linux下如何获取kind=28的tcp选项数据

详见上面的图，在linux下获取tcp选项中的数据 1c070167fb8306
我尝试过用

sin_size = sizeof (struct sockaddr_in);
        if ((new_fd = accept(sockfd, (struct sockaddr *) (&client_addr), &sin_size)) == -1) {
            exit(1);
        }
        unsigned int timeout = 10000; 
        int timeout_len = sizeof(timeout);
        int ret = getsockopt(new_fd, IPPROTO_TCP, TCP_USER_TIMEOUT, &timeout, &timeout_len);
        printf("test=%d,len=%d,ret=%d,SOL_TCP=%d,IPPROTO_TCP=%d\n", timeout, timeout_len, ret,SOL_TCP,IPPROTO_TCP);

去取，但得不到数据，求救c/c++高手，有办法能得到这个数据么？

https://zhidao.baidu.com/question/1732164678417686667.html