MODULE SCTPDEF IDENT "SCTPDEF-1-X";
/*++
/*
/* Facility:	Stream Control Transmission Protocol (SCTP) 
/*      
/*
/* Abstract:	Request for Comments: 2960
/*
/* Author:	Ruslan R. Laishev
/*
/* Creation Date: 03-NOV-2009
/*
/* Modification History:
/*
/*--

AGGREGATE	tlv	STRUCTURE PREFIX sctp$ TAG sctp NOALIGN;
	tag	WORD UNSIGNED;
	len	WORD UNSIGNED;
	val	UNION;
		val	BYTE UNSIGNED DIMENSION 1;
		val	WORD UNSIGNED DIMENSION 1;
		val	LONGWORD UNSIGNED DIMENSION 1;
	END	val;

END	tlv;


/*
/* SCTP connection states
/*
CONSTANT	(
	closed,
	cwait,
	cechoed,
	estab,
	shutpnd,
	shutrcvd,
	shutsent,
	shutacked
	) EQUALS 1 INCREMENT 0 PREFIX sctp$ TAG state;

/*
/* SCTP chunk types
/*
CONSTANT	(
	data,
	init,
	initack,
	sack,
	hbeat,
	hbeatack,
	abort,
	shut,
	shutack,
	error,
	cecho,
	cack,
	ecne,
	cwr,
	shuted
	) EQUALS 0 INCREMENT 1 PREFIX sctp$ TAG type;


AGGREGATE	hdr	STRUCTURE PREFIX sctp$ TAG sctp NOALIGN;
	type	BYTE UNSIGNED;	/* See SCTP$TYPE* constant
	flags	BYTE UNSIGNED;
	len	WORD UNSIGNED;

	CONSTANT	sz EQUALS .;	

	data	BYTE UNSIGNED DIMENSION 1;
END	hdr;
/*
/* SCTP Packet structure
/*
AGGREGATE	pkt	STRUCTURE PREFIX sctp$ TAG sctp NOALIGN;
	spn	WORD UNSIGNED;
	dpn	WORD UNSIGNED;

	vtag	LONGWORD UNSIGNED;

	csum	LONGWORD UNSIGNED;

	CONSTANT	sz EQUALS .;	

	data	sctp_hdr DIMENSION 1;
END	pkt;

/*
/*	Payload Data (DATA) (0)
/*
AGGREGATE	data	STRUCTURE PREFIX chunk$ TAG sctp NOALIGN;
	CONSTANT	(
		middle,				/* Middle piece of a fragmented user message
		last,				/* Last piece of a fragmented user message
		first,				/* First piece of a fragmented user message
		unfrag				/* Unfragmented Message
	) EQUALS 0 INCREMENT 1 PREFIX data$ TAG fata;

	tsn	LONGWORD UNSIGNED;

	stream	WORD UNSIGNED;			/* Stream Identifier S
	seq	WORD UNSIGNED;			/* Stream Sequence Number n
	proto	LONGWORD UNSIGNED;		/* Payload Protocol Identifier

	CONSTANT	sz EQUALS .;	

	data	BYTE UNSIGNED DIMENSION 1;	/* User Data (seq n of Stream S)
END	data;
/*
/*	Initiation (INIT) (1)
/*	Initiation Acknowledgement (INIT ACK) (2)
/*
AGGREGATE	init	STRUCTURE PREFIX chunk$ TAG sctp NOALIGN;
	initag	LONGWORD UNSIGNED;
	a_rwnd	LONGWORD UNSIGNED;
	os	WORD UNSIGNED;
	mis	WORD UNSIGNED;
	itsn	LONGWORD UNSIGNED;
	opts	sctp_tlv;
END	init;

/*
/*	Selective Acknowledgement (SACK) (3)
/*
AGGREGATE	gap	STRUCTURE PREFIX chunk$ TAG sctp NOALIGN;
	bstart	WORD UNSIGNED;
	bend	WORD UNSIGNED;
END	gap;

AGGREGATE	sack	STRUCTURE PREFIX chunk$ TAG sctp NOALIGN;
	tsn	LONGWORD UNSIGNED;
	a_rwnd	LONGWORD UNSIGNED;
	nack	WORD UNSIGNED;
	ndup	WORD UNSIGNED;

	gap	sctp_gap DIMENSION 1;
END	sack;
/*
/*	Heartbeat Request (HEARTBEAT) (4)
/*	Heartbeat Acknowledgement (HEARTBEAT ACK) (5)
/*
AGGREGATE	heartbeat	STRUCTURE PREFIX chunk$ TAG sctp NOALIGN;
	opts	sctp_tlv;
END	heartbeat;

/*
/*	Abort Association (ABORT) (6)
/*
AGGREGATE	abort	STRUCTURE PREFIX chunk$ TAG sctp NOALIGN;
	errs	 sctp_tlv;	
END	abort;

/*
/*	Shutdown Association (SHUTDOWN) (7)
/*	Shutdown Acknowledgement (SHUTDOWN ACK) (8) - no TSN
/*	Shutdown Complete (SHUTDOWN COMPLETE) (14) - no TSN
/*
AGGREGATE	shut	STRUCTURE PREFIX chunk$ TAG sctp NOALIGN;
	tsn	LONGWORD UNSIGNED ;
END	shut;
/*
/*	Operation Error (ERROR) (9)
/*
AGGREGATE	err	STRUCTURE PREFIX chunk$ TAG sctp NOALIGN;
	errs	sctp_tlv;
END	err;
/*
/*	Cookie Echo (COOKIE ECHO) (10)
/*	Cookie Acknowledgement (COOKIE ACK) (11) - no Cookie
/*
AGGREGATE	echo	STRUCTURE PREFIX chunk$ TAG sctp NOALIGN;
	cookie	sctp_tlv;
END	echo;

END_MODULE	SCTPDEF;