1 files changed, 2 insertions, 0 deletions

diff --git a/util.h b/util.h
new file mode 100644
index 0000000..282820c
--- /dev/null
+++ b/util.h
@@ -0,0 +1,2 @@
+uint16_t csum_fold(uint32_t sum);
+uint16_t csum_ip4(void *buf, size_t len);