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diff --git a/third_party/libjingle/files/talk/base/natserver.h b/third_party/libjingle/files/talk/base/natserver.h
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+/*
+ * libjingle
+ * Copyright 2004--2005, Google Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without 
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  1. Redistributions of source code must retain the above copyright notice, 
+ *     this list of conditions and the following disclaimer.
+ *  2. Redistributions in binary form must reproduce the above copyright notice,
+ *     this list of conditions and the following disclaimer in the documentation
+ *     and/or other materials provided with the distribution.
+ *  3. The name of the author may not be used to endorse or promote products 
+ *     derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef TALK_BASE_NATSERVER_H__
+#define TALK_BASE_NATSERVER_H__
+
+#include "talk/base/asyncudpsocket.h"
+#include "talk/base/socketaddresspair.h"
+#include "talk/base/thread.h"
+#include "talk/base/socketfactory.h"
+#include "talk/base/nattypes.h"
+#include <map>
+
+namespace talk_base {
+
+// Change how routes (socketaddress pairs) are compared based on the type of
+// NAT.  The NAT server maintains a hashtable of the routes that it knows
+// about.  So these affect which routes are treated the same.
+struct RouteCmp {
+  RouteCmp(NAT* nat);
+  size_t operator()(const SocketAddressPair& r) const;
+  bool operator()(
+      const SocketAddressPair& r1, const SocketAddressPair& r2) const;
+
+  bool symmetric;
+};
+
+// Changes how addresses are compared based on the filtering rules of the NAT.
+struct AddrCmp {
+  AddrCmp(NAT* nat);
+  size_t operator()(const SocketAddress& r) const;
+  bool operator()(const SocketAddress& r1, const SocketAddress& r2) const;
+
+  bool use_ip;
+  bool use_port;
+};
+
+// Implements the NAT device.  It listens for packets on the internal network,
+// translates them, and sends them out over the external network.
+
+const int NAT_SERVER_PORT = 4237;
+
+class NATServer : public sigslot::has_slots<> {
+public:
+  NATServer(
+      NATType type, SocketFactory* internal, const SocketAddress& internal_addr,
+      SocketFactory* external, const SocketAddress& external_ip);
+  ~NATServer();
+
+  // Packets received on one of the networks.
+  void OnInternalPacket(
+      const char* buf, size_t size, const SocketAddress& addr,
+      AsyncPacketSocket* socket);
+  void OnExternalPacket(
+      const char* buf, size_t size, const SocketAddress& remote_addr,
+      AsyncPacketSocket* socket);
+
+private:
+  typedef std::set<SocketAddress,AddrCmp> AddressSet;
+
+  /* Records a translation and the associated external socket. */
+  struct TransEntry {
+    TransEntry(const SocketAddressPair& r, AsyncUDPSocket* s, NAT* nat);
+    ~TransEntry();
+
+    SocketAddressPair route;
+    AsyncUDPSocket* socket;
+    AddressSet* whitelist;
+  };
+
+  typedef std::map<SocketAddressPair,TransEntry*,RouteCmp> InternalMap;
+  typedef std::map<SocketAddress,TransEntry*> ExternalMap;
+
+  NAT* nat_;
+  AsyncUDPSocket* server_socket_;
+  SocketFactory* external_;
+  SocketAddress external_ip_;
+  InternalMap* int_map_;
+  ExternalMap* ext_map_;
+
+  /* Creates a new entry that translates the given route. */
+  void Translate(const SocketAddressPair& route);
+
+  /* Determines whether the NAT would filter out a packet from this address. */
+  bool Filter(TransEntry* entry, const SocketAddress& ext_addr);
+};
+
+} // namespace talk_base
+
+#endif // TALK_BASE_NATSERVER_H__