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pf: implement adaptive mode
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Authored by kp on Sep 25 2021, 1:06 PM.

Details

Summary

Use atomic counters to ensure that we correctly track the number of half
open states and syncookie responses in-flight.
This determines if we activate or deactivate syncookies in adaptive
mode.

MFC after: 1 week
Sponsored by: Modirum MDPay

Diff Detail

Repository
R10 FreeBSD src repository
Lint
Automatic diff as part of commit; lint not applicable.
Unit
Automatic diff as part of commit; unit tests not applicable.