1 files changed, 61 insertions, 0 deletions
diff --git a/dhcpv6/option_iapd.go b/dhcpv6/option_iapd.go
new file mode 100644
index 0000000..03f3744
--- /dev/null
+++ b/dhcpv6/option_iapd.go
@@ -0,0 +1,61 @@
+package dhcpv6
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/u-root/u-root/pkg/uio"
+)
+
+// OptIAPD implements the identity association for prefix
+// delegation option defined by RFC 3633, Section 9.
+type OptIAPD struct {
+	IaId    [4]byte
+	T1      time.Duration
+	T2      time.Duration
+	Options Options
+}
+
+// Code returns the option code
+func (op *OptIAPD) Code() OptionCode {
+	return OptionIAPD
+}
+
+// ToBytes serializes the option and returns it as a sequence of bytes
+func (op *OptIAPD) ToBytes() []byte {
+	buf := uio.NewBigEndianBuffer(nil)
+	buf.WriteBytes(op.IaId[:])
+
+	t1 := Duration{op.T1}
+	t1.Marshal(buf)
+	t2 := Duration{op.T2}
+	t2.Marshal(buf)
+
+	buf.WriteBytes(op.Options.ToBytes())
+	return buf.Data()
+}
+
+// String returns a string representation of the OptIAPD data
+func (op *OptIAPD) String() string {
+	return fmt.Sprintf("OptIAPD{IAID=%v, t1=%v, t2=%v, options=%v}",
+		op.IaId, op.T1, op.T2, op.Options)
+}
+
+// ParseOptIAPD builds an OptIAPD structure from a sequence of bytes.
+// The input data does not include option code and length bytes.
+func ParseOptIAPD(data []byte) (*OptIAPD, error) {
+	var opt OptIAPD
+	buf := uio.NewBigEndianBuffer(data)
+	buf.ReadBytes(opt.IaId[:])
+
+	var t1, t2 Duration
+	t1.Unmarshal(buf)
+	t2.Unmarshal(buf)
+	opt.T1 = t1.Duration
+	opt.T2 = t2.Duration
+
+	if err := opt.Options.FromBytes(buf.ReadAll()); err != nil {
+		return nil, err
+	}
+	return &opt, buf.FinError()
+}