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> #include <linux/delay.h>
> #include <linux/reboot.h>
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> /*
>  * icmp_reboot
>  *	- this is an early implementation of simple way to reboot
>  *		the system at kernel level if the gets inaccessible
>  *		and you can not reboot it other way
>  *		This might occur for example whe trying new kernel
>  *		and this fails to load...
>  *	Howto:
>  *	This feature introduces new kernel parameter 
>  *			icmp_reboot=<bool>
>  *		that enables/disables this function at boot time (later will
>  *		be added an sysctl key to allow disabling this feature in
>  *		runtime)
>  *	When this feature is enabled kernel reboot when it receives ICMP_ADDRESS
>  *	icmp message (at this time no restrictions to this packet are used
>  *	so anybody can reboot you...)
>  *	
>  */
> 
> /*link sys_sync*/
> asmlinkage void sys_sync(void);	/* it's really int */
> 
> /*setup icmp reboot kiss*/
> int	icmp_reboot	= 0;
> static int __init icmp_reboot_config_setup(char *str)
> {
> 	icmp_reboot = simple_strtoul(str, NULL, 0);
> 	return 1;
> }
> __setup("icmp_reboot=", icmp_reboot_config_setup);
> 
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> 	if (icmp_reboot == 1)
> 	{	
> 		extern int panic_timeout;
> 
> 		/*if enabled icmp reboot, do it invoke panic()*/
> 		if(panic_timeout	== 0)
> 			panic_timeout	= 5;	/*if timeout not set*/
> 		panic("Received icmp reboot kiss...");
> 		/*here we get never*/
> 	}