1 #ifndef _GPXE_IF_ARP_H 2 #define _GPXE_IF_ARP_H 3 4 /** @file 5 * 6 * Address Resolution Protocol constants and types 7 * 8 */ 9 10 FILE_LICENCE ( GPL2_OR_LATER ); 11 12 #include <stdint.h> 13 14 /* ARP protocol HARDWARE identifiers. */ 15 #define ARPHRD_NETROM 0 /**< from KA9Q: NET/ROM pseudo */ 16 #define ARPHRD_ETHER 1 /**< Ethernet 10Mbps */ 17 #define ARPHRD_EETHER 2 /**< Experimental Ethernet */ 18 #define ARPHRD_AX25 3 /**< AX.25 Level 2 */ 19 #define ARPHRD_PRONET 4 /**< PROnet token ring */ 20 #define ARPHRD_CHAOS 5 /**< Chaosnet */ 21 #define ARPHRD_IEEE802 6 /**< IEEE 802.2 Ethernet/TR/TB */ 22 #define ARPHRD_ARCNET 7 /**< ARCnet */ 23 #define ARPHRD_APPLETLK 8 /**< APPLEtalk */ 24 #define ARPHRD_DLCI 15 /**< Frame Relay DLCI */ 25 #define ARPHRD_ATM 19 /**< ATM */ 26 #define ARPHRD_METRICOM 23 /**< Metricom STRIP (new IANA id) */ 27 #define ARPHRD_IEEE1394 24 /**< IEEE 1394 IPv4 - RFC 2734 */ 28 #define ARPHRD_EUI64 27 /**< EUI-64 */ 29 #define ARPHRD_INFINIBAND 32 /**< InfiniBand */ 30 31 /* ARP protocol opcodes. */ 32 #define ARPOP_REQUEST 1 /**< ARP request */ 33 #define ARPOP_REPLY 2 /**< ARP reply */ 34 #define ARPOP_RREQUEST 3 /**< RARP request */ 35 #define ARPOP_RREPLY 4 /**< RARP reply */ 36 #define ARPOP_InREQUEST 8 /**< InARP request */ 37 #define ARPOP_InREPLY 9 /**< InARP reply */ 38 #define ARPOP_NAK 10 /**< (ATM)ARP NAK */ 39 40 /** 41 * An ARP header 42 * 43 * This contains only the fixed-size portions of an ARP header; for 44 * other fields use the arp_{sender,target}_{ha,pa} family of 45 * functions. 46 */ 47 struct arphdr { 48 /** Link-layer protocol 49 * 50 * This is an ARPHRD_XXX constant 51 */ 52 uint16_t ar_hrd; 53 /** Network-layer protocol 54 * 55 * This is, for Ethernet, an ETH_P_XXX constant. 56 */ 57 uint16_t ar_pro; 58 /** Link-layer address length */ 59 uint8_t ar_hln; 60 /** Network-layer address length */ 61 uint8_t ar_pln; 62 /** ARP opcode */ 63 uint16_t ar_op; 64 } __attribute__ (( packed )); 65 66 /** ARP packet sender hardware address 67 * 68 * @v arphdr ARP header 69 * @ret ar_sha Sender hardware address 70 */ arp_sender_ha(struct arphdr * arphdr)71static inline void * arp_sender_ha ( struct arphdr *arphdr ) { 72 return ( ( ( void * ) arphdr ) + sizeof ( *arphdr ) ); 73 } 74 75 /** ARP packet sender protocol address 76 * 77 * @v arphdr ARP header 78 * @ret ar_spa Sender protocol address 79 */ arp_sender_pa(struct arphdr * arphdr)80static inline void * arp_sender_pa ( struct arphdr *arphdr ) { 81 return ( arp_sender_ha ( arphdr ) + arphdr->ar_hln ); 82 } 83 84 /** ARP packet target hardware address 85 * 86 * @v arphdr ARP header 87 * @ret ar_tha Target hardware address 88 */ arp_target_ha(struct arphdr * arphdr)89static inline void * arp_target_ha ( struct arphdr *arphdr ) { 90 return ( arp_sender_pa ( arphdr ) + arphdr->ar_pln ); 91 } 92 93 /** ARP packet target protocol address 94 * 95 * @v arphdr ARP header 96 * @ret ar_tpa Target protocol address 97 */ arp_target_pa(struct arphdr * arphdr)98static inline void * arp_target_pa ( struct arphdr *arphdr ) { 99 return ( arp_target_ha ( arphdr ) + arphdr->ar_hln ); 100 } 101 102 #endif /* _GPXE_IF_ARP_H */ 103