/* * 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) {		memcpy(skb_put(skbn, skb->len), skb->data, skb->len);		skbn->h.raw = skbn->data; 		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);}