Linux 什么'；TCP\u NEW\u SYN\u RECV的含义是什么？

我知道TCP_SYN_RECV，但是TCP_NEW_SYN_RECV的含义是什么？他们之间有什么区别

我还看到了下面的代码“sk->sk_state==TCP_NEW_SYN_RECV”，为什么不改为使用“sk->sk_state==TCP_SYN_RECV”

我发现：

TCP_SYN_RECV state is currently used by fast open sockets.

Initial TCP requests (the pseudo sockets created when a SYN is received)
are not yet associated to a state. They are attached to their parent,
and the parent is in TCP_LISTEN state.

This commit adds TCP_NEW_SYN_RECV state, so that we can convert
TCP stack to a different schem gradually.

---

source，作者提交：

您可以从相应的提交中找到它。在内核源代码目录中使用git log-S'TCP_NEW_SYN_RECV'--path/to/file/of/interest，找出向上述文件添加了

TCP_NEW_SYN_RECV

的提交。阅读发现的提交消息，了解新定义及其用法。另外，我建议您使用mainline repo from（），而不是github。答案很好，我知道了，非常感谢。

if (sk->sk_state == TCP_NEW_SYN_RECV) {
    struct request_sock *req = inet_reqsk(sk);
    struct sock *nsk;

TCP_SYN_RECV state is currently used by fast open sockets.

Initial TCP requests (the pseudo sockets created when a SYN is received)
are not yet associated to a state. They are attached to their parent,
and the parent is in TCP_LISTEN state.

This commit adds TCP_NEW_SYN_RECV state, so that we can convert
TCP stack to a different schem gradually.