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netdev: Allocate multiple queues for TX.
[deliverable/linux.git] / net / netrom / af_netrom.c
1 /*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
6 *
7 * Copyright Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
8 * Copyright Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk)
9 * Copyright Darryl Miles G7LED (dlm@g7led.demon.co.uk)
10 */
11 #include <linux/module.h>
12 #include <linux/moduleparam.h>
13 #include <linux/capability.h>
14 #include <linux/errno.h>
15 #include <linux/types.h>
16 #include <linux/socket.h>
17 #include <linux/in.h>
18 #include <linux/kernel.h>
19 #include <linux/sched.h>
20 #include <linux/timer.h>
21 #include <linux/string.h>
22 #include <linux/sockios.h>
23 #include <linux/net.h>
24 #include <linux/stat.h>
25 #include <net/ax25.h>
26 #include <linux/inet.h>
27 #include <linux/netdevice.h>
28 #include <linux/if_arp.h>
29 #include <linux/skbuff.h>
30 #include <net/net_namespace.h>
31 #include <net/sock.h>
32 #include <asm/uaccess.h>
33 #include <asm/system.h>
34 #include <linux/fcntl.h>
35 #include <linux/termios.h> /* For TIOCINQ/OUTQ */
36 #include <linux/mm.h>
37 #include <linux/interrupt.h>
38 #include <linux/notifier.h>
39 #include <net/netrom.h>
40 #include <linux/proc_fs.h>
41 #include <linux/seq_file.h>
42 #include <net/ip.h>
43 #include <net/tcp_states.h>
44 #include <net/arp.h>
45 #include <linux/init.h>
46
47 static int nr_ndevs = 4;
48
49 int sysctl_netrom_default_path_quality = NR_DEFAULT_QUAL;
50 int sysctl_netrom_obsolescence_count_initialiser = NR_DEFAULT_OBS;
51 int sysctl_netrom_network_ttl_initialiser = NR_DEFAULT_TTL;
52 int sysctl_netrom_transport_timeout = NR_DEFAULT_T1;
53 int sysctl_netrom_transport_maximum_tries = NR_DEFAULT_N2;
54 int sysctl_netrom_transport_acknowledge_delay = NR_DEFAULT_T2;
55 int sysctl_netrom_transport_busy_delay = NR_DEFAULT_T4;
56 int sysctl_netrom_transport_requested_window_size = NR_DEFAULT_WINDOW;
57 int sysctl_netrom_transport_no_activity_timeout = NR_DEFAULT_IDLE;
58 int sysctl_netrom_routing_control = NR_DEFAULT_ROUTING;
59 int sysctl_netrom_link_fails_count = NR_DEFAULT_FAILS;
60 int sysctl_netrom_reset_circuit = NR_DEFAULT_RESET;
61
62 static unsigned short circuit = 0x101;
63
64 static HLIST_HEAD(nr_list);
65 static DEFINE_SPINLOCK(nr_list_lock);
66
67 static const struct proto_ops nr_proto_ops;
68
69 /*
70 * NETROM network devices are virtual network devices encapsulating NETROM
71 * frames into AX.25 which will be sent through an AX.25 device, so form a
72 * special "super class" of normal net devices; split their locks off into a
73 * separate class since they always nest.
74 */
75 static struct lock_class_key nr_netdev_xmit_lock_key;
76
77 static void nr_set_lockdep_one(struct net_device *dev,
78 struct netdev_queue *txq,
79 void *_unused)
80 {
81 lockdep_set_class(&txq->_xmit_lock, &nr_netdev_xmit_lock_key);
82 }
83
84 static void nr_set_lockdep_key(struct net_device *dev)
85 {
86 netdev_for_each_tx_queue(dev, nr_set_lockdep_one, NULL);
87 }
88
89 /*
90 * Socket removal during an interrupt is now safe.
91 */
92 static void nr_remove_socket(struct sock *sk)
93 {
94 spin_lock_bh(&nr_list_lock);
95 sk_del_node_init(sk);
96 spin_unlock_bh(&nr_list_lock);
97 }
98
99 /*
100 * Kill all bound sockets on a dropped device.
101 */
102 static void nr_kill_by_device(struct net_device *dev)
103 {
104 struct sock *s;
105 struct hlist_node *node;
106
107 spin_lock_bh(&nr_list_lock);
108 sk_for_each(s, node, &nr_list)
109 if (nr_sk(s)->device == dev)
110 nr_disconnect(s, ENETUNREACH);
111 spin_unlock_bh(&nr_list_lock);
112 }
113
114 /*
115 * Handle device status changes.
116 */
117 static int nr_device_event(struct notifier_block *this, unsigned long event, void *ptr)
118 {
119 struct net_device *dev = (struct net_device *)ptr;
120
121 if (dev_net(dev) != &init_net)
122 return NOTIFY_DONE;
123
124 if (event != NETDEV_DOWN)
125 return NOTIFY_DONE;
126
127 nr_kill_by_device(dev);
128 nr_rt_device_down(dev);
129
130 return NOTIFY_DONE;
131 }
132
133 /*
134 * Add a socket to the bound sockets list.
135 */
136 static void nr_insert_socket(struct sock *sk)
137 {
138 spin_lock_bh(&nr_list_lock);
139 sk_add_node(sk, &nr_list);
140 spin_unlock_bh(&nr_list_lock);
141 }
142
143 /*
144 * Find a socket that wants to accept the Connect Request we just
145 * received.
146 */
147 static struct sock *nr_find_listener(ax25_address *addr)
148 {
149 struct sock *s;
150 struct hlist_node *node;
151
152 spin_lock_bh(&nr_list_lock);
153 sk_for_each(s, node, &nr_list)
154 if (!ax25cmp(&nr_sk(s)->source_addr, addr) &&
155 s->sk_state == TCP_LISTEN) {
156 bh_lock_sock(s);
157 goto found;
158 }
159 s = NULL;
160 found:
161 spin_unlock_bh(&nr_list_lock);
162 return s;
163 }
164
165 /*
166 * Find a connected NET/ROM socket given my circuit IDs.
167 */
168 static struct sock *nr_find_socket(unsigned char index, unsigned char id)
169 {
170 struct sock *s;
171 struct hlist_node *node;
172
173 spin_lock_bh(&nr_list_lock);
174 sk_for_each(s, node, &nr_list) {
175 struct nr_sock *nr = nr_sk(s);
176
177 if (nr->my_index == index && nr->my_id == id) {
178 bh_lock_sock(s);
179 goto found;
180 }
181 }
182 s = NULL;
183 found:
184 spin_unlock_bh(&nr_list_lock);
185 return s;
186 }
187
188 /*
189 * Find a connected NET/ROM socket given their circuit IDs.
190 */
191 static struct sock *nr_find_peer(unsigned char index, unsigned char id,
192 ax25_address *dest)
193 {
194 struct sock *s;
195 struct hlist_node *node;
196
197 spin_lock_bh(&nr_list_lock);
198 sk_for_each(s, node, &nr_list) {
199 struct nr_sock *nr = nr_sk(s);
200
201 if (nr->your_index == index && nr->your_id == id &&
202 !ax25cmp(&nr->dest_addr, dest)) {
203 bh_lock_sock(s);
204 goto found;
205 }
206 }
207 s = NULL;
208 found:
209 spin_unlock_bh(&nr_list_lock);
210 return s;
211 }
212
213 /*
214 * Find next free circuit ID.
215 */
216 static unsigned short nr_find_next_circuit(void)
217 {
218 unsigned short id = circuit;
219 unsigned char i, j;
220 struct sock *sk;
221
222 for (;;) {
223 i = id / 256;
224 j = id % 256;
225
226 if (i != 0 && j != 0) {
227 if ((sk=nr_find_socket(i, j)) == NULL)
228 break;
229 bh_unlock_sock(sk);
230 }
231
232 id++;
233 }
234
235 return id;
236 }
237
238 /*
239 * Deferred destroy.
240 */
241 void nr_destroy_socket(struct sock *);
242
243 /*
244 * Handler for deferred kills.
245 */
246 static void nr_destroy_timer(unsigned long data)
247 {
248 struct sock *sk=(struct sock *)data;
249 bh_lock_sock(sk);
250 sock_hold(sk);
251 nr_destroy_socket(sk);
252 bh_unlock_sock(sk);
253 sock_put(sk);
254 }
255
256 /*
257 * This is called from user mode and the timers. Thus it protects itself
258 * against interrupt users but doesn't worry about being called during
259 * work. Once it is removed from the queue no interrupt or bottom half
260 * will touch it and we are (fairly 8-) ) safe.
261 */
262 void nr_destroy_socket(struct sock *sk)
263 {
264 struct sk_buff *skb;
265
266 nr_remove_socket(sk);
267
268 nr_stop_heartbeat(sk);
269 nr_stop_t1timer(sk);
270 nr_stop_t2timer(sk);
271 nr_stop_t4timer(sk);
272 nr_stop_idletimer(sk);
273
274 nr_clear_queues(sk); /* Flush the queues */
275
276 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
277 if (skb->sk != sk) { /* A pending connection */
278 /* Queue the unaccepted socket for death */
279 sock_set_flag(skb->sk, SOCK_DEAD);
280 nr_start_heartbeat(skb->sk);
281 nr_sk(skb->sk)->state = NR_STATE_0;
282 }
283
284 kfree_skb(skb);
285 }
286
287 if (atomic_read(&sk->sk_wmem_alloc) ||
288 atomic_read(&sk->sk_rmem_alloc)) {
289 /* Defer: outstanding buffers */
290 sk->sk_timer.function = nr_destroy_timer;
291 sk->sk_timer.expires = jiffies + 2 * HZ;
292 add_timer(&sk->sk_timer);
293 } else
294 sock_put(sk);
295 }
296
297 /*
298 * Handling for system calls applied via the various interfaces to a
299 * NET/ROM socket object.
300 */
301
302 static int nr_setsockopt(struct socket *sock, int level, int optname,
303 char __user *optval, int optlen)
304 {
305 struct sock *sk = sock->sk;
306 struct nr_sock *nr = nr_sk(sk);
307 int opt;
308
309 if (level != SOL_NETROM)
310 return -ENOPROTOOPT;
311
312 if (optlen < sizeof(int))
313 return -EINVAL;
314
315 if (get_user(opt, (int __user *)optval))
316 return -EFAULT;
317
318 switch (optname) {
319 case NETROM_T1:
320 if (opt < 1)
321 return -EINVAL;
322 nr->t1 = opt * HZ;
323 return 0;
324
325 case NETROM_T2:
326 if (opt < 1)
327 return -EINVAL;
328 nr->t2 = opt * HZ;
329 return 0;
330
331 case NETROM_N2:
332 if (opt < 1 || opt > 31)
333 return -EINVAL;
334 nr->n2 = opt;
335 return 0;
336
337 case NETROM_T4:
338 if (opt < 1)
339 return -EINVAL;
340 nr->t4 = opt * HZ;
341 return 0;
342
343 case NETROM_IDLE:
344 if (opt < 0)
345 return -EINVAL;
346 nr->idle = opt * 60 * HZ;
347 return 0;
348
349 default:
350 return -ENOPROTOOPT;
351 }
352 }
353
354 static int nr_getsockopt(struct socket *sock, int level, int optname,
355 char __user *optval, int __user *optlen)
356 {
357 struct sock *sk = sock->sk;
358 struct nr_sock *nr = nr_sk(sk);
359 int val = 0;
360 int len;
361
362 if (level != SOL_NETROM)
363 return -ENOPROTOOPT;
364
365 if (get_user(len, optlen))
366 return -EFAULT;
367
368 if (len < 0)
369 return -EINVAL;
370
371 switch (optname) {
372 case NETROM_T1:
373 val = nr->t1 / HZ;
374 break;
375
376 case NETROM_T2:
377 val = nr->t2 / HZ;
378 break;
379
380 case NETROM_N2:
381 val = nr->n2;
382 break;
383
384 case NETROM_T4:
385 val = nr->t4 / HZ;
386 break;
387
388 case NETROM_IDLE:
389 val = nr->idle / (60 * HZ);
390 break;
391
392 default:
393 return -ENOPROTOOPT;
394 }
395
396 len = min_t(unsigned int, len, sizeof(int));
397
398 if (put_user(len, optlen))
399 return -EFAULT;
400
401 return copy_to_user(optval, &val, len) ? -EFAULT : 0;
402 }
403
404 static int nr_listen(struct socket *sock, int backlog)
405 {
406 struct sock *sk = sock->sk;
407
408 lock_sock(sk);
409 if (sk->sk_state != TCP_LISTEN) {
410 memset(&nr_sk(sk)->user_addr, 0, AX25_ADDR_LEN);
411 sk->sk_max_ack_backlog = backlog;
412 sk->sk_state = TCP_LISTEN;
413 release_sock(sk);
414 return 0;
415 }
416 release_sock(sk);
417
418 return -EOPNOTSUPP;
419 }
420
421 static struct proto nr_proto = {
422 .name = "NETROM",
423 .owner = THIS_MODULE,
424 .obj_size = sizeof(struct nr_sock),
425 };
426
427 static int nr_create(struct net *net, struct socket *sock, int protocol)
428 {
429 struct sock *sk;
430 struct nr_sock *nr;
431
432 if (net != &init_net)
433 return -EAFNOSUPPORT;
434
435 if (sock->type != SOCK_SEQPACKET || protocol != 0)
436 return -ESOCKTNOSUPPORT;
437
438 sk = sk_alloc(net, PF_NETROM, GFP_ATOMIC, &nr_proto);
439 if (sk == NULL)
440 return -ENOMEM;
441
442 nr = nr_sk(sk);
443
444 sock_init_data(sock, sk);
445
446 sock->ops = &nr_proto_ops;
447 sk->sk_protocol = protocol;
448
449 skb_queue_head_init(&nr->ack_queue);
450 skb_queue_head_init(&nr->reseq_queue);
451 skb_queue_head_init(&nr->frag_queue);
452
453 nr_init_timers(sk);
454
455 nr->t1 =
456 msecs_to_jiffies(sysctl_netrom_transport_timeout);
457 nr->t2 =
458 msecs_to_jiffies(sysctl_netrom_transport_acknowledge_delay);
459 nr->n2 =
460 msecs_to_jiffies(sysctl_netrom_transport_maximum_tries);
461 nr->t4 =
462 msecs_to_jiffies(sysctl_netrom_transport_busy_delay);
463 nr->idle =
464 msecs_to_jiffies(sysctl_netrom_transport_no_activity_timeout);
465 nr->window = sysctl_netrom_transport_requested_window_size;
466
467 nr->bpqext = 1;
468 nr->state = NR_STATE_0;
469
470 return 0;
471 }
472
473 static struct sock *nr_make_new(struct sock *osk)
474 {
475 struct sock *sk;
476 struct nr_sock *nr, *onr;
477
478 if (osk->sk_type != SOCK_SEQPACKET)
479 return NULL;
480
481 sk = sk_alloc(sock_net(osk), PF_NETROM, GFP_ATOMIC, osk->sk_prot);
482 if (sk == NULL)
483 return NULL;
484
485 nr = nr_sk(sk);
486
487 sock_init_data(NULL, sk);
488
489 sk->sk_type = osk->sk_type;
490 sk->sk_priority = osk->sk_priority;
491 sk->sk_protocol = osk->sk_protocol;
492 sk->sk_rcvbuf = osk->sk_rcvbuf;
493 sk->sk_sndbuf = osk->sk_sndbuf;
494 sk->sk_state = TCP_ESTABLISHED;
495 sock_copy_flags(sk, osk);
496
497 skb_queue_head_init(&nr->ack_queue);
498 skb_queue_head_init(&nr->reseq_queue);
499 skb_queue_head_init(&nr->frag_queue);
500
501 nr_init_timers(sk);
502
503 onr = nr_sk(osk);
504
505 nr->t1 = onr->t1;
506 nr->t2 = onr->t2;
507 nr->n2 = onr->n2;
508 nr->t4 = onr->t4;
509 nr->idle = onr->idle;
510 nr->window = onr->window;
511
512 nr->device = onr->device;
513 nr->bpqext = onr->bpqext;
514
515 return sk;
516 }
517
518 static int nr_release(struct socket *sock)
519 {
520 struct sock *sk = sock->sk;
521 struct nr_sock *nr;
522
523 if (sk == NULL) return 0;
524
525 sock_hold(sk);
526 lock_sock(sk);
527 nr = nr_sk(sk);
528
529 switch (nr->state) {
530 case NR_STATE_0:
531 case NR_STATE_1:
532 case NR_STATE_2:
533 nr_disconnect(sk, 0);
534 nr_destroy_socket(sk);
535 break;
536
537 case NR_STATE_3:
538 nr_clear_queues(sk);
539 nr->n2count = 0;
540 nr_write_internal(sk, NR_DISCREQ);
541 nr_start_t1timer(sk);
542 nr_stop_t2timer(sk);
543 nr_stop_t4timer(sk);
544 nr_stop_idletimer(sk);
545 nr->state = NR_STATE_2;
546 sk->sk_state = TCP_CLOSE;
547 sk->sk_shutdown |= SEND_SHUTDOWN;
548 sk->sk_state_change(sk);
549 sock_orphan(sk);
550 sock_set_flag(sk, SOCK_DESTROY);
551 break;
552
553 default:
554 break;
555 }
556
557 sock->sk = NULL;
558 release_sock(sk);
559 sock_put(sk);
560
561 return 0;
562 }
563
564 static int nr_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
565 {
566 struct sock *sk = sock->sk;
567 struct nr_sock *nr = nr_sk(sk);
568 struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr;
569 struct net_device *dev;
570 ax25_uid_assoc *user;
571 ax25_address *source;
572
573 lock_sock(sk);
574 if (!sock_flag(sk, SOCK_ZAPPED)) {
575 release_sock(sk);
576 return -EINVAL;
577 }
578 if (addr_len < sizeof(struct sockaddr_ax25) || addr_len > sizeof(struct full_sockaddr_ax25)) {
579 release_sock(sk);
580 return -EINVAL;
581 }
582 if (addr_len < (addr->fsa_ax25.sax25_ndigis * sizeof(ax25_address) + sizeof(struct sockaddr_ax25))) {
583 release_sock(sk);
584 return -EINVAL;
585 }
586 if (addr->fsa_ax25.sax25_family != AF_NETROM) {
587 release_sock(sk);
588 return -EINVAL;
589 }
590 if ((dev = nr_dev_get(&addr->fsa_ax25.sax25_call)) == NULL) {
591 SOCK_DEBUG(sk, "NET/ROM: bind failed: invalid node callsign\n");
592 release_sock(sk);
593 return -EADDRNOTAVAIL;
594 }
595
596 /*
597 * Only the super user can set an arbitrary user callsign.
598 */
599 if (addr->fsa_ax25.sax25_ndigis == 1) {
600 if (!capable(CAP_NET_BIND_SERVICE)) {
601 dev_put(dev);
602 release_sock(sk);
603 return -EACCES;
604 }
605 nr->user_addr = addr->fsa_digipeater[0];
606 nr->source_addr = addr->fsa_ax25.sax25_call;
607 } else {
608 source = &addr->fsa_ax25.sax25_call;
609
610 user = ax25_findbyuid(current->euid);
611 if (user) {
612 nr->user_addr = user->call;
613 ax25_uid_put(user);
614 } else {
615 if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) {
616 release_sock(sk);
617 dev_put(dev);
618 return -EPERM;
619 }
620 nr->user_addr = *source;
621 }
622
623 nr->source_addr = *source;
624 }
625
626 nr->device = dev;
627 nr_insert_socket(sk);
628
629 sock_reset_flag(sk, SOCK_ZAPPED);
630 dev_put(dev);
631 release_sock(sk);
632 SOCK_DEBUG(sk, "NET/ROM: socket is bound\n");
633 return 0;
634 }
635
636 static int nr_connect(struct socket *sock, struct sockaddr *uaddr,
637 int addr_len, int flags)
638 {
639 struct sock *sk = sock->sk;
640 struct nr_sock *nr = nr_sk(sk);
641 struct sockaddr_ax25 *addr = (struct sockaddr_ax25 *)uaddr;
642 ax25_address *source = NULL;
643 ax25_uid_assoc *user;
644 struct net_device *dev;
645 int err = 0;
646
647 lock_sock(sk);
648 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
649 sock->state = SS_CONNECTED;
650 goto out_release; /* Connect completed during a ERESTARTSYS event */
651 }
652
653 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
654 sock->state = SS_UNCONNECTED;
655 err = -ECONNREFUSED;
656 goto out_release;
657 }
658
659 if (sk->sk_state == TCP_ESTABLISHED) {
660 err = -EISCONN; /* No reconnect on a seqpacket socket */
661 goto out_release;
662 }
663
664 sk->sk_state = TCP_CLOSE;
665 sock->state = SS_UNCONNECTED;
666
667 if (addr_len != sizeof(struct sockaddr_ax25) && addr_len != sizeof(struct full_sockaddr_ax25)) {
668 err = -EINVAL;
669 goto out_release;
670 }
671 if (addr->sax25_family != AF_NETROM) {
672 err = -EINVAL;
673 goto out_release;
674 }
675 if (sock_flag(sk, SOCK_ZAPPED)) { /* Must bind first - autobinding in this may or may not work */
676 sock_reset_flag(sk, SOCK_ZAPPED);
677
678 if ((dev = nr_dev_first()) == NULL) {
679 err = -ENETUNREACH;
680 goto out_release;
681 }
682 source = (ax25_address *)dev->dev_addr;
683
684 user = ax25_findbyuid(current->euid);
685 if (user) {
686 nr->user_addr = user->call;
687 ax25_uid_put(user);
688 } else {
689 if (ax25_uid_policy && !capable(CAP_NET_ADMIN)) {
690 dev_put(dev);
691 err = -EPERM;
692 goto out_release;
693 }
694 nr->user_addr = *source;
695 }
696
697 nr->source_addr = *source;
698 nr->device = dev;
699
700 dev_put(dev);
701 nr_insert_socket(sk); /* Finish the bind */
702 }
703
704 nr->dest_addr = addr->sax25_call;
705
706 release_sock(sk);
707 circuit = nr_find_next_circuit();
708 lock_sock(sk);
709
710 nr->my_index = circuit / 256;
711 nr->my_id = circuit % 256;
712
713 circuit++;
714
715 /* Move to connecting socket, start sending Connect Requests */
716 sock->state = SS_CONNECTING;
717 sk->sk_state = TCP_SYN_SENT;
718
719 nr_establish_data_link(sk);
720
721 nr->state = NR_STATE_1;
722
723 nr_start_heartbeat(sk);
724
725 /* Now the loop */
726 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) {
727 err = -EINPROGRESS;
728 goto out_release;
729 }
730
731 /*
732 * A Connect Ack with Choke or timeout or failed routing will go to
733 * closed.
734 */
735 if (sk->sk_state == TCP_SYN_SENT) {
736 DEFINE_WAIT(wait);
737
738 for (;;) {
739 prepare_to_wait(sk->sk_sleep, &wait,
740 TASK_INTERRUPTIBLE);
741 if (sk->sk_state != TCP_SYN_SENT)
742 break;
743 if (!signal_pending(current)) {
744 release_sock(sk);
745 schedule();
746 lock_sock(sk);
747 continue;
748 }
749 err = -ERESTARTSYS;
750 break;
751 }
752 finish_wait(sk->sk_sleep, &wait);
753 if (err)
754 goto out_release;
755 }
756
757 if (sk->sk_state != TCP_ESTABLISHED) {
758 sock->state = SS_UNCONNECTED;
759 err = sock_error(sk); /* Always set at this point */
760 goto out_release;
761 }
762
763 sock->state = SS_CONNECTED;
764
765 out_release:
766 release_sock(sk);
767
768 return err;
769 }
770
771 static int nr_accept(struct socket *sock, struct socket *newsock, int flags)
772 {
773 struct sk_buff *skb;
774 struct sock *newsk;
775 DEFINE_WAIT(wait);
776 struct sock *sk;
777 int err = 0;
778
779 if ((sk = sock->sk) == NULL)
780 return -EINVAL;
781
782 lock_sock(sk);
783 if (sk->sk_type != SOCK_SEQPACKET) {
784 err = -EOPNOTSUPP;
785 goto out_release;
786 }
787
788 if (sk->sk_state != TCP_LISTEN) {
789 err = -EINVAL;
790 goto out_release;
791 }
792
793 /*
794 * The write queue this time is holding sockets ready to use
795 * hooked into the SABM we saved
796 */
797 for (;;) {
798 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
799 skb = skb_dequeue(&sk->sk_receive_queue);
800 if (skb)
801 break;
802
803 if (flags & O_NONBLOCK) {
804 err = -EWOULDBLOCK;
805 break;
806 }
807 if (!signal_pending(current)) {
808 release_sock(sk);
809 schedule();
810 lock_sock(sk);
811 continue;
812 }
813 err = -ERESTARTSYS;
814 break;
815 }
816 finish_wait(sk->sk_sleep, &wait);
817 if (err)
818 goto out_release;
819
820 newsk = skb->sk;
821 sock_graft(newsk, newsock);
822
823 /* Now attach up the new socket */
824 kfree_skb(skb);
825 sk_acceptq_removed(sk);
826
827 out_release:
828 release_sock(sk);
829
830 return err;
831 }
832
833 static int nr_getname(struct socket *sock, struct sockaddr *uaddr,
834 int *uaddr_len, int peer)
835 {
836 struct full_sockaddr_ax25 *sax = (struct full_sockaddr_ax25 *)uaddr;
837 struct sock *sk = sock->sk;
838 struct nr_sock *nr = nr_sk(sk);
839
840 lock_sock(sk);
841 if (peer != 0) {
842 if (sk->sk_state != TCP_ESTABLISHED) {
843 release_sock(sk);
844 return -ENOTCONN;
845 }
846 sax->fsa_ax25.sax25_family = AF_NETROM;
847 sax->fsa_ax25.sax25_ndigis = 1;
848 sax->fsa_ax25.sax25_call = nr->user_addr;
849 sax->fsa_digipeater[0] = nr->dest_addr;
850 *uaddr_len = sizeof(struct full_sockaddr_ax25);
851 } else {
852 sax->fsa_ax25.sax25_family = AF_NETROM;
853 sax->fsa_ax25.sax25_ndigis = 0;
854 sax->fsa_ax25.sax25_call = nr->source_addr;
855 *uaddr_len = sizeof(struct sockaddr_ax25);
856 }
857 release_sock(sk);
858
859 return 0;
860 }
861
862 int nr_rx_frame(struct sk_buff *skb, struct net_device *dev)
863 {
864 struct sock *sk;
865 struct sock *make;
866 struct nr_sock *nr_make;
867 ax25_address *src, *dest, *user;
868 unsigned short circuit_index, circuit_id;
869 unsigned short peer_circuit_index, peer_circuit_id;
870 unsigned short frametype, flags, window, timeout;
871 int ret;
872
873 skb->sk = NULL; /* Initially we don't know who it's for */
874
875 /*
876 * skb->data points to the netrom frame start
877 */
878
879 src = (ax25_address *)(skb->data + 0);
880 dest = (ax25_address *)(skb->data + 7);
881
882 circuit_index = skb->data[15];
883 circuit_id = skb->data[16];
884 peer_circuit_index = skb->data[17];
885 peer_circuit_id = skb->data[18];
886 frametype = skb->data[19] & 0x0F;
887 flags = skb->data[19] & 0xF0;
888
889 /*
890 * Check for an incoming IP over NET/ROM frame.
891 */
892 if (frametype == NR_PROTOEXT &&
893 circuit_index == NR_PROTO_IP && circuit_id == NR_PROTO_IP) {
894 skb_pull(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN);
895 skb_reset_transport_header(skb);
896
897 return nr_rx_ip(skb, dev);
898 }
899
900 /*
901 * Find an existing socket connection, based on circuit ID, if it's
902 * a Connect Request base it on their circuit ID.
903 *
904 * Circuit ID 0/0 is not valid but it could still be a "reset" for a
905 * circuit that no longer exists at the other end ...
906 */
907
908 sk = NULL;
909
910 if (circuit_index == 0 && circuit_id == 0) {
911 if (frametype == NR_CONNACK && flags == NR_CHOKE_FLAG)
912 sk = nr_find_peer(peer_circuit_index, peer_circuit_id, src);
913 } else {
914 if (frametype == NR_CONNREQ)
915 sk = nr_find_peer(circuit_index, circuit_id, src);
916 else
917 sk = nr_find_socket(circuit_index, circuit_id);
918 }
919
920 if (sk != NULL) {
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 return ret;
931 }
932
933 /*
934 * Now it should be a CONNREQ.
935 */
936 if (frametype != NR_CONNREQ) {
937 /*
938 * Here it would be nice to be able to send a reset but
939 * NET/ROM doesn't have one. We've tried to extend the protocol
940 * by sending NR_CONNACK | NR_CHOKE_FLAGS replies but that
941 * apparently kills BPQ boxes... :-(
942 * So now we try to follow the established behaviour of
943 * G8PZT's Xrouter which is sending packets with command type 7
944 * as an extension of the protocol.
945 */
946 if (sysctl_netrom_reset_circuit &&
947 (frametype != NR_RESET || flags != 0))
948 nr_transmit_reset(skb, 1);
949
950 return 0;
951 }
952
953 sk = nr_find_listener(dest);
954
955 user = (ax25_address *)(skb->data + 21);
956
957 if (sk == NULL || sk_acceptq_is_full(sk) ||
958 (make = nr_make_new(sk)) == NULL) {
959 nr_transmit_refusal(skb, 0);
960 if (sk)
961 bh_unlock_sock(sk);
962 return 0;
963 }
964
965 window = skb->data[20];
966
967 skb->sk = make;
968 make->sk_state = TCP_ESTABLISHED;
969
970 /* Fill in his circuit details */
971 nr_make = nr_sk(make);
972 nr_make->source_addr = *dest;
973 nr_make->dest_addr = *src;
974 nr_make->user_addr = *user;
975
976 nr_make->your_index = circuit_index;
977 nr_make->your_id = circuit_id;
978
979 bh_unlock_sock(sk);
980 circuit = nr_find_next_circuit();
981 bh_lock_sock(sk);
982
983 nr_make->my_index = circuit / 256;
984 nr_make->my_id = circuit % 256;
985
986 circuit++;
987
988 /* Window negotiation */
989 if (window < nr_make->window)
990 nr_make->window = window;
991
992 /* L4 timeout negotiation */
993 if (skb->len == 37) {
994 timeout = skb->data[36] * 256 + skb->data[35];
995 if (timeout * HZ < nr_make->t1)
996 nr_make->t1 = timeout * HZ;
997 nr_make->bpqext = 1;
998 } else {
999 nr_make->bpqext = 0;
1000 }
1001
1002 nr_write_internal(make, NR_CONNACK);
1003
1004 nr_make->condition = 0x00;
1005 nr_make->vs = 0;
1006 nr_make->va = 0;
1007 nr_make->vr = 0;
1008 nr_make->vl = 0;
1009 nr_make->state = NR_STATE_3;
1010 sk_acceptq_added(sk);
1011 skb_queue_head(&sk->sk_receive_queue, skb);
1012
1013 if (!sock_flag(sk, SOCK_DEAD))
1014 sk->sk_data_ready(sk, skb->len);
1015
1016 bh_unlock_sock(sk);
1017
1018 nr_insert_socket(make);
1019
1020 nr_start_heartbeat(make);
1021 nr_start_idletimer(make);
1022
1023 return 1;
1024 }
1025
1026 static int nr_sendmsg(struct kiocb *iocb, struct socket *sock,
1027 struct msghdr *msg, size_t len)
1028 {
1029 struct sock *sk = sock->sk;
1030 struct nr_sock *nr = nr_sk(sk);
1031 struct sockaddr_ax25 *usax = (struct sockaddr_ax25 *)msg->msg_name;
1032 int err;
1033 struct sockaddr_ax25 sax;
1034 struct sk_buff *skb;
1035 unsigned char *asmptr;
1036 int size;
1037
1038 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT))
1039 return -EINVAL;
1040
1041 lock_sock(sk);
1042 if (sock_flag(sk, SOCK_ZAPPED)) {
1043 err = -EADDRNOTAVAIL;
1044 goto out;
1045 }
1046
1047 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1048 send_sig(SIGPIPE, current, 0);
1049 err = -EPIPE;
1050 goto out;
1051 }
1052
1053 if (nr->device == NULL) {
1054 err = -ENETUNREACH;
1055 goto out;
1056 }
1057
1058 if (usax) {
1059 if (msg->msg_namelen < sizeof(sax)) {
1060 err = -EINVAL;
1061 goto out;
1062 }
1063 sax = *usax;
1064 if (ax25cmp(&nr->dest_addr, &sax.sax25_call) != 0) {
1065 err = -EISCONN;
1066 goto out;
1067 }
1068 if (sax.sax25_family != AF_NETROM) {
1069 err = -EINVAL;
1070 goto out;
1071 }
1072 } else {
1073 if (sk->sk_state != TCP_ESTABLISHED) {
1074 err = -ENOTCONN;
1075 goto out;
1076 }
1077 sax.sax25_family = AF_NETROM;
1078 sax.sax25_call = nr->dest_addr;
1079 }
1080
1081 SOCK_DEBUG(sk, "NET/ROM: sendto: Addresses built.\n");
1082
1083 /* Build a packet */
1084 SOCK_DEBUG(sk, "NET/ROM: sendto: building packet.\n");
1085 size = len + NR_NETWORK_LEN + NR_TRANSPORT_LEN;
1086
1087 if ((skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL)
1088 goto out;
1089
1090 skb_reserve(skb, size - len);
1091 skb_reset_transport_header(skb);
1092
1093 /*
1094 * Push down the NET/ROM header
1095 */
1096
1097 asmptr = skb_push(skb, NR_TRANSPORT_LEN);
1098 SOCK_DEBUG(sk, "Building NET/ROM Header.\n");
1099
1100 /* Build a NET/ROM Transport header */
1101
1102 *asmptr++ = nr->your_index;
1103 *asmptr++ = nr->your_id;
1104 *asmptr++ = 0; /* To be filled in later */
1105 *asmptr++ = 0; /* Ditto */
1106 *asmptr++ = NR_INFO;
1107 SOCK_DEBUG(sk, "Built header.\n");
1108
1109 /*
1110 * Put the data on the end
1111 */
1112 skb_put(skb, len);
1113
1114 SOCK_DEBUG(sk, "NET/ROM: Appending user data\n");
1115
1116 /* User data follows immediately after the NET/ROM transport header */
1117 if (memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len)) {
1118 kfree_skb(skb);
1119 err = -EFAULT;
1120 goto out;
1121 }
1122
1123 SOCK_DEBUG(sk, "NET/ROM: Transmitting buffer\n");
1124
1125 if (sk->sk_state != TCP_ESTABLISHED) {
1126 kfree_skb(skb);
1127 err = -ENOTCONN;
1128 goto out;
1129 }
1130
1131 nr_output(sk, skb); /* Shove it onto the queue */
1132
1133 err = len;
1134 out:
1135 release_sock(sk);
1136 return err;
1137 }
1138
1139 static int nr_recvmsg(struct kiocb *iocb, struct socket *sock,
1140 struct msghdr *msg, size_t size, int flags)
1141 {
1142 struct sock *sk = sock->sk;
1143 struct sockaddr_ax25 *sax = (struct sockaddr_ax25 *)msg->msg_name;
1144 size_t copied;
1145 struct sk_buff *skb;
1146 int er;
1147
1148 /*
1149 * This works for seqpacket too. The receiver has ordered the queue for
1150 * us! We do one quick check first though
1151 */
1152
1153 lock_sock(sk);
1154 if (sk->sk_state != TCP_ESTABLISHED) {
1155 release_sock(sk);
1156 return -ENOTCONN;
1157 }
1158
1159 /* Now we can treat all alike */
1160 if ((skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, flags & MSG_DONTWAIT, &er)) == NULL) {
1161 release_sock(sk);
1162 return er;
1163 }
1164
1165 skb_reset_transport_header(skb);
1166 copied = skb->len;
1167
1168 if (copied > size) {
1169 copied = size;
1170 msg->msg_flags |= MSG_TRUNC;
1171 }
1172
1173 skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1174
1175 if (sax != NULL) {
1176 sax->sax25_family = AF_NETROM;
1177 skb_copy_from_linear_data_offset(skb, 7, sax->sax25_call.ax25_call,
1178 AX25_ADDR_LEN);
1179 }
1180
1181 msg->msg_namelen = sizeof(*sax);
1182
1183 skb_free_datagram(sk, skb);
1184
1185 release_sock(sk);
1186 return copied;
1187 }
1188
1189
1190 static int nr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1191 {
1192 struct sock *sk = sock->sk;
1193 void __user *argp = (void __user *)arg;
1194 int ret;
1195
1196 switch (cmd) {
1197 case TIOCOUTQ: {
1198 long amount;
1199
1200 lock_sock(sk);
1201 amount = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc);
1202 if (amount < 0)
1203 amount = 0;
1204 release_sock(sk);
1205 return put_user(amount, (int __user *)argp);
1206 }
1207
1208 case TIOCINQ: {
1209 struct sk_buff *skb;
1210 long amount = 0L;
1211
1212 lock_sock(sk);
1213 /* These two are safe on a single CPU system as only user tasks fiddle here */
1214 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1215 amount = skb->len;
1216 release_sock(sk);
1217 return put_user(amount, (int __user *)argp);
1218 }
1219
1220 case SIOCGSTAMP:
1221 lock_sock(sk);
1222 ret = sock_get_timestamp(sk, argp);
1223 release_sock(sk);
1224 return ret;
1225
1226 case SIOCGSTAMPNS:
1227 lock_sock(sk);
1228 ret = sock_get_timestampns(sk, argp);
1229 release_sock(sk);
1230 return ret;
1231
1232 case SIOCGIFADDR:
1233 case SIOCSIFADDR:
1234 case SIOCGIFDSTADDR:
1235 case SIOCSIFDSTADDR:
1236 case SIOCGIFBRDADDR:
1237 case SIOCSIFBRDADDR:
1238 case SIOCGIFNETMASK:
1239 case SIOCSIFNETMASK:
1240 case SIOCGIFMETRIC:
1241 case SIOCSIFMETRIC:
1242 return -EINVAL;
1243
1244 case SIOCADDRT:
1245 case SIOCDELRT:
1246 case SIOCNRDECOBS:
1247 if (!capable(CAP_NET_ADMIN)) return -EPERM;
1248 return nr_rt_ioctl(cmd, argp);
1249
1250 default:
1251 return -ENOIOCTLCMD;
1252 }
1253
1254 return 0;
1255 }
1256
1257 #ifdef CONFIG_PROC_FS
1258
1259 static void *nr_info_start(struct seq_file *seq, loff_t *pos)
1260 {
1261 struct sock *s;
1262 struct hlist_node *node;
1263 int i = 1;
1264
1265 spin_lock_bh(&nr_list_lock);
1266 if (*pos == 0)
1267 return SEQ_START_TOKEN;
1268
1269 sk_for_each(s, node, &nr_list) {
1270 if (i == *pos)
1271 return s;
1272 ++i;
1273 }
1274 return NULL;
1275 }
1276
1277 static void *nr_info_next(struct seq_file *seq, void *v, loff_t *pos)
1278 {
1279 ++*pos;
1280
1281 return (v == SEQ_START_TOKEN) ? sk_head(&nr_list)
1282 : sk_next((struct sock *)v);
1283 }
1284
1285 static void nr_info_stop(struct seq_file *seq, void *v)
1286 {
1287 spin_unlock_bh(&nr_list_lock);
1288 }
1289
1290 static int nr_info_show(struct seq_file *seq, void *v)
1291 {
1292 struct sock *s = v;
1293 struct net_device *dev;
1294 struct nr_sock *nr;
1295 const char *devname;
1296 char buf[11];
1297
1298 if (v == SEQ_START_TOKEN)
1299 seq_puts(seq,
1300 "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");
1301
1302 else {
1303
1304 bh_lock_sock(s);
1305 nr = nr_sk(s);
1306
1307 if ((dev = nr->device) == NULL)
1308 devname = "???";
1309 else
1310 devname = dev->name;
1311
1312 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->user_addr));
1313 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->dest_addr));
1314 seq_printf(seq,
1315 "%-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",
1316 ax2asc(buf, &nr->source_addr),
1317 devname,
1318 nr->my_index,
1319 nr->my_id,
1320 nr->your_index,
1321 nr->your_id,
1322 nr->state,
1323 nr->vs,
1324 nr->vr,
1325 nr->va,
1326 ax25_display_timer(&nr->t1timer) / HZ,
1327 nr->t1 / HZ,
1328 ax25_display_timer(&nr->t2timer) / HZ,
1329 nr->t2 / HZ,
1330 ax25_display_timer(&nr->t4timer) / HZ,
1331 nr->t4 / HZ,
1332 ax25_display_timer(&nr->idletimer) / (60 * HZ),
1333 nr->idle / (60 * HZ),
1334 nr->n2count,
1335 nr->n2,
1336 nr->window,
1337 atomic_read(&s->sk_wmem_alloc),
1338 atomic_read(&s->sk_rmem_alloc),
1339 s->sk_socket ? SOCK_INODE(s->sk_socket)->i_ino : 0L);
1340
1341 bh_unlock_sock(s);
1342 }
1343 return 0;
1344 }
1345
1346 static const struct seq_operations nr_info_seqops = {
1347 .start = nr_info_start,
1348 .next = nr_info_next,
1349 .stop = nr_info_stop,
1350 .show = nr_info_show,
1351 };
1352
1353 static int nr_info_open(struct inode *inode, struct file *file)
1354 {
1355 return seq_open(file, &nr_info_seqops);
1356 }
1357
1358 static const struct file_operations nr_info_fops = {
1359 .owner = THIS_MODULE,
1360 .open = nr_info_open,
1361 .read = seq_read,
1362 .llseek = seq_lseek,
1363 .release = seq_release,
1364 };
1365 #endif /* CONFIG_PROC_FS */
1366
1367 static struct net_proto_family nr_family_ops = {
1368 .family = PF_NETROM,
1369 .create = nr_create,
1370 .owner = THIS_MODULE,
1371 };
1372
1373 static const struct proto_ops nr_proto_ops = {
1374 .family = PF_NETROM,
1375 .owner = THIS_MODULE,
1376 .release = nr_release,
1377 .bind = nr_bind,
1378 .connect = nr_connect,
1379 .socketpair = sock_no_socketpair,
1380 .accept = nr_accept,
1381 .getname = nr_getname,
1382 .poll = datagram_poll,
1383 .ioctl = nr_ioctl,
1384 .listen = nr_listen,
1385 .shutdown = sock_no_shutdown,
1386 .setsockopt = nr_setsockopt,
1387 .getsockopt = nr_getsockopt,
1388 .sendmsg = nr_sendmsg,
1389 .recvmsg = nr_recvmsg,
1390 .mmap = sock_no_mmap,
1391 .sendpage = sock_no_sendpage,
1392 };
1393
1394 static struct notifier_block nr_dev_notifier = {
1395 .notifier_call = nr_device_event,
1396 };
1397
1398 static struct net_device **dev_nr;
1399
1400 static struct ax25_protocol nr_pid = {
1401 .pid = AX25_P_NETROM,
1402 .func = nr_route_frame
1403 };
1404
1405 static struct ax25_linkfail nr_linkfail_notifier = {
1406 .func = nr_link_failed,
1407 };
1408
1409 static int __init nr_proto_init(void)
1410 {
1411 int i;
1412 int rc = proto_register(&nr_proto, 0);
1413
1414 if (rc != 0)
1415 goto out;
1416
1417 if (nr_ndevs > 0x7fffffff/sizeof(struct net_device *)) {
1418 printk(KERN_ERR "NET/ROM: nr_proto_init - nr_ndevs parameter to large\n");
1419 return -1;
1420 }
1421
1422 dev_nr = kzalloc(nr_ndevs * sizeof(struct net_device *), GFP_KERNEL);
1423 if (dev_nr == NULL) {
1424 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device array\n");
1425 return -1;
1426 }
1427
1428 for (i = 0; i < nr_ndevs; i++) {
1429 char name[IFNAMSIZ];
1430 struct net_device *dev;
1431
1432 sprintf(name, "nr%d", i);
1433 dev = alloc_netdev(sizeof(struct nr_private), name, nr_setup);
1434 if (!dev) {
1435 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device structure\n");
1436 goto fail;
1437 }
1438
1439 dev->base_addr = i;
1440 if (register_netdev(dev)) {
1441 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register network device\n");
1442 free_netdev(dev);
1443 goto fail;
1444 }
1445 nr_set_lockdep_key(dev);
1446 dev_nr[i] = dev;
1447 }
1448
1449 if (sock_register(&nr_family_ops)) {
1450 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register socket family\n");
1451 goto fail;
1452 }
1453
1454 register_netdevice_notifier(&nr_dev_notifier);
1455
1456 ax25_register_pid(&nr_pid);
1457 ax25_linkfail_register(&nr_linkfail_notifier);
1458
1459 #ifdef CONFIG_SYSCTL
1460 nr_register_sysctl();
1461 #endif
1462
1463 nr_loopback_init();
1464
1465 proc_net_fops_create(&init_net, "nr", S_IRUGO, &nr_info_fops);
1466 proc_net_fops_create(&init_net, "nr_neigh", S_IRUGO, &nr_neigh_fops);
1467 proc_net_fops_create(&init_net, "nr_nodes", S_IRUGO, &nr_nodes_fops);
1468 out:
1469 return rc;
1470 fail:
1471 while (--i >= 0) {
1472 unregister_netdev(dev_nr[i]);
1473 free_netdev(dev_nr[i]);
1474 }
1475 kfree(dev_nr);
1476 proto_unregister(&nr_proto);
1477 rc = -1;
1478 goto out;
1479 }
1480
1481 module_init(nr_proto_init);
1482
1483 module_param(nr_ndevs, int, 0);
1484 MODULE_PARM_DESC(nr_ndevs, "number of NET/ROM devices");
1485
1486 MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>");
1487 MODULE_DESCRIPTION("The amateur radio NET/ROM network and transport layer protocol");
1488 MODULE_LICENSE("GPL");
1489 MODULE_ALIAS_NETPROTO(PF_NETROM);
1490
1491 static void __exit nr_exit(void)
1492 {
1493 int i;
1494
1495 proc_net_remove(&init_net, "nr");
1496 proc_net_remove(&init_net, "nr_neigh");
1497 proc_net_remove(&init_net, "nr_nodes");
1498 nr_loopback_clear();
1499
1500 nr_rt_free();
1501
1502 #ifdef CONFIG_SYSCTL
1503 nr_unregister_sysctl();
1504 #endif
1505
1506 ax25_linkfail_release(&nr_linkfail_notifier);
1507 ax25_protocol_release(AX25_P_NETROM);
1508
1509 unregister_netdevice_notifier(&nr_dev_notifier);
1510
1511 sock_unregister(PF_NETROM);
1512
1513 for (i = 0; i < nr_ndevs; i++) {
1514 struct net_device *dev = dev_nr[i];
1515 if (dev) {
1516 unregister_netdev(dev);
1517 free_netdev(dev);
1518 }
1519 }
1520
1521 kfree(dev_nr);
1522 proto_unregister(&nr_proto);
1523 }
1524 module_exit(nr_exit);
Linux kernel - Deliverables
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