| /* |
| * Copyright 2004 The WebRTC Project Authors. All rights reserved. |
| * |
| * Use of this source code is governed by a BSD-style license |
| * that can be found in the LICENSE file in the root of the source |
| * tree. An additional intellectual property rights grant can be found |
| * in the file PATENTS. All contributing project authors may |
| * be found in the AUTHORS file in the root of the source tree. |
| */ |
| |
| #ifndef WEBRTC_BASE_NATTYPE_H__ |
| #define WEBRTC_BASE_NATTYPE_H__ |
| |
| namespace rtc { |
| |
| /* Identifies each type of NAT that can be simulated. */ |
| enum NATType { |
| NAT_OPEN_CONE, |
| NAT_ADDR_RESTRICTED, |
| NAT_PORT_RESTRICTED, |
| NAT_SYMMETRIC |
| }; |
| |
| // Implements the rules for each specific type of NAT. |
| class NAT { |
| public: |
| virtual ~NAT() { } |
| |
| // Determines whether this NAT uses both source and destination address when |
| // checking whether a mapping already exists. |
| virtual bool IsSymmetric() = 0; |
| |
| // Determines whether this NAT drops packets received from a different IP |
| // the one last sent to. |
| virtual bool FiltersIP() = 0; |
| |
| // Determines whether this NAT drops packets received from a different port |
| // the one last sent to. |
| virtual bool FiltersPort() = 0; |
| |
| // Returns an implementation of the given type of NAT. |
| static NAT* Create(NATType type); |
| }; |
| |
| } // namespace rtc |
| |
| #endif // WEBRTC_BASE_NATTYPE_H__ |