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Checksum-related utility functions

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net_checksum_add_cont()
checksum calculation for scattered data with odd chunk sizes

net_raw_checksum()
checksum calculation for a buffer

Signed-off-by: Dmitry Fleytman <dmitry@daynix.com>
Signed-off-by: Yan Vugenfirer <yan@daynix.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Dmitry Fleytman 2013-03-09 11:21:02 +02:00 • committed by Stefan Hajnoczi
parent 20048d0a12
commit 5acf5ea4bc
2 changed files with 20 additions and 7 deletions
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13
net/checksum.c
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@ -20,16 +20,17 @@
#define PROTO_TCP 6
#define PROTO_UDP 17
uint32_t net_checksum_add(int len, uint8_t *buf)
uint32_t net_checksum_add_cont(int len, uint8_t *buf, int seq)
{
uint32_t sum = 0;
int i;
for (i = 0; i < len; i++) {
if (i & 1)
sum += (uint32_t)buf[i];
else
sum += (uint32_t)buf[i] << 8;
for (i = seq; i < seq + len; i++) {
if (i & 1) {
sum += (uint32_t)buf[i - seq];
} else {
sum += (uint32_t)buf[i - seq] << 8;
}
}
return sum;
}