c_esp.c File Reference

ROHC ESP compression profile. More...

#include "rohc_comp_rfc3095.h"
#include "c_ip.h"
#include "rohc_traces_internal.h"
#include "crc.h"
#include "protocols/esp.h"
#include "rohc_utils.h"
#include <stdbool.h>
#include <string.h>
#include <assert.h>

Include dependency graph for c_esp.c:

Functions
static bool	c_esp_create (struct rohc_comp_ctxt *const context, const struct rohc_pkt_hdrs *const uncomp_pkt_hdrs)
	Create a new ESP context and initialize it thanks to the given IP/ESP packet. More...
static uint32_t	c_esp_get_next_sn (const struct rohc_comp_ctxt *const context, const struct rohc_pkt_hdrs *const uncomp_pkt_hdrs)
	Determine the SN value for the next packet. More...
static size_t	esp_code_static_esp_part (const struct rohc_comp_ctxt *const context, const uint8_t *const next_header, uint8_t *const dest, const size_t counter)
	Build the static part of the ESP header. More...
static size_t	esp_code_dynamic_esp_part (const struct rohc_comp_ctxt *const context, const uint8_t *const next_header, uint8_t *const dest, const size_t counter)
	Build the dynamic part of the ESP header. More...

Variables
const struct rohc_comp_profile	c_esp_profile
	Define the compression part of the ESP profile as described in the RFC 3095. More...

Detailed Description

ROHC ESP compression profile.

Author

FWX rohc_.nosp@m.team.nosp@m.@dial.nosp@m.ine..nosp@m.fr

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

Function Documentation

c_esp_create()

static bool c_esp_create ( struct rohc_comp_ctxt *const  context, const struct rohc_pkt_hdrs *const  uncomp_pkt_hdrs  )

static

Create a new ESP context and initialize it thanks to the given IP/ESP packet.

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

Parameters

context	The compression context
uncomp_pkt_hdrs	The uncompressed headers to initialize the new context

Returns

true if successful, false otherwise

c_esp_get_next_sn()

static uint32_t c_esp_get_next_sn ( const struct rohc_comp_ctxt *const  context, const struct rohc_pkt_hdrs *const  uncomp_pkt_hdrs  )

static

Determine the SN value for the next packet.

Profile SN is the ESP SN.

Parameters

context	The compression context
uncomp_pkt_hdrs	The uncompressed headers to encode

Returns

The SN

esp_code_dynamic_esp_part()

static size_t esp_code_dynamic_esp_part ( const struct rohc_comp_ctxt *const  context, const uint8_t *const  next_header, uint8_t *const  dest, const size_t  counter  )

static

Build the dynamic part of the ESP header.

 Dynamic part of ESP header (5.7.7.7):

    +---+---+---+---+---+---+---+---+
 1  /       Sequence Number         /   4 octets
    +---+---+---+---+---+---+---+---+

Parameters

context	The compression context
next_header	The ESP header
dest	The rohc-packet-under-build buffer
counter	The current position in the rohc-packet-under-build buffer

Returns

The new position in the rohc-packet-under-build buffer

esp_code_static_esp_part()

static size_t esp_code_static_esp_part ( const struct rohc_comp_ctxt *const  context, const uint8_t *const  next_header, uint8_t *const  dest, const size_t  counter  )

static

Build the static part of the ESP header.

 Static part of ESP header (5.7.7.7):

    +---+---+---+---+---+---+---+---+
 1  /              SPI              /   4 octets
    +---+---+---+---+---+---+---+---+

 SPI = Security Parameters Index

Parameters

context	The compression context
next_header	The ESP header
dest	The rohc-packet-under-build buffer
counter	The current position in the rohc-packet-under-build buffer

Returns

The new position in the rohc-packet-under-build buffer

Variable Documentation

c_esp_profile

const struct rohc_comp_profile c_esp_profile

Initial value:

=
{
        .id             = ROHC_PROFILE_ESP, 
        .create         = c_esp_create,     
        .destroy        = rohc_comp_rfc3095_destroy,
        .encode         = rohc_comp_rfc3095_encode,
        .feedback       = rohc_comp_rfc3095_feedback,
}

Define the compression part of the ESP profile as described in the RFC 3095.