https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=242492
Bug ID: 242492
Summary: TCP fat open observability
Product: Base System
Version: 12.1-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: b...@freebsd.org
Reporter: j2...@wizmail.org
A TCP connection made by sendto() with TCP_FASTOPEN set always sets the
TCP_FASTOPEN readback getsockopt. It would be (possibly more) useful to the
client application to know if a supposedly valid TFO cookie was sent on the SYN
(as opposed to the current possibilty of only having sent a TFO request) and/or
whether the server agreed that the cookie was acceptable.
TCP_INFO TCPOPT_FAST_OPEN appears to match getsockopt/TCP_FASTOPEN, for a
client.
I'm not sure that we really want to go so far as knowing whether client
data-on-SYN was actually accepted with the SYN, but it's another item in the
bucket.
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