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