Support adding/removing IPv4 and IPv6 addresses on interfaces

Bug: 30298058
Change-Id: Ic25cd165476d1a781595460b7d764e8df4707c65
diff --git a/server/InterfaceController.h b/server/InterfaceController.h
index 4c8057e..356cc5a 100644
--- a/server/InterfaceController.h
+++ b/server/InterfaceController.h
@@ -27,6 +27,8 @@
     static int setIPv6PrivacyExtensions(const char *interface, const int on);
     static int setIPv6NdOffload(char* interface, const int on);
     static int setMtu(const char *interface, const char *mtu);
+    static int addAddress(const char *interface, const char *addrString, int prefixLength);
+    static int delAddress(const char *interface, const char *addrString, int prefixLength);
 
 private:
     static void setAcceptRA(const char* value);