inet_chksum.c File Reference

Incluse internet checksum functions.

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

Macros
#define	LWIP_CHKSUM   lwip_standard_chksum
#define	LWIP_CHKSUM_ALGORITHM   2

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). More...
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)
static u16_t	lwip_standard_chksum (void *dataptr, int len)

#define LWIP_CHKSUM   lwip_standard_chksum

Referenced by inet_chksum(), inet_chksum_pbuf(), inet_chksum_pseudo(), and inet_chksum_pseudo_partial().

#define LWIP_CHKSUM_ALGORITHM   2

u16_t inet_chksum	(	void *	dataptr,
		u16_t	len
	)

References LWIP_CHKSUM.

Referenced by icmp_input(), icmp_send_response(), ip_frag(), ip_input(), ip_reass(), and tcp_write().

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.

Referenced by icmp_input().

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

References FOLD_U32T, htons, INET_DEBUG, ip4_addr_get_u32, pbuf::len, LWIP_CHKSUM, LWIP_DEBUGF, pbuf::next, NULL, pbuf::payload, SWAP_BYTES_IN_WORD, and X32_F.

Referenced by tcp_input(), tcp_keepalive(), tcp_output_segment(), tcp_rst(), tcp_send_empty_ack(), tcp_zero_window_probe(), and udp_input().

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
	)

References FOLD_U32T, htons, INET_DEBUG, ip4_addr_get_u32, pbuf::len, LWIP_ASSERT, LWIP_CHKSUM, LWIP_DEBUGF, pbuf::next, NULL, pbuf::payload, SWAP_BYTES_IN_WORD, and X32_F.

Referenced by tcp_output_segment(), and udp_input().

static u16_t lwip_standard_chksum ( void *  dataptr, int  len  )

static

References FOLD_U32T, and SWAP_BYTES_IN_WORD.