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Merge "Don\'t drop IPv4 broadcast packets when WiFi multicast lock is held" into nyc-dev am: 83e50327fc

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am: ae8f345d15

* commit 'ae8f345d155a9aa29bce107c6675e2da8ed61a8b':
  Don't drop IPv4 broadcast packets when WiFi multicast lock is held

Change-Id: I5b544fe6e52a41d508932c2747294b20862d7ffe
This commit is contained in:
Paul Jensen
2016-05-27 15:08:05 +00:00
committed by android-build-merger
parent 758cfdc79b ae8f345d15
commit 4aa3ffcded
2 changed files with 58 additions and 46 deletions
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53
services/net/java/android/net/apf/ApfFilter.java
View File

@@ -597,12 +597,13 @@ public class ApfFilter {
private void generateIPv4FilterLocked(ApfGenerator gen) throws IllegalInstructionException {
// Here's a basic summary of what the IPv4 filter program does:
//
// if it's multicast and we're dropping multicast:
// drop
// if it's not broadcast:
// pass
// if it's not DHCP destined to our MAC:
// drop
// if filtering multicast (i.e. multicast lock not held):
// if it's multicast:
// drop
// if it's not broadcast:
// pass
// if it's not DHCP destined to our MAC:
// drop
// pass
if (mMulticastFilter) {
@@ -610,27 +611,27 @@ public class ApfFilter {
gen.addLoad8(Register.R0, IPV4_DEST_ADDR_OFFSET);
gen.addAnd(0xf0);
gen.addJumpIfR0Equals(0xe0, gen.DROP_LABEL);
}
// Drop all broadcasts besides DHCP addressed to us
// If not a broadcast packet, pass
gen.addLoadImmediate(Register.R0, ETH_DEST_ADDR_OFFSET);
gen.addJumpIfBytesNotEqual(Register.R0, ETH_BROADCAST_MAC_ADDRESS, gen.PASS_LABEL);
// If not UDP, drop
gen.addLoad8(Register.R0, IPV4_PROTOCOL_OFFSET);
gen.addJumpIfR0NotEquals(IPPROTO_UDP, gen.DROP_LABEL);
// If fragment, drop. This matches the BPF filter installed by the DHCP client.
gen.addLoad16(Register.R0, IPV4_FRAGMENT_OFFSET_OFFSET);
gen.addJumpIfR0AnyBitsSet(IPV4_FRAGMENT_OFFSET_MASK, gen.DROP_LABEL);
// If not to DHCP client port, drop
gen.addLoadFromMemory(Register.R1, gen.IPV4_HEADER_SIZE_MEMORY_SLOT);
gen.addLoad16Indexed(Register.R0, UDP_DESTINATION_PORT_OFFSET);
gen.addJumpIfR0NotEquals(DHCP_CLIENT_PORT, gen.DROP_LABEL);
// If not DHCP to our MAC address, drop
gen.addLoadImmediate(Register.R0, DHCP_CLIENT_MAC_OFFSET);
// NOTE: Relies on R1 containing IPv4 header offset.
gen.addAddR1();
gen.addJumpIfBytesNotEqual(Register.R0, mHardwareAddress, gen.DROP_LABEL);
// Drop all broadcasts besides DHCP addressed to us
// If not a broadcast packet, pass
gen.addLoadImmediate(Register.R0, ETH_DEST_ADDR_OFFSET);
gen.addJumpIfBytesNotEqual(Register.R0, ETH_BROADCAST_MAC_ADDRESS, gen.PASS_LABEL);
// If not UDP, drop
gen.addLoad8(Register.R0, IPV4_PROTOCOL_OFFSET);
gen.addJumpIfR0NotEquals(IPPROTO_UDP, gen.DROP_LABEL);
// If fragment, drop. This matches the BPF filter installed by the DHCP client.
gen.addLoad16(Register.R0, IPV4_FRAGMENT_OFFSET_OFFSET);
gen.addJumpIfR0AnyBitsSet(IPV4_FRAGMENT_OFFSET_MASK, gen.DROP_LABEL);
// If not to DHCP client port, drop
gen.addLoadFromMemory(Register.R1, gen.IPV4_HEADER_SIZE_MEMORY_SLOT);
gen.addLoad16Indexed(Register.R0, UDP_DESTINATION_PORT_OFFSET);
gen.addJumpIfR0NotEquals(DHCP_CLIENT_PORT, gen.DROP_LABEL);
// If not DHCP to our MAC address, drop
gen.addLoadImmediate(Register.R0, DHCP_CLIENT_MAC_OFFSET);
// NOTE: Relies on R1 containing IPv4 header offset.
gen.addAddR1();
gen.addJumpIfBytesNotEqual(Register.R0, mHardwareAddress, gen.DROP_LABEL);
}
// Otherwise, pass
gen.addJump(gen.PASS_LABEL);

51
services/tests/servicestests/src/android/net/apf/ApfTest.java
View File

@@ -663,7 +663,7 @@ public class ApfTest extends AndroidTestCase {
@LargeTest
public void testApfFilterIPv4() throws Exception {
MockIpManagerCallback ipManagerCallback = new MockIpManagerCallback();
ApfFilter apfFilter = new TestApfFilter(ipManagerCallback, false /* multicastFilter */);
ApfFilter apfFilter = new TestApfFilter(ipManagerCallback, true /* multicastFilter */);
byte[] program = ipManagerCallback.getApfProgram();
// Verify empty packet of 100 zero bytes is passed
@@ -726,46 +726,57 @@ public class ApfTest extends AndroidTestCase {
byte[] program = ipManagerCallback.getApfProgram();
// Construct IPv4 and IPv6 multicast packets.
ByteBuffer v4packet = ByteBuffer.wrap(new byte[100]);
v4packet.putShort(ETH_ETHERTYPE_OFFSET, (short)ETH_P_IP);
v4packet.position(IPV4_DEST_ADDR_OFFSET);
v4packet.put(new byte[]{(byte)224,0,0,1});
ByteBuffer mcastv4packet = ByteBuffer.wrap(new byte[100]);
mcastv4packet.putShort(ETH_ETHERTYPE_OFFSET, (short)ETH_P_IP);
mcastv4packet.position(IPV4_DEST_ADDR_OFFSET);
mcastv4packet.put(new byte[]{(byte)224,0,0,1});
ByteBuffer v6packet = ByteBuffer.wrap(new byte[100]);
v6packet.putShort(ETH_ETHERTYPE_OFFSET, (short)ETH_P_IPV6);
v6packet.put(IPV6_NEXT_HEADER_OFFSET, (byte)IPPROTO_UDP);
v6packet.position(IPV6_DEST_ADDR_OFFSET);
v6packet.put(new byte[]{(byte)0xff,2,0,0,0,0,0,0,0,0,0,0,0,0,0,(byte)0xfb});
ByteBuffer mcastv6packet = ByteBuffer.wrap(new byte[100]);
mcastv6packet.putShort(ETH_ETHERTYPE_OFFSET, (short)ETH_P_IPV6);
mcastv6packet.put(IPV6_NEXT_HEADER_OFFSET, (byte)IPPROTO_UDP);
mcastv6packet.position(IPV6_DEST_ADDR_OFFSET);
mcastv6packet.put(new byte[]{(byte)0xff,2,0,0,0,0,0,0,0,0,0,0,0,0,0,(byte)0xfb});
// Construct IPv4 broadcast packet.
ByteBuffer bcastv4packet = ByteBuffer.wrap(new byte[100]);
bcastv4packet.put(ETH_BROADCAST_MAC_ADDRESS);
bcastv4packet.putShort(ETH_ETHERTYPE_OFFSET, (short)ETH_P_IP);
bcastv4packet.position(IPV4_DEST_ADDR_OFFSET);
bcastv4packet.put(new byte[]{(byte)192,(byte)0,(byte)2,(byte)63});
// Verify initially disabled multicast filter is off
assertPass(program, v4packet.array(), 0);
assertPass(program, v6packet.array(), 0);
assertPass(program, bcastv4packet.array(), 0);
assertPass(program, mcastv4packet.array(), 0);
assertPass(program, mcastv6packet.array(), 0);
// Turn on multicast filter and verify it works
ipManagerCallback.resetApfProgramWait();
apfFilter.setMulticastFilter(true);
program = ipManagerCallback.getApfProgram();
assertDrop(program, v4packet.array(), 0);
assertDrop(program, v6packet.array(), 0);
assertDrop(program, bcastv4packet.array(), 0);
assertDrop(program, mcastv4packet.array(), 0);
assertDrop(program, mcastv6packet.array(), 0);
// Turn off multicast filter and verify it's off
ipManagerCallback.resetApfProgramWait();
apfFilter.setMulticastFilter(false);
program = ipManagerCallback.getApfProgram();
assertPass(program, v4packet.array(), 0);
assertPass(program, v6packet.array(), 0);
assertPass(program, bcastv4packet.array(), 0);
assertPass(program, mcastv4packet.array(), 0);
assertPass(program, mcastv6packet.array(), 0);
// Verify it can be initialized to on
ipManagerCallback.resetApfProgramWait();
apfFilter.shutdown();
apfFilter = new TestApfFilter(ipManagerCallback, true /* multicastFilter */);
program = ipManagerCallback.getApfProgram();
assertDrop(program, v4packet.array(), 0);
assertDrop(program, v6packet.array(), 0);
assertDrop(program, bcastv4packet.array(), 0);
assertDrop(program, mcastv4packet.array(), 0);
assertDrop(program, mcastv6packet.array(), 0);
// Verify that ICMPv6 multicast is not dropped.
v6packet.put(IPV6_NEXT_HEADER_OFFSET, (byte)IPPROTO_ICMPV6);
assertPass(program, v6packet.array(), 0);
mcastv6packet.put(IPV6_NEXT_HEADER_OFFSET, (byte)IPPROTO_ICMPV6);
assertPass(program, mcastv6packet.array(), 0);
apfFilter.shutdown();
}