diff -r 000000000000 -r 6474c204b198 dom/system/gonk/NetworkUtils.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/system/gonk/NetworkUtils.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,1735 @@
+/* Copyright 2012 Mozilla Foundation and Mozilla contributors
+ *
+ * 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.
+ */
+
+#include "NetworkUtils.h"
+
+#include <android/log.h>
+#include <cutils/properties.h>
+#include <limits>
+#include "mozilla/dom/network/NetUtils.h"
+
+#include <sys/types.h>  // struct addrinfo
+#include <sys/socket.h> // getaddrinfo(), freeaddrinfo()
+#include <netdb.h>
+#include <arpa/inet.h>  // inet_ntop()
+
+#define _DEBUG 0
+
+#define WARN(args...)   __android_log_print(ANDROID_LOG_WARN,  "NetworkUtils", ## args)
+#define ERROR(args...)  __android_log_print(ANDROID_LOG_ERROR,  "NetworkUtils", ## args)
+
+#if _DEBUG
+#define DEBUG(args...)  __android_log_print(ANDROID_LOG_DEBUG, "NetworkUtils" , ## args)
+#else
+#define DEBUG(args...)
+#endif
+
+using namespace mozilla::dom;
+using namespace mozilla::ipc;
+
+static const char* PERSIST_SYS_USB_CONFIG_PROPERTY = "persist.sys.usb.config";
+static const char* SYS_USB_CONFIG_PROPERTY         = "sys.usb.config";
+static const char* SYS_USB_STATE_PROPERTY          = "sys.usb.state";
+
+static const char* USB_FUNCTION_RNDIS  = "rndis";
+static const char* USB_FUNCTION_ADB    = "adb";
+
+// Use this command to continue the function chain.
+static const char* DUMMY_COMMAND = "tether status";
+
+// Retry 20 times (2 seconds) for usb state transition.
+static const uint32_t USB_FUNCTION_RETRY_TIMES = 20;
+// Check "sys.usb.state" every 100ms.
+static const uint32_t USB_FUNCTION_RETRY_INTERVAL = 100;
+
+// 1xx - Requested action is proceeding
+static const uint32_t NETD_COMMAND_PROCEEDING   = 100;
+// 2xx - Requested action has been successfully completed
+static const uint32_t NETD_COMMAND_OKAY         = 200;
+// 4xx - The command is accepted but the requested action didn't
+// take place.
+static const uint32_t NETD_COMMAND_FAIL         = 400;
+// 5xx - The command syntax or parameters error
+static const uint32_t NETD_COMMAND_ERROR        = 500;
+// 6xx - Unsolicited broadcasts
+static const uint32_t NETD_COMMAND_UNSOLICITED  = 600;
+
+// Broadcast messages
+static const uint32_t NETD_COMMAND_INTERFACE_CHANGE     = 600;
+static const uint32_t NETD_COMMAND_BANDWIDTH_CONTROLLER = 601;
+
+static const char* INTERFACE_DELIMIT = ",";
+static const char* USB_CONFIG_DELIMIT = ",";
+static const char* NETD_MESSAGE_DELIMIT = " ";
+
+static const uint32_t BUF_SIZE = 1024;
+
+static uint32_t SDK_VERSION;
+
+struct IFProperties {
+  char gateway[PROPERTY_VALUE_MAX];
+  char dns1[PROPERTY_VALUE_MAX];
+  char dns2[PROPERTY_VALUE_MAX];
+};
+
+struct CurrentCommand {
+  CommandChain* chain;
+  CommandCallback callback;
+  char command[MAX_COMMAND_SIZE];
+};
+
+typedef Tuple3<NetdCommand*, CommandChain*, CommandCallback> QueueData;
+
+#define GET_CURRENT_NETD_COMMAND   (gCommandQueue.IsEmpty() ? nullptr : gCommandQueue[0].a)
+#define GET_CURRENT_CHAIN          (gCommandQueue.IsEmpty() ? nullptr : gCommandQueue[0].b)
+#define GET_CURRENT_CALLBACK       (gCommandQueue.IsEmpty() ? nullptr : gCommandQueue[0].c)
+#define GET_CURRENT_COMMAND        (gCommandQueue.IsEmpty() ? nullptr : gCommandQueue[0].a->mData)
+
+static NetworkUtils* gNetworkUtils;
+static nsTArray<QueueData> gCommandQueue;
+static CurrentCommand gCurrentCommand;
+static bool gPending = false;
+static nsTArray<nsCString> gReason;
+
+CommandFunc NetworkUtils::sWifiEnableChain[] = {
+  NetworkUtils::wifiFirmwareReload,
+  NetworkUtils::startAccessPointDriver,
+  NetworkUtils::setAccessPoint,
+  NetworkUtils::startSoftAP,
+  NetworkUtils::setInterfaceUp,
+  NetworkUtils::tetherInterface,
+  NetworkUtils::setIpForwardingEnabled,
+  NetworkUtils::tetheringStatus,
+  NetworkUtils::startTethering,
+  NetworkUtils::setDnsForwarders,
+  NetworkUtils::enableNat,
+  NetworkUtils::wifiTetheringSuccess
+};
+
+CommandFunc NetworkUtils::sWifiDisableChain[] = {
+  NetworkUtils::stopSoftAP,
+  NetworkUtils::stopAccessPointDriver,
+  NetworkUtils::wifiFirmwareReload,
+  NetworkUtils::untetherInterface,
+  NetworkUtils::preTetherInterfaceList,
+  NetworkUtils::postTetherInterfaceList,
+  NetworkUtils::disableNat,
+  NetworkUtils::setIpForwardingEnabled,
+  NetworkUtils::stopTethering,
+  NetworkUtils::wifiTetheringSuccess
+};
+
+CommandFunc NetworkUtils::sWifiFailChain[] = {
+  NetworkUtils::stopSoftAP,
+  NetworkUtils::setIpForwardingEnabled,
+  NetworkUtils::stopTethering
+};
+
+CommandFunc NetworkUtils::sWifiOperationModeChain[] = {
+  NetworkUtils::wifiFirmwareReload,
+  NetworkUtils::wifiOperationModeSuccess
+};
+
+CommandFunc NetworkUtils::sUSBEnableChain[] = {
+  NetworkUtils::setInterfaceUp,
+  NetworkUtils::enableNat,
+  NetworkUtils::setIpForwardingEnabled,
+  NetworkUtils::tetherInterface,
+  NetworkUtils::tetheringStatus,
+  NetworkUtils::startTethering,
+  NetworkUtils::setDnsForwarders,
+  NetworkUtils::usbTetheringSuccess
+};
+
+CommandFunc NetworkUtils::sUSBDisableChain[] = {
+  NetworkUtils::untetherInterface,
+  NetworkUtils::preTetherInterfaceList,
+  NetworkUtils::postTetherInterfaceList,
+  NetworkUtils::disableNat,
+  NetworkUtils::setIpForwardingEnabled,
+  NetworkUtils::stopTethering,
+  NetworkUtils::usbTetheringSuccess
+};
+
+CommandFunc NetworkUtils::sUSBFailChain[] = {
+  NetworkUtils::stopSoftAP,
+  NetworkUtils::setIpForwardingEnabled,
+  NetworkUtils::stopTethering
+};
+
+CommandFunc NetworkUtils::sUpdateUpStreamChain[] = {
+  NetworkUtils::cleanUpStream,
+  NetworkUtils::createUpStream,
+  NetworkUtils::updateUpStreamSuccess
+};
+
+CommandFunc NetworkUtils::sStartDhcpServerChain[] = {
+  NetworkUtils::setInterfaceUp,
+  NetworkUtils::startTethering,
+  NetworkUtils::setDhcpServerSuccess
+};
+
+CommandFunc NetworkUtils::sStopDhcpServerChain[] = {
+  NetworkUtils::stopTethering,
+  NetworkUtils::setDhcpServerSuccess
+};
+
+CommandFunc NetworkUtils::sNetworkInterfaceStatsChain[] = {
+  NetworkUtils::getRxBytes,
+  NetworkUtils::getTxBytes,
+  NetworkUtils::networkInterfaceStatsSuccess
+};
+
+CommandFunc NetworkUtils::sNetworkInterfaceEnableAlarmChain[] = {
+  NetworkUtils::enableAlarm,
+  NetworkUtils::setQuota,
+  NetworkUtils::setAlarm,
+  NetworkUtils::networkInterfaceAlarmSuccess
+};
+
+CommandFunc NetworkUtils::sNetworkInterfaceDisableAlarmChain[] = {
+  NetworkUtils::removeQuota,
+  NetworkUtils::disableAlarm,
+  NetworkUtils::networkInterfaceAlarmSuccess
+};
+
+CommandFunc NetworkUtils::sNetworkInterfaceSetAlarmChain[] = {
+  NetworkUtils::setAlarm,
+  NetworkUtils::networkInterfaceAlarmSuccess
+};
+
+CommandFunc NetworkUtils::sSetDnsChain[] = {
+  NetworkUtils::setDefaultInterface,
+  NetworkUtils::setInterfaceDns
+};
+
+/**
+ * Helper function to get the mask from given prefix length.
+ */
+static uint32_t makeMask(const uint32_t prefixLength)
+{
+  uint32_t mask = 0;
+  for (uint32_t i = 0; i < prefixLength; ++i) {
+    mask |= (0x80000000 >> i);
+  }
+  return ntohl(mask);
+}
+
+/**
+ * Helper function to get the network part of an ip from prefix.
+ * param ip must be in network byte order.
+ */
+static char* getNetworkAddr(const uint32_t ip, const uint32_t prefix)
+{
+  uint32_t mask = 0, subnet = 0;
+
+  mask = ~mask << (32 - prefix);
+  mask = htonl(mask);
+  subnet = ip & mask;
+
+  struct in_addr addr;
+  addr.s_addr = subnet;
+
+  return inet_ntoa(addr);
+}
+
+/**
+ * Helper function to split string by seperator, store split result as an nsTArray.
+ */
+static void split(char* str, const char* sep, nsTArray<nsCString>& result)
+{
+  char *s = strtok(str, sep);
+  while (s != nullptr) {
+    result.AppendElement(s);
+    s = strtok(nullptr, sep);
+  }
+}
+
+static void split(char* str, const char* sep, nsTArray<nsString>& result)
+{
+  char *s = strtok(str, sep);
+  while (s != nullptr) {
+    result.AppendElement(NS_ConvertUTF8toUTF16(s));
+    s = strtok(nullptr, sep);
+  }
+}
+
+/**
+ * Helper function that implement join function.
+ */
+static void join(nsTArray<nsCString>& array,
+                 const char* sep,
+                 const uint32_t maxlen,
+                 char* result)
+{
+#define CHECK_LENGTH(len, add, max)  len += add;          \
+                                     if (len > max - 1)   \
+                                       return;            \
+
+  uint32_t len = 0;
+  uint32_t seplen = strlen(sep);
+
+  if (array.Length() > 0) {
+    CHECK_LENGTH(len, strlen(array[0].get()), maxlen)
+    strcpy(result, array[0].get());
+
+    for (uint32_t i = 1; i < array.Length(); i++) {
+      CHECK_LENGTH(len, seplen, maxlen)
+      strcat(result, sep);
+
+      CHECK_LENGTH(len, strlen(array[i].get()), maxlen)
+      strcat(result, array[i].get());
+    }
+  }
+
+#undef CHECK_LEN
+}
+
+/**
+ * Helper function to get network interface properties from the system property table.
+ */
+static void getIFProperties(const char* ifname, IFProperties& prop)
+{
+  char key[PROPERTY_KEY_MAX];
+  snprintf(key, PROPERTY_KEY_MAX - 1, "net.%s.gw", ifname);
+  property_get(key, prop.gateway, "");
+  snprintf(key, PROPERTY_KEY_MAX - 1, "net.%s.dns1", ifname);
+  property_get(key, prop.dns1, "");
+  snprintf(key, PROPERTY_KEY_MAX - 1, "net.%s.dns2", ifname);
+  property_get(key, prop.dns2, "");
+}
+
+static int getIpType(const char *aIp) {
+  struct addrinfo hint, *ip_info = NULL;
+
+  memset(&hint, 0, sizeof(hint));
+  hint.ai_family = AF_UNSPEC;
+  hint.ai_flags = AI_NUMERICHOST;
+
+  if (getaddrinfo(aIp, NULL, &hint, &ip_info)) {
+    return AF_UNSPEC;
+  }
+
+  int type = ip_info->ai_family;
+  freeaddrinfo(ip_info);
+
+  return type;
+}
+
+/**
+ * Helper function to find the best match gateway. For now, return
+ * the gateway that matches the address family passed.
+ */
+static uint32_t selectGateway(nsTArray<nsString>& gateways, int addrFamily)
+{
+  uint32_t length = gateways.Length();
+
+  for (uint32_t i = 0; i < length; i++) {
+    NS_ConvertUTF16toUTF8 autoGateway(gateways[i]);
+    if ((getIpType(autoGateway.get()) == AF_INET && addrFamily == AF_INET) ||
+        (getIpType(autoGateway.get()) == AF_INET6 && addrFamily == AF_INET6)) {
+      return i;
+    }
+  }
+  return length; // invalid index.
+}
+
+static void postMessage(NetworkResultOptions& aResult)
+{
+  MOZ_ASSERT(gNetworkUtils);
+  MOZ_ASSERT(gNetworkUtils->getMessageCallback());
+
+  if (*(gNetworkUtils->getMessageCallback()))
+    (*(gNetworkUtils->getMessageCallback()))(aResult);
+}
+
+static void postMessage(NetworkParams& aOptions, NetworkResultOptions& aResult)
+{
+  MOZ_ASSERT(gNetworkUtils);
+  MOZ_ASSERT(gNetworkUtils->getMessageCallback());
+
+  aResult.mId = aOptions.mId;
+
+  if (*(gNetworkUtils->getMessageCallback()))
+    (*(gNetworkUtils->getMessageCallback()))(aResult);
+}
+
+void NetworkUtils::next(CommandChain* aChain, bool aError, NetworkResultOptions& aResult)
+{
+  if (aError) {
+    ErrorCallback onError = aChain->getErrorCallback();
+    if(onError) {
+      aResult.mError = true;
+      (*onError)(aChain->getParams(), aResult);
+    }
+    delete aChain;
+    return;
+  }
+  CommandFunc f = aChain->getNextCommand();
+  if (!f) {
+    delete aChain;
+    return;
+  }
+
+  (*f)(aChain, next, aResult);
+}
+
+/**
+ * Send command to netd.
+ */
+void NetworkUtils::nextNetdCommand()
+{
+  if (gCommandQueue.IsEmpty() || gPending) {
+    return;
+  }
+
+  gCurrentCommand.chain = GET_CURRENT_CHAIN;
+  gCurrentCommand.callback = GET_CURRENT_CALLBACK;
+  snprintf(gCurrentCommand.command, MAX_COMMAND_SIZE - 1, "%s", GET_CURRENT_COMMAND);
+
+  DEBUG("Sending \'%s\' command to netd.", gCurrentCommand.command);
+  SendNetdCommand(GET_CURRENT_NETD_COMMAND);
+
+  gCommandQueue.RemoveElementAt(0);
+  gPending = true;
+}
+
+/**
+ * Composite NetdCommand sent to netd
+ *
+ * @param aCommand  Command sent to netd to execute.
+ * @param aChain    Store command chain data, ex. command parameter.
+ * @param aCallback Callback function to be executed when the result of
+ *                  this command is returned from netd.
+ */
+void NetworkUtils::doCommand(const char* aCommand, CommandChain* aChain, CommandCallback aCallback)
+{
+  DEBUG("Preparing to send \'%s\' command...", aCommand);
+
+  NetdCommand* netdCommand = new NetdCommand();
+
+  // Android JB version adds sequence number to netd command.
+  if (SDK_VERSION >= 16) {
+    snprintf((char*)netdCommand->mData, MAX_COMMAND_SIZE - 1, "0 %s", aCommand);
+  } else {
+    snprintf((char*)netdCommand->mData, MAX_COMMAND_SIZE - 1, "%s", aCommand);
+  }
+  netdCommand->mSize = strlen((char*)netdCommand->mData) + 1;
+
+  gCommandQueue.AppendElement(QueueData(netdCommand, aChain, aCallback));
+
+  nextNetdCommand();
+}
+
+/*
+ * Netd command function
+ */
+#define GET_CHAR(prop) NS_ConvertUTF16toUTF8(aChain->getParams().prop).get()
+#define GET_FIELD(prop) aChain->getParams().prop
+
+void NetworkUtils::wifiFirmwareReload(CommandChain* aChain,
+                                      CommandCallback aCallback,
+                                      NetworkResultOptions& aResult)
+{
+  char command[MAX_COMMAND_SIZE];
+  snprintf(command, MAX_COMMAND_SIZE - 1, "softap fwreload %s %s", GET_CHAR(mIfname), GET_CHAR(mMode));
+
+  doCommand(command, aChain, aCallback);
+}
+
+void NetworkUtils::startAccessPointDriver(CommandChain* aChain,
+                                          CommandCallback aCallback,
+                                          NetworkResultOptions& aResult)
+{
+  // Skip the command for sdk version >= 16.
+  if (SDK_VERSION >= 16) {
+    aResult.mResultCode = 0;
+    aResult.mResultReason = NS_ConvertUTF8toUTF16("");
+    aCallback(aChain, false, aResult);
+    return;
+  }
+
+  char command[MAX_COMMAND_SIZE];
+  snprintf(command, MAX_COMMAND_SIZE - 1, "softap start %s", GET_CHAR(mIfname));
+
+  doCommand(command, aChain, aCallback);
+}
+
+void NetworkUtils::stopAccessPointDriver(CommandChain* aChain,
+                                         CommandCallback aCallback,
+                                         NetworkResultOptions& aResult)
+{
+  // Skip the command for sdk version >= 16.
+  if (SDK_VERSION >= 16) {
+    aResult.mResultCode = 0;
+    aResult.mResultReason = NS_ConvertUTF8toUTF16("");
+    aCallback(aChain, false, aResult);
+    return;
+  }
+
+  char command[MAX_COMMAND_SIZE];
+  snprintf(command, MAX_COMMAND_SIZE - 1, "softap stop %s", GET_CHAR(mIfname));
+
+  doCommand(command, aChain, aCallback);
+}
+
+/**
+ * Command format for sdk version < 16
+ *   Arguments:
+ *     argv[2] - wlan interface
+ *     argv[3] - SSID
+ *     argv[4] - Security
+ *     argv[5] - Key
+ *     argv[6] - Channel
+ *     argv[7] - Preamble
+ *     argv[8] - Max SCB
+ *
+ * Command format for sdk version >= 16
+ *   Arguments:
+ *     argv[2] - wlan interface
+ *     argv[3] - SSID
+ *     argv[4] - Security
+ *     argv[5] - Key
+ *
+ * Command format for sdk version >= 18
+ *   Arguments:
+ *      argv[2] - wlan interface
+ *      argv[3] - SSID
+ *      argv[4] - Broadcast/Hidden
+ *      argv[5] - Channel
+ *      argv[6] - Security
+ *      argv[7] - Key
+ */
+void NetworkUtils::setAccessPoint(CommandChain* aChain,
+                                  CommandCallback aCallback,
+                                  NetworkResultOptions& aResult)
+{
+  char command[MAX_COMMAND_SIZE];
+  nsCString ssid(GET_CHAR(mSsid));
+  nsCString key(GET_CHAR(mKey));
+
+  escapeQuote(ssid);
+  escapeQuote(key);
+
+  if (SDK_VERSION >= 19) {
+    snprintf(command, MAX_COMMAND_SIZE - 1, "softap set %s \"%s\" broadcast 6 %s \"%s\"",
+                     GET_CHAR(mIfname),
+                     ssid.get(),
+                     GET_CHAR(mSecurity),
+                     key.get());
+  } else if (SDK_VERSION >= 16) {
+    snprintf(command, MAX_COMMAND_SIZE - 1, "softap set %s \"%s\" %s \"%s\"",
+                     GET_CHAR(mIfname),
+                     ssid.get(),
+                     GET_CHAR(mSecurity),
+                     key.get());
+  } else {
+    snprintf(command, MAX_COMMAND_SIZE - 1, "softap set %s %s \"%s\" %s \"%s\" 6 0 8",
+                     GET_CHAR(mIfname),
+                     GET_CHAR(mWifictrlinterfacename),
+                     ssid.get(),
+                     GET_CHAR(mSecurity),
+                     key.get());
+  }
+
+  doCommand(command, aChain, aCallback);
+}
+
+void NetworkUtils::cleanUpStream(CommandChain* aChain,
+                                 CommandCallback aCallback,
+                                 NetworkResultOptions& aResult)
+{
+  char command[MAX_COMMAND_SIZE];
+  snprintf(command, MAX_COMMAND_SIZE - 1, "nat disable %s %s 0", GET_CHAR(mPreInternalIfname), GET_CHAR(mPreExternalIfname));
+
+  doCommand(command, aChain, aCallback);
+}
+
+void NetworkUtils::createUpStream(CommandChain* aChain,
+                                  CommandCallback aCallback,
+                                  NetworkResultOptions& aResult)
+{
+  char command[MAX_COMMAND_SIZE];
+  snprintf(command, MAX_COMMAND_SIZE - 1, "nat enable %s %s 0", GET_CHAR(mCurInternalIfname), GET_CHAR(mCurExternalIfname));
+
+  doCommand(command, aChain, aCallback);
+}
+
+void NetworkUtils::startSoftAP(CommandChain* aChain,
+                               CommandCallback aCallback,
+                               NetworkResultOptions& aResult)
+{
+  const char* command= "softap startap";
+  doCommand(command, aChain, aCallback);
+}
+
+void NetworkUtils::stopSoftAP(CommandChain* aChain,
+                              CommandCallback aCallback,
+                              NetworkResultOptions& aResult)
+{
+  const char* command= "softap stopap";
+  doCommand(command, aChain, aCallback);
+}
+
+void NetworkUtils::getRxBytes(CommandChain* aChain,
+                              CommandCallback aCallback,
+                              NetworkResultOptions& aResult)
+{
+  char command[MAX_COMMAND_SIZE];
+  snprintf(command, MAX_COMMAND_SIZE - 1, "interface readrxcounter %s", GET_CHAR(mIfname));
+
+  doCommand(command, aChain, aCallback);
+}
+
+void NetworkUtils::getTxBytes(CommandChain* aChain,
+                              CommandCallback aCallback,
+                              NetworkResultOptions& aResult)
+{
+  NetworkParams& options = aChain->getParams();
+  options.mRxBytes = atof(NS_ConvertUTF16toUTF8(aResult.mResultReason).get());
+
+  char command[MAX_COMMAND_SIZE];
+  snprintf(command, MAX_COMMAND_SIZE - 1, "interface readtxcounter %s", GET_CHAR(mIfname));
+
+  doCommand(command, aChain, aCallback);
+}
+
+void NetworkUtils::enableAlarm(CommandChain* aChain,
+                               CommandCallback aCallback,
+                               NetworkResultOptions& aResult)
+{
+  const char* command= "bandwidth enable";
+  doCommand(command, aChain, aCallback);
+}
+
+void NetworkUtils::disableAlarm(CommandChain* aChain,
+                                CommandCallback aCallback,
+                                NetworkResultOptions& aResult)
+{
+  const char* command= "bandwidth disable";
+  doCommand(command, aChain, aCallback);
+}
+
+void NetworkUtils::setQuota(CommandChain* aChain,
+                            CommandCallback aCallback,
+                            NetworkResultOptions& aResult)
+{
+  char command[MAX_COMMAND_SIZE];
+  snprintf(command, MAX_COMMAND_SIZE - 1, "bandwidth setiquota %s %lld", GET_CHAR(mIfname), LLONG_MAX);
+
+  doCommand(command, aChain, aCallback);
+}
+
+void NetworkUtils::removeQuota(CommandChain* aChain,
+                               CommandCallback aCallback,
+                               NetworkResultOptions& aResult)
+{
+  char command[MAX_COMMAND_SIZE];
+  snprintf(command, MAX_COMMAND_SIZE - 1, "bandwidth removeiquota %s", GET_CHAR(mIfname));
+
+  doCommand(command, aChain, aCallback);
+}
+
+void NetworkUtils::setAlarm(CommandChain* aChain,
+                            CommandCallback aCallback,
+                            NetworkResultOptions& aResult)
+{
+  char command[MAX_COMMAND_SIZE];
+  snprintf(command, MAX_COMMAND_SIZE - 1, "bandwidth setinterfacealert %s %ld", GET_CHAR(mIfname), GET_FIELD(mThreshold));
+
+  doCommand(command, aChain, aCallback);
+}
+
+void NetworkUtils::setInterfaceUp(CommandChain* aChain,
+                                  CommandCallback aCallback,
+                                  NetworkResultOptions& aResult)
+{
+  char command[MAX_COMMAND_SIZE];
+  if (SDK_VERSION >= 16) {
+    snprintf(command, MAX_COMMAND_SIZE - 1, "interface setcfg %s %s %s %s",
+                     GET_CHAR(mIfname),
+                     GET_CHAR(mIp),
+                     GET_CHAR(mPrefix),
+                     GET_CHAR(mLink));
+  } else {
+    snprintf(command, MAX_COMMAND_SIZE - 1, "interface setcfg %s %s %s [%s]",
+                     GET_CHAR(mIfname),
+                     GET_CHAR(mIp),
+                     GET_CHAR(mPrefix),
+                     GET_CHAR(mLink));
+  }
+  doCommand(command, aChain, aCallback);
+}
+
+void NetworkUtils::tetherInterface(CommandChain* aChain,
+                                   CommandCallback aCallback,
+                                   NetworkResultOptions& aResult)
+{
+  char command[MAX_COMMAND_SIZE];
+  snprintf(command, MAX_COMMAND_SIZE - 1, "tether interface add %s", GET_CHAR(mIfname));
+
+  doCommand(command, aChain, aCallback);
+}
+
+void NetworkUtils::preTetherInterfaceList(CommandChain* aChain,
+                                          CommandCallback aCallback,
+                                          NetworkResultOptions& aResult)
+{
+  char command[MAX_COMMAND_SIZE];
+  if (SDK_VERSION >= 16) {
+    snprintf(command, MAX_COMMAND_SIZE - 1, "tether interface list");
+  } else {
+    snprintf(command, MAX_COMMAND_SIZE - 1, "tether interface list 0");
+  }
+
+  doCommand(command, aChain, aCallback);
+}
+
+void NetworkUtils::postTetherInterfaceList(CommandChain* aChain,
+                                           CommandCallback aCallback,
+                                           NetworkResultOptions& aResult)
+{
+  // Send the dummy command to continue the function chain.
+  char command[MAX_COMMAND_SIZE];
+  snprintf(command, MAX_COMMAND_SIZE - 1, "%s", DUMMY_COMMAND);
+
+  char buf[BUF_SIZE];
+  const char* reason = NS_ConvertUTF16toUTF8(aResult.mResultReason).get();
+  memcpy(buf, reason, strlen(reason));
+  split(buf, INTERFACE_DELIMIT, GET_FIELD(mInterfaceList));
+
+  doCommand(command, aChain, aCallback);
+}
+
+void NetworkUtils::setIpForwardingEnabled(CommandChain* aChain,
+                                          CommandCallback aCallback,
+                                          NetworkResultOptions& aResult)
+{
+  char command[MAX_COMMAND_SIZE];
+
+  if (GET_FIELD(mEnable)) {
+    snprintf(command, MAX_COMMAND_SIZE - 1, "ipfwd enable");
+  } else {
+    // Don't disable ip forwarding because others interface still need it.
+    // Send the dummy command to continue the function chain.
+    if (GET_FIELD(mInterfaceList).Length() > 1) {
+      snprintf(command, MAX_COMMAND_SIZE - 1, "%s", DUMMY_COMMAND);
+    } else {
+      snprintf(command, MAX_COMMAND_SIZE - 1, "ipfwd disable");
+    }
+  }
+
+  doCommand(command, aChain, aCallback);
+}
+
+void NetworkUtils::tetheringStatus(CommandChain* aChain,
+                                   CommandCallback aCallback,
+                                   NetworkResultOptions& aResult)
+{
+  const char* command= "tether status";
+  doCommand(command, aChain, aCallback);
+}
+
+void NetworkUtils::stopTethering(CommandChain* aChain,
+                                 CommandCallback aCallback,
+                                 NetworkResultOptions& aResult)
+{
+  char command[MAX_COMMAND_SIZE];
+
+  // Don't stop tethering because others interface still need it.
+  // Send the dummy to continue the function chain.
+  if (GET_FIELD(mInterfaceList).Length() > 1) {
+    snprintf(command, MAX_COMMAND_SIZE - 1, "%s", DUMMY_COMMAND);
+  } else {
+    snprintf(command, MAX_COMMAND_SIZE - 1, "tether stop");
+  }
+
+  doCommand(command, aChain, aCallback);
+}
+
+void NetworkUtils::startTethering(CommandChain* aChain,
+                                  CommandCallback aCallback,
+                                  NetworkResultOptions& aResult)
+{
+  char command[MAX_COMMAND_SIZE];
+
+  // We don't need to start tethering again.
+  // Send the dummy command to continue the function chain.
+  if (aResult.mResultReason.Find("started") != kNotFound) {
+    snprintf(command, MAX_COMMAND_SIZE - 1, "%s", DUMMY_COMMAND);
+  } else {
+    snprintf(command, MAX_COMMAND_SIZE - 1, "tether start %s %s", GET_CHAR(mWifiStartIp), GET_CHAR(mWifiEndIp));
+
+    // If usbStartIp/usbEndIp is not valid, don't append them since
+    // the trailing white spaces will be parsed to extra empty args
+    // See: http://androidxref.com/4.3_r2.1/xref/system/core/libsysutils/src/FrameworkListener.cpp#78
+    if (!GET_FIELD(mUsbStartIp).IsEmpty() && !GET_FIELD(mUsbEndIp).IsEmpty()) {
+      snprintf(command, MAX_COMMAND_SIZE - 1, "%s %s %s", command, GET_CHAR(mUsbStartIp), GET_CHAR(mUsbEndIp));
+    }
+  }
+
+  doCommand(command, aChain, aCallback);
+}
+
+void NetworkUtils::untetherInterface(CommandChain* aChain,
+                                     CommandCallback aCallback,
+                                     NetworkResultOptions& aResult)
+{
+  char command[MAX_COMMAND_SIZE];
+  snprintf(command, MAX_COMMAND_SIZE - 1, "tether interface remove %s", GET_CHAR(mIfname));
+
+  doCommand(command, aChain, aCallback);
+}
+
+void NetworkUtils::setDnsForwarders(CommandChain* aChain,
+                                    CommandCallback aCallback,
+                                    NetworkResultOptions& aResult)
+{
+  char command[MAX_COMMAND_SIZE];
+  snprintf(command, MAX_COMMAND_SIZE - 1, "tether dns set %s %s", GET_CHAR(mDns1), GET_CHAR(mDns2));
+
+  doCommand(command, aChain, aCallback);
+}
+
+void NetworkUtils::enableNat(CommandChain* aChain,
+                             CommandCallback aCallback,
+                             NetworkResultOptions& aResult)
+{
+  char command[MAX_COMMAND_SIZE];
+
+  if (!GET_FIELD(mIp).IsEmpty() && !GET_FIELD(mPrefix).IsEmpty()) {
+    uint32_t prefix = atoi(GET_CHAR(mPrefix));
+    uint32_t ip = inet_addr(GET_CHAR(mIp));
+    char* networkAddr = getNetworkAddr(ip, prefix);
+
+    // address/prefix will only take effect when secondary routing table exists.
+    snprintf(command, MAX_COMMAND_SIZE - 1, "nat enable %s %s 1 %s/%s",
+      GET_CHAR(mInternalIfname), GET_CHAR(mExternalIfname), networkAddr,
+      GET_CHAR(mPrefix));
+  } else {
+    snprintf(command, MAX_COMMAND_SIZE - 1, "nat enable %s %s 0",
+      GET_CHAR(mInternalIfname), GET_CHAR(mExternalIfname));
+  }
+
+  doCommand(command, aChain, aCallback);
+}
+
+void NetworkUtils::disableNat(CommandChain* aChain,
+                              CommandCallback aCallback,
+                              NetworkResultOptions& aResult)
+{
+  char command[MAX_COMMAND_SIZE];
+
+  if (!GET_FIELD(mIp).IsEmpty() && !GET_FIELD(mPrefix).IsEmpty()) {
+    uint32_t prefix = atoi(GET_CHAR(mPrefix));
+    uint32_t ip = inet_addr(GET_CHAR(mIp));
+    char* networkAddr = getNetworkAddr(ip, prefix);
+
+    snprintf(command, MAX_COMMAND_SIZE - 1, "nat disable %s %s 1 %s/%s",
+      GET_CHAR(mInternalIfname), GET_CHAR(mExternalIfname), networkAddr,
+      GET_CHAR(mPrefix));
+  } else {
+    snprintf(command, MAX_COMMAND_SIZE - 1, "nat disable %s %s 0",
+      GET_CHAR(mInternalIfname), GET_CHAR(mExternalIfname));
+  }
+
+  doCommand(command, aChain, aCallback);
+}
+
+void NetworkUtils::setDefaultInterface(CommandChain* aChain,
+                                       CommandCallback aCallback,
+                                       NetworkResultOptions& aResult)
+{
+  char command[MAX_COMMAND_SIZE];
+  snprintf(command, MAX_COMMAND_SIZE - 1, "resolver setdefaultif %s", GET_CHAR(mIfname));
+
+  doCommand(command, aChain, aCallback);
+}
+
+void NetworkUtils::setInterfaceDns(CommandChain* aChain,
+                                   CommandCallback aCallback,
+                                   NetworkResultOptions& aResult)
+{
+  char command[MAX_COMMAND_SIZE];
+  int written = snprintf(command, sizeof command, "resolver setifdns %s %s",
+                         GET_CHAR(mIfname), GET_CHAR(mDomain));
+
+  nsTArray<nsString>& dnses = GET_FIELD(mDnses);
+  uint32_t length = dnses.Length();
+
+  for (uint32_t i = 0; i < length; i++) {
+    NS_ConvertUTF16toUTF8 autoDns(dnses[i]);
+
+    int ret = snprintf(command + written, sizeof(command) - written, " %s", autoDns.get());
+    if (ret <= 1) {
+      command[written] = '\0';
+      continue;
+    }
+
+    if ((ret + written) >= sizeof(command)) {
+      command[written] = '\0';
+      break;
+    }
+
+    written += ret;
+  }
+
+  doCommand(command, aChain, aCallback);
+}
+
+#undef GET_CHAR
+#undef GET_FIELD
+
+/*
+ * Netd command success/fail function
+ */
+#define ASSIGN_FIELD(prop)  aResult.prop = aChain->getParams().prop;
+#define ASSIGN_FIELD_VALUE(prop, value)  aResult.prop = value;
+
+#define RUN_CHAIN(param, cmds, err)                                \
+  uint32_t size = sizeof(cmds) / sizeof(CommandFunc);              \
+  CommandChain* chain = new CommandChain(param, cmds, size, err);  \
+  NetworkResultOptions result;                                     \
+  next(chain, false, result);
+
+void NetworkUtils::wifiTetheringFail(NetworkParams& aOptions, NetworkResultOptions& aResult)
+{
+  // Notify the main thread.
+  postMessage(aOptions, aResult);
+
+  // If one of the stages fails, we try roll back to ensure
+  // we don't leave the network systems in limbo.
+  ASSIGN_FIELD_VALUE(mEnable, false)
+  RUN_CHAIN(aOptions, sWifiFailChain, nullptr)
+}
+
+void NetworkUtils::wifiTetheringSuccess(CommandChain* aChain,
+                                        CommandCallback aCallback,
+                                        NetworkResultOptions& aResult)
+{
+  ASSIGN_FIELD(mEnable)
+  postMessage(aChain->getParams(), aResult);
+}
+
+void NetworkUtils::usbTetheringFail(NetworkParams& aOptions,
+                                    NetworkResultOptions& aResult)
+{
+  // Notify the main thread.
+  postMessage(aOptions, aResult);
+  // Try to roll back to ensure
+  // we don't leave the network systems in limbo.
+  // This parameter is used to disable ipforwarding.
+  {
+    aOptions.mEnable = false;
+    RUN_CHAIN(aOptions, sUSBFailChain, nullptr)
+  }
+
+  // Disable usb rndis function.
+  {
+    NetworkParams options;
+    options.mEnable = false;
+    options.mReport = false;
+    gNetworkUtils->enableUsbRndis(options);
+  }
+}
+
+void NetworkUtils::usbTetheringSuccess(CommandChain* aChain,
+                                       CommandCallback aCallback,
+                                       NetworkResultOptions& aResult)
+{
+  ASSIGN_FIELD(mEnable)
+  postMessage(aChain->getParams(), aResult);
+}
+
+void NetworkUtils::networkInterfaceStatsFail(NetworkParams& aOptions, NetworkResultOptions& aResult)
+{
+  postMessage(aOptions, aResult);
+}
+
+void NetworkUtils::networkInterfaceStatsSuccess(CommandChain* aChain,
+                                                CommandCallback aCallback,
+                                                NetworkResultOptions& aResult)
+{
+  ASSIGN_FIELD(mRxBytes)
+  ASSIGN_FIELD_VALUE(mTxBytes, atof(NS_ConvertUTF16toUTF8(aResult.mResultReason).get()))
+  postMessage(aChain->getParams(), aResult);
+}
+
+void NetworkUtils::networkInterfaceAlarmFail(NetworkParams& aOptions, NetworkResultOptions& aResult)
+{
+  postMessage(aOptions, aResult);
+}
+
+void NetworkUtils::networkInterfaceAlarmSuccess(CommandChain* aChain,
+                                                CommandCallback aCallback,
+                                                NetworkResultOptions& aResult)
+{
+  // TODO : error is not used , and it is conflict with boolean type error.
+  // params.error = parseFloat(params.resultReason);
+  postMessage(aChain->getParams(), aResult);
+}
+
+void NetworkUtils::updateUpStreamFail(NetworkParams& aOptions, NetworkResultOptions& aResult)
+{
+  postMessage(aOptions, aResult);
+}
+
+void NetworkUtils::updateUpStreamSuccess(CommandChain* aChain,
+                                         CommandCallback aCallback,
+                                         NetworkResultOptions& aResult)
+{
+  ASSIGN_FIELD(mCurExternalIfname)
+  ASSIGN_FIELD(mCurInternalIfname)
+  postMessage(aChain->getParams(), aResult);
+}
+
+void NetworkUtils::setDhcpServerFail(NetworkParams& aOptions, NetworkResultOptions& aResult)
+{
+  aResult.mSuccess = false;
+  postMessage(aOptions, aResult);
+}
+
+void NetworkUtils::setDhcpServerSuccess(CommandChain* aChain, CommandCallback aCallback, NetworkResultOptions& aResult)
+{
+  aResult.mSuccess = true;
+  postMessage(aChain->getParams(), aResult);
+}
+
+void NetworkUtils::wifiOperationModeFail(NetworkParams& aOptions, NetworkResultOptions& aResult)
+{
+  postMessage(aOptions, aResult);
+}
+
+void NetworkUtils::wifiOperationModeSuccess(CommandChain* aChain,
+                                            CommandCallback aCallback,
+                                            NetworkResultOptions& aResult)
+{
+  postMessage(aChain->getParams(), aResult);
+}
+
+void NetworkUtils::setDnsFail(NetworkParams& aOptions, NetworkResultOptions& aResult)
+{
+  postMessage(aOptions, aResult);
+}
+
+#undef ASSIGN_FIELD
+#undef ASSIGN_FIELD_VALUE
+
+NetworkUtils::NetworkUtils(MessageCallback aCallback)
+ : mMessageCallback(aCallback)
+{
+  mNetUtils = new NetUtils();
+
+  char value[PROPERTY_VALUE_MAX];
+  property_get("ro.build.version.sdk", value, nullptr);
+  SDK_VERSION = atoi(value);
+
+  gNetworkUtils = this;
+}
+
+NetworkUtils::~NetworkUtils()
+{
+}
+
+#define GET_CHAR(prop) NS_ConvertUTF16toUTF8(aOptions.prop).get()
+#define GET_FIELD(prop) aOptions.prop
+
+void NetworkUtils::ExecuteCommand(NetworkParams aOptions)
+{
+  bool ret = true;
+
+  if (aOptions.mCmd.EqualsLiteral("removeNetworkRoute")) {
+    removeNetworkRoute(aOptions);
+  } else if (aOptions.mCmd.EqualsLiteral("setDNS")) {
+    setDNS(aOptions);
+  } else if (aOptions.mCmd.EqualsLiteral("setDefaultRouteAndDNS")) {
+    setDefaultRouteAndDNS(aOptions);
+  } else if (aOptions.mCmd.EqualsLiteral("removeDefaultRoute")) {
+    removeDefaultRoute(aOptions);
+  } else if (aOptions.mCmd.EqualsLiteral("addHostRoute")) {
+    addHostRoute(aOptions);
+  } else if (aOptions.mCmd.EqualsLiteral("removeHostRoute")) {
+    removeHostRoute(aOptions);
+  } else if (aOptions.mCmd.EqualsLiteral("removeHostRoutes")) {
+    removeHostRoutes(aOptions);
+  } else if (aOptions.mCmd.EqualsLiteral("addSecondaryRoute")) {
+    addSecondaryRoute(aOptions);
+  } else if (aOptions.mCmd.EqualsLiteral("removeSecondaryRoute")) {
+    removeSecondaryRoute(aOptions);
+  } else if (aOptions.mCmd.EqualsLiteral("getNetworkInterfaceStats")) {
+    getNetworkInterfaceStats(aOptions);
+  } else if (aOptions.mCmd.EqualsLiteral("setNetworkInterfaceAlarm")) {
+    setNetworkInterfaceAlarm(aOptions);
+  } else if (aOptions.mCmd.EqualsLiteral("enableNetworkInterfaceAlarm")) {
+    enableNetworkInterfaceAlarm(aOptions);
+  } else if (aOptions.mCmd.EqualsLiteral("disableNetworkInterfaceAlarm")) {
+    disableNetworkInterfaceAlarm(aOptions);
+  } else if (aOptions.mCmd.EqualsLiteral("setWifiOperationMode")) {
+    setWifiOperationMode(aOptions);
+  } else if (aOptions.mCmd.EqualsLiteral("setDhcpServer")) {
+    setDhcpServer(aOptions);
+  } else if (aOptions.mCmd.EqualsLiteral("setWifiTethering")) {
+    setWifiTethering(aOptions);
+  } else if (aOptions.mCmd.EqualsLiteral("setUSBTethering")) {
+    setUSBTethering(aOptions);
+  } else if (aOptions.mCmd.EqualsLiteral("enableUsbRndis")) {
+    enableUsbRndis(aOptions);
+  } else if (aOptions.mCmd.EqualsLiteral("updateUpStream")) {
+    updateUpStream(aOptions);
+  } else {
+    WARN("unknon message");
+    return;
+  }
+
+  if (!aOptions.mIsAsync) {
+    NetworkResultOptions result;
+    result.mRet = ret;
+    postMessage(aOptions, result);
+  }
+}
+
+/**
+ * Handle received data from netd.
+ */
+void NetworkUtils::onNetdMessage(NetdCommand* aCommand)
+{
+  char* data = (char*)aCommand->mData;
+
+  // get code & reason.
+  char* result = strtok(data, NETD_MESSAGE_DELIMIT);
+
+  if (!result) {
+    nextNetdCommand();
+    return;
+  }
+  uint32_t code = atoi(result);
+
+  if (!isBroadcastMessage(code) && SDK_VERSION >= 16) {
+    strtok(nullptr, NETD_MESSAGE_DELIMIT);
+  }
+
+  char* reason = strtok(nullptr, "\0");
+
+  if (isBroadcastMessage(code)) {
+    DEBUG("Receiving broadcast message from netd.");
+    DEBUG("          ==> Code: %d  Reason: %s", code, reason);
+    sendBroadcastMessage(code, reason);
+    nextNetdCommand();
+    return;
+  }
+
+   // Set pending to false before we handle next command.
+  DEBUG("Receiving \"%s\" command response from netd.", gCurrentCommand.command);
+  DEBUG("          ==> Code: %d  Reason: %s", code, reason);
+
+  gReason.AppendElement(nsCString(reason));
+
+  // 1xx response code regards as command is proceeding, we need to wait for
+  // final response code such as 2xx, 4xx and 5xx before sending next command.
+  if (isProceeding(code)) {
+    return;
+  }
+
+  if (isComplete(code)) {
+    gPending = false;
+  }
+
+  if (gCurrentCommand.callback) {
+    char buf[BUF_SIZE];
+    join(gReason, INTERFACE_DELIMIT, BUF_SIZE, buf);
+
+    NetworkResultOptions result;
+    result.mResultCode = code;
+    result.mResultReason = NS_ConvertUTF8toUTF16(buf);
+    (*gCurrentCommand.callback)(gCurrentCommand.chain, isError(code), result);
+    gReason.Clear();
+  }
+
+  // Handling pending commands if any.
+  if (isComplete(code)) {
+    nextNetdCommand();
+  }
+}
+
+/**
+ * Start/Stop DHCP server.
+ */
+bool NetworkUtils::setDhcpServer(NetworkParams& aOptions)
+{
+  if (aOptions.mEnabled) {
+    aOptions.mWifiStartIp = aOptions.mStartIp;
+    aOptions.mWifiEndIp = aOptions.mEndIp;
+    aOptions.mIp = aOptions.mServerIp;
+    aOptions.mPrefix = aOptions.mMaskLength;
+    aOptions.mLink = NS_ConvertUTF8toUTF16("up");
+
+    RUN_CHAIN(aOptions, sStartDhcpServerChain, setDhcpServerFail)
+  } else {
+    RUN_CHAIN(aOptions, sStopDhcpServerChain, setDhcpServerFail)
+  }
+  return true;
+}
+
+/**
+ * Set DNS servers for given network interface.
+ */
+bool NetworkUtils::setDNS(NetworkParams& aOptions)
+{
+  uint32_t length = aOptions.mDnses.Length();
+
+  if (length > 0) {
+    for (uint32_t i = 0; i < length; i++) {
+      NS_ConvertUTF16toUTF8 autoDns(aOptions.mDnses[i]);
+
+      char dns_prop_key[PROPERTY_VALUE_MAX];
+      snprintf(dns_prop_key, sizeof dns_prop_key, "net.dns%d", i+1);
+      property_set(dns_prop_key, autoDns.get());
+    }
+  } else {
+    // Set dnses from system properties.
+    IFProperties interfaceProperties;
+    getIFProperties(GET_CHAR(mIfname), interfaceProperties);
+
+    property_set("net.dns1", interfaceProperties.dns1);
+    property_set("net.dns2", interfaceProperties.dns2);
+  }
+
+  // Bump the DNS change property.
+  char dnschange[PROPERTY_VALUE_MAX];
+  property_get("net.dnschange", dnschange, "0");
+
+  char num[PROPERTY_VALUE_MAX];
+  snprintf(num, PROPERTY_VALUE_MAX - 1, "%d", atoi(dnschange) + 1);
+  property_set("net.dnschange", num);
+
+  // DNS needs to be set through netd since JellyBean (4.3).
+  if (SDK_VERSION >= 18) {
+    RUN_CHAIN(aOptions, sSetDnsChain, setDnsFail)
+  }
+
+  return true;
+}
+
+/**
+ * Set default route and DNS servers for given network interface.
+ */
+bool NetworkUtils::setDefaultRouteAndDNS(NetworkParams& aOptions)
+{
+  NS_ConvertUTF16toUTF8 autoIfname(aOptions.mIfname);
+
+  if (!aOptions.mOldIfname.IsEmpty()) {
+    // Remove IPv4's default route.
+    mNetUtils->do_ifc_remove_default_route(GET_CHAR(mOldIfname));
+    // Remove IPv6's default route.
+    mNetUtils->do_ifc_remove_route(GET_CHAR(mOldIfname), "::", 0, NULL);
+  }
+
+  uint32_t length = aOptions.mGateways.Length();
+  if (length > 0) {
+    for (uint32_t i = 0; i < length; i++) {
+      NS_ConvertUTF16toUTF8 autoGateway(aOptions.mGateways[i]);
+
+      int type = getIpType(autoGateway.get());
+      if (type != AF_INET && type != AF_INET6) {
+        continue;
+      }
+
+      if (type == AF_INET6) {
+        mNetUtils->do_ifc_add_route(autoIfname.get(), "::", 0, autoGateway.get());
+      } else { /* type == AF_INET */
+        mNetUtils->do_ifc_set_default_route(autoIfname.get(), inet_addr(autoGateway.get()));
+      }
+    }
+  } else {
+    // Set default froute from system properties.
+    char key[PROPERTY_KEY_MAX];
+    char gateway[PROPERTY_KEY_MAX];
+
+    snprintf(key, sizeof key - 1, "net.%s.gw", autoIfname.get());
+    property_get(key, gateway, "");
+
+    int type = getIpType(gateway);
+    if (type != AF_INET && type != AF_INET6) {
+      return false;
+    }
+
+    if (type == AF_INET6) {
+      mNetUtils->do_ifc_add_route(autoIfname.get(), "::", 0, gateway);
+    } else { /* type == AF_INET */
+      mNetUtils->do_ifc_set_default_route(autoIfname.get(), inet_addr(gateway));
+    }
+  }
+
+  setDNS(aOptions);
+  return true;
+}
+
+/**
+ * Remove default route for given network interface.
+ */
+bool NetworkUtils::removeDefaultRoute(NetworkParams& aOptions)
+{
+  uint32_t length = aOptions.mGateways.Length();
+  for (uint32_t i = 0; i < length; i++) {
+    NS_ConvertUTF16toUTF8 autoGateway(aOptions.mGateways[i]);
+
+    int type = getIpType(autoGateway.get());
+    if (type != AF_INET && type != AF_INET6) {
+      return false;
+    }
+
+    mNetUtils->do_ifc_remove_route(GET_CHAR(mIfname),
+                                   type == AF_INET ? "0.0.0.0" : "::",
+                                   0, autoGateway.get());
+  }
+
+  return true;
+}
+
+/**
+ * Add host route for given network interface.
+ */
+bool NetworkUtils::addHostRoute(NetworkParams& aOptions)
+{
+  NS_ConvertUTF16toUTF8 autoIfname(aOptions.mIfname);
+  int type, prefix;
+
+  uint32_t length = aOptions.mHostnames.Length();
+  for (uint32_t i = 0; i < length; i++) {
+    NS_ConvertUTF16toUTF8 autoHostname(aOptions.mHostnames[i]);
+
+    type = getIpType(autoHostname.get());
+    if (type != AF_INET && type != AF_INET6) {
+      continue;
+    }
+
+    uint32_t index = selectGateway(aOptions.mGateways, type);
+    if (index >= aOptions.mGateways.Length()) {
+      continue;
+    }
+
+    NS_ConvertUTF16toUTF8 autoGateway(aOptions.mGateways[index]);
+    prefix = type == AF_INET ? 32 : 128;
+    mNetUtils->do_ifc_add_route(autoIfname.get(), autoHostname.get(), prefix,
+                                autoGateway.get());
+  }
+  return true;
+}
+
+/**
+ * Remove host route for given network interface.
+ */
+bool NetworkUtils::removeHostRoute(NetworkParams& aOptions)
+{
+  NS_ConvertUTF16toUTF8 autoIfname(aOptions.mIfname);
+  int type, prefix;
+
+  uint32_t length = aOptions.mHostnames.Length();
+  for (uint32_t i = 0; i < length; i++) {
+    NS_ConvertUTF16toUTF8 autoHostname(aOptions.mHostnames[i]);
+
+    type = getIpType(autoHostname.get());
+    if (type != AF_INET && type != AF_INET6) {
+      continue;
+    }
+
+    uint32_t index = selectGateway(aOptions.mGateways, type);
+    if (index >= aOptions.mGateways.Length()) {
+      continue;
+    }
+
+    NS_ConvertUTF16toUTF8 autoGateway(aOptions.mGateways[index]);
+    prefix = type == AF_INET ? 32 : 128;
+    mNetUtils->do_ifc_remove_route(autoIfname.get(), autoHostname.get(), prefix,
+                                   autoGateway.get());
+  }
+  return true;
+}
+
+/**
+ * Remove the routes associated with the named interface.
+ */
+bool NetworkUtils::removeHostRoutes(NetworkParams& aOptions)
+{
+  mNetUtils->do_ifc_remove_host_routes(GET_CHAR(mIfname));
+  return true;
+}
+
+bool NetworkUtils::removeNetworkRoute(NetworkParams& aOptions)
+{
+  NS_ConvertUTF16toUTF8 autoIfname(aOptions.mIfname);
+  NS_ConvertUTF16toUTF8 autoIp(aOptions.mIp);
+
+  int type = getIpType(autoIp.get());
+  if (type != AF_INET && type != AF_INET6) {
+    return false;
+  }
+
+  uint32_t prefixLength = GET_FIELD(mPrefixLength);
+
+  if (type == AF_INET6) {
+    // Calculate subnet.
+    struct in6_addr in6;
+    if (inet_pton(AF_INET6, autoIp.get(), &in6) != 1) {
+      return false;
+    }
+
+    uint32_t p, i, p1, mask;
+    p = prefixLength;
+    i = 0;
+    while (i < 4) {
+      p1 = p > 32 ? 32 : p;
+      p -= p1;
+      mask = p1 ? ~0x0 << (32 - p1) : 0;
+      in6.s6_addr32[i++] &= htonl(mask);
+    }
+
+    char subnetStr[INET6_ADDRSTRLEN];
+    if (!inet_ntop(AF_INET6, &in6, subnetStr, sizeof subnetStr)) {
+      return false;
+    }
+
+    // Remove default route.
+    mNetUtils->do_ifc_remove_route(autoIfname.get(), "::", 0, NULL);
+
+    // Remove subnet route.
+    mNetUtils->do_ifc_remove_route(autoIfname.get(), subnetStr, prefixLength, NULL);
+    return true;
+  }
+
+  /* type == AF_INET */
+  uint32_t ip = inet_addr(autoIp.get());
+  uint32_t netmask = makeMask(prefixLength);
+  uint32_t subnet = ip & netmask;
+  const char* gateway = "0.0.0.0";
+  struct in_addr addr;
+  addr.s_addr = subnet;
+  const char* dst = inet_ntoa(addr);
+
+  mNetUtils->do_ifc_remove_default_route(autoIfname.get());
+  mNetUtils->do_ifc_remove_route(autoIfname.get(), dst, prefixLength, gateway);
+  return true;
+}
+
+bool NetworkUtils::addSecondaryRoute(NetworkParams& aOptions)
+{
+  char command[MAX_COMMAND_SIZE];
+  snprintf(command, MAX_COMMAND_SIZE - 1,
+           "interface route add %s secondary %s %s %s",
+           GET_CHAR(mIfname),
+           GET_CHAR(mIp),
+           GET_CHAR(mPrefix),
+           GET_CHAR(mGateway));
+
+  doCommand(command, nullptr, nullptr);
+  return true;
+}
+
+bool NetworkUtils::removeSecondaryRoute(NetworkParams& aOptions)
+{
+  char command[MAX_COMMAND_SIZE];
+  snprintf(command, MAX_COMMAND_SIZE - 1,
+           "interface route remove %s secondary %s %s %s",
+           GET_CHAR(mIfname),
+           GET_CHAR(mIp),
+           GET_CHAR(mPrefix),
+           GET_CHAR(mGateway));
+
+  doCommand(command, nullptr, nullptr);
+  return true;
+}
+
+bool NetworkUtils::getNetworkInterfaceStats(NetworkParams& aOptions)
+{
+  DEBUG("getNetworkInterfaceStats: %s", GET_CHAR(mIfname));
+  aOptions.mRxBytes = -1;
+  aOptions.mTxBytes = -1;
+
+  RUN_CHAIN(aOptions, sNetworkInterfaceStatsChain, networkInterfaceStatsFail);
+  return  true;
+}
+
+bool NetworkUtils::setNetworkInterfaceAlarm(NetworkParams& aOptions)
+{
+  DEBUG("setNetworkInterfaceAlarms: %s", GET_CHAR(mIfname));
+  RUN_CHAIN(aOptions, sNetworkInterfaceSetAlarmChain, networkInterfaceAlarmFail);
+  return true;
+}
+
+bool NetworkUtils::enableNetworkInterfaceAlarm(NetworkParams& aOptions)
+{
+  DEBUG("enableNetworkInterfaceAlarm: %s", GET_CHAR(mIfname));
+  RUN_CHAIN(aOptions, sNetworkInterfaceEnableAlarmChain, networkInterfaceAlarmFail);
+  return true;
+}
+
+bool NetworkUtils::disableNetworkInterfaceAlarm(NetworkParams& aOptions)
+{
+  DEBUG("disableNetworkInterfaceAlarms: %s", GET_CHAR(mIfname));
+  RUN_CHAIN(aOptions, sNetworkInterfaceDisableAlarmChain, networkInterfaceAlarmFail);
+  return true;
+}
+
+/**
+ * handling main thread's reload Wifi firmware request
+ */
+bool NetworkUtils::setWifiOperationMode(NetworkParams& aOptions)
+{
+  DEBUG("setWifiOperationMode: %s %s", GET_CHAR(mIfname), GET_CHAR(mMode));
+  RUN_CHAIN(aOptions, sWifiOperationModeChain, wifiOperationModeFail);
+  return true;
+}
+
+/**
+ * handling main thread's enable/disable WiFi Tethering request
+ */
+bool NetworkUtils::setWifiTethering(NetworkParams& aOptions)
+{
+  bool enable = aOptions.mEnable;
+  IFProperties interfaceProperties;
+  getIFProperties(GET_CHAR(mExternalIfname), interfaceProperties);
+
+  if (strcmp(interfaceProperties.dns1, "")) {
+    aOptions.mDns1 = NS_ConvertUTF8toUTF16(interfaceProperties.dns1);
+  }
+  if (strcmp(interfaceProperties.dns2, "")) {
+    aOptions.mDns2 = NS_ConvertUTF8toUTF16(interfaceProperties.dns2);
+  }
+  dumpParams(aOptions, "WIFI");
+
+  if (enable) {
+    DEBUG("Starting Wifi Tethering on %s <-> %s",
+           GET_CHAR(mInternalIfname), GET_CHAR(mExternalIfname));
+    RUN_CHAIN(aOptions, sWifiEnableChain, wifiTetheringFail)
+  } else {
+    DEBUG("Stopping Wifi Tethering on %s <-> %s",
+           GET_CHAR(mInternalIfname), GET_CHAR(mExternalIfname));
+    RUN_CHAIN(aOptions, sWifiDisableChain, wifiTetheringFail)
+  }
+  return true;
+}
+
+bool NetworkUtils::setUSBTethering(NetworkParams& aOptions)
+{
+  bool enable = aOptions.mEnable;
+  IFProperties interfaceProperties;
+  getIFProperties(GET_CHAR(mExternalIfname), interfaceProperties);
+
+  if (strcmp(interfaceProperties.dns1, "")) {
+    aOptions.mDns1 = NS_ConvertUTF8toUTF16(interfaceProperties.dns1);
+  }
+  if (strcmp(interfaceProperties.dns2, "")) {
+    aOptions.mDns2 = NS_ConvertUTF8toUTF16(interfaceProperties.dns2);
+  }
+  dumpParams(aOptions, "USB");
+
+  if (enable) {
+    DEBUG("Starting USB Tethering on %s <-> %s",
+           GET_CHAR(mInternalIfname), GET_CHAR(mExternalIfname));
+    RUN_CHAIN(aOptions, sUSBEnableChain, usbTetheringFail)
+  } else {
+    DEBUG("Stopping USB Tethering on %s <-> %s",
+           GET_CHAR(mInternalIfname), GET_CHAR(mExternalIfname));
+    RUN_CHAIN(aOptions, sUSBDisableChain, usbTetheringFail)
+  }
+  return true;
+}
+
+void NetworkUtils::escapeQuote(nsCString& aString)
+{
+  aString.ReplaceSubstring("\\", "\\\\");
+  aString.ReplaceSubstring("\"", "\\\"");
+}
+
+void NetworkUtils::checkUsbRndisState(NetworkParams& aOptions)
+{
+  static uint32_t retry = 0;
+
+  char currentState[PROPERTY_VALUE_MAX];
+  property_get(SYS_USB_STATE_PROPERTY, currentState, nullptr);
+
+  nsTArray<nsCString> stateFuncs;
+  split(currentState, USB_CONFIG_DELIMIT, stateFuncs);
+  bool rndisPresent = stateFuncs.Contains(nsCString(USB_FUNCTION_RNDIS));
+
+  if (aOptions.mEnable == rndisPresent) {
+    NetworkResultOptions result;
+    result.mEnable = aOptions.mEnable;
+    result.mResult = true;
+    postMessage(aOptions, result);
+    retry = 0;
+    return;
+  }
+  if (retry < USB_FUNCTION_RETRY_TIMES) {
+    retry++;
+    usleep(USB_FUNCTION_RETRY_INTERVAL * 1000);
+    checkUsbRndisState(aOptions);
+    return;
+  }
+
+  NetworkResultOptions result;
+  result.mResult = false;
+  postMessage(aOptions, result);
+  retry = 0;
+}
+
+/**
+ * Modify usb function's property to turn on USB RNDIS function
+ */
+bool NetworkUtils::enableUsbRndis(NetworkParams& aOptions)
+{
+  bool report = aOptions.mReport;
+
+  // For some reason, rndis doesn't play well with diag,modem,nmea.
+  // So when turning rndis on, we set sys.usb.config to either "rndis"
+  // or "rndis,adb". When turning rndis off, we go back to
+  // persist.sys.usb.config.
+  //
+  // On the otoro/unagi, persist.sys.usb.config should be one of:
+  //
+  //    diag,modem,nmea,mass_storage
+  //    diag,modem,nmea,mass_storage,adb
+  //
+  // When rndis is enabled, sys.usb.config should be one of:
+  //
+  //    rdnis
+  //    rndis,adb
+  //
+  // and when rndis is disabled, it should revert to persist.sys.usb.config
+
+  char currentConfig[PROPERTY_VALUE_MAX];
+  property_get(SYS_USB_CONFIG_PROPERTY, currentConfig, nullptr);
+
+  nsTArray<nsCString> configFuncs;
+  split(currentConfig, USB_CONFIG_DELIMIT, configFuncs);
+
+  char persistConfig[PROPERTY_VALUE_MAX];
+  property_get(PERSIST_SYS_USB_CONFIG_PROPERTY, persistConfig, nullptr);
+
+  nsTArray<nsCString> persistFuncs;
+  split(persistConfig, USB_CONFIG_DELIMIT, persistFuncs);
+
+  if (aOptions.mEnable) {
+    configFuncs.Clear();
+    configFuncs.AppendElement(nsCString(USB_FUNCTION_RNDIS));
+    if (persistFuncs.Contains(nsCString(USB_FUNCTION_ADB))) {
+      configFuncs.AppendElement(nsCString(USB_FUNCTION_ADB));
+    }
+  } else {
+    // We're turning rndis off, revert back to the persist setting.
+    // adb will already be correct there, so we don't need to do any
+    // further adjustments.
+    configFuncs = persistFuncs;
+  }
+
+  char newConfig[PROPERTY_VALUE_MAX] = "";
+  property_get(SYS_USB_CONFIG_PROPERTY, currentConfig, nullptr);
+  join(configFuncs, USB_CONFIG_DELIMIT, PROPERTY_VALUE_MAX, newConfig);
+  if (strcmp(currentConfig, newConfig)) {
+    property_set(SYS_USB_CONFIG_PROPERTY, newConfig);
+  }
+
+  // Trigger the timer to check usb state and report the result to NetworkManager.
+  if (report) {
+    usleep(USB_FUNCTION_RETRY_INTERVAL * 1000);
+    checkUsbRndisState(aOptions);
+  }
+  return true;
+}
+
+/**
+ * handling upstream interface change event.
+ */
+bool NetworkUtils::updateUpStream(NetworkParams& aOptions)
+{
+  RUN_CHAIN(aOptions, sUpdateUpStreamChain, updateUpStreamFail)
+  return true;
+}
+
+void NetworkUtils::sendBroadcastMessage(uint32_t code, char* reason)
+{
+  NetworkResultOptions result;
+  switch(code) {
+    case NETD_COMMAND_INTERFACE_CHANGE:
+      result.mTopic = NS_ConvertUTF8toUTF16("netd-interface-change");
+      break;
+    case NETD_COMMAND_BANDWIDTH_CONTROLLER:
+      result.mTopic = NS_ConvertUTF8toUTF16("netd-bandwidth-control");
+      break;
+    default:
+      return;
+  }
+
+  result.mBroadcast = true;
+  result.mReason = NS_ConvertUTF8toUTF16(reason);
+  postMessage(result);
+}
+
+inline uint32_t NetworkUtils::netdResponseType(uint32_t code)
+{
+  return (code / 100) * 100;
+}
+
+inline bool NetworkUtils::isBroadcastMessage(uint32_t code)
+{
+  uint32_t type = netdResponseType(code);
+  return type == NETD_COMMAND_UNSOLICITED;
+}
+
+inline bool NetworkUtils::isError(uint32_t code)
+{
+  uint32_t type = netdResponseType(code);
+  return type != NETD_COMMAND_PROCEEDING && type != NETD_COMMAND_OKAY;
+}
+
+inline bool NetworkUtils::isComplete(uint32_t code)
+{
+  uint32_t type = netdResponseType(code);
+  return type != NETD_COMMAND_PROCEEDING;
+}
+
+inline bool NetworkUtils::isProceeding(uint32_t code)
+{
+  uint32_t type = netdResponseType(code);
+  return type == NETD_COMMAND_PROCEEDING;
+}
+
+void NetworkUtils::dumpParams(NetworkParams& aOptions, const char* aType)
+{
+#ifdef _DEBUG
+  DEBUG("Dump params:");
+  DEBUG("     ifname: %s", GET_CHAR(mIfname));
+  DEBUG("     ip: %s", GET_CHAR(mIp));
+  DEBUG("     link: %s", GET_CHAR(mLink));
+  DEBUG("     prefix: %s", GET_CHAR(mPrefix));
+  DEBUG("     wifiStartIp: %s", GET_CHAR(mWifiStartIp));
+  DEBUG("     wifiEndIp: %s", GET_CHAR(mWifiEndIp));
+  DEBUG("     usbStartIp: %s", GET_CHAR(mUsbStartIp));
+  DEBUG("     usbEndIp: %s", GET_CHAR(mUsbEndIp));
+  DEBUG("     dnsserver1: %s", GET_CHAR(mDns1));
+  DEBUG("     dnsserver2: %s", GET_CHAR(mDns2));
+  DEBUG("     internalIfname: %s", GET_CHAR(mInternalIfname));
+  DEBUG("     externalIfname: %s", GET_CHAR(mExternalIfname));
+  if (!strcmp(aType, "WIFI")) {
+    DEBUG("     wifictrlinterfacename: %s", GET_CHAR(mWifictrlinterfacename));
+    DEBUG("     ssid: %s", GET_CHAR(mSsid));
+    DEBUG("     security: %s", GET_CHAR(mSecurity));
+    DEBUG("     key: %s", GET_CHAR(mKey));
+  }
+#endif
+}
+
+#undef GET_CHAR
+#undef GET_FIELD