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 static struct lock_class_key nr_netdev_addr_lock_key; 77 78 static void nr_set_lockdep_one(struct net_device *dev, 79 struct netdev_queue *txq, 80 void *_unused) 81 { 82 lockdep_set_class(&txq->_xmit_lock, &nr_netdev_xmit_lock_key); 83 } 84 85 static void nr_set_lockdep_key(struct net_device *dev) 86 { 87 lockdep_set_class(&dev->addr_list_lock, &nr_netdev_addr_lock_key); 88 netdev_for_each_tx_queue(dev, nr_set_lockdep_one, NULL); 89 } 90 91 /* 92 * Socket removal during an interrupt is now safe. 93 */ 94 static void nr_remove_socket(struct sock *sk) 95 { 96 spin_lock_bh(&nr_list_lock); 97 sk_del_node_init(sk); 98 spin_unlock_bh(&nr_list_lock); 99 } 100 101 /* 102 * Kill all bound sockets on a dropped device. 103 */ 104 static void nr_kill_by_device(struct net_device *dev) 105 { 106 struct sock *s; 107 struct hlist_node *node; 108 109 spin_lock_bh(&nr_list_lock); 110 sk_for_each(s, node, &nr_list) 111 if (nr_sk(s)->device == dev) 112 nr_disconnect(s, ENETUNREACH); 113 spin_unlock_bh(&nr_list_lock); 114 } 115 116 /* 117 * Handle device status changes. 118 */ 119 static int nr_device_event(struct notifier_block *this, unsigned long event, void *ptr) 120 { 121 struct net_device *dev = (struct net_device *)ptr; 122 123 if (!net_eq(dev_net(dev), &init_net)) 124 return NOTIFY_DONE; 125 126 if (event != NETDEV_DOWN) 127 return NOTIFY_DONE; 128 129 nr_kill_by_device(dev); 130 nr_rt_device_down(dev); 131 132 return NOTIFY_DONE; 133 } 134 135 /* 136 * Add a socket to the bound sockets list. 137 */ 138 static void nr_insert_socket(struct sock *sk) 139 { 140 spin_lock_bh(&nr_list_lock); 141 sk_add_node(sk, &nr_list); 142 spin_unlock_bh(&nr_list_lock); 143 } 144 145 /* 146 * Find a socket that wants to accept the Connect Request we just 147 * received. 148 */ 149 static struct sock *nr_find_listener(ax25_address *addr) 150 { 151 struct sock *s; 152 struct hlist_node *node; 153 154 spin_lock_bh(&nr_list_lock); 155 sk_for_each(s, node, &nr_list) 156 if (!ax25cmp(&nr_sk(s)->source_addr, addr) && 157 s->sk_state == TCP_LISTEN) { 158 bh_lock_sock(s); 159 goto found; 160 } 161 s = NULL; 162 found: 163 spin_unlock_bh(&nr_list_lock); 164 return s; 165 } 166 167 /* 168 * Find a connected NET/ROM socket given my circuit IDs. 169 */ 170 static struct sock *nr_find_socket(unsigned char index, unsigned char id) 171 { 172 struct sock *s; 173 struct hlist_node *node; 174 175 spin_lock_bh(&nr_list_lock); 176 sk_for_each(s, node, &nr_list) { 177 struct nr_sock *nr = nr_sk(s); 178 179 if (nr->my_index == index && nr->my_id == id) { 180 bh_lock_sock(s); 181 goto found; 182 } 183 } 184 s = NULL; 185 found: 186 spin_unlock_bh(&nr_list_lock); 187 return s; 188 } 189 190 /* 191 * Find a connected NET/ROM socket given their circuit IDs. 192 */ 193 static struct sock *nr_find_peer(unsigned char index, unsigned char id, 194 ax25_address *dest) 195 { 196 struct sock *s; 197 struct hlist_node *node; 198 199 spin_lock_bh(&nr_list_lock); 200 sk_for_each(s, node, &nr_list) { 201 struct nr_sock *nr = nr_sk(s); 202 203 if (nr->your_index == index && nr->your_id == id && 204 !ax25cmp(&nr->dest_addr, dest)) { 205 bh_lock_sock(s); 206 goto found; 207 } 208 } 209 s = NULL; 210 found: 211 spin_unlock_bh(&nr_list_lock); 212 return s; 213 } 214 215 /* 216 * Find next free circuit ID. 217 */ 218 static unsigned short nr_find_next_circuit(void) 219 { 220 unsigned short id = circuit; 221 unsigned char i, j; 222 struct sock *sk; 223 224 for (;;) { 225 i = id / 256; 226 j = id % 256; 227 228 if (i != 0 && j != 0) { 229 if ((sk=nr_find_socket(i, j)) == NULL) 230 break; 231 bh_unlock_sock(sk); 232 } 233 234 id++; 235 } 236 237 return id; 238 } 239 240 /* 241 * Deferred destroy. 242 */ 243 void nr_destroy_socket(struct sock *); 244 245 /* 246 * Handler for deferred kills. 247 */ 248 static void nr_destroy_timer(unsigned long data) 249 { 250 struct sock *sk=(struct sock *)data; 251 bh_lock_sock(sk); 252 sock_hold(sk); 253 nr_destroy_socket(sk); 254 bh_unlock_sock(sk); 255 sock_put(sk); 256 } 257 258 /* 259 * This is called from user mode and the timers. Thus it protects itself 260 * against interrupt users but doesn't worry about being called during 261 * work. Once it is removed from the queue no interrupt or bottom half 262 * will touch it and we are (fairly 8-) ) safe. 263 */ 264 void nr_destroy_socket(struct sock *sk) 265 { 266 struct sk_buff *skb; 267 268 nr_remove_socket(sk); 269 270 nr_stop_heartbeat(sk); 271 nr_stop_t1timer(sk); 272 nr_stop_t2timer(sk); 273 nr_stop_t4timer(sk); 274 nr_stop_idletimer(sk); 275 276 nr_clear_queues(sk); /* Flush the queues */ 277 278 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { 279 if (skb->sk != sk) { /* A pending connection */ 280 /* Queue the unaccepted socket for death */ 281 sock_set_flag(skb->sk, SOCK_DEAD); 282 nr_start_heartbeat(skb->sk); 283 nr_sk(skb->sk)->state = NR_STATE_0; 284 } 285 286 kfree_skb(skb); 287 } 288 289 if (sk_has_allocations(sk)) { 290 /* Defer: outstanding buffers */ 291 sk->sk_timer.function = nr_destroy_timer; 292 sk->sk_timer.expires = jiffies + 2 * HZ; 293 add_timer(&sk->sk_timer); 294 } else 295 sock_put(sk); 296 } 297 298 /* 299 * Handling for system calls applied via the various interfaces to a 300 * NET/ROM socket object. 301 */ 302 303 static int nr_setsockopt(struct socket *sock, int level, int optname, 304 char __user *optval, unsigned int optlen) 305 { 306 struct sock *sk = sock->sk; 307 struct nr_sock *nr = nr_sk(sk); 308 int opt; 309 310 if (level != SOL_NETROM) 311 return -ENOPROTOOPT; 312 313 if (optlen < sizeof(int)) 314 return -EINVAL; 315 316 if (get_user(opt, (int __user *)optval)) 317 return -EFAULT; 318 319 switch (optname) { 320 case NETROM_T1: 321 if (opt < 1) 322 return -EINVAL; 323 nr->t1 = opt * HZ; 324 return 0; 325 326 case NETROM_T2: 327 if (opt < 1) 328 return -EINVAL; 329 nr->t2 = opt * HZ; 330 return 0; 331 332 case NETROM_N2: 333 if (opt < 1 || opt > 31) 334 return -EINVAL; 335 nr->n2 = opt; 336 return 0; 337 338 case NETROM_T4: 339 if (opt < 1) 340 return -EINVAL; 341 nr->t4 = opt * HZ; 342 return 0; 343 344 case NETROM_IDLE: 345 if (opt < 0) 346 return -EINVAL; 347 nr->idle = opt * 60 * HZ; 348 return 0; 349 350 default: 351 return -ENOPROTOOPT; 352 } 353 } 354 355 static int nr_getsockopt(struct socket *sock, int level, int optname, 356 char __user *optval, int __user *optlen) 357 { 358 struct sock *sk = sock->sk; 359 struct nr_sock *nr = nr_sk(sk); 360 int val = 0; 361 int len; 362 363 if (level != SOL_NETROM) 364 return -ENOPROTOOPT; 365 366 if (get_user(len, optlen)) 367 return -EFAULT; 368 369 if (len < 0) 370 return -EINVAL; 371 372 switch (optname) { 373 case NETROM_T1: 374 val = nr->t1 / HZ; 375 break; 376 377 case NETROM_T2: 378 val = nr->t2 / HZ; 379 break; 380 381 case NETROM_N2: 382 val = nr->n2; 383 break; 384 385 case NETROM_T4: 386 val = nr->t4 / HZ; 387 break; 388 389 case NETROM_IDLE: 390 val = nr->idle / (60 * HZ); 391 break; 392 393 default: 394 return -ENOPROTOOPT; 395 } 396 397 len = min_t(unsigned int, len, sizeof(int)); 398 399 if (put_user(len, optlen)) 400 return -EFAULT; 401 402 return copy_to_user(optval, &val, len) ? -EFAULT : 0; 403 } 404 405 static int nr_listen(struct socket *sock, int backlog) 406 { 407 struct sock *sk = sock->sk; 408 409 lock_sock(sk); 410 if (sk->sk_state != TCP_LISTEN) { 411 memset(&nr_sk(sk)->user_addr, 0, AX25_ADDR_LEN); 412 sk->sk_max_ack_backlog = backlog; 413 sk->sk_state = TCP_LISTEN; 414 release_sock(sk); 415 return 0; 416 } 417 release_sock(sk); 418 419 return -EOPNOTSUPP; 420 } 421 422 static struct proto nr_proto = { 423 .name = "NETROM", 424 .owner = THIS_MODULE, 425 .obj_size = sizeof(struct nr_sock), 426 }; 427 428 static int nr_create(struct net *net, struct socket *sock, int protocol, 429 int kern) 430 { 431 struct sock *sk; 432 struct nr_sock *nr; 433 434 if (!net_eq(net, &init_net)) 435 return -EAFNOSUPPORT; 436 437 if (sock->type != SOCK_SEQPACKET || protocol != 0) 438 return -ESOCKTNOSUPPORT; 439 440 sk = sk_alloc(net, PF_NETROM, GFP_ATOMIC, &nr_proto); 441 if (sk == NULL) 442 return -ENOMEM; 443 444 nr = nr_sk(sk); 445 446 sock_init_data(sock, sk); 447 448 sock->ops = &nr_proto_ops; 449 sk->sk_protocol = protocol; 450 451 skb_queue_head_init(&nr->ack_queue); 452 skb_queue_head_init(&nr->reseq_queue); 453 skb_queue_head_init(&nr->frag_queue); 454 455 nr_init_timers(sk); 456 457 nr->t1 = 458 msecs_to_jiffies(sysctl_netrom_transport_timeout); 459 nr->t2 = 460 msecs_to_jiffies(sysctl_netrom_transport_acknowledge_delay); 461 nr->n2 = 462 msecs_to_jiffies(sysctl_netrom_transport_maximum_tries); 463 nr->t4 = 464 msecs_to_jiffies(sysctl_netrom_transport_busy_delay); 465 nr->idle = 466 msecs_to_jiffies(sysctl_netrom_transport_no_activity_timeout); 467 nr->window = sysctl_netrom_transport_requested_window_size; 468 469 nr->bpqext = 1; 470 nr->state = NR_STATE_0; 471 472 return 0; 473 } 474 475 static struct sock *nr_make_new(struct sock *osk) 476 { 477 struct sock *sk; 478 struct nr_sock *nr, *onr; 479 480 if (osk->sk_type != SOCK_SEQPACKET) 481 return NULL; 482 483 sk = sk_alloc(sock_net(osk), PF_NETROM, GFP_ATOMIC, osk->sk_prot); 484 if (sk == NULL) 485 return NULL; 486 487 nr = nr_sk(sk); 488 489 sock_init_data(NULL, sk); 490 491 sk->sk_type = osk->sk_type; 492 sk->sk_priority = osk->sk_priority; 493 sk->sk_protocol = osk->sk_protocol; 494 sk->sk_rcvbuf = osk->sk_rcvbuf; 495 sk->sk_sndbuf = osk->sk_sndbuf; 496 sk->sk_state = TCP_ESTABLISHED; 497 sock_copy_flags(sk, osk); 498 499 skb_queue_head_init(&nr->ack_queue); 500 skb_queue_head_init(&nr->reseq_queue); 501 skb_queue_head_init(&nr->frag_queue); 502 503 nr_init_timers(sk); 504 505 onr = nr_sk(osk); 506 507 nr->t1 = onr->t1; 508 nr->t2 = onr->t2; 509 nr->n2 = onr->n2; 510 nr->t4 = onr->t4; 511 nr->idle = onr->idle; 512 nr->window = onr->window; 513 514 nr->device = onr->device; 515 nr->bpqext = onr->bpqext; 516 517 return sk; 518 } 519 520 static int nr_release(struct socket *sock) 521 { 522 struct sock *sk = sock->sk; 523 struct nr_sock *nr; 524 525 if (sk == NULL) return 0; 526 527 sock_hold(sk); 528 sock_orphan(sk); 529 lock_sock(sk); 530 nr = nr_sk(sk); 531 532 switch (nr->state) { 533 case NR_STATE_0: 534 case NR_STATE_1: 535 case NR_STATE_2: 536 nr_disconnect(sk, 0); 537 nr_destroy_socket(sk); 538 break; 539 540 case NR_STATE_3: 541 nr_clear_queues(sk); 542 nr->n2count = 0; 543 nr_write_internal(sk, NR_DISCREQ); 544 nr_start_t1timer(sk); 545 nr_stop_t2timer(sk); 546 nr_stop_t4timer(sk); 547 nr_stop_idletimer(sk); 548 nr->state = NR_STATE_2; 549 sk->sk_state = TCP_CLOSE; 550 sk->sk_shutdown |= SEND_SHUTDOWN; 551 sk->sk_state_change(sk); 552 sock_set_flag(sk, SOCK_DESTROY); 553 break; 554 555 default: 556 break; 557 } 558 559 sock->sk = NULL; 560 release_sock(sk); 561 sock_put(sk); 562 563 return 0; 564 } 565 566 static int nr_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 567 { 568 struct sock *sk = sock->sk; 569 struct nr_sock *nr = nr_sk(sk); 570 struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr; 571 struct net_device *dev; 572 ax25_uid_assoc *user; 573 ax25_address *source; 574 575 lock_sock(sk); 576 if (!sock_flag(sk, SOCK_ZAPPED)) { 577 release_sock(sk); 578 return -EINVAL; 579 } 580 if (addr_len < sizeof(struct sockaddr_ax25) || addr_len > sizeof(struct full_sockaddr_ax25)) { 581 release_sock(sk); 582 return -EINVAL; 583 } 584 if (addr_len < (addr->fsa_ax25.sax25_ndigis * sizeof(ax25_address) + sizeof(struct sockaddr_ax25))) { 585 release_sock(sk); 586 return -EINVAL; 587 } 588 if (addr->fsa_ax25.sax25_family != AF_NETROM) { 589 release_sock(sk); 590 return -EINVAL; 591 } 592 if ((dev = nr_dev_get(&addr->fsa_ax25.sax25_call)) == NULL) { 593 SOCK_DEBUG(sk, "NET/ROM: bind failed: invalid node callsign\n"); 594 release_sock(sk); 595 return -EADDRNOTAVAIL; 596 } 597 598 /* 599 * Only the super user can set an arbitrary user callsign. 600 */ 601 if (addr->fsa_ax25.sax25_ndigis == 1) { 602 if (!capable(CAP_NET_BIND_SERVICE)) { 603 dev_put(dev); 604 release_sock(sk); 605 return -EACCES; 606 } 607 nr->user_addr = addr->fsa_digipeater[0]; 608 nr->source_addr = addr->fsa_ax25.sax25_call; 609 } else { 610 source = &addr->fsa_ax25.sax25_call; 611 612 user = ax25_findbyuid(current_euid()); 613 if (user) { 614 nr->user_addr = user->call; 615 ax25_uid_put(user); 616 } else { 617 if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) { 618 release_sock(sk); 619 dev_put(dev); 620 return -EPERM; 621 } 622 nr->user_addr = *source; 623 } 624 625 nr->source_addr = *source; 626 } 627 628 nr->device = dev; 629 nr_insert_socket(sk); 630 631 sock_reset_flag(sk, SOCK_ZAPPED); 632 dev_put(dev); 633 release_sock(sk); 634 SOCK_DEBUG(sk, "NET/ROM: socket is bound\n"); 635 return 0; 636 } 637 638 static int nr_connect(struct socket *sock, struct sockaddr *uaddr, 639 int addr_len, int flags) 640 { 641 struct sock *sk = sock->sk; 642 struct nr_sock *nr = nr_sk(sk); 643 struct sockaddr_ax25 *addr = (struct sockaddr_ax25 *)uaddr; 644 ax25_address *source = NULL; 645 ax25_uid_assoc *user; 646 struct net_device *dev; 647 int err = 0; 648 649 lock_sock(sk); 650 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) { 651 sock->state = SS_CONNECTED; 652 goto out_release; /* Connect completed during a ERESTARTSYS event */ 653 } 654 655 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) { 656 sock->state = SS_UNCONNECTED; 657 err = -ECONNREFUSED; 658 goto out_release; 659 } 660 661 if (sk->sk_state == TCP_ESTABLISHED) { 662 err = -EISCONN; /* No reconnect on a seqpacket socket */ 663 goto out_release; 664 } 665 666 sk->sk_state = TCP_CLOSE; 667 sock->state = SS_UNCONNECTED; 668 669 if (addr_len != sizeof(struct sockaddr_ax25) && addr_len != sizeof(struct full_sockaddr_ax25)) { 670 err = -EINVAL; 671 goto out_release; 672 } 673 if (addr->sax25_family != AF_NETROM) { 674 err = -EINVAL; 675 goto out_release; 676 } 677 if (sock_flag(sk, SOCK_ZAPPED)) { /* Must bind first - autobinding in this may or may not work */ 678 sock_reset_flag(sk, SOCK_ZAPPED); 679 680 if ((dev = nr_dev_first()) == NULL) { 681 err = -ENETUNREACH; 682 goto out_release; 683 } 684 source = (ax25_address *)dev->dev_addr; 685 686 user = ax25_findbyuid(current_euid()); 687 if (user) { 688 nr->user_addr = user->call; 689 ax25_uid_put(user); 690 } else { 691 if (ax25_uid_policy && !capable(CAP_NET_ADMIN)) { 692 dev_put(dev); 693 err = -EPERM; 694 goto out_release; 695 } 696 nr->user_addr = *source; 697 } 698 699 nr->source_addr = *source; 700 nr->device = dev; 701 702 dev_put(dev); 703 nr_insert_socket(sk); /* Finish the bind */ 704 } 705 706 nr->dest_addr = addr->sax25_call; 707 708 release_sock(sk); 709 circuit = nr_find_next_circuit(); 710 lock_sock(sk); 711 712 nr->my_index = circuit / 256; 713 nr->my_id = circuit % 256; 714 715 circuit++; 716 717 /* Move to connecting socket, start sending Connect Requests */ 718 sock->state = SS_CONNECTING; 719 sk->sk_state = TCP_SYN_SENT; 720 721 nr_establish_data_link(sk); 722 723 nr->state = NR_STATE_1; 724 725 nr_start_heartbeat(sk); 726 727 /* Now the loop */ 728 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) { 729 err = -EINPROGRESS; 730 goto out_release; 731 } 732 733 /* 734 * A Connect Ack with Choke or timeout or failed routing will go to 735 * closed. 736 */ 737 if (sk->sk_state == TCP_SYN_SENT) { 738 DEFINE_WAIT(wait); 739 740 for (;;) { 741 prepare_to_wait(sk->sk_sleep, &wait, 742 TASK_INTERRUPTIBLE); 743 if (sk->sk_state != TCP_SYN_SENT) 744 break; 745 if (!signal_pending(current)) { 746 release_sock(sk); 747 schedule(); 748 lock_sock(sk); 749 continue; 750 } 751 err = -ERESTARTSYS; 752 break; 753 } 754 finish_wait(sk->sk_sleep, &wait); 755 if (err) 756 goto out_release; 757 } 758 759 if (sk->sk_state != TCP_ESTABLISHED) { 760 sock->state = SS_UNCONNECTED; 761 err = sock_error(sk); /* Always set at this point */ 762 goto out_release; 763 } 764 765 sock->state = SS_CONNECTED; 766 767 out_release: 768 release_sock(sk); 769 770 return err; 771 } 772 773 static int nr_accept(struct socket *sock, struct socket *newsock, int flags) 774 { 775 struct sk_buff *skb; 776 struct sock *newsk; 777 DEFINE_WAIT(wait); 778 struct sock *sk; 779 int err = 0; 780 781 if ((sk = sock->sk) == NULL) 782 return -EINVAL; 783 784 lock_sock(sk); 785 if (sk->sk_type != SOCK_SEQPACKET) { 786 err = -EOPNOTSUPP; 787 goto out_release; 788 } 789 790 if (sk->sk_state != TCP_LISTEN) { 791 err = -EINVAL; 792 goto out_release; 793 } 794 795 /* 796 * The write queue this time is holding sockets ready to use 797 * hooked into the SABM we saved 798 */ 799 for (;;) { 800 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 801 skb = skb_dequeue(&sk->sk_receive_queue); 802 if (skb) 803 break; 804 805 if (flags & O_NONBLOCK) { 806 err = -EWOULDBLOCK; 807 break; 808 } 809 if (!signal_pending(current)) { 810 release_sock(sk); 811 schedule(); 812 lock_sock(sk); 813 continue; 814 } 815 err = -ERESTARTSYS; 816 break; 817 } 818 finish_wait(sk->sk_sleep, &wait); 819 if (err) 820 goto out_release; 821 822 newsk = skb->sk; 823 sock_graft(newsk, newsock); 824 825 /* Now attach up the new socket */ 826 kfree_skb(skb); 827 sk_acceptq_removed(sk); 828 829 out_release: 830 release_sock(sk); 831 832 return err; 833 } 834 835 static int nr_getname(struct socket *sock, struct sockaddr *uaddr, 836 int *uaddr_len, int peer) 837 { 838 struct full_sockaddr_ax25 *sax = (struct full_sockaddr_ax25 *)uaddr; 839 struct sock *sk = sock->sk; 840 struct nr_sock *nr = nr_sk(sk); 841 842 lock_sock(sk); 843 if (peer != 0) { 844 if (sk->sk_state != TCP_ESTABLISHED) { 845 release_sock(sk); 846 return -ENOTCONN; 847 } 848 sax->fsa_ax25.sax25_family = AF_NETROM; 849 sax->fsa_ax25.sax25_ndigis = 1; 850 sax->fsa_ax25.sax25_call = nr->user_addr; 851 memset(sax->fsa_digipeater, 0, sizeof(sax->fsa_digipeater)); 852 sax->fsa_digipeater[0] = nr->dest_addr; 853 *uaddr_len = sizeof(struct full_sockaddr_ax25); 854 } else { 855 sax->fsa_ax25.sax25_family = AF_NETROM; 856 sax->fsa_ax25.sax25_ndigis = 0; 857 sax->fsa_ax25.sax25_call = nr->source_addr; 858 *uaddr_len = sizeof(struct sockaddr_ax25); 859 } 860 release_sock(sk); 861 862 return 0; 863 } 864 865 int nr_rx_frame(struct sk_buff *skb, struct net_device *dev) 866 { 867 struct sock *sk; 868 struct sock *make; 869 struct nr_sock *nr_make; 870 ax25_address *src, *dest, *user; 871 unsigned short circuit_index, circuit_id; 872 unsigned short peer_circuit_index, peer_circuit_id; 873 unsigned short frametype, flags, window, timeout; 874 int ret; 875 876 skb->sk = NULL; /* Initially we don't know who it's for */ 877 878 /* 879 * skb->data points to the netrom frame start 880 */ 881 882 src = (ax25_address *)(skb->data + 0); 883 dest = (ax25_address *)(skb->data + 7); 884 885 circuit_index = skb->data[15]; 886 circuit_id = skb->data[16]; 887 peer_circuit_index = skb->data[17]; 888 peer_circuit_id = skb->data[18]; 889 frametype = skb->data[19] & 0x0F; 890 flags = skb->data[19] & 0xF0; 891 892 /* 893 * Check for an incoming IP over NET/ROM frame. 894 */ 895 if (frametype == NR_PROTOEXT && 896 circuit_index == NR_PROTO_IP && circuit_id == NR_PROTO_IP) { 897 skb_pull(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN); 898 skb_reset_transport_header(skb); 899 900 return nr_rx_ip(skb, dev); 901 } 902 903 /* 904 * Find an existing socket connection, based on circuit ID, if it's 905 * a Connect Request base it on their circuit ID. 906 * 907 * Circuit ID 0/0 is not valid but it could still be a "reset" for a 908 * circuit that no longer exists at the other end ... 909 */ 910 911 sk = NULL; 912 913 if (circuit_index == 0 && circuit_id == 0) { 914 if (frametype == NR_CONNACK && flags == NR_CHOKE_FLAG) 915 sk = nr_find_peer(peer_circuit_index, peer_circuit_id, src); 916 } else { 917 if (frametype == NR_CONNREQ) 918 sk = nr_find_peer(circuit_index, circuit_id, src); 919 else 920 sk = nr_find_socket(circuit_index, circuit_id); 921 } 922 923 if (sk != NULL) { 924 skb_reset_transport_header(skb); 925 926 if (frametype == NR_CONNACK && skb->len == 22) 927 nr_sk(sk)->bpqext = 1; 928 else 929 nr_sk(sk)->bpqext = 0; 930 931 ret = nr_process_rx_frame(sk, skb); 932 bh_unlock_sock(sk); 933 return ret; 934 } 935 936 /* 937 * Now it should be a CONNREQ. 938 */ 939 if (frametype != NR_CONNREQ) { 940 /* 941 * Here it would be nice to be able to send a reset but 942 * NET/ROM doesn't have one. We've tried to extend the protocol 943 * by sending NR_CONNACK | NR_CHOKE_FLAGS replies but that 944 * apparently kills BPQ boxes... :-( 945 * So now we try to follow the established behaviour of 946 * G8PZT's Xrouter which is sending packets with command type 7 947 * as an extension of the protocol. 948 */ 949 if (sysctl_netrom_reset_circuit && 950 (frametype != NR_RESET || flags != 0)) 951 nr_transmit_reset(skb, 1); 952 953 return 0; 954 } 955 956 sk = nr_find_listener(dest); 957 958 user = (ax25_address *)(skb->data + 21); 959 960 if (sk == NULL || sk_acceptq_is_full(sk) || 961 (make = nr_make_new(sk)) == NULL) { 962 nr_transmit_refusal(skb, 0); 963 if (sk) 964 bh_unlock_sock(sk); 965 return 0; 966 } 967 968 window = skb->data[20]; 969 970 skb->sk = make; 971 make->sk_state = TCP_ESTABLISHED; 972 973 /* Fill in his circuit details */ 974 nr_make = nr_sk(make); 975 nr_make->source_addr = *dest; 976 nr_make->dest_addr = *src; 977 nr_make->user_addr = *user; 978 979 nr_make->your_index = circuit_index; 980 nr_make->your_id = circuit_id; 981 982 bh_unlock_sock(sk); 983 circuit = nr_find_next_circuit(); 984 bh_lock_sock(sk); 985 986 nr_make->my_index = circuit / 256; 987 nr_make->my_id = circuit % 256; 988 989 circuit++; 990 991 /* Window negotiation */ 992 if (window < nr_make->window) 993 nr_make->window = window; 994 995 /* L4 timeout negotiation */ 996 if (skb->len == 37) { 997 timeout = skb->data[36] * 256 + skb->data[35]; 998 if (timeout * HZ < nr_make->t1) 999 nr_make->t1 = timeout * HZ; 1000 nr_make->bpqext = 1; 1001 } else { 1002 nr_make->bpqext = 0; 1003 } 1004 1005 nr_write_internal(make, NR_CONNACK); 1006 1007 nr_make->condition = 0x00; 1008 nr_make->vs = 0; 1009 nr_make->va = 0; 1010 nr_make->vr = 0; 1011 nr_make->vl = 0; 1012 nr_make->state = NR_STATE_3; 1013 sk_acceptq_added(sk); 1014 skb_queue_head(&sk->sk_receive_queue, skb); 1015 1016 if (!sock_flag(sk, SOCK_DEAD)) 1017 sk->sk_data_ready(sk, skb->len); 1018 1019 bh_unlock_sock(sk); 1020 1021 nr_insert_socket(make); 1022 1023 nr_start_heartbeat(make); 1024 nr_start_idletimer(make); 1025 1026 return 1; 1027 } 1028 1029 static int nr_sendmsg(struct kiocb *iocb, struct socket *sock, 1030 struct msghdr *msg, size_t len) 1031 { 1032 struct sock *sk = sock->sk; 1033 struct nr_sock *nr = nr_sk(sk); 1034 struct sockaddr_ax25 *usax = (struct sockaddr_ax25 *)msg->msg_name; 1035 int err; 1036 struct sockaddr_ax25 sax; 1037 struct sk_buff *skb; 1038 unsigned char *asmptr; 1039 int size; 1040 1041 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT)) 1042 return -EINVAL; 1043 1044 lock_sock(sk); 1045 if (sock_flag(sk, SOCK_ZAPPED)) { 1046 err = -EADDRNOTAVAIL; 1047 goto out; 1048 } 1049 1050 if (sk->sk_shutdown & SEND_SHUTDOWN) { 1051 send_sig(SIGPIPE, current, 0); 1052 err = -EPIPE; 1053 goto out; 1054 } 1055 1056 if (nr->device == NULL) { 1057 err = -ENETUNREACH; 1058 goto out; 1059 } 1060 1061 if (usax) { 1062 if (msg->msg_namelen < sizeof(sax)) { 1063 err = -EINVAL; 1064 goto out; 1065 } 1066 sax = *usax; 1067 if (ax25cmp(&nr->dest_addr, &sax.sax25_call) != 0) { 1068 err = -EISCONN; 1069 goto out; 1070 } 1071 if (sax.sax25_family != AF_NETROM) { 1072 err = -EINVAL; 1073 goto out; 1074 } 1075 } else { 1076 if (sk->sk_state != TCP_ESTABLISHED) { 1077 err = -ENOTCONN; 1078 goto out; 1079 } 1080 sax.sax25_family = AF_NETROM; 1081 sax.sax25_call = nr->dest_addr; 1082 } 1083 1084 SOCK_DEBUG(sk, "NET/ROM: sendto: Addresses built.\n"); 1085 1086 /* Build a packet - the conventional user limit is 236 bytes. We can 1087 do ludicrously large NetROM frames but must not overflow */ 1088 if (len > 65536) { 1089 err = -EMSGSIZE; 1090 goto out; 1091 } 1092 1093 SOCK_DEBUG(sk, "NET/ROM: sendto: building packet.\n"); 1094 size = len + NR_NETWORK_LEN + NR_TRANSPORT_LEN; 1095 1096 if ((skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL) 1097 goto out; 1098 1099 skb_reserve(skb, size - len); 1100 skb_reset_transport_header(skb); 1101 1102 /* 1103 * Push down the NET/ROM header 1104 */ 1105 1106 asmptr = skb_push(skb, NR_TRANSPORT_LEN); 1107 SOCK_DEBUG(sk, "Building NET/ROM Header.\n"); 1108 1109 /* Build a NET/ROM Transport header */ 1110 1111 *asmptr++ = nr->your_index; 1112 *asmptr++ = nr->your_id; 1113 *asmptr++ = 0; /* To be filled in later */ 1114 *asmptr++ = 0; /* Ditto */ 1115 *asmptr++ = NR_INFO; 1116 SOCK_DEBUG(sk, "Built header.\n"); 1117 1118 /* 1119 * Put the data on the end 1120 */ 1121 skb_put(skb, len); 1122 1123 SOCK_DEBUG(sk, "NET/ROM: Appending user data\n"); 1124 1125 /* User data follows immediately after the NET/ROM transport header */ 1126 if (memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len)) { 1127 kfree_skb(skb); 1128 err = -EFAULT; 1129 goto out; 1130 } 1131 1132 SOCK_DEBUG(sk, "NET/ROM: Transmitting buffer\n"); 1133 1134 if (sk->sk_state != TCP_ESTABLISHED) { 1135 kfree_skb(skb); 1136 err = -ENOTCONN; 1137 goto out; 1138 } 1139 1140 nr_output(sk, skb); /* Shove it onto the queue */ 1141 1142 err = len; 1143 out: 1144 release_sock(sk); 1145 return err; 1146 } 1147 1148 static int nr_recvmsg(struct kiocb *iocb, struct socket *sock, 1149 struct msghdr *msg, size_t size, int flags) 1150 { 1151 struct sock *sk = sock->sk; 1152 struct sockaddr_ax25 *sax = (struct sockaddr_ax25 *)msg->msg_name; 1153 size_t copied; 1154 struct sk_buff *skb; 1155 int er; 1156 1157 /* 1158 * This works for seqpacket too. The receiver has ordered the queue for 1159 * us! We do one quick check first though 1160 */ 1161 1162 lock_sock(sk); 1163 if (sk->sk_state != TCP_ESTABLISHED) { 1164 release_sock(sk); 1165 return -ENOTCONN; 1166 } 1167 1168 /* Now we can treat all alike */ 1169 if ((skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, flags & MSG_DONTWAIT, &er)) == NULL) { 1170 release_sock(sk); 1171 return er; 1172 } 1173 1174 skb_reset_transport_header(skb); 1175 copied = skb->len; 1176 1177 if (copied > size) { 1178 copied = size; 1179 msg->msg_flags |= MSG_TRUNC; 1180 } 1181 1182 skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 1183 1184 if (sax != NULL) { 1185 sax->sax25_family = AF_NETROM; 1186 skb_copy_from_linear_data_offset(skb, 7, sax->sax25_call.ax25_call, 1187 AX25_ADDR_LEN); 1188 } 1189 1190 msg->msg_namelen = sizeof(*sax); 1191 1192 skb_free_datagram(sk, skb); 1193 1194 release_sock(sk); 1195 return copied; 1196 } 1197 1198 1199 static int nr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1200 { 1201 struct sock *sk = sock->sk; 1202 void __user *argp = (void __user *)arg; 1203 int ret; 1204 1205 switch (cmd) { 1206 case TIOCOUTQ: { 1207 long amount; 1208 1209 lock_sock(sk); 1210 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk); 1211 if (amount < 0) 1212 amount = 0; 1213 release_sock(sk); 1214 return put_user(amount, (int __user *)argp); 1215 } 1216 1217 case TIOCINQ: { 1218 struct sk_buff *skb; 1219 long amount = 0L; 1220 1221 lock_sock(sk); 1222 /* These two are safe on a single CPU system as only user tasks fiddle here */ 1223 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) 1224 amount = skb->len; 1225 release_sock(sk); 1226 return put_user(amount, (int __user *)argp); 1227 } 1228 1229 case SIOCGSTAMP: 1230 lock_sock(sk); 1231 ret = sock_get_timestamp(sk, argp); 1232 release_sock(sk); 1233 return ret; 1234 1235 case SIOCGSTAMPNS: 1236 lock_sock(sk); 1237 ret = sock_get_timestampns(sk, argp); 1238 release_sock(sk); 1239 return ret; 1240 1241 case SIOCGIFADDR: 1242 case SIOCSIFADDR: 1243 case SIOCGIFDSTADDR: 1244 case SIOCSIFDSTADDR: 1245 case SIOCGIFBRDADDR: 1246 case SIOCSIFBRDADDR: 1247 case SIOCGIFNETMASK: 1248 case SIOCSIFNETMASK: 1249 case SIOCGIFMETRIC: 1250 case SIOCSIFMETRIC: 1251 return -EINVAL; 1252 1253 case SIOCADDRT: 1254 case SIOCDELRT: 1255 case SIOCNRDECOBS: 1256 if (!capable(CAP_NET_ADMIN)) return -EPERM; 1257 return nr_rt_ioctl(cmd, argp); 1258 1259 default: 1260 return -ENOIOCTLCMD; 1261 } 1262 1263 return 0; 1264 } 1265 1266 #ifdef CONFIG_PROC_FS 1267 1268 static void *nr_info_start(struct seq_file *seq, loff_t *pos) 1269 { 1270 struct sock *s; 1271 struct hlist_node *node; 1272 int i = 1; 1273 1274 spin_lock_bh(&nr_list_lock); 1275 if (*pos == 0) 1276 return SEQ_START_TOKEN; 1277 1278 sk_for_each(s, node, &nr_list) { 1279 if (i == *pos) 1280 return s; 1281 ++i; 1282 } 1283 return NULL; 1284 } 1285 1286 static void *nr_info_next(struct seq_file *seq, void *v, loff_t *pos) 1287 { 1288 ++*pos; 1289 1290 return (v == SEQ_START_TOKEN) ? sk_head(&nr_list) 1291 : sk_next((struct sock *)v); 1292 } 1293 1294 static void nr_info_stop(struct seq_file *seq, void *v) 1295 { 1296 spin_unlock_bh(&nr_list_lock); 1297 } 1298 1299 static int nr_info_show(struct seq_file *seq, void *v) 1300 { 1301 struct sock *s = v; 1302 struct net_device *dev; 1303 struct nr_sock *nr; 1304 const char *devname; 1305 char buf[11]; 1306 1307 if (v == SEQ_START_TOKEN) 1308 seq_puts(seq, 1309 "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"); 1310 1311 else { 1312 1313 bh_lock_sock(s); 1314 nr = nr_sk(s); 1315 1316 if ((dev = nr->device) == NULL) 1317 devname = "???"; 1318 else 1319 devname = dev->name; 1320 1321 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->user_addr)); 1322 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->dest_addr)); 1323 seq_printf(seq, 1324 "%-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", 1325 ax2asc(buf, &nr->source_addr), 1326 devname, 1327 nr->my_index, 1328 nr->my_id, 1329 nr->your_index, 1330 nr->your_id, 1331 nr->state, 1332 nr->vs, 1333 nr->vr, 1334 nr->va, 1335 ax25_display_timer(&nr->t1timer) / HZ, 1336 nr->t1 / HZ, 1337 ax25_display_timer(&nr->t2timer) / HZ, 1338 nr->t2 / HZ, 1339 ax25_display_timer(&nr->t4timer) / HZ, 1340 nr->t4 / HZ, 1341 ax25_display_timer(&nr->idletimer) / (60 * HZ), 1342 nr->idle / (60 * HZ), 1343 nr->n2count, 1344 nr->n2, 1345 nr->window, 1346 sk_wmem_alloc_get(s), 1347 sk_rmem_alloc_get(s), 1348 s->sk_socket ? SOCK_INODE(s->sk_socket)->i_ino : 0L); 1349 1350 bh_unlock_sock(s); 1351 } 1352 return 0; 1353 } 1354 1355 static const struct seq_operations nr_info_seqops = { 1356 .start = nr_info_start, 1357 .next = nr_info_next, 1358 .stop = nr_info_stop, 1359 .show = nr_info_show, 1360 }; 1361 1362 static int nr_info_open(struct inode *inode, struct file *file) 1363 { 1364 return seq_open(file, &nr_info_seqops); 1365 } 1366 1367 static const struct file_operations nr_info_fops = { 1368 .owner = THIS_MODULE, 1369 .open = nr_info_open, 1370 .read = seq_read, 1371 .llseek = seq_lseek, 1372 .release = seq_release, 1373 }; 1374 #endif /* CONFIG_PROC_FS */ 1375 1376 static const struct net_proto_family nr_family_ops = { 1377 .family = PF_NETROM, 1378 .create = nr_create, 1379 .owner = THIS_MODULE, 1380 }; 1381 1382 static const struct proto_ops nr_proto_ops = { 1383 .family = PF_NETROM, 1384 .owner = THIS_MODULE, 1385 .release = nr_release, 1386 .bind = nr_bind, 1387 .connect = nr_connect, 1388 .socketpair = sock_no_socketpair, 1389 .accept = nr_accept, 1390 .getname = nr_getname, 1391 .poll = datagram_poll, 1392 .ioctl = nr_ioctl, 1393 .listen = nr_listen, 1394 .shutdown = sock_no_shutdown, 1395 .setsockopt = nr_setsockopt, 1396 .getsockopt = nr_getsockopt, 1397 .sendmsg = nr_sendmsg, 1398 .recvmsg = nr_recvmsg, 1399 .mmap = sock_no_mmap, 1400 .sendpage = sock_no_sendpage, 1401 }; 1402 1403 static struct notifier_block nr_dev_notifier = { 1404 .notifier_call = nr_device_event, 1405 }; 1406 1407 static struct net_device **dev_nr; 1408 1409 static struct ax25_protocol nr_pid = { 1410 .pid = AX25_P_NETROM, 1411 .func = nr_route_frame 1412 }; 1413 1414 static struct ax25_linkfail nr_linkfail_notifier = { 1415 .func = nr_link_failed, 1416 }; 1417 1418 static int __init nr_proto_init(void) 1419 { 1420 int i; 1421 int rc = proto_register(&nr_proto, 0); 1422 1423 if (rc != 0) 1424 goto out; 1425 1426 if (nr_ndevs > 0x7fffffff/sizeof(struct net_device *)) { 1427 printk(KERN_ERR "NET/ROM: nr_proto_init - nr_ndevs parameter to large\n"); 1428 return -1; 1429 } 1430 1431 dev_nr = kzalloc(nr_ndevs * sizeof(struct net_device *), GFP_KERNEL); 1432 if (dev_nr == NULL) { 1433 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device array\n"); 1434 return -1; 1435 } 1436 1437 for (i = 0; i < nr_ndevs; i++) { 1438 char name[IFNAMSIZ]; 1439 struct net_device *dev; 1440 1441 sprintf(name, "nr%d", i); 1442 dev = alloc_netdev(0, name, nr_setup); 1443 if (!dev) { 1444 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device structure\n"); 1445 goto fail; 1446 } 1447 1448 dev->base_addr = i; 1449 if (register_netdev(dev)) { 1450 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register network device\n"); 1451 free_netdev(dev); 1452 goto fail; 1453 } 1454 nr_set_lockdep_key(dev); 1455 dev_nr[i] = dev; 1456 } 1457 1458 if (sock_register(&nr_family_ops)) { 1459 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register socket family\n"); 1460 goto fail; 1461 } 1462 1463 register_netdevice_notifier(&nr_dev_notifier); 1464 1465 ax25_register_pid(&nr_pid); 1466 ax25_linkfail_register(&nr_linkfail_notifier); 1467 1468 #ifdef CONFIG_SYSCTL 1469 nr_register_sysctl(); 1470 #endif 1471 1472 nr_loopback_init(); 1473 1474 proc_net_fops_create(&init_net, "nr", S_IRUGO, &nr_info_fops); 1475 proc_net_fops_create(&init_net, "nr_neigh", S_IRUGO, &nr_neigh_fops); 1476 proc_net_fops_create(&init_net, "nr_nodes", S_IRUGO, &nr_nodes_fops); 1477 out: 1478 return rc; 1479 fail: 1480 while (--i >= 0) { 1481 unregister_netdev(dev_nr[i]); 1482 free_netdev(dev_nr[i]); 1483 } 1484 kfree(dev_nr); 1485 proto_unregister(&nr_proto); 1486 rc = -1; 1487 goto out; 1488 } 1489 1490 module_init(nr_proto_init); 1491 1492 module_param(nr_ndevs, int, 0); 1493 MODULE_PARM_DESC(nr_ndevs, "number of NET/ROM devices"); 1494 1495 MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>"); 1496 MODULE_DESCRIPTION("The amateur radio NET/ROM network and transport layer protocol"); 1497 MODULE_LICENSE("GPL"); 1498 MODULE_ALIAS_NETPROTO(PF_NETROM); 1499 1500 static void __exit nr_exit(void) 1501 { 1502 int i; 1503 1504 proc_net_remove(&init_net, "nr"); 1505 proc_net_remove(&init_net, "nr_neigh"); 1506 proc_net_remove(&init_net, "nr_nodes"); 1507 nr_loopback_clear(); 1508 1509 nr_rt_free(); 1510 1511 #ifdef CONFIG_SYSCTL 1512 nr_unregister_sysctl(); 1513 #endif 1514 1515 ax25_linkfail_release(&nr_linkfail_notifier); 1516 ax25_protocol_release(AX25_P_NETROM); 1517 1518 unregister_netdevice_notifier(&nr_dev_notifier); 1519 1520 sock_unregister(PF_NETROM); 1521 1522 for (i = 0; i < nr_ndevs; i++) { 1523 struct net_device *dev = dev_nr[i]; 1524 if (dev) { 1525 unregister_netdev(dev); 1526 free_netdev(dev); 1527 } 1528 } 1529 1530 kfree(dev_nr); 1531 proto_unregister(&nr_proto); 1532 } 1533 module_exit(nr_exit); 1534