Merge "Try to set the hop limit to something suitable for 64share" (666bb5cf) · Commits · e / os / android_frameworks_base

services/net/java/android/net/ip/RouterAdvertisementDaemon.java

+17 −5

Original line number	Diff line number	Diff line
		@@ -119,13 +119,23 @@ public class RouterAdvertisementDaemon {
		private volatile UnicastResponder mUnicastResponder;

		public static class RaParams {
		// Tethered traffic will have the hop limit properly decremented.
		// Consequently, set the hoplimit greater by one than the upstream
		// unicast hop limit.
		//
		// TODO: Dynamically pass down the IPV6_UNICAST_HOPS value from the
		// upstream interface for more correct behaviour.
		static final byte DEFAULT_HOPLIMIT = 65;

		public boolean hasDefaultRoute;
		public byte hopLimit;
		public int mtu;
		public HashSet<IpPrefix> prefixes;
		public HashSet<Inet6Address> dnses;

		public RaParams() {
		hasDefaultRoute = false;
		hopLimit = DEFAULT_HOPLIMIT;
		mtu = IPV6_MIN_MTU;
		prefixes = new HashSet<IpPrefix>();
		dnses = new HashSet<Inet6Address>();
		@@ -133,6 +143,7 @@ public class RouterAdvertisementDaemon {

		public RaParams(RaParams other) {
		hasDefaultRoute = other.hasDefaultRoute;
		hopLimit = other.hopLimit;
		mtu = other.mtu;
		prefixes = (HashSet) other.prefixes.clone();
		dnses = (HashSet) other.dnses.clone();
		@@ -273,10 +284,12 @@ public class RouterAdvertisementDaemon {
		final ByteBuffer ra = ByteBuffer.wrap(mRA);
		ra.order(ByteOrder.BIG_ENDIAN);

		final boolean haveRaParams = (mRaParams != null);
		boolean shouldSendRA = false;

		try {
		putHeader(ra, mRaParams != null && mRaParams.hasDefaultRoute);
		putHeader(ra, haveRaParams && mRaParams.hasDefaultRoute,
		haveRaParams ? mRaParams.hopLimit : RaParams.DEFAULT_HOPLIMIT);
		putSlla(ra, mInterface.macAddr.toByteArray());
		mRaLength = ra.position();

		@@ -287,7 +300,7 @@ public class RouterAdvertisementDaemon {
		//
		// putExpandedFlagsOption(ra);

		if (mRaParams != null) {
		if (haveRaParams) {
		putMtu(ra, mRaParams.mtu);
		mRaLength = ra.position();

		@@ -348,7 +361,7 @@ public class RouterAdvertisementDaemon {
		private static byte asByte(int value) { return (byte) value; }
		private static short asShort(int value) { return (short) value; }

		private static void putHeader(ByteBuffer ra, boolean hasDefaultRoute) {
		private static void putHeader(ByteBuffer ra, boolean hasDefaultRoute, byte hopLimit) {
		/**
		Router Advertisement Message Format

		@@ -366,11 +379,10 @@ public class RouterAdvertisementDaemon {
		\| Options ...
		+-+-+-+-+-+-+-+-+-+-+-+-
		*/
		final byte DEFAULT_HOPLIMIT = 64;
		ra.put(ICMPV6_ND_ROUTER_ADVERT)
		.put(asByte(0))
		.putShort(asShort(0))
		.put(DEFAULT_HOPLIMIT)
		.put(hopLimit)
		// RFC 4191 "high" preference, iff. advertising a default route.
		.put(hasDefaultRoute ? asByte(0x08) : asByte(0))
		.putShort(hasDefaultRoute ? asShort(DEFAULT_LIFETIME) : asShort(0))