d_tcp_irregular.c File Reference

Handle the irregular chain of the TCP decompression profile. More...

#include "d_tcp_irregular.h"
#include "d_tcp_defines.h"
#include "d_tcp_opts_list.h"
#include "rohc_utils.h"
#include <string.h>

Include dependency graph for d_tcp_irregular.c:

Functions
static int	tcp_parse_irregular_ip (const struct rohc_decomp_ctxt *const context, const ip_context_t *const ip_context, const uint8_t *rohc_data, const size_t rohc_data_len, const bool is_innermost, const tcp_ip_id_behavior_t ip_id_behavior, struct rohc_tcp_extr_bits *const bits, struct rohc_tcp_extr_ip_bits *const ip_bits)
	Decode the irregular IP header of the rohc packet.
static int	tcp_parse_irregular_ipv4 (const struct rohc_decomp_ctxt *const context, const uint8_t *rohc_data, const size_t rohc_data_len, const bool is_innermost, const tcp_ip_id_behavior_t ip_id_behavior, struct rohc_tcp_extr_bits *const bits, struct rohc_tcp_extr_ip_bits *const ip_bits)
	Decode the irregular IPv4 header of the rohc packet.
static int	tcp_parse_irregular_ipv6 (const struct rohc_decomp_ctxt *const context, const uint8_t *rohc_data, const size_t rohc_data_len, const bool is_innermost, struct rohc_tcp_extr_bits *const bits, struct rohc_tcp_extr_ip_bits *const ip_bits)
	Decode the irregular IPv6 header of the rohc packet.
static int	tcp_parse_irregular_tcp (const struct rohc_decomp_ctxt *const context, const uint8_t *const rohc_data, const size_t rohc_data_len, struct rohc_tcp_extr_bits *const bits, struct rohc_tcp_extr_ip_bits *const ip_inner_bits)
	Decode the irregular TCP header of the rohc packet.
static bool	d_tcp_is_ecn_used (const struct d_tcp_context tcp_ctxt, const struct rohc_tcp_extr_bits bits)
	Determine whether the TCP ECN flags are used or not.
bool	tcp_parse_irreg_chain (const struct rohc_decomp_ctxt *const context, const uint8_t *const rohc_packet, const size_t rohc_length, const tcp_ip_id_behavior_t innermost_ip_id_behavior, struct rohc_tcp_extr_bits *const bits, size_t *const parsed_len)
	Parse the irregular chain of the ROHC packet.

---

Detailed Description

Handle the irregular chain of the TCP decompression profile.

Author:

FWX <rohc_team@dialine.fr>

Didier Barvaux <didier@barvaux.org>

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

---

Function Documentation

static bool d_tcp_is_ecn_used	(	const struct d_tcp_context	tcp_ctxt,
		const struct rohc_tcp_extr_bits	bits
	)			[inline, static]

Determine whether the TCP ECN flags are used or not.

The bits extracted from the current ROHC packet are used if present. The value recorded in the decompression context is used as fallback otherwise.

Parameters:

	tcp_ctxt	The TCP decompression context
	bits	The bits extracted from the ROHC packet

Returns:

true if the TCP ECN flags are used by the compressed TCP packet or not, false if they are not

bool tcp_parse_irreg_chain	(	const struct rohc_decomp_ctxt *const	context,
		const uint8_t *const	rohc_packet,
		const size_t	rohc_length,
		const tcp_ip_id_behavior_t	innermost_ip_id_behavior,
		struct rohc_tcp_extr_bits *const	bits,
		size_t *const	parsed_len
	)

Parse the irregular chain of the ROHC packet.

Parameters:

	context	The decompression context
	rohc_packet	The remaining part of the ROHC packet
	rohc_length	The remaining length (in bytes) of ROHC packet
	innermost_ip_id_behavior	The behavior of the innermost IP-ID
[out]	bits	The bits extracted from the irregular chain in case of success
[out]	parsed_len	The length (in bytes) of irregular chain in case of success

Returns:

true in the irregular chain was successfully parsed, false if the ROHC packet was malformed

static int tcp_parse_irregular_ip	(	const struct rohc_decomp_ctxt *const	context,
		const ip_context_t *const	ip_context,
		const uint8_t *	rohc_data,
		const size_t	rohc_data_len,
		const bool	is_innermost,
		const tcp_ip_id_behavior_t	ip_id_behavior,
		struct rohc_tcp_extr_bits *const	bits,
		struct rohc_tcp_extr_ip_bits *const	ip_bits
	)			[static]

Decode the irregular IP header of the rohc packet.

Parameters:

	context	The decompression context
	ip_context	The specific IP decompression context
	rohc_data	The remaining part of the ROHC packet
	rohc_data_len	The length of remaining part of the ROHC packet
	is_innermost	True if the IP header is the innermost of the packet
	ip_id_behavior	The IP-ID behavior of the IP header (may be different from the context)
[out]	bits	The bits extracted from the irregular chain in case of success
[out]	ip_bits	The bits extracted from the irregular chain for the current IPv6 header in case of success

Returns:

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

static int tcp_parse_irregular_ipv4	(	const struct rohc_decomp_ctxt *const	context,
		const uint8_t *	rohc_data,
		const size_t	rohc_data_len,
		const bool	is_innermost,
		const tcp_ip_id_behavior_t	ip_id_behavior,
		struct rohc_tcp_extr_bits *const	bits,
		struct rohc_tcp_extr_ip_bits *const	ip_bits
	)			[static]

Decode the irregular IPv4 header of the rohc packet.

Parameters:

	context	The decompression context
	rohc_data	The remaining part of the ROHC packet
	rohc_data_len	The length of remaining part of the ROHC packet
	is_innermost	True if the IP header is the innermost of the packet
	ip_id_behavior	The IP-ID behavior of the IP header (may be different from the context)
[out]	bits	The bits extracted from the irregular chain in case of success
[out]	ip_bits	The bits extracted from the irregular chain for the current IPv6 header in case of success

Returns:

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

static int tcp_parse_irregular_ipv6	(	const struct rohc_decomp_ctxt *const	context,
		const uint8_t *	rohc_data,
		const size_t	rohc_data_len,
		const bool	is_innermost,
		struct rohc_tcp_extr_bits *const	bits,
		struct rohc_tcp_extr_ip_bits *const	ip_bits
	)			[static]

Decode the irregular IPv6 header of the rohc packet.

Parameters:

	context	The decompression context
	rohc_data	The remaining part of the ROHC packet
	rohc_data_len	The length of remaining part of the ROHC packet
	is_innermost	True if the IP header is the innermost of the packet
[out]	bits	The bits extracted from the irregular chain in case of success
[out]	ip_bits	The bits extracted from the irregular chain for the current IPv6 header in case of success

Returns:

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

static int tcp_parse_irregular_tcp	(	const struct rohc_decomp_ctxt *const	context,
		const uint8_t *const	rohc_data,
		const size_t	rohc_data_len,
		struct rohc_tcp_extr_bits *const	bits,
		struct rohc_tcp_extr_ip_bits *const	ip_inner_bits
	)			[static]

Decode the irregular TCP header of the rohc packet.

See RFC4996 page 75

Parameters:

	context	The decompression context
	rohc_data	The remain data of the rohc packet
	rohc_data_len	The length of the remain data of the rohc packet
[out]	bits	The bits extracted from the TCP part of the irregular chain
[out]	ip_inner_bits	The bits extracted from the innermost IP part of the irregular chain

Returns:

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