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 sk = sk_alloc(net, PF_NETROM, GFP_ATOMIC, &nr_proto); 427 if (sk == NULL) 428 return -ENOMEM; 429 430 nr = nr_sk(sk); 431 432 sock_init_data(sock, sk); 433 434 sock->ops = &nr_proto_ops; 435 sk->sk_protocol = protocol; 436 437 skb_queue_head_init(&nr->ack_queue); 438 skb_queue_head_init(&nr->reseq_queue); 439 skb_queue_head_init(&nr->frag_queue); 440 441 nr_init_timers(sk); 442 443 nr->t1 = 444 msecs_to_jiffies(sysctl_netrom_transport_timeout); 445 nr->t2 = 446 msecs_to_jiffies(sysctl_netrom_transport_acknowledge_delay); 447 nr->n2 = 448 msecs_to_jiffies(sysctl_netrom_transport_maximum_tries); 449 nr->t4 = 450 msecs_to_jiffies(sysctl_netrom_transport_busy_delay); 451 nr->idle = 452 msecs_to_jiffies(sysctl_netrom_transport_no_activity_timeout); 453 nr->window = sysctl_netrom_transport_requested_window_size; 454 455 nr->bpqext = 1; 456 nr->state = NR_STATE_0; 457 458 return 0; 459 } 460 461 static struct sock *nr_make_new(struct sock *osk) 462 { 463 struct sock *sk; 464 struct nr_sock *nr, *onr; 465 466 if (osk->sk_type != SOCK_SEQPACKET) 467 return NULL; 468 469 sk = sk_alloc(osk->sk_net, PF_NETROM, GFP_ATOMIC, osk->sk_prot); 470 if (sk == NULL) 471 return NULL; 472 473 nr = nr_sk(sk); 474 475 sock_init_data(NULL, sk); 476 477 sk->sk_type = osk->sk_type; 478 sk->sk_socket = osk->sk_socket; 479 sk->sk_priority = osk->sk_priority; 480 sk->sk_protocol = osk->sk_protocol; 481 sk->sk_rcvbuf = osk->sk_rcvbuf; 482 sk->sk_sndbuf = osk->sk_sndbuf; 483 sk->sk_state = TCP_ESTABLISHED; 484 sk->sk_sleep = osk->sk_sleep; 485 sock_copy_flags(sk, osk); 486 487 skb_queue_head_init(&nr->ack_queue); 488 skb_queue_head_init(&nr->reseq_queue); 489 skb_queue_head_init(&nr->frag_queue); 490 491 nr_init_timers(sk); 492 493 onr = nr_sk(osk); 494 495 nr->t1 = onr->t1; 496 nr->t2 = onr->t2; 497 nr->n2 = onr->n2; 498 nr->t4 = onr->t4; 499 nr->idle = onr->idle; 500 nr->window = onr->window; 501 502 nr->device = onr->device; 503 nr->bpqext = onr->bpqext; 504 505 return sk; 506 } 507 508 static int nr_release(struct socket *sock) 509 { 510 struct sock *sk = sock->sk; 511 struct nr_sock *nr; 512 513 if (sk == NULL) return 0; 514 515 sock_hold(sk); 516 lock_sock(sk); 517 nr = nr_sk(sk); 518 519 switch (nr->state) { 520 case NR_STATE_0: 521 case NR_STATE_1: 522 case NR_STATE_2: 523 nr_disconnect(sk, 0); 524 nr_destroy_socket(sk); 525 break; 526 527 case NR_STATE_3: 528 nr_clear_queues(sk); 529 nr->n2count = 0; 530 nr_write_internal(sk, NR_DISCREQ); 531 nr_start_t1timer(sk); 532 nr_stop_t2timer(sk); 533 nr_stop_t4timer(sk); 534 nr_stop_idletimer(sk); 535 nr->state = NR_STATE_2; 536 sk->sk_state = TCP_CLOSE; 537 sk->sk_shutdown |= SEND_SHUTDOWN; 538 sk->sk_state_change(sk); 539 sock_orphan(sk); 540 sock_set_flag(sk, SOCK_DESTROY); 541 sk->sk_socket = NULL; 542 break; 543 544 default: 545 sk->sk_socket = NULL; 546 break; 547 } 548 549 sock->sk = NULL; 550 release_sock(sk); 551 sock_put(sk); 552 553 return 0; 554 } 555 556 static int nr_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 557 { 558 struct sock *sk = sock->sk; 559 struct nr_sock *nr = nr_sk(sk); 560 struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr; 561 struct net_device *dev; 562 ax25_uid_assoc *user; 563 ax25_address *source; 564 565 lock_sock(sk); 566 if (!sock_flag(sk, SOCK_ZAPPED)) { 567 release_sock(sk); 568 return -EINVAL; 569 } 570 if (addr_len < sizeof(struct sockaddr_ax25) || addr_len > sizeof(struct full_sockaddr_ax25)) { 571 release_sock(sk); 572 return -EINVAL; 573 } 574 if (addr_len < (addr->fsa_ax25.sax25_ndigis * sizeof(ax25_address) + sizeof(struct sockaddr_ax25))) { 575 release_sock(sk); 576 return -EINVAL; 577 } 578 if (addr->fsa_ax25.sax25_family != AF_NETROM) { 579 release_sock(sk); 580 return -EINVAL; 581 } 582 if ((dev = nr_dev_get(&addr->fsa_ax25.sax25_call)) == NULL) { 583 SOCK_DEBUG(sk, "NET/ROM: bind failed: invalid node callsign\n"); 584 release_sock(sk); 585 return -EADDRNOTAVAIL; 586 } 587 588 /* 589 * Only the super user can set an arbitrary user callsign. 590 */ 591 if (addr->fsa_ax25.sax25_ndigis == 1) { 592 if (!capable(CAP_NET_BIND_SERVICE)) { 593 dev_put(dev); 594 release_sock(sk); 595 return -EACCES; 596 } 597 nr->user_addr = addr->fsa_digipeater[0]; 598 nr->source_addr = addr->fsa_ax25.sax25_call; 599 } else { 600 source = &addr->fsa_ax25.sax25_call; 601 602 user = ax25_findbyuid(current->euid); 603 if (user) { 604 nr->user_addr = user->call; 605 ax25_uid_put(user); 606 } else { 607 if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) { 608 release_sock(sk); 609 dev_put(dev); 610 return -EPERM; 611 } 612 nr->user_addr = *source; 613 } 614 615 nr->source_addr = *source; 616 } 617 618 nr->device = dev; 619 nr_insert_socket(sk); 620 621 sock_reset_flag(sk, SOCK_ZAPPED); 622 dev_put(dev); 623 release_sock(sk); 624 SOCK_DEBUG(sk, "NET/ROM: socket is bound\n"); 625 return 0; 626 } 627 628 static int nr_connect(struct socket *sock, struct sockaddr *uaddr, 629 int addr_len, int flags) 630 { 631 struct sock *sk = sock->sk; 632 struct nr_sock *nr = nr_sk(sk); 633 struct sockaddr_ax25 *addr = (struct sockaddr_ax25 *)uaddr; 634 ax25_address *source = NULL; 635 ax25_uid_assoc *user; 636 struct net_device *dev; 637 int err = 0; 638 639 lock_sock(sk); 640 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) { 641 sock->state = SS_CONNECTED; 642 goto out_release; /* Connect completed during a ERESTARTSYS event */ 643 } 644 645 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) { 646 sock->state = SS_UNCONNECTED; 647 err = -ECONNREFUSED; 648 goto out_release; 649 } 650 651 if (sk->sk_state == TCP_ESTABLISHED) { 652 err = -EISCONN; /* No reconnect on a seqpacket socket */ 653 goto out_release; 654 } 655 656 sk->sk_state = TCP_CLOSE; 657 sock->state = SS_UNCONNECTED; 658 659 if (addr_len != sizeof(struct sockaddr_ax25) && addr_len != sizeof(struct full_sockaddr_ax25)) { 660 err = -EINVAL; 661 goto out_release; 662 } 663 if (addr->sax25_family != AF_NETROM) { 664 err = -EINVAL; 665 goto out_release; 666 } 667 if (sock_flag(sk, SOCK_ZAPPED)) { /* Must bind first - autobinding in this may or may not work */ 668 sock_reset_flag(sk, SOCK_ZAPPED); 669 670 if ((dev = nr_dev_first()) == NULL) { 671 err = -ENETUNREACH; 672 goto out_release; 673 } 674 source = (ax25_address *)dev->dev_addr; 675 676 user = ax25_findbyuid(current->euid); 677 if (user) { 678 nr->user_addr = user->call; 679 ax25_uid_put(user); 680 } else { 681 if (ax25_uid_policy && !capable(CAP_NET_ADMIN)) { 682 dev_put(dev); 683 err = -EPERM; 684 goto out_release; 685 } 686 nr->user_addr = *source; 687 } 688 689 nr->source_addr = *source; 690 nr->device = dev; 691 692 dev_put(dev); 693 nr_insert_socket(sk); /* Finish the bind */ 694 } 695 696 nr->dest_addr = addr->sax25_call; 697 698 release_sock(sk); 699 circuit = nr_find_next_circuit(); 700 lock_sock(sk); 701 702 nr->my_index = circuit / 256; 703 nr->my_id = circuit % 256; 704 705 circuit++; 706 707 /* Move to connecting socket, start sending Connect Requests */ 708 sock->state = SS_CONNECTING; 709 sk->sk_state = TCP_SYN_SENT; 710 711 nr_establish_data_link(sk); 712 713 nr->state = NR_STATE_1; 714 715 nr_start_heartbeat(sk); 716 717 /* Now the loop */ 718 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) { 719 err = -EINPROGRESS; 720 goto out_release; 721 } 722 723 /* 724 * A Connect Ack with Choke or timeout or failed routing will go to 725 * closed. 726 */ 727 if (sk->sk_state == TCP_SYN_SENT) { 728 DEFINE_WAIT(wait); 729 730 for (;;) { 731 prepare_to_wait(sk->sk_sleep, &wait, 732 TASK_INTERRUPTIBLE); 733 if (sk->sk_state != TCP_SYN_SENT) 734 break; 735 if (!signal_pending(current)) { 736 release_sock(sk); 737 schedule(); 738 lock_sock(sk); 739 continue; 740 } 741 err = -ERESTARTSYS; 742 break; 743 } 744 finish_wait(sk->sk_sleep, &wait); 745 if (err) 746 goto out_release; 747 } 748 749 if (sk->sk_state != TCP_ESTABLISHED) { 750 sock->state = SS_UNCONNECTED; 751 err = sock_error(sk); /* Always set at this point */ 752 goto out_release; 753 } 754 755 sock->state = SS_CONNECTED; 756 757 out_release: 758 release_sock(sk); 759 760 return err; 761 } 762 763 static int nr_accept(struct socket *sock, struct socket *newsock, int flags) 764 { 765 struct sk_buff *skb; 766 struct sock *newsk; 767 DEFINE_WAIT(wait); 768 struct sock *sk; 769 int err = 0; 770 771 if ((sk = sock->sk) == NULL) 772 return -EINVAL; 773 774 lock_sock(sk); 775 if (sk->sk_type != SOCK_SEQPACKET) { 776 err = -EOPNOTSUPP; 777 goto out_release; 778 } 779 780 if (sk->sk_state != TCP_LISTEN) { 781 err = -EINVAL; 782 goto out_release; 783 } 784 785 /* 786 * The write queue this time is holding sockets ready to use 787 * hooked into the SABM we saved 788 */ 789 for (;;) { 790 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 791 skb = skb_dequeue(&sk->sk_receive_queue); 792 if (skb) 793 break; 794 795 if (flags & O_NONBLOCK) { 796 err = -EWOULDBLOCK; 797 break; 798 } 799 if (!signal_pending(current)) { 800 release_sock(sk); 801 schedule(); 802 lock_sock(sk); 803 continue; 804 } 805 err = -ERESTARTSYS; 806 break; 807 } 808 finish_wait(sk->sk_sleep, &wait); 809 if (err) 810 goto out_release; 811 812 newsk = skb->sk; 813 newsk->sk_socket = newsock; 814 newsk->sk_sleep = &newsock->wait; 815 816 /* Now attach up the new socket */ 817 kfree_skb(skb); 818 sk_acceptq_removed(sk); 819 newsock->sk = newsk; 820 821 out_release: 822 release_sock(sk); 823 824 return err; 825 } 826 827 static int nr_getname(struct socket *sock, struct sockaddr *uaddr, 828 int *uaddr_len, int peer) 829 { 830 struct full_sockaddr_ax25 *sax = (struct full_sockaddr_ax25 *)uaddr; 831 struct sock *sk = sock->sk; 832 struct nr_sock *nr = nr_sk(sk); 833 834 lock_sock(sk); 835 if (peer != 0) { 836 if (sk->sk_state != TCP_ESTABLISHED) { 837 release_sock(sk); 838 return -ENOTCONN; 839 } 840 sax->fsa_ax25.sax25_family = AF_NETROM; 841 sax->fsa_ax25.sax25_ndigis = 1; 842 sax->fsa_ax25.sax25_call = nr->user_addr; 843 sax->fsa_digipeater[0] = nr->dest_addr; 844 *uaddr_len = sizeof(struct full_sockaddr_ax25); 845 } else { 846 sax->fsa_ax25.sax25_family = AF_NETROM; 847 sax->fsa_ax25.sax25_ndigis = 0; 848 sax->fsa_ax25.sax25_call = nr->source_addr; 849 *uaddr_len = sizeof(struct sockaddr_ax25); 850 } 851 release_sock(sk); 852 853 return 0; 854 } 855 856 int nr_rx_frame(struct sk_buff *skb, struct net_device *dev) 857 { 858 struct sock *sk; 859 struct sock *make; 860 struct nr_sock *nr_make; 861 ax25_address *src, *dest, *user; 862 unsigned short circuit_index, circuit_id; 863 unsigned short peer_circuit_index, peer_circuit_id; 864 unsigned short frametype, flags, window, timeout; 865 int ret; 866 867 skb->sk = NULL; /* Initially we don't know who it's for */ 868 869 /* 870 * skb->data points to the netrom frame start 871 */ 872 873 src = (ax25_address *)(skb->data + 0); 874 dest = (ax25_address *)(skb->data + 7); 875 876 circuit_index = skb->data[15]; 877 circuit_id = skb->data[16]; 878 peer_circuit_index = skb->data[17]; 879 peer_circuit_id = skb->data[18]; 880 frametype = skb->data[19] & 0x0F; 881 flags = skb->data[19] & 0xF0; 882 883 /* 884 * Check for an incoming IP over NET/ROM frame. 885 */ 886 if (frametype == NR_PROTOEXT && 887 circuit_index == NR_PROTO_IP && circuit_id == NR_PROTO_IP) { 888 skb_pull(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN); 889 skb_reset_transport_header(skb); 890 891 return nr_rx_ip(skb, dev); 892 } 893 894 /* 895 * Find an existing socket connection, based on circuit ID, if it's 896 * a Connect Request base it on their circuit ID. 897 * 898 * Circuit ID 0/0 is not valid but it could still be a "reset" for a 899 * circuit that no longer exists at the other end ... 900 */ 901 902 sk = NULL; 903 904 if (circuit_index == 0 && circuit_id == 0) { 905 if (frametype == NR_CONNACK && flags == NR_CHOKE_FLAG) 906 sk = nr_find_peer(peer_circuit_index, peer_circuit_id, src); 907 } else { 908 if (frametype == NR_CONNREQ) 909 sk = nr_find_peer(circuit_index, circuit_id, src); 910 else 911 sk = nr_find_socket(circuit_index, circuit_id); 912 } 913 914 if (sk != NULL) { 915 skb_reset_transport_header(skb); 916 917 if (frametype == NR_CONNACK && skb->len == 22) 918 nr_sk(sk)->bpqext = 1; 919 else 920 nr_sk(sk)->bpqext = 0; 921 922 ret = nr_process_rx_frame(sk, skb); 923 bh_unlock_sock(sk); 924 return ret; 925 } 926 927 /* 928 * Now it should be a CONNREQ. 929 */ 930 if (frametype != NR_CONNREQ) { 931 /* 932 * Here it would be nice to be able to send a reset but 933 * NET/ROM doesn't have one. We've tried to extend the protocol 934 * by sending NR_CONNACK | NR_CHOKE_FLAGS replies but that 935 * apparently kills BPQ boxes... :-( 936 * So now we try to follow the established behaviour of 937 * G8PZT's Xrouter which is sending packets with command type 7 938 * as an extension of the protocol. 939 */ 940 if (sysctl_netrom_reset_circuit && 941 (frametype != NR_RESET || flags != 0)) 942 nr_transmit_reset(skb, 1); 943 944 return 0; 945 } 946 947 sk = nr_find_listener(dest); 948 949 user = (ax25_address *)(skb->data + 21); 950 951 if (sk == NULL || sk_acceptq_is_full(sk) || 952 (make = nr_make_new(sk)) == NULL) { 953 nr_transmit_refusal(skb, 0); 954 if (sk) 955 bh_unlock_sock(sk); 956 return 0; 957 } 958 959 window = skb->data[20]; 960 961 skb->sk = make; 962 make->sk_state = TCP_ESTABLISHED; 963 964 /* Fill in his circuit details */ 965 nr_make = nr_sk(make); 966 nr_make->source_addr = *dest; 967 nr_make->dest_addr = *src; 968 nr_make->user_addr = *user; 969 970 nr_make->your_index = circuit_index; 971 nr_make->your_id = circuit_id; 972 973 bh_unlock_sock(sk); 974 circuit = nr_find_next_circuit(); 975 bh_lock_sock(sk); 976 977 nr_make->my_index = circuit / 256; 978 nr_make->my_id = circuit % 256; 979 980 circuit++; 981 982 /* Window negotiation */ 983 if (window < nr_make->window) 984 nr_make->window = window; 985 986 /* L4 timeout negotiation */ 987 if (skb->len == 37) { 988 timeout = skb->data[36] * 256 + skb->data[35]; 989 if (timeout * HZ < nr_make->t1) 990 nr_make->t1 = timeout * HZ; 991 nr_make->bpqext = 1; 992 } else { 993 nr_make->bpqext = 0; 994 } 995 996 nr_write_internal(make, NR_CONNACK); 997 998 nr_make->condition = 0x00; 999 nr_make->vs = 0; 1000 nr_make->va = 0; 1001 nr_make->vr = 0; 1002 nr_make->vl = 0; 1003 nr_make->state = NR_STATE_3; 1004 sk_acceptq_added(sk); 1005 skb_queue_head(&sk->sk_receive_queue, skb); 1006 1007 if (!sock_flag(sk, SOCK_DEAD)) 1008 sk->sk_data_ready(sk, skb->len); 1009 1010 bh_unlock_sock(sk); 1011 1012 nr_insert_socket(make); 1013 1014 nr_start_heartbeat(make); 1015 nr_start_idletimer(make); 1016 1017 return 1; 1018 } 1019 1020 static int nr_sendmsg(struct kiocb *iocb, struct socket *sock, 1021 struct msghdr *msg, size_t len) 1022 { 1023 struct sock *sk = sock->sk; 1024 struct nr_sock *nr = nr_sk(sk); 1025 struct sockaddr_ax25 *usax = (struct sockaddr_ax25 *)msg->msg_name; 1026 int err; 1027 struct sockaddr_ax25 sax; 1028 struct sk_buff *skb; 1029 unsigned char *asmptr; 1030 int size; 1031 1032 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT)) 1033 return -EINVAL; 1034 1035 lock_sock(sk); 1036 if (sock_flag(sk, SOCK_ZAPPED)) { 1037 err = -EADDRNOTAVAIL; 1038 goto out; 1039 } 1040 1041 if (sk->sk_shutdown & SEND_SHUTDOWN) { 1042 send_sig(SIGPIPE, current, 0); 1043 err = -EPIPE; 1044 goto out; 1045 } 1046 1047 if (nr->device == NULL) { 1048 err = -ENETUNREACH; 1049 goto out; 1050 } 1051 1052 if (usax) { 1053 if (msg->msg_namelen < sizeof(sax)) { 1054 err = -EINVAL; 1055 goto out; 1056 } 1057 sax = *usax; 1058 if (ax25cmp(&nr->dest_addr, &sax.sax25_call) != 0) { 1059 err = -EISCONN; 1060 goto out; 1061 } 1062 if (sax.sax25_family != AF_NETROM) { 1063 err = -EINVAL; 1064 goto out; 1065 } 1066 } else { 1067 if (sk->sk_state != TCP_ESTABLISHED) { 1068 err = -ENOTCONN; 1069 goto out; 1070 } 1071 sax.sax25_family = AF_NETROM; 1072 sax.sax25_call = nr->dest_addr; 1073 } 1074 1075 SOCK_DEBUG(sk, "NET/ROM: sendto: Addresses built.\n"); 1076 1077 /* Build a packet */ 1078 SOCK_DEBUG(sk, "NET/ROM: sendto: building packet.\n"); 1079 size = len + NR_NETWORK_LEN + NR_TRANSPORT_LEN; 1080 1081 if ((skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL) 1082 goto out; 1083 1084 skb_reserve(skb, size - len); 1085 skb_reset_transport_header(skb); 1086 1087 /* 1088 * Push down the NET/ROM header 1089 */ 1090 1091 asmptr = skb_push(skb, NR_TRANSPORT_LEN); 1092 SOCK_DEBUG(sk, "Building NET/ROM Header.\n"); 1093 1094 /* Build a NET/ROM Transport header */ 1095 1096 *asmptr++ = nr->your_index; 1097 *asmptr++ = nr->your_id; 1098 *asmptr++ = 0; /* To be filled in later */ 1099 *asmptr++ = 0; /* Ditto */ 1100 *asmptr++ = NR_INFO; 1101 SOCK_DEBUG(sk, "Built header.\n"); 1102 1103 /* 1104 * Put the data on the end 1105 */ 1106 skb_put(skb, len); 1107 1108 SOCK_DEBUG(sk, "NET/ROM: Appending user data\n"); 1109 1110 /* User data follows immediately after the NET/ROM transport header */ 1111 if (memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len)) { 1112 kfree_skb(skb); 1113 err = -EFAULT; 1114 goto out; 1115 } 1116 1117 SOCK_DEBUG(sk, "NET/ROM: Transmitting buffer\n"); 1118 1119 if (sk->sk_state != TCP_ESTABLISHED) { 1120 kfree_skb(skb); 1121 err = -ENOTCONN; 1122 goto out; 1123 } 1124 1125 nr_output(sk, skb); /* Shove it onto the queue */ 1126 1127 err = len; 1128 out: 1129 release_sock(sk); 1130 return err; 1131 } 1132 1133 static int nr_recvmsg(struct kiocb *iocb, struct socket *sock, 1134 struct msghdr *msg, size_t size, int flags) 1135 { 1136 struct sock *sk = sock->sk; 1137 struct sockaddr_ax25 *sax = (struct sockaddr_ax25 *)msg->msg_name; 1138 size_t copied; 1139 struct sk_buff *skb; 1140 int er; 1141 1142 /* 1143 * This works for seqpacket too. The receiver has ordered the queue for 1144 * us! We do one quick check first though 1145 */ 1146 1147 lock_sock(sk); 1148 if (sk->sk_state != TCP_ESTABLISHED) { 1149 release_sock(sk); 1150 return -ENOTCONN; 1151 } 1152 1153 /* Now we can treat all alike */ 1154 if ((skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, flags & MSG_DONTWAIT, &er)) == NULL) { 1155 release_sock(sk); 1156 return er; 1157 } 1158 1159 skb_reset_transport_header(skb); 1160 copied = skb->len; 1161 1162 if (copied > size) { 1163 copied = size; 1164 msg->msg_flags |= MSG_TRUNC; 1165 } 1166 1167 skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 1168 1169 if (sax != NULL) { 1170 sax->sax25_family = AF_NETROM; 1171 skb_copy_from_linear_data_offset(skb, 7, sax->sax25_call.ax25_call, 1172 AX25_ADDR_LEN); 1173 } 1174 1175 msg->msg_namelen = sizeof(*sax); 1176 1177 skb_free_datagram(sk, skb); 1178 1179 release_sock(sk); 1180 return copied; 1181 } 1182 1183 1184 static int nr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1185 { 1186 struct sock *sk = sock->sk; 1187 void __user *argp = (void __user *)arg; 1188 int ret; 1189 1190 switch (cmd) { 1191 case TIOCOUTQ: { 1192 long amount; 1193 1194 lock_sock(sk); 1195 amount = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc); 1196 if (amount < 0) 1197 amount = 0; 1198 release_sock(sk); 1199 return put_user(amount, (int __user *)argp); 1200 } 1201 1202 case TIOCINQ: { 1203 struct sk_buff *skb; 1204 long amount = 0L; 1205 1206 lock_sock(sk); 1207 /* These two are safe on a single CPU system as only user tasks fiddle here */ 1208 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) 1209 amount = skb->len; 1210 release_sock(sk); 1211 return put_user(amount, (int __user *)argp); 1212 } 1213 1214 case SIOCGSTAMP: 1215 lock_sock(sk); 1216 ret = sock_get_timestamp(sk, argp); 1217 release_sock(sk); 1218 return ret; 1219 1220 case SIOCGSTAMPNS: 1221 lock_sock(sk); 1222 ret = sock_get_timestampns(sk, argp); 1223 release_sock(sk); 1224 return ret; 1225 1226 case SIOCGIFADDR: 1227 case SIOCSIFADDR: 1228 case SIOCGIFDSTADDR: 1229 case SIOCSIFDSTADDR: 1230 case SIOCGIFBRDADDR: 1231 case SIOCSIFBRDADDR: 1232 case SIOCGIFNETMASK: 1233 case SIOCSIFNETMASK: 1234 case SIOCGIFMETRIC: 1235 case SIOCSIFMETRIC: 1236 return -EINVAL; 1237 1238 case SIOCADDRT: 1239 case SIOCDELRT: 1240 case SIOCNRDECOBS: 1241 if (!capable(CAP_NET_ADMIN)) return -EPERM; 1242 return nr_rt_ioctl(cmd, argp); 1243 1244 default: 1245 return -ENOIOCTLCMD; 1246 } 1247 1248 return 0; 1249 } 1250 1251 #ifdef CONFIG_PROC_FS 1252 1253 static void *nr_info_start(struct seq_file *seq, loff_t *pos) 1254 { 1255 struct sock *s; 1256 struct hlist_node *node; 1257 int i = 1; 1258 1259 spin_lock_bh(&nr_list_lock); 1260 if (*pos == 0) 1261 return SEQ_START_TOKEN; 1262 1263 sk_for_each(s, node, &nr_list) { 1264 if (i == *pos) 1265 return s; 1266 ++i; 1267 } 1268 return NULL; 1269 } 1270 1271 static void *nr_info_next(struct seq_file *seq, void *v, loff_t *pos) 1272 { 1273 ++*pos; 1274 1275 return (v == SEQ_START_TOKEN) ? sk_head(&nr_list) 1276 : sk_next((struct sock *)v); 1277 } 1278 1279 static void nr_info_stop(struct seq_file *seq, void *v) 1280 { 1281 spin_unlock_bh(&nr_list_lock); 1282 } 1283 1284 static int nr_info_show(struct seq_file *seq, void *v) 1285 { 1286 struct sock *s = v; 1287 struct net_device *dev; 1288 struct nr_sock *nr; 1289 const char *devname; 1290 char buf[11]; 1291 1292 if (v == SEQ_START_TOKEN) 1293 seq_puts(seq, 1294 "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"); 1295 1296 else { 1297 1298 bh_lock_sock(s); 1299 nr = nr_sk(s); 1300 1301 if ((dev = nr->device) == NULL) 1302 devname = "???"; 1303 else 1304 devname = dev->name; 1305 1306 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->user_addr)); 1307 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->dest_addr)); 1308 seq_printf(seq, 1309 "%-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", 1310 ax2asc(buf, &nr->source_addr), 1311 devname, 1312 nr->my_index, 1313 nr->my_id, 1314 nr->your_index, 1315 nr->your_id, 1316 nr->state, 1317 nr->vs, 1318 nr->vr, 1319 nr->va, 1320 ax25_display_timer(&nr->t1timer) / HZ, 1321 nr->t1 / HZ, 1322 ax25_display_timer(&nr->t2timer) / HZ, 1323 nr->t2 / HZ, 1324 ax25_display_timer(&nr->t4timer) / HZ, 1325 nr->t4 / HZ, 1326 ax25_display_timer(&nr->idletimer) / (60 * HZ), 1327 nr->idle / (60 * HZ), 1328 nr->n2count, 1329 nr->n2, 1330 nr->window, 1331 atomic_read(&s->sk_wmem_alloc), 1332 atomic_read(&s->sk_rmem_alloc), 1333 s->sk_socket ? SOCK_INODE(s->sk_socket)->i_ino : 0L); 1334 1335 bh_unlock_sock(s); 1336 } 1337 return 0; 1338 } 1339 1340 static const struct seq_operations nr_info_seqops = { 1341 .start = nr_info_start, 1342 .next = nr_info_next, 1343 .stop = nr_info_stop, 1344 .show = nr_info_show, 1345 }; 1346 1347 static int nr_info_open(struct inode *inode, struct file *file) 1348 { 1349 return seq_open(file, &nr_info_seqops); 1350 } 1351 1352 static const struct file_operations nr_info_fops = { 1353 .owner = THIS_MODULE, 1354 .open = nr_info_open, 1355 .read = seq_read, 1356 .llseek = seq_lseek, 1357 .release = seq_release, 1358 }; 1359 #endif /* CONFIG_PROC_FS */ 1360 1361 static struct net_proto_family nr_family_ops = { 1362 .family = PF_NETROM, 1363 .create = nr_create, 1364 .owner = THIS_MODULE, 1365 }; 1366 1367 static const struct proto_ops nr_proto_ops = { 1368 .family = PF_NETROM, 1369 .owner = THIS_MODULE, 1370 .release = nr_release, 1371 .bind = nr_bind, 1372 .connect = nr_connect, 1373 .socketpair = sock_no_socketpair, 1374 .accept = nr_accept, 1375 .getname = nr_getname, 1376 .poll = datagram_poll, 1377 .ioctl = nr_ioctl, 1378 .listen = nr_listen, 1379 .shutdown = sock_no_shutdown, 1380 .setsockopt = nr_setsockopt, 1381 .getsockopt = nr_getsockopt, 1382 .sendmsg = nr_sendmsg, 1383 .recvmsg = nr_recvmsg, 1384 .mmap = sock_no_mmap, 1385 .sendpage = sock_no_sendpage, 1386 }; 1387 1388 static struct notifier_block nr_dev_notifier = { 1389 .notifier_call = nr_device_event, 1390 }; 1391 1392 static struct net_device **dev_nr; 1393 1394 static struct ax25_protocol nr_pid = { 1395 .pid = AX25_P_NETROM, 1396 .func = nr_route_frame 1397 }; 1398 1399 static struct ax25_linkfail nr_linkfail_notifier = { 1400 .func = nr_link_failed, 1401 }; 1402 1403 static int __init nr_proto_init(void) 1404 { 1405 int i; 1406 int rc = proto_register(&nr_proto, 0); 1407 1408 if (rc != 0) 1409 goto out; 1410 1411 if (nr_ndevs > 0x7fffffff/sizeof(struct net_device *)) { 1412 printk(KERN_ERR "NET/ROM: nr_proto_init - nr_ndevs parameter to large\n"); 1413 return -1; 1414 } 1415 1416 dev_nr = kzalloc(nr_ndevs * sizeof(struct net_device *), GFP_KERNEL); 1417 if (dev_nr == NULL) { 1418 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device array\n"); 1419 return -1; 1420 } 1421 1422 for (i = 0; i < nr_ndevs; i++) { 1423 char name[IFNAMSIZ]; 1424 struct net_device *dev; 1425 1426 sprintf(name, "nr%d", i); 1427 dev = alloc_netdev(sizeof(struct nr_private), name, nr_setup); 1428 if (!dev) { 1429 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device structure\n"); 1430 goto fail; 1431 } 1432 1433 dev->base_addr = i; 1434 if (register_netdev(dev)) { 1435 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register network device\n"); 1436 free_netdev(dev); 1437 goto fail; 1438 } 1439 lockdep_set_class(&dev->_xmit_lock, &nr_netdev_xmit_lock_key); 1440 dev_nr[i] = dev; 1441 } 1442 1443 if (sock_register(&nr_family_ops)) { 1444 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register socket family\n"); 1445 goto fail; 1446 } 1447 1448 register_netdevice_notifier(&nr_dev_notifier); 1449 1450 ax25_register_pid(&nr_pid); 1451 ax25_linkfail_register(&nr_linkfail_notifier); 1452 1453 #ifdef CONFIG_SYSCTL 1454 nr_register_sysctl(); 1455 #endif 1456 1457 nr_loopback_init(); 1458 1459 proc_net_fops_create(&init_net, "nr", S_IRUGO, &nr_info_fops); 1460 proc_net_fops_create(&init_net, "nr_neigh", S_IRUGO, &nr_neigh_fops); 1461 proc_net_fops_create(&init_net, "nr_nodes", S_IRUGO, &nr_nodes_fops); 1462 out: 1463 return rc; 1464 fail: 1465 while (--i >= 0) { 1466 unregister_netdev(dev_nr[i]); 1467 free_netdev(dev_nr[i]); 1468 } 1469 kfree(dev_nr); 1470 proto_unregister(&nr_proto); 1471 rc = -1; 1472 goto out; 1473 } 1474 1475 module_init(nr_proto_init); 1476 1477 module_param(nr_ndevs, int, 0); 1478 MODULE_PARM_DESC(nr_ndevs, "number of NET/ROM devices"); 1479 1480 MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>"); 1481 MODULE_DESCRIPTION("The amateur radio NET/ROM network and transport layer protocol"); 1482 MODULE_LICENSE("GPL"); 1483 MODULE_ALIAS_NETPROTO(PF_NETROM); 1484 1485 static void __exit nr_exit(void) 1486 { 1487 int i; 1488 1489 proc_net_remove(&init_net, "nr"); 1490 proc_net_remove(&init_net, "nr_neigh"); 1491 proc_net_remove(&init_net, "nr_nodes"); 1492 nr_loopback_clear(); 1493 1494 nr_rt_free(); 1495 1496 #ifdef CONFIG_SYSCTL 1497 nr_unregister_sysctl(); 1498 #endif 1499 1500 ax25_linkfail_release(&nr_linkfail_notifier); 1501 ax25_protocol_release(AX25_P_NETROM); 1502 1503 unregister_netdevice_notifier(&nr_dev_notifier); 1504 1505 sock_unregister(PF_NETROM); 1506 1507 for (i = 0; i < nr_ndevs; i++) { 1508 struct net_device *dev = dev_nr[i]; 1509 if (dev) { 1510 unregister_netdev(dev); 1511 free_netdev(dev); 1512 } 1513 } 1514 1515 kfree(dev_nr); 1516 proto_unregister(&nr_proto); 1517 } 1518 module_exit(nr_exit); 1519