c_esp.c File Reference

ROHC ESP compression profile. More...

#include "c_esp.h"
#include "c_generic.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:

Data Structures
struct	sc_esp_context
	Define the ESP part of the profile decompression context. More...
Functions
bool	c_esp_check_profile (const struct rohc_comp *const comp, const struct ip_packet *const outer_ip, const struct ip_packet *const inner_ip, const uint8_t protocol, rohc_ctxt_key_t *const ctxt_key)
	Check if the given packet corresponds to the ESP profile.
Variables
struct c_profile	c_esp_profile
	Define the compression part of the ESP profile as described in the RFC 3095.

---

Detailed Description

ROHC ESP compression profile.

Author:

FWX <rohc_team@dialine.fr>

Didier Barvaux <didier@barvaux.org>

---

Function Documentation

bool c_esp_check_profile	(	const struct rohc_comp *const	comp,
		const struct ip_packet *const	outer_ip,
		const struct ip_packet *const	inner_ip,
		const uint8_t	protocol,
		rohc_ctxt_key_t *const	ctxt_key
	)

Check if the given packet corresponds to the ESP profile.

Conditions are:

• the transport protocol is ESP
• the version of the outer IP header is 4 or 6
• the outer IP header is not an IP fragment
• if there are at least 2 IP headers, the version of the inner IP header is 4 or 6
• if there are at least 2 IP headers, the inner IP header is not an IP fragment

See also:

c_generic_check_profile

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

Parameters:

comp	The ROHC compressor
outer_ip	The outer IP header of the IP packet to check
inner_ip	The inner IP header of the IP packet to check if the IP packet contains at least 2 IP headers, NULL if the IP packet to check contains only one IP header
protocol	The transport protocol carried by the IP packet: the protocol carried by the outer IP header if there is only one IP header, the protocol carried by the inner IP header if there are at least two IP headers.
ctxt_key	The key to help finding the context associated with packet

Returns:

Whether the IP packet corresponds to the profile:

• true if the IP packet corresponds to the profile,
• false if the IP packet does not correspond to the profile

References c_generic_check_profile(), ip_get_next_layer(), ip_get_plen(), ROHC_IPPROTO_ESP, and esphdr::spi.

---

Variable Documentation

struct c_profile c_esp_profile

Initial value:

{
        ROHC_IPPROTO_ESP,    
        ROHC_PROFILE_ESP,    
        "ESP / Compressor",  
        c_esp_create,        
        c_generic_destroy,
        c_esp_check_profile,
        c_esp_check_context,
        c_esp_encode,
        c_generic_reinit_context,
        c_generic_feedback,
        c_generic_use_udp_port,
}

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