diff options
Diffstat (limited to 'common/testutils/devicetests/com/android/testutils/NatInternalPacketForwarder.kt')
-rw-r--r-- | common/testutils/devicetests/com/android/testutils/NatInternalPacketForwarder.kt | 78 |
1 files changed, 0 insertions, 78 deletions
diff --git a/common/testutils/devicetests/com/android/testutils/NatInternalPacketForwarder.kt b/common/testutils/devicetests/com/android/testutils/NatInternalPacketForwarder.kt deleted file mode 100644 index fa39d19e..00000000 --- a/common/testutils/devicetests/com/android/testutils/NatInternalPacketForwarder.kt +++ /dev/null @@ -1,78 +0,0 @@ -/* - * Copyright (C) 2023 The Android Open Source Project - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - -package com.android.testutils - -import java.io.FileDescriptor -import java.net.InetAddress - -/** - * A class that forwards packets from the internal {@link TestNetworkInterface} to the external - * {@link TestNetworkInterface} with NAT. See {@link NatPacketForwarderBase} for detail. - */ -class NatInternalPacketForwarder( - srcFd: FileDescriptor, - mtu: Int, - dstFd: FileDescriptor, - extAddr: InetAddress, - natMap: PacketBridge.NatMap -) : NatPacketForwarderBase(srcFd, mtu, dstFd, extAddr, natMap) { - - /** - * Rewrite addresses, ports and fix up checksums for packets received on the internal - * interface. - * - * Outgoing packet from the internal interface which is being forwarded to the - * external interface with translated address, e.g. 192.168.1.1:5678 -> 8.8.8.8:80 - * will be translated into 8.8.8.8:1234 -> 1.2.3.4:80. - * - * The external port, e.g. 1234 in the above example, is the port number assigned by - * the forwarder when creating the mapping to identify the source address and port when - * the response is coming from the external interface. See {@link PacketBridge.NatMap} - * for detail. - */ - override fun preparePacketForForwarding(buf: ByteArray, len: Int, version: Int, proto: Int) { - val (addrPos, addrLen) = getAddressPositionAndLength(version) - - // TODO: support one external address per ip version. - val extAddrBuf = mExtAddr.address - if (addrLen != extAddrBuf.size) throw IllegalStateException("Packet IP version mismatch") - - val srcAddr = getInetAddressAt(buf, addrPos, addrLen) - - // Copy the original destination to into the source address. - for (i in 0 until addrLen) { - buf[addrPos + i] = buf[addrPos + addrLen + i] - } - - // Copy the external address into the destination address. - for (i in 0 until addrLen) { - buf[addrPos + addrLen + i] = extAddrBuf[i] - } - - // Add an entry to NAT mapping table. - val transportOffset = - if (version == 4) PacketReflector.IPV4_HEADER_LENGTH - else PacketReflector.IPV6_HEADER_LENGTH - val srcPort = getPortAt(buf, transportOffset) - val extPort = synchronized(mNatMap) { mNatMap.toExternalPort(srcAddr, srcPort, proto) } - // Copy the external port to into the source port. - setPortAt(extPort, buf, transportOffset) - - // Fix IP and Transport layer checksum. - fixPacketChecksum(buf, len, version, proto.toByte()) - } -} |