sk = sock->sk; 1647 (*sk)->sk_allocation = GFP_ATOMIC; 1648 (*sk)->sk_use_task_frag = false; 1649 /* 1650 * Unhash it so that IP input processing does not even see it, 1651 * we do not wish this socket to see incoming packets. 1652 */ 1653 (*sk)->sk_prot->unhash(*sk); 1654 } 1655 return rc; 1656 } 1657 EXPORT_SYMBOL_GPL(inet_ctl_sock_create); 1658 1659 unsigned long snmp_fold_field(void __percpu *mib, int offt) 1660 { 1661 unsigned long res = 0; 1662 int i; 1663 1664 for_each_possible_cpu(i) 1665 res += snmp_get_cpu_field(mib, i, offt); 1666 return res; 1667 } 1668 1669 #if BITS_PER_LONG==32 1670 1671 u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offt, 1672 size_t syncp_offset) 1673 { 1674 void *bhptr; 1675 struct u64_stats_sync *syncp; 1676 u64 v; 1677 unsigned int start; 1678 1679 bhptr = per_cpu_ptr(mib, cpu); 1680 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset); 1681 do { 1682 start = u64_stats_fetch_begin(syncp); 1683 v = *(((u64 *)bhptr) + offt); 1684 } while (u64_stats_fetch_retry(syncp, start)); 1685 1686 return v; 1687 } 1688 1689 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset) 1690 { 1691 u64 res = 0; 1692 int cpu; 1693 1694 for_each_possible_cpu(cpu) { 1695 res += snmp_get_cpu_field64(mib, cpu, offt, syncp_offset); 1696 } 1697 return res; 1698 } 1699 #endif 1700 1701 #ifdef CONFIG_IP_MULTICAST 1702 static const struct net_protocol igmp_protocol = { 1703 .handler = igmp_rcv, 1704 }; 1705 #endif 1706 1707 static const struct net_protocol icmp_protocol = { 1708 .handler = icmp_rcv, 1709 .err_handler = icmp_err, 1710 .no_policy = 1, 1711 }; 1712 1713 static __net_init int ipv4_mib_init_net(struct net *net) 1714 { 1715 int i; 1716 1717 net->mib.tcp_statistics = alloc_percpu(struct tcp_mib); 1718 if (!net->mib.tcp_statistics) 1719 goto err_tcp_mib; 1720 net->mib.ip_statistics = alloc_percpu(struct ipstats_mib); 1721 if (!net->mib.ip_statistics) 1722 goto err_ip_mib; 1723 1724 for_each_possible_cpu(i) { 1725 struct ipstats_mib *af_inet_stats; 1726 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i); 1727 u64_stats_init(&af_inet_stats->syncp); 1728 } 1729 1730 net->mib.net_statistics = alloc_percpu(struct linux_mib); 1731 if (!net->mib.net_statistics) 1732 goto err_net_mib; 1733 net->mib.udp_statistics = alloc_percpu(struct udp_mib); 1734 if (!net->mib.udp_statistics) 1735 goto err_udp_mib; 1736 net->mib.icmp_statistics = alloc_percpu(struct icmp_mib); 1737 if (!net->mib.icmp_statistics) 1738 goto err_icmp_mib; 1739 net->mib.icmpmsg_statistics = kzalloc_obj(struct icmpmsg_mib); 1740 if (!net->mib.icmpmsg_statistics) 1741 goto err_icmpmsg_mib; 1742 1743 tcp_mib_init(net); 1744 return 0; 1745 1746 err_icmpmsg_mib: 1747 free_percpu(net->mib.icmp_statistics); 1748 err_icmp_mib: 1749 free_percpu(net->mib.udp_statistics); 1750 err_udp_mib: 1751 free_percpu(net->mib.net_statistics); 1752 err_net_mib: 1753 free_percpu(net->mib.ip_statistics); 1754 err_ip_mib: 1755 free_percpu(net->mib.tcp_statistics); 1756 err_tcp_mib: 1757 return -ENOMEM; 1758 } 1759 1760 static __net_exit void ipv4_mib_exit_net(struct net *net) 1761 { 1762 kfree(net->mib.icmpmsg_statistics); 1763 free_percpu(net->mib.icmp_statistics); 1764 free_percpu(net->mib.udp_statistics); 1765 free_percpu(net->mib.net_statistics); 1766 free_percpu(net->mib.ip_statistics); 1767 free_percpu(net->mib.tcp_statistics); 1768 #ifdef CONFIG_MPTCP 1769 /* allocated on demand, see mptcp_init_sock() */ 1770 free_percpu(net->mib.mptcp_statistics); 1771 #endif 1772 } 1773 1774 static __net_initdata struct pernet_operations ipv4_mib_ops = { 1775 .init = ipv4_mib_init_net, 1776 .exit = ipv4_mib_exit_net, 1777 }; 1778 1779 static int __init init_ipv4_mibs(void) 1780 { 1781 return register_pernet_subsys(&ipv4_mib_ops); 1782 } 1783 1784 static __net_init int inet_init_net(struct net *net) 1785 { 1786 /* 1787 * Set defaults for local port range 1788 */ 1789 net->ipv4.ip_local_ports.range = 60999u << 16 | 32768u; 1790 1791 seqlock_init(&net->ipv4.ping_group_range.lock); 1792 /* 1793 * Sane defaults - nobody may create ping sockets. 1794 * Boot scripts should set this to distro-specific group. 1795 */ 1796 net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1); 1797 net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0); 1798 1799 /* Default values for sysctl-controlled parameters. 1800 * We set them here, in case sysctl is not compiled. 1801 */ 1802 net->ipv4.sysctl_ip_default_ttl = IPDEFTTL; 1803 net->ipv4.sysctl_ip_fwd_update_priority = 1; 1804 net->ipv4.sysctl_ip_dynaddr = 0; 1805 net->ipv4.sysctl_ip_early_demux = 1; 1806 net->ipv4.sysctl_udp_early_demux = 1; 1807 net->ipv4.sysctl_tcp_early_demux = 1; 1808 net->ipv4.sysctl_nexthop_compat_mode = 1; 1809 #ifdef CONFIG_SYSCTL 1810 net->ipv4.sysctl_ip_prot_sock = PROT_SOCK; 1811 #endif 1812 1813 /* Some igmp sysctl, whose values are always used */ 1814 net->ipv4.sysctl_igmp_max_memberships = 20; 1815 net->ipv4.sysctl_igmp_max_msf = 10; 1816 /* IGMP reports for link-local multicast groups are enabled by default */ 1817 net->ipv4.sysctl_igmp_llm_reports = 1; 1818 net->ipv4.sysctl_igmp_qrv = 2; 1819 1820 net->ipv4.sysctl_fib_notify_on_flag_change = 0; 1821 1822 return 0; 1823 } 1824 1825 static __net_initdata struct pernet_operations af_inet_ops = { 1826 .init = inet_init_net, 1827 }; 1828 1829 static int __init init_inet_pernet_ops(void) 1830 { 1831 return register_pernet_subsys(&af_inet_ops); 1832 } 1833 1834 static int ipv4_proc_init(void); 1835 1836 /* 1837 * IP protocol layer initialiser 1838 */ 1839 1840 1841 static const struct net_offload ipip_offload = { 1842 .callbacks = { 1843 .gso_segment = ipip_gso_segment, 1844 .gro_receive = ipip_gro_receive, 1845 .gro_complete = ipip_gro_complete, 1846 }, 1847 }; 1848 1849 static int __init ipip_offload_init(void) 1850 { 1851 return inet_add_offload(&ipip_offload, IPPROTO_IPIP); 1852 } 1853 1854 static int __init ipv4_offload_init(void) 1855 { 1856 /* 1857 * Add offloads 1858 */ 1859 if (udpv4_offload_init() < 0) 1860 pr_crit("%s: Cannot add UDP protocol offload\n", __func__); 1861 if (tcpv4_offload_init() < 0) 1862 pr_crit("%s: Cannot add TCP protocol offload\n", __func__); 1863 if (ipip_offload_init() < 0) 1864 pr_crit("%s: Cannot add IPIP protocol offload\n", __func__); 1865 1866 net_hotdata.ip_packet_offload = (struct packet_offload) { 1867 .type = cpu_to_be16(ETH_P_IP), 1868 .callbacks = { 1869 .gso_segment = inet_gso_segment, 1870 .gro_receive = inet_gro_receive, 1871 .gro_complete = inet_gro_complete, 1872 }, 1873 }; 1874 dev_add_offload(&net_hotdata.ip_packet_offload); 1875 return 0; 1876 } 1877 1878 fs_initcall(ipv4_offload_init); 1879 1880 static struct packet_type ip_packet_type __read_mostly = { 1881 .type = cpu_to_be16(ETH_P_IP), 1882 .func = ip_rcv, 1883 .list_func = ip_list_rcv, 1884 }; 1885 1886 static int __init inet_init(void) 1887 { 1888 struct inet_protosw *q; 1889 struct list_head *r; 1890 int rc; 1891 1892 sock_skb_cb_check_size(sizeof(struct inet_skb_parm)); 1893 1894 raw_hashinfo_init(&raw_v4_hashinfo); 1895 1896 rc = proto_register(&tcp_prot, 1); 1897 if (rc) 1898 goto out; 1899 1900 rc = proto_register(&udp_prot, 1); 1901 if (rc) 1902 goto out_unregister_tcp_proto; 1903 1904 rc = proto_register(&raw_prot, 1); 1905 if (rc) 1906 goto out_unregister_udp_proto; 1907 1908 rc = proto_register(&ping_prot, 1); 1909 if (rc) 1910 goto out_unregister_raw_proto; 1911 1912 /* 1913 * Tell SOCKET that we are alive... 1914 */ 1915 1916 (void)sock_register(&inet_family_ops); 1917 1918 #ifdef CONFIG_SYSCTL 1919 ip_static_sysctl_init(); 1920 #endif 1921 1922 /* 1923 * Add all the base protocols. 1924 */ 1925 1926 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 1927 pr_crit("%s: Cannot add ICMP protocol\n", __func__); 1928 1929 net_hotdata.udp_protocol = (struct net_protocol) { 1930 .handler = udp_rcv, 1931 .err_handler = udp_err, 1932 .no_policy = 1, 1933 }; 1934 if (inet_add_protocol(&net_hotdata.udp_protocol, IPPROTO_UDP) < 0) 1935 pr_crit("%s: Cannot add UDP protocol\n", __func__); 1936 1937 net_hotdata.tcp_protocol = (struct net_protocol) { 1938 .handler = tcp_v4_rcv, 1939 .err_handler = tcp_v4_err, 1940 .no_policy = 1, 1941 .icmp_strict_tag_validation = 1, 1942 }; 1943 if (inet_add_protocol(&net_hotdata.tcp_protocol, IPPROTO_TCP) < 0) 1944 pr_crit("%s: Cannot add TCP protocol\n", __func__); 1945 #ifdef CONFIG_IP_MULTICAST 1946 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 1947 pr_crit("%s: Cannot add IGMP protocol\n", __func__); 1948 #endif 1949 1950 /* Register the socket-side information for inet_create. */ 1951 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 1952 INIT_LIST_HEAD(r); 1953 1954 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 1955 inet_register_protosw(q); 1956 1957 /* 1958 * Set the ARP module up 1959 */ 1960 1961 arp_init(); 1962 1963 /* 1964 * Set the IP module up 1965 */ 1966 1967 ip_init(); 1968 1969 /* Initialise per-cpu ipv4 mibs */ 1970 if (init_ipv4_mibs()) 1971 panic("%s: Cannot init ipv4 mibs\n", __func__); 1972 1973 /* Setup TCP slab cache for open requests. */ 1974 tcp_init(); 1975 1976 /* Setup UDP memory threshold */ 1977 udp_init(); 1978 1979 raw_init(); 1980 1981 ping_init(); 1982 1983 /* 1984 * Set the ICMP layer up 1985 */ 1986 1987 if (icmp_init() < 0) 1988 panic("Failed to create the ICMP control socket.\n"); 1989 1990 /* 1991 * Initialise the multicast router 1992 */ 1993 #if defined(CONFIG_IP_MROUTE) 1994 if (ip_mr_init()) 1995 pr_crit("%s: Cannot init ipv4 mroute\n", __func__); 1996 #endif 1997 1998 if (init_inet_pernet_ops()) 1999 pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__); 2000 2001 ipv4_proc_init(); 2002 2003 ipfrag_init(); 2004 2005 dev_add_pack(&ip_packet_type); 2006 2007 ip_tunnel_core_init(); 2008 2009 rc = 0; 2010 out: 2011 return rc; 2012 out_unregister_raw_proto: 2013 proto_unregister(&raw_prot); 2014 out_unregister_udp_proto: 2015 proto_unregister(&udp_prot); 2016 out_unregister_tcp_proto: 2017 proto_unregister(&tcp_prot); 2018 goto out; 2019 } 2020 2021 fs_initcall(inet_init); 2022 2023 /* ------------------------------------------------------------------------ */ 2024 2025 #ifdef CONFIG_PROC_FS 2026 static int __init ipv4_proc_init(void) 2027 { 2028 int rc = 0; 2029 2030 if (raw_proc_init()) 2031 goto out_raw; 2032 if (tcp4_proc_init()) 2033 goto out_tcp; 2034 if (udp4_proc_init()) 2035 goto out_udp; 2036 if (ping_proc_init()) 2037 goto out_ping; 2038 if (ip_misc_proc_init()) 2039 goto out_misc; 2040 out: 2041 return rc; 2042 out_misc: 2043 ping_proc_exit(); 2044 out_ping: 2045 udp4_proc_exit(); 2046 out_udp: 2047 tcp4_proc_exit(); 2048 out_tcp: 2049 raw_proc_exit(); 2050 out_raw: 2051 rc = -ENOMEM; 2052 goto out; 2053 } 2054 2055 #else /* CONFIG_PROC_FS */ 2056 static int __init ipv4_proc_init(void) 2057 { 2058 return 0; 2059 } 2060 #endif /* CONFIG_PROC_FS */ 2061