From 7d412d0b46533c915d94278a8273c757d4c2edc9 Mon Sep 17 00:00:00 2001 From: junyulai Date: Fri, 19 Oct 2018 21:14:30 +0800 Subject: [PATCH] Fix negative uid stats caused by 464xlat adjust when eBPF is on. When using xt_qtaguid to count per uid stats, NetworkStatsService needs to adjust the 464xlat traffic since iptables module would double count for ipv4 and ipv6 packet. But for eBPF, the per uid stats is collected in a different hook, so the adjustment on root uid would only be needed in tx direction. Bug: 112226716 Test: 1. Make ipv4 traffic in ipv6-only network and check data usage. 2. Make ipv4 traffic in a client which connect to ipv6-only hotspot. 3. runtest frameworks-net 4. cts-tradefed run cts -m CtsNetTestCases -t \ android.net.cts.TrafficStatsTest 5. cts-tradefed run cts -m CtsUsageStatsTestCases Change-Id: Ic9a84f5446eddc943c255d5f3b89dad171f53cac --- core/java/android/net/NetworkStats.java | 24 +++++++++++++------ .../internal/net/NetworkStatsFactory.java | 9 +++---- .../server/net/NetworkStatsService.java | 6 +++-- 3 files changed, 26 insertions(+), 13 deletions(-) diff --git a/core/java/android/net/NetworkStats.java b/core/java/android/net/NetworkStats.java index e270fc2e39..5447f595ca 100644 --- a/core/java/android/net/NetworkStats.java +++ b/core/java/android/net/NetworkStats.java @@ -811,14 +811,19 @@ public class NetworkStats implements Parcelable { * packet needs to be subtracted from the root UID on the base interface both for tx * and rx traffic (http://b/12249687, http:/b/33681750). * + * As for eBPF, the per uid stats is collected by different hook, the rx packets on base + * interface will not be counted. Thus, the adjustment on root uid is only needed in tx + * direction. + * *

This method will behave fine if {@code stackedIfaces} is an non-synchronized but add-only * {@code ConcurrentHashMap} * @param baseTraffic Traffic on the base interfaces. Will be mutated. * @param stackedTraffic Stats with traffic stacked on top of our ifaces. Will also be mutated. * @param stackedIfaces Mapping ipv6if -> ipv4if interface where traffic is counted on both. + * @param useBpfStats True if eBPF is in use. */ public static void apply464xlatAdjustments(NetworkStats baseTraffic, - NetworkStats stackedTraffic, Map stackedIfaces) { + NetworkStats stackedTraffic, Map stackedIfaces, boolean useBpfStats) { // Total 464xlat traffic to subtract from uid 0 on all base interfaces. // stackedIfaces may grow afterwards, but NetworkStats will just be resized automatically. final NetworkStats adjustments = new NetworkStats(0, stackedIfaces.size()); @@ -837,15 +842,20 @@ public class NetworkStats implements Parcelable { continue; } // Subtract any 464lat traffic seen for the root UID on the current base interface. + // However, for eBPF, the per uid stats is collected by different hook, the rx packets + // on base interface will not be counted. Thus, the adjustment on root uid is only + // needed in tx direction. adjust.iface = baseIface; - adjust.rxBytes = -(entry.rxBytes + entry.rxPackets * IPV4V6_HEADER_DELTA); + if (!useBpfStats) { + adjust.rxBytes = -(entry.rxBytes + entry.rxPackets * IPV4V6_HEADER_DELTA); + adjust.rxPackets = -entry.rxPackets; + } adjust.txBytes = -(entry.txBytes + entry.txPackets * IPV4V6_HEADER_DELTA); - adjust.rxPackets = -entry.rxPackets; adjust.txPackets = -entry.txPackets; adjustments.combineValues(adjust); - // For 464xlat traffic, xt_qtaguid only counts the bytes of the native IPv4 packet sent - // on the stacked interface with prefix "v4-" and drops the IPv6 header size after + // For 464xlat traffic, per uid stats only counts the bytes of the native IPv4 packet + // sent on the stacked interface with prefix "v4-" and drops the IPv6 header size after // unwrapping. To account correctly for on-the-wire traffic, add the 20 additional bytes // difference for all packets (http://b/12249687, http:/b/33681750). entry.rxBytes += entry.rxPackets * IPV4V6_HEADER_DELTA; @@ -864,8 +874,8 @@ public class NetworkStats implements Parcelable { * base and stacked traffic. * @param stackedIfaces Mapping ipv6if -> ipv4if interface where traffic is counted on both. */ - public void apply464xlatAdjustments(Map stackedIfaces) { - apply464xlatAdjustments(this, this, stackedIfaces); + public void apply464xlatAdjustments(Map stackedIfaces, boolean useBpfStats) { + apply464xlatAdjustments(this, this, stackedIfaces, useBpfStats); } /** diff --git a/core/java/com/android/internal/net/NetworkStatsFactory.java b/core/java/com/android/internal/net/NetworkStatsFactory.java index d1c279918b..0a7cff6856 100644 --- a/core/java/com/android/internal/net/NetworkStatsFactory.java +++ b/core/java/com/android/internal/net/NetworkStatsFactory.java @@ -113,11 +113,12 @@ public class NetworkStatsFactory { /** * Applies 464xlat adjustments with ifaces noted with {@link #noteStackedIface(String, String)}. - * @see NetworkStats#apply464xlatAdjustments(NetworkStats, NetworkStats, Map) + * @see NetworkStats#apply464xlatAdjustments(NetworkStats, NetworkStats, Map, boolean) */ public static void apply464xlatAdjustments(NetworkStats baseTraffic, - NetworkStats stackedTraffic) { - NetworkStats.apply464xlatAdjustments(baseTraffic, stackedTraffic, sStackedIfaces); + NetworkStats stackedTraffic, boolean useBpfStats) { + NetworkStats.apply464xlatAdjustments(baseTraffic, stackedTraffic, sStackedIfaces, + useBpfStats); } @VisibleForTesting @@ -263,7 +264,7 @@ public class NetworkStatsFactory { // No locking here: apply464xlatAdjustments behaves fine with an add-only ConcurrentHashMap. // TODO: remove this and only apply adjustments in NetworkStatsService. - stats.apply464xlatAdjustments(sStackedIfaces); + stats.apply464xlatAdjustments(sStackedIfaces, mUseBpfStats); return stats; } diff --git a/services/core/java/com/android/server/net/NetworkStatsService.java b/services/core/java/com/android/server/net/NetworkStatsService.java index 3f031699bd..383e1e0288 100644 --- a/services/core/java/com/android/server/net/NetworkStatsService.java +++ b/services/core/java/com/android/server/net/NetworkStatsService.java @@ -1620,7 +1620,8 @@ public class NetworkStatsService extends INetworkStatsService.Stub { // fold tethering stats and operations into uid snapshot final NetworkStats tetherSnapshot = getNetworkStatsTethering(STATS_PER_UID); tetherSnapshot.filter(UID_ALL, ifaces, TAG_ALL); - NetworkStatsFactory.apply464xlatAdjustments(uidSnapshot, tetherSnapshot); + NetworkStatsFactory.apply464xlatAdjustments(uidSnapshot, tetherSnapshot, + mUseBpfTrafficStats); uidSnapshot.combineAllValues(tetherSnapshot); final TelephonyManager telephonyManager = (TelephonyManager) mContext.getSystemService( @@ -1630,7 +1631,8 @@ public class NetworkStatsService extends INetworkStatsService.Stub { final NetworkStats vtStats = telephonyManager.getVtDataUsage(STATS_PER_UID); if (vtStats != null) { vtStats.filter(UID_ALL, ifaces, TAG_ALL); - NetworkStatsFactory.apply464xlatAdjustments(uidSnapshot, vtStats); + NetworkStatsFactory.apply464xlatAdjustments(uidSnapshot, vtStats, + mUseBpfTrafficStats); uidSnapshot.combineAllValues(vtStats); }