PF_AT_TYPE
snl_add_msg_attr_u8(nw, PF_AT_TYPE, addr->type);
{ .type = PF_AT_TYPE, .off = _OUT(type), .cb = snl_attr_get_uint8 },
{ .type = PF_AT_TYPE, .off = _OUT(type), .cb = nlattr_get_uint8 },
nlattr_add_u8(nw, PF_AT_TYPE, a->type);