--- /dev/null
+/*
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <byteswap.h>
+#include <errno.h>
+#include <assert.h>
+#include <ipxe/if_arp.h>
+#include <ipxe/if_ether.h>
+#include <ipxe/in.h>
+#include <ipxe/netdevice.h>
+#include <ipxe/iobuf.h>
+#include <ipxe/ethernet.h>
+
+/** @file
+ *
+ * Ethernet protocol
+ *
+ */
+
+/** Ethernet broadcast MAC address */
+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
+ */
+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 flags Packet flags
+ * @ret rc Return status code
+ */
+int eth_pull ( struct net_device *netdev __unused, struct io_buffer *iobuf,
+ const void **ll_dest, const void **ll_source,
+ uint16_t *net_proto, unsigned int *flags ) {
+ 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;
+ *flags = ( ( is_multicast_ether_addr ( ethhdr->h_dest ) ?
+ LL_MULTICAST : 0 ) |
+ ( is_broadcast_ether_addr ( ethhdr->h_dest ) ?
+ LL_BROADCAST : 0 ) );
+
+ 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 );
+}
+
+/**
+ * Generate random Ethernet address
+ *
+ * @v hw_addr Generated hardware address
+ */
+void eth_random_addr ( void *hw_addr ) {
+ uint8_t *addr = hw_addr;
+ unsigned int i;
+
+ for ( i = 0 ; i < ETH_ALEN ; i++ )
+ addr[i] = random();
+ addr[0] &= ~0x01; /* Clear multicast bit */
+ addr[0] |= 0x02; /* Set locally-assigned bit */
+}
+
+/**
+ * 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;
+}
+
+/**
+ * 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;
+ case AF_INET6:
+ ll_addr_bytes[0] = 0x33;
+ ll_addr_bytes[1] = 0x33;
+ memcpy ( &ll_addr_bytes[2], &net_addr_bytes[12], 4 );
+ return 0;
+ default:
+ return -ENOTSUP;
+ }
+}
+
+/**
+ * Generate Ethernet-compatible compressed link-layer address
+ *
+ * @v ll_addr Link-layer address
+ * @v eth_addr Ethernet-compatible address to fill in
+ */
+int eth_eth_addr ( const void *ll_addr, void *eth_addr ) {
+ memcpy ( eth_addr, ll_addr, ETH_ALEN );
+ return 0;
+}
+
+/**
+ * Generate EUI-64 address
+ *
+ * @v ll_addr Link-layer address
+ * @v eui64 EUI-64 address to fill in
+ * @ret rc Return status code
+ */
+int eth_eui64 ( const void *ll_addr, void *eui64 ) {
+
+ memcpy ( ( eui64 + 0 ), ( ll_addr + 0 ), 3 );
+ memcpy ( ( eui64 + 5 ), ( ll_addr + 3 ), 3 );
+ *( ( uint16_t * ) ( eui64 + 3 ) ) = htons ( 0xfffe );
+ return 0;
+}
+
+/** 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,
+ .eth_addr = eth_eth_addr,
+ .eui64 = eth_eui64,
+};
+
+/**
+ * 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;
+}
+
+/* Drag in Ethernet slow protocols */
+REQUIRE_OBJECT ( eth_slow );
Code Review / kvmfornfv.git / blobdiff