netdev - [RFC PATCH net-next 0/2] TCP: Fast-Open observability

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Message-ID: <cover.1741877016.git.jgh@exim.org>
Date: Thu, 13 Mar 2025 14:45:49 +0000
From: Jeremy Harris <jgh@...m.org>
To: netdev@...r.kernel.org
Cc: Jeremy Harris <jgh@...m.org>
Subject: [RFC PATCH net-next 0/2] TCP: Fast-Open observability

Whether TCP Fast Open was used, or not, for a connection is not reliably
observable by an accepting application.

Fix this by noting during SYN processing that an acceptable Fast Open option
was used, and provide this to userland via getsockopt TCP_INFO.

Jeremy Harris (2):
  TCP: note received valid-cookie Fast Open option
  TCP: pass accepted-TFO indication through getsockopt

 include/linux/tcp.h      | 3 ++-
 include/uapi/linux/tcp.h | 1 +
 net/ipv4/tcp.c           | 2 ++
 net/ipv4/tcp_fastopen.c  | 1 +
 4 files changed, 6 insertions(+), 1 deletion(-)


base-commit: 5a1dddd2944492edb1e61c5db1cc386e5419fcf4
-- 
2.48.1