netd: NetlinkManager: add support receiving quota2 log messages

NetlinkManager, NetlinkHandler
 . added support for netlink's NETLINK_NFLOG family used by the updated xt_quota2.
 . it pushes the event all the wait to NetworkManagementService.java
    "linit alert <alert_name> <iface_name>"

This needs:
 - new kernel with quota2 changes that support logging via NETLINK's
   NETLINK_NFLOG family.
 - BandwidthController changes that setup the alerts.
 - system core NetlinkEvent that recognizes the NFLOG messages.
 - java land NetworkManagementService changes.

Change-Id: Id5b1026c6002803b5a1c0c7623cf7b1961de9802
diff --git a/NetlinkManager.h b/NetlinkManager.h
index ff646f4..c8f5507 100644
--- a/NetlinkManager.h
+++ b/NetlinkManager.h
@@ -20,6 +20,7 @@
 #include <sysutils/SocketListener.h>
 #include <sysutils/NetlinkListener.h>
 
+
 class NetlinkHandler;
 
 class NetlinkManager {
@@ -30,8 +31,10 @@
     SocketListener       *mBroadcaster;
     NetlinkHandler       *mUeventHandler;
     NetlinkHandler       *mRouteHandler;
+    NetlinkHandler       *mQuotaHandler;
     int                  mUeventSock;
     int                  mRouteSock;
+    int                  mQuotaSock;
 
 public:
     virtual ~NetlinkManager();
@@ -44,9 +47,12 @@
 
     static NetlinkManager *Instance();
 
+    /* This is the nflog group arg that the xt_quota2 neftiler will use. */
+    static const int NFLOG_QUOTA_GROUP;
+
 private:
     NetlinkManager();
-    NetlinkHandler* setupSocket(int *sock, int socketType, int groups,
+    NetlinkHandler* setupSocket(int *sock, int netlinkFamily, int groups,
         int format);
 };
 #endif