3c8aafa209
Kill off the static single net device and move to proper dynamic registration (which we need with the new device model). Break the (flawed) assumption that all network-layer protocols can use ARP; such network-layer protocols (i.e. IPv4) must now register as an ARP protocol using ARP_NET_PROTOCOL() and provide a single method for checking the existence of a local network-layer address.
116 lines
3.1 KiB
C
116 lines
3.1 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 <string.h>
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#include <byteswap.h>
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#include <assert.h>
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#include <vsprintf.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/netdevice.h>
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#include <gpxe/pkbuff.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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* Transmit Ethernet packet
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*
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* @v pkb Packet buffer
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* @v netdev Network device
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* @v net_protocol Network-layer protocol
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* @v ll_dest Link-layer destination address
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*
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* Prepends the Ethernet link-layer header and transmits the packet.
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*/
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static int eth_tx ( struct pk_buff *pkb, struct net_device *netdev,
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struct net_protocol *net_protocol, const void *ll_dest ) {
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struct ethhdr *ethhdr = pkb_push ( pkb, 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, netdev->ll_addr, ETH_ALEN );
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ethhdr->h_protocol = net_protocol->net_proto;
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/* Hand off to network device */
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return netdev_tx ( netdev, pkb );
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}
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/**
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* Process received Ethernet packet
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*
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* @v pkb Packet buffer
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* @v netdev Network device
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*
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* Strips off the Ethernet link-layer header and passes up to the
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* network-layer protocol.
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*/
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static void eth_rx ( struct pk_buff *pkb, struct net_device *netdev ) {
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struct ethhdr *ethhdr = pkb->data;
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/* Sanity check */
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if ( pkb_len ( pkb ) < sizeof ( *ethhdr ) ) {
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DBG ( "Ethernet packet too short (%d bytes)\n",
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pkb_len ( pkb ) );
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return;
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}
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/* Strip off Ethernet header */
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pkb_pull ( pkb, sizeof ( *ethhdr ) );
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/* Hand off to network-layer protocol */
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net_rx ( pkb, netdev, ethhdr->h_protocol, ethhdr->h_source );
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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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static 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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/** Ethernet protocol */
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struct ll_protocol ethernet_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_broadcast = eth_broadcast,
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.tx = eth_tx,
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.rx = eth_rx,
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.ntoa = eth_ntoa,
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};
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LL_PROTOCOL ( ethernet_protocol );
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