RPGM data structures

Packet format

=========================================
| 	-------------------------	|
| IP	| PGM			|	|
|	-------------------------	|
=========================================

IP Protocol Number : 113

IP : Network Layer
PGM : Transport Layer

PGM packets

MCast
	SPM
	ODATA
	RDATA
	NCF
UCast
	NAK

PGM headers

Generic Header : rpgm_hdr.h

Data Source Port (16)
Data Destination POrt (16)
Type (8)
OPtions (8)
Checksum (16)
Global Src ID (GSI) (48)
Transport Service Data Unit Length (TSDU) (16)

SPM Header : rpgm_spm_hdr.h

Generic Header
SPM Seq Num (32)
Trailing Edge Seq. Num (32)
Leading Edge Seq. Num (32)
NLA AFI (16)
?? Reserved (16)
Path NLA (??)
?? Optional Extensions when present (??)

Data Header : rpm_data_hdr.h

Generic Header
Data Packet Seq Num (32)
Trailing Edge Sequ Num (32)
?? Optional Extensions (??)
?? Data (??)

NAK/NCF : rpgm_neg_hdr.h

Generic Header
Requested Seq. No (32)
NLA AFI (16)
Reserved (16)
Source NLA (?)
NLA AFI (16)
Reserved (16)
Multicast Group NLA (??)
??Optional Extension when present (??)

PGM Packet types : rpgm_types.h

#DEFINE TYPE_SPM   0x00 /* 0 */
#DEFINE TYPE_ODATA 0x04 /* 4 */
#DEFINE TYPE_RDATA 0x05 /* 5 */
#DEFINE TYPE_NAK   0x08 /* 8 */
#DEFINE TYPE_NNAK  0x09 /* 9 */
#DEFINE TYPE_NCF   0x0A /* 10 */