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[mirror_ubuntu-eoan-kernel.git] / net / netrom / af_netrom.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 *
4 * Copyright Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
5 * Copyright Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk)
6 * Copyright Darryl Miles G7LED (dlm@g7led.demon.co.uk)
7 */
8 #include <linux/module.h>
9 #include <linux/moduleparam.h>
10 #include <linux/capability.h>
11 #include <linux/errno.h>
12 #include <linux/types.h>
13 #include <linux/socket.h>
14 #include <linux/in.h>
15 #include <linux/slab.h>
16 #include <linux/kernel.h>
17 #include <linux/sched/signal.h>
18 #include <linux/timer.h>
19 #include <linux/string.h>
20 #include <linux/sockios.h>
21 #include <linux/net.h>
22 #include <linux/stat.h>
23 #include <net/ax25.h>
24 #include <linux/inet.h>
25 #include <linux/netdevice.h>
26 #include <linux/if_arp.h>
27 #include <linux/skbuff.h>
28 #include <net/net_namespace.h>
29 #include <net/sock.h>
30 #include <linux/uaccess.h>
31 #include <linux/fcntl.h>
32 #include <linux/termios.h> /* For TIOCINQ/OUTQ */
33 #include <linux/mm.h>
34 #include <linux/interrupt.h>
35 #include <linux/notifier.h>
36 #include <net/netrom.h>
37 #include <linux/proc_fs.h>
38 #include <linux/seq_file.h>
39 #include <net/ip.h>
40 #include <net/tcp_states.h>
41 #include <net/arp.h>
42 #include <linux/init.h>
43
44 static int nr_ndevs = 4;
45
46 int sysctl_netrom_default_path_quality = NR_DEFAULT_QUAL;
47 int sysctl_netrom_obsolescence_count_initialiser = NR_DEFAULT_OBS;
48 int sysctl_netrom_network_ttl_initialiser = NR_DEFAULT_TTL;
49 int sysctl_netrom_transport_timeout = NR_DEFAULT_T1;
50 int sysctl_netrom_transport_maximum_tries = NR_DEFAULT_N2;
51 int sysctl_netrom_transport_acknowledge_delay = NR_DEFAULT_T2;
52 int sysctl_netrom_transport_busy_delay = NR_DEFAULT_T4;
53 int sysctl_netrom_transport_requested_window_size = NR_DEFAULT_WINDOW;
54 int sysctl_netrom_transport_no_activity_timeout = NR_DEFAULT_IDLE;
55 int sysctl_netrom_routing_control = NR_DEFAULT_ROUTING;
56 int sysctl_netrom_link_fails_count = NR_DEFAULT_FAILS;
57 int sysctl_netrom_reset_circuit = NR_DEFAULT_RESET;
58
59 static unsigned short circuit = 0x101;
60
61 static HLIST_HEAD(nr_list);
62 static DEFINE_SPINLOCK(nr_list_lock);
63
64 static const struct proto_ops nr_proto_ops;
65
66 /*
67 * NETROM network devices are virtual network devices encapsulating NETROM
68 * frames into AX.25 which will be sent through an AX.25 device, so form a
69 * special "super class" of normal net devices; split their locks off into a
70 * separate class since they always nest.
71 */
72 static struct lock_class_key nr_netdev_xmit_lock_key;
73 static struct lock_class_key nr_netdev_addr_lock_key;
74
75 static void nr_set_lockdep_one(struct net_device *dev,
76 struct netdev_queue *txq,
77 void *_unused)
78 {
79 lockdep_set_class(&txq->_xmit_lock, &nr_netdev_xmit_lock_key);
80 }
81
82 static void nr_set_lockdep_key(struct net_device *dev)
83 {
84 lockdep_set_class(&dev->addr_list_lock, &nr_netdev_addr_lock_key);
85 netdev_for_each_tx_queue(dev, nr_set_lockdep_one, NULL);
86 }
87
88 /*
89 * Socket removal during an interrupt is now safe.
90 */
91 static void nr_remove_socket(struct sock *sk)
92 {
93 spin_lock_bh(&nr_list_lock);
94 sk_del_node_init(sk);
95 spin_unlock_bh(&nr_list_lock);
96 }
97
98 /*
99 * Kill all bound sockets on a dropped device.
100 */
101 static void nr_kill_by_device(struct net_device *dev)
102 {
103 struct sock *s;
104
105 spin_lock_bh(&nr_list_lock);
106 sk_for_each(s, &nr_list)
107 if (nr_sk(s)->device == dev)
108 nr_disconnect(s, ENETUNREACH);
109 spin_unlock_bh(&nr_list_lock);
110 }
111
112 /*
113 * Handle device status changes.
114 */
115 static int nr_device_event(struct notifier_block *this, unsigned long event, void *ptr)
116 {
117 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
118
119 if (!net_eq(dev_net(dev), &init_net))
120 return NOTIFY_DONE;
121
122 if (event != NETDEV_DOWN)
123 return NOTIFY_DONE;
124
125 nr_kill_by_device(dev);
126 nr_rt_device_down(dev);
127
128 return NOTIFY_DONE;
129 }
130
131 /*
132 * Add a socket to the bound sockets list.
133 */
134 static void nr_insert_socket(struct sock *sk)
135 {
136 spin_lock_bh(&nr_list_lock);
137 sk_add_node(sk, &nr_list);
138 spin_unlock_bh(&nr_list_lock);
139 }
140
141 /*
142 * Find a socket that wants to accept the Connect Request we just
143 * received.
144 */
145 static struct sock *nr_find_listener(ax25_address *addr)
146 {
147 struct sock *s;
148
149 spin_lock_bh(&nr_list_lock);
150 sk_for_each(s, &nr_list)
151 if (!ax25cmp(&nr_sk(s)->source_addr, addr) &&
152 s->sk_state == TCP_LISTEN) {
153 sock_hold(s);
154 goto found;
155 }
156 s = NULL;
157 found:
158 spin_unlock_bh(&nr_list_lock);
159 return s;
160 }
161
162 /*
163 * Find a connected NET/ROM socket given my circuit IDs.
164 */
165 static struct sock *nr_find_socket(unsigned char index, unsigned char id)
166 {
167 struct sock *s;
168
169 spin_lock_bh(&nr_list_lock);
170 sk_for_each(s, &nr_list) {
171 struct nr_sock *nr = nr_sk(s);
172
173 if (nr->my_index == index && nr->my_id == id) {
174 sock_hold(s);
175 goto found;
176 }
177 }
178 s = NULL;
179 found:
180 spin_unlock_bh(&nr_list_lock);
181 return s;
182 }
183
184 /*
185 * Find a connected NET/ROM socket given their circuit IDs.
186 */
187 static struct sock *nr_find_peer(unsigned char index, unsigned char id,
188 ax25_address *dest)
189 {
190 struct sock *s;
191
192 spin_lock_bh(&nr_list_lock);
193 sk_for_each(s, &nr_list) {
194 struct nr_sock *nr = nr_sk(s);
195
196 if (nr->your_index == index && nr->your_id == id &&
197 !ax25cmp(&nr->dest_addr, dest)) {
198 sock_hold(s);
199 goto found;
200 }
201 }
202 s = NULL;
203 found:
204 spin_unlock_bh(&nr_list_lock);
205 return s;
206 }
207
208 /*
209 * Find next free circuit ID.
210 */
211 static unsigned short nr_find_next_circuit(void)
212 {
213 unsigned short id = circuit;
214 unsigned char i, j;
215 struct sock *sk;
216
217 for (;;) {
218 i = id / 256;
219 j = id % 256;
220
221 if (i != 0 && j != 0) {
222 if ((sk=nr_find_socket(i, j)) == NULL)
223 break;
224 sock_put(sk);
225 }
226
227 id++;
228 }
229
230 return id;
231 }
232
233 /*
234 * Deferred destroy.
235 */
236 void nr_destroy_socket(struct sock *);
237
238 /*
239 * Handler for deferred kills.
240 */
241 static void nr_destroy_timer(struct timer_list *t)
242 {
243 struct sock *sk = from_timer(sk, t, sk_timer);
244 bh_lock_sock(sk);
245 sock_hold(sk);
246 nr_destroy_socket(sk);
247 bh_unlock_sock(sk);
248 sock_put(sk);
249 }
250
251 /*
252 * This is called from user mode and the timers. Thus it protects itself
253 * against interrupt users but doesn't worry about being called during
254 * work. Once it is removed from the queue no interrupt or bottom half
255 * will touch it and we are (fairly 8-) ) safe.
256 */
257 void nr_destroy_socket(struct sock *sk)
258 {
259 struct sk_buff *skb;
260
261 nr_remove_socket(sk);
262
263 nr_stop_heartbeat(sk);
264 nr_stop_t1timer(sk);
265 nr_stop_t2timer(sk);
266 nr_stop_t4timer(sk);
267 nr_stop_idletimer(sk);
268
269 nr_clear_queues(sk); /* Flush the queues */
270
271 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
272 if (skb->sk != sk) { /* A pending connection */
273 /* Queue the unaccepted socket for death */
274 sock_set_flag(skb->sk, SOCK_DEAD);
275 nr_start_heartbeat(skb->sk);
276 nr_sk(skb->sk)->state = NR_STATE_0;
277 }
278
279 kfree_skb(skb);
280 }
281
282 if (sk_has_allocations(sk)) {
283 /* Defer: outstanding buffers */
284 sk->sk_timer.function = nr_destroy_timer;
285 sk->sk_timer.expires = jiffies + 2 * HZ;
286 add_timer(&sk->sk_timer);
287 } else
288 sock_put(sk);
289 }
290
291 /*
292 * Handling for system calls applied via the various interfaces to a
293 * NET/ROM socket object.
294 */
295
296 static int nr_setsockopt(struct socket *sock, int level, int optname,
297 char __user *optval, unsigned int optlen)
298 {
299 struct sock *sk = sock->sk;
300 struct nr_sock *nr = nr_sk(sk);
301 unsigned long opt;
302
303 if (level != SOL_NETROM)
304 return -ENOPROTOOPT;
305
306 if (optlen < sizeof(unsigned int))
307 return -EINVAL;
308
309 if (get_user(opt, (unsigned int __user *)optval))
310 return -EFAULT;
311
312 switch (optname) {
313 case NETROM_T1:
314 if (opt < 1 || opt > ULONG_MAX / HZ)
315 return -EINVAL;
316 nr->t1 = opt * HZ;
317 return 0;
318
319 case NETROM_T2:
320 if (opt < 1 || opt > ULONG_MAX / HZ)
321 return -EINVAL;
322 nr->t2 = opt * HZ;
323 return 0;
324
325 case NETROM_N2:
326 if (opt < 1 || opt > 31)
327 return -EINVAL;
328 nr->n2 = opt;
329 return 0;
330
331 case NETROM_T4:
332 if (opt < 1 || opt > ULONG_MAX / HZ)
333 return -EINVAL;
334 nr->t4 = opt * HZ;
335 return 0;
336
337 case NETROM_IDLE:
338 if (opt > ULONG_MAX / (60 * HZ))
339 return -EINVAL;
340 nr->idle = opt * 60 * HZ;
341 return 0;
342
343 default:
344 return -ENOPROTOOPT;
345 }
346 }
347
348 static int nr_getsockopt(struct socket *sock, int level, int optname,
349 char __user *optval, int __user *optlen)
350 {
351 struct sock *sk = sock->sk;
352 struct nr_sock *nr = nr_sk(sk);
353 int val = 0;
354 int len;
355
356 if (level != SOL_NETROM)
357 return -ENOPROTOOPT;
358
359 if (get_user(len, optlen))
360 return -EFAULT;
361
362 if (len < 0)
363 return -EINVAL;
364
365 switch (optname) {
366 case NETROM_T1:
367 val = nr->t1 / HZ;
368 break;
369
370 case NETROM_T2:
371 val = nr->t2 / HZ;
372 break;
373
374 case NETROM_N2:
375 val = nr->n2;
376 break;
377
378 case NETROM_T4:
379 val = nr->t4 / HZ;
380 break;
381
382 case NETROM_IDLE:
383 val = nr->idle / (60 * HZ);
384 break;
385
386 default:
387 return -ENOPROTOOPT;
388 }
389
390 len = min_t(unsigned int, len, sizeof(int));
391
392 if (put_user(len, optlen))
393 return -EFAULT;
394
395 return copy_to_user(optval, &val, len) ? -EFAULT : 0;
396 }
397
398 static int nr_listen(struct socket *sock, int backlog)
399 {
400 struct sock *sk = sock->sk;
401
402 lock_sock(sk);
403 if (sk->sk_state != TCP_LISTEN) {
404 memset(&nr_sk(sk)->user_addr, 0, AX25_ADDR_LEN);
405 sk->sk_max_ack_backlog = backlog;
406 sk->sk_state = TCP_LISTEN;
407 release_sock(sk);
408 return 0;
409 }
410 release_sock(sk);
411
412 return -EOPNOTSUPP;
413 }
414
415 static struct proto nr_proto = {
416 .name = "NETROM",
417 .owner = THIS_MODULE,
418 .obj_size = sizeof(struct nr_sock),
419 };
420
421 static int nr_create(struct net *net, struct socket *sock, int protocol,
422 int kern)
423 {
424 struct sock *sk;
425 struct nr_sock *nr;
426
427 if (!net_eq(net, &init_net))
428 return -EAFNOSUPPORT;
429
430 if (sock->type != SOCK_SEQPACKET || protocol != 0)
431 return -ESOCKTNOSUPPORT;
432
433 sk = sk_alloc(net, PF_NETROM, GFP_ATOMIC, &nr_proto, kern);
434 if (sk == NULL)
435 return -ENOMEM;
436
437 nr = nr_sk(sk);
438
439 sock_init_data(sock, sk);
440
441 sock->ops = &nr_proto_ops;
442 sk->sk_protocol = protocol;
443
444 skb_queue_head_init(&nr->ack_queue);
445 skb_queue_head_init(&nr->reseq_queue);
446 skb_queue_head_init(&nr->frag_queue);
447
448 nr_init_timers(sk);
449
450 nr->t1 =
451 msecs_to_jiffies(sysctl_netrom_transport_timeout);
452 nr->t2 =
453 msecs_to_jiffies(sysctl_netrom_transport_acknowledge_delay);
454 nr->n2 =
455 msecs_to_jiffies(sysctl_netrom_transport_maximum_tries);
456 nr->t4 =
457 msecs_to_jiffies(sysctl_netrom_transport_busy_delay);
458 nr->idle =
459 msecs_to_jiffies(sysctl_netrom_transport_no_activity_timeout);
460 nr->window = sysctl_netrom_transport_requested_window_size;
461
462 nr->bpqext = 1;
463 nr->state = NR_STATE_0;
464
465 return 0;
466 }
467
468 static struct sock *nr_make_new(struct sock *osk)
469 {
470 struct sock *sk;
471 struct nr_sock *nr, *onr;
472
473 if (osk->sk_type != SOCK_SEQPACKET)
474 return NULL;
475
476 sk = sk_alloc(sock_net(osk), PF_NETROM, GFP_ATOMIC, osk->sk_prot, 0);
477 if (sk == NULL)
478 return NULL;
479
480 nr = nr_sk(sk);
481
482 sock_init_data(NULL, sk);
483
484 sk->sk_type = osk->sk_type;
485 sk->sk_priority = osk->sk_priority;
486 sk->sk_protocol = osk->sk_protocol;
487 sk->sk_rcvbuf = osk->sk_rcvbuf;
488 sk->sk_sndbuf = osk->sk_sndbuf;
489 sk->sk_state = TCP_ESTABLISHED;
490 sock_copy_flags(sk, osk);
491
492 skb_queue_head_init(&nr->ack_queue);
493 skb_queue_head_init(&nr->reseq_queue);
494 skb_queue_head_init(&nr->frag_queue);
495
496 nr_init_timers(sk);
497
498 onr = nr_sk(osk);
499
500 nr->t1 = onr->t1;
501 nr->t2 = onr->t2;
502 nr->n2 = onr->n2;
503 nr->t4 = onr->t4;
504 nr->idle = onr->idle;
505 nr->window = onr->window;
506
507 nr->device = onr->device;
508 nr->bpqext = onr->bpqext;
509
510 return sk;
511 }
512
513 static int nr_release(struct socket *sock)
514 {
515 struct sock *sk = sock->sk;
516 struct nr_sock *nr;
517
518 if (sk == NULL) return 0;
519
520 sock_hold(sk);
521 sock_orphan(sk);
522 lock_sock(sk);
523 nr = nr_sk(sk);
524
525 switch (nr->state) {
526 case NR_STATE_0:
527 case NR_STATE_1:
528 case NR_STATE_2:
529 nr_disconnect(sk, 0);
530 nr_destroy_socket(sk);
531 break;
532
533 case NR_STATE_3:
534 nr_clear_queues(sk);
535 nr->n2count = 0;
536 nr_write_internal(sk, NR_DISCREQ);
537 nr_start_t1timer(sk);
538 nr_stop_t2timer(sk);
539 nr_stop_t4timer(sk);
540 nr_stop_idletimer(sk);
541 nr->state = NR_STATE_2;
542 sk->sk_state = TCP_CLOSE;
543 sk->sk_shutdown |= SEND_SHUTDOWN;
544 sk->sk_state_change(sk);
545 sock_set_flag(sk, SOCK_DESTROY);
546 break;
547
548 default:
549 break;
550 }
551
552 sock->sk = NULL;
553 release_sock(sk);
554 sock_put(sk);
555
556 return 0;
557 }
558
559 static int nr_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
560 {
561 struct sock *sk = sock->sk;
562 struct nr_sock *nr = nr_sk(sk);
563 struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr;
564 struct net_device *dev;
565 ax25_uid_assoc *user;
566 ax25_address *source;
567
568 lock_sock(sk);
569 if (!sock_flag(sk, SOCK_ZAPPED)) {
570 release_sock(sk);
571 return -EINVAL;
572 }
573 if (addr_len < sizeof(struct sockaddr_ax25) || addr_len > sizeof(struct full_sockaddr_ax25)) {
574 release_sock(sk);
575 return -EINVAL;
576 }
577 if (addr_len < (addr->fsa_ax25.sax25_ndigis * sizeof(ax25_address) + sizeof(struct sockaddr_ax25))) {
578 release_sock(sk);
579 return -EINVAL;
580 }
581 if (addr->fsa_ax25.sax25_family != AF_NETROM) {
582 release_sock(sk);
583 return -EINVAL;
584 }
585 if ((dev = nr_dev_get(&addr->fsa_ax25.sax25_call)) == NULL) {
586 release_sock(sk);
587 return -EADDRNOTAVAIL;
588 }
589
590 /*
591 * Only the super user can set an arbitrary user callsign.
592 */
593 if (addr->fsa_ax25.sax25_ndigis == 1) {
594 if (!capable(CAP_NET_BIND_SERVICE)) {
595 dev_put(dev);
596 release_sock(sk);
597 return -EPERM;
598 }
599 nr->user_addr = addr->fsa_digipeater[0];
600 nr->source_addr = addr->fsa_ax25.sax25_call;
601 } else {
602 source = &addr->fsa_ax25.sax25_call;
603
604 user = ax25_findbyuid(current_euid());
605 if (user) {
606 nr->user_addr = user->call;
607 ax25_uid_put(user);
608 } else {
609 if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) {
610 release_sock(sk);
611 dev_put(dev);
612 return -EPERM;
613 }
614 nr->user_addr = *source;
615 }
616
617 nr->source_addr = *source;
618 }
619
620 nr->device = dev;
621 nr_insert_socket(sk);
622
623 sock_reset_flag(sk, SOCK_ZAPPED);
624 dev_put(dev);
625 release_sock(sk);
626
627 return 0;
628 }
629
630 static int nr_connect(struct socket *sock, struct sockaddr *uaddr,
631 int addr_len, int flags)
632 {
633 struct sock *sk = sock->sk;
634 struct nr_sock *nr = nr_sk(sk);
635 struct sockaddr_ax25 *addr = (struct sockaddr_ax25 *)uaddr;
636 ax25_address *source = NULL;
637 ax25_uid_assoc *user;
638 struct net_device *dev;
639 int err = 0;
640
641 lock_sock(sk);
642 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
643 sock->state = SS_CONNECTED;
644 goto out_release; /* Connect completed during a ERESTARTSYS event */
645 }
646
647 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
648 sock->state = SS_UNCONNECTED;
649 err = -ECONNREFUSED;
650 goto out_release;
651 }
652
653 if (sk->sk_state == TCP_ESTABLISHED) {
654 err = -EISCONN; /* No reconnect on a seqpacket socket */
655 goto out_release;
656 }
657
658 sk->sk_state = TCP_CLOSE;
659 sock->state = SS_UNCONNECTED;
660
661 if (addr_len != sizeof(struct sockaddr_ax25) && addr_len != sizeof(struct full_sockaddr_ax25)) {
662 err = -EINVAL;
663 goto out_release;
664 }
665 if (addr->sax25_family != AF_NETROM) {
666 err = -EINVAL;
667 goto out_release;
668 }
669 if (sock_flag(sk, SOCK_ZAPPED)) { /* Must bind first - autobinding in this may or may not work */
670 sock_reset_flag(sk, SOCK_ZAPPED);
671
672 if ((dev = nr_dev_first()) == NULL) {
673 err = -ENETUNREACH;
674 goto out_release;
675 }
676 source = (ax25_address *)dev->dev_addr;
677
678 user = ax25_findbyuid(current_euid());
679 if (user) {
680 nr->user_addr = user->call;
681 ax25_uid_put(user);
682 } else {
683 if (ax25_uid_policy && !capable(CAP_NET_ADMIN)) {
684 dev_put(dev);
685 err = -EPERM;
686 goto out_release;
687 }
688 nr->user_addr = *source;
689 }
690
691 nr->source_addr = *source;
692 nr->device = dev;
693
694 dev_put(dev);
695 nr_insert_socket(sk); /* Finish the bind */
696 }
697
698 nr->dest_addr = addr->sax25_call;
699
700 release_sock(sk);
701 circuit = nr_find_next_circuit();
702 lock_sock(sk);
703
704 nr->my_index = circuit / 256;
705 nr->my_id = circuit % 256;
706
707 circuit++;
708
709 /* Move to connecting socket, start sending Connect Requests */
710 sock->state = SS_CONNECTING;
711 sk->sk_state = TCP_SYN_SENT;
712
713 nr_establish_data_link(sk);
714
715 nr->state = NR_STATE_1;
716
717 nr_start_heartbeat(sk);
718
719 /* Now the loop */
720 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) {
721 err = -EINPROGRESS;
722 goto out_release;
723 }
724
725 /*
726 * A Connect Ack with Choke or timeout or failed routing will go to
727 * closed.
728 */
729 if (sk->sk_state == TCP_SYN_SENT) {
730 DEFINE_WAIT(wait);
731
732 for (;;) {
733 prepare_to_wait(sk_sleep(sk), &wait,
734 TASK_INTERRUPTIBLE);
735 if (sk->sk_state != TCP_SYN_SENT)
736 break;
737 if (!signal_pending(current)) {
738 release_sock(sk);
739 schedule();
740 lock_sock(sk);
741 continue;
742 }
743 err = -ERESTARTSYS;
744 break;
745 }
746 finish_wait(sk_sleep(sk), &wait);
747 if (err)
748 goto out_release;
749 }
750
751 if (sk->sk_state != TCP_ESTABLISHED) {
752 sock->state = SS_UNCONNECTED;
753 err = sock_error(sk); /* Always set at this point */
754 goto out_release;
755 }
756
757 sock->state = SS_CONNECTED;
758
759 out_release:
760 release_sock(sk);
761
762 return err;
763 }
764
765 static int nr_accept(struct socket *sock, struct socket *newsock, int flags,
766 bool kern)
767 {
768 struct sk_buff *skb;
769 struct sock *newsk;
770 DEFINE_WAIT(wait);
771 struct sock *sk;
772 int err = 0;
773
774 if ((sk = sock->sk) == NULL)
775 return -EINVAL;
776
777 lock_sock(sk);
778 if (sk->sk_type != SOCK_SEQPACKET) {
779 err = -EOPNOTSUPP;
780 goto out_release;
781 }
782
783 if (sk->sk_state != TCP_LISTEN) {
784 err = -EINVAL;
785 goto out_release;
786 }
787
788 /*
789 * The write queue this time is holding sockets ready to use
790 * hooked into the SABM we saved
791 */
792 for (;;) {
793 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
794 skb = skb_dequeue(&sk->sk_receive_queue);
795 if (skb)
796 break;
797
798 if (flags & O_NONBLOCK) {
799 err = -EWOULDBLOCK;
800 break;
801 }
802 if (!signal_pending(current)) {
803 release_sock(sk);
804 schedule();
805 lock_sock(sk);
806 continue;
807 }
808 err = -ERESTARTSYS;
809 break;
810 }
811 finish_wait(sk_sleep(sk), &wait);
812 if (err)
813 goto out_release;
814
815 newsk = skb->sk;
816 sock_graft(newsk, newsock);
817
818 /* Now attach up the new socket */
819 kfree_skb(skb);
820 sk_acceptq_removed(sk);
821
822 out_release:
823 release_sock(sk);
824
825 return err;
826 }
827
828 static int nr_getname(struct socket *sock, struct sockaddr *uaddr,
829 int peer)
830 {
831 struct full_sockaddr_ax25 *sax = (struct full_sockaddr_ax25 *)uaddr;
832 struct sock *sk = sock->sk;
833 struct nr_sock *nr = nr_sk(sk);
834 int uaddr_len;
835
836 memset(&sax->fsa_ax25, 0, sizeof(struct sockaddr_ax25));
837
838 lock_sock(sk);
839 if (peer != 0) {
840 if (sk->sk_state != TCP_ESTABLISHED) {
841 release_sock(sk);
842 return -ENOTCONN;
843 }
844 sax->fsa_ax25.sax25_family = AF_NETROM;
845 sax->fsa_ax25.sax25_ndigis = 1;
846 sax->fsa_ax25.sax25_call = nr->user_addr;
847 memset(sax->fsa_digipeater, 0, sizeof(sax->fsa_digipeater));
848 sax->fsa_digipeater[0] = nr->dest_addr;
849 uaddr_len = sizeof(struct full_sockaddr_ax25);
850 } else {
851 sax->fsa_ax25.sax25_family = AF_NETROM;
852 sax->fsa_ax25.sax25_ndigis = 0;
853 sax->fsa_ax25.sax25_call = nr->source_addr;
854 uaddr_len = sizeof(struct sockaddr_ax25);
855 }
856 release_sock(sk);
857
858 return uaddr_len;
859 }
860
861 int nr_rx_frame(struct sk_buff *skb, struct net_device *dev)
862 {
863 struct sock *sk;
864 struct sock *make;
865 struct nr_sock *nr_make;
866 ax25_address *src, *dest, *user;
867 unsigned short circuit_index, circuit_id;
868 unsigned short peer_circuit_index, peer_circuit_id;
869 unsigned short frametype, flags, window, timeout;
870 int ret;
871
872 skb->sk = NULL; /* Initially we don't know who it's for */
873
874 /*
875 * skb->data points to the netrom frame start
876 */
877
878 src = (ax25_address *)(skb->data + 0);
879 dest = (ax25_address *)(skb->data + 7);
880
881 circuit_index = skb->data[15];
882 circuit_id = skb->data[16];
883 peer_circuit_index = skb->data[17];
884 peer_circuit_id = skb->data[18];
885 frametype = skb->data[19] & 0x0F;
886 flags = skb->data[19] & 0xF0;
887
888 /*
889 * Check for an incoming IP over NET/ROM frame.
890 */
891 if (frametype == NR_PROTOEXT &&
892 circuit_index == NR_PROTO_IP && circuit_id == NR_PROTO_IP) {
893 skb_pull(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN);
894 skb_reset_transport_header(skb);
895
896 return nr_rx_ip(skb, dev);
897 }
898
899 /*
900 * Find an existing socket connection, based on circuit ID, if it's
901 * a Connect Request base it on their circuit ID.
902 *
903 * Circuit ID 0/0 is not valid but it could still be a "reset" for a
904 * circuit that no longer exists at the other end ...
905 */
906
907 sk = NULL;
908
909 if (circuit_index == 0 && circuit_id == 0) {
910 if (frametype == NR_CONNACK && flags == NR_CHOKE_FLAG)
911 sk = nr_find_peer(peer_circuit_index, peer_circuit_id, src);
912 } else {
913 if (frametype == NR_CONNREQ)
914 sk = nr_find_peer(circuit_index, circuit_id, src);
915 else
916 sk = nr_find_socket(circuit_index, circuit_id);
917 }
918
919 if (sk != NULL) {
920 bh_lock_sock(sk);
921 skb_reset_transport_header(skb);
922
923 if (frametype == NR_CONNACK && skb->len == 22)
924 nr_sk(sk)->bpqext = 1;
925 else
926 nr_sk(sk)->bpqext = 0;
927
928 ret = nr_process_rx_frame(sk, skb);
929 bh_unlock_sock(sk);
930 sock_put(sk);
931 return ret;
932 }
933
934 /*
935 * Now it should be a CONNREQ.
936 */
937 if (frametype != NR_CONNREQ) {
938 /*
939 * Here it would be nice to be able to send a reset but
940 * NET/ROM doesn't have one. We've tried to extend the protocol
941 * by sending NR_CONNACK | NR_CHOKE_FLAGS replies but that
942 * apparently kills BPQ boxes... :-(
943 * So now we try to follow the established behaviour of
944 * G8PZT's Xrouter which is sending packets with command type 7
945 * as an extension of the protocol.
946 */
947 if (sysctl_netrom_reset_circuit &&
948 (frametype != NR_RESET || flags != 0))
949 nr_transmit_reset(skb, 1);
950
951 return 0;
952 }
953
954 sk = nr_find_listener(dest);
955
956 user = (ax25_address *)(skb->data + 21);
957
958 if (sk == NULL || sk_acceptq_is_full(sk) ||
959 (make = nr_make_new(sk)) == NULL) {
960 nr_transmit_refusal(skb, 0);
961 if (sk)
962 sock_put(sk);
963 return 0;
964 }
965
966 bh_lock_sock(sk);
967
968 window = skb->data[20];
969
970 skb->sk = make;
971 make->sk_state = TCP_ESTABLISHED;
972
973 /* Fill in his circuit details */
974 nr_make = nr_sk(make);
975 nr_make->source_addr = *dest;
976 nr_make->dest_addr = *src;
977 nr_make->user_addr = *user;
978
979 nr_make->your_index = circuit_index;
980 nr_make->your_id = circuit_id;
981
982 bh_unlock_sock(sk);
983 circuit = nr_find_next_circuit();
984 bh_lock_sock(sk);
985
986 nr_make->my_index = circuit / 256;
987 nr_make->my_id = circuit % 256;
988
989 circuit++;
990
991 /* Window negotiation */
992 if (window < nr_make->window)
993 nr_make->window = window;
994
995 /* L4 timeout negotiation */
996 if (skb->len == 37) {
997 timeout = skb->data[36] * 256 + skb->data[35];
998 if (timeout * HZ < nr_make->t1)
999 nr_make->t1 = timeout * HZ;
1000 nr_make->bpqext = 1;
1001 } else {
1002 nr_make->bpqext = 0;
1003 }
1004
1005 nr_write_internal(make, NR_CONNACK);
1006
1007 nr_make->condition = 0x00;
1008 nr_make->vs = 0;
1009 nr_make->va = 0;
1010 nr_make->vr = 0;
1011 nr_make->vl = 0;
1012 nr_make->state = NR_STATE_3;
1013 sk_acceptq_added(sk);
1014 skb_queue_head(&sk->sk_receive_queue, skb);
1015
1016 if (!sock_flag(sk, SOCK_DEAD))
1017 sk->sk_data_ready(sk);
1018
1019 bh_unlock_sock(sk);
1020 sock_put(sk);
1021
1022 nr_insert_socket(make);
1023
1024 nr_start_heartbeat(make);
1025 nr_start_idletimer(make);
1026
1027 return 1;
1028 }
1029
1030 static int nr_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1031 {
1032 struct sock *sk = sock->sk;
1033 struct nr_sock *nr = nr_sk(sk);
1034 DECLARE_SOCKADDR(struct sockaddr_ax25 *, usax, msg->msg_name);
1035 int err;
1036 struct sockaddr_ax25 sax;
1037 struct sk_buff *skb;
1038 unsigned char *asmptr;
1039 int size;
1040
1041 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT))
1042 return -EINVAL;
1043
1044 lock_sock(sk);
1045 if (sock_flag(sk, SOCK_ZAPPED)) {
1046 err = -EADDRNOTAVAIL;
1047 goto out;
1048 }
1049
1050 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1051 send_sig(SIGPIPE, current, 0);
1052 err = -EPIPE;
1053 goto out;
1054 }
1055
1056 if (nr->device == NULL) {
1057 err = -ENETUNREACH;
1058 goto out;
1059 }
1060
1061 if (usax) {
1062 if (msg->msg_namelen < sizeof(sax)) {
1063 err = -EINVAL;
1064 goto out;
1065 }
1066 sax = *usax;
1067 if (ax25cmp(&nr->dest_addr, &sax.sax25_call) != 0) {
1068 err = -EISCONN;
1069 goto out;
1070 }
1071 if (sax.sax25_family != AF_NETROM) {
1072 err = -EINVAL;
1073 goto out;
1074 }
1075 } else {
1076 if (sk->sk_state != TCP_ESTABLISHED) {
1077 err = -ENOTCONN;
1078 goto out;
1079 }
1080 sax.sax25_family = AF_NETROM;
1081 sax.sax25_call = nr->dest_addr;
1082 }
1083
1084 /* Build a packet - the conventional user limit is 236 bytes. We can
1085 do ludicrously large NetROM frames but must not overflow */
1086 if (len > 65536) {
1087 err = -EMSGSIZE;
1088 goto out;
1089 }
1090
1091 size = len + NR_NETWORK_LEN + NR_TRANSPORT_LEN;
1092
1093 if ((skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL)
1094 goto out;
1095
1096 skb_reserve(skb, size - len);
1097 skb_reset_transport_header(skb);
1098
1099 /*
1100 * Push down the NET/ROM header
1101 */
1102
1103 asmptr = skb_push(skb, NR_TRANSPORT_LEN);
1104
1105 /* Build a NET/ROM Transport header */
1106
1107 *asmptr++ = nr->your_index;
1108 *asmptr++ = nr->your_id;
1109 *asmptr++ = 0; /* To be filled in later */
1110 *asmptr++ = 0; /* Ditto */
1111 *asmptr++ = NR_INFO;
1112
1113 /*
1114 * Put the data on the end
1115 */
1116 skb_put(skb, len);
1117
1118 /* User data follows immediately after the NET/ROM transport header */
1119 if (memcpy_from_msg(skb_transport_header(skb), msg, len)) {
1120 kfree_skb(skb);
1121 err = -EFAULT;
1122 goto out;
1123 }
1124
1125 if (sk->sk_state != TCP_ESTABLISHED) {
1126 kfree_skb(skb);
1127 err = -ENOTCONN;
1128 goto out;
1129 }
1130
1131 nr_output(sk, skb); /* Shove it onto the queue */
1132
1133 err = len;
1134 out:
1135 release_sock(sk);
1136 return err;
1137 }
1138
1139 static int nr_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1140 int flags)
1141 {
1142 struct sock *sk = sock->sk;
1143 DECLARE_SOCKADDR(struct sockaddr_ax25 *, sax, msg->msg_name);
1144 size_t copied;
1145 struct sk_buff *skb;
1146 int er;
1147
1148 /*
1149 * This works for seqpacket too. The receiver has ordered the queue for
1150 * us! We do one quick check first though
1151 */
1152
1153 lock_sock(sk);
1154 if (sk->sk_state != TCP_ESTABLISHED) {
1155 release_sock(sk);
1156 return -ENOTCONN;
1157 }
1158
1159 /* Now we can treat all alike */
1160 if ((skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, flags & MSG_DONTWAIT, &er)) == NULL) {
1161 release_sock(sk);
1162 return er;
1163 }
1164
1165 skb_reset_transport_header(skb);
1166 copied = skb->len;
1167
1168 if (copied > size) {
1169 copied = size;
1170 msg->msg_flags |= MSG_TRUNC;
1171 }
1172
1173 er = skb_copy_datagram_msg(skb, 0, msg, copied);
1174 if (er < 0) {
1175 skb_free_datagram(sk, skb);
1176 release_sock(sk);
1177 return er;
1178 }
1179
1180 if (sax != NULL) {
1181 memset(sax, 0, sizeof(*sax));
1182 sax->sax25_family = AF_NETROM;
1183 skb_copy_from_linear_data_offset(skb, 7, sax->sax25_call.ax25_call,
1184 AX25_ADDR_LEN);
1185 msg->msg_namelen = sizeof(*sax);
1186 }
1187
1188 skb_free_datagram(sk, skb);
1189
1190 release_sock(sk);
1191 return copied;
1192 }
1193
1194
1195 static int nr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1196 {
1197 struct sock *sk = sock->sk;
1198 void __user *argp = (void __user *)arg;
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 SIOCGIFADDR:
1225 case SIOCSIFADDR:
1226 case SIOCGIFDSTADDR:
1227 case SIOCSIFDSTADDR:
1228 case SIOCGIFBRDADDR:
1229 case SIOCSIFBRDADDR:
1230 case SIOCGIFNETMASK:
1231 case SIOCSIFNETMASK:
1232 case SIOCGIFMETRIC:
1233 case SIOCSIFMETRIC:
1234 return -EINVAL;
1235
1236 case SIOCADDRT:
1237 case SIOCDELRT:
1238 case SIOCNRDECOBS:
1239 if (!capable(CAP_NET_ADMIN))
1240 return -EPERM;
1241 return nr_rt_ioctl(cmd, argp);
1242
1243 default:
1244 return -ENOIOCTLCMD;
1245 }
1246
1247 return 0;
1248 }
1249
1250 #ifdef CONFIG_PROC_FS
1251
1252 static void *nr_info_start(struct seq_file *seq, loff_t *pos)
1253 {
1254 spin_lock_bh(&nr_list_lock);
1255 return seq_hlist_start_head(&nr_list, *pos);
1256 }
1257
1258 static void *nr_info_next(struct seq_file *seq, void *v, loff_t *pos)
1259 {
1260 return seq_hlist_next(v, &nr_list, pos);
1261 }
1262
1263 static void nr_info_stop(struct seq_file *seq, void *v)
1264 {
1265 spin_unlock_bh(&nr_list_lock);
1266 }
1267
1268 static int nr_info_show(struct seq_file *seq, void *v)
1269 {
1270 struct sock *s = sk_entry(v);
1271 struct net_device *dev;
1272 struct nr_sock *nr;
1273 const char *devname;
1274 char buf[11];
1275
1276 if (v == SEQ_START_TOKEN)
1277 seq_puts(seq,
1278 "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");
1279
1280 else {
1281
1282 bh_lock_sock(s);
1283 nr = nr_sk(s);
1284
1285 if ((dev = nr->device) == NULL)
1286 devname = "???";
1287 else
1288 devname = dev->name;
1289
1290 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->user_addr));
1291 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->dest_addr));
1292 seq_printf(seq,
1293 "%-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",
1294 ax2asc(buf, &nr->source_addr),
1295 devname,
1296 nr->my_index,
1297 nr->my_id,
1298 nr->your_index,
1299 nr->your_id,
1300 nr->state,
1301 nr->vs,
1302 nr->vr,
1303 nr->va,
1304 ax25_display_timer(&nr->t1timer) / HZ,
1305 nr->t1 / HZ,
1306 ax25_display_timer(&nr->t2timer) / HZ,
1307 nr->t2 / HZ,
1308 ax25_display_timer(&nr->t4timer) / HZ,
1309 nr->t4 / HZ,
1310 ax25_display_timer(&nr->idletimer) / (60 * HZ),
1311 nr->idle / (60 * HZ),
1312 nr->n2count,
1313 nr->n2,
1314 nr->window,
1315 sk_wmem_alloc_get(s),
1316 sk_rmem_alloc_get(s),
1317 s->sk_socket ? SOCK_INODE(s->sk_socket)->i_ino : 0L);
1318
1319 bh_unlock_sock(s);
1320 }
1321 return 0;
1322 }
1323
1324 static const struct seq_operations nr_info_seqops = {
1325 .start = nr_info_start,
1326 .next = nr_info_next,
1327 .stop = nr_info_stop,
1328 .show = nr_info_show,
1329 };
1330 #endif /* CONFIG_PROC_FS */
1331
1332 static const struct net_proto_family nr_family_ops = {
1333 .family = PF_NETROM,
1334 .create = nr_create,
1335 .owner = THIS_MODULE,
1336 };
1337
1338 static const struct proto_ops nr_proto_ops = {
1339 .family = PF_NETROM,
1340 .owner = THIS_MODULE,
1341 .release = nr_release,
1342 .bind = nr_bind,
1343 .connect = nr_connect,
1344 .socketpair = sock_no_socketpair,
1345 .accept = nr_accept,
1346 .getname = nr_getname,
1347 .poll = datagram_poll,
1348 .ioctl = nr_ioctl,
1349 .gettstamp = sock_gettstamp,
1350 .listen = nr_listen,
1351 .shutdown = sock_no_shutdown,
1352 .setsockopt = nr_setsockopt,
1353 .getsockopt = nr_getsockopt,
1354 .sendmsg = nr_sendmsg,
1355 .recvmsg = nr_recvmsg,
1356 .mmap = sock_no_mmap,
1357 .sendpage = sock_no_sendpage,
1358 };
1359
1360 static struct notifier_block nr_dev_notifier = {
1361 .notifier_call = nr_device_event,
1362 };
1363
1364 static struct net_device **dev_nr;
1365
1366 static struct ax25_protocol nr_pid = {
1367 .pid = AX25_P_NETROM,
1368 .func = nr_route_frame
1369 };
1370
1371 static struct ax25_linkfail nr_linkfail_notifier = {
1372 .func = nr_link_failed,
1373 };
1374
1375 static int __init nr_proto_init(void)
1376 {
1377 int i;
1378 int rc = proto_register(&nr_proto, 0);
1379
1380 if (rc)
1381 return rc;
1382
1383 if (nr_ndevs > 0x7fffffff/sizeof(struct net_device *)) {
1384 pr_err("NET/ROM: %s - nr_ndevs parameter too large\n",
1385 __func__);
1386 rc = -EINVAL;
1387 goto unregister_proto;
1388 }
1389
1390 dev_nr = kcalloc(nr_ndevs, sizeof(struct net_device *), GFP_KERNEL);
1391 if (!dev_nr) {
1392 pr_err("NET/ROM: %s - unable to allocate device array\n",
1393 __func__);
1394 rc = -ENOMEM;
1395 goto unregister_proto;
1396 }
1397
1398 for (i = 0; i < nr_ndevs; i++) {
1399 char name[IFNAMSIZ];
1400 struct net_device *dev;
1401
1402 sprintf(name, "nr%d", i);
1403 dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, nr_setup);
1404 if (!dev) {
1405 rc = -ENOMEM;
1406 goto fail;
1407 }
1408
1409 dev->base_addr = i;
1410 rc = register_netdev(dev);
1411 if (rc) {
1412 free_netdev(dev);
1413 goto fail;
1414 }
1415 nr_set_lockdep_key(dev);
1416 dev_nr[i] = dev;
1417 }
1418
1419 rc = sock_register(&nr_family_ops);
1420 if (rc)
1421 goto fail;
1422
1423 rc = register_netdevice_notifier(&nr_dev_notifier);
1424 if (rc)
1425 goto out_sock;
1426
1427 ax25_register_pid(&nr_pid);
1428 ax25_linkfail_register(&nr_linkfail_notifier);
1429
1430 #ifdef CONFIG_SYSCTL
1431 rc = nr_register_sysctl();
1432 if (rc)
1433 goto out_sysctl;
1434 #endif
1435
1436 nr_loopback_init();
1437
1438 rc = -ENOMEM;
1439 if (!proc_create_seq("nr", 0444, init_net.proc_net, &nr_info_seqops))
1440 goto proc_remove1;
1441 if (!proc_create_seq("nr_neigh", 0444, init_net.proc_net,
1442 &nr_neigh_seqops))
1443 goto proc_remove2;
1444 if (!proc_create_seq("nr_nodes", 0444, init_net.proc_net,
1445 &nr_node_seqops))
1446 goto proc_remove3;
1447
1448 return 0;
1449
1450 proc_remove3:
1451 remove_proc_entry("nr_neigh", init_net.proc_net);
1452 proc_remove2:
1453 remove_proc_entry("nr", init_net.proc_net);
1454 proc_remove1:
1455
1456 nr_loopback_clear();
1457 nr_rt_free();
1458
1459 #ifdef CONFIG_SYSCTL
1460 nr_unregister_sysctl();
1461 out_sysctl:
1462 #endif
1463 ax25_linkfail_release(&nr_linkfail_notifier);
1464 ax25_protocol_release(AX25_P_NETROM);
1465 unregister_netdevice_notifier(&nr_dev_notifier);
1466 out_sock:
1467 sock_unregister(PF_NETROM);
1468 fail:
1469 while (--i >= 0) {
1470 unregister_netdev(dev_nr[i]);
1471 free_netdev(dev_nr[i]);
1472 }
1473 kfree(dev_nr);
1474 unregister_proto:
1475 proto_unregister(&nr_proto);
1476 return rc;
1477 }
1478
1479 module_init(nr_proto_init);
1480
1481 module_param(nr_ndevs, int, 0);
1482 MODULE_PARM_DESC(nr_ndevs, "number of NET/ROM devices");
1483
1484 MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>");
1485 MODULE_DESCRIPTION("The amateur radio NET/ROM network and transport layer protocol");
1486 MODULE_LICENSE("GPL");
1487 MODULE_ALIAS_NETPROTO(PF_NETROM);
1488
1489 static void __exit nr_exit(void)
1490 {
1491 int i;
1492
1493 remove_proc_entry("nr", init_net.proc_net);
1494 remove_proc_entry("nr_neigh", init_net.proc_net);
1495 remove_proc_entry("nr_nodes", init_net.proc_net);
1496 nr_loopback_clear();
1497
1498 nr_rt_free();
1499
1500 #ifdef CONFIG_SYSCTL
1501 nr_unregister_sysctl();
1502 #endif
1503
1504 ax25_linkfail_release(&nr_linkfail_notifier);
1505 ax25_protocol_release(AX25_P_NETROM);
1506
1507 unregister_netdevice_notifier(&nr_dev_notifier);
1508
1509 sock_unregister(PF_NETROM);
1510
1511 for (i = 0; i < nr_ndevs; i++) {
1512 struct net_device *dev = dev_nr[i];
1513 if (dev) {
1514 unregister_netdev(dev);
1515 free_netdev(dev);
1516 }
1517 }
1518
1519 kfree(dev_nr);
1520 proto_unregister(&nr_proto);
1521 }
1522 module_exit(nr_exit);
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