David Anderson c8c493f3d9 wgengine/magicsock: make ReceiveIPv4 a little easier to follow.
The previous code used a lot of whole-function variables and shared
behavior that only triggered based on prior action from a single codepath.
Instead of that, move the small amounts of "shared" code into each switch
case.

Signed-off-by: David Anderson <danderson@tailscale.com>
2020-12-18 01:15:53 -08:00
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