For 464xlat scenarios on IPv6 networks, the clatd interface setup
introduces double counting of apps ipv4 traffic. NetworkStatsFactory was
accounting for this on the tx path, but not on the rx path. Also it did
not accounted for the 20 bytes added by the IPv6 header.
This patch subtract correctly the rx and tx traffic from the root uid on
the underlying interface, and also adds correctly the 20 bytes cost per
packet on the stacked interface for 464xlat traffic.
Test: added several new unit tests, based on synthetic data and real
data also.
Bug: 33681750
Change-Id: I4867fe181938d94b5594b3d88896a3c4e01d895c
Merged-In: I2675643b220acbc6110179fa937d4c313b6f5e32
(cherry picked from commit e1bb3a14d1ee1aba2f92e5bccf659774699eaffe)
This groups them together with the rest of the networking unit
tests. It also speeds up compile/test cycles ("runtest -x" of one
file goes from 1m15s to 30s).
Bug: 33681750
Test: runtest frameworks-net passes on internal tree
Merged-In: I53cb0c51355fe4b4b30e451fa09fbbf58da39efd
Change-Id: I5ae5dbf74c94feb0fe3759681e5e6d6fba62fa32
(cherry picked from commit c86013be936f36c61fa0cdfad95141f6de3c6ef7)
