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