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typedef unsigned char uint8_t;
typedef unsigned short uint16_t;
typedef unsigned int uint32_t;
typedef unsigned long long uint64_t;
#define ETHER_ADDR_LEN 6 /**< Length of Ethernet address. */
/**
* Ethernet address:
* A universally administered address is uniquely assigned to a device by its
* manufacturer. The first three octets (in transmission order) contain the
* Organizationally Unique Identifier (OUI). The following three (MAC-48 and
* EUI-48) octets are assigned by that organization with the only constraint
* of uniqueness.
* A locally administered address is assigned to a device by a network
* administrator and does not contain OUIs.
* See http://standards.ieee.org/regauth/groupmac/tutorial.html
*/
struct ether_addr {
uint8_t addr_bytes[ETHER_ADDR_LEN]; /**< Addr bytes in tx order */
} __attribute__((__packed__));
/**
* ARP header IPv4 payload.
*/
struct arp_ipv4 {
struct ether_addr arp_sha; /**< sender hardware address */
uint32_t arp_sip; /**< sender IP address */
struct ether_addr arp_tha; /**< target hardware address */
uint32_t arp_tip; /**< target IP address */
} __attribute__((__packed__));
/**
* ARP header.
*/
struct arp_hdr {
uint16_t arp_hrd; /* format of hardware address */
#define ARP_HRD_ETHER 1 /* ARP Ethernet address format */
uint16_t arp_pro; /* format of protocol address */
uint8_t arp_hln; /* length of hardware address */
uint8_t arp_pln; /* length of protocol address */
uint16_t arp_op; /* ARP opcode (command) */
#define ARP_OP_REQUEST 1 /* request to resolve address */
#define ARP_OP_REPLY 2 /* response to previous request */
#define ARP_OP_REVREQUEST 3 /* request proto addr given hardware */
#define ARP_OP_REVREPLY 4 /* response giving protocol address */
#define ARP_OP_INVREQUEST 8 /* request to identify peer */
#define ARP_OP_INVREPLY 9 /* response identifying peer */
struct arp_ipv4 arp_data;
} __attribute__((__packed__));
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