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Differential D53540

tcp: drop SYN ACK segment for listening sockets
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Authored by tuexen on Nov 2 2025, 7:48 PM.
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Reviewers
nickbanks_netflix.com
rrs
rscheff
peter.lei_ieee.org
Group Reviewers
transport
Commits
rGbd4cf77ba2bb: tcp: drop SYN ACK segment for listening sockets
rGe082156ae14b: tcp: drop SYN ACK segment for listening sockets
rGb1ed408e0346: tcp: drop SYN ACK segment for listening sockets
rG239464e99321: tcp: drop SYN ACK segment for listening sockets
Summary

When a SYN ACK is received for a listening socket, just drop it instead of killing the SYN-cache entry and send a RST. This closes the possibility to kill a TCP connection during its handling in the SYN-cache.

Diff Detail

Repository
rG FreeBSD src repository
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Unit
Tests Not Applicable

Revision Contents
Changeset List

PathSize
sys/
netinet/
5 lines
1 line
17 lines

Diff 165728

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sys/netinet/tcp_input.c

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sys/netinet/tcp_syncache.h

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sys/netinet/tcp_syncache.c

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