Rename IsV6LinkLocalAddress to IsV6LinkLocalUnicastAddress

To match the V4 variant.

PiperOrigin-RevId: 367691981

2 files changed, 13 insertions, 12 deletions

diff --git a/pkg/tcpip/header/ipv6.go b/pkg/tcpip/header/ipv6.go
index fa6ccff30..c3a0407ac 100644
--- a/pkg/tcpip/header/ipv6.go
+++ b/pkg/tcpip/header/ipv6.go
@@ -391,23 +391,23 @@ func LinkLocalAddr(linkAddr tcpip.LinkAddress) tcpip.Address {
 	return tcpip.Address(lladdrb[:])
 }
 
-// IsV6LinkLocalAddress determines if the provided address is an IPv6
-// link-local address (fe80::/10).
-func IsV6LinkLocalAddress(addr tcpip.Address) bool {
+// IsV6LinkLocalUnicastAddress returns true iff the provided address is an IPv6
+// link-local unicast address, as defined by RFC 4291 section 2.5.6.
+func IsV6LinkLocalUnicastAddress(addr tcpip.Address) bool {
 	if len(addr) != IPv6AddressSize {
 		return false
 	}
 	return addr[0] == 0xfe && (addr[1]&0xc0) == 0x80
 }
 
-// IsV6LoopbackAddress determines if the provided address is an IPv6 loopback
-// address.
+// IsV6LoopbackAddress returns true iff the provided address is an IPv6 loopback
+// address, as defined by RFC 4291 section 2.5.3.
 func IsV6LoopbackAddress(addr tcpip.Address) bool {
 	return addr == IPv6Loopback
 }
 
-// IsV6LinkLocalMulticastAddress determines if the provided address is an IPv6
-// link-local multicast address.
+// IsV6LinkLocalMulticastAddress returns true iff the provided address is an
+// IPv6 link-local multicast address, as defined by RFC 4291 section 2.7.
 func IsV6LinkLocalMulticastAddress(addr tcpip.Address) bool {
 	return IsV6MulticastAddress(addr) && V6MulticastScope(addr) == IPv6LinkLocalMulticastScope
 }
@@ -472,7 +472,7 @@ func ScopeForIPv6Address(addr tcpip.Address) (IPv6AddressScope, tcpip.Error) {
 	case IsV6LinkLocalMulticastAddress(addr):
 		return LinkLocalScope, nil
 
-	case IsV6LinkLocalAddress(addr):
+	case IsV6LinkLocalUnicastAddress(addr):
 		return LinkLocalScope, nil
 
 	default:
@@ -531,7 +531,8 @@ func GenerateTempIPv6SLAACAddr(tempIIDHistory []byte, stableAddr tcpip.Address)
 	}
 }
 
-// IPv6MulticastScope is the scope of a multicast IPv6 address.
+// IPv6MulticastScope is the scope of a multicast IPv6 address, as defined by
+// RFC 7346 section 2.
 type IPv6MulticastScope uint8
 
 // The various values for IPv6 multicast scopes, as per RFC 7346 section 2:
diff --git a/pkg/tcpip/header/ipv6_test.go b/pkg/tcpip/header/ipv6_test.go
index 38b6dbc18..ccee9000e 100644
--- a/pkg/tcpip/header/ipv6_test.go
+++ b/pkg/tcpip/header/ipv6_test.go
@@ -252,7 +252,7 @@ func TestIsV6LinkLocalMulticastAddress(t *testing.T) {
 	}
 }
 
-func TestIsV6LinkLocalAddress(t *testing.T) {
+func TestIsV6LinkLocalUnicastAddress(t *testing.T) {
 	tests := []struct {
 		name     string
 		addr     tcpip.Address
@@ -287,8 +287,8 @@ func TestIsV6LinkLocalAddress(t *testing.T) {
 
 	for _, test := range tests {
 		t.Run(test.name, func(t *testing.T) {
-			if got := header.IsV6LinkLocalAddress(test.addr); got != test.expected {
-				t.Errorf("got header.IsV6LinkLocalAddress(%s) = %t, want = %t", test.addr, got, test.expected)
+			if got := header.IsV6LinkLocalUnicastAddress(test.addr); got != test.expected {
+				t.Errorf("got header.IsV6LinkLocalUnicastAddress(%s) = %t, want = %t", test.addr, got, test.expected)
 			}
 		})
 	}