diff --git a/src/include/ip_checksum.h b/src/include/ip_checksum.h
new file mode 100644
index 0000000..c2cb938
--- /dev/null
+++ b/src/include/ip_checksum.h
@@ -0,0 +1,7 @@
+#ifndef IP_CHECKSUM_H
+#define IP_CHECKSUM_H
+
+unsigned long compute_ip_checksum(void *addr, unsigned long length);
+unsigned long add_ip_checksums(unsigned long offset, unsigned long sum, unsigned long new);
+
+#endif /* IP_CHECKSUM_H */