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#ifndef _GPXE_IF_ARP_H
#define _GPXE_IF_ARP_H
/** @file
*
* Address Resolution Protocol constants and types
*
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <stdint.h>
/* ARP protocol HARDWARE identifiers. */
#define ARPHRD_NETROM 0 /**< from KA9Q: NET/ROM pseudo */
#define ARPHRD_ETHER 1 /**< Ethernet 10Mbps */
#define ARPHRD_EETHER 2 /**< Experimental Ethernet */
#define ARPHRD_AX25 3 /**< AX.25 Level 2 */
#define ARPHRD_PRONET 4 /**< PROnet token ring */
#define ARPHRD_CHAOS 5 /**< Chaosnet */
#define ARPHRD_IEEE802 6 /**< IEEE 802.2 Ethernet/TR/TB */
#define ARPHRD_ARCNET 7 /**< ARCnet */
#define ARPHRD_APPLETLK 8 /**< APPLEtalk */
#define ARPHRD_DLCI 15 /**< Frame Relay DLCI */
#define ARPHRD_ATM 19 /**< ATM */
#define ARPHRD_METRICOM 23 /**< Metricom STRIP (new IANA id) */
#define ARPHRD_IEEE1394 24 /**< IEEE 1394 IPv4 - RFC 2734 */
#define ARPHRD_EUI64 27 /**< EUI-64 */
#define ARPHRD_INFINIBAND 32 /**< InfiniBand */
/* ARP protocol opcodes. */
#define ARPOP_REQUEST 1 /**< ARP request */
#define ARPOP_REPLY 2 /**< ARP reply */
#define ARPOP_RREQUEST 3 /**< RARP request */
#define ARPOP_RREPLY 4 /**< RARP reply */
#define ARPOP_InREQUEST 8 /**< InARP request */
#define ARPOP_InREPLY 9 /**< InARP reply */
#define ARPOP_NAK 10 /**< (ATM)ARP NAK */
/**
* An ARP header
*
* This contains only the fixed-size portions of an ARP header; for
* other fields use the arp_{sender,target}_{ha,pa} family of
* functions.
*/
struct arphdr {
/** Link-layer protocol
*
* This is an ARPHRD_XXX constant
*/
uint16_t ar_hrd;
/** Network-layer protocol
*
* This is, for Ethernet, an ETH_P_XXX constant.
*/
uint16_t ar_pro;
/** Link-layer address length */
uint8_t ar_hln;
/** Network-layer address length */
uint8_t ar_pln;
/** ARP opcode */
uint16_t ar_op;
} __attribute__ (( packed ));
/** ARP packet sender hardware address
*
* @v arphdr ARP header
* @ret ar_sha Sender hardware address
*/
static inline void * arp_sender_ha ( struct arphdr *arphdr ) {
return ( ( ( void * ) arphdr ) + sizeof ( *arphdr ) );
}
/** ARP packet sender protocol address
*
* @v arphdr ARP header
* @ret ar_spa Sender protocol address
*/
static inline void * arp_sender_pa ( struct arphdr *arphdr ) {
return ( arp_sender_ha ( arphdr ) + arphdr->ar_hln );
}
/** ARP packet target hardware address
*
* @v arphdr ARP header
* @ret ar_tha Target hardware address
*/
static inline void * arp_target_ha ( struct arphdr *arphdr ) {
return ( arp_sender_pa ( arphdr ) + arphdr->ar_pln );
}
/** ARP packet target protocol address
*
* @v arphdr ARP header
* @ret ar_tpa Target protocol address
*/
static inline void * arp_target_pa ( struct arphdr *arphdr ) {
return ( arp_target_ha ( arphdr ) + arphdr->ar_hln );
}
#endif /* _GPXE_IF_ARP_H */
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