1 /* 2 * Copyright 2004 The WebRTC Project Authors. All rights reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #include "rtc_base/nat_types.h" 12 13 #include "rtc_base/checks.h" 14 15 namespace rtc { 16 17 class SymmetricNAT : public NAT { 18 public: IsSymmetric()19 bool IsSymmetric() override { return true; } FiltersIP()20 bool FiltersIP() override { return true; } FiltersPort()21 bool FiltersPort() override { return true; } 22 }; 23 24 class OpenConeNAT : public NAT { 25 public: IsSymmetric()26 bool IsSymmetric() override { return false; } FiltersIP()27 bool FiltersIP() override { return false; } FiltersPort()28 bool FiltersPort() override { return false; } 29 }; 30 31 class AddressRestrictedNAT : public NAT { 32 public: IsSymmetric()33 bool IsSymmetric() override { return false; } FiltersIP()34 bool FiltersIP() override { return true; } FiltersPort()35 bool FiltersPort() override { return false; } 36 }; 37 38 class PortRestrictedNAT : public NAT { 39 public: IsSymmetric()40 bool IsSymmetric() override { return false; } FiltersIP()41 bool FiltersIP() override { return true; } FiltersPort()42 bool FiltersPort() override { return true; } 43 }; 44 Create(NATType type)45NAT* NAT::Create(NATType type) { 46 switch (type) { 47 case NAT_OPEN_CONE: 48 return new OpenConeNAT(); 49 case NAT_ADDR_RESTRICTED: 50 return new AddressRestrictedNAT(); 51 case NAT_PORT_RESTRICTED: 52 return new PortRestrictedNAT(); 53 case NAT_SYMMETRIC: 54 return new SymmetricNAT(); 55 default: 56 RTC_DCHECK_NOTREACHED(); 57 return 0; 58 } 59 } 60 61 } // namespace rtc 62