ti-mo / conntrack / 18525639338

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filter: support filtering dump/flush by conntrack zone

Support for the CTA_ZONE attribute for dump and flush requests was added
to the kernel in 6.8: eff3c558bb7e ("netfilter: ctnetlink: support filtering
by zone"). This commit adds a Zone() method to allow filtering by zone ID.

On older kernels, the attribute will be ignored and flows from all zones will
be returned.

Fixes: #23

Signed-off-by: Timo Beckers <timo@incline.eu>
Co-authored-by: Antonin Bas <antonin.bas@broadcom.com>

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