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
nr_set_lockdep_one(struct net_device * dev,struct netdev_queue * txq,void * _unused)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
nr_set_lockdep_key(struct net_device * dev)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 */
nr_remove_socket(struct sock * sk)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 */
nr_kill_by_device(struct net_device * dev)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 */
nr_device_event(struct notifier_block * this,unsigned long event,void * ptr)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 */
nr_insert_socket(struct sock * sk)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 */
nr_find_listener(ax25_address * addr)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 */
nr_find_socket(unsigned char index,unsigned char id)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 */
nr_find_peer(unsigned char index,unsigned char id,ax25_address * dest)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 */
nr_find_next_circuit(void)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 */
nr_destroy_timer(struct timer_list * t)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 */
nr_destroy_socket(struct sock * sk)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
nr_setsockopt(struct socket * sock,int level,int optname,sockptr_t optval,unsigned int optlen)296 static int nr_setsockopt(struct socket *sock, int level, int optname,
297 sockptr_t optval, unsigned int optlen)
298 {
299 struct sock *sk = sock->sk;
300 struct nr_sock *nr = nr_sk(sk);
301 unsigned int opt;
302
303 if (level != SOL_NETROM)
304 return -ENOPROTOOPT;
305
306 if (optlen < sizeof(unsigned int))
307 return -EINVAL;
308
309 if (copy_from_sockptr(&opt, optval, sizeof(opt)))
310 return -EFAULT;
311
312 switch (optname) {
313 case NETROM_T1:
314 if (opt < 1 || opt > UINT_MAX / HZ)
315 return -EINVAL;
316 nr->t1 = opt * HZ;
317 return 0;
318
319 case NETROM_T2:
320 if (opt < 1 || opt > UINT_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 > UINT_MAX / HZ)
333 return -EINVAL;
334 nr->t4 = opt * HZ;
335 return 0;
336
337 case NETROM_IDLE:
338 if (opt > UINT_MAX / (60 * HZ))
339 return -EINVAL;
340 nr->idle = opt * 60 * HZ;
341 return 0;
342
343 default:
344 return -ENOPROTOOPT;
345 }
346 }
347
nr_getsockopt(struct socket * sock,int level,int optname,char __user * optval,int __user * optlen)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
nr_listen(struct socket * sock,int backlog)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
nr_create(struct net * net,struct socket * sock,int protocol,int kern)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
nr_make_new(struct sock * osk)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
nr_release(struct socket * sock)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
nr_bind(struct socket * sock,struct sockaddr * uaddr,int addr_len)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
nr_connect(struct socket * sock,struct sockaddr * uaddr,int addr_len,int flags)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 const 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 = (const 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
nr_accept(struct socket * sock,struct socket * newsock,int flags,bool kern)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
nr_getname(struct socket * sock,struct sockaddr * uaddr,int peer)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
nr_rx_frame(struct sk_buff * skb,struct net_device * dev)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_orphan(skb);
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 sock_hold(make);
971 skb->sk = make;
972 skb->destructor = sock_efree;
973 make->sk_state = TCP_ESTABLISHED;
974
975 /* Fill in his circuit details */
976 nr_make = nr_sk(make);
977 nr_make->source_addr = *dest;
978 nr_make->dest_addr = *src;
979 nr_make->user_addr = *user;
980
981 nr_make->your_index = circuit_index;
982 nr_make->your_id = circuit_id;
983
984 bh_unlock_sock(sk);
985 circuit = nr_find_next_circuit();
986 bh_lock_sock(sk);
987
988 nr_make->my_index = circuit / 256;
989 nr_make->my_id = circuit % 256;
990
991 circuit++;
992
993 /* Window negotiation */
994 if (window < nr_make->window)
995 nr_make->window = window;
996
997 /* L4 timeout negotiation */
998 if (skb->len == 37) {
999 timeout = skb->data[36] * 256 + skb->data[35];
1000 if (timeout * HZ < nr_make->t1)
1001 nr_make->t1 = timeout * HZ;
1002 nr_make->bpqext = 1;
1003 } else {
1004 nr_make->bpqext = 0;
1005 }
1006
1007 nr_write_internal(make, NR_CONNACK);
1008
1009 nr_make->condition = 0x00;
1010 nr_make->vs = 0;
1011 nr_make->va = 0;
1012 nr_make->vr = 0;
1013 nr_make->vl = 0;
1014 nr_make->state = NR_STATE_3;
1015 sk_acceptq_added(sk);
1016 skb_queue_head(&sk->sk_receive_queue, skb);
1017
1018 if (!sock_flag(sk, SOCK_DEAD))
1019 sk->sk_data_ready(sk);
1020
1021 bh_unlock_sock(sk);
1022 sock_put(sk);
1023
1024 nr_insert_socket(make);
1025
1026 nr_start_heartbeat(make);
1027 nr_start_idletimer(make);
1028
1029 return 1;
1030 }
1031
nr_sendmsg(struct socket * sock,struct msghdr * msg,size_t len)1032 static int nr_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1033 {
1034 struct sock *sk = sock->sk;
1035 struct nr_sock *nr = nr_sk(sk);
1036 DECLARE_SOCKADDR(struct sockaddr_ax25 *, usax, msg->msg_name);
1037 int err;
1038 struct sockaddr_ax25 sax;
1039 struct sk_buff *skb;
1040 unsigned char *asmptr;
1041 int size;
1042
1043 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT))
1044 return -EINVAL;
1045
1046 lock_sock(sk);
1047 if (sock_flag(sk, SOCK_ZAPPED)) {
1048 err = -EADDRNOTAVAIL;
1049 goto out;
1050 }
1051
1052 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1053 send_sig(SIGPIPE, current, 0);
1054 err = -EPIPE;
1055 goto out;
1056 }
1057
1058 if (nr->device == NULL) {
1059 err = -ENETUNREACH;
1060 goto out;
1061 }
1062
1063 if (usax) {
1064 if (msg->msg_namelen < sizeof(sax)) {
1065 err = -EINVAL;
1066 goto out;
1067 }
1068 sax = *usax;
1069 if (ax25cmp(&nr->dest_addr, &sax.sax25_call) != 0) {
1070 err = -EISCONN;
1071 goto out;
1072 }
1073 if (sax.sax25_family != AF_NETROM) {
1074 err = -EINVAL;
1075 goto out;
1076 }
1077 } else {
1078 if (sk->sk_state != TCP_ESTABLISHED) {
1079 err = -ENOTCONN;
1080 goto out;
1081 }
1082 sax.sax25_family = AF_NETROM;
1083 sax.sax25_call = nr->dest_addr;
1084 }
1085
1086 /* Build a packet - the conventional user limit is 236 bytes. We can
1087 do ludicrously large NetROM frames but must not overflow */
1088 if (len > 65536) {
1089 err = -EMSGSIZE;
1090 goto out;
1091 }
1092
1093 size = len + NR_NETWORK_LEN + NR_TRANSPORT_LEN;
1094
1095 if ((skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL)
1096 goto out;
1097
1098 skb_reserve(skb, size - len);
1099 skb_reset_transport_header(skb);
1100
1101 /*
1102 * Push down the NET/ROM header
1103 */
1104
1105 asmptr = skb_push(skb, NR_TRANSPORT_LEN);
1106
1107 /* Build a NET/ROM Transport header */
1108
1109 *asmptr++ = nr->your_index;
1110 *asmptr++ = nr->your_id;
1111 *asmptr++ = 0; /* To be filled in later */
1112 *asmptr++ = 0; /* Ditto */
1113 *asmptr++ = NR_INFO;
1114
1115 /*
1116 * Put the data on the end
1117 */
1118 skb_put(skb, len);
1119
1120 /* User data follows immediately after the NET/ROM transport header */
1121 if (memcpy_from_msg(skb_transport_header(skb), msg, len)) {
1122 kfree_skb(skb);
1123 err = -EFAULT;
1124 goto out;
1125 }
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
nr_recvmsg(struct socket * sock,struct msghdr * msg,size_t size,int flags)1141 static int nr_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1142 int flags)
1143 {
1144 struct sock *sk = sock->sk;
1145 DECLARE_SOCKADDR(struct sockaddr_ax25 *, sax, 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 skb = skb_recv_datagram(sk, flags, &er);
1163 if (!skb) {
1164 release_sock(sk);
1165 return er;
1166 }
1167
1168 skb_reset_transport_header(skb);
1169 copied = skb->len;
1170
1171 if (copied > size) {
1172 copied = size;
1173 msg->msg_flags |= MSG_TRUNC;
1174 }
1175
1176 er = skb_copy_datagram_msg(skb, 0, msg, copied);
1177 if (er < 0) {
1178 skb_free_datagram(sk, skb);
1179 release_sock(sk);
1180 return er;
1181 }
1182
1183 if (sax != NULL) {
1184 memset(sax, 0, sizeof(*sax));
1185 sax->sax25_family = AF_NETROM;
1186 skb_copy_from_linear_data_offset(skb, 7, sax->sax25_call.ax25_call,
1187 AX25_ADDR_LEN);
1188 msg->msg_namelen = sizeof(*sax);
1189 }
1190
1191 skb_free_datagram(sk, skb);
1192
1193 release_sock(sk);
1194 return copied;
1195 }
1196
1197
nr_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)1198 static int nr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1199 {
1200 struct sock *sk = sock->sk;
1201 void __user *argp = (void __user *)arg;
1202
1203 switch (cmd) {
1204 case TIOCOUTQ: {
1205 long amount;
1206
1207 lock_sock(sk);
1208 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1209 if (amount < 0)
1210 amount = 0;
1211 release_sock(sk);
1212 return put_user(amount, (int __user *)argp);
1213 }
1214
1215 case TIOCINQ: {
1216 struct sk_buff *skb;
1217 long amount = 0L;
1218
1219 lock_sock(sk);
1220 /* These two are safe on a single CPU system as only user tasks fiddle here */
1221 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1222 amount = skb->len;
1223 release_sock(sk);
1224 return put_user(amount, (int __user *)argp);
1225 }
1226
1227 case SIOCGIFADDR:
1228 case SIOCSIFADDR:
1229 case SIOCGIFDSTADDR:
1230 case SIOCSIFDSTADDR:
1231 case SIOCGIFBRDADDR:
1232 case SIOCSIFBRDADDR:
1233 case SIOCGIFNETMASK:
1234 case SIOCSIFNETMASK:
1235 case SIOCGIFMETRIC:
1236 case SIOCSIFMETRIC:
1237 return -EINVAL;
1238
1239 case SIOCADDRT:
1240 case SIOCDELRT:
1241 case SIOCNRDECOBS:
1242 if (!capable(CAP_NET_ADMIN))
1243 return -EPERM;
1244 return nr_rt_ioctl(cmd, argp);
1245
1246 default:
1247 return -ENOIOCTLCMD;
1248 }
1249
1250 return 0;
1251 }
1252
1253 #ifdef CONFIG_PROC_FS
1254
nr_info_start(struct seq_file * seq,loff_t * pos)1255 static void *nr_info_start(struct seq_file *seq, loff_t *pos)
1256 __acquires(&nr_list_lock)
1257 {
1258 spin_lock_bh(&nr_list_lock);
1259 return seq_hlist_start_head(&nr_list, *pos);
1260 }
1261
nr_info_next(struct seq_file * seq,void * v,loff_t * pos)1262 static void *nr_info_next(struct seq_file *seq, void *v, loff_t *pos)
1263 {
1264 return seq_hlist_next(v, &nr_list, pos);
1265 }
1266
nr_info_stop(struct seq_file * seq,void * v)1267 static void nr_info_stop(struct seq_file *seq, void *v)
1268 __releases(&nr_list_lock)
1269 {
1270 spin_unlock_bh(&nr_list_lock);
1271 }
1272
nr_info_show(struct seq_file * seq,void * v)1273 static int nr_info_show(struct seq_file *seq, void *v)
1274 {
1275 struct sock *s = sk_entry(v);
1276 struct net_device *dev;
1277 struct nr_sock *nr;
1278 const char *devname;
1279 char buf[11];
1280
1281 if (v == SEQ_START_TOKEN)
1282 seq_puts(seq,
1283 "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");
1284
1285 else {
1286
1287 bh_lock_sock(s);
1288 nr = nr_sk(s);
1289
1290 if ((dev = nr->device) == NULL)
1291 devname = "???";
1292 else
1293 devname = dev->name;
1294
1295 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->user_addr));
1296 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->dest_addr));
1297 seq_printf(seq,
1298 "%-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",
1299 ax2asc(buf, &nr->source_addr),
1300 devname,
1301 nr->my_index,
1302 nr->my_id,
1303 nr->your_index,
1304 nr->your_id,
1305 nr->state,
1306 nr->vs,
1307 nr->vr,
1308 nr->va,
1309 ax25_display_timer(&nr->t1timer) / HZ,
1310 nr->t1 / HZ,
1311 ax25_display_timer(&nr->t2timer) / HZ,
1312 nr->t2 / HZ,
1313 ax25_display_timer(&nr->t4timer) / HZ,
1314 nr->t4 / HZ,
1315 ax25_display_timer(&nr->idletimer) / (60 * HZ),
1316 nr->idle / (60 * HZ),
1317 nr->n2count,
1318 nr->n2,
1319 nr->window,
1320 sk_wmem_alloc_get(s),
1321 sk_rmem_alloc_get(s),
1322 s->sk_socket ? SOCK_INODE(s->sk_socket)->i_ino : 0L);
1323
1324 bh_unlock_sock(s);
1325 }
1326 return 0;
1327 }
1328
1329 static const struct seq_operations nr_info_seqops = {
1330 .start = nr_info_start,
1331 .next = nr_info_next,
1332 .stop = nr_info_stop,
1333 .show = nr_info_show,
1334 };
1335 #endif /* CONFIG_PROC_FS */
1336
1337 static const struct net_proto_family nr_family_ops = {
1338 .family = PF_NETROM,
1339 .create = nr_create,
1340 .owner = THIS_MODULE,
1341 };
1342
1343 static const struct proto_ops nr_proto_ops = {
1344 .family = PF_NETROM,
1345 .owner = THIS_MODULE,
1346 .release = nr_release,
1347 .bind = nr_bind,
1348 .connect = nr_connect,
1349 .socketpair = sock_no_socketpair,
1350 .accept = nr_accept,
1351 .getname = nr_getname,
1352 .poll = datagram_poll,
1353 .ioctl = nr_ioctl,
1354 .gettstamp = sock_gettstamp,
1355 .listen = nr_listen,
1356 .shutdown = sock_no_shutdown,
1357 .setsockopt = nr_setsockopt,
1358 .getsockopt = nr_getsockopt,
1359 .sendmsg = nr_sendmsg,
1360 .recvmsg = nr_recvmsg,
1361 .mmap = sock_no_mmap,
1362 .sendpage = sock_no_sendpage,
1363 };
1364
1365 static struct notifier_block nr_dev_notifier = {
1366 .notifier_call = nr_device_event,
1367 };
1368
1369 static struct net_device **dev_nr;
1370
1371 static struct ax25_protocol nr_pid = {
1372 .pid = AX25_P_NETROM,
1373 .func = nr_route_frame
1374 };
1375
1376 static struct ax25_linkfail nr_linkfail_notifier = {
1377 .func = nr_link_failed,
1378 };
1379
nr_proto_init(void)1380 static int __init nr_proto_init(void)
1381 {
1382 int i;
1383 int rc = proto_register(&nr_proto, 0);
1384
1385 if (rc)
1386 return rc;
1387
1388 if (nr_ndevs > 0x7fffffff/sizeof(struct net_device *)) {
1389 pr_err("NET/ROM: %s - nr_ndevs parameter too large\n",
1390 __func__);
1391 rc = -EINVAL;
1392 goto unregister_proto;
1393 }
1394
1395 dev_nr = kcalloc(nr_ndevs, sizeof(struct net_device *), GFP_KERNEL);
1396 if (!dev_nr) {
1397 pr_err("NET/ROM: %s - unable to allocate device array\n",
1398 __func__);
1399 rc = -ENOMEM;
1400 goto unregister_proto;
1401 }
1402
1403 for (i = 0; i < nr_ndevs; i++) {
1404 char name[IFNAMSIZ];
1405 struct net_device *dev;
1406
1407 sprintf(name, "nr%d", i);
1408 dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, nr_setup);
1409 if (!dev) {
1410 rc = -ENOMEM;
1411 goto fail;
1412 }
1413
1414 dev->base_addr = i;
1415 rc = register_netdev(dev);
1416 if (rc) {
1417 free_netdev(dev);
1418 goto fail;
1419 }
1420 nr_set_lockdep_key(dev);
1421 dev_nr[i] = dev;
1422 }
1423
1424 rc = sock_register(&nr_family_ops);
1425 if (rc)
1426 goto fail;
1427
1428 rc = register_netdevice_notifier(&nr_dev_notifier);
1429 if (rc)
1430 goto out_sock;
1431
1432 ax25_register_pid(&nr_pid);
1433 ax25_linkfail_register(&nr_linkfail_notifier);
1434
1435 #ifdef CONFIG_SYSCTL
1436 rc = nr_register_sysctl();
1437 if (rc)
1438 goto out_sysctl;
1439 #endif
1440
1441 nr_loopback_init();
1442
1443 rc = -ENOMEM;
1444 if (!proc_create_seq("nr", 0444, init_net.proc_net, &nr_info_seqops))
1445 goto proc_remove1;
1446 if (!proc_create_seq("nr_neigh", 0444, init_net.proc_net,
1447 &nr_neigh_seqops))
1448 goto proc_remove2;
1449 if (!proc_create_seq("nr_nodes", 0444, init_net.proc_net,
1450 &nr_node_seqops))
1451 goto proc_remove3;
1452
1453 return 0;
1454
1455 proc_remove3:
1456 remove_proc_entry("nr_neigh", init_net.proc_net);
1457 proc_remove2:
1458 remove_proc_entry("nr", init_net.proc_net);
1459 proc_remove1:
1460
1461 nr_loopback_clear();
1462 nr_rt_free();
1463
1464 #ifdef CONFIG_SYSCTL
1465 nr_unregister_sysctl();
1466 out_sysctl:
1467 #endif
1468 ax25_linkfail_release(&nr_linkfail_notifier);
1469 ax25_protocol_release(AX25_P_NETROM);
1470 unregister_netdevice_notifier(&nr_dev_notifier);
1471 out_sock:
1472 sock_unregister(PF_NETROM);
1473 fail:
1474 while (--i >= 0) {
1475 unregister_netdev(dev_nr[i]);
1476 free_netdev(dev_nr[i]);
1477 }
1478 kfree(dev_nr);
1479 unregister_proto:
1480 proto_unregister(&nr_proto);
1481 return rc;
1482 }
1483
1484 module_init(nr_proto_init);
1485
1486 module_param(nr_ndevs, int, 0);
1487 MODULE_PARM_DESC(nr_ndevs, "number of NET/ROM devices");
1488
1489 MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>");
1490 MODULE_DESCRIPTION("The amateur radio NET/ROM network and transport layer protocol");
1491 MODULE_LICENSE("GPL");
1492 MODULE_ALIAS_NETPROTO(PF_NETROM);
1493
nr_exit(void)1494 static void __exit nr_exit(void)
1495 {
1496 int i;
1497
1498 remove_proc_entry("nr", init_net.proc_net);
1499 remove_proc_entry("nr_neigh", init_net.proc_net);
1500 remove_proc_entry("nr_nodes", init_net.proc_net);
1501 nr_loopback_clear();
1502
1503 nr_rt_free();
1504
1505 #ifdef CONFIG_SYSCTL
1506 nr_unregister_sysctl();
1507 #endif
1508
1509 ax25_linkfail_release(&nr_linkfail_notifier);
1510 ax25_protocol_release(AX25_P_NETROM);
1511
1512 unregister_netdevice_notifier(&nr_dev_notifier);
1513
1514 sock_unregister(PF_NETROM);
1515
1516 for (i = 0; i < nr_ndevs; i++) {
1517 struct net_device *dev = dev_nr[i];
1518 if (dev) {
1519 unregister_netdev(dev);
1520 free_netdev(dev);
1521 }
1522 }
1523
1524 kfree(dev_nr);
1525 proto_unregister(&nr_proto);
1526 }
1527 module_exit(nr_exit);
1528
