nr_loopback.c

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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 ([email protected])
 */
#include <linux/types.h>
#include <linux/slab.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);
}