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Fix epoch-related panic in ipdivert & refactor div_output.
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Authored by melifaro on Jan 22 2020, 2:44 PM.
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Details

Summary

Fix epoch-related panic in ipdivert, ensuring in_broadcast() is called within epoch. This got broken in r353292 back in October 2019.
As recent change requires calling in[6]_output() within epoch, it is easier to widen epoch coverage within div_output() instead of cherry-picking individual functions.

Simplify gigantic div_output() by splitting it into 3 functions, handling preliminary setup, remote "ip[6]_output" case and local "netisr" case. Leave original indenting in most parts to ease diff comparison.
Indentation will be fixed by a followup commit.

Test Plan

Tests are added separately in https://reviews.freebsd.org/D23316.

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rS FreeBSD src repository - subversion
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