2 * Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License as
6 * published by the Free Software Foundation; either version 2 of the
7 * License, or any later version.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 FILE_LICENCE ( GPL2_OR_LATER );
27 #include <gpxe/if_arp.h>
28 #include <gpxe/if_ether.h>
30 #include <gpxe/netdevice.h>
31 #include <gpxe/iobuf.h>
32 #include <gpxe/ethernet.h>
40 /** Ethernet broadcast MAC address */
41 static uint8_t eth_broadcast[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
44 * Add Ethernet link-layer header
46 * @v netdev Network device
48 * @v ll_dest Link-layer destination address
49 * @v ll_source Source link-layer address
50 * @v net_proto Network-layer protocol, in network-byte order
51 * @ret rc Return status code
53 static int eth_push ( struct net_device *netdev __unused,
54 struct io_buffer *iobuf, const void *ll_dest,
55 const void *ll_source, uint16_t net_proto ) {
56 struct ethhdr *ethhdr = iob_push ( iobuf, sizeof ( *ethhdr ) );
58 /* Build Ethernet header */
59 memcpy ( ethhdr->h_dest, ll_dest, ETH_ALEN );
60 memcpy ( ethhdr->h_source, ll_source, ETH_ALEN );
61 ethhdr->h_protocol = net_proto;
67 * Remove Ethernet link-layer header
69 * @v netdev Network device
71 * @ret ll_dest Link-layer destination address
72 * @ret ll_source Source link-layer address
73 * @ret net_proto Network-layer protocol, in network-byte order
74 * @ret rc Return status code
76 static int eth_pull ( struct net_device *netdev __unused,
77 struct io_buffer *iobuf, const void **ll_dest,
78 const void **ll_source, uint16_t *net_proto ) {
79 struct ethhdr *ethhdr = iobuf->data;
82 if ( iob_len ( iobuf ) < sizeof ( *ethhdr ) ) {
83 DBG ( "Ethernet packet too short (%zd bytes)\n",
88 /* Strip off Ethernet header */
89 iob_pull ( iobuf, sizeof ( *ethhdr ) );
91 /* Fill in required fields */
92 *ll_dest = ethhdr->h_dest;
93 *ll_source = ethhdr->h_source;
94 *net_proto = ethhdr->h_protocol;
100 * Initialise Ethernet address
102 * @v hw_addr Hardware address
103 * @v ll_addr Link-layer address
105 void eth_init_addr ( const void *hw_addr, void *ll_addr ) {
106 memcpy ( ll_addr, hw_addr, ETH_ALEN );
110 * Transcribe Ethernet address
112 * @v ll_addr Link-layer address
113 * @ret string Link-layer address in human-readable format
115 const char * eth_ntoa ( const void *ll_addr ) {
116 static char buf[18]; /* "00:00:00:00:00:00" */
117 const uint8_t *eth_addr = ll_addr;
119 sprintf ( buf, "%02x:%02x:%02x:%02x:%02x:%02x",
120 eth_addr[0], eth_addr[1], eth_addr[2],
121 eth_addr[3], eth_addr[4], eth_addr[5] );
126 * Hash multicast address
128 * @v af Address family
129 * @v net_addr Network-layer address
130 * @v ll_addr Link-layer address to fill in
131 * @ret rc Return status code
133 int eth_mc_hash ( unsigned int af, const void *net_addr, void *ll_addr ) {
134 const uint8_t *net_addr_bytes = net_addr;
135 uint8_t *ll_addr_bytes = ll_addr;
139 ll_addr_bytes[0] = 0x01;
140 ll_addr_bytes[1] = 0x00;
141 ll_addr_bytes[2] = 0x5e;
142 ll_addr_bytes[3] = net_addr_bytes[1] & 0x7f;
143 ll_addr_bytes[4] = net_addr_bytes[2];
144 ll_addr_bytes[5] = net_addr_bytes[3];
152 * Generate Ethernet-compatible compressed link-layer address
154 * @v ll_addr Link-layer address
155 * @v eth_addr Ethernet-compatible address to fill in
157 int eth_eth_addr ( const void *ll_addr, void *eth_addr ) {
158 memcpy ( eth_addr, ll_addr, ETH_ALEN );
162 /** Ethernet protocol */
163 struct ll_protocol ethernet_protocol __ll_protocol = {
165 .ll_proto = htons ( ARPHRD_ETHER ),
166 .hw_addr_len = ETH_ALEN,
167 .ll_addr_len = ETH_ALEN,
168 .ll_header_len = ETH_HLEN,
171 .init_addr = eth_init_addr,
173 .mc_hash = eth_mc_hash,
174 .eth_addr = eth_eth_addr,
178 * Allocate Ethernet device
180 * @v priv_size Size of driver private data
181 * @ret netdev Network device, or NULL
183 struct net_device * alloc_etherdev ( size_t priv_size ) {
184 struct net_device *netdev;
186 netdev = alloc_netdev ( priv_size );
188 netdev->ll_protocol = ðernet_protocol;
189 netdev->ll_broadcast = eth_broadcast;
190 netdev->max_pkt_len = ETH_FRAME_LEN;