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/*
* 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 RTC_BASE_NAT_TYPES_H_
#define RTC_BASE_NAT_TYPES_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 // RTC_BASE_NAT_TYPES_H_
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