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/*
* pgm.h
* Copyright (C) 2001 by the University of Southern California
* $Id: pgm.h,v 1.3 2005/08/25 18:58:10 johnh Exp $
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
*
*
* The copyright of this module includes the following
* linking-with-specific-other-licenses addition:
*
* In addition, as a special exception, the copyright holders of
* this module give you permission to combine (via static or
* dynamic linking) this module with free software programs or
* libraries that are released under the GNU LGPL and with code
* included in the standard release of ns-2 under the Apache 2.0
* license or under otherwise-compatible licenses with advertising
* requirements (or modified versions of such code, with unchanged
* license). You may copy and distribute such a system following the
* terms of the GNU GPL for this module and the licenses of the
* other code concerned, provided that you include the source code of
* that other code when and as the GNU GPL requires distribution of
* source code.
*
* Note that people who make modified versions of this module
* are not obligated to grant this special exception for their
* modified versions; it is their choice whether to do so. The GNU
* General Public License gives permission to release a modified
* version without this exception; this exception also makes it
* possible to release a modified version which carries forward this
* exception.
*
*/
/*
* Pragmatic General Multicast (PGM), Reliable Multicast
*
* pgm.h
*
* This holds the packet header structures, and packet type constants for
* the PGM implementation.
*
* Ryan S. Barnett, 2001
* rbarnett@catarina.usc.edu
*/
#ifndef PGM_H
#define PGM_H
/*
* Types for PT_PGM packets.
*/
#define PGM_SPM 0x00
#define PGM_ODATA 0x04
#define PGM_RDATA 0x05
#define PGM_NAK 0x08
#define PGM_NCF 0x0A
// ************************************************************
// Header included with all PGM packets.
// ************************************************************
struct hdr_pgm {
int type_; // PGM sub-type.
ns_addr_t tsi_; // The transport session ID (source addr and source port).
// The sequence number for this PGM packet. It can have differing meaning
// depending on whether the packet is SPM, ODATA, RDATA, NAK, or NCF.
int seqno_;
static int offset_; // Used to locate this packet header.
inline static int& offset() { return offset_; }
inline static hdr_pgm* access(const Packet *p) {
return (hdr_pgm *)p->access(offset_);
}
};
// ************************************************************
// Header included with PGM SPM-type packets.
// ************************************************************
struct hdr_pgm_spm {
ns_addr_t spm_path_; // Address of upstream PGM node.
static int offset_; // Used to locate this packet header.
inline static int& offset() { return offset_; }
inline static hdr_pgm_spm* access(const Packet *p) {
return (hdr_pgm_spm *)p->access(offset_);
}
};
// ************************************************************
// Header included with PGM NAK-type packets.
// ************************************************************
struct hdr_pgm_nak {
ns_addr_t source_; // Address of ODATA source.
ns_addr_t group_; // Address for the multicast group.
static int offset_; // Used to locate this packet header.
inline static int& offset() { return offset_; }
inline static hdr_pgm_nak* access(const Packet *p) {
return (hdr_pgm_nak *)p->access(offset_);
}
};
// Quick reference macros to access the packet headers.
#define HDR_PGM(p) (hdr_pgm::access(p))
#define HDR_PGM_SPM(p) (hdr_pgm_spm::access(p))
#define HDR_PGM_NAK(p) (hdr_pgm_nak::access(p))
#endif // PGM_H
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