ae 2cbd12c3b8 Retire IPFIREWALL_NAT64_DIRECT_OUTPUT kernel option. And add ability
to switch the output method in run-time. Also document some sysctl
variables that can by changed for NAT64 module.

NAT64 had compile time option IPFIREWALL_NAT64_DIRECT_OUTPUT to use
if_output directly from nat64 module. By default is used netisr based
output method. Now both methods can be used, but they require different
handling by rules.

Obtained from:	Yandex LLC
MFC after:	3 weeks
Sponsored by:	Yandex LLC
Differential Revision:	https://reviews.freebsd.org/D16647
2018-10-21 16:29:12 +00:00
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