1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * INET An implementation of the TCP/IP protocol suite for the LINUX 4 * operating system. INET is implemented using the BSD Socket 5 * interface as the means of communication with the user level. 6 * 7 * PF_INET protocol family socket handler. 8 * 9 * Authors: Ross Biro 10 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 11 * Florian La Roche, <flla@stud.uni-sb.de> 12 * Alan Cox, <A.Cox@swansea.ac.uk> 13 * 14 * Changes (see also sock.c) 15 * 16 * piggy, 17 * Karl Knutson : Socket protocol table 18 * A.N.Kuznetsov : Socket death error in accept(). 19 * John Richardson : Fix non blocking error in connect() 20 * so sockets that fail to connect 21 * don't return -EINPROGRESS. 22 * Alan Cox : Asynchronous I/O support 23 * Alan Cox : Keep correct socket pointer on sock 24 * structures 25 * when accept() ed 26 * Alan Cox : Semantics of SO_LINGER aren't state 27 * moved to close when you look carefully. 28 * With this fixed and the accept bug fixed 29 * some RPC stuff seems happier. 30 * Niibe Yutaka : 4.4BSD style write async I/O 31 * Alan Cox, 32 * Tony Gale : Fixed reuse semantics. 33 * Alan Cox : bind() shouldn't abort existing but dead 34 * sockets. Stops FTP netin:.. I hope. 35 * Alan Cox : bind() works correctly for RAW sockets. 36 * Note that FreeBSD at least was broken 37 * in this respect so be careful with 38 * compatibility tests... 39 * Alan Cox : routing cache support 40 * Alan Cox : memzero the socket structure for 41 * compactness. 42 * Matt Day : nonblock connect error handler 43 * Alan Cox : Allow large numbers of pending sockets 44 * (eg for big web sites), but only if 45 * specifically application requested. 46 * Alan Cox : New buffering throughout IP. Used 47 * dumbly. 48 * Alan Cox : New buffering now used smartly. 49 * Alan Cox : BSD rather than common sense 50 * interpretation of listen. 51 * Germano Caronni : Assorted small races. 52 * Alan Cox : sendmsg/recvmsg basic support. 53 * Alan Cox : Only sendmsg/recvmsg now supported. 54 * Alan Cox : Locked down bind (see security list). 55 * Alan Cox : Loosened bind a little. 56 * Mike McLagan : ADD/DEL DLCI Ioctls 57 * Willy Konynenberg : Transparent proxying support. 58 * David S. Miller : New socket lookup architecture. 59 * Some other random speedups. 60 * Cyrus Durgin : Cleaned up file for kmod hacks. 61 * Andi Kleen : Fix inet_stream_connect TCP race. 62 */ 63 64 #define pr_fmt(fmt) "IPv4: " fmt 65 66 #include <linux/err.h> 67 #include <linux/errno.h> 68 #include <linux/types.h> 69 #include <linux/socket.h> 70 #include <linux/in.h> 71 #include <linux/kernel.h> 72 #include <linux/kmod.h> 73 #include <linux/sched.h> 74 #include <linux/timer.h> 75 #include <linux/string.h> 76 #include <linux/sockios.h> 77 #include <linux/net.h> 78 #include <linux/capability.h> 79 #include <linux/fcntl.h> 80 #include <linux/mm.h> 81 #include <linux/interrupt.h> 82 #include <linux/stat.h> 83 #include <linux/init.h> 84 #include <linux/poll.h> 85 #include <linux/netfilter_ipv4.h> 86 #include <linux/random.h> 87 #include <linux/slab.h> 88 89 #include <linux/uaccess.h> 90 91 #include <linux/inet.h> 92 #include <linux/igmp.h> 93 #include <linux/inetdevice.h> 94 #include <linux/netdevice.h> 95 #include <net/checksum.h> 96 #include <net/ip.h> 97 #include <net/protocol.h> 98 #include <net/arp.h> 99 #include <net/route.h> 100 #include <net/ip_fib.h> 101 #include <net/inet_connection_sock.h> 102 #include <net/gro.h> 103 #include <net/gso.h> 104 #include <net/tcp.h> 105 #include <net/psp.h> 106 #include <net/udp.h> 107 #include <net/udplite.h> 108 #include <net/ping.h> 109 #include <linux/skbuff.h> 110 #include <net/sock.h> 111 #include <net/raw.h> 112 #include <net/icmp.h> 113 #include <net/inet_common.h> 114 #include <net/ip_tunnels.h> 115 #include <net/xfrm.h> 116 #include <net/net_namespace.h> 117 #include <net/secure_seq.h> 118 #ifdef CONFIG_IP_MROUTE 119 #include <linux/mroute.h> 120 #endif 121 #include <net/l3mdev.h> 122 #include <net/compat.h> 123 #include <net/rps.h> 124 125 #include <trace/events/sock.h> 126 127 /* The inetsw table contains everything that inet_create needs to 128 * build a new socket. 129 */ 130 static struct list_head inetsw[SOCK_MAX]; 131 static DEFINE_SPINLOCK(inetsw_lock); 132 133 /* New destruction routine */ 134 135 void inet_sock_destruct(struct sock *sk) 136 { 137 struct inet_sock *inet = inet_sk(sk); 138 139 __skb_queue_purge(&sk->sk_receive_queue); 140 __skb_queue_purge(&sk->sk_error_queue); 141 142 sk_mem_reclaim_final(sk); 143 144 if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) { 145 pr_err("Attempt to release TCP socket in state %d %p\n", 146 sk->sk_state, sk); 147 return; 148 } 149 if (!sock_flag(sk, SOCK_DEAD)) { 150 pr_err("Attempt to release alive inet socket %p\n", sk); 151 return; 152 } 153 154 WARN_ON_ONCE(atomic_read(&sk->sk_rmem_alloc)); 155 WARN_ON_ONCE(refcount_read(&sk->sk_wmem_alloc)); 156 WARN_ON_ONCE(sk->sk_wmem_queued); 157 WARN_ON_ONCE(sk->sk_forward_alloc); 158 159 kfree(rcu_dereference_protected(inet->inet_opt, 1)); 160 dst_release(rcu_dereference_protected(sk->sk_dst_cache, 1)); 161 dst_release(rcu_dereference_protected(sk->sk_rx_dst, 1)); 162 psp_sk_assoc_free(sk); 163 } 164 EXPORT_SYMBOL(inet_sock_destruct); 165 166 /* 167 * The routines beyond this point handle the behaviour of an AF_INET 168 * socket object. Mostly it punts to the subprotocols of IP to do 169 * the work. 170 */ 171 172 /* 173 * Automatically bind an unbound socket. 174 */ 175 176 static int inet_autobind(struct sock *sk) 177 { 178 struct inet_sock *inet; 179 /* We may need to bind the socket. */ 180 lock_sock(sk); 181 inet = inet_sk(sk); 182 if (!inet->inet_num) { 183 if (sk->sk_prot->get_port(sk, 0)) { 184 release_sock(sk); 185 return -EAGAIN; 186 } 187 inet->inet_sport = htons(inet->inet_num); 188 } 189 release_sock(sk); 190 return 0; 191 } 192 193 int __inet_listen_sk(struct sock *sk, int backlog) 194 { 195 unsigned char old_state = sk->sk_state; 196 int err, tcp_fastopen; 197 198 if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN))) 199 return -EINVAL; 200 201 WRITE_ONCE(sk->sk_max_ack_backlog, backlog); 202 /* Really, if the socket is already in listen state 203 * we can only allow the backlog to be adjusted. 204 */ 205 if (old_state != TCP_LISTEN) { 206 /* Enable TFO w/o requiring TCP_FASTOPEN socket option. 207 * Note that only TCP sockets (SOCK_STREAM) will reach here. 208 * Also fastopen backlog may already been set via the option 209 * because the socket was in TCP_LISTEN state previously but 210 * was shutdown() rather than close(). 211 */ 212 tcp_fastopen = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_fastopen); 213 if ((tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) && 214 (tcp_fastopen & TFO_SERVER_ENABLE) && 215 !inet_csk(sk)->icsk_accept_queue.fastopenq.max_qlen) { 216 fastopen_queue_tune(sk, backlog); 217 tcp_fastopen_init_key_once(sock_net(sk)); 218 } 219 220 err = inet_csk_listen_start(sk); 221 if (err) 222 return err; 223 224 tcp_call_bpf(sk, BPF_SOCK_OPS_TCP_LISTEN_CB, 0, NULL); 225 } 226 return 0; 227 } 228 229 /* 230 * Move a socket into listening state. 231 */ 232 int inet_listen(struct socket *sock, int backlog) 233 { 234 struct sock *sk = sock->sk; 235 int err = -EINVAL; 236 237 lock_sock(sk); 238 239 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM) 240 goto out; 241 242 err = __inet_listen_sk(sk, backlog); 243 244 out: 245 release_sock(sk); 246 return err; 247 } 248 EXPORT_SYMBOL(inet_listen); 249 250 /* 251 * Create an inet socket. 252 */ 253 254 static int inet_create(struct net *net, struct socket *sock, int protocol, 255 int kern) 256 { 257 struct sock *sk; 258 struct inet_protosw *answer; 259 struct inet_sock *inet; 260 struct proto *answer_prot; 261 unsigned char answer_flags; 262 int try_loading_module = 0; 263 int err; 264 265 if (protocol < 0 || protocol >= IPPROTO_MAX) 266 return -EINVAL; 267 268 sock->state = SS_UNCONNECTED; 269 270 /* Look for the requested type/protocol pair. */ 271 lookup_protocol: 272 err = -ESOCKTNOSUPPORT; 273 rcu_read_lock(); 274 list_for_each_entry_rcu(answer, &inetsw[sock->type], list) { 275 276 err = 0; 277 /* Check the non-wild match. */ 278 if (protocol == answer->protocol) { 279 if (protocol != IPPROTO_IP) 280 break; 281 } else { 282 /* Check for the two wild cases. */ 283 if (IPPROTO_IP == protocol) { 284 protocol = answer->protocol; 285 break; 286 } 287 if (IPPROTO_IP == answer->protocol) 288 break; 289 } 290 err = -EPROTONOSUPPORT; 291 } 292 293 if (unlikely(err)) { 294 if (try_loading_module < 2) { 295 rcu_read_unlock(); 296 /* 297 * Be more specific, e.g. net-pf-2-proto-132-type-1 298 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) 299 */ 300 if (++try_loading_module == 1) 301 request_module("net-pf-%d-proto-%d-type-%d", 302 PF_INET, protocol, sock->type); 303 /* 304 * Fall back to generic, e.g. net-pf-2-proto-132 305 * (net-pf-PF_INET-proto-IPPROTO_SCTP) 306 */ 307 else 308 request_module("net-pf-%d-proto-%d", 309 PF_INET, protocol); 310 goto lookup_protocol; 311 } else 312 goto out_rcu_unlock; 313 } 314 315 err = -EPERM; 316 if (sock->type == SOCK_RAW && !kern && 317 !ns_capable(net->user_ns, CAP_NET_RAW)) 318 goto out_rcu_unlock; 319 320 sock->ops = answer->ops; 321 answer_prot = answer->prot; 322 answer_flags = answer->flags; 323 rcu_read_unlock(); 324 325 WARN_ON(!answer_prot->slab); 326 327 err = -ENOMEM; 328 sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot, kern); 329 if (!sk) 330 goto out; 331 332 err = 0; 333 if (INET_PROTOSW_REUSE & answer_flags) 334 sk->sk_reuse = SK_CAN_REUSE; 335 336 if (INET_PROTOSW_ICSK & answer_flags) 337 inet_init_csk_locks(sk); 338 339 inet = inet_sk(sk); 340 inet_assign_bit(IS_ICSK, sk, INET_PROTOSW_ICSK & answer_flags); 341 342 inet_clear_bit(NODEFRAG, sk); 343 344 if (SOCK_RAW == sock->type) { 345 inet->inet_num = protocol; 346 if (IPPROTO_RAW == protocol) 347 inet_set_bit(HDRINCL, sk); 348 } 349 350 if (READ_ONCE(net->ipv4.sysctl_ip_no_pmtu_disc)) 351 inet->pmtudisc = IP_PMTUDISC_DONT; 352 else 353 inet->pmtudisc = IP_PMTUDISC_WANT; 354 355 atomic_set(&inet->inet_id, 0); 356 357 sock_init_data(sock, sk); 358 359 sk->sk_destruct = inet_sock_destruct; 360 sk->sk_protocol = protocol; 361 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 362 sk->sk_txrehash = READ_ONCE(net->core.sysctl_txrehash); 363 364 inet->uc_ttl = -1; 365 inet_set_bit(MC_LOOP, sk); 366 inet->mc_ttl = 1; 367 inet_set_bit(MC_ALL, sk); 368 inet->mc_index = 0; 369 inet->mc_list = NULL; 370 inet->rcv_tos = 0; 371 372 if (inet->inet_num) { 373 /* It assumes that any protocol which allows 374 * the user to assign a number at socket 375 * creation time automatically 376 * shares. 377 */ 378 inet->inet_sport = htons(inet->inet_num); 379 /* Add to protocol hash chains. */ 380 err = sk->sk_prot->hash(sk); 381 if (err) 382 goto out_sk_release; 383 } 384 385 if (sk->sk_prot->init) { 386 err = sk->sk_prot->init(sk); 387 if (err) 388 goto out_sk_release; 389 } 390 391 if (!kern) { 392 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk); 393 if (err) 394 goto out_sk_release; 395 } 396 out: 397 return err; 398 out_rcu_unlock: 399 rcu_read_unlock(); 400 goto out; 401 out_sk_release: 402 sk_common_release(sk); 403 sock->sk = NULL; 404 goto out; 405 } 406 407 408 /* 409 * The peer socket should always be NULL (or else). When we call this 410 * function we are destroying the object and from then on nobody 411 * should refer to it. 412 */ 413 int inet_release(struct socket *sock) 414 { 415 struct sock *sk = sock->sk; 416 417 if (sk) { 418 long timeout; 419 420 if (!sk->sk_kern_sock) 421 BPF_CGROUP_RUN_PROG_INET_SOCK_RELEASE(sk); 422 423 /* Applications forget to leave groups before exiting */ 424 ip_mc_drop_socket(sk); 425 426 /* If linger is set, we don't return until the close 427 * is complete. Otherwise we return immediately. The 428 * actually closing is done the same either way. 429 * 430 * If the close is due to the process exiting, we never 431 * linger.. 432 */ 433 timeout = 0; 434 if (sock_flag(sk, SOCK_LINGER) && 435 !(current->flags & PF_EXITING)) 436 timeout = sk->sk_lingertime; 437 sk->sk_prot->close(sk, timeout); 438 sock->sk = NULL; 439 } 440 return 0; 441 } 442 EXPORT_SYMBOL(inet_release); 443 444 int inet_bind_sk(struct sock *sk, struct sockaddr_unsized *uaddr, int addr_len) 445 { 446 u32 flags = BIND_WITH_LOCK; 447 int err; 448 449 /* If the socket has its own bind function then use it. (RAW) */ 450 if (sk->sk_prot->bind) { 451 return sk->sk_prot->bind(sk, uaddr, addr_len); 452 } 453 if (addr_len < sizeof(struct sockaddr_in)) 454 return -EINVAL; 455 456 /* BPF prog is run before any checks are done so that if the prog 457 * changes context in a wrong way it will be caught. 458 */ 459 err = BPF_CGROUP_RUN_PROG_INET_BIND_LOCK(sk, uaddr, &addr_len, 460 CGROUP_INET4_BIND, &flags); 461 if (err) 462 return err; 463 464 return __inet_bind(sk, uaddr, addr_len, flags); 465 } 466 467 int inet_bind(struct socket *sock, struct sockaddr_unsized *uaddr, int addr_len) 468 { 469 return inet_bind_sk(sock->sk, uaddr, addr_len); 470 } 471 EXPORT_SYMBOL(inet_bind); 472 473 int __inet_bind(struct sock *sk, struct sockaddr_unsized *uaddr, int addr_len, 474 u32 flags) 475 { 476 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 477 struct inet_sock *inet = inet_sk(sk); 478 struct net *net = sock_net(sk); 479 unsigned short snum; 480 int chk_addr_ret; 481 u32 tb_id = RT_TABLE_LOCAL; 482 int err; 483 484 if (addr->sin_family != AF_INET) { 485 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET) 486 * only if s_addr is INADDR_ANY. 487 */ 488 err = -EAFNOSUPPORT; 489 if (addr->sin_family != AF_UNSPEC || 490 addr->sin_addr.s_addr != htonl(INADDR_ANY)) 491 goto out; 492 } 493 494 tb_id = l3mdev_fib_table_by_index(net, sk->sk_bound_dev_if) ? : tb_id; 495 chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id); 496 497 /* Not specified by any standard per-se, however it breaks too 498 * many applications when removed. It is unfortunate since 499 * allowing applications to make a non-local bind solves 500 * several problems with systems using dynamic addressing. 501 * (ie. your servers still start up even if your ISDN link 502 * is temporarily down) 503 */ 504 err = -EADDRNOTAVAIL; 505 if (!inet_addr_valid_or_nonlocal(net, inet, addr->sin_addr.s_addr, 506 chk_addr_ret)) 507 goto out; 508 509 snum = ntohs(addr->sin_port); 510 err = -EACCES; 511 if (!(flags & BIND_NO_CAP_NET_BIND_SERVICE) && 512 snum && inet_port_requires_bind_service(net, snum) && 513 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 514 goto out; 515 516 /* We keep a pair of addresses. rcv_saddr is the one 517 * used by hash lookups, and saddr is used for transmit. 518 * 519 * In the BSD API these are the same except where it 520 * would be illegal to use them (multicast/broadcast) in 521 * which case the sending device address is used. 522 */ 523 if (flags & BIND_WITH_LOCK) 524 lock_sock(sk); 525 526 /* Check these errors (active socket, double bind). */ 527 err = -EINVAL; 528 if (sk->sk_state != TCP_CLOSE || inet->inet_num) 529 goto out_release_sock; 530 531 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 532 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 533 inet->inet_saddr = 0; /* Use device */ 534 535 /* Make sure we are allowed to bind here. */ 536 if (snum || !(inet_test_bit(BIND_ADDRESS_NO_PORT, sk) || 537 (flags & BIND_FORCE_ADDRESS_NO_PORT))) { 538 err = sk->sk_prot->get_port(sk, snum); 539 if (err) { 540 inet->inet_saddr = inet->inet_rcv_saddr = 0; 541 goto out_release_sock; 542 } 543 if (!(flags & BIND_FROM_BPF)) { 544 err = BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk); 545 if (err) { 546 inet->inet_saddr = inet->inet_rcv_saddr = 0; 547 if (sk->sk_prot->put_port) 548 sk->sk_prot->put_port(sk); 549 goto out_release_sock; 550 } 551 } 552 } 553 554 if (inet->inet_rcv_saddr) 555 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 556 if (snum) 557 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 558 inet->inet_sport = htons(inet->inet_num); 559 inet->inet_daddr = 0; 560 inet->inet_dport = 0; 561 sk_dst_reset(sk); 562 err = 0; 563 out_release_sock: 564 if (flags & BIND_WITH_LOCK) 565 release_sock(sk); 566 out: 567 return err; 568 } 569 570 int inet_dgram_connect(struct socket *sock, struct sockaddr_unsized *uaddr, 571 int addr_len, int flags) 572 { 573 struct sock *sk = sock->sk; 574 const struct proto *prot; 575 int err; 576 577 if (addr_len < sizeof(uaddr->sa_family)) 578 return -EINVAL; 579 580 /* IPV6_ADDRFORM can change sk->sk_prot under us. */ 581 prot = READ_ONCE(sk->sk_prot); 582 583 if (uaddr->sa_family == AF_UNSPEC) 584 return prot->disconnect(sk, flags); 585 586 if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) { 587 err = prot->pre_connect(sk, uaddr, addr_len); 588 if (err) 589 return err; 590 } 591 592 if (data_race(!inet_sk(sk)->inet_num) && inet_autobind(sk)) 593 return -EAGAIN; 594 return prot->connect(sk, uaddr, addr_len); 595 } 596 EXPORT_SYMBOL(inet_dgram_connect); 597 598 static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias) 599 { 600 DEFINE_WAIT_FUNC(wait, woken_wake_function); 601 602 add_wait_queue(sk_sleep(sk), &wait); 603 sk->sk_write_pending += writebias; 604 605 /* Basic assumption: if someone sets sk->sk_err, he _must_ 606 * change state of the socket from TCP_SYN_*. 607 * Connect() does not allow to get error notifications 608 * without closing the socket. 609 */ 610 while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 611 release_sock(sk); 612 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo); 613 lock_sock(sk); 614 if (signal_pending(current) || !timeo) 615 break; 616 } 617 remove_wait_queue(sk_sleep(sk), &wait); 618 sk->sk_write_pending -= writebias; 619 return timeo; 620 } 621 622 /* 623 * Connect to a remote host. There is regrettably still a little 624 * TCP 'magic' in here. 625 */ 626 int __inet_stream_connect(struct socket *sock, struct sockaddr_unsized *uaddr, 627 int addr_len, int flags, int is_sendmsg) 628 { 629 struct sock *sk = sock->sk; 630 int err; 631 long timeo; 632 633 /* 634 * uaddr can be NULL and addr_len can be 0 if: 635 * sk is a TCP fastopen active socket and 636 * TCP_FASTOPEN_CONNECT sockopt is set and 637 * we already have a valid cookie for this socket. 638 * In this case, user can call write() after connect(). 639 * write() will invoke tcp_sendmsg_fastopen() which calls 640 * __inet_stream_connect(). 641 */ 642 if (uaddr) { 643 if (addr_len < sizeof(uaddr->sa_family)) 644 return -EINVAL; 645 646 if (uaddr->sa_family == AF_UNSPEC) { 647 sk->sk_disconnects++; 648 err = sk->sk_prot->disconnect(sk, flags); 649 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 650 goto out; 651 } 652 } 653 654 switch (sock->state) { 655 default: 656 err = -EINVAL; 657 goto out; 658 case SS_CONNECTED: 659 err = -EISCONN; 660 goto out; 661 case SS_CONNECTING: 662 if (inet_test_bit(DEFER_CONNECT, sk)) 663 err = is_sendmsg ? -EINPROGRESS : -EISCONN; 664 else 665 err = -EALREADY; 666 /* Fall out of switch with err, set for this state */ 667 break; 668 case SS_UNCONNECTED: 669 err = -EISCONN; 670 if (sk->sk_state != TCP_CLOSE) 671 goto out; 672 673 if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) { 674 err = sk->sk_prot->pre_connect(sk, uaddr, addr_len); 675 if (err) 676 goto out; 677 } 678 679 err = sk->sk_prot->connect(sk, uaddr, addr_len); 680 if (err < 0) 681 goto out; 682 683 sock->state = SS_CONNECTING; 684 685 if (!err && inet_test_bit(DEFER_CONNECT, sk)) 686 goto out; 687 688 /* Just entered SS_CONNECTING state; the only 689 * difference is that return value in non-blocking 690 * case is EINPROGRESS, rather than EALREADY. 691 */ 692 err = -EINPROGRESS; 693 break; 694 } 695 696 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 697 698 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 699 int writebias = (sk->sk_protocol == IPPROTO_TCP) && 700 tcp_sk(sk)->fastopen_req && 701 tcp_sk(sk)->fastopen_req->data ? 1 : 0; 702 int dis = sk->sk_disconnects; 703 704 /* Error code is set above */ 705 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias)) 706 goto out; 707 708 err = sock_intr_errno(timeo); 709 if (signal_pending(current)) 710 goto out; 711 712 if (dis != sk->sk_disconnects) { 713 err = -EPIPE; 714 goto out; 715 } 716 } 717 718 /* Connection was closed by RST, timeout, ICMP error 719 * or another process disconnected us. 720 */ 721 if (sk->sk_state == TCP_CLOSE) 722 goto sock_error; 723 724 /* sk->sk_err may be not zero now, if RECVERR was ordered by user 725 * and error was received after socket entered established state. 726 * Hence, it is handled normally after connect() return successfully. 727 */ 728 729 sock->state = SS_CONNECTED; 730 err = 0; 731 out: 732 return err; 733 734 sock_error: 735 err = sock_error(sk) ? : -ECONNABORTED; 736 sock->state = SS_UNCONNECTED; 737 sk->sk_disconnects++; 738 if (sk->sk_prot->disconnect(sk, flags)) 739 sock->state = SS_DISCONNECTING; 740 goto out; 741 } 742 EXPORT_SYMBOL(__inet_stream_connect); 743 744 int inet_stream_connect(struct socket *sock, struct sockaddr_unsized *uaddr, 745 int addr_len, int flags) 746 { 747 int err; 748 749 lock_sock(sock->sk); 750 err = __inet_stream_connect(sock, uaddr, addr_len, flags, 0); 751 release_sock(sock->sk); 752 return err; 753 } 754 EXPORT_SYMBOL(inet_stream_connect); 755 756 void __inet_accept(struct socket *sock, struct socket *newsock, struct sock *newsk) 757 { 758 if (mem_cgroup_sockets_enabled) { 759 mem_cgroup_sk_alloc(newsk); 760 __sk_charge(newsk, GFP_KERNEL); 761 } 762 763 sock_rps_record_flow(newsk); 764 WARN_ON(!((1 << newsk->sk_state) & 765 (TCPF_ESTABLISHED | TCPF_SYN_RECV | 766 TCPF_FIN_WAIT1 | TCPF_FIN_WAIT2 | 767 TCPF_CLOSING | TCPF_CLOSE_WAIT | 768 TCPF_CLOSE))); 769 770 if (test_bit(SOCK_SUPPORT_ZC, &sock->flags)) 771 set_bit(SOCK_SUPPORT_ZC, &newsock->flags); 772 sock_graft(newsk, newsock); 773 774 newsock->state = SS_CONNECTED; 775 } 776 EXPORT_SYMBOL_GPL(__inet_accept); 777 778 /* 779 * Accept a pending connection. The TCP layer now gives BSD semantics. 780 */ 781 782 int inet_accept(struct socket *sock, struct socket *newsock, 783 struct proto_accept_arg *arg) 784 { 785 struct sock *sk1 = sock->sk, *sk2; 786 787 /* IPV6_ADDRFORM can change sk->sk_prot under us. */ 788 arg->err = -EINVAL; 789 sk2 = READ_ONCE(sk1->sk_prot)->accept(sk1, arg); 790 if (!sk2) 791 return arg->err; 792 793 lock_sock(sk2); 794 __inet_accept(sock, newsock, sk2); 795 release_sock(sk2); 796 return 0; 797 } 798 EXPORT_SYMBOL(inet_accept); 799 800 /* 801 * This does both peername and sockname. 802 */ 803 int inet_getname(struct socket *sock, struct sockaddr *uaddr, 804 int peer) 805 { 806 struct sock *sk = sock->sk; 807 struct inet_sock *inet = inet_sk(sk); 808 DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr); 809 int sin_addr_len = sizeof(*sin); 810 811 sin->sin_family = AF_INET; 812 lock_sock(sk); 813 if (peer) { 814 if (!inet->inet_dport || 815 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 816 peer == 1)) { 817 release_sock(sk); 818 return -ENOTCONN; 819 } 820 sin->sin_port = inet->inet_dport; 821 sin->sin_addr.s_addr = inet->inet_daddr; 822 BPF_CGROUP_RUN_SA_PROG(sk, sin, &sin_addr_len, 823 CGROUP_INET4_GETPEERNAME); 824 } else { 825 __be32 addr = inet->inet_rcv_saddr; 826 if (!addr) 827 addr = inet->inet_saddr; 828 sin->sin_port = inet->inet_sport; 829 sin->sin_addr.s_addr = addr; 830 BPF_CGROUP_RUN_SA_PROG(sk, sin, &sin_addr_len, 831 CGROUP_INET4_GETSOCKNAME); 832 } 833 release_sock(sk); 834 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 835 return sin_addr_len; 836 } 837 EXPORT_SYMBOL(inet_getname); 838 839 int inet_send_prepare(struct sock *sk) 840 { 841 sock_rps_record_flow(sk); 842 843 /* We may need to bind the socket. */ 844 if (data_race(!inet_sk(sk)->inet_num) && !sk->sk_prot->no_autobind && 845 inet_autobind(sk)) 846 return -EAGAIN; 847 848 return 0; 849 } 850 EXPORT_SYMBOL_GPL(inet_send_prepare); 851 852 int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) 853 { 854 struct sock *sk = sock->sk; 855 const struct proto *prot; 856 857 if (unlikely(inet_send_prepare(sk))) 858 return -EAGAIN; 859 860 prot = READ_ONCE(sk->sk_prot); 861 return INDIRECT_CALL_2(prot->sendmsg, tcp_sendmsg, udp_sendmsg, 862 sk, msg, size); 863 } 864 EXPORT_SYMBOL(inet_sendmsg); 865 866 void inet_splice_eof(struct socket *sock) 867 { 868 const struct proto *prot; 869 struct sock *sk = sock->sk; 870 871 if (unlikely(inet_send_prepare(sk))) 872 return; 873 874 /* IPV6_ADDRFORM can change sk->sk_prot under us. */ 875 prot = READ_ONCE(sk->sk_prot); 876 if (prot->splice_eof) 877 prot->splice_eof(sock); 878 } 879 EXPORT_SYMBOL_GPL(inet_splice_eof); 880 881 INDIRECT_CALLABLE_DECLARE(int udp_recvmsg(struct sock *, struct msghdr *, 882 size_t, int)); 883 int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 884 int flags) 885 { 886 struct sock *sk = sock->sk; 887 const struct proto *prot; 888 889 if (likely(!(flags & MSG_ERRQUEUE))) 890 sock_rps_record_flow(sk); 891 892 prot = READ_ONCE(sk->sk_prot); 893 return INDIRECT_CALL_2(prot->recvmsg, tcp_recvmsg, udp_recvmsg, 894 sk, msg, size, flags); 895 } 896 EXPORT_SYMBOL(inet_recvmsg); 897 898 int inet_shutdown(struct socket *sock, int how) 899 { 900 struct sock *sk = sock->sk; 901 int err = 0; 902 903 /* This should really check to make sure 904 * the socket is a TCP socket. (WHY AC...) 905 */ 906 how++; /* maps 0->1 has the advantage of making bit 1 rcvs and 907 1->2 bit 2 snds. 908 2->3 */ 909 if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ 910 return -EINVAL; 911 912 lock_sock(sk); 913 if (sock->state == SS_CONNECTING) { 914 if ((1 << sk->sk_state) & 915 (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) 916 sock->state = SS_DISCONNECTING; 917 else 918 sock->state = SS_CONNECTED; 919 } 920 921 switch (sk->sk_state) { 922 case TCP_CLOSE: 923 err = -ENOTCONN; 924 /* Hack to wake up other listeners, who can poll for 925 EPOLLHUP, even on eg. unconnected UDP sockets -- RR */ 926 fallthrough; 927 default: 928 WRITE_ONCE(sk->sk_shutdown, sk->sk_shutdown | how); 929 if (sk->sk_prot->shutdown) 930 sk->sk_prot->shutdown(sk, how); 931 break; 932 933 /* Remaining two branches are temporary solution for missing 934 * close() in multithreaded environment. It is _not_ a good idea, 935 * but we have no choice until close() is repaired at VFS level. 936 */ 937 case TCP_LISTEN: 938 if (!(how & RCV_SHUTDOWN)) 939 break; 940 fallthrough; 941 case TCP_SYN_SENT: 942 err = sk->sk_prot->disconnect(sk, O_NONBLOCK); 943 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 944 break; 945 } 946 947 /* Wake up anyone sleeping in poll. */ 948 sk->sk_state_change(sk); 949 release_sock(sk); 950 return err; 951 } 952 EXPORT_SYMBOL(inet_shutdown); 953 954 /* 955 * ioctl() calls you can issue on an INET socket. Most of these are 956 * device configuration and stuff and very rarely used. Some ioctls 957 * pass on to the socket itself. 958 * 959 * NOTE: I like the idea of a module for the config stuff. ie ifconfig 960 * loads the devconfigure module does its configuring and unloads it. 961 * There's a good 20K of config code hanging around the kernel. 962 */ 963 964 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 965 { 966 struct sock *sk = sock->sk; 967 int err = 0; 968 struct net *net = sock_net(sk); 969 void __user *p = (void __user *)arg; 970 struct ifreq ifr; 971 struct rtentry rt; 972 973 switch (cmd) { 974 case SIOCADDRT: 975 case SIOCDELRT: 976 if (copy_from_user(&rt, p, sizeof(struct rtentry))) 977 return -EFAULT; 978 err = ip_rt_ioctl(net, cmd, &rt); 979 break; 980 case SIOCRTMSG: 981 err = -EINVAL; 982 break; 983 case SIOCDARP: 984 case SIOCGARP: 985 case SIOCSARP: 986 err = arp_ioctl(net, cmd, (void __user *)arg); 987 break; 988 case SIOCGIFADDR: 989 case SIOCGIFBRDADDR: 990 case SIOCGIFNETMASK: 991 case SIOCGIFDSTADDR: 992 case SIOCGIFPFLAGS: 993 if (get_user_ifreq(&ifr, NULL, p)) 994 return -EFAULT; 995 err = devinet_ioctl(net, cmd, &ifr); 996 if (!err && put_user_ifreq(&ifr, p)) 997 err = -EFAULT; 998 break; 999 1000 case SIOCSIFADDR: 1001 case SIOCSIFBRDADDR: 1002 case SIOCSIFNETMASK: 1003 case SIOCSIFDSTADDR: 1004 case SIOCSIFPFLAGS: 1005 case SIOCSIFFLAGS: 1006 if (get_user_ifreq(&ifr, NULL, p)) 1007 return -EFAULT; 1008 err = devinet_ioctl(net, cmd, &ifr); 1009 break; 1010 default: 1011 if (sk->sk_prot->ioctl) 1012 err = sk_ioctl(sk, cmd, (void __user *)arg); 1013 else 1014 err = -ENOIOCTLCMD; 1015 break; 1016 } 1017 return err; 1018 } 1019 EXPORT_SYMBOL(inet_ioctl); 1020 1021 #ifdef CONFIG_COMPAT 1022 static int inet_compat_routing_ioctl(struct sock *sk, unsigned int cmd, 1023 struct compat_rtentry __user *ur) 1024 { 1025 compat_uptr_t rtdev; 1026 struct rtentry rt; 1027 1028 if (copy_from_user(&rt.rt_dst, &ur->rt_dst, 1029 3 * sizeof(struct sockaddr)) || 1030 get_user(rt.rt_flags, &ur->rt_flags) || 1031 get_user(rt.rt_metric, &ur->rt_metric) || 1032 get_user(rt.rt_mtu, &ur->rt_mtu) || 1033 get_user(rt.rt_window, &ur->rt_window) || 1034 get_user(rt.rt_irtt, &ur->rt_irtt) || 1035 get_user(rtdev, &ur->rt_dev)) 1036 return -EFAULT; 1037 1038 rt.rt_dev = compat_ptr(rtdev); 1039 return ip_rt_ioctl(sock_net(sk), cmd, &rt); 1040 } 1041 1042 static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1043 { 1044 void __user *argp = compat_ptr(arg); 1045 struct sock *sk = sock->sk; 1046 1047 switch (cmd) { 1048 case SIOCADDRT: 1049 case SIOCDELRT: 1050 return inet_compat_routing_ioctl(sk, cmd, argp); 1051 default: 1052 if (!sk->sk_prot->compat_ioctl) 1053 return -ENOIOCTLCMD; 1054 return sk->sk_prot->compat_ioctl(sk, cmd, arg); 1055 } 1056 } 1057 #endif /* CONFIG_COMPAT */ 1058 1059 const struct proto_ops inet_stream_ops = { 1060 .family = PF_INET, 1061 .owner = THIS_MODULE, 1062 .release = inet_release, 1063 .bind = inet_bind, 1064 .connect = inet_stream_connect, 1065 .socketpair = sock_no_socketpair, 1066 .accept = inet_accept, 1067 .getname = inet_getname, 1068 .poll = tcp_poll, 1069 .ioctl = inet_ioctl, 1070 .gettstamp = sock_gettstamp, 1071 .listen = inet_listen, 1072 .shutdown = inet_shutdown, 1073 .setsockopt = sock_common_setsockopt, 1074 .getsockopt = sock_common_getsockopt, 1075 .sendmsg = inet_sendmsg, 1076 .recvmsg = inet_recvmsg, 1077 #ifdef CONFIG_MMU 1078 .mmap = tcp_mmap, 1079 #endif 1080 .splice_eof = inet_splice_eof, 1081 .splice_read = tcp_splice_read, 1082 .set_peek_off = sk_set_peek_off, 1083 .read_sock = tcp_read_sock, 1084 .read_skb = tcp_read_skb, 1085 .sendmsg_locked = tcp_sendmsg_locked, 1086 .peek_len = tcp_peek_len, 1087 #ifdef CONFIG_COMPAT 1088 .compat_ioctl = inet_compat_ioctl, 1089 #endif 1090 .set_rcvlowat = tcp_set_rcvlowat, 1091 }; 1092 EXPORT_SYMBOL(inet_stream_ops); 1093 1094 const struct proto_ops inet_dgram_ops = { 1095 .family = PF_INET, 1096 .owner = THIS_MODULE, 1097 .release = inet_release, 1098 .bind = inet_bind, 1099 .connect = inet_dgram_connect, 1100 .socketpair = sock_no_socketpair, 1101 .accept = sock_no_accept, 1102 .getname = inet_getname, 1103 .poll = udp_poll, 1104 .ioctl = inet_ioctl, 1105 .gettstamp = sock_gettstamp, 1106 .listen = sock_no_listen, 1107 .shutdown = inet_shutdown, 1108 .setsockopt = sock_common_setsockopt, 1109 .getsockopt = sock_common_getsockopt, 1110 .sendmsg = inet_sendmsg, 1111 .read_skb = udp_read_skb, 1112 .recvmsg = inet_recvmsg, 1113 .mmap = sock_no_mmap, 1114 .splice_eof = inet_splice_eof, 1115 .set_peek_off = udp_set_peek_off, 1116 #ifdef CONFIG_COMPAT 1117 .compat_ioctl = inet_compat_ioctl, 1118 #endif 1119 }; 1120 EXPORT_SYMBOL(inet_dgram_ops); 1121 1122 /* 1123 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 1124 * udp_poll 1125 */ 1126 static const struct proto_ops inet_sockraw_ops = { 1127 .family = PF_INET, 1128 .owner = THIS_MODULE, 1129 .release = inet_release, 1130 .bind = inet_bind, 1131 .connect = inet_dgram_connect, 1132 .socketpair = sock_no_socketpair, 1133 .accept = sock_no_accept, 1134 .getname = inet_getname, 1135 .poll = datagram_poll, 1136 .ioctl = inet_ioctl, 1137 .gettstamp = sock_gettstamp, 1138 .listen = sock_no_listen, 1139 .shutdown = inet_shutdown, 1140 .setsockopt = sock_common_setsockopt, 1141 .getsockopt = sock_common_getsockopt, 1142 .sendmsg = inet_sendmsg, 1143 .recvmsg = inet_recvmsg, 1144 .mmap = sock_no_mmap, 1145 .splice_eof = inet_splice_eof, 1146 #ifdef CONFIG_COMPAT 1147 .compat_ioctl = inet_compat_ioctl, 1148 #endif 1149 }; 1150 1151 static const struct net_proto_family inet_family_ops = { 1152 .family = PF_INET, 1153 .create = inet_create, 1154 .owner = THIS_MODULE, 1155 }; 1156 1157 /* Upon startup we insert all the elements in inetsw_array[] into 1158 * the linked list inetsw. 1159 */ 1160 static struct inet_protosw inetsw_array[] = 1161 { 1162 { 1163 .type = SOCK_STREAM, 1164 .protocol = IPPROTO_TCP, 1165 .prot = &tcp_prot, 1166 .ops = &inet_stream_ops, 1167 .flags = INET_PROTOSW_PERMANENT | 1168 INET_PROTOSW_ICSK, 1169 }, 1170 1171 { 1172 .type = SOCK_DGRAM, 1173 .protocol = IPPROTO_UDP, 1174 .prot = &udp_prot, 1175 .ops = &inet_dgram_ops, 1176 .flags = INET_PROTOSW_PERMANENT, 1177 }, 1178 1179 { 1180 .type = SOCK_DGRAM, 1181 .protocol = IPPROTO_ICMP, 1182 .prot = &ping_prot, 1183 .ops = &inet_sockraw_ops, 1184 .flags = INET_PROTOSW_REUSE, 1185 }, 1186 1187 { 1188 .type = SOCK_RAW, 1189 .protocol = IPPROTO_IP, /* wild card */ 1190 .prot = &raw_prot, 1191 .ops = &inet_sockraw_ops, 1192 .flags = INET_PROTOSW_REUSE, 1193 } 1194 }; 1195 1196 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) 1197 1198 void inet_register_protosw(struct inet_protosw *p) 1199 { 1200 struct list_head *lh; 1201 struct inet_protosw *answer; 1202 int protocol = p->protocol; 1203 struct list_head *last_perm; 1204 1205 spin_lock_bh(&inetsw_lock); 1206 1207 if (p->type >= SOCK_MAX) 1208 goto out_illegal; 1209 1210 /* If we are trying to override a permanent protocol, bail. */ 1211 last_perm = &inetsw[p->type]; 1212 list_for_each(lh, &inetsw[p->type]) { 1213 answer = list_entry(lh, struct inet_protosw, list); 1214 /* Check only the non-wild match. */ 1215 if ((INET_PROTOSW_PERMANENT & answer->flags) == 0) 1216 break; 1217 if (protocol == answer->protocol) 1218 goto out_permanent; 1219 last_perm = lh; 1220 } 1221 1222 /* Add the new entry after the last permanent entry if any, so that 1223 * the new entry does not override a permanent entry when matched with 1224 * a wild-card protocol. But it is allowed to override any existing 1225 * non-permanent entry. This means that when we remove this entry, the 1226 * system automatically returns to the old behavior. 1227 */ 1228 list_add_rcu(&p->list, last_perm); 1229 out: 1230 spin_unlock_bh(&inetsw_lock); 1231 1232 return; 1233 1234 out_permanent: 1235 pr_err("Attempt to override permanent protocol %d\n", protocol); 1236 goto out; 1237 1238 out_illegal: 1239 pr_err("Ignoring attempt to register invalid socket type %d\n", 1240 p->type); 1241 goto out; 1242 } 1243 EXPORT_SYMBOL(inet_register_protosw); 1244 1245 void inet_unregister_protosw(struct inet_protosw *p) 1246 { 1247 if (INET_PROTOSW_PERMANENT & p->flags) { 1248 pr_err("Attempt to unregister permanent protocol %d\n", 1249 p->protocol); 1250 } else { 1251 spin_lock_bh(&inetsw_lock); 1252 list_del_rcu(&p->list); 1253 spin_unlock_bh(&inetsw_lock); 1254 1255 synchronize_net(); 1256 } 1257 } 1258 EXPORT_SYMBOL(inet_unregister_protosw); 1259 1260 static int inet_sk_reselect_saddr(struct sock *sk) 1261 { 1262 struct inet_sock *inet = inet_sk(sk); 1263 __be32 old_saddr = inet->inet_saddr; 1264 __be32 daddr = inet->inet_daddr; 1265 struct flowi4 *fl4; 1266 struct rtable *rt; 1267 __be32 new_saddr; 1268 struct ip_options_rcu *inet_opt; 1269 int err; 1270 1271 inet_opt = rcu_dereference_protected(inet->inet_opt, 1272 lockdep_sock_is_held(sk)); 1273 if (inet_opt && inet_opt->opt.srr) 1274 daddr = inet_opt->opt.faddr; 1275 1276 /* Query new route. */ 1277 fl4 = &inet->cork.fl.u.ip4; 1278 rt = ip_route_connect(fl4, daddr, 0, sk->sk_bound_dev_if, 1279 sk->sk_protocol, inet->inet_sport, 1280 inet->inet_dport, sk); 1281 if (IS_ERR(rt)) 1282 return PTR_ERR(rt); 1283 1284 new_saddr = fl4->saddr; 1285 1286 if (new_saddr == old_saddr) { 1287 sk_setup_caps(sk, &rt->dst); 1288 return 0; 1289 } 1290 1291 err = inet_bhash2_update_saddr(sk, &new_saddr, AF_INET); 1292 if (err) { 1293 ip_rt_put(rt); 1294 return err; 1295 } 1296 1297 sk_setup_caps(sk, &rt->dst); 1298 1299 if (READ_ONCE(sock_net(sk)->ipv4.sysctl_ip_dynaddr) > 1) { 1300 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n", 1301 __func__, &old_saddr, &new_saddr); 1302 } 1303 1304 /* 1305 * XXX The only one ugly spot where we need to 1306 * XXX really change the sockets identity after 1307 * XXX it has entered the hashes. -DaveM 1308 * 1309 * Besides that, it does not check for connection 1310 * uniqueness. Wait for troubles. 1311 */ 1312 return __sk_prot_rehash(sk); 1313 } 1314 1315 int inet_sk_rebuild_header(struct sock *sk) 1316 { 1317 struct rtable *rt = dst_rtable(__sk_dst_check(sk, 0)); 1318 struct inet_sock *inet = inet_sk(sk); 1319 struct flowi4 *fl4; 1320 int err; 1321 1322 /* Route is OK, nothing to do. */ 1323 if (rt) 1324 return 0; 1325 1326 /* Reroute. */ 1327 fl4 = &inet->cork.fl.u.ip4; 1328 inet_sk_init_flowi4(inet, fl4); 1329 rt = ip_route_output_flow(sock_net(sk), fl4, sk); 1330 if (!IS_ERR(rt)) { 1331 err = 0; 1332 sk_setup_caps(sk, &rt->dst); 1333 } else { 1334 err = PTR_ERR(rt); 1335 1336 /* Routing failed... */ 1337 sk->sk_route_caps = 0; 1338 1339 if (!READ_ONCE(sock_net(sk)->ipv4.sysctl_ip_dynaddr) || 1340 sk->sk_state != TCP_SYN_SENT || 1341 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 1342 (err = inet_sk_reselect_saddr(sk)) != 0) 1343 WRITE_ONCE(sk->sk_err_soft, -err); 1344 } 1345 1346 return err; 1347 } 1348 EXPORT_SYMBOL(inet_sk_rebuild_header); 1349 1350 void inet_sk_set_state(struct sock *sk, int state) 1351 { 1352 trace_inet_sock_set_state(sk, sk->sk_state, state); 1353 sk->sk_state = state; 1354 } 1355 EXPORT_SYMBOL(inet_sk_set_state); 1356 1357 void inet_sk_state_store(struct sock *sk, int newstate) 1358 { 1359 trace_inet_sock_set_state(sk, sk->sk_state, newstate); 1360 smp_store_release(&sk->sk_state, newstate); 1361 } 1362 1363 struct sk_buff *inet_gso_segment(struct sk_buff *skb, 1364 netdev_features_t features) 1365 { 1366 bool udpfrag = false, fixedid = false, gso_partial, encap; 1367 struct sk_buff *segs = ERR_PTR(-EINVAL); 1368 const struct net_offload *ops; 1369 unsigned int offset = 0; 1370 struct iphdr *iph; 1371 int proto, tot_len; 1372 int nhoff; 1373 int ihl; 1374 int id; 1375 1376 skb_reset_network_header(skb); 1377 nhoff = skb_network_header(skb) - skb_mac_header(skb); 1378 if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1379 goto out; 1380 1381 iph = ip_hdr(skb); 1382 ihl = iph->ihl * 4; 1383 if (ihl < sizeof(*iph)) 1384 goto out; 1385 1386 id = ntohs(iph->id); 1387 proto = iph->protocol; 1388 1389 /* Warning: after this point, iph might be no longer valid */ 1390 if (unlikely(!pskb_may_pull(skb, ihl))) 1391 goto out; 1392 __skb_pull(skb, ihl); 1393 1394 encap = SKB_GSO_CB(skb)->encap_level > 0; 1395 if (encap) 1396 features &= skb->dev->hw_enc_features; 1397 SKB_GSO_CB(skb)->encap_level += ihl; 1398 1399 skb_reset_transport_header(skb); 1400 1401 segs = ERR_PTR(-EPROTONOSUPPORT); 1402 1403 fixedid = !!(skb_shinfo(skb)->gso_type & (SKB_GSO_TCP_FIXEDID << encap)); 1404 1405 if (!skb->encapsulation || encap) 1406 udpfrag = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP); 1407 1408 ops = rcu_dereference(inet_offloads[proto]); 1409 if (likely(ops && ops->callbacks.gso_segment)) { 1410 segs = ops->callbacks.gso_segment(skb, features); 1411 if (!segs) 1412 skb->network_header = skb_mac_header(skb) + nhoff - skb->head; 1413 } 1414 1415 if (IS_ERR_OR_NULL(segs)) 1416 goto out; 1417 1418 gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL); 1419 1420 skb = segs; 1421 do { 1422 iph = (struct iphdr *)(skb_mac_header(skb) + nhoff); 1423 if (udpfrag) { 1424 iph->frag_off = htons(offset >> 3); 1425 if (skb->next) 1426 iph->frag_off |= htons(IP_MF); 1427 offset += skb->len - nhoff - ihl; 1428 tot_len = skb->len - nhoff; 1429 } else if (skb_is_gso(skb)) { 1430 if (!fixedid) { 1431 iph->id = htons(id); 1432 id += skb_shinfo(skb)->gso_segs; 1433 } 1434 1435 if (gso_partial) 1436 tot_len = skb_shinfo(skb)->gso_size + 1437 SKB_GSO_CB(skb)->data_offset + 1438 skb->head - (unsigned char *)iph; 1439 else 1440 tot_len = skb->len - nhoff; 1441 } else { 1442 if (!fixedid) 1443 iph->id = htons(id++); 1444 tot_len = skb->len - nhoff; 1445 } 1446 iph->tot_len = htons(tot_len); 1447 ip_send_check(iph); 1448 if (encap) 1449 skb_reset_inner_headers(skb); 1450 skb->network_header = (u8 *)iph - skb->head; 1451 skb_reset_mac_len(skb); 1452 } while ((skb = skb->next)); 1453 1454 out: 1455 return segs; 1456 } 1457 1458 static struct sk_buff *ipip_gso_segment(struct sk_buff *skb, 1459 netdev_features_t features) 1460 { 1461 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_IPXIP4)) 1462 return ERR_PTR(-EINVAL); 1463 1464 return inet_gso_segment(skb, features); 1465 } 1466 1467 struct sk_buff *inet_gro_receive(struct list_head *head, struct sk_buff *skb) 1468 { 1469 const struct net_offload *ops; 1470 struct sk_buff *pp = NULL; 1471 const struct iphdr *iph; 1472 struct sk_buff *p; 1473 unsigned int hlen; 1474 unsigned int off; 1475 int flush = 1; 1476 int proto; 1477 1478 off = skb_gro_offset(skb); 1479 hlen = off + sizeof(*iph); 1480 iph = skb_gro_header(skb, hlen, off); 1481 if (unlikely(!iph)) 1482 goto out; 1483 1484 proto = iph->protocol; 1485 1486 ops = rcu_dereference(inet_offloads[proto]); 1487 if (!ops || !ops->callbacks.gro_receive) 1488 goto out; 1489 1490 if (*(u8 *)iph != 0x45) 1491 goto out; 1492 1493 if (ip_is_fragment(iph)) 1494 goto out; 1495 1496 if (unlikely(ip_fast_csum((u8 *)iph, 5))) 1497 goto out; 1498 1499 NAPI_GRO_CB(skb)->proto = proto; 1500 flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (ntohl(*(__be32 *)&iph->id) & ~IP_DF)); 1501 1502 list_for_each_entry(p, head, list) { 1503 struct iphdr *iph2; 1504 1505 if (!NAPI_GRO_CB(p)->same_flow) 1506 continue; 1507 1508 iph2 = (struct iphdr *)(p->data + off); 1509 /* The above works because, with the exception of the top 1510 * (inner most) layer, we only aggregate pkts with the same 1511 * hdr length so all the hdrs we'll need to verify will start 1512 * at the same offset. 1513 */ 1514 if ((iph->protocol ^ iph2->protocol) | 1515 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) | 1516 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) { 1517 NAPI_GRO_CB(p)->same_flow = 0; 1518 continue; 1519 } 1520 } 1521 1522 NAPI_GRO_CB(skb)->flush |= flush; 1523 NAPI_GRO_CB(skb)->network_offsets[NAPI_GRO_CB(skb)->encap_mark] = off; 1524 1525 /* Note : No need to call skb_gro_postpull_rcsum() here, 1526 * as we already checked checksum over ipv4 header was 0 1527 */ 1528 skb_gro_pull(skb, sizeof(*iph)); 1529 skb_set_transport_header(skb, skb_gro_offset(skb)); 1530 1531 pp = indirect_call_gro_receive(tcp4_gro_receive, udp4_gro_receive, 1532 ops->callbacks.gro_receive, head, skb); 1533 1534 out: 1535 skb_gro_flush_final(skb, pp, flush); 1536 1537 return pp; 1538 } 1539 1540 static struct sk_buff *ipip_gro_receive(struct list_head *head, 1541 struct sk_buff *skb) 1542 { 1543 if (NAPI_GRO_CB(skb)->encap_mark) { 1544 NAPI_GRO_CB(skb)->flush = 1; 1545 return NULL; 1546 } 1547 1548 NAPI_GRO_CB(skb)->encap_mark = 1; 1549 1550 return inet_gro_receive(head, skb); 1551 } 1552 1553 #define SECONDS_PER_DAY 86400 1554 1555 /* inet_current_timestamp - Return IP network timestamp 1556 * 1557 * Return milliseconds since midnight in network byte order. 1558 */ 1559 __be32 inet_current_timestamp(void) 1560 { 1561 u32 secs; 1562 u32 msecs; 1563 struct timespec64 ts; 1564 1565 ktime_get_real_ts64(&ts); 1566 1567 /* Get secs since midnight. */ 1568 (void)div_u64_rem(ts.tv_sec, SECONDS_PER_DAY, &secs); 1569 /* Convert to msecs. */ 1570 msecs = secs * MSEC_PER_SEC; 1571 /* Convert nsec to msec. */ 1572 msecs += (u32)ts.tv_nsec / NSEC_PER_MSEC; 1573 1574 /* Convert to network byte order. */ 1575 return htonl(msecs); 1576 } 1577 EXPORT_SYMBOL(inet_current_timestamp); 1578 1579 int inet_recv_error(struct sock *sk, struct msghdr *msg, int len) 1580 { 1581 unsigned int family = READ_ONCE(sk->sk_family); 1582 1583 if (family == AF_INET) 1584 return ip_recv_error(sk, msg, len); 1585 #if IS_ENABLED(CONFIG_IPV6) 1586 if (family == AF_INET6) 1587 return pingv6_ops.ipv6_recv_error(sk, msg, len); 1588 #endif 1589 return -EINVAL; 1590 } 1591 EXPORT_SYMBOL(inet_recv_error); 1592 1593 int inet_gro_complete(struct sk_buff *skb, int nhoff) 1594 { 1595 struct iphdr *iph = (struct iphdr *)(skb->data + nhoff); 1596 const struct net_offload *ops; 1597 __be16 totlen = iph->tot_len; 1598 int proto = iph->protocol; 1599 int err = -ENOSYS; 1600 1601 if (skb->encapsulation) { 1602 skb_set_inner_protocol(skb, cpu_to_be16(ETH_P_IP)); 1603 skb_set_inner_network_header(skb, nhoff); 1604 } 1605 1606 iph_set_totlen(iph, skb->len - nhoff); 1607 csum_replace2(&iph->check, totlen, iph->tot_len); 1608 1609 ops = rcu_dereference(inet_offloads[proto]); 1610 if (WARN_ON(!ops || !ops->callbacks.gro_complete)) 1611 goto out; 1612 1613 /* Only need to add sizeof(*iph) to get to the next hdr below 1614 * because any hdr with option will have been flushed in 1615 * inet_gro_receive(). 1616 */ 1617 err = INDIRECT_CALL_2(ops->callbacks.gro_complete, 1618 tcp4_gro_complete, udp4_gro_complete, 1619 skb, nhoff + sizeof(*iph)); 1620 1621 out: 1622 return err; 1623 } 1624 1625 static int ipip_gro_complete(struct sk_buff *skb, int nhoff) 1626 { 1627 skb->encapsulation = 1; 1628 skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4; 1629 return inet_gro_complete(skb, nhoff); 1630 } 1631 1632 int inet_ctl_sock_create(struct sock **sk, unsigned short family, 1633 unsigned short type, unsigned char protocol, 1634 struct net *net) 1635 { 1636 struct socket *sock; 1637 int rc = sock_create_kern(net, family, type, protocol, &sock); 1638 1639 if (rc == 0) { 1640 *sk = sock->sk; 1641 (*sk)->sk_allocation = GFP_ATOMIC; 1642 (*sk)->sk_use_task_frag = false; 1643 /* 1644 * Unhash it so that IP input processing does not even see it, 1645 * we do not wish this socket to see incoming packets. 1646 */ 1647 (*sk)->sk_prot->unhash(*sk); 1648 } 1649 return rc; 1650 } 1651 EXPORT_SYMBOL_GPL(inet_ctl_sock_create); 1652 1653 unsigned long snmp_fold_field(void __percpu *mib, int offt) 1654 { 1655 unsigned long res = 0; 1656 int i; 1657 1658 for_each_possible_cpu(i) 1659 res += snmp_get_cpu_field(mib, i, offt); 1660 return res; 1661 } 1662 EXPORT_SYMBOL_GPL(snmp_fold_field); 1663 1664 #if BITS_PER_LONG==32 1665 1666 u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offt, 1667 size_t syncp_offset) 1668 { 1669 void *bhptr; 1670 struct u64_stats_sync *syncp; 1671 u64 v; 1672 unsigned int start; 1673 1674 bhptr = per_cpu_ptr(mib, cpu); 1675 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset); 1676 do { 1677 start = u64_stats_fetch_begin(syncp); 1678 v = *(((u64 *)bhptr) + offt); 1679 } while (u64_stats_fetch_retry(syncp, start)); 1680 1681 return v; 1682 } 1683 EXPORT_SYMBOL_GPL(snmp_get_cpu_field64); 1684 1685 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset) 1686 { 1687 u64 res = 0; 1688 int cpu; 1689 1690 for_each_possible_cpu(cpu) { 1691 res += snmp_get_cpu_field64(mib, cpu, offt, syncp_offset); 1692 } 1693 return res; 1694 } 1695 EXPORT_SYMBOL_GPL(snmp_fold_field64); 1696 #endif 1697 1698 #ifdef CONFIG_IP_MULTICAST 1699 static const struct net_protocol igmp_protocol = { 1700 .handler = igmp_rcv, 1701 }; 1702 #endif 1703 1704 static const struct net_protocol icmp_protocol = { 1705 .handler = icmp_rcv, 1706 .err_handler = icmp_err, 1707 .no_policy = 1, 1708 }; 1709 1710 static __net_init int ipv4_mib_init_net(struct net *net) 1711 { 1712 int i; 1713 1714 net->mib.tcp_statistics = alloc_percpu(struct tcp_mib); 1715 if (!net->mib.tcp_statistics) 1716 goto err_tcp_mib; 1717 net->mib.ip_statistics = alloc_percpu(struct ipstats_mib); 1718 if (!net->mib.ip_statistics) 1719 goto err_ip_mib; 1720 1721 for_each_possible_cpu(i) { 1722 struct ipstats_mib *af_inet_stats; 1723 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i); 1724 u64_stats_init(&af_inet_stats->syncp); 1725 } 1726 1727 net->mib.net_statistics = alloc_percpu(struct linux_mib); 1728 if (!net->mib.net_statistics) 1729 goto err_net_mib; 1730 net->mib.udp_statistics = alloc_percpu(struct udp_mib); 1731 if (!net->mib.udp_statistics) 1732 goto err_udp_mib; 1733 net->mib.udplite_statistics = alloc_percpu(struct udp_mib); 1734 if (!net->mib.udplite_statistics) 1735 goto err_udplite_mib; 1736 net->mib.icmp_statistics = alloc_percpu(struct icmp_mib); 1737 if (!net->mib.icmp_statistics) 1738 goto err_icmp_mib; 1739 net->mib.icmpmsg_statistics = kzalloc_obj(struct icmpmsg_mib); 1740 if (!net->mib.icmpmsg_statistics) 1741 goto err_icmpmsg_mib; 1742 1743 tcp_mib_init(net); 1744 return 0; 1745 1746 err_icmpmsg_mib: 1747 free_percpu(net->mib.icmp_statistics); 1748 err_icmp_mib: 1749 free_percpu(net->mib.udplite_statistics); 1750 err_udplite_mib: 1751 free_percpu(net->mib.udp_statistics); 1752 err_udp_mib: 1753 free_percpu(net->mib.net_statistics); 1754 err_net_mib: 1755 free_percpu(net->mib.ip_statistics); 1756 err_ip_mib: 1757 free_percpu(net->mib.tcp_statistics); 1758 err_tcp_mib: 1759 return -ENOMEM; 1760 } 1761 1762 static __net_exit void ipv4_mib_exit_net(struct net *net) 1763 { 1764 kfree(net->mib.icmpmsg_statistics); 1765 free_percpu(net->mib.icmp_statistics); 1766 free_percpu(net->mib.udplite_statistics); 1767 free_percpu(net->mib.udp_statistics); 1768 free_percpu(net->mib.net_statistics); 1769 free_percpu(net->mib.ip_statistics); 1770 free_percpu(net->mib.tcp_statistics); 1771 #ifdef CONFIG_MPTCP 1772 /* allocated on demand, see mptcp_init_sock() */ 1773 free_percpu(net->mib.mptcp_statistics); 1774 #endif 1775 } 1776 1777 static __net_initdata struct pernet_operations ipv4_mib_ops = { 1778 .init = ipv4_mib_init_net, 1779 .exit = ipv4_mib_exit_net, 1780 }; 1781 1782 static int __init init_ipv4_mibs(void) 1783 { 1784 return register_pernet_subsys(&ipv4_mib_ops); 1785 } 1786 1787 static __net_init int inet_init_net(struct net *net) 1788 { 1789 /* 1790 * Set defaults for local port range 1791 */ 1792 net->ipv4.ip_local_ports.range = 60999u << 16 | 32768u; 1793 1794 seqlock_init(&net->ipv4.ping_group_range.lock); 1795 /* 1796 * Sane defaults - nobody may create ping sockets. 1797 * Boot scripts should set this to distro-specific group. 1798 */ 1799 net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1); 1800 net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0); 1801 1802 /* Default values for sysctl-controlled parameters. 1803 * We set them here, in case sysctl is not compiled. 1804 */ 1805 net->ipv4.sysctl_ip_default_ttl = IPDEFTTL; 1806 net->ipv4.sysctl_ip_fwd_update_priority = 1; 1807 net->ipv4.sysctl_ip_dynaddr = 0; 1808 net->ipv4.sysctl_ip_early_demux = 1; 1809 net->ipv4.sysctl_udp_early_demux = 1; 1810 net->ipv4.sysctl_tcp_early_demux = 1; 1811 net->ipv4.sysctl_nexthop_compat_mode = 1; 1812 #ifdef CONFIG_SYSCTL 1813 net->ipv4.sysctl_ip_prot_sock = PROT_SOCK; 1814 #endif 1815 1816 /* Some igmp sysctl, whose values are always used */ 1817 net->ipv4.sysctl_igmp_max_memberships = 20; 1818 net->ipv4.sysctl_igmp_max_msf = 10; 1819 /* IGMP reports for link-local multicast groups are enabled by default */ 1820 net->ipv4.sysctl_igmp_llm_reports = 1; 1821 net->ipv4.sysctl_igmp_qrv = 2; 1822 1823 net->ipv4.sysctl_fib_notify_on_flag_change = 0; 1824 1825 return 0; 1826 } 1827 1828 static __net_initdata struct pernet_operations af_inet_ops = { 1829 .init = inet_init_net, 1830 }; 1831 1832 static int __init init_inet_pernet_ops(void) 1833 { 1834 return register_pernet_subsys(&af_inet_ops); 1835 } 1836 1837 static int ipv4_proc_init(void); 1838 1839 /* 1840 * IP protocol layer initialiser 1841 */ 1842 1843 1844 static const struct net_offload ipip_offload = { 1845 .callbacks = { 1846 .gso_segment = ipip_gso_segment, 1847 .gro_receive = ipip_gro_receive, 1848 .gro_complete = ipip_gro_complete, 1849 }, 1850 }; 1851 1852 static int __init ipip_offload_init(void) 1853 { 1854 return inet_add_offload(&ipip_offload, IPPROTO_IPIP); 1855 } 1856 1857 static int __init ipv4_offload_init(void) 1858 { 1859 /* 1860 * Add offloads 1861 */ 1862 if (udpv4_offload_init() < 0) 1863 pr_crit("%s: Cannot add UDP protocol offload\n", __func__); 1864 if (tcpv4_offload_init() < 0) 1865 pr_crit("%s: Cannot add TCP protocol offload\n", __func__); 1866 if (ipip_offload_init() < 0) 1867 pr_crit("%s: Cannot add IPIP protocol offload\n", __func__); 1868 1869 net_hotdata.ip_packet_offload = (struct packet_offload) { 1870 .type = cpu_to_be16(ETH_P_IP), 1871 .callbacks = { 1872 .gso_segment = inet_gso_segment, 1873 .gro_receive = inet_gro_receive, 1874 .gro_complete = inet_gro_complete, 1875 }, 1876 }; 1877 dev_add_offload(&net_hotdata.ip_packet_offload); 1878 return 0; 1879 } 1880 1881 fs_initcall(ipv4_offload_init); 1882 1883 static struct packet_type ip_packet_type __read_mostly = { 1884 .type = cpu_to_be16(ETH_P_IP), 1885 .func = ip_rcv, 1886 .list_func = ip_list_rcv, 1887 }; 1888 1889 static int __init inet_init(void) 1890 { 1891 struct inet_protosw *q; 1892 struct list_head *r; 1893 int rc; 1894 1895 sock_skb_cb_check_size(sizeof(struct inet_skb_parm)); 1896 1897 raw_hashinfo_init(&raw_v4_hashinfo); 1898 1899 rc = proto_register(&tcp_prot, 1); 1900 if (rc) 1901 goto out; 1902 1903 rc = proto_register(&udp_prot, 1); 1904 if (rc) 1905 goto out_unregister_tcp_proto; 1906 1907 rc = proto_register(&raw_prot, 1); 1908 if (rc) 1909 goto out_unregister_udp_proto; 1910 1911 rc = proto_register(&ping_prot, 1); 1912 if (rc) 1913 goto out_unregister_raw_proto; 1914 1915 /* 1916 * Tell SOCKET that we are alive... 1917 */ 1918 1919 (void)sock_register(&inet_family_ops); 1920 1921 #ifdef CONFIG_SYSCTL 1922 ip_static_sysctl_init(); 1923 #endif 1924 1925 /* 1926 * Add all the base protocols. 1927 */ 1928 1929 if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 1930 pr_crit("%s: Cannot add ICMP protocol\n", __func__); 1931 1932 net_hotdata.udp_protocol = (struct net_protocol) { 1933 .handler = udp_rcv, 1934 .err_handler = udp_err, 1935 .no_policy = 1, 1936 }; 1937 if (inet_add_protocol(&net_hotdata.udp_protocol, IPPROTO_UDP) < 0) 1938 pr_crit("%s: Cannot add UDP protocol\n", __func__); 1939 1940 net_hotdata.tcp_protocol = (struct net_protocol) { 1941 .handler = tcp_v4_rcv, 1942 .err_handler = tcp_v4_err, 1943 .no_policy = 1, 1944 .icmp_strict_tag_validation = 1, 1945 }; 1946 if (inet_add_protocol(&net_hotdata.tcp_protocol, IPPROTO_TCP) < 0) 1947 pr_crit("%s: Cannot add TCP protocol\n", __func__); 1948 #ifdef CONFIG_IP_MULTICAST 1949 if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 1950 pr_crit("%s: Cannot add IGMP protocol\n", __func__); 1951 #endif 1952 1953 /* Register the socket-side information for inet_create. */ 1954 for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 1955 INIT_LIST_HEAD(r); 1956 1957 for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 1958 inet_register_protosw(q); 1959 1960 /* 1961 * Set the ARP module up 1962 */ 1963 1964 arp_init(); 1965 1966 /* 1967 * Set the IP module up 1968 */ 1969 1970 ip_init(); 1971 1972 /* Initialise per-cpu ipv4 mibs */ 1973 if (init_ipv4_mibs()) 1974 panic("%s: Cannot init ipv4 mibs\n", __func__); 1975 1976 /* Setup TCP slab cache for open requests. */ 1977 tcp_init(); 1978 1979 /* Setup UDP memory threshold */ 1980 udp_init(); 1981 1982 /* Add UDP-Lite (RFC 3828) */ 1983 udplite4_register(); 1984 1985 raw_init(); 1986 1987 ping_init(); 1988 1989 /* 1990 * Set the ICMP layer up 1991 */ 1992 1993 if (icmp_init() < 0) 1994 panic("Failed to create the ICMP control socket.\n"); 1995 1996 /* 1997 * Initialise the multicast router 1998 */ 1999 #if defined(CONFIG_IP_MROUTE) 2000 if (ip_mr_init()) 2001 pr_crit("%s: Cannot init ipv4 mroute\n", __func__); 2002 #endif 2003 2004 if (init_inet_pernet_ops()) 2005 pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__); 2006 2007 ipv4_proc_init(); 2008 2009 ipfrag_init(); 2010 2011 dev_add_pack(&ip_packet_type); 2012 2013 ip_tunnel_core_init(); 2014 2015 rc = 0; 2016 out: 2017 return rc; 2018 out_unregister_raw_proto: 2019 proto_unregister(&raw_prot); 2020 out_unregister_udp_proto: 2021 proto_unregister(&udp_prot); 2022 out_unregister_tcp_proto: 2023 proto_unregister(&tcp_prot); 2024 goto out; 2025 } 2026 2027 fs_initcall(inet_init); 2028 2029 /* ------------------------------------------------------------------------ */ 2030 2031 #ifdef CONFIG_PROC_FS 2032 static int __init ipv4_proc_init(void) 2033 { 2034 int rc = 0; 2035 2036 if (raw_proc_init()) 2037 goto out_raw; 2038 if (tcp4_proc_init()) 2039 goto out_tcp; 2040 if (udp4_proc_init()) 2041 goto out_udp; 2042 if (ping_proc_init()) 2043 goto out_ping; 2044 if (ip_misc_proc_init()) 2045 goto out_misc; 2046 out: 2047 return rc; 2048 out_misc: 2049 ping_proc_exit(); 2050 out_ping: 2051 udp4_proc_exit(); 2052 out_udp: 2053 tcp4_proc_exit(); 2054 out_tcp: 2055 raw_proc_exit(); 2056 out_raw: 2057 rc = -ENOMEM; 2058 goto out; 2059 } 2060 2061 #else /* CONFIG_PROC_FS */ 2062 static int __init ipv4_proc_init(void) 2063 { 2064 return 0; 2065 } 2066 #endif /* CONFIG_PROC_FS */ 2067