Update code to compute checksum for buffer chains

[vpp.git] / src / vnet / ip / ip.h

diff --git a/src/vnet/ip/ip.h b/src/vnet/ip/ip.h
index 50965d4..b114fcb 100644 (file)
--- a/src/vnet/ip/ip.h
+++ b/src/vnet/ip/ip.h
@@ -162,7 +162,7 @@ ip_incremental_checksum_buffer (vlib_main_t * vm,
   void *h;
   u32 n;
 
-  n = clib_min (n_bytes_left, b->current_length);
+  n = clib_min (n_bytes_left, b->current_length - first_buffer_offset);
   h = vlib_buffer_get_current (b) + first_buffer_offset;
   sum = ip_incremental_checksum (sum, h, n);
   if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT))