struct sda6 {
	union {
		struct in6_addr addr;
		u_int8_t        addr8[16]; // To be removed (I hope)
		u_int32_t       addr32[4];
	} _sda6;
#define addr8  _sda6.addr8
#define addr32 _sda6.addr32
};

struct cidr {
	sa_family_t ai_family;
	union {
		u_int32_t   addr4;
		struct sda6 addr6;
	} _addr;
	u_int8_t bits;
};

struct bl {
	sa_family_t ai_family;
	union {
		u_int32_t   addr4;
		struct sda6 addr6;
	} _addr;
	int8_t b;
	int8_t w;
};

#define addr4 _addr.addr4
#define addr6 _addr.addr6