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authorDmitry Fleytman <dmitry@daynix.com>2013-03-09 11:21:02 +0200
committerStefan Hajnoczi <stefanha@redhat.com>2013-03-25 11:13:09 +0100
commit5acf5ea4bc1535657692c509092caddec3d719ff (patch)
treea8e2197110557aab3f55c1021997e0d14af10dc1 /net
parent20048d0a12b1080f688ff9b82696134df1aa3607 (diff)
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Checksum-related utility functions
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>
Diffstat (limited to 'net')
-rw-r--r--net/checksum.c13
1 files changed, 7 insertions, 6 deletions
diff --git a/net/checksum.c b/net/checksum.c
index 9919b2e..4fa5563 100644
--- a/net/checksum.c
+++ b/net/checksum.c
@@ -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;
}