Move shared packages to NetworkStack project
Both were already statically linked both in the NetworkStack module and
the framework, so this change only reorganizes the file locations.
It makes more sense to have the library files in the NetworkStack module
folder, as changes to these files will be released with the same cadence
as the module, not the framework.
Bug: 139106271
Test: built, flashed, WiFi working
Change-Id: Ibcf9967ebb837e7f3c012a5dd7bf8917344e2ee5
diff --git a/common/netlinkclient/Android.bp b/common/netlinkclient/Android.bp
new file mode 100644
index 0000000..32e6d56
--- /dev/null
+++ b/common/netlinkclient/Android.bp
@@ -0,0 +1,27 @@
+//
+// Copyright (C) 2018 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.
+//
+
+java_library {
+ name: "netlink-client",
+ srcs: [
+ "src/**/*.java",
+ ":framework-networkstack-shared-srcs",
+ ],
+ libs: [
+ "androidx.annotation_annotation",
+ ],
+ sdk_version: "system_current",
+}
\ No newline at end of file
diff --git a/common/netlinkclient/src/android/net/netlink/ConntrackMessage.java b/common/netlinkclient/src/android/net/netlink/ConntrackMessage.java
new file mode 100644
index 0000000..6978739
--- /dev/null
+++ b/common/netlinkclient/src/android/net/netlink/ConntrackMessage.java
@@ -0,0 +1,109 @@
+/*
+ * Copyright (C) 2017 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 android.net.netlink;
+
+import static android.net.netlink.StructNlMsgHdr.NLM_F_ACK;
+import static android.net.netlink.StructNlMsgHdr.NLM_F_REPLACE;
+import static android.net.netlink.StructNlMsgHdr.NLM_F_REQUEST;
+
+import static java.nio.ByteOrder.BIG_ENDIAN;
+
+import android.system.OsConstants;
+
+import java.net.Inet4Address;
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+
+
+/**
+ * A NetlinkMessage subclass for netlink conntrack messages.
+ *
+ * see also: <linux_src>/include/uapi/linux/netfilter/nfnetlink_conntrack.h
+ *
+ * @hide
+ */
+public class ConntrackMessage extends NetlinkMessage {
+ public static final int STRUCT_SIZE = StructNlMsgHdr.STRUCT_SIZE + StructNfGenMsg.STRUCT_SIZE;
+
+ public static final short NFNL_SUBSYS_CTNETLINK = 1;
+ public static final short IPCTNL_MSG_CT_NEW = 0;
+
+ // enum ctattr_type
+ public static final short CTA_TUPLE_ORIG = 1;
+ public static final short CTA_TUPLE_REPLY = 2;
+ public static final short CTA_TIMEOUT = 7;
+
+ // enum ctattr_tuple
+ public static final short CTA_TUPLE_IP = 1;
+ public static final short CTA_TUPLE_PROTO = 2;
+
+ // enum ctattr_ip
+ public static final short CTA_IP_V4_SRC = 1;
+ public static final short CTA_IP_V4_DST = 2;
+
+ // enum ctattr_l4proto
+ public static final short CTA_PROTO_NUM = 1;
+ public static final short CTA_PROTO_SRC_PORT = 2;
+ public static final short CTA_PROTO_DST_PORT = 3;
+
+ public static byte[] newIPv4TimeoutUpdateRequest(
+ int proto, Inet4Address src, int sport, Inet4Address dst, int dport, int timeoutSec) {
+ // *** STYLE WARNING ***
+ //
+ // Code below this point uses extra block indentation to highlight the
+ // packing of nested tuple netlink attribute types.
+ final StructNlAttr ctaTupleOrig = new StructNlAttr(CTA_TUPLE_ORIG,
+ new StructNlAttr(CTA_TUPLE_IP,
+ new StructNlAttr(CTA_IP_V4_SRC, src),
+ new StructNlAttr(CTA_IP_V4_DST, dst)),
+ new StructNlAttr(CTA_TUPLE_PROTO,
+ new StructNlAttr(CTA_PROTO_NUM, (byte) proto),
+ new StructNlAttr(CTA_PROTO_SRC_PORT, (short) sport, BIG_ENDIAN),
+ new StructNlAttr(CTA_PROTO_DST_PORT, (short) dport, BIG_ENDIAN)));
+
+ final StructNlAttr ctaTimeout = new StructNlAttr(CTA_TIMEOUT, timeoutSec, BIG_ENDIAN);
+
+ final int payloadLength = ctaTupleOrig.getAlignedLength() + ctaTimeout.getAlignedLength();
+ final byte[] bytes = new byte[STRUCT_SIZE + payloadLength];
+ final ByteBuffer byteBuffer = ByteBuffer.wrap(bytes);
+ byteBuffer.order(ByteOrder.nativeOrder());
+
+ final ConntrackMessage ctmsg = new ConntrackMessage();
+ ctmsg.mHeader.nlmsg_len = bytes.length;
+ ctmsg.mHeader.nlmsg_type = (NFNL_SUBSYS_CTNETLINK << 8) | IPCTNL_MSG_CT_NEW;
+ ctmsg.mHeader.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | NLM_F_REPLACE;
+ ctmsg.mHeader.nlmsg_seq = 1;
+ ctmsg.pack(byteBuffer);
+
+ ctaTupleOrig.pack(byteBuffer);
+ ctaTimeout.pack(byteBuffer);
+
+ return bytes;
+ }
+
+ protected StructNfGenMsg mNfGenMsg;
+
+ private ConntrackMessage() {
+ super(new StructNlMsgHdr());
+ mNfGenMsg = new StructNfGenMsg((byte) OsConstants.AF_INET);
+ }
+
+ public void pack(ByteBuffer byteBuffer) {
+ mHeader.pack(byteBuffer);
+ mNfGenMsg.pack(byteBuffer);
+ }
+}
diff --git a/common/netlinkclient/src/android/net/netlink/InetDiagMessage.java b/common/netlinkclient/src/android/net/netlink/InetDiagMessage.java
new file mode 100644
index 0000000..ca07630
--- /dev/null
+++ b/common/netlinkclient/src/android/net/netlink/InetDiagMessage.java
@@ -0,0 +1,221 @@
+/*
+ * Copyright (C) 2018 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 android.net.netlink;
+
+import static android.net.netlink.NetlinkConstants.SOCK_DIAG_BY_FAMILY;
+import static android.net.netlink.NetlinkSocket.DEFAULT_RECV_BUFSIZE;
+import static android.net.netlink.StructNlMsgHdr.NLM_F_DUMP;
+import static android.net.netlink.StructNlMsgHdr.NLM_F_REQUEST;
+import static android.os.Process.INVALID_UID;
+import static android.system.OsConstants.AF_INET;
+import static android.system.OsConstants.AF_INET6;
+import static android.system.OsConstants.IPPROTO_UDP;
+import static android.system.OsConstants.NETLINK_INET_DIAG;
+
+import android.annotation.Nullable;
+import android.net.util.SocketUtils;
+import android.system.ErrnoException;
+import android.util.Log;
+
+import java.io.FileDescriptor;
+import java.io.IOException;
+import java.io.InterruptedIOException;
+import java.net.Inet4Address;
+import java.net.Inet6Address;
+import java.net.InetSocketAddress;
+import java.net.SocketException;
+import java.net.UnknownHostException;
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+
+/**
+ * A NetlinkMessage subclass for netlink inet_diag messages.
+ *
+ * see also: <linux_src>/include/uapi/linux/inet_diag.h
+ *
+ * @hide
+ */
+public class InetDiagMessage extends NetlinkMessage {
+ public static final String TAG = "InetDiagMessage";
+ private static final int TIMEOUT_MS = 500;
+
+ public static byte[] InetDiagReqV2(int protocol, InetSocketAddress local,
+ InetSocketAddress remote, int family, short flags) {
+ return InetDiagReqV2(protocol, local, remote, family, flags, 0 /* pad */,
+ 0 /* idiagExt */, StructInetDiagReqV2.INET_DIAG_REQ_V2_ALL_STATES);
+ }
+
+ /**
+ * Construct an inet_diag_req_v2 message. This method will throw {@code NullPointerException}
+ * if local and remote are not both null or both non-null.
+ *
+ * @param protocol the request protocol type. This should be set to one of IPPROTO_TCP,
+ * IPPROTO_UDP, or IPPROTO_UDPLITE.
+ * @param local local socket address of the target socket. This will be packed into a
+ * {@Code StructInetDiagSockId}. Request to diagnose for all sockets if both of
+ * local or remote address is null.
+ * @param remote remote socket address of the target socket. This will be packed into a
+ * {@Code StructInetDiagSockId}. Request to diagnose for all sockets if both of
+ * local or remote address is null.
+ * @param family the ip family of the request message. This should be set to either AF_INET or
+ * AF_INET6 for IPv4 or IPv6 sockets respectively.
+ * @param flags message flags. See <linux_src>/include/uapi/linux/netlink.h.
+ * @param pad for raw socket protocol specification.
+ * @param idiagExt a set of flags defining what kind of extended information to report.
+ * @param state a bit mask that defines a filter of socket states.
+ *
+ * @return bytes array representation of the message
+ **/
+ public static byte[] InetDiagReqV2(int protocol, @Nullable InetSocketAddress local,
+ @Nullable InetSocketAddress remote, int family, short flags, int pad, int idiagExt,
+ int state) throws NullPointerException {
+ final byte[] bytes = new byte[StructNlMsgHdr.STRUCT_SIZE + StructInetDiagReqV2.STRUCT_SIZE];
+ final ByteBuffer byteBuffer = ByteBuffer.wrap(bytes);
+ byteBuffer.order(ByteOrder.nativeOrder());
+
+ final StructNlMsgHdr nlMsgHdr = new StructNlMsgHdr();
+ nlMsgHdr.nlmsg_len = bytes.length;
+ nlMsgHdr.nlmsg_type = SOCK_DIAG_BY_FAMILY;
+ nlMsgHdr.nlmsg_flags = flags;
+ nlMsgHdr.pack(byteBuffer);
+ final StructInetDiagReqV2 inetDiagReqV2 =
+ new StructInetDiagReqV2(protocol, local, remote, family, pad, idiagExt, state);
+
+ inetDiagReqV2.pack(byteBuffer);
+ return bytes;
+ }
+
+ public StructInetDiagMsg mStructInetDiagMsg;
+
+ private InetDiagMessage(StructNlMsgHdr header) {
+ super(header);
+ mStructInetDiagMsg = new StructInetDiagMsg();
+ }
+
+ public static InetDiagMessage parse(StructNlMsgHdr header, ByteBuffer byteBuffer) {
+ final InetDiagMessage msg = new InetDiagMessage(header);
+ msg.mStructInetDiagMsg = StructInetDiagMsg.parse(byteBuffer);
+ return msg;
+ }
+
+ private static int lookupUidByFamily(int protocol, InetSocketAddress local,
+ InetSocketAddress remote, int family, short flags,
+ FileDescriptor fd)
+ throws ErrnoException, InterruptedIOException {
+ byte[] msg = InetDiagReqV2(protocol, local, remote, family, flags);
+ NetlinkSocket.sendMessage(fd, msg, 0, msg.length, TIMEOUT_MS);
+ ByteBuffer response = NetlinkSocket.recvMessage(fd, DEFAULT_RECV_BUFSIZE, TIMEOUT_MS);
+
+ final NetlinkMessage nlMsg = NetlinkMessage.parse(response);
+ final StructNlMsgHdr hdr = nlMsg.getHeader();
+ if (hdr.nlmsg_type == NetlinkConstants.NLMSG_DONE) {
+ return INVALID_UID;
+ }
+ if (nlMsg instanceof InetDiagMessage) {
+ return ((InetDiagMessage) nlMsg).mStructInetDiagMsg.idiag_uid;
+ }
+ return INVALID_UID;
+ }
+
+ private static final int FAMILY[] = {AF_INET6, AF_INET};
+
+ private static int lookupUid(int protocol, InetSocketAddress local,
+ InetSocketAddress remote, FileDescriptor fd)
+ throws ErrnoException, InterruptedIOException {
+ int uid;
+
+ for (int family : FAMILY) {
+ /**
+ * For exact match lookup, swap local and remote for UDP lookups due to kernel
+ * bug which will not be fixed. See aosp/755889 and
+ * https://www.mail-archive.com/netdev@vger.kernel.org/msg248638.html
+ */
+ if (protocol == IPPROTO_UDP) {
+ uid = lookupUidByFamily(protocol, remote, local, family, NLM_F_REQUEST, fd);
+ } else {
+ uid = lookupUidByFamily(protocol, local, remote, family, NLM_F_REQUEST, fd);
+ }
+ if (uid != INVALID_UID) {
+ return uid;
+ }
+ }
+
+ /**
+ * For UDP it's possible for a socket to send packets to arbitrary destinations, even if the
+ * socket is not connected (and even if the socket is connected to a different destination).
+ * If we want this API to work for such packets, then on miss we need to do a second lookup
+ * with only the local address and port filled in.
+ * Always use flags == NLM_F_REQUEST | NLM_F_DUMP for wildcard.
+ */
+ if (protocol == IPPROTO_UDP) {
+ try {
+ InetSocketAddress wildcard = new InetSocketAddress(
+ Inet6Address.getByName("::"), 0);
+ uid = lookupUidByFamily(protocol, local, wildcard, AF_INET6,
+ (short) (NLM_F_REQUEST | NLM_F_DUMP), fd);
+ if (uid != INVALID_UID) {
+ return uid;
+ }
+ wildcard = new InetSocketAddress(Inet4Address.getByName("0.0.0.0"), 0);
+ uid = lookupUidByFamily(protocol, local, wildcard, AF_INET,
+ (short) (NLM_F_REQUEST | NLM_F_DUMP), fd);
+ if (uid != INVALID_UID) {
+ return uid;
+ }
+ } catch (UnknownHostException e) {
+ Log.e(TAG, e.toString());
+ }
+ }
+ return INVALID_UID;
+ }
+
+ /**
+ * Use an inet_diag socket to look up the UID associated with the input local and remote
+ * address/port and protocol of a connection.
+ */
+ public static int getConnectionOwnerUid(int protocol, InetSocketAddress local,
+ InetSocketAddress remote) {
+ int uid = INVALID_UID;
+ FileDescriptor fd = null;
+ try {
+ fd = NetlinkSocket.forProto(NETLINK_INET_DIAG);
+ NetlinkSocket.connectToKernel(fd);
+ uid = lookupUid(protocol, local, remote, fd);
+ } catch (ErrnoException | SocketException | IllegalArgumentException
+ | InterruptedIOException e) {
+ Log.e(TAG, e.toString());
+ } finally {
+ if (fd != null) {
+ try {
+ SocketUtils.closeSocket(fd);
+ } catch (IOException e) {
+ Log.e(TAG, e.toString());
+ }
+ }
+ }
+ return uid;
+ }
+
+ @Override
+ public String toString() {
+ return "InetDiagMessage{ "
+ + "nlmsghdr{" + (mHeader == null ? "" : mHeader.toString()) + "}, "
+ + "inet_diag_msg{"
+ + (mStructInetDiagMsg == null ? "" : mStructInetDiagMsg.toString()) + "} "
+ + "}";
+ }
+}
diff --git a/common/netlinkclient/src/android/net/netlink/NetlinkConstants.java b/common/netlinkclient/src/android/net/netlink/NetlinkConstants.java
new file mode 100644
index 0000000..fc1551c
--- /dev/null
+++ b/common/netlinkclient/src/android/net/netlink/NetlinkConstants.java
@@ -0,0 +1,129 @@
+/*
+ * Copyright (C) 2015 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 android.net.netlink;
+
+import android.system.OsConstants;
+import com.android.internal.util.HexDump;
+
+import java.nio.ByteBuffer;
+
+
+/**
+ * Various constants and static helper methods for netlink communications.
+ *
+ * Values taken from:
+ *
+ * <linux_src>/include/uapi/linux/netlink.h
+ * <linux_src>/include/uapi/linux/rtnetlink.h
+ *
+ * @hide
+ */
+public class NetlinkConstants {
+ private NetlinkConstants() {}
+
+ public static final int NLA_ALIGNTO = 4;
+
+ public static final int alignedLengthOf(short length) {
+ final int intLength = (int) length & 0xffff;
+ return alignedLengthOf(intLength);
+ }
+
+ public static final int alignedLengthOf(int length) {
+ if (length <= 0) { return 0; }
+ return (((length + NLA_ALIGNTO - 1) / NLA_ALIGNTO) * NLA_ALIGNTO);
+ }
+
+ public static String stringForAddressFamily(int family) {
+ if (family == OsConstants.AF_INET) { return "AF_INET"; }
+ if (family == OsConstants.AF_INET6) { return "AF_INET6"; }
+ if (family == OsConstants.AF_NETLINK) { return "AF_NETLINK"; }
+ return String.valueOf(family);
+ }
+
+ public static String stringForProtocol(int protocol) {
+ if (protocol == OsConstants.IPPROTO_TCP) { return "IPPROTO_TCP"; }
+ if (protocol == OsConstants.IPPROTO_UDP) { return "IPPROTO_UDP"; }
+ return String.valueOf(protocol);
+ }
+
+ public static String hexify(byte[] bytes) {
+ if (bytes == null) { return "(null)"; }
+ return HexDump.toHexString(bytes);
+ }
+
+ public static String hexify(ByteBuffer buffer) {
+ if (buffer == null) { return "(null)"; }
+ return HexDump.toHexString(
+ buffer.array(), buffer.position(), buffer.remaining());
+ }
+
+ // Known values for struct nlmsghdr nlm_type.
+ public static final short NLMSG_NOOP = 1; // Nothing
+ public static final short NLMSG_ERROR = 2; // Error
+ public static final short NLMSG_DONE = 3; // End of a dump
+ public static final short NLMSG_OVERRUN = 4; // Data lost
+ public static final short NLMSG_MAX_RESERVED = 15; // Max reserved value
+
+ public static final short RTM_NEWLINK = 16;
+ public static final short RTM_DELLINK = 17;
+ public static final short RTM_GETLINK = 18;
+ public static final short RTM_SETLINK = 19;
+ public static final short RTM_NEWADDR = 20;
+ public static final short RTM_DELADDR = 21;
+ public static final short RTM_GETADDR = 22;
+ public static final short RTM_NEWROUTE = 24;
+ public static final short RTM_DELROUTE = 25;
+ public static final short RTM_GETROUTE = 26;
+ public static final short RTM_NEWNEIGH = 28;
+ public static final short RTM_DELNEIGH = 29;
+ public static final short RTM_GETNEIGH = 30;
+ public static final short RTM_NEWRULE = 32;
+ public static final short RTM_DELRULE = 33;
+ public static final short RTM_GETRULE = 34;
+ public static final short RTM_NEWNDUSEROPT = 68;
+
+ /* see <linux_src>/include/uapi/linux/sock_diag.h */
+ public static final short SOCK_DIAG_BY_FAMILY = 20;
+
+ public static String stringForNlMsgType(short nlm_type) {
+ switch (nlm_type) {
+ case NLMSG_NOOP: return "NLMSG_NOOP";
+ case NLMSG_ERROR: return "NLMSG_ERROR";
+ case NLMSG_DONE: return "NLMSG_DONE";
+ case NLMSG_OVERRUN: return "NLMSG_OVERRUN";
+ case RTM_NEWLINK: return "RTM_NEWLINK";
+ case RTM_DELLINK: return "RTM_DELLINK";
+ case RTM_GETLINK: return "RTM_GETLINK";
+ case RTM_SETLINK: return "RTM_SETLINK";
+ case RTM_NEWADDR: return "RTM_NEWADDR";
+ case RTM_DELADDR: return "RTM_DELADDR";
+ case RTM_GETADDR: return "RTM_GETADDR";
+ case RTM_NEWROUTE: return "RTM_NEWROUTE";
+ case RTM_DELROUTE: return "RTM_DELROUTE";
+ case RTM_GETROUTE: return "RTM_GETROUTE";
+ case RTM_NEWNEIGH: return "RTM_NEWNEIGH";
+ case RTM_DELNEIGH: return "RTM_DELNEIGH";
+ case RTM_GETNEIGH: return "RTM_GETNEIGH";
+ case RTM_NEWRULE: return "RTM_NEWRULE";
+ case RTM_DELRULE: return "RTM_DELRULE";
+ case RTM_GETRULE: return "RTM_GETRULE";
+ case RTM_NEWNDUSEROPT: return "RTM_NEWNDUSEROPT";
+ default:
+ return "unknown RTM type: " + String.valueOf(nlm_type);
+ }
+ }
+}
diff --git a/common/netlinkclient/src/android/net/netlink/NetlinkErrorMessage.java b/common/netlinkclient/src/android/net/netlink/NetlinkErrorMessage.java
new file mode 100644
index 0000000..36b02c6
--- /dev/null
+++ b/common/netlinkclient/src/android/net/netlink/NetlinkErrorMessage.java
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2019 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 android.net.netlink;
+
+import java.nio.ByteBuffer;
+
+
+/**
+ * A NetlinkMessage subclass for netlink error messages.
+ *
+ * @hide
+ */
+public class NetlinkErrorMessage extends NetlinkMessage {
+
+ public static NetlinkErrorMessage parse(StructNlMsgHdr header, ByteBuffer byteBuffer) {
+ final NetlinkErrorMessage errorMsg = new NetlinkErrorMessage(header);
+
+ errorMsg.mNlMsgErr = StructNlMsgErr.parse(byteBuffer);
+ if (errorMsg.mNlMsgErr == null) {
+ return null;
+ }
+
+ return errorMsg;
+ }
+
+ private StructNlMsgErr mNlMsgErr;
+
+ NetlinkErrorMessage(StructNlMsgHdr header) {
+ super(header);
+ mNlMsgErr = null;
+ }
+
+ public StructNlMsgErr getNlMsgError() {
+ return mNlMsgErr;
+ }
+
+ @Override
+ public String toString() {
+ return "NetlinkErrorMessage{ "
+ + "nlmsghdr{" + (mHeader == null ? "" : mHeader.toString()) + "}, "
+ + "nlmsgerr{" + (mNlMsgErr == null ? "" : mNlMsgErr.toString()) + "} "
+ + "}";
+ }
+}
diff --git a/common/netlinkclient/src/android/net/netlink/NetlinkMessage.java b/common/netlinkclient/src/android/net/netlink/NetlinkMessage.java
new file mode 100644
index 0000000..b730032
--- /dev/null
+++ b/common/netlinkclient/src/android/net/netlink/NetlinkMessage.java
@@ -0,0 +1,92 @@
+/*
+ * Copyright (C) 2019 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 android.net.netlink;
+
+import java.nio.ByteBuffer;
+
+
+/**
+ * NetlinkMessage base class for other, more specific netlink message types.
+ *
+ * Classes that extend NetlinkMessage should:
+ * - implement a public static parse(StructNlMsgHdr, ByteBuffer) method
+ * - returning either null (parse errors) or a new object of the subclass
+ * type (cast-able to NetlinkMessage)
+ *
+ * NetlinkMessage.parse() should be updated to know which nlmsg_type values
+ * correspond with which message subclasses.
+ *
+ * @hide
+ */
+public class NetlinkMessage {
+ private final static String TAG = "NetlinkMessage";
+
+ public static NetlinkMessage parse(ByteBuffer byteBuffer) {
+ final int startPosition = (byteBuffer != null) ? byteBuffer.position() : -1;
+ final StructNlMsgHdr nlmsghdr = StructNlMsgHdr.parse(byteBuffer);
+ if (nlmsghdr == null) {
+ return null;
+ }
+
+ int payloadLength = NetlinkConstants.alignedLengthOf(nlmsghdr.nlmsg_len);
+ payloadLength -= StructNlMsgHdr.STRUCT_SIZE;
+ if (payloadLength < 0 || payloadLength > byteBuffer.remaining()) {
+ // Malformed message or runt buffer. Pretend the buffer was consumed.
+ byteBuffer.position(byteBuffer.limit());
+ return null;
+ }
+
+ switch (nlmsghdr.nlmsg_type) {
+ //case NetlinkConstants.NLMSG_NOOP:
+ case NetlinkConstants.NLMSG_ERROR:
+ return (NetlinkMessage) NetlinkErrorMessage.parse(nlmsghdr, byteBuffer);
+ case NetlinkConstants.NLMSG_DONE:
+ byteBuffer.position(byteBuffer.position() + payloadLength);
+ return new NetlinkMessage(nlmsghdr);
+ //case NetlinkConstants.NLMSG_OVERRUN:
+ case NetlinkConstants.RTM_NEWNEIGH:
+ case NetlinkConstants.RTM_DELNEIGH:
+ case NetlinkConstants.RTM_GETNEIGH:
+ return (NetlinkMessage) RtNetlinkNeighborMessage.parse(nlmsghdr, byteBuffer);
+ case NetlinkConstants.SOCK_DIAG_BY_FAMILY:
+ return (NetlinkMessage) InetDiagMessage.parse(nlmsghdr, byteBuffer);
+ default:
+ if (nlmsghdr.nlmsg_type <= NetlinkConstants.NLMSG_MAX_RESERVED) {
+ // Netlink control message. Just parse the header for now,
+ // pretending the whole message was consumed.
+ byteBuffer.position(byteBuffer.position() + payloadLength);
+ return new NetlinkMessage(nlmsghdr);
+ }
+ return null;
+ }
+ }
+
+ protected StructNlMsgHdr mHeader;
+
+ public NetlinkMessage(StructNlMsgHdr nlmsghdr) {
+ mHeader = nlmsghdr;
+ }
+
+ public StructNlMsgHdr getHeader() {
+ return mHeader;
+ }
+
+ @Override
+ public String toString() {
+ return "NetlinkMessage{" + (mHeader == null ? "" : mHeader.toString()) + "}";
+ }
+}
diff --git a/common/netlinkclient/src/android/net/netlink/NetlinkSocket.java b/common/netlinkclient/src/android/net/netlink/NetlinkSocket.java
new file mode 100644
index 0000000..7311fc5
--- /dev/null
+++ b/common/netlinkclient/src/android/net/netlink/NetlinkSocket.java
@@ -0,0 +1,158 @@
+/*
+ * Copyright (C) 2015 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 android.net.netlink;
+
+import static android.net.util.SocketUtils.makeNetlinkSocketAddress;
+import static android.system.OsConstants.AF_NETLINK;
+import static android.system.OsConstants.EIO;
+import static android.system.OsConstants.EPROTO;
+import static android.system.OsConstants.ETIMEDOUT;
+import static android.system.OsConstants.SOCK_DGRAM;
+import static android.system.OsConstants.SOL_SOCKET;
+import static android.system.OsConstants.SO_RCVBUF;
+import static android.system.OsConstants.SO_RCVTIMEO;
+import static android.system.OsConstants.SO_SNDTIMEO;
+
+import android.net.util.SocketUtils;
+import android.system.ErrnoException;
+import android.system.Os;
+import android.system.StructTimeval;
+import android.util.Log;
+
+import java.io.FileDescriptor;
+import java.io.IOException;
+import java.io.InterruptedIOException;
+import java.net.SocketException;
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+
+
+/**
+ * NetlinkSocket
+ *
+ * A small static class to assist with AF_NETLINK socket operations.
+ *
+ * @hide
+ */
+public class NetlinkSocket {
+ private static final String TAG = "NetlinkSocket";
+
+ public static final int DEFAULT_RECV_BUFSIZE = 8 * 1024;
+ public static final int SOCKET_RECV_BUFSIZE = 64 * 1024;
+
+ public static void sendOneShotKernelMessage(int nlProto, byte[] msg) throws ErrnoException {
+ final String errPrefix = "Error in NetlinkSocket.sendOneShotKernelMessage";
+ final long IO_TIMEOUT = 300L;
+
+ final FileDescriptor fd = forProto(nlProto);
+
+ try {
+ connectToKernel(fd);
+ sendMessage(fd, msg, 0, msg.length, IO_TIMEOUT);
+ final ByteBuffer bytes = recvMessage(fd, DEFAULT_RECV_BUFSIZE, IO_TIMEOUT);
+ // recvMessage() guaranteed to not return null if it did not throw.
+ final NetlinkMessage response = NetlinkMessage.parse(bytes);
+ if (response != null && response instanceof NetlinkErrorMessage &&
+ (((NetlinkErrorMessage) response).getNlMsgError() != null)) {
+ final int errno = ((NetlinkErrorMessage) response).getNlMsgError().error;
+ if (errno != 0) {
+ // TODO: consider ignoring EINVAL (-22), which appears to be
+ // normal when probing a neighbor for which the kernel does
+ // not already have / no longer has a link layer address.
+ Log.e(TAG, errPrefix + ", errmsg=" + response.toString());
+ // Note: convert kernel errnos (negative) into userspace errnos (positive).
+ throw new ErrnoException(response.toString(), Math.abs(errno));
+ }
+ } else {
+ final String errmsg;
+ if (response == null) {
+ bytes.position(0);
+ errmsg = "raw bytes: " + NetlinkConstants.hexify(bytes);
+ } else {
+ errmsg = response.toString();
+ }
+ Log.e(TAG, errPrefix + ", errmsg=" + errmsg);
+ throw new ErrnoException(errmsg, EPROTO);
+ }
+ } catch (InterruptedIOException e) {
+ Log.e(TAG, errPrefix, e);
+ throw new ErrnoException(errPrefix, ETIMEDOUT, e);
+ } catch (SocketException e) {
+ Log.e(TAG, errPrefix, e);
+ throw new ErrnoException(errPrefix, EIO, e);
+ } finally {
+ try {
+ SocketUtils.closeSocket(fd);
+ } catch (IOException e) {
+ // Nothing we can do here
+ }
+ }
+ }
+
+ public static FileDescriptor forProto(int nlProto) throws ErrnoException {
+ final FileDescriptor fd = Os.socket(AF_NETLINK, SOCK_DGRAM, nlProto);
+ Os.setsockoptInt(fd, SOL_SOCKET, SO_RCVBUF, SOCKET_RECV_BUFSIZE);
+ return fd;
+ }
+
+ public static void connectToKernel(FileDescriptor fd) throws ErrnoException, SocketException {
+ Os.connect(fd, makeNetlinkSocketAddress(0, 0));
+ }
+
+ private static void checkTimeout(long timeoutMs) {
+ if (timeoutMs < 0) {
+ throw new IllegalArgumentException("Negative timeouts not permitted");
+ }
+ }
+
+ /**
+ * Wait up to |timeoutMs| (or until underlying socket error) for a
+ * netlink message of at most |bufsize| size.
+ *
+ * Multi-threaded calls with different timeouts will cause unexpected results.
+ */
+ public static ByteBuffer recvMessage(FileDescriptor fd, int bufsize, long timeoutMs)
+ throws ErrnoException, IllegalArgumentException, InterruptedIOException {
+ checkTimeout(timeoutMs);
+
+ Os.setsockoptTimeval(fd, SOL_SOCKET, SO_RCVTIMEO, StructTimeval.fromMillis(timeoutMs));
+
+ ByteBuffer byteBuffer = ByteBuffer.allocate(bufsize);
+ int length = Os.read(fd, byteBuffer);
+ if (length == bufsize) {
+ Log.w(TAG, "maximum read");
+ }
+ byteBuffer.position(0);
+ byteBuffer.limit(length);
+ byteBuffer.order(ByteOrder.nativeOrder());
+ return byteBuffer;
+ }
+
+ /**
+ * Send a message to a peer to which this socket has previously connected,
+ * waiting at most |timeoutMs| milliseconds for the send to complete.
+ *
+ * Multi-threaded calls with different timeouts will cause unexpected results.
+ */
+ public static int sendMessage(
+ FileDescriptor fd, byte[] bytes, int offset, int count, long timeoutMs)
+ throws ErrnoException, IllegalArgumentException, InterruptedIOException {
+ checkTimeout(timeoutMs);
+ Os.setsockoptTimeval(fd, SOL_SOCKET, SO_SNDTIMEO, StructTimeval.fromMillis(timeoutMs));
+ return Os.write(fd, bytes, offset, count);
+ }
+}
diff --git a/common/netlinkclient/src/android/net/netlink/RtNetlinkNeighborMessage.java b/common/netlinkclient/src/android/net/netlink/RtNetlinkNeighborMessage.java
new file mode 100644
index 0000000..8b9e7e0
--- /dev/null
+++ b/common/netlinkclient/src/android/net/netlink/RtNetlinkNeighborMessage.java
@@ -0,0 +1,245 @@
+/*
+ * Copyright (C) 2019 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 android.net.netlink;
+
+import static android.net.netlink.StructNlMsgHdr.NLM_F_ACK;
+import static android.net.netlink.StructNlMsgHdr.NLM_F_DUMP;
+import static android.net.netlink.StructNlMsgHdr.NLM_F_REPLACE;
+import static android.net.netlink.StructNlMsgHdr.NLM_F_REQUEST;
+
+import android.system.OsConstants;
+
+import java.net.InetAddress;
+import java.net.Inet6Address;
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+
+
+/**
+ * A NetlinkMessage subclass for rtnetlink neighbor messages.
+ *
+ * see also: <linux_src>/include/uapi/linux/neighbour.h
+ *
+ * @hide
+ */
+public class RtNetlinkNeighborMessage extends NetlinkMessage {
+ public static final short NDA_UNSPEC = 0;
+ public static final short NDA_DST = 1;
+ public static final short NDA_LLADDR = 2;
+ public static final short NDA_CACHEINFO = 3;
+ public static final short NDA_PROBES = 4;
+ public static final short NDA_VLAN = 5;
+ public static final short NDA_PORT = 6;
+ public static final short NDA_VNI = 7;
+ public static final short NDA_IFINDEX = 8;
+ public static final short NDA_MASTER = 9;
+
+ private static StructNlAttr findNextAttrOfType(short attrType, ByteBuffer byteBuffer) {
+ while (byteBuffer != null && byteBuffer.remaining() > 0) {
+ final StructNlAttr nlAttr = StructNlAttr.peek(byteBuffer);
+ if (nlAttr == null) {
+ break;
+ }
+ if (nlAttr.nla_type == attrType) {
+ return StructNlAttr.parse(byteBuffer);
+ }
+ if (byteBuffer.remaining() < nlAttr.getAlignedLength()) {
+ break;
+ }
+ byteBuffer.position(byteBuffer.position() + nlAttr.getAlignedLength());
+ }
+ return null;
+ }
+
+ public static RtNetlinkNeighborMessage parse(StructNlMsgHdr header, ByteBuffer byteBuffer) {
+ final RtNetlinkNeighborMessage neighMsg = new RtNetlinkNeighborMessage(header);
+
+ neighMsg.mNdmsg = StructNdMsg.parse(byteBuffer);
+ if (neighMsg.mNdmsg == null) {
+ return null;
+ }
+
+ // Some of these are message-type dependent, and not always present.
+ final int baseOffset = byteBuffer.position();
+ StructNlAttr nlAttr = findNextAttrOfType(NDA_DST, byteBuffer);
+ if (nlAttr != null) {
+ neighMsg.mDestination = nlAttr.getValueAsInetAddress();
+ }
+
+ byteBuffer.position(baseOffset);
+ nlAttr = findNextAttrOfType(NDA_LLADDR, byteBuffer);
+ if (nlAttr != null) {
+ neighMsg.mLinkLayerAddr = nlAttr.nla_value;
+ }
+
+ byteBuffer.position(baseOffset);
+ nlAttr = findNextAttrOfType(NDA_PROBES, byteBuffer);
+ if (nlAttr != null) {
+ neighMsg.mNumProbes = nlAttr.getValueAsInt(0);
+ }
+
+ byteBuffer.position(baseOffset);
+ nlAttr = findNextAttrOfType(NDA_CACHEINFO, byteBuffer);
+ if (nlAttr != null) {
+ neighMsg.mCacheInfo = StructNdaCacheInfo.parse(nlAttr.getValueAsByteBuffer());
+ }
+
+ final int kMinConsumed = StructNlMsgHdr.STRUCT_SIZE + StructNdMsg.STRUCT_SIZE;
+ final int kAdditionalSpace = NetlinkConstants.alignedLengthOf(
+ neighMsg.mHeader.nlmsg_len - kMinConsumed);
+ if (byteBuffer.remaining() < kAdditionalSpace) {
+ byteBuffer.position(byteBuffer.limit());
+ } else {
+ byteBuffer.position(baseOffset + kAdditionalSpace);
+ }
+
+ return neighMsg;
+ }
+
+ /**
+ * A convenience method to create an RTM_GETNEIGH request message.
+ */
+ public static byte[] newGetNeighborsRequest(int seqNo) {
+ final int length = StructNlMsgHdr.STRUCT_SIZE + StructNdMsg.STRUCT_SIZE;
+ final byte[] bytes = new byte[length];
+ final ByteBuffer byteBuffer = ByteBuffer.wrap(bytes);
+ byteBuffer.order(ByteOrder.nativeOrder());
+
+ final StructNlMsgHdr nlmsghdr = new StructNlMsgHdr();
+ nlmsghdr.nlmsg_len = length;
+ nlmsghdr.nlmsg_type = NetlinkConstants.RTM_GETNEIGH;
+ nlmsghdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP;
+ nlmsghdr.nlmsg_seq = seqNo;
+ nlmsghdr.pack(byteBuffer);
+
+ final StructNdMsg ndmsg = new StructNdMsg();
+ ndmsg.pack(byteBuffer);
+
+ return bytes;
+ }
+
+ /**
+ * A convenience method to create an RTM_NEWNEIGH message, to modify
+ * the kernel's state information for a specific neighbor.
+ */
+ public static byte[] newNewNeighborMessage(
+ int seqNo, InetAddress ip, short nudState, int ifIndex, byte[] llAddr) {
+ final StructNlMsgHdr nlmsghdr = new StructNlMsgHdr();
+ nlmsghdr.nlmsg_type = NetlinkConstants.RTM_NEWNEIGH;
+ nlmsghdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | NLM_F_REPLACE;
+ nlmsghdr.nlmsg_seq = seqNo;
+
+ final RtNetlinkNeighborMessage msg = new RtNetlinkNeighborMessage(nlmsghdr);
+ msg.mNdmsg = new StructNdMsg();
+ msg.mNdmsg.ndm_family =
+ (byte) ((ip instanceof Inet6Address) ? OsConstants.AF_INET6 : OsConstants.AF_INET);
+ msg.mNdmsg.ndm_ifindex = ifIndex;
+ msg.mNdmsg.ndm_state = nudState;
+ msg.mDestination = ip;
+ msg.mLinkLayerAddr = llAddr; // might be null
+
+ final byte[] bytes = new byte[msg.getRequiredSpace()];
+ nlmsghdr.nlmsg_len = bytes.length;
+ final ByteBuffer byteBuffer = ByteBuffer.wrap(bytes);
+ byteBuffer.order(ByteOrder.nativeOrder());
+ msg.pack(byteBuffer);
+ return bytes;
+ }
+
+ private StructNdMsg mNdmsg;
+ private InetAddress mDestination;
+ private byte[] mLinkLayerAddr;
+ private int mNumProbes;
+ private StructNdaCacheInfo mCacheInfo;
+
+ private RtNetlinkNeighborMessage(StructNlMsgHdr header) {
+ super(header);
+ mNdmsg = null;
+ mDestination = null;
+ mLinkLayerAddr = null;
+ mNumProbes = 0;
+ mCacheInfo = null;
+ }
+
+ public StructNdMsg getNdHeader() {
+ return mNdmsg;
+ }
+
+ public InetAddress getDestination() {
+ return mDestination;
+ }
+
+ public byte[] getLinkLayerAddress() {
+ return mLinkLayerAddr;
+ }
+
+ public int getProbes() {
+ return mNumProbes;
+ }
+
+ public StructNdaCacheInfo getCacheInfo() {
+ return mCacheInfo;
+ }
+
+ public int getRequiredSpace() {
+ int spaceRequired = StructNlMsgHdr.STRUCT_SIZE + StructNdMsg.STRUCT_SIZE;
+ if (mDestination != null) {
+ spaceRequired += NetlinkConstants.alignedLengthOf(
+ StructNlAttr.NLA_HEADERLEN + mDestination.getAddress().length);
+ }
+ if (mLinkLayerAddr != null) {
+ spaceRequired += NetlinkConstants.alignedLengthOf(
+ StructNlAttr.NLA_HEADERLEN + mLinkLayerAddr.length);
+ }
+ // Currently we don't write messages with NDA_PROBES nor NDA_CACHEINFO
+ // attributes appended. Fix later, if necessary.
+ return spaceRequired;
+ }
+
+ private static void packNlAttr(short nlType, byte[] nlValue, ByteBuffer byteBuffer) {
+ final StructNlAttr nlAttr = new StructNlAttr();
+ nlAttr.nla_type = nlType;
+ nlAttr.nla_value = nlValue;
+ nlAttr.nla_len = (short) (StructNlAttr.NLA_HEADERLEN + nlAttr.nla_value.length);
+ nlAttr.pack(byteBuffer);
+ }
+
+ public void pack(ByteBuffer byteBuffer) {
+ getHeader().pack(byteBuffer) ;
+ mNdmsg.pack(byteBuffer);
+
+ if (mDestination != null) {
+ packNlAttr(NDA_DST, mDestination.getAddress(), byteBuffer);
+ }
+ if (mLinkLayerAddr != null) {
+ packNlAttr(NDA_LLADDR, mLinkLayerAddr, byteBuffer);
+ }
+ }
+
+ @Override
+ public String toString() {
+ final String ipLiteral = (mDestination == null) ? "" : mDestination.getHostAddress();
+ return "RtNetlinkNeighborMessage{ "
+ + "nlmsghdr{" + (mHeader == null ? "" : mHeader.toString()) + "}, "
+ + "ndmsg{" + (mNdmsg == null ? "" : mNdmsg.toString()) + "}, "
+ + "destination{" + ipLiteral + "} "
+ + "linklayeraddr{" + NetlinkConstants.hexify(mLinkLayerAddr) + "} "
+ + "probes{" + mNumProbes + "} "
+ + "cacheinfo{" + (mCacheInfo == null ? "" : mCacheInfo.toString()) + "} "
+ + "}";
+ }
+}
diff --git a/common/netlinkclient/src/android/net/netlink/StructInetDiagMsg.java b/common/netlinkclient/src/android/net/netlink/StructInetDiagMsg.java
new file mode 100644
index 0000000..5772a94
--- /dev/null
+++ b/common/netlinkclient/src/android/net/netlink/StructInetDiagMsg.java
@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2019 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 android.net.netlink;
+
+import java.nio.ByteBuffer;
+
+/**
+ * struct inet_diag_msg
+ *
+ * see <linux_src>/include/uapi/linux/inet_diag.h
+ *
+ * struct inet_diag_msg {
+ * __u8 idiag_family;
+ * __u8 idiag_state;
+ * __u8 idiag_timer;
+ * __u8 idiag_retrans;
+ * struct inet_diag_sockid id;
+ * __u32 idiag_expires;
+ * __u32 idiag_rqueue;
+ * __u32 idiag_wqueue;
+ * __u32 idiag_uid;
+ * __u32 idiag_inode;
+ * };
+ *
+ * @hide
+ */
+public class StructInetDiagMsg {
+ public static final int STRUCT_SIZE = 4 + StructInetDiagSockId.STRUCT_SIZE + 20;
+ private static final int IDIAG_UID_OFFSET = StructNlMsgHdr.STRUCT_SIZE + 4 +
+ StructInetDiagSockId.STRUCT_SIZE + 12;
+ public int idiag_uid;
+
+ public static StructInetDiagMsg parse(ByteBuffer byteBuffer) {
+ StructInetDiagMsg struct = new StructInetDiagMsg();
+ struct.idiag_uid = byteBuffer.getInt(IDIAG_UID_OFFSET);
+ return struct;
+ }
+
+ @Override
+ public String toString() {
+ return "StructInetDiagMsg{ "
+ + "idiag_uid{" + idiag_uid + "}, "
+ + "}";
+ }
+}
diff --git a/common/netlinkclient/src/android/net/netlink/StructInetDiagReqV2.java b/common/netlinkclient/src/android/net/netlink/StructInetDiagReqV2.java
new file mode 100644
index 0000000..520f0ef
--- /dev/null
+++ b/common/netlinkclient/src/android/net/netlink/StructInetDiagReqV2.java
@@ -0,0 +1,97 @@
+/*
+ * Copyright (C) 2019 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 android.net.netlink;
+
+import android.annotation.Nullable;
+
+import java.net.InetSocketAddress;
+import java.nio.ByteBuffer;
+
+/**
+ * struct inet_diag_req_v2
+ *
+ * see <linux_src>/include/uapi/linux/inet_diag.h
+ *
+ * struct inet_diag_req_v2 {
+ * __u8 sdiag_family;
+ * __u8 sdiag_protocol;
+ * __u8 idiag_ext;
+ * __u8 pad;
+ * __u32 idiag_states;
+ * struct inet_diag_sockid id;
+ * };
+ *
+ * @hide
+ */
+public class StructInetDiagReqV2 {
+ public static final int STRUCT_SIZE = 8 + StructInetDiagSockId.STRUCT_SIZE;
+
+ private final byte mSdiagFamily;
+ private final byte mSdiagProtocol;
+ private final byte mIdiagExt;
+ private final byte mPad;
+ private final StructInetDiagSockId mId;
+ private final int mState;
+ public static final int INET_DIAG_REQ_V2_ALL_STATES = (int) 0xffffffff;
+
+ public StructInetDiagReqV2(int protocol, InetSocketAddress local, InetSocketAddress remote,
+ int family) {
+ this(protocol, local, remote, family, 0 /* pad */, 0 /* extension */,
+ INET_DIAG_REQ_V2_ALL_STATES);
+ }
+
+ public StructInetDiagReqV2(int protocol, @Nullable InetSocketAddress local,
+ @Nullable InetSocketAddress remote, int family, int pad, int extension, int state)
+ throws NullPointerException {
+ mSdiagFamily = (byte) family;
+ mSdiagProtocol = (byte) protocol;
+ // Request for all sockets if no specific socket is requested. Specify the local and remote
+ // socket address information for target request socket.
+ if ((local == null) != (remote == null)) {
+ throw new NullPointerException("Local and remote must be both null or both non-null");
+ }
+ mId = ((local != null && remote != null) ? new StructInetDiagSockId(local, remote) : null);
+ mPad = (byte) pad;
+ mIdiagExt = (byte) extension;
+ mState = state;
+ }
+
+ public void pack(ByteBuffer byteBuffer) {
+ // The ByteOrder must have already been set by the caller.
+ byteBuffer.put((byte) mSdiagFamily);
+ byteBuffer.put((byte) mSdiagProtocol);
+ byteBuffer.put((byte) mIdiagExt);
+ byteBuffer.put((byte) mPad);
+ byteBuffer.putInt(mState);
+ if (mId != null) mId.pack(byteBuffer);
+ }
+
+ @Override
+ public String toString() {
+ final String familyStr = NetlinkConstants.stringForAddressFamily(mSdiagFamily);
+ final String protocolStr = NetlinkConstants.stringForAddressFamily(mSdiagProtocol);
+
+ return "StructInetDiagReqV2{ "
+ + "sdiag_family{" + familyStr + "}, "
+ + "sdiag_protocol{" + protocolStr + "}, "
+ + "idiag_ext{" + mIdiagExt + ")}, "
+ + "pad{" + mPad + "}, "
+ + "idiag_states{" + Integer.toHexString(mState) + "}, "
+ + ((mId != null) ? mId.toString() : "inet_diag_sockid=null")
+ + "}";
+ }
+}
diff --git a/common/netlinkclient/src/android/net/netlink/StructInetDiagSockId.java b/common/netlinkclient/src/android/net/netlink/StructInetDiagSockId.java
new file mode 100644
index 0000000..2e9fa25
--- /dev/null
+++ b/common/netlinkclient/src/android/net/netlink/StructInetDiagSockId.java
@@ -0,0 +1,86 @@
+/*
+ * Copyright (C) 2018 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 android.net.netlink;
+
+import static java.nio.ByteOrder.BIG_ENDIAN;
+
+import java.net.Inet4Address;
+import java.net.InetSocketAddress;
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+
+/**
+ * struct inet_diag_req_v2
+ *
+ * see <linux_src>/include/uapi/linux/inet_diag.h
+ *
+ * struct inet_diag_sockid {
+ * __be16 idiag_sport;
+ * __be16 idiag_dport;
+ * __be32 idiag_src[4];
+ * __be32 idiag_dst[4];
+ * __u32 idiag_if;
+ * __u32 idiag_cookie[2];
+ * #define INET_DIAG_NOCOOKIE (~0U)
+ * };
+ *
+ * @hide
+ */
+public class StructInetDiagSockId {
+ public static final int STRUCT_SIZE = 48;
+
+ private final InetSocketAddress mLocSocketAddress;
+ private final InetSocketAddress mRemSocketAddress;
+ private final byte[] INET_DIAG_NOCOOKIE = new byte[]{
+ (byte) 0xff, (byte) 0xff, (byte) 0xff, (byte) 0xff,
+ (byte) 0xff, (byte) 0xff, (byte) 0xff, (byte) 0xff};
+ private final byte[] IPV4_PADDING = new byte[] {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
+
+ public StructInetDiagSockId(InetSocketAddress loc, InetSocketAddress rem) {
+ mLocSocketAddress = loc;
+ mRemSocketAddress = rem;
+ }
+
+ public void pack(ByteBuffer byteBuffer) {
+ byteBuffer.order(BIG_ENDIAN);
+ byteBuffer.putShort((short) mLocSocketAddress.getPort());
+ byteBuffer.putShort((short) mRemSocketAddress.getPort());
+ byteBuffer.put(mLocSocketAddress.getAddress().getAddress());
+ if (mLocSocketAddress.getAddress() instanceof Inet4Address) {
+ byteBuffer.put(IPV4_PADDING);
+ }
+ byteBuffer.put(mRemSocketAddress.getAddress().getAddress());
+ if (mRemSocketAddress.getAddress() instanceof Inet4Address) {
+ byteBuffer.put(IPV4_PADDING);
+ }
+ byteBuffer.order(ByteOrder.nativeOrder());
+ byteBuffer.putInt(0);
+ byteBuffer.put(INET_DIAG_NOCOOKIE);
+ }
+
+ @Override
+ public String toString() {
+ return "StructInetDiagSockId{ "
+ + "idiag_sport{" + mLocSocketAddress.getPort() + "}, "
+ + "idiag_dport{" + mRemSocketAddress.getPort() + "}, "
+ + "idiag_src{" + mLocSocketAddress.getAddress().getHostAddress() + "}, "
+ + "idiag_dst{" + mRemSocketAddress.getAddress().getHostAddress() + "}, "
+ + "idiag_if{" + 0 + "} "
+ + "idiag_cookie{INET_DIAG_NOCOOKIE}"
+ + "}";
+ }
+}
diff --git a/common/netlinkclient/src/android/net/netlink/StructNdMsg.java b/common/netlinkclient/src/android/net/netlink/StructNdMsg.java
new file mode 100644
index 0000000..64364df
--- /dev/null
+++ b/common/netlinkclient/src/android/net/netlink/StructNdMsg.java
@@ -0,0 +1,165 @@
+/*
+ * Copyright (C) 2019 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 android.net.netlink;
+
+import android.system.OsConstants;
+import java.nio.ByteBuffer;
+
+
+/**
+ * struct ndmsg
+ *
+ * see: <linux_src>/include/uapi/linux/neighbour.h
+ *
+ * @hide
+ */
+public class StructNdMsg {
+ // Already aligned.
+ public static final int STRUCT_SIZE = 12;
+
+ // Neighbor Cache Entry States
+ public static final short NUD_NONE = 0x00;
+ public static final short NUD_INCOMPLETE = 0x01;
+ public static final short NUD_REACHABLE = 0x02;
+ public static final short NUD_STALE = 0x04;
+ public static final short NUD_DELAY = 0x08;
+ public static final short NUD_PROBE = 0x10;
+ public static final short NUD_FAILED = 0x20;
+ public static final short NUD_NOARP = 0x40;
+ public static final short NUD_PERMANENT = 0x80;
+
+ public static String stringForNudState(short nudState) {
+ switch (nudState) {
+ case NUD_NONE: return "NUD_NONE";
+ case NUD_INCOMPLETE: return "NUD_INCOMPLETE";
+ case NUD_REACHABLE: return "NUD_REACHABLE";
+ case NUD_STALE: return "NUD_STALE";
+ case NUD_DELAY: return "NUD_DELAY";
+ case NUD_PROBE: return "NUD_PROBE";
+ case NUD_FAILED: return "NUD_FAILED";
+ case NUD_NOARP: return "NUD_NOARP";
+ case NUD_PERMANENT: return "NUD_PERMANENT";
+ default:
+ return "unknown NUD state: " + String.valueOf(nudState);
+ }
+ }
+
+ public static boolean isNudStateConnected(short nudState) {
+ return ((nudState & (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE)) != 0);
+ }
+
+ public static boolean isNudStateValid(short nudState) {
+ return (isNudStateConnected(nudState) ||
+ ((nudState & (NUD_PROBE|NUD_STALE|NUD_DELAY)) != 0));
+ }
+
+ // Neighbor Cache Entry Flags
+ public static byte NTF_USE = (byte) 0x01;
+ public static byte NTF_SELF = (byte) 0x02;
+ public static byte NTF_MASTER = (byte) 0x04;
+ public static byte NTF_PROXY = (byte) 0x08;
+ public static byte NTF_ROUTER = (byte) 0x80;
+
+ public static String stringForNudFlags(byte flags) {
+ final StringBuilder sb = new StringBuilder();
+ if ((flags & NTF_USE) != 0) {
+ sb.append("NTF_USE");
+ }
+ if ((flags & NTF_SELF) != 0) {
+ if (sb.length() > 0) { sb.append("|"); }
+ sb.append("NTF_SELF");
+ }
+ if ((flags & NTF_MASTER) != 0) {
+ if (sb.length() > 0) { sb.append("|"); }
+ sb.append("NTF_MASTER");
+ }
+ if ((flags & NTF_PROXY) != 0) {
+ if (sb.length() > 0) { sb.append("|");
+ }
+ sb.append("NTF_PROXY"); }
+ if ((flags & NTF_ROUTER) != 0) {
+ if (sb.length() > 0) { sb.append("|"); }
+ sb.append("NTF_ROUTER");
+ }
+ return sb.toString();
+ }
+
+ private static boolean hasAvailableSpace(ByteBuffer byteBuffer) {
+ return byteBuffer != null && byteBuffer.remaining() >= STRUCT_SIZE;
+ }
+
+ public static StructNdMsg parse(ByteBuffer byteBuffer) {
+ if (!hasAvailableSpace(byteBuffer)) { return null; }
+
+ // The ByteOrder must have already been set by the caller. In most
+ // cases ByteOrder.nativeOrder() is correct, with the possible
+ // exception of usage within unittests.
+ final StructNdMsg struct = new StructNdMsg();
+ struct.ndm_family = byteBuffer.get();
+ final byte pad1 = byteBuffer.get();
+ final short pad2 = byteBuffer.getShort();
+ struct.ndm_ifindex = byteBuffer.getInt();
+ struct.ndm_state = byteBuffer.getShort();
+ struct.ndm_flags = byteBuffer.get();
+ struct.ndm_type = byteBuffer.get();
+ return struct;
+ }
+
+ public byte ndm_family;
+ public int ndm_ifindex;
+ public short ndm_state;
+ public byte ndm_flags;
+ public byte ndm_type;
+
+ public StructNdMsg() {
+ ndm_family = (byte) OsConstants.AF_UNSPEC;
+ }
+
+ public void pack(ByteBuffer byteBuffer) {
+ // The ByteOrder must have already been set by the caller. In most
+ // cases ByteOrder.nativeOrder() is correct, with the exception
+ // of usage within unittests.
+ byteBuffer.put(ndm_family);
+ byteBuffer.put((byte) 0); // pad1
+ byteBuffer.putShort((short) 0); // pad2
+ byteBuffer.putInt(ndm_ifindex);
+ byteBuffer.putShort(ndm_state);
+ byteBuffer.put(ndm_flags);
+ byteBuffer.put(ndm_type);
+ }
+
+ public boolean nudConnected() {
+ return isNudStateConnected(ndm_state);
+ }
+
+ public boolean nudValid() {
+ return isNudStateValid(ndm_state);
+ }
+
+ @Override
+ public String toString() {
+ final String stateStr = "" + ndm_state + " (" + stringForNudState(ndm_state) + ")";
+ final String flagsStr = "" + ndm_flags + " (" + stringForNudFlags(ndm_flags) + ")";
+ return "StructNdMsg{ "
+ + "family{" + NetlinkConstants.stringForAddressFamily((int) ndm_family) + "}, "
+ + "ifindex{" + ndm_ifindex + "}, "
+ + "state{" + stateStr + "}, "
+ + "flags{" + flagsStr + "}, "
+ + "type{" + ndm_type + "} "
+ + "}";
+ }
+}
diff --git a/common/netlinkclient/src/android/net/netlink/StructNdaCacheInfo.java b/common/netlinkclient/src/android/net/netlink/StructNdaCacheInfo.java
new file mode 100644
index 0000000..16cf563
--- /dev/null
+++ b/common/netlinkclient/src/android/net/netlink/StructNdaCacheInfo.java
@@ -0,0 +1,117 @@
+/*
+ * Copyright (C) 2015 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 android.net.netlink;
+
+import android.system.Os;
+import android.system.OsConstants;
+
+import java.nio.ByteBuffer;
+
+
+/**
+ * struct nda_cacheinfo
+ *
+ * see: <linux_src>/include/uapi/linux/neighbour.h
+ *
+ * @hide
+ */
+public class StructNdaCacheInfo {
+ // Already aligned.
+ public static final int STRUCT_SIZE = 16;
+
+ private static boolean hasAvailableSpace(ByteBuffer byteBuffer) {
+ return byteBuffer != null && byteBuffer.remaining() >= STRUCT_SIZE;
+ }
+
+ public static StructNdaCacheInfo parse(ByteBuffer byteBuffer) {
+ if (!hasAvailableSpace(byteBuffer)) { return null; }
+
+ // The ByteOrder must have already been set by the caller. In most
+ // cases ByteOrder.nativeOrder() is correct, with the possible
+ // exception of usage within unittests.
+ final StructNdaCacheInfo struct = new StructNdaCacheInfo();
+ struct.ndm_used = byteBuffer.getInt();
+ struct.ndm_confirmed = byteBuffer.getInt();
+ struct.ndm_updated = byteBuffer.getInt();
+ struct.ndm_refcnt = byteBuffer.getInt();
+ return struct;
+ }
+
+ // TODO: investigate whether this can change during device runtime and
+ // decide what (if anything) should be done about that.
+ private static final long CLOCK_TICKS_PER_SECOND = Os.sysconf(OsConstants._SC_CLK_TCK);
+
+ private static long ticksToMilliSeconds(int intClockTicks) {
+ final long longClockTicks = (long) intClockTicks & 0xffffffff;
+ return (longClockTicks * 1000) / CLOCK_TICKS_PER_SECOND;
+ }
+
+ /**
+ * Explanatory notes, for reference.
+ *
+ * Before being returned to user space, the neighbor entry times are
+ * converted to clock_t's like so:
+ *
+ * ndm_used = jiffies_to_clock_t(now - neigh->used);
+ * ndm_confirmed = jiffies_to_clock_t(now - neigh->confirmed);
+ * ndm_updated = jiffies_to_clock_t(now - neigh->updated);
+ *
+ * meaning that these values are expressed as "clock ticks ago". To
+ * convert these clock ticks to seconds divide by sysconf(_SC_CLK_TCK).
+ * When _SC_CLK_TCK is 100, for example, the ndm_* times are expressed
+ * in centiseconds.
+ *
+ * These values are unsigned, but fortunately being expressed as "some
+ * clock ticks ago", these values are typically very small (and
+ * 2^31 centiseconds = 248 days).
+ *
+ * By observation, it appears that:
+ * ndm_used: the last time ARP/ND took place for this neighbor
+ * ndm_confirmed: the last time ARP/ND succeeded for this neighbor OR
+ * higher layer confirmation (TCP or MSG_CONFIRM)
+ * was received
+ * ndm_updated: the time when the current NUD state was entered
+ */
+ public int ndm_used;
+ public int ndm_confirmed;
+ public int ndm_updated;
+ public int ndm_refcnt;
+
+ public StructNdaCacheInfo() {}
+
+ public long lastUsed() {
+ return ticksToMilliSeconds(ndm_used);
+ }
+
+ public long lastConfirmed() {
+ return ticksToMilliSeconds(ndm_confirmed);
+ }
+
+ public long lastUpdated() {
+ return ticksToMilliSeconds(ndm_updated);
+ }
+
+ @Override
+ public String toString() {
+ return "NdaCacheInfo{ "
+ + "ndm_used{" + lastUsed() + "}, "
+ + "ndm_confirmed{" + lastConfirmed() + "}, "
+ + "ndm_updated{" + lastUpdated() + "}, "
+ + "ndm_refcnt{" + ndm_refcnt + "} "
+ + "}";
+ }
+}
diff --git a/common/netlinkclient/src/android/net/netlink/StructNfGenMsg.java b/common/netlinkclient/src/android/net/netlink/StructNfGenMsg.java
new file mode 100644
index 0000000..8155977
--- /dev/null
+++ b/common/netlinkclient/src/android/net/netlink/StructNfGenMsg.java
@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2017 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 android.net.netlink;
+
+import java.nio.ByteBuffer;
+
+
+/**
+ * struct nfgenmsg
+ *
+ * see <linux_src>/include/uapi/linux/netfilter/nfnetlink.h
+ *
+ * @hide
+ */
+public class StructNfGenMsg {
+ public static final int STRUCT_SIZE = 2 + Short.BYTES;
+
+ public static final int NFNETLINK_V0 = 0;
+
+ final public byte nfgen_family;
+ final public byte version;
+ final public short res_id; // N.B.: this is big endian in the kernel
+
+ public StructNfGenMsg(byte family) {
+ nfgen_family = family;
+ version = (byte) NFNETLINK_V0;
+ res_id = (short) 0;
+ }
+
+ public void pack(ByteBuffer byteBuffer) {
+ byteBuffer.put(nfgen_family);
+ byteBuffer.put(version);
+ byteBuffer.putShort(res_id);
+ }
+}
diff --git a/common/netlinkclient/src/android/net/netlink/StructNlAttr.java b/common/netlinkclient/src/android/net/netlink/StructNlAttr.java
new file mode 100644
index 0000000..747998d
--- /dev/null
+++ b/common/netlinkclient/src/android/net/netlink/StructNlAttr.java
@@ -0,0 +1,208 @@
+/*
+ * Copyright (C) 2019 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 android.net.netlink;
+
+import java.net.InetAddress;
+import java.net.UnknownHostException;
+import java.nio.ByteOrder;
+import java.nio.ByteBuffer;
+
+
+/**
+ * struct nlattr
+ *
+ * see: <linux_src>/include/uapi/linux/netlink.h
+ *
+ * @hide
+ */
+public class StructNlAttr {
+ // Already aligned.
+ public static final int NLA_HEADERLEN = 4;
+ public static final int NLA_F_NESTED = (1 << 15);
+
+ public static short makeNestedType(short type) {
+ return (short) (type | NLA_F_NESTED);
+ }
+
+ // Return a (length, type) object only, without consuming any bytes in
+ // |byteBuffer| and without copying or interpreting any value bytes.
+ // This is used for scanning over a packed set of struct nlattr's,
+ // looking for instances of a particular type.
+ public static StructNlAttr peek(ByteBuffer byteBuffer) {
+ if (byteBuffer == null || byteBuffer.remaining() < NLA_HEADERLEN) {
+ return null;
+ }
+ final int baseOffset = byteBuffer.position();
+
+ // Assume the byte order of the buffer is the expected byte order of the value.
+ final StructNlAttr struct = new StructNlAttr(byteBuffer.order());
+ // The byte order of nla_len and nla_type is always native.
+ final ByteOrder originalOrder = byteBuffer.order();
+ byteBuffer.order(ByteOrder.nativeOrder());
+ try {
+ struct.nla_len = byteBuffer.getShort();
+ struct.nla_type = byteBuffer.getShort();
+ } finally {
+ byteBuffer.order(originalOrder);
+ }
+
+ byteBuffer.position(baseOffset);
+ if (struct.nla_len < NLA_HEADERLEN) {
+ // Malformed.
+ return null;
+ }
+ return struct;
+ }
+
+ public static StructNlAttr parse(ByteBuffer byteBuffer) {
+ final StructNlAttr struct = peek(byteBuffer);
+ if (struct == null || byteBuffer.remaining() < struct.getAlignedLength()) {
+ return null;
+ }
+
+ final int baseOffset = byteBuffer.position();
+ byteBuffer.position(baseOffset + NLA_HEADERLEN);
+
+ int valueLen = ((int) struct.nla_len) & 0xffff;
+ valueLen -= NLA_HEADERLEN;
+ if (valueLen > 0) {
+ struct.nla_value = new byte[valueLen];
+ byteBuffer.get(struct.nla_value, 0, valueLen);
+ byteBuffer.position(baseOffset + struct.getAlignedLength());
+ }
+ return struct;
+ }
+
+ public short nla_len = (short) NLA_HEADERLEN;
+ public short nla_type;
+ public byte[] nla_value;
+
+ // The byte order used to read/write the value member. Netlink length and
+ // type members are always read/written in native order.
+ private ByteOrder mByteOrder = ByteOrder.nativeOrder();
+
+ public StructNlAttr() {}
+
+ public StructNlAttr(ByteOrder byteOrder) {
+ mByteOrder = byteOrder;
+ }
+
+ public StructNlAttr(short type, byte value) {
+ nla_type = type;
+ setValue(new byte[1]);
+ nla_value[0] = value;
+ }
+
+ public StructNlAttr(short type, short value) {
+ this(type, value, ByteOrder.nativeOrder());
+ }
+
+ public StructNlAttr(short type, short value, ByteOrder order) {
+ this(order);
+ nla_type = type;
+ setValue(new byte[Short.BYTES]);
+ getValueAsByteBuffer().putShort(value);
+ }
+
+ public StructNlAttr(short type, int value) {
+ this(type, value, ByteOrder.nativeOrder());
+ }
+
+ public StructNlAttr(short type, int value, ByteOrder order) {
+ this(order);
+ nla_type = type;
+ setValue(new byte[Integer.BYTES]);
+ getValueAsByteBuffer().putInt(value);
+ }
+
+ public StructNlAttr(short type, InetAddress ip) {
+ nla_type = type;
+ setValue(ip.getAddress());
+ }
+
+ public StructNlAttr(short type, StructNlAttr... nested) {
+ this();
+ nla_type = makeNestedType(type);
+
+ int payloadLength = 0;
+ for (StructNlAttr nla : nested) payloadLength += nla.getAlignedLength();
+ setValue(new byte[payloadLength]);
+
+ final ByteBuffer buf = getValueAsByteBuffer();
+ for (StructNlAttr nla : nested) {
+ nla.pack(buf);
+ }
+ }
+
+ public int getAlignedLength() {
+ return NetlinkConstants.alignedLengthOf(nla_len);
+ }
+
+ public ByteBuffer getValueAsByteBuffer() {
+ if (nla_value == null) { return null; }
+ final ByteBuffer byteBuffer = ByteBuffer.wrap(nla_value);
+ byteBuffer.order(mByteOrder);
+ return byteBuffer;
+ }
+
+ public int getValueAsInt(int defaultValue) {
+ final ByteBuffer byteBuffer = getValueAsByteBuffer();
+ if (byteBuffer == null || byteBuffer.remaining() != Integer.BYTES) {
+ return defaultValue;
+ }
+ return getValueAsByteBuffer().getInt();
+ }
+
+ public InetAddress getValueAsInetAddress() {
+ if (nla_value == null) { return null; }
+
+ try {
+ return InetAddress.getByAddress(nla_value);
+ } catch (UnknownHostException ignored) {
+ return null;
+ }
+ }
+
+ public void pack(ByteBuffer byteBuffer) {
+ final ByteOrder originalOrder = byteBuffer.order();
+ final int originalPosition = byteBuffer.position();
+
+ byteBuffer.order(ByteOrder.nativeOrder());
+ try {
+ byteBuffer.putShort(nla_len);
+ byteBuffer.putShort(nla_type);
+ if (nla_value != null) byteBuffer.put(nla_value);
+ } finally {
+ byteBuffer.order(originalOrder);
+ }
+ byteBuffer.position(originalPosition + getAlignedLength());
+ }
+
+ private void setValue(byte[] value) {
+ nla_value = value;
+ nla_len = (short) (NLA_HEADERLEN + ((nla_value != null) ? nla_value.length : 0));
+ }
+
+ @Override
+ public String toString() {
+ return "StructNlAttr{ "
+ + "nla_len{" + nla_len + "}, "
+ + "nla_type{" + nla_type + "}, "
+ + "nla_value{" + NetlinkConstants.hexify(nla_value) + "}, "
+ + "}";
+ }
+}
diff --git a/common/netlinkclient/src/android/net/netlink/StructNlMsgErr.java b/common/netlinkclient/src/android/net/netlink/StructNlMsgErr.java
new file mode 100644
index 0000000..9ea4364
--- /dev/null
+++ b/common/netlinkclient/src/android/net/netlink/StructNlMsgErr.java
@@ -0,0 +1,68 @@
+/*
+ * Copyright (C) 2019 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 android.net.netlink;
+
+import java.nio.ByteBuffer;
+
+
+/**
+ * struct nlmsgerr
+ *
+ * see <linux_src>/include/uapi/linux/netlink.h
+ *
+ * @hide
+ */
+public class StructNlMsgErr {
+ public static final int STRUCT_SIZE = Integer.BYTES + StructNlMsgHdr.STRUCT_SIZE;
+
+ public static boolean hasAvailableSpace(ByteBuffer byteBuffer) {
+ return byteBuffer != null && byteBuffer.remaining() >= STRUCT_SIZE;
+ }
+
+ public static StructNlMsgErr parse(ByteBuffer byteBuffer) {
+ if (!hasAvailableSpace(byteBuffer)) { return null; }
+
+ // The ByteOrder must have already been set by the caller. In most
+ // cases ByteOrder.nativeOrder() is correct, with the exception
+ // of usage within unittests.
+ final StructNlMsgErr struct = new StructNlMsgErr();
+ struct.error = byteBuffer.getInt();
+ struct.msg = StructNlMsgHdr.parse(byteBuffer);
+ return struct;
+ }
+
+ public int error;
+ public StructNlMsgHdr msg;
+
+ public void pack(ByteBuffer byteBuffer) {
+ // The ByteOrder must have already been set by the caller. In most
+ // cases ByteOrder.nativeOrder() is correct, with the possible
+ // exception of usage within unittests.
+ byteBuffer.putInt(error);
+ if (msg != null) {
+ msg.pack(byteBuffer);
+ }
+ }
+
+ @Override
+ public String toString() {
+ return "StructNlMsgErr{ "
+ + "error{" + error + "}, "
+ + "msg{" + (msg == null ? "" : msg.toString()) + "} "
+ + "}";
+ }
+}
diff --git a/common/netlinkclient/src/android/net/netlink/StructNlMsgHdr.java b/common/netlinkclient/src/android/net/netlink/StructNlMsgHdr.java
new file mode 100644
index 0000000..1d03a49
--- /dev/null
+++ b/common/netlinkclient/src/android/net/netlink/StructNlMsgHdr.java
@@ -0,0 +1,139 @@
+/*
+ * Copyright (C) 2019 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 android.net.netlink;
+
+import java.nio.ByteBuffer;
+
+
+/**
+ * struct nlmsghdr
+ *
+ * see <linux_src>/include/uapi/linux/netlink.h
+ *
+ * @hide
+ */
+public class StructNlMsgHdr {
+ // Already aligned.
+ public static final int STRUCT_SIZE = 16;
+
+ public static final short NLM_F_REQUEST = 0x0001;
+ public static final short NLM_F_MULTI = 0x0002;
+ public static final short NLM_F_ACK = 0x0004;
+ public static final short NLM_F_ECHO = 0x0008;
+ // Flags for a GET request.
+ public static final short NLM_F_ROOT = 0x0100;
+ public static final short NLM_F_MATCH = 0x0200;
+ public static final short NLM_F_DUMP = NLM_F_ROOT|NLM_F_MATCH;
+ // Flags for a NEW request.
+ public static final short NLM_F_REPLACE = 0x100;
+ public static final short NLM_F_EXCL = 0x200;
+ public static final short NLM_F_CREATE = 0x400;
+ public static final short NLM_F_APPEND = 0x800;
+
+
+ public static String stringForNlMsgFlags(short flags) {
+ final StringBuilder sb = new StringBuilder();
+ if ((flags & NLM_F_REQUEST) != 0) {
+ sb.append("NLM_F_REQUEST");
+ }
+ if ((flags & NLM_F_MULTI) != 0) {
+ if (sb.length() > 0) { sb.append("|"); }
+ sb.append("NLM_F_MULTI");
+ }
+ if ((flags & NLM_F_ACK) != 0) {
+ if (sb.length() > 0) { sb.append("|"); }
+ sb.append("NLM_F_ACK");
+ }
+ if ((flags & NLM_F_ECHO) != 0) {
+ if (sb.length() > 0) { sb.append("|"); }
+ sb.append("NLM_F_ECHO");
+ }
+ if ((flags & NLM_F_ROOT) != 0) {
+ if (sb.length() > 0) { sb.append("|"); }
+ sb.append("NLM_F_ROOT");
+ }
+ if ((flags & NLM_F_MATCH) != 0) {
+ if (sb.length() > 0) { sb.append("|"); }
+ sb.append("NLM_F_MATCH");
+ }
+ return sb.toString();
+ }
+
+ public static boolean hasAvailableSpace(ByteBuffer byteBuffer) {
+ return byteBuffer != null && byteBuffer.remaining() >= STRUCT_SIZE;
+ }
+
+ public static StructNlMsgHdr parse(ByteBuffer byteBuffer) {
+ if (!hasAvailableSpace(byteBuffer)) { return null; }
+
+ // The ByteOrder must have already been set by the caller. In most
+ // cases ByteOrder.nativeOrder() is correct, with the exception
+ // of usage within unittests.
+ final StructNlMsgHdr struct = new StructNlMsgHdr();
+ struct.nlmsg_len = byteBuffer.getInt();
+ struct.nlmsg_type = byteBuffer.getShort();
+ struct.nlmsg_flags = byteBuffer.getShort();
+ struct.nlmsg_seq = byteBuffer.getInt();
+ struct.nlmsg_pid = byteBuffer.getInt();
+
+ if (struct.nlmsg_len < STRUCT_SIZE) {
+ // Malformed.
+ return null;
+ }
+ return struct;
+ }
+
+ public int nlmsg_len;
+ public short nlmsg_type;
+ public short nlmsg_flags;
+ public int nlmsg_seq;
+ public int nlmsg_pid;
+
+ public StructNlMsgHdr() {
+ nlmsg_len = 0;
+ nlmsg_type = 0;
+ nlmsg_flags = 0;
+ nlmsg_seq = 0;
+ nlmsg_pid = 0;
+ }
+
+ public void pack(ByteBuffer byteBuffer) {
+ // The ByteOrder must have already been set by the caller. In most
+ // cases ByteOrder.nativeOrder() is correct, with the possible
+ // exception of usage within unittests.
+ byteBuffer.putInt(nlmsg_len);
+ byteBuffer.putShort(nlmsg_type);
+ byteBuffer.putShort(nlmsg_flags);
+ byteBuffer.putInt(nlmsg_seq);
+ byteBuffer.putInt(nlmsg_pid);
+ }
+
+ @Override
+ public String toString() {
+ final String typeStr = "" + nlmsg_type
+ + "(" + NetlinkConstants.stringForNlMsgType(nlmsg_type) + ")";
+ final String flagsStr = "" + nlmsg_flags
+ + "(" + stringForNlMsgFlags(nlmsg_flags) + ")";
+ return "StructNlMsgHdr{ "
+ + "nlmsg_len{" + nlmsg_len + "}, "
+ + "nlmsg_type{" + typeStr + "}, "
+ + "nlmsg_flags{" + flagsStr + ")}, "
+ + "nlmsg_seq{" + nlmsg_seq + "}, "
+ + "nlmsg_pid{" + nlmsg_pid + "} "
+ + "}";
+ }
+}