#include "lwip/opt.h"
#include "lwip/inet_chksum.h"
#include "lwip/def.h"
#include "lwip/ip_addr.h"
#include <string.h>

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Macros
#define	LWIP_CHKSUM lwip_standard_chksum

#define	LWIP_CHKSUM_ALGORITHM 2

Functions
u16_t	lwip_standard_chksum (const void *dataptr, int len)

static u16_t	inet_cksum_pseudo_base (struct pbuf *p, u8_t proto, u16_t proto_len, u32_t acc)

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)

static u16_t	inet_cksum_pseudo_partial_base (struct pbuf *p, u8_t proto, u16_t proto_len, u16_t chksum_len, u32_t acc)

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)

u16_t	inet_chksum (const void *dataptr, u16_t len)

u16_t	inet_chksum_pbuf (struct pbuf *p)

Detailed Description

Internet checksum functions.
These are some reference implementations of the checksum algorithm, with the aim of being simple, correct and fully portable. Checksumming is the first thing you would want to optimize for your platform. If you create your own version, link it in and in your cc.h put:

#define LWIP_CHKSUM your_checksum_routine

Or you can select from the implementations below by defining LWIP_CHKSUM_ALGORITHM to 1, 2 or 3.

Macro Definition Documentation

◆ LWIP_CHKSUM

#define LWIP_CHKSUM lwip_standard_chksum

◆ LWIP_CHKSUM_ALGORITHM

#define LWIP_CHKSUM_ALGORITHM 2

Function Documentation

◆ inet_chksum()

u16_t inet_chksum	(	const void *	dataptr,
		u16_t	len
	)

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

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

◆ inet_cksum_pseudo_base()

static u16_t inet_cksum_pseudo_base	(	struct pbuf *	p,
		u8_t	proto,
		u16_t	proto_len,
		u32_t	acc
	)

static

Parts of the pseudo checksum which are common to IPv4 and IPv6

References FOLD_U32T, INET_DEBUG, LWIP_CHKSUM, LWIP_DEBUGF, lwip_htons(), pbuf::next, NULL, SWAP_BYTES_IN_WORD, and X32_F.

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◆ inet_cksum_pseudo_partial_base()

static u16_t inet_cksum_pseudo_partial_base	(	struct pbuf *	p,
		u8_t	proto,
		u16_t	proto_len,
		u16_t	chksum_len,
		u32_t	acc
	)

static

Parts of the pseudo checksum which are common to IPv4 and IPv6

References FOLD_U32T, INET_DEBUG, LWIP_ASSERT, LWIP_CHKSUM, LWIP_DEBUGF, lwip_htons(), pbuf::next, NULL, SWAP_BYTES_IN_WORD, and X32_F.

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◆ 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
	)

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
	)