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/*

 * This program 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.

 *

 * Copyright Tomi Manninen OH2BNS (oh2bns@sral.fi)

 */

#include <linux/types.h>

#include <linux/socket.h>

#include <linux/timer.h>

#include <net/ax25.h>

#include <linux/skbuff.h>

#include <net/netrom.h>

#include <linux/init.h>

static void nr_loopback_timer(unsigned long);

static struct sk_buff_head loopback_queue;

static DEFINE_TIMER(loopback_timer, nr_loopback_timer, 0, 0);

void __init nr_loopback_init(void)

{

        skb_queue_head_init(&loopback_queue);

}

static inline int nr_loopback_running(void)

{

        return timer_pending(&loopback_timer);

}

int nr_loopback_queue(struct sk_buff *skb)

{

        struct sk_buff *skbn;

        if ((skbn = alloc_skb(skb->len, GFP_ATOMIC)) != NULL) {

                skb_copy_from_linear_data(skb, skb_put(skbn, skb->len), skb->len);

                skb_reset_transport_header(skbn);

                skb_queue_tail(&loopback_queue, skbn);

                if (!nr_loopback_running())

                        mod_timer(&loopback_timer, jiffies + 10);

        }

        kfree_skb(skb);

        return 1;

}

static void nr_loopback_timer(unsigned long param)

{

        struct sk_buff *skb;

        ax25_address *nr_dest;

        struct net_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);

                if (dev != NULL)

                        dev_put(dev);

                if (!skb_queue_empty(&loopback_queue) && !nr_loopback_running())

                        mod_timer(&loopback_timer, jiffies + 10);

        }

}

void __exit nr_loopback_clear(void)

{

        del_timer_sync(&loopback_timer);

        skb_queue_purge(&loopback_queue);

}