PF_RT_DIRECTION
snl_add_msg_attr_u8(nw, PF_RT_DIRECTION, r->direction);
{ .type = PF_RT_DIRECTION, .off = _OUT(r.direction), .cb = snl_attr_get_uint8 },
{ .type = PF_RT_DIRECTION, .off = _OUT(direction), .cb = nlattr_get_uint8 },
nlattr_add_u8(nw, PF_RT_DIRECTION, rule->direction);