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