/* packet-dhcpv6.c
 * Routines for DHCPv6 packet disassembly
 * Copyright 2004, Nicolas DICHTEL - 6WIND - <nicolas.dichtel@6wind.com>
 * Jun-ichiro itojun Hagino <itojun@iijlab.net>
 * IItom Tsutomu MIENO <iitom@utouto.com>
 * SHIRASAKI Yasuhiro <yasuhiro@gnome.gr.jp>
 * Tony Lindstrom <tony.lindstrom@ericsson.com>
 * Copyright 2012, Jerome LAFORGE <jerome.laforge@gmail.com>
 *
 * The information used comes from:
 * RFC3315.txt (DHCPv6)
 * RFC3319.txt (SIP options)
 * RFC3633.txt (Prefix options)
 * RFC3646.txt (DNS servers/domains)
 * RFC3898.txt (NIS options)
 * RFC4075.txt (Simple Network Time Protocol Option); Deprecated as of RFC 5908
 * RFC4242.txt (Information Refresh Time Option)
 * RFC4280.txt (Broadcast and Multicast Control Servers Options)
 * RFC4649.txt (Remote ID option)
 * RFC4704.txt (Client FQDN)
 * RFC5007.txt (DHCPv6 Leasequery)
 * RFC5417.txt (CAPWAP Access Controller DHCP Option)
 * RFC5460.txt (DHCPv6 Bulk Leasequery)
 * RFC5908.txt (Network Time Protocol (NTP) Server Option)
 * RFC6334.txt (Dual-Stack Lite Option)
 * RFC6603.txt (Prefix Exclude Option)
 * RFC7598.txt (Configuration of Softwire Address and Port-Mapped Clients)
 * draft-ietf-dhc-dhcpv6-opt-timeconfig-03.txt
 * draft-ietf-dhc-dhcpv6-opt-lifetime-00.txt
 * draft-ietf-opsawg-mud-02.txt (Manufacturer Usage Descriptions + IANA assignment)
 * CL-SP-CANN-DHCP-Reg-I10-130808.pdf
 *
 * Note that protocol constants are still subject to change, based on IANA
 * assignment decisions.
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 */

#include "config.h"

#include <epan/packet.h>
#include <epan/addr_resolv.h>
#include <epan/expert.h>
#include <epan/prefs.h>
#include <epan/to_str.h>
#include <epan/arptypes.h>
#include <wsutil/str_util.h>
#include "packet-tcp.h"
#include "packet-arp.h"

void proto_register_dhcpv6(void);
void proto_reg_handoff_dhcpv6(void);

static gboolean dhcpv6_bulk_leasequery_desegment  = TRUE;
static gboolean cablelabs_interface_id = FALSE;

static int proto_dhcpv6 = -1;
static int proto_dhcpv6_bulk_leasequery = -1;
static int hf_dhcpv6_msgtype = -1;
static int hf_clientfqdn_reserved = -1;
static int hf_clientfqdn_n = -1;
static int hf_clientfqdn_o = -1;
static int hf_clientfqdn_s = -1;
static int hf_option_type = -1;
static int hf_option_length = -1;
static int hf_option_value = -1;
static int hf_remoteid_enterprise = -1;
static int hf_vendoropts_enterprise = -1;
static int hf_duid_bytes = -1;
static int hf_duid_type = -1;
static int hf_duidllt_time = -1;
static int hf_duidllt_link_layer_addr = -1;
static int hf_duidllt_hwtype = -1;
static int hf_duidll_hwtype = -1;
static int hf_duiden_enterprise = -1;
static int hf_duiden_identifier = -1;
static int hf_duidll_link_layer_addr = -1;
static int hf_duiduuid_bytes = -1;
static int hf_iaid = -1;
static int hf_iaid_t1 = -1;
static int hf_iaid_t2 = -1;
static int hf_iata = -1;
static int hf_iaaddr_ip = -1;
static int hf_iaaddr_pref_lifetime = -1;
static int hf_iaaddr_valid_lifetime = -1;
static int hf_requested_option_code = -1;
static int hf_option_preference = -1;
static int hf_elapsed_time = -1;
static int hf_auth_protocol = -1;
static int hf_auth_algorithm = -1;
static int hf_auth_rdm = -1;
static int hf_auth_replay_detection = -1;
static int hf_auth_info = -1;
static int hf_auth_realm = -1;
static int hf_auth_key_id = -1;
static int hf_auth_md5_data = -1;
static int hf_opt_unicast = -1;
static int hf_opt_status_code = -1;
static int hf_opt_status_msg = -1;
static int hf_vendorclass_enterprise = -1;
static int hf_vendorclass_data = -1;
static int hf_vendoropts_enterprise_option_code = -1;
static int hf_vendoropts_enterprise_option_length = -1;
static int hf_vendoropts_enterprise_option_data = -1;
static int hf_interface_id = -1;
static int hf_reconf_msg = -1;
static int hf_sip_server_domain_search_fqdn = -1;
static int hf_sip_server_a = -1;
static int hf_dns_servers = -1;
static int hf_domain_search_list_fqdn = -1;
static int hf_nis_servers = -1;
static int hf_nisp_servers = -1;
static int hf_nis_fqdn = -1;
static int hf_nisp_fqdn = -1;
static int hf_sntp_servers = -1;
static int hf_opt_lifetime = -1;
static int hf_bcmcs_servers_fqdn = -1;
static int hf_bcmcs_servers_a = -1;
static int hf_remoteid_enterprise_id = -1;
static int hf_subscriber_id = -1;
static int hf_client_fqdn = -1;
static int hf_pana_agent = -1;
static int hf_opt_timezone = -1;
static int hf_opt_tzdb = -1;
static int hf_lq_query = -1;
static int hf_lq_query_link_address = -1;
static int hf_clt_time = -1;
static int hf_lq_relay_data_peer_addr = -1;
static int hf_lq_relay_data_msg = -1;
static int hf_lq_client_link = -1;
static int hf_capwap_ac_v6 = -1;
static int hf_aftr_name = -1;
static int hf_iaprefix_pref_lifetime = -1;
static int hf_iaprefix_valid_lifetime = -1;
static int hf_iaprefix_pref_len = -1;
static int hf_iaprefix_pref_addr = -1;
static int hf_mip6_ha = -1;
static int hf_mip6_hoa = -1;
static int hf_nai = -1;
static int hf_pd_exclude_pref_len = -1;
static int hf_pd_exclude_subnet_id = -1;
static int hf_option_captive_portal = -1;
static int hf_dhcpv6_hopcount = -1;
static int hf_dhcpv6_xid = -1;
static int hf_dhcpv6_peeraddr = -1;
static int hf_dhcpv6_linkaddr = -1;
static int hf_opt_mudurl = -1;
static int hf_option_ntpserver_type = -1;
static int hf_option_ntpserver_length = -1;
static int hf_option_ntpserver_addr = -1;
static int hf_option_ntpserver_mc_addr = -1;
static int hf_option_ntpserver_fqdn = -1;
static int hf_packetcable_ccc_suboption = -1;
static int hf_packetcable_ccc_pri_dhcp = -1;
static int hf_packetcable_ccc_sec_dhcp = -1;
static int hf_packetcable_cccV6_suboption = -1;
static int hf_packetcable_cccV6_pri_dss = -1;
static int hf_packetcable_cccV6_sec_dss = -1;
static int hf_packetcable_cccV6_prov_srv_type = -1;
static int hf_packetcable_cccV6_prov_srv_fqdn = -1;
static int hf_packetcable_cccV6_prov_srv_ipv6 = -1;
static int hf_packetcable_cccV6_as_krb_nominal_timeout = -1;
static int hf_packetcable_cccV6_as_krb_max_timeout = -1;
static int hf_packetcable_cccV6_as_krb_max_retry_count = -1;
static int hf_packetcable_cccV6_ap_krb_nominal_timeout = -1;
static int hf_packetcable_cccV6_ap_krb_max_timeout = -1;
static int hf_packetcable_cccV6_ap_krb_max_retry_count = -1;
static int hf_packetcable_cccV6_krb_realm = -1;
static int hf_packetcable_cccV6_tgt_flag = -1;
static int hf_packetcable_cccV6_tgt_flag_fetch = -1;
static int hf_packetcable_cccV6_prov_timer = -1;
static int hf_packetcable_cccV6_sec_tcm = -1;
static int hf_packetcable_cccV6_sec_tcm_provisioning_server = -1;
static int hf_packetcable_cccV6_sec_tcm_call_manager_server = -1;
static int hf_cablelabs_opts = -1;
static int hf_modem_capabilities_encoding_type = -1;
static int hf_eue_capabilities_encoding_type = -1;
static int hf_capabilities_encoding_length = -1;
static int hf_capabilities_encoding_bytes = -1;
static int hf_capabilities_encoding_number = -1;
static int hf_cablelabs_ipv6_server = -1;
static int hf_cablelabs_docsis_version_number = -1;
static int hf_cablelabs_interface_id = -1;
static int hf_cablelabs_interface_id_link_address = -1;
static int hf_option_s46_rule_flags = -1;
static int hf_option_s46_rule_reserved_flag = -1;
static int hf_option_s46_rule_fmr_flag = -1;
static int hf_option_s46_rule_ea_len = -1;
static int hf_option_s46_rule_ipv4_pref_len = -1;
static int hf_option_s46_rule_ipv4_prefix = -1;
static int hf_option_s46_rule_ipv6_pref_len = -1;
static int hf_option_s46_rule_ipv6_prefix = -1;
static int hf_option_s46_br_address = -1;
static int hf_option_s46_dmr_pref_len = -1;
static int hf_option_s46_dmr_prefix = -1;
static int hf_option_s46_v4v6bind_ipv4_address = -1;
static int hf_option_s46_v4v6bind_ipv6_pref_len = -1;
static int hf_option_s46_v4v6bind_ipv6_prefix = -1;
static int hf_option_s46_portparam_offset = -1;
static int hf_option_s46_portparam_psid_len = -1;
static int hf_option_s46_portparam_psid = -1;

static gint ett_dhcpv6 = -1;
static gint ett_dhcpv6_option = -1;
static gint ett_dhcpv6_option_vsoption = -1;
static gint ett_dhcpv6_vendor_option = -1;
static gint ett_dhcpv6_pkt_option = -1;
static gint ett_dhcpv6_netserver_option = -1;
static gint ett_dhcpv6_tlv5_type = -1;
static gint ett_dhcpv6_sip_server_domain_search_list_option = -1;
static gint ett_dhcpv6_dns_domain_search_list_option = -1;
static gint ett_dhcpv6_nis_domain_name_option = -1;
static gint ett_dhcpv6_nisp_domain_name_option = -1;
static gint ett_dhcpv6_bcmcs_servers_domain_search_list_option = -1;
static gint ett_dhcpv6_s46_rule_flags = -1;

static expert_field ei_dhcpv6_bogus_length = EI_INIT;
static expert_field ei_dhcpv6_malformed_option = EI_INIT;
static expert_field ei_dhcpv6_no_suboption_len = EI_INIT;
static expert_field ei_dhcpv6_invalid_time_value = EI_INIT;
static expert_field ei_dhcpv6_invalid_type = EI_INIT;
static expert_field ei_dhcpv6_malformed_dns = EI_INIT;
static expert_field ei_dhcpv6_error_hopcount = EI_INIT;


static int hf_dhcpv6_bulk_leasequery_size = -1;
static int hf_dhcpv6_bulk_leasequery_msgtype = -1;
static int hf_dhcpv6_bulk_leasequery_reserved = -1;
static int hf_dhcpv6_bulk_leasequery_trans_id = -1;

static gint ett_dhcpv6_bulk_leasequery = -1;
static gint ett_dhcpv6_bulk_leasequery_options = -1;

static expert_field ei_dhcpv6_bulk_leasequery_bad_query_type = EI_INIT;
static expert_field ei_dhcpv6_bulk_leasequery_bad_msg_type = EI_INIT;

static dissector_handle_t dhcpv6_handle;

#define TCP_PORT_DHCPV6_UPSTREAM        547
#define UDP_PORT_DHCPV6_RANGE      "546-547" /* Downstream + Upstream */

#define DHCPV6_LEASEDURATION_INFINITY   0xffffffff
#define HOP_COUNT_LIMIT                 32

#define SOLICIT                  1
#define ADVERTISE                2
#define REQUEST                  3
#define CONFIRM                  4
#define RENEW                    5
#define REBIND                   6
#define REPLY                    7
#define RELEASE                  8
#define DECLINE                  9
#define RECONFIGURE             10
#define INFORMATION_REQUEST     11
#define RELAY_FORW              12
#define RELAY_REPLY             13
#define LEASEQUERY              14
#define LEASEQUERY_REPLY        15
#define LEASEQUERY_DONE         16
#define LEASEQUERY_DATA         17
#define RECONFIGURE_REQUEST     18
#define RECONFIGURE_REPLY       19

#define OPTION_CLIENTID                1
#define OPTION_SERVERID                2
#define OPTION_IA_NA                   3
#define OPTION_IA_TA                   4
#define OPTION_IAADDR                  5
#define OPTION_ORO                     6
#define OPTION_PREFERENCE              7
#define OPTION_ELAPSED_TIME            8
#define OPTION_RELAY_MSG               9
/* #define      OPTION_SERVER_MSG        10 */
#define OPTION_AUTH                   11
#define OPTION_UNICAST                12
#define OPTION_STATUS_CODE            13
#define OPTION_RAPID_COMMIT           14
#define OPTION_USER_CLASS             15
#define OPTION_VENDOR_CLASS           16
#define OPTION_VENDOR_OPTS            17
#define OPTION_INTERFACE_ID           18
#define OPTION_RECONF_MSG             19
#define OPTION_RECONF_ACCEPT          20
#define OPTION_SIP_SERVER_D           21 /* RFC 3319 */
#define OPTION_SIP_SERVER_A           22 /* RFC 3319 */
#define OPTION_DNS_SERVERS            23 /* RFC 3646 */
#define OPTION_DOMAIN_LIST            24 /* RFC 3646 */
#define OPTION_IA_PD                  25 /* RFC 3633 */
#define OPTION_IAPREFIX               26 /* RFC 3633 */
#define OPTION_NIS_SERVERS            27 /* RFC 3898 */
#define OPTION_NISP_SERVERS           28 /* RFC 3898 */
#define OPTION_NIS_DOMAIN_NAME        29 /* RFC 3898 */
#define OPTION_NISP_DOMAIN_NAME       30 /* RFC 3898 */
#define OPTION_SNTP_SERVERS           31 /* RFC 4075 */
#define OPTION_LIFETIME               32 /* RFC 4242: OPTION_INFORMATION_REFRESH_TIME */
#define OPTION_BCMCS_SERVER_D         33 /* RFC 4280 */
#define OPTION_BCMCS_SERVER_A         34 /* RFC 4280 */
/* 35 - Unassigned */
#define OPTION_GEOCONF_CIVIC          36 /* RFC 4776 */
#define OPTION_REMOTE_ID              37 /* RFC 4649 */
#define OPTION_SUBSCRIBER_ID          38 /* RFC 4580 */
#define OPTION_CLIENT_FQDN            39 /* RFC 4704 */
#define OPTION_PANA_AGENT             40 /* RFC 5192 */
#define OPTION_TIME_ZONE              41 /* RFC 4833: OPTION_NEW_POSIX_TIMEZONE */
#define OPTION_TZDB                   42 /* RFC 4833: OPTION_NEW_TZDB_TIMEZONE */
#define OPTION_ERO                    43 /* RFC 4994 */
#define OPTION_LQ_QUERY               44 /* RFC 5007 */
#define OPTION_CLIENT_DATA            45 /* RFC 5007 */
#define OPTION_CLT_TIME               46 /* RFC 5007 */
#define OPTION_LQ_RELAY_DATA          47 /* RFC 5007 */
#define OPTION_LQ_CLIENT_LINK         48 /* RFC 5007 */
#define OPTION_MIP6_HNIDF             49 /* RFC 6610 */
#define OPTION_MIP6_VDINF             50 /* RFC 6610 */
#define OPTION_V6_LOST                51 /* RFC 5223 */
#define OPTION_CAPWAP_AC_V6           52 /* RFC 5417 */
#define OPTION_RELAYID                53 /* RFC 5460 */
#define OPTION_IPV6_ADDRESS_MOS       54 /* RFC 5678: OPTION-IPv6_Address-MoS */
#define OPTION_IPV6_FQDN_MOS          55 /* RFC 5678: OPTION-IPv6_FQDN-MoS */
#define OPTION_NTP_SERVER             56 /* RFC 5908 */
#define OPTION_V6_ACCESS_DOMAIN       57 /* RFC 5986 */
#define OPTION_SIP_UA_CS_LIST         58 /* RFC 6011 */
#define OPTION_BOOTFILE_URL           59 /* RFC 5970: OPT_BOOTFILE_URL */
#define OPTION_BOOTFILE_PARAM         60 /* RFC 5970: OPT_BOOTFILE_PARAM */
#define OPTION_CLIENT_ARCH_TYPE       61 /* RFC 5970 */
#define OPTION_NII                    62 /* RFC 5970 */
#define OPTION_GEOLOCATION            63 /* RFC 6225 */
#define OPTION_AFTR_NAME              64 /* RFC 6334 */
#define OPTION_ERP_LOCAL_DOMAIN_NAME  65 /* RFC 6440 */
#define OPTION_RSOO                   66 /* RFC 6422 */
#define OPTION_PD_EXCLUDE             67 /* RFC 6603 */
#define OPTION_VSS                    68 /* RFC 6607 */
#define OPTION_MIP6_IDINF             69 /* RFC 6610 */
#define OPTION_MIP6_UDINF             70 /* RFC 6610 */
#define OPTION_MIP6_HNP               71 /* RFC 6610 */
#define OPTION_MIP6_HAA               72 /* RFC 6610 */
#define OPTION_MIP6_HAF               73 /* RFC 6610 */
#define OPTION_RDNSS_SELECTION        74 /* RFC 6731 */
#define OPTION_KRB_PRINCIPAL_NAME     75 /* RFC 6784 */
#define OPTION_KRB_REALM_NAME         76 /* RFC 6784 */
#define OPTION_KRB_DEFAULT_REALM_NAME 77 /* RFC 6784 */
#define OPTION_KRB_KDC                78 /* RFC 6784 */
#define OPTION_CLIENT_LINKLAYER_ADDR  79 /* RFC 6939 */
#define OPTION_LINK_ADDRESS           80 /* RFC 6977 */
#define OPTION_RADIUS                 81 /* RFC 7037 */
#define OPTION_SOL_MAX_RT             82 /* RFC 7083 */
#define OPTION_INF_MAX_RT             83 /* RFC 7083 */
#define OPTION_ADDRSEL                84 /* RFC 7078 */
#define OPTION_ADDRSEL_TABLE          85 /* RFC 7078 */
#define OPTION_V6_PCP_SERVER          86 /* RFC 7291 */
#define OPTION_DHCPV4_MSG             87 /* RFC 7341 */
#define OPTION_DHCP4_O_DHCP6_SERVER   88 /* RFC 7341 */
#define OPTION_S46_RULE               89 /* RFC 7598 */
#define OPTION_S46_BR                 90 /* RFC 7598 */
#define OPTION_S46_DMR                91 /* RFC 7598 */
#define OPTION_S46_V4V6BIND           92 /* RFC 7598 */
#define OPTION_S46_PORTPARAMS         93 /* RFC 7598 */
#define OPTION_S46_CONT_MAPE          94 /* RFC 7598 */
#define OPTION_S46_CONT_MAPT          95 /* RFC 7598 */
#define OPTION_S46_CONT_LW            96 /* RFC 7598 */
#define OPTION_4RD                    97 /* RFC 7600 */
#define OPTION_4RD_MAP_RULE           98 /* RFC 7600 */
#define OPTION_4RD_NON_MAP_RULE       99 /* RFC 7600 */
#define OPTION_LQ_BASE_TIME          100 /* RFC 7653 */
#define OPTION_LQ_START_TIME         101 /* RFC 7653 */
#define OPTION_LQ_END_TIME           102 /* RFC 7653 */
#define OPTION_CAPTIVE_PORTAL        103 /* RFC 7710: DHCP Captive-Portal */
#define OPTION_MPL_PARAMETERS        104 /* RFC 7774 */
#define OPTION_ANI_ATT               105 /* RFC 7839 */
#define OPTION_ANI_NETWORK_NAME      106 /* RFC 7839 */
#define OPTION_ANI_AP_NAME           107 /* RFC 7839 */
#define OPTION_ANI_AP_BSSID          108 /* RFC 7839 */
#define OPTION_ANI_OPERATOR_ID       109 /* RFC 7839 */
#define OPTION_ANI_OPERATOR_REALM    110 /* RFC 7839 */
#define OPTION_MUDURL                112 /* MUDURL */
#define OPTION_IPv6_ADDRESS_ANDSF    143 /* RFC 6153 */

/* temporary value until defined by IETF */
#define OPTION_MIP6_HA               165
#define OPTION_MIP6_HOA              166
#define OPTION_NAI                   167

#define DUID_LLT                1
#define DUID_EN                 2
#define DUID_LL                 3
#define DUID_UUID               4

static const value_string msgtype_vals[] = {
    { SOLICIT,                       "Solicit" },
    { ADVERTISE,                     "Advertise" },
    { REQUEST,                       "Request" },
    { CONFIRM,                       "Confirm" },
    { RENEW,                         "Renew" },
    { REBIND,                        "Rebind" },
    { REPLY,                         "Reply" },
    { RELEASE,                       "Release" },
    { DECLINE,                       "Decline" },
    { RECONFIGURE,                   "Reconfigure" },
    { INFORMATION_REQUEST,           "Information-request" },
    { RELAY_FORW,                    "Relay-forw" },
    { RELAY_REPLY,                   "Relay-reply" },
    { LEASEQUERY,                    "Leasequery" },
    { LEASEQUERY_REPLY,              "Leasequery-reply" },
    { LEASEQUERY_DONE,               "Leasequery-done" },
    { LEASEQUERY_DATA,               "Leasequery-data" },
    { RECONFIGURE_REQUEST,           "Reconfigure-request" },
    { RECONFIGURE_REPLY,             "Reconfigure-reply" },
    { 0, NULL }
};
static value_string_ext msgtype_vals_ext = VALUE_STRING_EXT_INIT(msgtype_vals);

static const value_string opttype_vals[] = {
    { OPTION_CLIENTID,               "Client Identifier" },
    { OPTION_SERVERID,               "Server Identifier" },
    { OPTION_IA_NA,                  "Identity Association for Non-temporary Address" },
    { OPTION_IA_TA,                  "Identity Association for Temporary Address" },
    { OPTION_IAADDR,                 "IA Address" },
    { OPTION_ORO,                    "Option Request" },
    { OPTION_PREFERENCE,             "Preference" },
    { OPTION_ELAPSED_TIME,           "Elapsed time" },
    { OPTION_RELAY_MSG,              "Relay Message" },
/*  { OPTION_SERVER_MSG,             "Server message" }, */
    { OPTION_AUTH,                   "Authentication" },
    { OPTION_UNICAST,                "Server unicast" },
    { OPTION_STATUS_CODE,            "Status code" },
    { OPTION_RAPID_COMMIT,           "Rapid Commit" },
    { OPTION_USER_CLASS,             "User Class" },
    { OPTION_VENDOR_CLASS,           "Vendor Class" },
    { OPTION_VENDOR_OPTS,            "Vendor-specific Information" },
    { OPTION_INTERFACE_ID,           "Interface-Id" },
    { OPTION_RECONF_MSG,             "Reconfigure Message" },
    { OPTION_RECONF_ACCEPT,          "Reconfigure Accept" },
    { OPTION_SIP_SERVER_D,           "SIP Server Domain Name List" },
    { OPTION_SIP_SERVER_A,           "SIP Servers IPv6 Address List" },
    { OPTION_DNS_SERVERS,            "DNS recursive name server" },
    { OPTION_DOMAIN_LIST,            "Domain Search List" },
    { OPTION_IA_PD,                  "Identity Association for Prefix Delegation" },
    { OPTION_IAPREFIX,               "IA Prefix" },
    { OPTION_NIS_SERVERS,            "Network Information Server" },
    { OPTION_NISP_SERVERS,           "Network Information Server V2" },
    { OPTION_NIS_DOMAIN_NAME,        "Network Information Server Domain Name" },
    { OPTION_NISP_DOMAIN_NAME,       "Network Information Server V2 Domain Name" },
    { OPTION_SNTP_SERVERS,           "Simple Network Time Protocol Server" },
    { OPTION_LIFETIME,               "Lifetime" },
    { OPTION_BCMCS_SERVER_D,         "BCMCS Server Domain" },
    { OPTION_BCMCS_SERVER_A,         "BCMCS Servers IPv6 Address List" },
    { OPTION_GEOCONF_CIVIC,          "Geoconf Civic Address" },
    { OPTION_REMOTE_ID,              "Remote Identifier" },
    { OPTION_SUBSCRIBER_ID,          "Subscriber Identifier" },
    { OPTION_CLIENT_FQDN,            "Fully Qualified Domain Name" },
    { OPTION_PANA_AGENT,             "PANA Agents IPv6 Address List" },
    { OPTION_TIME_ZONE,              "Time Zone" },
    { OPTION_TZDB,                   "Time Zone Database" },
    { OPTION_ERO,                    "Echo Request Option" },
    { OPTION_LQ_QUERY,               "Leasequery Query" },
    { OPTION_CLIENT_DATA,            "Leasequery Client Data" },
    { OPTION_CLT_TIME,               "Client Last Transaction Time" },
    { OPTION_LQ_RELAY_DATA,          "Leasequery Relay Data" },
    { OPTION_LQ_CLIENT_LINK,         "Leasequery Client Link Address List" },
    { OPTION_MIP6_HNIDF,             "Home Network Identifier FQDN" },
    { OPTION_MIP6_VDINF,             "Visited Home Network Information" },
    { OPTION_V6_LOST,                "LoST Server" },
    { OPTION_CAPWAP_AC_V6,           "CAPWAP Access Controllers" },
    { OPTION_RELAYID,                "Relay-ID" },
    { OPTION_IPV6_ADDRESS_MOS,       "MoS IPv6 Address" },
    { OPTION_IPV6_FQDN_MOS,          "MoS Domain Name List" },
    { OPTION_NTP_SERVER,             "NTP Server" },
    { OPTION_V6_ACCESS_DOMAIN,       "Access Network Domain Name" },
    { OPTION_SIP_UA_CS_LIST,         "SIP User Agent Configuration Service Domains" },
    { OPTION_BOOTFILE_URL,           "Boot File URL" },
    { OPTION_BOOTFILE_PARAM,         "Boot File Parameters" },
    { OPTION_CLIENT_ARCH_TYPE,       "Client System Architecture Type" },
    { OPTION_NII,                    "Client Network Interface Identifier" },
    { OPTION_GEOLOCATION,            "Geolocation" },
    { OPTION_AFTR_NAME,              "Dual-Stack Lite AFTR Name" },
    { OPTION_ERP_LOCAL_DOMAIN_NAME,  "ERP Local Domain Name" },
    { OPTION_RSOO,                   "Relay-Supplied Options" },
    { OPTION_PD_EXCLUDE,             "Prefix Exclude" },
    { OPTION_VSS,                    "Virtual Subnet Selection" },
    { OPTION_MIP6_IDINF,             "Identified Home Network Information" },
    { OPTION_MIP6_UDINF,             "Unrestricted Home Network Information" },
    { OPTION_MIP6_HNP,               "Home Network Prefix" },
    { OPTION_MIP6_HAA,               "Home Agent Address" },
    { OPTION_MIP6_HAF,               "Home Agent FQDN" },
    { OPTION_RDNSS_SELECTION,        "RDNSS Selection" },
    { OPTION_KRB_PRINCIPAL_NAME,     "Kerberos Principal Name" },
    { OPTION_KRB_REALM_NAME,         "Kerberos Realm Name" },
    { OPTION_KRB_DEFAULT_REALM_NAME, "Kerberos Default Realm Name" },
    { OPTION_KRB_KDC,                "Kerberos KDC" },
    { OPTION_CLIENT_LINKLAYER_ADDR,  "Client Link-Layer Address" },
    { OPTION_LINK_ADDRESS,           "Link Address" },
    { OPTION_RADIUS,                 "RADIUS" },
    { OPTION_SOL_MAX_RT,             "SOL_MAX_RT" },
    { OPTION_INF_MAX_RT,             "INF_MAX_RT" },
    { OPTION_ADDRSEL,                "Address Selection" },
    { OPTION_ADDRSEL_TABLE,          "Address Selection table" },
    { OPTION_V6_PCP_SERVER,          "PCP Server" },
    { OPTION_DHCPV4_MSG,             "DHCPv4 Message" },
    { OPTION_DHCP4_O_DHCP6_SERVER,   "DHCP 4o6 Servers Address" },
    { OPTION_S46_RULE,               "S46 Rule" },
    { OPTION_S46_BR,                 "S46 BR" },
    { OPTION_S46_DMR,                "S46 DMR" },
    { OPTION_S46_V4V6BIND,           "S46 IPv4/IPv6 Address Binding" },
    { OPTION_S46_PORTPARAMS,         "S46 Port Parameters" },
    { OPTION_S46_CONT_MAPE,          "S46 MAP-E Container" },
    { OPTION_S46_CONT_MAPT,          "S46 MAP-T Container" },
    { OPTION_S46_CONT_LW,            "S46 Lightweight 4over6 Container" },
    { OPTION_4RD,                    "4rd Options" },
    { OPTION_4RD_MAP_RULE,           "4rd Mapping Rule" },
    { OPTION_4RD_NON_MAP_RULE,       "4rd Non-Mapping Rule" },
    { OPTION_LQ_BASE_TIME,           "LQ Server Base Time" },
    { OPTION_LQ_START_TIME,          "LQ Server Query Start Time" },
    { OPTION_LQ_END_TIME,            "LQ Server Query End Time" },
    { OPTION_CAPTIVE_PORTAL,         "Captive Portal" },
    { OPTION_MPL_PARAMETERS,         "MPL Parameter Configuration" },
    { OPTION_ANI_ATT,                "Access Technology Type" },
    { OPTION_ANI_NETWORK_NAME,       "Access Network Name" },
    { OPTION_ANI_AP_NAME,            "Access Point Name" },
    { OPTION_ANI_AP_BSSID,           "Access Point BSSID" },
    { OPTION_ANI_OPERATOR_ID,        "Access Network Operator ID" },
    { OPTION_ANI_OPERATOR_REALM,     "Access Network Operator Realm" },
    { OPTION_MUDURL,                 "Manufacturer Usage Description" },
    { OPTION_IPv6_ADDRESS_ANDSF,     "ANDSF IPv6 Address" },
    { OPTION_MIP6_HA,                "Mobile IPv6 Home Agent" },
    { OPTION_MIP6_HOA,               "Mobile IPv6 Home Address" },
    { OPTION_NAI,                    "Network Access Identifier" },
    { 0,        NULL }
};
static value_string_ext opttype_vals_ext = VALUE_STRING_EXT_INIT(opttype_vals);

static const value_string statuscode_vals[] =
{
    { 0, "Success" },
    { 1, "UnspecFail" },
    { 2, "NoAddrAvail" },
    { 3, "NoBinding" },
    { 4, "NotOnLink" },
    { 5, "UseMulticast" },
    { 6, "NoPrefixAvail" },
    { 7, "UnknownQueryType" },
    { 8, "MalformedQuery" },
    { 9, "NotConfigured" },
    {10, "NotAllowed" },
    {11, "QueryTerminated" },
    {12, "DataMissing" },           /* RFC 7653 */
    {13, "CatchUpComplete" },       /* RFC 7653 */
    {14, "NotSupported" },          /* RFC 7653 */
    {15, "TLSConnectionRefused" },  /* RFC 7653 */
    {0, NULL }
};
static value_string_ext statuscode_vals_ext = VALUE_STRING_EXT_INIT(statuscode_vals);

static const value_string duidtype_vals[] =
{
    { DUID_LLT,  "link-layer address plus time" },
    { DUID_EN,   "assigned by vendor based on Enterprise number" },
    { DUID_LL,   "link-layer address" },
    { DUID_UUID, "Universally Unique IDentifier (UUID)" },
    { 0, NULL }
};

#define NTP_SUBOPTION_SRV_ADDR  1
#define NTP_SUBOPTION_MC_ADDR   2
#define NTP_SUBOPTION_SRV_FQDN  3

static const value_string ntp_server_opttype_vals[] =
{
    { NTP_SUBOPTION_SRV_ADDR,    "NTP Server Address" },
    { NTP_SUBOPTION_MC_ADDR,     "NTP Multicast Address" },
    { NTP_SUBOPTION_SRV_FQDN,    "NTP Server FQDN" },

    { 0, NULL }
};


static const true_false_string fqdn_n = {
    "Server should not perform DNS updates",
    "Server should perform DNS updates"
};

static const true_false_string fqdn_o = {
    "Server has overridden client's S bit preference",
    "Server has not overridden client's S bit preference"
};

static const true_false_string fqdn_s = {
    "Server should perform forward DNS updates",
    "Server should not perform forward DNS updates"
};

#define LQ_QUERY_ADDRESS        1
#define LQ_QUERY_CLIENTID       2
#define LQ_QUERY_RELAYID        3
#define LQ_QUERY_LINK_ADDRESS   4
#define LQ_QUERY_REMOTEID       5

static const value_string lq_query_vals[] = {
    { LQ_QUERY_ADDRESS,      "by-address" },
    { LQ_QUERY_CLIENTID,     "by-clientID" },
    { LQ_QUERY_RELAYID,      "by-relayID" },
    { LQ_QUERY_LINK_ADDRESS, "by-linkAddress" },
    { LQ_QUERY_REMOTEID,     "by-remoteID" },
    { 0, NULL },
};

/* CableLabs Common Vendor Specific Options */
#define CL_OPTION_ORO                     0x0001 /* 1 */
#define CL_OPTION_DEVICE_TYPE             0x0002 /* 2 */
#define CL_OPTION_EMBEDDED_COMPONENT_LIST 0x0003 /* 3 */
#define CL_OPTION_DEVICE_SERIAL_NUMBER    0x0004 /* 4 */
#define CL_OPTION_HARDWARE_VERSION_NUMBER 0x0005 /* 5 */
#define CL_OPTION_SOFTWARE_VERSION_NUMBER 0x0006 /* 6 */
#define CL_OPTION_BOOT_ROM_VERSION        0x0007 /* 7 */
#define CL_OPTION_VENDOR_OUI              0x0008 /* 8 */
#define CL_OPTION_MODEL_NUMBER            0x0009 /* 9 */
#define CL_OPTION_VENDOR_NAME             0x000a /* 10 */
/* 11-32 are currently reserved */
#define CL_OPTION_TFTP_SERVERS            0x0020 /* 32 */
#define CL_OPTION_CONFIG_FILE_NAME        0x0021 /* 33 */
#define CL_OPTION_SYSLOG_SERVERS          0x0022 /* 34 */
#define CL_OPTION_TLV5                    0x0023 /* 35 */
#define CL_OPTION_DEVICE_ID               0x0024 /* 36 */
#define CL_OPTION_RFC868_SERVERS          0x0025 /* 37 */
#define CL_OPTION_TIME_OFFSET             0x0026 /* 38 */
#define CL_OPTION_IP_PREF                 0x0027 /* 39 */
#define CL_OPTION_CCAP_CORES              0x003D /* 61 */

/** CableLabs DOCSIS Project Vendor Specific Options */
#define CL_OPTION_DOCS_CMTS_CAP 0x0401  /* 1025 */
#define CL_CM_MAC_ADDR 0x0402 /* 1026 */
#define CL_EROUTER_CONTAINER_OPTION 0x403 /* 1027 */

/** CableLabs PacketCable Project Vendor Specific Options **/
#define CL_OPTION_CCC            0x087a  /* 2170 */
#define CL_OPTION_CCCV6          0x087b  /* 2171 */
#define CL_OPTION_CORRELATION_ID 0x087c  /* 2172 */

/** CableLabs TLVs for DOCS_CMTS_CAP Vendor Option **/
#define CL_OPTION_DOCS_CMTS_TLV_VERS_NUM 0x01 /* 1 */

static const value_string cl_vendor_subopt_values[] = {
    /*    1 */ { CL_OPTION_ORO,                     "Option Request = " },
    /*    2 */ { CL_OPTION_DEVICE_TYPE,             "Device Type = " },
    /*    3 */ { CL_OPTION_EMBEDDED_COMPONENT_LIST, "Embedded Components = " },
    /*    4 */ { CL_OPTION_DEVICE_SERIAL_NUMBER,    "Serial Number = " },
    /*    5 */ { CL_OPTION_HARDWARE_VERSION_NUMBER, "Hardware Version = " },
    /*    6 */ { CL_OPTION_SOFTWARE_VERSION_NUMBER, "Software Version = " },
    /*    7 */ { CL_OPTION_BOOT_ROM_VERSION,        "Boot ROM Version = " },
    /*    8 */ { CL_OPTION_VENDOR_OUI,              "Organization Unique Identifier = " },
    /*    9 */ { CL_OPTION_MODEL_NUMBER,            "Model Number = " },
    /*   10 */ { CL_OPTION_VENDOR_NAME,             "Vendor Name = " },
    /*   32 */ { CL_OPTION_TFTP_SERVERS,            "TFTP Server Addresses : " },
    /*   33 */ { CL_OPTION_CONFIG_FILE_NAME,        "Configuration File Name = " },
    /*   34 */ { CL_OPTION_SYSLOG_SERVERS,          "Syslog Servers : " },
    /*   35 */ { CL_OPTION_TLV5,                    "TLV5 = " },
    /*   36 */ { CL_OPTION_DEVICE_ID,               "Device Identifier = " },
    /*   37 */ { CL_OPTION_RFC868_SERVERS,          "Time Protocol Servers : " },
    /*   38 */ { CL_OPTION_TIME_OFFSET,             "Time Offset = " },
    /*   39 */ { CL_OPTION_IP_PREF,                 "IP preference : " },
    /*   61 */ { CL_OPTION_CCAP_CORES,              "CCAP-CORES : " },
    /* 1025 */ { CL_OPTION_DOCS_CMTS_CAP,           "CMTS Capabilities Option : " },
    /* 1026 */ { CL_CM_MAC_ADDR,                    "CM MAC Address Option = " },
    /* 1027 */ { CL_EROUTER_CONTAINER_OPTION,       "eRouter Container Option : " },
    /* 2170 */ { CL_OPTION_CCC,                     "CableLabs Client Configuration : " },
    /* 2171 */ { CL_OPTION_CCCV6,                   "CableLabs Client Configuration IPv6 : " },
    /* 2172 */ { CL_OPTION_CORRELATION_ID,          "CableLabs Correlation ID = " },
    { 0, NULL }
};
static value_string_ext cl_vendor_subopt_values_ext = VALUE_STRING_EXT_INIT(cl_vendor_subopt_values);

/* 17:2170: CL_OPTION_CCC */
#define PKT_CCC_PRI_DHCP       0x0001
#define PKT_CCC_SEC_DHCP       0x0002

static const value_string pkt_ccc_opt_vals[] = {
    { PKT_CCC_PRI_DHCP,      "TSP's Primary DHCP Server" },
    { PKT_CCC_SEC_DHCP,      "TSP's Secondary DHCP Server" },
    { 0, NULL },
};

/* 17:2171: CL_OPTION_CCCV6 */
#define PKT_CCCV6_PRI_DSS       0x0001
#define PKT_CCCV6_SEC_DSS       0x0002
#define PKT_CCCV6_IETF_PROV_SRV 0x0003
#define PKT_CCCV6_IETF_AS_KRB   0x0004
#define PKT_CCCV6_IETF_AP_KRB   0x0005
#define PKT_CCCV6_KRB_REALM     0x0006
#define PKT_CCCV6_TGT_FLAG      0x0007
#define PKT_CCCV6_PROV_TIMER    0x0008
#define PKT_CCCV6_IETF_SEC_TKT  0x0009
/** 10 -255 Reserved for future extensions **/

static const value_string pkt_cccV6_opt_vals[] = {
    { PKT_CCCV6_PRI_DSS,        "TSP's Primary DHCPv6 Server Selector ID" },
    { PKT_CCCV6_SEC_DSS,        "TSP's Secondary DHCPv6 Server Selector ID " },
    { PKT_CCCV6_IETF_PROV_SRV,  "TSP's Provisioning Server" },
    { PKT_CCCV6_IETF_AS_KRB,    "TSP's AS-REQ/AS-REP Backoff and Retry" },
    { PKT_CCCV6_IETF_AP_KRB,    "TSP's AP-REQ/AP-REP Backoff and Retry" },
    { PKT_CCCV6_KRB_REALM,      "TSP's Kerberos Realm Name" },
    { PKT_CCCV6_TGT_FLAG,       "TSP's Ticket Granting Server Utilization" },
    { PKT_CCCV6_PROV_TIMER,     "TSP's Provisioning Timer Value" },
    { PKT_CCCV6_IETF_SEC_TKT,   "PacketCable Security Ticket Control" },
    { 0, NULL }
};
static value_string_ext pkt_cccV6_opt_vals_ext = VALUE_STRING_EXT_INIT(pkt_cccV6_opt_vals);

static const value_string pkt_cccV6_prov_srv_type_vals[] = {
    { 0,      "FQDN" },
    { 1,      "IPv6" },
    { 0, NULL },
};

#if 0
static const value_string sec_tcm_vals[] = {
    { 1 << 0, "PacketCable Provisioning Server" },
    { 1 << 1, "PacketCable Call Manager Servers" },
    { 0, NULL },
};
#endif

static const value_string modem_capabilities_encoding [] = {
    {  1,     "Concatenation Support" },
    {  2,     "DOCSIS Version" },
    {  3,     "Fragmentation Support" },
    {  4,     "Payload Header Suppression Support" },
    {  5,     "IGMP Support" },
    {  6,     "Privacy Support" },
    {  7,     "Downstream SAID Support" },
    {  8,     "Upstream Service Flow Support" },
    {  9,     "Optional Filtering Support" },
    { 10,      "Transmit Pre-Equalizer Taps per Modulation Interval" },
    { 11,      "Number of Transmit Equalizer Taps" },
    { 12,      "DCC Support" },
    { 13,      "IP Filters Support" },
    { 14,      "LLC Filters Support" },
    { 15,      "Expanded Unicast SID Space" },
    { 16,      "Ranging Hold-Off Support" },
    { 17,      "L2VPN Capability" },
    { 18,      "L2VPN eSAFE Host Capability" },
    { 19,      "Downstream Unencrypted Traffic (DUT) Filtering" },
    { 20,      "Upstream Frequency Range Support" },
    { 21,      "Upstream Symbol Rate Support" },
    { 22,      "Selectable Active Code Mode 2 Support" },
    { 23,      "Code Hopping Mode 2 Support" },
    { 24,      "Multiple Transmit Channel Support" },
    { 25,      "5.12 Msps UpstreamTransmit Channel Support" },
    { 26,      "2.56 Msps Upstream Transmit Channel Support" },
    { 27,      "Total SID Cluster Support" },
    { 28,      "SID Clusters per Service Flow Support" },
    { 29,      "Multiple Receive Channel Support" },
    { 30,      "Total Downstream Service ID (DSID) Support" },
    { 31,      "Resequencing Downstream Service ID (DSID) Support" },
    { 32,      "Multicast Downstream Service ID (DSID) Support" },
    { 33,      "Multicast DSID Forwarding" },
    { 34,      "Frame Control Type Forwarding Capability" },
    { 35,      "DPV Capability" },
    { 36,      "Unsolicited Grant Service/Upstream Service Flow Support" },
    { 37,      "MAP and UCD Receipt Support" },
    { 38,      "Upstream Drop Classifier Support" },
    { 39,      "IPv6 Support" },
    { 40,      "Extended Upstream Transmit Power Capability" },
    { 41,      "Optional 802.1ad, 802.1ah, MPLS Classification Support" },
    { 42,      "D-ONU Capabilities Encoding" },
    { 43,      "Reserved" },
    { 44,      "Energy Management Capabilities" },
/* Added TLV5.45-62 from CL-SP-CANN-I18-180509 */
    { 45,      "C-DOCSIS Capability Encoding" },
    { 46,      "CM-STATUS-ACK" },
    { 47,      "Energy Management Preferences" },
    { 48,      "Extended Packet Length Support Capability" },
    { 49,      "Multiple Receive OFDM Channel Support" },
    { 50,      "Multiple Transmit OFDMA Channel Support" },
    { 51,      "Downstream OFDM Profile Support" },
    { 52,      "Downstream OFDM channel subcarrier QAM modulation support" },
    { 53,      "Upstream OFDM channel subcarrier QAM modulation support" },
    { 54,      "Downstream Lower Band Edge Support" },
    { 55,      "Downstream Upper Band Edge Support" },
    { 56,      "Upstream Upper Band Edge Support" },
    { 57,      "DOCSIS Time Protocol Support" },
    { 58,      "DOCSIS Time Protocol Performance Support" },
    { 59,      "Pmax" },
    { 60,      "Diplexer Downstream Lower Band Edge" },
    { 61,      "Diplexer Downstream Upper Band Edge" },
    { 62,      "Diplexer Upstream Upper Band Edge" },
    { 0, NULL },
};
static value_string_ext modem_capabilities_encoding_ext = VALUE_STRING_EXT_INIT(modem_capabilities_encoding);

static const value_string eue_capabilities_encoding [] = {
    {  1,      "PacketCable Version" },
    {  2,      "Number Of Telephony Endpoints" },
    {  3,      "TGT Support" },
    {  4,      "HTTP Download File Access Method Support" },
    {  5,      "MTA-24 Event SYSLOG Notification Support" },
    {  6,      "NCS Service Flow Support" },
    {  7,      "Primary Line Support" },
    {  8,      "Vendor Specific TLV Type(s)" },
    {  9,      "NVRAM Ticket/Ticket Information Storage Support" },
    { 10,      "Provisioning Event Reporting Support" },
    { 11,      "Supported CODEC(s)" },
    { 12,      "Silence Suppression Support" },
    { 13,      "Echo Cancellation Support" },
    { 14,      "RSVP Support" },
    { 15,      "UGS-AD Support" },
    { 16,      "MTA's \"ifIndex\" starting number in \"ifTable\"" },
    { 17,      "Provisioning Flow Logging Support" },
    { 18,      "Supported Provisioning Flows" },
    { 19,      "T38 Version Support" },
    { 20,      "T38 Error Correction Support" },
    { 21,      "RFC2833 DTMF Support" },
    { 22,      "Voice Metrics Support" },
    { 23,      "Device MIB Support" },
    { 24,      "Multiple Grants Per Interval Support" },
    { 25,      "V.152 Support" },
    { 26,      "Certificate Bootstrapping Support" },
    { 38,      "IP Address Provisioning Capability" },
    { 0, NULL },
};
static value_string_ext eue_capabilities_encoding_ext = VALUE_STRING_EXT_INIT(eue_capabilities_encoding);

typedef struct hopcount_info_t {
    guint8     hopcount;
    proto_item *pi;
    gboolean   relay_message_previously_detected;
} hopcount_info;

static const int *dhcpv6_s46_rule_flags_fields[] = {
    &hf_option_s46_rule_reserved_flag,
    &hf_option_s46_rule_fmr_flag,
    NULL
};

static void
initialize_hopount_info(hopcount_info *hpi) {
  memset(hpi, 0, sizeof(hopcount_info));
}

static void
dissect_dhcpv6(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
               int off, int eoff, hopcount_info hpi);

static int
dissect_dhcpv6_s46_ipv6_prefix(tvbuff_t *tvb, int hf, int offset, int prefix_length, proto_tree *tree);

static int
dissect_packetcable_ccc_option(proto_tree *v_tree, proto_item *v_item, packet_info *pinfo, tvbuff_t *tvb, int optoff,
                               int optend)
{
    /** THE ENCODING OF THIS SUBOPTION HAS CHANGED FROM DHCPv4
        the code and length fields have grown from a single octet to
        two octets each. **/
    int         suboptoff = optoff;
    guint16     subopt, subopt_len;
    proto_item *vti;
    proto_tree *pkt_s_tree;

    subopt = tvb_get_ntohs(tvb, optoff);
    suboptoff += 2;

    subopt_len = tvb_get_ntohs(tvb, suboptoff);
    suboptoff += 2;

    /* There must be at least five octets left to be a valid sub element */
    if (optend <= 0) {
        expert_add_info_format(pinfo, v_item, &ei_dhcpv6_no_suboption_len, "Sub element %d: no room left in option for suboption length", subopt);
        return (suboptoff - optoff);
    }
    /* g_print("dissect packetcable ccc option subopt_len=%d optend=%d\n\n", subopt_len, optend); */

    vti = proto_tree_add_item(v_tree, hf_packetcable_ccc_suboption, tvb, optoff, 2, ENC_BIG_ENDIAN);
    pkt_s_tree = proto_item_add_subtree(vti, ett_dhcpv6_pkt_option);

    switch (subopt) {
    case PKT_CCC_PRI_DHCP:      /* IPv4 address values */
        if (subopt_len == 4) {
            proto_tree_add_item(pkt_s_tree, hf_packetcable_ccc_pri_dhcp, tvb, suboptoff, 4, ENC_BIG_ENDIAN);
        }
        else {
            expert_add_info_format(pinfo, vti, &ei_dhcpv6_bogus_length, "Bogus length: %d", subopt_len);
        }

        suboptoff += subopt_len;
        break;
    case PKT_CCC_SEC_DHCP:
        if (subopt_len == 4) {
            proto_tree_add_item(pkt_s_tree, hf_packetcable_ccc_sec_dhcp, tvb, suboptoff, 4, ENC_BIG_ENDIAN);
        }
        else {
            expert_add_info_format(pinfo, vti, &ei_dhcpv6_bogus_length, "Bogus length: %d", subopt_len);
        }

        suboptoff += subopt_len;
        break;
    default:
        suboptoff += subopt_len;
        break;

    }

    /** Return the number of bytes processed **/
    return (suboptoff - optoff);
}

/* Adds domain */

/* XXX: ToDo: Rework to use some version of (a revised) get_dns_name() for each individual FQDN */
static void
dhcpv6_domain(proto_tree *subtree, proto_item *v_item, packet_info *pinfo, int hfindex, tvbuff_t *tvb, int offset, guint16 optlen)
{
    int    start_offset = offset;
    char   domain[256];
    int    pos;
    guint8 len;

    pos = 0;
    while (optlen) {
        /* this is the start of the domain name */
        if (!pos) {
            start_offset = offset;
        }
        domain[pos] = '\0';

        /* read length of the next substring */
        len = tvb_get_guint8(tvb, offset);
        /* Microsoft dhcpv6 clients aren't currently RFC 4704 conformant: They send an
         * ASCII string instead of a DNS record encoded domain name. Catch that case
         * to allow us to continue after such a malformed record.
         */
        if (optlen < len) {
            expert_add_info(pinfo, v_item, &ei_dhcpv6_malformed_dns);
            return;
        }
        offset += 1;
        optlen -= 1;
        /* if len==0 and pos>0 we have read an entire domain string */
        if (!len) {
            if (!pos) {
                /* empty string, this must be an error? */
                expert_add_info(pinfo, v_item, &ei_dhcpv6_malformed_option);
                return;
            } else {
                proto_tree_add_string(subtree, hfindex, tvb, start_offset, offset-start_offset, domain);
                pos = 0;
                continue;
            }
        }

        /* add the substring to domain */
        if (pos) {
            domain[pos] = '.';
            pos++;
        }
        if ((pos + len) > 254) {
            /* too long string, this must be an error? */
            expert_add_info(pinfo, v_item, &ei_dhcpv6_malformed_option);
            return;
        }
        tvb_memcpy(tvb, domain+pos, offset, len);
        pos    += len;
        offset += len;
        optlen -= len;
    }

    if (pos) {
        domain[pos] = '\0';
        proto_tree_add_string(subtree, hfindex, tvb, start_offset, offset-start_offset, domain);
    }
}

static int
dissect_packetcable_cccV6_option(proto_tree *v_tree, proto_item *v_item, packet_info *pinfo, tvbuff_t *tvb, int optoff,
    int optend)
{
    int         suboptoff = optoff;
    guint16     subopt, subopt_len;
    guint8      type;
    proto_item *vti, *ti;
    proto_tree *pkt_s_tree;
    int         i;

    subopt = tvb_get_ntohs(tvb, optoff);
    suboptoff += 2;

    subopt_len = tvb_get_ntohs(tvb, suboptoff);
    suboptoff += 2;

    /* There must be at least five octets left to be a valid sub element */
    if (optend <= 0) {
        expert_add_info_format(pinfo, v_item, &ei_dhcpv6_no_suboption_len, "Sub element %d: no room left in option for suboption length", subopt);
        return (suboptoff - optoff);
    }

    vti = proto_tree_add_item(v_tree, hf_packetcable_cccV6_suboption, tvb, optoff, 2, ENC_BIG_ENDIAN);
    pkt_s_tree = proto_item_add_subtree(vti, ett_dhcpv6_pkt_option);

    switch (subopt) {
    case PKT_CCCV6_PRI_DSS:
        if (subopt_len < 35) {
            proto_tree_add_item(pkt_s_tree, hf_packetcable_cccV6_pri_dss, tvb, suboptoff, subopt_len, ENC_ASCII|ENC_NA);
        } else {
            expert_add_info_format(pinfo, vti, &ei_dhcpv6_bogus_length, "Bogus length: %d", subopt_len);
        }
        suboptoff += subopt_len;
        break;
    case PKT_CCCV6_SEC_DSS:
        if (subopt_len < 35) {
            proto_tree_add_item(pkt_s_tree, hf_packetcable_cccV6_sec_dss, tvb, suboptoff, subopt_len, ENC_ASCII|ENC_NA);
        } else {
            expert_add_info_format(pinfo, vti, &ei_dhcpv6_bogus_length, "Bogus length: %d", subopt_len);
        }
        suboptoff += subopt_len;
        break;
    case PKT_CCCV6_IETF_PROV_SRV:
        proto_tree_add_item(pkt_s_tree, hf_packetcable_cccV6_prov_srv_type, tvb, suboptoff, 1, ENC_BIG_ENDIAN);
        type = tvb_get_guint8(tvb, suboptoff);

        /** Type 0 is FQDN **/
        if (type == 0) {
            dhcpv6_domain(pkt_s_tree, vti, pinfo, hf_packetcable_cccV6_prov_srv_fqdn, tvb, suboptoff+1, subopt_len-1);

            /** Type 1 is IPv6 **/
        } else if (type == 1) {
            if ((subopt_len % 16) == 0) {
                for (i = 0; i < subopt_len/16; i++) {
                    proto_tree_add_item(pkt_s_tree, hf_packetcable_cccV6_prov_srv_ipv6, tvb, suboptoff+1, 4, ENC_NA);
                    suboptoff += 16;
                }
            }
        } else {
            expert_add_info_format(pinfo, vti, &ei_dhcpv6_invalid_type, "Invalid type: %u (%u byte%s)",
                                   type, subopt_len, plurality(subopt_len, "", "s"));
        }
        suboptoff += subopt_len;
        break;
    case PKT_CCCV6_IETF_AS_KRB:
        if (subopt_len == 12) {
            proto_tree_add_item(pkt_s_tree, hf_packetcable_cccV6_as_krb_nominal_timeout, tvb, suboptoff, 4, ENC_BIG_ENDIAN);
            proto_tree_add_item(pkt_s_tree, hf_packetcable_cccV6_as_krb_max_timeout, tvb, suboptoff+4, 4, ENC_BIG_ENDIAN);
            proto_tree_add_item(pkt_s_tree, hf_packetcable_cccV6_as_krb_max_retry_count, tvb, suboptoff+8, 4, ENC_BIG_ENDIAN);
        } else {
            proto_item_append_text(vti, "Bogus length: %d", subopt_len);
        }
        suboptoff += subopt_len;
        break;
    case PKT_CCCV6_IETF_AP_KRB:
        if (subopt_len == 12) {
            proto_tree_add_item(pkt_s_tree, hf_packetcable_cccV6_ap_krb_nominal_timeout, tvb, suboptoff, 4, ENC_BIG_ENDIAN);
            proto_tree_add_item(pkt_s_tree, hf_packetcable_cccV6_ap_krb_max_timeout, tvb, suboptoff+4, 4, ENC_BIG_ENDIAN);
            proto_tree_add_item(pkt_s_tree, hf_packetcable_cccV6_ap_krb_max_retry_count, tvb, suboptoff+8, 4, ENC_BIG_ENDIAN);
        } else {
            proto_item_append_text(vti, "Bogus length: %d", subopt_len);
        }
        suboptoff += subopt_len;
        break;
    case PKT_CCCV6_KRB_REALM:
        if (subopt_len > 0) {
            dhcpv6_domain(pkt_s_tree, vti, pinfo, hf_packetcable_cccV6_krb_realm, tvb, suboptoff, subopt_len);
        }
        suboptoff += subopt_len;
        break;
    case PKT_CCCV6_TGT_FLAG:
        if (subopt_len == 1) {
            proto_tree_add_item(pkt_s_tree, hf_packetcable_cccV6_tgt_flag, tvb, suboptoff, 1, ENC_BIG_ENDIAN);
            proto_tree_add_item(pkt_s_tree, hf_packetcable_cccV6_tgt_flag_fetch, tvb, suboptoff, 1, ENC_BIG_ENDIAN);
        }
        else {
            expert_add_info_format(pinfo, vti, &ei_dhcpv6_bogus_length, "Bogus length: %d", subopt_len);
        }
        suboptoff += subopt_len;
        break;
    case PKT_CCCV6_PROV_TIMER:
        if (subopt_len == 1) {
            ti = proto_tree_add_item(pkt_s_tree, hf_packetcable_cccV6_prov_timer, tvb, suboptoff, 1, ENC_BIG_ENDIAN);
            if (tvb_get_guint8(tvb, suboptoff) > 30)
                expert_add_info(pinfo, ti, &ei_dhcpv6_invalid_time_value);
        }
        else {
            expert_add_info_format(pinfo, vti, &ei_dhcpv6_bogus_length, "Bogus length: %d", subopt_len);
        }
        suboptoff += subopt_len;
        break;
    case PKT_CCCV6_IETF_SEC_TKT:
        proto_tree_add_item(pkt_s_tree, hf_packetcable_cccV6_sec_tcm, tvb, suboptoff, 2, ENC_BIG_ENDIAN);
        if (subopt_len == 2) {
            proto_tree_add_item(pkt_s_tree, hf_packetcable_cccV6_sec_tcm_provisioning_server, tvb, suboptoff, 2, ENC_BIG_ENDIAN);
            proto_tree_add_item(pkt_s_tree, hf_packetcable_cccV6_sec_tcm_call_manager_server, tvb, suboptoff, 2, ENC_BIG_ENDIAN);
        } else {
            expert_add_info_format(pinfo, vti, &ei_dhcpv6_bogus_length, "Bogus length: %d", subopt_len);
        }
        suboptoff += subopt_len;
        break;
    default:
        suboptoff += subopt_len;
        break;
    }
    /** Return the number of bytes processed **/
    return (suboptoff - optoff);
}

/* ToDo: review latest CL docs for updates */
static void
dissect_cablelabs_specific_opts(proto_tree *v_tree, proto_item *v_item, packet_info *pinfo, tvbuff_t *tvb, int voff, int len)
{
    guint type,
          sub_value;
    proto_item *ti;
    proto_item *ti2;
    proto_tree *subtree;
    proto_tree *subtree2;
    int tlv5_cap_index,
        tlv5_counter,
        tlv5_cap_len;
    int off = voff,
        sub_off, /** The offset for the sub-option */
        i,
        tlv_len, /* holds the number of elements in the tlv */
        field_len, /* holds the length of one occurrence of a field */
        opt_len, /* holds the length of the suboption */
        field_value;
    gchar *device_type = NULL;

    if (len > 4) {
        while (off - voff < len) {

            /* Type */
            type = tvb_get_ntohs(tvb, off);
            ti = proto_tree_add_item(v_tree, hf_cablelabs_opts, tvb, off, 2, ENC_BIG_ENDIAN);
            /* Length */
            tlv_len = tvb_get_ntohs(tvb, off+2);

            /* Values */
            sub_off = off + 4;

            switch (type) {
                /* String types */
            case CL_OPTION_DEVICE_TYPE:
                opt_len = tlv_len;
                field_len = tlv_len;

                device_type = tvb_get_string_enc(wmem_packet_scope(), tvb, sub_off, field_len, ENC_ASCII);

                if ((device_type == NULL) || (strlen(device_type) == 0)) {
                    proto_item_append_text(ti, "Packet does not contain Device Type.");
                } else {
                    proto_item_append_text(ti, "\"%s\"", device_type);
                }
                break;
            case CL_OPTION_DEVICE_SERIAL_NUMBER:
            case CL_OPTION_HARDWARE_VERSION_NUMBER:
            case CL_OPTION_SOFTWARE_VERSION_NUMBER:
            case CL_OPTION_BOOT_ROM_VERSION:
            case CL_OPTION_MODEL_NUMBER:
            case CL_OPTION_VENDOR_NAME:
            case CL_OPTION_CONFIG_FILE_NAME:
            case CL_OPTION_EMBEDDED_COMPONENT_LIST:
                opt_len = tlv_len;
                field_len = tlv_len;
                proto_item_append_text(ti, "\"%s\"",
                                       tvb_format_stringzpad(tvb, sub_off, field_len));
                break;
            case CL_OPTION_VENDOR_OUI:
                /* CableLabs specs treat 17.8 inconsistently
                 * as either binary (3b) or string (6b) */
                opt_len = tlv_len;
                if (tlv_len == 3) {
                    proto_item_append_text(ti, "%s",
                        tvb_bytes_to_str_punct(wmem_packet_scope(), tvb, sub_off, 3, ':'));
                } else if (tlv_len == 6) {
                    proto_item_append_text(ti, "\"%s\"", tvb_format_stringzpad(tvb, sub_off, tlv_len));
                } else {
                    expert_add_info_format(pinfo, ti, &ei_dhcpv6_bogus_length, "Suboption %d: suboption length isn't 3 or 6", type);
                }
                break;
            case CL_OPTION_ORO:
                field_len = 2;
                opt_len = tlv_len;
                if (opt_len > 0) {
                    for (i = 0; i < tlv_len; i += field_len) {
                        sub_value = tvb_get_ntohs(tvb, sub_off);
                        proto_item_append_text(ti, " %d", sub_value);
                        sub_off += field_len;
                    }
                }
                break;
            /* List of IPv6 Address */
            case CL_OPTION_TFTP_SERVERS:
            case CL_OPTION_SYSLOG_SERVERS:
            case CL_OPTION_RFC868_SERVERS:
            case CL_OPTION_CCAP_CORES:
                field_len = 16;
                opt_len = tlv_len;
                subtree = proto_item_add_subtree(ti, ett_dhcpv6_vendor_option);

                if ((tlv_len % field_len) == 0) {
                    for (i = 0; i < tlv_len/field_len; i++) {
                        ti = proto_tree_add_item(subtree, hf_cablelabs_ipv6_server, tvb, sub_off, 16, ENC_NA);
                        proto_item_prepend_text(ti, " %d ", i + 1);
                        sub_off += field_len;
                    }
                }
                break;
            case CL_OPTION_DEVICE_ID:
                opt_len = tlv_len;
                field_len = tlv_len;
                if (tlv_len != 6) {
                    expert_add_info_format(pinfo, ti, &ei_dhcpv6_bogus_length, "Bogus length: %d", tlv_len);
                }
                else {
                    proto_item_append_text(ti, "%s",
                                           tvb_bytes_to_str(wmem_packet_scope(), tvb, sub_off, field_len));
                }
                break;
            case CL_OPTION_TLV5:
                /* ToDo: review latest CL docs for updates */
                opt_len = tlv_len;


                tlv5_counter = 0;
                tlv5_cap_index = sub_off;

                subtree = proto_item_add_subtree(ti, ett_dhcpv6_tlv5_type);

                while (tlv5_counter < tlv_len) {
                    /*Device type is not mandatory for CM (see par 10.2.5.2.3 "Obtain IPv6 Management Address and Other Configuration Parameters" in  CM-SP-MULPIv3.1-114-180130*/
                    if (device_type == NULL || !g_ascii_strncasecmp(device_type, "ecm", 3)) {
                        ti2 = proto_tree_add_item(subtree, hf_modem_capabilities_encoding_type, tvb, tlv5_cap_index, 1, ENC_BIG_ENDIAN);
                    } else if (!g_ascii_strncasecmp(device_type, "edva", 3)) {
                        ti2 = proto_tree_add_item(subtree, hf_eue_capabilities_encoding_type, tvb, tlv5_cap_index, 1, ENC_BIG_ENDIAN);
                    } else {
                        break;
                    }

                    tlv5_cap_index++;
                    tlv5_counter++;

                    /* Why make another subtree (subtree2) below?
                       The addition of a subtree is not needed for the display.
                       However, when parsing the PDML, each Type 'contains' it's Length and Value.
                    */
                    subtree2 = proto_item_add_subtree(ti2, ett_dhcpv6_tlv5_type);

                    proto_tree_add_item(subtree2, hf_capabilities_encoding_length, tvb, tlv5_cap_index, 1, ENC_BIG_ENDIAN);
                    tlv5_cap_len = (guint8) tvb_get_guint8(tvb, tlv5_cap_index);

                    tlv5_cap_index++;
                    tlv5_counter += tlv5_cap_len;

                    /* In cases where the TLV length is greater than 2, the value fields should be displayed
                       according to the encoding of the values as described in the CL-SP-CANN-DHCP-Reg specification.
                       Below, these values are simply displayed as hex.
                    */
                    if (tlv5_cap_len > 2) {
                            proto_tree_add_item(subtree2, hf_capabilities_encoding_bytes, tvb, tlv5_cap_index, tlv5_cap_len, ENC_NA);
                    } else {
                            proto_tree_add_item(subtree2, hf_capabilities_encoding_number, tvb, tlv5_cap_index, tlv5_cap_len, ENC_BIG_ENDIAN);
                    }

                    tlv5_cap_index += tlv5_cap_len;
                    tlv5_counter++;
                }
                break;
            case CL_OPTION_TIME_OFFSET:
                opt_len = tlv_len;
                proto_item_append_text(ti, "%d", tvb_get_ntohl(tvb, sub_off));
                break;
            case CL_OPTION_IP_PREF:
                opt_len = tlv_len;
                field_value = tvb_get_guint8(tvb, sub_off);
                if (field_value == 1) {
                    proto_item_append_text(ti, "%s", "IPv4");
                } else if (field_value == 2) {
                    proto_item_append_text(ti, "%s", "IPv6");
                } else if (field_value == 6) {
                    proto_item_append_text(ti, "%s", "Dual Stack");
                } else {
                    proto_item_append_text(ti, "%s%d", "Invalid IP Preference value ", field_value);
                }
                break;
            case CL_OPTION_DOCS_CMTS_CAP:
                opt_len = tlv_len;
                field_len = 0;
                subtree = proto_item_add_subtree(ti, ett_dhcpv6_vendor_option);

                /* tlv_len contains the total length of all the TLVs for this
                   option */
                if (tlv_len > 0) {
                    for (i = 0; field_len < opt_len; i++) {
                        int tagLen = 0;
                        int tag = 0;
                        tag = tvb_get_guint8(tvb, sub_off);
                        sub_off++;
                        tagLen = tvb_get_guint8(tvb, sub_off);
                        sub_off++;
                        if ((tag == CL_OPTION_DOCS_CMTS_TLV_VERS_NUM) && (tagLen == 2)) {
                            proto_tree_add_item(subtree, hf_cablelabs_docsis_version_number, tvb, sub_off,
                                2, ENC_BIG_ENDIAN);
                            sub_off += 2;
                        }
                        else
                            sub_off += tagLen;

                        field_len += tagLen + 2;
                    }
                }
                else
                    proto_item_append_text(ti, " (empty)");
                break;
            case CL_CM_MAC_ADDR:
                opt_len = tlv_len;
                if (tlv_len != 6) {
                    expert_add_info_format(pinfo, ti, &ei_dhcpv6_bogus_length, "Bogus length: %d", tlv_len);
                }
                else {
                    /*proto_item_append_text(ti, "CM MAC Address Option = %s", */
                    proto_item_append_text(ti, "%s", tvb_bytes_to_str_punct(wmem_packet_scope(), tvb, sub_off, opt_len, ':'));
                    /* tvb_bytes_to_str(wmem_packet_scope(), tvb, sub_off, opt_len)); */
                }
                break;
            case CL_EROUTER_CONTAINER_OPTION:
                opt_len = tlv_len;
                proto_item_append_text(ti, " %s (len=%d)",
                                       tvb_bytes_to_str(wmem_packet_scope(), tvb, sub_off, opt_len), tlv_len);
                break;
            case CL_OPTION_CCC:
                opt_len = tlv_len;
                field_len = 0;
                subtree = proto_item_add_subtree(ti, ett_dhcpv6_vendor_option);
                proto_item_append_text(ti, " (%d bytes)", opt_len);
                while (field_len < opt_len) {
                    sub_value = dissect_packetcable_ccc_option(subtree, ti, pinfo, tvb,
                                                               sub_off, (opt_len - field_len));
                    sub_off += sub_value;
                    field_len += sub_value;
                }
                break;
            case CL_OPTION_CCCV6:
                opt_len = tlv_len;
                field_len = 0;
                subtree = proto_item_add_subtree(ti, ett_dhcpv6_vendor_option);
                proto_item_append_text(ti, " (%d bytes)", opt_len);
                while (field_len < opt_len) {
                    sub_value = dissect_packetcable_cccV6_option(subtree, ti, pinfo, tvb,
                        sub_off, (opt_len - field_len));
                    sub_off += sub_value;
                    field_len += sub_value;
                }
                break;
            case CL_OPTION_CORRELATION_ID:
                opt_len = tlv_len;
                 if (tlv_len != 4) {
                    proto_item_append_text(ti, "Bogus value length=%d",
                                           tlv_len);
                }
                else {
                    proto_item_append_text(ti, "%u", tvb_get_ntohl(tvb, sub_off));
                }
                break;
            default:
                opt_len = tlv_len;
                break;
            }
            off += (opt_len + 4);

        }
    }
    else {
        expert_add_info_format(pinfo, v_item, &ei_dhcpv6_bogus_length, "Bogus length: %d", len);
    }
}

static void
cablelabs_fmt_docsis_version( gchar *result, guint32 revision )
{
   g_snprintf( result, ITEM_LABEL_LENGTH, "%d.%02d", (guint8)(( revision & 0xFF00 ) >> 8), (guint8)(revision & 0xFF) );
}


/* Returns the number of bytes consumed by this option. */
static int
dhcpv6_option(tvbuff_t *tvb, packet_info *pinfo, proto_tree *bp_tree,
              int off, int eoff, gboolean *at_end, int protocol, hopcount_info hpi)
{
    guint16     opttype, hwtype, subopt_type;
    int         temp_optlen, optlen, subopt_len; /* 16-bit values that need 16-bit rollover protection */
    proto_item *ti = NULL, *option_item;
    proto_tree *subtree;
    proto_tree *subtree_2;
    int         i;
    guint16     duidtype;
    guint32     enterprise_no;
    guint      algorithm;

    /* option type and length must be present */
    if ((eoff - off) < 4) {
        *at_end = TRUE;
        return 0;
    }

    opttype = tvb_get_ntohs(tvb, off);
    optlen  = tvb_get_ntohs(tvb, off + 2);

    /* all option data must be present */
    if ((eoff - off) < (4 + optlen)) {
        *at_end = TRUE;
        return 0;
    }

    subtree = proto_tree_add_subtree(bp_tree, tvb, off, 4 + optlen, ett_dhcpv6_option, &option_item,
                             val_to_str_ext(opttype, &opttype_vals_ext, "DHCP option %u"));

    proto_tree_add_item(subtree, hf_option_type, tvb, off, 2, ENC_BIG_ENDIAN);
    proto_tree_add_item(subtree, hf_option_length, tvb, off + 2, 2, ENC_BIG_ENDIAN);
    off += 4;
    /* Right now, none of the options can be filtered at, so provide a hex
       array for minimalistic filtering */
    if (optlen)
        proto_tree_add_item(subtree, hf_option_value, tvb, off, optlen, ENC_NA);

    switch (opttype) {
    case OPTION_CLIENTID:
        col_append_fstr(pinfo->cinfo, COL_INFO, "CID: %s ", tvb_bytes_to_str(wmem_packet_scope(), tvb, off, optlen));
        /* Fall through */
    case OPTION_SERVERID:
    case OPTION_RELAYID:
        if (optlen < 2) {
            expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "DUID: malformed option");
            break;
        }
        proto_tree_add_item(subtree, hf_duid_bytes, tvb, off, optlen, ENC_NA);
        duidtype = tvb_get_ntohs(tvb, off);
        proto_tree_add_item(subtree, hf_duid_type, tvb, off, 2, ENC_BIG_ENDIAN);
        switch (duidtype) {
        case DUID_LLT:
        {
            nstime_t llt_time;

            if (optlen < 8) {
                expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "DUID: malformed option");
                break;
            }
            proto_tree_add_item(subtree, hf_duidllt_hwtype, tvb, off + 2, 2, ENC_BIG_ENDIAN);

            /* Packet specifies seconds since Jan 1 2000, so add 946684800U (30 years) to get back to epoch */
            llt_time.secs = tvb_get_ntohl(tvb, off + 4) + 946684800U;
            llt_time.nsecs = 0;

            proto_tree_add_time(subtree, hf_duidllt_time, tvb, off + 4, 4, &llt_time);
            if (optlen > 8) {
                hwtype = tvb_get_ntohs(tvb, off + 2);
                proto_tree_add_string(subtree, hf_duidllt_link_layer_addr, tvb, off + 8,
                                    optlen - 8, tvb_arphrdaddr_to_str(tvb, off+8, optlen-8, hwtype));
            }
        }
        break;
        case DUID_EN:
            if (optlen < 6) {
                expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "DUID: malformed option");
                break;
            }
            proto_tree_add_item(subtree, hf_duiden_enterprise, tvb, off + 2, 4, ENC_BIG_ENDIAN);
            if (optlen > 6) {
                proto_tree_add_item(subtree, hf_duiden_identifier, tvb, off + 6, optlen - 6, ENC_NA);
            }
            break;
        case DUID_LL:
            if (optlen < 4) {
                expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "DUID: malformed option");
                break;
            }
            proto_tree_add_item(subtree, hf_duidll_hwtype, tvb, off + 2, 2, ENC_BIG_ENDIAN);
            if (optlen > 4) {
                hwtype = tvb_get_ntohs(tvb, off + 2);
                proto_tree_add_string(subtree, hf_duidll_link_layer_addr, tvb, off + 4,
                                    optlen - 4, tvb_arphrdaddr_to_str(tvb, off+4, optlen-4, hwtype));
            }
            break;
        case DUID_UUID:
            if (optlen != 18) {
                expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "DUID: malformed option");
                break;
            }
            proto_tree_add_item(subtree, hf_duiduuid_bytes, tvb, off + 2, 16, ENC_NA);
            break;
        }
        break;
    case OPTION_NTP_SERVER:
        if (optlen < 4) {
            expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "NTP Server: malformed option");
            break;
        }
        temp_optlen = 0;
        while (optlen > temp_optlen) {
            subopt_type = tvb_get_ntohs(tvb, off + temp_optlen);
            subopt_len = tvb_get_ntohs(tvb,  off + 2 + temp_optlen);
            if (subopt_len > optlen - temp_optlen) {
                expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "NFS Server: suboption too long");
                break;
            }
            subtree_2 = proto_tree_add_subtree(subtree, tvb, off+temp_optlen, 4 + subopt_len, ett_dhcpv6_netserver_option, &ti,
                                     val_to_str(subopt_type, ntp_server_opttype_vals, "NTP Server suboption %u"));
            proto_tree_add_item(subtree_2, hf_option_ntpserver_type,   tvb, off + temp_optlen,     2, ENC_BIG_ENDIAN);
            proto_tree_add_item(subtree_2, hf_option_ntpserver_length, tvb, off + temp_optlen + 2, 2, ENC_BIG_ENDIAN);
            temp_optlen += 4;
            switch (subopt_type) {
            case NTP_SUBOPTION_SRV_ADDR:
                proto_tree_add_item(subtree_2, hf_option_ntpserver_addr,    tvb, off + temp_optlen, 16, ENC_NA);
                break;
            case NTP_SUBOPTION_MC_ADDR:
                proto_tree_add_item(subtree_2, hf_option_ntpserver_mc_addr, tvb, off + temp_optlen, 16, ENC_NA);
                break;
            case NTP_SUBOPTION_SRV_FQDN:
                /* RFC 5906: section 4.3: "Internationalized domain names are not allowed ..." */
                dhcpv6_domain(subtree_2, ti, pinfo, hf_option_ntpserver_fqdn, tvb, off + temp_optlen, subopt_len);
                break;
            }

            temp_optlen += subopt_len;
        }
        break;
    case OPTION_S46_RULE:
    {
        guint8 ipv4_pref_len, ipv6_pref_len;
        int ipv6_pref_len_bytes;

        if (optlen < 8) {
            expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "S46_RULE: malformed option");
            break;
        }

        /*  0 1 2 3 4 5 6 7
         * +-+-+-+-+-+-+-+-+
         * |Reserved     |F|
         * +-+-+-+-+-+-+-+-+
         */
        proto_tree_add_bitmask(subtree, tvb, off, hf_option_s46_rule_flags, ett_dhcpv6_s46_rule_flags, dhcpv6_s46_rule_flags_fields, ENC_BIG_ENDIAN);
        proto_tree_add_item(subtree, hf_option_s46_rule_ea_len, tvb, off + 1, 1, ENC_BIG_ENDIAN);
        proto_tree_add_item(subtree, hf_option_s46_rule_ipv4_pref_len, tvb, off + 2, 1, ENC_BIG_ENDIAN);
        ipv4_pref_len = tvb_get_guint8(tvb, off + 2);

        if (ipv4_pref_len > 32) {
            expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "S46_RULE: malformed option");
            break;
        }

        proto_tree_add_item(subtree, hf_option_s46_rule_ipv4_prefix, tvb, off + 3, 4, ENC_NA);
        proto_tree_add_item(subtree, hf_option_s46_rule_ipv6_pref_len, tvb, off + 7, 1, ENC_BIG_ENDIAN);
        ipv6_pref_len = tvb_get_guint8(tvb, off + 7);

        if (ipv6_pref_len > 128) {
            expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "S46_RULE: malformed option");
            break;
        }

        ipv6_pref_len_bytes =
            dissect_dhcpv6_s46_ipv6_prefix(tvb, hf_option_s46_rule_ipv6_prefix, off + 8, ipv6_pref_len, subtree);

        temp_optlen = 8 + ipv6_pref_len_bytes;
        while ((optlen - temp_optlen) > 0) {
            temp_optlen += dhcpv6_option(tvb, pinfo, subtree,
                                         off+temp_optlen, off + optlen, at_end, protocol, hpi);
            if (*at_end) {
                /* Bad option - just skip to the end */
                temp_optlen = optlen;
            }
        }
    }
    break;
    case OPTION_S46_BR:
        if (optlen != 16) {
            expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "S46_BR: malformed option");
            break;
        }

        proto_tree_add_item(subtree, hf_option_s46_br_address, tvb, off, 16, ENC_NA);
        break;
    case OPTION_S46_DMR:
    {
        guint8 dmr_pref_len;

        if (optlen < 1 || optlen > 17) {
            expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "S46_DMR: malformed option");
            break;
        }

        proto_tree_add_item(subtree, hf_option_s46_dmr_pref_len, tvb, off, 1, ENC_BIG_ENDIAN);
        dmr_pref_len = tvb_get_guint8(tvb, off);

        if (dmr_pref_len > 128) {
            expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "S46_DMR: malformed option");
            break;
        }

        dissect_dhcpv6_s46_ipv6_prefix(tvb, hf_option_s46_dmr_prefix, off + 1, dmr_pref_len, subtree);
    }
    break;
    case OPTION_S46_V4V6BIND:
    {
        guint8 ipv6_pref_len;
        int ipv6_pref_len_bytes;

        if (optlen < 5) {
            expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "S46_V4V6BIND: malformed option");
            break;
        }

        proto_tree_add_item(subtree, hf_option_s46_v4v6bind_ipv4_address, tvb, off, 4, ENC_NA);
        proto_tree_add_item(subtree, hf_option_s46_v4v6bind_ipv6_pref_len, tvb, off + 4, 1, ENC_BIG_ENDIAN);
        ipv6_pref_len = tvb_get_guint8(tvb, off + 4);

        if (ipv6_pref_len > 128) {
            expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "S46_V4V6BIND: malformed option");
            break;
        }

        ipv6_pref_len_bytes =
            dissect_dhcpv6_s46_ipv6_prefix(tvb, hf_option_s46_v4v6bind_ipv6_prefix, off + 5, ipv6_pref_len, subtree);

        temp_optlen = 5 + ipv6_pref_len_bytes;
        while ((optlen - temp_optlen) > 0) {
            temp_optlen += dhcpv6_option(tvb, pinfo, subtree,
                                         off+temp_optlen, off + optlen, at_end, protocol, hpi);
            if (*at_end) {
                /* Bad option - just skip to the end */
                temp_optlen = optlen;
            }
        }
    }
    break;
    case OPTION_S46_PORTPARAMS:
    {
        guint16 psid;
        guint8 offset, psid_len;

        if (optlen != 4) {
            expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "S46_PORTPARAMS: malformed option");
            break;
        }

        proto_tree_add_item(subtree, hf_option_s46_portparam_offset, tvb, off, 1, ENC_BIG_ENDIAN);
        offset = tvb_get_guint8(tvb, off);

        if (offset > 15) {
            expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "S46_PORTPARAMS: malformed option");
            break;
        }

        proto_tree_add_item(subtree, hf_option_s46_portparam_psid_len, tvb, off + 1, 1, ENC_BIG_ENDIAN);
        psid_len = tvb_get_guint8(tvb, off + 1);

        if (psid_len > 16) {
            expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "S46_PORTPARAMS: malformed option");
            break;
        }

        psid = tvb_get_ntohs(tvb, off + 2);
        proto_tree_add_uint(subtree, hf_option_s46_portparam_psid, tvb, off + 2, 2, psid >> (16 - psid_len));
    }
    break;
    case OPTION_S46_CONT_MAPE:
    case OPTION_S46_CONT_MAPT:
    case OPTION_S46_CONT_LW:
        temp_optlen = 0;
        while ((optlen - temp_optlen) > 0) {
            temp_optlen += dhcpv6_option(tvb, pinfo, subtree,
                                         off+temp_optlen, off + optlen, at_end, protocol, hpi);
            if (*at_end) {
                /* Bad option - just skip to the end */
                temp_optlen = optlen;
            }
        }
        break;
    case OPTION_IA_NA:
    case OPTION_IA_PD:
        if (optlen < 12) {
            if (opttype == OPTION_IA_NA)
                expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "IA_NA: malformed option");
            else
                expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "IA_PD: malformed option");
            break;
        }
        proto_tree_add_string(subtree, hf_iaid, tvb, off,
                                    4, tvb_arphrdaddr_to_str(tvb, off, 4, opttype));  /* XXX: IAID is opaque ? review ... */
        if (tvb_get_ntohl(tvb, off+4) == DHCPV6_LEASEDURATION_INFINITY) {
            proto_tree_add_uint_format_value(subtree, hf_iaid_t1, tvb, off+4,
                                    4, DHCPV6_LEASEDURATION_INFINITY, "infinity");
        } else {
            proto_tree_add_item(subtree, hf_iaid_t1, tvb, off+4,
                                    4, ENC_BIG_ENDIAN);
        }

        if (tvb_get_ntohl(tvb, off+8) == DHCPV6_LEASEDURATION_INFINITY) {
            proto_tree_add_uint_format_value(subtree, hf_iaid_t2, tvb, off+8,
                                    4, DHCPV6_LEASEDURATION_INFINITY, "infinity");
        } else {
            proto_tree_add_item(subtree, hf_iaid_t2, tvb, off+8,
                                    4, ENC_BIG_ENDIAN);
        }

        temp_optlen = 12;
        while ((optlen - temp_optlen) > 0) {
            temp_optlen += dhcpv6_option(tvb, pinfo, subtree,
                                         off+temp_optlen, off + optlen, at_end, protocol, hpi);
            if (*at_end) {
                /* Bad option - just skip to the end */
                temp_optlen = optlen;
            }
        }
        break;
    case OPTION_IA_TA:
        if (optlen < 4) {
            expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "IA_TA: malformed option");
            break;
        }
        proto_tree_add_string(subtree, hf_iata, tvb, off,
                                    4, tvb_arphrdaddr_to_str(tvb, off, 4, opttype));  /* XXX: IAID is opaque ? review ... */
        temp_optlen = 4;
        while ((optlen - temp_optlen) > 0) {
            temp_optlen += dhcpv6_option(tvb, pinfo, subtree,
                                         off+temp_optlen, off + optlen, at_end, protocol, hpi);
            if (*at_end) {
                /* Bad option - just skip to the end */
                temp_optlen = optlen;
            }
        }
        break;
    case OPTION_IAADDR:
    {
        guint32 preferred_lifetime, valid_lifetime;

        if (optlen < 24) {
            expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "IA_TA: malformed option");
            break;
        }

        proto_tree_add_item(subtree, hf_iaaddr_ip, tvb, off, 16, ENC_NA);
        col_append_fstr(pinfo->cinfo, COL_INFO, "IAA: %s ", tvb_ip6_to_str(tvb, off));

        preferred_lifetime = tvb_get_ntohl(tvb, off + 16);
        valid_lifetime = tvb_get_ntohl(tvb, off + 20);

        if (preferred_lifetime == DHCPV6_LEASEDURATION_INFINITY) {
            proto_tree_add_uint_format_value(subtree, hf_iaaddr_pref_lifetime, tvb, off+16,
                                    4, DHCPV6_LEASEDURATION_INFINITY, "infinity");
        } else {
            proto_tree_add_item(subtree, hf_iaaddr_pref_lifetime, tvb, off+16,
                                    4, ENC_BIG_ENDIAN);
        }
        if (valid_lifetime == DHCPV6_LEASEDURATION_INFINITY) {
            proto_tree_add_uint_format(subtree, hf_iaaddr_valid_lifetime, tvb, off+20,
                                    4, DHCPV6_LEASEDURATION_INFINITY, "Preferred lifetime: infinity");
        } else {
            proto_tree_add_item(subtree, hf_iaaddr_valid_lifetime, tvb, off+20,
                                    4, ENC_BIG_ENDIAN);
        }

        temp_optlen = 24;
        while ((optlen - temp_optlen) > 0) {
            temp_optlen += dhcpv6_option(tvb, pinfo, subtree,
                                         off+temp_optlen, off + optlen, at_end, protocol, hpi);
            if (*at_end) {
                /* Bad option - just skip to the end */
                temp_optlen = optlen;
            }
        }
    }
    break;
    case OPTION_ORO:
    case OPTION_ERO:
        for (i = 0; i < optlen; i += 2) {
            proto_tree_add_item(subtree, hf_requested_option_code, tvb, off+i,
                                    2, ENC_BIG_ENDIAN);
        }
        break;
    case OPTION_PREFERENCE:
        if (optlen != 1) {
            expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "PREFERENCE: malformed option");
            break;
        }
        proto_tree_add_item(subtree, hf_option_preference, tvb, off, 1, ENC_BIG_ENDIAN);
        break;
    case OPTION_ELAPSED_TIME:
        if (optlen != 2) {
            expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "ELAPSED-TIME: malformed option");
            break;
        }

        temp_optlen = tvb_get_ntohs(tvb, off);
        proto_tree_add_uint(subtree, hf_elapsed_time, tvb, off, 2, temp_optlen*10);
        break;
    case OPTION_RELAY_MSG:
        if (optlen == 0) {
            expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "RELAY-MSG: malformed option");
        } else {
            /* here, we should dissect a full DHCP message */
            dissect_dhcpv6(tvb, pinfo, subtree, off, off + optlen, hpi);
        }
        break;
    case OPTION_AUTH:
        if (optlen < 11) {
            expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "AUTH: malformed option");
            break;
        }

        proto_tree_add_item(subtree, hf_auth_protocol, tvb, off, 1, ENC_BIG_ENDIAN);
        proto_tree_add_item_ret_uint(subtree, hf_auth_algorithm, tvb, off+1, 1, ENC_BIG_ENDIAN, &algorithm);
        proto_tree_add_item(subtree, hf_auth_rdm, tvb, off+2, 1, ENC_BIG_ENDIAN);
        proto_tree_add_item(subtree, hf_auth_replay_detection, tvb, off+3, 8, ENC_NA);
        if (optlen > 11+20 && algorithm == 1) {  // RFC 3315, HMAC-MD5 (16) + Key ID (4) => 20 bytes
            if (optlen-11-20 < 256) {
                proto_tree_add_item(subtree, hf_auth_realm, tvb, off+11, optlen-11-20, ENC_ASCII|ENC_NA);
            } else {
                expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "DHCP realm: probably malformed option");
            }
            proto_tree_add_item(subtree, hf_auth_key_id, tvb, off+optlen-16-4, 4, ENC_BIG_ENDIAN);
            proto_tree_add_item(subtree, hf_auth_md5_data, tvb, off+optlen-16, 16, ENC_NA);
        } else {
            proto_tree_add_item(subtree, hf_auth_info, tvb, off+11, optlen-11, ENC_NA);
        }
        break;
    case OPTION_UNICAST:
        if (optlen != 16) {
            expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "UNICAST: malformed option");
            break;
        }
        proto_tree_add_item(subtree, hf_opt_unicast, tvb, off, 16, ENC_NA);
        break;
    case OPTION_STATUS_CODE:
        proto_tree_add_item(subtree, hf_opt_status_code, tvb, off, 2, ENC_BIG_ENDIAN);
        if (optlen > 2)
            proto_tree_add_item(subtree, hf_opt_status_msg, tvb, off+2, optlen - 2, ENC_ASCII|ENC_NA);
        break;
    case OPTION_VENDOR_CLASS:
        if (optlen < 4) {
            expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "VENDOR_CLASS: malformed option");
            break;
        }
        proto_tree_add_item(subtree, hf_vendorclass_enterprise, tvb, off, 4, ENC_BIG_ENDIAN);
        if (optlen > 4)
            proto_tree_add_item(subtree, hf_vendorclass_data, tvb, off+6, optlen-6, ENC_ASCII|ENC_NA);
        break;
    case OPTION_VENDOR_OPTS:
        if (optlen < 4) {
            expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "VENDOR_OPTS: malformed option");
            break;
        }

        enterprise_no = tvb_get_ntohl(tvb, off);
        ti = proto_tree_add_item(subtree, hf_vendoropts_enterprise, tvb, off, 4, ENC_BIG_ENDIAN);

        if (optlen >= 4) {
            if (enterprise_no == 4491) {
                dissect_cablelabs_specific_opts(subtree, ti, pinfo, tvb, off+4, optlen-4);
            } else {
                int optoffset = 0;

                while ((optlen - 4 - optoffset) > 0) {
                    int olen = tvb_get_ntohs(tvb, off + optoffset + 6);
                    subtree_2 = proto_tree_add_subtree(subtree, tvb, off + optoffset + 4,
                                             4 + olen, ett_dhcpv6_option_vsoption, NULL, "option");
                    proto_tree_add_item(subtree_2, hf_vendoropts_enterprise_option_code, tvb, off + optoffset + 4, 2, ENC_BIG_ENDIAN);
                    proto_tree_add_item(subtree_2, hf_vendoropts_enterprise_option_length, tvb, off + optoffset + 6, 2, ENC_BIG_ENDIAN);
                    proto_tree_add_item(subtree_2, hf_vendoropts_enterprise_option_data, tvb, off + optoffset + 8, olen, ENC_NA);
                    optoffset += (4 + olen);
                }
            }
        }
        break;
    case OPTION_INTERFACE_ID:
    {
        if (optlen == 0) {
            expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "INTERFACE_ID: malformed option");
            break;
        }

        if (cablelabs_interface_id) {
            gint namelen = tvb_strnlen(tvb, off, optlen)+1;
            if (namelen == 0) {
                proto_tree_add_item(subtree, hf_cablelabs_interface_id, tvb, off, optlen, ENC_ASCII|ENC_NA);
            } else {
                proto_tree_add_item(subtree, hf_cablelabs_interface_id, tvb, off, namelen-1, ENC_ASCII|ENC_NA);

                temp_optlen = optlen - namelen;
                off += namelen;
                if (temp_optlen >= 6)
                    proto_tree_add_string(subtree, hf_cablelabs_interface_id_link_address, tvb, off, temp_optlen, tvb_arphrdaddr_to_str(tvb, off, 6, ARPHRD_ETHER));
            }
        } else {
            proto_tree_add_item(subtree, hf_interface_id, tvb, off, optlen, ENC_NA);
        }
    }
    break;
    case OPTION_RECONF_MSG:
        if (optlen != 1) {
            expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "RECONF_MSG: malformed option");
            break;
        }

        proto_tree_add_item(subtree, hf_reconf_msg, tvb, off, 1, ENC_BIG_ENDIAN);
        break;
    case OPTION_RECONF_ACCEPT:
        if (optlen)
            expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "RECONF_ACCEPT: malformed option");
        break;
    case OPTION_SIP_SERVER_D:
        if (optlen > 0) {
            subtree_2 = proto_tree_add_subtree(subtree, tvb, off, optlen, ett_dhcpv6_sip_server_domain_search_list_option, &ti, "SIP Servers Domain Search List");
            dhcpv6_domain(subtree_2, ti, pinfo, hf_sip_server_domain_search_fqdn, tvb, off, optlen);
        }
        break;
    case OPTION_SIP_SERVER_A:
        if (optlen % 16) {
            expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "SIP servers address: malformed option");
            break;
        }

        for (i = 0; i < optlen; i += 16)
            proto_tree_add_item(subtree, hf_sip_server_a, tvb, off + i, 16, ENC_NA);
        break;
    case OPTION_DNS_SERVERS:
        if (optlen % 16) {
            expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "DNS servers address: malformed option");
            break;
        }

        for (i = 0; i < optlen; i += 16) {
            ti = proto_tree_add_item(subtree, hf_dns_servers, tvb, off + i, 16, ENC_NA);
            proto_item_prepend_text(ti, " %d ", i/16 + 1);
        }
        break;

    case OPTION_DOMAIN_LIST:
        if (optlen > 0) {
            subtree_2 = proto_tree_add_subtree(subtree, tvb, off, optlen, ett_dhcpv6_dns_domain_search_list_option, &ti, "DNS Domain Search List");
            dhcpv6_domain(subtree_2, ti, pinfo, hf_domain_search_list_fqdn, tvb, off, optlen);
        }
        break;

    /* NIS...: RFC 3898 */
    case OPTION_NIS_SERVERS:
        if (optlen % 16) {
            expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "NIS servers address: malformed option");
            break;
        }
        for (i = 0; i < optlen; i += 16)
            proto_tree_add_item(subtree, hf_nis_servers, tvb, off + i, 16, ENC_NA);
        break;
    case OPTION_NISP_SERVERS:
        if (optlen % 16) {
            expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "NISP servers address: malformed option");
            break;
        }
        for (i = 0; i < optlen; i += 16)
            proto_tree_add_item(subtree, hf_nisp_servers, tvb, off + i, 16, ENC_NA);
        break;
    case OPTION_NIS_DOMAIN_NAME:
        if (optlen > 0) {
            subtree_2 = proto_tree_add_subtree(subtree, tvb, off, optlen, ett_dhcpv6_nis_domain_name_option, &ti, "nis-domain-name");
            dhcpv6_domain(subtree_2, ti, pinfo, hf_nis_fqdn, tvb, off, optlen);
        }
        break;
    case OPTION_NISP_DOMAIN_NAME:
        if (optlen > 0) {
            subtree_2 = proto_tree_add_subtree(subtree, tvb, off, optlen, ett_dhcpv6_nisp_domain_name_option, &ti, "nisp-domain-name");
            dhcpv6_domain(subtree_2, ti, pinfo, hf_nisp_fqdn, tvb, off, optlen);
        }
        break;

    case OPTION_SNTP_SERVERS:
        /* Deprecated as of RFC 5908 */
        if (optlen % 16) {
            expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "SNTP servers address: malformed option");
            break;
        }
        for (i = 0; i < optlen; i += 16){
            ti = proto_tree_add_item(subtree, hf_sntp_servers, tvb, off + i, 16, ENC_NA);
            proto_item_prepend_text(ti, " %d ", i/16 + 1);
            }
        break;
    case OPTION_LIFETIME:
        if (optlen != 4) {
            expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "LIFETIME: malformed option");
            break;
        }
        proto_tree_add_item(subtree, hf_opt_lifetime, tvb, off, 4, ENC_BIG_ENDIAN);
        break;

    /* BCMCS...: RFC 4280 */
    case OPTION_BCMCS_SERVER_D:
        if (optlen > 0) {
            subtree_2 = proto_tree_add_subtree(subtree, tvb, off, optlen, ett_dhcpv6_bcmcs_servers_domain_search_list_option, &ti, "BCMCS Servers Domain Search List");
            dhcpv6_domain(subtree_2, ti, pinfo, hf_bcmcs_servers_fqdn, tvb, off, optlen);
        }
        break;
    case OPTION_BCMCS_SERVER_A:
        if (optlen % 16) {
            expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "BCMCS servers address: malformed option");
            break;
        }
        for (i = 0; i < optlen; i += 16)
            proto_tree_add_item(subtree, hf_bcmcs_servers_a, tvb, off + i, 16, ENC_NA);
        break;

    case OPTION_REMOTE_ID:
        if (optlen < 4) {
            expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "REMOTE_ID: malformed option");
            break;
        }
        proto_tree_add_item(subtree, hf_remoteid_enterprise, tvb, off, 4, ENC_BIG_ENDIAN);
        off += 4;
        proto_tree_add_item(subtree, hf_remoteid_enterprise_id, tvb, off, optlen - 4, ENC_NA);
        break;
    case OPTION_SUBSCRIBER_ID:
        if (optlen == 0) {
            expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "SUBSCRIBER_ID: malformed option");
            break;
        }
        proto_tree_add_item(subtree, hf_subscriber_id, tvb, off, optlen, ENC_ASCII|ENC_NA);
        break;
    case OPTION_CLIENT_FQDN:
        if (optlen < 1) {
            expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "FQDN: malformed option");
        } else {
            /*
             * +-----+-+-+-+
             * | MBZ |N|O|S|
             * +-----+-+-+-+
             */
            proto_tree_add_item(subtree, hf_clientfqdn_reserved, tvb, off, 1, ENC_BIG_ENDIAN);
            proto_tree_add_item(subtree, hf_clientfqdn_n, tvb, off, 1, ENC_BIG_ENDIAN);
            proto_tree_add_item(subtree, hf_clientfqdn_o, tvb, off, 1, ENC_BIG_ENDIAN);
            proto_tree_add_item(subtree, hf_clientfqdn_s, tvb, off, 1, ENC_BIG_ENDIAN);
            dhcpv6_domain(subtree, option_item, pinfo, hf_client_fqdn, tvb, off+1, optlen-1);
        }
        break;
    case OPTION_PANA_AGENT:
        if (optlen % 16) {
            expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "PANA agent address: malformed option");
            break;
        }
        for (i = 0; i < optlen; i += 16)
            proto_tree_add_item(subtree, hf_pana_agent, tvb, off + i, 16, ENC_NA);
        break;
    case OPTION_TIME_ZONE:
        if (optlen > 0)
            proto_tree_add_item(subtree, hf_opt_timezone, tvb, off, optlen, ENC_ASCII|ENC_NA);
        break;
    case OPTION_TZDB:
        if (optlen > 0)
            proto_tree_add_item(subtree, hf_opt_tzdb, tvb, off, optlen, ENC_ASCII|ENC_NA);
        break;

    case OPTION_MUDURL:
        if (optlen > 0)
            proto_tree_add_item(subtree, hf_opt_mudurl, tvb, off, optlen, ENC_ASCII|ENC_NA);
        break;

    case OPTION_LQ_QUERY:
    {
        guint8 query_type;
        if (optlen < 17) {
            expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "LQ-QUERY: malformed option");
            break;
        }
        query_type = tvb_get_guint8(tvb, off);
        ti = proto_tree_add_item(subtree, hf_lq_query, tvb, off, 1, ENC_BIG_ENDIAN);
        if ((protocol == proto_dhcpv6)           &&
            ((query_type == LQ_QUERY_RELAYID)      ||
             (query_type == LQ_QUERY_LINK_ADDRESS) ||
             (query_type == LQ_QUERY_REMOTEID))) {
            expert_add_info(pinfo, ti, &ei_dhcpv6_bulk_leasequery_bad_query_type);
        }

        proto_tree_add_item(subtree, hf_lq_query_link_address, tvb, off+1, 16, ENC_NA);
        temp_optlen = 17;
        while ((optlen - temp_optlen) > 0) {
            temp_optlen += dhcpv6_option(tvb, pinfo, subtree,
                                         off + temp_optlen,
                                         off + optlen, at_end, protocol, hpi);
            if (*at_end) {
                /* Bad option - just skip to the end */
                temp_optlen = optlen;
            }
        }
    }
    break;
    case OPTION_CLIENT_DATA:
        temp_optlen = 0;
        while ((optlen - temp_optlen) > 0) {
            temp_optlen += dhcpv6_option(tvb, pinfo, subtree,
                                         off + temp_optlen,
                                         off + optlen, at_end, protocol, hpi);
            if (*at_end) {
                /* Bad option - just skip to the end */
                temp_optlen = optlen;
            }
        }
        break;
    case OPTION_CLT_TIME:
        if (optlen != 4) {
            expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "CLT_TIME: malformed option");
            break;
        }

        proto_tree_add_item(subtree, hf_clt_time, tvb, off, 4, ENC_BIG_ENDIAN);
        break;
    case OPTION_LQ_RELAY_DATA:
        if (optlen < 16) {
            expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "LQ_RELAY_DATA: malformed option");
            break;
        }

        proto_tree_add_item(subtree, hf_lq_relay_data_peer_addr, tvb, off, 16, ENC_NA);
        proto_tree_add_item(subtree, hf_lq_relay_data_msg, tvb, off+16, optlen - 16, ENC_ASCII|ENC_NA);
        break;
    case OPTION_LQ_CLIENT_LINK:
        if (optlen % 16) {
            expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "LQ client links address: malformed option");
            break;
        }
        for (i = 0; i < optlen; i += 16)
            proto_tree_add_item(subtree, hf_lq_client_link, tvb, off + i, 16, ENC_NA);
        break;
    case OPTION_CAPWAP_AC_V6:
        if (optlen % 16) {
            expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "CAPWAP Access Controllers address: malformed option");
            break;
        }
        for (i = 0; i < optlen; i += 16)
            proto_tree_add_item(subtree, hf_capwap_ac_v6, tvb, off + i, 16, ENC_NA);
        break;

    case OPTION_AFTR_NAME:
    {
        dhcpv6_domain(subtree, option_item, pinfo, hf_aftr_name, tvb, off, optlen);
        break;
    }

    case OPTION_IAPREFIX:
        if (optlen < 25) {
            expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "IAPREFIX: malformed option");
            break;
        }

        if (tvb_get_ntohl(tvb, off) == DHCPV6_LEASEDURATION_INFINITY) {
            proto_tree_add_uint_format_value(subtree, hf_iaprefix_pref_lifetime, tvb, off,
                                    4, DHCPV6_LEASEDURATION_INFINITY, "infinity");
        } else {
            proto_tree_add_item(subtree, hf_iaprefix_pref_lifetime, tvb, off,
                                    4, ENC_BIG_ENDIAN);
        }
        if (tvb_get_ntohl(tvb, off + 4) == DHCPV6_LEASEDURATION_INFINITY) {
            proto_tree_add_uint_format_value(subtree, hf_iaprefix_valid_lifetime, tvb, off+4,
                                    4, DHCPV6_LEASEDURATION_INFINITY, "infinity");
        } else {
            proto_tree_add_item(subtree, hf_iaprefix_valid_lifetime, tvb, off+4,
                                    4, ENC_BIG_ENDIAN);
        }
        proto_tree_add_item(subtree, hf_iaprefix_pref_len, tvb, off+8, 1, ENC_BIG_ENDIAN);
        proto_tree_add_item(subtree, hf_iaprefix_pref_addr, tvb, off+9, 16, ENC_NA);
        temp_optlen = 25;
        while ((optlen - temp_optlen) > 0) {
            temp_optlen += dhcpv6_option(tvb, pinfo, subtree,
                                         off+temp_optlen, off + optlen, at_end, protocol, hpi);
            if (*at_end) {
                /* Bad option - just skip to the end */
                temp_optlen = optlen;
            }
        }
        break;
    case OPTION_MIP6_HA:
        if (optlen != 16) {
            expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "MIP6_HA: malformed option");
            break;
        }
        proto_tree_add_item(subtree, hf_mip6_ha, tvb, off, 16, ENC_NA);
        break;
    case OPTION_MIP6_HOA:
        if (optlen != 16) {
            expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "MIP6_HOA: malformed option");
            break;
        }

        proto_tree_add_item(subtree, hf_mip6_hoa, tvb, off, 16, ENC_NA);
        break;
    case OPTION_NAI:
        if (optlen < 4) {
            expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "NAI: malformed option");
            break;
        }
        proto_tree_add_item(subtree, hf_nai, tvb, off, optlen - 2, ENC_ASCII|ENC_NA);
        break;
    case OPTION_PD_EXCLUDE:
        if ((optlen < 2) || (optlen > 17)) {
            expert_add_info_format(pinfo, option_item, &ei_dhcpv6_malformed_option, "PD_EXCLUDE: malformed option");
            break;
        }
        proto_tree_add_item(subtree, hf_pd_exclude_pref_len, tvb, off, 1, ENC_BIG_ENDIAN);
        proto_tree_add_item(subtree, hf_pd_exclude_subnet_id , tvb, off+1, optlen-1, ENC_NA);
        break;
    case OPTION_CAPTIVE_PORTAL:{
        proto_item *ti_cp;
        ti_cp = proto_tree_add_item(subtree, hf_option_captive_portal, tvb, off, optlen, ENC_ASCII|ENC_NA);
        PROTO_ITEM_SET_URL(ti_cp);
        break;
        }
    }

    return 4 + optlen;
}


/* May be called recursively */
static void
dissect_dhcpv6(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
               int off, int eoff, hopcount_info hpi)
{
    proto_tree        *bp_tree = NULL;
    proto_item        *ti;
    guint8             msgtype;
    gboolean           at_end;

    msgtype = tvb_get_guint8(tvb, off);

    col_append_fstr(pinfo->cinfo, COL_INFO, "%s ", val_to_str_ext(msgtype, &msgtype_vals_ext, "Message Type %u"));

    if (tree) {
        ti = proto_tree_add_item(tree, proto_dhcpv6, tvb, off, eoff - off, ENC_NA);
        bp_tree = proto_item_add_subtree(ti, ett_dhcpv6);
    }


    if ((msgtype == RELAY_FORW) || (msgtype == RELAY_REPLY)) {
        const guint8 previous_hopcount = hpi.hopcount;
        proto_item *previous_pi = hpi.pi;
        if (tree) {
            proto_tree_add_item(bp_tree, hf_dhcpv6_msgtype,  tvb, off,       1, ENC_BIG_ENDIAN);
            hpi.pi = proto_tree_add_item(bp_tree, hf_dhcpv6_hopcount, tvb, off + 1,   1, ENC_BIG_ENDIAN);
            proto_tree_add_item(bp_tree, hf_dhcpv6_linkaddr, tvb, off + 2,  16, ENC_NA);
            proto_tree_add_item(bp_tree, hf_dhcpv6_peeraddr, tvb, off + 18, 16, ENC_NA);

        }
        /* Check the hopcount not exceed the HOP_COUNT_LIMIT */
        hpi.hopcount = tvb_get_guint8(tvb, off + 1);
        if (hpi.hopcount > HOP_COUNT_LIMIT) {
          expert_add_info_format(pinfo, hpi.pi, &ei_dhcpv6_error_hopcount, "Hopcount (%d) exceeds the maximum limit HOP_COUNT_LIMIT (%d)", hpi.hopcount, HOP_COUNT_LIMIT);
        }
        /* Check hopcount is correctly incremented by 1 */
        if (hpi.relay_message_previously_detected && hpi.hopcount != previous_hopcount - 1) {
          expert_add_info_format(pinfo, previous_pi, &ei_dhcpv6_error_hopcount, "hopcount is not correctly incremented by 1 (expected : %d, actual : %d)", hpi.hopcount + 1, previous_hopcount);
        }
        hpi.relay_message_previously_detected = TRUE;
        col_append_fstr(pinfo->cinfo, COL_INFO, "L: %s ", tvb_ip6_to_str(tvb, off + 2));
        off += 34;
    } else {
        /* Check the inner hopcount equals 0 */
        if (hpi.hopcount) {
            expert_add_info_format(pinfo, hpi.pi, &ei_dhcpv6_error_hopcount, "Hopcount of most inner message has to equal 0 instead of %d", hpi.hopcount);
        }
        if (tree) {
            proto_tree_add_item(bp_tree, hf_dhcpv6_msgtype, tvb, off, 1, ENC_BIG_ENDIAN);
            proto_tree_add_item(bp_tree, hf_dhcpv6_xid, tvb, off + 1, 3, ENC_BIG_ENDIAN);
        }
        col_append_fstr(pinfo->cinfo, COL_INFO, "XID: 0x%x ", tvb_get_ntoh24(tvb, off + 1));
        off += 4;
    }

    at_end = FALSE;
    while ((off < eoff) && !at_end)
        off += dhcpv6_option(tvb, pinfo, bp_tree, off, eoff, &at_end, proto_dhcpv6, hpi);
}

static int
dissect_dhcpv6_stream(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
    hopcount_info hpi;
    initialize_hopount_info(&hpi);
    col_set_str(pinfo->cinfo, COL_PROTOCOL, "DHCPv6");
    col_clear(pinfo->cinfo, COL_INFO);
    dissect_dhcpv6(tvb, pinfo, tree, 0, tvb_reported_length(tvb), hpi);
    return tvb_captured_length(tvb);
}

static guint
get_dhcpv6_bulk_leasequery_pdu_len(packet_info *pinfo _U_, tvbuff_t *tvb,
                                   int offset, void *data _U_)
{
    return (tvb_get_ntohs(tvb, offset)+2);
}

static int
dissect_dhcpv6_bulk_leasequery_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
    proto_item *ti;
    proto_tree *bulk_tree, *option_tree;
    gint        offset = 0, end;
    guint16     size, trans_id;
    guint8      msg_type;
    gboolean    at_end = FALSE;
    hopcount_info hpi;
    initialize_hopount_info(&hpi);

    col_set_str(pinfo->cinfo, COL_PROTOCOL, "DHCPv6 BulkLease");
    col_clear(pinfo->cinfo, COL_INFO);

    ti = proto_tree_add_item(tree, proto_dhcpv6_bulk_leasequery, tvb, 0, -1, ENC_NA );
    bulk_tree = proto_item_add_subtree(ti, ett_dhcpv6_bulk_leasequery);

    size = tvb_get_ntohs(tvb, offset);
    proto_tree_add_item(bulk_tree, hf_dhcpv6_bulk_leasequery_size, tvb, offset, 2, ENC_BIG_ENDIAN);
    offset += 2;

    msg_type = tvb_get_guint8( tvb, offset );
    ti = proto_tree_add_item(bulk_tree, hf_dhcpv6_bulk_leasequery_msgtype, tvb, offset, 1, ENC_BIG_ENDIAN);
    if ((msg_type != LEASEQUERY)       &&
        (msg_type != LEASEQUERY_REPLY) &&
        (msg_type != LEASEQUERY_DONE)  &&
        (msg_type != LEASEQUERY_DATA))
        expert_add_info_format(pinfo, ti, &ei_dhcpv6_bulk_leasequery_bad_msg_type,
            "Message Type %d not allowed by DHCPv6 Bulk Leasequery", msg_type);

    offset += 1;
    proto_tree_add_item(bulk_tree, hf_dhcpv6_bulk_leasequery_reserved, tvb, offset, 1, ENC_BIG_ENDIAN);
    offset += 1;

    trans_id = tvb_get_ntohs(tvb, offset);
    proto_tree_add_item(bulk_tree, hf_dhcpv6_bulk_leasequery_trans_id, tvb, offset, 2, ENC_BIG_ENDIAN);
    offset += 2;

    col_add_fstr(pinfo->cinfo, COL_INFO, "%s, Transaction ID: %5u",
                      val_to_str_ext_const(msg_type, &msgtype_vals_ext, "Unknown"), trans_id);

    option_tree = proto_tree_add_subtree(bulk_tree, tvb, offset, -1, ett_dhcpv6_bulk_leasequery_options, NULL, "DHCPv6 Options");
    end = size + 2;
    while ((offset < end) && !at_end)
        offset += dhcpv6_option(tvb, pinfo, option_tree, offset,
                                end, &at_end, proto_dhcpv6_bulk_leasequery, hpi);

    return tvb_reported_length(tvb);
}

static int
dissect_dhcpv6_bulk_leasequery(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
{
    tcp_dissect_pdus(tvb, pinfo, tree, dhcpv6_bulk_leasequery_desegment, 2,
                    get_dhcpv6_bulk_leasequery_pdu_len, dissect_dhcpv6_bulk_leasequery_pdu, data);
    return tvb_reported_length(tvb);
}

static int dissect_dhcpv6_s46_ipv6_prefix(tvbuff_t *tvb, int hf, int offset, int prefix_length, proto_tree *tree)
{

    int bytes_to_process;
    ws_in6_addr prefix;

    bytes_to_process = (((prefix_length + 7) & 0xf8) >> 3);

    memset(prefix.bytes, 0, sizeof prefix.bytes);
    if (bytes_to_process != 0) {
        tvb_memcpy(tvb, prefix.bytes, offset, bytes_to_process);
    }
    proto_tree_add_ipv6(tree, hf, tvb, offset, bytes_to_process, &prefix);

    return bytes_to_process;
}

void
proto_register_dhcpv6(void)
{
    module_t *bulkquery_module;
    module_t *dhcpv6_module;

    static hf_register_info hf[] = {

        /* DHCPv6 header */
        { &hf_dhcpv6_msgtype,
          { "Message type", "dhcpv6.msgtype", FT_UINT8, BASE_DEC | BASE_EXT_STRING, &msgtype_vals_ext, 0x0, NULL, HFILL }},
        { &hf_dhcpv6_hopcount,
          { "Hopcount", "dhcpv6.hopcount", FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL}},
        { &hf_dhcpv6_xid,
          { "Transaction ID", "dhcpv6.xid", FT_UINT24, BASE_HEX, NULL, 0, NULL, HFILL}},
        { &hf_dhcpv6_linkaddr,
          { "Link address", "dhcpv6.linkaddr", FT_IPv6, BASE_NONE, NULL, 0, NULL, HFILL}},
        { &hf_dhcpv6_peeraddr,
          { "Peer address", "dhcpv6.peeraddr", FT_IPv6, BASE_NONE, NULL, 0, NULL, HFILL}},
        /* Generic option stuff */
        { &hf_option_type,
          { "Option", "dhcpv6.option.type", FT_UINT16, BASE_DEC | BASE_EXT_STRING, &opttype_vals_ext, 0x0, NULL, HFILL}},
        { &hf_option_length,
          { "Length", "dhcpv6.option.length", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL}},
        { &hf_option_value,
          { "Value", "dhcpv6.option.value", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL}},
        /* Individual options */
        { &hf_clientfqdn_reserved,
          { "Reserved", "dhcpv6.clientfqdn.reserved", FT_UINT8, BASE_HEX, NULL, 0xF8, NULL, HFILL}},
        { &hf_clientfqdn_n,
          { "N bit", "dhcpv6.clientfqdn.n", FT_BOOLEAN, 8, TFS(&fqdn_n), 0x4, "Whether the server SHOULD NOT perform any DNS updates", HFILL}},
        { &hf_clientfqdn_o,
          { "O bit", "dhcpv6.clientfqdn.o", FT_BOOLEAN, 8, TFS(&fqdn_o), 0x2, "Whether the server has overridden the client's preference for the S bit.  Must be 0 when sent from client", HFILL}},
        { &hf_clientfqdn_s,
          { "S bit", "dhcpv6.clientfqdn.s", FT_BOOLEAN, 8, TFS(&fqdn_s), 0x1, "Whether the server SHOULD or SHOULD NOT perform the AAAA RR (FQDN-to-address) DNS updates", HFILL}},
        { &hf_remoteid_enterprise,
          { "Enterprise ID", "dhcpv6.remoteid.enterprise", FT_UINT32, BASE_ENTERPRISES, STRINGS_ENTERPRISES, 0, "RemoteID Enterprise Number", HFILL }},
        { &hf_duid_bytes,
          { "DUID", "dhcpv6.duid.bytes", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL}},
        { &hf_duid_type,
          { "DUID Type", "dhcpv6.duid.type", FT_UINT16, BASE_DEC, VALS(duidtype_vals), 0x0, NULL, HFILL}},
        { &hf_duidllt_time,
          { "DUID Time", "dhcpv6.duidllt.time", FT_ABSOLUTE_TIME, ABSOLUTE_TIME_LOCAL, NULL, 0x0, NULL, HFILL}},
        { &hf_duidllt_link_layer_addr,
          { "Link-layer address", "dhcpv6.duidllt.link_layer_addr", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL}},
        { &hf_duidllt_hwtype,
          { "Hardware type", "dhcpv6.duidllt.hwtype", FT_UINT16, BASE_DEC, VALS(arp_hrd_vals), 0, "DUID LLT Hardware Type", HFILL }},
        { &hf_duidll_hwtype,
          { "Hardware type", "dhcpv6.duidll.hwtype", FT_UINT16, BASE_DEC, VALS(arp_hrd_vals), 0, "DUID LL Hardware Type", HFILL }},
        { &hf_duiden_enterprise,
          { "Enterprise ID", "dhcpv6.duiden.enterprise", FT_UINT32, BASE_ENTERPRISES, STRINGS_ENTERPRISES, 0, "DUID EN Enterprise Number", HFILL }},
        { &hf_duiden_identifier,
          { "Identifier", "dhcpv6.duiden.identifier", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL}},
        { &hf_duidll_link_layer_addr,
          { "Link-layer address", "dhcpv6.duidll.link_layer_addr", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL}},
        { &hf_duiduuid_bytes,
          { "UUID", "dhcpv6.duiduuid.bytes", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
        { &hf_iaid,
          { "IAID", "dhcpv6.iaid", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL}},
        { &hf_iaid_t1,
          { "T1", "dhcpv6.iaid.t1", FT_UINT32, BASE_DEC, NULL, 0, NULL, HFILL}},
        { &hf_iaid_t2,
          { "T2", "dhcpv6.iaid.t2", FT_UINT32, BASE_DEC, NULL, 0, NULL, HFILL}},
        { &hf_iata,
          { "IATA", "dhcpv6.iata", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL}},
        { &hf_iaaddr_ip,
          { "IPv6 address", "dhcpv6.iaaddr.ip", FT_IPv6, BASE_NONE, NULL, 0x0, NULL, HFILL}},
        { &hf_iaaddr_pref_lifetime,
          { "Preferred lifetime", "dhcpv6.iaaddr.pref_lifetime", FT_UINT32, BASE_DEC, NULL, 0, NULL, HFILL}},
        { &hf_iaaddr_valid_lifetime,
          { "Valid lifetime", "dhcpv6.iaaddr.valid_lifetime", FT_UINT32, BASE_DEC, NULL, 0, NULL, HFILL}},
        { &hf_requested_option_code,
          { "Requested Option code", "dhcpv6.requested_option_code", FT_UINT16, BASE_DEC | BASE_EXT_STRING, &opttype_vals_ext, 0, NULL, HFILL }},
        { &hf_option_preference,
          { "Pref-value", "dhcpv6.option_preference", FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL}},
        { &hf_elapsed_time,
          { "Elapsed time", "dhcpv6.elapsed_time", FT_UINT16, BASE_DEC|BASE_UNIT_STRING, &units_milliseconds, 0, NULL, HFILL}},
        { &hf_auth_protocol,
          { "Protocol", "dhcpv6.auth.protocol", FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL}},
        { &hf_auth_algorithm,
          { "Algorithm", "dhcpv6.auth.algorithm", FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL}},
        { &hf_auth_rdm,
          { "RDM", "dhcpv6.auth.rdm", FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL}},
        { &hf_auth_replay_detection,
          { "Replay Detection", "dhcpv6.auth.replay_detection", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL}},
        { &hf_auth_info,
          { "Authentication Information", "dhcpv6.auth.info", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL}},
        { &hf_auth_realm,
          { "DHCP realm", "dhcpv6.auth.realm", FT_STRING, BASE_NONE, NULL, 0, NULL, HFILL }},
        { &hf_auth_key_id,
          {"Key ID", "dhcpv6.auth.key_id", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL}},
        { &hf_auth_md5_data,
          {"HMAC-MD5 data", "dhcpv6.auth.md5_data", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL}},
        { &hf_opt_unicast,
          { "IPv6 address", "dhcpv6.unicast", FT_IPv6, BASE_NONE, NULL, 0x0, NULL, HFILL}},
        { &hf_opt_status_code,
          { "Status Code", "dhcpv6.status_code", FT_UINT16, BASE_DEC | BASE_EXT_STRING, &statuscode_vals_ext, 0, NULL, HFILL }},
        { &hf_opt_status_msg,
          { "Status Message", "dhcpv6.status_msg", FT_STRING, BASE_NONE, NULL, 0, NULL, HFILL }},
        { &hf_vendorclass_enterprise,
          { "Enterprise ID", "dhcpv6.vendorclass.enterprise", FT_UINT32, BASE_ENTERPRISES, STRINGS_ENTERPRISES, 0, "Vendor Class Enterprise Number", HFILL }},
        { &hf_vendorclass_data,
          { "vendor-class-data", "dhcpv6.vendorclass.data", FT_STRINGZ, BASE_NONE, NULL, 0, NULL, HFILL }},
        { &hf_vendoropts_enterprise,
          { "Enterprise ID", "dhcpv6.vendoropts.enterprise", FT_UINT32, BASE_ENTERPRISES, STRINGS_ENTERPRISES, 0, "Vendor opts Enterprise Number", HFILL }},
        { &hf_vendoropts_enterprise_option_code,
          { "Option code", "dhcpv6.vendoropts.enterprise.option_code", FT_UINT16, BASE_DEC, NULL, 0, NULL, HFILL }},
        { &hf_vendoropts_enterprise_option_length,
          { "Option length", "dhcpv6.vendoropts.enterprise.option_length", FT_UINT16, BASE_DEC, NULL, 0, NULL, HFILL }},
        { &hf_vendoropts_enterprise_option_data,
          { "Option data", "dhcpv6.vendoropts.enterprise.option_data", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL}},
        { &hf_interface_id,
          { "Interface-ID", "dhcpv6.interface_id", FT_BYTES, BASE_NONE, NULL, 0, NULL, HFILL }},
        { &hf_reconf_msg,
          { "Reconfigure message type", "dhcpv6.reconf_msg", FT_UINT8, BASE_DEC | BASE_EXT_STRING, &msgtype_vals_ext, 0, NULL, HFILL }},
        { &hf_sip_server_domain_search_fqdn,
          { "SIP Server Domain Search FQDN", "dhcpv6.sip_server_domain_search_fqdn", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }},
        { &hf_sip_server_a,
          { "SIP server address", "dhcpv6.sip_server_a", FT_IPv6, BASE_NONE, NULL, 0x0, NULL, HFILL}},
        { &hf_dns_servers,
          { "DNS server address", "dhcpv6.dns_server", FT_IPv6, BASE_NONE, NULL, 0x0, NULL, HFILL}},
        { &hf_domain_search_list_fqdn,
          { "Domain Search List FQDN", "dhcpv6.domain_search_list_fqdn", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }},
        { &hf_nis_servers,
          { "NIS server address", "dhcpv6.nis_server", FT_IPv6, BASE_NONE, NULL, 0x0, NULL, HFILL}},
        { &hf_nisp_servers,
          { "NISP server address", "dhcpv6.nisp_server", FT_IPv6, BASE_NONE, NULL, 0x0, NULL, HFILL}},
        { &hf_nis_fqdn,
          { "NIS FQDN", "dhcpv6.nis_fqdn", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }},
        { &hf_nisp_fqdn,
          { "NISP FQDN", "dhcpv6.nisp_fqdn", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }},
        { &hf_sntp_servers,
          { "SNTP server address", "dhcpv6.sntp_server", FT_IPv6, BASE_NONE, NULL, 0x0, NULL, HFILL}},
        { &hf_opt_lifetime,
          { "Lifetime", "dhcpv6.lifetime", FT_UINT32, BASE_DEC, NULL, 0, NULL, HFILL}},
        { &hf_bcmcs_servers_fqdn,
          { "BCMCS server FQDN", "dhcpv6.bcmcs_server_fqdn", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }},
        { &hf_bcmcs_servers_a,
          { "BCMCS server address", "dhcpv6.bcmcs_server_a", FT_IPv6, BASE_NONE, NULL, 0x0, NULL, HFILL}},
        { &hf_remoteid_enterprise_id,
          { "Remote-ID", "dhcpv6.remoteid_enterprise_id", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL}},
        { &hf_subscriber_id,
          { "Subscriber-ID", "dhcpv6.subscriber_id", FT_STRING, BASE_NONE, NULL, 0, NULL, HFILL }},
        { &hf_client_fqdn,
          { "Client FQDN", "dhcpv6.client_fqdn", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }},
        { &hf_pana_agent,
          { "PANA agents address", "dhcpv6.pana_agent", FT_IPv6, BASE_NONE, NULL, 0x0, NULL, HFILL}},
        { &hf_opt_timezone,
          { "Time-zone", "dhcpv6.timezone", FT_STRING, BASE_NONE, NULL, 0, NULL, HFILL }},
        { &hf_opt_tzdb,
          { "TZ-database", "dhcpv6.tzdb", FT_STRING, BASE_NONE, NULL, 0, NULL, HFILL }},
        { &hf_lq_query,
          { "Query-type", "dhcpv6.lq_query", FT_UINT8, BASE_DEC, VALS(lq_query_vals), 0, NULL, HFILL }},
        { &hf_lq_query_link_address,
          { "Link address", "dhcpv6.lq_query_link_address", FT_IPv6, BASE_NONE, NULL, 0x0, NULL, HFILL}},
        { &hf_clt_time,
          { "Clt_time", "dhcpv6.clt_time", FT_UINT32, BASE_DEC, NULL, 0, NULL, HFILL}},
        { &hf_lq_relay_data_peer_addr,
          { "Peer address", "dhcpv6.lq_relay_data_peer_addr", FT_IPv6, BASE_NONE, NULL, 0x0, NULL, HFILL}},
        { &hf_lq_relay_data_msg,
          { "DHCPv6 relay message", "dhcpv6.lq_relay_data_msg", FT_STRING, BASE_NONE, NULL, 0, NULL, HFILL }},
        { &hf_lq_client_link,
          { "LQ client links address", "dhcpv6.lq_client_link", FT_IPv6, BASE_NONE, NULL, 0x0, NULL, HFILL}},
        { &hf_capwap_ac_v6,
          { "CAPWAP Access Controllers address", "dhcpv6.capwap_ac_v6", FT_IPv6, BASE_NONE, NULL, 0x0, NULL, HFILL}},
        { &hf_aftr_name,
          { "DS-Lite AFTR Name", "dhcpv6.aftr_name", FT_STRING, BASE_NONE, NULL, 0, NULL, HFILL }},
        { &hf_iaprefix_pref_lifetime,
          { "Preferred lifetime", "dhcpv6.iaprefix.pref_lifetime", FT_UINT32, BASE_DEC, NULL, 0, NULL, HFILL}},
        { &hf_iaprefix_valid_lifetime,
          { "Valid lifetime", "dhcpv6.iaprefix.valid_lifetime", FT_UINT32, BASE_DEC, NULL, 0, NULL, HFILL}},
        { &hf_iaprefix_pref_len,
          { "Prefix length", "dhcpv6.iaprefix.pref_len", FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL }},
        { &hf_iaprefix_pref_addr,
          { "Prefix address", "dhcpv6.iaprefix.pref_addr", FT_IPv6, BASE_NONE, NULL, 0x0, NULL, HFILL}},
        { &hf_mip6_ha,
          { "Home Agent", "dhcpv6.mip6_home_agent", FT_IPv6, BASE_NONE, NULL, 0x0, NULL, HFILL}},
        { &hf_mip6_hoa,
          { "Home Address", "dhcpv6.mip6_home_address", FT_IPv6, BASE_NONE, NULL, 0x0, NULL, HFILL}},
        { &hf_nai,
          { "NAI", "dhcpv6.nai", FT_STRING, BASE_NONE, NULL, 0, NULL, HFILL }},
        { &hf_pd_exclude_pref_len,
          { "Prefix length", "dhcpv6.pd_exclude.pref_len", FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL }},
        { &hf_pd_exclude_subnet_id,
          { "IPv6 subnet ID", "dhcpv6.pd_exclude.subnet_id", FT_BYTES, BASE_NONE, NULL, 0, NULL, HFILL }},
        { &hf_option_ntpserver_type,
          { "Suboption", "dhcpv6.ntpserver.option.type", FT_UINT16, BASE_DEC, VALS(ntp_server_opttype_vals), 0x0, NULL, HFILL}},
        { &hf_option_ntpserver_length,
          { "Length", "dhcpv6.ntpserver.option.length", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL}},
        { &hf_option_ntpserver_addr,
          { "NTP Server Address", "dhcpv6.ntpserver.addr", FT_IPv6, BASE_NONE, NULL, 0x0, NULL, HFILL}},
        { &hf_option_ntpserver_mc_addr,
          { "NTP Multicast Address", "dhcpv6.ntpserver.mc_addr", FT_IPv6, BASE_NONE, NULL, 0x0, NULL, HFILL}},
        { &hf_option_captive_portal,
          { "Captive Portal", "dhcpv6.captive_portal", FT_STRING, BASE_NONE, NULL, 0x0, "The contact URI for the captive portal that the user should connect to", HFILL }},
        { &hf_option_ntpserver_fqdn,
          { "NTP Server FQDN", "dhcpv6.ntpserver.fqdn", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }},
        { &hf_packetcable_ccc_suboption,
          { "Sub element", "dhcpv6.packetcable.ccc.suboption", FT_UINT16, BASE_DEC, VALS(pkt_ccc_opt_vals), 0, NULL, HFILL }},
        { &hf_packetcable_ccc_pri_dhcp,
          { "Primary DHCP", "dhcpv6.packetcable.ccc.pri_dhcp", FT_IPv4, BASE_NONE, NULL, 0, NULL, HFILL }},
        { &hf_packetcable_ccc_sec_dhcp,
          { "Secondary DHCP", "dhcpv6.packetcable.ccc.sec_dhcp", FT_IPv4, BASE_NONE, NULL, 0, NULL, HFILL }},
        { &hf_packetcable_cccV6_suboption,
          { "Sub element", "dhcpv6.packetcable.cccV6.suboption", FT_UINT16, BASE_DEC | BASE_EXT_STRING, &pkt_cccV6_opt_vals_ext, 0, NULL, HFILL }},
        { &hf_modem_capabilities_encoding_type,
          { "Type", "dhcpv6.docsis.cccV6.tlv5.suboption", FT_UINT16, BASE_DEC | BASE_EXT_STRING, &modem_capabilities_encoding_ext, 0, NULL, HFILL }},
        { &hf_eue_capabilities_encoding_type,
          { "Type", "dhcpv6.packetcable.cccV6.tlv5.suboption", FT_UINT16, BASE_DEC | BASE_EXT_STRING, &eue_capabilities_encoding_ext, 0, NULL, HFILL }},
        { &hf_capabilities_encoding_length,
          { "Length", "dhcpv6.cccV6.tlv5.suboption.length", FT_UINT16, BASE_DEC, NULL, 0, NULL, HFILL }},
        { &hf_capabilities_encoding_bytes,
          { "Value", "dhcpv6.cccV6.tlv5.suboption.value", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
        { &hf_capabilities_encoding_number,
          { "Value", "dhcpv6.cccV6.tlv5.suboption.value_number", FT_UINT16, BASE_DEC, NULL, 0, NULL, HFILL }},
        { &hf_packetcable_cccV6_pri_dss,
          { "Primary SSID", "dhcpv6.packetcable.cccV6.pri_dss", FT_STRINGZ, BASE_NONE, NULL, 0, NULL, HFILL }},
        { &hf_packetcable_cccV6_sec_dss,
          { "Secondary SSID", "dhcpv6.packetcable.cccV6.sec_dss", FT_STRINGZ, BASE_NONE, NULL, 0, NULL, HFILL }},
        { &hf_packetcable_cccV6_prov_srv_type,
          { "Type", "dhcpv6.packetcable.cccV6.prov_srv.type", FT_UINT8, BASE_DEC, VALS(pkt_cccV6_prov_srv_type_vals), 0, NULL, HFILL }},
        { &hf_packetcable_cccV6_prov_srv_fqdn,
          { "FQDN", "dhcpv6.packetcable.cccV6.prov_srv.fqdn", FT_STRING, BASE_NONE, NULL, 0, NULL, HFILL }},
        { &hf_packetcable_cccV6_prov_srv_ipv6,
          { "IPv6 address", "dhcpv6.packetcable.cccV6.prov_srv.ipv6", FT_IPv6, BASE_NONE, NULL, 0, NULL, HFILL }},
        { &hf_packetcable_cccV6_as_krb_nominal_timeout,
          { "Nominal Timeout", "dhcpv6.packetcable.cccV6.as_krb.nominal_timeout", FT_UINT32, BASE_DEC, NULL, 0, NULL, HFILL }},
        { &hf_packetcable_cccV6_as_krb_max_timeout,
          { "Maximum Timeout", "dhcpv6.packetcable.cccV6.as_krb.max_timeout", FT_UINT32, BASE_DEC, NULL, 0, NULL, HFILL }},
        { &hf_packetcable_cccV6_as_krb_max_retry_count,
          { "Maximum Retry Count", "dhcpv6.packetcable.cccV6.as_krb.max_retry_count", FT_UINT32, BASE_DEC, NULL, 0, NULL, HFILL }},
        { &hf_packetcable_cccV6_ap_krb_nominal_timeout,
          { "Nominal Timeout", "dhcpv6.packetcable.cccV6.ap_krb.nominal_timeout", FT_UINT32, BASE_DEC, NULL, 0, NULL, HFILL }},
        { &hf_packetcable_cccV6_ap_krb_max_timeout,
          { "Maximum Timeout", "dhcpv6.packetcable.cccV6.ap_krb.max_timeout", FT_UINT32, BASE_DEC, NULL, 0, NULL, HFILL }},
        { &hf_packetcable_cccV6_ap_krb_max_retry_count,
          { "Maximum Retry Count", "dhcpv6.packetcable.cccV6.ap_krb.max_retry_count", FT_UINT32, BASE_DEC, NULL, 0, NULL, HFILL }},
        { &hf_packetcable_cccV6_krb_realm,
          { "KRB Realm", "dhcpv6.packetcable.cccV6.krb_realm", FT_STRING, BASE_NONE, NULL, 0, NULL, HFILL }},
        { &hf_packetcable_cccV6_tgt_flag,
          { "TGT Flags", "dhcpv6.packetcable.cccV6.tgt_flag", FT_UINT8, BASE_HEX, NULL, 0, NULL, HFILL }},
        { &hf_packetcable_cccV6_tgt_flag_fetch,
          { "Fetch TGT", "dhcpv6.packetcable.cccV6.tgt_flag.fetch", FT_BOOLEAN, 8, TFS(&tfs_true_false), 0x01, NULL, HFILL }},
        { &hf_packetcable_cccV6_prov_timer,
          { "Provisioning timer", "dhcpv6.packetcable.cccV6.prov_timer", FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL }},
        { &hf_packetcable_cccV6_sec_tcm,
          { "SEC TCM Flags", "dhcpv6.packetcable.cccV6.sec_tcm", FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL }},
        { &hf_packetcable_cccV6_sec_tcm_provisioning_server,
          { "Provisioning Server", "dhcpv6.packetcable.cccV6.sec_tcm.provisioning_server", FT_BOOLEAN, 16, TFS(&tfs_on_off), 0x01, NULL, HFILL }},
        { &hf_packetcable_cccV6_sec_tcm_call_manager_server,
          { "Call Manager Servers", "dhcpv6.packetcable.cccV6.tgt_flag.call_manager_server", FT_BOOLEAN, 16, TFS(&tfs_on_off), 0x02, NULL, HFILL }},
        { &hf_cablelabs_opts,
          { "Suboption", "dhcpv6.cablelabs.opt", FT_UINT16, BASE_DEC | BASE_EXT_STRING, &cl_vendor_subopt_values_ext, 0, NULL, HFILL }},
        { &hf_cablelabs_ipv6_server,
          { "IPv6 address", "dhcpv6.cablelabs.ipv6_server", FT_IPv6, BASE_NONE, NULL, 0x0, NULL, HFILL}},
        { &hf_cablelabs_docsis_version_number,
          { "DOCSIS Version Number", "dhcpv6.cablelabs.docsis_version_number", FT_UINT16, BASE_CUSTOM, CF_FUNC(cablelabs_fmt_docsis_version), 0x0, NULL, HFILL}},
        { &hf_cablelabs_interface_id,
          { "Interface-ID", "dhcpv6.cablelabs.interface_id", FT_STRING, BASE_NONE, NULL, 0, NULL, HFILL }},
        { &hf_cablelabs_interface_id_link_address,
          { "Link Address", "dhcpv6.cablelabs.interface_id_link_address", FT_STRING, BASE_NONE, NULL, 0, NULL, HFILL }},
        { &hf_option_s46_rule_flags,
          { "Flags", "dhcpv6.s46_rule.flags", FT_UINT8, BASE_HEX, NULL, 0, NULL, HFILL }},
        { &hf_option_s46_rule_reserved_flag,
          { "Reserved", "dhcpv6.s46_rule.flags.reserved", FT_BOOLEAN, 8, TFS(&tfs_true_false), 0xfe, NULL, HFILL }},
        { &hf_option_s46_rule_fmr_flag,
          { "Forwarding Mapping Rule", "dhcpv6.s46_rule.flags.fmr", FT_BOOLEAN, 8, TFS(&tfs_true_false), 0x01, NULL, HFILL }},
        { &hf_option_s46_rule_ea_len,
          { "EA-bit length", "dhcpv6.s46_rule.ea_len", FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL }},
        { &hf_option_s46_rule_ipv4_pref_len,
          { "IPv4 prefix length", "dhcpv6.s46_rule.ipv4_pref_len", FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL }},
        { &hf_option_s46_rule_ipv4_prefix,
          { "IPv4 prefix", "dhcpv6.s46_rule.ipv4_prefix", FT_IPv4, BASE_NONE, NULL, 0, NULL, HFILL }},
        { &hf_option_s46_rule_ipv6_pref_len,
          { "IPv6 prefix length", "dhcpv6.s46_rule.ipv6_prefix_len", FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL }},
        { &hf_option_s46_rule_ipv6_prefix,
          { "IPv6 prefix", "dhcpv6.s46_rule.ipv6_prefix", FT_IPv6, BASE_NONE, NULL, 0, NULL, HFILL }},
        { &hf_option_s46_br_address,
          { "BR address", "dhcpv6.s46_br.address", FT_IPv6, BASE_NONE, NULL, 0, NULL, HFILL }},
        { &hf_option_s46_dmr_pref_len,
          { "IPv6 prefix length", "dhcpv6.s46_dmr.dmr_pref_len", FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL }},
        { &hf_option_s46_dmr_prefix,
          { "IPv6 prefix", "dhcpv6.s46_dmr.dmr_prefix", FT_IPv6, BASE_NONE, NULL, 0, NULL, HFILL }},
        { &hf_option_s46_v4v6bind_ipv4_address,
          { "IPv4 Address", "dhcpv6.s46_v4v6bind.ipv4_address", FT_IPv4, BASE_NONE, NULL, 0, NULL, HFILL }},
        { &hf_option_s46_v4v6bind_ipv6_pref_len,
          { "IPv6 prefix length", "dhcpv6.s46_v4v6bind.ipv6_pref_len", FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL }},
        { &hf_option_s46_v4v6bind_ipv6_prefix,
          { "IPv6 prefix", "dhcpv6.s46_v4v6bind.ipv6_prefix", FT_IPv6, BASE_NONE, NULL, 0, NULL, HFILL }},
        { &hf_option_s46_portparam_offset,
          { "Offset", "dhcpv6.s46_portparam.offset", FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL }},
        { &hf_option_s46_portparam_psid_len,
          { "PSID length", "dhcpv6.s46_portparam.psid_len", FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL }},
        { &hf_option_s46_portparam_psid,
          { "PSID", "dhcpv6.s46_portparam.psid", FT_UINT16, BASE_DEC, NULL, 0, NULL, HFILL }},
        { &hf_opt_mudurl,
          { "MUDURL", "dhcpv6.mudurl", FT_STRING, BASE_NONE, NULL, 0, NULL, HFILL }},
    };

    static gint *ett[] = {
        &ett_dhcpv6,
        &ett_dhcpv6_option,
        &ett_dhcpv6_option_vsoption,
        &ett_dhcpv6_vendor_option,
        &ett_dhcpv6_pkt_option,
        &ett_dhcpv6_netserver_option,
        &ett_dhcpv6_tlv5_type,
        &ett_dhcpv6_sip_server_domain_search_list_option,
        &ett_dhcpv6_dns_domain_search_list_option,
        &ett_dhcpv6_nis_domain_name_option,
        &ett_dhcpv6_nisp_domain_name_option,
        &ett_dhcpv6_bcmcs_servers_domain_search_list_option,
        &ett_dhcpv6_s46_rule_flags,
    };

    static ei_register_info ei[] = {
        { &ei_dhcpv6_bogus_length, { "dhcpv6.bogus_length", PI_MALFORMED, PI_ERROR, "Bogus length", EXPFILL }},
        { &ei_dhcpv6_malformed_option, { "dhcpv6.malformed_option", PI_MALFORMED, PI_ERROR, "Malformed option", EXPFILL }},
        { &ei_dhcpv6_no_suboption_len, { "dhcpv6.no_suboption_len", PI_PROTOCOL, PI_WARN, "no room left in option for suboption length", EXPFILL }},
        { &ei_dhcpv6_invalid_time_value, { "dhcpv6.invalid_time_value", PI_PROTOCOL, PI_WARN, "Invalid time value", EXPFILL }},
        { &ei_dhcpv6_invalid_type, { "dhcpv6.invalid_type", PI_PROTOCOL, PI_WARN, "Invalid type", EXPFILL }},
        { &ei_dhcpv6_malformed_dns, { "dhcpv6.malformed_dns", PI_PROTOCOL, PI_WARN, "Malformed DNS name record (MS Vista client?)", EXPFILL }},
        { &ei_dhcpv6_error_hopcount, { "dhcpv6.error_hopcount", PI_PROTOCOL, PI_WARN, "Detected error on hop-count", EXPFILL }},
    };

    static hf_register_info bulk_leasequery_hf[] = {
        { &hf_dhcpv6_bulk_leasequery_size,
          { "Message size", "dhcpv6.bulk_leasequery.size", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
        { &hf_dhcpv6_bulk_leasequery_msgtype,
          { "Message type", "dhcpv6.bulk_leasequery.msgtype", FT_UINT8, BASE_DEC | BASE_EXT_STRING, &msgtype_vals_ext, 0x0, NULL, HFILL }},
        { &hf_dhcpv6_bulk_leasequery_reserved,
          { "Reserved", "dhcpv6.bulk_leasequery.reserved", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
        { &hf_dhcpv6_bulk_leasequery_trans_id,
          { "Transaction ID", "dhcpv6.bulk_leasequery.trans_id", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
    };

    static gint *ett_bulk_leasequery[] = {
        &ett_dhcpv6_bulk_leasequery,
        &ett_dhcpv6_bulk_leasequery_options
    };

    static ei_register_info ei_bulk_leasequery[] = {
        { &ei_dhcpv6_bulk_leasequery_bad_query_type, { "dhcpv6.bulk_leasequery.bad_query_type", PI_MALFORMED, PI_WARN, "LQ-QUERY: Query types only supported by Bulk Leasequery", EXPFILL }},
        { &ei_dhcpv6_bulk_leasequery_bad_msg_type, { "dhcpv6.bulk_leasequery.bad_msg_type", PI_MALFORMED, PI_WARN, "Message Type %d not allowed by DHCPv6 Bulk Leasequery", EXPFILL }},
    };

    expert_module_t *expert_dhcpv6;
    expert_module_t *expert_dhcpv6_bulk_leasequery;

    proto_dhcpv6 = proto_register_protocol("DHCPv6", "DHCPv6", "dhcpv6");
    proto_register_field_array(proto_dhcpv6, hf, array_length(hf));
    proto_register_subtree_array(ett, array_length(ett));

    expert_dhcpv6 = expert_register_protocol(proto_dhcpv6);
    expert_register_field_array(expert_dhcpv6, ei, array_length(ei));

    proto_dhcpv6_bulk_leasequery = proto_register_protocol("DHCPv6 Bulk Leasequery", "DHCPv6 Bulk Leasequery", "dhcpv6.bulk_leasequery");
    proto_register_field_array(proto_dhcpv6_bulk_leasequery, bulk_leasequery_hf, array_length(bulk_leasequery_hf));
    proto_register_subtree_array(ett_bulk_leasequery, array_length(ett_bulk_leasequery));

    expert_dhcpv6_bulk_leasequery = expert_register_protocol(proto_dhcpv6_bulk_leasequery);
    expert_register_field_array(expert_dhcpv6_bulk_leasequery, ei_bulk_leasequery, array_length(ei_bulk_leasequery));

    /* Allow other dissectors to find this one by name. */
    dhcpv6_handle = register_dissector("dhcpv6", dissect_dhcpv6_stream, proto_dhcpv6);

    dhcpv6_module = prefs_register_protocol(proto_dhcpv6, NULL);
    prefs_register_bool_preference(dhcpv6_module, "cablelabs_interface_id",
                                    "Dissect Option 18 (Interface-Id) as CableLab option",
                                    "Whether Option 18 is dissected as CableLab or RFC 3315",
                                    &cablelabs_interface_id);

    bulkquery_module = prefs_register_protocol(proto_dhcpv6_bulk_leasequery, NULL);
    prefs_register_bool_preference(bulkquery_module, "desegment",
                                    "Desegment all Bulk Leasequery messages spanning multiple TCP segments",
                                    "Whether the Bulk Leasequery dissector should desegment all messages spanning multiple TCP segments",
                                    &dhcpv6_bulk_leasequery_desegment);
}

void
proto_reg_handoff_dhcpv6(void)
{
    dissector_handle_t dhcpv6_bulkquery_handle;

    dissector_add_uint_range_with_preference("udp.port", UDP_PORT_DHCPV6_RANGE, dhcpv6_handle);

    dhcpv6_bulkquery_handle = create_dissector_handle(dissect_dhcpv6_bulk_leasequery,
                                            proto_dhcpv6_bulk_leasequery);
    dissector_add_uint_with_preference("tcp.port", TCP_PORT_DHCPV6_UPSTREAM, dhcpv6_bulkquery_handle);
}

/*
 * Editor modelines
 *
 * Local Variables:
 * c-basic-offset: 4
 * tab-width: 8
 * indent-tabs-mode: nil
 * End:
 *
 * ex: set shiftwidth=4 tabstop=8 expandtab:
 * :indentSize=4:tabSize=8:noTabs=true:
 */
