102 lines
3.4 KiB
C++
102 lines
3.4 KiB
C++
|
/**********
|
||
|
|
This library is free software; you can redistribute it and/or modify it under
|
||
|
|
the terms of the GNU Lesser General Public License as published by the
|
||
|
|
Free Software Foundation; either version 2.1 of the License, or (at your
|
||
|
|
option) any later version. (See <http://www.gnu.org/copyleft/lesser.html>.)
|
||
|
|
|
||
|
|
This library is distributed in the hope that it will be useful, but WITHOUT
|
||
|
|
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
|
||
|
|
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
|
||
|
|
more details.
|
||
|
|
|
||
|
|
You should have received a copy of the GNU Lesser General Public License
|
||
|
|
along with this library; if not, write to the Free Software Foundation, Inc.,
|
||
|
|
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
||
|
|
**********/
|
||
|
|
// "mTunnel" multicast access service
|
||
|
|
// Copyright (c) 1996-2015 Live Networks, Inc. All rights reserved.
|
||
|
|
// Encapsulation trailer for tunnels
|
||
|
|
// C++ header
|
||
|
|
|
||
|
|
#ifndef _TUNNEL_ENCAPS_HH
|
||
|
|
#define _TUNNEL_ENCAPS_HH
|
||
|
|
|
||
|
|
#ifndef _NET_ADDRESS_HH
|
||
|
|
#include "NetAddress.hh"
|
||
|
|
#endif
|
||
|
|
|
||
|
|
typedef u_int16_t Cookie;
|
||
|
|
|
||
|
|
class TunnelEncapsulationTrailer {
|
||
|
|
// The trailer is layed out as follows:
|
||
|
|
// bytes 0-1: source 'cookie'
|
||
|
|
// bytes 2-3: destination 'cookie'
|
||
|
|
// bytes 4-7: address
|
||
|
|
// bytes 8-9: port
|
||
|
|
// byte 10: ttl
|
||
|
|
// byte 11: command
|
||
|
|
|
||
|
|
// Optionally, there may also be a 4-byte 'auxilliary address'
|
||
|
|
// (e.g., for 'source-specific multicast' preceding this)
|
||
|
|
// bytes -4 through -1: auxilliary address
|
||
|
|
|
||
|
|
public:
|
||
|
|
Cookie& srcCookie()
|
||
|
|
{ return *(Cookie*)byteOffset(0); }
|
||
|
|
Cookie& dstCookie()
|
||
|
|
{ return *(Cookie*)byteOffset(2); }
|
||
|
|
u_int32_t& address()
|
||
|
|
{ return *(u_int32_t*)byteOffset(4); }
|
||
|
|
Port& port()
|
||
|
|
{ return *(Port*)byteOffset(8); }
|
||
|
|
u_int8_t& ttl()
|
||
|
|
{ return *(u_int8_t*)byteOffset(10); }
|
||
|
|
u_int8_t& command()
|
||
|
|
{ return *(u_int8_t*)byteOffset(11); }
|
||
|
|
|
||
|
|
u_int32_t& auxAddress()
|
||
|
|
{ return *(u_int32_t*)byteOffset(-4); }
|
||
|
|
|
||
|
|
private:
|
||
|
|
inline char* byteOffset(int charIndex)
|
||
|
|
{ return ((char*)this) + charIndex; }
|
||
|
|
};
|
||
|
|
|
||
|
|
const unsigned TunnelEncapsulationTrailerSize = 12; // bytes
|
||
|
|
const unsigned TunnelEncapsulationTrailerAuxSize = 4; // bytes
|
||
|
|
const unsigned TunnelEncapsulationTrailerMaxSize
|
||
|
|
= TunnelEncapsulationTrailerSize + TunnelEncapsulationTrailerAuxSize;
|
||
|
|
|
||
|
|
// Command codes:
|
||
|
|
// 0: unused
|
||
|
|
const u_int8_t TunnelDataCmd = 1;
|
||
|
|
const u_int8_t TunnelJoinGroupCmd = 2;
|
||
|
|
const u_int8_t TunnelLeaveGroupCmd = 3;
|
||
|
|
const u_int8_t TunnelTearDownCmd = 4;
|
||
|
|
const u_int8_t TunnelProbeCmd = 5;
|
||
|
|
const u_int8_t TunnelProbeAckCmd = 6;
|
||
|
|
const u_int8_t TunnelProbeNackCmd = 7;
|
||
|
|
const u_int8_t TunnelJoinRTPGroupCmd = 8;
|
||
|
|
const u_int8_t TunnelLeaveRTPGroupCmd = 9;
|
||
|
|
// 0x0A through 0x10: currently unused.
|
||
|
|
const u_int8_t TunnelExtensionFlag = 0x80; // a flag, not a cmd code
|
||
|
|
const u_int8_t TunnelDataAuxCmd
|
||
|
|
= (TunnelExtensionFlag|TunnelDataCmd);
|
||
|
|
const u_int8_t TunnelJoinGroupAuxCmd
|
||
|
|
= (TunnelExtensionFlag|TunnelJoinGroupCmd);
|
||
|
|
const u_int8_t TunnelLeaveGroupAuxCmd
|
||
|
|
= (TunnelExtensionFlag|TunnelLeaveGroupCmd);
|
||
|
|
// Note: the TearDown, Probe, ProbeAck, ProbeNack cmds have no Aux version
|
||
|
|
// 0x84 through 0x87: currently unused.
|
||
|
|
const u_int8_t TunnelJoinRTPGroupAuxCmd
|
||
|
|
= (TunnelExtensionFlag|TunnelJoinRTPGroupCmd);
|
||
|
|
const u_int8_t TunnelLeaveRTPGroupAuxCmd
|
||
|
|
= (TunnelExtensionFlag|TunnelLeaveRTPGroupCmd);
|
||
|
|
// 0x8A through 0xFF: currently unused
|
||
|
|
|
||
|
|
inline Boolean TunnelIsAuxCmd(u_int8_t cmd) {
|
||
|
|
return (cmd&TunnelExtensionFlag) != 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif
|