Add Client Link-Layer Address option for RFC 6939 support.

Signed-off-by: Tom McPhail <tom.mcphail@icloud.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/dhcpv6/dhcpv6relay.go b/dhcpv6/dhcpv6relay.go
index 9c08e00..26d6ed4 100644
--- a/dhcpv6/dhcpv6relay.go
+++ b/dhcpv6/dhcpv6relay.go
@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"net"
 
+	"github.com/insomniacslk/dhcp/iana"
 	"github.com/u-root/u-root/pkg/uio"
 )
 
@@ -54,6 +55,19 @@ func (ro RelayOptions) RemoteID() *OptRemoteID {
 	return nil
 }
 
+// ClientLinkLayerAddress returns the Hardware Type and
+// Link Layer Address of the requesting client in this relay message.
+func (ro RelayOptions) ClientLinkLayerAddress() (iana.HWType, net.HardwareAddr) {
+	opt := ro.Options.GetOne(OptionClientLinkLayerAddr)
+	if opt == nil {
+		return 0, nil
+	}
+	if lla, ok := opt.(*optClientLinkLayerAddress); ok {
+		return lla.LinkLayerType, lla.LinkLayerAddress
+	}
+	return 0, nil
+}
+
 // RelayMessage is a DHCPv6 relay agent message as defined by RFC 3315 Section
 // 7.
 type RelayMessage struct {