/***************************************************************************                          packet_out.c  -  description                             -------------------    begin                : Mon Aug 4 2003    copyright            : (C) 2003 by Luke Klein-Berndt    email                : kleinb@nist.gov ***************************************************************************/#include "packet_out.h"extern u_int32_t g_broadcast_ip;extern u_int32_t g_my_ip;extern u_int8_t g_aodv_gateway;unsigned int output_handler(unsigned int hooknum, struct sk_buff **skb,                            const struct net_device *in, const struct net_device *out, int (*okfn) (struct sk_buff *)){    struct iphdr *ip= (*skb)->nh.iph;    struct net_device *dev= (*skb)->dev;    aodv_route *tmp_route;		aodv_neigh *tmp_neigh;    void *p = (uint32_t *) ip + ip->ihl;    struct udphdr *udp = p; //(struct udphdr *) ip + ip->ihl;    struct ethhdr *mac = (*skb)->mac.ethernet;  //Thanks to Randy Pitz for adding this extra check...	    if (ip->daddr == g_broadcast_ip)    {        return NF_ACCEPT;    }    //Need this additional check, otherwise users on the    //gateway will not be able to access the externel     //network. Remote user located outside the aodv_subnet    //also require this check if they are access services on    //the gateway node. 28 April 2004 pb     if(g_aodv_gateway && !aodv_subnet_test(ip->daddr))    {        return NF_ACCEPT;    }	    //Try to get a route to the destination    tmp_route = find_aodv_route(ip->daddr);    if ((tmp_route == NULL) || !(tmp_route->route_valid))    {        gen_rreq(g_my_ip, ip->daddr);        return NF_QUEUE;    }    if ((tmp_route != NULL) && (tmp_route->route_valid))        //Found after an LONG search by Jon Anderson    {				if (!tmp_route->self_route)        tmp_route->lifetime =  getcurrtime() + ACTIVE_ROUTE_TIMEOUT;    }        return NF_ACCEPT;}