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/tcp.h> 103 #include <net/udp.h> 104 #include <net/udplite.h> 105 #include <net/ping.h> 106 #include <linux/skbuff.h> 107 #include <net/sock.h> 108 #include <net/raw.h> 109 #include <net/icmp.h> 110 #include <net/inet_common.h> 111 #include <net/ip_tunnels.h> 112 #include <net/xfrm.h> 113 #include <net/net_namespace.h> 114 #include <net/secure_seq.h> 115 #ifdef CONFIG_IP_MROUTE 116 #include <linux/mroute.h> 117 #endif 118 #include <net/l3mdev.h> 119 120 #include <trace/events/sock.h> 121 122 /* The inetsw table contains everything that inet_create needs to 123 * build a new socket. 124 */ 125 static struct list_head inetsw[SOCK_MAX]; 126 static DEFINE_SPINLOCK(inetsw_lock); 127 128 /* New destruction routine */ 129 130 void inet_sock_destruct(struct sock *sk) 131 { 132 struct inet_sock *inet = inet_sk(sk); 133 134 __skb_queue_purge(&sk->sk_receive_queue); 135 if (sk->sk_rx_skb_cache) { 136 __kfree_skb(sk->sk_rx_skb_cache); 137 sk->sk_rx_skb_cache = NULL; 138 } 139 __skb_queue_purge(&sk->sk_error_queue); 140 141 sk_mem_reclaim(sk); 142 143 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) { 144 pr_err("Attempt to release TCP socket in state %d %p\n", 145 sk->sk_state, sk); 146 return; 147 } 148 if (!sock_flag(sk, SOCK_DEAD)) { 149 pr_err("Attempt to release alive inet socket %p\n", sk); 150 return; 151 } 152 153 WARN_ON(atomic_read(&sk->sk_rmem_alloc)); 154 WARN_ON(refcount_read(&sk->sk_wmem_alloc)); 155 WARN_ON(sk->sk_wmem_queued); 156 WARN_ON(sk->sk_forward_alloc); 157 158 kfree(rcu_dereference_protected(inet->inet_opt, 1)); 159 dst_release(rcu_dereference_protected(sk->sk_dst_cache, 1)); 160 dst_release(sk->sk_rx_dst); 161 sk_refcnt_debug_dec(sk); 162 } 163 EXPORT_SYMBOL(inet_sock_destruct); 164 165 /* 166 * The routines beyond this point handle the behaviour of an AF_INET 167 * socket object. Mostly it punts to the subprotocols of IP to do 168 * the work. 169 */ 170 171 /* 172 * Automatically bind an unbound socket. 173 */ 174 175 static int inet_autobind(struct sock *sk) 176 { 177 struct inet_sock *inet; 178 /* We may need to bind the socket. */ 179 lock_sock(sk); 180 inet = inet_sk(sk); 181 if (!inet->inet_num) { 182 if (sk->sk_prot->get_port(sk, 0)) { 183 release_sock(sk); 184 return -EAGAIN; 185 } 186 inet->inet_sport = htons(inet->inet_num); 187 } 188 release_sock(sk); 189 return 0; 190 } 191 192 /* 193 * Move a socket into listening state. 194 */ 195 int inet_listen(struct socket *sock, int backlog) 196 { 197 struct sock *sk = sock->sk; 198 unsigned char old_state; 199 int err, tcp_fastopen; 200 201 lock_sock(sk); 202 203 err = -EINVAL; 204 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM) 205 goto out; 206 207 old_state = sk->sk_state; 208 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN))) 209 goto out; 210 211 WRITE_ONCE(sk->sk_max_ack_backlog, backlog); 212 /* Really, if the socket is already in listen state 213 * we can only allow the backlog to be adjusted. 214 */ 215 if (old_state != TCP_LISTEN) { 216 /* Enable TFO w/o requiring TCP_FASTOPEN socket option. 217 * Note that only TCP sockets (SOCK_STREAM) will reach here. 218 * Also fastopen backlog may already been set via the option 219 * because the socket was in TCP_LISTEN state previously but 220 * was shutdown() rather than close(). 221 */ 222 tcp_fastopen = sock_net(sk)->ipv4.sysctl_tcp_fastopen; 223 if ((tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) && 224 (tcp_fastopen & TFO_SERVER_ENABLE) && 225 !inet_csk(sk)->icsk_accept_queue.fastopenq.max_qlen) { 226 fastopen_queue_tune(sk, backlog); 227 tcp_fastopen_init_key_once(sock_net(sk)); 228 } 229 230 err = inet_csk_listen_start(sk, backlog); 231 if (err) 232 goto out; 233 tcp_call_bpf(sk, BPF_SOCK_OPS_TCP_LISTEN_CB, 0, NULL); 234 } 235 err = 0; 236 237 out: 238 release_sock(sk); 239 return err; 240 } 241 EXPORT_SYMBOL(inet_listen); 242 243 /* 244 * Create an inet socket. 245 */ 246 247 static int inet_create(struct net *net, struct socket *sock, int protocol, 248 int kern) 249 { 250 struct sock *sk; 251 struct inet_protosw *answer; 252 struct inet_sock *inet; 253 struct proto *answer_prot; 254 unsigned char answer_flags; 255 int try_loading_module = 0; 256 int err; 257 258 if (protocol < 0 || protocol >= IPPROTO_MAX) 259 return -EINVAL; 260 261 sock->state = SS_UNCONNECTED; 262 263 /* Look for the requested type/protocol pair. */ 264 lookup_protocol: 265 err = -ESOCKTNOSUPPORT; 266 rcu_read_lock(); 267 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) { 268 269 err = 0; 270 /* Check the non-wild match. */ 271 if (protocol == answer->protocol) { 272 if (protocol != IPPROTO_IP) 273 break; 274 } else { 275 /* Check for the two wild cases. */ 276 if (IPPROTO_IP == protocol) { 277 protocol = answer->protocol; 278 break; 279 } 280 if (IPPROTO_IP == answer->protocol) 281 break; 282 } 283 err = -EPROTONOSUPPORT; 284 } 285 286 if (unlikely(err)) { 287 if (try_loading_module < 2) { 288 rcu_read_unlock(); 289 /* 290 * Be more specific, e.g. net-pf-2-proto-132-type-1 291 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) 292 */ 293 if (++try_loading_module == 1) 294 request_module("net-pf-%d-proto-%d-type-%d", 295 PF_INET, protocol, sock->type); 296 /* 297 * Fall back to generic, e.g. net-pf-2-proto-132 298 * (net-pf-PF_INET-proto-IPPROTO_SCTP) 299 */ 300 else 301 request_module("net-pf-%d-proto-%d", 302 PF_INET, protocol); 303 goto lookup_protocol; 304 } else 305 goto out_rcu_unlock; 306 } 307 308 err = -EPERM; 309 if (sock->type == SOCK_RAW && !kern && 310 !ns_capable(net->user_ns, CAP_NET_RAW)) 311 goto out_rcu_unlock; 312 313 sock->ops = answer->ops; 314 answer_prot = answer->prot; 315 answer_flags = answer->flags; 316 rcu_read_unlock(); 317 318 WARN_ON(!answer_prot->slab); 319 320 err = -ENOBUFS; 321 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot, kern); 322 if (!sk) 323 goto out; 324 325 err = 0; 326 if (INET_PROTOSW_REUSE & answer_flags) 327 sk->sk_reuse = SK_CAN_REUSE; 328 329 inet = inet_sk(sk); 330 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 331 332 inet->nodefrag = 0; 333 334 if (SOCK_RAW == sock->type) { 335 inet->inet_num = protocol; 336 if (IPPROTO_RAW == protocol) 337 inet->hdrincl = 1; 338 } 339 340 if (net->ipv4.sysctl_ip_no_pmtu_disc) 341 inet->pmtudisc = IP_PMTUDISC_DONT; 342 else 343 inet->pmtudisc = IP_PMTUDISC_WANT; 344 345 inet->inet_id = 0; 346 347 sock_init_data(sock, sk); 348 349 sk->sk_destruct = inet_sock_destruct; 350 sk->sk_protocol = protocol; 351 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 352 353 inet->uc_ttl = -1; 354 inet->mc_loop = 1; 355 inet->mc_ttl = 1; 356 inet->mc_all = 1; 357 inet->mc_index = 0; 358 inet->mc_list = NULL; 359 inet->rcv_tos = 0; 360 361 sk_refcnt_debug_inc(sk); 362 363 if (inet->inet_num) { 364 /* It assumes that any protocol which allows 365 * the user to assign a number at socket 366 * creation time automatically 367 * shares. 368 */ 369 inet->inet_sport = htons(inet->inet_num); 370 /* Add to protocol hash chains. */ 371 err = sk->sk_prot->hash(sk); 372 if (err) { 373 sk_common_release(sk); 374 goto out; 375 } 376 } 377 378 if (sk->sk_prot->init) { 379 err = sk->sk_prot->init(sk); 380 if (err) { 381 sk_common_release(sk); 382 goto out; 383 } 384 } 385 386 if (!kern) { 387 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk); 388 if (err) { 389 sk_common_release(sk); 390 goto out; 391 } 392 } 393 out: 394 return err; 395 out_rcu_unlock: 396 rcu_read_unlock(); 397 goto out; 398 } 399 400 401 /* 402 * The peer socket should always be NULL (or else). When we call this 403 * function we are destroying the object and from then on nobody 404 * should refer to it. 405 */ 406 int inet_release(struct socket *sock) 407 { 408 struct sock *sk = sock->sk; 409 410 if (sk) { 411 long timeout; 412 413 /* Applications forget to leave groups before exiting */ 414 ip_mc_drop_socket(sk); 415 416 /* If linger is set, we don't return until the close 417 * is complete. Otherwise we return immediately. The 418 * actually closing is done the same either way. 419 * 420 * If the close is due to the process exiting, we never 421 * linger.. 422 */ 423 timeout = 0; 424 if (sock_flag(sk, SOCK_LINGER) && 425 !(current->flags & PF_EXITING)) 426 timeout = sk->sk_lingertime; 427 sk->sk_prot->close(sk, timeout); 428 sock->sk = NULL; 429 } 430 return 0; 431 } 432 EXPORT_SYMBOL(inet_release); 433 434 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 435 { 436 struct sock *sk = sock->sk; 437 int err; 438 439 /* If the socket has its own bind function then use it. (RAW) */ 440 if (sk->sk_prot->bind) { 441 return sk->sk_prot->bind(sk, uaddr, addr_len); 442 } 443 if (addr_len < sizeof(struct sockaddr_in)) 444 return -EINVAL; 445 446 /* BPF prog is run before any checks are done so that if the prog 447 * changes context in a wrong way it will be caught. 448 */ 449 err = BPF_CGROUP_RUN_PROG_INET4_BIND(sk, uaddr); 450 if (err) 451 return err; 452 453 return __inet_bind(sk, uaddr, addr_len, BIND_WITH_LOCK); 454 } 455 EXPORT_SYMBOL(inet_bind); 456 457 int __inet_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len, 458 u32 flags) 459 { 460 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 461 struct inet_sock *inet = inet_sk(sk); 462 struct net *net = sock_net(sk); 463 unsigned short snum; 464 int chk_addr_ret; 465 u32 tb_id = RT_TABLE_LOCAL; 466 int err; 467 468 if (addr->sin_family != AF_INET) { 469 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET) 470 * only if s_addr is INADDR_ANY. 471 */ 472 err = -EAFNOSUPPORT; 473 if (addr->sin_family != AF_UNSPEC || 474 addr->sin_addr.s_addr != htonl(INADDR_ANY)) 475 goto out; 476 } 477 478 tb_id = l3mdev_fib_table_by_index(net, sk->sk_bound_dev_if) ? : tb_id; 479 chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id); 480 481 /* Not specified by any standard per-se, however it breaks too 482 * many applications when removed. It is unfortunate since 483 * allowing applications to make a non-local bind solves 484 * several problems with systems using dynamic addressing. 485 * (ie. your servers still start up even if your ISDN link 486 * is temporarily down) 487 */ 488 err = -EADDRNOTAVAIL; 489 if (!inet_can_nonlocal_bind(net, inet) && 490 addr->sin_addr.s_addr != htonl(INADDR_ANY) && 491 chk_addr_ret != RTN_LOCAL && 492 chk_addr_ret != RTN_MULTICAST && 493 chk_addr_ret != RTN_BROADCAST) 494 goto out; 495 496 snum = ntohs(addr->sin_port); 497 err = -EACCES; 498 if (snum && inet_port_requires_bind_service(net, snum) && 499 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 500 goto out; 501 502 /* We keep a pair of addresses. rcv_saddr is the one 503 * used by hash lookups, and saddr is used for transmit. 504 * 505 * In the BSD API these are the same except where it 506 * would be illegal to use them (multicast/broadcast) in 507 * which case the sending device address is used. 508 */ 509 if (flags & BIND_WITH_LOCK) 510 lock_sock(sk); 511 512 /* Check these errors (active socket, double bind). */ 513 err = -EINVAL; 514 if (sk->sk_state != TCP_CLOSE || inet->inet_num) 515 goto out_release_sock; 516 517 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 518 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 519 inet->inet_saddr = 0; /* Use device */ 520 521 /* Make sure we are allowed to bind here. */ 522 if (snum || !(inet->bind_address_no_port || 523 (flags & BIND_FORCE_ADDRESS_NO_PORT))) { 524 if (sk->sk_prot->get_port(sk, snum)) { 525 inet->inet_saddr = inet->inet_rcv_saddr = 0; 526 err = -EADDRINUSE; 527 goto out_release_sock; 528 } 529 if (!(flags & BIND_FROM_BPF)) { 530 err = BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk); 531 if (err) { 532 inet->inet_saddr = inet->inet_rcv_saddr = 0; 533 goto out_release_sock; 534 } 535 } 536 } 537 538 if (inet->inet_rcv_saddr) 539 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 540 if (snum) 541 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 542 inet->inet_sport = htons(inet->inet_num); 543 inet->inet_daddr = 0; 544 inet->inet_dport = 0; 545 sk_dst_reset(sk); 546 err = 0; 547 out_release_sock: 548 if (flags & BIND_WITH_LOCK) 549 release_sock(sk); 550 out: 551 return err; 552 } 553 554 int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr, 555 int addr_len, int flags) 556 { 557 struct sock *sk = sock->sk; 558 int err; 559 560 if (addr_len < sizeof(uaddr->sa_family)) 561 return -EINVAL; 562 if (uaddr->sa_family == AF_UNSPEC) 563 return sk->sk_prot->disconnect(sk, flags); 564 565 if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) { 566 err = sk->sk_prot->pre_connect(sk, uaddr, addr_len); 567 if (err) 568 return err; 569 } 570 571 if (!inet_sk(sk)->inet_num && inet_autobind(sk)) 572 return -EAGAIN; 573 return sk->sk_prot->connect(sk, uaddr, addr_len); 574 } 575 EXPORT_SYMBOL(inet_dgram_connect); 576 577 static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias) 578 { 579 DEFINE_WAIT_FUNC(wait, woken_wake_function); 580 581 add_wait_queue(sk_sleep(sk), &wait); 582 sk->sk_write_pending += writebias; 583 584 /* Basic assumption: if someone sets sk->sk_err, he _must_ 585 * change state of the socket from TCP_SYN_*. 586 * Connect() does not allow to get error notifications 587 * without closing the socket. 588 */ 589 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 590 release_sock(sk); 591 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo); 592 lock_sock(sk); 593 if (signal_pending(current) || !timeo) 594 break; 595 } 596 remove_wait_queue(sk_sleep(sk), &wait); 597 sk->sk_write_pending -= writebias; 598 return timeo; 599 } 600 601 /* 602 * Connect to a remote host. There is regrettably still a little 603 * TCP 'magic' in here. 604 */ 605 int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 606 int addr_len, int flags, int is_sendmsg) 607 { 608 struct sock *sk = sock->sk; 609 int err; 610 long timeo; 611 612 /* 613 * uaddr can be NULL and addr_len can be 0 if: 614 * sk is a TCP fastopen active socket and 615 * TCP_FASTOPEN_CONNECT sockopt is set and 616 * we already have a valid cookie for this socket. 617 * In this case, user can call write() after connect(). 618 * write() will invoke tcp_sendmsg_fastopen() which calls 619 * __inet_stream_connect(). 620 */ 621 if (uaddr) { 622 if (addr_len < sizeof(uaddr->sa_family)) 623 return -EINVAL; 624 625 if (uaddr->sa_family == AF_UNSPEC) { 626 err = sk->sk_prot->disconnect(sk, flags); 627 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 628 goto out; 629 } 630 } 631 632 switch (sock->state) { 633 default: 634 err = -EINVAL; 635 goto out; 636 case SS_CONNECTED: 637 err = -EISCONN; 638 goto out; 639 case SS_CONNECTING: 640 if (inet_sk(sk)->defer_connect) 641 err = is_sendmsg ? -EINPROGRESS : -EISCONN; 642 else 643 err = -EALREADY; 644 /* Fall out of switch with err, set for this state */ 645 break; 646 case SS_UNCONNECTED: 647 err = -EISCONN; 648 if (sk->sk_state != TCP_CLOSE) 649 goto out; 650 651 if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) { 652 err = sk->sk_prot->pre_connect(sk, uaddr, addr_len); 653 if (err) 654 goto out; 655 } 656 657 err = sk->sk_prot->connect(sk, uaddr, addr_len); 658 if (err < 0) 659 goto out; 660 661 sock->state = SS_CONNECTING; 662 663 if (!err && inet_sk(sk)->defer_connect) 664 goto out; 665 666 /* Just entered SS_CONNECTING state; the only 667 * difference is that return value in non-blocking 668 * case is EINPROGRESS, rather than EALREADY. 669 */ 670 err = -EINPROGRESS; 671 break; 672 } 673 674 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 675 676 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 677 int writebias = (sk->sk_protocol == IPPROTO_TCP) && 678 tcp_sk(sk)->fastopen_req && 679 tcp_sk(sk)->fastopen_req->data ? 1 : 0; 680 681 /* Error code is set above */ 682 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias)) 683 goto out; 684 685 err = sock_intr_errno(timeo); 686 if (signal_pending(current)) 687 goto out; 688 } 689 690 /* Connection was closed by RST, timeout, ICMP error 691 * or another process disconnected us. 692 */ 693 if (sk->sk_state == TCP_CLOSE) 694 goto sock_error; 695 696 /* sk->sk_err may be not zero now, if RECVERR was ordered by user 697 * and error was received after socket entered established state. 698 * Hence, it is handled normally after connect() return successfully. 699 */ 700 701 sock->state = SS_CONNECTED; 702 err = 0; 703 out: 704 return err; 705 706 sock_error: 707 err = sock_error(sk) ? : -ECONNABORTED; 708 sock->state = SS_UNCONNECTED; 709 if (sk->sk_prot->disconnect(sk, flags)) 710 sock->state = SS_DISCONNECTING; 711 goto out; 712 } 713 EXPORT_SYMBOL(__inet_stream_connect); 714 715 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 716 int addr_len, int flags) 717 { 718 int err; 719 720 lock_sock(sock->sk); 721 err = __inet_stream_connect(sock, uaddr, addr_len, flags, 0); 722 release_sock(sock->sk); 723 return err; 724 } 725 EXPORT_SYMBOL(inet_stream_connect); 726 727 /* 728 * Accept a pending connection. The TCP layer now gives BSD semantics. 729 */ 730 731 int inet_accept(struct socket *sock, struct socket *newsock, int flags, 732 bool kern) 733 { 734 struct sock *sk1 = sock->sk; 735 int err = -EINVAL; 736 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err, kern); 737 738 if (!sk2) 739 goto do_err; 740 741 lock_sock(sk2); 742 743 sock_rps_record_flow(sk2); 744 WARN_ON(!((1 << sk2->sk_state) & 745 (TCPF_ESTABLISHED | TCPF_SYN_RECV | 746 TCPF_CLOSE_WAIT | TCPF_CLOSE))); 747 748 sock_graft(sk2, newsock); 749 750 newsock->state = SS_CONNECTED; 751 err = 0; 752 release_sock(sk2); 753 do_err: 754 return err; 755 } 756 EXPORT_SYMBOL(inet_accept); 757 758 759 /* 760 * This does both peername and sockname. 761 */ 762 int inet_getname(struct socket *sock, struct sockaddr *uaddr, 763 int peer) 764 { 765 struct sock *sk = sock->sk; 766 struct inet_sock *inet = inet_sk(sk); 767 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr); 768 769 sin->sin_family = AF_INET; 770 if (peer) { 771 if (!inet->inet_dport || 772 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 773 peer == 1)) 774 return -ENOTCONN; 775 sin->sin_port = inet->inet_dport; 776 sin->sin_addr.s_addr = inet->inet_daddr; 777 } else { 778 __be32 addr = inet->inet_rcv_saddr; 779 if (!addr) 780 addr = inet->inet_saddr; 781 sin->sin_port = inet->inet_sport; 782 sin->sin_addr.s_addr = addr; 783 } 784 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 785 return sizeof(*sin); 786 } 787 EXPORT_SYMBOL(inet_getname); 788 789 int inet_send_prepare(struct sock *sk) 790 { 791 sock_rps_record_flow(sk); 792 793 /* We may need to bind the socket. */ 794 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 795 inet_autobind(sk)) 796 return -EAGAIN; 797 798 return 0; 799 } 800 EXPORT_SYMBOL_GPL(inet_send_prepare); 801 802 int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) 803 { 804 struct sock *sk = sock->sk; 805 806 if (unlikely(inet_send_prepare(sk))) 807 return -EAGAIN; 808 809 return INDIRECT_CALL_2(sk->sk_prot->sendmsg, tcp_sendmsg, udp_sendmsg, 810 sk, msg, size); 811 } 812 EXPORT_SYMBOL(inet_sendmsg); 813 814 ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, 815 size_t size, int flags) 816 { 817 struct sock *sk = sock->sk; 818 819 if (unlikely(inet_send_prepare(sk))) 820 return -EAGAIN; 821 822 if (sk->sk_prot->sendpage) 823 return sk->sk_prot->sendpage(sk, page, offset, size, flags); 824 return sock_no_sendpage(sock, page, offset, size, flags); 825 } 826 EXPORT_SYMBOL(inet_sendpage); 827 828 INDIRECT_CALLABLE_DECLARE(int udp_recvmsg(struct sock *, struct msghdr *, 829 size_t, int, int, int *)); 830 int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 831 int flags) 832 { 833 struct sock *sk = sock->sk; 834 int addr_len = 0; 835 int err; 836 837 if (likely(!(flags & MSG_ERRQUEUE))) 838 sock_rps_record_flow(sk); 839 840 err = INDIRECT_CALL_2(sk->sk_prot->recvmsg, tcp_recvmsg, udp_recvmsg, 841 sk, msg, size, flags & MSG_DONTWAIT, 842 flags & ~MSG_DONTWAIT, &addr_len); 843 if (err >= 0) 844 msg->msg_namelen = addr_len; 845 return err; 846 } 847 EXPORT_SYMBOL(inet_recvmsg); 848 849 int inet_shutdown(struct socket *sock, int how) 850 { 851 struct sock *sk = sock->sk; 852 int err = 0; 853 854 /* This should really check to make sure 855 * the socket is a TCP socket. (WHY AC...) 856 */ 857 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and 858 1->2 bit 2 snds. 859 2->3 */ 860 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ 861 return -EINVAL; 862 863 lock_sock(sk); 864 if (sock->state == SS_CONNECTING) { 865 if ((1 << sk->sk_state) & 866 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) 867 sock->state = SS_DISCONNECTING; 868 else 869 sock->state = SS_CONNECTED; 870 } 871 872 switch (sk->sk_state) { 873 case TCP_CLOSE: 874 err = -ENOTCONN; 875 /* Hack to wake up other listeners, who can poll for 876 EPOLLHUP, even on eg. unconnected UDP sockets -- RR */ 877 fallthrough; 878 default: 879 sk->sk_shutdown |= how; 880 if (sk->sk_prot->shutdown) 881 sk->sk_prot->shutdown(sk, how); 882 break; 883 884 /* Remaining two branches are temporary solution for missing 885 * close() in multithreaded environment. It is _not_ a good idea, 886 * but we have no choice until close() is repaired at VFS level. 887 */ 888 case TCP_LISTEN: 889 if (!(how & RCV_SHUTDOWN)) 890 break; 891 fallthrough; 892 case TCP_SYN_SENT: 893 err = sk->sk_prot->disconnect(sk, O_NONBLOCK); 894 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 895 break; 896 } 897 898 /* Wake up anyone sleeping in poll. */ 899 sk->sk_state_change(sk); 900 release_sock(sk); 901 return err; 902 } 903 EXPORT_SYMBOL(inet_shutdown); 904 905 /* 906 * ioctl() calls you can issue on an INET socket. Most of these are 907 * device configuration and stuff and very rarely used. Some ioctls 908 * pass on to the socket itself. 909 * 910 * NOTE: I like the idea of a module for the config stuff. ie ifconfig 911 * loads the devconfigure module does its configuring and unloads it. 912 * There's a good 20K of config code hanging around the kernel. 913 */ 914 915 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 916 { 917 struct sock *sk = sock->sk; 918 int err = 0; 919 struct net *net = sock_net(sk); 920 void __user *p = (void __user *)arg; 921 struct ifreq ifr; 922 struct rtentry rt; 923 924 switch (cmd) { 925 case SIOCADDRT: 926 case SIOCDELRT: 927 if (copy_from_user(&rt, p, sizeof(struct rtentry))) 928 return -EFAULT; 929 err = ip_rt_ioctl(net, cmd, &rt); 930 break; 931 case SIOCRTMSG: 932 err = -EINVAL; 933 break; 934 case SIOCDARP: 935 case SIOCGARP: 936 case SIOCSARP: 937 err = arp_ioctl(net, cmd, (void __user *)arg); 938 break; 939 case SIOCGIFADDR: 940 case SIOCGIFBRDADDR: 941 case SIOCGIFNETMASK: 942 case SIOCGIFDSTADDR: 943 case SIOCGIFPFLAGS: 944 if (copy_from_user(&ifr, p, sizeof(struct ifreq))) 945 return -EFAULT; 946 err = devinet_ioctl(net, cmd, &ifr); 947 if (!err && copy_to_user(p, &ifr, sizeof(struct ifreq))) 948 err = -EFAULT; 949 break; 950 951 case SIOCSIFADDR: 952 case SIOCSIFBRDADDR: 953 case SIOCSIFNETMASK: 954 case SIOCSIFDSTADDR: 955 case SIOCSIFPFLAGS: 956 case SIOCSIFFLAGS: 957 if (copy_from_user(&ifr, p, sizeof(struct ifreq))) 958 return -EFAULT; 959 err = devinet_ioctl(net, cmd, &ifr); 960 break; 961 default: 962 if (sk->sk_prot->ioctl) 963 err = sk->sk_prot->ioctl(sk, cmd, arg); 964 else 965 err = -ENOIOCTLCMD; 966 break; 967 } 968 return err; 969 } 970 EXPORT_SYMBOL(inet_ioctl); 971 972 #ifdef CONFIG_COMPAT 973 static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 974 { 975 struct sock *sk = sock->sk; 976 int err = -ENOIOCTLCMD; 977 978 if (sk->sk_prot->compat_ioctl) 979 err = sk->sk_prot->compat_ioctl(sk, cmd, arg); 980 981 return err; 982 } 983 #endif 984 985 const struct proto_ops inet_stream_ops = { 986 .family = PF_INET, 987 .owner = THIS_MODULE, 988 .release = inet_release, 989 .bind = inet_bind, 990 .connect = inet_stream_connect, 991 .socketpair = sock_no_socketpair, 992 .accept = inet_accept, 993 .getname = inet_getname, 994 .poll = tcp_poll, 995 .ioctl = inet_ioctl, 996 .gettstamp = sock_gettstamp, 997 .listen = inet_listen, 998 .shutdown = inet_shutdown, 999 .setsockopt = sock_common_setsockopt, 1000 .getsockopt = sock_common_getsockopt, 1001 .sendmsg = inet_sendmsg, 1002 .recvmsg = inet_recvmsg, 1003 #ifdef CONFIG_MMU 1004 .mmap = tcp_mmap, 1005 #endif 1006 .sendpage = inet_sendpage, 1007 .splice_read = tcp_splice_read, 1008 .read_sock = tcp_read_sock, 1009 .sendmsg_locked = tcp_sendmsg_locked, 1010 .sendpage_locked = tcp_sendpage_locked, 1011 .peek_len = tcp_peek_len, 1012 #ifdef CONFIG_COMPAT 1013 .compat_setsockopt = compat_sock_common_setsockopt, 1014 .compat_getsockopt = compat_sock_common_getsockopt, 1015 .compat_ioctl = inet_compat_ioctl, 1016 #endif 1017 .set_rcvlowat = tcp_set_rcvlowat, 1018 }; 1019 EXPORT_SYMBOL(inet_stream_ops); 1020 1021 const struct proto_ops inet_dgram_ops = { 1022 .family = PF_INET, 1023 .owner = THIS_MODULE, 1024 .release = inet_release, 1025 .bind = inet_bind, 1026 .connect = inet_dgram_connect, 1027 .socketpair = sock_no_socketpair, 1028 .accept = sock_no_accept, 1029 .getname = inet_getname, 1030 .poll = udp_poll, 1031 .ioctl = inet_ioctl, 1032 .gettstamp = sock_gettstamp, 1033 .listen = sock_no_listen, 1034 .shutdown = inet_shutdown, 1035 .setsockopt = sock_common_setsockopt, 1036 .getsockopt = sock_common_getsockopt, 1037 .sendmsg = inet_sendmsg, 1038 .recvmsg = inet_recvmsg, 1039 .mmap = sock_no_mmap, 1040 .sendpage = inet_sendpage, 1041 .set_peek_off = sk_set_peek_off, 1042 #ifdef CONFIG_COMPAT 1043 .compat_setsockopt = compat_sock_common_setsockopt, 1044 .compat_getsockopt = compat_sock_common_getsockopt, 1045 .compat_ioctl = inet_compat_ioctl, 1046 #endif 1047 }; 1048 EXPORT_SYMBOL(inet_dgram_ops); 1049 1050 /* 1051 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 1052 * udp_poll 1053 */ 1054 static const struct proto_ops inet_sockraw_ops = { 1055 .family = PF_INET, 1056 .owner = THIS_MODULE, 1057 .release = inet_release, 1058 .bind = inet_bind, 1059 .connect = inet_dgram_connect, 1060 .socketpair = sock_no_socketpair, 1061 .accept = sock_no_accept, 1062 .getname = inet_getname, 1063 .poll = datagram_poll, 1064 .ioctl = inet_ioctl, 1065 .gettstamp = sock_gettstamp, 1066 .listen = sock_no_listen, 1067 .shutdown = inet_shutdown, 1068 .setsockopt = sock_common_setsockopt, 1069 .getsockopt = sock_common_getsockopt, 1070 .sendmsg = inet_sendmsg, 1071 .recvmsg = inet_recvmsg, 1072 .mmap = sock_no_mmap, 1073 .sendpage = inet_sendpage, 1074 #ifdef CONFIG_COMPAT 1075 .compat_setsockopt = compat_sock_common_setsockopt, 1076 .compat_getsockopt = compat_sock_common_getsockopt, 1077 .compat_ioctl = inet_compat_ioctl, 1078 #endif 1079 }; 1080 1081 static const struct net_proto_family inet_family_ops = { 1082 .family = PF_INET, 1083 .create = inet_create, 1084 .owner = THIS_MODULE, 1085 }; 1086 1087 /* Upon startup we insert all the elements in inetsw_array[] into 1088 * the linked list inetsw. 1089 */ 1090 static struct inet_protosw inetsw_array[] = 1091 { 1092 { 1093 .type = SOCK_STREAM, 1094 .protocol = IPPROTO_TCP, 1095 .prot = &tcp_prot, 1096 .ops = &inet_stream_ops, 1097 .flags = INET_PROTOSW_PERMANENT | 1098 INET_PROTOSW_ICSK, 1099 }, 1100 1101 { 1102 .type = SOCK_DGRAM, 1103 .protocol = IPPROTO_UDP, 1104 .prot = &udp_prot, 1105 .ops = &inet_dgram_ops, 1106 .flags = INET_PROTOSW_PERMANENT, 1107 }, 1108 1109 { 1110 .type = SOCK_DGRAM, 1111 .protocol = IPPROTO_ICMP, 1112 .prot = &ping_prot, 1113 .ops = &inet_sockraw_ops, 1114 .flags = INET_PROTOSW_REUSE, 1115 }, 1116 1117 { 1118 .type = SOCK_RAW, 1119 .protocol = IPPROTO_IP, /* wild card */ 1120 .prot = &raw_prot, 1121 .ops = &inet_sockraw_ops, 1122 .flags = INET_PROTOSW_REUSE, 1123 } 1124 }; 1125 1126 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) 1127 1128 void inet_register_protosw(struct inet_protosw *p) 1129 { 1130 struct list_head *lh; 1131 struct inet_protosw *answer; 1132 int protocol = p->protocol; 1133 struct list_head *last_perm; 1134 1135 spin_lock_bh(&inetsw_lock); 1136 1137 if (p->type >= SOCK_MAX) 1138 goto out_illegal; 1139 1140 /* If we are trying to override a permanent protocol, bail. */ 1141 last_perm = &inetsw[p->type]; 1142 list_for_each(lh, &inetsw[p->type]) { 1143 answer = list_entry(lh, struct inet_protosw, list); 1144 /* Check only the non-wild match. */ 1145 if ((INET_PROTOSW_PERMANENT & answer->flags) == 0) 1146 break; 1147 if (protocol == answer->protocol) 1148 goto out_permanent; 1149 last_perm = lh; 1150 } 1151 1152 /* Add the new entry after the last permanent entry if any, so that 1153 * the new entry does not override a permanent entry when matched with 1154 * a wild-card protocol. But it is allowed to override any existing 1155 * non-permanent entry. This means that when we remove this entry, the 1156 * system automatically returns to the old behavior. 1157 */ 1158 list_add_rcu(&p->list, last_perm); 1159 out: 1160 spin_unlock_bh(&inetsw_lock); 1161 1162 return; 1163 1164 out_permanent: 1165 pr_err("Attempt to override permanent protocol %d\n", protocol); 1166 goto out; 1167 1168 out_illegal: 1169 pr_err("Ignoring attempt to register invalid socket type %d\n", 1170 p->type); 1171 goto out; 1172 } 1173 EXPORT_SYMBOL(inet_register_protosw); 1174 1175 void inet_unregister_protosw(struct inet_protosw *p) 1176 { 1177 if (INET_PROTOSW_PERMANENT & p->flags) { 1178 pr_err("Attempt to unregister permanent protocol %d\n", 1179 p->protocol); 1180 } else { 1181 spin_lock_bh(&inetsw_lock); 1182 list_del_rcu(&p->list); 1183 spin_unlock_bh(&inetsw_lock); 1184 1185 synchronize_net(); 1186 } 1187 } 1188 EXPORT_SYMBOL(inet_unregister_protosw); 1189 1190 static int inet_sk_reselect_saddr(struct sock *sk) 1191 { 1192 struct inet_sock *inet = inet_sk(sk); 1193 __be32 old_saddr = inet->inet_saddr; 1194 __be32 daddr = inet->inet_daddr; 1195 struct flowi4 *fl4; 1196 struct rtable *rt; 1197 __be32 new_saddr; 1198 struct ip_options_rcu *inet_opt; 1199 1200 inet_opt = rcu_dereference_protected(inet->inet_opt, 1201 lockdep_sock_is_held(sk)); 1202 if (inet_opt && inet_opt->opt.srr) 1203 daddr = inet_opt->opt.faddr; 1204 1205 /* Query new route. */ 1206 fl4 = &inet->cork.fl.u.ip4; 1207 rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk), 1208 sk->sk_bound_dev_if, sk->sk_protocol, 1209 inet->inet_sport, inet->inet_dport, sk); 1210 if (IS_ERR(rt)) 1211 return PTR_ERR(rt); 1212 1213 sk_setup_caps(sk, &rt->dst); 1214 1215 new_saddr = fl4->saddr; 1216 1217 if (new_saddr == old_saddr) 1218 return 0; 1219 1220 if (sock_net(sk)->ipv4.sysctl_ip_dynaddr > 1) { 1221 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n", 1222 __func__, &old_saddr, &new_saddr); 1223 } 1224 1225 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr; 1226 1227 /* 1228 * XXX The only one ugly spot where we need to 1229 * XXX really change the sockets identity after 1230 * XXX it has entered the hashes. -DaveM 1231 * 1232 * Besides that, it does not check for connection 1233 * uniqueness. Wait for troubles. 1234 */ 1235 return __sk_prot_rehash(sk); 1236 } 1237 1238 int inet_sk_rebuild_header(struct sock *sk) 1239 { 1240 struct inet_sock *inet = inet_sk(sk); 1241 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); 1242 __be32 daddr; 1243 struct ip_options_rcu *inet_opt; 1244 struct flowi4 *fl4; 1245 int err; 1246 1247 /* Route is OK, nothing to do. */ 1248 if (rt) 1249 return 0; 1250 1251 /* Reroute. */ 1252 rcu_read_lock(); 1253 inet_opt = rcu_dereference(inet->inet_opt); 1254 daddr = inet->inet_daddr; 1255 if (inet_opt && inet_opt->opt.srr) 1256 daddr = inet_opt->opt.faddr; 1257 rcu_read_unlock(); 1258 fl4 = &inet->cork.fl.u.ip4; 1259 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr, 1260 inet->inet_dport, inet->inet_sport, 1261 sk->sk_protocol, RT_CONN_FLAGS(sk), 1262 sk->sk_bound_dev_if); 1263 if (!IS_ERR(rt)) { 1264 err = 0; 1265 sk_setup_caps(sk, &rt->dst); 1266 } else { 1267 err = PTR_ERR(rt); 1268 1269 /* Routing failed... */ 1270 sk->sk_route_caps = 0; 1271 /* 1272 * Other protocols have to map its equivalent state to TCP_SYN_SENT. 1273 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme 1274 */ 1275 if (!sock_net(sk)->ipv4.sysctl_ip_dynaddr || 1276 sk->sk_state != TCP_SYN_SENT || 1277 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 1278 (err = inet_sk_reselect_saddr(sk)) != 0) 1279 sk->sk_err_soft = -err; 1280 } 1281 1282 return err; 1283 } 1284 EXPORT_SYMBOL(inet_sk_rebuild_header); 1285 1286 void inet_sk_set_state(struct sock *sk, int state) 1287 { 1288 trace_inet_sock_set_state(sk, sk->sk_state, state); 1289 sk->sk_state = state; 1290 } 1291 EXPORT_SYMBOL(inet_sk_set_state); 1292 1293 void inet_sk_state_store(struct sock *sk, int newstate) 1294 { 1295 trace_inet_sock_set_state(sk, sk->sk_state, newstate); 1296 smp_store_release(&sk->sk_state, newstate); 1297 } 1298 1299 struct sk_buff *inet_gso_segment(struct sk_buff *skb, 1300 netdev_features_t features) 1301 { 1302 bool udpfrag = false, fixedid = false, gso_partial, encap; 1303 struct sk_buff *segs = ERR_PTR(-EINVAL); 1304 const struct net_offload *ops; 1305 unsigned int offset = 0; 1306 struct iphdr *iph; 1307 int proto, tot_len; 1308 int nhoff; 1309 int ihl; 1310 int id; 1311 1312 skb_reset_network_header(skb); 1313 nhoff = skb_network_header(skb) - skb_mac_header(skb); 1314 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1315 goto out; 1316 1317 iph = ip_hdr(skb); 1318 ihl = iph->ihl * 4; 1319 if (ihl < sizeof(*iph)) 1320 goto out; 1321 1322 id = ntohs(iph->id); 1323 proto = iph->protocol; 1324 1325 /* Warning: after this point, iph might be no longer valid */ 1326 if (unlikely(!pskb_may_pull(skb, ihl))) 1327 goto out; 1328 __skb_pull(skb, ihl); 1329 1330 encap = SKB_GSO_CB(skb)->encap_level > 0; 1331 if (encap) 1332 features &= skb->dev->hw_enc_features; 1333 SKB_GSO_CB(skb)->encap_level += ihl; 1334 1335 skb_reset_transport_header(skb); 1336 1337 segs = ERR_PTR(-EPROTONOSUPPORT); 1338 1339 if (!skb->encapsulation || encap) { 1340 udpfrag = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP); 1341 fixedid = !!(skb_shinfo(skb)->gso_type & SKB_GSO_TCP_FIXEDID); 1342 1343 /* fixed ID is invalid if DF bit is not set */ 1344 if (fixedid && !(ip_hdr(skb)->frag_off & htons(IP_DF))) 1345 goto out; 1346 } 1347 1348 ops = rcu_dereference(inet_offloads[proto]); 1349 if (likely(ops && ops->callbacks.gso_segment)) 1350 segs = ops->callbacks.gso_segment(skb, features); 1351 1352 if (IS_ERR_OR_NULL(segs)) 1353 goto out; 1354 1355 gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL); 1356 1357 skb = segs; 1358 do { 1359 iph = (struct iphdr *)(skb_mac_header(skb) + nhoff); 1360 if (udpfrag) { 1361 iph->frag_off = htons(offset >> 3); 1362 if (skb->next) 1363 iph->frag_off |= htons(IP_MF); 1364 offset += skb->len - nhoff - ihl; 1365 tot_len = skb->len - nhoff; 1366 } else if (skb_is_gso(skb)) { 1367 if (!fixedid) { 1368 iph->id = htons(id); 1369 id += skb_shinfo(skb)->gso_segs; 1370 } 1371 1372 if (gso_partial) 1373 tot_len = skb_shinfo(skb)->gso_size + 1374 SKB_GSO_CB(skb)->data_offset + 1375 skb->head - (unsigned char *)iph; 1376 else 1377 tot_len = skb->len - nhoff; 1378 } else { 1379 if (!fixedid) 1380 iph->id = htons(id++); 1381 tot_len = skb->len - nhoff; 1382 } 1383 iph->tot_len = htons(tot_len); 1384 ip_send_check(iph); 1385 if (encap) 1386 skb_reset_inner_headers(skb); 1387 skb->network_header = (u8 *)iph - skb->head; 1388 skb_reset_mac_len(skb); 1389 } while ((skb = skb->next)); 1390 1391 out: 1392 return segs; 1393 } 1394 EXPORT_SYMBOL(inet_gso_segment); 1395 1396 static struct sk_buff *ipip_gso_segment(struct sk_buff *skb, 1397 netdev_features_t features) 1398 { 1399 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_IPXIP4)) 1400 return ERR_PTR(-EINVAL); 1401 1402 return inet_gso_segment(skb, features); 1403 } 1404 1405 INDIRECT_CALLABLE_DECLARE(struct sk_buff *tcp4_gro_receive(struct list_head *, 1406 struct sk_buff *)); 1407 INDIRECT_CALLABLE_DECLARE(struct sk_buff *udp4_gro_receive(struct list_head *, 1408 struct sk_buff *)); 1409 struct sk_buff *inet_gro_receive(struct list_head *head, struct sk_buff *skb) 1410 { 1411 const struct net_offload *ops; 1412 struct sk_buff *pp = NULL; 1413 const struct iphdr *iph; 1414 struct sk_buff *p; 1415 unsigned int hlen; 1416 unsigned int off; 1417 unsigned int id; 1418 int flush = 1; 1419 int proto; 1420 1421 off = skb_gro_offset(skb); 1422 hlen = off + sizeof(*iph); 1423 iph = skb_gro_header_fast(skb, off); 1424 if (skb_gro_header_hard(skb, hlen)) { 1425 iph = skb_gro_header_slow(skb, hlen, off); 1426 if (unlikely(!iph)) 1427 goto out; 1428 } 1429 1430 proto = iph->protocol; 1431 1432 rcu_read_lock(); 1433 ops = rcu_dereference(inet_offloads[proto]); 1434 if (!ops || !ops->callbacks.gro_receive) 1435 goto out_unlock; 1436 1437 if (*(u8 *)iph != 0x45) 1438 goto out_unlock; 1439 1440 if (ip_is_fragment(iph)) 1441 goto out_unlock; 1442 1443 if (unlikely(ip_fast_csum((u8 *)iph, 5))) 1444 goto out_unlock; 1445 1446 id = ntohl(*(__be32 *)&iph->id); 1447 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF)); 1448 id >>= 16; 1449 1450 list_for_each_entry(p, head, list) { 1451 struct iphdr *iph2; 1452 u16 flush_id; 1453 1454 if (!NAPI_GRO_CB(p)->same_flow) 1455 continue; 1456 1457 iph2 = (struct iphdr *)(p->data + off); 1458 /* The above works because, with the exception of the top 1459 * (inner most) layer, we only aggregate pkts with the same 1460 * hdr length so all the hdrs we'll need to verify will start 1461 * at the same offset. 1462 */ 1463 if ((iph->protocol ^ iph2->protocol) | 1464 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) | 1465 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) { 1466 NAPI_GRO_CB(p)->same_flow = 0; 1467 continue; 1468 } 1469 1470 /* All fields must match except length and checksum. */ 1471 NAPI_GRO_CB(p)->flush |= 1472 (iph->ttl ^ iph2->ttl) | 1473 (iph->tos ^ iph2->tos) | 1474 ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF)); 1475 1476 NAPI_GRO_CB(p)->flush |= flush; 1477 1478 /* We need to store of the IP ID check to be included later 1479 * when we can verify that this packet does in fact belong 1480 * to a given flow. 1481 */ 1482 flush_id = (u16)(id - ntohs(iph2->id)); 1483 1484 /* This bit of code makes it much easier for us to identify 1485 * the cases where we are doing atomic vs non-atomic IP ID 1486 * checks. Specifically an atomic check can return IP ID 1487 * values 0 - 0xFFFF, while a non-atomic check can only 1488 * return 0 or 0xFFFF. 1489 */ 1490 if (!NAPI_GRO_CB(p)->is_atomic || 1491 !(iph->frag_off & htons(IP_DF))) { 1492 flush_id ^= NAPI_GRO_CB(p)->count; 1493 flush_id = flush_id ? 0xFFFF : 0; 1494 } 1495 1496 /* If the previous IP ID value was based on an atomic 1497 * datagram we can overwrite the value and ignore it. 1498 */ 1499 if (NAPI_GRO_CB(skb)->is_atomic) 1500 NAPI_GRO_CB(p)->flush_id = flush_id; 1501 else 1502 NAPI_GRO_CB(p)->flush_id |= flush_id; 1503 } 1504 1505 NAPI_GRO_CB(skb)->is_atomic = !!(iph->frag_off & htons(IP_DF)); 1506 NAPI_GRO_CB(skb)->flush |= flush; 1507 skb_set_network_header(skb, off); 1508 /* The above will be needed by the transport layer if there is one 1509 * immediately following this IP hdr. 1510 */ 1511 1512 /* Note : No need to call skb_gro_postpull_rcsum() here, 1513 * as we already checked checksum over ipv4 header was 0 1514 */ 1515 skb_gro_pull(skb, sizeof(*iph)); 1516 skb_set_transport_header(skb, skb_gro_offset(skb)); 1517 1518 pp = indirect_call_gro_receive(tcp4_gro_receive, udp4_gro_receive, 1519 ops->callbacks.gro_receive, head, skb); 1520 1521 out_unlock: 1522 rcu_read_unlock(); 1523 1524 out: 1525 skb_gro_flush_final(skb, pp, flush); 1526 1527 return pp; 1528 } 1529 EXPORT_SYMBOL(inet_gro_receive); 1530 1531 static struct sk_buff *ipip_gro_receive(struct list_head *head, 1532 struct sk_buff *skb) 1533 { 1534 if (NAPI_GRO_CB(skb)->encap_mark) { 1535 NAPI_GRO_CB(skb)->flush = 1; 1536 return NULL; 1537 } 1538 1539 NAPI_GRO_CB(skb)->encap_mark = 1; 1540 1541 return inet_gro_receive(head, skb); 1542 } 1543 1544 #define SECONDS_PER_DAY 86400 1545 1546 /* inet_current_timestamp - Return IP network timestamp 1547 * 1548 * Return milliseconds since midnight in network byte order. 1549 */ 1550 __be32 inet_current_timestamp(void) 1551 { 1552 u32 secs; 1553 u32 msecs; 1554 struct timespec64 ts; 1555 1556 ktime_get_real_ts64(&ts); 1557 1558 /* Get secs since midnight. */ 1559 (void)div_u64_rem(ts.tv_sec, SECONDS_PER_DAY, &secs); 1560 /* Convert to msecs. */ 1561 msecs = secs * MSEC_PER_SEC; 1562 /* Convert nsec to msec. */ 1563 msecs += (u32)ts.tv_nsec / NSEC_PER_MSEC; 1564 1565 /* Convert to network byte order. */ 1566 return htonl(msecs); 1567 } 1568 EXPORT_SYMBOL(inet_current_timestamp); 1569 1570 int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 1571 { 1572 if (sk->sk_family == AF_INET) 1573 return ip_recv_error(sk, msg, len, addr_len); 1574 #if IS_ENABLED(CONFIG_IPV6) 1575 if (sk->sk_family == AF_INET6) 1576 return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len); 1577 #endif 1578 return -EINVAL; 1579 } 1580 1581 INDIRECT_CALLABLE_DECLARE(int tcp4_gro_complete(struct sk_buff *, int)); 1582 INDIRECT_CALLABLE_DECLARE(int udp4_gro_complete(struct sk_buff *, int)); 1583 int inet_gro_complete(struct sk_buff *skb, int nhoff) 1584 { 1585 __be16 newlen = htons(skb->len - nhoff); 1586 struct iphdr *iph = (struct iphdr *)(skb->data + nhoff); 1587 const struct net_offload *ops; 1588 int proto = iph->protocol; 1589 int err = -ENOSYS; 1590 1591 if (skb->encapsulation) { 1592 skb_set_inner_protocol(skb, cpu_to_be16(ETH_P_IP)); 1593 skb_set_inner_network_header(skb, nhoff); 1594 } 1595 1596 csum_replace2(&iph->check, iph->tot_len, newlen); 1597 iph->tot_len = newlen; 1598 1599 rcu_read_lock(); 1600 ops = rcu_dereference(inet_offloads[proto]); 1601 if (WARN_ON(!ops || !ops->callbacks.gro_complete)) 1602 goto out_unlock; 1603 1604 /* Only need to add sizeof(*iph) to get to the next hdr below 1605 * because any hdr with option will have been flushed in 1606 * inet_gro_receive(). 1607 */ 1608 err = INDIRECT_CALL_2(ops->callbacks.gro_complete, 1609 tcp4_gro_complete, udp4_gro_complete, 1610 skb, nhoff + sizeof(*iph)); 1611 1612 out_unlock: 1613 rcu_read_unlock(); 1614 1615 return err; 1616 } 1617 EXPORT_SYMBOL(inet_gro_complete); 1618 1619 static int ipip_gro_complete(struct sk_buff *skb, int nhoff) 1620 { 1621 skb->encapsulation = 1; 1622 skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4; 1623 return inet_gro_complete(skb, nhoff); 1624 } 1625 1626 int inet_ctl_sock_create(struct sock **sk, unsigned short family, 1627 unsigned short type, unsigned char protocol, 1628 struct net *net) 1629 { 1630 struct socket *sock; 1631 int rc = sock_create_kern(net, family, type, protocol, &sock); 1632 1633 if (rc == 0) { 1634 *sk = sock->sk; 1635 (*sk)->sk_allocation = GFP_ATOMIC; 1636 /* 1637 * Unhash it so that IP input processing does not even see it, 1638 * we do not wish this socket to see incoming packets. 1639 */ 1640 (*sk)->sk_prot->unhash(*sk); 1641 } 1642 return rc; 1643 } 1644 EXPORT_SYMBOL_GPL(inet_ctl_sock_create); 1645 1646 u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offt) 1647 { 1648 return *(((unsigned long *)per_cpu_ptr(mib, cpu)) + offt); 1649 } 1650 EXPORT_SYMBOL_GPL(snmp_get_cpu_field); 1651 1652 unsigned long snmp_fold_field(void __percpu *mib, int offt) 1653 { 1654 unsigned long res = 0; 1655 int i; 1656 1657 for_each_possible_cpu(i) 1658 res += snmp_get_cpu_field(mib, i, offt); 1659 return res; 1660 } 1661 EXPORT_SYMBOL_GPL(snmp_fold_field); 1662 1663 #if BITS_PER_LONG==32 1664 1665 u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offt, 1666 size_t syncp_offset) 1667 { 1668 void *bhptr; 1669 struct u64_stats_sync *syncp; 1670 u64 v; 1671 unsigned int start; 1672 1673 bhptr = per_cpu_ptr(mib, cpu); 1674 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset); 1675 do { 1676 start = u64_stats_fetch_begin_irq(syncp); 1677 v = *(((u64 *)bhptr) + offt); 1678 } while (u64_stats_fetch_retry_irq(syncp, start)); 1679 1680 return v; 1681 } 1682 EXPORT_SYMBOL_GPL(snmp_get_cpu_field64); 1683 1684 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset) 1685 { 1686 u64 res = 0; 1687 int cpu; 1688 1689 for_each_possible_cpu(cpu) { 1690 res += snmp_get_cpu_field64(mib, cpu, offt, syncp_offset); 1691 } 1692 return res; 1693 } 1694 EXPORT_SYMBOL_GPL(snmp_fold_field64); 1695 #endif 1696 1697 #ifdef CONFIG_IP_MULTICAST 1698 static const struct net_protocol igmp_protocol = { 1699 .handler = igmp_rcv, 1700 .netns_ok = 1, 1701 }; 1702 #endif 1703 1704 /* thinking of making this const? Don't. 1705 * early_demux can change based on sysctl. 1706 */ 1707 static struct net_protocol tcp_protocol = { 1708 .early_demux = tcp_v4_early_demux, 1709 .early_demux_handler = tcp_v4_early_demux, 1710 .handler = tcp_v4_rcv, 1711 .err_handler = tcp_v4_err, 1712 .no_policy = 1, 1713 .netns_ok = 1, 1714 .icmp_strict_tag_validation = 1, 1715 }; 1716 1717 /* thinking of making this const? Don't. 1718 * early_demux can change based on sysctl. 1719 */ 1720 static struct net_protocol udp_protocol = { 1721 .early_demux = udp_v4_early_demux, 1722 .early_demux_handler = udp_v4_early_demux, 1723 .handler = udp_rcv, 1724 .err_handler = udp_err, 1725 .no_policy = 1, 1726 .netns_ok = 1, 1727 }; 1728 1729 static const struct net_protocol icmp_protocol = { 1730 .handler = icmp_rcv, 1731 .err_handler = icmp_err, 1732 .no_policy = 1, 1733 .netns_ok = 1, 1734 }; 1735 1736 static __net_init int ipv4_mib_init_net(struct net *net) 1737 { 1738 int i; 1739 1740 net->mib.tcp_statistics = alloc_percpu(struct tcp_mib); 1741 if (!net->mib.tcp_statistics) 1742 goto err_tcp_mib; 1743 net->mib.ip_statistics = alloc_percpu(struct ipstats_mib); 1744 if (!net->mib.ip_statistics) 1745 goto err_ip_mib; 1746 1747 for_each_possible_cpu(i) { 1748 struct ipstats_mib *af_inet_stats; 1749 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i); 1750 u64_stats_init(&af_inet_stats->syncp); 1751 } 1752 1753 net->mib.net_statistics = alloc_percpu(struct linux_mib); 1754 if (!net->mib.net_statistics) 1755 goto err_net_mib; 1756 net->mib.udp_statistics = alloc_percpu(struct udp_mib); 1757 if (!net->mib.udp_statistics) 1758 goto err_udp_mib; 1759 net->mib.udplite_statistics = alloc_percpu(struct udp_mib); 1760 if (!net->mib.udplite_statistics) 1761 goto err_udplite_mib; 1762 net->mib.icmp_statistics = alloc_percpu(struct icmp_mib); 1763 if (!net->mib.icmp_statistics) 1764 goto err_icmp_mib; 1765 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib), 1766 GFP_KERNEL); 1767 if (!net->mib.icmpmsg_statistics) 1768 goto err_icmpmsg_mib; 1769 1770 tcp_mib_init(net); 1771 return 0; 1772 1773 err_icmpmsg_mib: 1774 free_percpu(net->mib.icmp_statistics); 1775 err_icmp_mib: 1776 free_percpu(net->mib.udplite_statistics); 1777 err_udplite_mib: 1778 free_percpu(net->mib.udp_statistics); 1779 err_udp_mib: 1780 free_percpu(net->mib.net_statistics); 1781 err_net_mib: 1782 free_percpu(net->mib.ip_statistics); 1783 err_ip_mib: 1784 free_percpu(net->mib.tcp_statistics); 1785 err_tcp_mib: 1786 return -ENOMEM; 1787 } 1788 1789 static __net_exit void ipv4_mib_exit_net(struct net *net) 1790 { 1791 kfree(net->mib.icmpmsg_statistics); 1792 free_percpu(net->mib.icmp_statistics); 1793 free_percpu(net->mib.udplite_statistics); 1794 free_percpu(net->mib.udp_statistics); 1795 free_percpu(net->mib.net_statistics); 1796 free_percpu(net->mib.ip_statistics); 1797 free_percpu(net->mib.tcp_statistics); 1798 #ifdef CONFIG_MPTCP 1799 /* allocated on demand, see mptcp_init_sock() */ 1800 free_percpu(net->mib.mptcp_statistics); 1801 #endif 1802 } 1803 1804 static __net_initdata struct pernet_operations ipv4_mib_ops = { 1805 .init = ipv4_mib_init_net, 1806 .exit = ipv4_mib_exit_net, 1807 }; 1808 1809 static int __init init_ipv4_mibs(void) 1810 { 1811 return register_pernet_subsys(&ipv4_mib_ops); 1812 } 1813 1814 static __net_init int inet_init_net(struct net *net) 1815 { 1816 /* 1817 * Set defaults for local port range 1818 */ 1819 seqlock_init(&net->ipv4.ip_local_ports.lock); 1820 net->ipv4.ip_local_ports.range[0] = 32768; 1821 net->ipv4.ip_local_ports.range[1] = 60999; 1822 1823 seqlock_init(&net->ipv4.ping_group_range.lock); 1824 /* 1825 * Sane defaults - nobody may create ping sockets. 1826 * Boot scripts should set this to distro-specific group. 1827 */ 1828 net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1); 1829 net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0); 1830 1831 /* Default values for sysctl-controlled parameters. 1832 * We set them here, in case sysctl is not compiled. 1833 */ 1834 net->ipv4.sysctl_ip_default_ttl = IPDEFTTL; 1835 net->ipv4.sysctl_ip_fwd_update_priority = 1; 1836 net->ipv4.sysctl_ip_dynaddr = 0; 1837 net->ipv4.sysctl_ip_early_demux = 1; 1838 net->ipv4.sysctl_udp_early_demux = 1; 1839 net->ipv4.sysctl_tcp_early_demux = 1; 1840 net->ipv4.sysctl_nexthop_compat_mode = 1; 1841 #ifdef CONFIG_SYSCTL 1842 net->ipv4.sysctl_ip_prot_sock = PROT_SOCK; 1843 #endif 1844 1845 /* Some igmp sysctl, whose values are always used */ 1846 net->ipv4.sysctl_igmp_max_memberships = 20; 1847 net->ipv4.sysctl_igmp_max_msf = 10; 1848 /* IGMP reports for link-local multicast groups are enabled by default */ 1849 net->ipv4.sysctl_igmp_llm_reports = 1; 1850 net->ipv4.sysctl_igmp_qrv = 2; 1851 1852 return 0; 1853 } 1854 1855 static __net_initdata struct pernet_operations af_inet_ops = { 1856 .init = inet_init_net, 1857 }; 1858 1859 static int __init init_inet_pernet_ops(void) 1860 { 1861 return register_pernet_subsys(&af_inet_ops); 1862 } 1863 1864 static int ipv4_proc_init(void); 1865 1866 /* 1867 * IP protocol layer initialiser 1868 */ 1869 1870 static struct packet_offload ip_packet_offload __read_mostly = { 1871 .type = cpu_to_be16(ETH_P_IP), 1872 .callbacks = { 1873 .gso_segment = inet_gso_segment, 1874 .gro_receive = inet_gro_receive, 1875 .gro_complete = inet_gro_complete, 1876 }, 1877 }; 1878 1879 static const struct net_offload ipip_offload = { 1880 .callbacks = { 1881 .gso_segment = ipip_gso_segment, 1882 .gro_receive = ipip_gro_receive, 1883 .gro_complete = ipip_gro_complete, 1884 }, 1885 }; 1886 1887 static int __init ipip_offload_init(void) 1888 { 1889 return inet_add_offload(&ipip_offload, IPPROTO_IPIP); 1890 } 1891 1892 static int __init ipv4_offload_init(void) 1893 { 1894 /* 1895 * Add offloads 1896 */ 1897 if (udpv4_offload_init() < 0) 1898 pr_crit("%s: Cannot add UDP protocol offload\n", __func__); 1899 if (tcpv4_offload_init() < 0) 1900 pr_crit("%s: Cannot add TCP protocol offload\n", __func__); 1901 if (ipip_offload_init() < 0) 1902 pr_crit("%s: Cannot add IPIP protocol offload\n", __func__); 1903 1904 dev_add_offload(&ip_packet_offload); 1905 return 0; 1906 } 1907 1908 fs_initcall(ipv4_offload_init); 1909 1910 static struct packet_type ip_packet_type __read_mostly = { 1911 .type = cpu_to_be16(ETH_P_IP), 1912 .func = ip_rcv, 1913 .list_func = ip_list_rcv, 1914 }; 1915 1916 static int __init inet_init(void) 1917 { 1918 struct inet_protosw *q; 1919 struct list_head *r; 1920 int rc; 1921 1922 sock_skb_cb_check_size(sizeof(struct inet_skb_parm)); 1923 1924 rc = proto_register(&tcp_prot, 1); 1925 if (rc) 1926 goto out; 1927 1928 rc = proto_register(&udp_prot, 1); 1929 if (rc) 1930 goto out_unregister_tcp_proto; 1931 1932 rc = proto_register(&raw_prot, 1); 1933 if (rc) 1934 goto out_unregister_udp_proto; 1935 1936 rc = proto_register(&ping_prot, 1); 1937 if (rc) 1938 goto out_unregister_raw_proto; 1939 1940 /* 1941 * Tell SOCKET that we are alive... 1942 */ 1943 1944 (void)sock_register(&inet_family_ops); 1945 1946 #ifdef CONFIG_SYSCTL 1947 ip_static_sysctl_init(); 1948 #endif 1949 1950 /* 1951 * Add all the base protocols. 1952 */ 1953 1954 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 1955 pr_crit("%s: Cannot add ICMP protocol\n", __func__); 1956 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) 1957 pr_crit("%s: Cannot add UDP protocol\n", __func__); 1958 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) 1959 pr_crit("%s: Cannot add TCP protocol\n", __func__); 1960 #ifdef CONFIG_IP_MULTICAST 1961 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 1962 pr_crit("%s: Cannot add IGMP protocol\n", __func__); 1963 #endif 1964 1965 /* Register the socket-side information for inet_create. */ 1966 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 1967 INIT_LIST_HEAD(r); 1968 1969 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 1970 inet_register_protosw(q); 1971 1972 /* 1973 * Set the ARP module up 1974 */ 1975 1976 arp_init(); 1977 1978 /* 1979 * Set the IP module up 1980 */ 1981 1982 ip_init(); 1983 1984 /* Setup TCP slab cache for open requests. */ 1985 tcp_init(); 1986 1987 /* Setup UDP memory threshold */ 1988 udp_init(); 1989 1990 /* Add UDP-Lite (RFC 3828) */ 1991 udplite4_register(); 1992 1993 raw_init(); 1994 1995 ping_init(); 1996 1997 /* 1998 * Set the ICMP layer up 1999 */ 2000 2001 if (icmp_init() < 0) 2002 panic("Failed to create the ICMP control socket.\n"); 2003 2004 /* 2005 * Initialise the multicast router 2006 */ 2007 #if defined(CONFIG_IP_MROUTE) 2008 if (ip_mr_init()) 2009 pr_crit("%s: Cannot init ipv4 mroute\n", __func__); 2010 #endif 2011 2012 if (init_inet_pernet_ops()) 2013 pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__); 2014 /* 2015 * Initialise per-cpu ipv4 mibs 2016 */ 2017 2018 if (init_ipv4_mibs()) 2019 pr_crit("%s: Cannot init ipv4 mibs\n", __func__); 2020 2021 ipv4_proc_init(); 2022 2023 ipfrag_init(); 2024 2025 dev_add_pack(&ip_packet_type); 2026 2027 ip_tunnel_core_init(); 2028 2029 rc = 0; 2030 out: 2031 return rc; 2032 out_unregister_raw_proto: 2033 proto_unregister(&raw_prot); 2034 out_unregister_udp_proto: 2035 proto_unregister(&udp_prot); 2036 out_unregister_tcp_proto: 2037 proto_unregister(&tcp_prot); 2038 goto out; 2039 } 2040 2041 fs_initcall(inet_init); 2042 2043 /* ------------------------------------------------------------------------ */ 2044 2045 #ifdef CONFIG_PROC_FS 2046 static int __init ipv4_proc_init(void) 2047 { 2048 int rc = 0; 2049 2050 if (raw_proc_init()) 2051 goto out_raw; 2052 if (tcp4_proc_init()) 2053 goto out_tcp; 2054 if (udp4_proc_init()) 2055 goto out_udp; 2056 if (ping_proc_init()) 2057 goto out_ping; 2058 if (ip_misc_proc_init()) 2059 goto out_misc; 2060 out: 2061 return rc; 2062 out_misc: 2063 ping_proc_exit(); 2064 out_ping: 2065 udp4_proc_exit(); 2066 out_udp: 2067 tcp4_proc_exit(); 2068 out_tcp: 2069 raw_proc_exit(); 2070 out_raw: 2071 rc = -ENOMEM; 2072 goto out; 2073 } 2074 2075 #else /* CONFIG_PROC_FS */ 2076 static int __init ipv4_proc_init(void) 2077 { 2078 return 0; 2079 } 2080 #endif /* CONFIG_PROC_FS */ 2081