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net: Add a separate file for IP checksumming

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Move the checksum code out into its own file so it can be used elsewhere.
Also use a new version which supports a length which is not a multiple of
2 and add a new function to add two checksums.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
2015-01-19 22:16:07 -07:00
parent 5da38086bd
commit 9b0e35cb48
3 changed files with 91 additions and 0 deletions
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30
include/net.h
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@@ -482,6 +482,36 @@ extern void net_set_ip_header(uchar *pkt, IPaddr_t dest, IPaddr_t source);
extern void net_set_udp_header(uchar *pkt, IPaddr_t dest, int dport,
int sport, int len);
/**
* compute_ip_checksum() - Compute IP checksum
*
* @addr: Address to check (must be 16-bit aligned)
* @nbytes: Number of bytes to check (normally a multiple of 2)
* @return 16-bit IP checksum
*/
unsigned compute_ip_checksum(const void *addr, unsigned nbytes);
/**
* add_ip_checksums() - add two IP checksums
*
* @offset: Offset of first sum (if odd we do a byte-swap)
* @sum: First checksum
* @new_sum: New checksum to add
* @return updated 16-bit IP checksum
*/
unsigned add_ip_checksums(unsigned offset, unsigned sum, unsigned new_sum);
/**
* ip_checksum_ok() - check if a checksum is correct
*
* This works by making sure the checksum sums to 0
*
* @addr: Address to check (must be 16-bit aligned)
* @nbytes: Number of bytes to check (normally a multiple of 2)
* @return true if the checksum matches, false if not
*/
int ip_checksum_ok(const void *addr, unsigned nbytes);
/* Checksum */
extern int NetCksumOk(uchar *, int); /* Return true if cksum OK */
extern uint NetCksum(uchar *, int); /* Calculate the checksum */