1 files changed, 98 insertions, 0 deletions
diff --git a/dhcpv6/option_iaprefix.go b/dhcpv6/option_iaprefix.go
new file mode 100644
index 0000000..b4adacb
--- /dev/null
+++ b/dhcpv6/option_iaprefix.go
@@ -0,0 +1,98 @@
+package dhcpv6
+
+// This module defines the OptIAPrefix structure.
+// https://www.ietf.org/rfc/rfc3633.txt
+
+import (
+	"encoding/binary"
+	"fmt"
+	"net"
+)
+
+type OptIAPrefix struct {
+	preferredLifetime uint32
+	validLifetime     uint32
+	prefixLength      byte
+	ipv6Prefix        [16]byte
+	options           []byte
+}
+
+func (op *OptIAPrefix) Code() OptionCode {
+	return OPTION_IAPREFIX
+}
+
+func (op *OptIAPrefix) ToBytes() []byte {
+	buf := make([]byte, 25)
+	binary.BigEndian.PutUint16(buf[0:2], uint16(OPTION_IAPREFIX))
+	binary.BigEndian.PutUint16(buf[2:4], uint16(op.Length()))
+	binary.BigEndian.PutUint32(buf[4:8], op.preferredLifetime)
+	binary.BigEndian.PutUint32(buf[8:12], op.validLifetime)
+	buf = append(buf, op.prefixLength)
+	buf = append(buf, op.ipv6Prefix[:]...)
+	buf = append(buf, op.options...)
+	return buf
+}
+
+func (op *OptIAPrefix) PreferredLifetime() uint32 {
+	return op.preferredLifetime
+}
+
+func (op *OptIAPrefix) SetPreferredLifetime(pl uint32) {
+	op.preferredLifetime = pl
+}
+
+func (op *OptIAPrefix) ValidLifetime() uint32 {
+	return op.validLifetime
+}
+
+func (op *OptIAPrefix) SetValidLifetime(vl uint32) {
+	op.validLifetime = vl
+}
+
+func (op *OptIAPrefix) PrefixLength() byte {
+	return op.prefixLength
+}
+
+func (op *OptIAPrefix) SetPrefixLength(pl byte) {
+	op.prefixLength = pl
+}
+
+func (op *OptIAPrefix) IPv6Prefix() []byte {
+	return op.ipv6Prefix[:]
+}
+
+func (op *OptIAPrefix) SetIPv6Prefix(p [16]byte) {
+	op.ipv6Prefix = p
+}
+
+func (op *OptIAPrefix) Options() []byte {
+	return op.options
+}
+
+func (op *OptIAPrefix) SetOptions(options []byte) {
+	op.options = options
+}
+
+func (op *OptIAPrefix) Length() int {
+	return 25 + len(op.options)
+}
+
+func (op *OptIAPrefix) String() string {
+	return fmt.Sprintf("OptIAPrefix{preferredlifetime=%v, validlifetime=%v, prefixlength=%v, ipv6prefix=%v, options=%v}",
+		op.preferredLifetime, op.validLifetime, op.prefixLength, net.IP(op.ipv6Prefix[:]), op.options)
+}
+
+// build an OptIAPrefix structure from a sequence of bytes.
+// The input data does not include option code and length bytes.
+func ParseOptIAPrefix(data []byte) (*OptIAPrefix, error) {
+	opt := OptIAPrefix{}
+	if len(data) < 12 {
+		return nil, fmt.Errorf("Invalid IA for Prefix Delegation data length. Expected at least 12 bytes, got %v", len(data))
+	}
+	opt.preferredLifetime = binary.BigEndian.Uint32(data[:4])
+	opt.validLifetime = binary.BigEndian.Uint32(data[4:8])
+	opt.prefixLength = data[9]
+	copy(opt.ipv6Prefix[:], data[9:17])
+	copy(opt.options, data[17:])
+	return &opt, nil
+}