+#define setbit(field, flag) field |= (1 << (flag))
+#define delbit(field, flag) field &= ~(1 << (flag))
+#define hasbit(field, flag) (field & (1 << (flag)))
+
+#define set(field, family, flag) setbit(field[family == FW3_FAMILY_V6], flag)
+#define del(field, family, flag) delbit(field[family == FW3_FAMILY_V6], flag)
+#define has(field, family, flag) hasbit(field[family == FW3_FAMILY_V6], flag)
+