1 files changed, 75 insertions, 0 deletions
diff --git a/pkg/tcpip/header/ipv4_test.go b/pkg/tcpip/header/ipv4_test.go
index 6475cd694..c02fe898b 100644
--- a/pkg/tcpip/header/ipv4_test.go
+++ b/pkg/tcpip/header/ipv4_test.go
@@ -18,6 +18,7 @@ import (
 	"testing"
 
 	"github.com/google/go-cmp/cmp"
+	"gvisor.dev/gvisor/pkg/tcpip"
 	"gvisor.dev/gvisor/pkg/tcpip/buffer"
 	"gvisor.dev/gvisor/pkg/tcpip/header"
 )
@@ -177,3 +178,77 @@ func TestIPv4EncodeOptions(t *testing.T) {
 		})
 	}
 }
+
+func TestIsV4LinkLocalUnicastAddress(t *testing.T) {
+	tests := []struct {
+		name     string
+		addr     tcpip.Address
+		expected bool
+	}{
+		{
+			name:     "Valid (lowest)",
+			addr:     "\xa9\xfe\x00\x00",
+			expected: true,
+		},
+		{
+			name:     "Valid (highest)",
+			addr:     "\xa9\xfe\xff\xff",
+			expected: true,
+		},
+		{
+			name:     "Invalid (before subnet)",
+			addr:     "\xa9\xfd\xff\xff",
+			expected: false,
+		},
+		{
+			name:     "Invalid (after subnet)",
+			addr:     "\xa9\xff\x00\x00",
+			expected: false,
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			if got := header.IsV4LinkLocalUnicastAddress(test.addr); got != test.expected {
+				t.Errorf("got header.IsV4LinkLocalUnicastAddress(%s) = %t, want = %t", test.addr, got, test.expected)
+			}
+		})
+	}
+}
+
+func TestIsV4LinkLocalMulticastAddress(t *testing.T) {
+	tests := []struct {
+		name     string
+		addr     tcpip.Address
+		expected bool
+	}{
+		{
+			name:     "Valid (lowest)",
+			addr:     "\xe0\x00\x00\x00",
+			expected: true,
+		},
+		{
+			name:     "Valid (highest)",
+			addr:     "\xe0\x00\x00\xff",
+			expected: true,
+		},
+		{
+			name:     "Invalid (before subnet)",
+			addr:     "\xdf\xff\xff\xff",
+			expected: false,
+		},
+		{
+			name:     "Invalid (after subnet)",
+			addr:     "\xe0\x00\x01\x00",
+			expected: false,
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			if got := header.IsV4LinkLocalMulticastAddress(test.addr); got != test.expected {
+				t.Errorf("got header.IsV4LinkLocalMulticastAddress(%s) = %t, want = %t", test.addr, got, test.expected)
+			}
+		})
+	}
+}