tcp_sack.c File Reference

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

#include "tcp_sack.h"
#include "rohc_utils.h"

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

Functions
static int	d_tcp_sack_block (const struct rohc_decomp_ctxt *const context, const uint8_t *const data, const size_t data_len, sack_block_t *const sack_block)
	Parse a SACK block of the TCP SACK option.
static int	d_tcp_sack_pure_lsb (const struct rohc_decomp_ctxt *const context, const uint8_t *const data, const size_t data_len, uint32_t *const sack_field)
	Parse a SACK field of a SACK block of the TCP SACK option.
int	d_tcp_sack_parse (const struct rohc_decomp_ctxt *const context, const uint8_t *const data, const size_t data_len, struct d_tcp_opt_sack *const opt_sack)
	Parse the SACK TCP option.

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Detailed Description

Handle decoding of TCP Selective ACKnowledgement (SACK) option.

Author:

FWX <rohc_team@dialine.fr>

Didier Barvaux <didier@barvaux.org>

Didier Barvaux <didier.barvaux@toulouse.viveris.com>

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Function Documentation

static int d_tcp_sack_block	(	const struct rohc_decomp_ctxt *const	context,
		const uint8_t *const	data,
		const size_t	data_len,
		sack_block_t *const	sack_block
	)			[static]

Parse a SACK block of the TCP SACK option.

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

Parameters:

	context	The decompression context
	data	The data to parse
	data_len	The length of the data to parse
[out]	sack_block	The SACK block bits extracted from ROHC packet

Returns:

The number of data bytes parsed, -1 if data is malformed

int d_tcp_sack_parse	(	const struct rohc_decomp_ctxt *const	context,
		const uint8_t *const	data,
		const size_t	data_len,
		struct d_tcp_opt_sack *const	opt_sack
	)

Parse the SACK TCP option.

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

Parameters:

	context	The decompression context
	data	The ROHC data to parse
	data_len	The length of the ROHC data to parse
[out]	opt_sack	The information of SACK option extracted from the packet

Returns:

The number of ROHC bytes parsed, -1 if packet is malformed

static int d_tcp_sack_pure_lsb	(	const struct rohc_decomp_ctxt *const	context,
		const uint8_t *const	data,
		const size_t	data_len,
		uint32_t *const	sack_field
	)			[static]

Parse a SACK field of a SACK block of the TCP SACK option.

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

Parameters:

	context	The decompression context
	data	The ROHC data to parse
	data_len	The length of the ROHC data to parse
[out]	sack_field	The uncompressed SACK field

Returns:

The number of data bytes parsed, -1 if data is malformed