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/*
 *	NET/ROM release 006
 *
 *	This code REQUIRES 1.2.1 or higher/ NET3.029
 *
 *	This module:
 *		This module is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 *
 *	History
 *	NET/ROM 006	Tomi(OH2BNS)	Created this file.
 *					Changed the way the loopback
 *					queue is consumed.
 *
 */
 
#include <linux/config.h>
#if defined(CONFIG_NETROM) || defined(CONFIG_NETROM_MODULE)
#include <linux/types.h>
#include <linux/timer.h>
#include <net/ax25.h>
#include <linux/skbuff.h>
#include <net/netrom.h>
 
static struct sk_buff_head loopback_queue;
static struct timer_list loopback_timer;
 
static void nr_set_loopback_timer(void);
 
void nr_loopback_init(void)
{
	skb_queue_head_init(&loopback_queue);
 
	init_timer(&loopback_timer);
}
 
void nr_loopback_clear(void)
{
	struct sk_buff *skb;
 
	del_timer(&loopback_timer);
 
	while ((skb = skb_dequeue(&loopback_queue)) != NULL)
		kfree_skb(skb, FREE_READ);
}
 
static int nr_loopback_running(void)
{
	return (loopback_timer.prev != NULL || loopback_timer.next != NULL);
}
 
int nr_loopback_queue(struct sk_buff *skb)
{
	struct sk_buff *skbn;
 
	skbn = skb_clone(skb, GFP_ATOMIC);
 
	kfree_skb(skb, FREE_WRITE);
 
	if (skbn != NULL) {
		skb_queue_tail(&loopback_queue, skbn);
 
		if (!nr_loopback_running())
			nr_set_loopback_timer();
	}
 
	return 1;
}
 
static void nr_loopback_timer(unsigned long);
 
static void nr_set_loopback_timer(void)
{
	del_timer(&loopback_timer);
 
	loopback_timer.data     = 0;
	loopback_timer.function = &nr_loopback_timer;
	loopback_timer.expires  = jiffies + 10;
 
	add_timer(&loopback_timer);
}
 
static void nr_loopback_timer(unsigned long param)
{
	struct sk_buff *skb;
	ax25_address *nr_dest;
	struct device *dev;
 
	if ((skb = skb_dequeue(&loopback_queue)) != NULL) {
		nr_dest = (ax25_address *)(skb->data + 7);
 
		dev = nr_dev_get(nr_dest);
 
		if (dev == NULL || nr_rx_frame(skb, dev) == 0)
			kfree_skb(skb, FREE_READ);
 
		if (!skb_queue_empty(&loopback_queue) && !nr_loopback_running())
			nr_set_loopback_timer();
	}
}
 
#endif