Merge "Ignore flow label when comparing RAs in APF" (81fda778) · Commits · e / os / android_frameworks_base

services/net/java/android/net/apf/ApfFilter.java

+22 −2

Original line number	Diff line number	Diff line
		@@ -193,6 +193,11 @@ public class ApfFilter {
		private static final int IPV4_ANY_HOST_ADDRESS = 0;
		private static final int IPV4_BROADCAST_ADDRESS = -1; // 255.255.255.255

		// Traffic class and Flow label are not byte aligned. Luckily we
		// don't care about either value so we'll consider bytes 1-3 of the
		// IPv6 header as don't care.
		private static final int IPV6_FLOW_LABEL_OFFSET = ETH_HEADER_LEN + 1;
		private static final int IPV6_FLOW_LABEL_LEN = 3;
		private static final int IPV6_NEXT_HEADER_OFFSET = ETH_HEADER_LEN + 6;
		private static final int IPV6_SRC_ADDR_OFFSET = ETH_HEADER_LEN + 8;
		private static final int IPV6_DEST_ADDR_OFFSET = ETH_HEADER_LEN + 24;
		@@ -472,8 +477,13 @@ public class ApfFilter {

		RaEvent.Builder builder = new RaEvent.Builder();

		// Ignore the checksum.
		// Ignore the flow label and low 4 bits of traffic class.
		int lastNonLifetimeStart = addNonLifetime(0,
		IPV6_FLOW_LABEL_OFFSET,
		IPV6_FLOW_LABEL_LEN);

		// Ignore the checksum.
		lastNonLifetimeStart = addNonLifetime(lastNonLifetimeStart,
		ICMP6_RA_CHECKSUM_OFFSET,
		ICMP6_RA_CHECKSUM_LEN);

		@@ -564,6 +574,11 @@ public class ApfFilter {
		for (int i = 0; (i + 1) < mNonLifetimes.size(); i++) {
		int offset = mNonLifetimes.get(i).first + mNonLifetimes.get(i).second;

		// The flow label is in mNonLifetimes, but it's not a lifetime.
		if (offset == IPV6_FLOW_LABEL_OFFSET) {
		continue;
		}

		// The checksum is in mNonLifetimes, but it's not a lifetime.
		if (offset == ICMP6_RA_CHECKSUM_OFFSET) {
		continue;
		@@ -628,6 +643,11 @@ public class ApfFilter {
		if ((i + 1) < mNonLifetimes.size()) {
		Pair<Integer, Integer> nextNonLifetime = mNonLifetimes.get(i + 1);
		int offset = nonLifetime.first + nonLifetime.second;

		// Skip the Flow label.
		if (offset == IPV6_FLOW_LABEL_OFFSET) {
		continue;
		}
		// Skip the checksum.
		if (offset == ICMP6_RA_CHECKSUM_OFFSET) {
		continue;

tests/net/java/android/net/apf/ApfTest.java

+13 −0

Original line number	Diff line number	Diff line
		@@ -1066,10 +1066,15 @@ public class ApfTest extends AndroidTestCase {
		final int ROUTE_LIFETIME = 400;
		// Note that lifetime of 2000 will be ignored in favor of shorter route lifetime of 1000.
		final int DNSSL_LIFETIME = 2000;
		final int VERSION_TRAFFIC_CLASS_FLOW_LABEL_OFFSET = ETH_HEADER_LEN;
		// IPv6, traffic class = 0, flow label = 0x12345
		final int VERSION_TRAFFIC_CLASS_FLOW_LABEL = 0x60012345;

		// Verify RA is passed the first time
		ByteBuffer basePacket = ByteBuffer.wrap(new byte[ICMP6_RA_OPTION_OFFSET]);
		basePacket.putShort(ETH_ETHERTYPE_OFFSET, (short)ETH_P_IPV6);
		basePacket.putInt(VERSION_TRAFFIC_CLASS_FLOW_LABEL_OFFSET,
		VERSION_TRAFFIC_CLASS_FLOW_LABEL);
		basePacket.put(IPV6_NEXT_HEADER_OFFSET, (byte)IPPROTO_ICMPV6);
		basePacket.put(ICMP6_TYPE_OFFSET, (byte)ICMP6_ROUTER_ADVERTISEMENT);
		basePacket.putShort(ICMP6_RA_ROUTER_LIFETIME_OFFSET, (short)ROUTER_LIFETIME);
		@@ -1080,6 +1085,13 @@ public class ApfTest extends AndroidTestCase {
		testRaLifetime(apfFilter, ipManagerCallback, basePacket, ROUTER_LIFETIME);
		verifyRaEvent(new RaEvent(ROUTER_LIFETIME, -1, -1, -1, -1, -1));

		ByteBuffer newFlowLabelPacket = ByteBuffer.wrap(new byte[ICMP6_RA_OPTION_OFFSET]);
		basePacket.clear();
		newFlowLabelPacket.put(basePacket);
		// Check that changes are ignored in every byte of the flow label.
		newFlowLabelPacket.putInt(VERSION_TRAFFIC_CLASS_FLOW_LABEL_OFFSET,
		VERSION_TRAFFIC_CLASS_FLOW_LABEL + 0x11111);

		// Ensure zero-length options cause the packet to be silently skipped.
		// Do this before we test other packets. http://b/29586253
		ByteBuffer zeroLengthOptionPacket = ByteBuffer.wrap(
		@@ -1145,6 +1157,7 @@ public class ApfTest extends AndroidTestCase {
		// Verify that current program filters all five RAs:
		program = ipManagerCallback.getApfProgram();
		verifyRaLifetime(program, basePacket, ROUTER_LIFETIME);
		verifyRaLifetime(program, newFlowLabelPacket, ROUTER_LIFETIME);
		verifyRaLifetime(program, prefixOptionPacket, PREFIX_PREFERRED_LIFETIME);
		verifyRaLifetime(program, rdnssOptionPacket, RDNSS_LIFETIME);
		verifyRaLifetime(program, routeInfoOptionPacket, ROUTE_LIFETIME);