LineageOS/android_packages_modules_Connectivity
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Reference DataSaver setting from BPF map on V+ only

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Only reference DataSaverEnabled map on V+ platform because the
information in map before platform V is not time-precise. See comment in
this commit for detail.

Bug: 288340533
Test: presubmit
Change-Id: I0795e88e6006e6d24d27b63c31d0e3ed81d0262c
This commit is contained in:
Ken Chen
2023-12-06 17:30:07 +08:00
parent 6f95ab2558
commit 9e1865e48e
1 changed files with 16 additions and 8 deletions
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24
DnsResolver/DnsBpfHelper.cpp
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@@ -62,16 +62,24 @@ base::Result<bool> DnsBpfHelper::isUidNetworkingBlocked(uid_t uid, bool metered)
if (isBlockedByUidRules(enabledRules.value(), uidRules)) return true;
// For data saver.
if (!metered) return false;
// DataSaverEnabled map on V+ platforms is the only reliable source of information about the
// current data saver status. While ConnectivityService offers two ways to update this map for U
// and V+, the U- platform implementation can have delays, potentially leading to inaccurate
// results. Conversely, the V+ platform implementation is synchronized with the actual data saver
// state, making it a trustworthy source. Since this library primarily serves DNS resolvers,
// relying solely on V+ data prevents erroneous blocking of DNS queries.
if (android::modules::sdklevel::IsAtLeastV() && metered) {
// The background data setting (PENALTY_BOX_MATCH) and unrestricted data usage setting
// (HAPPY_BOX_MATCH) for individual apps override the system wide Data Saver setting.
if (uidRules & PENALTY_BOX_MATCH) return true;
if (uidRules & HAPPY_BOX_MATCH) return false;
// The background data setting (PENALTY_BOX_MATCH) and unrestricted data usage setting
// (HAPPY_BOX_MATCH) for individual apps override the system wide Data Saver setting.
if (uidRules & PENALTY_BOX_MATCH) return true;
if (uidRules & HAPPY_BOX_MATCH) return false;
auto dataSaverSetting = mDataSaverEnabledMap.readValue(DATA_SAVER_ENABLED_KEY);
RETURN_IF_RESULT_NOT_OK(dataSaverSetting);
return dataSaverSetting.value();
}
auto dataSaverSetting = mDataSaverEnabledMap.readValue(DATA_SAVER_ENABLED_KEY);
RETURN_IF_RESULT_NOT_OK(dataSaverSetting);
return dataSaverSetting.value();
return false;
}
} // namespace net