IP-agnostic packet. More...

#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...

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. More...

static uint16_t	from32to16 (const uint32_t x)

static uint16_t	ip_fast_csum (const uint8_t *const iph, const size_t ihl)

bool	ip_create (struct ip_packet const ip, const uint8_t const packet, const size_t size)
	Create an IP packet from raw data. More...

bool	ip_get_inner_packet (const struct ip_packet const outer, struct ip_packet const inner)
	Get the inner IP packet (IP in IP) More...

const uint8_t *	ip_get_raw_data (const struct ip_packet *const ip)
	Get the IP raw data (header + payload) More...

uint8_t *	ip_get_next_header (const struct ip_packet const ip, uint8_t const type)
	Get the IP next header. More...

uint8_t *	ip_get_next_layer (const struct ip_packet *const ip)
	Get the next header (but skip IP extensions) More...

uint8_t *	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. More...

uint8_t *	ip_get_next_ext_from_ext (const uint8_t const ext, uint8_t const type)
	Get the next extension header of IPv6 packets from another extension. More...

unsigned int	ip_get_totlen (const struct ip_packet *const ip)
	Get the total length of an IP packet. More...

unsigned int	ip_get_hdrlen (const struct ip_packet *const ip)
	Get the length of an IP header. More...

bool	ip_is_fragment (const struct ip_packet *const ip)
	Whether the IP packet is an IP fragment or not. More...

ip_version	ip_get_version (const struct ip_packet *const ip)
	Get the IP version of an IP packet. More...

uint8_t	ip_get_protocol (const struct ip_packet *const ip)
	Get the protocol transported by an IP packet. More...

unsigned int	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. More...

unsigned int	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. More...

void	ip_set_version (struct ip_packet *const ip, const ip_version value)
	Set the IP version of an IP packet. More...

void	ip_set_protocol (struct ip_packet *const ip, const uint8_t value)
	Set the protocol transported by an IP packet. More...

void	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. More...

void	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. More...

void	ip_set_saddr (struct ip_packet const ip, const uint8_t value)
	Set the Source Address of an IP packet. More...

void	ip_set_daddr (struct ip_packet const ip, const uint8_t value)
	Set the Destination Address of an IP packet. More...

const struct ipv4_hdr *	ipv4_get_header (const struct ip_packet *const ip)
	Get the IPv4 header. More...

uint16_t	ipv4_get_id (const struct ip_packet *const ip)
	Get the IP-ID of an IPv4 packet. More...

uint16_t	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. More...

int	ipv4_get_df (const struct ip_packet *const ip)
	Get the Don't Fragment (DF) bit of an IPv4 packet. More...

uint32_t	ipv4_get_saddr (const struct ip_packet *const ip)
	Get the source address of an IPv4 packet. More...

uint32_t	ipv4_get_daddr (const struct ip_packet *const ip)
	Get the destination address of an IPv4 packet. More...

void	ipv4_set_id (struct ip_packet *const ip, const int value)
	Set the IP-ID of an IPv4 packet. More...

void	ipv4_set_df (struct ip_packet *const ip, const int value)
	Set the Don't Fragment (DF) bit of an IPv4 packet. More...

const struct ipv6_hdr *	ipv6_get_header (const struct ip_packet *const ip)
	Get the IPv6 header. More...

uint32_t	ip_get_flow_label (const struct ip_packet *const ip)
	Get the flow label of an IPv6 packet. More...

const struct ipv6_addr *	ipv6_get_saddr (const struct ip_packet *const ip)
	Get the source address of an IPv6 packet. More...

const struct ipv6_addr *	ipv6_get_daddr (const struct ip_packet *const ip)
	Get the destination address of an IPv6 packet. More...

void	ip_set_flow_label (struct ip_packet *const ip, const uint32_t value)
	Set the flow label of an IPv6 packet. More...

unsigned short	ip_get_extension_size (const uint8_t *const ext)
	Get the size of an IPv6 extension. More...

unsigned short	ip_get_total_extension_size (const struct ip_packet *const ip)
	Get the size of the extension list. More...

Detailed Description

IP-agnostic packet.

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

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 )

inlinestatic

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

Create an IP packet from raw data.

Parameters

ip	OUT: The IP packet to create
packet	The IP packet data
size	The length of the IP packet data

Returns: Whether the IP packet was successfully created or not

static uint16_t ip_fast_csum	(	const uint8_t *const	iph,
		const size_t	ihl
	)

inlinestatic

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

unsigned short ip_get_extension_size ( const uint8_t *const ext )

Get the size of an IPv6 extension.

Parameters

ext	The extension

Returns: The size of the extension

uint32_t ip_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

unsigned int 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 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* ip_get_next_ext_from_ext	(	const uint8_t *const	ext,
		uint8_t *const	type
	)

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

Parameters

ext	The extension to analyse
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 more extension

uint8_t* 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* 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* 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

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

Set the Destination Address 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 IP address value

void ip_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

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

Set the Source Address 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 IP address value

void 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 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 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 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 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

const struct ipv4_hdr* ipv4_get_header ( const struct ip_packet *const ip )

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 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 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 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 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 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

const struct ipv6_addr* ipv6_get_daddr ( const struct ip_packet *const ip )

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

const struct ipv6_hdr* ipv6_get_header ( const struct ip_packet *const ip )

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

const struct ipv6_addr* ipv6_get_saddr ( const struct ip_packet *const ip )

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

static uint16_t swab16 ( const uint16_t value )

inlinestatic

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

Data Structures

Enumerations

Functions

Detailed Description

Enumeration Type Documentation

Function Documentation