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| author | Dmitry Fleytman <dmitry@daynix.com> | 2013-03-09 11:21:02 +0200 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2013-03-25 11:13:09 +0100 |
| commit | 5acf5ea4bc1535657692c509092caddec3d719ff (patch) | |
| tree | a8e2197110557aab3f55c1021997e0d14af10dc1 /net | |
| parent | 20048d0a12b1080f688ff9b82696134df1aa3607 (diff) | |
| download | qemu-5acf5ea4bc1535657692c509092caddec3d719ff.zip qemu-5acf5ea4bc1535657692c509092caddec3d719ff.tar.gz qemu-5acf5ea4bc1535657692c509092caddec3d719ff.tar.bz2 | |
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.c | 13 |
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; } |