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 * Socket removal during an interrupt is now safe.
68 */
nr_remove_socket(struct sock * sk)69 static void nr_remove_socket(struct sock *sk)
70 {
71 spin_lock_bh(&nr_list_lock);
72 sk_del_node_init(sk);
73 spin_unlock_bh(&nr_list_lock);
74 }
75
76 /*
77 * Kill all bound sockets on a dropped device.
78 */
nr_kill_by_device(struct net_device * dev)79 static void nr_kill_by_device(struct net_device *dev)
80 {
81 struct sock *s;
82
83 spin_lock_bh(&nr_list_lock);
84 sk_for_each(s, &nr_list)
85 if (nr_sk(s)->device == dev)
86 nr_disconnect(s, ENETUNREACH);
87 spin_unlock_bh(&nr_list_lock);
88 }
89
90 /*
91 * Handle device status changes.
92 */
nr_device_event(struct notifier_block * this,unsigned long event,void * ptr)93 static int nr_device_event(struct notifier_block *this, unsigned long event, void *ptr)
94 {
95 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
96
97 if (!net_eq(dev_net(dev), &init_net))
98 return NOTIFY_DONE;
99
100 if (event != NETDEV_DOWN)
101 return NOTIFY_DONE;
102
103 nr_kill_by_device(dev);
104 nr_rt_device_down(dev);
105
106 return NOTIFY_DONE;
107 }
108
109 /*
110 * Add a socket to the bound sockets list.
111 */
nr_insert_socket(struct sock * sk)112 static void nr_insert_socket(struct sock *sk)
113 {
114 spin_lock_bh(&nr_list_lock);
115 sk_add_node(sk, &nr_list);
116 spin_unlock_bh(&nr_list_lock);
117 }
118
119 /*
120 * Find a socket that wants to accept the Connect Request we just
121 * received.
122 */
nr_find_listener(ax25_address * addr)123 static struct sock *nr_find_listener(ax25_address *addr)
124 {
125 struct sock *s;
126
127 spin_lock_bh(&nr_list_lock);
128 sk_for_each(s, &nr_list)
129 if (!ax25cmp(&nr_sk(s)->source_addr, addr) &&
130 s->sk_state == TCP_LISTEN) {
131 sock_hold(s);
132 goto found;
133 }
134 s = NULL;
135 found:
136 spin_unlock_bh(&nr_list_lock);
137 return s;
138 }
139
140 /*
141 * Find a connected NET/ROM socket given my circuit IDs.
142 */
nr_find_socket(unsigned char index,unsigned char id)143 static struct sock *nr_find_socket(unsigned char index, unsigned char id)
144 {
145 struct sock *s;
146
147 spin_lock_bh(&nr_list_lock);
148 sk_for_each(s, &nr_list) {
149 struct nr_sock *nr = nr_sk(s);
150
151 if (nr->my_index == index && nr->my_id == id) {
152 sock_hold(s);
153 goto found;
154 }
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 their circuit IDs.
164 */
nr_find_peer(unsigned char index,unsigned char id,ax25_address * dest)165 static struct sock *nr_find_peer(unsigned char index, unsigned char id,
166 ax25_address *dest)
167 {
168 struct sock *s;
169
170 spin_lock_bh(&nr_list_lock);
171 sk_for_each(s, &nr_list) {
172 struct nr_sock *nr = nr_sk(s);
173
174 if (nr->your_index == index && nr->your_id == id &&
175 !ax25cmp(&nr->dest_addr, dest)) {
176 sock_hold(s);
177 goto found;
178 }
179 }
180 s = NULL;
181 found:
182 spin_unlock_bh(&nr_list_lock);
183 return s;
184 }
185
186 /*
187 * Find next free circuit ID.
188 */
nr_find_next_circuit(void)189 static unsigned short nr_find_next_circuit(void)
190 {
191 unsigned short id = circuit;
192 unsigned char i, j;
193 struct sock *sk;
194
195 for (;;) {
196 i = id / 256;
197 j = id % 256;
198
199 if (i != 0 && j != 0) {
200 if ((sk=nr_find_socket(i, j)) == NULL)
201 break;
202 sock_put(sk);
203 }
204
205 id++;
206 }
207
208 return id;
209 }
210
211 /*
212 * Deferred destroy.
213 */
214 void nr_destroy_socket(struct sock *);
215
216 /*
217 * Handler for deferred kills.
218 */
nr_destroy_timer(struct timer_list * t)219 static void nr_destroy_timer(struct timer_list *t)
220 {
221 struct sock *sk = from_timer(sk, t, sk_timer);
222 bh_lock_sock(sk);
223 sock_hold(sk);
224 nr_destroy_socket(sk);
225 bh_unlock_sock(sk);
226 sock_put(sk);
227 }
228
229 /*
230 * This is called from user mode and the timers. Thus it protects itself
231 * against interrupt users but doesn't worry about being called during
232 * work. Once it is removed from the queue no interrupt or bottom half
233 * will touch it and we are (fairly 8-) ) safe.
234 */
nr_destroy_socket(struct sock * sk)235 void nr_destroy_socket(struct sock *sk)
236 {
237 struct sk_buff *skb;
238
239 nr_remove_socket(sk);
240
241 nr_stop_heartbeat(sk);
242 nr_stop_t1timer(sk);
243 nr_stop_t2timer(sk);
244 nr_stop_t4timer(sk);
245 nr_stop_idletimer(sk);
246
247 nr_clear_queues(sk); /* Flush the queues */
248
249 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
250 if (skb->sk != sk) { /* A pending connection */
251 /* Queue the unaccepted socket for death */
252 sock_set_flag(skb->sk, SOCK_DEAD);
253 nr_start_heartbeat(skb->sk);
254 nr_sk(skb->sk)->state = NR_STATE_0;
255 }
256
257 kfree_skb(skb);
258 }
259
260 if (sk_has_allocations(sk)) {
261 /* Defer: outstanding buffers */
262 sk->sk_timer.function = nr_destroy_timer;
263 sk->sk_timer.expires = jiffies + 2 * HZ;
264 add_timer(&sk->sk_timer);
265 } else
266 sock_put(sk);
267 }
268
269 /*
270 * Handling for system calls applied via the various interfaces to a
271 * NET/ROM socket object.
272 */
273
nr_setsockopt(struct socket * sock,int level,int optname,char __user * optval,unsigned int optlen)274 static int nr_setsockopt(struct socket *sock, int level, int optname,
275 char __user *optval, unsigned int optlen)
276 {
277 struct sock *sk = sock->sk;
278 struct nr_sock *nr = nr_sk(sk);
279 unsigned long opt;
280
281 if (level != SOL_NETROM)
282 return -ENOPROTOOPT;
283
284 if (optlen < sizeof(unsigned int))
285 return -EINVAL;
286
287 if (get_user(opt, (unsigned int __user *)optval))
288 return -EFAULT;
289
290 switch (optname) {
291 case NETROM_T1:
292 if (opt < 1 || opt > ULONG_MAX / HZ)
293 return -EINVAL;
294 nr->t1 = opt * HZ;
295 return 0;
296
297 case NETROM_T2:
298 if (opt < 1 || opt > ULONG_MAX / HZ)
299 return -EINVAL;
300 nr->t2 = opt * HZ;
301 return 0;
302
303 case NETROM_N2:
304 if (opt < 1 || opt > 31)
305 return -EINVAL;
306 nr->n2 = opt;
307 return 0;
308
309 case NETROM_T4:
310 if (opt < 1 || opt > ULONG_MAX / HZ)
311 return -EINVAL;
312 nr->t4 = opt * HZ;
313 return 0;
314
315 case NETROM_IDLE:
316 if (opt > ULONG_MAX / (60 * HZ))
317 return -EINVAL;
318 nr->idle = opt * 60 * HZ;
319 return 0;
320
321 default:
322 return -ENOPROTOOPT;
323 }
324 }
325
nr_getsockopt(struct socket * sock,int level,int optname,char __user * optval,int __user * optlen)326 static int nr_getsockopt(struct socket *sock, int level, int optname,
327 char __user *optval, int __user *optlen)
328 {
329 struct sock *sk = sock->sk;
330 struct nr_sock *nr = nr_sk(sk);
331 int val = 0;
332 int len;
333
334 if (level != SOL_NETROM)
335 return -ENOPROTOOPT;
336
337 if (get_user(len, optlen))
338 return -EFAULT;
339
340 if (len < 0)
341 return -EINVAL;
342
343 switch (optname) {
344 case NETROM_T1:
345 val = nr->t1 / HZ;
346 break;
347
348 case NETROM_T2:
349 val = nr->t2 / HZ;
350 break;
351
352 case NETROM_N2:
353 val = nr->n2;
354 break;
355
356 case NETROM_T4:
357 val = nr->t4 / HZ;
358 break;
359
360 case NETROM_IDLE:
361 val = nr->idle / (60 * HZ);
362 break;
363
364 default:
365 return -ENOPROTOOPT;
366 }
367
368 len = min_t(unsigned int, len, sizeof(int));
369
370 if (put_user(len, optlen))
371 return -EFAULT;
372
373 return copy_to_user(optval, &val, len) ? -EFAULT : 0;
374 }
375
nr_listen(struct socket * sock,int backlog)376 static int nr_listen(struct socket *sock, int backlog)
377 {
378 struct sock *sk = sock->sk;
379
380 lock_sock(sk);
381 if (sock->state != SS_UNCONNECTED) {
382 release_sock(sk);
383 return -EINVAL;
384 }
385
386 if (sk->sk_state != TCP_LISTEN) {
387 memset(&nr_sk(sk)->user_addr, 0, AX25_ADDR_LEN);
388 sk->sk_max_ack_backlog = backlog;
389 sk->sk_state = TCP_LISTEN;
390 release_sock(sk);
391 return 0;
392 }
393 release_sock(sk);
394
395 return -EOPNOTSUPP;
396 }
397
398 static struct proto nr_proto = {
399 .name = "NETROM",
400 .owner = THIS_MODULE,
401 .obj_size = sizeof(struct nr_sock),
402 };
403
nr_create(struct net * net,struct socket * sock,int protocol,int kern)404 static int nr_create(struct net *net, struct socket *sock, int protocol,
405 int kern)
406 {
407 struct sock *sk;
408 struct nr_sock *nr;
409
410 if (!net_eq(net, &init_net))
411 return -EAFNOSUPPORT;
412
413 if (sock->type != SOCK_SEQPACKET || protocol != 0)
414 return -ESOCKTNOSUPPORT;
415
416 sk = sk_alloc(net, PF_NETROM, GFP_ATOMIC, &nr_proto, kern);
417 if (sk == NULL)
418 return -ENOMEM;
419
420 nr = nr_sk(sk);
421
422 sock_init_data(sock, sk);
423
424 sock->ops = &nr_proto_ops;
425 sk->sk_protocol = protocol;
426
427 skb_queue_head_init(&nr->ack_queue);
428 skb_queue_head_init(&nr->reseq_queue);
429 skb_queue_head_init(&nr->frag_queue);
430
431 nr_init_timers(sk);
432
433 nr->t1 =
434 msecs_to_jiffies(READ_ONCE(sysctl_netrom_transport_timeout));
435 nr->t2 =
436 msecs_to_jiffies(READ_ONCE(sysctl_netrom_transport_acknowledge_delay));
437 nr->n2 =
438 msecs_to_jiffies(READ_ONCE(sysctl_netrom_transport_maximum_tries));
439 nr->t4 =
440 msecs_to_jiffies(READ_ONCE(sysctl_netrom_transport_busy_delay));
441 nr->idle =
442 msecs_to_jiffies(READ_ONCE(sysctl_netrom_transport_no_activity_timeout));
443 nr->window = READ_ONCE(sysctl_netrom_transport_requested_window_size);
444
445 nr->bpqext = 1;
446 nr->state = NR_STATE_0;
447
448 return 0;
449 }
450
nr_make_new(struct sock * osk)451 static struct sock *nr_make_new(struct sock *osk)
452 {
453 struct sock *sk;
454 struct nr_sock *nr, *onr;
455
456 if (osk->sk_type != SOCK_SEQPACKET)
457 return NULL;
458
459 sk = sk_alloc(sock_net(osk), PF_NETROM, GFP_ATOMIC, osk->sk_prot, 0);
460 if (sk == NULL)
461 return NULL;
462
463 nr = nr_sk(sk);
464
465 sock_init_data(NULL, sk);
466
467 sk->sk_type = osk->sk_type;
468 sk->sk_priority = osk->sk_priority;
469 sk->sk_protocol = osk->sk_protocol;
470 sk->sk_rcvbuf = osk->sk_rcvbuf;
471 sk->sk_sndbuf = osk->sk_sndbuf;
472 sk->sk_state = TCP_ESTABLISHED;
473 sock_copy_flags(sk, osk);
474
475 skb_queue_head_init(&nr->ack_queue);
476 skb_queue_head_init(&nr->reseq_queue);
477 skb_queue_head_init(&nr->frag_queue);
478
479 nr_init_timers(sk);
480
481 onr = nr_sk(osk);
482
483 nr->t1 = onr->t1;
484 nr->t2 = onr->t2;
485 nr->n2 = onr->n2;
486 nr->t4 = onr->t4;
487 nr->idle = onr->idle;
488 nr->window = onr->window;
489
490 nr->device = onr->device;
491 nr->bpqext = onr->bpqext;
492
493 return sk;
494 }
495
nr_release(struct socket * sock)496 static int nr_release(struct socket *sock)
497 {
498 struct sock *sk = sock->sk;
499 struct nr_sock *nr;
500
501 if (sk == NULL) return 0;
502
503 sock_hold(sk);
504 sock_orphan(sk);
505 lock_sock(sk);
506 nr = nr_sk(sk);
507
508 switch (nr->state) {
509 case NR_STATE_0:
510 case NR_STATE_1:
511 case NR_STATE_2:
512 nr_disconnect(sk, 0);
513 nr_destroy_socket(sk);
514 break;
515
516 case NR_STATE_3:
517 nr_clear_queues(sk);
518 nr->n2count = 0;
519 nr_write_internal(sk, NR_DISCREQ);
520 nr_start_t1timer(sk);
521 nr_stop_t2timer(sk);
522 nr_stop_t4timer(sk);
523 nr_stop_idletimer(sk);
524 nr->state = NR_STATE_2;
525 sk->sk_state = TCP_CLOSE;
526 sk->sk_shutdown |= SEND_SHUTDOWN;
527 sk->sk_state_change(sk);
528 sock_set_flag(sk, SOCK_DESTROY);
529 break;
530
531 default:
532 break;
533 }
534
535 sock->sk = NULL;
536 release_sock(sk);
537 sock_put(sk);
538
539 return 0;
540 }
541
nr_bind(struct socket * sock,struct sockaddr * uaddr,int addr_len)542 static int nr_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
543 {
544 struct sock *sk = sock->sk;
545 struct nr_sock *nr = nr_sk(sk);
546 struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr;
547 struct net_device *dev;
548 ax25_uid_assoc *user;
549 ax25_address *source;
550
551 lock_sock(sk);
552 if (!sock_flag(sk, SOCK_ZAPPED)) {
553 release_sock(sk);
554 return -EINVAL;
555 }
556 if (addr_len < sizeof(struct sockaddr_ax25) || addr_len > sizeof(struct full_sockaddr_ax25)) {
557 release_sock(sk);
558 return -EINVAL;
559 }
560 if (addr_len < (addr->fsa_ax25.sax25_ndigis * sizeof(ax25_address) + sizeof(struct sockaddr_ax25))) {
561 release_sock(sk);
562 return -EINVAL;
563 }
564 if (addr->fsa_ax25.sax25_family != AF_NETROM) {
565 release_sock(sk);
566 return -EINVAL;
567 }
568 if ((dev = nr_dev_get(&addr->fsa_ax25.sax25_call)) == NULL) {
569 release_sock(sk);
570 return -EADDRNOTAVAIL;
571 }
572
573 /*
574 * Only the super user can set an arbitrary user callsign.
575 */
576 if (addr->fsa_ax25.sax25_ndigis == 1) {
577 if (!capable(CAP_NET_BIND_SERVICE)) {
578 dev_put(dev);
579 release_sock(sk);
580 return -EPERM;
581 }
582 nr->user_addr = addr->fsa_digipeater[0];
583 nr->source_addr = addr->fsa_ax25.sax25_call;
584 } else {
585 source = &addr->fsa_ax25.sax25_call;
586
587 user = ax25_findbyuid(current_euid());
588 if (user) {
589 nr->user_addr = user->call;
590 ax25_uid_put(user);
591 } else {
592 if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) {
593 release_sock(sk);
594 dev_put(dev);
595 return -EPERM;
596 }
597 nr->user_addr = *source;
598 }
599
600 nr->source_addr = *source;
601 }
602
603 nr->device = dev;
604 nr_insert_socket(sk);
605
606 sock_reset_flag(sk, SOCK_ZAPPED);
607 dev_put(dev);
608 release_sock(sk);
609
610 return 0;
611 }
612
nr_connect(struct socket * sock,struct sockaddr * uaddr,int addr_len,int flags)613 static int nr_connect(struct socket *sock, struct sockaddr *uaddr,
614 int addr_len, int flags)
615 {
616 struct sock *sk = sock->sk;
617 struct nr_sock *nr = nr_sk(sk);
618 struct sockaddr_ax25 *addr = (struct sockaddr_ax25 *)uaddr;
619 ax25_address *source = NULL;
620 ax25_uid_assoc *user;
621 struct net_device *dev;
622 int err = 0;
623
624 lock_sock(sk);
625 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
626 sock->state = SS_CONNECTED;
627 goto out_release; /* Connect completed during a ERESTARTSYS event */
628 }
629
630 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
631 sock->state = SS_UNCONNECTED;
632 err = -ECONNREFUSED;
633 goto out_release;
634 }
635
636 if (sk->sk_state == TCP_ESTABLISHED) {
637 err = -EISCONN; /* No reconnect on a seqpacket socket */
638 goto out_release;
639 }
640
641 if (sock->state == SS_CONNECTING) {
642 err = -EALREADY;
643 goto out_release;
644 }
645
646 sk->sk_state = TCP_CLOSE;
647 sock->state = SS_UNCONNECTED;
648
649 if (addr_len != sizeof(struct sockaddr_ax25) && addr_len != sizeof(struct full_sockaddr_ax25)) {
650 err = -EINVAL;
651 goto out_release;
652 }
653 if (addr->sax25_family != AF_NETROM) {
654 err = -EINVAL;
655 goto out_release;
656 }
657 if (sock_flag(sk, SOCK_ZAPPED)) { /* Must bind first - autobinding in this may or may not work */
658 sock_reset_flag(sk, SOCK_ZAPPED);
659
660 if ((dev = nr_dev_first()) == NULL) {
661 err = -ENETUNREACH;
662 goto out_release;
663 }
664 source = (ax25_address *)dev->dev_addr;
665
666 user = ax25_findbyuid(current_euid());
667 if (user) {
668 nr->user_addr = user->call;
669 ax25_uid_put(user);
670 } else {
671 if (ax25_uid_policy && !capable(CAP_NET_ADMIN)) {
672 dev_put(dev);
673 err = -EPERM;
674 goto out_release;
675 }
676 nr->user_addr = *source;
677 }
678
679 nr->source_addr = *source;
680 nr->device = dev;
681
682 dev_put(dev);
683 nr_insert_socket(sk); /* Finish the bind */
684 }
685
686 nr->dest_addr = addr->sax25_call;
687
688 release_sock(sk);
689 circuit = nr_find_next_circuit();
690 lock_sock(sk);
691
692 nr->my_index = circuit / 256;
693 nr->my_id = circuit % 256;
694
695 circuit++;
696
697 /* Move to connecting socket, start sending Connect Requests */
698 sock->state = SS_CONNECTING;
699 sk->sk_state = TCP_SYN_SENT;
700
701 nr_establish_data_link(sk);
702
703 nr->state = NR_STATE_1;
704
705 nr_start_heartbeat(sk);
706
707 /* Now the loop */
708 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) {
709 err = -EINPROGRESS;
710 goto out_release;
711 }
712
713 /*
714 * A Connect Ack with Choke or timeout or failed routing will go to
715 * closed.
716 */
717 if (sk->sk_state == TCP_SYN_SENT) {
718 DEFINE_WAIT(wait);
719
720 for (;;) {
721 prepare_to_wait(sk_sleep(sk), &wait,
722 TASK_INTERRUPTIBLE);
723 if (sk->sk_state != TCP_SYN_SENT)
724 break;
725 if (!signal_pending(current)) {
726 release_sock(sk);
727 schedule();
728 lock_sock(sk);
729 continue;
730 }
731 err = -ERESTARTSYS;
732 break;
733 }
734 finish_wait(sk_sleep(sk), &wait);
735 if (err)
736 goto out_release;
737 }
738
739 if (sk->sk_state != TCP_ESTABLISHED) {
740 sock->state = SS_UNCONNECTED;
741 err = sock_error(sk); /* Always set at this point */
742 goto out_release;
743 }
744
745 sock->state = SS_CONNECTED;
746
747 out_release:
748 release_sock(sk);
749
750 return err;
751 }
752
nr_accept(struct socket * sock,struct socket * newsock,int flags,bool kern)753 static int nr_accept(struct socket *sock, struct socket *newsock, int flags,
754 bool kern)
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_sleep(sk), &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_sleep(sk), &wait);
800 if (err)
801 goto out_release;
802
803 newsk = skb->sk;
804 sock_graft(newsk, newsock);
805
806 /* Now attach up the new socket */
807 kfree_skb(skb);
808 sk_acceptq_removed(sk);
809
810 out_release:
811 release_sock(sk);
812
813 return err;
814 }
815
nr_getname(struct socket * sock,struct sockaddr * uaddr,int peer)816 static int nr_getname(struct socket *sock, struct sockaddr *uaddr,
817 int peer)
818 {
819 struct full_sockaddr_ax25 *sax = (struct full_sockaddr_ax25 *)uaddr;
820 struct sock *sk = sock->sk;
821 struct nr_sock *nr = nr_sk(sk);
822 int uaddr_len;
823
824 memset(&sax->fsa_ax25, 0, sizeof(struct sockaddr_ax25));
825
826 lock_sock(sk);
827 if (peer != 0) {
828 if (sk->sk_state != TCP_ESTABLISHED) {
829 release_sock(sk);
830 return -ENOTCONN;
831 }
832 sax->fsa_ax25.sax25_family = AF_NETROM;
833 sax->fsa_ax25.sax25_ndigis = 1;
834 sax->fsa_ax25.sax25_call = nr->user_addr;
835 memset(sax->fsa_digipeater, 0, sizeof(sax->fsa_digipeater));
836 sax->fsa_digipeater[0] = nr->dest_addr;
837 uaddr_len = sizeof(struct full_sockaddr_ax25);
838 } else {
839 sax->fsa_ax25.sax25_family = AF_NETROM;
840 sax->fsa_ax25.sax25_ndigis = 0;
841 sax->fsa_ax25.sax25_call = nr->source_addr;
842 uaddr_len = sizeof(struct sockaddr_ax25);
843 }
844 release_sock(sk);
845
846 return uaddr_len;
847 }
848
nr_rx_frame(struct sk_buff * skb,struct net_device * dev)849 int nr_rx_frame(struct sk_buff *skb, struct net_device *dev)
850 {
851 struct sock *sk;
852 struct sock *make;
853 struct nr_sock *nr_make;
854 ax25_address *src, *dest, *user;
855 unsigned short circuit_index, circuit_id;
856 unsigned short peer_circuit_index, peer_circuit_id;
857 unsigned short frametype, flags, window, timeout;
858 int ret;
859
860 skb_orphan(skb);
861
862 /*
863 * skb->data points to the netrom frame start
864 */
865
866 src = (ax25_address *)(skb->data + 0);
867 dest = (ax25_address *)(skb->data + 7);
868
869 circuit_index = skb->data[15];
870 circuit_id = skb->data[16];
871 peer_circuit_index = skb->data[17];
872 peer_circuit_id = skb->data[18];
873 frametype = skb->data[19] & 0x0F;
874 flags = skb->data[19] & 0xF0;
875
876 /*
877 * Check for an incoming IP over NET/ROM frame.
878 */
879 if (frametype == NR_PROTOEXT &&
880 circuit_index == NR_PROTO_IP && circuit_id == NR_PROTO_IP) {
881 skb_pull(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN);
882 skb_reset_transport_header(skb);
883
884 return nr_rx_ip(skb, dev);
885 }
886
887 /*
888 * Find an existing socket connection, based on circuit ID, if it's
889 * a Connect Request base it on their circuit ID.
890 *
891 * Circuit ID 0/0 is not valid but it could still be a "reset" for a
892 * circuit that no longer exists at the other end ...
893 */
894
895 sk = NULL;
896
897 if (circuit_index == 0 && circuit_id == 0) {
898 if (frametype == NR_CONNACK && flags == NR_CHOKE_FLAG)
899 sk = nr_find_peer(peer_circuit_index, peer_circuit_id, src);
900 } else {
901 if (frametype == NR_CONNREQ)
902 sk = nr_find_peer(circuit_index, circuit_id, src);
903 else
904 sk = nr_find_socket(circuit_index, circuit_id);
905 }
906
907 if (sk != NULL) {
908 bh_lock_sock(sk);
909 skb_reset_transport_header(skb);
910
911 if (frametype == NR_CONNACK && skb->len == 22)
912 nr_sk(sk)->bpqext = 1;
913 else
914 nr_sk(sk)->bpqext = 0;
915
916 ret = nr_process_rx_frame(sk, skb);
917 bh_unlock_sock(sk);
918 sock_put(sk);
919 return ret;
920 }
921
922 /*
923 * Now it should be a CONNREQ.
924 */
925 if (frametype != NR_CONNREQ) {
926 /*
927 * Here it would be nice to be able to send a reset but
928 * NET/ROM doesn't have one. We've tried to extend the protocol
929 * by sending NR_CONNACK | NR_CHOKE_FLAGS replies but that
930 * apparently kills BPQ boxes... :-(
931 * So now we try to follow the established behaviour of
932 * G8PZT's Xrouter which is sending packets with command type 7
933 * as an extension of the protocol.
934 */
935 if (READ_ONCE(sysctl_netrom_reset_circuit) &&
936 (frametype != NR_RESET || flags != 0))
937 nr_transmit_reset(skb, 1);
938
939 return 0;
940 }
941
942 sk = nr_find_listener(dest);
943
944 user = (ax25_address *)(skb->data + 21);
945
946 if (sk == NULL || sk_acceptq_is_full(sk) ||
947 (make = nr_make_new(sk)) == NULL) {
948 nr_transmit_refusal(skb, 0);
949 if (sk)
950 sock_put(sk);
951 return 0;
952 }
953
954 bh_lock_sock(sk);
955
956 window = skb->data[20];
957
958 sock_hold(make);
959 skb->sk = make;
960 skb->destructor = sock_efree;
961 make->sk_state = TCP_ESTABLISHED;
962
963 /* Fill in his circuit details */
964 nr_make = nr_sk(make);
965 nr_make->source_addr = *dest;
966 nr_make->dest_addr = *src;
967 nr_make->user_addr = *user;
968
969 nr_make->your_index = circuit_index;
970 nr_make->your_id = circuit_id;
971
972 bh_unlock_sock(sk);
973 circuit = nr_find_next_circuit();
974 bh_lock_sock(sk);
975
976 nr_make->my_index = circuit / 256;
977 nr_make->my_id = circuit % 256;
978
979 circuit++;
980
981 /* Window negotiation */
982 if (window < nr_make->window)
983 nr_make->window = window;
984
985 /* L4 timeout negotiation */
986 if (skb->len == 37) {
987 timeout = skb->data[36] * 256 + skb->data[35];
988 if (timeout * HZ < nr_make->t1)
989 nr_make->t1 = timeout * HZ;
990 nr_make->bpqext = 1;
991 } else {
992 nr_make->bpqext = 0;
993 }
994
995 nr_write_internal(make, NR_CONNACK);
996
997 nr_make->condition = 0x00;
998 nr_make->vs = 0;
999 nr_make->va = 0;
1000 nr_make->vr = 0;
1001 nr_make->vl = 0;
1002 nr_make->state = NR_STATE_3;
1003 sk_acceptq_added(sk);
1004 skb_queue_head(&sk->sk_receive_queue, skb);
1005
1006 if (!sock_flag(sk, SOCK_DEAD))
1007 sk->sk_data_ready(sk);
1008
1009 bh_unlock_sock(sk);
1010 sock_put(sk);
1011
1012 nr_insert_socket(make);
1013
1014 nr_start_heartbeat(make);
1015 nr_start_idletimer(make);
1016
1017 return 1;
1018 }
1019
nr_sendmsg(struct socket * sock,struct msghdr * msg,size_t len)1020 static int nr_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1021 {
1022 struct sock *sk = sock->sk;
1023 struct nr_sock *nr = nr_sk(sk);
1024 DECLARE_SOCKADDR(struct sockaddr_ax25 *, usax, msg->msg_name);
1025 int err;
1026 struct sockaddr_ax25 sax;
1027 struct sk_buff *skb;
1028 unsigned char *asmptr;
1029 int size;
1030
1031 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT))
1032 return -EINVAL;
1033
1034 lock_sock(sk);
1035 if (sock_flag(sk, SOCK_ZAPPED)) {
1036 err = -EADDRNOTAVAIL;
1037 goto out;
1038 }
1039
1040 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1041 send_sig(SIGPIPE, current, 0);
1042 err = -EPIPE;
1043 goto out;
1044 }
1045
1046 if (nr->device == NULL) {
1047 err = -ENETUNREACH;
1048 goto out;
1049 }
1050
1051 if (usax) {
1052 if (msg->msg_namelen < sizeof(sax)) {
1053 err = -EINVAL;
1054 goto out;
1055 }
1056 sax = *usax;
1057 if (ax25cmp(&nr->dest_addr, &sax.sax25_call) != 0) {
1058 err = -EISCONN;
1059 goto out;
1060 }
1061 if (sax.sax25_family != AF_NETROM) {
1062 err = -EINVAL;
1063 goto out;
1064 }
1065 } else {
1066 if (sk->sk_state != TCP_ESTABLISHED) {
1067 err = -ENOTCONN;
1068 goto out;
1069 }
1070 sax.sax25_family = AF_NETROM;
1071 sax.sax25_call = nr->dest_addr;
1072 }
1073
1074 /* Build a packet - the conventional user limit is 236 bytes. We can
1075 do ludicrously large NetROM frames but must not overflow */
1076 if (len > 65536) {
1077 err = -EMSGSIZE;
1078 goto out;
1079 }
1080
1081 size = len + NR_NETWORK_LEN + NR_TRANSPORT_LEN;
1082
1083 if ((skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL)
1084 goto out;
1085
1086 skb_reserve(skb, size - len);
1087 skb_reset_transport_header(skb);
1088
1089 /*
1090 * Push down the NET/ROM header
1091 */
1092
1093 asmptr = skb_push(skb, NR_TRANSPORT_LEN);
1094
1095 /* Build a NET/ROM Transport header */
1096
1097 *asmptr++ = nr->your_index;
1098 *asmptr++ = nr->your_id;
1099 *asmptr++ = 0; /* To be filled in later */
1100 *asmptr++ = 0; /* Ditto */
1101 *asmptr++ = NR_INFO;
1102
1103 /*
1104 * Put the data on the end
1105 */
1106 skb_put(skb, len);
1107
1108 /* User data follows immediately after the NET/ROM transport header */
1109 if (memcpy_from_msg(skb_transport_header(skb), msg, len)) {
1110 kfree_skb(skb);
1111 err = -EFAULT;
1112 goto out;
1113 }
1114
1115 if (sk->sk_state != TCP_ESTABLISHED) {
1116 kfree_skb(skb);
1117 err = -ENOTCONN;
1118 goto out;
1119 }
1120
1121 nr_output(sk, skb); /* Shove it onto the queue */
1122
1123 err = len;
1124 out:
1125 release_sock(sk);
1126 return err;
1127 }
1128
nr_recvmsg(struct socket * sock,struct msghdr * msg,size_t size,int flags)1129 static int nr_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1130 int flags)
1131 {
1132 struct sock *sk = sock->sk;
1133 DECLARE_SOCKADDR(struct sockaddr_ax25 *, sax, msg->msg_name);
1134 size_t copied;
1135 struct sk_buff *skb;
1136 int er;
1137
1138 /*
1139 * This works for seqpacket too. The receiver has ordered the queue for
1140 * us! We do one quick check first though
1141 */
1142
1143 lock_sock(sk);
1144 if (sk->sk_state != TCP_ESTABLISHED) {
1145 release_sock(sk);
1146 return -ENOTCONN;
1147 }
1148
1149 /* Now we can treat all alike */
1150 if ((skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, flags & MSG_DONTWAIT, &er)) == NULL) {
1151 release_sock(sk);
1152 return er;
1153 }
1154
1155 skb_reset_transport_header(skb);
1156 copied = skb->len;
1157
1158 if (copied > size) {
1159 copied = size;
1160 msg->msg_flags |= MSG_TRUNC;
1161 }
1162
1163 er = skb_copy_datagram_msg(skb, 0, msg, copied);
1164 if (er < 0) {
1165 skb_free_datagram(sk, skb);
1166 release_sock(sk);
1167 return er;
1168 }
1169
1170 if (sax != NULL) {
1171 memset(sax, 0, sizeof(*sax));
1172 sax->sax25_family = AF_NETROM;
1173 skb_copy_from_linear_data_offset(skb, 7, sax->sax25_call.ax25_call,
1174 AX25_ADDR_LEN);
1175 msg->msg_namelen = sizeof(*sax);
1176 }
1177
1178 skb_free_datagram(sk, skb);
1179
1180 release_sock(sk);
1181 return copied;
1182 }
1183
1184
nr_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)1185 static int nr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1186 {
1187 struct sock *sk = sock->sk;
1188 void __user *argp = (void __user *)arg;
1189
1190 switch (cmd) {
1191 case TIOCOUTQ: {
1192 long amount;
1193
1194 lock_sock(sk);
1195 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1196 if (amount < 0)
1197 amount = 0;
1198 release_sock(sk);
1199 return put_user(amount, (int __user *)argp);
1200 }
1201
1202 case TIOCINQ: {
1203 struct sk_buff *skb;
1204 long amount = 0L;
1205
1206 lock_sock(sk);
1207 /* These two are safe on a single CPU system as only user tasks fiddle here */
1208 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1209 amount = skb->len;
1210 release_sock(sk);
1211 return put_user(amount, (int __user *)argp);
1212 }
1213
1214 case SIOCGIFADDR:
1215 case SIOCSIFADDR:
1216 case SIOCGIFDSTADDR:
1217 case SIOCSIFDSTADDR:
1218 case SIOCGIFBRDADDR:
1219 case SIOCSIFBRDADDR:
1220 case SIOCGIFNETMASK:
1221 case SIOCSIFNETMASK:
1222 case SIOCGIFMETRIC:
1223 case SIOCSIFMETRIC:
1224 return -EINVAL;
1225
1226 case SIOCADDRT:
1227 case SIOCDELRT:
1228 case SIOCNRDECOBS:
1229 if (!capable(CAP_NET_ADMIN))
1230 return -EPERM;
1231 return nr_rt_ioctl(cmd, argp);
1232
1233 default:
1234 return -ENOIOCTLCMD;
1235 }
1236
1237 return 0;
1238 }
1239
1240 #ifdef CONFIG_PROC_FS
1241
nr_info_start(struct seq_file * seq,loff_t * pos)1242 static void *nr_info_start(struct seq_file *seq, loff_t *pos)
1243 {
1244 spin_lock_bh(&nr_list_lock);
1245 return seq_hlist_start_head(&nr_list, *pos);
1246 }
1247
nr_info_next(struct seq_file * seq,void * v,loff_t * pos)1248 static void *nr_info_next(struct seq_file *seq, void *v, loff_t *pos)
1249 {
1250 return seq_hlist_next(v, &nr_list, pos);
1251 }
1252
nr_info_stop(struct seq_file * seq,void * v)1253 static void nr_info_stop(struct seq_file *seq, void *v)
1254 {
1255 spin_unlock_bh(&nr_list_lock);
1256 }
1257
nr_info_show(struct seq_file * seq,void * v)1258 static int nr_info_show(struct seq_file *seq, void *v)
1259 {
1260 struct sock *s = sk_entry(v);
1261 struct net_device *dev;
1262 struct nr_sock *nr;
1263 const char *devname;
1264 char buf[11];
1265
1266 if (v == SEQ_START_TOKEN)
1267 seq_puts(seq,
1268 "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");
1269
1270 else {
1271
1272 bh_lock_sock(s);
1273 nr = nr_sk(s);
1274
1275 if ((dev = nr->device) == NULL)
1276 devname = "???";
1277 else
1278 devname = dev->name;
1279
1280 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->user_addr));
1281 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->dest_addr));
1282 seq_printf(seq,
1283 "%-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",
1284 ax2asc(buf, &nr->source_addr),
1285 devname,
1286 nr->my_index,
1287 nr->my_id,
1288 nr->your_index,
1289 nr->your_id,
1290 nr->state,
1291 nr->vs,
1292 nr->vr,
1293 nr->va,
1294 ax25_display_timer(&nr->t1timer) / HZ,
1295 nr->t1 / HZ,
1296 ax25_display_timer(&nr->t2timer) / HZ,
1297 nr->t2 / HZ,
1298 ax25_display_timer(&nr->t4timer) / HZ,
1299 nr->t4 / HZ,
1300 ax25_display_timer(&nr->idletimer) / (60 * HZ),
1301 nr->idle / (60 * HZ),
1302 nr->n2count,
1303 nr->n2,
1304 nr->window,
1305 sk_wmem_alloc_get(s),
1306 sk_rmem_alloc_get(s),
1307 s->sk_socket ? SOCK_INODE(s->sk_socket)->i_ino : 0L);
1308
1309 bh_unlock_sock(s);
1310 }
1311 return 0;
1312 }
1313
1314 static const struct seq_operations nr_info_seqops = {
1315 .start = nr_info_start,
1316 .next = nr_info_next,
1317 .stop = nr_info_stop,
1318 .show = nr_info_show,
1319 };
1320 #endif /* CONFIG_PROC_FS */
1321
1322 static const struct net_proto_family nr_family_ops = {
1323 .family = PF_NETROM,
1324 .create = nr_create,
1325 .owner = THIS_MODULE,
1326 };
1327
1328 static const struct proto_ops nr_proto_ops = {
1329 .family = PF_NETROM,
1330 .owner = THIS_MODULE,
1331 .release = nr_release,
1332 .bind = nr_bind,
1333 .connect = nr_connect,
1334 .socketpair = sock_no_socketpair,
1335 .accept = nr_accept,
1336 .getname = nr_getname,
1337 .poll = datagram_poll,
1338 .ioctl = nr_ioctl,
1339 .gettstamp = sock_gettstamp,
1340 .listen = nr_listen,
1341 .shutdown = sock_no_shutdown,
1342 .setsockopt = nr_setsockopt,
1343 .getsockopt = nr_getsockopt,
1344 .sendmsg = nr_sendmsg,
1345 .recvmsg = nr_recvmsg,
1346 .mmap = sock_no_mmap,
1347 .sendpage = sock_no_sendpage,
1348 };
1349
1350 static struct notifier_block nr_dev_notifier = {
1351 .notifier_call = nr_device_event,
1352 };
1353
1354 static struct net_device **dev_nr;
1355
1356 static struct ax25_protocol nr_pid = {
1357 .pid = AX25_P_NETROM,
1358 .func = nr_route_frame
1359 };
1360
1361 static struct ax25_linkfail nr_linkfail_notifier = {
1362 .func = nr_link_failed,
1363 };
1364
nr_proto_init(void)1365 static int __init nr_proto_init(void)
1366 {
1367 int i;
1368 int rc = proto_register(&nr_proto, 0);
1369
1370 if (rc)
1371 return rc;
1372
1373 if (nr_ndevs > 0x7fffffff/sizeof(struct net_device *)) {
1374 pr_err("NET/ROM: %s - nr_ndevs parameter too large\n",
1375 __func__);
1376 rc = -EINVAL;
1377 goto unregister_proto;
1378 }
1379
1380 dev_nr = kcalloc(nr_ndevs, sizeof(struct net_device *), GFP_KERNEL);
1381 if (!dev_nr) {
1382 pr_err("NET/ROM: %s - unable to allocate device array\n",
1383 __func__);
1384 rc = -ENOMEM;
1385 goto unregister_proto;
1386 }
1387
1388 for (i = 0; i < nr_ndevs; i++) {
1389 char name[IFNAMSIZ];
1390 struct net_device *dev;
1391
1392 sprintf(name, "nr%d", i);
1393 dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, nr_setup);
1394 if (!dev) {
1395 rc = -ENOMEM;
1396 goto fail;
1397 }
1398
1399 dev->base_addr = i;
1400 rc = register_netdev(dev);
1401 if (rc) {
1402 free_netdev(dev);
1403 goto fail;
1404 }
1405 dev_nr[i] = dev;
1406 }
1407
1408 rc = sock_register(&nr_family_ops);
1409 if (rc)
1410 goto fail;
1411
1412 rc = register_netdevice_notifier(&nr_dev_notifier);
1413 if (rc)
1414 goto out_sock;
1415
1416 ax25_register_pid(&nr_pid);
1417 ax25_linkfail_register(&nr_linkfail_notifier);
1418
1419 #ifdef CONFIG_SYSCTL
1420 rc = nr_register_sysctl();
1421 if (rc)
1422 goto out_sysctl;
1423 #endif
1424
1425 nr_loopback_init();
1426
1427 rc = -ENOMEM;
1428 if (!proc_create_seq("nr", 0444, init_net.proc_net, &nr_info_seqops))
1429 goto proc_remove1;
1430 if (!proc_create_seq("nr_neigh", 0444, init_net.proc_net,
1431 &nr_neigh_seqops))
1432 goto proc_remove2;
1433 if (!proc_create_seq("nr_nodes", 0444, init_net.proc_net,
1434 &nr_node_seqops))
1435 goto proc_remove3;
1436
1437 return 0;
1438
1439 proc_remove3:
1440 remove_proc_entry("nr_neigh", init_net.proc_net);
1441 proc_remove2:
1442 remove_proc_entry("nr", init_net.proc_net);
1443 proc_remove1:
1444
1445 nr_loopback_clear();
1446 nr_rt_free();
1447
1448 #ifdef CONFIG_SYSCTL
1449 nr_unregister_sysctl();
1450 out_sysctl:
1451 #endif
1452 ax25_linkfail_release(&nr_linkfail_notifier);
1453 ax25_protocol_release(AX25_P_NETROM);
1454 unregister_netdevice_notifier(&nr_dev_notifier);
1455 out_sock:
1456 sock_unregister(PF_NETROM);
1457 fail:
1458 while (--i >= 0) {
1459 unregister_netdev(dev_nr[i]);
1460 free_netdev(dev_nr[i]);
1461 }
1462 kfree(dev_nr);
1463 unregister_proto:
1464 proto_unregister(&nr_proto);
1465 return rc;
1466 }
1467
1468 module_init(nr_proto_init);
1469
1470 module_param(nr_ndevs, int, 0);
1471 MODULE_PARM_DESC(nr_ndevs, "number of NET/ROM devices");
1472
1473 MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>");
1474 MODULE_DESCRIPTION("The amateur radio NET/ROM network and transport layer protocol");
1475 MODULE_LICENSE("GPL");
1476 MODULE_ALIAS_NETPROTO(PF_NETROM);
1477
nr_exit(void)1478 static void __exit nr_exit(void)
1479 {
1480 int i;
1481
1482 remove_proc_entry("nr", init_net.proc_net);
1483 remove_proc_entry("nr_neigh", init_net.proc_net);
1484 remove_proc_entry("nr_nodes", init_net.proc_net);
1485 nr_loopback_clear();
1486
1487 nr_rt_free();
1488
1489 #ifdef CONFIG_SYSCTL
1490 nr_unregister_sysctl();
1491 #endif
1492
1493 ax25_linkfail_release(&nr_linkfail_notifier);
1494 ax25_protocol_release(AX25_P_NETROM);
1495
1496 unregister_netdevice_notifier(&nr_dev_notifier);
1497
1498 sock_unregister(PF_NETROM);
1499
1500 for (i = 0; i < nr_ndevs; i++) {
1501 struct net_device *dev = dev_nr[i];
1502 if (dev) {
1503 unregister_netdev(dev);
1504 free_netdev(dev);
1505 }
1506 }
1507
1508 kfree(dev_nr);
1509 proto_unregister(&nr_proto);
1510 }
1511 module_exit(nr_exit);
1512