IP-agnostic packet. More...

#include "dllexport.h"
#include "protocols/ipv4.h"
#include "protocols/ipv6.h"
#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>

Include dependency graph for ip.h:

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Data Structures
struct	net_hdr
struct	ip_packet
	Defines an IP-agnostic packet that can handle an IPv4 or IPv6 packet. More...
Defines
#define	IP_GET_16_SUBFIELD(field, bitmask, offset) ((rohc_ntoh16(field) & (bitmask)) >> (offset))
	Get a subpart of a 16-bit IP field.
#define	IP_GET_32_SUBFIELD(field, bitmask, offset) ((rohc_ntoh32(field) & (bitmask)) >> (offset))
	Get a subpart of a 32-bit IP field.
#define	IP_SET_16_SUBFIELD(field, bitmask, offset, value)
	Set a subpart of a 16-bit IP field.
#define	IP_SET_32_SUBFIELD(field, bitmask, offset, value)
	Set a subpart of a 32-bit IP field.
#define	IPV4_DF_OFFSET 14
	The offset for the DF flag in an ipv4_hdr->frag_off variable.
#define	IPV4_GET_DF(ip4) IP_GET_16_SUBFIELD((ip4).frag_off, IP_DF, IPV4_DF_OFFSET)
	Get the IPv4 Don't Fragment (DF) bit from an ipv4_hdr object.
#define	IPV4_SET_DF(ip4, value) IP_SET_16_SUBFIELD((ip4)->frag_off, IP_DF, IPV4_DF_OFFSET, (value))
	Set the IPv4 Don't Fragment (DF) bit in an ipv4_hdr object.
#define	IPV4_ADDR_FORMAT "%02x%02x%02x%02x (%u.%u.%u.%u)"
	The format to print an IPv4 address.
#define	IPV4_ADDR_RAW(x)
	The data to print an IPv4 address in raw format.
#define	IPV6_VERSION_MASK 0xf0000000
	The bitmask for the Version field in an ipv6_hdr->ip6_flow variable.
#define	IPV6_VERSION_OFFSET 28
	The offset for the Version field in an ipv6_hdr->ip6_flow variable.
#define	IPV6_TC_MASK 0x0ff00000
	The bitmask for the Traffic Class (TC) field in an ipv6_hdr->ip6_flow variable.
#define	IPV6_TC_OFFSET 20
	The offset for the Traffic Class (TC) field in an ipv6_hdr->ip6_flow variable.
#define	IPV6_FLOW_LABEL_MASK 0x000fffff
	The bitmask for the FLow Label field in an ipv6_hdr->ip6_flow variable.
#define	IPV6_GET_VERSION(ip6) IP_GET_32_SUBFIELD((ip6).ip6_flow, IPV6_VERSION_MASK, IPV6_VERSION_OFFSET)
	Get the IPv6 Version 4-bit field from ipv6_hdr object.
#define	IPV6_SET_VERSION(ip6, value) IP_SET_32_SUBFIELD((ip6)->ip6_flow, IPV6_VERSION_MASK, IPV6_VERSION_OFFSET, (value))
	Set the IPv6 Version 4-bit field in an ipv6_hdr object.
#define	IPV6_GET_TC(ip6) IP_GET_32_SUBFIELD((ip6).ip6_flow, IPV6_TC_MASK, IPV6_TC_OFFSET)
	Get the IPv6 Traffic Class (TC) byte from an ipv6_hdr object.
#define	IPV6_SET_TC(ip6, value) IP_SET_32_SUBFIELD((ip6)->ip6_flow, IPV6_TC_MASK, IPV6_TC_OFFSET, (value))
	Set the IPv6 Traffic Class (TC) byte in an ipv6_hdr object.
#define	IPV6_GET_FLOW_LABEL(ip6) IP_GET_32_SUBFIELD((ip6).ip6_flow, IPV6_FLOW_LABEL_MASK, 0)
	Get the IPv6 Flow Label 20-bit field from an ipv6_hdr object.
#define	IPV6_SET_FLOW_LABEL(ip6, value) IP_SET_32_SUBFIELD((ip6)->ip6_flow, IPV6_FLOW_LABEL_MASK, 0, (value))
	Set the IPv6 Flow Label 20-bit field in an ipv6_hdr variable.
#define	IPV6_ADDR_FORMAT "%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x"
	The format to print an IPv6 address.
#define	IPV6_ADDR_IN6(x) IPV6_ADDR_RAW((x)->addr.u8)
	The data to print an IPv6 address in (struct ipv6_addr *) format.
#define	IPV6_ADDR_RAW(x)
	The data to print an IPv6 address in raw format.
#define	IPV6_ADDR_CMP(x, y)
	Compare two IPv6 addresses in (struct ipv6_addr *) format.
Enumerations
enum	ip_header_pos_t { ROHC_IP_HDR_NONE = 0, ROHC_IP_HDR_FIRST = 1, ROHC_IP_HDR_SECOND = 2 }
enum	ip_version { IPV4 = 4, IPV6 = 6, IP_UNKNOWN = 0, IPV4_MALFORMED = 1, IPV6_MALFORMED = 2 }
	IP version. More...
Functions
static uint16_t	swab16 (const uint16_t value)
	In-place change the byte order in a two-byte value.
static uint16_t	from32to16 (const uint32_t x)
static uint16_t	ip_fast_csum (const uint8_t *const iph, const size_t ihl)
bool ROHC_EXPORT	ip_create (struct ip_packet const ip, const uint8_t const packet, const size_t size)
bool ROHC_EXPORT	ip_get_inner_packet (const struct ip_packet const outer, struct ip_packet const inner)
	Get the inner IP packet (IP in IP)
const uint8_t *ROHC_EXPORT	ip_get_raw_data (const struct ip_packet *const ip)
	Get the IP raw data (header + payload)
uint8_t *ROHC_EXPORT	ip_get_next_header (const struct ip_packet const ip, uint8_t const type)
	Get the IP next header.
uint8_t *ROHC_EXPORT	ip_get_next_layer (const struct ip_packet *const ip)
	Get the next header (but skip IP extensions)
uint8_t *ROHC_EXPORT	ip_get_next_ext_from_ip (const struct ip_packet const ip, uint8_t const type)
	Get the next extension header of IPv6 packets from an IPv6 header.
uint8_t *ROHC_EXPORT	ip_get_next_ext_from_ext (const uint8_t const ext, uint8_t const type)
unsigned int ROHC_EXPORT	ip_get_totlen (const struct ip_packet *const ip)
	Get the total length of an IP packet.
unsigned int ROHC_EXPORT	ip_get_hdrlen (const struct ip_packet *const ip)
	Get the length of an IP header.
unsigned int ROHC_EXPORT	ip_get_plen (const struct ip_packet *const ip)
	Get the length of an IPv4/IPv6 payload.
bool ROHC_EXPORT	ip_is_fragment (const struct ip_packet *const ip)
	Whether the IP packet is an IP fragment or not.
ip_version ROHC_EXPORT	ip_get_version (const struct ip_packet *const ip)
	Get the IP version of an IP packet.
uint8_t ROHC_EXPORT	ip_get_protocol (const struct ip_packet *const ip)
	Get the protocol transported by an IP packet.
unsigned int ROHC_EXPORT	ip_get_tos (const struct ip_packet *const ip)
	Get the IPv4 Type Of Service (TOS) or IPv6 Traffic Class (TC) of an IP packet.
unsigned int ROHC_EXPORT	ip_get_ttl (const struct ip_packet *const ip)
	Get the IPv4 Time To Live (TTL) or IPv6 Hop Limit (HL) of an IP packet.
void ROHC_EXPORT	ip_set_version (struct ip_packet *const ip, const ip_version value)
	Set the IP version of an IP packet.
void ROHC_EXPORT	ip_set_protocol (struct ip_packet *const ip, const uint8_t value)
	Set the protocol transported by an IP packet.
void ROHC_EXPORT	ip_set_tos (struct ip_packet *const ip, const uint8_t value)
	Set the IPv4 Type Of Service (TOS) or IPv6 Traffic Class (TC) of an IP packet.
void ROHC_EXPORT	ip_set_ttl (struct ip_packet *const ip, const uint8_t value)
	Set the IPv4 Time To Live (TTL) or IPv6 Hop Limit (HL) of an IP packet.
void ROHC_EXPORT	ip_set_saddr (struct ip_packet const ip, const uint8_t value)
void ROHC_EXPORT	ip_set_daddr (struct ip_packet const ip, const uint8_t value)
struct ipv4_hdr *ROHC_EXPORT	ipv4_get_header (const struct ip_packet *const ip)
	Get the IPv4 header.
uint16_t ROHC_EXPORT	ipv4_get_id (const struct ip_packet *const ip)
	Get the IP-ID of an IPv4 packet.
uint16_t ROHC_EXPORT	ipv4_get_id_nbo (const struct ip_packet *const ip, const unsigned int nbo)
	Get the IP-ID of an IPv4 packet in Network Byte Order.
int ROHC_EXPORT	ipv4_get_df (const struct ip_packet *const ip)
	Get the Don't Fragment (DF) bit of an IPv4 packet.
uint32_t ROHC_EXPORT	ipv4_get_saddr (const struct ip_packet *const ip)
	Get the source address of an IPv4 packet.
uint32_t ROHC_EXPORT	ipv4_get_daddr (const struct ip_packet *const ip)
	Get the destination address of an IPv4 packet.
void ROHC_EXPORT	ipv4_set_id (struct ip_packet *const ip, const int value)
	Set the IP-ID of an IPv4 packet.
void ROHC_EXPORT	ipv4_set_df (struct ip_packet *const ip, const int value)
	Set the Don't Fragment (DF) bit of an IPv4 packet.
struct ipv6_hdr *ROHC_EXPORT	ipv6_get_header (const struct ip_packet *const ip)
	Get the IPv6 header.
uint32_t ROHC_EXPORT	ipv6_get_flow_label (const struct ip_packet *const ip)
	Get the flow label of an IPv6 packet.
struct ipv6_addr *ROHC_EXPORT	ipv6_get_saddr (const struct ip_packet *const ip)
	Get the source address of an IPv6 packet.
struct ipv6_addr *ROHC_EXPORT	ipv6_get_daddr (const struct ip_packet *const ip)
	Get the destination address of an IPv6 packet.
void ROHC_EXPORT	ipv6_set_flow_label (struct ip_packet *const ip, const uint32_t value)
	Set the flow label of an IPv6 packet.
unsigned short ROHC_EXPORT	ip_get_extension_size (const uint8_t *const ext)
unsigned short ROHC_EXPORT	ip_get_total_extension_size (const struct ip_packet *const ip)
	Get the size of the extension list.
bool	get_ip_version (const uint8_t const packet, const size_t size, ip_version const version)

Detailed Description

IP-agnostic packet.

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

Define Documentation

#define IP_GET_16_SUBFIELD	(	field,
		bitmask,
		offset
	)	((rohc_ntoh16(field) & (bitmask)) >> (offset))

Get a subpart of a 16-bit IP field.

#define IP_GET_32_SUBFIELD	(	field,
		bitmask,
		offset
	)	((rohc_ntoh32(field) & (bitmask)) >> (offset))

Get a subpart of a 32-bit IP field.

#define IP_SET_16_SUBFIELD	(	field,
		bitmask,
		offset,
		value
	)

Value:

(field) = (((field) & rohc_hton16(~(bitmask))) | \
                   rohc_hton16(((value) << (offset)) & (bitmask)))

Set a subpart of a 16-bit IP field.

#define IP_SET_32_SUBFIELD	(	field,
		bitmask,
		offset,
		value
	)

Value:

(field) = (((field) & rohc_hton32(~(bitmask))) | \
                   rohc_hton32(((value) << (offset)) & (bitmask)))

Set a subpart of a 32-bit IP field.

#define IPV4_ADDR_FORMAT "%02x%02x%02x%02x (%u.%u.%u.%u)"

The format to print an IPv4 address.

#define IPV4_ADDR_RAW ( x )

Value:

(x)[0], (x)[1], (x)[2], (x)[3], \
        (x)[0], (x)[1], (x)[2], (x)[3]

The data to print an IPv4 address in raw format.

#define IPV4_DF_OFFSET 14

The offset for the DF flag in an ipv4_hdr->frag_off variable.

#define IPV4_GET_DF ( ip4 ) IP_GET_16_SUBFIELD((ip4).frag_off, IP_DF, IPV4_DF_OFFSET)

Get the IPv4 Don't Fragment (DF) bit from an ipv4_hdr object.

#define IPV4_SET_DF	(	ip4,
		value
	)	IP_SET_16_SUBFIELD((ip4)->frag_off, IP_DF, IPV4_DF_OFFSET, (value))

Set the IPv4 Don't Fragment (DF) bit in an ipv4_hdr object.

#define IPV6_ADDR_CMP	(	x,
		y
	)

Value:

((x)->addr.u32[0] == (y)->addr.u32[0] && \
         (x)->addr.u32[1] == (y)->addr.u32[1] && \
         (x)->addr.u32[2] == (y)->addr.u32[2] && \
         (x)->addr.u32[3] == (y)->addr.u32[3])

Compare two IPv6 addresses in (struct ipv6_addr *) format.

#define IPV6_ADDR_FORMAT "%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x"

The format to print an IPv6 address.

#define IPV6_ADDR_IN6 ( x ) IPV6_ADDR_RAW((x)->addr.u8)

The data to print an IPv6 address in (struct ipv6_addr *) format.

#define IPV6_ADDR_RAW ( x )

Value:

(x)[0], (x)[1], (x)[2], (x)[3], (x)[4], (x)[5], (x)[6], (x)[7], \
        (x)[8], (x)[9], (x)[10], (x)[11], (x)[12], (x)[13], (x)[14], (x)[15]

The data to print an IPv6 address in raw format.

#define IPV6_FLOW_LABEL_MASK 0x000fffff

The bitmask for the FLow Label field in an ipv6_hdr->ip6_flow variable.

#define IPV6_GET_FLOW_LABEL ( ip6 ) IP_GET_32_SUBFIELD((ip6).ip6_flow, IPV6_FLOW_LABEL_MASK, 0)

Get the IPv6 Flow Label 20-bit field from an ipv6_hdr object.

#define IPV6_GET_TC ( ip6 ) IP_GET_32_SUBFIELD((ip6).ip6_flow, IPV6_TC_MASK, IPV6_TC_OFFSET)

Get the IPv6 Traffic Class (TC) byte from an ipv6_hdr object.

#define IPV6_GET_VERSION ( ip6 ) IP_GET_32_SUBFIELD((ip6).ip6_flow, IPV6_VERSION_MASK, IPV6_VERSION_OFFSET)

Get the IPv6 Version 4-bit field from ipv6_hdr object.

#define IPV6_SET_FLOW_LABEL	(	ip6,
		value
	)	IP_SET_32_SUBFIELD((ip6)->ip6_flow, IPV6_FLOW_LABEL_MASK, 0, (value))

Set the IPv6 Flow Label 20-bit field in an ipv6_hdr variable.

#define IPV6_SET_TC	(	ip6,
		value
	)	IP_SET_32_SUBFIELD((ip6)->ip6_flow, IPV6_TC_MASK, IPV6_TC_OFFSET, (value))

Set the IPv6 Traffic Class (TC) byte in an ipv6_hdr object.

#define IPV6_SET_VERSION	(	ip6,
		value
	)	IP_SET_32_SUBFIELD((ip6)->ip6_flow, IPV6_VERSION_MASK, IPV6_VERSION_OFFSET, (value))

Set the IPv6 Version 4-bit field in an ipv6_hdr object.

#define IPV6_TC_MASK 0x0ff00000

The bitmask for the Traffic Class (TC) field in an ipv6_hdr->ip6_flow variable.

#define IPV6_TC_OFFSET 20

The offset for the Traffic Class (TC) field in an ipv6_hdr->ip6_flow variable.

#define IPV6_VERSION_MASK 0xf0000000

The bitmask for the Version field in an ipv6_hdr->ip6_flow variable.

#define IPV6_VERSION_OFFSET 28

The offset for the Version field in an ipv6_hdr->ip6_flow variable.

Enumeration Type Documentation

enum ip_header_pos_t

The selected IP header

Enumerator:

ROHC_IP_HDR_NONE	No IP header selected
ROHC_IP_HDR_FIRST	The first IP header is selected
ROHC_IP_HDR_SECOND	The second IP header is selected

enum ip_version

IP version.

Enumerator:

IPV4	IP version 4.
IPV6	IP version 6.
IP_UNKNOWN	not IP
IPV4_MALFORMED	IP version 4 (malformed)
IPV6_MALFORMED	IP version 6 (malformed)

Function Documentation

static uint16_t from32to16 ( const uint32_t x ) [inline, static]

bool get_ip_version	(	const uint8_t *const	packet,
		const size_t	size,
		ip_version *const	version
	)

bool ROHC_EXPORT ip_create	(	struct ip_packet *const	ip,
		const uint8_t *const	packet,
		const size_t	size
	)

static uint16_t ip_fast_csum	(	const uint8_t *const	iph,
		const size_t	ihl
	)		`[inline, static]`

This is a version of ip_compute_csum() optimized for IP headers, which always checksum on 4 octet boundaries.

unsigned short ROHC_EXPORT ip_get_extension_size ( const uint8_t *const ext )

unsigned int ROHC_EXPORT ip_get_hdrlen ( const struct ip_packet *const ip )

Get the length of an IP header.

The function does not handle ip_packet whose ip_packet::version is IP_UNKNOWN.

Parameters:

ip	The IP packet to analyze

Returns:: The length of the IP header if successful, 0 otherwise

bool ROHC_EXPORT ip_get_inner_packet	(	const struct ip_packet *const	outer,
		struct ip_packet *const	inner
	)

Get the inner IP packet (IP in IP)

The function does not handle ip_packet whose ip_packet::version is IP_UNKNOWN.

Parameters:

outer	The outer IP packet to analyze
inner	The inner IP packet to create

Returns:: Whether the inner IP header is successfully created or not

uint8_t* ROHC_EXPORT ip_get_next_ext_from_ext	(	const uint8_t *const	ext,
		uint8_t *const	type
	)

uint8_t* ROHC_EXPORT ip_get_next_ext_from_ip	(	const struct ip_packet *const	ip,
		uint8_t *const	type
	)

Get the next extension header of IPv6 packets from an IPv6 header.

The function does not handle ip_packet whose ip_packet::version is IP_UNKNOWN.

Parameters:

ip	The IP packet to analyze
type	OUT: The type of the next header If there is no next header the value must be ignored

Returns:: The next extension header, NULL if there is no extension

uint8_t* ROHC_EXPORT ip_get_next_header	(	const struct ip_packet *const	ip,
		uint8_t *const	type
	)

Get the IP next header.

The function does not handle ip_packet whose ip_packet::version is IP_UNKNOWN.

Parameters:

ip	The IP packet to analyze
type	OUT: The type of the next header

Returns:: The next header if successful, NULL otherwise

uint8_t* ROHC_EXPORT ip_get_next_layer ( const struct ip_packet *const ip )

Get the next header (but skip IP extensions)

The function does not handle ip_packet whose ip_packet::version is IP_UNKNOWN.

Parameters:

ip	The IP packet to analyze

Returns:: The next header that is not an IP extension if there is one, NULL if there is none

unsigned int ROHC_EXPORT ip_get_plen ( const struct ip_packet *const ip )

Get the length of an IPv4/IPv6 payload.

The function does not handle ip_packet whose ip_packet::version is IP_UNKNOWN.

Parameters:

ip	The IPv4/IPv6 packet to analyze

Returns:: The length of the IPv4/IPv6 payload if successful, 0 otherwise

uint8_t ROHC_EXPORT ip_get_protocol ( const struct ip_packet *const ip )

Get the protocol transported by an IP packet.

The protocol returned is the one transported by the last known IP extension header if any is found.

The function handles ip_packet whose ip_packet::version is IP_UNKNOWN. It always returns the special value 0.

Parameters:

ip	The IP packet to analyze

Returns:: The protocol number that identify the protocol transported by the given IP packet, 0 if the packet is not IPv4 nor IPv6

const uint8_t* ROHC_EXPORT ip_get_raw_data ( const struct ip_packet *const ip )

Get the IP raw data (header + payload)

The function handles ip_packet whose ip_packet::version is IP_UNKNOWN.

Parameters:

ip	The IP packet to analyze

Returns:: The IP raw data (header + payload)

unsigned int ROHC_EXPORT ip_get_tos ( const struct ip_packet *const ip )

Get the IPv4 Type Of Service (TOS) or IPv6 Traffic Class (TC) of an IP packet.

The function does not handle ip_packet whose ip_packet::version is IP_UNKNOWN.

Parameters:

ip	The IP packet to analyze

Returns:: The TOS or TC value if successful, 0 otherwise

unsigned short ROHC_EXPORT ip_get_total_extension_size ( const struct ip_packet *const ip )

Get the size of the extension list.

The function does not handle ip_packet whose ip_packet::version is IP_UNKNOWN.

Parameters:

ip	The packet to analyse

Returns:: The size of extension list

unsigned int ROHC_EXPORT ip_get_totlen ( const struct ip_packet *const ip )

Get the total length of an IP packet.

The function handles ip_packet whose ip_packet::version is IP_UNKNOWN.

Parameters:

ip	The IP packet to analyze

Returns:: The total length of the IP packet

unsigned int ROHC_EXPORT ip_get_ttl ( const struct ip_packet *const ip )

Get the IPv4 Time To Live (TTL) or IPv6 Hop Limit (HL) of an IP packet.

The function does not handle ip_packet whose ip_packet::version is IP_UNKNOWN.

Parameters:

ip	The IP packet to analyze

Returns:: The TTL or HL value if successful, 0 otherwise

ip_version ROHC_EXPORT ip_get_version ( const struct ip_packet *const ip )

Get the IP version of an IP packet.

The function handles ip_packet whose ip_packet::version is IP_UNKNOWN.

Parameters:

ip	The IP packet to analyze

Returns:: The version of the IP packet

bool ROHC_EXPORT ip_is_fragment ( const struct ip_packet *const ip )

Whether the IP packet is an IP fragment or not.

The IP packet is a fragment if the MF (More Fragments) bit is set or the Fragment Offset field is non-zero.

The function does not handle ip_packet whose ip_packet::version is IP_UNKNOWN.

Parameters:

ip	The IP packet to analyze

Returns:: Whether the IP packet is an IP fragment or not

void ROHC_EXPORT ip_set_daddr	(	struct ip_packet *const	ip,
		const uint8_t *	value
	)

void ROHC_EXPORT ip_set_protocol	(	struct ip_packet *const	ip,
		const uint8_t	value
	)

Set the protocol transported by an IP packet.

The function does not handle ip_packet whose ip_packet::version is IP_UNKNOWN.

Parameters:

ip	The IP packet to modify
value	The protocol value

void ROHC_EXPORT ip_set_saddr	(	struct ip_packet *const	ip,
		const uint8_t *	value
	)

void ROHC_EXPORT ip_set_tos	(	struct ip_packet *const	ip,
		const uint8_t	value
	)

Set the IPv4 Type Of Service (TOS) or IPv6 Traffic Class (TC) of an IP packet.

The function does not handle ip_packet whose ip_packet::version is IP_UNKNOWN.

Parameters:

ip	The IP packet to modify
value	The TOS/TC value

void ROHC_EXPORT ip_set_ttl	(	struct ip_packet *const	ip,
		const uint8_t	value
	)

Set the IPv4 Time To Live (TTL) or IPv6 Hop Limit (HL) of an IP packet.

The function does not handle ip_packet whose ip_packet::version is IP_UNKNOWN.

Parameters:

ip	The IP packet to modify
value	The TTL/HL value

void ROHC_EXPORT ip_set_version	(	struct ip_packet *const	ip,
		const ip_version	value
	)

Set the IP version of an IP packet.

Parameters:

ip	The IP packet to modify
value	The version value

uint32_t ROHC_EXPORT ipv4_get_daddr ( const struct ip_packet *const ip )

Get the destination address of an IPv4 packet.

The function does not handle ip_packet whose ip_packet::version is not IPV4.

Parameters:

ip	The IPv4 packet to analyze

Returns:: The source address of the given IPv4 packet

int ROHC_EXPORT ipv4_get_df ( const struct ip_packet *const ip )

Get the Don't Fragment (DF) bit of an IPv4 packet.

The function does not handle ip_packet whose ip_packet::version is not IPV4.

Parameters:

ip	The IP packet to analyze

Returns:: The DF bit

struct ipv4_hdr* ROHC_EXPORT ipv4_get_header ( const struct ip_packet *const ip ) [read]

Get the IPv4 header.

The function does not handle ip_packet whose ip_packet::version is not IPV4.

Parameters:

ip	The IP packet to analyze

Returns:: The IP header

uint16_t ROHC_EXPORT ipv4_get_id ( const struct ip_packet *const ip )

Get the IP-ID of an IPv4 packet.

The IP-ID value is returned as-is (ie. not automatically converted to the host byte order).

The function does not handle ip_packet whose ip_packet::version is not IPV4.

Parameters:

ip	The IP packet to analyze

Returns:: The IP-ID

uint16_t ROHC_EXPORT ipv4_get_id_nbo	(	const struct ip_packet *const	ip,
		const unsigned int	nbo
	)

Get the IP-ID of an IPv4 packet in Network Byte Order.

The function does not handle ip_packet whose ip_packet::version is not IPV4.

Parameters:

ip	The IP packet to analyze
nbo	The NBO flag (if RND = 1, use NBO = 1)

Returns:: The IP-ID

uint32_t ROHC_EXPORT ipv4_get_saddr ( const struct ip_packet *const ip )

Get the source address of an IPv4 packet.

The function does not handle ip_packet whose ip_packet::version is not IPV4.

Parameters:

ip	The IPv4 packet to analyze

Returns:: The source address of the given IPv4 packet

void ROHC_EXPORT ipv4_set_df	(	struct ip_packet *const	ip,
		const int	value
	)

Set the Don't Fragment (DF) bit of an IPv4 packet.

The function does not handle ip_packet whose ip_packet::version is not IPV4.

Parameters:

ip	The IP packet to modify
value	The value of the DF bit

void ROHC_EXPORT ipv4_set_id	(	struct ip_packet *const	ip,
		const int	value
	)

Set the IP-ID of an IPv4 packet.

The IP-ID value is set as-is (ie. not automatically converted to the host byte order).

The function does not handle ip_packet whose ip_packet::version is not IPV4.

Parameters:

ip	The IP packet to modify
value	The IP-ID value

struct ipv6_addr* ROHC_EXPORT ipv6_get_daddr ( const struct ip_packet *const ip ) [read]

Get the destination address of an IPv6 packet.

The function does not handle ip_packet whose ip_packet::version is not IPV6.

Parameters:

ip	The IPv6 packet to analyze

Returns:: The source address of the given IPv6 packet

uint32_t ROHC_EXPORT ipv6_get_flow_label ( const struct ip_packet *const ip )

Get the flow label of an IPv6 packet.

The function does not handle ip_packet whose ip_packet::version is not IPV6.

Parameters:

ip	The IPv6 packet to analyze

Returns:: The flow label of the given IPv6 packet

struct ipv6_hdr* ROHC_EXPORT ipv6_get_header ( const struct ip_packet *const ip ) [read]

Get the IPv6 header.

The function does not handle ip_packet whose ip_packet::version is not IPV6.

Parameters:

ip	The IP packet to analyze

Returns:: The IP header if IPv6

struct ipv6_addr* ROHC_EXPORT ipv6_get_saddr ( const struct ip_packet *const ip ) [read]

Get the source address of an IPv6 packet.

The function does not handle ip_packet whose ip_packet::version is not IPV6.

Parameters:

ip	The IPv6 packet to analyze

Returns:: The source address of the given IPv6 packet

void ROHC_EXPORT ipv6_set_flow_label	(	struct ip_packet *const	ip,
		const uint32_t	value
	)

Set the flow label of an IPv6 packet.

The function does not handle ip_packet whose ip_packet::version is not IPV6.

Parameters:

ip	The IPv6 packet to modify
value	The flow label value

static uint16_t swab16 ( const uint16_t value ) [inline, static]

In-place change the byte order in a two-byte value.

Parameters:

value The two-byte value to modify

Returns:: The same value with the byte order changed

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