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/slab.h> 19 #include <linux/kernel.h> 20 #include <linux/sched.h> 21 #include <linux/timer.h> 22 #include <linux/string.h> 23 #include <linux/sockios.h> 24 #include <linux/net.h> 25 #include <linux/stat.h> 26 #include <net/ax25.h> 27 #include <linux/inet.h> 28 #include <linux/netdevice.h> 29 #include <linux/if_arp.h> 30 #include <linux/skbuff.h> 31 #include <net/net_namespace.h> 32 #include <net/sock.h> 33 #include <asm/uaccess.h> 34 #include <asm/system.h> 35 #include <linux/fcntl.h> 36 #include <linux/termios.h> /* For TIOCINQ/OUTQ */ 37 #include <linux/mm.h> 38 #include <linux/interrupt.h> 39 #include <linux/notifier.h> 40 #include <net/netrom.h> 41 #include <linux/proc_fs.h> 42 #include <linux/seq_file.h> 43 #include <net/ip.h> 44 #include <net/tcp_states.h> 45 #include <net/arp.h> 46 #include <linux/init.h> 47 48 static int nr_ndevs = 4; 49 50 int sysctl_netrom_default_path_quality = NR_DEFAULT_QUAL; 51 int sysctl_netrom_obsolescence_count_initialiser = NR_DEFAULT_OBS; 52 int sysctl_netrom_network_ttl_initialiser = NR_DEFAULT_TTL; 53 int sysctl_netrom_transport_timeout = NR_DEFAULT_T1; 54 int sysctl_netrom_transport_maximum_tries = NR_DEFAULT_N2; 55 int sysctl_netrom_transport_acknowledge_delay = NR_DEFAULT_T2; 56 int sysctl_netrom_transport_busy_delay = NR_DEFAULT_T4; 57 int sysctl_netrom_transport_requested_window_size = NR_DEFAULT_WINDOW; 58 int sysctl_netrom_transport_no_activity_timeout = NR_DEFAULT_IDLE; 59 int sysctl_netrom_routing_control = NR_DEFAULT_ROUTING; 60 int sysctl_netrom_link_fails_count = NR_DEFAULT_FAILS; 61 int sysctl_netrom_reset_circuit = NR_DEFAULT_RESET; 62 63 static unsigned short circuit = 0x101; 64 65 static HLIST_HEAD(nr_list); 66 static DEFINE_SPINLOCK(nr_list_lock); 67 68 static const struct proto_ops nr_proto_ops; 69 70 /* 71 * NETROM network devices are virtual network devices encapsulating NETROM 72 * frames into AX.25 which will be sent through an AX.25 device, so form a 73 * special "super class" of normal net devices; split their locks off into a 74 * separate class since they always nest. 75 */ 76 static struct lock_class_key nr_netdev_xmit_lock_key; 77 static struct lock_class_key nr_netdev_addr_lock_key; 78 79 static void nr_set_lockdep_one(struct net_device *dev, 80 struct netdev_queue *txq, 81 void *_unused) 82 { 83 lockdep_set_class(&txq->_xmit_lock, &nr_netdev_xmit_lock_key); 84 } 85 86 static void nr_set_lockdep_key(struct net_device *dev) 87 { 88 lockdep_set_class(&dev->addr_list_lock, &nr_netdev_addr_lock_key); 89 netdev_for_each_tx_queue(dev, nr_set_lockdep_one, NULL); 90 } 91 92 /* 93 * Socket removal during an interrupt is now safe. 94 */ 95 static void nr_remove_socket(struct sock *sk) 96 { 97 spin_lock_bh(&nr_list_lock); 98 sk_del_node_init(sk); 99 spin_unlock_bh(&nr_list_lock); 100 } 101 102 /* 103 * Kill all bound sockets on a dropped device. 104 */ 105 static void nr_kill_by_device(struct net_device *dev) 106 { 107 struct sock *s; 108 struct hlist_node *node; 109 110 spin_lock_bh(&nr_list_lock); 111 sk_for_each(s, node, &nr_list) 112 if (nr_sk(s)->device == dev) 113 nr_disconnect(s, ENETUNREACH); 114 spin_unlock_bh(&nr_list_lock); 115 } 116 117 /* 118 * Handle device status changes. 119 */ 120 static int nr_device_event(struct notifier_block *this, unsigned long event, void *ptr) 121 { 122 struct net_device *dev = (struct net_device *)ptr; 123 124 if (!net_eq(dev_net(dev), &init_net)) 125 return NOTIFY_DONE; 126 127 if (event != NETDEV_DOWN) 128 return NOTIFY_DONE; 129 130 nr_kill_by_device(dev); 131 nr_rt_device_down(dev); 132 133 return NOTIFY_DONE; 134 } 135 136 /* 137 * Add a socket to the bound sockets list. 138 */ 139 static void nr_insert_socket(struct sock *sk) 140 { 141 spin_lock_bh(&nr_list_lock); 142 sk_add_node(sk, &nr_list); 143 spin_unlock_bh(&nr_list_lock); 144 } 145 146 /* 147 * Find a socket that wants to accept the Connect Request we just 148 * received. 149 */ 150 static struct sock *nr_find_listener(ax25_address *addr) 151 { 152 struct sock *s; 153 struct hlist_node *node; 154 155 spin_lock_bh(&nr_list_lock); 156 sk_for_each(s, node, &nr_list) 157 if (!ax25cmp(&nr_sk(s)->source_addr, addr) && 158 s->sk_state == TCP_LISTEN) { 159 bh_lock_sock(s); 160 goto found; 161 } 162 s = NULL; 163 found: 164 spin_unlock_bh(&nr_list_lock); 165 return s; 166 } 167 168 /* 169 * Find a connected NET/ROM socket given my circuit IDs. 170 */ 171 static struct sock *nr_find_socket(unsigned char index, unsigned char id) 172 { 173 struct sock *s; 174 struct hlist_node *node; 175 176 spin_lock_bh(&nr_list_lock); 177 sk_for_each(s, node, &nr_list) { 178 struct nr_sock *nr = nr_sk(s); 179 180 if (nr->my_index == index && nr->my_id == id) { 181 bh_lock_sock(s); 182 goto found; 183 } 184 } 185 s = NULL; 186 found: 187 spin_unlock_bh(&nr_list_lock); 188 return s; 189 } 190 191 /* 192 * Find a connected NET/ROM socket given their circuit IDs. 193 */ 194 static struct sock *nr_find_peer(unsigned char index, unsigned char id, 195 ax25_address *dest) 196 { 197 struct sock *s; 198 struct hlist_node *node; 199 200 spin_lock_bh(&nr_list_lock); 201 sk_for_each(s, node, &nr_list) { 202 struct nr_sock *nr = nr_sk(s); 203 204 if (nr->your_index == index && nr->your_id == id && 205 !ax25cmp(&nr->dest_addr, dest)) { 206 bh_lock_sock(s); 207 goto found; 208 } 209 } 210 s = NULL; 211 found: 212 spin_unlock_bh(&nr_list_lock); 213 return s; 214 } 215 216 /* 217 * Find next free circuit ID. 218 */ 219 static unsigned short nr_find_next_circuit(void) 220 { 221 unsigned short id = circuit; 222 unsigned char i, j; 223 struct sock *sk; 224 225 for (;;) { 226 i = id / 256; 227 j = id % 256; 228 229 if (i != 0 && j != 0) { 230 if ((sk=nr_find_socket(i, j)) == NULL) 231 break; 232 bh_unlock_sock(sk); 233 } 234 235 id++; 236 } 237 238 return id; 239 } 240 241 /* 242 * Deferred destroy. 243 */ 244 void nr_destroy_socket(struct sock *); 245 246 /* 247 * Handler for deferred kills. 248 */ 249 static void nr_destroy_timer(unsigned long data) 250 { 251 struct sock *sk=(struct sock *)data; 252 bh_lock_sock(sk); 253 sock_hold(sk); 254 nr_destroy_socket(sk); 255 bh_unlock_sock(sk); 256 sock_put(sk); 257 } 258 259 /* 260 * This is called from user mode and the timers. Thus it protects itself 261 * against interrupt users but doesn't worry about being called during 262 * work. Once it is removed from the queue no interrupt or bottom half 263 * will touch it and we are (fairly 8-) ) safe. 264 */ 265 void nr_destroy_socket(struct sock *sk) 266 { 267 struct sk_buff *skb; 268 269 nr_remove_socket(sk); 270 271 nr_stop_heartbeat(sk); 272 nr_stop_t1timer(sk); 273 nr_stop_t2timer(sk); 274 nr_stop_t4timer(sk); 275 nr_stop_idletimer(sk); 276 277 nr_clear_queues(sk); /* Flush the queues */ 278 279 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { 280 if (skb->sk != sk) { /* A pending connection */ 281 /* Queue the unaccepted socket for death */ 282 sock_set_flag(skb->sk, SOCK_DEAD); 283 nr_start_heartbeat(skb->sk); 284 nr_sk(skb->sk)->state = NR_STATE_0; 285 } 286 287 kfree_skb(skb); 288 } 289 290 if (sk_has_allocations(sk)) { 291 /* Defer: outstanding buffers */ 292 sk->sk_timer.function = nr_destroy_timer; 293 sk->sk_timer.expires = jiffies + 2 * HZ; 294 add_timer(&sk->sk_timer); 295 } else 296 sock_put(sk); 297 } 298 299 /* 300 * Handling for system calls applied via the various interfaces to a 301 * NET/ROM socket object. 302 */ 303 304 static int nr_setsockopt(struct socket *sock, int level, int optname, 305 char __user *optval, unsigned int optlen) 306 { 307 struct sock *sk = sock->sk; 308 struct nr_sock *nr = nr_sk(sk); 309 int opt; 310 311 if (level != SOL_NETROM) 312 return -ENOPROTOOPT; 313 314 if (optlen < sizeof(int)) 315 return -EINVAL; 316 317 if (get_user(opt, (int __user *)optval)) 318 return -EFAULT; 319 320 switch (optname) { 321 case NETROM_T1: 322 if (opt < 1) 323 return -EINVAL; 324 nr->t1 = opt * HZ; 325 return 0; 326 327 case NETROM_T2: 328 if (opt < 1) 329 return -EINVAL; 330 nr->t2 = opt * HZ; 331 return 0; 332 333 case NETROM_N2: 334 if (opt < 1 || opt > 31) 335 return -EINVAL; 336 nr->n2 = opt; 337 return 0; 338 339 case NETROM_T4: 340 if (opt < 1) 341 return -EINVAL; 342 nr->t4 = opt * HZ; 343 return 0; 344 345 case NETROM_IDLE: 346 if (opt < 0) 347 return -EINVAL; 348 nr->idle = opt * 60 * HZ; 349 return 0; 350 351 default: 352 return -ENOPROTOOPT; 353 } 354 } 355 356 static int nr_getsockopt(struct socket *sock, int level, int optname, 357 char __user *optval, int __user *optlen) 358 { 359 struct sock *sk = sock->sk; 360 struct nr_sock *nr = nr_sk(sk); 361 int val = 0; 362 int len; 363 364 if (level != SOL_NETROM) 365 return -ENOPROTOOPT; 366 367 if (get_user(len, optlen)) 368 return -EFAULT; 369 370 if (len < 0) 371 return -EINVAL; 372 373 switch (optname) { 374 case NETROM_T1: 375 val = nr->t1 / HZ; 376 break; 377 378 case NETROM_T2: 379 val = nr->t2 / HZ; 380 break; 381 382 case NETROM_N2: 383 val = nr->n2; 384 break; 385 386 case NETROM_T4: 387 val = nr->t4 / HZ; 388 break; 389 390 case NETROM_IDLE: 391 val = nr->idle / (60 * HZ); 392 break; 393 394 default: 395 return -ENOPROTOOPT; 396 } 397 398 len = min_t(unsigned int, len, sizeof(int)); 399 400 if (put_user(len, optlen)) 401 return -EFAULT; 402 403 return copy_to_user(optval, &val, len) ? -EFAULT : 0; 404 } 405 406 static int nr_listen(struct socket *sock, int backlog) 407 { 408 struct sock *sk = sock->sk; 409 410 lock_sock(sk); 411 if (sk->sk_state != TCP_LISTEN) { 412 memset(&nr_sk(sk)->user_addr, 0, AX25_ADDR_LEN); 413 sk->sk_max_ack_backlog = backlog; 414 sk->sk_state = TCP_LISTEN; 415 release_sock(sk); 416 return 0; 417 } 418 release_sock(sk); 419 420 return -EOPNOTSUPP; 421 } 422 423 static struct proto nr_proto = { 424 .name = "NETROM", 425 .owner = THIS_MODULE, 426 .obj_size = sizeof(struct nr_sock), 427 }; 428 429 static int nr_create(struct net *net, struct socket *sock, int protocol, 430 int kern) 431 { 432 struct sock *sk; 433 struct nr_sock *nr; 434 435 if (!net_eq(net, &init_net)) 436 return -EAFNOSUPPORT; 437 438 if (sock->type != SOCK_SEQPACKET || protocol != 0) 439 return -ESOCKTNOSUPPORT; 440 441 sk = sk_alloc(net, PF_NETROM, GFP_ATOMIC, &nr_proto); 442 if (sk == NULL) 443 return -ENOMEM; 444 445 nr = nr_sk(sk); 446 447 sock_init_data(sock, sk); 448 449 sock->ops = &nr_proto_ops; 450 sk->sk_protocol = protocol; 451 452 skb_queue_head_init(&nr->ack_queue); 453 skb_queue_head_init(&nr->reseq_queue); 454 skb_queue_head_init(&nr->frag_queue); 455 456 nr_init_timers(sk); 457 458 nr->t1 = 459 msecs_to_jiffies(sysctl_netrom_transport_timeout); 460 nr->t2 = 461 msecs_to_jiffies(sysctl_netrom_transport_acknowledge_delay); 462 nr->n2 = 463 msecs_to_jiffies(sysctl_netrom_transport_maximum_tries); 464 nr->t4 = 465 msecs_to_jiffies(sysctl_netrom_transport_busy_delay); 466 nr->idle = 467 msecs_to_jiffies(sysctl_netrom_transport_no_activity_timeout); 468 nr->window = sysctl_netrom_transport_requested_window_size; 469 470 nr->bpqext = 1; 471 nr->state = NR_STATE_0; 472 473 return 0; 474 } 475 476 static struct sock *nr_make_new(struct sock *osk) 477 { 478 struct sock *sk; 479 struct nr_sock *nr, *onr; 480 481 if (osk->sk_type != SOCK_SEQPACKET) 482 return NULL; 483 484 sk = sk_alloc(sock_net(osk), PF_NETROM, GFP_ATOMIC, osk->sk_prot); 485 if (sk == NULL) 486 return NULL; 487 488 nr = nr_sk(sk); 489 490 sock_init_data(NULL, sk); 491 492 sk->sk_type = osk->sk_type; 493 sk->sk_priority = osk->sk_priority; 494 sk->sk_protocol = osk->sk_protocol; 495 sk->sk_rcvbuf = osk->sk_rcvbuf; 496 sk->sk_sndbuf = osk->sk_sndbuf; 497 sk->sk_state = TCP_ESTABLISHED; 498 sock_copy_flags(sk, osk); 499 500 skb_queue_head_init(&nr->ack_queue); 501 skb_queue_head_init(&nr->reseq_queue); 502 skb_queue_head_init(&nr->frag_queue); 503 504 nr_init_timers(sk); 505 506 onr = nr_sk(osk); 507 508 nr->t1 = onr->t1; 509 nr->t2 = onr->t2; 510 nr->n2 = onr->n2; 511 nr->t4 = onr->t4; 512 nr->idle = onr->idle; 513 nr->window = onr->window; 514 515 nr->device = onr->device; 516 nr->bpqext = onr->bpqext; 517 518 return sk; 519 } 520 521 static int nr_release(struct socket *sock) 522 { 523 struct sock *sk = sock->sk; 524 struct nr_sock *nr; 525 526 if (sk == NULL) return 0; 527 528 sock_hold(sk); 529 sock_orphan(sk); 530 lock_sock(sk); 531 nr = nr_sk(sk); 532 533 switch (nr->state) { 534 case NR_STATE_0: 535 case NR_STATE_1: 536 case NR_STATE_2: 537 nr_disconnect(sk, 0); 538 nr_destroy_socket(sk); 539 break; 540 541 case NR_STATE_3: 542 nr_clear_queues(sk); 543 nr->n2count = 0; 544 nr_write_internal(sk, NR_DISCREQ); 545 nr_start_t1timer(sk); 546 nr_stop_t2timer(sk); 547 nr_stop_t4timer(sk); 548 nr_stop_idletimer(sk); 549 nr->state = NR_STATE_2; 550 sk->sk_state = TCP_CLOSE; 551 sk->sk_shutdown |= SEND_SHUTDOWN; 552 sk->sk_state_change(sk); 553 sock_set_flag(sk, SOCK_DESTROY); 554 break; 555 556 default: 557 break; 558 } 559 560 sock->sk = NULL; 561 release_sock(sk); 562 sock_put(sk); 563 564 return 0; 565 } 566 567 static int nr_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 568 { 569 struct sock *sk = sock->sk; 570 struct nr_sock *nr = nr_sk(sk); 571 struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr; 572 struct net_device *dev; 573 ax25_uid_assoc *user; 574 ax25_address *source; 575 576 lock_sock(sk); 577 if (!sock_flag(sk, SOCK_ZAPPED)) { 578 release_sock(sk); 579 return -EINVAL; 580 } 581 if (addr_len < sizeof(struct sockaddr_ax25) || addr_len > sizeof(struct full_sockaddr_ax25)) { 582 release_sock(sk); 583 return -EINVAL; 584 } 585 if (addr_len < (addr->fsa_ax25.sax25_ndigis * sizeof(ax25_address) + sizeof(struct sockaddr_ax25))) { 586 release_sock(sk); 587 return -EINVAL; 588 } 589 if (addr->fsa_ax25.sax25_family != AF_NETROM) { 590 release_sock(sk); 591 return -EINVAL; 592 } 593 if ((dev = nr_dev_get(&addr->fsa_ax25.sax25_call)) == NULL) { 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); 634 635 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_sleep(sk), &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_sleep(sk), &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_sleep(sk), &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_sleep(sk), &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 /* 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_fromiovec(skb_transport_header(skb), msg->msg_iov, 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 kiocb *iocb, struct socket *sock, 1140 struct msghdr *msg, size_t size, int flags) 1141 { 1142 struct sock *sk = sock->sk; 1143 struct sockaddr_ax25 *sax = (struct sockaddr_ax25 *)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 skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 1174 1175 if (sax != NULL) { 1176 sax->sax25_family = AF_NETROM; 1177 skb_copy_from_linear_data_offset(skb, 7, sax->sax25_call.ax25_call, 1178 AX25_ADDR_LEN); 1179 } 1180 1181 msg->msg_namelen = sizeof(*sax); 1182 1183 skb_free_datagram(sk, skb); 1184 1185 release_sock(sk); 1186 return copied; 1187 } 1188 1189 1190 static int nr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1191 { 1192 struct sock *sk = sock->sk; 1193 void __user *argp = (void __user *)arg; 1194 int ret; 1195 1196 switch (cmd) { 1197 case TIOCOUTQ: { 1198 long amount; 1199 1200 lock_sock(sk); 1201 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk); 1202 if (amount < 0) 1203 amount = 0; 1204 release_sock(sk); 1205 return put_user(amount, (int __user *)argp); 1206 } 1207 1208 case TIOCINQ: { 1209 struct sk_buff *skb; 1210 long amount = 0L; 1211 1212 lock_sock(sk); 1213 /* These two are safe on a single CPU system as only user tasks fiddle here */ 1214 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) 1215 amount = skb->len; 1216 release_sock(sk); 1217 return put_user(amount, (int __user *)argp); 1218 } 1219 1220 case SIOCGSTAMP: 1221 lock_sock(sk); 1222 ret = sock_get_timestamp(sk, argp); 1223 release_sock(sk); 1224 return ret; 1225 1226 case SIOCGSTAMPNS: 1227 lock_sock(sk); 1228 ret = sock_get_timestampns(sk, argp); 1229 release_sock(sk); 1230 return ret; 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)) return -EPERM; 1248 return nr_rt_ioctl(cmd, argp); 1249 1250 default: 1251 return -ENOIOCTLCMD; 1252 } 1253 1254 return 0; 1255 } 1256 1257 #ifdef CONFIG_PROC_FS 1258 1259 static void *nr_info_start(struct seq_file *seq, loff_t *pos) 1260 { 1261 spin_lock_bh(&nr_list_lock); 1262 return seq_hlist_start_head(&nr_list, *pos); 1263 } 1264 1265 static void *nr_info_next(struct seq_file *seq, void *v, loff_t *pos) 1266 { 1267 return seq_hlist_next(v, &nr_list, pos); 1268 } 1269 1270 static void nr_info_stop(struct seq_file *seq, void *v) 1271 { 1272 spin_unlock_bh(&nr_list_lock); 1273 } 1274 1275 static int nr_info_show(struct seq_file *seq, void *v) 1276 { 1277 struct sock *s = sk_entry(v); 1278 struct net_device *dev; 1279 struct nr_sock *nr; 1280 const char *devname; 1281 char buf[11]; 1282 1283 if (v == SEQ_START_TOKEN) 1284 seq_puts(seq, 1285 "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"); 1286 1287 else { 1288 1289 bh_lock_sock(s); 1290 nr = nr_sk(s); 1291 1292 if ((dev = nr->device) == NULL) 1293 devname = "???"; 1294 else 1295 devname = dev->name; 1296 1297 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->user_addr)); 1298 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->dest_addr)); 1299 seq_printf(seq, 1300 "%-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", 1301 ax2asc(buf, &nr->source_addr), 1302 devname, 1303 nr->my_index, 1304 nr->my_id, 1305 nr->your_index, 1306 nr->your_id, 1307 nr->state, 1308 nr->vs, 1309 nr->vr, 1310 nr->va, 1311 ax25_display_timer(&nr->t1timer) / HZ, 1312 nr->t1 / HZ, 1313 ax25_display_timer(&nr->t2timer) / HZ, 1314 nr->t2 / HZ, 1315 ax25_display_timer(&nr->t4timer) / HZ, 1316 nr->t4 / HZ, 1317 ax25_display_timer(&nr->idletimer) / (60 * HZ), 1318 nr->idle / (60 * HZ), 1319 nr->n2count, 1320 nr->n2, 1321 nr->window, 1322 sk_wmem_alloc_get(s), 1323 sk_rmem_alloc_get(s), 1324 s->sk_socket ? SOCK_INODE(s->sk_socket)->i_ino : 0L); 1325 1326 bh_unlock_sock(s); 1327 } 1328 return 0; 1329 } 1330 1331 static const struct seq_operations nr_info_seqops = { 1332 .start = nr_info_start, 1333 .next = nr_info_next, 1334 .stop = nr_info_stop, 1335 .show = nr_info_show, 1336 }; 1337 1338 static int nr_info_open(struct inode *inode, struct file *file) 1339 { 1340 return seq_open(file, &nr_info_seqops); 1341 } 1342 1343 static const struct file_operations nr_info_fops = { 1344 .owner = THIS_MODULE, 1345 .open = nr_info_open, 1346 .read = seq_read, 1347 .llseek = seq_lseek, 1348 .release = seq_release, 1349 }; 1350 #endif /* CONFIG_PROC_FS */ 1351 1352 static const struct net_proto_family nr_family_ops = { 1353 .family = PF_NETROM, 1354 .create = nr_create, 1355 .owner = THIS_MODULE, 1356 }; 1357 1358 static const struct proto_ops nr_proto_ops = { 1359 .family = PF_NETROM, 1360 .owner = THIS_MODULE, 1361 .release = nr_release, 1362 .bind = nr_bind, 1363 .connect = nr_connect, 1364 .socketpair = sock_no_socketpair, 1365 .accept = nr_accept, 1366 .getname = nr_getname, 1367 .poll = datagram_poll, 1368 .ioctl = nr_ioctl, 1369 .listen = nr_listen, 1370 .shutdown = sock_no_shutdown, 1371 .setsockopt = nr_setsockopt, 1372 .getsockopt = nr_getsockopt, 1373 .sendmsg = nr_sendmsg, 1374 .recvmsg = nr_recvmsg, 1375 .mmap = sock_no_mmap, 1376 .sendpage = sock_no_sendpage, 1377 }; 1378 1379 static struct notifier_block nr_dev_notifier = { 1380 .notifier_call = nr_device_event, 1381 }; 1382 1383 static struct net_device **dev_nr; 1384 1385 static struct ax25_protocol nr_pid = { 1386 .pid = AX25_P_NETROM, 1387 .func = nr_route_frame 1388 }; 1389 1390 static struct ax25_linkfail nr_linkfail_notifier = { 1391 .func = nr_link_failed, 1392 }; 1393 1394 static int __init nr_proto_init(void) 1395 { 1396 int i; 1397 int rc = proto_register(&nr_proto, 0); 1398 1399 if (rc != 0) 1400 goto out; 1401 1402 if (nr_ndevs > 0x7fffffff/sizeof(struct net_device *)) { 1403 printk(KERN_ERR "NET/ROM: nr_proto_init - nr_ndevs parameter to large\n"); 1404 return -1; 1405 } 1406 1407 dev_nr = kzalloc(nr_ndevs * sizeof(struct net_device *), GFP_KERNEL); 1408 if (dev_nr == NULL) { 1409 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device array\n"); 1410 return -1; 1411 } 1412 1413 for (i = 0; i < nr_ndevs; i++) { 1414 char name[IFNAMSIZ]; 1415 struct net_device *dev; 1416 1417 sprintf(name, "nr%d", i); 1418 dev = alloc_netdev(0, name, nr_setup); 1419 if (!dev) { 1420 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device structure\n"); 1421 goto fail; 1422 } 1423 1424 dev->base_addr = i; 1425 if (register_netdev(dev)) { 1426 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register network device\n"); 1427 free_netdev(dev); 1428 goto fail; 1429 } 1430 nr_set_lockdep_key(dev); 1431 dev_nr[i] = dev; 1432 } 1433 1434 if (sock_register(&nr_family_ops)) { 1435 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register socket family\n"); 1436 goto fail; 1437 } 1438 1439 register_netdevice_notifier(&nr_dev_notifier); 1440 1441 ax25_register_pid(&nr_pid); 1442 ax25_linkfail_register(&nr_linkfail_notifier); 1443 1444 #ifdef CONFIG_SYSCTL 1445 nr_register_sysctl(); 1446 #endif 1447 1448 nr_loopback_init(); 1449 1450 proc_net_fops_create(&init_net, "nr", S_IRUGO, &nr_info_fops); 1451 proc_net_fops_create(&init_net, "nr_neigh", S_IRUGO, &nr_neigh_fops); 1452 proc_net_fops_create(&init_net, "nr_nodes", S_IRUGO, &nr_nodes_fops); 1453 out: 1454 return rc; 1455 fail: 1456 while (--i >= 0) { 1457 unregister_netdev(dev_nr[i]); 1458 free_netdev(dev_nr[i]); 1459 } 1460 kfree(dev_nr); 1461 proto_unregister(&nr_proto); 1462 rc = -1; 1463 goto out; 1464 } 1465 1466 module_init(nr_proto_init); 1467 1468 module_param(nr_ndevs, int, 0); 1469 MODULE_PARM_DESC(nr_ndevs, "number of NET/ROM devices"); 1470 1471 MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>"); 1472 MODULE_DESCRIPTION("The amateur radio NET/ROM network and transport layer protocol"); 1473 MODULE_LICENSE("GPL"); 1474 MODULE_ALIAS_NETPROTO(PF_NETROM); 1475 1476 static void __exit nr_exit(void) 1477 { 1478 int i; 1479 1480 proc_net_remove(&init_net, "nr"); 1481 proc_net_remove(&init_net, "nr_neigh"); 1482 proc_net_remove(&init_net, "nr_nodes"); 1483 nr_loopback_clear(); 1484 1485 nr_rt_free(); 1486 1487 #ifdef CONFIG_SYSCTL 1488 nr_unregister_sysctl(); 1489 #endif 1490 1491 ax25_linkfail_release(&nr_linkfail_notifier); 1492 ax25_protocol_release(AX25_P_NETROM); 1493 1494 unregister_netdevice_notifier(&nr_dev_notifier); 1495 1496 sock_unregister(PF_NETROM); 1497 1498 for (i = 0; i < nr_ndevs; i++) { 1499 struct net_device *dev = dev_nr[i]; 1500 if (dev) { 1501 unregister_netdev(dev); 1502 free_netdev(dev); 1503 } 1504 } 1505 1506 kfree(dev_nr); 1507 proto_unregister(&nr_proto); 1508 } 1509 module_exit(nr_exit); 1510