Merge changes Ie73ba058,I4393afcb,Ifebd946e,Ib12ee882,Ia171b779 am: e273042404... (44ceb47b) · Commits · e / os / android_frameworks_base

core/java/android/net/NetworkStats.java

+26 −38

Original line number	Diff line number	Diff line
		@@ -1047,22 +1047,22 @@ public final class NetworkStats implements Parcelable {
		}

		/**
		* Calculate and apply adjustments to captured statistics for 464xlat traffic counted twice.
		* Calculate and apply adjustments to captured statistics for 464xlat traffic.
		*
		* <p>This mutates stacked traffic stats, to account for IPv4/IPv6 header size difference.
		*
		* <p>This mutates both base and stacked traffic stats, to account respectively for
		* double-counted traffic and IPv4/IPv6 header size difference.
		* <p>UID stats, which are only accounted on the stacked interface, need to be increased
		* by 20 bytes/packet to account for translation overhead.
		*
		* <p>For 464xlat traffic, xt_qtaguid sees every IPv4 packet twice, once as a native IPv4
		* packet on the stacked interface, and once as translated to an IPv6 packet on the
		* base interface. For correct stats accounting on the base interface, if using xt_qtaguid,
		* every rx 464xlat packet needs to be subtracted from the root UID on the base interface
		* (http://b/12249687, http:/b/33681750), and every tx 464xlat packet which was counted onto
		* clat uid should be ignored.
		* <p>The potential additional overhead of 8 bytes/packet for ip fragments is ignored.
		*
		* 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 not needed. However, the
		* tx traffic counted in the same way xt_qtaguid does, so the traffic on clat uid still
		* needs to be ignored.
		* <p>Interface stats need to sum traffic on both stacked and base interface because:
		* - eBPF offloaded packets appear only on the stacked interface
		* - Non-offloaded ingress packets appear only on the stacked interface
		* (due to iptables raw PREROUTING drop rules)
		* - Non-offloaded egress packets appear only on the stacked interface
		* (due to ignoring traffic from clat daemon by uid match)
		* (and of course the 20 bytes/packet overhead needs to be applied to stacked interface stats)
		*
		* <p>This method will behave fine if {@code stackedIfaces} is an non-synchronized but add-only
		* {@code ConcurrentHashMap}
		@@ -1074,46 +1074,34 @@ public final class NetworkStats implements Parcelable {
		*/
		public static void apply464xlatAdjustments(NetworkStats baseTraffic,
		NetworkStats stackedTraffic, Map<String, String> 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());

		// For recycling
		Entry entry = null;
		Entry adjust = new NetworkStats.Entry(IFACE_ALL, 0, 0, 0, 0, 0, 0, 0L, 0L, 0L, 0L, 0L);

		for (int i = 0; i < stackedTraffic.size; i++) {
		entry = stackedTraffic.getValues(i, entry);
		if (entry.iface == null \|\| !entry.iface.startsWith(CLATD_INTERFACE_PREFIX)) {
		continue;
		}
		final String baseIface = stackedIfaces.get(entry.iface);
		if (baseIface == null) {
		continue;
		}
		// Subtract xt_qtaguid 464lat rx traffic seen for the root UID on the current base
		// interface. As for eBPF, the per uid stats is collected by different hook, the rx
		// packets on base interface will not be counted.
		adjust.iface = baseIface;
		if (!useBpfStats) {
		adjust.rxBytes = -(entry.rxBytes + entry.rxPackets * IPV4V6_HEADER_DELTA);
		adjust.rxPackets = -entry.rxPackets;
		}
		adjustments.combineValues(adjust);
		if (entry == null) continue;
		if (entry.iface == null) continue;
		if (!entry.iface.startsWith(CLATD_INTERFACE_PREFIX)) continue;

		// 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).
		//
		// Note: this doesn't account for LRO/GRO/GSO/TSO (ie. >mtu) traffic correctly, nor
		// does it correctly account for the 8 extra bytes in the IPv6 fragmentation header.
		//
		// While the ebpf code path does try to simulate proper post segmentation packet
		// counts, we have nothing of the sort of xt_qtaguid stats.
		entry.rxBytes += entry.rxPackets * IPV4V6_HEADER_DELTA;
		entry.txBytes += entry.txPackets * IPV4V6_HEADER_DELTA;
		stackedTraffic.setValues(i, entry);
		}

		// Traffic on clat uid is v6 tx traffic that is already counted with app uid on the stacked
		// v4 interface, so it needs to be removed to avoid double-counting.
		// Theoretically there should be no traffic accounted to the clat daemon's uid:
		// see ebpf program 'netd.c's early returns
		// and iptables '-m owner --uid-owner clat -j RETURN' rules prior to accounting
		// TODO: remove this - should definitely be safe once ebpf only.
		baseTraffic.removeUids(new int[] {CLAT_UID});
		baseTraffic.combineAllValues(adjustments);
		}

		/**

tests/net/java/android/net/NetworkStatsTest.java

+4 −15

Original line number	Diff line number	Diff line
		@@ -909,8 +909,8 @@ public class NetworkStatsTest {
		13805 /* txPackets */,
		0 /* operations */);

		// Traffic measured for the root uid on the base interface if eBPF is in use.
		final NetworkStats.Entry ebpfRootUidEntry = new NetworkStats.Entry(
		// Traffic measured for the root uid on the base interface.
		final NetworkStats.Entry rootUidEntry = new NetworkStats.Entry(
		baseIface, rootUid, SET_DEFAULT, TAG_NONE,
		163577 /* rxBytes */,
		187 /* rxPackets */,
		@@ -918,17 +918,6 @@ public class NetworkStatsTest {
		97 /* txPackets */,
		0 /* operations */);

		// Traffic measured for the root uid on the base interface if xt_qtaguid is in use.
		// Incorrectly includes appEntry's bytes and packets, plus IPv4-IPv6 translation
		// overhead (20 bytes per packet), in rx direction.
		final NetworkStats.Entry xtRootUidEntry = new NetworkStats.Entry(
		baseIface, rootUid, SET_DEFAULT, TAG_NONE,
		31113087 /* rxBytes */,
		22588 /* rxPackets */,
		17607 /* txBytes */,
		97 /* txPackets */,
		0 /* operations */);

		final NetworkStats.Entry otherEntry = new NetworkStats.Entry(
		otherIface, appUid, SET_DEFAULT, TAG_NONE,
		2600 /* rxBytes */,
		@@ -939,12 +928,12 @@ public class NetworkStatsTest {

		final NetworkStats statsXt = new NetworkStats(TEST_START, 3)
		.insertEntry(appEntry)
		.insertEntry(xtRootUidEntry)
		.insertEntry(rootUidEntry)
		.insertEntry(otherEntry);

		final NetworkStats statsEbpf = new NetworkStats(TEST_START, 3)
		.insertEntry(appEntry)
		.insertEntry(ebpfRootUidEntry)
		.insertEntry(rootUidEntry)
		.insertEntry(otherEntry);

		statsXt.apply464xlatAdjustments(stackedIface, false);

tests/net/java/com/android/server/net/NetworkStatsFactoryTest.java

+4 −6

Original line number	Diff line number	Diff line
		@@ -446,7 +446,7 @@ public class NetworkStatsFactoryTest extends NetworkStatsBaseTest {
		assertStatsEntry(stats, "v4-wlan0", 1000, SET_DEFAULT, 0x0, 30812L, 2310L);
		assertStatsEntry(stats, "v4-wlan0", 10102, SET_DEFAULT, 0x0, 10022L, 3330L);
		assertStatsEntry(stats, "v4-wlan0", 10060, SET_DEFAULT, 0x0, 9532772L, 254112L);
		assertStatsEntry(stats, "wlan0", 0, SET_DEFAULT, 0x0, 15229L, 0L);
		assertStatsEntry(stats, "wlan0", 0, SET_DEFAULT, 0x0, 0L, 0L);
		assertStatsEntry(stats, "wlan0", 1000, SET_DEFAULT, 0x0, 6126L, 2013L);
		assertStatsEntry(stats, "wlan0", 10013, SET_DEFAULT, 0x0, 0L, 144L);
		assertStatsEntry(stats, "wlan0", 10018, SET_DEFAULT, 0x0, 5980263L, 167667L);
		@@ -468,9 +468,7 @@ public class NetworkStatsFactoryTest extends NetworkStatsBaseTest {
		long appRxBytesAfter = 439237478L;
		assertEquals("App traffic should be ~100MB", 110553449, appRxBytesAfter - appRxBytesBefore);

		long rootRxBytesBefore = 1394011L;
		long rootRxBytesAfter = 1398634L;
		assertEquals("UID 0 traffic should be ~0", 4623, rootRxBytesAfter - rootRxBytesBefore);
		long rootRxBytes = 330187296L;

		mFactory.noteStackedIface("v4-wlan0", "wlan0");
		NetworkStats stats;
		@@ -478,12 +476,12 @@ public class NetworkStatsFactoryTest extends NetworkStatsBaseTest {
		// Stats snapshot before the download
		stats = parseDetailedStats(R.raw.xt_qtaguid_with_clat_100mb_download_before);
		assertStatsEntry(stats, "v4-wlan0", 10106, SET_FOREGROUND, 0x0, appRxBytesBefore, 5199872L);
		assertStatsEntry(stats, "wlan0", 0, SET_DEFAULT, 0x0, rootRxBytesBefore, 0L);
		assertStatsEntry(stats, "wlan0", 0, SET_DEFAULT, 0x0, rootRxBytes, 0L);

		// Stats snapshot after the download
		stats = parseDetailedStats(R.raw.xt_qtaguid_with_clat_100mb_download_after);
		assertStatsEntry(stats, "v4-wlan0", 10106, SET_FOREGROUND, 0x0, appRxBytesAfter, 7867488L);
		assertStatsEntry(stats, "wlan0", 0, SET_DEFAULT, 0x0, rootRxBytesAfter, 0L);
		assertStatsEntry(stats, "wlan0", 0, SET_DEFAULT, 0x0, rootRxBytes, 0L);
		}

		/**

tests/net/res/raw/xt_qtaguid_with_clat

+1 −1

Original line number	Diff line number	Diff line
		@@ -7,7 +7,7 @@ idx iface acct_tag_hex uid_tag_int cnt_set rx_bytes rx_packets tx_bytes tx_packe
		7 v4-wlan0 0x0 10060 1 1448660 1041 31192 753 1448660 1041 0 0 0 0 31192 753 0 0 0 0
		8 v4-wlan0 0x0 10102 0 9702 16 2870 23 9702 16 0 0 0 0 2870 23 0 0 0 0
		9 v4-wlan0 0x0 10102 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
		10 wlan0 0x0 0 0 11058671 7892 0 0 11043898 7811 13117 61 1656 20 0 0 0 0 0 0
		10 wlan0 0x0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
		11 wlan0 0x0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
		12 wlan0 0x0 1000 0 6126 13 2013 16 5934 11 192 2 0 0 1821 14 192 2 0 0
		13 wlan0 0x0 1000 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

tests/net/res/raw/xt_qtaguid_with_clat_100mb_download_after

+1 −1

Original line number	Diff line number	Diff line
		@@ -9,7 +9,7 @@ idx iface acct_tag_hex uid_tag_int cnt_set rx_bytes rx_packets tx_bytes tx_packe
		9 v4-wlan0 0x0 10057 1 728 7 392 7 0 0 728 7 0 0 0 0 392 7 0 0
		10 v4-wlan0 0x0 10106 0 2232 18 2232 18 0 0 2232 18 0 0 0 0 2232 18 0 0
		11 v4-wlan0 0x0 10106 1 432952718 314238 5442288 121260 432950238 314218 2480 20 0 0 5433900 121029 8388 231 0 0
		12 wlan0 0x0 0 0 440746376 329772 0 0 439660007 315369 232001 1276 854368 13127 0 0 0 0 0 0
		12 wlan0 0x0 0 0 330187296 250652 0 0 329106990 236273 226202 1255 854104 13124 0 0 0 0 0 0
		13 wlan0 0x0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
		14 wlan0 0x0 1000 0 77113 272 56151 575 77113 272 0 0 0 0 19191 190 36960 385 0 0
		15 wlan0 0x0 1000 1 20227 80 8356 72 18539 74 1688 6 0 0 7562 66 794 6 0 0