1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * INET An implementation of the TCP/IP protocol suite for the LINUX 4 * operating system. INET is implemented using the BSD Socket 5 * interface as the means of communication with the user level. 6 * 7 * PF_INET protocol family socket handler. 8 * 9 * Authors: Ross Biro 10 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 11 * Florian La Roche, <flla@stud.uni-sb.de> 12 * Alan Cox, <A.Cox@swansea.ac.uk> 13 * 14 * Changes (see also sock.c) 15 * 16 * piggy, 17 * Karl Knutson : Socket protocol table 18 * A.N.Kuznetsov : Socket death error in accept(). 19 * John Richardson : Fix non blocking error in connect() 20 * so sockets that fail to connect 21 * don't return -EINPROGRESS. 22 * Alan Cox : Asynchronous I/O support 23 * Alan Cox : Keep correct socket pointer on sock 24 * structures 25 * when accept() ed 26 * Alan Cox : Semantics of SO_LINGER aren't state 27 * moved to close when you look carefully. 28 * With this fixed and the accept bug fixed 29 * some RPC stuff seems happier. 30 * Niibe Yutaka : 4.4BSD style write async I/O 31 * Alan Cox, 32 * Tony Gale : Fixed reuse semantics. 33 * Alan Cox : bind() shouldn't abort existing but dead 34 * sockets. Stops FTP netin:.. I hope. 35 * Alan Cox : bind() works correctly for RAW sockets. 36 * Note that FreeBSD at least was broken 37 * in this respect so be careful with 38 * compatibility tests... 39 * Alan Cox : routing cache support 40 * Alan Cox : memzero the socket structure for 41 * compactness. 42 * Matt Day : nonblock connect error handler 43 * Alan Cox : Allow large numbers of pending sockets 44 * (eg for big web sites), but only if 45 * specifically application requested. 46 * Alan Cox : New buffering throughout IP. Used 47 * dumbly. 48 * Alan Cox : New buffering now used smartly. 49 * Alan Cox : BSD rather than common sense 50 * interpretation of listen. 51 * Germano Caronni : Assorted small races. 52 * Alan Cox : sendmsg/recvmsg basic support. 53 * Alan Cox : Only sendmsg/recvmsg now supported. 54 * Alan Cox : Locked down bind (see security list). 55 * Alan Cox : Loosened bind a little. 56 * Mike McLagan : ADD/DEL DLCI Ioctls 57 * Willy Konynenberg : Transparent proxying support. 58 * David S. Miller : New socket lookup architecture. 59 * Some other random speedups. 60 * Cyrus Durgin : Cleaned up file for kmod hacks. 61 * Andi Kleen : Fix inet_stream_connect TCP race. 62 */ 63 64 #define pr_fmt(fmt) "IPv4: " fmt 65 66 #include <linux/err.h> 67 #include <linux/errno.h> 68 #include <linux/types.h> 69 #include <linux/socket.h> 70 #include <linux/in.h> 71 #include <linux/kernel.h> 72 #include <linux/kmod.h> 73 #include <linux/sched.h> 74 #include <linux/timer.h> 75 #include <linux/string.h> 76 #include <linux/sockios.h> 77 #include <linux/net.h> 78 #include <linux/capability.h> 79 #include <linux/fcntl.h> 80 #include <linux/mm.h> 81 #include <linux/interrupt.h> 82 #include <linux/stat.h> 83 #include <linux/init.h> 84 #include <linux/poll.h> 85 #include <linux/netfilter_ipv4.h> 86 #include <linux/random.h> 87 #include <linux/slab.h> 88 89 #include <linux/uaccess.h> 90 91 #include <linux/inet.h> 92 #include <linux/igmp.h> 93 #include <linux/inetdevice.h> 94 #include <linux/netdevice.h> 95 #include <net/checksum.h> 96 #include <net/ip.h> 97 #include <net/protocol.h> 98 #include <net/arp.h> 99 #include <net/route.h> 100 #include <net/ip_fib.h> 101 #include <net/inet_connection_sock.h> 102 #include <net/gro.h> 103 #include <net/gso.h> 104 #include <net/tcp.h> 105 #include <net/psp.h> 106 #include <net/udp.h> 107 #include <net/udplite.h> 108 #include <net/ping.h> 109 #include <linux/skbuff.h> 110 #include <net/sock.h> 111 #include <net/raw.h> 112 #include <net/icmp.h> 113 #include <net/inet_common.h> 114 #include <net/ip_tunnels.h> 115 #include <net/xfrm.h> 116 #include <net/net_namespace.h> 117 #include <net/secure_seq.h> 118 #ifdef CONFIG_IP_MROUTE 119 #include <linux/mroute.h> 120 #endif 121 #include <net/l3mdev.h> 122 #include <net/compat.h> 123 #include <net/rps.h> 124 125 #include <trace/events/sock.h> 126 127 /* Keep the definition of IPv6 disable here for now, to avoid annoying linker 128 * issues in case IPv6=m 129 */ 130 int disable_ipv6_mod; 131 EXPORT_SYMBOL(disable_ipv6_mod); 132 133 /* The inetsw table contains everything that inet_create needs to 134 * build a new socket. 135 */ 136 static struct list_head inetsw[SOCK_MAX]; 137 static DEFINE_SPINLOCK(inetsw_lock); 138 139 /* New destruction routine */ 140 141 void inet_sock_destruct(struct sock *sk) 142 { 143 struct inet_sock *inet = inet_sk(sk); 144 145 __skb_queue_purge(&sk->sk_receive_queue); 146 __skb_queue_purge(&sk->sk_error_queue); 147 148 sk_mem_reclaim_final(sk); 149 150 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) { 151 pr_err("Attempt to release TCP socket in state %d %p\n", 152 sk->sk_state, sk); 153 return; 154 } 155 if (!sock_flag(sk, SOCK_DEAD)) { 156 pr_err("Attempt to release alive inet socket %p\n", sk); 157 return; 158 } 159 160 WARN_ON_ONCE(atomic_read(&sk->sk_rmem_alloc)); 161 WARN_ON_ONCE(refcount_read(&sk->sk_wmem_alloc)); 162 WARN_ON_ONCE(sk->sk_wmem_queued); 163 WARN_ON_ONCE(sk->sk_forward_alloc); 164 165 kfree(rcu_dereference_protected(inet->inet_opt, 1)); 166 dst_release(rcu_dereference_protected(sk->sk_dst_cache, 1)); 167 dst_release(rcu_dereference_protected(sk->sk_rx_dst, 1)); 168 psp_sk_assoc_free(sk); 169 } 170 EXPORT_SYMBOL(inet_sock_destruct); 171 172 /* 173 * The routines beyond this point handle the behaviour of an AF_INET 174 * socket object. Mostly it punts to the subprotocols of IP to do 175 * the work. 176 */ 177 178 /* 179 * Automatically bind an unbound socket. 180 */ 181 182 static int inet_autobind(struct sock *sk) 183 { 184 struct inet_sock *inet; 185 /* We may need to bind the socket. */ 186 lock_sock(sk); 187 inet = inet_sk(sk); 188 if (!inet->inet_num) { 189 if (sk->sk_prot->get_port(sk, 0)) { 190 release_sock(sk); 191 return -EAGAIN; 192 } 193 inet->inet_sport = htons(inet->inet_num); 194 } 195 release_sock(sk); 196 return 0; 197 } 198 199 int __inet_listen_sk(struct sock *sk, int backlog) 200 { 201 unsigned char old_state = sk->sk_state; 202 int err, tcp_fastopen; 203 204 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN))) 205 return -EINVAL; 206 207 WRITE_ONCE(sk->sk_max_ack_backlog, backlog); 208 /* Really, if the socket is already in listen state 209 * we can only allow the backlog to be adjusted. 210 */ 211 if (old_state != TCP_LISTEN) { 212 /* Enable TFO w/o requiring TCP_FASTOPEN socket option. 213 * Note that only TCP sockets (SOCK_STREAM) will reach here. 214 * Also fastopen backlog may already been set via the option 215 * because the socket was in TCP_LISTEN state previously but 216 * was shutdown() rather than close(). 217 */ 218 tcp_fastopen = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_fastopen); 219 if ((tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) && 220 (tcp_fastopen & TFO_SERVER_ENABLE) && 221 !inet_csk(sk)->icsk_accept_queue.fastopenq.max_qlen) { 222 fastopen_queue_tune(sk, backlog); 223 tcp_fastopen_init_key_once(sock_net(sk)); 224 } 225 226 err = inet_csk_listen_start(sk); 227 if (err) 228 return err; 229 230 tcp_call_bpf(sk, BPF_SOCK_OPS_TCP_LISTEN_CB, 0, NULL); 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 EXPORT_SYMBOL_GPL(inet_send_prepare); 857 858 int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) 859 { 860 struct sock *sk = sock->sk; 861 862 if (unlikely(inet_send_prepare(sk))) 863 return -EAGAIN; 864 865 return INDIRECT_CALL_2(sk->sk_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 EXPORT_SYMBOL_GPL(inet_splice_eof); 884 885 INDIRECT_CALLABLE_DECLARE(int udp_recvmsg(struct sock *, struct msghdr *, 886 size_t, int, int *)); 887 int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 888 int flags) 889 { 890 struct sock *sk = sock->sk; 891 int addr_len = 0; 892 int err; 893 894 if (likely(!(flags & MSG_ERRQUEUE))) 895 sock_rps_record_flow(sk); 896 897 err = INDIRECT_CALL_2(sk->sk_prot->recvmsg, tcp_recvmsg, udp_recvmsg, 898 sk, msg, size, flags, &addr_len); 899 if (err >= 0) 900 msg->msg_namelen = addr_len; 901 return err; 902 } 903 EXPORT_SYMBOL(inet_recvmsg); 904 905 int inet_shutdown(struct socket *sock, int how) 906 { 907 struct sock *sk = sock->sk; 908 int err = 0; 909 910 /* This should really check to make sure 911 * the socket is a TCP socket. (WHY AC...) 912 */ 913 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and 914 1->2 bit 2 snds. 915 2->3 */ 916 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ 917 return -EINVAL; 918 919 lock_sock(sk); 920 if (sock->state == SS_CONNECTING) { 921 if ((1 << sk->sk_state) & 922 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) 923 sock->state = SS_DISCONNECTING; 924 else 925 sock->state = SS_CONNECTED; 926 } 927 928 switch (sk->sk_state) { 929 case TCP_CLOSE: 930 err = -ENOTCONN; 931 /* Hack to wake up other listeners, who can poll for 932 EPOLLHUP, even on eg. unconnected UDP sockets -- RR */ 933 fallthrough; 934 default: 935 WRITE_ONCE(sk->sk_shutdown, sk->sk_shutdown | how); 936 if (sk->sk_prot->shutdown) 937 sk->sk_prot->shutdown(sk, how); 938 break; 939 940 /* Remaining two branches are temporary solution for missing 941 * close() in multithreaded environment. It is _not_ a good idea, 942 * but we have no choice until close() is repaired at VFS level. 943 */ 944 case TCP_LISTEN: 945 if (!(how & RCV_SHUTDOWN)) 946 break; 947 fallthrough; 948 case TCP_SYN_SENT: 949 err = sk->sk_prot->disconnect(sk, O_NONBLOCK); 950 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 951 break; 952 } 953 954 /* Wake up anyone sleeping in poll. */ 955 sk->sk_state_change(sk); 956 release_sock(sk); 957 return err; 958 } 959 EXPORT_SYMBOL(inet_shutdown); 960 961 /* 962 * ioctl() calls you can issue on an INET socket. Most of these are 963 * device configuration and stuff and very rarely used. Some ioctls 964 * pass on to the socket itself. 965 * 966 * NOTE: I like the idea of a module for the config stuff. ie ifconfig 967 * loads the devconfigure module does its configuring and unloads it. 968 * There's a good 20K of config code hanging around the kernel. 969 */ 970 971 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 972 { 973 struct sock *sk = sock->sk; 974 int err = 0; 975 struct net *net = sock_net(sk); 976 void __user *p = (void __user *)arg; 977 struct ifreq ifr; 978 struct rtentry rt; 979 980 switch (cmd) { 981 case SIOCADDRT: 982 case SIOCDELRT: 983 if (copy_from_user(&rt, p, sizeof(struct rtentry))) 984 return -EFAULT; 985 err = ip_rt_ioctl(net, cmd, &rt); 986 break; 987 case SIOCRTMSG: 988 err = -EINVAL; 989 break; 990 case SIOCDARP: 991 case SIOCGARP: 992 case SIOCSARP: 993 err = arp_ioctl(net, cmd, (void __user *)arg); 994 break; 995 case SIOCGIFADDR: 996 case SIOCGIFBRDADDR: 997 case SIOCGIFNETMASK: 998 case SIOCGIFDSTADDR: 999 case SIOCGIFPFLAGS: 1000 if (get_user_ifreq(&ifr, NULL, p)) 1001 return -EFAULT; 1002 err = devinet_ioctl(net, cmd, &ifr); 1003 if (!err && put_user_ifreq(&ifr, p)) 1004 err = -EFAULT; 1005 break; 1006 1007 case SIOCSIFADDR: 1008 case SIOCSIFBRDADDR: 1009 case SIOCSIFNETMASK: 1010 case SIOCSIFDSTADDR: 1011 case SIOCSIFPFLAGS: 1012 case SIOCSIFFLAGS: 1013 if (get_user_ifreq(&ifr, NULL, p)) 1014 return -EFAULT; 1015 err = devinet_ioctl(net, cmd, &ifr); 1016 break; 1017 default: 1018 if (sk->sk_prot->ioctl) 1019 err = sk_ioctl(sk, cmd, (void __user *)arg); 1020 else 1021 err = -ENOIOCTLCMD; 1022 break; 1023 } 1024 return err; 1025 } 1026 EXPORT_SYMBOL(inet_ioctl); 1027 1028 #ifdef CONFIG_COMPAT 1029 static int inet_compat_routing_ioctl(struct sock *sk, unsigned int cmd, 1030 struct compat_rtentry __user *ur) 1031 { 1032 compat_uptr_t rtdev; 1033 struct rtentry rt; 1034 1035 if (copy_from_user(&rt.rt_dst, &ur->rt_dst, 1036 3 * sizeof(struct sockaddr)) || 1037 get_user(rt.rt_flags, &ur->rt_flags) || 1038 get_user(rt.rt_metric, &ur->rt_metric) || 1039 get_user(rt.rt_mtu, &ur->rt_mtu) || 1040 get_user(rt.rt_window, &ur->rt_window) || 1041 get_user(rt.rt_irtt, &ur->rt_irtt) || 1042 get_user(rtdev, &ur->rt_dev)) 1043 return -EFAULT; 1044 1045 rt.rt_dev = compat_ptr(rtdev); 1046 return ip_rt_ioctl(sock_net(sk), cmd, &rt); 1047 } 1048 1049 static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1050 { 1051 void __user *argp = compat_ptr(arg); 1052 struct sock *sk = sock->sk; 1053 1054 switch (cmd) { 1055 case SIOCADDRT: 1056 case SIOCDELRT: 1057 return inet_compat_routing_ioctl(sk, cmd, argp); 1058 default: 1059 if (!sk->sk_prot->compat_ioctl) 1060 return -ENOIOCTLCMD; 1061 return sk->sk_prot->compat_ioctl(sk, cmd, arg); 1062 } 1063 } 1064 #endif /* CONFIG_COMPAT */ 1065 1066 const struct proto_ops inet_stream_ops = { 1067 .family = PF_INET, 1068 .owner = THIS_MODULE, 1069 .release = inet_release, 1070 .bind = inet_bind, 1071 .connect = inet_stream_connect, 1072 .socketpair = sock_no_socketpair, 1073 .accept = inet_accept, 1074 .getname = inet_getname, 1075 .poll = tcp_poll, 1076 .ioctl = inet_ioctl, 1077 .gettstamp = sock_gettstamp, 1078 .listen = inet_listen, 1079 .shutdown = inet_shutdown, 1080 .setsockopt = sock_common_setsockopt, 1081 .getsockopt = sock_common_getsockopt, 1082 .sendmsg = inet_sendmsg, 1083 .recvmsg = inet_recvmsg, 1084 #ifdef CONFIG_MMU 1085 .mmap = tcp_mmap, 1086 #endif 1087 .splice_eof = inet_splice_eof, 1088 .splice_read = tcp_splice_read, 1089 .set_peek_off = sk_set_peek_off, 1090 .read_sock = tcp_read_sock, 1091 .read_skb = tcp_read_skb, 1092 .sendmsg_locked = tcp_sendmsg_locked, 1093 .peek_len = tcp_peek_len, 1094 #ifdef CONFIG_COMPAT 1095 .compat_ioctl = inet_compat_ioctl, 1096 #endif 1097 .set_rcvlowat = tcp_set_rcvlowat, 1098 }; 1099 EXPORT_SYMBOL(inet_stream_ops); 1100 1101 const struct proto_ops inet_dgram_ops = { 1102 .family = PF_INET, 1103 .owner = THIS_MODULE, 1104 .release = inet_release, 1105 .bind = inet_bind, 1106 .connect = inet_dgram_connect, 1107 .socketpair = sock_no_socketpair, 1108 .accept = sock_no_accept, 1109 .getname = inet_getname, 1110 .poll = udp_poll, 1111 .ioctl = inet_ioctl, 1112 .gettstamp = sock_gettstamp, 1113 .listen = sock_no_listen, 1114 .shutdown = inet_shutdown, 1115 .setsockopt = sock_common_setsockopt, 1116 .getsockopt = sock_common_getsockopt, 1117 .sendmsg = inet_sendmsg, 1118 .read_skb = udp_read_skb, 1119 .recvmsg = inet_recvmsg, 1120 .mmap = sock_no_mmap, 1121 .splice_eof = inet_splice_eof, 1122 .set_peek_off = udp_set_peek_off, 1123 #ifdef CONFIG_COMPAT 1124 .compat_ioctl = inet_compat_ioctl, 1125 #endif 1126 }; 1127 EXPORT_SYMBOL(inet_dgram_ops); 1128 1129 /* 1130 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 1131 * udp_poll 1132 */ 1133 static const struct proto_ops inet_sockraw_ops = { 1134 .family = PF_INET, 1135 .owner = THIS_MODULE, 1136 .release = inet_release, 1137 .bind = inet_bind, 1138 .connect = inet_dgram_connect, 1139 .socketpair = sock_no_socketpair, 1140 .accept = sock_no_accept, 1141 .getname = inet_getname, 1142 .poll = datagram_poll, 1143 .ioctl = inet_ioctl, 1144 .gettstamp = sock_gettstamp, 1145 .listen = sock_no_listen, 1146 .shutdown = inet_shutdown, 1147 .setsockopt = sock_common_setsockopt, 1148 .getsockopt = sock_common_getsockopt, 1149 .sendmsg = inet_sendmsg, 1150 .recvmsg = inet_recvmsg, 1151 .mmap = sock_no_mmap, 1152 .splice_eof = inet_splice_eof, 1153 #ifdef CONFIG_COMPAT 1154 .compat_ioctl = inet_compat_ioctl, 1155 #endif 1156 }; 1157 1158 static const struct net_proto_family inet_family_ops = { 1159 .family = PF_INET, 1160 .create = inet_create, 1161 .owner = THIS_MODULE, 1162 }; 1163 1164 /* Upon startup we insert all the elements in inetsw_array[] into 1165 * the linked list inetsw. 1166 */ 1167 static struct inet_protosw inetsw_array[] = 1168 { 1169 { 1170 .type = SOCK_STREAM, 1171 .protocol = IPPROTO_TCP, 1172 .prot = &tcp_prot, 1173 .ops = &inet_stream_ops, 1174 .flags = INET_PROTOSW_PERMANENT | 1175 INET_PROTOSW_ICSK, 1176 }, 1177 1178 { 1179 .type = SOCK_DGRAM, 1180 .protocol = IPPROTO_UDP, 1181 .prot = &udp_prot, 1182 .ops = &inet_dgram_ops, 1183 .flags = INET_PROTOSW_PERMANENT, 1184 }, 1185 1186 { 1187 .type = SOCK_DGRAM, 1188 .protocol = IPPROTO_ICMP, 1189 .prot = &ping_prot, 1190 .ops = &inet_sockraw_ops, 1191 .flags = INET_PROTOSW_REUSE, 1192 }, 1193 1194 { 1195 .type = SOCK_RAW, 1196 .protocol = IPPROTO_IP, /* wild card */ 1197 .prot = &raw_prot, 1198 .ops = &inet_sockraw_ops, 1199 .flags = INET_PROTOSW_REUSE, 1200 } 1201 }; 1202 1203 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) 1204 1205 void inet_register_protosw(struct inet_protosw *p) 1206 { 1207 struct list_head *lh; 1208 struct inet_protosw *answer; 1209 int protocol = p->protocol; 1210 struct list_head *last_perm; 1211 1212 spin_lock_bh(&inetsw_lock); 1213 1214 if (p->type >= SOCK_MAX) 1215 goto out_illegal; 1216 1217 /* If we are trying to override a permanent protocol, bail. */ 1218 last_perm = &inetsw[p->type]; 1219 list_for_each(lh, &inetsw[p->type]) { 1220 answer = list_entry(lh, struct inet_protosw, list); 1221 /* Check only the non-wild match. */ 1222 if ((INET_PROTOSW_PERMANENT & answer->flags) == 0) 1223 break; 1224 if (protocol == answer->protocol) 1225 goto out_permanent; 1226 last_perm = lh; 1227 } 1228 1229 /* Add the new entry after the last permanent entry if any, so that 1230 * the new entry does not override a permanent entry when matched with 1231 * a wild-card protocol. But it is allowed to override any existing 1232 * non-permanent entry. This means that when we remove this entry, the 1233 * system automatically returns to the old behavior. 1234 */ 1235 list_add_rcu(&p->list, last_perm); 1236 out: 1237 spin_unlock_bh(&inetsw_lock); 1238 1239 return; 1240 1241 out_permanent: 1242 pr_err("Attempt to override permanent protocol %d\n", protocol); 1243 goto out; 1244 1245 out_illegal: 1246 pr_err("Ignoring attempt to register invalid socket type %d\n", 1247 p->type); 1248 goto out; 1249 } 1250 EXPORT_SYMBOL(inet_register_protosw); 1251 1252 void inet_unregister_protosw(struct inet_protosw *p) 1253 { 1254 if (INET_PROTOSW_PERMANENT & p->flags) { 1255 pr_err("Attempt to unregister permanent protocol %d\n", 1256 p->protocol); 1257 } else { 1258 spin_lock_bh(&inetsw_lock); 1259 list_del_rcu(&p->list); 1260 spin_unlock_bh(&inetsw_lock); 1261 1262 synchronize_net(); 1263 } 1264 } 1265 EXPORT_SYMBOL(inet_unregister_protosw); 1266 1267 static int inet_sk_reselect_saddr(struct sock *sk) 1268 { 1269 struct inet_sock *inet = inet_sk(sk); 1270 __be32 old_saddr = inet->inet_saddr; 1271 __be32 daddr = inet->inet_daddr; 1272 struct flowi4 *fl4; 1273 struct rtable *rt; 1274 __be32 new_saddr; 1275 struct ip_options_rcu *inet_opt; 1276 int err; 1277 1278 inet_opt = rcu_dereference_protected(inet->inet_opt, 1279 lockdep_sock_is_held(sk)); 1280 if (inet_opt && inet_opt->opt.srr) 1281 daddr = inet_opt->opt.faddr; 1282 1283 /* Query new route. */ 1284 fl4 = &inet->cork.fl.u.ip4; 1285 rt = ip_route_connect(fl4, daddr, 0, sk->sk_bound_dev_if, 1286 sk->sk_protocol, inet->inet_sport, 1287 inet->inet_dport, sk); 1288 if (IS_ERR(rt)) 1289 return PTR_ERR(rt); 1290 1291 new_saddr = fl4->saddr; 1292 1293 if (new_saddr == old_saddr) { 1294 sk_setup_caps(sk, &rt->dst); 1295 return 0; 1296 } 1297 1298 err = inet_bhash2_update_saddr(sk, &new_saddr, AF_INET); 1299 if (err) { 1300 ip_rt_put(rt); 1301 return err; 1302 } 1303 1304 sk_setup_caps(sk, &rt->dst); 1305 1306 if (READ_ONCE(sock_net(sk)->ipv4.sysctl_ip_dynaddr) > 1) { 1307 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n", 1308 __func__, &old_saddr, &new_saddr); 1309 } 1310 1311 /* 1312 * XXX The only one ugly spot where we need to 1313 * XXX really change the sockets identity after 1314 * XXX it has entered the hashes. -DaveM 1315 * 1316 * Besides that, it does not check for connection 1317 * uniqueness. Wait for troubles. 1318 */ 1319 return __sk_prot_rehash(sk); 1320 } 1321 1322 int inet_sk_rebuild_header(struct sock *sk) 1323 { 1324 struct rtable *rt = dst_rtable(__sk_dst_check(sk, 0)); 1325 struct inet_sock *inet = inet_sk(sk); 1326 struct flowi4 *fl4; 1327 int err; 1328 1329 /* Route is OK, nothing to do. */ 1330 if (rt) 1331 return 0; 1332 1333 /* Reroute. */ 1334 fl4 = &inet->cork.fl.u.ip4; 1335 inet_sk_init_flowi4(inet, fl4); 1336 rt = ip_route_output_flow(sock_net(sk), fl4, sk); 1337 if (!IS_ERR(rt)) { 1338 err = 0; 1339 sk_setup_caps(sk, &rt->dst); 1340 } else { 1341 err = PTR_ERR(rt); 1342 1343 /* Routing failed... */ 1344 sk->sk_route_caps = 0; 1345 1346 if (!READ_ONCE(sock_net(sk)->ipv4.sysctl_ip_dynaddr) || 1347 sk->sk_state != TCP_SYN_SENT || 1348 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 1349 (err = inet_sk_reselect_saddr(sk)) != 0) 1350 WRITE_ONCE(sk->sk_err_soft, -err); 1351 } 1352 1353 return err; 1354 } 1355 EXPORT_SYMBOL(inet_sk_rebuild_header); 1356 1357 void inet_sk_set_state(struct sock *sk, int state) 1358 { 1359 trace_inet_sock_set_state(sk, sk->sk_state, state); 1360 sk->sk_state = state; 1361 } 1362 EXPORT_SYMBOL(inet_sk_set_state); 1363 1364 void inet_sk_state_store(struct sock *sk, int newstate) 1365 { 1366 trace_inet_sock_set_state(sk, sk->sk_state, newstate); 1367 smp_store_release(&sk->sk_state, newstate); 1368 } 1369 1370 struct sk_buff *inet_gso_segment(struct sk_buff *skb, 1371 netdev_features_t features) 1372 { 1373 bool udpfrag = false, fixedid = false, gso_partial, encap; 1374 struct sk_buff *segs = ERR_PTR(-EINVAL); 1375 const struct net_offload *ops; 1376 unsigned int offset = 0; 1377 struct iphdr *iph; 1378 int proto, tot_len; 1379 int nhoff; 1380 int ihl; 1381 int id; 1382 1383 skb_reset_network_header(skb); 1384 nhoff = skb_network_header(skb) - skb_mac_header(skb); 1385 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1386 goto out; 1387 1388 iph = ip_hdr(skb); 1389 ihl = iph->ihl * 4; 1390 if (ihl < sizeof(*iph)) 1391 goto out; 1392 1393 id = ntohs(iph->id); 1394 proto = iph->protocol; 1395 1396 /* Warning: after this point, iph might be no longer valid */ 1397 if (unlikely(!pskb_may_pull(skb, ihl))) 1398 goto out; 1399 __skb_pull(skb, ihl); 1400 1401 encap = SKB_GSO_CB(skb)->encap_level > 0; 1402 if (encap) 1403 features &= skb->dev->hw_enc_features; 1404 SKB_GSO_CB(skb)->encap_level += ihl; 1405 1406 skb_reset_transport_header(skb); 1407 1408 segs = ERR_PTR(-EPROTONOSUPPORT); 1409 1410 fixedid = !!(skb_shinfo(skb)->gso_type & (SKB_GSO_TCP_FIXEDID << encap)); 1411 1412 if (!skb->encapsulation || encap) 1413 udpfrag = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP); 1414 1415 ops = rcu_dereference(inet_offloads[proto]); 1416 if (likely(ops && ops->callbacks.gso_segment)) { 1417 segs = ops->callbacks.gso_segment(skb, features); 1418 if (!segs) 1419 skb->network_header = skb_mac_header(skb) + nhoff - skb->head; 1420 } 1421 1422 if (IS_ERR_OR_NULL(segs)) 1423 goto out; 1424 1425 gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL); 1426 1427 skb = segs; 1428 do { 1429 iph = (struct iphdr *)(skb_mac_header(skb) + nhoff); 1430 if (udpfrag) { 1431 iph->frag_off = htons(offset >> 3); 1432 if (skb->next) 1433 iph->frag_off |= htons(IP_MF); 1434 offset += skb->len - nhoff - ihl; 1435 tot_len = skb->len - nhoff; 1436 } else if (skb_is_gso(skb)) { 1437 if (!fixedid) { 1438 iph->id = htons(id); 1439 id += skb_shinfo(skb)->gso_segs; 1440 } 1441 1442 if (gso_partial) 1443 tot_len = skb_shinfo(skb)->gso_size + 1444 SKB_GSO_CB(skb)->data_offset + 1445 skb->head - (unsigned char *)iph; 1446 else 1447 tot_len = skb->len - nhoff; 1448 } else { 1449 if (!fixedid) 1450 iph->id = htons(id++); 1451 tot_len = skb->len - nhoff; 1452 } 1453 iph->tot_len = htons(tot_len); 1454 ip_send_check(iph); 1455 if (encap) 1456 skb_reset_inner_headers(skb); 1457 skb->network_header = (u8 *)iph - skb->head; 1458 skb_reset_mac_len(skb); 1459 } while ((skb = skb->next)); 1460 1461 out: 1462 return segs; 1463 } 1464 1465 static struct sk_buff *ipip_gso_segment(struct sk_buff *skb, 1466 netdev_features_t features) 1467 { 1468 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_IPXIP4)) 1469 return ERR_PTR(-EINVAL); 1470 1471 return inet_gso_segment(skb, features); 1472 } 1473 1474 struct sk_buff *inet_gro_receive(struct list_head *head, struct sk_buff *skb) 1475 { 1476 const struct net_offload *ops; 1477 struct sk_buff *pp = NULL; 1478 const struct iphdr *iph; 1479 struct sk_buff *p; 1480 unsigned int hlen; 1481 unsigned int off; 1482 int flush = 1; 1483 int proto; 1484 1485 off = skb_gro_offset(skb); 1486 hlen = off + sizeof(*iph); 1487 iph = skb_gro_header(skb, hlen, off); 1488 if (unlikely(!iph)) 1489 goto out; 1490 1491 proto = iph->protocol; 1492 1493 ops = rcu_dereference(inet_offloads[proto]); 1494 if (!ops || !ops->callbacks.gro_receive) 1495 goto out; 1496 1497 if (*(u8 *)iph != 0x45) 1498 goto out; 1499 1500 if (ip_is_fragment(iph)) 1501 goto out; 1502 1503 if (unlikely(ip_fast_csum((u8 *)iph, 5))) 1504 goto out; 1505 1506 NAPI_GRO_CB(skb)->proto = proto; 1507 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (ntohl(*(__be32 *)&iph->id) & ~IP_DF)); 1508 1509 list_for_each_entry(p, head, list) { 1510 struct iphdr *iph2; 1511 1512 if (!NAPI_GRO_CB(p)->same_flow) 1513 continue; 1514 1515 iph2 = (struct iphdr *)(p->data + off); 1516 /* The above works because, with the exception of the top 1517 * (inner most) layer, we only aggregate pkts with the same 1518 * hdr length so all the hdrs we'll need to verify will start 1519 * at the same offset. 1520 */ 1521 if ((iph->protocol ^ iph2->protocol) | 1522 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) | 1523 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) { 1524 NAPI_GRO_CB(p)->same_flow = 0; 1525 continue; 1526 } 1527 } 1528 1529 NAPI_GRO_CB(skb)->flush |= flush; 1530 NAPI_GRO_CB(skb)->network_offsets[NAPI_GRO_CB(skb)->encap_mark] = off; 1531 1532 /* Note : No need to call skb_gro_postpull_rcsum() here, 1533 * as we already checked checksum over ipv4 header was 0 1534 */ 1535 skb_gro_pull(skb, sizeof(*iph)); 1536 skb_set_transport_header(skb, skb_gro_offset(skb)); 1537 1538 pp = indirect_call_gro_receive(tcp4_gro_receive, udp4_gro_receive, 1539 ops->callbacks.gro_receive, head, skb); 1540 1541 out: 1542 skb_gro_flush_final(skb, pp, flush); 1543 1544 return pp; 1545 } 1546 1547 static struct sk_buff *ipip_gro_receive(struct list_head *head, 1548 struct sk_buff *skb) 1549 { 1550 if (NAPI_GRO_CB(skb)->encap_mark) { 1551 NAPI_GRO_CB(skb)->flush = 1; 1552 return NULL; 1553 } 1554 1555 NAPI_GRO_CB(skb)->encap_mark = 1; 1556 1557 return inet_gro_receive(head, skb); 1558 } 1559 1560 #define SECONDS_PER_DAY 86400 1561 1562 /* inet_current_timestamp - Return IP network timestamp 1563 * 1564 * Return milliseconds since midnight in network byte order. 1565 */ 1566 __be32 inet_current_timestamp(void) 1567 { 1568 u32 secs; 1569 u32 msecs; 1570 struct timespec64 ts; 1571 1572 ktime_get_real_ts64(&ts); 1573 1574 /* Get secs since midnight. */ 1575 (void)div_u64_rem(ts.tv_sec, SECONDS_PER_DAY, &secs); 1576 /* Convert to msecs. */ 1577 msecs = secs * MSEC_PER_SEC; 1578 /* Convert nsec to msec. */ 1579 msecs += (u32)ts.tv_nsec / NSEC_PER_MSEC; 1580 1581 /* Convert to network byte order. */ 1582 return htonl(msecs); 1583 } 1584 EXPORT_SYMBOL(inet_current_timestamp); 1585 1586 int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 1587 { 1588 unsigned int family = READ_ONCE(sk->sk_family); 1589 1590 if (family == AF_INET) 1591 return ip_recv_error(sk, msg, len, addr_len); 1592 #if IS_ENABLED(CONFIG_IPV6) 1593 if (family == AF_INET6) 1594 return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len); 1595 #endif 1596 return -EINVAL; 1597 } 1598 EXPORT_SYMBOL(inet_recv_error); 1599 1600 int inet_gro_complete(struct sk_buff *skb, int nhoff) 1601 { 1602 struct iphdr *iph = (struct iphdr *)(skb->data + nhoff); 1603 const struct net_offload *ops; 1604 __be16 totlen = iph->tot_len; 1605 int proto = iph->protocol; 1606 int err = -ENOSYS; 1607 1608 if (skb->encapsulation) { 1609 skb_set_inner_protocol(skb, cpu_to_be16(ETH_P_IP)); 1610 skb_set_inner_network_header(skb, nhoff); 1611 } 1612 1613 iph_set_totlen(iph, skb->len - nhoff); 1614 csum_replace2(&iph->check, totlen, iph->tot_len); 1615 1616 ops = rcu_dereference(inet_offloads[proto]); 1617 if (WARN_ON(!ops || !ops->callbacks.gro_complete)) 1618 goto out; 1619 1620 /* Only need to add sizeof(*iph) to get to the next hdr below 1621 * because any hdr with option will have been flushed in 1622 * inet_gro_receive(). 1623 */ 1624 err = INDIRECT_CALL_2(ops->callbacks.gro_complete, 1625 tcp4_gro_complete, udp4_gro_complete, 1626 skb, nhoff + sizeof(*iph)); 1627 1628 out: 1629 return err; 1630 } 1631 1632 static int ipip_gro_complete(struct sk_buff *skb, int nhoff) 1633 { 1634 skb->encapsulation = 1; 1635 skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4; 1636 return inet_gro_complete(skb, nhoff); 1637 } 1638 1639 int inet_ctl_sock_create(struct sock **sk, unsigned short family, 1640 unsigned short type, unsigned char protocol, 1641 struct net *net) 1642 { 1643 struct socket *sock; 1644 int rc = sock_create_kern(net, family, type, protocol, &sock); 1645 1646 if (rc == 0) { 1647 *sk = sock->sk; 1648 (*sk)->sk_allocation = GFP_ATOMIC; 1649 (*sk)->sk_use_task_frag = false; 1650 /* 1651 * Unhash it so that IP input processing does not even see it, 1652 * we do not wish this socket to see incoming packets. 1653 */ 1654 (*sk)->sk_prot->unhash(*sk); 1655 } 1656 return rc; 1657 } 1658 EXPORT_SYMBOL_GPL(inet_ctl_sock_create); 1659 1660 unsigned long snmp_fold_field(void __percpu *mib, int offt) 1661 { 1662 unsigned long res = 0; 1663 int i; 1664 1665 for_each_possible_cpu(i) 1666 res += snmp_get_cpu_field(mib, i, offt); 1667 return res; 1668 } 1669 EXPORT_SYMBOL_GPL(snmp_fold_field); 1670 1671 #if BITS_PER_LONG==32 1672 1673 u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offt, 1674 size_t syncp_offset) 1675 { 1676 void *bhptr; 1677 struct u64_stats_sync *syncp; 1678 u64 v; 1679 unsigned int start; 1680 1681 bhptr = per_cpu_ptr(mib, cpu); 1682 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset); 1683 do { 1684 start = u64_stats_fetch_begin(syncp); 1685 v = *(((u64 *)bhptr) + offt); 1686 } while (u64_stats_fetch_retry(syncp, start)); 1687 1688 return v; 1689 } 1690 EXPORT_SYMBOL_GPL(snmp_get_cpu_field64); 1691 1692 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset) 1693 { 1694 u64 res = 0; 1695 int cpu; 1696 1697 for_each_possible_cpu(cpu) { 1698 res += snmp_get_cpu_field64(mib, cpu, offt, syncp_offset); 1699 } 1700 return res; 1701 } 1702 EXPORT_SYMBOL_GPL(snmp_fold_field64); 1703 #endif 1704 1705 #ifdef CONFIG_IP_MULTICAST 1706 static const struct net_protocol igmp_protocol = { 1707 .handler = igmp_rcv, 1708 }; 1709 #endif 1710 1711 static const struct net_protocol icmp_protocol = { 1712 .handler = icmp_rcv, 1713 .err_handler = icmp_err, 1714 .no_policy = 1, 1715 }; 1716 1717 static __net_init int ipv4_mib_init_net(struct net *net) 1718 { 1719 int i; 1720 1721 net->mib.tcp_statistics = alloc_percpu(struct tcp_mib); 1722 if (!net->mib.tcp_statistics) 1723 goto err_tcp_mib; 1724 net->mib.ip_statistics = alloc_percpu(struct ipstats_mib); 1725 if (!net->mib.ip_statistics) 1726 goto err_ip_mib; 1727 1728 for_each_possible_cpu(i) { 1729 struct ipstats_mib *af_inet_stats; 1730 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i); 1731 u64_stats_init(&af_inet_stats->syncp); 1732 } 1733 1734 net->mib.net_statistics = alloc_percpu(struct linux_mib); 1735 if (!net->mib.net_statistics) 1736 goto err_net_mib; 1737 net->mib.udp_statistics = alloc_percpu(struct udp_mib); 1738 if (!net->mib.udp_statistics) 1739 goto err_udp_mib; 1740 net->mib.udplite_statistics = alloc_percpu(struct udp_mib); 1741 if (!net->mib.udplite_statistics) 1742 goto err_udplite_mib; 1743 net->mib.icmp_statistics = alloc_percpu(struct icmp_mib); 1744 if (!net->mib.icmp_statistics) 1745 goto err_icmp_mib; 1746 net->mib.icmpmsg_statistics = kzalloc_obj(struct icmpmsg_mib); 1747 if (!net->mib.icmpmsg_statistics) 1748 goto err_icmpmsg_mib; 1749 1750 tcp_mib_init(net); 1751 return 0; 1752 1753 err_icmpmsg_mib: 1754 free_percpu(net->mib.icmp_statistics); 1755 err_icmp_mib: 1756 free_percpu(net->mib.udplite_statistics); 1757 err_udplite_mib: 1758 free_percpu(net->mib.udp_statistics); 1759 err_udp_mib: 1760 free_percpu(net->mib.net_statistics); 1761 err_net_mib: 1762 free_percpu(net->mib.ip_statistics); 1763 err_ip_mib: 1764 free_percpu(net->mib.tcp_statistics); 1765 err_tcp_mib: 1766 return -ENOMEM; 1767 } 1768 1769 static __net_exit void ipv4_mib_exit_net(struct net *net) 1770 { 1771 kfree(net->mib.icmpmsg_statistics); 1772 free_percpu(net->mib.icmp_statistics); 1773 free_percpu(net->mib.udplite_statistics); 1774 free_percpu(net->mib.udp_statistics); 1775 free_percpu(net->mib.net_statistics); 1776 free_percpu(net->mib.ip_statistics); 1777 free_percpu(net->mib.tcp_statistics); 1778 #ifdef CONFIG_MPTCP 1779 /* allocated on demand, see mptcp_init_sock() */ 1780 free_percpu(net->mib.mptcp_statistics); 1781 #endif 1782 } 1783 1784 static __net_initdata struct pernet_operations ipv4_mib_ops = { 1785 .init = ipv4_mib_init_net, 1786 .exit = ipv4_mib_exit_net, 1787 }; 1788 1789 static int __init init_ipv4_mibs(void) 1790 { 1791 return register_pernet_subsys(&ipv4_mib_ops); 1792 } 1793 1794 static __net_init int inet_init_net(struct net *net) 1795 { 1796 /* 1797 * Set defaults for local port range 1798 */ 1799 net->ipv4.ip_local_ports.range = 60999u << 16 | 32768u; 1800 1801 seqlock_init(&net->ipv4.ping_group_range.lock); 1802 /* 1803 * Sane defaults - nobody may create ping sockets. 1804 * Boot scripts should set this to distro-specific group. 1805 */ 1806 net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1); 1807 net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0); 1808 1809 /* Default values for sysctl-controlled parameters. 1810 * We set them here, in case sysctl is not compiled. 1811 */ 1812 net->ipv4.sysctl_ip_default_ttl = IPDEFTTL; 1813 net->ipv4.sysctl_ip_fwd_update_priority = 1; 1814 net->ipv4.sysctl_ip_dynaddr = 0; 1815 net->ipv4.sysctl_ip_early_demux = 1; 1816 net->ipv4.sysctl_udp_early_demux = 1; 1817 net->ipv4.sysctl_tcp_early_demux = 1; 1818 net->ipv4.sysctl_nexthop_compat_mode = 1; 1819 #ifdef CONFIG_SYSCTL 1820 net->ipv4.sysctl_ip_prot_sock = PROT_SOCK; 1821 #endif 1822 1823 /* Some igmp sysctl, whose values are always used */ 1824 net->ipv4.sysctl_igmp_max_memberships = 20; 1825 net->ipv4.sysctl_igmp_max_msf = 10; 1826 /* IGMP reports for link-local multicast groups are enabled by default */ 1827 net->ipv4.sysctl_igmp_llm_reports = 1; 1828 net->ipv4.sysctl_igmp_qrv = 2; 1829 1830 net->ipv4.sysctl_fib_notify_on_flag_change = 0; 1831 1832 return 0; 1833 } 1834 1835 static __net_initdata struct pernet_operations af_inet_ops = { 1836 .init = inet_init_net, 1837 }; 1838 1839 static int __init init_inet_pernet_ops(void) 1840 { 1841 return register_pernet_subsys(&af_inet_ops); 1842 } 1843 1844 static int ipv4_proc_init(void); 1845 1846 /* 1847 * IP protocol layer initialiser 1848 */ 1849 1850 1851 static const struct net_offload ipip_offload = { 1852 .callbacks = { 1853 .gso_segment = ipip_gso_segment, 1854 .gro_receive = ipip_gro_receive, 1855 .gro_complete = ipip_gro_complete, 1856 }, 1857 }; 1858 1859 static int __init ipip_offload_init(void) 1860 { 1861 return inet_add_offload(&ipip_offload, IPPROTO_IPIP); 1862 } 1863 1864 static int __init ipv4_offload_init(void) 1865 { 1866 /* 1867 * Add offloads 1868 */ 1869 if (udpv4_offload_init() < 0) 1870 pr_crit("%s: Cannot add UDP protocol offload\n", __func__); 1871 if (tcpv4_offload_init() < 0) 1872 pr_crit("%s: Cannot add TCP protocol offload\n", __func__); 1873 if (ipip_offload_init() < 0) 1874 pr_crit("%s: Cannot add IPIP protocol offload\n", __func__); 1875 1876 net_hotdata.ip_packet_offload = (struct packet_offload) { 1877 .type = cpu_to_be16(ETH_P_IP), 1878 .callbacks = { 1879 .gso_segment = inet_gso_segment, 1880 .gro_receive = inet_gro_receive, 1881 .gro_complete = inet_gro_complete, 1882 }, 1883 }; 1884 dev_add_offload(&net_hotdata.ip_packet_offload); 1885 return 0; 1886 } 1887 1888 fs_initcall(ipv4_offload_init); 1889 1890 static struct packet_type ip_packet_type __read_mostly = { 1891 .type = cpu_to_be16(ETH_P_IP), 1892 .func = ip_rcv, 1893 .list_func = ip_list_rcv, 1894 }; 1895 1896 static int __init inet_init(void) 1897 { 1898 struct inet_protosw *q; 1899 struct list_head *r; 1900 int rc; 1901 1902 sock_skb_cb_check_size(sizeof(struct inet_skb_parm)); 1903 1904 raw_hashinfo_init(&raw_v4_hashinfo); 1905 1906 rc = proto_register(&tcp_prot, 1); 1907 if (rc) 1908 goto out; 1909 1910 rc = proto_register(&udp_prot, 1); 1911 if (rc) 1912 goto out_unregister_tcp_proto; 1913 1914 rc = proto_register(&raw_prot, 1); 1915 if (rc) 1916 goto out_unregister_udp_proto; 1917 1918 rc = proto_register(&ping_prot, 1); 1919 if (rc) 1920 goto out_unregister_raw_proto; 1921 1922 /* 1923 * Tell SOCKET that we are alive... 1924 */ 1925 1926 (void)sock_register(&inet_family_ops); 1927 1928 #ifdef CONFIG_SYSCTL 1929 ip_static_sysctl_init(); 1930 #endif 1931 1932 /* 1933 * Add all the base protocols. 1934 */ 1935 1936 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 1937 pr_crit("%s: Cannot add ICMP protocol\n", __func__); 1938 1939 net_hotdata.udp_protocol = (struct net_protocol) { 1940 .handler = udp_rcv, 1941 .err_handler = udp_err, 1942 .no_policy = 1, 1943 }; 1944 if (inet_add_protocol(&net_hotdata.udp_protocol, IPPROTO_UDP) < 0) 1945 pr_crit("%s: Cannot add UDP protocol\n", __func__); 1946 1947 net_hotdata.tcp_protocol = (struct net_protocol) { 1948 .handler = tcp_v4_rcv, 1949 .err_handler = tcp_v4_err, 1950 .no_policy = 1, 1951 .icmp_strict_tag_validation = 1, 1952 }; 1953 if (inet_add_protocol(&net_hotdata.tcp_protocol, IPPROTO_TCP) < 0) 1954 pr_crit("%s: Cannot add TCP protocol\n", __func__); 1955 #ifdef CONFIG_IP_MULTICAST 1956 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 1957 pr_crit("%s: Cannot add IGMP protocol\n", __func__); 1958 #endif 1959 1960 /* Register the socket-side information for inet_create. */ 1961 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 1962 INIT_LIST_HEAD(r); 1963 1964 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 1965 inet_register_protosw(q); 1966 1967 /* 1968 * Set the ARP module up 1969 */ 1970 1971 arp_init(); 1972 1973 /* 1974 * Set the IP module up 1975 */ 1976 1977 ip_init(); 1978 1979 /* Initialise per-cpu ipv4 mibs */ 1980 if (init_ipv4_mibs()) 1981 panic("%s: Cannot init ipv4 mibs\n", __func__); 1982 1983 /* Setup TCP slab cache for open requests. */ 1984 tcp_init(); 1985 1986 /* Setup UDP memory threshold */ 1987 udp_init(); 1988 1989 /* Add UDP-Lite (RFC 3828) */ 1990 udplite4_register(); 1991 1992 raw_init(); 1993 1994 ping_init(); 1995 1996 /* 1997 * Set the ICMP layer up 1998 */ 1999 2000 if (icmp_init() < 0) 2001 panic("Failed to create the ICMP control socket.\n"); 2002 2003 /* 2004 * Initialise the multicast router 2005 */ 2006 #if defined(CONFIG_IP_MROUTE) 2007 if (ip_mr_init()) 2008 pr_crit("%s: Cannot init ipv4 mroute\n", __func__); 2009 #endif 2010 2011 if (init_inet_pernet_ops()) 2012 pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__); 2013 2014 ipv4_proc_init(); 2015 2016 ipfrag_init(); 2017 2018 dev_add_pack(&ip_packet_type); 2019 2020 ip_tunnel_core_init(); 2021 2022 rc = 0; 2023 out: 2024 return rc; 2025 out_unregister_raw_proto: 2026 proto_unregister(&raw_prot); 2027 out_unregister_udp_proto: 2028 proto_unregister(&udp_prot); 2029 out_unregister_tcp_proto: 2030 proto_unregister(&tcp_prot); 2031 goto out; 2032 } 2033 2034 fs_initcall(inet_init); 2035 2036 /* ------------------------------------------------------------------------ */ 2037 2038 #ifdef CONFIG_PROC_FS 2039 static int __init ipv4_proc_init(void) 2040 { 2041 int rc = 0; 2042 2043 if (raw_proc_init()) 2044 goto out_raw; 2045 if (tcp4_proc_init()) 2046 goto out_tcp; 2047 if (udp4_proc_init()) 2048 goto out_udp; 2049 if (ping_proc_init()) 2050 goto out_ping; 2051 if (ip_misc_proc_init()) 2052 goto out_misc; 2053 out: 2054 return rc; 2055 out_misc: 2056 ping_proc_exit(); 2057 out_ping: 2058 udp4_proc_exit(); 2059 out_udp: 2060 tcp4_proc_exit(); 2061 out_tcp: 2062 raw_proc_exit(); 2063 out_raw: 2064 rc = -ENOMEM; 2065 goto out; 2066 } 2067 2068 #else /* CONFIG_PROC_FS */ 2069 static int __init ipv4_proc_init(void) 2070 { 2071 return 0; 2072 } 2073 #endif /* CONFIG_PROC_FS */ 2074