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/*
* 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.
*/
FILE_LICENCE ( GPL2_OR_LATER );
#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/in.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};
/**
* Add Ethernet link-layer header
*
* @v netdev Network device
* @v iobuf I/O buffer
* @v ll_dest Link-layer destination address
* @v ll_source Source link-layer address
* @v net_proto Network-layer protocol, in network-byte order
* @ret rc Return status code
*/
static int eth_push ( struct net_device *netdev __unused,
struct io_buffer *iobuf, const void *ll_dest,
const void *ll_source, uint16_t net_proto ) {
struct ethhdr *ethhdr = iob_push ( iobuf, sizeof ( *ethhdr ) );
/* Build Ethernet header */
memcpy ( ethhdr->h_dest, ll_dest, ETH_ALEN );
memcpy ( ethhdr->h_source, ll_source, ETH_ALEN );
ethhdr->h_protocol = net_proto;
return 0;
}
/**
* Remove Ethernet link-layer header
*
* @v netdev Network device
* @v iobuf I/O buffer
* @ret ll_dest Link-layer destination address
* @ret ll_source Source link-layer address
* @ret net_proto Network-layer protocol, in network-byte order
* @ret rc Return status code
*/
static int eth_pull ( struct net_device *netdev __unused,
struct io_buffer *iobuf, const void **ll_dest,
const void **ll_source, uint16_t *net_proto ) {
struct ethhdr *ethhdr = iobuf->data;
/* Sanity check */
if ( iob_len ( iobuf ) < sizeof ( *ethhdr ) ) {
DBG ( "Ethernet packet too short (%zd bytes)\n",
iob_len ( iobuf ) );
return -EINVAL;
}
/* Strip off Ethernet header */
iob_pull ( iobuf, sizeof ( *ethhdr ) );
/* Fill in required fields */
*ll_dest = ethhdr->h_dest;
*ll_source = ethhdr->h_source;
*net_proto = ethhdr->h_protocol;
return 0;
}
/**
* Initialise Ethernet address
*
* @v hw_addr Hardware address
* @v ll_addr Link-layer address
*/
void eth_init_addr ( const void *hw_addr, void *ll_addr ) {
memcpy ( ll_addr, hw_addr, ETH_ALEN );
}
/**
* 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;
snprintf ( buf, sizeof (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;
}
/**
* Hash multicast address
*
* @v af Address family
* @v net_addr Network-layer address
* @v ll_addr Link-layer address to fill in
* @ret rc Return status code
*/
int eth_mc_hash ( unsigned int af, const void *net_addr, void *ll_addr ) {
const uint8_t *net_addr_bytes = net_addr;
uint8_t *ll_addr_bytes = ll_addr;
switch ( af ) {
case AF_INET:
ll_addr_bytes[0] = 0x01;
ll_addr_bytes[1] = 0x00;
ll_addr_bytes[2] = 0x5e;
ll_addr_bytes[3] = net_addr_bytes[1] & 0x7f;
ll_addr_bytes[4] = net_addr_bytes[2];
ll_addr_bytes[5] = net_addr_bytes[3];
return 0;
default:
return -ENOTSUP;
}
}
/** Ethernet protocol */
struct ll_protocol ethernet_protocol __ll_protocol = {
.name = "Ethernet",
.ll_proto = htons ( ARPHRD_ETHER ),
.hw_addr_len = ETH_ALEN,
.ll_addr_len = ETH_ALEN,
.ll_header_len = ETH_HLEN,
.push = eth_push,
.pull = eth_pull,
.init_addr = eth_init_addr,
.ntoa = eth_ntoa,
.mc_hash = eth_mc_hash,
};
/**
* Allocate Ethernet device
*
* @v priv_size Size of driver private data
* @ret netdev Network device, or NULL
*/
struct net_device * alloc_etherdev ( size_t priv_size ) {
struct net_device *netdev;
netdev = alloc_netdev ( priv_size );
if ( netdev ) {
netdev->ll_protocol = ðernet_protocol;
netdev->ll_broadcast = eth_broadcast;
netdev->max_pkt_len = ETH_FRAME_LEN;
}
return netdev;
}
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