typedef u_int8_t ipv4addr[4] __attribute__ ((packed));

typedef struct {
    u_int8_t opcode;
    u_int8_t hw;
    u_int8_t hwlength;
    u_int8_t hopcount;
    u_int32_t xid;
    u_int16_t secs;
    u_int16_t flags;
    ipv4addr ciaddr, yiaddr, server_ip, bootp_gw_ip;
    u_int8_t hwaddr[16];
    u_int8_t servername[64];
    u_int8_t bootfile[128];
    u_int8_t vendor[DHCP_VENDOR_LENGTH];
} __attribute__ ((packed)) bootp_packet;

typedef u_int8_t hwaddr_t[6];