alexb/lib/lwip/contrib/src/include/ipv4/lwip/inet_chksum.h File Reference

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

Defines
#define	SWAP_BYTES_IN_WORD(w)   (((w) & 0xff) << 8) | (((w) & 0xff00) >> 8)
	Swap the bytes in an u16_t: much like htons() for little-endian.
#define	FOLD_U32T(u)   (((u) >> 16) + ((u) & 0x0000ffffUL))
	Split an u32_t in two u16_ts and add them up.
#define	LWIP_CHKSUM_COPY_ALGORITHM   0
Functions
u16_t	inet_chksum (void *dataptr, u16_t len)
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).
u16_t	inet_chksum_pseudo (struct pbuf *p, ip_addr_t *src, ip_addr_t *dest, u8_t proto, u16_t proto_len)
u16_t	inet_chksum_pseudo_partial (struct pbuf *p, ip_addr_t *src, ip_addr_t *dest, u8_t proto, u16_t proto_len, u16_t chksum_len)

---

Define Documentation

#define FOLD_U32T

(

u

)

(((u) >> 16) + ((u) & 0x0000ffffUL))

Split an u32_t in two u16_ts and add them up.

#define LWIP_CHKSUM_COPY_ALGORITHM   0

#define SWAP_BYTES_IN_WORD

(

w

)

(((w) & 0xff) << 8) | (((w) & 0xff00) >> 8)

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

---

Function Documentation

u16_t inet_chksum	(	void *	dataptr,
		u16_t	len
	)

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

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

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