1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * X.25 Packet Layer release 002 4 * 5 * This is ALPHA test software. This code may break your machine, 6 * randomly fail to work with new releases, misbehave and/or generally 7 * screw up. It might even work. 8 * 9 * This code REQUIRES 2.1.15 or higher 10 * 11 * History 12 * X.25 001 Jonathan Naylor Started coding. 13 * X.25 002 Jonathan Naylor Centralised disconnect handling. 14 * New timer architecture. 15 * 2000-03-11 Henner Eisen MSG_EOR handling more POSIX compliant. 16 * 2000-03-22 Daniela Squassoni Allowed disabling/enabling of 17 * facilities negotiation and increased 18 * the throughput upper limit. 19 * 2000-08-27 Arnaldo C. Melo s/suser/capable/ + micro cleanups 20 * 2000-09-04 Henner Eisen Set sock->state in x25_accept(). 21 * Fixed x25_output() related skb leakage. 22 * 2000-10-02 Henner Eisen Made x25_kick() single threaded per socket. 23 * 2000-10-27 Henner Eisen MSG_DONTWAIT for fragment allocation. 24 * 2000-11-14 Henner Eisen Closing datalink from NETDEV_GOING_DOWN 25 * 2002-10-06 Arnaldo C. Melo Get rid of cli/sti, move proc stuff to 26 * x25_proc.c, using seq_file 27 * 2005-04-02 Shaun Pereira Selective sub address matching 28 * with call user data 29 * 2005-04-15 Shaun Pereira Fast select with no restriction on 30 * response 31 */ 32 33#define pr_fmt(fmt) "X25: " fmt 34 35#include <linux/module.h> 36#include <linux/capability.h> 37#include <linux/errno.h> 38#include <linux/kernel.h> 39#include <linux/sched/signal.h> 40#include <linux/timer.h> 41#include <linux/string.h> 42#include <linux/net.h> 43#include <linux/netdevice.h> 44#include <linux/if_arp.h> 45#include <linux/skbuff.h> 46#include <linux/slab.h> 47#include <net/sock.h> 48#include <net/tcp_states.h> 49#include <linux/uaccess.h> 50#include <linux/fcntl.h> 51#include <linux/termios.h> /* For TIOCINQ/OUTQ */ 52#include <linux/notifier.h> 53#include <linux/init.h> 54#include <linux/compat.h> 55#include <linux/ctype.h> 56 57#include <net/x25.h> 58#include <net/compat.h> 59 60int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20; 61int sysctl_x25_call_request_timeout = X25_DEFAULT_T21; 62int sysctl_x25_reset_request_timeout = X25_DEFAULT_T22; 63int sysctl_x25_clear_request_timeout = X25_DEFAULT_T23; 64int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2; 65int sysctl_x25_forward = 0; 66 67HLIST_HEAD(x25_list); 68DEFINE_RWLOCK(x25_list_lock); 69 70static const struct proto_ops x25_proto_ops; 71 72static const struct x25_address null_x25_address = {" "}; 73 74#ifdef CONFIG_COMPAT 75struct compat_x25_subscrip_struct { 76 char device[200-sizeof(compat_ulong_t)]; 77 compat_ulong_t global_facil_mask; 78 compat_uint_t extended; 79}; 80#endif 81 82 83int x25_parse_address_block(struct sk_buff *skb, 84 struct x25_address *called_addr, 85 struct x25_address *calling_addr) 86{ 87 unsigned char len; 88 int needed; 89 int rc; 90 91 if (!pskb_may_pull(skb, 1)) { 92 /* packet has no address block */ 93 rc = 0; 94 goto empty; 95 } 96 97 len = *skb->data; 98 needed = 1 + ((len >> 4) + (len & 0x0f) + 1) / 2; 99 100 if (!pskb_may_pull(skb, needed)) { 101 /* packet is too short to hold the addresses it claims 102 to hold */ 103 rc = -1; 104 goto empty; 105 } 106 107 return x25_addr_ntoa(skb->data, called_addr, calling_addr); 108 109empty: 110 *called_addr->x25_addr = 0; 111 *calling_addr->x25_addr = 0; 112 113 return rc; 114} 115 116 117int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr, 118 struct x25_address *calling_addr) 119{ 120 unsigned int called_len, calling_len; 121 char *called, *calling; 122 unsigned int i; 123 124 called_len = (*p >> 0) & 0x0F; 125 calling_len = (*p >> 4) & 0x0F; 126 127 called = called_addr->x25_addr; 128 calling = calling_addr->x25_addr; 129 p++; 130 131 for (i = 0; i < (called_len + calling_len); i++) { 132 if (i < called_len) { 133 if (i % 2 != 0) { 134 *called++ = ((*p >> 0) & 0x0F) + '0'; 135 p++; 136 } else { 137 *called++ = ((*p >> 4) & 0x0F) + '0'; 138 } 139 } else { 140 if (i % 2 != 0) { 141 *calling++ = ((*p >> 0) & 0x0F) + '0'; 142 p++; 143 } else { 144 *calling++ = ((*p >> 4) & 0x0F) + '0'; 145 } 146 } 147 } 148 149 *called = *calling = '\0'; 150 151 return 1 + (called_len + calling_len + 1) / 2; 152} 153 154int x25_addr_aton(unsigned char *p, struct x25_address *called_addr, 155 struct x25_address *calling_addr) 156{ 157 unsigned int called_len, calling_len; 158 char *called, *calling; 159 int i; 160 161 called = called_addr->x25_addr; 162 calling = calling_addr->x25_addr; 163 164 called_len = strlen(called); 165 calling_len = strlen(calling); 166 167 *p++ = (calling_len << 4) | (called_len << 0); 168 169 for (i = 0; i < (called_len + calling_len); i++) { 170 if (i < called_len) { 171 if (i % 2 != 0) { 172 *p |= (*called++ - '0') << 0; 173 p++; 174 } else { 175 *p = 0x00; 176 *p |= (*called++ - '0') << 4; 177 } 178 } else { 179 if (i % 2 != 0) { 180 *p |= (*calling++ - '0') << 0; 181 p++; 182 } else { 183 *p = 0x00; 184 *p |= (*calling++ - '0') << 4; 185 } 186 } 187 } 188 189 return 1 + (called_len + calling_len + 1) / 2; 190} 191 192/* 193 * Socket removal during an interrupt is now safe. 194 */ 195static void x25_remove_socket(struct sock *sk) 196{ 197 write_lock_bh(&x25_list_lock); 198 sk_del_node_init(sk); 199 write_unlock_bh(&x25_list_lock); 200} 201 202/* 203 * Kill all bound sockets on a dropped device. 204 */ 205static void x25_kill_by_device(struct net_device *dev) 206{ 207 struct sock *s; 208 209 write_lock_bh(&x25_list_lock); 210 211 sk_for_each(s, &x25_list) 212 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev) 213 x25_disconnect(s, ENETUNREACH, 0, 0); 214 215 write_unlock_bh(&x25_list_lock); 216} 217 218/* 219 * Handle device status changes. 220 */ 221static int x25_device_event(struct notifier_block *this, unsigned long event, 222 void *ptr) 223{ 224 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 225 struct x25_neigh *nb; 226 227 if (!net_eq(dev_net(dev), &init_net)) 228 return NOTIFY_DONE; 229 230 if (dev->type == ARPHRD_X25 231#if IS_ENABLED(CONFIG_LLC) 232 || dev->type == ARPHRD_ETHER 233#endif 234 ) { 235 switch (event) { 236 case NETDEV_UP: 237 x25_link_device_up(dev); 238 break; 239 case NETDEV_GOING_DOWN: 240 nb = x25_get_neigh(dev); 241 if (nb) { 242 x25_terminate_link(nb); 243 x25_neigh_put(nb); 244 } 245 break; 246 case NETDEV_DOWN: 247 x25_kill_by_device(dev); 248 x25_route_device_down(dev); 249 x25_link_device_down(dev); 250 break; 251 } 252 } 253 254 return NOTIFY_DONE; 255} 256 257/* 258 * Add a socket to the bound sockets list. 259 */ 260static void x25_insert_socket(struct sock *sk) 261{ 262 write_lock_bh(&x25_list_lock); 263 sk_add_node(sk, &x25_list); 264 write_unlock_bh(&x25_list_lock); 265} 266 267/* 268 * Find a socket that wants to accept the Call Request we just 269 * received. Check the full list for an address/cud match. 270 * If no cuds match return the next_best thing, an address match. 271 * Note: if a listening socket has cud set it must only get calls 272 * with matching cud. 273 */ 274static struct sock *x25_find_listener(struct x25_address *addr, 275 struct sk_buff *skb) 276{ 277 struct sock *s; 278 struct sock *next_best; 279 280 read_lock_bh(&x25_list_lock); 281 next_best = NULL; 282 283 sk_for_each(s, &x25_list) 284 if ((!strcmp(addr->x25_addr, 285 x25_sk(s)->source_addr.x25_addr) || 286 !strcmp(x25_sk(s)->source_addr.x25_addr, 287 null_x25_address.x25_addr)) && 288 s->sk_state == TCP_LISTEN) { 289 /* 290 * Found a listening socket, now check the incoming 291 * call user data vs this sockets call user data 292 */ 293 if (x25_sk(s)->cudmatchlength > 0 && 294 skb->len >= x25_sk(s)->cudmatchlength) { 295 if((memcmp(x25_sk(s)->calluserdata.cuddata, 296 skb->data, 297 x25_sk(s)->cudmatchlength)) == 0) { 298 sock_hold(s); 299 goto found; 300 } 301 } else 302 next_best = s; 303 } 304 if (next_best) { 305 s = next_best; 306 sock_hold(s); 307 goto found; 308 } 309 s = NULL; 310found: 311 read_unlock_bh(&x25_list_lock); 312 return s; 313} 314 315/* 316 * Find a connected X.25 socket given my LCI and neighbour. 317 */ 318static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb) 319{ 320 struct sock *s; 321 322 sk_for_each(s, &x25_list) 323 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) { 324 sock_hold(s); 325 goto found; 326 } 327 s = NULL; 328found: 329 return s; 330} 331 332struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb) 333{ 334 struct sock *s; 335 336 read_lock_bh(&x25_list_lock); 337 s = __x25_find_socket(lci, nb); 338 read_unlock_bh(&x25_list_lock); 339 return s; 340} 341 342/* 343 * Find a unique LCI for a given device. 344 */ 345static unsigned int x25_new_lci(struct x25_neigh *nb) 346{ 347 unsigned int lci = 1; 348 struct sock *sk; 349 350 while ((sk = x25_find_socket(lci, nb)) != NULL) { 351 sock_put(sk); 352 if (++lci == 4096) { 353 lci = 0; 354 break; 355 } 356 cond_resched(); 357 } 358 359 return lci; 360} 361 362/* 363 * Deferred destroy. 364 */ 365static void __x25_destroy_socket(struct sock *); 366 367/* 368 * handler for deferred kills. 369 */ 370static void x25_destroy_timer(struct timer_list *t) 371{ 372 struct sock *sk = from_timer(sk, t, sk_timer); 373 374 x25_destroy_socket_from_timer(sk); 375} 376 377/* 378 * This is called from user mode and the timers. Thus it protects itself 379 * against interrupt users but doesn't worry about being called during 380 * work. Once it is removed from the queue no interrupt or bottom half 381 * will touch it and we are (fairly 8-) ) safe. 382 * Not static as it's used by the timer 383 */ 384static void __x25_destroy_socket(struct sock *sk) 385{ 386 struct sk_buff *skb; 387 388 x25_stop_heartbeat(sk); 389 x25_stop_timer(sk); 390 391 x25_remove_socket(sk); 392 x25_clear_queues(sk); /* Flush the queues */ 393 394 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { 395 if (skb->sk != sk) { /* A pending connection */ 396 /* 397 * Queue the unaccepted socket for death 398 */ 399 skb->sk->sk_state = TCP_LISTEN; 400 sock_set_flag(skb->sk, SOCK_DEAD); 401 x25_start_heartbeat(skb->sk); 402 x25_sk(skb->sk)->state = X25_STATE_0; 403 } 404 405 kfree_skb(skb); 406 } 407 408 if (sk_has_allocations(sk)) { 409 /* Defer: outstanding buffers */ 410 sk->sk_timer.expires = jiffies + 10 * HZ; 411 sk->sk_timer.function = x25_destroy_timer; 412 add_timer(&sk->sk_timer); 413 } else { 414 /* drop last reference so sock_put will free */ 415 __sock_put(sk); 416 } 417} 418 419void x25_destroy_socket_from_timer(struct sock *sk) 420{ 421 sock_hold(sk); 422 bh_lock_sock(sk); 423 __x25_destroy_socket(sk); 424 bh_unlock_sock(sk); 425 sock_put(sk); 426} 427 428/* 429 * Handling for system calls applied via the various interfaces to a 430 * X.25 socket object. 431 */ 432 433static int x25_setsockopt(struct socket *sock, int level, int optname, 434 sockptr_t optval, unsigned int optlen) 435{ 436 int opt; 437 struct sock *sk = sock->sk; 438 int rc = -ENOPROTOOPT; 439 440 if (level != SOL_X25 || optname != X25_QBITINCL) 441 goto out; 442 443 rc = -EINVAL; 444 if (optlen < sizeof(int)) 445 goto out; 446 447 rc = -EFAULT; 448 if (copy_from_sockptr(&opt, optval, sizeof(int))) 449 goto out; 450 451 if (opt) 452 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags); 453 else 454 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags); 455 rc = 0; 456out: 457 return rc; 458} 459 460static int x25_getsockopt(struct socket *sock, int level, int optname, 461 char __user *optval, int __user *optlen) 462{ 463 struct sock *sk = sock->sk; 464 int val, len, rc = -ENOPROTOOPT; 465 466 if (level != SOL_X25 || optname != X25_QBITINCL) 467 goto out; 468 469 rc = -EFAULT; 470 if (get_user(len, optlen)) 471 goto out; 472 473 len = min_t(unsigned int, len, sizeof(int)); 474 475 rc = -EINVAL; 476 if (len < 0) 477 goto out; 478 479 rc = -EFAULT; 480 if (put_user(len, optlen)) 481 goto out; 482 483 val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags); 484 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0; 485out: 486 return rc; 487} 488 489static int x25_listen(struct socket *sock, int backlog) 490{ 491 struct sock *sk = sock->sk; 492 int rc = -EOPNOTSUPP; 493 494 lock_sock(sk); 495 if (sock->state != SS_UNCONNECTED) { 496 rc = -EINVAL; 497 release_sock(sk); 498 return rc; 499 } 500 501 if (sk->sk_state != TCP_LISTEN) { 502 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN); 503 sk->sk_max_ack_backlog = backlog; 504 sk->sk_state = TCP_LISTEN; 505 rc = 0; 506 } 507 release_sock(sk); 508 509 return rc; 510} 511 512static struct proto x25_proto = { 513 .name = "X25", 514 .owner = THIS_MODULE, 515 .obj_size = sizeof(struct x25_sock), 516}; 517 518static struct sock *x25_alloc_socket(struct net *net, int kern) 519{ 520 struct x25_sock *x25; 521 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto, kern); 522 523 if (!sk) 524 goto out; 525 526 sock_init_data(NULL, sk); 527 528 x25 = x25_sk(sk); 529 skb_queue_head_init(&x25->ack_queue); 530 skb_queue_head_init(&x25->fragment_queue); 531 skb_queue_head_init(&x25->interrupt_in_queue); 532 skb_queue_head_init(&x25->interrupt_out_queue); 533out: 534 return sk; 535} 536 537static int x25_create(struct net *net, struct socket *sock, int protocol, 538 int kern) 539{ 540 struct sock *sk; 541 struct x25_sock *x25; 542 int rc = -EAFNOSUPPORT; 543 544 if (!net_eq(net, &init_net)) 545 goto out; 546 547 rc = -ESOCKTNOSUPPORT; 548 if (sock->type != SOCK_SEQPACKET) 549 goto out; 550 551 rc = -EINVAL; 552 if (protocol) 553 goto out; 554 555 rc = -ENOMEM; 556 if ((sk = x25_alloc_socket(net, kern)) == NULL) 557 goto out; 558 559 x25 = x25_sk(sk); 560 561 sock_init_data(sock, sk); 562 563 x25_init_timers(sk); 564 565 sock->ops = &x25_proto_ops; 566 sk->sk_protocol = protocol; 567 sk->sk_backlog_rcv = x25_backlog_rcv; 568 569 x25->t21 = sysctl_x25_call_request_timeout; 570 x25->t22 = sysctl_x25_reset_request_timeout; 571 x25->t23 = sysctl_x25_clear_request_timeout; 572 x25->t2 = sysctl_x25_ack_holdback_timeout; 573 x25->state = X25_STATE_0; 574 x25->cudmatchlength = 0; 575 set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); /* normally no cud */ 576 /* on call accept */ 577 578 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE; 579 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE; 580 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE; 581 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE; 582 x25->facilities.throughput = 0; /* by default don't negotiate 583 throughput */ 584 x25->facilities.reverse = X25_DEFAULT_REVERSE; 585 x25->dte_facilities.calling_len = 0; 586 x25->dte_facilities.called_len = 0; 587 memset(x25->dte_facilities.called_ae, '\0', 588 sizeof(x25->dte_facilities.called_ae)); 589 memset(x25->dte_facilities.calling_ae, '\0', 590 sizeof(x25->dte_facilities.calling_ae)); 591 592 rc = 0; 593out: 594 return rc; 595} 596 597static struct sock *x25_make_new(struct sock *osk) 598{ 599 struct sock *sk = NULL; 600 struct x25_sock *x25, *ox25; 601 602 if (osk->sk_type != SOCK_SEQPACKET) 603 goto out; 604 605 if ((sk = x25_alloc_socket(sock_net(osk), 0)) == NULL) 606 goto out; 607 608 x25 = x25_sk(sk); 609 610 sk->sk_type = osk->sk_type; 611 sk->sk_priority = osk->sk_priority; 612 sk->sk_protocol = osk->sk_protocol; 613 sk->sk_rcvbuf = osk->sk_rcvbuf; 614 sk->sk_sndbuf = osk->sk_sndbuf; 615 sk->sk_state = TCP_ESTABLISHED; 616 sk->sk_backlog_rcv = osk->sk_backlog_rcv; 617 sock_copy_flags(sk, osk); 618 619 ox25 = x25_sk(osk); 620 x25->t21 = ox25->t21; 621 x25->t22 = ox25->t22; 622 x25->t23 = ox25->t23; 623 x25->t2 = ox25->t2; 624 x25->flags = ox25->flags; 625 x25->facilities = ox25->facilities; 626 x25->dte_facilities = ox25->dte_facilities; 627 x25->cudmatchlength = ox25->cudmatchlength; 628 629 clear_bit(X25_INTERRUPT_FLAG, &x25->flags); 630 x25_init_timers(sk); 631out: 632 return sk; 633} 634 635static int x25_release(struct socket *sock) 636{ 637 struct sock *sk = sock->sk; 638 struct x25_sock *x25; 639 640 if (!sk) 641 return 0; 642 643 x25 = x25_sk(sk); 644 645 sock_hold(sk); 646 lock_sock(sk); 647 switch (x25->state) { 648 649 case X25_STATE_0: 650 case X25_STATE_2: 651 x25_disconnect(sk, 0, 0, 0); 652 __x25_destroy_socket(sk); 653 goto out; 654 655 case X25_STATE_1: 656 case X25_STATE_3: 657 case X25_STATE_4: 658 x25_clear_queues(sk); 659 x25_write_internal(sk, X25_CLEAR_REQUEST); 660 x25_start_t23timer(sk); 661 x25->state = X25_STATE_2; 662 sk->sk_state = TCP_CLOSE; 663 sk->sk_shutdown |= SEND_SHUTDOWN; 664 sk->sk_state_change(sk); 665 sock_set_flag(sk, SOCK_DEAD); 666 sock_set_flag(sk, SOCK_DESTROY); 667 break; 668 669 case X25_STATE_5: 670 x25_write_internal(sk, X25_CLEAR_REQUEST); 671 x25_disconnect(sk, 0, 0, 0); 672 __x25_destroy_socket(sk); 673 goto out; 674 } 675 676 sock_orphan(sk); 677out: 678 release_sock(sk); 679 sock_put(sk); 680 return 0; 681} 682 683static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 684{ 685 struct sock *sk = sock->sk; 686 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr; 687 int len, i, rc = 0; 688 689 if (addr_len != sizeof(struct sockaddr_x25) || 690 addr->sx25_family != AF_X25 || 691 strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN) { 692 rc = -EINVAL; 693 goto out; 694 } 695 696 /* check for the null_x25_address */ 697 if (strcmp(addr->sx25_addr.x25_addr, null_x25_address.x25_addr)) { 698 699 len = strlen(addr->sx25_addr.x25_addr); 700 for (i = 0; i < len; i++) { 701 if (!isdigit(addr->sx25_addr.x25_addr[i])) { 702 rc = -EINVAL; 703 goto out; 704 } 705 } 706 } 707 708 lock_sock(sk); 709 if (sock_flag(sk, SOCK_ZAPPED)) { 710 x25_sk(sk)->source_addr = addr->sx25_addr; 711 x25_insert_socket(sk); 712 sock_reset_flag(sk, SOCK_ZAPPED); 713 } else { 714 rc = -EINVAL; 715 } 716 release_sock(sk); 717 SOCK_DEBUG(sk, "x25_bind: socket is bound\n"); 718out: 719 return rc; 720} 721 722static int x25_wait_for_connection_establishment(struct sock *sk) 723{ 724 DECLARE_WAITQUEUE(wait, current); 725 int rc; 726 727 add_wait_queue_exclusive(sk_sleep(sk), &wait); 728 for (;;) { 729 __set_current_state(TASK_INTERRUPTIBLE); 730 rc = -ERESTARTSYS; 731 if (signal_pending(current)) 732 break; 733 rc = sock_error(sk); 734 if (rc) { 735 sk->sk_socket->state = SS_UNCONNECTED; 736 break; 737 } 738 rc = 0; 739 if (sk->sk_state != TCP_ESTABLISHED) { 740 release_sock(sk); 741 schedule(); 742 lock_sock(sk); 743 } else 744 break; 745 } 746 __set_current_state(TASK_RUNNING); 747 remove_wait_queue(sk_sleep(sk), &wait); 748 return rc; 749} 750 751static int x25_connect(struct socket *sock, struct sockaddr *uaddr, 752 int addr_len, int flags) 753{ 754 struct sock *sk = sock->sk; 755 struct x25_sock *x25 = x25_sk(sk); 756 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr; 757 struct x25_route *rt; 758 int rc = 0; 759 760 lock_sock(sk); 761 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) { 762 sock->state = SS_CONNECTED; 763 goto out; /* Connect completed during a ERESTARTSYS event */ 764 } 765 766 rc = -ECONNREFUSED; 767 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) { 768 sock->state = SS_UNCONNECTED; 769 goto out; 770 } 771 772 rc = -EISCONN; /* No reconnect on a seqpacket socket */ 773 if (sk->sk_state == TCP_ESTABLISHED) 774 goto out; 775 776 rc = -EALREADY; /* Do nothing if call is already in progress */ 777 if (sk->sk_state == TCP_SYN_SENT) 778 goto out; 779 780 sk->sk_state = TCP_CLOSE; 781 sock->state = SS_UNCONNECTED; 782 783 rc = -EINVAL; 784 if (addr_len != sizeof(struct sockaddr_x25) || 785 addr->sx25_family != AF_X25 || 786 strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN) 787 goto out; 788 789 rc = -ENETUNREACH; 790 rt = x25_get_route(&addr->sx25_addr); 791 if (!rt) 792 goto out; 793 794 x25->neighbour = x25_get_neigh(rt->dev); 795 if (!x25->neighbour) 796 goto out_put_route; 797 798 x25_limit_facilities(&x25->facilities, x25->neighbour); 799 800 x25->lci = x25_new_lci(x25->neighbour); 801 if (!x25->lci) 802 goto out_put_neigh; 803 804 rc = -EINVAL; 805 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */ 806 goto out_put_neigh; 807 808 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr)) 809 memset(&x25->source_addr, '\0', X25_ADDR_LEN); 810 811 x25->dest_addr = addr->sx25_addr; 812 813 /* Move to connecting socket, start sending Connect Requests */ 814 sock->state = SS_CONNECTING; 815 sk->sk_state = TCP_SYN_SENT; 816 817 x25->state = X25_STATE_1; 818 819 x25_write_internal(sk, X25_CALL_REQUEST); 820 821 x25_start_heartbeat(sk); 822 x25_start_t21timer(sk); 823 824 /* Now the loop */ 825 rc = -EINPROGRESS; 826 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) 827 goto out; 828 829 rc = x25_wait_for_connection_establishment(sk); 830 if (rc) 831 goto out_put_neigh; 832 833 sock->state = SS_CONNECTED; 834 rc = 0; 835out_put_neigh: 836 if (rc && x25->neighbour) { 837 read_lock_bh(&x25_list_lock); 838 x25_neigh_put(x25->neighbour); 839 x25->neighbour = NULL; 840 read_unlock_bh(&x25_list_lock); 841 x25->state = X25_STATE_0; 842 } 843out_put_route: 844 x25_route_put(rt); 845out: 846 release_sock(sk); 847 return rc; 848} 849 850static int x25_wait_for_data(struct sock *sk, long timeout) 851{ 852 DECLARE_WAITQUEUE(wait, current); 853 int rc = 0; 854 855 add_wait_queue_exclusive(sk_sleep(sk), &wait); 856 for (;;) { 857 __set_current_state(TASK_INTERRUPTIBLE); 858 if (sk->sk_shutdown & RCV_SHUTDOWN) 859 break; 860 rc = -ERESTARTSYS; 861 if (signal_pending(current)) 862 break; 863 rc = -EAGAIN; 864 if (!timeout) 865 break; 866 rc = 0; 867 if (skb_queue_empty(&sk->sk_receive_queue)) { 868 release_sock(sk); 869 timeout = schedule_timeout(timeout); 870 lock_sock(sk); 871 } else 872 break; 873 } 874 __set_current_state(TASK_RUNNING); 875 remove_wait_queue(sk_sleep(sk), &wait); 876 return rc; 877} 878 879static int x25_accept(struct socket *sock, struct socket *newsock, int flags, 880 bool kern) 881{ 882 struct sock *sk = sock->sk; 883 struct sock *newsk; 884 struct sk_buff *skb; 885 int rc = -EINVAL; 886 887 if (!sk) 888 goto out; 889 890 rc = -EOPNOTSUPP; 891 if (sk->sk_type != SOCK_SEQPACKET) 892 goto out; 893 894 lock_sock(sk); 895 rc = -EINVAL; 896 if (sk->sk_state != TCP_LISTEN) 897 goto out2; 898 899 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo); 900 if (rc) 901 goto out2; 902 skb = skb_dequeue(&sk->sk_receive_queue); 903 rc = -EINVAL; 904 if (!skb->sk) 905 goto out2; 906 newsk = skb->sk; 907 sock_graft(newsk, newsock); 908 909 /* Now attach up the new socket */ 910 skb->sk = NULL; 911 kfree_skb(skb); 912 sk_acceptq_removed(sk); 913 newsock->state = SS_CONNECTED; 914 rc = 0; 915out2: 916 release_sock(sk); 917out: 918 return rc; 919} 920 921static int x25_getname(struct socket *sock, struct sockaddr *uaddr, 922 int peer) 923{ 924 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr; 925 struct sock *sk = sock->sk; 926 struct x25_sock *x25 = x25_sk(sk); 927 int rc = 0; 928 929 if (peer) { 930 if (sk->sk_state != TCP_ESTABLISHED) { 931 rc = -ENOTCONN; 932 goto out; 933 } 934 sx25->sx25_addr = x25->dest_addr; 935 } else 936 sx25->sx25_addr = x25->source_addr; 937 938 sx25->sx25_family = AF_X25; 939 rc = sizeof(*sx25); 940 941out: 942 return rc; 943} 944 945int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb, 946 unsigned int lci) 947{ 948 struct sock *sk; 949 struct sock *make; 950 struct x25_sock *makex25; 951 struct x25_address source_addr, dest_addr; 952 struct x25_facilities facilities; 953 struct x25_dte_facilities dte_facilities; 954 int len, addr_len, rc; 955 956 /* 957 * Remove the LCI and frame type. 958 */ 959 skb_pull(skb, X25_STD_MIN_LEN); 960 961 /* 962 * Extract the X.25 addresses and convert them to ASCII strings, 963 * and remove them. 964 * 965 * Address block is mandatory in call request packets 966 */ 967 addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr); 968 if (addr_len <= 0) 969 goto out_clear_request; 970 skb_pull(skb, addr_len); 971 972 /* 973 * Get the length of the facilities, skip past them for the moment 974 * get the call user data because this is needed to determine 975 * the correct listener 976 * 977 * Facilities length is mandatory in call request packets 978 */ 979 if (!pskb_may_pull(skb, 1)) 980 goto out_clear_request; 981 len = skb->data[0] + 1; 982 if (!pskb_may_pull(skb, len)) 983 goto out_clear_request; 984 skb_pull(skb,len); 985 986 /* 987 * Ensure that the amount of call user data is valid. 988 */ 989 if (skb->len > X25_MAX_CUD_LEN) 990 goto out_clear_request; 991 992 /* 993 * Get all the call user data so it can be used in 994 * x25_find_listener and skb_copy_from_linear_data up ahead. 995 */ 996 if (!pskb_may_pull(skb, skb->len)) 997 goto out_clear_request; 998 999 /* 1000 * Find a listener for the particular address/cud pair. 1001 */ 1002 sk = x25_find_listener(&source_addr,skb); 1003 skb_push(skb,len); 1004 1005 if (sk != NULL && sk_acceptq_is_full(sk)) { 1006 goto out_sock_put; 1007 } 1008 1009 /* 1010 * We dont have any listeners for this incoming call. 1011 * Try forwarding it. 1012 */ 1013 if (sk == NULL) { 1014 skb_push(skb, addr_len + X25_STD_MIN_LEN); 1015 if (sysctl_x25_forward && 1016 x25_forward_call(&dest_addr, nb, skb, lci) > 0) 1017 { 1018 /* Call was forwarded, dont process it any more */ 1019 kfree_skb(skb); 1020 rc = 1; 1021 goto out; 1022 } else { 1023 /* No listeners, can't forward, clear the call */ 1024 goto out_clear_request; 1025 } 1026 } 1027 1028 /* 1029 * Try to reach a compromise on the requested facilities. 1030 */ 1031 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities); 1032 if (len == -1) 1033 goto out_sock_put; 1034 1035 /* 1036 * current neighbour/link might impose additional limits 1037 * on certain facilties 1038 */ 1039 1040 x25_limit_facilities(&facilities, nb); 1041 1042 /* 1043 * Try to create a new socket. 1044 */ 1045 make = x25_make_new(sk); 1046 if (!make) 1047 goto out_sock_put; 1048 1049 /* 1050 * Remove the facilities 1051 */ 1052 skb_pull(skb, len); 1053 1054 skb->sk = make; 1055 make->sk_state = TCP_ESTABLISHED; 1056 1057 makex25 = x25_sk(make); 1058 makex25->lci = lci; 1059 makex25->dest_addr = dest_addr; 1060 makex25->source_addr = source_addr; 1061 x25_neigh_hold(nb); 1062 makex25->neighbour = nb; 1063 makex25->facilities = facilities; 1064 makex25->dte_facilities= dte_facilities; 1065 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask; 1066 /* ensure no reverse facil on accept */ 1067 makex25->vc_facil_mask &= ~X25_MASK_REVERSE; 1068 /* ensure no calling address extension on accept */ 1069 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE; 1070 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength; 1071 1072 /* Normally all calls are accepted immediately */ 1073 if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) { 1074 x25_write_internal(make, X25_CALL_ACCEPTED); 1075 makex25->state = X25_STATE_3; 1076 } else { 1077 makex25->state = X25_STATE_5; 1078 } 1079 1080 /* 1081 * Incoming Call User Data. 1082 */ 1083 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len); 1084 makex25->calluserdata.cudlength = skb->len; 1085 1086 sk_acceptq_added(sk); 1087 1088 x25_insert_socket(make); 1089 1090 skb_queue_head(&sk->sk_receive_queue, skb); 1091 1092 x25_start_heartbeat(make); 1093 1094 if (!sock_flag(sk, SOCK_DEAD)) 1095 sk->sk_data_ready(sk); 1096 rc = 1; 1097 sock_put(sk); 1098out: 1099 return rc; 1100out_sock_put: 1101 sock_put(sk); 1102out_clear_request: 1103 rc = 0; 1104 x25_transmit_clear_request(nb, lci, 0x01); 1105 goto out; 1106} 1107 1108static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) 1109{ 1110 struct sock *sk = sock->sk; 1111 struct x25_sock *x25 = x25_sk(sk); 1112 DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name); 1113 struct sockaddr_x25 sx25; 1114 struct sk_buff *skb; 1115 unsigned char *asmptr; 1116 int noblock = msg->msg_flags & MSG_DONTWAIT; 1117 size_t size; 1118 int qbit = 0, rc = -EINVAL; 1119 1120 lock_sock(sk); 1121 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT)) 1122 goto out; 1123 1124 /* we currently don't support segmented records at the user interface */ 1125 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB))) 1126 goto out; 1127 1128 rc = -EADDRNOTAVAIL; 1129 if (sock_flag(sk, SOCK_ZAPPED)) 1130 goto out; 1131 1132 rc = -EPIPE; 1133 if (sk->sk_shutdown & SEND_SHUTDOWN) { 1134 send_sig(SIGPIPE, current, 0); 1135 goto out; 1136 } 1137 1138 rc = -ENETUNREACH; 1139 if (!x25->neighbour) 1140 goto out; 1141 1142 if (usx25) { 1143 rc = -EINVAL; 1144 if (msg->msg_namelen < sizeof(sx25)) 1145 goto out; 1146 memcpy(&sx25, usx25, sizeof(sx25)); 1147 rc = -EISCONN; 1148 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr)) 1149 goto out; 1150 rc = -EINVAL; 1151 if (sx25.sx25_family != AF_X25) 1152 goto out; 1153 } else { 1154 /* 1155 * FIXME 1003.1g - if the socket is like this because 1156 * it has become closed (not started closed) we ought 1157 * to SIGPIPE, EPIPE; 1158 */ 1159 rc = -ENOTCONN; 1160 if (sk->sk_state != TCP_ESTABLISHED) 1161 goto out; 1162 1163 sx25.sx25_family = AF_X25; 1164 sx25.sx25_addr = x25->dest_addr; 1165 } 1166 1167 /* Sanity check the packet size */ 1168 if (len > 65535) { 1169 rc = -EMSGSIZE; 1170 goto out; 1171 } 1172 1173 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n"); 1174 1175 /* Build a packet */ 1176 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n"); 1177 1178 if ((msg->msg_flags & MSG_OOB) && len > 32) 1179 len = 32; 1180 1181 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN; 1182 1183 release_sock(sk); 1184 skb = sock_alloc_send_skb(sk, size, noblock, &rc); 1185 lock_sock(sk); 1186 if (!skb) 1187 goto out; 1188 X25_SKB_CB(skb)->flags = msg->msg_flags; 1189 1190 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN); 1191 1192 /* 1193 * Put the data on the end 1194 */ 1195 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n"); 1196 1197 skb_reset_transport_header(skb); 1198 skb_put(skb, len); 1199 1200 rc = memcpy_from_msg(skb_transport_header(skb), msg, len); 1201 if (rc) 1202 goto out_kfree_skb; 1203 1204 /* 1205 * If the Q BIT Include socket option is in force, the first 1206 * byte of the user data is the logical value of the Q Bit. 1207 */ 1208 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { 1209 if (!pskb_may_pull(skb, 1)) 1210 goto out_kfree_skb; 1211 1212 qbit = skb->data[0]; 1213 skb_pull(skb, 1); 1214 } 1215 1216 /* 1217 * Push down the X.25 header 1218 */ 1219 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n"); 1220 1221 if (msg->msg_flags & MSG_OOB) { 1222 if (x25->neighbour->extended) { 1223 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1224 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ; 1225 *asmptr++ = (x25->lci >> 0) & 0xFF; 1226 *asmptr++ = X25_INTERRUPT; 1227 } else { 1228 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1229 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ; 1230 *asmptr++ = (x25->lci >> 0) & 0xFF; 1231 *asmptr++ = X25_INTERRUPT; 1232 } 1233 } else { 1234 if (x25->neighbour->extended) { 1235 /* Build an Extended X.25 header */ 1236 asmptr = skb_push(skb, X25_EXT_MIN_LEN); 1237 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ; 1238 *asmptr++ = (x25->lci >> 0) & 0xFF; 1239 *asmptr++ = X25_DATA; 1240 *asmptr++ = X25_DATA; 1241 } else { 1242 /* Build an Standard X.25 header */ 1243 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1244 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ; 1245 *asmptr++ = (x25->lci >> 0) & 0xFF; 1246 *asmptr++ = X25_DATA; 1247 } 1248 1249 if (qbit) 1250 skb->data[0] |= X25_Q_BIT; 1251 } 1252 1253 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n"); 1254 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n"); 1255 1256 rc = -ENOTCONN; 1257 if (sk->sk_state != TCP_ESTABLISHED) 1258 goto out_kfree_skb; 1259 1260 if (msg->msg_flags & MSG_OOB) 1261 skb_queue_tail(&x25->interrupt_out_queue, skb); 1262 else { 1263 rc = x25_output(sk, skb); 1264 len = rc; 1265 if (rc < 0) 1266 kfree_skb(skb); 1267 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) 1268 len++; 1269 } 1270 1271 x25_kick(sk); 1272 rc = len; 1273out: 1274 release_sock(sk); 1275 return rc; 1276out_kfree_skb: 1277 kfree_skb(skb); 1278 goto out; 1279} 1280 1281 1282static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 1283 int flags) 1284{ 1285 struct sock *sk = sock->sk; 1286 struct x25_sock *x25 = x25_sk(sk); 1287 DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name); 1288 size_t copied; 1289 int qbit, header_len; 1290 struct sk_buff *skb; 1291 unsigned char *asmptr; 1292 int rc = -ENOTCONN; 1293 1294 lock_sock(sk); 1295 1296 if (x25->neighbour == NULL) 1297 goto out; 1298 1299 header_len = x25->neighbour->extended ? 1300 X25_EXT_MIN_LEN : X25_STD_MIN_LEN; 1301 1302 /* 1303 * This works for seqpacket too. The receiver has ordered the queue for 1304 * us! We do one quick check first though 1305 */ 1306 if (sk->sk_state != TCP_ESTABLISHED) 1307 goto out; 1308 1309 if (flags & MSG_OOB) { 1310 rc = -EINVAL; 1311 if (sock_flag(sk, SOCK_URGINLINE) || 1312 !skb_peek(&x25->interrupt_in_queue)) 1313 goto out; 1314 1315 skb = skb_dequeue(&x25->interrupt_in_queue); 1316 1317 if (!pskb_may_pull(skb, X25_STD_MIN_LEN)) 1318 goto out_free_dgram; 1319 1320 skb_pull(skb, X25_STD_MIN_LEN); 1321 1322 /* 1323 * No Q bit information on Interrupt data. 1324 */ 1325 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { 1326 asmptr = skb_push(skb, 1); 1327 *asmptr = 0x00; 1328 } 1329 1330 msg->msg_flags |= MSG_OOB; 1331 } else { 1332 /* Now we can treat all alike */ 1333 release_sock(sk); 1334 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, 1335 flags & MSG_DONTWAIT, &rc); 1336 lock_sock(sk); 1337 if (!skb) 1338 goto out; 1339 1340 if (!pskb_may_pull(skb, header_len)) 1341 goto out_free_dgram; 1342 1343 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT; 1344 1345 skb_pull(skb, header_len); 1346 1347 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { 1348 asmptr = skb_push(skb, 1); 1349 *asmptr = qbit; 1350 } 1351 } 1352 1353 skb_reset_transport_header(skb); 1354 copied = skb->len; 1355 1356 if (copied > size) { 1357 copied = size; 1358 msg->msg_flags |= MSG_TRUNC; 1359 } 1360 1361 /* Currently, each datagram always contains a complete record */ 1362 msg->msg_flags |= MSG_EOR; 1363 1364 rc = skb_copy_datagram_msg(skb, 0, msg, copied); 1365 if (rc) 1366 goto out_free_dgram; 1367 1368 if (sx25) { 1369 sx25->sx25_family = AF_X25; 1370 sx25->sx25_addr = x25->dest_addr; 1371 msg->msg_namelen = sizeof(*sx25); 1372 } 1373 1374 x25_check_rbuf(sk); 1375 rc = copied; 1376out_free_dgram: 1377 skb_free_datagram(sk, skb); 1378out: 1379 release_sock(sk); 1380 return rc; 1381} 1382 1383 1384static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1385{ 1386 struct sock *sk = sock->sk; 1387 struct x25_sock *x25 = x25_sk(sk); 1388 void __user *argp = (void __user *)arg; 1389 int rc; 1390 1391 switch (cmd) { 1392 case TIOCOUTQ: { 1393 int amount; 1394 1395 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk); 1396 if (amount < 0) 1397 amount = 0; 1398 rc = put_user(amount, (unsigned int __user *)argp); 1399 break; 1400 } 1401 1402 case TIOCINQ: { 1403 struct sk_buff *skb; 1404 int amount = 0; 1405 /* 1406 * These two are safe on a single CPU system as 1407 * only user tasks fiddle here 1408 */ 1409 lock_sock(sk); 1410 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) 1411 amount = skb->len; 1412 release_sock(sk); 1413 rc = put_user(amount, (unsigned int __user *)argp); 1414 break; 1415 } 1416 1417 case SIOCGIFADDR: 1418 case SIOCSIFADDR: 1419 case SIOCGIFDSTADDR: 1420 case SIOCSIFDSTADDR: 1421 case SIOCGIFBRDADDR: 1422 case SIOCSIFBRDADDR: 1423 case SIOCGIFNETMASK: 1424 case SIOCSIFNETMASK: 1425 case SIOCGIFMETRIC: 1426 case SIOCSIFMETRIC: 1427 rc = -EINVAL; 1428 break; 1429 case SIOCADDRT: 1430 case SIOCDELRT: 1431 rc = -EPERM; 1432 if (!capable(CAP_NET_ADMIN)) 1433 break; 1434 rc = x25_route_ioctl(cmd, argp); 1435 break; 1436 case SIOCX25GSUBSCRIP: 1437 rc = x25_subscr_ioctl(cmd, argp); 1438 break; 1439 case SIOCX25SSUBSCRIP: 1440 rc = -EPERM; 1441 if (!capable(CAP_NET_ADMIN)) 1442 break; 1443 rc = x25_subscr_ioctl(cmd, argp); 1444 break; 1445 case SIOCX25GFACILITIES: { 1446 lock_sock(sk); 1447 rc = copy_to_user(argp, &x25->facilities, 1448 sizeof(x25->facilities)) 1449 ? -EFAULT : 0; 1450 release_sock(sk); 1451 break; 1452 } 1453 1454 case SIOCX25SFACILITIES: { 1455 struct x25_facilities facilities; 1456 rc = -EFAULT; 1457 if (copy_from_user(&facilities, argp, sizeof(facilities))) 1458 break; 1459 rc = -EINVAL; 1460 lock_sock(sk); 1461 if (sk->sk_state != TCP_LISTEN && 1462 sk->sk_state != TCP_CLOSE) 1463 goto out_fac_release; 1464 if (facilities.pacsize_in < X25_PS16 || 1465 facilities.pacsize_in > X25_PS4096) 1466 goto out_fac_release; 1467 if (facilities.pacsize_out < X25_PS16 || 1468 facilities.pacsize_out > X25_PS4096) 1469 goto out_fac_release; 1470 if (facilities.winsize_in < 1 || 1471 facilities.winsize_in > 127) 1472 goto out_fac_release; 1473 if (facilities.throughput) { 1474 int out = facilities.throughput & 0xf0; 1475 int in = facilities.throughput & 0x0f; 1476 if (!out) 1477 facilities.throughput |= 1478 X25_DEFAULT_THROUGHPUT << 4; 1479 else if (out < 0x30 || out > 0xD0) 1480 goto out_fac_release; 1481 if (!in) 1482 facilities.throughput |= 1483 X25_DEFAULT_THROUGHPUT; 1484 else if (in < 0x03 || in > 0x0D) 1485 goto out_fac_release; 1486 } 1487 if (facilities.reverse && 1488 (facilities.reverse & 0x81) != 0x81) 1489 goto out_fac_release; 1490 x25->facilities = facilities; 1491 rc = 0; 1492out_fac_release: 1493 release_sock(sk); 1494 break; 1495 } 1496 1497 case SIOCX25GDTEFACILITIES: { 1498 lock_sock(sk); 1499 rc = copy_to_user(argp, &x25->dte_facilities, 1500 sizeof(x25->dte_facilities)); 1501 release_sock(sk); 1502 if (rc) 1503 rc = -EFAULT; 1504 break; 1505 } 1506 1507 case SIOCX25SDTEFACILITIES: { 1508 struct x25_dte_facilities dtefacs; 1509 rc = -EFAULT; 1510 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs))) 1511 break; 1512 rc = -EINVAL; 1513 lock_sock(sk); 1514 if (sk->sk_state != TCP_LISTEN && 1515 sk->sk_state != TCP_CLOSE) 1516 goto out_dtefac_release; 1517 if (dtefacs.calling_len > X25_MAX_AE_LEN) 1518 goto out_dtefac_release; 1519 if (dtefacs.called_len > X25_MAX_AE_LEN) 1520 goto out_dtefac_release; 1521 x25->dte_facilities = dtefacs; 1522 rc = 0; 1523out_dtefac_release: 1524 release_sock(sk); 1525 break; 1526 } 1527 1528 case SIOCX25GCALLUSERDATA: { 1529 lock_sock(sk); 1530 rc = copy_to_user(argp, &x25->calluserdata, 1531 sizeof(x25->calluserdata)) 1532 ? -EFAULT : 0; 1533 release_sock(sk); 1534 break; 1535 } 1536 1537 case SIOCX25SCALLUSERDATA: { 1538 struct x25_calluserdata calluserdata; 1539 1540 rc = -EFAULT; 1541 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata))) 1542 break; 1543 rc = -EINVAL; 1544 if (calluserdata.cudlength > X25_MAX_CUD_LEN) 1545 break; 1546 lock_sock(sk); 1547 x25->calluserdata = calluserdata; 1548 release_sock(sk); 1549 rc = 0; 1550 break; 1551 } 1552 1553 case SIOCX25GCAUSEDIAG: { 1554 lock_sock(sk); 1555 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag)) 1556 ? -EFAULT : 0; 1557 release_sock(sk); 1558 break; 1559 } 1560 1561 case SIOCX25SCAUSEDIAG: { 1562 struct x25_causediag causediag; 1563 rc = -EFAULT; 1564 if (copy_from_user(&causediag, argp, sizeof(causediag))) 1565 break; 1566 lock_sock(sk); 1567 x25->causediag = causediag; 1568 release_sock(sk); 1569 rc = 0; 1570 break; 1571 1572 } 1573 1574 case SIOCX25SCUDMATCHLEN: { 1575 struct x25_subaddr sub_addr; 1576 rc = -EINVAL; 1577 lock_sock(sk); 1578 if(sk->sk_state != TCP_CLOSE) 1579 goto out_cud_release; 1580 rc = -EFAULT; 1581 if (copy_from_user(&sub_addr, argp, 1582 sizeof(sub_addr))) 1583 goto out_cud_release; 1584 rc = -EINVAL; 1585 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN) 1586 goto out_cud_release; 1587 x25->cudmatchlength = sub_addr.cudmatchlength; 1588 rc = 0; 1589out_cud_release: 1590 release_sock(sk); 1591 break; 1592 } 1593 1594 case SIOCX25CALLACCPTAPPRV: { 1595 rc = -EINVAL; 1596 lock_sock(sk); 1597 if (sk->sk_state == TCP_CLOSE) { 1598 clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); 1599 rc = 0; 1600 } 1601 release_sock(sk); 1602 break; 1603 } 1604 1605 case SIOCX25SENDCALLACCPT: { 1606 rc = -EINVAL; 1607 lock_sock(sk); 1608 if (sk->sk_state != TCP_ESTABLISHED) 1609 goto out_sendcallaccpt_release; 1610 /* must call accptapprv above */ 1611 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags)) 1612 goto out_sendcallaccpt_release; 1613 x25_write_internal(sk, X25_CALL_ACCEPTED); 1614 x25->state = X25_STATE_3; 1615 rc = 0; 1616out_sendcallaccpt_release: 1617 release_sock(sk); 1618 break; 1619 } 1620 1621 default: 1622 rc = -ENOIOCTLCMD; 1623 break; 1624 } 1625 1626 return rc; 1627} 1628 1629static const struct net_proto_family x25_family_ops = { 1630 .family = AF_X25, 1631 .create = x25_create, 1632 .owner = THIS_MODULE, 1633}; 1634 1635#ifdef CONFIG_COMPAT 1636static int compat_x25_subscr_ioctl(unsigned int cmd, 1637 struct compat_x25_subscrip_struct __user *x25_subscr32) 1638{ 1639 struct compat_x25_subscrip_struct x25_subscr; 1640 struct x25_neigh *nb; 1641 struct net_device *dev; 1642 int rc = -EINVAL; 1643 1644 rc = -EFAULT; 1645 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32))) 1646 goto out; 1647 1648 rc = -EINVAL; 1649 dev = x25_dev_get(x25_subscr.device); 1650 if (dev == NULL) 1651 goto out; 1652 1653 nb = x25_get_neigh(dev); 1654 if (nb == NULL) 1655 goto out_dev_put; 1656 1657 dev_put(dev); 1658 1659 if (cmd == SIOCX25GSUBSCRIP) { 1660 read_lock_bh(&x25_neigh_list_lock); 1661 x25_subscr.extended = nb->extended; 1662 x25_subscr.global_facil_mask = nb->global_facil_mask; 1663 read_unlock_bh(&x25_neigh_list_lock); 1664 rc = copy_to_user(x25_subscr32, &x25_subscr, 1665 sizeof(*x25_subscr32)) ? -EFAULT : 0; 1666 } else { 1667 rc = -EINVAL; 1668 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) { 1669 rc = 0; 1670 write_lock_bh(&x25_neigh_list_lock); 1671 nb->extended = x25_subscr.extended; 1672 nb->global_facil_mask = x25_subscr.global_facil_mask; 1673 write_unlock_bh(&x25_neigh_list_lock); 1674 } 1675 } 1676 x25_neigh_put(nb); 1677out: 1678 return rc; 1679out_dev_put: 1680 dev_put(dev); 1681 goto out; 1682} 1683 1684static int compat_x25_ioctl(struct socket *sock, unsigned int cmd, 1685 unsigned long arg) 1686{ 1687 void __user *argp = compat_ptr(arg); 1688 int rc = -ENOIOCTLCMD; 1689 1690 switch(cmd) { 1691 case TIOCOUTQ: 1692 case TIOCINQ: 1693 rc = x25_ioctl(sock, cmd, (unsigned long)argp); 1694 break; 1695 case SIOCGIFADDR: 1696 case SIOCSIFADDR: 1697 case SIOCGIFDSTADDR: 1698 case SIOCSIFDSTADDR: 1699 case SIOCGIFBRDADDR: 1700 case SIOCSIFBRDADDR: 1701 case SIOCGIFNETMASK: 1702 case SIOCSIFNETMASK: 1703 case SIOCGIFMETRIC: 1704 case SIOCSIFMETRIC: 1705 rc = -EINVAL; 1706 break; 1707 case SIOCADDRT: 1708 case SIOCDELRT: 1709 rc = -EPERM; 1710 if (!capable(CAP_NET_ADMIN)) 1711 break; 1712 rc = x25_route_ioctl(cmd, argp); 1713 break; 1714 case SIOCX25GSUBSCRIP: 1715 rc = compat_x25_subscr_ioctl(cmd, argp); 1716 break; 1717 case SIOCX25SSUBSCRIP: 1718 rc = -EPERM; 1719 if (!capable(CAP_NET_ADMIN)) 1720 break; 1721 rc = compat_x25_subscr_ioctl(cmd, argp); 1722 break; 1723 case SIOCX25GFACILITIES: 1724 case SIOCX25SFACILITIES: 1725 case SIOCX25GDTEFACILITIES: 1726 case SIOCX25SDTEFACILITIES: 1727 case SIOCX25GCALLUSERDATA: 1728 case SIOCX25SCALLUSERDATA: 1729 case SIOCX25GCAUSEDIAG: 1730 case SIOCX25SCAUSEDIAG: 1731 case SIOCX25SCUDMATCHLEN: 1732 case SIOCX25CALLACCPTAPPRV: 1733 case SIOCX25SENDCALLACCPT: 1734 rc = x25_ioctl(sock, cmd, (unsigned long)argp); 1735 break; 1736 default: 1737 rc = -ENOIOCTLCMD; 1738 break; 1739 } 1740 return rc; 1741} 1742#endif 1743 1744static const struct proto_ops x25_proto_ops = { 1745 .family = AF_X25, 1746 .owner = THIS_MODULE, 1747 .release = x25_release, 1748 .bind = x25_bind, 1749 .connect = x25_connect, 1750 .socketpair = sock_no_socketpair, 1751 .accept = x25_accept, 1752 .getname = x25_getname, 1753 .poll = datagram_poll, 1754 .ioctl = x25_ioctl, 1755#ifdef CONFIG_COMPAT 1756 .compat_ioctl = compat_x25_ioctl, 1757#endif 1758 .gettstamp = sock_gettstamp, 1759 .listen = x25_listen, 1760 .shutdown = sock_no_shutdown, 1761 .setsockopt = x25_setsockopt, 1762 .getsockopt = x25_getsockopt, 1763 .sendmsg = x25_sendmsg, 1764 .recvmsg = x25_recvmsg, 1765 .mmap = sock_no_mmap, 1766 .sendpage = sock_no_sendpage, 1767}; 1768 1769static struct packet_type x25_packet_type __read_mostly = { 1770 .type = cpu_to_be16(ETH_P_X25), 1771 .func = x25_lapb_receive_frame, 1772}; 1773 1774static struct notifier_block x25_dev_notifier = { 1775 .notifier_call = x25_device_event, 1776}; 1777 1778void x25_kill_by_neigh(struct x25_neigh *nb) 1779{ 1780 struct sock *s; 1781 1782 write_lock_bh(&x25_list_lock); 1783 1784 sk_for_each(s, &x25_list) { 1785 if (x25_sk(s)->neighbour == nb) { 1786 write_unlock_bh(&x25_list_lock); 1787 lock_sock(s); 1788 x25_disconnect(s, ENETUNREACH, 0, 0); 1789 release_sock(s); 1790 write_lock_bh(&x25_list_lock); 1791 } 1792 } 1793 write_unlock_bh(&x25_list_lock); 1794 1795 /* Remove any related forwards */ 1796 x25_clear_forward_by_dev(nb->dev); 1797} 1798 1799static int __init x25_init(void) 1800{ 1801 int rc; 1802 1803 rc = proto_register(&x25_proto, 0); 1804 if (rc) 1805 goto out; 1806 1807 rc = sock_register(&x25_family_ops); 1808 if (rc) 1809 goto out_proto; 1810 1811 dev_add_pack(&x25_packet_type); 1812 1813 rc = register_netdevice_notifier(&x25_dev_notifier); 1814 if (rc) 1815 goto out_sock; 1816 1817 rc = x25_register_sysctl(); 1818 if (rc) 1819 goto out_dev; 1820 1821 rc = x25_proc_init(); 1822 if (rc) 1823 goto out_sysctl; 1824 1825 pr_info("Linux Version 0.2\n"); 1826 1827out: 1828 return rc; 1829out_sysctl: 1830 x25_unregister_sysctl(); 1831out_dev: 1832 unregister_netdevice_notifier(&x25_dev_notifier); 1833out_sock: 1834 dev_remove_pack(&x25_packet_type); 1835 sock_unregister(AF_X25); 1836out_proto: 1837 proto_unregister(&x25_proto); 1838 goto out; 1839} 1840module_init(x25_init); 1841 1842static void __exit x25_exit(void) 1843{ 1844 x25_proc_exit(); 1845 x25_link_free(); 1846 x25_route_free(); 1847 1848 x25_unregister_sysctl(); 1849 1850 unregister_netdevice_notifier(&x25_dev_notifier); 1851 1852 dev_remove_pack(&x25_packet_type); 1853 1854 sock_unregister(AF_X25); 1855 proto_unregister(&x25_proto); 1856} 1857module_exit(x25_exit); 1858 1859MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>"); 1860MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol"); 1861MODULE_LICENSE("GPL"); 1862MODULE_ALIAS_NETPROTO(PF_X25); 1863