xref: /openbmc/linux/net/netrom/af_netrom.c (revision 9ac8d3fb)
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 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 (atomic_read(&sk->sk_wmem_alloc) ||
290 	    atomic_read(&sk->sk_rmem_alloc)) {
291 		/* Defer: outstanding buffers */
292 		sk->sk_timer.function = nr_destroy_timer;
293 		sk->sk_timer.expires  = jiffies + 2 * HZ;
294 		add_timer(&sk->sk_timer);
295 	} else
296 		sock_put(sk);
297 }
298 
299 /*
300  *	Handling for system calls applied via the various interfaces to a
301  *	NET/ROM socket object.
302  */
303 
304 static int nr_setsockopt(struct socket *sock, int level, int optname,
305 	char __user *optval, int optlen)
306 {
307 	struct sock *sk = sock->sk;
308 	struct nr_sock *nr = nr_sk(sk);
309 	int opt;
310 
311 	if (level != SOL_NETROM)
312 		return -ENOPROTOOPT;
313 
314 	if (optlen < sizeof(int))
315 		return -EINVAL;
316 
317 	if (get_user(opt, (int __user *)optval))
318 		return -EFAULT;
319 
320 	switch (optname) {
321 	case NETROM_T1:
322 		if (opt < 1)
323 			return -EINVAL;
324 		nr->t1 = opt * HZ;
325 		return 0;
326 
327 	case NETROM_T2:
328 		if (opt < 1)
329 			return -EINVAL;
330 		nr->t2 = opt * HZ;
331 		return 0;
332 
333 	case NETROM_N2:
334 		if (opt < 1 || opt > 31)
335 			return -EINVAL;
336 		nr->n2 = opt;
337 		return 0;
338 
339 	case NETROM_T4:
340 		if (opt < 1)
341 			return -EINVAL;
342 		nr->t4 = opt * HZ;
343 		return 0;
344 
345 	case NETROM_IDLE:
346 		if (opt < 0)
347 			return -EINVAL;
348 		nr->idle = opt * 60 * HZ;
349 		return 0;
350 
351 	default:
352 		return -ENOPROTOOPT;
353 	}
354 }
355 
356 static int nr_getsockopt(struct socket *sock, int level, int optname,
357 	char __user *optval, int __user *optlen)
358 {
359 	struct sock *sk = sock->sk;
360 	struct nr_sock *nr = nr_sk(sk);
361 	int val = 0;
362 	int len;
363 
364 	if (level != SOL_NETROM)
365 		return -ENOPROTOOPT;
366 
367 	if (get_user(len, optlen))
368 		return -EFAULT;
369 
370 	if (len < 0)
371 		return -EINVAL;
372 
373 	switch (optname) {
374 	case NETROM_T1:
375 		val = nr->t1 / HZ;
376 		break;
377 
378 	case NETROM_T2:
379 		val = nr->t2 / HZ;
380 		break;
381 
382 	case NETROM_N2:
383 		val = nr->n2;
384 		break;
385 
386 	case NETROM_T4:
387 		val = nr->t4 / HZ;
388 		break;
389 
390 	case NETROM_IDLE:
391 		val = nr->idle / (60 * HZ);
392 		break;
393 
394 	default:
395 		return -ENOPROTOOPT;
396 	}
397 
398 	len = min_t(unsigned int, len, sizeof(int));
399 
400 	if (put_user(len, optlen))
401 		return -EFAULT;
402 
403 	return copy_to_user(optval, &val, len) ? -EFAULT : 0;
404 }
405 
406 static int nr_listen(struct socket *sock, int backlog)
407 {
408 	struct sock *sk = sock->sk;
409 
410 	lock_sock(sk);
411 	if (sk->sk_state != TCP_LISTEN) {
412 		memset(&nr_sk(sk)->user_addr, 0, AX25_ADDR_LEN);
413 		sk->sk_max_ack_backlog = backlog;
414 		sk->sk_state           = TCP_LISTEN;
415 		release_sock(sk);
416 		return 0;
417 	}
418 	release_sock(sk);
419 
420 	return -EOPNOTSUPP;
421 }
422 
423 static struct proto nr_proto = {
424 	.name	  = "NETROM",
425 	.owner	  = THIS_MODULE,
426 	.obj_size = sizeof(struct nr_sock),
427 };
428 
429 static int nr_create(struct net *net, struct socket *sock, int protocol)
430 {
431 	struct sock *sk;
432 	struct nr_sock *nr;
433 
434 	if (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 		SOCK_DEBUG(sk, "NET/ROM: bind failed: invalid node callsign\n");
594 		release_sock(sk);
595 		return -EADDRNOTAVAIL;
596 	}
597 
598 	/*
599 	 * Only the super user can set an arbitrary user callsign.
600 	 */
601 	if (addr->fsa_ax25.sax25_ndigis == 1) {
602 		if (!capable(CAP_NET_BIND_SERVICE)) {
603 			dev_put(dev);
604 			release_sock(sk);
605 			return -EACCES;
606 		}
607 		nr->user_addr   = addr->fsa_digipeater[0];
608 		nr->source_addr = addr->fsa_ax25.sax25_call;
609 	} else {
610 		source = &addr->fsa_ax25.sax25_call;
611 
612 		user = ax25_findbyuid(current->euid);
613 		if (user) {
614 			nr->user_addr   = user->call;
615 			ax25_uid_put(user);
616 		} else {
617 			if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) {
618 				release_sock(sk);
619 				dev_put(dev);
620 				return -EPERM;
621 			}
622 			nr->user_addr   = *source;
623 		}
624 
625 		nr->source_addr = *source;
626 	}
627 
628 	nr->device = dev;
629 	nr_insert_socket(sk);
630 
631 	sock_reset_flag(sk, SOCK_ZAPPED);
632 	dev_put(dev);
633 	release_sock(sk);
634 	SOCK_DEBUG(sk, "NET/ROM: socket is bound\n");
635 	return 0;
636 }
637 
638 static int nr_connect(struct socket *sock, struct sockaddr *uaddr,
639 	int addr_len, int flags)
640 {
641 	struct sock *sk = sock->sk;
642 	struct nr_sock *nr = nr_sk(sk);
643 	struct sockaddr_ax25 *addr = (struct sockaddr_ax25 *)uaddr;
644 	ax25_address *source = NULL;
645 	ax25_uid_assoc *user;
646 	struct net_device *dev;
647 	int err = 0;
648 
649 	lock_sock(sk);
650 	if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
651 		sock->state = SS_CONNECTED;
652 		goto out_release;	/* Connect completed during a ERESTARTSYS event */
653 	}
654 
655 	if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
656 		sock->state = SS_UNCONNECTED;
657 		err = -ECONNREFUSED;
658 		goto out_release;
659 	}
660 
661 	if (sk->sk_state == TCP_ESTABLISHED) {
662 		err = -EISCONN;	/* No reconnect on a seqpacket socket */
663 		goto out_release;
664 	}
665 
666 	sk->sk_state   = TCP_CLOSE;
667 	sock->state = SS_UNCONNECTED;
668 
669 	if (addr_len != sizeof(struct sockaddr_ax25) && addr_len != sizeof(struct full_sockaddr_ax25)) {
670 		err = -EINVAL;
671 		goto out_release;
672 	}
673 	if (addr->sax25_family != AF_NETROM) {
674 		err = -EINVAL;
675 		goto out_release;
676 	}
677 	if (sock_flag(sk, SOCK_ZAPPED)) {	/* Must bind first - autobinding in this may or may not work */
678 		sock_reset_flag(sk, SOCK_ZAPPED);
679 
680 		if ((dev = nr_dev_first()) == NULL) {
681 			err = -ENETUNREACH;
682 			goto out_release;
683 		}
684 		source = (ax25_address *)dev->dev_addr;
685 
686 		user = ax25_findbyuid(current->euid);
687 		if (user) {
688 			nr->user_addr   = user->call;
689 			ax25_uid_put(user);
690 		} else {
691 			if (ax25_uid_policy && !capable(CAP_NET_ADMIN)) {
692 				dev_put(dev);
693 				err = -EPERM;
694 				goto out_release;
695 			}
696 			nr->user_addr   = *source;
697 		}
698 
699 		nr->source_addr = *source;
700 		nr->device      = dev;
701 
702 		dev_put(dev);
703 		nr_insert_socket(sk);		/* Finish the bind */
704 	}
705 
706 	nr->dest_addr = addr->sax25_call;
707 
708 	release_sock(sk);
709 	circuit = nr_find_next_circuit();
710 	lock_sock(sk);
711 
712 	nr->my_index = circuit / 256;
713 	nr->my_id    = circuit % 256;
714 
715 	circuit++;
716 
717 	/* Move to connecting socket, start sending Connect Requests */
718 	sock->state  = SS_CONNECTING;
719 	sk->sk_state = TCP_SYN_SENT;
720 
721 	nr_establish_data_link(sk);
722 
723 	nr->state = NR_STATE_1;
724 
725 	nr_start_heartbeat(sk);
726 
727 	/* Now the loop */
728 	if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) {
729 		err = -EINPROGRESS;
730 		goto out_release;
731 	}
732 
733 	/*
734 	 * A Connect Ack with Choke or timeout or failed routing will go to
735 	 * closed.
736 	 */
737 	if (sk->sk_state == TCP_SYN_SENT) {
738 		DEFINE_WAIT(wait);
739 
740 		for (;;) {
741 			prepare_to_wait(sk->sk_sleep, &wait,
742 					TASK_INTERRUPTIBLE);
743 			if (sk->sk_state != TCP_SYN_SENT)
744 				break;
745 			if (!signal_pending(current)) {
746 				release_sock(sk);
747 				schedule();
748 				lock_sock(sk);
749 				continue;
750 			}
751 			err = -ERESTARTSYS;
752 			break;
753 		}
754 		finish_wait(sk->sk_sleep, &wait);
755 		if (err)
756 			goto out_release;
757 	}
758 
759 	if (sk->sk_state != TCP_ESTABLISHED) {
760 		sock->state = SS_UNCONNECTED;
761 		err = sock_error(sk);	/* Always set at this point */
762 		goto out_release;
763 	}
764 
765 	sock->state = SS_CONNECTED;
766 
767 out_release:
768 	release_sock(sk);
769 
770 	return err;
771 }
772 
773 static int nr_accept(struct socket *sock, struct socket *newsock, int flags)
774 {
775 	struct sk_buff *skb;
776 	struct sock *newsk;
777 	DEFINE_WAIT(wait);
778 	struct sock *sk;
779 	int err = 0;
780 
781 	if ((sk = sock->sk) == NULL)
782 		return -EINVAL;
783 
784 	lock_sock(sk);
785 	if (sk->sk_type != SOCK_SEQPACKET) {
786 		err = -EOPNOTSUPP;
787 		goto out_release;
788 	}
789 
790 	if (sk->sk_state != TCP_LISTEN) {
791 		err = -EINVAL;
792 		goto out_release;
793 	}
794 
795 	/*
796 	 *	The write queue this time is holding sockets ready to use
797 	 *	hooked into the SABM we saved
798 	 */
799 	for (;;) {
800 		prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
801 		skb = skb_dequeue(&sk->sk_receive_queue);
802 		if (skb)
803 			break;
804 
805 		if (flags & O_NONBLOCK) {
806 			err = -EWOULDBLOCK;
807 			break;
808 		}
809 		if (!signal_pending(current)) {
810 			release_sock(sk);
811 			schedule();
812 			lock_sock(sk);
813 			continue;
814 		}
815 		err = -ERESTARTSYS;
816 		break;
817 	}
818 	finish_wait(sk->sk_sleep, &wait);
819 	if (err)
820 		goto out_release;
821 
822 	newsk = skb->sk;
823 	sock_graft(newsk, newsock);
824 
825 	/* Now attach up the new socket */
826 	kfree_skb(skb);
827 	sk_acceptq_removed(sk);
828 
829 out_release:
830 	release_sock(sk);
831 
832 	return err;
833 }
834 
835 static int nr_getname(struct socket *sock, struct sockaddr *uaddr,
836 	int *uaddr_len, int peer)
837 {
838 	struct full_sockaddr_ax25 *sax = (struct full_sockaddr_ax25 *)uaddr;
839 	struct sock *sk = sock->sk;
840 	struct nr_sock *nr = nr_sk(sk);
841 
842 	lock_sock(sk);
843 	if (peer != 0) {
844 		if (sk->sk_state != TCP_ESTABLISHED) {
845 			release_sock(sk);
846 			return -ENOTCONN;
847 		}
848 		sax->fsa_ax25.sax25_family = AF_NETROM;
849 		sax->fsa_ax25.sax25_ndigis = 1;
850 		sax->fsa_ax25.sax25_call   = nr->user_addr;
851 		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 	SOCK_DEBUG(sk, "NET/ROM: sendto: Addresses built.\n");
1084 
1085 	/* Build a packet */
1086 	SOCK_DEBUG(sk, "NET/ROM: sendto: building packet.\n");
1087 	size = len + NR_NETWORK_LEN + NR_TRANSPORT_LEN;
1088 
1089 	if ((skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL)
1090 		goto out;
1091 
1092 	skb_reserve(skb, size - len);
1093 	skb_reset_transport_header(skb);
1094 
1095 	/*
1096 	 *	Push down the NET/ROM header
1097 	 */
1098 
1099 	asmptr = skb_push(skb, NR_TRANSPORT_LEN);
1100 	SOCK_DEBUG(sk, "Building NET/ROM Header.\n");
1101 
1102 	/* Build a NET/ROM Transport header */
1103 
1104 	*asmptr++ = nr->your_index;
1105 	*asmptr++ = nr->your_id;
1106 	*asmptr++ = 0;		/* To be filled in later */
1107 	*asmptr++ = 0;		/*      Ditto            */
1108 	*asmptr++ = NR_INFO;
1109 	SOCK_DEBUG(sk, "Built header.\n");
1110 
1111 	/*
1112 	 *	Put the data on the end
1113 	 */
1114 	skb_put(skb, len);
1115 
1116 	SOCK_DEBUG(sk, "NET/ROM: Appending user data\n");
1117 
1118 	/* User data follows immediately after the NET/ROM transport header */
1119 	if (memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len)) {
1120 		kfree_skb(skb);
1121 		err = -EFAULT;
1122 		goto out;
1123 	}
1124 
1125 	SOCK_DEBUG(sk, "NET/ROM: Transmitting buffer\n");
1126 
1127 	if (sk->sk_state != TCP_ESTABLISHED) {
1128 		kfree_skb(skb);
1129 		err = -ENOTCONN;
1130 		goto out;
1131 	}
1132 
1133 	nr_output(sk, skb);	/* Shove it onto the queue */
1134 
1135 	err = len;
1136 out:
1137 	release_sock(sk);
1138 	return err;
1139 }
1140 
1141 static int nr_recvmsg(struct kiocb *iocb, struct socket *sock,
1142 		      struct msghdr *msg, size_t size, int flags)
1143 {
1144 	struct sock *sk = sock->sk;
1145 	struct sockaddr_ax25 *sax = (struct sockaddr_ax25 *)msg->msg_name;
1146 	size_t copied;
1147 	struct sk_buff *skb;
1148 	int er;
1149 
1150 	/*
1151 	 * This works for seqpacket too. The receiver has ordered the queue for
1152 	 * us! We do one quick check first though
1153 	 */
1154 
1155 	lock_sock(sk);
1156 	if (sk->sk_state != TCP_ESTABLISHED) {
1157 		release_sock(sk);
1158 		return -ENOTCONN;
1159 	}
1160 
1161 	/* Now we can treat all alike */
1162 	if ((skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, flags & MSG_DONTWAIT, &er)) == NULL) {
1163 		release_sock(sk);
1164 		return er;
1165 	}
1166 
1167 	skb_reset_transport_header(skb);
1168 	copied     = skb->len;
1169 
1170 	if (copied > size) {
1171 		copied = size;
1172 		msg->msg_flags |= MSG_TRUNC;
1173 	}
1174 
1175 	skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1176 
1177 	if (sax != NULL) {
1178 		sax->sax25_family = AF_NETROM;
1179 		skb_copy_from_linear_data_offset(skb, 7, sax->sax25_call.ax25_call,
1180 			      AX25_ADDR_LEN);
1181 	}
1182 
1183 	msg->msg_namelen = sizeof(*sax);
1184 
1185 	skb_free_datagram(sk, skb);
1186 
1187 	release_sock(sk);
1188 	return copied;
1189 }
1190 
1191 
1192 static int nr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1193 {
1194 	struct sock *sk = sock->sk;
1195 	void __user *argp = (void __user *)arg;
1196 	int ret;
1197 
1198 	switch (cmd) {
1199 	case TIOCOUTQ: {
1200 		long amount;
1201 
1202 		lock_sock(sk);
1203 		amount = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc);
1204 		if (amount < 0)
1205 			amount = 0;
1206 		release_sock(sk);
1207 		return put_user(amount, (int __user *)argp);
1208 	}
1209 
1210 	case TIOCINQ: {
1211 		struct sk_buff *skb;
1212 		long amount = 0L;
1213 
1214 		lock_sock(sk);
1215 		/* These two are safe on a single CPU system as only user tasks fiddle here */
1216 		if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1217 			amount = skb->len;
1218 		release_sock(sk);
1219 		return put_user(amount, (int __user *)argp);
1220 	}
1221 
1222 	case SIOCGSTAMP:
1223 		lock_sock(sk);
1224 		ret = sock_get_timestamp(sk, argp);
1225 		release_sock(sk);
1226 		return ret;
1227 
1228 	case SIOCGSTAMPNS:
1229 		lock_sock(sk);
1230 		ret = sock_get_timestampns(sk, argp);
1231 		release_sock(sk);
1232 		return ret;
1233 
1234 	case SIOCGIFADDR:
1235 	case SIOCSIFADDR:
1236 	case SIOCGIFDSTADDR:
1237 	case SIOCSIFDSTADDR:
1238 	case SIOCGIFBRDADDR:
1239 	case SIOCSIFBRDADDR:
1240 	case SIOCGIFNETMASK:
1241 	case SIOCSIFNETMASK:
1242 	case SIOCGIFMETRIC:
1243 	case SIOCSIFMETRIC:
1244 		return -EINVAL;
1245 
1246 	case SIOCADDRT:
1247 	case SIOCDELRT:
1248 	case SIOCNRDECOBS:
1249 		if (!capable(CAP_NET_ADMIN)) return -EPERM;
1250 		return nr_rt_ioctl(cmd, argp);
1251 
1252 	default:
1253 		return -ENOIOCTLCMD;
1254 	}
1255 
1256 	return 0;
1257 }
1258 
1259 #ifdef CONFIG_PROC_FS
1260 
1261 static void *nr_info_start(struct seq_file *seq, loff_t *pos)
1262 {
1263 	struct sock *s;
1264 	struct hlist_node *node;
1265 	int i = 1;
1266 
1267 	spin_lock_bh(&nr_list_lock);
1268 	if (*pos == 0)
1269 		return SEQ_START_TOKEN;
1270 
1271 	sk_for_each(s, node, &nr_list) {
1272 		if (i == *pos)
1273 			return s;
1274 		++i;
1275 	}
1276 	return NULL;
1277 }
1278 
1279 static void *nr_info_next(struct seq_file *seq, void *v, loff_t *pos)
1280 {
1281 	++*pos;
1282 
1283 	return (v == SEQ_START_TOKEN) ? sk_head(&nr_list)
1284 		: sk_next((struct sock *)v);
1285 }
1286 
1287 static void nr_info_stop(struct seq_file *seq, void *v)
1288 {
1289 	spin_unlock_bh(&nr_list_lock);
1290 }
1291 
1292 static int nr_info_show(struct seq_file *seq, void *v)
1293 {
1294 	struct sock *s = v;
1295 	struct net_device *dev;
1296 	struct nr_sock *nr;
1297 	const char *devname;
1298 	char buf[11];
1299 
1300 	if (v == SEQ_START_TOKEN)
1301 		seq_puts(seq,
1302 "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");
1303 
1304 	else {
1305 
1306 		bh_lock_sock(s);
1307 		nr = nr_sk(s);
1308 
1309 		if ((dev = nr->device) == NULL)
1310 			devname = "???";
1311 		else
1312 			devname = dev->name;
1313 
1314 		seq_printf(seq, "%-9s ", ax2asc(buf, &nr->user_addr));
1315 		seq_printf(seq, "%-9s ", ax2asc(buf, &nr->dest_addr));
1316 		seq_printf(seq,
1317 "%-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",
1318 			ax2asc(buf, &nr->source_addr),
1319 			devname,
1320 			nr->my_index,
1321 			nr->my_id,
1322 			nr->your_index,
1323 			nr->your_id,
1324 			nr->state,
1325 			nr->vs,
1326 			nr->vr,
1327 			nr->va,
1328 			ax25_display_timer(&nr->t1timer) / HZ,
1329 			nr->t1 / HZ,
1330 			ax25_display_timer(&nr->t2timer) / HZ,
1331 			nr->t2 / HZ,
1332 			ax25_display_timer(&nr->t4timer) / HZ,
1333 			nr->t4 / HZ,
1334 			ax25_display_timer(&nr->idletimer) / (60 * HZ),
1335 			nr->idle / (60 * HZ),
1336 			nr->n2count,
1337 			nr->n2,
1338 			nr->window,
1339 			atomic_read(&s->sk_wmem_alloc),
1340 			atomic_read(&s->sk_rmem_alloc),
1341 			s->sk_socket ? SOCK_INODE(s->sk_socket)->i_ino : 0L);
1342 
1343 		bh_unlock_sock(s);
1344 	}
1345 	return 0;
1346 }
1347 
1348 static const struct seq_operations nr_info_seqops = {
1349 	.start = nr_info_start,
1350 	.next = nr_info_next,
1351 	.stop = nr_info_stop,
1352 	.show = nr_info_show,
1353 };
1354 
1355 static int nr_info_open(struct inode *inode, struct file *file)
1356 {
1357 	return seq_open(file, &nr_info_seqops);
1358 }
1359 
1360 static const struct file_operations nr_info_fops = {
1361 	.owner = THIS_MODULE,
1362 	.open = nr_info_open,
1363 	.read = seq_read,
1364 	.llseek = seq_lseek,
1365 	.release = seq_release,
1366 };
1367 #endif	/* CONFIG_PROC_FS */
1368 
1369 static struct net_proto_family nr_family_ops = {
1370 	.family		=	PF_NETROM,
1371 	.create		=	nr_create,
1372 	.owner		=	THIS_MODULE,
1373 };
1374 
1375 static const struct proto_ops nr_proto_ops = {
1376 	.family		=	PF_NETROM,
1377 	.owner		=	THIS_MODULE,
1378 	.release	=	nr_release,
1379 	.bind		=	nr_bind,
1380 	.connect	=	nr_connect,
1381 	.socketpair	=	sock_no_socketpair,
1382 	.accept		=	nr_accept,
1383 	.getname	=	nr_getname,
1384 	.poll		=	datagram_poll,
1385 	.ioctl		=	nr_ioctl,
1386 	.listen		=	nr_listen,
1387 	.shutdown	=	sock_no_shutdown,
1388 	.setsockopt	=	nr_setsockopt,
1389 	.getsockopt	=	nr_getsockopt,
1390 	.sendmsg	=	nr_sendmsg,
1391 	.recvmsg	=	nr_recvmsg,
1392 	.mmap		=	sock_no_mmap,
1393 	.sendpage	=	sock_no_sendpage,
1394 };
1395 
1396 static struct notifier_block nr_dev_notifier = {
1397 	.notifier_call	=	nr_device_event,
1398 };
1399 
1400 static struct net_device **dev_nr;
1401 
1402 static struct ax25_protocol nr_pid = {
1403 	.pid	= AX25_P_NETROM,
1404 	.func	= nr_route_frame
1405 };
1406 
1407 static struct ax25_linkfail nr_linkfail_notifier = {
1408 	.func	= nr_link_failed,
1409 };
1410 
1411 static int __init nr_proto_init(void)
1412 {
1413 	int i;
1414 	int rc = proto_register(&nr_proto, 0);
1415 
1416 	if (rc != 0)
1417 		goto out;
1418 
1419 	if (nr_ndevs > 0x7fffffff/sizeof(struct net_device *)) {
1420 		printk(KERN_ERR "NET/ROM: nr_proto_init - nr_ndevs parameter to large\n");
1421 		return -1;
1422 	}
1423 
1424 	dev_nr = kzalloc(nr_ndevs * sizeof(struct net_device *), GFP_KERNEL);
1425 	if (dev_nr == NULL) {
1426 		printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device array\n");
1427 		return -1;
1428 	}
1429 
1430 	for (i = 0; i < nr_ndevs; i++) {
1431 		char name[IFNAMSIZ];
1432 		struct net_device *dev;
1433 
1434 		sprintf(name, "nr%d", i);
1435 		dev = alloc_netdev(sizeof(struct nr_private), name, nr_setup);
1436 		if (!dev) {
1437 			printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device structure\n");
1438 			goto fail;
1439 		}
1440 
1441 		dev->base_addr = i;
1442 		if (register_netdev(dev)) {
1443 			printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register network device\n");
1444 			free_netdev(dev);
1445 			goto fail;
1446 		}
1447 		nr_set_lockdep_key(dev);
1448 		dev_nr[i] = dev;
1449 	}
1450 
1451 	if (sock_register(&nr_family_ops)) {
1452 		printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register socket family\n");
1453 		goto fail;
1454 	}
1455 
1456 	register_netdevice_notifier(&nr_dev_notifier);
1457 
1458 	ax25_register_pid(&nr_pid);
1459 	ax25_linkfail_register(&nr_linkfail_notifier);
1460 
1461 #ifdef CONFIG_SYSCTL
1462 	nr_register_sysctl();
1463 #endif
1464 
1465 	nr_loopback_init();
1466 
1467 	proc_net_fops_create(&init_net, "nr", S_IRUGO, &nr_info_fops);
1468 	proc_net_fops_create(&init_net, "nr_neigh", S_IRUGO, &nr_neigh_fops);
1469 	proc_net_fops_create(&init_net, "nr_nodes", S_IRUGO, &nr_nodes_fops);
1470 out:
1471 	return rc;
1472 fail:
1473 	while (--i >= 0) {
1474 		unregister_netdev(dev_nr[i]);
1475 		free_netdev(dev_nr[i]);
1476 	}
1477 	kfree(dev_nr);
1478 	proto_unregister(&nr_proto);
1479 	rc = -1;
1480 	goto out;
1481 }
1482 
1483 module_init(nr_proto_init);
1484 
1485 module_param(nr_ndevs, int, 0);
1486 MODULE_PARM_DESC(nr_ndevs, "number of NET/ROM devices");
1487 
1488 MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>");
1489 MODULE_DESCRIPTION("The amateur radio NET/ROM network and transport layer protocol");
1490 MODULE_LICENSE("GPL");
1491 MODULE_ALIAS_NETPROTO(PF_NETROM);
1492 
1493 static void __exit nr_exit(void)
1494 {
1495 	int i;
1496 
1497 	proc_net_remove(&init_net, "nr");
1498 	proc_net_remove(&init_net, "nr_neigh");
1499 	proc_net_remove(&init_net, "nr_nodes");
1500 	nr_loopback_clear();
1501 
1502 	nr_rt_free();
1503 
1504 #ifdef CONFIG_SYSCTL
1505 	nr_unregister_sysctl();
1506 #endif
1507 
1508 	ax25_linkfail_release(&nr_linkfail_notifier);
1509 	ax25_protocol_release(AX25_P_NETROM);
1510 
1511 	unregister_netdevice_notifier(&nr_dev_notifier);
1512 
1513 	sock_unregister(PF_NETROM);
1514 
1515 	for (i = 0; i < nr_ndevs; i++) {
1516 		struct net_device *dev = dev_nr[i];
1517 		if (dev) {
1518 			unregister_netdev(dev);
1519 			free_netdev(dev);
1520 		}
1521 	}
1522 
1523 	kfree(dev_nr);
1524 	proto_unregister(&nr_proto);
1525 }
1526 module_exit(nr_exit);
1527