#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;

/* Name, code, min payload length */
#define dhcpv6_foreach_option \
  _(CLIENTID         , 1  , 4 ) \
  _(SERVERID         , 2  , 4 ) \
  _(IA_NA            , 3  , 12) \
  _(IA_TA            , 4  , 4 ) \
  _(IAADDR           , 5  , 24) \
  _(ORO              , 6  , 0 ) \
  _(PREFERENCE       , 7  , 1 ) \
  _(ELAPSED_TIME     , 8  , 2 ) \
  _(RELAY_MSG        , 9  , 0 ) \
  _(AUTH             , 11 , 11) \
  _(UNICAST          , 12 , 16) \
  _(STATUS_CODE      , 13 , 2 ) \
  _(RAPID_COMMIT     , 14 , 0 ) \
  _(USER_CLASS       , 15 , 0 ) \
  _(VENDOR_CLASS     , 16 , 4 ) \
  _(VENDOR_OPTS      , 17 , 4 ) \
  _(INTERFACE_ID     , 18 , 0 ) \
  _(RECONF_MSG       , 19 , 1 ) \
  _(RECONF_ACCEPT    , 20 , 0 ) \
  _(DNS_SEARCH       , 24 , 0 ) \
  _(IA_PD            , 25 , 12) \
  _(IAPREFIX         , 26 , 25) \
  _(REMOTEID         , 37 , 4 ) \
  _(VSS              , 68 , 1 ) \
  _(CLIENT_LINK_LAYER_ADDRESS, 79 , 2 )

/*
 * DHCPv6 options types
 */
enum
{
#define _(a,b,c) DHCPV6_OPTION_##a = b,
  dhcpv6_foreach_option
#undef _
  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_STATUS_NOPREFIX_AVAIL = 6,
};

/*
 * 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_
{
  u8 msg_type;			//DHCP msg type
  u8 xid[3];			//Transaction id
  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;

#define dhcpv6_optlen(opt) clib_net_to_host_u16((opt)->length)

typedef CLIB_PACKED (struct {
  u16 option;
  u16 length;
  u8 data[0];
}) dhcpv6_option_t;

typedef CLIB_PACKED (struct {
  dhcpv6_option_t opt;
  u16 status_code;
}) dhcpv6_status_code_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 vss_type;
  u8 data[0];
}) 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;

typedef CLIB_PACKED (struct
		     {
		     dhcpv6_option_t opt; u32 iaid; u32 t1;
		     u32 t2;
		     u8 data[0];
		     }) dhcpv6_ia_header_t;

typedef CLIB_PACKED (struct
		     {
		     dhcpv6_option_t opt; u32 preferred; u32 valid; u8 prefix;
		     ip6_address_t addr;
		     }) dhcpv6_ia_opt_pd_t;

typedef CLIB_PACKED (struct
		     {
		     dhcpv6_option_t opt; ip6_address_t addr; u32 preferred;
		     u32 valid;
		     }) dhcpv6_ia_opt_addr_t;

typedef CLIB_PACKED (struct
		     {
		     dhcpv6_option_t opt;
		     u16 options[0];
		     }) dhcpv6_oro_t;

typedef CLIB_PACKED (struct
		     {
		     dhcpv6_option_t opt; u16 elapsed_10ms;
		     }) dhcpv6_elapsed_t;

typedef CLIB_PACKED (struct
		     {
		     dhcpv6_option_t opt; u16 duid_type;
		     u16 hardware_type;
		     }) dhcpv6_duid_t;

typedef CLIB_PACKED (struct
		     {
		     dhcpv6_option_t opt; u16 status_code;
		     u8 message[0];
		     }) dhcpv6_status_t;


#endif /* included_vnet_dhcp6_packet_h */

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */