d_udp.c File Reference

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

#include "d_udp.h"
#include "rohc_traces.h"
#include "rohc_bit_ops.h"
#include "rohc_debug.h"
#include "crc.h"
#include "protocols/udp.h"
#include "config.h"

Include dependency graph for d_udp.c:

Functions
void *	d_udp_create (void)
	Create the UDP decompression context.
int	udp_parse_static_udp (struct d_generic_context *context, const unsigned char *packet, unsigned int length, struct rohc_extr_bits *const bits)
	Parse the UDP static part of the ROHC packet.
void	udp_update_context (const struct d_context *context, const struct rohc_decoded_values decoded)
	Update context with decoded UDP values.
Variables
struct d_profile	d_udp_profile
	Define the decompression part of the UDP profile as described in the RFC 3095.

---

Detailed Description

ROHC decompression context for the UDP profile.

Author:

Didier Barvaux <didier.barvaux@toulouse.viveris.com>

Didier Barvaux <didier@barvaux.org>

The hackers from ROHC for Linux

---

Function Documentation

void* d_udp_create

(

void

)

Create the UDP decompression context.

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

Returns:

The newly-created UDP decompression context

References d_generic_context::build_next_header, d_generic_context::compute_crc_dynamic, d_generic_context::compute_crc_static, d_generic_create(), d_generic_destroy(), d_generic_context::decode_values_from_bits, d_generic_context::detect_packet_type, d_generic_context::inner_ip_changes, ip_detect_packet_type(), d_generic_changes::next_header, d_generic_changes::next_header_len, d_generic_context::next_header_len, d_generic_context::next_header_proto, d_generic_context::outer_ip_changes, d_generic_context::parse_dyn_next_hdr, d_generic_context::parse_static_next_hdr, d_generic_context::parse_uo_remainder, rohc_debugf, ROHC_IPPROTO_UDP, rohc_lsb_free(), rohc_lsb_new(), ROHC_LSB_SHIFT_SN, d_generic_context::sn_lsb_ctxt, d_generic_context::specific, d_udp_context::udp_checksum_present, udp_compute_crc_dynamic(), udp_compute_crc_static(), udp_parse_static_udp(), udp_update_context(), d_generic_context::update_context, and zfree.

int udp_parse_static_udp	(	struct d_generic_context *	context,
		const unsigned char *	packet,
		unsigned int	length,
		struct rohc_extr_bits *const	bits
	)

Parse the UDP static part of the ROHC packet.

Parameters:

context	The generic 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

References GET_NEXT_16_BITS, rohc_debugf, rohc_extr_bits::udp_dst, rohc_extr_bits::udp_dst_nr, rohc_extr_bits::udp_src, and rohc_extr_bits::udp_src_nr.

Referenced by d_udp_create(), and d_udp_lite_create().

void udp_update_context	(	const struct d_context *	context,
		const struct rohc_decoded_values	decoded
	)

Update context with decoded UDP values.

The following decoded values are updated in context:

• UDP source port
• UDP destination port

Parameters:

context	The decompression context
decoded	The decoded values to update in the context

References udphdr::dest, d_generic_changes::next_header, d_generic_context::outer_ip_changes, udphdr::source, d_context::specific, rohc_decoded_values::udp_dst, and rohc_decoded_values::udp_src.

Referenced by d_udp_create(), and d_udp_lite_create().

---

Variable Documentation

struct d_profile d_udp_profile

Initial value:

{
        ROHC_PROFILE_UDP,       
        "UDP / Decompressor",   
        d_generic_decode,       
        d_udp_create,
        d_udp_destroy,
        d_generic_get_sn,
}

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