1 /* 2 * X.25 Packet Layer release 002 3 * 4 * This is ALPHA test software. This code may break your machine, 5 * randomly fail to work with new releases, misbehave and/or generally 6 * screw up. It might even work. 7 * 8 * This code REQUIRES 2.1.15 or higher 9 * 10 * This module: 11 * This module is free software; you can redistribute it and/or 12 * modify it under the terms of the GNU General Public License 13 * as published by the Free Software Foundation; either version 14 * 2 of the License, or (at your option) any later version. 15 * 16 * History 17 * X.25 001 Jonathan Naylor Started coding. 18 * X.25 002 Jonathan Naylor Centralised disconnect handling. 19 * New timer architecture. 20 * 2000-03-11 Henner Eisen MSG_EOR handling more POSIX compliant. 21 * 2000-03-22 Daniela Squassoni Allowed disabling/enabling of 22 * facilities negotiation and increased 23 * the throughput upper limit. 24 * 2000-08-27 Arnaldo C. Melo s/suser/capable/ + micro cleanups 25 * 2000-09-04 Henner Eisen Set sock->state in x25_accept(). 26 * Fixed x25_output() related skb leakage. 27 * 2000-10-02 Henner Eisen Made x25_kick() single threaded per socket. 28 * 2000-10-27 Henner Eisen MSG_DONTWAIT for fragment allocation. 29 * 2000-11-14 Henner Eisen Closing datalink from NETDEV_GOING_DOWN 30 * 2002-10-06 Arnaldo C. Melo Get rid of cli/sti, move proc stuff to 31 * x25_proc.c, using seq_file 32 * 2005-04-02 Shaun Pereira Selective sub address matching 33 * with call user data 34 * 2005-04-15 Shaun Pereira Fast select with no restriction on 35 * response 36 */ 37 38 #include <linux/config.h> 39 #include <linux/module.h> 40 #include <linux/errno.h> 41 #include <linux/kernel.h> 42 #include <linux/sched.h> 43 #include <linux/timer.h> 44 #include <linux/string.h> 45 #include <linux/net.h> 46 #include <linux/netdevice.h> 47 #include <linux/if_arp.h> 48 #include <linux/skbuff.h> 49 #include <net/sock.h> 50 #include <net/tcp_states.h> 51 #include <asm/uaccess.h> 52 #include <linux/fcntl.h> 53 #include <linux/termios.h> /* For TIOCINQ/OUTQ */ 54 #include <linux/notifier.h> 55 #include <linux/init.h> 56 #include <net/x25.h> 57 58 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20; 59 int sysctl_x25_call_request_timeout = X25_DEFAULT_T21; 60 int sysctl_x25_reset_request_timeout = X25_DEFAULT_T22; 61 int sysctl_x25_clear_request_timeout = X25_DEFAULT_T23; 62 int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2; 63 64 HLIST_HEAD(x25_list); 65 DEFINE_RWLOCK(x25_list_lock); 66 67 static const struct proto_ops x25_proto_ops; 68 69 static struct x25_address null_x25_address = {" "}; 70 71 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr, 72 struct x25_address *calling_addr) 73 { 74 int called_len, calling_len; 75 char *called, *calling; 76 int i; 77 78 called_len = (*p >> 0) & 0x0F; 79 calling_len = (*p >> 4) & 0x0F; 80 81 called = called_addr->x25_addr; 82 calling = calling_addr->x25_addr; 83 p++; 84 85 for (i = 0; i < (called_len + calling_len); i++) { 86 if (i < called_len) { 87 if (i % 2 != 0) { 88 *called++ = ((*p >> 0) & 0x0F) + '0'; 89 p++; 90 } else { 91 *called++ = ((*p >> 4) & 0x0F) + '0'; 92 } 93 } else { 94 if (i % 2 != 0) { 95 *calling++ = ((*p >> 0) & 0x0F) + '0'; 96 p++; 97 } else { 98 *calling++ = ((*p >> 4) & 0x0F) + '0'; 99 } 100 } 101 } 102 103 *called = *calling = '\0'; 104 105 return 1 + (called_len + calling_len + 1) / 2; 106 } 107 108 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr, 109 struct x25_address *calling_addr) 110 { 111 unsigned int called_len, calling_len; 112 char *called, *calling; 113 int i; 114 115 called = called_addr->x25_addr; 116 calling = calling_addr->x25_addr; 117 118 called_len = strlen(called); 119 calling_len = strlen(calling); 120 121 *p++ = (calling_len << 4) | (called_len << 0); 122 123 for (i = 0; i < (called_len + calling_len); i++) { 124 if (i < called_len) { 125 if (i % 2 != 0) { 126 *p |= (*called++ - '0') << 0; 127 p++; 128 } else { 129 *p = 0x00; 130 *p |= (*called++ - '0') << 4; 131 } 132 } else { 133 if (i % 2 != 0) { 134 *p |= (*calling++ - '0') << 0; 135 p++; 136 } else { 137 *p = 0x00; 138 *p |= (*calling++ - '0') << 4; 139 } 140 } 141 } 142 143 return 1 + (called_len + calling_len + 1) / 2; 144 } 145 146 /* 147 * Socket removal during an interrupt is now safe. 148 */ 149 static void x25_remove_socket(struct sock *sk) 150 { 151 write_lock_bh(&x25_list_lock); 152 sk_del_node_init(sk); 153 write_unlock_bh(&x25_list_lock); 154 } 155 156 /* 157 * Kill all bound sockets on a dropped device. 158 */ 159 static void x25_kill_by_device(struct net_device *dev) 160 { 161 struct sock *s; 162 struct hlist_node *node; 163 164 write_lock_bh(&x25_list_lock); 165 166 sk_for_each(s, node, &x25_list) 167 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev) 168 x25_disconnect(s, ENETUNREACH, 0, 0); 169 170 write_unlock_bh(&x25_list_lock); 171 } 172 173 /* 174 * Handle device status changes. 175 */ 176 static int x25_device_event(struct notifier_block *this, unsigned long event, 177 void *ptr) 178 { 179 struct net_device *dev = ptr; 180 struct x25_neigh *nb; 181 182 if (dev->type == ARPHRD_X25 183 #if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE) 184 || dev->type == ARPHRD_ETHER 185 #endif 186 ) { 187 switch (event) { 188 case NETDEV_UP: 189 x25_link_device_up(dev); 190 break; 191 case NETDEV_GOING_DOWN: 192 nb = x25_get_neigh(dev); 193 if (nb) { 194 x25_terminate_link(nb); 195 x25_neigh_put(nb); 196 } 197 break; 198 case NETDEV_DOWN: 199 x25_kill_by_device(dev); 200 x25_route_device_down(dev); 201 x25_link_device_down(dev); 202 break; 203 } 204 } 205 206 return NOTIFY_DONE; 207 } 208 209 /* 210 * Add a socket to the bound sockets list. 211 */ 212 static void x25_insert_socket(struct sock *sk) 213 { 214 write_lock_bh(&x25_list_lock); 215 sk_add_node(sk, &x25_list); 216 write_unlock_bh(&x25_list_lock); 217 } 218 219 /* 220 * Find a socket that wants to accept the Call Request we just 221 * received. Check the full list for an address/cud match. 222 * If no cuds match return the next_best thing, an address match. 223 * Note: if a listening socket has cud set it must only get calls 224 * with matching cud. 225 */ 226 static struct sock *x25_find_listener(struct x25_address *addr, 227 struct sk_buff *skb) 228 { 229 struct sock *s; 230 struct sock *next_best; 231 struct hlist_node *node; 232 233 read_lock_bh(&x25_list_lock); 234 next_best = NULL; 235 236 sk_for_each(s, node, &x25_list) 237 if ((!strcmp(addr->x25_addr, 238 x25_sk(s)->source_addr.x25_addr) || 239 !strcmp(addr->x25_addr, 240 null_x25_address.x25_addr)) && 241 s->sk_state == TCP_LISTEN) { 242 /* 243 * Found a listening socket, now check the incoming 244 * call user data vs this sockets call user data 245 */ 246 if(skb->len > 0 && x25_sk(s)->cudmatchlength > 0) { 247 if((memcmp(x25_sk(s)->calluserdata.cuddata, 248 skb->data, 249 x25_sk(s)->cudmatchlength)) == 0) { 250 sock_hold(s); 251 goto found; 252 } 253 } else 254 next_best = s; 255 } 256 if (next_best) { 257 s = next_best; 258 sock_hold(s); 259 goto found; 260 } 261 s = NULL; 262 found: 263 read_unlock_bh(&x25_list_lock); 264 return s; 265 } 266 267 /* 268 * Find a connected X.25 socket given my LCI and neighbour. 269 */ 270 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb) 271 { 272 struct sock *s; 273 struct hlist_node *node; 274 275 sk_for_each(s, node, &x25_list) 276 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) { 277 sock_hold(s); 278 goto found; 279 } 280 s = NULL; 281 found: 282 return s; 283 } 284 285 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb) 286 { 287 struct sock *s; 288 289 read_lock_bh(&x25_list_lock); 290 s = __x25_find_socket(lci, nb); 291 read_unlock_bh(&x25_list_lock); 292 return s; 293 } 294 295 /* 296 * Find a unique LCI for a given device. 297 */ 298 static unsigned int x25_new_lci(struct x25_neigh *nb) 299 { 300 unsigned int lci = 1; 301 struct sock *sk; 302 303 read_lock_bh(&x25_list_lock); 304 305 while ((sk = __x25_find_socket(lci, nb)) != NULL) { 306 sock_put(sk); 307 if (++lci == 4096) { 308 lci = 0; 309 break; 310 } 311 } 312 313 read_unlock_bh(&x25_list_lock); 314 return lci; 315 } 316 317 /* 318 * Deferred destroy. 319 */ 320 void x25_destroy_socket(struct sock *); 321 322 /* 323 * handler for deferred kills. 324 */ 325 static void x25_destroy_timer(unsigned long data) 326 { 327 x25_destroy_socket((struct sock *)data); 328 } 329 330 /* 331 * This is called from user mode and the timers. Thus it protects itself 332 * against interrupt users but doesn't worry about being called during 333 * work. Once it is removed from the queue no interrupt or bottom half 334 * will touch it and we are (fairly 8-) ) safe. 335 * Not static as it's used by the timer 336 */ 337 void x25_destroy_socket(struct sock *sk) 338 { 339 struct sk_buff *skb; 340 341 sock_hold(sk); 342 lock_sock(sk); 343 x25_stop_heartbeat(sk); 344 x25_stop_timer(sk); 345 346 x25_remove_socket(sk); 347 x25_clear_queues(sk); /* Flush the queues */ 348 349 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { 350 if (skb->sk != sk) { /* A pending connection */ 351 /* 352 * Queue the unaccepted socket for death 353 */ 354 sock_set_flag(skb->sk, SOCK_DEAD); 355 x25_start_heartbeat(skb->sk); 356 x25_sk(skb->sk)->state = X25_STATE_0; 357 } 358 359 kfree_skb(skb); 360 } 361 362 if (atomic_read(&sk->sk_wmem_alloc) || 363 atomic_read(&sk->sk_rmem_alloc)) { 364 /* Defer: outstanding buffers */ 365 sk->sk_timer.expires = jiffies + 10 * HZ; 366 sk->sk_timer.function = x25_destroy_timer; 367 sk->sk_timer.data = (unsigned long)sk; 368 add_timer(&sk->sk_timer); 369 } else { 370 /* drop last reference so sock_put will free */ 371 __sock_put(sk); 372 } 373 374 release_sock(sk); 375 sock_put(sk); 376 } 377 378 /* 379 * Handling for system calls applied via the various interfaces to a 380 * X.25 socket object. 381 */ 382 383 static int x25_setsockopt(struct socket *sock, int level, int optname, 384 char __user *optval, int optlen) 385 { 386 int opt; 387 struct sock *sk = sock->sk; 388 int rc = -ENOPROTOOPT; 389 390 if (level != SOL_X25 || optname != X25_QBITINCL) 391 goto out; 392 393 rc = -EINVAL; 394 if (optlen < sizeof(int)) 395 goto out; 396 397 rc = -EFAULT; 398 if (get_user(opt, (int __user *)optval)) 399 goto out; 400 401 x25_sk(sk)->qbitincl = !!opt; 402 rc = 0; 403 out: 404 return rc; 405 } 406 407 static int x25_getsockopt(struct socket *sock, int level, int optname, 408 char __user *optval, int __user *optlen) 409 { 410 struct sock *sk = sock->sk; 411 int val, len, rc = -ENOPROTOOPT; 412 413 if (level != SOL_X25 || optname != X25_QBITINCL) 414 goto out; 415 416 rc = -EFAULT; 417 if (get_user(len, optlen)) 418 goto out; 419 420 len = min_t(unsigned int, len, sizeof(int)); 421 422 rc = -EINVAL; 423 if (len < 0) 424 goto out; 425 426 rc = -EFAULT; 427 if (put_user(len, optlen)) 428 goto out; 429 430 val = x25_sk(sk)->qbitincl; 431 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0; 432 out: 433 return rc; 434 } 435 436 static int x25_listen(struct socket *sock, int backlog) 437 { 438 struct sock *sk = sock->sk; 439 int rc = -EOPNOTSUPP; 440 441 if (sk->sk_state != TCP_LISTEN) { 442 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN); 443 sk->sk_max_ack_backlog = backlog; 444 sk->sk_state = TCP_LISTEN; 445 rc = 0; 446 } 447 448 return rc; 449 } 450 451 static struct proto x25_proto = { 452 .name = "X25", 453 .owner = THIS_MODULE, 454 .obj_size = sizeof(struct x25_sock), 455 }; 456 457 static struct sock *x25_alloc_socket(void) 458 { 459 struct x25_sock *x25; 460 struct sock *sk = sk_alloc(AF_X25, GFP_ATOMIC, &x25_proto, 1); 461 462 if (!sk) 463 goto out; 464 465 sock_init_data(NULL, sk); 466 467 x25 = x25_sk(sk); 468 skb_queue_head_init(&x25->ack_queue); 469 skb_queue_head_init(&x25->fragment_queue); 470 skb_queue_head_init(&x25->interrupt_in_queue); 471 skb_queue_head_init(&x25->interrupt_out_queue); 472 out: 473 return sk; 474 } 475 476 void x25_init_timers(struct sock *sk); 477 478 static int x25_create(struct socket *sock, int protocol) 479 { 480 struct sock *sk; 481 struct x25_sock *x25; 482 int rc = -ESOCKTNOSUPPORT; 483 484 if (sock->type != SOCK_SEQPACKET || protocol) 485 goto out; 486 487 rc = -ENOMEM; 488 if ((sk = x25_alloc_socket()) == NULL) 489 goto out; 490 491 x25 = x25_sk(sk); 492 493 sock_init_data(sock, sk); 494 495 x25_init_timers(sk); 496 497 sock->ops = &x25_proto_ops; 498 sk->sk_protocol = protocol; 499 sk->sk_backlog_rcv = x25_backlog_rcv; 500 501 x25->t21 = sysctl_x25_call_request_timeout; 502 x25->t22 = sysctl_x25_reset_request_timeout; 503 x25->t23 = sysctl_x25_clear_request_timeout; 504 x25->t2 = sysctl_x25_ack_holdback_timeout; 505 x25->state = X25_STATE_0; 506 x25->cudmatchlength = 0; 507 x25->accptapprv = X25_DENY_ACCPT_APPRV; /* normally no cud */ 508 /* on call accept */ 509 510 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE; 511 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE; 512 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE; 513 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE; 514 x25->facilities.throughput = X25_DEFAULT_THROUGHPUT; 515 x25->facilities.reverse = X25_DEFAULT_REVERSE; 516 rc = 0; 517 out: 518 return rc; 519 } 520 521 static struct sock *x25_make_new(struct sock *osk) 522 { 523 struct sock *sk = NULL; 524 struct x25_sock *x25, *ox25; 525 526 if (osk->sk_type != SOCK_SEQPACKET) 527 goto out; 528 529 if ((sk = x25_alloc_socket()) == NULL) 530 goto out; 531 532 x25 = x25_sk(sk); 533 534 sk->sk_type = osk->sk_type; 535 sk->sk_socket = osk->sk_socket; 536 sk->sk_priority = osk->sk_priority; 537 sk->sk_protocol = osk->sk_protocol; 538 sk->sk_rcvbuf = osk->sk_rcvbuf; 539 sk->sk_sndbuf = osk->sk_sndbuf; 540 sk->sk_state = TCP_ESTABLISHED; 541 sk->sk_sleep = osk->sk_sleep; 542 sk->sk_backlog_rcv = osk->sk_backlog_rcv; 543 sock_copy_flags(sk, osk); 544 545 ox25 = x25_sk(osk); 546 x25->t21 = ox25->t21; 547 x25->t22 = ox25->t22; 548 x25->t23 = ox25->t23; 549 x25->t2 = ox25->t2; 550 x25->facilities = ox25->facilities; 551 x25->qbitincl = ox25->qbitincl; 552 x25->cudmatchlength = ox25->cudmatchlength; 553 x25->accptapprv = ox25->accptapprv; 554 555 x25_init_timers(sk); 556 out: 557 return sk; 558 } 559 560 static int x25_release(struct socket *sock) 561 { 562 struct sock *sk = sock->sk; 563 struct x25_sock *x25; 564 565 if (!sk) 566 goto out; 567 568 x25 = x25_sk(sk); 569 570 switch (x25->state) { 571 572 case X25_STATE_0: 573 case X25_STATE_2: 574 x25_disconnect(sk, 0, 0, 0); 575 x25_destroy_socket(sk); 576 goto out; 577 578 case X25_STATE_1: 579 case X25_STATE_3: 580 case X25_STATE_4: 581 x25_clear_queues(sk); 582 x25_write_internal(sk, X25_CLEAR_REQUEST); 583 x25_start_t23timer(sk); 584 x25->state = X25_STATE_2; 585 sk->sk_state = TCP_CLOSE; 586 sk->sk_shutdown |= SEND_SHUTDOWN; 587 sk->sk_state_change(sk); 588 sock_set_flag(sk, SOCK_DEAD); 589 sock_set_flag(sk, SOCK_DESTROY); 590 break; 591 } 592 593 sock->sk = NULL; 594 sk->sk_socket = NULL; /* Not used, but we should do this */ 595 out: 596 return 0; 597 } 598 599 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 600 { 601 struct sock *sk = sock->sk; 602 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr; 603 604 if (!sock_flag(sk, SOCK_ZAPPED) || 605 addr_len != sizeof(struct sockaddr_x25) || 606 addr->sx25_family != AF_X25) 607 return -EINVAL; 608 609 x25_sk(sk)->source_addr = addr->sx25_addr; 610 x25_insert_socket(sk); 611 sock_reset_flag(sk, SOCK_ZAPPED); 612 SOCK_DEBUG(sk, "x25_bind: socket is bound\n"); 613 614 return 0; 615 } 616 617 static int x25_wait_for_connection_establishment(struct sock *sk) 618 { 619 DECLARE_WAITQUEUE(wait, current); 620 int rc; 621 622 add_wait_queue_exclusive(sk->sk_sleep, &wait); 623 for (;;) { 624 __set_current_state(TASK_INTERRUPTIBLE); 625 rc = -ERESTARTSYS; 626 if (signal_pending(current)) 627 break; 628 rc = sock_error(sk); 629 if (rc) { 630 sk->sk_socket->state = SS_UNCONNECTED; 631 break; 632 } 633 rc = 0; 634 if (sk->sk_state != TCP_ESTABLISHED) { 635 release_sock(sk); 636 schedule(); 637 lock_sock(sk); 638 } else 639 break; 640 } 641 __set_current_state(TASK_RUNNING); 642 remove_wait_queue(sk->sk_sleep, &wait); 643 return rc; 644 } 645 646 static int x25_connect(struct socket *sock, struct sockaddr *uaddr, 647 int addr_len, int flags) 648 { 649 struct sock *sk = sock->sk; 650 struct x25_sock *x25 = x25_sk(sk); 651 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr; 652 struct x25_route *rt; 653 int rc = 0; 654 655 lock_sock(sk); 656 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) { 657 sock->state = SS_CONNECTED; 658 goto out; /* Connect completed during a ERESTARTSYS event */ 659 } 660 661 rc = -ECONNREFUSED; 662 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) { 663 sock->state = SS_UNCONNECTED; 664 goto out; 665 } 666 667 rc = -EISCONN; /* No reconnect on a seqpacket socket */ 668 if (sk->sk_state == TCP_ESTABLISHED) 669 goto out; 670 671 sk->sk_state = TCP_CLOSE; 672 sock->state = SS_UNCONNECTED; 673 674 rc = -EINVAL; 675 if (addr_len != sizeof(struct sockaddr_x25) || 676 addr->sx25_family != AF_X25) 677 goto out; 678 679 rc = -ENETUNREACH; 680 rt = x25_get_route(&addr->sx25_addr); 681 if (!rt) 682 goto out; 683 684 x25->neighbour = x25_get_neigh(rt->dev); 685 if (!x25->neighbour) 686 goto out_put_route; 687 688 x25_limit_facilities(&x25->facilities, x25->neighbour); 689 690 x25->lci = x25_new_lci(x25->neighbour); 691 if (!x25->lci) 692 goto out_put_neigh; 693 694 rc = -EINVAL; 695 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */ 696 goto out_put_neigh; 697 698 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr)) 699 memset(&x25->source_addr, '\0', X25_ADDR_LEN); 700 701 x25->dest_addr = addr->sx25_addr; 702 703 /* Move to connecting socket, start sending Connect Requests */ 704 sock->state = SS_CONNECTING; 705 sk->sk_state = TCP_SYN_SENT; 706 707 x25->state = X25_STATE_1; 708 709 x25_write_internal(sk, X25_CALL_REQUEST); 710 711 x25_start_heartbeat(sk); 712 x25_start_t21timer(sk); 713 714 /* Now the loop */ 715 rc = -EINPROGRESS; 716 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) 717 goto out_put_neigh; 718 719 rc = x25_wait_for_connection_establishment(sk); 720 if (rc) 721 goto out_put_neigh; 722 723 sock->state = SS_CONNECTED; 724 rc = 0; 725 out_put_neigh: 726 if (rc) 727 x25_neigh_put(x25->neighbour); 728 out_put_route: 729 x25_route_put(rt); 730 out: 731 release_sock(sk); 732 return rc; 733 } 734 735 static int x25_wait_for_data(struct sock *sk, int timeout) 736 { 737 DECLARE_WAITQUEUE(wait, current); 738 int rc = 0; 739 740 add_wait_queue_exclusive(sk->sk_sleep, &wait); 741 for (;;) { 742 __set_current_state(TASK_INTERRUPTIBLE); 743 if (sk->sk_shutdown & RCV_SHUTDOWN) 744 break; 745 rc = -ERESTARTSYS; 746 if (signal_pending(current)) 747 break; 748 rc = -EAGAIN; 749 if (!timeout) 750 break; 751 rc = 0; 752 if (skb_queue_empty(&sk->sk_receive_queue)) { 753 release_sock(sk); 754 timeout = schedule_timeout(timeout); 755 lock_sock(sk); 756 } else 757 break; 758 } 759 __set_current_state(TASK_RUNNING); 760 remove_wait_queue(sk->sk_sleep, &wait); 761 return rc; 762 } 763 764 static int x25_accept(struct socket *sock, struct socket *newsock, int flags) 765 { 766 struct sock *sk = sock->sk; 767 struct sock *newsk; 768 struct sk_buff *skb; 769 int rc = -EINVAL; 770 771 if (!sk || sk->sk_state != TCP_LISTEN) 772 goto out; 773 774 rc = -EOPNOTSUPP; 775 if (sk->sk_type != SOCK_SEQPACKET) 776 goto out; 777 778 lock_sock(sk); 779 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo); 780 if (rc) 781 goto out2; 782 skb = skb_dequeue(&sk->sk_receive_queue); 783 rc = -EINVAL; 784 if (!skb->sk) 785 goto out2; 786 newsk = skb->sk; 787 newsk->sk_socket = newsock; 788 newsk->sk_sleep = &newsock->wait; 789 790 /* Now attach up the new socket */ 791 skb->sk = NULL; 792 kfree_skb(skb); 793 sk->sk_ack_backlog--; 794 newsock->sk = newsk; 795 newsock->state = SS_CONNECTED; 796 rc = 0; 797 out2: 798 release_sock(sk); 799 out: 800 return rc; 801 } 802 803 static int x25_getname(struct socket *sock, struct sockaddr *uaddr, 804 int *uaddr_len, int peer) 805 { 806 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr; 807 struct sock *sk = sock->sk; 808 struct x25_sock *x25 = x25_sk(sk); 809 810 if (peer) { 811 if (sk->sk_state != TCP_ESTABLISHED) 812 return -ENOTCONN; 813 sx25->sx25_addr = x25->dest_addr; 814 } else 815 sx25->sx25_addr = x25->source_addr; 816 817 sx25->sx25_family = AF_X25; 818 *uaddr_len = sizeof(*sx25); 819 820 return 0; 821 } 822 823 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb, 824 unsigned int lci) 825 { 826 struct sock *sk; 827 struct sock *make; 828 struct x25_sock *makex25; 829 struct x25_address source_addr, dest_addr; 830 struct x25_facilities facilities; 831 int len, rc; 832 833 /* 834 * Remove the LCI and frame type. 835 */ 836 skb_pull(skb, X25_STD_MIN_LEN); 837 838 /* 839 * Extract the X.25 addresses and convert them to ASCII strings, 840 * and remove them. 841 */ 842 skb_pull(skb, x25_addr_ntoa(skb->data, &source_addr, &dest_addr)); 843 844 /* 845 * Get the length of the facilities, skip past them for the moment 846 * get the call user data because this is needed to determine 847 * the correct listener 848 */ 849 len = skb->data[0] + 1; 850 skb_pull(skb,len); 851 852 /* 853 * Find a listener for the particular address/cud pair. 854 */ 855 sk = x25_find_listener(&source_addr,skb); 856 skb_push(skb,len); 857 858 /* 859 * We can't accept the Call Request. 860 */ 861 if (sk == NULL || sk_acceptq_is_full(sk)) 862 goto out_clear_request; 863 864 /* 865 * Try to reach a compromise on the requested facilities. 866 */ 867 if ((len = x25_negotiate_facilities(skb, sk, &facilities)) == -1) 868 goto out_sock_put; 869 870 /* 871 * current neighbour/link might impose additional limits 872 * on certain facilties 873 */ 874 875 x25_limit_facilities(&facilities, nb); 876 877 /* 878 * Try to create a new socket. 879 */ 880 make = x25_make_new(sk); 881 if (!make) 882 goto out_sock_put; 883 884 /* 885 * Remove the facilities 886 */ 887 skb_pull(skb, len); 888 889 skb->sk = make; 890 make->sk_state = TCP_ESTABLISHED; 891 892 makex25 = x25_sk(make); 893 makex25->lci = lci; 894 makex25->dest_addr = dest_addr; 895 makex25->source_addr = source_addr; 896 makex25->neighbour = nb; 897 makex25->facilities = facilities; 898 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask; 899 /* ensure no reverse facil on accept */ 900 makex25->vc_facil_mask &= ~X25_MASK_REVERSE; 901 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength; 902 903 /* Normally all calls are accepted immediatly */ 904 if(makex25->accptapprv & X25_DENY_ACCPT_APPRV) { 905 x25_write_internal(make, X25_CALL_ACCEPTED); 906 makex25->state = X25_STATE_3; 907 } 908 909 /* 910 * Incoming Call User Data. 911 */ 912 if (skb->len >= 0) { 913 memcpy(makex25->calluserdata.cuddata, skb->data, skb->len); 914 makex25->calluserdata.cudlength = skb->len; 915 } 916 917 sk->sk_ack_backlog++; 918 919 x25_insert_socket(make); 920 921 skb_queue_head(&sk->sk_receive_queue, skb); 922 923 x25_start_heartbeat(make); 924 925 if (!sock_flag(sk, SOCK_DEAD)) 926 sk->sk_data_ready(sk, skb->len); 927 rc = 1; 928 sock_put(sk); 929 out: 930 return rc; 931 out_sock_put: 932 sock_put(sk); 933 out_clear_request: 934 rc = 0; 935 x25_transmit_clear_request(nb, lci, 0x01); 936 goto out; 937 } 938 939 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock, 940 struct msghdr *msg, size_t len) 941 { 942 struct sock *sk = sock->sk; 943 struct x25_sock *x25 = x25_sk(sk); 944 struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name; 945 struct sockaddr_x25 sx25; 946 struct sk_buff *skb; 947 unsigned char *asmptr; 948 int noblock = msg->msg_flags & MSG_DONTWAIT; 949 size_t size; 950 int qbit = 0, rc = -EINVAL; 951 952 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT)) 953 goto out; 954 955 /* we currently don't support segmented records at the user interface */ 956 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB))) 957 goto out; 958 959 rc = -EADDRNOTAVAIL; 960 if (sock_flag(sk, SOCK_ZAPPED)) 961 goto out; 962 963 rc = -EPIPE; 964 if (sk->sk_shutdown & SEND_SHUTDOWN) { 965 send_sig(SIGPIPE, current, 0); 966 goto out; 967 } 968 969 rc = -ENETUNREACH; 970 if (!x25->neighbour) 971 goto out; 972 973 if (usx25) { 974 rc = -EINVAL; 975 if (msg->msg_namelen < sizeof(sx25)) 976 goto out; 977 memcpy(&sx25, usx25, sizeof(sx25)); 978 rc = -EISCONN; 979 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr)) 980 goto out; 981 rc = -EINVAL; 982 if (sx25.sx25_family != AF_X25) 983 goto out; 984 } else { 985 /* 986 * FIXME 1003.1g - if the socket is like this because 987 * it has become closed (not started closed) we ought 988 * to SIGPIPE, EPIPE; 989 */ 990 rc = -ENOTCONN; 991 if (sk->sk_state != TCP_ESTABLISHED) 992 goto out; 993 994 sx25.sx25_family = AF_X25; 995 sx25.sx25_addr = x25->dest_addr; 996 } 997 998 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n"); 999 1000 /* Build a packet */ 1001 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n"); 1002 1003 if ((msg->msg_flags & MSG_OOB) && len > 32) 1004 len = 32; 1005 1006 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN; 1007 1008 skb = sock_alloc_send_skb(sk, size, noblock, &rc); 1009 if (!skb) 1010 goto out; 1011 X25_SKB_CB(skb)->flags = msg->msg_flags; 1012 1013 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN); 1014 1015 /* 1016 * Put the data on the end 1017 */ 1018 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n"); 1019 1020 asmptr = skb->h.raw = skb_put(skb, len); 1021 1022 rc = memcpy_fromiovec(asmptr, msg->msg_iov, len); 1023 if (rc) 1024 goto out_kfree_skb; 1025 1026 /* 1027 * If the Q BIT Include socket option is in force, the first 1028 * byte of the user data is the logical value of the Q Bit. 1029 */ 1030 if (x25->qbitincl) { 1031 qbit = skb->data[0]; 1032 skb_pull(skb, 1); 1033 } 1034 1035 /* 1036 * Push down the X.25 header 1037 */ 1038 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n"); 1039 1040 if (msg->msg_flags & MSG_OOB) { 1041 if (x25->neighbour->extended) { 1042 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1043 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ; 1044 *asmptr++ = (x25->lci >> 0) & 0xFF; 1045 *asmptr++ = X25_INTERRUPT; 1046 } else { 1047 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1048 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ; 1049 *asmptr++ = (x25->lci >> 0) & 0xFF; 1050 *asmptr++ = X25_INTERRUPT; 1051 } 1052 } else { 1053 if (x25->neighbour->extended) { 1054 /* Build an Extended X.25 header */ 1055 asmptr = skb_push(skb, X25_EXT_MIN_LEN); 1056 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ; 1057 *asmptr++ = (x25->lci >> 0) & 0xFF; 1058 *asmptr++ = X25_DATA; 1059 *asmptr++ = X25_DATA; 1060 } else { 1061 /* Build an Standard X.25 header */ 1062 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1063 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ; 1064 *asmptr++ = (x25->lci >> 0) & 0xFF; 1065 *asmptr++ = X25_DATA; 1066 } 1067 1068 if (qbit) 1069 skb->data[0] |= X25_Q_BIT; 1070 } 1071 1072 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n"); 1073 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n"); 1074 1075 rc = -ENOTCONN; 1076 if (sk->sk_state != TCP_ESTABLISHED) 1077 goto out_kfree_skb; 1078 1079 if (msg->msg_flags & MSG_OOB) 1080 skb_queue_tail(&x25->interrupt_out_queue, skb); 1081 else { 1082 len = x25_output(sk, skb); 1083 if (len < 0) 1084 kfree_skb(skb); 1085 else if (x25->qbitincl) 1086 len++; 1087 } 1088 1089 /* 1090 * lock_sock() is currently only used to serialize this x25_kick() 1091 * against input-driven x25_kick() calls. It currently only blocks 1092 * incoming packets for this socket and does not protect against 1093 * any other socket state changes and is not called from anywhere 1094 * else. As x25_kick() cannot block and as long as all socket 1095 * operations are BKL-wrapped, we don't need take to care about 1096 * purging the backlog queue in x25_release(). 1097 * 1098 * Using lock_sock() to protect all socket operations entirely 1099 * (and making the whole x25 stack SMP aware) unfortunately would 1100 * require major changes to {send,recv}msg and skb allocation methods. 1101 * -> 2.5 ;) 1102 */ 1103 lock_sock(sk); 1104 x25_kick(sk); 1105 release_sock(sk); 1106 rc = len; 1107 out: 1108 return rc; 1109 out_kfree_skb: 1110 kfree_skb(skb); 1111 goto out; 1112 } 1113 1114 1115 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock, 1116 struct msghdr *msg, size_t size, 1117 int flags) 1118 { 1119 struct sock *sk = sock->sk; 1120 struct x25_sock *x25 = x25_sk(sk); 1121 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name; 1122 size_t copied; 1123 int qbit; 1124 struct sk_buff *skb; 1125 unsigned char *asmptr; 1126 int rc = -ENOTCONN; 1127 1128 /* 1129 * This works for seqpacket too. The receiver has ordered the queue for 1130 * us! We do one quick check first though 1131 */ 1132 if (sk->sk_state != TCP_ESTABLISHED) 1133 goto out; 1134 1135 if (flags & MSG_OOB) { 1136 rc = -EINVAL; 1137 if (sock_flag(sk, SOCK_URGINLINE) || 1138 !skb_peek(&x25->interrupt_in_queue)) 1139 goto out; 1140 1141 skb = skb_dequeue(&x25->interrupt_in_queue); 1142 1143 skb_pull(skb, X25_STD_MIN_LEN); 1144 1145 /* 1146 * No Q bit information on Interrupt data. 1147 */ 1148 if (x25->qbitincl) { 1149 asmptr = skb_push(skb, 1); 1150 *asmptr = 0x00; 1151 } 1152 1153 msg->msg_flags |= MSG_OOB; 1154 } else { 1155 /* Now we can treat all alike */ 1156 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, 1157 flags & MSG_DONTWAIT, &rc); 1158 if (!skb) 1159 goto out; 1160 1161 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT; 1162 1163 skb_pull(skb, x25->neighbour->extended ? 1164 X25_EXT_MIN_LEN : X25_STD_MIN_LEN); 1165 1166 if (x25->qbitincl) { 1167 asmptr = skb_push(skb, 1); 1168 *asmptr = qbit; 1169 } 1170 } 1171 1172 skb->h.raw = skb->data; 1173 1174 copied = skb->len; 1175 1176 if (copied > size) { 1177 copied = size; 1178 msg->msg_flags |= MSG_TRUNC; 1179 } 1180 1181 /* Currently, each datagram always contains a complete record */ 1182 msg->msg_flags |= MSG_EOR; 1183 1184 rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 1185 if (rc) 1186 goto out_free_dgram; 1187 1188 if (sx25) { 1189 sx25->sx25_family = AF_X25; 1190 sx25->sx25_addr = x25->dest_addr; 1191 } 1192 1193 msg->msg_namelen = sizeof(struct sockaddr_x25); 1194 1195 lock_sock(sk); 1196 x25_check_rbuf(sk); 1197 release_sock(sk); 1198 rc = copied; 1199 out_free_dgram: 1200 skb_free_datagram(sk, skb); 1201 out: 1202 return rc; 1203 } 1204 1205 1206 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1207 { 1208 struct sock *sk = sock->sk; 1209 struct x25_sock *x25 = x25_sk(sk); 1210 void __user *argp = (void __user *)arg; 1211 int rc; 1212 1213 switch (cmd) { 1214 case TIOCOUTQ: { 1215 int amount = sk->sk_sndbuf - 1216 atomic_read(&sk->sk_wmem_alloc); 1217 if (amount < 0) 1218 amount = 0; 1219 rc = put_user(amount, (unsigned int __user *)argp); 1220 break; 1221 } 1222 1223 case TIOCINQ: { 1224 struct sk_buff *skb; 1225 int amount = 0; 1226 /* 1227 * These two are safe on a single CPU system as 1228 * only user tasks fiddle here 1229 */ 1230 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) 1231 amount = skb->len; 1232 rc = put_user(amount, (unsigned int __user *)argp); 1233 break; 1234 } 1235 1236 case SIOCGSTAMP: 1237 rc = -EINVAL; 1238 if (sk) 1239 rc = sock_get_timestamp(sk, 1240 (struct timeval __user *)argp); 1241 break; 1242 case SIOCGIFADDR: 1243 case SIOCSIFADDR: 1244 case SIOCGIFDSTADDR: 1245 case SIOCSIFDSTADDR: 1246 case SIOCGIFBRDADDR: 1247 case SIOCSIFBRDADDR: 1248 case SIOCGIFNETMASK: 1249 case SIOCSIFNETMASK: 1250 case SIOCGIFMETRIC: 1251 case SIOCSIFMETRIC: 1252 rc = -EINVAL; 1253 break; 1254 case SIOCADDRT: 1255 case SIOCDELRT: 1256 rc = -EPERM; 1257 if (!capable(CAP_NET_ADMIN)) 1258 break; 1259 rc = x25_route_ioctl(cmd, argp); 1260 break; 1261 case SIOCX25GSUBSCRIP: 1262 rc = x25_subscr_ioctl(cmd, argp); 1263 break; 1264 case SIOCX25SSUBSCRIP: 1265 rc = -EPERM; 1266 if (!capable(CAP_NET_ADMIN)) 1267 break; 1268 rc = x25_subscr_ioctl(cmd, argp); 1269 break; 1270 case SIOCX25GFACILITIES: { 1271 struct x25_facilities fac = x25->facilities; 1272 rc = copy_to_user(argp, &fac, 1273 sizeof(fac)) ? -EFAULT : 0; 1274 break; 1275 } 1276 1277 case SIOCX25SFACILITIES: { 1278 struct x25_facilities facilities; 1279 rc = -EFAULT; 1280 if (copy_from_user(&facilities, argp, 1281 sizeof(facilities))) 1282 break; 1283 rc = -EINVAL; 1284 if (sk->sk_state != TCP_LISTEN && 1285 sk->sk_state != TCP_CLOSE) 1286 break; 1287 if (facilities.pacsize_in < X25_PS16 || 1288 facilities.pacsize_in > X25_PS4096) 1289 break; 1290 if (facilities.pacsize_out < X25_PS16 || 1291 facilities.pacsize_out > X25_PS4096) 1292 break; 1293 if (facilities.winsize_in < 1 || 1294 facilities.winsize_in > 127) 1295 break; 1296 if (facilities.throughput < 0x03 || 1297 facilities.throughput > 0xDD) 1298 break; 1299 if (facilities.reverse && 1300 (facilities.reverse | 0x81)!= 0x81) 1301 break; 1302 x25->facilities = facilities; 1303 rc = 0; 1304 break; 1305 } 1306 1307 case SIOCX25GCALLUSERDATA: { 1308 struct x25_calluserdata cud = x25->calluserdata; 1309 rc = copy_to_user(argp, &cud, 1310 sizeof(cud)) ? -EFAULT : 0; 1311 break; 1312 } 1313 1314 case SIOCX25SCALLUSERDATA: { 1315 struct x25_calluserdata calluserdata; 1316 1317 rc = -EFAULT; 1318 if (copy_from_user(&calluserdata, argp, 1319 sizeof(calluserdata))) 1320 break; 1321 rc = -EINVAL; 1322 if (calluserdata.cudlength > X25_MAX_CUD_LEN) 1323 break; 1324 x25->calluserdata = calluserdata; 1325 rc = 0; 1326 break; 1327 } 1328 1329 case SIOCX25GCAUSEDIAG: { 1330 struct x25_causediag causediag; 1331 causediag = x25->causediag; 1332 rc = copy_to_user(argp, &causediag, 1333 sizeof(causediag)) ? -EFAULT : 0; 1334 break; 1335 } 1336 1337 case SIOCX25SCUDMATCHLEN: { 1338 struct x25_subaddr sub_addr; 1339 rc = -EINVAL; 1340 if(sk->sk_state != TCP_CLOSE) 1341 break; 1342 rc = -EFAULT; 1343 if (copy_from_user(&sub_addr, argp, 1344 sizeof(sub_addr))) 1345 break; 1346 rc = -EINVAL; 1347 if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN) 1348 break; 1349 x25->cudmatchlength = sub_addr.cudmatchlength; 1350 rc = 0; 1351 break; 1352 } 1353 1354 case SIOCX25CALLACCPTAPPRV: { 1355 rc = -EINVAL; 1356 if (sk->sk_state != TCP_CLOSE) 1357 break; 1358 x25->accptapprv = X25_ALLOW_ACCPT_APPRV; 1359 rc = 0; 1360 break; 1361 } 1362 1363 case SIOCX25SENDCALLACCPT: { 1364 rc = -EINVAL; 1365 if (sk->sk_state != TCP_ESTABLISHED) 1366 break; 1367 if (x25->accptapprv) /* must call accptapprv above */ 1368 break; 1369 x25_write_internal(sk, X25_CALL_ACCEPTED); 1370 x25->state = X25_STATE_3; 1371 rc = 0; 1372 break; 1373 } 1374 1375 default: 1376 rc = -ENOIOCTLCMD; 1377 break; 1378 } 1379 1380 return rc; 1381 } 1382 1383 static struct net_proto_family x25_family_ops = { 1384 .family = AF_X25, 1385 .create = x25_create, 1386 .owner = THIS_MODULE, 1387 }; 1388 1389 static const struct proto_ops SOCKOPS_WRAPPED(x25_proto_ops) = { 1390 .family = AF_X25, 1391 .owner = THIS_MODULE, 1392 .release = x25_release, 1393 .bind = x25_bind, 1394 .connect = x25_connect, 1395 .socketpair = sock_no_socketpair, 1396 .accept = x25_accept, 1397 .getname = x25_getname, 1398 .poll = datagram_poll, 1399 .ioctl = x25_ioctl, 1400 .listen = x25_listen, 1401 .shutdown = sock_no_shutdown, 1402 .setsockopt = x25_setsockopt, 1403 .getsockopt = x25_getsockopt, 1404 .sendmsg = x25_sendmsg, 1405 .recvmsg = x25_recvmsg, 1406 .mmap = sock_no_mmap, 1407 .sendpage = sock_no_sendpage, 1408 }; 1409 1410 #include <linux/smp_lock.h> 1411 SOCKOPS_WRAP(x25_proto, AF_X25); 1412 1413 static struct packet_type x25_packet_type = { 1414 .type = __constant_htons(ETH_P_X25), 1415 .func = x25_lapb_receive_frame, 1416 }; 1417 1418 static struct notifier_block x25_dev_notifier = { 1419 .notifier_call = x25_device_event, 1420 }; 1421 1422 void x25_kill_by_neigh(struct x25_neigh *nb) 1423 { 1424 struct sock *s; 1425 struct hlist_node *node; 1426 1427 write_lock_bh(&x25_list_lock); 1428 1429 sk_for_each(s, node, &x25_list) 1430 if (x25_sk(s)->neighbour == nb) 1431 x25_disconnect(s, ENETUNREACH, 0, 0); 1432 1433 write_unlock_bh(&x25_list_lock); 1434 } 1435 1436 static int __init x25_init(void) 1437 { 1438 int rc = proto_register(&x25_proto, 0); 1439 1440 if (rc != 0) 1441 goto out; 1442 1443 sock_register(&x25_family_ops); 1444 1445 dev_add_pack(&x25_packet_type); 1446 1447 register_netdevice_notifier(&x25_dev_notifier); 1448 1449 printk(KERN_INFO "X.25 for Linux. Version 0.2 for Linux 2.1.15\n"); 1450 1451 #ifdef CONFIG_SYSCTL 1452 x25_register_sysctl(); 1453 #endif 1454 x25_proc_init(); 1455 out: 1456 return rc; 1457 } 1458 module_init(x25_init); 1459 1460 static void __exit x25_exit(void) 1461 { 1462 x25_proc_exit(); 1463 x25_link_free(); 1464 x25_route_free(); 1465 1466 #ifdef CONFIG_SYSCTL 1467 x25_unregister_sysctl(); 1468 #endif 1469 1470 unregister_netdevice_notifier(&x25_dev_notifier); 1471 1472 dev_remove_pack(&x25_packet_type); 1473 1474 sock_unregister(AF_X25); 1475 proto_unregister(&x25_proto); 1476 } 1477 module_exit(x25_exit); 1478 1479 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>"); 1480 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol"); 1481 MODULE_LICENSE("GPL"); 1482 MODULE_ALIAS_NETPROTO(PF_X25); 1483