arp.h

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#ifndef KERNEL_NET_ARP_H
#define KERNEL_NET_ARP_H
 
#include <kernel/net/ethernet.h>
#include <kernel/net/ipv4.h>
 
#define ARP_PACKET_SIZE \
    (sizeof(struct ethernet_header) + sizeof(struct arp_header))
 
struct PACKED arp_header {
    __be uint16_t hw_type;   
    __be uint16_t prot_type; 
    uint8_t hw_length;       
    uint8_t prot_length;     
    __be uint16_t operation; 
    mac_address_t src_mac;   
    __be ipv4_t src_ip;      
    mac_address_t dst_mac;   
    __be ipv4_t dst_ip;      
};
 
enum arp_hw_type {
    ARP_HW_ETHERNET = 1, 
};
 
enum arp_operation {
    ARP_REQUEST = 1, 
    ARP_REPLY = 2,   
};
 
static inline size_t arp_header_size(struct arp_header *hdr)
{
    return sizeof(*hdr);
}
 
 error_t arp_add(__be ipv4_t, mac_address_t);
 
const mac_address_t *arp_get(__be ipv4_t);
 
error_t arp_receive_packet(struct packet *);
 
error_t arp_send_packet(struct arp_header *);
 
#endif /* KERNEL_NET_ARP_H */