tree c12686f3571402ec1507c7f306a78c884263446a
parent d28766c74d3e5b7a272e3ad40660c46828d0cdf9
author Jeremy Joslin <jjoslin@google.com> 1470697657 -0700
committer Lorenzo Colitti <lorenzo@google.com> 1485424313 +0900

VPN network stat accounting changes.

Properly account for VPN apps that make heavy use of the tun
interface. Prior to this change a VPN app could be incorrectly charged
for more data than it actually used if it sent more traffic through
the tun interface than the underlying interface.

This change excludes VPN app traffic on the tun interface from the
adjustment pool and doesn't redistribute traffic to the VPN app.
Instead all of the redistributed traffic is deducted from the VPN app
which effectively represents any overhead incurred by the VPN app.

BUG: 30557871

(cherry picked from commit 8b436d865c9f287e9ae491e5278cd8874f4a865b)

Change-Id: I06f01aa8fe5fdc06b2d36cfb9c68feb244c2e5de