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