/*
* Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
*
* This program 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 2 of the
* License, or any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <byteswap.h>
#include <errno.h>
#include <assert.h>
#include <gpxe/if_arp.h>
#include <gpxe/if_ether.h>
#include <gpxe/netdevice.h>
#include <gpxe/iobuf.h>
#include <gpxe/ethernet.h>
/** @file
*
* Ethernet protocol
*
*/
/** Ethernet broadcast MAC address */
static uint8_t eth_broadcast[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
/**
* Transmit Ethernet packet
*
* @v iobuf I/O buffer
* @v netdev Network device
* @v net_protocol Network-layer protocol
* @v ll_dest Link-layer destination address
*
* Prepends the Ethernet link-layer header and transmits the packet.
*/
static int eth_tx ( struct io_buffer *iobuf, struct net_device *netdev,
struct net_protocol *net_protocol, const void *ll_dest ) {
struct ethhdr *ethhdr = iob_push ( iobuf, sizeof ( *ethhdr ) );
/* Build Ethernet header */
memcpy ( ethhdr->h_dest, ll_dest, ETH_ALEN );
memcpy ( ethhdr->h_source, netdev->ll_addr, ETH_ALEN );
ethhdr->h_protocol = net_protocol->net_proto;
/* Hand off to network device */
return netdev_tx ( netdev, iobuf );
}
/**
* Process received Ethernet packet
*
* @v iobuf I/O buffer
* @v netdev Network device
*
* Strips off the Ethernet link-layer header and passes up to the
* network-layer protocol.
*/
static int eth_rx ( struct io_buffer *iobuf, struct net_device *netdev ) {
struct ethhdr *ethhdr = iobuf->data;
/* Sanity check */
if ( iob_len ( iobuf ) < sizeof ( *ethhdr ) ) {
DBG ( "Ethernet packet too short (%zd bytes)\n",
iob_len ( iobuf ) );
free_iob ( iobuf );
return -EINVAL;
}
/* Strip off Ethernet header */
iob_pull ( iobuf, sizeof ( *ethhdr ) );
/* Hand off to network-layer protocol */
return net_rx ( iobuf, netdev, ethhdr->h_protocol, ethhdr->h_source );
}
/**
* Transcribe Ethernet address
*
* @v ll_addr Link-layer address
* @ret string Link-layer address in human-readable format
*/
const char * eth_ntoa ( const void *ll_addr ) {
static char buf[18]; /* "00:00:00:00:00:00" */
const uint8_t *eth_addr = ll_addr;
sprintf ( buf, "%02x:%02x:%02x:%02x:%02x:%02x",
eth_addr[0], eth_addr[1], eth_addr[2],
eth_addr[3], eth_addr[4], eth_addr[5] );
return buf;
}
/** Ethernet protocol */
struct ll_protocol ethernet_protocol __ll_protocol = {
.name = "Ethernet",
.ll_proto = htons ( ARPHRD_ETHER ),
.ll_addr_len = ETH_ALEN,
.ll_header_len = ETH_HLEN,
.ll_broadcast = eth_broadcast,
.tx = eth_tx,
.rx = eth_rx,
.ntoa = eth_ntoa,
};
