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Subject: Re: [PATCH net-next] fib_rules: rename FRA_PROTOCOL to
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From: David Ahern <dsahern@gmail.com>
Date: Wed, 21 Mar 2018 09:00:09 -0600

> The rule->proto value is not used as a selector. It is passed in, stored
> on a rule and returned to userspace. It is book keeping only so an admin
> has some idea of which program installed the rule.

This is how I understand this value to work as well.