Commits on Dec 3, 2023

1. Added TcpFastOpenConnect sockopt …

   From [tcp](https://man7.org/linux/man-pages/man7/tcp.7.html) man page:
   ```
   TCP_FASTOPEN_CONNECT (since Linux 4.11)
          This option enables an alternative way to perform Fast
          Open on the active side (client).  When this option is
          enabled, connect(2) would behave differently depending on
          if a Fast Open cookie is available for the destination.
   
          If a cookie is not available (i.e. first contact to the
          destination), connect(2) behaves as usual by sending a SYN
          immediately, except the SYN would include an empty Fast
          Open cookie option to solicit a cookie.
   
          If a cookie is available, connect(2) would return 0
          immediately but the SYN transmission is deferred.  A
          subsequent write(2) or sendmsg(2) would trigger a SYN with
          data plus cookie in the Fast Open option.  In other words,
          the actual connect operation is deferred until data is
          supplied.
   
          Note: While this option is designed for convenience,
          enabling it does change the behaviors and certain system
          calls might set different errno values.  With cookie
          present, write(2) or sendmsg(2) must be called right after
          connect(2) in order to send out SYN+data to complete 3WHS
          and establish connection.  Calling read(2) right after
          connect(2) without write(2) will cause the blocking socket
          to be blocked forever.
   
          The application should either set TCP_FASTOPEN_CONNECT
          socket option before write(2) or sendmsg(2), or call
          write(2) or sendmsg(2) with MSG_FASTOPEN flag directly,
          instead of both on the same connection.
   
          Here is the typical call flow with this new option:
   
              s = socket();
              setsockopt(s, IPPROTO_TCP, TCP_FASTOPEN_CONNECT, 1, ...);
              connect(s);
              write(s); /* write() should always follow connect()
                         * in order to trigger SYN to go out. */
              read(s)/write(s);
              /* ... */
              close(s);
   ```

   

   xonatius committed Dec 3, 2023
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