net_pkt.h File Reference

Network packet buffer descriptor API. More...

#include <zephyr/types.h>
#include <stdbool.h>
#include <zephyr/net/buf.h>
#include <zephyr/net/net_core.h>
#include <zephyr/net/net_linkaddr.h>
#include <zephyr/net/net_ip.h>
#include <zephyr/net/net_if.h>
#include <zephyr/net/net_context.h>
#include <zephyr/net/net_time.h>
#include <zephyr/net/ethernet_vlan.h>
#include <zephyr/net/ptp_time.h>

Go to the source code of this file.

Data Structures
struct	net_pkt
	Network packet. More...

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_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.

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.
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.
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)
	Read a byte (uint8_t) from a net_pkt.
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)
	Write a byte (uint8_t) data to a net_pkt.
static int	net_pkt_write_be16 (struct net_pkt *pkt, uint16_t data)
	Write a uint16_t big endian data to a net_pkt.
static int	net_pkt_write_be32 (struct net_pkt *pkt, uint32_t data)
	Write a uint32_t big endian data to a net_pkt.
static int	net_pkt_write_le32 (struct net_pkt *pkt, uint32_t data)
	Write a uint32_t little endian data to a net_pkt.
static int	net_pkt_write_le16 (struct net_pkt *pkt, uint16_t data)
	Write a uint16_t little endian data to a net_pkt.
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 buffer descriptor API.

Network data is passed between different parts of the stack via net_buf struct.