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 Tomi Manninen OH2BNS (oh2bns@sral.fi)
8 */
9#include <linux/types.h>
10#include <linux/slab.h>
11#include <linux/socket.h>
12#include <linux/timer.h>
13#include <net/ax25.h>
14#include <linux/skbuff.h>
15#include <net/netrom.h>
16#include <linux/init.h>
17
18static void nr_loopback_timer(unsigned long);
19
20static struct sk_buff_head loopback_queue;
21static DEFINE_TIMER(loopback_timer, nr_loopback_timer, 0, 0);
22
23void __init nr_loopback_init(void)
24{
25	skb_queue_head_init(&loopback_queue);
26}
27
28static inline int nr_loopback_running(void)
29{
30	return timer_pending(&loopback_timer);
31}
32
33int nr_loopback_queue(struct sk_buff *skb)
34{
35	struct sk_buff *skbn;
36
37	if ((skbn = alloc_skb(skb->len, GFP_ATOMIC)) != NULL) {
38		skb_copy_from_linear_data(skb, skb_put(skbn, skb->len), skb->len);
39		skb_reset_transport_header(skbn);
40
41		skb_queue_tail(&loopback_queue, skbn);
42
43		if (!nr_loopback_running())
44			mod_timer(&loopback_timer, jiffies + 10);
45	}
46
47	kfree_skb(skb);
48	return 1;
49}
50
51static void nr_loopback_timer(unsigned long param)
52{
53	struct sk_buff *skb;
54	ax25_address *nr_dest;
55	struct net_device *dev;
56
57	if ((skb = skb_dequeue(&loopback_queue)) != NULL) {
58		nr_dest = (ax25_address *)(skb->data + 7);
59
60		dev = nr_dev_get(nr_dest);
61
62		if (dev == NULL || nr_rx_frame(skb, dev) == 0)
63			kfree_skb(skb);
64
65		if (dev != NULL)
66			dev_put(dev);
67
68		if (!skb_queue_empty(&loopback_queue) && !nr_loopback_running())
69			mod_timer(&loopback_timer, jiffies + 10);
70	}
71}
72
73void __exit nr_loopback_clear(void)
74{
75	del_timer_sync(&loopback_timer);
76	skb_queue_purge(&loopback_queue);
77}
78