/*
* $Id$
*
* Copyright (C) 2003-2015 JNode.org
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library 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 Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; If not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
package org.jnode.net.ethernet;
import org.jnode.driver.net.NetworkException;
/**
* @author epr
*/
public class EthernetUtils implements EthernetConstants {
/**
* Gets the procotol info from the ethernet frame in skbuf
* @param hdr
* @throws NetworkException The protocol cannot be found
*/
public static int getProtocol(EthernetHeader hdr) throws NetworkException {
final int length = hdr.getLengthType();
if (length < ETH_FRAME_LEN) {
// It is a length field
return EthernetConstants.ETH_P_802_2;
} else {
// It is a protocol ID
return length;
}
}
}