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-rw-r--r--src/vnet/interface_output.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/vnet/interface_output.h b/src/vnet/interface_output.h
index 6b766d36c4f..bfd2066c2a8 100644
--- a/src/vnet/interface_output.h
+++ b/src/vnet/interface_output.h
@@ -87,6 +87,9 @@ vnet_calc_checksums_inline (vlib_main_t * vm, vlib_buffer_t * b,
udp_header_t *uh;
u32 oflags = vnet_buffer2 (b)->oflags;
+ if (!(b->flags & VNET_BUFFER_F_OFFLOAD))
+ return;
+
ASSERT (!(is_ip4 && is_ip6));
ip4 = (ip4_header_t *) (b->data + vnet_buffer (b)->l3_hdr_offset);