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, false, true); 454 } 455 EXPORT_SYMBOL(inet_bind); 456 457 int __inet_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len, 458 bool force_bind_address_no_port, bool with_lock) 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 (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 force_bind_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 err = BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk); 530 if (err) { 531 inet->inet_saddr = inet->inet_rcv_saddr = 0; 532 goto out_release_sock; 533 } 534 } 535 536 if (inet->inet_rcv_saddr) 537 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 538 if (snum) 539 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 540 inet->inet_sport = htons(inet->inet_num); 541 inet->inet_daddr = 0; 542 inet->inet_dport = 0; 543 sk_dst_reset(sk); 544 err = 0; 545 out_release_sock: 546 if (with_lock) 547 release_sock(sk); 548 out: 549 return err; 550 } 551 552 int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr, 553 int addr_len, int flags) 554 { 555 struct sock *sk = sock->sk; 556 int err; 557 558 if (addr_len < sizeof(uaddr->sa_family)) 559 return -EINVAL; 560 if (uaddr->sa_family == AF_UNSPEC) 561 return sk->sk_prot->disconnect(sk, flags); 562 563 if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) { 564 err = sk->sk_prot->pre_connect(sk, uaddr, addr_len); 565 if (err) 566 return err; 567 } 568 569 if (!inet_sk(sk)->inet_num && inet_autobind(sk)) 570 return -EAGAIN; 571 return sk->sk_prot->connect(sk, uaddr, addr_len); 572 } 573 EXPORT_SYMBOL(inet_dgram_connect); 574 575 static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias) 576 { 577 DEFINE_WAIT_FUNC(wait, woken_wake_function); 578 579 add_wait_queue(sk_sleep(sk), &wait); 580 sk->sk_write_pending += writebias; 581 582 /* Basic assumption: if someone sets sk->sk_err, he _must_ 583 * change state of the socket from TCP_SYN_*. 584 * Connect() does not allow to get error notifications 585 * without closing the socket. 586 */ 587 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 588 release_sock(sk); 589 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo); 590 lock_sock(sk); 591 if (signal_pending(current) || !timeo) 592 break; 593 } 594 remove_wait_queue(sk_sleep(sk), &wait); 595 sk->sk_write_pending -= writebias; 596 return timeo; 597 } 598 599 /* 600 * Connect to a remote host. There is regrettably still a little 601 * TCP 'magic' in here. 602 */ 603 int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 604 int addr_len, int flags, int is_sendmsg) 605 { 606 struct sock *sk = sock->sk; 607 int err; 608 long timeo; 609 610 /* 611 * uaddr can be NULL and addr_len can be 0 if: 612 * sk is a TCP fastopen active socket and 613 * TCP_FASTOPEN_CONNECT sockopt is set and 614 * we already have a valid cookie for this socket. 615 * In this case, user can call write() after connect(). 616 * write() will invoke tcp_sendmsg_fastopen() which calls 617 * __inet_stream_connect(). 618 */ 619 if (uaddr) { 620 if (addr_len < sizeof(uaddr->sa_family)) 621 return -EINVAL; 622 623 if (uaddr->sa_family == AF_UNSPEC) { 624 err = sk->sk_prot->disconnect(sk, flags); 625 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 626 goto out; 627 } 628 } 629 630 switch (sock->state) { 631 default: 632 err = -EINVAL; 633 goto out; 634 case SS_CONNECTED: 635 err = -EISCONN; 636 goto out; 637 case SS_CONNECTING: 638 if (inet_sk(sk)->defer_connect) 639 err = is_sendmsg ? -EINPROGRESS : -EISCONN; 640 else 641 err = -EALREADY; 642 /* Fall out of switch with err, set for this state */ 643 break; 644 case SS_UNCONNECTED: 645 err = -EISCONN; 646 if (sk->sk_state != TCP_CLOSE) 647 goto out; 648 649 if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) { 650 err = sk->sk_prot->pre_connect(sk, uaddr, addr_len); 651 if (err) 652 goto out; 653 } 654 655 err = sk->sk_prot->connect(sk, uaddr, addr_len); 656 if (err < 0) 657 goto out; 658 659 sock->state = SS_CONNECTING; 660 661 if (!err && inet_sk(sk)->defer_connect) 662 goto out; 663 664 /* Just entered SS_CONNECTING state; the only 665 * difference is that return value in non-blocking 666 * case is EINPROGRESS, rather than EALREADY. 667 */ 668 err = -EINPROGRESS; 669 break; 670 } 671 672 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 673 674 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 675 int writebias = (sk->sk_protocol == IPPROTO_TCP) && 676 tcp_sk(sk)->fastopen_req && 677 tcp_sk(sk)->fastopen_req->data ? 1 : 0; 678 679 /* Error code is set above */ 680 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias)) 681 goto out; 682 683 err = sock_intr_errno(timeo); 684 if (signal_pending(current)) 685 goto out; 686 } 687 688 /* Connection was closed by RST, timeout, ICMP error 689 * or another process disconnected us. 690 */ 691 if (sk->sk_state == TCP_CLOSE) 692 goto sock_error; 693 694 /* sk->sk_err may be not zero now, if RECVERR was ordered by user 695 * and error was received after socket entered established state. 696 * Hence, it is handled normally after connect() return successfully. 697 */ 698 699 sock->state = SS_CONNECTED; 700 err = 0; 701 out: 702 return err; 703 704 sock_error: 705 err = sock_error(sk) ? : -ECONNABORTED; 706 sock->state = SS_UNCONNECTED; 707 if (sk->sk_prot->disconnect(sk, flags)) 708 sock->state = SS_DISCONNECTING; 709 goto out; 710 } 711 EXPORT_SYMBOL(__inet_stream_connect); 712 713 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 714 int addr_len, int flags) 715 { 716 int err; 717 718 lock_sock(sock->sk); 719 err = __inet_stream_connect(sock, uaddr, addr_len, flags, 0); 720 release_sock(sock->sk); 721 return err; 722 } 723 EXPORT_SYMBOL(inet_stream_connect); 724 725 /* 726 * Accept a pending connection. The TCP layer now gives BSD semantics. 727 */ 728 729 int inet_accept(struct socket *sock, struct socket *newsock, int flags, 730 bool kern) 731 { 732 struct sock *sk1 = sock->sk; 733 int err = -EINVAL; 734 struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err, kern); 735 736 if (!sk2) 737 goto do_err; 738 739 lock_sock(sk2); 740 741 sock_rps_record_flow(sk2); 742 WARN_ON(!((1 << sk2->sk_state) & 743 (TCPF_ESTABLISHED | TCPF_SYN_RECV | 744 TCPF_CLOSE_WAIT | TCPF_CLOSE))); 745 746 sock_graft(sk2, newsock); 747 748 newsock->state = SS_CONNECTED; 749 err = 0; 750 release_sock(sk2); 751 do_err: 752 return err; 753 } 754 EXPORT_SYMBOL(inet_accept); 755 756 757 /* 758 * This does both peername and sockname. 759 */ 760 int inet_getname(struct socket *sock, struct sockaddr *uaddr, 761 int peer) 762 { 763 struct sock *sk = sock->sk; 764 struct inet_sock *inet = inet_sk(sk); 765 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr); 766 767 sin->sin_family = AF_INET; 768 if (peer) { 769 if (!inet->inet_dport || 770 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 771 peer == 1)) 772 return -ENOTCONN; 773 sin->sin_port = inet->inet_dport; 774 sin->sin_addr.s_addr = inet->inet_daddr; 775 } else { 776 __be32 addr = inet->inet_rcv_saddr; 777 if (!addr) 778 addr = inet->inet_saddr; 779 sin->sin_port = inet->inet_sport; 780 sin->sin_addr.s_addr = addr; 781 } 782 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 783 return sizeof(*sin); 784 } 785 EXPORT_SYMBOL(inet_getname); 786 787 int inet_send_prepare(struct sock *sk) 788 { 789 sock_rps_record_flow(sk); 790 791 /* We may need to bind the socket. */ 792 if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 793 inet_autobind(sk)) 794 return -EAGAIN; 795 796 return 0; 797 } 798 EXPORT_SYMBOL_GPL(inet_send_prepare); 799 800 int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) 801 { 802 struct sock *sk = sock->sk; 803 804 if (unlikely(inet_send_prepare(sk))) 805 return -EAGAIN; 806 807 return INDIRECT_CALL_2(sk->sk_prot->sendmsg, tcp_sendmsg, udp_sendmsg, 808 sk, msg, size); 809 } 810 EXPORT_SYMBOL(inet_sendmsg); 811 812 ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, 813 size_t size, int flags) 814 { 815 struct sock *sk = sock->sk; 816 817 if (unlikely(inet_send_prepare(sk))) 818 return -EAGAIN; 819 820 if (sk->sk_prot->sendpage) 821 return sk->sk_prot->sendpage(sk, page, offset, size, flags); 822 return sock_no_sendpage(sock, page, offset, size, flags); 823 } 824 EXPORT_SYMBOL(inet_sendpage); 825 826 INDIRECT_CALLABLE_DECLARE(int udp_recvmsg(struct sock *, struct msghdr *, 827 size_t, int, int, int *)); 828 int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 829 int flags) 830 { 831 struct sock *sk = sock->sk; 832 int addr_len = 0; 833 int err; 834 835 if (likely(!(flags & MSG_ERRQUEUE))) 836 sock_rps_record_flow(sk); 837 838 err = INDIRECT_CALL_2(sk->sk_prot->recvmsg, tcp_recvmsg, udp_recvmsg, 839 sk, msg, size, flags & MSG_DONTWAIT, 840 flags & ~MSG_DONTWAIT, &addr_len); 841 if (err >= 0) 842 msg->msg_namelen = addr_len; 843 return err; 844 } 845 EXPORT_SYMBOL(inet_recvmsg); 846 847 int inet_shutdown(struct socket *sock, int how) 848 { 849 struct sock *sk = sock->sk; 850 int err = 0; 851 852 /* This should really check to make sure 853 * the socket is a TCP socket. (WHY AC...) 854 */ 855 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and 856 1->2 bit 2 snds. 857 2->3 */ 858 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ 859 return -EINVAL; 860 861 lock_sock(sk); 862 if (sock->state == SS_CONNECTING) { 863 if ((1 << sk->sk_state) & 864 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) 865 sock->state = SS_DISCONNECTING; 866 else 867 sock->state = SS_CONNECTED; 868 } 869 870 switch (sk->sk_state) { 871 case TCP_CLOSE: 872 err = -ENOTCONN; 873 /* Hack to wake up other listeners, who can poll for 874 EPOLLHUP, even on eg. unconnected UDP sockets -- RR */ 875 fallthrough; 876 default: 877 sk->sk_shutdown |= how; 878 if (sk->sk_prot->shutdown) 879 sk->sk_prot->shutdown(sk, how); 880 break; 881 882 /* Remaining two branches are temporary solution for missing 883 * close() in multithreaded environment. It is _not_ a good idea, 884 * but we have no choice until close() is repaired at VFS level. 885 */ 886 case TCP_LISTEN: 887 if (!(how & RCV_SHUTDOWN)) 888 break; 889 fallthrough; 890 case TCP_SYN_SENT: 891 err = sk->sk_prot->disconnect(sk, O_NONBLOCK); 892 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 893 break; 894 } 895 896 /* Wake up anyone sleeping in poll. */ 897 sk->sk_state_change(sk); 898 release_sock(sk); 899 return err; 900 } 901 EXPORT_SYMBOL(inet_shutdown); 902 903 /* 904 * ioctl() calls you can issue on an INET socket. Most of these are 905 * device configuration and stuff and very rarely used. Some ioctls 906 * pass on to the socket itself. 907 * 908 * NOTE: I like the idea of a module for the config stuff. ie ifconfig 909 * loads the devconfigure module does its configuring and unloads it. 910 * There's a good 20K of config code hanging around the kernel. 911 */ 912 913 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 914 { 915 struct sock *sk = sock->sk; 916 int err = 0; 917 struct net *net = sock_net(sk); 918 void __user *p = (void __user *)arg; 919 struct ifreq ifr; 920 struct rtentry rt; 921 922 switch (cmd) { 923 case SIOCADDRT: 924 case SIOCDELRT: 925 if (copy_from_user(&rt, p, sizeof(struct rtentry))) 926 return -EFAULT; 927 err = ip_rt_ioctl(net, cmd, &rt); 928 break; 929 case SIOCRTMSG: 930 err = -EINVAL; 931 break; 932 case SIOCDARP: 933 case SIOCGARP: 934 case SIOCSARP: 935 err = arp_ioctl(net, cmd, (void __user *)arg); 936 break; 937 case SIOCGIFADDR: 938 case SIOCGIFBRDADDR: 939 case SIOCGIFNETMASK: 940 case SIOCGIFDSTADDR: 941 case SIOCGIFPFLAGS: 942 if (copy_from_user(&ifr, p, sizeof(struct ifreq))) 943 return -EFAULT; 944 err = devinet_ioctl(net, cmd, &ifr); 945 if (!err && copy_to_user(p, &ifr, sizeof(struct ifreq))) 946 err = -EFAULT; 947 break; 948 949 case SIOCSIFADDR: 950 case SIOCSIFBRDADDR: 951 case SIOCSIFNETMASK: 952 case SIOCSIFDSTADDR: 953 case SIOCSIFPFLAGS: 954 case SIOCSIFFLAGS: 955 if (copy_from_user(&ifr, p, sizeof(struct ifreq))) 956 return -EFAULT; 957 err = devinet_ioctl(net, cmd, &ifr); 958 break; 959 default: 960 if (sk->sk_prot->ioctl) 961 err = sk->sk_prot->ioctl(sk, cmd, arg); 962 else 963 err = -ENOIOCTLCMD; 964 break; 965 } 966 return err; 967 } 968 EXPORT_SYMBOL(inet_ioctl); 969 970 #ifdef CONFIG_COMPAT 971 static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 972 { 973 struct sock *sk = sock->sk; 974 int err = -ENOIOCTLCMD; 975 976 if (sk->sk_prot->compat_ioctl) 977 err = sk->sk_prot->compat_ioctl(sk, cmd, arg); 978 979 return err; 980 } 981 #endif 982 983 const struct proto_ops inet_stream_ops = { 984 .family = PF_INET, 985 .owner = THIS_MODULE, 986 .release = inet_release, 987 .bind = inet_bind, 988 .connect = inet_stream_connect, 989 .socketpair = sock_no_socketpair, 990 .accept = inet_accept, 991 .getname = inet_getname, 992 .poll = tcp_poll, 993 .ioctl = inet_ioctl, 994 .gettstamp = sock_gettstamp, 995 .listen = inet_listen, 996 .shutdown = inet_shutdown, 997 .setsockopt = sock_common_setsockopt, 998 .getsockopt = sock_common_getsockopt, 999 .sendmsg = inet_sendmsg, 1000 .recvmsg = inet_recvmsg, 1001 #ifdef CONFIG_MMU 1002 .mmap = tcp_mmap, 1003 #endif 1004 .sendpage = inet_sendpage, 1005 .splice_read = tcp_splice_read, 1006 .read_sock = tcp_read_sock, 1007 .sendmsg_locked = tcp_sendmsg_locked, 1008 .sendpage_locked = tcp_sendpage_locked, 1009 .peek_len = tcp_peek_len, 1010 #ifdef CONFIG_COMPAT 1011 .compat_setsockopt = compat_sock_common_setsockopt, 1012 .compat_getsockopt = compat_sock_common_getsockopt, 1013 .compat_ioctl = inet_compat_ioctl, 1014 #endif 1015 .set_rcvlowat = tcp_set_rcvlowat, 1016 }; 1017 EXPORT_SYMBOL(inet_stream_ops); 1018 1019 const struct proto_ops inet_dgram_ops = { 1020 .family = PF_INET, 1021 .owner = THIS_MODULE, 1022 .release = inet_release, 1023 .bind = inet_bind, 1024 .connect = inet_dgram_connect, 1025 .socketpair = sock_no_socketpair, 1026 .accept = sock_no_accept, 1027 .getname = inet_getname, 1028 .poll = udp_poll, 1029 .ioctl = inet_ioctl, 1030 .gettstamp = sock_gettstamp, 1031 .listen = sock_no_listen, 1032 .shutdown = inet_shutdown, 1033 .setsockopt = sock_common_setsockopt, 1034 .getsockopt = sock_common_getsockopt, 1035 .sendmsg = inet_sendmsg, 1036 .recvmsg = inet_recvmsg, 1037 .mmap = sock_no_mmap, 1038 .sendpage = inet_sendpage, 1039 .set_peek_off = sk_set_peek_off, 1040 #ifdef CONFIG_COMPAT 1041 .compat_setsockopt = compat_sock_common_setsockopt, 1042 .compat_getsockopt = compat_sock_common_getsockopt, 1043 .compat_ioctl = inet_compat_ioctl, 1044 #endif 1045 }; 1046 EXPORT_SYMBOL(inet_dgram_ops); 1047 1048 /* 1049 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 1050 * udp_poll 1051 */ 1052 static const struct proto_ops inet_sockraw_ops = { 1053 .family = PF_INET, 1054 .owner = THIS_MODULE, 1055 .release = inet_release, 1056 .bind = inet_bind, 1057 .connect = inet_dgram_connect, 1058 .socketpair = sock_no_socketpair, 1059 .accept = sock_no_accept, 1060 .getname = inet_getname, 1061 .poll = datagram_poll, 1062 .ioctl = inet_ioctl, 1063 .gettstamp = sock_gettstamp, 1064 .listen = sock_no_listen, 1065 .shutdown = inet_shutdown, 1066 .setsockopt = sock_common_setsockopt, 1067 .getsockopt = sock_common_getsockopt, 1068 .sendmsg = inet_sendmsg, 1069 .recvmsg = inet_recvmsg, 1070 .mmap = sock_no_mmap, 1071 .sendpage = inet_sendpage, 1072 #ifdef CONFIG_COMPAT 1073 .compat_setsockopt = compat_sock_common_setsockopt, 1074 .compat_getsockopt = compat_sock_common_getsockopt, 1075 .compat_ioctl = inet_compat_ioctl, 1076 #endif 1077 }; 1078 1079 static const struct net_proto_family inet_family_ops = { 1080 .family = PF_INET, 1081 .create = inet_create, 1082 .owner = THIS_MODULE, 1083 }; 1084 1085 /* Upon startup we insert all the elements in inetsw_array[] into 1086 * the linked list inetsw. 1087 */ 1088 static struct inet_protosw inetsw_array[] = 1089 { 1090 { 1091 .type = SOCK_STREAM, 1092 .protocol = IPPROTO_TCP, 1093 .prot = &tcp_prot, 1094 .ops = &inet_stream_ops, 1095 .flags = INET_PROTOSW_PERMANENT | 1096 INET_PROTOSW_ICSK, 1097 }, 1098 1099 { 1100 .type = SOCK_DGRAM, 1101 .protocol = IPPROTO_UDP, 1102 .prot = &udp_prot, 1103 .ops = &inet_dgram_ops, 1104 .flags = INET_PROTOSW_PERMANENT, 1105 }, 1106 1107 { 1108 .type = SOCK_DGRAM, 1109 .protocol = IPPROTO_ICMP, 1110 .prot = &ping_prot, 1111 .ops = &inet_sockraw_ops, 1112 .flags = INET_PROTOSW_REUSE, 1113 }, 1114 1115 { 1116 .type = SOCK_RAW, 1117 .protocol = IPPROTO_IP, /* wild card */ 1118 .prot = &raw_prot, 1119 .ops = &inet_sockraw_ops, 1120 .flags = INET_PROTOSW_REUSE, 1121 } 1122 }; 1123 1124 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) 1125 1126 void inet_register_protosw(struct inet_protosw *p) 1127 { 1128 struct list_head *lh; 1129 struct inet_protosw *answer; 1130 int protocol = p->protocol; 1131 struct list_head *last_perm; 1132 1133 spin_lock_bh(&inetsw_lock); 1134 1135 if (p->type >= SOCK_MAX) 1136 goto out_illegal; 1137 1138 /* If we are trying to override a permanent protocol, bail. */ 1139 last_perm = &inetsw[p->type]; 1140 list_for_each(lh, &inetsw[p->type]) { 1141 answer = list_entry(lh, struct inet_protosw, list); 1142 /* Check only the non-wild match. */ 1143 if ((INET_PROTOSW_PERMANENT & answer->flags) == 0) 1144 break; 1145 if (protocol == answer->protocol) 1146 goto out_permanent; 1147 last_perm = lh; 1148 } 1149 1150 /* Add the new entry after the last permanent entry if any, so that 1151 * the new entry does not override a permanent entry when matched with 1152 * a wild-card protocol. But it is allowed to override any existing 1153 * non-permanent entry. This means that when we remove this entry, the 1154 * system automatically returns to the old behavior. 1155 */ 1156 list_add_rcu(&p->list, last_perm); 1157 out: 1158 spin_unlock_bh(&inetsw_lock); 1159 1160 return; 1161 1162 out_permanent: 1163 pr_err("Attempt to override permanent protocol %d\n", protocol); 1164 goto out; 1165 1166 out_illegal: 1167 pr_err("Ignoring attempt to register invalid socket type %d\n", 1168 p->type); 1169 goto out; 1170 } 1171 EXPORT_SYMBOL(inet_register_protosw); 1172 1173 void inet_unregister_protosw(struct inet_protosw *p) 1174 { 1175 if (INET_PROTOSW_PERMANENT & p->flags) { 1176 pr_err("Attempt to unregister permanent protocol %d\n", 1177 p->protocol); 1178 } else { 1179 spin_lock_bh(&inetsw_lock); 1180 list_del_rcu(&p->list); 1181 spin_unlock_bh(&inetsw_lock); 1182 1183 synchronize_net(); 1184 } 1185 } 1186 EXPORT_SYMBOL(inet_unregister_protosw); 1187 1188 static int inet_sk_reselect_saddr(struct sock *sk) 1189 { 1190 struct inet_sock *inet = inet_sk(sk); 1191 __be32 old_saddr = inet->inet_saddr; 1192 __be32 daddr = inet->inet_daddr; 1193 struct flowi4 *fl4; 1194 struct rtable *rt; 1195 __be32 new_saddr; 1196 struct ip_options_rcu *inet_opt; 1197 1198 inet_opt = rcu_dereference_protected(inet->inet_opt, 1199 lockdep_sock_is_held(sk)); 1200 if (inet_opt && inet_opt->opt.srr) 1201 daddr = inet_opt->opt.faddr; 1202 1203 /* Query new route. */ 1204 fl4 = &inet->cork.fl.u.ip4; 1205 rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk), 1206 sk->sk_bound_dev_if, sk->sk_protocol, 1207 inet->inet_sport, inet->inet_dport, sk); 1208 if (IS_ERR(rt)) 1209 return PTR_ERR(rt); 1210 1211 sk_setup_caps(sk, &rt->dst); 1212 1213 new_saddr = fl4->saddr; 1214 1215 if (new_saddr == old_saddr) 1216 return 0; 1217 1218 if (sock_net(sk)->ipv4.sysctl_ip_dynaddr > 1) { 1219 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n", 1220 __func__, &old_saddr, &new_saddr); 1221 } 1222 1223 inet->inet_saddr = inet->inet_rcv_saddr = new_saddr; 1224 1225 /* 1226 * XXX The only one ugly spot where we need to 1227 * XXX really change the sockets identity after 1228 * XXX it has entered the hashes. -DaveM 1229 * 1230 * Besides that, it does not check for connection 1231 * uniqueness. Wait for troubles. 1232 */ 1233 return __sk_prot_rehash(sk); 1234 } 1235 1236 int inet_sk_rebuild_header(struct sock *sk) 1237 { 1238 struct inet_sock *inet = inet_sk(sk); 1239 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); 1240 __be32 daddr; 1241 struct ip_options_rcu *inet_opt; 1242 struct flowi4 *fl4; 1243 int err; 1244 1245 /* Route is OK, nothing to do. */ 1246 if (rt) 1247 return 0; 1248 1249 /* Reroute. */ 1250 rcu_read_lock(); 1251 inet_opt = rcu_dereference(inet->inet_opt); 1252 daddr = inet->inet_daddr; 1253 if (inet_opt && inet_opt->opt.srr) 1254 daddr = inet_opt->opt.faddr; 1255 rcu_read_unlock(); 1256 fl4 = &inet->cork.fl.u.ip4; 1257 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr, 1258 inet->inet_dport, inet->inet_sport, 1259 sk->sk_protocol, RT_CONN_FLAGS(sk), 1260 sk->sk_bound_dev_if); 1261 if (!IS_ERR(rt)) { 1262 err = 0; 1263 sk_setup_caps(sk, &rt->dst); 1264 } else { 1265 err = PTR_ERR(rt); 1266 1267 /* Routing failed... */ 1268 sk->sk_route_caps = 0; 1269 /* 1270 * Other protocols have to map its equivalent state to TCP_SYN_SENT. 1271 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme 1272 */ 1273 if (!sock_net(sk)->ipv4.sysctl_ip_dynaddr || 1274 sk->sk_state != TCP_SYN_SENT || 1275 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 1276 (err = inet_sk_reselect_saddr(sk)) != 0) 1277 sk->sk_err_soft = -err; 1278 } 1279 1280 return err; 1281 } 1282 EXPORT_SYMBOL(inet_sk_rebuild_header); 1283 1284 void inet_sk_set_state(struct sock *sk, int state) 1285 { 1286 trace_inet_sock_set_state(sk, sk->sk_state, state); 1287 sk->sk_state = state; 1288 } 1289 EXPORT_SYMBOL(inet_sk_set_state); 1290 1291 void inet_sk_state_store(struct sock *sk, int newstate) 1292 { 1293 trace_inet_sock_set_state(sk, sk->sk_state, newstate); 1294 smp_store_release(&sk->sk_state, newstate); 1295 } 1296 1297 struct sk_buff *inet_gso_segment(struct sk_buff *skb, 1298 netdev_features_t features) 1299 { 1300 bool udpfrag = false, fixedid = false, gso_partial, encap; 1301 struct sk_buff *segs = ERR_PTR(-EINVAL); 1302 const struct net_offload *ops; 1303 unsigned int offset = 0; 1304 struct iphdr *iph; 1305 int proto, tot_len; 1306 int nhoff; 1307 int ihl; 1308 int id; 1309 1310 skb_reset_network_header(skb); 1311 nhoff = skb_network_header(skb) - skb_mac_header(skb); 1312 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1313 goto out; 1314 1315 iph = ip_hdr(skb); 1316 ihl = iph->ihl * 4; 1317 if (ihl < sizeof(*iph)) 1318 goto out; 1319 1320 id = ntohs(iph->id); 1321 proto = iph->protocol; 1322 1323 /* Warning: after this point, iph might be no longer valid */ 1324 if (unlikely(!pskb_may_pull(skb, ihl))) 1325 goto out; 1326 __skb_pull(skb, ihl); 1327 1328 encap = SKB_GSO_CB(skb)->encap_level > 0; 1329 if (encap) 1330 features &= skb->dev->hw_enc_features; 1331 SKB_GSO_CB(skb)->encap_level += ihl; 1332 1333 skb_reset_transport_header(skb); 1334 1335 segs = ERR_PTR(-EPROTONOSUPPORT); 1336 1337 if (!skb->encapsulation || encap) { 1338 udpfrag = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP); 1339 fixedid = !!(skb_shinfo(skb)->gso_type & SKB_GSO_TCP_FIXEDID); 1340 1341 /* fixed ID is invalid if DF bit is not set */ 1342 if (fixedid && !(ip_hdr(skb)->frag_off & htons(IP_DF))) 1343 goto out; 1344 } 1345 1346 ops = rcu_dereference(inet_offloads[proto]); 1347 if (likely(ops && ops->callbacks.gso_segment)) 1348 segs = ops->callbacks.gso_segment(skb, features); 1349 1350 if (IS_ERR_OR_NULL(segs)) 1351 goto out; 1352 1353 gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL); 1354 1355 skb = segs; 1356 do { 1357 iph = (struct iphdr *)(skb_mac_header(skb) + nhoff); 1358 if (udpfrag) { 1359 iph->frag_off = htons(offset >> 3); 1360 if (skb->next) 1361 iph->frag_off |= htons(IP_MF); 1362 offset += skb->len - nhoff - ihl; 1363 tot_len = skb->len - nhoff; 1364 } else if (skb_is_gso(skb)) { 1365 if (!fixedid) { 1366 iph->id = htons(id); 1367 id += skb_shinfo(skb)->gso_segs; 1368 } 1369 1370 if (gso_partial) 1371 tot_len = skb_shinfo(skb)->gso_size + 1372 SKB_GSO_CB(skb)->data_offset + 1373 skb->head - (unsigned char *)iph; 1374 else 1375 tot_len = skb->len - nhoff; 1376 } else { 1377 if (!fixedid) 1378 iph->id = htons(id++); 1379 tot_len = skb->len - nhoff; 1380 } 1381 iph->tot_len = htons(tot_len); 1382 ip_send_check(iph); 1383 if (encap) 1384 skb_reset_inner_headers(skb); 1385 skb->network_header = (u8 *)iph - skb->head; 1386 skb_reset_mac_len(skb); 1387 } while ((skb = skb->next)); 1388 1389 out: 1390 return segs; 1391 } 1392 EXPORT_SYMBOL(inet_gso_segment); 1393 1394 static struct sk_buff *ipip_gso_segment(struct sk_buff *skb, 1395 netdev_features_t features) 1396 { 1397 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_IPXIP4)) 1398 return ERR_PTR(-EINVAL); 1399 1400 return inet_gso_segment(skb, features); 1401 } 1402 1403 INDIRECT_CALLABLE_DECLARE(struct sk_buff *tcp4_gro_receive(struct list_head *, 1404 struct sk_buff *)); 1405 INDIRECT_CALLABLE_DECLARE(struct sk_buff *udp4_gro_receive(struct list_head *, 1406 struct sk_buff *)); 1407 struct sk_buff *inet_gro_receive(struct list_head *head, struct sk_buff *skb) 1408 { 1409 const struct net_offload *ops; 1410 struct sk_buff *pp = NULL; 1411 const struct iphdr *iph; 1412 struct sk_buff *p; 1413 unsigned int hlen; 1414 unsigned int off; 1415 unsigned int id; 1416 int flush = 1; 1417 int proto; 1418 1419 off = skb_gro_offset(skb); 1420 hlen = off + sizeof(*iph); 1421 iph = skb_gro_header_fast(skb, off); 1422 if (skb_gro_header_hard(skb, hlen)) { 1423 iph = skb_gro_header_slow(skb, hlen, off); 1424 if (unlikely(!iph)) 1425 goto out; 1426 } 1427 1428 proto = iph->protocol; 1429 1430 rcu_read_lock(); 1431 ops = rcu_dereference(inet_offloads[proto]); 1432 if (!ops || !ops->callbacks.gro_receive) 1433 goto out_unlock; 1434 1435 if (*(u8 *)iph != 0x45) 1436 goto out_unlock; 1437 1438 if (ip_is_fragment(iph)) 1439 goto out_unlock; 1440 1441 if (unlikely(ip_fast_csum((u8 *)iph, 5))) 1442 goto out_unlock; 1443 1444 id = ntohl(*(__be32 *)&iph->id); 1445 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF)); 1446 id >>= 16; 1447 1448 list_for_each_entry(p, head, list) { 1449 struct iphdr *iph2; 1450 u16 flush_id; 1451 1452 if (!NAPI_GRO_CB(p)->same_flow) 1453 continue; 1454 1455 iph2 = (struct iphdr *)(p->data + off); 1456 /* The above works because, with the exception of the top 1457 * (inner most) layer, we only aggregate pkts with the same 1458 * hdr length so all the hdrs we'll need to verify will start 1459 * at the same offset. 1460 */ 1461 if ((iph->protocol ^ iph2->protocol) | 1462 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) | 1463 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) { 1464 NAPI_GRO_CB(p)->same_flow = 0; 1465 continue; 1466 } 1467 1468 /* All fields must match except length and checksum. */ 1469 NAPI_GRO_CB(p)->flush |= 1470 (iph->ttl ^ iph2->ttl) | 1471 (iph->tos ^ iph2->tos) | 1472 ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF)); 1473 1474 NAPI_GRO_CB(p)->flush |= flush; 1475 1476 /* We need to store of the IP ID check to be included later 1477 * when we can verify that this packet does in fact belong 1478 * to a given flow. 1479 */ 1480 flush_id = (u16)(id - ntohs(iph2->id)); 1481 1482 /* This bit of code makes it much easier for us to identify 1483 * the cases where we are doing atomic vs non-atomic IP ID 1484 * checks. Specifically an atomic check can return IP ID 1485 * values 0 - 0xFFFF, while a non-atomic check can only 1486 * return 0 or 0xFFFF. 1487 */ 1488 if (!NAPI_GRO_CB(p)->is_atomic || 1489 !(iph->frag_off & htons(IP_DF))) { 1490 flush_id ^= NAPI_GRO_CB(p)->count; 1491 flush_id = flush_id ? 0xFFFF : 0; 1492 } 1493 1494 /* If the previous IP ID value was based on an atomic 1495 * datagram we can overwrite the value and ignore it. 1496 */ 1497 if (NAPI_GRO_CB(skb)->is_atomic) 1498 NAPI_GRO_CB(p)->flush_id = flush_id; 1499 else 1500 NAPI_GRO_CB(p)->flush_id |= flush_id; 1501 } 1502 1503 NAPI_GRO_CB(skb)->is_atomic = !!(iph->frag_off & htons(IP_DF)); 1504 NAPI_GRO_CB(skb)->flush |= flush; 1505 skb_set_network_header(skb, off); 1506 /* The above will be needed by the transport layer if there is one 1507 * immediately following this IP hdr. 1508 */ 1509 1510 /* Note : No need to call skb_gro_postpull_rcsum() here, 1511 * as we already checked checksum over ipv4 header was 0 1512 */ 1513 skb_gro_pull(skb, sizeof(*iph)); 1514 skb_set_transport_header(skb, skb_gro_offset(skb)); 1515 1516 pp = indirect_call_gro_receive(tcp4_gro_receive, udp4_gro_receive, 1517 ops->callbacks.gro_receive, head, skb); 1518 1519 out_unlock: 1520 rcu_read_unlock(); 1521 1522 out: 1523 skb_gro_flush_final(skb, pp, flush); 1524 1525 return pp; 1526 } 1527 EXPORT_SYMBOL(inet_gro_receive); 1528 1529 static struct sk_buff *ipip_gro_receive(struct list_head *head, 1530 struct sk_buff *skb) 1531 { 1532 if (NAPI_GRO_CB(skb)->encap_mark) { 1533 NAPI_GRO_CB(skb)->flush = 1; 1534 return NULL; 1535 } 1536 1537 NAPI_GRO_CB(skb)->encap_mark = 1; 1538 1539 return inet_gro_receive(head, skb); 1540 } 1541 1542 #define SECONDS_PER_DAY 86400 1543 1544 /* inet_current_timestamp - Return IP network timestamp 1545 * 1546 * Return milliseconds since midnight in network byte order. 1547 */ 1548 __be32 inet_current_timestamp(void) 1549 { 1550 u32 secs; 1551 u32 msecs; 1552 struct timespec64 ts; 1553 1554 ktime_get_real_ts64(&ts); 1555 1556 /* Get secs since midnight. */ 1557 (void)div_u64_rem(ts.tv_sec, SECONDS_PER_DAY, &secs); 1558 /* Convert to msecs. */ 1559 msecs = secs * MSEC_PER_SEC; 1560 /* Convert nsec to msec. */ 1561 msecs += (u32)ts.tv_nsec / NSEC_PER_MSEC; 1562 1563 /* Convert to network byte order. */ 1564 return htonl(msecs); 1565 } 1566 EXPORT_SYMBOL(inet_current_timestamp); 1567 1568 int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 1569 { 1570 if (sk->sk_family == AF_INET) 1571 return ip_recv_error(sk, msg, len, addr_len); 1572 #if IS_ENABLED(CONFIG_IPV6) 1573 if (sk->sk_family == AF_INET6) 1574 return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len); 1575 #endif 1576 return -EINVAL; 1577 } 1578 1579 INDIRECT_CALLABLE_DECLARE(int tcp4_gro_complete(struct sk_buff *, int)); 1580 INDIRECT_CALLABLE_DECLARE(int udp4_gro_complete(struct sk_buff *, int)); 1581 int inet_gro_complete(struct sk_buff *skb, int nhoff) 1582 { 1583 __be16 newlen = htons(skb->len - nhoff); 1584 struct iphdr *iph = (struct iphdr *)(skb->data + nhoff); 1585 const struct net_offload *ops; 1586 int proto = iph->protocol; 1587 int err = -ENOSYS; 1588 1589 if (skb->encapsulation) { 1590 skb_set_inner_protocol(skb, cpu_to_be16(ETH_P_IP)); 1591 skb_set_inner_network_header(skb, nhoff); 1592 } 1593 1594 csum_replace2(&iph->check, iph->tot_len, newlen); 1595 iph->tot_len = newlen; 1596 1597 rcu_read_lock(); 1598 ops = rcu_dereference(inet_offloads[proto]); 1599 if (WARN_ON(!ops || !ops->callbacks.gro_complete)) 1600 goto out_unlock; 1601 1602 /* Only need to add sizeof(*iph) to get to the next hdr below 1603 * because any hdr with option will have been flushed in 1604 * inet_gro_receive(). 1605 */ 1606 err = INDIRECT_CALL_2(ops->callbacks.gro_complete, 1607 tcp4_gro_complete, udp4_gro_complete, 1608 skb, nhoff + sizeof(*iph)); 1609 1610 out_unlock: 1611 rcu_read_unlock(); 1612 1613 return err; 1614 } 1615 EXPORT_SYMBOL(inet_gro_complete); 1616 1617 static int ipip_gro_complete(struct sk_buff *skb, int nhoff) 1618 { 1619 skb->encapsulation = 1; 1620 skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4; 1621 return inet_gro_complete(skb, nhoff); 1622 } 1623 1624 int inet_ctl_sock_create(struct sock **sk, unsigned short family, 1625 unsigned short type, unsigned char protocol, 1626 struct net *net) 1627 { 1628 struct socket *sock; 1629 int rc = sock_create_kern(net, family, type, protocol, &sock); 1630 1631 if (rc == 0) { 1632 *sk = sock->sk; 1633 (*sk)->sk_allocation = GFP_ATOMIC; 1634 /* 1635 * Unhash it so that IP input processing does not even see it, 1636 * we do not wish this socket to see incoming packets. 1637 */ 1638 (*sk)->sk_prot->unhash(*sk); 1639 } 1640 return rc; 1641 } 1642 EXPORT_SYMBOL_GPL(inet_ctl_sock_create); 1643 1644 u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offt) 1645 { 1646 return *(((unsigned long *)per_cpu_ptr(mib, cpu)) + offt); 1647 } 1648 EXPORT_SYMBOL_GPL(snmp_get_cpu_field); 1649 1650 unsigned long snmp_fold_field(void __percpu *mib, int offt) 1651 { 1652 unsigned long res = 0; 1653 int i; 1654 1655 for_each_possible_cpu(i) 1656 res += snmp_get_cpu_field(mib, i, offt); 1657 return res; 1658 } 1659 EXPORT_SYMBOL_GPL(snmp_fold_field); 1660 1661 #if BITS_PER_LONG==32 1662 1663 u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offt, 1664 size_t syncp_offset) 1665 { 1666 void *bhptr; 1667 struct u64_stats_sync *syncp; 1668 u64 v; 1669 unsigned int start; 1670 1671 bhptr = per_cpu_ptr(mib, cpu); 1672 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset); 1673 do { 1674 start = u64_stats_fetch_begin_irq(syncp); 1675 v = *(((u64 *)bhptr) + offt); 1676 } while (u64_stats_fetch_retry_irq(syncp, start)); 1677 1678 return v; 1679 } 1680 EXPORT_SYMBOL_GPL(snmp_get_cpu_field64); 1681 1682 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset) 1683 { 1684 u64 res = 0; 1685 int cpu; 1686 1687 for_each_possible_cpu(cpu) { 1688 res += snmp_get_cpu_field64(mib, cpu, offt, syncp_offset); 1689 } 1690 return res; 1691 } 1692 EXPORT_SYMBOL_GPL(snmp_fold_field64); 1693 #endif 1694 1695 #ifdef CONFIG_IP_MULTICAST 1696 static const struct net_protocol igmp_protocol = { 1697 .handler = igmp_rcv, 1698 .netns_ok = 1, 1699 }; 1700 #endif 1701 1702 /* thinking of making this const? Don't. 1703 * early_demux can change based on sysctl. 1704 */ 1705 static struct net_protocol tcp_protocol = { 1706 .early_demux = tcp_v4_early_demux, 1707 .early_demux_handler = tcp_v4_early_demux, 1708 .handler = tcp_v4_rcv, 1709 .err_handler = tcp_v4_err, 1710 .no_policy = 1, 1711 .netns_ok = 1, 1712 .icmp_strict_tag_validation = 1, 1713 }; 1714 1715 /* thinking of making this const? Don't. 1716 * early_demux can change based on sysctl. 1717 */ 1718 static struct net_protocol udp_protocol = { 1719 .early_demux = udp_v4_early_demux, 1720 .early_demux_handler = udp_v4_early_demux, 1721 .handler = udp_rcv, 1722 .err_handler = udp_err, 1723 .no_policy = 1, 1724 .netns_ok = 1, 1725 }; 1726 1727 static const struct net_protocol icmp_protocol = { 1728 .handler = icmp_rcv, 1729 .err_handler = icmp_err, 1730 .no_policy = 1, 1731 .netns_ok = 1, 1732 }; 1733 1734 static __net_init int ipv4_mib_init_net(struct net *net) 1735 { 1736 int i; 1737 1738 net->mib.tcp_statistics = alloc_percpu(struct tcp_mib); 1739 if (!net->mib.tcp_statistics) 1740 goto err_tcp_mib; 1741 net->mib.ip_statistics = alloc_percpu(struct ipstats_mib); 1742 if (!net->mib.ip_statistics) 1743 goto err_ip_mib; 1744 1745 for_each_possible_cpu(i) { 1746 struct ipstats_mib *af_inet_stats; 1747 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i); 1748 u64_stats_init(&af_inet_stats->syncp); 1749 } 1750 1751 net->mib.net_statistics = alloc_percpu(struct linux_mib); 1752 if (!net->mib.net_statistics) 1753 goto err_net_mib; 1754 net->mib.udp_statistics = alloc_percpu(struct udp_mib); 1755 if (!net->mib.udp_statistics) 1756 goto err_udp_mib; 1757 net->mib.udplite_statistics = alloc_percpu(struct udp_mib); 1758 if (!net->mib.udplite_statistics) 1759 goto err_udplite_mib; 1760 net->mib.icmp_statistics = alloc_percpu(struct icmp_mib); 1761 if (!net->mib.icmp_statistics) 1762 goto err_icmp_mib; 1763 net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib), 1764 GFP_KERNEL); 1765 if (!net->mib.icmpmsg_statistics) 1766 goto err_icmpmsg_mib; 1767 1768 tcp_mib_init(net); 1769 return 0; 1770 1771 err_icmpmsg_mib: 1772 free_percpu(net->mib.icmp_statistics); 1773 err_icmp_mib: 1774 free_percpu(net->mib.udplite_statistics); 1775 err_udplite_mib: 1776 free_percpu(net->mib.udp_statistics); 1777 err_udp_mib: 1778 free_percpu(net->mib.net_statistics); 1779 err_net_mib: 1780 free_percpu(net->mib.ip_statistics); 1781 err_ip_mib: 1782 free_percpu(net->mib.tcp_statistics); 1783 err_tcp_mib: 1784 return -ENOMEM; 1785 } 1786 1787 static __net_exit void ipv4_mib_exit_net(struct net *net) 1788 { 1789 kfree(net->mib.icmpmsg_statistics); 1790 free_percpu(net->mib.icmp_statistics); 1791 free_percpu(net->mib.udplite_statistics); 1792 free_percpu(net->mib.udp_statistics); 1793 free_percpu(net->mib.net_statistics); 1794 free_percpu(net->mib.ip_statistics); 1795 free_percpu(net->mib.tcp_statistics); 1796 #ifdef CONFIG_MPTCP 1797 /* allocated on demand, see mptcp_init_sock() */ 1798 free_percpu(net->mib.mptcp_statistics); 1799 #endif 1800 } 1801 1802 static __net_initdata struct pernet_operations ipv4_mib_ops = { 1803 .init = ipv4_mib_init_net, 1804 .exit = ipv4_mib_exit_net, 1805 }; 1806 1807 static int __init init_ipv4_mibs(void) 1808 { 1809 return register_pernet_subsys(&ipv4_mib_ops); 1810 } 1811 1812 static __net_init int inet_init_net(struct net *net) 1813 { 1814 /* 1815 * Set defaults for local port range 1816 */ 1817 seqlock_init(&net->ipv4.ip_local_ports.lock); 1818 net->ipv4.ip_local_ports.range[0] = 32768; 1819 net->ipv4.ip_local_ports.range[1] = 60999; 1820 1821 seqlock_init(&net->ipv4.ping_group_range.lock); 1822 /* 1823 * Sane defaults - nobody may create ping sockets. 1824 * Boot scripts should set this to distro-specific group. 1825 */ 1826 net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1); 1827 net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0); 1828 1829 /* Default values for sysctl-controlled parameters. 1830 * We set them here, in case sysctl is not compiled. 1831 */ 1832 net->ipv4.sysctl_ip_default_ttl = IPDEFTTL; 1833 net->ipv4.sysctl_ip_fwd_update_priority = 1; 1834 net->ipv4.sysctl_ip_dynaddr = 0; 1835 net->ipv4.sysctl_ip_early_demux = 1; 1836 net->ipv4.sysctl_udp_early_demux = 1; 1837 net->ipv4.sysctl_tcp_early_demux = 1; 1838 #ifdef CONFIG_SYSCTL 1839 net->ipv4.sysctl_ip_prot_sock = PROT_SOCK; 1840 #endif 1841 1842 /* Some igmp sysctl, whose values are always used */ 1843 net->ipv4.sysctl_igmp_max_memberships = 20; 1844 net->ipv4.sysctl_igmp_max_msf = 10; 1845 /* IGMP reports for link-local multicast groups are enabled by default */ 1846 net->ipv4.sysctl_igmp_llm_reports = 1; 1847 net->ipv4.sysctl_igmp_qrv = 2; 1848 1849 return 0; 1850 } 1851 1852 static __net_initdata struct pernet_operations af_inet_ops = { 1853 .init = inet_init_net, 1854 }; 1855 1856 static int __init init_inet_pernet_ops(void) 1857 { 1858 return register_pernet_subsys(&af_inet_ops); 1859 } 1860 1861 static int ipv4_proc_init(void); 1862 1863 /* 1864 * IP protocol layer initialiser 1865 */ 1866 1867 static struct packet_offload ip_packet_offload __read_mostly = { 1868 .type = cpu_to_be16(ETH_P_IP), 1869 .callbacks = { 1870 .gso_segment = inet_gso_segment, 1871 .gro_receive = inet_gro_receive, 1872 .gro_complete = inet_gro_complete, 1873 }, 1874 }; 1875 1876 static const struct net_offload ipip_offload = { 1877 .callbacks = { 1878 .gso_segment = ipip_gso_segment, 1879 .gro_receive = ipip_gro_receive, 1880 .gro_complete = ipip_gro_complete, 1881 }, 1882 }; 1883 1884 static int __init ipip_offload_init(void) 1885 { 1886 return inet_add_offload(&ipip_offload, IPPROTO_IPIP); 1887 } 1888 1889 static int __init ipv4_offload_init(void) 1890 { 1891 /* 1892 * Add offloads 1893 */ 1894 if (udpv4_offload_init() < 0) 1895 pr_crit("%s: Cannot add UDP protocol offload\n", __func__); 1896 if (tcpv4_offload_init() < 0) 1897 pr_crit("%s: Cannot add TCP protocol offload\n", __func__); 1898 if (ipip_offload_init() < 0) 1899 pr_crit("%s: Cannot add IPIP protocol offload\n", __func__); 1900 1901 dev_add_offload(&ip_packet_offload); 1902 return 0; 1903 } 1904 1905 fs_initcall(ipv4_offload_init); 1906 1907 static struct packet_type ip_packet_type __read_mostly = { 1908 .type = cpu_to_be16(ETH_P_IP), 1909 .func = ip_rcv, 1910 .list_func = ip_list_rcv, 1911 }; 1912 1913 static int __init inet_init(void) 1914 { 1915 struct inet_protosw *q; 1916 struct list_head *r; 1917 int rc = -EINVAL; 1918 1919 sock_skb_cb_check_size(sizeof(struct inet_skb_parm)); 1920 1921 rc = proto_register(&tcp_prot, 1); 1922 if (rc) 1923 goto out; 1924 1925 rc = proto_register(&udp_prot, 1); 1926 if (rc) 1927 goto out_unregister_tcp_proto; 1928 1929 rc = proto_register(&raw_prot, 1); 1930 if (rc) 1931 goto out_unregister_udp_proto; 1932 1933 rc = proto_register(&ping_prot, 1); 1934 if (rc) 1935 goto out_unregister_raw_proto; 1936 1937 /* 1938 * Tell SOCKET that we are alive... 1939 */ 1940 1941 (void)sock_register(&inet_family_ops); 1942 1943 #ifdef CONFIG_SYSCTL 1944 ip_static_sysctl_init(); 1945 #endif 1946 1947 /* 1948 * Add all the base protocols. 1949 */ 1950 1951 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 1952 pr_crit("%s: Cannot add ICMP protocol\n", __func__); 1953 if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) 1954 pr_crit("%s: Cannot add UDP protocol\n", __func__); 1955 if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) 1956 pr_crit("%s: Cannot add TCP protocol\n", __func__); 1957 #ifdef CONFIG_IP_MULTICAST 1958 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 1959 pr_crit("%s: Cannot add IGMP protocol\n", __func__); 1960 #endif 1961 1962 /* Register the socket-side information for inet_create. */ 1963 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 1964 INIT_LIST_HEAD(r); 1965 1966 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 1967 inet_register_protosw(q); 1968 1969 /* 1970 * Set the ARP module up 1971 */ 1972 1973 arp_init(); 1974 1975 /* 1976 * Set the IP module up 1977 */ 1978 1979 ip_init(); 1980 1981 /* Setup TCP slab cache for open requests. */ 1982 tcp_init(); 1983 1984 /* Setup UDP memory threshold */ 1985 udp_init(); 1986 1987 /* Add UDP-Lite (RFC 3828) */ 1988 udplite4_register(); 1989 1990 raw_init(); 1991 1992 ping_init(); 1993 1994 /* 1995 * Set the ICMP layer up 1996 */ 1997 1998 if (icmp_init() < 0) 1999 panic("Failed to create the ICMP control socket.\n"); 2000 2001 /* 2002 * Initialise the multicast router 2003 */ 2004 #if defined(CONFIG_IP_MROUTE) 2005 if (ip_mr_init()) 2006 pr_crit("%s: Cannot init ipv4 mroute\n", __func__); 2007 #endif 2008 2009 if (init_inet_pernet_ops()) 2010 pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__); 2011 /* 2012 * Initialise per-cpu ipv4 mibs 2013 */ 2014 2015 if (init_ipv4_mibs()) 2016 pr_crit("%s: Cannot init ipv4 mibs\n", __func__); 2017 2018 ipv4_proc_init(); 2019 2020 ipfrag_init(); 2021 2022 dev_add_pack(&ip_packet_type); 2023 2024 ip_tunnel_core_init(); 2025 2026 rc = 0; 2027 out: 2028 return rc; 2029 out_unregister_raw_proto: 2030 proto_unregister(&raw_prot); 2031 out_unregister_udp_proto: 2032 proto_unregister(&udp_prot); 2033 out_unregister_tcp_proto: 2034 proto_unregister(&tcp_prot); 2035 goto out; 2036 } 2037 2038 fs_initcall(inet_init); 2039 2040 /* ------------------------------------------------------------------------ */ 2041 2042 #ifdef CONFIG_PROC_FS 2043 static int __init ipv4_proc_init(void) 2044 { 2045 int rc = 0; 2046 2047 if (raw_proc_init()) 2048 goto out_raw; 2049 if (tcp4_proc_init()) 2050 goto out_tcp; 2051 if (udp4_proc_init()) 2052 goto out_udp; 2053 if (ping_proc_init()) 2054 goto out_ping; 2055 if (ip_misc_proc_init()) 2056 goto out_misc; 2057 out: 2058 return rc; 2059 out_misc: 2060 ping_proc_exit(); 2061 out_ping: 2062 udp4_proc_exit(); 2063 out_udp: 2064 tcp4_proc_exit(); 2065 out_tcp: 2066 raw_proc_exit(); 2067 out_raw: 2068 rc = -ENOMEM; 2069 goto out; 2070 } 2071 2072 #else /* CONFIG_PROC_FS */ 2073 static int __init ipv4_proc_init(void) 2074 { 2075 return 0; 2076 } 2077 #endif /* CONFIG_PROC_FS */ 2078