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Remove per-packet ifa refcounting from IPv6 fast path.
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Authored by melifaro on Feb 13 2021, 3:04 PM.
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Details

Summary

Currently ip6_input() calls in6ifa_ifwithaddr() for
every local packet, in order to check if the target ip
belongs to the local ifa in proper state and increase
its counters.

in6ifa_ifwithaddr() references found ifa.
With epoch changes, both ip6_input() and all other current callers
of in6ifa_ifwithaddr() do not need this reference
anymore, as epoch provides stability guarantee.

Given that, update in6ifa_ifwithaddr() to allow
it to return ifa without referencing it, while preserving
option for getting referenced ifa if so desired.

Note: depends on D28647.

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rG FreeBSD src repository
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