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pf: Convenience function for optional (numeric) arguments
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Authored by kp on May 27 2021, 2:17 PM.

Details

Summary

Add _opt() variants for the uint* functions. These functions set the
provided default value if the nvlist doesn't contain the relevant value.
This is helpful for optional values (e.g. when the API is extended to
add new fields).

While here simplify the header by also using macros to create the
prototypes for the macro-generated function implementations.

MFC after: 2 weeks
Sponsored by: Rubicon Communications, LLC ("Netgate")

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rG FreeBSD src repository
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