Ignore ipv6 tx traffic on clat uid.

Currently, 464xlat counts its ipv6 tx traffic into root uid.
When user is making ipv4 upload over ipv6-only network, ipv4
tx traffic may sometimes be counted faster then ipv6 tx
traffic.

Thus, NetworkStatsService may detect non-monotonic values due
to 464xlat adjustment.

So the solution is that: for clatd, make ipv6 tx traffic counts
into clat uid, and then ignore it in the framework side.

Bug: 118602783
Test: 1. manually verify clatd traffic on clat uid.
      2. runtest frameworks-net

Change-Id: Ifb478b79e3e281918c70e16d1f90682c78f33db1

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

@@ -832,25 +832,23 @@ public class NetworkStatsTest {
                 0 /* operations */);
 
         // Traffic measured for the root uid on the base interface if eBPF is in use.
-        // Incorrectly includes appEntry's bytes and packets, plus IPv4-IPv6 translation
-        // overhead (20 bytes per packet), only for TX traffic.
         final NetworkStats.Entry ebpfRootUidEntry = new NetworkStats.Entry(
                 baseIface, rootUid, SET_DEFAULT, TAG_NONE,
                 163577 /* rxBytes */,
                 187 /* rxPackets */,
-                1169942 /* txBytes */,
+                17607 /* txBytes */,
-                13902 /* txPackets */,
+                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 both directions.
+        // 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 */,
-                1169942 /* txBytes */,
+                17607 /* txBytes */,
-                13902 /* txPackets */,
+                97 /* txPackets */,
                 0 /* operations */);
 
         final NetworkStats.Entry otherEntry = new NetworkStats.Entry(

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

@@ -159,7 +159,7 @@ public class NetworkStatsFactoryTest {
         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, 5766L);
+        assertStatsEntry(stats, "wlan0", 0, SET_DEFAULT, 0x0, 15229L, 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);
@@ -170,6 +170,8 @@ public class NetworkStatsFactoryTest {
         assertStatsEntry(stats, "dummy0", 0, SET_DEFAULT, 0x0, 0L, 168L);
         assertStatsEntry(stats, "lo", 0, SET_DEFAULT, 0x0, 1288L, 1288L);
 
+        assertNoStatsEntry(stats, "wlan0", 1029, SET_DEFAULT, 0x0);
+
         NetworkStatsFactory.clearStackedIfaces();
     }
 
@@ -191,12 +193,12 @@ public class NetworkStatsFactoryTest {
         // 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, 647888L);
+        assertStatsEntry(stats, "wlan0", 0, SET_DEFAULT, 0x0, rootRxBytesBefore, 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, 647587L);
+        assertStatsEntry(stats, "wlan0", 0, SET_DEFAULT, 0x0, rootRxBytesAfter, 0L);
 
         NetworkStatsFactory.clearStackedIfaces();
     }
@@ -252,6 +254,15 @@ public class NetworkStatsFactoryTest {
         assertEquals("unexpected txBytes", txBytes, entry.txBytes);
     }
 
+    private static void assertNoStatsEntry(NetworkStats stats, String iface, int uid, int set,
+            int tag) {
+        final int i = stats.findIndex(iface, uid, set, tag, METERED_NO, ROAMING_NO,
+                DEFAULT_NETWORK_NO);
+        if (i >= 0) {
+            fail("unexpected NetworkStats entry at " + i);
+        }
+    }
+
     private static void assertStatsEntry(NetworkStats stats, String iface, int uid, int set,
             int tag, long rxBytes, long rxPackets, long txBytes, long txPackets) {
         final int i = stats.findIndex(iface, uid, set, tag, METERED_NO, ROAMING_NO,

tests/net/res/raw/xt_qtaguid_with_clat

@@ -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 312046 5113 11043898 7811 13117 61 1656 20 306544 5046 3230 38 2272 29
+10 wlan0 0x0 0 0 11058671 7892 0 0 11043898 7811 13117 61 1656 20 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
@@ -41,3 +41,5 @@ idx iface acct_tag_hex uid_tag_int cnt_set rx_bytes rx_packets tx_bytes tx_packe
 41 dummy0 0x0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
 42 lo 0x0 0 0 1288 16 1288 16 0 0 532 8 756 8 0 0 532 8 756 8
 43 lo 0x0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
+44 wlan0 0x0 1029 0 0 0 312046 5113 0 0 0 0 0 0 306544 5046 3230 38 2272 29
+45 wlan0 0x0 1029 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

@@ -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 8524052 130894 439660007 315369 232001 1276 854368 13127 7871216 121284 108568 1325 544268 8285
+12 wlan0 0x0 0 0 440746376 329772 0 0 439660007 315369 232001 1276 854368 13127 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
@@ -185,3 +185,5 @@ idx iface acct_tag_hex uid_tag_int cnt_set rx_bytes rx_packets tx_bytes tx_packe
 185 wlan0 0xffffff0900000000 1000 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
 186 dummy0 0x0 0 0 0 0 168 3 0 0 0 0 0 0 0 0 0 0 168 3
 187 dummy0 0x0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
+188 wlan0 0x0 1029 0 0 0 8524052 130894 0 0 0 0 0 0 7871216 121284 108568 1325 544268 8285
+189 wlan0 0x0 1029 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_before

@@ -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 1488 12 1488 12 0 0 1488 12 0 0 0 0 1488 12 0 0
 11 v4-wlan0 0x0 10106 1 323981189 235142 3509032 84542 323979453 235128 1736 14 0 0 3502676 84363 6356 179 0 0
-12 wlan0 0x0 0 0 330187296 250652 5855801 94173 329106990 236273 226202 1255 854104 13124 5208040 84634 103637 1256 544124 8283
+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
@@ -183,3 +183,5 @@ idx iface acct_tag_hex uid_tag_int cnt_set rx_bytes rx_packets tx_bytes tx_packe
 183 wlan0 0xffffff0900000000 1000 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
 184 dummy0 0x0 0 0 0 0 168 3 0 0 0 0 0 0 0 0 0 0 168 3
 185 dummy0 0x0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
+186 wlan0 0x0 1029 0 0 0 5855801 94173 0 0 0 0 0 0 5208040 84634 103637 1256 544124 8283
+187 wlan0 0x0 1029 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_simple

@@ -1,5 +1,6 @@
 idx iface acct_tag_hex uid_tag_int cnt_set rx_bytes rx_packets tx_bytes tx_packets rx_tcp_bytes rx_tcp_packets rx_udp_bytes rx_udp_packets rx_other_bytes rx_other_packets tx_tcp_bytes tx_tcp_packets tx_udp_bytes tx_udp_packets tx_other_bytes tx_other_packets
-2 v4-wlan0 0x0 10060 0 42600 213 4100 41 42600 213 4100 41 0 0 0 0 0 0 0 0
+2 v4-wlan0 0x0 10060 0 42600 213 4100 41 42600 213 0 0 0 0 4100 41 0 0 0 0
 3 v4-wlan0 0x0 10060 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
-4 wlan0 0x0 0 0 46860 213 4920 41 46860 213 4920 41 0 0 0 0 0 0 0 0
+4 wlan0 0x0 0 0 46860 213 0 0 46860 213 0 0 0 0 0 0 0 0 0 0
 5 wlan0 0x0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
+6 wlan0 0x0 1029 0 0 0 4920 41 0 0 0 0 0 0 4920 41 0 0 0 0