Detailed Description

Files
file	hdr.h
	Generic network interface header.

Data Structures
struct	gnrc_netif_hdr_t
	Generic network interface header. More...

Macros
#define	GNRC_NETIF_HDR_L2ADDR_MAX_LEN (8)
	Maximum length of the l2 addresses of the generic interface header in bytes.

#define	GNRC_NETIF_HDR_L2ADDR_PRINT_LEN (GNRC_NETIF_HDR_L2ADDR_MAX_LEN * 3)
	Maximum length of the string representatiom of l2 addresses of the generic interface header in bytes.

Functions
static void	gnrc_netif_hdr_init (gnrc_netif_hdr_t *hdr, uint8_t src_l2addr_len, uint8_t dst_l2addr_len)
	Initialize the given generic network interface header. More...

static size_t	gnrc_netif_hdr_sizeof (const gnrc_netif_hdr_t *hdr)
	Get the size of the given generic network interface header. More...

static uint8_t *	gnrc_netif_hdr_get_src_addr (const gnrc_netif_hdr_t *hdr)
	Get the source address from the given header. More...

static void	gnrc_netif_hdr_set_src_addr (gnrc_netif_hdr_t hdr, const uint8_t addr, uint8_t addr_len)
	Set the source address in the given header. More...

static uint8_t *	gnrc_netif_hdr_get_dst_addr (const gnrc_netif_hdr_t *hdr)
	Get the destination address from the given header. More...

static void	gnrc_netif_hdr_set_dst_addr (gnrc_netif_hdr_t hdr, const uint8_t addr, uint8_t addr_len)
	Set the destination address in the given header. More...

static int	gnrc_netif_hdr_ipv6_iid_from_src (const gnrc_netif_t netif, const gnrc_netif_hdr_t hdr, eui64_t *iid)
	Converts the source address of a given Generic network interface header to an IPv6 IID. More...

static int	gnrc_netif_hdr_ipv6_iid_from_dst (const gnrc_netif_t netif, const gnrc_netif_hdr_t hdr, eui64_t *iid)
	Converts the destination address of a given Generic network interface header to an IPv6 IID. More...

gnrc_pktsnip_t *	gnrc_netif_hdr_build (const uint8_t src, uint8_t src_len, const uint8_t dst, uint8_t dst_len)
	Builds a generic network interface header for sending and adds it to the packet buffer. More...

static gnrc_netif_t *	gnrc_netif_hdr_get_netif (const gnrc_netif_hdr_t *hdr)
	Convenience function to get the corresponding interface struct for a given interface header. More...

void	gnrc_netif_hdr_print (gnrc_netif_hdr_t *hdr)
	Outputs a generic interface header to stdout. More...

uint8_t	gnrc_netif_hdr_get_flag (gnrc_pktsnip_t *pkt)
	Fetch the netif header flags of a gnrc packet. More...

int	gnrc_netif_hdr_get_dstaddr (gnrc_pktsnip_t pkt, uint8_t *pointer_to_addr)
	Extract the destination address out of a gnrc packet. More...

int	gnrc_netif_hdr_get_srcaddr (gnrc_pktsnip_t pkt, uint8_t *pointer_to_addr)
	Extract the source address out of a gnrc packet. More...

Flags for the gnrc_netif_hdr_t
#define	GNRC_NETIF_HDR_FLAGS_BROADCAST (0x80)
	Send packet broadcast. More...

#define	GNRC_NETIF_HDR_FLAGS_MULTICAST (0x40)
	Send packet multicast. More...

#define	GNRC_NETIF_HDR_FLAGS_MORE_DATA (0x10)
	More data will follow. More...

Macro Definition Documentation

◆ GNRC_NETIF_HDR_FLAGS_BROADCAST

#define GNRC_NETIF_HDR_FLAGS_BROADCAST (0x80)

Send packet broadcast.

Packets with this flag set must be send broadcast. gnrc_netif_hdr_t::dst_l2addr_len and any appended destination address must be ignored. If the link layer does not support broadcast the packet must be dropped silently.

Definition at line 62 of file hdr.h.

◆ GNRC_NETIF_HDR_FLAGS_MORE_DATA

#define GNRC_NETIF_HDR_FLAGS_MORE_DATA (0x10)

More data will follow.

This flag signals that this packet is part of a burst of packets. The link layer implementation can choose to translate this flag into frame header bits to tell the remote node that more traffic will follow shortly. The most direct use case for this flag is to set it for fragmented packets in duty cycled networks to tell the remote node to keep its radio turned on after receiving the first fragment.

See also: The corresponding bit in the IEEE 802.15.4 frame control field, IEEE802154_FCF_FRAME_PEND

Definition at line 90 of file hdr.h.

◆ GNRC_NETIF_HDR_FLAGS_MULTICAST

#define GNRC_NETIF_HDR_FLAGS_MULTICAST (0x40)

Send packet multicast.

Packets with this flag set must be send multicast. gnrc_netif_hdr_t::dst_l2addr_len and any appended destination address must be ignored. The context for the multicast address must be derived from the network layer destination address. If the link layer does not support multicast it should interpret this flag the same way it does GNRC_NETIF_HDR_FLAGS_BROADCAST.

Definition at line 75 of file hdr.h.

Function Documentation

◆ gnrc_netif_hdr_build()

gnrc_pktsnip_t* gnrc_netif_hdr_build	(	const uint8_t *	src,
		uint8_t	src_len,
		const uint8_t *	dst,
		uint8_t	dst_len
	)

Builds a generic network interface header for sending and adds it to the packet buffer.

Parameters

[in]	src	Source address for the header. Can be NULL if not known or required.
[in]	src_len	Length of `src`. Can be 0 if not known or required.
[in]	dst	Destination address for the header. Can be NULL if not known or required.
[in]	dst_len	Length of `dst`. Can be 0 if not known or required.

Returns: The generic network layer header on success.; NULL on error.

◆ gnrc_netif_hdr_get_dst_addr()

static uint8_t* gnrc_netif_hdr_get_dst_addr ( const gnrc_netif_hdr_t * hdr )

inlinestatic

Get the destination address from the given header.

Parameters

[in] hdr header to read from

Returns: pointer to destination address on success; NULL on error

Definition at line 181 of file hdr.h.

◆ gnrc_netif_hdr_get_dstaddr()

int gnrc_netif_hdr_get_dstaddr	(	gnrc_pktsnip_t *	pkt,
		uint8_t **	pointer_to_addr
	)

Extract the destination address out of a gnrc packet.

Parameters

[in]	pkt	gnrc packet from whom to extract
[out]	pointer_to_addr	pointer to address will be stored here

Returns: length of destination address; -ENOENT, if no netif header is presented in pkt or if no destination address field presented in netif header.

◆ gnrc_netif_hdr_get_flag()

uint8_t gnrc_netif_hdr_get_flag ( gnrc_pktsnip_t * pkt )

Fetch the netif header flags of a gnrc packet.

Parameters

[in] pkt gnrc packet from whom to fetch

Returns: netif header flags of pkt; 0, if no header is present

◆ gnrc_netif_hdr_get_netif()

static gnrc_netif_t* gnrc_netif_hdr_get_netif ( const gnrc_netif_hdr_t * hdr )

inlinestatic

Convenience function to get the corresponding interface struct for a given interface header.

Precondition: hdr != NULL

Parameters

[in] hdr Header to read interface from.

Returns: The gnrc_netif_t representation of the interface on success; NULL, on error.

Definition at line 291 of file hdr.h.

◆ gnrc_netif_hdr_get_src_addr()

static uint8_t* gnrc_netif_hdr_get_src_addr ( const gnrc_netif_hdr_t * hdr )

inlinestatic

Get the source address from the given header.

Parameters

[in] hdr header to read from

Returns: pointer to source address on success; NULL on error

Definition at line 149 of file hdr.h.

◆ gnrc_netif_hdr_get_srcaddr()

int gnrc_netif_hdr_get_srcaddr	(	gnrc_pktsnip_t *	pkt,
		uint8_t **	pointer_to_addr
	)

Extract the source address out of a gnrc packet.

Parameters

[in]	pkt	gnrc packet from whom to extract
[out]	pointer_to_addr	pointer to address will be stored here

Returns: length of source address; -ENOENT, if no netif header is presented in pkt or if no source address field presented in netif header.

◆ gnrc_netif_hdr_init()

static void gnrc_netif_hdr_init	(	gnrc_netif_hdr_t *	hdr,
		uint8_t	src_l2addr_len,
		uint8_t	dst_l2addr_len
	)

inlinestatic

Initialize the given generic network interface header.

Parameters

[in]	hdr	header to initialize
[in]	src_l2addr_len	link layer source address length
[in]	dst_l2addr_len	link layer destination address length

Definition at line 117 of file hdr.h.

◆ gnrc_netif_hdr_ipv6_iid_from_dst()

static int gnrc_netif_hdr_ipv6_iid_from_dst	(	const gnrc_netif_t *	netif,
		const gnrc_netif_hdr_t *	hdr,
		eui64_t *	iid
	)

inlinestatic

Converts the destination address of a given Generic network interface header to an IPv6 IID.

Note: netif is intentionally required to be provided so that the caller needs to retrieve it from gnrc_netif_hdr_t::if_pid of hdr only once instead of this function retrieving it at every call.

Precondition: netif->pid == hdr->if_pid

Parameters

[in]	netif	A network interface. gnrc_netif_t::pid must be equal to gnrc_netif_hdr_t::if_pid of `hdr`.
[in]	hdr	Header to convert destination address from.
[out]	iid	The IID based on gnrc_netif_t::device_type.

Returns: same as gnrc_netif_ipv6_iid_from_addr().

Definition at line 249 of file hdr.h.

◆ gnrc_netif_hdr_ipv6_iid_from_src()

static int gnrc_netif_hdr_ipv6_iid_from_src	(	const gnrc_netif_t *	netif,
		const gnrc_netif_hdr_t *	hdr,
		eui64_t *	iid
	)

inlinestatic

Converts the source address of a given Generic network interface header to an IPv6 IID.

Note: netif is intentionally required to be provided so that the caller needs to retrieve it from gnrc_netif_hdr_t::if_pid of hdr only once instead of this function retrieving it at every call.

Precondition: netif->pid == hdr->if_pid

Parameters

[in]	netif	A network interface. gnrc_netif_t::pid must be equal to gnrc_netif_hdr_t::if_pid of `hdr`.
[in]	hdr	Header to convert source address from.
[out]	iid	The IID based on gnrc_netif_t::device_type.

Returns: same as gnrc_netif_ipv6_iid_from_addr().

Definition at line 222 of file hdr.h.

◆ gnrc_netif_hdr_print()

void gnrc_netif_hdr_print ( gnrc_netif_hdr_t * hdr )

Outputs a generic interface header to stdout.

Parameters

[in] hdr A generic interface header.

◆ gnrc_netif_hdr_set_dst_addr()

static void gnrc_netif_hdr_set_dst_addr	(	gnrc_netif_hdr_t *	hdr,
		const uint8_t *	addr,
		uint8_t	addr_len
	)

inlinestatic

Set the destination address in the given header.

Parameters

[in]	hdr	header to write to
[in]	addr	new destination address
[in]	addr_len	addr length

Definition at line 193 of file hdr.h.

◆ gnrc_netif_hdr_set_src_addr()

static void gnrc_netif_hdr_set_src_addr	(	gnrc_netif_hdr_t *	hdr,
		const uint8_t *	addr,
		uint8_t	addr_len
	)

inlinestatic

Set the source address in the given header.

Parameters

[in]	hdr	header to write to
[in]	addr	new source address
[in]	addr_len	addr length

Definition at line 161 of file hdr.h.

◆ gnrc_netif_hdr_sizeof()

static size_t gnrc_netif_hdr_sizeof ( const gnrc_netif_hdr_t * hdr )

inlinestatic

Get the size of the given generic network interface header.

Parameters

[in] hdr header to get the size of

Returns: the size of the given header, including link layer addresses

Definition at line 136 of file hdr.h.

Detailed Description

Files

Data Structures

Macros

Functions

Flags for the gnrc_netif_hdr_t

Macro Definition Documentation

◆ GNRC_NETIF_HDR_FLAGS_BROADCAST

◆ GNRC_NETIF_HDR_FLAGS_MORE_DATA

◆ GNRC_NETIF_HDR_FLAGS_MULTICAST

Function Documentation

◆ gnrc_netif_hdr_build()

◆ gnrc_netif_hdr_get_dst_addr()

◆ gnrc_netif_hdr_get_dstaddr()

◆ gnrc_netif_hdr_get_flag()

◆ gnrc_netif_hdr_get_netif()

◆ gnrc_netif_hdr_get_src_addr()

◆ gnrc_netif_hdr_get_srcaddr()

◆ gnrc_netif_hdr_init()

◆ gnrc_netif_hdr_ipv6_iid_from_dst()

◆ gnrc_netif_hdr_ipv6_iid_from_src()

◆ gnrc_netif_hdr_print()

◆ gnrc_netif_hdr_set_dst_addr()

◆ gnrc_netif_hdr_set_src_addr()

◆ gnrc_netif_hdr_sizeof()