1 files changed, 9 insertions, 1 deletions
diff --git a/pkg/tcpip/header/ipv4.go b/pkg/tcpip/header/ipv4.go
index 96e461491..94a3af289 100644
--- a/pkg/tcpip/header/ipv4.go
+++ b/pkg/tcpip/header/ipv4.go
@@ -17,7 +17,7 @@ package header
 import (
 	"encoding/binary"
 
-	"gvisor.googlesource.com/gvisor/pkg/tcpip"
+	"gvisor.dev/gvisor/pkg/tcpip"
 )
 
 const (
@@ -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
 }