sctp.h

Axis 221 camera embedded programing interface

	__u8 body[0];
} __attribute__((packed)) sctp_cookie_param_t;

/* Section 3.3.3.1 Unrecognized Parameters (8) */
typedef struct sctp_unrecognized_param {
	sctp_paramhdr_t param_hdr;
	sctp_paramhdr_t unrecognized;
} __attribute__((packed)) sctp_unrecognized_param_t;



/*
 * 3.3.4 Selective Acknowledgement (SACK) (3):
 *
 *  This chunk is sent to the peer endpoint to acknowledge received DATA
 *  chunks and to inform the peer endpoint of gaps in the received
 *  subsequences of DATA chunks as represented by their TSNs.
 */

typedef struct sctp_gap_ack_block {
	__be16 start;
	__be16 end;
} __attribute__((packed)) sctp_gap_ack_block_t;

typedef __be32 sctp_dup_tsn_t;

typedef union {
	sctp_gap_ack_block_t	gab;
        sctp_dup_tsn_t		dup;
} sctp_sack_variable_t;

typedef struct sctp_sackhdr {
	__be32 cum_tsn_ack;
	__be32 a_rwnd;
	__be16 num_gap_ack_blocks;
	__be16 num_dup_tsns;
	sctp_sack_variable_t variable[0];
} __attribute__((packed)) sctp_sackhdr_t;

typedef struct sctp_sack_chunk {
	sctp_chunkhdr_t chunk_hdr;
	sctp_sackhdr_t sack_hdr;
} __attribute__((packed)) sctp_sack_chunk_t;


/* RFC 2960.  Section 3.3.5 Heartbeat Request (HEARTBEAT) (4):
 *
 *  An endpoint should send this chunk to its peer endpoint to probe the
 *  reachability of a particular destination transport address defined in
 *  the present association.
 */

typedef struct sctp_heartbeathdr {
	sctp_paramhdr_t info;
} __attribute__((packed)) sctp_heartbeathdr_t;

typedef struct sctp_heartbeat_chunk {
	sctp_chunkhdr_t chunk_hdr;
	sctp_heartbeathdr_t hb_hdr;
} __attribute__((packed)) sctp_heartbeat_chunk_t;


/* For the abort and shutdown ACK we must carry the init tag in the
 * common header. Just the common header is all that is needed with a
 * chunk descriptor.
 */
typedef struct sctp_abort_chunk {
        sctp_chunkhdr_t uh;
} __attribute__((packed)) sctp_abort_chunk_t;


/* For the graceful shutdown we must carry the tag (in common header)
 * and the highest consecutive acking value.
 */
typedef struct sctp_shutdownhdr {
	__be32 cum_tsn_ack;
} __attribute__((packed)) sctp_shutdownhdr_t;

struct sctp_shutdown_chunk_t {
        sctp_chunkhdr_t    chunk_hdr;
        sctp_shutdownhdr_t shutdown_hdr;
} __attribute__ ((packed));

/* RFC 2960.  Section 3.3.10 Operation Error (ERROR) (9) */

typedef struct sctp_errhdr {
	__be16 cause;
	__be16 length;
	__u8  variable[0];
} __attribute__((packed)) sctp_errhdr_t;

typedef struct sctp_operr_chunk {
        sctp_chunkhdr_t chunk_hdr;
	sctp_errhdr_t   err_hdr;
} __attribute__((packed)) sctp_operr_chunk_t;

/* RFC 2960 3.3.10 - Operation Error
 *
 * Cause Code: 16 bits (unsigned integer)
 *
 *     Defines the type of error conditions being reported.
 *    Cause Code
 *     Value           Cause Code
 *     ---------      ----------------
 *      1              Invalid Stream Identifier
 *      2              Missing Mandatory Parameter
 *      3              Stale Cookie Error
 *      4              Out of Resource
 *      5              Unresolvable Address
 *      6              Unrecognized Chunk Type
 *      7              Invalid Mandatory Parameter
 *      8              Unrecognized Parameters
 *      9              No User Data
 *     10              Cookie Received While Shutting Down
 */
typedef enum {

	SCTP_ERROR_NO_ERROR	   = __constant_htons(0x00),
	SCTP_ERROR_INV_STRM	   = __constant_htons(0x01),
	SCTP_ERROR_MISS_PARAM 	   = __constant_htons(0x02),
	SCTP_ERROR_STALE_COOKIE	   = __constant_htons(0x03),
	SCTP_ERROR_NO_RESOURCE 	   = __constant_htons(0x04),
	SCTP_ERROR_DNS_FAILED      = __constant_htons(0x05),
	SCTP_ERROR_UNKNOWN_CHUNK   = __constant_htons(0x06),
	SCTP_ERROR_INV_PARAM       = __constant_htons(0x07),
	SCTP_ERROR_UNKNOWN_PARAM   = __constant_htons(0x08),
	SCTP_ERROR_NO_DATA         = __constant_htons(0x09),
	SCTP_ERROR_COOKIE_IN_SHUTDOWN = __constant_htons(0x0a),


	/* SCTP Implementation Guide:
	 *  11  Restart of an association with new addresses
	 *  12  User Initiated Abort
	 *  13  Protocol Violation
	 */

	SCTP_ERROR_RESTART         = __constant_htons(0x0b),
	SCTP_ERROR_USER_ABORT      = __constant_htons(0x0c),
	SCTP_ERROR_PROTO_VIOLATION = __constant_htons(0x0d),

	/* ADDIP Section 3.3  New Error Causes
	 *
	 * Four new Error Causes are added to the SCTP Operational Errors,
	 * primarily for use in the ASCONF-ACK chunk.
	 *
	 * Value          Cause Code
	 * ---------      ----------------
	 * 0x0100          Request to Delete Last Remaining IP Address.
	 * 0x0101          Operation Refused Due to Resource Shortage.
	 * 0x0102          Request to Delete Source IP Address.
	 * 0x0103          Association Aborted due to illegal ASCONF-ACK
	 * 0x0104          Request refused - no authorization.
	 */
	SCTP_ERROR_DEL_LAST_IP	= __constant_htons(0x0100),
	SCTP_ERROR_RSRC_LOW	= __constant_htons(0x0101),
	SCTP_ERROR_DEL_SRC_IP	= __constant_htons(0x0102),
	SCTP_ERROR_ASCONF_ACK   = __constant_htons(0x0103),
	SCTP_ERROR_REQ_REFUSED	= __constant_htons(0x0104)
} sctp_error_t;



/* RFC 2960.  Appendix A.  Explicit Congestion Notification.
 *   Explicit Congestion Notification Echo (ECNE) (12)
 */
typedef struct sctp_ecnehdr {
	__be32 lowest_tsn;
} sctp_ecnehdr_t;

typedef struct sctp_ecne_chunk {
	sctp_chunkhdr_t chunk_hdr;
	sctp_ecnehdr_t ence_hdr;
} __attribute__((packed)) sctp_ecne_chunk_t;

/* RFC 2960.  Appendix A.  Explicit Congestion Notification.
 *   Congestion Window Reduced (CWR) (13)
 */
typedef struct sctp_cwrhdr {
	__be32 lowest_tsn;
} sctp_cwrhdr_t;

typedef struct sctp_cwr_chunk {
	sctp_chunkhdr_t chunk_hdr;
	sctp_cwrhdr_t cwr_hdr;
} __attribute__((packed)) sctp_cwr_chunk_t;

/* PR-SCTP
 * 3.2 Forward Cumulative TSN Chunk Definition (FORWARD TSN)
 *
 * Forward Cumulative TSN chunk has the following format:
 *
 *        0                   1                   2                   3
 *        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 *      |   Type = 192  |  Flags = 0x00 |        Length = Variable      |
 *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 *      |                      New Cumulative TSN                       |
 *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 *      |         Stream-1              |       Stream Sequence-1       |
 *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 *      \                                                               /
 *      /                                                               \
 *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 *      |         Stream-N              |       Stream Sequence-N       |
 *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 *
 *      Chunk Flags:
 *
 *        Set to all zeros on transmit and ignored on receipt.
 *
 *      New Cumulative TSN: 32 bit u_int
 *
 *       This indicates the new cumulative TSN to the data receiver. Upon
 *       the reception of this value, the data receiver MUST consider
 *       any missing TSNs earlier than or equal to this value as received
 *       and stop reporting them as gaps in any subsequent SACKs.
 *
 *      Stream-N: 16 bit u_int
 *
 *       This field holds a stream number that was skipped by this
 *       FWD-TSN.
 *
 *      Stream Sequence-N: 16 bit u_int
 *       This field holds the sequence number associated with the stream
 *       that was skipped. The stream sequence field holds the largest stream
 *       sequence number in this stream being skipped.  The receiver of
 *       the FWD-TSN's can use the Stream-N and Stream Sequence-N fields
 *       to enable delivery of any stranded TSN's that remain on the stream
 *       re-ordering queues. This field MUST NOT report TSN's corresponding
 *       to DATA chunk that are marked as unordered. For ordered DATA
 *       chunks this field MUST be filled in.
 */
struct sctp_fwdtsn_skip {
	__be16 stream;
	__be16 ssn;
} __attribute__((packed));

struct sctp_fwdtsn_hdr {
	__be32 new_cum_tsn;
	struct sctp_fwdtsn_skip skip[0];
} __attribute((packed));

struct sctp_fwdtsn_chunk {
	struct sctp_chunkhdr chunk_hdr;
	struct sctp_fwdtsn_hdr fwdtsn_hdr;
} __attribute((packed));


/* ADDIP
 * Section 3.1.1 Address Configuration Change Chunk (ASCONF)
 *
 * 	Serial Number: 32 bits (unsigned integer)
 *	This value represents a Serial Number for the ASCONF Chunk. The
 *	valid range of Serial Number is from 0 to 2^32-1.
 *	Serial Numbers wrap back to 0 after reaching 2^32 -1.
 *
 *	Address Parameter: 8 or 20 bytes (depending on type)
 *	The address is an address of the sender of the ASCONF chunk,
 *	the address MUST be considered part of the association by the
 *	peer endpoint. This field may be used by the receiver of the 
 *	ASCONF to help in finding the association. This parameter MUST
 *	be present in every ASCONF message i.e. it is a mandatory TLV
 *	parameter.
 *
 *	ASCONF Parameter: TLV format
 *	Each Address configuration change is represented by a TLV
 *	parameter as defined in Section 3.2. One or more requests may
 *	be present in an ASCONF Chunk.
 *
 * Section 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
 * 
 *	Serial Number: 32 bits (unsigned integer)
 *	This value represents the Serial Number for the received ASCONF
 *	Chunk that is acknowledged by this chunk. This value is copied
 *	from the received ASCONF Chunk. 
 *
 *	ASCONF Parameter Response: TLV format
 *	The ASCONF Parameter Response is used in the ASCONF-ACK to
 *	report status of ASCONF processing.
 */
typedef struct sctp_addip_param {
	sctp_paramhdr_t	param_hdr;
	__be32		crr_id;
} __attribute__((packed)) sctp_addip_param_t;

typedef struct sctp_addiphdr {
	__be32	serial;
	__u8	params[0];
} __attribute__((packed)) sctp_addiphdr_t;

typedef struct sctp_addip_chunk {
	sctp_chunkhdr_t chunk_hdr;
	sctp_addiphdr_t addip_hdr;
} __attribute__((packed)) sctp_addip_chunk_t;

#endif /* __LINUX_SCTP_H__ */