ethernet.h

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#ifndef KERNEL_NET_ETHERNET_H
#define KERNEL_NET_ETHERNET_H
 
#include <kernel/error.h>
#include <kernel/types.h>
 
#include <utils/compiler.h>
 
#define ETHERNET_ADDR_SIZE 6
#define ETHERNET_HEADER_SIZE 14
 
typedef uint8_t mac_address_t[ETHERNET_ADDR_SIZE];
 
struct packet;
 
struct PACKED ethernet_header {
    mac_address_t dst;      
    mac_address_t src;      
    __be uint16_t protocol; 
};
 
static_assert(sizeof(struct ethernet_header) == ETHERNET_HEADER_SIZE);
 
enum ethernet_type {
    ETH_PROTO_IP = 0x0800,  
    ETH_PROTO_ARP = 0x0806, 
};
 
void ethernet_fill_packet(struct packet *, enum ethernet_type,
                          const mac_address_t dst);
 
error_t ethernet_receive_packet(struct packet *);
 
static inline void ethernet_fill_mac(mac_address_t mac, uint64_t mac_raw)
{
    mac[5] = mac_raw;
    mac[4] = mac_raw >> 8;
    mac[3] = mac_raw >> 16;
    mac[2] = mac_raw >> 24;
    mac[1] = mac_raw >> 32;
    mac[0] = mac_raw >> 40;
}
 
#define LOG_MAC_ARG(_mac) mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]
#define FMT_MAC "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx"
 
#endif /* KERNEL_NET_ETHERNET_H */