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diff --git a/src/vnet/dhcp/dhcp6_packet.h b/src/vnet/dhcp/dhcp6_packet.h
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+#ifndef included_vnet_dhcp6_packet_h
+#define included_vnet_dhcp6_packet_h
+
+/*
+ * DHCP packet format
+ *
+ * Copyright (c) 2013 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include <vnet/ip/ip6_packet.h>
+
+// #define DHCP_VRF_NAME_MAX_LEN L3VM_MAX_NAME_STR_LEN
+// #define DHCPV6_MAX_VRF_NAME_LEN L3VM_MAX_NAME_STR_LEN
+#define DHCP_MAX_RELAY_ADDR 16
+#define PROTO_UDP 17
+#define DHCPV6_CLIENT_PORT 546
+#define DHCPV6_SERVER_PORT 547
+#define HOP_COUNT_LIMIT 32
+#define DHCPV6_CISCO_ENT_NUM 9
+
+/*
+ * DHCPv6 message types
+ */
+typedef enum dhcpv6_msg_type_{
+ DHCPV6_MSG_SOLICIT = 1,
+ DHCPV6_MSG_ADVERTISE = 2,
+ DHCPV6_MSG_REQUEST = 3,
+ DHCPV6_MSG_CONFIRM = 4,
+ DHCPV6_MSG_RENEW = 5,
+ DHCPV6_MSG_REBIND = 6,
+ DHCPV6_MSG_REPLY = 7,
+ DHCPV6_MSG_RELEASE = 8,
+ DHCPV6_MSG_DECLINE = 9,
+ DHCPV6_MSG_RECONFIGURE = 10,
+ DHCPV6_MSG_INFORMATION_REQUEST = 11,
+ DHCPV6_MSG_RELAY_FORW = 12,
+ DHCPV6_MSG_RELAY_REPL = 13,
+} dhcpv6_msg_type_t;
+
+/*
+ * DHCPv6 options types
+ */
+enum {
+ DHCPV6_OPTION_CLIENTID = 1,
+ DHCPV6_OPTION_SERVERID = 2,
+ DHCPV6_OPTION_IA_NA = 3,
+ DHCPV6_OPTION_IA_TA = 4,
+ DHCPV6_OPTION_IAADDR = 5,
+ DHCPV6_OPTION_ORO = 6,
+ DHCPV6_OPTION_PREFERENCE = 7,
+ DHCPV6_OPTION_ELAPSED_TIME = 8,
+ DHCPV6_OPTION_RELAY_MSG = 9,
+ DHCPV6_OPTION_AUTH = 11,
+ DHCPV6_OPTION_UNICAST = 12,
+ DHCPV6_OPTION_STATUS_CODE = 13,
+ DHCPV6_OPTION_RAPID_COMMIT = 14,
+ DHCPV6_OPTION_USER_CLASS = 15,
+ DHCPV6_OPTION_VENDOR_CLASS = 16,
+ DHCPV6_OPTION_VENDOR_OPTS = 17,
+ DHCPV6_OPTION_INTERFACE_ID = 18, // relay agent fills this
+ DHCPV6_OPTION_RECONF_MSG = 19,
+ DHCPV6_OPTION_RECONF_ACCEPT = 20,
+ DHCPV6_OPTION_REMOTEID = 37, // relay agent fills this
+ DHCPV6_OPTION_VSS = 68, // relay agent fills this
+ DHCPV6_OPTION_CLIENT_LINK_LAYER_ADDRESS = 79,
+ DHCPV6_OPTION_MAX
+};
+
+/*
+* DHCPv6 status codes
+ */
+enum {
+ DHCPV6_STATUS_SUCCESS = 0,
+ DHCPV6_STATUS_UNSPEC_FAIL = 1,
+ DHCPV6_STATUS_NOADDRS_AVAIL = 2,
+ DHCPV6_STATUS_NO_BINDING = 3,
+ DHCPV6_STATUS_NOT_ONLINK = 4,
+ DHCPV6_STATUS_USE_MULTICAST = 5,
+};
+
+/*
+ * DHCPv6 DUID types
+ */
+enum {
+ DHCPV6_DUID_LLT = 1, /* DUID Based on Link-layer Address Plus Time */
+ DHCPV6_DUID_EN = 2, /* DUID Based on Enterprise Number */
+ DHCPV6_DUID_LL = 3, /* DUID Based on Link-layer Address */
+};
+
+//Structure for DHCPv6 payload from client
+typedef struct dhcpv6_hdr_ {
+ union {
+ u8 msg_type; //DHCP msg type
+ u32 xid; // transaction id
+ }u;
+ u8 data[0];
+} dhcpv6_header_t;
+
+
+
+typedef CLIB_PACKED (struct dhcpv6_relay_ctx_ {
+ dhcpv6_header_t *pkt;
+ u32 pkt_len;
+ u32 dhcpv6_len; //DHCPv6 payload load
+// if_ordinal iod;
+ u32 if_index;
+ u32 ctx_id;
+ char ctx_name[32+1];
+ u8 dhcp_msg_type;
+}) dhcpv6_relay_ctx_t;
+
+//Structure for DHCPv6 RELAY-FORWARD and DHCPv6 RELAY-REPLY pkts
+typedef CLIB_PACKED (struct dhcpv6_relay_hdr_ {
+ u8 msg_type;
+ u8 hop_count;
+ ip6_address_t link_addr;
+ ip6_address_t peer_addr;
+ u8 data[0];
+}) dhcpv6_relay_hdr_t;
+
+typedef enum dhcp_stats_action_type_ {
+ DHCP_STATS_ACTION_FORWARDED=1,
+ DHCP_STATS_ACTION_RECEIVED,
+ DHCP_STATS_ACTION_DROPPED
+} dhcp_stats_action_type_t;
+//Generic counters for a packet
+typedef struct dhcp_stats_counters_ {
+ u64 rx_pkts; //counter for received pkts
+ u64 tx_pkts; //counter for forwarded pkts
+ u64 drops; //counter for dropped pkts
+} dhcp_stats_counters_t;
+
+
+typedef enum dhcpv6_stats_drop_reason_ {
+ DHCPV6_RELAY_PKT_DROP_RELAYDISABLE = 1,
+ DHCPV6_RELAY_PKT_DROP_MAX_HOPS,
+ DHCPV6_RELAY_PKT_DROP_VALIDATION_FAIL,
+ DHCPV6_RELAY_PKT_DROP_UNKNOWN_OP_INTF,
+ DHCPV6_RELAY_PKT_DROP_BAD_CONTEXT,
+ DHCPV6_RELAY_PKT_DROP_OPT_INSERT_FAIL,
+ DHCPV6_RELAY_PKT_DROP_REPLY_FROM_CLIENT,
+} dhcpv6_stats_drop_reason_t;
+
+typedef CLIB_PACKED (struct {
+ u16 option;
+ u16 length;
+ u8 data[0];
+}) dhcpv6_option_t;
+
+typedef CLIB_PACKED (struct {
+ dhcpv6_option_t opt;
+ u32 int_idx;
+}) dhcpv6_int_id_t;
+
+typedef CLIB_PACKED (struct {
+ dhcpv6_option_t opt;
+ u8 data[8]; // data[0]:type, data[1..7]: VPN ID
+}) dhcpv6_vss_t;
+
+typedef CLIB_PACKED (struct {
+ dhcpv6_option_t opt;
+ u32 ent_num;
+ u32 rmt_id;
+}) dhcpv6_rmt_id_t;
+
+typedef CLIB_PACKED (struct {
+ dhcpv6_option_t opt;
+ u16 link_type;
+ u8 data[6]; // data[0]:data[5]: MAC address
+}) dhcpv6_client_mac_t;
+
+
+#endif /* included_vnet_dhcp6_packet_h */