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sched: move the __update_rq_clock() call to scheduler_tick()
[usb.git] / net / netrom / af_netrom.c
blobdc9273295a382a98b2564718fa95d6a6ab74c0b8
1 /*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
6 *
7 * Copyright Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
8 * Copyright Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk)
9 * Copyright Darryl Miles G7LED (dlm@g7led.demon.co.uk)
10 */
11 #include <linux/module.h>
12 #include <linux/moduleparam.h>
13 #include <linux/capability.h>
14 #include <linux/errno.h>
15 #include <linux/types.h>
16 #include <linux/socket.h>
17 #include <linux/in.h>
18 #include <linux/kernel.h>
19 #include <linux/sched.h>
20 #include <linux/timer.h>
21 #include <linux/string.h>
22 #include <linux/sockios.h>
23 #include <linux/net.h>
24 #include <linux/stat.h>
25 #include <net/ax25.h>
26 #include <linux/inet.h>
27 #include <linux/netdevice.h>
28 #include <linux/if_arp.h>
29 #include <linux/skbuff.h>
30 #include <net/sock.h>
31 #include <asm/uaccess.h>
32 #include <asm/system.h>
33 #include <linux/fcntl.h>
34 #include <linux/termios.h> /* For TIOCINQ/OUTQ */
35 #include <linux/mm.h>
36 #include <linux/interrupt.h>
37 #include <linux/notifier.h>
38 #include <net/netrom.h>
39 #include <linux/proc_fs.h>
40 #include <linux/seq_file.h>
41 #include <net/ip.h>
42 #include <net/tcp_states.h>
43 #include <net/arp.h>
44 #include <linux/init.h>
45
46 static int nr_ndevs = 4;
47
48 int sysctl_netrom_default_path_quality = NR_DEFAULT_QUAL;
49 int sysctl_netrom_obsolescence_count_initialiser = NR_DEFAULT_OBS;
50 int sysctl_netrom_network_ttl_initialiser = NR_DEFAULT_TTL;
51 int sysctl_netrom_transport_timeout = NR_DEFAULT_T1;
52 int sysctl_netrom_transport_maximum_tries = NR_DEFAULT_N2;
53 int sysctl_netrom_transport_acknowledge_delay = NR_DEFAULT_T2;
54 int sysctl_netrom_transport_busy_delay = NR_DEFAULT_T4;
55 int sysctl_netrom_transport_requested_window_size = NR_DEFAULT_WINDOW;
56 int sysctl_netrom_transport_no_activity_timeout = NR_DEFAULT_IDLE;
57 int sysctl_netrom_routing_control = NR_DEFAULT_ROUTING;
58 int sysctl_netrom_link_fails_count = NR_DEFAULT_FAILS;
59 int sysctl_netrom_reset_circuit = NR_DEFAULT_RESET;
60
61 static unsigned short circuit = 0x101;
62
63 static HLIST_HEAD(nr_list);
64 static DEFINE_SPINLOCK(nr_list_lock);
65
66 static const struct proto_ops nr_proto_ops;
67
68 /*
69 * NETROM network devices are virtual network devices encapsulating NETROM
70 * frames into AX.25 which will be sent through an AX.25 device, so form a
71 * special "super class" of normal net devices; split their locks off into a
72 * separate class since they always nest.
73 */
74 static struct lock_class_key nr_netdev_xmit_lock_key;
75
76 /*
77 * Socket removal during an interrupt is now safe.
78 */
79 static void nr_remove_socket(struct sock *sk)
80 {
81 spin_lock_bh(&nr_list_lock);
82 sk_del_node_init(sk);
83 spin_unlock_bh(&nr_list_lock);
84 }
85
86 /*
87 * Kill all bound sockets on a dropped device.
88 */
89 static void nr_kill_by_device(struct net_device *dev)
90 {
91 struct sock *s;
92 struct hlist_node *node;
93
94 spin_lock_bh(&nr_list_lock);
95 sk_for_each(s, node, &nr_list)
96 if (nr_sk(s)->device == dev)
97 nr_disconnect(s, ENETUNREACH);
98 spin_unlock_bh(&nr_list_lock);
99 }
100
101 /*
102 * Handle device status changes.
103 */
104 static int nr_device_event(struct notifier_block *this, unsigned long event, void *ptr)
105 {
106 struct net_device *dev = (struct net_device *)ptr;
107
108 if (event != NETDEV_DOWN)
109 return NOTIFY_DONE;
110
111 nr_kill_by_device(dev);
112 nr_rt_device_down(dev);
113
114 return NOTIFY_DONE;
115 }
116
117 /*
118 * Add a socket to the bound sockets list.
119 */
120 static void nr_insert_socket(struct sock *sk)
121 {
122 spin_lock_bh(&nr_list_lock);
123 sk_add_node(sk, &nr_list);
124 spin_unlock_bh(&nr_list_lock);
125 }
126
127 /*
128 * Find a socket that wants to accept the Connect Request we just
129 * received.
130 */
131 static struct sock *nr_find_listener(ax25_address *addr)
132 {
133 struct sock *s;
134 struct hlist_node *node;
135
136 spin_lock_bh(&nr_list_lock);
137 sk_for_each(s, node, &nr_list)
138 if (!ax25cmp(&nr_sk(s)->source_addr, addr) &&
139 s->sk_state == TCP_LISTEN) {
140 bh_lock_sock(s);
141 goto found;
142 }
143 s = NULL;
144 found:
145 spin_unlock_bh(&nr_list_lock);
146 return s;
147 }
148
149 /*
150 * Find a connected NET/ROM socket given my circuit IDs.
151 */
152 static struct sock *nr_find_socket(unsigned char index, unsigned char id)
153 {
154 struct sock *s;
155 struct hlist_node *node;
156
157 spin_lock_bh(&nr_list_lock);
158 sk_for_each(s, node, &nr_list) {
159 struct nr_sock *nr = nr_sk(s);
160
161 if (nr->my_index == index && nr->my_id == id) {
162 bh_lock_sock(s);
163 goto found;
164 }
165 }
166 s = NULL;
167 found:
168 spin_unlock_bh(&nr_list_lock);
169 return s;
170 }
171
172 /*
173 * Find a connected NET/ROM socket given their circuit IDs.
174 */
175 static struct sock *nr_find_peer(unsigned char index, unsigned char id,
176 ax25_address *dest)
177 {
178 struct sock *s;
179 struct hlist_node *node;
180
181 spin_lock_bh(&nr_list_lock);
182 sk_for_each(s, node, &nr_list) {
183 struct nr_sock *nr = nr_sk(s);
184
185 if (nr->your_index == index && nr->your_id == id &&
186 !ax25cmp(&nr->dest_addr, dest)) {
187 bh_lock_sock(s);
188 goto found;
189 }
190 }
191 s = NULL;
192 found:
193 spin_unlock_bh(&nr_list_lock);
194 return s;
195 }
196
197 /*
198 * Find next free circuit ID.
199 */
200 static unsigned short nr_find_next_circuit(void)
201 {
202 unsigned short id = circuit;
203 unsigned char i, j;
204 struct sock *sk;
205
206 for (;;) {
207 i = id / 256;
208 j = id % 256;
209
210 if (i != 0 && j != 0) {
211 if ((sk=nr_find_socket(i, j)) == NULL)
212 break;
213 bh_unlock_sock(sk);
214 }
215
216 id++;
217 }
218
219 return id;
220 }
221
222 /*
223 * Deferred destroy.
224 */
225 void nr_destroy_socket(struct sock *);
226
227 /*
228 * Handler for deferred kills.
229 */
230 static void nr_destroy_timer(unsigned long data)
231 {
232 struct sock *sk=(struct sock *)data;
233 bh_lock_sock(sk);
234 sock_hold(sk);
235 nr_destroy_socket(sk);
236 bh_unlock_sock(sk);
237 sock_put(sk);
238 }
239
240 /*
241 * This is called from user mode and the timers. Thus it protects itself
242 * against interrupt users but doesn't worry about being called during
243 * work. Once it is removed from the queue no interrupt or bottom half
244 * will touch it and we are (fairly 8-) ) safe.
245 */
246 void nr_destroy_socket(struct sock *sk)
247 {
248 struct sk_buff *skb;
249
250 nr_remove_socket(sk);
251
252 nr_stop_heartbeat(sk);
253 nr_stop_t1timer(sk);
254 nr_stop_t2timer(sk);
255 nr_stop_t4timer(sk);
256 nr_stop_idletimer(sk);
257
258 nr_clear_queues(sk); /* Flush the queues */
259
260 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
261 if (skb->sk != sk) { /* A pending connection */
262 /* Queue the unaccepted socket for death */
263 sock_set_flag(skb->sk, SOCK_DEAD);
264 nr_start_heartbeat(skb->sk);
265 nr_sk(skb->sk)->state = NR_STATE_0;
266 }
267
268 kfree_skb(skb);
269 }
270
271 if (atomic_read(&sk->sk_wmem_alloc) ||
272 atomic_read(&sk->sk_rmem_alloc)) {
273 /* Defer: outstanding buffers */
274 sk->sk_timer.function = nr_destroy_timer;
275 sk->sk_timer.expires = jiffies + 2 * HZ;
276 add_timer(&sk->sk_timer);
277 } else
278 sock_put(sk);
279 }
280
281 /*
282 * Handling for system calls applied via the various interfaces to a
283 * NET/ROM socket object.
284 */
285
286 static int nr_setsockopt(struct socket *sock, int level, int optname,
287 char __user *optval, int optlen)
288 {
289 struct sock *sk = sock->sk;
290 struct nr_sock *nr = nr_sk(sk);
291 int opt;
292
293 if (level != SOL_NETROM)
294 return -ENOPROTOOPT;
295
296 if (optlen < sizeof(int))
297 return -EINVAL;
298
299 if (get_user(opt, (int __user *)optval))
300 return -EFAULT;
301
302 switch (optname) {
303 case NETROM_T1:
304 if (opt < 1)
305 return -EINVAL;
306 nr->t1 = opt * HZ;
307 return 0;
308
309 case NETROM_T2:
310 if (opt < 1)
311 return -EINVAL;
312 nr->t2 = opt * HZ;
313 return 0;
314
315 case NETROM_N2:
316 if (opt < 1 || opt > 31)
317 return -EINVAL;
318 nr->n2 = opt;
319 return 0;
320
321 case NETROM_T4:
322 if (opt < 1)
323 return -EINVAL;
324 nr->t4 = opt * HZ;
325 return 0;
326
327 case NETROM_IDLE:
328 if (opt < 0)
329 return -EINVAL;
330 nr->idle = opt * 60 * HZ;
331 return 0;
332
333 default:
334 return -ENOPROTOOPT;
335 }
336 }
337
338 static int nr_getsockopt(struct socket *sock, int level, int optname,
339 char __user *optval, int __user *optlen)
340 {
341 struct sock *sk = sock->sk;
342 struct nr_sock *nr = nr_sk(sk);
343 int val = 0;
344 int len;
345
346 if (level != SOL_NETROM)
347 return -ENOPROTOOPT;
348
349 if (get_user(len, optlen))
350 return -EFAULT;
351
352 if (len < 0)
353 return -EINVAL;
354
355 switch (optname) {
356 case NETROM_T1:
357 val = nr->t1 / HZ;
358 break;
359
360 case NETROM_T2:
361 val = nr->t2 / HZ;
362 break;
363
364 case NETROM_N2:
365 val = nr->n2;
366 break;
367
368 case NETROM_T4:
369 val = nr->t4 / HZ;
370 break;
371
372 case NETROM_IDLE:
373 val = nr->idle / (60 * HZ);
374 break;
375
376 default:
377 return -ENOPROTOOPT;
378 }
379
380 len = min_t(unsigned int, len, sizeof(int));
381
382 if (put_user(len, optlen))
383 return -EFAULT;
384
385 return copy_to_user(optval, &val, len) ? -EFAULT : 0;
386 }
387
388 static int nr_listen(struct socket *sock, int backlog)
389 {
390 struct sock *sk = sock->sk;
391
392 lock_sock(sk);
393 if (sk->sk_state != TCP_LISTEN) {
394 memset(&nr_sk(sk)->user_addr, 0, AX25_ADDR_LEN);
395 sk->sk_max_ack_backlog = backlog;
396 sk->sk_state = TCP_LISTEN;
397 release_sock(sk);
398 return 0;
399 }
400 release_sock(sk);
401
402 return -EOPNOTSUPP;
403 }
404
405 static struct proto nr_proto = {
406 .name = "NETROM",
407 .owner = THIS_MODULE,
408 .obj_size = sizeof(struct nr_sock),
409 };
410
411 static int nr_create(struct socket *sock, int protocol)
412 {
413 struct sock *sk;
414 struct nr_sock *nr;
415
416 if (sock->type != SOCK_SEQPACKET || protocol != 0)
417 return -ESOCKTNOSUPPORT;
418
419 if ((sk = sk_alloc(PF_NETROM, GFP_ATOMIC, &nr_proto, 1)) == NULL)
420 return -ENOMEM;
421
422 nr = nr_sk(sk);
423
424 sock_init_data(sock, sk);
425
426 sock->ops = &nr_proto_ops;
427 sk->sk_protocol = protocol;
428
429 skb_queue_head_init(&nr->ack_queue);
430 skb_queue_head_init(&nr->reseq_queue);
431 skb_queue_head_init(&nr->frag_queue);
432
433 nr_init_timers(sk);
434
435 nr->t1 =
436 msecs_to_jiffies(sysctl_netrom_transport_timeout);
437 nr->t2 =
438 msecs_to_jiffies(sysctl_netrom_transport_acknowledge_delay);
439 nr->n2 =
440 msecs_to_jiffies(sysctl_netrom_transport_maximum_tries);
441 nr->t4 =
442 msecs_to_jiffies(sysctl_netrom_transport_busy_delay);
443 nr->idle =
444 msecs_to_jiffies(sysctl_netrom_transport_no_activity_timeout);
445 nr->window = sysctl_netrom_transport_requested_window_size;
446
447 nr->bpqext = 1;
448 nr->state = NR_STATE_0;
449
450 return 0;
451 }
452
453 static struct sock *nr_make_new(struct sock *osk)
454 {
455 struct sock *sk;
456 struct nr_sock *nr, *onr;
457
458 if (osk->sk_type != SOCK_SEQPACKET)
459 return NULL;
460
461 if ((sk = sk_alloc(PF_NETROM, GFP_ATOMIC, osk->sk_prot, 1)) == NULL)
462 return NULL;
463
464 nr = nr_sk(sk);
465
466 sock_init_data(NULL, sk);
467
468 sk->sk_type = osk->sk_type;
469 sk->sk_socket = osk->sk_socket;
470 sk->sk_priority = osk->sk_priority;
471 sk->sk_protocol = osk->sk_protocol;
472 sk->sk_rcvbuf = osk->sk_rcvbuf;
473 sk->sk_sndbuf = osk->sk_sndbuf;
474 sk->sk_state = TCP_ESTABLISHED;
475 sk->sk_sleep = osk->sk_sleep;
476 sock_copy_flags(sk, osk);
477
478 skb_queue_head_init(&nr->ack_queue);
479 skb_queue_head_init(&nr->reseq_queue);
480 skb_queue_head_init(&nr->frag_queue);
481
482 nr_init_timers(sk);
483
484 onr = nr_sk(osk);
485
486 nr->t1 = onr->t1;
487 nr->t2 = onr->t2;
488 nr->n2 = onr->n2;
489 nr->t4 = onr->t4;
490 nr->idle = onr->idle;
491 nr->window = onr->window;
492
493 nr->device = onr->device;
494 nr->bpqext = onr->bpqext;
495
496 return sk;
497 }
498
499 static int nr_release(struct socket *sock)
500 {
501 struct sock *sk = sock->sk;
502 struct nr_sock *nr;
503
504 if (sk == NULL) return 0;
505
506 sock_hold(sk);
507 lock_sock(sk);
508 nr = nr_sk(sk);
509
510 switch (nr->state) {
511 case NR_STATE_0:
512 case NR_STATE_1:
513 case NR_STATE_2:
514 nr_disconnect(sk, 0);
515 nr_destroy_socket(sk);
516 break;
517
518 case NR_STATE_3:
519 nr_clear_queues(sk);
520 nr->n2count = 0;
521 nr_write_internal(sk, NR_DISCREQ);
522 nr_start_t1timer(sk);
523 nr_stop_t2timer(sk);
524 nr_stop_t4timer(sk);
525 nr_stop_idletimer(sk);
526 nr->state = NR_STATE_2;
527 sk->sk_state = TCP_CLOSE;
528 sk->sk_shutdown |= SEND_SHUTDOWN;
529 sk->sk_state_change(sk);
530 sock_orphan(sk);
531 sock_set_flag(sk, SOCK_DESTROY);
532 sk->sk_socket = NULL;
533 break;
534
535 default:
536 sk->sk_socket = NULL;
537 break;
538 }
539
540 sock->sk = NULL;
541 release_sock(sk);
542 sock_put(sk);
543
544 return 0;
545 }
546
547 static int nr_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
548 {
549 struct sock *sk = sock->sk;
550 struct nr_sock *nr = nr_sk(sk);
551 struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr;
552 struct net_device *dev;
553 ax25_uid_assoc *user;
554 ax25_address *source;
555
556 lock_sock(sk);
557 if (!sock_flag(sk, SOCK_ZAPPED)) {
558 release_sock(sk);
559 return -EINVAL;
560 }
561 if (addr_len < sizeof(struct sockaddr_ax25) || addr_len > sizeof(struct full_sockaddr_ax25)) {
562 release_sock(sk);
563 return -EINVAL;
564 }
565 if (addr_len < (addr->fsa_ax25.sax25_ndigis * sizeof(ax25_address) + sizeof(struct sockaddr_ax25))) {
566 release_sock(sk);
567 return -EINVAL;
568 }
569 if (addr->fsa_ax25.sax25_family != AF_NETROM) {
570 release_sock(sk);
571 return -EINVAL;
572 }
573 if ((dev = nr_dev_get(&addr->fsa_ax25.sax25_call)) == NULL) {
574 SOCK_DEBUG(sk, "NET/ROM: bind failed: invalid node callsign\n");
575 release_sock(sk);
576 return -EADDRNOTAVAIL;
577 }
578
579 /*
580 * Only the super user can set an arbitrary user callsign.
581 */
582 if (addr->fsa_ax25.sax25_ndigis == 1) {
583 if (!capable(CAP_NET_BIND_SERVICE)) {
584 dev_put(dev);
585 release_sock(sk);
586 return -EACCES;
587 }
588 nr->user_addr = addr->fsa_digipeater[0];
589 nr->source_addr = addr->fsa_ax25.sax25_call;
590 } else {
591 source = &addr->fsa_ax25.sax25_call;
592
593 user = ax25_findbyuid(current->euid);
594 if (user) {
595 nr->user_addr = user->call;
596 ax25_uid_put(user);
597 } else {
598 if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) {
599 release_sock(sk);
600 dev_put(dev);
601 return -EPERM;
602 }
603 nr->user_addr = *source;
604 }
605
606 nr->source_addr = *source;
607 }
608
609 nr->device = dev;
610 nr_insert_socket(sk);
611
612 sock_reset_flag(sk, SOCK_ZAPPED);
613 dev_put(dev);
614 release_sock(sk);
615 SOCK_DEBUG(sk, "NET/ROM: socket is bound\n");
616 return 0;
617 }
618
619 static int nr_connect(struct socket *sock, struct sockaddr *uaddr,
620 int addr_len, int flags)
621 {
622 struct sock *sk = sock->sk;
623 struct nr_sock *nr = nr_sk(sk);
624 struct sockaddr_ax25 *addr = (struct sockaddr_ax25 *)uaddr;
625 ax25_address *source = NULL;
626 ax25_uid_assoc *user;
627 struct net_device *dev;
628 int err = 0;
629
630 lock_sock(sk);
631 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
632 sock->state = SS_CONNECTED;
633 goto out_release; /* Connect completed during a ERESTARTSYS event */
634 }
635
636 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
637 sock->state = SS_UNCONNECTED;
638 err = -ECONNREFUSED;
639 goto out_release;
640 }
641
642 if (sk->sk_state == TCP_ESTABLISHED) {
643 err = -EISCONN; /* No reconnect on a seqpacket socket */
644 goto out_release;
645 }
646
647 sk->sk_state = TCP_CLOSE;
648 sock->state = SS_UNCONNECTED;
649
650 if (addr_len != sizeof(struct sockaddr_ax25) && addr_len != sizeof(struct full_sockaddr_ax25)) {
651 err = -EINVAL;
652 goto out_release;
653 }
654 if (addr->sax25_family != AF_NETROM) {
655 err = -EINVAL;
656 goto out_release;
657 }
658 if (sock_flag(sk, SOCK_ZAPPED)) { /* Must bind first - autobinding in this may or may not work */
659 sock_reset_flag(sk, SOCK_ZAPPED);
660
661 if ((dev = nr_dev_first()) == NULL) {
662 err = -ENETUNREACH;
663 goto out_release;
664 }
665 source = (ax25_address *)dev->dev_addr;
666
667 user = ax25_findbyuid(current->euid);
668 if (user) {
669 nr->user_addr = user->call;
670 ax25_uid_put(user);
671 } else {
672 if (ax25_uid_policy && !capable(CAP_NET_ADMIN)) {
673 dev_put(dev);
674 err = -EPERM;
675 goto out_release;
676 }
677 nr->user_addr = *source;
678 }
679
680 nr->source_addr = *source;
681 nr->device = dev;
682
683 dev_put(dev);
684 nr_insert_socket(sk); /* Finish the bind */
685 }
686
687 nr->dest_addr = addr->sax25_call;
688
689 release_sock(sk);
690 circuit = nr_find_next_circuit();
691 lock_sock(sk);
692
693 nr->my_index = circuit / 256;
694 nr->my_id = circuit % 256;
695
696 circuit++;
697
698 /* Move to connecting socket, start sending Connect Requests */
699 sock->state = SS_CONNECTING;
700 sk->sk_state = TCP_SYN_SENT;
701
702 nr_establish_data_link(sk);
703
704 nr->state = NR_STATE_1;
705
706 nr_start_heartbeat(sk);
707
708 /* Now the loop */
709 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) {
710 err = -EINPROGRESS;
711 goto out_release;
712 }
713
714 /*
715 * A Connect Ack with Choke or timeout or failed routing will go to
716 * closed.
717 */
718 if (sk->sk_state == TCP_SYN_SENT) {
719 DEFINE_WAIT(wait);
720
721 for (;;) {
722 prepare_to_wait(sk->sk_sleep, &wait,
723 TASK_INTERRUPTIBLE);
724 if (sk->sk_state != TCP_SYN_SENT)
725 break;
726 if (!signal_pending(current)) {
727 release_sock(sk);
728 schedule();
729 lock_sock(sk);
730 continue;
731 }
732 err = -ERESTARTSYS;
733 break;
734 }
735 finish_wait(sk->sk_sleep, &wait);
736 if (err)
737 goto out_release;
738 }
739
740 if (sk->sk_state != TCP_ESTABLISHED) {
741 sock->state = SS_UNCONNECTED;
742 err = sock_error(sk); /* Always set at this point */
743 goto out_release;
744 }
745
746 sock->state = SS_CONNECTED;
747
748 out_release:
749 release_sock(sk);
750
751 return err;
752 }
753
754 static int nr_accept(struct socket *sock, struct socket *newsock, int flags)
755 {
756 struct sk_buff *skb;
757 struct sock *newsk;
758 DEFINE_WAIT(wait);
759 struct sock *sk;
760 int err = 0;
761
762 if ((sk = sock->sk) == NULL)
763 return -EINVAL;
764
765 lock_sock(sk);
766 if (sk->sk_type != SOCK_SEQPACKET) {
767 err = -EOPNOTSUPP;
768 goto out_release;
769 }
770
771 if (sk->sk_state != TCP_LISTEN) {
772 err = -EINVAL;
773 goto out_release;
774 }
775
776 /*
777 * The write queue this time is holding sockets ready to use
778 * hooked into the SABM we saved
779 */
780 for (;;) {
781 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
782 skb = skb_dequeue(&sk->sk_receive_queue);
783 if (skb)
784 break;
785
786 if (flags & O_NONBLOCK) {
787 err = -EWOULDBLOCK;
788 break;
789 }
790 if (!signal_pending(current)) {
791 release_sock(sk);
792 schedule();
793 lock_sock(sk);
794 continue;
795 }
796 err = -ERESTARTSYS;
797 break;
798 }
799 finish_wait(sk->sk_sleep, &wait);
800 if (err)
801 goto out_release;
802
803 newsk = skb->sk;
804 newsk->sk_socket = newsock;
805 newsk->sk_sleep = &newsock->wait;
806
807 /* Now attach up the new socket */
808 kfree_skb(skb);
809 sk_acceptq_removed(sk);
810 newsock->sk = newsk;
811
812 out_release:
813 release_sock(sk);
814
815 return err;
816 }
817
818 static int nr_getname(struct socket *sock, struct sockaddr *uaddr,
819 int *uaddr_len, int peer)
820 {
821 struct full_sockaddr_ax25 *sax = (struct full_sockaddr_ax25 *)uaddr;
822 struct sock *sk = sock->sk;
823 struct nr_sock *nr = nr_sk(sk);
824
825 lock_sock(sk);
826 if (peer != 0) {
827 if (sk->sk_state != TCP_ESTABLISHED) {
828 release_sock(sk);
829 return -ENOTCONN;
830 }
831 sax->fsa_ax25.sax25_family = AF_NETROM;
832 sax->fsa_ax25.sax25_ndigis = 1;
833 sax->fsa_ax25.sax25_call = nr->user_addr;
834 sax->fsa_digipeater[0] = nr->dest_addr;
835 *uaddr_len = sizeof(struct full_sockaddr_ax25);
836 } else {
837 sax->fsa_ax25.sax25_family = AF_NETROM;
838 sax->fsa_ax25.sax25_ndigis = 0;
839 sax->fsa_ax25.sax25_call = nr->source_addr;
840 *uaddr_len = sizeof(struct sockaddr_ax25);
841 }
842 release_sock(sk);
843
844 return 0;
845 }
846
847 int nr_rx_frame(struct sk_buff *skb, struct net_device *dev)
848 {
849 struct sock *sk;
850 struct sock *make;
851 struct nr_sock *nr_make;
852 ax25_address *src, *dest, *user;
853 unsigned short circuit_index, circuit_id;
854 unsigned short peer_circuit_index, peer_circuit_id;
855 unsigned short frametype, flags, window, timeout;
856 int ret;
857
858 skb->sk = NULL; /* Initially we don't know who it's for */
859
860 /*
861 * skb->data points to the netrom frame start
862 */
863
864 src = (ax25_address *)(skb->data + 0);
865 dest = (ax25_address *)(skb->data + 7);
866
867 circuit_index = skb->data[15];
868 circuit_id = skb->data[16];
869 peer_circuit_index = skb->data[17];
870 peer_circuit_id = skb->data[18];
871 frametype = skb->data[19] & 0x0F;
872 flags = skb->data[19] & 0xF0;
873
874 /*
875 * Check for an incoming IP over NET/ROM frame.
876 */
877 if (frametype == NR_PROTOEXT &&
878 circuit_index == NR_PROTO_IP && circuit_id == NR_PROTO_IP) {
879 skb_pull(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN);
880 skb_reset_transport_header(skb);
881
882 return nr_rx_ip(skb, dev);
883 }
884
885 /*
886 * Find an existing socket connection, based on circuit ID, if it's
887 * a Connect Request base it on their circuit ID.
888 *
889 * Circuit ID 0/0 is not valid but it could still be a "reset" for a
890 * circuit that no longer exists at the other end ...
891 */
892
893 sk = NULL;
894
895 if (circuit_index == 0 && circuit_id == 0) {
896 if (frametype == NR_CONNACK && flags == NR_CHOKE_FLAG)
897 sk = nr_find_peer(peer_circuit_index, peer_circuit_id, src);
898 } else {
899 if (frametype == NR_CONNREQ)
900 sk = nr_find_peer(circuit_index, circuit_id, src);
901 else
902 sk = nr_find_socket(circuit_index, circuit_id);
903 }
904
905 if (sk != NULL) {
906 skb_reset_transport_header(skb);
907
908 if (frametype == NR_CONNACK && skb->len == 22)
909 nr_sk(sk)->bpqext = 1;
910 else
911 nr_sk(sk)->bpqext = 0;
912
913 ret = nr_process_rx_frame(sk, skb);
914 bh_unlock_sock(sk);
915 return ret;
916 }
917
918 /*
919 * Now it should be a CONNREQ.
920 */
921 if (frametype != NR_CONNREQ) {
922 /*
923 * Here it would be nice to be able to send a reset but
924 * NET/ROM doesn't have one. We've tried to extend the protocol
925 * by sending NR_CONNACK | NR_CHOKE_FLAGS replies but that
926 * apparently kills BPQ boxes... :-(
927 * So now we try to follow the established behaviour of
928 * G8PZT's Xrouter which is sending packets with command type 7
929 * as an extension of the protocol.
930 */
931 if (sysctl_netrom_reset_circuit &&
932 (frametype != NR_RESET || flags != 0))
933 nr_transmit_reset(skb, 1);
934
935 return 0;
936 }
937
938 sk = nr_find_listener(dest);
939
940 user = (ax25_address *)(skb->data + 21);
941
942 if (sk == NULL || sk_acceptq_is_full(sk) ||
943 (make = nr_make_new(sk)) == NULL) {
944 nr_transmit_refusal(skb, 0);
945 if (sk)
946 bh_unlock_sock(sk);
947 return 0;
948 }
949
950 window = skb->data[20];
951
952 skb->sk = make;
953 make->sk_state = TCP_ESTABLISHED;
954
955 /* Fill in his circuit details */
956 nr_make = nr_sk(make);
957 nr_make->source_addr = *dest;
958 nr_make->dest_addr = *src;
959 nr_make->user_addr = *user;
960
961 nr_make->your_index = circuit_index;
962 nr_make->your_id = circuit_id;
963
964 bh_unlock_sock(sk);
965 circuit = nr_find_next_circuit();
966 bh_lock_sock(sk);
967
968 nr_make->my_index = circuit / 256;
969 nr_make->my_id = circuit % 256;
970
971 circuit++;
972
973 /* Window negotiation */
974 if (window < nr_make->window)
975 nr_make->window = window;
976
977 /* L4 timeout negotiation */
978 if (skb->len == 37) {
979 timeout = skb->data[36] * 256 + skb->data[35];
980 if (timeout * HZ < nr_make->t1)
981 nr_make->t1 = timeout * HZ;
982 nr_make->bpqext = 1;
983 } else {
984 nr_make->bpqext = 0;
985 }
986
987 nr_write_internal(make, NR_CONNACK);
988
989 nr_make->condition = 0x00;
990 nr_make->vs = 0;
991 nr_make->va = 0;
992 nr_make->vr = 0;
993 nr_make->vl = 0;
994 nr_make->state = NR_STATE_3;
995 sk_acceptq_added(sk);
996 skb_queue_head(&sk->sk_receive_queue, skb);
997
998 if (!sock_flag(sk, SOCK_DEAD))
999 sk->sk_data_ready(sk, skb->len);
1000
1001 bh_unlock_sock(sk);
1002
1003 nr_insert_socket(make);
1004
1005 nr_start_heartbeat(make);
1006 nr_start_idletimer(make);
1007
1008 return 1;
1009 }
1010
1011 static int nr_sendmsg(struct kiocb *iocb, struct socket *sock,
1012 struct msghdr *msg, size_t len)
1013 {
1014 struct sock *sk = sock->sk;
1015 struct nr_sock *nr = nr_sk(sk);
1016 struct sockaddr_ax25 *usax = (struct sockaddr_ax25 *)msg->msg_name;
1017 int err;
1018 struct sockaddr_ax25 sax;
1019 struct sk_buff *skb;
1020 unsigned char *asmptr;
1021 int size;
1022
1023 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT))
1024 return -EINVAL;
1025
1026 lock_sock(sk);
1027 if (sock_flag(sk, SOCK_ZAPPED)) {
1028 err = -EADDRNOTAVAIL;
1029 goto out;
1030 }
1031
1032 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1033 send_sig(SIGPIPE, current, 0);
1034 err = -EPIPE;
1035 goto out;
1036 }
1037
1038 if (nr->device == NULL) {
1039 err = -ENETUNREACH;
1040 goto out;
1041 }
1042
1043 if (usax) {
1044 if (msg->msg_namelen < sizeof(sax)) {
1045 err = -EINVAL;
1046 goto out;
1047 }
1048 sax = *usax;
1049 if (ax25cmp(&nr->dest_addr, &sax.sax25_call) != 0) {
1050 err = -EISCONN;
1051 goto out;
1052 }
1053 if (sax.sax25_family != AF_NETROM) {
1054 err = -EINVAL;
1055 goto out;
1056 }
1057 } else {
1058 if (sk->sk_state != TCP_ESTABLISHED) {
1059 err = -ENOTCONN;
1060 goto out;
1061 }
1062 sax.sax25_family = AF_NETROM;
1063 sax.sax25_call = nr->dest_addr;
1064 }
1065
1066 SOCK_DEBUG(sk, "NET/ROM: sendto: Addresses built.\n");
1067
1068 /* Build a packet */
1069 SOCK_DEBUG(sk, "NET/ROM: sendto: building packet.\n");
1070 size = len + NR_NETWORK_LEN + NR_TRANSPORT_LEN;
1071
1072 if ((skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL)
1073 goto out;
1074
1075 skb_reserve(skb, size - len);
1076 skb_reset_transport_header(skb);
1077
1078 /*
1079 * Push down the NET/ROM header
1080 */
1081
1082 asmptr = skb_push(skb, NR_TRANSPORT_LEN);
1083 SOCK_DEBUG(sk, "Building NET/ROM Header.\n");
1084
1085 /* Build a NET/ROM Transport header */
1086
1087 *asmptr++ = nr->your_index;
1088 *asmptr++ = nr->your_id;
1089 *asmptr++ = 0; /* To be filled in later */
1090 *asmptr++ = 0; /* Ditto */
1091 *asmptr++ = NR_INFO;
1092 SOCK_DEBUG(sk, "Built header.\n");
1093
1094 /*
1095 * Put the data on the end
1096 */
1097 skb_put(skb, len);
1098
1099 SOCK_DEBUG(sk, "NET/ROM: Appending user data\n");
1100
1101 /* User data follows immediately after the NET/ROM transport header */
1102 if (memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len)) {
1103 kfree_skb(skb);
1104 err = -EFAULT;
1105 goto out;
1106 }
1107
1108 SOCK_DEBUG(sk, "NET/ROM: Transmitting buffer\n");
1109
1110 if (sk->sk_state != TCP_ESTABLISHED) {
1111 kfree_skb(skb);
1112 err = -ENOTCONN;
1113 goto out;
1114 }
1115
1116 nr_output(sk, skb); /* Shove it onto the queue */
1117
1118 err = len;
1119 out:
1120 release_sock(sk);
1121 return err;
1122 }
1123
1124 static int nr_recvmsg(struct kiocb *iocb, struct socket *sock,
1125 struct msghdr *msg, size_t size, int flags)
1126 {
1127 struct sock *sk = sock->sk;
1128 struct sockaddr_ax25 *sax = (struct sockaddr_ax25 *)msg->msg_name;
1129 size_t copied;
1130 struct sk_buff *skb;
1131 int er;
1132
1133 /*
1134 * This works for seqpacket too. The receiver has ordered the queue for
1135 * us! We do one quick check first though
1136 */
1137
1138 lock_sock(sk);
1139 if (sk->sk_state != TCP_ESTABLISHED) {
1140 release_sock(sk);
1141 return -ENOTCONN;
1142 }
1143
1144 /* Now we can treat all alike */
1145 if ((skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, flags & MSG_DONTWAIT, &er)) == NULL) {
1146 release_sock(sk);
1147 return er;
1148 }
1149
1150 skb_reset_transport_header(skb);
1151 copied = skb->len;
1152
1153 if (copied > size) {
1154 copied = size;
1155 msg->msg_flags |= MSG_TRUNC;
1156 }
1157
1158 skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1159
1160 if (sax != NULL) {
1161 sax->sax25_family = AF_NETROM;
1162 skb_copy_from_linear_data_offset(skb, 7, sax->sax25_call.ax25_call,
1163 AX25_ADDR_LEN);
1164 }
1165
1166 msg->msg_namelen = sizeof(*sax);
1167
1168 skb_free_datagram(sk, skb);
1169
1170 release_sock(sk);
1171 return copied;
1172 }
1173
1174
1175 static int nr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1176 {
1177 struct sock *sk = sock->sk;
1178 void __user *argp = (void __user *)arg;
1179 int ret;
1180
1181 switch (cmd) {
1182 case TIOCOUTQ: {
1183 long amount;
1184
1185 lock_sock(sk);
1186 amount = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc);
1187 if (amount < 0)
1188 amount = 0;
1189 release_sock(sk);
1190 return put_user(amount, (int __user *)argp);
1191 }
1192
1193 case TIOCINQ: {
1194 struct sk_buff *skb;
1195 long amount = 0L;
1196
1197 lock_sock(sk);
1198 /* These two are safe on a single CPU system as only user tasks fiddle here */
1199 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1200 amount = skb->len;
1201 release_sock(sk);
1202 return put_user(amount, (int __user *)argp);
1203 }
1204
1205 case SIOCGSTAMP:
1206 lock_sock(sk);
1207 ret = sock_get_timestamp(sk, argp);
1208 release_sock(sk);
1209 return ret;
1210
1211 case SIOCGSTAMPNS:
1212 lock_sock(sk);
1213 ret = sock_get_timestampns(sk, argp);
1214 release_sock(sk);
1215 return ret;
1216
1217 case SIOCGIFADDR:
1218 case SIOCSIFADDR:
1219 case SIOCGIFDSTADDR:
1220 case SIOCSIFDSTADDR:
1221 case SIOCGIFBRDADDR:
1222 case SIOCSIFBRDADDR:
1223 case SIOCGIFNETMASK:
1224 case SIOCSIFNETMASK:
1225 case SIOCGIFMETRIC:
1226 case SIOCSIFMETRIC:
1227 return -EINVAL;
1228
1229 case SIOCADDRT:
1230 case SIOCDELRT:
1231 case SIOCNRDECOBS:
1232 if (!capable(CAP_NET_ADMIN)) return -EPERM;
1233 return nr_rt_ioctl(cmd, argp);
1234
1235 default:
1236 return -ENOIOCTLCMD;
1237 }
1238
1239 return 0;
1240 }
1241
1242 #ifdef CONFIG_PROC_FS
1243
1244 static void *nr_info_start(struct seq_file *seq, loff_t *pos)
1245 {
1246 struct sock *s;
1247 struct hlist_node *node;
1248 int i = 1;
1249
1250 spin_lock_bh(&nr_list_lock);
1251 if (*pos == 0)
1252 return SEQ_START_TOKEN;
1253
1254 sk_for_each(s, node, &nr_list) {
1255 if (i == *pos)
1256 return s;
1257 ++i;
1258 }
1259 return NULL;
1260 }
1261
1262 static void *nr_info_next(struct seq_file *seq, void *v, loff_t *pos)
1263 {
1264 ++*pos;
1265
1266 return (v == SEQ_START_TOKEN) ? sk_head(&nr_list)
1267 : sk_next((struct sock *)v);
1268 }
1269
1270 static void nr_info_stop(struct seq_file *seq, void *v)
1271 {
1272 spin_unlock_bh(&nr_list_lock);
1273 }
1274
1275 static int nr_info_show(struct seq_file *seq, void *v)
1276 {
1277 struct sock *s = v;
1278 struct net_device *dev;
1279 struct nr_sock *nr;
1280 const char *devname;
1281 char buf[11];
1282
1283 if (v == SEQ_START_TOKEN)
1284 seq_puts(seq,
1285 "user_addr dest_node src_node dev my your st vs vr va t1 t2 t4 idle n2 wnd Snd-Q Rcv-Q inode\n");
1286
1287 else {
1288
1289 bh_lock_sock(s);
1290 nr = nr_sk(s);
1291
1292 if ((dev = nr->device) == NULL)
1293 devname = "???";
1294 else
1295 devname = dev->name;
1296
1297 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->user_addr));
1298 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->dest_addr));
1299 seq_printf(seq,
1300 "%-9s %-3s %02X/%02X %02X/%02X %2d %3d %3d %3d %3lu/%03lu %2lu/%02lu %3lu/%03lu %3lu/%03lu %2d/%02d %3d %5d %5d %ld\n",
1301 ax2asc(buf, &nr->source_addr),
1302 devname,
1303 nr->my_index,
1304 nr->my_id,
1305 nr->your_index,
1306 nr->your_id,
1307 nr->state,
1308 nr->vs,
1309 nr->vr,
1310 nr->va,
1311 ax25_display_timer(&nr->t1timer) / HZ,
1312 nr->t1 / HZ,
1313 ax25_display_timer(&nr->t2timer) / HZ,
1314 nr->t2 / HZ,
1315 ax25_display_timer(&nr->t4timer) / HZ,
1316 nr->t4 / HZ,
1317 ax25_display_timer(&nr->idletimer) / (60 * HZ),
1318 nr->idle / (60 * HZ),
1319 nr->n2count,
1320 nr->n2,
1321 nr->window,
1322 atomic_read(&s->sk_wmem_alloc),
1323 atomic_read(&s->sk_rmem_alloc),
1324 s->sk_socket ? SOCK_INODE(s->sk_socket)->i_ino : 0L);
1325
1326 bh_unlock_sock(s);
1327 }
1328 return 0;
1329 }
1330
1331 static const struct seq_operations nr_info_seqops = {
1332 .start = nr_info_start,
1333 .next = nr_info_next,
1334 .stop = nr_info_stop,
1335 .show = nr_info_show,
1336 };
1337
1338 static int nr_info_open(struct inode *inode, struct file *file)
1339 {
1340 return seq_open(file, &nr_info_seqops);
1341 }
1342
1343 static const struct file_operations nr_info_fops = {
1344 .owner = THIS_MODULE,
1345 .open = nr_info_open,
1346 .read = seq_read,
1347 .llseek = seq_lseek,
1348 .release = seq_release,
1349 };
1350 #endif /* CONFIG_PROC_FS */
1351
1352 static struct net_proto_family nr_family_ops = {
1353 .family = PF_NETROM,
1354 .create = nr_create,
1355 .owner = THIS_MODULE,
1356 };
1357
1358 static const struct proto_ops nr_proto_ops = {
1359 .family = PF_NETROM,
1360 .owner = THIS_MODULE,
1361 .release = nr_release,
1362 .bind = nr_bind,
1363 .connect = nr_connect,
1364 .socketpair = sock_no_socketpair,
1365 .accept = nr_accept,
1366 .getname = nr_getname,
1367 .poll = datagram_poll,
1368 .ioctl = nr_ioctl,
1369 .listen = nr_listen,
1370 .shutdown = sock_no_shutdown,
1371 .setsockopt = nr_setsockopt,
1372 .getsockopt = nr_getsockopt,
1373 .sendmsg = nr_sendmsg,
1374 .recvmsg = nr_recvmsg,
1375 .mmap = sock_no_mmap,
1376 .sendpage = sock_no_sendpage,
1377 };
1378
1379 static struct notifier_block nr_dev_notifier = {
1380 .notifier_call = nr_device_event,
1381 };
1382
1383 static struct net_device **dev_nr;
1384
1385 static struct ax25_protocol nr_pid = {
1386 .pid = AX25_P_NETROM,
1387 .func = nr_route_frame
1388 };
1389
1390 static struct ax25_linkfail nr_linkfail_notifier = {
1391 .func = nr_link_failed,
1392 };
1393
1394 static int __init nr_proto_init(void)
1395 {
1396 int i;
1397 int rc = proto_register(&nr_proto, 0);
1398
1399 if (rc != 0)
1400 goto out;
1401
1402 if (nr_ndevs > 0x7fffffff/sizeof(struct net_device *)) {
1403 printk(KERN_ERR "NET/ROM: nr_proto_init - nr_ndevs parameter to large\n");
1404 return -1;
1405 }
1406
1407 dev_nr = kzalloc(nr_ndevs * sizeof(struct net_device *), GFP_KERNEL);
1408 if (dev_nr == NULL) {
1409 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device array\n");
1410 return -1;
1411 }
1412
1413 for (i = 0; i < nr_ndevs; i++) {
1414 char name[IFNAMSIZ];
1415 struct net_device *dev;
1416
1417 sprintf(name, "nr%d", i);
1418 dev = alloc_netdev(sizeof(struct nr_private), name, nr_setup);
1419 if (!dev) {
1420 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device structure\n");
1421 goto fail;
1422 }
1423
1424 dev->base_addr = i;
1425 if (register_netdev(dev)) {
1426 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register network device\n");
1427 free_netdev(dev);
1428 goto fail;
1429 }
1430 lockdep_set_class(&dev->_xmit_lock, &nr_netdev_xmit_lock_key);
1431 dev_nr[i] = dev;
1432 }
1433
1434 if (sock_register(&nr_family_ops)) {
1435 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register socket family\n");
1436 goto fail;
1437 }
1438
1439 register_netdevice_notifier(&nr_dev_notifier);
1440
1441 ax25_register_pid(&nr_pid);
1442 ax25_linkfail_register(&nr_linkfail_notifier);
1443
1444 #ifdef CONFIG_SYSCTL
1445 nr_register_sysctl();
1446 #endif
1447
1448 nr_loopback_init();
1449
1450 proc_net_fops_create("nr", S_IRUGO, &nr_info_fops);
1451 proc_net_fops_create("nr_neigh", S_IRUGO, &nr_neigh_fops);
1452 proc_net_fops_create("nr_nodes", S_IRUGO, &nr_nodes_fops);
1453 out:
1454 return rc;
1455 fail:
1456 while (--i >= 0) {
1457 unregister_netdev(dev_nr[i]);
1458 free_netdev(dev_nr[i]);
1459 }
1460 kfree(dev_nr);
1461 proto_unregister(&nr_proto);
1462 rc = -1;
1463 goto out;
1464 }
1465
1466 module_init(nr_proto_init);
1467
1468 module_param(nr_ndevs, int, 0);
1469 MODULE_PARM_DESC(nr_ndevs, "number of NET/ROM devices");
1470
1471 MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>");
1472 MODULE_DESCRIPTION("The amateur radio NET/ROM network and transport layer protocol");
1473 MODULE_LICENSE("GPL");
1474 MODULE_ALIAS_NETPROTO(PF_NETROM);
1475
1476 static void __exit nr_exit(void)
1477 {
1478 int i;
1479
1480 proc_net_remove("nr");
1481 proc_net_remove("nr_neigh");
1482 proc_net_remove("nr_nodes");
1483 nr_loopback_clear();
1484
1485 nr_rt_free();
1486
1487 #ifdef CONFIG_SYSCTL
1488 nr_unregister_sysctl();
1489 #endif
1490
1491 ax25_linkfail_release(&nr_linkfail_notifier);
1492 ax25_protocol_release(AX25_P_NETROM);
1493
1494 unregister_netdevice_notifier(&nr_dev_notifier);
1495
1496 sock_unregister(PF_NETROM);
1497
1498 for (i = 0; i < nr_ndevs; i++) {
1499 struct net_device *dev = dev_nr[i];
1500 if (dev) {
1501 unregister_netdev(dev);
1502 free_netdev(dev);
1503 }
1504 }
1505
1506 kfree(dev_nr);
1507 proto_unregister(&nr_proto);
1508 }
1509 module_exit(nr_exit);
USB Experimental Work