2 files changed, 2 insertions, 0 deletions
diff --git a/lib/ipv4.h b/lib/ipv4.h
index 033116b..49aa13a 100644
--- a/lib/ipv4.h
+++ b/lib/ipv4.h
@@ -37,6 +37,7 @@ typedef u32 ip_addr;
 
 #define BITS_PER_IP_ADDRESS 32
 #define STD_ADDRESS_P_LENGTH 15
+#define SIZE_OF_IP_HEADER 24
 
 #define IPA_NONE (_MI(0))
 
diff --git a/lib/ipv6.h b/lib/ipv6.h
index 90aedb9..2efd9e6 100644
--- a/lib/ipv6.h
+++ b/lib/ipv6.h
@@ -24,6 +24,7 @@ typedef struct ipv6_addr {
 
 #define BITS_PER_IP_ADDRESS 128
 #define STD_ADDRESS_P_LENGTH 39
+#define SIZE_OF_IP_HEADER 40
 
 #define IPA_NONE _MI(0,0,0,0)