1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * 4 * Copyright Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) 5 * Copyright Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk) 6 * Copyright Darryl Miles G7LED (dlm@g7led.demon.co.uk) 7 */ 8 #include <linux/module.h> 9 #include <linux/moduleparam.h> 10 #include <linux/capability.h> 11 #include <linux/errno.h> 12 #include <linux/types.h> 13 #include <linux/socket.h> 14 #include <linux/in.h> 15 #include <linux/slab.h> 16 #include <linux/kernel.h> 17 #include <linux/sched/signal.h> 18 #include <linux/timer.h> 19 #include <linux/string.h> 20 #include <linux/sockios.h> 21 #include <linux/net.h> 22 #include <linux/stat.h> 23 #include <net/ax25.h> 24 #include <linux/inet.h> 25 #include <linux/netdevice.h> 26 #include <linux/if_arp.h> 27 #include <linux/skbuff.h> 28 #include <net/net_namespace.h> 29 #include <net/sock.h> 30 #include <linux/uaccess.h> 31 #include <linux/fcntl.h> 32 #include <linux/termios.h> /* For TIOCINQ/OUTQ */ 33 #include <linux/mm.h> 34 #include <linux/interrupt.h> 35 #include <linux/notifier.h> 36 #include <net/netrom.h> 37 #include <linux/proc_fs.h> 38 #include <linux/seq_file.h> 39 #include <net/ip.h> 40 #include <net/tcp_states.h> 41 #include <net/arp.h> 42 #include <linux/init.h> 43 44 static int nr_ndevs = 4; 45 46 int sysctl_netrom_default_path_quality = NR_DEFAULT_QUAL; 47 int sysctl_netrom_obsolescence_count_initialiser = NR_DEFAULT_OBS; 48 int sysctl_netrom_network_ttl_initialiser = NR_DEFAULT_TTL; 49 int sysctl_netrom_transport_timeout = NR_DEFAULT_T1; 50 int sysctl_netrom_transport_maximum_tries = NR_DEFAULT_N2; 51 int sysctl_netrom_transport_acknowledge_delay = NR_DEFAULT_T2; 52 int sysctl_netrom_transport_busy_delay = NR_DEFAULT_T4; 53 int sysctl_netrom_transport_requested_window_size = NR_DEFAULT_WINDOW; 54 int sysctl_netrom_transport_no_activity_timeout = NR_DEFAULT_IDLE; 55 int sysctl_netrom_routing_control = NR_DEFAULT_ROUTING; 56 int sysctl_netrom_link_fails_count = NR_DEFAULT_FAILS; 57 int sysctl_netrom_reset_circuit = NR_DEFAULT_RESET; 58 59 static unsigned short circuit = 0x101; 60 61 static HLIST_HEAD(nr_list); 62 static DEFINE_SPINLOCK(nr_list_lock); 63 64 static const struct proto_ops nr_proto_ops; 65 66 /* 67 * NETROM network devices are virtual network devices encapsulating NETROM 68 * frames into AX.25 which will be sent through an AX.25 device, so form a 69 * special "super class" of normal net devices; split their locks off into a 70 * separate class since they always nest. 71 */ 72 static struct lock_class_key nr_netdev_xmit_lock_key; 73 static struct lock_class_key nr_netdev_addr_lock_key; 74 75 static void nr_set_lockdep_one(struct net_device *dev, 76 struct netdev_queue *txq, 77 void *_unused) 78 { 79 lockdep_set_class(&txq->_xmit_lock, &nr_netdev_xmit_lock_key); 80 } 81 82 static void nr_set_lockdep_key(struct net_device *dev) 83 { 84 lockdep_set_class(&dev->addr_list_lock, &nr_netdev_addr_lock_key); 85 netdev_for_each_tx_queue(dev, nr_set_lockdep_one, NULL); 86 } 87 88 /* 89 * Socket removal during an interrupt is now safe. 90 */ 91 static void nr_remove_socket(struct sock *sk) 92 { 93 spin_lock_bh(&nr_list_lock); 94 sk_del_node_init(sk); 95 spin_unlock_bh(&nr_list_lock); 96 } 97 98 /* 99 * Kill all bound sockets on a dropped device. 100 */ 101 static void nr_kill_by_device(struct net_device *dev) 102 { 103 struct sock *s; 104 105 spin_lock_bh(&nr_list_lock); 106 sk_for_each(s, &nr_list) 107 if (nr_sk(s)->device == dev) 108 nr_disconnect(s, ENETUNREACH); 109 spin_unlock_bh(&nr_list_lock); 110 } 111 112 /* 113 * Handle device status changes. 114 */ 115 static int nr_device_event(struct notifier_block *this, unsigned long event, void *ptr) 116 { 117 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 118 119 if (!net_eq(dev_net(dev), &init_net)) 120 return NOTIFY_DONE; 121 122 if (event != NETDEV_DOWN) 123 return NOTIFY_DONE; 124 125 nr_kill_by_device(dev); 126 nr_rt_device_down(dev); 127 128 return NOTIFY_DONE; 129 } 130 131 /* 132 * Add a socket to the bound sockets list. 133 */ 134 static void nr_insert_socket(struct sock *sk) 135 { 136 spin_lock_bh(&nr_list_lock); 137 sk_add_node(sk, &nr_list); 138 spin_unlock_bh(&nr_list_lock); 139 } 140 141 /* 142 * Find a socket that wants to accept the Connect Request we just 143 * received. 144 */ 145 static struct sock *nr_find_listener(ax25_address *addr) 146 { 147 struct sock *s; 148 149 spin_lock_bh(&nr_list_lock); 150 sk_for_each(s, &nr_list) 151 if (!ax25cmp(&nr_sk(s)->source_addr, addr) && 152 s->sk_state == TCP_LISTEN) { 153 sock_hold(s); 154 goto found; 155 } 156 s = NULL; 157 found: 158 spin_unlock_bh(&nr_list_lock); 159 return s; 160 } 161 162 /* 163 * Find a connected NET/ROM socket given my circuit IDs. 164 */ 165 static struct sock *nr_find_socket(unsigned char index, unsigned char id) 166 { 167 struct sock *s; 168 169 spin_lock_bh(&nr_list_lock); 170 sk_for_each(s, &nr_list) { 171 struct nr_sock *nr = nr_sk(s); 172 173 if (nr->my_index == index && nr->my_id == id) { 174 sock_hold(s); 175 goto found; 176 } 177 } 178 s = NULL; 179 found: 180 spin_unlock_bh(&nr_list_lock); 181 return s; 182 } 183 184 /* 185 * Find a connected NET/ROM socket given their circuit IDs. 186 */ 187 static struct sock *nr_find_peer(unsigned char index, unsigned char id, 188 ax25_address *dest) 189 { 190 struct sock *s; 191 192 spin_lock_bh(&nr_list_lock); 193 sk_for_each(s, &nr_list) { 194 struct nr_sock *nr = nr_sk(s); 195 196 if (nr->your_index == index && nr->your_id == id && 197 !ax25cmp(&nr->dest_addr, dest)) { 198 sock_hold(s); 199 goto found; 200 } 201 } 202 s = NULL; 203 found: 204 spin_unlock_bh(&nr_list_lock); 205 return s; 206 } 207 208 /* 209 * Find next free circuit ID. 210 */ 211 static unsigned short nr_find_next_circuit(void) 212 { 213 unsigned short id = circuit; 214 unsigned char i, j; 215 struct sock *sk; 216 217 for (;;) { 218 i = id / 256; 219 j = id % 256; 220 221 if (i != 0 && j != 0) { 222 if ((sk=nr_find_socket(i, j)) == NULL) 223 break; 224 sock_put(sk); 225 } 226 227 id++; 228 } 229 230 return id; 231 } 232 233 /* 234 * Deferred destroy. 235 */ 236 void nr_destroy_socket(struct sock *); 237 238 /* 239 * Handler for deferred kills. 240 */ 241 static void nr_destroy_timer(struct timer_list *t) 242 { 243 struct sock *sk = from_timer(sk, t, sk_timer); 244 bh_lock_sock(sk); 245 sock_hold(sk); 246 nr_destroy_socket(sk); 247 bh_unlock_sock(sk); 248 sock_put(sk); 249 } 250 251 /* 252 * This is called from user mode and the timers. Thus it protects itself 253 * against interrupt users but doesn't worry about being called during 254 * work. Once it is removed from the queue no interrupt or bottom half 255 * will touch it and we are (fairly 8-) ) safe. 256 */ 257 void nr_destroy_socket(struct sock *sk) 258 { 259 struct sk_buff *skb; 260 261 nr_remove_socket(sk); 262 263 nr_stop_heartbeat(sk); 264 nr_stop_t1timer(sk); 265 nr_stop_t2timer(sk); 266 nr_stop_t4timer(sk); 267 nr_stop_idletimer(sk); 268 269 nr_clear_queues(sk); /* Flush the queues */ 270 271 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { 272 if (skb->sk != sk) { /* A pending connection */ 273 /* Queue the unaccepted socket for death */ 274 sock_set_flag(skb->sk, SOCK_DEAD); 275 nr_start_heartbeat(skb->sk); 276 nr_sk(skb->sk)->state = NR_STATE_0; 277 } 278 279 kfree_skb(skb); 280 } 281 282 if (sk_has_allocations(sk)) { 283 /* Defer: outstanding buffers */ 284 sk->sk_timer.function = nr_destroy_timer; 285 sk->sk_timer.expires = jiffies + 2 * HZ; 286 add_timer(&sk->sk_timer); 287 } else 288 sock_put(sk); 289 } 290 291 /* 292 * Handling for system calls applied via the various interfaces to a 293 * NET/ROM socket object. 294 */ 295 296 static int nr_setsockopt(struct socket *sock, int level, int optname, 297 sockptr_t optval, unsigned int optlen) 298 { 299 struct sock *sk = sock->sk; 300 struct nr_sock *nr = nr_sk(sk); 301 unsigned int opt; 302 303 if (level != SOL_NETROM) 304 return -ENOPROTOOPT; 305 306 if (optlen < sizeof(unsigned int)) 307 return -EINVAL; 308 309 if (copy_from_sockptr(&opt, optval, sizeof(opt))) 310 return -EFAULT; 311 312 switch (optname) { 313 case NETROM_T1: 314 if (opt < 1 || opt > UINT_MAX / HZ) 315 return -EINVAL; 316 nr->t1 = opt * HZ; 317 return 0; 318 319 case NETROM_T2: 320 if (opt < 1 || opt > UINT_MAX / HZ) 321 return -EINVAL; 322 nr->t2 = opt * HZ; 323 return 0; 324 325 case NETROM_N2: 326 if (opt < 1 || opt > 31) 327 return -EINVAL; 328 nr->n2 = opt; 329 return 0; 330 331 case NETROM_T4: 332 if (opt < 1 || opt > UINT_MAX / HZ) 333 return -EINVAL; 334 nr->t4 = opt * HZ; 335 return 0; 336 337 case NETROM_IDLE: 338 if (opt > UINT_MAX / (60 * HZ)) 339 return -EINVAL; 340 nr->idle = opt * 60 * HZ; 341 return 0; 342 343 default: 344 return -ENOPROTOOPT; 345 } 346 } 347 348 static int nr_getsockopt(struct socket *sock, int level, int optname, 349 char __user *optval, int __user *optlen) 350 { 351 struct sock *sk = sock->sk; 352 struct nr_sock *nr = nr_sk(sk); 353 int val = 0; 354 int len; 355 356 if (level != SOL_NETROM) 357 return -ENOPROTOOPT; 358 359 if (get_user(len, optlen)) 360 return -EFAULT; 361 362 if (len < 0) 363 return -EINVAL; 364 365 switch (optname) { 366 case NETROM_T1: 367 val = nr->t1 / HZ; 368 break; 369 370 case NETROM_T2: 371 val = nr->t2 / HZ; 372 break; 373 374 case NETROM_N2: 375 val = nr->n2; 376 break; 377 378 case NETROM_T4: 379 val = nr->t4 / HZ; 380 break; 381 382 case NETROM_IDLE: 383 val = nr->idle / (60 * HZ); 384 break; 385 386 default: 387 return -ENOPROTOOPT; 388 } 389 390 len = min_t(unsigned int, len, sizeof(int)); 391 392 if (put_user(len, optlen)) 393 return -EFAULT; 394 395 return copy_to_user(optval, &val, len) ? -EFAULT : 0; 396 } 397 398 static int nr_listen(struct socket *sock, int backlog) 399 { 400 struct sock *sk = sock->sk; 401 402 lock_sock(sk); 403 if (sock->state != SS_UNCONNECTED) { 404 release_sock(sk); 405 return -EINVAL; 406 } 407 408 if (sk->sk_state != TCP_LISTEN) { 409 memset(&nr_sk(sk)->user_addr, 0, AX25_ADDR_LEN); 410 sk->sk_max_ack_backlog = backlog; 411 sk->sk_state = TCP_LISTEN; 412 release_sock(sk); 413 return 0; 414 } 415 release_sock(sk); 416 417 return -EOPNOTSUPP; 418 } 419 420 static struct proto nr_proto = { 421 .name = "NETROM", 422 .owner = THIS_MODULE, 423 .obj_size = sizeof(struct nr_sock), 424 }; 425 426 static int nr_create(struct net *net, struct socket *sock, int protocol, 427 int kern) 428 { 429 struct sock *sk; 430 struct nr_sock *nr; 431 432 if (!net_eq(net, &init_net)) 433 return -EAFNOSUPPORT; 434 435 if (sock->type != SOCK_SEQPACKET || protocol != 0) 436 return -ESOCKTNOSUPPORT; 437 438 sk = sk_alloc(net, PF_NETROM, GFP_ATOMIC, &nr_proto, kern); 439 if (sk == NULL) 440 return -ENOMEM; 441 442 nr = nr_sk(sk); 443 444 sock_init_data(sock, sk); 445 446 sock->ops = &nr_proto_ops; 447 sk->sk_protocol = protocol; 448 449 skb_queue_head_init(&nr->ack_queue); 450 skb_queue_head_init(&nr->reseq_queue); 451 skb_queue_head_init(&nr->frag_queue); 452 453 nr_init_timers(sk); 454 455 nr->t1 = 456 msecs_to_jiffies(sysctl_netrom_transport_timeout); 457 nr->t2 = 458 msecs_to_jiffies(sysctl_netrom_transport_acknowledge_delay); 459 nr->n2 = 460 msecs_to_jiffies(sysctl_netrom_transport_maximum_tries); 461 nr->t4 = 462 msecs_to_jiffies(sysctl_netrom_transport_busy_delay); 463 nr->idle = 464 msecs_to_jiffies(sysctl_netrom_transport_no_activity_timeout); 465 nr->window = sysctl_netrom_transport_requested_window_size; 466 467 nr->bpqext = 1; 468 nr->state = NR_STATE_0; 469 470 return 0; 471 } 472 473 static struct sock *nr_make_new(struct sock *osk) 474 { 475 struct sock *sk; 476 struct nr_sock *nr, *onr; 477 478 if (osk->sk_type != SOCK_SEQPACKET) 479 return NULL; 480 481 sk = sk_alloc(sock_net(osk), PF_NETROM, GFP_ATOMIC, osk->sk_prot, 0); 482 if (sk == NULL) 483 return NULL; 484 485 nr = nr_sk(sk); 486 487 sock_init_data(NULL, sk); 488 489 sk->sk_type = osk->sk_type; 490 sk->sk_priority = osk->sk_priority; 491 sk->sk_protocol = osk->sk_protocol; 492 sk->sk_rcvbuf = osk->sk_rcvbuf; 493 sk->sk_sndbuf = osk->sk_sndbuf; 494 sk->sk_state = TCP_ESTABLISHED; 495 sock_copy_flags(sk, osk); 496 497 skb_queue_head_init(&nr->ack_queue); 498 skb_queue_head_init(&nr->reseq_queue); 499 skb_queue_head_init(&nr->frag_queue); 500 501 nr_init_timers(sk); 502 503 onr = nr_sk(osk); 504 505 nr->t1 = onr->t1; 506 nr->t2 = onr->t2; 507 nr->n2 = onr->n2; 508 nr->t4 = onr->t4; 509 nr->idle = onr->idle; 510 nr->window = onr->window; 511 512 nr->device = onr->device; 513 nr->bpqext = onr->bpqext; 514 515 return sk; 516 } 517 518 static int nr_release(struct socket *sock) 519 { 520 struct sock *sk = sock->sk; 521 struct nr_sock *nr; 522 523 if (sk == NULL) return 0; 524 525 sock_hold(sk); 526 sock_orphan(sk); 527 lock_sock(sk); 528 nr = nr_sk(sk); 529 530 switch (nr->state) { 531 case NR_STATE_0: 532 case NR_STATE_1: 533 case NR_STATE_2: 534 nr_disconnect(sk, 0); 535 nr_destroy_socket(sk); 536 break; 537 538 case NR_STATE_3: 539 nr_clear_queues(sk); 540 nr->n2count = 0; 541 nr_write_internal(sk, NR_DISCREQ); 542 nr_start_t1timer(sk); 543 nr_stop_t2timer(sk); 544 nr_stop_t4timer(sk); 545 nr_stop_idletimer(sk); 546 nr->state = NR_STATE_2; 547 sk->sk_state = TCP_CLOSE; 548 sk->sk_shutdown |= SEND_SHUTDOWN; 549 sk->sk_state_change(sk); 550 sock_set_flag(sk, SOCK_DESTROY); 551 break; 552 553 default: 554 break; 555 } 556 557 sock->sk = NULL; 558 release_sock(sk); 559 sock_put(sk); 560 561 return 0; 562 } 563 564 static int nr_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 565 { 566 struct sock *sk = sock->sk; 567 struct nr_sock *nr = nr_sk(sk); 568 struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr; 569 struct net_device *dev; 570 ax25_uid_assoc *user; 571 ax25_address *source; 572 573 lock_sock(sk); 574 if (!sock_flag(sk, SOCK_ZAPPED)) { 575 release_sock(sk); 576 return -EINVAL; 577 } 578 if (addr_len < sizeof(struct sockaddr_ax25) || addr_len > sizeof(struct full_sockaddr_ax25)) { 579 release_sock(sk); 580 return -EINVAL; 581 } 582 if (addr_len < (addr->fsa_ax25.sax25_ndigis * sizeof(ax25_address) + sizeof(struct sockaddr_ax25))) { 583 release_sock(sk); 584 return -EINVAL; 585 } 586 if (addr->fsa_ax25.sax25_family != AF_NETROM) { 587 release_sock(sk); 588 return -EINVAL; 589 } 590 if ((dev = nr_dev_get(&addr->fsa_ax25.sax25_call)) == NULL) { 591 release_sock(sk); 592 return -EADDRNOTAVAIL; 593 } 594 595 /* 596 * Only the super user can set an arbitrary user callsign. 597 */ 598 if (addr->fsa_ax25.sax25_ndigis == 1) { 599 if (!capable(CAP_NET_BIND_SERVICE)) { 600 dev_put(dev); 601 release_sock(sk); 602 return -EPERM; 603 } 604 nr->user_addr = addr->fsa_digipeater[0]; 605 nr->source_addr = addr->fsa_ax25.sax25_call; 606 } else { 607 source = &addr->fsa_ax25.sax25_call; 608 609 user = ax25_findbyuid(current_euid()); 610 if (user) { 611 nr->user_addr = user->call; 612 ax25_uid_put(user); 613 } else { 614 if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) { 615 release_sock(sk); 616 dev_put(dev); 617 return -EPERM; 618 } 619 nr->user_addr = *source; 620 } 621 622 nr->source_addr = *source; 623 } 624 625 nr->device = dev; 626 nr_insert_socket(sk); 627 628 sock_reset_flag(sk, SOCK_ZAPPED); 629 dev_put(dev); 630 release_sock(sk); 631 632 return 0; 633 } 634 635 static int nr_connect(struct socket *sock, struct sockaddr *uaddr, 636 int addr_len, int flags) 637 { 638 struct sock *sk = sock->sk; 639 struct nr_sock *nr = nr_sk(sk); 640 struct sockaddr_ax25 *addr = (struct sockaddr_ax25 *)uaddr; 641 const ax25_address *source = NULL; 642 ax25_uid_assoc *user; 643 struct net_device *dev; 644 int err = 0; 645 646 lock_sock(sk); 647 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) { 648 sock->state = SS_CONNECTED; 649 goto out_release; /* Connect completed during a ERESTARTSYS event */ 650 } 651 652 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) { 653 sock->state = SS_UNCONNECTED; 654 err = -ECONNREFUSED; 655 goto out_release; 656 } 657 658 if (sk->sk_state == TCP_ESTABLISHED) { 659 err = -EISCONN; /* No reconnect on a seqpacket socket */ 660 goto out_release; 661 } 662 663 sk->sk_state = TCP_CLOSE; 664 sock->state = SS_UNCONNECTED; 665 666 if (addr_len != sizeof(struct sockaddr_ax25) && addr_len != sizeof(struct full_sockaddr_ax25)) { 667 err = -EINVAL; 668 goto out_release; 669 } 670 if (addr->sax25_family != AF_NETROM) { 671 err = -EINVAL; 672 goto out_release; 673 } 674 if (sock_flag(sk, SOCK_ZAPPED)) { /* Must bind first - autobinding in this may or may not work */ 675 sock_reset_flag(sk, SOCK_ZAPPED); 676 677 if ((dev = nr_dev_first()) == NULL) { 678 err = -ENETUNREACH; 679 goto out_release; 680 } 681 source = (const ax25_address *)dev->dev_addr; 682 683 user = ax25_findbyuid(current_euid()); 684 if (user) { 685 nr->user_addr = user->call; 686 ax25_uid_put(user); 687 } else { 688 if (ax25_uid_policy && !capable(CAP_NET_ADMIN)) { 689 dev_put(dev); 690 err = -EPERM; 691 goto out_release; 692 } 693 nr->user_addr = *source; 694 } 695 696 nr->source_addr = *source; 697 nr->device = dev; 698 699 dev_put(dev); 700 nr_insert_socket(sk); /* Finish the bind */ 701 } 702 703 nr->dest_addr = addr->sax25_call; 704 705 release_sock(sk); 706 circuit = nr_find_next_circuit(); 707 lock_sock(sk); 708 709 nr->my_index = circuit / 256; 710 nr->my_id = circuit % 256; 711 712 circuit++; 713 714 /* Move to connecting socket, start sending Connect Requests */ 715 sock->state = SS_CONNECTING; 716 sk->sk_state = TCP_SYN_SENT; 717 718 nr_establish_data_link(sk); 719 720 nr->state = NR_STATE_1; 721 722 nr_start_heartbeat(sk); 723 724 /* Now the loop */ 725 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) { 726 err = -EINPROGRESS; 727 goto out_release; 728 } 729 730 /* 731 * A Connect Ack with Choke or timeout or failed routing will go to 732 * closed. 733 */ 734 if (sk->sk_state == TCP_SYN_SENT) { 735 DEFINE_WAIT(wait); 736 737 for (;;) { 738 prepare_to_wait(sk_sleep(sk), &wait, 739 TASK_INTERRUPTIBLE); 740 if (sk->sk_state != TCP_SYN_SENT) 741 break; 742 if (!signal_pending(current)) { 743 release_sock(sk); 744 schedule(); 745 lock_sock(sk); 746 continue; 747 } 748 err = -ERESTARTSYS; 749 break; 750 } 751 finish_wait(sk_sleep(sk), &wait); 752 if (err) 753 goto out_release; 754 } 755 756 if (sk->sk_state != TCP_ESTABLISHED) { 757 sock->state = SS_UNCONNECTED; 758 err = sock_error(sk); /* Always set at this point */ 759 goto out_release; 760 } 761 762 sock->state = SS_CONNECTED; 763 764 out_release: 765 release_sock(sk); 766 767 return err; 768 } 769 770 static int nr_accept(struct socket *sock, struct socket *newsock, int flags, 771 bool kern) 772 { 773 struct sk_buff *skb; 774 struct sock *newsk; 775 DEFINE_WAIT(wait); 776 struct sock *sk; 777 int err = 0; 778 779 if ((sk = sock->sk) == NULL) 780 return -EINVAL; 781 782 lock_sock(sk); 783 if (sk->sk_type != SOCK_SEQPACKET) { 784 err = -EOPNOTSUPP; 785 goto out_release; 786 } 787 788 if (sk->sk_state != TCP_LISTEN) { 789 err = -EINVAL; 790 goto out_release; 791 } 792 793 /* 794 * The write queue this time is holding sockets ready to use 795 * hooked into the SABM we saved 796 */ 797 for (;;) { 798 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 799 skb = skb_dequeue(&sk->sk_receive_queue); 800 if (skb) 801 break; 802 803 if (flags & O_NONBLOCK) { 804 err = -EWOULDBLOCK; 805 break; 806 } 807 if (!signal_pending(current)) { 808 release_sock(sk); 809 schedule(); 810 lock_sock(sk); 811 continue; 812 } 813 err = -ERESTARTSYS; 814 break; 815 } 816 finish_wait(sk_sleep(sk), &wait); 817 if (err) 818 goto out_release; 819 820 newsk = skb->sk; 821 sock_graft(newsk, newsock); 822 823 /* Now attach up the new socket */ 824 kfree_skb(skb); 825 sk_acceptq_removed(sk); 826 827 out_release: 828 release_sock(sk); 829 830 return err; 831 } 832 833 static int nr_getname(struct socket *sock, struct sockaddr *uaddr, 834 int peer) 835 { 836 struct full_sockaddr_ax25 *sax = (struct full_sockaddr_ax25 *)uaddr; 837 struct sock *sk = sock->sk; 838 struct nr_sock *nr = nr_sk(sk); 839 int uaddr_len; 840 841 memset(&sax->fsa_ax25, 0, sizeof(struct sockaddr_ax25)); 842 843 lock_sock(sk); 844 if (peer != 0) { 845 if (sk->sk_state != TCP_ESTABLISHED) { 846 release_sock(sk); 847 return -ENOTCONN; 848 } 849 sax->fsa_ax25.sax25_family = AF_NETROM; 850 sax->fsa_ax25.sax25_ndigis = 1; 851 sax->fsa_ax25.sax25_call = nr->user_addr; 852 memset(sax->fsa_digipeater, 0, sizeof(sax->fsa_digipeater)); 853 sax->fsa_digipeater[0] = nr->dest_addr; 854 uaddr_len = sizeof(struct full_sockaddr_ax25); 855 } else { 856 sax->fsa_ax25.sax25_family = AF_NETROM; 857 sax->fsa_ax25.sax25_ndigis = 0; 858 sax->fsa_ax25.sax25_call = nr->source_addr; 859 uaddr_len = sizeof(struct sockaddr_ax25); 860 } 861 release_sock(sk); 862 863 return uaddr_len; 864 } 865 866 int nr_rx_frame(struct sk_buff *skb, struct net_device *dev) 867 { 868 struct sock *sk; 869 struct sock *make; 870 struct nr_sock *nr_make; 871 ax25_address *src, *dest, *user; 872 unsigned short circuit_index, circuit_id; 873 unsigned short peer_circuit_index, peer_circuit_id; 874 unsigned short frametype, flags, window, timeout; 875 int ret; 876 877 skb_orphan(skb); 878 879 /* 880 * skb->data points to the netrom frame start 881 */ 882 883 src = (ax25_address *)(skb->data + 0); 884 dest = (ax25_address *)(skb->data + 7); 885 886 circuit_index = skb->data[15]; 887 circuit_id = skb->data[16]; 888 peer_circuit_index = skb->data[17]; 889 peer_circuit_id = skb->data[18]; 890 frametype = skb->data[19] & 0x0F; 891 flags = skb->data[19] & 0xF0; 892 893 /* 894 * Check for an incoming IP over NET/ROM frame. 895 */ 896 if (frametype == NR_PROTOEXT && 897 circuit_index == NR_PROTO_IP && circuit_id == NR_PROTO_IP) { 898 skb_pull(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN); 899 skb_reset_transport_header(skb); 900 901 return nr_rx_ip(skb, dev); 902 } 903 904 /* 905 * Find an existing socket connection, based on circuit ID, if it's 906 * a Connect Request base it on their circuit ID. 907 * 908 * Circuit ID 0/0 is not valid but it could still be a "reset" for a 909 * circuit that no longer exists at the other end ... 910 */ 911 912 sk = NULL; 913 914 if (circuit_index == 0 && circuit_id == 0) { 915 if (frametype == NR_CONNACK && flags == NR_CHOKE_FLAG) 916 sk = nr_find_peer(peer_circuit_index, peer_circuit_id, src); 917 } else { 918 if (frametype == NR_CONNREQ) 919 sk = nr_find_peer(circuit_index, circuit_id, src); 920 else 921 sk = nr_find_socket(circuit_index, circuit_id); 922 } 923 924 if (sk != NULL) { 925 bh_lock_sock(sk); 926 skb_reset_transport_header(skb); 927 928 if (frametype == NR_CONNACK && skb->len == 22) 929 nr_sk(sk)->bpqext = 1; 930 else 931 nr_sk(sk)->bpqext = 0; 932 933 ret = nr_process_rx_frame(sk, skb); 934 bh_unlock_sock(sk); 935 sock_put(sk); 936 return ret; 937 } 938 939 /* 940 * Now it should be a CONNREQ. 941 */ 942 if (frametype != NR_CONNREQ) { 943 /* 944 * Here it would be nice to be able to send a reset but 945 * NET/ROM doesn't have one. We've tried to extend the protocol 946 * by sending NR_CONNACK | NR_CHOKE_FLAGS replies but that 947 * apparently kills BPQ boxes... :-( 948 * So now we try to follow the established behaviour of 949 * G8PZT's Xrouter which is sending packets with command type 7 950 * as an extension of the protocol. 951 */ 952 if (sysctl_netrom_reset_circuit && 953 (frametype != NR_RESET || flags != 0)) 954 nr_transmit_reset(skb, 1); 955 956 return 0; 957 } 958 959 sk = nr_find_listener(dest); 960 961 user = (ax25_address *)(skb->data + 21); 962 963 if (sk == NULL || sk_acceptq_is_full(sk) || 964 (make = nr_make_new(sk)) == NULL) { 965 nr_transmit_refusal(skb, 0); 966 if (sk) 967 sock_put(sk); 968 return 0; 969 } 970 971 bh_lock_sock(sk); 972 973 window = skb->data[20]; 974 975 sock_hold(make); 976 skb->sk = make; 977 skb->destructor = sock_efree; 978 make->sk_state = TCP_ESTABLISHED; 979 980 /* Fill in his circuit details */ 981 nr_make = nr_sk(make); 982 nr_make->source_addr = *dest; 983 nr_make->dest_addr = *src; 984 nr_make->user_addr = *user; 985 986 nr_make->your_index = circuit_index; 987 nr_make->your_id = circuit_id; 988 989 bh_unlock_sock(sk); 990 circuit = nr_find_next_circuit(); 991 bh_lock_sock(sk); 992 993 nr_make->my_index = circuit / 256; 994 nr_make->my_id = circuit % 256; 995 996 circuit++; 997 998 /* Window negotiation */ 999 if (window < nr_make->window) 1000 nr_make->window = window; 1001 1002 /* L4 timeout negotiation */ 1003 if (skb->len == 37) { 1004 timeout = skb->data[36] * 256 + skb->data[35]; 1005 if (timeout * HZ < nr_make->t1) 1006 nr_make->t1 = timeout * HZ; 1007 nr_make->bpqext = 1; 1008 } else { 1009 nr_make->bpqext = 0; 1010 } 1011 1012 nr_write_internal(make, NR_CONNACK); 1013 1014 nr_make->condition = 0x00; 1015 nr_make->vs = 0; 1016 nr_make->va = 0; 1017 nr_make->vr = 0; 1018 nr_make->vl = 0; 1019 nr_make->state = NR_STATE_3; 1020 sk_acceptq_added(sk); 1021 skb_queue_head(&sk->sk_receive_queue, skb); 1022 1023 if (!sock_flag(sk, SOCK_DEAD)) 1024 sk->sk_data_ready(sk); 1025 1026 bh_unlock_sock(sk); 1027 sock_put(sk); 1028 1029 nr_insert_socket(make); 1030 1031 nr_start_heartbeat(make); 1032 nr_start_idletimer(make); 1033 1034 return 1; 1035 } 1036 1037 static int nr_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) 1038 { 1039 struct sock *sk = sock->sk; 1040 struct nr_sock *nr = nr_sk(sk); 1041 DECLARE_SOCKADDR(struct sockaddr_ax25 *, usax, msg->msg_name); 1042 int err; 1043 struct sockaddr_ax25 sax; 1044 struct sk_buff *skb; 1045 unsigned char *asmptr; 1046 int size; 1047 1048 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT)) 1049 return -EINVAL; 1050 1051 lock_sock(sk); 1052 if (sock_flag(sk, SOCK_ZAPPED)) { 1053 err = -EADDRNOTAVAIL; 1054 goto out; 1055 } 1056 1057 if (sk->sk_shutdown & SEND_SHUTDOWN) { 1058 send_sig(SIGPIPE, current, 0); 1059 err = -EPIPE; 1060 goto out; 1061 } 1062 1063 if (nr->device == NULL) { 1064 err = -ENETUNREACH; 1065 goto out; 1066 } 1067 1068 if (usax) { 1069 if (msg->msg_namelen < sizeof(sax)) { 1070 err = -EINVAL; 1071 goto out; 1072 } 1073 sax = *usax; 1074 if (ax25cmp(&nr->dest_addr, &sax.sax25_call) != 0) { 1075 err = -EISCONN; 1076 goto out; 1077 } 1078 if (sax.sax25_family != AF_NETROM) { 1079 err = -EINVAL; 1080 goto out; 1081 } 1082 } else { 1083 if (sk->sk_state != TCP_ESTABLISHED) { 1084 err = -ENOTCONN; 1085 goto out; 1086 } 1087 sax.sax25_family = AF_NETROM; 1088 sax.sax25_call = nr->dest_addr; 1089 } 1090 1091 /* Build a packet - the conventional user limit is 236 bytes. We can 1092 do ludicrously large NetROM frames but must not overflow */ 1093 if (len > 65536) { 1094 err = -EMSGSIZE; 1095 goto out; 1096 } 1097 1098 size = len + NR_NETWORK_LEN + NR_TRANSPORT_LEN; 1099 1100 if ((skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL) 1101 goto out; 1102 1103 skb_reserve(skb, size - len); 1104 skb_reset_transport_header(skb); 1105 1106 /* 1107 * Push down the NET/ROM header 1108 */ 1109 1110 asmptr = skb_push(skb, NR_TRANSPORT_LEN); 1111 1112 /* Build a NET/ROM Transport header */ 1113 1114 *asmptr++ = nr->your_index; 1115 *asmptr++ = nr->your_id; 1116 *asmptr++ = 0; /* To be filled in later */ 1117 *asmptr++ = 0; /* Ditto */ 1118 *asmptr++ = NR_INFO; 1119 1120 /* 1121 * Put the data on the end 1122 */ 1123 skb_put(skb, len); 1124 1125 /* User data follows immediately after the NET/ROM transport header */ 1126 if (memcpy_from_msg(skb_transport_header(skb), msg, len)) { 1127 kfree_skb(skb); 1128 err = -EFAULT; 1129 goto out; 1130 } 1131 1132 if (sk->sk_state != TCP_ESTABLISHED) { 1133 kfree_skb(skb); 1134 err = -ENOTCONN; 1135 goto out; 1136 } 1137 1138 nr_output(sk, skb); /* Shove it onto the queue */ 1139 1140 err = len; 1141 out: 1142 release_sock(sk); 1143 return err; 1144 } 1145 1146 static int nr_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 1147 int flags) 1148 { 1149 struct sock *sk = sock->sk; 1150 DECLARE_SOCKADDR(struct sockaddr_ax25 *, sax, msg->msg_name); 1151 size_t copied; 1152 struct sk_buff *skb; 1153 int er; 1154 1155 /* 1156 * This works for seqpacket too. The receiver has ordered the queue for 1157 * us! We do one quick check first though 1158 */ 1159 1160 lock_sock(sk); 1161 if (sk->sk_state != TCP_ESTABLISHED) { 1162 release_sock(sk); 1163 return -ENOTCONN; 1164 } 1165 1166 /* Now we can treat all alike */ 1167 skb = skb_recv_datagram(sk, flags, &er); 1168 if (!skb) { 1169 release_sock(sk); 1170 return er; 1171 } 1172 1173 skb_reset_transport_header(skb); 1174 copied = skb->len; 1175 1176 if (copied > size) { 1177 copied = size; 1178 msg->msg_flags |= MSG_TRUNC; 1179 } 1180 1181 er = skb_copy_datagram_msg(skb, 0, msg, copied); 1182 if (er < 0) { 1183 skb_free_datagram(sk, skb); 1184 release_sock(sk); 1185 return er; 1186 } 1187 1188 if (sax != NULL) { 1189 memset(sax, 0, sizeof(*sax)); 1190 sax->sax25_family = AF_NETROM; 1191 skb_copy_from_linear_data_offset(skb, 7, sax->sax25_call.ax25_call, 1192 AX25_ADDR_LEN); 1193 msg->msg_namelen = sizeof(*sax); 1194 } 1195 1196 skb_free_datagram(sk, skb); 1197 1198 release_sock(sk); 1199 return copied; 1200 } 1201 1202 1203 static int nr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1204 { 1205 struct sock *sk = sock->sk; 1206 void __user *argp = (void __user *)arg; 1207 1208 switch (cmd) { 1209 case TIOCOUTQ: { 1210 long amount; 1211 1212 lock_sock(sk); 1213 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk); 1214 if (amount < 0) 1215 amount = 0; 1216 release_sock(sk); 1217 return put_user(amount, (int __user *)argp); 1218 } 1219 1220 case TIOCINQ: { 1221 struct sk_buff *skb; 1222 long amount = 0L; 1223 1224 lock_sock(sk); 1225 /* These two are safe on a single CPU system as only user tasks fiddle here */ 1226 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) 1227 amount = skb->len; 1228 release_sock(sk); 1229 return put_user(amount, (int __user *)argp); 1230 } 1231 1232 case SIOCGIFADDR: 1233 case SIOCSIFADDR: 1234 case SIOCGIFDSTADDR: 1235 case SIOCSIFDSTADDR: 1236 case SIOCGIFBRDADDR: 1237 case SIOCSIFBRDADDR: 1238 case SIOCGIFNETMASK: 1239 case SIOCSIFNETMASK: 1240 case SIOCGIFMETRIC: 1241 case SIOCSIFMETRIC: 1242 return -EINVAL; 1243 1244 case SIOCADDRT: 1245 case SIOCDELRT: 1246 case SIOCNRDECOBS: 1247 if (!capable(CAP_NET_ADMIN)) 1248 return -EPERM; 1249 return nr_rt_ioctl(cmd, argp); 1250 1251 default: 1252 return -ENOIOCTLCMD; 1253 } 1254 1255 return 0; 1256 } 1257 1258 #ifdef CONFIG_PROC_FS 1259 1260 static void *nr_info_start(struct seq_file *seq, loff_t *pos) 1261 __acquires(&nr_list_lock) 1262 { 1263 spin_lock_bh(&nr_list_lock); 1264 return seq_hlist_start_head(&nr_list, *pos); 1265 } 1266 1267 static void *nr_info_next(struct seq_file *seq, void *v, loff_t *pos) 1268 { 1269 return seq_hlist_next(v, &nr_list, pos); 1270 } 1271 1272 static void nr_info_stop(struct seq_file *seq, void *v) 1273 __releases(&nr_list_lock) 1274 { 1275 spin_unlock_bh(&nr_list_lock); 1276 } 1277 1278 static int nr_info_show(struct seq_file *seq, void *v) 1279 { 1280 struct sock *s = sk_entry(v); 1281 struct net_device *dev; 1282 struct nr_sock *nr; 1283 const char *devname; 1284 char buf[11]; 1285 1286 if (v == SEQ_START_TOKEN) 1287 seq_puts(seq, 1288 "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"); 1289 1290 else { 1291 1292 bh_lock_sock(s); 1293 nr = nr_sk(s); 1294 1295 if ((dev = nr->device) == NULL) 1296 devname = "???"; 1297 else 1298 devname = dev->name; 1299 1300 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->user_addr)); 1301 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->dest_addr)); 1302 seq_printf(seq, 1303 "%-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", 1304 ax2asc(buf, &nr->source_addr), 1305 devname, 1306 nr->my_index, 1307 nr->my_id, 1308 nr->your_index, 1309 nr->your_id, 1310 nr->state, 1311 nr->vs, 1312 nr->vr, 1313 nr->va, 1314 ax25_display_timer(&nr->t1timer) / HZ, 1315 nr->t1 / HZ, 1316 ax25_display_timer(&nr->t2timer) / HZ, 1317 nr->t2 / HZ, 1318 ax25_display_timer(&nr->t4timer) / HZ, 1319 nr->t4 / HZ, 1320 ax25_display_timer(&nr->idletimer) / (60 * HZ), 1321 nr->idle / (60 * HZ), 1322 nr->n2count, 1323 nr->n2, 1324 nr->window, 1325 sk_wmem_alloc_get(s), 1326 sk_rmem_alloc_get(s), 1327 s->sk_socket ? SOCK_INODE(s->sk_socket)->i_ino : 0L); 1328 1329 bh_unlock_sock(s); 1330 } 1331 return 0; 1332 } 1333 1334 static const struct seq_operations nr_info_seqops = { 1335 .start = nr_info_start, 1336 .next = nr_info_next, 1337 .stop = nr_info_stop, 1338 .show = nr_info_show, 1339 }; 1340 #endif /* CONFIG_PROC_FS */ 1341 1342 static const struct net_proto_family nr_family_ops = { 1343 .family = PF_NETROM, 1344 .create = nr_create, 1345 .owner = THIS_MODULE, 1346 }; 1347 1348 static const struct proto_ops nr_proto_ops = { 1349 .family = PF_NETROM, 1350 .owner = THIS_MODULE, 1351 .release = nr_release, 1352 .bind = nr_bind, 1353 .connect = nr_connect, 1354 .socketpair = sock_no_socketpair, 1355 .accept = nr_accept, 1356 .getname = nr_getname, 1357 .poll = datagram_poll, 1358 .ioctl = nr_ioctl, 1359 .gettstamp = sock_gettstamp, 1360 .listen = nr_listen, 1361 .shutdown = sock_no_shutdown, 1362 .setsockopt = nr_setsockopt, 1363 .getsockopt = nr_getsockopt, 1364 .sendmsg = nr_sendmsg, 1365 .recvmsg = nr_recvmsg, 1366 .mmap = sock_no_mmap, 1367 }; 1368 1369 static struct notifier_block nr_dev_notifier = { 1370 .notifier_call = nr_device_event, 1371 }; 1372 1373 static struct net_device **dev_nr; 1374 1375 static struct ax25_protocol nr_pid = { 1376 .pid = AX25_P_NETROM, 1377 .func = nr_route_frame 1378 }; 1379 1380 static struct ax25_linkfail nr_linkfail_notifier = { 1381 .func = nr_link_failed, 1382 }; 1383 1384 static int __init nr_proto_init(void) 1385 { 1386 int i; 1387 int rc = proto_register(&nr_proto, 0); 1388 1389 if (rc) 1390 return rc; 1391 1392 if (nr_ndevs > 0x7fffffff/sizeof(struct net_device *)) { 1393 pr_err("NET/ROM: %s - nr_ndevs parameter too large\n", 1394 __func__); 1395 rc = -EINVAL; 1396 goto unregister_proto; 1397 } 1398 1399 dev_nr = kcalloc(nr_ndevs, sizeof(struct net_device *), GFP_KERNEL); 1400 if (!dev_nr) { 1401 pr_err("NET/ROM: %s - unable to allocate device array\n", 1402 __func__); 1403 rc = -ENOMEM; 1404 goto unregister_proto; 1405 } 1406 1407 for (i = 0; i < nr_ndevs; i++) { 1408 char name[IFNAMSIZ]; 1409 struct net_device *dev; 1410 1411 sprintf(name, "nr%d", i); 1412 dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, nr_setup); 1413 if (!dev) { 1414 rc = -ENOMEM; 1415 goto fail; 1416 } 1417 1418 dev->base_addr = i; 1419 rc = register_netdev(dev); 1420 if (rc) { 1421 free_netdev(dev); 1422 goto fail; 1423 } 1424 nr_set_lockdep_key(dev); 1425 dev_nr[i] = dev; 1426 } 1427 1428 rc = sock_register(&nr_family_ops); 1429 if (rc) 1430 goto fail; 1431 1432 rc = register_netdevice_notifier(&nr_dev_notifier); 1433 if (rc) 1434 goto out_sock; 1435 1436 ax25_register_pid(&nr_pid); 1437 ax25_linkfail_register(&nr_linkfail_notifier); 1438 1439 #ifdef CONFIG_SYSCTL 1440 rc = nr_register_sysctl(); 1441 if (rc) 1442 goto out_sysctl; 1443 #endif 1444 1445 nr_loopback_init(); 1446 1447 rc = -ENOMEM; 1448 if (!proc_create_seq("nr", 0444, init_net.proc_net, &nr_info_seqops)) 1449 goto proc_remove1; 1450 if (!proc_create_seq("nr_neigh", 0444, init_net.proc_net, 1451 &nr_neigh_seqops)) 1452 goto proc_remove2; 1453 if (!proc_create_seq("nr_nodes", 0444, init_net.proc_net, 1454 &nr_node_seqops)) 1455 goto proc_remove3; 1456 1457 return 0; 1458 1459 proc_remove3: 1460 remove_proc_entry("nr_neigh", init_net.proc_net); 1461 proc_remove2: 1462 remove_proc_entry("nr", init_net.proc_net); 1463 proc_remove1: 1464 1465 nr_loopback_clear(); 1466 nr_rt_free(); 1467 1468 #ifdef CONFIG_SYSCTL 1469 nr_unregister_sysctl(); 1470 out_sysctl: 1471 #endif 1472 ax25_linkfail_release(&nr_linkfail_notifier); 1473 ax25_protocol_release(AX25_P_NETROM); 1474 unregister_netdevice_notifier(&nr_dev_notifier); 1475 out_sock: 1476 sock_unregister(PF_NETROM); 1477 fail: 1478 while (--i >= 0) { 1479 unregister_netdev(dev_nr[i]); 1480 free_netdev(dev_nr[i]); 1481 } 1482 kfree(dev_nr); 1483 unregister_proto: 1484 proto_unregister(&nr_proto); 1485 return rc; 1486 } 1487 1488 module_init(nr_proto_init); 1489 1490 module_param(nr_ndevs, int, 0); 1491 MODULE_PARM_DESC(nr_ndevs, "number of NET/ROM devices"); 1492 1493 MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>"); 1494 MODULE_DESCRIPTION("The amateur radio NET/ROM network and transport layer protocol"); 1495 MODULE_LICENSE("GPL"); 1496 MODULE_ALIAS_NETPROTO(PF_NETROM); 1497 1498 static void __exit nr_exit(void) 1499 { 1500 int i; 1501 1502 remove_proc_entry("nr", init_net.proc_net); 1503 remove_proc_entry("nr_neigh", init_net.proc_net); 1504 remove_proc_entry("nr_nodes", init_net.proc_net); 1505 nr_loopback_clear(); 1506 1507 nr_rt_free(); 1508 1509 #ifdef CONFIG_SYSCTL 1510 nr_unregister_sysctl(); 1511 #endif 1512 1513 ax25_linkfail_release(&nr_linkfail_notifier); 1514 ax25_protocol_release(AX25_P_NETROM); 1515 1516 unregister_netdevice_notifier(&nr_dev_notifier); 1517 1518 sock_unregister(PF_NETROM); 1519 1520 for (i = 0; i < nr_ndevs; i++) { 1521 struct net_device *dev = dev_nr[i]; 1522 if (dev) { 1523 unregister_netdev(dev); 1524 free_netdev(dev); 1525 } 1526 } 1527 1528 kfree(dev_nr); 1529 proto_unregister(&nr_proto); 1530 } 1531 module_exit(nr_exit); 1532