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 <assert.h>
12
13#include "webrtc/base/nattypes.h"
14
15namespace rtc {
16
17class SymmetricNAT : public NAT {
18public:
19  bool IsSymmetric() { return true; }
20  bool FiltersIP() { return true; }
21  bool FiltersPort() { return true; }
22};
23
24class OpenConeNAT : public NAT {
25public:
26  bool IsSymmetric() { return false; }
27  bool FiltersIP() { return false; }
28  bool FiltersPort() { return false; }
29};
30
31class AddressRestrictedNAT : public NAT {
32public:
33  bool IsSymmetric() { return false; }
34  bool FiltersIP() { return true; }
35  bool FiltersPort() { return false; }
36};
37
38class PortRestrictedNAT : public NAT {
39public:
40  bool IsSymmetric() { return false; }
41  bool FiltersIP() { return true; }
42  bool FiltersPort() { return true; }
43};
44
45NAT* NAT::Create(NATType type) {
46  switch (type) {
47  case NAT_OPEN_CONE:       return new OpenConeNAT();
48  case NAT_ADDR_RESTRICTED: return new AddressRestrictedNAT();
49  case NAT_PORT_RESTRICTED: return new PortRestrictedNAT();
50  case NAT_SYMMETRIC:       return new SymmetricNAT();
51  default: assert(0);       return 0;
52  }
53}
54
55} // namespace rtc
56