TCP bug?

[Garrett Wollman]

In article <4A3BF2DF.6080603 at freebsd.org>, Andre writes:

>2) in old T/TCP (RFC1644) which we supported in our TCP code the SYN/FIN
>    combination was a valid one, though not directly intended for SYN/ACK/FIN.

It still is valid, and should be possible to generate using sendmsg()
and MSG_EOF.  Nothing about this depends on T/TCP, which is solely
about reducing the three-way handshake to a two-way handshake.

-GAWollman