d_ip.h File Reference

ROHC decompression context for the IP-only profile. More...

#include "rohc_decomp_rfc3095.h"

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Functions
rohc_packet_t	ip_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 IP-based non-RTP profiles. More...
int	ip_parse_dynamic_ip (const struct rohc_decomp_ctxt *const context, const uint8_t *packet, const size_t length, struct rohc_extr_bits *const bits)
	Parse the IP dynamic part of the ROHC packet. More...
int	ip_parse_ext3 (const struct rohc_decomp_ctxt *const context, const uint8_t *const rohc_data, const size_t rohc_data_len, const rohc_packet_t packet_type, struct rohc_extr_bits *const bits)
	Parse the extension 3 of the UOR-2 packet. More...
int	parse_outer_header_flags (const struct rohc_decomp_ctxt *const context, const uint8_t *const flags, const uint8_t *fields, const size_t length, struct rohc_extr_ip_bits *const bits)
	Parse the outer IP header flags and fields. More...
int	parse_inner_header_flags (const struct rohc_decomp_ctxt *const context, const uint8_t *const flags, const uint8_t *fields, const size_t length, struct rohc_extr_ip_bits *const bits)
	Parse the inner IP header flags and fields. More...

Detailed Description

ROHC decompression context for the IP-only profile.

Author

Didier Barvaux didie.nosp@m.r.ba.nosp@m.rvaux.nosp@m.@tou.nosp@m.louse.nosp@m..viv.nosp@m.eris..nosp@m.com

Didier Barvaux didie.nosp@m.r@ba.nosp@m.rvaux.nosp@m..org

Function Documentation

ip_detect_packet_type()

rohc_packet_t ip_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 IP-based non-RTP profiles.

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

ip_parse_dynamic_ip()

int ip_parse_dynamic_ip	(	const struct rohc_decomp_ctxt *const	context,
		const uint8_t *	packet,
		const size_t	length,
		struct rohc_extr_bits *const	bits
	)

Parse the IP dynamic part of the ROHC packet.

Parameters

context	The decompression context
packet	The ROHC packet to parse
length	The length of the ROHC packet
bits	OUT: The bits extracted from the ROHC header

Returns

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

ip_parse_ext3()

int ip_parse_ext3	(	const struct rohc_decomp_ctxt *const	context,
		const uint8_t *const	rohc_data,
		const size_t	rohc_data_len,
		const rohc_packet_t	packet_type,
		struct rohc_extr_bits *const	bits
	)

Parse the extension 3 of the UOR-2 packet.

 Extension 3 for non-RTP profiles (5.7.5 & 5.11.4):

       0     1     2     3     4     5     6     7
    +-----+-----+-----+-----+-----+-----+-----+-----+
 1  |  1     1  |  S  |   Mode    |  I  | ip  | ip2 |
    +-----+-----+-----+-----+-----+-----+-----+-----+
 2  |            Inner IP header flags        |     |  if ip = 1
    +-----+-----+-----+-----+-----+-----+-----+-----+
 3  |            Outer IP header flags              |  if ip2 = 1
    +-----+-----+-----+-----+-----+-----+-----+-----+
 4  |                      SN                       |  if S = 1
    +-----+-----+-----+-----+-----+-----+-----+-----+
    |                                               |
 5  /            Inner IP header fields             /  variable,
    |                                               |  if ip = 1
    +-----+-----+-----+-----+-----+-----+-----+-----+
 6  |                     IP-ID                     |  2 octets, if I = 1
    +-----+-----+-----+-----+-----+-----+-----+-----+
    |                                               |
 7  /            Outer IP header fields             /  variable,
    |                                               |  if ip2 = 1
    +-----+-----+-----+-----+-----+-----+-----+-----+

Parameters

context	The decompression context
rohc_data	The ROHC data to parse
rohc_data_len	The length of the ROHC data to parse
packet_type	The type of ROHC packet to parse
bits	IN: the bits already found in base header OUT: the bits found in the extension header 3

Returns

The data length read from the ROHC packet, -1 in case of error

parse_inner_header_flags()

int parse_inner_header_flags	(	const struct rohc_decomp_ctxt *const	context,
		const uint8_t *const	flags,
		const uint8_t *	fields,
		const size_t	length,
		struct rohc_extr_ip_bits *const	bits
	)

Parse the inner IP header flags and fields.

Store the values in an IP header info structure.

  Inner IP header flags (5.7.5):

       0     1     2     3     4     5     6     7
     ..... ..... ..... ..... ..... ..... ..... .....
    | TOS | TTL | DF  | PR  | IPX | NBO | RND | ip2 |  if ip = 1
     ..... ..... ..... ..... ..... ..... ..... .....

  Inner IP header fields (5.7.5):

    ..... ..... ..... ..... ..... ..... ..... .....
   |         Type of Service/Traffic Class         |  if TOS = 1
    ..... ..... ..... ..... ..... ..... ..... .....
   |         Time to Live/Hop Limit                |  if TTL = 1
    ..... ..... ..... ..... ..... ..... ..... .....
   |         Protocol/Next Header                  |  if PR = 1
    ..... ..... ..... ..... ..... ..... ..... .....
   /         IP extension headers                  /  variable,
    ..... ..... ..... ..... ..... ..... ..... .....   if IPX = 1

Parameters

context	The decompression context
flags	The ROHC flags that indicate which IP fields are present in the packet
fields	The ROHC packet part that contains some IP header fields
length	The length of the ROHC packet part that contains some IP header fields
bits	OUT: The bits extracted from extension 3

Returns

The data length read from the ROHC packet, -1 in case of error

parse_outer_header_flags()

int parse_outer_header_flags	(	const struct rohc_decomp_ctxt *const	context,
		const uint8_t *const	flags,
		const uint8_t *	fields,
		const size_t	length,
		struct rohc_extr_ip_bits *const	bits
	)

Parse the outer IP header flags and fields.

Store the values in an IP header info structure.

  Outer IP header flags (5.7.5):

       0     1     2     3     4     5     6     7
     ..... ..... ..... ..... ..... ..... ..... .....
    | TOS2| TTL2| DF2 | PR2 |IPX2 |NBO2 |RND2 |  I2 |  if ip2 = 1
     ..... ..... ..... ..... ..... ..... ..... .....

  Outer IP header fields

     ..... ..... ..... ..... ..... ..... ..... .....
    |      Type of Service/Traffic Class            |  if TOS2 = 1
     ..... ..... ..... ..... ..... ..... ..... .....
    |         Time to Live/Hop Limit                |  if TTL2 = 1
     ..... ..... ..... ..... ..... ..... ..... .....
    |         Protocol/Next Header                  |  if PR2 = 1
     ..... ..... ..... ..... ..... ..... ..... .....
    /         IP extension header(s)                /  variable,
     ..... ..... ..... ..... ..... ..... ..... .....    if IPX2 = 1
    |                  IP-ID                        |  2 octets,
     ..... ..... ..... ..... ..... ..... ..... .....    if I2 = 1

Parameters

context	The decompression context
flags	The ROHC flags that indicate which IP fields are present in the packet
fields	The ROHC packet part that contain some IP header fields
length	The length of the ROHC packet part that contains some IP header fields
bits	OUT: The bits extracted from extension 3

Returns

The data length read from the ROHC packet, -1 in case of error