/* *  $Id: ether_mod_load.c,v 1.1.1.1 2000/05/25 00:28:49 route Exp $ * *  libnet *  FreeBSD ether_mod_load.c - lkm replacement for ether_output * *  Copyright (c) 1998, 1999, 2000 Mike D. Schiffman <mike@infonexus.com> *  Original code and idea 1997 Thomas Ptacek <tqbf@pobox.com> *  All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright *    notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright *    notice, this list of conditions and the following disclaimer in the *    documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * */#define INET#include <sys/param.h>#include <sys/proc.h>#include <sys/systm.h>#include <sys/sysproto.h>#include <sys/conf.h>#include <sys/mount.h>#include <sys/exec.h>#include <sys/sysent.h>#include <sys/lkm.h>#include <sys/file.h>#include <sys/errno.h>#include <sys/queue.h>#include <sys/mbuf.h>#include <sys/socket.h>#include <sys/socketvar.h>#include <sys/protosw.h>#include <sys/kernel.h>#include <sys/sockio.h>#include <net/if.h>#include <net/if_dl.h>#include <net/if_types.h>#include <net/if_var.h>#include <net/radix.h>                                                                extern int ether_output_spoof __P((struct ifnet *, struct mbuf *, struct sockaddr *, struct rtentry *));int ether_spoof(struct lkm_table *lkp, int cmd, int ver);MOD_MISC(etherspoof);static int etherspoof_load(struct lkm_table *lkp, int cmd){    struct ifnet *ifp;    int err = 0;    switch (cmd)    {        case LKM_E_LOAD:            for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_link.tqe_next)            {                if (ifp->if_output == ether_output)                {                    ifp->if_output = ether_output_spoof;                    printf("Interface %s fixed\n", ifp->if_name);                }            }				            printf("Ethernet MAC Address Fix Loaded\n");            break;        case LKM_E_UNLOAD:            for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_link.tqe_next)            {                if (ifp->if_output == ether_output_spoof)                {                    ifp->if_output = ether_output;                    printf("Interface %s unfixed\n", ifp->if_name);                }            }            printf("Ethernet MAC Address Fix Unloaded\n");            break;        default:            err = EINVAL;            break;    }    return(err);}int ether_spoof(struct lkm_table *lkp, int cmd, int ver){    DISPATCH(etherspoof, lkp, cmd, ver, etherspoof_load, etherspoof_load, lkm_nullcmd);}