1 /* 2 * This program is free software; you can redistribute it and/or modify 3 * it under the terms of the GNU General Public License as published by 4 * the Free Software Foundation; either version 2 of the License, or 5 * (at your option) any later version. 6 * 7 * Copyright Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) 8 * Copyright Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk) 9 * Copyright Darryl Miles G7LED (dlm@g7led.demon.co.uk) 10 */ 11 #include <linux/module.h> 12 #include <linux/moduleparam.h> 13 #include <linux/capability.h> 14 #include <linux/errno.h> 15 #include <linux/types.h> 16 #include <linux/socket.h> 17 #include <linux/in.h> 18 #include <linux/kernel.h> 19 #include <linux/sched.h> 20 #include <linux/timer.h> 21 #include <linux/string.h> 22 #include <linux/sockios.h> 23 #include <linux/net.h> 24 #include <linux/stat.h> 25 #include <net/ax25.h> 26 #include <linux/inet.h> 27 #include <linux/netdevice.h> 28 #include <linux/if_arp.h> 29 #include <linux/skbuff.h> 30 #include <net/net_namespace.h> 31 #include <net/sock.h> 32 #include <asm/uaccess.h> 33 #include <asm/system.h> 34 #include <linux/fcntl.h> 35 #include <linux/termios.h> /* For TIOCINQ/OUTQ */ 36 #include <linux/mm.h> 37 #include <linux/interrupt.h> 38 #include <linux/notifier.h> 39 #include <net/netrom.h> 40 #include <linux/proc_fs.h> 41 #include <linux/seq_file.h> 42 #include <net/ip.h> 43 #include <net/tcp_states.h> 44 #include <net/arp.h> 45 #include <linux/init.h> 46 47 static int nr_ndevs = 4; 48 49 int sysctl_netrom_default_path_quality = NR_DEFAULT_QUAL; 50 int sysctl_netrom_obsolescence_count_initialiser = NR_DEFAULT_OBS; 51 int sysctl_netrom_network_ttl_initialiser = NR_DEFAULT_TTL; 52 int sysctl_netrom_transport_timeout = NR_DEFAULT_T1; 53 int sysctl_netrom_transport_maximum_tries = NR_DEFAULT_N2; 54 int sysctl_netrom_transport_acknowledge_delay = NR_DEFAULT_T2; 55 int sysctl_netrom_transport_busy_delay = NR_DEFAULT_T4; 56 int sysctl_netrom_transport_requested_window_size = NR_DEFAULT_WINDOW; 57 int sysctl_netrom_transport_no_activity_timeout = NR_DEFAULT_IDLE; 58 int sysctl_netrom_routing_control = NR_DEFAULT_ROUTING; 59 int sysctl_netrom_link_fails_count = NR_DEFAULT_FAILS; 60 int sysctl_netrom_reset_circuit = NR_DEFAULT_RESET; 61 62 static unsigned short circuit = 0x101; 63 64 static HLIST_HEAD(nr_list); 65 static DEFINE_SPINLOCK(nr_list_lock); 66 67 static const struct proto_ops nr_proto_ops; 68 69 /* 70 * NETROM network devices are virtual network devices encapsulating NETROM 71 * frames into AX.25 which will be sent through an AX.25 device, so form a 72 * special "super class" of normal net devices; split their locks off into a 73 * separate class since they always nest. 74 */ 75 static struct lock_class_key nr_netdev_xmit_lock_key; 76 77 /* 78 * Socket removal during an interrupt is now safe. 79 */ 80 static void nr_remove_socket(struct sock *sk) 81 { 82 spin_lock_bh(&nr_list_lock); 83 sk_del_node_init(sk); 84 spin_unlock_bh(&nr_list_lock); 85 } 86 87 /* 88 * Kill all bound sockets on a dropped device. 89 */ 90 static void nr_kill_by_device(struct net_device *dev) 91 { 92 struct sock *s; 93 struct hlist_node *node; 94 95 spin_lock_bh(&nr_list_lock); 96 sk_for_each(s, node, &nr_list) 97 if (nr_sk(s)->device == dev) 98 nr_disconnect(s, ENETUNREACH); 99 spin_unlock_bh(&nr_list_lock); 100 } 101 102 /* 103 * Handle device status changes. 104 */ 105 static int nr_device_event(struct notifier_block *this, unsigned long event, void *ptr) 106 { 107 struct net_device *dev = (struct net_device *)ptr; 108 109 if (dev->nd_net != &init_net) 110 return NOTIFY_DONE; 111 112 if (event != NETDEV_DOWN) 113 return NOTIFY_DONE; 114 115 nr_kill_by_device(dev); 116 nr_rt_device_down(dev); 117 118 return NOTIFY_DONE; 119 } 120 121 /* 122 * Add a socket to the bound sockets list. 123 */ 124 static void nr_insert_socket(struct sock *sk) 125 { 126 spin_lock_bh(&nr_list_lock); 127 sk_add_node(sk, &nr_list); 128 spin_unlock_bh(&nr_list_lock); 129 } 130 131 /* 132 * Find a socket that wants to accept the Connect Request we just 133 * received. 134 */ 135 static struct sock *nr_find_listener(ax25_address *addr) 136 { 137 struct sock *s; 138 struct hlist_node *node; 139 140 spin_lock_bh(&nr_list_lock); 141 sk_for_each(s, node, &nr_list) 142 if (!ax25cmp(&nr_sk(s)->source_addr, addr) && 143 s->sk_state == TCP_LISTEN) { 144 bh_lock_sock(s); 145 goto found; 146 } 147 s = NULL; 148 found: 149 spin_unlock_bh(&nr_list_lock); 150 return s; 151 } 152 153 /* 154 * Find a connected NET/ROM socket given my circuit IDs. 155 */ 156 static struct sock *nr_find_socket(unsigned char index, unsigned char id) 157 { 158 struct sock *s; 159 struct hlist_node *node; 160 161 spin_lock_bh(&nr_list_lock); 162 sk_for_each(s, node, &nr_list) { 163 struct nr_sock *nr = nr_sk(s); 164 165 if (nr->my_index == index && nr->my_id == id) { 166 bh_lock_sock(s); 167 goto found; 168 } 169 } 170 s = NULL; 171 found: 172 spin_unlock_bh(&nr_list_lock); 173 return s; 174 } 175 176 /* 177 * Find a connected NET/ROM socket given their circuit IDs. 178 */ 179 static struct sock *nr_find_peer(unsigned char index, unsigned char id, 180 ax25_address *dest) 181 { 182 struct sock *s; 183 struct hlist_node *node; 184 185 spin_lock_bh(&nr_list_lock); 186 sk_for_each(s, node, &nr_list) { 187 struct nr_sock *nr = nr_sk(s); 188 189 if (nr->your_index == index && nr->your_id == id && 190 !ax25cmp(&nr->dest_addr, dest)) { 191 bh_lock_sock(s); 192 goto found; 193 } 194 } 195 s = NULL; 196 found: 197 spin_unlock_bh(&nr_list_lock); 198 return s; 199 } 200 201 /* 202 * Find next free circuit ID. 203 */ 204 static unsigned short nr_find_next_circuit(void) 205 { 206 unsigned short id = circuit; 207 unsigned char i, j; 208 struct sock *sk; 209 210 for (;;) { 211 i = id / 256; 212 j = id % 256; 213 214 if (i != 0 && j != 0) { 215 if ((sk=nr_find_socket(i, j)) == NULL) 216 break; 217 bh_unlock_sock(sk); 218 } 219 220 id++; 221 } 222 223 return id; 224 } 225 226 /* 227 * Deferred destroy. 228 */ 229 void nr_destroy_socket(struct sock *); 230 231 /* 232 * Handler for deferred kills. 233 */ 234 static void nr_destroy_timer(unsigned long data) 235 { 236 struct sock *sk=(struct sock *)data; 237 bh_lock_sock(sk); 238 sock_hold(sk); 239 nr_destroy_socket(sk); 240 bh_unlock_sock(sk); 241 sock_put(sk); 242 } 243 244 /* 245 * This is called from user mode and the timers. Thus it protects itself 246 * against interrupt users but doesn't worry about being called during 247 * work. Once it is removed from the queue no interrupt or bottom half 248 * will touch it and we are (fairly 8-) ) safe. 249 */ 250 void nr_destroy_socket(struct sock *sk) 251 { 252 struct sk_buff *skb; 253 254 nr_remove_socket(sk); 255 256 nr_stop_heartbeat(sk); 257 nr_stop_t1timer(sk); 258 nr_stop_t2timer(sk); 259 nr_stop_t4timer(sk); 260 nr_stop_idletimer(sk); 261 262 nr_clear_queues(sk); /* Flush the queues */ 263 264 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { 265 if (skb->sk != sk) { /* A pending connection */ 266 /* Queue the unaccepted socket for death */ 267 sock_set_flag(skb->sk, SOCK_DEAD); 268 nr_start_heartbeat(skb->sk); 269 nr_sk(skb->sk)->state = NR_STATE_0; 270 } 271 272 kfree_skb(skb); 273 } 274 275 if (atomic_read(&sk->sk_wmem_alloc) || 276 atomic_read(&sk->sk_rmem_alloc)) { 277 /* Defer: outstanding buffers */ 278 sk->sk_timer.function = nr_destroy_timer; 279 sk->sk_timer.expires = jiffies + 2 * HZ; 280 add_timer(&sk->sk_timer); 281 } else 282 sock_put(sk); 283 } 284 285 /* 286 * Handling for system calls applied via the various interfaces to a 287 * NET/ROM socket object. 288 */ 289 290 static int nr_setsockopt(struct socket *sock, int level, int optname, 291 char __user *optval, int optlen) 292 { 293 struct sock *sk = sock->sk; 294 struct nr_sock *nr = nr_sk(sk); 295 int opt; 296 297 if (level != SOL_NETROM) 298 return -ENOPROTOOPT; 299 300 if (optlen < sizeof(int)) 301 return -EINVAL; 302 303 if (get_user(opt, (int __user *)optval)) 304 return -EFAULT; 305 306 switch (optname) { 307 case NETROM_T1: 308 if (opt < 1) 309 return -EINVAL; 310 nr->t1 = opt * HZ; 311 return 0; 312 313 case NETROM_T2: 314 if (opt < 1) 315 return -EINVAL; 316 nr->t2 = opt * HZ; 317 return 0; 318 319 case NETROM_N2: 320 if (opt < 1 || opt > 31) 321 return -EINVAL; 322 nr->n2 = opt; 323 return 0; 324 325 case NETROM_T4: 326 if (opt < 1) 327 return -EINVAL; 328 nr->t4 = opt * HZ; 329 return 0; 330 331 case NETROM_IDLE: 332 if (opt < 0) 333 return -EINVAL; 334 nr->idle = opt * 60 * HZ; 335 return 0; 336 337 default: 338 return -ENOPROTOOPT; 339 } 340 } 341 342 static int nr_getsockopt(struct socket *sock, int level, int optname, 343 char __user *optval, int __user *optlen) 344 { 345 struct sock *sk = sock->sk; 346 struct nr_sock *nr = nr_sk(sk); 347 int val = 0; 348 int len; 349 350 if (level != SOL_NETROM) 351 return -ENOPROTOOPT; 352 353 if (get_user(len, optlen)) 354 return -EFAULT; 355 356 if (len < 0) 357 return -EINVAL; 358 359 switch (optname) { 360 case NETROM_T1: 361 val = nr->t1 / HZ; 362 break; 363 364 case NETROM_T2: 365 val = nr->t2 / HZ; 366 break; 367 368 case NETROM_N2: 369 val = nr->n2; 370 break; 371 372 case NETROM_T4: 373 val = nr->t4 / HZ; 374 break; 375 376 case NETROM_IDLE: 377 val = nr->idle / (60 * HZ); 378 break; 379 380 default: 381 return -ENOPROTOOPT; 382 } 383 384 len = min_t(unsigned int, len, sizeof(int)); 385 386 if (put_user(len, optlen)) 387 return -EFAULT; 388 389 return copy_to_user(optval, &val, len) ? -EFAULT : 0; 390 } 391 392 static int nr_listen(struct socket *sock, int backlog) 393 { 394 struct sock *sk = sock->sk; 395 396 lock_sock(sk); 397 if (sk->sk_state != TCP_LISTEN) { 398 memset(&nr_sk(sk)->user_addr, 0, AX25_ADDR_LEN); 399 sk->sk_max_ack_backlog = backlog; 400 sk->sk_state = TCP_LISTEN; 401 release_sock(sk); 402 return 0; 403 } 404 release_sock(sk); 405 406 return -EOPNOTSUPP; 407 } 408 409 static struct proto nr_proto = { 410 .name = "NETROM", 411 .owner = THIS_MODULE, 412 .obj_size = sizeof(struct nr_sock), 413 }; 414 415 static int nr_create(struct net *net, struct socket *sock, int protocol) 416 { 417 struct sock *sk; 418 struct nr_sock *nr; 419 420 if (net != &init_net) 421 return -EAFNOSUPPORT; 422 423 if (sock->type != SOCK_SEQPACKET || protocol != 0) 424 return -ESOCKTNOSUPPORT; 425 426 if ((sk = sk_alloc(net, PF_NETROM, GFP_ATOMIC, &nr_proto, 1)) == NULL) 427 return -ENOMEM; 428 429 nr = nr_sk(sk); 430 431 sock_init_data(sock, sk); 432 433 sock->ops = &nr_proto_ops; 434 sk->sk_protocol = protocol; 435 436 skb_queue_head_init(&nr->ack_queue); 437 skb_queue_head_init(&nr->reseq_queue); 438 skb_queue_head_init(&nr->frag_queue); 439 440 nr_init_timers(sk); 441 442 nr->t1 = 443 msecs_to_jiffies(sysctl_netrom_transport_timeout); 444 nr->t2 = 445 msecs_to_jiffies(sysctl_netrom_transport_acknowledge_delay); 446 nr->n2 = 447 msecs_to_jiffies(sysctl_netrom_transport_maximum_tries); 448 nr->t4 = 449 msecs_to_jiffies(sysctl_netrom_transport_busy_delay); 450 nr->idle = 451 msecs_to_jiffies(sysctl_netrom_transport_no_activity_timeout); 452 nr->window = sysctl_netrom_transport_requested_window_size; 453 454 nr->bpqext = 1; 455 nr->state = NR_STATE_0; 456 457 return 0; 458 } 459 460 static struct sock *nr_make_new(struct sock *osk) 461 { 462 struct sock *sk; 463 struct nr_sock *nr, *onr; 464 465 if (osk->sk_type != SOCK_SEQPACKET) 466 return NULL; 467 468 if ((sk = sk_alloc(osk->sk_net, PF_NETROM, GFP_ATOMIC, osk->sk_prot, 1)) == NULL) 469 return NULL; 470 471 nr = nr_sk(sk); 472 473 sock_init_data(NULL, sk); 474 475 sk->sk_type = osk->sk_type; 476 sk->sk_socket = osk->sk_socket; 477 sk->sk_priority = osk->sk_priority; 478 sk->sk_protocol = osk->sk_protocol; 479 sk->sk_rcvbuf = osk->sk_rcvbuf; 480 sk->sk_sndbuf = osk->sk_sndbuf; 481 sk->sk_state = TCP_ESTABLISHED; 482 sk->sk_sleep = osk->sk_sleep; 483 sock_copy_flags(sk, osk); 484 485 skb_queue_head_init(&nr->ack_queue); 486 skb_queue_head_init(&nr->reseq_queue); 487 skb_queue_head_init(&nr->frag_queue); 488 489 nr_init_timers(sk); 490 491 onr = nr_sk(osk); 492 493 nr->t1 = onr->t1; 494 nr->t2 = onr->t2; 495 nr->n2 = onr->n2; 496 nr->t4 = onr->t4; 497 nr->idle = onr->idle; 498 nr->window = onr->window; 499 500 nr->device = onr->device; 501 nr->bpqext = onr->bpqext; 502 503 return sk; 504 } 505 506 static int nr_release(struct socket *sock) 507 { 508 struct sock *sk = sock->sk; 509 struct nr_sock *nr; 510 511 if (sk == NULL) return 0; 512 513 sock_hold(sk); 514 lock_sock(sk); 515 nr = nr_sk(sk); 516 517 switch (nr->state) { 518 case NR_STATE_0: 519 case NR_STATE_1: 520 case NR_STATE_2: 521 nr_disconnect(sk, 0); 522 nr_destroy_socket(sk); 523 break; 524 525 case NR_STATE_3: 526 nr_clear_queues(sk); 527 nr->n2count = 0; 528 nr_write_internal(sk, NR_DISCREQ); 529 nr_start_t1timer(sk); 530 nr_stop_t2timer(sk); 531 nr_stop_t4timer(sk); 532 nr_stop_idletimer(sk); 533 nr->state = NR_STATE_2; 534 sk->sk_state = TCP_CLOSE; 535 sk->sk_shutdown |= SEND_SHUTDOWN; 536 sk->sk_state_change(sk); 537 sock_orphan(sk); 538 sock_set_flag(sk, SOCK_DESTROY); 539 sk->sk_socket = NULL; 540 break; 541 542 default: 543 sk->sk_socket = NULL; 544 break; 545 } 546 547 sock->sk = NULL; 548 release_sock(sk); 549 sock_put(sk); 550 551 return 0; 552 } 553 554 static int nr_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 555 { 556 struct sock *sk = sock->sk; 557 struct nr_sock *nr = nr_sk(sk); 558 struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr; 559 struct net_device *dev; 560 ax25_uid_assoc *user; 561 ax25_address *source; 562 563 lock_sock(sk); 564 if (!sock_flag(sk, SOCK_ZAPPED)) { 565 release_sock(sk); 566 return -EINVAL; 567 } 568 if (addr_len < sizeof(struct sockaddr_ax25) || addr_len > sizeof(struct full_sockaddr_ax25)) { 569 release_sock(sk); 570 return -EINVAL; 571 } 572 if (addr_len < (addr->fsa_ax25.sax25_ndigis * sizeof(ax25_address) + sizeof(struct sockaddr_ax25))) { 573 release_sock(sk); 574 return -EINVAL; 575 } 576 if (addr->fsa_ax25.sax25_family != AF_NETROM) { 577 release_sock(sk); 578 return -EINVAL; 579 } 580 if ((dev = nr_dev_get(&addr->fsa_ax25.sax25_call)) == NULL) { 581 SOCK_DEBUG(sk, "NET/ROM: bind failed: invalid node callsign\n"); 582 release_sock(sk); 583 return -EADDRNOTAVAIL; 584 } 585 586 /* 587 * Only the super user can set an arbitrary user callsign. 588 */ 589 if (addr->fsa_ax25.sax25_ndigis == 1) { 590 if (!capable(CAP_NET_BIND_SERVICE)) { 591 dev_put(dev); 592 release_sock(sk); 593 return -EACCES; 594 } 595 nr->user_addr = addr->fsa_digipeater[0]; 596 nr->source_addr = addr->fsa_ax25.sax25_call; 597 } else { 598 source = &addr->fsa_ax25.sax25_call; 599 600 user = ax25_findbyuid(current->euid); 601 if (user) { 602 nr->user_addr = user->call; 603 ax25_uid_put(user); 604 } else { 605 if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) { 606 release_sock(sk); 607 dev_put(dev); 608 return -EPERM; 609 } 610 nr->user_addr = *source; 611 } 612 613 nr->source_addr = *source; 614 } 615 616 nr->device = dev; 617 nr_insert_socket(sk); 618 619 sock_reset_flag(sk, SOCK_ZAPPED); 620 dev_put(dev); 621 release_sock(sk); 622 SOCK_DEBUG(sk, "NET/ROM: socket is bound\n"); 623 return 0; 624 } 625 626 static int nr_connect(struct socket *sock, struct sockaddr *uaddr, 627 int addr_len, int flags) 628 { 629 struct sock *sk = sock->sk; 630 struct nr_sock *nr = nr_sk(sk); 631 struct sockaddr_ax25 *addr = (struct sockaddr_ax25 *)uaddr; 632 ax25_address *source = NULL; 633 ax25_uid_assoc *user; 634 struct net_device *dev; 635 int err = 0; 636 637 lock_sock(sk); 638 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) { 639 sock->state = SS_CONNECTED; 640 goto out_release; /* Connect completed during a ERESTARTSYS event */ 641 } 642 643 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) { 644 sock->state = SS_UNCONNECTED; 645 err = -ECONNREFUSED; 646 goto out_release; 647 } 648 649 if (sk->sk_state == TCP_ESTABLISHED) { 650 err = -EISCONN; /* No reconnect on a seqpacket socket */ 651 goto out_release; 652 } 653 654 sk->sk_state = TCP_CLOSE; 655 sock->state = SS_UNCONNECTED; 656 657 if (addr_len != sizeof(struct sockaddr_ax25) && addr_len != sizeof(struct full_sockaddr_ax25)) { 658 err = -EINVAL; 659 goto out_release; 660 } 661 if (addr->sax25_family != AF_NETROM) { 662 err = -EINVAL; 663 goto out_release; 664 } 665 if (sock_flag(sk, SOCK_ZAPPED)) { /* Must bind first - autobinding in this may or may not work */ 666 sock_reset_flag(sk, SOCK_ZAPPED); 667 668 if ((dev = nr_dev_first()) == NULL) { 669 err = -ENETUNREACH; 670 goto out_release; 671 } 672 source = (ax25_address *)dev->dev_addr; 673 674 user = ax25_findbyuid(current->euid); 675 if (user) { 676 nr->user_addr = user->call; 677 ax25_uid_put(user); 678 } else { 679 if (ax25_uid_policy && !capable(CAP_NET_ADMIN)) { 680 dev_put(dev); 681 err = -EPERM; 682 goto out_release; 683 } 684 nr->user_addr = *source; 685 } 686 687 nr->source_addr = *source; 688 nr->device = dev; 689 690 dev_put(dev); 691 nr_insert_socket(sk); /* Finish the bind */ 692 } 693 694 nr->dest_addr = addr->sax25_call; 695 696 release_sock(sk); 697 circuit = nr_find_next_circuit(); 698 lock_sock(sk); 699 700 nr->my_index = circuit / 256; 701 nr->my_id = circuit % 256; 702 703 circuit++; 704 705 /* Move to connecting socket, start sending Connect Requests */ 706 sock->state = SS_CONNECTING; 707 sk->sk_state = TCP_SYN_SENT; 708 709 nr_establish_data_link(sk); 710 711 nr->state = NR_STATE_1; 712 713 nr_start_heartbeat(sk); 714 715 /* Now the loop */ 716 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) { 717 err = -EINPROGRESS; 718 goto out_release; 719 } 720 721 /* 722 * A Connect Ack with Choke or timeout or failed routing will go to 723 * closed. 724 */ 725 if (sk->sk_state == TCP_SYN_SENT) { 726 DEFINE_WAIT(wait); 727 728 for (;;) { 729 prepare_to_wait(sk->sk_sleep, &wait, 730 TASK_INTERRUPTIBLE); 731 if (sk->sk_state != TCP_SYN_SENT) 732 break; 733 if (!signal_pending(current)) { 734 release_sock(sk); 735 schedule(); 736 lock_sock(sk); 737 continue; 738 } 739 err = -ERESTARTSYS; 740 break; 741 } 742 finish_wait(sk->sk_sleep, &wait); 743 if (err) 744 goto out_release; 745 } 746 747 if (sk->sk_state != TCP_ESTABLISHED) { 748 sock->state = SS_UNCONNECTED; 749 err = sock_error(sk); /* Always set at this point */ 750 goto out_release; 751 } 752 753 sock->state = SS_CONNECTED; 754 755 out_release: 756 release_sock(sk); 757 758 return err; 759 } 760 761 static int nr_accept(struct socket *sock, struct socket *newsock, int flags) 762 { 763 struct sk_buff *skb; 764 struct sock *newsk; 765 DEFINE_WAIT(wait); 766 struct sock *sk; 767 int err = 0; 768 769 if ((sk = sock->sk) == NULL) 770 return -EINVAL; 771 772 lock_sock(sk); 773 if (sk->sk_type != SOCK_SEQPACKET) { 774 err = -EOPNOTSUPP; 775 goto out_release; 776 } 777 778 if (sk->sk_state != TCP_LISTEN) { 779 err = -EINVAL; 780 goto out_release; 781 } 782 783 /* 784 * The write queue this time is holding sockets ready to use 785 * hooked into the SABM we saved 786 */ 787 for (;;) { 788 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 789 skb = skb_dequeue(&sk->sk_receive_queue); 790 if (skb) 791 break; 792 793 if (flags & O_NONBLOCK) { 794 err = -EWOULDBLOCK; 795 break; 796 } 797 if (!signal_pending(current)) { 798 release_sock(sk); 799 schedule(); 800 lock_sock(sk); 801 continue; 802 } 803 err = -ERESTARTSYS; 804 break; 805 } 806 finish_wait(sk->sk_sleep, &wait); 807 if (err) 808 goto out_release; 809 810 newsk = skb->sk; 811 newsk->sk_socket = newsock; 812 newsk->sk_sleep = &newsock->wait; 813 814 /* Now attach up the new socket */ 815 kfree_skb(skb); 816 sk_acceptq_removed(sk); 817 newsock->sk = newsk; 818 819 out_release: 820 release_sock(sk); 821 822 return err; 823 } 824 825 static int nr_getname(struct socket *sock, struct sockaddr *uaddr, 826 int *uaddr_len, int peer) 827 { 828 struct full_sockaddr_ax25 *sax = (struct full_sockaddr_ax25 *)uaddr; 829 struct sock *sk = sock->sk; 830 struct nr_sock *nr = nr_sk(sk); 831 832 lock_sock(sk); 833 if (peer != 0) { 834 if (sk->sk_state != TCP_ESTABLISHED) { 835 release_sock(sk); 836 return -ENOTCONN; 837 } 838 sax->fsa_ax25.sax25_family = AF_NETROM; 839 sax->fsa_ax25.sax25_ndigis = 1; 840 sax->fsa_ax25.sax25_call = nr->user_addr; 841 sax->fsa_digipeater[0] = nr->dest_addr; 842 *uaddr_len = sizeof(struct full_sockaddr_ax25); 843 } else { 844 sax->fsa_ax25.sax25_family = AF_NETROM; 845 sax->fsa_ax25.sax25_ndigis = 0; 846 sax->fsa_ax25.sax25_call = nr->source_addr; 847 *uaddr_len = sizeof(struct sockaddr_ax25); 848 } 849 release_sock(sk); 850 851 return 0; 852 } 853 854 int nr_rx_frame(struct sk_buff *skb, struct net_device *dev) 855 { 856 struct sock *sk; 857 struct sock *make; 858 struct nr_sock *nr_make; 859 ax25_address *src, *dest, *user; 860 unsigned short circuit_index, circuit_id; 861 unsigned short peer_circuit_index, peer_circuit_id; 862 unsigned short frametype, flags, window, timeout; 863 int ret; 864 865 skb->sk = NULL; /* Initially we don't know who it's for */ 866 867 /* 868 * skb->data points to the netrom frame start 869 */ 870 871 src = (ax25_address *)(skb->data + 0); 872 dest = (ax25_address *)(skb->data + 7); 873 874 circuit_index = skb->data[15]; 875 circuit_id = skb->data[16]; 876 peer_circuit_index = skb->data[17]; 877 peer_circuit_id = skb->data[18]; 878 frametype = skb->data[19] & 0x0F; 879 flags = skb->data[19] & 0xF0; 880 881 /* 882 * Check for an incoming IP over NET/ROM frame. 883 */ 884 if (frametype == NR_PROTOEXT && 885 circuit_index == NR_PROTO_IP && circuit_id == NR_PROTO_IP) { 886 skb_pull(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN); 887 skb_reset_transport_header(skb); 888 889 return nr_rx_ip(skb, dev); 890 } 891 892 /* 893 * Find an existing socket connection, based on circuit ID, if it's 894 * a Connect Request base it on their circuit ID. 895 * 896 * Circuit ID 0/0 is not valid but it could still be a "reset" for a 897 * circuit that no longer exists at the other end ... 898 */ 899 900 sk = NULL; 901 902 if (circuit_index == 0 && circuit_id == 0) { 903 if (frametype == NR_CONNACK && flags == NR_CHOKE_FLAG) 904 sk = nr_find_peer(peer_circuit_index, peer_circuit_id, src); 905 } else { 906 if (frametype == NR_CONNREQ) 907 sk = nr_find_peer(circuit_index, circuit_id, src); 908 else 909 sk = nr_find_socket(circuit_index, circuit_id); 910 } 911 912 if (sk != NULL) { 913 skb_reset_transport_header(skb); 914 915 if (frametype == NR_CONNACK && skb->len == 22) 916 nr_sk(sk)->bpqext = 1; 917 else 918 nr_sk(sk)->bpqext = 0; 919 920 ret = nr_process_rx_frame(sk, skb); 921 bh_unlock_sock(sk); 922 return ret; 923 } 924 925 /* 926 * Now it should be a CONNREQ. 927 */ 928 if (frametype != NR_CONNREQ) { 929 /* 930 * Here it would be nice to be able to send a reset but 931 * NET/ROM doesn't have one. We've tried to extend the protocol 932 * by sending NR_CONNACK | NR_CHOKE_FLAGS replies but that 933 * apparently kills BPQ boxes... :-( 934 * So now we try to follow the established behaviour of 935 * G8PZT's Xrouter which is sending packets with command type 7 936 * as an extension of the protocol. 937 */ 938 if (sysctl_netrom_reset_circuit && 939 (frametype != NR_RESET || flags != 0)) 940 nr_transmit_reset(skb, 1); 941 942 return 0; 943 } 944 945 sk = nr_find_listener(dest); 946 947 user = (ax25_address *)(skb->data + 21); 948 949 if (sk == NULL || sk_acceptq_is_full(sk) || 950 (make = nr_make_new(sk)) == NULL) { 951 nr_transmit_refusal(skb, 0); 952 if (sk) 953 bh_unlock_sock(sk); 954 return 0; 955 } 956 957 window = skb->data[20]; 958 959 skb->sk = make; 960 make->sk_state = TCP_ESTABLISHED; 961 962 /* Fill in his circuit details */ 963 nr_make = nr_sk(make); 964 nr_make->source_addr = *dest; 965 nr_make->dest_addr = *src; 966 nr_make->user_addr = *user; 967 968 nr_make->your_index = circuit_index; 969 nr_make->your_id = circuit_id; 970 971 bh_unlock_sock(sk); 972 circuit = nr_find_next_circuit(); 973 bh_lock_sock(sk); 974 975 nr_make->my_index = circuit / 256; 976 nr_make->my_id = circuit % 256; 977 978 circuit++; 979 980 /* Window negotiation */ 981 if (window < nr_make->window) 982 nr_make->window = window; 983 984 /* L4 timeout negotiation */ 985 if (skb->len == 37) { 986 timeout = skb->data[36] * 256 + skb->data[35]; 987 if (timeout * HZ < nr_make->t1) 988 nr_make->t1 = timeout * HZ; 989 nr_make->bpqext = 1; 990 } else { 991 nr_make->bpqext = 0; 992 } 993 994 nr_write_internal(make, NR_CONNACK); 995 996 nr_make->condition = 0x00; 997 nr_make->vs = 0; 998 nr_make->va = 0; 999 nr_make->vr = 0; 1000 nr_make->vl = 0; 1001 nr_make->state = NR_STATE_3; 1002 sk_acceptq_added(sk); 1003 skb_queue_head(&sk->sk_receive_queue, skb); 1004 1005 if (!sock_flag(sk, SOCK_DEAD)) 1006 sk->sk_data_ready(sk, skb->len); 1007 1008 bh_unlock_sock(sk); 1009 1010 nr_insert_socket(make); 1011 1012 nr_start_heartbeat(make); 1013 nr_start_idletimer(make); 1014 1015 return 1; 1016 } 1017 1018 static int nr_sendmsg(struct kiocb *iocb, struct socket *sock, 1019 struct msghdr *msg, size_t len) 1020 { 1021 struct sock *sk = sock->sk; 1022 struct nr_sock *nr = nr_sk(sk); 1023 struct sockaddr_ax25 *usax = (struct sockaddr_ax25 *)msg->msg_name; 1024 int err; 1025 struct sockaddr_ax25 sax; 1026 struct sk_buff *skb; 1027 unsigned char *asmptr; 1028 int size; 1029 1030 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT)) 1031 return -EINVAL; 1032 1033 lock_sock(sk); 1034 if (sock_flag(sk, SOCK_ZAPPED)) { 1035 err = -EADDRNOTAVAIL; 1036 goto out; 1037 } 1038 1039 if (sk->sk_shutdown & SEND_SHUTDOWN) { 1040 send_sig(SIGPIPE, current, 0); 1041 err = -EPIPE; 1042 goto out; 1043 } 1044 1045 if (nr->device == NULL) { 1046 err = -ENETUNREACH; 1047 goto out; 1048 } 1049 1050 if (usax) { 1051 if (msg->msg_namelen < sizeof(sax)) { 1052 err = -EINVAL; 1053 goto out; 1054 } 1055 sax = *usax; 1056 if (ax25cmp(&nr->dest_addr, &sax.sax25_call) != 0) { 1057 err = -EISCONN; 1058 goto out; 1059 } 1060 if (sax.sax25_family != AF_NETROM) { 1061 err = -EINVAL; 1062 goto out; 1063 } 1064 } else { 1065 if (sk->sk_state != TCP_ESTABLISHED) { 1066 err = -ENOTCONN; 1067 goto out; 1068 } 1069 sax.sax25_family = AF_NETROM; 1070 sax.sax25_call = nr->dest_addr; 1071 } 1072 1073 SOCK_DEBUG(sk, "NET/ROM: sendto: Addresses built.\n"); 1074 1075 /* Build a packet */ 1076 SOCK_DEBUG(sk, "NET/ROM: sendto: building packet.\n"); 1077 size = len + NR_NETWORK_LEN + NR_TRANSPORT_LEN; 1078 1079 if ((skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL) 1080 goto out; 1081 1082 skb_reserve(skb, size - len); 1083 skb_reset_transport_header(skb); 1084 1085 /* 1086 * Push down the NET/ROM header 1087 */ 1088 1089 asmptr = skb_push(skb, NR_TRANSPORT_LEN); 1090 SOCK_DEBUG(sk, "Building NET/ROM Header.\n"); 1091 1092 /* Build a NET/ROM Transport header */ 1093 1094 *asmptr++ = nr->your_index; 1095 *asmptr++ = nr->your_id; 1096 *asmptr++ = 0; /* To be filled in later */ 1097 *asmptr++ = 0; /* Ditto */ 1098 *asmptr++ = NR_INFO; 1099 SOCK_DEBUG(sk, "Built header.\n"); 1100 1101 /* 1102 * Put the data on the end 1103 */ 1104 skb_put(skb, len); 1105 1106 SOCK_DEBUG(sk, "NET/ROM: Appending user data\n"); 1107 1108 /* User data follows immediately after the NET/ROM transport header */ 1109 if (memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len)) { 1110 kfree_skb(skb); 1111 err = -EFAULT; 1112 goto out; 1113 } 1114 1115 SOCK_DEBUG(sk, "NET/ROM: Transmitting buffer\n"); 1116 1117 if (sk->sk_state != TCP_ESTABLISHED) { 1118 kfree_skb(skb); 1119 err = -ENOTCONN; 1120 goto out; 1121 } 1122 1123 nr_output(sk, skb); /* Shove it onto the queue */ 1124 1125 err = len; 1126 out: 1127 release_sock(sk); 1128 return err; 1129 } 1130 1131 static int nr_recvmsg(struct kiocb *iocb, struct socket *sock, 1132 struct msghdr *msg, size_t size, int flags) 1133 { 1134 struct sock *sk = sock->sk; 1135 struct sockaddr_ax25 *sax = (struct sockaddr_ax25 *)msg->msg_name; 1136 size_t copied; 1137 struct sk_buff *skb; 1138 int er; 1139 1140 /* 1141 * This works for seqpacket too. The receiver has ordered the queue for 1142 * us! We do one quick check first though 1143 */ 1144 1145 lock_sock(sk); 1146 if (sk->sk_state != TCP_ESTABLISHED) { 1147 release_sock(sk); 1148 return -ENOTCONN; 1149 } 1150 1151 /* Now we can treat all alike */ 1152 if ((skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, flags & MSG_DONTWAIT, &er)) == NULL) { 1153 release_sock(sk); 1154 return er; 1155 } 1156 1157 skb_reset_transport_header(skb); 1158 copied = skb->len; 1159 1160 if (copied > size) { 1161 copied = size; 1162 msg->msg_flags |= MSG_TRUNC; 1163 } 1164 1165 skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 1166 1167 if (sax != NULL) { 1168 sax->sax25_family = AF_NETROM; 1169 skb_copy_from_linear_data_offset(skb, 7, sax->sax25_call.ax25_call, 1170 AX25_ADDR_LEN); 1171 } 1172 1173 msg->msg_namelen = sizeof(*sax); 1174 1175 skb_free_datagram(sk, skb); 1176 1177 release_sock(sk); 1178 return copied; 1179 } 1180 1181 1182 static int nr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1183 { 1184 struct sock *sk = sock->sk; 1185 void __user *argp = (void __user *)arg; 1186 int ret; 1187 1188 switch (cmd) { 1189 case TIOCOUTQ: { 1190 long amount; 1191 1192 lock_sock(sk); 1193 amount = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc); 1194 if (amount < 0) 1195 amount = 0; 1196 release_sock(sk); 1197 return put_user(amount, (int __user *)argp); 1198 } 1199 1200 case TIOCINQ: { 1201 struct sk_buff *skb; 1202 long amount = 0L; 1203 1204 lock_sock(sk); 1205 /* These two are safe on a single CPU system as only user tasks fiddle here */ 1206 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) 1207 amount = skb->len; 1208 release_sock(sk); 1209 return put_user(amount, (int __user *)argp); 1210 } 1211 1212 case SIOCGSTAMP: 1213 lock_sock(sk); 1214 ret = sock_get_timestamp(sk, argp); 1215 release_sock(sk); 1216 return ret; 1217 1218 case SIOCGSTAMPNS: 1219 lock_sock(sk); 1220 ret = sock_get_timestampns(sk, argp); 1221 release_sock(sk); 1222 return ret; 1223 1224 case SIOCGIFADDR: 1225 case SIOCSIFADDR: 1226 case SIOCGIFDSTADDR: 1227 case SIOCSIFDSTADDR: 1228 case SIOCGIFBRDADDR: 1229 case SIOCSIFBRDADDR: 1230 case SIOCGIFNETMASK: 1231 case SIOCSIFNETMASK: 1232 case SIOCGIFMETRIC: 1233 case SIOCSIFMETRIC: 1234 return -EINVAL; 1235 1236 case SIOCADDRT: 1237 case SIOCDELRT: 1238 case SIOCNRDECOBS: 1239 if (!capable(CAP_NET_ADMIN)) return -EPERM; 1240 return nr_rt_ioctl(cmd, argp); 1241 1242 default: 1243 return -ENOIOCTLCMD; 1244 } 1245 1246 return 0; 1247 } 1248 1249 #ifdef CONFIG_PROC_FS 1250 1251 static void *nr_info_start(struct seq_file *seq, loff_t *pos) 1252 { 1253 struct sock *s; 1254 struct hlist_node *node; 1255 int i = 1; 1256 1257 spin_lock_bh(&nr_list_lock); 1258 if (*pos == 0) 1259 return SEQ_START_TOKEN; 1260 1261 sk_for_each(s, node, &nr_list) { 1262 if (i == *pos) 1263 return s; 1264 ++i; 1265 } 1266 return NULL; 1267 } 1268 1269 static void *nr_info_next(struct seq_file *seq, void *v, loff_t *pos) 1270 { 1271 ++*pos; 1272 1273 return (v == SEQ_START_TOKEN) ? sk_head(&nr_list) 1274 : sk_next((struct sock *)v); 1275 } 1276 1277 static void nr_info_stop(struct seq_file *seq, void *v) 1278 { 1279 spin_unlock_bh(&nr_list_lock); 1280 } 1281 1282 static int nr_info_show(struct seq_file *seq, void *v) 1283 { 1284 struct sock *s = v; 1285 struct net_device *dev; 1286 struct nr_sock *nr; 1287 const char *devname; 1288 char buf[11]; 1289 1290 if (v == SEQ_START_TOKEN) 1291 seq_puts(seq, 1292 "user_addr dest_node src_node dev my your st vs vr va t1 t2 t4 idle n2 wnd Snd-Q Rcv-Q inode\n"); 1293 1294 else { 1295 1296 bh_lock_sock(s); 1297 nr = nr_sk(s); 1298 1299 if ((dev = nr->device) == NULL) 1300 devname = "???"; 1301 else 1302 devname = dev->name; 1303 1304 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->user_addr)); 1305 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->dest_addr)); 1306 seq_printf(seq, 1307 "%-9s %-3s %02X/%02X %02X/%02X %2d %3d %3d %3d %3lu/%03lu %2lu/%02lu %3lu/%03lu %3lu/%03lu %2d/%02d %3d %5d %5d %ld\n", 1308 ax2asc(buf, &nr->source_addr), 1309 devname, 1310 nr->my_index, 1311 nr->my_id, 1312 nr->your_index, 1313 nr->your_id, 1314 nr->state, 1315 nr->vs, 1316 nr->vr, 1317 nr->va, 1318 ax25_display_timer(&nr->t1timer) / HZ, 1319 nr->t1 / HZ, 1320 ax25_display_timer(&nr->t2timer) / HZ, 1321 nr->t2 / HZ, 1322 ax25_display_timer(&nr->t4timer) / HZ, 1323 nr->t4 / HZ, 1324 ax25_display_timer(&nr->idletimer) / (60 * HZ), 1325 nr->idle / (60 * HZ), 1326 nr->n2count, 1327 nr->n2, 1328 nr->window, 1329 atomic_read(&s->sk_wmem_alloc), 1330 atomic_read(&s->sk_rmem_alloc), 1331 s->sk_socket ? SOCK_INODE(s->sk_socket)->i_ino : 0L); 1332 1333 bh_unlock_sock(s); 1334 } 1335 return 0; 1336 } 1337 1338 static const struct seq_operations nr_info_seqops = { 1339 .start = nr_info_start, 1340 .next = nr_info_next, 1341 .stop = nr_info_stop, 1342 .show = nr_info_show, 1343 }; 1344 1345 static int nr_info_open(struct inode *inode, struct file *file) 1346 { 1347 return seq_open(file, &nr_info_seqops); 1348 } 1349 1350 static const struct file_operations nr_info_fops = { 1351 .owner = THIS_MODULE, 1352 .open = nr_info_open, 1353 .read = seq_read, 1354 .llseek = seq_lseek, 1355 .release = seq_release, 1356 }; 1357 #endif /* CONFIG_PROC_FS */ 1358 1359 static struct net_proto_family nr_family_ops = { 1360 .family = PF_NETROM, 1361 .create = nr_create, 1362 .owner = THIS_MODULE, 1363 }; 1364 1365 static const struct proto_ops nr_proto_ops = { 1366 .family = PF_NETROM, 1367 .owner = THIS_MODULE, 1368 .release = nr_release, 1369 .bind = nr_bind, 1370 .connect = nr_connect, 1371 .socketpair = sock_no_socketpair, 1372 .accept = nr_accept, 1373 .getname = nr_getname, 1374 .poll = datagram_poll, 1375 .ioctl = nr_ioctl, 1376 .listen = nr_listen, 1377 .shutdown = sock_no_shutdown, 1378 .setsockopt = nr_setsockopt, 1379 .getsockopt = nr_getsockopt, 1380 .sendmsg = nr_sendmsg, 1381 .recvmsg = nr_recvmsg, 1382 .mmap = sock_no_mmap, 1383 .sendpage = sock_no_sendpage, 1384 }; 1385 1386 static struct notifier_block nr_dev_notifier = { 1387 .notifier_call = nr_device_event, 1388 }; 1389 1390 static struct net_device **dev_nr; 1391 1392 static struct ax25_protocol nr_pid = { 1393 .pid = AX25_P_NETROM, 1394 .func = nr_route_frame 1395 }; 1396 1397 static struct ax25_linkfail nr_linkfail_notifier = { 1398 .func = nr_link_failed, 1399 }; 1400 1401 static int __init nr_proto_init(void) 1402 { 1403 int i; 1404 int rc = proto_register(&nr_proto, 0); 1405 1406 if (rc != 0) 1407 goto out; 1408 1409 if (nr_ndevs > 0x7fffffff/sizeof(struct net_device *)) { 1410 printk(KERN_ERR "NET/ROM: nr_proto_init - nr_ndevs parameter to large\n"); 1411 return -1; 1412 } 1413 1414 dev_nr = kzalloc(nr_ndevs * sizeof(struct net_device *), GFP_KERNEL); 1415 if (dev_nr == NULL) { 1416 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device array\n"); 1417 return -1; 1418 } 1419 1420 for (i = 0; i < nr_ndevs; i++) { 1421 char name[IFNAMSIZ]; 1422 struct net_device *dev; 1423 1424 sprintf(name, "nr%d", i); 1425 dev = alloc_netdev(sizeof(struct nr_private), name, nr_setup); 1426 if (!dev) { 1427 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device structure\n"); 1428 goto fail; 1429 } 1430 1431 dev->base_addr = i; 1432 if (register_netdev(dev)) { 1433 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register network device\n"); 1434 free_netdev(dev); 1435 goto fail; 1436 } 1437 lockdep_set_class(&dev->_xmit_lock, &nr_netdev_xmit_lock_key); 1438 dev_nr[i] = dev; 1439 } 1440 1441 if (sock_register(&nr_family_ops)) { 1442 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register socket family\n"); 1443 goto fail; 1444 } 1445 1446 register_netdevice_notifier(&nr_dev_notifier); 1447 1448 ax25_register_pid(&nr_pid); 1449 ax25_linkfail_register(&nr_linkfail_notifier); 1450 1451 #ifdef CONFIG_SYSCTL 1452 nr_register_sysctl(); 1453 #endif 1454 1455 nr_loopback_init(); 1456 1457 proc_net_fops_create(&init_net, "nr", S_IRUGO, &nr_info_fops); 1458 proc_net_fops_create(&init_net, "nr_neigh", S_IRUGO, &nr_neigh_fops); 1459 proc_net_fops_create(&init_net, "nr_nodes", S_IRUGO, &nr_nodes_fops); 1460 out: 1461 return rc; 1462 fail: 1463 while (--i >= 0) { 1464 unregister_netdev(dev_nr[i]); 1465 free_netdev(dev_nr[i]); 1466 } 1467 kfree(dev_nr); 1468 proto_unregister(&nr_proto); 1469 rc = -1; 1470 goto out; 1471 } 1472 1473 module_init(nr_proto_init); 1474 1475 module_param(nr_ndevs, int, 0); 1476 MODULE_PARM_DESC(nr_ndevs, "number of NET/ROM devices"); 1477 1478 MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>"); 1479 MODULE_DESCRIPTION("The amateur radio NET/ROM network and transport layer protocol"); 1480 MODULE_LICENSE("GPL"); 1481 MODULE_ALIAS_NETPROTO(PF_NETROM); 1482 1483 static void __exit nr_exit(void) 1484 { 1485 int i; 1486 1487 proc_net_remove(&init_net, "nr"); 1488 proc_net_remove(&init_net, "nr_neigh"); 1489 proc_net_remove(&init_net, "nr_nodes"); 1490 nr_loopback_clear(); 1491 1492 nr_rt_free(); 1493 1494 #ifdef CONFIG_SYSCTL 1495 nr_unregister_sysctl(); 1496 #endif 1497 1498 ax25_linkfail_release(&nr_linkfail_notifier); 1499 ax25_protocol_release(AX25_P_NETROM); 1500 1501 unregister_netdevice_notifier(&nr_dev_notifier); 1502 1503 sock_unregister(PF_NETROM); 1504 1505 for (i = 0; i < nr_ndevs; i++) { 1506 struct net_device *dev = dev_nr[i]; 1507 if (dev) { 1508 unregister_netdev(dev); 1509 free_netdev(dev); 1510 } 1511 } 1512 1513 kfree(dev_nr); 1514 proto_unregister(&nr_proto); 1515 } 1516 module_exit(nr_exit); 1517