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/*
* Copyright 2013 Google Inc.
*
* 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 (at your option) 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.
*/
/*
* Author: ncardwell@google.com (Neal Cardwell)
*
* Ethernet-related declarations.
*
* We cannot include the kernel's linux/if_ether.h because this tool
* tries to compile and work for basically any Linux/BSD kernel
* version. So we have our version of the Ethernet-related
* declarations we require here.
*/
#ifndef __ETHERNET_H__
#define __ETHERNET_H__
#include "types.h"
/* Bytes in an Ethernet address. */
#define ETH_ALEN 6
/* Ethernet header ether_type values. */
#define ETHERTYPE_IP 0x0800 /* IP protocol version 4 */
#define ETHERTYPE_IPV6 0x86dd /* IP protocol version 6 */
#define ETHERTYPE_MPLS_UC 0x8847 /* MPLS unicast */
#define ETHERTYPE_MPLS_MC 0x8848 /* MPLS multicast */
/* To tell a packet socket that you want traffic for all protocols. */
#define ETH_P_ALL 0x0003
/* Ethernet address. */
struct ether_addr {
u8 ether_addr_octet[ETH_ALEN];
} __attribute__ ((__packed__));
/* Ethernet header. */
struct ether_header {
u8 ether_dhost[ETH_ALEN]; /* destination Ethernet address */
u8 ether_shost[ETH_ALEN]; /* source Ethernet address */
u16 ether_type; /* packet type ID field */
} __attribute__ ((__packed__));
static inline void ether_copy(void *dst, const void *src)
{
memcpy(dst, src, sizeof(struct ether_addr));
}
/* Return the ether_type field for packets of the given address family. */
static inline u16 ether_type_for_family(int address_family)
{
if (address_family == AF_INET)
return ETHERTYPE_IP;
else if (address_family == AF_INET6)
return ETHERTYPE_IPV6;
else
assert(!"bad address family");
}
#endif /* __ETHERNET_H__ */
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