From 5acf5ea4bc1535657692c509092caddec3d719ff Mon Sep 17 00:00:00 2001 From: Dmitry Fleytman Date: Sat, 9 Mar 2013 11:21:02 +0200 Subject: 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 Signed-off-by: Yan Vugenfirer Signed-off-by: Stefan Hajnoczi --- net/checksum.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) (limited to 'net') diff --git a/net/checksum.c b/net/checksum.c index 9919b2e5fd..4fa5563e7c 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; } -- cgit v1.2.1