IpReachabilityMonitor.java revision f188d41fa2876a4c77586656bce06cac10d08942
1787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline/* 2787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline * Copyright (C) 2015 The Android Open Source Project 3787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline * 4787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline * Licensed under the Apache License, Version 2.0 (the "License"); 5787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline * you may not use this file except in compliance with the License. 6787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline * You may obtain a copy of the License at 7787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline * 8787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline * http://www.apache.org/licenses/LICENSE-2.0 9787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline * 10787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline * Unless required by applicable law or agreed to in writing, software 11787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline * distributed under the License is distributed on an "AS IS" BASIS, 12787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline * See the License for the specific language governing permissions and 14787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline * limitations under the License. 15787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline */ 16787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline 1702cc5a030a6f132e776b754dd5684ae632009f76Erik Klinepackage android.net.ip; 18787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline 19b1eebaeb926c698eded5a892484fd9904b36cd69Erik Klineimport com.android.internal.annotations.GuardedBy; 20b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline 2176fde62da7487d60910d3fa025dc6db5971f95d8Erik Klineimport android.content.Context; 22787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Klineimport android.net.LinkAddress; 23787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Klineimport android.net.LinkProperties; 24b1eebaeb926c698eded5a892484fd9904b36cd69Erik Klineimport android.net.LinkProperties.ProvisioningChange; 25787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Klineimport android.net.ProxyInfo; 26787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Klineimport android.net.RouteInfo; 27787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Klineimport android.net.netlink.NetlinkConstants; 28787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Klineimport android.net.netlink.NetlinkErrorMessage; 29787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Klineimport android.net.netlink.NetlinkMessage; 30787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Klineimport android.net.netlink.NetlinkSocket; 31787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Klineimport android.net.netlink.RtNetlinkNeighborMessage; 32787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Klineimport android.net.netlink.StructNdaCacheInfo; 33787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Klineimport android.net.netlink.StructNdMsg; 34787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Klineimport android.net.netlink.StructNlMsgHdr; 3576fde62da7487d60910d3fa025dc6db5971f95d8Erik Klineimport android.os.PowerManager; 36787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Klineimport android.os.SystemClock; 37787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Klineimport android.system.ErrnoException; 38787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Klineimport android.system.NetlinkSocketAddress; 39787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Klineimport android.system.OsConstants; 40787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Klineimport android.util.Log; 41787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline 42787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Klineimport java.io.InterruptedIOException; 43787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Klineimport java.net.InetAddress; 44787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Klineimport java.net.InetSocketAddress; 45787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Klineimport java.net.NetworkInterface; 46787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Klineimport java.net.SocketAddress; 47787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Klineimport java.net.SocketException; 48787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Klineimport java.nio.ByteBuffer; 49787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Klineimport java.util.Arrays; 50787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Klineimport java.util.HashMap; 51787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Klineimport java.util.HashSet; 52787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Klineimport java.util.List; 53b1eebaeb926c698eded5a892484fd9904b36cd69Erik Klineimport java.util.Map; 54787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Klineimport java.util.Set; 55787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline 56787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline 57787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline/** 58787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline * IpReachabilityMonitor. 59787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline * 60787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline * Monitors on-link IP reachability and notifies callers whenever any on-link 61787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline * addresses of interest appear to have become unresponsive. 62787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline * 6341480898f3e98437285455efbb9b64a2c23733dfErik Kline * This code does not concern itself with "why" a neighbour might have become 6441480898f3e98437285455efbb9b64a2c23733dfErik Kline * unreachable. Instead, it primarily reacts to the kernel's notion of IP 6541480898f3e98437285455efbb9b64a2c23733dfErik Kline * reachability for each of the neighbours we know to be critically important 6641480898f3e98437285455efbb9b64a2c23733dfErik Kline * to normal network connectivity. As such, it is often "just the messenger": 6741480898f3e98437285455efbb9b64a2c23733dfErik Kline * the neighbours about which it warns are already deemed by the kernel to have 6841480898f3e98437285455efbb9b64a2c23733dfErik Kline * become unreachable. 6941480898f3e98437285455efbb9b64a2c23733dfErik Kline * 7041480898f3e98437285455efbb9b64a2c23733dfErik Kline * 7141480898f3e98437285455efbb9b64a2c23733dfErik Kline * How it works: 7241480898f3e98437285455efbb9b64a2c23733dfErik Kline * 7341480898f3e98437285455efbb9b64a2c23733dfErik Kline * 1. The "on-link neighbours of interest" found in a given LinkProperties 7441480898f3e98437285455efbb9b64a2c23733dfErik Kline * instance are added to a "watch list" via #updateLinkProperties(). 7541480898f3e98437285455efbb9b64a2c23733dfErik Kline * This usually means all default gateways and any on-link DNS servers. 7641480898f3e98437285455efbb9b64a2c23733dfErik Kline * 7741480898f3e98437285455efbb9b64a2c23733dfErik Kline * 2. We listen continuously for netlink neighbour messages (RTM_NEWNEIGH, 7841480898f3e98437285455efbb9b64a2c23733dfErik Kline * RTM_DELNEIGH), watching only for neighbours in the watch list. 7941480898f3e98437285455efbb9b64a2c23733dfErik Kline * 8041480898f3e98437285455efbb9b64a2c23733dfErik Kline * - A neighbour going into NUD_REACHABLE, NUD_STALE, NUD_DELAY, and 8141480898f3e98437285455efbb9b64a2c23733dfErik Kline * even NUD_PROBE is perfectly normal; we merely record the new state. 8241480898f3e98437285455efbb9b64a2c23733dfErik Kline * 8341480898f3e98437285455efbb9b64a2c23733dfErik Kline * - A neighbour's entry may be deleted (RTM_DELNEIGH), for example due 8441480898f3e98437285455efbb9b64a2c23733dfErik Kline * to garbage collection. This is not necessarily of immediate 8541480898f3e98437285455efbb9b64a2c23733dfErik Kline * concern; we record the neighbour as moving to NUD_NONE. 8641480898f3e98437285455efbb9b64a2c23733dfErik Kline * 8741480898f3e98437285455efbb9b64a2c23733dfErik Kline * - A neighbour transitioning to NUD_FAILED (for any reason) is 8841480898f3e98437285455efbb9b64a2c23733dfErik Kline * critically important and is handled as described below in #4. 8941480898f3e98437285455efbb9b64a2c23733dfErik Kline * 9041480898f3e98437285455efbb9b64a2c23733dfErik Kline * 3. All on-link neighbours in the watch list can be forcibly "probed" by 9141480898f3e98437285455efbb9b64a2c23733dfErik Kline * calling #probeAll(). This should be called whenever it is important to 9241480898f3e98437285455efbb9b64a2c23733dfErik Kline * verify that critical neighbours on the link are still reachable, e.g. 9341480898f3e98437285455efbb9b64a2c23733dfErik Kline * when roaming between BSSIDs. 9441480898f3e98437285455efbb9b64a2c23733dfErik Kline * 9541480898f3e98437285455efbb9b64a2c23733dfErik Kline * - The kernel will send unicast ARP requests for IPv4 neighbours and 9641480898f3e98437285455efbb9b64a2c23733dfErik Kline * unicast NS packets for IPv6 neighbours. The expected replies will 9741480898f3e98437285455efbb9b64a2c23733dfErik Kline * likely be unicast. 9841480898f3e98437285455efbb9b64a2c23733dfErik Kline * 9941480898f3e98437285455efbb9b64a2c23733dfErik Kline * - The forced probing is done holding a wakelock. The kernel may, 10041480898f3e98437285455efbb9b64a2c23733dfErik Kline * however, initiate probing of a neighbor on its own, i.e. whenever 10141480898f3e98437285455efbb9b64a2c23733dfErik Kline * a neighbour has expired from NUD_DELAY. 10241480898f3e98437285455efbb9b64a2c23733dfErik Kline * 10341480898f3e98437285455efbb9b64a2c23733dfErik Kline * - The kernel sends: 10441480898f3e98437285455efbb9b64a2c23733dfErik Kline * 10541480898f3e98437285455efbb9b64a2c23733dfErik Kline * /proc/sys/net/ipv{4,6}/neigh/<ifname>/ucast_solicit 10641480898f3e98437285455efbb9b64a2c23733dfErik Kline * 10741480898f3e98437285455efbb9b64a2c23733dfErik Kline * number of probes (usually 3) every: 10841480898f3e98437285455efbb9b64a2c23733dfErik Kline * 10941480898f3e98437285455efbb9b64a2c23733dfErik Kline * /proc/sys/net/ipv{4,6}/neigh/<ifname>/retrans_time_ms 11041480898f3e98437285455efbb9b64a2c23733dfErik Kline * 11141480898f3e98437285455efbb9b64a2c23733dfErik Kline * number of milliseconds (usually 1000ms). This normally results in 11241480898f3e98437285455efbb9b64a2c23733dfErik Kline * 3 unicast packets, 1 per second. 11341480898f3e98437285455efbb9b64a2c23733dfErik Kline * 11441480898f3e98437285455efbb9b64a2c23733dfErik Kline * - If no response is received to any of the probe packets, the kernel 11541480898f3e98437285455efbb9b64a2c23733dfErik Kline * marks the neighbour as being in state NUD_FAILED, and the listening 11641480898f3e98437285455efbb9b64a2c23733dfErik Kline * process in #2 will learn of it. 11741480898f3e98437285455efbb9b64a2c23733dfErik Kline * 11841480898f3e98437285455efbb9b64a2c23733dfErik Kline * 4. We call the supplied Callback#notifyLost() function if the loss of a 11941480898f3e98437285455efbb9b64a2c23733dfErik Kline * neighbour in NUD_FAILED would cause IPv4 or IPv6 configuration to 12041480898f3e98437285455efbb9b64a2c23733dfErik Kline * become incomplete (a loss of provisioning). 12141480898f3e98437285455efbb9b64a2c23733dfErik Kline * 12241480898f3e98437285455efbb9b64a2c23733dfErik Kline * - For example, losing all our IPv4 on-link DNS servers (or losing 12341480898f3e98437285455efbb9b64a2c23733dfErik Kline * our only IPv6 default gateway) constitutes a loss of IPv4 (IPv6) 12441480898f3e98437285455efbb9b64a2c23733dfErik Kline * provisioning; Callback#notifyLost() would be called. 12541480898f3e98437285455efbb9b64a2c23733dfErik Kline * 12641480898f3e98437285455efbb9b64a2c23733dfErik Kline * - Since it can be non-trivial to reacquire certain IP provisioning 12741480898f3e98437285455efbb9b64a2c23733dfErik Kline * state it may be best for the link to disconnect completely and 12841480898f3e98437285455efbb9b64a2c23733dfErik Kline * reconnect afresh. 12941480898f3e98437285455efbb9b64a2c23733dfErik Kline * 13041480898f3e98437285455efbb9b64a2c23733dfErik Kline * 131787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline * @hide 132787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline */ 133787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Klinepublic class IpReachabilityMonitor { 134787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline private static final String TAG = "IpReachabilityMonitor"; 135f188d41fa2876a4c77586656bce06cac10d08942Joe Onorato private static final boolean DBG = false; 136787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline private static final boolean VDBG = false; 137787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline 138787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline public interface Callback { 139b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline // This callback function must execute as quickly as possible as it is 140b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline // run on the same thread that listens to kernel neighbor updates. 141b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline // 142b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline // TODO: refactor to something like notifyProvisioningLost(String msg). 143787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline public void notifyLost(InetAddress ip, String logMsg); 144787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } 145787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline 146787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline private final Object mLock = new Object(); 14776fde62da7487d60910d3fa025dc6db5971f95d8Erik Kline private final PowerManager.WakeLock mWakeLock; 148787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline private final String mInterfaceName; 149787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline private final int mInterfaceIndex; 150787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline private final Callback mCallback; 151abd3142dcae02026689b939c363329b822b7cc0aErik Kline private final NetlinkSocketObserver mNetlinkSocketObserver; 152abd3142dcae02026689b939c363329b822b7cc0aErik Kline private final Thread mObserverThread; 153b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline @GuardedBy("mLock") 154b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline private LinkProperties mLinkProperties = new LinkProperties(); 155b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline // TODO: consider a map to a private NeighborState class holding more 156b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline // information than a single NUD state entry. 157b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline @GuardedBy("mLock") 158b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline private Map<InetAddress, Short> mIpWatchList = new HashMap<>(); 159b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline @GuardedBy("mLock") 160b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline private int mIpWatchListVersion; 161b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline @GuardedBy("mLock") 162b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline private boolean mRunning; 163787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline 164cef7bc939fbc3baae5ccf78dcef63fc60e07ae21Erik Kline /** 165cef7bc939fbc3baae5ccf78dcef63fc60e07ae21Erik Kline * Make the kernel to perform neighbor reachability detection (IPv4 ARP or IPv6 ND) 166cef7bc939fbc3baae5ccf78dcef63fc60e07ae21Erik Kline * for the given IP address on the specified interface index. 167cef7bc939fbc3baae5ccf78dcef63fc60e07ae21Erik Kline * 168cef7bc939fbc3baae5ccf78dcef63fc60e07ae21Erik Kline * @return true, if the request was successfully passed to the kernel; false otherwise. 169cef7bc939fbc3baae5ccf78dcef63fc60e07ae21Erik Kline */ 170cef7bc939fbc3baae5ccf78dcef63fc60e07ae21Erik Kline public static boolean probeNeighbor(int ifIndex, InetAddress ip) { 171cef7bc939fbc3baae5ccf78dcef63fc60e07ae21Erik Kline final long IO_TIMEOUT = 300L; 172b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline final String msgSnippet = "probing ip=" + ip.getHostAddress() + "%" + ifIndex; 173b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline if (DBG) { Log.d(TAG, msgSnippet); } 174cef7bc939fbc3baae5ccf78dcef63fc60e07ae21Erik Kline 175cef7bc939fbc3baae5ccf78dcef63fc60e07ae21Erik Kline final byte[] msg = RtNetlinkNeighborMessage.newNewNeighborMessage( 1762027d85cbe2559a3f12aa2ac70af2b556788ec4cErik Kline 1, ip, StructNdMsg.NUD_PROBE, ifIndex, null); 177cef7bc939fbc3baae5ccf78dcef63fc60e07ae21Erik Kline boolean returnValue = false; 178cef7bc939fbc3baae5ccf78dcef63fc60e07ae21Erik Kline 179b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline try (NetlinkSocket nlSocket = new NetlinkSocket(OsConstants.NETLINK_ROUTE)) { 180cef7bc939fbc3baae5ccf78dcef63fc60e07ae21Erik Kline nlSocket.connectToKernel(); 181cef7bc939fbc3baae5ccf78dcef63fc60e07ae21Erik Kline nlSocket.sendMessage(msg, 0, msg.length, IO_TIMEOUT); 182cef7bc939fbc3baae5ccf78dcef63fc60e07ae21Erik Kline final ByteBuffer bytes = nlSocket.recvMessage(IO_TIMEOUT); 183cef7bc939fbc3baae5ccf78dcef63fc60e07ae21Erik Kline final NetlinkMessage response = NetlinkMessage.parse(bytes); 184cef7bc939fbc3baae5ccf78dcef63fc60e07ae21Erik Kline if (response != null && response instanceof NetlinkErrorMessage && 185cef7bc939fbc3baae5ccf78dcef63fc60e07ae21Erik Kline (((NetlinkErrorMessage) response).getNlMsgError() != null) && 186cef7bc939fbc3baae5ccf78dcef63fc60e07ae21Erik Kline (((NetlinkErrorMessage) response).getNlMsgError().error == 0)) { 187cef7bc939fbc3baae5ccf78dcef63fc60e07ae21Erik Kline returnValue = true; 188cef7bc939fbc3baae5ccf78dcef63fc60e07ae21Erik Kline } else { 189cef7bc939fbc3baae5ccf78dcef63fc60e07ae21Erik Kline String errmsg; 190cef7bc939fbc3baae5ccf78dcef63fc60e07ae21Erik Kline if (bytes == null) { 191cef7bc939fbc3baae5ccf78dcef63fc60e07ae21Erik Kline errmsg = "null recvMessage"; 192cef7bc939fbc3baae5ccf78dcef63fc60e07ae21Erik Kline } else if (response == null) { 193cef7bc939fbc3baae5ccf78dcef63fc60e07ae21Erik Kline bytes.position(0); 194cef7bc939fbc3baae5ccf78dcef63fc60e07ae21Erik Kline errmsg = "raw bytes: " + NetlinkConstants.hexify(bytes); 195cef7bc939fbc3baae5ccf78dcef63fc60e07ae21Erik Kline } else { 196b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline // TODO: consider ignoring EINVAL (-22), which appears to be 197b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline // normal when probing a neighbor for which the kernel does 198b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline // not already have / no longer has a link layer address. 199cef7bc939fbc3baae5ccf78dcef63fc60e07ae21Erik Kline errmsg = response.toString(); 200cef7bc939fbc3baae5ccf78dcef63fc60e07ae21Erik Kline } 201b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline Log.e(TAG, "Error " + msgSnippet + ", errmsg=" + errmsg); 202cef7bc939fbc3baae5ccf78dcef63fc60e07ae21Erik Kline } 203cef7bc939fbc3baae5ccf78dcef63fc60e07ae21Erik Kline } catch (ErrnoException | InterruptedIOException | SocketException e) { 204b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline Log.d(TAG, "Error " + msgSnippet, e); 205cef7bc939fbc3baae5ccf78dcef63fc60e07ae21Erik Kline } 206cef7bc939fbc3baae5ccf78dcef63fc60e07ae21Erik Kline 207cef7bc939fbc3baae5ccf78dcef63fc60e07ae21Erik Kline return returnValue; 208cef7bc939fbc3baae5ccf78dcef63fc60e07ae21Erik Kline } 209cef7bc939fbc3baae5ccf78dcef63fc60e07ae21Erik Kline 21076fde62da7487d60910d3fa025dc6db5971f95d8Erik Kline public IpReachabilityMonitor(Context context, String ifName, Callback callback) 21176fde62da7487d60910d3fa025dc6db5971f95d8Erik Kline throws IllegalArgumentException { 212787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline mInterfaceName = ifName; 213787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline int ifIndex = -1; 214787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline try { 215787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline NetworkInterface netIf = NetworkInterface.getByName(ifName); 216787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline mInterfaceIndex = netIf.getIndex(); 217787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } catch (SocketException | NullPointerException e) { 218787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline throw new IllegalArgumentException("invalid interface '" + ifName + "': ", e); 219787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } 22076fde62da7487d60910d3fa025dc6db5971f95d8Erik Kline mWakeLock = ((PowerManager) context.getSystemService(Context.POWER_SERVICE)).newWakeLock( 22176fde62da7487d60910d3fa025dc6db5971f95d8Erik Kline PowerManager.PARTIAL_WAKE_LOCK, TAG + "." + mInterfaceName); 222787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline mCallback = callback; 223abd3142dcae02026689b939c363329b822b7cc0aErik Kline mNetlinkSocketObserver = new NetlinkSocketObserver(); 224abd3142dcae02026689b939c363329b822b7cc0aErik Kline mObserverThread = new Thread(mNetlinkSocketObserver); 225787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline mObserverThread.start(); 226787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } 227787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline 228787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline public void stop() { 229abd3142dcae02026689b939c363329b822b7cc0aErik Kline synchronized (mLock) { mRunning = false; } 230abd3142dcae02026689b939c363329b822b7cc0aErik Kline clearLinkProperties(); 231abd3142dcae02026689b939c363329b822b7cc0aErik Kline mNetlinkSocketObserver.clearNetlinkSocket(); 232787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } 233787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline 234787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline // TODO: add a public dump() method that can be called during a bug report. 235787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline 236787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline private String describeWatchList() { 237b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline final String delimiter = ", "; 238b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline StringBuilder sb = new StringBuilder(); 239787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline synchronized (mLock) { 240b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline sb.append("iface{" + mInterfaceName + "/" + mInterfaceIndex + "}, "); 241b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline sb.append("v{" + mIpWatchListVersion + "}, "); 242b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline sb.append("ntable=["); 243b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline boolean firstTime = true; 244b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline for (Map.Entry<InetAddress, Short> entry : mIpWatchList.entrySet()) { 245b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline if (firstTime) { 246b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline firstTime = false; 247b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline } else { 248b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline sb.append(delimiter); 249b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline } 250b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline sb.append(entry.getKey().getHostAddress() + "/" + 251b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline StructNdMsg.stringForNudState(entry.getValue())); 252b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline } 253b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline sb.append("]"); 254787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } 255b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline return sb.toString(); 256787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } 257787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline 258787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline private boolean isWatching(InetAddress ip) { 259787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline synchronized (mLock) { 260b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline return mRunning && mIpWatchList.containsKey(ip); 261787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } 262787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } 263787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline 2649ce5d602cd5d732ae10efe0b648b43ddf60d65c9Erik Kline private boolean stillRunning() { 2659ce5d602cd5d732ae10efe0b648b43ddf60d65c9Erik Kline synchronized (mLock) { 2669ce5d602cd5d732ae10efe0b648b43ddf60d65c9Erik Kline return mRunning; 2679ce5d602cd5d732ae10efe0b648b43ddf60d65c9Erik Kline } 2689ce5d602cd5d732ae10efe0b648b43ddf60d65c9Erik Kline } 2699ce5d602cd5d732ae10efe0b648b43ddf60d65c9Erik Kline 270b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline private static boolean isOnLink(List<RouteInfo> routes, InetAddress ip) { 271b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline for (RouteInfo route : routes) { 272b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline if (!route.hasGateway() && route.matches(ip)) { 273b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline return true; 274b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline } 275b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline } 276b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline return false; 277b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline } 278b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline 279b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline private short getNeighborStateLocked(InetAddress ip) { 280b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline if (mIpWatchList.containsKey(ip)) { 281b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline return mIpWatchList.get(ip); 282b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline } 283b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline return StructNdMsg.NUD_NONE; 284b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline } 285b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline 286787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline public void updateLinkProperties(LinkProperties lp) { 287787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline if (!mInterfaceName.equals(lp.getInterfaceName())) { 288b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline // TODO: figure out whether / how to cope with interface changes. 289787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline Log.wtf(TAG, "requested LinkProperties interface '" + lp.getInterfaceName() + 290787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline "' does not match: " + mInterfaceName); 291787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline return; 292787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } 293787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline 294787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline synchronized (mLock) { 295b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline mLinkProperties = new LinkProperties(lp); 296b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline Map<InetAddress, Short> newIpWatchList = new HashMap<>(); 297b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline 298b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline final List<RouteInfo> routes = mLinkProperties.getRoutes(); 299b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline for (RouteInfo route : routes) { 300b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline if (route.hasGateway()) { 301b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline InetAddress gw = route.getGateway(); 302b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline if (isOnLink(routes, gw)) { 303b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline newIpWatchList.put(gw, getNeighborStateLocked(gw)); 304b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline } 305b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline } 306b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline } 307b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline 308b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline for (InetAddress nameserver : lp.getDnsServers()) { 309b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline if (isOnLink(routes, nameserver)) { 310b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline newIpWatchList.put(nameserver, getNeighborStateLocked(nameserver)); 311b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline } 312b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline } 313b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline 314b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline mIpWatchList = newIpWatchList; 315787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline mIpWatchListVersion++; 316787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } 317787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline if (DBG) { Log.d(TAG, "watch: " + describeWatchList()); } 318787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } 319787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline 320787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline public void clearLinkProperties() { 321787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline synchronized (mLock) { 322b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline mLinkProperties.clear(); 323787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline mIpWatchList.clear(); 324787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline mIpWatchListVersion++; 325787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } 326787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline if (DBG) { Log.d(TAG, "clear: " + describeWatchList()); } 327787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } 328787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline 329b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline private void handleNeighborLost(String msg) { 330b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline InetAddress ip = null; 331b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline ProvisioningChange delta; 332b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline synchronized (mLock) { 333b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline LinkProperties whatIfLp = new LinkProperties(mLinkProperties); 334b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline 335b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline for (Map.Entry<InetAddress, Short> entry : mIpWatchList.entrySet()) { 336b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline if (entry.getValue() != StructNdMsg.NUD_FAILED) { 337b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline continue; 338b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline } 339b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline 340b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline ip = entry.getKey(); 341b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline for (RouteInfo route : mLinkProperties.getRoutes()) { 342b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline if (ip.equals(route.getGateway())) { 343b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline whatIfLp.removeRoute(route); 344b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline } 345b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline } 346b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline whatIfLp.removeDnsServer(ip); 347b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline } 348b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline 349b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline delta = LinkProperties.compareProvisioning(mLinkProperties, whatIfLp); 350787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } 351b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline 352b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline if (delta == ProvisioningChange.LOST_PROVISIONING) { 353b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline final String logMsg = "FAILURE: LOST_PROVISIONING, " + msg; 354b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline Log.w(TAG, logMsg); 355b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline if (mCallback != null) { 356b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline // TODO: remove |ip| when the callback signature no longer has 357b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline // an InetAddress argument. 358b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline mCallback.notifyLost(ip, logMsg); 359b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline } 360787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } 361787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } 362787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline 3639ce5d602cd5d732ae10efe0b648b43ddf60d65c9Erik Kline public void probeAll() { 3649ce5d602cd5d732ae10efe0b648b43ddf60d65c9Erik Kline Set<InetAddress> ipProbeList = new HashSet<InetAddress>(); 3659ce5d602cd5d732ae10efe0b648b43ddf60d65c9Erik Kline synchronized (mLock) { 366b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline ipProbeList.addAll(mIpWatchList.keySet()); 3679ce5d602cd5d732ae10efe0b648b43ddf60d65c9Erik Kline } 36876fde62da7487d60910d3fa025dc6db5971f95d8Erik Kline 36976fde62da7487d60910d3fa025dc6db5971f95d8Erik Kline if (!ipProbeList.isEmpty() && stillRunning()) { 37076fde62da7487d60910d3fa025dc6db5971f95d8Erik Kline // Keep the CPU awake long enough to allow all ARP/ND 37176fde62da7487d60910d3fa025dc6db5971f95d8Erik Kline // probes a reasonable chance at success. See b/23197666. 37276fde62da7487d60910d3fa025dc6db5971f95d8Erik Kline // 37376fde62da7487d60910d3fa025dc6db5971f95d8Erik Kline // The wakelock we use is (by default) refcounted, and this version 37476fde62da7487d60910d3fa025dc6db5971f95d8Erik Kline // of acquire(timeout) queues a release message to keep acquisitions 37576fde62da7487d60910d3fa025dc6db5971f95d8Erik Kline // and releases balanced. 37676fde62da7487d60910d3fa025dc6db5971f95d8Erik Kline mWakeLock.acquire(getProbeWakeLockDuration()); 37776fde62da7487d60910d3fa025dc6db5971f95d8Erik Kline } 37876fde62da7487d60910d3fa025dc6db5971f95d8Erik Kline 3799ce5d602cd5d732ae10efe0b648b43ddf60d65c9Erik Kline for (InetAddress target : ipProbeList) { 380cef7bc939fbc3baae5ccf78dcef63fc60e07ae21Erik Kline if (!stillRunning()) { 381cef7bc939fbc3baae5ccf78dcef63fc60e07ae21Erik Kline break; 3829ce5d602cd5d732ae10efe0b648b43ddf60d65c9Erik Kline } 383cef7bc939fbc3baae5ccf78dcef63fc60e07ae21Erik Kline probeNeighbor(mInterfaceIndex, target); 3849ce5d602cd5d732ae10efe0b648b43ddf60d65c9Erik Kline } 3859ce5d602cd5d732ae10efe0b648b43ddf60d65c9Erik Kline } 3869ce5d602cd5d732ae10efe0b648b43ddf60d65c9Erik Kline 38776fde62da7487d60910d3fa025dc6db5971f95d8Erik Kline private long getProbeWakeLockDuration() { 38876fde62da7487d60910d3fa025dc6db5971f95d8Erik Kline // Ideally, this would be computed by examining the values of: 38976fde62da7487d60910d3fa025dc6db5971f95d8Erik Kline // 39076fde62da7487d60910d3fa025dc6db5971f95d8Erik Kline // /proc/sys/net/ipv[46]/neigh/<ifname>/ucast_solicit 39176fde62da7487d60910d3fa025dc6db5971f95d8Erik Kline // 39276fde62da7487d60910d3fa025dc6db5971f95d8Erik Kline // and: 39376fde62da7487d60910d3fa025dc6db5971f95d8Erik Kline // 39476fde62da7487d60910d3fa025dc6db5971f95d8Erik Kline // /proc/sys/net/ipv[46]/neigh/<ifname>/retrans_time_ms 39576fde62da7487d60910d3fa025dc6db5971f95d8Erik Kline // 39676fde62da7487d60910d3fa025dc6db5971f95d8Erik Kline // For now, just make some assumptions. 39776fde62da7487d60910d3fa025dc6db5971f95d8Erik Kline final long numUnicastProbes = 3; 39876fde62da7487d60910d3fa025dc6db5971f95d8Erik Kline final long retransTimeMs = 1000; 39976fde62da7487d60910d3fa025dc6db5971f95d8Erik Kline final long gracePeriodMs = 500; 40076fde62da7487d60910d3fa025dc6db5971f95d8Erik Kline return (numUnicastProbes * retransTimeMs) + gracePeriodMs; 40176fde62da7487d60910d3fa025dc6db5971f95d8Erik Kline } 40276fde62da7487d60910d3fa025dc6db5971f95d8Erik Kline 403787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline 404abd3142dcae02026689b939c363329b822b7cc0aErik Kline // TODO: simply the number of objects by making this extend Thread. 405787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline private final class NetlinkSocketObserver implements Runnable { 406787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline private NetlinkSocket mSocket; 407787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline 408787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline @Override 409787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline public void run() { 410787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline if (VDBG) { Log.d(TAG, "Starting observing thread."); } 411787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline synchronized (mLock) { mRunning = true; } 412787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline 413787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline try { 414787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline setupNetlinkSocket(); 415787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } catch (ErrnoException | SocketException e) { 416787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline Log.e(TAG, "Failed to suitably initialize a netlink socket", e); 417787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline synchronized (mLock) { mRunning = false; } 418787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } 419787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline 420787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline ByteBuffer byteBuffer; 421787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline while (stillRunning()) { 422787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline try { 423787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline byteBuffer = recvKernelReply(); 424787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } catch (ErrnoException e) { 4251c01e61c90d74a8acace18466d5aa6538440cd15Erik Kline if (stillRunning()) { Log.w(TAG, "ErrnoException: ", e); } 426787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline break; 427787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } 428787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline final long whenMs = SystemClock.elapsedRealtime(); 429787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline if (byteBuffer == null) { 430787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline continue; 431787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } 432787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline parseNetlinkMessageBuffer(byteBuffer, whenMs); 433787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } 434787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline 435787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline clearNetlinkSocket(); 436787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline 437787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline synchronized (mLock) { mRunning = false; } 438787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline if (VDBG) { Log.d(TAG, "Finishing observing thread."); } 439787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } 440787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline 441787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline private void clearNetlinkSocket() { 442787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline if (mSocket != null) { 443787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline mSocket.close(); 444787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } 445787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } 446787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline 447787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline // TODO: Refactor the main loop to recreate the socket upon recoverable errors. 448787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline private void setupNetlinkSocket() throws ErrnoException, SocketException { 449787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline clearNetlinkSocket(); 450787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline mSocket = new NetlinkSocket(OsConstants.NETLINK_ROUTE); 451787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline 452787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline final NetlinkSocketAddress listenAddr = new NetlinkSocketAddress( 453787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline 0, OsConstants.RTMGRP_NEIGH); 454787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline mSocket.bind(listenAddr); 455787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline 456787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline if (VDBG) { 457787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline final NetlinkSocketAddress nlAddr = mSocket.getLocalAddress(); 458787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline Log.d(TAG, "bound to sockaddr_nl{" 459787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline + ((long) (nlAddr.getPortId() & 0xffffffff)) + ", " 460787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline + nlAddr.getGroupsMask() 461787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline + "}"); 462787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } 463787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } 464787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline 465787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline private ByteBuffer recvKernelReply() throws ErrnoException { 466787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline try { 467787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline return mSocket.recvMessage(0); 468787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } catch (InterruptedIOException e) { 469787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline // Interruption or other error, e.g. another thread closed our file descriptor. 470787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } catch (ErrnoException e) { 471787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline if (e.errno != OsConstants.EAGAIN) { 472787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline throw e; 473787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } 474787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } 475787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline return null; 476787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } 477787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline 478787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline private void parseNetlinkMessageBuffer(ByteBuffer byteBuffer, long whenMs) { 479787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline while (byteBuffer.remaining() > 0) { 480787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline final int position = byteBuffer.position(); 481787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline final NetlinkMessage nlMsg = NetlinkMessage.parse(byteBuffer); 482787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline if (nlMsg == null || nlMsg.getHeader() == null) { 483787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline byteBuffer.position(position); 484787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline Log.e(TAG, "unparsable netlink msg: " + NetlinkConstants.hexify(byteBuffer)); 485787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline break; 486787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } 487787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline 488787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline final int srcPortId = nlMsg.getHeader().nlmsg_pid; 489787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline if (srcPortId != 0) { 490787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline Log.e(TAG, "non-kernel source portId: " + ((long) (srcPortId & 0xffffffff))); 491787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline break; 492787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } 493787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline 494787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline if (nlMsg instanceof NetlinkErrorMessage) { 495787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline Log.e(TAG, "netlink error: " + nlMsg); 496787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline continue; 497787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } else if (!(nlMsg instanceof RtNetlinkNeighborMessage)) { 498787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline if (DBG) { 499787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline Log.d(TAG, "non-rtnetlink neighbor msg: " + nlMsg); 500787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } 501787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline continue; 502787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } 503787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline 504787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline evaluateRtNetlinkNeighborMessage((RtNetlinkNeighborMessage) nlMsg, whenMs); 505787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } 506787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } 507787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline 508787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline private void evaluateRtNetlinkNeighborMessage( 509787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline RtNetlinkNeighborMessage neighMsg, long whenMs) { 510787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline final StructNdMsg ndMsg = neighMsg.getNdHeader(); 511787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline if (ndMsg == null || ndMsg.ndm_ifindex != mInterfaceIndex) { 512787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline return; 513787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } 514787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline 515787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline final InetAddress destination = neighMsg.getDestination(); 516787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline if (!isWatching(destination)) { 517787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline return; 518787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } 519787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline 520787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline final short msgType = neighMsg.getHeader().nlmsg_type; 521787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline final short nudState = ndMsg.ndm_state; 522787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline final String eventMsg = "NeighborEvent{" 523787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline + "elapsedMs=" + whenMs + ", " 524787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline + destination.getHostAddress() + ", " 525787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline + "[" + NetlinkConstants.hexify(neighMsg.getLinkLayerAddress()) + "], " 526787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline + NetlinkConstants.stringForNlMsgType(msgType) + ", " 527787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline + StructNdMsg.stringForNudState(nudState) 528787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline + "}"; 529787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline 530787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline if (VDBG) { 531787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline Log.d(TAG, neighMsg.toString()); 532787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } else if (DBG) { 533787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline Log.d(TAG, eventMsg); 534787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } 535787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline 536b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline synchronized (mLock) { 537b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline if (mIpWatchList.containsKey(destination)) { 538b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline final short value = 539b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline (msgType == NetlinkConstants.RTM_DELNEIGH) 540ab06923576d4a49bc84c94badfcebcb7f6b103a8Erik Kline ? StructNdMsg.NUD_NONE 541b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline : nudState; 542b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline mIpWatchList.put(destination, value); 543b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline } 544b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline } 545b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline 546ab06923576d4a49bc84c94badfcebcb7f6b103a8Erik Kline if (nudState == StructNdMsg.NUD_FAILED) { 547b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline Log.w(TAG, "ALERT: " + eventMsg); 548b1eebaeb926c698eded5a892484fd9904b36cd69Erik Kline handleNeighborLost(eventMsg); 549787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } 550787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } 551787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline } 552787d935611c8a6d1ed66e4d718f78084fe7bd3c5Erik Kline} 553