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pf: Add counters for syncookies

Description

pf: Add counters for syncookies

Count when we send a syncookie, receive a valid syncookie or detect a
synflood.

Reviewed by: kbowling
MFC after: 1 week
Sponsored by: Modirum MDPay
Differential Revision: https://reviews.freebsd.org/D31713

(cherry picked from commit 4cab80a8dfecdf16333a1113513e046b9f4dd7f6)

Details

Provenance
kpAuthored on Aug 29 2021, 1:54 PM
Reviewer
kbowling
Differential Revision
D31713: pf: Add counters for syncookies
Parents
rG139144a7ae7c: wsp(4): Add evdev support.
Branches
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