tcp_sack.c File Reference

Handle encoding of TCP Selective ACKnowledgement (SACK) option. More...

#include "tcp_sack.h"

Include dependency graph for comp/schemes/tcp_sack.c:

Functions
static int	c_tcp_sack_code_block (const struct rohc_comp_ctxt *const context, const uint32_t reference, const sack_block_t *const sack_block, uint8_t *const rohc_data, const size_t rohc_max_len)
	Compress one SACK block.
static int	c_tcp_sack_code_pure_lsb (const struct rohc_comp_ctxt *const context, const uint32_t base, const uint32_t field, uint8_t *const rohc_data, const size_t rohc_max_len)
	Compress one SACK field value.
int	c_tcp_opt_sack_code (const struct rohc_comp_ctxt *const context, const uint32_t ack_value, const sack_block_t *const sack_blocks, const uint8_t length, const bool is_unchanged, uint8_t *const rohc_data, const size_t rohc_max_len)
	Compress one TCP Selective ACKnowledgement (SACK) option.

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Detailed Description

Handle encoding of TCP Selective ACKnowledgement (SACK) option.

Author:

Didier Barvaux <didier@barvaux.org>

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Function Documentation

int c_tcp_opt_sack_code	(	const struct rohc_comp_ctxt *const	context,
		const uint32_t	ack_value,
		const sack_block_t *const	sack_blocks,
		const uint8_t	length,
		const bool	is_unchanged,
		uint8_t *const	rohc_data,
		const size_t	rohc_max_len
	)

Compress one TCP Selective ACKnowledgement (SACK) option.

See RFC6846 page 68 (and RFC2018 for Selective Acknowledgement option)

Parameters:

	context	The compression context
	ack_value	The ack value
	sack_blocks	The SACK blocks to compress
	length	The length of the SACK blocks
	is_unchanged	Whether the SACK option is unchanged or not (only for irregular chain, use false for list item)
[out]	rohc_data	The ROHC packet being built
	rohc_max_len	The max remaining length in the ROHC buffer

Returns:

The length appended in the ROHC buffer if positive, -1 in case of error

static int c_tcp_sack_code_block	(	const struct rohc_comp_ctxt *const	context,
		const uint32_t	reference,
		const sack_block_t *const	sack_block,
		uint8_t *const	rohc_data,
		const size_t	rohc_max_len
	)			[static]

Compress one SACK block.

See RFC6846 page 68 (and RFC2018 for Selective Acknowledgement option)

Parameters:

	context	The compression context
	reference	The reference value
	sack_block	The SACK block to compress
[out]	rohc_data	The ROHC packet being built
	rohc_max_len	The max remaining length in the ROHC buffer

Returns:

The length appended in the ROHC buffer if positive, -1 in case of error

static int c_tcp_sack_code_pure_lsb	(	const struct rohc_comp_ctxt *const	context,
		const uint32_t	base,
		const uint32_t	field,
		uint8_t *const	rohc_data,
		const size_t	rohc_max_len
	)			[static]

Compress one SACK field value.

See RFC6846 page 67 (and RFC2018 for Selective Acknowledgement option)

Parameters:

	context	The compression context
	base	The base value
	field	The value to compress
[out]	rohc_data	The ROHC packet being built
	rohc_max_len	The max remaining length in the ROHC buffer

Returns:

The length appended in the ROHC buffer if positive, -1 in case of error