xref: /src/external/bsd/tcpdump/dist/print-radius.c

/*
 * Copyright (C) 2000 Alfredo Andres Omella.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *   2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in
 *      the documentation and/or other materials provided with the
 *      distribution.
 *   3. The names of the authors may not be used to endorse or promote
 *      products derived from this software without specific prior
 *      written permission.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

/* \summary: Radius protocol printer */

/*
 * Radius printer routines as specified on:
 *
 * RFC 2865:
 *      "Remote Authentication Dial In User Service (RADIUS)"
 *
 * RFC 2866:
 *      "RADIUS Accounting"
 *
 * RFC 2867:
 *      "RADIUS Accounting Modifications for Tunnel Protocol Support"
 *
 * RFC 2868:
 *      "RADIUS Attributes for Tunnel Protocol Support"
 *
 * RFC 2869:
 *      "RADIUS Extensions"
 *
 * RFC 3162:
 *      "RADIUS and IPv6"
 *
 * RFC 3580:
 *      "IEEE 802.1X Remote Authentication Dial In User Service (RADIUS)"
 *      "Usage Guidelines"
 *
 * RFC 4072:
 *      "Diameter Extensible Authentication Protocol (EAP) Application"
 *
 * RFC 4675:
 *      "RADIUS Attributes for Virtual LAN and Priority Support"
 *
 * RFC 4818:
 *      "RADIUS Delegated-IPv6-Prefix Attribute"
 *
 * RFC 4849:
 *      "RADIUS Filter Rule Attribute"
 *
 * RFC 5090:
 *      "RADIUS Extension for Digest Authentication"
 *
 * RFC 5176:
 *      "Dynamic Authorization Extensions to RADIUS"
 *
 * RFC 5447:
 *      "Diameter Mobile IPv6"
 *
 * RFC 5580:
 *      "Carrying Location Objects in RADIUS and Diameter"
 *
 * RFC 6572:
 *      "RADIUS Support for Proxy Mobile IPv6"
 *
 * RFC 7155:
 *      "Diameter Network Access Server Application"
 *
 * Alfredo Andres Omella (aandres (at) s21sec.com) v0.1 2000/09/15
 *
 * TODO: Among other things to print ok MacIntosh and Vendor values
 */

#include <config.h>

#include "netdissect-stdinc.h"

#include <string.h>

#include "netdissect-ctype.h"

#include "netdissect.h"
#include "addrtoname.h"
#include "extract.h"
#include "oui.h"
#include "ntp.h"


#define TAM_SIZE(x) (sizeof(x)/sizeof(x[0]) )

#define PRINT_HEX(bytes_len, ptr_data)                               \
           while(bytes_len)                                          \
           {                                                         \
              ND_PRINT("%02X", GET_U_1(ptr_data));                   \
              ptr_data++;                                            \
              bytes_len--;                                           \
           }


/* Radius packet codes */
/* https://www.iana.org/assignments/radius-types/radius-types.xhtml#radius-types-27 */
#define RADCMD_ACCESS_REQ    1 /* Access-Request      */
#define RADCMD_ACCESS_ACC    2 /* Access-Accept       */
#define RADCMD_ACCESS_REJ    3 /* Access-Reject       */
#define RADCMD_ACCOUNT_REQ   4 /* Accounting-Request  */
#define RADCMD_ACCOUNT_RES   5 /* Accounting-Response */
#define RADCMD_ACCESS_CHA   11 /* Access-Challenge    */
#define RADCMD_STATUS_SER   12 /* Status-Server       */
#define RADCMD_STATUS_CLI   13 /* Status-Client       */
#define RADCMD_DISCON_REQ   40 /* Disconnect-Request  */
#define RADCMD_DISCON_ACK   41 /* Disconnect-ACK      */
#define RADCMD_DISCON_NAK   42 /* Disconnect-NAK      */
#define RADCMD_COA_REQ      43 /* CoA-Request         */
#define RADCMD_COA_ACK      44 /* CoA-ACK             */
#define RADCMD_COA_NAK      45 /* CoA-NAK             */
#define RADCMD_RESERVED    255 /* Reserved            */

static const struct tok radius_command_values[] = {
    { RADCMD_ACCESS_REQ,  "Access-Request" },
    { RADCMD_ACCESS_ACC,  "Access-Accept" },
    { RADCMD_ACCESS_REJ,  "Access-Reject" },
    { RADCMD_ACCOUNT_REQ, "Accounting-Request" },
    { RADCMD_ACCOUNT_RES, "Accounting-Response" },
    { RADCMD_ACCESS_CHA,  "Access-Challenge" },
    { RADCMD_STATUS_SER,  "Status-Server" },
    { RADCMD_STATUS_CLI,  "Status-Client" },
    { RADCMD_DISCON_REQ,  "Disconnect-Request" },
    { RADCMD_DISCON_ACK,  "Disconnect-ACK" },
    { RADCMD_DISCON_NAK,  "Disconnect-NAK" },
    { RADCMD_COA_REQ,     "CoA-Request" },
    { RADCMD_COA_ACK,     "CoA-ACK" },
    { RADCMD_COA_NAK,     "CoA-NAK" },
    { RADCMD_RESERVED,    "Reserved" },
    { 0, NULL}
};

/********************************/
/* Begin Radius Attribute types */
/********************************/
#define SERV_TYPE    6
#define FRM_IPADDR   8
#define LOG_IPHOST  14
#define LOG_SERVICE 15
#define FRM_IPX     23
#define SESSION_TIMEOUT   27
#define IDLE_TIMEOUT      28
#define FRM_ATALK_LINK    37
#define FRM_ATALK_NETWORK 38

#define ACCT_DELAY        41
#define ACCT_SESSION_TIME 46

#define EGRESS_VLAN_ID   56
#define EGRESS_VLAN_NAME 58

#define TUNNEL_TYPE        64
#define TUNNEL_MEDIUM      65
#define TUNNEL_CLIENT_END  66
#define TUNNEL_SERVER_END  67
#define TUNNEL_PASS        69

#define ARAP_PASS          70
#define ARAP_FEATURES      71

#define EAP_MESSAGE        79

#define TUNNEL_PRIV_GROUP  81
#define TUNNEL_ASSIGN_ID   82
#define TUNNEL_PREFERENCE  83

#define ARAP_CHALLENGE_RESP 84
#define ACCT_INT_INTERVAL   85

#define TUNNEL_CLIENT_AUTH 90
#define TUNNEL_SERVER_AUTH 91

#define ERROR_CAUSE 101
/********************************/
/* End Radius Attribute types */
/********************************/

#define RFC4675_TAGGED   0x31
#define RFC4675_UNTAGGED 0x32

static const struct tok rfc4675_tagged[] = {
    { RFC4675_TAGGED,   "Tagged" },
    { RFC4675_UNTAGGED, "Untagged" },
    { 0, NULL}
};


static void print_attr_string(netdissect_options *, const u_char *, u_int, u_short );
static void print_attr_num(netdissect_options *, const u_char *, u_int, u_short );
static void print_vendor_attr(netdissect_options *, const u_char *, u_int, u_short );
static void print_attr_address(netdissect_options *, const u_char *, u_int, u_short);
static void print_attr_address6(netdissect_options *, const u_char *, u_int, u_short);
static void print_attr_netmask6(netdissect_options *, const u_char *, u_int, u_short);
static void print_attr_mip6_home_link_prefix(netdissect_options *, const u_char *, u_int, u_short);
static void print_attr_operator_name(netdissect_options *, const u_char *, u_int, u_short);
static void print_attr_location_information(netdissect_options *, const u_char *, u_int, u_short);
static void print_attr_location_data(netdissect_options *, const u_char *, u_int, u_short);
static void print_basic_location_policy_rules(netdissect_options *, const u_char *, u_int, u_short);
static void print_attr_time(netdissect_options *, const u_char *, u_int, u_short);
static void print_attr_vector64(netdissect_options *, const u_char *, u_int, u_short);
static void print_attr_strange(netdissect_options *, const u_char *, u_int, u_short);


struct radius_hdr { nd_uint8_t  code;     /* Radius packet code  */
                    nd_uint8_t  id;       /* Radius packet id    */
                    nd_uint16_t len;      /* Radius total length */
                    nd_byte     auth[16]; /* Authenticator   */
                  };

#define MIN_RADIUS_LEN	20

struct radius_attr { nd_uint8_t type; /* Attribute type   */
                     nd_uint8_t len;  /* Attribute length */
                   };


/* Service-Type Attribute standard values */
/* https://www.iana.org/assignments/radius-types/radius-types.xhtml#radius-types-4 */
static const char *serv_type[]={ NULL,
                                "Login",
                                "Framed",
                                "Callback Login",
                                "Callback Framed",
                                "Outbound",
                                "Administrative",
                                "NAS Prompt",
                                "Authenticate Only",
                                "Callback NAS Prompt",
                                /* ^ [0, 9] ^ */
                                "Call Check",
                                "Callback Administrative",
                                "Voice",
                                "Fax",
                                "Modem Relay",
                                "IAPP-Register",
                                "IAPP-AP-Check",
                                "Authorize Only",
                                "Framed-Management",
                                "Additional-Authorization",
                                /* ^ [10, 19] ^ */
                               };

/* Framed-Protocol Attribute standard values */
/* https://www.iana.org/assignments/radius-types/radius-types.xhtml#radius-types-5 */
static const char *frm_proto[]={ NULL,
                                 "PPP",
                                 "SLIP",
                                 "ARAP",
                                 "Gandalf proprietary",
                                 "Xylogics IPX/SLIP",
                                 "X.75 Synchronous",
                                 "GPRS PDP Context",
                               };

/* Framed-Routing Attribute standard values */
/* https://www.iana.org/assignments/radius-types/radius-types.xhtml#radius-types-6 */
static const char *frm_routing[]={ "None",
                                   "Send",
                                   "Listen",
                                   "Send&Listen",
                                 };

/* Framed-Compression Attribute standard values */
/* https://www.iana.org/assignments/radius-types/radius-types.xhtml#radius-types-7 */
static const char *frm_comp[]={ "None",
                                "VJ TCP/IP",
                                "IPX",
                                "Stac-LZS",
                              };

/* Login-Service Attribute standard values */
/* https://www.iana.org/assignments/radius-types/radius-types.xhtml#radius-types-8 */
static const char *login_serv[]={ "Telnet",
                                  "Rlogin",
                                  "TCP Clear",
                                  "PortMaster(proprietary)",
                                  "LAT",
                                  "X.25-PAD",
                                  "X.25-T3POS",
                                  "Unassigned",
                                  "TCP Clear Quiet",
                                };


/* Termination-Action Attribute standard values */
/* https://www.iana.org/assignments/radius-types/radius-types.xhtml#radius-types-9 */
static const char *term_action[]={ "Default",
                                   "RADIUS-Request",
                                 };

/* Ingress-Filters Attribute standard values */
static const char *ingress_filters[]={ NULL,
                                       "Enabled",
                                       "Disabled",
                                     };

/* NAS-Port-Type Attribute standard values */
/* https://www.iana.org/assignments/radius-types/radius-types.xhtml#radius-types-13 */
static const char *nas_port_type[]={ "Async",
                                     "Sync",
                                     "ISDN Sync",
                                     "ISDN Async V.120",
                                     "ISDN Async V.110",
                                     "Virtual",
                                     "PIAFS",
                                     "HDLC Clear Channel",
                                     "X.25",
                                     "X.75",
                                     /* ^ [0, 9] ^ */
                                     "G.3 Fax",
                                     "SDSL",
                                     "ADSL-CAP",
                                     "ADSL-DMT",
                                     "ISDN-DSL",
                                     "Ethernet",
                                     "xDSL",
                                     "Cable",
                                     "Wireless - Other",
                                     "Wireless - IEEE 802.11",
                                     /* ^ [10, 19] ^ */
                                     "Token-Ring",
                                     "FDDI",
                                     "Wireless - CDMA200",
                                     "Wireless - UMTS",
                                     "Wireless - 1X-EV",
                                     "IAPP",
                                     "FTTP",
                                     "Wireless - IEEE 802.16",
                                     "Wireless - IEEE 802.20",
                                     "Wireless - IEEE 802.22",
                                     /* ^ [20, 29] ^ */
                                     "PPPoA",
                                     "PPPoEoA",
                                     "PPPoEoE",
                                     "PPPoEoVLAN",
                                     "PPPoEoQinQ",
                                     "xPON",
                                     "Wireless - XGP",
                                     "WiMAX Pre-Release 8 IWK Function",
                                     "WIMAX-WIFI-IWK",
                                     "WIMAX-SFF",
                                     /* ^ [30, 39] ^ */
                                     "WIMAX-HA-LMA",
                                     "WIMAX-DHCP",
                                     "WIMAX-LBS",
                                     "WIMAX-WVS",
                                   };

/* Acct-Status-Type Accounting Attribute standard values */
/* https://www.iana.org/assignments/radius-types/radius-types.xhtml#radius-types-10 */
static const char *acct_status[]={ NULL,
                                   "Start",
                                   "Stop",
                                   "Interim-Update",
                                   "Unassigned",
                                   "Unassigned",
                                   "Unassigned",
                                   "Accounting-On",
                                   "Accounting-Off",
                                   "Tunnel-Start",
                                     /* ^ [0, 9] ^ */
                                   "Tunnel-Stop",
                                   "Tunnel-Reject",
                                   "Tunnel-Link-Start",
                                   "Tunnel-Link-Stop",
                                   "Tunnel-Link-Reject",
                                   "Failed",
                                 };

/* Acct-Authentic Accounting Attribute standard values */
/* https://www.iana.org/assignments/radius-types/radius-types.xhtml#radius-types-11 */
static const char *acct_auth[]={ NULL,
                                 "RADIUS",
                                 "Local",
                                 "Remote",
                                 "Diameter",
                               };

/* Acct-Terminate-Cause Accounting Attribute standard values */
/* https://www.iana.org/assignments/radius-types/radius-types.xhtml#radius-types-12 */
static const char *acct_term[]={ NULL,
                                 "User Request",
                                 "Lost Carrier",
                                 "Lost Service",
                                 "Idle Timeout",
                                 "Session Timeout",
                                 "Admin Reset",
                                 "Admin Reboot",
                                 "Port Error",
                                 "NAS Error",
                                 /* ^ [0, 9] ^ */
                                 "NAS Request",
                                 "NAS Reboot",
                                 "Port Unneeded",
                                 "Port Preempted",
                                 "Port Suspended",
                                 "Service Unavailable",
                                 "Callback",
                                 "User Error",
                                 "Host Request",
                                 "Supplicant Restart",
                                 /* ^ [10, 19] ^ */
                                 "Reauthentication Failure",
                                 "Port Reinitialized",
                                 "Port Administratively Disabled",
                                 "Lost Power",
                               };

/* Tunnel-Type Attribute standard values */
/* https://www.iana.org/assignments/radius-types/radius-types.xhtml#radius-types-14 */
static const char *tunnel_type[]={ NULL,
                                   "PPTP",
                                   "L2F",
                                   "L2TP",
                                   "ATMP",
                                   "VTP",
                                   "AH",
                                   "IP-IP",
                                   "MIN-IP-IP",
                                   "ESP",
                                   /* ^ [0, 9] ^ */
                                   "GRE",
                                   "DVS",
                                   "IP-in-IP Tunneling",
                                   "VLAN",
                                 };

/* Tunnel-Medium-Type Attribute standard values */
/* https://www.iana.org/assignments/radius-types/radius-types.xhtml#radius-types-15 */
static const char *tunnel_medium[]={ NULL,
                                     "IPv4",
                                     "IPv6",
                                     "NSAP",
                                     "HDLC",
                                     "BBN 1822",
                                     "802",
                                     "E.163",
                                     "E.164",
                                     "F.69",
                                     /* ^ [0, 9] ^ */
                                     "X.121",
                                     "IPX",
                                     "Appletalk",
                                     "Decnet IV",
                                     "Banyan Vines",
                                     "E.164 with NSAP subaddress",
                                   };

/* ARAP-Zone-Access Attribute standard values */
/* https://www.iana.org/assignments/radius-types/radius-types.xhtml#radius-types-16 */
static const char *arap_zone[]={ NULL,
                                 "Only access to dfl zone",
                                 "Use zone filter inc.",
                                 "Not used",
                                 "Use zone filter exc.",
                               };

/* https://www.iana.org/assignments/radius-types/radius-types.xhtml#radius-types-17 */
static const char *prompt[]={ "No Echo",
                              "Echo",
                            };

/* Error-Cause standard values */
/* https://www.iana.org/assignments/radius-types/radius-types.xhtml#radius-types-18 */
#define ERROR_CAUSE_RESIDUAL_CONTEXT_REMOVED 201
#define ERROR_CAUSE_INVALID_EAP_PACKET 202
#define ERROR_CAUSE_UNSUPPORTED_ATTRIBUTE 401
#define ERROR_CAUSE_MISSING_ATTRIBUTE 402
#define ERROR_CAUSE_NAS_IDENTIFICATION_MISMATCH 403
#define ERROR_CAUSE_INVALID_REQUEST 404
#define ERROR_CAUSE_UNSUPPORTED_SERVICE 405
#define ERROR_CAUSE_UNSUPPORTED_EXTENSION 406
#define ERROR_CAUSE_INVALID_ATTRIBUTE_VALUE 407
#define ERROR_CAUSE_ADMINISTRATIVELY_PROHIBITED 501
#define ERROR_CAUSE_PROXY_REQUEST_NOT_ROUTABLE 502
#define ERROR_CAUSE_SESSION_CONTEXT_NOT_FOUND 503
#define ERROR_CAUSE_SESSION_CONTEXT_NOT_REMOVABLE 504
#define ERROR_CAUSE_PROXY_PROCESSING_ERROR 505
#define ERROR_CAUSE_RESOURCES_UNAVAILABLE 506
#define ERROR_CAUSE_REQUEST_INITIATED 507
#define ERROR_CAUSE_MULTIPLE_SESSION_SELECTION_UNSUPPORTED 508
#define ERROR_CAUSE_LOCATION_INFO_REQUIRED 509
static const struct tok errorcausetype[] = {
                                 { ERROR_CAUSE_RESIDUAL_CONTEXT_REMOVED,               "Residual Session Context Removed" },
                                 { ERROR_CAUSE_INVALID_EAP_PACKET,                     "Invalid EAP Packet (Ignored)" },
                                 { ERROR_CAUSE_UNSUPPORTED_ATTRIBUTE,                  "Unsupported Attribute" },
                                 { ERROR_CAUSE_MISSING_ATTRIBUTE,                      "Missing Attribute" },
                                 { ERROR_CAUSE_NAS_IDENTIFICATION_MISMATCH,            "NAS Identification Mismatch" },
                                 { ERROR_CAUSE_INVALID_REQUEST,                        "Invalid Request" },
                                 { ERROR_CAUSE_UNSUPPORTED_SERVICE,                    "Unsupported Service" },
                                 { ERROR_CAUSE_UNSUPPORTED_EXTENSION,                  "Unsupported Extension" },
                                 { ERROR_CAUSE_INVALID_ATTRIBUTE_VALUE,                "Invalid Attribute Value" },
                                 { ERROR_CAUSE_ADMINISTRATIVELY_PROHIBITED,            "Administratively Prohibited" },
                                 { ERROR_CAUSE_PROXY_REQUEST_NOT_ROUTABLE,             "Request Not Routable (Proxy)" },
                                 { ERROR_CAUSE_SESSION_CONTEXT_NOT_FOUND,              "Session Context Not Found" },
                                 { ERROR_CAUSE_SESSION_CONTEXT_NOT_REMOVABLE,          "Session Context Not Removable" },
                                 { ERROR_CAUSE_PROXY_PROCESSING_ERROR,                 "Other Proxy Processing Error" },
                                 { ERROR_CAUSE_RESOURCES_UNAVAILABLE,                  "Resources Unavailable" },
                                 { ERROR_CAUSE_REQUEST_INITIATED,                      "Request Initiated" },
                                 { ERROR_CAUSE_MULTIPLE_SESSION_SELECTION_UNSUPPORTED, "Multiple Session Selection Unsupported" },
                                 { ERROR_CAUSE_LOCATION_INFO_REQUIRED,                 "Location Info Required" },
																 { 0, NULL }
                               };

/* MIP6-Feature-Vector standard values */
/* https://www.iana.org/assignments/aaa-parameters/aaa-parameters.xhtml */
#define MIP6_INTEGRATED 0x0000000000000001
#define LOCAL_HOME_AGENT_ASSIGNMENT 0x0000000000000002
#define PMIP6_SUPPORTED 0x0000010000000000
#define IP4_HOA_SUPPORTED 0x0000020000000000
#define LOCAL_MAG_ROUTING_SUPPORTED 0x0000040000000000
#define ASSIGN_LOCAL_IP 0x0000080000000000
#define MIP4_SUPPORTED 0x0000100000000000
#define OPTIMIZED_IDLE_MODE_MOBILITY 0x0000200000000000
#define GTPv2_SUPPORTED 0x0000400000000000
#define IP4_TRANSPORT_SUPPORTED 0x0000800000000000
#define IP4_HOA_ONLY_SUPPORTED 0x0001000000000000
#define INTER_MAG_ROUTING_SUPPORTED 0x0002000000000000
static const struct mip6_feature_vector {
                  uint64_t v;
                  const char *s;
                } mip6_feature_vector[] = {
                                 { MIP6_INTEGRATED,             "MIP6_INTEGRATED" },
                                 { LOCAL_HOME_AGENT_ASSIGNMENT, "LOCAL_HOME_AGENT_ASSIGNMENT" },
                                 { PMIP6_SUPPORTED,             "PMIP6_SUPPORTED" },
                                 { IP4_HOA_SUPPORTED,           "IP4_HOA_SUPPORTED" },
                                 { LOCAL_MAG_ROUTING_SUPPORTED, "LOCAL_MAG_ROUTING_SUPPORTED" },
                                 { ASSIGN_LOCAL_IP,             "ASSIGN_LOCAL_IP" },
                                 { MIP4_SUPPORTED,              "MIP4_SUPPORTED" },
                                 { OPTIMIZED_IDLE_MODE_MOBILITY, "OPTIMIZED_IDLE_MODE_MOBILITY" },
                                 { GTPv2_SUPPORTED,             "GTPv2_SUPPORTED" },
                                 { IP4_TRANSPORT_SUPPORTED,     "IP4_TRANSPORT_SUPPORTED" },
                                 { IP4_HOA_ONLY_SUPPORTED,      "IP4_HOA_ONLY_SUPPORTED" },
                                 { INTER_MAG_ROUTING_SUPPORTED, "INTER_MAG_ROUTING_SUPPORTED" },
                               };

/* https://www.iana.org/assignments/radius-types/radius-types.xhtml#radius-types-19 */
#define OPERATOR_NAME_TADIG 0x30
#define OPERATOR_NAME_REALM 0x31
#define OPERATOR_NAME_E212  0x32
#define OPERATOR_NAME_ICC   0x33
static const struct tok operator_name_vector[] = {
                                 { OPERATOR_NAME_TADIG, "TADIG" },
                                 { OPERATOR_NAME_REALM, "REALM" },
                                 { OPERATOR_NAME_E212,  "E212"  },
                                 { OPERATOR_NAME_ICC,   "ICC"   },
                                 { 0, NULL }
                               };

/* https://www.iana.org/assignments/radius-types/radius-types.xhtml#radius-types-20 */
#define LOCATION_INFORMATION_CODE_CIVIC      0
#define LOCATION_INFORMATION_CODE_GEOSPATIAL 1
static const struct tok location_information_code_vector[] = {
                                 { LOCATION_INFORMATION_CODE_CIVIC     , "Civic"      },
                                 { LOCATION_INFORMATION_CODE_GEOSPATIAL, "Geospatial" },
                                 { 0, NULL }
                               };

/* https://www.iana.org/assignments/radius-types/radius-types.xhtml#radius-types-21 */
#define LOCATION_INFORMATION_ENTITY_USER   0
#define LOCATION_INFORMATION_ENTITY_RADIUS 1
static const struct tok location_information_entity_vector[] = {
                                 { LOCATION_INFORMATION_ENTITY_USER,   "User"   },
                                 { LOCATION_INFORMATION_ENTITY_RADIUS, "RADIUS" },
                                 { 0, NULL }
                               };

/* https://www.iana.org/assignments/radius-types/radius-types.xhtml#radius-types-22 */
static const struct tok blpr_bm[] = {
                                 { 0x0001, "MBZ-15" },
                                 { 0x0002, "MBZ-14" },
                                 { 0x0004, "MBZ-13" },
                                 { 0x0008, "MBZ-12" },
                                 { 0x0010, "MBZ-11" },
                                 { 0x0020, "MBZ-10" },
                                 { 0x0040, "MBZ-9" },
                                 { 0x0080, "MBZ-8" },
                                 { 0x0100, "MBZ-7" },
                                 { 0x0200, "MBZ-6" },
                                 { 0x0400, "MBZ-5" },
                                 { 0x0800, "MBZ-4" },
                                 { 0x1000, "MBZ-3" },
                                 { 0x2000, "MBZ-2" },
                                 { 0x4000, "MBZ-1" },
                                 { 0x8000, "Retransmission Allowed" },
                                 { 0, NULL }
                               };

/* https://www.iana.org/assignments/radius-types/radius-types.xhtml#radius-types-2 */
static const struct attrtype {
                  const char *name;      /* Attribute name                 */
                  const char **subtypes; /* Standard Values (if any)       */
                  u_char siz_subtypes;   /* Size of total standard values  */
                  u_char first_subtype;  /* First standard value is 0 or 1 */
                  void (*print_func)(netdissect_options *, const u_char *, u_int, u_short);
                } attr_type[]=
  {
     { NULL,                              NULL, 0, 0, NULL               },
     { "User-Name",                       NULL, 0, 0, print_attr_string  },
     { "User-Password",                   NULL, 0, 0, NULL               },
     { "CHAP-Password",                   NULL, 0, 0, NULL               },
     { "NAS-IP-Address",                  NULL, 0, 0, print_attr_address },
     { "NAS-Port",                        NULL, 0, 0, print_attr_num     },
     { "Service-Type",                    serv_type, TAM_SIZE(serv_type)-1, 1, print_attr_num },
     { "Framed-Protocol",                 frm_proto, TAM_SIZE(frm_proto)-1, 1, print_attr_num },
     { "Framed-IP-Address",               NULL, 0, 0, print_attr_address },
     { "Framed-IP-Netmask",               NULL, 0, 0, print_attr_address },
     /* ^ [0, 9] ^ */
     { "Framed-Routing",                  frm_routing, TAM_SIZE(frm_routing), 0, print_attr_num },
     { "Filter-Id",                       NULL, 0, 0, print_attr_string  },
     { "Framed-MTU",                      NULL, 0, 0, print_attr_num     },
     { "Framed-Compression",              frm_comp, TAM_SIZE(frm_comp),   0, print_attr_num },
     { "Login-IP-Host",                   NULL, 0, 0, print_attr_address },
     { "Login-Service",                   login_serv, TAM_SIZE(login_serv), 0, print_attr_num },
     { "Login-TCP-Port",                  NULL, 0, 0, print_attr_num     },
     { "Unassigned",                      NULL, 0, 0, NULL }, /*17*/
     { "Reply-Message",                   NULL, 0, 0, print_attr_string },
     { "Callback-Number",                 NULL, 0, 0, print_attr_string },
     /* ^ [10, 19] ^ */
     { "Callback-Id",                     NULL, 0, 0, print_attr_string },
     { "Unassigned",                      NULL, 0, 0, NULL }, /*21*/
     { "Framed-Route",                    NULL, 0, 0, print_attr_string },
     { "Framed-IPX-Network",              NULL, 0, 0, print_attr_num    },
     { "State",                           NULL, 0, 0, print_attr_string },
     { "Class",                           NULL, 0, 0, print_attr_string },
     { "Vendor-Specific",                 NULL, 0, 0, print_vendor_attr },
     { "Session-Timeout",                 NULL, 0, 0, print_attr_num    },
     { "Idle-Timeout",                    NULL, 0, 0, print_attr_num    },
     { "Termination-Action",              term_action, TAM_SIZE(term_action), 0, print_attr_num },
     /* ^ [20, 29] ^ */
     { "Called-Station-Id",               NULL, 0, 0, print_attr_string },
     { "Calling-Station-Id",              NULL, 0, 0, print_attr_string },
     { "NAS-Identifier",                  NULL, 0, 0, print_attr_string },
     { "Proxy-State",                     NULL, 0, 0, print_attr_string },
     { "Login-LAT-Service",               NULL, 0, 0, print_attr_string },
     { "Login-LAT-Node",                  NULL, 0, 0, print_attr_string },
     { "Login-LAT-Group",                 NULL, 0, 0, print_attr_string },
     { "Framed-AppleTalk-Link",           NULL, 0, 0, print_attr_num    },
     { "Framed-AppleTalk-Network",        NULL, 0, 0, print_attr_num    },
     { "Framed-AppleTalk-Zone",           NULL, 0, 0, print_attr_string },
     /* ^ [30, 39] ^ */
     { "Acct-Status-Type",                acct_status, TAM_SIZE(acct_status)-1, 1, print_attr_num },
     { "Acct-Delay-Time",                 NULL, 0, 0, print_attr_num    },
     { "Acct-Input-Octets",               NULL, 0, 0, print_attr_num    },
     { "Acct-Output-Octets",              NULL, 0, 0, print_attr_num    },
     { "Acct-Session-Id",                 NULL, 0, 0, print_attr_string },
     { "Acct-Authentic",                  acct_auth, TAM_SIZE(acct_auth)-1, 1, print_attr_num },
     { "Acct-Session-Time",               NULL, 0, 0, print_attr_num },
     { "Acct-Input-Packets",              NULL, 0, 0, print_attr_num },
     { "Acct-Output-Packets",             NULL, 0, 0, print_attr_num },
     { "Acct-Terminate-Cause",            acct_term, TAM_SIZE(acct_term)-1, 1, print_attr_num },
     /* ^ [40, 49] ^ */
     { "Acct-Multi-Session-Id",           NULL, 0, 0, print_attr_string },
     { "Acct-Link-Count",                 NULL, 0, 0, print_attr_num },
     { "Acct-Input-Gigawords",            NULL, 0, 0, print_attr_num },
     { "Acct-Output-Gigawords",           NULL, 0, 0, print_attr_num },
     { "Unassigned",                      NULL, 0, 0, NULL }, /*54*/
     { "Event-Timestamp",                 NULL, 0, 0, print_attr_time },
     { "Egress-VLANID",                   NULL, 0, 0, print_attr_num },
     { "Ingress-Filters",                 ingress_filters, TAM_SIZE(ingress_filters)-1, 1, print_attr_num },
     { "Egress-VLAN-Name",                NULL, 0, 0, print_attr_string },
     { "User-Priority-Table",             NULL, 0, 0, NULL },
     /* ^ [50, 59] ^ */
     { "CHAP-Challenge",                  NULL, 0, 0, print_attr_string },
     { "NAS-Port-Type",                   nas_port_type, TAM_SIZE(nas_port_type), 0, print_attr_num },
     { "Port-Limit",                      NULL, 0, 0, print_attr_num },
     { "Login-LAT-Port",                  NULL, 0, 0, print_attr_string }, /*63*/
     { "Tunnel-Type",                     tunnel_type, TAM_SIZE(tunnel_type)-1, 1, print_attr_num },
     { "Tunnel-Medium-Type",              tunnel_medium, TAM_SIZE(tunnel_medium)-1, 1, print_attr_num },
     { "Tunnel-Client-Endpoint",          NULL, 0, 0, print_attr_string },
     { "Tunnel-Server-Endpoint",          NULL, 0, 0, print_attr_string },
     { "Acct-Tunnel-Connection",          NULL, 0, 0, print_attr_string },
     { "Tunnel-Password",                 NULL, 0, 0, print_attr_string  },
     /* ^ [60, 69] ^ */
     { "ARAP-Password",                   NULL, 0, 0, print_attr_strange },
     { "ARAP-Features",                   NULL, 0, 0, print_attr_strange },
     { "ARAP-Zone-Access",                arap_zone, TAM_SIZE(arap_zone)-1, 1, print_attr_num }, /*72*/
     { "ARAP-Security",                   NULL, 0, 0, print_attr_string },
     { "ARAP-Security-Data",              NULL, 0, 0, print_attr_string },
     { "Password-Retry",                  NULL, 0, 0, print_attr_num    },
     { "Prompt",                          prompt, TAM_SIZE(prompt), 0, print_attr_num },
     { "Connect-Info",                    NULL, 0, 0, print_attr_string   },
     { "Configuration-Token",             NULL, 0, 0, print_attr_string   },
     { "EAP-Message",                     NULL, 0, 0, print_attr_string   },
     /* ^ [70, 79] ^ */
     { "Message-Authenticator",           NULL, 0, 0, print_attr_string }, /*80*/
     { "Tunnel-Private-Group-ID",         NULL, 0, 0, print_attr_string },
     { "Tunnel-Assignment-ID",            NULL, 0, 0, print_attr_string },
     { "Tunnel-Preference",               NULL, 0, 0, print_attr_num    },
     { "ARAP-Challenge-Response",         NULL, 0, 0, print_attr_strange },
     { "Acct-Interim-Interval",           NULL, 0, 0, print_attr_num     },
     { "Acct-Tunnel-Packets-Lost",        NULL, 0, 0, print_attr_num }, /*86*/
     { "NAS-Port-Id",                     NULL, 0, 0, print_attr_string },
     { "Framed-Pool",                     NULL, 0, 0, print_attr_string },
     { "CUI",                             NULL, 0, 0, print_attr_string },
     /* ^ [80, 89] ^ */
     { "Tunnel-Client-Auth-ID",           NULL, 0, 0, print_attr_string },
     { "Tunnel-Server-Auth-ID",           NULL, 0, 0, print_attr_string },
     { "NAS-Filter-Rule",                 NULL, 0, 0, print_attr_string },
     { "Unassigned",                      NULL, 0, 0, NULL },  /*93*/
     { "Originating-Line-Info",           NULL, 0, 0, NULL },
     { "NAS-IPv6-Address",                NULL, 0, 0, print_attr_address6 },
     { "Framed-Interface-ID",             NULL, 0, 0, NULL },
     { "Framed-IPv6-Prefix",              NULL, 0, 0, print_attr_netmask6 },
     { "Login-IPv6-Host",                 NULL, 0, 0, print_attr_address6 },
     { "Framed-IPv6-Route",               NULL, 0, 0, print_attr_string },
     /* ^ [90, 99] ^ */
     { "Framed-IPv6-Pool",                NULL, 0, 0, print_attr_string },
     { "Error-Cause",                     NULL, 0, 0, print_attr_strange },
     { "EAP-Key-Name",                    NULL, 0, 0, NULL },
     { "Digest-Response",                 NULL, 0, 0, print_attr_string },
     { "Digest-Realm",                    NULL, 0, 0, print_attr_string },
     { "Digest-Nonce",                    NULL, 0, 0, print_attr_string },
     { "Digest-Response-Auth",            NULL, 0, 0, print_attr_string },
     { "Digest-Nextnonce",                NULL, 0, 0, print_attr_string },
     { "Digest-Method",                   NULL, 0, 0, print_attr_string },
     { "Digest-URI",                      NULL, 0, 0, print_attr_string },
     /* ^ [100, 109] ^ */
     { "Digest-Qop",                      NULL, 0, 0, print_attr_string },
     { "Digest-Algorithm",                NULL, 0, 0, print_attr_string },
     { "Digest-Entity-Body-Hash",         NULL, 0, 0, print_attr_string },
     { "Digest-CNonce",                   NULL, 0, 0, print_attr_string },
     { "Digest-Nonce-Count",              NULL, 0, 0, print_attr_string },
     { "Digest-Username",                 NULL, 0, 0, print_attr_string },
     { "Digest-Opaque",                   NULL, 0, 0, print_attr_string },
     { "Digest-Auth-Param",               NULL, 0, 0, print_attr_string },
     { "Digest-AKA-Auts",                 NULL, 0, 0, print_attr_string },
     { "Digest-Domain",                   NULL, 0, 0, print_attr_string },
     /* ^ [110, 119] ^ */
     { "Digest-Stale",                    NULL, 0, 0, print_attr_string },
     { "Digest-HA1",                      NULL, 0, 0, print_attr_string },
     { "SIP-AOR",                         NULL, 0, 0, print_attr_string },
     { "Delegated-IPv6-Prefix",           NULL, 0, 0, print_attr_netmask6 },
     { "MIP6-Feature-Vector",             NULL, 0, 0, print_attr_vector64 },
     { "MIP6-Home-Link-Prefix",           NULL, 0, 0, print_attr_mip6_home_link_prefix },
     { "Operator-Name",                   NULL, 0, 0, print_attr_operator_name },
     { "Location-Information",            NULL, 0, 0, print_attr_location_information },
     { "Location-Data",                   NULL, 0, 0, print_attr_location_data },
     { "Basic-Location-Policy-Rules",     NULL, 0, 0, print_basic_location_policy_rules }
     /* ^ [120, 129] ^ */
  };


/*****************************/
/* Print an attribute string */
/* value pointed by 'data'   */
/* and 'length' size.        */
/*****************************/
/* Returns nothing.          */
/*****************************/
static void
print_attr_string(netdissect_options *ndo,
                  const u_char *data, u_int length, u_short attr_code)
{
   u_int i;

   ND_TCHECK_LEN(data, length);

   switch(attr_code) {
      case TUNNEL_PASS:
           if (length < 3)
              goto trunc;
           if (GET_U_1(data) && (GET_U_1(data) <= 0x1F))
              ND_PRINT("Tag[%u] ", GET_U_1(data));
           else
              ND_PRINT("Tag[Unused] ");
           data++;
           length--;
           ND_PRINT("Salt %u ", GET_BE_U_2(data));
           data+=2;
           length-=2;
        break;
      case TUNNEL_CLIENT_END:
      case TUNNEL_SERVER_END:
      case TUNNEL_PRIV_GROUP:
      case TUNNEL_ASSIGN_ID:
      case TUNNEL_CLIENT_AUTH:
      case TUNNEL_SERVER_AUTH:
           if (GET_U_1(data) <= 0x1F) {
              if (length < 1)
                 goto trunc;
              if (GET_U_1(data))
                ND_PRINT("Tag[%u] ", GET_U_1(data));
              else
                ND_PRINT("Tag[Unused] ");
              data++;
              length--;
           }
        break;
      case EGRESS_VLAN_NAME:
           if (length < 1)
              goto trunc;
           ND_PRINT("%s (0x%02x) ",
                  tok2str(rfc4675_tagged,"Unknown tag",GET_U_1(data)),
                  GET_U_1(data));
           data++;
           length--;
        break;
      case EAP_MESSAGE:
           if (length < 1)
              goto trunc;
           eap_print(ndo, data, length);
           return;
   }

   for (i=0; i < length && GET_U_1(data); i++, data++)
       ND_PRINT("%c", ND_ASCII_ISPRINT(GET_U_1(data)) ? GET_U_1(data) : '.');

   return;

   trunc:
      nd_print_trunc(ndo);
}

/*
 * print vendor specific attributes
 */
static void
print_vendor_attr(netdissect_options *ndo,
                  const u_char *data, u_int length, u_short attr_code _U_)
{
    u_int idx;
    u_int vendor_id;
    u_int vendor_type;
    u_int vendor_length;

    if (length < 4)
        goto trunc;
    vendor_id = GET_BE_U_4(data);
    data+=4;
    length-=4;

    ND_PRINT("Vendor: %s (%u)",
           tok2str(smi_values,"Unknown",vendor_id),
           vendor_id);

    while (length >= 2) {
        vendor_type = GET_U_1(data);
        vendor_length = GET_U_1(data + 1);

        if (vendor_length < 2) {
            ND_PRINT("\n\t    Vendor Attribute: %u, Length: %u (bogus, must be >= 2)",
                   vendor_type,
                   vendor_length);
            return;
        }
        if (vendor_length > length) {
            ND_PRINT("\n\t    Vendor Attribute: %u, Length: %u (bogus, goes past end of vendor-specific attribute)",
                   vendor_type,
                   vendor_length);
            return;
        }
        data+=2;
        vendor_length-=2;
        length-=2;
	ND_TCHECK_LEN(data, vendor_length);

        ND_PRINT("\n\t    Vendor Attribute: %u, Length: %u, Value: ",
               vendor_type,
               vendor_length);
        for (idx = 0; idx < vendor_length ; idx++, data++)
            ND_PRINT("%c", ND_ASCII_ISPRINT(GET_U_1(data)) ? GET_U_1(data) : '.');
        length-=vendor_length;
    }
    return;

   trunc:
     nd_print_trunc(ndo);
}

/******************************/
/* Print an attribute numeric */
/* value pointed by 'data'    */
/* and 'length' size.         */
/******************************/
/* Returns nothing.           */
/******************************/
static void
print_attr_num(netdissect_options *ndo,
               const u_char *data, u_int length, u_short attr_code)
{
   uint32_t timeout;

   if (length != 4) {
       ND_PRINT("ERROR: length %u != 4", length);
       return;
   }

                          /* This attribute has standard values */
   if (attr_type[attr_code].siz_subtypes) {
      static const char **table;
      uint32_t data_value;
      table = attr_type[attr_code].subtypes;

      if ( (attr_code == TUNNEL_TYPE) || (attr_code == TUNNEL_MEDIUM) ) {
         if (!GET_U_1(data))
            ND_PRINT("Tag[Unused] ");
         else
            ND_PRINT("Tag[%u] ", GET_U_1(data));
         data++;
         data_value = GET_BE_U_3(data);
      } else {
         data_value = GET_BE_U_4(data);
      }
      if ( data_value <= (uint32_t)(attr_type[attr_code].siz_subtypes - 1 +
            attr_type[attr_code].first_subtype) &&
	   data_value >= attr_type[attr_code].first_subtype )
         ND_PRINT("%s", table[data_value]);
      else
         ND_PRINT("#%u", data_value);
   } else {
      switch(attr_code) /* Be aware of special cases... */
      {
        case FRM_IPX:
             if (GET_BE_U_4(data) == 0xFFFFFFFE )
                ND_PRINT("NAS Select");
             else
                ND_PRINT("%u", GET_BE_U_4(data));
          break;

        case SESSION_TIMEOUT:
        case IDLE_TIMEOUT:
        case ACCT_DELAY:
        case ACCT_SESSION_TIME:
        case ACCT_INT_INTERVAL:
             timeout = GET_BE_U_4(data);
             if ( timeout < 60 )
                ND_PRINT("%02d secs", timeout);
             else {
                if ( timeout < 3600 )
                   ND_PRINT("%02d:%02d min",
                          timeout / 60, timeout % 60);
                else
                   ND_PRINT("%02d:%02d:%02d hours",
                          timeout / 3600, (timeout % 3600) / 60,
                          timeout % 60);
             }
          break;

        case FRM_ATALK_LINK:
             if (GET_BE_U_4(data))
                ND_PRINT("%u", GET_BE_U_4(data));
             else
                ND_PRINT("Unnumbered");
          break;

        case FRM_ATALK_NETWORK:
             if (GET_BE_U_4(data))
                ND_PRINT("%u", GET_BE_U_4(data));
             else
                ND_PRINT("NAS assigned");
          break;

        case TUNNEL_PREFERENCE:
            if (GET_U_1(data))
               ND_PRINT("Tag[%u] ", GET_U_1(data));
            else
               ND_PRINT("Tag[Unused] ");
            data++;
            ND_PRINT("%u", GET_BE_U_3(data));
          break;

        case EGRESS_VLAN_ID:
            ND_PRINT("%s (0x%02x) ",
                   tok2str(rfc4675_tagged,"Unknown tag",GET_U_1(data)),
                   GET_U_1(data));
            data++;
            ND_PRINT("%u", GET_BE_U_3(data));
          break;

        default:
             ND_PRINT("%u", GET_BE_U_4(data));
          break;

      } /* switch */

   } /* if-else */
}

/*****************************/
/* Print an attribute IPv4   */
/* address value pointed by  */
/* 'data' and 'length' size. */
/*****************************/
/* Returns nothing.          */
/*****************************/
static void
print_attr_address(netdissect_options *ndo,
                   const u_char *data, u_int length, u_short attr_code)
{
   if (length != 4) {
       ND_PRINT("ERROR: length %u != 4", length);
       return;
   }

   switch(attr_code) {
      case FRM_IPADDR:
      case LOG_IPHOST:
           if (GET_BE_U_4(data) == 0xFFFFFFFF )
              ND_PRINT("User Selected");
           else
              if (GET_BE_U_4(data) == 0xFFFFFFFE )
                 ND_PRINT("NAS Select");
              else
                 ND_PRINT("%s",GET_IPADDR_STRING(data));
      break;

      default:
          ND_PRINT("%s", GET_IPADDR_STRING(data));
      break;
   }
}

/*****************************/
/* Print an attribute IPv6   */
/* address value pointed by  */
/* 'data' and 'length' size. */
/*****************************/
/* Returns nothing.          */
/*****************************/
static void
print_attr_address6(netdissect_options *ndo,
                   const u_char *data, u_int length, u_short attr_code _U_)
{
   if (length != 16) {
       ND_PRINT("ERROR: length %u != 16", length);
       return;
   }

   ND_PRINT("%s", GET_IP6ADDR_STRING(data));
}

static void
print_attr_netmask6(netdissect_options *ndo,
                    const u_char *data, u_int length, u_short attr_code _U_)
{
   u_char data2[16];

   if (length < 2 || length > 18) {
       ND_PRINT("ERROR: length %u not in range (2..18)", length);
       return;
   }
   ND_TCHECK_LEN(data, length);
   if (GET_U_1(data + 1) > 128) {
      ND_PRINT("ERROR: netmask %u not in range (0..128)", GET_U_1(data + 1));
      return;
   }

   memset(data2, 0, sizeof(data2));
   if (length > 2)
      memcpy(data2, data+2, length-2);

   ND_PRINT("%s/%u", ip6addr_string(ndo, data2), GET_U_1(data + 1)); /* local buffer, not packet data; don't use GET_IP6ADDR_STRING() */

   if (GET_U_1(data + 1) > 8 * (length - 2))
      ND_PRINT(" (inconsistent prefix length)");

   return;

   trunc:
     nd_print_trunc(ndo);
}

static void
print_attr_mip6_home_link_prefix(netdissect_options *ndo,
                    const u_char *data, u_int length, u_short attr_code _U_)
{
   if (length != 17) {
      ND_PRINT("ERROR: length %u != 17", length);
      return;
   }
   ND_TCHECK_LEN(data, length);
   if (GET_U_1(data) > 128) {
      ND_PRINT("ERROR: netmask %u not in range (0..128)", GET_U_1(data));
      return;
   }

   ND_PRINT("%s/%u", GET_IP6ADDR_STRING(data + 1), GET_U_1(data));

   return;

   trunc:
     nd_print_trunc(ndo);
}

static void
print_attr_operator_name(netdissect_options *ndo,
                    const u_char *data, u_int length, u_short attr_code _U_)
{
   u_int namespace_value;

   ND_TCHECK_LEN(data, length);
   if (length < 2) {
      ND_PRINT("ERROR: length %u < 2", length);
      return;
   }
   namespace_value = GET_U_1(data);
   data++;
   ND_PRINT("[%s] ", tok2str(operator_name_vector, "unknown namespace %u", namespace_value));

   (void)nd_printn(ndo, data, length - 1, NULL);

   return;

   trunc:
      nd_print_trunc(ndo);
}

static void
print_attr_location_information(netdissect_options *ndo,
                    const u_char *data, u_int length, u_short attr_code _U_)
{
   uint16_t index;
   uint8_t code, entity;

   ND_TCHECK_LEN(data, length);
   if (length < 21) {
     ND_PRINT("ERROR: length %u < 21", length);
      return;
   }

   index = GET_BE_U_2(data);
   data += 2;

   code = GET_U_1(data);
   data++;

   entity = GET_U_1(data);
   data++;

   ND_PRINT("index %u, code %s, entity %s, ",
       index,
       tok2str(location_information_code_vector, "Unknown (%u)", code),
       tok2str(location_information_entity_vector, "Unknown (%u)", entity)
   );

   ND_PRINT("sighting time ");
   p_ntp_time(ndo, (const struct l_fixedpt *)data);
   ND_PRINT(", ");
   data += 8;

   ND_PRINT("time to live ");
   p_ntp_time(ndo, (const struct l_fixedpt *)data);
   ND_PRINT(", ");
   data += 8;

   ND_PRINT("method \"");
   (void)nd_printn(ndo, data, length - 20, NULL);
   ND_PRINT("\"");

   return;

   trunc:
      nd_print_trunc(ndo);
}

static void
print_attr_location_data(netdissect_options *ndo,
                    const u_char *data, u_int length, u_short attr_code _U_)
{
   uint16_t index;

   ND_TCHECK_LEN(data, length);
   if (length < 3) {
     ND_PRINT("ERROR: length %u < 3", length);
      return;
   }

   index = GET_BE_U_2(data);
   data += 2;
   ND_PRINT("index %u, location", index);

   /* The Location field of the String field of the Location-Data attribute
    * can have two completely different structures depending on the value of
    * the Code field of a Location-Info attribute, which supposedly precedes
    * the current attribute. Unfortunately, this choice of encoding makes it
    * non-trivial to decode the Location field without preserving some state
    * between the attributes.
    */
   hex_and_ascii_print(ndo, "\n\t    ", data, length - 2);

   return;

   trunc:
      nd_print_trunc(ndo);
}

static void
print_basic_location_policy_rules(netdissect_options *ndo,
                    const u_char *data, u_int length, u_short attr_code _U_)
{
   uint16_t flags;

   ND_TCHECK_LEN(data, length);
   if (length < 10) {
     ND_PRINT("ERROR: length %u < 10", length);
      return;
   }

   flags = GET_BE_U_2(data);
   data += 2;
   ND_PRINT("flags [%s], ", bittok2str(blpr_bm, "none", flags));

   ND_PRINT("retention expires ");
   p_ntp_time(ndo, (const struct l_fixedpt *)data);
   data += 8;

   if (length > 10) {
      ND_PRINT(", note well \"");
      (void)nd_printn(ndo, data, length - 10, NULL);
      ND_PRINT("\"");
   }

   return;

   trunc:
      nd_print_trunc(ndo);
}


/*************************************/
/* Print an attribute of 'secs since */
/* January 1, 1970 00:00 UTC' value  */
/* pointed by 'data' and 'length'    */
/* size.                             */
/*************************************/
/* Returns nothing.                  */
/*************************************/
static void
print_attr_time(netdissect_options *ndo,
                const u_char *data, u_int length, u_short attr_code _U_)
{
   time_t attr_time;
   char string[26];

   if (length != 4) {
       ND_PRINT("ERROR: length %u != 4", length);
       return;
   }

   attr_time = GET_BE_U_4(data);
   strlcpy(string, ctime(&attr_time), sizeof(string));
   /* Get rid of the newline */
   string[24] = '\0';
   ND_PRINT("%.24s", string);
}

static void
print_attr_vector64(netdissect_options *ndo,
		    const u_char *data, u_int length, u_short attr_code _U_)
{
   uint64_t data_value, i;
   const char *sep = "";

   if (length != 8) {
       ND_PRINT("ERROR: length %u != 8", length);
       return;
   }

   ND_PRINT("[");

   data_value = GET_BE_U_8(data);
   /* Print the 64-bit field in a format similar to bittok2str(), less
    * flagging any unknown bits. This way it should be easier to replace
    * the custom code with a library function later.
    */
   for (i = 0; i < TAM_SIZE(mip6_feature_vector); i++) {
       if (data_value & mip6_feature_vector[i].v) {
           ND_PRINT("%s%s", sep, mip6_feature_vector[i].s);
           sep = ", ";
       }
   }

   ND_PRINT("]");
}

/***********************************/
/* Print an attribute of 'strange' */
/* data format pointed by 'data'   */
/* and 'length' size.              */
/***********************************/
/* Returns nothing.                */
/***********************************/
static void
print_attr_strange(netdissect_options *ndo,
                   const u_char *data, u_int length, u_short attr_code)
{
   u_short len_data;
   u_int error_cause_value;

   switch(attr_code) {
      case ARAP_PASS:
           if (length != 16) {
               ND_PRINT("ERROR: length %u != 16", length);
               return;
           }
           ND_PRINT("User_challenge (");
           len_data = 8;
           PRINT_HEX(len_data, data);
           ND_PRINT(") User_resp(");
           len_data = 8;
           PRINT_HEX(len_data, data);
           ND_PRINT(")");
        break;

      case ARAP_FEATURES:
           if (length != 14) {
               ND_PRINT("ERROR: length %u != 14", length);
               return;
           }
           if (GET_U_1(data))
              ND_PRINT("User can change password");
           else
              ND_PRINT("User cannot change password");
           data++;
           ND_PRINT(", Min password length: %u", GET_U_1(data));
           data++;
           ND_PRINT(", created at: ");
           len_data = 4;
           PRINT_HEX(len_data, data);
           ND_PRINT(", expires in: ");
           len_data = 4;
           PRINT_HEX(len_data, data);
           ND_PRINT(", Current Time: ");
           len_data = 4;
           PRINT_HEX(len_data, data);
        break;

      case ARAP_CHALLENGE_RESP:
           if (length < 8) {
               ND_PRINT("ERROR: length %u != 8", length);
               return;
           }
           len_data = 8;
           PRINT_HEX(len_data, data);
        break;

      case ERROR_CAUSE:
           if (length != 4) {
               ND_PRINT("Error: length %u != 4", length);
               return;
           }

           error_cause_value = GET_BE_U_4(data);
           ND_PRINT("Error cause %u: %s", error_cause_value, tok2str(errorcausetype, "Error-Cause %u not known", error_cause_value));
        break;
   }
   return;
}

static void
radius_attrs_print(netdissect_options *ndo,
                   const u_char *attr, u_int length)
{
   const struct radius_attr *rad_attr = (const struct radius_attr *)attr;
   const char *attr_string;
   uint8_t type, len;

   while (length > 0) {
     if (length < 2)
        goto trunc;
     ND_TCHECK_SIZE(rad_attr);

     type = GET_U_1(rad_attr->type);
     len = GET_U_1(rad_attr->len);
     if (type != 0 && type < TAM_SIZE(attr_type))
	attr_string = attr_type[type].name;
     else
	attr_string = "Unknown";

     ND_PRINT("\n\t  %s Attribute (%u), length: %u",
               attr_string,
               type,
               len);
     if (len < 2) {
       ND_PRINT(" (bogus, must be >= 2)");
       return;
     }
     if (len > length) {
        ND_PRINT(" (bogus, goes past end of packet)");
        return;
     }
     ND_PRINT(", Value: ");

     if (type < TAM_SIZE(attr_type)) {
         if (len > 2) {
             if ( attr_type[type].print_func )
                 (*attr_type[type].print_func)(
                     ndo, ((const u_char *)(rad_attr+1)),
                     len - 2, type);
         }
     }
     /* do we also want to see a hex dump ? */
     if (ndo->ndo_vflag> 1)
         print_unknown_data(ndo, (const u_char *)rad_attr+2, "\n\t    ", (len)-2);

     length-=(len);
     rad_attr = (const struct radius_attr *)( ((const char *)(rad_attr))+len);
   }
   return;

trunc:
   nd_print_trunc(ndo);
}

void
radius_print(netdissect_options *ndo,
             const u_char *dat, u_int length)
{
   const struct radius_hdr *rad;
   u_int len, auth_idx;

   ndo->ndo_protocol = "radius";
   ND_TCHECK_LEN(dat, MIN_RADIUS_LEN);
   rad = (const struct radius_hdr *)dat;
   len = GET_BE_U_2(rad->len);

   if (len < MIN_RADIUS_LEN) {
	  nd_print_trunc(ndo);
	  return;
   }

   if (len > length)
	  len = length;

   if (ndo->ndo_vflag < 1) {
       ND_PRINT("RADIUS, %s (%u), id: 0x%02x length: %u",
              tok2str(radius_command_values,"Unknown Command",GET_U_1(rad->code)),
              GET_U_1(rad->code),
              GET_U_1(rad->id),
              len);
       return;
   } else {
       ND_PRINT("RADIUS, length: %u\n\t%s (%u), id: 0x%02x, Authenticator: ",
              len,
              tok2str(radius_command_values,"Unknown Command",GET_U_1(rad->code)),
              GET_U_1(rad->code),
              GET_U_1(rad->id));

       for(auth_idx=0; auth_idx < 16; auth_idx++)
            ND_PRINT("%02x", rad->auth[auth_idx]);
   }

   if (len > MIN_RADIUS_LEN)
      radius_attrs_print(ndo, dat + MIN_RADIUS_LEN, len - MIN_RADIUS_LEN);
   return;

trunc:
   nd_print_trunc(ndo);
}