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pf: expose more syncookie state information to userspace

Description

pf: expose more syncookie state information to userspace

Allow userspace to retrieve low and high water marks, as well as the
current number of half open states.

MFC after: 1 week
Sponsored by: Modirum MDPay

(cherry picked from commit a6173e94635b03aa7aab90a67785c8c3e7c6247b)

Details

Provenance
kpAuthored on Nov 6 2023, 9:20 PM
Parents
rG1e147980497b: bpf: Make dead_bpf_if const
Branches
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