Fixed IPv4 checksum (network byte order, dimwit)

diff --git a/Modules/IPStack/ipv4.c b/Modules/IPStack/ipv4.c
index e37085b..31d6f02 100644 (file)
--- a/Modules/IPStack/ipv4.c
+++ b/Modules/IPStack/ipv4.c
@@ -284,9 +284,10 @@ Uint16 IPv4_Checksum(const void *Buf, int Size)
        Size = (Size + 1) >> 1; // 16-bit word count
        for(i = 0; i < Size; i++ )
        {
-               if((int)sum + arr[i] > 0xFFFF)
+               Uint16  val = ntohs(arr[i]);
+               if((int)sum + val > 0xFFFF)
                        sum ++; // Simulate 1's complement
-               sum += arr[i];
+               sum += val;
        }
        return ~sum ;
 }