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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
[linux-2.6/libata-dev.git] / net / netrom / af_netrom.c
blob7261eb81974ff9f3761976372c9272db04a62abd
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 <linux/fcntl.h>
35 #include <linux/termios.h> /* For TIOCINQ/OUTQ */
36 #include <linux/mm.h>
37 #include <linux/interrupt.h>
38 #include <linux/notifier.h>
39 #include <net/netrom.h>
40 #include <linux/proc_fs.h>
41 #include <linux/seq_file.h>
42 #include <net/ip.h>
43 #include <net/tcp_states.h>
44 #include <net/arp.h>
45 #include <linux/init.h>
46
47 static int nr_ndevs = 4;
48
49 int sysctl_netrom_default_path_quality = NR_DEFAULT_QUAL;
50 int sysctl_netrom_obsolescence_count_initialiser = NR_DEFAULT_OBS;
51 int sysctl_netrom_network_ttl_initialiser = NR_DEFAULT_TTL;
52 int sysctl_netrom_transport_timeout = NR_DEFAULT_T1;
53 int sysctl_netrom_transport_maximum_tries = NR_DEFAULT_N2;
54 int sysctl_netrom_transport_acknowledge_delay = NR_DEFAULT_T2;
55 int sysctl_netrom_transport_busy_delay = NR_DEFAULT_T4;
56 int sysctl_netrom_transport_requested_window_size = NR_DEFAULT_WINDOW;
57 int sysctl_netrom_transport_no_activity_timeout = NR_DEFAULT_IDLE;
58 int sysctl_netrom_routing_control = NR_DEFAULT_ROUTING;
59 int sysctl_netrom_link_fails_count = NR_DEFAULT_FAILS;
60 int sysctl_netrom_reset_circuit = NR_DEFAULT_RESET;
61
62 static unsigned short circuit = 0x101;
63
64 static HLIST_HEAD(nr_list);
65 static DEFINE_SPINLOCK(nr_list_lock);
66
67 static const struct proto_ops nr_proto_ops;
68
69 /*
70 * NETROM network devices are virtual network devices encapsulating NETROM
71 * frames into AX.25 which will be sent through an AX.25 device, so form a
72 * special "super class" of normal net devices; split their locks off into a
73 * separate class since they always nest.
74 */
75 static struct lock_class_key nr_netdev_xmit_lock_key;
76 static struct lock_class_key nr_netdev_addr_lock_key;
77
78 static void nr_set_lockdep_one(struct net_device *dev,
79 struct netdev_queue *txq,
80 void *_unused)
81 {
82 lockdep_set_class(&txq->_xmit_lock, &nr_netdev_xmit_lock_key);
83 }
84
85 static void nr_set_lockdep_key(struct net_device *dev)
86 {
87 lockdep_set_class(&dev->addr_list_lock, &nr_netdev_addr_lock_key);
88 netdev_for_each_tx_queue(dev, nr_set_lockdep_one, NULL);
89 }
90
91 /*
92 * Socket removal during an interrupt is now safe.
93 */
94 static void nr_remove_socket(struct sock *sk)
95 {
96 spin_lock_bh(&nr_list_lock);
97 sk_del_node_init(sk);
98 spin_unlock_bh(&nr_list_lock);
99 }
100
101 /*
102 * Kill all bound sockets on a dropped device.
103 */
104 static void nr_kill_by_device(struct net_device *dev)
105 {
106 struct sock *s;
107 struct hlist_node *node;
108
109 spin_lock_bh(&nr_list_lock);
110 sk_for_each(s, node, &nr_list)
111 if (nr_sk(s)->device == dev)
112 nr_disconnect(s, ENETUNREACH);
113 spin_unlock_bh(&nr_list_lock);
114 }
115
116 /*
117 * Handle device status changes.
118 */
119 static int nr_device_event(struct notifier_block *this, unsigned long event, void *ptr)
120 {
121 struct net_device *dev = (struct net_device *)ptr;
122
123 if (!net_eq(dev_net(dev), &init_net))
124 return NOTIFY_DONE;
125
126 if (event != NETDEV_DOWN)
127 return NOTIFY_DONE;
128
129 nr_kill_by_device(dev);
130 nr_rt_device_down(dev);
131
132 return NOTIFY_DONE;
133 }
134
135 /*
136 * Add a socket to the bound sockets list.
137 */
138 static void nr_insert_socket(struct sock *sk)
139 {
140 spin_lock_bh(&nr_list_lock);
141 sk_add_node(sk, &nr_list);
142 spin_unlock_bh(&nr_list_lock);
143 }
144
145 /*
146 * Find a socket that wants to accept the Connect Request we just
147 * received.
148 */
149 static struct sock *nr_find_listener(ax25_address *addr)
150 {
151 struct sock *s;
152 struct hlist_node *node;
153
154 spin_lock_bh(&nr_list_lock);
155 sk_for_each(s, node, &nr_list)
156 if (!ax25cmp(&nr_sk(s)->source_addr, addr) &&
157 s->sk_state == TCP_LISTEN) {
158 bh_lock_sock(s);
159 goto found;
160 }
161 s = NULL;
162 found:
163 spin_unlock_bh(&nr_list_lock);
164 return s;
165 }
166
167 /*
168 * Find a connected NET/ROM socket given my circuit IDs.
169 */
170 static struct sock *nr_find_socket(unsigned char index, unsigned char id)
171 {
172 struct sock *s;
173 struct hlist_node *node;
174
175 spin_lock_bh(&nr_list_lock);
176 sk_for_each(s, node, &nr_list) {
177 struct nr_sock *nr = nr_sk(s);
178
179 if (nr->my_index == index && nr->my_id == id) {
180 bh_lock_sock(s);
181 goto found;
182 }
183 }
184 s = NULL;
185 found:
186 spin_unlock_bh(&nr_list_lock);
187 return s;
188 }
189
190 /*
191 * Find a connected NET/ROM socket given their circuit IDs.
192 */
193 static struct sock *nr_find_peer(unsigned char index, unsigned char id,
194 ax25_address *dest)
195 {
196 struct sock *s;
197 struct hlist_node *node;
198
199 spin_lock_bh(&nr_list_lock);
200 sk_for_each(s, node, &nr_list) {
201 struct nr_sock *nr = nr_sk(s);
202
203 if (nr->your_index == index && nr->your_id == id &&
204 !ax25cmp(&nr->dest_addr, dest)) {
205 bh_lock_sock(s);
206 goto found;
207 }
208 }
209 s = NULL;
210 found:
211 spin_unlock_bh(&nr_list_lock);
212 return s;
213 }
214
215 /*
216 * Find next free circuit ID.
217 */
218 static unsigned short nr_find_next_circuit(void)
219 {
220 unsigned short id = circuit;
221 unsigned char i, j;
222 struct sock *sk;
223
224 for (;;) {
225 i = id / 256;
226 j = id % 256;
227
228 if (i != 0 && j != 0) {
229 if ((sk=nr_find_socket(i, j)) == NULL)
230 break;
231 bh_unlock_sock(sk);
232 }
233
234 id++;
235 }
236
237 return id;
238 }
239
240 /*
241 * Deferred destroy.
242 */
243 void nr_destroy_socket(struct sock *);
244
245 /*
246 * Handler for deferred kills.
247 */
248 static void nr_destroy_timer(unsigned long data)
249 {
250 struct sock *sk=(struct sock *)data;
251 bh_lock_sock(sk);
252 sock_hold(sk);
253 nr_destroy_socket(sk);
254 bh_unlock_sock(sk);
255 sock_put(sk);
256 }
257
258 /*
259 * This is called from user mode and the timers. Thus it protects itself
260 * against interrupt users but doesn't worry about being called during
261 * work. Once it is removed from the queue no interrupt or bottom half
262 * will touch it and we are (fairly 8-) ) safe.
263 */
264 void nr_destroy_socket(struct sock *sk)
265 {
266 struct sk_buff *skb;
267
268 nr_remove_socket(sk);
269
270 nr_stop_heartbeat(sk);
271 nr_stop_t1timer(sk);
272 nr_stop_t2timer(sk);
273 nr_stop_t4timer(sk);
274 nr_stop_idletimer(sk);
275
276 nr_clear_queues(sk); /* Flush the queues */
277
278 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
279 if (skb->sk != sk) { /* A pending connection */
280 /* Queue the unaccepted socket for death */
281 sock_set_flag(skb->sk, SOCK_DEAD);
282 nr_start_heartbeat(skb->sk);
283 nr_sk(skb->sk)->state = NR_STATE_0;
284 }
285
286 kfree_skb(skb);
287 }
288
289 if (sk_has_allocations(sk)) {
290 /* Defer: outstanding buffers */
291 sk->sk_timer.function = nr_destroy_timer;
292 sk->sk_timer.expires = jiffies + 2 * HZ;
293 add_timer(&sk->sk_timer);
294 } else
295 sock_put(sk);
296 }
297
298 /*
299 * Handling for system calls applied via the various interfaces to a
300 * NET/ROM socket object.
301 */
302
303 static int nr_setsockopt(struct socket *sock, int level, int optname,
304 char __user *optval, unsigned int optlen)
305 {
306 struct sock *sk = sock->sk;
307 struct nr_sock *nr = nr_sk(sk);
308 unsigned long opt;
309
310 if (level != SOL_NETROM)
311 return -ENOPROTOOPT;
312
313 if (optlen < sizeof(unsigned int))
314 return -EINVAL;
315
316 if (get_user(opt, (unsigned int __user *)optval))
317 return -EFAULT;
318
319 switch (optname) {
320 case NETROM_T1:
321 if (opt < 1 || opt > ULONG_MAX / HZ)
322 return -EINVAL;
323 nr->t1 = opt * HZ;
324 return 0;
325
326 case NETROM_T2:
327 if (opt < 1 || opt > ULONG_MAX / HZ)
328 return -EINVAL;
329 nr->t2 = opt * HZ;
330 return 0;
331
332 case NETROM_N2:
333 if (opt < 1 || opt > 31)
334 return -EINVAL;
335 nr->n2 = opt;
336 return 0;
337
338 case NETROM_T4:
339 if (opt < 1 || opt > ULONG_MAX / HZ)
340 return -EINVAL;
341 nr->t4 = opt * HZ;
342 return 0;
343
344 case NETROM_IDLE:
345 if (opt > ULONG_MAX / (60 * HZ))
346 return -EINVAL;
347 nr->idle = opt * 60 * HZ;
348 return 0;
349
350 default:
351 return -ENOPROTOOPT;
352 }
353 }
354
355 static int nr_getsockopt(struct socket *sock, int level, int optname,
356 char __user *optval, int __user *optlen)
357 {
358 struct sock *sk = sock->sk;
359 struct nr_sock *nr = nr_sk(sk);
360 int val = 0;
361 int len;
362
363 if (level != SOL_NETROM)
364 return -ENOPROTOOPT;
365
366 if (get_user(len, optlen))
367 return -EFAULT;
368
369 if (len < 0)
370 return -EINVAL;
371
372 switch (optname) {
373 case NETROM_T1:
374 val = nr->t1 / HZ;
375 break;
376
377 case NETROM_T2:
378 val = nr->t2 / HZ;
379 break;
380
381 case NETROM_N2:
382 val = nr->n2;
383 break;
384
385 case NETROM_T4:
386 val = nr->t4 / HZ;
387 break;
388
389 case NETROM_IDLE:
390 val = nr->idle / (60 * HZ);
391 break;
392
393 default:
394 return -ENOPROTOOPT;
395 }
396
397 len = min_t(unsigned int, len, sizeof(int));
398
399 if (put_user(len, optlen))
400 return -EFAULT;
401
402 return copy_to_user(optval, &val, len) ? -EFAULT : 0;
403 }
404
405 static int nr_listen(struct socket *sock, int backlog)
406 {
407 struct sock *sk = sock->sk;
408
409 lock_sock(sk);
410 if (sk->sk_state != TCP_LISTEN) {
411 memset(&nr_sk(sk)->user_addr, 0, AX25_ADDR_LEN);
412 sk->sk_max_ack_backlog = backlog;
413 sk->sk_state = TCP_LISTEN;
414 release_sock(sk);
415 return 0;
416 }
417 release_sock(sk);
418
419 return -EOPNOTSUPP;
420 }
421
422 static struct proto nr_proto = {
423 .name = "NETROM",
424 .owner = THIS_MODULE,
425 .obj_size = sizeof(struct nr_sock),
426 };
427
428 static int nr_create(struct net *net, struct socket *sock, int protocol,
429 int kern)
430 {
431 struct sock *sk;
432 struct nr_sock *nr;
433
434 if (!net_eq(net, &init_net))
435 return -EAFNOSUPPORT;
436
437 if (sock->type != SOCK_SEQPACKET || protocol != 0)
438 return -ESOCKTNOSUPPORT;
439
440 sk = sk_alloc(net, PF_NETROM, GFP_ATOMIC, &nr_proto);
441 if (sk == NULL)
442 return -ENOMEM;
443
444 nr = nr_sk(sk);
445
446 sock_init_data(sock, sk);
447
448 sock->ops = &nr_proto_ops;
449 sk->sk_protocol = protocol;
450
451 skb_queue_head_init(&nr->ack_queue);
452 skb_queue_head_init(&nr->reseq_queue);
453 skb_queue_head_init(&nr->frag_queue);
454
455 nr_init_timers(sk);
456
457 nr->t1 =
458 msecs_to_jiffies(sysctl_netrom_transport_timeout);
459 nr->t2 =
460 msecs_to_jiffies(sysctl_netrom_transport_acknowledge_delay);
461 nr->n2 =
462 msecs_to_jiffies(sysctl_netrom_transport_maximum_tries);
463 nr->t4 =
464 msecs_to_jiffies(sysctl_netrom_transport_busy_delay);
465 nr->idle =
466 msecs_to_jiffies(sysctl_netrom_transport_no_activity_timeout);
467 nr->window = sysctl_netrom_transport_requested_window_size;
468
469 nr->bpqext = 1;
470 nr->state = NR_STATE_0;
471
472 return 0;
473 }
474
475 static struct sock *nr_make_new(struct sock *osk)
476 {
477 struct sock *sk;
478 struct nr_sock *nr, *onr;
479
480 if (osk->sk_type != SOCK_SEQPACKET)
481 return NULL;
482
483 sk = sk_alloc(sock_net(osk), PF_NETROM, GFP_ATOMIC, osk->sk_prot);
484 if (sk == NULL)
485 return NULL;
486
487 nr = nr_sk(sk);
488
489 sock_init_data(NULL, sk);
490
491 sk->sk_type = osk->sk_type;
492 sk->sk_priority = osk->sk_priority;
493 sk->sk_protocol = osk->sk_protocol;
494 sk->sk_rcvbuf = osk->sk_rcvbuf;
495 sk->sk_sndbuf = osk->sk_sndbuf;
496 sk->sk_state = TCP_ESTABLISHED;
497 sock_copy_flags(sk, osk);
498
499 skb_queue_head_init(&nr->ack_queue);
500 skb_queue_head_init(&nr->reseq_queue);
501 skb_queue_head_init(&nr->frag_queue);
502
503 nr_init_timers(sk);
504
505 onr = nr_sk(osk);
506
507 nr->t1 = onr->t1;
508 nr->t2 = onr->t2;
509 nr->n2 = onr->n2;
510 nr->t4 = onr->t4;
511 nr->idle = onr->idle;
512 nr->window = onr->window;
513
514 nr->device = onr->device;
515 nr->bpqext = onr->bpqext;
516
517 return sk;
518 }
519
520 static int nr_release(struct socket *sock)
521 {
522 struct sock *sk = sock->sk;
523 struct nr_sock *nr;
524
525 if (sk == NULL) return 0;
526
527 sock_hold(sk);
528 sock_orphan(sk);
529 lock_sock(sk);
530 nr = nr_sk(sk);
531
532 switch (nr->state) {
533 case NR_STATE_0:
534 case NR_STATE_1:
535 case NR_STATE_2:
536 nr_disconnect(sk, 0);
537 nr_destroy_socket(sk);
538 break;
539
540 case NR_STATE_3:
541 nr_clear_queues(sk);
542 nr->n2count = 0;
543 nr_write_internal(sk, NR_DISCREQ);
544 nr_start_t1timer(sk);
545 nr_stop_t2timer(sk);
546 nr_stop_t4timer(sk);
547 nr_stop_idletimer(sk);
548 nr->state = NR_STATE_2;
549 sk->sk_state = TCP_CLOSE;
550 sk->sk_shutdown |= SEND_SHUTDOWN;
551 sk->sk_state_change(sk);
552 sock_set_flag(sk, SOCK_DESTROY);
553 break;
554
555 default:
556 break;
557 }
558
559 sock->sk = NULL;
560 release_sock(sk);
561 sock_put(sk);
562
563 return 0;
564 }
565
566 static int nr_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
567 {
568 struct sock *sk = sock->sk;
569 struct nr_sock *nr = nr_sk(sk);
570 struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr;
571 struct net_device *dev;
572 ax25_uid_assoc *user;
573 ax25_address *source;
574
575 lock_sock(sk);
576 if (!sock_flag(sk, SOCK_ZAPPED)) {
577 release_sock(sk);
578 return -EINVAL;
579 }
580 if (addr_len < sizeof(struct sockaddr_ax25) || addr_len > sizeof(struct full_sockaddr_ax25)) {
581 release_sock(sk);
582 return -EINVAL;
583 }
584 if (addr_len < (addr->fsa_ax25.sax25_ndigis * sizeof(ax25_address) + sizeof(struct sockaddr_ax25))) {
585 release_sock(sk);
586 return -EINVAL;
587 }
588 if (addr->fsa_ax25.sax25_family != AF_NETROM) {
589 release_sock(sk);
590 return -EINVAL;
591 }
592 if ((dev = nr_dev_get(&addr->fsa_ax25.sax25_call)) == NULL) {
593 release_sock(sk);
594 return -EADDRNOTAVAIL;
595 }
596
597 /*
598 * Only the super user can set an arbitrary user callsign.
599 */
600 if (addr->fsa_ax25.sax25_ndigis == 1) {
601 if (!capable(CAP_NET_BIND_SERVICE)) {
602 dev_put(dev);
603 release_sock(sk);
604 return -EPERM;
605 }
606 nr->user_addr = addr->fsa_digipeater[0];
607 nr->source_addr = addr->fsa_ax25.sax25_call;
608 } else {
609 source = &addr->fsa_ax25.sax25_call;
610
611 user = ax25_findbyuid(current_euid());
612 if (user) {
613 nr->user_addr = user->call;
614 ax25_uid_put(user);
615 } else {
616 if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) {
617 release_sock(sk);
618 dev_put(dev);
619 return -EPERM;
620 }
621 nr->user_addr = *source;
622 }
623
624 nr->source_addr = *source;
625 }
626
627 nr->device = dev;
628 nr_insert_socket(sk);
629
630 sock_reset_flag(sk, SOCK_ZAPPED);
631 dev_put(dev);
632 release_sock(sk);
633
634 return 0;
635 }
636
637 static int nr_connect(struct socket *sock, struct sockaddr *uaddr,
638 int addr_len, int flags)
639 {
640 struct sock *sk = sock->sk;
641 struct nr_sock *nr = nr_sk(sk);
642 struct sockaddr_ax25 *addr = (struct sockaddr_ax25 *)uaddr;
643 ax25_address *source = NULL;
644 ax25_uid_assoc *user;
645 struct net_device *dev;
646 int err = 0;
647
648 lock_sock(sk);
649 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
650 sock->state = SS_CONNECTED;
651 goto out_release; /* Connect completed during a ERESTARTSYS event */
652 }
653
654 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
655 sock->state = SS_UNCONNECTED;
656 err = -ECONNREFUSED;
657 goto out_release;
658 }
659
660 if (sk->sk_state == TCP_ESTABLISHED) {
661 err = -EISCONN; /* No reconnect on a seqpacket socket */
662 goto out_release;
663 }
664
665 sk->sk_state = TCP_CLOSE;
666 sock->state = SS_UNCONNECTED;
667
668 if (addr_len != sizeof(struct sockaddr_ax25) && addr_len != sizeof(struct full_sockaddr_ax25)) {
669 err = -EINVAL;
670 goto out_release;
671 }
672 if (addr->sax25_family != AF_NETROM) {
673 err = -EINVAL;
674 goto out_release;
675 }
676 if (sock_flag(sk, SOCK_ZAPPED)) { /* Must bind first - autobinding in this may or may not work */
677 sock_reset_flag(sk, SOCK_ZAPPED);
678
679 if ((dev = nr_dev_first()) == NULL) {
680 err = -ENETUNREACH;
681 goto out_release;
682 }
683 source = (ax25_address *)dev->dev_addr;
684
685 user = ax25_findbyuid(current_euid());
686 if (user) {
687 nr->user_addr = user->call;
688 ax25_uid_put(user);
689 } else {
690 if (ax25_uid_policy && !capable(CAP_NET_ADMIN)) {
691 dev_put(dev);
692 err = -EPERM;
693 goto out_release;
694 }
695 nr->user_addr = *source;
696 }
697
698 nr->source_addr = *source;
699 nr->device = dev;
700
701 dev_put(dev);
702 nr_insert_socket(sk); /* Finish the bind */
703 }
704
705 nr->dest_addr = addr->sax25_call;
706
707 release_sock(sk);
708 circuit = nr_find_next_circuit();
709 lock_sock(sk);
710
711 nr->my_index = circuit / 256;
712 nr->my_id = circuit % 256;
713
714 circuit++;
715
716 /* Move to connecting socket, start sending Connect Requests */
717 sock->state = SS_CONNECTING;
718 sk->sk_state = TCP_SYN_SENT;
719
720 nr_establish_data_link(sk);
721
722 nr->state = NR_STATE_1;
723
724 nr_start_heartbeat(sk);
725
726 /* Now the loop */
727 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) {
728 err = -EINPROGRESS;
729 goto out_release;
730 }
731
732 /*
733 * A Connect Ack with Choke or timeout or failed routing will go to
734 * closed.
735 */
736 if (sk->sk_state == TCP_SYN_SENT) {
737 DEFINE_WAIT(wait);
738
739 for (;;) {
740 prepare_to_wait(sk_sleep(sk), &wait,
741 TASK_INTERRUPTIBLE);
742 if (sk->sk_state != TCP_SYN_SENT)
743 break;
744 if (!signal_pending(current)) {
745 release_sock(sk);
746 schedule();
747 lock_sock(sk);
748 continue;
749 }
750 err = -ERESTARTSYS;
751 break;
752 }
753 finish_wait(sk_sleep(sk), &wait);
754 if (err)
755 goto out_release;
756 }
757
758 if (sk->sk_state != TCP_ESTABLISHED) {
759 sock->state = SS_UNCONNECTED;
760 err = sock_error(sk); /* Always set at this point */
761 goto out_release;
762 }
763
764 sock->state = SS_CONNECTED;
765
766 out_release:
767 release_sock(sk);
768
769 return err;
770 }
771
772 static int nr_accept(struct socket *sock, struct socket *newsock, int flags)
773 {
774 struct sk_buff *skb;
775 struct sock *newsk;
776 DEFINE_WAIT(wait);
777 struct sock *sk;
778 int err = 0;
779
780 if ((sk = sock->sk) == NULL)
781 return -EINVAL;
782
783 lock_sock(sk);
784 if (sk->sk_type != SOCK_SEQPACKET) {
785 err = -EOPNOTSUPP;
786 goto out_release;
787 }
788
789 if (sk->sk_state != TCP_LISTEN) {
790 err = -EINVAL;
791 goto out_release;
792 }
793
794 /*
795 * The write queue this time is holding sockets ready to use
796 * hooked into the SABM we saved
797 */
798 for (;;) {
799 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
800 skb = skb_dequeue(&sk->sk_receive_queue);
801 if (skb)
802 break;
803
804 if (flags & O_NONBLOCK) {
805 err = -EWOULDBLOCK;
806 break;
807 }
808 if (!signal_pending(current)) {
809 release_sock(sk);
810 schedule();
811 lock_sock(sk);
812 continue;
813 }
814 err = -ERESTARTSYS;
815 break;
816 }
817 finish_wait(sk_sleep(sk), &wait);
818 if (err)
819 goto out_release;
820
821 newsk = skb->sk;
822 sock_graft(newsk, newsock);
823
824 /* Now attach up the new socket */
825 kfree_skb(skb);
826 sk_acceptq_removed(sk);
827
828 out_release:
829 release_sock(sk);
830
831 return err;
832 }
833
834 static int nr_getname(struct socket *sock, struct sockaddr *uaddr,
835 int *uaddr_len, int peer)
836 {
837 struct full_sockaddr_ax25 *sax = (struct full_sockaddr_ax25 *)uaddr;
838 struct sock *sk = sock->sk;
839 struct nr_sock *nr = nr_sk(sk);
840
841 lock_sock(sk);
842 if (peer != 0) {
843 if (sk->sk_state != TCP_ESTABLISHED) {
844 release_sock(sk);
845 return -ENOTCONN;
846 }
847 sax->fsa_ax25.sax25_family = AF_NETROM;
848 sax->fsa_ax25.sax25_ndigis = 1;
849 sax->fsa_ax25.sax25_call = nr->user_addr;
850 memset(sax->fsa_digipeater, 0, sizeof(sax->fsa_digipeater));
851 sax->fsa_digipeater[0] = nr->dest_addr;
852 *uaddr_len = sizeof(struct full_sockaddr_ax25);
853 } else {
854 sax->fsa_ax25.sax25_family = AF_NETROM;
855 sax->fsa_ax25.sax25_ndigis = 0;
856 sax->fsa_ax25.sax25_call = nr->source_addr;
857 *uaddr_len = sizeof(struct sockaddr_ax25);
858 }
859 release_sock(sk);
860
861 return 0;
862 }
863
864 int nr_rx_frame(struct sk_buff *skb, struct net_device *dev)
865 {
866 struct sock *sk;
867 struct sock *make;
868 struct nr_sock *nr_make;
869 ax25_address *src, *dest, *user;
870 unsigned short circuit_index, circuit_id;
871 unsigned short peer_circuit_index, peer_circuit_id;
872 unsigned short frametype, flags, window, timeout;
873 int ret;
874
875 skb->sk = NULL; /* Initially we don't know who it's for */
876
877 /*
878 * skb->data points to the netrom frame start
879 */
880
881 src = (ax25_address *)(skb->data + 0);
882 dest = (ax25_address *)(skb->data + 7);
883
884 circuit_index = skb->data[15];
885 circuit_id = skb->data[16];
886 peer_circuit_index = skb->data[17];
887 peer_circuit_id = skb->data[18];
888 frametype = skb->data[19] & 0x0F;
889 flags = skb->data[19] & 0xF0;
890
891 /*
892 * Check for an incoming IP over NET/ROM frame.
893 */
894 if (frametype == NR_PROTOEXT &&
895 circuit_index == NR_PROTO_IP && circuit_id == NR_PROTO_IP) {
896 skb_pull(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN);
897 skb_reset_transport_header(skb);
898
899 return nr_rx_ip(skb, dev);
900 }
901
902 /*
903 * Find an existing socket connection, based on circuit ID, if it's
904 * a Connect Request base it on their circuit ID.
905 *
906 * Circuit ID 0/0 is not valid but it could still be a "reset" for a
907 * circuit that no longer exists at the other end ...
908 */
909
910 sk = NULL;
911
912 if (circuit_index == 0 && circuit_id == 0) {
913 if (frametype == NR_CONNACK && flags == NR_CHOKE_FLAG)
914 sk = nr_find_peer(peer_circuit_index, peer_circuit_id, src);
915 } else {
916 if (frametype == NR_CONNREQ)
917 sk = nr_find_peer(circuit_index, circuit_id, src);
918 else
919 sk = nr_find_socket(circuit_index, circuit_id);
920 }
921
922 if (sk != NULL) {
923 skb_reset_transport_header(skb);
924
925 if (frametype == NR_CONNACK && skb->len == 22)
926 nr_sk(sk)->bpqext = 1;
927 else
928 nr_sk(sk)->bpqext = 0;
929
930 ret = nr_process_rx_frame(sk, skb);
931 bh_unlock_sock(sk);
932 return ret;
933 }
934
935 /*
936 * Now it should be a CONNREQ.
937 */
938 if (frametype != NR_CONNREQ) {
939 /*
940 * Here it would be nice to be able to send a reset but
941 * NET/ROM doesn't have one. We've tried to extend the protocol
942 * by sending NR_CONNACK | NR_CHOKE_FLAGS replies but that
943 * apparently kills BPQ boxes... :-(
944 * So now we try to follow the established behaviour of
945 * G8PZT's Xrouter which is sending packets with command type 7
946 * as an extension of the protocol.
947 */
948 if (sysctl_netrom_reset_circuit &&
949 (frametype != NR_RESET || flags != 0))
950 nr_transmit_reset(skb, 1);
951
952 return 0;
953 }
954
955 sk = nr_find_listener(dest);
956
957 user = (ax25_address *)(skb->data + 21);
958
959 if (sk == NULL || sk_acceptq_is_full(sk) ||
960 (make = nr_make_new(sk)) == NULL) {
961 nr_transmit_refusal(skb, 0);
962 if (sk)
963 bh_unlock_sock(sk);
964 return 0;
965 }
966
967 window = skb->data[20];
968
969 skb->sk = make;
970 make->sk_state = TCP_ESTABLISHED;
971
972 /* Fill in his circuit details */
973 nr_make = nr_sk(make);
974 nr_make->source_addr = *dest;
975 nr_make->dest_addr = *src;
976 nr_make->user_addr = *user;
977
978 nr_make->your_index = circuit_index;
979 nr_make->your_id = circuit_id;
980
981 bh_unlock_sock(sk);
982 circuit = nr_find_next_circuit();
983 bh_lock_sock(sk);
984
985 nr_make->my_index = circuit / 256;
986 nr_make->my_id = circuit % 256;
987
988 circuit++;
989
990 /* Window negotiation */
991 if (window < nr_make->window)
992 nr_make->window = window;
993
994 /* L4 timeout negotiation */
995 if (skb->len == 37) {
996 timeout = skb->data[36] * 256 + skb->data[35];
997 if (timeout * HZ < nr_make->t1)
998 nr_make->t1 = timeout * HZ;
999 nr_make->bpqext = 1;
1000 } else {
1001 nr_make->bpqext = 0;
1002 }
1003
1004 nr_write_internal(make, NR_CONNACK);
1005
1006 nr_make->condition = 0x00;
1007 nr_make->vs = 0;
1008 nr_make->va = 0;
1009 nr_make->vr = 0;
1010 nr_make->vl = 0;
1011 nr_make->state = NR_STATE_3;
1012 sk_acceptq_added(sk);
1013 skb_queue_head(&sk->sk_receive_queue, skb);
1014
1015 if (!sock_flag(sk, SOCK_DEAD))
1016 sk->sk_data_ready(sk, skb->len);
1017
1018 bh_unlock_sock(sk);
1019
1020 nr_insert_socket(make);
1021
1022 nr_start_heartbeat(make);
1023 nr_start_idletimer(make);
1024
1025 return 1;
1026 }
1027
1028 static int nr_sendmsg(struct kiocb *iocb, struct socket *sock,
1029 struct msghdr *msg, size_t len)
1030 {
1031 struct sock *sk = sock->sk;
1032 struct nr_sock *nr = nr_sk(sk);
1033 struct sockaddr_ax25 *usax = (struct sockaddr_ax25 *)msg->msg_name;
1034 int err;
1035 struct sockaddr_ax25 sax;
1036 struct sk_buff *skb;
1037 unsigned char *asmptr;
1038 int size;
1039
1040 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT))
1041 return -EINVAL;
1042
1043 lock_sock(sk);
1044 if (sock_flag(sk, SOCK_ZAPPED)) {
1045 err = -EADDRNOTAVAIL;
1046 goto out;
1047 }
1048
1049 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1050 send_sig(SIGPIPE, current, 0);
1051 err = -EPIPE;
1052 goto out;
1053 }
1054
1055 if (nr->device == NULL) {
1056 err = -ENETUNREACH;
1057 goto out;
1058 }
1059
1060 if (usax) {
1061 if (msg->msg_namelen < sizeof(sax)) {
1062 err = -EINVAL;
1063 goto out;
1064 }
1065 sax = *usax;
1066 if (ax25cmp(&nr->dest_addr, &sax.sax25_call) != 0) {
1067 err = -EISCONN;
1068 goto out;
1069 }
1070 if (sax.sax25_family != AF_NETROM) {
1071 err = -EINVAL;
1072 goto out;
1073 }
1074 } else {
1075 if (sk->sk_state != TCP_ESTABLISHED) {
1076 err = -ENOTCONN;
1077 goto out;
1078 }
1079 sax.sax25_family = AF_NETROM;
1080 sax.sax25_call = nr->dest_addr;
1081 }
1082
1083 /* Build a packet - the conventional user limit is 236 bytes. We can
1084 do ludicrously large NetROM frames but must not overflow */
1085 if (len > 65536) {
1086 err = -EMSGSIZE;
1087 goto out;
1088 }
1089
1090 size = len + NR_NETWORK_LEN + NR_TRANSPORT_LEN;
1091
1092 if ((skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL)
1093 goto out;
1094
1095 skb_reserve(skb, size - len);
1096 skb_reset_transport_header(skb);
1097
1098 /*
1099 * Push down the NET/ROM header
1100 */
1101
1102 asmptr = skb_push(skb, NR_TRANSPORT_LEN);
1103
1104 /* Build a NET/ROM Transport header */
1105
1106 *asmptr++ = nr->your_index;
1107 *asmptr++ = nr->your_id;
1108 *asmptr++ = 0; /* To be filled in later */
1109 *asmptr++ = 0; /* Ditto */
1110 *asmptr++ = NR_INFO;
1111
1112 /*
1113 * Put the data on the end
1114 */
1115 skb_put(skb, len);
1116
1117 /* User data follows immediately after the NET/ROM transport header */
1118 if (memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len)) {
1119 kfree_skb(skb);
1120 err = -EFAULT;
1121 goto out;
1122 }
1123
1124 if (sk->sk_state != TCP_ESTABLISHED) {
1125 kfree_skb(skb);
1126 err = -ENOTCONN;
1127 goto out;
1128 }
1129
1130 nr_output(sk, skb); /* Shove it onto the queue */
1131
1132 err = len;
1133 out:
1134 release_sock(sk);
1135 return err;
1136 }
1137
1138 static int nr_recvmsg(struct kiocb *iocb, struct socket *sock,
1139 struct msghdr *msg, size_t size, int flags)
1140 {
1141 struct sock *sk = sock->sk;
1142 struct sockaddr_ax25 *sax = (struct sockaddr_ax25 *)msg->msg_name;
1143 size_t copied;
1144 struct sk_buff *skb;
1145 int er;
1146
1147 /*
1148 * This works for seqpacket too. The receiver has ordered the queue for
1149 * us! We do one quick check first though
1150 */
1151
1152 lock_sock(sk);
1153 if (sk->sk_state != TCP_ESTABLISHED) {
1154 release_sock(sk);
1155 return -ENOTCONN;
1156 }
1157
1158 /* Now we can treat all alike */
1159 if ((skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, flags & MSG_DONTWAIT, &er)) == NULL) {
1160 release_sock(sk);
1161 return er;
1162 }
1163
1164 skb_reset_transport_header(skb);
1165 copied = skb->len;
1166
1167 if (copied > size) {
1168 copied = size;
1169 msg->msg_flags |= MSG_TRUNC;
1170 }
1171
1172 er = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1173 if (er < 0) {
1174 skb_free_datagram(sk, skb);
1175 release_sock(sk);
1176 return er;
1177 }
1178
1179 if (sax != NULL) {
1180 sax->sax25_family = AF_NETROM;
1181 skb_copy_from_linear_data_offset(skb, 7, sax->sax25_call.ax25_call,
1182 AX25_ADDR_LEN);
1183 }
1184
1185 msg->msg_namelen = sizeof(*sax);
1186
1187 skb_free_datagram(sk, skb);
1188
1189 release_sock(sk);
1190 return copied;
1191 }
1192
1193
1194 static int nr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1195 {
1196 struct sock *sk = sock->sk;
1197 void __user *argp = (void __user *)arg;
1198 int ret;
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 SIOCGSTAMP:
1225 lock_sock(sk);
1226 ret = sock_get_timestamp(sk, argp);
1227 release_sock(sk);
1228 return ret;
1229
1230 case SIOCGSTAMPNS:
1231 lock_sock(sk);
1232 ret = sock_get_timestampns(sk, argp);
1233 release_sock(sk);
1234 return ret;
1235
1236 case SIOCGIFADDR:
1237 case SIOCSIFADDR:
1238 case SIOCGIFDSTADDR:
1239 case SIOCSIFDSTADDR:
1240 case SIOCGIFBRDADDR:
1241 case SIOCSIFBRDADDR:
1242 case SIOCGIFNETMASK:
1243 case SIOCSIFNETMASK:
1244 case SIOCGIFMETRIC:
1245 case SIOCSIFMETRIC:
1246 return -EINVAL;
1247
1248 case SIOCADDRT:
1249 case SIOCDELRT:
1250 case SIOCNRDECOBS:
1251 if (!capable(CAP_NET_ADMIN))
1252 return -EPERM;
1253 return nr_rt_ioctl(cmd, argp);
1254
1255 default:
1256 return -ENOIOCTLCMD;
1257 }
1258
1259 return 0;
1260 }
1261
1262 #ifdef CONFIG_PROC_FS
1263
1264 static void *nr_info_start(struct seq_file *seq, loff_t *pos)
1265 {
1266 spin_lock_bh(&nr_list_lock);
1267 return seq_hlist_start_head(&nr_list, *pos);
1268 }
1269
1270 static void *nr_info_next(struct seq_file *seq, void *v, loff_t *pos)
1271 {
1272 return seq_hlist_next(v, &nr_list, pos);
1273 }
1274
1275 static void nr_info_stop(struct seq_file *seq, void *v)
1276 {
1277 spin_unlock_bh(&nr_list_lock);
1278 }
1279
1280 static int nr_info_show(struct seq_file *seq, void *v)
1281 {
1282 struct sock *s = sk_entry(v);
1283 struct net_device *dev;
1284 struct nr_sock *nr;
1285 const char *devname;
1286 char buf[11];
1287
1288 if (v == SEQ_START_TOKEN)
1289 seq_puts(seq,
1290 "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");
1291
1292 else {
1293
1294 bh_lock_sock(s);
1295 nr = nr_sk(s);
1296
1297 if ((dev = nr->device) == NULL)
1298 devname = "???";
1299 else
1300 devname = dev->name;
1301
1302 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->user_addr));
1303 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->dest_addr));
1304 seq_printf(seq,
1305 "%-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",
1306 ax2asc(buf, &nr->source_addr),
1307 devname,
1308 nr->my_index,
1309 nr->my_id,
1310 nr->your_index,
1311 nr->your_id,
1312 nr->state,
1313 nr->vs,
1314 nr->vr,
1315 nr->va,
1316 ax25_display_timer(&nr->t1timer) / HZ,
1317 nr->t1 / HZ,
1318 ax25_display_timer(&nr->t2timer) / HZ,
1319 nr->t2 / HZ,
1320 ax25_display_timer(&nr->t4timer) / HZ,
1321 nr->t4 / HZ,
1322 ax25_display_timer(&nr->idletimer) / (60 * HZ),
1323 nr->idle / (60 * HZ),
1324 nr->n2count,
1325 nr->n2,
1326 nr->window,
1327 sk_wmem_alloc_get(s),
1328 sk_rmem_alloc_get(s),
1329 s->sk_socket ? SOCK_INODE(s->sk_socket)->i_ino : 0L);
1330
1331 bh_unlock_sock(s);
1332 }
1333 return 0;
1334 }
1335
1336 static const struct seq_operations nr_info_seqops = {
1337 .start = nr_info_start,
1338 .next = nr_info_next,
1339 .stop = nr_info_stop,
1340 .show = nr_info_show,
1341 };
1342
1343 static int nr_info_open(struct inode *inode, struct file *file)
1344 {
1345 return seq_open(file, &nr_info_seqops);
1346 }
1347
1348 static const struct file_operations nr_info_fops = {
1349 .owner = THIS_MODULE,
1350 .open = nr_info_open,
1351 .read = seq_read,
1352 .llseek = seq_lseek,
1353 .release = seq_release,
1354 };
1355 #endif /* CONFIG_PROC_FS */
1356
1357 static const struct net_proto_family nr_family_ops = {
1358 .family = PF_NETROM,
1359 .create = nr_create,
1360 .owner = THIS_MODULE,
1361 };
1362
1363 static const struct proto_ops nr_proto_ops = {
1364 .family = PF_NETROM,
1365 .owner = THIS_MODULE,
1366 .release = nr_release,
1367 .bind = nr_bind,
1368 .connect = nr_connect,
1369 .socketpair = sock_no_socketpair,
1370 .accept = nr_accept,
1371 .getname = nr_getname,
1372 .poll = datagram_poll,
1373 .ioctl = nr_ioctl,
1374 .listen = nr_listen,
1375 .shutdown = sock_no_shutdown,
1376 .setsockopt = nr_setsockopt,
1377 .getsockopt = nr_getsockopt,
1378 .sendmsg = nr_sendmsg,
1379 .recvmsg = nr_recvmsg,
1380 .mmap = sock_no_mmap,
1381 .sendpage = sock_no_sendpage,
1382 };
1383
1384 static struct notifier_block nr_dev_notifier = {
1385 .notifier_call = nr_device_event,
1386 };
1387
1388 static struct net_device **dev_nr;
1389
1390 static struct ax25_protocol nr_pid = {
1391 .pid = AX25_P_NETROM,
1392 .func = nr_route_frame
1393 };
1394
1395 static struct ax25_linkfail nr_linkfail_notifier = {
1396 .func = nr_link_failed,
1397 };
1398
1399 static int __init nr_proto_init(void)
1400 {
1401 int i;
1402 int rc = proto_register(&nr_proto, 0);
1403
1404 if (rc != 0)
1405 goto out;
1406
1407 if (nr_ndevs > 0x7fffffff/sizeof(struct net_device *)) {
1408 printk(KERN_ERR "NET/ROM: nr_proto_init - nr_ndevs parameter to large\n");
1409 return -1;
1410 }
1411
1412 dev_nr = kzalloc(nr_ndevs * sizeof(struct net_device *), GFP_KERNEL);
1413 if (dev_nr == NULL) {
1414 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device array\n");
1415 return -1;
1416 }
1417
1418 for (i = 0; i < nr_ndevs; i++) {
1419 char name[IFNAMSIZ];
1420 struct net_device *dev;
1421
1422 sprintf(name, "nr%d", i);
1423 dev = alloc_netdev(0, name, nr_setup);
1424 if (!dev) {
1425 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device structure\n");
1426 goto fail;
1427 }
1428
1429 dev->base_addr = i;
1430 if (register_netdev(dev)) {
1431 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register network device\n");
1432 free_netdev(dev);
1433 goto fail;
1434 }
1435 nr_set_lockdep_key(dev);
1436 dev_nr[i] = dev;
1437 }
1438
1439 if (sock_register(&nr_family_ops)) {
1440 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register socket family\n");
1441 goto fail;
1442 }
1443
1444 register_netdevice_notifier(&nr_dev_notifier);
1445
1446 ax25_register_pid(&nr_pid);
1447 ax25_linkfail_register(&nr_linkfail_notifier);
1448
1449 #ifdef CONFIG_SYSCTL
1450 nr_register_sysctl();
1451 #endif
1452
1453 nr_loopback_init();
1454
1455 proc_net_fops_create(&init_net, "nr", S_IRUGO, &nr_info_fops);
1456 proc_net_fops_create(&init_net, "nr_neigh", S_IRUGO, &nr_neigh_fops);
1457 proc_net_fops_create(&init_net, "nr_nodes", S_IRUGO, &nr_nodes_fops);
1458 out:
1459 return rc;
1460 fail:
1461 while (--i >= 0) {
1462 unregister_netdev(dev_nr[i]);
1463 free_netdev(dev_nr[i]);
1464 }
1465 kfree(dev_nr);
1466 proto_unregister(&nr_proto);
1467 rc = -1;
1468 goto out;
1469 }
1470
1471 module_init(nr_proto_init);
1472
1473 module_param(nr_ndevs, int, 0);
1474 MODULE_PARM_DESC(nr_ndevs, "number of NET/ROM devices");
1475
1476 MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>");
1477 MODULE_DESCRIPTION("The amateur radio NET/ROM network and transport layer protocol");
1478 MODULE_LICENSE("GPL");
1479 MODULE_ALIAS_NETPROTO(PF_NETROM);
1480
1481 static void __exit nr_exit(void)
1482 {
1483 int i;
1484
1485 proc_net_remove(&init_net, "nr");
1486 proc_net_remove(&init_net, "nr_neigh");
1487 proc_net_remove(&init_net, "nr_nodes");
1488 nr_loopback_clear();
1489
1490 nr_rt_free();
1491
1492 #ifdef CONFIG_SYSCTL
1493 nr_unregister_sysctl();
1494 #endif
1495
1496 ax25_linkfail_release(&nr_linkfail_notifier);
1497 ax25_protocol_release(AX25_P_NETROM);
1498
1499 unregister_netdevice_notifier(&nr_dev_notifier);
1500
1501 sock_unregister(PF_NETROM);
1502
1503 for (i = 0; i < nr_ndevs; i++) {
1504 struct net_device *dev = dev_nr[i];
1505 if (dev) {
1506 unregister_netdev(dev);
1507 free_netdev(dev);
1508 }
1509 }
1510
1511 kfree(dev_nr);
1512 proto_unregister(&nr_proto);
1513 }
1514 module_exit(nr_exit);
Linux 2.6 libata-dev (mirror)