3a505dfc35
EFI requires us to be able to specify the source address for individual transmitted packets, and to be able to extract the destination address on received packets. Take advantage of this to rationalise the push() and pull() methods so that push() takes a (dest,source,proto) tuple and pull() returns a (dest,source,proto) tuple.
147 lines
3.9 KiB
C
147 lines
3.9 KiB
C
/*
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* Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#include <byteswap.h>
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#include <errno.h>
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#include <assert.h>
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#include <gpxe/if_arp.h>
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#include <gpxe/if_ether.h>
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#include <gpxe/in.h>
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#include <gpxe/netdevice.h>
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#include <gpxe/iobuf.h>
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#include <gpxe/ethernet.h>
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/** @file
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*
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* Ethernet protocol
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*
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*/
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/** Ethernet broadcast MAC address */
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static uint8_t eth_broadcast[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
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/**
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* Add Ethernet link-layer header
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*
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* @v iobuf I/O buffer
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* @v ll_dest Link-layer destination address
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* @v ll_source Source link-layer address
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* @v net_proto Network-layer protocol, in network-byte order
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* @ret rc Return status code
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*/
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static int eth_push ( struct io_buffer *iobuf, const void *ll_dest,
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const void *ll_source, uint16_t net_proto ) {
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struct ethhdr *ethhdr = iob_push ( iobuf, sizeof ( *ethhdr ) );
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/* Build Ethernet header */
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memcpy ( ethhdr->h_dest, ll_dest, ETH_ALEN );
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memcpy ( ethhdr->h_source, ll_source, ETH_ALEN );
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ethhdr->h_protocol = net_proto;
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return 0;
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}
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/**
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* Remove Ethernet link-layer header
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*
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* @v iobuf I/O buffer
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* @ret ll_dest Link-layer destination address
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* @ret ll_source Source link-layer address
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* @ret net_proto Network-layer protocol, in network-byte order
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* @ret rc Return status code
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*/
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static int eth_pull ( struct io_buffer *iobuf, const void **ll_dest,
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const void **ll_source, uint16_t *net_proto ) {
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struct ethhdr *ethhdr = iobuf->data;
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/* Sanity check */
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if ( iob_len ( iobuf ) < sizeof ( *ethhdr ) ) {
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DBG ( "Ethernet packet too short (%zd bytes)\n",
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iob_len ( iobuf ) );
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return -EINVAL;
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}
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/* Strip off Ethernet header */
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iob_pull ( iobuf, sizeof ( *ethhdr ) );
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/* Fill in required fields */
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*ll_dest = ethhdr->h_dest;
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*ll_source = ethhdr->h_source;
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*net_proto = ethhdr->h_protocol;
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return 0;
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}
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/**
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* Transcribe Ethernet address
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*
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* @v ll_addr Link-layer address
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* @ret string Link-layer address in human-readable format
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*/
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const char * eth_ntoa ( const void *ll_addr ) {
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static char buf[18]; /* "00:00:00:00:00:00" */
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const uint8_t *eth_addr = ll_addr;
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sprintf ( buf, "%02x:%02x:%02x:%02x:%02x:%02x",
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eth_addr[0], eth_addr[1], eth_addr[2],
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eth_addr[3], eth_addr[4], eth_addr[5] );
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return buf;
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}
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/**
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* Hash multicast address
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*
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* @v af Address family
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* @v net_addr Network-layer address
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* @v ll_addr Link-layer address to fill in
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* @ret rc Return status code
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*/
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static int eth_mc_hash ( unsigned int af, const void *net_addr,
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void *ll_addr ) {
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const uint8_t *net_addr_bytes = net_addr;
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uint8_t *ll_addr_bytes = ll_addr;
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switch ( af ) {
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case AF_INET:
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ll_addr_bytes[0] = 0x01;
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ll_addr_bytes[1] = 0x00;
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ll_addr_bytes[2] = 0x5e;
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ll_addr_bytes[3] = net_addr_bytes[1] & 0x7f;
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ll_addr_bytes[4] = net_addr_bytes[2];
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ll_addr_bytes[5] = net_addr_bytes[3];
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default:
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return -ENOTSUP;
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}
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}
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/** Ethernet protocol */
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struct ll_protocol ethernet_protocol __ll_protocol = {
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.name = "Ethernet",
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.ll_proto = htons ( ARPHRD_ETHER ),
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.ll_addr_len = ETH_ALEN,
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.ll_header_len = ETH_HLEN,
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.ll_broadcast = eth_broadcast,
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.push = eth_push,
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.pull = eth_pull,
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.ntoa = eth_ntoa,
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.mc_hash = eth_mc_hash,
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};
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