src/tcpedit/plugins/ethernet.c
/* $Id$ */
/*
* Copyright (c) 2001-2010 Aaron Turner <aturner at synfin dot net>
* Copyright (c) 2013-2022 Fred Klassen <tcpreplay at appneta dot com> - AppNeta
*
* The Tcpreplay Suite of tools 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 3 of the
* License, or with the authors permission any later version.
*
* The Tcpreplay Suite is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with the Tcpreplay Suite. If not, see <http://www.gnu.org/licenses/>.
*/
#include "ethernet.h"
#include <assert.h>
#include <string.h>
/*
* Takes a ptr to an ethernet address and returns
* 1 if it is unicast or 0 if it is multicast or
* broadcast. As per RFC7042.
*/
int
is_unicast_ethernet(tcpeditdlt_t *ctx, const u_char *ether)
{
assert(ctx);
assert(ether);
/* ff:ff:ff:ff:ff:ff - broadcast */
if (memcmp(ether, BROADCAST_MAC, ETHER_ADDR_LEN) == 0)
return 0;
/* 01:00:5e:(00:00:00-7f:ff:ff) - IPv4 Multicast and MLPS Multicast */
if (memcmp(ðer[0], IPV4_MULTICAST_MAC, 3) == 0)
return 0;
/* 33:33 - IPv6 Multicast */
if (memcmp(ðer[0], IPV6_MULTICAST_MAC, 2) == 0)
return 0;
/*
* 00:00:5e:(00:01:00 – 00:01:ff) - IPv4 Virtual Router Redundancy Protocol
* 00:00:5e:(00:02:00 – 00:02:ff) - IPv6 Virtual Router Redundancy Protocol
*/
if (memcmp(ðer[0], IPV4_VRRP, 5) == 0 || memcmp(ðer[0], IPV6_VRRP, 5) == 0)
return 0;
/* everything else is unicast */
return 1;
}