1 files changed, 8 insertions, 0 deletions
diff --git a/pkg/tcpip/header/ipv4.go b/pkg/tcpip/header/ipv4.go
index 7da4c4845..94a3af289 100644
--- a/pkg/tcpip/header/ipv4.go
+++ b/pkg/tcpip/header/ipv4.go
@@ -85,6 +85,10 @@ const (
 	// units, the header cannot exceed 15*4 = 60 bytes.
 	IPv4MaximumHeaderSize = 60
 
+	// MinIPFragmentPayloadSize is the minimum number of payload bytes that
+	// the first fragment must carry when an IPv4 packet is fragmented.
+	MinIPFragmentPayloadSize = 8
+
 	// IPv4AddressSize is the size, in bytes, of an IPv4 address.
 	IPv4AddressSize = 4
 
@@ -268,6 +272,10 @@ func (b IPv4) IsValid(pktSize int) bool {
 		return false
 	}
 
+	if IPVersion(b) != IPv4Version {
+		return false
+	}
+
 	return true
 }