arp.h

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#ifndef __ARP_H__
#define __ARP_H__
 
#include <stdint.h>
#include <fs/vfs.h>
 
#define ARP_OPERATION_REQUEST 0x0100
#define ARP_OPERATION_RESPONSE 0x0200
 
#pragma pack(push,1)
typedef struct _arp_ {
    uint16_t hwAddressType;
    uint16_t hwProtocolType;
    uint8_t hwAddressSize;
    uint8_t protocolSize;
    uint16_t operation;
    union {
        struct {
            uint8_t arp_sha[6];
            uint32_t arp_spa;
            uint8_t arp_tha[6];
            uint32_t arp_tpa;
        }arp_eth_ipv4;
    }arp_data;
}NetARP;
#pragma pack(pop)
 
typedef struct _arp_cache_ {
    uint8_t hw_address[6];
    uint16_t flags;
    uint32_t ipAddress;
    AuVFSNode* nic;
}AuARPCache;
 
 
/*
 * ARPProtocolInitialise -- initialise arp protocol
 */
extern void ARPProtocolInitialise();
 
/*
 * ARPProtocolAdd -- add a new information to ARP cache list
 * @param nic -- Pointer to NIC device
 * @param address -- IP Address
 * @param hwaddr -- Hardware address to add
 */
extern void ARPProtocolAdd(AuVFSNode* nic, uint32_t address, uint8_t* hwaddr);
 
/*
 * AuARPGet -- Returns an ARP by its ip address
 * @param address -- IP Address to look
 */
extern AuARPCache* AuARPGet(uint32_t address);
 
/*
 * AuARPRequestMAC -- request a mac address from
 * server
 */
extern void AuARPRequestMAC(AuVFSNode* nic, uint32_t addr);
 
/*
 * ARPHandlePacket -- handle incoming ARP packet
 * @param data -- Pointer to ARP packet
 * @param nic -- Pointer to Network Device file
 */
extern void ARPHandlePacket(void* data, AuVFSNode* nic);
 
#endif