ROHC decompression context for the TCP profile. More...

#include "rohc_bit_ops.h"
#include "rohc_traces_internal.h"
#include "rohc_utils.h"
#include "rohc_debug.h"
#include "schemes/rfc4996.h"
#include "schemes/wlsb.h"
#include "protocols/tcp.h"
#include "crc.h"
#include "d_generic.h"
#include "config.h"
#include <string.h>
#include <stdint.h>

Include dependency graph for d_tcp.c:

Data Structures
struct	ipv6_option_context
	Define the IPv6 generic option context. More...
struct	ipv6_gre_option_context
	Define the IPv6 GRE option context. More...
struct	ipv6_mime_option_context
	Define the IPv6 MIME option context. More...
struct	ipv6_ah_option_context
	Define the IPv6 AH option context. More...
struct	ipvx_context
	Define the common IP header context to IPv4 and IPv6. More...
struct	ipv4_context
	Define the IPv4 header context. More...
struct	ipv6_context
	Define the IPv6 header context. More...
union	ip_context_ptr_t
	Define union of IP contexts pointers. More...
struct	d_tcp_context
	Define the TCP part of the decompression profile context. More...
Defines
#define	MAX_IP_CONTEXT_SIZE
#define	MAX_TCP_OPT_SIZE 64
Typedefs
typedef struct ipv6_option_context	ipv6_option_context_t
	Define the IPv6 option context for Destination, Hop-by-Hop and Routing option.
typedef struct ipv6_gre_option_context	ipv6_gre_option_context_t
	Define the IPv6 option context for GRE option.
typedef struct ipv6_mime_option_context	ipv6_mime_option_context_t
	Define the IPv6 option context for MIME option.
typedef struct ipv6_ah_option_context	ipv6_ah_option_context_t
	Define the IPv6 option context for AH option.
typedef struct ipvx_context	ipvx_context_t
	Define the common IP header context to IPv4 and IPv6.
typedef struct ipv4_context	ipv4_context_t
	Define the IPv4 header context.
typedef struct ipv6_context	ipv6_context_t
	Define the IPv6 header context.
Functions
static void *	d_tcp_create (const struct rohc_decomp_ctxt *const context)
	Create the TCP decompression context.
static void	d_tcp_destroy (void *const context)
	Destroy the context.
static int	tcp_decode_static_ipv6_option (struct rohc_decomp_ctxt const context, ip_context_ptr_t ip_context, uint8_t protocol, const unsigned char const rohc_packet, const size_t rohc_length, base_header_ip_t base_header)
	Decode the static IP v6 option header of the rohc packet.
static unsigned int	tcp_copy_static_ipv6_option (const struct rohc_decomp_ctxt *const context, uint8_t protocol, ip_context_ptr_t ip_context, base_header_ip_t base_header)
	Copy the static IP part to the IPv6 option header.
static int	tcp_decode_dynamic_ipv6_option (struct rohc_decomp_ctxt const context, ip_context_ptr_t ip_context, uint8_t protocol, const unsigned char const rohc_packet, const size_t rohc_length, base_header_ip_t base_header)
	Decode the dynamic IP v6 option header of the rohc packet.
static int	tcp_decode_static_ip (struct rohc_decomp_ctxt const context, ip_context_ptr_t ip_context, const unsigned char const rohc_packet, const size_t rohc_length, unsigned char *dest)
	Decode the static IP header of the rohc packet.
static unsigned int	tcp_copy_static_ip (const struct rohc_decomp_ctxt *const context, ip_context_ptr_t ip_context, base_header_ip_t base_header)
	Copy the static IP part to the IP header.
static int	tcp_decode_dynamic_ip (struct rohc_decomp_ctxt const context, ip_context_ptr_t ip_context, const unsigned char const rohc_packet, const size_t rohc_length, unsigned char *dest)
	Decode the dynamic IP header of the rohc packet.
static int	tcp_decode_irregular_ip (struct rohc_decomp_ctxt const context, ip_context_ptr_t ip_context, base_header_ip_t base_header, const uint8_t rohc_data, int is_innermost, int ttl_irregular_chain_flag, int ip_inner_ecn)
	Decode the irregular IP header of the rohc packet.
static int	tcp_decode_static_tcp (struct rohc_decomp_ctxt const context, const unsigned char const rohc_packet, const size_t rohc_length, tcphdr_t *tcp)
	Decode the TCP static part of the ROHC packet.
static unsigned int	tcp_copy_static_tcp (struct rohc_decomp_ctxt const context, tcphdr_t tcp)
	Copy the TCP static part of the TCP header.
static int	tcp_decode_dynamic_tcp (struct rohc_decomp_ctxt const context, const unsigned char const rohc_packet, const size_t rohc_length, tcphdr_t *tcp)
	Decode the TCP dynamic part of the ROHC packet.
static rohc_packet_t	tcp_detect_packet_type (const struct rohc_decomp_ctxt const context, const uint8_t const rohc_packet, const size_t rohc_length, const size_t large_cid_len)
	Detect the type of ROHC packet for the TCP profile.
static int	d_tcp_decode_ir (struct rohc_decomp_ctxt context, const unsigned char const rohc_packet, const size_t rohc_length, const size_t add_cid_len, const size_t large_cid_len, unsigned char *dest)
	Decode one IR packet for the TCP profile.
static int	d_tcp_decode_irdyn (struct rohc_decomp_ctxt context, const unsigned char const rohc_packet, const size_t rohc_length, const size_t large_cid_len, unsigned char *dest)
	Decode one IR-DYN packet for the TCP profile.
static int	d_tcp_decode_CO (struct rohc_decomp decomp, struct rohc_decomp_ctxt context, const unsigned char const rohc_packet, const size_t rohc_length, const size_t add_cid_len, const size_t large_cid_len, const rohc_packet_t packet_type, unsigned char dest)
	Decode one CO packet.
static bool	rohc_decomp_tcp_decode_seq (const struct rohc_decomp_ctxt const context, const uint32_t seq_bits, const size_t seq_bits_nr, const rohc_lsb_shift_t p, uint32_t const seq)
	decode the tcp sequence number from packet and context information
static bool	rohc_decomp_tcp_decode_ack (const struct rohc_decomp_ctxt const context, const uint8_t ack_flag, const uint32_t ack_bits, const size_t ack_bits_nr, const rohc_lsb_shift_t p, uint32_t const ack)
	Decode the TCP ACK number from packet and context information.
static uint32_t	d_tcp_get_msn (const struct rohc_decomp_ctxt *const context)
	Get the reference MSN value of the context.
static const uint8_t *	d_ts_lsb (const struct rohc_decomp_ctxt const context, const struct rohc_lsb_decode const lsb, const uint8_t ptr, uint32_t const timestamp)
	Decompress the LSBs bits of TimeStamp TCP option.
static const uint8_t *	d_tcp_opt_sack (const struct rohc_decomp_ctxt const context, const uint8_t ptr, uint8_t **pOptions, uint32_t ack_value)
	Uncompress the SACK TCP option.
static rohc_status_t	d_tcp_decode (struct rohc_decomp const decomp, struct rohc_decomp_ctxt const context, const struct rohc_buf rohc_packet, const size_t add_cid_len, const size_t large_cid_len, struct rohc_buf const uncomp_packet, rohc_packet_t const packet_type)
	Decode one IR, IR-DYN, IR-CO IR-CR packet for TCP profile.
static int	tcp_decode_irregular_tcp (struct rohc_decomp_ctxt const context, base_header_ip_t base_header_inner, tcphdr_t tcp, const uint8_t *const rohc_data)
	Decode the irregular TCP header of the rohc packet.
static int	d_size_ts_lsb (const struct rohc_decomp_ctxt const context, const uint8_t const rohc_data, const size_t rohc_length)
	Calculate the size of TimeStamp compressed TCP option.
static int	d_sack_pure_lsb (const uint8_t ptr, uint32_t base, uint32_t field)
	Uncompress the SACK field value.
static const uint8_t *	d_sack_block (const uint8_t ptr, uint32_t reference, sack_block_t sack_block)
	Uncompress a SACK block.
static int	d_sack_var_length_size_dec (const struct rohc_decomp_ctxt const context, const uint8_t const rohc_data, const size_t rohc_length)
	Calculate the size of the compressed SACK field value.
static int	d_sack_block_size (const struct rohc_decomp_ctxt const context, const uint8_t const rohc_data, const size_t rohc_length)
	Calculate the size of the compressed SACK block.
static int	d_tcp_size_opt_sack (const struct rohc_decomp_ctxt const context, const uint8_t const rohc_data, const size_t rohc_length, uint16_t *const uncomp_len)
	Calculate the size of the SACK TCP option.
static const uint8_t *	d_tcp_opt_generic (const uint8_t ptr, uint8_t *pOptions)
	Uncompress a generic TCP option.
static int	d_tcp_size_opt_generic (struct d_tcp_context tcp_context, const uint8_t const rohc_data, const size_t rohc_length, uint16_t *const uncomp_len)
	Calculate the size of a generic TCP option.
static const uint8_t *	tcp_decompress_tcp_options (struct rohc_decomp_ctxt const context, const uint8_t data, const size_t data_len, tcphdr_t *const tcp)
	Uncompress the TCP options.
static int	tcp_size_decompress_tcp_options (struct rohc_decomp_ctxt const context, const uint8_t data, const size_t data_len, uint16_t *uncomp_len)
	Calculate the compressed TCP options size.
Variables
struct rohc_decomp_profile	d_tcp_profile
	Define the decompression part of the TCP profile as described in the RFC 3095.

Detailed Description

ROHC decompression context for the TCP profile.

Author:: FWX <rohc_team@dialine.fr>; Didier Barvaux <didier@barvaux.org>; Didier Barvaux <didier.barvaux@toulouse.viveris.com>

Define Documentation

#define MAX_IP_CONTEXT_SIZE

Value:

(rohc_max(sizeof(ipv4_context_t), \
                  sizeof(ipv6_context_t) + sizeof(ipv6_option_context_t) * 10) \
         * 4)

#define MAX_TCP_OPT_SIZE 64

Typedef Documentation

typedef struct ipv4_context ipv4_context_t

Define the IPv4 header context.

typedef struct ipv6_ah_option_context ipv6_ah_option_context_t

Define the IPv6 option context for AH option.

typedef struct ipv6_context ipv6_context_t

Define the IPv6 header context.

typedef struct ipv6_gre_option_context ipv6_gre_option_context_t

Define the IPv6 option context for GRE option.

typedef struct ipv6_mime_option_context ipv6_mime_option_context_t

Define the IPv6 option context for MIME option.

typedef struct ipv6_option_context ipv6_option_context_t

Define the IPv6 option context for Destination, Hop-by-Hop and Routing option.

typedef struct ipvx_context ipvx_context_t

Define the common IP header context to IPv4 and IPv6.

Function Documentation

static const uint8_t* d_sack_block	(	const uint8_t *	ptr,
		uint32_t	reference,
		sack_block_t *	sack_block
	)		`[static]`

Uncompress a SACK block.

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

Parameters:

ptr	Pointer to the compressed value
reference	The reference value
sack_block	Pointer to the uncompressed sack_block

Returns:: Pointer to the next compressed value

static int d_sack_block_size	(	const struct rohc_decomp_ctxt *const	context,
		const uint8_t *const	rohc_data,
		const size_t	rohc_length
	)		`[static]`

Calculate the size of the compressed SACK block.

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

Parameters:

context	The decompression context
rohc_data	The remaining ROHC data to decode
rohc_length	The length (in bytes) of the remaining ROHC data

Returns:: The size (in bytes) of the compressed value, -1 in case of problem

static int d_sack_pure_lsb	(	const uint8_t *	ptr,
		uint32_t	base,
		uint32_t *	field
	)		`[static]`

Uncompress the SACK field value.

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

Parameters:

ptr	Pointer to the compressed value
base	The base value
field	Pointer to the uncompressed value

Returns:: Number of bytes read, -1 if error

static int d_sack_var_length_size_dec	(	const struct rohc_decomp_ctxt *const	context,
		const uint8_t *const	rohc_data,
		const size_t	rohc_length
	)		`[static]`

Calculate the size of the compressed SACK field value.

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

Parameters:

context	The decompression context
rohc_data	The remaining ROHC data to decode
rohc_length	The length (in bytes) of the remaining ROHC data

Returns:: The size (in bytes) of the compressed value, -1 in case of problem

static int d_size_ts_lsb	(	const struct rohc_decomp_ctxt *const	context,
		const uint8_t *const	rohc_data,
		const size_t	rohc_length
	)		`[static]`

Calculate the size of TimeStamp compressed TCP option.

Parameters:

context	The decompression context
rohc_data	The remaining ROHC data
rohc_length	The length (in bytes) of the remaining ROHC data

Returns:: The length (in bytes) of the compressed TCP option, -1 in case of problem

static void * d_tcp_create ( const struct rohc_decomp_ctxt *const context ) [static]

Create the TCP decompression context.

This function is one of the functions that must exist in one profile for the framework to work.

Parameters:

context The decompression context

Returns:: The newly-created TCP decompression context

static rohc_status_t d_tcp_decode	(	struct rohc_decomp *const	decomp,
		struct rohc_decomp_ctxt *const	context,
		const struct rohc_buf	rohc_packet,
		const size_t	add_cid_len,
		const size_t	large_cid_len,
		struct rohc_buf *const	uncomp_packet,
		rohc_packet_t *const	packet_type
	)		`[static]`

Decode one IR, IR-DYN, IR-CO IR-CR packet for TCP profile.

This function is one of the functions that must exist in one profile for the framework to work.

Parameters:

	decomp	The ROHC decompressor
	context	The decompression context
	rohc_packet	The ROHC packet to decode
	add_cid_len	The length of the optional Add-CID field
	large_cid_len	The length of the optional large CID field
[out]	uncomp_packet	The uncompressed packet
	packet_type	IN: The type of the ROHC packet to parse OUT: The type of the parsed ROHC packet

Returns:: ROHC_STATUS_OK if packet is successfully decoded, ROHC_STATUS_MALFORMED if packet is malformed, ROHC_STATUS_BAD_CRC if a CRC error occurs, ROHC_STATUS_ERROR if an error occurs

static int d_tcp_decode_CO	(	struct rohc_decomp *	decomp,
		struct rohc_decomp_ctxt *	context,
		const unsigned char *const	rohc_packet,
		const size_t	rohc_length,
		const size_t	add_cid_len,
		const size_t	large_cid_len,
		const rohc_packet_t	packet_type,
		unsigned char *	dest
	)		`[static]`

Decode one CO packet.


  RFC 6846, section 7.3. Compressed (CO) Packets

     0   1   2   3   4   5   6   7
    --- --- --- --- --- --- --- ---
 1  :         Add-CID octet         :  if for small CIDs and CID 1-15
    +---+---+---+---+---+---+---+---+
 2  |   First octet of base header  |  (with type indication)
    +---+---+---+---+---+---+---+---+
    :                               :
 3  /   0, 1, or 2 octets of CID    /  1-2 octets if large CIDs
    :                               :
    +---+---+---+---+---+---+---+---+
 4  /   Remainder of base header    /  variable number of octets
    +---+---+---+---+---+---+---+---+
    :        Irregular chain        :
 5  /   (including irregular chain  /  variable
    :    items for TCP options)     :
     --- --- --- --- --- --- --- ---
    |                               |
 6  /            Payload            / variable length
    |                               |
     - - - - - - - - - - - - - - - -

Parameters:

decomp	The ROHC decompressor
context	The decompression context
rohc_packet	The ROHC packet to decode
rohc_length	The length of the ROHC packet
add_cid_len	The length of the optional Add-CID field
large_cid_len	The length of the optional large CID field
packet_type	The type of the ROHC packet to parse
dest	OUT: The decoded IP packet

Returns:: The length of the uncompressed IP packet or ROHC_ERROR if an error occurs or ROHC_ERROR_CRC if a CRC error occurs

static int d_tcp_decode_ir	(	struct rohc_decomp_ctxt *	context,
		const unsigned char *const	rohc_packet,
		const size_t	rohc_length,
		const size_t	add_cid_len,
		const size_t	large_cid_len,
		unsigned char *	dest
	)		`[static]`

Decode one IR packet for the TCP profile.

Parameters:

context	The decompression context
rohc_packet	The ROHC packet to decode
rohc_length	The length of the ROHC packet to decode
add_cid_len	The length of the optional Add-CID field
large_cid_len	The length of the optional large CID field
dest	The decoded IP packet

Returns:: The length of the uncompressed IP packet or ROHC_OK_NO_DATA if packet is feedback only or ROHC_ERROR if an error occurs

static int d_tcp_decode_irdyn	(	struct rohc_decomp_ctxt *	context,
		const unsigned char *const	rohc_packet,
		const size_t	rohc_length,
		const size_t	large_cid_len,
		unsigned char *	dest
	)		`[static]`

Decode one IR-DYN packet for the TCP profile.

Parameters:

context	The decompression context
rohc_packet	The ROHC packet to decode
rohc_length	The length of the ROHC packet to decode
large_cid_len	The length of the optional large CID field
dest	The decoded IP packet

Returns:: The length of the uncompressed IP packet or ROHC_OK_NO_DATA if packet is feedback only or ROHC_ERROR if an error occurs

static void d_tcp_destroy ( void *const context ) [static]

Destroy the context.

This function is one of the functions that must exist in one profile for the framework to work.

Parameters:

context The compression context

static uint32_t d_tcp_get_msn ( const struct rohc_decomp_ctxt *const context ) [static]

Get the reference MSN value of the context.

This function is one of the functions that must exist in one profile for the framework to work.

Parameters:

context The decompression context

Returns:: The reference MSN value

static const uint8_t* d_tcp_opt_generic	(	const uint8_t *	ptr,
		uint8_t **	pOptions
	)		`[static]`

Uncompress a generic TCP option.

See RFC4996 page 67

Parameters:

ptr	Pointer to the compressed TCP option
pOptions	Pointer to the uncompressed TCP option

Returns:: Pointer to the next compressed value

static const uint8_t * d_tcp_opt_sack	(	const struct rohc_decomp_ctxt *const	context,
		const uint8_t *	ptr,
		uint8_t **	pOptions,
		uint32_t	ack_value
	)		`[static]`

Uncompress the SACK TCP option.

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

Parameters:

context	The decompression context
ptr	Pointer to the compressed value
pOptions	Pointer to the uncompressed option
ack_value	The ack value

Returns:: Pointer to the next compressed value

static int d_tcp_size_opt_generic	(	struct d_tcp_context *	tcp_context,
		const uint8_t *const	rohc_data,
		const size_t	rohc_length,
		uint16_t *const	uncomp_len
	)		`[static]`

Calculate the size of a generic TCP option.

See RFC4996 page 67

Parameters:

tcp_context	The specific TCP context
rohc_data	The remaining ROHC data
rohc_length	The length (in bytes) of the remaining ROHC data
uncomp_len	The length (in bytes) of the uncompressed TCP option

Returns:: The number of ROHC bytes parsed

static int d_tcp_size_opt_sack	(	const struct rohc_decomp_ctxt *const	context,
		const uint8_t *const	rohc_data,
		const size_t	rohc_length,
		uint16_t *const	uncomp_len
	)		`[static]`

Calculate the size of the SACK TCP option.

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

Parameters:

context	The decompression context
rohc_data	The remaining ROHC data to decode
rohc_length	The length (in bytes) of the remaining ROHC data
uncomp_len	The length (in bytes) of the uncompressed TCP option

Returns:: The size (in bytes) of the compressed value, -1 in case of problem

static const uint8_t * d_ts_lsb	(	const struct rohc_decomp_ctxt *const	context,
		const struct rohc_lsb_decode *const	lsb,
		const uint8_t *	ptr,
		uint32_t *const	timestamp
	)		`[static]`

Decompress the LSBs bits of TimeStamp TCP option.

See RFC4996 page 65

Parameters:

context	The decompression context
lsb	The LSB decoding context
ptr	Pointer to the compressed value
timestamp	Pointer to the uncompressed value

Returns:: Pointer to the next compressed value

static bool rohc_decomp_tcp_decode_ack	(	const struct rohc_decomp_ctxt *const	context,
		const uint8_t	ack_flag,
		const uint32_t	ack_bits,
		const size_t	ack_bits_nr,
		const rohc_lsb_shift_t	p,
		uint32_t *const	ack
	)		`[static]`

Decode the TCP ACK number from packet and context information.

static bool rohc_decomp_tcp_decode_seq	(	const struct rohc_decomp_ctxt *const	context,
		const uint32_t	seq_bits,
		const size_t	seq_bits_nr,
		const rohc_lsb_shift_t	p,
		uint32_t *const	seq
	)		`[static]`

decode the tcp sequence number from packet and context information

static unsigned int tcp_copy_static_ip	(	const struct rohc_decomp_ctxt *const	context,
		ip_context_ptr_t	ip_context,
		base_header_ip_t	base_header
	)		`[static]`

Copy the static IP part to the IP header.

Parameters:

context	The decompression context
ip_context	The specific IP decompression context
base_header	The IP header

Returns:: The size of the static part

static unsigned int tcp_copy_static_ipv6_option	(	const struct rohc_decomp_ctxt *const	context,
		uint8_t	protocol,
		ip_context_ptr_t	ip_context,
		base_header_ip_t	base_header
	)		`[static]`

Copy the static IP part to the IPv6 option header.

Parameters:

context	The decompression context
protocol	The IPv6 protocol option
ip_context	The specific IP decompression context
base_header	The IP header

Returns:: The size of the static part

static unsigned int tcp_copy_static_tcp	(	struct rohc_decomp_ctxt *const	context,
		tcphdr_t *	tcp
	)		`[static]`

Copy the TCP static part of the TCP header.

Parameters:

context	The decompression context
tcp	The decoded TCP header

Returns:: The number of bytes copied to the TCP header

static int tcp_decode_dynamic_ip	(	struct rohc_decomp_ctxt *const	context,
		ip_context_ptr_t	ip_context,
		const unsigned char *const	rohc_packet,
		const size_t	rohc_length,
		unsigned char *	dest
	)		`[static]`

Decode the dynamic IP header of the rohc packet.

Parameters:

context	The decompression context
ip_context	The specific IP decompression context
rohc_packet	The remaining part of the ROHC packet
rohc_length	The remaining length (in bytes) of the ROHC packet
dest	The decoded IP packet

Returns:: The length of dynamic IP header in case of success, -1 if an error occurs

static int tcp_decode_dynamic_ipv6_option	(	struct rohc_decomp_ctxt *const	context,
		ip_context_ptr_t	ip_context,
		uint8_t	protocol,
		const unsigned char *const	rohc_packet,
		const size_t	rohc_length,
		base_header_ip_t	base_header
	)		`[static]`

Decode the dynamic IP v6 option header of the rohc packet.

Parameters:

context	The decompression context
ip_context	The specific IP decompression context
protocol	The IPv6 protocol option
rohc_packet	The remaining part of the ROHC packet
rohc_length	The remaining length (in bytes) of the ROHC packet
base_header	The decoded IP packet

Returns:: The length of dynamic IP header 0 if an error occurs

static int tcp_decode_dynamic_tcp	(	struct rohc_decomp_ctxt *const	context,
		const unsigned char *const	rohc_packet,
		const size_t	rohc_length,
		tcphdr_t *	tcp
	)		`[static]`

Decode the TCP dynamic part 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 the ROHC packet
tcp	The decoded TCP header

Returns:: The number of bytes read in the ROHC packet, -1 in case of failure

static int tcp_decode_irregular_ip	(	struct rohc_decomp_ctxt *const	context,
		ip_context_ptr_t	ip_context,
		base_header_ip_t	base_header,
		const uint8_t *	rohc_data,
		int	is_innermost,
		int	ttl_irregular_chain_flag,
		int	ip_inner_ecn
	)		`[static]`

Decode the irregular IP header of the rohc packet.

Parameters:

context	The decompression context
ip_context	The specific IP decompression context
base_header	The IP header under built
rohc_data	The remaining part of the ROHC packet
is_innermost	True if the IP header is the innermost of the packet
ttl_irregular_chain_flag	True if one of the TTL value of header change
ip_inner_ecn	The ECN flags of inner IP header

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

static int tcp_decode_irregular_tcp	(	struct rohc_decomp_ctxt *const	context,
		base_header_ip_t	base_header_inner,
		tcphdr_t *	tcp,
		const uint8_t *const	rohc_data
	)		`[static]`

Decode the irregular TCP header of the rohc packet.

See RFC4996 page 75

Parameters:

context	The decompression context
base_header_inner	The inner IP header under built
tcp	The TCP header under built
rohc_data	The remain datas of the rohc packet

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

static int tcp_decode_static_ip	(	struct rohc_decomp_ctxt *const	context,
		ip_context_ptr_t	ip_context,
		const unsigned char *const	rohc_packet,
		const size_t	rohc_length,
		unsigned char *	dest
	)		`[static]`

Decode the static IP header of the rohc packet.

Parameters:

context	The decompression context
ip_context	The specific IP decompression context
rohc_packet	The remaining part of the ROHC packet
rohc_length	The remaining length (in bytes) of the ROHC packet
dest	The decoded IP packet

Returns:: The length of static IP header in case of success, -1 if an error occurs

static int tcp_decode_static_ipv6_option	(	struct rohc_decomp_ctxt *const	context,
		ip_context_ptr_t	ip_context,
		uint8_t	protocol,
		const unsigned char *const	rohc_packet,
		const size_t	rohc_length,
		base_header_ip_t	base_header
	)		`[static]`

Decode the static IP v6 option header of the rohc packet.

Parameters:

context	The decompression context
ip_context	The specific IP decompression context
protocol	The IPv6 protocol option
rohc_packet	The remaining part of the ROHC packet
rohc_length	The remaining length (in bytes) of the ROHC packet
base_header	The decoded IP packet

Returns:: The length of static IP header in case of success, -1 if an error occurs

static int tcp_decode_static_tcp	(	struct rohc_decomp_ctxt *const	context,
		const unsigned char *const	rohc_packet,
		const size_t	rohc_length,
		tcphdr_t *	tcp
	)		`[static]`

Decode the TCP static part 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 the ROHC packet
tcp	The decoded TCP header

Returns:: The number of bytes read in the ROHC packet, -1 in case of failure

static const uint8_t* tcp_decompress_tcp_options	(	struct rohc_decomp_ctxt *const	context,
		const uint8_t *	data,
		const size_t	data_len,
		tcphdr_t *const	tcp
	)		`[static]`

Uncompress the TCP options.

Parameters:

	context	The decompression context
	data	The compressed TCP options
	data_len	The length (in bytes) of compressed TCP options
[in,out]	tcp	The TCP header where to append uncompressed TCP options

Returns:: Pointer on data after the compressed TCP options, NULL in case of malformed data

static rohc_packet_t tcp_detect_packet_type	(	const struct rohc_decomp_ctxt *const	context,
		const uint8_t *const	rohc_packet,
		const size_t	rohc_length,
		const size_t	large_cid_len
	)		`[static]`

Detect the type of ROHC packet for the TCP profile.

Parameters:

context	The decompression context
rohc_packet	The ROHC packet
rohc_length	The length of the ROHC packet
large_cid_len	The length of the optional large CID field

Returns:: The packet type

static int tcp_size_decompress_tcp_options	(	struct rohc_decomp_ctxt *const	context,
		const uint8_t *	data,
		const size_t	data_len,
		uint16_t *	uncomp_len
	)		`[static]`

Calculate the compressed TCP options size.

See RFC6846 pages 26-27.

Parameters:

	context	The decompression context
	data	The compressed TCP options
	data_len	The length (in bytes) of compressed TCP options
[out]	uncomp_len	The length (in bytes) of uncompressed TCP options

Returns:: The length of compressed TCP options, -1 in case of malformed data

Variable Documentation

struct rohc_decomp_profile d_tcp_profile

Initial value:

{
        .id              = ROHC_PROFILE_TCP, 
        .new_context     = d_tcp_create,
        .free_context    = d_tcp_destroy,
        .decode          = d_tcp_decode,
        .detect_pkt_type = tcp_detect_packet_type,
        .get_sn          = d_tcp_get_msn
}

Define the decompression part of the TCP profile as described in the RFC 3095.

Data Structures

Defines

Typedefs

Functions

Variables

Detailed Description

Define Documentation

Typedef Documentation

Function Documentation

Variable Documentation