Network Packet Library

Network packet management library. More...

Data Structures
struct	net_pkt_cursor
struct	net_pkt
	Network packet. More...
struct	net_pkt_data_access

Macros
#define	NET_PKT_SLAB_DEFINE(name, count)    K_MEM_SLAB_DEFINE(name, sizeof(struct net_pkt), count, 4)
	Create a net_pkt slab.
#define	NET_PKT_TX_SLAB_DEFINE(name, count)   NET_PKT_SLAB_DEFINE(name, count)
#define	NET_PKT_DATA_POOL_DEFINE(name, count)
	Create a data fragment net_buf pool.
#define	net_pkt_print_frags(pkt)
	Print fragment list and the fragment sizes.
#define	NET_PKT_DATA_ACCESS_DEFINE(_name, _type)
#define	NET_PKT_DATA_ACCESS_CONTIGUOUS_DEFINE(_name, _type)

Functions
struct net_buf *	net_pkt_get_reserve_data (struct net_buf_pool *pool, size_t min_len, k_timeout_t timeout)
	Get a data buffer from a given pool.
struct net_buf *	net_pkt_get_reserve_rx_data (size_t min_len, k_timeout_t timeout)
	Get RX DATA buffer from pool.
struct net_buf *	net_pkt_get_reserve_tx_data (size_t min_len, k_timeout_t timeout)
	Get TX DATA buffer from pool.
struct net_buf *	net_pkt_get_frag (struct net_pkt *pkt, size_t min_len, k_timeout_t timeout)
	Get a data fragment that might be from user specific buffer pool or from global DATA pool.
void	net_pkt_unref (struct net_pkt *pkt)
	Place packet back into the available packets slab.
struct net_pkt *	net_pkt_ref (struct net_pkt *pkt)
	Increase the packet ref count.
struct net_buf *	net_pkt_frag_ref (struct net_buf *frag)
	Increase the packet fragment ref count.
void	net_pkt_frag_unref (struct net_buf *frag)
	Decrease the packet fragment ref count.
struct net_buf *	net_pkt_frag_del (struct net_pkt *pkt, struct net_buf *parent, struct net_buf *frag)
	Delete existing fragment from a packet.
void	net_pkt_frag_add (struct net_pkt *pkt, struct net_buf *frag)
	Add a fragment to a packet at the end of its fragment list.
void	net_pkt_frag_insert (struct net_pkt *pkt, struct net_buf *frag)
	Insert a fragment to a packet at the beginning of its fragment list.
void	net_pkt_compact (struct net_pkt *pkt)
	Compact the fragment list of a packet.
void	net_pkt_get_info (struct k_mem_slab **rx, struct k_mem_slab **tx, struct net_buf_pool **rx_data, struct net_buf_pool **tx_data)
	Get information about predefined RX, TX and DATA pools.
struct net_pkt *	net_pkt_alloc (k_timeout_t timeout)
	Allocate an initialized net_pkt.
struct net_pkt *	net_pkt_alloc_from_slab (struct k_mem_slab *slab, k_timeout_t timeout)
	Allocate an initialized net_pkt from a specific slab.
struct net_pkt *	net_pkt_rx_alloc (k_timeout_t timeout)
	Allocate an initialized net_pkt for RX.
struct net_pkt *	net_pkt_alloc_on_iface (struct net_if *iface, k_timeout_t timeout)
	Allocate a network packet for a specific network interface.
struct net_pkt *	net_pkt_rx_alloc_on_iface (struct net_if *iface, k_timeout_t timeout)
int	net_pkt_alloc_buffer (struct net_pkt *pkt, size_t size, enum net_ip_protocol proto, k_timeout_t timeout)
	Allocate buffer for a net_pkt.
int	net_pkt_alloc_buffer_raw (struct net_pkt *pkt, size_t size, k_timeout_t timeout)
	Allocate buffer for a net_pkt, of specified size, w/o any additional preconditions.
struct net_pkt *	net_pkt_alloc_with_buffer (struct net_if *iface, size_t size, sa_family_t family, enum net_ip_protocol proto, k_timeout_t timeout)
	Allocate a network packet and buffer at once.
struct net_pkt *	net_pkt_rx_alloc_with_buffer (struct net_if *iface, size_t size, sa_family_t family, enum net_ip_protocol proto, k_timeout_t timeout)
void	net_pkt_append_buffer (struct net_pkt *pkt, struct net_buf *buffer)
	Append a buffer in packet.
size_t	net_pkt_available_buffer (struct net_pkt *pkt)
	Get available buffer space from a pkt.
size_t	net_pkt_available_payload_buffer (struct net_pkt *pkt, enum net_ip_protocol proto)
	Get available buffer space for payload from a pkt.
void	net_pkt_trim_buffer (struct net_pkt *pkt)
	Trim net_pkt buffer.
int	net_pkt_remove_tail (struct net_pkt *pkt, size_t length)
	Remove length bytes from tail of packet.
void	net_pkt_cursor_init (struct net_pkt *pkt)
	Initialize net_pkt cursor.
static void	net_pkt_cursor_backup (struct net_pkt *pkt, struct net_pkt_cursor *backup)
	Backup net_pkt cursor.
static void	net_pkt_cursor_restore (struct net_pkt *pkt, struct net_pkt_cursor *backup)
	Restore net_pkt cursor from a backup.
static void *	net_pkt_cursor_get_pos (struct net_pkt *pkt)
	Returns current position of the cursor.
int	net_pkt_skip (struct net_pkt *pkt, size_t length)
	Skip some data from a net_pkt.
int	net_pkt_memset (struct net_pkt *pkt, int byte, size_t length)
	Memset some data in a net_pkt.
int	net_pkt_copy (struct net_pkt *pkt_dst, struct net_pkt *pkt_src, size_t length)
	Copy data from a packet into another one.
struct net_pkt *	net_pkt_clone (struct net_pkt *pkt, k_timeout_t timeout)
	Clone pkt and its buffer.
struct net_pkt *	net_pkt_rx_clone (struct net_pkt *pkt, k_timeout_t timeout)
	Clone pkt and its buffer.
struct net_pkt *	net_pkt_shallow_clone (struct net_pkt *pkt, k_timeout_t timeout)
	Clone pkt and increase the refcount of its buffer.
int	net_pkt_read (struct net_pkt *pkt, void *data, size_t length)
	Read some data from a net_pkt.
static int	net_pkt_read_u8 (struct net_pkt *pkt, uint8_t *data)
int	net_pkt_read_be16 (struct net_pkt *pkt, uint16_t *data)
	Read uint16_t big endian data from a net_pkt.
int	net_pkt_read_le16 (struct net_pkt *pkt, uint16_t *data)
	Read uint16_t little endian data from a net_pkt.
int	net_pkt_read_be32 (struct net_pkt *pkt, uint32_t *data)
	Read uint32_t big endian data from a net_pkt.
int	net_pkt_write (struct net_pkt *pkt, const void *data, size_t length)
	Write data into a net_pkt.
static int	net_pkt_write_u8 (struct net_pkt *pkt, uint8_t data)
static int	net_pkt_write_be16 (struct net_pkt *pkt, uint16_t data)
static int	net_pkt_write_be32 (struct net_pkt *pkt, uint32_t data)
static int	net_pkt_write_le32 (struct net_pkt *pkt, uint32_t data)
static int	net_pkt_write_le16 (struct net_pkt *pkt, uint16_t data)
size_t	net_pkt_remaining_data (struct net_pkt *pkt)
	Get the amount of data which can be read from current cursor position.
int	net_pkt_update_length (struct net_pkt *pkt, size_t length)
	Update the overall length of a packet.
int	net_pkt_pull (struct net_pkt *pkt, size_t length)
	Remove data from the packet at current location.
uint16_t	net_pkt_get_current_offset (struct net_pkt *pkt)
	Get the actual offset in the packet from its cursor.
bool	net_pkt_is_contiguous (struct net_pkt *pkt, size_t size)
	Check if a data size could fit contiguously.
size_t	net_pkt_get_contiguous_len (struct net_pkt *pkt)
	Get the contiguous buffer space.
void *	net_pkt_get_data (struct net_pkt *pkt, struct net_pkt_data_access *access)
	Get data from a network packet in a contiguous way.
int	net_pkt_set_data (struct net_pkt *pkt, struct net_pkt_data_access *access)
	Set contiguous data into a network packet.
static int	net_pkt_acknowledge_data (struct net_pkt *pkt, struct net_pkt_data_access *access)
	Acknowledge previously contiguous data taken from a network packet Packet needs to be set to overwrite mode.

Detailed Description

Network packet management library.

Macro Definition Documentation

NET_PKT_DATA_ACCESS_CONTIGUOUS_DEFINE

#define NET_PKT_DATA_ACCESS_CONTIGUOUS_DEFINE	(		_name,
			_type
	)

#include <zephyr/net/net_pkt.h>

Value:

        struct net_pkt_data_access _name = {                    \
                .data = NULL,                                   \
                .size = sizeof(_type),                          \
        }

NET_PKT_DATA_ACCESS_DEFINE

#define NET_PKT_DATA_ACCESS_DEFINE	(		_name,
			_type
	)

#include <zephyr/net/net_pkt.h>

Value:

        _type _hdr_##_name;                                     \
        struct net_pkt_data_access _name = {                    \
                .data = &_hdr_##_name,                          \
                .size = sizeof(_type),                          \
        }

NET_PKT_DATA_POOL_DEFINE

#define NET_PKT_DATA_POOL_DEFINE	(		name,
			count
	)

#include <zephyr/net/net_pkt.h>

Value:

        NET_BUF_POOL_DEFINE(name, count, CONFIG_NET_BUF_DATA_SIZE,      \
                            0, NULL)

Create a data fragment net_buf pool.

A net_buf pool is used to store actual data for network packets. It must be coupled with a net_pkt slab (NET_PKT_SLAB_DEFINE) used to store the packet meta-information. The macro can be used by an application to define additional custom per-context TX packet pools (see net_context_setup_pools()).

Parameters

name	Name of the pool.
count	Number of net_buf in this pool.

net_pkt_print_frags

#define net_pkt_print_frags

(

pkt

)

#include <zephyr/net/net_pkt.h>

Print fragment list and the fragment sizes.

Only available if debugging is activated.

Parameters

pkt	Network pkt.

NET_PKT_SLAB_DEFINE

#define NET_PKT_SLAB_DEFINE	(		name,
			count
	)		K_MEM_SLAB_DEFINE(name, sizeof(struct net_pkt), count, 4)

#include <zephyr/net/net_pkt.h>

Create a net_pkt slab.

A net_pkt slab is used to store meta-information about network packets. It must be coupled with a data fragment pool (NET_PKT_DATA_POOL_DEFINE) used to store the actual packet data. The macro can be used by an application to define additional custom per-context TX packet slabs (see net_context_setup_pools()).

Parameters

name	Name of the slab.
count	Number of net_pkt in this slab.

NET_PKT_TX_SLAB_DEFINE

#define NET_PKT_TX_SLAB_DEFINE	(		name,
			count
	)		NET_PKT_SLAB_DEFINE(name, count)

#include <zephyr/net/net_pkt.h>

Function Documentation

net_pkt_acknowledge_data()

static int net_pkt_acknowledge_data ( struct net_pkt *  pkt, struct net_pkt_data_access *  access  )

inlinestatic

#include <zephyr/net/net_pkt.h>

Acknowledge previously contiguous data taken from a network packet Packet needs to be set to overwrite mode.

net_pkt_alloc()

struct net_pkt * net_pkt_alloc

(

k_timeout_t

timeout

)

#include <zephyr/net/net_pkt.h>

Allocate an initialized net_pkt.

for the time being, 2 pools are used. One for TX and one for RX. This allocator has to be used for TX.

Parameters

timeout

Maximum time to wait for an allocation.

Returns

a pointer to a newly allocated net_pkt on success, NULL otherwise.

net_pkt_alloc_buffer()

int net_pkt_alloc_buffer	(	struct net_pkt *	pkt,
		size_t	size,
		enum net_ip_protocol	proto,
		k_timeout_t	timeout
	)

#include <zephyr/net/net_pkt.h>

Allocate buffer for a net_pkt.

: such allocator will take into account space necessary for headers, MTU, and existing buffer (if any). Beware that, due to all these criteria, the allocated size might be smaller/bigger than requested one.

Parameters

pkt	The network packet requiring buffer to be allocated.
size	The size of buffer being requested.
proto	The IP protocol type (can be 0 for none).
timeout	Maximum time to wait for an allocation.

Returns

0 on success, negative errno code otherwise.

net_pkt_alloc_buffer_raw()

int net_pkt_alloc_buffer_raw	(	struct net_pkt *	pkt,
		size_t	size,
		k_timeout_t	timeout
	)

#include <zephyr/net/net_pkt.h>

Allocate buffer for a net_pkt, of specified size, w/o any additional preconditions.

: The actual buffer size may be larger than requested one if fixed size buffers are in use.

Parameters

pkt	The network packet requiring buffer to be allocated.
size	The size of buffer being requested.
timeout	Maximum time to wait for an allocation.

Returns

0 on success, negative errno code otherwise.

net_pkt_alloc_from_slab()

struct net_pkt * net_pkt_alloc_from_slab	(	struct k_mem_slab *	slab,
		k_timeout_t	timeout
	)

#include <zephyr/net/net_pkt.h>

Allocate an initialized net_pkt from a specific slab.

unlike net_pkt_alloc() which uses core slabs, this one will use an external slab (see NET_PKT_SLAB_DEFINE()). Do not use it unless you know what you are doing. Basically, only net_context should be using this, in order to allocate packet and then buffer on its local slab/pool (if any).

Parameters

slab	The slab to use for allocating the packet
timeout	Maximum time to wait for an allocation.

Returns

a pointer to a newly allocated net_pkt on success, NULL otherwise.

net_pkt_alloc_on_iface()

struct net_pkt * net_pkt_alloc_on_iface	(	struct net_if *	iface,
		k_timeout_t	timeout
	)

#include <zephyr/net/net_pkt.h>

Allocate a network packet for a specific network interface.

Parameters

iface	The network interface the packet is supposed to go through.
timeout	Maximum time to wait for an allocation.

Returns

a pointer to a newly allocated net_pkt on success, NULL otherwise.

net_pkt_alloc_with_buffer()

struct net_pkt * net_pkt_alloc_with_buffer	(	struct net_if *	iface,
		size_t	size,
		sa_family_t	family,
		enum net_ip_protocol	proto,
		k_timeout_t	timeout
	)

#include <zephyr/net/net_pkt.h>

Allocate a network packet and buffer at once.

Parameters

iface	The network interface the packet is supposed to go through.
size	The size of buffer.
family	The family to which the packet belongs.
proto	The IP protocol type (can be 0 for none).
timeout	Maximum time to wait for an allocation.

Returns

a pointer to a newly allocated net_pkt on success, NULL otherwise.

net_pkt_append_buffer()

void net_pkt_append_buffer	(	struct net_pkt *	pkt,
		struct net_buf *	buffer
	)

#include <zephyr/net/net_pkt.h>

Append a buffer in packet.

Parameters

pkt	Network packet where to append the buffer
buffer	Buffer to append

net_pkt_available_buffer()

size_t net_pkt_available_buffer

(

struct net_pkt *

pkt

)

#include <zephyr/net/net_pkt.h>

Get available buffer space from a pkt.

Note

Reserved bytes (headroom) in any of the fragments are not considered to be available.

Parameters

pkt	The net_pkt which buffer availability should be evaluated

Returns

the amount of buffer available

net_pkt_available_payload_buffer()

size_t net_pkt_available_payload_buffer	(	struct net_pkt *	pkt,
		enum net_ip_protocol	proto
	)

#include <zephyr/net/net_pkt.h>

Get available buffer space for payload from a pkt.

Note

Reserved bytes (headroom) in any of the fragments are not considered to be available.

Unlike net_pkt_available_buffer(), this will take into account the headers space.

Parameters

pkt	The net_pkt which payload buffer availability should be evaluated
proto	The IP protocol type (can be 0 for none).

Returns

the amount of buffer available for payload

net_pkt_clone()

struct net_pkt * net_pkt_clone	(	struct net_pkt *	pkt,
		k_timeout_t	timeout
	)

#include <zephyr/net/net_pkt.h>

Clone pkt and its buffer.

The cloned packet will be allocated on the same pool as the original one.

Parameters

pkt	Original pkt to be cloned
timeout	Timeout to wait for free buffer

Returns

NULL if error, cloned packet otherwise.

net_pkt_compact()

void net_pkt_compact

(

struct net_pkt *

pkt

)

#include <zephyr/net/net_pkt.h>

Compact the fragment list of a packet.

After this there is no more any free space in individual fragments.

Parameters

pkt	Network packet.

net_pkt_copy()

int net_pkt_copy	(	struct net_pkt *	pkt_dst,
		struct net_pkt *	pkt_src,
		size_t	length
	)

#include <zephyr/net/net_pkt.h>

Copy data from a packet into another one.

Both net_pkt cursors should be properly initialized and, if needed, positioned using net_pkt_skip. The cursors will be updated after the operation.

Parameters

pkt_dst	Destination network packet.
pkt_src	Source network packet.
length	Length of data to be copied.

Returns

0 on success, negative errno code otherwise.

net_pkt_cursor_backup()

static void net_pkt_cursor_backup ( struct net_pkt *  pkt, struct net_pkt_cursor *  backup  )

inlinestatic

#include <zephyr/net/net_pkt.h>

Backup net_pkt cursor.

Parameters

pkt	The net_pkt whose cursor is going to be backed up
backup	The cursor where to backup net_pkt cursor

net_pkt_cursor_get_pos()

static void * net_pkt_cursor_get_pos ( struct net_pkt *  pkt )

inlinestatic

#include <zephyr/net/net_pkt.h>

Returns current position of the cursor.

Parameters

pkt	The net_pkt whose cursor position is going to be returned

Returns

cursor's position

net_pkt_cursor_init()

void net_pkt_cursor_init

(

struct net_pkt *

pkt

)

#include <zephyr/net/net_pkt.h>

Initialize net_pkt cursor.

This will initialize the net_pkt cursor from its buffer.

Parameters

pkt	The net_pkt whose cursor is going to be initialized

net_pkt_cursor_restore()

static void net_pkt_cursor_restore ( struct net_pkt *  pkt, struct net_pkt_cursor *  backup  )

inlinestatic

#include <zephyr/net/net_pkt.h>

Restore net_pkt cursor from a backup.

Parameters

pkt	The net_pkt whose cursor is going to be restored
backup	The cursor from where to restore net_pkt cursor

net_pkt_frag_add()

void net_pkt_frag_add	(	struct net_pkt *	pkt,
		struct net_buf *	frag
	)

#include <zephyr/net/net_pkt.h>

Add a fragment to a packet at the end of its fragment list.

Parameters

pkt	pkt Network packet where to add the fragment
frag	Fragment to add

net_pkt_frag_del()

struct net_buf * net_pkt_frag_del	(	struct net_pkt *	pkt,
		struct net_buf *	parent,
		struct net_buf *	frag
	)

#include <zephyr/net/net_pkt.h>

Delete existing fragment from a packet.

Parameters

pkt	Network packet from which frag belongs to.
parent	parent fragment of frag, or NULL if none.
frag	Fragment to delete.

Returns

Pointer to the following fragment, or NULL if it had no further fragments.

net_pkt_frag_insert()

void net_pkt_frag_insert	(	struct net_pkt *	pkt,
		struct net_buf *	frag
	)

#include <zephyr/net/net_pkt.h>

Insert a fragment to a packet at the beginning of its fragment list.

Parameters

pkt	pkt Network packet where to insert the fragment
frag	Fragment to insert

net_pkt_frag_ref()

struct net_buf * net_pkt_frag_ref

(

struct net_buf *

frag

)

#include <zephyr/net/net_pkt.h>

Increase the packet fragment ref count.

Mark the fragment to be used still.

Parameters

frag	Network fragment to ref.

Returns

a pointer on the referenced Network fragment.

net_pkt_frag_unref()

void net_pkt_frag_unref

(

struct net_buf *

frag

)

#include <zephyr/net/net_pkt.h>

Decrease the packet fragment ref count.

Parameters

frag	Network fragment to unref.

net_pkt_get_contiguous_len()

size_t net_pkt_get_contiguous_len

(

struct net_pkt *

pkt

)

#include <zephyr/net/net_pkt.h>

Get the contiguous buffer space.

Parameters

pkt	Network packet

Returns

The available contiguous buffer space in bytes starting from the current cursor position. 0 in case of an error.

net_pkt_get_current_offset()

uint16_t net_pkt_get_current_offset

(

struct net_pkt *

pkt

)

#include <zephyr/net/net_pkt.h>

Get the actual offset in the packet from its cursor.

Parameters

pkt	Network packet.

Returns

a valid offset on success, 0 otherwise as there is nothing that can be done to evaluate the offset.

net_pkt_get_data()

void * net_pkt_get_data	(	struct net_pkt *	pkt,
		struct net_pkt_data_access *	access
	)

#include <zephyr/net/net_pkt.h>

Get data from a network packet in a contiguous way.

net_pkt's cursor should be properly initialized and, if needed, positioned using net_pkt_skip. Unlike other functions, cursor position will not be updated after the operation.

Parameters

pkt	The network packet from where to get the data.
access	A pointer to a valid net_pkt_data_access describing the data to get in a contiguous way.

Returns

a pointer to the requested contiguous data, NULL otherwise.

net_pkt_get_frag()

struct net_buf * net_pkt_get_frag	(	struct net_pkt *	pkt,
		size_t	min_len,
		k_timeout_t	timeout
	)

#include <zephyr/net/net_pkt.h>

Get a data fragment that might be from user specific buffer pool or from global DATA pool.

Parameters

pkt	Network packet.
min_len	Minimum length of the requested fragment.
timeout	Affects the action taken should the net buf pool be empty. If K_NO_WAIT, then return immediately. If K_FOREVER, then wait as long as necessary. Otherwise, wait up to the specified time.

Returns

Network buffer if successful, NULL otherwise.

net_pkt_get_info()

void net_pkt_get_info	(	struct k_mem_slab **	rx,
		struct k_mem_slab **	tx,
		struct net_buf_pool **	rx_data,
		struct net_buf_pool **	tx_data
	)

#include <zephyr/net/net_pkt.h>

Get information about predefined RX, TX and DATA pools.

Parameters

rx	Pointer to RX pool is returned.
tx	Pointer to TX pool is returned.
rx_data	Pointer to RX DATA pool is returned.
tx_data	Pointer to TX DATA pool is returned.

net_pkt_get_reserve_data()

struct net_buf * net_pkt_get_reserve_data	(	struct net_buf_pool *	pool,
		size_t	min_len,
		k_timeout_t	timeout
	)

#include <zephyr/net/net_pkt.h>

Get a data buffer from a given pool.

Normally this version is not useful for applications but is mainly used by network fragmentation code.

Parameters

pool	The net_buf pool to use.
min_len	Minimum length of the requested fragment.
timeout	Affects the action taken should the net buf pool be empty. If K_NO_WAIT, then return immediately. If K_FOREVER, then wait as long as necessary. Otherwise, wait up to the specified time.

Returns

Network buffer if successful, NULL otherwise.

net_pkt_get_reserve_rx_data()

struct net_buf * net_pkt_get_reserve_rx_data	(	size_t	min_len,
		k_timeout_t	timeout
	)

#include <zephyr/net/net_pkt.h>

Get RX DATA buffer from pool.

Normally you should use net_pkt_get_frag() instead.

Normally this version is not useful for applications but is mainly used by network fragmentation code.

Parameters

min_len	Minimum length of the requested fragment.
timeout	Affects the action taken should the net buf pool be empty. If K_NO_WAIT, then return immediately. If K_FOREVER, then wait as long as necessary. Otherwise, wait up to the specified time.

Returns

Network buffer if successful, NULL otherwise.

net_pkt_get_reserve_tx_data()

struct net_buf * net_pkt_get_reserve_tx_data	(	size_t	min_len,
		k_timeout_t	timeout
	)

#include <zephyr/net/net_pkt.h>

Get TX DATA buffer from pool.

Normally you should use net_pkt_get_frag() instead.

Normally this version is not useful for applications but is mainly used by network fragmentation code.

Parameters

min_len	Minimum length of the requested fragment.
timeout	Affects the action taken should the net buf pool be empty. If K_NO_WAIT, then return immediately. If K_FOREVER, then wait as long as necessary. Otherwise, wait up to the specified time.

Returns

Network buffer if successful, NULL otherwise.

net_pkt_is_contiguous()

bool net_pkt_is_contiguous	(	struct net_pkt *	pkt,
		size_t	size
	)

#include <zephyr/net/net_pkt.h>

Check if a data size could fit contiguously.

net_pkt's cursor should be properly initialized and, if needed, positioned using net_pkt_skip.

Parameters

pkt	Network packet.
size	The size to check for contiguity

Returns

true if that is the case, false otherwise.

net_pkt_memset()

int net_pkt_memset	(	struct net_pkt *	pkt,
		int	byte,
		size_t	length
	)

#include <zephyr/net/net_pkt.h>

Memset some data in a net_pkt.

net_pkt's cursor should be properly initialized and, if needed, positioned using net_pkt_skip. Cursor position will be updated after the operation.

Parameters

pkt	The net_pkt whose buffer to fill starting at the current cursor position.
byte	The byte to write in memory
length	Amount of data to memset with given byte

Returns

0 in success, negative errno code otherwise.

net_pkt_pull()

int net_pkt_pull	(	struct net_pkt *	pkt,
		size_t	length
	)

#include <zephyr/net/net_pkt.h>

Remove data from the packet at current location.

net_pkt's cursor should be properly initialized and, eventually, properly positioned using net_pkt_skip/read/write. Note that net_pkt's cursor is reset by this function.

Parameters

pkt	Network packet
length	Number of bytes to be removed

Returns

0 on success, negative errno code otherwise.

net_pkt_read()

int net_pkt_read	(	struct net_pkt *	pkt,
		void *	data,
		size_t	length
	)

#include <zephyr/net/net_pkt.h>

Read some data from a net_pkt.

net_pkt's cursor should be properly initialized and, if needed, positioned using net_pkt_skip. Cursor position will be updated after the operation.

Parameters

pkt	The network packet from where to read some data
data	The destination buffer where to copy the data
length	The amount of data to copy

Returns

0 on success, negative errno code otherwise.

net_pkt_read_be16()

int net_pkt_read_be16	(	struct net_pkt *	pkt,
		uint16_t *	data
	)

#include <zephyr/net/net_pkt.h>

Read uint16_t big endian data from a net_pkt.

net_pkt's cursor should be properly initialized and, if needed, positioned using net_pkt_skip. Cursor position will be updated after the operation.

Parameters

pkt	The network packet from where to read
data	The destination uint16_t where to copy the data

Returns

0 on success, negative errno code otherwise.

net_pkt_read_be32()

int net_pkt_read_be32	(	struct net_pkt *	pkt,
		uint32_t *	data
	)

#include <zephyr/net/net_pkt.h>

Read uint32_t big endian data from a net_pkt.

net_pkt's cursor should be properly initialized and, if needed, positioned using net_pkt_skip. Cursor position will be updated after the operation.

Parameters

pkt	The network packet from where to read
data	The destination uint32_t where to copy the data

Returns

0 on success, negative errno code otherwise.

net_pkt_read_le16()

int net_pkt_read_le16	(	struct net_pkt *	pkt,
		uint16_t *	data
	)

#include <zephyr/net/net_pkt.h>

Read uint16_t little endian data from a net_pkt.

net_pkt's cursor should be properly initialized and, if needed, positioned using net_pkt_skip. Cursor position will be updated after the operation.

Parameters

pkt	The network packet from where to read
data	The destination uint16_t where to copy the data

Returns

0 on success, negative errno code otherwise.

net_pkt_read_u8()

static int net_pkt_read_u8 ( struct net_pkt *  pkt, uint8_t *  data  )

inlinestatic

#include <zephyr/net/net_pkt.h>

net_pkt_ref()

struct net_pkt * net_pkt_ref

(

struct net_pkt *

pkt

)

#include <zephyr/net/net_pkt.h>

Increase the packet ref count.

Mark the packet to be used still.

Parameters

pkt	Network packet to ref.

Returns

Network packet if successful, NULL otherwise.

net_pkt_remaining_data()

size_t net_pkt_remaining_data

(

struct net_pkt *

pkt

)

#include <zephyr/net/net_pkt.h>

Get the amount of data which can be read from current cursor position.

Parameters

pkt	Network packet

Returns

Amount of data which can be read from current pkt cursor

net_pkt_remove_tail()

int net_pkt_remove_tail	(	struct net_pkt *	pkt,
		size_t	length
	)

#include <zephyr/net/net_pkt.h>

Remove length bytes from tail of packet.

This function does not take packet cursor into account. It is a helper to remove unneeded bytes from tail of packet (like appended CRC). It takes care of buffer deallocation if removed bytes span whole buffer(s).

Parameters

pkt	Network packet
length	Number of bytes to be removed

Return values

0	On success.
-EINVAL	If packet length is shorter than length.

net_pkt_rx_alloc()

struct net_pkt * net_pkt_rx_alloc

(

k_timeout_t

timeout

)

#include <zephyr/net/net_pkt.h>

Allocate an initialized net_pkt for RX.

for the time being, 2 pools are used. One for TX and one for RX. This allocator has to be used for RX.

Parameters

timeout

Maximum time to wait for an allocation.

Returns

a pointer to a newly allocated net_pkt on success, NULL otherwise.

net_pkt_rx_alloc_on_iface()

struct net_pkt * net_pkt_rx_alloc_on_iface	(	struct net_if *	iface,
		k_timeout_t	timeout
	)

#include <zephyr/net/net_pkt.h>

net_pkt_rx_alloc_with_buffer()

struct net_pkt * net_pkt_rx_alloc_with_buffer	(	struct net_if *	iface,
		size_t	size,
		sa_family_t	family,
		enum net_ip_protocol	proto,
		k_timeout_t	timeout
	)

#include <zephyr/net/net_pkt.h>

net_pkt_rx_clone()

struct net_pkt * net_pkt_rx_clone	(	struct net_pkt *	pkt,
		k_timeout_t	timeout
	)

#include <zephyr/net/net_pkt.h>

Clone pkt and its buffer.

The cloned packet will be allocated on the RX packet poll.

Parameters

pkt	Original pkt to be cloned
timeout	Timeout to wait for free buffer

Returns

NULL if error, cloned packet otherwise.

net_pkt_set_data()

int net_pkt_set_data	(	struct net_pkt *	pkt,
		struct net_pkt_data_access *	access
	)

#include <zephyr/net/net_pkt.h>

Set contiguous data into a network packet.

net_pkt's cursor should be properly initialized and, if needed, positioned using net_pkt_skip. Cursor position will be updated after the operation.

Parameters

pkt	The network packet to where the data should be set.
access	A pointer to a valid net_pkt_data_access describing the data to set.

Returns

0 on success, a negative errno otherwise.

net_pkt_shallow_clone()

struct net_pkt * net_pkt_shallow_clone	(	struct net_pkt *	pkt,
		k_timeout_t	timeout
	)

#include <zephyr/net/net_pkt.h>

Clone pkt and increase the refcount of its buffer.

Parameters

pkt	Original pkt to be shallow cloned
timeout	Timeout to wait for free packet

Returns

NULL if error, cloned packet otherwise.

net_pkt_skip()

int net_pkt_skip	(	struct net_pkt *	pkt,
		size_t	length
	)

#include <zephyr/net/net_pkt.h>

Skip some data from a net_pkt.

net_pkt's cursor should be properly initialized Cursor position will be updated after the operation. Depending on the value of pkt->overwrite bit, this function will affect the buffer length or not. If it's true, it will advance the cursor to the requested length. If it's false, it will do the same but if the cursor was already also at the end of existing data, it will increment the buffer length. So in this case, its behavior is just like net_pkt_write or net_pkt_memset, difference being that it will not affect the buffer content itself (which may be just garbage then).

Parameters

pkt	The net_pkt whose cursor will be updated to skip given amount of data from the buffer.
length	Amount of data to skip in the buffer

Returns

0 in success, negative errno code otherwise.

net_pkt_trim_buffer()

void net_pkt_trim_buffer

(

struct net_pkt *

pkt

)

#include <zephyr/net/net_pkt.h>

Trim net_pkt buffer.

This will basically check for unused buffers and deallocate them relevantly

Parameters

pkt	The net_pkt which buffer will be trimmed

net_pkt_unref()

void net_pkt_unref

(

struct net_pkt *

pkt

)

#include <zephyr/net/net_pkt.h>

Place packet back into the available packets slab.

Releases the packet to other use. This needs to be called by application after it has finished with the packet.

Parameters

pkt	Network packet to release.

net_pkt_update_length()

int net_pkt_update_length	(	struct net_pkt *	pkt,
		size_t	length
	)

#include <zephyr/net/net_pkt.h>

Update the overall length of a packet.

Unlike net_pkt_pull() below, this does not take packet cursor into account. It's mainly a helper dedicated for ipv4 and ipv6 input functions. It shrinks the overall length by given parameter.

Parameters

pkt	Network packet
length	The new length of the packet

Returns

0 on success, negative errno code otherwise.

net_pkt_write()

int net_pkt_write	(	struct net_pkt *	pkt,
		const void *	data,
		size_t	length
	)

#include <zephyr/net/net_pkt.h>

Write data into a net_pkt.

net_pkt's cursor should be properly initialized and, if needed, positioned using net_pkt_skip. Cursor position will be updated after the operation.

Parameters

pkt	The network packet where to write
data	Data to be written
length	Length of the data to be written

Returns

0 on success, negative errno code otherwise.

net_pkt_write_be16()

static int net_pkt_write_be16 ( struct net_pkt *  pkt, uint16_t  data  )

inlinestatic

#include <zephyr/net/net_pkt.h>

net_pkt_write_be32()

static int net_pkt_write_be32 ( struct net_pkt *  pkt, uint32_t  data  )

inlinestatic

#include <zephyr/net/net_pkt.h>

net_pkt_write_le16()

static int net_pkt_write_le16 ( struct net_pkt *  pkt, uint16_t  data  )

inlinestatic

#include <zephyr/net/net_pkt.h>

net_pkt_write_le32()

static int net_pkt_write_le32 ( struct net_pkt *  pkt, uint32_t  data  )

inlinestatic

#include <zephyr/net/net_pkt.h>

net_pkt_write_u8()

static int net_pkt_write_u8 ( struct net_pkt *  pkt, uint8_t  data  )

inlinestatic

#include <zephyr/net/net_pkt.h>