/***************************************************************************                          kernel_route.c  -  description                             -------------------    begin                : Fri Aug 8 2003    copyright            : (C) 2003 by Luke Klein-Berndt    email                : kleinb@nist.gov ***************************************************************************/#include "kernel_route.h"extern u_int32_t g_broadcast_ip;struct rtentry *create_kernel_route_entry(u_int32_t dst_ip, u_int32_t gw_ip, u_int32_t genmask_ip, char *interf){    struct rtentry *new_rtentry;    struct sockaddr_in dst;    struct sockaddr_in gw;    struct sockaddr_in genmask;    if ((new_rtentry = kmalloc(sizeof(struct rtentry), GFP_ATOMIC)) == NULL)    {        printk("KRTABLE: Gen- Error generating a route entry\n");        return NULL;            /* Malloc failed */    }    dst.sin_family = AF_INET;    gw.sin_family = AF_INET;    genmask.sin_family = AF_INET;//    dst.sin_addr.s_addr = dst_ip;    dst.sin_addr.s_addr = dst_ip & genmask_ip;//JPA/*    if (gw_ip == dst_ip)        gw.sin_addr.s_addr = 0;    else*/        gw.sin_addr.s_addr = gw_ip;//gw.sin_addr.s_addr = 0;//JPA//    genmask.sin_addr.s_addr=g_broadcast_ip;    genmask.sin_addr.s_addr = genmask_ip;//JPA    new_rtentry->rt_flags = RTF_UP | RTF_HOST | RTF_GATEWAY;/*    new_rtentry->rt_flags = RTF_UP;//JPA    if (gw_ip != dst_ip)        new_rtentry->rt_flags |= RTF_GATEWAY;*/    new_rtentry->rt_metric = 0;    new_rtentry->rt_dev = interf;    new_rtentry->rt_dst = *(struct sockaddr *) &dst;    new_rtentry->rt_gateway = *(struct sockaddr *) &gw;    new_rtentry->rt_genmask = *(struct sockaddr *) &genmask;    return new_rtentry;}int insert_kernel_route_entry(u_int32_t dst_ip, u_int32_t gw_ip, u_int32_t genmask_ip, char *interf){    struct rtentry *new_krtentry;    mm_segment_t oldfs;    int error;    if ((new_krtentry = create_kernel_route_entry(dst_ip, gw_ip, genmask_ip, interf)) == NULL)    {        return -1;    }        oldfs = get_fs();    set_fs(get_ds());    error = ip_rt_ioctl(SIOCADDRT, (char *) new_krtentry);		    set_fs(oldfs);	/*if (error<0)		printk("error %d trying to insert route\n",error);    */    kfree(new_krtentry);    return 0;}int delete_kernel_route_entry(u_int32_t dst_ip, u_int32_t gw_ip, u_int32_t genmask_ip){    struct rtentry *new_krtentry;    mm_segment_t oldfs;    char dst_str[16];    char gw_str[16];        int error;      if ((new_krtentry = create_kernel_route_entry(dst_ip, 0, genmask_ip, NULL)) == NULL)    {   		strcpy(dst_str, inet_ntoa(dst_ip));			strcpy(gw_str, inet_ntoa(gw_ip));			printk("error 47000 trying to delete route %s through %s\n",dst_str, gw_str);        return 1;     }    oldfs = get_fs();    set_fs(KERNEL_DS);    while (ip_rt_ioctl(SIOCDELRT, (char *) new_krtentry) > 0);        set_fs(oldfs);    kfree(new_krtentry);    return 0;}