[TCPKeepalive] Fill correct TOS and TTL value

Fill correct TOS/TTL value by fetching them from kernel with
getsockopt.

bug: 123967966
Test: -build, flash, boot
      -atest FrameworksNetTests

Change-Id: I75b1be51040b4a381163958b4cddd27dbb22bac1

services/core/java/com/android/server/connectivity/TcpKeepaliveController.java

@@ -23,7 +23,10 @@ import static android.os.MessageQueue.OnFileDescriptorEventListener.EVENT_ERROR;
 import static android.os.MessageQueue.OnFileDescriptorEventListener.EVENT_INPUT;
 import static android.system.OsConstants.ENOPROTOOPT;
 import static android.system.OsConstants.FIONREAD;
+import static android.system.OsConstants.IPPROTO_IP;
 import static android.system.OsConstants.IPPROTO_TCP;
+import static android.system.OsConstants.IP_TOS;
+import static android.system.OsConstants.IP_TTL;
 import static android.system.OsConstants.TIOCOUTQ;
 
 import android.annotation.NonNull;
@@ -193,6 +196,12 @@ public class TcpKeepaliveController {
             trw = NetworkUtils.getTcpRepairWindow(fd);
             tcpDetails.rcvWnd = trw.rcvWnd;
             tcpDetails.rcvWndScale = trw.rcvWndScale;
+            if (tcpDetails.srcAddress.length == 4 /* V4 address length */) {
+                // Query TOS.
+                tcpDetails.tos = Os.getsockoptInt(fd, IPPROTO_IP, IP_TOS);
+                // Query TTL.
+                tcpDetails.ttl = Os.getsockoptInt(fd, IPPROTO_IP, IP_TTL);
+            }
         } catch (ErrnoException e) {
             Log.e(TAG, "Exception reading TCP state from socket", e);
             if (e.errno == ENOPROTOOPT) {

tests/net/java/android/net/TcpKeepalivePacketDataTest.java

@@ -48,6 +48,8 @@ public final class TcpKeepalivePacketDataTest {
         final int ack = 0x22222222;
         final int wnd = 8000;
         final int wndScale = 2;
+        final int tos = 4;
+        final int ttl = 64;
         TcpKeepalivePacketData resultData = null;
         final TcpKeepalivePacketDataParcelable testInfo = new TcpKeepalivePacketDataParcelable();
         testInfo.srcAddress = IPV4_KEEPALIVE_SRC_ADDR;
@@ -58,6 +60,8 @@ public final class TcpKeepalivePacketDataTest {
         testInfo.ack = ack;
         testInfo.rcvWnd = wnd;
         testInfo.rcvWndScale = wndScale;
+        testInfo.tos = tos;
+        testInfo.ttl = ttl;
         try {
             resultData = TcpKeepalivePacketData.tcpKeepalivePacket(testInfo);
         } catch (InvalidPacketException e) {
@@ -72,16 +76,21 @@ public final class TcpKeepalivePacketDataTest {
         assertEquals(testInfo.ack, resultData.tcpAck);
         assertEquals(testInfo.rcvWnd, resultData.tcpWnd);
         assertEquals(testInfo.rcvWndScale, resultData.tcpWndScale);
+        assertEquals(testInfo.tos, resultData.ipTos);
+        assertEquals(testInfo.ttl, resultData.ipTtl);
 
         TestUtils.assertParcelingIsLossless(resultData, TcpKeepalivePacketData.CREATOR);
 
         final byte[] packet = resultData.getPacket();
-        // IP version and TOS.
+        // IP version and IHL
-        ByteBuffer buf = ByteBuffer.wrap(packet);
+        assertEquals(packet[0], 0x45);
-        assertEquals(buf.getShort(), 0x4500);
+        // TOS
+        assertEquals(packet[1], tos);
+        // TTL
+        assertEquals(packet[8], ttl);
         // Source IP address.
         byte[] ip = new byte[4];
-        buf = ByteBuffer.wrap(packet, 12, 4);
+        ByteBuffer buf = ByteBuffer.wrap(packet, 12, 4);
         buf.get(ip);
         assertArrayEquals(ip, IPV4_KEEPALIVE_SRC_ADDR);
         // Destination IP address.
@@ -113,6 +122,8 @@ public final class TcpKeepalivePacketDataTest {
         final int ack = 0x22222222;
         final int wnd = 48_000;
         final int wndScale = 2;
+        final int tos = 4;
+        final int ttl = 64;
         final TcpKeepalivePacketDataParcelable testInfo = new TcpKeepalivePacketDataParcelable();
         testInfo.srcAddress = IPV4_KEEPALIVE_SRC_ADDR;
         testInfo.srcPort = srcPort;
@@ -122,6 +133,8 @@ public final class TcpKeepalivePacketDataTest {
         testInfo.ack = ack;
         testInfo.rcvWnd = wnd;
         testInfo.rcvWndScale = wndScale;
+        testInfo.tos = tos;
+        testInfo.ttl = ttl;
         TcpKeepalivePacketData testData = null;
         TcpKeepalivePacketDataParcelable resultData = null;
         testData = TcpKeepalivePacketData.tcpKeepalivePacket(testInfo);
@@ -134,5 +147,7 @@ public final class TcpKeepalivePacketDataTest {
         assertEquals(resultData.ack, ack);
         assertEquals(resultData.rcvWnd, wnd);
         assertEquals(resultData.rcvWndScale, wndScale);
+        assertEquals(resultData.tos, tos);
+        assertEquals(resultData.ttl, ttl);
     }
 }