/*
 * Copyright (c) 1998 The University of Utah and the Flux Group.
 * All rights reserved.
 * 
 * This file is part of the Flux OSKit.  The OSKit is free software, also known
 * as "open source;" you can redistribute it and/or modify it under the terms
 * of the GNU General Public License (GPL), version 2, as published by the Free
 * Software Foundation (FSF).  To explore alternate licensing terms, contact
 * the University of Utah at csl-dist@cs.utah.edu or +1-801-585-3271.
 * 
 * The OSKit 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 GPL for more details.  You should have
 * received a copy of the GPL along with the OSKit; see the file COPYING.  If
 * not, write to the FSF, 59 Temple Place #330, Boston, MA 02111-1307, USA.
 */
/*
 * The Ethernet layer.
 */
#include <oskit/io/bufio.h>
#include <oskit/io/netio.h>
#include <oskit/net/ether.h>
#include <oskit/c/string.h>
#include <oskit/c/arpa/inet.h>

#include <oskit/fudp.h>
#include "fudp.h"

/*
 * Send an Ethernet frame.
 */
oskit_error_t
eth_transmit(oskit_netio_t *netio,
	     unsigned char src[],
	     unsigned char dst[],
	     unsigned short type,
	     oskit_bufio_t *b,
	     oskit_size_t blen)
{
	oskit_error_t err;
	struct ether_header *eth;

	if (blen > ETH_MAX_PACKET)
		return OSKIT_E_INVALIDARG;

	/*
	 * Map in the bufio so `eth' points to the Ethernet header part.
	 */
	err = oskit_bufio_map(b, (void **)&eth, 0, blen);
	if (err)
		return err;

	/*
	 * Fill in the Ethernet header.
	 */
	memcpy(eth->ether_shost, src, ETHER_ADDR_SIZE);
	memcpy(eth->ether_dhost, dst, ETHER_ADDR_SIZE);
	eth->ether_type = htons(type);

	oskit_bufio_unmap(b, eth, 0, blen);

	return oskit_netio_push(netio, b, blen);
}