decomp_rfc5225_ip_udp.c File Reference

ROHC decompression context for the ROHCv2 IP/UDP profile. More...

#include "rohc_decomp.h"
#include "rohc_decomp_internals.h"
#include "rohc_traces_internal.h"
#include "rohc_decomp_detect_packet.h"
#include "protocols/ip_numbers.h"
#include "protocols/ip.h"
#include "protocols/rfc5225.h"
#include "schemes/ip_ctxt.h"
#include "schemes/decomp_wlsb.h"
#include "schemes/decomp_crc.h"
#include "schemes/rfc4996.h"
#include "rohc_bit_ops.h"
#include "crc.h"
#include "rohc_debug.h"
#include "interval.h"
#include <string.h>

Include dependency graph for decomp_rfc5225_ip_udp.c:

Data Structures
struct	rohc_decomp_rfc5225_ip_udp_ctxt
struct	rohc_rfc5225_ip_bits
struct	rohc_rfc5225_bits
struct	rohc_rfc5225_decoded_ip
struct	rohc_rfc5225_decoded

Functions
static bool	decomp_rfc5225_ip_udp_new_context (const struct rohc_decomp_ctxt *const context, void **const persist_ctxt, struct rohc_decomp_volat_ctxt *const volat_ctxt)
	Create the ROHCv2 IP/UDP volatile and persistent parts of the context. More...
static void	decomp_rfc5225_ip_udp_free_context (struct rohc_decomp_rfc5225_ip_udp_ctxt *const rfc5225_ctxt, const struct rohc_decomp_volat_ctxt *const volat_ctxt)
	Destroy profile-specific data, nothing to destroy for the ROHCv2 IP/UDP profile. More...
static rohc_packet_t	decomp_rfc5225_ip_udp_detect_pkt_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 ROHCv2 IP/UDP profile. More...
static bool	decomp_rfc5225_ip_udp_parse_pkt (const struct rohc_decomp_ctxt *const context, const struct rohc_buf rohc_packet, const size_t large_cid_len, rohc_packet_t *const packet_type, struct rohc_decomp_crc *const extr_crc, struct rohc_rfc5225_bits *const bits, size_t *const rohc_hdr_len)
	Parse one ROHC packet for the ROHCv2 IP/UDP profile. More...
static void	decomp_rfc5225_ip_udp_reset_extr_bits (const struct rohc_decomp_ctxt *const ctxt, struct rohc_rfc5225_bits *const bits)
	Reset the extracted bits for next parsing. More...
static bool	decomp_rfc5225_ip_udp_parse_ir (const struct rohc_decomp_ctxt *const ctxt, const struct rohc_buf rohc_pkt, const size_t large_cid_len, struct rohc_decomp_crc *const extr_crc, struct rohc_rfc5225_bits *const bits, size_t *const rohc_hdr_len)
	Parse one IR packet for the ROHCv2 IP/UDP profile. More...
static bool	decomp_rfc5225_ip_udp_parse_co_repair (const struct rohc_decomp_ctxt *const ctxt, const struct rohc_buf rohc_pkt, const size_t large_cid_len, struct rohc_decomp_crc *const hdr_crc, struct rohc_rfc5225_bits *const bits, size_t *const rohc_hdr_len)
	Parse one co_repair packet for the ROHCv2 IP/UDP profile. More...
static bool	decomp_rfc5225_ip_udp_parse_co (const struct rohc_decomp_ctxt *const ctxt, const struct rohc_buf rohc_pkt, const size_t large_cid_len, const rohc_packet_t packet_type, struct rohc_decomp_crc *const extr_crc, struct rohc_rfc5225_bits *const bits, size_t *const rohc_hdr_len)
	Parse CO packet for the ROHCv2 IP/UDP profile. More...
static bool	decomp_rfc5225_ip_udp_parse_pt_0_crc3 (const struct rohc_decomp_ctxt *const ctxt, const uint8_t *const rohc_pkt, const size_t rohc_len, struct rohc_decomp_crc *const extr_crc, struct rohc_rfc5225_bits *const bits, size_t *const rohc_hdr_len)
	Parse one pt_0_crc3 packet for the ROHCv2 IP/UDP profile. More...
static bool	decomp_rfc5225_ip_udp_parse_pt_0_crc7 (const struct rohc_decomp_ctxt *const ctxt, const uint8_t *const rohc_pkt, const size_t rohc_len, struct rohc_decomp_crc *const extr_crc, struct rohc_rfc5225_bits *const bits, size_t *const rohc_hdr_len)
	Parse one pt_0_crc7 packet for the ROHCv2 IP/UDP profile. More...
static bool	decomp_rfc5225_ip_udp_parse_pt_1_seq_id (const struct rohc_decomp_ctxt *const ctxt, const uint8_t *const rohc_pkt, const size_t rohc_len, struct rohc_decomp_crc *const extr_crc, struct rohc_rfc5225_bits *const bits, size_t *const rohc_hdr_len)
	Parse one pt_1_seq_id packet for the ROHCv2 IP/UDP profile. More...
static bool	decomp_rfc5225_ip_udp_parse_pt_2_seq_id (const struct rohc_decomp_ctxt *const ctxt, const uint8_t *const rohc_pkt, const size_t rohc_len, struct rohc_decomp_crc *const extr_crc, struct rohc_rfc5225_bits *const bits, size_t *const rohc_hdr_len)
	Parse one pt_2_seq_id packet for the ROHCv2 IP/UDP profile. More...
static bool	decomp_rfc5225_ip_udp_parse_co_common (const struct rohc_decomp_ctxt *const ctxt, const uint8_t *const rohc_pkt, const size_t rohc_len, struct rohc_decomp_crc *const extr_crc, struct rohc_rfc5225_bits *const bits, size_t *const rohc_hdr_len)
	Parse one co_common packet for the ROHCv2 IP/UDP profile. More...
static bool	decomp_rfc5225_ip_udp_parse_static_chain (const struct rohc_decomp_ctxt *const ctxt, const uint8_t *const rohc_pkt, const size_t rohc_len, struct rohc_rfc5225_bits *const bits, size_t *const parsed_len)
	Parse the static chain of the IR packet. More...
static int	decomp_rfc5225_ip_udp_parse_static_ip (const struct rohc_decomp_ctxt *const ctxt, const uint8_t *const rohc_pkt, const size_t rohc_len, struct rohc_rfc5225_ip_bits *const ip_bits, bool *const is_innermost)
	Decode the static IP header of the ROHC packet. More...
static int	decomp_rfc5225_ip_udp_parse_static_udp (const struct rohc_decomp_ctxt *const ctxt, const uint8_t *rohc_pkt, const size_t rohc_len, struct rohc_rfc5225_bits *const bits)
	Parse the UDP static part of the ROHC packet. More...
static bool	decomp_rfc5225_ip_udp_parse_dyn_chain (const struct rohc_decomp_ctxt *const ctxt, const uint8_t *const rohc_pkt, const size_t rohc_len, struct rohc_rfc5225_bits *const bits, size_t *const parsed_len)
	Parse the dynamic chain of the IR packet. More...
static int	decomp_rfc5225_ip_udp_parse_dyn_ip (const struct rohc_decomp_ctxt *const ctxt, const uint8_t *const rohc_pkt, const size_t rohc_len, struct rohc_rfc5225_ip_bits *const ip_bits)
	Decode the dynamic IP header of the ROHC packet. More...
static int	decomp_rfc5225_ip_udp_parse_dyn_udp (const struct rohc_decomp_ctxt *const ctxt, const uint8_t *rohc_pkt, const size_t rohc_len, struct rohc_rfc5225_bits *const bits)
	Parse the UDP dynamic part of the ROHC packet. More...
static bool	decomp_rfc5225_ip_udp_parse_irreg_chain (const struct rohc_decomp_ctxt *const ctxt, const uint8_t *const rohc_pkt, const size_t rohc_len, const rohc_ip_id_behavior_t innermost_ip_id_behavior, struct rohc_rfc5225_bits *const bits, size_t *const parsed_len)
	Parse the irregular chain of the CO packet. More...
static int	decomp_rfc5225_ip_udp_parse_irreg_ip (const struct rohc_decomp_ctxt *const ctxt, const uint8_t *const rohc_pkt, const size_t rohc_len, const bool is_innermost, const rohc_ip_id_behavior_t ip_id_behavior, const bool outer_ip_flag, struct rohc_rfc5225_ip_bits *const ip_bits)
	Decode the irregular IP header of the ROHC packet. More...
static int	decomp_rfc5225_ip_udp_parse_irreg_udp (const struct rohc_decomp_ctxt *const ctxt, const uint8_t *rohc_pkt, const size_t rohc_len, struct rohc_rfc5225_bits *const bits)
	Parse the UDP dynamic part of the ROHC packet. More...
static rohc_status_t	decomp_rfc5225_ip_udp_decode_bits (const struct rohc_decomp_ctxt *const ctxt, const struct rohc_rfc5225_bits *const bits, const size_t payload_len, struct rohc_rfc5225_decoded *const decoded)
	Decode values from extracted bits for the ROHCv2 IP/UDP profile. More...
static bool	decomp_rfc5225_ip_udp_decode_bits_ip_hdrs (const struct rohc_decomp_ctxt *const ctxt, const struct rohc_rfc5225_bits *const bits, struct rohc_rfc5225_decoded *const decoded)
	Decode values for all IP headers from extracted bits. More...
static bool	decomp_rfc5225_ip_udp_decode_bits_ip_hdr (const struct rohc_decomp_ctxt *const ctxt, const struct rohc_rfc5225_ip_bits *const ip_bits, const ip_context_t *const ip_ctxt, const uint16_t decoded_msn, struct rohc_rfc5225_decoded_ip *const ip_decoded)
	Decode values for one IP header from extracted bits. More...
static rohc_status_t	decomp_rfc5225_ip_udp_build_hdrs (const struct rohc_decomp *const decomp, const struct rohc_decomp_ctxt *const context, const rohc_packet_t packet_type, const struct rohc_decomp_crc *const extr_crc, const struct rohc_rfc5225_decoded *const decoded, const size_t payload_len, struct rohc_buf *const uncomp_hdrs, size_t *const uncomp_hdrs_len)
	Build the uncompressed headers for the ROHCv2 IP/UDP profile. More...
static bool	decomp_rfc5225_ip_udp_build_ip_hdrs (const struct rohc_decomp_ctxt *const ctxt, const struct rohc_rfc5225_decoded *const decoded, struct rohc_buf *const uncomp_pkt, size_t *const ip_hdrs_len)
	Build all of the uncompressed IP headers. More...
static bool	decomp_rfc5225_ip_udp_build_ip_hdr (const struct rohc_decomp_ctxt *const ctxt, const struct rohc_rfc5225_decoded_ip *const decoded, struct rohc_buf *const uncomp_pkt, size_t *const ip_hdr_len)
	Build one single uncompressed IP header. More...
static bool	decomp_rfc5225_ip_udp_build_ipv4_hdr (const struct rohc_decomp_ctxt *const ctxt, const struct rohc_rfc5225_decoded_ip *const decoded, struct rohc_buf *const uncomp_pkt, size_t *const ip_hdr_len)
	Build one single uncompressed IPv4 header. More...
static bool	decomp_rfc5225_ip_udp_build_ipv6_hdr (const struct rohc_decomp_ctxt *const ctxt, const struct rohc_rfc5225_decoded_ip *const decoded, struct rohc_buf *const uncomp_pkt, size_t *const ip_hdr_len)
	Build one single uncompressed IPv6 header. More...
static bool	decomp_rfc5225_ip_udp_build_udp_hdr (const struct rohc_decomp_ctxt *const ctxt, const struct rohc_rfc5225_decoded *const decoded, const size_t payload_len, struct rohc_buf *const uncomp_pkt, size_t *const udp_hdr_len)
	Build the uncompressed UDP header. More...
static void	decomp_rfc5225_ip_udp_update_ctxt (struct rohc_decomp_ctxt *const context, const struct rohc_rfc5225_decoded *const decoded, const size_t payload_len, bool *const do_change_mode)
	Update the decompression context with the infos of current packet. More...
static bool	decomp_rfc5225_ip_udp_attempt_repair (const struct rohc_decomp *const decomp, const struct rohc_decomp_ctxt *const context, const struct rohc_ts pkt_arrival_time, struct rohc_decomp_crc_corr_ctxt *const crc_corr, void *const extr_bits)
	Attempt a packet/context repair upon CRC failure. More...
static uint32_t	decomp_rfc5225_ip_udp_get_sn (const struct rohc_decomp_ctxt *const context)
	Get the reference SN value of the context. More...

Variables
const struct rohc_decomp_profile	rohc_decomp_rfc5225_ip_udp_profile
	Define the decompression part of the ROHCv2 IP/UDP profile as described in the RFC 5225. More...

Detailed Description

ROHC decompression context for the ROHCv2 IP/UDP 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

decomp_rfc5225_ip_udp_attempt_repair()

static bool decomp_rfc5225_ip_udp_attempt_repair ( const struct rohc_decomp *const  decomp, const struct rohc_decomp_ctxt *const  context, const struct rohc_ts  pkt_arrival_time, struct rohc_decomp_crc_corr_ctxt *const  crc_corr, void *const  extr_bits  )

static

Attempt a packet/context repair upon CRC failure.

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
	pkt_arrival_time	The arrival time of the ROHC packet that caused the CRC failure
[in,out]	crc_corr	The context for corrections upon CRC failures
[in,out]	extr_bits	The bits extracted from the ROHC header

Returns

true if repair is possible, false if not

decomp_rfc5225_ip_udp_build_hdrs()

static rohc_status_t decomp_rfc5225_ip_udp_build_hdrs ( const struct rohc_decomp *const  decomp, const struct rohc_decomp_ctxt *const  context, const rohc_packet_t  packet_type, const struct rohc_decomp_crc *const  extr_crc, const struct rohc_rfc5225_decoded *const  decoded, const size_t  payload_len, struct rohc_buf *const  uncomp_hdrs, size_t *const  uncomp_hdrs_len  )

static

Build the uncompressed headers for the ROHCv2 IP/UDP 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
	packet_type	The type of ROHC packet
	extr_crc	The CRC bits extracted from the ROHC header
	decoded	The values decoded from ROHC header
	payload_len	The length of the packet payload (in bytes)
[out]	uncomp_hdrs	The uncompressed headers being built
[out]	uncomp_hdrs_len	The length of the uncompressed headers written into the buffer

Returns

Possible values:

• ROHC_STATUS_OK if headers are built successfully,
• ROHC_STATUS_OUTPUT_TOO_SMALL if uncomp_packet is too small

decomp_rfc5225_ip_udp_build_ip_hdr()

static bool decomp_rfc5225_ip_udp_build_ip_hdr ( const struct rohc_decomp_ctxt *const  ctxt, const struct rohc_rfc5225_decoded_ip *const  decoded, struct rohc_buf *const  uncomp_pkt, size_t *const  ip_hdr_len  )

static

Build one single uncompressed IP header.

Build one single uncompressed IP header - IPv4 or IPv6 - from the context and packet information.

Parameters

	ctxt	The decompression context
	decoded	The values decoded from the ROHC packet
[out]	uncomp_pkt	The uncompressed packet being built
[out]	ip_hdr_len	The length of the IP header (in bytes)

Returns

true if IP header was successfully built, false if the output uncomp_packet was not large enough

decomp_rfc5225_ip_udp_build_ip_hdrs()

static bool decomp_rfc5225_ip_udp_build_ip_hdrs ( const struct rohc_decomp_ctxt *const  ctxt, const struct rohc_rfc5225_decoded *const  decoded, struct rohc_buf *const  uncomp_pkt, size_t *const  ip_hdrs_len  )

static

Build all of the uncompressed IP headers.

Build all of the uncompressed IP headers - IPv4 or IPv6 - from the context and packet information.

Parameters

	ctxt	The decompression context
	decoded	The values decoded from the ROHC packet
[out]	uncomp_pkt	The uncompressed packet being built
[out]	ip_hdrs_len	The length of all the IP headers (in bytes)

Returns

true if IP headers were successfully built, false if the output uncomp_packet was not large enough

decomp_rfc5225_ip_udp_build_ipv4_hdr()

static bool decomp_rfc5225_ip_udp_build_ipv4_hdr ( const struct rohc_decomp_ctxt *const  ctxt, const struct rohc_rfc5225_decoded_ip *const  decoded, struct rohc_buf *const  uncomp_pkt, size_t *const  ip_hdr_len  )

static

Build one single uncompressed IPv4 header.

Build one single uncompressed IPv4 header from the context and packet information.

Parameters

	ctxt	The decompression context
	decoded	The values decoded from the ROHC packet
[out]	uncomp_pkt	The uncompressed packet being built
[out]	ip_hdr_len	The length of the IPv4 header (in bytes)

Returns

true if IPv4 header was successfully built, false if the output uncomp_packet was not large enough

decomp_rfc5225_ip_udp_build_ipv6_hdr()

static bool decomp_rfc5225_ip_udp_build_ipv6_hdr ( const struct rohc_decomp_ctxt *const  ctxt, const struct rohc_rfc5225_decoded_ip *const  decoded, struct rohc_buf *const  uncomp_pkt, size_t *const  ip_hdr_len  )

static

Build one single uncompressed IPv6 header.

Build one single uncompressed IPv6 header - including IPv6 extension headers - from the context and packet information.

Parameters

	ctxt	The decompression context
	decoded	The values decoded from the ROHC packet
[out]	uncomp_pkt	The uncompressed packet being built
[out]	ip_hdr_len	The length of the IPv6 header (in bytes)

Returns

true if IPv6 header was successfully built, false if the output uncomp_packet was not large enough

decomp_rfc5225_ip_udp_build_udp_hdr()

static bool decomp_rfc5225_ip_udp_build_udp_hdr ( const struct rohc_decomp_ctxt *const  ctxt, const struct rohc_rfc5225_decoded *const  decoded, const size_t  payload_len, struct rohc_buf *const  uncomp_pkt, size_t *const  udp_hdr_len  )

static

Build the uncompressed UDP header.

Build the uncompressed UDP header from the context and packet information.

Parameters

	ctxt	The decompression context
	decoded	The values decoded from the ROHC packet
	payload_len	The length (in bytes) of the payload
[out]	uncomp_pkt	The uncompressed packet being built
[out]	udp_hdr_len	The length of the UDP header (in bytes)

Returns

true if UDP header was successfully built, false if the output uncomp_packet was not large enough

decomp_rfc5225_ip_udp_decode_bits()

static rohc_status_t decomp_rfc5225_ip_udp_decode_bits ( const struct rohc_decomp_ctxt *const  ctxt, const struct rohc_rfc5225_bits *const  bits, const size_t  payload_len, struct rohc_rfc5225_decoded *const  decoded  )

static

Decode values from extracted bits for the ROHCv2 IP/UDP profile.

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

Parameters

	ctxt	The decompression context
	bits	The bits extracted from the ROHC packet
	payload_len	The length of the packet payload (in bytes)
[out]	decoded	The corresponding decoded values

Returns

ROHC_STATUS_OK if decoding is successful, ROHC_STATUS_BAD_CRC if control CRC is wrong, ROHC_STATUS_ERROR otherwise

decomp_rfc5225_ip_udp_decode_bits_ip_hdr()

static bool decomp_rfc5225_ip_udp_decode_bits_ip_hdr ( const struct rohc_decomp_ctxt *const  ctxt, const struct rohc_rfc5225_ip_bits *const  ip_bits, const ip_context_t *const  ip_ctxt, const uint16_t  decoded_msn, struct rohc_rfc5225_decoded_ip *const  ip_decoded  )

static

Decode values for one IP header from extracted bits.

Parameters

	ctxt	The decompression context
	ip_bits	The IP bits extracted from the ROHC packet
	ip_ctxt	The IP values recorded in context
	decoded_msn	The decoded Master Sequence Number (MSN)
[out]	ip_decoded	The corresponding decoded IP values

Returns

true if decoding is successful, false otherwise

TODO: factorize with TCP profile

decomp_rfc5225_ip_udp_decode_bits_ip_hdrs()

static bool decomp_rfc5225_ip_udp_decode_bits_ip_hdrs ( const struct rohc_decomp_ctxt *const  ctxt, const struct rohc_rfc5225_bits *const  bits, struct rohc_rfc5225_decoded *const  decoded  )

static

Decode values for all IP headers from extracted bits.

Parameters

	ctxt	The decompression context
	bits	The bits extracted from the ROHC packet
[out]	decoded	The corresponding decoded values

Returns

true if decoding is successful, false otherwise

decomp_rfc5225_ip_udp_detect_pkt_type()

static rohc_packet_t decomp_rfc5225_ip_udp_detect_pkt_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 ROHCv2 IP/UDP profile.

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

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

decomp_rfc5225_ip_udp_free_context()

static void decomp_rfc5225_ip_udp_free_context ( struct rohc_decomp_rfc5225_ip_udp_ctxt *const  rfc5225_ctxt, const struct rohc_decomp_volat_ctxt *const  volat_ctxt  )

static

Destroy profile-specific data, nothing to destroy for the ROHCv2 IP/UDP profile.

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

Parameters

rfc5225_ctxt	The persistent decompression context for the IP/UDP profile
volat_ctxt	The volatile part of the decompression context

decomp_rfc5225_ip_udp_get_sn()

static uint32_t decomp_rfc5225_ip_udp_get_sn ( const struct rohc_decomp_ctxt *const  context )

static

Get the reference SN value of the context.

Always return 0 for the ROHCv2 IP/UDP profile.

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 SN value

decomp_rfc5225_ip_udp_new_context()

static bool decomp_rfc5225_ip_udp_new_context ( const struct rohc_decomp_ctxt *const  context, void **const  persist_ctxt, struct rohc_decomp_volat_ctxt *const  volat_ctxt  )

static

Create the ROHCv2 IP/UDP volatile and persistent parts 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
[out]	persist_ctxt	The persistent part of the decompression context
[out]	volat_ctxt	The volatile part of the decompression context

Returns

true if the ROHCv2 IP/UDP context was successfully created, false if a problem occurred

decomp_rfc5225_ip_udp_parse_co()

static bool decomp_rfc5225_ip_udp_parse_co ( const struct rohc_decomp_ctxt *const  ctxt, const struct rohc_buf  rohc_pkt, const size_t  large_cid_len, const rohc_packet_t  packet_type, struct rohc_decomp_crc *const  extr_crc, struct rohc_rfc5225_bits *const  bits, size_t *const  rohc_hdr_len  )

static

Parse CO packet for the ROHCv2 IP/UDP profile.

Parameters

	ctxt	The decompression context
	rohc_pkt	The ROHC packet to decode
	large_cid_len	The length of the optional large CID field
	packet_type	The type of the ROHC packet to parse
[out]	extr_crc	The CRC extracted from the ROHC packet
[out]	bits	The bits extracted from the ROHC packet
[out]	rohc_hdr_len	The length of the ROHC header (in bytes)

Returns

true if parsing was successful, false if packet was malformed

decomp_rfc5225_ip_udp_parse_co_common()

static bool decomp_rfc5225_ip_udp_parse_co_common ( const struct rohc_decomp_ctxt *const  ctxt, const uint8_t *const  rohc_pkt, const size_t  rohc_len, struct rohc_decomp_crc *const  extr_crc, struct rohc_rfc5225_bits *const  bits, size_t *const  rohc_hdr_len  )

static

Parse one co_common packet for the ROHCv2 IP/UDP profile.

Parameters

	ctxt	The decompression context
	rohc_pkt	The ROHC packet to decode
	rohc_len	The length (in bytes) of the ROHC packet
[out]	extr_crc	The CRC extracted from the ROHC packet
[out]	bits	The bits extracted from the ROHC packet
[out]	rohc_hdr_len	The length of the ROHC header (in bytes)

Returns

true if parsing was successful, false if packet was malformed

decomp_rfc5225_ip_udp_parse_co_repair()

static bool decomp_rfc5225_ip_udp_parse_co_repair ( const struct rohc_decomp_ctxt *const  ctxt, const struct rohc_buf  rohc_pkt, const size_t  large_cid_len, struct rohc_decomp_crc *const  hdr_crc, struct rohc_rfc5225_bits *const  bits, size_t *const  rohc_hdr_len  )

static

Parse one co_repair packet for the ROHCv2 IP/UDP profile.

Parameters

	ctxt	The decompression context
	rohc_pkt	The ROHC packet to decode
	large_cid_len	The length of the optional large CID field
[out]	hdr_crc	The CRC over uncomp headers extracted from ROHC packet
[out]	bits	The bits extracted from the ROHC packet
[out]	rohc_hdr_len	The length of the ROHC header (in bytes)

Returns

true if parsing was successful, false if packet was malformed

decomp_rfc5225_ip_udp_parse_dyn_chain()

static bool decomp_rfc5225_ip_udp_parse_dyn_chain ( const struct rohc_decomp_ctxt *const  ctxt, const uint8_t *const  rohc_pkt, const size_t  rohc_len, struct rohc_rfc5225_bits *const  bits, size_t *const  parsed_len  )

static

Parse the dynamic chain of the IR packet.

Parameters

	ctxt	The decompression context
	rohc_pkt	The remaining part of the ROHC packet
	rohc_len	The remaining length (in bytes) of the ROHC packet
[out]	parsed_len	The length (in bytes) of static chain in case of success
[out]	bits	The bits extracted from the dynamic chain

Returns

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

decomp_rfc5225_ip_udp_parse_dyn_ip()

static int decomp_rfc5225_ip_udp_parse_dyn_ip ( const struct rohc_decomp_ctxt *const  ctxt, const uint8_t *const  rohc_pkt, const size_t  rohc_len, struct rohc_rfc5225_ip_bits *const  ip_bits  )

static

Decode the dynamic IP header of the ROHC packet.

Parameters

	ctxt	The decompression context
	rohc_pkt	The remaining part of the ROHC packet
	rohc_len	The remaining length (in bytes) of the ROHC packet
[out]	ip_bits	The bits extracted from the IP part of the dynamic chain

Returns

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

decomp_rfc5225_ip_udp_parse_dyn_udp()

static int decomp_rfc5225_ip_udp_parse_dyn_udp ( const struct rohc_decomp_ctxt *const  ctxt, const uint8_t *  rohc_pkt, const size_t  rohc_len, struct rohc_rfc5225_bits *const  bits  )

static

Parse the UDP dynamic part of the ROHC packet.

Parameters

ctxt	The decompression context
rohc_pkt	The ROHC packet to decode
rohc_len	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

decomp_rfc5225_ip_udp_parse_ir()

static bool decomp_rfc5225_ip_udp_parse_ir ( const struct rohc_decomp_ctxt *const  ctxt, const struct rohc_buf  rohc_pkt, const size_t  large_cid_len, struct rohc_decomp_crc *const  extr_crc, struct rohc_rfc5225_bits *const  bits, size_t *const  rohc_hdr_len  )

static

Parse one IR packet for the ROHCv2 IP/UDP profile.

Parameters

	ctxt	The decompression context
	rohc_pkt	The ROHC packet to decode
	large_cid_len	The length of the optional large CID field
[out]	extr_crc	The CRC extracted from the ROHC packet
[out]	bits	The bits extracted from the ROHC packet
[out]	rohc_hdr_len	The length of the ROHC header (in bytes)

Returns

true if parsing was successful, false if packet was malformed

decomp_rfc5225_ip_udp_parse_irreg_chain()

static bool decomp_rfc5225_ip_udp_parse_irreg_chain ( const struct rohc_decomp_ctxt *const  ctxt, const uint8_t *const  rohc_pkt, const size_t  rohc_len, const rohc_ip_id_behavior_t  innermost_ip_id_behavior, struct rohc_rfc5225_bits *const  bits, size_t *const  parsed_len  )

static

Parse the irregular chain of the CO packet.

Parameters

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

Returns

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

decomp_rfc5225_ip_udp_parse_irreg_ip()

static int decomp_rfc5225_ip_udp_parse_irreg_ip ( const struct rohc_decomp_ctxt *const  ctxt, const uint8_t *const  rohc_pkt, const size_t  rohc_len, const bool  is_innermost, const rohc_ip_id_behavior_t  ip_id_behavior, const bool  outer_ip_flag, struct rohc_rfc5225_ip_bits *const  ip_bits  )

static

Decode the irregular IP header of the ROHC packet.

Parameters

	ctxt	The decompression context
	rohc_pkt	The remaining part of the ROHC packet
	rohc_len	The remaining length (in bytes) of the ROHC packet
	is_innermost	Whether the IP header is the innermost IP header or not
	ip_id_behavior	The IP-ID behavior of the IP header (may be different from the context)
	outer_ip_flag	Whether the TOS/TC or TTL/HL fields of outer IP headers are present or not
[out]	ip_bits	The bits extracted from the IP part of the irregular chain

Returns

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

decomp_rfc5225_ip_udp_parse_irreg_udp()

static int decomp_rfc5225_ip_udp_parse_irreg_udp ( const struct rohc_decomp_ctxt *const  ctxt, const uint8_t *  rohc_pkt, const size_t  rohc_len, struct rohc_rfc5225_bits *const  bits  )

static

Parse the UDP dynamic part of the ROHC packet.

Parameters

ctxt	The decompression context
rohc_pkt	The ROHC packet to decode
rohc_len	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

decomp_rfc5225_ip_udp_parse_pkt()

static bool decomp_rfc5225_ip_udp_parse_pkt ( const struct rohc_decomp_ctxt *const  context, const struct rohc_buf  rohc_packet, const size_t  large_cid_len, rohc_packet_t *const  packet_type, struct rohc_decomp_crc *const  extr_crc, struct rohc_rfc5225_bits *const  bits, size_t *const  rohc_hdr_len  )

static

Parse one ROHC packet for the ROHCv2 IP/UDP profile.

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

Parameters

	context	The decompression context
	rohc_packet	The ROHC packet to parse
	large_cid_len	The length of the optional large CID field
[in,out]	packet_type	IN: The type of the ROHC packet to parse OUT: The type of the parsed ROHC packet
[out]	extr_crc	The CRC bits extracted from the ROHC packet
[out]	bits	The bits extracted from the ROHC packet
[out]	rohc_hdr_len	The length of the ROHC header (in bytes)

Returns

true if parsing was successful, false if packet was malformed

decomp_rfc5225_ip_udp_parse_pt_0_crc3()

static bool decomp_rfc5225_ip_udp_parse_pt_0_crc3 ( const struct rohc_decomp_ctxt *const  ctxt, const uint8_t *const  rohc_pkt, const size_t  rohc_len, struct rohc_decomp_crc *const  extr_crc, struct rohc_rfc5225_bits *const  bits, size_t *const  rohc_hdr_len  )

static

Parse one pt_0_crc3 packet for the ROHCv2 IP/UDP profile.

Parameters

	ctxt	The decompression context
	rohc_pkt	The ROHC packet to decode
	rohc_len	The length (in bytes) of the ROHC packet
[out]	extr_crc	The CRC extracted from the ROHC packet
[out]	bits	The bits extracted from the ROHC packet
[out]	rohc_hdr_len	The length of the ROHC header (in bytes)

Returns

true if parsing was successful, false if packet was malformed

decomp_rfc5225_ip_udp_parse_pt_0_crc7()

static bool decomp_rfc5225_ip_udp_parse_pt_0_crc7 ( const struct rohc_decomp_ctxt *const  ctxt, const uint8_t *const  rohc_pkt, const size_t  rohc_len, struct rohc_decomp_crc *const  extr_crc, struct rohc_rfc5225_bits *const  bits, size_t *const  rohc_hdr_len  )

static

Parse one pt_0_crc7 packet for the ROHCv2 IP/UDP profile.

Parameters

	ctxt	The decompression context
	rohc_pkt	The ROHC packet to decode
	rohc_len	The length (in bytes) of the ROHC packet
[out]	extr_crc	The CRC extracted from the ROHC packet
[out]	bits	The bits extracted from the ROHC packet
[out]	rohc_hdr_len	The length of the ROHC header (in bytes)

Returns

true if parsing was successful, false if packet was malformed

decomp_rfc5225_ip_udp_parse_pt_1_seq_id()

static bool decomp_rfc5225_ip_udp_parse_pt_1_seq_id ( const struct rohc_decomp_ctxt *const  ctxt, const uint8_t *const  rohc_pkt, const size_t  rohc_len, struct rohc_decomp_crc *const  extr_crc, struct rohc_rfc5225_bits *const  bits, size_t *const  rohc_hdr_len  )

static

Parse one pt_1_seq_id packet for the ROHCv2 IP/UDP profile.

Parameters

	ctxt	The decompression context
	rohc_pkt	The ROHC packet to decode
	rohc_len	The length (in bytes) of the ROHC packet
[out]	extr_crc	The CRC extracted from the ROHC packet
[out]	bits	The bits extracted from the ROHC packet
[out]	rohc_hdr_len	The length of the ROHC header (in bytes)

Returns

true if parsing was successful, false if packet was malformed

decomp_rfc5225_ip_udp_parse_pt_2_seq_id()

static bool decomp_rfc5225_ip_udp_parse_pt_2_seq_id ( const struct rohc_decomp_ctxt *const  ctxt, const uint8_t *const  rohc_pkt, const size_t  rohc_len, struct rohc_decomp_crc *const  extr_crc, struct rohc_rfc5225_bits *const  bits, size_t *const  rohc_hdr_len  )

static

Parse one pt_2_seq_id packet for the ROHCv2 IP/UDP profile.

Parameters

	ctxt	The decompression context
	rohc_pkt	The ROHC packet to decode
	rohc_len	The length (in bytes) of the ROHC packet
[out]	extr_crc	The CRC extracted from the ROHC packet
[out]	bits	The bits extracted from the ROHC packet
[out]	rohc_hdr_len	The length of the ROHC header (in bytes)

Returns

true if parsing was successful, false if packet was malformed

decomp_rfc5225_ip_udp_parse_static_chain()

static bool decomp_rfc5225_ip_udp_parse_static_chain ( const struct rohc_decomp_ctxt *const  ctxt, const uint8_t *const  rohc_pkt, const size_t  rohc_len, struct rohc_rfc5225_bits *const  bits, size_t *const  parsed_len  )

static

Parse the static chain of the IR packet.

Parameters

	ctxt	The decompression context
	rohc_pkt	The remaining part of the ROHC packet
	rohc_len	The remaining length (in bytes) of the ROHC packet
[out]	bits	The bits extracted from the static chain
[out]	parsed_len	The length (in bytes) of static chain in case of success

Returns

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

decomp_rfc5225_ip_udp_parse_static_ip()

static int decomp_rfc5225_ip_udp_parse_static_ip ( const struct rohc_decomp_ctxt *const  ctxt, const uint8_t *const  rohc_pkt, const size_t  rohc_len, struct rohc_rfc5225_ip_bits *const  ip_bits, bool *const  is_innermost  )

static

Decode the static IP header of the ROHC packet.

Parameters

	ctxt	The decompression context
	rohc_pkt	The remaining part of the ROHC packet
	rohc_len	The remaining length (in bytes) of the ROHC packet
[out]	ip_bits	The bits extracted from the IP part of the static chain
[out]	is_innermost	Whether the IP header is the innermost IP header

Returns

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

decomp_rfc5225_ip_udp_parse_static_udp()

static int decomp_rfc5225_ip_udp_parse_static_udp ( const struct rohc_decomp_ctxt *const  ctxt, const uint8_t *  rohc_pkt, const size_t  rohc_len, struct rohc_rfc5225_bits *const  bits  )

static

Parse the UDP static part of the ROHC packet.

Parameters

ctxt	The decompression context
rohc_pkt	The ROHC packet to decode
rohc_len	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

decomp_rfc5225_ip_udp_reset_extr_bits()

static void decomp_rfc5225_ip_udp_reset_extr_bits ( const struct rohc_decomp_ctxt *const  ctxt, struct rohc_rfc5225_bits *const  bits  )

static

Reset the extracted bits for next parsing.

Parameters

	ctxt	The decompression context
[out]	bits	The extracted bits to reset

decomp_rfc5225_ip_udp_update_ctxt()

static void decomp_rfc5225_ip_udp_update_ctxt ( struct rohc_decomp_ctxt *const  context, const struct rohc_rfc5225_decoded *const  decoded, const size_t  payload_len, bool *const  do_change_mode  )

static

Update the decompression context with the infos of current packet.

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

Parameters

	context	The decompression context
	decoded	The decoded values to update in the context
	payload_len	The length of the packet payload (in bytes)
[out]	do_change_mode	Whether the profile context wants to change its operational mode or not

Variable Documentation

rohc_decomp_rfc5225_ip_udp_profile

const struct rohc_decomp_profile rohc_decomp_rfc5225_ip_udp_profile

Initial value:

=
{
        .id              = ROHCv2_PROFILE_IP_UDP, 
        .msn_max_bits    = 16,
        .new_context     = decomp_rfc5225_ip_udp_new_context,
        .free_context    = (rohc_decomp_free_context_t) decomp_rfc5225_ip_udp_free_context,
        .detect_pkt_type = decomp_rfc5225_ip_udp_detect_pkt_type,
        .parse_pkt       = (rohc_decomp_parse_pkt_t) decomp_rfc5225_ip_udp_parse_pkt,
        .decode_bits     = (rohc_decomp_decode_bits_t) decomp_rfc5225_ip_udp_decode_bits,
        .build_hdrs      = (rohc_decomp_build_hdrs_t) decomp_rfc5225_ip_udp_build_hdrs,
        .update_ctxt     = (rohc_decomp_update_ctxt_t) decomp_rfc5225_ip_udp_update_ctxt,
        .attempt_repair  = (rohc_decomp_attempt_repair_t) decomp_rfc5225_ip_udp_attempt_repair,
        .get_sn          = decomp_rfc5225_ip_udp_get_sn,
}

Define the decompression part of the ROHCv2 IP/UDP profile as described in the RFC 5225.