xref: /openbmc/linux/net/netrom/af_netrom.c (revision e868d61272caa648214046a096e5a6bfc068dc8c)
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/sock.h>
31 #include <asm/uaccess.h>
32 #include <asm/system.h>
33 #include <linux/fcntl.h>
34 #include <linux/termios.h>	/* For TIOCINQ/OUTQ */
35 #include <linux/mm.h>
36 #include <linux/interrupt.h>
37 #include <linux/notifier.h>
38 #include <net/netrom.h>
39 #include <linux/proc_fs.h>
40 #include <linux/seq_file.h>
41 #include <net/ip.h>
42 #include <net/tcp_states.h>
43 #include <net/arp.h>
44 #include <linux/init.h>
45 
46 static int nr_ndevs = 4;
47 
48 int sysctl_netrom_default_path_quality            = NR_DEFAULT_QUAL;
49 int sysctl_netrom_obsolescence_count_initialiser  = NR_DEFAULT_OBS;
50 int sysctl_netrom_network_ttl_initialiser         = NR_DEFAULT_TTL;
51 int sysctl_netrom_transport_timeout               = NR_DEFAULT_T1;
52 int sysctl_netrom_transport_maximum_tries         = NR_DEFAULT_N2;
53 int sysctl_netrom_transport_acknowledge_delay     = NR_DEFAULT_T2;
54 int sysctl_netrom_transport_busy_delay            = NR_DEFAULT_T4;
55 int sysctl_netrom_transport_requested_window_size = NR_DEFAULT_WINDOW;
56 int sysctl_netrom_transport_no_activity_timeout   = NR_DEFAULT_IDLE;
57 int sysctl_netrom_routing_control                 = NR_DEFAULT_ROUTING;
58 int sysctl_netrom_link_fails_count                = NR_DEFAULT_FAILS;
59 int sysctl_netrom_reset_circuit                   = NR_DEFAULT_RESET;
60 
61 static unsigned short circuit = 0x101;
62 
63 static HLIST_HEAD(nr_list);
64 static DEFINE_SPINLOCK(nr_list_lock);
65 
66 static const struct proto_ops nr_proto_ops;
67 
68 /*
69  * NETROM network devices are virtual network devices encapsulating NETROM
70  * frames into AX.25 which will be sent through an AX.25 device, so form a
71  * special "super class" of normal net devices; split their locks off into a
72  * separate class since they always nest.
73  */
74 static struct lock_class_key nr_netdev_xmit_lock_key;
75 
76 /*
77  *	Socket removal during an interrupt is now safe.
78  */
79 static void nr_remove_socket(struct sock *sk)
80 {
81 	spin_lock_bh(&nr_list_lock);
82 	sk_del_node_init(sk);
83 	spin_unlock_bh(&nr_list_lock);
84 }
85 
86 /*
87  *	Kill all bound sockets on a dropped device.
88  */
89 static void nr_kill_by_device(struct net_device *dev)
90 {
91 	struct sock *s;
92 	struct hlist_node *node;
93 
94 	spin_lock_bh(&nr_list_lock);
95 	sk_for_each(s, node, &nr_list)
96 		if (nr_sk(s)->device == dev)
97 			nr_disconnect(s, ENETUNREACH);
98 	spin_unlock_bh(&nr_list_lock);
99 }
100 
101 /*
102  *	Handle device status changes.
103  */
104 static int nr_device_event(struct notifier_block *this, unsigned long event, void *ptr)
105 {
106 	struct net_device *dev = (struct net_device *)ptr;
107 
108 	if (event != NETDEV_DOWN)
109 		return NOTIFY_DONE;
110 
111 	nr_kill_by_device(dev);
112 	nr_rt_device_down(dev);
113 
114 	return NOTIFY_DONE;
115 }
116 
117 /*
118  *	Add a socket to the bound sockets list.
119  */
120 static void nr_insert_socket(struct sock *sk)
121 {
122 	spin_lock_bh(&nr_list_lock);
123 	sk_add_node(sk, &nr_list);
124 	spin_unlock_bh(&nr_list_lock);
125 }
126 
127 /*
128  *	Find a socket that wants to accept the Connect Request we just
129  *	received.
130  */
131 static struct sock *nr_find_listener(ax25_address *addr)
132 {
133 	struct sock *s;
134 	struct hlist_node *node;
135 
136 	spin_lock_bh(&nr_list_lock);
137 	sk_for_each(s, node, &nr_list)
138 		if (!ax25cmp(&nr_sk(s)->source_addr, addr) &&
139 		    s->sk_state == TCP_LISTEN) {
140 			bh_lock_sock(s);
141 			goto found;
142 		}
143 	s = NULL;
144 found:
145 	spin_unlock_bh(&nr_list_lock);
146 	return s;
147 }
148 
149 /*
150  *	Find a connected NET/ROM socket given my circuit IDs.
151  */
152 static struct sock *nr_find_socket(unsigned char index, unsigned char id)
153 {
154 	struct sock *s;
155 	struct hlist_node *node;
156 
157 	spin_lock_bh(&nr_list_lock);
158 	sk_for_each(s, node, &nr_list) {
159 		struct nr_sock *nr = nr_sk(s);
160 
161 		if (nr->my_index == index && nr->my_id == id) {
162 			bh_lock_sock(s);
163 			goto found;
164 		}
165 	}
166 	s = NULL;
167 found:
168 	spin_unlock_bh(&nr_list_lock);
169 	return s;
170 }
171 
172 /*
173  *	Find a connected NET/ROM socket given their circuit IDs.
174  */
175 static struct sock *nr_find_peer(unsigned char index, unsigned char id,
176 	ax25_address *dest)
177 {
178 	struct sock *s;
179 	struct hlist_node *node;
180 
181 	spin_lock_bh(&nr_list_lock);
182 	sk_for_each(s, node, &nr_list) {
183 		struct nr_sock *nr = nr_sk(s);
184 
185 		if (nr->your_index == index && nr->your_id == id &&
186 		    !ax25cmp(&nr->dest_addr, dest)) {
187 			bh_lock_sock(s);
188 			goto found;
189 		}
190 	}
191 	s = NULL;
192 found:
193 	spin_unlock_bh(&nr_list_lock);
194 	return s;
195 }
196 
197 /*
198  *	Find next free circuit ID.
199  */
200 static unsigned short nr_find_next_circuit(void)
201 {
202 	unsigned short id = circuit;
203 	unsigned char i, j;
204 	struct sock *sk;
205 
206 	for (;;) {
207 		i = id / 256;
208 		j = id % 256;
209 
210 		if (i != 0 && j != 0) {
211 			if ((sk=nr_find_socket(i, j)) == NULL)
212 				break;
213 			bh_unlock_sock(sk);
214 		}
215 
216 		id++;
217 	}
218 
219 	return id;
220 }
221 
222 /*
223  *	Deferred destroy.
224  */
225 void nr_destroy_socket(struct sock *);
226 
227 /*
228  *	Handler for deferred kills.
229  */
230 static void nr_destroy_timer(unsigned long data)
231 {
232 	struct sock *sk=(struct sock *)data;
233 	bh_lock_sock(sk);
234 	sock_hold(sk);
235 	nr_destroy_socket(sk);
236 	bh_unlock_sock(sk);
237 	sock_put(sk);
238 }
239 
240 /*
241  *	This is called from user mode and the timers. Thus it protects itself
242  *	against interrupt users but doesn't worry about being called during
243  *	work. Once it is removed from the queue no interrupt or bottom half
244  *	will touch it and we are (fairly 8-) ) safe.
245  */
246 void nr_destroy_socket(struct sock *sk)
247 {
248 	struct sk_buff *skb;
249 
250 	nr_remove_socket(sk);
251 
252 	nr_stop_heartbeat(sk);
253 	nr_stop_t1timer(sk);
254 	nr_stop_t2timer(sk);
255 	nr_stop_t4timer(sk);
256 	nr_stop_idletimer(sk);
257 
258 	nr_clear_queues(sk);		/* Flush the queues */
259 
260 	while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
261 		if (skb->sk != sk) { /* A pending connection */
262 			/* Queue the unaccepted socket for death */
263 			sock_set_flag(skb->sk, SOCK_DEAD);
264 			nr_start_heartbeat(skb->sk);
265 			nr_sk(skb->sk)->state = NR_STATE_0;
266 		}
267 
268 		kfree_skb(skb);
269 	}
270 
271 	if (atomic_read(&sk->sk_wmem_alloc) ||
272 	    atomic_read(&sk->sk_rmem_alloc)) {
273 		/* Defer: outstanding buffers */
274 		sk->sk_timer.function = nr_destroy_timer;
275 		sk->sk_timer.expires  = jiffies + 2 * HZ;
276 		add_timer(&sk->sk_timer);
277 	} else
278 		sock_put(sk);
279 }
280 
281 /*
282  *	Handling for system calls applied via the various interfaces to a
283  *	NET/ROM socket object.
284  */
285 
286 static int nr_setsockopt(struct socket *sock, int level, int optname,
287 	char __user *optval, int optlen)
288 {
289 	struct sock *sk = sock->sk;
290 	struct nr_sock *nr = nr_sk(sk);
291 	int opt;
292 
293 	if (level != SOL_NETROM)
294 		return -ENOPROTOOPT;
295 
296 	if (optlen < sizeof(int))
297 		return -EINVAL;
298 
299 	if (get_user(opt, (int __user *)optval))
300 		return -EFAULT;
301 
302 	switch (optname) {
303 	case NETROM_T1:
304 		if (opt < 1)
305 			return -EINVAL;
306 		nr->t1 = opt * HZ;
307 		return 0;
308 
309 	case NETROM_T2:
310 		if (opt < 1)
311 			return -EINVAL;
312 		nr->t2 = opt * HZ;
313 		return 0;
314 
315 	case NETROM_N2:
316 		if (opt < 1 || opt > 31)
317 			return -EINVAL;
318 		nr->n2 = opt;
319 		return 0;
320 
321 	case NETROM_T4:
322 		if (opt < 1)
323 			return -EINVAL;
324 		nr->t4 = opt * HZ;
325 		return 0;
326 
327 	case NETROM_IDLE:
328 		if (opt < 0)
329 			return -EINVAL;
330 		nr->idle = opt * 60 * HZ;
331 		return 0;
332 
333 	default:
334 		return -ENOPROTOOPT;
335 	}
336 }
337 
338 static int nr_getsockopt(struct socket *sock, int level, int optname,
339 	char __user *optval, int __user *optlen)
340 {
341 	struct sock *sk = sock->sk;
342 	struct nr_sock *nr = nr_sk(sk);
343 	int val = 0;
344 	int len;
345 
346 	if (level != SOL_NETROM)
347 		return -ENOPROTOOPT;
348 
349 	if (get_user(len, optlen))
350 		return -EFAULT;
351 
352 	if (len < 0)
353 		return -EINVAL;
354 
355 	switch (optname) {
356 	case NETROM_T1:
357 		val = nr->t1 / HZ;
358 		break;
359 
360 	case NETROM_T2:
361 		val = nr->t2 / HZ;
362 		break;
363 
364 	case NETROM_N2:
365 		val = nr->n2;
366 		break;
367 
368 	case NETROM_T4:
369 		val = nr->t4 / HZ;
370 		break;
371 
372 	case NETROM_IDLE:
373 		val = nr->idle / (60 * HZ);
374 		break;
375 
376 	default:
377 		return -ENOPROTOOPT;
378 	}
379 
380 	len = min_t(unsigned int, len, sizeof(int));
381 
382 	if (put_user(len, optlen))
383 		return -EFAULT;
384 
385 	return copy_to_user(optval, &val, len) ? -EFAULT : 0;
386 }
387 
388 static int nr_listen(struct socket *sock, int backlog)
389 {
390 	struct sock *sk = sock->sk;
391 
392 	lock_sock(sk);
393 	if (sk->sk_state != TCP_LISTEN) {
394 		memset(&nr_sk(sk)->user_addr, 0, AX25_ADDR_LEN);
395 		sk->sk_max_ack_backlog = backlog;
396 		sk->sk_state           = TCP_LISTEN;
397 		release_sock(sk);
398 		return 0;
399 	}
400 	release_sock(sk);
401 
402 	return -EOPNOTSUPP;
403 }
404 
405 static struct proto nr_proto = {
406 	.name	  = "NETROM",
407 	.owner	  = THIS_MODULE,
408 	.obj_size = sizeof(struct nr_sock),
409 };
410 
411 static int nr_create(struct socket *sock, int protocol)
412 {
413 	struct sock *sk;
414 	struct nr_sock *nr;
415 
416 	if (sock->type != SOCK_SEQPACKET || protocol != 0)
417 		return -ESOCKTNOSUPPORT;
418 
419 	if ((sk = sk_alloc(PF_NETROM, GFP_ATOMIC, &nr_proto, 1)) == NULL)
420 		return -ENOMEM;
421 
422 	nr = nr_sk(sk);
423 
424 	sock_init_data(sock, sk);
425 
426 	sock->ops    = &nr_proto_ops;
427 	sk->sk_protocol = protocol;
428 
429 	skb_queue_head_init(&nr->ack_queue);
430 	skb_queue_head_init(&nr->reseq_queue);
431 	skb_queue_head_init(&nr->frag_queue);
432 
433 	nr_init_timers(sk);
434 
435 	nr->t1     =
436 		msecs_to_jiffies(sysctl_netrom_transport_timeout);
437 	nr->t2     =
438 		msecs_to_jiffies(sysctl_netrom_transport_acknowledge_delay);
439 	nr->n2     =
440 		msecs_to_jiffies(sysctl_netrom_transport_maximum_tries);
441 	nr->t4     =
442 		msecs_to_jiffies(sysctl_netrom_transport_busy_delay);
443 	nr->idle   =
444 		msecs_to_jiffies(sysctl_netrom_transport_no_activity_timeout);
445 	nr->window = sysctl_netrom_transport_requested_window_size;
446 
447 	nr->bpqext = 1;
448 	nr->state  = NR_STATE_0;
449 
450 	return 0;
451 }
452 
453 static struct sock *nr_make_new(struct sock *osk)
454 {
455 	struct sock *sk;
456 	struct nr_sock *nr, *onr;
457 
458 	if (osk->sk_type != SOCK_SEQPACKET)
459 		return NULL;
460 
461 	if ((sk = sk_alloc(PF_NETROM, GFP_ATOMIC, osk->sk_prot, 1)) == NULL)
462 		return NULL;
463 
464 	nr = nr_sk(sk);
465 
466 	sock_init_data(NULL, sk);
467 
468 	sk->sk_type     = osk->sk_type;
469 	sk->sk_socket   = osk->sk_socket;
470 	sk->sk_priority = osk->sk_priority;
471 	sk->sk_protocol = osk->sk_protocol;
472 	sk->sk_rcvbuf   = osk->sk_rcvbuf;
473 	sk->sk_sndbuf   = osk->sk_sndbuf;
474 	sk->sk_state    = TCP_ESTABLISHED;
475 	sk->sk_sleep    = osk->sk_sleep;
476 	sock_copy_flags(sk, osk);
477 
478 	skb_queue_head_init(&nr->ack_queue);
479 	skb_queue_head_init(&nr->reseq_queue);
480 	skb_queue_head_init(&nr->frag_queue);
481 
482 	nr_init_timers(sk);
483 
484 	onr = nr_sk(osk);
485 
486 	nr->t1      = onr->t1;
487 	nr->t2      = onr->t2;
488 	nr->n2      = onr->n2;
489 	nr->t4      = onr->t4;
490 	nr->idle    = onr->idle;
491 	nr->window  = onr->window;
492 
493 	nr->device  = onr->device;
494 	nr->bpqext  = onr->bpqext;
495 
496 	return sk;
497 }
498 
499 static int nr_release(struct socket *sock)
500 {
501 	struct sock *sk = sock->sk;
502 	struct nr_sock *nr;
503 
504 	if (sk == NULL) return 0;
505 
506 	sock_hold(sk);
507 	lock_sock(sk);
508 	nr = nr_sk(sk);
509 
510 	switch (nr->state) {
511 	case NR_STATE_0:
512 	case NR_STATE_1:
513 	case NR_STATE_2:
514 		nr_disconnect(sk, 0);
515 		nr_destroy_socket(sk);
516 		break;
517 
518 	case NR_STATE_3:
519 		nr_clear_queues(sk);
520 		nr->n2count = 0;
521 		nr_write_internal(sk, NR_DISCREQ);
522 		nr_start_t1timer(sk);
523 		nr_stop_t2timer(sk);
524 		nr_stop_t4timer(sk);
525 		nr_stop_idletimer(sk);
526 		nr->state    = NR_STATE_2;
527 		sk->sk_state    = TCP_CLOSE;
528 		sk->sk_shutdown |= SEND_SHUTDOWN;
529 		sk->sk_state_change(sk);
530 		sock_orphan(sk);
531 		sock_set_flag(sk, SOCK_DESTROY);
532 		sk->sk_socket   = NULL;
533 		break;
534 
535 	default:
536 		sk->sk_socket = NULL;
537 		break;
538 	}
539 
540 	sock->sk   = NULL;
541 	release_sock(sk);
542 	sock_put(sk);
543 
544 	return 0;
545 }
546 
547 static int nr_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
548 {
549 	struct sock *sk = sock->sk;
550 	struct nr_sock *nr = nr_sk(sk);
551 	struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr;
552 	struct net_device *dev;
553 	ax25_uid_assoc *user;
554 	ax25_address *source;
555 
556 	lock_sock(sk);
557 	if (!sock_flag(sk, SOCK_ZAPPED)) {
558 		release_sock(sk);
559 		return -EINVAL;
560 	}
561 	if (addr_len < sizeof(struct sockaddr_ax25) || addr_len > sizeof(struct full_sockaddr_ax25)) {
562 		release_sock(sk);
563 		return -EINVAL;
564 	}
565 	if (addr_len < (addr->fsa_ax25.sax25_ndigis * sizeof(ax25_address) + sizeof(struct sockaddr_ax25))) {
566 		release_sock(sk);
567 		return -EINVAL;
568 	}
569 	if (addr->fsa_ax25.sax25_family != AF_NETROM) {
570 		release_sock(sk);
571 		return -EINVAL;
572 	}
573 	if ((dev = nr_dev_get(&addr->fsa_ax25.sax25_call)) == NULL) {
574 		SOCK_DEBUG(sk, "NET/ROM: bind failed: invalid node callsign\n");
575 		release_sock(sk);
576 		return -EADDRNOTAVAIL;
577 	}
578 
579 	/*
580 	 * Only the super user can set an arbitrary user callsign.
581 	 */
582 	if (addr->fsa_ax25.sax25_ndigis == 1) {
583 		if (!capable(CAP_NET_BIND_SERVICE)) {
584 			dev_put(dev);
585 			release_sock(sk);
586 			return -EACCES;
587 		}
588 		nr->user_addr   = addr->fsa_digipeater[0];
589 		nr->source_addr = addr->fsa_ax25.sax25_call;
590 	} else {
591 		source = &addr->fsa_ax25.sax25_call;
592 
593 		user = ax25_findbyuid(current->euid);
594 		if (user) {
595 			nr->user_addr   = user->call;
596 			ax25_uid_put(user);
597 		} else {
598 			if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) {
599 				release_sock(sk);
600 				dev_put(dev);
601 				return -EPERM;
602 			}
603 			nr->user_addr   = *source;
604 		}
605 
606 		nr->source_addr = *source;
607 	}
608 
609 	nr->device = dev;
610 	nr_insert_socket(sk);
611 
612 	sock_reset_flag(sk, SOCK_ZAPPED);
613 	dev_put(dev);
614 	release_sock(sk);
615 	SOCK_DEBUG(sk, "NET/ROM: socket is bound\n");
616 	return 0;
617 }
618 
619 static int nr_connect(struct socket *sock, struct sockaddr *uaddr,
620 	int addr_len, int flags)
621 {
622 	struct sock *sk = sock->sk;
623 	struct nr_sock *nr = nr_sk(sk);
624 	struct sockaddr_ax25 *addr = (struct sockaddr_ax25 *)uaddr;
625 	ax25_address *source = NULL;
626 	ax25_uid_assoc *user;
627 	struct net_device *dev;
628 	int err = 0;
629 
630 	lock_sock(sk);
631 	if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
632 		sock->state = SS_CONNECTED;
633 		goto out_release;	/* Connect completed during a ERESTARTSYS event */
634 	}
635 
636 	if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
637 		sock->state = SS_UNCONNECTED;
638 		err = -ECONNREFUSED;
639 		goto out_release;
640 	}
641 
642 	if (sk->sk_state == TCP_ESTABLISHED) {
643 		err = -EISCONN;	/* No reconnect on a seqpacket socket */
644 		goto out_release;
645 	}
646 
647 	sk->sk_state   = TCP_CLOSE;
648 	sock->state = SS_UNCONNECTED;
649 
650 	if (addr_len != sizeof(struct sockaddr_ax25) && addr_len != sizeof(struct full_sockaddr_ax25)) {
651 		err = -EINVAL;
652 		goto out_release;
653 	}
654 	if (addr->sax25_family != AF_NETROM) {
655 		err = -EINVAL;
656 		goto out_release;
657 	}
658 	if (sock_flag(sk, SOCK_ZAPPED)) {	/* Must bind first - autobinding in this may or may not work */
659 		sock_reset_flag(sk, SOCK_ZAPPED);
660 
661 		if ((dev = nr_dev_first()) == NULL) {
662 			err = -ENETUNREACH;
663 			goto out_release;
664 		}
665 		source = (ax25_address *)dev->dev_addr;
666 
667 		user = ax25_findbyuid(current->euid);
668 		if (user) {
669 			nr->user_addr   = user->call;
670 			ax25_uid_put(user);
671 		} else {
672 			if (ax25_uid_policy && !capable(CAP_NET_ADMIN)) {
673 				dev_put(dev);
674 				err = -EPERM;
675 				goto out_release;
676 			}
677 			nr->user_addr   = *source;
678 		}
679 
680 		nr->source_addr = *source;
681 		nr->device      = dev;
682 
683 		dev_put(dev);
684 		nr_insert_socket(sk);		/* Finish the bind */
685 	}
686 
687 	nr->dest_addr = addr->sax25_call;
688 
689 	release_sock(sk);
690 	circuit = nr_find_next_circuit();
691 	lock_sock(sk);
692 
693 	nr->my_index = circuit / 256;
694 	nr->my_id    = circuit % 256;
695 
696 	circuit++;
697 
698 	/* Move to connecting socket, start sending Connect Requests */
699 	sock->state  = SS_CONNECTING;
700 	sk->sk_state = TCP_SYN_SENT;
701 
702 	nr_establish_data_link(sk);
703 
704 	nr->state = NR_STATE_1;
705 
706 	nr_start_heartbeat(sk);
707 
708 	/* Now the loop */
709 	if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) {
710 		err = -EINPROGRESS;
711 		goto out_release;
712 	}
713 
714 	/*
715 	 * A Connect Ack with Choke or timeout or failed routing will go to
716 	 * closed.
717 	 */
718 	if (sk->sk_state == TCP_SYN_SENT) {
719 		DEFINE_WAIT(wait);
720 
721 		for (;;) {
722 			prepare_to_wait(sk->sk_sleep, &wait,
723 			                TASK_INTERRUPTIBLE);
724 			if (sk->sk_state != TCP_SYN_SENT)
725 				break;
726 			if (!signal_pending(current)) {
727 				release_sock(sk);
728 				schedule();
729 				lock_sock(sk);
730 				continue;
731 			}
732 			err = -ERESTARTSYS;
733 			break;
734 		}
735 		finish_wait(sk->sk_sleep, &wait);
736 		if (err)
737 			goto out_release;
738 	}
739 
740 	if (sk->sk_state != TCP_ESTABLISHED) {
741 		sock->state = SS_UNCONNECTED;
742 		err = sock_error(sk);	/* Always set at this point */
743 		goto out_release;
744 	}
745 
746 	sock->state = SS_CONNECTED;
747 
748 out_release:
749 	release_sock(sk);
750 
751 	return err;
752 }
753 
754 static int nr_accept(struct socket *sock, struct socket *newsock, int flags)
755 {
756 	struct sk_buff *skb;
757 	struct sock *newsk;
758 	DEFINE_WAIT(wait);
759 	struct sock *sk;
760 	int err = 0;
761 
762 	if ((sk = sock->sk) == NULL)
763 		return -EINVAL;
764 
765 	lock_sock(sk);
766 	if (sk->sk_type != SOCK_SEQPACKET) {
767 		err = -EOPNOTSUPP;
768 		goto out_release;
769 	}
770 
771 	if (sk->sk_state != TCP_LISTEN) {
772 		err = -EINVAL;
773 		goto out_release;
774 	}
775 
776 	/*
777 	 *	The write queue this time is holding sockets ready to use
778 	 *	hooked into the SABM we saved
779 	 */
780 	for (;;) {
781 		prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
782 		skb = skb_dequeue(&sk->sk_receive_queue);
783 		if (skb)
784 			break;
785 
786 		if (flags & O_NONBLOCK) {
787 			err = -EWOULDBLOCK;
788 			break;
789 		}
790 		if (!signal_pending(current)) {
791 			release_sock(sk);
792 			schedule();
793 			lock_sock(sk);
794 			continue;
795 		}
796 		err = -ERESTARTSYS;
797 		break;
798 	}
799 	finish_wait(sk->sk_sleep, &wait);
800 	if (err)
801 		goto out_release;
802 
803 	newsk = skb->sk;
804 	newsk->sk_socket = newsock;
805 	newsk->sk_sleep = &newsock->wait;
806 
807 	/* Now attach up the new socket */
808 	kfree_skb(skb);
809 	sk_acceptq_removed(sk);
810 	newsock->sk = newsk;
811 
812 out_release:
813 	release_sock(sk);
814 
815 	return err;
816 }
817 
818 static int nr_getname(struct socket *sock, struct sockaddr *uaddr,
819 	int *uaddr_len, int peer)
820 {
821 	struct full_sockaddr_ax25 *sax = (struct full_sockaddr_ax25 *)uaddr;
822 	struct sock *sk = sock->sk;
823 	struct nr_sock *nr = nr_sk(sk);
824 
825 	lock_sock(sk);
826 	if (peer != 0) {
827 		if (sk->sk_state != TCP_ESTABLISHED) {
828 			release_sock(sk);
829 			return -ENOTCONN;
830 		}
831 		sax->fsa_ax25.sax25_family = AF_NETROM;
832 		sax->fsa_ax25.sax25_ndigis = 1;
833 		sax->fsa_ax25.sax25_call   = nr->user_addr;
834 		sax->fsa_digipeater[0]     = nr->dest_addr;
835 		*uaddr_len = sizeof(struct full_sockaddr_ax25);
836 	} else {
837 		sax->fsa_ax25.sax25_family = AF_NETROM;
838 		sax->fsa_ax25.sax25_ndigis = 0;
839 		sax->fsa_ax25.sax25_call   = nr->source_addr;
840 		*uaddr_len = sizeof(struct sockaddr_ax25);
841 	}
842 	release_sock(sk);
843 
844 	return 0;
845 }
846 
847 int nr_rx_frame(struct sk_buff *skb, struct net_device *dev)
848 {
849 	struct sock *sk;
850 	struct sock *make;
851 	struct nr_sock *nr_make;
852 	ax25_address *src, *dest, *user;
853 	unsigned short circuit_index, circuit_id;
854 	unsigned short peer_circuit_index, peer_circuit_id;
855 	unsigned short frametype, flags, window, timeout;
856 	int ret;
857 
858 	skb->sk = NULL;		/* Initially we don't know who it's for */
859 
860 	/*
861 	 *	skb->data points to the netrom frame start
862 	 */
863 
864 	src  = (ax25_address *)(skb->data + 0);
865 	dest = (ax25_address *)(skb->data + 7);
866 
867 	circuit_index      = skb->data[15];
868 	circuit_id         = skb->data[16];
869 	peer_circuit_index = skb->data[17];
870 	peer_circuit_id    = skb->data[18];
871 	frametype          = skb->data[19] & 0x0F;
872 	flags              = skb->data[19] & 0xF0;
873 
874 	/*
875 	 * Check for an incoming IP over NET/ROM frame.
876 	 */
877 	if (frametype == NR_PROTOEXT &&
878 	    circuit_index == NR_PROTO_IP && circuit_id == NR_PROTO_IP) {
879 		skb_pull(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN);
880 		skb_reset_transport_header(skb);
881 
882 		return nr_rx_ip(skb, dev);
883 	}
884 
885 	/*
886 	 * Find an existing socket connection, based on circuit ID, if it's
887 	 * a Connect Request base it on their circuit ID.
888 	 *
889 	 * Circuit ID 0/0 is not valid but it could still be a "reset" for a
890 	 * circuit that no longer exists at the other end ...
891 	 */
892 
893 	sk = NULL;
894 
895 	if (circuit_index == 0 && circuit_id == 0) {
896 		if (frametype == NR_CONNACK && flags == NR_CHOKE_FLAG)
897 			sk = nr_find_peer(peer_circuit_index, peer_circuit_id, src);
898 	} else {
899 		if (frametype == NR_CONNREQ)
900 			sk = nr_find_peer(circuit_index, circuit_id, src);
901 		else
902 			sk = nr_find_socket(circuit_index, circuit_id);
903 	}
904 
905 	if (sk != NULL) {
906 		skb_reset_transport_header(skb);
907 
908 		if (frametype == NR_CONNACK && skb->len == 22)
909 			nr_sk(sk)->bpqext = 1;
910 		else
911 			nr_sk(sk)->bpqext = 0;
912 
913 		ret = nr_process_rx_frame(sk, skb);
914 		bh_unlock_sock(sk);
915 		return ret;
916 	}
917 
918 	/*
919 	 * Now it should be a CONNREQ.
920 	 */
921 	if (frametype != NR_CONNREQ) {
922 		/*
923 		 * Here it would be nice to be able to send a reset but
924 		 * NET/ROM doesn't have one.  We've tried to extend the protocol
925 		 * by sending NR_CONNACK | NR_CHOKE_FLAGS replies but that
926 		 * apparently kills BPQ boxes... :-(
927 		 * So now we try to follow the established behaviour of
928 		 * G8PZT's Xrouter which is sending packets with command type 7
929 		 * as an extension of the protocol.
930 		 */
931 		if (sysctl_netrom_reset_circuit &&
932 		    (frametype != NR_RESET || flags != 0))
933 			nr_transmit_reset(skb, 1);
934 
935 		return 0;
936 	}
937 
938 	sk = nr_find_listener(dest);
939 
940 	user = (ax25_address *)(skb->data + 21);
941 
942 	if (sk == NULL || sk_acceptq_is_full(sk) ||
943 	    (make = nr_make_new(sk)) == NULL) {
944 		nr_transmit_refusal(skb, 0);
945 		if (sk)
946 			bh_unlock_sock(sk);
947 		return 0;
948 	}
949 
950 	window = skb->data[20];
951 
952 	skb->sk             = make;
953 	make->sk_state	    = TCP_ESTABLISHED;
954 
955 	/* Fill in his circuit details */
956 	nr_make = nr_sk(make);
957 	nr_make->source_addr = *dest;
958 	nr_make->dest_addr   = *src;
959 	nr_make->user_addr   = *user;
960 
961 	nr_make->your_index  = circuit_index;
962 	nr_make->your_id     = circuit_id;
963 
964 	bh_unlock_sock(sk);
965 	circuit = nr_find_next_circuit();
966 	bh_lock_sock(sk);
967 
968 	nr_make->my_index    = circuit / 256;
969 	nr_make->my_id       = circuit % 256;
970 
971 	circuit++;
972 
973 	/* Window negotiation */
974 	if (window < nr_make->window)
975 		nr_make->window = window;
976 
977 	/* L4 timeout negotiation */
978 	if (skb->len == 37) {
979 		timeout = skb->data[36] * 256 + skb->data[35];
980 		if (timeout * HZ < nr_make->t1)
981 			nr_make->t1 = timeout * HZ;
982 		nr_make->bpqext = 1;
983 	} else {
984 		nr_make->bpqext = 0;
985 	}
986 
987 	nr_write_internal(make, NR_CONNACK);
988 
989 	nr_make->condition = 0x00;
990 	nr_make->vs        = 0;
991 	nr_make->va        = 0;
992 	nr_make->vr        = 0;
993 	nr_make->vl        = 0;
994 	nr_make->state     = NR_STATE_3;
995 	sk_acceptq_added(sk);
996 	skb_queue_head(&sk->sk_receive_queue, skb);
997 
998 	if (!sock_flag(sk, SOCK_DEAD))
999 		sk->sk_data_ready(sk, skb->len);
1000 
1001 	bh_unlock_sock(sk);
1002 
1003 	nr_insert_socket(make);
1004 
1005 	nr_start_heartbeat(make);
1006 	nr_start_idletimer(make);
1007 
1008 	return 1;
1009 }
1010 
1011 static int nr_sendmsg(struct kiocb *iocb, struct socket *sock,
1012 		      struct msghdr *msg, size_t len)
1013 {
1014 	struct sock *sk = sock->sk;
1015 	struct nr_sock *nr = nr_sk(sk);
1016 	struct sockaddr_ax25 *usax = (struct sockaddr_ax25 *)msg->msg_name;
1017 	int err;
1018 	struct sockaddr_ax25 sax;
1019 	struct sk_buff *skb;
1020 	unsigned char *asmptr;
1021 	int size;
1022 
1023 	if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT))
1024 		return -EINVAL;
1025 
1026 	lock_sock(sk);
1027 	if (sock_flag(sk, SOCK_ZAPPED)) {
1028 		err = -EADDRNOTAVAIL;
1029 		goto out;
1030 	}
1031 
1032 	if (sk->sk_shutdown & SEND_SHUTDOWN) {
1033 		send_sig(SIGPIPE, current, 0);
1034 		err = -EPIPE;
1035 		goto out;
1036 	}
1037 
1038 	if (nr->device == NULL) {
1039 		err = -ENETUNREACH;
1040 		goto out;
1041 	}
1042 
1043 	if (usax) {
1044 		if (msg->msg_namelen < sizeof(sax)) {
1045 			err = -EINVAL;
1046 			goto out;
1047 		}
1048 		sax = *usax;
1049 		if (ax25cmp(&nr->dest_addr, &sax.sax25_call) != 0) {
1050 			err = -EISCONN;
1051 			goto out;
1052 		}
1053 		if (sax.sax25_family != AF_NETROM) {
1054 			err = -EINVAL;
1055 			goto out;
1056 		}
1057 	} else {
1058 		if (sk->sk_state != TCP_ESTABLISHED) {
1059 			err = -ENOTCONN;
1060 			goto out;
1061 		}
1062 		sax.sax25_family = AF_NETROM;
1063 		sax.sax25_call   = nr->dest_addr;
1064 	}
1065 
1066 	SOCK_DEBUG(sk, "NET/ROM: sendto: Addresses built.\n");
1067 
1068 	/* Build a packet */
1069 	SOCK_DEBUG(sk, "NET/ROM: sendto: building packet.\n");
1070 	size = len + NR_NETWORK_LEN + NR_TRANSPORT_LEN;
1071 
1072 	if ((skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL)
1073 		goto out;
1074 
1075 	skb_reserve(skb, size - len);
1076 	skb_reset_transport_header(skb);
1077 
1078 	/*
1079 	 *	Push down the NET/ROM header
1080 	 */
1081 
1082 	asmptr = skb_push(skb, NR_TRANSPORT_LEN);
1083 	SOCK_DEBUG(sk, "Building NET/ROM Header.\n");
1084 
1085 	/* Build a NET/ROM Transport header */
1086 
1087 	*asmptr++ = nr->your_index;
1088 	*asmptr++ = nr->your_id;
1089 	*asmptr++ = 0;		/* To be filled in later */
1090 	*asmptr++ = 0;		/*      Ditto            */
1091 	*asmptr++ = NR_INFO;
1092 	SOCK_DEBUG(sk, "Built header.\n");
1093 
1094 	/*
1095 	 *	Put the data on the end
1096 	 */
1097 	skb_put(skb, len);
1098 
1099 	SOCK_DEBUG(sk, "NET/ROM: Appending user data\n");
1100 
1101 	/* User data follows immediately after the NET/ROM transport header */
1102 	if (memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len)) {
1103 		kfree_skb(skb);
1104 		err = -EFAULT;
1105 		goto out;
1106 	}
1107 
1108 	SOCK_DEBUG(sk, "NET/ROM: Transmitting buffer\n");
1109 
1110 	if (sk->sk_state != TCP_ESTABLISHED) {
1111 		kfree_skb(skb);
1112 		err = -ENOTCONN;
1113 		goto out;
1114 	}
1115 
1116 	nr_output(sk, skb);	/* Shove it onto the queue */
1117 
1118 	err = len;
1119 out:
1120 	release_sock(sk);
1121 	return err;
1122 }
1123 
1124 static int nr_recvmsg(struct kiocb *iocb, struct socket *sock,
1125 		      struct msghdr *msg, size_t size, int flags)
1126 {
1127 	struct sock *sk = sock->sk;
1128 	struct sockaddr_ax25 *sax = (struct sockaddr_ax25 *)msg->msg_name;
1129 	size_t copied;
1130 	struct sk_buff *skb;
1131 	int er;
1132 
1133 	/*
1134 	 * This works for seqpacket too. The receiver has ordered the queue for
1135 	 * us! We do one quick check first though
1136 	 */
1137 
1138 	lock_sock(sk);
1139 	if (sk->sk_state != TCP_ESTABLISHED) {
1140 		release_sock(sk);
1141 		return -ENOTCONN;
1142 	}
1143 
1144 	/* Now we can treat all alike */
1145 	if ((skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, flags & MSG_DONTWAIT, &er)) == NULL) {
1146 		release_sock(sk);
1147 		return er;
1148 	}
1149 
1150 	skb_reset_transport_header(skb);
1151 	copied     = skb->len;
1152 
1153 	if (copied > size) {
1154 		copied = size;
1155 		msg->msg_flags |= MSG_TRUNC;
1156 	}
1157 
1158 	skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1159 
1160 	if (sax != NULL) {
1161 		sax->sax25_family = AF_NETROM;
1162 		skb_copy_from_linear_data_offset(skb, 7, sax->sax25_call.ax25_call,
1163 			      AX25_ADDR_LEN);
1164 	}
1165 
1166 	msg->msg_namelen = sizeof(*sax);
1167 
1168 	skb_free_datagram(sk, skb);
1169 
1170 	release_sock(sk);
1171 	return copied;
1172 }
1173 
1174 
1175 static int nr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1176 {
1177 	struct sock *sk = sock->sk;
1178 	void __user *argp = (void __user *)arg;
1179 	int ret;
1180 
1181 	switch (cmd) {
1182 	case TIOCOUTQ: {
1183 		long amount;
1184 
1185 		lock_sock(sk);
1186 		amount = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc);
1187 		if (amount < 0)
1188 			amount = 0;
1189 		release_sock(sk);
1190 		return put_user(amount, (int __user *)argp);
1191 	}
1192 
1193 	case TIOCINQ: {
1194 		struct sk_buff *skb;
1195 		long amount = 0L;
1196 
1197 		lock_sock(sk);
1198 		/* These two are safe on a single CPU system as only user tasks fiddle here */
1199 		if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1200 			amount = skb->len;
1201 		release_sock(sk);
1202 		return put_user(amount, (int __user *)argp);
1203 	}
1204 
1205 	case SIOCGSTAMP:
1206 		lock_sock(sk);
1207 		ret = sock_get_timestamp(sk, argp);
1208 		release_sock(sk);
1209 		return ret;
1210 
1211 	case SIOCGSTAMPNS:
1212 		lock_sock(sk);
1213 		ret = sock_get_timestampns(sk, argp);
1214 		release_sock(sk);
1215 		return ret;
1216 
1217 	case SIOCGIFADDR:
1218 	case SIOCSIFADDR:
1219 	case SIOCGIFDSTADDR:
1220 	case SIOCSIFDSTADDR:
1221 	case SIOCGIFBRDADDR:
1222 	case SIOCSIFBRDADDR:
1223 	case SIOCGIFNETMASK:
1224 	case SIOCSIFNETMASK:
1225 	case SIOCGIFMETRIC:
1226 	case SIOCSIFMETRIC:
1227 		return -EINVAL;
1228 
1229 	case SIOCADDRT:
1230 	case SIOCDELRT:
1231 	case SIOCNRDECOBS:
1232 		if (!capable(CAP_NET_ADMIN)) return -EPERM;
1233 		return nr_rt_ioctl(cmd, argp);
1234 
1235 	default:
1236 		return -ENOIOCTLCMD;
1237 	}
1238 
1239 	return 0;
1240 }
1241 
1242 #ifdef CONFIG_PROC_FS
1243 
1244 static void *nr_info_start(struct seq_file *seq, loff_t *pos)
1245 {
1246 	struct sock *s;
1247 	struct hlist_node *node;
1248 	int i = 1;
1249 
1250 	spin_lock_bh(&nr_list_lock);
1251 	if (*pos == 0)
1252 		return SEQ_START_TOKEN;
1253 
1254 	sk_for_each(s, node, &nr_list) {
1255 		if (i == *pos)
1256 			return s;
1257 		++i;
1258 	}
1259 	return NULL;
1260 }
1261 
1262 static void *nr_info_next(struct seq_file *seq, void *v, loff_t *pos)
1263 {
1264 	++*pos;
1265 
1266 	return (v == SEQ_START_TOKEN) ? sk_head(&nr_list)
1267 		: sk_next((struct sock *)v);
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 = 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 			atomic_read(&s->sk_wmem_alloc),
1323 			atomic_read(&s->sk_rmem_alloc),
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 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 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(sizeof(struct nr_private), 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 		lockdep_set_class(&dev->_xmit_lock, &nr_netdev_xmit_lock_key);
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("nr", S_IRUGO, &nr_info_fops);
1451 	proc_net_fops_create("nr_neigh", S_IRUGO, &nr_neigh_fops);
1452 	proc_net_fops_create("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("nr");
1481 	proc_net_remove("nr_neigh");
1482 	proc_net_remove("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