#include "net/opt.h"
#include "net/pbuf.h"
#include "net/ip_addr.h"

Include dependency graph for inet_chksum.h:

This graph shows which files directly or indirectly include this file:

Macros
#define	FOLD_U32T(u) (((u) >> 16) + ((u) & 0x0000ffffUL))

#define	LWIP_CHKSUM_COPY_ALGORITHM 0

#define	SWAP_BYTES_IN_WORD(w) (((w) & 0xff) << 8) \| (((w) & 0xff00) >> 8)

Functions
u16_t	inet_chksum (const void *dataptr, u16_t len)

u16_t	inet_chksum_pbuf (struct pbuf *p)

u16_t	ip_chksum_pseudo (struct pbuf p, u8_t proto, u16_t proto_len, const ip_addr_t src, const ip_addr_t *dest)

u16_t	ip_chksum_pseudo_partial (struct pbuf p, u8_t proto, u16_t proto_len, u16_t chksum_len, const ip_addr_t src, const ip_addr_t *dest)

Detailed Description

IP checksum calculation functions

Definition in file inet_chksum.h.

Macro Definition Documentation

◆ FOLD_U32T

#define FOLD_U32T ( u ) (((u) >> 16) + ((u) & 0x0000ffffUL))

Split an u32_t in two u16_ts and add them up

Definition at line 52 of file inet_chksum.h.

◆ LWIP_CHKSUM_COPY_ALGORITHM

#define LWIP_CHKSUM_COPY_ALGORITHM 0

Definition at line 67 of file inet_chksum.h.

◆ SWAP_BYTES_IN_WORD

#define SWAP_BYTES_IN_WORD ( w ) (((w) & 0xff) << 8) | (((w) & 0xff00) >> 8)

Swap the bytes in an u16_t: much like lwip_htons() for little-endian

Definition at line 47 of file inet_chksum.h.

Function Documentation

◆ inet_chksum()

u16_t inet_chksum	(	const void *	dataptr,
		u16_t	len
	)

Definition at line 555 of file inet_chksum.c.

References pbuf::len, and LWIP_CHKSUM.

◆ inet_chksum_pbuf()

u16_t inet_chksum_pbuf ( struct pbuf * p )

Calculate a checksum over a chain of pbufs (without pseudo-header, much like inet_chksum only pbufs are used).

Parameters

p	pbuf chain over that the checksum should be calculated

Returns: checksum (as u16_t) to be saved directly in the protocol header

Definition at line 568 of file inet_chksum.c.

References FOLD_U32T, pbuf::len, LWIP_CHKSUM, pbuf::next, NULL, pbuf::payload, and SWAP_BYTES_IN_WORD.

◆ ip_chksum_pseudo()

u16_t ip_chksum_pseudo	(	struct pbuf *	p,
		u8_t	proto,
		u16_t	proto_len,
		const ip_addr_t *	src,
		const ip_addr_t *	dest
	)

Definition at line 379 of file inet_chksum.c.

References ip_2_ip6, and IP_IS_V6.

◆ ip_chksum_pseudo_partial()

u16_t ip_chksum_pseudo_partial	(	struct pbuf *	p,
		u8_t	proto,
		u16_t	proto_len,
		u16_t	chksum_len,
		const ip_addr_t *	src,
		const ip_addr_t *	dest
	)

Definition at line 526 of file inet_chksum.c.