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radix-tree: fix small lockless radix-tree bug
[linux-2.6/pdupreez.git] / net / netrom / af_netrom.c
blob4bae8b998cab8fa27325021ca1c4fc7e7ff3b40e
1 /*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
6 *
7 * Copyright Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
8 * Copyright Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk)
9 * Copyright Darryl Miles G7LED (dlm@g7led.demon.co.uk)
10 */
11 #include <linux/module.h>
12 #include <linux/moduleparam.h>
13 #include <linux/capability.h>
14 #include <linux/errno.h>
15 #include <linux/types.h>
16 #include <linux/socket.h>
17 #include <linux/in.h>
18 #include <linux/kernel.h>
19 #include <linux/sched.h>
20 #include <linux/timer.h>
21 #include <linux/string.h>
22 #include <linux/sockios.h>
23 #include <linux/net.h>
24 #include <linux/stat.h>
25 #include <net/ax25.h>
26 #include <linux/inet.h>
27 #include <linux/netdevice.h>
28 #include <linux/if_arp.h>
29 #include <linux/skbuff.h>
30 #include <net/net_namespace.h>
31 #include <net/sock.h>
32 #include <asm/uaccess.h>
33 #include <asm/system.h>
34 #include <linux/fcntl.h>
35 #include <linux/termios.h> /* For TIOCINQ/OUTQ */
36 #include <linux/mm.h>
37 #include <linux/interrupt.h>
38 #include <linux/notifier.h>
39 #include <net/netrom.h>
40 #include <linux/proc_fs.h>
41 #include <linux/seq_file.h>
42 #include <net/ip.h>
43 #include <net/tcp_states.h>
44 #include <net/arp.h>
45 #include <linux/init.h>
46
47 static int nr_ndevs = 4;
48
49 int sysctl_netrom_default_path_quality = NR_DEFAULT_QUAL;
50 int sysctl_netrom_obsolescence_count_initialiser = NR_DEFAULT_OBS;
51 int sysctl_netrom_network_ttl_initialiser = NR_DEFAULT_TTL;
52 int sysctl_netrom_transport_timeout = NR_DEFAULT_T1;
53 int sysctl_netrom_transport_maximum_tries = NR_DEFAULT_N2;
54 int sysctl_netrom_transport_acknowledge_delay = NR_DEFAULT_T2;
55 int sysctl_netrom_transport_busy_delay = NR_DEFAULT_T4;
56 int sysctl_netrom_transport_requested_window_size = NR_DEFAULT_WINDOW;
57 int sysctl_netrom_transport_no_activity_timeout = NR_DEFAULT_IDLE;
58 int sysctl_netrom_routing_control = NR_DEFAULT_ROUTING;
59 int sysctl_netrom_link_fails_count = NR_DEFAULT_FAILS;
60 int sysctl_netrom_reset_circuit = NR_DEFAULT_RESET;
61
62 static unsigned short circuit = 0x101;
63
64 static HLIST_HEAD(nr_list);
65 static DEFINE_SPINLOCK(nr_list_lock);
66
67 static const struct proto_ops nr_proto_ops;
68
69 /*
70 * NETROM network devices are virtual network devices encapsulating NETROM
71 * frames into AX.25 which will be sent through an AX.25 device, so form a
72 * special "super class" of normal net devices; split their locks off into a
73 * separate class since they always nest.
74 */
75 static struct lock_class_key nr_netdev_xmit_lock_key;
76
77 /*
78 * Socket removal during an interrupt is now safe.
79 */
80 static void nr_remove_socket(struct sock *sk)
81 {
82 spin_lock_bh(&nr_list_lock);
83 sk_del_node_init(sk);
84 spin_unlock_bh(&nr_list_lock);
85 }
86
87 /*
88 * Kill all bound sockets on a dropped device.
89 */
90 static void nr_kill_by_device(struct net_device *dev)
91 {
92 struct sock *s;
93 struct hlist_node *node;
94
95 spin_lock_bh(&nr_list_lock);
96 sk_for_each(s, node, &nr_list)
97 if (nr_sk(s)->device == dev)
98 nr_disconnect(s, ENETUNREACH);
99 spin_unlock_bh(&nr_list_lock);
100 }
101
102 /*
103 * Handle device status changes.
104 */
105 static int nr_device_event(struct notifier_block *this, unsigned long event, void *ptr)
106 {
107 struct net_device *dev = (struct net_device *)ptr;
108
109 if (dev_net(dev) != &init_net)
110 return NOTIFY_DONE;
111
112 if (event != NETDEV_DOWN)
113 return NOTIFY_DONE;
114
115 nr_kill_by_device(dev);
116 nr_rt_device_down(dev);
117
118 return NOTIFY_DONE;
119 }
120
121 /*
122 * Add a socket to the bound sockets list.
123 */
124 static void nr_insert_socket(struct sock *sk)
125 {
126 spin_lock_bh(&nr_list_lock);
127 sk_add_node(sk, &nr_list);
128 spin_unlock_bh(&nr_list_lock);
129 }
130
131 /*
132 * Find a socket that wants to accept the Connect Request we just
133 * received.
134 */
135 static struct sock *nr_find_listener(ax25_address *addr)
136 {
137 struct sock *s;
138 struct hlist_node *node;
139
140 spin_lock_bh(&nr_list_lock);
141 sk_for_each(s, node, &nr_list)
142 if (!ax25cmp(&nr_sk(s)->source_addr, addr) &&
143 s->sk_state == TCP_LISTEN) {
144 bh_lock_sock(s);
145 goto found;
146 }
147 s = NULL;
148 found:
149 spin_unlock_bh(&nr_list_lock);
150 return s;
151 }
152
153 /*
154 * Find a connected NET/ROM socket given my circuit IDs.
155 */
156 static struct sock *nr_find_socket(unsigned char index, unsigned char id)
157 {
158 struct sock *s;
159 struct hlist_node *node;
160
161 spin_lock_bh(&nr_list_lock);
162 sk_for_each(s, node, &nr_list) {
163 struct nr_sock *nr = nr_sk(s);
164
165 if (nr->my_index == index && nr->my_id == id) {
166 bh_lock_sock(s);
167 goto found;
168 }
169 }
170 s = NULL;
171 found:
172 spin_unlock_bh(&nr_list_lock);
173 return s;
174 }
175
176 /*
177 * Find a connected NET/ROM socket given their circuit IDs.
178 */
179 static struct sock *nr_find_peer(unsigned char index, unsigned char id,
180 ax25_address *dest)
181 {
182 struct sock *s;
183 struct hlist_node *node;
184
185 spin_lock_bh(&nr_list_lock);
186 sk_for_each(s, node, &nr_list) {
187 struct nr_sock *nr = nr_sk(s);
188
189 if (nr->your_index == index && nr->your_id == id &&
190 !ax25cmp(&nr->dest_addr, dest)) {
191 bh_lock_sock(s);
192 goto found;
193 }
194 }
195 s = NULL;
196 found:
197 spin_unlock_bh(&nr_list_lock);
198 return s;
199 }
200
201 /*
202 * Find next free circuit ID.
203 */
204 static unsigned short nr_find_next_circuit(void)
205 {
206 unsigned short id = circuit;
207 unsigned char i, j;
208 struct sock *sk;
209
210 for (;;) {
211 i = id / 256;
212 j = id % 256;
213
214 if (i != 0 && j != 0) {
215 if ((sk=nr_find_socket(i, j)) == NULL)
216 break;
217 bh_unlock_sock(sk);
218 }
219
220 id++;
221 }
222
223 return id;
224 }
225
226 /*
227 * Deferred destroy.
228 */
229 void nr_destroy_socket(struct sock *);
230
231 /*
232 * Handler for deferred kills.
233 */
234 static void nr_destroy_timer(unsigned long data)
235 {
236 struct sock *sk=(struct sock *)data;
237 bh_lock_sock(sk);
238 sock_hold(sk);
239 nr_destroy_socket(sk);
240 bh_unlock_sock(sk);
241 sock_put(sk);
242 }
243
244 /*
245 * This is called from user mode and the timers. Thus it protects itself
246 * against interrupt users but doesn't worry about being called during
247 * work. Once it is removed from the queue no interrupt or bottom half
248 * will touch it and we are (fairly 8-) ) safe.
249 */
250 void nr_destroy_socket(struct sock *sk)
251 {
252 struct sk_buff *skb;
253
254 nr_remove_socket(sk);
255
256 nr_stop_heartbeat(sk);
257 nr_stop_t1timer(sk);
258 nr_stop_t2timer(sk);
259 nr_stop_t4timer(sk);
260 nr_stop_idletimer(sk);
261
262 nr_clear_queues(sk); /* Flush the queues */
263
264 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
265 if (skb->sk != sk) { /* A pending connection */
266 /* Queue the unaccepted socket for death */
267 sock_set_flag(skb->sk, SOCK_DEAD);
268 nr_start_heartbeat(skb->sk);
269 nr_sk(skb->sk)->state = NR_STATE_0;
270 }
271
272 kfree_skb(skb);
273 }
274
275 if (atomic_read(&sk->sk_wmem_alloc) ||
276 atomic_read(&sk->sk_rmem_alloc)) {
277 /* Defer: outstanding buffers */
278 sk->sk_timer.function = nr_destroy_timer;
279 sk->sk_timer.expires = jiffies + 2 * HZ;
280 add_timer(&sk->sk_timer);
281 } else
282 sock_put(sk);
283 }
284
285 /*
286 * Handling for system calls applied via the various interfaces to a
287 * NET/ROM socket object.
288 */
289
290 static int nr_setsockopt(struct socket *sock, int level, int optname,
291 char __user *optval, int optlen)
292 {
293 struct sock *sk = sock->sk;
294 struct nr_sock *nr = nr_sk(sk);
295 int opt;
296
297 if (level != SOL_NETROM)
298 return -ENOPROTOOPT;
299
300 if (optlen < sizeof(int))
301 return -EINVAL;
302
303 if (get_user(opt, (int __user *)optval))
304 return -EFAULT;
305
306 switch (optname) {
307 case NETROM_T1:
308 if (opt < 1)
309 return -EINVAL;
310 nr->t1 = opt * HZ;
311 return 0;
312
313 case NETROM_T2:
314 if (opt < 1)
315 return -EINVAL;
316 nr->t2 = opt * HZ;
317 return 0;
318
319 case NETROM_N2:
320 if (opt < 1 || opt > 31)
321 return -EINVAL;
322 nr->n2 = opt;
323 return 0;
324
325 case NETROM_T4:
326 if (opt < 1)
327 return -EINVAL;
328 nr->t4 = opt * HZ;
329 return 0;
330
331 case NETROM_IDLE:
332 if (opt < 0)
333 return -EINVAL;
334 nr->idle = opt * 60 * HZ;
335 return 0;
336
337 default:
338 return -ENOPROTOOPT;
339 }
340 }
341
342 static int nr_getsockopt(struct socket *sock, int level, int optname,
343 char __user *optval, int __user *optlen)
344 {
345 struct sock *sk = sock->sk;
346 struct nr_sock *nr = nr_sk(sk);
347 int val = 0;
348 int len;
349
350 if (level != SOL_NETROM)
351 return -ENOPROTOOPT;
352
353 if (get_user(len, optlen))
354 return -EFAULT;
355
356 if (len < 0)
357 return -EINVAL;
358
359 switch (optname) {
360 case NETROM_T1:
361 val = nr->t1 / HZ;
362 break;
363
364 case NETROM_T2:
365 val = nr->t2 / HZ;
366 break;
367
368 case NETROM_N2:
369 val = nr->n2;
370 break;
371
372 case NETROM_T4:
373 val = nr->t4 / HZ;
374 break;
375
376 case NETROM_IDLE:
377 val = nr->idle / (60 * HZ);
378 break;
379
380 default:
381 return -ENOPROTOOPT;
382 }
383
384 len = min_t(unsigned int, len, sizeof(int));
385
386 if (put_user(len, optlen))
387 return -EFAULT;
388
389 return copy_to_user(optval, &val, len) ? -EFAULT : 0;
390 }
391
392 static int nr_listen(struct socket *sock, int backlog)
393 {
394 struct sock *sk = sock->sk;
395
396 lock_sock(sk);
397 if (sk->sk_state != TCP_LISTEN) {
398 memset(&nr_sk(sk)->user_addr, 0, AX25_ADDR_LEN);
399 sk->sk_max_ack_backlog = backlog;
400 sk->sk_state = TCP_LISTEN;
401 release_sock(sk);
402 return 0;
403 }
404 release_sock(sk);
405
406 return -EOPNOTSUPP;
407 }
408
409 static struct proto nr_proto = {
410 .name = "NETROM",
411 .owner = THIS_MODULE,
412 .obj_size = sizeof(struct nr_sock),
413 };
414
415 static int nr_create(struct net *net, struct socket *sock, int protocol)
416 {
417 struct sock *sk;
418 struct nr_sock *nr;
419
420 if (net != &init_net)
421 return -EAFNOSUPPORT;
422
423 if (sock->type != SOCK_SEQPACKET || protocol != 0)
424 return -ESOCKTNOSUPPORT;
425
426 sk = sk_alloc(net, PF_NETROM, GFP_ATOMIC, &nr_proto);
427 if (sk == NULL)
428 return -ENOMEM;
429
430 nr = nr_sk(sk);
431
432 sock_init_data(sock, sk);
433
434 sock->ops = &nr_proto_ops;
435 sk->sk_protocol = protocol;
436
437 skb_queue_head_init(&nr->ack_queue);
438 skb_queue_head_init(&nr->reseq_queue);
439 skb_queue_head_init(&nr->frag_queue);
440
441 nr_init_timers(sk);
442
443 nr->t1 =
444 msecs_to_jiffies(sysctl_netrom_transport_timeout);
445 nr->t2 =
446 msecs_to_jiffies(sysctl_netrom_transport_acknowledge_delay);
447 nr->n2 =
448 msecs_to_jiffies(sysctl_netrom_transport_maximum_tries);
449 nr->t4 =
450 msecs_to_jiffies(sysctl_netrom_transport_busy_delay);
451 nr->idle =
452 msecs_to_jiffies(sysctl_netrom_transport_no_activity_timeout);
453 nr->window = sysctl_netrom_transport_requested_window_size;
454
455 nr->bpqext = 1;
456 nr->state = NR_STATE_0;
457
458 return 0;
459 }
460
461 static struct sock *nr_make_new(struct sock *osk)
462 {
463 struct sock *sk;
464 struct nr_sock *nr, *onr;
465
466 if (osk->sk_type != SOCK_SEQPACKET)
467 return NULL;
468
469 sk = sk_alloc(sock_net(osk), PF_NETROM, GFP_ATOMIC, osk->sk_prot);
470 if (sk == NULL)
471 return NULL;
472
473 nr = nr_sk(sk);
474
475 sock_init_data(NULL, sk);
476
477 sk->sk_type = osk->sk_type;
478 sk->sk_socket = osk->sk_socket;
479 sk->sk_priority = osk->sk_priority;
480 sk->sk_protocol = osk->sk_protocol;
481 sk->sk_rcvbuf = osk->sk_rcvbuf;
482 sk->sk_sndbuf = osk->sk_sndbuf;
483 sk->sk_state = TCP_ESTABLISHED;
484 sk->sk_sleep = osk->sk_sleep;
485 sock_copy_flags(sk, osk);
486
487 skb_queue_head_init(&nr->ack_queue);
488 skb_queue_head_init(&nr->reseq_queue);
489 skb_queue_head_init(&nr->frag_queue);
490
491 nr_init_timers(sk);
492
493 onr = nr_sk(osk);
494
495 nr->t1 = onr->t1;
496 nr->t2 = onr->t2;
497 nr->n2 = onr->n2;
498 nr->t4 = onr->t4;
499 nr->idle = onr->idle;
500 nr->window = onr->window;
501
502 nr->device = onr->device;
503 nr->bpqext = onr->bpqext;
504
505 return sk;
506 }
507
508 static int nr_release(struct socket *sock)
509 {
510 struct sock *sk = sock->sk;
511 struct nr_sock *nr;
512
513 if (sk == NULL) return 0;
514
515 sock_hold(sk);
516 lock_sock(sk);
517 nr = nr_sk(sk);
518
519 switch (nr->state) {
520 case NR_STATE_0:
521 case NR_STATE_1:
522 case NR_STATE_2:
523 nr_disconnect(sk, 0);
524 nr_destroy_socket(sk);
525 break;
526
527 case NR_STATE_3:
528 nr_clear_queues(sk);
529 nr->n2count = 0;
530 nr_write_internal(sk, NR_DISCREQ);
531 nr_start_t1timer(sk);
532 nr_stop_t2timer(sk);
533 nr_stop_t4timer(sk);
534 nr_stop_idletimer(sk);
535 nr->state = NR_STATE_2;
536 sk->sk_state = TCP_CLOSE;
537 sk->sk_shutdown |= SEND_SHUTDOWN;
538 sk->sk_state_change(sk);
539 sock_orphan(sk);
540 sock_set_flag(sk, SOCK_DESTROY);
541 sk->sk_socket = NULL;
542 break;
543
544 default:
545 sk->sk_socket = NULL;
546 break;
547 }
548
549 sock->sk = NULL;
550 release_sock(sk);
551 sock_put(sk);
552
553 return 0;
554 }
555
556 static int nr_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
557 {
558 struct sock *sk = sock->sk;
559 struct nr_sock *nr = nr_sk(sk);
560 struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr;
561 struct net_device *dev;
562 ax25_uid_assoc *user;
563 ax25_address *source;
564
565 lock_sock(sk);
566 if (!sock_flag(sk, SOCK_ZAPPED)) {
567 release_sock(sk);
568 return -EINVAL;
569 }
570 if (addr_len < sizeof(struct sockaddr_ax25) || addr_len > sizeof(struct full_sockaddr_ax25)) {
571 release_sock(sk);
572 return -EINVAL;
573 }
574 if (addr_len < (addr->fsa_ax25.sax25_ndigis * sizeof(ax25_address) + sizeof(struct sockaddr_ax25))) {
575 release_sock(sk);
576 return -EINVAL;
577 }
578 if (addr->fsa_ax25.sax25_family != AF_NETROM) {
579 release_sock(sk);
580 return -EINVAL;
581 }
582 if ((dev = nr_dev_get(&addr->fsa_ax25.sax25_call)) == NULL) {
583 SOCK_DEBUG(sk, "NET/ROM: bind failed: invalid node callsign\n");
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 -EACCES;
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 SOCK_DEBUG(sk, "NET/ROM: socket is bound\n");
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->sk_sleep, &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->sk_sleep, &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 {
765 struct sk_buff *skb;
766 struct sock *newsk;
767 DEFINE_WAIT(wait);
768 struct sock *sk;
769 int err = 0;
770
771 if ((sk = sock->sk) == NULL)
772 return -EINVAL;
773
774 lock_sock(sk);
775 if (sk->sk_type != SOCK_SEQPACKET) {
776 err = -EOPNOTSUPP;
777 goto out_release;
778 }
779
780 if (sk->sk_state != TCP_LISTEN) {
781 err = -EINVAL;
782 goto out_release;
783 }
784
785 /*
786 * The write queue this time is holding sockets ready to use
787 * hooked into the SABM we saved
788 */
789 for (;;) {
790 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
791 skb = skb_dequeue(&sk->sk_receive_queue);
792 if (skb)
793 break;
794
795 if (flags & O_NONBLOCK) {
796 err = -EWOULDBLOCK;
797 break;
798 }
799 if (!signal_pending(current)) {
800 release_sock(sk);
801 schedule();
802 lock_sock(sk);
803 continue;
804 }
805 err = -ERESTARTSYS;
806 break;
807 }
808 finish_wait(sk->sk_sleep, &wait);
809 if (err)
810 goto out_release;
811
812 newsk = skb->sk;
813 newsk->sk_socket = newsock;
814 newsk->sk_sleep = &newsock->wait;
815
816 /* Now attach up the new socket */
817 kfree_skb(skb);
818 sk_acceptq_removed(sk);
819 newsock->sk = newsk;
820
821 out_release:
822 release_sock(sk);
823
824 return err;
825 }
826
827 static int nr_getname(struct socket *sock, struct sockaddr *uaddr,
828 int *uaddr_len, int peer)
829 {
830 struct full_sockaddr_ax25 *sax = (struct full_sockaddr_ax25 *)uaddr;
831 struct sock *sk = sock->sk;
832 struct nr_sock *nr = nr_sk(sk);
833
834 lock_sock(sk);
835 if (peer != 0) {
836 if (sk->sk_state != TCP_ESTABLISHED) {
837 release_sock(sk);
838 return -ENOTCONN;
839 }
840 sax->fsa_ax25.sax25_family = AF_NETROM;
841 sax->fsa_ax25.sax25_ndigis = 1;
842 sax->fsa_ax25.sax25_call = nr->user_addr;
843 sax->fsa_digipeater[0] = nr->dest_addr;
844 *uaddr_len = sizeof(struct full_sockaddr_ax25);
845 } else {
846 sax->fsa_ax25.sax25_family = AF_NETROM;
847 sax->fsa_ax25.sax25_ndigis = 0;
848 sax->fsa_ax25.sax25_call = nr->source_addr;
849 *uaddr_len = sizeof(struct sockaddr_ax25);
850 }
851 release_sock(sk);
852
853 return 0;
854 }
855
856 int nr_rx_frame(struct sk_buff *skb, struct net_device *dev)
857 {
858 struct sock *sk;
859 struct sock *make;
860 struct nr_sock *nr_make;
861 ax25_address *src, *dest, *user;
862 unsigned short circuit_index, circuit_id;
863 unsigned short peer_circuit_index, peer_circuit_id;
864 unsigned short frametype, flags, window, timeout;
865 int ret;
866
867 skb->sk = NULL; /* Initially we don't know who it's for */
868
869 /*
870 * skb->data points to the netrom frame start
871 */
872
873 src = (ax25_address *)(skb->data + 0);
874 dest = (ax25_address *)(skb->data + 7);
875
876 circuit_index = skb->data[15];
877 circuit_id = skb->data[16];
878 peer_circuit_index = skb->data[17];
879 peer_circuit_id = skb->data[18];
880 frametype = skb->data[19] & 0x0F;
881 flags = skb->data[19] & 0xF0;
882
883 /*
884 * Check for an incoming IP over NET/ROM frame.
885 */
886 if (frametype == NR_PROTOEXT &&
887 circuit_index == NR_PROTO_IP && circuit_id == NR_PROTO_IP) {
888 skb_pull(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN);
889 skb_reset_transport_header(skb);
890
891 return nr_rx_ip(skb, dev);
892 }
893
894 /*
895 * Find an existing socket connection, based on circuit ID, if it's
896 * a Connect Request base it on their circuit ID.
897 *
898 * Circuit ID 0/0 is not valid but it could still be a "reset" for a
899 * circuit that no longer exists at the other end ...
900 */
901
902 sk = NULL;
903
904 if (circuit_index == 0 && circuit_id == 0) {
905 if (frametype == NR_CONNACK && flags == NR_CHOKE_FLAG)
906 sk = nr_find_peer(peer_circuit_index, peer_circuit_id, src);
907 } else {
908 if (frametype == NR_CONNREQ)
909 sk = nr_find_peer(circuit_index, circuit_id, src);
910 else
911 sk = nr_find_socket(circuit_index, circuit_id);
912 }
913
914 if (sk != NULL) {
915 skb_reset_transport_header(skb);
916
917 if (frametype == NR_CONNACK && skb->len == 22)
918 nr_sk(sk)->bpqext = 1;
919 else
920 nr_sk(sk)->bpqext = 0;
921
922 ret = nr_process_rx_frame(sk, skb);
923 bh_unlock_sock(sk);
924 return ret;
925 }
926
927 /*
928 * Now it should be a CONNREQ.
929 */
930 if (frametype != NR_CONNREQ) {
931 /*
932 * Here it would be nice to be able to send a reset but
933 * NET/ROM doesn't have one. We've tried to extend the protocol
934 * by sending NR_CONNACK | NR_CHOKE_FLAGS replies but that
935 * apparently kills BPQ boxes... :-(
936 * So now we try to follow the established behaviour of
937 * G8PZT's Xrouter which is sending packets with command type 7
938 * as an extension of the protocol.
939 */
940 if (sysctl_netrom_reset_circuit &&
941 (frametype != NR_RESET || flags != 0))
942 nr_transmit_reset(skb, 1);
943
944 return 0;
945 }
946
947 sk = nr_find_listener(dest);
948
949 user = (ax25_address *)(skb->data + 21);
950
951 if (sk == NULL || sk_acceptq_is_full(sk) ||
952 (make = nr_make_new(sk)) == NULL) {
953 nr_transmit_refusal(skb, 0);
954 if (sk)
955 bh_unlock_sock(sk);
956 return 0;
957 }
958
959 window = skb->data[20];
960
961 skb->sk = make;
962 make->sk_state = TCP_ESTABLISHED;
963
964 /* Fill in his circuit details */
965 nr_make = nr_sk(make);
966 nr_make->source_addr = *dest;
967 nr_make->dest_addr = *src;
968 nr_make->user_addr = *user;
969
970 nr_make->your_index = circuit_index;
971 nr_make->your_id = circuit_id;
972
973 bh_unlock_sock(sk);
974 circuit = nr_find_next_circuit();
975 bh_lock_sock(sk);
976
977 nr_make->my_index = circuit / 256;
978 nr_make->my_id = circuit % 256;
979
980 circuit++;
981
982 /* Window negotiation */
983 if (window < nr_make->window)
984 nr_make->window = window;
985
986 /* L4 timeout negotiation */
987 if (skb->len == 37) {
988 timeout = skb->data[36] * 256 + skb->data[35];
989 if (timeout * HZ < nr_make->t1)
990 nr_make->t1 = timeout * HZ;
991 nr_make->bpqext = 1;
992 } else {
993 nr_make->bpqext = 0;
994 }
995
996 nr_write_internal(make, NR_CONNACK);
997
998 nr_make->condition = 0x00;
999 nr_make->vs = 0;
1000 nr_make->va = 0;
1001 nr_make->vr = 0;
1002 nr_make->vl = 0;
1003 nr_make->state = NR_STATE_3;
1004 sk_acceptq_added(sk);
1005 skb_queue_head(&sk->sk_receive_queue, skb);
1006
1007 if (!sock_flag(sk, SOCK_DEAD))
1008 sk->sk_data_ready(sk, skb->len);
1009
1010 bh_unlock_sock(sk);
1011
1012 nr_insert_socket(make);
1013
1014 nr_start_heartbeat(make);
1015 nr_start_idletimer(make);
1016
1017 return 1;
1018 }
1019
1020 static int nr_sendmsg(struct kiocb *iocb, struct socket *sock,
1021 struct msghdr *msg, size_t len)
1022 {
1023 struct sock *sk = sock->sk;
1024 struct nr_sock *nr = nr_sk(sk);
1025 struct sockaddr_ax25 *usax = (struct sockaddr_ax25 *)msg->msg_name;
1026 int err;
1027 struct sockaddr_ax25 sax;
1028 struct sk_buff *skb;
1029 unsigned char *asmptr;
1030 int size;
1031
1032 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT))
1033 return -EINVAL;
1034
1035 lock_sock(sk);
1036 if (sock_flag(sk, SOCK_ZAPPED)) {
1037 err = -EADDRNOTAVAIL;
1038 goto out;
1039 }
1040
1041 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1042 send_sig(SIGPIPE, current, 0);
1043 err = -EPIPE;
1044 goto out;
1045 }
1046
1047 if (nr->device == NULL) {
1048 err = -ENETUNREACH;
1049 goto out;
1050 }
1051
1052 if (usax) {
1053 if (msg->msg_namelen < sizeof(sax)) {
1054 err = -EINVAL;
1055 goto out;
1056 }
1057 sax = *usax;
1058 if (ax25cmp(&nr->dest_addr, &sax.sax25_call) != 0) {
1059 err = -EISCONN;
1060 goto out;
1061 }
1062 if (sax.sax25_family != AF_NETROM) {
1063 err = -EINVAL;
1064 goto out;
1065 }
1066 } else {
1067 if (sk->sk_state != TCP_ESTABLISHED) {
1068 err = -ENOTCONN;
1069 goto out;
1070 }
1071 sax.sax25_family = AF_NETROM;
1072 sax.sax25_call = nr->dest_addr;
1073 }
1074
1075 SOCK_DEBUG(sk, "NET/ROM: sendto: Addresses built.\n");
1076
1077 /* Build a packet */
1078 SOCK_DEBUG(sk, "NET/ROM: sendto: building packet.\n");
1079 size = len + NR_NETWORK_LEN + NR_TRANSPORT_LEN;
1080
1081 if ((skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL)
1082 goto out;
1083
1084 skb_reserve(skb, size - len);
1085 skb_reset_transport_header(skb);
1086
1087 /*
1088 * Push down the NET/ROM header
1089 */
1090
1091 asmptr = skb_push(skb, NR_TRANSPORT_LEN);
1092 SOCK_DEBUG(sk, "Building NET/ROM Header.\n");
1093
1094 /* Build a NET/ROM Transport header */
1095
1096 *asmptr++ = nr->your_index;
1097 *asmptr++ = nr->your_id;
1098 *asmptr++ = 0; /* To be filled in later */
1099 *asmptr++ = 0; /* Ditto */
1100 *asmptr++ = NR_INFO;
1101 SOCK_DEBUG(sk, "Built header.\n");
1102
1103 /*
1104 * Put the data on the end
1105 */
1106 skb_put(skb, len);
1107
1108 SOCK_DEBUG(sk, "NET/ROM: Appending user data\n");
1109
1110 /* User data follows immediately after the NET/ROM transport header */
1111 if (memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len)) {
1112 kfree_skb(skb);
1113 err = -EFAULT;
1114 goto out;
1115 }
1116
1117 SOCK_DEBUG(sk, "NET/ROM: Transmitting buffer\n");
1118
1119 if (sk->sk_state != TCP_ESTABLISHED) {
1120 kfree_skb(skb);
1121 err = -ENOTCONN;
1122 goto out;
1123 }
1124
1125 nr_output(sk, skb); /* Shove it onto the queue */
1126
1127 err = len;
1128 out:
1129 release_sock(sk);
1130 return err;
1131 }
1132
1133 static int nr_recvmsg(struct kiocb *iocb, struct socket *sock,
1134 struct msghdr *msg, size_t size, int flags)
1135 {
1136 struct sock *sk = sock->sk;
1137 struct sockaddr_ax25 *sax = (struct sockaddr_ax25 *)msg->msg_name;
1138 size_t copied;
1139 struct sk_buff *skb;
1140 int er;
1141
1142 /*
1143 * This works for seqpacket too. The receiver has ordered the queue for
1144 * us! We do one quick check first though
1145 */
1146
1147 lock_sock(sk);
1148 if (sk->sk_state != TCP_ESTABLISHED) {
1149 release_sock(sk);
1150 return -ENOTCONN;
1151 }
1152
1153 /* Now we can treat all alike */
1154 if ((skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, flags & MSG_DONTWAIT, &er)) == NULL) {
1155 release_sock(sk);
1156 return er;
1157 }
1158
1159 skb_reset_transport_header(skb);
1160 copied = skb->len;
1161
1162 if (copied > size) {
1163 copied = size;
1164 msg->msg_flags |= MSG_TRUNC;
1165 }
1166
1167 skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1168
1169 if (sax != NULL) {
1170 sax->sax25_family = AF_NETROM;
1171 skb_copy_from_linear_data_offset(skb, 7, sax->sax25_call.ax25_call,
1172 AX25_ADDR_LEN);
1173 }
1174
1175 msg->msg_namelen = sizeof(*sax);
1176
1177 skb_free_datagram(sk, skb);
1178
1179 release_sock(sk);
1180 return copied;
1181 }
1182
1183
1184 static int nr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1185 {
1186 struct sock *sk = sock->sk;
1187 void __user *argp = (void __user *)arg;
1188 int ret;
1189
1190 switch (cmd) {
1191 case TIOCOUTQ: {
1192 long amount;
1193
1194 lock_sock(sk);
1195 amount = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc);
1196 if (amount < 0)
1197 amount = 0;
1198 release_sock(sk);
1199 return put_user(amount, (int __user *)argp);
1200 }
1201
1202 case TIOCINQ: {
1203 struct sk_buff *skb;
1204 long amount = 0L;
1205
1206 lock_sock(sk);
1207 /* These two are safe on a single CPU system as only user tasks fiddle here */
1208 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1209 amount = skb->len;
1210 release_sock(sk);
1211 return put_user(amount, (int __user *)argp);
1212 }
1213
1214 case SIOCGSTAMP:
1215 lock_sock(sk);
1216 ret = sock_get_timestamp(sk, argp);
1217 release_sock(sk);
1218 return ret;
1219
1220 case SIOCGSTAMPNS:
1221 lock_sock(sk);
1222 ret = sock_get_timestampns(sk, argp);
1223 release_sock(sk);
1224 return ret;
1225
1226 case SIOCGIFADDR:
1227 case SIOCSIFADDR:
1228 case SIOCGIFDSTADDR:
1229 case SIOCSIFDSTADDR:
1230 case SIOCGIFBRDADDR:
1231 case SIOCSIFBRDADDR:
1232 case SIOCGIFNETMASK:
1233 case SIOCSIFNETMASK:
1234 case SIOCGIFMETRIC:
1235 case SIOCSIFMETRIC:
1236 return -EINVAL;
1237
1238 case SIOCADDRT:
1239 case SIOCDELRT:
1240 case SIOCNRDECOBS:
1241 if (!capable(CAP_NET_ADMIN)) return -EPERM;
1242 return nr_rt_ioctl(cmd, argp);
1243
1244 default:
1245 return -ENOIOCTLCMD;
1246 }
1247
1248 return 0;
1249 }
1250
1251 #ifdef CONFIG_PROC_FS
1252
1253 static void *nr_info_start(struct seq_file *seq, loff_t *pos)
1254 {
1255 struct sock *s;
1256 struct hlist_node *node;
1257 int i = 1;
1258
1259 spin_lock_bh(&nr_list_lock);
1260 if (*pos == 0)
1261 return SEQ_START_TOKEN;
1262
1263 sk_for_each(s, node, &nr_list) {
1264 if (i == *pos)
1265 return s;
1266 ++i;
1267 }
1268 return NULL;
1269 }
1270
1271 static void *nr_info_next(struct seq_file *seq, void *v, loff_t *pos)
1272 {
1273 ++*pos;
1274
1275 return (v == SEQ_START_TOKEN) ? sk_head(&nr_list)
1276 : sk_next((struct sock *)v);
1277 }
1278
1279 static void nr_info_stop(struct seq_file *seq, void *v)
1280 {
1281 spin_unlock_bh(&nr_list_lock);
1282 }
1283
1284 static int nr_info_show(struct seq_file *seq, void *v)
1285 {
1286 struct sock *s = v;
1287 struct net_device *dev;
1288 struct nr_sock *nr;
1289 const char *devname;
1290 char buf[11];
1291
1292 if (v == SEQ_START_TOKEN)
1293 seq_puts(seq,
1294 "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");
1295
1296 else {
1297
1298 bh_lock_sock(s);
1299 nr = nr_sk(s);
1300
1301 if ((dev = nr->device) == NULL)
1302 devname = "???";
1303 else
1304 devname = dev->name;
1305
1306 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->user_addr));
1307 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->dest_addr));
1308 seq_printf(seq,
1309 "%-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",
1310 ax2asc(buf, &nr->source_addr),
1311 devname,
1312 nr->my_index,
1313 nr->my_id,
1314 nr->your_index,
1315 nr->your_id,
1316 nr->state,
1317 nr->vs,
1318 nr->vr,
1319 nr->va,
1320 ax25_display_timer(&nr->t1timer) / HZ,
1321 nr->t1 / HZ,
1322 ax25_display_timer(&nr->t2timer) / HZ,
1323 nr->t2 / HZ,
1324 ax25_display_timer(&nr->t4timer) / HZ,
1325 nr->t4 / HZ,
1326 ax25_display_timer(&nr->idletimer) / (60 * HZ),
1327 nr->idle / (60 * HZ),
1328 nr->n2count,
1329 nr->n2,
1330 nr->window,
1331 atomic_read(&s->sk_wmem_alloc),
1332 atomic_read(&s->sk_rmem_alloc),
1333 s->sk_socket ? SOCK_INODE(s->sk_socket)->i_ino : 0L);
1334
1335 bh_unlock_sock(s);
1336 }
1337 return 0;
1338 }
1339
1340 static const struct seq_operations nr_info_seqops = {
1341 .start = nr_info_start,
1342 .next = nr_info_next,
1343 .stop = nr_info_stop,
1344 .show = nr_info_show,
1345 };
1346
1347 static int nr_info_open(struct inode *inode, struct file *file)
1348 {
1349 return seq_open(file, &nr_info_seqops);
1350 }
1351
1352 static const struct file_operations nr_info_fops = {
1353 .owner = THIS_MODULE,
1354 .open = nr_info_open,
1355 .read = seq_read,
1356 .llseek = seq_lseek,
1357 .release = seq_release,
1358 };
1359 #endif /* CONFIG_PROC_FS */
1360
1361 static struct net_proto_family nr_family_ops = {
1362 .family = PF_NETROM,
1363 .create = nr_create,
1364 .owner = THIS_MODULE,
1365 };
1366
1367 static const struct proto_ops nr_proto_ops = {
1368 .family = PF_NETROM,
1369 .owner = THIS_MODULE,
1370 .release = nr_release,
1371 .bind = nr_bind,
1372 .connect = nr_connect,
1373 .socketpair = sock_no_socketpair,
1374 .accept = nr_accept,
1375 .getname = nr_getname,
1376 .poll = datagram_poll,
1377 .ioctl = nr_ioctl,
1378 .listen = nr_listen,
1379 .shutdown = sock_no_shutdown,
1380 .setsockopt = nr_setsockopt,
1381 .getsockopt = nr_getsockopt,
1382 .sendmsg = nr_sendmsg,
1383 .recvmsg = nr_recvmsg,
1384 .mmap = sock_no_mmap,
1385 .sendpage = sock_no_sendpage,
1386 };
1387
1388 static struct notifier_block nr_dev_notifier = {
1389 .notifier_call = nr_device_event,
1390 };
1391
1392 static struct net_device **dev_nr;
1393
1394 static struct ax25_protocol nr_pid = {
1395 .pid = AX25_P_NETROM,
1396 .func = nr_route_frame
1397 };
1398
1399 static struct ax25_linkfail nr_linkfail_notifier = {
1400 .func = nr_link_failed,
1401 };
1402
1403 static int __init nr_proto_init(void)
1404 {
1405 int i;
1406 int rc = proto_register(&nr_proto, 0);
1407
1408 if (rc != 0)
1409 goto out;
1410
1411 if (nr_ndevs > 0x7fffffff/sizeof(struct net_device *)) {
1412 printk(KERN_ERR "NET/ROM: nr_proto_init - nr_ndevs parameter to large\n");
1413 return -1;
1414 }
1415
1416 dev_nr = kzalloc(nr_ndevs * sizeof(struct net_device *), GFP_KERNEL);
1417 if (dev_nr == NULL) {
1418 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device array\n");
1419 return -1;
1420 }
1421
1422 for (i = 0; i < nr_ndevs; i++) {
1423 char name[IFNAMSIZ];
1424 struct net_device *dev;
1425
1426 sprintf(name, "nr%d", i);
1427 dev = alloc_netdev(sizeof(struct nr_private), name, nr_setup);
1428 if (!dev) {
1429 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device structure\n");
1430 goto fail;
1431 }
1432
1433 dev->base_addr = i;
1434 if (register_netdev(dev)) {
1435 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register network device\n");
1436 free_netdev(dev);
1437 goto fail;
1438 }
1439 lockdep_set_class(&dev->_xmit_lock, &nr_netdev_xmit_lock_key);
1440 dev_nr[i] = dev;
1441 }
1442
1443 if (sock_register(&nr_family_ops)) {
1444 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register socket family\n");
1445 goto fail;
1446 }
1447
1448 register_netdevice_notifier(&nr_dev_notifier);
1449
1450 ax25_register_pid(&nr_pid);
1451 ax25_linkfail_register(&nr_linkfail_notifier);
1452
1453 #ifdef CONFIG_SYSCTL
1454 nr_register_sysctl();
1455 #endif
1456
1457 nr_loopback_init();
1458
1459 proc_net_fops_create(&init_net, "nr", S_IRUGO, &nr_info_fops);
1460 proc_net_fops_create(&init_net, "nr_neigh", S_IRUGO, &nr_neigh_fops);
1461 proc_net_fops_create(&init_net, "nr_nodes", S_IRUGO, &nr_nodes_fops);
1462 out:
1463 return rc;
1464 fail:
1465 while (--i >= 0) {
1466 unregister_netdev(dev_nr[i]);
1467 free_netdev(dev_nr[i]);
1468 }
1469 kfree(dev_nr);
1470 proto_unregister(&nr_proto);
1471 rc = -1;
1472 goto out;
1473 }
1474
1475 module_init(nr_proto_init);
1476
1477 module_param(nr_ndevs, int, 0);
1478 MODULE_PARM_DESC(nr_ndevs, "number of NET/ROM devices");
1479
1480 MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>");
1481 MODULE_DESCRIPTION("The amateur radio NET/ROM network and transport layer protocol");
1482 MODULE_LICENSE("GPL");
1483 MODULE_ALIAS_NETPROTO(PF_NETROM);
1484
1485 static void __exit nr_exit(void)
1486 {
1487 int i;
1488
1489 proc_net_remove(&init_net, "nr");
1490 proc_net_remove(&init_net, "nr_neigh");
1491 proc_net_remove(&init_net, "nr_nodes");
1492 nr_loopback_clear();
1493
1494 nr_rt_free();
1495
1496 #ifdef CONFIG_SYSCTL
1497 nr_unregister_sysctl();
1498 #endif
1499
1500 ax25_linkfail_release(&nr_linkfail_notifier);
1501 ax25_protocol_release(AX25_P_NETROM);
1502
1503 unregister_netdevice_notifier(&nr_dev_notifier);
1504
1505 sock_unregister(PF_NETROM);
1506
1507 for (i = 0; i < nr_ndevs; i++) {
1508 struct net_device *dev = dev_nr[i];
1509 if (dev) {
1510 unregister_netdev(dev);
1511 free_netdev(dev);
1512 }
1513 }
1514
1515 kfree(dev_nr);
1516 proto_unregister(&nr_proto);
1517 }
1518 module_exit(nr_exit);
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